Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.128
1.128 ! djm 1: /* $OpenBSD: sshkey.c,v 1.127 2022/10/28 00:39:29 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);
707: return impl->funcs->serialize_public(key, b, typename, opts);
1.1 djm 708: }
709:
710: int
1.14 djm 711: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 712: {
1.62 markus 713: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 714: }
715:
716: int
1.62 markus 717: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
718: enum sshkey_serialize_rep opts)
1.14 djm 719: {
720: struct sshbuf *tmp;
721: int r;
722:
723: if ((tmp = sshbuf_new()) == NULL)
724: return SSH_ERR_ALLOC_FAIL;
1.62 markus 725: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 726: if (r == 0)
727: r = sshbuf_put_stringb(b, tmp);
728: sshbuf_free(tmp);
729: return r;
730: }
731:
732: int
1.62 markus 733: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
734: {
735: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
736: }
737:
738: int
1.14 djm 739: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 740: {
1.62 markus 741: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 742: }
743:
744: static int
1.62 markus 745: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
746: enum sshkey_serialize_rep opts)
1.1 djm 747: {
748: int ret = SSH_ERR_INTERNAL_ERROR;
749: size_t len;
750: struct sshbuf *b = NULL;
751:
752: if (lenp != NULL)
753: *lenp = 0;
754: if (blobp != NULL)
755: *blobp = NULL;
756: if ((b = sshbuf_new()) == NULL)
757: return SSH_ERR_ALLOC_FAIL;
1.62 markus 758: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 759: goto out;
760: len = sshbuf_len(b);
761: if (lenp != NULL)
762: *lenp = len;
763: if (blobp != NULL) {
764: if ((*blobp = malloc(len)) == NULL) {
765: ret = SSH_ERR_ALLOC_FAIL;
766: goto out;
767: }
768: memcpy(*blobp, sshbuf_ptr(b), len);
769: }
770: ret = 0;
771: out:
772: sshbuf_free(b);
773: return ret;
774: }
775:
776: int
777: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
778: {
1.62 markus 779: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 780: }
781:
782: int
783: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
784: {
1.62 markus 785: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 786: }
787:
788: int
1.7 djm 789: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 790: u_char **retp, size_t *lenp)
791: {
792: u_char *blob = NULL, *ret = NULL;
793: size_t blob_len = 0;
1.7 djm 794: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 795:
796: if (retp != NULL)
797: *retp = NULL;
798: if (lenp != NULL)
799: *lenp = 0;
1.7 djm 800: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 801: r = SSH_ERR_INVALID_ARGUMENT;
802: goto out;
803: }
1.62 markus 804: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
805: != 0)
1.1 djm 806: goto out;
807: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
808: r = SSH_ERR_ALLOC_FAIL;
809: goto out;
810: }
1.7 djm 811: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 812: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
813: goto out;
814: /* success */
815: if (retp != NULL) {
816: *retp = ret;
817: ret = NULL;
818: }
819: if (lenp != NULL)
1.7 djm 820: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 821: r = 0;
822: out:
823: free(ret);
1.100 jsg 824: if (blob != NULL)
825: freezero(blob, blob_len);
1.1 djm 826: return r;
827: }
828:
829: static char *
1.7 djm 830: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
831: {
832: char *ret;
833: size_t plen = strlen(alg) + 1;
834: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
835:
836: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
837: return NULL;
838: strlcpy(ret, alg, rlen);
839: strlcat(ret, ":", rlen);
840: if (dgst_raw_len == 0)
841: return ret;
1.79 dtucker 842: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 843: freezero(ret, rlen);
1.7 djm 844: return NULL;
845: }
846: /* Trim padding characters from end */
847: ret[strcspn(ret, "=")] = '\0';
848: return ret;
849: }
850:
851: static char *
852: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 853: {
1.7 djm 854: char *retval, hex[5];
855: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 856:
1.7 djm 857: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 858: return NULL;
1.7 djm 859: strlcpy(retval, alg, rlen);
860: strlcat(retval, ":", rlen);
1.1 djm 861: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 862: snprintf(hex, sizeof(hex), "%s%02x",
863: i > 0 ? ":" : "", dgst_raw[i]);
864: strlcat(retval, hex, rlen);
1.1 djm 865: }
866: return retval;
867: }
868:
869: static char *
870: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
871: {
872: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
873: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
874: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
875: u_int i, j = 0, rounds, seed = 1;
876: char *retval;
877:
878: rounds = (dgst_raw_len / 2) + 1;
879: if ((retval = calloc(rounds, 6)) == NULL)
880: return NULL;
881: retval[j++] = 'x';
882: for (i = 0; i < rounds; i++) {
883: u_int idx0, idx1, idx2, idx3, idx4;
884: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
885: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
886: seed) % 6;
887: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
888: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
889: (seed / 6)) % 6;
890: retval[j++] = vowels[idx0];
891: retval[j++] = consonants[idx1];
892: retval[j++] = vowels[idx2];
893: if ((i + 1) < rounds) {
894: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
895: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
896: retval[j++] = consonants[idx3];
897: retval[j++] = '-';
898: retval[j++] = consonants[idx4];
899: seed = ((seed * 5) +
900: ((((u_int)(dgst_raw[2 * i])) * 7) +
901: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
902: }
903: } else {
904: idx0 = seed % 6;
905: idx1 = 16;
906: idx2 = seed / 6;
907: retval[j++] = vowels[idx0];
908: retval[j++] = consonants[idx1];
909: retval[j++] = vowels[idx2];
910: }
911: }
912: retval[j++] = 'x';
913: retval[j++] = '\0';
914: return retval;
915: }
916:
917: /*
918: * Draw an ASCII-Art representing the fingerprint so human brain can
919: * profit from its built-in pattern recognition ability.
920: * This technique is called "random art" and can be found in some
921: * scientific publications like this original paper:
922: *
923: * "Hash Visualization: a New Technique to improve Real-World Security",
924: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
925: * Techniques and E-Commerce (CrypTEC '99)
926: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
927: *
928: * The subject came up in a talk by Dan Kaminsky, too.
929: *
930: * If you see the picture is different, the key is different.
931: * If the picture looks the same, you still know nothing.
932: *
933: * The algorithm used here is a worm crawling over a discrete plane,
934: * leaving a trace (augmenting the field) everywhere it goes.
935: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
936: * makes the respective movement vector be ignored for this turn.
937: * Graphs are not unambiguous, because circles in graphs can be
938: * walked in either direction.
939: */
940:
941: /*
942: * Field sizes for the random art. Have to be odd, so the starting point
943: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
944: * Else pictures would be too dense, and drawing the frame would
945: * fail, too, because the key type would not fit in anymore.
946: */
947: #define FLDBASE 8
948: #define FLDSIZE_Y (FLDBASE + 1)
949: #define FLDSIZE_X (FLDBASE * 2 + 1)
950: static char *
1.7 djm 951: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 952: const struct sshkey *k)
953: {
954: /*
955: * Chars to be used after each other every time the worm
956: * intersects with itself. Matter of taste.
957: */
958: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 959: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 960: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 961: size_t i, tlen, hlen;
1.1 djm 962: u_int b;
1.3 djm 963: int x, y, r;
1.1 djm 964: size_t len = strlen(augmentation_string) - 1;
965:
966: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
967: return NULL;
968:
969: /* initialize field */
970: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
971: x = FLDSIZE_X / 2;
972: y = FLDSIZE_Y / 2;
973:
974: /* process raw key */
975: for (i = 0; i < dgst_raw_len; i++) {
976: int input;
977: /* each byte conveys four 2-bit move commands */
978: input = dgst_raw[i];
979: for (b = 0; b < 4; b++) {
980: /* evaluate 2 bit, rest is shifted later */
981: x += (input & 0x1) ? 1 : -1;
982: y += (input & 0x2) ? 1 : -1;
983:
984: /* assure we are still in bounds */
1.37 deraadt 985: x = MAXIMUM(x, 0);
986: y = MAXIMUM(y, 0);
987: x = MINIMUM(x, FLDSIZE_X - 1);
988: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 989:
990: /* augment the field */
991: if (field[x][y] < len - 2)
992: field[x][y]++;
993: input = input >> 2;
994: }
995: }
996:
997: /* mark starting point and end point*/
998: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
999: field[x][y] = len;
1000:
1.3 djm 1001: /* assemble title */
1002: r = snprintf(title, sizeof(title), "[%s %u]",
1003: sshkey_type(k), sshkey_size(k));
1004: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1005: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1006: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1007: tlen = (r <= 0) ? 0 : strlen(title);
1008:
1009: /* assemble hash ID. */
1010: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1011: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1012:
1013: /* output upper border */
1.3 djm 1014: p = retval;
1015: *p++ = '+';
1016: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1017: *p++ = '-';
1018: memcpy(p, title, tlen);
1019: p += tlen;
1.7 djm 1020: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1021: *p++ = '-';
1022: *p++ = '+';
1023: *p++ = '\n';
1024:
1025: /* output content */
1026: for (y = 0; y < FLDSIZE_Y; y++) {
1027: *p++ = '|';
1028: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1029: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1030: *p++ = '|';
1031: *p++ = '\n';
1032: }
1033:
1034: /* output lower border */
1035: *p++ = '+';
1.7 djm 1036: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1037: *p++ = '-';
1038: memcpy(p, hash, hlen);
1039: p += hlen;
1040: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1041: *p++ = '-';
1042: *p++ = '+';
1043:
1044: return retval;
1045: }
1046:
1047: char *
1.7 djm 1048: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1049: enum sshkey_fp_rep dgst_rep)
1050: {
1051: char *retval = NULL;
1052: u_char *dgst_raw;
1053: size_t dgst_raw_len;
1054:
1.7 djm 1055: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1056: return NULL;
1057: switch (dgst_rep) {
1.7 djm 1058: case SSH_FP_DEFAULT:
1059: if (dgst_alg == SSH_DIGEST_MD5) {
1060: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1061: dgst_raw, dgst_raw_len);
1062: } else {
1063: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1064: dgst_raw, dgst_raw_len);
1065: }
1066: break;
1.1 djm 1067: case SSH_FP_HEX:
1.7 djm 1068: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1069: dgst_raw, dgst_raw_len);
1070: break;
1071: case SSH_FP_BASE64:
1072: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1073: dgst_raw, dgst_raw_len);
1.1 djm 1074: break;
1075: case SSH_FP_BUBBLEBABBLE:
1076: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1077: break;
1078: case SSH_FP_RANDOMART:
1.7 djm 1079: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1080: dgst_raw, dgst_raw_len, k);
1.1 djm 1081: break;
1082: default:
1.100 jsg 1083: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1084: return NULL;
1085: }
1.100 jsg 1086: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1087: return retval;
1088: }
1089:
1.63 djm 1090: static int
1091: peek_type_nid(const char *s, size_t l, int *nid)
1092: {
1.123 djm 1093: const struct sshkey_impl *impl;
1094: int i;
1.63 djm 1095:
1.123 djm 1096: for (i = 0; keyimpls[i] != NULL; i++) {
1097: impl = keyimpls[i];
1098: if (impl->name == NULL || strlen(impl->name) != l)
1.63 djm 1099: continue;
1.123 djm 1100: if (memcmp(s, impl->name, l) == 0) {
1.63 djm 1101: *nid = -1;
1.123 djm 1102: if (key_type_is_ecdsa_variant(impl->type))
1103: *nid = impl->nid;
1104: return impl->type;
1.63 djm 1105: }
1106: }
1107: return KEY_UNSPEC;
1108: }
1.1 djm 1109:
1.63 djm 1110: /* XXX this can now be made const char * */
1.1 djm 1111: int
1112: sshkey_read(struct sshkey *ret, char **cpp)
1113: {
1114: struct sshkey *k;
1.63 djm 1115: char *cp, *blobcopy;
1116: size_t space;
1.1 djm 1117: int r, type, curve_nid = -1;
1118: struct sshbuf *blob;
1.44 dtucker 1119:
1120: if (ret == NULL)
1121: return SSH_ERR_INVALID_ARGUMENT;
1.126 djm 1122: if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL)
1.63 djm 1123: return SSH_ERR_INVALID_ARGUMENT;
1124:
1125: /* Decode type */
1126: cp = *cpp;
1127: space = strcspn(cp, " \t");
1128: if (space == strlen(cp))
1129: return SSH_ERR_INVALID_FORMAT;
1130: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1131: return SSH_ERR_INVALID_FORMAT;
1132:
1133: /* skip whitespace */
1134: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1135: ;
1136: if (*cp == '\0')
1137: return SSH_ERR_INVALID_FORMAT;
1138: if (ret->type != KEY_UNSPEC && ret->type != type)
1139: return SSH_ERR_KEY_TYPE_MISMATCH;
1140: if ((blob = sshbuf_new()) == NULL)
1141: return SSH_ERR_ALLOC_FAIL;
1142:
1143: /* find end of keyblob and decode */
1144: space = strcspn(cp, " \t");
1145: if ((blobcopy = strndup(cp, space)) == NULL) {
1146: sshbuf_free(blob);
1147: return SSH_ERR_ALLOC_FAIL;
1148: }
1149: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1150: free(blobcopy);
1151: sshbuf_free(blob);
1152: return r;
1153: }
1154: free(blobcopy);
1155: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1156: sshbuf_free(blob);
1.63 djm 1157: return r;
1158: }
1159: sshbuf_free(blob);
1160:
1161: /* skip whitespace and leave cp at start of comment */
1162: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1163: ;
1164:
1165: /* ensure type of blob matches type at start of line */
1166: if (k->type != type) {
1167: sshkey_free(k);
1168: return SSH_ERR_KEY_TYPE_MISMATCH;
1169: }
1.85 djm 1170: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1171: sshkey_free(k);
1172: return SSH_ERR_EC_CURVE_MISMATCH;
1173: }
1174:
1175: /* Fill in ret from parsed key */
1.126 djm 1176: sshkey_free_contents(ret);
1177: *ret = *k;
1178: freezero(k, sizeof(*k));
1.63 djm 1179:
1180: /* success */
1181: *cpp = cp;
1182: return 0;
1.1 djm 1183: }
1184:
1185: int
1.19 djm 1186: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1187: {
1.19 djm 1188: int r = SSH_ERR_INTERNAL_ERROR;
1189: struct sshbuf *b = NULL;
1.1 djm 1190: char *uu = NULL;
1.19 djm 1191:
1192: if (b64p != NULL)
1193: *b64p = NULL;
1194: if ((b = sshbuf_new()) == NULL)
1195: return SSH_ERR_ALLOC_FAIL;
1196: if ((r = sshkey_putb(key, b)) != 0)
1197: goto out;
1.81 djm 1198: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1199: r = SSH_ERR_ALLOC_FAIL;
1200: goto out;
1201: }
1202: /* Success */
1203: if (b64p != NULL) {
1204: *b64p = uu;
1205: uu = NULL;
1206: }
1207: r = 0;
1208: out:
1209: sshbuf_free(b);
1210: free(uu);
1211: return r;
1212: }
1213:
1.52 djm 1214: int
1.19 djm 1215: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1216: {
1217: int r = SSH_ERR_INTERNAL_ERROR;
1218: char *uu = NULL;
1219:
1.48 djm 1220: if ((r = sshkey_to_base64(key, &uu)) != 0)
1221: goto out;
1222: if ((r = sshbuf_putf(b, "%s %s",
1223: sshkey_ssh_name(key), uu)) != 0)
1224: goto out;
1.19 djm 1225: r = 0;
1226: out:
1227: free(uu);
1228: return r;
1229: }
1230:
1231: int
1232: sshkey_write(const struct sshkey *key, FILE *f)
1233: {
1234: struct sshbuf *b = NULL;
1235: int r = SSH_ERR_INTERNAL_ERROR;
1236:
1237: if ((b = sshbuf_new()) == NULL)
1238: return SSH_ERR_ALLOC_FAIL;
1239: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1240: goto out;
1241: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1242: if (feof(f))
1243: errno = EPIPE;
1.19 djm 1244: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1245: goto out;
1246: }
1.19 djm 1247: /* Success */
1248: r = 0;
1.1 djm 1249: out:
1.19 djm 1250: sshbuf_free(b);
1251: return r;
1.1 djm 1252: }
1253:
1254: const char *
1255: sshkey_cert_type(const struct sshkey *k)
1256: {
1257: switch (k->cert->type) {
1258: case SSH2_CERT_TYPE_USER:
1259: return "user";
1260: case SSH2_CERT_TYPE_HOST:
1261: return "host";
1262: default:
1263: return "unknown";
1264: }
1265: }
1266:
1267: #ifdef WITH_OPENSSL
1268: int
1269: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1270: {
1271: EC_GROUP *eg;
1272: int nids[] = {
1273: NID_X9_62_prime256v1,
1274: NID_secp384r1,
1275: NID_secp521r1,
1276: -1
1277: };
1278: int nid;
1279: u_int i;
1280: const EC_GROUP *g = EC_KEY_get0_group(k);
1281:
1282: /*
1283: * The group may be stored in a ASN.1 encoded private key in one of two
1284: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1285: * or explicit group parameters encoded into the key blob. Only the
1286: * "named group" case sets the group NID for us, but we can figure
1287: * it out for the other case by comparing against all the groups that
1288: * are supported.
