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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
70static int sshkey_from_blob_internal(const u_char *blob, size_t blen,
71 struct sshkey **keyp, int allow_cert);
72
73/* Supported key types */
74struct keytype {
75 const char *name;
76 const char *shortname;
77 int type;
78 int nid;
79 int cert;
80};
81static 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", KEY_NULL, 0, 0 },
114 { NULL, NULL, -1, -1, 0 }
115};
116
117const char *
118sshkey_type(const struct sshkey *k)
119{
120 const struct keytype *kt;
121
122 for (kt = keytypes; kt->type != -1; kt++) {
123 if (kt->type == k->type)
124 return kt->shortname;
125 }
126 return "unknown";
127}
128
129static const char *
130sshkey_ssh_name_from_type_nid(int type, int nid)
131{
132 const struct keytype *kt;
133
134 for (kt = keytypes; kt->type != -1; kt++) {
135 if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
136 return kt->name;
137 }
138 return "ssh-unknown";
139}
140
141int
142sshkey_type_is_cert(int type)
143{
144 const struct keytype *kt;
145
146 for (kt = keytypes; kt->type != -1; kt++) {
147 if (kt->type == type)
148 return kt->cert;
149 }
150 return 0;
151}
152
153const char *
154sshkey_ssh_name(const struct sshkey *k)
155{
156 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
157}
158
159const char *
160sshkey_ssh_name_plain(const struct sshkey *k)
161{
162 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
163 k->ecdsa_nid);
164}
165
166int
167sshkey_type_from_name(const char *name)
168{
169 const struct keytype *kt;
170
171 for (kt = keytypes; kt->type != -1; kt++) {
172 /* Only allow shortname matches for plain key types */
173 if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
174 (!kt->cert && strcasecmp(kt->shortname, name) == 0))
175 return kt->type;
176 }
177 return KEY_UNSPEC;
178}
179
180int
181sshkey_ecdsa_nid_from_name(const char *name)
182{
183 const struct keytype *kt;
184
185 for (kt = keytypes; kt->type != -1; kt++) {
186 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
187 continue;
188 if (kt->name != NULL && strcmp(name, kt->name) == 0)
189 return kt->nid;
190 }
191 return -1;
192}
193
194char *
195key_alg_list(int certs_only, int plain_only)
196{
197 char *tmp, *ret = NULL;
198 size_t nlen, rlen = 0;
199 const struct keytype *kt;
200
201 for (kt = keytypes; kt->type != -1; kt++) {
202 if (kt->name == NULL || kt->type == KEY_NULL)
203 continue;
204 if ((certs_only && !kt->cert) || (plain_only && kt->cert))
205 continue;
206 if (ret != NULL)
207 ret[rlen++] = '\n';
208 nlen = strlen(kt->name);
209 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
210 free(ret);
211 return NULL;
212 }
213 ret = tmp;
214 memcpy(ret + rlen, kt->name, nlen + 1);
215 rlen += nlen;
216 }
217 return ret;
218}
219
220int
221sshkey_names_valid2(const char *names)
222{
223 char *s, *cp, *p;
224
225 if (names == NULL || strcmp(names, "") == 0)
226 return 0;
227 if ((s = cp = strdup(names)) == NULL)
228 return 0;
229 for ((p = strsep(&cp, ",")); p && *p != '\0';
230 (p = strsep(&cp, ","))) {
231 switch (sshkey_type_from_name(p)) {
232 case KEY_RSA1:
233 case KEY_UNSPEC:
234 free(s);
235 return 0;
236 }
237 }
238 free(s);
239 return 1;
240}
241
242u_int
243sshkey_size(const struct sshkey *k)
244{
245 switch (k->type) {
246#ifdef WITH_OPENSSL
247 case KEY_RSA1:
248 case KEY_RSA:
249 case KEY_RSA_CERT_V00:
250 case KEY_RSA_CERT:
251 return BN_num_bits(k->rsa->n);
252 case KEY_DSA:
253 case KEY_DSA_CERT_V00:
254 case KEY_DSA_CERT:
255 return BN_num_bits(k->dsa->p);
256 case KEY_ECDSA:
257 case KEY_ECDSA_CERT:
258 return sshkey_curve_nid_to_bits(k->ecdsa_nid);
259#endif /* WITH_OPENSSL */
260 case KEY_ED25519:
261 case KEY_ED25519_CERT:
262 return 256; /* XXX */
263 }
264 return 0;
265}
266
267int
268sshkey_cert_is_legacy(const struct sshkey *k)
269{
270 switch (k->type) {
271 case KEY_DSA_CERT_V00:
272 case KEY_RSA_CERT_V00:
273 return 1;
274 default:
275 return 0;
276 }
277}
278
279static int
280sshkey_type_is_valid_ca(int type)
281{
282 switch (type) {
283 case KEY_RSA:
284 case KEY_DSA:
285 case KEY_ECDSA:
286 case KEY_ED25519:
287 return 1;
288 default:
289 return 0;
290 }
291}
292
293int
294sshkey_is_cert(const struct sshkey *k)
295{
296 if (k == NULL)
297 return 0;
298 return sshkey_type_is_cert(k->type);
299}
300
301/* Return the cert-less equivalent to a certified key type */
302int
303sshkey_type_plain(int type)
304{
305 switch (type) {
306 case KEY_RSA_CERT_V00:
307 case KEY_RSA_CERT:
308 return KEY_RSA;
309 case KEY_DSA_CERT_V00:
310 case KEY_DSA_CERT:
311 return KEY_DSA;
312 case KEY_ECDSA_CERT:
313 return KEY_ECDSA;
314 case KEY_ED25519_CERT:
315 return KEY_ED25519;
316 default:
317 return type;
318 }
319}
320
321#ifdef WITH_OPENSSL
322/* XXX: these are really begging for a table-driven approach */
323int
324sshkey_curve_name_to_nid(const char *name)
325{
326 if (strcmp(name, "nistp256") == 0)
327 return NID_X9_62_prime256v1;
328 else if (strcmp(name, "nistp384") == 0)
329 return NID_secp384r1;
330# ifdef OPENSSL_HAS_NISTP521
331 else if (strcmp(name, "nistp521") == 0)
332 return NID_secp521r1;
333# endif /* OPENSSL_HAS_NISTP521 */
334 else
335 return -1;
336}
337
338u_int
339sshkey_curve_nid_to_bits(int nid)
340{
341 switch (nid) {
342 case NID_X9_62_prime256v1:
343 return 256;
344 case NID_secp384r1:
345 return 384;
346# ifdef OPENSSL_HAS_NISTP521
347 case NID_secp521r1:
348 return 521;
349# endif /* OPENSSL_HAS_NISTP521 */
350 default:
351 return 0;
352 }
353}
354
355int
356sshkey_ecdsa_bits_to_nid(int bits)
357{
358 switch (bits) {
359 case 256:
360 return NID_X9_62_prime256v1;
361 case 384:
362 return NID_secp384r1;
363# ifdef OPENSSL_HAS_NISTP521
364 case 521:
365 return NID_secp521r1;
366# endif /* OPENSSL_HAS_NISTP521 */
367 default:
368 return -1;
369 }
370}
371
372const char *
373sshkey_curve_nid_to_name(int nid)
374{
375 switch (nid) {
376 case NID_X9_62_prime256v1:
377 return "nistp256";
378 case NID_secp384r1:
379 return "nistp384";
380# ifdef OPENSSL_HAS_NISTP521
381 case NID_secp521r1:
382 return "nistp521";
383# endif /* OPENSSL_HAS_NISTP521 */
384 default:
385 return NULL;
386 }
387}
388
389int
390sshkey_ec_nid_to_hash_alg(int nid)
391{
392 int kbits = sshkey_curve_nid_to_bits(nid);
393
394 if (kbits <= 0)
395 return -1;
396
397 /* RFC5656 section 6.2.1 */
398 if (kbits <= 256)
399 return SSH_DIGEST_SHA256;
400 else if (kbits <= 384)
401 return SSH_DIGEST_SHA384;
402 else
403 return SSH_DIGEST_SHA512;
404}
405#endif /* WITH_OPENSSL */
406
407static void
408cert_free(struct sshkey_cert *cert)
409{
410 u_int i;
411
412 if (cert == NULL)
413 return;
414 if (cert->certblob != NULL)
415 sshbuf_free(cert->certblob);
416 if (cert->critical != NULL)
417 sshbuf_free(cert->critical);
418 if (cert->extensions != NULL)
419 sshbuf_free(cert->extensions);
420 if (cert->key_id != NULL)
421 free(cert->key_id);
422 for (i = 0; i < cert->nprincipals; i++)
423 free(cert->principals[i]);
424 if (cert->principals != NULL)
425 free(cert->principals);
426 if (cert->signature_key != NULL)
427 sshkey_free(cert->signature_key);
428 explicit_bzero(cert, sizeof(*cert));
429 free(cert);
430}
431
432static struct sshkey_cert *
433cert_new(void)
434{
435 struct sshkey_cert *cert;
436
437 if ((cert = calloc(1, sizeof(*cert))) == NULL)
438 return NULL;
439 if ((cert->certblob = sshbuf_new()) == NULL ||
440 (cert->critical = sshbuf_new()) == NULL ||
441 (cert->extensions = sshbuf_new()) == NULL) {
442 cert_free(cert);
443 return NULL;
444 }
445 cert->key_id = NULL;
446 cert->principals = NULL;
447 cert->signature_key = NULL;
448 return cert;
449}
450
451struct sshkey *
452sshkey_new(int type)
453{
454 struct sshkey *k;
455#ifdef WITH_OPENSSL
456 RSA *rsa;
457 DSA *dsa;
458#endif /* WITH_OPENSSL */
459
460 if ((k = calloc(1, sizeof(*k))) == NULL)
461 return NULL;
462 k->type = type;
463 k->ecdsa = NULL;
464 k->ecdsa_nid = -1;
465 k->dsa = NULL;
466 k->rsa = NULL;
467 k->cert = NULL;
468 k->ed25519_sk = NULL;
469 k->ed25519_pk = NULL;
470 switch (k->type) {
471#ifdef WITH_OPENSSL
472 case KEY_RSA1:
473 case KEY_RSA:
474 case KEY_RSA_CERT_V00:
475 case KEY_RSA_CERT:
476 if ((rsa = RSA_new()) == NULL ||
477 (rsa->n = BN_new()) == NULL ||
478 (rsa->e = BN_new()) == NULL) {
479 if (rsa != NULL)
480 RSA_free(rsa);
481 free(k);
482 return NULL;
483 }
484 k->rsa = rsa;
485 break;
486 case KEY_DSA:
487 case KEY_DSA_CERT_V00:
488 case KEY_DSA_CERT:
489 if ((dsa = DSA_new()) == NULL ||
490 (dsa->p = BN_new()) == NULL ||
491 (dsa->q = BN_new()) == NULL ||
492 (dsa->g = BN_new()) == NULL ||
493 (dsa->pub_key = BN_new()) == NULL) {
494 if (dsa != NULL)
495 DSA_free(dsa);
496 free(k);
497 return NULL;
498 }
499 k->dsa = dsa;
500 break;
501 case KEY_ECDSA:
502 case KEY_ECDSA_CERT:
503 /* Cannot do anything until we know the group */
504 break;
505#endif /* WITH_OPENSSL */
506 case KEY_ED25519:
507 case KEY_ED25519_CERT:
508 /* no need to prealloc */
509 break;
510 case KEY_UNSPEC:
511 break;
512 default:
513 free(k);
514 return NULL;
515 break;
516 }
517
518 if (sshkey_is_cert(k)) {
519 if ((k->cert = cert_new()) == NULL) {
520 sshkey_free(k);
521 return NULL;
522 }
523 }
524
525 return k;
526}
527
528int
529sshkey_add_private(struct sshkey *k)
530{
531 switch (k->type) {
532#ifdef WITH_OPENSSL
533 case KEY_RSA1:
534 case KEY_RSA:
535 case KEY_RSA_CERT_V00:
536 case KEY_RSA_CERT:
537#define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
538 if (bn_maybe_alloc_failed(k->rsa->d) ||
539 bn_maybe_alloc_failed(k->rsa->iqmp) ||
540 bn_maybe_alloc_failed(k->rsa->q) ||
541 bn_maybe_alloc_failed(k->rsa->p) ||
542 bn_maybe_alloc_failed(k->rsa->dmq1) ||
543 bn_maybe_alloc_failed(k->rsa->dmp1))
544 return SSH_ERR_ALLOC_FAIL;
545 break;
546 case KEY_DSA:
547 case KEY_DSA_CERT_V00:
548 case KEY_DSA_CERT:
549 if (bn_maybe_alloc_failed(k->dsa->priv_key))
550 return SSH_ERR_ALLOC_FAIL;
551 break;
552#undef bn_maybe_alloc_failed
553 case KEY_ECDSA:
554 case KEY_ECDSA_CERT:
555 /* Cannot do anything until we know the group */
556 break;
557#endif /* WITH_OPENSSL */
558 case KEY_ED25519:
559 case KEY_ED25519_CERT:
560 /* no need to prealloc */
561 break;
562 case KEY_UNSPEC:
563 break;
564 default:
565 return SSH_ERR_INVALID_ARGUMENT;
566 }
567 return 0;
568}
569
570struct sshkey *
571sshkey_new_private(int type)
572{
573 struct sshkey *k = sshkey_new(type);
574
575 if (k == NULL)
576 return NULL;
577 if (sshkey_add_private(k) != 0) {
578 sshkey_free(k);
579 return NULL;
580 }
581 return k;
582}
583
584void
585sshkey_free(struct sshkey *k)
586{
587 if (k == NULL)
588 return;
589 switch (k->type) {
590#ifdef WITH_OPENSSL
591 case KEY_RSA1:
592 case KEY_RSA:
593 case KEY_RSA_CERT_V00:
594 case KEY_RSA_CERT:
595 if (k->rsa != NULL)
596 RSA_free(k->rsa);
597 k->rsa = NULL;
598 break;
599 case KEY_DSA:
600 case KEY_DSA_CERT_V00:
601 case KEY_DSA_CERT:
602 if (k->dsa != NULL)
603 DSA_free(k->dsa);
604 k->dsa = NULL;
605 break;
606# ifdef OPENSSL_HAS_ECC
607 case KEY_ECDSA:
608 case KEY_ECDSA_CERT:
609 if (k->ecdsa != NULL)
610 EC_KEY_free(k->ecdsa);
611 k->ecdsa = NULL;
612 break;
613# endif /* OPENSSL_HAS_ECC */
614#endif /* WITH_OPENSSL */
615 case KEY_ED25519:
616 case KEY_ED25519_CERT:
617 if (k->ed25519_pk) {
618 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
619 free(k->ed25519_pk);
620 k->ed25519_pk = NULL;
621 }
622 if (k->ed25519_sk) {
623 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
624 free(k->ed25519_sk);
625 k->ed25519_sk = NULL;
626 }
627 break;
628 case KEY_UNSPEC:
629 break;
630 default:
631 break;
632 }
633 if (sshkey_is_cert(k))
634 cert_free(k->cert);
635 explicit_bzero(k, sizeof(*k));
636 free(k);
637}
638
639static int
640cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
641{
642 if (a == NULL && b == NULL)
643 return 1;
644 if (a == NULL || b == NULL)
645 return 0;
646 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
647 return 0;
648 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
649 sshbuf_len(a->certblob)) != 0)
650 return 0;
651 return 1;
652}
653
654/*
655 * Compare public portions of key only, allowing comparisons between
656 * certificates and plain keys too.
