Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.124
1.124 ! djm 1: /* $OpenBSD: sshkey.c,v 1.123 2022/10/28 00:35:40 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:
1.1 djm 174: const char *
175: sshkey_type(const struct sshkey *k)
176: {
1.123 djm 177: const struct sshkey_impl *impl;
1.1 djm 178:
1.123 djm 179: if ((impl = sshkey_impl_from_type(k->type)) == NULL)
180: return "unknown";
181: return impl->shortname;
1.1 djm 182: }
183:
184: static const char *
185: sshkey_ssh_name_from_type_nid(int type, int nid)
186: {
1.123 djm 187: const struct sshkey_impl *impl;
1.1 djm 188:
1.123 djm 189: if ((impl = sshkey_impl_from_type_nid(type, nid)) == NULL)
190: return "ssh-unknown";
191: return impl->name;
1.1 djm 192: }
193:
194: int
195: sshkey_type_is_cert(int type)
196: {
1.123 djm 197: const struct sshkey_impl *impl;
1.1 djm 198:
1.123 djm 199: if ((impl = sshkey_impl_from_type(type)) == NULL)
200: return 0;
201: return impl->cert;
1.1 djm 202: }
203:
204: const char *
205: sshkey_ssh_name(const struct sshkey *k)
206: {
207: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
208: }
209:
210: const char *
211: sshkey_ssh_name_plain(const struct sshkey *k)
212: {
213: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
214: k->ecdsa_nid);
215: }
216:
217: int
218: sshkey_type_from_name(const char *name)
219: {
1.123 djm 220: int i;
221: const struct sshkey_impl *impl;
1.1 djm 222:
1.123 djm 223: for (i = 0; keyimpls[i] != NULL; i++) {
224: impl = keyimpls[i];
1.1 djm 225: /* Only allow shortname matches for plain key types */
1.123 djm 226: if ((impl->name != NULL && strcmp(name, impl->name) == 0) ||
227: (!impl->cert && strcasecmp(impl->shortname, name) == 0))
228: return impl->type;
1.1 djm 229: }
230: return KEY_UNSPEC;
231: }
232:
1.85 djm 233: static int
234: key_type_is_ecdsa_variant(int type)
235: {
236: switch (type) {
237: case KEY_ECDSA:
238: case KEY_ECDSA_CERT:
239: case KEY_ECDSA_SK:
240: case KEY_ECDSA_SK_CERT:
241: return 1;
242: }
243: return 0;
244: }
245:
1.1 djm 246: int
247: sshkey_ecdsa_nid_from_name(const char *name)
248: {
1.123 djm 249: int i;
1.1 djm 250:
1.123 djm 251: for (i = 0; keyimpls[i] != NULL; i++) {
252: if (!key_type_is_ecdsa_variant(keyimpls[i]->type))
1.4 djm 253: continue;
1.123 djm 254: if (keyimpls[i]->name != NULL &&
255: strcmp(name, keyimpls[i]->name) == 0)
256: return keyimpls[i]->nid;
1.4 djm 257: }
1.1 djm 258: return -1;
1.120 djm 259: }
260:
261: int
262: sshkey_match_keyname_to_sigalgs(const char *keyname, const char *sigalgs)
263: {
264: int ktype;
265:
266: if (sigalgs == NULL || *sigalgs == '\0' ||
267: (ktype = sshkey_type_from_name(keyname)) == KEY_UNSPEC)
268: return 0;
269: else if (ktype == KEY_RSA) {
270: return match_pattern_list("ssh-rsa", sigalgs, 0) == 1 ||
271: match_pattern_list("rsa-sha2-256", sigalgs, 0) == 1 ||
272: match_pattern_list("rsa-sha2-512", sigalgs, 0) == 1;
273: } else if (ktype == KEY_RSA_CERT) {
274: return match_pattern_list("ssh-rsa-cert-v01@openssh.com",
275: sigalgs, 0) == 1 ||
276: match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
277: sigalgs, 0) == 1 ||
278: match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
279: sigalgs, 0) == 1;
280: } else
281: return match_pattern_list(keyname, sigalgs, 0) == 1;
1.1 djm 282: }
283:
284: char *
1.45 djm 285: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 286: {
287: char *tmp, *ret = NULL;
1.123 djm 288: size_t i, nlen, rlen = 0;
289: const struct sshkey_impl *impl;
1.1 djm 290:
1.123 djm 291: for (i = 0; keyimpls[i] != NULL; i++) {
292: impl = keyimpls[i];
293: if (impl->name == NULL)
1.45 djm 294: continue;
1.123 djm 295: if (!include_sigonly && impl->sigonly)
1.1 djm 296: continue;
1.123 djm 297: if ((certs_only && !impl->cert) || (plain_only && impl->cert))
1.1 djm 298: continue;
299: if (ret != NULL)
1.38 djm 300: ret[rlen++] = sep;
1.123 djm 301: nlen = strlen(impl->name);
1.1 djm 302: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
303: free(ret);
304: return NULL;
305: }
306: ret = tmp;
1.123 djm 307: memcpy(ret + rlen, impl->name, nlen + 1);
1.1 djm 308: rlen += nlen;
309: }
310: return ret;
311: }
312:
313: int
1.11 djm 314: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 315: {
316: char *s, *cp, *p;
1.123 djm 317: const struct sshkey_impl *impl;
318: int i, type;
1.1 djm 319:
320: if (names == NULL || strcmp(names, "") == 0)
321: return 0;
322: if ((s = cp = strdup(names)) == NULL)
323: return 0;
324: for ((p = strsep(&cp, ",")); p && *p != '\0';
325: (p = strsep(&cp, ","))) {
1.11 djm 326: type = sshkey_type_from_name(p);
327: if (type == KEY_UNSPEC) {
328: if (allow_wildcard) {
329: /*
330: * Try matching key types against the string.
331: * If any has a positive or negative match then
332: * the component is accepted.
333: */
1.123 djm 334: impl = NULL;
335: for (i = 0; keyimpls[i] != NULL; i++) {
336: if (match_pattern_list(
337: keyimpls[i]->name, p, 0) != 0) {
338: impl = keyimpls[i];
1.11 djm 339: break;
1.123 djm 340: }
1.11 djm 341: }
1.123 djm 342: if (impl != NULL)
1.11 djm 343: continue;
344: }
1.1 djm 345: free(s);
346: return 0;
347: }
348: }
349: free(s);
350: return 1;
351: }
352:
353: u_int
354: sshkey_size(const struct sshkey *k)
355: {
1.123 djm 356: const struct sshkey_impl *impl;
1.69 djm 357:
1.123 djm 358: if ((impl = sshkey_impl_from_type_nid(k->type, k->ecdsa_nid)) == NULL)
359: return 0;
360: if (impl->funcs->size != NULL)
361: return impl->funcs->size(k);
362: return impl->keybits;
1.1 djm 363: }
364:
365: static int
366: sshkey_type_is_valid_ca(int type)
367: {
1.123 djm 368: const struct sshkey_impl *impl;
369:
370: if ((impl = sshkey_impl_from_type(type)) == NULL)
1.1 djm 371: return 0;
1.123 djm 372: /* All non-certificate types may act as CAs */
373: return !impl->cert;
1.1 djm 374: }
375:
376: int
377: sshkey_is_cert(const struct sshkey *k)
378: {
379: if (k == NULL)
380: return 0;
381: return sshkey_type_is_cert(k->type);
382: }
383:
1.90 markus 384: int
385: sshkey_is_sk(const struct sshkey *k)
386: {
387: if (k == NULL)
388: return 0;
389: switch (sshkey_type_plain(k->type)) {
390: case KEY_ECDSA_SK:
391: case KEY_ED25519_SK:
392: return 1;
393: default:
394: return 0;
395: }
396: }
397:
1.1 djm 398: /* Return the cert-less equivalent to a certified key type */
399: int
400: sshkey_type_plain(int type)
401: {
402: switch (type) {
403: case KEY_RSA_CERT:
404: return KEY_RSA;
405: case KEY_DSA_CERT:
406: return KEY_DSA;
407: case KEY_ECDSA_CERT:
408: return KEY_ECDSA;
1.85 djm 409: case KEY_ECDSA_SK_CERT:
410: return KEY_ECDSA_SK;
1.1 djm 411: case KEY_ED25519_CERT:
412: return KEY_ED25519;
1.90 markus 413: case KEY_ED25519_SK_CERT:
414: return KEY_ED25519_SK;
1.62 markus 415: case KEY_XMSS_CERT:
416: return KEY_XMSS;
1.1 djm 417: default:
418: return type;
419: }
420: }
421:
422: #ifdef WITH_OPENSSL
423: /* XXX: these are really begging for a table-driven approach */
424: int
425: sshkey_curve_name_to_nid(const char *name)
426: {
427: if (strcmp(name, "nistp256") == 0)
428: return NID_X9_62_prime256v1;
429: else if (strcmp(name, "nistp384") == 0)
430: return NID_secp384r1;
431: else if (strcmp(name, "nistp521") == 0)
432: return NID_secp521r1;
433: else
434: return -1;
435: }
436:
437: u_int
438: sshkey_curve_nid_to_bits(int nid)
439: {
440: switch (nid) {
441: case NID_X9_62_prime256v1:
442: return 256;
443: case NID_secp384r1:
444: return 384;
445: case NID_secp521r1:
446: return 521;
447: default:
448: return 0;
449: }
450: }
451:
452: int
453: sshkey_ecdsa_bits_to_nid(int bits)
454: {
455: switch (bits) {
456: case 256:
457: return NID_X9_62_prime256v1;
458: case 384:
459: return NID_secp384r1;
460: case 521:
461: return NID_secp521r1;
462: default:
463: return -1;
464: }
465: }
466:
467: const char *
468: sshkey_curve_nid_to_name(int nid)
469: {
470: switch (nid) {
471: case NID_X9_62_prime256v1:
472: return "nistp256";
473: case NID_secp384r1:
474: return "nistp384";
475: case NID_secp521r1:
476: return "nistp521";
477: default:
478: return NULL;
479: }
480: }
481:
482: int
483: sshkey_ec_nid_to_hash_alg(int nid)
484: {
485: int kbits = sshkey_curve_nid_to_bits(nid);
486:
487: if (kbits <= 0)
488: return -1;
489:
490: /* RFC5656 section 6.2.1 */
491: if (kbits <= 256)
492: return SSH_DIGEST_SHA256;
493: else if (kbits <= 384)
494: return SSH_DIGEST_SHA384;
495: else
496: return SSH_DIGEST_SHA512;
497: }
498: #endif /* WITH_OPENSSL */
499:
500: static void
501: cert_free(struct sshkey_cert *cert)
502: {
503: u_int i;
504:
505: if (cert == NULL)
506: return;
1.31 mmcc 507: sshbuf_free(cert->certblob);
508: sshbuf_free(cert->critical);
509: sshbuf_free(cert->extensions);
1.29 mmcc 510: free(cert->key_id);
1.1 djm 511: for (i = 0; i < cert->nprincipals; i++)
512: free(cert->principals[i]);
1.29 mmcc 513: free(cert->principals);
1.30 mmcc 514: sshkey_free(cert->signature_key);
1.67 djm 515: free(cert->signature_type);
1.61 jsing 516: freezero(cert, sizeof(*cert));
1.1 djm 517: }
518:
519: static struct sshkey_cert *
520: cert_new(void)
521: {
522: struct sshkey_cert *cert;
523:
524: if ((cert = calloc(1, sizeof(*cert))) == NULL)
525: return NULL;
526: if ((cert->certblob = sshbuf_new()) == NULL ||
527: (cert->critical = sshbuf_new()) == NULL ||
528: (cert->extensions = sshbuf_new()) == NULL) {
529: cert_free(cert);
530: return NULL;
531: }
532: cert->key_id = NULL;
533: cert->principals = NULL;
534: cert->signature_key = NULL;
1.67 djm 535: cert->signature_type = NULL;
1.1 djm 536: return cert;
537: }
538:
539: struct sshkey *
540: sshkey_new(int type)
541: {
542: struct sshkey *k;
1.123 djm 543: const struct sshkey_impl *impl = NULL;
544:
545: if (type != KEY_UNSPEC &&
546: (impl = sshkey_impl_from_type(type)) == NULL)
547: return NULL;
1.1 djm 548:
1.123 djm 549: /* All non-certificate types may act as CAs */
1.1 djm 550: if ((k = calloc(1, sizeof(*k))) == NULL)
551: return NULL;
552: k->type = type;
553: k->ecdsa_nid = -1;
1.123 djm 554: if (impl != NULL && impl->funcs->alloc != NULL) {
555: if (impl->funcs->alloc(k) != 0) {
1.1 djm 556: free(k);
557: return NULL;
558: }
559: }
560: if (sshkey_is_cert(k)) {
561: if ((k->cert = cert_new()) == NULL) {
562: sshkey_free(k);
563: return NULL;
564: }
565: }
566:
567: return k;
568: }
569:
1.124 ! djm 570: /* Frees common FIDO fields */
! 571: void
! 572: sshkey_sk_cleanup(struct sshkey *k)
! 573: {
! 574: free(k->sk_application);
! 575: sshbuf_free(k->sk_key_handle);
! 576: sshbuf_free(k->sk_reserved);
! 577: k->sk_application = NULL;
! 578: k->sk_key_handle = k->sk_reserved = NULL;
! 579: }
! 580:
1.1 djm 581: void
582: sshkey_free(struct sshkey *k)
583: {
1.123 djm 584: const struct sshkey_impl *impl;
585:
1.1 djm 586: if (k == NULL)
587: return;
1.123 djm 588: if ((impl = sshkey_impl_from_type(k->type)) != NULL &&
589: impl->funcs->cleanup != NULL)
590: impl->funcs->cleanup(k);
1.1 djm 591: if (sshkey_is_cert(k))
592: cert_free(k->cert);
1.76 djm 593: freezero(k->shielded_private, k->shielded_len);
594: freezero(k->shield_prekey, k->shield_prekey_len);
1.61 jsing 595: freezero(k, sizeof(*k));
1.1 djm 596: }
597:
598: static int
599: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
600: {
601: if (a == NULL && b == NULL)
602: return 1;
603: if (a == NULL || b == NULL)
604: return 0;
605: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
606: return 0;
607: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
608: sshbuf_len(a->certblob)) != 0)
609: return 0;
610: return 1;
611: }
612:
1.124 ! djm 613: /* Compares FIDO-specific pubkey fields only */
! 614: int
! 615: sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b)
! 616: {
! 617: if (a->sk_application == NULL || b->sk_application == NULL)
! 618: return 0;
! 619: if (strcmp(a->sk_application, b->sk_application) != 0)
! 620: return 0;
! 621: return 1;
! 622: }
! 623:
1.1 djm 624: /*
625: * Compare public portions of key only, allowing comparisons between
626: * certificates and plain keys too.