1289: */
1290: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1291: return nid;
1292: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1293: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1294: return -1;
1.93 djm 1295: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1296: break;
1297: EC_GROUP_free(eg);
1298: }
1299: if (nids[i] != -1) {
1300: /* Use the group with the NID attached */
1301: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1302: if (EC_KEY_set_group(k, eg) != 1) {
1303: EC_GROUP_free(eg);
1304: return -1;
1305: }
1306: }
1307: return nids[i];
1308: }
1309:
1310: #endif /* WITH_OPENSSL */
1311:
1312: int
1313: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1314: {
1315: struct sshkey *k;
1316: int ret = SSH_ERR_INTERNAL_ERROR;
1.127 djm 1317: const struct sshkey_impl *impl;
1.1 djm 1318:
1.127 djm 1319: if (keyp == NULL || sshkey_type_is_cert(type))
1.1 djm 1320: return SSH_ERR_INVALID_ARGUMENT;
1321: *keyp = NULL;
1.127 djm 1322: if ((impl = sshkey_impl_from_type(type)) == NULL)
1323: return SSH_ERR_KEY_TYPE_UNKNOWN;
1324: if (impl->funcs->generate == NULL)
1325: return SSH_ERR_FEATURE_UNSUPPORTED;
1.1 djm 1326: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1327: return SSH_ERR_ALLOC_FAIL;
1.127 djm 1328: k->type = type;
1329: if ((ret = impl->funcs->generate(k, bits)) != 0) {
1330: sshkey_free(k);
1331: return ret;
1.1 djm 1332: }
1.127 djm 1333: /* success */
1334: *keyp = k;
1335: return 0;
1.1 djm 1336: }
1337:
1338: int
1339: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1340: {
1341: u_int i;
1342: const struct sshkey_cert *from;
1343: struct sshkey_cert *to;
1.67 djm 1344: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1345:
1.67 djm 1346: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1347: return SSH_ERR_INVALID_ARGUMENT;
1348:
1.67 djm 1349: if ((to = cert_new()) == NULL)
1.1 djm 1350: return SSH_ERR_ALLOC_FAIL;
1351:
1.67 djm 1352: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1353: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1354: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1355: goto out;
1.1 djm 1356:
1357: to->serial = from->serial;
1358: to->type = from->type;
1359: if (from->key_id == NULL)
1360: to->key_id = NULL;
1.67 djm 1361: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1362: r = SSH_ERR_ALLOC_FAIL;
1363: goto out;
1364: }
1.1 djm 1365: to->valid_after = from->valid_after;
1366: to->valid_before = from->valid_before;
1367: if (from->signature_key == NULL)
1368: to->signature_key = NULL;
1.67 djm 1369: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1370: &to->signature_key)) != 0)
1.67 djm 1371: goto out;
1372: if (from->signature_type != NULL &&
1373: (to->signature_type = strdup(from->signature_type)) == NULL) {
1374: r = SSH_ERR_ALLOC_FAIL;
1375: goto out;
1376: }
1377: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1378: r = SSH_ERR_INVALID_ARGUMENT;
1379: goto out;
1380: }
1.1 djm 1381: if (from->nprincipals > 0) {
1382: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1383: sizeof(*to->principals))) == NULL) {
1384: r = SSH_ERR_ALLOC_FAIL;
1385: goto out;
1386: }
1.1 djm 1387: for (i = 0; i < from->nprincipals; i++) {
1388: to->principals[i] = strdup(from->principals[i]);
1389: if (to->principals[i] == NULL) {
1390: to->nprincipals = i;
1.67 djm 1391: r = SSH_ERR_ALLOC_FAIL;
1392: goto out;
1.1 djm 1393: }
1394: }
1395: }
1396: to->nprincipals = from->nprincipals;
1.67 djm 1397:
1398: /* success */
1399: cert_free(to_key->cert);
1400: to_key->cert = to;
1401: to = NULL;
1402: r = 0;
1403: out:
1404: cert_free(to);
1405: return r;
1.1 djm 1406: }
1407:
1408: int
1.128 ! djm 1409: sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to)
! 1410: {
! 1411: /* Append security-key application string */
! 1412: if ((to->sk_application = strdup(from->sk_application)) == NULL)
! 1413: return SSH_ERR_ALLOC_FAIL;
! 1414: return 0;
! 1415: }
! 1416:
! 1417: int
1.1 djm 1418: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1419: {
1420: struct sshkey *n = NULL;
1.69 djm 1421: int r = SSH_ERR_INTERNAL_ERROR;
1.128 ! djm 1422: const struct sshkey_impl *impl;
1.1 djm 1423:
1.24 djm 1424: *pkp = NULL;
1.128 ! djm 1425: if ((impl = sshkey_impl_from_key(k)) == NULL)
! 1426: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.85 djm 1427: if ((n = sshkey_new(k->type)) == NULL) {
1428: r = SSH_ERR_ALLOC_FAIL;
1429: goto out;
1430: }
1.128 ! djm 1431: if ((r = impl->funcs->copy_public(k, n)) != 0)
1.69 djm 1432: goto out;
1433: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1434: goto out;
1435: /* success */
1.1 djm 1436: *pkp = n;
1.69 djm 1437: n = NULL;
1438: r = 0;
1439: out:
1440: sshkey_free(n);
1441: return r;
1.1 djm 1442: }
1443:
1.76 djm 1444: int
1445: sshkey_is_shielded(struct sshkey *k)
1446: {
1447: return k != NULL && k->shielded_private != NULL;
1448: }
1449:
1450: int
1451: sshkey_shield_private(struct sshkey *k)
1452: {
1453: struct sshbuf *prvbuf = NULL;
1454: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1455: struct sshcipher_ctx *cctx = NULL;
1456: const struct sshcipher *cipher;
1457: size_t i, enclen = 0;
1458: struct sshkey *kswap = NULL, tmp;
1459: int r = SSH_ERR_INTERNAL_ERROR;
1460:
1461: #ifdef DEBUG_PK
1462: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1463: #endif
1464: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1465: r = SSH_ERR_INVALID_ARGUMENT;
1466: goto out;
1467: }
1468: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1469: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1470: r = SSH_ERR_INTERNAL_ERROR;
1471: goto out;
1472: }
1473:
1474: /* Prepare a random pre-key, and from it an ephemeral key */
1475: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1476: r = SSH_ERR_ALLOC_FAIL;
1477: goto out;
1478: }
1479: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1480: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1481: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1482: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1483: goto out;
1484: #ifdef DEBUG_PK
1485: fprintf(stderr, "%s: key+iv\n", __func__);
1486: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1487: stderr);
1488: #endif
1489: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1490: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1491: goto out;
1492:
1493: /* Serialise and encrypt the private key using the ephemeral key */
1494: if ((prvbuf = sshbuf_new()) == NULL) {
1495: r = SSH_ERR_ALLOC_FAIL;
1496: goto out;
1497: }
1498: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1499: goto out;
1500: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.116 djm 1501: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 1502: goto out;
1503: /* pad to cipher blocksize */
1504: i = 0;
1505: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1506: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1507: goto out;
1508: }
1509: #ifdef DEBUG_PK
1510: fprintf(stderr, "%s: serialised\n", __func__);
1511: sshbuf_dump(prvbuf, stderr);
1512: #endif
1513: /* encrypt */
1514: enclen = sshbuf_len(prvbuf);
1515: if ((enc = malloc(enclen)) == NULL) {
1516: r = SSH_ERR_ALLOC_FAIL;
1517: goto out;
1518: }
1519: if ((r = cipher_crypt(cctx, 0, enc,
1520: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1521: goto out;
1522: #ifdef DEBUG_PK
1523: fprintf(stderr, "%s: encrypted\n", __func__);
1524: sshbuf_dump_data(enc, enclen, stderr);
1525: #endif
1526:
1527: /* Make a scrubbed, public-only copy of our private key argument */
1528: if ((r = sshkey_from_private(k, &kswap)) != 0)
1529: goto out;
1530:
1531: /* Swap the private key out (it will be destroyed below) */
1532: tmp = *kswap;
1533: *kswap = *k;
1534: *k = tmp;
1535:
1536: /* Insert the shielded key into our argument */
1537: k->shielded_private = enc;
1538: k->shielded_len = enclen;
1539: k->shield_prekey = prekey;
1540: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1541: enc = prekey = NULL; /* transferred */
1542: enclen = 0;
1.99 djm 1543:
1544: /* preserve key fields that are required for correct operation */
1545: k->sk_flags = kswap->sk_flags;
1.76 djm 1546:
1547: /* success */
1548: r = 0;
1549:
1550: out:
1551: /* XXX behaviour on error - invalidate original private key? */
1552: cipher_free(cctx);
1553: explicit_bzero(keyiv, sizeof(keyiv));
1554: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1555: freezero(enc, enclen);
1.76 djm 1556: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1557: sshkey_free(kswap);
1558: sshbuf_free(prvbuf);
1559: return r;
1560: }
1561:
1.121 djm 1562: /* Check deterministic padding after private key */
1563: static int
1564: private2_check_padding(struct sshbuf *decrypted)
1565: {
1566: u_char pad;
1567: size_t i;
1568: int r;
1569:
1570: i = 0;
1571: while (sshbuf_len(decrypted)) {
1572: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1573: goto out;
1574: if (pad != (++i & 0xff)) {
1575: r = SSH_ERR_INVALID_FORMAT;
1576: goto out;
1577: }
1578: }
1579: /* success */
1580: r = 0;
1581: out:
1582: explicit_bzero(&pad, sizeof(pad));
1583: explicit_bzero(&i, sizeof(i));
1584: return r;
1585: }
1586:
1.76 djm 1587: int
1588: sshkey_unshield_private(struct sshkey *k)
1589: {
1590: struct sshbuf *prvbuf = NULL;
1.121 djm 1591: u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1.76 djm 1592: struct sshcipher_ctx *cctx = NULL;
1593: const struct sshcipher *cipher;
1594: struct sshkey *kswap = NULL, tmp;
1595: int r = SSH_ERR_INTERNAL_ERROR;
1596:
1597: #ifdef DEBUG_PK
1598: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1599: #endif
1600: if (!sshkey_is_shielded(k))
1601: return 0; /* nothing to do */
1602:
1603: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1604: r = SSH_ERR_INVALID_ARGUMENT;
1605: goto out;
1606: }
1607: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1608: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1609: r = SSH_ERR_INTERNAL_ERROR;
1610: goto out;
1611: }
1612: /* check size of shielded key blob */
1613: if (k->shielded_len < cipher_blocksize(cipher) ||
1614: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1615: r = SSH_ERR_INVALID_FORMAT;
1616: goto out;
1617: }
1618:
1619: /* Calculate the ephemeral key from the prekey */
1620: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1621: k->shield_prekey, k->shield_prekey_len,
1622: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1623: goto out;
1624: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1625: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1626: goto out;
1627: #ifdef DEBUG_PK
1628: fprintf(stderr, "%s: key+iv\n", __func__);
1629: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1630: stderr);
1631: #endif
1632:
1633: /* Decrypt and parse the shielded private key using the ephemeral key */
1634: if ((prvbuf = sshbuf_new()) == NULL) {
1635: r = SSH_ERR_ALLOC_FAIL;
1636: goto out;
1637: }
1638: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
1639: goto out;
1640: /* decrypt */
1641: #ifdef DEBUG_PK
1642: fprintf(stderr, "%s: encrypted\n", __func__);
1643: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
1644: #endif
1645: if ((r = cipher_crypt(cctx, 0, cp,
1646: k->shielded_private, k->shielded_len, 0, 0)) != 0)
1647: goto out;
1648: #ifdef DEBUG_PK
1649: fprintf(stderr, "%s: serialised\n", __func__);
1650: sshbuf_dump(prvbuf, stderr);
1651: #endif
1652: /* Parse private key */
1653: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
1654: goto out;
1.121 djm 1655:
1656: if ((r = private2_check_padding(prvbuf)) != 0)
1657: goto out;
1.76 djm 1658:
1659: /* Swap the parsed key back into place */
1660: tmp = *kswap;
1661: *kswap = *k;
1662: *k = tmp;
1663:
1664: /* success */
1665: r = 0;
1666:
1667: out:
1668: cipher_free(cctx);
1669: explicit_bzero(keyiv, sizeof(keyiv));
1670: explicit_bzero(&tmp, sizeof(tmp));
1671: sshkey_free(kswap);
1672: sshbuf_free(prvbuf);
1673: return r;
1674: }
1675:
1.1 djm 1676: static int
1.14 djm 1677: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1678: {
1.14 djm 1679: struct sshbuf *principals = NULL, *crit = NULL;
1680: struct sshbuf *exts = NULL, *ca = NULL;
1681: u_char *sig = NULL;
1682: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1683: int ret = SSH_ERR_INTERNAL_ERROR;
1684:
1685: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1686: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1687: return ret;
1688:
1.20 djm 1689: /* Parse body of certificate up to signature */
1690: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1691: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1692: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1693: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1694: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1695: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1696: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1697: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1698: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1699: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1700: /* XXX debug print error for ret */
1701: ret = SSH_ERR_INVALID_FORMAT;
1702: goto out;
1703: }
1704:
1705: /* Signature is left in the buffer so we can calculate this length */
1706: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1707:
1708: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1709: ret = SSH_ERR_INVALID_FORMAT;
1710: goto out;
1711: }
1712:
1713: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1714: key->cert->type != SSH2_CERT_TYPE_HOST) {
1715: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1716: goto out;
1717: }
1718:
1.4 djm 1719: /* Parse principals section */
1720: while (sshbuf_len(principals) > 0) {
1721: char *principal = NULL;
1722: char **oprincipals = NULL;
1723:
1.1 djm 1724: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1725: ret = SSH_ERR_INVALID_FORMAT;
1726: goto out;
1727: }
1.4 djm 1728: if ((ret = sshbuf_get_cstring(principals, &principal,
1729: NULL)) != 0) {
1.1 djm 1730: ret = SSH_ERR_INVALID_FORMAT;
1731: goto out;
1732: }
1733: oprincipals = key->cert->principals;
1.51 deraadt 1734: key->cert->principals = recallocarray(key->cert->principals,
1735: key->cert->nprincipals, key->cert->nprincipals + 1,
1736: sizeof(*key->cert->principals));
1.1 djm 1737: if (key->cert->principals == NULL) {
1738: free(principal);
1739: key->cert->principals = oprincipals;
1740: ret = SSH_ERR_ALLOC_FAIL;
1741: goto out;
1742: }
1743: key->cert->principals[key->cert->nprincipals++] = principal;
1744: }
1745:
1.4 djm 1746: /*
1747: * Stash a copies of the critical options and extensions sections
1748: * for later use.
