Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.106
1.106 ! djm 1: /* $OpenBSD: sshkey.c,v 1.105 2020/04/08 00:05:59 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4: * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5: * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/types.h>
1.7 djm 29: #include <netinet/in.h>
1.1 djm 30:
1.12 djm 31: #ifdef WITH_OPENSSL
1.1 djm 32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
1.12 djm 35: #endif
1.1 djm 36:
37: #include "crypto_api.h"
38:
39: #include <errno.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <util.h>
1.13 deraadt 43: #include <limits.h>
1.7 djm 44: #include <resolv.h>
1.1 djm 45:
46: #include "ssh2.h"
47: #include "ssherr.h"
48: #include "misc.h"
49: #include "sshbuf.h"
50: #include "cipher.h"
51: #include "digest.h"
52: #define SSHKEY_INTERNAL
53: #include "sshkey.h"
1.11 djm 54: #include "match.h"
1.86 djm 55: #include "ssh-sk.h"
1.1 djm 56:
1.74 dtucker 57: #ifdef WITH_XMSS
58: #include "sshkey-xmss.h"
1.62 markus 59: #include "xmss_fast.h"
1.74 dtucker 60: #endif
1.62 markus 61:
1.1 djm 62: /* openssh private key file format */
63: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
64: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
65: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
66: #define MARK_END_LEN (sizeof(MARK_END) - 1)
67: #define KDFNAME "bcrypt"
68: #define AUTH_MAGIC "openssh-key-v1"
69: #define SALT_LEN 16
1.56 djm 70: #define DEFAULT_CIPHERNAME "aes256-ctr"
1.1 djm 71: #define DEFAULT_ROUNDS 16
72:
73: /* Version identification string for SSH v1 identity files. */
74: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
75:
1.76 djm 76: /*
77: * Constants relating to "shielding" support; protection of keys expected
78: * to remain in memory for long durations
79: */
80: #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024)
81: #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */
82: #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512
83:
84: int sshkey_private_serialize_opt(struct sshkey *key,
1.62 markus 85: struct sshbuf *buf, enum sshkey_serialize_rep);
1.14 djm 86: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 87: struct sshkey **keyp, int allow_cert);
88:
89: /* Supported key types */
90: struct keytype {
91: const char *name;
92: const char *shortname;
1.65 djm 93: const char *sigalg;
1.1 djm 94: int type;
95: int nid;
96: int cert;
1.28 markus 97: int sigonly;
1.1 djm 98: };
99: static const struct keytype keytypes[] = {
1.65 djm 100: { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 },
101: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL,
1.28 markus 102: KEY_ED25519_CERT, 0, 1, 0 },
1.90 markus 103: { "sk-ssh-ed25519@openssh.com", "ED25519-SK", NULL,
104: KEY_ED25519_SK, 0, 0, 0 },
105: { "sk-ssh-ed25519-cert-v01@openssh.com", "ED25519-SK-CERT", NULL,
106: KEY_ED25519_SK_CERT, 0, 1, 0 },
1.62 markus 107: #ifdef WITH_XMSS
1.65 djm 108: { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 },
109: { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL,
1.62 markus 110: KEY_XMSS_CERT, 0, 1, 0 },
111: #endif /* WITH_XMSS */
1.1 djm 112: #ifdef WITH_OPENSSL
1.65 djm 113: { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 },
114: { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 },
115: { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 },
116: { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 },
117: { "ecdsa-sha2-nistp256", "ECDSA", NULL,
118: KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
119: { "ecdsa-sha2-nistp384", "ECDSA", NULL,
120: KEY_ECDSA, NID_secp384r1, 0, 0 },
121: { "ecdsa-sha2-nistp521", "ECDSA", NULL,
122: KEY_ECDSA, NID_secp521r1, 0, 0 },
1.85 djm 123: { "sk-ecdsa-sha2-nistp256@openssh.com", "ECDSA-SK", NULL,
124: KEY_ECDSA_SK, NID_X9_62_prime256v1, 0, 0 },
1.65 djm 125: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL,
126: KEY_RSA_CERT, 0, 1, 0 },
127: { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 128: "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 129: { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 130: "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 131: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL,
132: KEY_DSA_CERT, 0, 1, 0 },
133: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 134: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.65 djm 135: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 136: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.65 djm 137: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL,
138: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.85 djm 139: { "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-SK-CERT", NULL,
140: KEY_ECDSA_SK_CERT, NID_X9_62_prime256v1, 1, 0 },
1.1 djm 141: #endif /* WITH_OPENSSL */
1.65 djm 142: { NULL, NULL, NULL, -1, -1, 0, 0 }
1.1 djm 143: };
144:
145: const char *
146: sshkey_type(const struct sshkey *k)
147: {
148: const struct keytype *kt;
149:
150: for (kt = keytypes; kt->type != -1; kt++) {
151: if (kt->type == k->type)
152: return kt->shortname;
153: }
154: return "unknown";
155: }
156:
157: static const char *
158: sshkey_ssh_name_from_type_nid(int type, int nid)
159: {
160: const struct keytype *kt;
161:
162: for (kt = keytypes; kt->type != -1; kt++) {
163: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
164: return kt->name;
165: }
166: return "ssh-unknown";
167: }
168:
169: int
170: sshkey_type_is_cert(int type)
171: {
172: const struct keytype *kt;
173:
174: for (kt = keytypes; kt->type != -1; kt++) {
175: if (kt->type == type)
176: return kt->cert;
177: }
178: return 0;
179: }
180:
181: const char *
182: sshkey_ssh_name(const struct sshkey *k)
183: {
184: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
185: }
186:
187: const char *
188: sshkey_ssh_name_plain(const struct sshkey *k)
189: {
190: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
191: k->ecdsa_nid);
192: }
193:
194: int
195: sshkey_type_from_name(const char *name)
196: {
197: const struct keytype *kt;
198:
199: for (kt = keytypes; kt->type != -1; kt++) {
200: /* Only allow shortname matches for plain key types */
201: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
202: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
203: return kt->type;
204: }
205: return KEY_UNSPEC;
206: }
207:
1.85 djm 208: static int
209: key_type_is_ecdsa_variant(int type)
210: {
211: switch (type) {
212: case KEY_ECDSA:
213: case KEY_ECDSA_CERT:
214: case KEY_ECDSA_SK:
215: case KEY_ECDSA_SK_CERT:
216: return 1;
217: }
218: return 0;
219: }
220:
1.1 djm 221: int
222: sshkey_ecdsa_nid_from_name(const char *name)
223: {
224: const struct keytype *kt;
225:
1.4 djm 226: for (kt = keytypes; kt->type != -1; kt++) {
1.85 djm 227: if (!key_type_is_ecdsa_variant(kt->type))
1.4 djm 228: continue;
229: if (kt->name != NULL && strcmp(name, kt->name) == 0)
230: return kt->nid;
231: }
1.1 djm 232: return -1;
233: }
234:
235: char *
1.45 djm 236: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 237: {
238: char *tmp, *ret = NULL;
239: size_t nlen, rlen = 0;
240: const struct keytype *kt;
241:
242: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 243: if (kt->name == NULL)
244: continue;
245: if (!include_sigonly && kt->sigonly)
1.1 djm 246: continue;
247: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
248: continue;
249: if (ret != NULL)
1.38 djm 250: ret[rlen++] = sep;
1.1 djm 251: nlen = strlen(kt->name);
252: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
253: free(ret);
254: return NULL;
255: }
256: ret = tmp;
257: memcpy(ret + rlen, kt->name, nlen + 1);
258: rlen += nlen;
259: }
260: return ret;
261: }
262:
263: int
1.11 djm 264: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 265: {
266: char *s, *cp, *p;
1.11 djm 267: const struct keytype *kt;
268: int type;
1.1 djm 269:
270: if (names == NULL || strcmp(names, "") == 0)
271: return 0;
272: if ((s = cp = strdup(names)) == NULL)
273: return 0;
274: for ((p = strsep(&cp, ",")); p && *p != '\0';
275: (p = strsep(&cp, ","))) {
1.11 djm 276: type = sshkey_type_from_name(p);
277: if (type == KEY_UNSPEC) {
278: if (allow_wildcard) {
279: /*
280: * Try matching key types against the string.
281: * If any has a positive or negative match then
282: * the component is accepted.
283: */
284: for (kt = keytypes; kt->type != -1; kt++) {
285: if (match_pattern_list(kt->name,
1.17 djm 286: p, 0) != 0)
1.11 djm 287: break;
288: }
289: if (kt->type != -1)
290: continue;
291: }
1.1 djm 292: free(s);
293: return 0;
294: }
295: }
296: free(s);
297: return 1;
298: }
299:
300: u_int
301: sshkey_size(const struct sshkey *k)
302: {
1.69 djm 303: #ifdef WITH_OPENSSL
304: const BIGNUM *rsa_n, *dsa_p;
305: #endif /* WITH_OPENSSL */
306:
1.1 djm 307: switch (k->type) {
308: #ifdef WITH_OPENSSL
309: case KEY_RSA:
310: case KEY_RSA_CERT:
1.69 djm 311: if (k->rsa == NULL)
312: return 0;
313: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
314: return BN_num_bits(rsa_n);
1.1 djm 315: case KEY_DSA:
316: case KEY_DSA_CERT:
1.69 djm 317: if (k->dsa == NULL)
318: return 0;
319: DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL);
320: return BN_num_bits(dsa_p);
1.1 djm 321: case KEY_ECDSA:
322: case KEY_ECDSA_CERT:
1.85 djm 323: case KEY_ECDSA_SK:
324: case KEY_ECDSA_SK_CERT:
1.1 djm 325: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
326: #endif /* WITH_OPENSSL */
327: case KEY_ED25519:
328: case KEY_ED25519_CERT:
1.90 markus 329: case KEY_ED25519_SK:
330: case KEY_ED25519_SK_CERT:
1.62 markus 331: case KEY_XMSS:
332: case KEY_XMSS_CERT:
1.1 djm 333: return 256; /* XXX */
334: }
335: return 0;
336: }
337:
338: static int
339: sshkey_type_is_valid_ca(int type)
340: {
341: switch (type) {
342: case KEY_RSA:
343: case KEY_DSA:
344: case KEY_ECDSA:
1.85 djm 345: case KEY_ECDSA_SK:
1.1 djm 346: case KEY_ED25519:
1.90 markus 347: case KEY_ED25519_SK:
1.62 markus 348: case KEY_XMSS:
1.1 djm 349: return 1;
350: default:
351: return 0;
352: }
353: }
354:
355: int
356: sshkey_is_cert(const struct sshkey *k)
357: {
358: if (k == NULL)
359: return 0;
360: return sshkey_type_is_cert(k->type);
361: }
362:
1.90 markus 363: int
364: sshkey_is_sk(const struct sshkey *k)
365: {
366: if (k == NULL)
367: return 0;
368: switch (sshkey_type_plain(k->type)) {
369: case KEY_ECDSA_SK:
370: case KEY_ED25519_SK:
371: return 1;
372: default:
373: return 0;
374: }
375: }
376:
1.1 djm 377: /* Return the cert-less equivalent to a certified key type */
378: int
379: sshkey_type_plain(int type)
380: {
381: switch (type) {
382: case KEY_RSA_CERT:
383: return KEY_RSA;
384: case KEY_DSA_CERT:
385: return KEY_DSA;
386: case KEY_ECDSA_CERT:
387: return KEY_ECDSA;
1.85 djm 388: case KEY_ECDSA_SK_CERT:
389: return KEY_ECDSA_SK;
1.1 djm 390: case KEY_ED25519_CERT:
391: return KEY_ED25519;
1.90 markus 392: case KEY_ED25519_SK_CERT:
393: return KEY_ED25519_SK;
1.62 markus 394: case KEY_XMSS_CERT:
395: return KEY_XMSS;
1.1 djm 396: default:
397: return type;
398: }
399: }
400:
401: #ifdef WITH_OPENSSL
402: /* XXX: these are really begging for a table-driven approach */
403: int
404: sshkey_curve_name_to_nid(const char *name)
405: {
406: if (strcmp(name, "nistp256") == 0)
407: return NID_X9_62_prime256v1;
408: else if (strcmp(name, "nistp384") == 0)
409: return NID_secp384r1;
410: else if (strcmp(name, "nistp521") == 0)
411: return NID_secp521r1;
412: else
413: return -1;
414: }
415:
416: u_int
417: sshkey_curve_nid_to_bits(int nid)
418: {
419: switch (nid) {
420: case NID_X9_62_prime256v1:
421: return 256;
422: case NID_secp384r1:
423: return 384;
424: case NID_secp521r1:
425: return 521;
426: default:
427: return 0;
428: }
429: }
430:
431: int
432: sshkey_ecdsa_bits_to_nid(int bits)
433: {
434: switch (bits) {
435: case 256:
436: return NID_X9_62_prime256v1;
437: case 384:
438: return NID_secp384r1;
439: case 521:
440: return NID_secp521r1;
441: default:
442: return -1;
443: }
444: }
445:
446: const char *
447: sshkey_curve_nid_to_name(int nid)
448: {
449: switch (nid) {
450: case NID_X9_62_prime256v1:
451: return "nistp256";
452: case NID_secp384r1:
453: return "nistp384";
454: case NID_secp521r1:
455: return "nistp521";
456: default:
457: return NULL;
458: }
459: }
460:
461: int
462: sshkey_ec_nid_to_hash_alg(int nid)
463: {
464: int kbits = sshkey_curve_nid_to_bits(nid);
465:
466: if (kbits <= 0)
467: return -1;
468:
469: /* RFC5656 section 6.2.1 */
470: if (kbits <= 256)
471: return SSH_DIGEST_SHA256;
472: else if (kbits <= 384)
473: return SSH_DIGEST_SHA384;
474: else
475: return SSH_DIGEST_SHA512;
476: }
477: #endif /* WITH_OPENSSL */
478:
479: static void
480: cert_free(struct sshkey_cert *cert)
481: {
482: u_int i;
483:
484: if (cert == NULL)
485: return;
1.31 mmcc 486: sshbuf_free(cert->certblob);
487: sshbuf_free(cert->critical);
488: sshbuf_free(cert->extensions);
1.29 mmcc 489: free(cert->key_id);
1.1 djm 490: for (i = 0; i < cert->nprincipals; i++)
491: free(cert->principals[i]);
1.29 mmcc 492: free(cert->principals);
1.30 mmcc 493: sshkey_free(cert->signature_key);
1.67 djm 494: free(cert->signature_type);
1.61 jsing 495: freezero(cert, sizeof(*cert));
1.1 djm 496: }
497:
498: static struct sshkey_cert *
499: cert_new(void)
500: {
501: struct sshkey_cert *cert;
502:
503: if ((cert = calloc(1, sizeof(*cert))) == NULL)
504: return NULL;
505: if ((cert->certblob = sshbuf_new()) == NULL ||
506: (cert->critical = sshbuf_new()) == NULL ||
507: (cert->extensions = sshbuf_new()) == NULL) {
508: cert_free(cert);
509: return NULL;
510: }
511: cert->key_id = NULL;
512: cert->principals = NULL;
513: cert->signature_key = NULL;
1.67 djm 514: cert->signature_type = NULL;
1.1 djm 515: return cert;
516: }
517:
518: struct sshkey *
519: sshkey_new(int type)
520: {
521: struct sshkey *k;
522: #ifdef WITH_OPENSSL
523: RSA *rsa;
524: DSA *dsa;
525: #endif /* WITH_OPENSSL */
526:
527: if ((k = calloc(1, sizeof(*k))) == NULL)
528: return NULL;
529: k->type = type;
530: k->ecdsa = NULL;
531: k->ecdsa_nid = -1;
532: k->dsa = NULL;
533: k->rsa = NULL;
534: k->cert = NULL;
535: k->ed25519_sk = NULL;
536: k->ed25519_pk = NULL;
1.62 markus 537: k->xmss_sk = NULL;
538: k->xmss_pk = NULL;
1.1 djm 539: switch (k->type) {
540: #ifdef WITH_OPENSSL
541: case KEY_RSA:
542: case KEY_RSA_CERT:
1.69 djm 543: if ((rsa = RSA_new()) == NULL) {
1.1 djm 544: free(k);
545: return NULL;
546: }
547: k->rsa = rsa;
548: break;
549: case KEY_DSA:
550: case KEY_DSA_CERT:
1.69 djm 551: if ((dsa = DSA_new()) == NULL) {
1.1 djm 552: free(k);
553: return NULL;
554: }
555: k->dsa = dsa;
556: break;
557: case KEY_ECDSA:
558: case KEY_ECDSA_CERT:
1.85 djm 559: case KEY_ECDSA_SK:
560: case KEY_ECDSA_SK_CERT:
1.1 djm 561: /* Cannot do anything until we know the group */
562: break;
563: #endif /* WITH_OPENSSL */
564: case KEY_ED25519:
565: case KEY_ED25519_CERT:
1.90 markus 566: case KEY_ED25519_SK:
567: case KEY_ED25519_SK_CERT:
1.62 markus 568: case KEY_XMSS:
569: case KEY_XMSS_CERT:
1.1 djm 570: /* no need to prealloc */
571: break;
572: case KEY_UNSPEC:
573: break;
574: default:
575: free(k);
576: return NULL;
577: }
578:
579: if (sshkey_is_cert(k)) {
580: if ((k->cert = cert_new()) == NULL) {
581: sshkey_free(k);
582: return NULL;
583: }
584: }
585:
586: return k;
587: }
588:
589: void
590: sshkey_free(struct sshkey *k)
591: {
592: if (k == NULL)
593: return;
594: switch (k->type) {
595: #ifdef WITH_OPENSSL
596: case KEY_RSA:
597: case KEY_RSA_CERT:
1.60 jsing 598: RSA_free(k->rsa);
1.1 djm 599: k->rsa = NULL;
600: break;
601: case KEY_DSA:
602: case KEY_DSA_CERT:
1.60 jsing 603: DSA_free(k->dsa);
1.1 djm 604: k->dsa = NULL;
605: break;
1.85 djm 606: case KEY_ECDSA_SK:
607: case KEY_ECDSA_SK_CERT:
608: free(k->sk_application);
609: sshbuf_free(k->sk_key_handle);
610: sshbuf_free(k->sk_reserved);
611: /* FALLTHROUGH */
1.1 djm 612: case KEY_ECDSA:
613: case KEY_ECDSA_CERT:
1.60 jsing 614: EC_KEY_free(k->ecdsa);
1.1 djm 615: k->ecdsa = NULL;
616: break;
617: #endif /* WITH_OPENSSL */
1.90 markus 618: case KEY_ED25519_SK:
619: case KEY_ED25519_SK_CERT:
620: free(k->sk_application);
621: sshbuf_free(k->sk_key_handle);
622: sshbuf_free(k->sk_reserved);
623: /* FALLTHROUGH */
1.1 djm 624: case KEY_ED25519:
625: case KEY_ED25519_CERT:
1.61 jsing 626: freezero(k->ed25519_pk, ED25519_PK_SZ);
627: k->ed25519_pk = NULL;
628: freezero(k->ed25519_sk, ED25519_SK_SZ);
629: k->ed25519_sk = NULL;
1.1 djm 630: break;
1.62 markus 631: #ifdef WITH_XMSS
632: case KEY_XMSS:
633: case KEY_XMSS_CERT:
634: freezero(k->xmss_pk, sshkey_xmss_pklen(k));
635: k->xmss_pk = NULL;
636: freezero(k->xmss_sk, sshkey_xmss_sklen(k));
637: k->xmss_sk = NULL;
638: sshkey_xmss_free_state(k);
639: free(k->xmss_name);
640: k->xmss_name = NULL;
641: free(k->xmss_filename);
642: k->xmss_filename = NULL;
643: break;
644: #endif /* WITH_XMSS */
1.1 djm 645: case KEY_UNSPEC:
646: break;
647: default:
648: break;
649: }
650: if (sshkey_is_cert(k))
651: cert_free(k->cert);
1.76 djm 652: freezero(k->shielded_private, k->shielded_len);
653: freezero(k->shield_prekey, k->shield_prekey_len);
1.61 jsing 654: freezero(k, sizeof(*k));
1.1 djm 655: }
656:
657: static int
658: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
659: {
660: if (a == NULL && b == NULL)
661: return 1;
662: if (a == NULL || b == NULL)
663: return 0;
664: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
665: return 0;
666: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
667: sshbuf_len(a->certblob)) != 0)
668: return 0;
669: return 1;
670: }
671:
672: /*
673: * Compare public portions of key only, allowing comparisons between
674: * certificates and plain keys too.
