Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.129
1.129 ! djm 1: /* $OpenBSD: sshkey.c,v 1.128 2022/10/28 00:41:17 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;
2012:
1.1 djm 2013: if (sigp != NULL)
2014: *sigp = NULL;
2015: if (lenp != NULL)
2016: *lenp = 0;
2017: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2018: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2019: if ((r = sshkey_unshield_private(key)) != 0)
2020: return r;
1.1 djm 2021: switch (key->type) {
2022: #ifdef WITH_OPENSSL
2023: case KEY_DSA_CERT:
2024: case KEY_DSA:
1.76 djm 2025: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2026: break;
1.1 djm 2027: case KEY_ECDSA_CERT:
2028: case KEY_ECDSA:
1.76 djm 2029: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2030: break;
1.1 djm 2031: case KEY_RSA_CERT:
2032: case KEY_RSA:
1.76 djm 2033: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2034: break;
1.1 djm 2035: #endif /* WITH_OPENSSL */
2036: case KEY_ED25519:
2037: case KEY_ED25519_CERT:
1.76 djm 2038: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2039: break;
2040: case KEY_ED25519_SK:
2041: case KEY_ED25519_SK_CERT:
1.97 djm 2042: case KEY_ECDSA_SK_CERT:
2043: case KEY_ECDSA_SK:
2044: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.111 djm 2045: datalen, compat, sk_pin);
1.76 djm 2046: break;
1.62 markus 2047: #ifdef WITH_XMSS
2048: case KEY_XMSS:
2049: case KEY_XMSS_CERT:
1.76 djm 2050: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2051: break;
1.62 markus 2052: #endif /* WITH_XMSS */
1.1 djm 2053: default:
1.76 djm 2054: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2055: break;
1.1 djm 2056: }
1.76 djm 2057: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2058: return r2;
2059: return r;
1.1 djm 2060: }
2061:
2062: /*
2063: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2064: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2065: */
2066: int
2067: sshkey_verify(const struct sshkey *key,
2068: const u_char *sig, size_t siglen,
1.96 djm 2069: const u_char *data, size_t dlen, const char *alg, u_int compat,
2070: struct sshkey_sig_details **detailsp)
1.1 djm 2071: {
1.96 djm 2072: if (detailsp != NULL)
2073: *detailsp = NULL;
1.6 djm 2074: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2075: return SSH_ERR_INVALID_ARGUMENT;
2076: switch (key->type) {
2077: #ifdef WITH_OPENSSL
2078: case KEY_DSA_CERT:
2079: case KEY_DSA:
2080: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2081: case KEY_ECDSA_CERT:
2082: case KEY_ECDSA:
2083: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2084: case KEY_ECDSA_SK_CERT:
2085: case KEY_ECDSA_SK:
2086: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2087: compat, detailsp);
1.1 djm 2088: case KEY_RSA_CERT:
2089: case KEY_RSA:
1.59 djm 2090: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2091: #endif /* WITH_OPENSSL */
2092: case KEY_ED25519:
2093: case KEY_ED25519_CERT:
2094: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2095: case KEY_ED25519_SK:
2096: case KEY_ED25519_SK_CERT:
2097: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2098: compat, detailsp);
1.62 markus 2099: #ifdef WITH_XMSS
2100: case KEY_XMSS:
2101: case KEY_XMSS_CERT:
2102: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2103: #endif /* WITH_XMSS */
1.1 djm 2104: default:
2105: return SSH_ERR_KEY_TYPE_UNKNOWN;
2106: }
2107: }
2108:
2109: /* Convert a plain key to their _CERT equivalent */
2110: int
1.20 djm 2111: sshkey_to_certified(struct sshkey *k)
1.1 djm 2112: {
2113: int newtype;
2114:
2115: switch (k->type) {
2116: #ifdef WITH_OPENSSL
2117: case KEY_RSA:
1.20 djm 2118: newtype = KEY_RSA_CERT;
1.1 djm 2119: break;
2120: case KEY_DSA:
1.20 djm 2121: newtype = KEY_DSA_CERT;
1.1 djm 2122: break;
2123: case KEY_ECDSA:
2124: newtype = KEY_ECDSA_CERT;
2125: break;
1.85 djm 2126: case KEY_ECDSA_SK:
2127: newtype = KEY_ECDSA_SK_CERT;
2128: break;
1.1 djm 2129: #endif /* WITH_OPENSSL */
1.90 markus 2130: case KEY_ED25519_SK:
2131: newtype = KEY_ED25519_SK_CERT;
2132: break;
1.1 djm 2133: case KEY_ED25519:
2134: newtype = KEY_ED25519_CERT;
2135: break;
1.62 markus 2136: #ifdef WITH_XMSS
2137: case KEY_XMSS:
2138: newtype = KEY_XMSS_CERT;
2139: break;
2140: #endif /* WITH_XMSS */
1.1 djm 2141: default:
2142: return SSH_ERR_INVALID_ARGUMENT;
2143: }
2144: if ((k->cert = cert_new()) == NULL)
2145: return SSH_ERR_ALLOC_FAIL;
2146: k->type = newtype;
2147: return 0;
2148: }
2149:
2150: /* Convert a certificate to its raw key equivalent */
2151: int
2152: sshkey_drop_cert(struct sshkey *k)
2153: {
2154: if (!sshkey_type_is_cert(k->type))
2155: return SSH_ERR_KEY_TYPE_UNKNOWN;
2156: cert_free(k->cert);
2157: k->cert = NULL;
2158: k->type = sshkey_type_plain(k->type);
2159: return 0;
2160: }
2161:
2162: /* Sign a certified key, (re-)generating the signed certblob. */
2163: int
1.53 djm 2164: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2165: const char *sk_provider, const char *sk_pin,
2166: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2167: {
2168: struct sshbuf *principals = NULL;
2169: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2170: size_t i, ca_len, sig_len;
2171: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2172: struct sshbuf *cert = NULL;
2173: char *sigtype = NULL;
1.69 djm 2174: #ifdef WITH_OPENSSL
2175: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2176: #endif /* WITH_OPENSSL */
1.1 djm 2177:
2178: if (k == NULL || k->cert == NULL ||
2179: k->cert->certblob == NULL || ca == NULL)
2180: return SSH_ERR_INVALID_ARGUMENT;
2181: if (!sshkey_is_cert(k))
2182: return SSH_ERR_KEY_TYPE_UNKNOWN;
2183: if (!sshkey_type_is_valid_ca(ca->type))
2184: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2185:
1.67 djm 2186: /*
2187: * If no alg specified as argument but a signature_type was set,
2188: * then prefer that. If both were specified, then they must match.
2189: */
2190: if (alg == NULL)
2191: alg = k->cert->signature_type;
2192: else if (k->cert->signature_type != NULL &&
2193: strcmp(alg, k->cert->signature_type) != 0)
2194: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2195:
2196: /*
2197: * If no signing algorithm or signature_type was specified and we're
2198: * using a RSA key, then default to a good signature algorithm.