627: */
628: int
629: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
630: {
1.124 ! djm 631: const struct sshkey_impl *impl;
1.1 djm 632:
633: if (a == NULL || b == NULL ||
634: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
635: return 0;
1.124 ! djm 636: if ((impl = sshkey_impl_from_type(a->type)) == NULL)
1.1 djm 637: return 0;
1.124 ! djm 638: return impl->funcs->equal(a, b);
1.1 djm 639: }
640:
641: int
642: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
643: {
644: if (a == NULL || b == NULL || a->type != b->type)
645: return 0;
646: if (sshkey_is_cert(a)) {
647: if (!cert_compare(a->cert, b->cert))
648: return 0;
649: }
650: return sshkey_equal_public(a, b);
651: }
652:
653: static int
1.62 markus 654: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
655: enum sshkey_serialize_rep opts)
1.1 djm 656: {
657: int type, ret = SSH_ERR_INTERNAL_ERROR;
658: const char *typename;
1.69 djm 659: #ifdef WITH_OPENSSL
660: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
661: #endif /* WITH_OPENSSL */
1.1 djm 662:
663: if (key == NULL)
664: return SSH_ERR_INVALID_ARGUMENT;
665:
1.19 djm 666: if (sshkey_is_cert(key)) {
667: if (key->cert == NULL)
668: return SSH_ERR_EXPECTED_CERT;
669: if (sshbuf_len(key->cert->certblob) == 0)
670: return SSH_ERR_KEY_LACKS_CERTBLOB;
671: }
1.1 djm 672: type = force_plain ? sshkey_type_plain(key->type) : key->type;
673: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
674:
675: switch (type) {
676: #ifdef WITH_OPENSSL
677: case KEY_DSA_CERT:
678: case KEY_ECDSA_CERT:
1.85 djm 679: case KEY_ECDSA_SK_CERT:
1.1 djm 680: case KEY_RSA_CERT:
681: #endif /* WITH_OPENSSL */
682: case KEY_ED25519_CERT:
1.95 djm 683: case KEY_ED25519_SK_CERT:
1.62 markus 684: #ifdef WITH_XMSS
685: case KEY_XMSS_CERT:
686: #endif /* WITH_XMSS */
1.1 djm 687: /* Use the existing blob */
688: /* XXX modified flag? */
689: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
690: return ret;
691: break;
692: #ifdef WITH_OPENSSL
693: case KEY_DSA:
694: if (key->dsa == NULL)
695: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 696: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
697: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 698: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 699: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
700: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
701: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
702: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 703: return ret;
704: break;
705: case KEY_ECDSA:
1.85 djm 706: case KEY_ECDSA_SK:
1.1 djm 707: if (key->ecdsa == NULL)
708: return SSH_ERR_INVALID_ARGUMENT;
709: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
710: (ret = sshbuf_put_cstring(b,
711: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
712: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
713: return ret;
1.85 djm 714: if (type == KEY_ECDSA_SK) {
715: if ((ret = sshbuf_put_cstring(b,
716: key->sk_application)) != 0)
717: return ret;
718: }
1.1 djm 719: break;
720: case KEY_RSA:
721: if (key->rsa == NULL)
722: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 723: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 724: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 725: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
726: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 727: return ret;
728: break;
729: #endif /* WITH_OPENSSL */
730: case KEY_ED25519:
1.90 markus 731: case KEY_ED25519_SK:
1.1 djm 732: if (key->ed25519_pk == NULL)
733: return SSH_ERR_INVALID_ARGUMENT;
734: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
735: (ret = sshbuf_put_string(b,
736: key->ed25519_pk, ED25519_PK_SZ)) != 0)
737: return ret;
1.90 markus 738: if (type == KEY_ED25519_SK) {
739: if ((ret = sshbuf_put_cstring(b,
740: key->sk_application)) != 0)
741: return ret;
742: }
1.1 djm 743: break;
1.62 markus 744: #ifdef WITH_XMSS
745: case KEY_XMSS:
746: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
747: sshkey_xmss_pklen(key) == 0)
748: return SSH_ERR_INVALID_ARGUMENT;
749: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
750: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
751: (ret = sshbuf_put_string(b,
752: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
753: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
754: return ret;
755: break;
756: #endif /* WITH_XMSS */
1.1 djm 757: default:
758: return SSH_ERR_KEY_TYPE_UNKNOWN;
759: }
760: return 0;
761: }
762:
763: int
1.14 djm 764: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 765: {
1.62 markus 766: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 767: }
768:
769: int
1.62 markus 770: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
771: enum sshkey_serialize_rep opts)
1.14 djm 772: {
773: struct sshbuf *tmp;
774: int r;
775:
776: if ((tmp = sshbuf_new()) == NULL)
777: return SSH_ERR_ALLOC_FAIL;
1.62 markus 778: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 779: if (r == 0)
780: r = sshbuf_put_stringb(b, tmp);
781: sshbuf_free(tmp);
782: return r;
783: }
784:
785: int
1.62 markus 786: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
787: {
788: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
789: }
790:
791: int
1.14 djm 792: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 793: {
1.62 markus 794: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 795: }
796:
797: static int
1.62 markus 798: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
799: enum sshkey_serialize_rep opts)
1.1 djm 800: {
801: int ret = SSH_ERR_INTERNAL_ERROR;
802: size_t len;
803: struct sshbuf *b = NULL;
804:
805: if (lenp != NULL)
806: *lenp = 0;
807: if (blobp != NULL)
808: *blobp = NULL;
809: if ((b = sshbuf_new()) == NULL)
810: return SSH_ERR_ALLOC_FAIL;
1.62 markus 811: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 812: goto out;
813: len = sshbuf_len(b);
814: if (lenp != NULL)
815: *lenp = len;
816: if (blobp != NULL) {
817: if ((*blobp = malloc(len)) == NULL) {
818: ret = SSH_ERR_ALLOC_FAIL;
819: goto out;
820: }
821: memcpy(*blobp, sshbuf_ptr(b), len);
822: }
823: ret = 0;
824: out:
825: sshbuf_free(b);
826: return ret;
827: }
828:
829: int
830: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
831: {
1.62 markus 832: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 833: }
834:
835: int
836: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
837: {
1.62 markus 838: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 839: }
840:
841: int
1.7 djm 842: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 843: u_char **retp, size_t *lenp)
844: {
845: u_char *blob = NULL, *ret = NULL;
846: size_t blob_len = 0;
1.7 djm 847: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 848:
849: if (retp != NULL)
850: *retp = NULL;
851: if (lenp != NULL)
852: *lenp = 0;
1.7 djm 853: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 854: r = SSH_ERR_INVALID_ARGUMENT;
855: goto out;
856: }
1.62 markus 857: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
858: != 0)
1.1 djm 859: goto out;
860: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
861: r = SSH_ERR_ALLOC_FAIL;
862: goto out;
863: }
1.7 djm 864: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 865: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
866: goto out;
867: /* success */
868: if (retp != NULL) {
869: *retp = ret;
870: ret = NULL;
871: }
872: if (lenp != NULL)
1.7 djm 873: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 874: r = 0;
875: out:
876: free(ret);
1.100 jsg 877: if (blob != NULL)
878: freezero(blob, blob_len);
1.1 djm 879: return r;
880: }
881:
882: static char *
1.7 djm 883: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
884: {
885: char *ret;
886: size_t plen = strlen(alg) + 1;
887: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
888:
889: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
890: return NULL;
891: strlcpy(ret, alg, rlen);
892: strlcat(ret, ":", rlen);
893: if (dgst_raw_len == 0)
894: return ret;
1.79 dtucker 895: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 896: freezero(ret, rlen);
1.7 djm 897: return NULL;
898: }
899: /* Trim padding characters from end */
900: ret[strcspn(ret, "=")] = '\0';
901: return ret;
902: }
903:
904: static char *
905: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 906: {
1.7 djm 907: char *retval, hex[5];
908: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 909:
1.7 djm 910: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 911: return NULL;
1.7 djm 912: strlcpy(retval, alg, rlen);
913: strlcat(retval, ":", rlen);
1.1 djm 914: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 915: snprintf(hex, sizeof(hex), "%s%02x",
916: i > 0 ? ":" : "", dgst_raw[i]);
917: strlcat(retval, hex, rlen);
1.1 djm 918: }
919: return retval;
920: }
921:
922: static char *
923: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
924: {
925: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
926: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
927: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
928: u_int i, j = 0, rounds, seed = 1;
929: char *retval;
930:
931: rounds = (dgst_raw_len / 2) + 1;
932: if ((retval = calloc(rounds, 6)) == NULL)
933: return NULL;
934: retval[j++] = 'x';
935: for (i = 0; i < rounds; i++) {
936: u_int idx0, idx1, idx2, idx3, idx4;
937: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
938: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
939: seed) % 6;
940: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
941: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
942: (seed / 6)) % 6;
943: retval[j++] = vowels[idx0];
944: retval[j++] = consonants[idx1];
945: retval[j++] = vowels[idx2];
946: if ((i + 1) < rounds) {
947: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
948: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
949: retval[j++] = consonants[idx3];
950: retval[j++] = '-';
951: retval[j++] = consonants[idx4];
952: seed = ((seed * 5) +
953: ((((u_int)(dgst_raw[2 * i])) * 7) +
954: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
955: }
956: } else {
957: idx0 = seed % 6;
958: idx1 = 16;
959: idx2 = seed / 6;
960: retval[j++] = vowels[idx0];
961: retval[j++] = consonants[idx1];
962: retval[j++] = vowels[idx2];
963: }
964: }
965: retval[j++] = 'x';
966: retval[j++] = '\0';
967: return retval;
968: }
969:
970: /*
971: * Draw an ASCII-Art representing the fingerprint so human brain can
972: * profit from its built-in pattern recognition ability.
973: * This technique is called "random art" and can be found in some
974: * scientific publications like this original paper:
975: *
976: * "Hash Visualization: a New Technique to improve Real-World Security",
977: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
978: * Techniques and E-Commerce (CrypTEC '99)
979: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
980: *
981: * The subject came up in a talk by Dan Kaminsky, too.
982: *
983: * If you see the picture is different, the key is different.
984: * If the picture looks the same, you still know nothing.
985: *
986: * The algorithm used here is a worm crawling over a discrete plane,
987: * leaving a trace (augmenting the field) everywhere it goes.
988: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
989: * makes the respective movement vector be ignored for this turn.
990: * Graphs are not unambiguous, because circles in graphs can be
991: * walked in either direction.
992: */
993:
994: /*
995: * Field sizes for the random art. Have to be odd, so the starting point
996: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
997: * Else pictures would be too dense, and drawing the frame would
998: * fail, too, because the key type would not fit in anymore.
999: */
1000: #define FLDBASE 8
1001: #define FLDSIZE_Y (FLDBASE + 1)
1002: #define FLDSIZE_X (FLDBASE * 2 + 1)
1003: static char *
1.7 djm 1004: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1005: const struct sshkey *k)
1006: {
1007: /*
1008: * Chars to be used after each other every time the worm
1009: * intersects with itself. Matter of taste.
1010: */
1011: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1012: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1013: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1014: size_t i, tlen, hlen;
1.1 djm 1015: u_int b;
1.3 djm 1016: int x, y, r;
1.1 djm 1017: size_t len = strlen(augmentation_string) - 1;
1018:
1019: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1020: return NULL;
1021:
1022: /* initialize field */
1023: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1024: x = FLDSIZE_X / 2;
1025: y = FLDSIZE_Y / 2;
1026:
1027: /* process raw key */
1028: for (i = 0; i < dgst_raw_len; i++) {
1029: int input;
1030: /* each byte conveys four 2-bit move commands */
1031: input = dgst_raw[i];
1032: for (b = 0; b < 4; b++) {
1033: /* evaluate 2 bit, rest is shifted later */
1034: x += (input & 0x1) ? 1 : -1;
1035: y += (input & 0x2) ? 1 : -1;
1036:
1037: /* assure we are still in bounds */
1.37 deraadt 1038: x = MAXIMUM(x, 0);
1039: y = MAXIMUM(y, 0);
1040: x = MINIMUM(x, FLDSIZE_X - 1);
1041: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1042:
1043: /* augment the field */
1044: if (field[x][y] < len - 2)
1045: field[x][y]++;
1046: input = input >> 2;
1047: }
1048: }
1049:
1050: /* mark starting point and end point*/
1051: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1052: field[x][y] = len;
1053:
1.3 djm 1054: /* assemble title */
1055: r = snprintf(title, sizeof(title), "[%s %u]",
1056: sshkey_type(k), sshkey_size(k));
1057: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1058: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1059: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1060: tlen = (r <= 0) ? 0 : strlen(title);
1061:
1062: /* assemble hash ID. */
1063: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1064: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1065:
1066: /* output upper border */
1.3 djm 1067: p = retval;
1068: *p++ = '+';
1069: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1070: *p++ = '-';
1071: memcpy(p, title, tlen);
1072: p += tlen;
1.7 djm 1073: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1074: *p++ = '-';
1075: *p++ = '+';
1076: *p++ = '\n';
1077:
1078: /* output content */
1079: for (y = 0; y < FLDSIZE_Y; y++) {
1080: *p++ = '|';
1081: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1082: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1083: *p++ = '|';
1084: *p++ = '\n';
1085: }
1086:
1087: /* output lower border */
1088: *p++ = '+';
1.7 djm 1089: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1090: *p++ = '-';
1091: memcpy(p, hash, hlen);
1092: p += hlen;
1093: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1094: *p++ = '-';
1095: *p++ = '+';
1096:
1097: return retval;
1098: }
1099:
1100: char *
1.7 djm 1101: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1102: enum sshkey_fp_rep dgst_rep)
1103: {
1104: char *retval = NULL;
1105: u_char *dgst_raw;
1106: size_t dgst_raw_len;
1107:
1.7 djm 1108: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1109: return NULL;
1110: switch (dgst_rep) {
1.7 djm 1111: case SSH_FP_DEFAULT:
1112: if (dgst_alg == SSH_DIGEST_MD5) {
1113: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1114: dgst_raw, dgst_raw_len);
1115: } else {
1116: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1117: dgst_raw, dgst_raw_len);
1118: }
1119: break;
1.1 djm 1120: case SSH_FP_HEX:
1.7 djm 1121: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1122: dgst_raw, dgst_raw_len);
1123: break;
1124: case SSH_FP_BASE64:
1125: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1126: dgst_raw, dgst_raw_len);
1.1 djm 1127: break;
1128: case SSH_FP_BUBBLEBABBLE:
1129: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1130: break;
1131: case SSH_FP_RANDOMART:
1.7 djm 1132: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1133: dgst_raw, dgst_raw_len, k);
1.1 djm 1134: break;
1135: default:
1.100 jsg 1136: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1137: return NULL;
1138: }
1.100 jsg 1139: freezero(dgst_raw, dgst_raw_len);
1.1 djm 1140: return retval;
1141: }
1142:
1.63 djm 1143: static int
1144: peek_type_nid(const char *s, size_t l, int *nid)
1145: {
1.123 djm 1146: const struct sshkey_impl *impl;
1147: int i;
1.63 djm 1148:
1.123 djm 1149: for (i = 0; keyimpls[i] != NULL; i++) {
1150: impl = keyimpls[i];
1151: if (impl->name == NULL || strlen(impl->name) != l)
1.63 djm 1152: continue;
1.123 djm 1153: if (memcmp(s, impl->name, l) == 0) {
1.63 djm 1154: *nid = -1;
1.123 djm 1155: if (key_type_is_ecdsa_variant(impl->type))
1156: *nid = impl->nid;
1157: return impl->type;
1.63 djm 1158: }
1159: }
1160: return KEY_UNSPEC;
1161: }
1.1 djm 1162:
1.63 djm 1163: /* XXX this can now be made const char * */
1.1 djm 1164: int
1165: sshkey_read(struct sshkey *ret, char **cpp)
1166: {
1167: struct sshkey *k;
1.63 djm 1168: char *cp, *blobcopy;
1169: size_t space;
1.1 djm 1170: int r, type, curve_nid = -1;
1171: struct sshbuf *blob;
1.44 dtucker 1172:
1173: if (ret == NULL)
1174: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1175:
1176: switch (ret->type) {
1177: case KEY_UNSPEC:
1178: case KEY_RSA:
1179: case KEY_DSA:
1180: case KEY_ECDSA:
1.85 djm 1181: case KEY_ECDSA_SK:
1.1 djm 1182: case KEY_ED25519:
1.90 markus 1183: case KEY_ED25519_SK:
1.1 djm 1184: case KEY_DSA_CERT:
1185: case KEY_ECDSA_CERT:
1.85 djm 1186: case KEY_ECDSA_SK_CERT:
1.1 djm 1187: case KEY_RSA_CERT:
1188: case KEY_ED25519_CERT:
1.90 markus 1189: case KEY_ED25519_SK_CERT:
1.62 markus 1190: #ifdef WITH_XMSS
1191: case KEY_XMSS:
1192: case KEY_XMSS_CERT:
1193: #endif /* WITH_XMSS */
1.63 djm 1194: break; /* ok */
1195: default:
1196: return SSH_ERR_INVALID_ARGUMENT;
1197: }
1198:
1199: /* Decode type */
1200: cp = *cpp;
1201: space = strcspn(cp, " \t");
1202: if (space == strlen(cp))
1203: return SSH_ERR_INVALID_FORMAT;
1204: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1205: return SSH_ERR_INVALID_FORMAT;
1206:
1207: /* skip whitespace */
1208: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1209: ;
1210: if (*cp == '\0')
1211: return SSH_ERR_INVALID_FORMAT;
1212: if (ret->type != KEY_UNSPEC && ret->type != type)
1213: return SSH_ERR_KEY_TYPE_MISMATCH;
1214: if ((blob = sshbuf_new()) == NULL)
1215: return SSH_ERR_ALLOC_FAIL;
1216:
1217: /* find end of keyblob and decode */
1218: space = strcspn(cp, " \t");
1219: if ((blobcopy = strndup(cp, space)) == NULL) {
1220: sshbuf_free(blob);
1221: return SSH_ERR_ALLOC_FAIL;
1222: }
1223: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1224: free(blobcopy);
1225: sshbuf_free(blob);
1226: return r;
1227: }
1228: free(blobcopy);
1229: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1230: sshbuf_free(blob);
1.63 djm 1231: return r;
1232: }
1233: sshbuf_free(blob);
1234:
1235: /* skip whitespace and leave cp at start of comment */
1236: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1237: ;
1238:
1239: /* ensure type of blob matches type at start of line */
1240: if (k->type != type) {
1241: sshkey_free(k);
1242: return SSH_ERR_KEY_TYPE_MISMATCH;
1243: }
1.85 djm 1244: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1245: sshkey_free(k);
1246: return SSH_ERR_EC_CURVE_MISMATCH;
1247: }
1248:
1249: /* Fill in ret from parsed key */