675: */
676: int
677: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
678: {
679: #ifdef WITH_OPENSSL
1.69 djm 680: const BIGNUM *rsa_e_a, *rsa_n_a;
681: const BIGNUM *rsa_e_b, *rsa_n_b;
682: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
683: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 684: #endif /* WITH_OPENSSL */
685:
686: if (a == NULL || b == NULL ||
687: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
688: return 0;
689:
690: switch (a->type) {
691: #ifdef WITH_OPENSSL
692: case KEY_RSA_CERT:
693: case KEY_RSA:
1.69 djm 694: if (a->rsa == NULL || b->rsa == NULL)
695: return 0;
696: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
697: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
698: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
699: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 700: case KEY_DSA_CERT:
701: case KEY_DSA:
1.69 djm 702: if (a->dsa == NULL || b->dsa == NULL)
703: return 0;
704: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
705: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
706: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
707: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
708: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
709: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
710: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
711: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.85 djm 712: case KEY_ECDSA_SK:
713: case KEY_ECDSA_SK_CERT:
714: if (a->sk_application == NULL || b->sk_application == NULL)
715: return 0;
716: if (strcmp(a->sk_application, b->sk_application) != 0)
717: return 0;
718: /* FALLTHROUGH */
1.1 djm 719: case KEY_ECDSA_CERT:
720: case KEY_ECDSA:
721: if (a->ecdsa == NULL || b->ecdsa == NULL ||
722: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
723: EC_KEY_get0_public_key(b->ecdsa) == NULL)
724: return 0;
725: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
1.93 djm 726: EC_KEY_get0_group(b->ecdsa), NULL) != 0 ||
1.1 djm 727: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
728: EC_KEY_get0_public_key(a->ecdsa),
1.93 djm 729: EC_KEY_get0_public_key(b->ecdsa), NULL) != 0)
1.1 djm 730: return 0;
731: return 1;
732: #endif /* WITH_OPENSSL */
1.90 markus 733: case KEY_ED25519_SK:
734: case KEY_ED25519_SK_CERT:
735: if (a->sk_application == NULL || b->sk_application == NULL)
736: return 0;
737: if (strcmp(a->sk_application, b->sk_application) != 0)
738: return 0;
739: /* FALLTHROUGH */
1.1 djm 740: case KEY_ED25519:
741: case KEY_ED25519_CERT:
742: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
743: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 744: #ifdef WITH_XMSS
745: case KEY_XMSS:
746: case KEY_XMSS_CERT:
747: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
748: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
749: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
750: #endif /* WITH_XMSS */
1.1 djm 751: default:
752: return 0;
753: }
754: /* NOTREACHED */
755: }
756:
757: int
758: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
759: {
760: if (a == NULL || b == NULL || a->type != b->type)
761: return 0;
762: if (sshkey_is_cert(a)) {
763: if (!cert_compare(a->cert, b->cert))
764: return 0;
765: }
766: return sshkey_equal_public(a, b);
767: }
768:
769: static int
1.62 markus 770: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
771: enum sshkey_serialize_rep opts)
1.1 djm 772: {
773: int type, ret = SSH_ERR_INTERNAL_ERROR;
774: const char *typename;
1.69 djm 775: #ifdef WITH_OPENSSL
776: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
777: #endif /* WITH_OPENSSL */
1.1 djm 778:
779: if (key == NULL)
780: return SSH_ERR_INVALID_ARGUMENT;
781:
1.19 djm 782: if (sshkey_is_cert(key)) {
783: if (key->cert == NULL)
784: return SSH_ERR_EXPECTED_CERT;
785: if (sshbuf_len(key->cert->certblob) == 0)
786: return SSH_ERR_KEY_LACKS_CERTBLOB;
787: }
1.1 djm 788: type = force_plain ? sshkey_type_plain(key->type) : key->type;
789: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
790:
791: switch (type) {
792: #ifdef WITH_OPENSSL
793: case KEY_DSA_CERT:
794: case KEY_ECDSA_CERT:
1.85 djm 795: case KEY_ECDSA_SK_CERT:
1.1 djm 796: case KEY_RSA_CERT:
797: #endif /* WITH_OPENSSL */
798: case KEY_ED25519_CERT:
1.95 djm 799: case KEY_ED25519_SK_CERT:
1.62 markus 800: #ifdef WITH_XMSS
801: case KEY_XMSS_CERT:
802: #endif /* WITH_XMSS */
1.1 djm 803: /* Use the existing blob */
804: /* XXX modified flag? */
805: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
806: return ret;
807: break;
808: #ifdef WITH_OPENSSL
809: case KEY_DSA:
810: if (key->dsa == NULL)
811: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 812: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
813: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 814: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 815: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
816: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
817: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
818: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 819: return ret;
820: break;
821: case KEY_ECDSA:
1.85 djm 822: case KEY_ECDSA_SK:
1.1 djm 823: if (key->ecdsa == NULL)
824: return SSH_ERR_INVALID_ARGUMENT;
825: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
826: (ret = sshbuf_put_cstring(b,
827: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
828: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
829: return ret;
1.85 djm 830: if (type == KEY_ECDSA_SK) {
831: if ((ret = sshbuf_put_cstring(b,
832: key->sk_application)) != 0)
833: return ret;
834: }
1.1 djm 835: break;
836: case KEY_RSA:
837: if (key->rsa == NULL)
838: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 839: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 840: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 841: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
842: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 843: return ret;
844: break;
845: #endif /* WITH_OPENSSL */
846: case KEY_ED25519:
1.90 markus 847: case KEY_ED25519_SK:
1.1 djm 848: if (key->ed25519_pk == NULL)
849: return SSH_ERR_INVALID_ARGUMENT;
850: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
851: (ret = sshbuf_put_string(b,
852: key->ed25519_pk, ED25519_PK_SZ)) != 0)
853: return ret;
1.90 markus 854: if (type == KEY_ED25519_SK) {
855: if ((ret = sshbuf_put_cstring(b,
856: key->sk_application)) != 0)
857: return ret;
858: }
1.1 djm 859: break;
1.62 markus 860: #ifdef WITH_XMSS
861: case KEY_XMSS:
862: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
863: sshkey_xmss_pklen(key) == 0)
864: return SSH_ERR_INVALID_ARGUMENT;
865: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
866: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
867: (ret = sshbuf_put_string(b,
868: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
869: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
870: return ret;
871: break;
872: #endif /* WITH_XMSS */
1.1 djm 873: default:
874: return SSH_ERR_KEY_TYPE_UNKNOWN;
875: }
876: return 0;
877: }
878:
879: int
1.14 djm 880: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 881: {
1.62 markus 882: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 883: }
884:
885: int
1.62 markus 886: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
887: enum sshkey_serialize_rep opts)
1.14 djm 888: {
889: struct sshbuf *tmp;
890: int r;
891:
892: if ((tmp = sshbuf_new()) == NULL)
893: return SSH_ERR_ALLOC_FAIL;
1.62 markus 894: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 895: if (r == 0)
896: r = sshbuf_put_stringb(b, tmp);
897: sshbuf_free(tmp);
898: return r;
899: }
900:
901: int
1.62 markus 902: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
903: {
904: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
905: }
906:
907: int
1.14 djm 908: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 909: {
1.62 markus 910: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 911: }
912:
913: static int
1.62 markus 914: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
915: enum sshkey_serialize_rep opts)
1.1 djm 916: {
917: int ret = SSH_ERR_INTERNAL_ERROR;
918: size_t len;
919: struct sshbuf *b = NULL;
920:
921: if (lenp != NULL)
922: *lenp = 0;
923: if (blobp != NULL)
924: *blobp = NULL;
925: if ((b = sshbuf_new()) == NULL)
926: return SSH_ERR_ALLOC_FAIL;
1.62 markus 927: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 928: goto out;
929: len = sshbuf_len(b);
930: if (lenp != NULL)
931: *lenp = len;
932: if (blobp != NULL) {
933: if ((*blobp = malloc(len)) == NULL) {
934: ret = SSH_ERR_ALLOC_FAIL;
935: goto out;
936: }
937: memcpy(*blobp, sshbuf_ptr(b), len);
938: }
939: ret = 0;
940: out:
941: sshbuf_free(b);
942: return ret;
943: }
944:
945: int
946: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
947: {
1.62 markus 948: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 949: }
950:
951: int
952: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
953: {
1.62 markus 954: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 955: }
956:
957: int
1.7 djm 958: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 959: u_char **retp, size_t *lenp)
960: {
961: u_char *blob = NULL, *ret = NULL;
962: size_t blob_len = 0;
1.7 djm 963: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 964:
965: if (retp != NULL)
966: *retp = NULL;
967: if (lenp != NULL)
968: *lenp = 0;
1.7 djm 969: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 970: r = SSH_ERR_INVALID_ARGUMENT;
971: goto out;
972: }
1.62 markus 973: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
974: != 0)
1.1 djm 975: goto out;
976: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
977: r = SSH_ERR_ALLOC_FAIL;
978: goto out;
979: }
1.7 djm 980: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 981: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
982: goto out;
983: /* success */
984: if (retp != NULL) {
985: *retp = ret;
986: ret = NULL;
987: }
988: if (lenp != NULL)
1.7 djm 989: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 990: r = 0;
991: out:
992: free(ret);
1.100 jsg 993: if (blob != NULL)
994: freezero(blob, blob_len);
1.1 djm 995: return r;
996: }
997:
998: static char *
1.7 djm 999: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1000: {
1001: char *ret;
1002: size_t plen = strlen(alg) + 1;
1003: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
1004:
1005: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
1006: return NULL;
1007: strlcpy(ret, alg, rlen);
1008: strlcat(ret, ":", rlen);
1009: if (dgst_raw_len == 0)
1010: return ret;
1.79 dtucker 1011: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 1012: freezero(ret, rlen);
1.7 djm 1013: return NULL;
1014: }
1015: /* Trim padding characters from end */
1016: ret[strcspn(ret, "=")] = '\0';
1017: return ret;
1018: }
1019:
1020: static char *
1021: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 1022: {
1.7 djm 1023: char *retval, hex[5];
1024: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 1025:
1.7 djm 1026: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 1027: return NULL;
1.7 djm 1028: strlcpy(retval, alg, rlen);
1029: strlcat(retval, ":", rlen);
1.1 djm 1030: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 1031: snprintf(hex, sizeof(hex), "%s%02x",
1032: i > 0 ? ":" : "", dgst_raw[i]);
1033: strlcat(retval, hex, rlen);
1.1 djm 1034: }
1035: return retval;
1036: }
1037:
1038: static char *
1039: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
1040: {
1041: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1042: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1043: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1044: u_int i, j = 0, rounds, seed = 1;
1045: char *retval;
1046:
1047: rounds = (dgst_raw_len / 2) + 1;
1048: if ((retval = calloc(rounds, 6)) == NULL)
1049: return NULL;
1050: retval[j++] = 'x';
1051: for (i = 0; i < rounds; i++) {
1052: u_int idx0, idx1, idx2, idx3, idx4;
1053: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1054: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1055: seed) % 6;
1056: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1057: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1058: (seed / 6)) % 6;
1059: retval[j++] = vowels[idx0];
1060: retval[j++] = consonants[idx1];
1061: retval[j++] = vowels[idx2];
1062: if ((i + 1) < rounds) {
1063: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1064: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1065: retval[j++] = consonants[idx3];
1066: retval[j++] = '-';
1067: retval[j++] = consonants[idx4];
1068: seed = ((seed * 5) +
1069: ((((u_int)(dgst_raw[2 * i])) * 7) +
1070: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1071: }
1072: } else {
1073: idx0 = seed % 6;
1074: idx1 = 16;
1075: idx2 = seed / 6;
1076: retval[j++] = vowels[idx0];
1077: retval[j++] = consonants[idx1];
1078: retval[j++] = vowels[idx2];
1079: }
1080: }
1081: retval[j++] = 'x';
1082: retval[j++] = '\0';
1083: return retval;
1084: }
1085:
1086: /*
1087: * Draw an ASCII-Art representing the fingerprint so human brain can
1088: * profit from its built-in pattern recognition ability.
1089: * This technique is called "random art" and can be found in some
1090: * scientific publications like this original paper:
1091: *
1092: * "Hash Visualization: a New Technique to improve Real-World Security",
1093: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1094: * Techniques and E-Commerce (CrypTEC '99)
1095: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1096: *
1097: * The subject came up in a talk by Dan Kaminsky, too.
1098: *
1099: * If you see the picture is different, the key is different.
1100: * If the picture looks the same, you still know nothing.
1101: *
1102: * The algorithm used here is a worm crawling over a discrete plane,
1103: * leaving a trace (augmenting the field) everywhere it goes.
1104: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1105: * makes the respective movement vector be ignored for this turn.
1106: * Graphs are not unambiguous, because circles in graphs can be
1107: * walked in either direction.
1108: */
1109:
1110: /*
1111: * Field sizes for the random art. Have to be odd, so the starting point
1112: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1113: * Else pictures would be too dense, and drawing the frame would
1114: * fail, too, because the key type would not fit in anymore.
1115: */
1116: #define FLDBASE 8
1117: #define FLDSIZE_Y (FLDBASE + 1)
1118: #define FLDSIZE_X (FLDBASE * 2 + 1)
1119: static char *
1.7 djm 1120: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1121: const struct sshkey *k)
1122: {
1123: /*
1124: * Chars to be used after each other every time the worm
1125: * intersects with itself. Matter of taste.
