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kernel - CAM cleanup 3/N - Remove unnecessary mplocks
[dragonfly.git] / crypto / openssh / sshkey.c
blobc9f04cd673a0bc0f5d0712404d5229711115a30e
1 /* $OpenBSD: sshkey.c,v 1.35 2016/06/19 07:48:02 djm 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/param.h> /* MIN MAX */
31 #include <sys/types.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 <string.h>
46 #include <resolv.h>
47 #ifdef HAVE_UTIL_H
48 #include <util.h>
49 #endif /* HAVE_UTIL_H */
50
51 #include "ssh2.h"
52 #include "ssherr.h"
53 #include "misc.h"
54 #include "sshbuf.h"
55 #include "rsa.h"
56 #include "cipher.h"
57 #include "digest.h"
58 #define SSHKEY_INTERNAL
59 #include "sshkey.h"
60 #include "match.h"
61
62 /* openssh private key file format */
63 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
64 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
65 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
66 #define MARK_END_LEN (sizeof(MARK_END) - 1)
67 #define KDFNAME "bcrypt"
68 #define AUTH_MAGIC "openssh-key-v1"
69 #define SALT_LEN 16
70 #define DEFAULT_CIPHERNAME "aes256-cbc"
71 #define DEFAULT_ROUNDS 16
72
73 /* Version identification string for SSH v1 identity files. */
74 #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
75
76 static int sshkey_from_blob_internal(struct sshbuf *buf,
77 struct sshkey **keyp, int allow_cert);
78
79 /* Supported key types */
80 struct keytype {
81 const char *name;
82 const char *shortname;
83 int type;
84 int nid;
85 int cert;
86 int sigonly;
87 };
88 static const struct keytype keytypes[] = {
89 { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0, 0 },
90 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
91 KEY_ED25519_CERT, 0, 1, 0 },
92 #ifdef WITH_OPENSSL
93 { NULL, "RSA1", KEY_RSA1, 0, 0, 0 },
94 { "ssh-rsa", "RSA", KEY_RSA, 0, 0, 0 },
95 { "rsa-sha2-256", "RSA", KEY_RSA, 0, 0, 1 },
96 { "rsa-sha2-512", "RSA", KEY_RSA, 0, 0, 1 },
97 { "ssh-dss", "DSA", KEY_DSA, 0, 0, 0 },
98 # ifdef OPENSSL_HAS_ECC
99 { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
100 { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0, 0 },
101 # ifdef OPENSSL_HAS_NISTP521
102 { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0, 0 },
103 # endif /* OPENSSL_HAS_NISTP521 */
104 # endif /* OPENSSL_HAS_ECC */
105 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1, 0 },
106 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1, 0 },
107 # ifdef OPENSSL_HAS_ECC
108 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
109 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
110 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
111 KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
112 # ifdef OPENSSL_HAS_NISTP521
113 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
114 KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
115 # endif /* OPENSSL_HAS_NISTP521 */
116 # endif /* OPENSSL_HAS_ECC */
117 #endif /* WITH_OPENSSL */
118 { NULL, NULL, -1, -1, 0, 0 }
119 };
120
121 const char *
122 sshkey_type(const struct sshkey *k)
123 {
124 const struct keytype *kt;
125
126 for (kt = keytypes; kt->type != -1; kt++) {
127 if (kt->type == k->type)
128 return kt->shortname;
129 }
130 return "unknown";
131 }
132
133 static const char *
134 sshkey_ssh_name_from_type_nid(int type, int nid)
135 {
136 const struct keytype *kt;
137
138 for (kt = keytypes; kt->type != -1; kt++) {
139 if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
140 return kt->name;
141 }
142 return "ssh-unknown";
143 }
144
145 int
146 sshkey_type_is_cert(int type)
147 {
148 const struct keytype *kt;
149
150 for (kt = keytypes; kt->type != -1; kt++) {
151 if (kt->type == type)
152 return kt->cert;
153 }
154 return 0;
155 }
156
157 const char *
158 sshkey_ssh_name(const struct sshkey *k)
159 {
160 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
161 }
162
163 const char *
164 sshkey_ssh_name_plain(const struct sshkey *k)
165 {
166 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
167 k->ecdsa_nid);
168 }
169
170 int
171 sshkey_type_from_name(const char *name)
172 {
173 const struct keytype *kt;
174
175 for (kt = keytypes; kt->type != -1; kt++) {
176 /* Only allow shortname matches for plain key types */
177 if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
178 (!kt->cert && strcasecmp(kt->shortname, name) == 0))
179 return kt->type;
180 }
181 return KEY_UNSPEC;
182 }
183
184 int
185 sshkey_ecdsa_nid_from_name(const char *name)
186 {
187 const struct keytype *kt;
188
189 for (kt = keytypes; kt->type != -1; kt++) {
190 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
191 continue;
192 if (kt->name != NULL && strcmp(name, kt->name) == 0)
193 return kt->nid;
194 }
195 return -1;
196 }
197
198 char *
199 key_alg_list(int certs_only, int plain_only)
200 {
201 char *tmp, *ret = NULL;
202 size_t nlen, rlen = 0;
203 const struct keytype *kt;
204
205 for (kt = keytypes; kt->type != -1; kt++) {
206 if (kt->name == NULL || kt->sigonly)
207 continue;
208 if ((certs_only && !kt->cert) || (plain_only && kt->cert))
209 continue;
210 if (ret != NULL)
211 ret[rlen++] = '\n';
212 nlen = strlen(kt->name);
213 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
214 free(ret);
215 return NULL;
216 }
217 ret = tmp;
218 memcpy(ret + rlen, kt->name, nlen + 1);
219 rlen += nlen;
220 }
221 return ret;
222 }
223
224 int
225 sshkey_names_valid2(const char *names, int allow_wildcard)
226 {
227 char *s, *cp, *p;
228 const struct keytype *kt;
229 int type;
230
231 if (names == NULL || strcmp(names, "") == 0)
232 return 0;
233 if ((s = cp = strdup(names)) == NULL)
234 return 0;
235 for ((p = strsep(&cp, ",")); p && *p != '\0';
236 (p = strsep(&cp, ","))) {
237 type = sshkey_type_from_name(p);
238 if (type == KEY_RSA1) {
239 free(s);
240 return 0;
241 }
242 if (type == KEY_UNSPEC) {
243 if (allow_wildcard) {
244 /*
245 * Try matching key types against the string.
246 * If any has a positive or negative match then
247 * the component is accepted.
248 */
249 for (kt = keytypes; kt->type != -1; kt++) {
250 if (kt->type == KEY_RSA1)
251 continue;
252 if (match_pattern_list(kt->name,
253 p, 0) != 0)
254 break;
255 }
256 if (kt->type != -1)
257 continue;
258 }
259 free(s);
260 return 0;
261 }
262 }
263 free(s);
264 return 1;
265 }
266
267 u_int
268 sshkey_size(const struct sshkey *k)
269 {
270 switch (k->type) {
271 #ifdef WITH_OPENSSL
272 case KEY_RSA1:
273 case KEY_RSA:
274 case KEY_RSA_CERT:
275 return BN_num_bits(k->rsa->n);
276 case KEY_DSA:
277 case KEY_DSA_CERT:
278 return BN_num_bits(k->dsa->p);
279 case KEY_ECDSA:
280 case KEY_ECDSA_CERT:
281 return sshkey_curve_nid_to_bits(k->ecdsa_nid);
282 #endif /* WITH_OPENSSL */
283 case KEY_ED25519:
284 case KEY_ED25519_CERT:
285 return 256; /* XXX */
286 }
287 return 0;
288 }
289
290 static int
291 sshkey_type_is_valid_ca(int type)
292 {
293 switch (type) {
294 case KEY_RSA:
295 case KEY_DSA:
296 case KEY_ECDSA:
297 case KEY_ED25519:
298 return 1;
299 default:
300 return 0;
301 }
302 }
303
304 int
305 sshkey_is_cert(const struct sshkey *k)
306 {
307 if (k == NULL)
308 return 0;
309 return sshkey_type_is_cert(k->type);
310 }
311
312 /* Return the cert-less equivalent to a certified key type */
313 int
314 sshkey_type_plain(int type)
315 {
316 switch (type) {
317 case KEY_RSA_CERT:
318 return KEY_RSA;
319 case KEY_DSA_CERT:
320 return KEY_DSA;
321 case KEY_ECDSA_CERT:
322 return KEY_ECDSA;
323 case KEY_ED25519_CERT:
324 return KEY_ED25519;
325 default:
326 return type;
327 }
328 }
329
330 #ifdef WITH_OPENSSL
331 /* XXX: these are really begging for a table-driven approach */
332 int
333 sshkey_curve_name_to_nid(const char *name)
334 {
335 if (strcmp(name, "nistp256") == 0)
336 return NID_X9_62_prime256v1;
337 else if (strcmp(name, "nistp384") == 0)
338 return NID_secp384r1;
339 # ifdef OPENSSL_HAS_NISTP521
340 else if (strcmp(name, "nistp521") == 0)
341 return NID_secp521r1;
342 # endif /* OPENSSL_HAS_NISTP521 */
343 else
344 return -1;
345 }
346
347 u_int
348 sshkey_curve_nid_to_bits(int nid)
349 {
350 switch (nid) {
351 case NID_X9_62_prime256v1:
352 return 256;
353 case NID_secp384r1:
354 return 384;
355 # ifdef OPENSSL_HAS_NISTP521
356 case NID_secp521r1:
357 return 521;
358 # endif /* OPENSSL_HAS_NISTP521 */
359 default:
360 return 0;
361 }
362 }
363
364 int
365 sshkey_ecdsa_bits_to_nid(int bits)
366 {
367 switch (bits) {
368 case 256:
369 return NID_X9_62_prime256v1;
370 case 384:
371 return NID_secp384r1;
372 # ifdef OPENSSL_HAS_NISTP521
373 case 521:
374 return NID_secp521r1;
375 # endif /* OPENSSL_HAS_NISTP521 */
376 default:
377 return -1;
378 }
379 }
380
381 const char *
382 sshkey_curve_nid_to_name(int nid)
383 {
384 switch (nid) {
385 case NID_X9_62_prime256v1:
386 return "nistp256";
387 case NID_secp384r1:
388 return "nistp384";
389 # ifdef OPENSSL_HAS_NISTP521
390 case NID_secp521r1:
391 return "nistp521";
392 # endif /* OPENSSL_HAS_NISTP521 */
393 default:
394 return NULL;
395 }
396 }
397
398 int
399 sshkey_ec_nid_to_hash_alg(int nid)
400 {
401 int kbits = sshkey_curve_nid_to_bits(nid);
402
403 if (kbits <= 0)
404 return -1;
405
406 /* RFC5656 section 6.2.1 */
407 if (kbits <= 256)
408 return SSH_DIGEST_SHA256;
409 else if (kbits <= 384)
410 return SSH_DIGEST_SHA384;
411 else
412 return SSH_DIGEST_SHA512;
413 }
414 #endif /* WITH_OPENSSL */
415
416 static void
417 cert_free(struct sshkey_cert *cert)
418 {
419 u_int i;
420
421 if (cert == NULL)
422 return;
423 sshbuf_free(cert->certblob);
424 sshbuf_free(cert->critical);
425 sshbuf_free(cert->extensions);
426 free(cert->key_id);
427 for (i = 0; i < cert->nprincipals; i++)
428 free(cert->principals[i]);
429 free(cert->principals);
430 sshkey_free(cert->signature_key);
431 explicit_bzero(cert, sizeof(*cert));
432 free(cert);
433 }
434
435 static struct sshkey_cert *
436 cert_new(void)
437 {
438 struct sshkey_cert *cert;
439
440 if ((cert = calloc(1, sizeof(*cert))) == NULL)
441 return NULL;
442 if ((cert->certblob = sshbuf_new()) == NULL ||
443 (cert->critical = sshbuf_new()) == NULL ||
444 (cert->extensions = sshbuf_new()) == NULL) {
445 cert_free(cert);
446 return NULL;
447 }
448 cert->key_id = NULL;
449 cert->principals = NULL;
450 cert->signature_key = NULL;
451 return cert;
452 }
453
454 struct sshkey *
455 sshkey_new(int type)
456 {
457 struct sshkey *k;
458 #ifdef WITH_OPENSSL
459 RSA *rsa;
460 DSA *dsa;
461 #endif /* WITH_OPENSSL */
462
463 if ((k = calloc(1, sizeof(*k))) == NULL)
464 return NULL;
465 k->type = type;
466 k->ecdsa = NULL;
467 k->ecdsa_nid = -1;
468 k->dsa = NULL;
469 k->rsa = NULL;
470 k->cert = NULL;
471 k->ed25519_sk = NULL;
472 k->ed25519_pk = NULL;
473 switch (k->type) {
474 #ifdef WITH_OPENSSL
475 case KEY_RSA1:
476 case KEY_RSA:
477 case KEY_RSA_CERT:
478 if ((rsa = RSA_new()) == NULL ||
479 (rsa->n = BN_new()) == NULL ||
480 (rsa->e = BN_new()) == NULL) {
481 if (rsa != NULL)
482 RSA_free(rsa);
483 free(k);
484 return NULL;
485 }
486 k->rsa = rsa;
487 break;
488 case KEY_DSA:
489 case KEY_DSA_CERT:
490 if ((dsa = DSA_new()) == NULL ||
491 (dsa->p = BN_new()) == NULL ||
492 (dsa->q = BN_new()) == NULL ||
493 (dsa->g = BN_new()) == NULL ||
494 (dsa->pub_key = BN_new()) == NULL) {
495 if (dsa != NULL)
496 DSA_free(dsa);
497 free(k);
498 return NULL;
499 }
500 k->dsa = dsa;
501 break;
502 case KEY_ECDSA:
503 case KEY_ECDSA_CERT:
504 /* Cannot do anything until we know the group */
505 break;
506 #endif /* WITH_OPENSSL */
507 case KEY_ED25519:
508 case KEY_ED25519_CERT:
509 /* no need to prealloc */
510 break;
511 case KEY_UNSPEC:
512 break;
513 default:
514 free(k);
515 return NULL;
516 break;
517 }
518
519 if (sshkey_is_cert(k)) {
520 if ((k->cert = cert_new()) == NULL) {
521 sshkey_free(k);
522 return NULL;
523 }
524 }
525
526 return k;
527 }
528
529 int
530 sshkey_add_private(struct sshkey *k)
531 {
532 switch (k->type) {
533 #ifdef WITH_OPENSSL
534 case KEY_RSA1:
535 case KEY_RSA:
536 case KEY_RSA_CERT:
537 #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
538 if (bn_maybe_alloc_failed(k->rsa->d) ||
539 bn_maybe_alloc_failed(k->rsa->iqmp) ||
540 bn_maybe_alloc_failed(k->rsa->q) ||
541 bn_maybe_alloc_failed(k->rsa->p) ||
542 bn_maybe_alloc_failed(k->rsa->dmq1) ||
543 bn_maybe_alloc_failed(k->rsa->dmp1))
544 return SSH_ERR_ALLOC_FAIL;
545 break;
546 case KEY_DSA:
547 case KEY_DSA_CERT:
548 if (bn_maybe_alloc_failed(k->dsa->priv_key))
549 return SSH_ERR_ALLOC_FAIL;
550 break;
551 #undef bn_maybe_alloc_failed
552 case KEY_ECDSA:
553 case KEY_ECDSA_CERT:
554 /* Cannot do anything until we know the group */
555 break;
556 #endif /* WITH_OPENSSL */
557 case KEY_ED25519:
558 case KEY_ED25519_CERT:
559 /* no need to prealloc */
560 break;
561 case KEY_UNSPEC:
562 break;
563 default:
564 return SSH_ERR_INVALID_ARGUMENT;
565 }
566 return 0;
567 }
568
569 struct sshkey *
570 sshkey_new_private(int type)
571 {
572 struct sshkey *k = sshkey_new(type);
573
574 if (k == NULL)
575 return NULL;
576 if (sshkey_add_private(k) != 0) {
577 sshkey_free(k);
578 return NULL;
579 }
580 return k;
581 }
582
583 void
584 sshkey_free(struct sshkey *k)
585 {
586 if (k == NULL)
587 return;
588 switch (k->type) {
589 #ifdef WITH_OPENSSL
590 case KEY_RSA1:
591 case KEY_RSA:
592 case KEY_RSA_CERT:
593 if (k->rsa != NULL)
594 RSA_free(k->rsa);
595 k->rsa = NULL;
596 break;
597 case KEY_DSA:
598 case KEY_DSA_CERT:
599 if (k->dsa != NULL)
600 DSA_free(k->dsa);
601 k->dsa = NULL;
602 break;
603 # ifdef OPENSSL_HAS_ECC
604 case KEY_ECDSA:
605 case KEY_ECDSA_CERT:
606 if (k->ecdsa != NULL)
607 EC_KEY_free(k->ecdsa);
608 k->ecdsa = NULL;
609 break;
610 # endif /* OPENSSL_HAS_ECC */
611 #endif /* WITH_OPENSSL */
612 case KEY_ED25519:
613 case KEY_ED25519_CERT:
614 if (k->ed25519_pk) {
615 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
616 free(k->ed25519_pk);
617 k->ed25519_pk = NULL;
618 }
619 if (k->ed25519_sk) {
620 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
621 free(k->ed25519_sk);
622 k->ed25519_sk = NULL;
623 }
624 break;
625 case KEY_UNSPEC:
626 break;
627 default:
628 break;
629 }
630 if (sshkey_is_cert(k))
631 cert_free(k->cert);
632 explicit_bzero(k, sizeof(*k));
633 free(k);
634 }
635
636 static int
637 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
638 {
639 if (a == NULL && b == NULL)
640 return 1;
641 if (a == NULL || b == NULL)
642 return 0;
643 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
644 return 0;
645 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
646 sshbuf_len(a->certblob)) != 0)
647 return 0;
648 return 1;
649 }
650
651 /*
652 * Compare public portions of key only, allowing comparisons between
653 * certificates and plain keys too.
