Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.136
1.136 ! djm 1: /* $OpenBSD: sshkey.c,v 1.135 2023/03/31 03:22:49 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 */
1.123 djm 90: extern const struct sshkey_impl sshkey_ed25519_impl;
91: extern const struct sshkey_impl sshkey_ed25519_cert_impl;
92: extern const struct sshkey_impl sshkey_ed25519_sk_impl;
93: extern const struct sshkey_impl sshkey_ed25519_sk_cert_impl;
94: #ifdef WITH_OPENSSL
95: extern const struct sshkey_impl sshkey_ecdsa_sk_impl;
96: extern const struct sshkey_impl sshkey_ecdsa_sk_cert_impl;
97: extern const struct sshkey_impl sshkey_ecdsa_sk_webauthn_impl;
98: extern const struct sshkey_impl sshkey_ecdsa_nistp256_impl;
99: extern const struct sshkey_impl sshkey_ecdsa_nistp256_cert_impl;
100: extern const struct sshkey_impl sshkey_ecdsa_nistp384_impl;
101: extern const struct sshkey_impl sshkey_ecdsa_nistp384_cert_impl;
102: extern const struct sshkey_impl sshkey_ecdsa_nistp521_impl;
103: extern const struct sshkey_impl sshkey_ecdsa_nistp521_cert_impl;
104: extern const struct sshkey_impl sshkey_rsa_impl;
105: extern const struct sshkey_impl sshkey_rsa_cert_impl;
106: extern const struct sshkey_impl sshkey_rsa_sha256_impl;
107: extern const struct sshkey_impl sshkey_rsa_sha256_cert_impl;
108: extern const struct sshkey_impl sshkey_rsa_sha512_impl;
109: extern const struct sshkey_impl sshkey_rsa_sha512_cert_impl;
110: extern const struct sshkey_impl sshkey_dss_impl;
111: extern const struct sshkey_impl sshkey_dsa_cert_impl;
112: #endif /* WITH_OPENSSL */
1.62 markus 113: #ifdef WITH_XMSS
1.123 djm 114: extern const struct sshkey_impl sshkey_xmss_impl;
115: extern const struct sshkey_impl sshkey_xmss_cert_impl;
116: #endif
117:
118: const struct sshkey_impl * const keyimpls[] = {
119: &sshkey_ed25519_impl,
120: &sshkey_ed25519_cert_impl,
121: &sshkey_ed25519_sk_impl,
122: &sshkey_ed25519_sk_cert_impl,
123: #ifdef WITH_OPENSSL
124: &sshkey_ecdsa_nistp256_impl,
125: &sshkey_ecdsa_nistp256_cert_impl,
126: &sshkey_ecdsa_nistp384_impl,
127: &sshkey_ecdsa_nistp384_cert_impl,
128: &sshkey_ecdsa_nistp521_impl,
129: &sshkey_ecdsa_nistp521_cert_impl,
130: &sshkey_ecdsa_sk_impl,
131: &sshkey_ecdsa_sk_cert_impl,
132: &sshkey_ecdsa_sk_webauthn_impl,
133: &sshkey_dss_impl,
134: &sshkey_dsa_cert_impl,
135: &sshkey_rsa_impl,
136: &sshkey_rsa_cert_impl,
137: &sshkey_rsa_sha256_impl,
138: &sshkey_rsa_sha256_cert_impl,
139: &sshkey_rsa_sha512_impl,
140: &sshkey_rsa_sha512_cert_impl,
1.1 djm 141: #endif /* WITH_OPENSSL */
1.123 djm 142: #ifdef WITH_XMSS
143: &sshkey_xmss_impl,
144: &sshkey_xmss_cert_impl,
145: #endif
146: NULL
1.1 djm 147: };
148:
1.123 djm 149: static const struct sshkey_impl *
150: sshkey_impl_from_type(int type)
151: {
152: int i;
153:
154: for (i = 0; keyimpls[i] != NULL; i++) {
155: if (keyimpls[i]->type == type)
156: return keyimpls[i];
157: }
158: return NULL;
159: }
160:
161: static const struct sshkey_impl *
162: sshkey_impl_from_type_nid(int type, int nid)
163: {
164: int i;
165:
166: for (i = 0; keyimpls[i] != NULL; i++) {
167: if (keyimpls[i]->type == type &&
168: (keyimpls[i]->nid == 0 || keyimpls[i]->nid == nid))
169: return keyimpls[i];
170: }
171: return NULL;
172: }
173:
1.126 djm 174: static const struct sshkey_impl *
175: sshkey_impl_from_key(const struct sshkey *k)
176: {
177: if (k == NULL)
178: return NULL;
179: return sshkey_impl_from_type_nid(k->type, k->ecdsa_nid);
180: }
181:
1.1 djm 182: const char *
183: sshkey_type(const struct sshkey *k)
184: {
1.123 djm 185: const struct sshkey_impl *impl;
1.1 djm 186:
1.126 djm 187: if ((impl = sshkey_impl_from_key(k)) == NULL)
1.123 djm 188: return "unknown";
189: return impl->shortname;
1.1 djm 190: }
191:
192: static const char *
193: sshkey_ssh_name_from_type_nid(int type, int nid)
194: {
1.123 djm 195: const struct sshkey_impl *impl;
1.1 djm 196:
1.123 djm 197: if ((impl = sshkey_impl_from_type_nid(type, nid)) == NULL)
198: return "ssh-unknown";
199: return impl->name;
1.1 djm 200: }
201:
202: int
203: sshkey_type_is_cert(int type)
204: {
1.123 djm 205: const struct sshkey_impl *impl;
1.1 djm 206:
1.123 djm 207: if ((impl = sshkey_impl_from_type(type)) == NULL)
208: return 0;
209: return impl->cert;
1.1 djm 210: }
211:
212: const char *
213: sshkey_ssh_name(const struct sshkey *k)
214: {
215: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
216: }
217:
218: const char *
219: sshkey_ssh_name_plain(const struct sshkey *k)
220: {
221: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
222: k->ecdsa_nid);
223: }
224:
225: int
226: sshkey_type_from_name(const char *name)
227: {
1.123 djm 228: int i;
229: const struct sshkey_impl *impl;
1.1 djm 230:
1.123 djm 231: for (i = 0; keyimpls[i] != NULL; i++) {
232: impl = keyimpls[i];
1.1 djm 233: /* Only allow shortname matches for plain key types */
1.123 djm 234: if ((impl->name != NULL && strcmp(name, impl->name) == 0) ||
235: (!impl->cert && strcasecmp(impl->shortname, name) == 0))
236: return impl->type;
1.1 djm 237: }
238: return KEY_UNSPEC;
239: }
240:
1.85 djm 241: static int
242: key_type_is_ecdsa_variant(int type)
243: {
244: switch (type) {
245: case KEY_ECDSA:
246: case KEY_ECDSA_CERT:
247: case KEY_ECDSA_SK:
248: case KEY_ECDSA_SK_CERT:
249: return 1;
250: }
251: return 0;
252: }
253:
1.1 djm 254: int
255: sshkey_ecdsa_nid_from_name(const char *name)
256: {
1.123 djm 257: int i;
1.1 djm 258:
1.123 djm 259: for (i = 0; keyimpls[i] != NULL; i++) {
260: if (!key_type_is_ecdsa_variant(keyimpls[i]->type))
1.4 djm 261: continue;
1.123 djm 262: if (keyimpls[i]->name != NULL &&
263: strcmp(name, keyimpls[i]->name) == 0)
264: return keyimpls[i]->nid;
1.4 djm 265: }
1.1 djm 266: return -1;
1.120 djm 267: }
268:
269: int
270: sshkey_match_keyname_to_sigalgs(const char *keyname, const char *sigalgs)
271: {
272: int ktype;
273:
274: if (sigalgs == NULL || *sigalgs == '\0' ||
275: (ktype = sshkey_type_from_name(keyname)) == KEY_UNSPEC)
276: return 0;
277: else if (ktype == KEY_RSA) {
278: return match_pattern_list("ssh-rsa", sigalgs, 0) == 1 ||
279: match_pattern_list("rsa-sha2-256", sigalgs, 0) == 1 ||
280: match_pattern_list("rsa-sha2-512", sigalgs, 0) == 1;
281: } else if (ktype == KEY_RSA_CERT) {
282: return match_pattern_list("ssh-rsa-cert-v01@openssh.com",
283: sigalgs, 0) == 1 ||
284: match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
285: sigalgs, 0) == 1 ||
286: match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
287: sigalgs, 0) == 1;
288: } else
289: return match_pattern_list(keyname, sigalgs, 0) == 1;
1.1 djm 290: }
291:
292: char *
1.45 djm 293: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 294: {
295: char *tmp, *ret = NULL;
1.123 djm 296: size_t i, nlen, rlen = 0;
297: const struct sshkey_impl *impl;
1.1 djm 298:
1.123 djm 299: for (i = 0; keyimpls[i] != NULL; i++) {
300: impl = keyimpls[i];
301: if (impl->name == NULL)
1.45 djm 302: continue;
1.123 djm 303: if (!include_sigonly && impl->sigonly)
1.1 djm 304: continue;
1.123 djm 305: if ((certs_only && !impl->cert) || (plain_only && impl->cert))
1.1 djm 306: continue;
307: if (ret != NULL)
1.38 djm 308: ret[rlen++] = sep;
1.123 djm 309: nlen = strlen(impl->name);
1.1 djm 310: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
311: free(ret);
312: return NULL;
313: }
314: ret = tmp;
1.123 djm 315: memcpy(ret + rlen, impl->name, nlen + 1);
1.1 djm 316: rlen += nlen;
317: }
318: return ret;
319: }
320:
321: int
1.136 ! djm 322: sshkey_names_valid2(const char *names, int allow_wildcard, int plain_only)
1.1 djm 323: {
324: char *s, *cp, *p;
1.123 djm 325: const struct sshkey_impl *impl;
326: int i, type;
1.1 djm 327:
328: if (names == NULL || strcmp(names, "") == 0)
329: return 0;
330: if ((s = cp = strdup(names)) == NULL)
331: return 0;
332: for ((p = strsep(&cp, ",")); p && *p != '\0';
333: (p = strsep(&cp, ","))) {
1.11 djm 334: type = sshkey_type_from_name(p);
335: if (type == KEY_UNSPEC) {
336: if (allow_wildcard) {
337: /*
338: * Try matching key types against the string.
339: * If any has a positive or negative match then
340: * the component is accepted.