1126: */
1127: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1128: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1129: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1130: size_t i, tlen, hlen;
1.1 djm 1131: u_int b;
1.3 djm 1132: int x, y, r;
1.1 djm 1133: size_t len = strlen(augmentation_string) - 1;
1134:
1135: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1136: return NULL;
1137:
1138: /* initialize field */
1139: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1140: x = FLDSIZE_X / 2;
1141: y = FLDSIZE_Y / 2;
1142:
1143: /* process raw key */
1144: for (i = 0; i < dgst_raw_len; i++) {
1145: int input;
1146: /* each byte conveys four 2-bit move commands */
1147: input = dgst_raw[i];
1148: for (b = 0; b < 4; b++) {
1149: /* evaluate 2 bit, rest is shifted later */
1150: x += (input & 0x1) ? 1 : -1;
1151: y += (input & 0x2) ? 1 : -1;
1152:
1153: /* assure we are still in bounds */
1.37 deraadt 1154: x = MAXIMUM(x, 0);
1155: y = MAXIMUM(y, 0);
1156: x = MINIMUM(x, FLDSIZE_X - 1);
1157: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1158:
1159: /* augment the field */
1160: if (field[x][y] < len - 2)
1161: field[x][y]++;
1162: input = input >> 2;
1163: }
1164: }
1165:
1166: /* mark starting point and end point*/
1167: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1168: field[x][y] = len;
1169:
1.3 djm 1170: /* assemble title */
1171: r = snprintf(title, sizeof(title), "[%s %u]",
1172: sshkey_type(k), sshkey_size(k));
1173: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1174: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1175: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1176: tlen = (r <= 0) ? 0 : strlen(title);
1177:
1178: /* assemble hash ID. */
1179: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1180: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1181:
1182: /* output upper border */
1.3 djm 1183: p = retval;
1184: *p++ = '+';
1185: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1186: *p++ = '-';
1187: memcpy(p, title, tlen);
1188: p += tlen;
1.7 djm 1189: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1190: *p++ = '-';
1191: *p++ = '+';
1192: *p++ = '\n';
1193:
1194: /* output content */
1195: for (y = 0; y < FLDSIZE_Y; y++) {
1196: *p++ = '|';
1197: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1198: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1199: *p++ = '|';
1200: *p++ = '\n';
1201: }
1202:
1203: /* output lower border */
1204: *p++ = '+';
1.7 djm 1205: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1206: *p++ = '-';
1207: memcpy(p, hash, hlen);
1208: p += hlen;
1209: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1210: *p++ = '-';
1211: *p++ = '+';
1212:
1213: return retval;
1214: }
1215:
1216: char *
1.7 djm 1217: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1218: enum sshkey_fp_rep dgst_rep)
1219: {
1220: char *retval = NULL;
1221: u_char *dgst_raw;
1222: size_t dgst_raw_len;
1223:
1.7 djm 1224: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1225: return NULL;
1226: switch (dgst_rep) {
1.7 djm 1227: case SSH_FP_DEFAULT:
1228: if (dgst_alg == SSH_DIGEST_MD5) {
1229: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1230: dgst_raw, dgst_raw_len);
1231: } else {
1232: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1233: dgst_raw, dgst_raw_len);
1234: }
1235: break;
1.1 djm 1236: case SSH_FP_HEX:
1.7 djm 1237: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1238: dgst_raw, dgst_raw_len);
1239: break;
1240: case SSH_FP_BASE64:
1241: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1242: dgst_raw, dgst_raw_len);
1.1 djm 1243: break;
1244: case SSH_FP_BUBBLEBABBLE:
1245: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1246: break;
1247: case SSH_FP_RANDOMART:
1.7 djm 1248: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1249: dgst_raw, dgst_raw_len, k);
1.1 djm 1250: break;
1251: default:
1.100 jsg 1252: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1253: return NULL;
1254: }
1.100 jsg 1255: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1256: return retval;
1257: }
1258:
1.63 djm 1259: static int
1260: peek_type_nid(const char *s, size_t l, int *nid)
1261: {
1262: const struct keytype *kt;
1263:
1264: for (kt = keytypes; kt->type != -1; kt++) {
1265: if (kt->name == NULL || strlen(kt->name) != l)
1266: continue;
1267: if (memcmp(s, kt->name, l) == 0) {
1268: *nid = -1;
1.85 djm 1269: if (key_type_is_ecdsa_variant(kt->type))
1.63 djm 1270: *nid = kt->nid;
1271: return kt->type;
1272: }
1273: }
1274: return KEY_UNSPEC;
1275: }
1276:
1.1 djm 1277:
1.63 djm 1278: /* XXX this can now be made const char * */
1.1 djm 1279: int
1280: sshkey_read(struct sshkey *ret, char **cpp)
1281: {
1282: struct sshkey *k;
1.63 djm 1283: char *cp, *blobcopy;
1284: size_t space;
1.1 djm 1285: int r, type, curve_nid = -1;
1286: struct sshbuf *blob;
1.44 dtucker 1287:
1288: if (ret == NULL)
1289: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1290:
1291: switch (ret->type) {
1292: case KEY_UNSPEC:
1293: case KEY_RSA:
1294: case KEY_DSA:
1295: case KEY_ECDSA:
1.85 djm 1296: case KEY_ECDSA_SK:
1.1 djm 1297: case KEY_ED25519:
1.90 markus 1298: case KEY_ED25519_SK:
1.1 djm 1299: case KEY_DSA_CERT:
1300: case KEY_ECDSA_CERT:
1.85 djm 1301: case KEY_ECDSA_SK_CERT:
1.1 djm 1302: case KEY_RSA_CERT:
1303: case KEY_ED25519_CERT:
1.90 markus 1304: case KEY_ED25519_SK_CERT:
1.62 markus 1305: #ifdef WITH_XMSS
1306: case KEY_XMSS:
1307: case KEY_XMSS_CERT:
1308: #endif /* WITH_XMSS */
1.63 djm 1309: break; /* ok */
1310: default:
1311: return SSH_ERR_INVALID_ARGUMENT;
1312: }
1313:
1314: /* Decode type */
1315: cp = *cpp;
1316: space = strcspn(cp, " \t");
1317: if (space == strlen(cp))
1318: return SSH_ERR_INVALID_FORMAT;
1319: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1320: return SSH_ERR_INVALID_FORMAT;
1321:
1322: /* skip whitespace */
1323: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1324: ;
1325: if (*cp == '\0')
1326: return SSH_ERR_INVALID_FORMAT;
1327: if (ret->type != KEY_UNSPEC && ret->type != type)
1328: return SSH_ERR_KEY_TYPE_MISMATCH;
1329: if ((blob = sshbuf_new()) == NULL)
1330: return SSH_ERR_ALLOC_FAIL;
1331:
1332: /* find end of keyblob and decode */
1333: space = strcspn(cp, " \t");
1334: if ((blobcopy = strndup(cp, space)) == NULL) {
1335: sshbuf_free(blob);
1336: return SSH_ERR_ALLOC_FAIL;
1337: }
1338: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1339: free(blobcopy);
1340: sshbuf_free(blob);
1341: return r;
1342: }
1343: free(blobcopy);
1344: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1345: sshbuf_free(blob);
1.63 djm 1346: return r;
1347: }
1348: sshbuf_free(blob);
1349:
1350: /* skip whitespace and leave cp at start of comment */
1351: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1352: ;
1353:
1354: /* ensure type of blob matches type at start of line */
1355: if (k->type != type) {
1356: sshkey_free(k);
1357: return SSH_ERR_KEY_TYPE_MISMATCH;
1358: }
1.85 djm 1359: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1360: sshkey_free(k);
1361: return SSH_ERR_EC_CURVE_MISMATCH;
1362: }
1363:
1364: /* Fill in ret from parsed key */
1365: ret->type = type;
1366: if (sshkey_is_cert(ret)) {
1367: if (!sshkey_is_cert(k)) {
1.1 djm 1368: sshkey_free(k);
1.63 djm 1369: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1370: }
1.63 djm 1371: if (ret->cert != NULL)
1372: cert_free(ret->cert);
1373: ret->cert = k->cert;
1374: k->cert = NULL;
1375: }
1376: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1377: #ifdef WITH_OPENSSL
1.63 djm 1378: case KEY_RSA:
1379: RSA_free(ret->rsa);
1380: ret->rsa = k->rsa;
1381: k->rsa = NULL;
1.1 djm 1382: #ifdef DEBUG_PK
1.63 djm 1383: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1384: #endif
1.63 djm 1385: break;
1386: case KEY_DSA:
1387: DSA_free(ret->dsa);
1388: ret->dsa = k->dsa;
1389: k->dsa = NULL;
1.1 djm 1390: #ifdef DEBUG_PK
1.63 djm 1391: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1392: #endif
1.63 djm 1393: break;
1394: case KEY_ECDSA:
1395: EC_KEY_free(ret->ecdsa);
1396: ret->ecdsa = k->ecdsa;
1397: ret->ecdsa_nid = k->ecdsa_nid;
1398: k->ecdsa = NULL;
1399: k->ecdsa_nid = -1;
1.1 djm 1400: #ifdef DEBUG_PK
1.63 djm 1401: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1402: #endif
1.63 djm 1403: break;
1.85 djm 1404: case KEY_ECDSA_SK:
1405: EC_KEY_free(ret->ecdsa);
1406: ret->ecdsa = k->ecdsa;
1407: ret->ecdsa_nid = k->ecdsa_nid;
1408: ret->sk_application = k->sk_application;
1409: k->ecdsa = NULL;
1410: k->ecdsa_nid = -1;
1411: k->sk_application = NULL;
1412: #ifdef DEBUG_PK
1413: sshkey_dump_ec_key(ret->ecdsa);
1414: fprintf(stderr, "App: %s\n", ret->sk_application);
1415: #endif
1416: break;
1.1 djm 1417: #endif /* WITH_OPENSSL */
1.63 djm 1418: case KEY_ED25519:
1419: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1420: ret->ed25519_pk = k->ed25519_pk;
1421: k->ed25519_pk = NULL;
1.1 djm 1422: #ifdef DEBUG_PK
1.63 djm 1423: /* XXX */
1.1 djm 1424: #endif
1.63 djm 1425: break;
1.90 markus 1426: case KEY_ED25519_SK:
1427: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1428: ret->ed25519_pk = k->ed25519_pk;
1429: ret->sk_application = k->sk_application;
1430: k->ed25519_pk = NULL;
1431: k->sk_application = NULL;
1432: break;
1.62 markus 1433: #ifdef WITH_XMSS
1.63 djm 1434: case KEY_XMSS:
1435: free(ret->xmss_pk);
1436: ret->xmss_pk = k->xmss_pk;
1437: k->xmss_pk = NULL;
1438: free(ret->xmss_state);
1439: ret->xmss_state = k->xmss_state;
1440: k->xmss_state = NULL;
1441: free(ret->xmss_name);
1442: ret->xmss_name = k->xmss_name;
1443: k->xmss_name = NULL;
1444: free(ret->xmss_filename);
1445: ret->xmss_filename = k->xmss_filename;
1446: k->xmss_filename = NULL;
1.62 markus 1447: #ifdef DEBUG_PK
1.63 djm 1448: /* XXX */
1.62 markus 1449: #endif
1.63 djm 1450: break;
1.62 markus 1451: #endif /* WITH_XMSS */
1.63 djm 1452: default:
1.1 djm 1453: sshkey_free(k);
1.63 djm 1454: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1455: }
1.63 djm 1456: sshkey_free(k);
1457:
1458: /* success */
1459: *cpp = cp;
1460: return 0;
1.1 djm 1461: }
1462:
1463: int
1.19 djm 1464: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1465: {
1.19 djm 1466: int r = SSH_ERR_INTERNAL_ERROR;
1467: struct sshbuf *b = NULL;
1.1 djm 1468: char *uu = NULL;
1.19 djm 1469:
1470: if (b64p != NULL)
1471: *b64p = NULL;
1472: if ((b = sshbuf_new()) == NULL)
1473: return SSH_ERR_ALLOC_FAIL;
1474: if ((r = sshkey_putb(key, b)) != 0)
1475: goto out;
1.81 djm 1476: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1477: r = SSH_ERR_ALLOC_FAIL;
1478: goto out;
1479: }
1480: /* Success */
1481: if (b64p != NULL) {
1482: *b64p = uu;
1483: uu = NULL;
1484: }
1485: r = 0;
1486: out:
1487: sshbuf_free(b);
1488: free(uu);
1489: return r;
1490: }
1491:
1.52 djm 1492: int
1.19 djm 1493: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1494: {
1495: int r = SSH_ERR_INTERNAL_ERROR;
1496: char *uu = NULL;
1497:
1.48 djm 1498: if ((r = sshkey_to_base64(key, &uu)) != 0)
1499: goto out;
1500: if ((r = sshbuf_putf(b, "%s %s",
1501: sshkey_ssh_name(key), uu)) != 0)
1502: goto out;
1.19 djm 1503: r = 0;
1504: out:
1505: free(uu);
1506: return r;
1507: }
1508:
1509: int
1510: sshkey_write(const struct sshkey *key, FILE *f)
1511: {
1512: struct sshbuf *b = NULL;
1513: int r = SSH_ERR_INTERNAL_ERROR;
1514:
1515: if ((b = sshbuf_new()) == NULL)
1516: return SSH_ERR_ALLOC_FAIL;
1517: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1518: goto out;
1519: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1520: if (feof(f))
1521: errno = EPIPE;
1.19 djm 1522: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1523: goto out;
1524: }
1.19 djm 1525: /* Success */
1526: r = 0;
1.1 djm 1527: out:
1.19 djm 1528: sshbuf_free(b);
1529: return r;
1.1 djm 1530: }
1531:
1532: const char *
1533: sshkey_cert_type(const struct sshkey *k)
1534: {
1535: switch (k->cert->type) {
1536: case SSH2_CERT_TYPE_USER:
1537: return "user";
1538: case SSH2_CERT_TYPE_HOST:
1539: return "host";
1540: default:
1541: return "unknown";
1542: }
1543: }
1544:
1545: #ifdef WITH_OPENSSL
1546: static int
1547: rsa_generate_private_key(u_int bits, RSA **rsap)
1548: {
1549: RSA *private = NULL;
1550: BIGNUM *f4 = NULL;
1551: int ret = SSH_ERR_INTERNAL_ERROR;
1552:
1.49 djm 1553: if (rsap == NULL)
1554: return SSH_ERR_INVALID_ARGUMENT;
1555: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1556: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1557: return SSH_ERR_KEY_LENGTH;
1.1 djm 1558: *rsap = NULL;
1559: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1560: ret = SSH_ERR_ALLOC_FAIL;
1561: goto out;
1562: }
1563: if (!BN_set_word(f4, RSA_F4) ||
1564: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1565: ret = SSH_ERR_LIBCRYPTO_ERROR;
1566: goto out;
1567: }
1568: *rsap = private;
1569: private = NULL;
1570: ret = 0;
1571: out:
1.60 jsing 1572: RSA_free(private);
1573: BN_free(f4);
1.1 djm 1574: return ret;
1575: }
1576:
1577: static int
1578: dsa_generate_private_key(u_int bits, DSA **dsap)
1579: {
1580: DSA *private;
1581: int ret = SSH_ERR_INTERNAL_ERROR;
1582:
1.49 djm 1583: if (dsap == NULL)
1.1 djm 1584: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1585: if (bits != 1024)
1586: return SSH_ERR_KEY_LENGTH;
1.1 djm 1587: if ((private = DSA_new()) == NULL) {
1588: ret = SSH_ERR_ALLOC_FAIL;
1589: goto out;
1590: }
1591: *dsap = NULL;
1592: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1593: NULL, NULL) || !DSA_generate_key(private)) {
1594: ret = SSH_ERR_LIBCRYPTO_ERROR;
1595: goto out;
1596: }
1597: *dsap = private;
1598: private = NULL;
1599: ret = 0;
1600: out:
1.60 jsing 1601: DSA_free(private);
1.1 djm 1602: return ret;
1603: }
1604:
1605: int
1606: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1607: {
1608: EC_GROUP *eg;
1609: int nids[] = {
1610: NID_X9_62_prime256v1,
1611: NID_secp384r1,
1612: NID_secp521r1,
1613: -1
1614: };
1615: int nid;
1616: u_int i;
1617: const EC_GROUP *g = EC_KEY_get0_group(k);
1618:
1619: /*
1620: * The group may be stored in a ASN.1 encoded private key in one of two
1621: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1622: * or explicit group parameters encoded into the key blob. Only the
1623: * "named group" case sets the group NID for us, but we can figure
1624: * it out for the other case by comparing against all the groups that
1625: * are supported.
