Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.94
1.94 ! djm 1: /* $OpenBSD: sshkey.c,v 1.93 2019/11/15 06:00:20 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:
1.62 markus 799: #ifdef WITH_XMSS
800: case KEY_XMSS_CERT:
801: #endif /* WITH_XMSS */
1.1 djm 802: /* Use the existing blob */
803: /* XXX modified flag? */
804: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
805: return ret;
806: break;
807: #ifdef WITH_OPENSSL
808: case KEY_DSA:
809: if (key->dsa == NULL)
810: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 811: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
812: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 813: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 814: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
815: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
816: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
817: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 818: return ret;
819: break;
820: case KEY_ECDSA:
1.85 djm 821: case KEY_ECDSA_SK:
1.1 djm 822: if (key->ecdsa == NULL)
823: return SSH_ERR_INVALID_ARGUMENT;
824: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
825: (ret = sshbuf_put_cstring(b,
826: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
827: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
828: return ret;
1.85 djm 829: if (type == KEY_ECDSA_SK) {
830: if ((ret = sshbuf_put_cstring(b,
831: key->sk_application)) != 0)
832: return ret;
833: }
1.1 djm 834: break;
835: case KEY_RSA:
836: if (key->rsa == NULL)
837: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 838: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 839: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 840: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
841: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 842: return ret;
843: break;
844: #endif /* WITH_OPENSSL */
845: case KEY_ED25519:
1.90 markus 846: case KEY_ED25519_SK:
1.1 djm 847: if (key->ed25519_pk == NULL)
848: return SSH_ERR_INVALID_ARGUMENT;
849: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
850: (ret = sshbuf_put_string(b,
851: key->ed25519_pk, ED25519_PK_SZ)) != 0)
852: return ret;
1.90 markus 853: if (type == KEY_ED25519_SK) {
854: if ((ret = sshbuf_put_cstring(b,
855: key->sk_application)) != 0)
856: return ret;
857: }
1.1 djm 858: break;
1.62 markus 859: #ifdef WITH_XMSS
860: case KEY_XMSS:
861: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
862: sshkey_xmss_pklen(key) == 0)
863: return SSH_ERR_INVALID_ARGUMENT;
864: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
865: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
866: (ret = sshbuf_put_string(b,
867: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
868: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
869: return ret;
870: break;
871: #endif /* WITH_XMSS */
1.1 djm 872: default:
873: return SSH_ERR_KEY_TYPE_UNKNOWN;
874: }
875: return 0;
876: }
877:
878: int
1.14 djm 879: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 880: {
1.62 markus 881: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 882: }
883:
884: int
1.62 markus 885: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
886: enum sshkey_serialize_rep opts)
1.14 djm 887: {
888: struct sshbuf *tmp;
889: int r;
890:
891: if ((tmp = sshbuf_new()) == NULL)
892: return SSH_ERR_ALLOC_FAIL;
1.62 markus 893: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 894: if (r == 0)
895: r = sshbuf_put_stringb(b, tmp);
896: sshbuf_free(tmp);
897: return r;
898: }
899:
900: int
1.62 markus 901: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
902: {
903: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
904: }
905:
906: int
1.14 djm 907: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 908: {
1.62 markus 909: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 910: }
911:
912: static int
1.62 markus 913: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
914: enum sshkey_serialize_rep opts)
1.1 djm 915: {
916: int ret = SSH_ERR_INTERNAL_ERROR;
917: size_t len;
918: struct sshbuf *b = NULL;
919:
920: if (lenp != NULL)
921: *lenp = 0;
922: if (blobp != NULL)
923: *blobp = NULL;
924: if ((b = sshbuf_new()) == NULL)
925: return SSH_ERR_ALLOC_FAIL;
1.62 markus 926: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 927: goto out;
928: len = sshbuf_len(b);
929: if (lenp != NULL)
930: *lenp = len;
931: if (blobp != NULL) {
932: if ((*blobp = malloc(len)) == NULL) {
933: ret = SSH_ERR_ALLOC_FAIL;
934: goto out;
935: }
936: memcpy(*blobp, sshbuf_ptr(b), len);
937: }
938: ret = 0;
939: out:
940: sshbuf_free(b);
941: return ret;
942: }
943:
944: int
945: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
946: {
1.62 markus 947: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 948: }
949:
950: int
951: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
952: {
1.62 markus 953: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 954: }
955:
956: int
1.7 djm 957: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 958: u_char **retp, size_t *lenp)
959: {
960: u_char *blob = NULL, *ret = NULL;
961: size_t blob_len = 0;
1.7 djm 962: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 963:
964: if (retp != NULL)
965: *retp = NULL;
966: if (lenp != NULL)
967: *lenp = 0;
1.7 djm 968: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 969: r = SSH_ERR_INVALID_ARGUMENT;
970: goto out;
971: }
1.62 markus 972: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
973: != 0)
1.1 djm 974: goto out;
975: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
976: r = SSH_ERR_ALLOC_FAIL;
977: goto out;
978: }
1.7 djm 979: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 980: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
981: goto out;
982: /* success */
983: if (retp != NULL) {
984: *retp = ret;
985: ret = NULL;
986: }
987: if (lenp != NULL)
1.7 djm 988: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 989: r = 0;
990: out:
991: free(ret);
992: if (blob != NULL) {
993: explicit_bzero(blob, blob_len);
994: free(blob);
995: }
996: return r;
997: }
998:
999: static char *
1.7 djm 1000: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1001: {
1002: char *ret;
1003: size_t plen = strlen(alg) + 1;
1004: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
1005:
1006: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
1007: return NULL;
1008: strlcpy(ret, alg, rlen);
1009: strlcat(ret, ":", rlen);
1010: if (dgst_raw_len == 0)
1011: return ret;
1.79 dtucker 1012: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 1013: freezero(ret, rlen);
1.7 djm 1014: return NULL;
1015: }
1016: /* Trim padding characters from end */
1017: ret[strcspn(ret, "=")] = '\0';
1018: return ret;
1019: }
1020:
1021: static char *
1022: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 1023: {
1.7 djm 1024: char *retval, hex[5];
1025: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 1026:
1.7 djm 1027: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 1028: return NULL;
1.7 djm 1029: strlcpy(retval, alg, rlen);
1030: strlcat(retval, ":", rlen);
1.1 djm 1031: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 1032: snprintf(hex, sizeof(hex), "%s%02x",
1033: i > 0 ? ":" : "", dgst_raw[i]);
1034: strlcat(retval, hex, rlen);
1.1 djm 1035: }
1036: return retval;
1037: }
1038:
1039: static char *
1040: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
1041: {
1042: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1043: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1044: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1045: u_int i, j = 0, rounds, seed = 1;
1046: char *retval;
1047:
1048: rounds = (dgst_raw_len / 2) + 1;
1049: if ((retval = calloc(rounds, 6)) == NULL)
1050: return NULL;
1051: retval[j++] = 'x';
1052: for (i = 0; i < rounds; i++) {
1053: u_int idx0, idx1, idx2, idx3, idx4;
1054: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1055: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1056: seed) % 6;
1057: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1058: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1059: (seed / 6)) % 6;
1060: retval[j++] = vowels[idx0];
1061: retval[j++] = consonants[idx1];
1062: retval[j++] = vowels[idx2];
1063: if ((i + 1) < rounds) {
1064: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1065: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1066: retval[j++] = consonants[idx3];
1067: retval[j++] = '-';
1068: retval[j++] = consonants[idx4];
1069: seed = ((seed * 5) +
1070: ((((u_int)(dgst_raw[2 * i])) * 7) +
1071: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1072: }
1073: } else {
1074: idx0 = seed % 6;
1075: idx1 = 16;
1076: idx2 = seed / 6;
1077: retval[j++] = vowels[idx0];
1078: retval[j++] = consonants[idx1];
1079: retval[j++] = vowels[idx2];
1080: }
1081: }
1082: retval[j++] = 'x';
1083: retval[j++] = '\0';
1084: return retval;
1085: }
1086:
1087: /*
1088: * Draw an ASCII-Art representing the fingerprint so human brain can
1089: * profit from its built-in pattern recognition ability.
1090: * This technique is called "random art" and can be found in some
1091: * scientific publications like this original paper:
1092: *
1093: * "Hash Visualization: a New Technique to improve Real-World Security",
1094: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1095: * Techniques and E-Commerce (CrypTEC '99)
1096: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1097: *
1098: * The subject came up in a talk by Dan Kaminsky, too.
1099: *
1100: * If you see the picture is different, the key is different.
1101: * If the picture looks the same, you still know nothing.
1102: *
1103: * The algorithm used here is a worm crawling over a discrete plane,
1104: * leaving a trace (augmenting the field) everywhere it goes.
1105: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1106: * makes the respective movement vector be ignored for this turn.
1107: * Graphs are not unambiguous, because circles in graphs can be
1108: * walked in either direction.
1109: */
1110:
1111: /*
1112: * Field sizes for the random art. Have to be odd, so the starting point
1113: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1114: * Else pictures would be too dense, and drawing the frame would
1115: * fail, too, because the key type would not fit in anymore.
1116: */
1117: #define FLDBASE 8
1118: #define FLDSIZE_Y (FLDBASE + 1)
1119: #define FLDSIZE_X (FLDBASE * 2 + 1)
1120: static char *
1.7 djm 1121: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1122: const struct sshkey *k)
1123: {
1124: /*
1125: * Chars to be used after each other every time the worm
1126: * intersects with itself. Matter of taste.
1127: */
1128: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1129: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1130: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1131: size_t i, tlen, hlen;
1.1 djm 1132: u_int b;
1.3 djm 1133: int x, y, r;
1.1 djm 1134: size_t len = strlen(augmentation_string) - 1;
1135:
1136: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1137: return NULL;
1138:
1139: /* initialize field */
1140: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1141: x = FLDSIZE_X / 2;
1142: y = FLDSIZE_Y / 2;
1143:
1144: /* process raw key */
1145: for (i = 0; i < dgst_raw_len; i++) {
1146: int input;
1147: /* each byte conveys four 2-bit move commands */
1148: input = dgst_raw[i];
1149: for (b = 0; b < 4; b++) {
1150: /* evaluate 2 bit, rest is shifted later */
1151: x += (input & 0x1) ? 1 : -1;
1152: y += (input & 0x2) ? 1 : -1;
1153:
1154: /* assure we are still in bounds */
1.37 deraadt 1155: x = MAXIMUM(x, 0);
1156: y = MAXIMUM(y, 0);
1157: x = MINIMUM(x, FLDSIZE_X - 1);
1158: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1159:
1160: /* augment the field */
1161: if (field[x][y] < len - 2)
1162: field[x][y]++;
1163: input = input >> 2;
1164: }
1165: }
1166:
1167: /* mark starting point and end point*/
1168: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1169: field[x][y] = len;
1170:
1.3 djm 1171: /* assemble title */
1172: r = snprintf(title, sizeof(title), "[%s %u]",
1173: sshkey_type(k), sshkey_size(k));
1174: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1175: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1176: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1177: tlen = (r <= 0) ? 0 : strlen(title);
1178:
1179: /* assemble hash ID. */
1180: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1181: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1182:
1183: /* output upper border */
1.3 djm 1184: p = retval;
1185: *p++ = '+';
1186: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1187: *p++ = '-';
1188: memcpy(p, title, tlen);
1189: p += tlen;
1.7 djm 1190: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1191: *p++ = '-';
1192: *p++ = '+';
1193: *p++ = '\n';
1194:
1195: /* output content */
1196: for (y = 0; y < FLDSIZE_Y; y++) {
1197: *p++ = '|';
1198: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1199: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1200: *p++ = '|';
1201: *p++ = '\n';
1202: }
1203:
1204: /* output lower border */
1205: *p++ = '+';
1.7 djm 1206: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1207: *p++ = '-';
1208: memcpy(p, hash, hlen);
1209: p += hlen;
1210: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1211: *p++ = '-';
1212: *p++ = '+';
1213:
1214: return retval;
1215: }
1216:
1217: char *
1.7 djm 1218: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1219: enum sshkey_fp_rep dgst_rep)
1220: {
1221: char *retval = NULL;
1222: u_char *dgst_raw;
1223: size_t dgst_raw_len;
1224:
1.7 djm 1225: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1226: return NULL;
1227: switch (dgst_rep) {
1.7 djm 1228: case SSH_FP_DEFAULT:
1229: if (dgst_alg == SSH_DIGEST_MD5) {
1230: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1231: dgst_raw, dgst_raw_len);
1232: } else {
1233: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1234: dgst_raw, dgst_raw_len);
1235: }
1236: break;
1.1 djm 1237: case SSH_FP_HEX:
1.7 djm 1238: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1239: dgst_raw, dgst_raw_len);
1240: break;
1241: case SSH_FP_BASE64:
1242: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1243: dgst_raw, dgst_raw_len);
1.1 djm 1244: break;
1245: case SSH_FP_BUBBLEBABBLE:
1246: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1247: break;
1248: case SSH_FP_RANDOMART:
1.7 djm 1249: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1250: dgst_raw, dgst_raw_len, k);
1.1 djm 1251: break;
1252: default:
1253: explicit_bzero(dgst_raw, dgst_raw_len);
1254: free(dgst_raw);
1255: return NULL;
1256: }
1257: explicit_bzero(dgst_raw, dgst_raw_len);
1258: free(dgst_raw);
1259: return retval;
1260: }
1261:
1.63 djm 1262: static int
1263: peek_type_nid(const char *s, size_t l, int *nid)
1264: {
1265: const struct keytype *kt;
1266:
1267: for (kt = keytypes; kt->type != -1; kt++) {
1268: if (kt->name == NULL || strlen(kt->name) != l)
1269: continue;
1270: if (memcmp(s, kt->name, l) == 0) {
1271: *nid = -1;
1.85 djm 1272: if (key_type_is_ecdsa_variant(kt->type))
1.63 djm 1273: *nid = kt->nid;
1274: return kt->type;
1275: }
1276: }
1277: return KEY_UNSPEC;
1278: }
1279:
1.1 djm 1280:
1.63 djm 1281: /* XXX this can now be made const char * */
1.1 djm 1282: int
1283: sshkey_read(struct sshkey *ret, char **cpp)
1284: {
1285: struct sshkey *k;
1.63 djm 1286: char *cp, *blobcopy;
1287: size_t space;
1.1 djm 1288: int r, type, curve_nid = -1;
1289: struct sshbuf *blob;
1.44 dtucker 1290:
1291: if (ret == NULL)
1292: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1293:
1294: switch (ret->type) {
1295: case KEY_UNSPEC:
1296: case KEY_RSA:
1297: case KEY_DSA:
1298: case KEY_ECDSA:
1.85 djm 1299: case KEY_ECDSA_SK:
1.1 djm 1300: case KEY_ED25519:
1.90 markus 1301: case KEY_ED25519_SK:
1.1 djm 1302: case KEY_DSA_CERT:
1303: case KEY_ECDSA_CERT:
1.85 djm 1304: case KEY_ECDSA_SK_CERT:
1.1 djm 1305: case KEY_RSA_CERT:
1306: case KEY_ED25519_CERT:
1.90 markus 1307: case KEY_ED25519_SK_CERT:
1.62 markus 1308: #ifdef WITH_XMSS
1309: case KEY_XMSS:
1310: case KEY_XMSS_CERT:
1311: #endif /* WITH_XMSS */
1.63 djm 1312: break; /* ok */
1313: default:
1314: return SSH_ERR_INVALID_ARGUMENT;
1315: }
1316:
1317: /* Decode type */
1318: cp = *cpp;
1319: space = strcspn(cp, " \t");
1320: if (space == strlen(cp))
1321: return SSH_ERR_INVALID_FORMAT;
1322: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1323: return SSH_ERR_INVALID_FORMAT;
1324:
1325: /* skip whitespace */
1326: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1327: ;
1328: if (*cp == '\0')
1329: return SSH_ERR_INVALID_FORMAT;
1330: if (ret->type != KEY_UNSPEC && ret->type != type)
1331: return SSH_ERR_KEY_TYPE_MISMATCH;
1332: if ((blob = sshbuf_new()) == NULL)
1333: return SSH_ERR_ALLOC_FAIL;
1334:
1335: /* find end of keyblob and decode */
1336: space = strcspn(cp, " \t");
1337: if ((blobcopy = strndup(cp, space)) == NULL) {
1338: sshbuf_free(blob);
1339: return SSH_ERR_ALLOC_FAIL;
1340: }
1341: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1342: free(blobcopy);
1343: sshbuf_free(blob);
1344: return r;
1345: }
1346: free(blobcopy);
1347: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1348: sshbuf_free(blob);
1.63 djm 1349: return r;
1350: }
1351: sshbuf_free(blob);
1352:
1353: /* skip whitespace and leave cp at start of comment */
1354: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1355: ;
1356:
1357: /* ensure type of blob matches type at start of line */
1358: if (k->type != type) {
1359: sshkey_free(k);
1360: return SSH_ERR_KEY_TYPE_MISMATCH;
1361: }
1.85 djm 1362: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1363: sshkey_free(k);
1364: return SSH_ERR_EC_CURVE_MISMATCH;
1365: }
1366:
1367: /* Fill in ret from parsed key */
1368: ret->type = type;
1369: if (sshkey_is_cert(ret)) {
1370: if (!sshkey_is_cert(k)) {
1.1 djm 1371: sshkey_free(k);
1.63 djm 1372: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1373: }
1.63 djm 1374: if (ret->cert != NULL)
1375: cert_free(ret->cert);
1376: ret->cert = k->cert;
1377: k->cert = NULL;
1378: }
1379: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1380: #ifdef WITH_OPENSSL
1.63 djm 1381: case KEY_RSA:
1382: RSA_free(ret->rsa);
1383: ret->rsa = k->rsa;
1384: k->rsa = NULL;
1.1 djm 1385: #ifdef DEBUG_PK
1.63 djm 1386: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1387: #endif
1.63 djm 1388: break;
1389: case KEY_DSA:
1390: DSA_free(ret->dsa);
1391: ret->dsa = k->dsa;
1392: k->dsa = NULL;
1.1 djm 1393: #ifdef DEBUG_PK
1.63 djm 1394: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1395: #endif
1.63 djm 1396: break;
1397: case KEY_ECDSA:
1398: EC_KEY_free(ret->ecdsa);
1399: ret->ecdsa = k->ecdsa;
1400: ret->ecdsa_nid = k->ecdsa_nid;
1401: k->ecdsa = NULL;
1402: k->ecdsa_nid = -1;
1.1 djm 1403: #ifdef DEBUG_PK
1.63 djm 1404: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1405: #endif
1.63 djm 1406: break;
1.85 djm 1407: case KEY_ECDSA_SK:
1408: EC_KEY_free(ret->ecdsa);
1409: ret->ecdsa = k->ecdsa;
1410: ret->ecdsa_nid = k->ecdsa_nid;
1411: ret->sk_application = k->sk_application;
1412: k->ecdsa = NULL;
1413: k->ecdsa_nid = -1;
1414: k->sk_application = NULL;
1415: #ifdef DEBUG_PK
1416: sshkey_dump_ec_key(ret->ecdsa);
1417: fprintf(stderr, "App: %s\n", ret->sk_application);
1418: #endif
1419: break;
1.1 djm 1420: #endif /* WITH_OPENSSL */
1.63 djm 1421: case KEY_ED25519:
1422: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1423: ret->ed25519_pk = k->ed25519_pk;
1424: k->ed25519_pk = NULL;
1.1 djm 1425: #ifdef DEBUG_PK
1.63 djm 1426: /* XXX */
1.1 djm 1427: #endif
1.63 djm 1428: break;
1.90 markus 1429: case KEY_ED25519_SK:
1430: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1431: ret->ed25519_pk = k->ed25519_pk;
1432: ret->sk_application = k->sk_application;
1433: k->ed25519_pk = NULL;
1434: k->sk_application = NULL;
1435: break;
1.62 markus 1436: #ifdef WITH_XMSS
1.63 djm 1437: case KEY_XMSS:
1438: free(ret->xmss_pk);
1439: ret->xmss_pk = k->xmss_pk;
1440: k->xmss_pk = NULL;
1441: free(ret->xmss_state);
1442: ret->xmss_state = k->xmss_state;
1443: k->xmss_state = NULL;
1444: free(ret->xmss_name);
1445: ret->xmss_name = k->xmss_name;
1446: k->xmss_name = NULL;
1447: free(ret->xmss_filename);
1448: ret->xmss_filename = k->xmss_filename;
1449: k->xmss_filename = NULL;
1.62 markus 1450: #ifdef DEBUG_PK
1.63 djm 1451: /* XXX */
1.62 markus 1452: #endif
1.63 djm 1453: break;
1.62 markus 1454: #endif /* WITH_XMSS */
1.63 djm 1455: default:
1.1 djm 1456: sshkey_free(k);
1.63 djm 1457: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1458: }
1.63 djm 1459: sshkey_free(k);
1460:
1461: /* success */
1462: *cpp = cp;
1463: return 0;
1.1 djm 1464: }
1465:
1466: int
1.19 djm 1467: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1468: {
1.19 djm 1469: int r = SSH_ERR_INTERNAL_ERROR;
1470: struct sshbuf *b = NULL;
1.1 djm 1471: char *uu = NULL;
1.19 djm 1472:
1473: if (b64p != NULL)
1474: *b64p = NULL;
1475: if ((b = sshbuf_new()) == NULL)
1476: return SSH_ERR_ALLOC_FAIL;
1477: if ((r = sshkey_putb(key, b)) != 0)
1478: goto out;
1.81 djm 1479: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1480: r = SSH_ERR_ALLOC_FAIL;
1481: goto out;
1482: }
1483: /* Success */
1484: if (b64p != NULL) {
1485: *b64p = uu;
1486: uu = NULL;
1487: }
1488: r = 0;
1489: out:
1490: sshbuf_free(b);
1491: free(uu);
1492: return r;
1493: }
1494:
1.52 djm 1495: int
1.19 djm 1496: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1497: {
1498: int r = SSH_ERR_INTERNAL_ERROR;
1499: char *uu = NULL;
1500:
1.48 djm 1501: if ((r = sshkey_to_base64(key, &uu)) != 0)
1502: goto out;
1503: if ((r = sshbuf_putf(b, "%s %s",
1504: sshkey_ssh_name(key), uu)) != 0)
1505: goto out;
1.19 djm 1506: r = 0;
1507: out:
1508: free(uu);
1509: return r;
1510: }
1511:
1512: int
1513: sshkey_write(const struct sshkey *key, FILE *f)
1514: {
1515: struct sshbuf *b = NULL;
1516: int r = SSH_ERR_INTERNAL_ERROR;
1517:
1518: if ((b = sshbuf_new()) == NULL)
1519: return SSH_ERR_ALLOC_FAIL;
1520: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1521: goto out;
1522: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1523: if (feof(f))
1524: errno = EPIPE;
1.19 djm 1525: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1526: goto out;
1527: }
1.19 djm 1528: /* Success */
1529: r = 0;
1.1 djm 1530: out:
1.19 djm 1531: sshbuf_free(b);
1532: return r;
1.1 djm 1533: }
1534:
1535: const char *
1536: sshkey_cert_type(const struct sshkey *k)
1537: {
1538: switch (k->cert->type) {
1539: case SSH2_CERT_TYPE_USER:
1540: return "user";
1541: case SSH2_CERT_TYPE_HOST:
1542: return "host";
1543: default:
1544: return "unknown";
1545: }
1546: }
1547:
1548: #ifdef WITH_OPENSSL
1549: static int
1550: rsa_generate_private_key(u_int bits, RSA **rsap)
1551: {
1552: RSA *private = NULL;
1553: BIGNUM *f4 = NULL;
1554: int ret = SSH_ERR_INTERNAL_ERROR;
1555:
1.49 djm 1556: if (rsap == NULL)
1557: return SSH_ERR_INVALID_ARGUMENT;
1558: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1559: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1560: return SSH_ERR_KEY_LENGTH;
1.1 djm 1561: *rsap = NULL;
1562: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1563: ret = SSH_ERR_ALLOC_FAIL;
1564: goto out;
1565: }
1566: if (!BN_set_word(f4, RSA_F4) ||
1567: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1568: ret = SSH_ERR_LIBCRYPTO_ERROR;
1569: goto out;
1570: }
1571: *rsap = private;
1572: private = NULL;
1573: ret = 0;
1574: out:
1.60 jsing 1575: RSA_free(private);
1576: BN_free(f4);
1.1 djm 1577: return ret;
1578: }
1579:
1580: static int
1581: dsa_generate_private_key(u_int bits, DSA **dsap)
1582: {
1583: DSA *private;
1584: int ret = SSH_ERR_INTERNAL_ERROR;
1585:
1.49 djm 1586: if (dsap == NULL)
1.1 djm 1587: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1588: if (bits != 1024)
1589: return SSH_ERR_KEY_LENGTH;
1.1 djm 1590: if ((private = DSA_new()) == NULL) {
1591: ret = SSH_ERR_ALLOC_FAIL;
1592: goto out;
1593: }
1594: *dsap = NULL;
1595: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1596: NULL, NULL) || !DSA_generate_key(private)) {
1597: ret = SSH_ERR_LIBCRYPTO_ERROR;
1598: goto out;
1599: }
1600: *dsap = private;
1601: private = NULL;
1602: ret = 0;
1603: out:
1.60 jsing 1604: DSA_free(private);
1.1 djm 1605: return ret;
1606: }
1607:
1608: int
1609: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1610: {
1611: EC_GROUP *eg;
1612: int nids[] = {
1613: NID_X9_62_prime256v1,
1614: NID_secp384r1,
1615: NID_secp521r1,
1616: -1
1617: };
1618: int nid;
1619: u_int i;
1620: const EC_GROUP *g = EC_KEY_get0_group(k);
1621:
1622: /*
1623: * The group may be stored in a ASN.1 encoded private key in one of two
1624: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1625: * or explicit group parameters encoded into the key blob. Only the
1626: * "named group" case sets the group NID for us, but we can figure
1627: * it out for the other case by comparing against all the groups that
1628: * are supported.