654 */
655 int
656 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
657 {
658 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
659 BN_CTX *bnctx;
660 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
661
662 if (a == NULL || b == NULL ||
663 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
664 return 0;
665
666 switch (a->type) {
667 #ifdef WITH_OPENSSL
668 case KEY_RSA1:
669 case KEY_RSA_CERT:
670 case KEY_RSA:
671 return a->rsa != NULL && b->rsa != NULL &&
672 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
673 BN_cmp(a->rsa->n, b->rsa->n) == 0;
674 case KEY_DSA_CERT:
675 case KEY_DSA:
676 return a->dsa != NULL && b->dsa != NULL &&
677 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
678 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
679 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
680 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
681 # ifdef OPENSSL_HAS_ECC
682 case KEY_ECDSA_CERT:
683 case KEY_ECDSA:
684 if (a->ecdsa == NULL || b->ecdsa == NULL ||
685 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
686 EC_KEY_get0_public_key(b->ecdsa) == NULL)
687 return 0;
688 if ((bnctx = BN_CTX_new()) == NULL)
689 return 0;
690 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
691 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
692 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
693 EC_KEY_get0_public_key(a->ecdsa),
694 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
695 BN_CTX_free(bnctx);
696 return 0;
697 }
698 BN_CTX_free(bnctx);
699 return 1;
700 # endif /* OPENSSL_HAS_ECC */
701 #endif /* WITH_OPENSSL */
702 case KEY_ED25519:
703 case KEY_ED25519_CERT:
704 return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
705 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
706 default:
707 return 0;
708 }
709 /* NOTREACHED */
710 }
711
712 int
713 sshkey_equal(const struct sshkey *a, const struct sshkey *b)
714 {
715 if (a == NULL || b == NULL || a->type != b->type)
716 return 0;
717 if (sshkey_is_cert(a)) {
718 if (!cert_compare(a->cert, b->cert))
719 return 0;
720 }
721 return sshkey_equal_public(a, b);
722 }
723
724 static int
725 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
726 {
727 int type, ret = SSH_ERR_INTERNAL_ERROR;
728 const char *typename;
729
730 if (key == NULL)
731 return SSH_ERR_INVALID_ARGUMENT;
732
733 if (sshkey_is_cert(key)) {
734 if (key->cert == NULL)
735 return SSH_ERR_EXPECTED_CERT;
736 if (sshbuf_len(key->cert->certblob) == 0)
737 return SSH_ERR_KEY_LACKS_CERTBLOB;
738 }
739 type = force_plain ? sshkey_type_plain(key->type) : key->type;
740 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
741
742 switch (type) {
743 #ifdef WITH_OPENSSL
744 case KEY_DSA_CERT:
745 case KEY_ECDSA_CERT:
746 case KEY_RSA_CERT:
747 #endif /* WITH_OPENSSL */
748 case KEY_ED25519_CERT:
749 /* Use the existing blob */
750 /* XXX modified flag? */
751 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
752 return ret;
753 break;
754 #ifdef WITH_OPENSSL
755 case KEY_DSA:
756 if (key->dsa == NULL)
757 return SSH_ERR_INVALID_ARGUMENT;
758 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
759 (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
760 (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
761 (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
762 (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
763 return ret;
764 break;
765 # ifdef OPENSSL_HAS_ECC
766 case KEY_ECDSA:
767 if (key->ecdsa == NULL)
768 return SSH_ERR_INVALID_ARGUMENT;
769 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
770 (ret = sshbuf_put_cstring(b,
771 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
772 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
773 return ret;
774 break;
775 # endif
776 case KEY_RSA:
777 if (key->rsa == NULL)
778 return SSH_ERR_INVALID_ARGUMENT;
779 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
780 (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
781 (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
782 return ret;
783 break;
784 #endif /* WITH_OPENSSL */
785 case KEY_ED25519:
786 if (key->ed25519_pk == NULL)
787 return SSH_ERR_INVALID_ARGUMENT;
788 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
789 (ret = sshbuf_put_string(b,
790 key->ed25519_pk, ED25519_PK_SZ)) != 0)
791 return ret;
792 break;
793 default:
794 return SSH_ERR_KEY_TYPE_UNKNOWN;
795 }
796 return 0;
797 }
798
799 int
800 sshkey_putb(const struct sshkey *key, struct sshbuf *b)
801 {
802 return to_blob_buf(key, b, 0);
803 }
804
805 int
806 sshkey_puts(const struct sshkey *key, struct sshbuf *b)
807 {
808 struct sshbuf *tmp;
809 int r;
810
811 if ((tmp = sshbuf_new()) == NULL)
812 return SSH_ERR_ALLOC_FAIL;
813 r = to_blob_buf(key, tmp, 0);
814 if (r == 0)
815 r = sshbuf_put_stringb(b, tmp);
816 sshbuf_free(tmp);
817 return r;
818 }
819
820 int
821 sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
822 {
823 return to_blob_buf(key, b, 1);
824 }
825
826 static int
827 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
828 {
829 int ret = SSH_ERR_INTERNAL_ERROR;
830 size_t len;
831 struct sshbuf *b = NULL;
832
833 if (lenp != NULL)
834 *lenp = 0;
835 if (blobp != NULL)
836 *blobp = NULL;
837 if ((b = sshbuf_new()) == NULL)
838 return SSH_ERR_ALLOC_FAIL;
839 if ((ret = to_blob_buf(key, b, force_plain)) != 0)
840 goto out;
841 len = sshbuf_len(b);
842 if (lenp != NULL)
843 *lenp = len;
844 if (blobp != NULL) {
845 if ((*blobp = malloc(len)) == NULL) {
846 ret = SSH_ERR_ALLOC_FAIL;
847 goto out;
848 }
849 memcpy(*blobp, sshbuf_ptr(b), len);
850 }
851 ret = 0;
852 out:
853 sshbuf_free(b);
854 return ret;
855 }
856
857 int
858 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
859 {
860 return to_blob(key, blobp, lenp, 0);
861 }
862
863 int
864 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
865 {
866 return to_blob(key, blobp, lenp, 1);
867 }
868
869 int
870 sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
871 u_char **retp, size_t *lenp)
872 {
873 u_char *blob = NULL, *ret = NULL;
874 size_t blob_len = 0;
875 int r = SSH_ERR_INTERNAL_ERROR;
876
877 if (retp != NULL)
878 *retp = NULL;
879 if (lenp != NULL)
880 *lenp = 0;
881 if (ssh_digest_bytes(dgst_alg) == 0) {
882 r = SSH_ERR_INVALID_ARGUMENT;
883 goto out;
884 }
885
886 if (k->type == KEY_RSA1) {
887 #ifdef WITH_OPENSSL
888 int nlen = BN_num_bytes(k->rsa->n);
889 int elen = BN_num_bytes(k->rsa->e);
890
891 blob_len = nlen + elen;
892 if (nlen >= INT_MAX - elen ||
893 (blob = malloc(blob_len)) == NULL) {
894 r = SSH_ERR_ALLOC_FAIL;
895 goto out;
896 }
897 BN_bn2bin(k->rsa->n, blob);
898 BN_bn2bin(k->rsa->e, blob + nlen);
899 #endif /* WITH_OPENSSL */
900 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
901 goto out;
902 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
903 r = SSH_ERR_ALLOC_FAIL;
904 goto out;
905 }
906 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
907 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
908 goto out;
909 /* success */
910 if (retp != NULL) {
911 *retp = ret;
912 ret = NULL;
913 }
914 if (lenp != NULL)
915 *lenp = ssh_digest_bytes(dgst_alg);
916 r = 0;
917 out:
918 free(ret);
919 if (blob != NULL) {
920 explicit_bzero(blob, blob_len);
921 free(blob);
922 }
923 return r;
924 }
925
926 static char *
927 fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
928 {
929 char *ret;
930 size_t plen = strlen(alg) + 1;
931 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
932 int r;
933
934 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
935 return NULL;
936 strlcpy(ret, alg, rlen);
937 strlcat(ret, ":", rlen);
938 if (dgst_raw_len == 0)
939 return ret;
940 if ((r = b64_ntop(dgst_raw, dgst_raw_len,
941 ret + plen, rlen - plen)) == -1) {
942 explicit_bzero(ret, rlen);
943 free(ret);
944 return NULL;
945 }
946 /* Trim padding characters from end */
947 ret[strcspn(ret, "=")] = '\0';
948 return ret;
949 }
950
951 static char *
952 fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
953 {
954 char *retval, hex[5];
955 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
956
957 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
958 return NULL;
959 strlcpy(retval, alg, rlen);
960 strlcat(retval, ":", rlen);
961 for (i = 0; i < dgst_raw_len; i++) {
962 snprintf(hex, sizeof(hex), "%s%02x",
963 i > 0 ? ":" : "", dgst_raw[i]);
964 strlcat(retval, hex, rlen);
965 }
966 return retval;
967 }
968
969 static char *
970 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
971 {
972 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
973 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
974 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
975 u_int i, j = 0, rounds, seed = 1;
976 char *retval;
977
978 rounds = (dgst_raw_len / 2) + 1;
979 if ((retval = calloc(rounds, 6)) == NULL)
980 return NULL;
981 retval[j++] = 'x';
982 for (i = 0; i < rounds; i++) {
983 u_int idx0, idx1, idx2, idx3, idx4;
984 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
985 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
986 seed) % 6;
987 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
988 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
989 (seed / 6)) % 6;
990 retval[j++] = vowels[idx0];
991 retval[j++] = consonants[idx1];
992 retval[j++] = vowels[idx2];
993 if ((i + 1) < rounds) {
994 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
995 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
996 retval[j++] = consonants[idx3];
997 retval[j++] = '-';
998 retval[j++] = consonants[idx4];
999 seed = ((seed * 5) +
1000 ((((u_int)(dgst_raw[2 * i])) * 7) +
1001 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1002 }
1003 } else {
1004 idx0 = seed % 6;
1005 idx1 = 16;
1006 idx2 = seed / 6;
1007 retval[j++] = vowels[idx0];
1008 retval[j++] = consonants[idx1];
1009 retval[j++] = vowels[idx2];
1010 }
1011 }
1012 retval[j++] = 'x';
1013 retval[j++] = '\0';
1014 return retval;
1015 }
1016
1017 /*
1018 * Draw an ASCII-Art representing the fingerprint so human brain can
1019 * profit from its built-in pattern recognition ability.
1020 * This technique is called "random art" and can be found in some
1021 * scientific publications like this original paper:
1022 *
1023 * "Hash Visualization: a New Technique to improve Real-World Security",
1024 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1025 * Techniques and E-Commerce (CrypTEC '99)
1026 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1027 *
1028 * The subject came up in a talk by Dan Kaminsky, too.
1029 *
1030 * If you see the picture is different, the key is different.
1031 * If the picture looks the same, you still know nothing.
1032 *
1033 * The algorithm used here is a worm crawling over a discrete plane,
1034 * leaving a trace (augmenting the field) everywhere it goes.
