Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.130
1.130 ! djm 1: /* $OpenBSD: sshkey.c,v 1.129 2022/10/28 00:41:52 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:
430: #ifdef WITH_OPENSSL
431: /* XXX: these are really begging for a table-driven approach */
432: int
433: sshkey_curve_name_to_nid(const char *name)
434: {
435: if (strcmp(name, "nistp256") == 0)
436: return NID_X9_62_prime256v1;
437: else if (strcmp(name, "nistp384") == 0)
438: return NID_secp384r1;
439: else if (strcmp(name, "nistp521") == 0)
440: return NID_secp521r1;
441: else
442: return -1;
443: }
444:
445: u_int
446: sshkey_curve_nid_to_bits(int nid)
447: {
448: switch (nid) {
449: case NID_X9_62_prime256v1:
450: return 256;
451: case NID_secp384r1:
452: return 384;
453: case NID_secp521r1:
454: return 521;
455: default:
456: return 0;
457: }
458: }
459:
460: int
461: sshkey_ecdsa_bits_to_nid(int bits)
462: {
463: switch (bits) {
464: case 256:
465: return NID_X9_62_prime256v1;
466: case 384:
467: return NID_secp384r1;
468: case 521:
469: return NID_secp521r1;
470: default:
471: return -1;
472: }
473: }
474:
475: const char *
476: sshkey_curve_nid_to_name(int nid)
477: {
478: switch (nid) {
479: case NID_X9_62_prime256v1:
480: return "nistp256";
481: case NID_secp384r1:
482: return "nistp384";
483: case NID_secp521r1:
484: return "nistp521";
485: default:
486: return NULL;
487: }
488: }
489:
490: int
491: sshkey_ec_nid_to_hash_alg(int nid)
492: {
493: int kbits = sshkey_curve_nid_to_bits(nid);
494:
495: if (kbits <= 0)
496: return -1;
497:
498: /* RFC5656 section 6.2.1 */
499: if (kbits <= 256)
500: return SSH_DIGEST_SHA256;
501: else if (kbits <= 384)
502: return SSH_DIGEST_SHA384;
503: else
504: return SSH_DIGEST_SHA512;
505: }
506: #endif /* WITH_OPENSSL */
507:
508: static void
509: cert_free(struct sshkey_cert *cert)
510: {
511: u_int i;
512:
513: if (cert == NULL)
514: return;
1.31 mmcc 515: sshbuf_free(cert->certblob);
516: sshbuf_free(cert->critical);
517: sshbuf_free(cert->extensions);
1.29 mmcc 518: free(cert->key_id);
1.1 djm 519: for (i = 0; i < cert->nprincipals; i++)
520: free(cert->principals[i]);
1.29 mmcc 521: free(cert->principals);
1.30 mmcc 522: sshkey_free(cert->signature_key);
1.67 djm 523: free(cert->signature_type);
1.61 jsing 524: freezero(cert, sizeof(*cert));
1.1 djm 525: }
526:
527: static struct sshkey_cert *
528: cert_new(void)
529: {
530: struct sshkey_cert *cert;
531:
532: if ((cert = calloc(1, sizeof(*cert))) == NULL)
533: return NULL;
534: if ((cert->certblob = sshbuf_new()) == NULL ||
535: (cert->critical = sshbuf_new()) == NULL ||
536: (cert->extensions = sshbuf_new()) == NULL) {
537: cert_free(cert);
538: return NULL;
539: }
540: cert->key_id = NULL;
541: cert->principals = NULL;
542: cert->signature_key = NULL;
1.67 djm 543: cert->signature_type = NULL;
1.1 djm 544: return cert;
545: }
546:
547: struct sshkey *
548: sshkey_new(int type)
549: {
550: struct sshkey *k;
1.123 djm 551: const struct sshkey_impl *impl = NULL;
552:
553: if (type != KEY_UNSPEC &&
554: (impl = sshkey_impl_from_type(type)) == NULL)
555: return NULL;
1.1 djm 556:
1.123 djm 557: /* All non-certificate types may act as CAs */
1.1 djm 558: if ((k = calloc(1, sizeof(*k))) == NULL)
559: return NULL;
560: k->type = type;
561: k->ecdsa_nid = -1;
1.123 djm 562: if (impl != NULL && impl->funcs->alloc != NULL) {
563: if (impl->funcs->alloc(k) != 0) {
1.1 djm 564: free(k);
565: return NULL;
566: }
567: }
568: if (sshkey_is_cert(k)) {
569: if ((k->cert = cert_new()) == NULL) {
570: sshkey_free(k);
571: return NULL;
572: }
573: }
574:
575: return k;
576: }
577:
1.124 djm 578: /* Frees common FIDO fields */
579: void
580: sshkey_sk_cleanup(struct sshkey *k)
581: {
582: free(k->sk_application);
583: sshbuf_free(k->sk_key_handle);
584: sshbuf_free(k->sk_reserved);
585: k->sk_application = NULL;
586: k->sk_key_handle = k->sk_reserved = NULL;
587: }
588:
1.126 djm 589: static void
590: sshkey_free_contents(struct sshkey *k)
1.1 djm 591: {
1.123 djm 592: const struct sshkey_impl *impl;
593:
1.1 djm 594: if (k == NULL)
595: return;
1.123 djm 596: if ((impl = sshkey_impl_from_type(k->type)) != NULL &&
597: impl->funcs->cleanup != NULL)
598: impl->funcs->cleanup(k);
1.1 djm 599: if (sshkey_is_cert(k))
600: cert_free(k->cert);
1.76 djm 601: freezero(k->shielded_private, k->shielded_len);
602: freezero(k->shield_prekey, k->shield_prekey_len);
1.126 djm 603: }
604:
605: void
606: sshkey_free(struct sshkey *k)
607: {
608: sshkey_free_contents(k);
1.61 jsing 609: freezero(k, sizeof(*k));
1.1 djm 610: }
611:
612: static int
613: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
614: {
615: if (a == NULL && b == NULL)
616: return 1;
617: if (a == NULL || b == NULL)
618: return 0;
619: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
620: return 0;
621: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
622: sshbuf_len(a->certblob)) != 0)
623: return 0;
624: return 1;
625: }
626:
1.124 djm 627: /* Compares FIDO-specific pubkey fields only */
628: int
629: sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b)
630: {
631: if (a->sk_application == NULL || b->sk_application == NULL)
632: return 0;
633: if (strcmp(a->sk_application, b->sk_application) != 0)
634: return 0;
635: return 1;
636: }
637:
1.1 djm 638: /*
639: * Compare public portions of key only, allowing comparisons between
640: * certificates and plain keys too.
641: */
642: int
643: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
644: {
1.124 djm 645: const struct sshkey_impl *impl;
1.1 djm 646:
647: if (a == NULL || b == NULL ||
648: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
649: return 0;
1.124 djm 650: if ((impl = sshkey_impl_from_type(a->type)) == NULL)
1.1 djm 651: return 0;
1.124 djm 652: return impl->funcs->equal(a, b);
1.1 djm 653: }
654:
655: int
656: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
657: {
658: if (a == NULL || b == NULL || a->type != b->type)
659: return 0;
660: if (sshkey_is_cert(a)) {
661: if (!cert_compare(a->cert, b->cert))
662: return 0;
663: }
664: return sshkey_equal_public(a, b);
665: }
666:
1.125 djm 667:
668: /* Serialise common FIDO key parts */
669: int
670: sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b)
671: {
672: int r;
673:
674: if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0)
675: return r;
676:
677: return 0;
678: }
679:
1.1 djm 680: static int
1.62 markus 681: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
682: enum sshkey_serialize_rep opts)
1.1 djm 683: {
684: int type, ret = SSH_ERR_INTERNAL_ERROR;
685: const char *typename;
1.125 djm 686: const struct sshkey_impl *impl;
1.1 djm 687:
688: if (key == NULL)
689: return SSH_ERR_INVALID_ARGUMENT;
690:
1.125 djm 691: type = force_plain ? sshkey_type_plain(key->type) : key->type;
692:
693: if (sshkey_type_is_cert(type)) {
1.19 djm 694: if (key->cert == NULL)
695: return SSH_ERR_EXPECTED_CERT;
696: if (sshbuf_len(key->cert->certblob) == 0)
697: return SSH_ERR_KEY_LACKS_CERTBLOB;
1.1 djm 698: /* Use the existing blob */
699: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
700: return ret;
1.125 djm 701: return 0;
702: }
703: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 704: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.125 djm 705:
706: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
1.129 djm 707: if ((ret = sshbuf_put_cstring(b, typename)) != 0)
708: return ret;
709: return impl->funcs->serialize_public(key, b, opts);
1.1 djm 710: }
711:
712: int
1.14 djm 713: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 714: {
1.62 markus 715: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 716: }
717:
718: int
1.62 markus 719: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
720: enum sshkey_serialize_rep opts)
1.14 djm 721: {
722: struct sshbuf *tmp;
723: int r;
724:
725: if ((tmp = sshbuf_new()) == NULL)
726: return SSH_ERR_ALLOC_FAIL;
1.62 markus 727: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 728: if (r == 0)
729: r = sshbuf_put_stringb(b, tmp);
730: sshbuf_free(tmp);
731: return r;
732: }
733:
734: int
1.62 markus 735: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
736: {
737: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
738: }
739:
740: int
1.14 djm 741: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 742: {
1.62 markus 743: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 744: }
745:
746: static int
1.62 markus 747: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
748: enum sshkey_serialize_rep opts)
1.1 djm 749: {
750: int ret = SSH_ERR_INTERNAL_ERROR;
751: size_t len;
752: struct sshbuf *b = NULL;
753:
754: if (lenp != NULL)
755: *lenp = 0;
756: if (blobp != NULL)
757: *blobp = NULL;
758: if ((b = sshbuf_new()) == NULL)
759: return SSH_ERR_ALLOC_FAIL;
1.62 markus 760: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 761: goto out;
762: len = sshbuf_len(b);
763: if (lenp != NULL)
764: *lenp = len;
765: if (blobp != NULL) {
766: if ((*blobp = malloc(len)) == NULL) {
767: ret = SSH_ERR_ALLOC_FAIL;
768: goto out;
769: }
770: memcpy(*blobp, sshbuf_ptr(b), len);
771: }
772: ret = 0;
773: out:
774: sshbuf_free(b);
775: return ret;
776: }
777:
778: int
779: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
780: {
1.62 markus 781: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 782: }
783:
784: int
785: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
786: {
1.62 markus 787: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 788: }
789:
790: int
1.7 djm 791: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 792: u_char **retp, size_t *lenp)
793: {
794: u_char *blob = NULL, *ret = NULL;
795: size_t blob_len = 0;
1.7 djm 796: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 797:
798: if (retp != NULL)
799: *retp = NULL;
800: if (lenp != NULL)
801: *lenp = 0;
1.7 djm 802: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 803: r = SSH_ERR_INVALID_ARGUMENT;
804: goto out;
805: }
1.62 markus 806: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
807: != 0)
1.1 djm 808: goto out;
809: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
810: r = SSH_ERR_ALLOC_FAIL;
811: goto out;
812: }
1.7 djm 813: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 814: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
815: goto out;
816: /* success */
817: if (retp != NULL) {
818: *retp = ret;
819: ret = NULL;
820: }
821: if (lenp != NULL)
1.7 djm 822: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 823: r = 0;
824: out:
825: free(ret);
1.100 jsg 826: if (blob != NULL)
827: freezero(blob, blob_len);
1.1 djm 828: return r;
829: }
830:
831: static char *
1.7 djm 832: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
833: {
834: char *ret;
835: size_t plen = strlen(alg) + 1;
836: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
837:
838: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
839: return NULL;
840: strlcpy(ret, alg, rlen);
841: strlcat(ret, ":", rlen);
842: if (dgst_raw_len == 0)
843: return ret;
1.79 dtucker 844: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 845: freezero(ret, rlen);
1.7 djm 846: return NULL;
847: }
848: /* Trim padding characters from end */
849: ret[strcspn(ret, "=")] = '\0';
850: return ret;
851: }
852:
853: static char *
854: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 855: {
1.7 djm 856: char *retval, hex[5];
857: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 858:
1.7 djm 859: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 860: return NULL;
1.7 djm 861: strlcpy(retval, alg, rlen);
862: strlcat(retval, ":", rlen);
1.1 djm 863: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 864: snprintf(hex, sizeof(hex), "%s%02x",
865: i > 0 ? ":" : "", dgst_raw[i]);
866: strlcat(retval, hex, rlen);
1.1 djm 867: }
868: return retval;
869: }
870:
871: static char *
872: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
873: {
874: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
875: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
876: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
877: u_int i, j = 0, rounds, seed = 1;
878: char *retval;
879:
880: rounds = (dgst_raw_len / 2) + 1;
881: if ((retval = calloc(rounds, 6)) == NULL)
882: return NULL;
883: retval[j++] = 'x';
884: for (i = 0; i < rounds; i++) {
885: u_int idx0, idx1, idx2, idx3, idx4;
886: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
887: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
888: seed) % 6;
889: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
890: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
891: (seed / 6)) % 6;
892: retval[j++] = vowels[idx0];
893: retval[j++] = consonants[idx1];
894: retval[j++] = vowels[idx2];
895: if ((i + 1) < rounds) {
896: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
897: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
898: retval[j++] = consonants[idx3];
899: retval[j++] = '-';
900: retval[j++] = consonants[idx4];
901: seed = ((seed * 5) +
902: ((((u_int)(dgst_raw[2 * i])) * 7) +
903: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
904: }
905: } else {
906: idx0 = seed % 6;
907: idx1 = 16;
908: idx2 = seed / 6;
909: retval[j++] = vowels[idx0];
910: retval[j++] = consonants[idx1];
911: retval[j++] = vowels[idx2];
912: }
913: }
914: retval[j++] = 'x';
915: retval[j++] = '\0';
916: return retval;
917: }
918:
919: /*
920: * Draw an ASCII-Art representing the fingerprint so human brain can
921: * profit from its built-in pattern recognition ability.