1629: */
1630: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1631: return nid;
1632: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1633: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1634: return -1;
1.93 djm 1635: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1636: break;
1637: EC_GROUP_free(eg);
1638: }
1639: if (nids[i] != -1) {
1640: /* Use the group with the NID attached */
1641: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1642: if (EC_KEY_set_group(k, eg) != 1) {
1643: EC_GROUP_free(eg);
1644: return -1;
1645: }
1646: }
1647: return nids[i];
1648: }
1649:
1650: static int
1651: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1652: {
1653: EC_KEY *private;
1654: int ret = SSH_ERR_INTERNAL_ERROR;
1655:
1.50 djm 1656: if (nid == NULL || ecdsap == NULL)
1.1 djm 1657: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1658: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1659: return SSH_ERR_KEY_LENGTH;
1.1 djm 1660: *ecdsap = NULL;
1661: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1662: ret = SSH_ERR_ALLOC_FAIL;
1663: goto out;
1664: }
1665: if (EC_KEY_generate_key(private) != 1) {
1666: ret = SSH_ERR_LIBCRYPTO_ERROR;
1667: goto out;
1668: }
1669: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1670: *ecdsap = private;
1671: private = NULL;
1672: ret = 0;
1673: out:
1.60 jsing 1674: EC_KEY_free(private);
1.1 djm 1675: return ret;
1676: }
1677: #endif /* WITH_OPENSSL */
1678:
1679: int
1680: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1681: {
1682: struct sshkey *k;
1683: int ret = SSH_ERR_INTERNAL_ERROR;
1684:
1685: if (keyp == NULL)
1686: return SSH_ERR_INVALID_ARGUMENT;
1687: *keyp = NULL;
1688: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1689: return SSH_ERR_ALLOC_FAIL;
1690: switch (type) {
1691: case KEY_ED25519:
1692: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1693: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1694: ret = SSH_ERR_ALLOC_FAIL;
1695: break;
1696: }
1697: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1698: ret = 0;
1699: break;
1.62 markus 1700: #ifdef WITH_XMSS
1701: case KEY_XMSS:
1702: ret = sshkey_xmss_generate_private_key(k, bits);
1703: break;
1704: #endif /* WITH_XMSS */
1.1 djm 1705: #ifdef WITH_OPENSSL
1706: case KEY_DSA:
1707: ret = dsa_generate_private_key(bits, &k->dsa);
1708: break;
1709: case KEY_ECDSA:
1710: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1711: &k->ecdsa);
1712: break;
1713: case KEY_RSA:
1714: ret = rsa_generate_private_key(bits, &k->rsa);
1715: break;
1716: #endif /* WITH_OPENSSL */
1717: default:
1718: ret = SSH_ERR_INVALID_ARGUMENT;
1719: }
1720: if (ret == 0) {
1721: k->type = type;
1722: *keyp = k;
1723: } else
1724: sshkey_free(k);
1725: return ret;
1726: }
1727:
1728: int
1729: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1730: {
1731: u_int i;
1732: const struct sshkey_cert *from;
1733: struct sshkey_cert *to;
1.67 djm 1734: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1735:
1.67 djm 1736: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1737: return SSH_ERR_INVALID_ARGUMENT;
1738:
1.67 djm 1739: if ((to = cert_new()) == NULL)
1.1 djm 1740: return SSH_ERR_ALLOC_FAIL;
1741:
1.67 djm 1742: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1743: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1744: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1745: goto out;
1.1 djm 1746:
1747: to->serial = from->serial;
1748: to->type = from->type;
1749: if (from->key_id == NULL)
1750: to->key_id = NULL;
1.67 djm 1751: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1752: r = SSH_ERR_ALLOC_FAIL;
1753: goto out;
1754: }
1.1 djm 1755: to->valid_after = from->valid_after;
1756: to->valid_before = from->valid_before;
1757: if (from->signature_key == NULL)
1758: to->signature_key = NULL;
1.67 djm 1759: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1760: &to->signature_key)) != 0)
1.67 djm 1761: goto out;
1762: if (from->signature_type != NULL &&
1763: (to->signature_type = strdup(from->signature_type)) == NULL) {
1764: r = SSH_ERR_ALLOC_FAIL;
1765: goto out;
1766: }
1767: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1768: r = SSH_ERR_INVALID_ARGUMENT;
1769: goto out;
1770: }
1.1 djm 1771: if (from->nprincipals > 0) {
1772: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1773: sizeof(*to->principals))) == NULL) {
1774: r = SSH_ERR_ALLOC_FAIL;
1775: goto out;
1776: }
1.1 djm 1777: for (i = 0; i < from->nprincipals; i++) {
1778: to->principals[i] = strdup(from->principals[i]);
1779: if (to->principals[i] == NULL) {
1780: to->nprincipals = i;
1.67 djm 1781: r = SSH_ERR_ALLOC_FAIL;
1782: goto out;
1.1 djm 1783: }
1784: }
1785: }
1786: to->nprincipals = from->nprincipals;
1.67 djm 1787:
1788: /* success */
1789: cert_free(to_key->cert);
1790: to_key->cert = to;
1791: to = NULL;
1792: r = 0;
1793: out:
1794: cert_free(to);
1795: return r;
1.1 djm 1796: }
1797:
1798: int
1799: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1800: {
1801: struct sshkey *n = NULL;
1.69 djm 1802: int r = SSH_ERR_INTERNAL_ERROR;
1803: #ifdef WITH_OPENSSL
1804: const BIGNUM *rsa_n, *rsa_e;
1805: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1806: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1807: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1808: BIGNUM *dsa_pub_key_dup = NULL;
1809: #endif /* WITH_OPENSSL */
1.1 djm 1810:
1.24 djm 1811: *pkp = NULL;
1.85 djm 1812: if ((n = sshkey_new(k->type)) == NULL) {
1813: r = SSH_ERR_ALLOC_FAIL;
1814: goto out;
1815: }
1.1 djm 1816: switch (k->type) {
1817: #ifdef WITH_OPENSSL
1818: case KEY_DSA:
1819: case KEY_DSA_CERT:
1.69 djm 1820: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1821: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1822: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1823: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1824: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1825: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1826: r = SSH_ERR_ALLOC_FAIL;
1827: goto out;
1828: }
1829: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1830: r = SSH_ERR_LIBCRYPTO_ERROR;
1831: goto out;
1.1 djm 1832: }
1.69 djm 1833: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1834: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1835: r = SSH_ERR_LIBCRYPTO_ERROR;
1836: goto out;
1837: }
1838: dsa_pub_key_dup = NULL; /* transferred */
1839:
1.1 djm 1840: break;
1841: case KEY_ECDSA:
1842: case KEY_ECDSA_CERT:
1.85 djm 1843: case KEY_ECDSA_SK:
1844: case KEY_ECDSA_SK_CERT:
1.1 djm 1845: n->ecdsa_nid = k->ecdsa_nid;
1846: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1847: if (n->ecdsa == NULL) {
1.69 djm 1848: r = SSH_ERR_ALLOC_FAIL;
1849: goto out;
1.1 djm 1850: }
1851: if (EC_KEY_set_public_key(n->ecdsa,
1852: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1853: r = SSH_ERR_LIBCRYPTO_ERROR;
1854: goto out;
1.1 djm 1855: }
1.85 djm 1856: if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT)
1857: break;
1858: /* Append security-key application string */
1859: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1860: goto out;
1.1 djm 1861: break;
1862: case KEY_RSA:
1863: case KEY_RSA_CERT:
1.69 djm 1864: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1865: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1866: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1867: r = SSH_ERR_ALLOC_FAIL;
1868: goto out;
1869: }
1870: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1871: r = SSH_ERR_LIBCRYPTO_ERROR;
1872: goto out;
1873: }
1874: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1875: break;
1876: #endif /* WITH_OPENSSL */
1877: case KEY_ED25519:
1878: case KEY_ED25519_CERT:
1.90 markus 1879: case KEY_ED25519_SK:
1880: case KEY_ED25519_SK_CERT:
1.1 djm 1881: if (k->ed25519_pk != NULL) {
1882: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1883: r = SSH_ERR_ALLOC_FAIL;
1884: goto out;
1.1 djm 1885: }
1886: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1887: }
1.90 markus 1888: if (k->type != KEY_ED25519_SK &&
1889: k->type != KEY_ED25519_SK_CERT)
1890: break;
1891: /* Append security-key application string */
1892: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1893: goto out;
1.1 djm 1894: break;
1.62 markus 1895: #ifdef WITH_XMSS
1896: case KEY_XMSS:
1897: case KEY_XMSS_CERT:
1.69 djm 1898: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1899: goto out;
1.62 markus 1900: if (k->xmss_pk != NULL) {
1.92 markus 1901: u_int32_t left;
1.62 markus 1902: size_t pklen = sshkey_xmss_pklen(k);
1903: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1904: r = SSH_ERR_INTERNAL_ERROR;
1905: goto out;
1.62 markus 1906: }
1907: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1908: r = SSH_ERR_ALLOC_FAIL;
1909: goto out;
1.62 markus 1910: }
1911: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1.92 markus 1912: /* simulate number of signatures left on pubkey */
1913: left = sshkey_xmss_signatures_left(k);
1914: if (left)
1915: sshkey_xmss_enable_maxsign(n, left);
1.62 markus 1916: }
1917: break;
1918: #endif /* WITH_XMSS */
1.1 djm 1919: default:
1.69 djm 1920: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1921: goto out;
1.1 djm 1922: }
1.69 djm 1923: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1924: goto out;
1925: /* success */
1.1 djm 1926: *pkp = n;
1.69 djm 1927: n = NULL;
1928: r = 0;
1929: out:
1930: sshkey_free(n);
1.83 djm 1931: #ifdef WITH_OPENSSL
1.69 djm 1932: BN_clear_free(rsa_n_dup);
1933: BN_clear_free(rsa_e_dup);
1934: BN_clear_free(dsa_p_dup);
1935: BN_clear_free(dsa_q_dup);
1936: BN_clear_free(dsa_g_dup);
1937: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1938: #endif /* WITH_OPENSSL */
1.69 djm 1939:
1940: return r;
1.1 djm 1941: }
1942:
1.76 djm 1943: int
1944: sshkey_is_shielded(struct sshkey *k)
1945: {
1946: return k != NULL && k->shielded_private != NULL;
1947: }
1948:
1949: int
1950: sshkey_shield_private(struct sshkey *k)
1951: {
1952: struct sshbuf *prvbuf = NULL;
1953: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1954: struct sshcipher_ctx *cctx = NULL;
1955: const struct sshcipher *cipher;
1956: size_t i, enclen = 0;
1957: struct sshkey *kswap = NULL, tmp;
1958: int r = SSH_ERR_INTERNAL_ERROR;
1959:
1960: #ifdef DEBUG_PK
1961: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1962: #endif
1963: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1964: r = SSH_ERR_INVALID_ARGUMENT;
1965: goto out;
1966: }
1967: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1968: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1969: r = SSH_ERR_INTERNAL_ERROR;
1970: goto out;
1971: }
1972:
1973: /* Prepare a random pre-key, and from it an ephemeral key */
1974: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1975: r = SSH_ERR_ALLOC_FAIL;
1976: goto out;
1977: }
1978: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1979: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1980: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1981: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1982: goto out;
1983: #ifdef DEBUG_PK
1984: fprintf(stderr, "%s: key+iv\n", __func__);
1985: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1986: stderr);
1987: #endif
1988: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1989: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1990: goto out;
1991:
1992: /* Serialise and encrypt the private key using the ephemeral key */
1993: if ((prvbuf = sshbuf_new()) == NULL) {
1994: r = SSH_ERR_ALLOC_FAIL;
1995: goto out;
1996: }
1997: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1998: goto out;
1999: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.91 markus 2000: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 2001: goto out;
2002: /* pad to cipher blocksize */
2003: i = 0;
2004: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
2005: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
2006: goto out;
2007: }
2008: #ifdef DEBUG_PK
2009: fprintf(stderr, "%s: serialised\n", __func__);
2010: sshbuf_dump(prvbuf, stderr);
2011: #endif
2012: /* encrypt */
2013: enclen = sshbuf_len(prvbuf);
2014: if ((enc = malloc(enclen)) == NULL) {
2015: r = SSH_ERR_ALLOC_FAIL;
2016: goto out;
2017: }
2018: if ((r = cipher_crypt(cctx, 0, enc,
2019: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
2020: goto out;
2021: #ifdef DEBUG_PK
2022: fprintf(stderr, "%s: encrypted\n", __func__);
2023: sshbuf_dump_data(enc, enclen, stderr);
2024: #endif
2025:
2026: /* Make a scrubbed, public-only copy of our private key argument */
2027: if ((r = sshkey_from_private(k, &kswap)) != 0)
2028: goto out;
2029:
2030: /* Swap the private key out (it will be destroyed below) */
2031: tmp = *kswap;
2032: *kswap = *k;
2033: *k = tmp;
2034:
2035: /* Insert the shielded key into our argument */
2036: k->shielded_private = enc;
2037: k->shielded_len = enclen;
2038: k->shield_prekey = prekey;
2039: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
2040: enc = prekey = NULL; /* transferred */
2041: enclen = 0;
2042:
2043: /* success */
2044: r = 0;
2045:
2046: out:
2047: /* XXX behaviour on error - invalidate original private key? */
2048: cipher_free(cctx);
2049: explicit_bzero(keyiv, sizeof(keyiv));
2050: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 2051: freezero(enc, enclen);
1.76 djm 2052: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
2053: sshkey_free(kswap);
2054: sshbuf_free(prvbuf);
2055: return r;
2056: }
2057:
2058: int
2059: sshkey_unshield_private(struct sshkey *k)
2060: {
2061: struct sshbuf *prvbuf = NULL;
2062: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
2063: struct sshcipher_ctx *cctx = NULL;
2064: const struct sshcipher *cipher;
2065: size_t i;
2066: struct sshkey *kswap = NULL, tmp;
2067: int r = SSH_ERR_INTERNAL_ERROR;
2068:
2069: #ifdef DEBUG_PK
2070: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
2071: #endif
2072: if (!sshkey_is_shielded(k))
2073: return 0; /* nothing to do */
2074:
2075: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
2076: r = SSH_ERR_INVALID_ARGUMENT;
2077: goto out;
2078: }
2079: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
2080: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
2081: r = SSH_ERR_INTERNAL_ERROR;
2082: goto out;
2083: }
2084: /* check size of shielded key blob */
2085: if (k->shielded_len < cipher_blocksize(cipher) ||
2086: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
2087: r = SSH_ERR_INVALID_FORMAT;
2088: goto out;
2089: }
2090:
2091: /* Calculate the ephemeral key from the prekey */
2092: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2093: k->shield_prekey, k->shield_prekey_len,
2094: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2095: goto out;
2096: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2097: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2098: goto out;
2099: #ifdef DEBUG_PK
2100: fprintf(stderr, "%s: key+iv\n", __func__);
2101: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2102: stderr);
2103: #endif
2104:
2105: /* Decrypt and parse the shielded private key using the ephemeral key */
2106: if ((prvbuf = sshbuf_new()) == NULL) {
2107: r = SSH_ERR_ALLOC_FAIL;
2108: goto out;
2109: }
2110: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2111: goto out;
2112: /* decrypt */
2113: #ifdef DEBUG_PK
2114: fprintf(stderr, "%s: encrypted\n", __func__);
2115: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2116: #endif
2117: if ((r = cipher_crypt(cctx, 0, cp,
2118: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2119: goto out;
2120: #ifdef DEBUG_PK
2121: fprintf(stderr, "%s: serialised\n", __func__);
2122: sshbuf_dump(prvbuf, stderr);
2123: #endif
2124: /* Parse private key */
2125: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2126: goto out;
2127: /* Check deterministic padding */
2128: i = 0;
2129: while (sshbuf_len(prvbuf)) {
2130: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2131: goto out;
2132: if (pad != (++i & 0xff)) {
2133: r = SSH_ERR_INVALID_FORMAT;
2134: goto out;
2135: }
2136: }
2137:
2138: /* Swap the parsed key back into place */
2139: tmp = *kswap;
2140: *kswap = *k;
2141: *k = tmp;
2142:
2143: /* success */
2144: r = 0;
2145:
2146: out:
2147: cipher_free(cctx);
2148: explicit_bzero(keyiv, sizeof(keyiv));
2149: explicit_bzero(&tmp, sizeof(tmp));
2150: sshkey_free(kswap);
2151: sshbuf_free(prvbuf);
2152: return r;
2153: }
2154:
1.1 djm 2155: static int
1.14 djm 2156: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2157: {
1.14 djm 2158: struct sshbuf *principals = NULL, *crit = NULL;
2159: struct sshbuf *exts = NULL, *ca = NULL;
2160: u_char *sig = NULL;
2161: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2162: int ret = SSH_ERR_INTERNAL_ERROR;
2163:
2164: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2165: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2166: return ret;
2167:
1.20 djm 2168: /* Parse body of certificate up to signature */
2169: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2170: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2171: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2172: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2173: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2174: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2175: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2176: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2177: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2178: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2179: /* XXX debug print error for ret */
2180: ret = SSH_ERR_INVALID_FORMAT;
2181: goto out;
2182: }
2183:
2184: /* Signature is left in the buffer so we can calculate this length */
2185: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2186:
2187: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2188: ret = SSH_ERR_INVALID_FORMAT;
2189: goto out;
2190: }
2191:
2192: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2193: key->cert->type != SSH2_CERT_TYPE_HOST) {
2194: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2195: goto out;
2196: }
2197:
1.4 djm 2198: /* Parse principals section */
2199: while (sshbuf_len(principals) > 0) {
2200: char *principal = NULL;
2201: char **oprincipals = NULL;
2202:
1.1 djm 2203: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2204: ret = SSH_ERR_INVALID_FORMAT;
2205: goto out;
2206: }
1.4 djm 2207: if ((ret = sshbuf_get_cstring(principals, &principal,
2208: NULL)) != 0) {
1.1 djm 2209: ret = SSH_ERR_INVALID_FORMAT;
2210: goto out;
2211: }
2212: oprincipals = key->cert->principals;
1.51 deraadt 2213: key->cert->principals = recallocarray(key->cert->principals,
2214: key->cert->nprincipals, key->cert->nprincipals + 1,
2215: sizeof(*key->cert->principals));
1.1 djm 2216: if (key->cert->principals == NULL) {
2217: free(principal);
2218: key->cert->principals = oprincipals;
2219: ret = SSH_ERR_ALLOC_FAIL;
2220: goto out;
2221: }
2222: key->cert->principals[key->cert->nprincipals++] = principal;
2223: }
2224:
1.4 djm 2225: /*
2226: * Stash a copies of the critical options and extensions sections
2227: * for later use.
2228: */
2229: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2230: (exts != NULL &&
2231: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2232: goto out;
2233:
1.4 djm 2234: /*
2235: * Validate critical options and extensions sections format.