1749: */
1750: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1751: (exts != NULL &&
1752: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1753: goto out;
1754:
1.4 djm 1755: /*
1756: * Validate critical options and extensions sections format.
1757: */
1758: while (sshbuf_len(crit) != 0) {
1759: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1760: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1761: sshbuf_reset(key->cert->critical);
1.1 djm 1762: ret = SSH_ERR_INVALID_FORMAT;
1763: goto out;
1764: }
1765: }
1.4 djm 1766: while (exts != NULL && sshbuf_len(exts) != 0) {
1767: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1768: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1769: sshbuf_reset(key->cert->extensions);
1.1 djm 1770: ret = SSH_ERR_INVALID_FORMAT;
1771: goto out;
1772: }
1773: }
1774:
1.4 djm 1775: /* Parse CA key and check signature */
1.14 djm 1776: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1777: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1778: goto out;
1779: }
1780: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1781: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1782: goto out;
1783: }
1784: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 1785: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 1786: goto out;
1.82 djm 1787: if ((ret = sshkey_get_sigtype(sig, slen,
1788: &key->cert->signature_type)) != 0)
1.67 djm 1789: goto out;
1.4 djm 1790:
1791: /* Success */
1.1 djm 1792: ret = 0;
1793: out:
1.14 djm 1794: sshbuf_free(ca);
1.4 djm 1795: sshbuf_free(crit);
1796: sshbuf_free(exts);
1797: sshbuf_free(principals);
1.1 djm 1798: free(sig);
1799: return ret;
1800: }
1801:
1.122 djm 1802: int
1803: sshkey_check_rsa_length(const struct sshkey *k, int min_size)
1804: {
1.83 djm 1805: #ifdef WITH_OPENSSL
1.69 djm 1806: const BIGNUM *rsa_n;
1.122 djm 1807: int nbits;
1.69 djm 1808:
1.122 djm 1809: if (k == NULL || k->rsa == NULL ||
1810: (k->type != KEY_RSA && k->type != KEY_RSA_CERT))
1811: return 0;
1812: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
1813: nbits = BN_num_bits(rsa_n);
1814: if (nbits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1815: (min_size > 0 && nbits < min_size))
1.69 djm 1816: return SSH_ERR_KEY_LENGTH;
1.122 djm 1817: #endif /* WITH_OPENSSL */
1.69 djm 1818: return 0;
1819: }
1820:
1821: static int
1.14 djm 1822: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1823: int allow_cert)
1.1 djm 1824: {
1.12 djm 1825: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 1826: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 1827: struct sshkey *key = NULL;
1828: size_t len;
1829: u_char *pk = NULL;
1.14 djm 1830: struct sshbuf *copy;
1.1 djm 1831: #ifdef WITH_OPENSSL
1832: EC_POINT *q = NULL;
1.69 djm 1833: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
1834: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 1835: #endif /* WITH_OPENSSL */
1836:
1837: #ifdef DEBUG_PK /* XXX */
1.14 djm 1838: sshbuf_dump(b, stderr);
1.1 djm 1839: #endif
1.32 djm 1840: if (keyp != NULL)
1841: *keyp = NULL;
1.14 djm 1842: if ((copy = sshbuf_fromb(b)) == NULL) {
1843: ret = SSH_ERR_ALLOC_FAIL;
1844: goto out;
1845: }
1.1 djm 1846: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1847: ret = SSH_ERR_INVALID_FORMAT;
1848: goto out;
1849: }
1850:
1851: type = sshkey_type_from_name(ktype);
1852: if (!allow_cert && sshkey_type_is_cert(type)) {
1853: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1854: goto out;
1855: }
1856: switch (type) {
1857: #ifdef WITH_OPENSSL
1858: case KEY_RSA_CERT:
1.14 djm 1859: /* Skip nonce */
1.1 djm 1860: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1861: ret = SSH_ERR_INVALID_FORMAT;
1862: goto out;
1863: }
1864: /* FALLTHROUGH */
1865: case KEY_RSA:
1866: if ((key = sshkey_new(type)) == NULL) {
1867: ret = SSH_ERR_ALLOC_FAIL;
1868: goto out;
1869: }
1.73 djm 1870: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
1871: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 1872: ret = SSH_ERR_INVALID_FORMAT;
1873: goto out;
1874: }
1.69 djm 1875: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
1876: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 1877: goto out;
1878: }
1.69 djm 1879: rsa_n = rsa_e = NULL; /* transferred */
1.122 djm 1880: if ((ret = sshkey_check_rsa_length(key, 0)) != 0)
1.69 djm 1881: goto out;
1.1 djm 1882: #ifdef DEBUG_PK
1883: RSA_print_fp(stderr, key->rsa, 8);
1884: #endif
1885: break;
1886: case KEY_DSA_CERT:
1.14 djm 1887: /* Skip nonce */
1.1 djm 1888: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1889: ret = SSH_ERR_INVALID_FORMAT;
1890: goto out;
1891: }
1892: /* FALLTHROUGH */
1893: case KEY_DSA:
1894: if ((key = sshkey_new(type)) == NULL) {
1895: ret = SSH_ERR_ALLOC_FAIL;
1896: goto out;
1897: }
1.73 djm 1898: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
1899: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
1900: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
1901: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 1902: ret = SSH_ERR_INVALID_FORMAT;
1903: goto out;
1904: }
1.69 djm 1905: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
1906: ret = SSH_ERR_LIBCRYPTO_ERROR;
1907: goto out;
1908: }
1909: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
1910: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
1911: ret = SSH_ERR_LIBCRYPTO_ERROR;
1912: goto out;
1913: }
1914: dsa_pub_key = NULL; /* transferred */
1.1 djm 1915: #ifdef DEBUG_PK
1916: DSA_print_fp(stderr, key->dsa, 8);
1917: #endif
1918: break;
1919: case KEY_ECDSA_CERT:
1.85 djm 1920: case KEY_ECDSA_SK_CERT:
1.14 djm 1921: /* Skip nonce */
1.1 djm 1922: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1923: ret = SSH_ERR_INVALID_FORMAT;
1924: goto out;
1925: }
1926: /* FALLTHROUGH */
1927: case KEY_ECDSA:
1.85 djm 1928: case KEY_ECDSA_SK:
1.1 djm 1929: if ((key = sshkey_new(type)) == NULL) {
1930: ret = SSH_ERR_ALLOC_FAIL;
1931: goto out;
1932: }
1.12 djm 1933: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 1934: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1935: ret = SSH_ERR_INVALID_FORMAT;
1936: goto out;
1937: }
1938: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1939: ret = SSH_ERR_EC_CURVE_MISMATCH;
1940: goto out;
1941: }
1.60 jsing 1942: EC_KEY_free(key->ecdsa);
1.1 djm 1943: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1944: == NULL) {
1945: ret = SSH_ERR_EC_CURVE_INVALID;
1946: goto out;
1947: }
1948: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
1949: ret = SSH_ERR_ALLOC_FAIL;
1950: goto out;
1951: }
1952: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
1953: ret = SSH_ERR_INVALID_FORMAT;
1954: goto out;
1955: }
1956: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1957: q) != 0) {
1958: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1959: goto out;
1960: }
1961: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
1962: /* XXX assume it is a allocation error */
1963: ret = SSH_ERR_ALLOC_FAIL;
1964: goto out;
1965: }
1966: #ifdef DEBUG_PK
1967: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1968: #endif
1.85 djm 1969: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
1970: /* Parse additional security-key application string */
1971: if (sshbuf_get_cstring(b, &key->sk_application,
1972: NULL) != 0) {
1973: ret = SSH_ERR_INVALID_FORMAT;
1974: goto out;
1975: }
1976: #ifdef DEBUG_PK
1977: fprintf(stderr, "App: %s\n", key->sk_application);
1978: #endif
1979: }
1.1 djm 1980: break;
1981: #endif /* WITH_OPENSSL */
1982: case KEY_ED25519_CERT:
1.90 markus 1983: case KEY_ED25519_SK_CERT:
1.14 djm 1984: /* Skip nonce */
1.1 djm 1985: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1986: ret = SSH_ERR_INVALID_FORMAT;
1987: goto out;
1988: }
1989: /* FALLTHROUGH */
1990: case KEY_ED25519:
1.90 markus 1991: case KEY_ED25519_SK:
1.1 djm 1992: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
1993: goto out;
1994: if (len != ED25519_PK_SZ) {
1995: ret = SSH_ERR_INVALID_FORMAT;
1996: goto out;
1997: }
1998: if ((key = sshkey_new(type)) == NULL) {
1999: ret = SSH_ERR_ALLOC_FAIL;
2000: goto out;
2001: }
1.90 markus 2002: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2003: /* Parse additional security-key application string */
2004: if (sshbuf_get_cstring(b, &key->sk_application,
2005: NULL) != 0) {
2006: ret = SSH_ERR_INVALID_FORMAT;
2007: goto out;
2008: }
2009: #ifdef DEBUG_PK
2010: fprintf(stderr, "App: %s\n", key->sk_application);
2011: #endif
2012: }
1.1 djm 2013: key->ed25519_pk = pk;
2014: pk = NULL;
2015: break;
1.62 markus 2016: #ifdef WITH_XMSS
2017: case KEY_XMSS_CERT:
2018: /* Skip nonce */
2019: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2020: ret = SSH_ERR_INVALID_FORMAT;
2021: goto out;
2022: }
2023: /* FALLTHROUGH */
2024: case KEY_XMSS:
2025: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2026: goto out;
2027: if ((key = sshkey_new(type)) == NULL) {
2028: ret = SSH_ERR_ALLOC_FAIL;
2029: goto out;
2030: }
2031: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2032: goto out;
2033: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2034: goto out;
2035: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2036: ret = SSH_ERR_INVALID_FORMAT;
2037: goto out;
2038: }
2039: key->xmss_pk = pk;
2040: pk = NULL;
2041: if (type != KEY_XMSS_CERT &&
2042: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2043: goto out;
2044: break;
2045: #endif /* WITH_XMSS */
1.1 djm 2046: case KEY_UNSPEC:
2047: default:
2048: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2049: goto out;
2050: }
2051:
2052: /* Parse certificate potion */
1.14 djm 2053: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2054: goto out;
2055:
2056: if (key != NULL && sshbuf_len(b) != 0) {
2057: ret = SSH_ERR_INVALID_FORMAT;
2058: goto out;
2059: }
2060: ret = 0;
1.32 djm 2061: if (keyp != NULL) {
2062: *keyp = key;
2063: key = NULL;
2064: }
1.1 djm 2065: out:
1.14 djm 2066: sshbuf_free(copy);
1.1 djm 2067: sshkey_free(key);
1.62 markus 2068: free(xmss_name);
1.1 djm 2069: free(ktype);
2070: free(curve);
2071: free(pk);
2072: #ifdef WITH_OPENSSL
1.60 jsing 2073: EC_POINT_free(q);
1.69 djm 2074: BN_clear_free(rsa_n);
2075: BN_clear_free(rsa_e);
2076: BN_clear_free(dsa_p);
2077: BN_clear_free(dsa_q);
2078: BN_clear_free(dsa_g);
2079: BN_clear_free(dsa_pub_key);
1.1 djm 2080: #endif /* WITH_OPENSSL */
2081: return ret;
2082: }
2083:
2084: int
2085: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2086: {
1.14 djm 2087: struct sshbuf *b;
2088: int r;
2089:
2090: if ((b = sshbuf_from(blob, blen)) == NULL)
2091: return SSH_ERR_ALLOC_FAIL;
2092: r = sshkey_from_blob_internal(b, keyp, 1);
2093: sshbuf_free(b);
2094: return r;
2095: }
2096:
2097: int
2098: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2099: {
2100: return sshkey_from_blob_internal(b, keyp, 1);
2101: }
2102:
2103: int
2104: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2105: {
2106: struct sshbuf *b;
2107: int r;
2108:
2109: if ((r = sshbuf_froms(buf, &b)) != 0)
2110: return r;
2111: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2112: sshbuf_free(b);
2113: return r;
2114: }
2115:
1.82 djm 2116: int
2117: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2118: {
2119: int r;
2120: struct sshbuf *b = NULL;
2121: char *sigtype = NULL;
2122:
2123: if (sigtypep != NULL)
2124: *sigtypep = NULL;
2125: if ((b = sshbuf_from(sig, siglen)) == NULL)
2126: return SSH_ERR_ALLOC_FAIL;
2127: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2128: goto out;
2129: /* success */
2130: if (sigtypep != NULL) {
2131: *sigtypep = sigtype;
2132: sigtype = NULL;
2133: }
2134: r = 0;
2135: out:
2136: free(sigtype);
1.14 djm 2137: sshbuf_free(b);
2138: return r;
1.68 djm 2139: }
2140:
2141: /*
2142: *
2143: * Checks whether a certificate's signature type is allowed.