341: */
1.123 djm 342: impl = NULL;
343: for (i = 0; keyimpls[i] != NULL; i++) {
344: if (match_pattern_list(
345: keyimpls[i]->name, p, 0) != 0) {
346: impl = keyimpls[i];
1.11 djm 347: break;
1.123 djm 348: }
1.11 djm 349: }
1.123 djm 350: if (impl != NULL)
1.11 djm 351: continue;
352: }
1.136 ! djm 353: free(s);
! 354: return 0;
! 355: } else if (plain_only && sshkey_type_is_cert(type)) {
1.1 djm 356: free(s);
357: return 0;
358: }
359: }
360: free(s);
361: return 1;
362: }
363:
364: u_int
365: sshkey_size(const struct sshkey *k)
366: {
1.123 djm 367: const struct sshkey_impl *impl;
1.69 djm 368:
1.126 djm 369: if ((impl = sshkey_impl_from_key(k)) == NULL)
1.123 djm 370: return 0;
371: if (impl->funcs->size != NULL)
372: return impl->funcs->size(k);
373: return impl->keybits;
1.1 djm 374: }
375:
376: static int
377: sshkey_type_is_valid_ca(int type)
378: {
1.123 djm 379: const struct sshkey_impl *impl;
380:
381: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 382: return 0;
1.123 djm 383: /* All non-certificate types may act as CAs */
384: return !impl->cert;
1.1 djm 385: }
386:
387: int
388: sshkey_is_cert(const struct sshkey *k)
389: {
390: if (k == NULL)
391: return 0;
392: return sshkey_type_is_cert(k->type);
393: }
394:
1.90 markus 395: int
396: sshkey_is_sk(const struct sshkey *k)
397: {
398: if (k == NULL)
399: return 0;
400: switch (sshkey_type_plain(k->type)) {
401: case KEY_ECDSA_SK:
402: case KEY_ED25519_SK:
403: return 1;
404: default:
405: return 0;
406: }
407: }
408:
1.1 djm 409: /* Return the cert-less equivalent to a certified key type */
410: int
411: sshkey_type_plain(int type)
412: {
413: switch (type) {
414: case KEY_RSA_CERT:
415: return KEY_RSA;
416: case KEY_DSA_CERT:
417: return KEY_DSA;
418: case KEY_ECDSA_CERT:
419: return KEY_ECDSA;
1.85 djm 420: case KEY_ECDSA_SK_CERT:
421: return KEY_ECDSA_SK;
1.1 djm 422: case KEY_ED25519_CERT:
423: return KEY_ED25519;
1.90 markus 424: case KEY_ED25519_SK_CERT:
425: return KEY_ED25519_SK;
1.62 markus 426: case KEY_XMSS_CERT:
427: return KEY_XMSS;
1.1 djm 428: default:
429: return type;
430: }
431: }
432:
1.131 djm 433: /* Return the cert equivalent to a plain key type */
434: static int
435: sshkey_type_certified(int type)
436: {
437: switch (type) {
438: case KEY_RSA:
439: return KEY_RSA_CERT;
440: case KEY_DSA:
441: return KEY_DSA_CERT;
442: case KEY_ECDSA:
443: return KEY_ECDSA_CERT;
444: case KEY_ECDSA_SK:
445: return KEY_ECDSA_SK_CERT;
446: case KEY_ED25519:
447: return KEY_ED25519_CERT;
448: case KEY_ED25519_SK:
449: return KEY_ED25519_SK_CERT;
450: case KEY_XMSS:
451: return KEY_XMSS_CERT;
452: default:
453: return -1;
454: }
455: }
456:
1.1 djm 457: #ifdef WITH_OPENSSL
458: /* XXX: these are really begging for a table-driven approach */
459: int
460: sshkey_curve_name_to_nid(const char *name)
461: {
462: if (strcmp(name, "nistp256") == 0)
463: return NID_X9_62_prime256v1;
464: else if (strcmp(name, "nistp384") == 0)
465: return NID_secp384r1;
466: else if (strcmp(name, "nistp521") == 0)
467: return NID_secp521r1;
468: else
469: return -1;
470: }
471:
472: u_int
473: sshkey_curve_nid_to_bits(int nid)
474: {
475: switch (nid) {
476: case NID_X9_62_prime256v1:
477: return 256;
478: case NID_secp384r1:
479: return 384;
480: case NID_secp521r1:
481: return 521;
482: default:
483: return 0;
484: }
485: }
486:
487: int
488: sshkey_ecdsa_bits_to_nid(int bits)
489: {
490: switch (bits) {
491: case 256:
492: return NID_X9_62_prime256v1;
493: case 384:
494: return NID_secp384r1;
495: case 521:
496: return NID_secp521r1;
497: default:
498: return -1;
499: }
500: }
501:
502: const char *
503: sshkey_curve_nid_to_name(int nid)
504: {
505: switch (nid) {
506: case NID_X9_62_prime256v1:
507: return "nistp256";
508: case NID_secp384r1:
509: return "nistp384";
510: case NID_secp521r1:
511: return "nistp521";
512: default:
513: return NULL;
514: }
515: }
516:
517: int
518: sshkey_ec_nid_to_hash_alg(int nid)
519: {
520: int kbits = sshkey_curve_nid_to_bits(nid);
521:
522: if (kbits <= 0)
523: return -1;
524:
525: /* RFC5656 section 6.2.1 */
526: if (kbits <= 256)
527: return SSH_DIGEST_SHA256;
528: else if (kbits <= 384)
529: return SSH_DIGEST_SHA384;
530: else
531: return SSH_DIGEST_SHA512;
532: }
533: #endif /* WITH_OPENSSL */
534:
535: static void
536: cert_free(struct sshkey_cert *cert)
537: {
538: u_int i;
539:
540: if (cert == NULL)
541: return;
1.31 mmcc 542: sshbuf_free(cert->certblob);
543: sshbuf_free(cert->critical);
544: sshbuf_free(cert->extensions);
1.29 mmcc 545: free(cert->key_id);
1.1 djm 546: for (i = 0; i < cert->nprincipals; i++)
547: free(cert->principals[i]);
1.29 mmcc 548: free(cert->principals);
1.30 mmcc 549: sshkey_free(cert->signature_key);
1.67 djm 550: free(cert->signature_type);
1.61 jsing 551: freezero(cert, sizeof(*cert));
1.1 djm 552: }
553:
554: static struct sshkey_cert *
555: cert_new(void)
556: {
557: struct sshkey_cert *cert;
558:
559: if ((cert = calloc(1, sizeof(*cert))) == NULL)
560: return NULL;
561: if ((cert->certblob = sshbuf_new()) == NULL ||
562: (cert->critical = sshbuf_new()) == NULL ||
563: (cert->extensions = sshbuf_new()) == NULL) {
564: cert_free(cert);
565: return NULL;
566: }
567: cert->key_id = NULL;
568: cert->principals = NULL;
569: cert->signature_key = NULL;
1.67 djm 570: cert->signature_type = NULL;
1.1 djm 571: return cert;
572: }
573:
574: struct sshkey *
575: sshkey_new(int type)
576: {
577: struct sshkey *k;
1.123 djm 578: const struct sshkey_impl *impl = NULL;
579:
580: if (type != KEY_UNSPEC &&
581: (impl = sshkey_impl_from_type(type)) == NULL)
582: return NULL;
1.1 djm 583:
1.123 djm 584: /* All non-certificate types may act as CAs */
1.1 djm 585: if ((k = calloc(1, sizeof(*k))) == NULL)
586: return NULL;
587: k->type = type;
588: k->ecdsa_nid = -1;
1.123 djm 589: if (impl != NULL && impl->funcs->alloc != NULL) {
590: if (impl->funcs->alloc(k) != 0) {
1.1 djm 591: free(k);
592: return NULL;
593: }
594: }
595: if (sshkey_is_cert(k)) {
596: if ((k->cert = cert_new()) == NULL) {
597: sshkey_free(k);
598: return NULL;
599: }
600: }
601:
602: return k;
603: }
604:
1.124 djm 605: /* Frees common FIDO fields */
606: void
607: sshkey_sk_cleanup(struct sshkey *k)
608: {
609: free(k->sk_application);
610: sshbuf_free(k->sk_key_handle);
611: sshbuf_free(k->sk_reserved);
612: k->sk_application = NULL;
613: k->sk_key_handle = k->sk_reserved = NULL;
614: }
615:
1.126 djm 616: static void
617: sshkey_free_contents(struct sshkey *k)
1.1 djm 618: {
1.123 djm 619: const struct sshkey_impl *impl;
620:
1.1 djm 621: if (k == NULL)
622: return;
1.123 djm 623: if ((impl = sshkey_impl_from_type(k->type)) != NULL &&
624: impl->funcs->cleanup != NULL)
625: impl->funcs->cleanup(k);
1.1 djm 626: if (sshkey_is_cert(k))
627: cert_free(k->cert);
1.76 djm 628: freezero(k->shielded_private, k->shielded_len);
629: freezero(k->shield_prekey, k->shield_prekey_len);
1.126 djm 630: }
631:
632: void
633: sshkey_free(struct sshkey *k)
634: {
635: sshkey_free_contents(k);
1.61 jsing 636: freezero(k, sizeof(*k));
1.1 djm 637: }
638:
639: static int
640: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
641: {
642: if (a == NULL && b == NULL)
643: return 1;
644: if (a == NULL || b == NULL)
645: return 0;
646: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
647: return 0;
648: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
649: sshbuf_len(a->certblob)) != 0)
650: return 0;
651: return 1;
652: }
653:
1.124 djm 654: /* Compares FIDO-specific pubkey fields only */
655: int
656: sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b)
657: {
658: if (a->sk_application == NULL || b->sk_application == NULL)
659: return 0;
660: if (strcmp(a->sk_application, b->sk_application) != 0)
661: return 0;
662: return 1;
663: }
664:
1.1 djm 665: /*
666: * Compare public portions of key only, allowing comparisons between
667: * certificates and plain keys too.
668: */
669: int
670: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
671: {
1.124 djm 672: const struct sshkey_impl *impl;
1.1 djm 673:
674: if (a == NULL || b == NULL ||
675: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
676: return 0;
1.124 djm 677: if ((impl = sshkey_impl_from_type(a->type)) == NULL)
1.1 djm 678: return 0;
1.124 djm 679: return impl->funcs->equal(a, b);
1.1 djm 680: }
681:
682: int
683: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
684: {
685: if (a == NULL || b == NULL || a->type != b->type)
686: return 0;
687: if (sshkey_is_cert(a)) {
688: if (!cert_compare(a->cert, b->cert))
689: return 0;
690: }
691: return sshkey_equal_public(a, b);
692: }
693:
1.125 djm 694:
695: /* Serialise common FIDO key parts */
696: int
697: sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b)
698: {
699: int r;
700:
701: if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0)
702: return r;
703:
704: return 0;
705: }
706:
1.1 djm 707: static int
1.62 markus 708: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
709: enum sshkey_serialize_rep opts)
1.1 djm 710: {
711: int type, ret = SSH_ERR_INTERNAL_ERROR;
712: const char *typename;
1.125 djm 713: const struct sshkey_impl *impl;
1.1 djm 714:
715: if (key == NULL)
716: return SSH_ERR_INVALID_ARGUMENT;
717:
1.125 djm 718: type = force_plain ? sshkey_type_plain(key->type) : key->type;
719:
720: if (sshkey_type_is_cert(type)) {
1.19 djm 721: if (key->cert == NULL)
722: return SSH_ERR_EXPECTED_CERT;
723: if (sshbuf_len(key->cert->certblob) == 0)
724: return SSH_ERR_KEY_LACKS_CERTBLOB;
1.1 djm 725: /* Use the existing blob */
726: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
727: return ret;
1.125 djm 728: return 0;
729: }
730: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 731: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.125 djm 732:
733: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
1.129 djm 734: if ((ret = sshbuf_put_cstring(b, typename)) != 0)
735: return ret;
736: return impl->funcs->serialize_public(key, b, opts);
1.1 djm 737: }
738:
739: int
1.14 djm 740: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 741: {
1.62 markus 742: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 743: }
744:
745: int
1.62 markus 746: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
747: enum sshkey_serialize_rep opts)
1.14 djm 748: {
749: struct sshbuf *tmp;
750: int r;
751:
752: if ((tmp = sshbuf_new()) == NULL)
753: return SSH_ERR_ALLOC_FAIL;
1.62 markus 754: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 755: if (r == 0)
756: r = sshbuf_put_stringb(b, tmp);
757: sshbuf_free(tmp);
758: return r;
759: }
760:
761: int
1.62 markus 762: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
763: {
764: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
765: }
766:
767: int
1.14 djm 768: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 769: {
1.62 markus 770: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 771: }
772:
773: static int
1.62 markus 774: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
775: enum sshkey_serialize_rep opts)
1.1 djm 776: {
777: int ret = SSH_ERR_INTERNAL_ERROR;
778: size_t len;
779: struct sshbuf *b = NULL;
780:
781: if (lenp != NULL)
782: *lenp = 0;
783: if (blobp != NULL)
784: *blobp = NULL;
785: if ((b = sshbuf_new()) == NULL)
786: return SSH_ERR_ALLOC_FAIL;
1.62 markus 787: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 788: goto out;
789: len = sshbuf_len(b);
790: if (lenp != NULL)
791: *lenp = len;
792: if (blobp != NULL) {
793: if ((*blobp = malloc(len)) == NULL) {
794: ret = SSH_ERR_ALLOC_FAIL;
795: goto out;
796: }
797: memcpy(*blobp, sshbuf_ptr(b), len);
798: }
799: ret = 0;
800: out:
801: sshbuf_free(b);
802: return ret;
803: }
804:
805: int
806: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
807: {
1.62 markus 808: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 809: }
810:
811: int
812: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
813: {
1.62 markus 814: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 815: }
816:
817: int
1.7 djm 818: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 819: u_char **retp, size_t *lenp)
820: {
821: u_char *blob = NULL, *ret = NULL;
822: size_t blob_len = 0;
1.7 djm 823: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 824:
825: if (retp != NULL)
826: *retp = NULL;
827: if (lenp != NULL)
828: *lenp = 0;
1.7 djm 829: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 830: r = SSH_ERR_INVALID_ARGUMENT;
831: goto out;
832: }
1.62 markus 833: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
834: != 0)
1.1 djm 835: goto out;
836: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
837: r = SSH_ERR_ALLOC_FAIL;
838: goto out;
839: }
1.7 djm 840: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 841: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
842: goto out;
843: /* success */
844: if (retp != NULL) {
845: *retp = ret;
846: ret = NULL;
847: }
848: if (lenp != NULL)
1.7 djm 849: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 850: r = 0;
851: out:
852: free(ret);
1.100 jsg 853: if (blob != NULL)
854: freezero(blob, blob_len);
1.1 djm 855: return r;
856: }
857:
858: static char *
1.7 djm 859: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
860: {
861: char *ret;
862: size_t plen = strlen(alg) + 1;
863: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
864:
865: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
866: return NULL;
867: strlcpy(ret, alg, rlen);
868: strlcat(ret, ":", rlen);
869: if (dgst_raw_len == 0)
870: return ret;
1.79 dtucker 871: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 872: freezero(ret, rlen);
1.7 djm 873: return NULL;
874: }
875: /* Trim padding characters from end */
876: ret[strcspn(ret, "=")] = '\0';
877: return ret;
878: }
879:
880: static char *
881: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 882: {
1.7 djm 883: char *retval, hex[5];
884: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 885:
1.7 djm 886: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 887: return NULL;
1.7 djm 888: strlcpy(retval, alg, rlen);
889: strlcat(retval, ":", rlen);
1.1 djm 890: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 891: snprintf(hex, sizeof(hex), "%s%02x",
892: i > 0 ? ":" : "", dgst_raw[i]);
893: strlcat(retval, hex, rlen);
1.1 djm 894: }
895: return retval;
896: }
897:
898: static char *
899: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
900: {
901: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
902: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
903: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
904: u_int i, j = 0, rounds, seed = 1;
905: char *retval;
906:
907: rounds = (dgst_raw_len / 2) + 1;
908: if ((retval = calloc(rounds, 6)) == NULL)
909: return NULL;
910: retval[j++] = 'x';
911: for (i = 0; i < rounds; i++) {
912: u_int idx0, idx1, idx2, idx3, idx4;
913: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
914: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
915: seed) % 6;
916: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
917: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
918: (seed / 6)) % 6;
919: retval[j++] = vowels[idx0];
920: retval[j++] = consonants[idx1];
921: retval[j++] = vowels[idx2];
922: if ((i + 1) < rounds) {
923: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
924: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
925: retval[j++] = consonants[idx3];
926: retval[j++] = '-';
927: retval[j++] = consonants[idx4];
928: seed = ((seed * 5) +
929: ((((u_int)(dgst_raw[2 * i])) * 7) +
930: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
931: }
932: } else {
933: idx0 = seed % 6;
934: idx1 = 16;
935: idx2 = seed / 6;
936: retval[j++] = vowels[idx0];
937: retval[j++] = consonants[idx1];
938: retval[j++] = vowels[idx2];
939: }
940: }
941: retval[j++] = 'x';
942: retval[j++] = '\0';
943: return retval;
944: }
945:
946: /*
947: * Draw an ASCII-Art representing the fingerprint so human brain can
948: * profit from its built-in pattern recognition ability.
949: * This technique is called "random art" and can be found in some
950: * scientific publications like this original paper:
951: *
952: * "Hash Visualization: a New Technique to improve Real-World Security",
953: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
954: * Techniques and E-Commerce (CrypTEC '99)
955: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
956: *
957: * The subject came up in a talk by Dan Kaminsky, too.
958: *
959: * If you see the picture is different, the key is different.
960: * If the picture looks the same, you still know nothing.
961: *
962: * The algorithm used here is a worm crawling over a discrete plane,
963: * leaving a trace (augmenting the field) everywhere it goes.
964: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
965: * makes the respective movement vector be ignored for this turn.