1250: ret->type = type;
1251: if (sshkey_is_cert(ret)) {
1252: if (!sshkey_is_cert(k)) {
1.1 djm 1253: sshkey_free(k);
1.63 djm 1254: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1255: }
1.63 djm 1256: if (ret->cert != NULL)
1257: cert_free(ret->cert);
1258: ret->cert = k->cert;
1259: k->cert = NULL;
1260: }
1261: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1262: #ifdef WITH_OPENSSL
1.63 djm 1263: case KEY_RSA:
1264: RSA_free(ret->rsa);
1265: ret->rsa = k->rsa;
1266: k->rsa = NULL;
1.1 djm 1267: #ifdef DEBUG_PK
1.63 djm 1268: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1269: #endif
1.63 djm 1270: break;
1271: case KEY_DSA:
1272: DSA_free(ret->dsa);
1273: ret->dsa = k->dsa;
1274: k->dsa = NULL;
1.1 djm 1275: #ifdef DEBUG_PK
1.63 djm 1276: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1277: #endif
1.63 djm 1278: break;
1279: case KEY_ECDSA:
1280: EC_KEY_free(ret->ecdsa);
1281: ret->ecdsa = k->ecdsa;
1282: ret->ecdsa_nid = k->ecdsa_nid;
1283: k->ecdsa = NULL;
1284: k->ecdsa_nid = -1;
1.1 djm 1285: #ifdef DEBUG_PK
1.63 djm 1286: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1287: #endif
1.63 djm 1288: break;
1.85 djm 1289: case KEY_ECDSA_SK:
1290: EC_KEY_free(ret->ecdsa);
1291: ret->ecdsa = k->ecdsa;
1292: ret->ecdsa_nid = k->ecdsa_nid;
1293: ret->sk_application = k->sk_application;
1294: k->ecdsa = NULL;
1295: k->ecdsa_nid = -1;
1296: k->sk_application = NULL;
1297: #ifdef DEBUG_PK
1298: sshkey_dump_ec_key(ret->ecdsa);
1299: fprintf(stderr, "App: %s\n", ret->sk_application);
1300: #endif
1301: break;
1.1 djm 1302: #endif /* WITH_OPENSSL */
1.63 djm 1303: case KEY_ED25519:
1304: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1305: ret->ed25519_pk = k->ed25519_pk;
1306: k->ed25519_pk = NULL;
1.1 djm 1307: #ifdef DEBUG_PK
1.63 djm 1308: /* XXX */
1.1 djm 1309: #endif
1.63 djm 1310: break;
1.90 markus 1311: case KEY_ED25519_SK:
1312: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1313: ret->ed25519_pk = k->ed25519_pk;
1314: ret->sk_application = k->sk_application;
1315: k->ed25519_pk = NULL;
1316: k->sk_application = NULL;
1317: break;
1.62 markus 1318: #ifdef WITH_XMSS
1.63 djm 1319: case KEY_XMSS:
1320: free(ret->xmss_pk);
1321: ret->xmss_pk = k->xmss_pk;
1322: k->xmss_pk = NULL;
1323: free(ret->xmss_state);
1324: ret->xmss_state = k->xmss_state;
1325: k->xmss_state = NULL;
1326: free(ret->xmss_name);
1327: ret->xmss_name = k->xmss_name;
1328: k->xmss_name = NULL;
1329: free(ret->xmss_filename);
1330: ret->xmss_filename = k->xmss_filename;
1331: k->xmss_filename = NULL;
1.62 markus 1332: #ifdef DEBUG_PK
1.63 djm 1333: /* XXX */
1.62 markus 1334: #endif
1.63 djm 1335: break;
1.62 markus 1336: #endif /* WITH_XMSS */
1.63 djm 1337: default:
1.1 djm 1338: sshkey_free(k);
1.63 djm 1339: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1340: }
1.63 djm 1341: sshkey_free(k);
1342:
1343: /* success */
1344: *cpp = cp;
1345: return 0;
1.1 djm 1346: }
1347:
1348: int
1.19 djm 1349: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1350: {
1.19 djm 1351: int r = SSH_ERR_INTERNAL_ERROR;
1352: struct sshbuf *b = NULL;
1.1 djm 1353: char *uu = NULL;
1.19 djm 1354:
1355: if (b64p != NULL)
1356: *b64p = NULL;
1357: if ((b = sshbuf_new()) == NULL)
1358: return SSH_ERR_ALLOC_FAIL;
1359: if ((r = sshkey_putb(key, b)) != 0)
1360: goto out;
1.81 djm 1361: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1362: r = SSH_ERR_ALLOC_FAIL;
1363: goto out;
1364: }
1365: /* Success */
1366: if (b64p != NULL) {
1367: *b64p = uu;
1368: uu = NULL;
1369: }
1370: r = 0;
1371: out:
1372: sshbuf_free(b);
1373: free(uu);
1374: return r;
1375: }
1376:
1.52 djm 1377: int
1.19 djm 1378: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1379: {
1380: int r = SSH_ERR_INTERNAL_ERROR;
1381: char *uu = NULL;
1382:
1.48 djm 1383: if ((r = sshkey_to_base64(key, &uu)) != 0)
1384: goto out;
1385: if ((r = sshbuf_putf(b, "%s %s",
1386: sshkey_ssh_name(key), uu)) != 0)
1387: goto out;
1.19 djm 1388: r = 0;
1389: out:
1390: free(uu);
1391: return r;
1392: }
1393:
1394: int
1395: sshkey_write(const struct sshkey *key, FILE *f)
1396: {
1397: struct sshbuf *b = NULL;
1398: int r = SSH_ERR_INTERNAL_ERROR;
1399:
1400: if ((b = sshbuf_new()) == NULL)
1401: return SSH_ERR_ALLOC_FAIL;
1402: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1403: goto out;
1404: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1405: if (feof(f))
1406: errno = EPIPE;
1.19 djm 1407: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1408: goto out;
1409: }
1.19 djm 1410: /* Success */
1411: r = 0;
1.1 djm 1412: out:
1.19 djm 1413: sshbuf_free(b);
1414: return r;
1.1 djm 1415: }
1416:
1417: const char *
1418: sshkey_cert_type(const struct sshkey *k)
1419: {
1420: switch (k->cert->type) {
1421: case SSH2_CERT_TYPE_USER:
1422: return "user";
1423: case SSH2_CERT_TYPE_HOST:
1424: return "host";
1425: default:
1426: return "unknown";
1427: }
1428: }
1429:
1430: #ifdef WITH_OPENSSL
1431: static int
1432: rsa_generate_private_key(u_int bits, RSA **rsap)
1433: {
1434: RSA *private = NULL;
1435: BIGNUM *f4 = NULL;
1436: int ret = SSH_ERR_INTERNAL_ERROR;
1437:
1.49 djm 1438: if (rsap == NULL)
1439: return SSH_ERR_INVALID_ARGUMENT;
1440: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1441: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1442: return SSH_ERR_KEY_LENGTH;
1.1 djm 1443: *rsap = NULL;
1444: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1445: ret = SSH_ERR_ALLOC_FAIL;
1446: goto out;
1447: }
1448: if (!BN_set_word(f4, RSA_F4) ||
1449: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1450: ret = SSH_ERR_LIBCRYPTO_ERROR;
1451: goto out;
1452: }
1453: *rsap = private;
1454: private = NULL;
1455: ret = 0;
1456: out:
1.60 jsing 1457: RSA_free(private);
1458: BN_free(f4);
1.1 djm 1459: return ret;
1460: }
1461:
1462: static int
1463: dsa_generate_private_key(u_int bits, DSA **dsap)
1464: {
1465: DSA *private;
1466: int ret = SSH_ERR_INTERNAL_ERROR;
1467:
1.49 djm 1468: if (dsap == NULL)
1.1 djm 1469: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1470: if (bits != 1024)
1471: return SSH_ERR_KEY_LENGTH;
1.1 djm 1472: if ((private = DSA_new()) == NULL) {
1473: ret = SSH_ERR_ALLOC_FAIL;
1474: goto out;
1475: }
1476: *dsap = NULL;
1477: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1478: NULL, NULL) || !DSA_generate_key(private)) {
1479: ret = SSH_ERR_LIBCRYPTO_ERROR;
1480: goto out;
1481: }
1482: *dsap = private;
1483: private = NULL;
1484: ret = 0;
1485: out:
1.60 jsing 1486: DSA_free(private);
1.1 djm 1487: return ret;
1488: }
1489:
1490: int
1491: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1492: {
1493: EC_GROUP *eg;
1494: int nids[] = {
1495: NID_X9_62_prime256v1,
1496: NID_secp384r1,
1497: NID_secp521r1,
1498: -1
1499: };
1500: int nid;
1501: u_int i;
1502: const EC_GROUP *g = EC_KEY_get0_group(k);
1503:
1504: /*
1505: * The group may be stored in a ASN.1 encoded private key in one of two
1506: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1507: * or explicit group parameters encoded into the key blob. Only the
1508: * "named group" case sets the group NID for us, but we can figure
1509: * it out for the other case by comparing against all the groups that
1510: * are supported.
1511: */
1512: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1513: return nid;
1514: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1515: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1516: return -1;
1.93 djm 1517: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1518: break;
1519: EC_GROUP_free(eg);
1520: }
1521: if (nids[i] != -1) {
1522: /* Use the group with the NID attached */
1523: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1524: if (EC_KEY_set_group(k, eg) != 1) {
1525: EC_GROUP_free(eg);
1526: return -1;
1527: }
1528: }
1529: return nids[i];
1530: }
1531:
1532: static int
1533: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1534: {
1535: EC_KEY *private;
1536: int ret = SSH_ERR_INTERNAL_ERROR;
1537:
1.50 djm 1538: if (nid == NULL || ecdsap == NULL)
1.1 djm 1539: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1540: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1541: return SSH_ERR_KEY_LENGTH;
1.1 djm 1542: *ecdsap = NULL;
1543: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1544: ret = SSH_ERR_ALLOC_FAIL;
1545: goto out;
1546: }
1547: if (EC_KEY_generate_key(private) != 1) {
1548: ret = SSH_ERR_LIBCRYPTO_ERROR;
1549: goto out;
1550: }
1551: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1552: *ecdsap = private;
1553: private = NULL;
1554: ret = 0;
1555: out:
1.60 jsing 1556: EC_KEY_free(private);
1.1 djm 1557: return ret;
1558: }
1559: #endif /* WITH_OPENSSL */
1560:
1561: int
1562: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1563: {
1564: struct sshkey *k;
1565: int ret = SSH_ERR_INTERNAL_ERROR;
1566:
1567: if (keyp == NULL)
1568: return SSH_ERR_INVALID_ARGUMENT;
1569: *keyp = NULL;
1570: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1571: return SSH_ERR_ALLOC_FAIL;
1572: switch (type) {
1573: case KEY_ED25519:
1574: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1575: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1576: ret = SSH_ERR_ALLOC_FAIL;
1577: break;
1578: }
1579: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1580: ret = 0;
1581: break;
1.62 markus 1582: #ifdef WITH_XMSS
1583: case KEY_XMSS:
1584: ret = sshkey_xmss_generate_private_key(k, bits);
1585: break;
1586: #endif /* WITH_XMSS */
1.1 djm 1587: #ifdef WITH_OPENSSL
1588: case KEY_DSA:
1589: ret = dsa_generate_private_key(bits, &k->dsa);
1590: break;
1591: case KEY_ECDSA:
1592: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1593: &k->ecdsa);
1594: break;
1595: case KEY_RSA:
1596: ret = rsa_generate_private_key(bits, &k->rsa);
1597: break;
1598: #endif /* WITH_OPENSSL */
1599: default:
1600: ret = SSH_ERR_INVALID_ARGUMENT;
1601: }
1602: if (ret == 0) {
1603: k->type = type;
1604: *keyp = k;
1605: } else
1606: sshkey_free(k);
1607: return ret;
1608: }
1609:
1610: int
1611: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1612: {
1613: u_int i;
1614: const struct sshkey_cert *from;
1615: struct sshkey_cert *to;
1.67 djm 1616: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1617:
1.67 djm 1618: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1619: return SSH_ERR_INVALID_ARGUMENT;
1620:
1.67 djm 1621: if ((to = cert_new()) == NULL)
1.1 djm 1622: return SSH_ERR_ALLOC_FAIL;
1623:
1.67 djm 1624: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1625: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1626: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1627: goto out;
1.1 djm 1628:
1629: to->serial = from->serial;
1630: to->type = from->type;
1631: if (from->key_id == NULL)
1632: to->key_id = NULL;
1.67 djm 1633: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1634: r = SSH_ERR_ALLOC_FAIL;
1635: goto out;
1636: }
1.1 djm 1637: to->valid_after = from->valid_after;
1638: to->valid_before = from->valid_before;
1639: if (from->signature_key == NULL)
1640: to->signature_key = NULL;
1.67 djm 1641: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1642: &to->signature_key)) != 0)
1.67 djm 1643: goto out;
1644: if (from->signature_type != NULL &&
1645: (to->signature_type = strdup(from->signature_type)) == NULL) {
1646: r = SSH_ERR_ALLOC_FAIL;
1647: goto out;
1648: }
1649: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1650: r = SSH_ERR_INVALID_ARGUMENT;
1651: goto out;
1652: }
1.1 djm 1653: if (from->nprincipals > 0) {
1654: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1655: sizeof(*to->principals))) == NULL) {
1656: r = SSH_ERR_ALLOC_FAIL;
1657: goto out;
1658: }
1.1 djm 1659: for (i = 0; i < from->nprincipals; i++) {
1660: to->principals[i] = strdup(from->principals[i]);
1661: if (to->principals[i] == NULL) {
1662: to->nprincipals = i;
1.67 djm 1663: r = SSH_ERR_ALLOC_FAIL;
1664: goto out;
1.1 djm 1665: }
1666: }
1667: }
1668: to->nprincipals = from->nprincipals;
1.67 djm 1669:
1670: /* success */
1671: cert_free(to_key->cert);
1672: to_key->cert = to;
1673: to = NULL;
1674: r = 0;
1675: out:
1676: cert_free(to);
1677: return r;
1.1 djm 1678: }
1679:
1680: int
1681: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1682: {
1683: struct sshkey *n = NULL;
1.69 djm 1684: int r = SSH_ERR_INTERNAL_ERROR;
1685: #ifdef WITH_OPENSSL
1686: const BIGNUM *rsa_n, *rsa_e;
1687: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1688: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1689: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1690: BIGNUM *dsa_pub_key_dup = NULL;
1691: #endif /* WITH_OPENSSL */
1.1 djm 1692:
1.24 djm 1693: *pkp = NULL;
1.85 djm 1694: if ((n = sshkey_new(k->type)) == NULL) {
1695: r = SSH_ERR_ALLOC_FAIL;
1696: goto out;
1697: }
1.1 djm 1698: switch (k->type) {
1699: #ifdef WITH_OPENSSL
1700: case KEY_DSA:
1701: case KEY_DSA_CERT:
1.69 djm 1702: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1703: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1704: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1705: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1706: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1707: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1708: r = SSH_ERR_ALLOC_FAIL;
1709: goto out;
1710: }
1711: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1712: r = SSH_ERR_LIBCRYPTO_ERROR;
1713: goto out;
1.1 djm 1714: }
1.69 djm 1715: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1716: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1717: r = SSH_ERR_LIBCRYPTO_ERROR;
1718: goto out;
1719: }
1720: dsa_pub_key_dup = NULL; /* transferred */
1721:
1.1 djm 1722: break;
1723: case KEY_ECDSA:
1724: case KEY_ECDSA_CERT:
1.85 djm 1725: case KEY_ECDSA_SK:
1726: case KEY_ECDSA_SK_CERT:
1.1 djm 1727: n->ecdsa_nid = k->ecdsa_nid;
1728: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1729: if (n->ecdsa == NULL) {
1.69 djm 1730: r = SSH_ERR_ALLOC_FAIL;
1731: goto out;
1.1 djm 1732: }
1733: if (EC_KEY_set_public_key(n->ecdsa,
1734: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1735: r = SSH_ERR_LIBCRYPTO_ERROR;
1736: goto out;
1.1 djm 1737: }
1.85 djm 1738: if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT)
1739: break;
1740: /* Append security-key application string */
1741: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1742: goto out;
1.1 djm 1743: break;
1744: case KEY_RSA:
1745: case KEY_RSA_CERT:
1.69 djm 1746: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1747: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1748: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1749: r = SSH_ERR_ALLOC_FAIL;
1750: goto out;
1751: }
1752: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1753: r = SSH_ERR_LIBCRYPTO_ERROR;
1754: goto out;
1755: }
1756: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1757: break;
1758: #endif /* WITH_OPENSSL */
1759: case KEY_ED25519:
1760: case KEY_ED25519_CERT:
1.90 markus 1761: case KEY_ED25519_SK:
1762: case KEY_ED25519_SK_CERT:
1.1 djm 1763: if (k->ed25519_pk != NULL) {
1764: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1765: r = SSH_ERR_ALLOC_FAIL;
1766: goto out;
1.1 djm 1767: }
1768: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1769: }
1.90 markus 1770: if (k->type != KEY_ED25519_SK &&
1771: k->type != KEY_ED25519_SK_CERT)
1772: break;
1773: /* Append security-key application string */
1774: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1775: goto out;
1.1 djm 1776: break;
1.62 markus 1777: #ifdef WITH_XMSS
1778: case KEY_XMSS:
1779: case KEY_XMSS_CERT:
1.69 djm 1780: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1781: goto out;
1.62 markus 1782: if (k->xmss_pk != NULL) {
1.92 markus 1783: u_int32_t left;
1.62 markus 1784: size_t pklen = sshkey_xmss_pklen(k);
1785: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1786: r = SSH_ERR_INTERNAL_ERROR;
1787: goto out;
1.62 markus 1788: }
1789: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1790: r = SSH_ERR_ALLOC_FAIL;
1791: goto out;
1.62 markus 1792: }
1793: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1.92 markus 1794: /* simulate number of signatures left on pubkey */
1795: left = sshkey_xmss_signatures_left(k);
1796: if (left)
1797: sshkey_xmss_enable_maxsign(n, left);
1.62 markus 1798: }
1799: break;
1800: #endif /* WITH_XMSS */
1.1 djm 1801: default:
1.69 djm 1802: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1803: goto out;
1.1 djm 1804: }
1.69 djm 1805: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1806: goto out;
1807: /* success */
1.1 djm 1808: *pkp = n;
1.69 djm 1809: n = NULL;
1810: r = 0;
1811: out:
1812: sshkey_free(n);
1.83 djm 1813: #ifdef WITH_OPENSSL
1.69 djm 1814: BN_clear_free(rsa_n_dup);
1815: BN_clear_free(rsa_e_dup);
1816: BN_clear_free(dsa_p_dup);
1817: BN_clear_free(dsa_q_dup);
1818: BN_clear_free(dsa_g_dup);
1819: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1820: #endif /* WITH_OPENSSL */
1.69 djm 1821:
1822: return r;
1.1 djm 1823: }
1824:
1.76 djm 1825: int
1826: sshkey_is_shielded(struct sshkey *k)
1827: {
1828: return k != NULL && k->shielded_private != NULL;
1829: }
1830:
1831: int
1832: sshkey_shield_private(struct sshkey *k)
1833: {
1834: struct sshbuf *prvbuf = NULL;
1835: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1836: struct sshcipher_ctx *cctx = NULL;
1837: const struct sshcipher *cipher;
1838: size_t i, enclen = 0;
1839: struct sshkey *kswap = NULL, tmp;
1840: int r = SSH_ERR_INTERNAL_ERROR;
1841:
1842: #ifdef DEBUG_PK
1843: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1844: #endif
1845: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1846: r = SSH_ERR_INVALID_ARGUMENT;
1847: goto out;
1848: }
1849: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1850: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1851: r = SSH_ERR_INTERNAL_ERROR;
1852: goto out;
1853: }
1854:
1855: /* Prepare a random pre-key, and from it an ephemeral key */
1856: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1857: r = SSH_ERR_ALLOC_FAIL;
1858: goto out;
1859: }
1860: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1861: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1862: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1863: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1864: goto out;
1865: #ifdef DEBUG_PK
1866: fprintf(stderr, "%s: key+iv\n", __func__);
1867: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1868: stderr);
1869: #endif
1870: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1871: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1872: goto out;
1873:
1874: /* Serialise and encrypt the private key using the ephemeral key */
1875: if ((prvbuf = sshbuf_new()) == NULL) {
1876: r = SSH_ERR_ALLOC_FAIL;
1877: goto out;
1878: }
1879: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1880: goto out;
1881: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.116 djm 1882: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 1883: goto out;
1884: /* pad to cipher blocksize */
1885: i = 0;
1886: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1887: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1888: goto out;
1889: }
1890: #ifdef DEBUG_PK
1891: fprintf(stderr, "%s: serialised\n", __func__);
1892: sshbuf_dump(prvbuf, stderr);
1893: #endif
1894: /* encrypt */
