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djm@openbsd.org3f4ea3c2015-04-03 22:17:27 +00001/* $OpenBSD: sshkey.c,v 1.16 2015/04/03 22:17:27 djm Exp $ */
Damien Miller86687062014-07-02 15:28:02 +10002/*
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
deraadt@openbsd.org2ae4f332015-01-16 06:40:12 +000030#include <sys/param.h> /* MIN MAX */
Damien Miller86687062014-07-02 15:28:02 +100031#include <sys/types.h>
djm@openbsd.org56d1c832014-12-21 22:27:55 +000032#include <netinet/in.h>
Damien Miller86687062014-07-02 15:28:02 +100033
djm@openbsd.org54924b52015-01-14 10:46:28 +000034#ifdef WITH_OPENSSL
Damien Miller86687062014-07-02 15:28:02 +100035#include <openssl/evp.h>
36#include <openssl/err.h>
37#include <openssl/pem.h>
djm@openbsd.org54924b52015-01-14 10:46:28 +000038#endif
Damien Miller86687062014-07-02 15:28:02 +100039
40#include "crypto_api.h"
41
42#include <errno.h>
deraadt@openbsd.org2ae4f332015-01-16 06:40:12 +000043#include <limits.h>
Damien Miller86687062014-07-02 15:28:02 +100044#include <stdio.h>
45#include <string.h>
Damien Millerd16bdd82014-12-22 10:18:09 +110046#include <resolv.h>
Damien Miller82b24822014-07-02 17:43:41 +100047#ifdef HAVE_UTIL_H
Damien Miller86687062014-07-02 15:28:02 +100048#include <util.h>
Damien Miller82b24822014-07-02 17:43:41 +100049#endif /* HAVE_UTIL_H */
Damien Miller86687062014-07-02 15:28:02 +100050
51#include "ssh2.h"
52#include "ssherr.h"
53#include "misc.h"
54#include "sshbuf.h"
55#include "rsa.h"
56#include "cipher.h"
57#include "digest.h"
58#define SSHKEY_INTERNAL
59#include "sshkey.h"
djm@openbsd.org1f729f02015-01-13 07:39:19 +000060#include "match.h"
Damien Miller86687062014-07-02 15:28:02 +100061
62/* openssh private key file format */
63#define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
64#define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
65#define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
66#define MARK_END_LEN (sizeof(MARK_END) - 1)
67#define KDFNAME "bcrypt"
68#define AUTH_MAGIC "openssh-key-v1"
69#define SALT_LEN 16
70#define DEFAULT_CIPHERNAME "aes256-cbc"
71#define DEFAULT_ROUNDS 16
72
73/* Version identification string for SSH v1 identity files. */
74#define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
75
djm@openbsd.org60b18252015-01-26 02:59:11 +000076static int sshkey_from_blob_internal(struct sshbuf *buf,
Damien Miller86687062014-07-02 15:28:02 +100077 struct sshkey **keyp, int allow_cert);
78
79/* Supported key types */
80struct keytype {
81 const char *name;
82 const char *shortname;
83 int type;
84 int nid;
85 int cert;
86};
87static const struct keytype keytypes[] = {
88 { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
89 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
90 KEY_ED25519_CERT, 0, 1 },
91#ifdef WITH_OPENSSL
92 { NULL, "RSA1", KEY_RSA1, 0, 0 },
93 { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
94 { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
95# ifdef OPENSSL_HAS_ECC
96 { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
97 { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
98# ifdef OPENSSL_HAS_NISTP521
99 { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
100# endif /* OPENSSL_HAS_NISTP521 */
101# endif /* OPENSSL_HAS_ECC */
102 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
103 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
104# ifdef OPENSSL_HAS_ECC
105 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
106 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
107 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
108 KEY_ECDSA_CERT, NID_secp384r1, 1 },
109# ifdef OPENSSL_HAS_NISTP521