2144: * Returns 0 (success) if the certificate signature type appears in the
2145: * "allowed" pattern-list, or the key is not a certificate to begin with.
2146: * Otherwise returns a ssherr.h code.
2147: */
2148: int
2149: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2150: {
2151: if (key == NULL || allowed == NULL)
2152: return SSH_ERR_INVALID_ARGUMENT;
2153: if (!sshkey_type_is_cert(key->type))
2154: return 0;
2155: if (key->cert == NULL || key->cert->signature_type == NULL)
2156: return SSH_ERR_INVALID_ARGUMENT;
2157: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2158: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2159: return 0;
1.65 djm 2160: }
2161:
2162: /*
2163: * Returns the expected signature algorithm for a given public key algorithm.
2164: */
1.66 djm 2165: const char *
2166: sshkey_sigalg_by_name(const char *name)
1.65 djm 2167: {
1.123 djm 2168: const struct sshkey_impl *impl;
2169: int i;
1.65 djm 2170:
1.123 djm 2171: for (i = 0; keyimpls[i] != NULL; i++) {
2172: impl = keyimpls[i];
2173: if (strcmp(impl->name, name) != 0)
1.65 djm 2174: continue;
1.123 djm 2175: if (impl->sigalg != NULL)
2176: return impl->sigalg;
2177: if (!impl->cert)
2178: return impl->name;
1.65 djm 2179: return sshkey_ssh_name_from_type_nid(
1.123 djm 2180: sshkey_type_plain(impl->type), impl->nid);
1.65 djm 2181: }
2182: return NULL;
2183: }
2184:
2185: /*
2186: * Verifies that the signature algorithm appearing inside the signature blob
2187: * matches that which was requested.
2188: */
2189: int
2190: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2191: const char *requested_alg)
2192: {
2193: const char *expected_alg;
2194: char *sigtype = NULL;
2195: int r;
2196:
2197: if (requested_alg == NULL)
2198: return 0;
1.66 djm 2199: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2200: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2201: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2202: return r;
2203: r = strcmp(expected_alg, sigtype) == 0;
2204: free(sigtype);
2205: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2206: }
2207:
2208: int
1.76 djm 2209: sshkey_sign(struct sshkey *key,
1.1 djm 2210: u_char **sigp, size_t *lenp,
1.86 djm 2211: const u_char *data, size_t datalen,
1.111 djm 2212: const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
1.1 djm 2213: {
1.76 djm 2214: int was_shielded = sshkey_is_shielded(key);
2215: int r2, r = SSH_ERR_INTERNAL_ERROR;
2216:
1.1 djm 2217: if (sigp != NULL)
2218: *sigp = NULL;
2219: if (lenp != NULL)
2220: *lenp = 0;
2221: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2222: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2223: if ((r = sshkey_unshield_private(key)) != 0)
2224: return r;
1.1 djm 2225: switch (key->type) {
2226: #ifdef WITH_OPENSSL
2227: case KEY_DSA_CERT:
2228: case KEY_DSA:
1.76 djm 2229: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2230: break;
1.1 djm 2231: case KEY_ECDSA_CERT:
2232: case KEY_ECDSA:
1.76 djm 2233: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2234: break;
1.1 djm 2235: case KEY_RSA_CERT:
2236: case KEY_RSA:
1.76 djm 2237: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2238: break;
1.1 djm 2239: #endif /* WITH_OPENSSL */
2240: case KEY_ED25519:
2241: case KEY_ED25519_CERT:
1.76 djm 2242: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2243: break;
2244: case KEY_ED25519_SK:
2245: case KEY_ED25519_SK_CERT:
1.97 djm 2246: case KEY_ECDSA_SK_CERT:
2247: case KEY_ECDSA_SK:
2248: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.111 djm 2249: datalen, compat, sk_pin);
1.76 djm 2250: break;
1.62 markus 2251: #ifdef WITH_XMSS
2252: case KEY_XMSS:
2253: case KEY_XMSS_CERT:
1.76 djm 2254: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2255: break;
1.62 markus 2256: #endif /* WITH_XMSS */
1.1 djm 2257: default:
1.76 djm 2258: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2259: break;
1.1 djm 2260: }
1.76 djm 2261: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2262: return r2;
2263: return r;
1.1 djm 2264: }
2265:
2266: /*
2267: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2268: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2269: */
2270: int
2271: sshkey_verify(const struct sshkey *key,
2272: const u_char *sig, size_t siglen,
1.96 djm 2273: const u_char *data, size_t dlen, const char *alg, u_int compat,
2274: struct sshkey_sig_details **detailsp)
1.1 djm 2275: {
1.96 djm 2276: if (detailsp != NULL)
2277: *detailsp = NULL;
1.6 djm 2278: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2279: return SSH_ERR_INVALID_ARGUMENT;
2280: switch (key->type) {
2281: #ifdef WITH_OPENSSL
2282: case KEY_DSA_CERT:
2283: case KEY_DSA:
2284: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2285: case KEY_ECDSA_CERT:
2286: case KEY_ECDSA:
2287: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2288: case KEY_ECDSA_SK_CERT:
2289: case KEY_ECDSA_SK:
2290: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2291: compat, detailsp);
1.1 djm 2292: case KEY_RSA_CERT:
2293: case KEY_RSA:
1.59 djm 2294: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2295: #endif /* WITH_OPENSSL */
2296: case KEY_ED25519:
2297: case KEY_ED25519_CERT:
2298: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2299: case KEY_ED25519_SK:
2300: case KEY_ED25519_SK_CERT:
2301: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2302: compat, detailsp);
1.62 markus 2303: #ifdef WITH_XMSS
2304: case KEY_XMSS:
2305: case KEY_XMSS_CERT:
2306: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2307: #endif /* WITH_XMSS */
1.1 djm 2308: default:
2309: return SSH_ERR_KEY_TYPE_UNKNOWN;
2310: }
2311: }
2312:
2313: /* Convert a plain key to their _CERT equivalent */
2314: int
1.20 djm 2315: sshkey_to_certified(struct sshkey *k)
1.1 djm 2316: {
2317: int newtype;
2318:
2319: switch (k->type) {
2320: #ifdef WITH_OPENSSL
2321: case KEY_RSA:
1.20 djm 2322: newtype = KEY_RSA_CERT;
1.1 djm 2323: break;
2324: case KEY_DSA:
1.20 djm 2325: newtype = KEY_DSA_CERT;
1.1 djm 2326: break;
2327: case KEY_ECDSA:
2328: newtype = KEY_ECDSA_CERT;
2329: break;
1.85 djm 2330: case KEY_ECDSA_SK:
2331: newtype = KEY_ECDSA_SK_CERT;
2332: break;
1.1 djm 2333: #endif /* WITH_OPENSSL */
1.90 markus 2334: case KEY_ED25519_SK:
2335: newtype = KEY_ED25519_SK_CERT;
2336: break;
1.1 djm 2337: case KEY_ED25519:
2338: newtype = KEY_ED25519_CERT;
2339: break;
1.62 markus 2340: #ifdef WITH_XMSS
2341: case KEY_XMSS:
2342: newtype = KEY_XMSS_CERT;
2343: break;
2344: #endif /* WITH_XMSS */
1.1 djm 2345: default:
2346: return SSH_ERR_INVALID_ARGUMENT;
2347: }
2348: if ((k->cert = cert_new()) == NULL)
2349: return SSH_ERR_ALLOC_FAIL;
2350: k->type = newtype;
2351: return 0;
2352: }
2353:
2354: /* Convert a certificate to its raw key equivalent */
2355: int
2356: sshkey_drop_cert(struct sshkey *k)
2357: {
2358: if (!sshkey_type_is_cert(k->type))
2359: return SSH_ERR_KEY_TYPE_UNKNOWN;
2360: cert_free(k->cert);
2361: k->cert = NULL;
2362: k->type = sshkey_type_plain(k->type);
2363: return 0;
2364: }
2365:
2366: /* Sign a certified key, (re-)generating the signed certblob. */
2367: int
1.53 djm 2368: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2369: const char *sk_provider, const char *sk_pin,
2370: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2371: {
2372: struct sshbuf *principals = NULL;
2373: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2374: size_t i, ca_len, sig_len;
2375: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2376: struct sshbuf *cert = NULL;
2377: char *sigtype = NULL;
1.69 djm 2378: #ifdef WITH_OPENSSL
2379: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2380: #endif /* WITH_OPENSSL */
1.1 djm 2381:
2382: if (k == NULL || k->cert == NULL ||
2383: k->cert->certblob == NULL || ca == NULL)
2384: return SSH_ERR_INVALID_ARGUMENT;
2385: if (!sshkey_is_cert(k))
2386: return SSH_ERR_KEY_TYPE_UNKNOWN;
2387: if (!sshkey_type_is_valid_ca(ca->type))
2388: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2389:
1.67 djm 2390: /*
2391: * If no alg specified as argument but a signature_type was set,
2392: * then prefer that. If both were specified, then they must match.
2393: */
2394: if (alg == NULL)
2395: alg = k->cert->signature_type;
2396: else if (k->cert->signature_type != NULL &&
2397: strcmp(alg, k->cert->signature_type) != 0)
2398: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2399:
2400: /*
2401: * If no signing algorithm or signature_type was specified and we're
2402: * using a RSA key, then default to a good signature algorithm.