1895: enclen = sshbuf_len(prvbuf);
1896: if ((enc = malloc(enclen)) == NULL) {
1897: r = SSH_ERR_ALLOC_FAIL;
1898: goto out;
1899: }
1900: if ((r = cipher_crypt(cctx, 0, enc,
1901: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1902: goto out;
1903: #ifdef DEBUG_PK
1904: fprintf(stderr, "%s: encrypted\n", __func__);
1905: sshbuf_dump_data(enc, enclen, stderr);
1906: #endif
1907:
1908: /* Make a scrubbed, public-only copy of our private key argument */
1909: if ((r = sshkey_from_private(k, &kswap)) != 0)
1910: goto out;
1911:
1912: /* Swap the private key out (it will be destroyed below) */
1913: tmp = *kswap;
1914: *kswap = *k;
1915: *k = tmp;
1916:
1917: /* Insert the shielded key into our argument */
1918: k->shielded_private = enc;
1919: k->shielded_len = enclen;
1920: k->shield_prekey = prekey;
1921: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1922: enc = prekey = NULL; /* transferred */
1923: enclen = 0;
1.99 djm 1924:
1925: /* preserve key fields that are required for correct operation */
1926: k->sk_flags = kswap->sk_flags;
1.76 djm 1927:
1928: /* success */
1929: r = 0;
1930:
1931: out:
1932: /* XXX behaviour on error - invalidate original private key? */
1933: cipher_free(cctx);
1934: explicit_bzero(keyiv, sizeof(keyiv));
1935: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1936: freezero(enc, enclen);
1.76 djm 1937: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1938: sshkey_free(kswap);
1939: sshbuf_free(prvbuf);
1940: return r;
1941: }
1942:
1.121 djm 1943: /* Check deterministic padding after private key */
1944: static int
1945: private2_check_padding(struct sshbuf *decrypted)
1946: {
1947: u_char pad;
1948: size_t i;
1949: int r;
1950:
1951: i = 0;
1952: while (sshbuf_len(decrypted)) {
1953: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1954: goto out;
1955: if (pad != (++i & 0xff)) {
1956: r = SSH_ERR_INVALID_FORMAT;
1957: goto out;
1958: }
1959: }
1960: /* success */
1961: r = 0;
1962: out:
1963: explicit_bzero(&pad, sizeof(pad));
1964: explicit_bzero(&i, sizeof(i));
1965: return r;
1966: }
1967:
1.76 djm 1968: int
1969: sshkey_unshield_private(struct sshkey *k)
1970: {
1971: struct sshbuf *prvbuf = NULL;
1.121 djm 1972: u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1.76 djm 1973: struct sshcipher_ctx *cctx = NULL;
1974: const struct sshcipher *cipher;
1975: struct sshkey *kswap = NULL, tmp;
1976: int r = SSH_ERR_INTERNAL_ERROR;
1977:
1978: #ifdef DEBUG_PK
1979: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1980: #endif
1981: if (!sshkey_is_shielded(k))
1982: return 0; /* nothing to do */
1983:
1984: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1985: r = SSH_ERR_INVALID_ARGUMENT;
1986: goto out;
1987: }
1988: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1989: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1990: r = SSH_ERR_INTERNAL_ERROR;
1991: goto out;
1992: }
1993: /* check size of shielded key blob */
1994: if (k->shielded_len < cipher_blocksize(cipher) ||
1995: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1996: r = SSH_ERR_INVALID_FORMAT;
1997: goto out;
1998: }
1999:
2000: /* Calculate the ephemeral key from the prekey */
2001: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2002: k->shield_prekey, k->shield_prekey_len,
2003: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2004: goto out;
2005: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2006: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2007: goto out;
2008: #ifdef DEBUG_PK
2009: fprintf(stderr, "%s: key+iv\n", __func__);
2010: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2011: stderr);
2012: #endif
2013:
2014: /* Decrypt and parse the shielded private key using the ephemeral key */
2015: if ((prvbuf = sshbuf_new()) == NULL) {
2016: r = SSH_ERR_ALLOC_FAIL;
2017: goto out;
2018: }
2019: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2020: goto out;
2021: /* decrypt */
2022: #ifdef DEBUG_PK
2023: fprintf(stderr, "%s: encrypted\n", __func__);
2024: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2025: #endif
2026: if ((r = cipher_crypt(cctx, 0, cp,
2027: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2028: goto out;
2029: #ifdef DEBUG_PK
2030: fprintf(stderr, "%s: serialised\n", __func__);
2031: sshbuf_dump(prvbuf, stderr);
2032: #endif
2033: /* Parse private key */
2034: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2035: goto out;
1.121 djm 2036:
2037: if ((r = private2_check_padding(prvbuf)) != 0)
2038: goto out;
1.76 djm 2039:
2040: /* Swap the parsed key back into place */
2041: tmp = *kswap;
2042: *kswap = *k;
2043: *k = tmp;
2044:
2045: /* success */
2046: r = 0;
2047:
2048: out:
2049: cipher_free(cctx);
2050: explicit_bzero(keyiv, sizeof(keyiv));
2051: explicit_bzero(&tmp, sizeof(tmp));
2052: sshkey_free(kswap);
2053: sshbuf_free(prvbuf);
2054: return r;
2055: }
2056:
1.1 djm 2057: static int
1.14 djm 2058: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2059: {
1.14 djm 2060: struct sshbuf *principals = NULL, *crit = NULL;
2061: struct sshbuf *exts = NULL, *ca = NULL;
2062: u_char *sig = NULL;
2063: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2064: int ret = SSH_ERR_INTERNAL_ERROR;
2065:
2066: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2067: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2068: return ret;
2069:
1.20 djm 2070: /* Parse body of certificate up to signature */
2071: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2072: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2073: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2074: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2075: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2076: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2077: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2078: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2079: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2080: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2081: /* XXX debug print error for ret */
2082: ret = SSH_ERR_INVALID_FORMAT;
2083: goto out;
2084: }
2085:
2086: /* Signature is left in the buffer so we can calculate this length */
2087: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2088:
2089: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2090: ret = SSH_ERR_INVALID_FORMAT;
2091: goto out;
2092: }
2093:
2094: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2095: key->cert->type != SSH2_CERT_TYPE_HOST) {
2096: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2097: goto out;
2098: }
2099:
1.4 djm 2100: /* Parse principals section */
2101: while (sshbuf_len(principals) > 0) {
2102: char *principal = NULL;
2103: char **oprincipals = NULL;
2104:
1.1 djm 2105: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2106: ret = SSH_ERR_INVALID_FORMAT;
2107: goto out;
2108: }
1.4 djm 2109: if ((ret = sshbuf_get_cstring(principals, &principal,
2110: NULL)) != 0) {
1.1 djm 2111: ret = SSH_ERR_INVALID_FORMAT;
2112: goto out;
2113: }
2114: oprincipals = key->cert->principals;
1.51 deraadt 2115: key->cert->principals = recallocarray(key->cert->principals,
2116: key->cert->nprincipals, key->cert->nprincipals + 1,
2117: sizeof(*key->cert->principals));
1.1 djm 2118: if (key->cert->principals == NULL) {
2119: free(principal);
2120: key->cert->principals = oprincipals;
2121: ret = SSH_ERR_ALLOC_FAIL;
2122: goto out;
2123: }
2124: key->cert->principals[key->cert->nprincipals++] = principal;
2125: }
2126:
1.4 djm 2127: /*
2128: * Stash a copies of the critical options and extensions sections
2129: * for later use.
2130: */
2131: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2132: (exts != NULL &&
2133: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2134: goto out;
2135:
1.4 djm 2136: /*
2137: * Validate critical options and extensions sections format.
2138: */
2139: while (sshbuf_len(crit) != 0) {
2140: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2141: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2142: sshbuf_reset(key->cert->critical);
1.1 djm 2143: ret = SSH_ERR_INVALID_FORMAT;
2144: goto out;
2145: }
2146: }
1.4 djm 2147: while (exts != NULL && sshbuf_len(exts) != 0) {
2148: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2149: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2150: sshbuf_reset(key->cert->extensions);
1.1 djm 2151: ret = SSH_ERR_INVALID_FORMAT;
2152: goto out;
2153: }
2154: }
2155:
1.4 djm 2156: /* Parse CA key and check signature */
1.14 djm 2157: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2158: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2159: goto out;
2160: }
2161: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2162: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2163: goto out;
2164: }
2165: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 2166: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 2167: goto out;
1.82 djm 2168: if ((ret = sshkey_get_sigtype(sig, slen,
2169: &key->cert->signature_type)) != 0)
1.67 djm 2170: goto out;
1.4 djm 2171:
2172: /* Success */
1.1 djm 2173: ret = 0;
2174: out:
1.14 djm 2175: sshbuf_free(ca);
1.4 djm 2176: sshbuf_free(crit);
2177: sshbuf_free(exts);
2178: sshbuf_free(principals);
1.1 djm 2179: free(sig);
2180: return ret;
2181: }
2182:
1.122 djm 2183: int
2184: sshkey_check_rsa_length(const struct sshkey *k, int min_size)
2185: {
1.83 djm 2186: #ifdef WITH_OPENSSL
1.69 djm 2187: const BIGNUM *rsa_n;
1.122 djm 2188: int nbits;
1.69 djm 2189:
1.122 djm 2190: if (k == NULL || k->rsa == NULL ||
2191: (k->type != KEY_RSA && k->type != KEY_RSA_CERT))
2192: return 0;
2193: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
2194: nbits = BN_num_bits(rsa_n);
2195: if (nbits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
2196: (min_size > 0 && nbits < min_size))
1.69 djm 2197: return SSH_ERR_KEY_LENGTH;
1.122 djm 2198: #endif /* WITH_OPENSSL */
1.69 djm 2199: return 0;
2200: }
2201:
2202: static int
1.14 djm 2203: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2204: int allow_cert)
1.1 djm 2205: {
1.12 djm 2206: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2207: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2208: struct sshkey *key = NULL;
2209: size_t len;
2210: u_char *pk = NULL;
1.14 djm 2211: struct sshbuf *copy;
1.1 djm 2212: #ifdef WITH_OPENSSL
2213: EC_POINT *q = NULL;
1.69 djm 2214: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2215: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2216: #endif /* WITH_OPENSSL */
2217:
2218: #ifdef DEBUG_PK /* XXX */
1.14 djm 2219: sshbuf_dump(b, stderr);
1.1 djm 2220: #endif
1.32 djm 2221: if (keyp != NULL)
2222: *keyp = NULL;
1.14 djm 2223: if ((copy = sshbuf_fromb(b)) == NULL) {
2224: ret = SSH_ERR_ALLOC_FAIL;
2225: goto out;
2226: }
1.1 djm 2227: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2228: ret = SSH_ERR_INVALID_FORMAT;
2229: goto out;
2230: }
2231:
2232: type = sshkey_type_from_name(ktype);
2233: if (!allow_cert && sshkey_type_is_cert(type)) {
2234: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2235: goto out;
2236: }
2237: switch (type) {
2238: #ifdef WITH_OPENSSL
2239: case KEY_RSA_CERT:
1.14 djm 2240: /* Skip nonce */
1.1 djm 2241: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2242: ret = SSH_ERR_INVALID_FORMAT;
2243: goto out;
2244: }
2245: /* FALLTHROUGH */
2246: case KEY_RSA:
2247: if ((key = sshkey_new(type)) == NULL) {
2248: ret = SSH_ERR_ALLOC_FAIL;
2249: goto out;
2250: }
1.73 djm 2251: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2252: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2253: ret = SSH_ERR_INVALID_FORMAT;
2254: goto out;
2255: }
1.69 djm 2256: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2257: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2258: goto out;
2259: }
1.69 djm 2260: rsa_n = rsa_e = NULL; /* transferred */
1.122 djm 2261: if ((ret = sshkey_check_rsa_length(key, 0)) != 0)
1.69 djm 2262: goto out;
1.1 djm 2263: #ifdef DEBUG_PK
2264: RSA_print_fp(stderr, key->rsa, 8);
2265: #endif
2266: break;
2267: case KEY_DSA_CERT:
1.14 djm 2268: /* Skip nonce */
1.1 djm 2269: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2270: ret = SSH_ERR_INVALID_FORMAT;
2271: goto out;
2272: }
2273: /* FALLTHROUGH */
2274: case KEY_DSA:
2275: if ((key = sshkey_new(type)) == NULL) {
2276: ret = SSH_ERR_ALLOC_FAIL;
2277: goto out;
2278: }
1.73 djm 2279: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2280: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2281: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2282: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2283: ret = SSH_ERR_INVALID_FORMAT;
2284: goto out;
2285: }
1.69 djm 2286: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2287: ret = SSH_ERR_LIBCRYPTO_ERROR;
2288: goto out;
2289: }
2290: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2291: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2292: ret = SSH_ERR_LIBCRYPTO_ERROR;
2293: goto out;
2294: }
2295: dsa_pub_key = NULL; /* transferred */
1.1 djm 2296: #ifdef DEBUG_PK
2297: DSA_print_fp(stderr, key->dsa, 8);
2298: #endif
2299: break;
2300: case KEY_ECDSA_CERT:
1.85 djm 2301: case KEY_ECDSA_SK_CERT:
1.14 djm 2302: /* Skip nonce */
1.1 djm 2303: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2304: ret = SSH_ERR_INVALID_FORMAT;
2305: goto out;
2306: }
2307: /* FALLTHROUGH */
2308: case KEY_ECDSA:
1.85 djm 2309: case KEY_ECDSA_SK:
1.1 djm 2310: if ((key = sshkey_new(type)) == NULL) {
2311: ret = SSH_ERR_ALLOC_FAIL;
2312: goto out;
2313: }
1.12 djm 2314: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2315: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2316: ret = SSH_ERR_INVALID_FORMAT;
2317: goto out;
2318: }
2319: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2320: ret = SSH_ERR_EC_CURVE_MISMATCH;
2321: goto out;
2322: }
1.60 jsing 2323: EC_KEY_free(key->ecdsa);
1.1 djm 2324: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2325: == NULL) {
2326: ret = SSH_ERR_EC_CURVE_INVALID;
2327: goto out;
2328: }
2329: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2330: ret = SSH_ERR_ALLOC_FAIL;
2331: goto out;
2332: }
2333: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2334: ret = SSH_ERR_INVALID_FORMAT;
2335: goto out;
2336: }
2337: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2338: q) != 0) {
2339: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2340: goto out;
2341: }
2342: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2343: /* XXX assume it is a allocation error */
2344: ret = SSH_ERR_ALLOC_FAIL;
2345: goto out;
2346: }
2347: #ifdef DEBUG_PK
2348: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2349: #endif
1.85 djm 2350: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2351: /* Parse additional security-key application string */
2352: if (sshbuf_get_cstring(b, &key->sk_application,
2353: NULL) != 0) {
2354: ret = SSH_ERR_INVALID_FORMAT;
2355: goto out;
2356: }
2357: #ifdef DEBUG_PK
2358: fprintf(stderr, "App: %s\n", key->sk_application);
2359: #endif
2360: }
1.1 djm 2361: break;
2362: #endif /* WITH_OPENSSL */
2363: case KEY_ED25519_CERT:
1.90 markus 2364: case KEY_ED25519_SK_CERT:
1.14 djm 2365: /* Skip nonce */
1.1 djm 2366: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2367: ret = SSH_ERR_INVALID_FORMAT;
2368: goto out;
2369: }
2370: /* FALLTHROUGH */
2371: case KEY_ED25519:
1.90 markus 2372: case KEY_ED25519_SK:
1.1 djm 2373: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2374: goto out;
2375: if (len != ED25519_PK_SZ) {
2376: ret = SSH_ERR_INVALID_FORMAT;
2377: goto out;
2378: }
2379: if ((key = sshkey_new(type)) == NULL) {
2380: ret = SSH_ERR_ALLOC_FAIL;
2381: goto out;
2382: }
1.90 markus 2383: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2384: /* Parse additional security-key application string */
2385: if (sshbuf_get_cstring(b, &key->sk_application,
2386: NULL) != 0) {
2387: ret = SSH_ERR_INVALID_FORMAT;
2388: goto out;
2389: }
2390: #ifdef DEBUG_PK
2391: fprintf(stderr, "App: %s\n", key->sk_application);
2392: #endif
2393: }
1.1 djm 2394: key->ed25519_pk = pk;
2395: pk = NULL;
2396: break;
1.62 markus 2397: #ifdef WITH_XMSS
2398: case KEY_XMSS_CERT:
2399: /* Skip nonce */
2400: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2401: ret = SSH_ERR_INVALID_FORMAT;
2402: goto out;
2403: }
2404: /* FALLTHROUGH */
2405: case KEY_XMSS:
2406: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2407: goto out;
2408: if ((key = sshkey_new(type)) == NULL) {
2409: ret = SSH_ERR_ALLOC_FAIL;
2410: goto out;
2411: }
2412: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2413: goto out;
2414: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2415: goto out;
2416: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2417: ret = SSH_ERR_INVALID_FORMAT;
2418: goto out;
2419: }
2420: key->xmss_pk = pk;
2421: pk = NULL;
2422: if (type != KEY_XMSS_CERT &&
2423: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2424: goto out;
2425: break;
2426: #endif /* WITH_XMSS */
1.1 djm 2427: case KEY_UNSPEC:
2428: default:
2429: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2430: goto out;
2431: }
2432:
2433: /* Parse certificate potion */
1.14 djm 2434: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2435: goto out;
2436:
2437: if (key != NULL && sshbuf_len(b) != 0) {
2438: ret = SSH_ERR_INVALID_FORMAT;
2439: goto out;
2440: }
2441: ret = 0;
1.32 djm 2442: if (keyp != NULL) {
2443: *keyp = key;
2444: key = NULL;
2445: }
1.1 djm 2446: out:
1.14 djm 2447: sshbuf_free(copy);
1.1 djm 2448: sshkey_free(key);
1.62 markus 2449: free(xmss_name);
1.1 djm 2450: free(ktype);
2451: free(curve);
2452: free(pk);
2453: #ifdef WITH_OPENSSL
1.60 jsing 2454: EC_POINT_free(q);
1.69 djm 2455: BN_clear_free(rsa_n);
2456: BN_clear_free(rsa_e);
2457: BN_clear_free(dsa_p);
2458: BN_clear_free(dsa_q);
2459: BN_clear_free(dsa_g);
2460: BN_clear_free(dsa_pub_key);
1.1 djm 2461: #endif /* WITH_OPENSSL */
2462: return ret;
2463: }
2464:
2465: int
2466: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2467: {
1.14 djm 2468: struct sshbuf *b;
2469: int r;
2470:
2471: if ((b = sshbuf_from(blob, blen)) == NULL)
2472: return SSH_ERR_ALLOC_FAIL;
2473: r = sshkey_from_blob_internal(b, keyp, 1);
2474: sshbuf_free(b);
2475: return r;
2476: }
2477:
2478: int
2479: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2480: {
2481: return sshkey_from_blob_internal(b, keyp, 1);
2482: }
2483:
2484: int
2485: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2486: {
2487: struct sshbuf *b;
2488: int r;
2489:
2490: if ((r = sshbuf_froms(buf, &b)) != 0)
2491: return r;
2492: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2493: sshbuf_free(b);
2494: return r;
2495: }
2496:
1.82 djm 2497: int
2498: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2499: {
2500: int r;
2501: struct sshbuf *b = NULL;
2502: char *sigtype = NULL;
2503:
2504: if (sigtypep != NULL)
2505: *sigtypep = NULL;
2506: if ((b = sshbuf_from(sig, siglen)) == NULL)
2507: return SSH_ERR_ALLOC_FAIL;
2508: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2509: goto out;
2510: /* success */
2511: if (sigtypep != NULL) {
2512: *sigtypep = sigtype;
2513: sigtype = NULL;
2514: }
2515: r = 0;
2516: out:
2517: free(sigtype);
1.14 djm 2518: sshbuf_free(b);
2519: return r;
1.68 djm 2520: }
2521:
2522: /*
2523: *
2524: * Checks whether a certificate's signature type is allowed.