2199: */
2200: if (alg == NULL && ca->type == KEY_RSA)
2201: alg = "rsa-sha2-512";
1.67 djm 2202:
1.1 djm 2203: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2204: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2205:
2206: cert = k->cert->certblob; /* for readability */
2207: sshbuf_reset(cert);
2208: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2209: goto out;
2210:
2211: /* -v01 certs put nonce first */
2212: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2213: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2214: goto out;
1.1 djm 2215:
2216: /* XXX this substantially duplicates to_blob(); refactor */
2217: switch (k->type) {
2218: #ifdef WITH_OPENSSL
2219: case KEY_DSA_CERT:
1.69 djm 2220: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2221: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2222: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2223: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2224: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2225: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2226: goto out;
2227: break;
2228: case KEY_ECDSA_CERT:
1.85 djm 2229: case KEY_ECDSA_SK_CERT:
1.1 djm 2230: if ((ret = sshbuf_put_cstring(cert,
2231: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2232: (ret = sshbuf_put_ec(cert,
2233: EC_KEY_get0_public_key(k->ecdsa),
2234: EC_KEY_get0_group(k->ecdsa))) != 0)
2235: goto out;
1.85 djm 2236: if (k->type == KEY_ECDSA_SK_CERT) {
2237: if ((ret = sshbuf_put_cstring(cert,
2238: k->sk_application)) != 0)
2239: goto out;
2240: }
1.1 djm 2241: break;
2242: case KEY_RSA_CERT:
1.69 djm 2243: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2244: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2245: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2246: goto out;
2247: break;
2248: #endif /* WITH_OPENSSL */
2249: case KEY_ED25519_CERT:
1.94 djm 2250: case KEY_ED25519_SK_CERT:
1.1 djm 2251: if ((ret = sshbuf_put_string(cert,
2252: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2253: goto out;
1.94 djm 2254: if (k->type == KEY_ED25519_SK_CERT) {
2255: if ((ret = sshbuf_put_cstring(cert,
2256: k->sk_application)) != 0)
2257: goto out;
2258: }
1.1 djm 2259: break;
1.62 markus 2260: #ifdef WITH_XMSS
2261: case KEY_XMSS_CERT:
2262: if (k->xmss_name == NULL) {
2263: ret = SSH_ERR_INVALID_ARGUMENT;
2264: goto out;
2265: }
2266: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2267: (ret = sshbuf_put_string(cert,
2268: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2269: goto out;
2270: break;
2271: #endif /* WITH_XMSS */
1.1 djm 2272: default:
2273: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2274: goto out;
1.1 djm 2275: }
2276:
1.20 djm 2277: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2278: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2279: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2280: goto out;
2281:
2282: if ((principals = sshbuf_new()) == NULL) {
2283: ret = SSH_ERR_ALLOC_FAIL;
2284: goto out;
2285: }
2286: for (i = 0; i < k->cert->nprincipals; i++) {
2287: if ((ret = sshbuf_put_cstring(principals,
2288: k->cert->principals[i])) != 0)
2289: goto out;
2290: }
2291: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2292: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2293: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2294: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2295: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2296: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2297: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2298: goto out;
2299:
2300: /* Sign the whole mess */
1.53 djm 2301: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.111 djm 2302: sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
1.1 djm 2303: goto out;
1.67 djm 2304: /* Check and update signature_type against what was actually used */
1.82 djm 2305: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2306: goto out;
2307: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2308: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2309: goto out;
2310: }
2311: if (k->cert->signature_type == NULL) {
2312: k->cert->signature_type = sigtype;
2313: sigtype = NULL;
2314: }
1.1 djm 2315: /* Append signature and we are done */
2316: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2317: goto out;
2318: ret = 0;
2319: out:
2320: if (ret != 0)
2321: sshbuf_reset(cert);
1.29 mmcc 2322: free(sig_blob);
2323: free(ca_blob);
1.67 djm 2324: free(sigtype);
1.31 mmcc 2325: sshbuf_free(principals);
1.1 djm 2326: return ret;
1.53 djm 2327: }
2328:
2329: static int
1.76 djm 2330: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2331: const u_char *data, size_t datalen,
1.111 djm 2332: const char *alg, const char *sk_provider, const char *sk_pin,
2333: u_int compat, void *ctx)
1.53 djm 2334: {
2335: if (ctx != NULL)
2336: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2337: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
1.111 djm 2338: sk_provider, sk_pin, compat);
1.53 djm 2339: }
2340:
2341: int
1.86 djm 2342: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2343: const char *sk_provider, const char *sk_pin)
1.53 djm 2344: {
1.111 djm 2345: return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
1.86 djm 2346: default_key_sign, NULL);
1.1 djm 2347: }
2348:
2349: int
2350: sshkey_cert_check_authority(const struct sshkey *k,
1.114 djm 2351: int want_host, int require_principal, int wildcard_pattern,
1.119 djm 2352: uint64_t verify_time, const char *name, const char **reason)
1.1 djm 2353: {
2354: u_int i, principal_matches;
2355:
1.102 markus 2356: if (reason == NULL)
2357: return SSH_ERR_INVALID_ARGUMENT;
1.114 djm 2358: if (!sshkey_is_cert(k)) {
2359: *reason = "Key is not a certificate";
2360: return SSH_ERR_KEY_CERT_INVALID;
2361: }
1.1 djm 2362: if (want_host) {
2363: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2364: *reason = "Certificate invalid: not a host certificate";
2365: return SSH_ERR_KEY_CERT_INVALID;
2366: }
2367: } else {
2368: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2369: *reason = "Certificate invalid: not a user certificate";
2370: return SSH_ERR_KEY_CERT_INVALID;
2371: }
2372: }
1.119 djm 2373: if (verify_time < k->cert->valid_after) {
1.1 djm 2374: *reason = "Certificate invalid: not yet valid";
2375: return SSH_ERR_KEY_CERT_INVALID;
2376: }
1.119 djm 2377: if (verify_time >= k->cert->valid_before) {
1.1 djm 2378: *reason = "Certificate invalid: expired";
2379: return SSH_ERR_KEY_CERT_INVALID;
2380: }
2381: if (k->cert->nprincipals == 0) {
2382: if (require_principal) {
2383: *reason = "Certificate lacks principal list";
2384: return SSH_ERR_KEY_CERT_INVALID;
2385: }
2386: } else if (name != NULL) {
2387: principal_matches = 0;
2388: for (i = 0; i < k->cert->nprincipals; i++) {
1.114 djm 2389: if (wildcard_pattern) {
2390: if (match_pattern(k->cert->principals[i],
2391: name)) {
2392: principal_matches = 1;
2393: break;
2394: }
2395: } else if (strcmp(name, k->cert->principals[i]) == 0) {
1.1 djm 2396: principal_matches = 1;
2397: break;
2398: }
2399: }
2400: if (!principal_matches) {
2401: *reason = "Certificate invalid: name is not a listed "
2402: "principal";
2403: return SSH_ERR_KEY_CERT_INVALID;
2404: }
1.114 djm 2405: }
2406: return 0;
2407: }
2408:
2409: int
1.119 djm 2410: sshkey_cert_check_authority_now(const struct sshkey *k,
2411: int want_host, int require_principal, int wildcard_pattern,
2412: const char *name, const char **reason)
2413: {
2414: time_t now;
2415:
2416: if ((now = time(NULL)) < 0) {
2417: /* yikes - system clock before epoch! */
2418: *reason = "Certificate invalid: not yet valid";
2419: return SSH_ERR_KEY_CERT_INVALID;
2420: }
2421: return sshkey_cert_check_authority(k, want_host, require_principal,
2422: wildcard_pattern, (uint64_t)now, name, reason);
2423: }
2424:
2425: int
1.114 djm 2426: sshkey_cert_check_host(const struct sshkey *key, const char *host,
2427: int wildcard_principals, const char *ca_sign_algorithms,
2428: const char **reason)
2429: {
2430: int r;
2431:
1.119 djm 2432: if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
1.114 djm 2433: host, reason)) != 0)
2434: return r;
2435: if (sshbuf_len(key->cert->critical) != 0) {
2436: *reason = "Certificate contains unsupported critical options";
2437: return SSH_ERR_KEY_CERT_INVALID;
2438: }
2439: if (ca_sign_algorithms != NULL &&
2440: (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2441: *reason = "Certificate signed with disallowed algorithm";
2442: return SSH_ERR_KEY_CERT_INVALID;
1.1 djm 2443: }
2444: return 0;
1.27 djm 2445: }
2446:
2447: size_t
2448: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2449: {
1.113 dtucker 2450: char from[32], to[32], ret[128];
1.27 djm 2451:
2452: *from = *to = '\0';
2453: if (cert->valid_after == 0 &&
2454: cert->valid_before == 0xffffffffffffffffULL)
2455: return strlcpy(s, "forever", l);
2456:
1.118 dtucker 2457: if (cert->valid_after != 0)
2458: format_absolute_time(cert->valid_after, from, sizeof(from));
2459: if (cert->valid_before != 0xffffffffffffffffULL)
2460: format_absolute_time(cert->valid_before, to, sizeof(to));
1.27 djm 2461:
2462: if (cert->valid_after == 0)
2463: snprintf(ret, sizeof(ret), "before %s", to);
2464: else if (cert->valid_before == 0xffffffffffffffffULL)
2465: snprintf(ret, sizeof(ret), "after %s", from);
2466: else
