Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.134
1.134 ! djm 1: /* $OpenBSD: sshkey.c,v 1.133 2022/10/28 00:44:44 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4: * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5: * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/types.h>
1.7 djm 29: #include <netinet/in.h>
1.1 djm 30:
1.12 djm 31: #ifdef WITH_OPENSSL
1.1 djm 32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
1.12 djm 35: #endif
1.1 djm 36:
37: #include "crypto_api.h"
38:
39: #include <errno.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <util.h>
1.13 deraadt 43: #include <limits.h>
1.7 djm 44: #include <resolv.h>
1.1 djm 45:
46: #include "ssh2.h"
47: #include "ssherr.h"
48: #include "misc.h"
49: #include "sshbuf.h"
50: #include "cipher.h"
51: #include "digest.h"
52: #define SSHKEY_INTERNAL
53: #include "sshkey.h"
1.11 djm 54: #include "match.h"
1.86 djm 55: #include "ssh-sk.h"
1.1 djm 56:
1.74 dtucker 57: #ifdef WITH_XMSS
58: #include "sshkey-xmss.h"
1.62 markus 59: #include "xmss_fast.h"
1.74 dtucker 60: #endif
1.62 markus 61:
1.1 djm 62: /* openssh private key file format */
63: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
64: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
65: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
66: #define MARK_END_LEN (sizeof(MARK_END) - 1)
67: #define KDFNAME "bcrypt"
68: #define AUTH_MAGIC "openssh-key-v1"
69: #define SALT_LEN 16
1.56 djm 70: #define DEFAULT_CIPHERNAME "aes256-ctr"
1.1 djm 71: #define DEFAULT_ROUNDS 16
72:
73: /* Version identification string for SSH v1 identity files. */
74: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
75:
1.76 djm 76: /*
77: * Constants relating to "shielding" support; protection of keys expected
78: * to remain in memory for long durations
79: */
80: #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024)
81: #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */
82: #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512
83:
84: int sshkey_private_serialize_opt(struct sshkey *key,
1.62 markus 85: struct sshbuf *buf, enum sshkey_serialize_rep);
1.14 djm 86: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 87: struct sshkey **keyp, int allow_cert);
88:
89: /* Supported key types */
1.123 djm 90: extern const struct sshkey_impl sshkey_ed25519_impl;
91: extern const struct sshkey_impl sshkey_ed25519_cert_impl;
92: extern const struct sshkey_impl sshkey_ed25519_sk_impl;
93: extern const struct sshkey_impl sshkey_ed25519_sk_cert_impl;
94: #ifdef WITH_OPENSSL
95: extern const struct sshkey_impl sshkey_ecdsa_sk_impl;
96: extern const struct sshkey_impl sshkey_ecdsa_sk_cert_impl;
97: extern const struct sshkey_impl sshkey_ecdsa_sk_webauthn_impl;
98: extern const struct sshkey_impl sshkey_ecdsa_nistp256_impl;
99: extern const struct sshkey_impl sshkey_ecdsa_nistp256_cert_impl;
100: extern const struct sshkey_impl sshkey_ecdsa_nistp384_impl;
101: extern const struct sshkey_impl sshkey_ecdsa_nistp384_cert_impl;
102: extern const struct sshkey_impl sshkey_ecdsa_nistp521_impl;
103: extern const struct sshkey_impl sshkey_ecdsa_nistp521_cert_impl;
104: extern const struct sshkey_impl sshkey_rsa_impl;
105: extern const struct sshkey_impl sshkey_rsa_cert_impl;
106: extern const struct sshkey_impl sshkey_rsa_sha256_impl;
107: extern const struct sshkey_impl sshkey_rsa_sha256_cert_impl;
108: extern const struct sshkey_impl sshkey_rsa_sha512_impl;
109: extern const struct sshkey_impl sshkey_rsa_sha512_cert_impl;
110: extern const struct sshkey_impl sshkey_dss_impl;
111: extern const struct sshkey_impl sshkey_dsa_cert_impl;
112: #endif /* WITH_OPENSSL */
1.62 markus 113: #ifdef WITH_XMSS
1.123 djm 114: extern const struct sshkey_impl sshkey_xmss_impl;
115: extern const struct sshkey_impl sshkey_xmss_cert_impl;
116: #endif
117:
118: const struct sshkey_impl * const keyimpls[] = {
119: &sshkey_ed25519_impl,
120: &sshkey_ed25519_cert_impl,
121: &sshkey_ed25519_sk_impl,
122: &sshkey_ed25519_sk_cert_impl,
123: #ifdef WITH_OPENSSL
124: &sshkey_ecdsa_nistp256_impl,
125: &sshkey_ecdsa_nistp256_cert_impl,
126: &sshkey_ecdsa_nistp384_impl,
127: &sshkey_ecdsa_nistp384_cert_impl,
128: &sshkey_ecdsa_nistp521_impl,
129: &sshkey_ecdsa_nistp521_cert_impl,
130: &sshkey_ecdsa_sk_impl,
131: &sshkey_ecdsa_sk_cert_impl,
132: &sshkey_ecdsa_sk_webauthn_impl,
133: &sshkey_dss_impl,
134: &sshkey_dsa_cert_impl,
135: &sshkey_rsa_impl,
136: &sshkey_rsa_cert_impl,
137: &sshkey_rsa_sha256_impl,
138: &sshkey_rsa_sha256_cert_impl,
139: &sshkey_rsa_sha512_impl,
140: &sshkey_rsa_sha512_cert_impl,
1.1 djm 141: #endif /* WITH_OPENSSL */
1.123 djm 142: #ifdef WITH_XMSS
143: &sshkey_xmss_impl,
144: &sshkey_xmss_cert_impl,
145: #endif
146: NULL
1.1 djm 147: };
148:
1.123 djm 149: static const struct sshkey_impl *
150: sshkey_impl_from_type(int type)
151: {
152: int i;
153:
154: for (i = 0; keyimpls[i] != NULL; i++) {
155: if (keyimpls[i]->type == type)
156: return keyimpls[i];
157: }
158: return NULL;
159: }
160:
161: static const struct sshkey_impl *
162: sshkey_impl_from_type_nid(int type, int nid)
163: {
164: int i;
165:
166: for (i = 0; keyimpls[i] != NULL; i++) {
167: if (keyimpls[i]->type == type &&
168: (keyimpls[i]->nid == 0 || keyimpls[i]->nid == nid))
169: return keyimpls[i];
170: }
171: return NULL;
172: }
173:
1.126 djm 174: static const struct sshkey_impl *
175: sshkey_impl_from_key(const struct sshkey *k)
176: {
177: if (k == NULL)
178: return NULL;
179: return sshkey_impl_from_type_nid(k->type, k->ecdsa_nid);
180: }
181:
1.1 djm 182: const char *
183: sshkey_type(const struct sshkey *k)
184: {
1.123 djm 185: const struct sshkey_impl *impl;
1.1 djm 186:
1.126 djm 187: if ((impl = sshkey_impl_from_key(k)) == NULL)
1.123 djm 188: return "unknown";
189: return impl->shortname;
1.1 djm 190: }
191:
192: static const char *
193: sshkey_ssh_name_from_type_nid(int type, int nid)
194: {
1.123 djm 195: const struct sshkey_impl *impl;
1.1 djm 196:
1.123 djm 197: if ((impl = sshkey_impl_from_type_nid(type, nid)) == NULL)
198: return "ssh-unknown";
199: return impl->name;
1.1 djm 200: }
201:
202: int
203: sshkey_type_is_cert(int type)
204: {
1.123 djm 205: const struct sshkey_impl *impl;
1.1 djm 206:
1.123 djm 207: if ((impl = sshkey_impl_from_type(type)) == NULL)
208: return 0;
209: return impl->cert;
1.1 djm 210: }
211:
212: const char *
213: sshkey_ssh_name(const struct sshkey *k)
214: {
215: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
216: }
217:
218: const char *
219: sshkey_ssh_name_plain(const struct sshkey *k)
220: {
221: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
222: k->ecdsa_nid);
223: }
224:
225: int
226: sshkey_type_from_name(const char *name)
227: {
1.123 djm 228: int i;
229: const struct sshkey_impl *impl;
1.1 djm 230:
1.123 djm 231: for (i = 0; keyimpls[i] != NULL; i++) {
232: impl = keyimpls[i];
1.1 djm 233: /* Only allow shortname matches for plain key types */
1.123 djm 234: if ((impl->name != NULL && strcmp(name, impl->name) == 0) ||
235: (!impl->cert && strcasecmp(impl->shortname, name) == 0))
236: return impl->type;
1.1 djm 237: }
238: return KEY_UNSPEC;
239: }
240:
1.85 djm 241: static int
242: key_type_is_ecdsa_variant(int type)
243: {
244: switch (type) {
245: case KEY_ECDSA:
246: case KEY_ECDSA_CERT:
247: case KEY_ECDSA_SK:
248: case KEY_ECDSA_SK_CERT:
249: return 1;
250: }
251: return 0;
252: }
253:
1.1 djm 254: int
255: sshkey_ecdsa_nid_from_name(const char *name)
256: {
1.123 djm 257: int i;
1.1 djm 258:
1.123 djm 259: for (i = 0; keyimpls[i] != NULL; i++) {
260: if (!key_type_is_ecdsa_variant(keyimpls[i]->type))
1.4 djm 261: continue;
1.123 djm 262: if (keyimpls[i]->name != NULL &&
263: strcmp(name, keyimpls[i]->name) == 0)
264: return keyimpls[i]->nid;
1.4 djm 265: }
1.1 djm 266: return -1;
1.120 djm 267: }
268:
269: int
270: sshkey_match_keyname_to_sigalgs(const char *keyname, const char *sigalgs)
271: {
272: int ktype;
273:
274: if (sigalgs == NULL || *sigalgs == '\0' ||
275: (ktype = sshkey_type_from_name(keyname)) == KEY_UNSPEC)
276: return 0;
277: else if (ktype == KEY_RSA) {
278: return match_pattern_list("ssh-rsa", sigalgs, 0) == 1 ||
279: match_pattern_list("rsa-sha2-256", sigalgs, 0) == 1 ||
280: match_pattern_list("rsa-sha2-512", sigalgs, 0) == 1;
281: } else if (ktype == KEY_RSA_CERT) {
282: return match_pattern_list("ssh-rsa-cert-v01@openssh.com",
283: sigalgs, 0) == 1 ||
284: match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
285: sigalgs, 0) == 1 ||
286: match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
287: sigalgs, 0) == 1;
288: } else
289: return match_pattern_list(keyname, sigalgs, 0) == 1;
1.1 djm 290: }
291:
292: char *
1.45 djm 293: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 294: {
295: char *tmp, *ret = NULL;
1.123 djm 296: size_t i, nlen, rlen = 0;
297: const struct sshkey_impl *impl;
1.1 djm 298:
1.123 djm 299: for (i = 0; keyimpls[i] != NULL; i++) {
300: impl = keyimpls[i];
301: if (impl->name == NULL)
1.45 djm 302: continue;
1.123 djm 303: if (!include_sigonly && impl->sigonly)
1.1 djm 304: continue;
1.123 djm 305: if ((certs_only && !impl->cert) || (plain_only && impl->cert))
1.1 djm 306: continue;
307: if (ret != NULL)
1.38 djm 308: ret[rlen++] = sep;
1.123 djm 309: nlen = strlen(impl->name);
1.1 djm 310: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
311: free(ret);
312: return NULL;
313: }
314: ret = tmp;
1.123 djm 315: memcpy(ret + rlen, impl->name, nlen + 1);
1.1 djm 316: rlen += nlen;
317: }
318: return ret;
319: }
320:
321: int
1.11 djm 322: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 323: {
324: char *s, *cp, *p;
1.123 djm 325: const struct sshkey_impl *impl;
326: int i, type;
1.1 djm 327:
328: if (names == NULL || strcmp(names, "") == 0)
329: return 0;
330: if ((s = cp = strdup(names)) == NULL)
331: return 0;
332: for ((p = strsep(&cp, ",")); p && *p != '\0';
333: (p = strsep(&cp, ","))) {
1.11 djm 334: type = sshkey_type_from_name(p);
335: if (type == KEY_UNSPEC) {
336: if (allow_wildcard) {
337: /*
338: * Try matching key types against the string.
339: * If any has a positive or negative match then
340: * the component is accepted.
