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fix old typo (s/SYSVINITSTOPT/SYSVINITSTOP/)
[openssh.git] / sshkey.c
blobab80752b8d0bd7b3b73f68a6dc9a59daa1e949dc
1 /* $OpenBSD: sshkey.c,v 1.148 2024/12/03 15:53:51 tb Exp $ */
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 "includes.h"
29
30 #include <sys/types.h>
31 #include <sys/mman.h>
32 #include <netinet/in.h>
33
34 #ifdef WITH_OPENSSL
35 #include <openssl/evp.h>
36 #include <openssl/err.h>
37 #include <openssl/pem.h>
38 #endif
39
40 #include "crypto_api.h"
41
42 #include <errno.h>
43 #include <limits.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <resolv.h>
48 #include <time.h>
49 #ifdef HAVE_UTIL_H
50 #include <util.h>
51 #endif /* HAVE_UTIL_H */
52
53 #include "ssh2.h"
54 #include "ssherr.h"
55 #include "misc.h"
56 #include "sshbuf.h"
57 #include "cipher.h"
58 #include "digest.h"
59 #define SSHKEY_INTERNAL
60 #include "sshkey.h"
61 #include "match.h"
62 #include "ssh-sk.h"
63
64 #ifdef WITH_XMSS
65 #include "sshkey-xmss.h"
66 #include "xmss_fast.h"
67 #endif
68
69 #include "openbsd-compat/openssl-compat.h"
70
71 /* openssh private key file format */
72 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
73 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
74 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
75 #define MARK_END_LEN (sizeof(MARK_END) - 1)
76 #define KDFNAME "bcrypt"
77 #define AUTH_MAGIC "openssh-key-v1"
78 #define SALT_LEN 16
79 #define DEFAULT_CIPHERNAME "aes256-ctr"
80 #define DEFAULT_ROUNDS 24
81
82 /*
83 * Constants relating to "shielding" support; protection of keys expected
84 * to remain in memory for long durations
85 */
86 #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024)
87 #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */
88 #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512
89
90 int sshkey_private_serialize_opt(struct sshkey *key,
91 struct sshbuf *buf, enum sshkey_serialize_rep);
92 static int sshkey_from_blob_internal(struct sshbuf *buf,
93 struct sshkey **keyp, int allow_cert);
94
95 /* Supported key types */
96 extern const struct sshkey_impl sshkey_ed25519_impl;
97 extern const struct sshkey_impl sshkey_ed25519_cert_impl;
98 extern const struct sshkey_impl sshkey_ed25519_sk_impl;
99 extern const struct sshkey_impl sshkey_ed25519_sk_cert_impl;
100 #ifdef WITH_OPENSSL
101 # ifdef OPENSSL_HAS_ECC
102 # ifdef ENABLE_SK
103 extern const struct sshkey_impl sshkey_ecdsa_sk_impl;
104 extern const struct sshkey_impl sshkey_ecdsa_sk_cert_impl;
105 extern const struct sshkey_impl sshkey_ecdsa_sk_webauthn_impl;
106 # endif /* ENABLE_SK */
107 extern const struct sshkey_impl sshkey_ecdsa_nistp256_impl;
108 extern const struct sshkey_impl sshkey_ecdsa_nistp256_cert_impl;
109 extern const struct sshkey_impl sshkey_ecdsa_nistp384_impl;
110 extern const struct sshkey_impl sshkey_ecdsa_nistp384_cert_impl;
111 # ifdef OPENSSL_HAS_NISTP521
112 extern const struct sshkey_impl sshkey_ecdsa_nistp521_impl;
113 extern const struct sshkey_impl sshkey_ecdsa_nistp521_cert_impl;
114 # endif /* OPENSSL_HAS_NISTP521 */
115 # endif /* OPENSSL_HAS_ECC */
116 extern const struct sshkey_impl sshkey_rsa_impl;
117 extern const struct sshkey_impl sshkey_rsa_cert_impl;
118 extern const struct sshkey_impl sshkey_rsa_sha256_impl;
119 extern const struct sshkey_impl sshkey_rsa_sha256_cert_impl;
120 extern const struct sshkey_impl sshkey_rsa_sha512_impl;
121 extern const struct sshkey_impl sshkey_rsa_sha512_cert_impl;
122 # ifdef WITH_DSA
123 extern const struct sshkey_impl sshkey_dss_impl;
124 extern const struct sshkey_impl sshkey_dsa_cert_impl;
125 # endif
126 #endif /* WITH_OPENSSL */
127 #ifdef WITH_XMSS
128 extern const struct sshkey_impl sshkey_xmss_impl;
129 extern const struct sshkey_impl sshkey_xmss_cert_impl;
130 #endif
131
132 const struct sshkey_impl * const keyimpls[] = {
133 &sshkey_ed25519_impl,
134 &sshkey_ed25519_cert_impl,
135 #ifdef ENABLE_SK
136 &sshkey_ed25519_sk_impl,
137 &sshkey_ed25519_sk_cert_impl,
138 #endif
139 #ifdef WITH_OPENSSL
140 # ifdef OPENSSL_HAS_ECC
141 &sshkey_ecdsa_nistp256_impl,
142 &sshkey_ecdsa_nistp256_cert_impl,
143 &sshkey_ecdsa_nistp384_impl,
144 &sshkey_ecdsa_nistp384_cert_impl,
145 # ifdef OPENSSL_HAS_NISTP521
146 &sshkey_ecdsa_nistp521_impl,
147 &sshkey_ecdsa_nistp521_cert_impl,
148 # endif /* OPENSSL_HAS_NISTP521 */
149 # ifdef ENABLE_SK
150 &sshkey_ecdsa_sk_impl,
151 &sshkey_ecdsa_sk_cert_impl,
152 &sshkey_ecdsa_sk_webauthn_impl,
153 # endif /* ENABLE_SK */
154 # endif /* OPENSSL_HAS_ECC */
155 # ifdef WITH_DSA
156 &sshkey_dss_impl,
157 &sshkey_dsa_cert_impl,
158 # endif
159 &sshkey_rsa_impl,
160 &sshkey_rsa_cert_impl,
161 &sshkey_rsa_sha256_impl,
162 &sshkey_rsa_sha256_cert_impl,
163 &sshkey_rsa_sha512_impl,
164 &sshkey_rsa_sha512_cert_impl,
165 #endif /* WITH_OPENSSL */
166 #ifdef WITH_XMSS
167 &sshkey_xmss_impl,
168 &sshkey_xmss_cert_impl,
169 #endif
170 NULL
171 };
172
173 static const struct sshkey_impl *
174 sshkey_impl_from_type(int type)
175 {
176 int i;
177
178 for (i = 0; keyimpls[i] != NULL; i++) {
179 if (keyimpls[i]->type == type)
180 return keyimpls[i];
181 }
182 return NULL;
183 }
184
185 static const struct sshkey_impl *
186 sshkey_impl_from_type_nid(int type, int nid)
187 {
188 int i;
189
190 for (i = 0; keyimpls[i] != NULL; i++) {
191 if (keyimpls[i]->type == type &&
192 (keyimpls[i]->nid == 0 || keyimpls[i]->nid == nid))
193 return keyimpls[i];
194 }
195 return NULL;
196 }
197
198 static const struct sshkey_impl *
199 sshkey_impl_from_key(const struct sshkey *k)
200 {
201 if (k == NULL)
202 return NULL;
203 return sshkey_impl_from_type_nid(k->type, k->ecdsa_nid);
204 }
205
206 const char *
207 sshkey_type(const struct sshkey *k)
208 {
209 const struct sshkey_impl *impl;
210
211 if ((impl = sshkey_impl_from_key(k)) == NULL)
212 return "unknown";
213 return impl->shortname;
214 }
215
216 static const char *
217 sshkey_ssh_name_from_type_nid(int type, int nid)
218 {
219 const struct sshkey_impl *impl;
220
221 if ((impl = sshkey_impl_from_type_nid(type, nid)) == NULL)
222 return "ssh-unknown";
223 return impl->name;
224 }
225
226 int
227 sshkey_type_is_cert(int type)
228 {
229 const struct sshkey_impl *impl;
230
231 if ((impl = sshkey_impl_from_type(type)) == NULL)
232 return 0;
233 return impl->cert;
234 }
235
236 const char *
237 sshkey_ssh_name(const struct sshkey *k)
238 {
239 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
240 }
241
242 const char *
243 sshkey_ssh_name_plain(const struct sshkey *k)
244 {
245 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
246 k->ecdsa_nid);
247 }
248
249 static int
250 type_from_name(const char *name, int allow_short)
251 {
252 int i;
253 const struct sshkey_impl *impl;
254
255 for (i = 0; keyimpls[i] != NULL; i++) {
256 impl = keyimpls[i];
257 if (impl->name != NULL && strcmp(name, impl->name) == 0)
258 return impl->type;
259 /* Only allow shortname matches for plain key types */
260 if (allow_short && !impl->cert && impl->shortname != NULL &&
261 strcasecmp(impl->shortname, name) == 0)
262 return impl->type;
263 }
264 return KEY_UNSPEC;
265 }
266
267 int
268 sshkey_type_from_name(const char *name)
269 {
270 return type_from_name(name, 0);
271 }
272
273 int
274 sshkey_type_from_shortname(const char *name)
275 {
276 return type_from_name(name, 1);
277 }
278
279 static int
280 key_type_is_ecdsa_variant(int type)
281 {
282 switch (type) {
283 case KEY_ECDSA:
284 case KEY_ECDSA_CERT:
285 case KEY_ECDSA_SK:
286 case KEY_ECDSA_SK_CERT:
287 return 1;
288 }
289 return 0;
290 }
291
292 int
293 sshkey_ecdsa_nid_from_name(const char *name)
294 {
295 int i;
296
297 for (i = 0; keyimpls[i] != NULL; i++) {
298 if (!key_type_is_ecdsa_variant(keyimpls[i]->type))
299 continue;
300 if (keyimpls[i]->name != NULL &&
301 strcmp(name, keyimpls[i]->name) == 0)
302 return keyimpls[i]->nid;
303 }
304 return -1;
305 }
306
307 int
308 sshkey_match_keyname_to_sigalgs(const char *keyname, const char *sigalgs)
309 {
310 int ktype;
311
312 if (sigalgs == NULL || *sigalgs == '\0' ||
313 (ktype = sshkey_type_from_name(keyname)) == KEY_UNSPEC)
314 return 0;
315 else if (ktype == KEY_RSA) {
316 return match_pattern_list("ssh-rsa", sigalgs, 0) == 1 ||
317 match_pattern_list("rsa-sha2-256", sigalgs, 0) == 1 ||
318 match_pattern_list("rsa-sha2-512", sigalgs, 0) == 1;
319 } else if (ktype == KEY_RSA_CERT) {
320 return match_pattern_list("ssh-rsa-cert-v01@openssh.com",
321 sigalgs, 0) == 1 ||
322 match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
323 sigalgs, 0) == 1 ||
324 match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
325 sigalgs, 0) == 1;
326 } else
327 return match_pattern_list(keyname, sigalgs, 0) == 1;
328 }
329
330 char *
331 sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
332 {
333 char *tmp, *ret = NULL;
334 size_t i, nlen, rlen = 0;
335 const struct sshkey_impl *impl;
336
337 for (i = 0; keyimpls[i] != NULL; i++) {
338 impl = keyimpls[i];
339 if (impl->name == NULL)
340 continue;
341 if (!include_sigonly && impl->sigonly)
342 continue;
343 if ((certs_only && !impl->cert) || (plain_only && impl->cert))
344 continue;
345 if (ret != NULL)
346 ret[rlen++] = sep;
347 nlen = strlen(impl->name);
348 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
349 free(ret);
350 return NULL;
351 }
352 ret = tmp;
353 memcpy(ret + rlen, impl->name, nlen + 1);
354 rlen += nlen;
355 }
356 return ret;
357 }
358
359 int
360 sshkey_names_valid2(const char *names, int allow_wildcard, int plain_only)
361 {
362 char *s, *cp, *p;
363 const struct sshkey_impl *impl;
364 int i, type;
365
366 if (names == NULL || strcmp(names, "") == 0)
367 return 0;
368 if ((s = cp = strdup(names)) == NULL)
369 return 0;
370 for ((p = strsep(&cp, ",")); p && *p != '\0';
371 (p = strsep(&cp, ","))) {
372 type = sshkey_type_from_name(p);
373 if (type == KEY_UNSPEC) {
374 if (allow_wildcard) {
375 /*
376 * Try matching key types against the string.
377 * If any has a positive or negative match then
378 * the component is accepted.