2467: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2468:
2469: return strlcpy(s, ret, l);
1.1 djm 2470: }
2471:
2472: int
1.76 djm 2473: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2474: enum sshkey_serialize_rep opts)
1.1 djm 2475: {
2476: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2477: int was_shielded = sshkey_is_shielded(key);
2478: struct sshbuf *b = NULL;
1.69 djm 2479: #ifdef WITH_OPENSSL
2480: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2481: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2482: #endif /* WITH_OPENSSL */
1.1 djm 2483:
1.76 djm 2484: if ((r = sshkey_unshield_private(key)) != 0)
2485: return r;
2486: if ((b = sshbuf_new()) == NULL)
2487: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2488: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2489: goto out;
2490: switch (key->type) {
2491: #ifdef WITH_OPENSSL
2492: case KEY_RSA:
1.69 djm 2493: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2494: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2495: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2496: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2497: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2498: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2499: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2500: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2501: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2502: goto out;
2503: break;
2504: case KEY_RSA_CERT:
2505: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2506: r = SSH_ERR_INVALID_ARGUMENT;
2507: goto out;
2508: }
1.69 djm 2509: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2510: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2511: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2512: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2513: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2514: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2515: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2516: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2517: goto out;
2518: break;
2519: case KEY_DSA:
1.69 djm 2520: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2521: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2522: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2523: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2524: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2525: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2526: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2527: goto out;
2528: break;
2529: case KEY_DSA_CERT:
2530: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2531: r = SSH_ERR_INVALID_ARGUMENT;
2532: goto out;
2533: }
1.69 djm 2534: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2535: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2536: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2537: goto out;
2538: break;
2539: case KEY_ECDSA:
2540: if ((r = sshbuf_put_cstring(b,
2541: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2542: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2543: (r = sshbuf_put_bignum2(b,
2544: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2545: goto out;
2546: break;
2547: case KEY_ECDSA_CERT:
2548: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2549: r = SSH_ERR_INVALID_ARGUMENT;
2550: goto out;
2551: }
2552: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2553: (r = sshbuf_put_bignum2(b,
2554: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2555: goto out;
2556: break;
1.85 djm 2557: case KEY_ECDSA_SK:
2558: if ((r = sshbuf_put_cstring(b,
2559: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2560: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2561: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2562: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2563: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2564: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2565: goto out;
2566: break;
2567: case KEY_ECDSA_SK_CERT:
2568: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2569: r = SSH_ERR_INVALID_ARGUMENT;
2570: goto out;
2571: }
2572: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2573: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2574: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2575: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2576: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2577: goto out;
2578: break;
1.1 djm 2579: #endif /* WITH_OPENSSL */
2580: case KEY_ED25519:
2581: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2582: ED25519_PK_SZ)) != 0 ||
2583: (r = sshbuf_put_string(b, key->ed25519_sk,
2584: ED25519_SK_SZ)) != 0)
2585: goto out;
2586: break;
2587: case KEY_ED25519_CERT:
2588: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2589: r = SSH_ERR_INVALID_ARGUMENT;
2590: goto out;
2591: }
2592: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2593: (r = sshbuf_put_string(b, key->ed25519_pk,
2594: ED25519_PK_SZ)) != 0 ||
2595: (r = sshbuf_put_string(b, key->ed25519_sk,
2596: ED25519_SK_SZ)) != 0)
2597: goto out;
2598: break;
1.90 markus 2599: case KEY_ED25519_SK:
2600: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2601: ED25519_PK_SZ)) != 0 ||
2602: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2603: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2604: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2605: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2606: goto out;
2607: break;
2608: case KEY_ED25519_SK_CERT:
2609: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2610: r = SSH_ERR_INVALID_ARGUMENT;
2611: goto out;
2612: }
2613: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2614: (r = sshbuf_put_string(b, key->ed25519_pk,
2615: ED25519_PK_SZ)) != 0 ||
2616: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2617: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2618: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2619: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2620: goto out;
2621: break;
1.62 markus 2622: #ifdef WITH_XMSS
2623: case KEY_XMSS:
2624: if (key->xmss_name == NULL) {
2625: r = SSH_ERR_INVALID_ARGUMENT;
2626: goto out;
2627: }
2628: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2629: (r = sshbuf_put_string(b, key->xmss_pk,
2630: sshkey_xmss_pklen(key))) != 0 ||
2631: (r = sshbuf_put_string(b, key->xmss_sk,
2632: sshkey_xmss_sklen(key))) != 0 ||
2633: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2634: goto out;
2635: break;
2636: case KEY_XMSS_CERT:
2637: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2638: key->xmss_name == NULL) {
2639: r = SSH_ERR_INVALID_ARGUMENT;
2640: goto out;
2641: }
2642: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2643: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2644: (r = sshbuf_put_string(b, key->xmss_pk,
2645: sshkey_xmss_pklen(key))) != 0 ||
2646: (r = sshbuf_put_string(b, key->xmss_sk,
2647: sshkey_xmss_sklen(key))) != 0 ||
2648: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2649: goto out;
2650: break;
2651: #endif /* WITH_XMSS */
1.1 djm 2652: default:
2653: r = SSH_ERR_INVALID_ARGUMENT;
2654: goto out;
2655: }
1.76 djm 2656: /*
2657: * success (but we still need to append the output to buf after
2658: * possibly re-shielding the private key)
2659: */
1.1 djm 2660: r = 0;
2661: out:
1.76 djm 2662: if (was_shielded)
2663: r = sshkey_shield_private(key);
2664: if (r == 0)
2665: r = sshbuf_putb(buf, b);
2666: sshbuf_free(b);
2667:
1.1 djm 2668: return r;
2669: }
2670:
2671: int
1.76 djm 2672: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 2673: {
2674: return sshkey_private_serialize_opt(key, b,
2675: SSHKEY_SERIALIZE_DEFAULT);
2676: }
2677:
2678: int
1.1 djm 2679: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2680: {
1.62 markus 2681: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.115 djm 2682: char *expect_sk_application = NULL;
1.1 djm 2683: struct sshkey *k = NULL;
1.14 djm 2684: size_t pklen = 0, sklen = 0;
1.1 djm 2685: int type, r = SSH_ERR_INTERNAL_ERROR;
2686: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.115 djm 2687: u_char *expect_ed25519_pk = NULL;
1.62 markus 2688: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2689: #ifdef WITH_OPENSSL
2690: BIGNUM *exponent = NULL;
1.69 djm 2691: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2692: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2693: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2694: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2695: #endif /* WITH_OPENSSL */
2696:
2697: if (kp != NULL)
2698: *kp = NULL;
2699: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2700: goto out;
2701: type = sshkey_type_from_name(tname);
1.108 djm 2702: if (sshkey_type_is_cert(type)) {
2703: /*
2704: * Certificate key private keys begin with the certificate
2705: * itself. Make sure this matches the type of the enclosing
2706: * private key.
2707: */
2708: if ((r = sshkey_froms(buf, &k)) != 0)
2709: goto out;
2710: if (k->type != type) {
2711: r = SSH_ERR_KEY_CERT_MISMATCH;
2712: goto out;
2713: }
2714: /* For ECDSA keys, the group must match too */
2715: if (k->type == KEY_ECDSA &&
2716: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2717: r = SSH_ERR_KEY_CERT_MISMATCH;
2718: goto out;
2719: }
1.115 djm 2720: /*
2721: * Several fields are redundant between certificate and
2722: * private key body, we require these to match.