2403: */
2404: if (alg == NULL && ca->type == KEY_RSA)
2405: alg = "rsa-sha2-512";
1.67 djm 2406:
1.1 djm 2407: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2408: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2409:
2410: cert = k->cert->certblob; /* for readability */
2411: sshbuf_reset(cert);
2412: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2413: goto out;
2414:
2415: /* -v01 certs put nonce first */
2416: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2417: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2418: goto out;
1.1 djm 2419:
2420: /* XXX this substantially duplicates to_blob(); refactor */
2421: switch (k->type) {
2422: #ifdef WITH_OPENSSL
2423: case KEY_DSA_CERT:
1.69 djm 2424: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2425: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2426: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2427: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2428: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2429: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2430: goto out;
2431: break;
2432: case KEY_ECDSA_CERT:
1.85 djm 2433: case KEY_ECDSA_SK_CERT:
1.1 djm 2434: if ((ret = sshbuf_put_cstring(cert,
2435: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2436: (ret = sshbuf_put_ec(cert,
2437: EC_KEY_get0_public_key(k->ecdsa),
2438: EC_KEY_get0_group(k->ecdsa))) != 0)
2439: goto out;
1.85 djm 2440: if (k->type == KEY_ECDSA_SK_CERT) {
2441: if ((ret = sshbuf_put_cstring(cert,
2442: k->sk_application)) != 0)
2443: goto out;
2444: }
1.1 djm 2445: break;
2446: case KEY_RSA_CERT:
1.69 djm 2447: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2448: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2449: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2450: goto out;
2451: break;
2452: #endif /* WITH_OPENSSL */
2453: case KEY_ED25519_CERT:
1.94 djm 2454: case KEY_ED25519_SK_CERT:
1.1 djm 2455: if ((ret = sshbuf_put_string(cert,
2456: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2457: goto out;
1.94 djm 2458: if (k->type == KEY_ED25519_SK_CERT) {
2459: if ((ret = sshbuf_put_cstring(cert,
2460: k->sk_application)) != 0)
2461: goto out;
2462: }
1.1 djm 2463: break;
1.62 markus 2464: #ifdef WITH_XMSS
2465: case KEY_XMSS_CERT:
2466: if (k->xmss_name == NULL) {
2467: ret = SSH_ERR_INVALID_ARGUMENT;
2468: goto out;
2469: }
2470: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2471: (ret = sshbuf_put_string(cert,
2472: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2473: goto out;
2474: break;
2475: #endif /* WITH_XMSS */
1.1 djm 2476: default:
2477: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2478: goto out;
1.1 djm 2479: }
2480:
1.20 djm 2481: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2482: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2483: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2484: goto out;
2485:
2486: if ((principals = sshbuf_new()) == NULL) {
2487: ret = SSH_ERR_ALLOC_FAIL;
2488: goto out;
2489: }
2490: for (i = 0; i < k->cert->nprincipals; i++) {
2491: if ((ret = sshbuf_put_cstring(principals,
2492: k->cert->principals[i])) != 0)
2493: goto out;
2494: }
2495: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2496: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2497: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2498: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2499: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2500: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2501: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2502: goto out;
2503:
2504: /* Sign the whole mess */
1.53 djm 2505: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.111 djm 2506: sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
1.1 djm 2507: goto out;
1.67 djm 2508: /* Check and update signature_type against what was actually used */
1.82 djm 2509: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2510: goto out;
2511: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2512: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2513: goto out;
2514: }
2515: if (k->cert->signature_type == NULL) {
2516: k->cert->signature_type = sigtype;
2517: sigtype = NULL;
2518: }
1.1 djm 2519: /* Append signature and we are done */
2520: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2521: goto out;
2522: ret = 0;
2523: out:
2524: if (ret != 0)
2525: sshbuf_reset(cert);
1.29 mmcc 2526: free(sig_blob);
2527: free(ca_blob);
1.67 djm 2528: free(sigtype);
1.31 mmcc 2529: sshbuf_free(principals);
1.1 djm 2530: return ret;
1.53 djm 2531: }
2532:
2533: static int
1.76 djm 2534: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2535: const u_char *data, size_t datalen,
1.111 djm 2536: const char *alg, const char *sk_provider, const char *sk_pin,
2537: u_int compat, void *ctx)
1.53 djm 2538: {
2539: if (ctx != NULL)
2540: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2541: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
1.111 djm 2542: sk_provider, sk_pin, compat);
1.53 djm 2543: }
2544:
2545: int
1.86 djm 2546: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2547: const char *sk_provider, const char *sk_pin)
1.53 djm 2548: {
1.111 djm 2549: return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
1.86 djm 2550: default_key_sign, NULL);
1.1 djm 2551: }
2552:
2553: int
2554: sshkey_cert_check_authority(const struct sshkey *k,
1.114 djm 2555: int want_host, int require_principal, int wildcard_pattern,
1.119 djm 2556: uint64_t verify_time, const char *name, const char **reason)
1.1 djm 2557: {
2558: u_int i, principal_matches;
2559:
1.102 markus 2560: if (reason == NULL)
2561: return SSH_ERR_INVALID_ARGUMENT;
1.114 djm 2562: if (!sshkey_is_cert(k)) {
2563: *reason = "Key is not a certificate";
2564: return SSH_ERR_KEY_CERT_INVALID;
2565: }
1.1 djm 2566: if (want_host) {
2567: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2568: *reason = "Certificate invalid: not a host certificate";
2569: return SSH_ERR_KEY_CERT_INVALID;
2570: }
2571: } else {
2572: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2573: *reason = "Certificate invalid: not a user certificate";
2574: return SSH_ERR_KEY_CERT_INVALID;
2575: }
2576: }
1.119 djm 2577: if (verify_time < k->cert->valid_after) {
1.1 djm 2578: *reason = "Certificate invalid: not yet valid";
2579: return SSH_ERR_KEY_CERT_INVALID;
2580: }
1.119 djm 2581: if (verify_time >= k->cert->valid_before) {
1.1 djm 2582: *reason = "Certificate invalid: expired";
2583: return SSH_ERR_KEY_CERT_INVALID;
2584: }
2585: if (k->cert->nprincipals == 0) {
2586: if (require_principal) {
2587: *reason = "Certificate lacks principal list";
2588: return SSH_ERR_KEY_CERT_INVALID;
2589: }
2590: } else if (name != NULL) {
2591: principal_matches = 0;
2592: for (i = 0; i < k->cert->nprincipals; i++) {
1.114 djm 2593: if (wildcard_pattern) {
2594: if (match_pattern(k->cert->principals[i],
2595: name)) {
2596: principal_matches = 1;
2597: break;
2598: }
2599: } else if (strcmp(name, k->cert->principals[i]) == 0) {
1.1 djm 2600: principal_matches = 1;
2601: break;
2602: }
2603: }
2604: if (!principal_matches) {
2605: *reason = "Certificate invalid: name is not a listed "
2606: "principal";
2607: return SSH_ERR_KEY_CERT_INVALID;
2608: }
1.114 djm 2609: }
2610: return 0;
2611: }
2612:
2613: int
1.119 djm 2614: sshkey_cert_check_authority_now(const struct sshkey *k,
2615: int want_host, int require_principal, int wildcard_pattern,
2616: const char *name, const char **reason)
2617: {
2618: time_t now;
2619:
2620: if ((now = time(NULL)) < 0) {
2621: /* yikes - system clock before epoch! */
2622: *reason = "Certificate invalid: not yet valid";
2623: return SSH_ERR_KEY_CERT_INVALID;
2624: }
2625: return sshkey_cert_check_authority(k, want_host, require_principal,
2626: wildcard_pattern, (uint64_t)now, name, reason);
2627: }
2628:
2629: int
1.114 djm 2630: sshkey_cert_check_host(const struct sshkey *key, const char *host,
2631: int wildcard_principals, const char *ca_sign_algorithms,
2632: const char **reason)
2633: {
2634: int r;
2635:
1.119 djm 2636: if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
1.114 djm 2637: host, reason)) != 0)
2638: return r;
2639: if (sshbuf_len(key->cert->critical) != 0) {
2640: *reason = "Certificate contains unsupported critical options";
2641: return SSH_ERR_KEY_CERT_INVALID;
2642: }
2643: if (ca_sign_algorithms != NULL &&
2644: (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2645: *reason = "Certificate signed with disallowed algorithm";
2646: return SSH_ERR_KEY_CERT_INVALID;
1.1 djm 2647: }
2648: return 0;
1.27 djm 2649: }
2650:
2651: size_t
2652: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2653: {
1.113 dtucker 2654: char from[32], to[32], ret[128];
1.27 djm 2655:
2656: *from = *to = '\0';
2657: if (cert->valid_after == 0 &&
2658: cert->valid_before == 0xffffffffffffffffULL)
2659: return strlcpy(s, "forever", l);
2660:
1.118 dtucker 2661: if (cert->valid_after != 0)
2662: format_absolute_time(cert->valid_after, from, sizeof(from));
2663: if (cert->valid_before != 0xffffffffffffffffULL)
2664: format_absolute_time(cert->valid_before, to, sizeof(to));
1.27 djm 2665:
2666: if (cert->valid_after == 0)
2667: snprintf(ret, sizeof(ret), "before %s", to);
2668: else if (cert->valid_before == 0xffffffffffffffffULL)
2669: snprintf(ret, sizeof(ret), "after %s", from);
2670: else
2671: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2672:
2673: return strlcpy(s, ret, l);
1.1 djm 2674: }
2675:
2676: int
1.76 djm 2677: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2678: enum sshkey_serialize_rep opts)
1.1 djm 2679: {
2680: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2681: int was_shielded = sshkey_is_shielded(key);
2682: struct sshbuf *b = NULL;
1.69 djm 2683: #ifdef WITH_OPENSSL
2684: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2685: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2686: #endif /* WITH_OPENSSL */
1.1 djm 2687:
1.76 djm 2688: if ((r = sshkey_unshield_private(key)) != 0)
2689: return r;
2690: if ((b = sshbuf_new()) == NULL)
2691: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2692: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2693: goto out;
2694: switch (key->type) {
2695: #ifdef WITH_OPENSSL
2696: case KEY_RSA:
1.69 djm 2697: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2698: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2699: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2700: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2701: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2702: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2703: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2704: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2705: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2706: goto out;
2707: break;
2708: case KEY_RSA_CERT:
2709: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2710: r = SSH_ERR_INVALID_ARGUMENT;
2711: goto out;
2712: }
1.69 djm 2713: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2714: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2715: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2716: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2717: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2718: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2719: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2720: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2721: goto out;
2722: break;
2723: case KEY_DSA:
1.69 djm 2724: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2725: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2726: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2727: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2728: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2729: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2730: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2731: goto out;
2732: break;
2733: case KEY_DSA_CERT:
2734: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2735: r = SSH_ERR_INVALID_ARGUMENT;
2736: goto out;
2737: }
1.69 djm 2738: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2739: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2740: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2741: goto out;
2742: break;
2743: case KEY_ECDSA:
2744: if ((r = sshbuf_put_cstring(b,
2745: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2746: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2747: (r = sshbuf_put_bignum2(b,
2748: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2749: goto out;
2750: break;
2751: case KEY_ECDSA_CERT:
2752: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2753: r = SSH_ERR_INVALID_ARGUMENT;
2754: goto out;
2755: }
2756: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2757: (r = sshbuf_put_bignum2(b,
2758: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2759: goto out;
2760: break;
1.85 djm 2761: case KEY_ECDSA_SK:
2762: if ((r = sshbuf_put_cstring(b,
2763: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2764: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2765: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2766: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2767: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2768: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2769: goto out;
2770: break;
2771: case KEY_ECDSA_SK_CERT:
2772: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2773: r = SSH_ERR_INVALID_ARGUMENT;
2774: goto out;
2775: }
2776: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2777: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2778: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2779: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2780: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2781: goto out;
2782: break;
1.1 djm 2783: #endif /* WITH_OPENSSL */
2784: case KEY_ED25519:
2785: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2786: ED25519_PK_SZ)) != 0 ||
2787: (r = sshbuf_put_string(b, key->ed25519_sk,
2788: ED25519_SK_SZ)) != 0)
2789: goto out;
2790: break;
2791: case KEY_ED25519_CERT:
2792: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2793: r = SSH_ERR_INVALID_ARGUMENT;
2794: goto out;
2795: }
2796: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2797: (r = sshbuf_put_string(b, key->ed25519_pk,
2798: ED25519_PK_SZ)) != 0 ||
2799: (r = sshbuf_put_string(b, key->ed25519_sk,
2800: ED25519_SK_SZ)) != 0)
2801: goto out;
2802: break;
1.90 markus 2803: case KEY_ED25519_SK:
2804: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2805: ED25519_PK_SZ)) != 0 ||
2806: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2807: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2808: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2809: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2810: goto out;
2811: break;
2812: case KEY_ED25519_SK_CERT:
2813: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2814: r = SSH_ERR_INVALID_ARGUMENT;
2815: goto out;
2816: }
2817: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2818: (r = sshbuf_put_string(b, key->ed25519_pk,
2819: ED25519_PK_SZ)) != 0 ||
2820: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2821: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2822: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2823: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2824: goto out;
2825: break;
1.62 markus 2826: #ifdef WITH_XMSS
2827: case KEY_XMSS:
2828: if (key->xmss_name == NULL) {
2829: r = SSH_ERR_INVALID_ARGUMENT;
2830: goto out;
2831: }
2832: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2833: (r = sshbuf_put_string(b, key->xmss_pk,
2834: sshkey_xmss_pklen(key))) != 0 ||
2835: (r = sshbuf_put_string(b, key->xmss_sk,
2836: sshkey_xmss_sklen(key))) != 0 ||
2837: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2838: goto out;
2839: break;
2840: case KEY_XMSS_CERT:
2841: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2842: key->xmss_name == NULL) {
2843: r = SSH_ERR_INVALID_ARGUMENT;
2844: goto out;
2845: }
2846: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2847: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2848: (r = sshbuf_put_string(b, key->xmss_pk,
2849: sshkey_xmss_pklen(key))) != 0 ||
2850: (r = sshbuf_put_string(b, key->xmss_sk,
2851: sshkey_xmss_sklen(key))) != 0 ||
2852: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2853: goto out;
2854: break;
2855: #endif /* WITH_XMSS */
1.1 djm 2856: default:
2857: r = SSH_ERR_INVALID_ARGUMENT;
2858: goto out;
2859: }
1.76 djm 2860: /*
2861: * success (but we still need to append the output to buf after
2862: * possibly re-shielding the private key)
2863: */
1.1 djm 2864: r = 0;
2865: out:
1.76 djm 2866: if (was_shielded)
2867: r = sshkey_shield_private(key);
2868: if (r == 0)
2869: r = sshbuf_putb(buf, b);
2870: sshbuf_free(b);
2871:
1.1 djm 2872: return r;
2873: }
2874:
2875: int
1.76 djm 2876: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 2877: {
2878: return sshkey_private_serialize_opt(key, b,
2879: SSHKEY_SERIALIZE_DEFAULT);
2880: }
2881:
2882: int
1.1 djm 2883: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2884: {
1.62 markus 2885: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.115 djm 2886: char *expect_sk_application = NULL;
1.1 djm 2887: struct sshkey *k = NULL;
1.14 djm 2888: size_t pklen = 0, sklen = 0;
1.1 djm 2889: int type, r = SSH_ERR_INTERNAL_ERROR;
2890: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.115 djm 2891: u_char *expect_ed25519_pk = NULL;
1.62 markus 2892: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2893: #ifdef WITH_OPENSSL
2894: BIGNUM *exponent = NULL;
1.69 djm 2895: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2896: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2897: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2898: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2899: #endif /* WITH_OPENSSL */
2900:
2901: if (kp != NULL)
2902: *kp = NULL;
2903: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2904: goto out;
2905: type = sshkey_type_from_name(tname);
1.108 djm 2906: if (sshkey_type_is_cert(type)) {
2907: /*
2908: * Certificate key private keys begin with the certificate
2909: * itself. Make sure this matches the type of the enclosing
2910: * private key.