2525: * Returns 0 (success) if the certificate signature type appears in the
2526: * "allowed" pattern-list, or the key is not a certificate to begin with.
2527: * Otherwise returns a ssherr.h code.
2528: */
2529: int
2530: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2531: {
2532: if (key == NULL || allowed == NULL)
2533: return SSH_ERR_INVALID_ARGUMENT;
2534: if (!sshkey_type_is_cert(key->type))
2535: return 0;
2536: if (key->cert == NULL || key->cert->signature_type == NULL)
2537: return SSH_ERR_INVALID_ARGUMENT;
2538: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2539: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2540: return 0;
1.65 djm 2541: }
2542:
2543: /*
2544: * Returns the expected signature algorithm for a given public key algorithm.
2545: */
1.66 djm 2546: const char *
2547: sshkey_sigalg_by_name(const char *name)
1.65 djm 2548: {
1.123 djm 2549: const struct sshkey_impl *impl;
2550: int i;
1.65 djm 2551:
1.123 djm 2552: for (i = 0; keyimpls[i] != NULL; i++) {
2553: impl = keyimpls[i];
2554: if (strcmp(impl->name, name) != 0)
1.65 djm 2555: continue;
1.123 djm 2556: if (impl->sigalg != NULL)
2557: return impl->sigalg;
2558: if (!impl->cert)
2559: return impl->name;
1.65 djm 2560: return sshkey_ssh_name_from_type_nid(
1.123 djm 2561: sshkey_type_plain(impl->type), impl->nid);
1.65 djm 2562: }
2563: return NULL;
2564: }
2565:
2566: /*
2567: * Verifies that the signature algorithm appearing inside the signature blob
2568: * matches that which was requested.
2569: */
2570: int
2571: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2572: const char *requested_alg)
2573: {
2574: const char *expected_alg;
2575: char *sigtype = NULL;
2576: int r;
2577:
2578: if (requested_alg == NULL)
2579: return 0;
1.66 djm 2580: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2581: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2582: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2583: return r;
2584: r = strcmp(expected_alg, sigtype) == 0;
2585: free(sigtype);
2586: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2587: }
2588:
2589: int
1.76 djm 2590: sshkey_sign(struct sshkey *key,
1.1 djm 2591: u_char **sigp, size_t *lenp,
1.86 djm 2592: const u_char *data, size_t datalen,
1.111 djm 2593: const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
1.1 djm 2594: {
1.76 djm 2595: int was_shielded = sshkey_is_shielded(key);
2596: int r2, r = SSH_ERR_INTERNAL_ERROR;
2597:
1.1 djm 2598: if (sigp != NULL)
2599: *sigp = NULL;
2600: if (lenp != NULL)
2601: *lenp = 0;
2602: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2603: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2604: if ((r = sshkey_unshield_private(key)) != 0)
2605: return r;
1.1 djm 2606: switch (key->type) {
2607: #ifdef WITH_OPENSSL
2608: case KEY_DSA_CERT:
2609: case KEY_DSA:
1.76 djm 2610: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2611: break;
1.1 djm 2612: case KEY_ECDSA_CERT:
2613: case KEY_ECDSA:
1.76 djm 2614: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2615: break;
1.1 djm 2616: case KEY_RSA_CERT:
2617: case KEY_RSA:
1.76 djm 2618: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2619: break;
1.1 djm 2620: #endif /* WITH_OPENSSL */
2621: case KEY_ED25519:
2622: case KEY_ED25519_CERT:
1.76 djm 2623: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2624: break;
2625: case KEY_ED25519_SK:
2626: case KEY_ED25519_SK_CERT:
1.97 djm 2627: case KEY_ECDSA_SK_CERT:
2628: case KEY_ECDSA_SK:
2629: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
1.111 djm 2630: datalen, compat, sk_pin);
1.76 djm 2631: break;
1.62 markus 2632: #ifdef WITH_XMSS
2633: case KEY_XMSS:
2634: case KEY_XMSS_CERT:
1.76 djm 2635: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2636: break;
1.62 markus 2637: #endif /* WITH_XMSS */
1.1 djm 2638: default:
1.76 djm 2639: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2640: break;
1.1 djm 2641: }
1.76 djm 2642: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2643: return r2;
2644: return r;
1.1 djm 2645: }
2646:
2647: /*
2648: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2649: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2650: */
2651: int
2652: sshkey_verify(const struct sshkey *key,
2653: const u_char *sig, size_t siglen,
1.96 djm 2654: const u_char *data, size_t dlen, const char *alg, u_int compat,
2655: struct sshkey_sig_details **detailsp)
1.1 djm 2656: {
1.96 djm 2657: if (detailsp != NULL)
2658: *detailsp = NULL;
1.6 djm 2659: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2660: return SSH_ERR_INVALID_ARGUMENT;
2661: switch (key->type) {
2662: #ifdef WITH_OPENSSL
2663: case KEY_DSA_CERT:
2664: case KEY_DSA:
2665: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2666: case KEY_ECDSA_CERT:
2667: case KEY_ECDSA:
2668: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2669: case KEY_ECDSA_SK_CERT:
2670: case KEY_ECDSA_SK:
2671: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2672: compat, detailsp);
1.1 djm 2673: case KEY_RSA_CERT:
2674: case KEY_RSA:
1.59 djm 2675: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2676: #endif /* WITH_OPENSSL */
2677: case KEY_ED25519:
2678: case KEY_ED25519_CERT:
2679: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2680: case KEY_ED25519_SK:
2681: case KEY_ED25519_SK_CERT:
2682: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2683: compat, detailsp);
1.62 markus 2684: #ifdef WITH_XMSS
2685: case KEY_XMSS:
2686: case KEY_XMSS_CERT:
2687: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2688: #endif /* WITH_XMSS */
1.1 djm 2689: default:
2690: return SSH_ERR_KEY_TYPE_UNKNOWN;
2691: }
2692: }
2693:
2694: /* Convert a plain key to their _CERT equivalent */
2695: int
1.20 djm 2696: sshkey_to_certified(struct sshkey *k)
1.1 djm 2697: {
2698: int newtype;
2699:
2700: switch (k->type) {
2701: #ifdef WITH_OPENSSL
2702: case KEY_RSA:
1.20 djm 2703: newtype = KEY_RSA_CERT;
1.1 djm 2704: break;
2705: case KEY_DSA:
1.20 djm 2706: newtype = KEY_DSA_CERT;
1.1 djm 2707: break;
2708: case KEY_ECDSA:
2709: newtype = KEY_ECDSA_CERT;
2710: break;
1.85 djm 2711: case KEY_ECDSA_SK:
2712: newtype = KEY_ECDSA_SK_CERT;
2713: break;
1.1 djm 2714: #endif /* WITH_OPENSSL */
1.90 markus 2715: case KEY_ED25519_SK:
2716: newtype = KEY_ED25519_SK_CERT;
2717: break;
1.1 djm 2718: case KEY_ED25519:
2719: newtype = KEY_ED25519_CERT;
2720: break;
1.62 markus 2721: #ifdef WITH_XMSS
2722: case KEY_XMSS:
2723: newtype = KEY_XMSS_CERT;
2724: break;
2725: #endif /* WITH_XMSS */
1.1 djm 2726: default:
2727: return SSH_ERR_INVALID_ARGUMENT;
2728: }
2729: if ((k->cert = cert_new()) == NULL)
2730: return SSH_ERR_ALLOC_FAIL;
2731: k->type = newtype;
2732: return 0;
2733: }
2734:
2735: /* Convert a certificate to its raw key equivalent */
2736: int
2737: sshkey_drop_cert(struct sshkey *k)
2738: {
2739: if (!sshkey_type_is_cert(k->type))
2740: return SSH_ERR_KEY_TYPE_UNKNOWN;
2741: cert_free(k->cert);
2742: k->cert = NULL;
2743: k->type = sshkey_type_plain(k->type);
2744: return 0;
2745: }
2746:
2747: /* Sign a certified key, (re-)generating the signed certblob. */
2748: int
1.53 djm 2749: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2750: const char *sk_provider, const char *sk_pin,
2751: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2752: {
2753: struct sshbuf *principals = NULL;
2754: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2755: size_t i, ca_len, sig_len;
2756: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2757: struct sshbuf *cert = NULL;
2758: char *sigtype = NULL;
1.69 djm 2759: #ifdef WITH_OPENSSL
2760: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2761: #endif /* WITH_OPENSSL */
1.1 djm 2762:
2763: if (k == NULL || k->cert == NULL ||
2764: k->cert->certblob == NULL || ca == NULL)
2765: return SSH_ERR_INVALID_ARGUMENT;
2766: if (!sshkey_is_cert(k))
2767: return SSH_ERR_KEY_TYPE_UNKNOWN;
2768: if (!sshkey_type_is_valid_ca(ca->type))
2769: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2770:
1.67 djm 2771: /*
2772: * If no alg specified as argument but a signature_type was set,
2773: * then prefer that. If both were specified, then they must match.
2774: */
2775: if (alg == NULL)
2776: alg = k->cert->signature_type;
2777: else if (k->cert->signature_type != NULL &&
2778: strcmp(alg, k->cert->signature_type) != 0)
2779: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2780:
2781: /*
2782: * If no signing algorithm or signature_type was specified and we're
2783: * using a RSA key, then default to a good signature algorithm.
2784: */
2785: if (alg == NULL && ca->type == KEY_RSA)
2786: alg = "rsa-sha2-512";
1.67 djm 2787:
1.1 djm 2788: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2789: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2790:
2791: cert = k->cert->certblob; /* for readability */
2792: sshbuf_reset(cert);
2793: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2794: goto out;
2795:
2796: /* -v01 certs put nonce first */
2797: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2798: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2799: goto out;
1.1 djm 2800:
2801: /* XXX this substantially duplicates to_blob(); refactor */
2802: switch (k->type) {
2803: #ifdef WITH_OPENSSL
2804: case KEY_DSA_CERT:
1.69 djm 2805: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2806: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2807: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2808: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2809: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2810: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2811: goto out;
2812: break;
2813: case KEY_ECDSA_CERT:
1.85 djm 2814: case KEY_ECDSA_SK_CERT:
1.1 djm 2815: if ((ret = sshbuf_put_cstring(cert,
2816: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2817: (ret = sshbuf_put_ec(cert,
2818: EC_KEY_get0_public_key(k->ecdsa),
2819: EC_KEY_get0_group(k->ecdsa))) != 0)
2820: goto out;
1.85 djm 2821: if (k->type == KEY_ECDSA_SK_CERT) {
2822: if ((ret = sshbuf_put_cstring(cert,
2823: k->sk_application)) != 0)
2824: goto out;
2825: }
1.1 djm 2826: break;
2827: case KEY_RSA_CERT:
1.69 djm 2828: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2829: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2830: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2831: goto out;
2832: break;
2833: #endif /* WITH_OPENSSL */
2834: case KEY_ED25519_CERT:
1.94 djm 2835: case KEY_ED25519_SK_CERT:
1.1 djm 2836: if ((ret = sshbuf_put_string(cert,
2837: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2838: goto out;
1.94 djm 2839: if (k->type == KEY_ED25519_SK_CERT) {
2840: if ((ret = sshbuf_put_cstring(cert,
2841: k->sk_application)) != 0)
2842: goto out;
2843: }
1.1 djm 2844: break;
1.62 markus 2845: #ifdef WITH_XMSS
2846: case KEY_XMSS_CERT:
2847: if (k->xmss_name == NULL) {
2848: ret = SSH_ERR_INVALID_ARGUMENT;
2849: goto out;
2850: }
2851: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2852: (ret = sshbuf_put_string(cert,
2853: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2854: goto out;
2855: break;
2856: #endif /* WITH_XMSS */
1.1 djm 2857: default:
2858: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2859: goto out;
1.1 djm 2860: }
2861:
1.20 djm 2862: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2863: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2864: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2865: goto out;
2866:
2867: if ((principals = sshbuf_new()) == NULL) {
2868: ret = SSH_ERR_ALLOC_FAIL;
2869: goto out;
2870: }
2871: for (i = 0; i < k->cert->nprincipals; i++) {
2872: if ((ret = sshbuf_put_cstring(principals,
2873: k->cert->principals[i])) != 0)
2874: goto out;
2875: }
2876: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2877: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2878: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2879: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2880: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2881: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2882: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2883: goto out;
2884:
2885: /* Sign the whole mess */
1.53 djm 2886: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.111 djm 2887: sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
1.1 djm 2888: goto out;
1.67 djm 2889: /* Check and update signature_type against what was actually used */
1.82 djm 2890: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2891: goto out;
2892: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2893: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2894: goto out;
2895: }
2896: if (k->cert->signature_type == NULL) {
2897: k->cert->signature_type = sigtype;
2898: sigtype = NULL;
2899: }
1.1 djm 2900: /* Append signature and we are done */
2901: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2902: goto out;
2903: ret = 0;
2904: out:
2905: if (ret != 0)
2906: sshbuf_reset(cert);
1.29 mmcc 2907: free(sig_blob);
2908: free(ca_blob);
1.67 djm 2909: free(sigtype);
1.31 mmcc 2910: sshbuf_free(principals);
1.1 djm 2911: return ret;
1.53 djm 2912: }
2913:
2914: static int
1.76 djm 2915: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2916: const u_char *data, size_t datalen,
1.111 djm 2917: const char *alg, const char *sk_provider, const char *sk_pin,
2918: u_int compat, void *ctx)
1.53 djm 2919: {
2920: if (ctx != NULL)
2921: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2922: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
1.111 djm 2923: sk_provider, sk_pin, compat);
1.53 djm 2924: }
2925:
2926: int
1.86 djm 2927: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
1.111 djm 2928: const char *sk_provider, const char *sk_pin)
1.53 djm 2929: {
1.111 djm 2930: return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
1.86 djm 2931: default_key_sign, NULL);
1.1 djm 2932: }
2933:
2934: int
2935: sshkey_cert_check_authority(const struct sshkey *k,
1.114 djm 2936: int want_host, int require_principal, int wildcard_pattern,
1.119 djm 2937: uint64_t verify_time, const char *name, const char **reason)
1.1 djm 2938: {
2939: u_int i, principal_matches;
2940:
1.102 markus 2941: if (reason == NULL)
2942: return SSH_ERR_INVALID_ARGUMENT;
1.114 djm 2943: if (!sshkey_is_cert(k)) {
2944: *reason = "Key is not a certificate";
2945: return SSH_ERR_KEY_CERT_INVALID;
2946: }
1.1 djm 2947: if (want_host) {
2948: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2949: *reason = "Certificate invalid: not a host certificate";
2950: return SSH_ERR_KEY_CERT_INVALID;
2951: }
2952: } else {
2953: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2954: *reason = "Certificate invalid: not a user certificate";
2955: return SSH_ERR_KEY_CERT_INVALID;
2956: }
2957: }
1.119 djm 2958: if (verify_time < k->cert->valid_after) {
1.1 djm 2959: *reason = "Certificate invalid: not yet valid";
2960: return SSH_ERR_KEY_CERT_INVALID;
2961: }
1.119 djm 2962: if (verify_time >= k->cert->valid_before) {
1.1 djm 2963: *reason = "Certificate invalid: expired";
2964: return SSH_ERR_KEY_CERT_INVALID;
2965: }
2966: if (k->cert->nprincipals == 0) {
2967: if (require_principal) {
2968: *reason = "Certificate lacks principal list";
2969: return SSH_ERR_KEY_CERT_INVALID;
2970: }
2971: } else if (name != NULL) {
2972: principal_matches = 0;
2973: for (i = 0; i < k->cert->nprincipals; i++) {
1.114 djm 2974: if (wildcard_pattern) {
2975: if (match_pattern(k->cert->principals[i],
2976: name)) {
2977: principal_matches = 1;
2978: break;
2979: }
2980: } else if (strcmp(name, k->cert->principals[i]) == 0) {
1.1 djm 2981: principal_matches = 1;
2982: break;
2983: }
2984: }
2985: if (!principal_matches) {
2986: *reason = "Certificate invalid: name is not a listed "
2987: "principal";
2988: return SSH_ERR_KEY_CERT_INVALID;
2989: }
1.114 djm 2990: }
2991: return 0;
2992: }
2993:
2994: int
1.119 djm 2995: sshkey_cert_check_authority_now(const struct sshkey *k,
2996: int want_host, int require_principal, int wildcard_pattern,
2997: const char *name, const char **reason)
2998: {
2999: time_t now;
3000:
3001: if ((now = time(NULL)) < 0) {
3002: /* yikes - system clock before epoch! */
3003: *reason = "Certificate invalid: not yet valid";
3004: return SSH_ERR_KEY_CERT_INVALID;
3005: }
3006: return sshkey_cert_check_authority(k, want_host, require_principal,
3007: wildcard_pattern, (uint64_t)now, name, reason);
3008: }
3009:
3010: int
1.114 djm 3011: sshkey_cert_check_host(const struct sshkey *key, const char *host,
3012: int wildcard_principals, const char *ca_sign_algorithms,
3013: const char **reason)
3014: {
3015: int r;
3016:
1.119 djm 3017: if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
1.114 djm 3018: host, reason)) != 0)
3019: return r;
3020: if (sshbuf_len(key->cert->critical) != 0) {
3021: *reason = "Certificate contains unsupported critical options";
3022: return SSH_ERR_KEY_CERT_INVALID;
3023: }
3024: if (ca_sign_algorithms != NULL &&
3025: (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
3026: *reason = "Certificate signed with disallowed algorithm";
3027: return SSH_ERR_KEY_CERT_INVALID;
1.1 djm 3028: }
3029: return 0;
1.27 djm 3030: }
3031:
3032: size_t
3033: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
3034: {
1.113 dtucker 3035: char from[32], to[32], ret[128];
1.27 djm 3036:
3037: *from = *to = '\0';
3038: if (cert->valid_after == 0 &&
3039: cert->valid_before == 0xffffffffffffffffULL)
3040: return strlcpy(s, "forever", l);
3041:
1.118 dtucker 3042: if (cert->valid_after != 0)
3043: format_absolute_time(cert->valid_after, from, sizeof(from));
3044: if (cert->valid_before != 0xffffffffffffffffULL)
3045: format_absolute_time(cert->valid_before, to, sizeof(to));
1.27 djm 3046:
3047: if (cert->valid_after == 0)
3048: snprintf(ret, sizeof(ret), "before %s", to);
3049: else if (cert->valid_before == 0xffffffffffffffffULL)
3050: snprintf(ret, sizeof(ret), "after %s", from);
3051: else
3052: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
3053:
3054: return strlcpy(s, ret, l);
1.1 djm 3055: }
3056:
3057: int
1.76 djm 3058: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 3059: enum sshkey_serialize_rep opts)
1.1 djm 3060: {
3061: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 3062: int was_shielded = sshkey_is_shielded(key);
3063: struct sshbuf *b = NULL;
1.69 djm 3064: #ifdef WITH_OPENSSL
3065: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
3066: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
3067: #endif /* WITH_OPENSSL */
1.1 djm 3068:
1.76 djm 3069: if ((r = sshkey_unshield_private(key)) != 0)
3070: return r;