2723: */
2724: expect_sk_application = k->sk_application;
2725: expect_ed25519_pk = k->ed25519_pk;
2726: k->sk_application = NULL;
2727: k->ed25519_pk = NULL;
1.108 djm 2728: } else {
1.70 djm 2729: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2730: r = SSH_ERR_ALLOC_FAIL;
2731: goto out;
2732: }
1.108 djm 2733: }
2734: switch (type) {
2735: #ifdef WITH_OPENSSL
2736: case KEY_DSA:
1.73 djm 2737: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
2738: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
2739: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
1.108 djm 2740: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0)
1.69 djm 2741: goto out;
2742: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2743: r = SSH_ERR_LIBCRYPTO_ERROR;
2744: goto out;
2745: }
2746: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
1.108 djm 2747: if (!DSA_set0_key(k->dsa, dsa_pub_key, NULL)) {
1.69 djm 2748: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2749: goto out;
1.69 djm 2750: }
1.108 djm 2751: dsa_pub_key = NULL; /* transferred */
2752: /* FALLTHROUGH */
1.1 djm 2753: case KEY_DSA_CERT:
1.108 djm 2754: if ((r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.84 djm 2755: goto out;
1.69 djm 2756: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2757: r = SSH_ERR_LIBCRYPTO_ERROR;
2758: goto out;
2759: }
2760: dsa_priv_key = NULL; /* transferred */
1.1 djm 2761: break;
2762: case KEY_ECDSA:
2763: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2764: r = SSH_ERR_INVALID_ARGUMENT;
2765: goto out;
2766: }
2767: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2768: goto out;
2769: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2770: r = SSH_ERR_EC_CURVE_MISMATCH;
2771: goto out;
2772: }
2773: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 2774: if (k->ecdsa == NULL) {
1.1 djm 2775: r = SSH_ERR_LIBCRYPTO_ERROR;
2776: goto out;
2777: }
1.108 djm 2778: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0)
1.1 djm 2779: goto out;
1.108 djm 2780: /* FALLTHROUGH */
1.1 djm 2781: case KEY_ECDSA_CERT:
1.108 djm 2782: if ((r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 2783: goto out;
2784: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2785: r = SSH_ERR_LIBCRYPTO_ERROR;
2786: goto out;
2787: }
2788: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2789: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2790: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2791: goto out;
2792: break;
1.85 djm 2793: case KEY_ECDSA_SK:
2794: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2795: r = SSH_ERR_INVALID_ARGUMENT;
2796: goto out;
2797: }
2798: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2799: goto out;
2800: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2801: r = SSH_ERR_EC_CURVE_MISMATCH;
2802: goto out;
2803: }
2804: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2805: (k->sk_reserved = sshbuf_new()) == NULL) {
2806: r = SSH_ERR_ALLOC_FAIL;
2807: goto out;
2808: }
2809: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2810: if (k->ecdsa == NULL) {
2811: r = SSH_ERR_LIBCRYPTO_ERROR;
2812: goto out;
2813: }
2814: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2815: (r = sshbuf_get_cstring(buf, &k->sk_application,
2816: NULL)) != 0 ||
2817: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2818: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2819: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2820: goto out;
2821: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2822: EC_KEY_get0_public_key(k->ecdsa))) != 0)
2823: goto out;
2824: break;
2825: case KEY_ECDSA_SK_CERT:
2826: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2827: (k->sk_reserved = sshbuf_new()) == NULL) {
2828: r = SSH_ERR_ALLOC_FAIL;
2829: goto out;
2830: }
2831: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
2832: NULL)) != 0 ||
2833: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2834: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2835: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2836: goto out;
2837: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2838: EC_KEY_get0_public_key(k->ecdsa))) != 0)
2839: goto out;
2840: break;
1.1 djm 2841: case KEY_RSA:
1.73 djm 2842: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
1.108 djm 2843: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0)
1.1 djm 2844: goto out;
1.108 djm 2845: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, NULL)) {
1.69 djm 2846: r = SSH_ERR_LIBCRYPTO_ERROR;
2847: goto out;
2848: }
1.108 djm 2849: rsa_n = rsa_e = NULL; /* transferred */
2850: /* FALLTHROUGH */
1.1 djm 2851: case KEY_RSA_CERT:
1.108 djm 2852: if ((r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
1.73 djm 2853: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
2854: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
2855: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 2856: goto out;
1.69 djm 2857: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
2858: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2859: goto out;
2860: }
1.69 djm 2861: rsa_d = NULL; /* transferred */
2862: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
2863: r = SSH_ERR_LIBCRYPTO_ERROR;
2864: goto out;
2865: }
2866: rsa_p = rsa_q = NULL; /* transferred */
1.122 djm 2867: if ((r = sshkey_check_rsa_length(k, 0)) != 0)
1.69 djm 2868: goto out;
2869: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
2870: goto out;
1.1 djm 2871: break;
2872: #endif /* WITH_OPENSSL */
2873: case KEY_ED25519:
1.108 djm 2874: case KEY_ED25519_CERT:
1.1 djm 2875: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2876: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2877: goto out;
2878: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2879: r = SSH_ERR_INVALID_FORMAT;
2880: goto out;
2881: }
2882: k->ed25519_pk = ed25519_pk;
2883: k->ed25519_sk = ed25519_sk;
1.84 djm 2884: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 2885: break;
1.90 markus 2886: case KEY_ED25519_SK:
1.108 djm 2887: case KEY_ED25519_SK_CERT:
1.90 markus 2888: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
2889: goto out;
2890: if (pklen != ED25519_PK_SZ) {
2891: r = SSH_ERR_INVALID_FORMAT;
2892: goto out;
2893: }
2894: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2895: (k->sk_reserved = sshbuf_new()) == NULL) {
2896: r = SSH_ERR_ALLOC_FAIL;
2897: goto out;
2898: }
2899: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
2900: NULL)) != 0 ||
2901: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2902: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2903: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2904: goto out;
2905: k->ed25519_pk = ed25519_pk;
2906: ed25519_pk = NULL; /* transferred */
2907: break;
1.62 markus 2908: #ifdef WITH_XMSS
2909: case KEY_XMSS:
1.108 djm 2910: case KEY_XMSS_CERT:
1.62 markus 2911: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
2912: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
2913: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
1.110 markus 2914: goto out;
2915: if (type == KEY_XMSS &&
2916: (r = sshkey_xmss_init(k, xmss_name)) != 0)
1.62 markus 2917: goto out;
2918: if (pklen != sshkey_xmss_pklen(k) ||
2919: sklen != sshkey_xmss_sklen(k)) {
2920: r = SSH_ERR_INVALID_FORMAT;
2921: goto out;
2922: }
2923: k->xmss_pk = xmss_pk;
2924: k->xmss_sk = xmss_sk;
2925: xmss_pk = xmss_sk = NULL;
2926: /* optional internal state */
2927: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
2928: goto out;
2929: break;
2930: #endif /* WITH_XMSS */
1.1 djm 2931: default:
2932: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2933: goto out;
2934: }
2935: #ifdef WITH_OPENSSL
2936: /* enable blinding */
2937: switch (k->type) {
2938: case KEY_RSA:
2939: case KEY_RSA_CERT:
2940: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2941: r = SSH_ERR_LIBCRYPTO_ERROR;
2942: goto out;
2943: }
2944: break;
2945: }
2946: #endif /* WITH_OPENSSL */
1.115 djm 2947: if ((expect_sk_application != NULL && (k->sk_application == NULL ||
2948: strcmp(expect_sk_application, k->sk_application) != 0)) ||
2949: (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
1.116 djm 2950: memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
1.115 djm 2951: r = SSH_ERR_KEY_CERT_MISMATCH;
2952: goto out;
2953: }
1.1 djm 2954: /* success */
2955: r = 0;
2956: if (kp != NULL) {
2957: *kp = k;
2958: k = NULL;
2959: }
2960: out:
2961: free(tname);
2962: free(curve);
2963: #ifdef WITH_OPENSSL
1.60 jsing 2964: BN_clear_free(exponent);
1.69 djm 2965: BN_clear_free(dsa_p);
2966: BN_clear_free(dsa_q);
2967: BN_clear_free(dsa_g);
2968: BN_clear_free(dsa_pub_key);
2969: BN_clear_free(dsa_priv_key);
2970: BN_clear_free(rsa_n);
2971: BN_clear_free(rsa_e);
2972: BN_clear_free(rsa_d);
2973: BN_clear_free(rsa_p);
2974: BN_clear_free(rsa_q);
2975: BN_clear_free(rsa_iqmp);
1.1 djm 2976: #endif /* WITH_OPENSSL */
2977: sshkey_free(k);
1.61 jsing 2978: freezero(ed25519_pk, pklen);
2979: freezero(ed25519_sk, sklen);
1.62 markus 2980: free(xmss_name);
2981: freezero(xmss_pk, pklen);
2982: freezero(xmss_sk, sklen);
1.115 djm 2983: free(expect_sk_application);
2984: free(expect_ed25519_pk);
1.1 djm 2985: return r;
2986: }
2987:
2988: #ifdef WITH_OPENSSL
2989: int
2990: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2991: {
2992: EC_POINT *nq = NULL;
1.93 djm 2993: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 2994: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2995:
2996: /*
2997: * NB. This assumes OpenSSL has already verified that the public
2998: * point lies on the curve. This is done by EC_POINT_oct2point()
2999: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3000: * reachable with public points not unmarshalled using
3001: * EC_POINT_oct2point then the caller will need to explicitly check.