1035 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1036 * makes the respective movement vector be ignored for this turn.
1037 * Graphs are not unambiguous, because circles in graphs can be
1038 * walked in either direction.
1039 */
1040
1041 /*
1042 * Field sizes for the random art. Have to be odd, so the starting point
1043 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1044 * Else pictures would be too dense, and drawing the frame would
1045 * fail, too, because the key type would not fit in anymore.
1046 */
1047 #define FLDBASE 8
1048 #define FLDSIZE_Y (FLDBASE + 1)
1049 #define FLDSIZE_X (FLDBASE * 2 + 1)
1050 static char *
1051 fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1052 const struct sshkey *k)
1053 {
1054 /*
1055 * Chars to be used after each other every time the worm
1056 * intersects with itself. Matter of taste.
1057 */
1058 char *augmentation_string = " .o+=*BOX@%&#/^SE";
1059 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1060 u_char field[FLDSIZE_X][FLDSIZE_Y];
1061 size_t i, tlen, hlen;
1062 u_int b;
1063 int x, y, r;
1064 size_t len = strlen(augmentation_string) - 1;
1065
1066 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1067 return NULL;
1068
1069 /* initialize field */
1070 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1071 x = FLDSIZE_X / 2;
1072 y = FLDSIZE_Y / 2;
1073
1074 /* process raw key */
1075 for (i = 0; i < dgst_raw_len; i++) {
1076 int input;
1077 /* each byte conveys four 2-bit move commands */
1078 input = dgst_raw[i];
1079 for (b = 0; b < 4; b++) {
1080 /* evaluate 2 bit, rest is shifted later */
1081 x += (input & 0x1) ? 1 : -1;
1082 y += (input & 0x2) ? 1 : -1;
1083
1084 /* assure we are still in bounds */
1085 x = MAX(x, 0);
1086 y = MAX(y, 0);
1087 x = MIN(x, FLDSIZE_X - 1);
1088 y = MIN(y, FLDSIZE_Y - 1);
1089
1090 /* augment the field */
1091 if (field[x][y] < len - 2)
1092 field[x][y]++;
1093 input = input >> 2;
1094 }
1095 }
1096
1097 /* mark starting point and end point*/
1098 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1099 field[x][y] = len;
1100
1101 /* assemble title */
1102 r = snprintf(title, sizeof(title), "[%s %u]",
1103 sshkey_type(k), sshkey_size(k));
1104 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1105 if (r < 0 || r > (int)sizeof(title))
1106 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1107 tlen = (r <= 0) ? 0 : strlen(title);
1108
1109 /* assemble hash ID. */
1110 r = snprintf(hash, sizeof(hash), "[%s]", alg);
1111 hlen = (r <= 0) ? 0 : strlen(hash);
1112
1113 /* output upper border */
1114 p = retval;
1115 *p++ = '+';
1116 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1117 *p++ = '-';
1118 memcpy(p, title, tlen);
1119 p += tlen;
1120 for (i += tlen; i < FLDSIZE_X; i++)
1121 *p++ = '-';
1122 *p++ = '+';
1123 *p++ = '\n';
1124
1125 /* output content */
1126 for (y = 0; y < FLDSIZE_Y; y++) {
1127 *p++ = '|';
1128 for (x = 0; x < FLDSIZE_X; x++)
1129 *p++ = augmentation_string[MIN(field[x][y], len)];
1130 *p++ = '|';
1131 *p++ = '\n';
1132 }
1133
1134 /* output lower border */
1135 *p++ = '+';
1136 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1137 *p++ = '-';
1138 memcpy(p, hash, hlen);
1139 p += hlen;
1140 for (i += hlen; i < FLDSIZE_X; i++)
1141 *p++ = '-';
1142 *p++ = '+';
1143
1144 return retval;
1145 }
1146
1147 char *
1148 sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1149 enum sshkey_fp_rep dgst_rep)
1150 {
1151 char *retval = NULL;
1152 u_char *dgst_raw;
1153 size_t dgst_raw_len;
1154
1155 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1156 return NULL;
1157 switch (dgst_rep) {
1158 case SSH_FP_DEFAULT:
1159 if (dgst_alg == SSH_DIGEST_MD5) {
1160 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1161 dgst_raw, dgst_raw_len);
1162 } else {
1163 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1164 dgst_raw, dgst_raw_len);
1165 }
1166 break;
1167 case SSH_FP_HEX:
1168 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1169 dgst_raw, dgst_raw_len);
1170 break;
1171 case SSH_FP_BASE64:
1172 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1173 dgst_raw, dgst_raw_len);
1174 break;
1175 case SSH_FP_BUBBLEBABBLE:
1176 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1177 break;
1178 case SSH_FP_RANDOMART:
1179 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1180 dgst_raw, dgst_raw_len, k);
1181 break;
1182 default:
1183 explicit_bzero(dgst_raw, dgst_raw_len);
1184 free(dgst_raw);
1185 return NULL;
1186 }
1187 explicit_bzero(dgst_raw, dgst_raw_len);
1188 free(dgst_raw);
1189 return retval;
1190 }
1191
1192 #ifdef WITH_SSH1
1193 /*
1194 * Reads a multiple-precision integer in decimal from the buffer, and advances
1195 * the pointer. The integer must already be initialized. This function is
1196 * permitted to modify the buffer. This leaves *cpp to point just beyond the
1197 * last processed character.
1198 */
1199 static int
1200 read_decimal_bignum(char **cpp, BIGNUM *v)
1201 {
1202 char *cp;
1203 size_t e;
1204 int skip = 1; /* skip white space */
1205
1206 cp = *cpp;
1207 while (*cp == ' ' || *cp == '\t')
1208 cp++;
1209 e = strspn(cp, "0123456789");
1210 if (e == 0)
1211 return SSH_ERR_INVALID_FORMAT;
1212 if (e > SSHBUF_MAX_BIGNUM * 3)
1213 return SSH_ERR_BIGNUM_TOO_LARGE;
1214 if (cp[e] == '\0')
1215 skip = 0;
1216 else if (strchr(" \t\r\n", cp[e]) == NULL)
1217 return SSH_ERR_INVALID_FORMAT;
1218 cp[e] = '\0';
1219 if (BN_dec2bn(&v, cp) <= 0)
1220 return SSH_ERR_INVALID_FORMAT;
1221 *cpp = cp + e + skip;
1222 return 0;
1223 }
1224 #endif /* WITH_SSH1 */
1225
1226 /* returns 0 ok, and < 0 error */
1227 int
1228 sshkey_read(struct sshkey *ret, char **cpp)
1229 {
1230 struct sshkey *k;
1231 int retval = SSH_ERR_INVALID_FORMAT;
1232 char *ep, *cp, *space;
1233 int r, type, curve_nid = -1;
1234 struct sshbuf *blob;
1235 #ifdef WITH_SSH1
1236 u_long bits;
1237 #endif /* WITH_SSH1 */
1238
1239 cp = *cpp;
1240
1241 switch (ret->type) {
1242 case KEY_RSA1:
1243 #ifdef WITH_SSH1
1244 /* Get number of bits. */
1245 bits = strtoul(cp, &ep, 10);
1246 if (*cp == '\0' || strchr(" \t\r\n", *ep) == NULL ||
1247 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1248 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1249 /* Get public exponent, public modulus. */
1250 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1251 return r;
1252 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1253 return r;
1254 /* validate the claimed number of bits */
1255 if (BN_num_bits(ret->rsa->n) != (int)bits)
1256 return SSH_ERR_KEY_BITS_MISMATCH;
1257 *cpp = ep;
1258 retval = 0;
1259 #endif /* WITH_SSH1 */
1260 break;
1261 case KEY_UNSPEC:
1262 case KEY_RSA:
1263 case KEY_DSA:
1264 case KEY_ECDSA:
1265 case KEY_ED25519:
1266 case KEY_DSA_CERT:
1267 case KEY_ECDSA_CERT:
1268 case KEY_RSA_CERT:
1269 case KEY_ED25519_CERT:
1270 space = strchr(cp, ' ');
1271 if (space == NULL)
1272 return SSH_ERR_INVALID_FORMAT;
1273 *space = '\0';
1274 type = sshkey_type_from_name(cp);
1275 if (sshkey_type_plain(type) == KEY_ECDSA &&
1276 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1277 return SSH_ERR_EC_CURVE_INVALID;
1278 *space = ' ';
1279 if (type == KEY_UNSPEC)
1280 return SSH_ERR_INVALID_FORMAT;
1281 cp = space+1;
1282 if (*cp == '\0')
1283 return SSH_ERR_INVALID_FORMAT;
1284 if (ret->type != KEY_UNSPEC && ret->type != type)
1285 return SSH_ERR_KEY_TYPE_MISMATCH;
1286 if ((blob = sshbuf_new()) == NULL)
1287 return SSH_ERR_ALLOC_FAIL;
1288 /* trim comment */
1289 space = strchr(cp, ' ');
1290 if (space) {
1291 /* advance 'space': skip whitespace */
1292 *space++ = '\0';
1293 while (*space == ' ' || *space == '\t')
1294 space++;
1295 ep = space;
1296 } else
1297 ep = cp + strlen(cp);
1298 if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1299 sshbuf_free(blob);
1300 return r;
1301 }
1302 if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1303 sshbuf_len(blob), &k)) != 0) {
1304 sshbuf_free(blob);
1305 return r;
1306 }
1307 sshbuf_free(blob);
1308 if (k->type != type) {
1309 sshkey_free(k);
1310 return SSH_ERR_KEY_TYPE_MISMATCH;
1311 }
1312 if (sshkey_type_plain(type) == KEY_ECDSA &&
1313 curve_nid != k->ecdsa_nid) {
1314 sshkey_free(k);
1315 return SSH_ERR_EC_CURVE_MISMATCH;
1316 }
1317 ret->type = type;
1318 if (sshkey_is_cert(ret)) {
1319 if (!sshkey_is_cert(k)) {
1320 sshkey_free(k);
1321 return SSH_ERR_EXPECTED_CERT;
1322 }
1323 if (ret->cert != NULL)
1324 cert_free(ret->cert);
1325 ret->cert = k->cert;
1326 k->cert = NULL;
1327 }
1328 switch (sshkey_type_plain(ret->type)) {
1329 #ifdef WITH_OPENSSL
1330 case KEY_RSA:
1331 if (ret->rsa != NULL)
1332 RSA_free(ret->rsa);
1333 ret->rsa = k->rsa;
1334 k->rsa = NULL;
1335 #ifdef DEBUG_PK
1336 RSA_print_fp(stderr, ret->rsa, 8);
1337 #endif
1338 break;
1339 case KEY_DSA:
1340 if (ret->dsa != NULL)
1341 DSA_free(ret->dsa);
1342 ret->dsa = k->dsa;
1343 k->dsa = NULL;
1344 #ifdef DEBUG_PK
1345 DSA_print_fp(stderr, ret->dsa, 8);
1346 #endif
1347 break;
1348 # ifdef OPENSSL_HAS_ECC
1349 case KEY_ECDSA:
1350 if (ret->ecdsa != NULL)
1351 EC_KEY_free(ret->ecdsa);
1352 ret->ecdsa = k->ecdsa;
1353 ret->ecdsa_nid = k->ecdsa_nid;
1354 k->ecdsa = NULL;
1355 k->ecdsa_nid = -1;
1356 #ifdef DEBUG_PK
1357 sshkey_dump_ec_key(ret->ecdsa);
1358 #endif
1359 break;
1360 # endif /* OPENSSL_HAS_ECC */
1361 #endif /* WITH_OPENSSL */
1362 case KEY_ED25519:
1363 free(ret->ed25519_pk);
1364 ret->ed25519_pk = k->ed25519_pk;
1365 k->ed25519_pk = NULL;
1366 #ifdef DEBUG_PK
1367 /* XXX */
1368 #endif
1369 break;
1370 }
1371 *cpp = ep;
1372 retval = 0;
1373 /*XXXX*/
1374 sshkey_free(k);
1375 if (retval != 0)
1376 break;
1377 break;
1378 default:
1379 return SSH_ERR_INVALID_ARGUMENT;
1380 }
1381 return retval;
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(b)) == 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 static int
1414 sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
1415 {
1416 int r = SSH_ERR_INTERNAL_ERROR;
1417 #ifdef WITH_SSH1
1418 u_int bits = 0;
1419 char *dec_e = NULL, *dec_n = NULL;
1420
1421 if (key->rsa == NULL || key->rsa->e == NULL ||
1422 key->rsa->n == NULL) {
1423 r = SSH_ERR_INVALID_ARGUMENT;
1424 goto out;
1425 }
1426 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1427 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1428 r = SSH_ERR_ALLOC_FAIL;
1429 goto out;
1430 }
1431 /* size of modulus 'n' */
1432 if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1433 r = SSH_ERR_INVALID_ARGUMENT;
1434 goto out;
1435 }
1436 if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1437 goto out;
1438
1439 /* Success */
1440 r = 0;
1441 out:
1442 if (dec_e != NULL)
1443 OPENSSL_free(dec_e);
1444 if (dec_n != NULL)
1445 OPENSSL_free(dec_n);
1446 #endif /* WITH_SSH1 */
1447
1448 return r;
1449 }
1450
1451 static int
1452 sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1453 {
1454 int r = SSH_ERR_INTERNAL_ERROR;
1455 char *uu = NULL;
1456
1457 if (key->type == KEY_RSA1) {
1458 if ((r = sshkey_format_rsa1(key, b)) != 0)
1459 goto out;
1460 } else {
1461 /* Unsupported key types handled in sshkey_to_base64() */
1462 if ((r = sshkey_to_base64(key, &uu)) != 0)
1463 goto out;
1464 if ((r = sshbuf_putf(b, "%s %s",
1465 sshkey_ssh_name(key), uu)) != 0)
1466 goto out;
1467 }
1468 r = 0;
1469 out:
1470 free(uu);
1471 return r;
1472 }
1473
1474 int
1475 sshkey_write(const struct sshkey *key, FILE *f)
1476 {
1477 struct sshbuf *b = NULL;
1478 int r = SSH_ERR_INTERNAL_ERROR;
1479
1480 if ((b = sshbuf_new()) == NULL)
1481 return SSH_ERR_ALLOC_FAIL;
1482 if ((r = sshkey_format_text(key, b)) != 0)
1483 goto out;
1484 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1485 if (feof(f))
1486 errno = EPIPE;
1487 r = SSH_ERR_SYSTEM_ERROR;
1488 goto out;
1489 }
1490 /* Success */
1491 r = 0;
1492 out:
1493 sshbuf_free(b);
1494 return r;
1495 }
1496
1497 const char *
1498 sshkey_cert_type(const struct sshkey *k)
1499 {
1500 switch (k->cert->type) {
1501 case SSH2_CERT_TYPE_USER:
1502 return "user";
1503 case SSH2_CERT_TYPE_HOST:
1504 return "host";
1505 default:
1506 return "unknown";
1507 }
1508 }
1509
1510 #ifdef WITH_OPENSSL
1511 static int
1512 rsa_generate_private_key(u_int bits, RSA **rsap)
1513 {
1514 RSA *private = NULL;
1515 BIGNUM *f4 = NULL;
1516 int ret = SSH_ERR_INTERNAL_ERROR;
1517
1518 if (rsap == NULL ||
1519 bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1520 bits > SSHBUF_MAX_BIGNUM * 8)
1521 return SSH_ERR_INVALID_ARGUMENT;
1522 *rsap = NULL;
1523 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1524 ret = SSH_ERR_ALLOC_FAIL;
1525 goto out;
1526 }
1527 if (!BN_set_word(f4, RSA_F4) ||
1528 !RSA_generate_key_ex(private, bits, f4, NULL)) {
1529 ret = SSH_ERR_LIBCRYPTO_ERROR;
1530 goto out;
1531 }
1532 *rsap = private;
1533 private = NULL;
1534 ret = 0;
1535 out:
1536 if (private != NULL)
1537 RSA_free(private);
1538 if (f4 != NULL)
1539 BN_free(f4);
1540 return ret;
1541 }
1542
1543 static int
1544 dsa_generate_private_key(u_int bits, DSA **dsap)
1545 {
1546 DSA *private;
1547 int ret = SSH_ERR_INTERNAL_ERROR;
1548
1549 if (dsap == NULL || bits != 1024)
1550 return SSH_ERR_INVALID_ARGUMENT;
1551 if ((private = DSA_new()) == NULL) {
1552 ret = SSH_ERR_ALLOC_FAIL;
1553 goto out;
1554 }
1555 *dsap = NULL;
1556 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1557 NULL, NULL) || !DSA_generate_key(private)) {
1558 ret = SSH_ERR_LIBCRYPTO_ERROR;
1559 goto out;
1560 }
1561 *dsap = private;
1562 private = NULL;
1563 ret = 0;
1564 out:
1565 if (private != NULL)
1566 DSA_free(private);
1567 return ret;
1568 }
1569
1570 # ifdef OPENSSL_HAS_ECC
1571 int
1572 sshkey_ecdsa_key_to_nid(EC_KEY *k)
1573 {
1574 EC_GROUP *eg;
1575 int nids[] = {
1576 NID_X9_62_prime256v1,
1577 NID_secp384r1,
1578 # ifdef OPENSSL_HAS_NISTP521
1579 NID_secp521r1,
1580 # endif /* OPENSSL_HAS_NISTP521 */
1581 -1
1582 };
1583 int nid;
1584 u_int i;
1585 BN_CTX *bnctx;
1586 const EC_GROUP *g = EC_KEY_get0_group(k);
1587
1588 /*
1589 * The group may be stored in a ASN.1 encoded private key in one of two
1590 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1591 * or explicit group parameters encoded into the key blob. Only the
1592 * "named group" case sets the group NID for us, but we can figure
1593 * it out for the other case by comparing against all the groups that
1594 * are supported.