922: * This technique is called "random art" and can be found in some
923: * scientific publications like this original paper:
924: *
925: * "Hash Visualization: a New Technique to improve Real-World Security",
926: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
927: * Techniques and E-Commerce (CrypTEC '99)
928: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
929: *
930: * The subject came up in a talk by Dan Kaminsky, too.
931: *
932: * If you see the picture is different, the key is different.
933: * If the picture looks the same, you still know nothing.
934: *
935: * The algorithm used here is a worm crawling over a discrete plane,
936: * leaving a trace (augmenting the field) everywhere it goes.
937: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
938: * makes the respective movement vector be ignored for this turn.
939: * Graphs are not unambiguous, because circles in graphs can be
940: * walked in either direction.
941: */
942:
943: /*
944: * Field sizes for the random art. Have to be odd, so the starting point
945: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
946: * Else pictures would be too dense, and drawing the frame would
947: * fail, too, because the key type would not fit in anymore.
948: */
949: #define FLDBASE 8
950: #define FLDSIZE_Y (FLDBASE + 1)
951: #define FLDSIZE_X (FLDBASE * 2 + 1)
952: static char *
1.7 djm 953: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 954: const struct sshkey *k)
955: {
956: /*
957: * Chars to be used after each other every time the worm
958: * intersects with itself. Matter of taste.
959: */
960: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 961: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 962: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 963: size_t i, tlen, hlen;
1.1 djm 964: u_int b;
1.3 djm 965: int x, y, r;
1.1 djm 966: size_t len = strlen(augmentation_string) - 1;
967:
968: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
969: return NULL;
970:
971: /* initialize field */
972: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
973: x = FLDSIZE_X / 2;
974: y = FLDSIZE_Y / 2;
975:
976: /* process raw key */
977: for (i = 0; i < dgst_raw_len; i++) {
978: int input;
979: /* each byte conveys four 2-bit move commands */
980: input = dgst_raw[i];
981: for (b = 0; b < 4; b++) {
982: /* evaluate 2 bit, rest is shifted later */
983: x += (input & 0x1) ? 1 : -1;
984: y += (input & 0x2) ? 1 : -1;
985:
986: /* assure we are still in bounds */
1.37 deraadt 987: x = MAXIMUM(x, 0);
988: y = MAXIMUM(y, 0);
989: x = MINIMUM(x, FLDSIZE_X - 1);
990: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 991:
992: /* augment the field */
993: if (field[x][y] < len - 2)
994: field[x][y]++;
995: input = input >> 2;
996: }
997: }
998:
999: /* mark starting point and end point*/
1000: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1001: field[x][y] = len;
1002:
1.3 djm 1003: /* assemble title */
1004: r = snprintf(title, sizeof(title), "[%s %u]",
1005: sshkey_type(k), sshkey_size(k));
1006: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1007: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1008: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1009: tlen = (r <= 0) ? 0 : strlen(title);
1010:
1011: /* assemble hash ID. */
1012: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1013: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1014:
1015: /* output upper border */
1.3 djm 1016: p = retval;
1017: *p++ = '+';
1018: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1019: *p++ = '-';
1020: memcpy(p, title, tlen);
1021: p += tlen;
1.7 djm 1022: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1023: *p++ = '-';
1024: *p++ = '+';
1025: *p++ = '\n';
1026:
1027: /* output content */
1028: for (y = 0; y < FLDSIZE_Y; y++) {
1029: *p++ = '|';
1030: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1031: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1032: *p++ = '|';
1033: *p++ = '\n';
1034: }
1035:
1036: /* output lower border */
1037: *p++ = '+';
1.7 djm 1038: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1039: *p++ = '-';
1040: memcpy(p, hash, hlen);
1041: p += hlen;
1042: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1043: *p++ = '-';
1044: *p++ = '+';
1045:
1046: return retval;
1047: }
1048:
1049: char *
1.7 djm 1050: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1051: enum sshkey_fp_rep dgst_rep)
1052: {
1053: char *retval = NULL;
1054: u_char *dgst_raw;
1055: size_t dgst_raw_len;
1056:
1.7 djm 1057: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1058: return NULL;
1059: switch (dgst_rep) {
1.7 djm 1060: case SSH_FP_DEFAULT:
1061: if (dgst_alg == SSH_DIGEST_MD5) {
1062: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1063: dgst_raw, dgst_raw_len);
1064: } else {
1065: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1066: dgst_raw, dgst_raw_len);
1067: }
1068: break;
1.1 djm 1069: case SSH_FP_HEX:
1.7 djm 1070: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1071: dgst_raw, dgst_raw_len);
1072: break;
1073: case SSH_FP_BASE64:
1074: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1075: dgst_raw, dgst_raw_len);
1.1 djm 1076: break;
1077: case SSH_FP_BUBBLEBABBLE:
1078: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1079: break;
1080: case SSH_FP_RANDOMART:
1.7 djm 1081: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1082: dgst_raw, dgst_raw_len, k);
1.1 djm 1083: break;
1084: default:
1.100 jsg 1085: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1086: return NULL;
1087: }
1.100 jsg 1088: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1089: return retval;
1090: }
1091:
1.63 djm 1092: static int
1093: peek_type_nid(const char *s, size_t l, int *nid)
1094: {
1.123 djm 1095: const struct sshkey_impl *impl;
1096: int i;
1.63 djm 1097:
1.123 djm 1098: for (i = 0; keyimpls[i] != NULL; i++) {
1099: impl = keyimpls[i];
1100: if (impl->name == NULL || strlen(impl->name) != l)
1.63 djm 1101: continue;
1.123 djm 1102: if (memcmp(s, impl->name, l) == 0) {
1.63 djm 1103: *nid = -1;
1.123 djm 1104: if (key_type_is_ecdsa_variant(impl->type))
1105: *nid = impl->nid;
1106: return impl->type;
1.63 djm 1107: }
1108: }
1109: return KEY_UNSPEC;
1110: }
1.1 djm 1111:
1.63 djm 1112: /* XXX this can now be made const char * */
1.1 djm 1113: int
1114: sshkey_read(struct sshkey *ret, char **cpp)
1115: {
1116: struct sshkey *k;
1.63 djm 1117: char *cp, *blobcopy;
1118: size_t space;
1.1 djm 1119: int r, type, curve_nid = -1;
1120: struct sshbuf *blob;
1.44 dtucker 1121:
1122: if (ret == NULL)
1123: return SSH_ERR_INVALID_ARGUMENT;
1.126 djm 1124: if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL)
1.63 djm 1125: return SSH_ERR_INVALID_ARGUMENT;
1126:
1127: /* Decode type */
1128: cp = *cpp;
1129: space = strcspn(cp, " \t");
1130: if (space == strlen(cp))
1131: return SSH_ERR_INVALID_FORMAT;
1132: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1133: return SSH_ERR_INVALID_FORMAT;
1134:
1135: /* skip whitespace */
1136: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1137: ;
1138: if (*cp == '\0')
1139: return SSH_ERR_INVALID_FORMAT;
1140: if (ret->type != KEY_UNSPEC && ret->type != type)
1141: return SSH_ERR_KEY_TYPE_MISMATCH;
1142: if ((blob = sshbuf_new()) == NULL)
1143: return SSH_ERR_ALLOC_FAIL;
1144:
1145: /* find end of keyblob and decode */
1146: space = strcspn(cp, " \t");
1147: if ((blobcopy = strndup(cp, space)) == NULL) {
1148: sshbuf_free(blob);
1149: return SSH_ERR_ALLOC_FAIL;
1150: }
1151: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1152: free(blobcopy);
1153: sshbuf_free(blob);
1154: return r;
1155: }
1156: free(blobcopy);
1157: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1158: sshbuf_free(blob);
1.63 djm 1159: return r;
1160: }
1161: sshbuf_free(blob);
1162:
1163: /* skip whitespace and leave cp at start of comment */
1164: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1165: ;
1166:
1167: /* ensure type of blob matches type at start of line */
1168: if (k->type != type) {
1169: sshkey_free(k);
1170: return SSH_ERR_KEY_TYPE_MISMATCH;
1171: }
1.85 djm 1172: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1173: sshkey_free(k);
1174: return SSH_ERR_EC_CURVE_MISMATCH;
1175: }
1176:
1177: /* Fill in ret from parsed key */
1.126 djm 1178: sshkey_free_contents(ret);
1179: *ret = *k;
1180: freezero(k, sizeof(*k));
1.63 djm 1181:
1182: /* success */
1183: *cpp = cp;
1184: return 0;
1.1 djm 1185: }
1186:
1187: int
1.19 djm 1188: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1189: {
1.19 djm 1190: int r = SSH_ERR_INTERNAL_ERROR;
1191: struct sshbuf *b = NULL;
1.1 djm 1192: char *uu = NULL;
1.19 djm 1193:
1194: if (b64p != NULL)
1195: *b64p = NULL;
1196: if ((b = sshbuf_new()) == NULL)
1197: return SSH_ERR_ALLOC_FAIL;
1198: if ((r = sshkey_putb(key, b)) != 0)
1199: goto out;
1.81 djm 1200: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1201: r = SSH_ERR_ALLOC_FAIL;
1202: goto out;
1203: }
1204: /* Success */
1205: if (b64p != NULL) {
1206: *b64p = uu;
1207: uu = NULL;
1208: }
1209: r = 0;
1210: out:
1211: sshbuf_free(b);
1212: free(uu);
1213: return r;
1214: }
1215:
1.52 djm 1216: int
1.19 djm 1217: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1218: {
1219: int r = SSH_ERR_INTERNAL_ERROR;
1220: char *uu = NULL;
1221:
1.48 djm 1222: if ((r = sshkey_to_base64(key, &uu)) != 0)
1223: goto out;
1224: if ((r = sshbuf_putf(b, "%s %s",
1225: sshkey_ssh_name(key), uu)) != 0)
1226: goto out;
1.19 djm 1227: r = 0;
1228: out:
1229: free(uu);
1230: return r;
1231: }
1232:
1233: int
1234: sshkey_write(const struct sshkey *key, FILE *f)
1235: {
1236: struct sshbuf *b = NULL;
1237: int r = SSH_ERR_INTERNAL_ERROR;
1238:
1239: if ((b = sshbuf_new()) == NULL)
1240: return SSH_ERR_ALLOC_FAIL;
1241: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1242: goto out;
1243: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1244: if (feof(f))
1245: errno = EPIPE;
1.19 djm 1246: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1247: goto out;
1248: }
1.19 djm 1249: /* Success */
1250: r = 0;
1.1 djm 1251: out:
1.19 djm 1252: sshbuf_free(b);
1253: return r;
1.1 djm 1254: }
1255:
1256: const char *
1257: sshkey_cert_type(const struct sshkey *k)
1258: {
1259: switch (k->cert->type) {
1260: case SSH2_CERT_TYPE_USER:
1261: return "user";
1262: case SSH2_CERT_TYPE_HOST:
1263: return "host";
1264: default:
1265: return "unknown";
1266: }
1267: }
1268:
1269: #ifdef WITH_OPENSSL
1270: int
1271: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1272: {
1273: EC_GROUP *eg;
1274: int nids[] = {
1275: NID_X9_62_prime256v1,
1276: NID_secp384r1,
1277: NID_secp521r1,
1278: -1
1279: };
1280: int nid;
1281: u_int i;
1282: const EC_GROUP *g = EC_KEY_get0_group(k);
1283:
1284: /*
1285: * The group may be stored in a ASN.1 encoded private key in one of two
1286: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1287: * or explicit group parameters encoded into the key blob. Only the
1288: * "named group" case sets the group NID for us, but we can figure
1289: * it out for the other case by comparing against all the groups that
1290: * are supported.