1626: */
1627: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1628: return nid;
1629: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1630: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1631: return -1;
1.93 djm 1632: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1633: break;
1634: EC_GROUP_free(eg);
1635: }
1636: if (nids[i] != -1) {
1637: /* Use the group with the NID attached */
1638: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1639: if (EC_KEY_set_group(k, eg) != 1) {
1640: EC_GROUP_free(eg);
1641: return -1;
1642: }
1643: }
1644: return nids[i];
1645: }
1646:
1647: static int
1648: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1649: {
1650: EC_KEY *private;
1651: int ret = SSH_ERR_INTERNAL_ERROR;
1652:
1.50 djm 1653: if (nid == NULL || ecdsap == NULL)
1.1 djm 1654: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1655: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1656: return SSH_ERR_KEY_LENGTH;
1.1 djm 1657: *ecdsap = NULL;
1658: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1659: ret = SSH_ERR_ALLOC_FAIL;
1660: goto out;
1661: }
1662: if (EC_KEY_generate_key(private) != 1) {
1663: ret = SSH_ERR_LIBCRYPTO_ERROR;
1664: goto out;
1665: }
1666: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1667: *ecdsap = private;
1668: private = NULL;
1669: ret = 0;
1670: out:
1.60 jsing 1671: EC_KEY_free(private);
1.1 djm 1672: return ret;
1673: }
1674: #endif /* WITH_OPENSSL */
1675:
1676: int
1677: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1678: {
1679: struct sshkey *k;
1680: int ret = SSH_ERR_INTERNAL_ERROR;
1681:
1682: if (keyp == NULL)
1683: return SSH_ERR_INVALID_ARGUMENT;
1684: *keyp = NULL;
1685: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1686: return SSH_ERR_ALLOC_FAIL;
1687: switch (type) {
1688: case KEY_ED25519:
1689: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1690: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1691: ret = SSH_ERR_ALLOC_FAIL;
1692: break;
1693: }
1694: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1695: ret = 0;
1696: break;
1.62 markus 1697: #ifdef WITH_XMSS
1698: case KEY_XMSS:
1699: ret = sshkey_xmss_generate_private_key(k, bits);
1700: break;
1701: #endif /* WITH_XMSS */
1.1 djm 1702: #ifdef WITH_OPENSSL
1703: case KEY_DSA:
1704: ret = dsa_generate_private_key(bits, &k->dsa);
1705: break;
1706: case KEY_ECDSA:
1707: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1708: &k->ecdsa);
1709: break;
1710: case KEY_RSA:
1711: ret = rsa_generate_private_key(bits, &k->rsa);
1712: break;
1713: #endif /* WITH_OPENSSL */
1714: default:
1715: ret = SSH_ERR_INVALID_ARGUMENT;
1716: }
1717: if (ret == 0) {
1718: k->type = type;
1719: *keyp = k;
1720: } else
1721: sshkey_free(k);
1722: return ret;
1723: }
1724:
1725: int
1726: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1727: {
1728: u_int i;
1729: const struct sshkey_cert *from;
1730: struct sshkey_cert *to;
1.67 djm 1731: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1732:
1.67 djm 1733: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1734: return SSH_ERR_INVALID_ARGUMENT;
1735:
1.67 djm 1736: if ((to = cert_new()) == NULL)
1.1 djm 1737: return SSH_ERR_ALLOC_FAIL;
1738:
1.67 djm 1739: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1740: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1741: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1742: goto out;
1.1 djm 1743:
1744: to->serial = from->serial;
1745: to->type = from->type;
1746: if (from->key_id == NULL)
1747: to->key_id = NULL;
1.67 djm 1748: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1749: r = SSH_ERR_ALLOC_FAIL;
1750: goto out;
1751: }
1.1 djm 1752: to->valid_after = from->valid_after;
1753: to->valid_before = from->valid_before;
1754: if (from->signature_key == NULL)
1755: to->signature_key = NULL;
1.67 djm 1756: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1757: &to->signature_key)) != 0)
1.67 djm 1758: goto out;
1759: if (from->signature_type != NULL &&
1760: (to->signature_type = strdup(from->signature_type)) == NULL) {
1761: r = SSH_ERR_ALLOC_FAIL;
1762: goto out;
1763: }
1764: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1765: r = SSH_ERR_INVALID_ARGUMENT;
1766: goto out;
1767: }
1.1 djm 1768: if (from->nprincipals > 0) {
1769: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1770: sizeof(*to->principals))) == NULL) {
1771: r = SSH_ERR_ALLOC_FAIL;
1772: goto out;
1773: }
1.1 djm 1774: for (i = 0; i < from->nprincipals; i++) {
1775: to->principals[i] = strdup(from->principals[i]);
1776: if (to->principals[i] == NULL) {
1777: to->nprincipals = i;
1.67 djm 1778: r = SSH_ERR_ALLOC_FAIL;
1779: goto out;
1.1 djm 1780: }
1781: }
1782: }
1783: to->nprincipals = from->nprincipals;
1.67 djm 1784:
1785: /* success */
1786: cert_free(to_key->cert);
1787: to_key->cert = to;
1788: to = NULL;
1789: r = 0;
1790: out:
1791: cert_free(to);
1792: return r;
1.1 djm 1793: }
1794:
1795: int
1796: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1797: {
1798: struct sshkey *n = NULL;
1.69 djm 1799: int r = SSH_ERR_INTERNAL_ERROR;
1800: #ifdef WITH_OPENSSL
1801: const BIGNUM *rsa_n, *rsa_e;
1802: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1803: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1804: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1805: BIGNUM *dsa_pub_key_dup = NULL;
1806: #endif /* WITH_OPENSSL */
1.1 djm 1807:
1.24 djm 1808: *pkp = NULL;
1.85 djm 1809: if ((n = sshkey_new(k->type)) == NULL) {
1810: r = SSH_ERR_ALLOC_FAIL;
1811: goto out;
1812: }
1.1 djm 1813: switch (k->type) {
1814: #ifdef WITH_OPENSSL
1815: case KEY_DSA:
1816: case KEY_DSA_CERT:
1.69 djm 1817: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1818: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1819: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1820: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1821: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1822: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1823: r = SSH_ERR_ALLOC_FAIL;
1824: goto out;
1825: }
1826: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1827: r = SSH_ERR_LIBCRYPTO_ERROR;
1828: goto out;
1.1 djm 1829: }
1.69 djm 1830: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1831: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1832: r = SSH_ERR_LIBCRYPTO_ERROR;
1833: goto out;
1834: }
1835: dsa_pub_key_dup = NULL; /* transferred */
1836:
1.1 djm 1837: break;
1838: case KEY_ECDSA:
1839: case KEY_ECDSA_CERT:
1.85 djm 1840: case KEY_ECDSA_SK:
1841: case KEY_ECDSA_SK_CERT:
1.1 djm 1842: n->ecdsa_nid = k->ecdsa_nid;
1843: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1844: if (n->ecdsa == NULL) {
1.69 djm 1845: r = SSH_ERR_ALLOC_FAIL;
1846: goto out;
1.1 djm 1847: }
1848: if (EC_KEY_set_public_key(n->ecdsa,
1849: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1850: r = SSH_ERR_LIBCRYPTO_ERROR;
1851: goto out;
1.1 djm 1852: }
1.85 djm 1853: if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT)
1854: break;
1855: /* Append security-key application string */
1856: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1857: goto out;
1.1 djm 1858: break;
1859: case KEY_RSA:
1860: case KEY_RSA_CERT:
1.69 djm 1861: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1862: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1863: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1864: r = SSH_ERR_ALLOC_FAIL;
1865: goto out;
1866: }
1867: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1868: r = SSH_ERR_LIBCRYPTO_ERROR;
1869: goto out;
1870: }
1871: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1872: break;
1873: #endif /* WITH_OPENSSL */
1874: case KEY_ED25519:
1875: case KEY_ED25519_CERT:
1.90 markus 1876: case KEY_ED25519_SK:
1877: case KEY_ED25519_SK_CERT:
1.1 djm 1878: if (k->ed25519_pk != NULL) {
1879: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1880: r = SSH_ERR_ALLOC_FAIL;
1881: goto out;
1.1 djm 1882: }
1883: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1884: }
1.90 markus 1885: if (k->type != KEY_ED25519_SK &&
1886: k->type != KEY_ED25519_SK_CERT)
1887: break;
1888: /* Append security-key application string */
1889: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1890: goto out;
1.1 djm 1891: break;
1.62 markus 1892: #ifdef WITH_XMSS
1893: case KEY_XMSS:
1894: case KEY_XMSS_CERT:
1.69 djm 1895: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1896: goto out;
1.62 markus 1897: if (k->xmss_pk != NULL) {
1.92 markus 1898: u_int32_t left;
1.62 markus 1899: size_t pklen = sshkey_xmss_pklen(k);
1900: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1901: r = SSH_ERR_INTERNAL_ERROR;
1902: goto out;
1.62 markus 1903: }
1904: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1905: r = SSH_ERR_ALLOC_FAIL;
1906: goto out;
1.62 markus 1907: }
1908: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1.92 markus 1909: /* simulate number of signatures left on pubkey */
1910: left = sshkey_xmss_signatures_left(k);
1911: if (left)
1912: sshkey_xmss_enable_maxsign(n, left);
1.62 markus 1913: }
1914: break;
1915: #endif /* WITH_XMSS */
1.1 djm 1916: default:
1.69 djm 1917: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1918: goto out;
1.1 djm 1919: }
1.69 djm 1920: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1921: goto out;
1922: /* success */
1.1 djm 1923: *pkp = n;
1.69 djm 1924: n = NULL;
1925: r = 0;
1926: out:
1927: sshkey_free(n);
1.83 djm 1928: #ifdef WITH_OPENSSL
1.69 djm 1929: BN_clear_free(rsa_n_dup);
1930: BN_clear_free(rsa_e_dup);
1931: BN_clear_free(dsa_p_dup);
1932: BN_clear_free(dsa_q_dup);
1933: BN_clear_free(dsa_g_dup);
1934: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1935: #endif /* WITH_OPENSSL */
1.69 djm 1936:
1937: return r;
1.1 djm 1938: }
1939:
1.76 djm 1940: int
1941: sshkey_is_shielded(struct sshkey *k)
1942: {
1943: return k != NULL && k->shielded_private != NULL;
1944: }
1945:
1946: int
1947: sshkey_shield_private(struct sshkey *k)
1948: {
1949: struct sshbuf *prvbuf = NULL;
1950: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1951: struct sshcipher_ctx *cctx = NULL;
1952: const struct sshcipher *cipher;
1953: size_t i, enclen = 0;
1954: struct sshkey *kswap = NULL, tmp;
1955: int r = SSH_ERR_INTERNAL_ERROR;
1956:
1957: #ifdef DEBUG_PK
1958: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1959: #endif
1960: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1961: r = SSH_ERR_INVALID_ARGUMENT;
1962: goto out;
1963: }
1964: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1965: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1966: r = SSH_ERR_INTERNAL_ERROR;
1967: goto out;
1968: }
1969:
1970: /* Prepare a random pre-key, and from it an ephemeral key */
1971: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1972: r = SSH_ERR_ALLOC_FAIL;
1973: goto out;
1974: }
1975: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1976: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1977: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1978: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1979: goto out;
1980: #ifdef DEBUG_PK
1981: fprintf(stderr, "%s: key+iv\n", __func__);
1982: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1983: stderr);
1984: #endif
1985: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1986: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1987: goto out;
1988:
1989: /* Serialise and encrypt the private key using the ephemeral key */
1990: if ((prvbuf = sshbuf_new()) == NULL) {
1991: r = SSH_ERR_ALLOC_FAIL;
1992: goto out;
1993: }
1994: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1995: goto out;
1996: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.91 markus 1997: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 1998: goto out;
1999: /* pad to cipher blocksize */
2000: i = 0;
2001: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
2002: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
2003: goto out;
2004: }
2005: #ifdef DEBUG_PK
2006: fprintf(stderr, "%s: serialised\n", __func__);
2007: sshbuf_dump(prvbuf, stderr);
2008: #endif
2009: /* encrypt */
2010: enclen = sshbuf_len(prvbuf);
2011: if ((enc = malloc(enclen)) == NULL) {
2012: r = SSH_ERR_ALLOC_FAIL;
2013: goto out;
2014: }
2015: if ((r = cipher_crypt(cctx, 0, enc,
2016: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
2017: goto out;
2018: #ifdef DEBUG_PK
2019: fprintf(stderr, "%s: encrypted\n", __func__);
2020: sshbuf_dump_data(enc, enclen, stderr);
2021: #endif
2022:
2023: /* Make a scrubbed, public-only copy of our private key argument */
2024: if ((r = sshkey_from_private(k, &kswap)) != 0)
2025: goto out;
2026:
2027: /* Swap the private key out (it will be destroyed below) */
2028: tmp = *kswap;
2029: *kswap = *k;
2030: *k = tmp;
2031:
2032: /* Insert the shielded key into our argument */
2033: k->shielded_private = enc;
2034: k->shielded_len = enclen;
2035: k->shield_prekey = prekey;
2036: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
2037: enc = prekey = NULL; /* transferred */
2038: enclen = 0;
1.99 djm 2039:
2040: /* preserve key fields that are required for correct operation */
2041: k->sk_flags = kswap->sk_flags;
1.76 djm 2042:
2043: /* success */
2044: r = 0;
2045:
2046: out:
2047: /* XXX behaviour on error - invalidate original private key? */
2048: cipher_free(cctx);
2049: explicit_bzero(keyiv, sizeof(keyiv));
2050: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 2051: freezero(enc, enclen);
1.76 djm 2052: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
2053: sshkey_free(kswap);
2054: sshbuf_free(prvbuf);
2055: return r;
2056: }
2057:
2058: int
2059: sshkey_unshield_private(struct sshkey *k)
2060: {
2061: struct sshbuf *prvbuf = NULL;
2062: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
2063: struct sshcipher_ctx *cctx = NULL;
2064: const struct sshcipher *cipher;
2065: size_t i;
2066: struct sshkey *kswap = NULL, tmp;
2067: int r = SSH_ERR_INTERNAL_ERROR;
2068:
2069: #ifdef DEBUG_PK
2070: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
2071: #endif
2072: if (!sshkey_is_shielded(k))
2073: return 0; /* nothing to do */
2074:
2075: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
2076: r = SSH_ERR_INVALID_ARGUMENT;
2077: goto out;
2078: }
2079: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
2080: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
2081: r = SSH_ERR_INTERNAL_ERROR;
2082: goto out;
2083: }
2084: /* check size of shielded key blob */
2085: if (k->shielded_len < cipher_blocksize(cipher) ||
2086: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
2087: r = SSH_ERR_INVALID_FORMAT;
2088: goto out;
2089: }
2090:
2091: /* Calculate the ephemeral key from the prekey */
2092: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2093: k->shield_prekey, k->shield_prekey_len,
2094: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2095: goto out;
2096: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2097: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2098: goto out;
2099: #ifdef DEBUG_PK
2100: fprintf(stderr, "%s: key+iv\n", __func__);
2101: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2102: stderr);
2103: #endif
2104:
2105: /* Decrypt and parse the shielded private key using the ephemeral key */
2106: if ((prvbuf = sshbuf_new()) == NULL) {
2107: r = SSH_ERR_ALLOC_FAIL;
2108: goto out;
2109: }
2110: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2111: goto out;
2112: /* decrypt */
2113: #ifdef DEBUG_PK
2114: fprintf(stderr, "%s: encrypted\n", __func__);
2115: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2116: #endif
2117: if ((r = cipher_crypt(cctx, 0, cp,
2118: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2119: goto out;
2120: #ifdef DEBUG_PK
2121: fprintf(stderr, "%s: serialised\n", __func__);
2122: sshbuf_dump(prvbuf, stderr);
2123: #endif
2124: /* Parse private key */
2125: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2126: goto out;
2127: /* Check deterministic padding */
2128: i = 0;
2129: while (sshbuf_len(prvbuf)) {
2130: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2131: goto out;
2132: if (pad != (++i & 0xff)) {
2133: r = SSH_ERR_INVALID_FORMAT;
2134: goto out;
2135: }
2136: }
2137:
2138: /* Swap the parsed key back into place */
2139: tmp = *kswap;
2140: *kswap = *k;
2141: *k = tmp;
2142:
2143: /* success */
2144: r = 0;
2145:
2146: out:
2147: cipher_free(cctx);
2148: explicit_bzero(keyiv, sizeof(keyiv));
2149: explicit_bzero(&tmp, sizeof(tmp));
2150: sshkey_free(kswap);
2151: sshbuf_free(prvbuf);
2152: return r;
2153: }
2154:
1.1 djm 2155: static int
1.14 djm 2156: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2157: {
1.14 djm 2158: struct sshbuf *principals = NULL, *crit = NULL;
2159: struct sshbuf *exts = NULL, *ca = NULL;
2160: u_char *sig = NULL;
2161: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2162: int ret = SSH_ERR_INTERNAL_ERROR;
2163:
2164: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2165: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2166: return ret;
2167:
1.20 djm 2168: /* Parse body of certificate up to signature */
2169: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2170: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2171: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2172: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2173: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2174: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2175: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2176: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2177: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2178: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2179: /* XXX debug print error for ret */
2180: ret = SSH_ERR_INVALID_FORMAT;
2181: goto out;
2182: }
2183:
2184: /* Signature is left in the buffer so we can calculate this length */
2185: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2186:
2187: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2188: ret = SSH_ERR_INVALID_FORMAT;
2189: goto out;
2190: }
2191:
2192: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2193: key->cert->type != SSH2_CERT_TYPE_HOST) {
2194: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2195: goto out;
2196: }
2197:
1.4 djm 2198: /* Parse principals section */
2199: while (sshbuf_len(principals) > 0) {
2200: char *principal = NULL;
2201: char **oprincipals = NULL;
2202:
1.1 djm 2203: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2204: ret = SSH_ERR_INVALID_FORMAT;
2205: goto out;
2206: }
1.4 djm 2207: if ((ret = sshbuf_get_cstring(principals, &principal,
2208: NULL)) != 0) {
1.1 djm 2209: ret = SSH_ERR_INVALID_FORMAT;
2210: goto out;
2211: }
2212: oprincipals = key->cert->principals;
1.51 deraadt 2213: key->cert->principals = recallocarray(key->cert->principals,
2214: key->cert->nprincipals, key->cert->nprincipals + 1,
2215: sizeof(*key->cert->principals));
1.1 djm 2216: if (key->cert->principals == NULL) {
2217: free(principal);
2218: key->cert->principals = oprincipals;
2219: ret = SSH_ERR_ALLOC_FAIL;
2220: goto out;
2221: }
2222: key->cert->principals[key->cert->nprincipals++] = principal;
2223: }
2224:
1.4 djm 2225: /*
2226: * Stash a copies of the critical options and extensions sections
2227: * for later use.
2228: */
2229: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2230: (exts != NULL &&
2231: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2232: goto out;
2233:
1.4 djm 2234: /*
2235: * Validate critical options and extensions sections format.
