Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.131
1.131 ! djm 1: /* $OpenBSD: sshkey.c,v 1.130 2022/10/28 00:43:08 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
1.11 djm 322: sshkey_names_valid2(const char *names, int allow_wildcard)
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: }
1.1 djm 353: free(s);
354: return 0;
355: }
356: }
357: free(s);
358: return 1;
359: }
360:
361: u_int
362: sshkey_size(const struct sshkey *k)
363: {
1.123 djm 364: const struct sshkey_impl *impl;
1.69 djm 365:
1.126 djm 366: if ((impl = sshkey_impl_from_key(k)) == NULL)
1.123 djm 367: return 0;
368: if (impl->funcs->size != NULL)
369: return impl->funcs->size(k);
370: return impl->keybits;
1.1 djm 371: }
372:
373: static int
374: sshkey_type_is_valid_ca(int type)
375: {
1.123 djm 376: const struct sshkey_impl *impl;
377:
378: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 379: return 0;
1.123 djm 380: /* All non-certificate types may act as CAs */
381: return !impl->cert;
1.1 djm 382: }
383:
384: int
385: sshkey_is_cert(const struct sshkey *k)
386: {
387: if (k == NULL)
388: return 0;
389: return sshkey_type_is_cert(k->type);
390: }
391:
1.90 markus 392: int
393: sshkey_is_sk(const struct sshkey *k)
394: {
395: if (k == NULL)
396: return 0;
397: switch (sshkey_type_plain(k->type)) {
398: case KEY_ECDSA_SK:
399: case KEY_ED25519_SK:
400: return 1;
401: default:
402: return 0;
403: }
404: }
405:
1.1 djm 406: /* Return the cert-less equivalent to a certified key type */
407: int
408: sshkey_type_plain(int type)
409: {
410: switch (type) {
411: case KEY_RSA_CERT:
412: return KEY_RSA;
413: case KEY_DSA_CERT:
414: return KEY_DSA;
415: case KEY_ECDSA_CERT:
416: return KEY_ECDSA;
1.85 djm 417: case KEY_ECDSA_SK_CERT:
418: return KEY_ECDSA_SK;
1.1 djm 419: case KEY_ED25519_CERT:
420: return KEY_ED25519;
1.90 markus 421: case KEY_ED25519_SK_CERT:
422: return KEY_ED25519_SK;
1.62 markus 423: case KEY_XMSS_CERT:
424: return KEY_XMSS;
1.1 djm 425: default:
426: return type;
427: }
428: }
429:
1.131 ! djm 430: /* Return the cert equivalent to a plain key type */
! 431: static int
! 432: sshkey_type_certified(int type)
! 433: {
! 434: switch (type) {
! 435: case KEY_RSA:
! 436: return KEY_RSA_CERT;
! 437: case KEY_DSA:
! 438: return KEY_DSA_CERT;
! 439: case KEY_ECDSA:
! 440: return KEY_ECDSA_CERT;
! 441: case KEY_ECDSA_SK:
! 442: return KEY_ECDSA_SK_CERT;
! 443: case KEY_ED25519:
! 444: return KEY_ED25519_CERT;
! 445: case KEY_ED25519_SK:
! 446: return KEY_ED25519_SK_CERT;
! 447: case KEY_XMSS:
! 448: return KEY_XMSS_CERT;
! 449: default:
! 450: return -1;
! 451: }
! 452: }
! 453:
1.1 djm 454: #ifdef WITH_OPENSSL
455: /* XXX: these are really begging for a table-driven approach */
456: int
457: sshkey_curve_name_to_nid(const char *name)
458: {
459: if (strcmp(name, "nistp256") == 0)
460: return NID_X9_62_prime256v1;
461: else if (strcmp(name, "nistp384") == 0)
462: return NID_secp384r1;
463: else if (strcmp(name, "nistp521") == 0)
464: return NID_secp521r1;
465: else
466: return -1;
467: }
468:
469: u_int
470: sshkey_curve_nid_to_bits(int nid)
471: {
472: switch (nid) {
473: case NID_X9_62_prime256v1:
474: return 256;
475: case NID_secp384r1:
476: return 384;
477: case NID_secp521r1:
478: return 521;
479: default:
480: return 0;
481: }
482: }
483:
484: int
485: sshkey_ecdsa_bits_to_nid(int bits)
486: {
487: switch (bits) {
488: case 256:
489: return NID_X9_62_prime256v1;
490: case 384:
491: return NID_secp384r1;
492: case 521:
493: return NID_secp521r1;
494: default:
495: return -1;
496: }
497: }
498:
499: const char *
500: sshkey_curve_nid_to_name(int nid)
501: {
502: switch (nid) {
503: case NID_X9_62_prime256v1:
504: return "nistp256";
505: case NID_secp384r1:
506: return "nistp384";
507: case NID_secp521r1:
508: return "nistp521";
509: default:
510: return NULL;
511: }
512: }
513:
514: int
515: sshkey_ec_nid_to_hash_alg(int nid)
516: {
517: int kbits = sshkey_curve_nid_to_bits(nid);
518:
519: if (kbits <= 0)
520: return -1;
521:
522: /* RFC5656 section 6.2.1 */
523: if (kbits <= 256)
524: return SSH_DIGEST_SHA256;
525: else if (kbits <= 384)
526: return SSH_DIGEST_SHA384;
527: else
528: return SSH_DIGEST_SHA512;
529: }
530: #endif /* WITH_OPENSSL */
531:
532: static void
533: cert_free(struct sshkey_cert *cert)
534: {
535: u_int i;
536:
537: if (cert == NULL)
538: return;
1.31 mmcc 539: sshbuf_free(cert->certblob);
540: sshbuf_free(cert->critical);
541: sshbuf_free(cert->extensions);
1.29 mmcc 542: free(cert->key_id);
1.1 djm 543: for (i = 0; i < cert->nprincipals; i++)
544: free(cert->principals[i]);
1.29 mmcc 545: free(cert->principals);
1.30 mmcc 546: sshkey_free(cert->signature_key);
1.67 djm 547: free(cert->signature_type);
1.61 jsing 548: freezero(cert, sizeof(*cert));
1.1 djm 549: }
550:
551: static struct sshkey_cert *
552: cert_new(void)
553: {
554: struct sshkey_cert *cert;
555:
556: if ((cert = calloc(1, sizeof(*cert))) == NULL)
557: return NULL;
558: if ((cert->certblob = sshbuf_new()) == NULL ||
559: (cert->critical = sshbuf_new()) == NULL ||
560: (cert->extensions = sshbuf_new()) == NULL) {
561: cert_free(cert);
562: return NULL;
563: }
564: cert->key_id = NULL;
565: cert->principals = NULL;
566: cert->signature_key = NULL;
1.67 djm 567: cert->signature_type = NULL;
1.1 djm 568: return cert;
569: }
570:
571: struct sshkey *
572: sshkey_new(int type)
573: {
574: struct sshkey *k;
1.123 djm 575: const struct sshkey_impl *impl = NULL;
576:
577: if (type != KEY_UNSPEC &&
578: (impl = sshkey_impl_from_type(type)) == NULL)
579: return NULL;
1.1 djm 580:
1.123 djm 581: /* All non-certificate types may act as CAs */
1.1 djm 582: if ((k = calloc(1, sizeof(*k))) == NULL)
583: return NULL;
584: k->type = type;
585: k->ecdsa_nid = -1;
1.123 djm 586: if (impl != NULL && impl->funcs->alloc != NULL) {
587: if (impl->funcs->alloc(k) != 0) {
1.1 djm 588: free(k);
589: return NULL;
590: }
591: }
592: if (sshkey_is_cert(k)) {
593: if ((k->cert = cert_new()) == NULL) {
594: sshkey_free(k);
595: return NULL;
596: }
597: }
598:
599: return k;
600: }
601:
1.124 djm 602: /* Frees common FIDO fields */
603: void
604: sshkey_sk_cleanup(struct sshkey *k)
605: {
606: free(k->sk_application);
607: sshbuf_free(k->sk_key_handle);
608: sshbuf_free(k->sk_reserved);
609: k->sk_application = NULL;
610: k->sk_key_handle = k->sk_reserved = NULL;
611: }
612:
1.126 djm 613: static void
614: sshkey_free_contents(struct sshkey *k)
1.1 djm 615: {
1.123 djm 616: const struct sshkey_impl *impl;
617:
1.1 djm 618: if (k == NULL)
619: return;
1.123 djm 620: if ((impl = sshkey_impl_from_type(k->type)) != NULL &&
621: impl->funcs->cleanup != NULL)
622: impl->funcs->cleanup(k);
1.1 djm 623: if (sshkey_is_cert(k))
624: cert_free(k->cert);
1.76 djm 625: freezero(k->shielded_private, k->shielded_len);
626: freezero(k->shield_prekey, k->shield_prekey_len);
1.126 djm 627: }
628:
629: void
630: sshkey_free(struct sshkey *k)
631: {
632: sshkey_free_contents(k);
1.61 jsing 633: freezero(k, sizeof(*k));
1.1 djm 634: }
635:
636: static int
637: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
638: {
639: if (a == NULL && b == NULL)
640: return 1;
641: if (a == NULL || b == NULL)
642: return 0;
643: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
644: return 0;
645: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
646: sshbuf_len(a->certblob)) != 0)
647: return 0;
648: return 1;
649: }
650:
1.124 djm 651: /* Compares FIDO-specific pubkey fields only */
652: int
653: sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b)
654: {
655: if (a->sk_application == NULL || b->sk_application == NULL)
656: return 0;
657: if (strcmp(a->sk_application, b->sk_application) != 0)
658: return 0;
659: return 1;
660: }
661:
1.1 djm 662: /*
663: * Compare public portions of key only, allowing comparisons between
664: * certificates and plain keys too.
665: */
666: int
667: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
668: {
1.124 djm 669: const struct sshkey_impl *impl;
1.1 djm 670:
671: if (a == NULL || b == NULL ||
672: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
673: return 0;
1.124 djm 674: if ((impl = sshkey_impl_from_type(a->type)) == NULL)
1.1 djm 675: return 0;
1.124 djm 676: return impl->funcs->equal(a, b);
1.1 djm 677: }
678:
679: int
680: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
681: {
682: if (a == NULL || b == NULL || a->type != b->type)
683: return 0;
684: if (sshkey_is_cert(a)) {
685: if (!cert_compare(a->cert, b->cert))
686: return 0;
687: }
688: return sshkey_equal_public(a, b);
689: }
690:
1.125 djm 691:
692: /* Serialise common FIDO key parts */
693: int
694: sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b)
695: {
696: int r;
697:
698: if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0)
699: return r;
700:
701: return 0;
702: }
703:
1.1 djm 704: static int
1.62 markus 705: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
706: enum sshkey_serialize_rep opts)
1.1 djm 707: {
708: int type, ret = SSH_ERR_INTERNAL_ERROR;
709: const char *typename;
1.125 djm 710: const struct sshkey_impl *impl;
1.1 djm 711:
712: if (key == NULL)
713: return SSH_ERR_INVALID_ARGUMENT;
714:
1.125 djm 715: type = force_plain ? sshkey_type_plain(key->type) : key->type;
716:
717: if (sshkey_type_is_cert(type)) {
1.19 djm 718: if (key->cert == NULL)
719: return SSH_ERR_EXPECTED_CERT;
720: if (sshbuf_len(key->cert->certblob) == 0)
721: return SSH_ERR_KEY_LACKS_CERTBLOB;
1.1 djm 722: /* Use the existing blob */
723: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
724: return ret;
1.125 djm 725: return 0;
726: }
727: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 728: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.125 djm 729:
730: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
1.129 djm 731: if ((ret = sshbuf_put_cstring(b, typename)) != 0)
732: return ret;
733: return impl->funcs->serialize_public(key, b, opts);
1.1 djm 734: }
735:
736: int
1.14 djm 737: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 738: {
1.62 markus 739: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 740: }
741:
742: int
1.62 markus 743: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
744: enum sshkey_serialize_rep opts)
1.14 djm 745: {
746: struct sshbuf *tmp;
747: int r;
748:
749: if ((tmp = sshbuf_new()) == NULL)
750: return SSH_ERR_ALLOC_FAIL;
1.62 markus 751: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 752: if (r == 0)
753: r = sshbuf_put_stringb(b, tmp);
754: sshbuf_free(tmp);
755: return r;
756: }
757:
758: int
1.62 markus 759: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
760: {
761: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
762: }
763:
764: int
1.14 djm 765: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 766: {
1.62 markus 767: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 768: }
769:
770: static int
1.62 markus 771: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
772: enum sshkey_serialize_rep opts)
1.1 djm 773: {
774: int ret = SSH_ERR_INTERNAL_ERROR;
775: size_t len;
776: struct sshbuf *b = NULL;
777:
778: if (lenp != NULL)
779: *lenp = 0;
780: if (blobp != NULL)
781: *blobp = NULL;
782: if ((b = sshbuf_new()) == NULL)
783: return SSH_ERR_ALLOC_FAIL;
1.62 markus 784: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 785: goto out;
786: len = sshbuf_len(b);
787: if (lenp != NULL)
788: *lenp = len;
789: if (blobp != NULL) {
790: if ((*blobp = malloc(len)) == NULL) {
791: ret = SSH_ERR_ALLOC_FAIL;
792: goto out;
793: }
794: memcpy(*blobp, sshbuf_ptr(b), len);
795: }
796: ret = 0;
797: out:
798: sshbuf_free(b);
799: return ret;
800: }
801:
802: int
803: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
804: {
1.62 markus 805: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 806: }
807:
808: int
809: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
810: {
1.62 markus 811: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 812: }
813:
814: int
1.7 djm 815: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 816: u_char **retp, size_t *lenp)
817: {
818: u_char *blob = NULL, *ret = NULL;
819: size_t blob_len = 0;
1.7 djm 820: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 821:
822: if (retp != NULL)
823: *retp = NULL;
824: if (lenp != NULL)
825: *lenp = 0;
1.7 djm 826: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 827: r = SSH_ERR_INVALID_ARGUMENT;
828: goto out;
829: }
1.62 markus 830: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
831: != 0)
1.1 djm 832: goto out;
833: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
834: r = SSH_ERR_ALLOC_FAIL;
835: goto out;
836: }
1.7 djm 837: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 838: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
839: goto out;
840: /* success */
841: if (retp != NULL) {
842: *retp = ret;
843: ret = NULL;
844: }
845: if (lenp != NULL)
1.7 djm 846: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 847: r = 0;
848: out:
849: free(ret);
1.100 jsg 850: if (blob != NULL)
851: freezero(blob, blob_len);
1.1 djm 852: return r;
853: }
854:
855: static char *
1.7 djm 856: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
857: {
858: char *ret;
859: size_t plen = strlen(alg) + 1;
860: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
861:
862: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
863: return NULL;
864: strlcpy(ret, alg, rlen);
865: strlcat(ret, ":", rlen);
866: if (dgst_raw_len == 0)
867: return ret;
1.79 dtucker 868: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 869: freezero(ret, rlen);
1.7 djm 870: return NULL;
871: }
872: /* Trim padding characters from end */
873: ret[strcspn(ret, "=")] = '\0';
874: return ret;
875: }
876:
877: static char *
878: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 879: {
1.7 djm 880: char *retval, hex[5];
881: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 882:
1.7 djm 883: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 884: return NULL;
1.7 djm 885: strlcpy(retval, alg, rlen);
886: strlcat(retval, ":", rlen);
1.1 djm 887: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 888: snprintf(hex, sizeof(hex), "%s%02x",
889: i > 0 ? ":" : "", dgst_raw[i]);
890: strlcat(retval, hex, rlen);
1.1 djm 891: }
892: return retval;
893: }
894:
895: static char *
896: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
897: {
898: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
899: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
900: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
901: u_int i, j = 0, rounds, seed = 1;
902: char *retval;
903:
904: rounds = (dgst_raw_len / 2) + 1;
905: if ((retval = calloc(rounds, 6)) == NULL)
906: return NULL;
907: retval[j++] = 'x';
908: for (i = 0; i < rounds; i++) {
909: u_int idx0, idx1, idx2, idx3, idx4;
910: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
911: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
912: seed) % 6;
913: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
914: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
915: (seed / 6)) % 6;
916: retval[j++] = vowels[idx0];
917: retval[j++] = consonants[idx1];
918: retval[j++] = vowels[idx2];
919: if ((i + 1) < rounds) {
920: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
921: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
922: retval[j++] = consonants[idx3];
923: retval[j++] = '-';
924: retval[j++] = consonants[idx4];
925: seed = ((seed * 5) +
926: ((((u_int)(dgst_raw[2 * i])) * 7) +
927: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
928: }
929: } else {
930: idx0 = seed % 6;
931: idx1 = 16;
932: idx2 = seed / 6;
933: retval[j++] = vowels[idx0];
934: retval[j++] = consonants[idx1];
935: retval[j++] = vowels[idx2];
936: }
937: }
938: retval[j++] = 'x';
939: retval[j++] = '\0';
940: return retval;
941: }
942:
943: /*
944: * Draw an ASCII-Art representing the fingerprint so human brain can
945: * profit from its built-in pattern recognition ability.