341: */
1.123 djm 342: impl = NULL;
343: for (i = 0; keyimpls[i] != NULL; i++) {
344: if (match_pattern_list(
345: keyimpls[i]->name, p, 0) != 0) {
346: impl = keyimpls[i];
1.11 djm 347: break;
1.123 djm 348: }
1.11 djm 349: }
1.123 djm 350: if (impl != NULL)
1.11 djm 351: continue;
352: }
1.1 djm 353: free(s);
354: return 0;
355: }
356: }
357: free(s);
358: return 1;
359: }
360:
361: u_int
362: sshkey_size(const struct sshkey *k)
363: {
1.123 djm 364: const struct sshkey_impl *impl;
1.69 djm 365:
1.126 djm 366: if ((impl = sshkey_impl_from_key(k)) == NULL)
1.123 djm 367: return 0;
368: if (impl->funcs->size != NULL)
369: return impl->funcs->size(k);
370: return impl->keybits;
1.1 djm 371: }
372:
373: static int
374: sshkey_type_is_valid_ca(int type)
375: {
1.123 djm 376: const struct sshkey_impl *impl;
377:
378: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 379: return 0;
1.123 djm 380: /* All non-certificate types may act as CAs */
381: return !impl->cert;
1.1 djm 382: }
383:
384: int
385: sshkey_is_cert(const struct sshkey *k)
386: {
387: if (k == NULL)
388: return 0;
389: return sshkey_type_is_cert(k->type);
390: }
391:
1.90 markus 392: int
393: sshkey_is_sk(const struct sshkey *k)
394: {
395: if (k == NULL)
396: return 0;
397: switch (sshkey_type_plain(k->type)) {
398: case KEY_ECDSA_SK:
399: case KEY_ED25519_SK:
400: return 1;
401: default:
402: return 0;
403: }
404: }
405:
1.1 djm 406: /* Return the cert-less equivalent to a certified key type */
407: int
408: sshkey_type_plain(int type)
409: {
410: switch (type) {
411: case KEY_RSA_CERT:
412: return KEY_RSA;
413: case KEY_DSA_CERT:
414: return KEY_DSA;
415: case KEY_ECDSA_CERT:
416: return KEY_ECDSA;
1.85 djm 417: case KEY_ECDSA_SK_CERT:
418: return KEY_ECDSA_SK;
1.1 djm 419: case KEY_ED25519_CERT:
420: return KEY_ED25519;
1.90 markus 421: case KEY_ED25519_SK_CERT:
422: return KEY_ED25519_SK;
1.62 markus 423: case KEY_XMSS_CERT:
424: return KEY_XMSS;
1.1 djm 425: default:
426: return type;
427: }
428: }
429:
1.131 djm 430: /* Return the cert equivalent to a plain key type */
431: static int
432: sshkey_type_certified(int type)
433: {
434: switch (type) {
435: case KEY_RSA:
436: return KEY_RSA_CERT;
437: case KEY_DSA:
438: return KEY_DSA_CERT;
439: case KEY_ECDSA:
440: return KEY_ECDSA_CERT;
441: case KEY_ECDSA_SK:
442: return KEY_ECDSA_SK_CERT;
443: case KEY_ED25519:
444: return KEY_ED25519_CERT;
445: case KEY_ED25519_SK:
446: return KEY_ED25519_SK_CERT;
447: case KEY_XMSS:
448: return KEY_XMSS_CERT;
449: default:
450: return -1;
451: }
452: }
453:
1.1 djm 454: #ifdef WITH_OPENSSL
455: /* XXX: these are really begging for a table-driven approach */
456: int
457: sshkey_curve_name_to_nid(const char *name)
458: {
459: if (strcmp(name, "nistp256") == 0)
460: return NID_X9_62_prime256v1;
461: else if (strcmp(name, "nistp384") == 0)
462: return NID_secp384r1;
463: else if (strcmp(name, "nistp521") == 0)
464: return NID_secp521r1;
465: else
466: return -1;
467: }
468:
469: u_int
470: sshkey_curve_nid_to_bits(int nid)
471: {
472: switch (nid) {
473: case NID_X9_62_prime256v1:
474: return 256;
475: case NID_secp384r1:
476: return 384;
477: case NID_secp521r1:
478: return 521;
479: default:
480: return 0;
481: }
482: }
483:
484: int
485: sshkey_ecdsa_bits_to_nid(int bits)
486: {
487: switch (bits) {
488: case 256:
489: return NID_X9_62_prime256v1;
490: case 384:
491: return NID_secp384r1;
492: case 521:
493: return NID_secp521r1;
494: default:
495: return -1;
496: }
497: }
498:
499: const char *
500: sshkey_curve_nid_to_name(int nid)
501: {
502: switch (nid) {
503: case NID_X9_62_prime256v1:
504: return "nistp256";
505: case NID_secp384r1:
506: return "nistp384";
507: case NID_secp521r1:
508: return "nistp521";
509: default:
510: return NULL;
511: }
512: }
513:
514: int
515: sshkey_ec_nid_to_hash_alg(int nid)
516: {
517: int kbits = sshkey_curve_nid_to_bits(nid);
518:
519: if (kbits <= 0)
520: return -1;
521:
522: /* RFC5656 section 6.2.1 */
523: if (kbits <= 256)
524: return SSH_DIGEST_SHA256;
525: else if (kbits <= 384)
526: return SSH_DIGEST_SHA384;
527: else
528: return SSH_DIGEST_SHA512;
529: }
530: #endif /* WITH_OPENSSL */
531:
532: static void
533: cert_free(struct sshkey_cert *cert)
534: {
535: u_int i;
536:
537: if (cert == NULL)
538: return;
1.31 mmcc 539: sshbuf_free(cert->certblob);
540: sshbuf_free(cert->critical);
541: sshbuf_free(cert->extensions);
1.29 mmcc 542: free(cert->key_id);
1.1 djm 543: for (i = 0; i < cert->nprincipals; i++)
544: free(cert->principals[i]);
1.29 mmcc 545: free(cert->principals);
1.30 mmcc 546: sshkey_free(cert->signature_key);
1.67 djm 547: free(cert->signature_type);
1.61 jsing 548: freezero(cert, sizeof(*cert));
1.1 djm 549: }
550:
551: static struct sshkey_cert *
552: cert_new(void)
553: {
554: struct sshkey_cert *cert;
555:
556: if ((cert = calloc(1, sizeof(*cert))) == NULL)
557: return NULL;
558: if ((cert->certblob = sshbuf_new()) == NULL ||
559: (cert->critical = sshbuf_new()) == NULL ||
560: (cert->extensions = sshbuf_new()) == NULL) {
561: cert_free(cert);
562: return NULL;
563: }
564: cert->key_id = NULL;
565: cert->principals = NULL;
566: cert->signature_key = NULL;
1.67 djm 567: cert->signature_type = NULL;
1.1 djm 568: return cert;
569: }
570:
571: struct sshkey *
572: sshkey_new(int type)
573: {
574: struct sshkey *k;
1.123 djm 575: const struct sshkey_impl *impl = NULL;
576:
577: if (type != KEY_UNSPEC &&
578: (impl = sshkey_impl_from_type(type)) == NULL)
579: return NULL;
1.1 djm 580:
1.123 djm 581: /* All non-certificate types may act as CAs */
1.1 djm 582: if ((k = calloc(1, sizeof(*k))) == NULL)
583: return NULL;
584: k->type = type;
585: k->ecdsa_nid = -1;
1.123 djm 586: if (impl != NULL && impl->funcs->alloc != NULL) {
587: if (impl->funcs->alloc(k) != 0) {
1.1 djm 588: free(k);
589: return NULL;
590: }
591: }
592: if (sshkey_is_cert(k)) {
593: if ((k->cert = cert_new()) == NULL) {
594: sshkey_free(k);
595: return NULL;
596: }
597: }
598:
599: return k;
600: }
601:
1.124 djm 602: /* Frees common FIDO fields */
603: void
604: sshkey_sk_cleanup(struct sshkey *k)
605: {
606: free(k->sk_application);
607: sshbuf_free(k->sk_key_handle);
608: sshbuf_free(k->sk_reserved);
609: k->sk_application = NULL;
610: k->sk_key_handle = k->sk_reserved = NULL;
611: }
612:
1.126 djm 613: static void
614: sshkey_free_contents(struct sshkey *k)
1.1 djm 615: {
1.123 djm 616: const struct sshkey_impl *impl;
617:
1.1 djm 618: if (k == NULL)
619: return;
1.123 djm 620: if ((impl = sshkey_impl_from_type(k->type)) != NULL &&
621: impl->funcs->cleanup != NULL)
622: impl->funcs->cleanup(k);
1.1 djm 623: if (sshkey_is_cert(k))
624: cert_free(k->cert);
1.76 djm 625: freezero(k->shielded_private, k->shielded_len);
626: freezero(k->shield_prekey, k->shield_prekey_len);
1.126 djm 627: }
628:
629: void
630: sshkey_free(struct sshkey *k)
631: {
632: sshkey_free_contents(k);
1.61 jsing 633: freezero(k, sizeof(*k));
1.1 djm 634: }
635:
636: static int
637: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
638: {
639: if (a == NULL && b == NULL)
640: return 1;
641: if (a == NULL || b == NULL)
642: return 0;
643: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
644: return 0;
645: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
646: sshbuf_len(a->certblob)) != 0)
647: return 0;
648: return 1;
649: }
650:
1.124 djm 651: /* Compares FIDO-specific pubkey fields only */
652: int
653: sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b)
654: {
655: if (a->sk_application == NULL || b->sk_application == NULL)
656: return 0;
657: if (strcmp(a->sk_application, b->sk_application) != 0)
658: return 0;
659: return 1;
660: }
661:
1.1 djm 662: /*
663: * Compare public portions of key only, allowing comparisons between
664: * certificates and plain keys too.
665: */
666: int
667: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
668: {
1.124 djm 669: const struct sshkey_impl *impl;
1.1 djm 670:
671: if (a == NULL || b == NULL ||
672: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
673: return 0;
1.124 djm 674: if ((impl = sshkey_impl_from_type(a->type)) == NULL)
1.1 djm 675: return 0;
1.124 djm 676: return impl->funcs->equal(a, b);
1.1 djm 677: }
678:
679: int
680: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
681: {
682: if (a == NULL || b == NULL || a->type != b->type)
683: return 0;
684: if (sshkey_is_cert(a)) {
685: if (!cert_compare(a->cert, b->cert))
686: return 0;
687: }
688: return sshkey_equal_public(a, b);
689: }
690:
1.125 djm 691:
692: /* Serialise common FIDO key parts */
693: int
694: sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b)
695: {
696: int r;
697:
698: if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0)
699: return r;
700:
701: return 0;
702: }
703:
1.1 djm 704: static int
1.62 markus 705: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
706: enum sshkey_serialize_rep opts)
1.1 djm 707: {
708: int type, ret = SSH_ERR_INTERNAL_ERROR;
709: const char *typename;
1.125 djm 710: const struct sshkey_impl *impl;
1.1 djm 711:
712: if (key == NULL)
713: return SSH_ERR_INVALID_ARGUMENT;
714:
1.125 djm 715: type = force_plain ? sshkey_type_plain(key->type) : key->type;
716:
717: if (sshkey_type_is_cert(type)) {
1.19 djm 718: if (key->cert == NULL)
719: return SSH_ERR_EXPECTED_CERT;
720: if (sshbuf_len(key->cert->certblob) == 0)
721: return SSH_ERR_KEY_LACKS_CERTBLOB;
1.1 djm 722: /* Use the existing blob */
723: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
724: return ret;
1.125 djm 725: return 0;
726: }
727: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 728: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.125 djm 729:
730: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
1.129 djm 731: if ((ret = sshbuf_put_cstring(b, typename)) != 0)
732: return ret;
733: return impl->funcs->serialize_public(key, b, opts);
1.1 djm 734: }
735:
736: int
1.14 djm 737: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 738: {
1.62 markus 739: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 740: }
741:
742: int
1.62 markus 743: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
744: enum sshkey_serialize_rep opts)
1.14 djm 745: {
746: struct sshbuf *tmp;
747: int r;
748:
749: if ((tmp = sshbuf_new()) == NULL)
750: return SSH_ERR_ALLOC_FAIL;
1.62 markus 751: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 752: if (r == 0)
753: r = sshbuf_put_stringb(b, tmp);
754: sshbuf_free(tmp);
755: return r;
756: }
757:
758: int
1.62 markus 759: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
760: {
761: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
762: }
763:
764: int
1.14 djm 765: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 766: {
1.62 markus 767: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 768: }
769:
770: static int
1.62 markus 771: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
772: enum sshkey_serialize_rep opts)
1.1 djm 773: {
774: int ret = SSH_ERR_INTERNAL_ERROR;
775: size_t len;
776: struct sshbuf *b = NULL;
777:
778: if (lenp != NULL)
779: *lenp = 0;
780: if (blobp != NULL)
781: *blobp = NULL;
782: if ((b = sshbuf_new()) == NULL)
783: return SSH_ERR_ALLOC_FAIL;
1.62 markus 784: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 785: goto out;
786: len = sshbuf_len(b);
787: if (lenp != NULL)
788: *lenp = len;
789: if (blobp != NULL) {
790: if ((*blobp = malloc(len)) == NULL) {
791: ret = SSH_ERR_ALLOC_FAIL;
792: goto out;
793: }
794: memcpy(*blobp, sshbuf_ptr(b), len);
795: }
796: ret = 0;
797: out:
798: sshbuf_free(b);
799: return ret;
800: }
801:
802: int
803: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
804: {
1.62 markus 805: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 806: }
807:
808: int
809: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
810: {
1.62 markus 811: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 812: }
813:
814: int
1.7 djm 815: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 816: u_char **retp, size_t *lenp)
817: {
818: u_char *blob = NULL, *ret = NULL;
819: size_t blob_len = 0;
1.7 djm 820: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 821:
822: if (retp != NULL)
823: *retp = NULL;
824: if (lenp != NULL)
825: *lenp = 0;
1.7 djm 826: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 827: r = SSH_ERR_INVALID_ARGUMENT;
828: goto out;
829: }
1.62 markus 830: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
831: != 0)
1.1 djm 832: goto out;
833: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
834: r = SSH_ERR_ALLOC_FAIL;
835: goto out;
836: }
1.7 djm 837: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 838: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
839: goto out;
840: /* success */
841: if (retp != NULL) {
842: *retp = ret;
843: ret = NULL;
844: }
845: if (lenp != NULL)
1.7 djm 846: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 847: r = 0;
848: out:
849: free(ret);
1.100 jsg 850: if (blob != NULL)
851: freezero(blob, blob_len);
1.1 djm 852: return r;
853: }
854:
855: static char *
1.7 djm 856: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
857: {
858: char *ret;
859: size_t plen = strlen(alg) + 1;
860: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
861:
862: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
863: return NULL;
864: strlcpy(ret, alg, rlen);
865: strlcat(ret, ":", rlen);
866: if (dgst_raw_len == 0)
867: return ret;
1.79 dtucker 868: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 869: freezero(ret, rlen);
1.7 djm 870: return NULL;
871: }
872: /* Trim padding characters from end */
873: ret[strcspn(ret, "=")] = '\0';
874: return ret;
875: }
876:
877: static char *
878: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 879: {
1.7 djm 880: char *retval, hex[5];
881: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 882:
1.7 djm 883: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 884: return NULL;
1.7 djm 885: strlcpy(retval, alg, rlen);
886: strlcat(retval, ":", rlen);
1.1 djm 887: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 888: snprintf(hex, sizeof(hex), "%s%02x",
889: i > 0 ? ":" : "", dgst_raw[i]);
890: strlcat(retval, hex, rlen);
1.1 djm 891: }
892: return retval;
893: }
894:
895: static char *
896: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
897: {
898: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
899: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
900: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
901: u_int i, j = 0, rounds, seed = 1;
902: char *retval;
903:
904: rounds = (dgst_raw_len / 2) + 1;
905: if ((retval = calloc(rounds, 6)) == NULL)
906: return NULL;
907: retval[j++] = 'x';
908: for (i = 0; i < rounds; i++) {
909: u_int idx0, idx1, idx2, idx3, idx4;
910: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
911: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
912: seed) % 6;
913: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
914: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
915: (seed / 6)) % 6;
916: retval[j++] = vowels[idx0];
917: retval[j++] = consonants[idx1];
918: retval[j++] = vowels[idx2];
919: if ((i + 1) < rounds) {
920: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
921: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
922: retval[j++] = consonants[idx3];
923: retval[j++] = '-';
924: retval[j++] = consonants[idx4];
925: seed = ((seed * 5) +
926: ((((u_int)(dgst_raw[2 * i])) * 7) +
927: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
928: }
929: } else {
930: idx0 = seed % 6;
931: idx1 = 16;
932: idx2 = seed / 6;
933: retval[j++] = vowels[idx0];
934: retval[j++] = consonants[idx1];
935: retval[j++] = vowels[idx2];
936: }
937: }
938: retval[j++] = 'x';
939: retval[j++] = '\0';
940: return retval;
941: }
942:
943: /*
944: * Draw an ASCII-Art representing the fingerprint so human brain can
945: * profit from its built-in pattern recognition ability.
