Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.96
1.96 ! djm 1: /* $OpenBSD: sshkey.c,v 1.95 2019/11/18 06:58:00 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);
993: if (blob != NULL) {
994: explicit_bzero(blob, blob_len);
995: free(blob);
996: }
997: return r;
998: }
999:
1000: static char *
1.7 djm 1001: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1002: {
1003: char *ret;
1004: size_t plen = strlen(alg) + 1;
1005: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
1006:
1007: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
1008: return NULL;
1009: strlcpy(ret, alg, rlen);
1010: strlcat(ret, ":", rlen);
1011: if (dgst_raw_len == 0)
1012: return ret;
1.79 dtucker 1013: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 1014: freezero(ret, rlen);
1.7 djm 1015: return NULL;
1016: }
1017: /* Trim padding characters from end */
1018: ret[strcspn(ret, "=")] = '\0';
1019: return ret;
1020: }
1021:
1022: static char *
1023: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 1024: {
1.7 djm 1025: char *retval, hex[5];
1026: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 1027:
1.7 djm 1028: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 1029: return NULL;
1.7 djm 1030: strlcpy(retval, alg, rlen);
1031: strlcat(retval, ":", rlen);
1.1 djm 1032: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 1033: snprintf(hex, sizeof(hex), "%s%02x",
1034: i > 0 ? ":" : "", dgst_raw[i]);
1035: strlcat(retval, hex, rlen);
1.1 djm 1036: }
1037: return retval;
1038: }
1039:
1040: static char *
1041: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
1042: {
1043: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1044: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1045: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1046: u_int i, j = 0, rounds, seed = 1;
1047: char *retval;
1048:
1049: rounds = (dgst_raw_len / 2) + 1;
1050: if ((retval = calloc(rounds, 6)) == NULL)
1051: return NULL;
1052: retval[j++] = 'x';
1053: for (i = 0; i < rounds; i++) {
1054: u_int idx0, idx1, idx2, idx3, idx4;
1055: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1056: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1057: seed) % 6;
1058: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1059: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1060: (seed / 6)) % 6;
1061: retval[j++] = vowels[idx0];
1062: retval[j++] = consonants[idx1];
1063: retval[j++] = vowels[idx2];
1064: if ((i + 1) < rounds) {
1065: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1066: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1067: retval[j++] = consonants[idx3];
1068: retval[j++] = '-';
1069: retval[j++] = consonants[idx4];
1070: seed = ((seed * 5) +
1071: ((((u_int)(dgst_raw[2 * i])) * 7) +
1072: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1073: }
1074: } else {
1075: idx0 = seed % 6;
1076: idx1 = 16;
1077: idx2 = seed / 6;
1078: retval[j++] = vowels[idx0];
1079: retval[j++] = consonants[idx1];
1080: retval[j++] = vowels[idx2];
1081: }
1082: }
1083: retval[j++] = 'x';
1084: retval[j++] = '\0';
1085: return retval;
1086: }
1087:
1088: /*
1089: * Draw an ASCII-Art representing the fingerprint so human brain can
1090: * profit from its built-in pattern recognition ability.
1091: * This technique is called "random art" and can be found in some
1092: * scientific publications like this original paper:
1093: *
1094: * "Hash Visualization: a New Technique to improve Real-World Security",
1095: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1096: * Techniques and E-Commerce (CrypTEC '99)
1097: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1098: *
1099: * The subject came up in a talk by Dan Kaminsky, too.
1100: *
1101: * If you see the picture is different, the key is different.
1102: * If the picture looks the same, you still know nothing.
1103: *
1104: * The algorithm used here is a worm crawling over a discrete plane,
1105: * leaving a trace (augmenting the field) everywhere it goes.
1106: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1107: * makes the respective movement vector be ignored for this turn.
1108: * Graphs are not unambiguous, because circles in graphs can be
1109: * walked in either direction.
1110: */
1111:
1112: /*
1113: * Field sizes for the random art. Have to be odd, so the starting point
1114: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1115: * Else pictures would be too dense, and drawing the frame would
1116: * fail, too, because the key type would not fit in anymore.
1117: */
1118: #define FLDBASE 8
1119: #define FLDSIZE_Y (FLDBASE + 1)
1120: #define FLDSIZE_X (FLDBASE * 2 + 1)
1121: static char *
1.7 djm 1122: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1123: const struct sshkey *k)
1124: {
1125: /*
1126: * Chars to be used after each other every time the worm
1127: * intersects with itself. Matter of taste.
1128: */
1129: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1130: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1131: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1132: size_t i, tlen, hlen;
1.1 djm 1133: u_int b;
1.3 djm 1134: int x, y, r;
1.1 djm 1135: size_t len = strlen(augmentation_string) - 1;
1136:
1137: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1138: return NULL;
1139:
1140: /* initialize field */
1141: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1142: x = FLDSIZE_X / 2;
1143: y = FLDSIZE_Y / 2;
1144:
1145: /* process raw key */
1146: for (i = 0; i < dgst_raw_len; i++) {
1147: int input;
1148: /* each byte conveys four 2-bit move commands */
1149: input = dgst_raw[i];
1150: for (b = 0; b < 4; b++) {
1151: /* evaluate 2 bit, rest is shifted later */
1152: x += (input & 0x1) ? 1 : -1;
1153: y += (input & 0x2) ? 1 : -1;
1154:
1155: /* assure we are still in bounds */
1.37 deraadt 1156: x = MAXIMUM(x, 0);
1157: y = MAXIMUM(y, 0);
1158: x = MINIMUM(x, FLDSIZE_X - 1);
1159: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1160:
1161: /* augment the field */
1162: if (field[x][y] < len - 2)
1163: field[x][y]++;
1164: input = input >> 2;
1165: }
1166: }
1167:
1168: /* mark starting point and end point*/
1169: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1170: field[x][y] = len;
1171:
1.3 djm 1172: /* assemble title */
1173: r = snprintf(title, sizeof(title), "[%s %u]",
1174: sshkey_type(k), sshkey_size(k));
1175: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1176: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1177: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1178: tlen = (r <= 0) ? 0 : strlen(title);
1179:
1180: /* assemble hash ID. */
1181: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1182: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1183:
1184: /* output upper border */
1.3 djm 1185: p = retval;
1186: *p++ = '+';
1187: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1188: *p++ = '-';
1189: memcpy(p, title, tlen);
1190: p += tlen;
1.7 djm 1191: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1192: *p++ = '-';
1193: *p++ = '+';
1194: *p++ = '\n';
1195:
1196: /* output content */
1197: for (y = 0; y < FLDSIZE_Y; y++) {
1198: *p++ = '|';
1199: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1200: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1201: *p++ = '|';
1202: *p++ = '\n';
1203: }
1204:
1205: /* output lower border */
1206: *p++ = '+';
1.7 djm 1207: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1208: *p++ = '-';
1209: memcpy(p, hash, hlen);
1210: p += hlen;
1211: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1212: *p++ = '-';
1213: *p++ = '+';
1214:
1215: return retval;
1216: }
1217:
1218: char *
1.7 djm 1219: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1220: enum sshkey_fp_rep dgst_rep)
1221: {
1222: char *retval = NULL;
1223: u_char *dgst_raw;
1224: size_t dgst_raw_len;
1225:
1.7 djm 1226: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1227: return NULL;
1228: switch (dgst_rep) {
1.7 djm 1229: case SSH_FP_DEFAULT:
1230: if (dgst_alg == SSH_DIGEST_MD5) {
1231: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1232: dgst_raw, dgst_raw_len);
1233: } else {
1234: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1235: dgst_raw, dgst_raw_len);
1236: }
1237: break;
1.1 djm 1238: case SSH_FP_HEX:
1.7 djm 1239: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1240: dgst_raw, dgst_raw_len);
1241: break;
1242: case SSH_FP_BASE64:
1243: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1244: dgst_raw, dgst_raw_len);
1.1 djm 1245: break;
1246: case SSH_FP_BUBBLEBABBLE:
1247: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1248: break;
1249: case SSH_FP_RANDOMART:
1.7 djm 1250: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1251: dgst_raw, dgst_raw_len, k);
1.1 djm 1252: break;
1253: default:
1254: explicit_bzero(dgst_raw, dgst_raw_len);
1255: free(dgst_raw);
1256: return NULL;
1257: }
1258: explicit_bzero(dgst_raw, dgst_raw_len);
1259: free(dgst_raw);
1260: return retval;
1261: }
1262:
1.63 djm 1263: static int
1264: peek_type_nid(const char *s, size_t l, int *nid)
1265: {
1266: const struct keytype *kt;
1267:
1268: for (kt = keytypes; kt->type != -1; kt++) {
1269: if (kt->name == NULL || strlen(kt->name) != l)
1270: continue;
1271: if (memcmp(s, kt->name, l) == 0) {
1272: *nid = -1;
1.85 djm 1273: if (key_type_is_ecdsa_variant(kt->type))
1.63 djm 1274: *nid = kt->nid;
1275: return kt->type;
1276: }
1277: }
1278: return KEY_UNSPEC;
1279: }
1280:
1.1 djm 1281:
1.63 djm 1282: /* XXX this can now be made const char * */
1.1 djm 1283: int
1284: sshkey_read(struct sshkey *ret, char **cpp)
1285: {
1286: struct sshkey *k;
1.63 djm 1287: char *cp, *blobcopy;
1288: size_t space;
1.1 djm 1289: int r, type, curve_nid = -1;
1290: struct sshbuf *blob;
1.44 dtucker 1291:
1292: if (ret == NULL)
1293: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1294:
1295: switch (ret->type) {
1296: case KEY_UNSPEC:
1297: case KEY_RSA:
1298: case KEY_DSA:
1299: case KEY_ECDSA:
1.85 djm 1300: case KEY_ECDSA_SK:
1.1 djm 1301: case KEY_ED25519:
1.90 markus 1302: case KEY_ED25519_SK:
1.1 djm 1303: case KEY_DSA_CERT:
1304: case KEY_ECDSA_CERT:
1.85 djm 1305: case KEY_ECDSA_SK_CERT:
1.1 djm 1306: case KEY_RSA_CERT:
1307: case KEY_ED25519_CERT:
1.90 markus 1308: case KEY_ED25519_SK_CERT:
1.62 markus 1309: #ifdef WITH_XMSS
1310: case KEY_XMSS:
1311: case KEY_XMSS_CERT:
1312: #endif /* WITH_XMSS */
1.63 djm 1313: break; /* ok */
1314: default:
1315: return SSH_ERR_INVALID_ARGUMENT;
1316: }
1317:
1318: /* Decode type */
1319: cp = *cpp;
1320: space = strcspn(cp, " \t");
1321: if (space == strlen(cp))
1322: return SSH_ERR_INVALID_FORMAT;
1323: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1324: return SSH_ERR_INVALID_FORMAT;
1325:
1326: /* skip whitespace */
1327: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1328: ;
1329: if (*cp == '\0')
1330: return SSH_ERR_INVALID_FORMAT;
1331: if (ret->type != KEY_UNSPEC && ret->type != type)
1332: return SSH_ERR_KEY_TYPE_MISMATCH;
1333: if ((blob = sshbuf_new()) == NULL)
1334: return SSH_ERR_ALLOC_FAIL;
1335:
1336: /* find end of keyblob and decode */
1337: space = strcspn(cp, " \t");
1338: if ((blobcopy = strndup(cp, space)) == NULL) {
1339: sshbuf_free(blob);
1340: return SSH_ERR_ALLOC_FAIL;
1341: }
1342: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1343: free(blobcopy);
1344: sshbuf_free(blob);
1345: return r;
1346: }
1347: free(blobcopy);
1348: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1349: sshbuf_free(blob);
1.63 djm 1350: return r;
1351: }
1352: sshbuf_free(blob);
1353:
1354: /* skip whitespace and leave cp at start of comment */
1355: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1356: ;
1357:
1358: /* ensure type of blob matches type at start of line */
1359: if (k->type != type) {
1360: sshkey_free(k);
1361: return SSH_ERR_KEY_TYPE_MISMATCH;
1362: }
1.85 djm 1363: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1364: sshkey_free(k);
1365: return SSH_ERR_EC_CURVE_MISMATCH;
1366: }
1367:
1368: /* Fill in ret from parsed key */
1369: ret->type = type;
1370: if (sshkey_is_cert(ret)) {
1371: if (!sshkey_is_cert(k)) {
1.1 djm 1372: sshkey_free(k);
1.63 djm 1373: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1374: }
1.63 djm 1375: if (ret->cert != NULL)
1376: cert_free(ret->cert);
1377: ret->cert = k->cert;
1378: k->cert = NULL;
1379: }
1380: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1381: #ifdef WITH_OPENSSL
1.63 djm 1382: case KEY_RSA:
1383: RSA_free(ret->rsa);
1384: ret->rsa = k->rsa;
1385: k->rsa = NULL;
1.1 djm 1386: #ifdef DEBUG_PK
1.63 djm 1387: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1388: #endif
1.63 djm 1389: break;
1390: case KEY_DSA:
1391: DSA_free(ret->dsa);
1392: ret->dsa = k->dsa;
1393: k->dsa = NULL;
1.1 djm 1394: #ifdef DEBUG_PK
1.63 djm 1395: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1396: #endif
1.63 djm 1397: break;