946: * This technique is called "random art" and can be found in some
947: * scientific publications like this original paper:
948: *
949: * "Hash Visualization: a New Technique to improve Real-World Security",
950: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
951: * Techniques and E-Commerce (CrypTEC '99)
952: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
953: *
954: * The subject came up in a talk by Dan Kaminsky, too.
955: *
956: * If you see the picture is different, the key is different.
957: * If the picture looks the same, you still know nothing.
958: *
959: * The algorithm used here is a worm crawling over a discrete plane,
960: * leaving a trace (augmenting the field) everywhere it goes.
961: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
962: * makes the respective movement vector be ignored for this turn.
963: * Graphs are not unambiguous, because circles in graphs can be
964: * walked in either direction.
965: */
966:
967: /*
968: * Field sizes for the random art. Have to be odd, so the starting point
969: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
970: * Else pictures would be too dense, and drawing the frame would
971: * fail, too, because the key type would not fit in anymore.
972: */
973: #define FLDBASE 8
974: #define FLDSIZE_Y (FLDBASE + 1)
975: #define FLDSIZE_X (FLDBASE * 2 + 1)
976: static char *
1.7 djm 977: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 978: const struct sshkey *k)
979: {
980: /*
981: * Chars to be used after each other every time the worm
982: * intersects with itself. Matter of taste.
983: */
984: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 985: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 986: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 987: size_t i, tlen, hlen;
1.1 djm 988: u_int b;
1.3 djm 989: int x, y, r;
1.1 djm 990: size_t len = strlen(augmentation_string) - 1;
991:
992: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
993: return NULL;
994:
995: /* initialize field */
996: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
997: x = FLDSIZE_X / 2;
998: y = FLDSIZE_Y / 2;
999:
1000: /* process raw key */
1001: for (i = 0; i < dgst_raw_len; i++) {
1002: int input;
1003: /* each byte conveys four 2-bit move commands */
1004: input = dgst_raw[i];
1005: for (b = 0; b < 4; b++) {
1006: /* evaluate 2 bit, rest is shifted later */
1007: x += (input & 0x1) ? 1 : -1;
1008: y += (input & 0x2) ? 1 : -1;
1009:
1010: /* assure we are still in bounds */
1.37 deraadt 1011: x = MAXIMUM(x, 0);
1012: y = MAXIMUM(y, 0);
1013: x = MINIMUM(x, FLDSIZE_X - 1);
1014: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1015:
1016: /* augment the field */
1017: if (field[x][y] < len - 2)
1018: field[x][y]++;
1019: input = input >> 2;
1020: }
1021: }
1022:
1023: /* mark starting point and end point*/
1024: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1025: field[x][y] = len;
1026:
1.3 djm 1027: /* assemble title */
1028: r = snprintf(title, sizeof(title), "[%s %u]",
1029: sshkey_type(k), sshkey_size(k));
1030: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1031: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1032: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1033: tlen = (r <= 0) ? 0 : strlen(title);
1034:
1035: /* assemble hash ID. */
1036: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1037: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1038:
1039: /* output upper border */
1.3 djm 1040: p = retval;
1041: *p++ = '+';
1042: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1043: *p++ = '-';
1044: memcpy(p, title, tlen);
1045: p += tlen;
1.7 djm 1046: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1047: *p++ = '-';
1048: *p++ = '+';
1049: *p++ = '\n';
1050:
1051: /* output content */
1052: for (y = 0; y < FLDSIZE_Y; y++) {
1053: *p++ = '|';
1054: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1055: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1056: *p++ = '|';
1057: *p++ = '\n';
1058: }
1059:
1060: /* output lower border */
1061: *p++ = '+';
1.7 djm 1062: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1063: *p++ = '-';
1064: memcpy(p, hash, hlen);
1065: p += hlen;
1066: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1067: *p++ = '-';
1068: *p++ = '+';
1069:
1070: return retval;
1071: }
1072:
1073: char *
1.7 djm 1074: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1075: enum sshkey_fp_rep dgst_rep)
1076: {
1077: char *retval = NULL;
1078: u_char *dgst_raw;
1079: size_t dgst_raw_len;
1080:
1.7 djm 1081: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1082: return NULL;
1083: switch (dgst_rep) {
1.7 djm 1084: case SSH_FP_DEFAULT:
1085: if (dgst_alg == SSH_DIGEST_MD5) {
1086: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1087: dgst_raw, dgst_raw_len);
1088: } else {
1089: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1090: dgst_raw, dgst_raw_len);
1091: }
1092: break;
1.1 djm 1093: case SSH_FP_HEX:
1.7 djm 1094: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1095: dgst_raw, dgst_raw_len);
1096: break;
1097: case SSH_FP_BASE64:
1098: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1099: dgst_raw, dgst_raw_len);
1.1 djm 1100: break;
1101: case SSH_FP_BUBBLEBABBLE:
1102: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1103: break;
1104: case SSH_FP_RANDOMART:
1.7 djm 1105: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1106: dgst_raw, dgst_raw_len, k);
1.1 djm 1107: break;
1108: default:
1.100 jsg 1109: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1110: return NULL;
1111: }
1.100 jsg 1112: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1113: return retval;
1114: }
1115:
1.63 djm 1116: static int
1117: peek_type_nid(const char *s, size_t l, int *nid)
1118: {
1.123 djm 1119: const struct sshkey_impl *impl;
1120: int i;
1.63 djm 1121:
1.123 djm 1122: for (i = 0; keyimpls[i] != NULL; i++) {
1123: impl = keyimpls[i];
1124: if (impl->name == NULL || strlen(impl->name) != l)
1.63 djm 1125: continue;
1.123 djm 1126: if (memcmp(s, impl->name, l) == 0) {
1.63 djm 1127: *nid = -1;
1.123 djm 1128: if (key_type_is_ecdsa_variant(impl->type))
1129: *nid = impl->nid;
1130: return impl->type;
1.63 djm 1131: }
1132: }
1133: return KEY_UNSPEC;
1134: }
1.1 djm 1135:
1.63 djm 1136: /* XXX this can now be made const char * */
1.1 djm 1137: int
1138: sshkey_read(struct sshkey *ret, char **cpp)
1139: {
1140: struct sshkey *k;
1.63 djm 1141: char *cp, *blobcopy;
1142: size_t space;
1.1 djm 1143: int r, type, curve_nid = -1;
1144: struct sshbuf *blob;
1.44 dtucker 1145:
1146: if (ret == NULL)
1147: return SSH_ERR_INVALID_ARGUMENT;
1.126 djm 1148: if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL)
1.63 djm 1149: return SSH_ERR_INVALID_ARGUMENT;
1150:
1151: /* Decode type */
1152: cp = *cpp;
1153: space = strcspn(cp, " \t");
1154: if (space == strlen(cp))
1155: return SSH_ERR_INVALID_FORMAT;
1156: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1157: return SSH_ERR_INVALID_FORMAT;
1158:
1159: /* skip whitespace */
1160: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1161: ;
1162: if (*cp == '\0')
1163: return SSH_ERR_INVALID_FORMAT;
1164: if (ret->type != KEY_UNSPEC && ret->type != type)
1165: return SSH_ERR_KEY_TYPE_MISMATCH;
1166: if ((blob = sshbuf_new()) == NULL)
1167: return SSH_ERR_ALLOC_FAIL;
1168:
1169: /* find end of keyblob and decode */
1170: space = strcspn(cp, " \t");
1171: if ((blobcopy = strndup(cp, space)) == NULL) {
1172: sshbuf_free(blob);
1173: return SSH_ERR_ALLOC_FAIL;
1174: }
1175: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1176: free(blobcopy);
1177: sshbuf_free(blob);
1178: return r;
1179: }
1180: free(blobcopy);
1181: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1182: sshbuf_free(blob);
1.63 djm 1183: return r;
1184: }
1185: sshbuf_free(blob);
1186:
1187: /* skip whitespace and leave cp at start of comment */
1188: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1189: ;
1190:
1191: /* ensure type of blob matches type at start of line */
1192: if (k->type != type) {
1193: sshkey_free(k);
1194: return SSH_ERR_KEY_TYPE_MISMATCH;
1195: }
1.85 djm 1196: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1197: sshkey_free(k);
1198: return SSH_ERR_EC_CURVE_MISMATCH;
1199: }
1200:
1201: /* Fill in ret from parsed key */
1.126 djm 1202: sshkey_free_contents(ret);
1203: *ret = *k;
1204: freezero(k, sizeof(*k));
1.63 djm 1205:
1206: /* success */
1207: *cpp = cp;
1208: return 0;
1.1 djm 1209: }
1210:
1211: int
1.19 djm 1212: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1213: {
1.19 djm 1214: int r = SSH_ERR_INTERNAL_ERROR;
1215: struct sshbuf *b = NULL;
1.1 djm 1216: char *uu = NULL;
1.19 djm 1217:
1218: if (b64p != NULL)
1219: *b64p = NULL;
1220: if ((b = sshbuf_new()) == NULL)
1221: return SSH_ERR_ALLOC_FAIL;
1222: if ((r = sshkey_putb(key, b)) != 0)
1223: goto out;
1.81 djm 1224: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1225: r = SSH_ERR_ALLOC_FAIL;
1226: goto out;
1227: }
1228: /* Success */
1229: if (b64p != NULL) {
1230: *b64p = uu;
1231: uu = NULL;
1232: }
1233: r = 0;
1234: out:
1235: sshbuf_free(b);
1236: free(uu);
1237: return r;
1238: }
1239:
1.52 djm 1240: int
1.19 djm 1241: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1242: {
1243: int r = SSH_ERR_INTERNAL_ERROR;
1244: char *uu = NULL;
1245:
1.48 djm 1246: if ((r = sshkey_to_base64(key, &uu)) != 0)
1247: goto out;
1248: if ((r = sshbuf_putf(b, "%s %s",
1249: sshkey_ssh_name(key), uu)) != 0)
1250: goto out;
1.19 djm 1251: r = 0;
1252: out:
1253: free(uu);
1254: return r;
1255: }
1256:
1257: int
1258: sshkey_write(const struct sshkey *key, FILE *f)
1259: {
1260: struct sshbuf *b = NULL;
1261: int r = SSH_ERR_INTERNAL_ERROR;
1262:
1263: if ((b = sshbuf_new()) == NULL)
1264: return SSH_ERR_ALLOC_FAIL;
1265: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1266: goto out;
1267: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1268: if (feof(f))
1269: errno = EPIPE;
1.19 djm 1270: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1271: goto out;
1272: }
1.19 djm 1273: /* Success */
1274: r = 0;
1.1 djm 1275: out:
1.19 djm 1276: sshbuf_free(b);
1277: return r;
1.1 djm 1278: }
1279:
1280: const char *
1281: sshkey_cert_type(const struct sshkey *k)
1282: {
1283: switch (k->cert->type) {
1284: case SSH2_CERT_TYPE_USER:
1285: return "user";
1286: case SSH2_CERT_TYPE_HOST:
1287: return "host";
1288: default:
1289: return "unknown";
1290: }
1291: }
1292:
1293: #ifdef WITH_OPENSSL
1294: int
1295: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1296: {
1297: EC_GROUP *eg;
1298: int nids[] = {
1299: NID_X9_62_prime256v1,
1300: NID_secp384r1,
1301: NID_secp521r1,
1302: -1
1303: };
1304: int nid;
1305: u_int i;
1306: const EC_GROUP *g = EC_KEY_get0_group(k);
1307:
1308: /*
1309: * The group may be stored in a ASN.1 encoded private key in one of two
1310: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1311: * or explicit group parameters encoded into the key blob. Only the
1312: * "named group" case sets the group NID for us, but we can figure
1313: * it out for the other case by comparing against all the groups that
1314: * are supported.