3002: */
1.1 djm 3003:
3004: /*
3005: * We shouldn't ever hit this case because bignum_get_ecpoint()
3006: * refuses to load GF2m points.
3007: */
3008: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3009: NID_X9_62_prime_field)
3010: goto out;
3011:
3012: /* Q != infinity */
3013: if (EC_POINT_is_at_infinity(group, public))
3014: goto out;
3015:
1.93 djm 3016: if ((x = BN_new()) == NULL ||
3017: (y = BN_new()) == NULL ||
3018: (order = BN_new()) == NULL ||
3019: (tmp = BN_new()) == NULL) {
1.1 djm 3020: ret = SSH_ERR_ALLOC_FAIL;
3021: goto out;
3022: }
3023:
3024: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 3025: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 3026: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 3027: x, y, NULL) != 1) {
1.1 djm 3028: ret = SSH_ERR_LIBCRYPTO_ERROR;
3029: goto out;
3030: }
3031: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3032: BN_num_bits(y) <= BN_num_bits(order) / 2)
3033: goto out;
3034:
3035: /* nQ == infinity (n == order of subgroup) */
3036: if ((nq = EC_POINT_new(group)) == NULL) {
3037: ret = SSH_ERR_ALLOC_FAIL;
3038: goto out;
3039: }
1.93 djm 3040: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 3041: ret = SSH_ERR_LIBCRYPTO_ERROR;
3042: goto out;
3043: }
3044: if (EC_POINT_is_at_infinity(group, nq) != 1)
3045: goto out;
3046:
3047: /* x < order - 1, y < order - 1 */
3048: if (!BN_sub(tmp, order, BN_value_one())) {
3049: ret = SSH_ERR_LIBCRYPTO_ERROR;
3050: goto out;
3051: }
3052: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3053: goto out;
3054: ret = 0;
3055: out:
1.93 djm 3056: BN_clear_free(x);
3057: BN_clear_free(y);
3058: BN_clear_free(order);
3059: BN_clear_free(tmp);
1.60 jsing 3060: EC_POINT_free(nq);
1.1 djm 3061: return ret;
3062: }
3063:
3064: int
3065: sshkey_ec_validate_private(const EC_KEY *key)
3066: {
1.93 djm 3067: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3068: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3069:
1.93 djm 3070: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3071: ret = SSH_ERR_ALLOC_FAIL;
3072: goto out;
3073: }
3074:
3075: /* log2(private) > log2(order)/2 */
1.93 djm 3076: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3077: ret = SSH_ERR_LIBCRYPTO_ERROR;
3078: goto out;
3079: }
3080: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3081: BN_num_bits(order) / 2)
3082: goto out;
3083:
3084: /* private < order - 1 */
3085: if (!BN_sub(tmp, order, BN_value_one())) {
3086: ret = SSH_ERR_LIBCRYPTO_ERROR;
3087: goto out;
3088: }
3089: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3090: goto out;
3091: ret = 0;
3092: out:
1.93 djm 3093: BN_clear_free(order);
3094: BN_clear_free(tmp);
1.1 djm 3095: return ret;
3096: }
3097:
3098: void
3099: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3100: {
1.93 djm 3101: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3102:
3103: if (point == NULL) {
3104: fputs("point=(NULL)\n", stderr);
3105: return;
3106: }
1.93 djm 3107: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3108: fprintf(stderr, "%s: BN_new failed\n", __func__);
3109: goto out;
1.1 djm 3110: }
3111: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3112: NID_X9_62_prime_field) {
3113: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3114: goto out;
1.1 djm 3115: }
1.93 djm 3116: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3117: x, y, NULL) != 1) {
1.1 djm 3118: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3119: __func__);
1.93 djm 3120: goto out;
1.1 djm 3121: }
3122: fputs("x=", stderr);
3123: BN_print_fp(stderr, x);
3124: fputs("\ny=", stderr);
3125: BN_print_fp(stderr, y);
3126: fputs("\n", stderr);
1.93 djm 3127: out:
3128: BN_clear_free(x);
3129: BN_clear_free(y);
1.1 djm 3130: }
3131:
3132: void
3133: sshkey_dump_ec_key(const EC_KEY *key)
3134: {
3135: const BIGNUM *exponent;
3136:
3137: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3138: EC_KEY_get0_public_key(key));
3139: fputs("exponent=", stderr);
3140: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3141: fputs("(NULL)", stderr);
3142: else
3143: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3144: fputs("\n", stderr);
3145: }
3146: #endif /* WITH_OPENSSL */
3147:
3148: static int
1.76 djm 3149: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3150: const char *passphrase, const char *comment, const char *ciphername,
3151: int rounds)
3152: {
1.4 djm 3153: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3154: u_char salt[SALT_LEN];
1.4 djm 3155: char *b64 = NULL;
1.1 djm 3156: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3157: u_int check;
3158: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3159: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3160: const struct sshcipher *cipher;
3161: const char *kdfname = KDFNAME;
3162: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3163:
3164: if (rounds <= 0)
3165: rounds = DEFAULT_ROUNDS;
3166: if (passphrase == NULL || !strlen(passphrase)) {
3167: ciphername = "none";
3168: kdfname = "none";
3169: } else if (ciphername == NULL)
3170: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3171: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3172: r = SSH_ERR_INVALID_ARGUMENT;
3173: goto out;
3174: }
3175:
3176: if ((kdf = sshbuf_new()) == NULL ||
3177: (encoded = sshbuf_new()) == NULL ||
3178: (encrypted = sshbuf_new()) == NULL) {
3179: r = SSH_ERR_ALLOC_FAIL;
3180: goto out;
3181: }
3182: blocksize = cipher_blocksize(cipher);
3183: keylen = cipher_keylen(cipher);
3184: ivlen = cipher_ivlen(cipher);
3185: authlen = cipher_authlen(cipher);
3186: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3187: r = SSH_ERR_ALLOC_FAIL;
3188: goto out;
3189: }
3190: if (strcmp(kdfname, "bcrypt") == 0) {
3191: arc4random_buf(salt, SALT_LEN);
3192: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3193: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3194: r = SSH_ERR_INVALID_ARGUMENT;
3195: goto out;
3196: }
3197: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3198: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3199: goto out;
3200: } else if (strcmp(kdfname, "none") != 0) {
3201: /* Unsupported KDF type */
3202: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3203: goto out;
3204: }
3205: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3206: key + keylen, ivlen, 1)) != 0)
3207: goto out;
3208:
3209: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3210: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3211: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3212: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3213: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3214: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3215: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3216: goto out;
3217:
3218: /* set up the buffer that will be encrypted */
3219:
3220: /* Random check bytes */
3221: check = arc4random();
3222: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3223: (r = sshbuf_put_u32(encrypted, check)) != 0)
3224: goto out;
3225:
3226: /* append private key and comment*/
1.62 markus 3227: if ((r = sshkey_private_serialize_opt(prv, encrypted,
1.116 djm 3228: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3229: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3230: goto out;
3231:
3232: /* padding */
3233: i = 0;
3234: while (sshbuf_len(encrypted) % blocksize) {
3235: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3236: goto out;
3237: }
3238:
3239: /* length in destination buffer */
3240: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3241: goto out;
3242:
3243: /* encrypt */
3244: if ((r = sshbuf_reserve(encoded,
3245: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3246: goto out;
1.36 djm 3247: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3248: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3249: goto out;
3250:
1.81 djm 3251: sshbuf_reset(blob);
1.1 djm 3252:
1.81 djm 3253: /* assemble uuencoded key */
3254: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3255: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3256: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3257: goto out;
3258:
3259: /* success */