1291: */
1292: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1293: return nid;
1294: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1295: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1296: return -1;
1.93 djm 1297: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1298: break;
1299: EC_GROUP_free(eg);
1300: }
1301: if (nids[i] != -1) {
1302: /* Use the group with the NID attached */
1303: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1304: if (EC_KEY_set_group(k, eg) != 1) {
1305: EC_GROUP_free(eg);
1306: return -1;
1307: }
1308: }
1309: return nids[i];
1310: }
1311:
1312: #endif /* WITH_OPENSSL */
1313:
1314: int
1315: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1316: {
1317: struct sshkey *k;
1318: int ret = SSH_ERR_INTERNAL_ERROR;
1.127 djm 1319: const struct sshkey_impl *impl;
1.1 djm 1320:
1.127 djm 1321: if (keyp == NULL || sshkey_type_is_cert(type))
1.1 djm 1322: return SSH_ERR_INVALID_ARGUMENT;
1323: *keyp = NULL;
1.127 djm 1324: if ((impl = sshkey_impl_from_type(type)) == NULL)
1325: return SSH_ERR_KEY_TYPE_UNKNOWN;
1326: if (impl->funcs->generate == NULL)
1327: return SSH_ERR_FEATURE_UNSUPPORTED;
1.1 djm 1328: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1329: return SSH_ERR_ALLOC_FAIL;
1.127 djm 1330: k->type = type;
1331: if ((ret = impl->funcs->generate(k, bits)) != 0) {
1332: sshkey_free(k);
1333: return ret;
1.1 djm 1334: }
1.127 djm 1335: /* success */
1336: *keyp = k;
1337: return 0;
1.1 djm 1338: }
1339:
1340: int
1341: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1342: {
1343: u_int i;
1344: const struct sshkey_cert *from;
1345: struct sshkey_cert *to;
1.67 djm 1346: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1347:
1.67 djm 1348: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1349: return SSH_ERR_INVALID_ARGUMENT;
1350:
1.67 djm 1351: if ((to = cert_new()) == NULL)
1.1 djm 1352: return SSH_ERR_ALLOC_FAIL;
1353:
1.67 djm 1354: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1355: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1356: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1357: goto out;
1.1 djm 1358:
1359: to->serial = from->serial;
1360: to->type = from->type;
1361: if (from->key_id == NULL)
1362: to->key_id = NULL;
1.67 djm 1363: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1364: r = SSH_ERR_ALLOC_FAIL;
1365: goto out;
1366: }
1.1 djm 1367: to->valid_after = from->valid_after;
1368: to->valid_before = from->valid_before;
1369: if (from->signature_key == NULL)
1370: to->signature_key = NULL;
1.67 djm 1371: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1372: &to->signature_key)) != 0)
1.67 djm 1373: goto out;
1374: if (from->signature_type != NULL &&
1375: (to->signature_type = strdup(from->signature_type)) == NULL) {
1376: r = SSH_ERR_ALLOC_FAIL;
1377: goto out;
1378: }
1379: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1380: r = SSH_ERR_INVALID_ARGUMENT;
1381: goto out;
1382: }
1.1 djm 1383: if (from->nprincipals > 0) {
1384: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1385: sizeof(*to->principals))) == NULL) {
1386: r = SSH_ERR_ALLOC_FAIL;
1387: goto out;
1388: }
1.1 djm 1389: for (i = 0; i < from->nprincipals; i++) {
1390: to->principals[i] = strdup(from->principals[i]);
1391: if (to->principals[i] == NULL) {
1392: to->nprincipals = i;
1.67 djm 1393: r = SSH_ERR_ALLOC_FAIL;
1394: goto out;
1.1 djm 1395: }
1396: }
1397: }
1398: to->nprincipals = from->nprincipals;
1.67 djm 1399:
1400: /* success */
1401: cert_free(to_key->cert);
1402: to_key->cert = to;
1403: to = NULL;
1404: r = 0;
1405: out:
1406: cert_free(to);
1407: return r;
1.1 djm 1408: }
1409:
1410: int
1.128 djm 1411: sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to)
1412: {
1413: /* Append security-key application string */
1414: if ((to->sk_application = strdup(from->sk_application)) == NULL)
1415: return SSH_ERR_ALLOC_FAIL;
1416: return 0;
1417: }
1418:
1419: int
1.1 djm 1420: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1421: {
1422: struct sshkey *n = NULL;
1.69 djm 1423: int r = SSH_ERR_INTERNAL_ERROR;
1.128 djm 1424: const struct sshkey_impl *impl;
1.1 djm 1425:
1.24 djm 1426: *pkp = NULL;
1.128 djm 1427: if ((impl = sshkey_impl_from_key(k)) == NULL)
1428: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.85 djm 1429: if ((n = sshkey_new(k->type)) == NULL) {
1430: r = SSH_ERR_ALLOC_FAIL;
1431: goto out;
1432: }
1.128 djm 1433: if ((r = impl->funcs->copy_public(k, n)) != 0)
1.69 djm 1434: goto out;
1435: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1436: goto out;
1437: /* success */
1.1 djm 1438: *pkp = n;
1.69 djm 1439: n = NULL;
1440: r = 0;
1441: out:
1442: sshkey_free(n);
1443: return r;
1.1 djm 1444: }
1445:
1.76 djm 1446: int
1447: sshkey_is_shielded(struct sshkey *k)
1448: {
1449: return k != NULL && k->shielded_private != NULL;
1450: }
1451:
1452: int
1453: sshkey_shield_private(struct sshkey *k)
1454: {
1455: struct sshbuf *prvbuf = NULL;
1456: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1457: struct sshcipher_ctx *cctx = NULL;
1458: const struct sshcipher *cipher;
1459: size_t i, enclen = 0;
1460: struct sshkey *kswap = NULL, tmp;
1461: int r = SSH_ERR_INTERNAL_ERROR;
1462:
1463: #ifdef DEBUG_PK
1464: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1465: #endif
1466: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1467: r = SSH_ERR_INVALID_ARGUMENT;
1468: goto out;
1469: }
1470: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1471: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1472: r = SSH_ERR_INTERNAL_ERROR;
1473: goto out;
1474: }
1475:
1476: /* Prepare a random pre-key, and from it an ephemeral key */
1477: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1478: r = SSH_ERR_ALLOC_FAIL;
1479: goto out;
1480: }
1481: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1482: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1483: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1484: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1485: goto out;
1486: #ifdef DEBUG_PK
1487: fprintf(stderr, "%s: key+iv\n", __func__);
1488: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1489: stderr);
1490: #endif
1491: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1492: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1493: goto out;
1494:
1495: /* Serialise and encrypt the private key using the ephemeral key */
1496: if ((prvbuf = sshbuf_new()) == NULL) {
1497: r = SSH_ERR_ALLOC_FAIL;
1498: goto out;
1499: }
1500: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1501: goto out;
1502: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.116 djm 1503: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 1504: goto out;
1505: /* pad to cipher blocksize */
1506: i = 0;
1507: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1508: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1509: goto out;
1510: }
1511: #ifdef DEBUG_PK
1512: fprintf(stderr, "%s: serialised\n", __func__);
1513: sshbuf_dump(prvbuf, stderr);
1514: #endif
1515: /* encrypt */
1516: enclen = sshbuf_len(prvbuf);
1517: if ((enc = malloc(enclen)) == NULL) {
1518: r = SSH_ERR_ALLOC_FAIL;
1519: goto out;
1520: }
1521: if ((r = cipher_crypt(cctx, 0, enc,
1522: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1523: goto out;
1524: #ifdef DEBUG_PK
1525: fprintf(stderr, "%s: encrypted\n", __func__);
1526: sshbuf_dump_data(enc, enclen, stderr);
1527: #endif
1528:
1529: /* Make a scrubbed, public-only copy of our private key argument */
1530: if ((r = sshkey_from_private(k, &kswap)) != 0)
1531: goto out;
1532:
1533: /* Swap the private key out (it will be destroyed below) */
1534: tmp = *kswap;
1535: *kswap = *k;
1536: *k = tmp;
1537:
1538: /* Insert the shielded key into our argument */
1539: k->shielded_private = enc;
1540: k->shielded_len = enclen;
1541: k->shield_prekey = prekey;
1542: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1543: enc = prekey = NULL; /* transferred */
1544: enclen = 0;
1.99 djm 1545:
1546: /* preserve key fields that are required for correct operation */
1547: k->sk_flags = kswap->sk_flags;
1.76 djm 1548:
1549: /* success */
1550: r = 0;
1551:
1552: out:
1553: /* XXX behaviour on error - invalidate original private key? */
1554: cipher_free(cctx);
1555: explicit_bzero(keyiv, sizeof(keyiv));
1556: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1557: freezero(enc, enclen);
1.76 djm 1558: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1559: sshkey_free(kswap);
1560: sshbuf_free(prvbuf);
1561: return r;
1562: }
1563:
1.121 djm 1564: /* Check deterministic padding after private key */
1565: static int
1566: private2_check_padding(struct sshbuf *decrypted)
1567: {
1568: u_char pad;
1569: size_t i;
1570: int r;
1571:
1572: i = 0;
1573: while (sshbuf_len(decrypted)) {
1574: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1575: goto out;
1576: if (pad != (++i & 0xff)) {
1577: r = SSH_ERR_INVALID_FORMAT;
1578: goto out;
1579: }
1580: }
1581: /* success */
1582: r = 0;
1583: out:
1584: explicit_bzero(&pad, sizeof(pad));
1585: explicit_bzero(&i, sizeof(i));
1586: return r;
1587: }
1588:
1.76 djm 1589: int
1590: sshkey_unshield_private(struct sshkey *k)
1591: {
1592: struct sshbuf *prvbuf = NULL;
1.121 djm 1593: u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1.76 djm 1594: struct sshcipher_ctx *cctx = NULL;
1595: const struct sshcipher *cipher;
1596: struct sshkey *kswap = NULL, tmp;
1597: int r = SSH_ERR_INTERNAL_ERROR;
1598:
1599: #ifdef DEBUG_PK
1600: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1601: #endif
1602: if (!sshkey_is_shielded(k))
1603: return 0; /* nothing to do */
1604:
1605: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1606: r = SSH_ERR_INVALID_ARGUMENT;
1607: goto out;
1608: }
1609: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1610: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1611: r = SSH_ERR_INTERNAL_ERROR;
1612: goto out;
1613: }
1614: /* check size of shielded key blob */
1615: if (k->shielded_len < cipher_blocksize(cipher) ||
1616: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1617: r = SSH_ERR_INVALID_FORMAT;
1618: goto out;
1619: }
1620:
1621: /* Calculate the ephemeral key from the prekey */
1622: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1623: k->shield_prekey, k->shield_prekey_len,
1624: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1625: goto out;
1626: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1627: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1628: goto out;
1629: #ifdef DEBUG_PK
1630: fprintf(stderr, "%s: key+iv\n", __func__);
1631: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1632: stderr);
1633: #endif
1634:
1635: /* Decrypt and parse the shielded private key using the ephemeral key */
1636: if ((prvbuf = sshbuf_new()) == NULL) {
1637: r = SSH_ERR_ALLOC_FAIL;
1638: goto out;
1639: }
1640: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
1641: goto out;
1642: /* decrypt */
1643: #ifdef DEBUG_PK
1644: fprintf(stderr, "%s: encrypted\n", __func__);
1645: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
1646: #endif
1647: if ((r = cipher_crypt(cctx, 0, cp,
1648: k->shielded_private, k->shielded_len, 0, 0)) != 0)
1649: goto out;
1650: #ifdef DEBUG_PK
1651: fprintf(stderr, "%s: serialised\n", __func__);
1652: sshbuf_dump(prvbuf, stderr);
1653: #endif
1654: /* Parse private key */
1655: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
1656: goto out;
1.121 djm 1657:
1658: if ((r = private2_check_padding(prvbuf)) != 0)
1659: goto out;
1.76 djm 1660:
1661: /* Swap the parsed key back into place */
1662: tmp = *kswap;
1663: *kswap = *k;
1664: *k = tmp;
1665:
1666: /* success */
1667: r = 0;
1668:
1669: out:
1670: cipher_free(cctx);
1671: explicit_bzero(keyiv, sizeof(keyiv));
1672: explicit_bzero(&tmp, sizeof(tmp));
1673: sshkey_free(kswap);
1674: sshbuf_free(prvbuf);
1675: return r;
1676: }
1677:
1.1 djm 1678: static int
1.14 djm 1679: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1680: {
1.14 djm 1681: struct sshbuf *principals = NULL, *crit = NULL;
1682: struct sshbuf *exts = NULL, *ca = NULL;
1683: u_char *sig = NULL;
1684: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1685: int ret = SSH_ERR_INTERNAL_ERROR;
1686:
1687: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1688: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1689: return ret;
1690:
1.20 djm 1691: /* Parse body of certificate up to signature */
1692: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1693: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1694: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1695: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1696: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1697: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1698: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1699: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1700: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1701: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1702: /* XXX debug print error for ret */
1703: ret = SSH_ERR_INVALID_FORMAT;
1704: goto out;
1705: }
1706:
1707: /* Signature is left in the buffer so we can calculate this length */
1708: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1709:
1710: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1711: ret = SSH_ERR_INVALID_FORMAT;
1712: goto out;
1713: }
1714:
1715: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1716: key->cert->type != SSH2_CERT_TYPE_HOST) {
1717: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1718: goto out;
1719: }
1720:
1.4 djm 1721: /* Parse principals section */
1722: while (sshbuf_len(principals) > 0) {
1723: char *principal = NULL;
1724: char **oprincipals = NULL;
1725:
1.1 djm 1726: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1727: ret = SSH_ERR_INVALID_FORMAT;
1728: goto out;
1729: }
1.4 djm 1730: if ((ret = sshbuf_get_cstring(principals, &principal,
1731: NULL)) != 0) {
1.1 djm 1732: ret = SSH_ERR_INVALID_FORMAT;
1733: goto out;
1734: }
1735: oprincipals = key->cert->principals;
1.51 deraadt 1736: key->cert->principals = recallocarray(key->cert->principals,
1737: key->cert->nprincipals, key->cert->nprincipals + 1,
1738: sizeof(*key->cert->principals));
1.1 djm 1739: if (key->cert->principals == NULL) {
1740: free(principal);
1741: key->cert->principals = oprincipals;
1742: ret = SSH_ERR_ALLOC_FAIL;
1743: goto out;
1744: }
1745: key->cert->principals[key->cert->nprincipals++] = principal;
1746: }
1747:
1.4 djm 1748: /*
1749: * Stash a copies of the critical options and extensions sections
1750: * for later use.
1751: */
1752: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1753: (exts != NULL &&
1754: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1755: goto out;
1756:
1.4 djm 1757: /*
1758: * Validate critical options and extensions sections format.