1315: */
1316: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1317: return nid;
1318: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1319: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1320: return -1;
1.93 djm 1321: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1322: break;
1323: EC_GROUP_free(eg);
1324: }
1325: if (nids[i] != -1) {
1326: /* Use the group with the NID attached */
1327: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1328: if (EC_KEY_set_group(k, eg) != 1) {
1329: EC_GROUP_free(eg);
1330: return -1;
1331: }
1332: }
1333: return nids[i];
1334: }
1335:
1336: #endif /* WITH_OPENSSL */
1337:
1338: int
1339: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1340: {
1341: struct sshkey *k;
1342: int ret = SSH_ERR_INTERNAL_ERROR;
1.127 djm 1343: const struct sshkey_impl *impl;
1.1 djm 1344:
1.127 djm 1345: if (keyp == NULL || sshkey_type_is_cert(type))
1.1 djm 1346: return SSH_ERR_INVALID_ARGUMENT;
1347: *keyp = NULL;
1.127 djm 1348: if ((impl = sshkey_impl_from_type(type)) == NULL)
1349: return SSH_ERR_KEY_TYPE_UNKNOWN;
1350: if (impl->funcs->generate == NULL)
1351: return SSH_ERR_FEATURE_UNSUPPORTED;
1.1 djm 1352: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1353: return SSH_ERR_ALLOC_FAIL;
1.127 djm 1354: k->type = type;
1355: if ((ret = impl->funcs->generate(k, bits)) != 0) {
1356: sshkey_free(k);
1357: return ret;
1.1 djm 1358: }
1.127 djm 1359: /* success */
1360: *keyp = k;
1361: return 0;
1.1 djm 1362: }
1363:
1364: int
1365: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1366: {
1367: u_int i;
1368: const struct sshkey_cert *from;
1369: struct sshkey_cert *to;
1.67 djm 1370: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1371:
1.67 djm 1372: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1373: return SSH_ERR_INVALID_ARGUMENT;
1374:
1.67 djm 1375: if ((to = cert_new()) == NULL)
1.1 djm 1376: return SSH_ERR_ALLOC_FAIL;
1377:
1.67 djm 1378: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1379: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1380: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1381: goto out;
1.1 djm 1382:
1383: to->serial = from->serial;
1384: to->type = from->type;
1385: if (from->key_id == NULL)
1386: to->key_id = NULL;
1.67 djm 1387: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1388: r = SSH_ERR_ALLOC_FAIL;
1389: goto out;
1390: }
1.1 djm 1391: to->valid_after = from->valid_after;
1392: to->valid_before = from->valid_before;
1393: if (from->signature_key == NULL)
1394: to->signature_key = NULL;
1.67 djm 1395: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1396: &to->signature_key)) != 0)
1.67 djm 1397: goto out;
1398: if (from->signature_type != NULL &&
1399: (to->signature_type = strdup(from->signature_type)) == NULL) {
1400: r = SSH_ERR_ALLOC_FAIL;
1401: goto out;
1402: }
1403: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1404: r = SSH_ERR_INVALID_ARGUMENT;
1405: goto out;
1406: }
1.1 djm 1407: if (from->nprincipals > 0) {
1408: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1409: sizeof(*to->principals))) == NULL) {
1410: r = SSH_ERR_ALLOC_FAIL;
1411: goto out;
1412: }
1.1 djm 1413: for (i = 0; i < from->nprincipals; i++) {
1414: to->principals[i] = strdup(from->principals[i]);
1415: if (to->principals[i] == NULL) {
1416: to->nprincipals = i;
1.67 djm 1417: r = SSH_ERR_ALLOC_FAIL;
1418: goto out;
1.1 djm 1419: }
1420: }
1421: }
1422: to->nprincipals = from->nprincipals;
1.67 djm 1423:
1424: /* success */
1425: cert_free(to_key->cert);
1426: to_key->cert = to;
1427: to = NULL;
1428: r = 0;
1429: out:
1430: cert_free(to);
1431: return r;
1.1 djm 1432: }
1433:
1434: int
1.128 djm 1435: sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to)
1436: {
1437: /* Append security-key application string */
1438: if ((to->sk_application = strdup(from->sk_application)) == NULL)
1439: return SSH_ERR_ALLOC_FAIL;
1440: return 0;
1441: }
1442:
1443: int
1.1 djm 1444: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1445: {
1446: struct sshkey *n = NULL;
1.69 djm 1447: int r = SSH_ERR_INTERNAL_ERROR;
1.128 djm 1448: const struct sshkey_impl *impl;
1.1 djm 1449:
1.24 djm 1450: *pkp = NULL;
1.128 djm 1451: if ((impl = sshkey_impl_from_key(k)) == NULL)
1452: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.85 djm 1453: if ((n = sshkey_new(k->type)) == NULL) {
1454: r = SSH_ERR_ALLOC_FAIL;
1455: goto out;
1456: }
1.128 djm 1457: if ((r = impl->funcs->copy_public(k, n)) != 0)
1.69 djm 1458: goto out;
1459: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1460: goto out;
1461: /* success */
1.1 djm 1462: *pkp = n;
1.69 djm 1463: n = NULL;
1464: r = 0;
1465: out:
1466: sshkey_free(n);
1467: return r;
1.1 djm 1468: }
1469:
1.76 djm 1470: int
1471: sshkey_is_shielded(struct sshkey *k)
1472: {
1473: return k != NULL && k->shielded_private != NULL;
1474: }
1475:
1476: int
1477: sshkey_shield_private(struct sshkey *k)
1478: {
1479: struct sshbuf *prvbuf = NULL;
1480: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1481: struct sshcipher_ctx *cctx = NULL;
1482: const struct sshcipher *cipher;
1483: size_t i, enclen = 0;
1484: struct sshkey *kswap = NULL, tmp;
1485: int r = SSH_ERR_INTERNAL_ERROR;
1486:
1487: #ifdef DEBUG_PK
1488: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1489: #endif
1490: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1491: r = SSH_ERR_INVALID_ARGUMENT;
1492: goto out;
1493: }
1494: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1495: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1496: r = SSH_ERR_INTERNAL_ERROR;
1497: goto out;
1498: }
1499:
1500: /* Prepare a random pre-key, and from it an ephemeral key */
1501: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1502: r = SSH_ERR_ALLOC_FAIL;
1503: goto out;
1504: }
1505: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1506: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1507: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1508: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1509: goto out;
1510: #ifdef DEBUG_PK
1511: fprintf(stderr, "%s: key+iv\n", __func__);
1512: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1513: stderr);
1514: #endif
1515: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1516: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1517: goto out;
1518:
1519: /* Serialise and encrypt the private key using the ephemeral key */
1520: if ((prvbuf = sshbuf_new()) == NULL) {
1521: r = SSH_ERR_ALLOC_FAIL;
1522: goto out;
1523: }
1524: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1525: goto out;
1526: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.116 djm 1527: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 1528: goto out;
1529: /* pad to cipher blocksize */
1530: i = 0;
1531: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1532: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1533: goto out;
1534: }
1535: #ifdef DEBUG_PK
1536: fprintf(stderr, "%s: serialised\n", __func__);
1537: sshbuf_dump(prvbuf, stderr);
1538: #endif
1539: /* encrypt */
1540: enclen = sshbuf_len(prvbuf);
1541: if ((enc = malloc(enclen)) == NULL) {
1542: r = SSH_ERR_ALLOC_FAIL;
1543: goto out;
1544: }
1545: if ((r = cipher_crypt(cctx, 0, enc,
1546: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1547: goto out;
1548: #ifdef DEBUG_PK
1549: fprintf(stderr, "%s: encrypted\n", __func__);
1550: sshbuf_dump_data(enc, enclen, stderr);
1551: #endif
1552:
1553: /* Make a scrubbed, public-only copy of our private key argument */
1554: if ((r = sshkey_from_private(k, &kswap)) != 0)
1555: goto out;
1556:
1557: /* Swap the private key out (it will be destroyed below) */
1558: tmp = *kswap;
1559: *kswap = *k;
1560: *k = tmp;
1561:
1562: /* Insert the shielded key into our argument */
1563: k->shielded_private = enc;
1564: k->shielded_len = enclen;
1565: k->shield_prekey = prekey;
1566: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1567: enc = prekey = NULL; /* transferred */
1568: enclen = 0;
1.99 djm 1569:
1570: /* preserve key fields that are required for correct operation */
1571: k->sk_flags = kswap->sk_flags;
1.76 djm 1572:
1573: /* success */
1574: r = 0;
1575:
1576: out:
1577: /* XXX behaviour on error - invalidate original private key? */
1578: cipher_free(cctx);
1579: explicit_bzero(keyiv, sizeof(keyiv));
1580: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1581: freezero(enc, enclen);
1.76 djm 1582: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1583: sshkey_free(kswap);
1584: sshbuf_free(prvbuf);
1585: return r;
1586: }
1587:
1.121 djm 1588: /* Check deterministic padding after private key */
1589: static int
1590: private2_check_padding(struct sshbuf *decrypted)
1591: {
1592: u_char pad;
1593: size_t i;
1594: int r;
1595:
1596: i = 0;
1597: while (sshbuf_len(decrypted)) {
1598: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1599: goto out;
1600: if (pad != (++i & 0xff)) {
1601: r = SSH_ERR_INVALID_FORMAT;
1602: goto out;
1603: }
1604: }
1605: /* success */
1606: r = 0;
1607: out:
1608: explicit_bzero(&pad, sizeof(pad));
1609: explicit_bzero(&i, sizeof(i));
1610: return r;
1611: }
1612:
1.76 djm 1613: int
1614: sshkey_unshield_private(struct sshkey *k)
1615: {
1616: struct sshbuf *prvbuf = NULL;
1.121 djm 1617: u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1.76 djm 1618: struct sshcipher_ctx *cctx = NULL;
1619: const struct sshcipher *cipher;
1620: struct sshkey *kswap = NULL, tmp;
1621: int r = SSH_ERR_INTERNAL_ERROR;
1622:
1623: #ifdef DEBUG_PK
1624: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1625: #endif
1626: if (!sshkey_is_shielded(k))
1627: return 0; /* nothing to do */
1628:
1629: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1630: r = SSH_ERR_INVALID_ARGUMENT;
1631: goto out;
1632: }
1633: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1634: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1635: r = SSH_ERR_INTERNAL_ERROR;
1636: goto out;
1637: }
1638: /* check size of shielded key blob */
1639: if (k->shielded_len < cipher_blocksize(cipher) ||
1640: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1641: r = SSH_ERR_INVALID_FORMAT;
1642: goto out;
1643: }
1644:
1645: /* Calculate the ephemeral key from the prekey */
1646: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1647: k->shield_prekey, k->shield_prekey_len,
1648: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1649: goto out;
1650: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1651: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1652: goto out;
1653: #ifdef DEBUG_PK
1654: fprintf(stderr, "%s: key+iv\n", __func__);
1655: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1656: stderr);
1657: #endif
1658:
1659: /* Decrypt and parse the shielded private key using the ephemeral key */
1660: if ((prvbuf = sshbuf_new()) == NULL) {
1661: r = SSH_ERR_ALLOC_FAIL;
1662: goto out;
1663: }
1664: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
1665: goto out;
1666: /* decrypt */
1667: #ifdef DEBUG_PK
1668: fprintf(stderr, "%s: encrypted\n", __func__);
1669: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
1670: #endif
1671: if ((r = cipher_crypt(cctx, 0, cp,
1672: k->shielded_private, k->shielded_len, 0, 0)) != 0)
1673: goto out;
1674: #ifdef DEBUG_PK
1675: fprintf(stderr, "%s: serialised\n", __func__);
1676: sshbuf_dump(prvbuf, stderr);
1677: #endif
1678: /* Parse private key */
1679: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
1680: goto out;
1.121 djm 1681:
1682: if ((r = private2_check_padding(prvbuf)) != 0)
1683: goto out;
1.76 djm 1684:
1685: /* Swap the parsed key back into place */
1686: tmp = *kswap;
1687: *kswap = *k;
1688: *k = tmp;
1689:
1690: /* success */
1691: r = 0;
1692:
1693: out:
1694: cipher_free(cctx);
1695: explicit_bzero(keyiv, sizeof(keyiv));
1696: explicit_bzero(&tmp, sizeof(tmp));
1697: sshkey_free(kswap);
1698: sshbuf_free(prvbuf);
1699: return r;
1700: }
1701:
1.1 djm 1702: static int
1.14 djm 1703: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1704: {
1.14 djm 1705: struct sshbuf *principals = NULL, *crit = NULL;
1706: struct sshbuf *exts = NULL, *ca = NULL;
1707: u_char *sig = NULL;
1708: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1709: int ret = SSH_ERR_INTERNAL_ERROR;
1710:
1711: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1712: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1713: return ret;
1714:
1.20 djm 1715: /* Parse body of certificate up to signature */
1716: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1717: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1718: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1719: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1720: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1721: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1722: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1723: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1724: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1725: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1726: /* XXX debug print error for ret */
1727: ret = SSH_ERR_INVALID_FORMAT;
1728: goto out;
1729: }
1730:
1731: /* Signature is left in the buffer so we can calculate this length */
1732: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1733:
1734: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1735: ret = SSH_ERR_INVALID_FORMAT;
1736: goto out;
1737: }
1738:
1739: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1740: key->cert->type != SSH2_CERT_TYPE_HOST) {
1741: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1742: goto out;
1743: }
1744:
1.4 djm 1745: /* Parse principals section */
1746: while (sshbuf_len(principals) > 0) {
1747: char *principal = NULL;
1748: char **oprincipals = NULL;
1749:
1.1 djm 1750: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1751: ret = SSH_ERR_INVALID_FORMAT;
1752: goto out;
1753: }
1.4 djm 1754: if ((ret = sshbuf_get_cstring(principals, &principal,
1755: NULL)) != 0) {
1.1 djm 1756: ret = SSH_ERR_INVALID_FORMAT;
1757: goto out;
1758: }
1759: oprincipals = key->cert->principals;
1.51 deraadt 1760: key->cert->principals = recallocarray(key->cert->principals,
1761: key->cert->nprincipals, key->cert->nprincipals + 1,
1762: sizeof(*key->cert->principals));
1.1 djm 1763: if (key->cert->principals == NULL) {
1764: free(principal);
1765: key->cert->principals = oprincipals;
1766: ret = SSH_ERR_ALLOC_FAIL;
1767: goto out;
1768: }
1769: key->cert->principals[key->cert->nprincipals++] = principal;
1770: }
1771:
1.4 djm 1772: /*
1773: * Stash a copies of the critical options and extensions sections
1774: * for later use.