1398: case KEY_ECDSA:
1399: EC_KEY_free(ret->ecdsa);
1400: ret->ecdsa = k->ecdsa;
1401: ret->ecdsa_nid = k->ecdsa_nid;
1402: k->ecdsa = NULL;
1403: k->ecdsa_nid = -1;
1.1 djm 1404: #ifdef DEBUG_PK
1.63 djm 1405: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1406: #endif
1.63 djm 1407: break;
1.85 djm 1408: case KEY_ECDSA_SK:
1409: EC_KEY_free(ret->ecdsa);
1410: ret->ecdsa = k->ecdsa;
1411: ret->ecdsa_nid = k->ecdsa_nid;
1412: ret->sk_application = k->sk_application;
1413: k->ecdsa = NULL;
1414: k->ecdsa_nid = -1;
1415: k->sk_application = NULL;
1416: #ifdef DEBUG_PK
1417: sshkey_dump_ec_key(ret->ecdsa);
1418: fprintf(stderr, "App: %s\n", ret->sk_application);
1419: #endif
1420: break;
1.1 djm 1421: #endif /* WITH_OPENSSL */
1.63 djm 1422: case KEY_ED25519:
1423: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1424: ret->ed25519_pk = k->ed25519_pk;
1425: k->ed25519_pk = NULL;
1.1 djm 1426: #ifdef DEBUG_PK
1.63 djm 1427: /* XXX */
1.1 djm 1428: #endif
1.63 djm 1429: break;
1.90 markus 1430: case KEY_ED25519_SK:
1431: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1432: ret->ed25519_pk = k->ed25519_pk;
1433: ret->sk_application = k->sk_application;
1434: k->ed25519_pk = NULL;
1435: k->sk_application = NULL;
1436: break;
1.62 markus 1437: #ifdef WITH_XMSS
1.63 djm 1438: case KEY_XMSS:
1439: free(ret->xmss_pk);
1440: ret->xmss_pk = k->xmss_pk;
1441: k->xmss_pk = NULL;
1442: free(ret->xmss_state);
1443: ret->xmss_state = k->xmss_state;
1444: k->xmss_state = NULL;
1445: free(ret->xmss_name);
1446: ret->xmss_name = k->xmss_name;
1447: k->xmss_name = NULL;
1448: free(ret->xmss_filename);
1449: ret->xmss_filename = k->xmss_filename;
1450: k->xmss_filename = NULL;
1.62 markus 1451: #ifdef DEBUG_PK
1.63 djm 1452: /* XXX */
1.62 markus 1453: #endif
1.63 djm 1454: break;
1.62 markus 1455: #endif /* WITH_XMSS */
1.63 djm 1456: default:
1.1 djm 1457: sshkey_free(k);
1.63 djm 1458: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1459: }
1.63 djm 1460: sshkey_free(k);
1461:
1462: /* success */
1463: *cpp = cp;
1464: return 0;
1.1 djm 1465: }
1466:
1467: int
1.19 djm 1468: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1469: {
1.19 djm 1470: int r = SSH_ERR_INTERNAL_ERROR;
1471: struct sshbuf *b = NULL;
1.1 djm 1472: char *uu = NULL;
1.19 djm 1473:
1474: if (b64p != NULL)
1475: *b64p = NULL;
1476: if ((b = sshbuf_new()) == NULL)
1477: return SSH_ERR_ALLOC_FAIL;
1478: if ((r = sshkey_putb(key, b)) != 0)
1479: goto out;
1.81 djm 1480: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1481: r = SSH_ERR_ALLOC_FAIL;
1482: goto out;
1483: }
1484: /* Success */
1485: if (b64p != NULL) {
1486: *b64p = uu;
1487: uu = NULL;
1488: }
1489: r = 0;
1490: out:
1491: sshbuf_free(b);
1492: free(uu);
1493: return r;
1494: }
1495:
1.52 djm 1496: int
1.19 djm 1497: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1498: {
1499: int r = SSH_ERR_INTERNAL_ERROR;
1500: char *uu = NULL;
1501:
1.48 djm 1502: if ((r = sshkey_to_base64(key, &uu)) != 0)
1503: goto out;
1504: if ((r = sshbuf_putf(b, "%s %s",
1505: sshkey_ssh_name(key), uu)) != 0)
1506: goto out;
1.19 djm 1507: r = 0;
1508: out:
1509: free(uu);
1510: return r;
1511: }
1512:
1513: int
1514: sshkey_write(const struct sshkey *key, FILE *f)
1515: {
1516: struct sshbuf *b = NULL;
1517: int r = SSH_ERR_INTERNAL_ERROR;
1518:
1519: if ((b = sshbuf_new()) == NULL)
1520: return SSH_ERR_ALLOC_FAIL;
1521: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1522: goto out;
1523: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1524: if (feof(f))
1525: errno = EPIPE;
1.19 djm 1526: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1527: goto out;
1528: }
1.19 djm 1529: /* Success */
1530: r = 0;
1.1 djm 1531: out:
1.19 djm 1532: sshbuf_free(b);
1533: return r;
1.1 djm 1534: }
1535:
1536: const char *
1537: sshkey_cert_type(const struct sshkey *k)
1538: {
1539: switch (k->cert->type) {
1540: case SSH2_CERT_TYPE_USER:
1541: return "user";
1542: case SSH2_CERT_TYPE_HOST:
1543: return "host";
1544: default:
1545: return "unknown";
1546: }
1547: }
1548:
1549: #ifdef WITH_OPENSSL
1550: static int
1551: rsa_generate_private_key(u_int bits, RSA **rsap)
1552: {
1553: RSA *private = NULL;
1554: BIGNUM *f4 = NULL;
1555: int ret = SSH_ERR_INTERNAL_ERROR;
1556:
1.49 djm 1557: if (rsap == NULL)
1558: return SSH_ERR_INVALID_ARGUMENT;
1559: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1560: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1561: return SSH_ERR_KEY_LENGTH;
1.1 djm 1562: *rsap = NULL;
1563: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1564: ret = SSH_ERR_ALLOC_FAIL;
1565: goto out;
1566: }
1567: if (!BN_set_word(f4, RSA_F4) ||
1568: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1569: ret = SSH_ERR_LIBCRYPTO_ERROR;
1570: goto out;
1571: }
1572: *rsap = private;
1573: private = NULL;
1574: ret = 0;
1575: out:
1.60 jsing 1576: RSA_free(private);
1577: BN_free(f4);
1.1 djm 1578: return ret;
1579: }
1580:
1581: static int
1582: dsa_generate_private_key(u_int bits, DSA **dsap)
1583: {
1584: DSA *private;
1585: int ret = SSH_ERR_INTERNAL_ERROR;
1586:
1.49 djm 1587: if (dsap == NULL)
1.1 djm 1588: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1589: if (bits != 1024)
1590: return SSH_ERR_KEY_LENGTH;
1.1 djm 1591: if ((private = DSA_new()) == NULL) {
1592: ret = SSH_ERR_ALLOC_FAIL;
1593: goto out;
1594: }
1595: *dsap = NULL;
1596: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1597: NULL, NULL) || !DSA_generate_key(private)) {
1598: ret = SSH_ERR_LIBCRYPTO_ERROR;
1599: goto out;
1600: }
1601: *dsap = private;
1602: private = NULL;
1603: ret = 0;
1604: out:
1.60 jsing 1605: DSA_free(private);
1.1 djm 1606: return ret;
1607: }
1608:
1609: int
1610: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1611: {
1612: EC_GROUP *eg;
1613: int nids[] = {
1614: NID_X9_62_prime256v1,
1615: NID_secp384r1,
1616: NID_secp521r1,
1617: -1
1618: };
1619: int nid;
1620: u_int i;
1621: const EC_GROUP *g = EC_KEY_get0_group(k);
1622:
1623: /*
1624: * The group may be stored in a ASN.1 encoded private key in one of two
1625: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1626: * or explicit group parameters encoded into the key blob. Only the
1627: * "named group" case sets the group NID for us, but we can figure
1628: * it out for the other case by comparing against all the groups that
1629: * are supported.
1630: */
1631: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1632: return nid;
1633: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1634: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1635: return -1;
1.93 djm 1636: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1637: break;
1638: EC_GROUP_free(eg);
1639: }
1640: if (nids[i] != -1) {
1641: /* Use the group with the NID attached */
1642: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1643: if (EC_KEY_set_group(k, eg) != 1) {
1644: EC_GROUP_free(eg);
1645: return -1;
1646: }
1647: }
1648: return nids[i];
1649: }
1650:
1651: static int
1652: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1653: {
1654: EC_KEY *private;
1655: int ret = SSH_ERR_INTERNAL_ERROR;
1656:
1.50 djm 1657: if (nid == NULL || ecdsap == NULL)
1.1 djm 1658: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1659: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1660: return SSH_ERR_KEY_LENGTH;
1.1 djm 1661: *ecdsap = NULL;
1662: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1663: ret = SSH_ERR_ALLOC_FAIL;
1664: goto out;
1665: }
1666: if (EC_KEY_generate_key(private) != 1) {
1667: ret = SSH_ERR_LIBCRYPTO_ERROR;
1668: goto out;
1669: }
1670: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1671: *ecdsap = private;
1672: private = NULL;
1673: ret = 0;
1674: out:
1.60 jsing 1675: EC_KEY_free(private);
1.1 djm 1676: return ret;
1677: }
1678: #endif /* WITH_OPENSSL */
1679:
1680: int
1681: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1682: {
1683: struct sshkey *k;
1684: int ret = SSH_ERR_INTERNAL_ERROR;
1685:
1686: if (keyp == NULL)
1687: return SSH_ERR_INVALID_ARGUMENT;
1688: *keyp = NULL;
1689: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1690: return SSH_ERR_ALLOC_FAIL;
1691: switch (type) {
1692: case KEY_ED25519:
1693: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1694: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1695: ret = SSH_ERR_ALLOC_FAIL;
1696: break;
1697: }
1698: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1699: ret = 0;
1700: break;
1.62 markus 1701: #ifdef WITH_XMSS
1702: case KEY_XMSS:
1703: ret = sshkey_xmss_generate_private_key(k, bits);
1704: break;
1705: #endif /* WITH_XMSS */
1.1 djm 1706: #ifdef WITH_OPENSSL
1707: case KEY_DSA:
1708: ret = dsa_generate_private_key(bits, &k->dsa);
1709: break;
1710: case KEY_ECDSA:
1711: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1712: &k->ecdsa);
1713: break;
1714: case KEY_RSA:
1715: ret = rsa_generate_private_key(bits, &k->rsa);
1716: break;
1717: #endif /* WITH_OPENSSL */
1718: default:
1719: ret = SSH_ERR_INVALID_ARGUMENT;
1720: }
1721: if (ret == 0) {
1722: k->type = type;
1723: *keyp = k;
1724: } else
1725: sshkey_free(k);
1726: return ret;
1727: }
1728:
1729: int
1730: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1731: {
1732: u_int i;
1733: const struct sshkey_cert *from;
1734: struct sshkey_cert *to;
1.67 djm 1735: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1736:
1.67 djm 1737: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1738: return SSH_ERR_INVALID_ARGUMENT;
1739:
1.67 djm 1740: if ((to = cert_new()) == NULL)
1.1 djm 1741: return SSH_ERR_ALLOC_FAIL;
1742:
1.67 djm 1743: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1744: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1745: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1746: goto out;
1.1 djm 1747:
1748: to->serial = from->serial;
1749: to->type = from->type;
1750: if (from->key_id == NULL)
1751: to->key_id = NULL;
1.67 djm 1752: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1753: r = SSH_ERR_ALLOC_FAIL;
1754: goto out;
1755: }
1.1 djm 1756: to->valid_after = from->valid_after;
1757: to->valid_before = from->valid_before;
1758: if (from->signature_key == NULL)
1759: to->signature_key = NULL;
1.67 djm 1760: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1761: &to->signature_key)) != 0)
1.67 djm 1762: goto out;
1763: if (from->signature_type != NULL &&
1764: (to->signature_type = strdup(from->signature_type)) == NULL) {
1765: r = SSH_ERR_ALLOC_FAIL;
1766: goto out;
1767: }
1768: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1769: r = SSH_ERR_INVALID_ARGUMENT;
1770: goto out;
1771: }
1.1 djm 1772: if (from->nprincipals > 0) {
1773: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1774: sizeof(*to->principals))) == NULL) {
1775: r = SSH_ERR_ALLOC_FAIL;
1776: goto out;
1777: }
1.1 djm 1778: for (i = 0; i < from->nprincipals; i++) {
1779: to->principals[i] = strdup(from->principals[i]);
1780: if (to->principals[i] == NULL) {
1781: to->nprincipals = i;
1.67 djm 1782: r = SSH_ERR_ALLOC_FAIL;
1783: goto out;
1.1 djm 1784: }
1785: }
1786: }
1787: to->nprincipals = from->nprincipals;
1.67 djm 1788:
1789: /* success */
1790: cert_free(to_key->cert);
1791: to_key->cert = to;
1792: to = NULL;
1793: r = 0;
1794: out:
1795: cert_free(to);
1796: return r;
1.1 djm 1797: }
1798:
1799: int
1800: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1801: {
1802: struct sshkey *n = NULL;
1.69 djm 1803: int r = SSH_ERR_INTERNAL_ERROR;
1804: #ifdef WITH_OPENSSL
1805: const BIGNUM *rsa_n, *rsa_e;
1806: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1807: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1808: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1809: BIGNUM *dsa_pub_key_dup = NULL;
1810: #endif /* WITH_OPENSSL */
1.1 djm 1811:
1.24 djm 1812: *pkp = NULL;
1.85 djm 1813: if ((n = sshkey_new(k->type)) == NULL) {
1814: r = SSH_ERR_ALLOC_FAIL;
1815: goto out;
1816: }
1.1 djm 1817: switch (k->type) {
1818: #ifdef WITH_OPENSSL
1819: case KEY_DSA:
1820: case KEY_DSA_CERT:
1.69 djm 1821: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1822: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1823: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1824: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1825: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1826: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1827: r = SSH_ERR_ALLOC_FAIL;
1828: goto out;
1829: }
1830: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1831: r = SSH_ERR_LIBCRYPTO_ERROR;
1832: goto out;
1.1 djm 1833: }
1.69 djm 1834: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1835: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1836: r = SSH_ERR_LIBCRYPTO_ERROR;
1837: goto out;
1838: }
1839: dsa_pub_key_dup = NULL; /* transferred */
1840:
1.1 djm 1841: break;
1842: case KEY_ECDSA:
1843: case KEY_ECDSA_CERT:
1.85 djm 1844: case KEY_ECDSA_SK:
1845: case KEY_ECDSA_SK_CERT:
1.1 djm 1846: n->ecdsa_nid = k->ecdsa_nid;
1847: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1848: if (n->ecdsa == NULL) {
1.69 djm 1849: r = SSH_ERR_ALLOC_FAIL;
1850: goto out;
1.1 djm 1851: }
1852: if (EC_KEY_set_public_key(n->ecdsa,
1853: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1854: r = SSH_ERR_LIBCRYPTO_ERROR;
1855: goto out;
1.1 djm 1856: }
1.85 djm 1857: if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT)
1858: break;
1859: /* Append security-key application string */
1860: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1861: goto out;
1.1 djm 1862: break;
1863: case KEY_RSA:
1864: case KEY_RSA_CERT:
1.69 djm 1865: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1866: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1867: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1868: r = SSH_ERR_ALLOC_FAIL;
1869: goto out;
1870: }
1871: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1872: r = SSH_ERR_LIBCRYPTO_ERROR;
1873: goto out;
1874: }
1875: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1876: break;
1877: #endif /* WITH_OPENSSL */
1878: case KEY_ED25519:
1879: case KEY_ED25519_CERT:
1.90 markus 1880: case KEY_ED25519_SK:
1881: case KEY_ED25519_SK_CERT:
1.1 djm 1882: if (k->ed25519_pk != NULL) {
1883: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1884: r = SSH_ERR_ALLOC_FAIL;
1885: goto out;
1.1 djm 1886: }
1887: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1888: }
1.90 markus 1889: if (k->type != KEY_ED25519_SK &&
1890: k->type != KEY_ED25519_SK_CERT)
1891: break;
1892: /* Append security-key application string */
1893: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1894: goto out;
1.1 djm 1895: break;
1.62 markus 1896: #ifdef WITH_XMSS
1897: case KEY_XMSS:
1898: case KEY_XMSS_CERT:
1.69 djm 1899: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1900: goto out;
1.62 markus 1901: if (k->xmss_pk != NULL) {
1.92 markus 1902: u_int32_t left;
1.62 markus 1903: size_t pklen = sshkey_xmss_pklen(k);
1904: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1905: r = SSH_ERR_INTERNAL_ERROR;
1906: goto out;
1.62 markus 1907: }
1908: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1909: r = SSH_ERR_ALLOC_FAIL;
1910: goto out;
1.62 markus 1911: }
1912: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1.92 markus 1913: /* simulate number of signatures left on pubkey */
1914: left = sshkey_xmss_signatures_left(k);
1915: if (left)
1916: sshkey_xmss_enable_maxsign(n, left);
1.62 markus 1917: }
1918: break;
1919: #endif /* WITH_XMSS */
1.1 djm 1920: default:
1.69 djm 1921: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1922: goto out;
1.1 djm 1923: }
1.69 djm 1924: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1925: goto out;
1926: /* success */
1.1 djm 1927: *pkp = n;
1.69 djm 1928: n = NULL;
1929: r = 0;
1930: out:
1931: sshkey_free(n);
1.83 djm 1932: #ifdef WITH_OPENSSL
1.69 djm 1933: BN_clear_free(rsa_n_dup);
1934: BN_clear_free(rsa_e_dup);
1935: BN_clear_free(dsa_p_dup);
1936: BN_clear_free(dsa_q_dup);
1937: BN_clear_free(dsa_g_dup);
1938: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1939: #endif /* WITH_OPENSSL */
1.69 djm 1940:
1941: return r;
1.1 djm 1942: }
1943:
1.76 djm 1944: int
1945: sshkey_is_shielded(struct sshkey *k)
1946: {
1947: return k != NULL && k->shielded_private != NULL;
1948: }
1949:
1950: int
1951: sshkey_shield_private(struct sshkey *k)
1952: {
1953: struct sshbuf *prvbuf = NULL;
1954: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1955: struct sshcipher_ctx *cctx = NULL;
1956: const struct sshcipher *cipher;
1957: size_t i, enclen = 0;
1958: struct sshkey *kswap = NULL, tmp;
1959: int r = SSH_ERR_INTERNAL_ERROR;
1960:
1961: #ifdef DEBUG_PK
1962: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1963: #endif
1964: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1965: r = SSH_ERR_INVALID_ARGUMENT;
1966: goto out;
1967: }
1968: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1969: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1970: r = SSH_ERR_INTERNAL_ERROR;
1971: goto out;
1972: }
1973:
1974: /* Prepare a random pre-key, and from it an ephemeral key */
1975: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1976: r = SSH_ERR_ALLOC_FAIL;
1977: goto out;
1978: }
1979: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1980: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1981: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1982: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1983: goto out;
1984: #ifdef DEBUG_PK
1985: fprintf(stderr, "%s: key+iv\n", __func__);
1986: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1987: stderr);
1988: #endif
1989: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1990: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1991: goto out;
1992:
1993: /* Serialise and encrypt the private key using the ephemeral key */
1994: if ((prvbuf = sshbuf_new()) == NULL) {
1995: r = SSH_ERR_ALLOC_FAIL;
1996: goto out;
1997: }
1998: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1999: goto out;
2000: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.91 markus 2001: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 2002: goto out;
2003: /* pad to cipher blocksize */
2004: i = 0;
2005: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
2006: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
2007: goto out;
2008: }
2009: #ifdef DEBUG_PK
2010: fprintf(stderr, "%s: serialised\n", __func__);
2011: sshbuf_dump(prvbuf, stderr);
2012: #endif
2013: /* encrypt */
2014: enclen = sshbuf_len(prvbuf);
2015: if ((enc = malloc(enclen)) == NULL) {
2016: r = SSH_ERR_ALLOC_FAIL;
2017: goto out;
2018: }
2019: if ((r = cipher_crypt(cctx, 0, enc,
2020: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
2021: goto out;
2022: #ifdef DEBUG_PK
2023: fprintf(stderr, "%s: encrypted\n", __func__);
2024: sshbuf_dump_data(enc, enclen, stderr);
2025: #endif
2026:
2027: /* Make a scrubbed, public-only copy of our private key argument */
2028: if ((r = sshkey_from_private(k, &kswap)) != 0)
2029: goto out;
2030:
2031: /* Swap the private key out (it will be destroyed below) */
2032: tmp = *kswap;
2033: *kswap = *k;
2034: *k = tmp;
2035:
2036: /* Insert the shielded key into our argument */
2037: k->shielded_private = enc;
2038: k->shielded_len = enclen;
2039: k->shield_prekey = prekey;
2040: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
2041: enc = prekey = NULL; /* transferred */
2042: enclen = 0;
2043:
2044: /* success */
2045: r = 0;
2046:
2047: out:
2048: /* XXX behaviour on error - invalidate original private key? */
2049: cipher_free(cctx);
2050: explicit_bzero(keyiv, sizeof(keyiv));
2051: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 2052: freezero(enc, enclen);
1.76 djm 2053: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
2054: sshkey_free(kswap);
2055: sshbuf_free(prvbuf);
2056: return r;
2057: }
2058:
2059: int
2060: sshkey_unshield_private(struct sshkey *k)
2061: {
2062: struct sshbuf *prvbuf = NULL;
2063: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
2064: struct sshcipher_ctx *cctx = NULL;
2065: const struct sshcipher *cipher;
2066: size_t i;
2067: struct sshkey *kswap = NULL, tmp;
2068: int r = SSH_ERR_INTERNAL_ERROR;
2069:
2070: #ifdef DEBUG_PK
2071: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
2072: #endif
2073: if (!sshkey_is_shielded(k))
2074: return 0; /* nothing to do */
2075:
2076: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
2077: r = SSH_ERR_INVALID_ARGUMENT;
2078: goto out;
2079: }
2080: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
2081: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
2082: r = SSH_ERR_INTERNAL_ERROR;
2083: goto out;
2084: }
2085: /* check size of shielded key blob */
2086: if (k->shielded_len < cipher_blocksize(cipher) ||
2087: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
2088: r = SSH_ERR_INVALID_FORMAT;
2089: goto out;
2090: }
2091:
2092: /* Calculate the ephemeral key from the prekey */
2093: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2094: k->shield_prekey, k->shield_prekey_len,
2095: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2096: goto out;
2097: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2098: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2099: goto out;
2100: #ifdef DEBUG_PK
2101: fprintf(stderr, "%s: key+iv\n", __func__);
2102: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2103: stderr);
2104: #endif
2105:
2106: /* Decrypt and parse the shielded private key using the ephemeral key */
2107: if ((prvbuf = sshbuf_new()) == NULL) {
2108: r = SSH_ERR_ALLOC_FAIL;
2109: goto out;
2110: }
2111: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2112: goto out;
2113: /* decrypt */
2114: #ifdef DEBUG_PK
2115: fprintf(stderr, "%s: encrypted\n", __func__);
2116: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2117: #endif
2118: if ((r = cipher_crypt(cctx, 0, cp,
2119: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2120: goto out;
2121: #ifdef DEBUG_PK
2122: fprintf(stderr, "%s: serialised\n", __func__);
2123: sshbuf_dump(prvbuf, stderr);
2124: #endif
2125: /* Parse private key */
2126: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2127: goto out;
2128: /* Check deterministic padding */
2129: i = 0;
2130: while (sshbuf_len(prvbuf)) {
2131: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2132: goto out;
2133: if (pad != (++i & 0xff)) {
2134: r = SSH_ERR_INVALID_FORMAT;
2135: goto out;
2136: }
2137: }
2138:
2139: /* Swap the parsed key back into place */
2140: tmp = *kswap;
2141: *kswap = *k;
2142: *k = tmp;
2143:
2144: /* success */
2145: r = 0;
2146:
2147: out:
2148: cipher_free(cctx);
2149: explicit_bzero(keyiv, sizeof(keyiv));
2150: explicit_bzero(&tmp, sizeof(tmp));
2151: sshkey_free(kswap);
2152: sshbuf_free(prvbuf);
2153: return r;
2154: }
2155:
1.1 djm 2156: static int
1.14 djm 2157: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2158: {
1.14 djm 2159: struct sshbuf *principals = NULL, *crit = NULL;
2160: struct sshbuf *exts = NULL, *ca = NULL;
2161: u_char *sig = NULL;
2162: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2163: int ret = SSH_ERR_INTERNAL_ERROR;
2164:
2165: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2166: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2167: return ret;
2168:
1.20 djm 2169: /* Parse body of certificate up to signature */
2170: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2171: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2172: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2173: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2174: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2175: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2176: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2177: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2178: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2179: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2180: /* XXX debug print error for ret */
2181: ret = SSH_ERR_INVALID_FORMAT;
2182: goto out;
2183: }
2184:
2185: /* Signature is left in the buffer so we can calculate this length */
2186: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2187:
2188: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2189: ret = SSH_ERR_INVALID_FORMAT;
2190: goto out;
2191: }
2192:
2193: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2194: key->cert->type != SSH2_CERT_TYPE_HOST) {
2195: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2196: goto out;
2197: }
2198:
1.4 djm 2199: /* Parse principals section */
2200: while (sshbuf_len(principals) > 0) {
2201: char *principal = NULL;
2202: char **oprincipals = NULL;
2203:
1.1 djm 2204: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2205: ret = SSH_ERR_INVALID_FORMAT;
2206: goto out;
2207: }
1.4 djm 2208: if ((ret = sshbuf_get_cstring(principals, &principal,
2209: NULL)) != 0) {
1.1 djm 2210: ret = SSH_ERR_INVALID_FORMAT;
2211: goto out;
2212: }
2213: oprincipals = key->cert->principals;
1.51 deraadt 2214: key->cert->principals = recallocarray(key->cert->principals,
2215: key->cert->nprincipals, key->cert->nprincipals + 1,
2216: sizeof(*key->cert->principals));
1.1 djm 2217: if (key->cert->principals == NULL) {
2218: free(principal);
2219: key->cert->principals = oprincipals;
2220: ret = SSH_ERR_ALLOC_FAIL;
2221: goto out;
2222: }
2223: key->cert->principals[key->cert->nprincipals++] = principal;
2224: }
2225:
1.4 djm 2226: /*
2227: * Stash a copies of the critical options and extensions sections
2228: * for later use.
2229: */
2230: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2231: (exts != NULL &&
2232: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2233: goto out;
2234:
1.4 djm 2235: /*
2236: * Validate critical options and extensions sections format.