379 */
380 impl = NULL;
381 for (i = 0; keyimpls[i] != NULL; i++) {
382 if (match_pattern_list(
383 keyimpls[i]->name, p, 0) != 0) {
384 impl = keyimpls[i];
385 break;
386 }
387 }
388 if (impl != NULL)
389 continue;
390 }
391 free(s);
392 return 0;
393 } else if (plain_only && sshkey_type_is_cert(type)) {
394 free(s);
395 return 0;
396 }
397 }
398 free(s);
399 return 1;
400 }
401
402 u_int
403 sshkey_size(const struct sshkey *k)
404 {
405 const struct sshkey_impl *impl;
406
407 if ((impl = sshkey_impl_from_key(k)) == NULL)
408 return 0;
409 if (impl->funcs->size != NULL)
410 return impl->funcs->size(k);
411 return impl->keybits;
412 }
413
414 static int
415 sshkey_type_is_valid_ca(int type)
416 {
417 const struct sshkey_impl *impl;
418
419 if ((impl = sshkey_impl_from_type(type)) == NULL)
420 return 0;
421 /* All non-certificate types may act as CAs */
422 return !impl->cert;
423 }
424
425 int
426 sshkey_is_cert(const struct sshkey *k)
427 {
428 if (k == NULL)
429 return 0;
430 return sshkey_type_is_cert(k->type);
431 }
432
433 int
434 sshkey_is_sk(const struct sshkey *k)
435 {
436 if (k == NULL)
437 return 0;
438 switch (sshkey_type_plain(k->type)) {
439 case KEY_ECDSA_SK:
440 case KEY_ED25519_SK:
441 return 1;
442 default:
443 return 0;
444 }
445 }
446
447 /* Return the cert-less equivalent to a certified key type */
448 int
449 sshkey_type_plain(int type)
450 {
451 switch (type) {
452 case KEY_RSA_CERT:
453 return KEY_RSA;
454 case KEY_DSA_CERT:
455 return KEY_DSA;
456 case KEY_ECDSA_CERT:
457 return KEY_ECDSA;
458 case KEY_ECDSA_SK_CERT:
459 return KEY_ECDSA_SK;
460 case KEY_ED25519_CERT:
461 return KEY_ED25519;
462 case KEY_ED25519_SK_CERT:
463 return KEY_ED25519_SK;
464 case KEY_XMSS_CERT:
465 return KEY_XMSS;
466 default:
467 return type;
468 }
469 }
470
471 /* Return the cert equivalent to a plain key type */
472 static int
473 sshkey_type_certified(int type)
474 {
475 switch (type) {
476 case KEY_RSA:
477 return KEY_RSA_CERT;
478 case KEY_DSA:
479 return KEY_DSA_CERT;
480 case KEY_ECDSA:
481 return KEY_ECDSA_CERT;
482 case KEY_ECDSA_SK:
483 return KEY_ECDSA_SK_CERT;
484 case KEY_ED25519:
485 return KEY_ED25519_CERT;
486 case KEY_ED25519_SK:
487 return KEY_ED25519_SK_CERT;
488 case KEY_XMSS:
489 return KEY_XMSS_CERT;
490 default:
491 return -1;
492 }
493 }
494
495 #ifdef WITH_OPENSSL
496 static const EVP_MD *
497 ssh_digest_to_md(int hash_alg)
498 {
499 switch (hash_alg) {
500 case SSH_DIGEST_SHA1:
501 return EVP_sha1();
502 case SSH_DIGEST_SHA256:
503 return EVP_sha256();
504 case SSH_DIGEST_SHA384:
505 return EVP_sha384();
506 case SSH_DIGEST_SHA512:
507 return EVP_sha512();
508 }
509 return NULL;
510 }
511
512 int
513 sshkey_pkey_digest_sign(EVP_PKEY *pkey, int hash_alg, u_char **sigp,
514 size_t *lenp, const u_char *data, size_t datalen)
515 {
516 EVP_MD_CTX *ctx = NULL;
517 u_char *sig = NULL;
518 int ret;
519 size_t slen;
520 const EVP_MD *evpmd;
521
522 *sigp = NULL;
523 *lenp = 0;
524
525 slen = EVP_PKEY_size(pkey);
526 if (slen <= 0 || slen > SSHBUF_MAX_BIGNUM ||
527 (evpmd = ssh_digest_to_md(hash_alg)) == NULL)
528 return SSH_ERR_INVALID_ARGUMENT;
529
530 if ((sig = malloc(slen)) == NULL)
531 return SSH_ERR_ALLOC_FAIL;
532
533 if ((ctx = EVP_MD_CTX_new()) == NULL) {
534 ret = SSH_ERR_ALLOC_FAIL;
535 goto out;
536 }
537 if (EVP_DigestSignInit(ctx, NULL, evpmd, NULL, pkey) != 1 ||
538 EVP_DigestSign(ctx, sig, &slen, data, datalen) != 1) {
539 ret = SSH_ERR_LIBCRYPTO_ERROR;
540 goto out;
541 }
542
543 *sigp = sig;
544 *lenp = slen;
545 /* Now owned by the caller */
546 sig = NULL;
547 ret = 0;
548
549 out:
550 EVP_MD_CTX_free(ctx);
551 free(sig);
552 return ret;
553 }
554
555 int
556 sshkey_pkey_digest_verify(EVP_PKEY *pkey, int hash_alg, const u_char *data,
557 size_t datalen, u_char *sigbuf, size_t siglen)
558 {
559 EVP_MD_CTX *ctx = NULL;
560 int ret = SSH_ERR_INTERNAL_ERROR;
561 const EVP_MD *evpmd;
562
563 if ((evpmd = ssh_digest_to_md(hash_alg)) == NULL)
564 return SSH_ERR_INVALID_ARGUMENT;
565 if ((ctx = EVP_MD_CTX_new()) == NULL)
566 return SSH_ERR_ALLOC_FAIL;
567 if (EVP_DigestVerifyInit(ctx, NULL, evpmd, NULL, pkey) != 1) {
568 ret = SSH_ERR_LIBCRYPTO_ERROR;
569 goto out;
570 }
571 switch (EVP_DigestVerify(ctx, sigbuf, siglen, data, datalen)) {
572 case 1:
573 ret = 0;
574 break;
575 case 0:
576 ret = SSH_ERR_SIGNATURE_INVALID;
577 break;
578 default:
579 ret = SSH_ERR_LIBCRYPTO_ERROR;
580 break;
581 }
582
583 out:
584 EVP_MD_CTX_free(ctx);
585 return ret;
586 }
587
588 /* XXX: these are really begging for a table-driven approach */
589 int
590 sshkey_curve_name_to_nid(const char *name)
591 {
592 if (strcmp(name, "nistp256") == 0)
593 return NID_X9_62_prime256v1;
594 else if (strcmp(name, "nistp384") == 0)
595 return NID_secp384r1;
596 # ifdef OPENSSL_HAS_NISTP521
597 else if (strcmp(name, "nistp521") == 0)
598 return NID_secp521r1;
599 # endif /* OPENSSL_HAS_NISTP521 */
600 else
601 return -1;
602 }
603
604 u_int
605 sshkey_curve_nid_to_bits(int nid)
606 {
607 switch (nid) {
608 case NID_X9_62_prime256v1:
609 return 256;
610 case NID_secp384r1:
611 return 384;
612 # ifdef OPENSSL_HAS_NISTP521
613 case NID_secp521r1:
614 return 521;
615 # endif /* OPENSSL_HAS_NISTP521 */
616 default:
617 return 0;
618 }
619 }
620
621 int
622 sshkey_ecdsa_bits_to_nid(int bits)
623 {
624 switch (bits) {
625 case 256:
626 return NID_X9_62_prime256v1;
627 case 384:
628 return NID_secp384r1;
629 # ifdef OPENSSL_HAS_NISTP521
630 case 521:
631 return NID_secp521r1;
632 # endif /* OPENSSL_HAS_NISTP521 */
633 default:
634 return -1;
635 }
636 }
637
638 const char *
639 sshkey_curve_nid_to_name(int nid)
640 {
641 switch (nid) {
642 case NID_X9_62_prime256v1:
643 return "nistp256";
644 case NID_secp384r1:
645 return "nistp384";
646 # ifdef OPENSSL_HAS_NISTP521
647 case NID_secp521r1:
648 return "nistp521";
649 # endif /* OPENSSL_HAS_NISTP521 */
650 default:
651 return NULL;
652 }
653 }
654
655 int
656 sshkey_ec_nid_to_hash_alg(int nid)
657 {
658 int kbits = sshkey_curve_nid_to_bits(nid);
659
660 if (kbits <= 0)
661 return -1;
662
663 /* RFC5656 section 6.2.1 */
664 if (kbits <= 256)
665 return SSH_DIGEST_SHA256;
666 else if (kbits <= 384)
667 return SSH_DIGEST_SHA384;
668 else
669 return SSH_DIGEST_SHA512;
670 }
671 #endif /* WITH_OPENSSL */
672
673 static void
674 cert_free(struct sshkey_cert *cert)
675 {
676 u_int i;
677
678 if (cert == NULL)
679 return;
680 sshbuf_free(cert->certblob);
681 sshbuf_free(cert->critical);
682 sshbuf_free(cert->extensions);
683 free(cert->key_id);
684 for (i = 0; i < cert->nprincipals; i++)
685 free(cert->principals[i]);
686 free(cert->principals);
687 sshkey_free(cert->signature_key);
688 free(cert->signature_type);
689 freezero(cert, sizeof(*cert));
690 }
691
692 static struct sshkey_cert *
693 cert_new(void)
694 {
695 struct sshkey_cert *cert;
696
697 if ((cert = calloc(1, sizeof(*cert))) == NULL)
698 return NULL;
699 if ((cert->certblob = sshbuf_new()) == NULL ||
700 (cert->critical = sshbuf_new()) == NULL ||
701 (cert->extensions = sshbuf_new()) == NULL) {
702 cert_free(cert);
703 return NULL;
704 }
705 cert->key_id = NULL;
706 cert->principals = NULL;
707 cert->signature_key = NULL;
708 cert->signature_type = NULL;
709 return cert;
710 }
711
712 struct sshkey *
713 sshkey_new(int type)
714 {
715 struct sshkey *k;
716 const struct sshkey_impl *impl = NULL;
717
718 if (type != KEY_UNSPEC &&
719 (impl = sshkey_impl_from_type(type)) == NULL)
720 return NULL;
721
722 /* All non-certificate types may act as CAs */
723 if ((k = calloc(1, sizeof(*k))) == NULL)
724 return NULL;
725 k->type = type;
726 k->ecdsa_nid = -1;
727 if (impl != NULL && impl->funcs->alloc != NULL) {
728 if (impl->funcs->alloc(k) != 0) {
729 free(k);
730 return NULL;
731 }
732 }
733 if (sshkey_is_cert(k)) {
734 if ((k->cert = cert_new()) == NULL) {
735 sshkey_free(k);
736 return NULL;
737 }
738 }
739
740 return k;
741 }
742
743 /* Frees common FIDO fields */
744 void
745 sshkey_sk_cleanup(struct sshkey *k)
746 {
747 free(k->sk_application);
748 sshbuf_free(k->sk_key_handle);
749 sshbuf_free(k->sk_reserved);
750 k->sk_application = NULL;
751 k->sk_key_handle = k->sk_reserved = NULL;
752 }
753
754 #if defined(MAP_CONCEAL)
755 # define PREKEY_MMAP_FLAG MAP_CONCEAL
756 #elif defined(MAP_NOCORE)
757 # define PREKEY_MMAP_FLAG MAP_NOCORE
758 #else
759 # define PREKEY_MMAP_FLAG 0
760 #endif
761
762 static int
763 sshkey_prekey_alloc(u_char **prekeyp, size_t len)
764 {
765 u_char *prekey;
766
767 *prekeyp = NULL;
768 if ((prekey = mmap(NULL, len, PROT_READ|PROT_WRITE,
769 MAP_ANON|MAP_PRIVATE|PREKEY_MMAP_FLAG, -1, 0)) == MAP_FAILED)
770 return SSH_ERR_SYSTEM_ERROR;
771 #if defined(MADV_DONTDUMP) && !defined(MAP_CONCEAL) && !defined(MAP_NOCORE)
772 (void)madvise(prekey, len, MADV_DONTDUMP);
773 #endif
774 *prekeyp = prekey;
775 return 0;
776 }
777
778 static void
779 sshkey_prekey_free(void *prekey, size_t len)
780 {
781 if (prekey == NULL)
782 return;
783 munmap(prekey, len);
784 }
785
786 static void
787 sshkey_free_contents(struct sshkey *k)
788 {
789 const struct sshkey_impl *impl;
790
791 if (k == NULL)
792 return;
793 if ((impl = sshkey_impl_from_type(k->type)) != NULL &&
794 impl->funcs->cleanup != NULL)
795 impl->funcs->cleanup(k);
796 if (sshkey_is_cert(k))
797 cert_free(k->cert);
798 freezero(k->shielded_private, k->shielded_len);
799 sshkey_prekey_free(k->shield_prekey, k->shield_prekey_len);
800 }
801
802 void
803 sshkey_free(struct sshkey *k)
804 {
805 sshkey_free_contents(k);
806 freezero(k, sizeof(*k));
807 }
808
809 static int
810 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
811 {
812 if (a == NULL && b == NULL)
813 return 1;
814 if (a == NULL || b == NULL)
815 return 0;
816 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
817 return 0;
818 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
819 sshbuf_len(a->certblob)) != 0)
820 return 0;
821 return 1;
822 }
823
824 /* Compares FIDO-specific pubkey fields only */
825 int
826 sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b)
827 {
828 if (a->sk_application == NULL || b->sk_application == NULL)
829 return 0;
830 if (strcmp(a->sk_application, b->sk_application) != 0)
831 return 0;
832 return 1;
833 }
834
835 /*
836 * Compare public portions of key only, allowing comparisons between
837 * certificates and plain keys too.