1775: */
1776: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1777: (exts != NULL &&
1778: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1779: goto out;
1780:
1.4 djm 1781: /*
1782: * Validate critical options and extensions sections format.
1783: */
1784: while (sshbuf_len(crit) != 0) {
1785: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1786: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1787: sshbuf_reset(key->cert->critical);
1.1 djm 1788: ret = SSH_ERR_INVALID_FORMAT;
1789: goto out;
1790: }
1791: }
1.4 djm 1792: while (exts != NULL && sshbuf_len(exts) != 0) {
1793: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1794: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1795: sshbuf_reset(key->cert->extensions);
1.1 djm 1796: ret = SSH_ERR_INVALID_FORMAT;
1797: goto out;
1798: }
1799: }
1800:
1.4 djm 1801: /* Parse CA key and check signature */
1.14 djm 1802: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1803: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1804: goto out;
1805: }
1806: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1807: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1808: goto out;
1809: }
1810: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 1811: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 1812: goto out;
1.82 djm 1813: if ((ret = sshkey_get_sigtype(sig, slen,
1814: &key->cert->signature_type)) != 0)
1.67 djm 1815: goto out;
1.4 djm 1816:
1817: /* Success */
1.1 djm 1818: ret = 0;
1819: out:
1.14 djm 1820: sshbuf_free(ca);
1.4 djm 1821: sshbuf_free(crit);
1822: sshbuf_free(exts);
1823: sshbuf_free(principals);
1.1 djm 1824: free(sig);
1825: return ret;
1826: }
1827:
1.122 djm 1828: int
1.129 djm 1829: sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key)
1.122 djm 1830: {
1.129 djm 1831: /* Parse additional security-key application string */
1832: if (sshbuf_get_cstring(b, &key->sk_application, NULL) != 0)
1833: return SSH_ERR_INVALID_FORMAT;
1.69 djm 1834: return 0;
1835: }
1836:
1837: static int
1.14 djm 1838: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1839: int allow_cert)
1.1 djm 1840: {
1.12 djm 1841: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.129 djm 1842: char *ktype = NULL;
1.1 djm 1843: struct sshkey *key = NULL;
1.14 djm 1844: struct sshbuf *copy;
1.129 djm 1845: const struct sshkey_impl *impl;
1.1 djm 1846:
1847: #ifdef DEBUG_PK /* XXX */
1.14 djm 1848: sshbuf_dump(b, stderr);
1.1 djm 1849: #endif
1.32 djm 1850: if (keyp != NULL)
1851: *keyp = NULL;
1.14 djm 1852: if ((copy = sshbuf_fromb(b)) == NULL) {
1853: ret = SSH_ERR_ALLOC_FAIL;
1854: goto out;
1855: }
1.1 djm 1856: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1857: ret = SSH_ERR_INVALID_FORMAT;
1858: goto out;
1859: }
1860:
1861: type = sshkey_type_from_name(ktype);
1862: if (!allow_cert && sshkey_type_is_cert(type)) {
1863: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1864: goto out;
1865: }
1.129 djm 1866: if ((impl = sshkey_impl_from_type(type)) == NULL) {
1867: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1868: goto out;
1869: }
1870: if ((key = sshkey_new(type)) == NULL) {
1871: ret = SSH_ERR_ALLOC_FAIL;
1872: goto out;
1873: }
1874: if (sshkey_type_is_cert(type)) {
1875: /* Skip nonce that preceeds all certificates */
1.1 djm 1876: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1877: ret = SSH_ERR_INVALID_FORMAT;
1878: goto out;
1879: }
1.129 djm 1880: }
1881: if ((ret = impl->funcs->deserialize_public(ktype, b, key)) != 0)
1.1 djm 1882: goto out;
1883:
1884: /* Parse certificate potion */
1.14 djm 1885: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 1886: goto out;
1887:
1888: if (key != NULL && sshbuf_len(b) != 0) {
1889: ret = SSH_ERR_INVALID_FORMAT;
1890: goto out;
1891: }
1892: ret = 0;
1.32 djm 1893: if (keyp != NULL) {
1894: *keyp = key;
1895: key = NULL;
1896: }
1.1 djm 1897: out:
1.14 djm 1898: sshbuf_free(copy);
1.1 djm 1899: sshkey_free(key);
1900: free(ktype);
1901: return ret;
1902: }
1903:
1904: int
1905: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
1906: {
1.14 djm 1907: struct sshbuf *b;
1908: int r;
1909:
1910: if ((b = sshbuf_from(blob, blen)) == NULL)
1911: return SSH_ERR_ALLOC_FAIL;
1912: r = sshkey_from_blob_internal(b, keyp, 1);
1913: sshbuf_free(b);
1914: return r;
1915: }
1916:
1917: int
1918: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
1919: {
1920: return sshkey_from_blob_internal(b, keyp, 1);
1921: }
1922:
1923: int
1924: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
1925: {
1926: struct sshbuf *b;
1927: int r;
1928:
1929: if ((r = sshbuf_froms(buf, &b)) != 0)
1930: return r;
1931: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 1932: sshbuf_free(b);
1933: return r;
1934: }
1935:
1.82 djm 1936: int
1937: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 1938: {
1939: int r;
1940: struct sshbuf *b = NULL;
1941: char *sigtype = NULL;
1942:
1943: if (sigtypep != NULL)
1944: *sigtypep = NULL;
1945: if ((b = sshbuf_from(sig, siglen)) == NULL)
1946: return SSH_ERR_ALLOC_FAIL;
1947: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
1948: goto out;
1949: /* success */
1950: if (sigtypep != NULL) {
1951: *sigtypep = sigtype;
1952: sigtype = NULL;
1953: }
1954: r = 0;
1955: out:
1956: free(sigtype);
1.14 djm 1957: sshbuf_free(b);
1958: return r;
1.68 djm 1959: }
1960:
1961: /*
1962: *
1963: * Checks whether a certificate's signature type is allowed.
1964: * Returns 0 (success) if the certificate signature type appears in the
1965: * "allowed" pattern-list, or the key is not a certificate to begin with.
1966: * Otherwise returns a ssherr.h code.
1967: */
1968: int
1969: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
1970: {
1971: if (key == NULL || allowed == NULL)
1972: return SSH_ERR_INVALID_ARGUMENT;
1973: if (!sshkey_type_is_cert(key->type))
1974: return 0;
1975: if (key->cert == NULL || key->cert->signature_type == NULL)
1976: return SSH_ERR_INVALID_ARGUMENT;
1977: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
1978: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
1979: return 0;
1.65 djm 1980: }
1981:
1982: /*
1983: * Returns the expected signature algorithm for a given public key algorithm.
1984: */
1.66 djm 1985: const char *
1986: sshkey_sigalg_by_name(const char *name)
1.65 djm 1987: {
1.123 djm 1988: const struct sshkey_impl *impl;
1989: int i;
1.65 djm 1990:
1.123 djm 1991: for (i = 0; keyimpls[i] != NULL; i++) {
1992: impl = keyimpls[i];
1993: if (strcmp(impl->name, name) != 0)
1.65 djm 1994: continue;
1.123 djm 1995: if (impl->sigalg != NULL)
1996: return impl->sigalg;
1997: if (!impl->cert)
1998: return impl->name;
1.65 djm 1999: return sshkey_ssh_name_from_type_nid(
1.123 djm 2000: sshkey_type_plain(impl->type), impl->nid);
1.65 djm 2001: }
2002: return NULL;
2003: }
2004:
2005: /*
2006: * Verifies that the signature algorithm appearing inside the signature blob
2007: * matches that which was requested.
2008: */
2009: int
2010: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2011: const char *requested_alg)
2012: {
2013: const char *expected_alg;
2014: char *sigtype = NULL;
2015: int r;
2016:
2017: if (requested_alg == NULL)
2018: return 0;
1.66 djm 2019: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2020: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2021: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2022: return r;
2023: r = strcmp(expected_alg, sigtype) == 0;
2024: free(sigtype);
2025: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2026: }
2027:
2028: int
1.76 djm 2029: sshkey_sign(struct sshkey *key,
1.1 djm 2030: u_char **sigp, size_t *lenp,
1.86 djm 2031: const u_char *data, size_t datalen,
1.111 djm 2032: const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
1.1 djm 2033: {
1.76 djm 2034: int was_shielded = sshkey_is_shielded(key);
2035: int r2, r = SSH_ERR_INTERNAL_ERROR;
1.130 djm 2036: const struct sshkey_impl *impl;
1.76 djm 2037:
1.1 djm 2038: if (sigp != NULL)
2039: *sigp = NULL;
2040: if (lenp != NULL)
2041: *lenp = 0;
2042: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2043: return SSH_ERR_INVALID_ARGUMENT;
1.130 djm 2044: if ((impl = sshkey_impl_from_key(key)) == NULL)
2045: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.76 djm 2046: if ((r = sshkey_unshield_private(key)) != 0)
2047: return r;
1.130 djm 2048: if (sshkey_is_sk(key)) {
1.97 djm 2049: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.111 djm 2050: datalen, compat, sk_pin);
1.130 djm 2051: } else {
2052: if (impl->funcs->sign == NULL)
2053: r = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2054: else {
2055: r = impl->funcs->sign(key, sigp, lenp, data, datalen,
2056: alg, sk_provider, sk_pin, compat);
2057: }
1.1 djm 2058: }
1.76 djm 2059: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2060: return r2;
2061: return r;
1.1 djm 2062: }
2063:
2064: /*
2065: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2066: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2067: */
2068: int
2069: sshkey_verify(const struct sshkey *key,
2070: const u_char *sig, size_t siglen,
1.96 djm 2071: const u_char *data, size_t dlen, const char *alg, u_int compat,
2072: struct sshkey_sig_details **detailsp)
1.1 djm 2073: {
1.130 djm 2074: const struct sshkey_impl *impl;
2075:
1.96 djm 2076: if (detailsp != NULL)
2077: *detailsp = NULL;
1.6 djm 2078: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2079: return SSH_ERR_INVALID_ARGUMENT;
1.130 djm 2080: if ((impl = sshkey_impl_from_key(key)) == NULL)
1.1 djm 2081: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.130 djm 2082: return impl->funcs->verify(key, sig, siglen, data, dlen,
2083: alg, compat, detailsp);
1.1 djm 2084: }
2085:
2086: /* Convert a plain key to their _CERT equivalent */
2087: int
1.20 djm 2088: sshkey_to_certified(struct sshkey *k)
1.1 djm 2089: {
2090: int newtype;
2091:
1.131 ! djm 2092: if ((newtype = sshkey_type_certified(k->type)) == -1)
1.1 djm 2093: return SSH_ERR_INVALID_ARGUMENT;
2094: if ((k->cert = cert_new()) == NULL)
2095: return SSH_ERR_ALLOC_FAIL;
2096: k->type = newtype;
2097: return 0;
2098: }
2099:
2100: /* Convert a certificate to its raw key equivalent */
2101: int
2102: sshkey_drop_cert(struct sshkey *k)
2103: {
2104: if (!sshkey_type_is_cert(k->type))
2105: return SSH_ERR_KEY_TYPE_UNKNOWN;
2106: cert_free(k->cert);
2107: k->cert = NULL;
2108: k->type = sshkey_type_plain(k->type);
2109: return 0;
2110: }
2111:
2112: /* Sign a certified key, (re-)generating the signed certblob. */
2113: int
1.53 djm 2114: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2115: const char *sk_provider, const char *sk_pin,
2116: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2117: {
1.131 ! djm 2118: const struct sshkey_impl *impl;
1.1 djm 2119: struct sshbuf *principals = NULL;
2120: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2121: size_t i, ca_len, sig_len;
2122: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2123: struct sshbuf *cert = NULL;
2124: char *sigtype = NULL;
1.1 djm 2125:
2126: if (k == NULL || k->cert == NULL ||
2127: k->cert->certblob == NULL || ca == NULL)
2128: return SSH_ERR_INVALID_ARGUMENT;
2129: if (!sshkey_is_cert(k))
2130: return SSH_ERR_KEY_TYPE_UNKNOWN;
2131: if (!sshkey_type_is_valid_ca(ca->type))
2132: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1.131 ! djm 2133: if ((impl = sshkey_impl_from_key(k)) == NULL)
! 2134: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 2135:
1.67 djm 2136: /*
2137: * If no alg specified as argument but a signature_type was set,
2138: * then prefer that. If both were specified, then they must match.
2139: */
2140: if (alg == NULL)
2141: alg = k->cert->signature_type;
2142: else if (k->cert->signature_type != NULL &&
2143: strcmp(alg, k->cert->signature_type) != 0)
2144: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2145:
2146: /*
2147: * If no signing algorithm or signature_type was specified and we're
2148: * using a RSA key, then default to a good signature algorithm.