1595 */
1596 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1597 return nid;
1598 if ((bnctx = BN_CTX_new()) == NULL)
1599 return -1;
1600 for (i = 0; nids[i] != -1; i++) {
1601 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1602 BN_CTX_free(bnctx);
1603 return -1;
1604 }
1605 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1606 break;
1607 EC_GROUP_free(eg);
1608 }
1609 BN_CTX_free(bnctx);
1610 if (nids[i] != -1) {
1611 /* Use the group with the NID attached */
1612 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1613 if (EC_KEY_set_group(k, eg) != 1) {
1614 EC_GROUP_free(eg);
1615 return -1;
1616 }
1617 }
1618 return nids[i];
1619 }
1620
1621 static int
1622 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1623 {
1624 EC_KEY *private;
1625 int ret = SSH_ERR_INTERNAL_ERROR;
1626
1627 if (nid == NULL || ecdsap == NULL ||
1628 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1629 return SSH_ERR_INVALID_ARGUMENT;
1630 *ecdsap = NULL;
1631 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1632 ret = SSH_ERR_ALLOC_FAIL;
1633 goto out;
1634 }
1635 if (EC_KEY_generate_key(private) != 1) {
1636 ret = SSH_ERR_LIBCRYPTO_ERROR;
1637 goto out;
1638 }
1639 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1640 *ecdsap = private;
1641 private = NULL;
1642 ret = 0;
1643 out:
1644 if (private != NULL)
1645 EC_KEY_free(private);
1646 return ret;
1647 }
1648 # endif /* OPENSSL_HAS_ECC */
1649 #endif /* WITH_OPENSSL */
1650
1651 int
1652 sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1653 {
1654 struct sshkey *k;
1655 int ret = SSH_ERR_INTERNAL_ERROR;
1656
1657 if (keyp == NULL)
1658 return SSH_ERR_INVALID_ARGUMENT;
1659 *keyp = NULL;
1660 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1661 return SSH_ERR_ALLOC_FAIL;
1662 switch (type) {
1663 case KEY_ED25519:
1664 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1665 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1666 ret = SSH_ERR_ALLOC_FAIL;
1667 break;
1668 }
1669 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1670 ret = 0;
1671 break;
1672 #ifdef WITH_OPENSSL
1673 case KEY_DSA:
1674 ret = dsa_generate_private_key(bits, &k->dsa);
1675 break;
1676 # ifdef OPENSSL_HAS_ECC
1677 case KEY_ECDSA:
1678 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1679 &k->ecdsa);
1680 break;
1681 # endif /* OPENSSL_HAS_ECC */
1682 case KEY_RSA:
1683 case KEY_RSA1:
1684 ret = rsa_generate_private_key(bits, &k->rsa);
1685 break;
1686 #endif /* WITH_OPENSSL */
1687 default:
1688 ret = SSH_ERR_INVALID_ARGUMENT;
1689 }
1690 if (ret == 0) {
1691 k->type = type;
1692 *keyp = k;
1693 } else
1694 sshkey_free(k);
1695 return ret;
1696 }
1697
1698 int
1699 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1700 {
1701 u_int i;
1702 const struct sshkey_cert *from;
1703 struct sshkey_cert *to;
1704 int ret = SSH_ERR_INTERNAL_ERROR;
1705
1706 if (to_key->cert != NULL) {
1707 cert_free(to_key->cert);
1708 to_key->cert = NULL;
1709 }
1710
1711 if ((from = from_key->cert) == NULL)
1712 return SSH_ERR_INVALID_ARGUMENT;
1713
1714 if ((to = to_key->cert = cert_new()) == NULL)
1715 return SSH_ERR_ALLOC_FAIL;
1716
1717 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1718 (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1719 (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1720 return ret;
1721
1722 to->serial = from->serial;
1723 to->type = from->type;
1724 if (from->key_id == NULL)
1725 to->key_id = NULL;
1726 else if ((to->key_id = strdup(from->key_id)) == NULL)
1727 return SSH_ERR_ALLOC_FAIL;
1728 to->valid_after = from->valid_after;
1729 to->valid_before = from->valid_before;
1730 if (from->signature_key == NULL)
1731 to->signature_key = NULL;
1732 else if ((ret = sshkey_from_private(from->signature_key,
1733 &to->signature_key)) != 0)
1734 return ret;
1735
1736 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1737 return SSH_ERR_INVALID_ARGUMENT;
1738 if (from->nprincipals > 0) {
1739 if ((to->principals = calloc(from->nprincipals,
1740 sizeof(*to->principals))) == NULL)
1741 return SSH_ERR_ALLOC_FAIL;
1742 for (i = 0; i < from->nprincipals; i++) {
1743 to->principals[i] = strdup(from->principals[i]);
1744 if (to->principals[i] == NULL) {
1745 to->nprincipals = i;
1746 return SSH_ERR_ALLOC_FAIL;
1747 }
1748 }
1749 }
1750 to->nprincipals = from->nprincipals;
1751 return 0;
1752 }
1753
1754 int
1755 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1756 {
1757 struct sshkey *n = NULL;
1758 int ret = SSH_ERR_INTERNAL_ERROR;
1759
1760 *pkp = NULL;
1761 switch (k->type) {
1762 #ifdef WITH_OPENSSL
1763 case KEY_DSA:
1764 case KEY_DSA_CERT:
1765 if ((n = sshkey_new(k->type)) == NULL)
1766 return SSH_ERR_ALLOC_FAIL;
1767 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1768 (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1769 (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1770 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1771 sshkey_free(n);
1772 return SSH_ERR_ALLOC_FAIL;
1773 }
1774 break;
1775 # ifdef OPENSSL_HAS_ECC
1776 case KEY_ECDSA:
1777 case KEY_ECDSA_CERT:
1778 if ((n = sshkey_new(k->type)) == NULL)
1779 return SSH_ERR_ALLOC_FAIL;
1780 n->ecdsa_nid = k->ecdsa_nid;
1781 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1782 if (n->ecdsa == NULL) {
1783 sshkey_free(n);
1784 return SSH_ERR_ALLOC_FAIL;
1785 }
1786 if (EC_KEY_set_public_key(n->ecdsa,
1787 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1788 sshkey_free(n);
1789 return SSH_ERR_LIBCRYPTO_ERROR;
1790 }
1791 break;
1792 # endif /* OPENSSL_HAS_ECC */
1793 case KEY_RSA:
1794 case KEY_RSA1:
1795 case KEY_RSA_CERT:
1796 if ((n = sshkey_new(k->type)) == NULL)
1797 return SSH_ERR_ALLOC_FAIL;
1798 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1799 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1800 sshkey_free(n);
1801 return SSH_ERR_ALLOC_FAIL;
1802 }
1803 break;
1804 #endif /* WITH_OPENSSL */
1805 case KEY_ED25519:
1806 case KEY_ED25519_CERT:
1807 if ((n = sshkey_new(k->type)) == NULL)
1808 return SSH_ERR_ALLOC_FAIL;
1809 if (k->ed25519_pk != NULL) {
1810 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1811 sshkey_free(n);
1812 return SSH_ERR_ALLOC_FAIL;
1813 }
1814 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1815 }
1816 break;
1817 default:
1818 return SSH_ERR_KEY_TYPE_UNKNOWN;
1819 }
1820 if (sshkey_is_cert(k)) {
1821 if ((ret = sshkey_cert_copy(k, n)) != 0) {
1822 sshkey_free(n);
1823 return ret;
1824 }
1825 }
1826 *pkp = n;
1827 return 0;
1828 }
1829
1830 static int
1831 cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1832 {
1833 struct sshbuf *principals = NULL, *crit = NULL;
1834 struct sshbuf *exts = NULL, *ca = NULL;
1835 u_char *sig = NULL;
1836 size_t signed_len = 0, slen = 0, kidlen = 0;
1837 int ret = SSH_ERR_INTERNAL_ERROR;
1838
1839 /* Copy the entire key blob for verification and later serialisation */
1840 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1841 return ret;
1842
1843 /* Parse body of certificate up to signature */
1844 if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1845 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1846 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1847 (ret = sshbuf_froms(b, &principals)) != 0 ||
1848 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1849 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1850 (ret = sshbuf_froms(b, &crit)) != 0 ||
1851 (ret = sshbuf_froms(b, &exts)) != 0 ||
1852 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1853 (ret = sshbuf_froms(b, &ca)) != 0) {
1854 /* XXX debug print error for ret */
1855 ret = SSH_ERR_INVALID_FORMAT;
1856 goto out;
1857 }
1858
1859 /* Signature is left in the buffer so we can calculate this length */
1860 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1861
1862 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1863 ret = SSH_ERR_INVALID_FORMAT;
1864 goto out;
1865 }
1866
1867 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1868 key->cert->type != SSH2_CERT_TYPE_HOST) {
1869 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1870 goto out;
1871 }
1872
1873 /* Parse principals section */
1874 while (sshbuf_len(principals) > 0) {
1875 char *principal = NULL;
1876 char **oprincipals = NULL;
1877
1878 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1879 ret = SSH_ERR_INVALID_FORMAT;
1880 goto out;
1881 }
1882 if ((ret = sshbuf_get_cstring(principals, &principal,
1883 NULL)) != 0) {
1884 ret = SSH_ERR_INVALID_FORMAT;
1885 goto out;
1886 }
1887 oprincipals = key->cert->principals;
1888 key->cert->principals = reallocarray(key->cert->principals,
1889 key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1890 if (key->cert->principals == NULL) {
1891 free(principal);
1892 key->cert->principals = oprincipals;
1893 ret = SSH_ERR_ALLOC_FAIL;
1894 goto out;
1895 }
1896 key->cert->principals[key->cert->nprincipals++] = principal;
1897 }
1898
1899 /*
1900 * Stash a copies of the critical options and extensions sections
1901 * for later use.
1902 */
1903 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1904 (exts != NULL &&
1905 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1906 goto out;
1907
1908 /*
1909 * Validate critical options and extensions sections format.