1759: */
1760: while (sshbuf_len(crit) != 0) {
1761: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1762: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1763: sshbuf_reset(key->cert->critical);
1.1 djm 1764: ret = SSH_ERR_INVALID_FORMAT;
1765: goto out;
1766: }
1767: }
1.4 djm 1768: while (exts != NULL && sshbuf_len(exts) != 0) {
1769: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1770: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1771: sshbuf_reset(key->cert->extensions);
1.1 djm 1772: ret = SSH_ERR_INVALID_FORMAT;
1773: goto out;
1774: }
1775: }
1776:
1.4 djm 1777: /* Parse CA key and check signature */
1.14 djm 1778: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1779: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1780: goto out;
1781: }
1782: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1783: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1784: goto out;
1785: }
1786: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 1787: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 1788: goto out;
1.82 djm 1789: if ((ret = sshkey_get_sigtype(sig, slen,
1790: &key->cert->signature_type)) != 0)
1.67 djm 1791: goto out;
1.4 djm 1792:
1793: /* Success */
1.1 djm 1794: ret = 0;
1795: out:
1.14 djm 1796: sshbuf_free(ca);
1.4 djm 1797: sshbuf_free(crit);
1798: sshbuf_free(exts);
1799: sshbuf_free(principals);
1.1 djm 1800: free(sig);
1801: return ret;
1802: }
1803:
1.122 djm 1804: int
1.129 djm 1805: sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key)
1.122 djm 1806: {
1.129 djm 1807: /* Parse additional security-key application string */
1808: if (sshbuf_get_cstring(b, &key->sk_application, NULL) != 0)
1809: return SSH_ERR_INVALID_FORMAT;
1.69 djm 1810: return 0;
1811: }
1812:
1813: static int
1.14 djm 1814: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1815: int allow_cert)
1.1 djm 1816: {
1.12 djm 1817: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.129 djm 1818: char *ktype = NULL;
1.1 djm 1819: struct sshkey *key = NULL;
1.14 djm 1820: struct sshbuf *copy;
1.129 djm 1821: const struct sshkey_impl *impl;
1.1 djm 1822:
1823: #ifdef DEBUG_PK /* XXX */
1.14 djm 1824: sshbuf_dump(b, stderr);
1.1 djm 1825: #endif
1.32 djm 1826: if (keyp != NULL)
1827: *keyp = NULL;
1.14 djm 1828: if ((copy = sshbuf_fromb(b)) == NULL) {
1829: ret = SSH_ERR_ALLOC_FAIL;
1830: goto out;
1831: }
1.1 djm 1832: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1833: ret = SSH_ERR_INVALID_FORMAT;
1834: goto out;
1835: }
1836:
1837: type = sshkey_type_from_name(ktype);
1838: if (!allow_cert && sshkey_type_is_cert(type)) {
1839: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1840: goto out;
1841: }
1.129 djm 1842: if ((impl = sshkey_impl_from_type(type)) == NULL) {
1843: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1844: goto out;
1845: }
1846: if ((key = sshkey_new(type)) == NULL) {
1847: ret = SSH_ERR_ALLOC_FAIL;
1848: goto out;
1849: }
1850: if (sshkey_type_is_cert(type)) {
1851: /* Skip nonce that preceeds all certificates */
1.1 djm 1852: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1853: ret = SSH_ERR_INVALID_FORMAT;
1854: goto out;
1855: }
1.129 djm 1856: }
1857: if ((ret = impl->funcs->deserialize_public(ktype, b, key)) != 0)
1.1 djm 1858: goto out;
1859:
1860: /* Parse certificate potion */
1.14 djm 1861: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 1862: goto out;
1863:
1864: if (key != NULL && sshbuf_len(b) != 0) {
1865: ret = SSH_ERR_INVALID_FORMAT;
1866: goto out;
1867: }
1868: ret = 0;
1.32 djm 1869: if (keyp != NULL) {
1870: *keyp = key;
1871: key = NULL;
1872: }
1.1 djm 1873: out:
1.14 djm 1874: sshbuf_free(copy);
1.1 djm 1875: sshkey_free(key);
1876: free(ktype);
1877: return ret;
1878: }
1879:
1880: int
1881: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
1882: {
1.14 djm 1883: struct sshbuf *b;
1884: int r;
1885:
1886: if ((b = sshbuf_from(blob, blen)) == NULL)
1887: return SSH_ERR_ALLOC_FAIL;
1888: r = sshkey_from_blob_internal(b, keyp, 1);
1889: sshbuf_free(b);
1890: return r;
1891: }
1892:
1893: int
1894: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
1895: {
1896: return sshkey_from_blob_internal(b, keyp, 1);
1897: }
1898:
1899: int
1900: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
1901: {
1902: struct sshbuf *b;
1903: int r;
1904:
1905: if ((r = sshbuf_froms(buf, &b)) != 0)
1906: return r;
1907: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 1908: sshbuf_free(b);
1909: return r;
1910: }
1911:
1.82 djm 1912: int
1913: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 1914: {
1915: int r;
1916: struct sshbuf *b = NULL;
1917: char *sigtype = NULL;
1918:
1919: if (sigtypep != NULL)
1920: *sigtypep = NULL;
1921: if ((b = sshbuf_from(sig, siglen)) == NULL)
1922: return SSH_ERR_ALLOC_FAIL;
1923: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
1924: goto out;
1925: /* success */
1926: if (sigtypep != NULL) {
1927: *sigtypep = sigtype;
1928: sigtype = NULL;
1929: }
1930: r = 0;
1931: out:
1932: free(sigtype);
1.14 djm 1933: sshbuf_free(b);
1934: return r;
1.68 djm 1935: }
1936:
1937: /*
1938: *
1939: * Checks whether a certificate's signature type is allowed.
1940: * Returns 0 (success) if the certificate signature type appears in the
1941: * "allowed" pattern-list, or the key is not a certificate to begin with.
1942: * Otherwise returns a ssherr.h code.
1943: */
1944: int
1945: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
1946: {
1947: if (key == NULL || allowed == NULL)
1948: return SSH_ERR_INVALID_ARGUMENT;
1949: if (!sshkey_type_is_cert(key->type))
1950: return 0;
1951: if (key->cert == NULL || key->cert->signature_type == NULL)
1952: return SSH_ERR_INVALID_ARGUMENT;
1953: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
1954: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
1955: return 0;
1.65 djm 1956: }
1957:
1958: /*
1959: * Returns the expected signature algorithm for a given public key algorithm.
1960: */
1.66 djm 1961: const char *
1962: sshkey_sigalg_by_name(const char *name)
1.65 djm 1963: {
1.123 djm 1964: const struct sshkey_impl *impl;
1965: int i;
1.65 djm 1966:
1.123 djm 1967: for (i = 0; keyimpls[i] != NULL; i++) {
1968: impl = keyimpls[i];
1969: if (strcmp(impl->name, name) != 0)
1.65 djm 1970: continue;
1.123 djm 1971: if (impl->sigalg != NULL)
1972: return impl->sigalg;
1973: if (!impl->cert)
1974: return impl->name;
1.65 djm 1975: return sshkey_ssh_name_from_type_nid(
1.123 djm 1976: sshkey_type_plain(impl->type), impl->nid);
1.65 djm 1977: }
1978: return NULL;
1979: }
1980:
1981: /*
1982: * Verifies that the signature algorithm appearing inside the signature blob
1983: * matches that which was requested.
1984: */
1985: int
1986: sshkey_check_sigtype(const u_char *sig, size_t siglen,
1987: const char *requested_alg)
1988: {
1989: const char *expected_alg;
1990: char *sigtype = NULL;
1991: int r;
1992:
1993: if (requested_alg == NULL)
1994: return 0;
1.66 djm 1995: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 1996: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 1997: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 1998: return r;
1999: r = strcmp(expected_alg, sigtype) == 0;
2000: free(sigtype);
2001: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2002: }
2003:
2004: int
1.76 djm 2005: sshkey_sign(struct sshkey *key,
1.1 djm 2006: u_char **sigp, size_t *lenp,
1.86 djm 2007: const u_char *data, size_t datalen,
1.111 djm 2008: const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
1.1 djm 2009: {
1.76 djm 2010: int was_shielded = sshkey_is_shielded(key);
2011: int r2, r = SSH_ERR_INTERNAL_ERROR;
1.130 ! djm 2012: const struct sshkey_impl *impl;
1.76 djm 2013:
1.1 djm 2014: if (sigp != NULL)
2015: *sigp = NULL;
2016: if (lenp != NULL)
2017: *lenp = 0;
2018: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2019: return SSH_ERR_INVALID_ARGUMENT;
1.130 ! djm 2020: if ((impl = sshkey_impl_from_key(key)) == NULL)
! 2021: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.76 djm 2022: if ((r = sshkey_unshield_private(key)) != 0)
2023: return r;
1.130 ! djm 2024: if (sshkey_is_sk(key)) {
1.97 djm 2025: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.111 djm 2026: datalen, compat, sk_pin);
1.130 ! djm 2027: } else {
! 2028: if (impl->funcs->sign == NULL)
! 2029: r = SSH_ERR_SIGN_ALG_UNSUPPORTED;
! 2030: else {
! 2031: r = impl->funcs->sign(key, sigp, lenp, data, datalen,
! 2032: alg, sk_provider, sk_pin, compat);
! 2033: }
1.1 djm 2034: }
1.76 djm 2035: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2036: return r2;
2037: return r;
1.1 djm 2038: }
2039:
2040: /*
2041: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2042: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2043: */
2044: int
2045: sshkey_verify(const struct sshkey *key,
2046: const u_char *sig, size_t siglen,
1.96 djm 2047: const u_char *data, size_t dlen, const char *alg, u_int compat,
2048: struct sshkey_sig_details **detailsp)
1.1 djm 2049: {
1.130 ! djm 2050: const struct sshkey_impl *impl;
! 2051:
1.96 djm 2052: if (detailsp != NULL)
2053: *detailsp = NULL;
1.6 djm 2054: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2055: return SSH_ERR_INVALID_ARGUMENT;
1.130 ! djm 2056: if ((impl = sshkey_impl_from_key(key)) == NULL)
1.1 djm 2057: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.130 ! djm 2058: return impl->funcs->verify(key, sig, siglen, data, dlen,
! 2059: alg, compat, detailsp);
1.1 djm 2060: }
2061:
2062: /* Convert a plain key to their _CERT equivalent */
2063: int
1.20 djm 2064: sshkey_to_certified(struct sshkey *k)
1.1 djm 2065: {
2066: int newtype;
2067:
2068: switch (k->type) {
2069: #ifdef WITH_OPENSSL
2070: case KEY_RSA:
1.20 djm 2071: newtype = KEY_RSA_CERT;
1.1 djm 2072: break;
2073: case KEY_DSA:
1.20 djm 2074: newtype = KEY_DSA_CERT;
1.1 djm 2075: break;
2076: case KEY_ECDSA:
2077: newtype = KEY_ECDSA_CERT;
2078: break;
1.85 djm 2079: case KEY_ECDSA_SK:
2080: newtype = KEY_ECDSA_SK_CERT;
2081: break;
1.1 djm 2082: #endif /* WITH_OPENSSL */
1.90 markus 2083: case KEY_ED25519_SK:
2084: newtype = KEY_ED25519_SK_CERT;
2085: break;
1.1 djm 2086: case KEY_ED25519:
2087: newtype = KEY_ED25519_CERT;
2088: break;
1.62 markus 2089: #ifdef WITH_XMSS
2090: case KEY_XMSS:
2091: newtype = KEY_XMSS_CERT;
2092: break;
2093: #endif /* WITH_XMSS */
1.1 djm 2094: default:
2095: return SSH_ERR_INVALID_ARGUMENT;
2096: }
2097: if ((k->cert = cert_new()) == NULL)
2098: return SSH_ERR_ALLOC_FAIL;
2099: k->type = newtype;
2100: return 0;
2101: }
2102:
2103: /* Convert a certificate to its raw key equivalent */
2104: int
2105: sshkey_drop_cert(struct sshkey *k)
2106: {
2107: if (!sshkey_type_is_cert(k->type))
2108: return SSH_ERR_KEY_TYPE_UNKNOWN;
2109: cert_free(k->cert);
2110: k->cert = NULL;
2111: k->type = sshkey_type_plain(k->type);
2112: return 0;
2113: }
2114:
2115: /* Sign a certified key, (re-)generating the signed certblob. */
2116: int
1.53 djm 2117: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2118: const char *sk_provider, const char *sk_pin,
2119: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2120: {
2121: struct sshbuf *principals = NULL;
2122: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2123: size_t i, ca_len, sig_len;
2124: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2125: struct sshbuf *cert = NULL;
2126: char *sigtype = NULL;
1.69 djm 2127: #ifdef WITH_OPENSSL
2128: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2129: #endif /* WITH_OPENSSL */
1.1 djm 2130:
2131: if (k == NULL || k->cert == NULL ||
2132: k->cert->certblob == NULL || ca == NULL)
2133: return SSH_ERR_INVALID_ARGUMENT;
2134: if (!sshkey_is_cert(k))
2135: return SSH_ERR_KEY_TYPE_UNKNOWN;
2136: if (!sshkey_type_is_valid_ca(ca->type))
2137: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2138:
1.67 djm 2139: /*
2140: * If no alg specified as argument but a signature_type was set,
2141: * then prefer that. If both were specified, then they must match.
2142: */
2143: if (alg == NULL)
2144: alg = k->cert->signature_type;
2145: else if (k->cert->signature_type != NULL &&
2146: strcmp(alg, k->cert->signature_type) != 0)
2147: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2148:
2149: /*
2150: * If no signing algorithm or signature_type was specified and we're
2151: * using a RSA key, then default to a good signature algorithm.