2149: */
2150: if (alg == NULL && ca->type == KEY_RSA)
2151: alg = "rsa-sha2-512";
1.67 djm 2152:
1.1 djm 2153: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2154: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2155:
2156: cert = k->cert->certblob; /* for readability */
2157: sshbuf_reset(cert);
2158: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2159: goto out;
2160:
2161: /* -v01 certs put nonce first */
2162: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2163: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2164: goto out;
1.1 djm 2165:
1.131 ! djm 2166: /* Public key next */
! 2167: if ((ret = impl->funcs->serialize_public(k, cert,
! 2168: SSHKEY_SERIALIZE_DEFAULT)) != 0)
1.15 djm 2169: goto out;
1.1 djm 2170:
1.131 ! djm 2171: /* Then remaining cert fields */
1.20 djm 2172: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2173: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2174: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2175: goto out;
2176:
2177: if ((principals = sshbuf_new()) == NULL) {
2178: ret = SSH_ERR_ALLOC_FAIL;
2179: goto out;
2180: }
2181: for (i = 0; i < k->cert->nprincipals; i++) {
2182: if ((ret = sshbuf_put_cstring(principals,
2183: k->cert->principals[i])) != 0)
2184: goto out;
2185: }
2186: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2187: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2188: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2189: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2190: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2191: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2192: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2193: goto out;
2194:
2195: /* Sign the whole mess */
1.53 djm 2196: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.111 djm 2197: sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
1.1 djm 2198: goto out;
1.67 djm 2199: /* Check and update signature_type against what was actually used */
1.82 djm 2200: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2201: goto out;
2202: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2203: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2204: goto out;
2205: }
2206: if (k->cert->signature_type == NULL) {
2207: k->cert->signature_type = sigtype;
2208: sigtype = NULL;
2209: }
1.1 djm 2210: /* Append signature and we are done */
2211: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2212: goto out;
2213: ret = 0;
2214: out:
2215: if (ret != 0)
2216: sshbuf_reset(cert);
1.29 mmcc 2217: free(sig_blob);
2218: free(ca_blob);
1.67 djm 2219: free(sigtype);
1.31 mmcc 2220: sshbuf_free(principals);
1.1 djm 2221: return ret;
1.53 djm 2222: }
2223:
2224: static int
1.76 djm 2225: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2226: const u_char *data, size_t datalen,
1.111 djm 2227: const char *alg, const char *sk_provider, const char *sk_pin,
2228: u_int compat, void *ctx)
1.53 djm 2229: {
2230: if (ctx != NULL)
2231: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2232: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
1.111 djm 2233: sk_provider, sk_pin, compat);
1.53 djm 2234: }
2235:
2236: int
1.86 djm 2237: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2238: const char *sk_provider, const char *sk_pin)
1.53 djm 2239: {
1.111 djm 2240: return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
1.86 djm 2241: default_key_sign, NULL);
1.1 djm 2242: }
2243:
2244: int
2245: sshkey_cert_check_authority(const struct sshkey *k,
1.114 djm 2246: int want_host, int require_principal, int wildcard_pattern,
1.119 djm 2247: uint64_t verify_time, const char *name, const char **reason)
1.1 djm 2248: {
2249: u_int i, principal_matches;
2250:
1.102 markus 2251: if (reason == NULL)
2252: return SSH_ERR_INVALID_ARGUMENT;
1.114 djm 2253: if (!sshkey_is_cert(k)) {
2254: *reason = "Key is not a certificate";
2255: return SSH_ERR_KEY_CERT_INVALID;
2256: }
1.1 djm 2257: if (want_host) {
2258: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2259: *reason = "Certificate invalid: not a host certificate";
2260: return SSH_ERR_KEY_CERT_INVALID;
2261: }
2262: } else {
2263: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2264: *reason = "Certificate invalid: not a user certificate";
2265: return SSH_ERR_KEY_CERT_INVALID;
2266: }
2267: }
1.119 djm 2268: if (verify_time < k->cert->valid_after) {
1.1 djm 2269: *reason = "Certificate invalid: not yet valid";
2270: return SSH_ERR_KEY_CERT_INVALID;
2271: }
1.119 djm 2272: if (verify_time >= k->cert->valid_before) {
1.1 djm 2273: *reason = "Certificate invalid: expired";
2274: return SSH_ERR_KEY_CERT_INVALID;
2275: }
2276: if (k->cert->nprincipals == 0) {
2277: if (require_principal) {
2278: *reason = "Certificate lacks principal list";
2279: return SSH_ERR_KEY_CERT_INVALID;
2280: }
2281: } else if (name != NULL) {
2282: principal_matches = 0;
2283: for (i = 0; i < k->cert->nprincipals; i++) {
1.114 djm 2284: if (wildcard_pattern) {
2285: if (match_pattern(k->cert->principals[i],
2286: name)) {
2287: principal_matches = 1;
2288: break;
2289: }
2290: } else if (strcmp(name, k->cert->principals[i]) == 0) {
1.1 djm 2291: principal_matches = 1;
2292: break;
2293: }
2294: }
2295: if (!principal_matches) {
2296: *reason = "Certificate invalid: name is not a listed "
2297: "principal";
2298: return SSH_ERR_KEY_CERT_INVALID;
2299: }
1.114 djm 2300: }
2301: return 0;
2302: }
2303:
2304: int
1.119 djm 2305: sshkey_cert_check_authority_now(const struct sshkey *k,
2306: int want_host, int require_principal, int wildcard_pattern,
2307: const char *name, const char **reason)
2308: {
2309: time_t now;
2310:
2311: if ((now = time(NULL)) < 0) {
2312: /* yikes - system clock before epoch! */
2313: *reason = "Certificate invalid: not yet valid";
2314: return SSH_ERR_KEY_CERT_INVALID;
2315: }
2316: return sshkey_cert_check_authority(k, want_host, require_principal,
2317: wildcard_pattern, (uint64_t)now, name, reason);
2318: }
2319:
2320: int
1.114 djm 2321: sshkey_cert_check_host(const struct sshkey *key, const char *host,
2322: int wildcard_principals, const char *ca_sign_algorithms,
2323: const char **reason)
2324: {
2325: int r;
2326:
1.119 djm 2327: if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
1.114 djm 2328: host, reason)) != 0)
2329: return r;
2330: if (sshbuf_len(key->cert->critical) != 0) {
2331: *reason = "Certificate contains unsupported critical options";
2332: return SSH_ERR_KEY_CERT_INVALID;
2333: }
2334: if (ca_sign_algorithms != NULL &&
2335: (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2336: *reason = "Certificate signed with disallowed algorithm";
2337: return SSH_ERR_KEY_CERT_INVALID;
1.1 djm 2338: }
2339: return 0;
1.27 djm 2340: }
2341:
2342: size_t
2343: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2344: {
1.113 dtucker 2345: char from[32], to[32], ret[128];
1.27 djm 2346:
2347: *from = *to = '\0';
2348: if (cert->valid_after == 0 &&
2349: cert->valid_before == 0xffffffffffffffffULL)
2350: return strlcpy(s, "forever", l);
2351:
1.118 dtucker 2352: if (cert->valid_after != 0)
2353: format_absolute_time(cert->valid_after, from, sizeof(from));
2354: if (cert->valid_before != 0xffffffffffffffffULL)
2355: format_absolute_time(cert->valid_before, to, sizeof(to));
1.27 djm 2356:
2357: if (cert->valid_after == 0)
2358: snprintf(ret, sizeof(ret), "before %s", to);
2359: else if (cert->valid_before == 0xffffffffffffffffULL)
2360: snprintf(ret, sizeof(ret), "after %s", from);
2361: else
2362: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2363:
2364: return strlcpy(s, ret, l);
1.1 djm 2365: }
2366:
2367: int
1.76 djm 2368: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2369: enum sshkey_serialize_rep opts)
1.1 djm 2370: {
2371: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2372: int was_shielded = sshkey_is_shielded(key);
2373: struct sshbuf *b = NULL;
1.69 djm 2374: #ifdef WITH_OPENSSL
2375: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2376: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2377: #endif /* WITH_OPENSSL */
1.1 djm 2378:
1.76 djm 2379: if ((r = sshkey_unshield_private(key)) != 0)
2380: return r;
2381: if ((b = sshbuf_new()) == NULL)
2382: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2383: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2384: goto out;
2385: switch (key->type) {
2386: #ifdef WITH_OPENSSL
2387: case KEY_RSA:
1.69 djm 2388: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2389: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2390: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2391: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2392: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2393: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2394: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2395: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2396: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2397: goto out;
2398: break;
2399: case KEY_RSA_CERT:
2400: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2401: r = SSH_ERR_INVALID_ARGUMENT;
2402: goto out;
2403: }
1.69 djm 2404: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2405: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2406: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2407: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2408: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2409: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2410: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2411: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2412: goto out;
2413: break;
2414: case KEY_DSA:
1.69 djm 2415: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2416: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2417: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2418: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2419: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2420: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2421: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2422: goto out;
2423: break;
2424: case KEY_DSA_CERT:
2425: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2426: r = SSH_ERR_INVALID_ARGUMENT;
2427: goto out;
2428: }
1.69 djm 2429: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2430: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2431: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2432: goto out;
2433: break;
2434: case KEY_ECDSA:
2435: if ((r = sshbuf_put_cstring(b,
2436: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2437: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2438: (r = sshbuf_put_bignum2(b,
2439: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2440: goto out;
2441: break;
2442: case KEY_ECDSA_CERT:
2443: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2444: r = SSH_ERR_INVALID_ARGUMENT;
2445: goto out;
2446: }
2447: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2448: (r = sshbuf_put_bignum2(b,
2449: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2450: goto out;
2451: break;
1.85 djm 2452: case KEY_ECDSA_SK:
2453: if ((r = sshbuf_put_cstring(b,
2454: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2455: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2456: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2457: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2458: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2459: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2460: goto out;
2461: break;
2462: case KEY_ECDSA_SK_CERT:
2463: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2464: r = SSH_ERR_INVALID_ARGUMENT;
2465: goto out;
2466: }
2467: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2468: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2469: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2470: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2471: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2472: goto out;
2473: break;
1.1 djm 2474: #endif /* WITH_OPENSSL */
2475: case KEY_ED25519:
2476: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2477: ED25519_PK_SZ)) != 0 ||
2478: (r = sshbuf_put_string(b, key->ed25519_sk,
2479: ED25519_SK_SZ)) != 0)
2480: goto out;
2481: break;
2482: case KEY_ED25519_CERT:
2483: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2484: r = SSH_ERR_INVALID_ARGUMENT;
2485: goto out;
2486: }
2487: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2488: (r = sshbuf_put_string(b, key->ed25519_pk,
2489: ED25519_PK_SZ)) != 0 ||
2490: (r = sshbuf_put_string(b, key->ed25519_sk,
2491: ED25519_SK_SZ)) != 0)
2492: goto out;
2493: break;
1.90 markus 2494: case KEY_ED25519_SK:
2495: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2496: ED25519_PK_SZ)) != 0 ||
2497: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2498: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2499: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2500: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2501: goto out;
2502: break;
2503: case KEY_ED25519_SK_CERT:
2504: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2505: r = SSH_ERR_INVALID_ARGUMENT;
2506: goto out;
2507: }
2508: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2509: (r = sshbuf_put_string(b, key->ed25519_pk,
2510: ED25519_PK_SZ)) != 0 ||
2511: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2512: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2513: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2514: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2515: goto out;
2516: break;
1.62 markus 2517: #ifdef WITH_XMSS
2518: case KEY_XMSS:
2519: if (key->xmss_name == NULL) {
2520: r = SSH_ERR_INVALID_ARGUMENT;
2521: goto out;
2522: }
2523: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2524: (r = sshbuf_put_string(b, key->xmss_pk,
2525: sshkey_xmss_pklen(key))) != 0 ||
2526: (r = sshbuf_put_string(b, key->xmss_sk,
2527: sshkey_xmss_sklen(key))) != 0 ||
2528: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2529: goto out;
2530: break;
2531: case KEY_XMSS_CERT:
2532: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2533: key->xmss_name == NULL) {
2534: r = SSH_ERR_INVALID_ARGUMENT;
2535: goto out;
2536: }
2537: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2538: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2539: (r = sshbuf_put_string(b, key->xmss_pk,
2540: sshkey_xmss_pklen(key))) != 0 ||
2541: (r = sshbuf_put_string(b, key->xmss_sk,
2542: sshkey_xmss_sklen(key))) != 0 ||
2543: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2544: goto out;
2545: break;
2546: #endif /* WITH_XMSS */
1.1 djm 2547: default:
2548: r = SSH_ERR_INVALID_ARGUMENT;
2549: goto out;
2550: }
1.76 djm 2551: /*
2552: * success (but we still need to append the output to buf after
2553: * possibly re-shielding the private key)
2554: */
1.1 djm 2555: r = 0;
2556: out:
1.76 djm 2557: if (was_shielded)
2558: r = sshkey_shield_private(key);
2559: if (r == 0)
2560: r = sshbuf_putb(buf, b);
2561: sshbuf_free(b);
2562:
1.1 djm 2563: return r;
2564: }
2565:
2566: int
1.76 djm 2567: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 2568: {
2569: return sshkey_private_serialize_opt(key, b,
2570: SSHKEY_SERIALIZE_DEFAULT);
2571: }
2572:
2573: int
1.1 djm 2574: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2575: {
1.62 markus 2576: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.115 djm 2577: char *expect_sk_application = NULL;
1.1 djm 2578: struct sshkey *k = NULL;
1.14 djm 2579: size_t pklen = 0, sklen = 0;
1.1 djm 2580: int type, r = SSH_ERR_INTERNAL_ERROR;
2581: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.115 djm 2582: u_char *expect_ed25519_pk = NULL;
1.62 markus 2583: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2584: #ifdef WITH_OPENSSL
2585: BIGNUM *exponent = NULL;
1.69 djm 2586: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2587: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2588: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2589: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2590: #endif /* WITH_OPENSSL */
2591:
2592: if (kp != NULL)
2593: *kp = NULL;
2594: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2595: goto out;
2596: type = sshkey_type_from_name(tname);
1.108 djm 2597: if (sshkey_type_is_cert(type)) {
2598: /*
2599: * Certificate key private keys begin with the certificate
2600: * itself. Make sure this matches the type of the enclosing
2601: * private key.