2236: */
2237: while (sshbuf_len(crit) != 0) {
2238: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2239: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2240: sshbuf_reset(key->cert->critical);
1.1 djm 2241: ret = SSH_ERR_INVALID_FORMAT;
2242: goto out;
2243: }
2244: }
1.4 djm 2245: while (exts != NULL && sshbuf_len(exts) != 0) {
2246: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2247: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2248: sshbuf_reset(key->cert->extensions);
1.1 djm 2249: ret = SSH_ERR_INVALID_FORMAT;
2250: goto out;
2251: }
2252: }
2253:
1.4 djm 2254: /* Parse CA key and check signature */
1.14 djm 2255: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2256: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2257: goto out;
2258: }
2259: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2260: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2261: goto out;
2262: }
2263: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 2264: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 2265: goto out;
1.82 djm 2266: if ((ret = sshkey_get_sigtype(sig, slen,
2267: &key->cert->signature_type)) != 0)
1.67 djm 2268: goto out;
1.4 djm 2269:
2270: /* Success */
1.1 djm 2271: ret = 0;
2272: out:
1.14 djm 2273: sshbuf_free(ca);
1.4 djm 2274: sshbuf_free(crit);
2275: sshbuf_free(exts);
2276: sshbuf_free(principals);
1.1 djm 2277: free(sig);
2278: return ret;
2279: }
2280:
1.83 djm 2281: #ifdef WITH_OPENSSL
1.1 djm 2282: static int
1.69 djm 2283: check_rsa_length(const RSA *rsa)
2284: {
2285: const BIGNUM *rsa_n;
2286:
2287: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2288: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2289: return SSH_ERR_KEY_LENGTH;
2290: return 0;
2291: }
1.83 djm 2292: #endif /* WITH_OPENSSL */
1.69 djm 2293:
2294: static int
1.14 djm 2295: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2296: int allow_cert)
1.1 djm 2297: {
1.12 djm 2298: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2299: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2300: struct sshkey *key = NULL;
2301: size_t len;
2302: u_char *pk = NULL;
1.14 djm 2303: struct sshbuf *copy;
1.1 djm 2304: #ifdef WITH_OPENSSL
2305: EC_POINT *q = NULL;
1.69 djm 2306: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2307: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2308: #endif /* WITH_OPENSSL */
2309:
2310: #ifdef DEBUG_PK /* XXX */
1.14 djm 2311: sshbuf_dump(b, stderr);
1.1 djm 2312: #endif
1.32 djm 2313: if (keyp != NULL)
2314: *keyp = NULL;
1.14 djm 2315: if ((copy = sshbuf_fromb(b)) == NULL) {
2316: ret = SSH_ERR_ALLOC_FAIL;
2317: goto out;
2318: }
1.1 djm 2319: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2320: ret = SSH_ERR_INVALID_FORMAT;
2321: goto out;
2322: }
2323:
2324: type = sshkey_type_from_name(ktype);
2325: if (!allow_cert && sshkey_type_is_cert(type)) {
2326: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2327: goto out;
2328: }
2329: switch (type) {
2330: #ifdef WITH_OPENSSL
2331: case KEY_RSA_CERT:
1.14 djm 2332: /* Skip nonce */
1.1 djm 2333: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2334: ret = SSH_ERR_INVALID_FORMAT;
2335: goto out;
2336: }
2337: /* FALLTHROUGH */
2338: case KEY_RSA:
2339: if ((key = sshkey_new(type)) == NULL) {
2340: ret = SSH_ERR_ALLOC_FAIL;
2341: goto out;
2342: }
1.73 djm 2343: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2344: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2345: ret = SSH_ERR_INVALID_FORMAT;
2346: goto out;
2347: }
1.69 djm 2348: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2349: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2350: goto out;
2351: }
1.69 djm 2352: rsa_n = rsa_e = NULL; /* transferred */
2353: if ((ret = check_rsa_length(key->rsa)) != 0)
2354: goto out;
1.1 djm 2355: #ifdef DEBUG_PK
2356: RSA_print_fp(stderr, key->rsa, 8);
2357: #endif
2358: break;
2359: case KEY_DSA_CERT:
1.14 djm 2360: /* Skip nonce */
1.1 djm 2361: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2362: ret = SSH_ERR_INVALID_FORMAT;
2363: goto out;
2364: }
2365: /* FALLTHROUGH */
2366: case KEY_DSA:
2367: if ((key = sshkey_new(type)) == NULL) {
2368: ret = SSH_ERR_ALLOC_FAIL;
2369: goto out;
2370: }
1.73 djm 2371: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2372: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2373: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2374: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2375: ret = SSH_ERR_INVALID_FORMAT;
2376: goto out;
2377: }
1.69 djm 2378: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2379: ret = SSH_ERR_LIBCRYPTO_ERROR;
2380: goto out;
2381: }
2382: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2383: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2384: ret = SSH_ERR_LIBCRYPTO_ERROR;
2385: goto out;
2386: }
2387: dsa_pub_key = NULL; /* transferred */
1.1 djm 2388: #ifdef DEBUG_PK
2389: DSA_print_fp(stderr, key->dsa, 8);
2390: #endif
2391: break;
2392: case KEY_ECDSA_CERT:
1.85 djm 2393: case KEY_ECDSA_SK_CERT:
1.14 djm 2394: /* Skip nonce */
1.1 djm 2395: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2396: ret = SSH_ERR_INVALID_FORMAT;
2397: goto out;
2398: }
2399: /* FALLTHROUGH */
2400: case KEY_ECDSA:
1.85 djm 2401: case KEY_ECDSA_SK:
1.1 djm 2402: if ((key = sshkey_new(type)) == NULL) {
2403: ret = SSH_ERR_ALLOC_FAIL;
2404: goto out;
2405: }
1.12 djm 2406: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2407: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2408: ret = SSH_ERR_INVALID_FORMAT;
2409: goto out;
2410: }
2411: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2412: ret = SSH_ERR_EC_CURVE_MISMATCH;
2413: goto out;
2414: }
1.60 jsing 2415: EC_KEY_free(key->ecdsa);
1.1 djm 2416: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2417: == NULL) {
2418: ret = SSH_ERR_EC_CURVE_INVALID;
2419: goto out;
2420: }
2421: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2422: ret = SSH_ERR_ALLOC_FAIL;
2423: goto out;
2424: }
2425: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2426: ret = SSH_ERR_INVALID_FORMAT;
2427: goto out;
2428: }
2429: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2430: q) != 0) {
2431: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2432: goto out;
2433: }
2434: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2435: /* XXX assume it is a allocation error */
2436: ret = SSH_ERR_ALLOC_FAIL;
2437: goto out;
2438: }
2439: #ifdef DEBUG_PK
2440: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2441: #endif
1.85 djm 2442: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2443: /* Parse additional security-key application string */
2444: if (sshbuf_get_cstring(b, &key->sk_application,
2445: NULL) != 0) {
2446: ret = SSH_ERR_INVALID_FORMAT;
2447: goto out;
2448: }
2449: #ifdef DEBUG_PK
2450: fprintf(stderr, "App: %s\n", key->sk_application);
2451: #endif
2452: }
1.1 djm 2453: break;
2454: #endif /* WITH_OPENSSL */
2455: case KEY_ED25519_CERT:
1.90 markus 2456: case KEY_ED25519_SK_CERT:
1.14 djm 2457: /* Skip nonce */
1.1 djm 2458: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2459: ret = SSH_ERR_INVALID_FORMAT;
2460: goto out;
2461: }
2462: /* FALLTHROUGH */
2463: case KEY_ED25519:
1.90 markus 2464: case KEY_ED25519_SK:
1.1 djm 2465: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2466: goto out;
2467: if (len != ED25519_PK_SZ) {
2468: ret = SSH_ERR_INVALID_FORMAT;
2469: goto out;
2470: }
2471: if ((key = sshkey_new(type)) == NULL) {
2472: ret = SSH_ERR_ALLOC_FAIL;
2473: goto out;
2474: }
1.90 markus 2475: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2476: /* Parse additional security-key application string */
2477: if (sshbuf_get_cstring(b, &key->sk_application,
2478: NULL) != 0) {
2479: ret = SSH_ERR_INVALID_FORMAT;
2480: goto out;
2481: }
2482: #ifdef DEBUG_PK
2483: fprintf(stderr, "App: %s\n", key->sk_application);
2484: #endif
2485: }
1.1 djm 2486: key->ed25519_pk = pk;
2487: pk = NULL;
2488: break;
1.62 markus 2489: #ifdef WITH_XMSS
2490: case KEY_XMSS_CERT:
2491: /* Skip nonce */
2492: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2493: ret = SSH_ERR_INVALID_FORMAT;
2494: goto out;
2495: }
2496: /* FALLTHROUGH */
2497: case KEY_XMSS:
2498: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2499: goto out;
2500: if ((key = sshkey_new(type)) == NULL) {
2501: ret = SSH_ERR_ALLOC_FAIL;
2502: goto out;
2503: }
2504: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2505: goto out;
2506: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2507: goto out;
2508: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2509: ret = SSH_ERR_INVALID_FORMAT;
2510: goto out;
2511: }
2512: key->xmss_pk = pk;
2513: pk = NULL;
2514: if (type != KEY_XMSS_CERT &&
2515: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2516: goto out;
2517: break;
2518: #endif /* WITH_XMSS */
1.1 djm 2519: case KEY_UNSPEC:
2520: default:
2521: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2522: goto out;
2523: }
2524:
2525: /* Parse certificate potion */
1.14 djm 2526: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2527: goto out;
2528:
2529: if (key != NULL && sshbuf_len(b) != 0) {
2530: ret = SSH_ERR_INVALID_FORMAT;
2531: goto out;
2532: }
2533: ret = 0;
1.32 djm 2534: if (keyp != NULL) {
2535: *keyp = key;
2536: key = NULL;
2537: }
1.1 djm 2538: out:
1.14 djm 2539: sshbuf_free(copy);
1.1 djm 2540: sshkey_free(key);
1.62 markus 2541: free(xmss_name);
1.1 djm 2542: free(ktype);
2543: free(curve);
2544: free(pk);
2545: #ifdef WITH_OPENSSL
1.60 jsing 2546: EC_POINT_free(q);
1.69 djm 2547: BN_clear_free(rsa_n);
2548: BN_clear_free(rsa_e);
2549: BN_clear_free(dsa_p);
2550: BN_clear_free(dsa_q);
2551: BN_clear_free(dsa_g);
2552: BN_clear_free(dsa_pub_key);
1.1 djm 2553: #endif /* WITH_OPENSSL */
2554: return ret;
2555: }
2556:
2557: int
2558: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2559: {
1.14 djm 2560: struct sshbuf *b;
2561: int r;
2562:
2563: if ((b = sshbuf_from(blob, blen)) == NULL)
2564: return SSH_ERR_ALLOC_FAIL;
2565: r = sshkey_from_blob_internal(b, keyp, 1);
2566: sshbuf_free(b);
2567: return r;
2568: }
2569:
2570: int
2571: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2572: {
2573: return sshkey_from_blob_internal(b, keyp, 1);
2574: }
2575:
2576: int
2577: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2578: {
2579: struct sshbuf *b;
2580: int r;
2581:
2582: if ((r = sshbuf_froms(buf, &b)) != 0)
2583: return r;
2584: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2585: sshbuf_free(b);
2586: return r;
2587: }
2588:
1.82 djm 2589: int
2590: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2591: {
2592: int r;
2593: struct sshbuf *b = NULL;
2594: char *sigtype = NULL;
2595:
2596: if (sigtypep != NULL)
2597: *sigtypep = NULL;
2598: if ((b = sshbuf_from(sig, siglen)) == NULL)
2599: return SSH_ERR_ALLOC_FAIL;
2600: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2601: goto out;
2602: /* success */
2603: if (sigtypep != NULL) {
2604: *sigtypep = sigtype;
2605: sigtype = NULL;
2606: }
2607: r = 0;
2608: out:
2609: free(sigtype);
1.14 djm 2610: sshbuf_free(b);
2611: return r;
1.68 djm 2612: }
2613:
2614: /*
2615: *
2616: * Checks whether a certificate's signature type is allowed.
2617: * Returns 0 (success) if the certificate signature type appears in the
2618: * "allowed" pattern-list, or the key is not a certificate to begin with.
2619: * Otherwise returns a ssherr.h code.
2620: */
2621: int
2622: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2623: {
2624: if (key == NULL || allowed == NULL)
2625: return SSH_ERR_INVALID_ARGUMENT;
2626: if (!sshkey_type_is_cert(key->type))
2627: return 0;
2628: if (key->cert == NULL || key->cert->signature_type == NULL)
2629: return SSH_ERR_INVALID_ARGUMENT;
2630: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2631: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2632: return 0;
1.65 djm 2633: }
2634:
2635: /*
2636: * Returns the expected signature algorithm for a given public key algorithm.
2637: */
1.66 djm 2638: const char *
2639: sshkey_sigalg_by_name(const char *name)
1.65 djm 2640: {
2641: const struct keytype *kt;
2642:
2643: for (kt = keytypes; kt->type != -1; kt++) {
2644: if (strcmp(kt->name, name) != 0)
2645: continue;
2646: if (kt->sigalg != NULL)
2647: return kt->sigalg;
2648: if (!kt->cert)
2649: return kt->name;
2650: return sshkey_ssh_name_from_type_nid(
2651: sshkey_type_plain(kt->type), kt->nid);
2652: }
2653: return NULL;
2654: }
2655:
2656: /*
2657: * Verifies that the signature algorithm appearing inside the signature blob
2658: * matches that which was requested.