2236: */
2237: while (sshbuf_len(crit) != 0) {
2238: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2239: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2240: sshbuf_reset(key->cert->critical);
1.1 djm 2241: ret = SSH_ERR_INVALID_FORMAT;
2242: goto out;
2243: }
2244: }
1.4 djm 2245: while (exts != NULL && sshbuf_len(exts) != 0) {
2246: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2247: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2248: sshbuf_reset(key->cert->extensions);
1.1 djm 2249: ret = SSH_ERR_INVALID_FORMAT;
2250: goto out;
2251: }
2252: }
2253:
1.4 djm 2254: /* Parse CA key and check signature */
1.14 djm 2255: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2256: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2257: goto out;
2258: }
2259: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2260: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2261: goto out;
2262: }
2263: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 2264: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 2265: goto out;
1.82 djm 2266: if ((ret = sshkey_get_sigtype(sig, slen,
2267: &key->cert->signature_type)) != 0)
1.67 djm 2268: goto out;
1.4 djm 2269:
2270: /* Success */
1.1 djm 2271: ret = 0;
2272: out:
1.14 djm 2273: sshbuf_free(ca);
1.4 djm 2274: sshbuf_free(crit);
2275: sshbuf_free(exts);
2276: sshbuf_free(principals);
1.1 djm 2277: free(sig);
2278: return ret;
2279: }
2280:
1.83 djm 2281: #ifdef WITH_OPENSSL
1.1 djm 2282: static int
1.69 djm 2283: check_rsa_length(const RSA *rsa)
2284: {
2285: const BIGNUM *rsa_n;
2286:
2287: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2288: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2289: return SSH_ERR_KEY_LENGTH;
2290: return 0;
2291: }
1.83 djm 2292: #endif /* WITH_OPENSSL */
1.69 djm 2293:
2294: static int
1.14 djm 2295: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2296: int allow_cert)
1.1 djm 2297: {
1.12 djm 2298: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2299: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2300: struct sshkey *key = NULL;
2301: size_t len;
2302: u_char *pk = NULL;
1.14 djm 2303: struct sshbuf *copy;
1.1 djm 2304: #ifdef WITH_OPENSSL
2305: EC_POINT *q = NULL;
1.69 djm 2306: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2307: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2308: #endif /* WITH_OPENSSL */
2309:
2310: #ifdef DEBUG_PK /* XXX */
1.14 djm 2311: sshbuf_dump(b, stderr);
1.1 djm 2312: #endif
1.32 djm 2313: if (keyp != NULL)
2314: *keyp = NULL;
1.14 djm 2315: if ((copy = sshbuf_fromb(b)) == NULL) {
2316: ret = SSH_ERR_ALLOC_FAIL;
2317: goto out;
2318: }
1.1 djm 2319: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2320: ret = SSH_ERR_INVALID_FORMAT;
2321: goto out;
2322: }
2323:
2324: type = sshkey_type_from_name(ktype);
2325: if (!allow_cert && sshkey_type_is_cert(type)) {
2326: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2327: goto out;
2328: }
2329: switch (type) {
2330: #ifdef WITH_OPENSSL
2331: case KEY_RSA_CERT:
1.14 djm 2332: /* Skip nonce */
1.1 djm 2333: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2334: ret = SSH_ERR_INVALID_FORMAT;
2335: goto out;
2336: }
2337: /* FALLTHROUGH */
2338: case KEY_RSA:
2339: if ((key = sshkey_new(type)) == NULL) {
2340: ret = SSH_ERR_ALLOC_FAIL;
2341: goto out;
2342: }
1.73 djm 2343: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2344: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2345: ret = SSH_ERR_INVALID_FORMAT;
2346: goto out;
2347: }
1.69 djm 2348: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2349: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2350: goto out;
2351: }
1.69 djm 2352: rsa_n = rsa_e = NULL; /* transferred */
2353: if ((ret = check_rsa_length(key->rsa)) != 0)
2354: goto out;
1.1 djm 2355: #ifdef DEBUG_PK
2356: RSA_print_fp(stderr, key->rsa, 8);
2357: #endif
2358: break;
2359: case KEY_DSA_CERT:
1.14 djm 2360: /* Skip nonce */
1.1 djm 2361: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2362: ret = SSH_ERR_INVALID_FORMAT;
2363: goto out;
2364: }
2365: /* FALLTHROUGH */
2366: case KEY_DSA:
2367: if ((key = sshkey_new(type)) == NULL) {
2368: ret = SSH_ERR_ALLOC_FAIL;
2369: goto out;
2370: }
1.73 djm 2371: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2372: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2373: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2374: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2375: ret = SSH_ERR_INVALID_FORMAT;
2376: goto out;
2377: }
1.69 djm 2378: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2379: ret = SSH_ERR_LIBCRYPTO_ERROR;
2380: goto out;
2381: }
2382: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2383: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2384: ret = SSH_ERR_LIBCRYPTO_ERROR;
2385: goto out;
2386: }
2387: dsa_pub_key = NULL; /* transferred */
1.1 djm 2388: #ifdef DEBUG_PK
2389: DSA_print_fp(stderr, key->dsa, 8);
2390: #endif
2391: break;
2392: case KEY_ECDSA_CERT:
1.85 djm 2393: case KEY_ECDSA_SK_CERT:
1.14 djm 2394: /* Skip nonce */
1.1 djm 2395: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2396: ret = SSH_ERR_INVALID_FORMAT;
2397: goto out;
2398: }
2399: /* FALLTHROUGH */
2400: case KEY_ECDSA:
1.85 djm 2401: case KEY_ECDSA_SK:
1.1 djm 2402: if ((key = sshkey_new(type)) == NULL) {
2403: ret = SSH_ERR_ALLOC_FAIL;
2404: goto out;
2405: }
1.12 djm 2406: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2407: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2408: ret = SSH_ERR_INVALID_FORMAT;
2409: goto out;
2410: }
2411: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2412: ret = SSH_ERR_EC_CURVE_MISMATCH;
2413: goto out;
2414: }
1.60 jsing 2415: EC_KEY_free(key->ecdsa);
1.1 djm 2416: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2417: == NULL) {
2418: ret = SSH_ERR_EC_CURVE_INVALID;
2419: goto out;
2420: }
2421: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2422: ret = SSH_ERR_ALLOC_FAIL;
2423: goto out;
2424: }
2425: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2426: ret = SSH_ERR_INVALID_FORMAT;
2427: goto out;
2428: }
2429: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2430: q) != 0) {
2431: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2432: goto out;
2433: }
2434: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2435: /* XXX assume it is a allocation error */
2436: ret = SSH_ERR_ALLOC_FAIL;
2437: goto out;
2438: }
2439: #ifdef DEBUG_PK
2440: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2441: #endif
1.85 djm 2442: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2443: /* Parse additional security-key application string */
2444: if (sshbuf_get_cstring(b, &key->sk_application,
2445: NULL) != 0) {
2446: ret = SSH_ERR_INVALID_FORMAT;
2447: goto out;
2448: }
2449: #ifdef DEBUG_PK
2450: fprintf(stderr, "App: %s\n", key->sk_application);
2451: #endif
2452: }
1.1 djm 2453: break;
2454: #endif /* WITH_OPENSSL */
2455: case KEY_ED25519_CERT:
1.90 markus 2456: case KEY_ED25519_SK_CERT:
1.14 djm 2457: /* Skip nonce */
1.1 djm 2458: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2459: ret = SSH_ERR_INVALID_FORMAT;
2460: goto out;
2461: }
2462: /* FALLTHROUGH */
2463: case KEY_ED25519:
1.90 markus 2464: case KEY_ED25519_SK:
1.1 djm 2465: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2466: goto out;
2467: if (len != ED25519_PK_SZ) {
2468: ret = SSH_ERR_INVALID_FORMAT;
2469: goto out;
2470: }
2471: if ((key = sshkey_new(type)) == NULL) {
2472: ret = SSH_ERR_ALLOC_FAIL;
2473: goto out;
2474: }
1.90 markus 2475: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2476: /* Parse additional security-key application string */
2477: if (sshbuf_get_cstring(b, &key->sk_application,
2478: NULL) != 0) {
2479: ret = SSH_ERR_INVALID_FORMAT;
2480: goto out;
2481: }
2482: #ifdef DEBUG_PK
2483: fprintf(stderr, "App: %s\n", key->sk_application);
2484: #endif
2485: }
1.1 djm 2486: key->ed25519_pk = pk;
2487: pk = NULL;
2488: break;
1.62 markus 2489: #ifdef WITH_XMSS
2490: case KEY_XMSS_CERT:
2491: /* Skip nonce */
2492: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2493: ret = SSH_ERR_INVALID_FORMAT;
2494: goto out;
2495: }
2496: /* FALLTHROUGH */
2497: case KEY_XMSS:
2498: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2499: goto out;
2500: if ((key = sshkey_new(type)) == NULL) {
2501: ret = SSH_ERR_ALLOC_FAIL;
2502: goto out;
2503: }
2504: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2505: goto out;
2506: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2507: goto out;
2508: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2509: ret = SSH_ERR_INVALID_FORMAT;
2510: goto out;
2511: }
2512: key->xmss_pk = pk;
2513: pk = NULL;
2514: if (type != KEY_XMSS_CERT &&
2515: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2516: goto out;
2517: break;
2518: #endif /* WITH_XMSS */
1.1 djm 2519: case KEY_UNSPEC:
2520: default:
2521: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2522: goto out;
2523: }
2524:
2525: /* Parse certificate potion */
1.14 djm 2526: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2527: goto out;
2528:
2529: if (key != NULL && sshbuf_len(b) != 0) {
2530: ret = SSH_ERR_INVALID_FORMAT;
2531: goto out;
2532: }
2533: ret = 0;
1.32 djm 2534: if (keyp != NULL) {
2535: *keyp = key;
2536: key = NULL;
2537: }
1.1 djm 2538: out:
1.14 djm 2539: sshbuf_free(copy);
1.1 djm 2540: sshkey_free(key);
1.62 markus 2541: free(xmss_name);
1.1 djm 2542: free(ktype);
2543: free(curve);
2544: free(pk);
2545: #ifdef WITH_OPENSSL
1.60 jsing 2546: EC_POINT_free(q);
1.69 djm 2547: BN_clear_free(rsa_n);
2548: BN_clear_free(rsa_e);
2549: BN_clear_free(dsa_p);
2550: BN_clear_free(dsa_q);
2551: BN_clear_free(dsa_g);
2552: BN_clear_free(dsa_pub_key);
1.1 djm 2553: #endif /* WITH_OPENSSL */
2554: return ret;
2555: }
2556:
2557: int
2558: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2559: {
1.14 djm 2560: struct sshbuf *b;
2561: int r;
2562:
2563: if ((b = sshbuf_from(blob, blen)) == NULL)
2564: return SSH_ERR_ALLOC_FAIL;
2565: r = sshkey_from_blob_internal(b, keyp, 1);
2566: sshbuf_free(b);
2567: return r;
2568: }
2569:
2570: int
2571: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2572: {
2573: return sshkey_from_blob_internal(b, keyp, 1);
2574: }
2575:
2576: int
2577: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2578: {
2579: struct sshbuf *b;
2580: int r;
2581:
2582: if ((r = sshbuf_froms(buf, &b)) != 0)
2583: return r;
2584: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2585: sshbuf_free(b);
2586: return r;
2587: }
2588:
1.82 djm 2589: int
2590: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2591: {
2592: int r;
2593: struct sshbuf *b = NULL;
2594: char *sigtype = NULL;
2595:
2596: if (sigtypep != NULL)
2597: *sigtypep = NULL;
2598: if ((b = sshbuf_from(sig, siglen)) == NULL)
2599: return SSH_ERR_ALLOC_FAIL;
2600: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2601: goto out;
2602: /* success */
2603: if (sigtypep != NULL) {
2604: *sigtypep = sigtype;
2605: sigtype = NULL;
2606: }
2607: r = 0;
2608: out:
2609: free(sigtype);
1.14 djm 2610: sshbuf_free(b);
2611: return r;
1.68 djm 2612: }
2613:
2614: /*
2615: *
2616: * Checks whether a certificate's signature type is allowed.
2617: * Returns 0 (success) if the certificate signature type appears in the
2618: * "allowed" pattern-list, or the key is not a certificate to begin with.
2619: * Otherwise returns a ssherr.h code.
2620: */
2621: int
2622: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2623: {
2624: if (key == NULL || allowed == NULL)
2625: return SSH_ERR_INVALID_ARGUMENT;
2626: if (!sshkey_type_is_cert(key->type))
2627: return 0;
2628: if (key->cert == NULL || key->cert->signature_type == NULL)
2629: return SSH_ERR_INVALID_ARGUMENT;
2630: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2631: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2632: return 0;
1.65 djm 2633: }
2634:
2635: /*
2636: * Returns the expected signature algorithm for a given public key algorithm.
2637: */
1.66 djm 2638: const char *
2639: sshkey_sigalg_by_name(const char *name)
1.65 djm 2640: {
2641: const struct keytype *kt;
2642:
2643: for (kt = keytypes; kt->type != -1; kt++) {
2644: if (strcmp(kt->name, name) != 0)
2645: continue;
2646: if (kt->sigalg != NULL)
2647: return kt->sigalg;
2648: if (!kt->cert)
2649: return kt->name;
2650: return sshkey_ssh_name_from_type_nid(
2651: sshkey_type_plain(kt->type), kt->nid);
2652: }
2653: return NULL;
2654: }
2655:
2656: /*
2657: * Verifies that the signature algorithm appearing inside the signature blob
2658: * matches that which was requested.
2659: */
2660: int
2661: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2662: const char *requested_alg)
2663: {
2664: const char *expected_alg;
2665: char *sigtype = NULL;
2666: int r;
2667:
2668: if (requested_alg == NULL)
2669: return 0;
1.66 djm 2670: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2671: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2672: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2673: return r;
2674: r = strcmp(expected_alg, sigtype) == 0;
2675: free(sigtype);
2676: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2677: }
2678:
2679: int
1.76 djm 2680: sshkey_sign(struct sshkey *key,
1.1 djm 2681: u_char **sigp, size_t *lenp,
1.86 djm 2682: const u_char *data, size_t datalen,
2683: const char *alg, const char *sk_provider, u_int compat)
1.1 djm 2684: {
1.76 djm 2685: int was_shielded = sshkey_is_shielded(key);
2686: int r2, r = SSH_ERR_INTERNAL_ERROR;
2687:
1.1 djm 2688: if (sigp != NULL)
2689: *sigp = NULL;
2690: if (lenp != NULL)
2691: *lenp = 0;
2692: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2693: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2694: if ((r = sshkey_unshield_private(key)) != 0)
2695: return r;
1.1 djm 2696: switch (key->type) {
2697: #ifdef WITH_OPENSSL
2698: case KEY_DSA_CERT:
2699: case KEY_DSA:
1.76 djm 2700: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2701: break;
1.1 djm 2702: case KEY_ECDSA_CERT:
2703: case KEY_ECDSA:
1.76 djm 2704: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2705: break;
1.1 djm 2706: case KEY_RSA_CERT:
2707: case KEY_RSA:
1.76 djm 2708: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2709: break;
1.1 djm 2710: #endif /* WITH_OPENSSL */
2711: case KEY_ED25519:
2712: case KEY_ED25519_CERT:
1.76 djm 2713: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2714: break;
2715: case KEY_ED25519_SK:
2716: case KEY_ED25519_SK_CERT:
1.97 djm 2717: case KEY_ECDSA_SK_CERT:
2718: case KEY_ECDSA_SK:
2719: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.98 djm 2720: datalen, compat, /* XXX PIN */ NULL);
1.76 djm 2721: break;
1.62 markus 2722: #ifdef WITH_XMSS
2723: case KEY_XMSS:
2724: case KEY_XMSS_CERT:
1.76 djm 2725: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2726: break;
1.62 markus 2727: #endif /* WITH_XMSS */
1.1 djm 2728: default:
1.76 djm 2729: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2730: break;
1.1 djm 2731: }
1.76 djm 2732: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2733: return r2;
2734: return r;
1.1 djm 2735: }
2736:
2737: /*
2738: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2739: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2740: */
2741: int
2742: sshkey_verify(const struct sshkey *key,
2743: const u_char *sig, size_t siglen,
1.96 djm 2744: const u_char *data, size_t dlen, const char *alg, u_int compat,
2745: struct sshkey_sig_details **detailsp)
1.1 djm 2746: {
1.96 djm 2747: if (detailsp != NULL)
2748: *detailsp = NULL;
1.6 djm 2749: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2750: return SSH_ERR_INVALID_ARGUMENT;
2751: switch (key->type) {
2752: #ifdef WITH_OPENSSL
2753: case KEY_DSA_CERT:
2754: case KEY_DSA:
2755: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2756: case KEY_ECDSA_CERT:
2757: case KEY_ECDSA:
2758: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2759: case KEY_ECDSA_SK_CERT:
2760: case KEY_ECDSA_SK:
2761: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2762: compat, detailsp);
1.1 djm 2763: case KEY_RSA_CERT:
2764: case KEY_RSA:
1.59 djm 2765: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2766: #endif /* WITH_OPENSSL */
2767: case KEY_ED25519:
2768: case KEY_ED25519_CERT:
2769: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2770: case KEY_ED25519_SK:
2771: case KEY_ED25519_SK_CERT:
2772: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2773: compat, detailsp);
1.62 markus 2774: #ifdef WITH_XMSS
2775: case KEY_XMSS:
2776: case KEY_XMSS_CERT:
2777: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2778: #endif /* WITH_XMSS */
1.1 djm 2779: default:
2780: return SSH_ERR_KEY_TYPE_UNKNOWN;
2781: }
2782: }
2783:
2784: /* Convert a plain key to their _CERT equivalent */
2785: int
1.20 djm 2786: sshkey_to_certified(struct sshkey *k)
1.1 djm 2787: {
2788: int newtype;
2789:
2790: switch (k->type) {
2791: #ifdef WITH_OPENSSL
2792: case KEY_RSA:
1.20 djm 2793: newtype = KEY_RSA_CERT;
1.1 djm 2794: break;
2795: case KEY_DSA:
1.20 djm 2796: newtype = KEY_DSA_CERT;
1.1 djm 2797: break;
2798: case KEY_ECDSA:
2799: newtype = KEY_ECDSA_CERT;
2800: break;
1.85 djm 2801: case KEY_ECDSA_SK:
2802: newtype = KEY_ECDSA_SK_CERT;
2803: break;
1.1 djm 2804: #endif /* WITH_OPENSSL */
1.90 markus 2805: case KEY_ED25519_SK:
2806: newtype = KEY_ED25519_SK_CERT;
2807: break;
1.1 djm 2808: case KEY_ED25519:
2809: newtype = KEY_ED25519_CERT;
2810: break;
1.62 markus 2811: #ifdef WITH_XMSS
2812: case KEY_XMSS:
2813: newtype = KEY_XMSS_CERT;
2814: break;
2815: #endif /* WITH_XMSS */
1.1 djm 2816: default:
2817: return SSH_ERR_INVALID_ARGUMENT;
2818: }
2819: if ((k->cert = cert_new()) == NULL)
2820: return SSH_ERR_ALLOC_FAIL;
2821: k->type = newtype;
2822: return 0;
2823: }
2824:
2825: /* Convert a certificate to its raw key equivalent */
2826: int
2827: sshkey_drop_cert(struct sshkey *k)
2828: {
2829: if (!sshkey_type_is_cert(k->type))
2830: return SSH_ERR_KEY_TYPE_UNKNOWN;
2831: cert_free(k->cert);
2832: k->cert = NULL;
2833: k->type = sshkey_type_plain(k->type);
2834: return 0;
2835: }
2836:
2837: /* Sign a certified key, (re-)generating the signed certblob. */
2838: int
1.53 djm 2839: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.86 djm 2840: const char *sk_provider, sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2841: {
2842: struct sshbuf *principals = NULL;
2843: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2844: size_t i, ca_len, sig_len;
2845: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2846: struct sshbuf *cert = NULL;
2847: char *sigtype = NULL;
1.69 djm 2848: #ifdef WITH_OPENSSL
2849: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2850: #endif /* WITH_OPENSSL */
1.1 djm 2851:
2852: if (k == NULL || k->cert == NULL ||
2853: k->cert->certblob == NULL || ca == NULL)
2854: return SSH_ERR_INVALID_ARGUMENT;
2855: if (!sshkey_is_cert(k))
2856: return SSH_ERR_KEY_TYPE_UNKNOWN;
2857: if (!sshkey_type_is_valid_ca(ca->type))
2858: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2859:
1.67 djm 2860: /*
2861: * If no alg specified as argument but a signature_type was set,
2862: * then prefer that. If both were specified, then they must match.
2863: */
2864: if (alg == NULL)
2865: alg = k->cert->signature_type;
2866: else if (k->cert->signature_type != NULL &&
2867: strcmp(alg, k->cert->signature_type) != 0)
2868: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2869:
2870: /*
2871: * If no signing algorithm or signature_type was specified and we're
2872: * using a RSA key, then default to a good signature algorithm.