838 */
839 int
840 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
841 {
842 const struct sshkey_impl *impl;
843
844 if (a == NULL || b == NULL ||
845 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
846 return 0;
847 if ((impl = sshkey_impl_from_type(a->type)) == NULL)
848 return 0;
849 return impl->funcs->equal(a, b);
850 }
851
852 int
853 sshkey_equal(const struct sshkey *a, const struct sshkey *b)
854 {
855 if (a == NULL || b == NULL || a->type != b->type)
856 return 0;
857 if (sshkey_is_cert(a)) {
858 if (!cert_compare(a->cert, b->cert))
859 return 0;
860 }
861 return sshkey_equal_public(a, b);
862 }
863
864
865 /* Serialise common FIDO key parts */
866 int
867 sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b)
868 {
869 int r;
870
871 if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0)
872 return r;
873
874 return 0;
875 }
876
877 static int
878 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
879 enum sshkey_serialize_rep opts)
880 {
881 int type, ret = SSH_ERR_INTERNAL_ERROR;
882 const char *typename;
883 const struct sshkey_impl *impl;
884
885 if (key == NULL)
886 return SSH_ERR_INVALID_ARGUMENT;
887
888 type = force_plain ? sshkey_type_plain(key->type) : key->type;
889
890 if (sshkey_type_is_cert(type)) {
891 if (key->cert == NULL)
892 return SSH_ERR_EXPECTED_CERT;
893 if (sshbuf_len(key->cert->certblob) == 0)
894 return SSH_ERR_KEY_LACKS_CERTBLOB;
895 /* Use the existing blob */
896 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
897 return ret;
898 return 0;
899 }
900 if ((impl = sshkey_impl_from_type(type)) == NULL)
901 return SSH_ERR_KEY_TYPE_UNKNOWN;
902
903 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
904 if ((ret = sshbuf_put_cstring(b, typename)) != 0)
905 return ret;
906 return impl->funcs->serialize_public(key, b, opts);
907 }
908
909 int
910 sshkey_putb(const struct sshkey *key, struct sshbuf *b)
911 {
912 return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
913 }
914
915 int
916 sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
917 enum sshkey_serialize_rep opts)
918 {
919 struct sshbuf *tmp;
920 int r;
921
922 if ((tmp = sshbuf_new()) == NULL)
923 return SSH_ERR_ALLOC_FAIL;
924 r = to_blob_buf(key, tmp, 0, opts);
925 if (r == 0)
926 r = sshbuf_put_stringb(b, tmp);
927 sshbuf_free(tmp);
928 return r;
929 }
930
931 int
932 sshkey_puts(const struct sshkey *key, struct sshbuf *b)
933 {
934 return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
935 }
936
937 int
938 sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
939 {
940 return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
941 }
942
943 static int
944 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
945 enum sshkey_serialize_rep opts)
946 {
947 int ret = SSH_ERR_INTERNAL_ERROR;
948 size_t len;
949 struct sshbuf *b = NULL;
950
951 if (lenp != NULL)
952 *lenp = 0;
953 if (blobp != NULL)
954 *blobp = NULL;
955 if ((b = sshbuf_new()) == NULL)
956 return SSH_ERR_ALLOC_FAIL;
957 if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
958 goto out;
959 len = sshbuf_len(b);
960 if (lenp != NULL)
961 *lenp = len;
962 if (blobp != NULL) {
963 if ((*blobp = malloc(len)) == NULL) {
964 ret = SSH_ERR_ALLOC_FAIL;
965 goto out;
966 }
967 memcpy(*blobp, sshbuf_ptr(b), len);
968 }
969 ret = 0;
970 out:
971 sshbuf_free(b);
972 return ret;
973 }
974
975 int
976 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
977 {
978 return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
979 }
980
981 int
982 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
983 {
984 return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
985 }
986
987 int
988 sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
989 u_char **retp, size_t *lenp)
990 {
991 u_char *blob = NULL, *ret = NULL;
992 size_t blob_len = 0;
993 int r = SSH_ERR_INTERNAL_ERROR;
994
995 if (retp != NULL)
996 *retp = NULL;
997 if (lenp != NULL)
998 *lenp = 0;
999 if (ssh_digest_bytes(dgst_alg) == 0) {
1000 r = SSH_ERR_INVALID_ARGUMENT;
1001 goto out;
1002 }
1003 if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
1004 != 0)
1005 goto out;
1006 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
1007 r = SSH_ERR_ALLOC_FAIL;
1008 goto out;
1009 }
1010 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1011 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
1012 goto out;
1013 /* success */
1014 if (retp != NULL) {
1015 *retp = ret;
1016 ret = NULL;
1017 }
1018 if (lenp != NULL)
1019 *lenp = ssh_digest_bytes(dgst_alg);
1020 r = 0;
1021 out:
1022 free(ret);
1023 if (blob != NULL)
1024 freezero(blob, blob_len);
1025 return r;
1026 }
1027
1028 static char *
1029 fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1030 {
1031 char *ret;
1032 size_t plen = strlen(alg) + 1;
1033 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
1034
1035 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
1036 return NULL;
1037 strlcpy(ret, alg, rlen);
1038 strlcat(ret, ":", rlen);
1039 if (dgst_raw_len == 0)
1040 return ret;
1041 if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1042 freezero(ret, rlen);
1043 return NULL;
1044 }
1045 /* Trim padding characters from end */
1046 ret[strcspn(ret, "=")] = '\0';
1047 return ret;
1048 }
1049
1050 static char *
1051 fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1052 {
1053 char *retval, hex[5];
1054 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1055
1056 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1057 return NULL;
1058 strlcpy(retval, alg, rlen);
1059 strlcat(retval, ":", rlen);
1060 for (i = 0; i < dgst_raw_len; i++) {
1061 snprintf(hex, sizeof(hex), "%s%02x",
1062 i > 0 ? ":" : "", dgst_raw[i]);
1063 strlcat(retval, hex, rlen);
1064 }
1065 return retval;
1066 }
1067
1068 static char *
1069 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
1070 {
1071 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1072 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1073 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1074 u_int i, j = 0, rounds, seed = 1;
1075 char *retval;
1076
1077 rounds = (dgst_raw_len / 2) + 1;
1078 if ((retval = calloc(rounds, 6)) == NULL)
1079 return NULL;
1080 retval[j++] = 'x';
1081 for (i = 0; i < rounds; i++) {
1082 u_int idx0, idx1, idx2, idx3, idx4;
1083 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1084 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1085 seed) % 6;
1086 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1087 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1088 (seed / 6)) % 6;
1089 retval[j++] = vowels[idx0];
1090 retval[j++] = consonants[idx1];
1091 retval[j++] = vowels[idx2];
1092 if ((i + 1) < rounds) {
1093 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1094 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1095 retval[j++] = consonants[idx3];
1096 retval[j++] = '-';
1097 retval[j++] = consonants[idx4];
1098 seed = ((seed * 5) +
1099 ((((u_int)(dgst_raw[2 * i])) * 7) +
1100 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1101 }
1102 } else {
1103 idx0 = seed % 6;
1104 idx1 = 16;
1105 idx2 = seed / 6;
1106 retval[j++] = vowels[idx0];
1107 retval[j++] = consonants[idx1];
1108 retval[j++] = vowels[idx2];
1109 }
1110 }
1111 retval[j++] = 'x';
1112 retval[j++] = '\0';
1113 return retval;
1114 }
1115
1116 /*
1117 * Draw an ASCII-Art representing the fingerprint so human brain can
1118 * profit from its built-in pattern recognition ability.
1119 * This technique is called "random art" and can be found in some
1120 * scientific publications like this original paper:
1121 *
1122 * "Hash Visualization: a New Technique to improve Real-World Security",
1123 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1124 * Techniques and E-Commerce (CrypTEC '99)
1125 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1126 *
1127 * The subject came up in a talk by Dan Kaminsky, too.
1128 *
1129 * If you see the picture is different, the key is different.
1130 * If the picture looks the same, you still know nothing.
1131 *
1132 * The algorithm used here is a worm crawling over a discrete plane,
1133 * leaving a trace (augmenting the field) everywhere it goes.
1134 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1135 * makes the respective movement vector be ignored for this turn.
1136 * Graphs are not unambiguous, because circles in graphs can be
1137 * walked in either direction.
1138 */
1139
1140 /*
1141 * Field sizes for the random art. Have to be odd, so the starting point
1142 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1143 * Else pictures would be too dense, and drawing the frame would
1144 * fail, too, because the key type would not fit in anymore.
1145 */
1146 #define FLDBASE 8
1147 #define FLDSIZE_Y (FLDBASE + 1)
1148 #define FLDSIZE_X (FLDBASE * 2 + 1)
1149 static char *
1150 fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1151 const struct sshkey *k)
1152 {
1153 /*
1154 * Chars to be used after each other every time the worm
1155 * intersects with itself. Matter of taste.
1156 */
1157 char *augmentation_string = " .o+=*BOX@%&#/^SE";
1158 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1159 u_char field[FLDSIZE_X][FLDSIZE_Y];
1160 size_t i, tlen, hlen;
1161 u_int b;
1162 int x, y, r;
1163 size_t len = strlen(augmentation_string) - 1;
1164
1165 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1166 return NULL;
1167
1168 /* initialize field */
1169 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1170 x = FLDSIZE_X / 2;
1171 y = FLDSIZE_Y / 2;
1172
1173 /* process raw key */
1174 for (i = 0; i < dgst_raw_len; i++) {
1175 int input;
1176 /* each byte conveys four 2-bit move commands */
1177 input = dgst_raw[i];
1178 for (b = 0; b < 4; b++) {
1179 /* evaluate 2 bit, rest is shifted later */
1180 x += (input & 0x1) ? 1 : -1;
1181 y += (input & 0x2) ? 1 : -1;
1182
1183 /* assure we are still in bounds */
1184 x = MAXIMUM(x, 0);
1185 y = MAXIMUM(y, 0);
1186 x = MINIMUM(x, FLDSIZE_X - 1);
1187 y = MINIMUM(y, FLDSIZE_Y - 1);
1188
1189 /* augment the field */
1190 if (field[x][y] < len - 2)
1191 field[x][y]++;
1192 input = input >> 2;
1193 }
1194 }
1195
1196 /* mark starting point and end point*/
1197 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1198 field[x][y] = len;
1199
1200 /* assemble title */
1201 r = snprintf(title, sizeof(title), "[%s %u]",
1202 sshkey_type(k), sshkey_size(k));
1203 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1204 if (r < 0 || r > (int)sizeof(title))
1205 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1206 tlen = (r <= 0) ? 0 : strlen(title);
1207
1208 /* assemble hash ID. */
1209 r = snprintf(hash, sizeof(hash), "[%s]", alg);
1210 hlen = (r <= 0) ? 0 : strlen(hash);
1211
1212 /* output upper border */
1213 p = retval;
1214 *p++ = '+';
1215 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1216 *p++ = '-';
1217 memcpy(p, title, tlen);
1218 p += tlen;
1219 for (i += tlen; i < FLDSIZE_X; i++)
1220 *p++ = '-';
1221 *p++ = '+';
1222 *p++ = '\n';
1223
1224 /* output content */
1225 for (y = 0; y < FLDSIZE_Y; y++) {
1226 *p++ = '|';
1227 for (x = 0; x < FLDSIZE_X; x++)
1228 *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1229 *p++ = '|';
1230 *p++ = '\n';
1231 }
1232
1233 /* output lower border */
1234 *p++ = '+';
1235 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1236 *p++ = '-';
1237 memcpy(p, hash, hlen);
1238 p += hlen;
1239 for (i += hlen; i < FLDSIZE_X; i++)
1240 *p++ = '-';
1241 *p++ = '+';
1242
1243 return retval;
1244 }
1245
1246 char *
1247 sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1248 enum sshkey_fp_rep dgst_rep)
1249 {
1250 char *retval = NULL;
1251 u_char *dgst_raw;
1252 size_t dgst_raw_len;
1253
1254 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1255 return NULL;
1256 switch (dgst_rep) {
1257 case SSH_FP_DEFAULT:
1258 if (dgst_alg == SSH_DIGEST_MD5) {
1259 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1260 dgst_raw, dgst_raw_len);
1261 } else {
1262 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1263 dgst_raw, dgst_raw_len);
1264 }
1265 break;
1266 case SSH_FP_HEX:
1267 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1268 dgst_raw, dgst_raw_len);
1269 break;
1270 case SSH_FP_BASE64:
1271 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1272 dgst_raw, dgst_raw_len);
1273 break;
1274 case SSH_FP_BUBBLEBABBLE:
1275 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1276 break;
1277 case SSH_FP_RANDOMART:
1278 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1279 dgst_raw, dgst_raw_len, k);
1280 break;
1281 default:
1282 freezero(dgst_raw, dgst_raw_len);
1283 return NULL;
1284 }
1285 freezero(dgst_raw, dgst_raw_len);
1286 return retval;
1287 }
1288
1289 static int
1290 peek_type_nid(const char *s, size_t l, int *nid)
1291 {
1292 const struct sshkey_impl *impl;
1293 int i;
1294
1295 for (i = 0; keyimpls[i] != NULL; i++) {
1296 impl = keyimpls[i];
1297 if (impl->name == NULL || strlen(impl->name) != l)
1298 continue;
1299 if (memcmp(s, impl->name, l) == 0) {
1300 *nid = -1;
1301 if (key_type_is_ecdsa_variant(impl->type))
1302 *nid = impl->nid;
1303 return impl->type;
1304 }
1305 }
1306 return KEY_UNSPEC;
1307 }
1308
1309 /* XXX this can now be made const char * */
1310 int
1311 sshkey_read(struct sshkey *ret, char **cpp)
1312 {
1313 struct sshkey *k;
1314 char *cp, *blobcopy;
1315 size_t space;
1316 int r, type, curve_nid = -1;
1317 struct sshbuf *blob;
1318
1319 if (ret == NULL)
1320 return SSH_ERR_INVALID_ARGUMENT;
1321 if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL)
1322 return SSH_ERR_INVALID_ARGUMENT;
1323
1324 /* Decode type */
1325 cp = *cpp;
1326 space = strcspn(cp, " \t");
1327 if (space == strlen(cp))
1328 return SSH_ERR_INVALID_FORMAT;
1329 if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1330 return SSH_ERR_INVALID_FORMAT;
1331
1332 /* skip whitespace */
1333 for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1334 ;
1335 if (*cp == '\0')
1336 return SSH_ERR_INVALID_FORMAT;
1337 if (ret->type != KEY_UNSPEC && ret->type != type)
1338 return SSH_ERR_KEY_TYPE_MISMATCH;
1339 if ((blob = sshbuf_new()) == NULL)
1340 return SSH_ERR_ALLOC_FAIL;
1341
1342 /* find end of keyblob and decode */
1343 space = strcspn(cp, " \t");
1344 if ((blobcopy = strndup(cp, space)) == NULL) {
1345 sshbuf_free(blob);
1346 return SSH_ERR_ALLOC_FAIL;
1347 }
1348 if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1349 free(blobcopy);
1350 sshbuf_free(blob);
1351 return r;
1352 }
1353 free(blobcopy);
1354 if ((r = sshkey_fromb(blob, &k)) != 0) {
1355 sshbuf_free(blob);
1356 return r;
1357 }
1358 sshbuf_free(blob);
1359
1360 /* skip whitespace and leave cp at start of comment */
1361 for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1362 ;
1363
1364 /* ensure type of blob matches type at start of line */
1365 if (k->type != type) {
1366 sshkey_free(k);
1367 return SSH_ERR_KEY_TYPE_MISMATCH;
1368 }
1369 if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1370 sshkey_free(k);
1371 return SSH_ERR_EC_CURVE_MISMATCH;
1372 }
1373
1374 /* Fill in ret from parsed key */
1375 sshkey_free_contents(ret);
1376 *ret = *k;
1377 freezero(k, sizeof(*k));
1378
1379 /* success */
1380 *cpp = cp;
1381 return 0;
1382 }
1383
1384 int
1385 sshkey_to_base64(const struct sshkey *key, char **b64p)
1386 {
1387 int r = SSH_ERR_INTERNAL_ERROR;
1388 struct sshbuf *b = NULL;
1389 char *uu = NULL;
1390
1391 if (b64p != NULL)
1392 *b64p = NULL;
1393 if ((b = sshbuf_new()) == NULL)
1394 return SSH_ERR_ALLOC_FAIL;