2152: */
2153: if (alg == NULL && ca->type == KEY_RSA)
2154: alg = "rsa-sha2-512";
1.67 djm 2155:
1.1 djm 2156: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2157: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2158:
2159: cert = k->cert->certblob; /* for readability */
2160: sshbuf_reset(cert);
2161: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2162: goto out;
2163:
2164: /* -v01 certs put nonce first */
2165: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2166: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2167: goto out;
1.1 djm 2168:
2169: /* XXX this substantially duplicates to_blob(); refactor */
2170: switch (k->type) {
2171: #ifdef WITH_OPENSSL
2172: case KEY_DSA_CERT:
1.69 djm 2173: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2174: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2175: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2176: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2177: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2178: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2179: goto out;
2180: break;
2181: case KEY_ECDSA_CERT:
1.85 djm 2182: case KEY_ECDSA_SK_CERT:
1.1 djm 2183: if ((ret = sshbuf_put_cstring(cert,
2184: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2185: (ret = sshbuf_put_ec(cert,
2186: EC_KEY_get0_public_key(k->ecdsa),
2187: EC_KEY_get0_group(k->ecdsa))) != 0)
2188: goto out;
1.85 djm 2189: if (k->type == KEY_ECDSA_SK_CERT) {
2190: if ((ret = sshbuf_put_cstring(cert,
2191: k->sk_application)) != 0)
2192: goto out;
2193: }
1.1 djm 2194: break;
2195: case KEY_RSA_CERT:
1.69 djm 2196: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2197: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2198: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2199: goto out;
2200: break;
2201: #endif /* WITH_OPENSSL */
2202: case KEY_ED25519_CERT:
1.94 djm 2203: case KEY_ED25519_SK_CERT:
1.1 djm 2204: if ((ret = sshbuf_put_string(cert,
2205: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2206: goto out;
1.94 djm 2207: if (k->type == KEY_ED25519_SK_CERT) {
2208: if ((ret = sshbuf_put_cstring(cert,
2209: k->sk_application)) != 0)
2210: goto out;
2211: }
1.1 djm 2212: break;
1.62 markus 2213: #ifdef WITH_XMSS
2214: case KEY_XMSS_CERT:
2215: if (k->xmss_name == NULL) {
2216: ret = SSH_ERR_INVALID_ARGUMENT;
2217: goto out;
2218: }
2219: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2220: (ret = sshbuf_put_string(cert,
2221: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2222: goto out;
2223: break;
2224: #endif /* WITH_XMSS */
1.1 djm 2225: default:
2226: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2227: goto out;
1.1 djm 2228: }
2229:
1.20 djm 2230: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2231: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2232: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2233: goto out;
2234:
2235: if ((principals = sshbuf_new()) == NULL) {
2236: ret = SSH_ERR_ALLOC_FAIL;
2237: goto out;
2238: }
2239: for (i = 0; i < k->cert->nprincipals; i++) {
2240: if ((ret = sshbuf_put_cstring(principals,
2241: k->cert->principals[i])) != 0)
2242: goto out;
2243: }
2244: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2245: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2246: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2247: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2248: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2249: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2250: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2251: goto out;
2252:
2253: /* Sign the whole mess */
1.53 djm 2254: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.111 djm 2255: sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
1.1 djm 2256: goto out;
1.67 djm 2257: /* Check and update signature_type against what was actually used */
1.82 djm 2258: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2259: goto out;
2260: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2261: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2262: goto out;
2263: }
2264: if (k->cert->signature_type == NULL) {
2265: k->cert->signature_type = sigtype;
2266: sigtype = NULL;
2267: }
1.1 djm 2268: /* Append signature and we are done */
2269: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2270: goto out;
2271: ret = 0;
2272: out:
2273: if (ret != 0)
2274: sshbuf_reset(cert);
1.29 mmcc 2275: free(sig_blob);
2276: free(ca_blob);
1.67 djm 2277: free(sigtype);
1.31 mmcc 2278: sshbuf_free(principals);
1.1 djm 2279: return ret;
1.53 djm 2280: }
2281:
2282: static int
1.76 djm 2283: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2284: const u_char *data, size_t datalen,
1.111 djm 2285: const char *alg, const char *sk_provider, const char *sk_pin,
2286: u_int compat, void *ctx)
1.53 djm 2287: {
2288: if (ctx != NULL)
2289: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2290: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
1.111 djm 2291: sk_provider, sk_pin, compat);
1.53 djm 2292: }
2293:
2294: int
1.86 djm 2295: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2296: const char *sk_provider, const char *sk_pin)
1.53 djm 2297: {
1.111 djm 2298: return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
1.86 djm 2299: default_key_sign, NULL);
1.1 djm 2300: }
2301:
2302: int
2303: sshkey_cert_check_authority(const struct sshkey *k,
1.114 djm 2304: int want_host, int require_principal, int wildcard_pattern,
1.119 djm 2305: uint64_t verify_time, const char *name, const char **reason)
1.1 djm 2306: {
2307: u_int i, principal_matches;
2308:
1.102 markus 2309: if (reason == NULL)
2310: return SSH_ERR_INVALID_ARGUMENT;
1.114 djm 2311: if (!sshkey_is_cert(k)) {
2312: *reason = "Key is not a certificate";
2313: return SSH_ERR_KEY_CERT_INVALID;
2314: }
1.1 djm 2315: if (want_host) {
2316: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2317: *reason = "Certificate invalid: not a host certificate";
2318: return SSH_ERR_KEY_CERT_INVALID;
2319: }
2320: } else {
2321: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2322: *reason = "Certificate invalid: not a user certificate";
2323: return SSH_ERR_KEY_CERT_INVALID;
2324: }
2325: }
1.119 djm 2326: if (verify_time < k->cert->valid_after) {
1.1 djm 2327: *reason = "Certificate invalid: not yet valid";
2328: return SSH_ERR_KEY_CERT_INVALID;
2329: }
1.119 djm 2330: if (verify_time >= k->cert->valid_before) {
1.1 djm 2331: *reason = "Certificate invalid: expired";
2332: return SSH_ERR_KEY_CERT_INVALID;
2333: }
2334: if (k->cert->nprincipals == 0) {
2335: if (require_principal) {
2336: *reason = "Certificate lacks principal list";
2337: return SSH_ERR_KEY_CERT_INVALID;
2338: }
2339: } else if (name != NULL) {
2340: principal_matches = 0;
2341: for (i = 0; i < k->cert->nprincipals; i++) {
1.114 djm 2342: if (wildcard_pattern) {
2343: if (match_pattern(k->cert->principals[i],
2344: name)) {
2345: principal_matches = 1;
2346: break;
2347: }
2348: } else if (strcmp(name, k->cert->principals[i]) == 0) {
1.1 djm 2349: principal_matches = 1;
2350: break;
2351: }
2352: }
2353: if (!principal_matches) {
2354: *reason = "Certificate invalid: name is not a listed "
2355: "principal";
2356: return SSH_ERR_KEY_CERT_INVALID;
2357: }
1.114 djm 2358: }
2359: return 0;
2360: }
2361:
2362: int
1.119 djm 2363: sshkey_cert_check_authority_now(const struct sshkey *k,
2364: int want_host, int require_principal, int wildcard_pattern,
2365: const char *name, const char **reason)
2366: {
2367: time_t now;
2368:
2369: if ((now = time(NULL)) < 0) {
2370: /* yikes - system clock before epoch! */
2371: *reason = "Certificate invalid: not yet valid";
2372: return SSH_ERR_KEY_CERT_INVALID;
2373: }
2374: return sshkey_cert_check_authority(k, want_host, require_principal,
2375: wildcard_pattern, (uint64_t)now, name, reason);
2376: }
2377:
2378: int
1.114 djm 2379: sshkey_cert_check_host(const struct sshkey *key, const char *host,
2380: int wildcard_principals, const char *ca_sign_algorithms,
2381: const char **reason)
2382: {
2383: int r;
2384:
1.119 djm 2385: if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
1.114 djm 2386: host, reason)) != 0)
2387: return r;
2388: if (sshbuf_len(key->cert->critical) != 0) {
2389: *reason = "Certificate contains unsupported critical options";
2390: return SSH_ERR_KEY_CERT_INVALID;
2391: }
2392: if (ca_sign_algorithms != NULL &&
2393: (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2394: *reason = "Certificate signed with disallowed algorithm";
2395: return SSH_ERR_KEY_CERT_INVALID;
1.1 djm 2396: }
2397: return 0;
1.27 djm 2398: }
2399:
2400: size_t
2401: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2402: {
1.113 dtucker 2403: char from[32], to[32], ret[128];
1.27 djm 2404:
2405: *from = *to = '\0';
2406: if (cert->valid_after == 0 &&
2407: cert->valid_before == 0xffffffffffffffffULL)
2408: return strlcpy(s, "forever", l);
2409:
1.118 dtucker 2410: if (cert->valid_after != 0)
2411: format_absolute_time(cert->valid_after, from, sizeof(from));
2412: if (cert->valid_before != 0xffffffffffffffffULL)
2413: format_absolute_time(cert->valid_before, to, sizeof(to));
1.27 djm 2414:
2415: if (cert->valid_after == 0)
2416: snprintf(ret, sizeof(ret), "before %s", to);
2417: else if (cert->valid_before == 0xffffffffffffffffULL)
2418: snprintf(ret, sizeof(ret), "after %s", from);
2419: else
2420: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2421:
2422: return strlcpy(s, ret, l);
1.1 djm 2423: }
2424:
2425: int
1.76 djm 2426: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2427: enum sshkey_serialize_rep opts)
1.1 djm 2428: {
2429: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2430: int was_shielded = sshkey_is_shielded(key);
2431: struct sshbuf *b = NULL;
1.69 djm 2432: #ifdef WITH_OPENSSL
2433: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2434: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2435: #endif /* WITH_OPENSSL */
1.1 djm 2436:
1.76 djm 2437: if ((r = sshkey_unshield_private(key)) != 0)
2438: return r;
2439: if ((b = sshbuf_new()) == NULL)
2440: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2441: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2442: goto out;
2443: switch (key->type) {
2444: #ifdef WITH_OPENSSL
2445: case KEY_RSA:
1.69 djm 2446: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2447: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2448: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2449: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2450: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2451: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2452: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2453: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2454: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2455: goto out;
2456: break;
2457: case KEY_RSA_CERT:
2458: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2459: r = SSH_ERR_INVALID_ARGUMENT;
2460: goto out;
2461: }
1.69 djm 2462: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2463: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2464: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2465: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2466: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2467: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2468: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2469: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2470: goto out;
2471: break;
2472: case KEY_DSA:
1.69 djm 2473: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2474: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2475: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2476: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2477: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2478: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2479: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2480: goto out;
2481: break;
2482: case KEY_DSA_CERT:
2483: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2484: r = SSH_ERR_INVALID_ARGUMENT;
2485: goto out;
2486: }
1.69 djm 2487: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2488: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2489: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2490: goto out;
2491: break;
2492: case KEY_ECDSA:
2493: if ((r = sshbuf_put_cstring(b,
2494: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2495: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2496: (r = sshbuf_put_bignum2(b,
2497: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2498: goto out;
2499: break;
2500: case KEY_ECDSA_CERT:
2501: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2502: r = SSH_ERR_INVALID_ARGUMENT;
2503: goto out;
2504: }
2505: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2506: (r = sshbuf_put_bignum2(b,
2507: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2508: goto out;
2509: break;
1.85 djm 2510: case KEY_ECDSA_SK:
2511: if ((r = sshbuf_put_cstring(b,
2512: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2513: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2514: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2515: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2516: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2517: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2518: goto out;
2519: break;
2520: case KEY_ECDSA_SK_CERT:
2521: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2522: r = SSH_ERR_INVALID_ARGUMENT;
2523: goto out;
2524: }
2525: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2526: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2527: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2528: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2529: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2530: goto out;
2531: break;
1.1 djm 2532: #endif /* WITH_OPENSSL */
2533: case KEY_ED25519:
2534: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2535: ED25519_PK_SZ)) != 0 ||
2536: (r = sshbuf_put_string(b, key->ed25519_sk,
2537: ED25519_SK_SZ)) != 0)
2538: goto out;
2539: break;
2540: case KEY_ED25519_CERT:
2541: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2542: r = SSH_ERR_INVALID_ARGUMENT;
2543: goto out;
2544: }
2545: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2546: (r = sshbuf_put_string(b, key->ed25519_pk,
2547: ED25519_PK_SZ)) != 0 ||
2548: (r = sshbuf_put_string(b, key->ed25519_sk,
2549: ED25519_SK_SZ)) != 0)
2550: goto out;
2551: break;
1.90 markus 2552: case KEY_ED25519_SK:
2553: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2554: ED25519_PK_SZ)) != 0 ||
2555: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2556: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2557: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2558: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2559: goto out;
2560: break;
2561: case KEY_ED25519_SK_CERT:
2562: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2563: r = SSH_ERR_INVALID_ARGUMENT;
2564: goto out;
2565: }
2566: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2567: (r = sshbuf_put_string(b, key->ed25519_pk,
2568: ED25519_PK_SZ)) != 0 ||
2569: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2570: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2571: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2572: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2573: goto out;
2574: break;
1.62 markus 2575: #ifdef WITH_XMSS
2576: case KEY_XMSS:
2577: if (key->xmss_name == NULL) {
2578: r = SSH_ERR_INVALID_ARGUMENT;
2579: goto out;
2580: }
2581: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2582: (r = sshbuf_put_string(b, key->xmss_pk,
2583: sshkey_xmss_pklen(key))) != 0 ||
2584: (r = sshbuf_put_string(b, key->xmss_sk,
2585: sshkey_xmss_sklen(key))) != 0 ||
2586: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2587: goto out;
2588: break;
2589: case KEY_XMSS_CERT:
2590: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2591: key->xmss_name == NULL) {
2592: r = SSH_ERR_INVALID_ARGUMENT;
2593: goto out;
2594: }
2595: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2596: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2597: (r = sshbuf_put_string(b, key->xmss_pk,
2598: sshkey_xmss_pklen(key))) != 0 ||
2599: (r = sshbuf_put_string(b, key->xmss_sk,
2600: sshkey_xmss_sklen(key))) != 0 ||
2601: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2602: goto out;
2603: break;
2604: #endif /* WITH_XMSS */
1.1 djm 2605: default:
2606: r = SSH_ERR_INVALID_ARGUMENT;
2607: goto out;
2608: }
1.76 djm 2609: /*
2610: * success (but we still need to append the output to buf after
2611: * possibly re-shielding the private key)
2612: */
1.1 djm 2613: r = 0;
2614: out:
1.76 djm 2615: if (was_shielded)
2616: r = sshkey_shield_private(key);
2617: if (r == 0)
2618: r = sshbuf_putb(buf, b);
2619: sshbuf_free(b);
2620:
1.1 djm 2621: return r;
2622: }
2623:
2624: int
1.76 djm 2625: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 2626: {
2627: return sshkey_private_serialize_opt(key, b,
2628: SSHKEY_SERIALIZE_DEFAULT);
2629: }
2630:
2631: int
1.1 djm 2632: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2633: {
1.62 markus 2634: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.115 djm 2635: char *expect_sk_application = NULL;
1.1 djm 2636: struct sshkey *k = NULL;
1.14 djm 2637: size_t pklen = 0, sklen = 0;
1.1 djm 2638: int type, r = SSH_ERR_INTERNAL_ERROR;
2639: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.115 djm 2640: u_char *expect_ed25519_pk = NULL;
1.62 markus 2641: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2642: #ifdef WITH_OPENSSL
2643: BIGNUM *exponent = NULL;
1.69 djm 2644: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2645: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2646: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2647: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2648: #endif /* WITH_OPENSSL */
2649:
2650: if (kp != NULL)
2651: *kp = NULL;
2652: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2653: goto out;
2654: type = sshkey_type_from_name(tname);
1.108 djm 2655: if (sshkey_type_is_cert(type)) {
2656: /*
2657: * Certificate key private keys begin with the certificate
2658: * itself. Make sure this matches the type of the enclosing
2659: * private key.