2237: */
2238: while (sshbuf_len(crit) != 0) {
2239: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2240: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2241: sshbuf_reset(key->cert->critical);
1.1 djm 2242: ret = SSH_ERR_INVALID_FORMAT;
2243: goto out;
2244: }
2245: }
1.4 djm 2246: while (exts != NULL && sshbuf_len(exts) != 0) {
2247: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2248: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2249: sshbuf_reset(key->cert->extensions);
1.1 djm 2250: ret = SSH_ERR_INVALID_FORMAT;
2251: goto out;
2252: }
2253: }
2254:
1.4 djm 2255: /* Parse CA key and check signature */
1.14 djm 2256: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2257: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2258: goto out;
2259: }
2260: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2261: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2262: goto out;
2263: }
2264: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 ! djm 2265: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 2266: goto out;
1.82 djm 2267: if ((ret = sshkey_get_sigtype(sig, slen,
2268: &key->cert->signature_type)) != 0)
1.67 djm 2269: goto out;
1.4 djm 2270:
2271: /* Success */
1.1 djm 2272: ret = 0;
2273: out:
1.14 djm 2274: sshbuf_free(ca);
1.4 djm 2275: sshbuf_free(crit);
2276: sshbuf_free(exts);
2277: sshbuf_free(principals);
1.1 djm 2278: free(sig);
2279: return ret;
2280: }
2281:
1.83 djm 2282: #ifdef WITH_OPENSSL
1.1 djm 2283: static int
1.69 djm 2284: check_rsa_length(const RSA *rsa)
2285: {
2286: const BIGNUM *rsa_n;
2287:
2288: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2289: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2290: return SSH_ERR_KEY_LENGTH;
2291: return 0;
2292: }
1.83 djm 2293: #endif /* WITH_OPENSSL */
1.69 djm 2294:
2295: static int
1.14 djm 2296: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2297: int allow_cert)
1.1 djm 2298: {
1.12 djm 2299: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2300: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2301: struct sshkey *key = NULL;
2302: size_t len;
2303: u_char *pk = NULL;
1.14 djm 2304: struct sshbuf *copy;
1.1 djm 2305: #ifdef WITH_OPENSSL
2306: EC_POINT *q = NULL;
1.69 djm 2307: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2308: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2309: #endif /* WITH_OPENSSL */
2310:
2311: #ifdef DEBUG_PK /* XXX */
1.14 djm 2312: sshbuf_dump(b, stderr);
1.1 djm 2313: #endif
1.32 djm 2314: if (keyp != NULL)
2315: *keyp = NULL;
1.14 djm 2316: if ((copy = sshbuf_fromb(b)) == NULL) {
2317: ret = SSH_ERR_ALLOC_FAIL;
2318: goto out;
2319: }
1.1 djm 2320: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2321: ret = SSH_ERR_INVALID_FORMAT;
2322: goto out;
2323: }
2324:
2325: type = sshkey_type_from_name(ktype);
2326: if (!allow_cert && sshkey_type_is_cert(type)) {
2327: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2328: goto out;
2329: }
2330: switch (type) {
2331: #ifdef WITH_OPENSSL
2332: case KEY_RSA_CERT:
1.14 djm 2333: /* Skip nonce */
1.1 djm 2334: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2335: ret = SSH_ERR_INVALID_FORMAT;
2336: goto out;
2337: }
2338: /* FALLTHROUGH */
2339: case KEY_RSA:
2340: if ((key = sshkey_new(type)) == NULL) {
2341: ret = SSH_ERR_ALLOC_FAIL;
2342: goto out;
2343: }
1.73 djm 2344: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2345: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2346: ret = SSH_ERR_INVALID_FORMAT;
2347: goto out;
2348: }
1.69 djm 2349: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2350: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2351: goto out;
2352: }
1.69 djm 2353: rsa_n = rsa_e = NULL; /* transferred */
2354: if ((ret = check_rsa_length(key->rsa)) != 0)
2355: goto out;
1.1 djm 2356: #ifdef DEBUG_PK
2357: RSA_print_fp(stderr, key->rsa, 8);
2358: #endif
2359: break;
2360: case KEY_DSA_CERT:
1.14 djm 2361: /* Skip nonce */
1.1 djm 2362: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2363: ret = SSH_ERR_INVALID_FORMAT;
2364: goto out;
2365: }
2366: /* FALLTHROUGH */
2367: case KEY_DSA:
2368: if ((key = sshkey_new(type)) == NULL) {
2369: ret = SSH_ERR_ALLOC_FAIL;
2370: goto out;
2371: }
1.73 djm 2372: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2373: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2374: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2375: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2376: ret = SSH_ERR_INVALID_FORMAT;
2377: goto out;
2378: }
1.69 djm 2379: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2380: ret = SSH_ERR_LIBCRYPTO_ERROR;
2381: goto out;
2382: }
2383: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2384: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2385: ret = SSH_ERR_LIBCRYPTO_ERROR;
2386: goto out;
2387: }
2388: dsa_pub_key = NULL; /* transferred */
1.1 djm 2389: #ifdef DEBUG_PK
2390: DSA_print_fp(stderr, key->dsa, 8);
2391: #endif
2392: break;
2393: case KEY_ECDSA_CERT:
1.85 djm 2394: case KEY_ECDSA_SK_CERT:
1.14 djm 2395: /* Skip nonce */
1.1 djm 2396: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2397: ret = SSH_ERR_INVALID_FORMAT;
2398: goto out;
2399: }
2400: /* FALLTHROUGH */
2401: case KEY_ECDSA:
1.85 djm 2402: case KEY_ECDSA_SK:
1.1 djm 2403: if ((key = sshkey_new(type)) == NULL) {
2404: ret = SSH_ERR_ALLOC_FAIL;
2405: goto out;
2406: }
1.12 djm 2407: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2408: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2409: ret = SSH_ERR_INVALID_FORMAT;
2410: goto out;
2411: }
2412: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2413: ret = SSH_ERR_EC_CURVE_MISMATCH;
2414: goto out;
2415: }
1.60 jsing 2416: EC_KEY_free(key->ecdsa);
1.1 djm 2417: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2418: == NULL) {
2419: ret = SSH_ERR_EC_CURVE_INVALID;
2420: goto out;
2421: }
2422: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2423: ret = SSH_ERR_ALLOC_FAIL;
2424: goto out;
2425: }
2426: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2427: ret = SSH_ERR_INVALID_FORMAT;
2428: goto out;
2429: }
2430: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2431: q) != 0) {
2432: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2433: goto out;
2434: }
2435: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2436: /* XXX assume it is a allocation error */
2437: ret = SSH_ERR_ALLOC_FAIL;
2438: goto out;
2439: }
2440: #ifdef DEBUG_PK
2441: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2442: #endif
1.85 djm 2443: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2444: /* Parse additional security-key application string */
2445: if (sshbuf_get_cstring(b, &key->sk_application,
2446: NULL) != 0) {
2447: ret = SSH_ERR_INVALID_FORMAT;
2448: goto out;
2449: }
2450: #ifdef DEBUG_PK
2451: fprintf(stderr, "App: %s\n", key->sk_application);
2452: #endif
2453: }
1.1 djm 2454: break;
2455: #endif /* WITH_OPENSSL */
2456: case KEY_ED25519_CERT:
1.90 markus 2457: case KEY_ED25519_SK_CERT:
1.14 djm 2458: /* Skip nonce */
1.1 djm 2459: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2460: ret = SSH_ERR_INVALID_FORMAT;
2461: goto out;
2462: }
2463: /* FALLTHROUGH */
2464: case KEY_ED25519:
1.90 markus 2465: case KEY_ED25519_SK:
1.1 djm 2466: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2467: goto out;
2468: if (len != ED25519_PK_SZ) {
2469: ret = SSH_ERR_INVALID_FORMAT;
2470: goto out;
2471: }
2472: if ((key = sshkey_new(type)) == NULL) {
2473: ret = SSH_ERR_ALLOC_FAIL;
2474: goto out;
2475: }
1.90 markus 2476: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2477: /* Parse additional security-key application string */
2478: if (sshbuf_get_cstring(b, &key->sk_application,
2479: NULL) != 0) {
2480: ret = SSH_ERR_INVALID_FORMAT;
2481: goto out;
2482: }
2483: #ifdef DEBUG_PK
2484: fprintf(stderr, "App: %s\n", key->sk_application);
2485: #endif
2486: }
1.1 djm 2487: key->ed25519_pk = pk;
2488: pk = NULL;
2489: break;
1.62 markus 2490: #ifdef WITH_XMSS
2491: case KEY_XMSS_CERT:
2492: /* Skip nonce */
2493: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2494: ret = SSH_ERR_INVALID_FORMAT;
2495: goto out;
2496: }
2497: /* FALLTHROUGH */
2498: case KEY_XMSS:
2499: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2500: goto out;
2501: if ((key = sshkey_new(type)) == NULL) {
2502: ret = SSH_ERR_ALLOC_FAIL;
2503: goto out;
2504: }
2505: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2506: goto out;
2507: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2508: goto out;
2509: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2510: ret = SSH_ERR_INVALID_FORMAT;
2511: goto out;
2512: }
2513: key->xmss_pk = pk;
2514: pk = NULL;
2515: if (type != KEY_XMSS_CERT &&
2516: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2517: goto out;
2518: break;
2519: #endif /* WITH_XMSS */
1.1 djm 2520: case KEY_UNSPEC:
2521: default:
2522: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2523: goto out;
2524: }
2525:
2526: /* Parse certificate potion */
1.14 djm 2527: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2528: goto out;
2529:
2530: if (key != NULL && sshbuf_len(b) != 0) {
2531: ret = SSH_ERR_INVALID_FORMAT;
2532: goto out;
2533: }
2534: ret = 0;
1.32 djm 2535: if (keyp != NULL) {
2536: *keyp = key;
2537: key = NULL;
2538: }
1.1 djm 2539: out:
1.14 djm 2540: sshbuf_free(copy);
1.1 djm 2541: sshkey_free(key);
1.62 markus 2542: free(xmss_name);
1.1 djm 2543: free(ktype);
2544: free(curve);
2545: free(pk);
2546: #ifdef WITH_OPENSSL
1.60 jsing 2547: EC_POINT_free(q);
1.69 djm 2548: BN_clear_free(rsa_n);
2549: BN_clear_free(rsa_e);
2550: BN_clear_free(dsa_p);
2551: BN_clear_free(dsa_q);
2552: BN_clear_free(dsa_g);
2553: BN_clear_free(dsa_pub_key);
1.1 djm 2554: #endif /* WITH_OPENSSL */
2555: return ret;
2556: }
2557:
2558: int
2559: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2560: {
1.14 djm 2561: struct sshbuf *b;
2562: int r;
2563:
2564: if ((b = sshbuf_from(blob, blen)) == NULL)
2565: return SSH_ERR_ALLOC_FAIL;
2566: r = sshkey_from_blob_internal(b, keyp, 1);
2567: sshbuf_free(b);
2568: return r;
2569: }
2570:
2571: int
2572: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2573: {
2574: return sshkey_from_blob_internal(b, keyp, 1);
2575: }
2576:
2577: int
2578: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2579: {
2580: struct sshbuf *b;
2581: int r;
2582:
2583: if ((r = sshbuf_froms(buf, &b)) != 0)
2584: return r;
2585: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2586: sshbuf_free(b);
2587: return r;
2588: }
2589:
1.82 djm 2590: int
2591: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2592: {
2593: int r;
2594: struct sshbuf *b = NULL;
2595: char *sigtype = NULL;
2596:
2597: if (sigtypep != NULL)
2598: *sigtypep = NULL;
2599: if ((b = sshbuf_from(sig, siglen)) == NULL)
2600: return SSH_ERR_ALLOC_FAIL;
2601: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2602: goto out;
2603: /* success */
2604: if (sigtypep != NULL) {
2605: *sigtypep = sigtype;
2606: sigtype = NULL;
2607: }
2608: r = 0;
2609: out:
2610: free(sigtype);
1.14 djm 2611: sshbuf_free(b);
2612: return r;
1.68 djm 2613: }
2614:
2615: /*
2616: *
2617: * Checks whether a certificate's signature type is allowed.
2618: * Returns 0 (success) if the certificate signature type appears in the
2619: * "allowed" pattern-list, or the key is not a certificate to begin with.
2620: * Otherwise returns a ssherr.h code.
2621: */
2622: int
2623: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2624: {
2625: if (key == NULL || allowed == NULL)
2626: return SSH_ERR_INVALID_ARGUMENT;
2627: if (!sshkey_type_is_cert(key->type))
2628: return 0;
2629: if (key->cert == NULL || key->cert->signature_type == NULL)
2630: return SSH_ERR_INVALID_ARGUMENT;
2631: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2632: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2633: return 0;
1.65 djm 2634: }
2635:
2636: /*
2637: * Returns the expected signature algorithm for a given public key algorithm.
2638: */
1.66 djm 2639: const char *
2640: sshkey_sigalg_by_name(const char *name)
1.65 djm 2641: {
2642: const struct keytype *kt;
2643:
2644: for (kt = keytypes; kt->type != -1; kt++) {
2645: if (strcmp(kt->name, name) != 0)
2646: continue;
2647: if (kt->sigalg != NULL)
2648: return kt->sigalg;
2649: if (!kt->cert)
2650: return kt->name;
2651: return sshkey_ssh_name_from_type_nid(
2652: sshkey_type_plain(kt->type), kt->nid);
2653: }
2654: return NULL;
2655: }
2656:
2657: /*
2658: * Verifies that the signature algorithm appearing inside the signature blob
2659: * matches that which was requested.
2660: */
2661: int
2662: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2663: const char *requested_alg)
2664: {
2665: const char *expected_alg;
2666: char *sigtype = NULL;
2667: int r;
2668:
2669: if (requested_alg == NULL)
2670: return 0;
1.66 djm 2671: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2672: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2673: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2674: return r;
2675: r = strcmp(expected_alg, sigtype) == 0;
2676: free(sigtype);
2677: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2678: }
2679:
2680: int
1.76 djm 2681: sshkey_sign(struct sshkey *key,
1.1 djm 2682: u_char **sigp, size_t *lenp,
1.86 djm 2683: const u_char *data, size_t datalen,
2684: const char *alg, const char *sk_provider, u_int compat)
1.1 djm 2685: {
1.76 djm 2686: int was_shielded = sshkey_is_shielded(key);
2687: int r2, r = SSH_ERR_INTERNAL_ERROR;
2688:
1.1 djm 2689: if (sigp != NULL)
2690: *sigp = NULL;
2691: if (lenp != NULL)
2692: *lenp = 0;
2693: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2694: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2695: if ((r = sshkey_unshield_private(key)) != 0)
2696: return r;
1.1 djm 2697: switch (key->type) {
2698: #ifdef WITH_OPENSSL
2699: case KEY_DSA_CERT:
2700: case KEY_DSA:
1.76 djm 2701: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2702: break;
1.1 djm 2703: case KEY_ECDSA_CERT:
2704: case KEY_ECDSA:
1.76 djm 2705: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2706: break;
1.86 djm 2707: case KEY_ECDSA_SK_CERT:
2708: case KEY_ECDSA_SK:
1.88 markus 2709: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2710: compat);
1.86 djm 2711: break;
1.1 djm 2712: case KEY_RSA_CERT:
2713: case KEY_RSA:
1.76 djm 2714: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2715: break;
1.1 djm 2716: #endif /* WITH_OPENSSL */
2717: case KEY_ED25519:
2718: case KEY_ED25519_CERT:
1.76 djm 2719: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2720: break;
2721: case KEY_ED25519_SK:
2722: case KEY_ED25519_SK_CERT:
2723: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2724: compat);
1.76 djm 2725: break;
1.62 markus 2726: #ifdef WITH_XMSS
2727: case KEY_XMSS:
2728: case KEY_XMSS_CERT:
1.76 djm 2729: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2730: break;
1.62 markus 2731: #endif /* WITH_XMSS */
1.1 djm 2732: default:
1.76 djm 2733: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2734: break;
1.1 djm 2735: }
1.76 djm 2736: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2737: return r2;
2738: return r;
1.1 djm 2739: }
2740:
2741: /*
2742: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2743: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2744: */
2745: int
2746: sshkey_verify(const struct sshkey *key,
2747: const u_char *sig, size_t siglen,
1.96 ! djm 2748: const u_char *data, size_t dlen, const char *alg, u_int compat,
! 2749: struct sshkey_sig_details **detailsp)
1.1 djm 2750: {
1.96 ! djm 2751: if (detailsp != NULL)
! 2752: *detailsp = NULL;
1.6 djm 2753: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2754: return SSH_ERR_INVALID_ARGUMENT;
2755: switch (key->type) {
2756: #ifdef WITH_OPENSSL
2757: case KEY_DSA_CERT:
2758: case KEY_DSA:
2759: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2760: case KEY_ECDSA_CERT:
2761: case KEY_ECDSA:
2762: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2763: case KEY_ECDSA_SK_CERT:
2764: case KEY_ECDSA_SK:
2765: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
1.96 ! djm 2766: compat, detailsp);
1.1 djm 2767: case KEY_RSA_CERT:
2768: case KEY_RSA:
1.59 djm 2769: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2770: #endif /* WITH_OPENSSL */
2771: case KEY_ED25519:
2772: case KEY_ED25519_CERT:
2773: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2774: case KEY_ED25519_SK:
2775: case KEY_ED25519_SK_CERT:
2776: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
1.96 ! djm 2777: compat, detailsp);
1.62 markus 2778: #ifdef WITH_XMSS
2779: case KEY_XMSS:
2780: case KEY_XMSS_CERT:
2781: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2782: #endif /* WITH_XMSS */
1.1 djm 2783: default:
2784: return SSH_ERR_KEY_TYPE_UNKNOWN;
2785: }
2786: }
2787:
2788: /* Convert a plain key to their _CERT equivalent */
2789: int
1.20 djm 2790: sshkey_to_certified(struct sshkey *k)
1.1 djm 2791: {
2792: int newtype;
2793:
2794: switch (k->type) {
2795: #ifdef WITH_OPENSSL
2796: case KEY_RSA:
1.20 djm 2797: newtype = KEY_RSA_CERT;
1.1 djm 2798: break;
2799: case KEY_DSA:
1.20 djm 2800: newtype = KEY_DSA_CERT;
1.1 djm 2801: break;
2802: case KEY_ECDSA:
2803: newtype = KEY_ECDSA_CERT;
2804: break;
1.85 djm 2805: case KEY_ECDSA_SK:
2806: newtype = KEY_ECDSA_SK_CERT;
2807: break;
1.1 djm 2808: #endif /* WITH_OPENSSL */
1.90 markus 2809: case KEY_ED25519_SK:
2810: newtype = KEY_ED25519_SK_CERT;
2811: break;
1.1 djm 2812: case KEY_ED25519:
2813: newtype = KEY_ED25519_CERT;
2814: break;
1.62 markus 2815: #ifdef WITH_XMSS
2816: case KEY_XMSS:
2817: newtype = KEY_XMSS_CERT;
2818: break;
2819: #endif /* WITH_XMSS */
1.1 djm 2820: default:
2821: return SSH_ERR_INVALID_ARGUMENT;
2822: }
2823: if ((k->cert = cert_new()) == NULL)
2824: return SSH_ERR_ALLOC_FAIL;
2825: k->type = newtype;
2826: return 0;
2827: }
2828:
2829: /* Convert a certificate to its raw key equivalent */
2830: int
2831: sshkey_drop_cert(struct sshkey *k)
2832: {
2833: if (!sshkey_type_is_cert(k->type))
2834: return SSH_ERR_KEY_TYPE_UNKNOWN;
2835: cert_free(k->cert);
2836: k->cert = NULL;
2837: k->type = sshkey_type_plain(k->type);
2838: return 0;
2839: }
2840:
2841: /* Sign a certified key, (re-)generating the signed certblob. */
2842: int
1.53 djm 2843: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.86 djm 2844: const char *sk_provider, sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2845: {
2846: struct sshbuf *principals = NULL;
2847: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2848: size_t i, ca_len, sig_len;
2849: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2850: struct sshbuf *cert = NULL;
2851: char *sigtype = NULL;
1.69 djm 2852: #ifdef WITH_OPENSSL
2853: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2854: #endif /* WITH_OPENSSL */
1.1 djm 2855:
2856: if (k == NULL || k->cert == NULL ||
2857: k->cert->certblob == NULL || ca == NULL)
2858: return SSH_ERR_INVALID_ARGUMENT;
2859: if (!sshkey_is_cert(k))
2860: return SSH_ERR_KEY_TYPE_UNKNOWN;
2861: if (!sshkey_type_is_valid_ca(ca->type))
2862: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2863:
1.67 djm 2864: /*
2865: * If no alg specified as argument but a signature_type was set,
2866: * then prefer that. If both were specified, then they must match.
2867: */
2868: if (alg == NULL)
2869: alg = k->cert->signature_type;
2870: else if (k->cert->signature_type != NULL &&
2871: strcmp(alg, k->cert->signature_type) != 0)
2872: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2873:
2874: /*
2875: * If no signing algorithm or signature_type was specified and we're
2876: * using a RSA key, then default to a good signature algorithm.
2877: */
2878: if (alg == NULL && ca->type == KEY_RSA)
2879: alg = "rsa-sha2-512";
1.67 djm 2880:
1.1 djm 2881: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2882: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2883:
2884: cert = k->cert->certblob; /* for readability */
2885: sshbuf_reset(cert);
2886: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2887: goto out;
2888:
2889: /* -v01 certs put nonce first */
2890: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2891: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2892: goto out;
1.1 djm 2893:
2894: /* XXX this substantially duplicates to_blob(); refactor */
2895: switch (k->type) {
2896: #ifdef WITH_OPENSSL
2897: case KEY_DSA_CERT:
1.69 djm 2898: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2899: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2900: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2901: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2902: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2903: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2904: goto out;
2905: break;
2906: case KEY_ECDSA_CERT:
1.85 djm 2907: case KEY_ECDSA_SK_CERT:
1.1 djm 2908: if ((ret = sshbuf_put_cstring(cert,
2909: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2910: (ret = sshbuf_put_ec(cert,
2911: EC_KEY_get0_public_key(k->ecdsa),
2912: EC_KEY_get0_group(k->ecdsa))) != 0)
2913: goto out;
1.85 djm 2914: if (k->type == KEY_ECDSA_SK_CERT) {
2915: if ((ret = sshbuf_put_cstring(cert,
2916: k->sk_application)) != 0)
2917: goto out;
2918: }
1.1 djm 2919: break;
2920: case KEY_RSA_CERT:
1.69 djm 2921: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2922: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2923: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2924: goto out;
2925: break;
2926: #endif /* WITH_OPENSSL */
2927: case KEY_ED25519_CERT:
1.94 djm 2928: case KEY_ED25519_SK_CERT:
1.1 djm 2929: if ((ret = sshbuf_put_string(cert,
2930: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2931: goto out;
1.94 djm 2932: if (k->type == KEY_ED25519_SK_CERT) {
2933: if ((ret = sshbuf_put_cstring(cert,
2934: k->sk_application)) != 0)
2935: goto out;
2936: }
1.1 djm 2937: break;
1.62 markus 2938: #ifdef WITH_XMSS
2939: case KEY_XMSS_CERT:
2940: if (k->xmss_name == NULL) {
2941: ret = SSH_ERR_INVALID_ARGUMENT;
2942: goto out;
2943: }
2944: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2945: (ret = sshbuf_put_string(cert,
2946: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2947: goto out;
2948: break;
2949: #endif /* WITH_XMSS */
1.1 djm 2950: default:
2951: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2952: goto out;
1.1 djm 2953: }
2954:
1.20 djm 2955: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2956: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2957: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2958: goto out;
2959:
2960: if ((principals = sshbuf_new()) == NULL) {
2961: ret = SSH_ERR_ALLOC_FAIL;
2962: goto out;
2963: }
2964: for (i = 0; i < k->cert->nprincipals; i++) {
2965: if ((ret = sshbuf_put_cstring(principals,
2966: k->cert->principals[i])) != 0)
2967: goto out;
2968: }
2969: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2970: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2971: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2972: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2973: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2974: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2975: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2976: goto out;
2977:
2978: /* Sign the whole mess */
1.53 djm 2979: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.86 djm 2980: sshbuf_len(cert), alg, sk_provider, 0, signer_ctx)) != 0)
1.1 djm 2981: goto out;
1.67 djm 2982: /* Check and update signature_type against what was actually used */
1.82 djm 2983: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2984: goto out;
2985: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2986: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2987: goto out;
2988: }
2989: if (k->cert->signature_type == NULL) {
2990: k->cert->signature_type = sigtype;
2991: sigtype = NULL;
2992: }
1.1 djm 2993: /* Append signature and we are done */
2994: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2995: goto out;
2996: ret = 0;
2997: out:
2998: if (ret != 0)
2999: sshbuf_reset(cert);
1.29 mmcc 3000: free(sig_blob);
3001: free(ca_blob);
1.67 djm 3002: free(sigtype);
1.31 mmcc 3003: sshbuf_free(principals);
1.1 djm 3004: return ret;
1.53 djm 3005: }
3006:
3007: static int
1.76 djm 3008: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 3009: const u_char *data, size_t datalen,
1.86 djm 3010: const char *alg, const char *sk_provider, u_int compat, void *ctx)
1.53 djm 3011: {
3012: if (ctx != NULL)
3013: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 3014: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
3015: sk_provider, compat);
1.53 djm 3016: }
3017:
3018: int
1.86 djm 3019: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
3020: const char *sk_provider)
1.53 djm 3021: {
1.86 djm 3022: return sshkey_certify_custom(k, ca, alg, sk_provider,
3023: default_key_sign, NULL);
1.1 djm 3024: }
3025:
3026: int
3027: sshkey_cert_check_authority(const struct sshkey *k,
3028: int want_host, int require_principal,
3029: const char *name, const char **reason)
3030: {
3031: u_int i, principal_matches;
3032: time_t now = time(NULL);
3033:
3034: if (reason != NULL)
3035: *reason = NULL;
3036:
3037: if (want_host) {
3038: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
3039: *reason = "Certificate invalid: not a host certificate";
3040: return SSH_ERR_KEY_CERT_INVALID;
3041: }
3042: } else {
3043: if (k->cert->type != SSH2_CERT_TYPE_USER) {
3044: *reason = "Certificate invalid: not a user certificate";
3045: return SSH_ERR_KEY_CERT_INVALID;
3046: }
3047: }
3048: if (now < 0) {
3049: /* yikes - system clock before epoch! */
3050: *reason = "Certificate invalid: not yet valid";
3051: return SSH_ERR_KEY_CERT_INVALID;
3052: }
3053: if ((u_int64_t)now < k->cert->valid_after) {
3054: *reason = "Certificate invalid: not yet valid";
3055: return SSH_ERR_KEY_CERT_INVALID;
3056: }
3057: if ((u_int64_t)now >= k->cert->valid_before) {
3058: *reason = "Certificate invalid: expired";
3059: return SSH_ERR_KEY_CERT_INVALID;
3060: }
3061: if (k->cert->nprincipals == 0) {
3062: if (require_principal) {
3063: *reason = "Certificate lacks principal list";
3064: return SSH_ERR_KEY_CERT_INVALID;
3065: }
3066: } else if (name != NULL) {
3067: principal_matches = 0;
3068: for (i = 0; i < k->cert->nprincipals; i++) {
3069: if (strcmp(name, k->cert->principals[i]) == 0) {
3070: principal_matches = 1;
3071: break;
3072: }
3073: }
3074: if (!principal_matches) {
3075: *reason = "Certificate invalid: name is not a listed "
3076: "principal";
3077: return SSH_ERR_KEY_CERT_INVALID;
3078: }
3079: }
3080: return 0;
1.27 djm 3081: }
3082:
3083: size_t
3084: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
3085: {
3086: char from[32], to[32], ret[64];
3087: time_t tt;
3088: struct tm *tm;
3089:
3090: *from = *to = '\0';
3091: if (cert->valid_after == 0 &&
3092: cert->valid_before == 0xffffffffffffffffULL)
3093: return strlcpy(s, "forever", l);
3094:
3095: if (cert->valid_after != 0) {
3096: /* XXX revisit INT_MAX in 2038 :) */
3097: tt = cert->valid_after > INT_MAX ?
3098: INT_MAX : cert->valid_after;
3099: tm = localtime(&tt);
3100: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
3101: }
3102: if (cert->valid_before != 0xffffffffffffffffULL) {
3103: /* XXX revisit INT_MAX in 2038 :) */
3104: tt = cert->valid_before > INT_MAX ?
3105: INT_MAX : cert->valid_before;
3106: tm = localtime(&tt);
3107: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
3108: }
3109:
3110: if (cert->valid_after == 0)
3111: snprintf(ret, sizeof(ret), "before %s", to);
3112: else if (cert->valid_before == 0xffffffffffffffffULL)
3113: snprintf(ret, sizeof(ret), "after %s", from);
3114: else
3115: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
3116:
3117: return strlcpy(s, ret, l);
1.1 djm 3118: }
3119:
3120: int
1.76 djm 3121: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 3122: enum sshkey_serialize_rep opts)
1.1 djm 3123: {
3124: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 3125: int was_shielded = sshkey_is_shielded(key);
3126: struct sshbuf *b = NULL;
1.69 djm 3127: #ifdef WITH_OPENSSL
3128: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
3129: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
3130: #endif /* WITH_OPENSSL */
1.1 djm 3131:
1.76 djm 3132: if ((r = sshkey_unshield_private(key)) != 0)
3133: return r;
3134: if ((b = sshbuf_new()) == NULL)
3135: return SSH_ERR_ALLOC_FAIL;
1.1 djm 3136: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
3137: goto out;
3138: switch (key->type) {
3139: #ifdef WITH_OPENSSL
3140: case KEY_RSA:
1.69 djm 3141: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
3142: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3143: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
3144: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
3145: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
3146: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3147: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3148: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3149: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3150: goto out;
3151: break;
3152: case KEY_RSA_CERT:
3153: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3154: r = SSH_ERR_INVALID_ARGUMENT;
3155: goto out;
3156: }
1.69 djm 3157: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
3158: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3159: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 3160: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3161: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3162: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3163: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3164: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3165: goto out;
3166: break;
3167: case KEY_DSA:
1.69 djm 3168: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
3169: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
3170: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
3171: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
3172: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
3173: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3174: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3175: goto out;
3176: break;
3177: case KEY_DSA_CERT:
3178: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3179: r = SSH_ERR_INVALID_ARGUMENT;
3180: goto out;
3181: }
1.69 djm 3182: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3183: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3184: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3185: goto out;
3186: break;
3187: case KEY_ECDSA:
3188: if ((r = sshbuf_put_cstring(b,
3189: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3190: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3191: (r = sshbuf_put_bignum2(b,
3192: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3193: goto out;
3194: break;
3195: case KEY_ECDSA_CERT:
3196: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3197: r = SSH_ERR_INVALID_ARGUMENT;
3198: goto out;
3199: }
3200: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3201: (r = sshbuf_put_bignum2(b,
3202: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3203: goto out;
3204: break;
1.85 djm 3205: case KEY_ECDSA_SK:
3206: if ((r = sshbuf_put_cstring(b,
3207: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3208: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3209: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3210: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3211: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3212: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3213: goto out;
3214: break;
3215: case KEY_ECDSA_SK_CERT:
3216: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3217: r = SSH_ERR_INVALID_ARGUMENT;
3218: goto out;
3219: }
3220: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3221: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3222: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3223: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3224: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3225: goto out;
3226: break;
1.1 djm 3227: #endif /* WITH_OPENSSL */
3228: case KEY_ED25519:
3229: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3230: ED25519_PK_SZ)) != 0 ||
3231: (r = sshbuf_put_string(b, key->ed25519_sk,
3232: ED25519_SK_SZ)) != 0)
3233: goto out;
3234: break;
3235: case KEY_ED25519_CERT:
3236: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3237: r = SSH_ERR_INVALID_ARGUMENT;
3238: goto out;
3239: }
3240: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3241: (r = sshbuf_put_string(b, key->ed25519_pk,
3242: ED25519_PK_SZ)) != 0 ||
3243: (r = sshbuf_put_string(b, key->ed25519_sk,
3244: ED25519_SK_SZ)) != 0)
3245: goto out;
3246: break;
1.90 markus 3247: case KEY_ED25519_SK:
3248: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3249: ED25519_PK_SZ)) != 0 ||
3250: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3251: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3252: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3253: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3254: goto out;
3255: break;
3256: case KEY_ED25519_SK_CERT:
3257: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3258: r = SSH_ERR_INVALID_ARGUMENT;
3259: goto out;
3260: }
3261: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3262: (r = sshbuf_put_string(b, key->ed25519_pk,
3263: ED25519_PK_SZ)) != 0 ||
3264: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3265: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3266: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3267: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3268: goto out;
3269: break;
1.62 markus 3270: #ifdef WITH_XMSS
3271: case KEY_XMSS:
3272: if (key->xmss_name == NULL) {
3273: r = SSH_ERR_INVALID_ARGUMENT;
3274: goto out;
3275: }
3276: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3277: (r = sshbuf_put_string(b, key->xmss_pk,
3278: sshkey_xmss_pklen(key))) != 0 ||
3279: (r = sshbuf_put_string(b, key->xmss_sk,
3280: sshkey_xmss_sklen(key))) != 0 ||
3281: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3282: goto out;
3283: break;
3284: case KEY_XMSS_CERT:
3285: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3286: key->xmss_name == NULL) {
3287: r = SSH_ERR_INVALID_ARGUMENT;
3288: goto out;
3289: }
3290: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3291: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3292: (r = sshbuf_put_string(b, key->xmss_pk,
3293: sshkey_xmss_pklen(key))) != 0 ||
3294: (r = sshbuf_put_string(b, key->xmss_sk,
3295: sshkey_xmss_sklen(key))) != 0 ||
3296: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3297: goto out;
3298: break;
3299: #endif /* WITH_XMSS */
1.1 djm 3300: default:
3301: r = SSH_ERR_INVALID_ARGUMENT;
3302: goto out;
3303: }
1.76 djm 3304: /*
3305: * success (but we still need to append the output to buf after
3306: * possibly re-shielding the private key)
3307: */
1.1 djm 3308: r = 0;
3309: out:
1.76 djm 3310: if (was_shielded)
3311: r = sshkey_shield_private(key);
3312: if (r == 0)
3313: r = sshbuf_putb(buf, b);
3314: sshbuf_free(b);
3315:
1.1 djm 3316: return r;
3317: }
3318:
3319: int
1.76 djm 3320: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3321: {
3322: return sshkey_private_serialize_opt(key, b,
3323: SSHKEY_SERIALIZE_DEFAULT);
3324: }
3325:
3326: int
1.1 djm 3327: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3328: {
1.62 markus 3329: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3330: struct sshkey *k = NULL;
1.14 djm 3331: size_t pklen = 0, sklen = 0;
1.1 djm 3332: int type, r = SSH_ERR_INTERNAL_ERROR;
3333: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3334: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3335: #ifdef WITH_OPENSSL
3336: BIGNUM *exponent = NULL;
1.69 djm 3337: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3338: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3339: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3340: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3341: #endif /* WITH_OPENSSL */
3342:
3343: if (kp != NULL)
3344: *kp = NULL;
3345: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3346: goto out;
3347: type = sshkey_type_from_name(tname);
3348: switch (type) {
3349: #ifdef WITH_OPENSSL
3350: case KEY_DSA:
1.70 djm 3351: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3352: r = SSH_ERR_ALLOC_FAIL;
3353: goto out;
3354: }
1.73 djm 3355: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3356: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3357: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3358: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3359: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3360: goto out;
3361: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3362: r = SSH_ERR_LIBCRYPTO_ERROR;
3363: goto out;
3364: }
3365: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3366: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3367: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3368: goto out;
1.69 djm 3369: }
3370: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3371: break;
3372: case KEY_DSA_CERT:
1.14 djm 3373: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3374: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3375: goto out;
1.84 djm 3376: if (k->type != type) {
3377: r = SSH_ERR_INVALID_FORMAT;
3378: goto out;
3379: }
1.69 djm 3380: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3381: r = SSH_ERR_LIBCRYPTO_ERROR;
3382: goto out;
3383: }
3384: dsa_priv_key = NULL; /* transferred */
1.1 djm 3385: break;
3386: case KEY_ECDSA:
1.70 djm 3387: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3388: r = SSH_ERR_ALLOC_FAIL;
3389: goto out;
3390: }
3391: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3392: r = SSH_ERR_INVALID_ARGUMENT;
3393: goto out;
3394: }
3395: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3396: goto out;
3397: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3398: r = SSH_ERR_EC_CURVE_MISMATCH;
3399: goto out;
3400: }
3401: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3402: if (k->ecdsa == NULL) {
1.1 djm 3403: r = SSH_ERR_LIBCRYPTO_ERROR;
3404: goto out;
3405: }
3406: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3407: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3408: goto out;
3409: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3410: r = SSH_ERR_LIBCRYPTO_ERROR;
3411: goto out;
3412: }
3413: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3414: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3415: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3416: goto out;
3417: break;
3418: case KEY_ECDSA_CERT:
1.14 djm 3419: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3420: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3421: goto out;
1.84 djm 3422: if (k->type != type ||
3423: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
3424: r = SSH_ERR_INVALID_FORMAT;
3425: goto out;
3426: }
1.1 djm 3427: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3428: r = SSH_ERR_LIBCRYPTO_ERROR;
3429: goto out;
3430: }
3431: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3432: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3433: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3434: goto out;
3435: break;
1.85 djm 3436: case KEY_ECDSA_SK:
3437: if ((k = sshkey_new(type)) == NULL) {
3438: r = SSH_ERR_ALLOC_FAIL;
3439: goto out;
3440: }
3441: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3442: r = SSH_ERR_INVALID_ARGUMENT;
3443: goto out;
3444: }
3445: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3446: goto out;
3447: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3448: r = SSH_ERR_EC_CURVE_MISMATCH;
3449: goto out;
3450: }
3451: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3452: (k->sk_reserved = sshbuf_new()) == NULL) {
3453: r = SSH_ERR_ALLOC_FAIL;
3454: goto out;
3455: }
3456: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3457: if (k->ecdsa == NULL) {
3458: r = SSH_ERR_LIBCRYPTO_ERROR;
3459: goto out;
3460: }
3461: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3462: (r = sshbuf_get_cstring(buf, &k->sk_application,
3463: NULL)) != 0 ||
3464: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3465: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3466: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3467: goto out;
3468: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3469: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3470: goto out;
3471: break;
3472: case KEY_ECDSA_SK_CERT:
3473: if ((r = sshkey_froms(buf, &k)) != 0)
3474: goto out;
3475: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3476: (k->sk_reserved = sshbuf_new()) == NULL) {
3477: r = SSH_ERR_ALLOC_FAIL;
3478: goto out;
3479: }
3480: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3481: NULL)) != 0 ||
3482: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3483: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3484: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3485: goto out;
3486: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3487: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3488: goto out;
3489: break;
1.1 djm 3490: case KEY_RSA:
1.70 djm 3491: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3492: r = SSH_ERR_ALLOC_FAIL;
3493: goto out;
3494: }
1.73 djm 3495: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3496: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3497: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3498: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3499: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3500: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3501: goto out;
1.69 djm 3502: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3503: r = SSH_ERR_LIBCRYPTO_ERROR;
3504: goto out;
3505: }
3506: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3507: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3508: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3509: goto out;
3510: }
1.69 djm 3511: rsa_p = rsa_q = NULL; /* transferred */
3512: if ((r = check_rsa_length(k->rsa)) != 0)
3513: goto out;
3514: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3515: goto out;
1.1 djm 3516: break;
3517: case KEY_RSA_CERT:
1.14 djm 3518: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3519: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3520: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3521: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3522: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3523: goto out;
1.84 djm 3524: if (k->type != type) {
3525: r = SSH_ERR_INVALID_FORMAT;
3526: goto out;
3527: }
1.69 djm 3528: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3529: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3530: goto out;
3531: }
1.69 djm 3532: rsa_d = NULL; /* transferred */
3533: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3534: r = SSH_ERR_LIBCRYPTO_ERROR;
3535: goto out;
3536: }
3537: rsa_p = rsa_q = NULL; /* transferred */
3538: if ((r = check_rsa_length(k->rsa)) != 0)
3539: goto out;
3540: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3541: goto out;
1.1 djm 3542: break;
3543: #endif /* WITH_OPENSSL */
3544: case KEY_ED25519:
1.70 djm 3545: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3546: r = SSH_ERR_ALLOC_FAIL;
3547: goto out;
3548: }
3549: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3550: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3551: goto out;
3552: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3553: r = SSH_ERR_INVALID_FORMAT;
3554: goto out;
3555: }
3556: k->ed25519_pk = ed25519_pk;
3557: k->ed25519_sk = ed25519_sk;
3558: ed25519_pk = ed25519_sk = NULL;
3559: break;
3560: case KEY_ED25519_CERT:
1.14 djm 3561: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3562: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3563: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3564: goto out;
1.84 djm 3565: if (k->type != type) {
3566: r = SSH_ERR_INVALID_FORMAT;
3567: goto out;
3568: }
1.1 djm 3569: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3570: r = SSH_ERR_INVALID_FORMAT;
3571: goto out;
3572: }
3573: k->ed25519_pk = ed25519_pk;
3574: k->ed25519_sk = ed25519_sk;
1.84 djm 3575: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3576: break;
1.90 markus 3577: case KEY_ED25519_SK:
3578: if ((k = sshkey_new(type)) == NULL) {
3579: r = SSH_ERR_ALLOC_FAIL;
3580: goto out;
3581: }
3582: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3583: goto out;
3584: if (pklen != ED25519_PK_SZ) {
3585: r = SSH_ERR_INVALID_FORMAT;
3586: goto out;
3587: }
3588: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3589: (k->sk_reserved = sshbuf_new()) == NULL) {
3590: r = SSH_ERR_ALLOC_FAIL;
3591: goto out;
3592: }
3593: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3594: NULL)) != 0 ||
3595: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3596: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3597: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3598: goto out;
3599: k->ed25519_pk = ed25519_pk;
3600: ed25519_pk = NULL;
3601: break;
3602: case KEY_ED25519_SK_CERT:
3603: if ((r = sshkey_froms(buf, &k)) != 0 ||
3604: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3605: goto out;
3606: if (k->type != type) {
3607: r = SSH_ERR_INVALID_FORMAT;
3608: goto out;
3609: }
3610: if (pklen != ED25519_PK_SZ) {
3611: r = SSH_ERR_INVALID_FORMAT;
3612: goto out;
3613: }
3614: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3615: (k->sk_reserved = sshbuf_new()) == NULL) {
3616: r = SSH_ERR_ALLOC_FAIL;
3617: goto out;
3618: }
3619: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3620: NULL)) != 0 ||
3621: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3622: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3623: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3624: goto out;
3625: k->ed25519_pk = ed25519_pk;
3626: ed25519_pk = NULL; /* transferred */
3627: break;
1.62 markus 3628: #ifdef WITH_XMSS
3629: case KEY_XMSS:
1.70 djm 3630: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3631: r = SSH_ERR_ALLOC_FAIL;
3632: goto out;
3633: }
3634: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3635: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3636: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3637: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3638: goto out;
3639: if (pklen != sshkey_xmss_pklen(k) ||
3640: sklen != sshkey_xmss_sklen(k)) {
3641: r = SSH_ERR_INVALID_FORMAT;
3642: goto out;
3643: }
3644: k->xmss_pk = xmss_pk;
3645: k->xmss_sk = xmss_sk;
3646: xmss_pk = xmss_sk = NULL;
3647: /* optional internal state */
3648: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3649: goto out;
3650: break;
3651: case KEY_XMSS_CERT:
3652: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3653: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3654: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3655: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3656: goto out;
1.84 djm 3657: if (k->type != type || strcmp(xmss_name, k->xmss_name) != 0) {
1.64 markus 3658: r = SSH_ERR_INVALID_FORMAT;
3659: goto out;
3660: }
1.62 markus 3661: if (pklen != sshkey_xmss_pklen(k) ||
3662: sklen != sshkey_xmss_sklen(k)) {
3663: r = SSH_ERR_INVALID_FORMAT;
3664: goto out;
3665: }
3666: k->xmss_pk = xmss_pk;
3667: k->xmss_sk = xmss_sk;
3668: xmss_pk = xmss_sk = NULL;
3669: /* optional internal state */
3670: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3671: goto out;
3672: break;
3673: #endif /* WITH_XMSS */
1.1 djm 3674: default:
3675: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3676: goto out;
3677: }
3678: #ifdef WITH_OPENSSL
3679: /* enable blinding */
3680: switch (k->type) {
3681: case KEY_RSA:
3682: case KEY_RSA_CERT:
3683: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3684: r = SSH_ERR_LIBCRYPTO_ERROR;
3685: goto out;
3686: }
3687: break;
3688: }
3689: #endif /* WITH_OPENSSL */
3690: /* success */
3691: r = 0;
3692: if (kp != NULL) {
3693: *kp = k;
3694: k = NULL;
3695: }
3696: out:
3697: free(tname);
3698: free(curve);
3699: #ifdef WITH_OPENSSL
1.60 jsing 3700: BN_clear_free(exponent);
1.69 djm 3701: BN_clear_free(dsa_p);
3702: BN_clear_free(dsa_q);
3703: BN_clear_free(dsa_g);
3704: BN_clear_free(dsa_pub_key);
3705: BN_clear_free(dsa_priv_key);
3706: BN_clear_free(rsa_n);
3707: BN_clear_free(rsa_e);
3708: BN_clear_free(rsa_d);
3709: BN_clear_free(rsa_p);
3710: BN_clear_free(rsa_q);
3711: BN_clear_free(rsa_iqmp);
1.1 djm 3712: #endif /* WITH_OPENSSL */
3713: sshkey_free(k);
1.61 jsing 3714: freezero(ed25519_pk, pklen);
3715: freezero(ed25519_sk, sklen);
1.62 markus 3716: free(xmss_name);
3717: freezero(xmss_pk, pklen);
3718: freezero(xmss_sk, sklen);
1.1 djm 3719: return r;
3720: }
3721:
3722: #ifdef WITH_OPENSSL
3723: int
3724: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3725: {
3726: EC_POINT *nq = NULL;
1.93 djm 3727: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 3728: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3729:
3730: /*
3731: * NB. This assumes OpenSSL has already verified that the public
3732: * point lies on the curve. This is done by EC_POINT_oct2point()
3733: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3734: * reachable with public points not unmarshalled using
3735: * EC_POINT_oct2point then the caller will need to explicitly check.