946: * This technique is called "random art" and can be found in some
947: * scientific publications like this original paper:
948: *
949: * "Hash Visualization: a New Technique to improve Real-World Security",
950: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
951: * Techniques and E-Commerce (CrypTEC '99)
952: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
953: *
954: * The subject came up in a talk by Dan Kaminsky, too.
955: *
956: * If you see the picture is different, the key is different.
957: * If the picture looks the same, you still know nothing.
958: *
959: * The algorithm used here is a worm crawling over a discrete plane,
960: * leaving a trace (augmenting the field) everywhere it goes.
961: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
962: * makes the respective movement vector be ignored for this turn.
963: * Graphs are not unambiguous, because circles in graphs can be
964: * walked in either direction.
965: */
966:
967: /*
968: * Field sizes for the random art. Have to be odd, so the starting point
969: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
970: * Else pictures would be too dense, and drawing the frame would
971: * fail, too, because the key type would not fit in anymore.
972: */
973: #define FLDBASE 8
974: #define FLDSIZE_Y (FLDBASE + 1)
975: #define FLDSIZE_X (FLDBASE * 2 + 1)
976: static char *
1.7 djm 977: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 978: const struct sshkey *k)
979: {
980: /*
981: * Chars to be used after each other every time the worm
982: * intersects with itself. Matter of taste.
983: */
984: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 985: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 986: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 987: size_t i, tlen, hlen;
1.1 djm 988: u_int b;
1.3 djm 989: int x, y, r;
1.1 djm 990: size_t len = strlen(augmentation_string) - 1;
991:
992: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
993: return NULL;
994:
995: /* initialize field */
996: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
997: x = FLDSIZE_X / 2;
998: y = FLDSIZE_Y / 2;
999:
1000: /* process raw key */
1001: for (i = 0; i < dgst_raw_len; i++) {
1002: int input;
1003: /* each byte conveys four 2-bit move commands */
1004: input = dgst_raw[i];
1005: for (b = 0; b < 4; b++) {
1006: /* evaluate 2 bit, rest is shifted later */
1007: x += (input & 0x1) ? 1 : -1;
1008: y += (input & 0x2) ? 1 : -1;
1009:
1010: /* assure we are still in bounds */
1.37 deraadt 1011: x = MAXIMUM(x, 0);
1012: y = MAXIMUM(y, 0);
1013: x = MINIMUM(x, FLDSIZE_X - 1);
1014: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1015:
1016: /* augment the field */
1017: if (field[x][y] < len - 2)
1018: field[x][y]++;
1019: input = input >> 2;
1020: }
1021: }
1022:
1023: /* mark starting point and end point*/
1024: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1025: field[x][y] = len;
1026:
1.3 djm 1027: /* assemble title */
1028: r = snprintf(title, sizeof(title), "[%s %u]",
1029: sshkey_type(k), sshkey_size(k));
1030: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1031: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1032: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1033: tlen = (r <= 0) ? 0 : strlen(title);
1034:
1035: /* assemble hash ID. */
1036: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1037: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1038:
1039: /* output upper border */
1.3 djm 1040: p = retval;
1041: *p++ = '+';
1042: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1043: *p++ = '-';
1044: memcpy(p, title, tlen);
1045: p += tlen;
1.7 djm 1046: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1047: *p++ = '-';
1048: *p++ = '+';
1049: *p++ = '\n';
1050:
1051: /* output content */
1052: for (y = 0; y < FLDSIZE_Y; y++) {
1053: *p++ = '|';
1054: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1055: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1056: *p++ = '|';
1057: *p++ = '\n';
1058: }
1059:
1060: /* output lower border */
1061: *p++ = '+';
1.7 djm 1062: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1063: *p++ = '-';
1064: memcpy(p, hash, hlen);
1065: p += hlen;
1066: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1067: *p++ = '-';
1068: *p++ = '+';
1069:
1070: return retval;
1071: }
1072:
1073: char *
1.7 djm 1074: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1075: enum sshkey_fp_rep dgst_rep)
1076: {
1077: char *retval = NULL;
1078: u_char *dgst_raw;
1079: size_t dgst_raw_len;
1080:
1.7 djm 1081: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1082: return NULL;
1083: switch (dgst_rep) {
1.7 djm 1084: case SSH_FP_DEFAULT:
1085: if (dgst_alg == SSH_DIGEST_MD5) {
1086: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1087: dgst_raw, dgst_raw_len);
1088: } else {
1089: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1090: dgst_raw, dgst_raw_len);
1091: }
1092: break;
1.1 djm 1093: case SSH_FP_HEX:
1.7 djm 1094: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1095: dgst_raw, dgst_raw_len);
1096: break;
1097: case SSH_FP_BASE64:
1098: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1099: dgst_raw, dgst_raw_len);
1.1 djm 1100: break;
1101: case SSH_FP_BUBBLEBABBLE:
1102: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1103: break;
1104: case SSH_FP_RANDOMART:
1.7 djm 1105: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1106: dgst_raw, dgst_raw_len, k);
1.1 djm 1107: break;
1108: default:
1.100 jsg 1109: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1110: return NULL;
1111: }
1.100 jsg 1112: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1113: return retval;
1114: }
1115:
1.63 djm 1116: static int
1117: peek_type_nid(const char *s, size_t l, int *nid)
1118: {
1.123 djm 1119: const struct sshkey_impl *impl;
1120: int i;
1.63 djm 1121:
1.123 djm 1122: for (i = 0; keyimpls[i] != NULL; i++) {
1123: impl = keyimpls[i];
1124: if (impl->name == NULL || strlen(impl->name) != l)
1.63 djm 1125: continue;
1.123 djm 1126: if (memcmp(s, impl->name, l) == 0) {
1.63 djm 1127: *nid = -1;
1.123 djm 1128: if (key_type_is_ecdsa_variant(impl->type))
1129: *nid = impl->nid;
1130: return impl->type;
1.63 djm 1131: }
1132: }
1133: return KEY_UNSPEC;
1134: }
1.1 djm 1135:
1.63 djm 1136: /* XXX this can now be made const char * */
1.1 djm 1137: int
1138: sshkey_read(struct sshkey *ret, char **cpp)
1139: {
1140: struct sshkey *k;
1.63 djm 1141: char *cp, *blobcopy;
1142: size_t space;
1.1 djm 1143: int r, type, curve_nid = -1;
1144: struct sshbuf *blob;
1.44 dtucker 1145:
1146: if (ret == NULL)
1147: return SSH_ERR_INVALID_ARGUMENT;
1.126 djm 1148: if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL)
1.63 djm 1149: return SSH_ERR_INVALID_ARGUMENT;
1150:
1151: /* Decode type */
1152: cp = *cpp;
1153: space = strcspn(cp, " \t");
1154: if (space == strlen(cp))
1155: return SSH_ERR_INVALID_FORMAT;
1156: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1157: return SSH_ERR_INVALID_FORMAT;
1158:
1159: /* skip whitespace */
1160: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1161: ;
1162: if (*cp == '\0')
1163: return SSH_ERR_INVALID_FORMAT;
1164: if (ret->type != KEY_UNSPEC && ret->type != type)
1165: return SSH_ERR_KEY_TYPE_MISMATCH;
1166: if ((blob = sshbuf_new()) == NULL)
1167: return SSH_ERR_ALLOC_FAIL;
1168:
1169: /* find end of keyblob and decode */
1170: space = strcspn(cp, " \t");
1171: if ((blobcopy = strndup(cp, space)) == NULL) {
1172: sshbuf_free(blob);
1173: return SSH_ERR_ALLOC_FAIL;
1174: }
1175: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1176: free(blobcopy);
1177: sshbuf_free(blob);
1178: return r;
1179: }
1180: free(blobcopy);
1181: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1182: sshbuf_free(blob);
1.63 djm 1183: return r;
1184: }
1185: sshbuf_free(blob);
1186:
1187: /* skip whitespace and leave cp at start of comment */
1188: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1189: ;
1190:
1191: /* ensure type of blob matches type at start of line */
1192: if (k->type != type) {
1193: sshkey_free(k);
1194: return SSH_ERR_KEY_TYPE_MISMATCH;
1195: }
1.85 djm 1196: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1197: sshkey_free(k);
1198: return SSH_ERR_EC_CURVE_MISMATCH;
1199: }
1200:
1201: /* Fill in ret from parsed key */
1.126 djm 1202: sshkey_free_contents(ret);
1203: *ret = *k;
1204: freezero(k, sizeof(*k));
1.63 djm 1205:
1206: /* success */
1207: *cpp = cp;
1208: return 0;
1.1 djm 1209: }
1210:
1211: int
1.19 djm 1212: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1213: {
1.19 djm 1214: int r = SSH_ERR_INTERNAL_ERROR;
1215: struct sshbuf *b = NULL;
1.1 djm 1216: char *uu = NULL;
1.19 djm 1217:
1218: if (b64p != NULL)
1219: *b64p = NULL;
1220: if ((b = sshbuf_new()) == NULL)
1221: return SSH_ERR_ALLOC_FAIL;
1222: if ((r = sshkey_putb(key, b)) != 0)
1223: goto out;
1.81 djm 1224: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1225: r = SSH_ERR_ALLOC_FAIL;
1226: goto out;
1227: }
1228: /* Success */
1229: if (b64p != NULL) {
1230: *b64p = uu;
1231: uu = NULL;
1232: }
1233: r = 0;
1234: out:
1235: sshbuf_free(b);
1236: free(uu);
1237: return r;
1238: }
1239:
1.52 djm 1240: int
1.19 djm 1241: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1242: {
1243: int r = SSH_ERR_INTERNAL_ERROR;
1244: char *uu = NULL;
1245:
1.48 djm 1246: if ((r = sshkey_to_base64(key, &uu)) != 0)
1247: goto out;
1248: if ((r = sshbuf_putf(b, "%s %s",
1249: sshkey_ssh_name(key), uu)) != 0)
1250: goto out;
1.19 djm 1251: r = 0;
1252: out:
1253: free(uu);
1254: return r;
1255: }
1256:
1257: int
1258: sshkey_write(const struct sshkey *key, FILE *f)
1259: {
1260: struct sshbuf *b = NULL;
1261: int r = SSH_ERR_INTERNAL_ERROR;
1262:
1263: if ((b = sshbuf_new()) == NULL)
1264: return SSH_ERR_ALLOC_FAIL;
1265: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1266: goto out;
1267: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1268: if (feof(f))
1269: errno = EPIPE;
1.19 djm 1270: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1271: goto out;
1272: }
1.19 djm 1273: /* Success */
1274: r = 0;
1.1 djm 1275: out:
1.19 djm 1276: sshbuf_free(b);
1277: return r;
1.1 djm 1278: }
1279:
1280: const char *
1281: sshkey_cert_type(const struct sshkey *k)
1282: {
1283: switch (k->cert->type) {
1284: case SSH2_CERT_TYPE_USER:
1285: return "user";
1286: case SSH2_CERT_TYPE_HOST:
1287: return "host";
1288: default:
1289: return "unknown";
1290: }
1291: }
1292:
1.134 ! djm 1293: int
! 1294: sshkey_check_rsa_length(const struct sshkey *k, int min_size)
! 1295: {
! 1296: #ifdef WITH_OPENSSL
! 1297: const BIGNUM *rsa_n;
! 1298: int nbits;
! 1299:
! 1300: if (k == NULL || k->rsa == NULL ||
! 1301: (k->type != KEY_RSA && k->type != KEY_RSA_CERT))
! 1302: return 0;
! 1303: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
! 1304: nbits = BN_num_bits(rsa_n);
! 1305: if (nbits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
! 1306: (min_size > 0 && nbits < min_size))
! 1307: return SSH_ERR_KEY_LENGTH;
! 1308: #endif /* WITH_OPENSSL */
! 1309: return 0;
! 1310: }
! 1311:
1.1 djm 1312: #ifdef WITH_OPENSSL
1313: int
1314: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1315: {
1316: EC_GROUP *eg;
1317: int nids[] = {
1318: NID_X9_62_prime256v1,
1319: NID_secp384r1,
1320: NID_secp521r1,
1321: -1
1322: };
1323: int nid;
1324: u_int i;
1325: const EC_GROUP *g = EC_KEY_get0_group(k);
1326:
1327: /*
1328: * The group may be stored in a ASN.1 encoded private key in one of two
1329: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1330: * or explicit group parameters encoded into the key blob. Only the
1331: * "named group" case sets the group NID for us, but we can figure
1332: * it out for the other case by comparing against all the groups that
1333: * are supported.