2659: */
2660: int
2661: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2662: const char *requested_alg)
2663: {
2664: const char *expected_alg;
2665: char *sigtype = NULL;
2666: int r;
2667:
2668: if (requested_alg == NULL)
2669: return 0;
1.66 djm 2670: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2671: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2672: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2673: return r;
2674: r = strcmp(expected_alg, sigtype) == 0;
2675: free(sigtype);
2676: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2677: }
2678:
2679: int
1.76 djm 2680: sshkey_sign(struct sshkey *key,
1.1 djm 2681: u_char **sigp, size_t *lenp,
1.86 djm 2682: const u_char *data, size_t datalen,
2683: const char *alg, const char *sk_provider, u_int compat)
1.1 djm 2684: {
1.76 djm 2685: int was_shielded = sshkey_is_shielded(key);
2686: int r2, r = SSH_ERR_INTERNAL_ERROR;
2687:
1.1 djm 2688: if (sigp != NULL)
2689: *sigp = NULL;
2690: if (lenp != NULL)
2691: *lenp = 0;
2692: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2693: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2694: if ((r = sshkey_unshield_private(key)) != 0)
2695: return r;
1.1 djm 2696: switch (key->type) {
2697: #ifdef WITH_OPENSSL
2698: case KEY_DSA_CERT:
2699: case KEY_DSA:
1.76 djm 2700: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2701: break;
1.1 djm 2702: case KEY_ECDSA_CERT:
2703: case KEY_ECDSA:
1.76 djm 2704: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2705: break;
1.86 djm 2706: case KEY_ECDSA_SK_CERT:
2707: case KEY_ECDSA_SK:
1.88 markus 2708: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2709: compat);
1.86 djm 2710: break;
1.1 djm 2711: case KEY_RSA_CERT:
2712: case KEY_RSA:
1.76 djm 2713: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2714: break;
1.1 djm 2715: #endif /* WITH_OPENSSL */
2716: case KEY_ED25519:
2717: case KEY_ED25519_CERT:
1.76 djm 2718: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2719: break;
2720: case KEY_ED25519_SK:
2721: case KEY_ED25519_SK_CERT:
2722: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2723: compat);
1.76 djm 2724: break;
1.62 markus 2725: #ifdef WITH_XMSS
2726: case KEY_XMSS:
2727: case KEY_XMSS_CERT:
1.76 djm 2728: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2729: break;
1.62 markus 2730: #endif /* WITH_XMSS */
1.1 djm 2731: default:
1.76 djm 2732: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2733: break;
1.1 djm 2734: }
1.76 djm 2735: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2736: return r2;
2737: return r;
1.1 djm 2738: }
2739:
2740: /*
2741: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2742: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2743: */
2744: int
2745: sshkey_verify(const struct sshkey *key,
2746: const u_char *sig, size_t siglen,
1.59 djm 2747: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2748: {
1.6 djm 2749: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2750: return SSH_ERR_INVALID_ARGUMENT;
2751: switch (key->type) {
2752: #ifdef WITH_OPENSSL
2753: case KEY_DSA_CERT:
2754: case KEY_DSA:
2755: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2756: case KEY_ECDSA_CERT:
2757: case KEY_ECDSA:
2758: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2759: case KEY_ECDSA_SK_CERT:
2760: case KEY_ECDSA_SK:
2761: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
2762: compat);
1.1 djm 2763: case KEY_RSA_CERT:
2764: case KEY_RSA:
1.59 djm 2765: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2766: #endif /* WITH_OPENSSL */
2767: case KEY_ED25519:
2768: case KEY_ED25519_CERT:
2769: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2770: case KEY_ED25519_SK:
2771: case KEY_ED25519_SK_CERT:
2772: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
2773: compat);
1.62 markus 2774: #ifdef WITH_XMSS
2775: case KEY_XMSS:
2776: case KEY_XMSS_CERT:
2777: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2778: #endif /* WITH_XMSS */
1.1 djm 2779: default:
2780: return SSH_ERR_KEY_TYPE_UNKNOWN;
2781: }
2782: }
2783:
2784: /* Convert a plain key to their _CERT equivalent */
2785: int
1.20 djm 2786: sshkey_to_certified(struct sshkey *k)
1.1 djm 2787: {
2788: int newtype;
2789:
2790: switch (k->type) {
2791: #ifdef WITH_OPENSSL
2792: case KEY_RSA:
1.20 djm 2793: newtype = KEY_RSA_CERT;
1.1 djm 2794: break;
2795: case KEY_DSA:
1.20 djm 2796: newtype = KEY_DSA_CERT;
1.1 djm 2797: break;
2798: case KEY_ECDSA:
2799: newtype = KEY_ECDSA_CERT;
2800: break;
1.85 djm 2801: case KEY_ECDSA_SK:
2802: newtype = KEY_ECDSA_SK_CERT;
2803: break;
1.1 djm 2804: #endif /* WITH_OPENSSL */
1.90 markus 2805: case KEY_ED25519_SK:
2806: newtype = KEY_ED25519_SK_CERT;
2807: break;
1.1 djm 2808: case KEY_ED25519:
2809: newtype = KEY_ED25519_CERT;
2810: break;
1.62 markus 2811: #ifdef WITH_XMSS
2812: case KEY_XMSS:
2813: newtype = KEY_XMSS_CERT;
2814: break;
2815: #endif /* WITH_XMSS */
1.1 djm 2816: default:
2817: return SSH_ERR_INVALID_ARGUMENT;
2818: }
2819: if ((k->cert = cert_new()) == NULL)
2820: return SSH_ERR_ALLOC_FAIL;
2821: k->type = newtype;
2822: return 0;
2823: }
2824:
2825: /* Convert a certificate to its raw key equivalent */
2826: int
2827: sshkey_drop_cert(struct sshkey *k)
2828: {
2829: if (!sshkey_type_is_cert(k->type))
2830: return SSH_ERR_KEY_TYPE_UNKNOWN;
2831: cert_free(k->cert);
2832: k->cert = NULL;
2833: k->type = sshkey_type_plain(k->type);
2834: return 0;
2835: }
2836:
2837: /* Sign a certified key, (re-)generating the signed certblob. */
2838: int
1.53 djm 2839: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.86 djm 2840: const char *sk_provider, sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2841: {
2842: struct sshbuf *principals = NULL;
2843: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2844: size_t i, ca_len, sig_len;
2845: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2846: struct sshbuf *cert = NULL;
2847: char *sigtype = NULL;
1.69 djm 2848: #ifdef WITH_OPENSSL
2849: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2850: #endif /* WITH_OPENSSL */
1.1 djm 2851:
2852: if (k == NULL || k->cert == NULL ||
2853: k->cert->certblob == NULL || ca == NULL)
2854: return SSH_ERR_INVALID_ARGUMENT;
2855: if (!sshkey_is_cert(k))
2856: return SSH_ERR_KEY_TYPE_UNKNOWN;
2857: if (!sshkey_type_is_valid_ca(ca->type))
2858: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2859:
1.67 djm 2860: /*
2861: * If no alg specified as argument but a signature_type was set,
2862: * then prefer that. If both were specified, then they must match.
2863: */
2864: if (alg == NULL)
2865: alg = k->cert->signature_type;
2866: else if (k->cert->signature_type != NULL &&
2867: strcmp(alg, k->cert->signature_type) != 0)
2868: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2869:
2870: /*
2871: * If no signing algorithm or signature_type was specified and we're
2872: * using a RSA key, then default to a good signature algorithm.
2873: */
2874: if (alg == NULL && ca->type == KEY_RSA)
2875: alg = "rsa-sha2-512";
1.67 djm 2876:
1.1 djm 2877: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2878: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2879:
2880: cert = k->cert->certblob; /* for readability */
2881: sshbuf_reset(cert);
2882: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2883: goto out;
2884:
2885: /* -v01 certs put nonce first */
2886: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2887: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2888: goto out;
1.1 djm 2889:
2890: /* XXX this substantially duplicates to_blob(); refactor */
2891: switch (k->type) {
2892: #ifdef WITH_OPENSSL
2893: case KEY_DSA_CERT:
1.69 djm 2894: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2895: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2896: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2897: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2898: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2899: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2900: goto out;
2901: break;
2902: case KEY_ECDSA_CERT:
1.85 djm 2903: case KEY_ECDSA_SK_CERT:
1.1 djm 2904: if ((ret = sshbuf_put_cstring(cert,
2905: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2906: (ret = sshbuf_put_ec(cert,
2907: EC_KEY_get0_public_key(k->ecdsa),
2908: EC_KEY_get0_group(k->ecdsa))) != 0)
2909: goto out;
1.85 djm 2910: if (k->type == KEY_ECDSA_SK_CERT) {
2911: if ((ret = sshbuf_put_cstring(cert,
2912: k->sk_application)) != 0)
2913: goto out;
2914: }
1.1 djm 2915: break;
2916: case KEY_RSA_CERT:
1.69 djm 2917: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2918: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2919: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2920: goto out;
2921: break;
2922: #endif /* WITH_OPENSSL */
2923: case KEY_ED25519_CERT:
1.94 ! djm 2924: case KEY_ED25519_SK_CERT:
1.1 djm 2925: if ((ret = sshbuf_put_string(cert,
2926: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2927: goto out;
1.94 ! djm 2928: if (k->type == KEY_ED25519_SK_CERT) {
! 2929: if ((ret = sshbuf_put_cstring(cert,
! 2930: k->sk_application)) != 0)
! 2931: goto out;
! 2932: }
1.1 djm 2933: break;
1.62 markus 2934: #ifdef WITH_XMSS
2935: case KEY_XMSS_CERT:
2936: if (k->xmss_name == NULL) {
2937: ret = SSH_ERR_INVALID_ARGUMENT;
2938: goto out;
2939: }
2940: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2941: (ret = sshbuf_put_string(cert,
2942: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2943: goto out;
2944: break;
2945: #endif /* WITH_XMSS */
1.1 djm 2946: default:
2947: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2948: goto out;
1.1 djm 2949: }
2950:
1.20 djm 2951: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2952: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2953: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2954: goto out;
2955:
2956: if ((principals = sshbuf_new()) == NULL) {
2957: ret = SSH_ERR_ALLOC_FAIL;
2958: goto out;
2959: }
2960: for (i = 0; i < k->cert->nprincipals; i++) {
2961: if ((ret = sshbuf_put_cstring(principals,
2962: k->cert->principals[i])) != 0)
2963: goto out;
2964: }
2965: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2966: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2967: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2968: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2969: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2970: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2971: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2972: goto out;
2973:
2974: /* Sign the whole mess */
1.53 djm 2975: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.86 djm 2976: sshbuf_len(cert), alg, sk_provider, 0, signer_ctx)) != 0)
1.1 djm 2977: goto out;
1.67 djm 2978: /* Check and update signature_type against what was actually used */
1.82 djm 2979: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2980: goto out;
2981: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2982: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2983: goto out;
2984: }
2985: if (k->cert->signature_type == NULL) {
2986: k->cert->signature_type = sigtype;
2987: sigtype = NULL;
2988: }
1.1 djm 2989: /* Append signature and we are done */
2990: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2991: goto out;
2992: ret = 0;
2993: out:
2994: if (ret != 0)
2995: sshbuf_reset(cert);
1.29 mmcc 2996: free(sig_blob);
2997: free(ca_blob);
1.67 djm 2998: free(sigtype);
1.31 mmcc 2999: sshbuf_free(principals);
1.1 djm 3000: return ret;
1.53 djm 3001: }
3002:
3003: static int
1.76 djm 3004: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 3005: const u_char *data, size_t datalen,
1.86 djm 3006: const char *alg, const char *sk_provider, u_int compat, void *ctx)
1.53 djm 3007: {
3008: if (ctx != NULL)
3009: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 3010: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
3011: sk_provider, compat);
1.53 djm 3012: }
3013:
3014: int
1.86 djm 3015: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
3016: const char *sk_provider)
1.53 djm 3017: {
1.86 djm 3018: return sshkey_certify_custom(k, ca, alg, sk_provider,
3019: default_key_sign, NULL);
1.1 djm 3020: }
3021:
3022: int
3023: sshkey_cert_check_authority(const struct sshkey *k,
3024: int want_host, int require_principal,
3025: const char *name, const char **reason)
3026: {
3027: u_int i, principal_matches;
3028: time_t now = time(NULL);
3029:
3030: if (reason != NULL)
3031: *reason = NULL;
3032:
3033: if (want_host) {
3034: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
3035: *reason = "Certificate invalid: not a host certificate";
3036: return SSH_ERR_KEY_CERT_INVALID;
3037: }
3038: } else {
3039: if (k->cert->type != SSH2_CERT_TYPE_USER) {
3040: *reason = "Certificate invalid: not a user certificate";
3041: return SSH_ERR_KEY_CERT_INVALID;
3042: }
3043: }
3044: if (now < 0) {
3045: /* yikes - system clock before epoch! */
3046: *reason = "Certificate invalid: not yet valid";
3047: return SSH_ERR_KEY_CERT_INVALID;
3048: }
3049: if ((u_int64_t)now < k->cert->valid_after) {
3050: *reason = "Certificate invalid: not yet valid";
3051: return SSH_ERR_KEY_CERT_INVALID;
3052: }
3053: if ((u_int64_t)now >= k->cert->valid_before) {
3054: *reason = "Certificate invalid: expired";
3055: return SSH_ERR_KEY_CERT_INVALID;
3056: }
3057: if (k->cert->nprincipals == 0) {
3058: if (require_principal) {
3059: *reason = "Certificate lacks principal list";
3060: return SSH_ERR_KEY_CERT_INVALID;
3061: }
3062: } else if (name != NULL) {
3063: principal_matches = 0;
3064: for (i = 0; i < k->cert->nprincipals; i++) {
3065: if (strcmp(name, k->cert->principals[i]) == 0) {
3066: principal_matches = 1;
3067: break;
3068: }
3069: }
3070: if (!principal_matches) {
3071: *reason = "Certificate invalid: name is not a listed "
3072: "principal";
3073: return SSH_ERR_KEY_CERT_INVALID;
3074: }
3075: }
3076: return 0;
1.27 djm 3077: }
3078:
3079: size_t
3080: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
3081: {
3082: char from[32], to[32], ret[64];
3083: time_t tt;
3084: struct tm *tm;
3085:
3086: *from = *to = '\0';
3087: if (cert->valid_after == 0 &&
3088: cert->valid_before == 0xffffffffffffffffULL)
3089: return strlcpy(s, "forever", l);
3090:
3091: if (cert->valid_after != 0) {
3092: /* XXX revisit INT_MAX in 2038 :) */
3093: tt = cert->valid_after > INT_MAX ?
3094: INT_MAX : cert->valid_after;
3095: tm = localtime(&tt);
3096: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
3097: }
3098: if (cert->valid_before != 0xffffffffffffffffULL) {
3099: /* XXX revisit INT_MAX in 2038 :) */
3100: tt = cert->valid_before > INT_MAX ?