966: * Graphs are not unambiguous, because circles in graphs can be
967: * walked in either direction.
968: */
969:
970: /*
971: * Field sizes for the random art. Have to be odd, so the starting point
972: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
973: * Else pictures would be too dense, and drawing the frame would
974: * fail, too, because the key type would not fit in anymore.
975: */
976: #define FLDBASE 8
977: #define FLDSIZE_Y (FLDBASE + 1)
978: #define FLDSIZE_X (FLDBASE * 2 + 1)
979: static char *
1.7 djm 980: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 981: const struct sshkey *k)
982: {
983: /*
984: * Chars to be used after each other every time the worm
985: * intersects with itself. Matter of taste.
986: */
987: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 988: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 989: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 990: size_t i, tlen, hlen;
1.1 djm 991: u_int b;
1.3 djm 992: int x, y, r;
1.1 djm 993: size_t len = strlen(augmentation_string) - 1;
994:
995: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
996: return NULL;
997:
998: /* initialize field */
999: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1000: x = FLDSIZE_X / 2;
1001: y = FLDSIZE_Y / 2;
1002:
1003: /* process raw key */
1004: for (i = 0; i < dgst_raw_len; i++) {
1005: int input;
1006: /* each byte conveys four 2-bit move commands */
1007: input = dgst_raw[i];
1008: for (b = 0; b < 4; b++) {
1009: /* evaluate 2 bit, rest is shifted later */
1010: x += (input & 0x1) ? 1 : -1;
1011: y += (input & 0x2) ? 1 : -1;
1012:
1013: /* assure we are still in bounds */
1.37 deraadt 1014: x = MAXIMUM(x, 0);
1015: y = MAXIMUM(y, 0);
1016: x = MINIMUM(x, FLDSIZE_X - 1);
1017: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1018:
1019: /* augment the field */
1020: if (field[x][y] < len - 2)
1021: field[x][y]++;
1022: input = input >> 2;
1023: }
1024: }
1025:
1026: /* mark starting point and end point*/
1027: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1028: field[x][y] = len;
1029:
1.3 djm 1030: /* assemble title */
1031: r = snprintf(title, sizeof(title), "[%s %u]",
1032: sshkey_type(k), sshkey_size(k));
1033: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1034: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1035: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1036: tlen = (r <= 0) ? 0 : strlen(title);
1037:
1038: /* assemble hash ID. */
1039: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1040: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1041:
1042: /* output upper border */
1.3 djm 1043: p = retval;
1044: *p++ = '+';
1045: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1046: *p++ = '-';
1047: memcpy(p, title, tlen);
1048: p += tlen;
1.7 djm 1049: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1050: *p++ = '-';
1051: *p++ = '+';
1052: *p++ = '\n';
1053:
1054: /* output content */
1055: for (y = 0; y < FLDSIZE_Y; y++) {
1056: *p++ = '|';
1057: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1058: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1059: *p++ = '|';
1060: *p++ = '\n';
1061: }
1062:
1063: /* output lower border */
1064: *p++ = '+';
1.7 djm 1065: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1066: *p++ = '-';
1067: memcpy(p, hash, hlen);
1068: p += hlen;
1069: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1070: *p++ = '-';
1071: *p++ = '+';
1072:
1073: return retval;
1074: }
1075:
1076: char *
1.7 djm 1077: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1078: enum sshkey_fp_rep dgst_rep)
1079: {
1080: char *retval = NULL;
1081: u_char *dgst_raw;
1082: size_t dgst_raw_len;
1083:
1.7 djm 1084: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1085: return NULL;
1086: switch (dgst_rep) {
1.7 djm 1087: case SSH_FP_DEFAULT:
1088: if (dgst_alg == SSH_DIGEST_MD5) {
1089: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1090: dgst_raw, dgst_raw_len);
1091: } else {
1092: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1093: dgst_raw, dgst_raw_len);
1094: }
1095: break;
1.1 djm 1096: case SSH_FP_HEX:
1.7 djm 1097: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1098: dgst_raw, dgst_raw_len);
1099: break;
1100: case SSH_FP_BASE64:
1101: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1102: dgst_raw, dgst_raw_len);
1.1 djm 1103: break;
1104: case SSH_FP_BUBBLEBABBLE:
1105: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1106: break;
1107: case SSH_FP_RANDOMART:
1.7 djm 1108: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1109: dgst_raw, dgst_raw_len, k);
1.1 djm 1110: break;
1111: default:
1.100 jsg 1112: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1113: return NULL;
1114: }
1.100 jsg 1115: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1116: return retval;
1117: }
1118:
1.63 djm 1119: static int
1120: peek_type_nid(const char *s, size_t l, int *nid)
1121: {
1.123 djm 1122: const struct sshkey_impl *impl;
1123: int i;
1.63 djm 1124:
1.123 djm 1125: for (i = 0; keyimpls[i] != NULL; i++) {
1126: impl = keyimpls[i];
1127: if (impl->name == NULL || strlen(impl->name) != l)
1.63 djm 1128: continue;
1.123 djm 1129: if (memcmp(s, impl->name, l) == 0) {
1.63 djm 1130: *nid = -1;
1.123 djm 1131: if (key_type_is_ecdsa_variant(impl->type))
1132: *nid = impl->nid;
1133: return impl->type;
1.63 djm 1134: }
1135: }
1136: return KEY_UNSPEC;
1137: }
1.1 djm 1138:
1.63 djm 1139: /* XXX this can now be made const char * */
1.1 djm 1140: int
1141: sshkey_read(struct sshkey *ret, char **cpp)
1142: {
1143: struct sshkey *k;
1.63 djm 1144: char *cp, *blobcopy;
1145: size_t space;
1.1 djm 1146: int r, type, curve_nid = -1;
1147: struct sshbuf *blob;
1.44 dtucker 1148:
1149: if (ret == NULL)
1150: return SSH_ERR_INVALID_ARGUMENT;
1.126 djm 1151: if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL)
1.63 djm 1152: return SSH_ERR_INVALID_ARGUMENT;
1153:
1154: /* Decode type */
1155: cp = *cpp;
1156: space = strcspn(cp, " \t");
1157: if (space == strlen(cp))
1158: return SSH_ERR_INVALID_FORMAT;
1159: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1160: return SSH_ERR_INVALID_FORMAT;
1161:
1162: /* skip whitespace */
1163: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1164: ;
1165: if (*cp == '\0')
1166: return SSH_ERR_INVALID_FORMAT;
1167: if (ret->type != KEY_UNSPEC && ret->type != type)
1168: return SSH_ERR_KEY_TYPE_MISMATCH;
1169: if ((blob = sshbuf_new()) == NULL)
1170: return SSH_ERR_ALLOC_FAIL;
1171:
1172: /* find end of keyblob and decode */
1173: space = strcspn(cp, " \t");
1174: if ((blobcopy = strndup(cp, space)) == NULL) {
1175: sshbuf_free(blob);
1176: return SSH_ERR_ALLOC_FAIL;
1177: }
1178: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1179: free(blobcopy);
1180: sshbuf_free(blob);
1181: return r;
1182: }
1183: free(blobcopy);
1184: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1185: sshbuf_free(blob);
1.63 djm 1186: return r;
1187: }
1188: sshbuf_free(blob);
1189:
1190: /* skip whitespace and leave cp at start of comment */
1191: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1192: ;
1193:
1194: /* ensure type of blob matches type at start of line */
1195: if (k->type != type) {
1196: sshkey_free(k);
1197: return SSH_ERR_KEY_TYPE_MISMATCH;
1198: }
1.85 djm 1199: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1200: sshkey_free(k);
1201: return SSH_ERR_EC_CURVE_MISMATCH;
1202: }
1203:
1204: /* Fill in ret from parsed key */
1.126 djm 1205: sshkey_free_contents(ret);
1206: *ret = *k;
1207: freezero(k, sizeof(*k));
1.63 djm 1208:
1209: /* success */
1210: *cpp = cp;
1211: return 0;
1.1 djm 1212: }
1213:
1214: int
1.19 djm 1215: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1216: {
1.19 djm 1217: int r = SSH_ERR_INTERNAL_ERROR;
1218: struct sshbuf *b = NULL;
1.1 djm 1219: char *uu = NULL;
1.19 djm 1220:
1221: if (b64p != NULL)
1222: *b64p = NULL;
1223: if ((b = sshbuf_new()) == NULL)
1224: return SSH_ERR_ALLOC_FAIL;
1225: if ((r = sshkey_putb(key, b)) != 0)
1226: goto out;
1.81 djm 1227: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1228: r = SSH_ERR_ALLOC_FAIL;
1229: goto out;
1230: }
1231: /* Success */
1232: if (b64p != NULL) {
1233: *b64p = uu;
1234: uu = NULL;
1235: }
1236: r = 0;
1237: out:
1238: sshbuf_free(b);
1239: free(uu);
1240: return r;
1241: }
1242:
1.52 djm 1243: int
1.19 djm 1244: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1245: {
1246: int r = SSH_ERR_INTERNAL_ERROR;
1247: char *uu = NULL;
1248:
1.48 djm 1249: if ((r = sshkey_to_base64(key, &uu)) != 0)
1250: goto out;
1251: if ((r = sshbuf_putf(b, "%s %s",
1252: sshkey_ssh_name(key), uu)) != 0)
1253: goto out;
1.19 djm 1254: r = 0;
1255: out:
1256: free(uu);
1257: return r;
1258: }
1259:
1260: int
1261: sshkey_write(const struct sshkey *key, FILE *f)
1262: {
1263: struct sshbuf *b = NULL;
1264: int r = SSH_ERR_INTERNAL_ERROR;
1265:
1266: if ((b = sshbuf_new()) == NULL)
1267: return SSH_ERR_ALLOC_FAIL;
1268: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1269: goto out;
1270: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1271: if (feof(f))
1272: errno = EPIPE;
1.19 djm 1273: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1274: goto out;
1275: }
1.19 djm 1276: /* Success */
1277: r = 0;
1.1 djm 1278: out:
1.19 djm 1279: sshbuf_free(b);
1280: return r;
1.1 djm 1281: }
1282:
1283: const char *
1284: sshkey_cert_type(const struct sshkey *k)
1285: {
1286: switch (k->cert->type) {
1287: case SSH2_CERT_TYPE_USER:
1288: return "user";
1289: case SSH2_CERT_TYPE_HOST:
1290: return "host";
1291: default:
1292: return "unknown";
1293: }
1294: }
1295:
1.134 djm 1296: int
1297: sshkey_check_rsa_length(const struct sshkey *k, int min_size)
1298: {
1299: #ifdef WITH_OPENSSL
1300: const BIGNUM *rsa_n;
1301: int nbits;
1302:
1303: if (k == NULL || k->rsa == NULL ||
1304: (k->type != KEY_RSA && k->type != KEY_RSA_CERT))
1305: return 0;
1306: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
1307: nbits = BN_num_bits(rsa_n);
1308: if (nbits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1309: (min_size > 0 && nbits < min_size))
1310: return SSH_ERR_KEY_LENGTH;
1311: #endif /* WITH_OPENSSL */
1312: return 0;
1313: }
1314:
1.1 djm 1315: #ifdef WITH_OPENSSL
1316: int
1317: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1318: {
1319: EC_GROUP *eg;
1320: int nids[] = {
1321: NID_X9_62_prime256v1,
1322: NID_secp384r1,
1323: NID_secp521r1,
1324: -1
1325: };
1326: int nid;
1327: u_int i;
1328: const EC_GROUP *g = EC_KEY_get0_group(k);
1329:
1330: /*
1331: * The group may be stored in a ASN.1 encoded private key in one of two
1332: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1333: * or explicit group parameters encoded into the key blob. Only the
1334: * "named group" case sets the group NID for us, but we can figure
1335: * it out for the other case by comparing against all the groups that
1336: * are supported.