1334: */
1335: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1336: return nid;
1337: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1338: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1339: return -1;
1.93 djm 1340: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1341: break;
1342: EC_GROUP_free(eg);
1343: }
1344: if (nids[i] != -1) {
1345: /* Use the group with the NID attached */
1346: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1347: if (EC_KEY_set_group(k, eg) != 1) {
1348: EC_GROUP_free(eg);
1349: return -1;
1350: }
1351: }
1352: return nids[i];
1353: }
1354: #endif /* WITH_OPENSSL */
1355:
1356: int
1357: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1358: {
1359: struct sshkey *k;
1360: int ret = SSH_ERR_INTERNAL_ERROR;
1.127 djm 1361: const struct sshkey_impl *impl;
1.1 djm 1362:
1.127 djm 1363: if (keyp == NULL || sshkey_type_is_cert(type))
1.1 djm 1364: return SSH_ERR_INVALID_ARGUMENT;
1365: *keyp = NULL;
1.127 djm 1366: if ((impl = sshkey_impl_from_type(type)) == NULL)
1367: return SSH_ERR_KEY_TYPE_UNKNOWN;
1368: if (impl->funcs->generate == NULL)
1369: return SSH_ERR_FEATURE_UNSUPPORTED;
1.1 djm 1370: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1371: return SSH_ERR_ALLOC_FAIL;
1.127 djm 1372: k->type = type;
1373: if ((ret = impl->funcs->generate(k, bits)) != 0) {
1374: sshkey_free(k);
1375: return ret;
1.1 djm 1376: }
1.127 djm 1377: /* success */
1378: *keyp = k;
1379: return 0;
1.1 djm 1380: }
1381:
1382: int
1383: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1384: {
1385: u_int i;
1386: const struct sshkey_cert *from;
1387: struct sshkey_cert *to;
1.67 djm 1388: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1389:
1.67 djm 1390: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1391: return SSH_ERR_INVALID_ARGUMENT;
1392:
1.67 djm 1393: if ((to = cert_new()) == NULL)
1.1 djm 1394: return SSH_ERR_ALLOC_FAIL;
1395:
1.67 djm 1396: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1397: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1398: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1399: goto out;
1.1 djm 1400:
1401: to->serial = from->serial;
1402: to->type = from->type;
1403: if (from->key_id == NULL)
1404: to->key_id = NULL;
1.67 djm 1405: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1406: r = SSH_ERR_ALLOC_FAIL;
1407: goto out;
1408: }
1.1 djm 1409: to->valid_after = from->valid_after;
1410: to->valid_before = from->valid_before;
1411: if (from->signature_key == NULL)
1412: to->signature_key = NULL;
1.67 djm 1413: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1414: &to->signature_key)) != 0)
1.67 djm 1415: goto out;
1416: if (from->signature_type != NULL &&
1417: (to->signature_type = strdup(from->signature_type)) == NULL) {
1418: r = SSH_ERR_ALLOC_FAIL;
1419: goto out;
1420: }
1421: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1422: r = SSH_ERR_INVALID_ARGUMENT;
1423: goto out;
1424: }
1.1 djm 1425: if (from->nprincipals > 0) {
1426: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1427: sizeof(*to->principals))) == NULL) {
1428: r = SSH_ERR_ALLOC_FAIL;
1429: goto out;
1430: }
1.1 djm 1431: for (i = 0; i < from->nprincipals; i++) {
1432: to->principals[i] = strdup(from->principals[i]);
1433: if (to->principals[i] == NULL) {
1434: to->nprincipals = i;
1.67 djm 1435: r = SSH_ERR_ALLOC_FAIL;
1436: goto out;
1.1 djm 1437: }
1438: }
1439: }
1440: to->nprincipals = from->nprincipals;
1.67 djm 1441:
1442: /* success */
1443: cert_free(to_key->cert);
1444: to_key->cert = to;
1445: to = NULL;
1446: r = 0;
1447: out:
1448: cert_free(to);
1449: return r;
1.1 djm 1450: }
1451:
1452: int
1.128 djm 1453: sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to)
1454: {
1455: /* Append security-key application string */
1456: if ((to->sk_application = strdup(from->sk_application)) == NULL)
1457: return SSH_ERR_ALLOC_FAIL;
1458: return 0;
1459: }
1460:
1461: int
1.1 djm 1462: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1463: {
1464: struct sshkey *n = NULL;
1.69 djm 1465: int r = SSH_ERR_INTERNAL_ERROR;
1.128 djm 1466: const struct sshkey_impl *impl;
1.1 djm 1467:
1.24 djm 1468: *pkp = NULL;
1.128 djm 1469: if ((impl = sshkey_impl_from_key(k)) == NULL)
1470: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.85 djm 1471: if ((n = sshkey_new(k->type)) == NULL) {
1472: r = SSH_ERR_ALLOC_FAIL;
1473: goto out;
1474: }
1.128 djm 1475: if ((r = impl->funcs->copy_public(k, n)) != 0)
1.69 djm 1476: goto out;
1477: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1478: goto out;
1479: /* success */
1.1 djm 1480: *pkp = n;
1.69 djm 1481: n = NULL;
1482: r = 0;
1483: out:
1484: sshkey_free(n);
1485: return r;
1.1 djm 1486: }
1487:
1.76 djm 1488: int
1489: sshkey_is_shielded(struct sshkey *k)
1490: {
1491: return k != NULL && k->shielded_private != NULL;
1492: }
1493:
1494: int
1495: sshkey_shield_private(struct sshkey *k)
1496: {
1497: struct sshbuf *prvbuf = NULL;
1498: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1499: struct sshcipher_ctx *cctx = NULL;
1500: const struct sshcipher *cipher;
1501: size_t i, enclen = 0;
1502: struct sshkey *kswap = NULL, tmp;
1503: int r = SSH_ERR_INTERNAL_ERROR;
1504:
1505: #ifdef DEBUG_PK
1506: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1507: #endif
1508: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1509: r = SSH_ERR_INVALID_ARGUMENT;
1510: goto out;
1511: }
1512: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1513: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1514: r = SSH_ERR_INTERNAL_ERROR;
1515: goto out;
1516: }
1517:
1518: /* Prepare a random pre-key, and from it an ephemeral key */
1519: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1520: r = SSH_ERR_ALLOC_FAIL;
1521: goto out;
1522: }
1523: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1524: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1525: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1526: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1527: goto out;
1528: #ifdef DEBUG_PK
1529: fprintf(stderr, "%s: key+iv\n", __func__);
1530: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1531: stderr);
1532: #endif
1533: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1534: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1535: goto out;
1536:
1537: /* Serialise and encrypt the private key using the ephemeral key */
1538: if ((prvbuf = sshbuf_new()) == NULL) {
1539: r = SSH_ERR_ALLOC_FAIL;
1540: goto out;
1541: }
1542: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1543: goto out;
1544: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.116 djm 1545: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 1546: goto out;
1547: /* pad to cipher blocksize */
1548: i = 0;
1549: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1550: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1551: goto out;
1552: }
1553: #ifdef DEBUG_PK
1554: fprintf(stderr, "%s: serialised\n", __func__);
1555: sshbuf_dump(prvbuf, stderr);
1556: #endif
1557: /* encrypt */
1558: enclen = sshbuf_len(prvbuf);
1559: if ((enc = malloc(enclen)) == NULL) {
1560: r = SSH_ERR_ALLOC_FAIL;
1561: goto out;
1562: }
1563: if ((r = cipher_crypt(cctx, 0, enc,
1564: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1565: goto out;
1566: #ifdef DEBUG_PK
1567: fprintf(stderr, "%s: encrypted\n", __func__);
1568: sshbuf_dump_data(enc, enclen, stderr);
1569: #endif
1570:
1571: /* Make a scrubbed, public-only copy of our private key argument */
1572: if ((r = sshkey_from_private(k, &kswap)) != 0)
1573: goto out;
1574:
1575: /* Swap the private key out (it will be destroyed below) */
1576: tmp = *kswap;
1577: *kswap = *k;
1578: *k = tmp;
1579:
1580: /* Insert the shielded key into our argument */
1581: k->shielded_private = enc;
1582: k->shielded_len = enclen;
1583: k->shield_prekey = prekey;
1584: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1585: enc = prekey = NULL; /* transferred */
1586: enclen = 0;
1.99 djm 1587:
1588: /* preserve key fields that are required for correct operation */
1589: k->sk_flags = kswap->sk_flags;
1.76 djm 1590:
1591: /* success */
1592: r = 0;
1593:
1594: out:
1595: /* XXX behaviour on error - invalidate original private key? */
1596: cipher_free(cctx);
1597: explicit_bzero(keyiv, sizeof(keyiv));
1598: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1599: freezero(enc, enclen);
1.76 djm 1600: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1601: sshkey_free(kswap);
1602: sshbuf_free(prvbuf);
1603: return r;
1604: }
1605:
1.121 djm 1606: /* Check deterministic padding after private key */
1607: static int
1608: private2_check_padding(struct sshbuf *decrypted)
1609: {
1610: u_char pad;
1611: size_t i;
1612: int r;
1613:
1614: i = 0;
1615: while (sshbuf_len(decrypted)) {
1616: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1617: goto out;
1618: if (pad != (++i & 0xff)) {
1619: r = SSH_ERR_INVALID_FORMAT;
1620: goto out;
1621: }
1622: }
1623: /* success */
1624: r = 0;
1625: out:
1626: explicit_bzero(&pad, sizeof(pad));
1627: explicit_bzero(&i, sizeof(i));
1628: return r;
1629: }
1630:
1.76 djm 1631: int
1632: sshkey_unshield_private(struct sshkey *k)
1633: {
1634: struct sshbuf *prvbuf = NULL;
1.121 djm 1635: u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1.76 djm 1636: struct sshcipher_ctx *cctx = NULL;
1637: const struct sshcipher *cipher;
1638: struct sshkey *kswap = NULL, tmp;
1639: int r = SSH_ERR_INTERNAL_ERROR;
1640:
1641: #ifdef DEBUG_PK
1642: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1643: #endif
1644: if (!sshkey_is_shielded(k))
1645: return 0; /* nothing to do */
1646:
1647: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1648: r = SSH_ERR_INVALID_ARGUMENT;
1649: goto out;
1650: }
1651: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1652: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1653: r = SSH_ERR_INTERNAL_ERROR;
1654: goto out;
1655: }
1656: /* check size of shielded key blob */
1657: if (k->shielded_len < cipher_blocksize(cipher) ||
1658: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1659: r = SSH_ERR_INVALID_FORMAT;
1660: goto out;
1661: }
1662:
1663: /* Calculate the ephemeral key from the prekey */
1664: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1665: k->shield_prekey, k->shield_prekey_len,
1666: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1667: goto out;
1668: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1669: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1670: goto out;
1671: #ifdef DEBUG_PK
1672: fprintf(stderr, "%s: key+iv\n", __func__);
1673: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1674: stderr);
1675: #endif
1676:
1677: /* Decrypt and parse the shielded private key using the ephemeral key */
1678: if ((prvbuf = sshbuf_new()) == NULL) {
1679: r = SSH_ERR_ALLOC_FAIL;
1680: goto out;
1681: }
1682: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
1683: goto out;
1684: /* decrypt */
1685: #ifdef DEBUG_PK
1686: fprintf(stderr, "%s: encrypted\n", __func__);
1687: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
1688: #endif
1689: if ((r = cipher_crypt(cctx, 0, cp,
1690: k->shielded_private, k->shielded_len, 0, 0)) != 0)
1691: goto out;
1692: #ifdef DEBUG_PK
1693: fprintf(stderr, "%s: serialised\n", __func__);
1694: sshbuf_dump(prvbuf, stderr);
1695: #endif
1696: /* Parse private key */
1697: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
1698: goto out;
1.121 djm 1699:
1700: if ((r = private2_check_padding(prvbuf)) != 0)
1701: goto out;
1.76 djm 1702:
1703: /* Swap the parsed key back into place */
1704: tmp = *kswap;
1705: *kswap = *k;
1706: *k = tmp;
1707:
1708: /* success */
1709: r = 0;
1710:
1711: out:
1712: cipher_free(cctx);
1713: explicit_bzero(keyiv, sizeof(keyiv));
1714: explicit_bzero(&tmp, sizeof(tmp));
1715: sshkey_free(kswap);
1716: sshbuf_free(prvbuf);
1717: return r;
1718: }
1719:
1.1 djm 1720: static int
1.14 djm 1721: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1722: {
1.14 djm 1723: struct sshbuf *principals = NULL, *crit = NULL;
1724: struct sshbuf *exts = NULL, *ca = NULL;
1725: u_char *sig = NULL;
1726: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1727: int ret = SSH_ERR_INTERNAL_ERROR;
1728:
1729: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1730: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1731: return ret;
1732:
1.20 djm 1733: /* Parse body of certificate up to signature */
1734: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1735: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1736: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1737: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1738: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1739: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1740: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1741: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1742: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1743: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1744: /* XXX debug print error for ret */
1745: ret = SSH_ERR_INVALID_FORMAT;
1746: goto out;
1747: }
1748:
1749: /* Signature is left in the buffer so we can calculate this length */
1750: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1751:
1752: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1753: ret = SSH_ERR_INVALID_FORMAT;
1754: goto out;
1755: }
1756:
1757: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1758: key->cert->type != SSH2_CERT_TYPE_HOST) {
1759: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1760: goto out;
1761: }
1762:
1.4 djm 1763: /* Parse principals section */
1764: while (sshbuf_len(principals) > 0) {
1765: char *principal = NULL;
1766: char **oprincipals = NULL;
1767:
1.1 djm 1768: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1769: ret = SSH_ERR_INVALID_FORMAT;
1770: goto out;
1771: }
1.4 djm 1772: if ((ret = sshbuf_get_cstring(principals, &principal,
1773: NULL)) != 0) {
1.1 djm 1774: ret = SSH_ERR_INVALID_FORMAT;
1775: goto out;
1776: }
1777: oprincipals = key->cert->principals;
1.51 deraadt 1778: key->cert->principals = recallocarray(key->cert->principals,
1779: key->cert->nprincipals, key->cert->nprincipals + 1,
1780: sizeof(*key->cert->principals));
1.1 djm 1781: if (key->cert->principals == NULL) {
1782: free(principal);
1783: key->cert->principals = oprincipals;
1784: ret = SSH_ERR_ALLOC_FAIL;
1785: goto out;
1786: }
1787: key->cert->principals[key->cert->nprincipals++] = principal;
1788: }
1789:
1.4 djm 1790: /*
1791: * Stash a copies of the critical options and extensions sections
1792: * for later use.
1793: */
1794: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1795: (exts != NULL &&
1796: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1797: goto out;
1798:
1.4 djm 1799: /*
1800: * Validate critical options and extensions sections format.