1910 */
1911 while (sshbuf_len(crit) != 0) {
1912 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1913 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1914 sshbuf_reset(key->cert->critical);
1915 ret = SSH_ERR_INVALID_FORMAT;
1916 goto out;
1917 }
1918 }
1919 while (exts != NULL && sshbuf_len(exts) != 0) {
1920 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1921 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1922 sshbuf_reset(key->cert->extensions);
1923 ret = SSH_ERR_INVALID_FORMAT;
1924 goto out;
1925 }
1926 }
1927
1928 /* Parse CA key and check signature */
1929 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1930 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1931 goto out;
1932 }
1933 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1934 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1935 goto out;
1936 }
1937 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1938 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1939 goto out;
1940
1941 /* Success */
1942 ret = 0;
1943 out:
1944 sshbuf_free(ca);
1945 sshbuf_free(crit);
1946 sshbuf_free(exts);
1947 sshbuf_free(principals);
1948 free(sig);
1949 return ret;
1950 }
1951
1952 static int
1953 sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1954 int allow_cert)
1955 {
1956 int type, ret = SSH_ERR_INTERNAL_ERROR;
1957 char *ktype = NULL, *curve = NULL;
1958 struct sshkey *key = NULL;
1959 size_t len;
1960 u_char *pk = NULL;
1961 struct sshbuf *copy;
1962 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
1963 EC_POINT *q = NULL;
1964 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
1965
1966 #ifdef DEBUG_PK /* XXX */
1967 sshbuf_dump(b, stderr);
1968 #endif
1969 if (keyp != NULL)
1970 *keyp = NULL;
1971 if ((copy = sshbuf_fromb(b)) == NULL) {
1972 ret = SSH_ERR_ALLOC_FAIL;
1973 goto out;
1974 }
1975 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1976 ret = SSH_ERR_INVALID_FORMAT;
1977 goto out;
1978 }
1979
1980 type = sshkey_type_from_name(ktype);
1981 if (!allow_cert && sshkey_type_is_cert(type)) {
1982 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1983 goto out;
1984 }
1985 switch (type) {
1986 #ifdef WITH_OPENSSL
1987 case KEY_RSA_CERT:
1988 /* Skip nonce */
1989 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1990 ret = SSH_ERR_INVALID_FORMAT;
1991 goto out;
1992 }
1993 /* FALLTHROUGH */
1994 case KEY_RSA:
1995 if ((key = sshkey_new(type)) == NULL) {
1996 ret = SSH_ERR_ALLOC_FAIL;
1997 goto out;
1998 }
1999 if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
2000 sshbuf_get_bignum2(b, key->rsa->n) != 0) {
2001 ret = SSH_ERR_INVALID_FORMAT;
2002 goto out;
2003 }
2004 #ifdef DEBUG_PK
2005 RSA_print_fp(stderr, key->rsa, 8);
2006 #endif
2007 break;
2008 case KEY_DSA_CERT:
2009 /* Skip nonce */
2010 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2011 ret = SSH_ERR_INVALID_FORMAT;
2012 goto out;
2013 }
2014 /* FALLTHROUGH */
2015 case KEY_DSA:
2016 if ((key = sshkey_new(type)) == NULL) {
2017 ret = SSH_ERR_ALLOC_FAIL;
2018 goto out;
2019 }
2020 if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
2021 sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
2022 sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
2023 sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
2024 ret = SSH_ERR_INVALID_FORMAT;
2025 goto out;
2026 }
2027 #ifdef DEBUG_PK
2028 DSA_print_fp(stderr, key->dsa, 8);
2029 #endif
2030 break;
2031 case KEY_ECDSA_CERT:
2032 /* Skip nonce */
2033 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2034 ret = SSH_ERR_INVALID_FORMAT;
2035 goto out;
2036 }
2037 /* FALLTHROUGH */
2038 # ifdef OPENSSL_HAS_ECC
2039 case KEY_ECDSA:
2040 if ((key = sshkey_new(type)) == NULL) {
2041 ret = SSH_ERR_ALLOC_FAIL;
2042 goto out;
2043 }
2044 key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
2045 if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2046 ret = SSH_ERR_INVALID_FORMAT;
2047 goto out;
2048 }
2049 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2050 ret = SSH_ERR_EC_CURVE_MISMATCH;
2051 goto out;
2052 }
2053 if (key->ecdsa != NULL)
2054 EC_KEY_free(key->ecdsa);
2055 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2056 == NULL) {
2057 ret = SSH_ERR_EC_CURVE_INVALID;
2058 goto out;
2059 }
2060 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2061 ret = SSH_ERR_ALLOC_FAIL;
2062 goto out;
2063 }
2064 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2065 ret = SSH_ERR_INVALID_FORMAT;
2066 goto out;
2067 }
2068 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2069 q) != 0) {
2070 ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2071 goto out;
2072 }
2073 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2074 /* XXX assume it is a allocation error */
2075 ret = SSH_ERR_ALLOC_FAIL;
2076 goto out;
2077 }
2078 #ifdef DEBUG_PK
2079 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2080 #endif
2081 break;
2082 # endif /* OPENSSL_HAS_ECC */
2083 #endif /* WITH_OPENSSL */
2084 case KEY_ED25519_CERT:
2085 /* Skip nonce */
2086 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2087 ret = SSH_ERR_INVALID_FORMAT;
2088 goto out;
2089 }
2090 /* FALLTHROUGH */
2091 case KEY_ED25519:
2092 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2093 goto out;
2094 if (len != ED25519_PK_SZ) {
2095 ret = SSH_ERR_INVALID_FORMAT;
2096 goto out;
2097 }
2098 if ((key = sshkey_new(type)) == NULL) {
2099 ret = SSH_ERR_ALLOC_FAIL;
2100 goto out;
2101 }
2102 key->ed25519_pk = pk;
2103 pk = NULL;
2104 break;
2105 case KEY_UNSPEC:
2106 if ((key = sshkey_new(type)) == NULL) {
2107 ret = SSH_ERR_ALLOC_FAIL;
2108 goto out;
2109 }
2110 break;
2111 default:
2112 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2113 goto out;
2114 }
2115
2116 /* Parse certificate potion */
2117 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
2118 goto out;
2119
2120 if (key != NULL && sshbuf_len(b) != 0) {
2121 ret = SSH_ERR_INVALID_FORMAT;
2122 goto out;
2123 }
2124 ret = 0;
2125 if (keyp != NULL) {
2126 *keyp = key;
2127 key = NULL;
2128 }
2129 out:
2130 sshbuf_free(copy);
2131 sshkey_free(key);
2132 free(ktype);
2133 free(curve);
2134 free(pk);
2135 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2136 if (q != NULL)
2137 EC_POINT_free(q);
2138 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2139 return ret;
2140 }
2141
2142 int
2143 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2144 {
2145 struct sshbuf *b;
2146 int r;
2147
2148 if ((b = sshbuf_from(blob, blen)) == NULL)
2149 return SSH_ERR_ALLOC_FAIL;
2150 r = sshkey_from_blob_internal(b, keyp, 1);
2151 sshbuf_free(b);
2152 return r;
2153 }
2154
2155 int
2156 sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2157 {
2158 return sshkey_from_blob_internal(b, keyp, 1);
2159 }
2160
2161 int
2162 sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2163 {
2164 struct sshbuf *b;
2165 int r;
2166
2167 if ((r = sshbuf_froms(buf, &b)) != 0)
2168 return r;
2169 r = sshkey_from_blob_internal(b, keyp, 1);
2170 sshbuf_free(b);
2171 return r;
2172 }
2173
2174 int
2175 sshkey_sign(const struct sshkey *key,
2176 u_char **sigp, size_t *lenp,
2177 const u_char *data, size_t datalen, const char *alg, u_int compat)
2178 {
2179 if (sigp != NULL)
2180 *sigp = NULL;
2181 if (lenp != NULL)
2182 *lenp = 0;
2183 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2184 return SSH_ERR_INVALID_ARGUMENT;
2185 switch (key->type) {
2186 #ifdef WITH_OPENSSL
2187 case KEY_DSA_CERT:
2188 case KEY_DSA:
2189 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2190 # ifdef OPENSSL_HAS_ECC
2191 case KEY_ECDSA_CERT:
2192 case KEY_ECDSA:
2193 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2194 # endif /* OPENSSL_HAS_ECC */
2195 case KEY_RSA_CERT:
2196 case KEY_RSA:
2197 return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2198 #endif /* WITH_OPENSSL */
2199 case KEY_ED25519:
2200 case KEY_ED25519_CERT:
2201 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2202 default:
2203 return SSH_ERR_KEY_TYPE_UNKNOWN;
2204 }
2205 }
2206
2207 /*
2208 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2209 */
2210 int
2211 sshkey_verify(const struct sshkey *key,
2212 const u_char *sig, size_t siglen,
2213 const u_char *data, size_t dlen, u_int compat)
2214 {
2215 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2216 return SSH_ERR_INVALID_ARGUMENT;
2217 switch (key->type) {
2218 #ifdef WITH_OPENSSL
2219 case KEY_DSA_CERT:
2220 case KEY_DSA:
2221 return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2222 # ifdef OPENSSL_HAS_ECC
2223 case KEY_ECDSA_CERT:
2224 case KEY_ECDSA:
2225 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2226 # endif /* OPENSSL_HAS_ECC */
2227 case KEY_RSA_CERT:
2228 case KEY_RSA:
2229 return ssh_rsa_verify(key, sig, siglen, data, dlen);
2230 #endif /* WITH_OPENSSL */
2231 case KEY_ED25519:
2232 case KEY_ED25519_CERT:
2233 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2234 default:
2235 return SSH_ERR_KEY_TYPE_UNKNOWN;
2236 }
2237 }
2238
2239 /* Converts a private to a public key */
2240 int
2241 sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2242 {
2243 struct sshkey *pk;
2244 int ret = SSH_ERR_INTERNAL_ERROR;
2245
2246 *dkp = NULL;
2247 if ((pk = calloc(1, sizeof(*pk))) == NULL)
2248 return SSH_ERR_ALLOC_FAIL;
2249 pk->type = k->type;
2250 pk->flags = k->flags;
2251 pk->ecdsa_nid = k->ecdsa_nid;
2252 pk->dsa = NULL;
2253 pk->ecdsa = NULL;
2254 pk->rsa = NULL;
2255 pk->ed25519_pk = NULL;
2256 pk->ed25519_sk = NULL;
2257
2258 switch (k->type) {
2259 #ifdef WITH_OPENSSL
2260 case KEY_RSA_CERT:
2261 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2262 goto fail;
2263 /* FALLTHROUGH */
2264 case KEY_RSA1:
2265 case KEY_RSA:
2266 if ((pk->rsa = RSA_new()) == NULL ||
2267 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2268 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2269 ret = SSH_ERR_ALLOC_FAIL;
2270 goto fail;
2271 }
2272 break;
2273 case KEY_DSA_CERT:
2274 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2275 goto fail;
2276 /* FALLTHROUGH */
2277 case KEY_DSA:
2278 if ((pk->dsa = DSA_new()) == NULL ||
2279 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2280 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2281 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2282 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2283 ret = SSH_ERR_ALLOC_FAIL;
2284 goto fail;
2285 }
2286 break;
2287 case KEY_ECDSA_CERT:
2288 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2289 goto fail;
2290 /* FALLTHROUGH */
2291 # ifdef OPENSSL_HAS_ECC
2292 case KEY_ECDSA:
2293 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2294 if (pk->ecdsa == NULL) {
2295 ret = SSH_ERR_ALLOC_FAIL;
2296 goto fail;
2297 }
2298 if (EC_KEY_set_public_key(pk->ecdsa,
2299 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2300 ret = SSH_ERR_LIBCRYPTO_ERROR;
2301 goto fail;
2302 }
2303 break;
2304 # endif /* OPENSSL_HAS_ECC */
2305 #endif /* WITH_OPENSSL */
2306 case KEY_ED25519_CERT:
2307 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2308 goto fail;
2309 /* FALLTHROUGH */
2310 case KEY_ED25519:
2311 if (k->ed25519_pk != NULL) {
2312 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2313 ret = SSH_ERR_ALLOC_FAIL;
2314 goto fail;
2315 }
2316 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2317 }
2318 break;
2319 default:
2320 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2321 fail:
2322 sshkey_free(pk);
2323 return ret;
2324 }
2325 *dkp = pk;
2326 return 0;
2327 }
2328
2329 /* Convert a plain key to their _CERT equivalent */
2330 int
2331 sshkey_to_certified(struct sshkey *k)
2332 {
2333 int newtype;
2334
2335 switch (k->type) {
2336 #ifdef WITH_OPENSSL
2337 case KEY_RSA:
2338 newtype = KEY_RSA_CERT;
2339 break;
2340 case KEY_DSA:
2341 newtype = KEY_DSA_CERT;
2342 break;
2343 case KEY_ECDSA:
2344 newtype = KEY_ECDSA_CERT;
2345 break;
2346 #endif /* WITH_OPENSSL */
2347 case KEY_ED25519:
2348 newtype = KEY_ED25519_CERT;
2349 break;
2350 default:
2351 return SSH_ERR_INVALID_ARGUMENT;
2352 }
2353 if ((k->cert = cert_new()) == NULL)
2354 return SSH_ERR_ALLOC_FAIL;
2355 k->type = newtype;
2356 return 0;
2357 }
2358
2359 /* Convert a certificate to its raw key equivalent */
2360 int
2361 sshkey_drop_cert(struct sshkey *k)
2362 {
2363 if (!sshkey_type_is_cert(k->type))
2364 return SSH_ERR_KEY_TYPE_UNKNOWN;
2365 cert_free(k->cert);
2366 k->cert = NULL;
2367 k->type = sshkey_type_plain(k->type);
2368 return 0;
2369 }
2370
2371 /* Sign a certified key, (re-)generating the signed certblob. */
2372 int
2373 sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2374 {
2375 struct sshbuf *principals = NULL;
2376 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2377 size_t i, ca_len, sig_len;
2378 int ret = SSH_ERR_INTERNAL_ERROR;
2379 struct sshbuf *cert;
2380
2381 if (k == NULL || k->cert == NULL ||
2382 k->cert->certblob == NULL || ca == NULL)
2383 return SSH_ERR_INVALID_ARGUMENT;
2384 if (!sshkey_is_cert(k))
2385 return SSH_ERR_KEY_TYPE_UNKNOWN;
2386 if (!sshkey_type_is_valid_ca(ca->type))
2387 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2388
2389 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2390 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2391
2392 cert = k->cert->certblob; /* for readability */
2393 sshbuf_reset(cert);
2394 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2395 goto out;
2396
2397 /* -v01 certs put nonce first */
2398 arc4random_buf(&nonce, sizeof(nonce));
2399 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2400 goto out;
2401
2402 /* XXX this substantially duplicates to_blob(); refactor */
2403 switch (k->type) {
2404 #ifdef WITH_OPENSSL
2405 case KEY_DSA_CERT:
2406 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2407 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2408 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2409 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2410 goto out;
2411 break;
2412 # ifdef OPENSSL_HAS_ECC
2413 case KEY_ECDSA_CERT:
2414 if ((ret = sshbuf_put_cstring(cert,
2415 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2416 (ret = sshbuf_put_ec(cert,
2417 EC_KEY_get0_public_key(k->ecdsa),
2418 EC_KEY_get0_group(k->ecdsa))) != 0)
2419 goto out;
2420 break;
2421 # endif /* OPENSSL_HAS_ECC */
2422 case KEY_RSA_CERT:
2423 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2424 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2425 goto out;
2426 break;
2427 #endif /* WITH_OPENSSL */
2428 case KEY_ED25519_CERT:
2429 if ((ret = sshbuf_put_string(cert,
2430 k->ed25519_pk, ED25519_PK_SZ)) != 0)
2431 goto out;
2432 break;
2433 default:
2434 ret = SSH_ERR_INVALID_ARGUMENT;
2435 goto out;
2436 }
2437
2438 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2439 (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2440 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2441 goto out;
2442
2443 if ((principals = sshbuf_new()) == NULL) {
2444 ret = SSH_ERR_ALLOC_FAIL;
2445 goto out;
2446 }
2447 for (i = 0; i < k->cert->nprincipals; i++) {
2448 if ((ret = sshbuf_put_cstring(principals,
2449 k->cert->principals[i])) != 0)
2450 goto out;
2451 }
2452 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2453 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2454 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2455 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2456 (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2457 (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2458 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2459 goto out;
2460
2461 /* Sign the whole mess */
2462 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2463 sshbuf_len(cert), alg, 0)) != 0)
2464 goto out;
2465
2466 /* Append signature and we are done */
2467 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2468 goto out;
2469 ret = 0;
2470 out:
2471 if (ret != 0)
2472 sshbuf_reset(cert);
2473 free(sig_blob);
2474 free(ca_blob);
2475 sshbuf_free(principals);
2476 return ret;
2477 }
2478
2479 int
2480 sshkey_cert_check_authority(const struct sshkey *k,
2481 int want_host, int require_principal,
2482 const char *name, const char **reason)
2483 {
2484 u_int i, principal_matches;
2485 time_t now = time(NULL);
2486
2487 if (reason != NULL)
2488 *reason = NULL;
2489
2490 if (want_host) {
2491 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2492 *reason = "Certificate invalid: not a host certificate";
2493 return SSH_ERR_KEY_CERT_INVALID;
2494 }
2495 } else {
2496 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2497 *reason = "Certificate invalid: not a user certificate";
2498 return SSH_ERR_KEY_CERT_INVALID;
2499 }
2500 }
2501 if (now < 0) {
2502 /* yikes - system clock before epoch! */
2503 *reason = "Certificate invalid: not yet valid";
2504 return SSH_ERR_KEY_CERT_INVALID;
2505 }
2506 if ((u_int64_t)now < k->cert->valid_after) {
2507 *reason = "Certificate invalid: not yet valid";
2508 return SSH_ERR_KEY_CERT_INVALID;
2509 }
2510 if ((u_int64_t)now >= k->cert->valid_before) {
2511 *reason = "Certificate invalid: expired";
2512 return SSH_ERR_KEY_CERT_INVALID;
2513 }
2514 if (k->cert->nprincipals == 0) {
2515 if (require_principal) {
2516 *reason = "Certificate lacks principal list";
2517 return SSH_ERR_KEY_CERT_INVALID;
2518 }
2519 } else if (name != NULL) {
2520 principal_matches = 0;
2521 for (i = 0; i < k->cert->nprincipals; i++) {
2522 if (strcmp(name, k->cert->principals[i]) == 0) {
2523 principal_matches = 1;
2524 break;
2525 }
2526 }
2527 if (!principal_matches) {
2528 *reason = "Certificate invalid: name is not a listed "
2529 "principal";
2530 return SSH_ERR_KEY_CERT_INVALID;
2531 }
2532 }
2533 return 0;
2534 }
2535
2536 size_t
2537 sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2538 {
2539 char from[32], to[32], ret[64];
2540 time_t tt;
2541 struct tm *tm;
2542
2543 *from = *to = '\0';
2544 if (cert->valid_after == 0 &&
2545 cert->valid_before == 0xffffffffffffffffULL)
2546 return strlcpy(s, "forever", l);
2547
2548 if (cert->valid_after != 0) {
2549 /* XXX revisit INT_MAX in 2038 :) */
2550 tt = cert->valid_after > INT_MAX ?