3260: r = 0;
3261:
3262: out:
3263: sshbuf_free(kdf);
3264: sshbuf_free(encoded);
3265: sshbuf_free(encrypted);
1.36 djm 3266: cipher_free(ciphercontext);
1.1 djm 3267: explicit_bzero(salt, sizeof(salt));
1.100 jsg 3268: if (key != NULL)
3269: freezero(key, keylen + ivlen);
1.121 djm 3270: if (pubkeyblob != NULL)
1.100 jsg 3271: freezero(pubkeyblob, pubkeylen);
1.121 djm 3272: if (b64 != NULL)
1.100 jsg 3273: freezero(b64, strlen(b64));
1.1 djm 3274: return r;
3275: }
3276:
3277: static int
1.103 djm 3278: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 3279: {
3280: const u_char *cp;
3281: size_t encoded_len;
1.103 djm 3282: int r;
3283: u_char last;
1.1 djm 3284: struct sshbuf *encoded = NULL, *decoded = NULL;
3285:
1.103 djm 3286: if (blob == NULL || decodedp == NULL)
3287: return SSH_ERR_INVALID_ARGUMENT;
3288:
3289: *decodedp = NULL;
1.1 djm 3290:
3291: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 3292: (decoded = sshbuf_new()) == NULL) {
1.1 djm 3293: r = SSH_ERR_ALLOC_FAIL;
3294: goto out;
3295: }
3296:
3297: /* check preamble */
3298: cp = sshbuf_ptr(blob);
3299: encoded_len = sshbuf_len(blob);
3300: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3301: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3302: r = SSH_ERR_INVALID_FORMAT;
3303: goto out;
3304: }
3305: cp += MARK_BEGIN_LEN;
3306: encoded_len -= MARK_BEGIN_LEN;
3307:
3308: /* Look for end marker, removing whitespace as we go */
3309: while (encoded_len > 0) {
3310: if (*cp != '\n' && *cp != '\r') {
3311: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3312: goto out;
3313: }
3314: last = *cp;
3315: encoded_len--;
3316: cp++;
3317: if (last == '\n') {
3318: if (encoded_len >= MARK_END_LEN &&
3319: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3320: /* \0 terminate */
3321: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3322: goto out;
3323: break;
3324: }
3325: }
3326: }
3327: if (encoded_len == 0) {
3328: r = SSH_ERR_INVALID_FORMAT;
3329: goto out;
3330: }
3331:
3332: /* decode base64 */
1.4 djm 3333: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3334: goto out;
3335:
3336: /* check magic */
3337: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3338: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3339: r = SSH_ERR_INVALID_FORMAT;
3340: goto out;
3341: }
1.103 djm 3342: /* success */
3343: *decodedp = decoded;
3344: decoded = NULL;
3345: r = 0;
3346: out:
3347: sshbuf_free(encoded);
3348: sshbuf_free(decoded);
3349: return r;
3350: }
3351:
3352: static int
1.104 djm 3353: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
3354: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 3355: {
3356: char *ciphername = NULL, *kdfname = NULL;
3357: const struct sshcipher *cipher = NULL;
3358: int r = SSH_ERR_INTERNAL_ERROR;
3359: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3360: struct sshbuf *kdf = NULL, *decrypted = NULL;
3361: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 3362: struct sshkey *pubkey = NULL;
1.103 djm 3363: u_char *key = NULL, *salt = NULL, *dp;
3364: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3365:
1.104 djm 3366: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 3367: return SSH_ERR_INVALID_ARGUMENT;
3368:
3369: *decryptedp = NULL;
1.104 djm 3370: *pubkeyp = NULL;
1.103 djm 3371:
3372: if ((decrypted = sshbuf_new()) == NULL) {
3373: r = SSH_ERR_ALLOC_FAIL;
3374: goto out;
3375: }
3376:
1.1 djm 3377: /* parse public portion of key */
3378: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3379: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3380: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3381: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 3382: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3383: goto out;
3384:
3385: if (nkeys != 1) {
3386: /* XXX only one key supported at present */
3387: r = SSH_ERR_INVALID_FORMAT;
3388: goto out;
3389: }
3390:
1.104 djm 3391: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 3392: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3393: goto out;
3394:
3395: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3396: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3397: goto out;
3398: }
3399: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3400: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3401: goto out;
3402: }
1.101 markus 3403: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 3404: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 3405: goto out;
3406: }
3407: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3408: strcmp(kdfname, "none") != 0) {
3409: /* passphrase required */
3410: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 3411: goto out;
3412: }
3413:
3414: /* check size of encrypted key blob */
3415: blocksize = cipher_blocksize(cipher);
3416: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3417: r = SSH_ERR_INVALID_FORMAT;
3418: goto out;
3419: }
3420:
3421: /* setup key */
3422: keylen = cipher_keylen(cipher);
3423: ivlen = cipher_ivlen(cipher);
1.18 djm 3424: authlen = cipher_authlen(cipher);
1.1 djm 3425: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3426: r = SSH_ERR_ALLOC_FAIL;
3427: goto out;
3428: }
3429: if (strcmp(kdfname, "bcrypt") == 0) {
3430: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3431: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3432: goto out;
3433: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3434: key, keylen + ivlen, rounds) < 0) {
3435: r = SSH_ERR_INVALID_FORMAT;
3436: goto out;
3437: }
3438: }
3439:
1.18 djm 3440: /* check that an appropriate amount of auth data is present */
1.84 djm 3441: if (sshbuf_len(decoded) < authlen ||
3442: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 3443: r = SSH_ERR_INVALID_FORMAT;
3444: goto out;
3445: }
3446:
1.1 djm 3447: /* decrypt private portion of key */
3448: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3449: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3450: key + keylen, ivlen, 0)) != 0)
3451: goto out;
1.36 djm 3452: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3453: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3454: /* an integrity error here indicates an incorrect passphrase */
3455: if (r == SSH_ERR_MAC_INVALID)
3456: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3457: goto out;
3458: }
1.18 djm 3459: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3460: goto out;
3461: /* there should be no trailing data */
3462: if (sshbuf_len(decoded) != 0) {
3463: r = SSH_ERR_INVALID_FORMAT;
3464: goto out;
3465: }
3466:
3467: /* check check bytes */
3468: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3469: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3470: goto out;
3471: if (check1 != check2) {
3472: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3473: goto out;
3474: }
1.103 djm 3475: /* success */
3476: *decryptedp = decrypted;
3477: decrypted = NULL;
1.104 djm 3478: *pubkeyp = pubkey;
3479: pubkey = NULL;
1.103 djm 3480: r = 0;
3481: out:
3482: cipher_free(ciphercontext);
3483: free(ciphername);
3484: free(kdfname);
1.104 djm 3485: sshkey_free(pubkey);
1.103 djm 3486: if (salt != NULL) {
3487: explicit_bzero(salt, slen);
3488: free(salt);
3489: }
3490: if (key != NULL) {
3491: explicit_bzero(key, keylen + ivlen);
3492: free(key);
3493: }
3494: sshbuf_free(kdf);
3495: sshbuf_free(decrypted);
3496: return r;
3497: }
3498:
3499: static int
3500: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3501: struct sshkey **keyp, char **commentp)
3502: {
3503: char *comment = NULL;
3504: int r = SSH_ERR_INTERNAL_ERROR;
3505: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 3506: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 3507:
3508: if (keyp != NULL)
3509: *keyp = NULL;
3510: if (commentp != NULL)
3511: *commentp = NULL;
3512:
3513: /* Undo base64 encoding and decrypt the private section */
3514: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 3515: (r = private2_decrypt(decoded, passphrase,
3516: &decrypted, &pubkey)) != 0)
1.103 djm 3517: goto out;
1.105 djm 3518:
3519: if (type != KEY_UNSPEC &&
3520: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3521: r = SSH_ERR_KEY_TYPE_MISMATCH;