1801: */
1802: while (sshbuf_len(crit) != 0) {
1803: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1804: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1805: sshbuf_reset(key->cert->critical);
1.1 djm 1806: ret = SSH_ERR_INVALID_FORMAT;
1807: goto out;
1808: }
1809: }
1.4 djm 1810: while (exts != NULL && sshbuf_len(exts) != 0) {
1811: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1812: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1813: sshbuf_reset(key->cert->extensions);
1.1 djm 1814: ret = SSH_ERR_INVALID_FORMAT;
1815: goto out;
1816: }
1817: }
1818:
1.4 djm 1819: /* Parse CA key and check signature */
1.14 djm 1820: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1821: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1822: goto out;
1823: }
1824: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1825: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1826: goto out;
1827: }
1828: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 1829: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 1830: goto out;
1.82 djm 1831: if ((ret = sshkey_get_sigtype(sig, slen,
1832: &key->cert->signature_type)) != 0)
1.67 djm 1833: goto out;
1.4 djm 1834:
1835: /* Success */
1.1 djm 1836: ret = 0;
1837: out:
1.14 djm 1838: sshbuf_free(ca);
1.4 djm 1839: sshbuf_free(crit);
1840: sshbuf_free(exts);
1841: sshbuf_free(principals);
1.1 djm 1842: free(sig);
1843: return ret;
1844: }
1845:
1.122 djm 1846: int
1.129 djm 1847: sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key)
1.122 djm 1848: {
1.129 djm 1849: /* Parse additional security-key application string */
1850: if (sshbuf_get_cstring(b, &key->sk_application, NULL) != 0)
1851: return SSH_ERR_INVALID_FORMAT;
1.69 djm 1852: return 0;
1853: }
1854:
1855: static int
1.14 djm 1856: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1857: int allow_cert)
1.1 djm 1858: {
1.12 djm 1859: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.129 djm 1860: char *ktype = NULL;
1.1 djm 1861: struct sshkey *key = NULL;
1.14 djm 1862: struct sshbuf *copy;
1.129 djm 1863: const struct sshkey_impl *impl;
1.1 djm 1864:
1865: #ifdef DEBUG_PK /* XXX */
1.14 djm 1866: sshbuf_dump(b, stderr);
1.1 djm 1867: #endif
1.32 djm 1868: if (keyp != NULL)
1869: *keyp = NULL;
1.14 djm 1870: if ((copy = sshbuf_fromb(b)) == NULL) {
1871: ret = SSH_ERR_ALLOC_FAIL;
1872: goto out;
1873: }
1.1 djm 1874: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1875: ret = SSH_ERR_INVALID_FORMAT;
1876: goto out;
1877: }
1878:
1879: type = sshkey_type_from_name(ktype);
1880: if (!allow_cert && sshkey_type_is_cert(type)) {
1881: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1882: goto out;
1883: }
1.129 djm 1884: if ((impl = sshkey_impl_from_type(type)) == NULL) {
1885: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1886: goto out;
1887: }
1888: if ((key = sshkey_new(type)) == NULL) {
1889: ret = SSH_ERR_ALLOC_FAIL;
1890: goto out;
1891: }
1892: if (sshkey_type_is_cert(type)) {
1893: /* Skip nonce that preceeds all certificates */
1.1 djm 1894: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1895: ret = SSH_ERR_INVALID_FORMAT;
1896: goto out;
1897: }
1.129 djm 1898: }
1899: if ((ret = impl->funcs->deserialize_public(ktype, b, key)) != 0)
1.1 djm 1900: goto out;
1901:
1902: /* Parse certificate potion */
1.14 djm 1903: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 1904: goto out;
1905:
1906: if (key != NULL && sshbuf_len(b) != 0) {
1907: ret = SSH_ERR_INVALID_FORMAT;
1908: goto out;
1909: }
1910: ret = 0;
1.32 djm 1911: if (keyp != NULL) {
1912: *keyp = key;
1913: key = NULL;
1914: }
1.1 djm 1915: out:
1.14 djm 1916: sshbuf_free(copy);
1.1 djm 1917: sshkey_free(key);
1918: free(ktype);
1919: return ret;
1920: }
1921:
1922: int
1923: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
1924: {
1.14 djm 1925: struct sshbuf *b;
1926: int r;
1927:
1928: if ((b = sshbuf_from(blob, blen)) == NULL)
1929: return SSH_ERR_ALLOC_FAIL;
1930: r = sshkey_from_blob_internal(b, keyp, 1);
1931: sshbuf_free(b);
1932: return r;
1933: }
1934:
1935: int
1936: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
1937: {
1938: return sshkey_from_blob_internal(b, keyp, 1);
1939: }
1940:
1941: int
1942: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
1943: {
1944: struct sshbuf *b;
1945: int r;
1946:
1947: if ((r = sshbuf_froms(buf, &b)) != 0)
1948: return r;
1949: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 1950: sshbuf_free(b);
1951: return r;
1952: }
1953:
1.82 djm 1954: int
1955: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 1956: {
1957: int r;
1958: struct sshbuf *b = NULL;
1959: char *sigtype = NULL;
1960:
1961: if (sigtypep != NULL)
1962: *sigtypep = NULL;
1963: if ((b = sshbuf_from(sig, siglen)) == NULL)
1964: return SSH_ERR_ALLOC_FAIL;
1965: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
1966: goto out;
1967: /* success */
1968: if (sigtypep != NULL) {
1969: *sigtypep = sigtype;
1970: sigtype = NULL;
1971: }
1972: r = 0;
1973: out:
1974: free(sigtype);
1.14 djm 1975: sshbuf_free(b);
1976: return r;
1.68 djm 1977: }
1978:
1979: /*
1980: *
1981: * Checks whether a certificate's signature type is allowed.
1982: * Returns 0 (success) if the certificate signature type appears in the
1983: * "allowed" pattern-list, or the key is not a certificate to begin with.
1984: * Otherwise returns a ssherr.h code.
1985: */
1986: int
1987: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
1988: {
1989: if (key == NULL || allowed == NULL)
1990: return SSH_ERR_INVALID_ARGUMENT;
1991: if (!sshkey_type_is_cert(key->type))
1992: return 0;
1993: if (key->cert == NULL || key->cert->signature_type == NULL)
1994: return SSH_ERR_INVALID_ARGUMENT;
1995: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
1996: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
1997: return 0;
1.65 djm 1998: }
1999:
2000: /*
2001: * Returns the expected signature algorithm for a given public key algorithm.
2002: */
1.66 djm 2003: const char *
2004: sshkey_sigalg_by_name(const char *name)
1.65 djm 2005: {
1.123 djm 2006: const struct sshkey_impl *impl;
2007: int i;
1.65 djm 2008:
1.123 djm 2009: for (i = 0; keyimpls[i] != NULL; i++) {
2010: impl = keyimpls[i];
2011: if (strcmp(impl->name, name) != 0)
1.65 djm 2012: continue;
1.123 djm 2013: if (impl->sigalg != NULL)
2014: return impl->sigalg;
2015: if (!impl->cert)
2016: return impl->name;
1.65 djm 2017: return sshkey_ssh_name_from_type_nid(
1.123 djm 2018: sshkey_type_plain(impl->type), impl->nid);
1.65 djm 2019: }
2020: return NULL;
2021: }
2022:
2023: /*
2024: * Verifies that the signature algorithm appearing inside the signature blob
2025: * matches that which was requested.
2026: */
2027: int
2028: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2029: const char *requested_alg)
2030: {
2031: const char *expected_alg;
2032: char *sigtype = NULL;
2033: int r;
2034:
2035: if (requested_alg == NULL)
2036: return 0;
1.66 djm 2037: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2038: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2039: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2040: return r;
2041: r = strcmp(expected_alg, sigtype) == 0;
2042: free(sigtype);
2043: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2044: }
2045:
2046: int
1.76 djm 2047: sshkey_sign(struct sshkey *key,
1.1 djm 2048: u_char **sigp, size_t *lenp,
1.86 djm 2049: const u_char *data, size_t datalen,
1.111 djm 2050: const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
1.1 djm 2051: {
1.76 djm 2052: int was_shielded = sshkey_is_shielded(key);
2053: int r2, r = SSH_ERR_INTERNAL_ERROR;
1.130 djm 2054: const struct sshkey_impl *impl;
1.76 djm 2055:
1.1 djm 2056: if (sigp != NULL)
2057: *sigp = NULL;
2058: if (lenp != NULL)
2059: *lenp = 0;
2060: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2061: return SSH_ERR_INVALID_ARGUMENT;
1.130 djm 2062: if ((impl = sshkey_impl_from_key(key)) == NULL)
2063: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.76 djm 2064: if ((r = sshkey_unshield_private(key)) != 0)
2065: return r;
1.130 djm 2066: if (sshkey_is_sk(key)) {
1.97 djm 2067: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.111 djm 2068: datalen, compat, sk_pin);
1.130 djm 2069: } else {
2070: if (impl->funcs->sign == NULL)
2071: r = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2072: else {
2073: r = impl->funcs->sign(key, sigp, lenp, data, datalen,
2074: alg, sk_provider, sk_pin, compat);
2075: }
1.1 djm 2076: }
1.76 djm 2077: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2078: return r2;
2079: return r;
1.1 djm 2080: }
2081:
2082: /*
2083: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2084: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2085: */
2086: int
2087: sshkey_verify(const struct sshkey *key,
2088: const u_char *sig, size_t siglen,
1.96 djm 2089: const u_char *data, size_t dlen, const char *alg, u_int compat,
2090: struct sshkey_sig_details **detailsp)
1.1 djm 2091: {
1.130 djm 2092: const struct sshkey_impl *impl;
2093:
1.96 djm 2094: if (detailsp != NULL)
2095: *detailsp = NULL;
1.6 djm 2096: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2097: return SSH_ERR_INVALID_ARGUMENT;
1.130 djm 2098: if ((impl = sshkey_impl_from_key(key)) == NULL)
1.1 djm 2099: return SSH_ERR_KEY_TYPE_UNKNOWN;
1.130 djm 2100: return impl->funcs->verify(key, sig, siglen, data, dlen,
2101: alg, compat, detailsp);
1.1 djm 2102: }
2103:
2104: /* Convert a plain key to their _CERT equivalent */
2105: int
1.20 djm 2106: sshkey_to_certified(struct sshkey *k)
1.1 djm 2107: {
2108: int newtype;
2109:
1.131 djm 2110: if ((newtype = sshkey_type_certified(k->type)) == -1)
1.1 djm 2111: return SSH_ERR_INVALID_ARGUMENT;
2112: if ((k->cert = cert_new()) == NULL)
2113: return SSH_ERR_ALLOC_FAIL;
2114: k->type = newtype;
2115: return 0;
2116: }
2117:
2118: /* Convert a certificate to its raw key equivalent */
2119: int
2120: sshkey_drop_cert(struct sshkey *k)
2121: {
2122: if (!sshkey_type_is_cert(k->type))
2123: return SSH_ERR_KEY_TYPE_UNKNOWN;
2124: cert_free(k->cert);
2125: k->cert = NULL;
2126: k->type = sshkey_type_plain(k->type);
2127: return 0;
2128: }
2129:
2130: /* Sign a certified key, (re-)generating the signed certblob. */
2131: int
1.53 djm 2132: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2133: const char *sk_provider, const char *sk_pin,
2134: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2135: {
1.131 djm 2136: const struct sshkey_impl *impl;
1.1 djm 2137: struct sshbuf *principals = NULL;
2138: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2139: size_t i, ca_len, sig_len;
2140: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2141: struct sshbuf *cert = NULL;
2142: char *sigtype = NULL;
1.1 djm 2143:
2144: if (k == NULL || k->cert == NULL ||
2145: k->cert->certblob == NULL || ca == NULL)
2146: return SSH_ERR_INVALID_ARGUMENT;
2147: if (!sshkey_is_cert(k))
2148: return SSH_ERR_KEY_TYPE_UNKNOWN;
2149: if (!sshkey_type_is_valid_ca(ca->type))
2150: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1.131 djm 2151: if ((impl = sshkey_impl_from_key(k)) == NULL)
2152: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 2153:
1.67 djm 2154: /*
2155: * If no alg specified as argument but a signature_type was set,
2156: * then prefer that. If both were specified, then they must match.
2157: */
2158: if (alg == NULL)
2159: alg = k->cert->signature_type;
2160: else if (k->cert->signature_type != NULL &&
2161: strcmp(alg, k->cert->signature_type) != 0)
2162: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2163:
2164: /*
2165: * If no signing algorithm or signature_type was specified and we're
2166: * using a RSA key, then default to a good signature algorithm.