1395 if ((r = sshkey_putb(key, b)) != 0)
1396 goto out;
1397 if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1398 r = SSH_ERR_ALLOC_FAIL;
1399 goto out;
1400 }
1401 /* Success */
1402 if (b64p != NULL) {
1403 *b64p = uu;
1404 uu = NULL;
1405 }
1406 r = 0;
1407 out:
1408 sshbuf_free(b);
1409 free(uu);
1410 return r;
1411 }
1412
1413 int
1414 sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1415 {
1416 int r = SSH_ERR_INTERNAL_ERROR;
1417 char *uu = NULL;
1418
1419 if ((r = sshkey_to_base64(key, &uu)) != 0)
1420 goto out;
1421 if ((r = sshbuf_putf(b, "%s %s",
1422 sshkey_ssh_name(key), uu)) != 0)
1423 goto out;
1424 r = 0;
1425 out:
1426 free(uu);
1427 return r;
1428 }
1429
1430 int
1431 sshkey_write(const struct sshkey *key, FILE *f)
1432 {
1433 struct sshbuf *b = NULL;
1434 int r = SSH_ERR_INTERNAL_ERROR;
1435
1436 if ((b = sshbuf_new()) == NULL)
1437 return SSH_ERR_ALLOC_FAIL;
1438 if ((r = sshkey_format_text(key, b)) != 0)
1439 goto out;
1440 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1441 if (feof(f))
1442 errno = EPIPE;
1443 r = SSH_ERR_SYSTEM_ERROR;
1444 goto out;
1445 }
1446 /* Success */
1447 r = 0;
1448 out:
1449 sshbuf_free(b);
1450 return r;
1451 }
1452
1453 const char *
1454 sshkey_cert_type(const struct sshkey *k)
1455 {
1456 switch (k->cert->type) {
1457 case SSH2_CERT_TYPE_USER:
1458 return "user";
1459 case SSH2_CERT_TYPE_HOST:
1460 return "host";
1461 default:
1462 return "unknown";
1463 }
1464 }
1465
1466 int
1467 sshkey_check_rsa_length(const struct sshkey *k, int min_size)
1468 {
1469 #ifdef WITH_OPENSSL
1470 int nbits;
1471
1472 if (k == NULL || k->pkey == NULL ||
1473 (k->type != KEY_RSA && k->type != KEY_RSA_CERT))
1474 return 0;
1475 nbits = EVP_PKEY_bits(k->pkey);
1476 if (nbits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1477 (min_size > 0 && nbits < min_size))
1478 return SSH_ERR_KEY_LENGTH;
1479 #endif /* WITH_OPENSSL */
1480 return 0;
1481 }
1482
1483 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
1484 int
1485 sshkey_ecdsa_key_to_nid(const EC_KEY *k)
1486 {
1487 const EC_GROUP *g;
1488 int nid;
1489
1490 if (k == NULL || (g = EC_KEY_get0_group(k)) == NULL)
1491 return -1;
1492 if ((nid = EC_GROUP_get_curve_name(g)) <= 0)
1493 return -1;
1494 return nid;
1495 }
1496
1497 int
1498 sshkey_ecdsa_pkey_to_nid(EVP_PKEY *pkey)
1499 {
1500 return sshkey_ecdsa_key_to_nid(EVP_PKEY_get0_EC_KEY(pkey));
1501 }
1502 #endif /* defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) */
1503
1504 int
1505 sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1506 {
1507 struct sshkey *k;
1508 int ret = SSH_ERR_INTERNAL_ERROR;
1509 const struct sshkey_impl *impl;
1510
1511 if (keyp == NULL || sshkey_type_is_cert(type))
1512 return SSH_ERR_INVALID_ARGUMENT;
1513 *keyp = NULL;
1514 if ((impl = sshkey_impl_from_type(type)) == NULL)
1515 return SSH_ERR_KEY_TYPE_UNKNOWN;
1516 if (impl->funcs->generate == NULL)
1517 return SSH_ERR_FEATURE_UNSUPPORTED;
1518 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1519 return SSH_ERR_ALLOC_FAIL;
1520 k->type = type;
1521 if ((ret = impl->funcs->generate(k, bits)) != 0) {
1522 sshkey_free(k);
1523 return ret;
1524 }
1525 /* success */
1526 *keyp = k;
1527 return 0;
1528 }
1529
1530 int
1531 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1532 {
1533 u_int i;
1534 const struct sshkey_cert *from;
1535 struct sshkey_cert *to;
1536 int r = SSH_ERR_INTERNAL_ERROR;
1537
1538 if (to_key == NULL || (from = from_key->cert) == NULL)
1539 return SSH_ERR_INVALID_ARGUMENT;
1540
1541 if ((to = cert_new()) == NULL)
1542 return SSH_ERR_ALLOC_FAIL;
1543
1544 if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1545 (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1546 (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1547 goto out;
1548
1549 to->serial = from->serial;
1550 to->type = from->type;
1551 if (from->key_id == NULL)
1552 to->key_id = NULL;
1553 else if ((to->key_id = strdup(from->key_id)) == NULL) {
1554 r = SSH_ERR_ALLOC_FAIL;
1555 goto out;
1556 }
1557 to->valid_after = from->valid_after;
1558 to->valid_before = from->valid_before;
1559 if (from->signature_key == NULL)
1560 to->signature_key = NULL;
1561 else if ((r = sshkey_from_private(from->signature_key,
1562 &to->signature_key)) != 0)
1563 goto out;
1564 if (from->signature_type != NULL &&
1565 (to->signature_type = strdup(from->signature_type)) == NULL) {
1566 r = SSH_ERR_ALLOC_FAIL;
1567 goto out;
1568 }
1569 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1570 r = SSH_ERR_INVALID_ARGUMENT;
1571 goto out;
1572 }
1573 if (from->nprincipals > 0) {
1574 if ((to->principals = calloc(from->nprincipals,
1575 sizeof(*to->principals))) == NULL) {
1576 r = SSH_ERR_ALLOC_FAIL;
1577 goto out;
1578 }
1579 for (i = 0; i < from->nprincipals; i++) {
1580 to->principals[i] = strdup(from->principals[i]);
1581 if (to->principals[i] == NULL) {
1582 to->nprincipals = i;
1583 r = SSH_ERR_ALLOC_FAIL;
1584 goto out;
1585 }
1586 }
1587 }
1588 to->nprincipals = from->nprincipals;
1589
1590 /* success */
1591 cert_free(to_key->cert);
1592 to_key->cert = to;
1593 to = NULL;
1594 r = 0;
1595 out:
1596 cert_free(to);
1597 return r;
1598 }
1599
1600 int
1601 sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to)
1602 {
1603 /* Append security-key application string */
1604 if ((to->sk_application = strdup(from->sk_application)) == NULL)
1605 return SSH_ERR_ALLOC_FAIL;
1606 return 0;
1607 }
1608
1609 int
1610 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1611 {
1612 struct sshkey *n = NULL;
1613 int r = SSH_ERR_INTERNAL_ERROR;
1614 const struct sshkey_impl *impl;
1615
1616 *pkp = NULL;
1617 if ((impl = sshkey_impl_from_key(k)) == NULL)
1618 return SSH_ERR_KEY_TYPE_UNKNOWN;
1619 if ((n = sshkey_new(k->type)) == NULL) {
1620 r = SSH_ERR_ALLOC_FAIL;
1621 goto out;
1622 }
1623 if ((r = impl->funcs->copy_public(k, n)) != 0)
1624 goto out;
1625 if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1626 goto out;
1627 /* success */
1628 *pkp = n;
1629 n = NULL;
1630 r = 0;
1631 out:
1632 sshkey_free(n);
1633 return r;
1634 }
1635
1636 int
1637 sshkey_is_shielded(struct sshkey *k)
1638 {
1639 return k != NULL && k->shielded_private != NULL;
1640 }
1641
1642 int
1643 sshkey_shield_private(struct sshkey *k)
1644 {
1645 struct sshbuf *prvbuf = NULL;
1646 u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1647 struct sshcipher_ctx *cctx = NULL;
1648 const struct sshcipher *cipher;
1649 size_t i, enclen = 0;
1650 struct sshkey *kswap = NULL, tmp;
1651 int r = SSH_ERR_INTERNAL_ERROR;
1652
1653 #ifdef DEBUG_PK
1654 fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1655 #endif
1656 if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1657 r = SSH_ERR_INVALID_ARGUMENT;
1658 goto out;
1659 }
1660 if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1661 ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1662 r = SSH_ERR_INTERNAL_ERROR;
1663 goto out;
1664 }
1665
1666 /* Prepare a random pre-key, and from it an ephemeral key */
1667 if ((r = sshkey_prekey_alloc(&prekey, SSHKEY_SHIELD_PREKEY_LEN)) != 0)
1668 goto out;
1669 arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1670 if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1671 prekey, SSHKEY_SHIELD_PREKEY_LEN,
1672 keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1673 goto out;
1674 #ifdef DEBUG_PK
1675 fprintf(stderr, "%s: key+iv\n", __func__);
1676 sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1677 stderr);
1678 #endif
1679 if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1680 keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1681 goto out;
1682
1683 /* Serialise and encrypt the private key using the ephemeral key */
1684 if ((prvbuf = sshbuf_new()) == NULL) {
1685 r = SSH_ERR_ALLOC_FAIL;
1686 goto out;
1687 }
1688 if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1689 goto out;
1690 if ((r = sshkey_private_serialize_opt(k, prvbuf,
1691 SSHKEY_SERIALIZE_SHIELD)) != 0)
1692 goto out;
1693 /* pad to cipher blocksize */
1694 i = 0;
1695 while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1696 if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1697 goto out;
1698 }
1699 #ifdef DEBUG_PK
1700 fprintf(stderr, "%s: serialised\n", __func__);
1701 sshbuf_dump(prvbuf, stderr);
1702 #endif
1703 /* encrypt */
1704 enclen = sshbuf_len(prvbuf);
1705 if ((enc = malloc(enclen)) == NULL) {
1706 r = SSH_ERR_ALLOC_FAIL;
1707 goto out;
1708 }
1709 if ((r = cipher_crypt(cctx, 0, enc,
1710 sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1711 goto out;
1712 #ifdef DEBUG_PK
1713 fprintf(stderr, "%s: encrypted\n", __func__);
1714 sshbuf_dump_data(enc, enclen, stderr);
1715 #endif
1716
1717 /* Make a scrubbed, public-only copy of our private key argument */
1718 if ((r = sshkey_from_private(k, &kswap)) != 0)
1719 goto out;
1720
1721 /* Swap the private key out (it will be destroyed below) */
1722 tmp = *kswap;
1723 *kswap = *k;
1724 *k = tmp;
1725
1726 /* Insert the shielded key into our argument */
1727 k->shielded_private = enc;
1728 k->shielded_len = enclen;
1729 k->shield_prekey = prekey;
1730 k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1731 enc = prekey = NULL; /* transferred */
1732 enclen = 0;
1733
1734 /* preserve key fields that are required for correct operation */
1735 k->sk_flags = kswap->sk_flags;
1736
1737 /* success */
1738 r = 0;
1739
1740 out:
1741 /* XXX behaviour on error - invalidate original private key? */
1742 cipher_free(cctx);
1743 explicit_bzero(keyiv, sizeof(keyiv));
1744 explicit_bzero(&tmp, sizeof(tmp));
1745 freezero(enc, enclen);
1746 sshkey_prekey_free(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1747 sshkey_free(kswap);
1748 sshbuf_free(prvbuf);
1749 return r;
1750 }
1751
1752 /* Check deterministic padding after private key */
1753 static int
1754 private2_check_padding(struct sshbuf *decrypted)
1755 {
1756 u_char pad;
1757 size_t i;
1758 int r;
1759
1760 i = 0;
1761 while (sshbuf_len(decrypted)) {
1762 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1763 goto out;
1764 if (pad != (++i & 0xff)) {
1765 r = SSH_ERR_INVALID_FORMAT;
1766 goto out;
1767 }
1768 }
1769 /* success */
1770 r = 0;
1771 out:
1772 explicit_bzero(&pad, sizeof(pad));
1773 explicit_bzero(&i, sizeof(i));
1774 return r;
1775 }
1776
1777 int
1778 sshkey_unshield_private(struct sshkey *k)
1779 {
1780 struct sshbuf *prvbuf = NULL;
1781 u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1782 struct sshcipher_ctx *cctx = NULL;
1783 const struct sshcipher *cipher;
1784 struct sshkey *kswap = NULL, tmp;
1785 int r = SSH_ERR_INTERNAL_ERROR;
1786
1787 #ifdef DEBUG_PK
1788 fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1789 #endif
1790 if (!sshkey_is_shielded(k))
1791 return 0; /* nothing to do */
1792
1793 if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1794 r = SSH_ERR_INVALID_ARGUMENT;
1795 goto out;
1796 }
1797 if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1798 ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1799 r = SSH_ERR_INTERNAL_ERROR;
1800 goto out;
1801 }
1802 /* check size of shielded key blob */
1803 if (k->shielded_len < cipher_blocksize(cipher) ||
1804 (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1805 r = SSH_ERR_INVALID_FORMAT;
1806 goto out;
1807 }
1808
1809 /* Calculate the ephemeral key from the prekey */
1810 if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1811 k->shield_prekey, k->shield_prekey_len,
1812 keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1813 goto out;
1814 if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1815 keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1816 goto out;
1817 #ifdef DEBUG_PK
1818 fprintf(stderr, "%s: key+iv\n", __func__);
1819 sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1820 stderr);
1821 #endif
1822
1823 /* Decrypt and parse the shielded private key using the ephemeral key */
1824 if ((prvbuf = sshbuf_new()) == NULL) {
1825 r = SSH_ERR_ALLOC_FAIL;
1826 goto out;
1827 }
1828 if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
1829 goto out;
1830 /* decrypt */
1831 #ifdef DEBUG_PK
1832 fprintf(stderr, "%s: encrypted\n", __func__);
1833 sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
1834 #endif
1835 if ((r = cipher_crypt(cctx, 0, cp,
1836 k->shielded_private, k->shielded_len, 0, 0)) != 0)
1837 goto out;
1838 #ifdef DEBUG_PK
1839 fprintf(stderr, "%s: serialised\n", __func__);
1840 sshbuf_dump(prvbuf, stderr);
1841 #endif
1842 /* Parse private key */
1843 if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
1844 goto out;
1845
1846 if ((r = private2_check_padding(prvbuf)) != 0)
1847 goto out;
1848
1849 /* Swap the parsed key back into place */
1850 tmp = *kswap;
1851 *kswap = *k;
1852 *k = tmp;
1853
1854 /* success */
1855 r = 0;
1856
1857 out:
1858 cipher_free(cctx);
1859 explicit_bzero(keyiv, sizeof(keyiv));
1860 explicit_bzero(&tmp, sizeof(tmp));
1861 sshkey_free(kswap);
1862 sshbuf_free(prvbuf);
1863 return r;
1864 }
1865
1866 static int
1867 cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1868 {
1869 struct sshbuf *principals = NULL, *crit = NULL;
1870 struct sshbuf *exts = NULL, *ca = NULL;
1871 u_char *sig = NULL;
1872 size_t signed_len = 0, slen = 0, kidlen = 0;
1873 int ret = SSH_ERR_INTERNAL_ERROR;
1874
1875 /* Copy the entire key blob for verification and later serialisation */
1876 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1877 return ret;
1878
1879 /* Parse body of certificate up to signature */
1880 if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1881 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1882 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1883 (ret = sshbuf_froms(b, &principals)) != 0 ||
1884 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1885 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1886 (ret = sshbuf_froms(b, &crit)) != 0 ||
1887 (ret = sshbuf_froms(b, &exts)) != 0 ||
1888 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1889 (ret = sshbuf_froms(b, &ca)) != 0) {
1890 /* XXX debug print error for ret */
1891 ret = SSH_ERR_INVALID_FORMAT;
1892 goto out;
1893 }
1894
1895 /* Signature is left in the buffer so we can calculate this length */
1896 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1897
1898 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1899 ret = SSH_ERR_INVALID_FORMAT;
1900 goto out;
1901 }
1902
1903 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1904 key->cert->type != SSH2_CERT_TYPE_HOST) {
1905 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1906 goto out;
1907 }
1908
1909 /* Parse principals section */
1910 while (sshbuf_len(principals) > 0) {
1911 char *principal = NULL;
1912 char **oprincipals = NULL;
1913
1914 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1915 ret = SSH_ERR_INVALID_FORMAT;
1916 goto out;
1917 }
1918 if ((ret = sshbuf_get_cstring(principals, &principal,
1919 NULL)) != 0) {
1920 ret = SSH_ERR_INVALID_FORMAT;
1921 goto out;
1922 }
1923 oprincipals = key->cert->principals;
1924 key->cert->principals = recallocarray(key->cert->principals,
1925 key->cert->nprincipals, key->cert->nprincipals + 1,
1926 sizeof(*key->cert->principals));
1927 if (key->cert->principals == NULL) {
1928 free(principal);
1929 key->cert->principals = oprincipals;
1930 ret = SSH_ERR_ALLOC_FAIL;
1931 goto out;
1932 }
1933 key->cert->principals[key->cert->nprincipals++] = principal;
1934 }
1935
1936 /*
1937 * Stash a copies of the critical options and extensions sections
1938 * for later use.