3736: */
1.1 djm 3737:
3738: /*
3739: * We shouldn't ever hit this case because bignum_get_ecpoint()
3740: * refuses to load GF2m points.
3741: */
3742: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3743: NID_X9_62_prime_field)
3744: goto out;
3745:
3746: /* Q != infinity */
3747: if (EC_POINT_is_at_infinity(group, public))
3748: goto out;
3749:
1.93 djm 3750: if ((x = BN_new()) == NULL ||
3751: (y = BN_new()) == NULL ||
3752: (order = BN_new()) == NULL ||
3753: (tmp = BN_new()) == NULL) {
1.1 djm 3754: ret = SSH_ERR_ALLOC_FAIL;
3755: goto out;
3756: }
3757:
3758: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 3759: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 3760: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 3761: x, y, NULL) != 1) {
1.1 djm 3762: ret = SSH_ERR_LIBCRYPTO_ERROR;
3763: goto out;
3764: }
3765: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3766: BN_num_bits(y) <= BN_num_bits(order) / 2)
3767: goto out;
3768:
3769: /* nQ == infinity (n == order of subgroup) */
3770: if ((nq = EC_POINT_new(group)) == NULL) {
3771: ret = SSH_ERR_ALLOC_FAIL;
3772: goto out;
3773: }
1.93 djm 3774: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 3775: ret = SSH_ERR_LIBCRYPTO_ERROR;
3776: goto out;
3777: }
3778: if (EC_POINT_is_at_infinity(group, nq) != 1)
3779: goto out;
3780:
3781: /* x < order - 1, y < order - 1 */
3782: if (!BN_sub(tmp, order, BN_value_one())) {
3783: ret = SSH_ERR_LIBCRYPTO_ERROR;
3784: goto out;
3785: }
3786: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3787: goto out;
3788: ret = 0;
3789: out:
1.93 djm 3790: BN_clear_free(x);
3791: BN_clear_free(y);
3792: BN_clear_free(order);
3793: BN_clear_free(tmp);
1.60 jsing 3794: EC_POINT_free(nq);
1.1 djm 3795: return ret;
3796: }
3797:
3798: int
3799: sshkey_ec_validate_private(const EC_KEY *key)
3800: {
1.93 djm 3801: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3802: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3803:
1.93 djm 3804: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3805: ret = SSH_ERR_ALLOC_FAIL;
3806: goto out;
3807: }
3808:
3809: /* log2(private) > log2(order)/2 */
1.93 djm 3810: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3811: ret = SSH_ERR_LIBCRYPTO_ERROR;
3812: goto out;
3813: }
3814: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3815: BN_num_bits(order) / 2)
3816: goto out;
3817:
3818: /* private < order - 1 */
3819: if (!BN_sub(tmp, order, BN_value_one())) {
3820: ret = SSH_ERR_LIBCRYPTO_ERROR;
3821: goto out;
3822: }
3823: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3824: goto out;
3825: ret = 0;
3826: out:
1.93 djm 3827: BN_clear_free(order);
3828: BN_clear_free(tmp);
1.1 djm 3829: return ret;
3830: }
3831:
3832: void
3833: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3834: {
1.93 djm 3835: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3836:
3837: if (point == NULL) {
3838: fputs("point=(NULL)\n", stderr);
3839: return;
3840: }
1.93 djm 3841: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3842: fprintf(stderr, "%s: BN_new failed\n", __func__);
3843: goto out;
1.1 djm 3844: }
3845: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3846: NID_X9_62_prime_field) {
3847: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3848: goto out;
1.1 djm 3849: }
1.93 djm 3850: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3851: x, y, NULL) != 1) {
1.1 djm 3852: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3853: __func__);
1.93 djm 3854: goto out;
1.1 djm 3855: }
3856: fputs("x=", stderr);
3857: BN_print_fp(stderr, x);
3858: fputs("\ny=", stderr);
3859: BN_print_fp(stderr, y);
3860: fputs("\n", stderr);
1.93 djm 3861: out:
3862: BN_clear_free(x);
3863: BN_clear_free(y);
1.1 djm 3864: }
3865:
3866: void
3867: sshkey_dump_ec_key(const EC_KEY *key)
3868: {
3869: const BIGNUM *exponent;
3870:
3871: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3872: EC_KEY_get0_public_key(key));
3873: fputs("exponent=", stderr);
3874: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3875: fputs("(NULL)", stderr);
3876: else
3877: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3878: fputs("\n", stderr);
3879: }
3880: #endif /* WITH_OPENSSL */
3881:
3882: static int
1.76 djm 3883: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3884: const char *passphrase, const char *comment, const char *ciphername,
3885: int rounds)
3886: {
1.4 djm 3887: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3888: u_char salt[SALT_LEN];
1.4 djm 3889: char *b64 = NULL;
1.1 djm 3890: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3891: u_int check;
3892: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3893: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3894: const struct sshcipher *cipher;
3895: const char *kdfname = KDFNAME;
3896: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3897:
3898: if (rounds <= 0)
3899: rounds = DEFAULT_ROUNDS;
3900: if (passphrase == NULL || !strlen(passphrase)) {
3901: ciphername = "none";
3902: kdfname = "none";
3903: } else if (ciphername == NULL)
3904: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3905: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3906: r = SSH_ERR_INVALID_ARGUMENT;
3907: goto out;
3908: }
3909:
3910: if ((kdf = sshbuf_new()) == NULL ||
3911: (encoded = sshbuf_new()) == NULL ||
3912: (encrypted = sshbuf_new()) == NULL) {
3913: r = SSH_ERR_ALLOC_FAIL;
3914: goto out;
3915: }
3916: blocksize = cipher_blocksize(cipher);
3917: keylen = cipher_keylen(cipher);
3918: ivlen = cipher_ivlen(cipher);
3919: authlen = cipher_authlen(cipher);
3920: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3921: r = SSH_ERR_ALLOC_FAIL;
3922: goto out;
3923: }
3924: if (strcmp(kdfname, "bcrypt") == 0) {
3925: arc4random_buf(salt, SALT_LEN);
3926: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3927: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3928: r = SSH_ERR_INVALID_ARGUMENT;
3929: goto out;
3930: }
3931: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3932: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3933: goto out;
3934: } else if (strcmp(kdfname, "none") != 0) {
3935: /* Unsupported KDF type */
3936: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3937: goto out;
3938: }
3939: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3940: key + keylen, ivlen, 1)) != 0)
3941: goto out;
3942:
3943: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3944: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3945: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3946: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3947: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3948: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3949: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3950: goto out;
3951:
3952: /* set up the buffer that will be encrypted */
3953:
3954: /* Random check bytes */
3955: check = arc4random();
3956: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3957: (r = sshbuf_put_u32(encrypted, check)) != 0)
3958: goto out;
3959:
3960: /* append private key and comment*/
1.62 markus 3961: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3962: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3963: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3964: goto out;
3965:
3966: /* padding */
3967: i = 0;
3968: while (sshbuf_len(encrypted) % blocksize) {
3969: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3970: goto out;
3971: }
3972:
3973: /* length in destination buffer */
3974: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3975: goto out;
3976:
3977: /* encrypt */
3978: if ((r = sshbuf_reserve(encoded,
3979: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3980: goto out;
1.36 djm 3981: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3982: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3983: goto out;
3984:
1.81 djm 3985: sshbuf_reset(blob);
1.1 djm 3986:
1.81 djm 3987: /* assemble uuencoded key */
3988: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3989: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3990: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3991: goto out;
3992:
3993: /* success */
3994: r = 0;
3995:
3996: out:
3997: sshbuf_free(kdf);
3998: sshbuf_free(encoded);
3999: sshbuf_free(encrypted);
1.36 djm 4000: cipher_free(ciphercontext);
1.1 djm 4001: explicit_bzero(salt, sizeof(salt));
4002: if (key != NULL) {
4003: explicit_bzero(key, keylen + ivlen);
4004: free(key);
4005: }
4006: if (pubkeyblob != NULL) {
4007: explicit_bzero(pubkeyblob, pubkeylen);
4008: free(pubkeyblob);
4009: }
4010: if (b64 != NULL) {
4011: explicit_bzero(b64, strlen(b64));
4012: free(b64);
4013: }
4014: return r;
4015: }
4016:
4017: static int
4018: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
4019: struct sshkey **keyp, char **commentp)
4020: {
4021: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
4022: const struct sshcipher *cipher = NULL;
4023: const u_char *cp;
4024: int r = SSH_ERR_INTERNAL_ERROR;
4025: size_t encoded_len;
1.18 djm 4026: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 4027: struct sshbuf *encoded = NULL, *decoded = NULL;
4028: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 4029: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 4030: struct sshkey *k = NULL;
4031: u_char *key = NULL, *salt = NULL, *dp, pad, last;
4032: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
4033:
4034: if (keyp != NULL)
4035: *keyp = NULL;
4036: if (commentp != NULL)
4037: *commentp = NULL;
4038:
4039: if ((encoded = sshbuf_new()) == NULL ||
4040: (decoded = sshbuf_new()) == NULL ||
4041: (decrypted = sshbuf_new()) == NULL) {
4042: r = SSH_ERR_ALLOC_FAIL;
4043: goto out;
4044: }
4045:
4046: /* check preamble */
4047: cp = sshbuf_ptr(blob);
4048: encoded_len = sshbuf_len(blob);
4049: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
4050: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
4051: r = SSH_ERR_INVALID_FORMAT;
4052: goto out;
4053: }
4054: cp += MARK_BEGIN_LEN;
4055: encoded_len -= MARK_BEGIN_LEN;
4056:
4057: /* Look for end marker, removing whitespace as we go */
4058: while (encoded_len > 0) {
4059: if (*cp != '\n' && *cp != '\r') {
4060: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
4061: goto out;
4062: }
4063: last = *cp;
4064: encoded_len--;
4065: cp++;
4066: if (last == '\n') {
4067: if (encoded_len >= MARK_END_LEN &&
4068: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
4069: /* \0 terminate */
4070: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
4071: goto out;
4072: break;
4073: }
4074: }
4075: }
4076: if (encoded_len == 0) {
4077: r = SSH_ERR_INVALID_FORMAT;
4078: goto out;
4079: }
4080:
4081: /* decode base64 */
1.4 djm 4082: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 4083: goto out;
4084:
4085: /* check magic */
4086: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
4087: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
4088: r = SSH_ERR_INVALID_FORMAT;
4089: goto out;
4090: }
4091: /* parse public portion of key */
4092: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
4093: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
4094: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
4095: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
4096: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
4097: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
4098: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
4099: goto out;
4100:
4101: if ((cipher = cipher_by_name(ciphername)) == NULL) {
4102: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4103: goto out;
4104: }
4105: if ((passphrase == NULL || strlen(passphrase) == 0) &&
4106: strcmp(ciphername, "none") != 0) {
4107: /* passphrase required */
4108: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4109: goto out;
4110: }
4111: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
4112: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4113: goto out;
4114: }
4115: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
4116: r = SSH_ERR_INVALID_FORMAT;
4117: goto out;
4118: }
4119: if (nkeys != 1) {
4120: /* XXX only one key supported */
4121: r = SSH_ERR_INVALID_FORMAT;
4122: goto out;
4123: }
4124:
4125: /* check size of encrypted key blob */
4126: blocksize = cipher_blocksize(cipher);
4127: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
4128: r = SSH_ERR_INVALID_FORMAT;
4129: goto out;
4130: }
4131:
4132: /* setup key */
4133: keylen = cipher_keylen(cipher);
4134: ivlen = cipher_ivlen(cipher);
1.18 djm 4135: authlen = cipher_authlen(cipher);
1.1 djm 4136: if ((key = calloc(1, keylen + ivlen)) == NULL) {
4137: r = SSH_ERR_ALLOC_FAIL;
4138: goto out;
4139: }
4140: if (strcmp(kdfname, "bcrypt") == 0) {
4141: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4142: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4143: goto out;
4144: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4145: key, keylen + ivlen, rounds) < 0) {
4146: r = SSH_ERR_INVALID_FORMAT;
4147: goto out;
4148: }
4149: }
4150:
1.18 djm 4151: /* check that an appropriate amount of auth data is present */
1.84 djm 4152: if (sshbuf_len(decoded) < authlen ||
4153: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4154: r = SSH_ERR_INVALID_FORMAT;
4155: goto out;
4156: }
4157:
1.1 djm 4158: /* decrypt private portion of key */
4159: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4160: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4161: key + keylen, ivlen, 0)) != 0)
4162: goto out;
1.36 djm 4163: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4164: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4165: /* an integrity error here indicates an incorrect passphrase */
4166: if (r == SSH_ERR_MAC_INVALID)
4167: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4168: goto out;
4169: }
1.18 djm 4170: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4171: goto out;
4172: /* there should be no trailing data */
4173: if (sshbuf_len(decoded) != 0) {
4174: r = SSH_ERR_INVALID_FORMAT;
4175: goto out;
4176: }
4177:
4178: /* check check bytes */
4179: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4180: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4181: goto out;
4182: if (check1 != check2) {
4183: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4184: goto out;
4185: }
4186:
4187: /* Load the private key and comment */
4188: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4189: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4190: goto out;
4191:
4192: /* Check deterministic padding */