2551 INT_MAX : cert->valid_after;
2552 tm = localtime(&tt);
2553 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2554 }
2555 if (cert->valid_before != 0xffffffffffffffffULL) {
2556 /* XXX revisit INT_MAX in 2038 :) */
2557 tt = cert->valid_before > INT_MAX ?
2558 INT_MAX : cert->valid_before;
2559 tm = localtime(&tt);
2560 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2561 }
2562
2563 if (cert->valid_after == 0)
2564 snprintf(ret, sizeof(ret), "before %s", to);
2565 else if (cert->valid_before == 0xffffffffffffffffULL)
2566 snprintf(ret, sizeof(ret), "after %s", from);
2567 else
2568 snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2569
2570 return strlcpy(s, ret, l);
2571 }
2572
2573 int
2574 sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2575 {
2576 int r = SSH_ERR_INTERNAL_ERROR;
2577
2578 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2579 goto out;
2580 switch (key->type) {
2581 #ifdef WITH_OPENSSL
2582 case KEY_RSA:
2583 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2584 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2585 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2586 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2587 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2588 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2589 goto out;
2590 break;
2591 case KEY_RSA_CERT:
2592 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2593 r = SSH_ERR_INVALID_ARGUMENT;
2594 goto out;
2595 }
2596 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2597 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2598 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2599 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2600 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2601 goto out;
2602 break;
2603 case KEY_DSA:
2604 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2605 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2606 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2607 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2608 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2609 goto out;
2610 break;
2611 case KEY_DSA_CERT:
2612 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2613 r = SSH_ERR_INVALID_ARGUMENT;
2614 goto out;
2615 }
2616 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2617 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2618 goto out;
2619 break;
2620 # ifdef OPENSSL_HAS_ECC
2621 case KEY_ECDSA:
2622 if ((r = sshbuf_put_cstring(b,
2623 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2624 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2625 (r = sshbuf_put_bignum2(b,
2626 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2627 goto out;
2628 break;
2629 case KEY_ECDSA_CERT:
2630 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2631 r = SSH_ERR_INVALID_ARGUMENT;
2632 goto out;
2633 }
2634 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2635 (r = sshbuf_put_bignum2(b,
2636 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2637 goto out;
2638 break;
2639 # endif /* OPENSSL_HAS_ECC */
2640 #endif /* WITH_OPENSSL */
2641 case KEY_ED25519:
2642 if ((r = sshbuf_put_string(b, key->ed25519_pk,
2643 ED25519_PK_SZ)) != 0 ||
2644 (r = sshbuf_put_string(b, key->ed25519_sk,
2645 ED25519_SK_SZ)) != 0)
2646 goto out;
2647 break;
2648 case KEY_ED25519_CERT:
2649 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2650 r = SSH_ERR_INVALID_ARGUMENT;
2651 goto out;
2652 }
2653 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2654 (r = sshbuf_put_string(b, key->ed25519_pk,
2655 ED25519_PK_SZ)) != 0 ||
2656 (r = sshbuf_put_string(b, key->ed25519_sk,
2657 ED25519_SK_SZ)) != 0)
2658 goto out;
2659 break;
2660 default:
2661 r = SSH_ERR_INVALID_ARGUMENT;
2662 goto out;
2663 }
2664 /* success */
2665 r = 0;
2666 out:
2667 return r;
2668 }
2669
2670 int
2671 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2672 {
2673 char *tname = NULL, *curve = NULL;
2674 struct sshkey *k = NULL;
2675 size_t pklen = 0, sklen = 0;
2676 int type, r = SSH_ERR_INTERNAL_ERROR;
2677 u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2678 #ifdef WITH_OPENSSL
2679 BIGNUM *exponent = NULL;
2680 #endif /* WITH_OPENSSL */
2681
2682 if (kp != NULL)
2683 *kp = NULL;
2684 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2685 goto out;
2686 type = sshkey_type_from_name(tname);
2687 switch (type) {
2688 #ifdef WITH_OPENSSL
2689 case KEY_DSA:
2690 if ((k = sshkey_new_private(type)) == NULL) {
2691 r = SSH_ERR_ALLOC_FAIL;
2692 goto out;
2693 }
2694 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2695 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2696 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2697 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2698 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2699 goto out;
2700 break;
2701 case KEY_DSA_CERT:
2702 if ((r = sshkey_froms(buf, &k)) != 0 ||
2703 (r = sshkey_add_private(k)) != 0 ||
2704 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2705 goto out;
2706 break;
2707 # ifdef OPENSSL_HAS_ECC
2708 case KEY_ECDSA:
2709 if ((k = sshkey_new_private(type)) == NULL) {
2710 r = SSH_ERR_ALLOC_FAIL;
2711 goto out;
2712 }
2713 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2714 r = SSH_ERR_INVALID_ARGUMENT;
2715 goto out;
2716 }
2717 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2718 goto out;
2719 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2720 r = SSH_ERR_EC_CURVE_MISMATCH;
2721 goto out;
2722 }
2723 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2724 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2725 r = SSH_ERR_LIBCRYPTO_ERROR;
2726 goto out;
2727 }
2728 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2729 (r = sshbuf_get_bignum2(buf, exponent)))
2730 goto out;
2731 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2732 r = SSH_ERR_LIBCRYPTO_ERROR;
2733 goto out;
2734 }
2735 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2736 EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
2737 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2738 goto out;
2739 break;
2740 case KEY_ECDSA_CERT:
2741 if ((exponent = BN_new()) == NULL) {
2742 r = SSH_ERR_LIBCRYPTO_ERROR;
2743 goto out;
2744 }
2745 if ((r = sshkey_froms(buf, &k)) != 0 ||
2746 (r = sshkey_add_private(k)) != 0 ||
2747 (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2748 goto out;
2749 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2750 r = SSH_ERR_LIBCRYPTO_ERROR;
2751 goto out;
2752 }
2753 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2754 EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
2755 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2756 goto out;
2757 break;
2758 # endif /* OPENSSL_HAS_ECC */
2759 case KEY_RSA:
2760 if ((k = sshkey_new_private(type)) == NULL) {
2761 r = SSH_ERR_ALLOC_FAIL;
2762 goto out;
2763 }
2764 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2765 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2766 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2767 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2768 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2769 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2770 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2771 goto out;
2772 break;
2773 case KEY_RSA_CERT:
2774 if ((r = sshkey_froms(buf, &k)) != 0 ||
2775 (r = sshkey_add_private(k)) != 0 ||
2776 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2777 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2778 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2779 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2780 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2781 goto out;
2782 break;
2783 #endif /* WITH_OPENSSL */
2784 case KEY_ED25519:
2785 if ((k = sshkey_new_private(type)) == NULL) {
2786 r = SSH_ERR_ALLOC_FAIL;
2787 goto out;
2788 }
2789 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2790 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2791 goto out;
2792 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2793 r = SSH_ERR_INVALID_FORMAT;
2794 goto out;
2795 }
2796 k->ed25519_pk = ed25519_pk;
2797 k->ed25519_sk = ed25519_sk;
2798 ed25519_pk = ed25519_sk = NULL;
2799 break;
2800 case KEY_ED25519_CERT:
2801 if ((r = sshkey_froms(buf, &k)) != 0 ||
2802 (r = sshkey_add_private(k)) != 0 ||
2803 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2804 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2805 goto out;
2806 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2807 r = SSH_ERR_INVALID_FORMAT;
2808 goto out;
2809 }
2810 k->ed25519_pk = ed25519_pk;
2811 k->ed25519_sk = ed25519_sk;
2812 ed25519_pk = ed25519_sk = NULL;
2813 break;
2814 default:
2815 r = SSH_ERR_KEY_TYPE_UNKNOWN;
2816 goto out;
2817 }
2818 #ifdef WITH_OPENSSL
2819 /* enable blinding */
2820 switch (k->type) {
2821 case KEY_RSA:
2822 case KEY_RSA_CERT:
2823 case KEY_RSA1:
2824 if (RSA_blinding_on(k->rsa, NULL) != 1) {
2825 r = SSH_ERR_LIBCRYPTO_ERROR;
2826 goto out;
2827 }
2828 break;
2829 }
2830 #endif /* WITH_OPENSSL */
2831 /* success */
2832 r = 0;
2833 if (kp != NULL) {
2834 *kp = k;
2835 k = NULL;
2836 }
2837 out:
2838 free(tname);
2839 free(curve);
2840 #ifdef WITH_OPENSSL
2841 if (exponent != NULL)
2842 BN_clear_free(exponent);
2843 #endif /* WITH_OPENSSL */
2844 sshkey_free(k);
2845 if (ed25519_pk != NULL) {
2846 explicit_bzero(ed25519_pk, pklen);
2847 free(ed25519_pk);
2848 }
2849 if (ed25519_sk != NULL) {
2850 explicit_bzero(ed25519_sk, sklen);
2851 free(ed25519_sk);
2852 }
2853 return r;
2854 }
2855
2856 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2857 int
2858 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2859 {
2860 BN_CTX *bnctx;
2861 EC_POINT *nq = NULL;
2862 BIGNUM *order, *x, *y, *tmp;
2863 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2864
2865 if ((bnctx = BN_CTX_new()) == NULL)
2866 return SSH_ERR_ALLOC_FAIL;
2867 BN_CTX_start(bnctx);
2868
2869 /*
2870 * We shouldn't ever hit this case because bignum_get_ecpoint()
2871 * refuses to load GF2m points.
2872 */
2873 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2874 NID_X9_62_prime_field)
2875 goto out;
2876
2877 /* Q != infinity */
2878 if (EC_POINT_is_at_infinity(group, public))
2879 goto out;
2880
2881 if ((x = BN_CTX_get(bnctx)) == NULL ||
2882 (y = BN_CTX_get(bnctx)) == NULL ||
2883 (order = BN_CTX_get(bnctx)) == NULL ||
2884 (tmp = BN_CTX_get(bnctx)) == NULL) {
2885 ret = SSH_ERR_ALLOC_FAIL;
2886 goto out;
2887 }
2888
2889 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2890 if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2891 EC_POINT_get_affine_coordinates_GFp(group, public,
2892 x, y, bnctx) != 1) {
2893 ret = SSH_ERR_LIBCRYPTO_ERROR;
2894 goto out;
2895 }
2896 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2897 BN_num_bits(y) <= BN_num_bits(order) / 2)
2898 goto out;
2899
2900 /* nQ == infinity (n == order of subgroup) */
2901 if ((nq = EC_POINT_new(group)) == NULL) {
2902 ret = SSH_ERR_ALLOC_FAIL;
2903 goto out;
2904 }
2905 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2906 ret = SSH_ERR_LIBCRYPTO_ERROR;
2907 goto out;
2908 }
2909 if (EC_POINT_is_at_infinity(group, nq) != 1)
2910 goto out;
2911
2912 /* x < order - 1, y < order - 1 */
2913 if (!BN_sub(tmp, order, BN_value_one())) {
2914 ret = SSH_ERR_LIBCRYPTO_ERROR;
2915 goto out;
2916 }
2917 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2918 goto out;
2919 ret = 0;
2920 out:
2921 BN_CTX_free(bnctx);
2922 if (nq != NULL)
2923 EC_POINT_free(nq);
2924 return ret;
2925 }
2926
2927 int
2928 sshkey_ec_validate_private(const EC_KEY *key)
2929 {
2930 BN_CTX *bnctx;
2931 BIGNUM *order, *tmp;
2932 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2933
2934 if ((bnctx = BN_CTX_new()) == NULL)
2935 return SSH_ERR_ALLOC_FAIL;
2936 BN_CTX_start(bnctx);
2937
2938 if ((order = BN_CTX_get(bnctx)) == NULL ||
2939 (tmp = BN_CTX_get(bnctx)) == NULL) {
2940 ret = SSH_ERR_ALLOC_FAIL;
2941 goto out;
2942 }
2943
2944 /* log2(private) > log2(order)/2 */
2945 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2946 ret = SSH_ERR_LIBCRYPTO_ERROR;
2947 goto out;
2948 }
2949 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2950 BN_num_bits(order) / 2)
2951 goto out;
2952
2953 /* private < order - 1 */
2954 if (!BN_sub(tmp, order, BN_value_one())) {
2955 ret = SSH_ERR_LIBCRYPTO_ERROR;
2956 goto out;
2957 }
2958 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2959 goto out;
2960 ret = 0;
2961 out:
2962 BN_CTX_free(bnctx);
2963 return ret;
2964 }
2965
2966 void
2967 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2968 {
2969 BIGNUM *x, *y;
2970 BN_CTX *bnctx;
2971
2972 if (point == NULL) {
2973 fputs("point=(NULL)\n", stderr);
2974 return;
2975 }
2976 if ((bnctx = BN_CTX_new()) == NULL) {
2977 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2978 return;
2979 }
2980 BN_CTX_start(bnctx);
2981 if ((x = BN_CTX_get(bnctx)) == NULL ||
2982 (y = BN_CTX_get(bnctx)) == NULL) {
2983 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2984 return;
2985 }
2986 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2987 NID_X9_62_prime_field) {
2988 fprintf(stderr, "%s: group is not a prime field\n", __func__);
2989 return;
2990 }
2991 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2992 bnctx) != 1) {
2993 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2994 __func__);
2995 return;
2996 }
2997 fputs("x=", stderr);
2998 BN_print_fp(stderr, x);
2999 fputs("\ny=", stderr);
3000 BN_print_fp(stderr, y);
3001 fputs("\n", stderr);
3002 BN_CTX_free(bnctx);
3003 }
3004
3005 void
3006 sshkey_dump_ec_key(const EC_KEY *key)
3007 {
3008 const BIGNUM *exponent;
3009
3010 sshkey_dump_ec_point(EC_KEY_get0_group(key),
3011 EC_KEY_get0_public_key(key));
3012 fputs("exponent=", stderr);
3013 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3014 fputs("(NULL)", stderr);
3015 else
3016 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3017 fputs("\n", stderr);
3018 }
3019 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
3020
3021 static int
3022 sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
3023 const char *passphrase, const char *comment, const char *ciphername,
3024 int rounds)
3025 {
3026 u_char *cp, *key = NULL, *pubkeyblob = NULL;
3027 u_char salt[SALT_LEN];
3028 char *b64 = NULL;
3029 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3030 u_int check;
3031 int r = SSH_ERR_INTERNAL_ERROR;
3032 struct sshcipher_ctx ciphercontext;
3033 const struct sshcipher *cipher;
3034 const char *kdfname = KDFNAME;
3035 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3036
3037 memset(&ciphercontext, 0, sizeof(ciphercontext));
3038
3039 if (rounds <= 0)
3040 rounds = DEFAULT_ROUNDS;
3041 if (passphrase == NULL || !strlen(passphrase)) {
3042 ciphername = "none";
3043 kdfname = "none";
3044 } else if (ciphername == NULL)
3045 ciphername = DEFAULT_CIPHERNAME;
3046 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
3047 r = SSH_ERR_INVALID_ARGUMENT;
3048 goto out;
3049 }
3050 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3051 r = SSH_ERR_INTERNAL_ERROR;
3052 goto out;
3053 }
3054
3055 if ((kdf = sshbuf_new()) == NULL ||
3056 (encoded = sshbuf_new()) == NULL ||
3057 (encrypted = sshbuf_new()) == NULL) {
3058 r = SSH_ERR_ALLOC_FAIL;
3059 goto out;
3060 }
3061 blocksize = cipher_blocksize(cipher);
3062 keylen = cipher_keylen(cipher);
3063 ivlen = cipher_ivlen(cipher);
3064 authlen = cipher_authlen(cipher);
3065 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3066 r = SSH_ERR_ALLOC_FAIL;
3067 goto out;
3068 }
3069 if (strcmp(kdfname, "bcrypt") == 0) {
3070 arc4random_buf(salt, SALT_LEN);
3071 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3072 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3073 r = SSH_ERR_INVALID_ARGUMENT;
3074 goto out;
3075 }
3076 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3077 (r = sshbuf_put_u32(kdf, rounds)) != 0)
3078 goto out;
3079 } else if (strcmp(kdfname, "none") != 0) {
3080 /* Unsupported KDF type */
3081 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3082 goto out;
3083 }
3084 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3085 key + keylen, ivlen, 1)) != 0)
3086 goto out;
3087
3088 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3089 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3090 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3091 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3092 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3093 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3094 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3095 goto out;
3096
3097 /* set up the buffer that will be encrypted */
3098
3099 /* Random check bytes */
3100 check = arc4random();
3101 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3102 (r = sshbuf_put_u32(encrypted, check)) != 0)
3103 goto out;
3104
3105 /* append private key and comment*/
3106 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3107 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3108 goto out;
3109
3110 /* padding */
3111 i = 0;
3112 while (sshbuf_len(encrypted) % blocksize) {
3113 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3114 goto out;
3115 }
3116
3117 /* length in destination buffer */
3118 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3119 goto out;
3120
3121 /* encrypt */
3122 if ((r = sshbuf_reserve(encoded,
3123 sshbuf_len(encrypted) + authlen, &cp)) != 0)
3124 goto out;
3125 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3126 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3127 goto out;
3128
3129 /* uuencode */
3130 if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3131 r = SSH_ERR_ALLOC_FAIL;
3132 goto out;
3133 }
3134
3135 sshbuf_reset(blob);
3136 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3137 goto out;
3138 for (i = 0; i < strlen(b64); i++) {
3139 if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3140 goto out;
3141 /* insert line breaks */
3142 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3143 goto out;
3144 }
3145 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3146 goto out;
3147 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3148 goto out;
3149
3150 /* success */
3151 r = 0;
3152
3153 out:
3154 sshbuf_free(kdf);
3155 sshbuf_free(encoded);
3156 sshbuf_free(encrypted);
3157 cipher_cleanup(&ciphercontext);
3158 explicit_bzero(salt, sizeof(salt));
3159 if (key != NULL) {
3160 explicit_bzero(key, keylen + ivlen);
3161 free(key);
3162 }
3163 if (pubkeyblob != NULL) {
3164 explicit_bzero(pubkeyblob, pubkeylen);
3165 free(pubkeyblob);
3166 }
3167 if (b64 != NULL) {
3168 explicit_bzero(b64, strlen(b64));
3169 free(b64);
3170 }
3171 return r;
3172 }
3173
3174 static int
3175 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3176 struct sshkey **keyp, char **commentp)
3177 {
3178 char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3179 const struct sshcipher *cipher = NULL;
3180 const u_char *cp;
3181 int r = SSH_ERR_INTERNAL_ERROR;
3182 size_t encoded_len;
3183 size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3184 struct sshbuf *encoded = NULL, *decoded = NULL;
3185 struct sshbuf *kdf = NULL, *decrypted = NULL;
3186 struct sshcipher_ctx ciphercontext;
3187 struct sshkey *k = NULL;
3188 u_char *key = NULL, *salt = NULL, *dp, pad, last;
3189 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3190
3191 memset(&ciphercontext, 0, sizeof(ciphercontext));
3192 if (keyp != NULL)
3193 *keyp = NULL;
3194 if (commentp != NULL)
3195 *commentp = NULL;
3196
3197 if ((encoded = sshbuf_new()) == NULL ||
3198 (decoded = sshbuf_new()) == NULL ||
3199 (decrypted = sshbuf_new()) == NULL) {
3200 r = SSH_ERR_ALLOC_FAIL;
3201 goto out;
3202 }
3203
3204 /* check preamble */
3205 cp = sshbuf_ptr(blob);
3206 encoded_len = sshbuf_len(blob);
3207 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3208 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3209 r = SSH_ERR_INVALID_FORMAT;
3210 goto out;
3211 }
3212 cp += MARK_BEGIN_LEN;
3213 encoded_len -= MARK_BEGIN_LEN;
3214
3215 /* Look for end marker, removing whitespace as we go */
3216 while (encoded_len > 0) {
3217 if (*cp != '\n' && *cp != '\r') {
3218 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3219 goto out;
3220 }
3221 last = *cp;
3222 encoded_len--;
3223 cp++;
3224 if (last == '\n') {
3225 if (encoded_len >= MARK_END_LEN &&
3226 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3227 /* \0 terminate */
3228 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3229 goto out;
3230 break;
3231 }
3232 }
3233 }
3234 if (encoded_len == 0) {
3235 r = SSH_ERR_INVALID_FORMAT;
3236 goto out;
3237 }
3238
3239 /* decode base64 */
3240 if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
3241 goto out;
3242
3243 /* check magic */
3244 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3245 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3246 r = SSH_ERR_INVALID_FORMAT;
3247 goto out;
3248 }
3249 /* parse public portion of key */
3250 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3251 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3252 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3253 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3254 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3255 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3256 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3257 goto out;
3258
3259 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3260 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3261 goto out;
3262 }
3263 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3264 strcmp(ciphername, "none") != 0) {
3265 /* passphrase required */
3266 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3267 goto out;
3268 }
3269 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3270 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3271 goto out;
3272 }
3273 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3274 r = SSH_ERR_INVALID_FORMAT;
3275 goto out;
3276 }
3277 if (nkeys != 1) {
3278 /* XXX only one key supported */
3279 r = SSH_ERR_INVALID_FORMAT;
3280 goto out;
3281 }
3282
3283 /* check size of encrypted key blob */
3284 blocksize = cipher_blocksize(cipher);
3285 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3286 r = SSH_ERR_INVALID_FORMAT;
3287 goto out;
3288 }
3289
3290 /* setup key */
3291 keylen = cipher_keylen(cipher);
3292 ivlen = cipher_ivlen(cipher);
3293 authlen = cipher_authlen(cipher);
3294 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3295 r = SSH_ERR_ALLOC_FAIL;
3296 goto out;
3297 }
3298 if (strcmp(kdfname, "bcrypt") == 0) {
3299 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3300 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3301 goto out;
3302 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3303 key, keylen + ivlen, rounds) < 0) {
3304 r = SSH_ERR_INVALID_FORMAT;
3305 goto out;
3306 }
3307 }
3308
3309 /* check that an appropriate amount of auth data is present */
3310 if (sshbuf_len(decoded) < encrypted_len + authlen) {
3311 r = SSH_ERR_INVALID_FORMAT;
3312 goto out;
3313 }
3314
3315 /* decrypt private portion of key */
3316 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3317 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3318 key + keylen, ivlen, 0)) != 0)
3319 goto out;
3320 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3321 encrypted_len, 0, authlen)) != 0) {
3322 /* an integrity error here indicates an incorrect passphrase */
3323 if (r == SSH_ERR_MAC_INVALID)
3324 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3325 goto out;
3326 }
3327 if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
3328 goto out;
3329 /* there should be no trailing data */
3330 if (sshbuf_len(decoded) != 0) {
3331 r = SSH_ERR_INVALID_FORMAT;
3332 goto out;
3333 }
3334
3335 /* check check bytes */
3336 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3337 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3338 goto out;
3339 if (check1 != check2) {
3340 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3341 goto out;
3342 }
3343
3344 /* Load the private key and comment */
3345 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3346 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3347 goto out;
3348
3349 /* Check deterministic padding */
3350 i = 0;
3351 while (sshbuf_len(decrypted)) {
3352 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3353 goto out;
3354 if (pad != (++i & 0xff)) {
3355 r = SSH_ERR_INVALID_FORMAT;
3356 goto out;
3357 }
3358 }
3359
3360 /* XXX decode pubkey and check against private */
3361
3362 /* success */
3363 r = 0;
3364 if (keyp != NULL) {
3365 *keyp = k;
3366 k = NULL;
3367 }
3368 if (commentp != NULL) {
3369 *commentp = comment;
3370 comment = NULL;
3371 }
3372 out:
3373 pad = 0;
3374 cipher_cleanup(&ciphercontext);
3375 free(ciphername);
3376 free(kdfname);
3377 free(comment);
3378 if (salt != NULL) {
3379 explicit_bzero(salt, slen);
3380 free(salt);
3381 }
3382 if (key != NULL) {
3383 explicit_bzero(key, keylen + ivlen);
3384 free(key);
3385 }
3386 sshbuf_free(encoded);
3387 sshbuf_free(decoded);
3388 sshbuf_free(kdf);
3389 sshbuf_free(decrypted);
3390 sshkey_free(k);
3391 return r;
3392 }
3393
3394 #if WITH_SSH1
3395 /*
3396 * Serialises the authentication (private) key to a blob, encrypting it with
3397 * passphrase. The identification of the blob (lowest 64 bits of n) will
3398 * precede the key to provide identification of the key without needing a
3399 * passphrase.
3400 */
3401 static int
3402 sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3403 const char *passphrase, const char *comment)
3404 {
3405 struct sshbuf *buffer = NULL, *encrypted = NULL;
3406 u_char buf[8];
3407 int r, cipher_num;
3408 struct sshcipher_ctx ciphercontext;
3409 const struct sshcipher *cipher;
3410 u_char *cp;
3411
3412 /*
3413 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3414 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3415 */
3416 cipher_num = (strcmp(passphrase, "") == 0) ?
3417 SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3418 if ((cipher = cipher_by_number(cipher_num)) == NULL)
3419 return SSH_ERR_INTERNAL_ERROR;
3420
3421 /* This buffer is used to build the secret part of the private key. */
3422 if ((buffer = sshbuf_new()) == NULL)
3423 return SSH_ERR_ALLOC_FAIL;
3424
3425 /* Put checkbytes for checking passphrase validity. */
3426 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3427 goto out;
3428 arc4random_buf(cp, 2);
3429 memcpy(cp + 2, cp, 2);
3430
3431 /*
3432 * Store the private key (n and e will not be stored because they
3433 * will be stored in plain text, and storing them also in encrypted
3434 * format would just give known plaintext).
3435 * Note: q and p are stored in reverse order to SSL.
3436 */
3437 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3438 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3439 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3440 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3441 goto out;
3442
3443 /* Pad the part to be encrypted to a size that is a multiple of 8. */
3444 explicit_bzero(buf, 8);
3445 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3446 goto out;
3447
3448 /* This buffer will be used to contain the data in the file. */
3449 if ((encrypted = sshbuf_new()) == NULL) {
3450 r = SSH_ERR_ALLOC_FAIL;
3451 goto out;
3452 }
3453
3454 /* First store keyfile id string. */
3455 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3456 sizeof(LEGACY_BEGIN))) != 0)
3457 goto out;
3458
3459 /* Store cipher type and "reserved" field. */
3460 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3461 (r = sshbuf_put_u32(encrypted, 0)) != 0)
3462 goto out;
3463
3464 /* Store public key. This will be in plain text. */
3465 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3466 (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 ||
3467 (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 ||
3468 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3469 goto out;
3470
3471 /* Allocate space for the private part of the key in the buffer. */
3472 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3473 goto out;
3474
3475 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3476 CIPHER_ENCRYPT)) != 0)
3477 goto out;
3478 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3479 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3480 goto out;
3481 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3482 goto out;
3483
3484 r = sshbuf_putb(blob, encrypted);
3485
3486 out:
3487 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3488 explicit_bzero(buf, sizeof(buf));
3489 sshbuf_free(buffer);
3490 sshbuf_free(encrypted);
3491
3492 return r;
3493 }
3494 #endif /* WITH_SSH1 */
3495
3496 #ifdef WITH_OPENSSL
3497 /* convert SSH v2 key in OpenSSL PEM format */
3498 static int
3499 sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3500 const char *_passphrase, const char *comment)
3501 {
3502 int success, r;
3503 int blen, len = strlen(_passphrase);
3504 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3505 #if (OPENSSL_VERSION_NUMBER < 0x00907000L)
3506 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
3507 #else
3508 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3509 #endif
3510 const u_char *bptr;
3511 BIO *bio = NULL;
3512
3513 if (len > 0 && len <= 4)
3514 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3515 if ((bio = BIO_new(BIO_s_mem())) == NULL)
3516 return SSH_ERR_ALLOC_FAIL;
3517
3518 switch (key->type) {
3519 case KEY_DSA:
3520 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3521 cipher, passphrase, len, NULL, NULL);
3522 break;
3523 #ifdef OPENSSL_HAS_ECC
3524 case KEY_ECDSA:
3525 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3526 cipher, passphrase, len, NULL, NULL);
3527 break;
3528 #endif
3529 case KEY_RSA:
3530 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3531 cipher, passphrase, len, NULL, NULL);
3532 break;
3533 default:
3534 success = 0;
3535 break;
3536 }
3537 if (success == 0) {
3538 r = SSH_ERR_LIBCRYPTO_ERROR;
3539 goto out;
3540 }
3541 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3542 r = SSH_ERR_INTERNAL_ERROR;
3543 goto out;
3544 }
3545 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3546 goto out;
3547 r = 0;
3548 out:
3549 BIO_free(bio);
3550 return r;
3551 }
3552 #endif /* WITH_OPENSSL */
3553
3554 /* Serialise "key" to buffer "blob" */
3555 int
3556 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3557 const char *passphrase, const char *comment,
3558 int force_new_format, const char *new_format_cipher, int new_format_rounds)
3559 {
3560 switch (key->type) {
3561 #ifdef WITH_SSH1
3562 case KEY_RSA1:
3563 return sshkey_private_rsa1_to_blob(key, blob,
3564 passphrase, comment);
3565 #endif /* WITH_SSH1 */
3566 #ifdef WITH_OPENSSL
3567 case KEY_DSA:
3568 case KEY_ECDSA:
3569 case KEY_RSA:
3570 if (force_new_format) {
3571 return sshkey_private_to_blob2(key, blob, passphrase,
3572 comment, new_format_cipher, new_format_rounds);
3573 }
3574 return sshkey_private_pem_to_blob(key, blob,
3575 passphrase, comment);
3576 #endif /* WITH_OPENSSL */
3577 case KEY_ED25519:
3578 return sshkey_private_to_blob2(key, blob, passphrase,
3579 comment, new_format_cipher, new_format_rounds);
3580 default:
3581 return SSH_ERR_KEY_TYPE_UNKNOWN;
3582 }
3583 }
3584
3585 #ifdef WITH_SSH1
3586 /*
3587 * Parse the public, unencrypted portion of a RSA1 key.
3588 */
3589 int
3590 sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3591 struct sshkey **keyp, char **commentp)
3592 {
3593 int r;
3594 struct sshkey *pub = NULL;
3595 struct sshbuf *copy = NULL;
3596
3597 if (keyp != NULL)
3598 *keyp = NULL;
3599 if (commentp != NULL)
3600 *commentp = NULL;
3601
3602 /* Check that it is at least big enough to contain the ID string. */
3603 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3604 return SSH_ERR_INVALID_FORMAT;
3605
3606 /*
3607 * Make sure it begins with the id string. Consume the id string
3608 * from the buffer.
3609 */
3610 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3611 return SSH_ERR_INVALID_FORMAT;
3612 /* Make a working copy of the keyblob and skip past the magic */
3613 if ((copy = sshbuf_fromb(blob)) == NULL)
3614 return SSH_ERR_ALLOC_FAIL;
3615 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3616 goto out;
3617
3618 /* Skip cipher type, reserved data and key bits. */
3619 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3620 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3621 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3622 goto out;
3623
3624 /* Read the public key from the buffer. */
3625 if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3626 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3627 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3628 goto out;
3629
3630 /* Finally, the comment */
3631 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3632 goto out;
3633
3634 /* The encrypted private part is not parsed by this function. */
3635
3636 r = 0;
3637 if (keyp != NULL) {
3638 *keyp = pub;
3639 pub = NULL;
3640 }
3641 out:
3642 sshbuf_free(copy);
3643 sshkey_free(pub);
3644 return r;
3645 }
3646
3647 static int
3648 sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3649 struct sshkey **keyp, char **commentp)
3650 {
3651 int r;
3652 u_int16_t check1, check2;
3653 u_int8_t cipher_type;
3654 struct sshbuf *decrypted = NULL, *copy = NULL;
3655 u_char *cp;
3656 char *comment = NULL;
3657 struct sshcipher_ctx ciphercontext;
3658 const struct sshcipher *cipher;
3659 struct sshkey *prv = NULL;
3660
3661 if (keyp != NULL)
3662 *keyp = NULL;
3663 if (commentp != NULL)
3664 *commentp = NULL;
3665
3666 /* Check that it is at least big enough to contain the ID string. */
3667 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3668 return SSH_ERR_INVALID_FORMAT;
3669
3670 /*
3671 * Make sure it begins with the id string. Consume the id string
3672 * from the buffer.
3673 */
3674 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3675 return SSH_ERR_INVALID_FORMAT;
3676
3677 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3678 r = SSH_ERR_ALLOC_FAIL;
3679 goto out;
3680 }
3681 if ((copy = sshbuf_fromb(blob)) == NULL ||
3682 (decrypted = sshbuf_new()) == NULL) {
3683 r = SSH_ERR_ALLOC_FAIL;
3684 goto out;
3685 }
3686 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3687 goto out;
3688
3689 /* Read cipher type. */
3690 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3691 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3692 goto out;
3693
3694 /* Read the public key and comment from the buffer. */
3695 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3696 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3697 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3698 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3699 goto out;
3700
3701 /* Check that it is a supported cipher. */
3702 cipher = cipher_by_number(cipher_type);
3703 if (cipher == NULL) {
3704 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3705 goto out;
3706 }
3707 /* Initialize space for decrypted data. */
3708 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3709 goto out;
3710
3711 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3712 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3713 CIPHER_DECRYPT)) != 0)
3714 goto out;
3715 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3716 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3717 cipher_cleanup(&ciphercontext);
3718 goto out;
3719 }
3720 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3721 goto out;
3722
3723 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3724 (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3725 goto out;
3726 if (check1 != check2) {
3727 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3728 goto out;
3729 }
3730
3731 /* Read the rest of the private key. */
3732 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3733 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3734 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3735 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3736 goto out;
3737
3738 /* calculate p-1 and q-1 */
3739 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3740 goto out;
3741
3742 /* enable blinding */
3743 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3744 r = SSH_ERR_LIBCRYPTO_ERROR;
3745 goto out;
3746 }
3747 r = 0;
3748 if (keyp != NULL) {
3749 *keyp = prv;
3750 prv = NULL;
3751 }
3752 if (commentp != NULL) {
3753 *commentp = comment;
3754 comment = NULL;
3755 }
3756 out:
3757 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3758 free(comment);
3759 sshkey_free(prv);
3760 sshbuf_free(copy);
3761 sshbuf_free(decrypted);
3762 return r;
3763 }
3764 #endif /* WITH_SSH1 */
3765
3766 #ifdef WITH_OPENSSL
3767 static int
3768 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3769 const char *passphrase, struct sshkey **keyp)
3770 {
3771 EVP_PKEY *pk = NULL;
3772 struct sshkey *prv = NULL;
3773 BIO *bio = NULL;
3774 int r;
3775
3776 if (keyp != NULL)
3777 *keyp = NULL;
3778
3779 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3780 return SSH_ERR_ALLOC_FAIL;
3781 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3782 (int)sshbuf_len(blob)) {
3783 r = SSH_ERR_ALLOC_FAIL;
3784 goto out;
3785 }
3786
3787 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3788 (char *)passphrase)) == NULL) {
3789 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3790 goto out;
3791 }
3792 if (pk->type == EVP_PKEY_RSA &&
3793 (type == KEY_UNSPEC || type == KEY_RSA)) {
3794 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3795 r = SSH_ERR_ALLOC_FAIL;
3796 goto out;
3797 }
3798 prv->rsa = EVP_PKEY_get1_RSA(pk);
3799 prv->type = KEY_RSA;
3800 #ifdef DEBUG_PK
3801 RSA_print_fp(stderr, prv->rsa, 8);
3802 #endif
3803 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3804 r = SSH_ERR_LIBCRYPTO_ERROR;
3805 goto out;
3806 }
3807 } else if (pk->type == EVP_PKEY_DSA &&
3808 (type == KEY_UNSPEC || type == KEY_DSA)) {
3809 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3810 r = SSH_ERR_ALLOC_FAIL;
3811 goto out;
3812 }
3813 prv->dsa = EVP_PKEY_get1_DSA(pk);
3814 prv->type = KEY_DSA;
3815 #ifdef DEBUG_PK
3816 DSA_print_fp(stderr, prv->dsa, 8);
3817 #endif
3818 #ifdef OPENSSL_HAS_ECC
3819 } else if (pk->type == EVP_PKEY_EC &&
3820 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3821 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3822 r = SSH_ERR_ALLOC_FAIL;
3823 goto out;
3824 }
3825 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3826 prv->type = KEY_ECDSA;
3827 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3828 if (prv->ecdsa_nid == -1 ||
3829 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3830 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3831 EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3832 sshkey_ec_validate_private(prv->ecdsa) != 0) {
3833 r = SSH_ERR_INVALID_FORMAT;
3834 goto out;
3835 }
3836 # ifdef DEBUG_PK
3837 if (prv != NULL && prv->ecdsa != NULL)
3838 sshkey_dump_ec_key(prv->ecdsa);
3839 # endif
3840 #endif /* OPENSSL_HAS_ECC */
3841 } else {
3842 r = SSH_ERR_INVALID_FORMAT;
3843 goto out;
3844 }
3845 r = 0;
3846 if (keyp != NULL) {
3847 *keyp = prv;
3848 prv = NULL;
3849 }
3850 out:
3851 BIO_free(bio);
3852 if (pk != NULL)
3853 EVP_PKEY_free(pk);
3854 sshkey_free(prv);
3855 return r;
3856 }
3857 #endif /* WITH_OPENSSL */
3858
3859 int
3860 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3861 const char *passphrase, struct sshkey **keyp, char **commentp)
3862 {
3863 if (keyp != NULL)
3864 *keyp = NULL;
3865 if (commentp != NULL)
3866 *commentp = NULL;
3867
3868 switch (type) {
3869 #ifdef WITH_SSH1
3870 case KEY_RSA1:
3871 return sshkey_parse_private_rsa1(blob, passphrase,
3872 keyp, commentp);
3873 #endif /* WITH_SSH1 */
3874 #ifdef WITH_OPENSSL
3875 case KEY_DSA:
3876 case KEY_ECDSA:
3877 case KEY_RSA:
3878 return sshkey_parse_private_pem_fileblob(blob, type,
3879 passphrase, keyp);
3880 #endif /* WITH_OPENSSL */
3881 case KEY_ED25519:
3882 return sshkey_parse_private2(blob, type, passphrase,
3883 keyp, commentp);
3884 case KEY_UNSPEC:
3885 if (sshkey_parse_private2(blob, type, passphrase, keyp,
3886 commentp) == 0)
3887 return 0;
3888 #ifdef WITH_OPENSSL
3889 return sshkey_parse_private_pem_fileblob(blob, type,
3890 passphrase, keyp);
3891 #else
3892 return SSH_ERR_INVALID_FORMAT;
3893 #endif /* WITH_OPENSSL */
3894 default:
3895 return SSH_ERR_KEY_TYPE_UNKNOWN;
3896 }
3897 }
3898
3899 int
3900 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3901 struct sshkey **keyp, char **commentp)
3902 {
3903 if (keyp != NULL)
3904 *keyp = NULL;
3905 if (commentp != NULL)
3906 *commentp = NULL;
3907
3908 #ifdef WITH_SSH1
3909 /* it's a SSH v1 key if the public key part is readable */
3910 if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) {
3911 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3912 passphrase, keyp, commentp);
3913 }
3914 #endif /* WITH_SSH1 */
3915 return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3916 passphrase, keyp, commentp);
3917 }
DragonFly BSD