2660: */
2661: if ((r = sshkey_froms(buf, &k)) != 0)
2662: goto out;
2663: if (k->type != type) {
2664: r = SSH_ERR_KEY_CERT_MISMATCH;
2665: goto out;
2666: }
2667: /* For ECDSA keys, the group must match too */
2668: if (k->type == KEY_ECDSA &&
2669: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2670: r = SSH_ERR_KEY_CERT_MISMATCH;
2671: goto out;
2672: }
1.115 djm 2673: /*
2674: * Several fields are redundant between certificate and
2675: * private key body, we require these to match.
2676: */
2677: expect_sk_application = k->sk_application;
2678: expect_ed25519_pk = k->ed25519_pk;
2679: k->sk_application = NULL;
2680: k->ed25519_pk = NULL;
1.108 djm 2681: } else {
1.70 djm 2682: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2683: r = SSH_ERR_ALLOC_FAIL;
2684: goto out;
2685: }
1.108 djm 2686: }
2687: switch (type) {
2688: #ifdef WITH_OPENSSL
2689: case KEY_DSA:
1.73 djm 2690: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
2691: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
2692: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
1.108 djm 2693: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0)
1.69 djm 2694: goto out;
2695: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2696: r = SSH_ERR_LIBCRYPTO_ERROR;
2697: goto out;
2698: }
2699: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
1.108 djm 2700: if (!DSA_set0_key(k->dsa, dsa_pub_key, NULL)) {
1.69 djm 2701: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2702: goto out;
1.69 djm 2703: }
1.108 djm 2704: dsa_pub_key = NULL; /* transferred */
2705: /* FALLTHROUGH */
1.1 djm 2706: case KEY_DSA_CERT:
1.108 djm 2707: if ((r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.84 djm 2708: goto out;
1.69 djm 2709: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2710: r = SSH_ERR_LIBCRYPTO_ERROR;
2711: goto out;
2712: }
2713: dsa_priv_key = NULL; /* transferred */
1.1 djm 2714: break;
2715: case KEY_ECDSA:
2716: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2717: r = SSH_ERR_INVALID_ARGUMENT;
2718: goto out;
2719: }
2720: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2721: goto out;
2722: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2723: r = SSH_ERR_EC_CURVE_MISMATCH;
2724: goto out;
2725: }
2726: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 2727: if (k->ecdsa == NULL) {
1.1 djm 2728: r = SSH_ERR_LIBCRYPTO_ERROR;
2729: goto out;
2730: }
1.108 djm 2731: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0)
1.1 djm 2732: goto out;
1.108 djm 2733: /* FALLTHROUGH */
1.1 djm 2734: case KEY_ECDSA_CERT:
1.108 djm 2735: if ((r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 2736: goto out;
2737: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2738: r = SSH_ERR_LIBCRYPTO_ERROR;
2739: goto out;
2740: }
2741: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2742: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2743: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2744: goto out;
2745: break;
1.85 djm 2746: case KEY_ECDSA_SK:
2747: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2748: r = SSH_ERR_INVALID_ARGUMENT;
2749: goto out;
2750: }
2751: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2752: goto out;
2753: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2754: r = SSH_ERR_EC_CURVE_MISMATCH;
2755: goto out;
2756: }
2757: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2758: (k->sk_reserved = sshbuf_new()) == NULL) {
2759: r = SSH_ERR_ALLOC_FAIL;
2760: goto out;
2761: }
2762: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2763: if (k->ecdsa == NULL) {
2764: r = SSH_ERR_LIBCRYPTO_ERROR;
2765: goto out;
2766: }
2767: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2768: (r = sshbuf_get_cstring(buf, &k->sk_application,
2769: NULL)) != 0 ||
2770: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2771: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2772: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2773: goto out;
2774: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2775: EC_KEY_get0_public_key(k->ecdsa))) != 0)
2776: goto out;
2777: break;
2778: case KEY_ECDSA_SK_CERT:
2779: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2780: (k->sk_reserved = sshbuf_new()) == NULL) {
2781: r = SSH_ERR_ALLOC_FAIL;
2782: goto out;
2783: }
2784: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
2785: NULL)) != 0 ||
2786: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2787: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2788: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2789: goto out;
2790: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2791: EC_KEY_get0_public_key(k->ecdsa))) != 0)
2792: goto out;
2793: break;
1.1 djm 2794: case KEY_RSA:
1.73 djm 2795: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
1.108 djm 2796: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0)
1.1 djm 2797: goto out;
1.108 djm 2798: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, NULL)) {
1.69 djm 2799: r = SSH_ERR_LIBCRYPTO_ERROR;
2800: goto out;
2801: }
1.108 djm 2802: rsa_n = rsa_e = NULL; /* transferred */
2803: /* FALLTHROUGH */
1.1 djm 2804: case KEY_RSA_CERT:
1.108 djm 2805: if ((r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
1.73 djm 2806: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
2807: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
2808: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 2809: goto out;
1.69 djm 2810: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
2811: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2812: goto out;
2813: }
1.69 djm 2814: rsa_d = NULL; /* transferred */
2815: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
2816: r = SSH_ERR_LIBCRYPTO_ERROR;
2817: goto out;
2818: }
2819: rsa_p = rsa_q = NULL; /* transferred */
1.122 djm 2820: if ((r = sshkey_check_rsa_length(k, 0)) != 0)
1.69 djm 2821: goto out;
2822: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
2823: goto out;
1.1 djm 2824: break;
2825: #endif /* WITH_OPENSSL */
2826: case KEY_ED25519:
1.108 djm 2827: case KEY_ED25519_CERT:
1.1 djm 2828: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2829: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2830: goto out;
2831: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2832: r = SSH_ERR_INVALID_FORMAT;
2833: goto out;
2834: }
2835: k->ed25519_pk = ed25519_pk;
2836: k->ed25519_sk = ed25519_sk;
1.84 djm 2837: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 2838: break;
1.90 markus 2839: case KEY_ED25519_SK:
1.108 djm 2840: case KEY_ED25519_SK_CERT:
1.90 markus 2841: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
2842: goto out;
2843: if (pklen != ED25519_PK_SZ) {
2844: r = SSH_ERR_INVALID_FORMAT;
2845: goto out;
2846: }
2847: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2848: (k->sk_reserved = sshbuf_new()) == NULL) {
2849: r = SSH_ERR_ALLOC_FAIL;
2850: goto out;
2851: }
2852: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
2853: NULL)) != 0 ||
2854: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2855: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2856: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2857: goto out;
2858: k->ed25519_pk = ed25519_pk;
2859: ed25519_pk = NULL; /* transferred */
2860: break;
1.62 markus 2861: #ifdef WITH_XMSS
2862: case KEY_XMSS:
1.108 djm 2863: case KEY_XMSS_CERT:
1.62 markus 2864: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
2865: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
2866: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
1.110 markus 2867: goto out;
2868: if (type == KEY_XMSS &&
2869: (r = sshkey_xmss_init(k, xmss_name)) != 0)
1.62 markus 2870: goto out;
2871: if (pklen != sshkey_xmss_pklen(k) ||
2872: sklen != sshkey_xmss_sklen(k)) {
2873: r = SSH_ERR_INVALID_FORMAT;
2874: goto out;
2875: }
2876: k->xmss_pk = xmss_pk;
2877: k->xmss_sk = xmss_sk;
2878: xmss_pk = xmss_sk = NULL;
2879: /* optional internal state */
2880: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
2881: goto out;
2882: break;
2883: #endif /* WITH_XMSS */
1.1 djm 2884: default:
2885: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2886: goto out;
2887: }
2888: #ifdef WITH_OPENSSL
2889: /* enable blinding */
2890: switch (k->type) {
2891: case KEY_RSA:
2892: case KEY_RSA_CERT:
2893: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2894: r = SSH_ERR_LIBCRYPTO_ERROR;
2895: goto out;
2896: }
2897: break;
2898: }
2899: #endif /* WITH_OPENSSL */
1.115 djm 2900: if ((expect_sk_application != NULL && (k->sk_application == NULL ||
2901: strcmp(expect_sk_application, k->sk_application) != 0)) ||
2902: (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
1.116 djm 2903: memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
1.115 djm 2904: r = SSH_ERR_KEY_CERT_MISMATCH;
2905: goto out;
2906: }
1.1 djm 2907: /* success */
2908: r = 0;
2909: if (kp != NULL) {
2910: *kp = k;
2911: k = NULL;
2912: }
2913: out:
2914: free(tname);
2915: free(curve);
2916: #ifdef WITH_OPENSSL
1.60 jsing 2917: BN_clear_free(exponent);
1.69 djm 2918: BN_clear_free(dsa_p);
2919: BN_clear_free(dsa_q);
2920: BN_clear_free(dsa_g);
2921: BN_clear_free(dsa_pub_key);
2922: BN_clear_free(dsa_priv_key);
2923: BN_clear_free(rsa_n);
2924: BN_clear_free(rsa_e);
2925: BN_clear_free(rsa_d);
2926: BN_clear_free(rsa_p);
2927: BN_clear_free(rsa_q);
2928: BN_clear_free(rsa_iqmp);
1.1 djm 2929: #endif /* WITH_OPENSSL */
2930: sshkey_free(k);
1.61 jsing 2931: freezero(ed25519_pk, pklen);
2932: freezero(ed25519_sk, sklen);
1.62 markus 2933: free(xmss_name);
2934: freezero(xmss_pk, pklen);
2935: freezero(xmss_sk, sklen);
1.115 djm 2936: free(expect_sk_application);
2937: free(expect_ed25519_pk);
1.1 djm 2938: return r;
2939: }
2940:
2941: #ifdef WITH_OPENSSL
2942: int
2943: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2944: {
2945: EC_POINT *nq = NULL;
1.93 djm 2946: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 2947: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2948:
2949: /*
2950: * NB. This assumes OpenSSL has already verified that the public
2951: * point lies on the curve. This is done by EC_POINT_oct2point()
2952: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2953: * reachable with public points not unmarshalled using
2954: * EC_POINT_oct2point then the caller will need to explicitly check.
2955: */
1.1 djm 2956:
2957: /*
2958: * We shouldn't ever hit this case because bignum_get_ecpoint()
2959: * refuses to load GF2m points.