110 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
111 KEY_ECDSA_CERT, NID_secp521r1, 1 },
112# endif /* OPENSSL_HAS_NISTP521 */
113# endif /* OPENSSL_HAS_ECC */
114 { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
115 KEY_RSA_CERT_V00, 0, 1 },
116 { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
117 KEY_DSA_CERT_V00, 0, 1 },
118#endif /* WITH_OPENSSL */
119 { NULL, NULL, -1, -1, 0 }
120};
121
122const char *
123sshkey_type(const struct sshkey *k)
124{
125 const struct keytype *kt;
126
127 for (kt = keytypes; kt->type != -1; kt++) {
128 if (kt->type == k->type)
129 return kt->shortname;
130 }
131 return "unknown";
132}
133
134static const char *
135sshkey_ssh_name_from_type_nid(int type, int nid)
136{
137 const struct keytype *kt;
138
139 for (kt = keytypes; kt->type != -1; kt++) {
140 if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
141 return kt->name;
142 }
143 return "ssh-unknown";
144}
145
146int
147sshkey_type_is_cert(int type)
148{
149 const struct keytype *kt;
150
151 for (kt = keytypes; kt->type != -1; kt++) {
152 if (kt->type == type)
153 return kt->cert;
154 }
155 return 0;
156}
157
158const char *
159sshkey_ssh_name(const struct sshkey *k)
160{
161 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
162}
163
164const char *
165sshkey_ssh_name_plain(const struct sshkey *k)
166{
167 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
168 k->ecdsa_nid);
169}
170
171int
172sshkey_type_from_name(const char *name)
173{
174 const struct keytype *kt;
175
176 for (kt = keytypes; kt->type != -1; kt++) {
177 /* Only allow shortname matches for plain key types */
178 if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
179 (!kt->cert && strcasecmp(kt->shortname, name) == 0))
180 return kt->type;
181 }
182 return KEY_UNSPEC;
183}
184
185int
186sshkey_ecdsa_nid_from_name(const char *name)
187{
188 const struct keytype *kt;
189
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +0000190 for (kt = keytypes; kt->type != -1; kt++) {
191 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
192 continue;
193 if (kt->name != NULL && strcmp(name, kt->name) == 0)
194 return kt->nid;
195 }
Damien Miller86687062014-07-02 15:28:02 +1000196 return -1;
197}
198
199char *
200key_alg_list(int certs_only, int plain_only)
201{
202 char *tmp, *ret = NULL;
203 size_t nlen, rlen = 0;
204 const struct keytype *kt;
205
206 for (kt = keytypes; kt->type != -1; kt++) {
207 if (kt->name == NULL)
208 continue;
209 if ((certs_only && !kt->cert) || (plain_only && kt->cert))
210 continue;
211 if (ret != NULL)
212 ret[rlen++] = '\n';
213 nlen = strlen(kt->name);
214 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
215 free(ret);
216 return NULL;
217 }
218 ret = tmp;
219 memcpy(ret + rlen, kt->name, nlen + 1);
220 rlen += nlen;
221 }
222 return ret;
223}
224
225int
djm@openbsd.org1f729f02015-01-13 07:39:19 +0000226sshkey_names_valid2(const char *names, int allow_wildcard)
Damien Miller86687062014-07-02 15:28:02 +1000227{
228 char *s, *cp, *p;
djm@openbsd.org1f729f02015-01-13 07:39:19 +0000229 const struct keytype *kt;
230 int type;
Damien Miller86687062014-07-02 15:28:02 +1000231
232 if (names == NULL || strcmp(names, "") == 0)
233 return 0;
234 if ((s = cp = strdup(names)) == NULL)
235 return 0;
236 for ((p = strsep(&cp, ",")); p && *p != '\0';
237 (p = strsep(&cp, ","))) {
djm@openbsd.org1f729f02015-01-13 07:39:19 +0000238 type = sshkey_type_from_name(p);
239 if (type == KEY_RSA1) {
240 free(s);
241 return 0;
242 }
243 if (type == KEY_UNSPEC) {
244 if (allow_wildcard) {
245 /*
246 * Try matching key types against the string.
247 * If any has a positive or negative match then
248 * the component is accepted.