2873: */
2874: if (alg == NULL && ca->type == KEY_RSA)
2875: alg = "rsa-sha2-512";
1.67 djm 2876:
1.1 djm 2877: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2878: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2879:
2880: cert = k->cert->certblob; /* for readability */
2881: sshbuf_reset(cert);
2882: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2883: goto out;
2884:
2885: /* -v01 certs put nonce first */
2886: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2887: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2888: goto out;
1.1 djm 2889:
2890: /* XXX this substantially duplicates to_blob(); refactor */
2891: switch (k->type) {
2892: #ifdef WITH_OPENSSL
2893: case KEY_DSA_CERT:
1.69 djm 2894: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2895: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2896: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2897: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2898: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2899: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2900: goto out;
2901: break;
2902: case KEY_ECDSA_CERT:
1.85 djm 2903: case KEY_ECDSA_SK_CERT:
1.1 djm 2904: if ((ret = sshbuf_put_cstring(cert,
2905: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2906: (ret = sshbuf_put_ec(cert,
2907: EC_KEY_get0_public_key(k->ecdsa),
2908: EC_KEY_get0_group(k->ecdsa))) != 0)
2909: goto out;
1.85 djm 2910: if (k->type == KEY_ECDSA_SK_CERT) {
2911: if ((ret = sshbuf_put_cstring(cert,
2912: k->sk_application)) != 0)
2913: goto out;
2914: }
1.1 djm 2915: break;
2916: case KEY_RSA_CERT:
1.69 djm 2917: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2918: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2919: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2920: goto out;
2921: break;
2922: #endif /* WITH_OPENSSL */
2923: case KEY_ED25519_CERT:
1.94 djm 2924: case KEY_ED25519_SK_CERT:
1.1 djm 2925: if ((ret = sshbuf_put_string(cert,
2926: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2927: goto out;
1.94 djm 2928: if (k->type == KEY_ED25519_SK_CERT) {
2929: if ((ret = sshbuf_put_cstring(cert,
2930: k->sk_application)) != 0)
2931: goto out;
2932: }
1.1 djm 2933: break;
1.62 markus 2934: #ifdef WITH_XMSS
2935: case KEY_XMSS_CERT:
2936: if (k->xmss_name == NULL) {
2937: ret = SSH_ERR_INVALID_ARGUMENT;
2938: goto out;
2939: }
2940: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2941: (ret = sshbuf_put_string(cert,
2942: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2943: goto out;
2944: break;
2945: #endif /* WITH_XMSS */
1.1 djm 2946: default:
2947: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2948: goto out;
1.1 djm 2949: }
2950:
1.20 djm 2951: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2952: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2953: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2954: goto out;
2955:
2956: if ((principals = sshbuf_new()) == NULL) {
2957: ret = SSH_ERR_ALLOC_FAIL;
2958: goto out;
2959: }
2960: for (i = 0; i < k->cert->nprincipals; i++) {
2961: if ((ret = sshbuf_put_cstring(principals,
2962: k->cert->principals[i])) != 0)
2963: goto out;
2964: }
2965: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2966: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2967: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2968: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2969: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2970: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2971: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2972: goto out;
2973:
2974: /* Sign the whole mess */
1.53 djm 2975: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.86 djm 2976: sshbuf_len(cert), alg, sk_provider, 0, signer_ctx)) != 0)
1.1 djm 2977: goto out;
1.67 djm 2978: /* Check and update signature_type against what was actually used */
1.82 djm 2979: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2980: goto out;
2981: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2982: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2983: goto out;
2984: }
2985: if (k->cert->signature_type == NULL) {
2986: k->cert->signature_type = sigtype;
2987: sigtype = NULL;
2988: }
1.1 djm 2989: /* Append signature and we are done */
2990: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2991: goto out;
2992: ret = 0;
2993: out:
2994: if (ret != 0)
2995: sshbuf_reset(cert);
1.29 mmcc 2996: free(sig_blob);
2997: free(ca_blob);
1.67 djm 2998: free(sigtype);
1.31 mmcc 2999: sshbuf_free(principals);
1.1 djm 3000: return ret;
1.53 djm 3001: }
3002:
3003: static int
1.76 djm 3004: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 3005: const u_char *data, size_t datalen,
1.86 djm 3006: const char *alg, const char *sk_provider, u_int compat, void *ctx)
1.53 djm 3007: {
3008: if (ctx != NULL)
3009: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 3010: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
3011: sk_provider, compat);
1.53 djm 3012: }
3013:
3014: int
1.86 djm 3015: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
3016: const char *sk_provider)
1.53 djm 3017: {
1.86 djm 3018: return sshkey_certify_custom(k, ca, alg, sk_provider,
3019: default_key_sign, NULL);
1.1 djm 3020: }
3021:
3022: int
3023: sshkey_cert_check_authority(const struct sshkey *k,
3024: int want_host, int require_principal,
3025: const char *name, const char **reason)
3026: {
3027: u_int i, principal_matches;
3028: time_t now = time(NULL);
3029:
1.102 markus 3030: if (reason == NULL)
3031: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 3032:
3033: if (want_host) {
3034: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
3035: *reason = "Certificate invalid: not a host certificate";
3036: return SSH_ERR_KEY_CERT_INVALID;
3037: }
3038: } else {
3039: if (k->cert->type != SSH2_CERT_TYPE_USER) {
3040: *reason = "Certificate invalid: not a user certificate";
3041: return SSH_ERR_KEY_CERT_INVALID;
3042: }
3043: }
3044: if (now < 0) {
3045: /* yikes - system clock before epoch! */
3046: *reason = "Certificate invalid: not yet valid";
3047: return SSH_ERR_KEY_CERT_INVALID;
3048: }
3049: if ((u_int64_t)now < k->cert->valid_after) {
3050: *reason = "Certificate invalid: not yet valid";
3051: return SSH_ERR_KEY_CERT_INVALID;
3052: }
3053: if ((u_int64_t)now >= k->cert->valid_before) {
3054: *reason = "Certificate invalid: expired";
3055: return SSH_ERR_KEY_CERT_INVALID;
3056: }
3057: if (k->cert->nprincipals == 0) {
3058: if (require_principal) {
3059: *reason = "Certificate lacks principal list";
3060: return SSH_ERR_KEY_CERT_INVALID;
3061: }
3062: } else if (name != NULL) {
3063: principal_matches = 0;
3064: for (i = 0; i < k->cert->nprincipals; i++) {
3065: if (strcmp(name, k->cert->principals[i]) == 0) {
3066: principal_matches = 1;
3067: break;
3068: }
3069: }
3070: if (!principal_matches) {
3071: *reason = "Certificate invalid: name is not a listed "
3072: "principal";
3073: return SSH_ERR_KEY_CERT_INVALID;
3074: }
3075: }
3076: return 0;
1.27 djm 3077: }
3078:
3079: size_t
3080: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
3081: {
3082: char from[32], to[32], ret[64];
3083: time_t tt;
3084: struct tm *tm;
3085:
3086: *from = *to = '\0';
3087: if (cert->valid_after == 0 &&
3088: cert->valid_before == 0xffffffffffffffffULL)
3089: return strlcpy(s, "forever", l);
3090:
3091: if (cert->valid_after != 0) {
3092: /* XXX revisit INT_MAX in 2038 :) */
3093: tt = cert->valid_after > INT_MAX ?
3094: INT_MAX : cert->valid_after;
3095: tm = localtime(&tt);
3096: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
3097: }
3098: if (cert->valid_before != 0xffffffffffffffffULL) {
3099: /* XXX revisit INT_MAX in 2038 :) */
3100: tt = cert->valid_before > INT_MAX ?
3101: INT_MAX : cert->valid_before;
3102: tm = localtime(&tt);
3103: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
3104: }
3105:
3106: if (cert->valid_after == 0)
3107: snprintf(ret, sizeof(ret), "before %s", to);
3108: else if (cert->valid_before == 0xffffffffffffffffULL)
3109: snprintf(ret, sizeof(ret), "after %s", from);
3110: else
3111: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
3112:
3113: return strlcpy(s, ret, l);
1.1 djm 3114: }
3115:
3116: int
1.76 djm 3117: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 3118: enum sshkey_serialize_rep opts)
1.1 djm 3119: {
3120: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 3121: int was_shielded = sshkey_is_shielded(key);
3122: struct sshbuf *b = NULL;
1.69 djm 3123: #ifdef WITH_OPENSSL
3124: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
3125: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
3126: #endif /* WITH_OPENSSL */
1.1 djm 3127:
1.76 djm 3128: if ((r = sshkey_unshield_private(key)) != 0)
3129: return r;
3130: if ((b = sshbuf_new()) == NULL)
3131: return SSH_ERR_ALLOC_FAIL;
1.1 djm 3132: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
3133: goto out;
3134: switch (key->type) {
3135: #ifdef WITH_OPENSSL
3136: case KEY_RSA:
1.69 djm 3137: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
3138: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3139: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
3140: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
3141: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
3142: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3143: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3144: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3145: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3146: goto out;
3147: break;
3148: case KEY_RSA_CERT:
3149: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3150: r = SSH_ERR_INVALID_ARGUMENT;
3151: goto out;
3152: }
1.69 djm 3153: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
3154: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3155: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 3156: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3157: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3158: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3159: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3160: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3161: goto out;
3162: break;
3163: case KEY_DSA:
1.69 djm 3164: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
3165: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
3166: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
3167: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
3168: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
3169: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3170: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3171: goto out;
3172: break;
3173: case KEY_DSA_CERT:
3174: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3175: r = SSH_ERR_INVALID_ARGUMENT;
3176: goto out;
3177: }
1.69 djm 3178: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3179: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3180: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3181: goto out;
3182: break;
3183: case KEY_ECDSA:
3184: if ((r = sshbuf_put_cstring(b,
3185: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3186: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3187: (r = sshbuf_put_bignum2(b,
3188: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3189: goto out;
3190: break;
3191: case KEY_ECDSA_CERT:
3192: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3193: r = SSH_ERR_INVALID_ARGUMENT;
3194: goto out;
3195: }
3196: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3197: (r = sshbuf_put_bignum2(b,
3198: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3199: goto out;
3200: break;
1.85 djm 3201: case KEY_ECDSA_SK:
3202: if ((r = sshbuf_put_cstring(b,
3203: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3204: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3205: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3206: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3207: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3208: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3209: goto out;
3210: break;
3211: case KEY_ECDSA_SK_CERT:
3212: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3213: r = SSH_ERR_INVALID_ARGUMENT;
3214: goto out;
3215: }
3216: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3217: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3218: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3219: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3220: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3221: goto out;
3222: break;
1.1 djm 3223: #endif /* WITH_OPENSSL */
3224: case KEY_ED25519:
3225: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3226: ED25519_PK_SZ)) != 0 ||
3227: (r = sshbuf_put_string(b, key->ed25519_sk,
3228: ED25519_SK_SZ)) != 0)
3229: goto out;
3230: break;
3231: case KEY_ED25519_CERT:
3232: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3233: r = SSH_ERR_INVALID_ARGUMENT;
3234: goto out;
3235: }
3236: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3237: (r = sshbuf_put_string(b, key->ed25519_pk,
3238: ED25519_PK_SZ)) != 0 ||
3239: (r = sshbuf_put_string(b, key->ed25519_sk,
3240: ED25519_SK_SZ)) != 0)
3241: goto out;
3242: break;
1.90 markus 3243: case KEY_ED25519_SK:
3244: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3245: ED25519_PK_SZ)) != 0 ||
3246: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3247: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3248: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3249: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3250: goto out;
3251: break;
3252: case KEY_ED25519_SK_CERT:
3253: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3254: r = SSH_ERR_INVALID_ARGUMENT;
3255: goto out;
3256: }
3257: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3258: (r = sshbuf_put_string(b, key->ed25519_pk,
3259: ED25519_PK_SZ)) != 0 ||
3260: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3261: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3262: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3263: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3264: goto out;
3265: break;
1.62 markus 3266: #ifdef WITH_XMSS
3267: case KEY_XMSS:
3268: if (key->xmss_name == NULL) {
3269: r = SSH_ERR_INVALID_ARGUMENT;
3270: goto out;
3271: }
3272: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3273: (r = sshbuf_put_string(b, key->xmss_pk,
3274: sshkey_xmss_pklen(key))) != 0 ||
3275: (r = sshbuf_put_string(b, key->xmss_sk,
3276: sshkey_xmss_sklen(key))) != 0 ||
3277: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3278: goto out;
3279: break;
3280: case KEY_XMSS_CERT:
3281: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3282: key->xmss_name == NULL) {
3283: r = SSH_ERR_INVALID_ARGUMENT;
3284: goto out;
3285: }
3286: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3287: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3288: (r = sshbuf_put_string(b, key->xmss_pk,
3289: sshkey_xmss_pklen(key))) != 0 ||
3290: (r = sshbuf_put_string(b, key->xmss_sk,
3291: sshkey_xmss_sklen(key))) != 0 ||
3292: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3293: goto out;
3294: break;
3295: #endif /* WITH_XMSS */
1.1 djm 3296: default:
3297: r = SSH_ERR_INVALID_ARGUMENT;
3298: goto out;
3299: }
1.76 djm 3300: /*
3301: * success (but we still need to append the output to buf after
3302: * possibly re-shielding the private key)
3303: */
1.1 djm 3304: r = 0;
3305: out:
1.76 djm 3306: if (was_shielded)
3307: r = sshkey_shield_private(key);
3308: if (r == 0)
3309: r = sshbuf_putb(buf, b);
3310: sshbuf_free(b);
3311:
1.1 djm 3312: return r;
3313: }
3314:
3315: int
1.76 djm 3316: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3317: {
3318: return sshkey_private_serialize_opt(key, b,
3319: SSHKEY_SERIALIZE_DEFAULT);
3320: }
3321:
3322: int
1.1 djm 3323: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3324: {
1.62 markus 3325: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3326: struct sshkey *k = NULL;
1.14 djm 3327: size_t pklen = 0, sklen = 0;
1.1 djm 3328: int type, r = SSH_ERR_INTERNAL_ERROR;
3329: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3330: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3331: #ifdef WITH_OPENSSL
3332: BIGNUM *exponent = NULL;
1.69 djm 3333: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3334: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3335: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3336: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3337: #endif /* WITH_OPENSSL */
3338:
3339: if (kp != NULL)
3340: *kp = NULL;
3341: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3342: goto out;
3343: type = sshkey_type_from_name(tname);
3344: switch (type) {
3345: #ifdef WITH_OPENSSL
3346: case KEY_DSA:
1.70 djm 3347: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3348: r = SSH_ERR_ALLOC_FAIL;
3349: goto out;
3350: }
1.73 djm 3351: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3352: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3353: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3354: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3355: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3356: goto out;
3357: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3358: r = SSH_ERR_LIBCRYPTO_ERROR;
3359: goto out;
3360: }
3361: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3362: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3363: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3364: goto out;
1.69 djm 3365: }
3366: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3367: break;
3368: case KEY_DSA_CERT:
1.14 djm 3369: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3370: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3371: goto out;
1.84 djm 3372: if (k->type != type) {
3373: r = SSH_ERR_INVALID_FORMAT;
3374: goto out;
3375: }
1.69 djm 3376: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3377: r = SSH_ERR_LIBCRYPTO_ERROR;
3378: goto out;
3379: }
3380: dsa_priv_key = NULL; /* transferred */
1.1 djm 3381: break;
3382: case KEY_ECDSA:
1.70 djm 3383: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3384: r = SSH_ERR_ALLOC_FAIL;
3385: goto out;
3386: }
3387: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3388: r = SSH_ERR_INVALID_ARGUMENT;
3389: goto out;
3390: }
3391: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3392: goto out;
3393: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3394: r = SSH_ERR_EC_CURVE_MISMATCH;
3395: goto out;
3396: }
3397: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3398: if (k->ecdsa == NULL) {
1.1 djm 3399: r = SSH_ERR_LIBCRYPTO_ERROR;
3400: goto out;
3401: }
3402: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3403: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3404: goto out;
3405: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3406: r = SSH_ERR_LIBCRYPTO_ERROR;
3407: goto out;
3408: }
3409: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3410: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3411: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3412: goto out;
3413: break;
3414: case KEY_ECDSA_CERT:
1.14 djm 3415: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3416: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3417: goto out;
1.84 djm 3418: if (k->type != type ||
3419: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
3420: r = SSH_ERR_INVALID_FORMAT;
3421: goto out;
3422: }
1.1 djm 3423: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3424: r = SSH_ERR_LIBCRYPTO_ERROR;
3425: goto out;
3426: }
3427: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3428: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3429: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3430: goto out;
3431: break;
1.85 djm 3432: case KEY_ECDSA_SK:
3433: if ((k = sshkey_new(type)) == NULL) {
3434: r = SSH_ERR_ALLOC_FAIL;
3435: goto out;
3436: }
3437: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3438: r = SSH_ERR_INVALID_ARGUMENT;
3439: goto out;
3440: }
3441: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3442: goto out;
3443: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3444: r = SSH_ERR_EC_CURVE_MISMATCH;
3445: goto out;
3446: }
3447: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3448: (k->sk_reserved = sshbuf_new()) == NULL) {
3449: r = SSH_ERR_ALLOC_FAIL;