657 */
658int
659sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
660{
661#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
662 BN_CTX *bnctx;
663#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
664
665 if (a == NULL || b == NULL ||
666 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
667 return 0;
668
669 switch (a->type) {
670#ifdef WITH_OPENSSL
671 case KEY_RSA1:
672 case KEY_RSA_CERT_V00:
673 case KEY_RSA_CERT:
674 case KEY_RSA:
675 return a->rsa != NULL && b->rsa != NULL &&
676 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
677 BN_cmp(a->rsa->n, b->rsa->n) == 0;
678 case KEY_DSA_CERT_V00:
679 case KEY_DSA_CERT:
680 case KEY_DSA:
681 return a->dsa != NULL && b->dsa != NULL &&
682 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
683 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
684 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
685 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
686# ifdef OPENSSL_HAS_ECC
687 case KEY_ECDSA_CERT:
688 case KEY_ECDSA:
689 if (a->ecdsa == NULL || b->ecdsa == NULL ||
690 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
691 EC_KEY_get0_public_key(b->ecdsa) == NULL)
692 return 0;
693 if ((bnctx = BN_CTX_new()) == NULL)
694 return 0;
695 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
696 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
697 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
698 EC_KEY_get0_public_key(a->ecdsa),
699 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
700 BN_CTX_free(bnctx);
701 return 0;
702 }
703 BN_CTX_free(bnctx);
704 return 1;
705# endif /* OPENSSL_HAS_ECC */
706#endif /* WITH_OPENSSL */
707 case KEY_ED25519:
708 case KEY_ED25519_CERT:
709 return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
710 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
711 default:
712 return 0;
713 }
714 /* NOTREACHED */
715}
716
717int
718sshkey_equal(const struct sshkey *a, const struct sshkey *b)
719{
720 if (a == NULL || b == NULL || a->type != b->type)
721 return 0;
722 if (sshkey_is_cert(a)) {
723 if (!cert_compare(a->cert, b->cert))
724 return 0;
725 }
726 return sshkey_equal_public(a, b);
727}
728
729static int
730to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
731{
732 int type, ret = SSH_ERR_INTERNAL_ERROR;
733 const char *typename;
734
735 if (key == NULL)
736 return SSH_ERR_INVALID_ARGUMENT;
737
738 type = force_plain ? sshkey_type_plain(key->type) : key->type;
739 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
740
741 switch (type) {
742#ifdef WITH_OPENSSL
743 case KEY_DSA_CERT_V00:
744 case KEY_RSA_CERT_V00:
745 case KEY_DSA_CERT:
746 case KEY_ECDSA_CERT:
747 case KEY_RSA_CERT:
748#endif /* WITH_OPENSSL */
749 case KEY_ED25519_CERT:
750 /* Use the existing blob */
751 /* XXX modified flag? */
752 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
753 return ret;
754 break;
755#ifdef WITH_OPENSSL
756 case KEY_DSA:
757 if (key->dsa == NULL)
758 return SSH_ERR_INVALID_ARGUMENT;
759 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
760 (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
761 (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
762 (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
763 (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
764 return ret;
765 break;
766# ifdef OPENSSL_HAS_ECC
767 case KEY_ECDSA:
768 if (key->ecdsa == NULL)
769 return SSH_ERR_INVALID_ARGUMENT;
770 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
771 (ret = sshbuf_put_cstring(b,
772 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
773 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
774 return ret;
775 break;
776# endif
777 case KEY_RSA:
778 if (key->rsa == NULL)
779 return SSH_ERR_INVALID_ARGUMENT;
780 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
781 (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
782 (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
783 return ret;
784 break;
785#endif /* WITH_OPENSSL */
786 case KEY_ED25519:
787 if (key->ed25519_pk == NULL)
788 return SSH_ERR_INVALID_ARGUMENT;
789 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
790 (ret = sshbuf_put_string(b,
791 key->ed25519_pk, ED25519_PK_SZ)) != 0)
792 return ret;
793 break;
794 default:
795 return SSH_ERR_KEY_TYPE_UNKNOWN;
796 }
797 return 0;
798}
799
800int
801sshkey_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
802{
803 return to_blob_buf(key, b, 0);
804}
805
806int
807sshkey_plain_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
808{
809 return to_blob_buf(key, b, 1);
810}
811
812static int
813to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
814{
815 int ret = SSH_ERR_INTERNAL_ERROR;
816 size_t len;
817 struct sshbuf *b = NULL;
818
819 if (lenp != NULL)
820 *lenp = 0;
821 if (blobp != NULL)
822 *blobp = NULL;
823 if ((b = sshbuf_new()) == NULL)
824 return SSH_ERR_ALLOC_FAIL;
825 if ((ret = to_blob_buf(key, b, force_plain)) != 0)
826 goto out;
827 len = sshbuf_len(b);
828 if (lenp != NULL)
829 *lenp = len;
830 if (blobp != NULL) {
831 if ((*blobp = malloc(len)) == NULL) {
832 ret = SSH_ERR_ALLOC_FAIL;
833 goto out;
834 }
835 memcpy(*blobp, sshbuf_ptr(b), len);
836 }
837 ret = 0;
838 out:
839 sshbuf_free(b);
840 return ret;
841}
842
843int
844sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
845{
846 return to_blob(key, blobp, lenp, 0);
847}
848
849int
850sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
851{
852 return to_blob(key, blobp, lenp, 1);
853}
854
855int
856sshkey_fingerprint_raw(const struct sshkey *k, enum sshkey_fp_type dgst_type,
857 u_char **retp, size_t *lenp)
858{
859 u_char *blob = NULL, *ret = NULL;
860 size_t blob_len = 0;
861 int hash_alg = -1, r = SSH_ERR_INTERNAL_ERROR;
862
863 if (retp != NULL)
864 *retp = NULL;
865 if (lenp != NULL)
866 *lenp = 0;
867
868 switch (dgst_type) {
869 case SSH_FP_MD5:
870 hash_alg = SSH_DIGEST_MD5;
871 break;
872 case SSH_FP_SHA1:
873 hash_alg = SSH_DIGEST_SHA1;
874 break;
875 case SSH_FP_SHA256:
876 hash_alg = SSH_DIGEST_SHA256;
877 break;
878 default:
879 r = SSH_ERR_INVALID_ARGUMENT;
880 goto out;
881 }
882
883 if (k->type == KEY_RSA1) {
884#ifdef WITH_OPENSSL
885 int nlen = BN_num_bytes(k->rsa->n);
886 int elen = BN_num_bytes(k->rsa->e);
887
888 blob_len = nlen + elen;
889 if (nlen >= INT_MAX - elen ||
890 (blob = malloc(blob_len)) == NULL) {
891 r = SSH_ERR_ALLOC_FAIL;
892 goto out;
893 }
894 BN_bn2bin(k->rsa->n, blob);
895 BN_bn2bin(k->rsa->e, blob + nlen);
896#endif /* WITH_OPENSSL */
897 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
898 goto out;
899 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
900 r = SSH_ERR_ALLOC_FAIL;
901 goto out;
902 }
903 if ((r = ssh_digest_memory(hash_alg, blob, blob_len,
904 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
905 goto out;
906 /* success */
907 if (retp != NULL) {
908 *retp = ret;
909 ret = NULL;
910 }
911 if (lenp != NULL)
912 *lenp = ssh_digest_bytes(hash_alg);
913 r = 0;
914 out:
915 free(ret);
916 if (blob != NULL) {
917 explicit_bzero(blob, blob_len);
918 free(blob);
919 }
920 return r;
921}
922
923static char *
924fingerprint_hex(u_char *dgst_raw, size_t dgst_raw_len)
925{
926 char *retval;
927 size_t i;
928
929 if ((retval = calloc(1, dgst_raw_len * 3 + 1)) == NULL)
930 return NULL;
931 for (i = 0; i < dgst_raw_len; i++) {
932 char hex[4];
933 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
934 strlcat(retval, hex, dgst_raw_len * 3 + 1);
935 }
936
937 /* Remove the trailing ':' character */
938 retval[(dgst_raw_len * 3) - 1] = '\0';
939 return retval;
940}
941
942static char *
943fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
944{
945 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
946 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
947 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
948 u_int i, j = 0, rounds, seed = 1;
949 char *retval;
950
951 rounds = (dgst_raw_len / 2) + 1;
952 if ((retval = calloc(rounds, 6)) == NULL)
953 return NULL;
954 retval[j++] = 'x';
955 for (i = 0; i < rounds; i++) {
956 u_int idx0, idx1, idx2, idx3, idx4;
957 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
958 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
959 seed) % 6;
960 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
961 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
962 (seed / 6)) % 6;
963 retval[j++] = vowels[idx0];
964 retval[j++] = consonants[idx1];
965 retval[j++] = vowels[idx2];
966 if ((i + 1) < rounds) {
967 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
968 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
969 retval[j++] = consonants[idx3];
970 retval[j++] = '-';
971 retval[j++] = consonants[idx4];
972 seed = ((seed * 5) +
973 ((((u_int)(dgst_raw[2 * i])) * 7) +
974 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
975 }
976 } else {
977 idx0 = seed % 6;
978 idx1 = 16;
979 idx2 = seed / 6;
980 retval[j++] = vowels[idx0];
981 retval[j++] = consonants[idx1];
982 retval[j++] = vowels[idx2];
983 }
984 }
985 retval[j++] = 'x';
986 retval[j++] = '\0';
987 return retval;
988}
989
990/*
991 * Draw an ASCII-Art representing the fingerprint so human brain can
992 * profit from its built-in pattern recognition ability.
993 * This technique is called "random art" and can be found in some
994 * scientific publications like this original paper:
995 *
996 * "Hash Visualization: a New Technique to improve Real-World Security",
997 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
998 * Techniques and E-Commerce (CrypTEC '99)
999 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1000 *
1001 * The subject came up in a talk by Dan Kaminsky, too.
1002 *
1003 * If you see the picture is different, the key is different.
1004 * If the picture looks the same, you still know nothing.
1005 *
1006 * The algorithm used here is a worm crawling over a discrete plane,
1007 * leaving a trace (augmenting the field) everywhere it goes.
1008 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1009 * makes the respective movement vector be ignored for this turn.
1010 * Graphs are not unambiguous, because circles in graphs can be
1011 * walked in either direction.
1012 */
1013
1014/*
1015 * Field sizes for the random art. Have to be odd, so the starting point
1016 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1017 * Else pictures would be too dense, and drawing the frame would
1018 * fail, too, because the key type would not fit in anymore.
1019 */
1020#define FLDBASE 8
1021#define FLDSIZE_Y (FLDBASE + 1)
1022#define FLDSIZE_X (FLDBASE * 2 + 1)
1023static char *
1024fingerprint_randomart(u_char *dgst_raw, size_t dgst_raw_len,
1025 const struct sshkey *k)
1026{
1027 /*
1028 * Chars to be used after each other every time the worm
1029 * intersects with itself. Matter of taste.
1030 */
1031 char *augmentation_string = " .o+=*BOX@%&#/^SE";
1032 char *retval, *p, title[FLDSIZE_X];
1033 u_char field[FLDSIZE_X][FLDSIZE_Y];
1034 size_t i, tlen;
1035 u_int b;
1036 int x, y, r;
1037 size_t len = strlen(augmentation_string) - 1;
1038
1039 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1040 return NULL;
1041
1042 /* initialize field */
1043 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1044 x = FLDSIZE_X / 2;
1045 y = FLDSIZE_Y / 2;
1046
1047 /* process raw key */
1048 for (i = 0; i < dgst_raw_len; i++) {
1049 int input;
1050 /* each byte conveys four 2-bit move commands */
1051 input = dgst_raw[i];
1052 for (b = 0; b < 4; b++) {
1053 /* evaluate 2 bit, rest is shifted later */
1054 x += (input & 0x1) ? 1 : -1;
1055 y += (input & 0x2) ? 1 : -1;
1056
1057 /* assure we are still in bounds */
1058 x = MAX(x, 0);
1059 y = MAX(y, 0);
1060 x = MIN(x, FLDSIZE_X - 1);
1061 y = MIN(y, FLDSIZE_Y - 1);
1062
1063 /* augment the field */
1064 if (field[x][y] < len - 2)
1065 field[x][y]++;
1066 input = input >> 2;
1067 }
1068 }
1069
1070 /* mark starting point and end point*/
1071 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1072 field[x][y] = len;
1073
1074 /* assemble title */
1075 r = snprintf(title, sizeof(title), "[%s %u]",
1076 sshkey_type(k), sshkey_size(k));
1077 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1078 if (r < 0 || r > (int)sizeof(title))
1079 snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1080 tlen = strlen(title);
1081
1082 /* output upper border */
1083 p = retval;
1084 *p++ = '+';
1085 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1086 *p++ = '-';
1087 memcpy(p, title, tlen);
1088 p += tlen;
1089 for (i = p - retval - 1; i < FLDSIZE_X; i++)
1090 *p++ = '-';
1091 *p++ = '+';
1092 *p++ = '\n';
1093
1094 /* output content */
1095 for (y = 0; y < FLDSIZE_Y; y++) {
1096 *p++ = '|';
1097 for (x = 0; x < FLDSIZE_X; x++)
1098 *p++ = augmentation_string[MIN(field[x][y], len)];
1099 *p++ = '|';
1100 *p++ = '\n';
1101 }
1102
1103 /* output lower border */
1104 *p++ = '+';
1105 for (i = 0; i < FLDSIZE_X; i++)
1106 *p++ = '-';
1107 *p++ = '+';
1108
1109 return retval;
1110}
1111
1112char *
1113sshkey_fingerprint(const struct sshkey *k, enum sshkey_fp_type dgst_type,
1114 enum sshkey_fp_rep dgst_rep)
1115{
1116 char *retval = NULL;
1117 u_char *dgst_raw;
1118 size_t dgst_raw_len;
1119
1120 if (sshkey_fingerprint_raw(k, dgst_type, &dgst_raw, &dgst_raw_len) != 0)
1121 return NULL;
1122 switch (dgst_rep) {
1123 case SSH_FP_HEX:
1124 retval = fingerprint_hex(dgst_raw, dgst_raw_len);
1125 break;
1126 case SSH_FP_BUBBLEBABBLE:
1127 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1128 break;
1129 case SSH_FP_RANDOMART:
1130 retval = fingerprint_randomart(dgst_raw, dgst_raw_len, k);
1131 break;
1132 default:
1133 explicit_bzero(dgst_raw, dgst_raw_len);
1134 free(dgst_raw);
1135 return NULL;
1136 }
1137 explicit_bzero(dgst_raw, dgst_raw_len);
1138 free(dgst_raw);
1139 return retval;
1140}
1141
1142#ifdef WITH_SSH1
1143/*
1144 * Reads a multiple-precision integer in decimal from the buffer, and advances
1145 * the pointer. The integer must already be initialized. This function is
1146 * permitted to modify the buffer. This leaves *cpp to point just beyond the
1147 * last processed character.