249 */
250 for (kt = keytypes; kt->type != -1; kt++) {
251 if (kt->type == KEY_RSA1)
252 continue;
253 if (match_pattern_list(kt->name,
254 p, strlen(p), 0) != 0)
255 break;
256 }
257 if (kt->type != -1)
258 continue;
259 }
Damien Miller86687062014-07-02 15:28:02 +1000260 free(s);
261 return 0;
262 }
263 }
264 free(s);
265 return 1;
266}
267
268u_int
269sshkey_size(const struct sshkey *k)
270{
271 switch (k->type) {
272#ifdef WITH_OPENSSL
273 case KEY_RSA1:
274 case KEY_RSA:
275 case KEY_RSA_CERT_V00:
276 case KEY_RSA_CERT:
277 return BN_num_bits(k->rsa->n);
278 case KEY_DSA:
279 case KEY_DSA_CERT_V00:
280 case KEY_DSA_CERT:
281 return BN_num_bits(k->dsa->p);
282 case KEY_ECDSA:
283 case KEY_ECDSA_CERT:
284 return sshkey_curve_nid_to_bits(k->ecdsa_nid);
285#endif /* WITH_OPENSSL */
286 case KEY_ED25519:
287 case KEY_ED25519_CERT:
288 return 256; /* XXX */
289 }
290 return 0;
291}
292
293int
294sshkey_cert_is_legacy(const struct sshkey *k)
295{
296 switch (k->type) {
297 case KEY_DSA_CERT_V00:
298 case KEY_RSA_CERT_V00:
299 return 1;
300 default:
301 return 0;
302 }
303}
304
305static int
306sshkey_type_is_valid_ca(int type)
307{
308 switch (type) {
309 case KEY_RSA:
310 case KEY_DSA:
311 case KEY_ECDSA:
312 case KEY_ED25519:
313 return 1;
314 default:
315 return 0;
316 }
317}
318
319int
320sshkey_is_cert(const struct sshkey *k)
321{
322 if (k == NULL)
323 return 0;
324 return sshkey_type_is_cert(k->type);
325}
326
327/* Return the cert-less equivalent to a certified key type */
328int
329sshkey_type_plain(int type)
330{
331 switch (type) {
332 case KEY_RSA_CERT_V00:
333 case KEY_RSA_CERT:
334 return KEY_RSA;
335 case KEY_DSA_CERT_V00:
336 case KEY_DSA_CERT:
337 return KEY_DSA;
338 case KEY_ECDSA_CERT:
339 return KEY_ECDSA;
340 case KEY_ED25519_CERT:
341 return KEY_ED25519;
342 default:
343 return type;
344 }
345}
346
347#ifdef WITH_OPENSSL
348/* XXX: these are really begging for a table-driven approach */
349int
350sshkey_curve_name_to_nid(const char *name)
351{
352 if (strcmp(name, "nistp256") == 0)
353 return NID_X9_62_prime256v1;
354 else if (strcmp(name, "nistp384") == 0)
355 return NID_secp384r1;
356# ifdef OPENSSL_HAS_NISTP521
357 else if (strcmp(name, "nistp521") == 0)
358 return NID_secp521r1;
359# endif /* OPENSSL_HAS_NISTP521 */
360 else
361 return -1;
362}
363
364u_int
365sshkey_curve_nid_to_bits(int nid)
366{
367 switch (nid) {
368 case NID_X9_62_prime256v1:
369 return 256;
370 case NID_secp384r1:
371 return 384;
372# ifdef OPENSSL_HAS_NISTP521
373 case NID_secp521r1:
374 return 521;
375# endif /* OPENSSL_HAS_NISTP521 */
376 default:
377 return 0;
378 }
379}
380
381int
382sshkey_ecdsa_bits_to_nid(int bits)
383{
384 switch (bits) {
385 case 256:
386 return NID_X9_62_prime256v1;
387 case 384:
388 return NID_secp384r1;
389# ifdef OPENSSL_HAS_NISTP521
390 case 521:
391 return NID_secp521r1;
392# endif /* OPENSSL_HAS_NISTP521 */
393 default:
394 return -1;
395 }
396}
397
398const char *
399sshkey_curve_nid_to_name(int nid)
400{
401 switch (nid) {
402 case NID_X9_62_prime256v1:
403 return "nistp256";
404 case NID_secp384r1:
405 return "nistp384";
406# ifdef OPENSSL_HAS_NISTP521
407 case NID_secp521r1:
408 return "nistp521";
409# endif /* OPENSSL_HAS_NISTP521 */
410 default:
411 return NULL;
412 }
413}
414
415int
416sshkey_ec_nid_to_hash_alg(int nid)
417{
418 int kbits = sshkey_curve_nid_to_bits(nid);
419
420 if (kbits <= 0)
421 return -1;
422
423 /* RFC5656 section 6.2.1 */
424 if (kbits <= 256)
425 return SSH_DIGEST_SHA256;
426 else if (kbits <= 384)
427 return SSH_DIGEST_SHA384;
428 else
429 return SSH_DIGEST_SHA512;
430}
431#endif /* WITH_OPENSSL */
432
433static void
434cert_free(struct sshkey_cert *cert)
435{
436 u_int i;
437
438 if (cert == NULL)
439 return;
440 if (cert->certblob != NULL)
441 sshbuf_free(cert->certblob);
442 if (cert->critical != NULL)
443 sshbuf_free(cert->critical);
444 if (cert->extensions != NULL)
445 sshbuf_free(cert->extensions);
446 if (cert->key_id != NULL)
447 free(cert->key_id);
448 for (i = 0; i < cert->nprincipals; i++)
449 free(cert->principals[i]);
450 if (cert->principals != NULL)
451 free(cert->principals);
452 if (cert->signature_key != NULL)
453 sshkey_free(cert->signature_key);
454 explicit_bzero(cert, sizeof(*cert));
455 free(cert);
456}
457
458static struct sshkey_cert *
459cert_new(void)
460{
461 struct sshkey_cert *cert;
462
463 if ((cert = calloc(1, sizeof(*cert))) == NULL)
464 return NULL;
465 if ((cert->certblob = sshbuf_new()) == NULL ||
466 (cert->critical = sshbuf_new()) == NULL ||
467 (cert->extensions = sshbuf_new()) == NULL) {
468 cert_free(cert);
469 return NULL;
470 }
471 cert->key_id = NULL;
472 cert->principals = NULL;
473 cert->signature_key = NULL;
474 return cert;
475}
476
477struct sshkey *
478sshkey_new(int type)
479{
480 struct sshkey *k;
481#ifdef WITH_OPENSSL
482 RSA *rsa;
483 DSA *dsa;
484#endif /* WITH_OPENSSL */
485
486 if ((k = calloc(1, sizeof(*k))) == NULL)
487 return NULL;
488 k->type = type;
489 k->ecdsa = NULL;
490 k->ecdsa_nid = -1;
491 k->dsa = NULL;
492 k->rsa = NULL;
493 k->cert = NULL;
494 k->ed25519_sk = NULL;
495 k->ed25519_pk = NULL;
496 switch (k->type) {
497#ifdef WITH_OPENSSL
498 case KEY_RSA1:
499 case KEY_RSA:
500 case KEY_RSA_CERT_V00:
501 case KEY_RSA_CERT:
502 if ((rsa = RSA_new()) == NULL ||
503 (rsa->n = BN_new()) == NULL ||
504 (rsa->e = BN_new()) == NULL) {
505 if (rsa != NULL)
506 RSA_free(rsa);
507 free(k);
508 return NULL;
509 }
510 k->rsa = rsa;
511 break;
512 case KEY_DSA:
513 case KEY_DSA_CERT_V00:
514 case KEY_DSA_CERT:
515 if ((dsa = DSA_new()) == NULL ||
516 (dsa->p = BN_new()) == NULL ||
517 (dsa->q = BN_new()) == NULL ||
518 (dsa->g = BN_new()) == NULL ||
519 (dsa->pub_key = BN_new()) == NULL) {
520 if (dsa != NULL)
521 DSA_free(dsa);
522 free(k);
523 return NULL;
524 }
525 k->dsa = dsa;
526 break;
527 case KEY_ECDSA:
528 case KEY_ECDSA_CERT:
529 /* Cannot do anything until we know the group */
530 break;
531#endif /* WITH_OPENSSL */
532 case KEY_ED25519:
533 case KEY_ED25519_CERT:
534 /* no need to prealloc */
535 break;
536 case KEY_UNSPEC:
537 break;