1939 */
1940 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1941 (exts != NULL &&
1942 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1943 goto out;
1944
1945 /*
1946 * Validate critical options and extensions sections format.
1947 */
1948 while (sshbuf_len(crit) != 0) {
1949 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1950 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1951 sshbuf_reset(key->cert->critical);
1952 ret = SSH_ERR_INVALID_FORMAT;
1953 goto out;
1954 }
1955 }
1956 while (exts != NULL && sshbuf_len(exts) != 0) {
1957 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1958 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1959 sshbuf_reset(key->cert->extensions);
1960 ret = SSH_ERR_INVALID_FORMAT;
1961 goto out;
1962 }
1963 }
1964
1965 /* Parse CA key and check signature */
1966 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1967 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1968 goto out;
1969 }
1970 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1971 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1972 goto out;
1973 }
1974 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1975 sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1976 goto out;
1977 if ((ret = sshkey_get_sigtype(sig, slen,
1978 &key->cert->signature_type)) != 0)
1979 goto out;
1980
1981 /* Success */
1982 ret = 0;
1983 out:
1984 sshbuf_free(ca);
1985 sshbuf_free(crit);
1986 sshbuf_free(exts);
1987 sshbuf_free(principals);
1988 free(sig);
1989 return ret;
1990 }
1991
1992 int
1993 sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key)
1994 {
1995 /* Parse additional security-key application string */
1996 if (sshbuf_get_cstring(b, &key->sk_application, NULL) != 0)
1997 return SSH_ERR_INVALID_FORMAT;
1998 return 0;
1999 }
2000
2001 static int
2002 sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2003 int allow_cert)
2004 {
2005 int type, ret = SSH_ERR_INTERNAL_ERROR;
2006 char *ktype = NULL;
2007 struct sshkey *key = NULL;
2008 struct sshbuf *copy;
2009 const struct sshkey_impl *impl;
2010
2011 #ifdef DEBUG_PK /* XXX */
2012 sshbuf_dump(b, stderr);
2013 #endif
2014 if (keyp != NULL)
2015 *keyp = NULL;
2016 if ((copy = sshbuf_fromb(b)) == NULL) {
2017 ret = SSH_ERR_ALLOC_FAIL;
2018 goto out;
2019 }
2020 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2021 ret = SSH_ERR_INVALID_FORMAT;
2022 goto out;
2023 }
2024
2025 type = sshkey_type_from_name(ktype);
2026 if (!allow_cert && sshkey_type_is_cert(type)) {
2027 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2028 goto out;
2029 }
2030 if ((impl = sshkey_impl_from_type(type)) == NULL) {
2031 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2032 goto out;
2033 }
2034 if ((key = sshkey_new(type)) == NULL) {
2035 ret = SSH_ERR_ALLOC_FAIL;
2036 goto out;
2037 }
2038 if (sshkey_type_is_cert(type)) {
2039 /* Skip nonce that precedes all certificates */
2040 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2041 ret = SSH_ERR_INVALID_FORMAT;
2042 goto out;
2043 }
2044 }
2045 if ((ret = impl->funcs->deserialize_public(ktype, b, key)) != 0)
2046 goto out;
2047
2048 /* Parse certificate potion */
2049 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
2050 goto out;
2051
2052 if (key != NULL && sshbuf_len(b) != 0) {
2053 ret = SSH_ERR_INVALID_FORMAT;
2054 goto out;
2055 }
2056 ret = 0;
2057 if (keyp != NULL) {
2058 *keyp = key;
2059 key = NULL;
2060 }
2061 out:
2062 sshbuf_free(copy);
2063 sshkey_free(key);
2064 free(ktype);
2065 return ret;
2066 }
2067
2068 int
2069 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2070 {
2071 struct sshbuf *b;
2072 int r;
2073
2074 if ((b = sshbuf_from(blob, blen)) == NULL)
2075 return SSH_ERR_ALLOC_FAIL;
2076 r = sshkey_from_blob_internal(b, keyp, 1);
2077 sshbuf_free(b);
2078 return r;
2079 }
2080
2081 int
2082 sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2083 {
2084 return sshkey_from_blob_internal(b, keyp, 1);
2085 }
2086
2087 int
2088 sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2089 {
2090 struct sshbuf *b;
2091 int r;
2092
2093 if ((r = sshbuf_froms(buf, &b)) != 0)
2094 return r;
2095 r = sshkey_from_blob_internal(b, keyp, 1);
2096 sshbuf_free(b);
2097 return r;
2098 }
2099
2100 int
2101 sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
2102 {
2103 int r;
2104 struct sshbuf *b = NULL;
2105 char *sigtype = NULL;
2106
2107 if (sigtypep != NULL)
2108 *sigtypep = NULL;
2109 if ((b = sshbuf_from(sig, siglen)) == NULL)
2110 return SSH_ERR_ALLOC_FAIL;
2111 if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2112 goto out;
2113 /* success */
2114 if (sigtypep != NULL) {
2115 *sigtypep = sigtype;
2116 sigtype = NULL;
2117 }
2118 r = 0;
2119 out:
2120 free(sigtype);
2121 sshbuf_free(b);
2122 return r;
2123 }
2124
2125 /*
2126 *
2127 * Checks whether a certificate's signature type is allowed.
2128 * Returns 0 (success) if the certificate signature type appears in the
2129 * "allowed" pattern-list, or the key is not a certificate to begin with.
2130 * Otherwise returns a ssherr.h code.
2131 */
2132 int
2133 sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2134 {
2135 if (key == NULL || allowed == NULL)
2136 return SSH_ERR_INVALID_ARGUMENT;
2137 if (!sshkey_type_is_cert(key->type))
2138 return 0;
2139 if (key->cert == NULL || key->cert->signature_type == NULL)
2140 return SSH_ERR_INVALID_ARGUMENT;
2141 if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2142 return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2143 return 0;
2144 }
2145
2146 /*
2147 * Returns the expected signature algorithm for a given public key algorithm.
2148 */
2149 const char *
2150 sshkey_sigalg_by_name(const char *name)
2151 {
2152 const struct sshkey_impl *impl;
2153 int i;
2154
2155 for (i = 0; keyimpls[i] != NULL; i++) {
2156 impl = keyimpls[i];
2157 if (strcmp(impl->name, name) != 0)
2158 continue;
2159 if (impl->sigalg != NULL)
2160 return impl->sigalg;
2161 if (!impl->cert)
2162 return impl->name;
2163 return sshkey_ssh_name_from_type_nid(
2164 sshkey_type_plain(impl->type), impl->nid);
2165 }
2166 return NULL;
2167 }
2168
2169 /*
2170 * Verifies that the signature algorithm appearing inside the signature blob
2171 * matches that which was requested.
2172 */
2173 int
2174 sshkey_check_sigtype(const u_char *sig, size_t siglen,
2175 const char *requested_alg)
2176 {
2177 const char *expected_alg;
2178 char *sigtype = NULL;
2179 int r;
2180
2181 if (requested_alg == NULL)
2182 return 0;
2183 if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
2184 return SSH_ERR_INVALID_ARGUMENT;
2185 if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
2186 return r;
2187 r = strcmp(expected_alg, sigtype) == 0;
2188 free(sigtype);
2189 return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
2190 }
2191
2192 int
2193 sshkey_sign(struct sshkey *key,
2194 u_char **sigp, size_t *lenp,
2195 const u_char *data, size_t datalen,
2196 const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
2197 {
2198 int was_shielded = sshkey_is_shielded(key);
2199 int r2, r = SSH_ERR_INTERNAL_ERROR;
2200 const struct sshkey_impl *impl;
2201
2202 if (sigp != NULL)
2203 *sigp = NULL;
2204 if (lenp != NULL)
2205 *lenp = 0;
2206 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2207 return SSH_ERR_INVALID_ARGUMENT;
2208 if ((impl = sshkey_impl_from_key(key)) == NULL)
2209 return SSH_ERR_KEY_TYPE_UNKNOWN;
2210 if ((r = sshkey_unshield_private(key)) != 0)
2211 return r;
2212 if (sshkey_is_sk(key)) {
2213 r = sshsk_sign(sk_provider, key, sigp, lenp, data,
2214 datalen, compat, sk_pin);
2215 } else {
2216 if (impl->funcs->sign == NULL)
2217 r = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2218 else {
2219 r = impl->funcs->sign(key, sigp, lenp, data, datalen,
2220 alg, sk_provider, sk_pin, compat);
2221 }
2222 }
2223 if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2224 return r2;
2225 return r;
2226 }
2227
2228 /*
2229 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2230 * If "alg" specified, then the signature must use that algorithm.
2231 */
2232 int
2233 sshkey_verify(const struct sshkey *key,
2234 const u_char *sig, size_t siglen,
2235 const u_char *data, size_t dlen, const char *alg, u_int compat,
2236 struct sshkey_sig_details **detailsp)
2237 {
2238 const struct sshkey_impl *impl;
2239
2240 if (detailsp != NULL)
2241 *detailsp = NULL;
2242 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2243 return SSH_ERR_INVALID_ARGUMENT;
2244 if ((impl = sshkey_impl_from_key(key)) == NULL)
2245 return SSH_ERR_KEY_TYPE_UNKNOWN;
2246 return impl->funcs->verify(key, sig, siglen, data, dlen,
2247 alg, compat, detailsp);
2248 }
2249
2250 /* Convert a plain key to their _CERT equivalent */
2251 int
2252 sshkey_to_certified(struct sshkey *k)
2253 {
2254 int newtype;
2255
2256 if ((newtype = sshkey_type_certified(k->type)) == -1)
2257 return SSH_ERR_INVALID_ARGUMENT;
2258 if ((k->cert = cert_new()) == NULL)
2259 return SSH_ERR_ALLOC_FAIL;
2260 k->type = newtype;
2261 return 0;
2262 }
2263
2264 /* Convert a certificate to its raw key equivalent */
2265 int
2266 sshkey_drop_cert(struct sshkey *k)
2267 {
2268 if (!sshkey_type_is_cert(k->type))
2269 return SSH_ERR_KEY_TYPE_UNKNOWN;
2270 cert_free(k->cert);
2271 k->cert = NULL;
2272 k->type = sshkey_type_plain(k->type);
2273 return 0;
2274 }
2275
2276 /* Sign a certified key, (re-)generating the signed certblob. */
2277 int
2278 sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2279 const char *sk_provider, const char *sk_pin,
2280 sshkey_certify_signer *signer, void *signer_ctx)
2281 {
2282 const struct sshkey_impl *impl;
2283 struct sshbuf *principals = NULL;
2284 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2285 size_t i, ca_len, sig_len;
2286 int ret = SSH_ERR_INTERNAL_ERROR;
2287 struct sshbuf *cert = NULL;
2288 char *sigtype = NULL;
2289
2290 if (k == NULL || k->cert == NULL ||
2291 k->cert->certblob == NULL || ca == NULL)
2292 return SSH_ERR_INVALID_ARGUMENT;
2293 if (!sshkey_is_cert(k))
2294 return SSH_ERR_KEY_TYPE_UNKNOWN;
2295 if (!sshkey_type_is_valid_ca(ca->type))
2296 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2297 if ((impl = sshkey_impl_from_key(k)) == NULL)
2298 return SSH_ERR_INTERNAL_ERROR;
2299
2300 /*
2301 * If no alg specified as argument but a signature_type was set,
2302 * then prefer that. If both were specified, then they must match.
2303 */
2304 if (alg == NULL)
2305 alg = k->cert->signature_type;
2306 else if (k->cert->signature_type != NULL &&
2307 strcmp(alg, k->cert->signature_type) != 0)
2308 return SSH_ERR_INVALID_ARGUMENT;
2309
2310 /*
2311 * If no signing algorithm or signature_type was specified and we're
2312 * using a RSA key, then default to a good signature algorithm.