2602: */
2603: if ((r = sshkey_froms(buf, &k)) != 0)
2604: goto out;
2605: if (k->type != type) {
2606: r = SSH_ERR_KEY_CERT_MISMATCH;
2607: goto out;
2608: }
2609: /* For ECDSA keys, the group must match too */
2610: if (k->type == KEY_ECDSA &&
2611: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2612: r = SSH_ERR_KEY_CERT_MISMATCH;
2613: goto out;
2614: }
1.115 djm 2615: /*
2616: * Several fields are redundant between certificate and
2617: * private key body, we require these to match.
2618: */
2619: expect_sk_application = k->sk_application;
2620: expect_ed25519_pk = k->ed25519_pk;
2621: k->sk_application = NULL;
2622: k->ed25519_pk = NULL;
1.108 djm 2623: } else {
1.70 djm 2624: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2625: r = SSH_ERR_ALLOC_FAIL;
2626: goto out;
2627: }
1.108 djm 2628: }
2629: switch (type) {
2630: #ifdef WITH_OPENSSL
2631: case KEY_DSA:
1.73 djm 2632: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
2633: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
2634: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
1.108 djm 2635: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0)
1.69 djm 2636: goto out;
2637: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2638: r = SSH_ERR_LIBCRYPTO_ERROR;
2639: goto out;
2640: }
2641: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
1.108 djm 2642: if (!DSA_set0_key(k->dsa, dsa_pub_key, NULL)) {
1.69 djm 2643: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2644: goto out;
1.69 djm 2645: }
1.108 djm 2646: dsa_pub_key = NULL; /* transferred */
2647: /* FALLTHROUGH */
1.1 djm 2648: case KEY_DSA_CERT:
1.108 djm 2649: if ((r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.84 djm 2650: goto out;
1.69 djm 2651: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2652: r = SSH_ERR_LIBCRYPTO_ERROR;
2653: goto out;
2654: }
2655: dsa_priv_key = NULL; /* transferred */
1.1 djm 2656: break;
2657: case KEY_ECDSA:
2658: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2659: r = SSH_ERR_INVALID_ARGUMENT;
2660: goto out;
2661: }
2662: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2663: goto out;
2664: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2665: r = SSH_ERR_EC_CURVE_MISMATCH;
2666: goto out;
2667: }
2668: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 2669: if (k->ecdsa == NULL) {
1.1 djm 2670: r = SSH_ERR_LIBCRYPTO_ERROR;
2671: goto out;
2672: }
1.108 djm 2673: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0)
1.1 djm 2674: goto out;
1.108 djm 2675: /* FALLTHROUGH */
1.1 djm 2676: case KEY_ECDSA_CERT:
1.108 djm 2677: if ((r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 2678: goto out;
2679: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2680: r = SSH_ERR_LIBCRYPTO_ERROR;
2681: goto out;
2682: }
2683: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2684: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2685: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2686: goto out;
2687: break;
1.85 djm 2688: case KEY_ECDSA_SK:
2689: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2690: r = SSH_ERR_INVALID_ARGUMENT;
2691: goto out;
2692: }
2693: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2694: goto out;
2695: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2696: r = SSH_ERR_EC_CURVE_MISMATCH;
2697: goto out;
2698: }
2699: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2700: (k->sk_reserved = sshbuf_new()) == NULL) {
2701: r = SSH_ERR_ALLOC_FAIL;
2702: goto out;
2703: }
2704: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2705: if (k->ecdsa == NULL) {
2706: r = SSH_ERR_LIBCRYPTO_ERROR;
2707: goto out;
2708: }
2709: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2710: (r = sshbuf_get_cstring(buf, &k->sk_application,
2711: NULL)) != 0 ||
2712: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2713: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2714: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2715: goto out;
2716: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2717: EC_KEY_get0_public_key(k->ecdsa))) != 0)
2718: goto out;
2719: break;
2720: case KEY_ECDSA_SK_CERT:
2721: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2722: (k->sk_reserved = sshbuf_new()) == NULL) {
2723: r = SSH_ERR_ALLOC_FAIL;
2724: goto out;
2725: }
2726: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
2727: NULL)) != 0 ||
2728: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2729: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2730: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2731: goto out;
2732: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2733: EC_KEY_get0_public_key(k->ecdsa))) != 0)
2734: goto out;
2735: break;
1.1 djm 2736: case KEY_RSA:
1.73 djm 2737: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
1.108 djm 2738: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0)
1.1 djm 2739: goto out;
1.108 djm 2740: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, NULL)) {
1.69 djm 2741: r = SSH_ERR_LIBCRYPTO_ERROR;
2742: goto out;
2743: }
1.108 djm 2744: rsa_n = rsa_e = NULL; /* transferred */
2745: /* FALLTHROUGH */
1.1 djm 2746: case KEY_RSA_CERT:
1.108 djm 2747: if ((r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
1.73 djm 2748: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
2749: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
2750: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 2751: goto out;
1.69 djm 2752: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
2753: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2754: goto out;
2755: }
1.69 djm 2756: rsa_d = NULL; /* transferred */
2757: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
2758: r = SSH_ERR_LIBCRYPTO_ERROR;
2759: goto out;
2760: }
2761: rsa_p = rsa_q = NULL; /* transferred */
1.122 djm 2762: if ((r = sshkey_check_rsa_length(k, 0)) != 0)
1.69 djm 2763: goto out;
2764: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
2765: goto out;
1.1 djm 2766: break;
2767: #endif /* WITH_OPENSSL */
2768: case KEY_ED25519:
1.108 djm 2769: case KEY_ED25519_CERT:
1.1 djm 2770: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2771: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2772: goto out;
2773: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2774: r = SSH_ERR_INVALID_FORMAT;
2775: goto out;
2776: }
2777: k->ed25519_pk = ed25519_pk;
2778: k->ed25519_sk = ed25519_sk;
1.84 djm 2779: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 2780: break;
1.90 markus 2781: case KEY_ED25519_SK:
1.108 djm 2782: case KEY_ED25519_SK_CERT:
1.90 markus 2783: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
2784: goto out;
2785: if (pklen != ED25519_PK_SZ) {
2786: r = SSH_ERR_INVALID_FORMAT;
2787: goto out;
2788: }
2789: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2790: (k->sk_reserved = sshbuf_new()) == NULL) {
2791: r = SSH_ERR_ALLOC_FAIL;
2792: goto out;
2793: }
2794: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
2795: NULL)) != 0 ||
2796: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2797: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2798: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2799: goto out;
2800: k->ed25519_pk = ed25519_pk;
2801: ed25519_pk = NULL; /* transferred */
2802: break;
1.62 markus 2803: #ifdef WITH_XMSS
2804: case KEY_XMSS:
1.108 djm 2805: case KEY_XMSS_CERT:
1.62 markus 2806: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
2807: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
2808: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
1.110 markus 2809: goto out;
2810: if (type == KEY_XMSS &&
2811: (r = sshkey_xmss_init(k, xmss_name)) != 0)
1.62 markus 2812: goto out;
2813: if (pklen != sshkey_xmss_pklen(k) ||
2814: sklen != sshkey_xmss_sklen(k)) {
2815: r = SSH_ERR_INVALID_FORMAT;
2816: goto out;
2817: }
2818: k->xmss_pk = xmss_pk;
2819: k->xmss_sk = xmss_sk;
2820: xmss_pk = xmss_sk = NULL;
2821: /* optional internal state */
2822: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
2823: goto out;
2824: break;
2825: #endif /* WITH_XMSS */
1.1 djm 2826: default:
2827: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2828: goto out;
2829: }
2830: #ifdef WITH_OPENSSL
2831: /* enable blinding */
2832: switch (k->type) {
2833: case KEY_RSA:
2834: case KEY_RSA_CERT:
2835: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2836: r = SSH_ERR_LIBCRYPTO_ERROR;
2837: goto out;
2838: }
2839: break;
2840: }
2841: #endif /* WITH_OPENSSL */
1.115 djm 2842: if ((expect_sk_application != NULL && (k->sk_application == NULL ||
2843: strcmp(expect_sk_application, k->sk_application) != 0)) ||
2844: (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
1.116 djm 2845: memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
1.115 djm 2846: r = SSH_ERR_KEY_CERT_MISMATCH;
2847: goto out;
2848: }
1.1 djm 2849: /* success */
2850: r = 0;
2851: if (kp != NULL) {
2852: *kp = k;
2853: k = NULL;
2854: }
2855: out:
2856: free(tname);
2857: free(curve);
2858: #ifdef WITH_OPENSSL
1.60 jsing 2859: BN_clear_free(exponent);
1.69 djm 2860: BN_clear_free(dsa_p);
2861: BN_clear_free(dsa_q);
2862: BN_clear_free(dsa_g);
2863: BN_clear_free(dsa_pub_key);
2864: BN_clear_free(dsa_priv_key);
2865: BN_clear_free(rsa_n);
2866: BN_clear_free(rsa_e);
2867: BN_clear_free(rsa_d);
2868: BN_clear_free(rsa_p);
2869: BN_clear_free(rsa_q);
2870: BN_clear_free(rsa_iqmp);
1.1 djm 2871: #endif /* WITH_OPENSSL */
2872: sshkey_free(k);
1.61 jsing 2873: freezero(ed25519_pk, pklen);
2874: freezero(ed25519_sk, sklen);
1.62 markus 2875: free(xmss_name);
2876: freezero(xmss_pk, pklen);
2877: freezero(xmss_sk, sklen);
1.115 djm 2878: free(expect_sk_application);
2879: free(expect_ed25519_pk);
1.1 djm 2880: return r;
2881: }
2882:
2883: #ifdef WITH_OPENSSL
2884: int
2885: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2886: {
2887: EC_POINT *nq = NULL;
1.93 djm 2888: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 2889: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2890:
2891: /*
2892: * NB. This assumes OpenSSL has already verified that the public
2893: * point lies on the curve. This is done by EC_POINT_oct2point()
2894: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2895: * reachable with public points not unmarshalled using
2896: * EC_POINT_oct2point then the caller will need to explicitly check.
2897: */
1.1 djm 2898:
2899: /*
2900: * We shouldn't ever hit this case because bignum_get_ecpoint()
2901: * refuses to load GF2m points.