4193: i = 0;
4194: while (sshbuf_len(decrypted)) {
4195: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
4196: goto out;
4197: if (pad != (++i & 0xff)) {
4198: r = SSH_ERR_INVALID_FORMAT;
4199: goto out;
4200: }
4201: }
4202:
4203: /* XXX decode pubkey and check against private */
4204:
4205: /* success */
4206: r = 0;
4207: if (keyp != NULL) {
4208: *keyp = k;
4209: k = NULL;
4210: }
4211: if (commentp != NULL) {
4212: *commentp = comment;
4213: comment = NULL;
4214: }
4215: out:
4216: pad = 0;
1.36 djm 4217: cipher_free(ciphercontext);
1.1 djm 4218: free(ciphername);
4219: free(kdfname);
4220: free(comment);
4221: if (salt != NULL) {
4222: explicit_bzero(salt, slen);
4223: free(salt);
4224: }
4225: if (key != NULL) {
4226: explicit_bzero(key, keylen + ivlen);
4227: free(key);
4228: }
4229: sshbuf_free(encoded);
4230: sshbuf_free(decoded);
4231: sshbuf_free(kdf);
4232: sshbuf_free(decrypted);
4233: sshkey_free(k);
4234: return r;
4235: }
4236:
4237:
4238: #ifdef WITH_OPENSSL
1.80 djm 4239: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4240: static int
1.80 djm 4241: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4242: int format, const char *_passphrase, const char *comment)
1.1 djm 4243: {
1.76 djm 4244: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4245: int success, r;
4246: int blen, len = strlen(_passphrase);
4247: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4248: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4249: char *bptr;
1.1 djm 4250: BIO *bio = NULL;
1.76 djm 4251: struct sshbuf *blob;
1.80 djm 4252: EVP_PKEY *pkey = NULL;
1.1 djm 4253:
4254: if (len > 0 && len <= 4)
4255: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4256: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4257: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4258: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4259: r = SSH_ERR_ALLOC_FAIL;
4260: goto out;
4261: }
4262: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4263: r = SSH_ERR_ALLOC_FAIL;
4264: goto out;
1.76 djm 4265: }
4266: if ((r = sshkey_unshield_private(key)) != 0)
4267: goto out;
1.1 djm 4268:
4269: switch (key->type) {
4270: case KEY_DSA:
1.80 djm 4271: if (format == SSHKEY_PRIVATE_PEM) {
4272: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4273: cipher, passphrase, len, NULL, NULL);
4274: } else {
4275: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4276: }
1.1 djm 4277: break;
4278: case KEY_ECDSA:
1.80 djm 4279: if (format == SSHKEY_PRIVATE_PEM) {
4280: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4281: cipher, passphrase, len, NULL, NULL);
4282: } else {
4283: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4284: }
1.1 djm 4285: break;
4286: case KEY_RSA:
1.80 djm 4287: if (format == SSHKEY_PRIVATE_PEM) {
4288: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4289: cipher, passphrase, len, NULL, NULL);
4290: } else {
4291: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4292: }
1.1 djm 4293: break;
4294: default:
4295: success = 0;
4296: break;
4297: }
4298: if (success == 0) {
4299: r = SSH_ERR_LIBCRYPTO_ERROR;
4300: goto out;
4301: }
1.80 djm 4302: if (format == SSHKEY_PRIVATE_PKCS8) {
4303: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4304: passphrase, len, NULL, NULL)) == 0) {
4305: r = SSH_ERR_LIBCRYPTO_ERROR;
4306: goto out;
4307: }
4308: }
1.1 djm 4309: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4310: r = SSH_ERR_INTERNAL_ERROR;
4311: goto out;
4312: }
4313: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4314: goto out;
4315: r = 0;
4316: out:
1.76 djm 4317: if (was_shielded)
4318: r = sshkey_shield_private(key);
4319: if (r == 0)
4320: r = sshbuf_putb(buf, blob);
1.80 djm 4321:
4322: EVP_PKEY_free(pkey);
1.76 djm 4323: sshbuf_free(blob);
1.1 djm 4324: BIO_free(bio);
4325: return r;
4326: }
4327: #endif /* WITH_OPENSSL */
4328:
4329: /* Serialise "key" to buffer "blob" */
4330: int
4331: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4332: const char *passphrase, const char *comment,
1.80 djm 4333: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4334: {
4335: switch (key->type) {
1.9 markus 4336: #ifdef WITH_OPENSSL
1.1 djm 4337: case KEY_DSA:
4338: case KEY_ECDSA:
4339: case KEY_RSA:
1.80 djm 4340: break; /* see below */
1.1 djm 4341: #endif /* WITH_OPENSSL */
4342: case KEY_ED25519:
1.90 markus 4343: case KEY_ED25519_SK:
1.62 markus 4344: #ifdef WITH_XMSS
4345: case KEY_XMSS:
4346: #endif /* WITH_XMSS */
1.85 djm 4347: #ifdef WITH_OPENSSL
4348: case KEY_ECDSA_SK:
4349: #endif /* WITH_OPENSSL */
1.1 djm 4350: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4351: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4352: default:
4353: return SSH_ERR_KEY_TYPE_UNKNOWN;
4354: }
1.80 djm 4355:
4356: #ifdef WITH_OPENSSL
4357: switch (format) {
4358: case SSHKEY_PRIVATE_OPENSSH:
4359: return sshkey_private_to_blob2(key, blob, passphrase,
4360: comment, openssh_format_cipher, openssh_format_rounds);
4361: case SSHKEY_PRIVATE_PEM:
4362: case SSHKEY_PRIVATE_PKCS8:
4363: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4364: format, passphrase, comment);
4365: default:
4366: return SSH_ERR_INVALID_ARGUMENT;
4367: }
4368: #endif /* WITH_OPENSSL */
1.1 djm 4369: }
4370:
4371: #ifdef WITH_OPENSSL
1.8 djm 4372: static int
1.52 djm 4373: translate_libcrypto_error(unsigned long pem_err)
4374: {
4375: int pem_reason = ERR_GET_REASON(pem_err);
4376:
4377: switch (ERR_GET_LIB(pem_err)) {
4378: case ERR_LIB_PEM:
4379: switch (pem_reason) {
4380: case PEM_R_BAD_PASSWORD_READ:
4381: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4382: case PEM_R_BAD_DECRYPT:
4383: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4384: default:
4385: return SSH_ERR_INVALID_FORMAT;
4386: }
4387: case ERR_LIB_EVP:
4388: switch (pem_reason) {
4389: case EVP_R_BAD_DECRYPT:
4390: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4391: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4392: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4393: #endif
1.52 djm 4394: case EVP_R_DECODE_ERROR:
4395: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4396: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4397: #endif
4398: return SSH_ERR_INVALID_FORMAT;
4399: default:
4400: return SSH_ERR_LIBCRYPTO_ERROR;
4401: }
4402: case ERR_LIB_ASN1:
4403: return SSH_ERR_INVALID_FORMAT;
4404: }
4405: return SSH_ERR_LIBCRYPTO_ERROR;
4406: }
4407:
4408: static void
4409: clear_libcrypto_errors(void)
4410: {
4411: while (ERR_get_error() != 0)
4412: ;
4413: }
4414:
4415: /*
4416: * Translate OpenSSL error codes to determine whether
4417: * passphrase is required/incorrect.
4418: */
4419: static int
4420: convert_libcrypto_error(void)
4421: {
4422: /*
4423: * Some password errors are reported at the beginning
4424: * of the error queue.
4425: */
4426: if (translate_libcrypto_error(ERR_peek_error()) ==
4427: SSH_ERR_KEY_WRONG_PASSPHRASE)
4428: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4429: return translate_libcrypto_error(ERR_peek_last_error());
4430: }
4431:
4432: static int
1.1 djm 4433: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4434: const char *passphrase, struct sshkey **keyp)
1.1 djm 4435: {
4436: EVP_PKEY *pk = NULL;
4437: struct sshkey *prv = NULL;
4438: BIO *bio = NULL;
4439: int r;
4440:
1.32 djm 4441: if (keyp != NULL)
4442: *keyp = NULL;
1.1 djm 4443:
4444: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4445: return SSH_ERR_ALLOC_FAIL;
4446: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4447: (int)sshbuf_len(blob)) {
4448: r = SSH_ERR_ALLOC_FAIL;
4449: goto out;
4450: }
4451:
1.52 djm 4452: clear_libcrypto_errors();
1.1 djm 4453: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4454: (char *)passphrase)) == NULL) {
1.71 djm 4455: /*
4456: * libcrypto may return various ASN.1 errors when attempting
4457: * to parse a key with an incorrect passphrase.
4458: * Treat all format errors as "incorrect passphrase" if a
4459: * passphrase was supplied.
4460: */
4461: if (passphrase != NULL && *passphrase != '\0')
4462: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4463: else
4464: r = convert_libcrypto_error();
1.1 djm 4465: goto out;
4466: }
1.69 djm 4467: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4468: (type == KEY_UNSPEC || type == KEY_RSA)) {
4469: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4470: r = SSH_ERR_ALLOC_FAIL;
4471: goto out;
4472: }
4473: prv->rsa = EVP_PKEY_get1_RSA(pk);
4474: prv->type = KEY_RSA;
4475: #ifdef DEBUG_PK
4476: RSA_print_fp(stderr, prv->rsa, 8);
4477: #endif
4478: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4479: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4480: goto out;
4481: }
1.69 djm 4482: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4483: goto out;
1.69 djm 4484: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4485: (type == KEY_UNSPEC || type == KEY_DSA)) {
4486: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4487: r = SSH_ERR_ALLOC_FAIL;
4488: goto out;
4489: }
4490: prv->dsa = EVP_PKEY_get1_DSA(pk);
4491: prv->type = KEY_DSA;
4492: #ifdef DEBUG_PK
4493: DSA_print_fp(stderr, prv->dsa, 8);
4494: #endif
1.69 djm 4495: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4496: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4497: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4498: r = SSH_ERR_ALLOC_FAIL;
4499: goto out;
4500: }
4501: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4502: prv->type = KEY_ECDSA;
4503: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4504: if (prv->ecdsa_nid == -1 ||
4505: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4506: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4507: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4508: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4509: r = SSH_ERR_INVALID_FORMAT;
4510: goto out;
4511: }
4512: #ifdef DEBUG_PK
4513: if (prv != NULL && prv->ecdsa != NULL)
4514: sshkey_dump_ec_key(prv->ecdsa);
4515: #endif
4516: } else {
4517: r = SSH_ERR_INVALID_FORMAT;
4518: goto out;
4519: }
4520: r = 0;
1.32 djm 4521: if (keyp != NULL) {
4522: *keyp = prv;
4523: prv = NULL;
4524: }
1.1 djm 4525: out:
4526: BIO_free(bio);
1.60 jsing 4527: EVP_PKEY_free(pk);
1.30 mmcc 4528: sshkey_free(prv);
1.1 djm 4529: return r;
4530: }
4531: #endif /* WITH_OPENSSL */
4532:
4533: int
4534: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4535: const char *passphrase, struct sshkey **keyp, char **commentp)
4536: {
1.42 djm 4537: int r = SSH_ERR_INTERNAL_ERROR;
4538:
1.32 djm 4539: if (keyp != NULL)
4540: *keyp = NULL;
1.1 djm 4541: if (commentp != NULL)
4542: *commentp = NULL;
4543:
4544: switch (type) {
1.9 markus 4545: #ifdef WITH_OPENSSL
1.1 djm 4546: case KEY_DSA:
4547: case KEY_ECDSA:
4548: case KEY_RSA:
1.8 djm 4549: return sshkey_parse_private_pem_fileblob(blob, type,
4550: passphrase, keyp);
1.1 djm 4551: #endif /* WITH_OPENSSL */
4552: case KEY_ED25519:
1.62 markus 4553: #ifdef WITH_XMSS
4554: case KEY_XMSS:
4555: #endif /* WITH_XMSS */
1.1 djm 4556: return sshkey_parse_private2(blob, type, passphrase,
4557: keyp, commentp);
4558: case KEY_UNSPEC:
1.42 djm 4559: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4560: commentp);
4561: /* Do not fallback to PEM parser if only passphrase is wrong. */
4562: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4563: return r;
1.1 djm 4564: #ifdef WITH_OPENSSL
1.8 djm 4565: return sshkey_parse_private_pem_fileblob(blob, type,
4566: passphrase, keyp);
1.1 djm 4567: #else
4568: return SSH_ERR_INVALID_FORMAT;
4569: #endif /* WITH_OPENSSL */
4570: default:
4571: return SSH_ERR_KEY_TYPE_UNKNOWN;
4572: }
4573: }
4574:
4575: int
4576: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4577: struct sshkey **keyp, char **commentp)
1.1 djm 4578: {
4579: if (keyp != NULL)
4580: *keyp = NULL;
4581: if (commentp != NULL)
4582: *commentp = NULL;
4583:
1.23 tim 4584: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4585: passphrase, keyp, commentp);
1.96 ! djm 4586: }
! 4587:
! 4588: void
! 4589: sshkey_sig_details_free(struct sshkey_sig_details *details)
! 4590: {
! 4591: freezero(details, sizeof(*details));
1.1 djm 4592: }
1.62 markus 4593:
4594: #ifdef WITH_XMSS
4595: /*
4596: * serialize the key with the current state and forward the state
4597: * maxsign times.
4598: */
4599: int
1.77 djm 4600: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4601: u_int32_t maxsign, sshkey_printfn *pr)
4602: {
4603: int r, rupdate;
4604:
4605: if (maxsign == 0 ||
4606: sshkey_type_plain(k->type) != KEY_XMSS)
4607: return sshkey_private_serialize_opt(k, b,
4608: SSHKEY_SERIALIZE_DEFAULT);
4609: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4610: (r = sshkey_private_serialize_opt(k, b,
4611: SSHKEY_SERIALIZE_STATE)) != 0 ||
4612: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4613: goto out;
4614: r = 0;
4615: out:
4616: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4617: if (r == 0)
4618: r = rupdate;
4619: }
4620: return r;
4621: }
4622:
4623: u_int32_t
4624: sshkey_signatures_left(const struct sshkey *k)
4625: {
4626: if (sshkey_type_plain(k->type) == KEY_XMSS)
4627: return sshkey_xmss_signatures_left(k);
4628: return 0;
4629: }
4630:
4631: int
4632: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4633: {
4634: if (sshkey_type_plain(k->type) != KEY_XMSS)
4635: return SSH_ERR_INVALID_ARGUMENT;
4636: return sshkey_xmss_enable_maxsign(k, maxsign);
4637: }
4638:
4639: int
4640: sshkey_set_filename(struct sshkey *k, const char *filename)
4641: {
4642: if (k == NULL)
4643: return SSH_ERR_INVALID_ARGUMENT;
4644: if (sshkey_type_plain(k->type) != KEY_XMSS)
4645: return 0;
4646: if (filename == NULL)
4647: return SSH_ERR_INVALID_ARGUMENT;
4648: if ((k->xmss_filename = strdup(filename)) == NULL)
4649: return SSH_ERR_ALLOC_FAIL;
4650: return 0;
4651: }
4652: #else
4653: int
1.76 djm 4654: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4655: u_int32_t maxsign, sshkey_printfn *pr)
4656: {
4657: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4658: }
4659:
4660: u_int32_t
4661: sshkey_signatures_left(const struct sshkey *k)
4662: {
4663: return 0;
4664: }
4665:
4666: int
4667: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4668: {
4669: return SSH_ERR_INVALID_ARGUMENT;
4670: }
4671:
4672: int
4673: sshkey_set_filename(struct sshkey *k, const char *filename)
4674: {
4675: if (k == NULL)
4676: return SSH_ERR_INVALID_ARGUMENT;
4677: return 0;
4678: }
4679: #endif /* WITH_XMSS */
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