2313 */
2314 if (alg == NULL && ca->type == KEY_RSA)
2315 alg = "rsa-sha2-512";
2316
2317 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2318 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2319
2320 cert = k->cert->certblob; /* for readability */
2321 sshbuf_reset(cert);
2322 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2323 goto out;
2324
2325 /* -v01 certs put nonce first */
2326 arc4random_buf(&nonce, sizeof(nonce));
2327 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2328 goto out;
2329
2330 /* Public key next */
2331 if ((ret = impl->funcs->serialize_public(k, cert,
2332 SSHKEY_SERIALIZE_DEFAULT)) != 0)
2333 goto out;
2334
2335 /* Then remaining cert fields */
2336 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2337 (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2338 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2339 goto out;
2340
2341 if ((principals = sshbuf_new()) == NULL) {
2342 ret = SSH_ERR_ALLOC_FAIL;
2343 goto out;
2344 }
2345 for (i = 0; i < k->cert->nprincipals; i++) {
2346 if ((ret = sshbuf_put_cstring(principals,
2347 k->cert->principals[i])) != 0)
2348 goto out;
2349 }
2350 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2351 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2352 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2353 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2354 (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2355 (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2356 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2357 goto out;
2358
2359 /* Sign the whole mess */
2360 if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2361 sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
2362 goto out;
2363 /* Check and update signature_type against what was actually used */
2364 if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
2365 goto out;
2366 if (alg != NULL && strcmp(alg, sigtype) != 0) {
2367 ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2368 goto out;
2369 }
2370 if (k->cert->signature_type == NULL) {
2371 k->cert->signature_type = sigtype;
2372 sigtype = NULL;
2373 }
2374 /* Append signature and we are done */
2375 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2376 goto out;
2377 ret = 0;
2378 out:
2379 if (ret != 0)
2380 sshbuf_reset(cert);
2381 free(sig_blob);
2382 free(ca_blob);
2383 free(sigtype);
2384 sshbuf_free(principals);
2385 return ret;
2386 }
2387
2388 static int
2389 default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
2390 const u_char *data, size_t datalen,
2391 const char *alg, const char *sk_provider, const char *sk_pin,
2392 u_int compat, void *ctx)
2393 {
2394 if (ctx != NULL)
2395 return SSH_ERR_INVALID_ARGUMENT;
2396 return sshkey_sign(key, sigp, lenp, data, datalen, alg,
2397 sk_provider, sk_pin, compat);
2398 }
2399
2400 int
2401 sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
2402 const char *sk_provider, const char *sk_pin)
2403 {
2404 return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
2405 default_key_sign, NULL);
2406 }
2407
2408 int
2409 sshkey_cert_check_authority(const struct sshkey *k,
2410 int want_host, int require_principal, int wildcard_pattern,
2411 uint64_t verify_time, const char *name, const char **reason)
2412 {
2413 u_int i, principal_matches;
2414
2415 if (reason == NULL)
2416 return SSH_ERR_INVALID_ARGUMENT;
2417 if (!sshkey_is_cert(k)) {
2418 *reason = "Key is not a certificate";
2419 return SSH_ERR_KEY_CERT_INVALID;
2420 }
2421 if (want_host) {
2422 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2423 *reason = "Certificate invalid: not a host certificate";
2424 return SSH_ERR_KEY_CERT_INVALID;
2425 }
2426 } else {
2427 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2428 *reason = "Certificate invalid: not a user certificate";
2429 return SSH_ERR_KEY_CERT_INVALID;
2430 }
2431 }
2432 if (verify_time < k->cert->valid_after) {
2433 *reason = "Certificate invalid: not yet valid";
2434 return SSH_ERR_KEY_CERT_INVALID;
2435 }
2436 if (verify_time >= k->cert->valid_before) {
2437 *reason = "Certificate invalid: expired";
2438 return SSH_ERR_KEY_CERT_INVALID;
2439 }
2440 if (k->cert->nprincipals == 0) {
2441 if (require_principal) {
2442 *reason = "Certificate lacks principal list";
2443 return SSH_ERR_KEY_CERT_INVALID;
2444 }
2445 } else if (name != NULL) {
2446 principal_matches = 0;
2447 for (i = 0; i < k->cert->nprincipals; i++) {
2448 if (wildcard_pattern) {
2449 if (match_pattern(k->cert->principals[i],
2450 name)) {
2451 principal_matches = 1;
2452 break;
2453 }
2454 } else if (strcmp(name, k->cert->principals[i]) == 0) {
2455 principal_matches = 1;
2456 break;
2457 }
2458 }
2459 if (!principal_matches) {
2460 *reason = "Certificate invalid: name is not a listed "
2461 "principal";
2462 return SSH_ERR_KEY_CERT_INVALID;
2463 }
2464 }
2465 return 0;
2466 }
2467
2468 int
2469 sshkey_cert_check_authority_now(const struct sshkey *k,
2470 int want_host, int require_principal, int wildcard_pattern,
2471 const char *name, const char **reason)
2472 {
2473 time_t now;
2474
2475 if ((now = time(NULL)) < 0) {
2476 /* yikes - system clock before epoch! */
2477 *reason = "Certificate invalid: not yet valid";
2478 return SSH_ERR_KEY_CERT_INVALID;
2479 }
2480 return sshkey_cert_check_authority(k, want_host, require_principal,
2481 wildcard_pattern, (uint64_t)now, name, reason);
2482 }
2483
2484 int
2485 sshkey_cert_check_host(const struct sshkey *key, const char *host,
2486 int wildcard_principals, const char *ca_sign_algorithms,
2487 const char **reason)
2488 {
2489 int r;
2490
2491 if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
2492 host, reason)) != 0)
2493 return r;
2494 if (sshbuf_len(key->cert->critical) != 0) {
2495 *reason = "Certificate contains unsupported critical options";
2496 return SSH_ERR_KEY_CERT_INVALID;
2497 }
2498 if (ca_sign_algorithms != NULL &&
2499 (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2500 *reason = "Certificate signed with disallowed algorithm";
2501 return SSH_ERR_KEY_CERT_INVALID;
2502 }
2503 return 0;
2504 }
2505
2506 size_t
2507 sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2508 {
2509 char from[32], to[32], ret[128];
2510
2511 *from = *to = '\0';
2512 if (cert->valid_after == 0 &&
2513 cert->valid_before == 0xffffffffffffffffULL)
2514 return strlcpy(s, "forever", l);
2515
2516 if (cert->valid_after != 0)
2517 format_absolute_time(cert->valid_after, from, sizeof(from));
2518 if (cert->valid_before != 0xffffffffffffffffULL)
2519 format_absolute_time(cert->valid_before, to, sizeof(to));
2520
2521 if (cert->valid_after == 0)
2522 snprintf(ret, sizeof(ret), "before %s", to);
2523 else if (cert->valid_before == 0xffffffffffffffffULL)
2524 snprintf(ret, sizeof(ret), "after %s", from);
2525 else
2526 snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2527
2528 return strlcpy(s, ret, l);
2529 }
2530
2531 /* Common serialization for FIDO private keys */
2532 int
2533 sshkey_serialize_private_sk(const struct sshkey *key, struct sshbuf *b)
2534 {
2535 int r;
2536
2537 if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
2538 (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
2539 (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
2540 (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2541 return r;
2542
2543 return 0;
2544 }
2545
2546 int
2547 sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
2548 enum sshkey_serialize_rep opts)
2549 {
2550 int r = SSH_ERR_INTERNAL_ERROR;
2551 int was_shielded = sshkey_is_shielded(key);
2552 struct sshbuf *b = NULL;
2553 const struct sshkey_impl *impl;
2554
2555 if ((impl = sshkey_impl_from_key(key)) == NULL)
2556 return SSH_ERR_INTERNAL_ERROR;
2557 if ((r = sshkey_unshield_private(key)) != 0)
2558 return r;
2559 if ((b = sshbuf_new()) == NULL)
2560 return SSH_ERR_ALLOC_FAIL;
2561 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2562 goto out;
2563 if (sshkey_is_cert(key)) {
2564 if (key->cert == NULL ||
2565 sshbuf_len(key->cert->certblob) == 0) {
2566 r = SSH_ERR_INVALID_ARGUMENT;
2567 goto out;
2568 }
2569 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0)
2570 goto out;
2571 }
2572 if ((r = impl->funcs->serialize_private(key, b, opts)) != 0)
2573 goto out;
2574
2575 /*
2576 * success (but we still need to append the output to buf after
2577 * possibly re-shielding the private key)
2578 */
2579 r = 0;
2580 out:
2581 if (was_shielded)
2582 r = sshkey_shield_private(key);
2583 if (r == 0)
2584 r = sshbuf_putb(buf, b);
2585 sshbuf_free(b);
2586
2587 return r;
2588 }
2589
2590 int
2591 sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
2592 {
2593 return sshkey_private_serialize_opt(key, b,
2594 SSHKEY_SERIALIZE_DEFAULT);
2595 }
2596
2597 /* Shared deserialization of FIDO private key components */
2598 int
2599 sshkey_private_deserialize_sk(struct sshbuf *buf, struct sshkey *k)
2600 {
2601 int r;
2602
2603 if ((k->sk_key_handle = sshbuf_new()) == NULL ||
2604 (k->sk_reserved = sshbuf_new()) == NULL)
2605 return SSH_ERR_ALLOC_FAIL;
2606 if ((r = sshbuf_get_cstring(buf, &k->sk_application, NULL)) != 0 ||
2607 (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
2608 (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
2609 (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2610 return r;
2611
2612 return 0;
2613 }
2614
2615 int
2616 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2617 {
2618 const struct sshkey_impl *impl;
2619 char *tname = NULL;
2620 char *expect_sk_application = NULL;
2621 u_char *expect_ed25519_pk = NULL;
2622 struct sshkey *k = NULL;
2623 int type, r = SSH_ERR_INTERNAL_ERROR;
2624
2625 if (kp != NULL)
2626 *kp = NULL;
2627 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2628 goto out;
2629 type = sshkey_type_from_name(tname);
2630 if (sshkey_type_is_cert(type)) {
2631 /*
2632 * Certificate key private keys begin with the certificate
2633 * itself. Make sure this matches the type of the enclosing
2634 * private key.
2635 */
2636 if ((r = sshkey_froms(buf, &k)) != 0)
2637 goto out;
2638 if (k->type != type) {
2639 r = SSH_ERR_KEY_CERT_MISMATCH;
2640 goto out;
2641 }
2642 /* For ECDSA keys, the group must match too */
2643 if (k->type == KEY_ECDSA &&
2644 k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2645 r = SSH_ERR_KEY_CERT_MISMATCH;
2646 goto out;
2647 }
2648 /*
2649 * Several fields are redundant between certificate and
2650 * private key body, we require these to match.
2651 */
2652 expect_sk_application = k->sk_application;
2653 expect_ed25519_pk = k->ed25519_pk;
2654 k->sk_application = NULL;
2655 k->ed25519_pk = NULL;
2656 /* XXX xmss too or refactor */
2657 } else {
2658 if ((k = sshkey_new(type)) == NULL) {
2659 r = SSH_ERR_ALLOC_FAIL;
2660 goto out;
2661 }
2662 }
2663 if ((impl = sshkey_impl_from_type(type)) == NULL) {
2664 r = SSH_ERR_INTERNAL_ERROR;
2665 goto out;
2666 }
2667 if ((r = impl->funcs->deserialize_private(tname, buf, k)) != 0)
2668 goto out;
2669
2670 /* XXX xmss too or refactor */
2671 if ((expect_sk_application != NULL && (k->sk_application == NULL ||
2672 strcmp(expect_sk_application, k->sk_application) != 0)) ||
2673 (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
2674 memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
2675 r = SSH_ERR_KEY_CERT_MISMATCH;
2676 goto out;
2677 }
2678 /* success */
2679 r = 0;
2680 if (kp != NULL) {
2681 *kp = k;
2682 k = NULL;
2683 }
2684 out:
2685 free(tname);
2686 sshkey_free(k);
2687 free(expect_sk_application);
2688 free(expect_ed25519_pk);
2689 return r;
2690 }
2691
2692 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2693 int
2694 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2695 {
2696 EC_POINT *nq = NULL;
2697 BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
2698 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2699
2700 /*
2701 * NB. This assumes OpenSSL has already verified that the public
2702 * point lies on the curve. This is done by EC_POINT_oct2point()
2703 * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2704 * reachable with public points not unmarshalled using
2705 * EC_POINT_oct2point then the caller will need to explicitly check.
2706 */
2707
2708 /* Q != infinity */
2709 if (EC_POINT_is_at_infinity(group, public))
2710 goto out;
2711
2712 if ((x = BN_new()) == NULL ||
2713 (y = BN_new()) == NULL ||
2714 (order = BN_new()) == NULL ||
2715 (tmp = BN_new()) == NULL) {
2716 ret = SSH_ERR_ALLOC_FAIL;
2717 goto out;
2718 }
2719
2720 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2721 if (EC_GROUP_get_order(group, order, NULL) != 1 ||
2722 EC_POINT_get_affine_coordinates_GFp(group, public,
2723 x, y, NULL) != 1) {
2724 ret = SSH_ERR_LIBCRYPTO_ERROR;
2725 goto out;
2726 }
2727 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2728 BN_num_bits(y) <= BN_num_bits(order) / 2)
2729 goto out;
2730
2731 /* nQ == infinity (n == order of subgroup) */
2732 if ((nq = EC_POINT_new(group)) == NULL) {
2733 ret = SSH_ERR_ALLOC_FAIL;
2734 goto out;
2735 }
2736 if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
2737 ret = SSH_ERR_LIBCRYPTO_ERROR;
2738 goto out;
2739 }
2740 if (EC_POINT_is_at_infinity(group, nq) != 1)
2741 goto out;
2742
2743 /* x < order - 1, y < order - 1 */
2744 if (!BN_sub(tmp, order, BN_value_one())) {
2745 ret = SSH_ERR_LIBCRYPTO_ERROR;
2746 goto out;
2747 }
2748 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2749 goto out;
2750 ret = 0;
2751 out:
2752 BN_clear_free(x);
2753 BN_clear_free(y);
2754 BN_clear_free(order);
2755 BN_clear_free(tmp);
2756 EC_POINT_free(nq);
2757 return ret;
2758 }
2759
2760 int
2761 sshkey_ec_validate_private(const EC_KEY *key)
2762 {
2763 BIGNUM *order = NULL, *tmp = NULL;
2764 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2765
2766 if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
2767 ret = SSH_ERR_ALLOC_FAIL;
2768 goto out;
2769 }
2770
2771 /* log2(private) > log2(order)/2 */
2772 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
2773 ret = SSH_ERR_LIBCRYPTO_ERROR;
2774 goto out;
2775 }
2776 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2777 BN_num_bits(order) / 2)
2778 goto out;
2779
2780 /* private < order - 1 */
2781 if (!BN_sub(tmp, order, BN_value_one())) {
2782 ret = SSH_ERR_LIBCRYPTO_ERROR;
2783 goto out;
2784 }
2785 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2786 goto out;
2787 ret = 0;
2788 out:
2789 BN_clear_free(order);
2790 BN_clear_free(tmp);
2791 return ret;
2792 }
2793
2794 void
2795 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2796 {
2797 BIGNUM *x = NULL, *y = NULL;
2798
2799 if (point == NULL) {
2800 fputs("point=(NULL)\n", stderr);
2801 return;
2802 }
2803 if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
2804 fprintf(stderr, "%s: BN_new failed\n", __func__);
2805 goto out;
2806 }
2807 if (EC_POINT_get_affine_coordinates_GFp(group, point,
2808 x, y, NULL) != 1) {
2809 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2810 __func__);
2811 goto out;
2812 }
2813 fputs("x=", stderr);
2814 BN_print_fp(stderr, x);
2815 fputs("\ny=", stderr);
2816 BN_print_fp(stderr, y);
2817 fputs("\n", stderr);
2818 out:
2819 BN_clear_free(x);
2820 BN_clear_free(y);
2821 }
2822
2823 void
2824 sshkey_dump_ec_key(const EC_KEY *key)
2825 {
2826 const BIGNUM *exponent;
2827
2828 sshkey_dump_ec_point(EC_KEY_get0_group(key),
2829 EC_KEY_get0_public_key(key));
2830 fputs("exponent=", stderr);
2831 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2832 fputs("(NULL)", stderr);
2833 else
2834 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2835 fputs("\n", stderr);
2836 }
2837 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2838
2839 static int
2840 sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
2841 const char *passphrase, const char *comment, const char *ciphername,
2842 int rounds)
2843 {
2844 u_char *cp, *key = NULL, *pubkeyblob = NULL;
2845 u_char salt[SALT_LEN];
2846 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2847 u_int check;
2848 int r = SSH_ERR_INTERNAL_ERROR;
2849 struct sshcipher_ctx *ciphercontext = NULL;
2850 const struct sshcipher *cipher;
2851 const char *kdfname = KDFNAME;
2852 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2853
2854 if (rounds <= 0)
2855 rounds = DEFAULT_ROUNDS;
2856 if (passphrase == NULL || !strlen(passphrase)) {
2857 ciphername = "none";
2858 kdfname = "none";
2859 } else if (ciphername == NULL)
2860 ciphername = DEFAULT_CIPHERNAME;
2861 if ((cipher = cipher_by_name(ciphername)) == NULL) {
2862 r = SSH_ERR_INVALID_ARGUMENT;
2863 goto out;
2864 }
2865
2866 if ((kdf = sshbuf_new()) == NULL ||
2867 (encoded = sshbuf_new()) == NULL ||
2868 (encrypted = sshbuf_new()) == NULL) {
2869 r = SSH_ERR_ALLOC_FAIL;
2870 goto out;
2871 }
2872 blocksize = cipher_blocksize(cipher);
2873 keylen = cipher_keylen(cipher);
2874 ivlen = cipher_ivlen(cipher);
2875 authlen = cipher_authlen(cipher);
2876 if ((key = calloc(1, keylen + ivlen)) == NULL) {
2877 r = SSH_ERR_ALLOC_FAIL;
2878 goto out;
2879 }
2880 if (strcmp(kdfname, "bcrypt") == 0) {
2881 arc4random_buf(salt, SALT_LEN);
2882 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2883 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2884 r = SSH_ERR_INVALID_ARGUMENT;