1337: */
1338: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1339: return nid;
1340: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1341: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1342: return -1;
1.93 djm 1343: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1344: break;
1345: EC_GROUP_free(eg);
1346: }
1347: if (nids[i] != -1) {
1348: /* Use the group with the NID attached */
1349: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1350: if (EC_KEY_set_group(k, eg) != 1) {
1351: EC_GROUP_free(eg);
1352: return -1;
1353: }
1354: }
1355: return nids[i];
1356: }
1357: #endif /* WITH_OPENSSL */
1358:
1359: int
1360: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1361: {
1362: struct sshkey *k;
1363: int ret = SSH_ERR_INTERNAL_ERROR;
1.127 djm 1364: const struct sshkey_impl *impl;
1.1 djm 1365:
1.127 djm 1366: if (keyp == NULL || sshkey_type_is_cert(type))
1.1 djm 1367: return SSH_ERR_INVALID_ARGUMENT;
1368: *keyp = NULL;
1.127 djm 1369: if ((impl = sshkey_impl_from_type(type)) == NULL)
1370: return SSH_ERR_KEY_TYPE_UNKNOWN;
1371: if (impl->funcs->generate == NULL)
1372: return SSH_ERR_FEATURE_UNSUPPORTED;
1.1 djm 1373: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1374: return SSH_ERR_ALLOC_FAIL;
1.127 djm 1375: k->type = type;
1376: if ((ret = impl->funcs->generate(k, bits)) != 0) {
1377: sshkey_free(k);
1378: return ret;
1.1 djm 1379: }
1.127 djm 1380: /* success */
1381: *keyp = k;
1382: return 0;
1.1 djm 1383: }
1384:
1385: int
1386: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1387: {
1388: u_int i;
1389: const struct sshkey_cert *from;
1390: struct sshkey_cert *to;
1.67 djm 1391: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1392:
1.67 djm 1393: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1394: return SSH_ERR_INVALID_ARGUMENT;
1395:
1.67 djm 1396: if ((to = cert_new()) == NULL)
1.1 djm 1397: return SSH_ERR_ALLOC_FAIL;
1398:
1.67 djm 1399: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1400: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1401: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1402: goto out;
1.1 djm 1403:
1404: to->serial = from->serial;
1405: to->type = from->type;
1406: if (from->key_id == NULL)
1407: to->key_id = NULL;
1.67 djm 1408: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1409: r = SSH_ERR_ALLOC_FAIL;
1410: goto out;
1411: }
1.1 djm 1412: to->valid_after = from->valid_after;
1413: to->valid_before = from->valid_before;
1414: if (from->signature_key == NULL)
1415: to->signature_key = NULL;
1.67 djm 1416: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1417: &to->signature_key)) != 0)
1.67 djm 1418: goto out;
1419: if (from->signature_type != NULL &&
1420: (to->signature_type = strdup(from->signature_type)) == NULL) {
1421: r = SSH_ERR_ALLOC_FAIL;
1422: goto out;
1423: }
1424: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1425: r = SSH_ERR_INVALID_ARGUMENT;
1426: goto out;
1427: }
1.1 djm 1428: if (from->nprincipals > 0) {
1429: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1430: sizeof(*to->principals))) == NULL) {
1431: r = SSH_ERR_ALLOC_FAIL;
1432: goto out;
1433: }
1.1 djm 1434: for (i = 0; i < from->nprincipals; i++) {
1435: to->principals[i] = strdup(from->principals[i]);
1436: if (to->principals[i] == NULL) {
1437: to->nprincipals = i;
1.67 djm 1438: r = SSH_ERR_ALLOC_FAIL;
1439: goto out;
1.1 djm 1440: }
1441: }
1442: }
1443: to->nprincipals = from->nprincipals;
1.67 djm 1444:
1445: /* success */
1446: cert_free(to_key->cert);
1447: to_key->cert = to;
1448: to = NULL;
1449: r = 0;
1450: out:
1451: cert_free(to);
1452: return r;
1.1 djm 1453: }
1454:
1455: int
1.128 djm 1456: sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to)
1457: {
1458: /* Append security-key application string */
1459: if ((to->sk_application = strdup(from->sk_application)) == NULL)
1460: return SSH_ERR_ALLOC_FAIL;
1461: return 0;
1462: }
1463:
1464: int
1.1 djm 1465: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1466: {
1467: struct sshkey *n = NULL;
1.69 djm 1468: int r = SSH_ERR_INTERNAL_ERROR;
1.128 djm 1469: const struct sshkey_impl *impl;
1.1 djm 1470:
1.24 djm 1471: *pkp = NULL;
1.128 djm 1472: if ((impl = sshkey_impl_from_key(k)) == NULL)
1473: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.85 djm 1474: if ((n = sshkey_new(k->type)) == NULL) {
1475: r = SSH_ERR_ALLOC_FAIL;
1476: goto out;
1477: }
1.128 djm 1478: if ((r = impl->funcs->copy_public(k, n)) != 0)
1.69 djm 1479: goto out;
1480: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1481: goto out;
1482: /* success */
1.1 djm 1483: *pkp = n;
1.69 djm 1484: n = NULL;
1485: r = 0;
1486: out:
1487: sshkey_free(n);
1488: return r;
1.1 djm 1489: }
1490:
1.76 djm 1491: int
1492: sshkey_is_shielded(struct sshkey *k)
1493: {
1494: return k != NULL && k->shielded_private != NULL;
1495: }
1496:
1497: int
1498: sshkey_shield_private(struct sshkey *k)
1499: {
1500: struct sshbuf *prvbuf = NULL;
1501: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1502: struct sshcipher_ctx *cctx = NULL;
1503: const struct sshcipher *cipher;
1504: size_t i, enclen = 0;
1505: struct sshkey *kswap = NULL, tmp;
1506: int r = SSH_ERR_INTERNAL_ERROR;
1507:
1508: #ifdef DEBUG_PK
1509: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1510: #endif
1511: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1512: r = SSH_ERR_INVALID_ARGUMENT;
1513: goto out;
1514: }
1515: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1516: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1517: r = SSH_ERR_INTERNAL_ERROR;
1518: goto out;
1519: }
1520:
1521: /* Prepare a random pre-key, and from it an ephemeral key */
1522: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1523: r = SSH_ERR_ALLOC_FAIL;
1524: goto out;
1525: }
1526: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1527: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1528: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1529: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1530: goto out;
1531: #ifdef DEBUG_PK
1532: fprintf(stderr, "%s: key+iv\n", __func__);
1533: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1534: stderr);
1535: #endif
1536: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1537: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1538: goto out;
1539:
1540: /* Serialise and encrypt the private key using the ephemeral key */
1541: if ((prvbuf = sshbuf_new()) == NULL) {
1542: r = SSH_ERR_ALLOC_FAIL;
1543: goto out;
1544: }
1545: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1546: goto out;
1547: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.116 djm 1548: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 1549: goto out;
1550: /* pad to cipher blocksize */
1551: i = 0;
1552: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1553: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1554: goto out;
1555: }
1556: #ifdef DEBUG_PK
1557: fprintf(stderr, "%s: serialised\n", __func__);
1558: sshbuf_dump(prvbuf, stderr);
1559: #endif
1560: /* encrypt */
1561: enclen = sshbuf_len(prvbuf);
1562: if ((enc = malloc(enclen)) == NULL) {
1563: r = SSH_ERR_ALLOC_FAIL;
1564: goto out;
1565: }
1566: if ((r = cipher_crypt(cctx, 0, enc,
1567: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1568: goto out;
1569: #ifdef DEBUG_PK
1570: fprintf(stderr, "%s: encrypted\n", __func__);
1571: sshbuf_dump_data(enc, enclen, stderr);
1572: #endif
1573:
1574: /* Make a scrubbed, public-only copy of our private key argument */
1575: if ((r = sshkey_from_private(k, &kswap)) != 0)
1576: goto out;
1577:
1578: /* Swap the private key out (it will be destroyed below) */
1579: tmp = *kswap;
1580: *kswap = *k;
1581: *k = tmp;
1582:
1583: /* Insert the shielded key into our argument */
1584: k->shielded_private = enc;
1585: k->shielded_len = enclen;
1586: k->shield_prekey = prekey;
1587: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1588: enc = prekey = NULL; /* transferred */
1589: enclen = 0;
1.99 djm 1590:
1591: /* preserve key fields that are required for correct operation */
1592: k->sk_flags = kswap->sk_flags;
1.76 djm 1593:
1594: /* success */
1595: r = 0;
1596:
1597: out:
1598: /* XXX behaviour on error - invalidate original private key? */
1599: cipher_free(cctx);
1600: explicit_bzero(keyiv, sizeof(keyiv));
1601: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1602: freezero(enc, enclen);
1.76 djm 1603: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1604: sshkey_free(kswap);
1605: sshbuf_free(prvbuf);
1606: return r;
1607: }
1608:
1.121 djm 1609: /* Check deterministic padding after private key */
1610: static int
1611: private2_check_padding(struct sshbuf *decrypted)
1612: {
1613: u_char pad;
1614: size_t i;
1615: int r;
1616:
1617: i = 0;
1618: while (sshbuf_len(decrypted)) {
1619: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1620: goto out;
1621: if (pad != (++i & 0xff)) {
1622: r = SSH_ERR_INVALID_FORMAT;
1623: goto out;
1624: }
1625: }
1626: /* success */
1627: r = 0;
1628: out:
1629: explicit_bzero(&pad, sizeof(pad));
1630: explicit_bzero(&i, sizeof(i));
1631: return r;
1632: }
1633:
1.76 djm 1634: int
1635: sshkey_unshield_private(struct sshkey *k)
1636: {
1637: struct sshbuf *prvbuf = NULL;
1.121 djm 1638: u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1.76 djm 1639: struct sshcipher_ctx *cctx = NULL;
1640: const struct sshcipher *cipher;
1641: struct sshkey *kswap = NULL, tmp;
1642: int r = SSH_ERR_INTERNAL_ERROR;
1643:
1644: #ifdef DEBUG_PK
1645: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1646: #endif
1647: if (!sshkey_is_shielded(k))
1648: return 0; /* nothing to do */
1649:
1650: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1651: r = SSH_ERR_INVALID_ARGUMENT;
1652: goto out;
1653: }
1654: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1655: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1656: r = SSH_ERR_INTERNAL_ERROR;
1657: goto out;
1658: }
1659: /* check size of shielded key blob */
1660: if (k->shielded_len < cipher_blocksize(cipher) ||
1661: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1662: r = SSH_ERR_INVALID_FORMAT;
1663: goto out;
1664: }
1665:
1666: /* Calculate the ephemeral key from the prekey */
1667: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1668: k->shield_prekey, k->shield_prekey_len,
1669: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1670: goto out;
1671: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1672: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1673: goto out;
1674: #ifdef DEBUG_PK
1675: fprintf(stderr, "%s: key+iv\n", __func__);
1676: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1677: stderr);
1678: #endif
1679:
1680: /* Decrypt and parse the shielded private key using the ephemeral key */
1681: if ((prvbuf = sshbuf_new()) == NULL) {
1682: r = SSH_ERR_ALLOC_FAIL;
1683: goto out;
1684: }
1685: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
1686: goto out;
1687: /* decrypt */
1688: #ifdef DEBUG_PK
1689: fprintf(stderr, "%s: encrypted\n", __func__);
1690: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
1691: #endif
1692: if ((r = cipher_crypt(cctx, 0, cp,
1693: k->shielded_private, k->shielded_len, 0, 0)) != 0)
1694: goto out;
1695: #ifdef DEBUG_PK
1696: fprintf(stderr, "%s: serialised\n", __func__);
1697: sshbuf_dump(prvbuf, stderr);
1698: #endif
1699: /* Parse private key */
1700: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
1701: goto out;
1.121 djm 1702:
1703: if ((r = private2_check_padding(prvbuf)) != 0)
1704: goto out;
1.76 djm 1705:
1706: /* Swap the parsed key back into place */
1707: tmp = *kswap;
1708: *kswap = *k;
1709: *k = tmp;
1710:
1711: /* success */
1712: r = 0;
1713:
1714: out:
1715: cipher_free(cctx);
1716: explicit_bzero(keyiv, sizeof(keyiv));
1717: explicit_bzero(&tmp, sizeof(tmp));
1718: sshkey_free(kswap);
1719: sshbuf_free(prvbuf);
1720: return r;
1721: }
1722:
1.1 djm 1723: static int
1.14 djm 1724: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1725: {
1.14 djm 1726: struct sshbuf *principals = NULL, *crit = NULL;
1727: struct sshbuf *exts = NULL, *ca = NULL;
1728: u_char *sig = NULL;
1729: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1730: int ret = SSH_ERR_INTERNAL_ERROR;
1731:
1732: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1733: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1734: return ret;
1735:
1.20 djm 1736: /* Parse body of certificate up to signature */
1737: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1738: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1739: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1740: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1741: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1742: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1743: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1744: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1745: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1746: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1747: /* XXX debug print error for ret */
1748: ret = SSH_ERR_INVALID_FORMAT;
1749: goto out;
1750: }
1751:
1752: /* Signature is left in the buffer so we can calculate this length */
1753: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1754:
1755: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1756: ret = SSH_ERR_INVALID_FORMAT;
1757: goto out;
1758: }
1759:
1760: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1761: key->cert->type != SSH2_CERT_TYPE_HOST) {
1762: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1763: goto out;
1764: }
1765:
1.4 djm 1766: /* Parse principals section */
1767: while (sshbuf_len(principals) > 0) {
1768: char *principal = NULL;
1769: char **oprincipals = NULL;
1770:
1.1 djm 1771: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1772: ret = SSH_ERR_INVALID_FORMAT;
1773: goto out;
1774: }
1.4 djm 1775: if ((ret = sshbuf_get_cstring(principals, &principal,
1776: NULL)) != 0) {
1.1 djm 1777: ret = SSH_ERR_INVALID_FORMAT;
1778: goto out;
1779: }
1780: oprincipals = key->cert->principals;
1.51 deraadt 1781: key->cert->principals = recallocarray(key->cert->principals,
1782: key->cert->nprincipals, key->cert->nprincipals + 1,
1783: sizeof(*key->cert->principals));
1.1 djm 1784: if (key->cert->principals == NULL) {
1785: free(principal);
1786: key->cert->principals = oprincipals;
1787: ret = SSH_ERR_ALLOC_FAIL;
1788: goto out;
1789: }
1790: key->cert->principals[key->cert->nprincipals++] = principal;
1791: }
1792:
1.4 djm 1793: /*
1794: * Stash a copies of the critical options and extensions sections
1795: * for later use.
1796: */
1797: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1798: (exts != NULL &&
1799: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1800: goto out;
1801:
1.4 djm 1802: /*
1803: * Validate critical options and extensions sections format.