3101: INT_MAX : cert->valid_before;
3102: tm = localtime(&tt);
3103: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
3104: }
3105:
3106: if (cert->valid_after == 0)
3107: snprintf(ret, sizeof(ret), "before %s", to);
3108: else if (cert->valid_before == 0xffffffffffffffffULL)
3109: snprintf(ret, sizeof(ret), "after %s", from);
3110: else
3111: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
3112:
3113: return strlcpy(s, ret, l);
1.1 djm 3114: }
3115:
3116: int
1.76 djm 3117: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 3118: enum sshkey_serialize_rep opts)
1.1 djm 3119: {
3120: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 3121: int was_shielded = sshkey_is_shielded(key);
3122: struct sshbuf *b = NULL;
1.69 djm 3123: #ifdef WITH_OPENSSL
3124: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
3125: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
3126: #endif /* WITH_OPENSSL */
1.1 djm 3127:
1.76 djm 3128: if ((r = sshkey_unshield_private(key)) != 0)
3129: return r;
3130: if ((b = sshbuf_new()) == NULL)
3131: return SSH_ERR_ALLOC_FAIL;
1.1 djm 3132: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
3133: goto out;
3134: switch (key->type) {
3135: #ifdef WITH_OPENSSL
3136: case KEY_RSA:
1.69 djm 3137: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
3138: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3139: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
3140: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
3141: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
3142: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3143: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3144: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3145: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3146: goto out;
3147: break;
3148: case KEY_RSA_CERT:
3149: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3150: r = SSH_ERR_INVALID_ARGUMENT;
3151: goto out;
3152: }
1.69 djm 3153: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
3154: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3155: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 3156: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3157: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3158: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3159: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3160: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3161: goto out;
3162: break;
3163: case KEY_DSA:
1.69 djm 3164: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
3165: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
3166: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
3167: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
3168: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
3169: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3170: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3171: goto out;
3172: break;
3173: case KEY_DSA_CERT:
3174: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3175: r = SSH_ERR_INVALID_ARGUMENT;
3176: goto out;
3177: }
1.69 djm 3178: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3179: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3180: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3181: goto out;
3182: break;
3183: case KEY_ECDSA:
3184: if ((r = sshbuf_put_cstring(b,
3185: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3186: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3187: (r = sshbuf_put_bignum2(b,
3188: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3189: goto out;
3190: break;
3191: case KEY_ECDSA_CERT:
3192: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3193: r = SSH_ERR_INVALID_ARGUMENT;
3194: goto out;
3195: }
3196: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3197: (r = sshbuf_put_bignum2(b,
3198: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3199: goto out;
3200: break;
1.85 djm 3201: case KEY_ECDSA_SK:
3202: if ((r = sshbuf_put_cstring(b,
3203: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3204: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3205: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3206: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3207: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3208: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3209: goto out;
3210: break;
3211: case KEY_ECDSA_SK_CERT:
3212: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3213: r = SSH_ERR_INVALID_ARGUMENT;
3214: goto out;
3215: }
3216: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3217: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3218: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3219: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3220: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3221: goto out;
3222: break;
1.1 djm 3223: #endif /* WITH_OPENSSL */
3224: case KEY_ED25519:
3225: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3226: ED25519_PK_SZ)) != 0 ||
3227: (r = sshbuf_put_string(b, key->ed25519_sk,
3228: ED25519_SK_SZ)) != 0)
3229: goto out;
3230: break;
3231: case KEY_ED25519_CERT:
3232: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3233: r = SSH_ERR_INVALID_ARGUMENT;
3234: goto out;
3235: }
3236: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3237: (r = sshbuf_put_string(b, key->ed25519_pk,
3238: ED25519_PK_SZ)) != 0 ||
3239: (r = sshbuf_put_string(b, key->ed25519_sk,
3240: ED25519_SK_SZ)) != 0)
3241: goto out;
3242: break;
1.90 markus 3243: case KEY_ED25519_SK:
3244: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3245: ED25519_PK_SZ)) != 0 ||
3246: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3247: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3248: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3249: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3250: goto out;
3251: break;
3252: case KEY_ED25519_SK_CERT:
3253: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3254: r = SSH_ERR_INVALID_ARGUMENT;
3255: goto out;
3256: }
3257: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3258: (r = sshbuf_put_string(b, key->ed25519_pk,
3259: ED25519_PK_SZ)) != 0 ||
3260: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3261: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3262: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3263: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3264: goto out;
3265: break;
1.62 markus 3266: #ifdef WITH_XMSS
3267: case KEY_XMSS:
3268: if (key->xmss_name == NULL) {
3269: r = SSH_ERR_INVALID_ARGUMENT;
3270: goto out;
3271: }
3272: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3273: (r = sshbuf_put_string(b, key->xmss_pk,
3274: sshkey_xmss_pklen(key))) != 0 ||
3275: (r = sshbuf_put_string(b, key->xmss_sk,
3276: sshkey_xmss_sklen(key))) != 0 ||
3277: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3278: goto out;
3279: break;
3280: case KEY_XMSS_CERT:
3281: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3282: key->xmss_name == NULL) {
3283: r = SSH_ERR_INVALID_ARGUMENT;
3284: goto out;
3285: }
3286: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3287: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3288: (r = sshbuf_put_string(b, key->xmss_pk,
3289: sshkey_xmss_pklen(key))) != 0 ||
3290: (r = sshbuf_put_string(b, key->xmss_sk,
3291: sshkey_xmss_sklen(key))) != 0 ||
3292: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3293: goto out;
3294: break;
3295: #endif /* WITH_XMSS */
1.1 djm 3296: default:
3297: r = SSH_ERR_INVALID_ARGUMENT;
3298: goto out;
3299: }
1.76 djm 3300: /*
3301: * success (but we still need to append the output to buf after
3302: * possibly re-shielding the private key)
3303: */
1.1 djm 3304: r = 0;
3305: out:
1.76 djm 3306: if (was_shielded)
3307: r = sshkey_shield_private(key);
3308: if (r == 0)
3309: r = sshbuf_putb(buf, b);
3310: sshbuf_free(b);
3311:
1.1 djm 3312: return r;
3313: }
3314:
3315: int
1.76 djm 3316: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3317: {
3318: return sshkey_private_serialize_opt(key, b,
3319: SSHKEY_SERIALIZE_DEFAULT);
3320: }
3321:
3322: int
1.1 djm 3323: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3324: {
1.62 markus 3325: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3326: struct sshkey *k = NULL;
1.14 djm 3327: size_t pklen = 0, sklen = 0;
1.1 djm 3328: int type, r = SSH_ERR_INTERNAL_ERROR;
3329: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3330: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3331: #ifdef WITH_OPENSSL
3332: BIGNUM *exponent = NULL;
1.69 djm 3333: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3334: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3335: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3336: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3337: #endif /* WITH_OPENSSL */
3338:
3339: if (kp != NULL)
3340: *kp = NULL;
3341: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3342: goto out;
3343: type = sshkey_type_from_name(tname);
3344: switch (type) {
3345: #ifdef WITH_OPENSSL
3346: case KEY_DSA:
1.70 djm 3347: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3348: r = SSH_ERR_ALLOC_FAIL;
3349: goto out;
3350: }
1.73 djm 3351: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3352: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3353: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3354: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3355: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3356: goto out;
3357: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3358: r = SSH_ERR_LIBCRYPTO_ERROR;
3359: goto out;
3360: }
3361: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3362: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3363: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3364: goto out;
1.69 djm 3365: }
3366: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3367: break;
3368: case KEY_DSA_CERT:
1.14 djm 3369: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3370: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3371: goto out;
1.84 djm 3372: if (k->type != type) {
3373: r = SSH_ERR_INVALID_FORMAT;
3374: goto out;
3375: }
1.69 djm 3376: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3377: r = SSH_ERR_LIBCRYPTO_ERROR;
3378: goto out;
3379: }
3380: dsa_priv_key = NULL; /* transferred */
1.1 djm 3381: break;
3382: case KEY_ECDSA:
1.70 djm 3383: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3384: r = SSH_ERR_ALLOC_FAIL;
3385: goto out;
3386: }
3387: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3388: r = SSH_ERR_INVALID_ARGUMENT;
3389: goto out;
3390: }
3391: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3392: goto out;
3393: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3394: r = SSH_ERR_EC_CURVE_MISMATCH;
3395: goto out;
3396: }
3397: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3398: if (k->ecdsa == NULL) {
1.1 djm 3399: r = SSH_ERR_LIBCRYPTO_ERROR;
3400: goto out;
3401: }
3402: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3403: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3404: goto out;
3405: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3406: r = SSH_ERR_LIBCRYPTO_ERROR;
3407: goto out;
3408: }
3409: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3410: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3411: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3412: goto out;
3413: break;
3414: case KEY_ECDSA_CERT:
1.14 djm 3415: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3416: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3417: goto out;
1.84 djm 3418: if (k->type != type ||
3419: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
3420: r = SSH_ERR_INVALID_FORMAT;
3421: goto out;
3422: }
1.1 djm 3423: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3424: r = SSH_ERR_LIBCRYPTO_ERROR;
3425: goto out;
3426: }
3427: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3428: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3429: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3430: goto out;
3431: break;
1.85 djm 3432: case KEY_ECDSA_SK:
3433: if ((k = sshkey_new(type)) == NULL) {
3434: r = SSH_ERR_ALLOC_FAIL;
3435: goto out;
3436: }
3437: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3438: r = SSH_ERR_INVALID_ARGUMENT;
3439: goto out;
3440: }
3441: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3442: goto out;
3443: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3444: r = SSH_ERR_EC_CURVE_MISMATCH;
3445: goto out;
3446: }
3447: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3448: (k->sk_reserved = sshbuf_new()) == NULL) {
3449: r = SSH_ERR_ALLOC_FAIL;
3450: goto out;
3451: }
3452: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3453: if (k->ecdsa == NULL) {
3454: r = SSH_ERR_LIBCRYPTO_ERROR;
3455: goto out;
3456: }
3457: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3458: (r = sshbuf_get_cstring(buf, &k->sk_application,
3459: NULL)) != 0 ||
3460: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3461: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3462: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3463: goto out;
3464: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3465: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3466: goto out;
3467: break;
3468: case KEY_ECDSA_SK_CERT:
3469: if ((r = sshkey_froms(buf, &k)) != 0)
3470: goto out;
3471: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3472: (k->sk_reserved = sshbuf_new()) == NULL) {
3473: r = SSH_ERR_ALLOC_FAIL;
3474: goto out;
3475: }
3476: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3477: NULL)) != 0 ||
3478: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3479: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3480: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3481: goto out;
3482: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3483: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3484: goto out;
3485: break;
1.1 djm 3486: case KEY_RSA:
1.70 djm 3487: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3488: r = SSH_ERR_ALLOC_FAIL;
3489: goto out;
3490: }
1.73 djm 3491: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3492: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3493: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3494: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3495: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3496: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3497: goto out;
1.69 djm 3498: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3499: r = SSH_ERR_LIBCRYPTO_ERROR;
3500: goto out;
3501: }
3502: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3503: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3504: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3505: goto out;
3506: }
1.69 djm 3507: rsa_p = rsa_q = NULL; /* transferred */
3508: if ((r = check_rsa_length(k->rsa)) != 0)
3509: goto out;
3510: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3511: goto out;
1.1 djm 3512: break;
3513: case KEY_RSA_CERT:
1.14 djm 3514: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3515: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3516: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3517: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3518: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3519: goto out;
1.84 djm 3520: if (k->type != type) {
3521: r = SSH_ERR_INVALID_FORMAT;
3522: goto out;
3523: }
1.69 djm 3524: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3525: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3526: goto out;
3527: }
1.69 djm 3528: rsa_d = NULL; /* transferred */
3529: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3530: r = SSH_ERR_LIBCRYPTO_ERROR;
3531: goto out;
3532: }
3533: rsa_p = rsa_q = NULL; /* transferred */
3534: if ((r = check_rsa_length(k->rsa)) != 0)
3535: goto out;
3536: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3537: goto out;
1.1 djm 3538: break;
3539: #endif /* WITH_OPENSSL */
3540: case KEY_ED25519:
1.70 djm 3541: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3542: r = SSH_ERR_ALLOC_FAIL;
3543: goto out;
3544: }
3545: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3546: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3547: goto out;
3548: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3549: r = SSH_ERR_INVALID_FORMAT;
3550: goto out;
3551: }
3552: k->ed25519_pk = ed25519_pk;
3553: k->ed25519_sk = ed25519_sk;
3554: ed25519_pk = ed25519_sk = NULL;
3555: break;
3556: case KEY_ED25519_CERT:
1.14 djm 3557: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3558: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3559: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3560: goto out;
1.84 djm 3561: if (k->type != type) {
3562: r = SSH_ERR_INVALID_FORMAT;
3563: goto out;
3564: }
1.1 djm 3565: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3566: r = SSH_ERR_INVALID_FORMAT;
3567: goto out;
3568: }
3569: k->ed25519_pk = ed25519_pk;
3570: k->ed25519_sk = ed25519_sk;
1.84 djm 3571: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3572: break;
1.90 markus 3573: case KEY_ED25519_SK:
3574: if ((k = sshkey_new(type)) == NULL) {
3575: r = SSH_ERR_ALLOC_FAIL;
3576: goto out;
3577: }
3578: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3579: goto out;
3580: if (pklen != ED25519_PK_SZ) {
3581: r = SSH_ERR_INVALID_FORMAT;
3582: goto out;
3583: }
3584: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3585: (k->sk_reserved = sshbuf_new()) == NULL) {
3586: r = SSH_ERR_ALLOC_FAIL;
3587: goto out;
3588: }
3589: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3590: NULL)) != 0 ||
3591: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3592: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3593: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3594: goto out;
3595: k->ed25519_pk = ed25519_pk;
3596: ed25519_pk = NULL;
3597: break;
3598: case KEY_ED25519_SK_CERT:
3599: if ((r = sshkey_froms(buf, &k)) != 0 ||
3600: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3601: goto out;
3602: if (k->type != type) {
3603: r = SSH_ERR_INVALID_FORMAT;
3604: goto out;
3605: }
3606: if (pklen != ED25519_PK_SZ) {
3607: r = SSH_ERR_INVALID_FORMAT;
3608: goto out;
3609: }
3610: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3611: (k->sk_reserved = sshbuf_new()) == NULL) {
3612: r = SSH_ERR_ALLOC_FAIL;
3613: goto out;
3614: }
3615: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3616: NULL)) != 0 ||
3617: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3618: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3619: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3620: goto out;
3621: k->ed25519_pk = ed25519_pk;
3622: ed25519_pk = NULL; /* transferred */
3623: break;
1.62 markus 3624: #ifdef WITH_XMSS
3625: case KEY_XMSS:
1.70 djm 3626: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3627: r = SSH_ERR_ALLOC_FAIL;
3628: goto out;
3629: }
3630: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3631: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3632: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3633: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3634: goto out;
3635: if (pklen != sshkey_xmss_pklen(k) ||
3636: sklen != sshkey_xmss_sklen(k)) {
3637: r = SSH_ERR_INVALID_FORMAT;
3638: goto out;
3639: }
3640: k->xmss_pk = xmss_pk;
3641: k->xmss_sk = xmss_sk;
3642: xmss_pk = xmss_sk = NULL;
3643: /* optional internal state */
3644: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3645: goto out;
3646: break;
3647: case KEY_XMSS_CERT:
3648: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3649: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3650: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3651: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3652: goto out;
1.84 djm 3653: if (k->type != type || strcmp(xmss_name, k->xmss_name) != 0) {
1.64 markus 3654: r = SSH_ERR_INVALID_FORMAT;
3655: goto out;
3656: }
1.62 markus 3657: if (pklen != sshkey_xmss_pklen(k) ||
3658: sklen != sshkey_xmss_sklen(k)) {
3659: r = SSH_ERR_INVALID_FORMAT;
3660: goto out;
3661: }
3662: k->xmss_pk = xmss_pk;
3663: k->xmss_sk = xmss_sk;
3664: xmss_pk = xmss_sk = NULL;
3665: /* optional internal state */
3666: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3667: goto out;
3668: break;
3669: #endif /* WITH_XMSS */
1.1 djm 3670: default:
3671: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3672: goto out;
3673: }
3674: #ifdef WITH_OPENSSL
3675: /* enable blinding */
3676: switch (k->type) {
3677: case KEY_RSA:
3678: case KEY_RSA_CERT:
3679: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3680: r = SSH_ERR_LIBCRYPTO_ERROR;
3681: goto out;
3682: }
3683: break;
3684: }
3685: #endif /* WITH_OPENSSL */
3686: /* success */
3687: r = 0;
3688: if (kp != NULL) {
3689: *kp = k;
3690: k = NULL;
3691: }
3692: out:
3693: free(tname);
3694: free(curve);
3695: #ifdef WITH_OPENSSL
1.60 jsing 3696: BN_clear_free(exponent);
1.69 djm 3697: BN_clear_free(dsa_p);
3698: BN_clear_free(dsa_q);
3699: BN_clear_free(dsa_g);
3700: BN_clear_free(dsa_pub_key);
3701: BN_clear_free(dsa_priv_key);
3702: BN_clear_free(rsa_n);
3703: BN_clear_free(rsa_e);
3704: BN_clear_free(rsa_d);
3705: BN_clear_free(rsa_p);
3706: BN_clear_free(rsa_q);
3707: BN_clear_free(rsa_iqmp);
1.1 djm 3708: #endif /* WITH_OPENSSL */
3709: sshkey_free(k);
1.61 jsing 3710: freezero(ed25519_pk, pklen);
3711: freezero(ed25519_sk, sklen);
1.62 markus 3712: free(xmss_name);
3713: freezero(xmss_pk, pklen);
3714: freezero(xmss_sk, sklen);
1.1 djm 3715: return r;
3716: }
3717:
3718: #ifdef WITH_OPENSSL
3719: int
3720: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3721: {
3722: EC_POINT *nq = NULL;
1.93 djm 3723: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 3724: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3725:
3726: /*
3727: * NB. This assumes OpenSSL has already verified that the public
3728: * point lies on the curve. This is done by EC_POINT_oct2point()
3729: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3730: * reachable with public points not unmarshalled using
3731: * EC_POINT_oct2point then the caller will need to explicitly check.