3522: goto out;
3523: }
1.103 djm 3524:
3525: /* Load the private key and comment */
3526: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3527: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3528: goto out;
3529:
3530: /* Check deterministic padding after private section */
3531: if ((r = private2_check_padding(decrypted)) != 0)
3532: goto out;
1.1 djm 3533:
1.104 djm 3534: /* Check that the public key in the envelope matches the private key */
3535: if (!sshkey_equal(pubkey, k)) {
3536: r = SSH_ERR_INVALID_FORMAT;
3537: goto out;
3538: }
1.1 djm 3539:
3540: /* success */
3541: r = 0;
3542: if (keyp != NULL) {
3543: *keyp = k;
3544: k = NULL;
3545: }
3546: if (commentp != NULL) {
3547: *commentp = comment;
3548: comment = NULL;
3549: }
3550: out:
3551: free(comment);
3552: sshbuf_free(decoded);
3553: sshbuf_free(decrypted);
3554: sshkey_free(k);
1.104 djm 3555: sshkey_free(pubkey);
1.1 djm 3556: return r;
3557: }
3558:
1.107 djm 3559: static int
3560: sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3561: struct sshkey **keyp)
3562: {
3563: int r = SSH_ERR_INTERNAL_ERROR;
3564: struct sshbuf *decoded = NULL;
3565: struct sshkey *pubkey = NULL;
3566: u_int nkeys = 0;
3567:
3568: if (keyp != NULL)
3569: *keyp = NULL;
3570:
3571: if ((r = private2_uudecode(blob, &decoded)) != 0)
3572: goto out;
3573: /* parse public key from unencrypted envelope */
3574: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3575: (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
3576: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
3577: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
3578: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3579: goto out;
3580:
3581: if (nkeys != 1) {
3582: /* XXX only one key supported at present */
3583: r = SSH_ERR_INVALID_FORMAT;
3584: goto out;
3585: }
3586:
3587: /* Parse the public key */
3588: if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3589: goto out;
3590:
3591: if (type != KEY_UNSPEC &&
3592: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3593: r = SSH_ERR_KEY_TYPE_MISMATCH;
3594: goto out;
3595: }
3596:
3597: /* success */
3598: r = 0;
3599: if (keyp != NULL) {
3600: *keyp = pubkey;
3601: pubkey = NULL;
3602: }
3603: out:
3604: sshbuf_free(decoded);
3605: sshkey_free(pubkey);
3606: return r;
3607: }
3608:
1.1 djm 3609: #ifdef WITH_OPENSSL
1.80 djm 3610: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3611: static int
1.80 djm 3612: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3613: int format, const char *_passphrase, const char *comment)
1.1 djm 3614: {
1.76 djm 3615: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3616: int success, r;
3617: int blen, len = strlen(_passphrase);
3618: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3619: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3620: char *bptr;
1.1 djm 3621: BIO *bio = NULL;
1.76 djm 3622: struct sshbuf *blob;
1.80 djm 3623: EVP_PKEY *pkey = NULL;
1.1 djm 3624:
3625: if (len > 0 && len <= 4)
3626: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3627: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3628: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3629: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3630: r = SSH_ERR_ALLOC_FAIL;
3631: goto out;
3632: }
3633: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3634: r = SSH_ERR_ALLOC_FAIL;
3635: goto out;
1.76 djm 3636: }
3637: if ((r = sshkey_unshield_private(key)) != 0)
3638: goto out;
1.1 djm 3639:
3640: switch (key->type) {
3641: case KEY_DSA:
1.80 djm 3642: if (format == SSHKEY_PRIVATE_PEM) {
3643: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3644: cipher, passphrase, len, NULL, NULL);
3645: } else {
3646: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3647: }
1.1 djm 3648: break;
3649: case KEY_ECDSA:
1.80 djm 3650: if (format == SSHKEY_PRIVATE_PEM) {
3651: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3652: cipher, passphrase, len, NULL, NULL);
3653: } else {
3654: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3655: }
1.1 djm 3656: break;
3657: case KEY_RSA:
1.80 djm 3658: if (format == SSHKEY_PRIVATE_PEM) {
3659: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3660: cipher, passphrase, len, NULL, NULL);
3661: } else {
3662: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3663: }
1.1 djm 3664: break;
3665: default:
3666: success = 0;
3667: break;
3668: }
3669: if (success == 0) {
3670: r = SSH_ERR_LIBCRYPTO_ERROR;
3671: goto out;
3672: }
1.80 djm 3673: if (format == SSHKEY_PRIVATE_PKCS8) {
3674: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3675: passphrase, len, NULL, NULL)) == 0) {
3676: r = SSH_ERR_LIBCRYPTO_ERROR;
3677: goto out;
3678: }
3679: }
1.1 djm 3680: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3681: r = SSH_ERR_INTERNAL_ERROR;
3682: goto out;
3683: }
3684: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3685: goto out;
3686: r = 0;
3687: out:
1.76 djm 3688: if (was_shielded)
3689: r = sshkey_shield_private(key);
3690: if (r == 0)
3691: r = sshbuf_putb(buf, blob);
1.80 djm 3692:
3693: EVP_PKEY_free(pkey);
1.76 djm 3694: sshbuf_free(blob);
1.1 djm 3695: BIO_free(bio);
3696: return r;
3697: }
3698: #endif /* WITH_OPENSSL */
3699:
3700: /* Serialise "key" to buffer "blob" */
3701: int
3702: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3703: const char *passphrase, const char *comment,
1.80 djm 3704: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 3705: {
3706: switch (key->type) {
1.9 markus 3707: #ifdef WITH_OPENSSL
1.1 djm 3708: case KEY_DSA:
3709: case KEY_ECDSA:
3710: case KEY_RSA:
1.80 djm 3711: break; /* see below */
1.1 djm 3712: #endif /* WITH_OPENSSL */
3713: case KEY_ED25519:
1.90 markus 3714: case KEY_ED25519_SK:
1.62 markus 3715: #ifdef WITH_XMSS
3716: case KEY_XMSS:
3717: #endif /* WITH_XMSS */
1.85 djm 3718: #ifdef WITH_OPENSSL
3719: case KEY_ECDSA_SK:
3720: #endif /* WITH_OPENSSL */
1.1 djm 3721: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 3722: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 3723: default:
3724: return SSH_ERR_KEY_TYPE_UNKNOWN;
3725: }
1.80 djm 3726:
3727: #ifdef WITH_OPENSSL
3728: switch (format) {
3729: case SSHKEY_PRIVATE_OPENSSH:
3730: return sshkey_private_to_blob2(key, blob, passphrase,
3731: comment, openssh_format_cipher, openssh_format_rounds);
3732: case SSHKEY_PRIVATE_PEM:
3733: case SSHKEY_PRIVATE_PKCS8:
3734: return sshkey_private_to_blob_pem_pkcs8(key, blob,
3735: format, passphrase, comment);
3736: default:
3737: return SSH_ERR_INVALID_ARGUMENT;
3738: }
3739: #endif /* WITH_OPENSSL */
1.1 djm 3740: }
3741:
3742: #ifdef WITH_OPENSSL
1.8 djm 3743: static int
1.52 djm 3744: translate_libcrypto_error(unsigned long pem_err)
3745: {
3746: int pem_reason = ERR_GET_REASON(pem_err);
3747:
3748: switch (ERR_GET_LIB(pem_err)) {
3749: case ERR_LIB_PEM:
3750: switch (pem_reason) {
3751: case PEM_R_BAD_PASSWORD_READ:
3752: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3753: case PEM_R_BAD_DECRYPT:
3754: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3755: default:
3756: return SSH_ERR_INVALID_FORMAT;
3757: }
3758: case ERR_LIB_EVP:
3759: switch (pem_reason) {
3760: case EVP_R_BAD_DECRYPT:
3761: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3762: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3763: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3764: #endif
1.52 djm 3765: case EVP_R_DECODE_ERROR:
3766: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3767: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3768: #endif
3769: return SSH_ERR_INVALID_FORMAT;
3770: default:
3771: return SSH_ERR_LIBCRYPTO_ERROR;
3772: }
3773: case ERR_LIB_ASN1:
3774: return SSH_ERR_INVALID_FORMAT;
3775: }
3776: return SSH_ERR_LIBCRYPTO_ERROR;
3777: }
3778:
3779: static void
3780: clear_libcrypto_errors(void)
3781: {
3782: while (ERR_get_error() != 0)
3783: ;
3784: }
3785:
3786: /*
3787: * Translate OpenSSL error codes to determine whether
3788: * passphrase is required/incorrect.
3789: */
3790: static int
3791: convert_libcrypto_error(void)
3792: {
3793: /*
3794: * Some password errors are reported at the beginning
3795: * of the error queue.