2167: */
2168: if (alg == NULL && ca->type == KEY_RSA)
2169: alg = "rsa-sha2-512";
1.67 djm 2170:
1.1 djm 2171: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2172: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2173:
2174: cert = k->cert->certblob; /* for readability */
2175: sshbuf_reset(cert);
2176: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2177: goto out;
2178:
2179: /* -v01 certs put nonce first */
2180: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2181: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2182: goto out;
1.1 djm 2183:
1.131 djm 2184: /* Public key next */
2185: if ((ret = impl->funcs->serialize_public(k, cert,
2186: SSHKEY_SERIALIZE_DEFAULT)) != 0)
1.15 djm 2187: goto out;
1.1 djm 2188:
1.131 djm 2189: /* Then remaining cert fields */
1.20 djm 2190: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2191: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2192: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2193: goto out;
2194:
2195: if ((principals = sshbuf_new()) == NULL) {
2196: ret = SSH_ERR_ALLOC_FAIL;
2197: goto out;
2198: }
2199: for (i = 0; i < k->cert->nprincipals; i++) {
2200: if ((ret = sshbuf_put_cstring(principals,
2201: k->cert->principals[i])) != 0)
2202: goto out;
2203: }
2204: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2205: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2206: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2207: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2208: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2209: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2210: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2211: goto out;
2212:
2213: /* Sign the whole mess */
1.53 djm 2214: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.111 djm 2215: sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
1.1 djm 2216: goto out;
1.67 djm 2217: /* Check and update signature_type against what was actually used */
1.82 djm 2218: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2219: goto out;
2220: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2221: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2222: goto out;
2223: }
2224: if (k->cert->signature_type == NULL) {
2225: k->cert->signature_type = sigtype;
2226: sigtype = NULL;
2227: }
1.1 djm 2228: /* Append signature and we are done */
2229: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2230: goto out;
2231: ret = 0;
2232: out:
2233: if (ret != 0)
2234: sshbuf_reset(cert);
1.29 mmcc 2235: free(sig_blob);
2236: free(ca_blob);
1.67 djm 2237: free(sigtype);
1.31 mmcc 2238: sshbuf_free(principals);
1.1 djm 2239: return ret;
1.53 djm 2240: }
2241:
2242: static int
1.76 djm 2243: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2244: const u_char *data, size_t datalen,
1.111 djm 2245: const char *alg, const char *sk_provider, const char *sk_pin,
2246: u_int compat, void *ctx)
1.53 djm 2247: {
2248: if (ctx != NULL)
2249: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2250: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
1.111 djm 2251: sk_provider, sk_pin, compat);
1.53 djm 2252: }
2253:
2254: int
1.86 djm 2255: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2256: const char *sk_provider, const char *sk_pin)
1.53 djm 2257: {
1.111 djm 2258: return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
1.86 djm 2259: default_key_sign, NULL);
1.1 djm 2260: }
2261:
2262: int
2263: sshkey_cert_check_authority(const struct sshkey *k,
1.114 djm 2264: int want_host, int require_principal, int wildcard_pattern,
1.119 djm 2265: uint64_t verify_time, const char *name, const char **reason)
1.1 djm 2266: {
2267: u_int i, principal_matches;
2268:
1.102 markus 2269: if (reason == NULL)
2270: return SSH_ERR_INVALID_ARGUMENT;
1.114 djm 2271: if (!sshkey_is_cert(k)) {
2272: *reason = "Key is not a certificate";
2273: return SSH_ERR_KEY_CERT_INVALID;
2274: }
1.1 djm 2275: if (want_host) {
2276: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2277: *reason = "Certificate invalid: not a host certificate";
2278: return SSH_ERR_KEY_CERT_INVALID;
2279: }
2280: } else {
2281: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2282: *reason = "Certificate invalid: not a user certificate";
2283: return SSH_ERR_KEY_CERT_INVALID;
2284: }
2285: }
1.119 djm 2286: if (verify_time < k->cert->valid_after) {
1.1 djm 2287: *reason = "Certificate invalid: not yet valid";
2288: return SSH_ERR_KEY_CERT_INVALID;
2289: }
1.119 djm 2290: if (verify_time >= k->cert->valid_before) {
1.1 djm 2291: *reason = "Certificate invalid: expired";
2292: return SSH_ERR_KEY_CERT_INVALID;
2293: }
2294: if (k->cert->nprincipals == 0) {
2295: if (require_principal) {
2296: *reason = "Certificate lacks principal list";
2297: return SSH_ERR_KEY_CERT_INVALID;
2298: }
2299: } else if (name != NULL) {
2300: principal_matches = 0;
2301: for (i = 0; i < k->cert->nprincipals; i++) {
1.114 djm 2302: if (wildcard_pattern) {
2303: if (match_pattern(k->cert->principals[i],
2304: name)) {
2305: principal_matches = 1;
2306: break;
2307: }
2308: } else if (strcmp(name, k->cert->principals[i]) == 0) {
1.1 djm 2309: principal_matches = 1;
2310: break;
2311: }
2312: }
2313: if (!principal_matches) {
2314: *reason = "Certificate invalid: name is not a listed "
2315: "principal";
2316: return SSH_ERR_KEY_CERT_INVALID;
2317: }
1.114 djm 2318: }
2319: return 0;
2320: }
2321:
2322: int
1.119 djm 2323: sshkey_cert_check_authority_now(const struct sshkey *k,
2324: int want_host, int require_principal, int wildcard_pattern,
2325: const char *name, const char **reason)
2326: {
2327: time_t now;
2328:
2329: if ((now = time(NULL)) < 0) {
2330: /* yikes - system clock before epoch! */
2331: *reason = "Certificate invalid: not yet valid";
2332: return SSH_ERR_KEY_CERT_INVALID;
2333: }
2334: return sshkey_cert_check_authority(k, want_host, require_principal,
2335: wildcard_pattern, (uint64_t)now, name, reason);
2336: }
2337:
2338: int
1.114 djm 2339: sshkey_cert_check_host(const struct sshkey *key, const char *host,
2340: int wildcard_principals, const char *ca_sign_algorithms,
2341: const char **reason)
2342: {
2343: int r;
2344:
1.119 djm 2345: if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
1.114 djm 2346: host, reason)) != 0)
2347: return r;
2348: if (sshbuf_len(key->cert->critical) != 0) {
2349: *reason = "Certificate contains unsupported critical options";
2350: return SSH_ERR_KEY_CERT_INVALID;
2351: }
2352: if (ca_sign_algorithms != NULL &&
2353: (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2354: *reason = "Certificate signed with disallowed algorithm";
2355: return SSH_ERR_KEY_CERT_INVALID;
1.1 djm 2356: }
2357: return 0;
1.27 djm 2358: }
2359:
2360: size_t
2361: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2362: {
1.113 dtucker 2363: char from[32], to[32], ret[128];
1.27 djm 2364:
2365: *from = *to = '\0';
2366: if (cert->valid_after == 0 &&
2367: cert->valid_before == 0xffffffffffffffffULL)
2368: return strlcpy(s, "forever", l);
2369:
1.118 dtucker 2370: if (cert->valid_after != 0)
2371: format_absolute_time(cert->valid_after, from, sizeof(from));
2372: if (cert->valid_before != 0xffffffffffffffffULL)
2373: format_absolute_time(cert->valid_before, to, sizeof(to));
1.27 djm 2374:
2375: if (cert->valid_after == 0)
2376: snprintf(ret, sizeof(ret), "before %s", to);
2377: else if (cert->valid_before == 0xffffffffffffffffULL)
2378: snprintf(ret, sizeof(ret), "after %s", from);
2379: else
2380: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2381:
2382: return strlcpy(s, ret, l);
1.1 djm 2383: }
2384:
1.132 djm 2385: /* Common serialization for FIDO private keys */
2386: int
2387: sshkey_serialize_private_sk(const struct sshkey *key, struct sshbuf *b)
2388: {
2389: int r;
2390:
2391: if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2392: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2393: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2394: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2395: return r;
2396:
2397: return 0;
2398: }
2399:
1.1 djm 2400: int
1.76 djm 2401: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2402: enum sshkey_serialize_rep opts)
1.1 djm 2403: {
2404: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2405: int was_shielded = sshkey_is_shielded(key);
2406: struct sshbuf *b = NULL;
1.132 djm 2407: const struct sshkey_impl *impl;
1.1 djm 2408:
1.132 djm 2409: if ((impl = sshkey_impl_from_key(key)) == NULL)
2410: return SSH_ERR_INTERNAL_ERROR;
1.76 djm 2411: if ((r = sshkey_unshield_private(key)) != 0)
2412: return r;
2413: if ((b = sshbuf_new()) == NULL)
2414: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2415: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2416: goto out;
1.132 djm 2417: if (sshkey_is_cert(key)) {
2418: if (key->cert == NULL ||
2419: sshbuf_len(key->cert->certblob) == 0) {
1.1 djm 2420: r = SSH_ERR_INVALID_ARGUMENT;
2421: goto out;
2422: }
1.132 djm 2423: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0)
1.1 djm 2424: goto out;
1.132 djm 2425: }
2426: if ((r = impl->funcs->serialize_private(key, b, opts)) != 0)
1.1 djm 2427: goto out;
1.132 djm 2428:
1.76 djm 2429: /*
2430: * success (but we still need to append the output to buf after
2431: * possibly re-shielding the private key)
2432: */
1.1 djm 2433: r = 0;
2434: out:
1.76 djm 2435: if (was_shielded)
2436: r = sshkey_shield_private(key);
2437: if (r == 0)
2438: r = sshbuf_putb(buf, b);
2439: sshbuf_free(b);
2440:
1.1 djm 2441: return r;
2442: }
2443:
2444: int
1.76 djm 2445: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 2446: {
2447: return sshkey_private_serialize_opt(key, b,
2448: SSHKEY_SERIALIZE_DEFAULT);
2449: }
2450:
1.133 djm 2451: /* Shared deserialization of FIDO private key components */
2452: int
2453: sshkey_private_deserialize_sk(struct sshbuf *buf, struct sshkey *k)
2454: {
2455: int r;
2456:
2457: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2458: (k->sk_reserved = sshbuf_new()) == NULL)
2459: return SSH_ERR_ALLOC_FAIL;
2460: if ((r = sshbuf_get_cstring(buf, &k->sk_application, NULL)) != 0 ||
2461: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2462: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2463: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2464: return r;
2465:
2466: return 0;
2467: }
2468:
1.62 markus 2469: int
1.1 djm 2470: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2471: {
1.133 djm 2472: const struct sshkey_impl *impl;
2473: char *tname = NULL;
1.115 djm 2474: char *expect_sk_application = NULL;
1.133 djm 2475: u_char *expect_ed25519_pk = NULL;
1.1 djm 2476: struct sshkey *k = NULL;
2477: int type, r = SSH_ERR_INTERNAL_ERROR;
2478:
2479: if (kp != NULL)
2480: *kp = NULL;
2481: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2482: goto out;
2483: type = sshkey_type_from_name(tname);
1.108 djm 2484: if (sshkey_type_is_cert(type)) {
2485: /*
2486: * Certificate key private keys begin with the certificate
2487: * itself. Make sure this matches the type of the enclosing
2488: * private key.
2489: */
2490: if ((r = sshkey_froms(buf, &k)) != 0)
2491: goto out;
2492: if (k->type != type) {
2493: r = SSH_ERR_KEY_CERT_MISMATCH;
2494: goto out;
2495: }
2496: /* For ECDSA keys, the group must match too */
2497: if (k->type == KEY_ECDSA &&
2498: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2499: r = SSH_ERR_KEY_CERT_MISMATCH;
2500: goto out;
2501: }
1.115 djm 2502: /*
2503: * Several fields are redundant between certificate and
2504: * private key body, we require these to match.
2505: */
2506: expect_sk_application = k->sk_application;
2507: expect_ed25519_pk = k->ed25519_pk;
2508: k->sk_application = NULL;
2509: k->ed25519_pk = NULL;
1.133 djm 2510: /* XXX xmss too or refactor */
1.108 djm 2511: } else {
1.70 djm 2512: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2513: r = SSH_ERR_ALLOC_FAIL;
2514: goto out;
2515: }
1.108 djm 2516: }
1.133 djm 2517: if ((impl = sshkey_impl_from_type(type)) == NULL) {
2518: r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 2519: goto out;
2520: }
1.133 djm 2521: if ((r = impl->funcs->deserialize_private(tname, buf, k)) != 0)
2522: goto out;
2523:
2524: /* XXX xmss too or refactor */
1.115 djm 2525: if ((expect_sk_application != NULL && (k->sk_application == NULL ||
2526: strcmp(expect_sk_application, k->sk_application) != 0)) ||
2527: (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
1.116 djm 2528: memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
1.115 djm 2529: r = SSH_ERR_KEY_CERT_MISMATCH;
2530: goto out;
2531: }
1.1 djm 2532: /* success */
2533: r = 0;
2534: if (kp != NULL) {
2535: *kp = k;
2536: k = NULL;
2537: }
2538: out:
2539: free(tname);
2540: sshkey_free(k);
1.115 djm 2541: free(expect_sk_application);
2542: free(expect_ed25519_pk);
1.1 djm 2543: return r;
2544: }
2545:
2546: #ifdef WITH_OPENSSL
2547: int
2548: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2549: {
2550: EC_POINT *nq = NULL;
1.93 djm 2551: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 2552: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2553:
2554: /*
2555: * NB. This assumes OpenSSL has already verified that the public
2556: * point lies on the curve. This is done by EC_POINT_oct2point()
2557: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2558: * reachable with public points not unmarshalled using
2559: * EC_POINT_oct2point then the caller will need to explicitly check.
2560: */
1.1 djm 2561:
2562: /*
2563: * We shouldn't ever hit this case because bignum_get_ecpoint()
2564: * refuses to load GF2m points.