3732: */
1.1 djm 3733:
3734: /*
3735: * We shouldn't ever hit this case because bignum_get_ecpoint()
3736: * refuses to load GF2m points.
3737: */
3738: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3739: NID_X9_62_prime_field)
3740: goto out;
3741:
3742: /* Q != infinity */
3743: if (EC_POINT_is_at_infinity(group, public))
3744: goto out;
3745:
1.93 djm 3746: if ((x = BN_new()) == NULL ||
3747: (y = BN_new()) == NULL ||
3748: (order = BN_new()) == NULL ||
3749: (tmp = BN_new()) == NULL) {
1.1 djm 3750: ret = SSH_ERR_ALLOC_FAIL;
3751: goto out;
3752: }
3753:
3754: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 3755: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 3756: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 3757: x, y, NULL) != 1) {
1.1 djm 3758: ret = SSH_ERR_LIBCRYPTO_ERROR;
3759: goto out;
3760: }
3761: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3762: BN_num_bits(y) <= BN_num_bits(order) / 2)
3763: goto out;
3764:
3765: /* nQ == infinity (n == order of subgroup) */
3766: if ((nq = EC_POINT_new(group)) == NULL) {
3767: ret = SSH_ERR_ALLOC_FAIL;
3768: goto out;
3769: }
1.93 djm 3770: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 3771: ret = SSH_ERR_LIBCRYPTO_ERROR;
3772: goto out;
3773: }
3774: if (EC_POINT_is_at_infinity(group, nq) != 1)
3775: goto out;
3776:
3777: /* x < order - 1, y < order - 1 */
3778: if (!BN_sub(tmp, order, BN_value_one())) {
3779: ret = SSH_ERR_LIBCRYPTO_ERROR;
3780: goto out;
3781: }
3782: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3783: goto out;
3784: ret = 0;
3785: out:
1.93 djm 3786: BN_clear_free(x);
3787: BN_clear_free(y);
3788: BN_clear_free(order);
3789: BN_clear_free(tmp);
1.60 jsing 3790: EC_POINT_free(nq);
1.1 djm 3791: return ret;
3792: }
3793:
3794: int
3795: sshkey_ec_validate_private(const EC_KEY *key)
3796: {
1.93 djm 3797: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3798: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3799:
1.93 djm 3800: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3801: ret = SSH_ERR_ALLOC_FAIL;
3802: goto out;
3803: }
3804:
3805: /* log2(private) > log2(order)/2 */
1.93 djm 3806: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3807: ret = SSH_ERR_LIBCRYPTO_ERROR;
3808: goto out;
3809: }
3810: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3811: BN_num_bits(order) / 2)
3812: goto out;
3813:
3814: /* private < order - 1 */
3815: if (!BN_sub(tmp, order, BN_value_one())) {
3816: ret = SSH_ERR_LIBCRYPTO_ERROR;
3817: goto out;
3818: }
3819: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3820: goto out;
3821: ret = 0;
3822: out:
1.93 djm 3823: BN_clear_free(order);
3824: BN_clear_free(tmp);
1.1 djm 3825: return ret;
3826: }
3827:
3828: void
3829: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3830: {
1.93 djm 3831: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3832:
3833: if (point == NULL) {
3834: fputs("point=(NULL)\n", stderr);
3835: return;
3836: }
1.93 djm 3837: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3838: fprintf(stderr, "%s: BN_new failed\n", __func__);
3839: goto out;
1.1 djm 3840: }
3841: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3842: NID_X9_62_prime_field) {
3843: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3844: goto out;
1.1 djm 3845: }
1.93 djm 3846: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3847: x, y, NULL) != 1) {
1.1 djm 3848: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3849: __func__);
1.93 djm 3850: goto out;
1.1 djm 3851: }
3852: fputs("x=", stderr);
3853: BN_print_fp(stderr, x);
3854: fputs("\ny=", stderr);
3855: BN_print_fp(stderr, y);
3856: fputs("\n", stderr);
1.93 djm 3857: out:
3858: BN_clear_free(x);
3859: BN_clear_free(y);
1.1 djm 3860: }
3861:
3862: void
3863: sshkey_dump_ec_key(const EC_KEY *key)
3864: {
3865: const BIGNUM *exponent;
3866:
3867: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3868: EC_KEY_get0_public_key(key));
3869: fputs("exponent=", stderr);
3870: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3871: fputs("(NULL)", stderr);
3872: else
3873: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3874: fputs("\n", stderr);
3875: }
3876: #endif /* WITH_OPENSSL */
3877:
3878: static int
1.76 djm 3879: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3880: const char *passphrase, const char *comment, const char *ciphername,
3881: int rounds)
3882: {
1.4 djm 3883: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3884: u_char salt[SALT_LEN];
1.4 djm 3885: char *b64 = NULL;
1.1 djm 3886: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3887: u_int check;
3888: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3889: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3890: const struct sshcipher *cipher;
3891: const char *kdfname = KDFNAME;
3892: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3893:
3894: if (rounds <= 0)
3895: rounds = DEFAULT_ROUNDS;
3896: if (passphrase == NULL || !strlen(passphrase)) {
3897: ciphername = "none";
3898: kdfname = "none";
3899: } else if (ciphername == NULL)
3900: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3901: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3902: r = SSH_ERR_INVALID_ARGUMENT;
3903: goto out;
3904: }
3905:
3906: if ((kdf = sshbuf_new()) == NULL ||
3907: (encoded = sshbuf_new()) == NULL ||
3908: (encrypted = sshbuf_new()) == NULL) {
3909: r = SSH_ERR_ALLOC_FAIL;
3910: goto out;
3911: }
3912: blocksize = cipher_blocksize(cipher);
3913: keylen = cipher_keylen(cipher);
3914: ivlen = cipher_ivlen(cipher);
3915: authlen = cipher_authlen(cipher);
3916: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3917: r = SSH_ERR_ALLOC_FAIL;
3918: goto out;
3919: }
3920: if (strcmp(kdfname, "bcrypt") == 0) {
3921: arc4random_buf(salt, SALT_LEN);
3922: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3923: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3924: r = SSH_ERR_INVALID_ARGUMENT;
3925: goto out;
3926: }
3927: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3928: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3929: goto out;
3930: } else if (strcmp(kdfname, "none") != 0) {
3931: /* Unsupported KDF type */
3932: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3933: goto out;
3934: }
3935: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3936: key + keylen, ivlen, 1)) != 0)
3937: goto out;
3938:
3939: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3940: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3941: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3942: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3943: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3944: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3945: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3946: goto out;
3947:
3948: /* set up the buffer that will be encrypted */
3949:
3950: /* Random check bytes */
3951: check = arc4random();
3952: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3953: (r = sshbuf_put_u32(encrypted, check)) != 0)
3954: goto out;
3955:
3956: /* append private key and comment*/
1.62 markus 3957: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3958: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3959: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3960: goto out;
3961:
3962: /* padding */
3963: i = 0;
3964: while (sshbuf_len(encrypted) % blocksize) {
3965: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3966: goto out;
3967: }
3968:
3969: /* length in destination buffer */
3970: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3971: goto out;
3972:
3973: /* encrypt */
3974: if ((r = sshbuf_reserve(encoded,
3975: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3976: goto out;
1.36 djm 3977: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3978: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3979: goto out;
3980:
1.81 djm 3981: sshbuf_reset(blob);
1.1 djm 3982:
1.81 djm 3983: /* assemble uuencoded key */
3984: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3985: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3986: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3987: goto out;
3988:
3989: /* success */
3990: r = 0;
3991:
3992: out:
3993: sshbuf_free(kdf);
3994: sshbuf_free(encoded);
3995: sshbuf_free(encrypted);
1.36 djm 3996: cipher_free(ciphercontext);
1.1 djm 3997: explicit_bzero(salt, sizeof(salt));
3998: if (key != NULL) {
3999: explicit_bzero(key, keylen + ivlen);
4000: free(key);
4001: }
4002: if (pubkeyblob != NULL) {
4003: explicit_bzero(pubkeyblob, pubkeylen);
4004: free(pubkeyblob);
4005: }
4006: if (b64 != NULL) {
4007: explicit_bzero(b64, strlen(b64));
4008: free(b64);
4009: }
4010: return r;
4011: }
4012:
4013: static int
4014: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
4015: struct sshkey **keyp, char **commentp)
4016: {
4017: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
4018: const struct sshcipher *cipher = NULL;
4019: const u_char *cp;
4020: int r = SSH_ERR_INTERNAL_ERROR;
4021: size_t encoded_len;
1.18 djm 4022: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 4023: struct sshbuf *encoded = NULL, *decoded = NULL;
4024: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 4025: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 4026: struct sshkey *k = NULL;
4027: u_char *key = NULL, *salt = NULL, *dp, pad, last;
4028: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
4029:
4030: if (keyp != NULL)
4031: *keyp = NULL;
4032: if (commentp != NULL)
4033: *commentp = NULL;
4034:
4035: if ((encoded = sshbuf_new()) == NULL ||
4036: (decoded = sshbuf_new()) == NULL ||
4037: (decrypted = sshbuf_new()) == NULL) {
4038: r = SSH_ERR_ALLOC_FAIL;
4039: goto out;
4040: }
4041:
4042: /* check preamble */
4043: cp = sshbuf_ptr(blob);
4044: encoded_len = sshbuf_len(blob);
4045: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
4046: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
4047: r = SSH_ERR_INVALID_FORMAT;
4048: goto out;
4049: }
4050: cp += MARK_BEGIN_LEN;
4051: encoded_len -= MARK_BEGIN_LEN;
4052:
4053: /* Look for end marker, removing whitespace as we go */
4054: while (encoded_len > 0) {
4055: if (*cp != '\n' && *cp != '\r') {
4056: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
4057: goto out;
4058: }
4059: last = *cp;
4060: encoded_len--;
4061: cp++;
4062: if (last == '\n') {
4063: if (encoded_len >= MARK_END_LEN &&
4064: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
4065: /* \0 terminate */
4066: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
4067: goto out;
4068: break;
4069: }
4070: }
4071: }
4072: if (encoded_len == 0) {
4073: r = SSH_ERR_INVALID_FORMAT;
4074: goto out;
4075: }
4076:
4077: /* decode base64 */
1.4 djm 4078: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 4079: goto out;
4080:
4081: /* check magic */
4082: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
4083: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
4084: r = SSH_ERR_INVALID_FORMAT;
4085: goto out;
4086: }
4087: /* parse public portion of key */
4088: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
4089: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
4090: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
4091: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
4092: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
4093: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
4094: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
4095: goto out;
4096:
4097: if ((cipher = cipher_by_name(ciphername)) == NULL) {
4098: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4099: goto out;
4100: }
4101: if ((passphrase == NULL || strlen(passphrase) == 0) &&
4102: strcmp(ciphername, "none") != 0) {
4103: /* passphrase required */
4104: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4105: goto out;
4106: }
4107: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
4108: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4109: goto out;
4110: }
4111: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
4112: r = SSH_ERR_INVALID_FORMAT;
4113: goto out;
4114: }
4115: if (nkeys != 1) {
4116: /* XXX only one key supported */
4117: r = SSH_ERR_INVALID_FORMAT;
4118: goto out;
4119: }
4120:
4121: /* check size of encrypted key blob */
4122: blocksize = cipher_blocksize(cipher);
4123: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
4124: r = SSH_ERR_INVALID_FORMAT;
4125: goto out;
4126: }
4127:
4128: /* setup key */
4129: keylen = cipher_keylen(cipher);
4130: ivlen = cipher_ivlen(cipher);
1.18 djm 4131: authlen = cipher_authlen(cipher);
1.1 djm 4132: if ((key = calloc(1, keylen + ivlen)) == NULL) {
4133: r = SSH_ERR_ALLOC_FAIL;
4134: goto out;
4135: }
4136: if (strcmp(kdfname, "bcrypt") == 0) {
4137: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4138: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4139: goto out;
4140: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4141: key, keylen + ivlen, rounds) < 0) {
4142: r = SSH_ERR_INVALID_FORMAT;
4143: goto out;
4144: }
4145: }
4146:
1.18 djm 4147: /* check that an appropriate amount of auth data is present */
1.84 djm 4148: if (sshbuf_len(decoded) < authlen ||
4149: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4150: r = SSH_ERR_INVALID_FORMAT;
4151: goto out;
4152: }
4153:
1.1 djm 4154: /* decrypt private portion of key */
4155: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4156: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4157: key + keylen, ivlen, 0)) != 0)
4158: goto out;
1.36 djm 4159: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4160: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4161: /* an integrity error here indicates an incorrect passphrase */
4162: if (r == SSH_ERR_MAC_INVALID)
4163: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4164: goto out;
4165: }
1.18 djm 4166: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4167: goto out;
4168: /* there should be no trailing data */
4169: if (sshbuf_len(decoded) != 0) {
4170: r = SSH_ERR_INVALID_FORMAT;
4171: goto out;
4172: }
4173:
4174: /* check check bytes */
4175: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4176: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4177: goto out;
4178: if (check1 != check2) {
4179: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4180: goto out;
4181: }
4182:
4183: /* Load the private key and comment */
4184: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4185: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4186: goto out;