2902: */
2903: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2904: NID_X9_62_prime_field)
2905: goto out;
2906:
2907: /* Q != infinity */
2908: if (EC_POINT_is_at_infinity(group, public))
2909: goto out;
2910:
1.93 djm 2911: if ((x = BN_new()) == NULL ||
2912: (y = BN_new()) == NULL ||
2913: (order = BN_new()) == NULL ||
2914: (tmp = BN_new()) == NULL) {
1.1 djm 2915: ret = SSH_ERR_ALLOC_FAIL;
2916: goto out;
2917: }
2918:
2919: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 2920: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 2921: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 2922: x, y, NULL) != 1) {
1.1 djm 2923: ret = SSH_ERR_LIBCRYPTO_ERROR;
2924: goto out;
2925: }
2926: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2927: BN_num_bits(y) <= BN_num_bits(order) / 2)
2928: goto out;
2929:
2930: /* nQ == infinity (n == order of subgroup) */
2931: if ((nq = EC_POINT_new(group)) == NULL) {
2932: ret = SSH_ERR_ALLOC_FAIL;
2933: goto out;
2934: }
1.93 djm 2935: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 2936: ret = SSH_ERR_LIBCRYPTO_ERROR;
2937: goto out;
2938: }
2939: if (EC_POINT_is_at_infinity(group, nq) != 1)
2940: goto out;
2941:
2942: /* x < order - 1, y < order - 1 */
2943: if (!BN_sub(tmp, order, BN_value_one())) {
2944: ret = SSH_ERR_LIBCRYPTO_ERROR;
2945: goto out;
2946: }
2947: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2948: goto out;
2949: ret = 0;
2950: out:
1.93 djm 2951: BN_clear_free(x);
2952: BN_clear_free(y);
2953: BN_clear_free(order);
2954: BN_clear_free(tmp);
1.60 jsing 2955: EC_POINT_free(nq);
1.1 djm 2956: return ret;
2957: }
2958:
2959: int
2960: sshkey_ec_validate_private(const EC_KEY *key)
2961: {
1.93 djm 2962: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 2963: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2964:
1.93 djm 2965: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 2966: ret = SSH_ERR_ALLOC_FAIL;
2967: goto out;
2968: }
2969:
2970: /* log2(private) > log2(order)/2 */
1.93 djm 2971: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 2972: ret = SSH_ERR_LIBCRYPTO_ERROR;
2973: goto out;
2974: }
2975: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2976: BN_num_bits(order) / 2)
2977: goto out;
2978:
2979: /* private < order - 1 */
2980: if (!BN_sub(tmp, order, BN_value_one())) {
2981: ret = SSH_ERR_LIBCRYPTO_ERROR;
2982: goto out;
2983: }
2984: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2985: goto out;
2986: ret = 0;
2987: out:
1.93 djm 2988: BN_clear_free(order);
2989: BN_clear_free(tmp);
1.1 djm 2990: return ret;
2991: }
2992:
2993: void
2994: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2995: {
1.93 djm 2996: BIGNUM *x = NULL, *y = NULL;
1.1 djm 2997:
2998: if (point == NULL) {
2999: fputs("point=(NULL)\n", stderr);
3000: return;
3001: }
1.93 djm 3002: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3003: fprintf(stderr, "%s: BN_new failed\n", __func__);
3004: goto out;
1.1 djm 3005: }
3006: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3007: NID_X9_62_prime_field) {
3008: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3009: goto out;
1.1 djm 3010: }
1.93 djm 3011: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3012: x, y, NULL) != 1) {
1.1 djm 3013: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3014: __func__);
1.93 djm 3015: goto out;
1.1 djm 3016: }
3017: fputs("x=", stderr);
3018: BN_print_fp(stderr, x);
3019: fputs("\ny=", stderr);
3020: BN_print_fp(stderr, y);
3021: fputs("\n", stderr);
1.93 djm 3022: out:
3023: BN_clear_free(x);
3024: BN_clear_free(y);
1.1 djm 3025: }
3026:
3027: void
3028: sshkey_dump_ec_key(const EC_KEY *key)
3029: {
3030: const BIGNUM *exponent;
3031:
3032: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3033: EC_KEY_get0_public_key(key));
3034: fputs("exponent=", stderr);
3035: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3036: fputs("(NULL)", stderr);
3037: else
3038: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3039: fputs("\n", stderr);
3040: }
3041: #endif /* WITH_OPENSSL */
3042:
3043: static int
1.76 djm 3044: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3045: const char *passphrase, const char *comment, const char *ciphername,
3046: int rounds)
3047: {
1.4 djm 3048: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3049: u_char salt[SALT_LEN];
1.4 djm 3050: char *b64 = NULL;
1.1 djm 3051: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3052: u_int check;
3053: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3054: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3055: const struct sshcipher *cipher;
3056: const char *kdfname = KDFNAME;
3057: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3058:
3059: if (rounds <= 0)
3060: rounds = DEFAULT_ROUNDS;
3061: if (passphrase == NULL || !strlen(passphrase)) {
3062: ciphername = "none";
3063: kdfname = "none";
3064: } else if (ciphername == NULL)
3065: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3066: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3067: r = SSH_ERR_INVALID_ARGUMENT;
3068: goto out;
3069: }
3070:
3071: if ((kdf = sshbuf_new()) == NULL ||
3072: (encoded = sshbuf_new()) == NULL ||
3073: (encrypted = sshbuf_new()) == NULL) {
3074: r = SSH_ERR_ALLOC_FAIL;
3075: goto out;
3076: }
3077: blocksize = cipher_blocksize(cipher);
3078: keylen = cipher_keylen(cipher);
3079: ivlen = cipher_ivlen(cipher);
3080: authlen = cipher_authlen(cipher);
3081: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3082: r = SSH_ERR_ALLOC_FAIL;
3083: goto out;
3084: }
3085: if (strcmp(kdfname, "bcrypt") == 0) {
3086: arc4random_buf(salt, SALT_LEN);
3087: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3088: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3089: r = SSH_ERR_INVALID_ARGUMENT;
3090: goto out;
3091: }
3092: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3093: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3094: goto out;
3095: } else if (strcmp(kdfname, "none") != 0) {
3096: /* Unsupported KDF type */
3097: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3098: goto out;
3099: }
3100: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3101: key + keylen, ivlen, 1)) != 0)
3102: goto out;
3103:
3104: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3105: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3106: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3107: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3108: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3109: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3110: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3111: goto out;
3112:
3113: /* set up the buffer that will be encrypted */
3114:
3115: /* Random check bytes */
3116: check = arc4random();
3117: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3118: (r = sshbuf_put_u32(encrypted, check)) != 0)
3119: goto out;
3120:
3121: /* append private key and comment*/
1.62 markus 3122: if ((r = sshkey_private_serialize_opt(prv, encrypted,
1.116 djm 3123: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3124: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3125: goto out;
3126:
3127: /* padding */
3128: i = 0;
3129: while (sshbuf_len(encrypted) % blocksize) {
3130: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3131: goto out;
3132: }
3133:
3134: /* length in destination buffer */
3135: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3136: goto out;
3137:
3138: /* encrypt */
3139: if ((r = sshbuf_reserve(encoded,
3140: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3141: goto out;
1.36 djm 3142: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3143: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3144: goto out;
3145:
1.81 djm 3146: sshbuf_reset(blob);
1.1 djm 3147:
1.81 djm 3148: /* assemble uuencoded key */
3149: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3150: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3151: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3152: goto out;
3153:
3154: /* success */
3155: r = 0;
3156:
3157: out:
3158: sshbuf_free(kdf);
3159: sshbuf_free(encoded);
3160: sshbuf_free(encrypted);
1.36 djm 3161: cipher_free(ciphercontext);
1.1 djm 3162: explicit_bzero(salt, sizeof(salt));
1.100 jsg 3163: if (key != NULL)
3164: freezero(key, keylen + ivlen);
1.121 djm 3165: if (pubkeyblob != NULL)
1.100 jsg 3166: freezero(pubkeyblob, pubkeylen);
1.121 djm 3167: if (b64 != NULL)
1.100 jsg 3168: freezero(b64, strlen(b64));
1.1 djm 3169: return r;
3170: }
3171:
3172: static int
1.103 djm 3173: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 3174: {
3175: const u_char *cp;
3176: size_t encoded_len;
1.103 djm 3177: int r;
3178: u_char last;
1.1 djm 3179: struct sshbuf *encoded = NULL, *decoded = NULL;
3180:
1.103 djm 3181: if (blob == NULL || decodedp == NULL)
3182: return SSH_ERR_INVALID_ARGUMENT;
3183:
3184: *decodedp = NULL;
1.1 djm 3185:
3186: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 3187: (decoded = sshbuf_new()) == NULL) {
1.1 djm 3188: r = SSH_ERR_ALLOC_FAIL;
3189: goto out;
3190: }
3191:
3192: /* check preamble */
3193: cp = sshbuf_ptr(blob);
3194: encoded_len = sshbuf_len(blob);
3195: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3196: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3197: r = SSH_ERR_INVALID_FORMAT;
3198: goto out;
3199: }
3200: cp += MARK_BEGIN_LEN;
3201: encoded_len -= MARK_BEGIN_LEN;
3202:
3203: /* Look for end marker, removing whitespace as we go */
3204: while (encoded_len > 0) {
3205: if (*cp != '\n' && *cp != '\r') {
3206: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3207: goto out;
3208: }
3209: last = *cp;
3210: encoded_len--;
3211: cp++;
3212: if (last == '\n') {
3213: if (encoded_len >= MARK_END_LEN &&
3214: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3215: /* \0 terminate */
3216: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3217: goto out;
3218: break;
3219: }
3220: }
3221: }
3222: if (encoded_len == 0) {
3223: r = SSH_ERR_INVALID_FORMAT;
3224: goto out;
3225: }
3226:
3227: /* decode base64 */
1.4 djm 3228: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3229: goto out;
3230:
3231: /* check magic */
3232: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3233: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3234: r = SSH_ERR_INVALID_FORMAT;
3235: goto out;
3236: }
1.103 djm 3237: /* success */
3238: *decodedp = decoded;
3239: decoded = NULL;
3240: r = 0;
3241: out:
3242: sshbuf_free(encoded);
3243: sshbuf_free(decoded);
3244: return r;
3245: }
3246:
3247: static int
1.104 djm 3248: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
3249: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 3250: {
3251: char *ciphername = NULL, *kdfname = NULL;
3252: const struct sshcipher *cipher = NULL;
3253: int r = SSH_ERR_INTERNAL_ERROR;
3254: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3255: struct sshbuf *kdf = NULL, *decrypted = NULL;
3256: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 3257: struct sshkey *pubkey = NULL;
1.103 djm 3258: u_char *key = NULL, *salt = NULL, *dp;
3259: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3260:
1.104 djm 3261: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 3262: return SSH_ERR_INVALID_ARGUMENT;
3263:
3264: *decryptedp = NULL;
1.104 djm 3265: *pubkeyp = NULL;
1.103 djm 3266:
3267: if ((decrypted = sshbuf_new()) == NULL) {
3268: r = SSH_ERR_ALLOC_FAIL;
3269: goto out;
3270: }
3271:
1.1 djm 3272: /* parse public portion of key */
3273: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3274: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3275: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3276: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 3277: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3278: goto out;
3279:
3280: if (nkeys != 1) {
3281: /* XXX only one key supported at present */
3282: r = SSH_ERR_INVALID_FORMAT;
3283: goto out;
3284: }
3285:
1.104 djm 3286: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 3287: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3288: goto out;
3289:
3290: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3291: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3292: goto out;
3293: }
3294: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3295: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3296: goto out;
3297: }
1.101 markus 3298: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 3299: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 3300: goto out;
3301: }
3302: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3303: strcmp(kdfname, "none") != 0) {
3304: /* passphrase required */
3305: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 3306: goto out;
3307: }
3308:
3309: /* check size of encrypted key blob */
3310: blocksize = cipher_blocksize(cipher);
3311: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3312: r = SSH_ERR_INVALID_FORMAT;
3313: goto out;
3314: }
3315:
3316: /* setup key */
3317: keylen = cipher_keylen(cipher);
3318: ivlen = cipher_ivlen(cipher);
1.18 djm 3319: authlen = cipher_authlen(cipher);
1.1 djm 3320: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3321: r = SSH_ERR_ALLOC_FAIL;
3322: goto out;
3323: }
3324: if (strcmp(kdfname, "bcrypt") == 0) {
3325: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3326: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3327: goto out;
3328: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3329: key, keylen + ivlen, rounds) < 0) {
3330: r = SSH_ERR_INVALID_FORMAT;
3331: goto out;
3332: }
3333: }
3334:
1.18 djm 3335: /* check that an appropriate amount of auth data is present */
1.84 djm 3336: if (sshbuf_len(decoded) < authlen ||
3337: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 3338: r = SSH_ERR_INVALID_FORMAT;
3339: goto out;
3340: }
3341:
1.1 djm 3342: /* decrypt private portion of key */
3343: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3344: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3345: key + keylen, ivlen, 0)) != 0)
3346: goto out;
1.36 djm 3347: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3348: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3349: /* an integrity error here indicates an incorrect passphrase */
3350: if (r == SSH_ERR_MAC_INVALID)
3351: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3352: goto out;
3353: }
1.18 djm 3354: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3355: goto out;
3356: /* there should be no trailing data */
3357: if (sshbuf_len(decoded) != 0) {
3358: r = SSH_ERR_INVALID_FORMAT;
3359: goto out;
3360: }
3361:
3362: /* check check bytes */
3363: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3364: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3365: goto out;
3366: if (check1 != check2) {
3367: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3368: goto out;
3369: }
1.103 djm 3370: /* success */
3371: *decryptedp = decrypted;
3372: decrypted = NULL;
1.104 djm 3373: *pubkeyp = pubkey;
3374: pubkey = NULL;
1.103 djm 3375: r = 0;
3376: out:
3377: cipher_free(ciphercontext);
3378: free(ciphername);
3379: free(kdfname);
1.104 djm 3380: sshkey_free(pubkey);
1.103 djm 3381: if (salt != NULL) {
3382: explicit_bzero(salt, slen);
3383: free(salt);
3384: }
3385: if (key != NULL) {
3386: explicit_bzero(key, keylen + ivlen);
3387: free(key);
3388: }
3389: sshbuf_free(kdf);
3390: sshbuf_free(decrypted);
3391: return r;
3392: }
3393:
3394: static int
3395: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3396: struct sshkey **keyp, char **commentp)
3397: {
3398: char *comment = NULL;
3399: int r = SSH_ERR_INTERNAL_ERROR;
3400: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 3401: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 3402:
3403: if (keyp != NULL)
3404: *keyp = NULL;
3405: if (commentp != NULL)
3406: *commentp = NULL;
3407:
3408: /* Undo base64 encoding and decrypt the private section */
3409: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 3410: (r = private2_decrypt(decoded, passphrase,
3411: &decrypted, &pubkey)) != 0)
1.103 djm 3412: goto out;
1.105 djm 3413:
3414: if (type != KEY_UNSPEC &&
3415: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3416: r = SSH_ERR_KEY_TYPE_MISMATCH;