1148 */
1149static int
1150read_decimal_bignum(char **cpp, BIGNUM *v)
1151{
1152 char *cp;
1153 size_t e;
1154 int skip = 1; /* skip white space */
1155
1156 cp = *cpp;
1157 while (*cp == ' ' || *cp == '\t')
1158 cp++;
1159 e = strspn(cp, "0123456789");
1160 if (e == 0)
1161 return SSH_ERR_INVALID_FORMAT;
1162 if (e > SSHBUF_MAX_BIGNUM * 3)
1163 return SSH_ERR_BIGNUM_TOO_LARGE;
1164 if (cp[e] == '\0')
1165 skip = 0;
1166 else if (index(" \t\r\n", cp[e]) == NULL)
1167 return SSH_ERR_INVALID_FORMAT;
1168 cp[e] = '\0';
1169 if (BN_dec2bn(&v, cp) <= 0)
1170 return SSH_ERR_INVALID_FORMAT;
1171 *cpp = cp + e + skip;
1172 return 0;
1173}
1174#endif /* WITH_SSH1 */
1175
1176/* returns 0 ok, and < 0 error */
1177int
1178sshkey_read(struct sshkey *ret, char **cpp)
1179{
1180 struct sshkey *k;
1181 int retval = SSH_ERR_INVALID_FORMAT;
1182 char *cp, *space;
1183 int r, type, curve_nid = -1;
1184 struct sshbuf *blob;
1185#ifdef WITH_SSH1
1186 char *ep;
1187 u_long bits;
1188#endif /* WITH_SSH1 */
1189
1190 cp = *cpp;
1191
1192 switch (ret->type) {
1193 case KEY_RSA1:
1194#ifdef WITH_SSH1
1195 /* Get number of bits. */
1196 bits = strtoul(cp, &ep, 10);
1197 if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1198 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1199 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1200 /* Get public exponent, public modulus. */
1201 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1202 return r;
1203 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1204 return r;
1205 *cpp = ep;
1206 /* validate the claimed number of bits */
1207 if (BN_num_bits(ret->rsa->n) != (int)bits)
1208 return SSH_ERR_KEY_BITS_MISMATCH;
1209 retval = 0;
1210#endif /* WITH_SSH1 */
1211 break;
1212 case KEY_UNSPEC:
1213 case KEY_RSA:
1214 case KEY_DSA:
1215 case KEY_ECDSA:
1216 case KEY_ED25519:
1217 case KEY_DSA_CERT_V00:
1218 case KEY_RSA_CERT_V00:
1219 case KEY_DSA_CERT:
1220 case KEY_ECDSA_CERT:
1221 case KEY_RSA_CERT:
1222 case KEY_ED25519_CERT:
1223 space = strchr(cp, ' ');
1224 if (space == NULL)
1225 return SSH_ERR_INVALID_FORMAT;
1226 *space = '\0';
1227 type = sshkey_type_from_name(cp);
1228 if (sshkey_type_plain(type) == KEY_ECDSA &&
1229 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1230 return SSH_ERR_EC_CURVE_INVALID;
1231 *space = ' ';
1232 if (type == KEY_UNSPEC)
1233 return SSH_ERR_INVALID_FORMAT;
1234 cp = space+1;
1235 if (*cp == '\0')
1236 return SSH_ERR_INVALID_FORMAT;
1237 if (ret->type == KEY_UNSPEC) {
1238 ret->type = type;
1239 } else if (ret->type != type)
1240 return SSH_ERR_KEY_TYPE_MISMATCH;
1241 if ((blob = sshbuf_new()) == NULL)
1242 return SSH_ERR_ALLOC_FAIL;
1243 /* trim comment */
1244 space = strchr(cp, ' ');
1245 if (space)
1246 *space = '\0';
1247 if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1248 sshbuf_free(blob);
1249 return r;
1250 }
1251 if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1252 sshbuf_len(blob), &k)) != 0) {
1253 sshbuf_free(blob);
1254 return r;
1255 }
1256 sshbuf_free(blob);
1257 if (k->type != type) {
1258 sshkey_free(k);
1259 return SSH_ERR_KEY_TYPE_MISMATCH;
1260 }
1261 if (sshkey_type_plain(type) == KEY_ECDSA &&
1262 curve_nid != k->ecdsa_nid) {
1263 sshkey_free(k);
1264 return SSH_ERR_EC_CURVE_MISMATCH;
1265 }
1266/*XXXX*/
1267 if (sshkey_is_cert(ret)) {
1268 if (!sshkey_is_cert(k)) {
1269 sshkey_free(k);
1270 return SSH_ERR_EXPECTED_CERT;
1271 }
1272 if (ret->cert != NULL)
1273 cert_free(ret->cert);
1274 ret->cert = k->cert;
1275 k->cert = NULL;
1276 }
1277#ifdef WITH_OPENSSL
1278 if (sshkey_type_plain(ret->type) == KEY_RSA) {
1279 if (ret->rsa != NULL)
1280 RSA_free(ret->rsa);
1281 ret->rsa = k->rsa;
1282 k->rsa = NULL;
1283#ifdef DEBUG_PK
1284 RSA_print_fp(stderr, ret->rsa, 8);
1285#endif
1286 }
1287 if (sshkey_type_plain(ret->type) == KEY_DSA) {
1288 if (ret->dsa != NULL)
1289 DSA_free(ret->dsa);
1290 ret->dsa = k->dsa;
1291 k->dsa = NULL;
1292#ifdef DEBUG_PK
1293 DSA_print_fp(stderr, ret->dsa, 8);
1294#endif
1295 }
1296# ifdef OPENSSL_HAS_ECC
1297 if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1298 if (ret->ecdsa != NULL)
1299 EC_KEY_free(ret->ecdsa);
1300 ret->ecdsa = k->ecdsa;
1301 ret->ecdsa_nid = k->ecdsa_nid;
1302 k->ecdsa = NULL;
1303 k->ecdsa_nid = -1;
1304#ifdef DEBUG_PK
1305 sshkey_dump_ec_key(ret->ecdsa);
1306#endif
1307 }
1308# endif /* OPENSSL_HAS_ECC */
1309#endif /* WITH_OPENSSL */
1310 if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1311 free(ret->ed25519_pk);
1312 ret->ed25519_pk = k->ed25519_pk;
1313 k->ed25519_pk = NULL;
1314#ifdef DEBUG_PK
1315 /* XXX */
1316#endif
1317 }
1318 retval = 0;
1319/*XXXX*/
1320 sshkey_free(k);
1321 if (retval != 0)
1322 break;
1323 /* advance cp: skip whitespace and data */
1324 while (*cp == ' ' || *cp == '\t')
1325 cp++;
1326 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
1327 cp++;
1328 *cpp = cp;
1329 break;
1330 default:
1331 return SSH_ERR_INVALID_ARGUMENT;
1332 }
1333 return retval;
1334}
1335
1336int
1337sshkey_write(const struct sshkey *key, FILE *f)
1338{
1339 int ret = SSH_ERR_INTERNAL_ERROR;
1340 struct sshbuf *b = NULL, *bb = NULL;
1341 char *uu = NULL;
1342#ifdef WITH_SSH1
1343 u_int bits = 0;
1344 char *dec_e = NULL, *dec_n = NULL;
1345#endif /* WITH_SSH1 */
1346
1347 if (sshkey_is_cert(key)) {
1348 if (key->cert == NULL)
1349 return SSH_ERR_EXPECTED_CERT;
1350 if (sshbuf_len(key->cert->certblob) == 0)
1351 return SSH_ERR_KEY_LACKS_CERTBLOB;
1352 }
1353 if ((b = sshbuf_new()) == NULL)
1354 return SSH_ERR_ALLOC_FAIL;
1355 switch (key->type) {
1356#ifdef WITH_SSH1
1357 case KEY_RSA1:
1358 if (key->rsa == NULL || key->rsa->e == NULL ||
1359 key->rsa->n == NULL) {
1360 ret = SSH_ERR_INVALID_ARGUMENT;
1361 goto out;
1362 }
1363 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1364 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1365 ret = SSH_ERR_ALLOC_FAIL;
1366 goto out;
1367 }
1368 /* size of modulus 'n' */
1369 if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1370 ret = SSH_ERR_INVALID_ARGUMENT;
1371 goto out;
1372 }
1373 if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1374 goto out;
1375#endif /* WITH_SSH1 */
1376 break;
1377#ifdef WITH_OPENSSL
1378 case KEY_DSA:
1379 case KEY_DSA_CERT_V00:
1380 case KEY_DSA_CERT:
1381 case KEY_ECDSA:
1382 case KEY_ECDSA_CERT:
1383 case KEY_RSA:
1384 case KEY_RSA_CERT_V00:
1385 case KEY_RSA_CERT:
1386#endif /* WITH_OPENSSL */
1387 case KEY_ED25519:
1388 case KEY_ED25519_CERT:
1389 if ((bb = sshbuf_new()) == NULL) {
1390 ret = SSH_ERR_ALLOC_FAIL;
1391 goto out;
1392 }
1393 if ((ret = sshkey_to_blob_buf(key, bb)) != 0)
1394 goto out;
1395 if ((uu = sshbuf_dtob64(bb)) == NULL) {
1396 ret = SSH_ERR_ALLOC_FAIL;
1397 goto out;
1398 }
1399 if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
1400 goto out;
1401 if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
1402 goto out;
1403 break;
1404 default:
1405 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1406 goto out;
1407 }
1408 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1409 if (feof(f))
1410 errno = EPIPE;
1411 ret = SSH_ERR_SYSTEM_ERROR;
1412 goto out;
1413 }
1414 ret = 0;
1415 out:
1416 if (b != NULL)
1417 sshbuf_free(b);
1418 if (bb != NULL)
1419 sshbuf_free(bb);
1420 if (uu != NULL)
1421 free(uu);
1422#ifdef WITH_SSH1
1423 if (dec_e != NULL)
1424 OPENSSL_free(dec_e);
1425 if (dec_n != NULL)
1426 OPENSSL_free(dec_n);
1427#endif /* WITH_SSH1 */
1428 return ret;
1429}
1430
1431const char *
1432sshkey_cert_type(const struct sshkey *k)
1433{
1434 switch (k->cert->type) {
1435 case SSH2_CERT_TYPE_USER:
1436 return "user";
1437 case SSH2_CERT_TYPE_HOST:
1438 return "host";
1439 default:
1440 return "unknown";
1441 }
1442}
1443
1444#ifdef WITH_OPENSSL
1445static int
1446rsa_generate_private_key(u_int bits, RSA **rsap)
1447{
1448 RSA *private = NULL;
1449 BIGNUM *f4 = NULL;
1450 int ret = SSH_ERR_INTERNAL_ERROR;
1451
1452 if (rsap == NULL ||
1453 bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1454 bits > SSHBUF_MAX_BIGNUM * 8)
1455 return SSH_ERR_INVALID_ARGUMENT;
1456 *rsap = NULL;
1457 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1458 ret = SSH_ERR_ALLOC_FAIL;
1459 goto out;
1460 }
1461 if (!BN_set_word(f4, RSA_F4) ||
1462 !RSA_generate_key_ex(private, bits, f4, NULL)) {
1463 ret = SSH_ERR_LIBCRYPTO_ERROR;
1464 goto out;
1465 }
1466 *rsap = private;
1467 private = NULL;
1468 ret = 0;
1469 out:
1470 if (private != NULL)
1471 RSA_free(private);
1472 if (f4 != NULL)
1473 BN_free(f4);
1474 return ret;
1475}
1476
1477static int
1478dsa_generate_private_key(u_int bits, DSA **dsap)
1479{
1480 DSA *private;
1481 int ret = SSH_ERR_INTERNAL_ERROR;
1482
1483 if (dsap == NULL || bits != 1024)
1484 return SSH_ERR_INVALID_ARGUMENT;
1485 if ((private = DSA_new()) == NULL) {
1486 ret = SSH_ERR_ALLOC_FAIL;
1487 goto out;
1488 }
1489 *dsap = NULL;
1490 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1491 NULL, NULL) || !DSA_generate_key(private)) {
1492 DSA_free(private);
1493 ret = SSH_ERR_LIBCRYPTO_ERROR;
1494 goto out;
1495 }
1496 *dsap = private;
1497 private = NULL;
1498 ret = 0;
1499 out:
1500 if (private != NULL)
1501 DSA_free(private);
1502 return ret;
1503}
1504
1505# ifdef OPENSSL_HAS_ECC
1506int
1507sshkey_ecdsa_key_to_nid(EC_KEY *k)
1508{
1509 EC_GROUP *eg;
1510 int nids[] = {
1511 NID_X9_62_prime256v1,
1512 NID_secp384r1,
1513# ifdef OPENSSL_HAS_NISTP521
1514 NID_secp521r1,
1515# endif /* OPENSSL_HAS_NISTP521 */
1516 -1
1517 };
1518 int nid;
1519 u_int i;
1520 BN_CTX *bnctx;
1521 const EC_GROUP *g = EC_KEY_get0_group(k);
1522
1523 /*
1524 * The group may be stored in a ASN.1 encoded private key in one of two
1525 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1526 * or explicit group parameters encoded into the key blob. Only the
1527 * "named group" case sets the group NID for us, but we can figure
1528 * it out for the other case by comparing against all the groups that
1529 * are supported.
1530 */
1531 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1532 return nid;
1533 if ((bnctx = BN_CTX_new()) == NULL)
1534 return -1;
1535 for (i = 0; nids[i] != -1; i++) {
1536 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1537 BN_CTX_free(bnctx);
1538 return -1;
1539 }
1540 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1541 break;
1542 EC_GROUP_free(eg);
1543 }
1544 BN_CTX_free(bnctx);
1545 if (nids[i] != -1) {
1546 /* Use the group with the NID attached */
1547 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1548 if (EC_KEY_set_group(k, eg) != 1) {
1549 EC_GROUP_free(eg);
1550 return -1;
1551 }
1552 }
1553 return nids[i];
1554}
1555
1556static int
1557ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1558{
1559 EC_KEY *private;
1560 int ret = SSH_ERR_INTERNAL_ERROR;
1561
1562 if (nid == NULL || ecdsap == NULL ||
1563 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1564 return SSH_ERR_INVALID_ARGUMENT;
1565 *ecdsap = NULL;
1566 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1567 ret = SSH_ERR_ALLOC_FAIL;
1568 goto out;
1569 }
1570 if (EC_KEY_generate_key(private) != 1) {
1571 ret = SSH_ERR_LIBCRYPTO_ERROR;
1572 goto out;
1573 }
1574 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1575 *ecdsap = private;
1576 private = NULL;
1577 ret = 0;
1578 out:
1579 if (private != NULL)
1580 EC_KEY_free(private);
1581 return ret;
1582}
1583# endif /* OPENSSL_HAS_ECC */
1584#endif /* WITH_OPENSSL */
1585
1586int
1587sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1588{
1589 struct sshkey *k;
1590 int ret = SSH_ERR_INTERNAL_ERROR;
1591
1592 if (keyp == NULL)
1593 return SSH_ERR_INVALID_ARGUMENT;
1594 *keyp = NULL;
1595 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1596 return SSH_ERR_ALLOC_FAIL;
1597 switch (type) {
1598 case KEY_ED25519:
1599 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1600 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1601 ret = SSH_ERR_ALLOC_FAIL;
1602 break;
1603 }
1604 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1605 ret = 0;
1606 break;
1607#ifdef WITH_OPENSSL
1608 case KEY_DSA:
1609 ret = dsa_generate_private_key(bits, &k->dsa);
1610 break;
1611# ifdef OPENSSL_HAS_ECC
1612 case KEY_ECDSA:
1613 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1614 &k->ecdsa);
1615 break;
1616# endif /* OPENSSL_HAS_ECC */
1617 case KEY_RSA:
1618 case KEY_RSA1:
1619 ret = rsa_generate_private_key(bits, &k->rsa);
1620 break;
1621#endif /* WITH_OPENSSL */
1622 default:
1623 ret = SSH_ERR_INVALID_ARGUMENT;
1624 }
1625 if (ret == 0) {
1626 k->type = type;
1627 *keyp = k;
1628 } else
1629 sshkey_free(k);
1630 return ret;
1631}
1632
1633int
1634sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1635{
1636 u_int i;
1637 const struct sshkey_cert *from;
1638 struct sshkey_cert *to;
1639 int ret = SSH_ERR_INTERNAL_ERROR;
1640
1641 if (to_key->cert != NULL) {
1642 cert_free(to_key->cert);
1643 to_key->cert = NULL;
1644 }
1645
1646 if ((from = from_key->cert) == NULL)
1647 return SSH_ERR_INVALID_ARGUMENT;
1648
1649 if ((to = to_key->cert = cert_new()) == NULL)
1650 return SSH_ERR_ALLOC_FAIL;
1651
1652 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1653 (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1654 (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1655 return ret;
1656
1657 to->serial = from->serial;
1658 to->type = from->type;
1659 if (from->key_id == NULL)
1660 to->key_id = NULL;
1661 else if ((to->key_id = strdup(from->key_id)) == NULL)
1662 return SSH_ERR_ALLOC_FAIL;
1663 to->valid_after = from->valid_after;
1664 to->valid_before = from->valid_before;
1665 if (from->signature_key == NULL)
1666 to->signature_key = NULL;
1667 else if ((ret = sshkey_from_private(from->signature_key,
1668 &to->signature_key)) != 0)
1669 return ret;
1670
1671 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1672 return SSH_ERR_INVALID_ARGUMENT;
1673 if (from->nprincipals > 0) {
1674 if ((to->principals = calloc(from->nprincipals,
1675 sizeof(*to->principals))) == NULL)
1676 return SSH_ERR_ALLOC_FAIL;
1677 for (i = 0; i < from->nprincipals; i++) {
1678 to->principals[i] = strdup(from->principals[i]);
1679 if (to->principals[i] == NULL) {
1680 to->nprincipals = i;
1681 return SSH_ERR_ALLOC_FAIL;
1682 }
1683 }
1684 }
1685 to->nprincipals = from->nprincipals;
1686 return 0;
1687}
1688
1689int
1690sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1691{
1692 struct sshkey *n = NULL;
1693 int ret = SSH_ERR_INTERNAL_ERROR;
1694
1695 if (pkp != NULL)
1696 *pkp = NULL;
1697
1698 switch (k->type) {
1699#ifdef WITH_OPENSSL
1700 case KEY_DSA:
1701 case KEY_DSA_CERT_V00:
1702 case KEY_DSA_CERT:
1703 if ((n = sshkey_new(k->type)) == NULL)
1704 return SSH_ERR_ALLOC_FAIL;
1705 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1706 (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1707 (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1708 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1709 sshkey_free(n);
1710 return SSH_ERR_ALLOC_FAIL;
1711 }
1712 break;
1713# ifdef OPENSSL_HAS_ECC
1714 case KEY_ECDSA:
1715 case KEY_ECDSA_CERT:
1716 if ((n = sshkey_new(k->type)) == NULL)
1717 return SSH_ERR_ALLOC_FAIL;
1718 n->ecdsa_nid = k->ecdsa_nid;
1719 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1720 if (n->ecdsa == NULL) {
1721 sshkey_free(n);
1722 return SSH_ERR_ALLOC_FAIL;
1723 }
1724 if (EC_KEY_set_public_key(n->ecdsa,
1725 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1726 sshkey_free(n);
1727 return SSH_ERR_LIBCRYPTO_ERROR;
1728 }
1729 break;
1730# endif /* OPENSSL_HAS_ECC */
1731 case KEY_RSA:
1732 case KEY_RSA1:
1733 case KEY_RSA_CERT_V00:
1734 case KEY_RSA_CERT:
1735 if ((n = sshkey_new(k->type)) == NULL)
1736 return SSH_ERR_ALLOC_FAIL;
1737 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1738 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1739 sshkey_free(n);
1740 return SSH_ERR_ALLOC_FAIL;
1741 }
1742 break;
1743#endif /* WITH_OPENSSL */
1744 case KEY_ED25519:
1745 case KEY_ED25519_CERT:
1746 if ((n = sshkey_new(k->type)) == NULL)
1747 return SSH_ERR_ALLOC_FAIL;
1748 if (k->ed25519_pk != NULL) {
1749 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1750 sshkey_free(n);
1751 return SSH_ERR_ALLOC_FAIL;
1752 }
1753 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1754 }
1755 break;
1756 default:
1757 return SSH_ERR_KEY_TYPE_UNKNOWN;
1758 }
1759 if (sshkey_is_cert(k)) {
1760 if ((ret = sshkey_cert_copy(k, n)) != 0) {
1761 sshkey_free(n);
1762 return ret;
1763 }
1764 }
1765 *pkp = n;
1766 return 0;
1767}
1768
1769static int
1770cert_parse(struct sshbuf *b, struct sshkey *key, const u_char *blob,
1771 size_t blen)
1772{
1773 u_char *principals = NULL, *critical = NULL, *exts = NULL;
1774 u_char *sig_key = NULL, *sig = NULL;
1775 size_t signed_len, plen, clen, sklen, slen, kidlen, elen;
1776 struct sshbuf *tmp;
1777 char *principal;
1778 int ret = SSH_ERR_INTERNAL_ERROR;
1779 int v00 = sshkey_cert_is_legacy(key);
1780 char **oprincipals;
1781
1782 if ((tmp = sshbuf_new()) == NULL)
1783 return SSH_ERR_ALLOC_FAIL;
1784
1785 /* Copy the entire key blob for verification and later serialisation */
1786 if ((ret = sshbuf_put(key->cert->certblob, blob, blen)) != 0)
1787 return ret;
1788
1789 elen = 0; /* Not touched for v00 certs */
1790 principals = exts = critical = sig_key = sig = NULL;
1791 if ((!v00 && (ret = sshbuf_get_u64(b, &key->cert->serial)) != 0) ||
1792 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1793 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1794 (ret = sshbuf_get_string(b, &principals, &plen)) != 0 ||
1795 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1796 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1797 (ret = sshbuf_get_string(b, &critical, &clen)) != 0 ||
1798 (!v00 && (ret = sshbuf_get_string(b, &exts, &elen)) != 0) ||
1799 (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
1800 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1801 (ret = sshbuf_get_string(b, &sig_key, &sklen)) != 0) {
1802 /* XXX debug print error for ret */
1803 ret = SSH_ERR_INVALID_FORMAT;
1804 goto out;
1805 }
1806
1807 /* Signature is left in the buffer so we can calculate this length */
1808 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1809
1810 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1811 ret = SSH_ERR_INVALID_FORMAT;
1812 goto out;
1813 }
1814
1815 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1816 key->cert->type != SSH2_CERT_TYPE_HOST) {
1817 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1818 goto out;
1819 }
1820
1821 if ((ret = sshbuf_put(tmp, principals, plen)) != 0)
1822 goto out;
1823 while (sshbuf_len(tmp) > 0) {
1824 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1825 ret = SSH_ERR_INVALID_FORMAT;
1826 goto out;
1827 }
1828 if ((ret = sshbuf_get_cstring(tmp, &principal, &plen)) != 0) {
1829 ret = SSH_ERR_INVALID_FORMAT;
1830 goto out;
1831 }
1832 oprincipals = key->cert->principals;
1833 key->cert->principals = realloc(key->cert->principals,
1834 (key->cert->nprincipals + 1) *
1835 sizeof(*key->cert->principals));
1836 if (key->cert->principals == NULL) {
1837 free(principal);
1838 key->cert->principals = oprincipals;
1839 ret = SSH_ERR_ALLOC_FAIL;
1840 goto out;
1841 }
1842 key->cert->principals[key->cert->nprincipals++] = principal;
1843 }
1844
1845 sshbuf_reset(tmp);
1846
1847 if ((ret = sshbuf_put(key->cert->critical, critical, clen)) != 0 ||
1848 (ret = sshbuf_put(tmp, critical, clen)) != 0)
1849 goto out;
1850
1851 /* validate structure */
1852 while (sshbuf_len(tmp) != 0) {
1853 if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
1854 (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
1855 ret = SSH_ERR_INVALID_FORMAT;
1856 goto out;
1857 }
1858 }
1859 sshbuf_reset(tmp);
1860
1861 if ((ret = sshbuf_put(key->cert->extensions, exts, elen)) != 0 ||
1862 (ret = sshbuf_put(tmp, exts, elen)) != 0)
1863 goto out;
1864
1865 /* validate structure */
1866 while (sshbuf_len(tmp) != 0) {
1867 if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
1868 (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
1869 ret = SSH_ERR_INVALID_FORMAT;
1870 goto out;
1871 }
1872 }
1873 sshbuf_reset(tmp);
1874
1875 if (sshkey_from_blob_internal(sig_key, sklen,
1876 &key->cert->signature_key, 0) != 0) {
1877 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1878 goto out;
1879 }
1880 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1881 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1882 goto out;
1883 }
1884
1885 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1886 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1887 goto out;
1888 ret = 0;
1889
1890 out:
1891 sshbuf_free(tmp);
1892 free(principals);
1893 free(critical);
1894 free(exts);
1895 free(sig_key);
1896 free(sig);
1897 return ret;
1898}
1899
1900static int
1901sshkey_from_blob_internal(const u_char *blob, size_t blen,
1902 struct sshkey **keyp, int allow_cert)
1903{
1904 struct sshbuf *b = NULL;
1905 int type, nid = -1, ret = SSH_ERR_INTERNAL_ERROR;
1906 char *ktype = NULL, *curve = NULL;
1907 struct sshkey *key = NULL;
1908 size_t len;
1909 u_char *pk = NULL;
1910#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
1911 EC_POINT *q = NULL;
1912#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
1913
1914#ifdef DEBUG_PK /* XXX */
1915 dump_base64(stderr, blob, blen);
1916#endif
1917 *keyp = NULL;
1918 if ((b = sshbuf_from(blob, blen)) == NULL)
1919 return SSH_ERR_ALLOC_FAIL;
1920 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1921 ret = SSH_ERR_INVALID_FORMAT;
1922 goto out;
1923 }
1924
1925 type = sshkey_type_from_name(ktype);
1926 if (sshkey_type_plain(type) == KEY_ECDSA)
1927 nid = sshkey_ecdsa_nid_from_name(ktype);
1928 if (!allow_cert && sshkey_type_is_cert(type)) {
1929 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1930 goto out;
1931 }
1932 switch (type) {
1933#ifdef WITH_OPENSSL
1934 case KEY_RSA_CERT:
1935 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1936 ret = SSH_ERR_INVALID_FORMAT;
1937 goto out;
1938 }
1939 /* FALLTHROUGH */
1940 case KEY_RSA:
1941 case KEY_RSA_CERT_V00:
1942 if ((key = sshkey_new(type)) == NULL) {
1943 ret = SSH_ERR_ALLOC_FAIL;
1944 goto out;
1945 }
1946 if (sshbuf_get_bignum2(b, key->rsa->e) == -1 ||
1947 sshbuf_get_bignum2(b, key->rsa->n) == -1) {
1948 ret = SSH_ERR_INVALID_FORMAT;
1949 goto out;
1950 }
1951#ifdef DEBUG_PK
1952 RSA_print_fp(stderr, key->rsa, 8);
1953#endif
1954 break;
1955 case KEY_DSA_CERT:
1956 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1957 ret = SSH_ERR_INVALID_FORMAT;
1958 goto out;
1959 }
1960 /* FALLTHROUGH */
1961 case KEY_DSA:
1962 case KEY_DSA_CERT_V00:
1963 if ((key = sshkey_new(type)) == NULL) {
1964 ret = SSH_ERR_ALLOC_FAIL;
1965 goto out;
1966 }
1967 if (sshbuf_get_bignum2(b, key->dsa->p) == -1 ||
1968 sshbuf_get_bignum2(b, key->dsa->q) == -1 ||
1969 sshbuf_get_bignum2(b, key->dsa->g) == -1 ||
1970 sshbuf_get_bignum2(b, key->dsa->pub_key) == -1) {
1971 ret = SSH_ERR_INVALID_FORMAT;
1972 goto out;
1973 }
1974#ifdef DEBUG_PK
1975 DSA_print_fp(stderr, key->dsa, 8);
1976#endif
1977 break;
1978 case KEY_ECDSA_CERT:
1979 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1980 ret = SSH_ERR_INVALID_FORMAT;
1981 goto out;
1982 }
1983 /* FALLTHROUGH */
1984# ifdef OPENSSL_HAS_ECC
1985 case KEY_ECDSA:
1986 if ((key = sshkey_new(type)) == NULL) {
1987 ret = SSH_ERR_ALLOC_FAIL;
1988 goto out;
1989 }
1990 key->ecdsa_nid = nid;
1991 if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1992 ret = SSH_ERR_INVALID_FORMAT;
1993 goto out;
1994 }
1995 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1996 ret = SSH_ERR_EC_CURVE_MISMATCH;
1997 goto out;
1998 }
1999 if (key->ecdsa != NULL)
2000 EC_KEY_free(key->ecdsa);
2001 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2002 == NULL) {
2003 ret = SSH_ERR_EC_CURVE_INVALID;
2004 goto out;
2005 }
2006 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2007 ret = SSH_ERR_ALLOC_FAIL;
2008 goto out;
2009 }
2010 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2011 ret = SSH_ERR_INVALID_FORMAT;
2012 goto out;
2013 }
2014 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2015 q) != 0) {
2016 ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2017 goto out;
2018 }
2019 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2020 /* XXX assume it is a allocation error */
2021 ret = SSH_ERR_ALLOC_FAIL;
2022 goto out;
2023 }
2024#ifdef DEBUG_PK
2025 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2026#endif
2027 break;
2028# endif /* OPENSSL_HAS_ECC */
2029#endif /* WITH_OPENSSL */
2030 case KEY_ED25519_CERT:
2031 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2032 ret = SSH_ERR_INVALID_FORMAT;
2033 goto out;
2034 }
2035 /* FALLTHROUGH */
2036 case KEY_ED25519:
2037 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2038 goto out;
2039 if (len != ED25519_PK_SZ) {
2040 ret = SSH_ERR_INVALID_FORMAT;
2041 goto out;
2042 }
2043 if ((key = sshkey_new(type)) == NULL) {
2044 ret = SSH_ERR_ALLOC_FAIL;
2045 goto out;
2046 }
2047 key->ed25519_pk = pk;
2048 pk = NULL;
2049 break;
2050 case KEY_UNSPEC:
2051 if ((key = sshkey_new(type)) == NULL) {
2052 ret = SSH_ERR_ALLOC_FAIL;
2053 goto out;
2054 }
2055 break;
2056 default:
2057 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2058 goto out;
2059 }
2060
2061 /* Parse certificate potion */
2062 if (sshkey_is_cert(key) &&
2063 (ret = cert_parse(b, key, blob, blen)) != 0)
2064 goto out;
2065
2066 if (key != NULL && sshbuf_len(b) != 0) {
2067 ret = SSH_ERR_INVALID_FORMAT;
2068 goto out;
2069 }
2070 ret = 0;
2071 *keyp = key;
2072 key = NULL;
2073 out:
2074 sshbuf_free(b);
2075 sshkey_free(key);
2076 free(ktype);
2077 free(curve);
2078 free(pk);
2079#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2080 if (q != NULL)
2081 EC_POINT_free(q);
2082#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2083 return ret;
2084}
2085
2086int
2087sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2088{
2089 return sshkey_from_blob_internal(blob, blen, keyp, 1);
2090}
2091
2092int
2093sshkey_sign(const struct sshkey *key,
2094 u_char **sigp, size_t *lenp,
2095 const u_char *data, size_t datalen, u_int compat)
2096{
2097 if (sigp != NULL)
2098 *sigp = NULL;
2099 if (lenp != NULL)
2100 *lenp = 0;
2101 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2102 return SSH_ERR_INVALID_ARGUMENT;
2103 switch (key->type) {
2104#ifdef WITH_OPENSSL
2105 case KEY_DSA_CERT_V00:
2106 case KEY_DSA_CERT:
2107 case KEY_DSA:
2108 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2109# ifdef OPENSSL_HAS_ECC
2110 case KEY_ECDSA_CERT:
2111 case KEY_ECDSA:
2112 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2113# endif /* OPENSSL_HAS_ECC */
2114 case KEY_RSA_CERT_V00:
2115 case KEY_RSA_CERT:
2116 case KEY_RSA:
2117 return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2118#endif /* WITH_OPENSSL */
2119 case KEY_ED25519:
2120 case KEY_ED25519_CERT:
2121 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2122 default:
2123 return SSH_ERR_KEY_TYPE_UNKNOWN;
2124 }
2125}
2126
2127/*
2128 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2129 */
2130int
2131sshkey_verify(const struct sshkey *key,
2132 const u_char *sig, size_t siglen,
2133 const u_char *data, size_t dlen, u_int compat)
2134{
2135 if (siglen == 0)
2136 return -1;
2137
2138 if (dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2139 return SSH_ERR_INVALID_ARGUMENT;
2140 switch (key->type) {
2141#ifdef WITH_OPENSSL
2142 case KEY_DSA_CERT_V00:
2143 case KEY_DSA_CERT:
2144 case KEY_DSA:
2145 return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2146# ifdef OPENSSL_HAS_ECC
2147 case KEY_ECDSA_CERT:
2148 case KEY_ECDSA:
2149 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2150# endif /* OPENSSL_HAS_ECC */
2151 case KEY_RSA_CERT_V00:
2152 case KEY_RSA_CERT:
2153 case KEY_RSA:
2154 return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2155#endif /* WITH_OPENSSL */
2156 case KEY_ED25519:
2157 case KEY_ED25519_CERT:
2158 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2159 default:
2160 return SSH_ERR_KEY_TYPE_UNKNOWN;
2161 }
2162}
2163
2164/* Converts a private to a public key */
2165int
2166sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2167{
2168 struct sshkey *pk;
2169 int ret = SSH_ERR_INTERNAL_ERROR;
2170
2171 if (dkp != NULL)
2172 *dkp = NULL;
2173
2174 if ((pk = calloc(1, sizeof(*pk))) == NULL)
2175 return SSH_ERR_ALLOC_FAIL;
2176 pk->type = k->type;
2177 pk->flags = k->flags;
2178 pk->ecdsa_nid = k->ecdsa_nid;
2179 pk->dsa = NULL;
2180 pk->ecdsa = NULL;
2181 pk->rsa = NULL;
2182 pk->ed25519_pk = NULL;
2183 pk->ed25519_sk = NULL;
2184
2185 switch (k->type) {
2186#ifdef WITH_OPENSSL
2187 case KEY_RSA_CERT_V00:
2188 case KEY_RSA_CERT:
2189 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2190 goto fail;
2191 /* FALLTHROUGH */
2192 case KEY_RSA1:
2193 case KEY_RSA:
2194 if ((pk->rsa = RSA_new()) == NULL ||
2195 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2196 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2197 ret = SSH_ERR_ALLOC_FAIL;
2198 goto fail;
2199 }
2200 break;
2201 case KEY_DSA_CERT_V00:
2202 case KEY_DSA_CERT:
2203 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2204 goto fail;
2205 /* FALLTHROUGH */
2206 case KEY_DSA:
2207 if ((pk->dsa = DSA_new()) == NULL ||
2208 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2209 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2210 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2211 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2212 ret = SSH_ERR_ALLOC_FAIL;
2213 goto fail;
2214 }
2215 break;
2216 case KEY_ECDSA_CERT:
2217 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2218 goto fail;
2219 /* FALLTHROUGH */
2220# ifdef OPENSSL_HAS_ECC
2221 case KEY_ECDSA:
2222 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2223 if (pk->ecdsa == NULL) {
2224 ret = SSH_ERR_ALLOC_FAIL;
2225 goto fail;
2226 }
2227 if (EC_KEY_set_public_key(pk->ecdsa,
2228 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2229 ret = SSH_ERR_LIBCRYPTO_ERROR;
2230 goto fail;
2231 }
2232 break;
2233# endif /* OPENSSL_HAS_ECC */
2234#endif /* WITH_OPENSSL */
2235 case KEY_ED25519_CERT:
2236 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2237 goto fail;
2238 /* FALLTHROUGH */
2239 case KEY_ED25519:
2240 if (k->ed25519_pk != NULL) {
2241 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2242 ret = SSH_ERR_ALLOC_FAIL;
2243 goto fail;
2244 }
2245 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2246 }
2247 break;
2248 default:
2249 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2250 fail:
2251 sshkey_free(pk);
2252 return ret;
2253 }
2254 *dkp = pk;
2255 return 0;
2256}
2257
2258/* Convert a plain key to their _CERT equivalent */
2259int
2260sshkey_to_certified(struct sshkey *k, int legacy)
2261{
2262 int newtype;
2263
2264 switch (k->type) {
2265#ifdef WITH_OPENSSL
2266 case KEY_RSA:
2267 newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
2268 break;
2269 case KEY_DSA:
2270 newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
2271 break;
2272 case KEY_ECDSA:
2273 if (legacy)
2274 return SSH_ERR_INVALID_ARGUMENT;
2275 newtype = KEY_ECDSA_CERT;
2276 break;
2277#endif /* WITH_OPENSSL */
2278 case KEY_ED25519:
2279 if (legacy)
2280 return SSH_ERR_INVALID_ARGUMENT;
2281 newtype = KEY_ED25519_CERT;
2282 break;
2283 default:
2284 return SSH_ERR_INVALID_ARGUMENT;
2285 }
2286 if ((k->cert = cert_new()) == NULL)
2287 return SSH_ERR_ALLOC_FAIL;
2288 k->type = newtype;
2289 return 0;
2290}
2291
2292/* Convert a certificate to its raw key equivalent */
2293int
2294sshkey_drop_cert(struct sshkey *k)
2295{
2296 if (!sshkey_type_is_cert(k->type))
2297 return SSH_ERR_KEY_TYPE_UNKNOWN;
2298 cert_free(k->cert);
2299 k->cert = NULL;
2300 k->type = sshkey_type_plain(k->type);
2301 return 0;
2302}
2303
2304/* Sign a certified key, (re-)generating the signed certblob. */
2305int
2306sshkey_certify(struct sshkey *k, struct sshkey *ca)
2307{
2308 struct sshbuf *principals = NULL;
2309 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2310 size_t i, ca_len, sig_len;
2311 int ret = SSH_ERR_INTERNAL_ERROR;
2312 struct sshbuf *cert;
2313
2314 if (k == NULL || k->cert == NULL ||
2315 k->cert->certblob == NULL || ca == NULL)
2316 return SSH_ERR_INVALID_ARGUMENT;
2317 if (!sshkey_is_cert(k))
2318 return SSH_ERR_KEY_TYPE_UNKNOWN;
2319 if (!sshkey_type_is_valid_ca(ca->type))
2320 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2321
2322 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2323 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2324
2325 cert = k->cert->certblob; /* for readability */
2326 sshbuf_reset(cert);
2327 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2328 goto out;
2329
2330 /* -v01 certs put nonce first */
2331 arc4random_buf(&nonce, sizeof(nonce));
2332 if (!sshkey_cert_is_legacy(k)) {
2333 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2334 goto out;
2335 }
2336
2337 /* XXX this substantially duplicates to_blob(); refactor */
2338 switch (k->type) {
2339#ifdef WITH_OPENSSL
2340 case KEY_DSA_CERT_V00:
2341 case KEY_DSA_CERT:
2342 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2343 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2344 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2345 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2346 goto out;
2347 break;
2348# ifdef OPENSSL_HAS_ECC
2349 case KEY_ECDSA_CERT:
2350 if ((ret = sshbuf_put_cstring(cert,
2351 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2352 (ret = sshbuf_put_ec(cert,
2353 EC_KEY_get0_public_key(k->ecdsa),
2354 EC_KEY_get0_group(k->ecdsa))) != 0)
2355 goto out;
2356 break;
2357# endif /* OPENSSL_HAS_ECC */
2358 case KEY_RSA_CERT_V00:
2359 case KEY_RSA_CERT:
2360 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2361 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2362 goto out;
2363 break;
2364#endif /* WITH_OPENSSL */
2365 case KEY_ED25519_CERT:
2366 if ((ret = sshbuf_put_string(cert,
2367 k->ed25519_pk, ED25519_PK_SZ)) != 0)
2368 goto out;
2369 break;
2370 default:
2371 ret = SSH_ERR_INVALID_ARGUMENT;
2372 }
2373
2374 /* -v01 certs have a serial number next */
2375 if (!sshkey_cert_is_legacy(k)) {
2376 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
2377 goto out;
2378 }
2379
2380 if ((ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2381 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2382 goto out;
2383
2384 if ((principals = sshbuf_new()) == NULL) {
2385 ret = SSH_ERR_ALLOC_FAIL;
2386 goto out;
2387 }
2388 for (i = 0; i < k->cert->nprincipals; i++) {
2389 if ((ret = sshbuf_put_cstring(principals,
2390 k->cert->principals[i])) != 0)
2391 goto out;
2392 }
2393 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2394 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2395 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2396 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0)
2397 goto out;
2398
2399 /* -v01 certs have non-critical options here */
2400 if (!sshkey_cert_is_legacy(k)) {
2401 if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
2402 goto out;
2403 }
2404
2405 /* -v00 certs put the nonce at the end */
2406 if (sshkey_cert_is_legacy(k)) {
2407 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2408 goto out;
2409 }
2410
2411 if ((ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2412 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2413 goto out;
2414
2415 /* Sign the whole mess */
2416 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2417 sshbuf_len(cert), 0)) != 0)
2418 goto out;
2419
2420 /* Append signature and we are done */
2421 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2422 goto out;
2423 ret = 0;
2424 out:
2425 if (ret != 0)
2426 sshbuf_reset(cert);
2427 if (sig_blob != NULL)
2428 free(sig_blob);
2429 if (ca_blob != NULL)
2430 free(ca_blob);
2431 if (principals != NULL)
2432 sshbuf_free(principals);
2433 return ret;
2434}
2435
2436int
2437sshkey_cert_check_authority(const struct sshkey *k,
2438 int want_host, int require_principal,
2439 const char *name, const char **reason)
2440{
2441 u_int i, principal_matches;
2442 time_t now = time(NULL);
2443
2444 if (reason != NULL)
2445 *reason = NULL;
2446
2447 if (want_host) {
2448 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2449 *reason = "Certificate invalid: not a host certificate";
2450 return SSH_ERR_KEY_CERT_INVALID;
2451 }
2452 } else {
2453 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2454 *reason = "Certificate invalid: not a user certificate";
2455 return SSH_ERR_KEY_CERT_INVALID;
2456 }
2457 }
2458 if (now < 0) {
2459 /* yikes - system clock before epoch! */
2460 *reason = "Certificate invalid: not yet valid";
2461 return SSH_ERR_KEY_CERT_INVALID;
2462 }
2463 if ((u_int64_t)now < k->cert->valid_after) {
2464 *reason = "Certificate invalid: not yet valid";
2465 return SSH_ERR_KEY_CERT_INVALID;
2466 }
2467 if ((u_int64_t)now >= k->cert->valid_before) {
2468 *reason = "Certificate invalid: expired";
2469 return SSH_ERR_KEY_CERT_INVALID;
2470 }
2471 if (k->cert->nprincipals == 0) {
2472 if (require_principal) {
2473 *reason = "Certificate lacks principal list";
2474 return SSH_ERR_KEY_CERT_INVALID;
2475 }
2476 } else if (name != NULL) {
2477 principal_matches = 0;
2478 for (i = 0; i < k->cert->nprincipals; i++) {
2479 if (strcmp(name, k->cert->principals[i]) == 0) {
2480 principal_matches = 1;
2481 break;
2482 }
2483 }
2484 if (!principal_matches) {
2485 *reason = "Certificate invalid: name is not a listed "
2486 "principal";
2487 return SSH_ERR_KEY_CERT_INVALID;
2488 }
2489 }
2490 return 0;
2491}
2492
2493int
2494sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2495{
2496 int r = SSH_ERR_INTERNAL_ERROR;
2497
2498 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2499 goto out;
2500 switch (key->type) {
2501#ifdef WITH_OPENSSL
2502 case KEY_RSA:
2503 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2504 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2505 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2506 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2507 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2508 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2509 goto out;
2510 break;
2511 case KEY_RSA_CERT_V00:
2512 case KEY_RSA_CERT:
2513 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2514 r = SSH_ERR_INVALID_ARGUMENT;
2515 goto out;
2516 }
2517 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2518 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2519 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2520 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2521 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2522 goto out;
2523 break;
2524 case KEY_DSA:
2525 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2526 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2527 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2528 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2529 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2530 goto out;
2531 break;
2532 case KEY_DSA_CERT_V00:
2533 case KEY_DSA_CERT:
2534 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2535 r = SSH_ERR_INVALID_ARGUMENT;
2536 goto out;
2537 }
2538 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2539 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2540 goto out;
2541 break;
2542# ifdef OPENSSL_HAS_ECC
2543 case KEY_ECDSA:
2544 if ((r = sshbuf_put_cstring(b,
2545 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2546 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2547 (r = sshbuf_put_bignum2(b,
2548 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2549 goto out;
2550 break;
2551 case KEY_ECDSA_CERT:
2552 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2553 r = SSH_ERR_INVALID_ARGUMENT;
2554 goto out;
2555 }
2556 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2557 (r = sshbuf_put_bignum2(b,
2558 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2559 goto out;
2560 break;
2561# endif /* OPENSSL_HAS_ECC */
2562#endif /* WITH_OPENSSL */
2563 case KEY_ED25519:
2564 if ((r = sshbuf_put_string(b, key->ed25519_pk,
2565 ED25519_PK_SZ)) != 0 ||
2566 (r = sshbuf_put_string(b, key->ed25519_sk,
2567 ED25519_SK_SZ)) != 0)
2568 goto out;
2569 break;
2570 case KEY_ED25519_CERT:
2571 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2572 r = SSH_ERR_INVALID_ARGUMENT;
2573 goto out;
2574 }
2575 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2576 (r = sshbuf_put_string(b, key->ed25519_pk,
2577 ED25519_PK_SZ)) != 0 ||
2578 (r = sshbuf_put_string(b, key->ed25519_sk,
2579 ED25519_SK_SZ)) != 0)
2580 goto out;
2581 break;
2582 default:
2583 r = SSH_ERR_INVALID_ARGUMENT;
2584 goto out;
2585 }
2586 /* success */
2587 r = 0;
2588 out:
2589 return r;
2590}
2591
2592int
2593sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2594{
2595 char *tname = NULL, *curve = NULL;
2596 struct sshkey *k = NULL;
2597 const u_char *cert;
2598 size_t len, pklen = 0, sklen = 0;
2599 int type, r = SSH_ERR_INTERNAL_ERROR;
2600 u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2601#ifdef WITH_OPENSSL
2602 BIGNUM *exponent = NULL;
2603#endif /* WITH_OPENSSL */
2604
2605 if (kp != NULL)
2606 *kp = NULL;
2607 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2608 goto out;
2609 type = sshkey_type_from_name(tname);
2610 switch (type) {
2611#ifdef WITH_OPENSSL
2612 case KEY_DSA:
2613 if ((k = sshkey_new_private(type)) == NULL) {
2614 r = SSH_ERR_ALLOC_FAIL;
2615 goto out;
2616 }
2617 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2618 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2619 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2620 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2621 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2622 goto out;
2623 break;
2624 case KEY_DSA_CERT_V00:
2625 case KEY_DSA_CERT:
2626 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2627 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2628 (r = sshkey_add_private(k)) != 0 ||
2629 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2630 goto out;
2631 break;
2632# ifdef OPENSSL_HAS_ECC
2633 case KEY_ECDSA:
2634 if ((k = sshkey_new_private(type)) == NULL) {
2635 r = SSH_ERR_ALLOC_FAIL;
2636 goto out;
2637 }
2638 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2639 r = SSH_ERR_INVALID_ARGUMENT;
2640 goto out;
2641 }
2642 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2643 goto out;
2644 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2645 r = SSH_ERR_EC_CURVE_MISMATCH;
2646 goto out;
2647 }
2648 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2649 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2650 r = SSH_ERR_LIBCRYPTO_ERROR;
2651 goto out;
2652 }
2653 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2654 (r = sshbuf_get_bignum2(buf, exponent)))
2655 goto out;
2656 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2657 r = SSH_ERR_LIBCRYPTO_ERROR;
2658 goto out;
2659 }
2660 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2661 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2662 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2663 goto out;
2664 break;
2665 case KEY_ECDSA_CERT:
2666 if ((exponent = BN_new()) == NULL) {
2667 r = SSH_ERR_LIBCRYPTO_ERROR;
2668 goto out;
2669 }
2670 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2671 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2672 (r = sshkey_add_private(k)) != 0 ||
2673 (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2674 goto out;
2675 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2676 r = SSH_ERR_LIBCRYPTO_ERROR;
2677 goto out;
2678 }
2679 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2680 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2681 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2682 goto out;
2683 break;
2684# endif /* OPENSSL_HAS_ECC */
2685 case KEY_RSA:
2686 if ((k = sshkey_new_private(type)) == NULL) {
2687 r = SSH_ERR_ALLOC_FAIL;
2688 goto out;
2689 }
2690 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2691 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2692 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2693 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2694 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2695 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2696 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2697 goto out;
2698 break;
2699 case KEY_RSA_CERT_V00:
2700 case KEY_RSA_CERT:
2701 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2702 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2703 (r = sshkey_add_private(k)) != 0 ||
2704 (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2705 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2706 (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2707 (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2708 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2709 goto out;
2710 break;
2711#endif /* WITH_OPENSSL */
2712 case KEY_ED25519:
2713 if ((k = sshkey_new_private(type)) == NULL) {
2714 r = SSH_ERR_ALLOC_FAIL;
2715 goto out;
2716 }
2717 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2718 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2719 goto out;
2720 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2721 r = SSH_ERR_INVALID_FORMAT;
2722 goto out;
2723 }
2724 k->ed25519_pk = ed25519_pk;
2725 k->ed25519_sk = ed25519_sk;
2726 ed25519_pk = ed25519_sk = NULL;
2727 break;
2728 case KEY_ED25519_CERT:
2729 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2730 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2731 (r = sshkey_add_private(k)) != 0 ||
2732 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2733 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2734 goto out;
2735 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2736 r = SSH_ERR_INVALID_FORMAT;
2737 goto out;
2738 }
2739 k->ed25519_pk = ed25519_pk;
2740 k->ed25519_sk = ed25519_sk;
2741 ed25519_pk = ed25519_sk = NULL;
2742 break;
2743 default:
2744 r = SSH_ERR_KEY_TYPE_UNKNOWN;
2745 goto out;
2746 }
2747#ifdef WITH_OPENSSL
2748 /* enable blinding */
2749 switch (k->type) {
2750 case KEY_RSA:
2751 case KEY_RSA_CERT_V00:
2752 case KEY_RSA_CERT:
2753 case KEY_RSA1:
2754 if (RSA_blinding_on(k->rsa, NULL) != 1) {
2755 r = SSH_ERR_LIBCRYPTO_ERROR;
2756 goto out;
2757 }
2758 break;
2759 }
2760#endif /* WITH_OPENSSL */
2761 /* success */
2762 r = 0;
2763 if (kp != NULL) {
2764 *kp = k;
2765 k = NULL;
2766 }
2767 out:
2768 free(tname);
2769 free(curve);
2770#ifdef WITH_OPENSSL
2771 if (exponent != NULL)
2772 BN_clear_free(exponent);
2773#endif /* WITH_OPENSSL */
2774 sshkey_free(k);
2775 if (ed25519_pk != NULL) {
2776 explicit_bzero(ed25519_pk, pklen);
2777 free(ed25519_pk);
2778 }
2779 if (ed25519_sk != NULL) {
2780 explicit_bzero(ed25519_sk, sklen);
2781 free(ed25519_sk);
2782 }
2783 return r;
2784}
2785
2786#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2787int
2788sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2789{
2790 BN_CTX *bnctx;
2791 EC_POINT *nq = NULL;
2792 BIGNUM *order, *x, *y, *tmp;
2793 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2794
2795 if ((bnctx = BN_CTX_new()) == NULL)
2796 return SSH_ERR_ALLOC_FAIL;
2797 BN_CTX_start(bnctx);
2798
2799 /*
2800 * We shouldn't ever hit this case because bignum_get_ecpoint()
2801 * refuses to load GF2m points.
2802 */
2803 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2804 NID_X9_62_prime_field)
2805 goto out;
2806
2807 /* Q != infinity */
2808 if (EC_POINT_is_at_infinity(group, public))
2809 goto out;
2810
2811 if ((x = BN_CTX_get(bnctx)) == NULL ||
2812 (y = BN_CTX_get(bnctx)) == NULL ||
2813 (order = BN_CTX_get(bnctx)) == NULL ||
2814 (tmp = BN_CTX_get(bnctx)) == NULL) {
2815 ret = SSH_ERR_ALLOC_FAIL;
2816 goto out;
2817 }
2818
2819 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2820 if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2821 EC_POINT_get_affine_coordinates_GFp(group, public,
2822 x, y, bnctx) != 1) {
2823 ret = SSH_ERR_LIBCRYPTO_ERROR;
2824 goto out;
2825 }
2826 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2827 BN_num_bits(y) <= BN_num_bits(order) / 2)
2828 goto out;
2829
2830 /* nQ == infinity (n == order of subgroup) */
2831 if ((nq = EC_POINT_new(group)) == NULL) {
2832 ret = SSH_ERR_ALLOC_FAIL;
2833 goto out;
2834 }
2835 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2836 ret = SSH_ERR_LIBCRYPTO_ERROR;
2837 goto out;
2838 }
2839 if (EC_POINT_is_at_infinity(group, nq) != 1)
2840 goto out;
2841
2842 /* x < order - 1, y < order - 1 */
2843 if (!BN_sub(tmp, order, BN_value_one())) {
2844 ret = SSH_ERR_LIBCRYPTO_ERROR;
2845 goto out;
2846 }
2847 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2848 goto out;
2849 ret = 0;
2850 out:
2851 BN_CTX_free(bnctx);
2852 if (nq != NULL)
2853 EC_POINT_free(nq);
2854 return ret;
2855}
2856
2857int
2858sshkey_ec_validate_private(const EC_KEY *key)
2859{
2860 BN_CTX *bnctx;
2861 BIGNUM *order, *tmp;
2862 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2863
2864 if ((bnctx = BN_CTX_new()) == NULL)
2865 return SSH_ERR_ALLOC_FAIL;
2866 BN_CTX_start(bnctx);
2867
2868 if ((order = BN_CTX_get(bnctx)) == NULL ||
2869 (tmp = BN_CTX_get(bnctx)) == NULL) {
2870 ret = SSH_ERR_ALLOC_FAIL;
2871 goto out;
2872 }
2873
2874 /* log2(private) > log2(order)/2 */
2875 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2876 ret = SSH_ERR_LIBCRYPTO_ERROR;
2877 goto out;
2878 }
2879 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2880 BN_num_bits(order) / 2)
2881 goto out;
2882
2883 /* private < order - 1 */
2884 if (!BN_sub(tmp, order, BN_value_one())) {
2885 ret = SSH_ERR_LIBCRYPTO_ERROR;
2886 goto out;
2887 }
2888 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2889 goto out;
2890 ret = 0;
2891 out:
2892 BN_CTX_free(bnctx);
2893 return ret;
2894}
2895
2896void
2897sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2898{
2899 BIGNUM *x, *y;
2900 BN_CTX *bnctx;
2901
2902 if (point == NULL) {
2903 fputs("point=(NULL)\n", stderr);
2904 return;
2905 }
2906 if ((bnctx = BN_CTX_new()) == NULL) {
2907 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2908 return;
2909 }
2910 BN_CTX_start(bnctx);
2911 if ((x = BN_CTX_get(bnctx)) == NULL ||
2912 (y = BN_CTX_get(bnctx)) == NULL) {
2913 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2914 return;
2915 }
2916 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2917 NID_X9_62_prime_field) {
2918 fprintf(stderr, "%s: group is not a prime field\n", __func__);
2919 return;
2920 }
2921 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2922 bnctx) != 1) {
2923 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2924 __func__);
2925 return;
2926 }
2927 fputs("x=", stderr);
2928 BN_print_fp(stderr, x);
2929 fputs("\ny=", stderr);
2930 BN_print_fp(stderr, y);
2931 fputs("\n", stderr);
2932 BN_CTX_free(bnctx);
2933}
2934
2935void
2936sshkey_dump_ec_key(const EC_KEY *key)
2937{
2938 const BIGNUM *exponent;
2939
2940 sshkey_dump_ec_point(EC_KEY_get0_group(key),
2941 EC_KEY_get0_public_key(key));
2942 fputs("exponent=", stderr);
2943 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2944 fputs("(NULL)", stderr);
2945 else
2946 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2947 fputs("\n", stderr);
2948}
2949#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2950
2951static int
2952sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2953 const char *passphrase, const char *comment, const char *ciphername,
2954 int rounds)
2955{
2956 u_char *cp, *b64 = NULL, *key = NULL, *pubkeyblob = NULL;
2957 u_char salt[SALT_LEN];
2958 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2959 u_int check;
2960 int r = SSH_ERR_INTERNAL_ERROR;
2961 struct sshcipher_ctx ciphercontext;
2962 const struct sshcipher *cipher;
2963 const char *kdfname = KDFNAME;
2964 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2965
2966 memset(&ciphercontext, 0, sizeof(ciphercontext));
2967
2968 if (rounds <= 0)
2969 rounds = DEFAULT_ROUNDS;
2970 if (passphrase == NULL || !strlen(passphrase)) {
2971 ciphername = "none";
2972 kdfname = "none";
2973 } else if (ciphername == NULL)
2974 ciphername = DEFAULT_CIPHERNAME;
2975 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2976 r = SSH_ERR_INVALID_ARGUMENT;
2977 goto out;
2978 }
2979 if ((cipher = cipher_by_name(ciphername)) == NULL) {
2980 r = SSH_ERR_INTERNAL_ERROR;
2981 goto out;
2982 }
2983
2984 if ((kdf = sshbuf_new()) == NULL ||
2985 (encoded = sshbuf_new()) == NULL ||
2986 (encrypted = sshbuf_new()) == NULL) {
2987 r = SSH_ERR_ALLOC_FAIL;
2988 goto out;
2989 }
2990 blocksize = cipher_blocksize(cipher);
2991 keylen = cipher_keylen(cipher);
2992 ivlen = cipher_ivlen(cipher);
2993 authlen = cipher_authlen(cipher);
2994 if ((key = calloc(1, keylen + ivlen)) == NULL) {
2995 r = SSH_ERR_ALLOC_FAIL;
2996 goto out;
2997 }
2998 if (strcmp(kdfname, "bcrypt") == 0) {
2999 arc4random_buf(salt, SALT_LEN);
3000 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3001 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3002 r = SSH_ERR_INVALID_ARGUMENT;
3003 goto out;
3004 }
3005 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3006 (r = sshbuf_put_u32(kdf, rounds)) != 0)
3007 goto out;
3008 } else if (strcmp(kdfname, "none") != 0) {
3009 /* Unsupported KDF type */
3010 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3011 goto out;
3012 }
3013 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3014 key + keylen, ivlen, 1)) != 0)
3015 goto out;
3016
3017 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3018 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3019 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3020 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3021 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3022 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3023 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3024 goto out;
3025
3026 /* set up the buffer that will be encrypted */
3027
3028 /* Random check bytes */
3029 check = arc4random();
3030 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3031 (r = sshbuf_put_u32(encrypted, check)) != 0)
3032 goto out;
3033
3034 /* append private key and comment*/
3035 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3036 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3037 goto out;
3038
3039 /* padding */
3040 i = 0;
3041 while (sshbuf_len(encrypted) % blocksize) {
3042 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3043 goto out;
3044 }
3045
3046 /* length in destination buffer */
3047 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3048 goto out;
3049
3050 /* encrypt */
3051 if ((r = sshbuf_reserve(encoded,
3052 sshbuf_len(encrypted) + authlen, &cp)) != 0)
3053 goto out;
3054 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3055 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3056 goto out;
3057
3058 /* uuencode */
3059 if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3060 r = SSH_ERR_ALLOC_FAIL;
3061 goto out;
3062 }
3063
3064 sshbuf_reset(blob);
3065 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3066 goto out;
3067 for (i = 0; i < strlen(b64); i++) {
3068 if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3069 goto out;
3070 /* insert line breaks */
3071 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3072 goto out;
3073 }
3074 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3075 goto out;
3076 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3077 goto out;
3078
3079 /* success */
3080 r = 0;
3081
3082 out:
3083 sshbuf_free(kdf);
3084 sshbuf_free(encoded);
3085 sshbuf_free(encrypted);
3086 cipher_cleanup(&ciphercontext);
3087 explicit_bzero(salt, sizeof(salt));
3088 if (key != NULL) {
3089 explicit_bzero(key, keylen + ivlen);
3090 free(key);
3091 }
3092 if (pubkeyblob != NULL) {
3093 explicit_bzero(pubkeyblob, pubkeylen);
3094 free(pubkeyblob);
3095 }
3096 if (b64 != NULL) {
3097 explicit_bzero(b64, strlen(b64));
3098 free(b64);
3099 }
3100 return r;
3101}
3102
3103static int
3104sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3105 struct sshkey **keyp, char **commentp)
3106{
3107 char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3108 const struct sshcipher *cipher = NULL;
3109 const u_char *cp;
3110 int r = SSH_ERR_INTERNAL_ERROR;
3111 size_t encoded_len;
3112 size_t i, keylen = 0, ivlen = 0, slen = 0;
3113 struct sshbuf *encoded = NULL, *decoded = NULL;
3114 struct sshbuf *kdf = NULL, *decrypted = NULL;
3115 struct sshcipher_ctx ciphercontext;
3116 struct sshkey *k = NULL;
3117 u_char *key = NULL, *salt = NULL, *dp, pad, last;
3118 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3119
3120 memset(&ciphercontext, 0, sizeof(ciphercontext));
3121 if (keyp != NULL)
3122 *keyp = NULL;
3123 if (commentp != NULL)
3124 *commentp = NULL;
3125
3126 if ((encoded = sshbuf_new()) == NULL ||
3127 (decoded = sshbuf_new()) == NULL ||
3128 (decrypted = sshbuf_new()) == NULL) {
3129 r = SSH_ERR_ALLOC_FAIL;
3130 goto out;
3131 }
3132
3133 /* check preamble */
3134 cp = sshbuf_ptr(blob);
3135 encoded_len = sshbuf_len(blob);
3136 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3137 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3138 r = SSH_ERR_INVALID_FORMAT;
3139 goto out;
3140 }
3141 cp += MARK_BEGIN_LEN;
3142 encoded_len -= MARK_BEGIN_LEN;
3143
3144 /* Look for end marker, removing whitespace as we go */
3145 while (encoded_len > 0) {
3146 if (*cp != '\n' && *cp != '\r') {
3147 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3148 goto out;
3149 }
3150 last = *cp;
3151 encoded_len--;
3152 cp++;
3153 if (last == '\n') {
3154 if (encoded_len >= MARK_END_LEN &&
3155 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3156 /* \0 terminate */
3157 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3158 goto out;
3159 break;
3160 }
3161 }
3162 }
3163 if (encoded_len == 0) {
3164 r = SSH_ERR_INVALID_FORMAT;
3165 goto out;
3166 }
3167
3168 /* decode base64 */
3169 if ((r = sshbuf_b64tod(decoded, sshbuf_ptr(encoded))) != 0)
3170 goto out;
3171
3172 /* check magic */
3173 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3174 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3175 r = SSH_ERR_INVALID_FORMAT;
3176 goto out;
3177 }
3178 /* parse public portion of key */
3179 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3180 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3181 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3182 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3183 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3184 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3185 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3186 goto out;
3187
3188 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3189 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3190 goto out;
3191 }
3192 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3193 strcmp(ciphername, "none") != 0) {
3194 /* passphrase required */
3195 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3196 goto out;
3197 }
3198 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3199 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3200 goto out;
3201 }
3202 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3203 r = SSH_ERR_INVALID_FORMAT;
3204 goto out;
3205 }
3206 if (nkeys != 1) {
3207 /* XXX only one key supported */
3208 r = SSH_ERR_INVALID_FORMAT;
3209 goto out;
3210 }
3211
3212 /* check size of encrypted key blob */
3213 blocksize = cipher_blocksize(cipher);
3214 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3215 r = SSH_ERR_INVALID_FORMAT;
3216 goto out;
3217 }
3218
3219 /* setup key */
3220 keylen = cipher_keylen(cipher);
3221 ivlen = cipher_ivlen(cipher);
3222 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3223 r = SSH_ERR_ALLOC_FAIL;
3224 goto out;
3225 }
3226 if (strcmp(kdfname, "bcrypt") == 0) {
3227 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3228 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3229 goto out;
3230 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3231 key, keylen + ivlen, rounds) < 0) {
3232 r = SSH_ERR_INVALID_FORMAT;
3233 goto out;
3234 }
3235 }
3236
3237 /* decrypt private portion of key */
3238 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3239 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3240 key + keylen, ivlen, 0)) != 0)
3241 goto out;
3242 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3243 sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 0) {
3244 /* an integrity error here indicates an incorrect passphrase */
3245 if (r == SSH_ERR_MAC_INVALID)
3246 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3247 goto out;
3248 }
3249 if ((r = sshbuf_consume(decoded, encrypted_len)) != 0)
3250 goto out;
3251 /* there should be no trailing data */
3252 if (sshbuf_len(decoded) != 0) {
3253 r = SSH_ERR_INVALID_FORMAT;
3254 goto out;
3255 }
3256
3257 /* check check bytes */
3258 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3259 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3260 goto out;
3261 if (check1 != check2) {
3262 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3263 goto out;
3264 }
3265
3266 /* Load the private key and comment */
3267 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3268 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3269 goto out;
3270
3271 /* Check deterministic padding */
3272 i = 0;
3273 while (sshbuf_len(decrypted)) {
3274 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3275 goto out;
3276 if (pad != (++i & 0xff)) {
3277 r = SSH_ERR_INVALID_FORMAT;
3278 goto out;
3279 }
3280 }
3281
3282 /* XXX decode pubkey and check against private */
3283
3284 /* success */
3285 r = 0;
3286 if (keyp != NULL) {
3287 *keyp = k;
3288 k = NULL;
3289 }
3290 if (commentp != NULL) {
3291 *commentp = comment;
3292 comment = NULL;
3293 }
3294 out:
3295 pad = 0;
3296 cipher_cleanup(&ciphercontext);
3297 free(ciphername);
3298 free(kdfname);
3299 free(comment);
3300 if (salt != NULL) {
3301 explicit_bzero(salt, slen);
3302 free(salt);
3303 }
3304 if (key != NULL) {
3305 explicit_bzero(key, keylen + ivlen);
3306 free(key);
3307 }
3308 sshbuf_free(encoded);
3309 sshbuf_free(decoded);
3310 sshbuf_free(kdf);
3311 sshbuf_free(decrypted);
3312 sshkey_free(k);
3313 return r;
3314}
3315
3316#if WITH_SSH1
3317/*
3318 * Serialises the authentication (private) key to a blob, encrypting it with
3319 * passphrase. The identification of the blob (lowest 64 bits of n) will
3320 * precede the key to provide identification of the key without needing a
3321 * passphrase.
3322 */
3323static int
3324sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3325 const char *passphrase, const char *comment)
3326{
3327 struct sshbuf *buffer = NULL, *encrypted = NULL;
3328 u_char buf[8];
3329 int r, cipher_num;
3330 struct sshcipher_ctx ciphercontext;
3331 const struct sshcipher *cipher;
3332 u_char *cp;
3333
3334 /*
3335 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3336 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3337 */
3338 cipher_num = (strcmp(passphrase, "") == 0) ?
3339 SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3340 if ((cipher = cipher_by_number(cipher_num)) == NULL)
3341 return SSH_ERR_INTERNAL_ERROR;
3342
3343 /* This buffer is used to build the secret part of the private key. */
3344 if ((buffer = sshbuf_new()) == NULL)
3345 return SSH_ERR_ALLOC_FAIL;
3346
3347 /* Put checkbytes for checking passphrase validity. */
3348 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3349 goto out;
3350 arc4random_buf(cp, 2);
3351 memcpy(cp + 2, cp, 2);
3352
3353 /*
3354 * Store the private key (n and e will not be stored because they
3355 * will be stored in plain text, and storing them also in encrypted
3356 * format would just give known plaintext).
3357 * Note: q and p are stored in reverse order to SSL.
3358 */
3359 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3360 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3361 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3362 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3363 goto out;
3364
3365 /* Pad the part to be encrypted to a size that is a multiple of 8. */
3366 explicit_bzero(buf, 8);
3367 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3368 goto out;
3369
3370 /* This buffer will be used to contain the data in the file. */
3371 if ((encrypted = sshbuf_new()) == NULL) {
3372 r = SSH_ERR_ALLOC_FAIL;
3373 goto out;
3374 }
3375
3376 /* First store keyfile id string. */
3377 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3378 sizeof(LEGACY_BEGIN))) != 0)
3379 goto out;
3380
3381 /* Store cipher type and "reserved" field. */
3382 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3383 (r = sshbuf_put_u32(encrypted, 0)) != 0)
3384 goto out;
3385
3386 /* Store public key. This will be in plain text. */
3387 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3388 (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3389 (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3390 (r = sshbuf_put_cstring(encrypted, comment) != 0))
3391 goto out;
3392
3393 /* Allocate space for the private part of the key in the buffer. */
3394 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3395 goto out;
3396
3397 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3398 CIPHER_ENCRYPT)) != 0)
3399 goto out;
3400 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3401 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3402 goto out;
3403 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3404 goto out;
3405
3406 r = sshbuf_putb(blob, encrypted);
3407
3408 out:
3409 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3410 explicit_bzero(buf, sizeof(buf));
3411 if (buffer != NULL)
3412 sshbuf_free(buffer);
3413 if (encrypted != NULL)
3414 sshbuf_free(encrypted);
3415
3416 return r;
3417}
3418#endif /* WITH_SSH1 */
3419
3420#ifdef WITH_OPENSSL
3421/* convert SSH v2 key in OpenSSL PEM format */
3422static int
3423sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3424 const char *_passphrase, const char *comment)
3425{
3426 int success, r;
3427 int blen, len = strlen(_passphrase);
3428 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3429#if (OPENSSL_VERSION_NUMBER < 0x00907000L)
3430 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
3431#else
3432 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3433#endif
3434 const u_char *bptr;
3435 BIO *bio = NULL;
3436
3437 if (len > 0 && len <= 4)
3438 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3439 if ((bio = BIO_new(BIO_s_mem())) == NULL)
3440 return SSH_ERR_ALLOC_FAIL;
3441
3442 switch (key->type) {
3443 case KEY_DSA:
3444 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3445 cipher, passphrase, len, NULL, NULL);
3446 break;
3447#ifdef OPENSSL_HAS_ECC
3448 case KEY_ECDSA:
3449 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3450 cipher, passphrase, len, NULL, NULL);
3451 break;
3452#endif
3453 case KEY_RSA:
3454 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3455 cipher, passphrase, len, NULL, NULL);
3456 break;
3457 default:
3458 success = 0;
3459 break;
3460 }
3461 if (success == 0) {
3462 r = SSH_ERR_LIBCRYPTO_ERROR;
3463 goto out;
3464 }
3465 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3466 r = SSH_ERR_INTERNAL_ERROR;
3467 goto out;
3468 }
3469 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3470 goto out;
3471 r = 0;
3472 out:
3473 BIO_free(bio);
3474 return r;
3475}
3476#endif /* WITH_OPENSSL */
3477
3478/* Serialise "key" to buffer "blob" */
3479int
3480sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3481 const char *passphrase, const char *comment,
3482 int force_new_format, const char *new_format_cipher, int new_format_rounds)
3483{
3484 switch (key->type) {
3485#ifdef WITH_OPENSSL
3486 case KEY_RSA1:
3487 return sshkey_private_rsa1_to_blob(key, blob,
3488 passphrase, comment);
3489 case KEY_DSA:
3490 case KEY_ECDSA:
3491 case KEY_RSA:
3492 if (force_new_format) {
3493 return sshkey_private_to_blob2(key, blob, passphrase,
3494 comment, new_format_cipher, new_format_rounds);
3495 }
3496 return sshkey_private_pem_to_blob(key, blob,
3497 passphrase, comment);
3498#endif /* WITH_OPENSSL */
3499 case KEY_ED25519:
3500 return sshkey_private_to_blob2(key, blob, passphrase,
3501 comment, new_format_cipher, new_format_rounds);
3502 default:
3503 return SSH_ERR_KEY_TYPE_UNKNOWN;
3504 }
3505}
3506
3507#ifdef WITH_SSH1
3508/*
3509 * Parse the public, unencrypted portion of a RSA1 key.
3510 */
3511int
3512sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3513 struct sshkey **keyp, char **commentp)
3514{
3515 int r;
3516 struct sshkey *pub = NULL;
3517 struct sshbuf *copy = NULL;
3518
3519 if (keyp != NULL)
3520 *keyp = NULL;
3521 if (commentp != NULL)
3522 *commentp = NULL;
3523
3524 /* Check that it is at least big enough to contain the ID string. */
3525 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3526 return SSH_ERR_INVALID_FORMAT;
3527
3528 /*
3529 * Make sure it begins with the id string. Consume the id string
3530 * from the buffer.
3531 */
3532 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3533 return SSH_ERR_INVALID_FORMAT;
3534 /* Make a working copy of the keyblob and skip past the magic */
3535 if ((copy = sshbuf_fromb(blob)) == NULL)
3536 return SSH_ERR_ALLOC_FAIL;
3537 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3538 goto out;
3539
3540 /* Skip cipher type, reserved data and key bits. */
3541 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3542 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3543 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3544 goto out;
3545
3546 /* Read the public key from the buffer. */
3547 if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3548 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3549 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3550 goto out;
3551
3552 /* Finally, the comment */
3553 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3554 goto out;
3555
3556 /* The encrypted private part is not parsed by this function. */
3557
3558 r = 0;
3559 if (keyp != NULL)
3560 *keyp = pub;
3561 else
3562 sshkey_free(pub);
3563 pub = NULL;
3564
3565 out:
3566 if (copy != NULL)
3567 sshbuf_free(copy);
3568 if (pub != NULL)
3569 sshkey_free(pub);
3570 return r;
3571}
3572
3573static int
3574sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3575 struct sshkey **keyp, char **commentp)
3576{
3577 int r;
3578 u_int16_t check1, check2;
3579 u_int8_t cipher_type;
3580 struct sshbuf *decrypted = NULL, *copy = NULL;
3581 u_char *cp;
3582 char *comment = NULL;
3583 struct sshcipher_ctx ciphercontext;
3584 const struct sshcipher *cipher;
3585 struct sshkey *prv = NULL;
3586
3587 *keyp = NULL;
3588 if (commentp != NULL)
3589 *commentp = NULL;
3590
3591 /* Check that it is at least big enough to contain the ID string. */
3592 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3593 return SSH_ERR_INVALID_FORMAT;
3594
3595 /*
3596 * Make sure it begins with the id string. Consume the id string
3597 * from the buffer.
3598 */
3599 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3600 return SSH_ERR_INVALID_FORMAT;
3601
3602 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3603 r = SSH_ERR_ALLOC_FAIL;
3604 goto out;
3605 }
3606 if ((copy = sshbuf_fromb(blob)) == NULL ||
3607 (decrypted = sshbuf_new()) == NULL) {
3608 r = SSH_ERR_ALLOC_FAIL;
3609 goto out;
3610 }
3611 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3612 goto out;
3613
3614 /* Read cipher type. */
3615 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3616 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3617 goto out;
3618
3619 /* Read the public key and comment from the buffer. */
3620 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3621 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3622 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3623 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3624 goto out;
3625
3626 /* Check that it is a supported cipher. */
3627 cipher = cipher_by_number(cipher_type);
3628 if (cipher == NULL) {
3629 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3630 goto out;
3631 }
3632 /* Initialize space for decrypted data. */
3633 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3634 goto out;
3635
3636 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3637 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3638 CIPHER_DECRYPT)) != 0)
3639 goto out;
3640 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3641 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3642 cipher_cleanup(&ciphercontext);
3643 goto out;
3644 }
3645 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3646 goto out;
3647
3648 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3649 (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3650 goto out;
3651 if (check1 != check2) {
3652 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3653 goto out;
3654 }
3655
3656 /* Read the rest of the private key. */
3657 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3658 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3659 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3660 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3661 goto out;
3662
3663 /* calculate p-1 and q-1 */
3664 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3665 goto out;
3666
3667 /* enable blinding */
3668 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3669 r = SSH_ERR_LIBCRYPTO_ERROR;
3670 goto out;
3671 }
3672 r = 0;
3673 *keyp = prv;
3674 prv = NULL;
3675 if (commentp != NULL) {
3676 *commentp = comment;
3677 comment = NULL;
3678 }
3679 out:
3680 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3681 if (comment != NULL)
3682 free(comment);
3683 if (prv != NULL)
3684 sshkey_free(prv);
3685 if (copy != NULL)
3686 sshbuf_free(copy);
3687 if (decrypted != NULL)
3688 sshbuf_free(decrypted);
3689 return r;
3690}
3691#endif /* WITH_SSH1 */
3692
3693#ifdef WITH_OPENSSL
3694/* XXX make private once ssh-keysign.c fixed */
3695int
3696sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3697 const char *passphrase, struct sshkey **keyp, char **commentp)
3698{
3699 EVP_PKEY *pk = NULL;
3700 struct sshkey *prv = NULL;
3701 char *name = "<no key>";
3702 BIO *bio = NULL;
3703 int r;
3704
3705 *keyp = NULL;
3706 if (commentp != NULL)
3707 *commentp = NULL;
3708
3709 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3710 return SSH_ERR_ALLOC_FAIL;
3711 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3712 (int)sshbuf_len(blob)) {
3713 r = SSH_ERR_ALLOC_FAIL;
3714 goto out;
3715 }
3716
3717 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3718 (char *)passphrase)) == NULL) {
3719 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3720 goto out;
3721 }
3722 if (pk->type == EVP_PKEY_RSA &&
3723 (type == KEY_UNSPEC || type == KEY_RSA)) {
3724 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3725 r = SSH_ERR_ALLOC_FAIL;
3726 goto out;
3727 }
3728 prv->rsa = EVP_PKEY_get1_RSA(pk);
3729 prv->type = KEY_RSA;
3730 name = "rsa w/o comment";
3731#ifdef DEBUG_PK
3732 RSA_print_fp(stderr, prv->rsa, 8);
3733#endif
3734 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3735 r = SSH_ERR_LIBCRYPTO_ERROR;
3736 goto out;
3737 }
3738 } else if (pk->type == EVP_PKEY_DSA &&
3739 (type == KEY_UNSPEC || type == KEY_DSA)) {
3740 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3741 r = SSH_ERR_ALLOC_FAIL;
3742 goto out;
3743 }
3744 prv->dsa = EVP_PKEY_get1_DSA(pk);
3745 prv->type = KEY_DSA;
3746 name = "dsa w/o comment";
3747#ifdef DEBUG_PK
3748 DSA_print_fp(stderr, prv->dsa, 8);
3749#endif
3750#ifdef OPENSSL_HAS_ECC
3751 } else if (pk->type == EVP_PKEY_EC &&
3752 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3753 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3754 r = SSH_ERR_ALLOC_FAIL;
3755 goto out;
3756 }
3757 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3758 prv->type = KEY_ECDSA;
3759 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3760 if (prv->ecdsa_nid == -1 ||
3761 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3762 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3763 EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3764 sshkey_ec_validate_private(prv->ecdsa) != 0) {
3765 r = SSH_ERR_INVALID_FORMAT;
3766 goto out;
3767 }
3768 name = "ecdsa w/o comment";
3769# ifdef DEBUG_PK
3770 if (prv != NULL && prv->ecdsa != NULL)
3771 sshkey_dump_ec_key(prv->ecdsa);
3772# endif
3773#endif /* OPENSSL_HAS_ECC */
3774 } else {
3775 r = SSH_ERR_INVALID_FORMAT;
3776 goto out;
3777 }
3778 if (commentp != NULL &&
3779 (*commentp = strdup(name)) == NULL) {
3780 r = SSH_ERR_ALLOC_FAIL;
3781 goto out;
3782 }
3783 r = 0;
3784 *keyp = prv;
3785 prv = NULL;
3786 out:
3787 BIO_free(bio);
3788 if (pk != NULL)
3789 EVP_PKEY_free(pk);
3790 if (prv != NULL)
3791 sshkey_free(prv);
3792 return r;
3793}
3794#endif /* WITH_OPENSSL */
3795
3796int
3797sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3798 const char *passphrase, struct sshkey **keyp, char **commentp)
3799{
3800 int r;
3801
3802 *keyp = NULL;
3803 if (commentp != NULL)
3804 *commentp = NULL;
3805
3806 switch (type) {
3807#ifdef WITH_OPENSSL
3808 case KEY_RSA1:
3809 return sshkey_parse_private_rsa1(blob, passphrase,
3810 keyp, commentp);
3811 case KEY_DSA:
3812 case KEY_ECDSA:
3813 case KEY_RSA:
3814 return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3815 keyp, commentp);
3816#endif /* WITH_OPENSSL */
3817 case KEY_ED25519:
3818 return sshkey_parse_private2(blob, type, passphrase,
3819 keyp, commentp);
3820 case KEY_UNSPEC:
3821 if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3822 commentp)) == 0)
3823 return 0;
3824#ifdef WITH_OPENSSL
3825 return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3826 keyp, commentp);
3827#else
3828 return SSH_ERR_INVALID_FORMAT;
3829#endif /* WITH_OPENSSL */
3830 default:
3831 return SSH_ERR_KEY_TYPE_UNKNOWN;
3832 }
3833}
3834
3835int
3836sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3837 const char *filename, struct sshkey **keyp, char **commentp)
3838{
3839 int r;
3840
3841 if (keyp != NULL)
3842 *keyp = NULL;
3843 if (commentp != NULL)
3844 *commentp = NULL;
3845
3846#ifdef WITH_SSH1
3847 /* it's a SSH v1 key if the public key part is readable */
3848 if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3849 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3850 passphrase, keyp, commentp);
3851 }
3852#endif /* WITH_SSH1 */
3853 if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3854 passphrase, keyp, commentp)) == 0)
3855 return 0;
3856 return r;
3857}
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-30 12:28:05 +0000