4187:
4188: /* Check deterministic padding */
4189: i = 0;
4190: while (sshbuf_len(decrypted)) {
4191: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
4192: goto out;
4193: if (pad != (++i & 0xff)) {
4194: r = SSH_ERR_INVALID_FORMAT;
4195: goto out;
4196: }
4197: }
4198:
4199: /* XXX decode pubkey and check against private */
4200:
4201: /* success */
4202: r = 0;
4203: if (keyp != NULL) {
4204: *keyp = k;
4205: k = NULL;
4206: }
4207: if (commentp != NULL) {
4208: *commentp = comment;
4209: comment = NULL;
4210: }
4211: out:
4212: pad = 0;
1.36 djm 4213: cipher_free(ciphercontext);
1.1 djm 4214: free(ciphername);
4215: free(kdfname);
4216: free(comment);
4217: if (salt != NULL) {
4218: explicit_bzero(salt, slen);
4219: free(salt);
4220: }
4221: if (key != NULL) {
4222: explicit_bzero(key, keylen + ivlen);
4223: free(key);
4224: }
4225: sshbuf_free(encoded);
4226: sshbuf_free(decoded);
4227: sshbuf_free(kdf);
4228: sshbuf_free(decrypted);
4229: sshkey_free(k);
4230: return r;
4231: }
4232:
4233:
4234: #ifdef WITH_OPENSSL
1.80 djm 4235: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4236: static int
1.80 djm 4237: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4238: int format, const char *_passphrase, const char *comment)
1.1 djm 4239: {
1.76 djm 4240: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4241: int success, r;
4242: int blen, len = strlen(_passphrase);
4243: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4244: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4245: char *bptr;
1.1 djm 4246: BIO *bio = NULL;
1.76 djm 4247: struct sshbuf *blob;
1.80 djm 4248: EVP_PKEY *pkey = NULL;
1.1 djm 4249:
4250: if (len > 0 && len <= 4)
4251: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4252: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4253: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4254: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4255: r = SSH_ERR_ALLOC_FAIL;
4256: goto out;
4257: }
4258: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4259: r = SSH_ERR_ALLOC_FAIL;
4260: goto out;
1.76 djm 4261: }
4262: if ((r = sshkey_unshield_private(key)) != 0)
4263: goto out;
1.1 djm 4264:
4265: switch (key->type) {
4266: case KEY_DSA:
1.80 djm 4267: if (format == SSHKEY_PRIVATE_PEM) {
4268: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4269: cipher, passphrase, len, NULL, NULL);
4270: } else {
4271: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4272: }
1.1 djm 4273: break;
4274: case KEY_ECDSA:
1.80 djm 4275: if (format == SSHKEY_PRIVATE_PEM) {
4276: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4277: cipher, passphrase, len, NULL, NULL);
4278: } else {
4279: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4280: }
1.1 djm 4281: break;
4282: case KEY_RSA:
1.80 djm 4283: if (format == SSHKEY_PRIVATE_PEM) {
4284: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4285: cipher, passphrase, len, NULL, NULL);
4286: } else {
4287: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4288: }
1.1 djm 4289: break;
4290: default:
4291: success = 0;
4292: break;
4293: }
4294: if (success == 0) {
4295: r = SSH_ERR_LIBCRYPTO_ERROR;
4296: goto out;
4297: }
1.80 djm 4298: if (format == SSHKEY_PRIVATE_PKCS8) {
4299: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4300: passphrase, len, NULL, NULL)) == 0) {
4301: r = SSH_ERR_LIBCRYPTO_ERROR;
4302: goto out;
4303: }
4304: }
1.1 djm 4305: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4306: r = SSH_ERR_INTERNAL_ERROR;
4307: goto out;
4308: }
4309: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4310: goto out;
4311: r = 0;
4312: out:
1.76 djm 4313: if (was_shielded)
4314: r = sshkey_shield_private(key);
4315: if (r == 0)
4316: r = sshbuf_putb(buf, blob);
1.80 djm 4317:
4318: EVP_PKEY_free(pkey);
1.76 djm 4319: sshbuf_free(blob);
1.1 djm 4320: BIO_free(bio);
4321: return r;
4322: }
4323: #endif /* WITH_OPENSSL */
4324:
4325: /* Serialise "key" to buffer "blob" */
4326: int
4327: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4328: const char *passphrase, const char *comment,
1.80 djm 4329: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4330: {
4331: switch (key->type) {
1.9 markus 4332: #ifdef WITH_OPENSSL
1.1 djm 4333: case KEY_DSA:
4334: case KEY_ECDSA:
4335: case KEY_RSA:
1.80 djm 4336: break; /* see below */
1.1 djm 4337: #endif /* WITH_OPENSSL */
4338: case KEY_ED25519:
1.90 markus 4339: case KEY_ED25519_SK:
1.62 markus 4340: #ifdef WITH_XMSS
4341: case KEY_XMSS:
4342: #endif /* WITH_XMSS */
1.85 djm 4343: #ifdef WITH_OPENSSL
4344: case KEY_ECDSA_SK:
4345: #endif /* WITH_OPENSSL */
1.1 djm 4346: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4347: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4348: default:
4349: return SSH_ERR_KEY_TYPE_UNKNOWN;
4350: }
1.80 djm 4351:
4352: #ifdef WITH_OPENSSL
4353: switch (format) {
4354: case SSHKEY_PRIVATE_OPENSSH:
4355: return sshkey_private_to_blob2(key, blob, passphrase,
4356: comment, openssh_format_cipher, openssh_format_rounds);
4357: case SSHKEY_PRIVATE_PEM:
4358: case SSHKEY_PRIVATE_PKCS8:
4359: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4360: format, passphrase, comment);
4361: default:
4362: return SSH_ERR_INVALID_ARGUMENT;
4363: }
4364: #endif /* WITH_OPENSSL */
1.1 djm 4365: }
4366:
4367: #ifdef WITH_OPENSSL
1.8 djm 4368: static int
1.52 djm 4369: translate_libcrypto_error(unsigned long pem_err)
4370: {
4371: int pem_reason = ERR_GET_REASON(pem_err);
4372:
4373: switch (ERR_GET_LIB(pem_err)) {
4374: case ERR_LIB_PEM:
4375: switch (pem_reason) {
4376: case PEM_R_BAD_PASSWORD_READ:
4377: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4378: case PEM_R_BAD_DECRYPT:
4379: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4380: default:
4381: return SSH_ERR_INVALID_FORMAT;
4382: }
4383: case ERR_LIB_EVP:
4384: switch (pem_reason) {
4385: case EVP_R_BAD_DECRYPT:
4386: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4387: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4388: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4389: #endif
1.52 djm 4390: case EVP_R_DECODE_ERROR:
4391: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4392: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4393: #endif
4394: return SSH_ERR_INVALID_FORMAT;
4395: default:
4396: return SSH_ERR_LIBCRYPTO_ERROR;
4397: }
4398: case ERR_LIB_ASN1:
4399: return SSH_ERR_INVALID_FORMAT;
4400: }
4401: return SSH_ERR_LIBCRYPTO_ERROR;
4402: }
4403:
4404: static void
4405: clear_libcrypto_errors(void)
4406: {
4407: while (ERR_get_error() != 0)
4408: ;
4409: }
4410:
4411: /*
4412: * Translate OpenSSL error codes to determine whether
4413: * passphrase is required/incorrect.
4414: */
4415: static int
4416: convert_libcrypto_error(void)
4417: {
4418: /*
4419: * Some password errors are reported at the beginning
4420: * of the error queue.
4421: */
4422: if (translate_libcrypto_error(ERR_peek_error()) ==
4423: SSH_ERR_KEY_WRONG_PASSPHRASE)
4424: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4425: return translate_libcrypto_error(ERR_peek_last_error());
4426: }
4427:
4428: static int
1.1 djm 4429: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4430: const char *passphrase, struct sshkey **keyp)
1.1 djm 4431: {
4432: EVP_PKEY *pk = NULL;
4433: struct sshkey *prv = NULL;
4434: BIO *bio = NULL;
4435: int r;
4436:
1.32 djm 4437: if (keyp != NULL)
4438: *keyp = NULL;
1.1 djm 4439:
4440: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4441: return SSH_ERR_ALLOC_FAIL;
4442: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4443: (int)sshbuf_len(blob)) {
4444: r = SSH_ERR_ALLOC_FAIL;
4445: goto out;
4446: }
4447:
1.52 djm 4448: clear_libcrypto_errors();
1.1 djm 4449: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4450: (char *)passphrase)) == NULL) {
1.71 djm 4451: /*
4452: * libcrypto may return various ASN.1 errors when attempting
4453: * to parse a key with an incorrect passphrase.
4454: * Treat all format errors as "incorrect passphrase" if a
4455: * passphrase was supplied.
4456: */
4457: if (passphrase != NULL && *passphrase != '\0')
4458: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4459: else
4460: r = convert_libcrypto_error();
1.1 djm 4461: goto out;
4462: }
1.69 djm 4463: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4464: (type == KEY_UNSPEC || type == KEY_RSA)) {
4465: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4466: r = SSH_ERR_ALLOC_FAIL;
4467: goto out;
4468: }
4469: prv->rsa = EVP_PKEY_get1_RSA(pk);
4470: prv->type = KEY_RSA;
4471: #ifdef DEBUG_PK
4472: RSA_print_fp(stderr, prv->rsa, 8);
4473: #endif
4474: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4475: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4476: goto out;
4477: }
1.69 djm 4478: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4479: goto out;
1.69 djm 4480: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4481: (type == KEY_UNSPEC || type == KEY_DSA)) {
4482: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4483: r = SSH_ERR_ALLOC_FAIL;
4484: goto out;
4485: }
4486: prv->dsa = EVP_PKEY_get1_DSA(pk);
4487: prv->type = KEY_DSA;
4488: #ifdef DEBUG_PK
4489: DSA_print_fp(stderr, prv->dsa, 8);
4490: #endif
1.69 djm 4491: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4492: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4493: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4494: r = SSH_ERR_ALLOC_FAIL;
4495: goto out;
4496: }
4497: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4498: prv->type = KEY_ECDSA;
4499: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4500: if (prv->ecdsa_nid == -1 ||
4501: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4502: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4503: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4504: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4505: r = SSH_ERR_INVALID_FORMAT;
4506: goto out;
4507: }
4508: #ifdef DEBUG_PK
4509: if (prv != NULL && prv->ecdsa != NULL)
4510: sshkey_dump_ec_key(prv->ecdsa);
4511: #endif
4512: } else {
4513: r = SSH_ERR_INVALID_FORMAT;
4514: goto out;
4515: }
4516: r = 0;
1.32 djm 4517: if (keyp != NULL) {
4518: *keyp = prv;
4519: prv = NULL;
4520: }
1.1 djm 4521: out:
4522: BIO_free(bio);
1.60 jsing 4523: EVP_PKEY_free(pk);
1.30 mmcc 4524: sshkey_free(prv);
1.1 djm 4525: return r;
4526: }
4527: #endif /* WITH_OPENSSL */
4528:
4529: int
4530: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4531: const char *passphrase, struct sshkey **keyp, char **commentp)
4532: {
1.42 djm 4533: int r = SSH_ERR_INTERNAL_ERROR;
4534:
1.32 djm 4535: if (keyp != NULL)
4536: *keyp = NULL;
1.1 djm 4537: if (commentp != NULL)
4538: *commentp = NULL;
4539:
4540: switch (type) {
1.9 markus 4541: #ifdef WITH_OPENSSL
1.1 djm 4542: case KEY_DSA:
4543: case KEY_ECDSA:
4544: case KEY_RSA:
1.8 djm 4545: return sshkey_parse_private_pem_fileblob(blob, type,
4546: passphrase, keyp);
1.1 djm 4547: #endif /* WITH_OPENSSL */
4548: case KEY_ED25519:
1.62 markus 4549: #ifdef WITH_XMSS
4550: case KEY_XMSS:
4551: #endif /* WITH_XMSS */
1.1 djm 4552: return sshkey_parse_private2(blob, type, passphrase,
4553: keyp, commentp);
4554: case KEY_UNSPEC:
1.42 djm 4555: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4556: commentp);
4557: /* Do not fallback to PEM parser if only passphrase is wrong. */
4558: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4559: return r;
1.1 djm 4560: #ifdef WITH_OPENSSL
1.8 djm 4561: return sshkey_parse_private_pem_fileblob(blob, type,
4562: passphrase, keyp);
1.1 djm 4563: #else
4564: return SSH_ERR_INVALID_FORMAT;
4565: #endif /* WITH_OPENSSL */
4566: default:
4567: return SSH_ERR_KEY_TYPE_UNKNOWN;
4568: }
4569: }
4570:
4571: int
4572: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4573: struct sshkey **keyp, char **commentp)
1.1 djm 4574: {
4575: if (keyp != NULL)
4576: *keyp = NULL;
4577: if (commentp != NULL)
4578: *commentp = NULL;
4579:
1.23 tim 4580: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4581: passphrase, keyp, commentp);
1.1 djm 4582: }
1.62 markus 4583:
4584: #ifdef WITH_XMSS
4585: /*
4586: * serialize the key with the current state and forward the state
4587: * maxsign times.
4588: */
4589: int
1.77 djm 4590: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4591: u_int32_t maxsign, sshkey_printfn *pr)
4592: {
4593: int r, rupdate;
4594:
4595: if (maxsign == 0 ||
4596: sshkey_type_plain(k->type) != KEY_XMSS)
4597: return sshkey_private_serialize_opt(k, b,
4598: SSHKEY_SERIALIZE_DEFAULT);
4599: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4600: (r = sshkey_private_serialize_opt(k, b,
4601: SSHKEY_SERIALIZE_STATE)) != 0 ||
4602: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4603: goto out;
4604: r = 0;
4605: out:
4606: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4607: if (r == 0)
4608: r = rupdate;
4609: }
4610: return r;
4611: }
4612:
4613: u_int32_t
4614: sshkey_signatures_left(const struct sshkey *k)
4615: {
4616: if (sshkey_type_plain(k->type) == KEY_XMSS)
4617: return sshkey_xmss_signatures_left(k);
4618: return 0;
4619: }
4620:
4621: int
4622: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4623: {
4624: if (sshkey_type_plain(k->type) != KEY_XMSS)
4625: return SSH_ERR_INVALID_ARGUMENT;
4626: return sshkey_xmss_enable_maxsign(k, maxsign);
4627: }
4628:
4629: int
4630: sshkey_set_filename(struct sshkey *k, const char *filename)
4631: {
4632: if (k == NULL)
4633: return SSH_ERR_INVALID_ARGUMENT;
4634: if (sshkey_type_plain(k->type) != KEY_XMSS)
4635: return 0;
4636: if (filename == NULL)
4637: return SSH_ERR_INVALID_ARGUMENT;
4638: if ((k->xmss_filename = strdup(filename)) == NULL)
4639: return SSH_ERR_ALLOC_FAIL;
4640: return 0;
4641: }
4642: #else
4643: int
1.76 djm 4644: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4645: u_int32_t maxsign, sshkey_printfn *pr)
4646: {
4647: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4648: }
4649:
4650: u_int32_t
4651: sshkey_signatures_left(const struct sshkey *k)
4652: {
4653: return 0;
4654: }
4655:
4656: int
4657: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4658: {
4659: return SSH_ERR_INVALID_ARGUMENT;
4660: }
4661:
4662: int
4663: sshkey_set_filename(struct sshkey *k, const char *filename)
4664: {
4665: if (k == NULL)
4666: return SSH_ERR_INVALID_ARGUMENT;
4667: return 0;
4668: }
4669: #endif /* WITH_XMSS */
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