3071: if ((b = sshbuf_new()) == NULL)
3072: return SSH_ERR_ALLOC_FAIL;
1.1 djm 3073: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
3074: goto out;
3075: switch (key->type) {
3076: #ifdef WITH_OPENSSL
3077: case KEY_RSA:
1.69 djm 3078: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
3079: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3080: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
3081: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
3082: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
3083: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3084: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3085: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3086: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3087: goto out;
3088: break;
3089: case KEY_RSA_CERT:
3090: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3091: r = SSH_ERR_INVALID_ARGUMENT;
3092: goto out;
3093: }
1.69 djm 3094: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
3095: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3096: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 3097: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3098: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3099: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3100: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3101: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3102: goto out;
3103: break;
3104: case KEY_DSA:
1.69 djm 3105: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
3106: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
3107: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
3108: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
3109: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
3110: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3111: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3112: goto out;
3113: break;
3114: case KEY_DSA_CERT:
3115: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3116: r = SSH_ERR_INVALID_ARGUMENT;
3117: goto out;
3118: }
1.69 djm 3119: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3120: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3121: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3122: goto out;
3123: break;
3124: case KEY_ECDSA:
3125: if ((r = sshbuf_put_cstring(b,
3126: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3127: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3128: (r = sshbuf_put_bignum2(b,
3129: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3130: goto out;
3131: break;
3132: case KEY_ECDSA_CERT:
3133: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3134: r = SSH_ERR_INVALID_ARGUMENT;
3135: goto out;
3136: }
3137: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3138: (r = sshbuf_put_bignum2(b,
3139: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3140: goto out;
3141: break;
1.85 djm 3142: case KEY_ECDSA_SK:
3143: if ((r = sshbuf_put_cstring(b,
3144: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3145: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3146: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3147: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3148: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3149: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3150: goto out;
3151: break;
3152: case KEY_ECDSA_SK_CERT:
3153: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3154: r = SSH_ERR_INVALID_ARGUMENT;
3155: goto out;
3156: }
3157: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3158: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3159: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3160: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3161: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3162: goto out;
3163: break;
1.1 djm 3164: #endif /* WITH_OPENSSL */
3165: case KEY_ED25519:
3166: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3167: ED25519_PK_SZ)) != 0 ||
3168: (r = sshbuf_put_string(b, key->ed25519_sk,
3169: ED25519_SK_SZ)) != 0)
3170: goto out;
3171: break;
3172: case KEY_ED25519_CERT:
3173: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3174: r = SSH_ERR_INVALID_ARGUMENT;
3175: goto out;
3176: }
3177: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3178: (r = sshbuf_put_string(b, key->ed25519_pk,
3179: ED25519_PK_SZ)) != 0 ||
3180: (r = sshbuf_put_string(b, key->ed25519_sk,
3181: ED25519_SK_SZ)) != 0)
3182: goto out;
3183: break;
1.90 markus 3184: case KEY_ED25519_SK:
3185: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3186: ED25519_PK_SZ)) != 0 ||
3187: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3188: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3189: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3190: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3191: goto out;
3192: break;
3193: case KEY_ED25519_SK_CERT:
3194: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3195: r = SSH_ERR_INVALID_ARGUMENT;
3196: goto out;
3197: }
3198: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3199: (r = sshbuf_put_string(b, key->ed25519_pk,
3200: ED25519_PK_SZ)) != 0 ||
3201: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3202: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3203: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3204: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3205: goto out;
3206: break;
1.62 markus 3207: #ifdef WITH_XMSS
3208: case KEY_XMSS:
3209: if (key->xmss_name == NULL) {
3210: r = SSH_ERR_INVALID_ARGUMENT;
3211: goto out;
3212: }
3213: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3214: (r = sshbuf_put_string(b, key->xmss_pk,
3215: sshkey_xmss_pklen(key))) != 0 ||
3216: (r = sshbuf_put_string(b, key->xmss_sk,
3217: sshkey_xmss_sklen(key))) != 0 ||
3218: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3219: goto out;
3220: break;
3221: case KEY_XMSS_CERT:
3222: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3223: key->xmss_name == NULL) {
3224: r = SSH_ERR_INVALID_ARGUMENT;
3225: goto out;
3226: }
3227: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3228: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3229: (r = sshbuf_put_string(b, key->xmss_pk,
3230: sshkey_xmss_pklen(key))) != 0 ||
3231: (r = sshbuf_put_string(b, key->xmss_sk,
3232: sshkey_xmss_sklen(key))) != 0 ||
3233: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3234: goto out;
3235: break;
3236: #endif /* WITH_XMSS */
1.1 djm 3237: default:
3238: r = SSH_ERR_INVALID_ARGUMENT;
3239: goto out;
3240: }
1.76 djm 3241: /*
3242: * success (but we still need to append the output to buf after
3243: * possibly re-shielding the private key)
3244: */
1.1 djm 3245: r = 0;
3246: out:
1.76 djm 3247: if (was_shielded)
3248: r = sshkey_shield_private(key);
3249: if (r == 0)
3250: r = sshbuf_putb(buf, b);
3251: sshbuf_free(b);
3252:
1.1 djm 3253: return r;
3254: }
3255:
3256: int
1.76 djm 3257: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3258: {
3259: return sshkey_private_serialize_opt(key, b,
3260: SSHKEY_SERIALIZE_DEFAULT);
3261: }
3262:
3263: int
1.1 djm 3264: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3265: {
1.62 markus 3266: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.115 djm 3267: char *expect_sk_application = NULL;
1.1 djm 3268: struct sshkey *k = NULL;
1.14 djm 3269: size_t pklen = 0, sklen = 0;
1.1 djm 3270: int type, r = SSH_ERR_INTERNAL_ERROR;
3271: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.115 djm 3272: u_char *expect_ed25519_pk = NULL;
1.62 markus 3273: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3274: #ifdef WITH_OPENSSL
3275: BIGNUM *exponent = NULL;
1.69 djm 3276: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3277: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3278: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3279: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3280: #endif /* WITH_OPENSSL */
3281:
3282: if (kp != NULL)
3283: *kp = NULL;
3284: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3285: goto out;
3286: type = sshkey_type_from_name(tname);
1.108 djm 3287: if (sshkey_type_is_cert(type)) {
3288: /*
3289: * Certificate key private keys begin with the certificate
3290: * itself. Make sure this matches the type of the enclosing
3291: * private key.
3292: */
3293: if ((r = sshkey_froms(buf, &k)) != 0)
3294: goto out;
3295: if (k->type != type) {
3296: r = SSH_ERR_KEY_CERT_MISMATCH;
3297: goto out;
3298: }
3299: /* For ECDSA keys, the group must match too */
3300: if (k->type == KEY_ECDSA &&
3301: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
3302: r = SSH_ERR_KEY_CERT_MISMATCH;
3303: goto out;
3304: }
1.115 djm 3305: /*
3306: * Several fields are redundant between certificate and
3307: * private key body, we require these to match.
3308: */
3309: expect_sk_application = k->sk_application;
3310: expect_ed25519_pk = k->ed25519_pk;
3311: k->sk_application = NULL;
3312: k->ed25519_pk = NULL;
1.108 djm 3313: } else {
1.70 djm 3314: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3315: r = SSH_ERR_ALLOC_FAIL;
3316: goto out;
3317: }
1.108 djm 3318: }
3319: switch (type) {
3320: #ifdef WITH_OPENSSL
3321: case KEY_DSA:
1.73 djm 3322: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3323: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3324: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
1.108 djm 3325: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0)
1.69 djm 3326: goto out;
3327: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3328: r = SSH_ERR_LIBCRYPTO_ERROR;
3329: goto out;
3330: }
3331: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
1.108 djm 3332: if (!DSA_set0_key(k->dsa, dsa_pub_key, NULL)) {
1.69 djm 3333: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3334: goto out;
1.69 djm 3335: }
1.108 djm 3336: dsa_pub_key = NULL; /* transferred */
3337: /* FALLTHROUGH */
1.1 djm 3338: case KEY_DSA_CERT:
1.108 djm 3339: if ((r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.84 djm 3340: goto out;
1.69 djm 3341: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3342: r = SSH_ERR_LIBCRYPTO_ERROR;
3343: goto out;
3344: }
3345: dsa_priv_key = NULL; /* transferred */
1.1 djm 3346: break;
3347: case KEY_ECDSA:
3348: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3349: r = SSH_ERR_INVALID_ARGUMENT;
3350: goto out;
3351: }
3352: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3353: goto out;
3354: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3355: r = SSH_ERR_EC_CURVE_MISMATCH;
3356: goto out;
3357: }
3358: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3359: if (k->ecdsa == NULL) {
1.1 djm 3360: r = SSH_ERR_LIBCRYPTO_ERROR;
3361: goto out;
3362: }
1.108 djm 3363: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0)
1.1 djm 3364: goto out;
1.108 djm 3365: /* FALLTHROUGH */
1.1 djm 3366: case KEY_ECDSA_CERT:
1.108 djm 3367: if ((r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3368: goto out;
3369: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3370: r = SSH_ERR_LIBCRYPTO_ERROR;
3371: goto out;
3372: }
3373: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3374: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3375: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3376: goto out;
3377: break;
1.85 djm 3378: case KEY_ECDSA_SK:
3379: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3380: r = SSH_ERR_INVALID_ARGUMENT;
3381: goto out;
3382: }
3383: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3384: goto out;
3385: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3386: r = SSH_ERR_EC_CURVE_MISMATCH;
3387: goto out;
3388: }
3389: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3390: (k->sk_reserved = sshbuf_new()) == NULL) {
3391: r = SSH_ERR_ALLOC_FAIL;
3392: goto out;
3393: }
3394: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3395: if (k->ecdsa == NULL) {
3396: r = SSH_ERR_LIBCRYPTO_ERROR;
3397: goto out;
3398: }
3399: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3400: (r = sshbuf_get_cstring(buf, &k->sk_application,
3401: NULL)) != 0 ||
3402: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3403: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3404: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3405: goto out;
3406: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3407: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3408: goto out;
3409: break;
3410: case KEY_ECDSA_SK_CERT:
3411: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3412: (k->sk_reserved = sshbuf_new()) == NULL) {
3413: r = SSH_ERR_ALLOC_FAIL;
3414: goto out;
3415: }
3416: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3417: NULL)) != 0 ||
3418: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3419: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3420: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3421: goto out;
3422: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3423: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3424: goto out;
3425: break;
1.1 djm 3426: case KEY_RSA:
1.73 djm 3427: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
1.108 djm 3428: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0)
1.1 djm 3429: goto out;
1.108 djm 3430: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, NULL)) {
1.69 djm 3431: r = SSH_ERR_LIBCRYPTO_ERROR;
3432: goto out;
3433: }
1.108 djm 3434: rsa_n = rsa_e = NULL; /* transferred */
3435: /* FALLTHROUGH */
1.1 djm 3436: case KEY_RSA_CERT:
1.108 djm 3437: if ((r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
1.73 djm 3438: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3439: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3440: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3441: goto out;
1.69 djm 3442: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3443: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3444: goto out;
3445: }
1.69 djm 3446: rsa_d = NULL; /* transferred */
3447: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3448: r = SSH_ERR_LIBCRYPTO_ERROR;
3449: goto out;
3450: }
3451: rsa_p = rsa_q = NULL; /* transferred */
1.122 djm 3452: if ((r = sshkey_check_rsa_length(k, 0)) != 0)
1.69 djm 3453: goto out;
3454: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3455: goto out;
1.1 djm 3456: break;
3457: #endif /* WITH_OPENSSL */
3458: case KEY_ED25519:
1.108 djm 3459: case KEY_ED25519_CERT:
1.1 djm 3460: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3461: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3462: goto out;
3463: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3464: r = SSH_ERR_INVALID_FORMAT;
3465: goto out;
3466: }
3467: k->ed25519_pk = ed25519_pk;
3468: k->ed25519_sk = ed25519_sk;
1.84 djm 3469: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3470: break;
1.90 markus 3471: case KEY_ED25519_SK:
1.108 djm 3472: case KEY_ED25519_SK_CERT:
1.90 markus 3473: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3474: goto out;
3475: if (pklen != ED25519_PK_SZ) {
3476: r = SSH_ERR_INVALID_FORMAT;
3477: goto out;
3478: }
3479: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3480: (k->sk_reserved = sshbuf_new()) == NULL) {
3481: r = SSH_ERR_ALLOC_FAIL;
3482: goto out;
3483: }
3484: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3485: NULL)) != 0 ||
3486: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3487: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3488: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3489: goto out;
3490: k->ed25519_pk = ed25519_pk;
3491: ed25519_pk = NULL; /* transferred */
3492: break;
1.62 markus 3493: #ifdef WITH_XMSS
3494: case KEY_XMSS:
1.108 djm 3495: case KEY_XMSS_CERT:
1.62 markus 3496: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3497: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3498: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
1.110 markus 3499: goto out;
3500: if (type == KEY_XMSS &&
3501: (r = sshkey_xmss_init(k, xmss_name)) != 0)
1.62 markus 3502: goto out;
3503: if (pklen != sshkey_xmss_pklen(k) ||
3504: sklen != sshkey_xmss_sklen(k)) {
3505: r = SSH_ERR_INVALID_FORMAT;
3506: goto out;
3507: }
3508: k->xmss_pk = xmss_pk;
3509: k->xmss_sk = xmss_sk;
3510: xmss_pk = xmss_sk = NULL;
3511: /* optional internal state */
3512: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3513: goto out;
3514: break;
3515: #endif /* WITH_XMSS */
1.1 djm 3516: default:
3517: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3518: goto out;
3519: }
3520: #ifdef WITH_OPENSSL
3521: /* enable blinding */
3522: switch (k->type) {
3523: case KEY_RSA:
3524: case KEY_RSA_CERT:
3525: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3526: r = SSH_ERR_LIBCRYPTO_ERROR;
3527: goto out;
3528: }
3529: break;
3530: }
3531: #endif /* WITH_OPENSSL */
1.115 djm 3532: if ((expect_sk_application != NULL && (k->sk_application == NULL ||
3533: strcmp(expect_sk_application, k->sk_application) != 0)) ||
3534: (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
1.116 djm 3535: memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
1.115 djm 3536: r = SSH_ERR_KEY_CERT_MISMATCH;
3537: goto out;
3538: }
1.1 djm 3539: /* success */
3540: r = 0;
3541: if (kp != NULL) {
3542: *kp = k;
3543: k = NULL;
3544: }
3545: out:
3546: free(tname);
3547: free(curve);
3548: #ifdef WITH_OPENSSL
1.60 jsing 3549: BN_clear_free(exponent);
1.69 djm 3550: BN_clear_free(dsa_p);
3551: BN_clear_free(dsa_q);
3552: BN_clear_free(dsa_g);
3553: BN_clear_free(dsa_pub_key);
3554: BN_clear_free(dsa_priv_key);
3555: BN_clear_free(rsa_n);
3556: BN_clear_free(rsa_e);
3557: BN_clear_free(rsa_d);
3558: BN_clear_free(rsa_p);
3559: BN_clear_free(rsa_q);
3560: BN_clear_free(rsa_iqmp);
1.1 djm 3561: #endif /* WITH_OPENSSL */
3562: sshkey_free(k);
1.61 jsing 3563: freezero(ed25519_pk, pklen);
3564: freezero(ed25519_sk, sklen);
1.62 markus 3565: free(xmss_name);
3566: freezero(xmss_pk, pklen);
3567: freezero(xmss_sk, sklen);
1.115 djm 3568: free(expect_sk_application);
3569: free(expect_ed25519_pk);
1.1 djm 3570: return r;
3571: }
3572:
3573: #ifdef WITH_OPENSSL
3574: int
3575: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3576: {
3577: EC_POINT *nq = NULL;
1.93 djm 3578: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 3579: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3580:
3581: /*
3582: * NB. This assumes OpenSSL has already verified that the public
3583: * point lies on the curve. This is done by EC_POINT_oct2point()
3584: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3585: * reachable with public points not unmarshalled using
3586: * EC_POINT_oct2point then the caller will need to explicitly check.