1804: */
1805: while (sshbuf_len(crit) != 0) {
1806: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1807: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1808: sshbuf_reset(key->cert->critical);
1.1 djm 1809: ret = SSH_ERR_INVALID_FORMAT;
1810: goto out;
1811: }
1812: }
1.4 djm 1813: while (exts != NULL && sshbuf_len(exts) != 0) {
1814: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1815: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1816: sshbuf_reset(key->cert->extensions);
1.1 djm 1817: ret = SSH_ERR_INVALID_FORMAT;
1818: goto out;
1819: }
1820: }
1821:
1.4 djm 1822: /* Parse CA key and check signature */
1.14 djm 1823: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1824: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1825: goto out;
1826: }
1827: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1828: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1829: goto out;
1830: }
1831: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 1832: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 1833: goto out;
1.82 djm 1834: if ((ret = sshkey_get_sigtype(sig, slen,
1835: &key->cert->signature_type)) != 0)
1.67 djm 1836: goto out;
1.4 djm 1837:
1838: /* Success */
1.1 djm 1839: ret = 0;
1840: out:
1.14 djm 1841: sshbuf_free(ca);
1.4 djm 1842: sshbuf_free(crit);
1843: sshbuf_free(exts);
1844: sshbuf_free(principals);
1.1 djm 1845: free(sig);
1846: return ret;
1847: }
1848:
1.122 djm 1849: int
1.129 djm 1850: sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key)
1.122 djm 1851: {
1.129 djm 1852: /* Parse additional security-key application string */
1853: if (sshbuf_get_cstring(b, &key->sk_application, NULL) != 0)
1854: return SSH_ERR_INVALID_FORMAT;
1.69 djm 1855: return 0;
1856: }
1857:
1858: static int
1.14 djm 1859: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1860: int allow_cert)
1.1 djm 1861: {
1.12 djm 1862: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.129 djm 1863: char *ktype = NULL;
1.1 djm 1864: struct sshkey *key = NULL;
1.14 djm 1865: struct sshbuf *copy;
1.129 djm 1866: const struct sshkey_impl *impl;
1.1 djm 1867:
1868: #ifdef DEBUG_PK /* XXX */
1.14 djm 1869: sshbuf_dump(b, stderr);
1.1 djm 1870: #endif
1.32 djm 1871: if (keyp != NULL)
1872: *keyp = NULL;
1.14 djm 1873: if ((copy = sshbuf_fromb(b)) == NULL) {
1874: ret = SSH_ERR_ALLOC_FAIL;
1875: goto out;
1876: }
1.1 djm 1877: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1878: ret = SSH_ERR_INVALID_FORMAT;
1879: goto out;
1880: }
1881:
1882: type = sshkey_type_from_name(ktype);
1883: if (!allow_cert && sshkey_type_is_cert(type)) {
1884: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1885: goto out;
1886: }
1.129 djm 1887: if ((impl = sshkey_impl_from_type(type)) == NULL) {
1888: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1889: goto out;
1890: }
1891: if ((key = sshkey_new(type)) == NULL) {
1892: ret = SSH_ERR_ALLOC_FAIL;
1893: goto out;
1894: }
1895: if (sshkey_type_is_cert(type)) {
1896: /* Skip nonce that preceeds all certificates */
1.1 djm 1897: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1898: ret = SSH_ERR_INVALID_FORMAT;
1899: goto out;
1900: }
1.129 djm 1901: }
1902: if ((ret = impl->funcs->deserialize_public(ktype, b, key)) != 0)
1.1 djm 1903: goto out;
1904:
1905: /* Parse certificate potion */
1.14 djm 1906: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 1907: goto out;
1908:
1909: if (key != NULL && sshbuf_len(b) != 0) {
1910: ret = SSH_ERR_INVALID_FORMAT;
1911: goto out;
1912: }
1913: ret = 0;
1.32 djm 1914: if (keyp != NULL) {
1915: *keyp = key;
1916: key = NULL;
1917: }
1.1 djm 1918: out:
1.14 djm 1919: sshbuf_free(copy);
1.1 djm 1920: sshkey_free(key);
1921: free(ktype);
1922: return ret;
1923: }
1924:
1925: int
1926: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
1927: {
1.14 djm 1928: struct sshbuf *b;
1929: int r;
1930:
1931: if ((b = sshbuf_from(blob, blen)) == NULL)
1932: return SSH_ERR_ALLOC_FAIL;
1933: r = sshkey_from_blob_internal(b, keyp, 1);
1934: sshbuf_free(b);
1935: return r;
1936: }
1937:
1938: int
1939: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
1940: {
1941: return sshkey_from_blob_internal(b, keyp, 1);
1942: }
1943:
1944: int
1945: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
1946: {
1947: struct sshbuf *b;
1948: int r;
1949:
1950: if ((r = sshbuf_froms(buf, &b)) != 0)
1951: return r;
1952: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 1953: sshbuf_free(b);
1954: return r;
1955: }
1956:
1.82 djm 1957: int
1958: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 1959: {
1960: int r;
1961: struct sshbuf *b = NULL;
1962: char *sigtype = NULL;
1963:
1964: if (sigtypep != NULL)
1965: *sigtypep = NULL;
1966: if ((b = sshbuf_from(sig, siglen)) == NULL)
1967: return SSH_ERR_ALLOC_FAIL;
1968: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
1969: goto out;
1970: /* success */
1971: if (sigtypep != NULL) {
1972: *sigtypep = sigtype;
1973: sigtype = NULL;
1974: }
1975: r = 0;
1976: out:
1977: free(sigtype);
1.14 djm 1978: sshbuf_free(b);
1979: return r;
1.68 djm 1980: }
1981:
1982: /*
1983: *
1984: * Checks whether a certificate's signature type is allowed.
1985: * Returns 0 (success) if the certificate signature type appears in the
1986: * "allowed" pattern-list, or the key is not a certificate to begin with.
1987: * Otherwise returns a ssherr.h code.
1988: */
1989: int
1990: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
1991: {
1992: if (key == NULL || allowed == NULL)
1993: return SSH_ERR_INVALID_ARGUMENT;
1994: if (!sshkey_type_is_cert(key->type))
1995: return 0;
1996: if (key->cert == NULL || key->cert->signature_type == NULL)
1997: return SSH_ERR_INVALID_ARGUMENT;
1998: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
1999: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2000: return 0;
1.65 djm 2001: }
2002:
2003: /*
2004: * Returns the expected signature algorithm for a given public key algorithm.
2005: */
1.66 djm 2006: const char *
2007: sshkey_sigalg_by_name(const char *name)
1.65 djm 2008: {
1.123 djm 2009: const struct sshkey_impl *impl;
2010: int i;
1.65 djm 2011:
1.123 djm 2012: for (i = 0; keyimpls[i] != NULL; i++) {
2013: impl = keyimpls[i];
2014: if (strcmp(impl->name, name) != 0)
1.65 djm 2015: continue;
1.123 djm 2016: if (impl->sigalg != NULL)
2017: return impl->sigalg;
2018: if (!impl->cert)
2019: return impl->name;
1.65 djm 2020: return sshkey_ssh_name_from_type_nid(
1.123 djm 2021: sshkey_type_plain(impl->type), impl->nid);
1.65 djm 2022: }
2023: return NULL;
2024: }
2025:
2026: /*
2027: * Verifies that the signature algorithm appearing inside the signature blob
2028: * matches that which was requested.
2029: */
2030: int
2031: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2032: const char *requested_alg)
2033: {
2034: const char *expected_alg;
2035: char *sigtype = NULL;
2036: int r;
2037:
2038: if (requested_alg == NULL)
2039: return 0;
1.66 djm 2040: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2041: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2042: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2043: return r;
2044: r = strcmp(expected_alg, sigtype) == 0;
2045: free(sigtype);
2046: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2047: }
2048:
2049: int
1.76 djm 2050: sshkey_sign(struct sshkey *key,
1.1 djm 2051: u_char **sigp, size_t *lenp,
1.86 djm 2052: const u_char *data, size_t datalen,
1.111 djm 2053: const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
1.1 djm 2054: {
1.76 djm 2055: int was_shielded = sshkey_is_shielded(key);
2056: int r2, r = SSH_ERR_INTERNAL_ERROR;
1.130 djm 2057: const struct sshkey_impl *impl;
1.76 djm 2058:
1.1 djm 2059: if (sigp != NULL)
2060: *sigp = NULL;
2061: if (lenp != NULL)
2062: *lenp = 0;
2063: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2064: return SSH_ERR_INVALID_ARGUMENT;
1.130 djm 2065: if ((impl = sshkey_impl_from_key(key)) == NULL)
2066: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.76 djm 2067: if ((r = sshkey_unshield_private(key)) != 0)
2068: return r;
1.130 djm 2069: if (sshkey_is_sk(key)) {
1.97 djm 2070: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.111 djm 2071: datalen, compat, sk_pin);
1.130 djm 2072: } else {
2073: if (impl->funcs->sign == NULL)
2074: r = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2075: else {
2076: r = impl->funcs->sign(key, sigp, lenp, data, datalen,
2077: alg, sk_provider, sk_pin, compat);
2078: }
1.1 djm 2079: }
1.76 djm 2080: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2081: return r2;
2082: return r;
1.1 djm 2083: }
2084:
2085: /*
2086: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2087: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2088: */
2089: int
2090: sshkey_verify(const struct sshkey *key,
2091: const u_char *sig, size_t siglen,
1.96 djm 2092: const u_char *data, size_t dlen, const char *alg, u_int compat,
2093: struct sshkey_sig_details **detailsp)
1.1 djm 2094: {
1.130 djm 2095: const struct sshkey_impl *impl;
2096:
1.96 djm 2097: if (detailsp != NULL)
2098: *detailsp = NULL;
1.6 djm 2099: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2100: return SSH_ERR_INVALID_ARGUMENT;
1.130 djm 2101: if ((impl = sshkey_impl_from_key(key)) == NULL)
1.1 djm 2102: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.130 djm 2103: return impl->funcs->verify(key, sig, siglen, data, dlen,
2104: alg, compat, detailsp);
1.1 djm 2105: }
2106:
2107: /* Convert a plain key to their _CERT equivalent */
2108: int
1.20 djm 2109: sshkey_to_certified(struct sshkey *k)
1.1 djm 2110: {
2111: int newtype;
2112:
1.131 djm 2113: if ((newtype = sshkey_type_certified(k->type)) == -1)
1.1 djm 2114: return SSH_ERR_INVALID_ARGUMENT;
2115: if ((k->cert = cert_new()) == NULL)
2116: return SSH_ERR_ALLOC_FAIL;
2117: k->type = newtype;
2118: return 0;
2119: }
2120:
2121: /* Convert a certificate to its raw key equivalent */
2122: int
2123: sshkey_drop_cert(struct sshkey *k)
2124: {
2125: if (!sshkey_type_is_cert(k->type))
2126: return SSH_ERR_KEY_TYPE_UNKNOWN;
2127: cert_free(k->cert);
2128: k->cert = NULL;
2129: k->type = sshkey_type_plain(k->type);
2130: return 0;
2131: }
2132:
2133: /* Sign a certified key, (re-)generating the signed certblob. */
2134: int
1.53 djm 2135: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2136: const char *sk_provider, const char *sk_pin,
2137: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2138: {
1.131 djm 2139: const struct sshkey_impl *impl;
1.1 djm 2140: struct sshbuf *principals = NULL;
2141: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2142: size_t i, ca_len, sig_len;
2143: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2144: struct sshbuf *cert = NULL;
2145: char *sigtype = NULL;
1.1 djm 2146:
2147: if (k == NULL || k->cert == NULL ||
2148: k->cert->certblob == NULL || ca == NULL)
2149: return SSH_ERR_INVALID_ARGUMENT;
2150: if (!sshkey_is_cert(k))
2151: return SSH_ERR_KEY_TYPE_UNKNOWN;
2152: if (!sshkey_type_is_valid_ca(ca->type))
2153: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1.131 djm 2154: if ((impl = sshkey_impl_from_key(k)) == NULL)
2155: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 2156:
1.67 djm 2157: /*
2158: * If no alg specified as argument but a signature_type was set,
2159: * then prefer that. If both were specified, then they must match.
2160: */
2161: if (alg == NULL)
2162: alg = k->cert->signature_type;
2163: else if (k->cert->signature_type != NULL &&
2164: strcmp(alg, k->cert->signature_type) != 0)
2165: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2166:
2167: /*
2168: * If no signing algorithm or signature_type was specified and we're
2169: * using a RSA key, then default to a good signature algorithm.