2885 goto out;
2886 }
2887 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2888 (r = sshbuf_put_u32(kdf, rounds)) != 0)
2889 goto out;
2890 } else if (strcmp(kdfname, "none") != 0) {
2891 /* Unsupported KDF type */
2892 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2893 goto out;
2894 }
2895 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2896 key + keylen, ivlen, 1)) != 0)
2897 goto out;
2898
2899 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
2900 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
2901 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
2902 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
2903 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
2904 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
2905 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
2906 goto out;
2907
2908 /* set up the buffer that will be encrypted */
2909
2910 /* Random check bytes */
2911 check = arc4random();
2912 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
2913 (r = sshbuf_put_u32(encrypted, check)) != 0)
2914 goto out;
2915
2916 /* append private key and comment*/
2917 if ((r = sshkey_private_serialize_opt(prv, encrypted,
2918 SSHKEY_SERIALIZE_FULL)) != 0 ||
2919 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
2920 goto out;
2921
2922 /* padding */
2923 i = 0;
2924 while (sshbuf_len(encrypted) % blocksize) {
2925 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
2926 goto out;
2927 }
2928
2929 /* length in destination buffer */
2930 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
2931 goto out;
2932
2933 /* encrypt */
2934 if ((r = sshbuf_reserve(encoded,
2935 sshbuf_len(encrypted) + authlen, &cp)) != 0)
2936 goto out;
2937 if ((r = cipher_crypt(ciphercontext, 0, cp,
2938 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
2939 goto out;
2940
2941 sshbuf_reset(blob);
2942
2943 /* assemble uuencoded key */
2944 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
2945 (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
2946 (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
2947 goto out;
2948
2949 /* success */
2950 r = 0;
2951
2952 out:
2953 sshbuf_free(kdf);
2954 sshbuf_free(encoded);
2955 sshbuf_free(encrypted);
2956 cipher_free(ciphercontext);
2957 explicit_bzero(salt, sizeof(salt));
2958 if (key != NULL)
2959 freezero(key, keylen + ivlen);
2960 if (pubkeyblob != NULL)
2961 freezero(pubkeyblob, pubkeylen);
2962 return r;
2963 }
2964
2965 static int
2966 private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
2967 {
2968 const u_char *cp;
2969 size_t encoded_len;
2970 int r;
2971 u_char last;
2972 struct sshbuf *encoded = NULL, *decoded = NULL;
2973
2974 if (blob == NULL || decodedp == NULL)
2975 return SSH_ERR_INVALID_ARGUMENT;
2976
2977 *decodedp = NULL;
2978
2979 if ((encoded = sshbuf_new()) == NULL ||
2980 (decoded = sshbuf_new()) == NULL) {
2981 r = SSH_ERR_ALLOC_FAIL;
2982 goto out;
2983 }
2984
2985 /* check preamble */
2986 cp = sshbuf_ptr(blob);
2987 encoded_len = sshbuf_len(blob);
2988 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
2989 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
2990 r = SSH_ERR_INVALID_FORMAT;
2991 goto out;
2992 }
2993 cp += MARK_BEGIN_LEN;
2994 encoded_len -= MARK_BEGIN_LEN;
2995
2996 /* Look for end marker, removing whitespace as we go */
2997 while (encoded_len > 0) {
2998 if (*cp != '\n' && *cp != '\r') {
2999 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3000 goto out;
3001 }
3002 last = *cp;
3003 encoded_len--;
3004 cp++;
3005 if (last == '\n') {
3006 if (encoded_len >= MARK_END_LEN &&
3007 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3008 /* \0 terminate */
3009 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3010 goto out;
3011 break;
3012 }
3013 }
3014 }
3015 if (encoded_len == 0) {
3016 r = SSH_ERR_INVALID_FORMAT;
3017 goto out;
3018 }
3019
3020 /* decode base64 */
3021 if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
3022 goto out;
3023
3024 /* check magic */
3025 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3026 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3027 r = SSH_ERR_INVALID_FORMAT;
3028 goto out;
3029 }
3030 /* success */
3031 *decodedp = decoded;
3032 decoded = NULL;
3033 r = 0;
3034 out:
3035 sshbuf_free(encoded);
3036 sshbuf_free(decoded);
3037 return r;
3038 }
3039
3040 static int
3041 private2_decrypt(struct sshbuf *decoded, const char *passphrase,
3042 struct sshbuf **decryptedp, struct sshkey **pubkeyp)
3043 {
3044 char *ciphername = NULL, *kdfname = NULL;
3045 const struct sshcipher *cipher = NULL;
3046 int r = SSH_ERR_INTERNAL_ERROR;
3047 size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3048 struct sshbuf *kdf = NULL, *decrypted = NULL;
3049 struct sshcipher_ctx *ciphercontext = NULL;
3050 struct sshkey *pubkey = NULL;
3051 u_char *key = NULL, *salt = NULL, *dp;
3052 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3053
3054 if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
3055 return SSH_ERR_INVALID_ARGUMENT;
3056
3057 *decryptedp = NULL;
3058 *pubkeyp = NULL;
3059
3060 if ((decrypted = sshbuf_new()) == NULL) {
3061 r = SSH_ERR_ALLOC_FAIL;
3062 goto out;
3063 }
3064
3065 /* parse public portion of key */
3066 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3067 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3068 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3069 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3070 (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3071 goto out;
3072
3073 if (nkeys != 1) {
3074 /* XXX only one key supported at present */
3075 r = SSH_ERR_INVALID_FORMAT;
3076 goto out;
3077 }
3078
3079 if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
3080 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3081 goto out;
3082
3083 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3084 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3085 goto out;
3086 }
3087 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3088 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3089 goto out;
3090 }
3091 if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
3092 r = SSH_ERR_INVALID_FORMAT;
3093 goto out;
3094 }
3095 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3096 strcmp(kdfname, "none") != 0) {
3097 /* passphrase required */
3098 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3099 goto out;
3100 }
3101
3102 /* check size of encrypted key blob */
3103 blocksize = cipher_blocksize(cipher);
3104 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3105 r = SSH_ERR_INVALID_FORMAT;
3106 goto out;
3107 }
3108
3109 /* setup key */
3110 keylen = cipher_keylen(cipher);
3111 ivlen = cipher_ivlen(cipher);
3112 authlen = cipher_authlen(cipher);
3113 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3114 r = SSH_ERR_ALLOC_FAIL;
3115 goto out;
3116 }
3117 if (strcmp(kdfname, "bcrypt") == 0) {
3118 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3119 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3120 goto out;
3121 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3122 key, keylen + ivlen, rounds) < 0) {
3123 r = SSH_ERR_INVALID_FORMAT;
3124 goto out;
3125 }
3126 }
3127
3128 /* check that an appropriate amount of auth data is present */
3129 if (sshbuf_len(decoded) < authlen ||
3130 sshbuf_len(decoded) - authlen < encrypted_len) {
3131 r = SSH_ERR_INVALID_FORMAT;
3132 goto out;
3133 }
3134
3135 /* decrypt private portion of key */
3136 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3137 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3138 key + keylen, ivlen, 0)) != 0)
3139 goto out;
3140 if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
3141 encrypted_len, 0, authlen)) != 0) {
3142 /* an integrity error here indicates an incorrect passphrase */
3143 if (r == SSH_ERR_MAC_INVALID)
3144 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3145 goto out;
3146 }
3147 if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
3148 goto out;
3149 /* there should be no trailing data */
3150 if (sshbuf_len(decoded) != 0) {
3151 r = SSH_ERR_INVALID_FORMAT;
3152 goto out;
3153 }
3154
3155 /* check check bytes */
3156 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3157 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3158 goto out;
3159 if (check1 != check2) {
3160 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3161 goto out;
3162 }
3163 /* success */
3164 *decryptedp = decrypted;
3165 decrypted = NULL;
3166 *pubkeyp = pubkey;
3167 pubkey = NULL;
3168 r = 0;
3169 out:
3170 cipher_free(ciphercontext);
3171 free(ciphername);
3172 free(kdfname);
3173 sshkey_free(pubkey);
3174 if (salt != NULL) {
3175 explicit_bzero(salt, slen);
3176 free(salt);
3177 }
3178 if (key != NULL) {
3179 explicit_bzero(key, keylen + ivlen);
3180 free(key);
3181 }
3182 sshbuf_free(kdf);
3183 sshbuf_free(decrypted);
3184 return r;
3185 }
3186
3187 static int
3188 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3189 struct sshkey **keyp, char **commentp)
3190 {
3191 char *comment = NULL;
3192 int r = SSH_ERR_INTERNAL_ERROR;
3193 struct sshbuf *decoded = NULL, *decrypted = NULL;
3194 struct sshkey *k = NULL, *pubkey = NULL;
3195
3196 if (keyp != NULL)
3197 *keyp = NULL;
3198 if (commentp != NULL)
3199 *commentp = NULL;
3200
3201 /* Undo base64 encoding and decrypt the private section */
3202 if ((r = private2_uudecode(blob, &decoded)) != 0 ||
3203 (r = private2_decrypt(decoded, passphrase,
3204 &decrypted, &pubkey)) != 0)
3205 goto out;
3206
3207 if (type != KEY_UNSPEC &&
3208 sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3209 r = SSH_ERR_KEY_TYPE_MISMATCH;
3210 goto out;
3211 }
3212
3213 /* Load the private key and comment */
3214 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3215 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3216 goto out;
3217
3218 /* Check deterministic padding after private section */
3219 if ((r = private2_check_padding(decrypted)) != 0)
3220 goto out;
3221
3222 /* Check that the public key in the envelope matches the private key */
3223 if (!sshkey_equal(pubkey, k)) {
3224 r = SSH_ERR_INVALID_FORMAT;
3225 goto out;
3226 }
3227
3228 /* success */
3229 r = 0;
3230 if (keyp != NULL) {
3231 *keyp = k;
3232 k = NULL;
3233 }
3234 if (commentp != NULL) {
3235 *commentp = comment;
3236 comment = NULL;
3237 }
3238 out:
3239 free(comment);
3240 sshbuf_free(decoded);
3241 sshbuf_free(decrypted);
3242 sshkey_free(k);
3243 sshkey_free(pubkey);
3244 return r;
3245 }
3246
3247 static int
3248 sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3249 struct sshkey **keyp)
3250 {
3251 int r = SSH_ERR_INTERNAL_ERROR;
3252 struct sshbuf *decoded = NULL;
3253 struct sshkey *pubkey = NULL;
3254 u_int nkeys = 0;
3255
3256 if (keyp != NULL)
3257 *keyp = NULL;
3258
3259 if ((r = private2_uudecode(blob, &decoded)) != 0)
3260 goto out;
3261 /* parse public key from unencrypted envelope */
3262 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3263 (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
3264 (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
3265 (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
3266 (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3267 goto out;
3268
3269 if (nkeys != 1) {
3270 /* XXX only one key supported at present */
3271 r = SSH_ERR_INVALID_FORMAT;
3272 goto out;
3273 }
3274
3275 /* Parse the public key */
3276 if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3277 goto out;
3278
3279 if (type != KEY_UNSPEC &&
3280 sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3281 r = SSH_ERR_KEY_TYPE_MISMATCH;
3282 goto out;
3283 }
3284
3285 /* success */
3286 r = 0;
3287 if (keyp != NULL) {
3288 *keyp = pubkey;
3289 pubkey = NULL;
3290 }
3291 out:
3292 sshbuf_free(decoded);
3293 sshkey_free(pubkey);
3294 return r;
3295 }
3296
3297 #ifdef WITH_OPENSSL
3298 /* convert SSH v2 key to PEM or PKCS#8 format */
3299 static int
3300 sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3301 int format, const char *_passphrase, const char *comment)
3302 {
3303 int was_shielded = sshkey_is_shielded(key);
3304 int success, r;
3305 int blen, len = strlen(_passphrase);
3306 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3307 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3308 char *bptr;
3309 BIO *bio = NULL;
3310 struct sshbuf *blob;
3311 EVP_PKEY *pkey = NULL;
3312
3313 if (len > 0 && len <= 4)
3314 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3315 if ((blob = sshbuf_new()) == NULL)
3316 return SSH_ERR_ALLOC_FAIL;
3317 if ((bio = BIO_new(BIO_s_mem())) == NULL) {
3318 r = SSH_ERR_ALLOC_FAIL;
3319 goto out;
3320 }
3321 if ((r = sshkey_unshield_private(key)) != 0)
3322 goto out;
3323
3324 switch (key->type) {
3325 #ifdef WITH_DSA
3326 case KEY_DSA:
3327 if (format == SSHKEY_PRIVATE_PEM) {
3328 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3329 cipher, passphrase, len, NULL, NULL);
3330 } else {
3331 if ((pkey = EVP_PKEY_new()) == NULL) {
3332 r = SSH_ERR_ALLOC_FAIL;
3333 goto out;
3334 }
3335 success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3336 }
3337 break;
3338 #endif
3339 #ifdef OPENSSL_HAS_ECC
3340 case KEY_ECDSA:
3341 if (format == SSHKEY_PRIVATE_PEM) {
3342 success = PEM_write_bio_ECPrivateKey(bio,
3343 EVP_PKEY_get0_EC_KEY(key->pkey),
3344 cipher, passphrase, len, NULL, NULL);
3345 } else {
3346 pkey = key->pkey;
3347 EVP_PKEY_up_ref(key->pkey);
3348 success = 1;
3349 }
3350 break;
3351 #endif
3352 case KEY_RSA:
3353 if (format == SSHKEY_PRIVATE_PEM) {
3354 success = PEM_write_bio_RSAPrivateKey(bio,
3355 EVP_PKEY_get0_RSA(key->pkey),
3356 cipher, passphrase, len, NULL, NULL);
3357 } else {
3358 pkey = key->pkey;
3359 EVP_PKEY_up_ref(key->pkey);
3360 success = 1;
3361 }
3362 break;
3363 default:
3364 success = 0;
3365 break;
3366 }
3367 if (success == 0) {
3368 r = SSH_ERR_LIBCRYPTO_ERROR;
3369 goto out;
3370 }
3371 if (format == SSHKEY_PRIVATE_PKCS8) {
3372 if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3373 passphrase, len, NULL, NULL)) == 0) {
3374 r = SSH_ERR_LIBCRYPTO_ERROR;
3375 goto out;
3376 }
3377 }
3378 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3379 r = SSH_ERR_INTERNAL_ERROR;
3380 goto out;
3381 }
3382 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3383 goto out;
3384 r = 0;
3385 out:
3386 if (was_shielded)
3387 r = sshkey_shield_private(key);
3388 if (r == 0)
3389 r = sshbuf_putb(buf, blob);
3390
3391 EVP_PKEY_free(pkey);
3392 sshbuf_free(blob);
3393 BIO_free(bio);
3394 return r;
3395 }
3396 #endif /* WITH_OPENSSL */
3397
3398 /* Serialise "key" to buffer "blob" */
3399 int
3400 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3401 const char *passphrase, const char *comment,
3402 int format, const char *openssh_format_cipher, int openssh_format_rounds)
3403 {
3404 switch (key->type) {
3405 #ifdef WITH_OPENSSL
3406 case KEY_DSA:
3407 case KEY_ECDSA:
3408 case KEY_RSA:
3409 break; /* see below */
3410 #endif /* WITH_OPENSSL */
3411 case KEY_ED25519:
3412 case KEY_ED25519_SK:
3413 #ifdef WITH_XMSS
3414 case KEY_XMSS:
3415 #endif /* WITH_XMSS */
3416 #ifdef WITH_OPENSSL
3417 case KEY_ECDSA_SK:
3418 #endif /* WITH_OPENSSL */
3419 return sshkey_private_to_blob2(key, blob, passphrase,
3420 comment, openssh_format_cipher, openssh_format_rounds);
3421 default:
3422 return SSH_ERR_KEY_TYPE_UNKNOWN;
3423 }
3424
3425 #ifdef WITH_OPENSSL
3426 switch (format) {
3427 case SSHKEY_PRIVATE_OPENSSH:
3428 return sshkey_private_to_blob2(key, blob, passphrase,
3429 comment, openssh_format_cipher, openssh_format_rounds);
3430 case SSHKEY_PRIVATE_PEM:
3431 case SSHKEY_PRIVATE_PKCS8:
3432 return sshkey_private_to_blob_pem_pkcs8(key, blob,
3433 format, passphrase, comment);
3434 default:
3435 return SSH_ERR_INVALID_ARGUMENT;
3436 }
3437 #endif /* WITH_OPENSSL */
3438 }
3439
3440 #ifdef WITH_OPENSSL
3441 static int
3442 translate_libcrypto_error(unsigned long pem_err)
3443 {
3444 int pem_reason = ERR_GET_REASON(pem_err);
3445
3446 switch (ERR_GET_LIB(pem_err)) {
3447 case ERR_LIB_PEM:
3448 switch (pem_reason) {
3449 case PEM_R_BAD_PASSWORD_READ:
3450 #ifdef PEM_R_PROBLEMS_GETTING_PASSWORD
3451 case PEM_R_PROBLEMS_GETTING_PASSWORD:
3452 #endif
3453 #ifdef PEM_R_BAD_DECRYPT
3454 case PEM_R_BAD_DECRYPT:
3455 #endif
3456 return SSH_ERR_KEY_WRONG_PASSPHRASE;
3457 default:
3458 return SSH_ERR_INVALID_FORMAT;
3459 }
3460 case ERR_LIB_EVP:
3461 switch (pem_reason) {
3462 #ifdef EVP_R_BAD_DECRYPT
3463 case EVP_R_BAD_DECRYPT:
3464 return SSH_ERR_KEY_WRONG_PASSPHRASE;
3465 #endif
3466 #ifdef EVP_R_BN_DECODE_ERROR
3467 case EVP_R_BN_DECODE_ERROR:
3468 #endif
3469 case EVP_R_DECODE_ERROR:
3470 #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3471 case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3472 #endif
3473 return SSH_ERR_INVALID_FORMAT;
3474 default:
3475 return SSH_ERR_LIBCRYPTO_ERROR;
3476 }
3477 case ERR_LIB_ASN1:
3478 return SSH_ERR_INVALID_FORMAT;
3479 }
3480 return SSH_ERR_LIBCRYPTO_ERROR;
3481 }
3482
3483 static void
3484 clear_libcrypto_errors(void)
3485 {
3486 while (ERR_get_error() != 0)
3487 ;
3488 }
3489
3490 /*
3491 * Translate OpenSSL error codes to determine whether
3492 * passphrase is required/incorrect.