2565: */
2566: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2567: NID_X9_62_prime_field)
2568: goto out;
2569:
2570: /* Q != infinity */
2571: if (EC_POINT_is_at_infinity(group, public))
2572: goto out;
2573:
1.93 djm 2574: if ((x = BN_new()) == NULL ||
2575: (y = BN_new()) == NULL ||
2576: (order = BN_new()) == NULL ||
2577: (tmp = BN_new()) == NULL) {
1.1 djm 2578: ret = SSH_ERR_ALLOC_FAIL;
2579: goto out;
2580: }
2581:
2582: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 2583: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 2584: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 2585: x, y, NULL) != 1) {
1.1 djm 2586: ret = SSH_ERR_LIBCRYPTO_ERROR;
2587: goto out;
2588: }
2589: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2590: BN_num_bits(y) <= BN_num_bits(order) / 2)
2591: goto out;
2592:
2593: /* nQ == infinity (n == order of subgroup) */
2594: if ((nq = EC_POINT_new(group)) == NULL) {
2595: ret = SSH_ERR_ALLOC_FAIL;
2596: goto out;
2597: }
1.93 djm 2598: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 2599: ret = SSH_ERR_LIBCRYPTO_ERROR;
2600: goto out;
2601: }
2602: if (EC_POINT_is_at_infinity(group, nq) != 1)
2603: goto out;
2604:
2605: /* x < order - 1, y < order - 1 */
2606: if (!BN_sub(tmp, order, BN_value_one())) {
2607: ret = SSH_ERR_LIBCRYPTO_ERROR;
2608: goto out;
2609: }
2610: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2611: goto out;
2612: ret = 0;
2613: out:
1.93 djm 2614: BN_clear_free(x);
2615: BN_clear_free(y);
2616: BN_clear_free(order);
2617: BN_clear_free(tmp);
1.60 jsing 2618: EC_POINT_free(nq);
1.1 djm 2619: return ret;
2620: }
2621:
2622: int
2623: sshkey_ec_validate_private(const EC_KEY *key)
2624: {
1.93 djm 2625: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 2626: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2627:
1.93 djm 2628: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 2629: ret = SSH_ERR_ALLOC_FAIL;
2630: goto out;
2631: }
2632:
2633: /* log2(private) > log2(order)/2 */
1.93 djm 2634: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 2635: ret = SSH_ERR_LIBCRYPTO_ERROR;
2636: goto out;
2637: }
2638: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2639: BN_num_bits(order) / 2)
2640: goto out;
2641:
2642: /* private < order - 1 */
2643: if (!BN_sub(tmp, order, BN_value_one())) {
2644: ret = SSH_ERR_LIBCRYPTO_ERROR;
2645: goto out;
2646: }
2647: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2648: goto out;
2649: ret = 0;
2650: out:
1.93 djm 2651: BN_clear_free(order);
2652: BN_clear_free(tmp);
1.1 djm 2653: return ret;
2654: }
2655:
2656: void
2657: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2658: {
1.93 djm 2659: BIGNUM *x = NULL, *y = NULL;
1.1 djm 2660:
2661: if (point == NULL) {
2662: fputs("point=(NULL)\n", stderr);
2663: return;
2664: }
1.93 djm 2665: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
2666: fprintf(stderr, "%s: BN_new failed\n", __func__);
2667: goto out;
1.1 djm 2668: }
2669: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2670: NID_X9_62_prime_field) {
2671: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 2672: goto out;
1.1 djm 2673: }
1.93 djm 2674: if (EC_POINT_get_affine_coordinates_GFp(group, point,
2675: x, y, NULL) != 1) {
1.1 djm 2676: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2677: __func__);
1.93 djm 2678: goto out;
1.1 djm 2679: }
2680: fputs("x=", stderr);
2681: BN_print_fp(stderr, x);
2682: fputs("\ny=", stderr);
2683: BN_print_fp(stderr, y);
2684: fputs("\n", stderr);
1.93 djm 2685: out:
2686: BN_clear_free(x);
2687: BN_clear_free(y);
1.1 djm 2688: }
2689:
2690: void
2691: sshkey_dump_ec_key(const EC_KEY *key)
2692: {
2693: const BIGNUM *exponent;
2694:
2695: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2696: EC_KEY_get0_public_key(key));
2697: fputs("exponent=", stderr);
2698: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2699: fputs("(NULL)", stderr);
2700: else
2701: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2702: fputs("\n", stderr);
2703: }
2704: #endif /* WITH_OPENSSL */
2705:
2706: static int
1.76 djm 2707: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 2708: const char *passphrase, const char *comment, const char *ciphername,
2709: int rounds)
2710: {
1.4 djm 2711: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2712: u_char salt[SALT_LEN];
1.4 djm 2713: char *b64 = NULL;
1.1 djm 2714: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2715: u_int check;
2716: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 2717: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 2718: const struct sshcipher *cipher;
2719: const char *kdfname = KDFNAME;
2720: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2721:
2722: if (rounds <= 0)
2723: rounds = DEFAULT_ROUNDS;
2724: if (passphrase == NULL || !strlen(passphrase)) {
2725: ciphername = "none";
2726: kdfname = "none";
2727: } else if (ciphername == NULL)
2728: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 2729: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 2730: r = SSH_ERR_INVALID_ARGUMENT;
2731: goto out;
2732: }
2733:
2734: if ((kdf = sshbuf_new()) == NULL ||
2735: (encoded = sshbuf_new()) == NULL ||
2736: (encrypted = sshbuf_new()) == NULL) {
2737: r = SSH_ERR_ALLOC_FAIL;
2738: goto out;
2739: }
2740: blocksize = cipher_blocksize(cipher);
2741: keylen = cipher_keylen(cipher);
2742: ivlen = cipher_ivlen(cipher);
2743: authlen = cipher_authlen(cipher);
2744: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2745: r = SSH_ERR_ALLOC_FAIL;
2746: goto out;
2747: }
2748: if (strcmp(kdfname, "bcrypt") == 0) {
2749: arc4random_buf(salt, SALT_LEN);
2750: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2751: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2752: r = SSH_ERR_INVALID_ARGUMENT;
2753: goto out;
2754: }
2755: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2756: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2757: goto out;
2758: } else if (strcmp(kdfname, "none") != 0) {
2759: /* Unsupported KDF type */
2760: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2761: goto out;
2762: }
2763: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2764: key + keylen, ivlen, 1)) != 0)
2765: goto out;
2766:
2767: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
2768: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
2769: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
2770: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
2771: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
2772: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
2773: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
2774: goto out;
2775:
2776: /* set up the buffer that will be encrypted */
2777:
2778: /* Random check bytes */
2779: check = arc4random();
2780: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
2781: (r = sshbuf_put_u32(encrypted, check)) != 0)
2782: goto out;
2783:
2784: /* append private key and comment*/
1.62 markus 2785: if ((r = sshkey_private_serialize_opt(prv, encrypted,
1.116 djm 2786: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 2787: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
2788: goto out;
2789:
2790: /* padding */
2791: i = 0;
2792: while (sshbuf_len(encrypted) % blocksize) {
2793: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
2794: goto out;
2795: }
2796:
2797: /* length in destination buffer */
2798: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
2799: goto out;
2800:
2801: /* encrypt */
2802: if ((r = sshbuf_reserve(encoded,
2803: sshbuf_len(encrypted) + authlen, &cp)) != 0)
2804: goto out;
1.36 djm 2805: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 2806: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
2807: goto out;
2808:
1.81 djm 2809: sshbuf_reset(blob);
1.1 djm 2810:
1.81 djm 2811: /* assemble uuencoded key */
2812: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
2813: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
2814: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 2815: goto out;
2816:
2817: /* success */
2818: r = 0;
2819:
2820: out:
2821: sshbuf_free(kdf);
2822: sshbuf_free(encoded);
2823: sshbuf_free(encrypted);
1.36 djm 2824: cipher_free(ciphercontext);
1.1 djm 2825: explicit_bzero(salt, sizeof(salt));
1.100 jsg 2826: if (key != NULL)
2827: freezero(key, keylen + ivlen);
1.121 djm 2828: if (pubkeyblob != NULL)
1.100 jsg 2829: freezero(pubkeyblob, pubkeylen);
1.121 djm 2830: if (b64 != NULL)
1.100 jsg 2831: freezero(b64, strlen(b64));
1.1 djm 2832: return r;
2833: }
2834:
2835: static int
1.103 djm 2836: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 2837: {
2838: const u_char *cp;
2839: size_t encoded_len;
1.103 djm 2840: int r;
2841: u_char last;
1.1 djm 2842: struct sshbuf *encoded = NULL, *decoded = NULL;
2843:
1.103 djm 2844: if (blob == NULL || decodedp == NULL)
2845: return SSH_ERR_INVALID_ARGUMENT;
2846:
2847: *decodedp = NULL;
1.1 djm 2848:
2849: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 2850: (decoded = sshbuf_new()) == NULL) {
1.1 djm 2851: r = SSH_ERR_ALLOC_FAIL;
2852: goto out;
2853: }
2854:
2855: /* check preamble */
2856: cp = sshbuf_ptr(blob);
2857: encoded_len = sshbuf_len(blob);
2858: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
2859: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
2860: r = SSH_ERR_INVALID_FORMAT;
2861: goto out;
2862: }
2863: cp += MARK_BEGIN_LEN;
2864: encoded_len -= MARK_BEGIN_LEN;
2865:
2866: /* Look for end marker, removing whitespace as we go */
2867: while (encoded_len > 0) {
2868: if (*cp != '\n' && *cp != '\r') {
2869: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
2870: goto out;
2871: }
2872: last = *cp;
2873: encoded_len--;
2874: cp++;
2875: if (last == '\n') {
2876: if (encoded_len >= MARK_END_LEN &&
2877: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
2878: /* \0 terminate */
2879: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
2880: goto out;
2881: break;
2882: }
2883: }
2884: }
2885: if (encoded_len == 0) {
2886: r = SSH_ERR_INVALID_FORMAT;
2887: goto out;
2888: }
2889:
2890: /* decode base64 */
1.4 djm 2891: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 2892: goto out;
2893:
2894: /* check magic */
2895: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
2896: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
2897: r = SSH_ERR_INVALID_FORMAT;
2898: goto out;
2899: }
1.103 djm 2900: /* success */
2901: *decodedp = decoded;
2902: decoded = NULL;
2903: r = 0;
2904: out:
2905: sshbuf_free(encoded);
2906: sshbuf_free(decoded);
2907: return r;
2908: }
2909:
2910: static int
1.104 djm 2911: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
2912: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 2913: {
2914: char *ciphername = NULL, *kdfname = NULL;
2915: const struct sshcipher *cipher = NULL;
2916: int r = SSH_ERR_INTERNAL_ERROR;
2917: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
2918: struct sshbuf *kdf = NULL, *decrypted = NULL;
2919: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 2920: struct sshkey *pubkey = NULL;
1.103 djm 2921: u_char *key = NULL, *salt = NULL, *dp;
2922: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
2923:
1.104 djm 2924: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 2925: return SSH_ERR_INVALID_ARGUMENT;
2926:
2927: *decryptedp = NULL;
1.104 djm 2928: *pubkeyp = NULL;
1.103 djm 2929:
2930: if ((decrypted = sshbuf_new()) == NULL) {
2931: r = SSH_ERR_ALLOC_FAIL;
2932: goto out;
2933: }
2934:
1.1 djm 2935: /* parse public portion of key */
2936: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
2937: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
2938: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
2939: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 2940: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
2941: goto out;
2942:
2943: if (nkeys != 1) {
2944: /* XXX only one key supported at present */
2945: r = SSH_ERR_INVALID_FORMAT;
2946: goto out;
2947: }
2948:
1.104 djm 2949: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 2950: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
2951: goto out;
2952:
2953: if ((cipher = cipher_by_name(ciphername)) == NULL) {
2954: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2955: goto out;
2956: }
2957: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
2958: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2959: goto out;
2960: }
1.101 markus 2961: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 2962: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 2963: goto out;
2964: }
2965: if ((passphrase == NULL || strlen(passphrase) == 0) &&
2966: strcmp(kdfname, "none") != 0) {
2967: /* passphrase required */
2968: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 2969: goto out;
2970: }
2971:
2972: /* check size of encrypted key blob */
2973: blocksize = cipher_blocksize(cipher);
2974: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
2975: r = SSH_ERR_INVALID_FORMAT;
2976: goto out;
2977: }
2978:
2979: /* setup key */
2980: keylen = cipher_keylen(cipher);
2981: ivlen = cipher_ivlen(cipher);
1.18 djm 2982: authlen = cipher_authlen(cipher);
1.1 djm 2983: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2984: r = SSH_ERR_ALLOC_FAIL;
2985: goto out;
2986: }
2987: if (strcmp(kdfname, "bcrypt") == 0) {
2988: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
2989: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
2990: goto out;
2991: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
2992: key, keylen + ivlen, rounds) < 0) {
2993: r = SSH_ERR_INVALID_FORMAT;
2994: goto out;
2995: }
2996: }
2997:
1.18 djm 2998: /* check that an appropriate amount of auth data is present */
1.84 djm 2999: if (sshbuf_len(decoded) < authlen ||
3000: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 3001: r = SSH_ERR_INVALID_FORMAT;
3002: goto out;
3003: }
3004:
1.1 djm 3005: /* decrypt private portion of key */
3006: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3007: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3008: key + keylen, ivlen, 0)) != 0)
3009: goto out;
1.36 djm 3010: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3011: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3012: /* an integrity error here indicates an incorrect passphrase */
3013: if (r == SSH_ERR_MAC_INVALID)
3014: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3015: goto out;
3016: }
1.18 djm 3017: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3018: goto out;
3019: /* there should be no trailing data */
3020: if (sshbuf_len(decoded) != 0) {
3021: r = SSH_ERR_INVALID_FORMAT;
3022: goto out;
3023: }
3024:
3025: /* check check bytes */
3026: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3027: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3028: goto out;
3029: if (check1 != check2) {
3030: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3031: goto out;
3032: }
1.103 djm 3033: /* success */
3034: *decryptedp = decrypted;
3035: decrypted = NULL;
1.104 djm 3036: *pubkeyp = pubkey;
3037: pubkey = NULL;
1.103 djm 3038: r = 0;
3039: out:
3040: cipher_free(ciphercontext);
3041: free(ciphername);
3042: free(kdfname);
1.104 djm 3043: sshkey_free(pubkey);
1.103 djm 3044: if (salt != NULL) {
3045: explicit_bzero(salt, slen);
3046: free(salt);
3047: }
3048: if (key != NULL) {
3049: explicit_bzero(key, keylen + ivlen);
3050: free(key);
3051: }
3052: sshbuf_free(kdf);
3053: sshbuf_free(decrypted);
3054: return r;
3055: }
3056:
3057: static int
3058: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3059: struct sshkey **keyp, char **commentp)
3060: {
3061: char *comment = NULL;
3062: int r = SSH_ERR_INTERNAL_ERROR;
3063: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 3064: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 3065:
3066: if (keyp != NULL)
3067: *keyp = NULL;
3068: if (commentp != NULL)
3069: *commentp = NULL;
3070:
3071: /* Undo base64 encoding and decrypt the private section */
3072: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 3073: (r = private2_decrypt(decoded, passphrase,
3074: &decrypted, &pubkey)) != 0)
1.103 djm 3075: goto out;
1.105 djm 3076:
3077: if (type != KEY_UNSPEC &&