2170: */
2171: if (alg == NULL && ca->type == KEY_RSA)
2172: alg = "rsa-sha2-512";
1.67 djm 2173:
1.1 djm 2174: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2175: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2176:
2177: cert = k->cert->certblob; /* for readability */
2178: sshbuf_reset(cert);
2179: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2180: goto out;
2181:
2182: /* -v01 certs put nonce first */
2183: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2184: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2185: goto out;
1.1 djm 2186:
1.131 djm 2187: /* Public key next */
2188: if ((ret = impl->funcs->serialize_public(k, cert,
2189: SSHKEY_SERIALIZE_DEFAULT)) != 0)
1.15 djm 2190: goto out;
1.1 djm 2191:
1.131 djm 2192: /* Then remaining cert fields */
1.20 djm 2193: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2194: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2195: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2196: goto out;
2197:
2198: if ((principals = sshbuf_new()) == NULL) {
2199: ret = SSH_ERR_ALLOC_FAIL;
2200: goto out;
2201: }
2202: for (i = 0; i < k->cert->nprincipals; i++) {
2203: if ((ret = sshbuf_put_cstring(principals,
2204: k->cert->principals[i])) != 0)
2205: goto out;
2206: }
2207: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2208: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2209: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2210: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2211: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2212: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2213: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2214: goto out;
2215:
2216: /* Sign the whole mess */
1.53 djm 2217: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.111 djm 2218: sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
1.1 djm 2219: goto out;
1.67 djm 2220: /* Check and update signature_type against what was actually used */
1.82 djm 2221: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2222: goto out;
2223: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2224: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2225: goto out;
2226: }
2227: if (k->cert->signature_type == NULL) {
2228: k->cert->signature_type = sigtype;
2229: sigtype = NULL;
2230: }
1.1 djm 2231: /* Append signature and we are done */
2232: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2233: goto out;
2234: ret = 0;
2235: out:
2236: if (ret != 0)
2237: sshbuf_reset(cert);
1.29 mmcc 2238: free(sig_blob);
2239: free(ca_blob);
1.67 djm 2240: free(sigtype);
1.31 mmcc 2241: sshbuf_free(principals);
1.1 djm 2242: return ret;
1.53 djm 2243: }
2244:
2245: static int
1.76 djm 2246: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2247: const u_char *data, size_t datalen,
1.111 djm 2248: const char *alg, const char *sk_provider, const char *sk_pin,
2249: u_int compat, void *ctx)
1.53 djm 2250: {
2251: if (ctx != NULL)
2252: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2253: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
1.111 djm 2254: sk_provider, sk_pin, compat);
1.53 djm 2255: }
2256:
2257: int
1.86 djm 2258: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2259: const char *sk_provider, const char *sk_pin)
1.53 djm 2260: {
1.111 djm 2261: return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
1.86 djm 2262: default_key_sign, NULL);
1.1 djm 2263: }
2264:
2265: int
2266: sshkey_cert_check_authority(const struct sshkey *k,
1.114 djm 2267: int want_host, int require_principal, int wildcard_pattern,
1.119 djm 2268: uint64_t verify_time, const char *name, const char **reason)
1.1 djm 2269: {
2270: u_int i, principal_matches;
2271:
1.102 markus 2272: if (reason == NULL)
2273: return SSH_ERR_INVALID_ARGUMENT;
1.114 djm 2274: if (!sshkey_is_cert(k)) {
2275: *reason = "Key is not a certificate";
2276: return SSH_ERR_KEY_CERT_INVALID;
2277: }
1.1 djm 2278: if (want_host) {
2279: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2280: *reason = "Certificate invalid: not a host certificate";
2281: return SSH_ERR_KEY_CERT_INVALID;
2282: }
2283: } else {
2284: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2285: *reason = "Certificate invalid: not a user certificate";
2286: return SSH_ERR_KEY_CERT_INVALID;
2287: }
2288: }
1.119 djm 2289: if (verify_time < k->cert->valid_after) {
1.1 djm 2290: *reason = "Certificate invalid: not yet valid";
2291: return SSH_ERR_KEY_CERT_INVALID;
2292: }
1.119 djm 2293: if (verify_time >= k->cert->valid_before) {
1.1 djm 2294: *reason = "Certificate invalid: expired";
2295: return SSH_ERR_KEY_CERT_INVALID;
2296: }
2297: if (k->cert->nprincipals == 0) {
2298: if (require_principal) {
2299: *reason = "Certificate lacks principal list";
2300: return SSH_ERR_KEY_CERT_INVALID;
2301: }
2302: } else if (name != NULL) {
2303: principal_matches = 0;
2304: for (i = 0; i < k->cert->nprincipals; i++) {
1.114 djm 2305: if (wildcard_pattern) {
2306: if (match_pattern(k->cert->principals[i],
2307: name)) {
2308: principal_matches = 1;
2309: break;
2310: }
2311: } else if (strcmp(name, k->cert->principals[i]) == 0) {
1.1 djm 2312: principal_matches = 1;
2313: break;
2314: }
2315: }
2316: if (!principal_matches) {
2317: *reason = "Certificate invalid: name is not a listed "
2318: "principal";
2319: return SSH_ERR_KEY_CERT_INVALID;
2320: }
1.114 djm 2321: }
2322: return 0;
2323: }
2324:
2325: int
1.119 djm 2326: sshkey_cert_check_authority_now(const struct sshkey *k,
2327: int want_host, int require_principal, int wildcard_pattern,
2328: const char *name, const char **reason)
2329: {
2330: time_t now;
2331:
2332: if ((now = time(NULL)) < 0) {
2333: /* yikes - system clock before epoch! */
2334: *reason = "Certificate invalid: not yet valid";
2335: return SSH_ERR_KEY_CERT_INVALID;
2336: }
2337: return sshkey_cert_check_authority(k, want_host, require_principal,
2338: wildcard_pattern, (uint64_t)now, name, reason);
2339: }
2340:
2341: int
1.114 djm 2342: sshkey_cert_check_host(const struct sshkey *key, const char *host,
2343: int wildcard_principals, const char *ca_sign_algorithms,
2344: const char **reason)
2345: {
2346: int r;
2347:
1.119 djm 2348: if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
1.114 djm 2349: host, reason)) != 0)
2350: return r;
2351: if (sshbuf_len(key->cert->critical) != 0) {
2352: *reason = "Certificate contains unsupported critical options";
2353: return SSH_ERR_KEY_CERT_INVALID;
2354: }
2355: if (ca_sign_algorithms != NULL &&
2356: (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2357: *reason = "Certificate signed with disallowed algorithm";
2358: return SSH_ERR_KEY_CERT_INVALID;
1.1 djm 2359: }
2360: return 0;
1.27 djm 2361: }
2362:
2363: size_t
2364: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2365: {
1.113 dtucker 2366: char from[32], to[32], ret[128];
1.27 djm 2367:
2368: *from = *to = '\0';
2369: if (cert->valid_after == 0 &&
2370: cert->valid_before == 0xffffffffffffffffULL)
2371: return strlcpy(s, "forever", l);
2372:
1.118 dtucker 2373: if (cert->valid_after != 0)
2374: format_absolute_time(cert->valid_after, from, sizeof(from));
2375: if (cert->valid_before != 0xffffffffffffffffULL)
2376: format_absolute_time(cert->valid_before, to, sizeof(to));
1.27 djm 2377:
2378: if (cert->valid_after == 0)
2379: snprintf(ret, sizeof(ret), "before %s", to);
2380: else if (cert->valid_before == 0xffffffffffffffffULL)
2381: snprintf(ret, sizeof(ret), "after %s", from);
2382: else
2383: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2384:
2385: return strlcpy(s, ret, l);
1.1 djm 2386: }
2387:
1.132 djm 2388: /* Common serialization for FIDO private keys */
2389: int
2390: sshkey_serialize_private_sk(const struct sshkey *key, struct sshbuf *b)
2391: {
2392: int r;
2393:
2394: if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2395: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2396: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2397: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2398: return r;
2399:
2400: return 0;
2401: }
2402:
1.1 djm 2403: int
1.76 djm 2404: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2405: enum sshkey_serialize_rep opts)
1.1 djm 2406: {
2407: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2408: int was_shielded = sshkey_is_shielded(key);
2409: struct sshbuf *b = NULL;
1.132 djm 2410: const struct sshkey_impl *impl;
1.1 djm 2411:
1.132 djm 2412: if ((impl = sshkey_impl_from_key(key)) == NULL)
2413: return SSH_ERR_INTERNAL_ERROR;
1.76 djm 2414: if ((r = sshkey_unshield_private(key)) != 0)
2415: return r;
2416: if ((b = sshbuf_new()) == NULL)
2417: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2418: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2419: goto out;
1.132 djm 2420: if (sshkey_is_cert(key)) {
2421: if (key->cert == NULL ||
2422: sshbuf_len(key->cert->certblob) == 0) {
1.1 djm 2423: r = SSH_ERR_INVALID_ARGUMENT;
2424: goto out;
2425: }
1.132 djm 2426: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0)
1.1 djm 2427: goto out;
1.132 djm 2428: }
2429: if ((r = impl->funcs->serialize_private(key, b, opts)) != 0)
1.1 djm 2430: goto out;
1.132 djm 2431:
1.76 djm 2432: /*
2433: * success (but we still need to append the output to buf after
2434: * possibly re-shielding the private key)
2435: */
1.1 djm 2436: r = 0;
2437: out:
1.76 djm 2438: if (was_shielded)
2439: r = sshkey_shield_private(key);
2440: if (r == 0)
2441: r = sshbuf_putb(buf, b);
2442: sshbuf_free(b);
2443:
1.1 djm 2444: return r;
2445: }
2446:
2447: int
1.76 djm 2448: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 2449: {
2450: return sshkey_private_serialize_opt(key, b,
2451: SSHKEY_SERIALIZE_DEFAULT);
2452: }
2453:
1.133 djm 2454: /* Shared deserialization of FIDO private key components */
2455: int
2456: sshkey_private_deserialize_sk(struct sshbuf *buf, struct sshkey *k)
2457: {
2458: int r;
2459:
2460: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2461: (k->sk_reserved = sshbuf_new()) == NULL)
2462: return SSH_ERR_ALLOC_FAIL;
2463: if ((r = sshbuf_get_cstring(buf, &k->sk_application, NULL)) != 0 ||
2464: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2465: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2466: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2467: return r;
2468:
2469: return 0;
2470: }
2471:
1.62 markus 2472: int
1.1 djm 2473: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2474: {
1.133 djm 2475: const struct sshkey_impl *impl;
2476: char *tname = NULL;
1.115 djm 2477: char *expect_sk_application = NULL;
1.133 djm 2478: u_char *expect_ed25519_pk = NULL;
1.1 djm 2479: struct sshkey *k = NULL;
2480: int type, r = SSH_ERR_INTERNAL_ERROR;
2481:
2482: if (kp != NULL)
2483: *kp = NULL;
2484: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2485: goto out;
2486: type = sshkey_type_from_name(tname);
1.108 djm 2487: if (sshkey_type_is_cert(type)) {
2488: /*
2489: * Certificate key private keys begin with the certificate
2490: * itself. Make sure this matches the type of the enclosing
2491: * private key.
2492: */
2493: if ((r = sshkey_froms(buf, &k)) != 0)
2494: goto out;
2495: if (k->type != type) {
2496: r = SSH_ERR_KEY_CERT_MISMATCH;
2497: goto out;
2498: }
2499: /* For ECDSA keys, the group must match too */
2500: if (k->type == KEY_ECDSA &&
2501: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2502: r = SSH_ERR_KEY_CERT_MISMATCH;
2503: goto out;
2504: }
1.115 djm 2505: /*
2506: * Several fields are redundant between certificate and
2507: * private key body, we require these to match.
2508: */
2509: expect_sk_application = k->sk_application;
2510: expect_ed25519_pk = k->ed25519_pk;
2511: k->sk_application = NULL;
2512: k->ed25519_pk = NULL;
1.133 djm 2513: /* XXX xmss too or refactor */
1.108 djm 2514: } else {
1.70 djm 2515: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2516: r = SSH_ERR_ALLOC_FAIL;
2517: goto out;
2518: }
1.108 djm 2519: }
1.133 djm 2520: if ((impl = sshkey_impl_from_type(type)) == NULL) {
2521: r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 2522: goto out;
2523: }
1.133 djm 2524: if ((r = impl->funcs->deserialize_private(tname, buf, k)) != 0)
2525: goto out;
2526:
2527: /* XXX xmss too or refactor */
1.115 djm 2528: if ((expect_sk_application != NULL && (k->sk_application == NULL ||
2529: strcmp(expect_sk_application, k->sk_application) != 0)) ||
2530: (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
1.116 djm 2531: memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
1.115 djm 2532: r = SSH_ERR_KEY_CERT_MISMATCH;
2533: goto out;
2534: }
1.1 djm 2535: /* success */
2536: r = 0;
2537: if (kp != NULL) {
2538: *kp = k;
2539: k = NULL;
2540: }
2541: out:
2542: free(tname);
2543: sshkey_free(k);
1.115 djm 2544: free(expect_sk_application);
2545: free(expect_ed25519_pk);
1.1 djm 2546: return r;
2547: }
2548:
2549: #ifdef WITH_OPENSSL
2550: int
2551: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2552: {
2553: EC_POINT *nq = NULL;
1.93 djm 2554: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 2555: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2556:
2557: /*
2558: * NB. This assumes OpenSSL has already verified that the public
2559: * point lies on the curve. This is done by EC_POINT_oct2point()
2560: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2561: * reachable with public points not unmarshalled using
2562: * EC_POINT_oct2point then the caller will need to explicitly check.
2563: */
1.1 djm 2564:
2565: /*
2566: * We shouldn't ever hit this case because bignum_get_ecpoint()
2567: * refuses to load GF2m points.