2960: */
2961: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2962: NID_X9_62_prime_field)
2963: goto out;
2964:
2965: /* Q != infinity */
2966: if (EC_POINT_is_at_infinity(group, public))
2967: goto out;
2968:
1.93 djm 2969: if ((x = BN_new()) == NULL ||
2970: (y = BN_new()) == NULL ||
2971: (order = BN_new()) == NULL ||
2972: (tmp = BN_new()) == NULL) {
1.1 djm 2973: ret = SSH_ERR_ALLOC_FAIL;
2974: goto out;
2975: }
2976:
2977: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 2978: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 2979: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 2980: x, y, NULL) != 1) {
1.1 djm 2981: ret = SSH_ERR_LIBCRYPTO_ERROR;
2982: goto out;
2983: }
2984: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2985: BN_num_bits(y) <= BN_num_bits(order) / 2)
2986: goto out;
2987:
2988: /* nQ == infinity (n == order of subgroup) */
2989: if ((nq = EC_POINT_new(group)) == NULL) {
2990: ret = SSH_ERR_ALLOC_FAIL;
2991: goto out;
2992: }
1.93 djm 2993: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 2994: ret = SSH_ERR_LIBCRYPTO_ERROR;
2995: goto out;
2996: }
2997: if (EC_POINT_is_at_infinity(group, nq) != 1)
2998: goto out;
2999:
3000: /* x < order - 1, y < order - 1 */
3001: if (!BN_sub(tmp, order, BN_value_one())) {
3002: ret = SSH_ERR_LIBCRYPTO_ERROR;
3003: goto out;
3004: }
3005: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3006: goto out;
3007: ret = 0;
3008: out:
1.93 djm 3009: BN_clear_free(x);
3010: BN_clear_free(y);
3011: BN_clear_free(order);
3012: BN_clear_free(tmp);
1.60 jsing 3013: EC_POINT_free(nq);
1.1 djm 3014: return ret;
3015: }
3016:
3017: int
3018: sshkey_ec_validate_private(const EC_KEY *key)
3019: {
1.93 djm 3020: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3021: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3022:
1.93 djm 3023: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3024: ret = SSH_ERR_ALLOC_FAIL;
3025: goto out;
3026: }
3027:
3028: /* log2(private) > log2(order)/2 */
1.93 djm 3029: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3030: ret = SSH_ERR_LIBCRYPTO_ERROR;
3031: goto out;
3032: }
3033: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3034: BN_num_bits(order) / 2)
3035: goto out;
3036:
3037: /* private < order - 1 */
3038: if (!BN_sub(tmp, order, BN_value_one())) {
3039: ret = SSH_ERR_LIBCRYPTO_ERROR;
3040: goto out;
3041: }
3042: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3043: goto out;
3044: ret = 0;
3045: out:
1.93 djm 3046: BN_clear_free(order);
3047: BN_clear_free(tmp);
1.1 djm 3048: return ret;
3049: }
3050:
3051: void
3052: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3053: {
1.93 djm 3054: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3055:
3056: if (point == NULL) {
3057: fputs("point=(NULL)\n", stderr);
3058: return;
3059: }
1.93 djm 3060: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3061: fprintf(stderr, "%s: BN_new failed\n", __func__);
3062: goto out;
1.1 djm 3063: }
3064: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3065: NID_X9_62_prime_field) {
3066: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3067: goto out;
1.1 djm 3068: }
1.93 djm 3069: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3070: x, y, NULL) != 1) {
1.1 djm 3071: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3072: __func__);
1.93 djm 3073: goto out;
1.1 djm 3074: }
3075: fputs("x=", stderr);
3076: BN_print_fp(stderr, x);
3077: fputs("\ny=", stderr);
3078: BN_print_fp(stderr, y);
3079: fputs("\n", stderr);
1.93 djm 3080: out:
3081: BN_clear_free(x);
3082: BN_clear_free(y);
1.1 djm 3083: }
3084:
3085: void
3086: sshkey_dump_ec_key(const EC_KEY *key)
3087: {
3088: const BIGNUM *exponent;
3089:
3090: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3091: EC_KEY_get0_public_key(key));
3092: fputs("exponent=", stderr);
3093: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3094: fputs("(NULL)", stderr);
3095: else
3096: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3097: fputs("\n", stderr);
3098: }
3099: #endif /* WITH_OPENSSL */
3100:
3101: static int
1.76 djm 3102: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3103: const char *passphrase, const char *comment, const char *ciphername,
3104: int rounds)
3105: {
1.4 djm 3106: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3107: u_char salt[SALT_LEN];
1.4 djm 3108: char *b64 = NULL;
1.1 djm 3109: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3110: u_int check;
3111: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3112: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3113: const struct sshcipher *cipher;
3114: const char *kdfname = KDFNAME;
3115: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3116:
3117: if (rounds <= 0)
3118: rounds = DEFAULT_ROUNDS;
3119: if (passphrase == NULL || !strlen(passphrase)) {
3120: ciphername = "none";
3121: kdfname = "none";
3122: } else if (ciphername == NULL)
3123: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3124: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3125: r = SSH_ERR_INVALID_ARGUMENT;
3126: goto out;
3127: }
3128:
3129: if ((kdf = sshbuf_new()) == NULL ||
3130: (encoded = sshbuf_new()) == NULL ||
3131: (encrypted = sshbuf_new()) == NULL) {
3132: r = SSH_ERR_ALLOC_FAIL;
3133: goto out;
3134: }
3135: blocksize = cipher_blocksize(cipher);
3136: keylen = cipher_keylen(cipher);
3137: ivlen = cipher_ivlen(cipher);
3138: authlen = cipher_authlen(cipher);
3139: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3140: r = SSH_ERR_ALLOC_FAIL;
3141: goto out;
3142: }
3143: if (strcmp(kdfname, "bcrypt") == 0) {
3144: arc4random_buf(salt, SALT_LEN);
3145: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3146: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3147: r = SSH_ERR_INVALID_ARGUMENT;
3148: goto out;
3149: }
3150: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3151: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3152: goto out;
3153: } else if (strcmp(kdfname, "none") != 0) {
3154: /* Unsupported KDF type */
3155: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3156: goto out;
3157: }
3158: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3159: key + keylen, ivlen, 1)) != 0)
3160: goto out;
3161:
3162: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3163: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3164: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3165: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3166: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3167: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3168: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3169: goto out;
3170:
3171: /* set up the buffer that will be encrypted */
3172:
3173: /* Random check bytes */
3174: check = arc4random();
3175: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3176: (r = sshbuf_put_u32(encrypted, check)) != 0)
3177: goto out;
3178:
3179: /* append private key and comment*/
1.62 markus 3180: if ((r = sshkey_private_serialize_opt(prv, encrypted,
1.116 djm 3181: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3182: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3183: goto out;
3184:
3185: /* padding */
3186: i = 0;
3187: while (sshbuf_len(encrypted) % blocksize) {
3188: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3189: goto out;
3190: }
3191:
3192: /* length in destination buffer */
3193: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3194: goto out;
3195:
3196: /* encrypt */
3197: if ((r = sshbuf_reserve(encoded,
3198: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3199: goto out;
1.36 djm 3200: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3201: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3202: goto out;
3203:
1.81 djm 3204: sshbuf_reset(blob);
1.1 djm 3205:
1.81 djm 3206: /* assemble uuencoded key */
3207: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3208: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3209: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3210: goto out;
3211:
3212: /* success */
3213: r = 0;
3214:
3215: out:
3216: sshbuf_free(kdf);
3217: sshbuf_free(encoded);
3218: sshbuf_free(encrypted);
1.36 djm 3219: cipher_free(ciphercontext);
1.1 djm 3220: explicit_bzero(salt, sizeof(salt));
1.100 jsg 3221: if (key != NULL)
3222: freezero(key, keylen + ivlen);
1.121 djm 3223: if (pubkeyblob != NULL)
1.100 jsg 3224: freezero(pubkeyblob, pubkeylen);
1.121 djm 3225: if (b64 != NULL)
1.100 jsg 3226: freezero(b64, strlen(b64));
1.1 djm 3227: return r;
3228: }
3229:
3230: static int
1.103 djm 3231: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 3232: {
3233: const u_char *cp;
3234: size_t encoded_len;
1.103 djm 3235: int r;
3236: u_char last;
1.1 djm 3237: struct sshbuf *encoded = NULL, *decoded = NULL;
3238:
1.103 djm 3239: if (blob == NULL || decodedp == NULL)
3240: return SSH_ERR_INVALID_ARGUMENT;
3241:
3242: *decodedp = NULL;
1.1 djm 3243:
3244: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 3245: (decoded = sshbuf_new()) == NULL) {
1.1 djm 3246: r = SSH_ERR_ALLOC_FAIL;
3247: goto out;
3248: }
3249:
3250: /* check preamble */
3251: cp = sshbuf_ptr(blob);
3252: encoded_len = sshbuf_len(blob);
3253: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3254: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3255: r = SSH_ERR_INVALID_FORMAT;
3256: goto out;
3257: }
3258: cp += MARK_BEGIN_LEN;
3259: encoded_len -= MARK_BEGIN_LEN;
3260:
3261: /* Look for end marker, removing whitespace as we go */
3262: while (encoded_len > 0) {
3263: if (*cp != '\n' && *cp != '\r') {
3264: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3265: goto out;
3266: }
3267: last = *cp;
3268: encoded_len--;
3269: cp++;
3270: if (last == '\n') {
3271: if (encoded_len >= MARK_END_LEN &&
3272: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3273: /* \0 terminate */
3274: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3275: goto out;
3276: break;
3277: }
3278: }
3279: }
3280: if (encoded_len == 0) {
3281: r = SSH_ERR_INVALID_FORMAT;
3282: goto out;
3283: }
3284:
3285: /* decode base64 */
1.4 djm 3286: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3287: goto out;
3288:
3289: /* check magic */
3290: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3291: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3292: r = SSH_ERR_INVALID_FORMAT;
3293: goto out;
3294: }
1.103 djm 3295: /* success */
3296: *decodedp = decoded;
3297: decoded = NULL;
3298: r = 0;
3299: out:
3300: sshbuf_free(encoded);
3301: sshbuf_free(decoded);
3302: return r;
3303: }
3304:
3305: static int
1.104 djm 3306: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
3307: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 3308: {
3309: char *ciphername = NULL, *kdfname = NULL;
3310: const struct sshcipher *cipher = NULL;
3311: int r = SSH_ERR_INTERNAL_ERROR;
3312: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3313: struct sshbuf *kdf = NULL, *decrypted = NULL;
3314: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 3315: struct sshkey *pubkey = NULL;
1.103 djm 3316: u_char *key = NULL, *salt = NULL, *dp;
3317: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3318:
1.104 djm 3319: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 3320: return SSH_ERR_INVALID_ARGUMENT;
3321:
3322: *decryptedp = NULL;
1.104 djm 3323: *pubkeyp = NULL;
1.103 djm 3324:
3325: if ((decrypted = sshbuf_new()) == NULL) {
3326: r = SSH_ERR_ALLOC_FAIL;
3327: goto out;
3328: }
3329:
1.1 djm 3330: /* parse public portion of key */
3331: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3332: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3333: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3334: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 3335: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3336: goto out;
3337:
3338: if (nkeys != 1) {
3339: /* XXX only one key supported at present */
3340: r = SSH_ERR_INVALID_FORMAT;
3341: goto out;
3342: }
3343:
1.104 djm 3344: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 3345: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3346: goto out;
3347:
3348: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3349: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3350: goto out;
3351: }
3352: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3353: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3354: goto out;
3355: }
1.101 markus 3356: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 3357: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 3358: goto out;
3359: }
3360: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3361: strcmp(kdfname, "none") != 0) {
3362: /* passphrase required */
3363: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 3364: goto out;
3365: }
3366:
3367: /* check size of encrypted key blob */
3368: blocksize = cipher_blocksize(cipher);
3369: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3370: r = SSH_ERR_INVALID_FORMAT;
3371: goto out;
3372: }
3373:
3374: /* setup key */
3375: keylen = cipher_keylen(cipher);
3376: ivlen = cipher_ivlen(cipher);
1.18 djm 3377: authlen = cipher_authlen(cipher);
1.1 djm 3378: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3379: r = SSH_ERR_ALLOC_FAIL;
3380: goto out;
3381: }
3382: if (strcmp(kdfname, "bcrypt") == 0) {
3383: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3384: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3385: goto out;
3386: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3387: key, keylen + ivlen, rounds) < 0) {
3388: r = SSH_ERR_INVALID_FORMAT;
3389: goto out;
3390: }
3391: }
3392:
1.18 djm 3393: /* check that an appropriate amount of auth data is present */
1.84 djm 3394: if (sshbuf_len(decoded) < authlen ||
3395: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 3396: r = SSH_ERR_INVALID_FORMAT;
3397: goto out;
3398: }
3399:
1.1 djm 3400: /* decrypt private portion of key */
3401: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3402: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3403: key + keylen, ivlen, 0)) != 0)
3404: goto out;
1.36 djm 3405: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3406: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3407: /* an integrity error here indicates an incorrect passphrase */
3408: if (r == SSH_ERR_MAC_INVALID)
3409: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3410: goto out;
3411: }
1.18 djm 3412: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3413: goto out;
3414: /* there should be no trailing data */
3415: if (sshbuf_len(decoded) != 0) {
3416: r = SSH_ERR_INVALID_FORMAT;
3417: goto out;
3418: }
3419:
3420: /* check check bytes */
3421: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3422: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3423: goto out;
3424: if (check1 != check2) {
3425: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3426: goto out;
3427: }
1.103 djm 3428: /* success */
3429: *decryptedp = decrypted;
3430: decrypted = NULL;
1.104 djm 3431: *pubkeyp = pubkey;
3432: pubkey = NULL;
1.103 djm 3433: r = 0;
3434: out:
3435: cipher_free(ciphercontext);
3436: free(ciphername);
3437: free(kdfname);
1.104 djm 3438: sshkey_free(pubkey);
1.103 djm 3439: if (salt != NULL) {
3440: explicit_bzero(salt, slen);
3441: free(salt);
3442: }
3443: if (key != NULL) {
3444: explicit_bzero(key, keylen + ivlen);
3445: free(key);
3446: }
3447: sshbuf_free(kdf);
3448: sshbuf_free(decrypted);
3449: return r;
3450: }
3451:
3452: static int
3453: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3454: struct sshkey **keyp, char **commentp)
3455: {
3456: char *comment = NULL;
3457: int r = SSH_ERR_INTERNAL_ERROR;
3458: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 3459: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 3460:
3461: if (keyp != NULL)
3462: *keyp = NULL;
3463: if (commentp != NULL)
3464: *commentp = NULL;
3465:
3466: /* Undo base64 encoding and decrypt the private section */
3467: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 3468: (r = private2_decrypt(decoded, passphrase,
3469: &decrypted, &pubkey)) != 0)
1.103 djm 3470: goto out;
1.105 djm 3471:
3472: if (type != KEY_UNSPEC &&