3450: goto out;
3451: }
3452: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3453: if (k->ecdsa == NULL) {
3454: r = SSH_ERR_LIBCRYPTO_ERROR;
3455: goto out;
3456: }
3457: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3458: (r = sshbuf_get_cstring(buf, &k->sk_application,
3459: NULL)) != 0 ||
3460: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3461: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3462: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3463: goto out;
3464: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3465: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3466: goto out;
3467: break;
3468: case KEY_ECDSA_SK_CERT:
3469: if ((r = sshkey_froms(buf, &k)) != 0)
3470: goto out;
3471: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3472: (k->sk_reserved = sshbuf_new()) == NULL) {
3473: r = SSH_ERR_ALLOC_FAIL;
3474: goto out;
3475: }
3476: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3477: NULL)) != 0 ||
3478: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3479: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3480: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3481: goto out;
3482: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3483: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3484: goto out;
3485: break;
1.1 djm 3486: case KEY_RSA:
1.70 djm 3487: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3488: r = SSH_ERR_ALLOC_FAIL;
3489: goto out;
3490: }
1.73 djm 3491: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3492: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3493: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3494: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3495: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3496: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3497: goto out;
1.69 djm 3498: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3499: r = SSH_ERR_LIBCRYPTO_ERROR;
3500: goto out;
3501: }
3502: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3503: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3504: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3505: goto out;
3506: }
1.69 djm 3507: rsa_p = rsa_q = NULL; /* transferred */
3508: if ((r = check_rsa_length(k->rsa)) != 0)
3509: goto out;
3510: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3511: goto out;
1.1 djm 3512: break;
3513: case KEY_RSA_CERT:
1.14 djm 3514: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3515: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3516: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3517: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3518: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3519: goto out;
1.84 djm 3520: if (k->type != type) {
3521: r = SSH_ERR_INVALID_FORMAT;
3522: goto out;
3523: }
1.69 djm 3524: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3525: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3526: goto out;
3527: }
1.69 djm 3528: rsa_d = NULL; /* transferred */
3529: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3530: r = SSH_ERR_LIBCRYPTO_ERROR;
3531: goto out;
3532: }
3533: rsa_p = rsa_q = NULL; /* transferred */
3534: if ((r = check_rsa_length(k->rsa)) != 0)
3535: goto out;
3536: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3537: goto out;
1.1 djm 3538: break;
3539: #endif /* WITH_OPENSSL */
3540: case KEY_ED25519:
1.70 djm 3541: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3542: r = SSH_ERR_ALLOC_FAIL;
3543: goto out;
3544: }
3545: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3546: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3547: goto out;
3548: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3549: r = SSH_ERR_INVALID_FORMAT;
3550: goto out;
3551: }
3552: k->ed25519_pk = ed25519_pk;
3553: k->ed25519_sk = ed25519_sk;
3554: ed25519_pk = ed25519_sk = NULL;
3555: break;
3556: case KEY_ED25519_CERT:
1.14 djm 3557: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3558: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3559: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3560: goto out;
1.84 djm 3561: if (k->type != type) {
3562: r = SSH_ERR_INVALID_FORMAT;
3563: goto out;
3564: }
1.1 djm 3565: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3566: r = SSH_ERR_INVALID_FORMAT;
3567: goto out;
3568: }
3569: k->ed25519_pk = ed25519_pk;
3570: k->ed25519_sk = ed25519_sk;
1.84 djm 3571: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3572: break;
1.90 markus 3573: case KEY_ED25519_SK:
3574: if ((k = sshkey_new(type)) == NULL) {
3575: r = SSH_ERR_ALLOC_FAIL;
3576: goto out;
3577: }
3578: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3579: goto out;
3580: if (pklen != ED25519_PK_SZ) {
3581: r = SSH_ERR_INVALID_FORMAT;
3582: goto out;
3583: }
3584: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3585: (k->sk_reserved = sshbuf_new()) == NULL) {
3586: r = SSH_ERR_ALLOC_FAIL;
3587: goto out;
3588: }
3589: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3590: NULL)) != 0 ||
3591: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3592: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3593: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3594: goto out;
3595: k->ed25519_pk = ed25519_pk;
3596: ed25519_pk = NULL;
3597: break;
3598: case KEY_ED25519_SK_CERT:
3599: if ((r = sshkey_froms(buf, &k)) != 0 ||
3600: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3601: goto out;
3602: if (k->type != type) {
3603: r = SSH_ERR_INVALID_FORMAT;
3604: goto out;
3605: }
3606: if (pklen != ED25519_PK_SZ) {
3607: r = SSH_ERR_INVALID_FORMAT;
3608: goto out;
3609: }
3610: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3611: (k->sk_reserved = sshbuf_new()) == NULL) {
3612: r = SSH_ERR_ALLOC_FAIL;
3613: goto out;
3614: }
3615: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3616: NULL)) != 0 ||
3617: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3618: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3619: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3620: goto out;
3621: k->ed25519_pk = ed25519_pk;
3622: ed25519_pk = NULL; /* transferred */
3623: break;
1.62 markus 3624: #ifdef WITH_XMSS
3625: case KEY_XMSS:
1.70 djm 3626: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3627: r = SSH_ERR_ALLOC_FAIL;
3628: goto out;
3629: }
3630: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3631: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3632: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3633: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3634: goto out;
3635: if (pklen != sshkey_xmss_pklen(k) ||
3636: sklen != sshkey_xmss_sklen(k)) {
3637: r = SSH_ERR_INVALID_FORMAT;
3638: goto out;
3639: }
3640: k->xmss_pk = xmss_pk;
3641: k->xmss_sk = xmss_sk;
3642: xmss_pk = xmss_sk = NULL;
3643: /* optional internal state */
3644: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3645: goto out;
3646: break;
3647: case KEY_XMSS_CERT:
3648: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3649: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3650: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3651: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3652: goto out;
1.84 djm 3653: if (k->type != type || strcmp(xmss_name, k->xmss_name) != 0) {
1.64 markus 3654: r = SSH_ERR_INVALID_FORMAT;
3655: goto out;
3656: }
1.62 markus 3657: if (pklen != sshkey_xmss_pklen(k) ||
3658: sklen != sshkey_xmss_sklen(k)) {
3659: r = SSH_ERR_INVALID_FORMAT;
3660: goto out;
3661: }
3662: k->xmss_pk = xmss_pk;
3663: k->xmss_sk = xmss_sk;
3664: xmss_pk = xmss_sk = NULL;
3665: /* optional internal state */
3666: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3667: goto out;
3668: break;
3669: #endif /* WITH_XMSS */
1.1 djm 3670: default:
3671: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3672: goto out;
3673: }
3674: #ifdef WITH_OPENSSL
3675: /* enable blinding */
3676: switch (k->type) {
3677: case KEY_RSA:
3678: case KEY_RSA_CERT:
3679: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3680: r = SSH_ERR_LIBCRYPTO_ERROR;
3681: goto out;
3682: }
3683: break;
3684: }
3685: #endif /* WITH_OPENSSL */
3686: /* success */
3687: r = 0;
3688: if (kp != NULL) {
3689: *kp = k;
3690: k = NULL;
3691: }
3692: out:
3693: free(tname);
3694: free(curve);
3695: #ifdef WITH_OPENSSL
1.60 jsing 3696: BN_clear_free(exponent);
1.69 djm 3697: BN_clear_free(dsa_p);
3698: BN_clear_free(dsa_q);
3699: BN_clear_free(dsa_g);
3700: BN_clear_free(dsa_pub_key);
3701: BN_clear_free(dsa_priv_key);
3702: BN_clear_free(rsa_n);
3703: BN_clear_free(rsa_e);
3704: BN_clear_free(rsa_d);
3705: BN_clear_free(rsa_p);
3706: BN_clear_free(rsa_q);
3707: BN_clear_free(rsa_iqmp);
1.1 djm 3708: #endif /* WITH_OPENSSL */
3709: sshkey_free(k);
1.61 jsing 3710: freezero(ed25519_pk, pklen);
3711: freezero(ed25519_sk, sklen);
1.62 markus 3712: free(xmss_name);
3713: freezero(xmss_pk, pklen);
3714: freezero(xmss_sk, sklen);
1.1 djm 3715: return r;
3716: }
3717:
3718: #ifdef WITH_OPENSSL
3719: int
3720: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3721: {
3722: EC_POINT *nq = NULL;
1.93 djm 3723: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 3724: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3725:
3726: /*
3727: * NB. This assumes OpenSSL has already verified that the public
3728: * point lies on the curve. This is done by EC_POINT_oct2point()
3729: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3730: * reachable with public points not unmarshalled using
3731: * EC_POINT_oct2point then the caller will need to explicitly check.
3732: */
1.1 djm 3733:
3734: /*
3735: * We shouldn't ever hit this case because bignum_get_ecpoint()
3736: * refuses to load GF2m points.
3737: */
3738: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3739: NID_X9_62_prime_field)
3740: goto out;
3741:
3742: /* Q != infinity */
3743: if (EC_POINT_is_at_infinity(group, public))
3744: goto out;
3745:
1.93 djm 3746: if ((x = BN_new()) == NULL ||
3747: (y = BN_new()) == NULL ||
3748: (order = BN_new()) == NULL ||
3749: (tmp = BN_new()) == NULL) {
1.1 djm 3750: ret = SSH_ERR_ALLOC_FAIL;
3751: goto out;
3752: }
3753:
3754: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 3755: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 3756: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 3757: x, y, NULL) != 1) {
1.1 djm 3758: ret = SSH_ERR_LIBCRYPTO_ERROR;
3759: goto out;
3760: }
3761: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3762: BN_num_bits(y) <= BN_num_bits(order) / 2)
3763: goto out;
3764:
3765: /* nQ == infinity (n == order of subgroup) */
3766: if ((nq = EC_POINT_new(group)) == NULL) {
3767: ret = SSH_ERR_ALLOC_FAIL;
3768: goto out;
3769: }
1.93 djm 3770: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 3771: ret = SSH_ERR_LIBCRYPTO_ERROR;
3772: goto out;
3773: }
3774: if (EC_POINT_is_at_infinity(group, nq) != 1)
3775: goto out;
3776:
3777: /* x < order - 1, y < order - 1 */
3778: if (!BN_sub(tmp, order, BN_value_one())) {
3779: ret = SSH_ERR_LIBCRYPTO_ERROR;
3780: goto out;
3781: }
3782: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3783: goto out;
3784: ret = 0;
3785: out:
1.93 djm 3786: BN_clear_free(x);
3787: BN_clear_free(y);
3788: BN_clear_free(order);
3789: BN_clear_free(tmp);
1.60 jsing 3790: EC_POINT_free(nq);
1.1 djm 3791: return ret;
3792: }
3793:
3794: int
3795: sshkey_ec_validate_private(const EC_KEY *key)
3796: {
1.93 djm 3797: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3798: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3799:
1.93 djm 3800: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3801: ret = SSH_ERR_ALLOC_FAIL;
3802: goto out;
3803: }
3804:
3805: /* log2(private) > log2(order)/2 */
1.93 djm 3806: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3807: ret = SSH_ERR_LIBCRYPTO_ERROR;
3808: goto out;
3809: }
3810: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3811: BN_num_bits(order) / 2)
3812: goto out;
3813:
3814: /* private < order - 1 */
3815: if (!BN_sub(tmp, order, BN_value_one())) {
3816: ret = SSH_ERR_LIBCRYPTO_ERROR;
3817: goto out;
3818: }
3819: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3820: goto out;
3821: ret = 0;
3822: out:
1.93 djm 3823: BN_clear_free(order);
3824: BN_clear_free(tmp);
1.1 djm 3825: return ret;
3826: }
3827:
3828: void
3829: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3830: {
1.93 djm 3831: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3832:
3833: if (point == NULL) {
3834: fputs("point=(NULL)\n", stderr);
3835: return;
3836: }
1.93 djm 3837: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3838: fprintf(stderr, "%s: BN_new failed\n", __func__);
3839: goto out;
1.1 djm 3840: }
3841: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3842: NID_X9_62_prime_field) {
3843: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3844: goto out;
1.1 djm 3845: }
1.93 djm 3846: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3847: x, y, NULL) != 1) {
1.1 djm 3848: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3849: __func__);
1.93 djm 3850: goto out;
1.1 djm 3851: }
3852: fputs("x=", stderr);
3853: BN_print_fp(stderr, x);
3854: fputs("\ny=", stderr);
3855: BN_print_fp(stderr, y);
3856: fputs("\n", stderr);
1.93 djm 3857: out:
3858: BN_clear_free(x);
3859: BN_clear_free(y);
1.1 djm 3860: }
3861:
3862: void
3863: sshkey_dump_ec_key(const EC_KEY *key)
3864: {
3865: const BIGNUM *exponent;
3866:
3867: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3868: EC_KEY_get0_public_key(key));
3869: fputs("exponent=", stderr);
3870: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3871: fputs("(NULL)", stderr);
3872: else
3873: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3874: fputs("\n", stderr);
3875: }
3876: #endif /* WITH_OPENSSL */
3877:
3878: static int
1.76 djm 3879: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3880: const char *passphrase, const char *comment, const char *ciphername,
3881: int rounds)
3882: {
1.4 djm 3883: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3884: u_char salt[SALT_LEN];
1.4 djm 3885: char *b64 = NULL;
1.1 djm 3886: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3887: u_int check;
3888: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3889: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3890: const struct sshcipher *cipher;
3891: const char *kdfname = KDFNAME;
3892: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3893:
3894: if (rounds <= 0)
3895: rounds = DEFAULT_ROUNDS;
3896: if (passphrase == NULL || !strlen(passphrase)) {
3897: ciphername = "none";
3898: kdfname = "none";
3899: } else if (ciphername == NULL)
3900: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3901: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3902: r = SSH_ERR_INVALID_ARGUMENT;
3903: goto out;
3904: }
3905:
3906: if ((kdf = sshbuf_new()) == NULL ||
3907: (encoded = sshbuf_new()) == NULL ||
3908: (encrypted = sshbuf_new()) == NULL) {
3909: r = SSH_ERR_ALLOC_FAIL;
3910: goto out;
3911: }
3912: blocksize = cipher_blocksize(cipher);
3913: keylen = cipher_keylen(cipher);
3914: ivlen = cipher_ivlen(cipher);
3915: authlen = cipher_authlen(cipher);
3916: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3917: r = SSH_ERR_ALLOC_FAIL;
3918: goto out;
3919: }
3920: if (strcmp(kdfname, "bcrypt") == 0) {
3921: arc4random_buf(salt, SALT_LEN);
3922: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3923: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3924: r = SSH_ERR_INVALID_ARGUMENT;
3925: goto out;
3926: }
3927: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3928: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3929: goto out;
3930: } else if (strcmp(kdfname, "none") != 0) {
3931: /* Unsupported KDF type */
3932: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3933: goto out;
3934: }
3935: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3936: key + keylen, ivlen, 1)) != 0)
3937: goto out;
3938:
3939: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3940: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3941: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3942: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3943: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3944: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3945: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3946: goto out;
3947:
3948: /* set up the buffer that will be encrypted */
3949:
3950: /* Random check bytes */
3951: check = arc4random();
3952: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3953: (r = sshbuf_put_u32(encrypted, check)) != 0)
3954: goto out;
3955:
3956: /* append private key and comment*/
1.62 markus 3957: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3958: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3959: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3960: goto out;
3961:
3962: /* padding */
3963: i = 0;
3964: while (sshbuf_len(encrypted) % blocksize) {
3965: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3966: goto out;
3967: }
3968:
3969: /* length in destination buffer */
3970: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3971: goto out;
3972:
3973: /* encrypt */
3974: if ((r = sshbuf_reserve(encoded,
3975: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3976: goto out;
1.36 djm 3977: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3978: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3979: goto out;
3980:
1.81 djm 3981: sshbuf_reset(blob);
1.1 djm 3982:
1.81 djm 3983: /* assemble uuencoded key */
3984: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3985: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3986: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3987: goto out;
3988:
3989: /* success */
3990: r = 0;
3991:
3992: out:
3993: sshbuf_free(kdf);
3994: sshbuf_free(encoded);
3995: sshbuf_free(encrypted);
1.36 djm 3996: cipher_free(ciphercontext);
1.1 djm 3997: explicit_bzero(salt, sizeof(salt));
1.100 jsg 3998: if (key != NULL)
3999: freezero(key, keylen + ivlen);
4000: if (pubkeyblob != NULL)
4001: freezero(pubkeyblob, pubkeylen);
4002: if (b64 != NULL)
4003: freezero(b64, strlen(b64));
1.1 djm 4004: return r;
4005: }
4006:
4007: static int
1.103 djm 4008: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 4009: {
4010: const u_char *cp;
4011: size_t encoded_len;
1.103 djm 4012: int r;
4013: u_char last;
1.1 djm 4014: struct sshbuf *encoded = NULL, *decoded = NULL;
4015:
1.103 djm 4016: if (blob == NULL || decodedp == NULL)
4017: return SSH_ERR_INVALID_ARGUMENT;
4018:
4019: *decodedp = NULL;
1.1 djm 4020:
4021: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 4022: (decoded = sshbuf_new()) == NULL) {
1.1 djm 4023: r = SSH_ERR_ALLOC_FAIL;
4024: goto out;
4025: }
4026:
4027: /* check preamble */
4028: cp = sshbuf_ptr(blob);
4029: encoded_len = sshbuf_len(blob);
4030: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
4031: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
4032: r = SSH_ERR_INVALID_FORMAT;
4033: goto out;
4034: }
4035: cp += MARK_BEGIN_LEN;
4036: encoded_len -= MARK_BEGIN_LEN;
4037:
4038: /* Look for end marker, removing whitespace as we go */
4039: while (encoded_len > 0) {
4040: if (*cp != '\n' && *cp != '\r') {
4041: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
4042: goto out;
4043: }
4044: last = *cp;
4045: encoded_len--;
4046: cp++;
4047: if (last == '\n') {
4048: if (encoded_len >= MARK_END_LEN &&
4049: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
4050: /* \0 terminate */
4051: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
4052: goto out;
4053: break;
4054: }
4055: }
4056: }
4057: if (encoded_len == 0) {
4058: r = SSH_ERR_INVALID_FORMAT;
4059: goto out;
4060: }
4061:
4062: /* decode base64 */
1.4 djm 4063: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 4064: goto out;
4065:
4066: /* check magic */
4067: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
4068: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
4069: r = SSH_ERR_INVALID_FORMAT;
4070: goto out;
4071: }
1.103 djm 4072: /* success */
4073: *decodedp = decoded;
4074: decoded = NULL;
4075: r = 0;
4076: out:
4077: sshbuf_free(encoded);
4078: sshbuf_free(decoded);
4079: return r;
4080: }
4081:
4082: static int
1.104 djm 4083: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
4084: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 4085: {
4086: char *ciphername = NULL, *kdfname = NULL;