2911: */
2912: if ((r = sshkey_froms(buf, &k)) != 0)
2913: goto out;
2914: if (k->type != type) {
2915: r = SSH_ERR_KEY_CERT_MISMATCH;
2916: goto out;
2917: }
2918: /* For ECDSA keys, the group must match too */
2919: if (k->type == KEY_ECDSA &&
2920: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2921: r = SSH_ERR_KEY_CERT_MISMATCH;
2922: goto out;
2923: }
1.115 djm 2924: /*
2925: * Several fields are redundant between certificate and
2926: * private key body, we require these to match.
2927: */
2928: expect_sk_application = k->sk_application;
2929: expect_ed25519_pk = k->ed25519_pk;
2930: k->sk_application = NULL;
2931: k->ed25519_pk = NULL;
1.108 djm 2932: } else {
1.70 djm 2933: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2934: r = SSH_ERR_ALLOC_FAIL;
2935: goto out;
2936: }
1.108 djm 2937: }
2938: switch (type) {
2939: #ifdef WITH_OPENSSL
2940: case KEY_DSA:
1.73 djm 2941: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
2942: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
2943: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
1.108 djm 2944: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0)
1.69 djm 2945: goto out;
2946: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2947: r = SSH_ERR_LIBCRYPTO_ERROR;
2948: goto out;
2949: }
2950: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
1.108 djm 2951: if (!DSA_set0_key(k->dsa, dsa_pub_key, NULL)) {
1.69 djm 2952: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2953: goto out;
1.69 djm 2954: }
1.108 djm 2955: dsa_pub_key = NULL; /* transferred */
2956: /* FALLTHROUGH */
1.1 djm 2957: case KEY_DSA_CERT:
1.108 djm 2958: if ((r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.84 djm 2959: goto out;
1.69 djm 2960: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2961: r = SSH_ERR_LIBCRYPTO_ERROR;
2962: goto out;
2963: }
2964: dsa_priv_key = NULL; /* transferred */
1.1 djm 2965: break;
2966: case KEY_ECDSA:
2967: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2968: r = SSH_ERR_INVALID_ARGUMENT;
2969: goto out;
2970: }
2971: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2972: goto out;
2973: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2974: r = SSH_ERR_EC_CURVE_MISMATCH;
2975: goto out;
2976: }
2977: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 2978: if (k->ecdsa == NULL) {
1.1 djm 2979: r = SSH_ERR_LIBCRYPTO_ERROR;
2980: goto out;
2981: }
1.108 djm 2982: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0)
1.1 djm 2983: goto out;
1.108 djm 2984: /* FALLTHROUGH */
1.1 djm 2985: case KEY_ECDSA_CERT:
1.108 djm 2986: if ((r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 2987: goto out;
2988: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2989: r = SSH_ERR_LIBCRYPTO_ERROR;
2990: goto out;
2991: }
2992: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2993: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2994: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2995: goto out;
2996: break;
1.85 djm 2997: case KEY_ECDSA_SK:
2998: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2999: r = SSH_ERR_INVALID_ARGUMENT;
3000: goto out;
3001: }
3002: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3003: goto out;
3004: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3005: r = SSH_ERR_EC_CURVE_MISMATCH;
3006: goto out;
3007: }
3008: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3009: (k->sk_reserved = sshbuf_new()) == NULL) {
3010: r = SSH_ERR_ALLOC_FAIL;
3011: goto out;
3012: }
3013: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3014: if (k->ecdsa == NULL) {
3015: r = SSH_ERR_LIBCRYPTO_ERROR;
3016: goto out;
3017: }
3018: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3019: (r = sshbuf_get_cstring(buf, &k->sk_application,
3020: NULL)) != 0 ||
3021: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3022: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3023: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3024: goto out;
3025: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3026: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3027: goto out;
3028: break;
3029: case KEY_ECDSA_SK_CERT:
3030: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3031: (k->sk_reserved = sshbuf_new()) == NULL) {
3032: r = SSH_ERR_ALLOC_FAIL;
3033: goto out;
3034: }
3035: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3036: NULL)) != 0 ||
3037: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3038: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3039: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3040: goto out;
3041: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3042: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3043: goto out;
3044: break;
1.1 djm 3045: case KEY_RSA:
1.73 djm 3046: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
1.108 djm 3047: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0)
1.1 djm 3048: goto out;
1.108 djm 3049: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, NULL)) {
1.69 djm 3050: r = SSH_ERR_LIBCRYPTO_ERROR;
3051: goto out;
3052: }
1.108 djm 3053: rsa_n = rsa_e = NULL; /* transferred */
3054: /* FALLTHROUGH */
1.1 djm 3055: case KEY_RSA_CERT:
1.108 djm 3056: if ((r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
1.73 djm 3057: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3058: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3059: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3060: goto out;
1.69 djm 3061: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3062: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3063: goto out;
3064: }
1.69 djm 3065: rsa_d = NULL; /* transferred */
3066: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3067: r = SSH_ERR_LIBCRYPTO_ERROR;
3068: goto out;
3069: }
3070: rsa_p = rsa_q = NULL; /* transferred */
1.122 djm 3071: if ((r = sshkey_check_rsa_length(k, 0)) != 0)
1.69 djm 3072: goto out;
3073: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3074: goto out;
1.1 djm 3075: break;
3076: #endif /* WITH_OPENSSL */
3077: case KEY_ED25519:
1.108 djm 3078: case KEY_ED25519_CERT:
1.1 djm 3079: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3080: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3081: goto out;
3082: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3083: r = SSH_ERR_INVALID_FORMAT;
3084: goto out;
3085: }
3086: k->ed25519_pk = ed25519_pk;
3087: k->ed25519_sk = ed25519_sk;
1.84 djm 3088: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3089: break;
1.90 markus 3090: case KEY_ED25519_SK:
1.108 djm 3091: case KEY_ED25519_SK_CERT:
1.90 markus 3092: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3093: goto out;
3094: if (pklen != ED25519_PK_SZ) {
3095: r = SSH_ERR_INVALID_FORMAT;
3096: goto out;
3097: }
3098: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3099: (k->sk_reserved = sshbuf_new()) == NULL) {
3100: r = SSH_ERR_ALLOC_FAIL;
3101: goto out;
3102: }
3103: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3104: NULL)) != 0 ||
3105: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3106: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3107: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3108: goto out;
3109: k->ed25519_pk = ed25519_pk;
3110: ed25519_pk = NULL; /* transferred */
3111: break;
1.62 markus 3112: #ifdef WITH_XMSS
3113: case KEY_XMSS:
1.108 djm 3114: case KEY_XMSS_CERT:
1.62 markus 3115: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3116: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3117: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
1.110 markus 3118: goto out;
3119: if (type == KEY_XMSS &&
3120: (r = sshkey_xmss_init(k, xmss_name)) != 0)
1.62 markus 3121: goto out;
3122: if (pklen != sshkey_xmss_pklen(k) ||
3123: sklen != sshkey_xmss_sklen(k)) {
3124: r = SSH_ERR_INVALID_FORMAT;
3125: goto out;
3126: }
3127: k->xmss_pk = xmss_pk;
3128: k->xmss_sk = xmss_sk;
3129: xmss_pk = xmss_sk = NULL;
3130: /* optional internal state */
3131: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3132: goto out;
3133: break;
3134: #endif /* WITH_XMSS */
1.1 djm 3135: default:
3136: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3137: goto out;
3138: }
3139: #ifdef WITH_OPENSSL
3140: /* enable blinding */
3141: switch (k->type) {
3142: case KEY_RSA:
3143: case KEY_RSA_CERT:
3144: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3145: r = SSH_ERR_LIBCRYPTO_ERROR;
3146: goto out;
3147: }
3148: break;
3149: }
3150: #endif /* WITH_OPENSSL */
1.115 djm 3151: if ((expect_sk_application != NULL && (k->sk_application == NULL ||
3152: strcmp(expect_sk_application, k->sk_application) != 0)) ||
3153: (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
1.116 djm 3154: memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
1.115 djm 3155: r = SSH_ERR_KEY_CERT_MISMATCH;
3156: goto out;
3157: }
1.1 djm 3158: /* success */
3159: r = 0;
3160: if (kp != NULL) {
3161: *kp = k;
3162: k = NULL;
3163: }
3164: out:
3165: free(tname);
3166: free(curve);
3167: #ifdef WITH_OPENSSL
1.60 jsing 3168: BN_clear_free(exponent);
1.69 djm 3169: BN_clear_free(dsa_p);
3170: BN_clear_free(dsa_q);
3171: BN_clear_free(dsa_g);
3172: BN_clear_free(dsa_pub_key);
3173: BN_clear_free(dsa_priv_key);
3174: BN_clear_free(rsa_n);
3175: BN_clear_free(rsa_e);
3176: BN_clear_free(rsa_d);
3177: BN_clear_free(rsa_p);
3178: BN_clear_free(rsa_q);
3179: BN_clear_free(rsa_iqmp);
1.1 djm 3180: #endif /* WITH_OPENSSL */
3181: sshkey_free(k);
1.61 jsing 3182: freezero(ed25519_pk, pklen);
3183: freezero(ed25519_sk, sklen);
1.62 markus 3184: free(xmss_name);
3185: freezero(xmss_pk, pklen);
3186: freezero(xmss_sk, sklen);
1.115 djm 3187: free(expect_sk_application);
3188: free(expect_ed25519_pk);
1.1 djm 3189: return r;
3190: }
3191:
3192: #ifdef WITH_OPENSSL
3193: int
3194: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3195: {
3196: EC_POINT *nq = NULL;
1.93 djm 3197: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 3198: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3199:
3200: /*
3201: * NB. This assumes OpenSSL has already verified that the public
3202: * point lies on the curve. This is done by EC_POINT_oct2point()
3203: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3204: * reachable with public points not unmarshalled using
3205: * EC_POINT_oct2point then the caller will need to explicitly check.
3206: */
1.1 djm 3207:
3208: /*
3209: * We shouldn't ever hit this case because bignum_get_ecpoint()
3210: * refuses to load GF2m points.