3587: */
1.1 djm 3588:
3589: /*
3590: * We shouldn't ever hit this case because bignum_get_ecpoint()
3591: * refuses to load GF2m points.
3592: */
3593: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3594: NID_X9_62_prime_field)
3595: goto out;
3596:
3597: /* Q != infinity */
3598: if (EC_POINT_is_at_infinity(group, public))
3599: goto out;
3600:
1.93 djm 3601: if ((x = BN_new()) == NULL ||
3602: (y = BN_new()) == NULL ||
3603: (order = BN_new()) == NULL ||
3604: (tmp = BN_new()) == NULL) {
1.1 djm 3605: ret = SSH_ERR_ALLOC_FAIL;
3606: goto out;
3607: }
3608:
3609: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 3610: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 3611: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 3612: x, y, NULL) != 1) {
1.1 djm 3613: ret = SSH_ERR_LIBCRYPTO_ERROR;
3614: goto out;
3615: }
3616: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3617: BN_num_bits(y) <= BN_num_bits(order) / 2)
3618: goto out;
3619:
3620: /* nQ == infinity (n == order of subgroup) */
3621: if ((nq = EC_POINT_new(group)) == NULL) {
3622: ret = SSH_ERR_ALLOC_FAIL;
3623: goto out;
3624: }
1.93 djm 3625: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 3626: ret = SSH_ERR_LIBCRYPTO_ERROR;
3627: goto out;
3628: }
3629: if (EC_POINT_is_at_infinity(group, nq) != 1)
3630: goto out;
3631:
3632: /* x < order - 1, y < order - 1 */
3633: if (!BN_sub(tmp, order, BN_value_one())) {
3634: ret = SSH_ERR_LIBCRYPTO_ERROR;
3635: goto out;
3636: }
3637: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3638: goto out;
3639: ret = 0;
3640: out:
1.93 djm 3641: BN_clear_free(x);
3642: BN_clear_free(y);
3643: BN_clear_free(order);
3644: BN_clear_free(tmp);
1.60 jsing 3645: EC_POINT_free(nq);
1.1 djm 3646: return ret;
3647: }
3648:
3649: int
3650: sshkey_ec_validate_private(const EC_KEY *key)
3651: {
1.93 djm 3652: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3653: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3654:
1.93 djm 3655: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3656: ret = SSH_ERR_ALLOC_FAIL;
3657: goto out;
3658: }
3659:
3660: /* log2(private) > log2(order)/2 */
1.93 djm 3661: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3662: ret = SSH_ERR_LIBCRYPTO_ERROR;
3663: goto out;
3664: }
3665: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3666: BN_num_bits(order) / 2)
3667: goto out;
3668:
3669: /* private < order - 1 */
3670: if (!BN_sub(tmp, order, BN_value_one())) {
3671: ret = SSH_ERR_LIBCRYPTO_ERROR;
3672: goto out;
3673: }
3674: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3675: goto out;
3676: ret = 0;
3677: out:
1.93 djm 3678: BN_clear_free(order);
3679: BN_clear_free(tmp);
1.1 djm 3680: return ret;
3681: }
3682:
3683: void
3684: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3685: {
1.93 djm 3686: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3687:
3688: if (point == NULL) {
3689: fputs("point=(NULL)\n", stderr);
3690: return;
3691: }
1.93 djm 3692: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3693: fprintf(stderr, "%s: BN_new failed\n", __func__);
3694: goto out;
1.1 djm 3695: }
3696: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3697: NID_X9_62_prime_field) {
3698: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3699: goto out;
1.1 djm 3700: }
1.93 djm 3701: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3702: x, y, NULL) != 1) {
1.1 djm 3703: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3704: __func__);
1.93 djm 3705: goto out;
1.1 djm 3706: }
3707: fputs("x=", stderr);
3708: BN_print_fp(stderr, x);
3709: fputs("\ny=", stderr);
3710: BN_print_fp(stderr, y);
3711: fputs("\n", stderr);
1.93 djm 3712: out:
3713: BN_clear_free(x);
3714: BN_clear_free(y);
1.1 djm 3715: }
3716:
3717: void
3718: sshkey_dump_ec_key(const EC_KEY *key)
3719: {
3720: const BIGNUM *exponent;
3721:
3722: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3723: EC_KEY_get0_public_key(key));
3724: fputs("exponent=", stderr);
3725: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3726: fputs("(NULL)", stderr);
3727: else
3728: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3729: fputs("\n", stderr);
3730: }
3731: #endif /* WITH_OPENSSL */
3732:
3733: static int
1.76 djm 3734: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3735: const char *passphrase, const char *comment, const char *ciphername,
3736: int rounds)
3737: {
1.4 djm 3738: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3739: u_char salt[SALT_LEN];
1.4 djm 3740: char *b64 = NULL;
1.1 djm 3741: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3742: u_int check;
3743: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3744: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3745: const struct sshcipher *cipher;
3746: const char *kdfname = KDFNAME;
3747: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3748:
3749: if (rounds <= 0)
3750: rounds = DEFAULT_ROUNDS;
3751: if (passphrase == NULL || !strlen(passphrase)) {
3752: ciphername = "none";
3753: kdfname = "none";
3754: } else if (ciphername == NULL)
3755: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3756: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3757: r = SSH_ERR_INVALID_ARGUMENT;
3758: goto out;
3759: }
3760:
3761: if ((kdf = sshbuf_new()) == NULL ||
3762: (encoded = sshbuf_new()) == NULL ||
3763: (encrypted = sshbuf_new()) == NULL) {
3764: r = SSH_ERR_ALLOC_FAIL;
3765: goto out;
3766: }
3767: blocksize = cipher_blocksize(cipher);
3768: keylen = cipher_keylen(cipher);
3769: ivlen = cipher_ivlen(cipher);
3770: authlen = cipher_authlen(cipher);
3771: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3772: r = SSH_ERR_ALLOC_FAIL;
3773: goto out;
3774: }
3775: if (strcmp(kdfname, "bcrypt") == 0) {
3776: arc4random_buf(salt, SALT_LEN);
3777: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3778: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3779: r = SSH_ERR_INVALID_ARGUMENT;
3780: goto out;
3781: }
3782: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3783: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3784: goto out;
3785: } else if (strcmp(kdfname, "none") != 0) {
3786: /* Unsupported KDF type */
3787: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3788: goto out;
3789: }
3790: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3791: key + keylen, ivlen, 1)) != 0)
3792: goto out;
3793:
3794: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3795: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3796: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3797: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3798: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3799: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3800: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3801: goto out;
3802:
3803: /* set up the buffer that will be encrypted */
3804:
3805: /* Random check bytes */
3806: check = arc4random();
3807: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3808: (r = sshbuf_put_u32(encrypted, check)) != 0)
3809: goto out;
3810:
3811: /* append private key and comment*/
1.62 markus 3812: if ((r = sshkey_private_serialize_opt(prv, encrypted,
1.116 djm 3813: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3814: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3815: goto out;
3816:
3817: /* padding */
3818: i = 0;
3819: while (sshbuf_len(encrypted) % blocksize) {
3820: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3821: goto out;
3822: }
3823:
3824: /* length in destination buffer */
3825: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3826: goto out;
3827:
3828: /* encrypt */
3829: if ((r = sshbuf_reserve(encoded,
3830: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3831: goto out;
1.36 djm 3832: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3833: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3834: goto out;
3835:
1.81 djm 3836: sshbuf_reset(blob);
1.1 djm 3837:
1.81 djm 3838: /* assemble uuencoded key */
3839: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3840: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3841: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3842: goto out;
3843:
3844: /* success */
3845: r = 0;
3846:
3847: out:
3848: sshbuf_free(kdf);
3849: sshbuf_free(encoded);
3850: sshbuf_free(encrypted);
1.36 djm 3851: cipher_free(ciphercontext);
1.1 djm 3852: explicit_bzero(salt, sizeof(salt));
1.100 jsg 3853: if (key != NULL)
3854: freezero(key, keylen + ivlen);
1.121 djm 3855: if (pubkeyblob != NULL)
1.100 jsg 3856: freezero(pubkeyblob, pubkeylen);
1.121 djm 3857: if (b64 != NULL)
1.100 jsg 3858: freezero(b64, strlen(b64));
1.1 djm 3859: return r;
3860: }
3861:
3862: static int
1.103 djm 3863: private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
1.1 djm 3864: {
3865: const u_char *cp;
3866: size_t encoded_len;
1.103 djm 3867: int r;
3868: u_char last;
1.1 djm 3869: struct sshbuf *encoded = NULL, *decoded = NULL;
3870:
1.103 djm 3871: if (blob == NULL || decodedp == NULL)
3872: return SSH_ERR_INVALID_ARGUMENT;
3873:
3874: *decodedp = NULL;
1.1 djm 3875:
3876: if ((encoded = sshbuf_new()) == NULL ||
1.103 djm 3877: (decoded = sshbuf_new()) == NULL) {
1.1 djm 3878: r = SSH_ERR_ALLOC_FAIL;
3879: goto out;
3880: }
3881:
3882: /* check preamble */
3883: cp = sshbuf_ptr(blob);
3884: encoded_len = sshbuf_len(blob);
3885: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3886: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3887: r = SSH_ERR_INVALID_FORMAT;
3888: goto out;
3889: }
3890: cp += MARK_BEGIN_LEN;
3891: encoded_len -= MARK_BEGIN_LEN;
3892:
3893: /* Look for end marker, removing whitespace as we go */
3894: while (encoded_len > 0) {
3895: if (*cp != '\n' && *cp != '\r') {
3896: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3897: goto out;
3898: }
3899: last = *cp;
3900: encoded_len--;
3901: cp++;
3902: if (last == '\n') {
3903: if (encoded_len >= MARK_END_LEN &&
3904: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3905: /* \0 terminate */
3906: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3907: goto out;
3908: break;
3909: }
3910: }
3911: }
3912: if (encoded_len == 0) {
3913: r = SSH_ERR_INVALID_FORMAT;
3914: goto out;
3915: }
3916:
3917: /* decode base64 */
1.4 djm 3918: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3919: goto out;
3920:
3921: /* check magic */
3922: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3923: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3924: r = SSH_ERR_INVALID_FORMAT;
3925: goto out;
3926: }
1.103 djm 3927: /* success */
3928: *decodedp = decoded;
3929: decoded = NULL;
3930: r = 0;
3931: out:
3932: sshbuf_free(encoded);
3933: sshbuf_free(decoded);
3934: return r;
3935: }
3936:
3937: static int
1.104 djm 3938: private2_decrypt(struct sshbuf *decoded, const char *passphrase,
3939: struct sshbuf **decryptedp, struct sshkey **pubkeyp)
1.103 djm 3940: {
3941: char *ciphername = NULL, *kdfname = NULL;
3942: const struct sshcipher *cipher = NULL;
3943: int r = SSH_ERR_INTERNAL_ERROR;
3944: size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3945: struct sshbuf *kdf = NULL, *decrypted = NULL;
3946: struct sshcipher_ctx *ciphercontext = NULL;
1.104 djm 3947: struct sshkey *pubkey = NULL;
1.103 djm 3948: u_char *key = NULL, *salt = NULL, *dp;
3949: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3950:
1.104 djm 3951: if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
1.103 djm 3952: return SSH_ERR_INVALID_ARGUMENT;
3953:
3954: *decryptedp = NULL;
1.104 djm 3955: *pubkeyp = NULL;
1.103 djm 3956:
3957: if ((decrypted = sshbuf_new()) == NULL) {
3958: r = SSH_ERR_ALLOC_FAIL;
3959: goto out;
3960: }
3961:
1.1 djm 3962: /* parse public portion of key */
3963: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3964: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3965: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3966: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
1.103 djm 3967: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3968: goto out;
3969:
3970: if (nkeys != 1) {
3971: /* XXX only one key supported at present */
3972: r = SSH_ERR_INVALID_FORMAT;
3973: goto out;
3974: }
3975:
1.104 djm 3976: if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
1.1 djm 3977: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3978: goto out;
3979:
3980: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3981: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3982: goto out;
3983: }
3984: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3985: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3986: goto out;
3987: }
1.101 markus 3988: if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
1.1 djm 3989: r = SSH_ERR_INVALID_FORMAT;
1.101 markus 3990: goto out;
3991: }
3992: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3993: strcmp(kdfname, "none") != 0) {
3994: /* passphrase required */
3995: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 3996: goto out;
3997: }
3998:
3999: /* check size of encrypted key blob */
4000: blocksize = cipher_blocksize(cipher);
4001: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
4002: r = SSH_ERR_INVALID_FORMAT;
4003: goto out;
4004: }
4005:
4006: /* setup key */
4007: keylen = cipher_keylen(cipher);
4008: ivlen = cipher_ivlen(cipher);
1.18 djm 4009: authlen = cipher_authlen(cipher);
1.1 djm 4010: if ((key = calloc(1, keylen + ivlen)) == NULL) {
4011: r = SSH_ERR_ALLOC_FAIL;
4012: goto out;
4013: }
4014: if (strcmp(kdfname, "bcrypt") == 0) {
4015: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4016: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4017: goto out;
4018: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4019: key, keylen + ivlen, rounds) < 0) {
4020: r = SSH_ERR_INVALID_FORMAT;
4021: goto out;
4022: }
4023: }
4024:
1.18 djm 4025: /* check that an appropriate amount of auth data is present */
1.84 djm 4026: if (sshbuf_len(decoded) < authlen ||
4027: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4028: r = SSH_ERR_INVALID_FORMAT;
4029: goto out;
4030: }
4031:
1.1 djm 4032: /* decrypt private portion of key */
4033: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4034: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4035: key + keylen, ivlen, 0)) != 0)
4036: goto out;
1.36 djm 4037: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4038: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4039: /* an integrity error here indicates an incorrect passphrase */
4040: if (r == SSH_ERR_MAC_INVALID)
4041: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4042: goto out;
4043: }
1.18 djm 4044: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4045: goto out;
4046: /* there should be no trailing data */
4047: if (sshbuf_len(decoded) != 0) {
4048: r = SSH_ERR_INVALID_FORMAT;
4049: goto out;
4050: }
4051:
4052: /* check check bytes */
4053: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4054: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4055: goto out;
4056: if (check1 != check2) {
4057: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4058: goto out;
4059: }
1.103 djm 4060: /* success */
4061: *decryptedp = decrypted;
4062: decrypted = NULL;
1.104 djm 4063: *pubkeyp = pubkey;
4064: pubkey = NULL;
1.103 djm 4065: r = 0;
4066: out:
4067: cipher_free(ciphercontext);
4068: free(ciphername);
4069: free(kdfname);
1.104 djm 4070: sshkey_free(pubkey);
1.103 djm 4071: if (salt != NULL) {
4072: explicit_bzero(salt, slen);
4073: free(salt);
4074: }
4075: if (key != NULL) {
4076: explicit_bzero(key, keylen + ivlen);
4077: free(key);
4078: }
4079: sshbuf_free(kdf);
4080: sshbuf_free(decrypted);
4081: return r;
4082: }
4083:
4084: static int
4085: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
4086: struct sshkey **keyp, char **commentp)
4087: {
4088: char *comment = NULL;
4089: int r = SSH_ERR_INTERNAL_ERROR;
4090: struct sshbuf *decoded = NULL, *decrypted = NULL;
1.104 djm 4091: struct sshkey *k = NULL, *pubkey = NULL;
1.103 djm 4092:
4093: if (keyp != NULL)
4094: *keyp = NULL;
4095: if (commentp != NULL)
4096: *commentp = NULL;
4097:
4098: /* Undo base64 encoding and decrypt the private section */
4099: if ((r = private2_uudecode(blob, &decoded)) != 0 ||
1.104 djm 4100: (r = private2_decrypt(decoded, passphrase,