3078: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3079: r = SSH_ERR_KEY_TYPE_MISMATCH;
3080: goto out;
3081: }
1.103 djm 3082:
3083: /* Load the private key and comment */
3084: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3085: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3086: goto out;
3087:
3088: /* Check deterministic padding after private section */
3089: if ((r = private2_check_padding(decrypted)) != 0)
3090: goto out;
1.1 djm 3091:
1.104 djm 3092: /* Check that the public key in the envelope matches the private key */
3093: if (!sshkey_equal(pubkey, k)) {
3094: r = SSH_ERR_INVALID_FORMAT;
3095: goto out;
3096: }
1.1 djm 3097:
3098: /* success */
3099: r = 0;
3100: if (keyp != NULL) {
3101: *keyp = k;
3102: k = NULL;
3103: }
3104: if (commentp != NULL) {
3105: *commentp = comment;
3106: comment = NULL;
3107: }
3108: out:
3109: free(comment);
3110: sshbuf_free(decoded);
3111: sshbuf_free(decrypted);
3112: sshkey_free(k);
1.104 djm 3113: sshkey_free(pubkey);
1.1 djm 3114: return r;
3115: }
3116:
1.107 djm 3117: static int
3118: sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3119: struct sshkey **keyp)
3120: {
3121: int r = SSH_ERR_INTERNAL_ERROR;
3122: struct sshbuf *decoded = NULL;
3123: struct sshkey *pubkey = NULL;
3124: u_int nkeys = 0;
3125:
3126: if (keyp != NULL)
3127: *keyp = NULL;
3128:
3129: if ((r = private2_uudecode(blob, &decoded)) != 0)
3130: goto out;
3131: /* parse public key from unencrypted envelope */
3132: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3133: (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
3134: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
3135: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
3136: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3137: goto out;
3138:
3139: if (nkeys != 1) {
3140: /* XXX only one key supported at present */
3141: r = SSH_ERR_INVALID_FORMAT;
3142: goto out;
3143: }
3144:
3145: /* Parse the public key */
3146: if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3147: goto out;
3148:
3149: if (type != KEY_UNSPEC &&
3150: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3151: r = SSH_ERR_KEY_TYPE_MISMATCH;
3152: goto out;
3153: }
3154:
3155: /* success */
3156: r = 0;
3157: if (keyp != NULL) {
3158: *keyp = pubkey;
3159: pubkey = NULL;
3160: }
3161: out:
3162: sshbuf_free(decoded);
3163: sshkey_free(pubkey);
3164: return r;
3165: }
3166:
1.1 djm 3167: #ifdef WITH_OPENSSL
1.80 djm 3168: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3169: static int
1.80 djm 3170: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3171: int format, const char *_passphrase, const char *comment)
1.1 djm 3172: {
1.76 djm 3173: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3174: int success, r;
3175: int blen, len = strlen(_passphrase);
3176: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3177: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3178: char *bptr;
1.1 djm 3179: BIO *bio = NULL;
1.76 djm 3180: struct sshbuf *blob;
1.80 djm 3181: EVP_PKEY *pkey = NULL;
1.1 djm 3182:
3183: if (len > 0 && len <= 4)
3184: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3185: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3186: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3187: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3188: r = SSH_ERR_ALLOC_FAIL;
3189: goto out;
3190: }
3191: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3192: r = SSH_ERR_ALLOC_FAIL;
3193: goto out;
1.76 djm 3194: }
3195: if ((r = sshkey_unshield_private(key)) != 0)
3196: goto out;
1.1 djm 3197:
3198: switch (key->type) {
3199: case KEY_DSA:
1.80 djm 3200: if (format == SSHKEY_PRIVATE_PEM) {
3201: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3202: cipher, passphrase, len, NULL, NULL);
3203: } else {
3204: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3205: }
1.1 djm 3206: break;
3207: case KEY_ECDSA:
1.80 djm 3208: if (format == SSHKEY_PRIVATE_PEM) {
3209: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3210: cipher, passphrase, len, NULL, NULL);
3211: } else {
3212: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3213: }
1.1 djm 3214: break;
3215: case KEY_RSA:
1.80 djm 3216: if (format == SSHKEY_PRIVATE_PEM) {
3217: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3218: cipher, passphrase, len, NULL, NULL);
3219: } else {
3220: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3221: }
1.1 djm 3222: break;
3223: default:
3224: success = 0;
3225: break;
3226: }
3227: if (success == 0) {
3228: r = SSH_ERR_LIBCRYPTO_ERROR;
3229: goto out;
3230: }
1.80 djm 3231: if (format == SSHKEY_PRIVATE_PKCS8) {
3232: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3233: passphrase, len, NULL, NULL)) == 0) {
3234: r = SSH_ERR_LIBCRYPTO_ERROR;
3235: goto out;
3236: }
3237: }
1.1 djm 3238: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3239: r = SSH_ERR_INTERNAL_ERROR;
3240: goto out;
3241: }
3242: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3243: goto out;
3244: r = 0;
3245: out:
1.76 djm 3246: if (was_shielded)
3247: r = sshkey_shield_private(key);
3248: if (r == 0)
3249: r = sshbuf_putb(buf, blob);
1.80 djm 3250:
3251: EVP_PKEY_free(pkey);
1.76 djm 3252: sshbuf_free(blob);
1.1 djm 3253: BIO_free(bio);
3254: return r;
3255: }
3256: #endif /* WITH_OPENSSL */
3257:
3258: /* Serialise "key" to buffer "blob" */
3259: int
3260: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3261: const char *passphrase, const char *comment,
1.80 djm 3262: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 3263: {
3264: switch (key->type) {
1.9 markus 3265: #ifdef WITH_OPENSSL
1.1 djm 3266: case KEY_DSA:
3267: case KEY_ECDSA:
3268: case KEY_RSA:
1.80 djm 3269: break; /* see below */
1.1 djm 3270: #endif /* WITH_OPENSSL */
3271: case KEY_ED25519:
1.90 markus 3272: case KEY_ED25519_SK:
1.62 markus 3273: #ifdef WITH_XMSS
3274: case KEY_XMSS:
3275: #endif /* WITH_XMSS */
1.85 djm 3276: #ifdef WITH_OPENSSL
3277: case KEY_ECDSA_SK:
3278: #endif /* WITH_OPENSSL */
1.1 djm 3279: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 3280: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 3281: default:
3282: return SSH_ERR_KEY_TYPE_UNKNOWN;
3283: }
1.80 djm 3284:
3285: #ifdef WITH_OPENSSL
3286: switch (format) {
3287: case SSHKEY_PRIVATE_OPENSSH:
3288: return sshkey_private_to_blob2(key, blob, passphrase,
3289: comment, openssh_format_cipher, openssh_format_rounds);
3290: case SSHKEY_PRIVATE_PEM:
3291: case SSHKEY_PRIVATE_PKCS8:
3292: return sshkey_private_to_blob_pem_pkcs8(key, blob,
3293: format, passphrase, comment);
3294: default:
3295: return SSH_ERR_INVALID_ARGUMENT;
3296: }
3297: #endif /* WITH_OPENSSL */
1.1 djm 3298: }
3299:
3300: #ifdef WITH_OPENSSL
1.8 djm 3301: static int
1.52 djm 3302: translate_libcrypto_error(unsigned long pem_err)
3303: {
3304: int pem_reason = ERR_GET_REASON(pem_err);
3305:
3306: switch (ERR_GET_LIB(pem_err)) {
3307: case ERR_LIB_PEM:
3308: switch (pem_reason) {
3309: case PEM_R_BAD_PASSWORD_READ:
3310: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3311: case PEM_R_BAD_DECRYPT:
3312: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3313: default:
3314: return SSH_ERR_INVALID_FORMAT;
3315: }
3316: case ERR_LIB_EVP:
3317: switch (pem_reason) {
3318: case EVP_R_BAD_DECRYPT:
3319: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3320: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3321: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3322: #endif
1.52 djm 3323: case EVP_R_DECODE_ERROR:
3324: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3325: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3326: #endif
3327: return SSH_ERR_INVALID_FORMAT;
3328: default:
3329: return SSH_ERR_LIBCRYPTO_ERROR;
3330: }
3331: case ERR_LIB_ASN1:
3332: return SSH_ERR_INVALID_FORMAT;
3333: }
3334: return SSH_ERR_LIBCRYPTO_ERROR;
3335: }
3336:
3337: static void
3338: clear_libcrypto_errors(void)
3339: {
3340: while (ERR_get_error() != 0)
3341: ;
3342: }
3343:
3344: /*
3345: * Translate OpenSSL error codes to determine whether
3346: * passphrase is required/incorrect.
3347: */
3348: static int
3349: convert_libcrypto_error(void)
3350: {
3351: /*
3352: * Some password errors are reported at the beginning
3353: * of the error queue.
3354: */
3355: if (translate_libcrypto_error(ERR_peek_error()) ==
3356: SSH_ERR_KEY_WRONG_PASSPHRASE)
3357: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3358: return translate_libcrypto_error(ERR_peek_last_error());
3359: }
3360:
3361: static int
1.1 djm 3362: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3363: const char *passphrase, struct sshkey **keyp)
1.1 djm 3364: {
3365: EVP_PKEY *pk = NULL;
3366: struct sshkey *prv = NULL;
3367: BIO *bio = NULL;
3368: int r;
3369:
1.32 djm 3370: if (keyp != NULL)
3371: *keyp = NULL;
1.1 djm 3372:
3373: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3374: return SSH_ERR_ALLOC_FAIL;
3375: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3376: (int)sshbuf_len(blob)) {
3377: r = SSH_ERR_ALLOC_FAIL;
3378: goto out;
3379: }
3380:
1.52 djm 3381: clear_libcrypto_errors();
1.1 djm 3382: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3383: (char *)passphrase)) == NULL) {
1.116 djm 3384: /*
3385: * libcrypto may return various ASN.1 errors when attempting
3386: * to parse a key with an incorrect passphrase.
3387: * Treat all format errors as "incorrect passphrase" if a
3388: * passphrase was supplied.
3389: */
1.71 djm 3390: if (passphrase != NULL && *passphrase != '\0')
3391: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3392: else
3393: r = convert_libcrypto_error();
1.1 djm 3394: goto out;
3395: }
1.69 djm 3396: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3397: (type == KEY_UNSPEC || type == KEY_RSA)) {
3398: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3399: r = SSH_ERR_ALLOC_FAIL;
3400: goto out;
3401: }
3402: prv->rsa = EVP_PKEY_get1_RSA(pk);
3403: prv->type = KEY_RSA;
3404: #ifdef DEBUG_PK
3405: RSA_print_fp(stderr, prv->rsa, 8);
3406: #endif
3407: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3408: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3409: goto out;
3410: }
1.122 djm 3411: if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
1.1 djm 3412: goto out;
1.69 djm 3413: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3414: (type == KEY_UNSPEC || type == KEY_DSA)) {
3415: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3416: r = SSH_ERR_ALLOC_FAIL;
3417: goto out;
3418: }
3419: prv->dsa = EVP_PKEY_get1_DSA(pk);
3420: prv->type = KEY_DSA;
3421: #ifdef DEBUG_PK
3422: DSA_print_fp(stderr, prv->dsa, 8);
3423: #endif
1.69 djm 3424: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3425: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3426: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3427: r = SSH_ERR_ALLOC_FAIL;
3428: goto out;
3429: }
3430: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3431: prv->type = KEY_ECDSA;
3432: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3433: if (prv->ecdsa_nid == -1 ||
3434: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3435: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3436: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3437: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3438: r = SSH_ERR_INVALID_FORMAT;
3439: goto out;
3440: }
3441: #ifdef DEBUG_PK
3442: if (prv != NULL && prv->ecdsa != NULL)
3443: sshkey_dump_ec_key(prv->ecdsa);
3444: #endif
3445: } else {
3446: r = SSH_ERR_INVALID_FORMAT;
3447: goto out;
3448: }
3449: r = 0;
1.32 djm 3450: if (keyp != NULL) {
3451: *keyp = prv;
3452: prv = NULL;
3453: }
1.1 djm 3454: out:
3455: BIO_free(bio);
1.60 jsing 3456: EVP_PKEY_free(pk);
1.30 mmcc 3457: sshkey_free(prv);
1.1 djm 3458: return r;
3459: }
3460: #endif /* WITH_OPENSSL */
3461:
3462: int
3463: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3464: const char *passphrase, struct sshkey **keyp, char **commentp)
3465: {
1.42 djm 3466: int r = SSH_ERR_INTERNAL_ERROR;
3467:
1.32 djm 3468: if (keyp != NULL)
3469: *keyp = NULL;
1.1 djm 3470: if (commentp != NULL)
3471: *commentp = NULL;
3472:
3473: switch (type) {
3474: case KEY_ED25519:
1.62 markus 3475: case KEY_XMSS:
1.106 djm 3476: /* No fallback for new-format-only keys */
1.1 djm 3477: return sshkey_parse_private2(blob, type, passphrase,
3478: keyp, commentp);
1.106 djm 3479: default:
1.42 djm 3480: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3481: commentp);
1.106 djm 3482: /* Only fallback to PEM parser if a format error occurred. */
3483: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 3484: return r;
1.1 djm 3485: #ifdef WITH_OPENSSL
1.8 djm 3486: return sshkey_parse_private_pem_fileblob(blob, type,
3487: passphrase, keyp);
1.1 djm 3488: #else
3489: return SSH_ERR_INVALID_FORMAT;
3490: #endif /* WITH_OPENSSL */
3491: }
3492: }
3493:
3494: int
3495: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3496: struct sshkey **keyp, char **commentp)
1.1 djm 3497: {
3498: if (keyp != NULL)
3499: *keyp = NULL;
3500: if (commentp != NULL)
3501: *commentp = NULL;
3502:
1.23 tim 3503: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3504: passphrase, keyp, commentp);
1.96 djm 3505: }
3506:
3507: void
3508: sshkey_sig_details_free(struct sshkey_sig_details *details)
3509: {
3510: freezero(details, sizeof(*details));
1.107 djm 3511: }
3512:
3513: int
3514: sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
3515: struct sshkey **pubkeyp)
3516: {
3517: int r = SSH_ERR_INTERNAL_ERROR;
3518:
3519: if (pubkeyp != NULL)
3520: *pubkeyp = NULL;
3521: /* only new-format private keys bundle a public key inside */
3522: if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
3523: return r;
3524: return 0;
1.1 djm 3525: }
1.62 markus 3526:
3527: #ifdef WITH_XMSS
3528: /*
3529: * serialize the key with the current state and forward the state
3530: * maxsign times.
3531: */
3532: int
1.77 djm 3533: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3534: u_int32_t maxsign, int printerror)
1.62 markus 3535: {
3536: int r, rupdate;
3537:
3538: if (maxsign == 0 ||
3539: sshkey_type_plain(k->type) != KEY_XMSS)
3540: return sshkey_private_serialize_opt(k, b,
3541: SSHKEY_SERIALIZE_DEFAULT);
1.112 dtucker 3542: if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
1.62 markus 3543: (r = sshkey_private_serialize_opt(k, b,
3544: SSHKEY_SERIALIZE_STATE)) != 0 ||
3545: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3546: goto out;
3547: r = 0;
3548: out:
1.112 dtucker 3549: if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
1.62 markus 3550: if (r == 0)
3551: r = rupdate;
3552: }
3553: return r;
3554: }
3555:
3556: u_int32_t
3557: sshkey_signatures_left(const struct sshkey *k)
3558: {
3559: if (sshkey_type_plain(k->type) == KEY_XMSS)
3560: return sshkey_xmss_signatures_left(k);
3561: return 0;
3562: }
3563:
3564: int
3565: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3566: {
3567: if (sshkey_type_plain(k->type) != KEY_XMSS)
3568: return SSH_ERR_INVALID_ARGUMENT;
3569: return sshkey_xmss_enable_maxsign(k, maxsign);
3570: }
3571:
3572: int
3573: sshkey_set_filename(struct sshkey *k, const char *filename)
3574: {
3575: if (k == NULL)
3576: return SSH_ERR_INVALID_ARGUMENT;
3577: if (sshkey_type_plain(k->type) != KEY_XMSS)
3578: return 0;
3579: if (filename == NULL)
3580: return SSH_ERR_INVALID_ARGUMENT;
3581: if ((k->xmss_filename = strdup(filename)) == NULL)
3582: return SSH_ERR_ALLOC_FAIL;
3583: return 0;
3584: }
3585: #else
3586: int
1.76 djm 3587: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 3588: u_int32_t maxsign, int printerror)
1.62 markus 3589: {
3590: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
3591: }
3592:
3593: u_int32_t
3594: sshkey_signatures_left(const struct sshkey *k)
3595: {
3596: return 0;
3597: }
3598:
3599: int
3600: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3601: {
3602: return SSH_ERR_INVALID_ARGUMENT;
3603: }
3604:
3605: int
3606: sshkey_set_filename(struct sshkey *k, const char *filename)
3607: {
3608: if (k == NULL)
3609: return SSH_ERR_INVALID_ARGUMENT;
3610: return 0;
3611: }
3612: #endif /* WITH_XMSS */
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