2568: */
2569: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2570: NID_X9_62_prime_field)
2571: goto out;
2572:
2573: /* Q != infinity */
2574: if (EC_POINT_is_at_infinity(group, public))
2575: goto out;
2576:
1.93 djm 2577: if ((x = BN_new()) == NULL ||
2578: (y = BN_new()) == NULL ||
2579: (order = BN_new()) == NULL ||
2580: (tmp = BN_new()) == NULL) {
1.1 djm 2581: ret = SSH_ERR_ALLOC_FAIL;
2582: goto out;
2583: }
2584:
2585: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 2586: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 2587: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 2588: x, y, NULL) != 1) {
1.1 djm 2589: ret = SSH_ERR_LIBCRYPTO_ERROR;
2590: goto out;
2591: }
2592: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2593: BN_num_bits(y) <= BN_num_bits(order) / 2)
2594: goto out;
2595:
2596: /* nQ == infinity (n == order of subgroup) */
2597: if ((nq = EC_POINT_new(group)) == NULL) {
2598: ret = SSH_ERR_ALLOC_FAIL;
2599: goto out;
2600: }
1.93 djm 2601: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 2602: ret = SSH_ERR_LIBCRYPTO_ERROR;
2603: goto out;
2604: }
2605: if (EC_POINT_is_at_infinity(group, nq) != 1)
2606: goto out;
2607:
2608: /* x < order - 1, y < order - 1 */
2609: if (!BN_sub(tmp, order, BN_value_one())) {
2610: ret = SSH_ERR_LIBCRYPTO_ERROR;
2611: goto out;
2612: }
2613: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2614: goto out;
2615: ret = 0;
2616: out:
1.93 djm 2617: BN_clear_free(x);
2618: BN_clear_free(y);
2619: BN_clear_free(order);
2620: BN_clear_free(tmp);
1.60 jsing 2621: EC_POINT_free(nq);
1.1 djm 2622: return ret;
2623: }
2624:
2625: int
2626: sshkey_ec_validate_private(const EC_KEY *key)
2627: {
1.93 djm 2628: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 2629: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2630:
1.93 djm 2631: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 2632: ret = SSH_ERR_ALLOC_FAIL;
2633: goto out;
2634: }
2635:
2636: /* log2(private) > log2(order)/2 */
1.93 djm 2637: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 2638: ret = SSH_ERR_LIBCRYPTO_ERROR;
2639: goto out;
2640: }
2641: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2642: BN_num_bits(order) / 2)
2643: goto out;
2644:
2645: /* private < order - 1 */
2646: if (!BN_sub(tmp, order, BN_value_one())) {
2647: ret = SSH_ERR_LIBCRYPTO_ERROR;
2648: goto out;
2649: }
2650: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2651: goto out;
2652: ret = 0;
2653: out:
1.93 djm 2654: BN_clear_free(order);
2655: BN_clear_free(tmp);
1.1 djm 2656: return ret;
2657: }
2658:
2659: void
2660: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2661: {
1.93 djm 2662: BIGNUM *x = NULL, *y = NULL;
1.1 djm 2663:
2664: if (point == NULL) {
2665: fputs("point=(NULL)\n", stderr);
2666: return;
2667: }
1.93 djm 2668: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
2669: fprintf(stderr, "%s: BN_new failed\n", __func__);
2670: goto out;
1.1 djm 2671: }
2672: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2673: NID_X9_62_prime_field) {
2674: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 2675: goto out;
1.1 djm 2676: }
1.93 djm 2677: if (EC_POINT_get_affine_coordinates_GFp(group, point,
2678: x, y, NULL) != 1) {
1.1 djm 2679: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2680: __func__);
1.93 djm 2681: goto out;
1.1 djm 2682: }
2683: fputs("x=", stderr);
2684: BN_print_fp(stderr, x);
2685: fputs("\ny=", stderr);
2686: BN_print_fp(stderr, y);
2687: fputs("\n", stderr);
1.93 djm 2688: out:
2689: BN_clear_free(x);
2690: BN_clear_free(y);
1.1 djm 2691: }
2692:
2693: void
2694: sshkey_dump_ec_key(const EC_KEY *key)
2695: {
2696: const BIGNUM *exponent;
2697:
2698: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2699: EC_KEY_get0_public_key(key));
2700: fputs("exponent=", stderr);
2701: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2702: fputs("(NULL)", stderr);
2703: else
2704: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2705: fputs("\n", stderr);
2706: }
2707: #endif /* WITH_OPENSSL */
2708:
2709: static int
1.76 djm 2710: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 2711: const char *passphrase, const char *comment, const char *ciphername,
2712: int rounds)
2713: {
1.4 djm 2714: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2715: u_char salt[SALT_LEN];
2716: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2717: u_int check;
2718: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 2719: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 2720: const struct sshcipher *cipher;
2721: const char *kdfname = KDFNAME;
2722: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2723:
2724: if (rounds <= 0)
2725: rounds = DEFAULT_ROUNDS;
2726: if (passphrase == NULL || !strlen(passphrase)) {
2727: ciphername = "none";
2728: kdfname = "none";
2729: } else if (ciphername == NULL)
2730: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 2731: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 2732: r = SSH_ERR_INVALID_ARGUMENT;
2733: goto out;
2734: }
2735:
2736: if ((kdf = sshbuf_new()) == NULL ||
2737: (encoded = sshbuf_new()) == NULL ||
2738: (encrypted = sshbuf_new()) == NULL) {
2739: r = SSH_ERR_ALLOC_FAIL;
2740: goto out;
2741: }
2742: blocksize = cipher_blocksize(cipher);
2743: keylen = cipher_keylen(cipher);
2744: ivlen = cipher_ivlen(cipher);
2745: authlen = cipher_authlen(cipher);
2746: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2747: r = SSH_ERR_ALLOC_FAIL;
2748: goto out;
2749: }
2750: if (strcmp(kdfname, "bcrypt") == 0) {
2751: arc4random_buf(salt, SALT_LEN);
2752: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2753: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2754: r = SSH_ERR_INVALID_ARGUMENT;
2755: goto out;
2756: }
2757: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2758: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2759: goto out;
2760: } else if (strcmp(kdfname, "none") != 0) {
2761: /* Unsupported KDF type */
2762: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2763: goto out;
2764: }
2765: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2766: key + keylen, ivlen, 1)) != 0)
2767: goto out;
2768:
2769: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
2770: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
2771: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
2772: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
2773: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
2774: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
2775: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
2776: goto out;
2777:
2778: /* set up the buffer that will be encrypted */
2779:
2780: /* Random check bytes */
2781: check = arc4random();
2782: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
2783: (r = sshbuf_put_u32(encrypted, check)) != 0)
2784: goto out;
2785:
2786: /* append private key and comment*/
1.62 markus 2787: if ((r = sshkey_private_serialize_opt(prv, encrypted,
1.116 djm 2788: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 2789: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
2790: goto out;
2791:
2792: /* padding */
2793: i = 0;
2794: while (sshbuf_len(encrypted) % blocksize) {
2795: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
2796: goto out;
2797: }
2798:
2799: /* length in destination buffer */
2800: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
2801: goto out;
2802:
2803: /* encrypt */
2804: if ((r = sshbuf_reserve(encoded,
2805: sshbuf_len(encrypted) + authlen, &cp)) != 0)
2806: goto out;
1.36 djm 2807: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 2808: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
2809: goto out;
2810:
1.81 djm 2811: sshbuf_reset(blob);
1.1 djm 2812:
1.81 djm 2813: /* assemble uuencoded key */
2814: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
2815: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
2816: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 2817: goto out;
2818:
2819: /* success */
2820: r = 0;
2821:
2822: out:
2823: sshbuf_free(kdf);
2824: sshbuf_free(encoded);
2825: sshbuf_free(encrypted);
1.36 djm 2826: cipher_free(ciphercontext);
1.1 djm 2827: explicit_bzero(salt, sizeof(salt));
1.100 jsg 2828: if (key != NULL)
2829: freezero(key, keylen + ivlen);
1.121 djm 2830: if (pubkeyblob != NULL)
1.100 jsg 2831: freezero(pubkeyblob, pubkeylen);
1.1 djm 2832: return r;
2833: }
2834:
2835: static int
1.103 djm 2836: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 2837: {
2838: const u_char *cp;
2839: size_t encoded_len;
1.103 djm 2840: int r;
2841: u_char last;
1.1 djm 2842: struct sshbuf *encoded = NULL, *decoded = NULL;
2843:
1.103 djm 2844: if (blob == NULL || decodedp == NULL)
2845: return SSH_ERR_INVALID_ARGUMENT;
2846:
2847: *decodedp = NULL;
1.1 djm 2848:
2849: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 2850: (decoded = sshbuf_new()) == NULL) {
1.1 djm 2851: r = SSH_ERR_ALLOC_FAIL;
2852: goto out;
2853: }
2854:
2855: /* check preamble */
2856: cp = sshbuf_ptr(blob);
2857: encoded_len = sshbuf_len(blob);
2858: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
2859: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
2860: r = SSH_ERR_INVALID_FORMAT;
2861: goto out;
2862: }
2863: cp += MARK_BEGIN_LEN;
2864: encoded_len -= MARK_BEGIN_LEN;
2865:
2866: /* Look for end marker, removing whitespace as we go */
2867: while (encoded_len > 0) {
2868: if (*cp != '\n' && *cp != '\r') {
2869: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
2870: goto out;
2871: }
2872: last = *cp;
2873: encoded_len--;
2874: cp++;
2875: if (last == '\n') {
2876: if (encoded_len >= MARK_END_LEN &&
2877: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
2878: /* \0 terminate */
2879: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
2880: goto out;
2881: break;
2882: }
2883: }
2884: }
2885: if (encoded_len == 0) {
2886: r = SSH_ERR_INVALID_FORMAT;
2887: goto out;
2888: }
2889:
2890: /* decode base64 */
1.4 djm 2891: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 2892: goto out;
2893:
2894: /* check magic */
2895: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
2896: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
2897: r = SSH_ERR_INVALID_FORMAT;
2898: goto out;
2899: }
1.103 djm 2900: /* success */
2901: *decodedp = decoded;
2902: decoded = NULL;
2903: r = 0;
2904: out:
2905: sshbuf_free(encoded);
2906: sshbuf_free(decoded);
2907: return r;
2908: }
2909:
2910: static int
1.104 djm 2911: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
2912: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 2913: {
2914: char *ciphername = NULL, *kdfname = NULL;
2915: const struct sshcipher *cipher = NULL;
2916: int r = SSH_ERR_INTERNAL_ERROR;
2917: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
2918: struct sshbuf *kdf = NULL, *decrypted = NULL;
2919: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 2920: struct sshkey *pubkey = NULL;
1.103 djm 2921: u_char *key = NULL, *salt = NULL, *dp;
2922: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
2923:
1.104 djm 2924: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 2925: return SSH_ERR_INVALID_ARGUMENT;
2926:
2927: *decryptedp = NULL;
1.104 djm 2928: *pubkeyp = NULL;
1.103 djm 2929:
2930: if ((decrypted = sshbuf_new()) == NULL) {
2931: r = SSH_ERR_ALLOC_FAIL;
2932: goto out;
2933: }
2934:
1.1 djm 2935: /* parse public portion of key */
2936: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
2937: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
2938: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
2939: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 2940: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
2941: goto out;
2942:
2943: if (nkeys != 1) {
2944: /* XXX only one key supported at present */
2945: r = SSH_ERR_INVALID_FORMAT;
2946: goto out;
2947: }
2948:
1.104 djm 2949: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 2950: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
2951: goto out;
2952:
2953: if ((cipher = cipher_by_name(ciphername)) == NULL) {
2954: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2955: goto out;
2956: }
2957: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
2958: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2959: goto out;
2960: }
1.101 markus 2961: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 2962: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 2963: goto out;
2964: }
2965: if ((passphrase == NULL || strlen(passphrase) == 0) &&
2966: strcmp(kdfname, "none") != 0) {
2967: /* passphrase required */
2968: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 2969: goto out;
2970: }
2971:
2972: /* check size of encrypted key blob */
2973: blocksize = cipher_blocksize(cipher);
2974: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
2975: r = SSH_ERR_INVALID_FORMAT;
2976: goto out;
2977: }
2978:
2979: /* setup key */
2980: keylen = cipher_keylen(cipher);
2981: ivlen = cipher_ivlen(cipher);
1.18 djm 2982: authlen = cipher_authlen(cipher);
1.1 djm 2983: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2984: r = SSH_ERR_ALLOC_FAIL;
2985: goto out;
2986: }
2987: if (strcmp(kdfname, "bcrypt") == 0) {
2988: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
2989: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
2990: goto out;
2991: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
2992: key, keylen + ivlen, rounds) < 0) {
2993: r = SSH_ERR_INVALID_FORMAT;
2994: goto out;
2995: }
2996: }
2997:
1.18 djm 2998: /* check that an appropriate amount of auth data is present */
1.84 djm 2999: if (sshbuf_len(decoded) < authlen ||
3000: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 3001: r = SSH_ERR_INVALID_FORMAT;
3002: goto out;
3003: }
3004:
1.1 djm 3005: /* decrypt private portion of key */
3006: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3007: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3008: key + keylen, ivlen, 0)) != 0)
3009: goto out;
1.36 djm 3010: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3011: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3012: /* an integrity error here indicates an incorrect passphrase */
3013: if (r == SSH_ERR_MAC_INVALID)
3014: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3015: goto out;
3016: }
1.18 djm 3017: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3018: goto out;
3019: /* there should be no trailing data */
3020: if (sshbuf_len(decoded) != 0) {
3021: r = SSH_ERR_INVALID_FORMAT;
3022: goto out;
3023: }
3024:
3025: /* check check bytes */
3026: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3027: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3028: goto out;
3029: if (check1 != check2) {
3030: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3031: goto out;
3032: }
1.103 djm 3033: /* success */
3034: *decryptedp = decrypted;
3035: decrypted = NULL;
1.104 djm 3036: *pubkeyp = pubkey;
3037: pubkey = NULL;
1.103 djm 3038: r = 0;
3039: out:
3040: cipher_free(ciphercontext);
3041: free(ciphername);
3042: free(kdfname);
1.104 djm 3043: sshkey_free(pubkey);
1.103 djm 3044: if (salt != NULL) {
3045: explicit_bzero(salt, slen);
3046: free(salt);
3047: }
3048: if (key != NULL) {
3049: explicit_bzero(key, keylen + ivlen);
3050: free(key);
3051: }
3052: sshbuf_free(kdf);
3053: sshbuf_free(decrypted);
3054: return r;
3055: }
3056:
3057: static int
3058: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3059: struct sshkey **keyp, char **commentp)
3060: {
3061: char *comment = NULL;
3062: int r = SSH_ERR_INTERNAL_ERROR;
3063: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 3064: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 3065:
3066: if (keyp != NULL)
3067: *keyp = NULL;
3068: if (commentp != NULL)
3069: *commentp = NULL;
3070:
3071: /* Undo base64 encoding and decrypt the private section */
3072: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 3073: (r = private2_decrypt(decoded, passphrase,
3074: &decrypted, &pubkey)) != 0)
1.103 djm 3075: goto out;
1.105 djm 3076:
3077: if (type != KEY_UNSPEC &&
3078: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3079: r = SSH_ERR_KEY_TYPE_MISMATCH;
3080: goto out;
3081: }
1.103 djm 3082:
3083: /* Load the private key and comment */
3084: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3085: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3086: goto out;
3087:
3088: /* Check deterministic padding after private section */
3089: if ((r = private2_check_padding(decrypted)) != 0)
3090: goto out;
1.1 djm 3091:
1.104 djm 3092: /* Check that the public key in the envelope matches the private key */
3093: if (!sshkey_equal(pubkey, k)) {
3094: r = SSH_ERR_INVALID_FORMAT;
3095: goto out;
3096: }
1.1 djm 3097:
3098: /* success */
3099: r = 0;
3100: if (keyp != NULL) {
3101: *keyp = k;
3102: k = NULL;
3103: }
3104: if (commentp != NULL) {
3105: *commentp = comment;
3106: comment = NULL;
3107: }
3108: out:
3109: free(comment);
3110: sshbuf_free(decoded);
3111: sshbuf_free(decrypted);
3112: sshkey_free(k);
1.104 djm 3113: sshkey_free(pubkey);
1.1 djm 3114: return r;
3115: }
3116:
1.107 djm 3117: static int
3118: sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3119: struct sshkey **keyp)
3120: {
3121: int r = SSH_ERR_INTERNAL_ERROR;
3122: struct sshbuf *decoded = NULL;
3123: struct sshkey *pubkey = NULL;
3124: u_int nkeys = 0;
3125:
3126: if (keyp != NULL)
3127: *keyp = NULL;
3128:
3129: if ((r = private2_uudecode(blob, &decoded)) != 0)
3130: goto out;
3131: /* parse public key from unencrypted envelope */
3132: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3133: (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
3134: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
3135: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
3136: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3137: goto out;
3138:
3139: if (nkeys != 1) {
3140: /* XXX only one key supported at present */
3141: r = SSH_ERR_INVALID_FORMAT;
3142: goto out;
3143: }
3144:
3145: /* Parse the public key */
3146: if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3147: goto out;
3148:
3149: if (type != KEY_UNSPEC &&
3150: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3151: r = SSH_ERR_KEY_TYPE_MISMATCH;
3152: goto out;
3153: }
3154:
3155: /* success */
3156: r = 0;
3157: if (keyp != NULL) {
3158: *keyp = pubkey;
3159: pubkey = NULL;
3160: }
3161: out:
3162: sshbuf_free(decoded);
3163: sshkey_free(pubkey);
3164: return r;
3165: }
3166:
1.1 djm 3167: #ifdef WITH_OPENSSL
1.80 djm 3168: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3169: static int
1.80 djm 3170: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3171: int format, const char *_passphrase, const char *comment)
1.1 djm 3172: {
1.76 djm 3173: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3174: int success, r;
3175: int blen, len = strlen(_passphrase);
3176: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3177: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3178: char *bptr;
1.1 djm 3179: BIO *bio = NULL;
1.76 djm 3180: struct sshbuf *blob;
1.80 djm 3181: EVP_PKEY *pkey = NULL;
1.1 djm 3182:
3183: if (len > 0 && len <= 4)
3184: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3185: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3186: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3187: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3188: r = SSH_ERR_ALLOC_FAIL;
3189: goto out;
3190: }
3191: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3192: r = SSH_ERR_ALLOC_FAIL;
3193: goto out;
1.76 djm 3194: }
3195: if ((r = sshkey_unshield_private(key)) != 0)
3196: goto out;
1.1 djm 3197:
3198: switch (key->type) {
3199: case KEY_DSA:
1.80 djm 3200: if (format == SSHKEY_PRIVATE_PEM) {
3201: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3202: cipher, passphrase, len, NULL, NULL);
3203: } else {
3204: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3205: }
1.1 djm 3206: break;
3207: case KEY_ECDSA:
1.80 djm 3208: if (format == SSHKEY_PRIVATE_PEM) {
3209: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3210: cipher, passphrase, len, NULL, NULL);
3211: } else {
3212: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3213: }
1.1 djm 3214: break;
3215: case KEY_RSA:
1.80 djm 3216: if (format == SSHKEY_PRIVATE_PEM) {
3217: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3218: cipher, passphrase, len, NULL, NULL);
3219: } else {
3220: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3221: }
1.1 djm 3222: break;
3223: default:
3224: success = 0;
3225: break;
3226: }
3227: if (success == 0) {
3228: r = SSH_ERR_LIBCRYPTO_ERROR;
3229: goto out;
3230: }
1.80 djm 3231: if (format == SSHKEY_PRIVATE_PKCS8) {
3232: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3233: passphrase, len, NULL, NULL)) == 0) {
3234: r = SSH_ERR_LIBCRYPTO_ERROR;
3235: goto out;
3236: }
3237: }
1.1 djm 3238: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3239: r = SSH_ERR_INTERNAL_ERROR;
3240: goto out;
3241: }
3242: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3243: goto out;
3244: r = 0;
3245: out:
1.76 djm 3246: if (was_shielded)
3247: r = sshkey_shield_private(key);
3248: if (r == 0)
3249: r = sshbuf_putb(buf, blob);
1.80 djm 3250:
3251: EVP_PKEY_free(pkey);
1.76 djm 3252: sshbuf_free(blob);
1.1 djm 3253: BIO_free(bio);
3254: return r;
3255: }
3256: #endif /* WITH_OPENSSL */
3257:
3258: /* Serialise "key" to buffer "blob" */
3259: int
3260: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3261: const char *passphrase, const char *comment,
1.80 djm 3262: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 3263: {
3264: switch (key->type) {
1.9 markus 3265: #ifdef WITH_OPENSSL
1.1 djm 3266: case KEY_DSA:
3267: case KEY_ECDSA:
3268: case KEY_RSA:
1.80 djm 3269: break; /* see below */
1.1 djm 3270: #endif /* WITH_OPENSSL */
3271: case KEY_ED25519:
1.90 markus 3272: case KEY_ED25519_SK:
1.62 markus 3273: #ifdef WITH_XMSS
3274: case KEY_XMSS:
3275: #endif /* WITH_XMSS */
1.85 djm 3276: #ifdef WITH_OPENSSL
3277: case KEY_ECDSA_SK:
3278: #endif /* WITH_OPENSSL */
1.1 djm 3279: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 3280: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 3281: default:
3282: return SSH_ERR_KEY_TYPE_UNKNOWN;
3283: }
1.80 djm 3284:
3285: #ifdef WITH_OPENSSL
3286: switch (format) {
3287: case SSHKEY_PRIVATE_OPENSSH:
3288: return sshkey_private_to_blob2(key, blob, passphrase,
3289: comment, openssh_format_cipher, openssh_format_rounds);
3290: case SSHKEY_PRIVATE_PEM:
3291: case SSHKEY_PRIVATE_PKCS8:
3292: return sshkey_private_to_blob_pem_pkcs8(key, blob,
3293: format, passphrase, comment);
3294: default:
3295: return SSH_ERR_INVALID_ARGUMENT;
3296: }
3297: #endif /* WITH_OPENSSL */
1.1 djm 3298: }
3299:
3300: #ifdef WITH_OPENSSL
1.8 djm 3301: static int
1.52 djm 3302: translate_libcrypto_error(unsigned long pem_err)
3303: {
3304: int pem_reason = ERR_GET_REASON(pem_err);
3305:
3306: switch (ERR_GET_LIB(pem_err)) {
3307: case ERR_LIB_PEM:
3308: switch (pem_reason) {
3309: case PEM_R_BAD_PASSWORD_READ:
3310: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3311: case PEM_R_BAD_DECRYPT:
3312: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3313: default:
3314: return SSH_ERR_INVALID_FORMAT;
3315: }
3316: case ERR_LIB_EVP:
3317: switch (pem_reason) {
3318: case EVP_R_BAD_DECRYPT:
3319: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3320: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3321: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3322: #endif
1.52 djm 3323: case EVP_R_DECODE_ERROR:
3324: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3325: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3326: #endif
3327: return SSH_ERR_INVALID_FORMAT;
3328: default:
3329: return SSH_ERR_LIBCRYPTO_ERROR;
3330: }
3331: case ERR_LIB_ASN1:
3332: return SSH_ERR_INVALID_FORMAT;
3333: }
3334: return SSH_ERR_LIBCRYPTO_ERROR;
3335: }
3336:
3337: static void
3338: clear_libcrypto_errors(void)
3339: {
3340: while (ERR_get_error() != 0)
3341: ;
3342: }
3343:
3344: /*
3345: * Translate OpenSSL error codes to determine whether
3346: * passphrase is required/incorrect.
3347: */
3348: static int
3349: convert_libcrypto_error(void)
3350: {
3351: /*
3352: * Some password errors are reported at the beginning
3353: * of the error queue.
3354: */
3355: if (translate_libcrypto_error(ERR_peek_error()) ==
3356: SSH_ERR_KEY_WRONG_PASSPHRASE)
3357: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3358: return translate_libcrypto_error(ERR_peek_last_error());
3359: }
3360:
3361: static int
1.1 djm 3362: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3363: const char *passphrase, struct sshkey **keyp)
1.1 djm 3364: {
3365: EVP_PKEY *pk = NULL;
3366: struct sshkey *prv = NULL;
3367: BIO *bio = NULL;
3368: int r;
3369:
1.32 djm 3370: if (keyp != NULL)
3371: *keyp = NULL;
1.1 djm 3372:
3373: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3374: return SSH_ERR_ALLOC_FAIL;
3375: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3376: (int)sshbuf_len(blob)) {
3377: r = SSH_ERR_ALLOC_FAIL;
3378: goto out;
3379: }
3380:
1.52 djm 3381: clear_libcrypto_errors();
1.1 djm 3382: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3383: (char *)passphrase)) == NULL) {
1.116 djm 3384: /*
3385: * libcrypto may return various ASN.1 errors when attempting
3386: * to parse a key with an incorrect passphrase.
3387: * Treat all format errors as "incorrect passphrase" if a
3388: * passphrase was supplied.
3389: */
1.71 djm 3390: if (passphrase != NULL && *passphrase != '\0')
3391: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3392: else
3393: r = convert_libcrypto_error();
1.1 djm 3394: goto out;
3395: }
1.69 djm 3396: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3397: (type == KEY_UNSPEC || type == KEY_RSA)) {
3398: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3399: r = SSH_ERR_ALLOC_FAIL;
3400: goto out;
3401: }
3402: prv->rsa = EVP_PKEY_get1_RSA(pk);
3403: prv->type = KEY_RSA;
3404: #ifdef DEBUG_PK
3405: RSA_print_fp(stderr, prv->rsa, 8);
3406: #endif
3407: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3408: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3409: goto out;
3410: }
1.122 djm 3411: if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
1.1 djm 3412: goto out;
1.69 djm 3413: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3414: (type == KEY_UNSPEC || type == KEY_DSA)) {
3415: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3416: r = SSH_ERR_ALLOC_FAIL;
3417: goto out;
3418: }
3419: prv->dsa = EVP_PKEY_get1_DSA(pk);
3420: prv->type = KEY_DSA;
3421: #ifdef DEBUG_PK
3422: DSA_print_fp(stderr, prv->dsa, 8);
3423: #endif
1.69 djm 3424: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3425: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3426: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3427: r = SSH_ERR_ALLOC_FAIL;
3428: goto out;
3429: }
3430: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3431: prv->type = KEY_ECDSA;
3432: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3433: if (prv->ecdsa_nid == -1 ||
3434: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3435: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3436: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3437: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3438: r = SSH_ERR_INVALID_FORMAT;
3439: goto out;
3440: }
3441: #ifdef DEBUG_PK
3442: if (prv != NULL && prv->ecdsa != NULL)
3443: sshkey_dump_ec_key(prv->ecdsa);
3444: #endif
3445: } else {
3446: r = SSH_ERR_INVALID_FORMAT;
3447: goto out;
3448: }
3449: r = 0;
1.32 djm 3450: if (keyp != NULL) {
3451: *keyp = prv;
3452: prv = NULL;
3453: }
1.1 djm 3454: out:
3455: BIO_free(bio);
1.60 jsing 3456: EVP_PKEY_free(pk);
1.30 mmcc 3457: sshkey_free(prv);
1.1 djm 3458: return r;
3459: }
3460: #endif /* WITH_OPENSSL */
3461:
3462: int
3463: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3464: const char *passphrase, struct sshkey **keyp, char **commentp)
3465: {
1.42 djm 3466: int r = SSH_ERR_INTERNAL_ERROR;
3467:
1.32 djm 3468: if (keyp != NULL)
3469: *keyp = NULL;
1.1 djm 3470: if (commentp != NULL)
3471: *commentp = NULL;
3472:
3473: switch (type) {
3474: case KEY_ED25519:
1.62 markus 3475: case KEY_XMSS:
1.106 djm 3476: /* No fallback for new-format-only keys */
1.1 djm 3477: return sshkey_parse_private2(blob, type, passphrase,
3478: keyp, commentp);
1.106 djm 3479: default:
1.42 djm 3480: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3481: commentp);
1.106 djm 3482: /* Only fallback to PEM parser if a format error occurred. */
3483: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 3484: return r;
1.1 djm 3485: #ifdef WITH_OPENSSL
1.8 djm 3486: return sshkey_parse_private_pem_fileblob(blob, type,
3487: passphrase, keyp);
1.1 djm 3488: #else
3489: return SSH_ERR_INVALID_FORMAT;
3490: #endif /* WITH_OPENSSL */
3491: }
3492: }
3493:
3494: int
3495: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3496: struct sshkey **keyp, char **commentp)
1.1 djm 3497: {
3498: if (keyp != NULL)
3499: *keyp = NULL;
3500: if (commentp != NULL)
3501: *commentp = NULL;
3502:
1.23 tim 3503: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3504: passphrase, keyp, commentp);
1.96 djm 3505: }
3506:
3507: void
3508: sshkey_sig_details_free(struct sshkey_sig_details *details)
3509: {
3510: freezero(details, sizeof(*details));
1.107 djm 3511: }
3512:
3513: int
3514: sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
3515: struct sshkey **pubkeyp)
3516: {
3517: int r = SSH_ERR_INTERNAL_ERROR;
3518:
3519: if (pubkeyp != NULL)
3520: *pubkeyp = NULL;
3521: /* only new-format private keys bundle a public key inside */
3522: if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
3523: return r;
3524: return 0;
1.1 djm 3525: }
1.62 markus 3526:
3527: #ifdef WITH_XMSS
3528: /*
3529: * serialize the key with the current state and forward the state
3530: * maxsign times.
3531: */
3532: int
1.77 djm 3533: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3534: u_int32_t maxsign, int printerror)
1.62 markus 3535: {
3536: int r, rupdate;
3537:
3538: if (maxsign == 0 ||
3539: sshkey_type_plain(k->type) != KEY_XMSS)
3540: return sshkey_private_serialize_opt(k, b,
3541: SSHKEY_SERIALIZE_DEFAULT);
1.112 dtucker 3542: if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
1.62 markus 3543: (r = sshkey_private_serialize_opt(k, b,
3544: SSHKEY_SERIALIZE_STATE)) != 0 ||
3545: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3546: goto out;
3547: r = 0;
3548: out:
1.112 dtucker 3549: if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
1.62 markus 3550: if (r == 0)
3551: r = rupdate;
3552: }
3553: return r;
3554: }
3555:
3556: u_int32_t
3557: sshkey_signatures_left(const struct sshkey *k)
3558: {
3559: if (sshkey_type_plain(k->type) == KEY_XMSS)
3560: return sshkey_xmss_signatures_left(k);
3561: return 0;
3562: }
3563:
3564: int
3565: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3566: {
3567: if (sshkey_type_plain(k->type) != KEY_XMSS)
3568: return SSH_ERR_INVALID_ARGUMENT;
3569: return sshkey_xmss_enable_maxsign(k, maxsign);
3570: }
3571:
3572: int
3573: sshkey_set_filename(struct sshkey *k, const char *filename)
3574: {
3575: if (k == NULL)
3576: return SSH_ERR_INVALID_ARGUMENT;
3577: if (sshkey_type_plain(k->type) != KEY_XMSS)
3578: return 0;
3579: if (filename == NULL)
3580: return SSH_ERR_INVALID_ARGUMENT;
3581: if ((k->xmss_filename = strdup(filename)) == NULL)
3582: return SSH_ERR_ALLOC_FAIL;
3583: return 0;
3584: }
3585: #else
3586: int
1.76 djm 3587: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3588: u_int32_t maxsign, int printerror)
1.62 markus 3589: {
3590: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
3591: }
3592:
3593: u_int32_t
3594: sshkey_signatures_left(const struct sshkey *k)
3595: {
3596: return 0;
3597: }
3598:
3599: int
3600: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3601: {
3602: return SSH_ERR_INVALID_ARGUMENT;
3603: }
3604:
3605: int
3606: sshkey_set_filename(struct sshkey *k, const char *filename)
3607: {
3608: if (k == NULL)
3609: return SSH_ERR_INVALID_ARGUMENT;
3610: return 0;
3611: }
3612: #endif /* WITH_XMSS */
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