3211: */
3212: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3213: NID_X9_62_prime_field)
3214: goto out;
3215:
3216: /* Q != infinity */
3217: if (EC_POINT_is_at_infinity(group, public))
3218: goto out;
3219:
1.93 djm 3220: if ((x = BN_new()) == NULL ||
3221: (y = BN_new()) == NULL ||
3222: (order = BN_new()) == NULL ||
3223: (tmp = BN_new()) == NULL) {
1.1 djm 3224: ret = SSH_ERR_ALLOC_FAIL;
3225: goto out;
3226: }
3227:
3228: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 3229: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 3230: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 3231: x, y, NULL) != 1) {
1.1 djm 3232: ret = SSH_ERR_LIBCRYPTO_ERROR;
3233: goto out;
3234: }
3235: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3236: BN_num_bits(y) <= BN_num_bits(order) / 2)
3237: goto out;
3238:
3239: /* nQ == infinity (n == order of subgroup) */
3240: if ((nq = EC_POINT_new(group)) == NULL) {
3241: ret = SSH_ERR_ALLOC_FAIL;
3242: goto out;
3243: }
1.93 djm 3244: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 3245: ret = SSH_ERR_LIBCRYPTO_ERROR;
3246: goto out;
3247: }
3248: if (EC_POINT_is_at_infinity(group, nq) != 1)
3249: goto out;
3250:
3251: /* x < order - 1, y < order - 1 */
3252: if (!BN_sub(tmp, order, BN_value_one())) {
3253: ret = SSH_ERR_LIBCRYPTO_ERROR;
3254: goto out;
3255: }
3256: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3257: goto out;
3258: ret = 0;
3259: out:
1.93 djm 3260: BN_clear_free(x);
3261: BN_clear_free(y);
3262: BN_clear_free(order);
3263: BN_clear_free(tmp);
1.60 jsing 3264: EC_POINT_free(nq);
1.1 djm 3265: return ret;
3266: }
3267:
3268: int
3269: sshkey_ec_validate_private(const EC_KEY *key)
3270: {
1.93 djm 3271: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3272: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3273:
1.93 djm 3274: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3275: ret = SSH_ERR_ALLOC_FAIL;
3276: goto out;
3277: }
3278:
3279: /* log2(private) > log2(order)/2 */
1.93 djm 3280: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3281: ret = SSH_ERR_LIBCRYPTO_ERROR;
3282: goto out;
3283: }
3284: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3285: BN_num_bits(order) / 2)
3286: goto out;
3287:
3288: /* private < order - 1 */
3289: if (!BN_sub(tmp, order, BN_value_one())) {
3290: ret = SSH_ERR_LIBCRYPTO_ERROR;
3291: goto out;
3292: }
3293: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3294: goto out;
3295: ret = 0;
3296: out:
1.93 djm 3297: BN_clear_free(order);
3298: BN_clear_free(tmp);
1.1 djm 3299: return ret;
3300: }
3301:
3302: void
3303: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3304: {
1.93 djm 3305: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3306:
3307: if (point == NULL) {
3308: fputs("point=(NULL)\n", stderr);
3309: return;
3310: }
1.93 djm 3311: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3312: fprintf(stderr, "%s: BN_new failed\n", __func__);
3313: goto out;
1.1 djm 3314: }
3315: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3316: NID_X9_62_prime_field) {
3317: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3318: goto out;
1.1 djm 3319: }
1.93 djm 3320: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3321: x, y, NULL) != 1) {
1.1 djm 3322: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3323: __func__);
1.93 djm 3324: goto out;
1.1 djm 3325: }
3326: fputs("x=", stderr);
3327: BN_print_fp(stderr, x);
3328: fputs("\ny=", stderr);
3329: BN_print_fp(stderr, y);
3330: fputs("\n", stderr);
1.93 djm 3331: out:
3332: BN_clear_free(x);
3333: BN_clear_free(y);
1.1 djm 3334: }
3335:
3336: void
3337: sshkey_dump_ec_key(const EC_KEY *key)
3338: {
3339: const BIGNUM *exponent;
3340:
3341: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3342: EC_KEY_get0_public_key(key));
3343: fputs("exponent=", stderr);
3344: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3345: fputs("(NULL)", stderr);
3346: else
3347: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3348: fputs("\n", stderr);
3349: }
3350: #endif /* WITH_OPENSSL */
3351:
3352: static int
1.76 djm 3353: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3354: const char *passphrase, const char *comment, const char *ciphername,
3355: int rounds)
3356: {
1.4 djm 3357: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3358: u_char salt[SALT_LEN];
1.4 djm 3359: char *b64 = NULL;
1.1 djm 3360: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3361: u_int check;
3362: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3363: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3364: const struct sshcipher *cipher;
3365: const char *kdfname = KDFNAME;
3366: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3367:
3368: if (rounds <= 0)
3369: rounds = DEFAULT_ROUNDS;
3370: if (passphrase == NULL || !strlen(passphrase)) {
3371: ciphername = "none";
3372: kdfname = "none";
3373: } else if (ciphername == NULL)
3374: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3375: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3376: r = SSH_ERR_INVALID_ARGUMENT;
3377: goto out;
3378: }
3379:
3380: if ((kdf = sshbuf_new()) == NULL ||
3381: (encoded = sshbuf_new()) == NULL ||
3382: (encrypted = sshbuf_new()) == NULL) {
3383: r = SSH_ERR_ALLOC_FAIL;
3384: goto out;
3385: }
3386: blocksize = cipher_blocksize(cipher);
3387: keylen = cipher_keylen(cipher);
3388: ivlen = cipher_ivlen(cipher);
3389: authlen = cipher_authlen(cipher);
3390: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3391: r = SSH_ERR_ALLOC_FAIL;
3392: goto out;
3393: }
3394: if (strcmp(kdfname, "bcrypt") == 0) {
3395: arc4random_buf(salt, SALT_LEN);
3396: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3397: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3398: r = SSH_ERR_INVALID_ARGUMENT;
3399: goto out;
3400: }
3401: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3402: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3403: goto out;
3404: } else if (strcmp(kdfname, "none") != 0) {
3405: /* Unsupported KDF type */
3406: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3407: goto out;
3408: }
3409: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3410: key + keylen, ivlen, 1)) != 0)
3411: goto out;
3412:
3413: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3414: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3415: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3416: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3417: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3418: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3419: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3420: goto out;
3421:
3422: /* set up the buffer that will be encrypted */
3423:
3424: /* Random check bytes */
3425: check = arc4random();
3426: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3427: (r = sshbuf_put_u32(encrypted, check)) != 0)
3428: goto out;
3429:
3430: /* append private key and comment*/
1.62 markus 3431: if ((r = sshkey_private_serialize_opt(prv, encrypted,
1.116 djm 3432: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3433: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3434: goto out;
3435:
3436: /* padding */
3437: i = 0;
3438: while (sshbuf_len(encrypted) % blocksize) {
3439: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3440: goto out;
3441: }
3442:
3443: /* length in destination buffer */
3444: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3445: goto out;
3446:
3447: /* encrypt */
3448: if ((r = sshbuf_reserve(encoded,
3449: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3450: goto out;
1.36 djm 3451: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3452: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3453: goto out;
3454:
1.81 djm 3455: sshbuf_reset(blob);
1.1 djm 3456:
1.81 djm 3457: /* assemble uuencoded key */
3458: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3459: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3460: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3461: goto out;
3462:
3463: /* success */
3464: r = 0;
3465:
3466: out:
3467: sshbuf_free(kdf);
3468: sshbuf_free(encoded);
3469: sshbuf_free(encrypted);
1.36 djm 3470: cipher_free(ciphercontext);
1.1 djm 3471: explicit_bzero(salt, sizeof(salt));
1.100 jsg 3472: if (key != NULL)
3473: freezero(key, keylen + ivlen);
1.121 djm 3474: if (pubkeyblob != NULL)
1.100 jsg 3475: freezero(pubkeyblob, pubkeylen);
1.121 djm 3476: if (b64 != NULL)
1.100 jsg 3477: freezero(b64, strlen(b64));
1.1 djm 3478: return r;
3479: }
3480:
3481: static int
1.103 djm 3482: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 3483: {
3484: const u_char *cp;
3485: size_t encoded_len;
1.103 djm 3486: int r;
3487: u_char last;
1.1 djm 3488: struct sshbuf *encoded = NULL, *decoded = NULL;
3489:
1.103 djm 3490: if (blob == NULL || decodedp == NULL)
3491: return SSH_ERR_INVALID_ARGUMENT;
3492:
3493: *decodedp = NULL;
1.1 djm 3494:
3495: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 3496: (decoded = sshbuf_new()) == NULL) {
1.1 djm 3497: r = SSH_ERR_ALLOC_FAIL;
3498: goto out;
3499: }
3500:
3501: /* check preamble */
3502: cp = sshbuf_ptr(blob);
3503: encoded_len = sshbuf_len(blob);
3504: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3505: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3506: r = SSH_ERR_INVALID_FORMAT;
3507: goto out;
3508: }
3509: cp += MARK_BEGIN_LEN;
3510: encoded_len -= MARK_BEGIN_LEN;
3511:
3512: /* Look for end marker, removing whitespace as we go */
3513: while (encoded_len > 0) {
3514: if (*cp != '\n' && *cp != '\r') {
3515: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3516: goto out;
3517: }
3518: last = *cp;
3519: encoded_len--;
3520: cp++;
3521: if (last == '\n') {
3522: if (encoded_len >= MARK_END_LEN &&
3523: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3524: /* \0 terminate */
3525: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3526: goto out;
3527: break;
3528: }
3529: }
3530: }
3531: if (encoded_len == 0) {
3532: r = SSH_ERR_INVALID_FORMAT;
3533: goto out;
3534: }
3535:
3536: /* decode base64 */
1.4 djm 3537: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3538: goto out;
3539:
3540: /* check magic */
3541: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3542: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3543: r = SSH_ERR_INVALID_FORMAT;
3544: goto out;
3545: }
1.103 djm 3546: /* success */
3547: *decodedp = decoded;
3548: decoded = NULL;
3549: r = 0;
3550: out:
3551: sshbuf_free(encoded);
3552: sshbuf_free(decoded);
3553: return r;
3554: }
3555:
3556: static int
1.104 djm 3557: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
3558: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 3559: {
3560: char *ciphername = NULL, *kdfname = NULL;
3561: const struct sshcipher *cipher = NULL;
3562: int r = SSH_ERR_INTERNAL_ERROR;
3563: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3564: struct sshbuf *kdf = NULL, *decrypted = NULL;
3565: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 3566: struct sshkey *pubkey = NULL;
1.103 djm 3567: u_char *key = NULL, *salt = NULL, *dp;
3568: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3569:
1.104 djm 3570: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 3571: return SSH_ERR_INVALID_ARGUMENT;
3572:
3573: *decryptedp = NULL;
1.104 djm 3574: *pubkeyp = NULL;
1.103 djm 3575:
3576: if ((decrypted = sshbuf_new()) == NULL) {
3577: r = SSH_ERR_ALLOC_FAIL;
3578: goto out;
3579: }
3580:
1.1 djm 3581: /* parse public portion of key */
3582: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3583: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3584: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3585: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 3586: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3587: goto out;
3588:
3589: if (nkeys != 1) {
3590: /* XXX only one key supported at present */
3591: r = SSH_ERR_INVALID_FORMAT;
3592: goto out;
3593: }
3594:
1.104 djm 3595: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 3596: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3597: goto out;
3598:
3599: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3600: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3601: goto out;
3602: }
3603: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3604: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3605: goto out;
3606: }
1.101 markus 3607: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 3608: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 3609: goto out;
3610: }
3611: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3612: strcmp(kdfname, "none") != 0) {
3613: /* passphrase required */
3614: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 3615: goto out;
3616: }
3617:
3618: /* check size of encrypted key blob */
3619: blocksize = cipher_blocksize(cipher);
3620: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3621: r = SSH_ERR_INVALID_FORMAT;
3622: goto out;
3623: }
3624:
3625: /* setup key */
3626: keylen = cipher_keylen(cipher);
3627: ivlen = cipher_ivlen(cipher);
1.18 djm 3628: authlen = cipher_authlen(cipher);
1.1 djm 3629: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3630: r = SSH_ERR_ALLOC_FAIL;
3631: goto out;
3632: }
3633: if (strcmp(kdfname, "bcrypt") == 0) {
3634: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3635: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3636: goto out;
3637: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3638: key, keylen + ivlen, rounds) < 0) {
3639: r = SSH_ERR_INVALID_FORMAT;
3640: goto out;
3641: }
3642: }
3643:
1.18 djm 3644: /* check that an appropriate amount of auth data is present */
1.84 djm 3645: if (sshbuf_len(decoded) < authlen ||
3646: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 3647: r = SSH_ERR_INVALID_FORMAT;
3648: goto out;
3649: }
3650:
1.1 djm 3651: /* decrypt private portion of key */
3652: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3653: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3654: key + keylen, ivlen, 0)) != 0)
3655: goto out;
1.36 djm 3656: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3657: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3658: /* an integrity error here indicates an incorrect passphrase */
3659: if (r == SSH_ERR_MAC_INVALID)
3660: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3661: goto out;
3662: }
1.18 djm 3663: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3664: goto out;
3665: /* there should be no trailing data */
3666: if (sshbuf_len(decoded) != 0) {
3667: r = SSH_ERR_INVALID_FORMAT;
3668: goto out;
3669: }
3670:
3671: /* check check bytes */
3672: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3673: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3674: goto out;
3675: if (check1 != check2) {
3676: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3677: goto out;
3678: }
1.103 djm 3679: /* success */
3680: *decryptedp = decrypted;
3681: decrypted = NULL;
1.104 djm 3682: *pubkeyp = pubkey;
3683: pubkey = NULL;
1.103 djm 3684: r = 0;
3685: out:
3686: cipher_free(ciphercontext);
3687: free(ciphername);
3688: free(kdfname);
1.104 djm 3689: sshkey_free(pubkey);
1.103 djm 3690: if (salt != NULL) {
3691: explicit_bzero(salt, slen);
3692: free(salt);
3693: }
3694: if (key != NULL) {
3695: explicit_bzero(key, keylen + ivlen);
3696: free(key);
3697: }
3698: sshbuf_free(kdf);
3699: sshbuf_free(decrypted);
3700: return r;
3701: }
3702:
3703: static int
3704: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3705: struct sshkey **keyp, char **commentp)
3706: {
3707: char *comment = NULL;
3708: int r = SSH_ERR_INTERNAL_ERROR;
3709: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 3710: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 3711:
3712: if (keyp != NULL)
3713: *keyp = NULL;
3714: if (commentp != NULL)
3715: *commentp = NULL;
3716:
3717: /* Undo base64 encoding and decrypt the private section */
3718: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 3719: (r = private2_decrypt(decoded, passphrase,
3720: &decrypted, &pubkey)) != 0)
1.103 djm 3721: goto out;
1.105 djm 3722:
3723: if (type != KEY_UNSPEC &&