3796: */
3797: if (translate_libcrypto_error(ERR_peek_error()) ==
3798: SSH_ERR_KEY_WRONG_PASSPHRASE)
3799: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3800: return translate_libcrypto_error(ERR_peek_last_error());
3801: }
3802:
3803: static int
1.1 djm 3804: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3805: const char *passphrase, struct sshkey **keyp)
1.1 djm 3806: {
3807: EVP_PKEY *pk = NULL;
3808: struct sshkey *prv = NULL;
3809: BIO *bio = NULL;
3810: int r;
3811:
1.32 djm 3812: if (keyp != NULL)
3813: *keyp = NULL;
1.1 djm 3814:
3815: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3816: return SSH_ERR_ALLOC_FAIL;
3817: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3818: (int)sshbuf_len(blob)) {
3819: r = SSH_ERR_ALLOC_FAIL;
3820: goto out;
3821: }
3822:
1.52 djm 3823: clear_libcrypto_errors();
1.1 djm 3824: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3825: (char *)passphrase)) == NULL) {
1.116 djm 3826: /*
3827: * libcrypto may return various ASN.1 errors when attempting
3828: * to parse a key with an incorrect passphrase.
3829: * Treat all format errors as "incorrect passphrase" if a
3830: * passphrase was supplied.
3831: */
1.71 djm 3832: if (passphrase != NULL && *passphrase != '\0')
3833: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3834: else
3835: r = convert_libcrypto_error();
1.1 djm 3836: goto out;
3837: }
1.69 djm 3838: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3839: (type == KEY_UNSPEC || type == KEY_RSA)) {
3840: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3841: r = SSH_ERR_ALLOC_FAIL;
3842: goto out;
3843: }
3844: prv->rsa = EVP_PKEY_get1_RSA(pk);
3845: prv->type = KEY_RSA;
3846: #ifdef DEBUG_PK
3847: RSA_print_fp(stderr, prv->rsa, 8);
3848: #endif
3849: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3850: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3851: goto out;
3852: }
1.122 djm 3853: if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
1.1 djm 3854: goto out;
1.69 djm 3855: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3856: (type == KEY_UNSPEC || type == KEY_DSA)) {
3857: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3858: r = SSH_ERR_ALLOC_FAIL;
3859: goto out;
3860: }
3861: prv->dsa = EVP_PKEY_get1_DSA(pk);
3862: prv->type = KEY_DSA;
3863: #ifdef DEBUG_PK
3864: DSA_print_fp(stderr, prv->dsa, 8);
3865: #endif
1.69 djm 3866: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3867: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3868: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3869: r = SSH_ERR_ALLOC_FAIL;
3870: goto out;
3871: }
3872: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3873: prv->type = KEY_ECDSA;
3874: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3875: if (prv->ecdsa_nid == -1 ||
3876: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3877: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3878: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3879: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3880: r = SSH_ERR_INVALID_FORMAT;
3881: goto out;
3882: }
3883: #ifdef DEBUG_PK
3884: if (prv != NULL && prv->ecdsa != NULL)
3885: sshkey_dump_ec_key(prv->ecdsa);
3886: #endif
3887: } else {
3888: r = SSH_ERR_INVALID_FORMAT;
3889: goto out;
3890: }
3891: r = 0;
1.32 djm 3892: if (keyp != NULL) {
3893: *keyp = prv;
3894: prv = NULL;
3895: }
1.1 djm 3896: out:
3897: BIO_free(bio);
1.60 jsing 3898: EVP_PKEY_free(pk);
1.30 mmcc 3899: sshkey_free(prv);
1.1 djm 3900: return r;
3901: }
3902: #endif /* WITH_OPENSSL */
3903:
3904: int
3905: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3906: const char *passphrase, struct sshkey **keyp, char **commentp)
3907: {
1.42 djm 3908: int r = SSH_ERR_INTERNAL_ERROR;
3909:
1.32 djm 3910: if (keyp != NULL)
3911: *keyp = NULL;
1.1 djm 3912: if (commentp != NULL)
3913: *commentp = NULL;
3914:
3915: switch (type) {
3916: case KEY_ED25519:
1.62 markus 3917: case KEY_XMSS:
1.106 djm 3918: /* No fallback for new-format-only keys */
1.1 djm 3919: return sshkey_parse_private2(blob, type, passphrase,
3920: keyp, commentp);
1.106 djm 3921: default:
1.42 djm 3922: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3923: commentp);
1.106 djm 3924: /* Only fallback to PEM parser if a format error occurred. */
3925: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 3926: return r;
1.1 djm 3927: #ifdef WITH_OPENSSL
1.8 djm 3928: return sshkey_parse_private_pem_fileblob(blob, type,
3929: passphrase, keyp);
1.1 djm 3930: #else
3931: return SSH_ERR_INVALID_FORMAT;
3932: #endif /* WITH_OPENSSL */
3933: }
3934: }
3935:
3936: int
3937: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3938: struct sshkey **keyp, char **commentp)
1.1 djm 3939: {
3940: if (keyp != NULL)
3941: *keyp = NULL;
3942: if (commentp != NULL)
3943: *commentp = NULL;
3944:
1.23 tim 3945: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3946: passphrase, keyp, commentp);
1.96 djm 3947: }
3948:
3949: void
3950: sshkey_sig_details_free(struct sshkey_sig_details *details)
3951: {
3952: freezero(details, sizeof(*details));
1.107 djm 3953: }
3954:
3955: int
3956: sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
3957: struct sshkey **pubkeyp)
3958: {
3959: int r = SSH_ERR_INTERNAL_ERROR;
3960:
3961: if (pubkeyp != NULL)
3962: *pubkeyp = NULL;
3963: /* only new-format private keys bundle a public key inside */
3964: if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
3965: return r;
3966: return 0;
1.1 djm 3967: }
1.62 markus 3968:
3969: #ifdef WITH_XMSS
3970: /*
3971: * serialize the key with the current state and forward the state
3972: * maxsign times.
3973: */
3974: int
1.77 djm 3975: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3976: u_int32_t maxsign, int printerror)
1.62 markus 3977: {
3978: int r, rupdate;
3979:
3980: if (maxsign == 0 ||
3981: sshkey_type_plain(k->type) != KEY_XMSS)
3982: return sshkey_private_serialize_opt(k, b,
3983: SSHKEY_SERIALIZE_DEFAULT);
1.112 dtucker 3984: if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
1.62 markus 3985: (r = sshkey_private_serialize_opt(k, b,
3986: SSHKEY_SERIALIZE_STATE)) != 0 ||
3987: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3988: goto out;
3989: r = 0;
3990: out:
1.112 dtucker 3991: if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
1.62 markus 3992: if (r == 0)
3993: r = rupdate;
3994: }
3995: return r;
3996: }
3997:
3998: u_int32_t
3999: sshkey_signatures_left(const struct sshkey *k)
4000: {
4001: if (sshkey_type_plain(k->type) == KEY_XMSS)
4002: return sshkey_xmss_signatures_left(k);
4003: return 0;
4004: }
4005:
4006: int
4007: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4008: {
4009: if (sshkey_type_plain(k->type) != KEY_XMSS)
4010: return SSH_ERR_INVALID_ARGUMENT;
4011: return sshkey_xmss_enable_maxsign(k, maxsign);
4012: }
4013:
4014: int
4015: sshkey_set_filename(struct sshkey *k, const char *filename)
4016: {
4017: if (k == NULL)
4018: return SSH_ERR_INVALID_ARGUMENT;
4019: if (sshkey_type_plain(k->type) != KEY_XMSS)
4020: return 0;
4021: if (filename == NULL)
4022: return SSH_ERR_INVALID_ARGUMENT;
4023: if ((k->xmss_filename = strdup(filename)) == NULL)
4024: return SSH_ERR_ALLOC_FAIL;
4025: return 0;
4026: }
4027: #else
4028: int
1.76 djm 4029: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 4030: u_int32_t maxsign, int printerror)
1.62 markus 4031: {
4032: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4033: }
4034:
4035: u_int32_t
4036: sshkey_signatures_left(const struct sshkey *k)
4037: {
4038: return 0;
4039: }
4040:
4041: int
4042: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4043: {
4044: return SSH_ERR_INVALID_ARGUMENT;
4045: }
4046:
4047: int
4048: sshkey_set_filename(struct sshkey *k, const char *filename)
4049: {
4050: if (k == NULL)
4051: return SSH_ERR_INVALID_ARGUMENT;
4052: return 0;
4053: }
4054: #endif /* WITH_XMSS */
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