3473: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3474: r = SSH_ERR_KEY_TYPE_MISMATCH;
3475: goto out;
3476: }
1.103 djm 3477:
3478: /* Load the private key and comment */
3479: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3480: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3481: goto out;
3482:
3483: /* Check deterministic padding after private section */
3484: if ((r = private2_check_padding(decrypted)) != 0)
3485: goto out;
1.1 djm 3486:
1.104 djm 3487: /* Check that the public key in the envelope matches the private key */
3488: if (!sshkey_equal(pubkey, k)) {
3489: r = SSH_ERR_INVALID_FORMAT;
3490: goto out;
3491: }
1.1 djm 3492:
3493: /* success */
3494: r = 0;
3495: if (keyp != NULL) {
3496: *keyp = k;
3497: k = NULL;
3498: }
3499: if (commentp != NULL) {
3500: *commentp = comment;
3501: comment = NULL;
3502: }
3503: out:
3504: free(comment);
3505: sshbuf_free(decoded);
3506: sshbuf_free(decrypted);
3507: sshkey_free(k);
1.104 djm 3508: sshkey_free(pubkey);
1.1 djm 3509: return r;
3510: }
3511:
1.107 djm 3512: static int
3513: sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3514: struct sshkey **keyp)
3515: {
3516: int r = SSH_ERR_INTERNAL_ERROR;
3517: struct sshbuf *decoded = NULL;
3518: struct sshkey *pubkey = NULL;
3519: u_int nkeys = 0;
3520:
3521: if (keyp != NULL)
3522: *keyp = NULL;
3523:
3524: if ((r = private2_uudecode(blob, &decoded)) != 0)
3525: goto out;
3526: /* parse public key from unencrypted envelope */
3527: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3528: (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
3529: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
3530: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
3531: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3532: goto out;
3533:
3534: if (nkeys != 1) {
3535: /* XXX only one key supported at present */
3536: r = SSH_ERR_INVALID_FORMAT;
3537: goto out;
3538: }
3539:
3540: /* Parse the public key */
3541: if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3542: goto out;
3543:
3544: if (type != KEY_UNSPEC &&
3545: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3546: r = SSH_ERR_KEY_TYPE_MISMATCH;
3547: goto out;
3548: }
3549:
3550: /* success */
3551: r = 0;
3552: if (keyp != NULL) {
3553: *keyp = pubkey;
3554: pubkey = NULL;
3555: }
3556: out:
3557: sshbuf_free(decoded);
3558: sshkey_free(pubkey);
3559: return r;
3560: }
3561:
1.1 djm 3562: #ifdef WITH_OPENSSL
1.80 djm 3563: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3564: static int
1.80 djm 3565: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3566: int format, const char *_passphrase, const char *comment)
1.1 djm 3567: {
1.76 djm 3568: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3569: int success, r;
3570: int blen, len = strlen(_passphrase);
3571: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3572: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3573: char *bptr;
1.1 djm 3574: BIO *bio = NULL;
1.76 djm 3575: struct sshbuf *blob;
1.80 djm 3576: EVP_PKEY *pkey = NULL;
1.1 djm 3577:
3578: if (len > 0 && len <= 4)
3579: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3580: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3581: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3582: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3583: r = SSH_ERR_ALLOC_FAIL;
3584: goto out;
3585: }
3586: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3587: r = SSH_ERR_ALLOC_FAIL;
3588: goto out;
1.76 djm 3589: }
3590: if ((r = sshkey_unshield_private(key)) != 0)
3591: goto out;
1.1 djm 3592:
3593: switch (key->type) {
3594: case KEY_DSA:
1.80 djm 3595: if (format == SSHKEY_PRIVATE_PEM) {
3596: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3597: cipher, passphrase, len, NULL, NULL);
3598: } else {
3599: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3600: }
1.1 djm 3601: break;
3602: case KEY_ECDSA:
1.80 djm 3603: if (format == SSHKEY_PRIVATE_PEM) {
3604: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3605: cipher, passphrase, len, NULL, NULL);
3606: } else {
3607: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3608: }
1.1 djm 3609: break;
3610: case KEY_RSA:
1.80 djm 3611: if (format == SSHKEY_PRIVATE_PEM) {
3612: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3613: cipher, passphrase, len, NULL, NULL);
3614: } else {
3615: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3616: }
1.1 djm 3617: break;
3618: default:
3619: success = 0;
3620: break;
3621: }
3622: if (success == 0) {
3623: r = SSH_ERR_LIBCRYPTO_ERROR;
3624: goto out;
3625: }
1.80 djm 3626: if (format == SSHKEY_PRIVATE_PKCS8) {
3627: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3628: passphrase, len, NULL, NULL)) == 0) {
3629: r = SSH_ERR_LIBCRYPTO_ERROR;
3630: goto out;
3631: }
3632: }
1.1 djm 3633: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3634: r = SSH_ERR_INTERNAL_ERROR;
3635: goto out;
3636: }
3637: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3638: goto out;
3639: r = 0;
3640: out:
1.76 djm 3641: if (was_shielded)
3642: r = sshkey_shield_private(key);
3643: if (r == 0)
3644: r = sshbuf_putb(buf, blob);
1.80 djm 3645:
3646: EVP_PKEY_free(pkey);
1.76 djm 3647: sshbuf_free(blob);
1.1 djm 3648: BIO_free(bio);
3649: return r;
3650: }
3651: #endif /* WITH_OPENSSL */
3652:
3653: /* Serialise "key" to buffer "blob" */
3654: int
3655: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3656: const char *passphrase, const char *comment,
1.80 djm 3657: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 3658: {
3659: switch (key->type) {
1.9 markus 3660: #ifdef WITH_OPENSSL
1.1 djm 3661: case KEY_DSA:
3662: case KEY_ECDSA:
3663: case KEY_RSA:
1.80 djm 3664: break; /* see below */
1.1 djm 3665: #endif /* WITH_OPENSSL */
3666: case KEY_ED25519:
1.90 markus 3667: case KEY_ED25519_SK:
1.62 markus 3668: #ifdef WITH_XMSS
3669: case KEY_XMSS:
3670: #endif /* WITH_XMSS */
1.85 djm 3671: #ifdef WITH_OPENSSL
3672: case KEY_ECDSA_SK:
3673: #endif /* WITH_OPENSSL */
1.1 djm 3674: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 3675: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 3676: default:
3677: return SSH_ERR_KEY_TYPE_UNKNOWN;
3678: }
1.80 djm 3679:
3680: #ifdef WITH_OPENSSL
3681: switch (format) {
3682: case SSHKEY_PRIVATE_OPENSSH:
3683: return sshkey_private_to_blob2(key, blob, passphrase,
3684: comment, openssh_format_cipher, openssh_format_rounds);
3685: case SSHKEY_PRIVATE_PEM:
3686: case SSHKEY_PRIVATE_PKCS8:
3687: return sshkey_private_to_blob_pem_pkcs8(key, blob,
3688: format, passphrase, comment);
3689: default:
3690: return SSH_ERR_INVALID_ARGUMENT;
3691: }
3692: #endif /* WITH_OPENSSL */
1.1 djm 3693: }
3694:
3695: #ifdef WITH_OPENSSL
1.8 djm 3696: static int
1.52 djm 3697: translate_libcrypto_error(unsigned long pem_err)
3698: {
3699: int pem_reason = ERR_GET_REASON(pem_err);
3700:
3701: switch (ERR_GET_LIB(pem_err)) {
3702: case ERR_LIB_PEM:
3703: switch (pem_reason) {
3704: case PEM_R_BAD_PASSWORD_READ:
3705: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3706: case PEM_R_BAD_DECRYPT:
3707: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3708: default:
3709: return SSH_ERR_INVALID_FORMAT;
3710: }
3711: case ERR_LIB_EVP:
3712: switch (pem_reason) {
3713: case EVP_R_BAD_DECRYPT:
3714: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3715: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3716: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3717: #endif
1.52 djm 3718: case EVP_R_DECODE_ERROR:
3719: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3720: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3721: #endif
3722: return SSH_ERR_INVALID_FORMAT;
3723: default:
3724: return SSH_ERR_LIBCRYPTO_ERROR;
3725: }
3726: case ERR_LIB_ASN1:
3727: return SSH_ERR_INVALID_FORMAT;
3728: }
3729: return SSH_ERR_LIBCRYPTO_ERROR;
3730: }
3731:
3732: static void
3733: clear_libcrypto_errors(void)
3734: {
3735: while (ERR_get_error() != 0)
3736: ;
3737: }
3738:
3739: /*
3740: * Translate OpenSSL error codes to determine whether
3741: * passphrase is required/incorrect.
3742: */
3743: static int
3744: convert_libcrypto_error(void)
3745: {
3746: /*
3747: * Some password errors are reported at the beginning
3748: * of the error queue.
3749: */
3750: if (translate_libcrypto_error(ERR_peek_error()) ==
3751: SSH_ERR_KEY_WRONG_PASSPHRASE)
3752: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3753: return translate_libcrypto_error(ERR_peek_last_error());
3754: }
3755:
3756: static int
1.1 djm 3757: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3758: const char *passphrase, struct sshkey **keyp)
1.1 djm 3759: {
3760: EVP_PKEY *pk = NULL;
3761: struct sshkey *prv = NULL;
3762: BIO *bio = NULL;
3763: int r;
3764:
1.32 djm 3765: if (keyp != NULL)
3766: *keyp = NULL;
1.1 djm 3767:
3768: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3769: return SSH_ERR_ALLOC_FAIL;
3770: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3771: (int)sshbuf_len(blob)) {
3772: r = SSH_ERR_ALLOC_FAIL;
3773: goto out;
3774: }
3775:
1.52 djm 3776: clear_libcrypto_errors();
1.1 djm 3777: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3778: (char *)passphrase)) == NULL) {
1.116 djm 3779: /*
3780: * libcrypto may return various ASN.1 errors when attempting
3781: * to parse a key with an incorrect passphrase.
3782: * Treat all format errors as "incorrect passphrase" if a
3783: * passphrase was supplied.
3784: */
1.71 djm 3785: if (passphrase != NULL && *passphrase != '\0')
3786: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3787: else
3788: r = convert_libcrypto_error();
1.1 djm 3789: goto out;
3790: }
1.69 djm 3791: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3792: (type == KEY_UNSPEC || type == KEY_RSA)) {
3793: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3794: r = SSH_ERR_ALLOC_FAIL;
3795: goto out;
3796: }
3797: prv->rsa = EVP_PKEY_get1_RSA(pk);
3798: prv->type = KEY_RSA;
3799: #ifdef DEBUG_PK
3800: RSA_print_fp(stderr, prv->rsa, 8);
3801: #endif
3802: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3803: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3804: goto out;
3805: }
1.122 djm 3806: if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
1.1 djm 3807: goto out;
1.69 djm 3808: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3809: (type == KEY_UNSPEC || type == KEY_DSA)) {
3810: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3811: r = SSH_ERR_ALLOC_FAIL;
3812: goto out;
3813: }
3814: prv->dsa = EVP_PKEY_get1_DSA(pk);
3815: prv->type = KEY_DSA;
3816: #ifdef DEBUG_PK
3817: DSA_print_fp(stderr, prv->dsa, 8);
3818: #endif
1.69 djm 3819: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3820: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3821: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3822: r = SSH_ERR_ALLOC_FAIL;
3823: goto out;
3824: }
3825: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3826: prv->type = KEY_ECDSA;
3827: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3828: if (prv->ecdsa_nid == -1 ||
3829: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3830: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3831: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3832: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3833: r = SSH_ERR_INVALID_FORMAT;
3834: goto out;
3835: }
3836: #ifdef DEBUG_PK
3837: if (prv != NULL && prv->ecdsa != NULL)
3838: sshkey_dump_ec_key(prv->ecdsa);
3839: #endif
3840: } else {
3841: r = SSH_ERR_INVALID_FORMAT;
3842: goto out;
3843: }
3844: r = 0;
1.32 djm 3845: if (keyp != NULL) {
3846: *keyp = prv;
3847: prv = NULL;
3848: }
1.1 djm 3849: out:
3850: BIO_free(bio);
1.60 jsing 3851: EVP_PKEY_free(pk);
1.30 mmcc 3852: sshkey_free(prv);
1.1 djm 3853: return r;
3854: }
3855: #endif /* WITH_OPENSSL */
3856:
3857: int
3858: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3859: const char *passphrase, struct sshkey **keyp, char **commentp)
3860: {
1.42 djm 3861: int r = SSH_ERR_INTERNAL_ERROR;
3862:
1.32 djm 3863: if (keyp != NULL)
3864: *keyp = NULL;
1.1 djm 3865: if (commentp != NULL)
3866: *commentp = NULL;
3867:
3868: switch (type) {
3869: case KEY_ED25519:
1.62 markus 3870: case KEY_XMSS:
1.106 djm 3871: /* No fallback for new-format-only keys */
1.1 djm 3872: return sshkey_parse_private2(blob, type, passphrase,
3873: keyp, commentp);
1.106 djm 3874: default:
1.42 djm 3875: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3876: commentp);
1.106 djm 3877: /* Only fallback to PEM parser if a format error occurred. */
3878: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 3879: return r;
1.1 djm 3880: #ifdef WITH_OPENSSL
1.8 djm 3881: return sshkey_parse_private_pem_fileblob(blob, type,
3882: passphrase, keyp);
1.1 djm 3883: #else
3884: return SSH_ERR_INVALID_FORMAT;
3885: #endif /* WITH_OPENSSL */
3886: }
3887: }
3888:
3889: int
3890: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3891: struct sshkey **keyp, char **commentp)
1.1 djm 3892: {
3893: if (keyp != NULL)
3894: *keyp = NULL;
3895: if (commentp != NULL)
3896: *commentp = NULL;
3897:
1.23 tim 3898: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3899: passphrase, keyp, commentp);
1.96 djm 3900: }
3901:
3902: void
3903: sshkey_sig_details_free(struct sshkey_sig_details *details)
3904: {
3905: freezero(details, sizeof(*details));
1.107 djm 3906: }
3907:
3908: int
3909: sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
3910: struct sshkey **pubkeyp)
3911: {
3912: int r = SSH_ERR_INTERNAL_ERROR;
3913:
3914: if (pubkeyp != NULL)
3915: *pubkeyp = NULL;
3916: /* only new-format private keys bundle a public key inside */
3917: if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
3918: return r;
3919: return 0;
1.1 djm 3920: }
1.62 markus 3921:
3922: #ifdef WITH_XMSS
3923: /*
3924: * serialize the key with the current state and forward the state
3925: * maxsign times.
3926: */
3927: int
1.77 djm 3928: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3929: u_int32_t maxsign, int printerror)
1.62 markus 3930: {
3931: int r, rupdate;
3932:
3933: if (maxsign == 0 ||
3934: sshkey_type_plain(k->type) != KEY_XMSS)
3935: return sshkey_private_serialize_opt(k, b,
3936: SSHKEY_SERIALIZE_DEFAULT);
1.112 dtucker 3937: if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
1.62 markus 3938: (r = sshkey_private_serialize_opt(k, b,
3939: SSHKEY_SERIALIZE_STATE)) != 0 ||
3940: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3941: goto out;
3942: r = 0;
3943: out:
1.112 dtucker 3944: if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
1.62 markus 3945: if (r == 0)
3946: r = rupdate;
3947: }
3948: return r;
3949: }
3950:
3951: u_int32_t
3952: sshkey_signatures_left(const struct sshkey *k)
3953: {
3954: if (sshkey_type_plain(k->type) == KEY_XMSS)
3955: return sshkey_xmss_signatures_left(k);
3956: return 0;
3957: }
3958:
3959: int
3960: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3961: {
3962: if (sshkey_type_plain(k->type) != KEY_XMSS)
3963: return SSH_ERR_INVALID_ARGUMENT;
3964: return sshkey_xmss_enable_maxsign(k, maxsign);
3965: }
3966:
3967: int
3968: sshkey_set_filename(struct sshkey *k, const char *filename)
3969: {
3970: if (k == NULL)
3971: return SSH_ERR_INVALID_ARGUMENT;
3972: if (sshkey_type_plain(k->type) != KEY_XMSS)
3973: return 0;
3974: if (filename == NULL)
3975: return SSH_ERR_INVALID_ARGUMENT;
3976: if ((k->xmss_filename = strdup(filename)) == NULL)
3977: return SSH_ERR_ALLOC_FAIL;
3978: return 0;
3979: }
3980: #else
3981: int
1.76 djm 3982: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3983: u_int32_t maxsign, int printerror)
1.62 markus 3984: {
3985: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
3986: }
3987:
3988: u_int32_t
3989: sshkey_signatures_left(const struct sshkey *k)
3990: {
3991: return 0;
3992: }
3993:
3994: int
3995: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3996: {
3997: return SSH_ERR_INVALID_ARGUMENT;
3998: }
3999:
4000: int
4001: sshkey_set_filename(struct sshkey *k, const char *filename)
4002: {
4003: if (k == NULL)
4004: return SSH_ERR_INVALID_ARGUMENT;
4005: return 0;
4006: }
4007: #endif /* WITH_XMSS */
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