3417: goto out;
3418: }
1.103 djm 3419:
3420: /* Load the private key and comment */
3421: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3422: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3423: goto out;
3424:
3425: /* Check deterministic padding after private section */
3426: if ((r = private2_check_padding(decrypted)) != 0)
3427: goto out;
1.1 djm 3428:
1.104 djm 3429: /* Check that the public key in the envelope matches the private key */
3430: if (!sshkey_equal(pubkey, k)) {
3431: r = SSH_ERR_INVALID_FORMAT;
3432: goto out;
3433: }
1.1 djm 3434:
3435: /* success */
3436: r = 0;
3437: if (keyp != NULL) {
3438: *keyp = k;
3439: k = NULL;
3440: }
3441: if (commentp != NULL) {
3442: *commentp = comment;
3443: comment = NULL;
3444: }
3445: out:
3446: free(comment);
3447: sshbuf_free(decoded);
3448: sshbuf_free(decrypted);
3449: sshkey_free(k);
1.104 djm 3450: sshkey_free(pubkey);
1.1 djm 3451: return r;
3452: }
3453:
1.107 djm 3454: static int
3455: sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3456: struct sshkey **keyp)
3457: {
3458: int r = SSH_ERR_INTERNAL_ERROR;
3459: struct sshbuf *decoded = NULL;
3460: struct sshkey *pubkey = NULL;
3461: u_int nkeys = 0;
3462:
3463: if (keyp != NULL)
3464: *keyp = NULL;
3465:
3466: if ((r = private2_uudecode(blob, &decoded)) != 0)
3467: goto out;
3468: /* parse public key from unencrypted envelope */
3469: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3470: (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
3471: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
3472: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
3473: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3474: goto out;
3475:
3476: if (nkeys != 1) {
3477: /* XXX only one key supported at present */
3478: r = SSH_ERR_INVALID_FORMAT;
3479: goto out;
3480: }
3481:
3482: /* Parse the public key */
3483: if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3484: goto out;
3485:
3486: if (type != KEY_UNSPEC &&
3487: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3488: r = SSH_ERR_KEY_TYPE_MISMATCH;
3489: goto out;
3490: }
3491:
3492: /* success */
3493: r = 0;
3494: if (keyp != NULL) {
3495: *keyp = pubkey;
3496: pubkey = NULL;
3497: }
3498: out:
3499: sshbuf_free(decoded);
3500: sshkey_free(pubkey);
3501: return r;
3502: }
3503:
1.1 djm 3504: #ifdef WITH_OPENSSL
1.80 djm 3505: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3506: static int
1.80 djm 3507: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3508: int format, const char *_passphrase, const char *comment)
1.1 djm 3509: {
1.76 djm 3510: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3511: int success, r;
3512: int blen, len = strlen(_passphrase);
3513: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3514: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3515: char *bptr;
1.1 djm 3516: BIO *bio = NULL;
1.76 djm 3517: struct sshbuf *blob;
1.80 djm 3518: EVP_PKEY *pkey = NULL;
1.1 djm 3519:
3520: if (len > 0 && len <= 4)
3521: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3522: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3523: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3524: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3525: r = SSH_ERR_ALLOC_FAIL;
3526: goto out;
3527: }
3528: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3529: r = SSH_ERR_ALLOC_FAIL;
3530: goto out;
1.76 djm 3531: }
3532: if ((r = sshkey_unshield_private(key)) != 0)
3533: goto out;
1.1 djm 3534:
3535: switch (key->type) {
3536: case KEY_DSA:
1.80 djm 3537: if (format == SSHKEY_PRIVATE_PEM) {
3538: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3539: cipher, passphrase, len, NULL, NULL);
3540: } else {
3541: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3542: }
1.1 djm 3543: break;
3544: case KEY_ECDSA:
1.80 djm 3545: if (format == SSHKEY_PRIVATE_PEM) {
3546: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3547: cipher, passphrase, len, NULL, NULL);
3548: } else {
3549: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3550: }
1.1 djm 3551: break;
3552: case KEY_RSA:
1.80 djm 3553: if (format == SSHKEY_PRIVATE_PEM) {
3554: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3555: cipher, passphrase, len, NULL, NULL);
3556: } else {
3557: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3558: }
1.1 djm 3559: break;
3560: default:
3561: success = 0;
3562: break;
3563: }
3564: if (success == 0) {
3565: r = SSH_ERR_LIBCRYPTO_ERROR;
3566: goto out;
3567: }
1.80 djm 3568: if (format == SSHKEY_PRIVATE_PKCS8) {
3569: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3570: passphrase, len, NULL, NULL)) == 0) {
3571: r = SSH_ERR_LIBCRYPTO_ERROR;
3572: goto out;
3573: }
3574: }
1.1 djm 3575: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3576: r = SSH_ERR_INTERNAL_ERROR;
3577: goto out;
3578: }
3579: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3580: goto out;
3581: r = 0;
3582: out:
1.76 djm 3583: if (was_shielded)
3584: r = sshkey_shield_private(key);
3585: if (r == 0)
3586: r = sshbuf_putb(buf, blob);
1.80 djm 3587:
3588: EVP_PKEY_free(pkey);
1.76 djm 3589: sshbuf_free(blob);
1.1 djm 3590: BIO_free(bio);
3591: return r;
3592: }
3593: #endif /* WITH_OPENSSL */
3594:
3595: /* Serialise "key" to buffer "blob" */
3596: int
3597: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3598: const char *passphrase, const char *comment,
1.80 djm 3599: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 3600: {
3601: switch (key->type) {
1.9 markus 3602: #ifdef WITH_OPENSSL
1.1 djm 3603: case KEY_DSA:
3604: case KEY_ECDSA:
3605: case KEY_RSA:
1.80 djm 3606: break; /* see below */
1.1 djm 3607: #endif /* WITH_OPENSSL */
3608: case KEY_ED25519:
1.90 markus 3609: case KEY_ED25519_SK:
1.62 markus 3610: #ifdef WITH_XMSS
3611: case KEY_XMSS:
3612: #endif /* WITH_XMSS */
1.85 djm 3613: #ifdef WITH_OPENSSL
3614: case KEY_ECDSA_SK:
3615: #endif /* WITH_OPENSSL */
1.1 djm 3616: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 3617: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 3618: default:
3619: return SSH_ERR_KEY_TYPE_UNKNOWN;
3620: }
1.80 djm 3621:
3622: #ifdef WITH_OPENSSL
3623: switch (format) {
3624: case SSHKEY_PRIVATE_OPENSSH:
3625: return sshkey_private_to_blob2(key, blob, passphrase,
3626: comment, openssh_format_cipher, openssh_format_rounds);
3627: case SSHKEY_PRIVATE_PEM:
3628: case SSHKEY_PRIVATE_PKCS8:
3629: return sshkey_private_to_blob_pem_pkcs8(key, blob,
3630: format, passphrase, comment);
3631: default:
3632: return SSH_ERR_INVALID_ARGUMENT;
3633: }
3634: #endif /* WITH_OPENSSL */
1.1 djm 3635: }
3636:
3637: #ifdef WITH_OPENSSL
1.8 djm 3638: static int
1.52 djm 3639: translate_libcrypto_error(unsigned long pem_err)
3640: {
3641: int pem_reason = ERR_GET_REASON(pem_err);
3642:
3643: switch (ERR_GET_LIB(pem_err)) {
3644: case ERR_LIB_PEM:
3645: switch (pem_reason) {
3646: case PEM_R_BAD_PASSWORD_READ:
3647: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3648: case PEM_R_BAD_DECRYPT:
3649: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3650: default:
3651: return SSH_ERR_INVALID_FORMAT;
3652: }
3653: case ERR_LIB_EVP:
3654: switch (pem_reason) {
3655: case EVP_R_BAD_DECRYPT:
3656: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3657: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3658: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3659: #endif
1.52 djm 3660: case EVP_R_DECODE_ERROR:
3661: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3662: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3663: #endif
3664: return SSH_ERR_INVALID_FORMAT;
3665: default:
3666: return SSH_ERR_LIBCRYPTO_ERROR;
3667: }
3668: case ERR_LIB_ASN1:
3669: return SSH_ERR_INVALID_FORMAT;
3670: }
3671: return SSH_ERR_LIBCRYPTO_ERROR;
3672: }
3673:
3674: static void
3675: clear_libcrypto_errors(void)
3676: {
3677: while (ERR_get_error() != 0)
3678: ;
3679: }
3680:
3681: /*
3682: * Translate OpenSSL error codes to determine whether
3683: * passphrase is required/incorrect.
3684: */
3685: static int
3686: convert_libcrypto_error(void)
3687: {
3688: /*
3689: * Some password errors are reported at the beginning
3690: * of the error queue.
3691: */
3692: if (translate_libcrypto_error(ERR_peek_error()) ==
3693: SSH_ERR_KEY_WRONG_PASSPHRASE)
3694: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3695: return translate_libcrypto_error(ERR_peek_last_error());
3696: }
3697:
3698: static int
1.1 djm 3699: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3700: const char *passphrase, struct sshkey **keyp)
1.1 djm 3701: {
3702: EVP_PKEY *pk = NULL;
3703: struct sshkey *prv = NULL;
3704: BIO *bio = NULL;
3705: int r;
3706:
1.32 djm 3707: if (keyp != NULL)
3708: *keyp = NULL;
1.1 djm 3709:
3710: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3711: return SSH_ERR_ALLOC_FAIL;
3712: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3713: (int)sshbuf_len(blob)) {
3714: r = SSH_ERR_ALLOC_FAIL;
3715: goto out;
3716: }
3717:
1.52 djm 3718: clear_libcrypto_errors();
1.1 djm 3719: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3720: (char *)passphrase)) == NULL) {
1.116 djm 3721: /*
3722: * libcrypto may return various ASN.1 errors when attempting
3723: * to parse a key with an incorrect passphrase.
3724: * Treat all format errors as "incorrect passphrase" if a
3725: * passphrase was supplied.
3726: */
1.71 djm 3727: if (passphrase != NULL && *passphrase != '\0')
3728: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3729: else
3730: r = convert_libcrypto_error();
1.1 djm 3731: goto out;
3732: }
1.69 djm 3733: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3734: (type == KEY_UNSPEC || type == KEY_RSA)) {
3735: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3736: r = SSH_ERR_ALLOC_FAIL;
3737: goto out;
3738: }
3739: prv->rsa = EVP_PKEY_get1_RSA(pk);
3740: prv->type = KEY_RSA;
3741: #ifdef DEBUG_PK
3742: RSA_print_fp(stderr, prv->rsa, 8);
3743: #endif
3744: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3745: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3746: goto out;
3747: }
1.122 djm 3748: if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
1.1 djm 3749: goto out;
1.69 djm 3750: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3751: (type == KEY_UNSPEC || type == KEY_DSA)) {
3752: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3753: r = SSH_ERR_ALLOC_FAIL;
3754: goto out;
3755: }
3756: prv->dsa = EVP_PKEY_get1_DSA(pk);
3757: prv->type = KEY_DSA;
3758: #ifdef DEBUG_PK
3759: DSA_print_fp(stderr, prv->dsa, 8);
3760: #endif
1.69 djm 3761: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3762: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3763: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3764: r = SSH_ERR_ALLOC_FAIL;
3765: goto out;
3766: }
3767: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3768: prv->type = KEY_ECDSA;
3769: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3770: if (prv->ecdsa_nid == -1 ||
3771: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3772: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3773: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3774: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3775: r = SSH_ERR_INVALID_FORMAT;
3776: goto out;
3777: }
3778: #ifdef DEBUG_PK
3779: if (prv != NULL && prv->ecdsa != NULL)
3780: sshkey_dump_ec_key(prv->ecdsa);
3781: #endif
3782: } else {
3783: r = SSH_ERR_INVALID_FORMAT;
3784: goto out;
3785: }
3786: r = 0;
1.32 djm 3787: if (keyp != NULL) {
3788: *keyp = prv;
3789: prv = NULL;
3790: }
1.1 djm 3791: out:
3792: BIO_free(bio);
1.60 jsing 3793: EVP_PKEY_free(pk);
1.30 mmcc 3794: sshkey_free(prv);
1.1 djm 3795: return r;
3796: }
3797: #endif /* WITH_OPENSSL */
3798:
3799: int
3800: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3801: const char *passphrase, struct sshkey **keyp, char **commentp)
3802: {
1.42 djm 3803: int r = SSH_ERR_INTERNAL_ERROR;
3804:
1.32 djm 3805: if (keyp != NULL)
3806: *keyp = NULL;
1.1 djm 3807: if (commentp != NULL)
3808: *commentp = NULL;
3809:
3810: switch (type) {
3811: case KEY_ED25519:
1.62 markus 3812: case KEY_XMSS:
1.106 djm 3813: /* No fallback for new-format-only keys */
1.1 djm 3814: return sshkey_parse_private2(blob, type, passphrase,
3815: keyp, commentp);
1.106 djm 3816: default:
1.42 djm 3817: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3818: commentp);
1.106 djm 3819: /* Only fallback to PEM parser if a format error occurred. */
3820: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 3821: return r;
1.1 djm 3822: #ifdef WITH_OPENSSL
1.8 djm 3823: return sshkey_parse_private_pem_fileblob(blob, type,
3824: passphrase, keyp);
1.1 djm 3825: #else
3826: return SSH_ERR_INVALID_FORMAT;
3827: #endif /* WITH_OPENSSL */
3828: }
3829: }
3830:
3831: int
3832: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3833: struct sshkey **keyp, char **commentp)
1.1 djm 3834: {
3835: if (keyp != NULL)
3836: *keyp = NULL;
3837: if (commentp != NULL)
3838: *commentp = NULL;
3839:
1.23 tim 3840: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3841: passphrase, keyp, commentp);
1.96 djm 3842: }
3843:
3844: void
3845: sshkey_sig_details_free(struct sshkey_sig_details *details)
3846: {
3847: freezero(details, sizeof(*details));
1.107 djm 3848: }
3849:
3850: int
3851: sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
3852: struct sshkey **pubkeyp)
3853: {
3854: int r = SSH_ERR_INTERNAL_ERROR;
3855:
3856: if (pubkeyp != NULL)
3857: *pubkeyp = NULL;
3858: /* only new-format private keys bundle a public key inside */
3859: if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
3860: return r;
3861: return 0;
1.1 djm 3862: }
1.62 markus 3863:
3864: #ifdef WITH_XMSS
3865: /*
3866: * serialize the key with the current state and forward the state
3867: * maxsign times.
3868: */
3869: int
1.77 djm 3870: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3871: u_int32_t maxsign, int printerror)
1.62 markus 3872: {
3873: int r, rupdate;
3874:
3875: if (maxsign == 0 ||
3876: sshkey_type_plain(k->type) != KEY_XMSS)
3877: return sshkey_private_serialize_opt(k, b,
3878: SSHKEY_SERIALIZE_DEFAULT);
1.112 dtucker 3879: if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
1.62 markus 3880: (r = sshkey_private_serialize_opt(k, b,
3881: SSHKEY_SERIALIZE_STATE)) != 0 ||
3882: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3883: goto out;
3884: r = 0;
3885: out:
1.112 dtucker 3886: if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
1.62 markus 3887: if (r == 0)
3888: r = rupdate;
3889: }
3890: return r;
3891: }
3892:
3893: u_int32_t
3894: sshkey_signatures_left(const struct sshkey *k)
3895: {
3896: if (sshkey_type_plain(k->type) == KEY_XMSS)
3897: return sshkey_xmss_signatures_left(k);
3898: return 0;
3899: }
3900:
3901: int
3902: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3903: {
3904: if (sshkey_type_plain(k->type) != KEY_XMSS)
3905: return SSH_ERR_INVALID_ARGUMENT;
3906: return sshkey_xmss_enable_maxsign(k, maxsign);
3907: }
3908:
3909: int
3910: sshkey_set_filename(struct sshkey *k, const char *filename)
3911: {
3912: if (k == NULL)
3913: return SSH_ERR_INVALID_ARGUMENT;
3914: if (sshkey_type_plain(k->type) != KEY_XMSS)
3915: return 0;
3916: if (filename == NULL)
3917: return SSH_ERR_INVALID_ARGUMENT;
3918: if ((k->xmss_filename = strdup(filename)) == NULL)
3919: return SSH_ERR_ALLOC_FAIL;
3920: return 0;
3921: }
3922: #else
3923: int
1.76 djm 3924: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3925: u_int32_t maxsign, int printerror)
1.62 markus 3926: {
3927: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
3928: }
3929:
3930: u_int32_t
3931: sshkey_signatures_left(const struct sshkey *k)
3932: {
3933: return 0;
3934: }
3935:
3936: int
3937: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3938: {
3939: return SSH_ERR_INVALID_ARGUMENT;
3940: }
3941:
3942: int
3943: sshkey_set_filename(struct sshkey *k, const char *filename)
3944: {
3945: if (k == NULL)
3946: return SSH_ERR_INVALID_ARGUMENT;
3947: return 0;
3948: }
3949: #endif /* WITH_XMSS */
![[BACK]](/icons/back.gif){kind=icon}
Return to sshkey.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh