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kernel - Bring in dff23c692 from FreeBSD
[dragonfly.git] / crypto / openssh / sshkey.c
blobfdd0c8a89ae2df4f2ca8284951960e98a9186371
1 /* $OpenBSD: sshkey.c,v 1.3 2014/07/03 01:45:38 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>
31 #include <sys/types.h>
32
33 #include <openssl/evp.h>
34 #include <openssl/err.h>
35 #include <openssl/pem.h>
36
37 #include "crypto_api.h"
38
39 #include <errno.h>
40 #include <stdio.h>
41 #include <string.h>
42 #ifdef HAVE_UTIL_H
43 #include <util.h>
44 #endif /* HAVE_UTIL_H */
45
46 #include "ssh2.h"
47 #include "ssherr.h"
48 #include "misc.h"
49 #include "sshbuf.h"
50 #include "rsa.h"
51 #include "cipher.h"
52 #include "digest.h"
53 #define SSHKEY_INTERNAL
54 #include "sshkey.h"
55
56 /* openssh private key file format */
57 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
58 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
59 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
60 #define MARK_END_LEN (sizeof(MARK_END) - 1)
61 #define KDFNAME "bcrypt"
62 #define AUTH_MAGIC "openssh-key-v1"
63 #define SALT_LEN 16
64 #define DEFAULT_CIPHERNAME "aes256-cbc"
65 #define DEFAULT_ROUNDS 16
66
67 /* Version identification string for SSH v1 identity files. */
68 #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
69
70 static int sshkey_from_blob_internal(const u_char *blob, size_t blen,
71 struct sshkey **keyp, int allow_cert);
72
73 /* Supported key types */
74 struct keytype {
75 const char *name;
76 const char *shortname;
77 int type;
78 int nid;
79 int cert;
80 };
81 static const struct keytype keytypes[] = {
82 { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
83 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
84 KEY_ED25519_CERT, 0, 1 },
85 #ifdef WITH_OPENSSL
86 { NULL, "RSA1", KEY_RSA1, 0, 0 },
87 { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
88 { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
89 # ifdef OPENSSL_HAS_ECC
90 { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
91 { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
92 # ifdef OPENSSL_HAS_NISTP521
93 { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
94 # endif /* OPENSSL_HAS_NISTP521 */
95 # endif /* OPENSSL_HAS_ECC */
96 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
97 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
98 # ifdef OPENSSL_HAS_ECC
99 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
100 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
101 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
102 KEY_ECDSA_CERT, NID_secp384r1, 1 },
103 # ifdef OPENSSL_HAS_NISTP521
104 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
105 KEY_ECDSA_CERT, NID_secp521r1, 1 },
106 # endif /* OPENSSL_HAS_NISTP521 */
107 # endif /* OPENSSL_HAS_ECC */
108 { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
109 KEY_RSA_CERT_V00, 0, 1 },
110 { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
111 KEY_DSA_CERT_V00, 0, 1 },
112 #endif /* WITH_OPENSSL */
113 { NULL, NULL, -1, -1, 0 }
114 };
115
116 const char *
117 sshkey_type(const struct sshkey *k)
118 {
119 const struct keytype *kt;
120
121 for (kt = keytypes; kt->type != -1; kt++) {
122 if (kt->type == k->type)
123 return kt->shortname;
124 }
125 return "unknown";
126 }
127
128 static const char *
129 sshkey_ssh_name_from_type_nid(int type, int nid)
130 {
131 const struct keytype *kt;
132
133 for (kt = keytypes; kt->type != -1; kt++) {
134 if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
135 return kt->name;
136 }
137 return "ssh-unknown";
138 }
139
140 int
141 sshkey_type_is_cert(int type)
142 {
143 const struct keytype *kt;
144
145 for (kt = keytypes; kt->type != -1; kt++) {
146 if (kt->type == type)
147 return kt->cert;
148 }
149 return 0;
150 }
151
152 const char *
153 sshkey_ssh_name(const struct sshkey *k)
154 {
155 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
156 }
157
158 const char *
159 sshkey_ssh_name_plain(const struct sshkey *k)
160 {
161 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
162 k->ecdsa_nid);
163 }
164
165 int
166 sshkey_type_from_name(const char *name)
167 {
168 const struct keytype *kt;
169
170 for (kt = keytypes; kt->type != -1; kt++) {
171 /* Only allow shortname matches for plain key types */
172 if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
173 (!kt->cert && strcasecmp(kt->shortname, name) == 0))
174 return kt->type;
175 }
176 return KEY_UNSPEC;
177 }
178
179 int
180 sshkey_ecdsa_nid_from_name(const char *name)
181 {
182 const struct keytype *kt;
183
184 for (kt = keytypes; kt->type != -1; kt++) {
185 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
186 continue;
187 if (kt->name != NULL && strcmp(name, kt->name) == 0)
188 return kt->nid;
189 }
190 return -1;
191 }
192
193 char *
194 key_alg_list(int certs_only, int plain_only)
195 {
196 char *tmp, *ret = NULL;
197 size_t nlen, rlen = 0;
198 const struct keytype *kt;
199
200 for (kt = keytypes; kt->type != -1; kt++) {
201 if (kt->name == NULL)
202 continue;
203 if ((certs_only && !kt->cert) || (plain_only && kt->cert))
204 continue;
205 if (ret != NULL)
206 ret[rlen++] = '\n';
207 nlen = strlen(kt->name);
208 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
209 free(ret);
210 return NULL;
211 }
212 ret = tmp;
213 memcpy(ret + rlen, kt->name, nlen + 1);
214 rlen += nlen;
215 }
216 return ret;
217 }
218
219 int
220 sshkey_names_valid2(const char *names)
221 {
222 char *s, *cp, *p;
223
224 if (names == NULL || strcmp(names, "") == 0)
225 return 0;
226 if ((s = cp = strdup(names)) == NULL)
227 return 0;
228 for ((p = strsep(&cp, ",")); p && *p != '\0';
229 (p = strsep(&cp, ","))) {
230 switch (sshkey_type_from_name(p)) {
231 case KEY_RSA1:
232 case KEY_UNSPEC:
233 free(s);
234 return 0;
235 }
236 }
237 free(s);
238 return 1;
239 }
240
241 u_int
242 sshkey_size(const struct sshkey *k)
243 {
244 switch (k->type) {
245 #ifdef WITH_OPENSSL
246 case KEY_RSA1:
247 case KEY_RSA:
248 case KEY_RSA_CERT_V00:
249 case KEY_RSA_CERT:
250 return BN_num_bits(k->rsa->n);
251 case KEY_DSA:
252 case KEY_DSA_CERT_V00:
253 case KEY_DSA_CERT:
254 return BN_num_bits(k->dsa->p);
255 case KEY_ECDSA:
256 case KEY_ECDSA_CERT:
257 return sshkey_curve_nid_to_bits(k->ecdsa_nid);
258 #endif /* WITH_OPENSSL */
259 case KEY_ED25519:
260 case KEY_ED25519_CERT:
261 return 256; /* XXX */
262 }
263 return 0;
264 }
265
266 int
267 sshkey_cert_is_legacy(const struct sshkey *k)
268 {
269 switch (k->type) {
270 case KEY_DSA_CERT_V00:
271 case KEY_RSA_CERT_V00:
272 return 1;
273 default:
274 return 0;
275 }
276 }
277
278 static int
279 sshkey_type_is_valid_ca(int type)
280 {
281 switch (type) {
282 case KEY_RSA:
283 case KEY_DSA:
284 case KEY_ECDSA:
285 case KEY_ED25519:
286 return 1;
287 default:
288 return 0;
289 }
290 }
291
292 int
293 sshkey_is_cert(const struct sshkey *k)
294 {
295 if (k == NULL)
296 return 0;
297 return sshkey_type_is_cert(k->type);
298 }
299
300 /* Return the cert-less equivalent to a certified key type */
301 int
302 sshkey_type_plain(int type)
303 {
304 switch (type) {
305 case KEY_RSA_CERT_V00:
306 case KEY_RSA_CERT:
307 return KEY_RSA;
308 case KEY_DSA_CERT_V00:
309 case KEY_DSA_CERT:
310 return KEY_DSA;
311 case KEY_ECDSA_CERT:
312 return KEY_ECDSA;
313 case KEY_ED25519_CERT:
314 return KEY_ED25519;
315 default:
316 return type;
317 }
318 }
319
320 #ifdef WITH_OPENSSL
321 /* XXX: these are really begging for a table-driven approach */
322 int
323 sshkey_curve_name_to_nid(const char *name)
324 {
325 if (strcmp(name, "nistp256") == 0)
326 return NID_X9_62_prime256v1;
327 else if (strcmp(name, "nistp384") == 0)
328 return NID_secp384r1;
329 # ifdef OPENSSL_HAS_NISTP521
330 else if (strcmp(name, "nistp521") == 0)
331 return NID_secp521r1;
332 # endif /* OPENSSL_HAS_NISTP521 */
333 else
334 return -1;
335 }
336
337 u_int
338 sshkey_curve_nid_to_bits(int nid)
339 {
340 switch (nid) {
341 case NID_X9_62_prime256v1:
342 return 256;
343 case NID_secp384r1:
344 return 384;
345 # ifdef OPENSSL_HAS_NISTP521
346 case NID_secp521r1:
347 return 521;
348 # endif /* OPENSSL_HAS_NISTP521 */
349 default:
350 return 0;
351 }
352 }
353
354 int
355 sshkey_ecdsa_bits_to_nid(int bits)
356 {
357 switch (bits) {
358 case 256:
359 return NID_X9_62_prime256v1;
360 case 384:
361 return NID_secp384r1;
362 # ifdef OPENSSL_HAS_NISTP521
363 case 521:
364 return NID_secp521r1;
365 # endif /* OPENSSL_HAS_NISTP521 */
366 default:
367 return -1;
368 }
369 }
370
371 const char *
372 sshkey_curve_nid_to_name(int nid)
373 {
374 switch (nid) {
375 case NID_X9_62_prime256v1:
376 return "nistp256";
377 case NID_secp384r1:
378 return "nistp384";
379 # ifdef OPENSSL_HAS_NISTP521
380 case NID_secp521r1:
381 return "nistp521";
382 # endif /* OPENSSL_HAS_NISTP521 */
383 default:
384 return NULL;
385 }
386 }
387
388 int
389 sshkey_ec_nid_to_hash_alg(int nid)
390 {
391 int kbits = sshkey_curve_nid_to_bits(nid);
392
393 if (kbits <= 0)
394 return -1;
395
396 /* RFC5656 section 6.2.1 */
397 if (kbits <= 256)
398 return SSH_DIGEST_SHA256;
399 else if (kbits <= 384)
400 return SSH_DIGEST_SHA384;
401 else
402 return SSH_DIGEST_SHA512;
403 }
404 #endif /* WITH_OPENSSL */
405
406 static void
407 cert_free(struct sshkey_cert *cert)
408 {
409 u_int i;
410
411 if (cert == NULL)
412 return;
413 if (cert->certblob != NULL)
414 sshbuf_free(cert->certblob);
415 if (cert->critical != NULL)
416 sshbuf_free(cert->critical);
417 if (cert->extensions != NULL)
418 sshbuf_free(cert->extensions);
419 if (cert->key_id != NULL)
420 free(cert->key_id);
421 for (i = 0; i < cert->nprincipals; i++)
422 free(cert->principals[i]);
423 if (cert->principals != NULL)
424 free(cert->principals);
425 if (cert->signature_key != NULL)
426 sshkey_free(cert->signature_key);
427 explicit_bzero(cert, sizeof(*cert));
428 free(cert);
429 }
430
431 static struct sshkey_cert *
432 cert_new(void)
433 {
434 struct sshkey_cert *cert;
435
436 if ((cert = calloc(1, sizeof(*cert))) == NULL)
437 return NULL;
438 if ((cert->certblob = sshbuf_new()) == NULL ||
439 (cert->critical = sshbuf_new()) == NULL ||
440 (cert->extensions = sshbuf_new()) == NULL) {
441 cert_free(cert);
442 return NULL;
443 }
444 cert->key_id = NULL;
445 cert->principals = NULL;
446 cert->signature_key = NULL;
447 return cert;
448 }
449
450 struct sshkey *
451 sshkey_new(int type)
452 {
453 struct sshkey *k;
454 #ifdef WITH_OPENSSL
455 RSA *rsa;
456 DSA *dsa;
457 #endif /* WITH_OPENSSL */
458
459 if ((k = calloc(1, sizeof(*k))) == NULL)
460 return NULL;
461 k->type = type;
462 k->ecdsa = NULL;
463 k->ecdsa_nid = -1;
464 k->dsa = NULL;
465 k->rsa = NULL;
466 k->cert = NULL;
467 k->ed25519_sk = NULL;
468 k->ed25519_pk = NULL;
469 switch (k->type) {
470 #ifdef WITH_OPENSSL
471 case KEY_RSA1:
472 case KEY_RSA:
473 case KEY_RSA_CERT_V00:
474 case KEY_RSA_CERT:
475 if ((rsa = RSA_new()) == NULL ||
476 (rsa->n = BN_new()) == NULL ||
477 (rsa->e = BN_new()) == NULL) {
478 if (rsa != NULL)
479 RSA_free(rsa);
480 free(k);
481 return NULL;
482 }
483 k->rsa = rsa;
484 break;
485 case KEY_DSA:
486 case KEY_DSA_CERT_V00:
487 case KEY_DSA_CERT:
488 if ((dsa = DSA_new()) == NULL ||
489 (dsa->p = BN_new()) == NULL ||
490 (dsa->q = BN_new()) == NULL ||
491 (dsa->g = BN_new()) == NULL ||
492 (dsa->pub_key = BN_new()) == NULL) {
493 if (dsa != NULL)
494 DSA_free(dsa);
495 free(k);
496 return NULL;
497 }
498 k->dsa = dsa;
499 break;
500 case KEY_ECDSA:
501 case KEY_ECDSA_CERT:
502 /* Cannot do anything until we know the group */
503 break;
504 #endif /* WITH_OPENSSL */
505 case KEY_ED25519:
506 case KEY_ED25519_CERT:
507 /* no need to prealloc */
508 break;
509 case KEY_UNSPEC:
510 break;
511 default:
512 free(k);
513 return NULL;
514 break;
515 }
516
517 if (sshkey_is_cert(k)) {
518 if ((k->cert = cert_new()) == NULL) {
519 sshkey_free(k);
520 return NULL;
521 }
522 }
523
524 return k;
525 }
526
527 int
528 sshkey_add_private(struct sshkey *k)
529 {
530 switch (k->type) {
531 #ifdef WITH_OPENSSL
532 case KEY_RSA1:
533 case KEY_RSA:
534 case KEY_RSA_CERT_V00:
535 case KEY_RSA_CERT:
536 #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
537 if (bn_maybe_alloc_failed(k->rsa->d) ||
538 bn_maybe_alloc_failed(k->rsa->iqmp) ||
539 bn_maybe_alloc_failed(k->rsa->q) ||
540 bn_maybe_alloc_failed(k->rsa->p) ||
541 bn_maybe_alloc_failed(k->rsa->dmq1) ||
542 bn_maybe_alloc_failed(k->rsa->dmp1))
543 return SSH_ERR_ALLOC_FAIL;
544 break;
545 case KEY_DSA:
546 case KEY_DSA_CERT_V00:
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_V00:
593 case KEY_RSA_CERT:
594 if (k->rsa != NULL)
595 RSA_free(k->rsa);
596 k->rsa = NULL;
597 break;
598 case KEY_DSA:
599 case KEY_DSA_CERT_V00:
600 case KEY_DSA_CERT:
601 if (k->dsa != NULL)
602 DSA_free(k->dsa);
603 k->dsa = NULL;
604 break;
605 # ifdef OPENSSL_HAS_ECC
606 case KEY_ECDSA:
607 case KEY_ECDSA_CERT:
608 if (k->ecdsa != NULL)
609 EC_KEY_free(k->ecdsa);
610 k->ecdsa = NULL;
611 break;
612 # endif /* OPENSSL_HAS_ECC */
613 #endif /* WITH_OPENSSL */
614 case KEY_ED25519:
615 case KEY_ED25519_CERT:
616 if (k->ed25519_pk) {
617 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
618 free(k->ed25519_pk);
619 k->ed25519_pk = NULL;
620 }
621 if (k->ed25519_sk) {
622 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
623 free(k->ed25519_sk);
624 k->ed25519_sk = NULL;
625 }
626 break;
627 case KEY_UNSPEC:
628 break;
629 default:
630 break;
631 }
632 if (sshkey_is_cert(k))
633 cert_free(k->cert);
634 explicit_bzero(k, sizeof(*k));
635 free(k);
636 }
637
638 static int
639 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
640 {
641 if (a == NULL && b == NULL)
642 return 1;
643 if (a == NULL || b == NULL)
644 return 0;
645 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
646 return 0;
647 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
648 sshbuf_len(a->certblob)) != 0)
649 return 0;
650 return 1;
651 }
652
653 /*
654 * Compare public portions of key only, allowing comparisons between
655 * certificates and plain keys too.
656 */
657 int
658 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
659 {
660 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
661 BN_CTX *bnctx;
662 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
663
664 if (a == NULL || b == NULL ||
665 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
666 return 0;
667
668 switch (a->type) {
669 #ifdef WITH_OPENSSL
670 case KEY_RSA1:
671 case KEY_RSA_CERT_V00:
672 case KEY_RSA_CERT:
673 case KEY_RSA:
674 return a->rsa != NULL && b->rsa != NULL &&
675 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
676 BN_cmp(a->rsa->n, b->rsa->n) == 0;
677 case KEY_DSA_CERT_V00:
678 case KEY_DSA_CERT:
679 case KEY_DSA:
680 return a->dsa != NULL && b->dsa != NULL &&
681 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
682 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
683 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
684 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
685 # ifdef OPENSSL_HAS_ECC
686 case KEY_ECDSA_CERT:
687 case KEY_ECDSA:
688 if (a->ecdsa == NULL || b->ecdsa == NULL ||
689 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
690 EC_KEY_get0_public_key(b->ecdsa) == NULL)
691 return 0;
692 if ((bnctx = BN_CTX_new()) == NULL)
693 return 0;
694 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
695 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
696 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
697 EC_KEY_get0_public_key(a->ecdsa),
698 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
699 BN_CTX_free(bnctx);
700 return 0;
701 }
702 BN_CTX_free(bnctx);
703 return 1;
704 # endif /* OPENSSL_HAS_ECC */
705 #endif /* WITH_OPENSSL */
706 case KEY_ED25519:
707 case KEY_ED25519_CERT:
708 return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
709 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
710 default:
711 return 0;
712 }
713 /* NOTREACHED */
714 }
715
716 int
717 sshkey_equal(const struct sshkey *a, const struct sshkey *b)
718 {
719 if (a == NULL || b == NULL || a->type != b->type)
720 return 0;
721 if (sshkey_is_cert(a)) {
722 if (!cert_compare(a->cert, b->cert))
723 return 0;
724 }
725 return sshkey_equal_public(a, b);
726 }
727
728 static int
729 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
730 {
731 int type, ret = SSH_ERR_INTERNAL_ERROR;
732 const char *typename;
733
734 if (key == NULL)
735 return SSH_ERR_INVALID_ARGUMENT;
736
737 type = force_plain ? sshkey_type_plain(key->type) : key->type;
738 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
739
740 switch (type) {
741 #ifdef WITH_OPENSSL
742 case KEY_DSA_CERT_V00:
743 case KEY_RSA_CERT_V00:
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_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
801 {
802 return to_blob_buf(key, b, 0);
803 }
804
805 int
806 sshkey_plain_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
807 {
808 return to_blob_buf(key, b, 1);
809 }
810
811 static int
812 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
813 {
814 int ret = SSH_ERR_INTERNAL_ERROR;
815 size_t len;
816 struct sshbuf *b = NULL;
817
818 if (lenp != NULL)
819 *lenp = 0;
820 if (blobp != NULL)
821 *blobp = NULL;
822 if ((b = sshbuf_new()) == NULL)
823 return SSH_ERR_ALLOC_FAIL;
824 if ((ret = to_blob_buf(key, b, force_plain)) != 0)
825 goto out;
826 len = sshbuf_len(b);
827 if (lenp != NULL)
828 *lenp = len;
829 if (blobp != NULL) {
830 if ((*blobp = malloc(len)) == NULL) {
831 ret = SSH_ERR_ALLOC_FAIL;
832 goto out;
833 }
834 memcpy(*blobp, sshbuf_ptr(b), len);
835 }
836 ret = 0;
837 out:
838 sshbuf_free(b);
839 return ret;
840 }
841
842 int
843 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
844 {
845 return to_blob(key, blobp, lenp, 0);
846 }
847
848 int
849 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
850 {
851 return to_blob(key, blobp, lenp, 1);
852 }
853
854 int
855 sshkey_fingerprint_raw(const struct sshkey *k, enum sshkey_fp_type dgst_type,
856 u_char **retp, size_t *lenp)
857 {
858 u_char *blob = NULL, *ret = NULL;
859 size_t blob_len = 0;
860 int hash_alg = -1, r = SSH_ERR_INTERNAL_ERROR;
861
862 if (retp != NULL)
863 *retp = NULL;
864 if (lenp != NULL)
865 *lenp = 0;
866
867 switch (dgst_type) {
868 case SSH_FP_MD5:
869 hash_alg = SSH_DIGEST_MD5;
870 break;
871 case SSH_FP_SHA1:
872 hash_alg = SSH_DIGEST_SHA1;
873 break;
874 case SSH_FP_SHA256:
875 hash_alg = SSH_DIGEST_SHA256;
876 break;
877 default:
878 r = SSH_ERR_INVALID_ARGUMENT;
879 goto out;
880 }
881
882 if (k->type == KEY_RSA1) {
883 #ifdef WITH_OPENSSL
884 int nlen = BN_num_bytes(k->rsa->n);
885 int elen = BN_num_bytes(k->rsa->e);
886
887 blob_len = nlen + elen;
888 if (nlen >= INT_MAX - elen ||
889 (blob = malloc(blob_len)) == NULL) {
890 r = SSH_ERR_ALLOC_FAIL;
891 goto out;
892 }
893 BN_bn2bin(k->rsa->n, blob);
894 BN_bn2bin(k->rsa->e, blob + nlen);
895 #endif /* WITH_OPENSSL */
896 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
897 goto out;
898 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
899 r = SSH_ERR_ALLOC_FAIL;
900 goto out;
901 }
902 if ((r = ssh_digest_memory(hash_alg, blob, blob_len,
903 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
904 goto out;
905 /* success */
906 if (retp != NULL) {
907 *retp = ret;
908 ret = NULL;
909 }
910 if (lenp != NULL)
911 *lenp = ssh_digest_bytes(hash_alg);
912 r = 0;
913 out:
914 free(ret);
915 if (blob != NULL) {
916 explicit_bzero(blob, blob_len);
917 free(blob);
918 }
919 return r;
920 }
921
922 static char *
923 fingerprint_hex(u_char *dgst_raw, size_t dgst_raw_len)
924 {
925 char *retval;
926 size_t i;
927
928 if ((retval = calloc(1, dgst_raw_len * 3 + 1)) == NULL)
929 return NULL;
930 for (i = 0; i < dgst_raw_len; i++) {
931 char hex[4];
932 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
933 strlcat(retval, hex, dgst_raw_len * 3 + 1);
934 }
935
936 /* Remove the trailing ':' character */
937 retval[(dgst_raw_len * 3) - 1] = '\0';
938 return retval;
939 }
940
941 static char *
942 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
943 {
944 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
945 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
946 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
947 u_int i, j = 0, rounds, seed = 1;
948 char *retval;
949
950 rounds = (dgst_raw_len / 2) + 1;
951 if ((retval = calloc(rounds, 6)) == NULL)
952 return NULL;
953 retval[j++] = 'x';
954 for (i = 0; i < rounds; i++) {
955 u_int idx0, idx1, idx2, idx3, idx4;
956 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
957 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
958 seed) % 6;
959 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
960 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
961 (seed / 6)) % 6;
962 retval[j++] = vowels[idx0];
963 retval[j++] = consonants[idx1];
964 retval[j++] = vowels[idx2];
965 if ((i + 1) < rounds) {
966 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
967 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
968 retval[j++] = consonants[idx3];
969 retval[j++] = '-';
970 retval[j++] = consonants[idx4];
971 seed = ((seed * 5) +
972 ((((u_int)(dgst_raw[2 * i])) * 7) +
973 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
974 }
975 } else {
976 idx0 = seed % 6;
977 idx1 = 16;
978 idx2 = seed / 6;
979 retval[j++] = vowels[idx0];
980 retval[j++] = consonants[idx1];
981 retval[j++] = vowels[idx2];
982 }
983 }
984 retval[j++] = 'x';
985 retval[j++] = '\0';
986 return retval;
987 }
988
989 /*
990 * Draw an ASCII-Art representing the fingerprint so human brain can
991 * profit from its built-in pattern recognition ability.
992 * This technique is called "random art" and can be found in some
993 * scientific publications like this original paper:
994 *
995 * "Hash Visualization: a New Technique to improve Real-World Security",
996 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
997 * Techniques and E-Commerce (CrypTEC '99)
998 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
999 *
1000 * The subject came up in a talk by Dan Kaminsky, too.
1001 *
1002 * If you see the picture is different, the key is different.
1003 * If the picture looks the same, you still know nothing.
1004 *
1005 * The algorithm used here is a worm crawling over a discrete plane,
1006 * leaving a trace (augmenting the field) everywhere it goes.
1007 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1008 * makes the respective movement vector be ignored for this turn.
1009 * Graphs are not unambiguous, because circles in graphs can be
1010 * walked in either direction.
1011 */
1012
1013 /*
1014 * Field sizes for the random art. Have to be odd, so the starting point
1015 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1016 * Else pictures would be too dense, and drawing the frame would
1017 * fail, too, because the key type would not fit in anymore.
1018 */
1019 #define FLDBASE 8
1020 #define FLDSIZE_Y (FLDBASE + 1)
1021 #define FLDSIZE_X (FLDBASE * 2 + 1)
1022 static char *
1023 fingerprint_randomart(u_char *dgst_raw, size_t dgst_raw_len,
1024 const struct sshkey *k)
1025 {
1026 /*
1027 * Chars to be used after each other every time the worm
1028 * intersects with itself. Matter of taste.
1029 */
1030 char *augmentation_string = " .o+=*BOX@%&#/^SE";
1031 char *retval, *p, title[FLDSIZE_X];
1032 u_char field[FLDSIZE_X][FLDSIZE_Y];
1033 size_t i, tlen;
1034 u_int b;
1035 int x, y, r;
1036 size_t len = strlen(augmentation_string) - 1;
1037
1038 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1039 return NULL;
1040
1041 /* initialize field */
1042 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1043 x = FLDSIZE_X / 2;
1044 y = FLDSIZE_Y / 2;
1045
1046 /* process raw key */
1047 for (i = 0; i < dgst_raw_len; i++) {
1048 int input;
1049 /* each byte conveys four 2-bit move commands */
1050 input = dgst_raw[i];
1051 for (b = 0; b < 4; b++) {
1052 /* evaluate 2 bit, rest is shifted later */
1053 x += (input & 0x1) ? 1 : -1;
1054 y += (input & 0x2) ? 1 : -1;
1055
1056 /* assure we are still in bounds */
1057 x = MAX(x, 0);
1058 y = MAX(y, 0);
1059 x = MIN(x, FLDSIZE_X - 1);
1060 y = MIN(y, FLDSIZE_Y - 1);
1061
1062 /* augment the field */
1063 if (field[x][y] < len - 2)
1064 field[x][y]++;
1065 input = input >> 2;
1066 }
1067 }
1068
1069 /* mark starting point and end point*/
1070 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1071 field[x][y] = len;
1072
1073 /* assemble title */
1074 r = snprintf(title, sizeof(title), "[%s %u]",
1075 sshkey_type(k), sshkey_size(k));
1076 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1077 if (r < 0 || r > (int)sizeof(title))
1078 snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1079 tlen = strlen(title);
1080
1081 /* output upper border */
1082 p = retval;
1083 *p++ = '+';
1084 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1085 *p++ = '-';
1086 memcpy(p, title, tlen);
1087 p += tlen;
1088 for (i = p - retval - 1; i < FLDSIZE_X; i++)
1089 *p++ = '-';
1090 *p++ = '+';
1091 *p++ = '\n';
1092
1093 /* output content */
1094 for (y = 0; y < FLDSIZE_Y; y++) {
1095 *p++ = '|';
1096 for (x = 0; x < FLDSIZE_X; x++)
1097 *p++ = augmentation_string[MIN(field[x][y], len)];
1098 *p++ = '|';
1099 *p++ = '\n';
1100 }
1101
1102 /* output lower border */
1103 *p++ = '+';
1104 for (i = 0; i < FLDSIZE_X; i++)
1105 *p++ = '-';
1106 *p++ = '+';
1107
1108 return retval;
1109 }
1110
1111 char *
1112 sshkey_fingerprint(const struct sshkey *k, enum sshkey_fp_type dgst_type,
1113 enum sshkey_fp_rep dgst_rep)
1114 {
1115 char *retval = NULL;
1116 u_char *dgst_raw;
1117 size_t dgst_raw_len;
1118
1119 if (sshkey_fingerprint_raw(k, dgst_type, &dgst_raw, &dgst_raw_len) != 0)
1120 return NULL;
1121 switch (dgst_rep) {
1122 case SSH_FP_HEX:
1123 retval = fingerprint_hex(dgst_raw, dgst_raw_len);
1124 break;
1125 case SSH_FP_BUBBLEBABBLE:
1126 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1127 break;
1128 case SSH_FP_RANDOMART:
1129 retval = fingerprint_randomart(dgst_raw, dgst_raw_len, k);
1130 break;
1131 default:
1132 explicit_bzero(dgst_raw, dgst_raw_len);
1133 free(dgst_raw);
1134 return NULL;
1135 }
1136 explicit_bzero(dgst_raw, dgst_raw_len);
1137 free(dgst_raw);
1138 return retval;
1139 }
1140
1141 #ifdef WITH_SSH1
1142 /*
1143 * Reads a multiple-precision integer in decimal from the buffer, and advances
1144 * the pointer. The integer must already be initialized. This function is
1145 * permitted to modify the buffer. This leaves *cpp to point just beyond the
1146 * last processed character.
1147 */
1148 static int
1149 read_decimal_bignum(char **cpp, BIGNUM *v)
1150 {
1151 char *cp;
1152 size_t e;
1153 int skip = 1; /* skip white space */
1154
1155 cp = *cpp;
1156 while (*cp == ' ' || *cp == '\t')
1157 cp++;
1158 e = strspn(cp, "0123456789");
1159 if (e == 0)
1160 return SSH_ERR_INVALID_FORMAT;
1161 if (e > SSHBUF_MAX_BIGNUM * 3)
1162 return SSH_ERR_BIGNUM_TOO_LARGE;
1163 if (cp[e] == '\0')
1164 skip = 0;
1165 else if (index(" \t\r\n", cp[e]) == NULL)
1166 return SSH_ERR_INVALID_FORMAT;
1167 cp[e] = '\0';
1168 if (BN_dec2bn(&v, cp) <= 0)
1169 return SSH_ERR_INVALID_FORMAT;
1170 *cpp = cp + e + skip;
1171 return 0;
1172 }
1173 #endif /* WITH_SSH1 */
1174
1175 /* returns 0 ok, and < 0 error */
1176 int
1177 sshkey_read(struct sshkey *ret, char **cpp)
1178 {
1179 struct sshkey *k;
1180 int retval = SSH_ERR_INVALID_FORMAT;
1181 char *cp, *space;
1182 int r, type, curve_nid = -1;
1183 struct sshbuf *blob;
1184 #ifdef WITH_SSH1
1185 char *ep;
1186 u_long bits;
1187 #endif /* WITH_SSH1 */
1188
1189 cp = *cpp;
1190
1191 switch (ret->type) {
1192 case KEY_RSA1:
1193 #ifdef WITH_SSH1
1194 /* Get number of bits. */
1195 bits = strtoul(cp, &ep, 10);
1196 if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1197 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1198 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1199 /* Get public exponent, public modulus. */
1200 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1201 return r;
1202 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1203 return r;
1204 *cpp = ep;
1205 /* validate the claimed number of bits */
1206 if (BN_num_bits(ret->rsa->n) != (int)bits)
1207 return SSH_ERR_KEY_BITS_MISMATCH;
1208 retval = 0;
1209 #endif /* WITH_SSH1 */
1210 break;
1211 case KEY_UNSPEC:
1212 case KEY_RSA:
1213 case KEY_DSA:
1214 case KEY_ECDSA:
1215 case KEY_ED25519:
1216 case KEY_DSA_CERT_V00:
1217 case KEY_RSA_CERT_V00:
1218 case KEY_DSA_CERT:
1219 case KEY_ECDSA_CERT:
1220 case KEY_RSA_CERT:
1221 case KEY_ED25519_CERT:
1222 space = strchr(cp, ' ');
1223 if (space == NULL)
1224 return SSH_ERR_INVALID_FORMAT;
1225 *space = '\0';
1226 type = sshkey_type_from_name(cp);
1227 if (sshkey_type_plain(type) == KEY_ECDSA &&
1228 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1229 return SSH_ERR_EC_CURVE_INVALID;
1230 *space = ' ';
1231 if (type == KEY_UNSPEC)
1232 return SSH_ERR_INVALID_FORMAT;
1233 cp = space+1;
1234 if (*cp == '\0')
1235 return SSH_ERR_INVALID_FORMAT;
1236 if (ret->type == KEY_UNSPEC) {
1237 ret->type = type;
1238 } else if (ret->type != type)
1239 return SSH_ERR_KEY_TYPE_MISMATCH;
1240 if ((blob = sshbuf_new()) == NULL)
1241 return SSH_ERR_ALLOC_FAIL;
1242 /* trim comment */
1243 space = strchr(cp, ' ');
1244 if (space)
1245 *space = '\0';
1246 if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1247 sshbuf_free(blob);
1248 return r;
1249 }
1250 if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1251 sshbuf_len(blob), &k)) != 0) {
1252 sshbuf_free(blob);
1253 return r;
1254 }
1255 sshbuf_free(blob);
1256 if (k->type != type) {
1257 sshkey_free(k);
1258 return SSH_ERR_KEY_TYPE_MISMATCH;
1259 }
1260 if (sshkey_type_plain(type) == KEY_ECDSA &&
1261 curve_nid != k->ecdsa_nid) {
1262 sshkey_free(k);
1263 return SSH_ERR_EC_CURVE_MISMATCH;
1264 }
1265 /*XXXX*/
1266 if (sshkey_is_cert(ret)) {
1267 if (!sshkey_is_cert(k)) {
1268 sshkey_free(k);
1269 return SSH_ERR_EXPECTED_CERT;
1270 }
1271 if (ret->cert != NULL)
1272 cert_free(ret->cert);
1273 ret->cert = k->cert;
1274 k->cert = NULL;
1275 }
1276 #ifdef WITH_OPENSSL
1277 if (sshkey_type_plain(ret->type) == KEY_RSA) {
1278 if (ret->rsa != NULL)
1279 RSA_free(ret->rsa);
1280 ret->rsa = k->rsa;
1281 k->rsa = NULL;
1282 #ifdef DEBUG_PK
1283 RSA_print_fp(stderr, ret->rsa, 8);
1284 #endif
1285 }
1286 if (sshkey_type_plain(ret->type) == KEY_DSA) {
1287 if (ret->dsa != NULL)
1288 DSA_free(ret->dsa);
1289 ret->dsa = k->dsa;
1290 k->dsa = NULL;
1291 #ifdef DEBUG_PK
1292 DSA_print_fp(stderr, ret->dsa, 8);
1293 #endif
1294 }
1295 # ifdef OPENSSL_HAS_ECC
1296 if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1297 if (ret->ecdsa != NULL)
1298 EC_KEY_free(ret->ecdsa);
1299 ret->ecdsa = k->ecdsa;
1300 ret->ecdsa_nid = k->ecdsa_nid;
1301 k->ecdsa = NULL;
1302 k->ecdsa_nid = -1;
1303 #ifdef DEBUG_PK
1304 sshkey_dump_ec_key(ret->ecdsa);
1305 #endif
1306 }
1307 # endif /* OPENSSL_HAS_ECC */
1308 #endif /* WITH_OPENSSL */
1309 if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1310 free(ret->ed25519_pk);
1311 ret->ed25519_pk = k->ed25519_pk;
1312 k->ed25519_pk = NULL;
1313 #ifdef DEBUG_PK
1314 /* XXX */
1315 #endif
1316 }
1317 retval = 0;
1318 /*XXXX*/
1319 sshkey_free(k);
1320 if (retval != 0)
1321 break;
1322 /* advance cp: skip whitespace and data */
1323 while (*cp == ' ' || *cp == '\t')
1324 cp++;
1325 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
1326 cp++;
1327 *cpp = cp;
1328 break;
1329 default:
1330 return SSH_ERR_INVALID_ARGUMENT;
1331 }
1332 return retval;
1333 }
1334
1335 int
1336 sshkey_write(const struct sshkey *key, FILE *f)
1337 {
1338 int ret = SSH_ERR_INTERNAL_ERROR;
1339 struct sshbuf *b = NULL, *bb = NULL;
1340 char *uu = NULL;
1341 #ifdef WITH_SSH1
1342 u_int bits = 0;
1343 char *dec_e = NULL, *dec_n = NULL;
1344 #endif /* WITH_SSH1 */
1345
1346 if (sshkey_is_cert(key)) {
1347 if (key->cert == NULL)
1348 return SSH_ERR_EXPECTED_CERT;
1349 if (sshbuf_len(key->cert->certblob) == 0)
1350 return SSH_ERR_KEY_LACKS_CERTBLOB;
1351 }
1352 if ((b = sshbuf_new()) == NULL)
1353 return SSH_ERR_ALLOC_FAIL;
1354 switch (key->type) {
1355 #ifdef WITH_SSH1
1356 case KEY_RSA1:
1357 if (key->rsa == NULL || key->rsa->e == NULL ||
1358 key->rsa->n == NULL) {
1359 ret = SSH_ERR_INVALID_ARGUMENT;
1360 goto out;
1361 }
1362 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1363 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1364 ret = SSH_ERR_ALLOC_FAIL;
1365 goto out;
1366 }
1367 /* size of modulus 'n' */
1368 if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1369 ret = SSH_ERR_INVALID_ARGUMENT;
1370 goto out;
1371 }
1372 if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1373 goto out;
1374 #endif /* WITH_SSH1 */
1375 break;
1376 #ifdef WITH_OPENSSL
1377 case KEY_DSA:
1378 case KEY_DSA_CERT_V00:
1379 case KEY_DSA_CERT:
1380 case KEY_ECDSA:
1381 case KEY_ECDSA_CERT:
1382 case KEY_RSA:
1383 case KEY_RSA_CERT_V00:
1384 case KEY_RSA_CERT:
1385 #endif /* WITH_OPENSSL */
1386 case KEY_ED25519:
1387 case KEY_ED25519_CERT:
1388 if ((bb = sshbuf_new()) == NULL) {
1389 ret = SSH_ERR_ALLOC_FAIL;
1390 goto out;
1391 }
1392 if ((ret = sshkey_to_blob_buf(key, bb)) != 0)
1393 goto out;
1394 if ((uu = sshbuf_dtob64(bb)) == NULL) {
1395 ret = SSH_ERR_ALLOC_FAIL;
1396 goto out;
1397 }
1398 if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
1399 goto out;
1400 if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
1401 goto out;
1402 break;
1403 default:
1404 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1405 goto out;
1406 }
1407 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1408 if (feof(f))
1409 errno = EPIPE;
1410 ret = SSH_ERR_SYSTEM_ERROR;
1411 goto out;
1412 }
1413 ret = 0;
1414 out:
1415 if (b != NULL)
1416 sshbuf_free(b);
1417 if (bb != NULL)
1418 sshbuf_free(bb);
1419 if (uu != NULL)
1420 free(uu);
1421 #ifdef WITH_SSH1
1422 if (dec_e != NULL)
1423 OPENSSL_free(dec_e);
1424 if (dec_n != NULL)
1425 OPENSSL_free(dec_n);
1426 #endif /* WITH_SSH1 */
1427 return ret;
1428 }
1429
1430 const char *
1431 sshkey_cert_type(const struct sshkey *k)
1432 {
1433 switch (k->cert->type) {
1434 case SSH2_CERT_TYPE_USER:
1435 return "user";
1436 case SSH2_CERT_TYPE_HOST:
1437 return "host";
1438 default:
1439 return "unknown";
1440 }
1441 }
1442
1443 #ifdef WITH_OPENSSL
1444 static int
1445 rsa_generate_private_key(u_int bits, RSA **rsap)
1446 {
1447 RSA *private = NULL;
1448 BIGNUM *f4 = NULL;
1449 int ret = SSH_ERR_INTERNAL_ERROR;
1450
1451 if (rsap == NULL ||
1452 bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1453 bits > SSHBUF_MAX_BIGNUM * 8)
1454 return SSH_ERR_INVALID_ARGUMENT;
1455 *rsap = NULL;
1456 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1457 ret = SSH_ERR_ALLOC_FAIL;
1458 goto out;
1459 }
1460 if (!BN_set_word(f4, RSA_F4) ||
1461 !RSA_generate_key_ex(private, bits, f4, NULL)) {
1462 ret = SSH_ERR_LIBCRYPTO_ERROR;
1463 goto out;
1464 }
1465 *rsap = private;
1466 private = NULL;
1467 ret = 0;
1468 out:
1469 if (private != NULL)
1470 RSA_free(private);
1471 if (f4 != NULL)
1472 BN_free(f4);
1473 return ret;
1474 }
1475
1476 static int
1477 dsa_generate_private_key(u_int bits, DSA **dsap)
1478 {
1479 DSA *private;
1480 int ret = SSH_ERR_INTERNAL_ERROR;
1481
1482 if (dsap == NULL || bits != 1024)
1483 return SSH_ERR_INVALID_ARGUMENT;
1484 if ((private = DSA_new()) == NULL) {
1485 ret = SSH_ERR_ALLOC_FAIL;
1486 goto out;
1487 }
1488 *dsap = NULL;
1489 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1490 NULL, NULL) || !DSA_generate_key(private)) {
1491 DSA_free(private);
1492 ret = SSH_ERR_LIBCRYPTO_ERROR;
1493 goto out;
1494 }
1495 *dsap = private;
1496 private = NULL;
1497 ret = 0;
1498 out:
1499 if (private != NULL)
1500 DSA_free(private);
1501 return ret;
1502 }
1503
1504 # ifdef OPENSSL_HAS_ECC
1505 int
1506 sshkey_ecdsa_key_to_nid(EC_KEY *k)
1507 {
1508 EC_GROUP *eg;
1509 int nids[] = {
1510 NID_X9_62_prime256v1,
1511 NID_secp384r1,
1512 # ifdef OPENSSL_HAS_NISTP521
1513 NID_secp521r1,
1514 # endif /* OPENSSL_HAS_NISTP521 */
1515 -1
1516 };
1517 int nid;
1518 u_int i;
1519 BN_CTX *bnctx;
1520 const EC_GROUP *g = EC_KEY_get0_group(k);
1521
1522 /*
1523 * The group may be stored in a ASN.1 encoded private key in one of two
1524 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1525 * or explicit group parameters encoded into the key blob. Only the
1526 * "named group" case sets the group NID for us, but we can figure
1527 * it out for the other case by comparing against all the groups that
1528 * are supported.
1529 */
1530 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1531 return nid;
1532 if ((bnctx = BN_CTX_new()) == NULL)
1533 return -1;
1534 for (i = 0; nids[i] != -1; i++) {
1535 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1536 BN_CTX_free(bnctx);
1537 return -1;
1538 }
1539 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1540 break;
1541 EC_GROUP_free(eg);
1542 }
1543 BN_CTX_free(bnctx);
1544 if (nids[i] != -1) {
1545 /* Use the group with the NID attached */
1546 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1547 if (EC_KEY_set_group(k, eg) != 1) {
1548 EC_GROUP_free(eg);
1549 return -1;
1550 }
1551 }
1552 return nids[i];
1553 }
1554
1555 static int
1556 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1557 {
1558 EC_KEY *private;
1559 int ret = SSH_ERR_INTERNAL_ERROR;
1560
1561 if (nid == NULL || ecdsap == NULL ||
1562 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1563 return SSH_ERR_INVALID_ARGUMENT;
1564 *ecdsap = NULL;
1565 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1566 ret = SSH_ERR_ALLOC_FAIL;
1567 goto out;
1568 }
1569 if (EC_KEY_generate_key(private) != 1) {
1570 ret = SSH_ERR_LIBCRYPTO_ERROR;
1571 goto out;
1572 }
1573 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1574 *ecdsap = private;
1575 private = NULL;
1576 ret = 0;
1577 out:
1578 if (private != NULL)
1579 EC_KEY_free(private);
1580 return ret;
1581 }
1582 # endif /* OPENSSL_HAS_ECC */
1583 #endif /* WITH_OPENSSL */
1584
1585 int
1586 sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1587 {
1588 struct sshkey *k;
1589 int ret = SSH_ERR_INTERNAL_ERROR;
1590
1591 if (keyp == NULL)
1592 return SSH_ERR_INVALID_ARGUMENT;
1593 *keyp = NULL;
1594 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1595 return SSH_ERR_ALLOC_FAIL;
1596 switch (type) {
1597 case KEY_ED25519:
1598 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1599 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1600 ret = SSH_ERR_ALLOC_FAIL;
1601 break;
1602 }
1603 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1604 ret = 0;
1605 break;
1606 #ifdef WITH_OPENSSL
1607 case KEY_DSA:
1608 ret = dsa_generate_private_key(bits, &k->dsa);
1609 break;
1610 # ifdef OPENSSL_HAS_ECC
1611 case KEY_ECDSA:
1612 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1613 &k->ecdsa);
1614 break;
1615 # endif /* OPENSSL_HAS_ECC */
1616 case KEY_RSA:
1617 case KEY_RSA1:
1618 ret = rsa_generate_private_key(bits, &k->rsa);
1619 break;
1620 #endif /* WITH_OPENSSL */
1621 default:
1622 ret = SSH_ERR_INVALID_ARGUMENT;
1623 }
1624 if (ret == 0) {
1625 k->type = type;
1626 *keyp = k;
1627 } else
1628 sshkey_free(k);
1629 return ret;
1630 }
1631
1632 int
1633 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1634 {
1635 u_int i;
1636 const struct sshkey_cert *from;
1637 struct sshkey_cert *to;
1638 int ret = SSH_ERR_INTERNAL_ERROR;
1639
1640 if (to_key->cert != NULL) {
1641 cert_free(to_key->cert);
1642 to_key->cert = NULL;
1643 }
1644
1645 if ((from = from_key->cert) == NULL)
1646 return SSH_ERR_INVALID_ARGUMENT;
1647
1648 if ((to = to_key->cert = cert_new()) == NULL)
1649 return SSH_ERR_ALLOC_FAIL;
1650
1651 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1652 (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1653 (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1654 return ret;
1655
1656 to->serial = from->serial;
1657 to->type = from->type;
1658 if (from->key_id == NULL)
1659 to->key_id = NULL;
1660 else if ((to->key_id = strdup(from->key_id)) == NULL)
1661 return SSH_ERR_ALLOC_FAIL;
1662 to->valid_after = from->valid_after;
1663 to->valid_before = from->valid_before;
1664 if (from->signature_key == NULL)
1665 to->signature_key = NULL;
1666 else if ((ret = sshkey_from_private(from->signature_key,
1667 &to->signature_key)) != 0)
1668 return ret;
1669
1670 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1671 return SSH_ERR_INVALID_ARGUMENT;
1672 if (from->nprincipals > 0) {
1673 if ((to->principals = calloc(from->nprincipals,
1674 sizeof(*to->principals))) == NULL)
1675 return SSH_ERR_ALLOC_FAIL;
1676 for (i = 0; i < from->nprincipals; i++) {
1677 to->principals[i] = strdup(from->principals[i]);
1678 if (to->principals[i] == NULL) {
1679 to->nprincipals = i;
1680 return SSH_ERR_ALLOC_FAIL;
1681 }
1682 }
1683 }
1684 to->nprincipals = from->nprincipals;
1685 return 0;
1686 }
1687
1688 int
1689 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1690 {
1691 struct sshkey *n = NULL;
1692 int ret = SSH_ERR_INTERNAL_ERROR;
1693
1694 if (pkp != NULL)
1695 *pkp = NULL;
1696
1697 switch (k->type) {
1698 #ifdef WITH_OPENSSL
1699 case KEY_DSA:
1700 case KEY_DSA_CERT_V00:
1701 case KEY_DSA_CERT:
1702 if ((n = sshkey_new(k->type)) == NULL)
1703 return SSH_ERR_ALLOC_FAIL;
1704 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1705 (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1706 (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1707 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1708 sshkey_free(n);
1709 return SSH_ERR_ALLOC_FAIL;
1710 }
1711 break;
1712 # ifdef OPENSSL_HAS_ECC
1713 case KEY_ECDSA:
1714 case KEY_ECDSA_CERT:
1715 if ((n = sshkey_new(k->type)) == NULL)
1716 return SSH_ERR_ALLOC_FAIL;
1717 n->ecdsa_nid = k->ecdsa_nid;
1718 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1719 if (n->ecdsa == NULL) {
1720 sshkey_free(n);
1721 return SSH_ERR_ALLOC_FAIL;
1722 }
1723 if (EC_KEY_set_public_key(n->ecdsa,
1724 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1725 sshkey_free(n);
1726 return SSH_ERR_LIBCRYPTO_ERROR;
1727 }
1728 break;
1729 # endif /* OPENSSL_HAS_ECC */
1730 case KEY_RSA:
1731 case KEY_RSA1:
1732 case KEY_RSA_CERT_V00:
1733 case KEY_RSA_CERT:
1734 if ((n = sshkey_new(k->type)) == NULL)
1735 return SSH_ERR_ALLOC_FAIL;
1736 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1737 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1738 sshkey_free(n);
1739 return SSH_ERR_ALLOC_FAIL;
1740 }
1741 break;
1742 #endif /* WITH_OPENSSL */
1743 case KEY_ED25519:
1744 case KEY_ED25519_CERT:
1745 if ((n = sshkey_new(k->type)) == NULL)
1746 return SSH_ERR_ALLOC_FAIL;
1747 if (k->ed25519_pk != NULL) {
1748 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1749 sshkey_free(n);
1750 return SSH_ERR_ALLOC_FAIL;
1751 }
1752 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1753 }
1754 break;
1755 default:
1756 return SSH_ERR_KEY_TYPE_UNKNOWN;
1757 }
1758 if (sshkey_is_cert(k)) {
1759 if ((ret = sshkey_cert_copy(k, n)) != 0) {
1760 sshkey_free(n);
1761 return ret;
1762 }
1763 }
1764 *pkp = n;
1765 return 0;
1766 }
1767
1768 static int
1769 cert_parse(struct sshbuf *b, struct sshkey *key, const u_char *blob,
1770 size_t blen)
1771 {
1772 u_char *principals = NULL, *critical = NULL, *exts = NULL;
1773 u_char *sig_key = NULL, *sig = NULL;
1774 size_t signed_len, plen, clen, sklen, slen, kidlen, elen;
1775 struct sshbuf *tmp;
1776 char *principal;
1777 int ret = SSH_ERR_INTERNAL_ERROR;
1778 int v00 = sshkey_cert_is_legacy(key);
1779 char **oprincipals;
1780
1781 if ((tmp = sshbuf_new()) == NULL)
1782 return SSH_ERR_ALLOC_FAIL;
1783
1784 /* Copy the entire key blob for verification and later serialisation */
1785 if ((ret = sshbuf_put(key->cert->certblob, blob, blen)) != 0)
1786 return ret;
1787
1788 elen = 0; /* Not touched for v00 certs */
1789 principals = exts = critical = sig_key = sig = NULL;
1790 if ((!v00 && (ret = sshbuf_get_u64(b, &key->cert->serial)) != 0) ||
1791 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1792 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1793 (ret = sshbuf_get_string(b, &principals, &plen)) != 0 ||
1794 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1795 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1796 (ret = sshbuf_get_string(b, &critical, &clen)) != 0 ||
1797 (!v00 && (ret = sshbuf_get_string(b, &exts, &elen)) != 0) ||
1798 (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
1799 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1800 (ret = sshbuf_get_string(b, &sig_key, &sklen)) != 0) {
1801 /* XXX debug print error for ret */
1802 ret = SSH_ERR_INVALID_FORMAT;
1803 goto out;
1804 }
1805
1806 /* Signature is left in the buffer so we can calculate this length */
1807 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1808
1809 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1810 ret = SSH_ERR_INVALID_FORMAT;
1811 goto out;
1812 }
1813
1814 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1815 key->cert->type != SSH2_CERT_TYPE_HOST) {
1816 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1817 goto out;
1818 }
1819
1820 if ((ret = sshbuf_put(tmp, principals, plen)) != 0)
1821 goto out;
1822 while (sshbuf_len(tmp) > 0) {
1823 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1824 ret = SSH_ERR_INVALID_FORMAT;
1825 goto out;
1826 }
1827 if ((ret = sshbuf_get_cstring(tmp, &principal, &plen)) != 0) {
1828 ret = SSH_ERR_INVALID_FORMAT;
1829 goto out;
1830 }
1831 oprincipals = key->cert->principals;
1832 key->cert->principals = realloc(key->cert->principals,
1833 (key->cert->nprincipals + 1) *
1834 sizeof(*key->cert->principals));
1835 if (key->cert->principals == NULL) {
1836 free(principal);
1837 key->cert->principals = oprincipals;
1838 ret = SSH_ERR_ALLOC_FAIL;
1839 goto out;
1840 }
1841 key->cert->principals[key->cert->nprincipals++] = principal;
1842 }
1843
1844 sshbuf_reset(tmp);
1845
1846 if ((ret = sshbuf_put(key->cert->critical, critical, clen)) != 0 ||
1847 (ret = sshbuf_put(tmp, critical, clen)) != 0)
1848 goto out;
1849
1850 /* validate structure */
1851 while (sshbuf_len(tmp) != 0) {
1852 if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
1853 (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
1854 ret = SSH_ERR_INVALID_FORMAT;
1855 goto out;
1856 }
1857 }
1858 sshbuf_reset(tmp);
1859
1860 if ((ret = sshbuf_put(key->cert->extensions, exts, elen)) != 0 ||
1861 (ret = sshbuf_put(tmp, exts, elen)) != 0)
1862 goto out;
1863
1864 /* validate structure */
1865 while (sshbuf_len(tmp) != 0) {
1866 if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
1867 (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
1868 ret = SSH_ERR_INVALID_FORMAT;
1869 goto out;
1870 }
1871 }
1872 sshbuf_reset(tmp);
1873
1874 if (sshkey_from_blob_internal(sig_key, sklen,
1875 &key->cert->signature_key, 0) != 0) {
1876 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1877 goto out;
1878 }
1879 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1880 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1881 goto out;
1882 }
1883
1884 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1885 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1886 goto out;
1887 ret = 0;
1888
1889 out:
1890 sshbuf_free(tmp);
1891 free(principals);
1892 free(critical);
1893 free(exts);
1894 free(sig_key);
1895 free(sig);
1896 return ret;
1897 }
1898
1899 static int
1900 sshkey_from_blob_internal(const u_char *blob, size_t blen,
1901 struct sshkey **keyp, int allow_cert)
1902 {
1903 struct sshbuf *b = NULL;
1904 int type, nid = -1, ret = SSH_ERR_INTERNAL_ERROR;
1905 char *ktype = NULL, *curve = NULL;
1906 struct sshkey *key = NULL;
1907 size_t len;
1908 u_char *pk = NULL;
1909 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
1910 EC_POINT *q = NULL;
1911 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
1912
1913 #ifdef DEBUG_PK /* XXX */
1914 dump_base64(stderr, blob, blen);
1915 #endif
1916 *keyp = NULL;
1917 if ((b = sshbuf_from(blob, blen)) == NULL)
1918 return SSH_ERR_ALLOC_FAIL;
1919 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1920 ret = SSH_ERR_INVALID_FORMAT;
1921 goto out;
1922 }
1923
1924 type = sshkey_type_from_name(ktype);
1925 if (sshkey_type_plain(type) == KEY_ECDSA)
1926 nid = sshkey_ecdsa_nid_from_name(ktype);
1927 if (!allow_cert && sshkey_type_is_cert(type)) {
1928 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1929 goto out;
1930 }
1931 switch (type) {
1932 #ifdef WITH_OPENSSL
1933 case KEY_RSA_CERT:
1934 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1935 ret = SSH_ERR_INVALID_FORMAT;
1936 goto out;
1937 }
1938 /* FALLTHROUGH */
1939 case KEY_RSA:
1940 case KEY_RSA_CERT_V00:
1941 if ((key = sshkey_new(type)) == NULL) {
1942 ret = SSH_ERR_ALLOC_FAIL;
1943 goto out;
1944 }
1945 if (sshbuf_get_bignum2(b, key->rsa->e) == -1 ||
1946 sshbuf_get_bignum2(b, key->rsa->n) == -1) {
1947 ret = SSH_ERR_INVALID_FORMAT;
1948 goto out;
1949 }
1950 #ifdef DEBUG_PK
1951 RSA_print_fp(stderr, key->rsa, 8);
1952 #endif
1953 break;
1954 case KEY_DSA_CERT:
1955 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1956 ret = SSH_ERR_INVALID_FORMAT;
1957 goto out;
1958 }
1959 /* FALLTHROUGH */
1960 case KEY_DSA:
1961 case KEY_DSA_CERT_V00:
1962 if ((key = sshkey_new(type)) == NULL) {
1963 ret = SSH_ERR_ALLOC_FAIL;
1964 goto out;
1965 }
1966 if (sshbuf_get_bignum2(b, key->dsa->p) == -1 ||
1967 sshbuf_get_bignum2(b, key->dsa->q) == -1 ||
1968 sshbuf_get_bignum2(b, key->dsa->g) == -1 ||
1969 sshbuf_get_bignum2(b, key->dsa->pub_key) == -1) {
1970 ret = SSH_ERR_INVALID_FORMAT;
1971 goto out;
1972 }
1973 #ifdef DEBUG_PK
1974 DSA_print_fp(stderr, key->dsa, 8);
1975 #endif
1976 break;
1977 case KEY_ECDSA_CERT:
1978 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1979 ret = SSH_ERR_INVALID_FORMAT;
1980 goto out;
1981 }
1982 /* FALLTHROUGH */
1983 # ifdef OPENSSL_HAS_ECC
1984 case KEY_ECDSA:
1985 if ((key = sshkey_new(type)) == NULL) {
1986 ret = SSH_ERR_ALLOC_FAIL;
1987 goto out;
1988 }
1989 key->ecdsa_nid = nid;
1990 if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1991 ret = SSH_ERR_INVALID_FORMAT;
1992 goto out;
1993 }
1994 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1995 ret = SSH_ERR_EC_CURVE_MISMATCH;
1996 goto out;
1997 }
1998 if (key->ecdsa != NULL)
1999 EC_KEY_free(key->ecdsa);
2000 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2001 == NULL) {
2002 ret = SSH_ERR_EC_CURVE_INVALID;
2003 goto out;
2004 }
2005 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2006 ret = SSH_ERR_ALLOC_FAIL;
2007 goto out;
2008 }
2009 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2010 ret = SSH_ERR_INVALID_FORMAT;
2011 goto out;
2012 }
2013 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2014 q) != 0) {
2015 ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2016 goto out;
2017 }
2018 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2019 /* XXX assume it is a allocation error */
2020 ret = SSH_ERR_ALLOC_FAIL;
2021 goto out;
2022 }
2023 #ifdef DEBUG_PK
2024 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2025 #endif
2026 break;
2027 # endif /* OPENSSL_HAS_ECC */
2028 #endif /* WITH_OPENSSL */
2029 case KEY_ED25519_CERT:
2030 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2031 ret = SSH_ERR_INVALID_FORMAT;
2032 goto out;
2033 }
2034 /* FALLTHROUGH */
2035 case KEY_ED25519:
2036 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2037 goto out;
2038 if (len != ED25519_PK_SZ) {
2039 ret = SSH_ERR_INVALID_FORMAT;
2040 goto out;
2041 }
2042 if ((key = sshkey_new(type)) == NULL) {
2043 ret = SSH_ERR_ALLOC_FAIL;
2044 goto out;
2045 }
2046 key->ed25519_pk = pk;
2047 pk = NULL;
2048 break;
2049 case KEY_UNSPEC:
2050 if ((key = sshkey_new(type)) == NULL) {
2051 ret = SSH_ERR_ALLOC_FAIL;
2052 goto out;
2053 }
2054 break;
2055 default:
2056 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2057 goto out;
2058 }
2059
2060 /* Parse certificate potion */
2061 if (sshkey_is_cert(key) &&
2062 (ret = cert_parse(b, key, blob, blen)) != 0)
2063 goto out;
2064
2065 if (key != NULL && sshbuf_len(b) != 0) {
2066 ret = SSH_ERR_INVALID_FORMAT;
2067 goto out;
2068 }
2069 ret = 0;
2070 *keyp = key;
2071 key = NULL;
2072 out:
2073 sshbuf_free(b);
2074 sshkey_free(key);
2075 free(ktype);
2076 free(curve);
2077 free(pk);
2078 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2079 if (q != NULL)
2080 EC_POINT_free(q);
2081 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2082 return ret;
2083 }
2084
2085 int
2086 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2087 {
2088 return sshkey_from_blob_internal(blob, blen, keyp, 1);
2089 }
2090
2091 int
2092 sshkey_sign(const struct sshkey *key,
2093 u_char **sigp, size_t *lenp,
2094 const u_char *data, size_t datalen, u_int compat)
2095 {
2096 if (sigp != NULL)
2097 *sigp = NULL;
2098 if (lenp != NULL)
2099 *lenp = 0;
2100 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2101 return SSH_ERR_INVALID_ARGUMENT;
2102 switch (key->type) {
2103 #ifdef WITH_OPENSSL
2104 case KEY_DSA_CERT_V00:
2105 case KEY_DSA_CERT:
2106 case KEY_DSA:
2107 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2108 # ifdef OPENSSL_HAS_ECC
2109 case KEY_ECDSA_CERT:
2110 case KEY_ECDSA:
2111 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2112 # endif /* OPENSSL_HAS_ECC */
2113 case KEY_RSA_CERT_V00:
2114 case KEY_RSA_CERT:
2115 case KEY_RSA:
2116 return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2117 #endif /* WITH_OPENSSL */
2118 case KEY_ED25519:
2119 case KEY_ED25519_CERT:
2120 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2121 default:
2122 return SSH_ERR_KEY_TYPE_UNKNOWN;
2123 }
2124 }
2125
2126 /*
2127 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2128 */
2129 int
2130 sshkey_verify(const struct sshkey *key,
2131 const u_char *sig, size_t siglen,
2132 const u_char *data, size_t dlen, u_int compat)
2133 {
2134 if (siglen == 0)
2135 return -1;
2136
2137 if (dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2138 return SSH_ERR_INVALID_ARGUMENT;
2139 switch (key->type) {
2140 #ifdef WITH_OPENSSL
2141 case KEY_DSA_CERT_V00:
2142 case KEY_DSA_CERT:
2143 case KEY_DSA:
2144 return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2145 # ifdef OPENSSL_HAS_ECC
2146 case KEY_ECDSA_CERT:
2147 case KEY_ECDSA:
2148 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2149 # endif /* OPENSSL_HAS_ECC */
2150 case KEY_RSA_CERT_V00:
2151 case KEY_RSA_CERT:
2152 case KEY_RSA:
2153 return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2154 #endif /* WITH_OPENSSL */
2155 case KEY_ED25519:
2156 case KEY_ED25519_CERT:
2157 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2158 default:
2159 return SSH_ERR_KEY_TYPE_UNKNOWN;
2160 }
2161 }
2162
2163 /* Converts a private to a public key */
2164 int
2165 sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2166 {
2167 struct sshkey *pk;
2168 int ret = SSH_ERR_INTERNAL_ERROR;
2169
2170 if (dkp != NULL)
2171 *dkp = NULL;
2172
2173 if ((pk = calloc(1, sizeof(*pk))) == NULL)
2174 return SSH_ERR_ALLOC_FAIL;
2175 pk->type = k->type;
2176 pk->flags = k->flags;
2177 pk->ecdsa_nid = k->ecdsa_nid;
2178 pk->dsa = NULL;
2179 pk->ecdsa = NULL;
2180 pk->rsa = NULL;
2181 pk->ed25519_pk = NULL;
2182 pk->ed25519_sk = NULL;
2183
2184 switch (k->type) {
2185 #ifdef WITH_OPENSSL
2186 case KEY_RSA_CERT_V00:
2187 case KEY_RSA_CERT:
2188 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2189 goto fail;
2190 /* FALLTHROUGH */
2191 case KEY_RSA1:
2192 case KEY_RSA:
2193 if ((pk->rsa = RSA_new()) == NULL ||
2194 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2195 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2196 ret = SSH_ERR_ALLOC_FAIL;
2197 goto fail;
2198 }
2199 break;
2200 case KEY_DSA_CERT_V00:
2201 case KEY_DSA_CERT:
2202 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2203 goto fail;
2204 /* FALLTHROUGH */
2205 case KEY_DSA:
2206 if ((pk->dsa = DSA_new()) == NULL ||
2207 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2208 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2209 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2210 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2211 ret = SSH_ERR_ALLOC_FAIL;
2212 goto fail;
2213 }
2214 break;
2215 case KEY_ECDSA_CERT:
2216 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2217 goto fail;
2218 /* FALLTHROUGH */
2219 # ifdef OPENSSL_HAS_ECC
2220 case KEY_ECDSA:
2221 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2222 if (pk->ecdsa == NULL) {
2223 ret = SSH_ERR_ALLOC_FAIL;
2224 goto fail;
2225 }
2226 if (EC_KEY_set_public_key(pk->ecdsa,
2227 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2228 ret = SSH_ERR_LIBCRYPTO_ERROR;
2229 goto fail;
2230 }
2231 break;
2232 # endif /* OPENSSL_HAS_ECC */
2233 #endif /* WITH_OPENSSL */
2234 case KEY_ED25519_CERT:
2235 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2236 goto fail;
2237 /* FALLTHROUGH */
2238 case KEY_ED25519:
2239 if (k->ed25519_pk != NULL) {
2240 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2241 ret = SSH_ERR_ALLOC_FAIL;
2242 goto fail;
2243 }
2244 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2245 }
2246 break;
2247 default:
2248 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2249 fail:
2250 sshkey_free(pk);
2251 return ret;
2252 }
2253 *dkp = pk;
2254 return 0;
2255 }
2256
2257 /* Convert a plain key to their _CERT equivalent */
2258 int
2259 sshkey_to_certified(struct sshkey *k, int legacy)
2260 {
2261 int newtype;
2262
2263 switch (k->type) {
2264 #ifdef WITH_OPENSSL
2265 case KEY_RSA:
2266 newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
2267 break;
2268 case KEY_DSA:
2269 newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
2270 break;
2271 case KEY_ECDSA:
2272 if (legacy)
2273 return SSH_ERR_INVALID_ARGUMENT;
2274 newtype = KEY_ECDSA_CERT;
2275 break;
2276 #endif /* WITH_OPENSSL */
2277 case KEY_ED25519:
2278 if (legacy)
2279 return SSH_ERR_INVALID_ARGUMENT;
2280 newtype = KEY_ED25519_CERT;
2281 break;
2282 default:
2283 return SSH_ERR_INVALID_ARGUMENT;
2284 }
2285 if ((k->cert = cert_new()) == NULL)
2286 return SSH_ERR_ALLOC_FAIL;
2287 k->type = newtype;
2288 return 0;
2289 }
2290
2291 /* Convert a certificate to its raw key equivalent */
2292 int
2293 sshkey_drop_cert(struct sshkey *k)
2294 {
2295 if (!sshkey_type_is_cert(k->type))
2296 return SSH_ERR_KEY_TYPE_UNKNOWN;
2297 cert_free(k->cert);
2298 k->cert = NULL;
2299 k->type = sshkey_type_plain(k->type);
2300 return 0;
2301 }
2302
2303 /* Sign a certified key, (re-)generating the signed certblob. */
2304 int
2305 sshkey_certify(struct sshkey *k, struct sshkey *ca)
2306 {
2307 struct sshbuf *principals = NULL;
2308 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2309 size_t i, ca_len, sig_len;
2310 int ret = SSH_ERR_INTERNAL_ERROR;
2311 struct sshbuf *cert;
2312
2313 if (k == NULL || k->cert == NULL ||
2314 k->cert->certblob == NULL || ca == NULL)
2315 return SSH_ERR_INVALID_ARGUMENT;
2316 if (!sshkey_is_cert(k))
2317 return SSH_ERR_KEY_TYPE_UNKNOWN;
2318 if (!sshkey_type_is_valid_ca(ca->type))
2319 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2320
2321 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2322 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2323
2324 cert = k->cert->certblob; /* for readability */
2325 sshbuf_reset(cert);
2326 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2327 goto out;
2328
2329 /* -v01 certs put nonce first */
2330 arc4random_buf(&nonce, sizeof(nonce));
2331 if (!sshkey_cert_is_legacy(k)) {
2332 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2333 goto out;
2334 }
2335
2336 /* XXX this substantially duplicates to_blob(); refactor */
2337 switch (k->type) {
2338 #ifdef WITH_OPENSSL
2339 case KEY_DSA_CERT_V00:
2340 case KEY_DSA_CERT:
2341 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2342 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2343 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2344 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2345 goto out;
2346 break;
2347 # ifdef OPENSSL_HAS_ECC
2348 case KEY_ECDSA_CERT:
2349 if ((ret = sshbuf_put_cstring(cert,
2350 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2351 (ret = sshbuf_put_ec(cert,
2352 EC_KEY_get0_public_key(k->ecdsa),
2353 EC_KEY_get0_group(k->ecdsa))) != 0)
2354 goto out;
2355 break;
2356 # endif /* OPENSSL_HAS_ECC */
2357 case KEY_RSA_CERT_V00:
2358 case KEY_RSA_CERT:
2359 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2360 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2361 goto out;
2362 break;
2363 #endif /* WITH_OPENSSL */
2364 case KEY_ED25519_CERT:
2365 if ((ret = sshbuf_put_string(cert,
2366 k->ed25519_pk, ED25519_PK_SZ)) != 0)
2367 goto out;
2368 break;
2369 default:
2370 ret = SSH_ERR_INVALID_ARGUMENT;
2371 }
2372
2373 /* -v01 certs have a serial number next */
2374 if (!sshkey_cert_is_legacy(k)) {
2375 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
2376 goto out;
2377 }
2378
2379 if ((ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2380 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2381 goto out;
2382
2383 if ((principals = sshbuf_new()) == NULL) {
2384 ret = SSH_ERR_ALLOC_FAIL;
2385 goto out;
2386 }
2387 for (i = 0; i < k->cert->nprincipals; i++) {
2388 if ((ret = sshbuf_put_cstring(principals,
2389 k->cert->principals[i])) != 0)
2390 goto out;
2391 }
2392 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2393 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2394 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2395 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0)
2396 goto out;
2397
2398 /* -v01 certs have non-critical options here */
2399 if (!sshkey_cert_is_legacy(k)) {
2400 if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
2401 goto out;
2402 }
2403
2404 /* -v00 certs put the nonce at the end */
2405 if (sshkey_cert_is_legacy(k)) {
2406 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2407 goto out;
2408 }
2409
2410 if ((ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2411 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2412 goto out;
2413
2414 /* Sign the whole mess */
2415 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2416 sshbuf_len(cert), 0)) != 0)
2417 goto out;
2418
2419 /* Append signature and we are done */
2420 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2421 goto out;
2422 ret = 0;
2423 out:
2424 if (ret != 0)
2425 sshbuf_reset(cert);
2426 if (sig_blob != NULL)
2427 free(sig_blob);
2428 if (ca_blob != NULL)
2429 free(ca_blob);
2430 if (principals != NULL)
2431 sshbuf_free(principals);
2432 return ret;
2433 }
2434
2435 int
2436 sshkey_cert_check_authority(const struct sshkey *k,
2437 int want_host, int require_principal,
2438 const char *name, const char **reason)
2439 {
2440 u_int i, principal_matches;
2441 time_t now = time(NULL);
2442
2443 if (reason != NULL)
2444 *reason = NULL;
2445
2446 if (want_host) {
2447 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2448 *reason = "Certificate invalid: not a host certificate";
2449 return SSH_ERR_KEY_CERT_INVALID;
2450 }
2451 } else {
2452 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2453 *reason = "Certificate invalid: not a user certificate";
2454 return SSH_ERR_KEY_CERT_INVALID;
2455 }
2456 }
2457 if (now < 0) {
2458 /* yikes - system clock before epoch! */
2459 *reason = "Certificate invalid: not yet valid";
2460 return SSH_ERR_KEY_CERT_INVALID;
2461 }
2462 if ((u_int64_t)now < k->cert->valid_after) {
2463 *reason = "Certificate invalid: not yet valid";
2464 return SSH_ERR_KEY_CERT_INVALID;
2465 }
2466 if ((u_int64_t)now >= k->cert->valid_before) {
2467 *reason = "Certificate invalid: expired";
2468 return SSH_ERR_KEY_CERT_INVALID;
2469 }
2470 if (k->cert->nprincipals == 0) {
2471 if (require_principal) {
2472 *reason = "Certificate lacks principal list";
2473 return SSH_ERR_KEY_CERT_INVALID;
2474 }
2475 } else if (name != NULL) {
2476 principal_matches = 0;
2477 for (i = 0; i < k->cert->nprincipals; i++) {
2478 if (strcmp(name, k->cert->principals[i]) == 0) {
2479 principal_matches = 1;
2480 break;
2481 }
2482 }
2483 if (!principal_matches) {
2484 *reason = "Certificate invalid: name is not a listed "
2485 "principal";
2486 return SSH_ERR_KEY_CERT_INVALID;
2487 }
2488 }
2489 return 0;
2490 }
2491
2492 int
2493 sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2494 {
2495 int r = SSH_ERR_INTERNAL_ERROR;
2496
2497 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2498 goto out;
2499 switch (key->type) {
2500 #ifdef WITH_OPENSSL
2501 case KEY_RSA:
2502 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2503 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2504 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2505 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2506 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2507 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2508 goto out;
2509 break;
2510 case KEY_RSA_CERT_V00:
2511 case KEY_RSA_CERT:
2512 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2513 r = SSH_ERR_INVALID_ARGUMENT;
2514 goto out;
2515 }
2516 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2517 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2518 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2519 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2520 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2521 goto out;
2522 break;
2523 case KEY_DSA:
2524 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2525 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2526 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2527 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2528 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2529 goto out;
2530 break;
2531 case KEY_DSA_CERT_V00:
2532 case KEY_DSA_CERT:
2533 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2534 r = SSH_ERR_INVALID_ARGUMENT;
2535 goto out;
2536 }
2537 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2538 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2539 goto out;
2540 break;
2541 # ifdef OPENSSL_HAS_ECC
2542 case KEY_ECDSA:
2543 if ((r = sshbuf_put_cstring(b,
2544 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2545 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2546 (r = sshbuf_put_bignum2(b,
2547 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2548 goto out;
2549 break;
2550 case KEY_ECDSA_CERT:
2551 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2552 r = SSH_ERR_INVALID_ARGUMENT;
2553 goto out;
2554 }
2555 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2556 (r = sshbuf_put_bignum2(b,
2557 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2558 goto out;
2559 break;
2560 # endif /* OPENSSL_HAS_ECC */
2561 #endif /* WITH_OPENSSL */
2562 case KEY_ED25519:
2563 if ((r = sshbuf_put_string(b, key->ed25519_pk,
2564 ED25519_PK_SZ)) != 0 ||
2565 (r = sshbuf_put_string(b, key->ed25519_sk,
2566 ED25519_SK_SZ)) != 0)
2567 goto out;
2568 break;
2569 case KEY_ED25519_CERT:
2570 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2571 r = SSH_ERR_INVALID_ARGUMENT;
2572 goto out;
2573 }
2574 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2575 (r = sshbuf_put_string(b, key->ed25519_pk,
2576 ED25519_PK_SZ)) != 0 ||
2577 (r = sshbuf_put_string(b, key->ed25519_sk,
2578 ED25519_SK_SZ)) != 0)
2579 goto out;
2580 break;
2581 default:
2582 r = SSH_ERR_INVALID_ARGUMENT;
2583 goto out;
2584 }
2585 /* success */
2586 r = 0;
2587 out:
2588 return r;
2589 }
2590
2591 int
2592 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2593 {
2594 char *tname = NULL, *curve = NULL;
2595 struct sshkey *k = NULL;
2596 const u_char *cert;
2597 size_t len, pklen = 0, sklen = 0;
2598 int type, r = SSH_ERR_INTERNAL_ERROR;
2599 u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2600 #ifdef WITH_OPENSSL
2601 BIGNUM *exponent = NULL;
2602 #endif /* WITH_OPENSSL */
2603
2604 if (kp != NULL)
2605 *kp = NULL;
2606 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2607 goto out;
2608 type = sshkey_type_from_name(tname);
2609 switch (type) {
2610 #ifdef WITH_OPENSSL
2611 case KEY_DSA:
2612 if ((k = sshkey_new_private(type)) == NULL) {
2613 r = SSH_ERR_ALLOC_FAIL;
2614 goto out;
2615 }
2616 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2617 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2618 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2619 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2620 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2621 goto out;
2622 break;
2623 case KEY_DSA_CERT_V00:
2624 case KEY_DSA_CERT:
2625 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2626 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2627 (r = sshkey_add_private(k)) != 0 ||
2628 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2629 goto out;
2630 break;
2631 # ifdef OPENSSL_HAS_ECC
2632 case KEY_ECDSA:
2633 if ((k = sshkey_new_private(type)) == NULL) {
2634 r = SSH_ERR_ALLOC_FAIL;
2635 goto out;
2636 }
2637 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2638 r = SSH_ERR_INVALID_ARGUMENT;
2639 goto out;
2640 }
2641 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2642 goto out;
2643 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2644 r = SSH_ERR_EC_CURVE_MISMATCH;
2645 goto out;
2646 }
2647 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2648 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2649 r = SSH_ERR_LIBCRYPTO_ERROR;
2650 goto out;
2651 }
2652 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2653 (r = sshbuf_get_bignum2(buf, exponent)))
2654 goto out;
2655 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2656 r = SSH_ERR_LIBCRYPTO_ERROR;
2657 goto out;
2658 }
2659 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2660 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2661 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2662 goto out;
2663 break;
2664 case KEY_ECDSA_CERT:
2665 if ((exponent = BN_new()) == NULL) {
2666 r = SSH_ERR_LIBCRYPTO_ERROR;
2667 goto out;
2668 }
2669 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2670 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2671 (r = sshkey_add_private(k)) != 0 ||
2672 (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2673 goto out;
2674 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2675 r = SSH_ERR_LIBCRYPTO_ERROR;
2676 goto out;
2677 }
2678 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2679 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2680 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2681 goto out;
2682 break;
2683 # endif /* OPENSSL_HAS_ECC */
2684 case KEY_RSA:
2685 if ((k = sshkey_new_private(type)) == NULL) {
2686 r = SSH_ERR_ALLOC_FAIL;
2687 goto out;
2688 }
2689 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2690 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2691 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2692 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2693 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2694 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2695 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2696 goto out;
2697 break;
2698 case KEY_RSA_CERT_V00:
2699 case KEY_RSA_CERT:
2700 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2701 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2702 (r = sshkey_add_private(k)) != 0 ||
2703 (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2704 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2705 (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2706 (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2707 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2708 goto out;
2709 break;
2710 #endif /* WITH_OPENSSL */
2711 case KEY_ED25519:
2712 if ((k = sshkey_new_private(type)) == NULL) {
2713 r = SSH_ERR_ALLOC_FAIL;
2714 goto out;
2715 }
2716 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2717 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2718 goto out;
2719 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2720 r = SSH_ERR_INVALID_FORMAT;
2721 goto out;
2722 }
2723 k->ed25519_pk = ed25519_pk;
2724 k->ed25519_sk = ed25519_sk;
2725 ed25519_pk = ed25519_sk = NULL;
2726 break;
2727 case KEY_ED25519_CERT:
2728 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2729 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2730 (r = sshkey_add_private(k)) != 0 ||
2731 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2732 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2733 goto out;
2734 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2735 r = SSH_ERR_INVALID_FORMAT;
2736 goto out;
2737 }
2738 k->ed25519_pk = ed25519_pk;
2739 k->ed25519_sk = ed25519_sk;
2740 ed25519_pk = ed25519_sk = NULL;
2741 break;
2742 default:
2743 r = SSH_ERR_KEY_TYPE_UNKNOWN;
2744 goto out;
2745 }
2746 #ifdef WITH_OPENSSL
2747 /* enable blinding */
2748 switch (k->type) {
2749 case KEY_RSA:
2750 case KEY_RSA_CERT_V00:
2751 case KEY_RSA_CERT:
2752 case KEY_RSA1:
2753 if (RSA_blinding_on(k->rsa, NULL) != 1) {
2754 r = SSH_ERR_LIBCRYPTO_ERROR;
2755 goto out;
2756 }
2757 break;
2758 }
2759 #endif /* WITH_OPENSSL */
2760 /* success */
2761 r = 0;
2762 if (kp != NULL) {
2763 *kp = k;
2764 k = NULL;
2765 }
2766 out:
2767 free(tname);
2768 free(curve);
2769 #ifdef WITH_OPENSSL
2770 if (exponent != NULL)
2771 BN_clear_free(exponent);
2772 #endif /* WITH_OPENSSL */
2773 sshkey_free(k);
2774 if (ed25519_pk != NULL) {
2775 explicit_bzero(ed25519_pk, pklen);
2776 free(ed25519_pk);
2777 }
2778 if (ed25519_sk != NULL) {
2779 explicit_bzero(ed25519_sk, sklen);
2780 free(ed25519_sk);
2781 }
2782 return r;
2783 }
2784
2785 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2786 int
2787 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2788 {
2789 BN_CTX *bnctx;
2790 EC_POINT *nq = NULL;
2791 BIGNUM *order, *x, *y, *tmp;
2792 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2793
2794 if ((bnctx = BN_CTX_new()) == NULL)
2795 return SSH_ERR_ALLOC_FAIL;
2796 BN_CTX_start(bnctx);
2797
2798 /*
2799 * We shouldn't ever hit this case because bignum_get_ecpoint()
2800 * refuses to load GF2m points.
2801 */
2802 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2803 NID_X9_62_prime_field)
2804 goto out;
2805
2806 /* Q != infinity */
2807 if (EC_POINT_is_at_infinity(group, public))
2808 goto out;
2809
2810 if ((x = BN_CTX_get(bnctx)) == NULL ||
2811 (y = BN_CTX_get(bnctx)) == NULL ||
2812 (order = BN_CTX_get(bnctx)) == NULL ||
2813 (tmp = BN_CTX_get(bnctx)) == NULL) {
2814 ret = SSH_ERR_ALLOC_FAIL;
2815 goto out;
2816 }
2817
2818 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2819 if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2820 EC_POINT_get_affine_coordinates_GFp(group, public,
2821 x, y, bnctx) != 1) {
2822 ret = SSH_ERR_LIBCRYPTO_ERROR;
2823 goto out;
2824 }
2825 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2826 BN_num_bits(y) <= BN_num_bits(order) / 2)
2827 goto out;
2828
2829 /* nQ == infinity (n == order of subgroup) */
2830 if ((nq = EC_POINT_new(group)) == NULL) {
2831 ret = SSH_ERR_ALLOC_FAIL;
2832 goto out;
2833 }
2834 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2835 ret = SSH_ERR_LIBCRYPTO_ERROR;
2836 goto out;
2837 }
2838 if (EC_POINT_is_at_infinity(group, nq) != 1)
2839 goto out;
2840
2841 /* x < order - 1, y < order - 1 */
2842 if (!BN_sub(tmp, order, BN_value_one())) {
2843 ret = SSH_ERR_LIBCRYPTO_ERROR;
2844 goto out;
2845 }
2846 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2847 goto out;
2848 ret = 0;
2849 out:
2850 BN_CTX_free(bnctx);
2851 if (nq != NULL)
2852 EC_POINT_free(nq);
2853 return ret;
2854 }
2855
2856 int
2857 sshkey_ec_validate_private(const EC_KEY *key)
2858 {
2859 BN_CTX *bnctx;
2860 BIGNUM *order, *tmp;
2861 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2862
2863 if ((bnctx = BN_CTX_new()) == NULL)
2864 return SSH_ERR_ALLOC_FAIL;
2865 BN_CTX_start(bnctx);
2866
2867 if ((order = BN_CTX_get(bnctx)) == NULL ||
2868 (tmp = BN_CTX_get(bnctx)) == NULL) {
2869 ret = SSH_ERR_ALLOC_FAIL;
2870 goto out;
2871 }
2872
2873 /* log2(private) > log2(order)/2 */
2874 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2875 ret = SSH_ERR_LIBCRYPTO_ERROR;
2876 goto out;
2877 }
2878 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2879 BN_num_bits(order) / 2)
2880 goto out;
2881
2882 /* private < order - 1 */
2883 if (!BN_sub(tmp, order, BN_value_one())) {
2884 ret = SSH_ERR_LIBCRYPTO_ERROR;
2885 goto out;
2886 }
2887 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2888 goto out;
2889 ret = 0;
2890 out:
2891 BN_CTX_free(bnctx);
2892 return ret;
2893 }
2894
2895 void
2896 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2897 {
2898 BIGNUM *x, *y;
2899 BN_CTX *bnctx;
2900
2901 if (point == NULL) {
2902 fputs("point=(NULL)\n", stderr);
2903 return;
2904 }
2905 if ((bnctx = BN_CTX_new()) == NULL) {
2906 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2907 return;
2908 }
2909 BN_CTX_start(bnctx);
2910 if ((x = BN_CTX_get(bnctx)) == NULL ||
2911 (y = BN_CTX_get(bnctx)) == NULL) {
2912 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2913 return;
2914 }
2915 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2916 NID_X9_62_prime_field) {
2917 fprintf(stderr, "%s: group is not a prime field\n", __func__);
2918 return;
2919 }
2920 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2921 bnctx) != 1) {
2922 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2923 __func__);
2924 return;
2925 }
2926 fputs("x=", stderr);
2927 BN_print_fp(stderr, x);
2928 fputs("\ny=", stderr);
2929 BN_print_fp(stderr, y);
2930 fputs("\n", stderr);
2931 BN_CTX_free(bnctx);
2932 }
2933
2934 void
2935 sshkey_dump_ec_key(const EC_KEY *key)
2936 {
2937 const BIGNUM *exponent;
2938
2939 sshkey_dump_ec_point(EC_KEY_get0_group(key),
2940 EC_KEY_get0_public_key(key));
2941 fputs("exponent=", stderr);
2942 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2943 fputs("(NULL)", stderr);
2944 else
2945 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2946 fputs("\n", stderr);
2947 }
2948 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2949
2950 static int
2951 sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2952 const char *passphrase, const char *comment, const char *ciphername,
2953 int rounds)
2954 {
2955 u_char *cp, *b64 = NULL, *key = NULL, *pubkeyblob = NULL;
2956 u_char salt[SALT_LEN];
2957 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2958 u_int check;
2959 int r = SSH_ERR_INTERNAL_ERROR;
2960 struct sshcipher_ctx ciphercontext;
2961 const struct sshcipher *cipher;
2962 const char *kdfname = KDFNAME;
2963 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2964
2965 memset(&ciphercontext, 0, sizeof(ciphercontext));
2966
2967 if (rounds <= 0)
2968 rounds = DEFAULT_ROUNDS;
2969 if (passphrase == NULL || !strlen(passphrase)) {
2970 ciphername = "none";
2971 kdfname = "none";
2972 } else if (ciphername == NULL)
2973 ciphername = DEFAULT_CIPHERNAME;
2974 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2975 r = SSH_ERR_INVALID_ARGUMENT;
2976 goto out;
2977 }
2978 if ((cipher = cipher_by_name(ciphername)) == NULL) {
2979 r = SSH_ERR_INTERNAL_ERROR;
2980 goto out;
2981 }
2982
2983 if ((kdf = sshbuf_new()) == NULL ||
2984 (encoded = sshbuf_new()) == NULL ||
2985 (encrypted = sshbuf_new()) == NULL) {
2986 r = SSH_ERR_ALLOC_FAIL;
2987 goto out;
2988 }
2989 blocksize = cipher_blocksize(cipher);
2990 keylen = cipher_keylen(cipher);
2991 ivlen = cipher_ivlen(cipher);
2992 authlen = cipher_authlen(cipher);
2993 if ((key = calloc(1, keylen + ivlen)) == NULL) {
2994 r = SSH_ERR_ALLOC_FAIL;
2995 goto out;
2996 }
2997 if (strcmp(kdfname, "bcrypt") == 0) {
2998 arc4random_buf(salt, SALT_LEN);
2999 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3000 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3001 r = SSH_ERR_INVALID_ARGUMENT;
3002 goto out;
3003 }
3004 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3005 (r = sshbuf_put_u32(kdf, rounds)) != 0)
3006 goto out;
3007 } else if (strcmp(kdfname, "none") != 0) {
3008 /* Unsupported KDF type */
3009 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3010 goto out;
3011 }
3012 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3013 key + keylen, ivlen, 1)) != 0)
3014 goto out;
3015
3016 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3017 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3018 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3019 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3020 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3021 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3022 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3023 goto out;
3024
3025 /* set up the buffer that will be encrypted */
3026
3027 /* Random check bytes */
3028 check = arc4random();
3029 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3030 (r = sshbuf_put_u32(encrypted, check)) != 0)
3031 goto out;
3032
3033 /* append private key and comment*/
3034 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3035 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3036 goto out;
3037
3038 /* padding */
3039 i = 0;
3040 while (sshbuf_len(encrypted) % blocksize) {
3041 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3042 goto out;
3043 }
3044
3045 /* length in destination buffer */
3046 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3047 goto out;
3048
3049 /* encrypt */
3050 if ((r = sshbuf_reserve(encoded,
3051 sshbuf_len(encrypted) + authlen, &cp)) != 0)
3052 goto out;
3053 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3054 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3055 goto out;
3056
3057 /* uuencode */
3058 if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3059 r = SSH_ERR_ALLOC_FAIL;
3060 goto out;
3061 }
3062
3063 sshbuf_reset(blob);
3064 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3065 goto out;
3066 for (i = 0; i < strlen(b64); i++) {
3067 if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3068 goto out;
3069 /* insert line breaks */
3070 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3071 goto out;
3072 }
3073 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3074 goto out;
3075 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3076 goto out;
3077
3078 /* success */
3079 r = 0;
3080
3081 out:
3082 sshbuf_free(kdf);
3083 sshbuf_free(encoded);
3084 sshbuf_free(encrypted);
3085 cipher_cleanup(&ciphercontext);
3086 explicit_bzero(salt, sizeof(salt));
3087 if (key != NULL) {
3088 explicit_bzero(key, keylen + ivlen);
3089 free(key);
3090 }
3091 if (pubkeyblob != NULL) {
3092 explicit_bzero(pubkeyblob, pubkeylen);
3093 free(pubkeyblob);
3094 }
3095 if (b64 != NULL) {
3096 explicit_bzero(b64, strlen(b64));
3097 free(b64);
3098 }
3099 return r;
3100 }
3101
3102 static int
3103 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3104 struct sshkey **keyp, char **commentp)
3105 {
3106 char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3107 const struct sshcipher *cipher = NULL;
3108 const u_char *cp;
3109 int r = SSH_ERR_INTERNAL_ERROR;
3110 size_t encoded_len;
3111 size_t i, keylen = 0, ivlen = 0, slen = 0;
3112 struct sshbuf *encoded = NULL, *decoded = NULL;
3113 struct sshbuf *kdf = NULL, *decrypted = NULL;
3114 struct sshcipher_ctx ciphercontext;
3115 struct sshkey *k = NULL;
3116 u_char *key = NULL, *salt = NULL, *dp, pad, last;
3117 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3118
3119 memset(&ciphercontext, 0, sizeof(ciphercontext));
3120 if (keyp != NULL)
3121 *keyp = NULL;
3122 if (commentp != NULL)
3123 *commentp = NULL;
3124
3125 if ((encoded = sshbuf_new()) == NULL ||
3126 (decoded = sshbuf_new()) == NULL ||
3127 (decrypted = sshbuf_new()) == NULL) {
3128 r = SSH_ERR_ALLOC_FAIL;
3129 goto out;
3130 }
3131
3132 /* check preamble */
3133 cp = sshbuf_ptr(blob);
3134 encoded_len = sshbuf_len(blob);
3135 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3136 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3137 r = SSH_ERR_INVALID_FORMAT;
3138 goto out;
3139 }
3140 cp += MARK_BEGIN_LEN;
3141 encoded_len -= MARK_BEGIN_LEN;
3142
3143 /* Look for end marker, removing whitespace as we go */
3144 while (encoded_len > 0) {
3145 if (*cp != '\n' && *cp != '\r') {
3146 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3147 goto out;
3148 }
3149 last = *cp;
3150 encoded_len--;
3151 cp++;
3152 if (last == '\n') {
3153 if (encoded_len >= MARK_END_LEN &&
3154 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3155 /* \0 terminate */
3156 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3157 goto out;
3158 break;
3159 }
3160 }
3161 }
3162 if (encoded_len == 0) {
3163 r = SSH_ERR_INVALID_FORMAT;
3164 goto out;
3165 }
3166
3167 /* decode base64 */
3168 if ((r = sshbuf_b64tod(decoded, sshbuf_ptr(encoded))) != 0)
3169 goto out;
3170
3171 /* check magic */
3172 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3173 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3174 r = SSH_ERR_INVALID_FORMAT;
3175 goto out;
3176 }
3177 /* parse public portion of key */
3178 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3179 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3180 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3181 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3182 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3183 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3184 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3185 goto out;
3186
3187 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3188 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3189 goto out;
3190 }
3191 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3192 strcmp(ciphername, "none") != 0) {
3193 /* passphrase required */
3194 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3195 goto out;
3196 }
3197 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3198 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3199 goto out;
3200 }
3201 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3202 r = SSH_ERR_INVALID_FORMAT;
3203 goto out;
3204 }
3205 if (nkeys != 1) {
3206 /* XXX only one key supported */
3207 r = SSH_ERR_INVALID_FORMAT;
3208 goto out;
3209 }
3210
3211 /* check size of encrypted key blob */
3212 blocksize = cipher_blocksize(cipher);
3213 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3214 r = SSH_ERR_INVALID_FORMAT;
3215 goto out;
3216 }
3217
3218 /* setup key */
3219 keylen = cipher_keylen(cipher);
3220 ivlen = cipher_ivlen(cipher);
3221 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3222 r = SSH_ERR_ALLOC_FAIL;
3223 goto out;
3224 }
3225 if (strcmp(kdfname, "bcrypt") == 0) {
3226 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3227 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3228 goto out;
3229 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3230 key, keylen + ivlen, rounds) < 0) {
3231 r = SSH_ERR_INVALID_FORMAT;
3232 goto out;
3233 }
3234 }
3235
3236 /* decrypt private portion of key */
3237 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3238 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3239 key + keylen, ivlen, 0)) != 0)
3240 goto out;
3241 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3242 sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 0) {
3243 /* an integrity error here indicates an incorrect passphrase */
3244 if (r == SSH_ERR_MAC_INVALID)
3245 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3246 goto out;
3247 }
3248 if ((r = sshbuf_consume(decoded, encrypted_len)) != 0)
3249 goto out;
3250 /* there should be no trailing data */
3251 if (sshbuf_len(decoded) != 0) {
3252 r = SSH_ERR_INVALID_FORMAT;
3253 goto out;
3254 }
3255
3256 /* check check bytes */
3257 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3258 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3259 goto out;
3260 if (check1 != check2) {
3261 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3262 goto out;
3263 }
3264
3265 /* Load the private key and comment */
3266 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3267 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3268 goto out;
3269
3270 /* Check deterministic padding */
3271 i = 0;
3272 while (sshbuf_len(decrypted)) {
3273 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3274 goto out;
3275 if (pad != (++i & 0xff)) {
3276 r = SSH_ERR_INVALID_FORMAT;
3277 goto out;
3278 }
3279 }
3280
3281 /* XXX decode pubkey and check against private */
3282
3283 /* success */
3284 r = 0;
3285 if (keyp != NULL) {
3286 *keyp = k;
3287 k = NULL;
3288 }
3289 if (commentp != NULL) {
3290 *commentp = comment;
3291 comment = NULL;
3292 }
3293 out:
3294 pad = 0;
3295 cipher_cleanup(&ciphercontext);
3296 free(ciphername);
3297 free(kdfname);
3298 free(comment);
3299 if (salt != NULL) {
3300 explicit_bzero(salt, slen);
3301 free(salt);
3302 }
3303 if (key != NULL) {
3304 explicit_bzero(key, keylen + ivlen);
3305 free(key);
3306 }
3307 sshbuf_free(encoded);
3308 sshbuf_free(decoded);
3309 sshbuf_free(kdf);
3310 sshbuf_free(decrypted);
3311 sshkey_free(k);
3312 return r;
3313 }
3314
3315 #if WITH_SSH1
3316 /*
3317 * Serialises the authentication (private) key to a blob, encrypting it with
3318 * passphrase. The identification of the blob (lowest 64 bits of n) will
3319 * precede the key to provide identification of the key without needing a
3320 * passphrase.
3321 */
3322 static int
3323 sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3324 const char *passphrase, const char *comment)
3325 {
3326 struct sshbuf *buffer = NULL, *encrypted = NULL;
3327 u_char buf[8];
3328 int r, cipher_num;
3329 struct sshcipher_ctx ciphercontext;
3330 const struct sshcipher *cipher;
3331 u_char *cp;
3332
3333 /*
3334 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3335 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3336 */
3337 cipher_num = (strcmp(passphrase, "") == 0) ?
3338 SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3339 if ((cipher = cipher_by_number(cipher_num)) == NULL)
3340 return SSH_ERR_INTERNAL_ERROR;
3341
3342 /* This buffer is used to build the secret part of the private key. */
3343 if ((buffer = sshbuf_new()) == NULL)
3344 return SSH_ERR_ALLOC_FAIL;
3345
3346 /* Put checkbytes for checking passphrase validity. */
3347 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3348 goto out;
3349 arc4random_buf(cp, 2);
3350 memcpy(cp + 2, cp, 2);
3351
3352 /*
3353 * Store the private key (n and e will not be stored because they
3354 * will be stored in plain text, and storing them also in encrypted
3355 * format would just give known plaintext).
3356 * Note: q and p are stored in reverse order to SSL.
3357 */
3358 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3359 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3360 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3361 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3362 goto out;
3363
3364 /* Pad the part to be encrypted to a size that is a multiple of 8. */
3365 explicit_bzero(buf, 8);
3366 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3367 goto out;
3368
3369 /* This buffer will be used to contain the data in the file. */
3370 if ((encrypted = sshbuf_new()) == NULL) {
3371 r = SSH_ERR_ALLOC_FAIL;
3372 goto out;
3373 }
3374
3375 /* First store keyfile id string. */
3376 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3377 sizeof(LEGACY_BEGIN))) != 0)
3378 goto out;
3379
3380 /* Store cipher type and "reserved" field. */
3381 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3382 (r = sshbuf_put_u32(encrypted, 0)) != 0)
3383 goto out;
3384
3385 /* Store public key. This will be in plain text. */
3386 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3387 (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3388 (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3389 (r = sshbuf_put_cstring(encrypted, comment) != 0))
3390 goto out;
3391
3392 /* Allocate space for the private part of the key in the buffer. */
3393 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3394 goto out;
3395
3396 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3397 CIPHER_ENCRYPT)) != 0)
3398 goto out;
3399 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3400 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3401 goto out;
3402 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3403 goto out;
3404
3405 r = sshbuf_putb(blob, encrypted);
3406
3407 out:
3408 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3409 explicit_bzero(buf, sizeof(buf));
3410 if (buffer != NULL)
3411 sshbuf_free(buffer);
3412 if (encrypted != NULL)
3413 sshbuf_free(encrypted);
3414
3415 return r;
3416 }
3417 #endif /* WITH_SSH1 */
3418
3419 #ifdef WITH_OPENSSL
3420 /* convert SSH v2 key in OpenSSL PEM format */
3421 static int
3422 sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3423 const char *_passphrase, const char *comment)
3424 {
3425 int success, r;
3426 int blen, len = strlen(_passphrase);
3427 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3428 #if (OPENSSL_VERSION_NUMBER < 0x00907000L)
3429 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
3430 #else
3431 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3432 #endif
3433 const u_char *bptr;
3434 BIO *bio = NULL;
3435
3436 if (len > 0 && len <= 4)
3437 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3438 if ((bio = BIO_new(BIO_s_mem())) == NULL)
3439 return SSH_ERR_ALLOC_FAIL;
3440
3441 switch (key->type) {
3442 case KEY_DSA:
3443 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3444 cipher, passphrase, len, NULL, NULL);
3445 break;
3446 #ifdef OPENSSL_HAS_ECC
3447 case KEY_ECDSA:
3448 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3449 cipher, passphrase, len, NULL, NULL);
3450 break;
3451 #endif
3452 case KEY_RSA:
3453 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3454 cipher, passphrase, len, NULL, NULL);
3455 break;
3456 default:
3457 success = 0;
3458 break;
3459 }
3460 if (success == 0) {
3461 r = SSH_ERR_LIBCRYPTO_ERROR;
3462 goto out;
3463 }
3464 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3465 r = SSH_ERR_INTERNAL_ERROR;
3466 goto out;
3467 }
3468 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3469 goto out;
3470 r = 0;
3471 out:
3472 BIO_free(bio);
3473 return r;
3474 }
3475 #endif /* WITH_OPENSSL */
3476
3477 /* Serialise "key" to buffer "blob" */
3478 int
3479 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3480 const char *passphrase, const char *comment,
3481 int force_new_format, const char *new_format_cipher, int new_format_rounds)
3482 {
3483 switch (key->type) {
3484 #ifdef WITH_OPENSSL
3485 case KEY_RSA1:
3486 return sshkey_private_rsa1_to_blob(key, blob,
3487 passphrase, comment);
3488 case KEY_DSA:
3489 case KEY_ECDSA:
3490 case KEY_RSA:
3491 if (force_new_format) {
3492 return sshkey_private_to_blob2(key, blob, passphrase,
3493 comment, new_format_cipher, new_format_rounds);
3494 }
3495 return sshkey_private_pem_to_blob(key, blob,
3496 passphrase, comment);
3497 #endif /* WITH_OPENSSL */
3498 case KEY_ED25519:
3499 return sshkey_private_to_blob2(key, blob, passphrase,
3500 comment, new_format_cipher, new_format_rounds);
3501 default:
3502 return SSH_ERR_KEY_TYPE_UNKNOWN;
3503 }
3504 }
3505
3506 #ifdef WITH_SSH1
3507 /*
3508 * Parse the public, unencrypted portion of a RSA1 key.
3509 */
3510 int
3511 sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3512 struct sshkey **keyp, char **commentp)
3513 {
3514 int r;
3515 struct sshkey *pub = NULL;
3516 struct sshbuf *copy = NULL;
3517
3518 if (keyp != NULL)
3519 *keyp = NULL;
3520 if (commentp != NULL)
3521 *commentp = NULL;
3522
3523 /* Check that it is at least big enough to contain the ID string. */
3524 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3525 return SSH_ERR_INVALID_FORMAT;
3526
3527 /*
3528 * Make sure it begins with the id string. Consume the id string
3529 * from the buffer.
3530 */
3531 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3532 return SSH_ERR_INVALID_FORMAT;
3533 /* Make a working copy of the keyblob and skip past the magic */
3534 if ((copy = sshbuf_fromb(blob)) == NULL)
3535 return SSH_ERR_ALLOC_FAIL;
3536 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3537 goto out;
3538
3539 /* Skip cipher type, reserved data and key bits. */
3540 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3541 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3542 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3543 goto out;
3544
3545 /* Read the public key from the buffer. */
3546 if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3547 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3548 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3549 goto out;
3550
3551 /* Finally, the comment */
3552 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3553 goto out;
3554
3555 /* The encrypted private part is not parsed by this function. */
3556
3557 r = 0;
3558 if (keyp != NULL)
3559 *keyp = pub;
3560 else
3561 sshkey_free(pub);
3562 pub = NULL;
3563
3564 out:
3565 if (copy != NULL)
3566 sshbuf_free(copy);
3567 if (pub != NULL)
3568 sshkey_free(pub);
3569 return r;
3570 }
3571
3572 static int
3573 sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3574 struct sshkey **keyp, char **commentp)
3575 {
3576 int r;
3577 u_int16_t check1, check2;
3578 u_int8_t cipher_type;
3579 struct sshbuf *decrypted = NULL, *copy = NULL;
3580 u_char *cp;
3581 char *comment = NULL;
3582 struct sshcipher_ctx ciphercontext;
3583 const struct sshcipher *cipher;
3584 struct sshkey *prv = NULL;
3585
3586 *keyp = NULL;
3587 if (commentp != NULL)
3588 *commentp = NULL;
3589
3590 /* Check that it is at least big enough to contain the ID string. */
3591 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3592 return SSH_ERR_INVALID_FORMAT;
3593
3594 /*
3595 * Make sure it begins with the id string. Consume the id string
3596 * from the buffer.
3597 */
3598 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3599 return SSH_ERR_INVALID_FORMAT;
3600
3601 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3602 r = SSH_ERR_ALLOC_FAIL;
3603 goto out;
3604 }
3605 if ((copy = sshbuf_fromb(blob)) == NULL ||
3606 (decrypted = sshbuf_new()) == NULL) {
3607 r = SSH_ERR_ALLOC_FAIL;
3608 goto out;
3609 }
3610 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3611 goto out;
3612
3613 /* Read cipher type. */
3614 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3615 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3616 goto out;
3617
3618 /* Read the public key and comment from the buffer. */
3619 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3620 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3621 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3622 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3623 goto out;
3624
3625 /* Check that it is a supported cipher. */
3626 cipher = cipher_by_number(cipher_type);
3627 if (cipher == NULL) {
3628 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3629 goto out;
3630 }
3631 /* Initialize space for decrypted data. */
3632 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3633 goto out;
3634
3635 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3636 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3637 CIPHER_DECRYPT)) != 0)
3638 goto out;
3639 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3640 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3641 cipher_cleanup(&ciphercontext);
3642 goto out;
3643 }
3644 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3645 goto out;
3646
3647 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3648 (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3649 goto out;
3650 if (check1 != check2) {
3651 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3652 goto out;
3653 }
3654
3655 /* Read the rest of the private key. */
3656 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3657 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3658 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3659 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3660 goto out;
3661
3662 /* calculate p-1 and q-1 */
3663 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3664 goto out;
3665
3666 /* enable blinding */
3667 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3668 r = SSH_ERR_LIBCRYPTO_ERROR;
3669 goto out;
3670 }
3671 r = 0;
3672 *keyp = prv;
3673 prv = NULL;
3674 if (commentp != NULL) {
3675 *commentp = comment;
3676 comment = NULL;
3677 }
3678 out:
3679 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3680 if (comment != NULL)
3681 free(comment);
3682 if (prv != NULL)
3683 sshkey_free(prv);
3684 if (copy != NULL)
3685 sshbuf_free(copy);
3686 if (decrypted != NULL)
3687 sshbuf_free(decrypted);
3688 return r;
3689 }
3690 #endif /* WITH_SSH1 */
3691
3692 #ifdef WITH_OPENSSL
3693 /* XXX make private once ssh-keysign.c fixed */
3694 int
3695 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3696 const char *passphrase, struct sshkey **keyp, char **commentp)
3697 {
3698 EVP_PKEY *pk = NULL;
3699 struct sshkey *prv = NULL;
3700 char *name = "<no key>";
3701 BIO *bio = NULL;
3702 int r;
3703
3704 *keyp = NULL;
3705 if (commentp != NULL)
3706 *commentp = NULL;
3707
3708 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3709 return SSH_ERR_ALLOC_FAIL;
3710 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3711 (int)sshbuf_len(blob)) {
3712 r = SSH_ERR_ALLOC_FAIL;
3713 goto out;
3714 }
3715
3716 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3717 (char *)passphrase)) == NULL) {
3718 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3719 goto out;
3720 }
3721 if (pk->type == EVP_PKEY_RSA &&
3722 (type == KEY_UNSPEC || type == KEY_RSA)) {
3723 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3724 r = SSH_ERR_ALLOC_FAIL;
3725 goto out;
3726 }
3727 prv->rsa = EVP_PKEY_get1_RSA(pk);
3728 prv->type = KEY_RSA;
3729 name = "rsa w/o comment";
3730 #ifdef DEBUG_PK
3731 RSA_print_fp(stderr, prv->rsa, 8);
3732 #endif
3733 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3734 r = SSH_ERR_LIBCRYPTO_ERROR;
3735 goto out;
3736 }
3737 } else if (pk->type == EVP_PKEY_DSA &&
3738 (type == KEY_UNSPEC || type == KEY_DSA)) {
3739 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3740 r = SSH_ERR_ALLOC_FAIL;
3741 goto out;
3742 }
3743 prv->dsa = EVP_PKEY_get1_DSA(pk);
3744 prv->type = KEY_DSA;
3745 name = "dsa w/o comment";
3746 #ifdef DEBUG_PK
3747 DSA_print_fp(stderr, prv->dsa, 8);
3748 #endif
3749 #ifdef OPENSSL_HAS_ECC
3750 } else if (pk->type == EVP_PKEY_EC &&
3751 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3752 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3753 r = SSH_ERR_ALLOC_FAIL;
3754 goto out;
3755 }
3756 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3757 prv->type = KEY_ECDSA;
3758 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3759 if (prv->ecdsa_nid == -1 ||
3760 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3761 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3762 EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3763 sshkey_ec_validate_private(prv->ecdsa) != 0) {
3764 r = SSH_ERR_INVALID_FORMAT;
3765 goto out;
3766 }
3767 name = "ecdsa w/o comment";
3768 # ifdef DEBUG_PK
3769 if (prv != NULL && prv->ecdsa != NULL)
3770 sshkey_dump_ec_key(prv->ecdsa);
3771 # endif
3772 #endif /* OPENSSL_HAS_ECC */
3773 } else {
3774 r = SSH_ERR_INVALID_FORMAT;
3775 goto out;
3776 }
3777 if (commentp != NULL &&
3778 (*commentp = strdup(name)) == NULL) {
3779 r = SSH_ERR_ALLOC_FAIL;
3780 goto out;
3781 }
3782 r = 0;
3783 *keyp = prv;
3784 prv = NULL;
3785 out:
3786 BIO_free(bio);
3787 if (pk != NULL)
3788 EVP_PKEY_free(pk);
3789 if (prv != NULL)
3790 sshkey_free(prv);
3791 return r;
3792 }
3793 #endif /* WITH_OPENSSL */
3794
3795 int
3796 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3797 const char *passphrase, struct sshkey **keyp, char **commentp)
3798 {
3799 int r;
3800
3801 *keyp = NULL;
3802 if (commentp != NULL)
3803 *commentp = NULL;
3804
3805 switch (type) {
3806 #ifdef WITH_OPENSSL
3807 case KEY_RSA1:
3808 return sshkey_parse_private_rsa1(blob, passphrase,
3809 keyp, commentp);
3810 case KEY_DSA:
3811 case KEY_ECDSA:
3812 case KEY_RSA:
3813 return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3814 keyp, commentp);
3815 #endif /* WITH_OPENSSL */
3816 case KEY_ED25519:
3817 return sshkey_parse_private2(blob, type, passphrase,
3818 keyp, commentp);
3819 case KEY_UNSPEC:
3820 if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3821 commentp)) == 0)
3822 return 0;
3823 #ifdef WITH_OPENSSL
3824 return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3825 keyp, commentp);
3826 #else
3827 return SSH_ERR_INVALID_FORMAT;
3828 #endif /* WITH_OPENSSL */
3829 default:
3830 return SSH_ERR_KEY_TYPE_UNKNOWN;
3831 }
3832 }
3833
3834 int
3835 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3836 const char *filename, struct sshkey **keyp, char **commentp)
3837 {
3838 int r;
3839
3840 if (keyp != NULL)
3841 *keyp = NULL;
3842 if (commentp != NULL)
3843 *commentp = NULL;
3844
3845 #ifdef WITH_SSH1
3846 /* it's a SSH v1 key if the public key part is readable */
3847 if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3848 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3849 passphrase, keyp, commentp);
3850 }
3851 #endif /* WITH_SSH1 */
3852 if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3853 passphrase, keyp, commentp)) == 0)
3854 return 0;
3855 return r;
3856 }
DragonFly BSD