3724: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3725: r = SSH_ERR_KEY_TYPE_MISMATCH;
3726: goto out;
3727: }
1.103 djm 3728:
3729: /* Load the private key and comment */
3730: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3731: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3732: goto out;
3733:
3734: /* Check deterministic padding after private section */
3735: if ((r = private2_check_padding(decrypted)) != 0)
3736: goto out;
1.1 djm 3737:
1.104 djm 3738: /* Check that the public key in the envelope matches the private key */
3739: if (!sshkey_equal(pubkey, k)) {
3740: r = SSH_ERR_INVALID_FORMAT;
3741: goto out;
3742: }
1.1 djm 3743:
3744: /* success */
3745: r = 0;
3746: if (keyp != NULL) {
3747: *keyp = k;
3748: k = NULL;
3749: }
3750: if (commentp != NULL) {
3751: *commentp = comment;
3752: comment = NULL;
3753: }
3754: out:
3755: free(comment);
3756: sshbuf_free(decoded);
3757: sshbuf_free(decrypted);
3758: sshkey_free(k);
1.104 djm 3759: sshkey_free(pubkey);
1.1 djm 3760: return r;
3761: }
3762:
1.107 djm 3763: static int
3764: sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3765: struct sshkey **keyp)
3766: {
3767: int r = SSH_ERR_INTERNAL_ERROR;
3768: struct sshbuf *decoded = NULL;
3769: struct sshkey *pubkey = NULL;
3770: u_int nkeys = 0;
3771:
3772: if (keyp != NULL)
3773: *keyp = NULL;
3774:
3775: if ((r = private2_uudecode(blob, &decoded)) != 0)
3776: goto out;
3777: /* parse public key from unencrypted envelope */
3778: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3779: (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
3780: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
3781: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
3782: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3783: goto out;
3784:
3785: if (nkeys != 1) {
3786: /* XXX only one key supported at present */
3787: r = SSH_ERR_INVALID_FORMAT;
3788: goto out;
3789: }
3790:
3791: /* Parse the public key */
3792: if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3793: goto out;
3794:
3795: if (type != KEY_UNSPEC &&
3796: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3797: r = SSH_ERR_KEY_TYPE_MISMATCH;
3798: goto out;
3799: }
3800:
3801: /* success */
3802: r = 0;
3803: if (keyp != NULL) {
3804: *keyp = pubkey;
3805: pubkey = NULL;
3806: }
3807: out:
3808: sshbuf_free(decoded);
3809: sshkey_free(pubkey);
3810: return r;
3811: }
3812:
1.1 djm 3813: #ifdef WITH_OPENSSL
1.80 djm 3814: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3815: static int
1.80 djm 3816: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3817: int format, const char *_passphrase, const char *comment)
1.1 djm 3818: {
1.76 djm 3819: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3820: int success, r;
3821: int blen, len = strlen(_passphrase);
3822: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3823: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3824: char *bptr;
1.1 djm 3825: BIO *bio = NULL;
1.76 djm 3826: struct sshbuf *blob;
1.80 djm 3827: EVP_PKEY *pkey = NULL;
1.1 djm 3828:
3829: if (len > 0 && len <= 4)
3830: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3831: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3832: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3833: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3834: r = SSH_ERR_ALLOC_FAIL;
3835: goto out;
3836: }
3837: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3838: r = SSH_ERR_ALLOC_FAIL;
3839: goto out;
1.76 djm 3840: }
3841: if ((r = sshkey_unshield_private(key)) != 0)
3842: goto out;
1.1 djm 3843:
3844: switch (key->type) {
3845: case KEY_DSA:
1.80 djm 3846: if (format == SSHKEY_PRIVATE_PEM) {
3847: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3848: cipher, passphrase, len, NULL, NULL);
3849: } else {
3850: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3851: }
1.1 djm 3852: break;
3853: case KEY_ECDSA:
1.80 djm 3854: if (format == SSHKEY_PRIVATE_PEM) {
3855: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3856: cipher, passphrase, len, NULL, NULL);
3857: } else {
3858: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3859: }
1.1 djm 3860: break;
3861: case KEY_RSA:
1.80 djm 3862: if (format == SSHKEY_PRIVATE_PEM) {
3863: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3864: cipher, passphrase, len, NULL, NULL);
3865: } else {
3866: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3867: }
1.1 djm 3868: break;
3869: default:
3870: success = 0;
3871: break;
3872: }
3873: if (success == 0) {
3874: r = SSH_ERR_LIBCRYPTO_ERROR;
3875: goto out;
3876: }
1.80 djm 3877: if (format == SSHKEY_PRIVATE_PKCS8) {
3878: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3879: passphrase, len, NULL, NULL)) == 0) {
3880: r = SSH_ERR_LIBCRYPTO_ERROR;
3881: goto out;
3882: }
3883: }
1.1 djm 3884: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3885: r = SSH_ERR_INTERNAL_ERROR;
3886: goto out;
3887: }
3888: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3889: goto out;
3890: r = 0;
3891: out:
1.76 djm 3892: if (was_shielded)
3893: r = sshkey_shield_private(key);
3894: if (r == 0)
3895: r = sshbuf_putb(buf, blob);
1.80 djm 3896:
3897: EVP_PKEY_free(pkey);
1.76 djm 3898: sshbuf_free(blob);
1.1 djm 3899: BIO_free(bio);
3900: return r;
3901: }
3902: #endif /* WITH_OPENSSL */
3903:
3904: /* Serialise "key" to buffer "blob" */
3905: int
3906: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3907: const char *passphrase, const char *comment,
1.80 djm 3908: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 3909: {
3910: switch (key->type) {
1.9 markus 3911: #ifdef WITH_OPENSSL
1.1 djm 3912: case KEY_DSA:
3913: case KEY_ECDSA:
3914: case KEY_RSA:
1.80 djm 3915: break; /* see below */
1.1 djm 3916: #endif /* WITH_OPENSSL */
3917: case KEY_ED25519:
1.90 markus 3918: case KEY_ED25519_SK:
1.62 markus 3919: #ifdef WITH_XMSS
3920: case KEY_XMSS:
3921: #endif /* WITH_XMSS */
1.85 djm 3922: #ifdef WITH_OPENSSL
3923: case KEY_ECDSA_SK:
3924: #endif /* WITH_OPENSSL */
1.1 djm 3925: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 3926: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 3927: default:
3928: return SSH_ERR_KEY_TYPE_UNKNOWN;
3929: }
1.80 djm 3930:
3931: #ifdef WITH_OPENSSL
3932: switch (format) {
3933: case SSHKEY_PRIVATE_OPENSSH:
3934: return sshkey_private_to_blob2(key, blob, passphrase,
3935: comment, openssh_format_cipher, openssh_format_rounds);
3936: case SSHKEY_PRIVATE_PEM:
3937: case SSHKEY_PRIVATE_PKCS8:
3938: return sshkey_private_to_blob_pem_pkcs8(key, blob,
3939: format, passphrase, comment);
3940: default:
3941: return SSH_ERR_INVALID_ARGUMENT;
3942: }
3943: #endif /* WITH_OPENSSL */
1.1 djm 3944: }
3945:
3946: #ifdef WITH_OPENSSL
1.8 djm 3947: static int
1.52 djm 3948: translate_libcrypto_error(unsigned long pem_err)
3949: {
3950: int pem_reason = ERR_GET_REASON(pem_err);
3951:
3952: switch (ERR_GET_LIB(pem_err)) {
3953: case ERR_LIB_PEM:
3954: switch (pem_reason) {
3955: case PEM_R_BAD_PASSWORD_READ:
3956: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3957: case PEM_R_BAD_DECRYPT:
3958: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3959: default:
3960: return SSH_ERR_INVALID_FORMAT;
3961: }
3962: case ERR_LIB_EVP:
3963: switch (pem_reason) {
3964: case EVP_R_BAD_DECRYPT:
3965: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3966: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3967: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3968: #endif
1.52 djm 3969: case EVP_R_DECODE_ERROR:
3970: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3971: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3972: #endif
3973: return SSH_ERR_INVALID_FORMAT;
3974: default:
3975: return SSH_ERR_LIBCRYPTO_ERROR;
3976: }
3977: case ERR_LIB_ASN1:
3978: return SSH_ERR_INVALID_FORMAT;
3979: }
3980: return SSH_ERR_LIBCRYPTO_ERROR;
3981: }
3982:
3983: static void
3984: clear_libcrypto_errors(void)
3985: {
3986: while (ERR_get_error() != 0)
3987: ;
3988: }
3989:
3990: /*
3991: * Translate OpenSSL error codes to determine whether
3992: * passphrase is required/incorrect.
3993: */
3994: static int
3995: convert_libcrypto_error(void)
3996: {
3997: /*
3998: * Some password errors are reported at the beginning
3999: * of the error queue.
4000: */
4001: if (translate_libcrypto_error(ERR_peek_error()) ==
4002: SSH_ERR_KEY_WRONG_PASSPHRASE)
4003: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4004: return translate_libcrypto_error(ERR_peek_last_error());
4005: }
4006:
4007: static int
1.1 djm 4008: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4009: const char *passphrase, struct sshkey **keyp)
1.1 djm 4010: {
4011: EVP_PKEY *pk = NULL;
4012: struct sshkey *prv = NULL;
4013: BIO *bio = NULL;
4014: int r;
4015:
1.32 djm 4016: if (keyp != NULL)
4017: *keyp = NULL;
1.1 djm 4018:
4019: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4020: return SSH_ERR_ALLOC_FAIL;
4021: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4022: (int)sshbuf_len(blob)) {
4023: r = SSH_ERR_ALLOC_FAIL;
4024: goto out;
4025: }
4026:
1.52 djm 4027: clear_libcrypto_errors();
1.1 djm 4028: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4029: (char *)passphrase)) == NULL) {
1.116 djm 4030: /*
4031: * libcrypto may return various ASN.1 errors when attempting
4032: * to parse a key with an incorrect passphrase.
4033: * Treat all format errors as "incorrect passphrase" if a
4034: * passphrase was supplied.
4035: */
1.71 djm 4036: if (passphrase != NULL && *passphrase != '\0')
4037: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4038: else
4039: r = convert_libcrypto_error();
1.1 djm 4040: goto out;
4041: }
1.69 djm 4042: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4043: (type == KEY_UNSPEC || type == KEY_RSA)) {
4044: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4045: r = SSH_ERR_ALLOC_FAIL;
4046: goto out;
4047: }
4048: prv->rsa = EVP_PKEY_get1_RSA(pk);
4049: prv->type = KEY_RSA;
4050: #ifdef DEBUG_PK
4051: RSA_print_fp(stderr, prv->rsa, 8);
4052: #endif
4053: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4054: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4055: goto out;
4056: }
1.122 djm 4057: if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
1.1 djm 4058: goto out;
1.69 djm 4059: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4060: (type == KEY_UNSPEC || type == KEY_DSA)) {
4061: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4062: r = SSH_ERR_ALLOC_FAIL;
4063: goto out;
4064: }
4065: prv->dsa = EVP_PKEY_get1_DSA(pk);
4066: prv->type = KEY_DSA;
4067: #ifdef DEBUG_PK
4068: DSA_print_fp(stderr, prv->dsa, 8);
4069: #endif
1.69 djm 4070: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4071: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4072: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4073: r = SSH_ERR_ALLOC_FAIL;
4074: goto out;
4075: }
4076: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4077: prv->type = KEY_ECDSA;
4078: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4079: if (prv->ecdsa_nid == -1 ||
4080: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4081: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4082: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4083: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4084: r = SSH_ERR_INVALID_FORMAT;
4085: goto out;
4086: }
4087: #ifdef DEBUG_PK
4088: if (prv != NULL && prv->ecdsa != NULL)
4089: sshkey_dump_ec_key(prv->ecdsa);
4090: #endif
4091: } else {
4092: r = SSH_ERR_INVALID_FORMAT;
4093: goto out;
4094: }
4095: r = 0;
1.32 djm 4096: if (keyp != NULL) {
4097: *keyp = prv;
4098: prv = NULL;
4099: }
1.1 djm 4100: out:
4101: BIO_free(bio);
1.60 jsing 4102: EVP_PKEY_free(pk);
1.30 mmcc 4103: sshkey_free(prv);
1.1 djm 4104: return r;
4105: }
4106: #endif /* WITH_OPENSSL */
4107:
4108: int
4109: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4110: const char *passphrase, struct sshkey **keyp, char **commentp)
4111: {
1.42 djm 4112: int r = SSH_ERR_INTERNAL_ERROR;
4113:
1.32 djm 4114: if (keyp != NULL)
4115: *keyp = NULL;
1.1 djm 4116: if (commentp != NULL)
4117: *commentp = NULL;
4118:
4119: switch (type) {
4120: case KEY_ED25519:
1.62 markus 4121: case KEY_XMSS:
1.106 djm 4122: /* No fallback for new-format-only keys */
1.1 djm 4123: return sshkey_parse_private2(blob, type, passphrase,
4124: keyp, commentp);
1.106 djm 4125: default:
1.42 djm 4126: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4127: commentp);
1.106 djm 4128: /* Only fallback to PEM parser if a format error occurred. */
4129: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 4130: return r;
1.1 djm 4131: #ifdef WITH_OPENSSL
1.8 djm 4132: return sshkey_parse_private_pem_fileblob(blob, type,
4133: passphrase, keyp);
1.1 djm 4134: #else
4135: return SSH_ERR_INVALID_FORMAT;
4136: #endif /* WITH_OPENSSL */
4137: }
4138: }
4139:
4140: int
4141: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4142: struct sshkey **keyp, char **commentp)
1.1 djm 4143: {
4144: if (keyp != NULL)
4145: *keyp = NULL;
4146: if (commentp != NULL)
4147: *commentp = NULL;
4148:
1.23 tim 4149: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4150: passphrase, keyp, commentp);
1.96 djm 4151: }
4152:
4153: void
4154: sshkey_sig_details_free(struct sshkey_sig_details *details)
4155: {
4156: freezero(details, sizeof(*details));
1.107 djm 4157: }
4158:
4159: int
4160: sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
4161: struct sshkey **pubkeyp)
4162: {
4163: int r = SSH_ERR_INTERNAL_ERROR;
4164:
4165: if (pubkeyp != NULL)
4166: *pubkeyp = NULL;
4167: /* only new-format private keys bundle a public key inside */
4168: if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
4169: return r;
4170: return 0;
1.1 djm 4171: }
1.62 markus 4172:
4173: #ifdef WITH_XMSS
4174: /*
4175: * serialize the key with the current state and forward the state
4176: * maxsign times.
4177: */
4178: int
1.77 djm 4179: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 4180: u_int32_t maxsign, int printerror)
1.62 markus 4181: {
4182: int r, rupdate;
4183:
4184: if (maxsign == 0 ||
4185: sshkey_type_plain(k->type) != KEY_XMSS)
4186: return sshkey_private_serialize_opt(k, b,
4187: SSHKEY_SERIALIZE_DEFAULT);
1.112 dtucker 4188: if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
1.62 markus 4189: (r = sshkey_private_serialize_opt(k, b,
4190: SSHKEY_SERIALIZE_STATE)) != 0 ||
4191: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4192: goto out;
4193: r = 0;
4194: out:
1.112 dtucker 4195: if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
1.62 markus 4196: if (r == 0)
4197: r = rupdate;
4198: }
4199: return r;
4200: }
4201:
4202: u_int32_t
4203: sshkey_signatures_left(const struct sshkey *k)
4204: {
4205: if (sshkey_type_plain(k->type) == KEY_XMSS)
4206: return sshkey_xmss_signatures_left(k);
4207: return 0;
4208: }
4209:
4210: int
4211: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4212: {
4213: if (sshkey_type_plain(k->type) != KEY_XMSS)
4214: return SSH_ERR_INVALID_ARGUMENT;
4215: return sshkey_xmss_enable_maxsign(k, maxsign);
4216: }
4217:
4218: int
4219: sshkey_set_filename(struct sshkey *k, const char *filename)
4220: {
4221: if (k == NULL)
4222: return SSH_ERR_INVALID_ARGUMENT;
4223: if (sshkey_type_plain(k->type) != KEY_XMSS)
4224: return 0;
4225: if (filename == NULL)
4226: return SSH_ERR_INVALID_ARGUMENT;
4227: if ((k->xmss_filename = strdup(filename)) == NULL)
4228: return SSH_ERR_ALLOC_FAIL;
4229: return 0;
4230: }
4231: #else
4232: int
1.76 djm 4233: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 4234: u_int32_t maxsign, int printerror)
1.62 markus 4235: {
4236: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4237: }
4238:
4239: u_int32_t
4240: sshkey_signatures_left(const struct sshkey *k)
4241: {
4242: return 0;
4243: }
4244:
4245: int
4246: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4247: {
4248: return SSH_ERR_INVALID_ARGUMENT;
4249: }
4250:
4251: int
4252: sshkey_set_filename(struct sshkey *k, const char *filename)
4253: {
4254: if (k == NULL)
4255: return SSH_ERR_INVALID_ARGUMENT;
4256: return 0;
4257: }
4258: #endif /* WITH_XMSS */
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