4087: const struct sshcipher *cipher = NULL;
4088: int r = SSH_ERR_INTERNAL_ERROR;
4089: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
4090: struct sshbuf *kdf = NULL, *decrypted = NULL;
4091: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 4092: struct sshkey *pubkey = NULL;
1.103 djm 4093: u_char *key = NULL, *salt = NULL, *dp;
4094: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
4095:
1.104 djm 4096: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 4097: return SSH_ERR_INVALID_ARGUMENT;
4098:
4099: *decryptedp = NULL;
1.104 djm 4100: *pubkeyp = NULL;
1.103 djm 4101:
4102: if ((decrypted = sshbuf_new()) == NULL) {
4103: r = SSH_ERR_ALLOC_FAIL;
4104: goto out;
4105: }
4106:
1.1 djm 4107: /* parse public portion of key */
4108: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
4109: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
4110: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
4111: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 4112: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
4113: goto out;
4114:
4115: if (nkeys != 1) {
4116: /* XXX only one key supported at present */
4117: r = SSH_ERR_INVALID_FORMAT;
4118: goto out;
4119: }
4120:
1.104 djm 4121: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 4122: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
4123: goto out;
4124:
4125: if ((cipher = cipher_by_name(ciphername)) == NULL) {
4126: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4127: goto out;
4128: }
4129: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
4130: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4131: goto out;
4132: }
1.101 markus 4133: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 4134: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 4135: goto out;
4136: }
4137: if ((passphrase == NULL || strlen(passphrase) == 0) &&
4138: strcmp(kdfname, "none") != 0) {
4139: /* passphrase required */
4140: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 4141: goto out;
4142: }
4143:
4144: /* check size of encrypted key blob */
4145: blocksize = cipher_blocksize(cipher);
4146: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
4147: r = SSH_ERR_INVALID_FORMAT;
4148: goto out;
4149: }
4150:
4151: /* setup key */
4152: keylen = cipher_keylen(cipher);
4153: ivlen = cipher_ivlen(cipher);
1.18 djm 4154: authlen = cipher_authlen(cipher);
1.1 djm 4155: if ((key = calloc(1, keylen + ivlen)) == NULL) {
4156: r = SSH_ERR_ALLOC_FAIL;
4157: goto out;
4158: }
4159: if (strcmp(kdfname, "bcrypt") == 0) {
4160: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4161: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4162: goto out;
4163: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4164: key, keylen + ivlen, rounds) < 0) {
4165: r = SSH_ERR_INVALID_FORMAT;
4166: goto out;
4167: }
4168: }
4169:
1.18 djm 4170: /* check that an appropriate amount of auth data is present */
1.84 djm 4171: if (sshbuf_len(decoded) < authlen ||
4172: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4173: r = SSH_ERR_INVALID_FORMAT;
4174: goto out;
4175: }
4176:
1.1 djm 4177: /* decrypt private portion of key */
4178: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4179: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4180: key + keylen, ivlen, 0)) != 0)
4181: goto out;
1.36 djm 4182: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4183: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4184: /* an integrity error here indicates an incorrect passphrase */
4185: if (r == SSH_ERR_MAC_INVALID)
4186: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4187: goto out;
4188: }
1.18 djm 4189: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4190: goto out;
4191: /* there should be no trailing data */
4192: if (sshbuf_len(decoded) != 0) {
4193: r = SSH_ERR_INVALID_FORMAT;
4194: goto out;
4195: }
4196:
4197: /* check check bytes */
4198: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4199: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4200: goto out;
4201: if (check1 != check2) {
4202: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4203: goto out;
4204: }
1.103 djm 4205: /* success */
4206: *decryptedp = decrypted;
4207: decrypted = NULL;
1.104 djm 4208: *pubkeyp = pubkey;
4209: pubkey = NULL;
1.103 djm 4210: r = 0;
4211: out:
4212: cipher_free(ciphercontext);
4213: free(ciphername);
4214: free(kdfname);
1.104 djm 4215: sshkey_free(pubkey);
1.103 djm 4216: if (salt != NULL) {
4217: explicit_bzero(salt, slen);
4218: free(salt);
4219: }
4220: if (key != NULL) {
4221: explicit_bzero(key, keylen + ivlen);
4222: free(key);
4223: }
4224: sshbuf_free(kdf);
4225: sshbuf_free(decrypted);
4226: return r;
4227: }
1.1 djm 4228:
1.103 djm 4229: /* Check deterministic padding after private key */
4230: static int
4231: private2_check_padding(struct sshbuf *decrypted)
4232: {
4233: u_char pad;
4234: size_t i;
4235: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 4236:
4237: i = 0;
4238: while (sshbuf_len(decrypted)) {
4239: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
4240: goto out;
4241: if (pad != (++i & 0xff)) {
4242: r = SSH_ERR_INVALID_FORMAT;
4243: goto out;
4244: }
4245: }
1.103 djm 4246: /* success */
4247: r = 0;
4248: out:
4249: explicit_bzero(&pad, sizeof(pad));
4250: explicit_bzero(&i, sizeof(i));
4251: return r;
4252: }
4253:
4254: static int
4255: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
4256: struct sshkey **keyp, char **commentp)
4257: {
4258: char *comment = NULL;
4259: int r = SSH_ERR_INTERNAL_ERROR;
4260: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 4261: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 4262:
4263: if (keyp != NULL)
4264: *keyp = NULL;
4265: if (commentp != NULL)
4266: *commentp = NULL;
4267:
4268: /* Undo base64 encoding and decrypt the private section */
4269: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 4270: (r = private2_decrypt(decoded, passphrase,
4271: &decrypted, &pubkey)) != 0)
1.103 djm 4272: goto out;
1.105 djm 4273:
4274: if (type != KEY_UNSPEC &&
4275: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
4276: r = SSH_ERR_KEY_TYPE_MISMATCH;
4277: goto out;
4278: }
1.103 djm 4279:
4280: /* Load the private key and comment */
4281: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4282: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4283: goto out;
4284:
4285: /* Check deterministic padding after private section */
4286: if ((r = private2_check_padding(decrypted)) != 0)
4287: goto out;
1.1 djm 4288:
1.104 djm 4289: /* Check that the public key in the envelope matches the private key */
4290: if (!sshkey_equal(pubkey, k)) {
4291: r = SSH_ERR_INVALID_FORMAT;
4292: goto out;
4293: }
1.1 djm 4294:
4295: /* success */
4296: r = 0;
4297: if (keyp != NULL) {
4298: *keyp = k;
4299: k = NULL;
4300: }
4301: if (commentp != NULL) {
4302: *commentp = comment;
4303: comment = NULL;
4304: }
4305: out:
4306: free(comment);
4307: sshbuf_free(decoded);
4308: sshbuf_free(decrypted);
4309: sshkey_free(k);
1.104 djm 4310: sshkey_free(pubkey);
1.1 djm 4311: return r;
4312: }
4313:
4314: #ifdef WITH_OPENSSL
1.80 djm 4315: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4316: static int
1.80 djm 4317: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4318: int format, const char *_passphrase, const char *comment)
1.1 djm 4319: {
1.76 djm 4320: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4321: int success, r;
4322: int blen, len = strlen(_passphrase);
4323: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4324: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4325: char *bptr;
1.1 djm 4326: BIO *bio = NULL;
1.76 djm 4327: struct sshbuf *blob;
1.80 djm 4328: EVP_PKEY *pkey = NULL;
1.1 djm 4329:
4330: if (len > 0 && len <= 4)
4331: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4332: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4333: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4334: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4335: r = SSH_ERR_ALLOC_FAIL;
4336: goto out;
4337: }
4338: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4339: r = SSH_ERR_ALLOC_FAIL;
4340: goto out;
1.76 djm 4341: }
4342: if ((r = sshkey_unshield_private(key)) != 0)
4343: goto out;
1.1 djm 4344:
4345: switch (key->type) {
4346: case KEY_DSA:
1.80 djm 4347: if (format == SSHKEY_PRIVATE_PEM) {
4348: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4349: cipher, passphrase, len, NULL, NULL);
4350: } else {
4351: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4352: }
1.1 djm 4353: break;
4354: case KEY_ECDSA:
1.80 djm 4355: if (format == SSHKEY_PRIVATE_PEM) {
4356: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4357: cipher, passphrase, len, NULL, NULL);
4358: } else {
4359: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4360: }
1.1 djm 4361: break;
4362: case KEY_RSA:
1.80 djm 4363: if (format == SSHKEY_PRIVATE_PEM) {
4364: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4365: cipher, passphrase, len, NULL, NULL);
4366: } else {
4367: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4368: }
1.1 djm 4369: break;
4370: default:
4371: success = 0;
4372: break;
4373: }
4374: if (success == 0) {
4375: r = SSH_ERR_LIBCRYPTO_ERROR;
4376: goto out;
4377: }
1.80 djm 4378: if (format == SSHKEY_PRIVATE_PKCS8) {
4379: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4380: passphrase, len, NULL, NULL)) == 0) {
4381: r = SSH_ERR_LIBCRYPTO_ERROR;
4382: goto out;
4383: }
4384: }
1.1 djm 4385: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4386: r = SSH_ERR_INTERNAL_ERROR;
4387: goto out;
4388: }
4389: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4390: goto out;
4391: r = 0;
4392: out:
1.76 djm 4393: if (was_shielded)
4394: r = sshkey_shield_private(key);
4395: if (r == 0)
4396: r = sshbuf_putb(buf, blob);
1.80 djm 4397:
4398: EVP_PKEY_free(pkey);
1.76 djm 4399: sshbuf_free(blob);
1.1 djm 4400: BIO_free(bio);
4401: return r;
4402: }
4403: #endif /* WITH_OPENSSL */
4404:
4405: /* Serialise "key" to buffer "blob" */
4406: int
4407: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4408: const char *passphrase, const char *comment,
1.80 djm 4409: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4410: {
4411: switch (key->type) {
1.9 markus 4412: #ifdef WITH_OPENSSL
1.1 djm 4413: case KEY_DSA:
4414: case KEY_ECDSA:
4415: case KEY_RSA:
1.80 djm 4416: break; /* see below */
1.1 djm 4417: #endif /* WITH_OPENSSL */
4418: case KEY_ED25519:
1.90 markus 4419: case KEY_ED25519_SK:
1.62 markus 4420: #ifdef WITH_XMSS
4421: case KEY_XMSS:
4422: #endif /* WITH_XMSS */
1.85 djm 4423: #ifdef WITH_OPENSSL
4424: case KEY_ECDSA_SK:
4425: #endif /* WITH_OPENSSL */
1.1 djm 4426: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4427: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4428: default:
4429: return SSH_ERR_KEY_TYPE_UNKNOWN;
4430: }
1.80 djm 4431:
4432: #ifdef WITH_OPENSSL
4433: switch (format) {
4434: case SSHKEY_PRIVATE_OPENSSH:
4435: return sshkey_private_to_blob2(key, blob, passphrase,
4436: comment, openssh_format_cipher, openssh_format_rounds);
4437: case SSHKEY_PRIVATE_PEM:
4438: case SSHKEY_PRIVATE_PKCS8:
4439: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4440: format, passphrase, comment);
4441: default:
4442: return SSH_ERR_INVALID_ARGUMENT;
4443: }
4444: #endif /* WITH_OPENSSL */
1.1 djm 4445: }
4446:
4447: #ifdef WITH_OPENSSL
1.8 djm 4448: static int
1.52 djm 4449: translate_libcrypto_error(unsigned long pem_err)
4450: {
4451: int pem_reason = ERR_GET_REASON(pem_err);
4452:
4453: switch (ERR_GET_LIB(pem_err)) {
4454: case ERR_LIB_PEM:
4455: switch (pem_reason) {
4456: case PEM_R_BAD_PASSWORD_READ:
4457: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4458: case PEM_R_BAD_DECRYPT:
4459: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4460: default:
4461: return SSH_ERR_INVALID_FORMAT;
4462: }
4463: case ERR_LIB_EVP:
4464: switch (pem_reason) {
4465: case EVP_R_BAD_DECRYPT:
4466: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4467: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4468: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4469: #endif
1.52 djm 4470: case EVP_R_DECODE_ERROR:
4471: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4472: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4473: #endif
4474: return SSH_ERR_INVALID_FORMAT;
4475: default:
4476: return SSH_ERR_LIBCRYPTO_ERROR;
4477: }
4478: case ERR_LIB_ASN1:
4479: return SSH_ERR_INVALID_FORMAT;
4480: }
4481: return SSH_ERR_LIBCRYPTO_ERROR;
4482: }
4483:
4484: static void
4485: clear_libcrypto_errors(void)
4486: {
4487: while (ERR_get_error() != 0)
4488: ;
4489: }
4490:
4491: /*
4492: * Translate OpenSSL error codes to determine whether
4493: * passphrase is required/incorrect.
4494: */
4495: static int
4496: convert_libcrypto_error(void)
4497: {
4498: /*
4499: * Some password errors are reported at the beginning
4500: * of the error queue.
4501: */
4502: if (translate_libcrypto_error(ERR_peek_error()) ==
4503: SSH_ERR_KEY_WRONG_PASSPHRASE)
4504: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4505: return translate_libcrypto_error(ERR_peek_last_error());
4506: }
4507:
4508: static int
1.1 djm 4509: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4510: const char *passphrase, struct sshkey **keyp)
1.1 djm 4511: {
4512: EVP_PKEY *pk = NULL;
4513: struct sshkey *prv = NULL;
4514: BIO *bio = NULL;
4515: int r;
4516:
1.32 djm 4517: if (keyp != NULL)
4518: *keyp = NULL;
1.1 djm 4519:
4520: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4521: return SSH_ERR_ALLOC_FAIL;
4522: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4523: (int)sshbuf_len(blob)) {
4524: r = SSH_ERR_ALLOC_FAIL;
4525: goto out;
4526: }
4527:
1.52 djm 4528: clear_libcrypto_errors();
1.1 djm 4529: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4530: (char *)passphrase)) == NULL) {
1.71 djm 4531: /*
4532: * libcrypto may return various ASN.1 errors when attempting
4533: * to parse a key with an incorrect passphrase.
4534: * Treat all format errors as "incorrect passphrase" if a
4535: * passphrase was supplied.
4536: */
4537: if (passphrase != NULL && *passphrase != '\0')
4538: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4539: else
4540: r = convert_libcrypto_error();
1.1 djm 4541: goto out;
4542: }
1.69 djm 4543: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4544: (type == KEY_UNSPEC || type == KEY_RSA)) {
4545: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4546: r = SSH_ERR_ALLOC_FAIL;
4547: goto out;
4548: }
4549: prv->rsa = EVP_PKEY_get1_RSA(pk);
4550: prv->type = KEY_RSA;
4551: #ifdef DEBUG_PK
4552: RSA_print_fp(stderr, prv->rsa, 8);
4553: #endif
4554: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4555: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4556: goto out;
4557: }
1.69 djm 4558: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4559: goto out;
1.69 djm 4560: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4561: (type == KEY_UNSPEC || type == KEY_DSA)) {
4562: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4563: r = SSH_ERR_ALLOC_FAIL;
4564: goto out;
4565: }
4566: prv->dsa = EVP_PKEY_get1_DSA(pk);
4567: prv->type = KEY_DSA;
4568: #ifdef DEBUG_PK
4569: DSA_print_fp(stderr, prv->dsa, 8);
4570: #endif
1.69 djm 4571: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4572: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4573: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4574: r = SSH_ERR_ALLOC_FAIL;
4575: goto out;
4576: }
4577: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4578: prv->type = KEY_ECDSA;
4579: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4580: if (prv->ecdsa_nid == -1 ||
4581: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4582: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4583: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4584: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4585: r = SSH_ERR_INVALID_FORMAT;
4586: goto out;
4587: }
4588: #ifdef DEBUG_PK
4589: if (prv != NULL && prv->ecdsa != NULL)
4590: sshkey_dump_ec_key(prv->ecdsa);
4591: #endif
4592: } else {
4593: r = SSH_ERR_INVALID_FORMAT;
4594: goto out;
4595: }
4596: r = 0;
1.32 djm 4597: if (keyp != NULL) {
4598: *keyp = prv;
4599: prv = NULL;
4600: }
1.1 djm 4601: out:
4602: BIO_free(bio);
1.60 jsing 4603: EVP_PKEY_free(pk);
1.30 mmcc 4604: sshkey_free(prv);
1.1 djm 4605: return r;
4606: }
4607: #endif /* WITH_OPENSSL */
4608:
4609: int
4610: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4611: const char *passphrase, struct sshkey **keyp, char **commentp)
4612: {
1.42 djm 4613: int r = SSH_ERR_INTERNAL_ERROR;
4614:
1.32 djm 4615: if (keyp != NULL)
4616: *keyp = NULL;
1.1 djm 4617: if (commentp != NULL)
4618: *commentp = NULL;
4619:
4620: switch (type) {
4621: case KEY_ED25519:
1.62 markus 4622: case KEY_XMSS:
1.106 ! djm 4623: /* No fallback for new-format-only keys */
1.1 djm 4624: return sshkey_parse_private2(blob, type, passphrase,
4625: keyp, commentp);
1.106 ! djm 4626: default:
1.42 djm 4627: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4628: commentp);
1.106 ! djm 4629: /* Only fallback to PEM parser if a format error occurred. */
! 4630: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 4631: return r;
1.1 djm 4632: #ifdef WITH_OPENSSL
1.8 djm 4633: return sshkey_parse_private_pem_fileblob(blob, type,
4634: passphrase, keyp);
1.1 djm 4635: #else
4636: return SSH_ERR_INVALID_FORMAT;
4637: #endif /* WITH_OPENSSL */
4638: }
4639: }
4640:
4641: int
4642: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4643: struct sshkey **keyp, char **commentp)
1.1 djm 4644: {
4645: if (keyp != NULL)
4646: *keyp = NULL;
4647: if (commentp != NULL)
4648: *commentp = NULL;
4649:
1.23 tim 4650: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4651: passphrase, keyp, commentp);
1.96 djm 4652: }
4653:
4654: void
4655: sshkey_sig_details_free(struct sshkey_sig_details *details)
4656: {
4657: freezero(details, sizeof(*details));
1.1 djm 4658: }
1.62 markus 4659:
4660: #ifdef WITH_XMSS
4661: /*
4662: * serialize the key with the current state and forward the state
4663: * maxsign times.
4664: */
4665: int
1.77 djm 4666: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4667: u_int32_t maxsign, sshkey_printfn *pr)
4668: {
4669: int r, rupdate;
4670:
4671: if (maxsign == 0 ||
4672: sshkey_type_plain(k->type) != KEY_XMSS)
4673: return sshkey_private_serialize_opt(k, b,
4674: SSHKEY_SERIALIZE_DEFAULT);
4675: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4676: (r = sshkey_private_serialize_opt(k, b,
4677: SSHKEY_SERIALIZE_STATE)) != 0 ||
4678: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4679: goto out;
4680: r = 0;
4681: out:
4682: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4683: if (r == 0)
4684: r = rupdate;
4685: }
4686: return r;
4687: }
4688:
4689: u_int32_t
4690: sshkey_signatures_left(const struct sshkey *k)
4691: {
4692: if (sshkey_type_plain(k->type) == KEY_XMSS)
4693: return sshkey_xmss_signatures_left(k);
4694: return 0;
4695: }
4696:
4697: int
4698: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4699: {
4700: if (sshkey_type_plain(k->type) != KEY_XMSS)
4701: return SSH_ERR_INVALID_ARGUMENT;
4702: return sshkey_xmss_enable_maxsign(k, maxsign);
4703: }
4704:
4705: int
4706: sshkey_set_filename(struct sshkey *k, const char *filename)
4707: {
4708: if (k == NULL)
4709: return SSH_ERR_INVALID_ARGUMENT;
4710: if (sshkey_type_plain(k->type) != KEY_XMSS)
4711: return 0;
4712: if (filename == NULL)
4713: return SSH_ERR_INVALID_ARGUMENT;
4714: if ((k->xmss_filename = strdup(filename)) == NULL)
4715: return SSH_ERR_ALLOC_FAIL;
4716: return 0;
4717: }
4718: #else
4719: int
1.76 djm 4720: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4721: u_int32_t maxsign, sshkey_printfn *pr)
4722: {
4723: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4724: }
4725:
4726: u_int32_t
4727: sshkey_signatures_left(const struct sshkey *k)
4728: {
4729: return 0;
4730: }
4731:
4732: int
4733: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4734: {
4735: return SSH_ERR_INVALID_ARGUMENT;
4736: }
4737:
4738: int
4739: sshkey_set_filename(struct sshkey *k, const char *filename)
4740: {
4741: if (k == NULL)
4742: return SSH_ERR_INVALID_ARGUMENT;
4743: return 0;
4744: }
4745: #endif /* WITH_XMSS */
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