3493 */
3494 static int
3495 convert_libcrypto_error(void)
3496 {
3497 /*
3498 * Some password errors are reported at the beginning
3499 * of the error queue.
3500 */
3501 if (translate_libcrypto_error(ERR_peek_error()) ==
3502 SSH_ERR_KEY_WRONG_PASSPHRASE)
3503 return SSH_ERR_KEY_WRONG_PASSPHRASE;
3504 return translate_libcrypto_error(ERR_peek_last_error());
3505 }
3506
3507 static int
3508 pem_passphrase_cb(char *buf, int size, int rwflag, void *u)
3509 {
3510 char *p = (char *)u;
3511 size_t len;
3512
3513 if (p == NULL || (len = strlen(p)) == 0)
3514 return -1;
3515 if (size < 0 || len > (size_t)size)
3516 return -1;
3517 memcpy(buf, p, len);
3518 return (int)len;
3519 }
3520
3521 static int
3522 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3523 const char *passphrase, struct sshkey **keyp)
3524 {
3525 EVP_PKEY *pk = NULL;
3526 struct sshkey *prv = NULL;
3527 BIO *bio = NULL;
3528 int r;
3529 RSA *rsa = NULL;
3530 EC_KEY *ecdsa = NULL;
3531
3532 if (keyp != NULL)
3533 *keyp = NULL;
3534
3535 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3536 return SSH_ERR_ALLOC_FAIL;
3537 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3538 (int)sshbuf_len(blob)) {
3539 r = SSH_ERR_ALLOC_FAIL;
3540 goto out;
3541 }
3542
3543 clear_libcrypto_errors();
3544 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, pem_passphrase_cb,
3545 (char *)passphrase)) == NULL) {
3546 /*
3547 * libcrypto may return various ASN.1 errors when attempting
3548 * to parse a key with an incorrect passphrase.
3549 * Treat all format errors as "incorrect passphrase" if a
3550 * passphrase was supplied.
3551 */
3552 if (passphrase != NULL && *passphrase != '\0')
3553 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3554 else
3555 r = convert_libcrypto_error();
3556 goto out;
3557 }
3558 if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
3559 (type == KEY_UNSPEC || type == KEY_RSA)) {
3560 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3561 r = SSH_ERR_ALLOC_FAIL;
3562 goto out;
3563 }
3564 if ((rsa = EVP_PKEY_get1_RSA(pk)) == NULL) {
3565 r = SSH_ERR_LIBCRYPTO_ERROR;
3566 goto out;
3567 }
3568 prv->type = KEY_RSA;
3569 #ifdef DEBUG_PK
3570 RSA_print_fp(stderr, rsa, 8);
3571 #endif
3572 if (RSA_blinding_on(rsa, NULL) != 1 ||
3573 EVP_PKEY_set1_RSA(pk, rsa) != 1) {
3574 r = SSH_ERR_LIBCRYPTO_ERROR;
3575 goto out;
3576 }
3577 EVP_PKEY_up_ref(pk);
3578 prv->pkey = pk;
3579 if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
3580 goto out;
3581 #ifdef WITH_DSA
3582 } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
3583 (type == KEY_UNSPEC || type == KEY_DSA)) {
3584 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3585 r = SSH_ERR_ALLOC_FAIL;
3586 goto out;
3587 }
3588 prv->dsa = EVP_PKEY_get1_DSA(pk);
3589 prv->type = KEY_DSA;
3590 #ifdef DEBUG_PK
3591 DSA_print_fp(stderr, prv->dsa, 8);
3592 #endif
3593 #endif
3594 #ifdef OPENSSL_HAS_ECC
3595 } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
3596 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3597 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3598 r = SSH_ERR_ALLOC_FAIL;
3599 goto out;
3600 }
3601 if ((prv->ecdsa_nid = sshkey_ecdsa_fixup_group(pk)) == -1 ||
3602 (ecdsa = EVP_PKEY_get1_EC_KEY(pk)) == NULL) {
3603 r = SSH_ERR_LIBCRYPTO_ERROR;
3604 goto out;
3605 }
3606 prv->type = KEY_ECDSA;
3607 if (sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3608 sshkey_ec_validate_public(EC_KEY_get0_group(ecdsa),
3609 EC_KEY_get0_public_key(ecdsa)) != 0 ||
3610 sshkey_ec_validate_private(ecdsa) != 0) {
3611 r = SSH_ERR_INVALID_FORMAT;
3612 goto out;
3613 }
3614 EVP_PKEY_up_ref(pk);
3615 prv->pkey = pk;
3616 #ifdef DEBUG_PK
3617 if (prv != NULL && prv->pkey != NULL)
3618 sshkey_dump_ec_key(EVP_PKEY_get0_EC_KEY(prv->pkey));
3619 #endif
3620 #endif /* OPENSSL_HAS_ECC */
3621 #ifdef OPENSSL_HAS_ED25519
3622 } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_ED25519 &&
3623 (type == KEY_UNSPEC || type == KEY_ED25519)) {
3624 size_t len;
3625
3626 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL ||
3627 (prv->ed25519_sk = calloc(1, ED25519_SK_SZ)) == NULL ||
3628 (prv->ed25519_pk = calloc(1, ED25519_PK_SZ)) == NULL) {
3629 r = SSH_ERR_ALLOC_FAIL;
3630 goto out;
3631 }
3632 prv->type = KEY_ED25519;
3633 len = ED25519_PK_SZ;
3634 if (!EVP_PKEY_get_raw_public_key(pk, prv->ed25519_pk, &len)) {
3635 r = SSH_ERR_LIBCRYPTO_ERROR;
3636 goto out;
3637 }
3638 if (len != ED25519_PK_SZ) {
3639 r = SSH_ERR_INVALID_FORMAT;
3640 goto out;
3641 }
3642 len = ED25519_SK_SZ - ED25519_PK_SZ;
3643 if (!EVP_PKEY_get_raw_private_key(pk, prv->ed25519_sk, &len)) {
3644 r = SSH_ERR_LIBCRYPTO_ERROR;
3645 goto out;
3646 }
3647 if (len != ED25519_SK_SZ - ED25519_PK_SZ) {
3648 r = SSH_ERR_INVALID_FORMAT;
3649 goto out;
3650 }
3651 /* Append the public key to our private key */
3652 memcpy(prv->ed25519_sk + (ED25519_SK_SZ - ED25519_PK_SZ),
3653 prv->ed25519_pk, ED25519_PK_SZ);
3654 #ifdef DEBUG_PK
3655 sshbuf_dump_data(prv->ed25519_sk, ED25519_SK_SZ, stderr);
3656 #endif
3657 #endif /* OPENSSL_HAS_ED25519 */
3658 } else {
3659 r = SSH_ERR_INVALID_FORMAT;
3660 goto out;
3661 }
3662 r = 0;
3663 if (keyp != NULL) {
3664 *keyp = prv;
3665 prv = NULL;
3666 }
3667 out:
3668 BIO_free(bio);
3669 EVP_PKEY_free(pk);
3670 RSA_free(rsa);
3671 #ifdef OPENSSL_HAS_ECC
3672 EC_KEY_free(ecdsa);
3673 #endif
3674 sshkey_free(prv);
3675 return r;
3676 }
3677 #endif /* WITH_OPENSSL */
3678
3679 int
3680 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3681 const char *passphrase, struct sshkey **keyp, char **commentp)
3682 {
3683 int r = SSH_ERR_INTERNAL_ERROR;
3684
3685 if (keyp != NULL)
3686 *keyp = NULL;
3687 if (commentp != NULL)
3688 *commentp = NULL;
3689
3690 switch (type) {
3691 case KEY_XMSS:
3692 /* No fallback for new-format-only keys */
3693 return sshkey_parse_private2(blob, type, passphrase,
3694 keyp, commentp);
3695 default:
3696 r = sshkey_parse_private2(blob, type, passphrase, keyp,
3697 commentp);
3698 /* Only fallback to PEM parser if a format error occurred. */
3699 if (r != SSH_ERR_INVALID_FORMAT)
3700 return r;
3701 #ifdef WITH_OPENSSL
3702 return sshkey_parse_private_pem_fileblob(blob, type,
3703 passphrase, keyp);
3704 #else
3705 return SSH_ERR_INVALID_FORMAT;
3706 #endif /* WITH_OPENSSL */
3707 }
3708 }
3709
3710 int
3711 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3712 struct sshkey **keyp, char **commentp)
3713 {
3714 if (keyp != NULL)
3715 *keyp = NULL;
3716 if (commentp != NULL)
3717 *commentp = NULL;
3718
3719 return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3720 passphrase, keyp, commentp);
3721 }
3722
3723 void
3724 sshkey_sig_details_free(struct sshkey_sig_details *details)
3725 {
3726 freezero(details, sizeof(*details));
3727 }
3728
3729 int
3730 sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
3731 struct sshkey **pubkeyp)
3732 {
3733 int r = SSH_ERR_INTERNAL_ERROR;
3734
3735 if (pubkeyp != NULL)
3736 *pubkeyp = NULL;
3737 /* only new-format private keys bundle a public key inside */
3738 if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
3739 return r;
3740 return 0;
3741 }
3742
3743 #ifdef WITH_XMSS
3744 /*
3745 * serialize the key with the current state and forward the state
3746 * maxsign times.
3747 */
3748 int
3749 sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
3750 u_int32_t maxsign, int printerror)
3751 {
3752 int r, rupdate;
3753
3754 if (maxsign == 0 ||
3755 sshkey_type_plain(k->type) != KEY_XMSS)
3756 return sshkey_private_serialize_opt(k, b,
3757 SSHKEY_SERIALIZE_DEFAULT);
3758 if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
3759 (r = sshkey_private_serialize_opt(k, b,
3760 SSHKEY_SERIALIZE_STATE)) != 0 ||
3761 (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3762 goto out;
3763 r = 0;
3764 out:
3765 if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
3766 if (r == 0)
3767 r = rupdate;
3768 }
3769 return r;
3770 }
3771
3772 u_int32_t
3773 sshkey_signatures_left(const struct sshkey *k)
3774 {
3775 if (sshkey_type_plain(k->type) == KEY_XMSS)
3776 return sshkey_xmss_signatures_left(k);
3777 return 0;
3778 }
3779
3780 int
3781 sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3782 {
3783 if (sshkey_type_plain(k->type) != KEY_XMSS)
3784 return SSH_ERR_INVALID_ARGUMENT;
3785 return sshkey_xmss_enable_maxsign(k, maxsign);
3786 }
3787
3788 int
3789 sshkey_set_filename(struct sshkey *k, const char *filename)
3790 {
3791 if (k == NULL)
3792 return SSH_ERR_INVALID_ARGUMENT;
3793 if (sshkey_type_plain(k->type) != KEY_XMSS)
3794 return 0;
3795 if (filename == NULL)
3796 return SSH_ERR_INVALID_ARGUMENT;
3797 if ((k->xmss_filename = strdup(filename)) == NULL)
3798 return SSH_ERR_ALLOC_FAIL;
3799 return 0;
3800 }
3801 #else
3802 int
3803 sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
3804 u_int32_t maxsign, int printerror)
3805 {
3806 return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
3807 }
3808
3809 u_int32_t
3810 sshkey_signatures_left(const struct sshkey *k)
3811 {
3812 return 0;
3813 }
3814
3815 int
3816 sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3817 {
3818 return SSH_ERR_INVALID_ARGUMENT;
3819 }
3820
3821 int
3822 sshkey_set_filename(struct sshkey *k, const char *filename)
3823 {
3824 if (k == NULL)
3825 return SSH_ERR_INVALID_ARGUMENT;
3826 return 0;
3827 }
3828 #endif /* WITH_XMSS */
Portable OpenSSH is a multi-platform compatible version of OpenBSD's OpenSSH