4101: &decrypted, &pubkey)) != 0)
1.103 djm 4102: goto out;
1.105 djm 4103:
4104: if (type != KEY_UNSPEC &&
4105: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
4106: r = SSH_ERR_KEY_TYPE_MISMATCH;
4107: goto out;
4108: }
1.103 djm 4109:
4110: /* Load the private key and comment */
4111: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4112: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4113: goto out;
4114:
4115: /* Check deterministic padding after private section */
4116: if ((r = private2_check_padding(decrypted)) != 0)
4117: goto out;
1.1 djm 4118:
1.104 djm 4119: /* Check that the public key in the envelope matches the private key */
4120: if (!sshkey_equal(pubkey, k)) {
4121: r = SSH_ERR_INVALID_FORMAT;
4122: goto out;
4123: }
1.1 djm 4124:
4125: /* success */
4126: r = 0;
4127: if (keyp != NULL) {
4128: *keyp = k;
4129: k = NULL;
4130: }
4131: if (commentp != NULL) {
4132: *commentp = comment;
4133: comment = NULL;
4134: }
4135: out:
4136: free(comment);
4137: sshbuf_free(decoded);
4138: sshbuf_free(decrypted);
4139: sshkey_free(k);
1.104 djm 4140: sshkey_free(pubkey);
1.1 djm 4141: return r;
4142: }
4143:
1.107 djm 4144: static int
4145: sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
4146: struct sshkey **keyp)
4147: {
4148: int r = SSH_ERR_INTERNAL_ERROR;
4149: struct sshbuf *decoded = NULL;
4150: struct sshkey *pubkey = NULL;
4151: u_int nkeys = 0;
4152:
4153: if (keyp != NULL)
4154: *keyp = NULL;
4155:
4156: if ((r = private2_uudecode(blob, &decoded)) != 0)
4157: goto out;
4158: /* parse public key from unencrypted envelope */
4159: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
4160: (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
4161: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
4162: (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
4163: (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
4164: goto out;
4165:
4166: if (nkeys != 1) {
4167: /* XXX only one key supported at present */
4168: r = SSH_ERR_INVALID_FORMAT;
4169: goto out;
4170: }
4171:
4172: /* Parse the public key */
4173: if ((r = sshkey_froms(decoded, &pubkey)) != 0)
4174: goto out;
4175:
4176: if (type != KEY_UNSPEC &&
4177: sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
4178: r = SSH_ERR_KEY_TYPE_MISMATCH;
4179: goto out;
4180: }
4181:
4182: /* success */
4183: r = 0;
4184: if (keyp != NULL) {
4185: *keyp = pubkey;
4186: pubkey = NULL;
4187: }
4188: out:
4189: sshbuf_free(decoded);
4190: sshkey_free(pubkey);
4191: return r;
4192: }
4193:
1.1 djm 4194: #ifdef WITH_OPENSSL
1.80 djm 4195: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4196: static int
1.80 djm 4197: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4198: int format, const char *_passphrase, const char *comment)
1.1 djm 4199: {
1.76 djm 4200: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4201: int success, r;
4202: int blen, len = strlen(_passphrase);
4203: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4204: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4205: char *bptr;
1.1 djm 4206: BIO *bio = NULL;
1.76 djm 4207: struct sshbuf *blob;
1.80 djm 4208: EVP_PKEY *pkey = NULL;
1.1 djm 4209:
4210: if (len > 0 && len <= 4)
4211: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4212: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4213: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4214: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4215: r = SSH_ERR_ALLOC_FAIL;
4216: goto out;
4217: }
4218: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4219: r = SSH_ERR_ALLOC_FAIL;
4220: goto out;
1.76 djm 4221: }
4222: if ((r = sshkey_unshield_private(key)) != 0)
4223: goto out;
1.1 djm 4224:
4225: switch (key->type) {
4226: case KEY_DSA:
1.80 djm 4227: if (format == SSHKEY_PRIVATE_PEM) {
4228: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4229: cipher, passphrase, len, NULL, NULL);
4230: } else {
4231: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4232: }
1.1 djm 4233: break;
4234: case KEY_ECDSA:
1.80 djm 4235: if (format == SSHKEY_PRIVATE_PEM) {
4236: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4237: cipher, passphrase, len, NULL, NULL);
4238: } else {
4239: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4240: }
1.1 djm 4241: break;
4242: case KEY_RSA:
1.80 djm 4243: if (format == SSHKEY_PRIVATE_PEM) {
4244: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4245: cipher, passphrase, len, NULL, NULL);
4246: } else {
4247: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4248: }
1.1 djm 4249: break;
4250: default:
4251: success = 0;
4252: break;
4253: }
4254: if (success == 0) {
4255: r = SSH_ERR_LIBCRYPTO_ERROR;
4256: goto out;
4257: }
1.80 djm 4258: if (format == SSHKEY_PRIVATE_PKCS8) {
4259: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4260: passphrase, len, NULL, NULL)) == 0) {
4261: r = SSH_ERR_LIBCRYPTO_ERROR;
4262: goto out;
4263: }
4264: }
1.1 djm 4265: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4266: r = SSH_ERR_INTERNAL_ERROR;
4267: goto out;
4268: }
4269: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4270: goto out;
4271: r = 0;
4272: out:
1.76 djm 4273: if (was_shielded)
4274: r = sshkey_shield_private(key);
4275: if (r == 0)
4276: r = sshbuf_putb(buf, blob);
1.80 djm 4277:
4278: EVP_PKEY_free(pkey);
1.76 djm 4279: sshbuf_free(blob);
1.1 djm 4280: BIO_free(bio);
4281: return r;
4282: }
4283: #endif /* WITH_OPENSSL */
4284:
4285: /* Serialise "key" to buffer "blob" */
4286: int
4287: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4288: const char *passphrase, const char *comment,
1.80 djm 4289: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4290: {
4291: switch (key->type) {
1.9 markus 4292: #ifdef WITH_OPENSSL
1.1 djm 4293: case KEY_DSA:
4294: case KEY_ECDSA:
4295: case KEY_RSA:
1.80 djm 4296: break; /* see below */
1.1 djm 4297: #endif /* WITH_OPENSSL */
4298: case KEY_ED25519:
1.90 markus 4299: case KEY_ED25519_SK:
1.62 markus 4300: #ifdef WITH_XMSS
4301: case KEY_XMSS:
4302: #endif /* WITH_XMSS */
1.85 djm 4303: #ifdef WITH_OPENSSL
4304: case KEY_ECDSA_SK:
4305: #endif /* WITH_OPENSSL */
1.1 djm 4306: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4307: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4308: default:
4309: return SSH_ERR_KEY_TYPE_UNKNOWN;
4310: }
1.80 djm 4311:
4312: #ifdef WITH_OPENSSL
4313: switch (format) {
4314: case SSHKEY_PRIVATE_OPENSSH:
4315: return sshkey_private_to_blob2(key, blob, passphrase,
4316: comment, openssh_format_cipher, openssh_format_rounds);
4317: case SSHKEY_PRIVATE_PEM:
4318: case SSHKEY_PRIVATE_PKCS8:
4319: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4320: format, passphrase, comment);
4321: default:
4322: return SSH_ERR_INVALID_ARGUMENT;
4323: }
4324: #endif /* WITH_OPENSSL */
1.1 djm 4325: }
4326:
4327: #ifdef WITH_OPENSSL
1.8 djm 4328: static int
1.52 djm 4329: translate_libcrypto_error(unsigned long pem_err)
4330: {
4331: int pem_reason = ERR_GET_REASON(pem_err);
4332:
4333: switch (ERR_GET_LIB(pem_err)) {
4334: case ERR_LIB_PEM:
4335: switch (pem_reason) {
4336: case PEM_R_BAD_PASSWORD_READ:
4337: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4338: case PEM_R_BAD_DECRYPT:
4339: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4340: default:
4341: return SSH_ERR_INVALID_FORMAT;
4342: }
4343: case ERR_LIB_EVP:
4344: switch (pem_reason) {
4345: case EVP_R_BAD_DECRYPT:
4346: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4347: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4348: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4349: #endif
1.52 djm 4350: case EVP_R_DECODE_ERROR:
4351: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4352: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4353: #endif
4354: return SSH_ERR_INVALID_FORMAT;
4355: default:
4356: return SSH_ERR_LIBCRYPTO_ERROR;
4357: }
4358: case ERR_LIB_ASN1:
4359: return SSH_ERR_INVALID_FORMAT;
4360: }
4361: return SSH_ERR_LIBCRYPTO_ERROR;
4362: }
4363:
4364: static void
4365: clear_libcrypto_errors(void)
4366: {
4367: while (ERR_get_error() != 0)
4368: ;
4369: }
4370:
4371: /*
4372: * Translate OpenSSL error codes to determine whether
4373: * passphrase is required/incorrect.
4374: */
4375: static int
4376: convert_libcrypto_error(void)
4377: {
4378: /*
4379: * Some password errors are reported at the beginning
4380: * of the error queue.
4381: */
4382: if (translate_libcrypto_error(ERR_peek_error()) ==
4383: SSH_ERR_KEY_WRONG_PASSPHRASE)
4384: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4385: return translate_libcrypto_error(ERR_peek_last_error());
4386: }
4387:
4388: static int
1.1 djm 4389: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4390: const char *passphrase, struct sshkey **keyp)
1.1 djm 4391: {
4392: EVP_PKEY *pk = NULL;
4393: struct sshkey *prv = NULL;
4394: BIO *bio = NULL;
4395: int r;
4396:
1.32 djm 4397: if (keyp != NULL)
4398: *keyp = NULL;
1.1 djm 4399:
4400: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4401: return SSH_ERR_ALLOC_FAIL;
4402: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4403: (int)sshbuf_len(blob)) {
4404: r = SSH_ERR_ALLOC_FAIL;
4405: goto out;
4406: }
4407:
1.52 djm 4408: clear_libcrypto_errors();
1.1 djm 4409: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4410: (char *)passphrase)) == NULL) {
1.116 djm 4411: /*
4412: * libcrypto may return various ASN.1 errors when attempting
4413: * to parse a key with an incorrect passphrase.
4414: * Treat all format errors as "incorrect passphrase" if a
4415: * passphrase was supplied.
4416: */
1.71 djm 4417: if (passphrase != NULL && *passphrase != '\0')
4418: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4419: else
4420: r = convert_libcrypto_error();
1.1 djm 4421: goto out;
4422: }
1.69 djm 4423: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4424: (type == KEY_UNSPEC || type == KEY_RSA)) {
4425: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4426: r = SSH_ERR_ALLOC_FAIL;
4427: goto out;
4428: }
4429: prv->rsa = EVP_PKEY_get1_RSA(pk);
4430: prv->type = KEY_RSA;
4431: #ifdef DEBUG_PK
4432: RSA_print_fp(stderr, prv->rsa, 8);
4433: #endif
4434: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4435: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4436: goto out;
4437: }
1.122 djm 4438: if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
1.1 djm 4439: goto out;
1.69 djm 4440: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4441: (type == KEY_UNSPEC || type == KEY_DSA)) {
4442: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4443: r = SSH_ERR_ALLOC_FAIL;
4444: goto out;
4445: }
4446: prv->dsa = EVP_PKEY_get1_DSA(pk);
4447: prv->type = KEY_DSA;
4448: #ifdef DEBUG_PK
4449: DSA_print_fp(stderr, prv->dsa, 8);
4450: #endif
1.69 djm 4451: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4452: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4453: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4454: r = SSH_ERR_ALLOC_FAIL;
4455: goto out;
4456: }
4457: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4458: prv->type = KEY_ECDSA;
4459: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4460: if (prv->ecdsa_nid == -1 ||
4461: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4462: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4463: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4464: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4465: r = SSH_ERR_INVALID_FORMAT;
4466: goto out;
4467: }
4468: #ifdef DEBUG_PK
4469: if (prv != NULL && prv->ecdsa != NULL)
4470: sshkey_dump_ec_key(prv->ecdsa);
4471: #endif
4472: } else {
4473: r = SSH_ERR_INVALID_FORMAT;
4474: goto out;
4475: }
4476: r = 0;
1.32 djm 4477: if (keyp != NULL) {
4478: *keyp = prv;
4479: prv = NULL;
4480: }
1.1 djm 4481: out:
4482: BIO_free(bio);
1.60 jsing 4483: EVP_PKEY_free(pk);
1.30 mmcc 4484: sshkey_free(prv);
1.1 djm 4485: return r;
4486: }
4487: #endif /* WITH_OPENSSL */
4488:
4489: int
4490: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4491: const char *passphrase, struct sshkey **keyp, char **commentp)
4492: {
1.42 djm 4493: int r = SSH_ERR_INTERNAL_ERROR;
4494:
1.32 djm 4495: if (keyp != NULL)
4496: *keyp = NULL;
1.1 djm 4497: if (commentp != NULL)
4498: *commentp = NULL;
4499:
4500: switch (type) {
4501: case KEY_ED25519:
1.62 markus 4502: case KEY_XMSS:
1.106 djm 4503: /* No fallback for new-format-only keys */
1.1 djm 4504: return sshkey_parse_private2(blob, type, passphrase,
4505: keyp, commentp);
1.106 djm 4506: default:
1.42 djm 4507: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4508: commentp);
1.106 djm 4509: /* Only fallback to PEM parser if a format error occurred. */
4510: if (r != SSH_ERR_INVALID_FORMAT)
1.42 djm 4511: return r;
1.1 djm 4512: #ifdef WITH_OPENSSL
1.8 djm 4513: return sshkey_parse_private_pem_fileblob(blob, type,
4514: passphrase, keyp);
1.1 djm 4515: #else
4516: return SSH_ERR_INVALID_FORMAT;
4517: #endif /* WITH_OPENSSL */
4518: }
4519: }
4520:
4521: int
4522: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4523: struct sshkey **keyp, char **commentp)
1.1 djm 4524: {
4525: if (keyp != NULL)
4526: *keyp = NULL;
4527: if (commentp != NULL)
4528: *commentp = NULL;
4529:
1.23 tim 4530: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4531: passphrase, keyp, commentp);
1.96 djm 4532: }
4533:
4534: void
4535: sshkey_sig_details_free(struct sshkey_sig_details *details)
4536: {
4537: freezero(details, sizeof(*details));
1.107 djm 4538: }
4539:
4540: int
4541: sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
4542: struct sshkey **pubkeyp)
4543: {
4544: int r = SSH_ERR_INTERNAL_ERROR;
4545:
4546: if (pubkeyp != NULL)
4547: *pubkeyp = NULL;
4548: /* only new-format private keys bundle a public key inside */
4549: if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
4550: return r;
4551: return 0;
1.1 djm 4552: }
1.62 markus 4553:
4554: #ifdef WITH_XMSS
4555: /*
4556: * serialize the key with the current state and forward the state
4557: * maxsign times.
4558: */
4559: int
1.77 djm 4560: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 4561: u_int32_t maxsign, int printerror)
1.62 markus 4562: {
4563: int r, rupdate;
4564:
4565: if (maxsign == 0 ||
4566: sshkey_type_plain(k->type) != KEY_XMSS)
4567: return sshkey_private_serialize_opt(k, b,
4568: SSHKEY_SERIALIZE_DEFAULT);
1.112 dtucker 4569: if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
1.62 markus 4570: (r = sshkey_private_serialize_opt(k, b,
4571: SSHKEY_SERIALIZE_STATE)) != 0 ||
4572: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4573: goto out;
4574: r = 0;
4575: out:
1.112 dtucker 4576: if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
1.62 markus 4577: if (r == 0)
4578: r = rupdate;
4579: }
4580: return r;
4581: }
4582:
4583: u_int32_t
4584: sshkey_signatures_left(const struct sshkey *k)
4585: {
4586: if (sshkey_type_plain(k->type) == KEY_XMSS)
4587: return sshkey_xmss_signatures_left(k);
4588: return 0;
4589: }
4590:
4591: int
4592: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4593: {
4594: if (sshkey_type_plain(k->type) != KEY_XMSS)
4595: return SSH_ERR_INVALID_ARGUMENT;
4596: return sshkey_xmss_enable_maxsign(k, maxsign);
4597: }
4598:
4599: int
4600: sshkey_set_filename(struct sshkey *k, const char *filename)
4601: {
4602: if (k == NULL)
4603: return SSH_ERR_INVALID_ARGUMENT;
4604: if (sshkey_type_plain(k->type) != KEY_XMSS)
4605: return 0;
4606: if (filename == NULL)
4607: return SSH_ERR_INVALID_ARGUMENT;
4608: if ((k->xmss_filename = strdup(filename)) == NULL)
4609: return SSH_ERR_ALLOC_FAIL;
4610: return 0;
4611: }
4612: #else
4613: int
1.76 djm 4614: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.112 dtucker 4615: u_int32_t maxsign, int printerror)
1.62 markus 4616: {
4617: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4618: }
4619:
4620: u_int32_t
4621: sshkey_signatures_left(const struct sshkey *k)
4622: {
4623: return 0;
4624: }
4625:
4626: int
4627: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4628: {
4629: return SSH_ERR_INVALID_ARGUMENT;
4630: }
4631:
4632: int
4633: sshkey_set_filename(struct sshkey *k, const char *filename)
4634: {
4635: if (k == NULL)
4636: return SSH_ERR_INVALID_ARGUMENT;
4637: return 0;
4638: }
4639: #endif /* WITH_XMSS */
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