538 default:
539 free(k);
540 return NULL;
541 break;
542 }
543
544 if (sshkey_is_cert(k)) {
545 if ((k->cert = cert_new()) == NULL) {
546 sshkey_free(k);
547 return NULL;
548 }
549 }
550
551 return k;
552}
553
554int
555sshkey_add_private(struct sshkey *k)
556{
557 switch (k->type) {
558#ifdef WITH_OPENSSL
559 case KEY_RSA1:
560 case KEY_RSA:
561 case KEY_RSA_CERT_V00:
562 case KEY_RSA_CERT:
563#define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
564 if (bn_maybe_alloc_failed(k->rsa->d) ||
565 bn_maybe_alloc_failed(k->rsa->iqmp) ||
566 bn_maybe_alloc_failed(k->rsa->q) ||
567 bn_maybe_alloc_failed(k->rsa->p) ||
568 bn_maybe_alloc_failed(k->rsa->dmq1) ||
569 bn_maybe_alloc_failed(k->rsa->dmp1))
570 return SSH_ERR_ALLOC_FAIL;
571 break;
572 case KEY_DSA:
573 case KEY_DSA_CERT_V00:
574 case KEY_DSA_CERT:
575 if (bn_maybe_alloc_failed(k->dsa->priv_key))
576 return SSH_ERR_ALLOC_FAIL;
577 break;
578#undef bn_maybe_alloc_failed
579 case KEY_ECDSA:
580 case KEY_ECDSA_CERT:
581 /* Cannot do anything until we know the group */
582 break;
583#endif /* WITH_OPENSSL */
584 case KEY_ED25519:
585 case KEY_ED25519_CERT:
586 /* no need to prealloc */
587 break;
588 case KEY_UNSPEC:
589 break;
590 default:
591 return SSH_ERR_INVALID_ARGUMENT;
592 }
593 return 0;
594}
595
596struct sshkey *
597sshkey_new_private(int type)
598{
599 struct sshkey *k = sshkey_new(type);
600
601 if (k == NULL)
602 return NULL;
603 if (sshkey_add_private(k) != 0) {
604 sshkey_free(k);
605 return NULL;
606 }
607 return k;
608}
609
610void
611sshkey_free(struct sshkey *k)
612{
613 if (k == NULL)
614 return;
615 switch (k->type) {
616#ifdef WITH_OPENSSL
617 case KEY_RSA1:
618 case KEY_RSA:
619 case KEY_RSA_CERT_V00:
620 case KEY_RSA_CERT:
621 if (k->rsa != NULL)
622 RSA_free(k->rsa);
623 k->rsa = NULL;
624 break;
625 case KEY_DSA:
626 case KEY_DSA_CERT_V00:
627 case KEY_DSA_CERT:
628 if (k->dsa != NULL)
629 DSA_free(k->dsa);
630 k->dsa = NULL;
631 break;
632# ifdef OPENSSL_HAS_ECC
633 case KEY_ECDSA:
634 case KEY_ECDSA_CERT:
635 if (k->ecdsa != NULL)
636 EC_KEY_free(k->ecdsa);
637 k->ecdsa = NULL;
638 break;
639# endif /* OPENSSL_HAS_ECC */
640#endif /* WITH_OPENSSL */
641 case KEY_ED25519:
642 case KEY_ED25519_CERT:
643 if (k->ed25519_pk) {
644 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
645 free(k->ed25519_pk);
646 k->ed25519_pk = NULL;
647 }
648 if (k->ed25519_sk) {
649 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
650 free(k->ed25519_sk);
651 k->ed25519_sk = NULL;
652 }
653 break;
654 case KEY_UNSPEC:
655 break;
656 default:
657 break;
658 }
659 if (sshkey_is_cert(k))
660 cert_free(k->cert);
661 explicit_bzero(k, sizeof(*k));
662 free(k);
663}
664
665static int
666cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
667{
668 if (a == NULL && b == NULL)
669 return 1;
670 if (a == NULL || b == NULL)
671 return 0;
672 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
673 return 0;
674 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
675 sshbuf_len(a->certblob)) != 0)
676 return 0;
677 return 1;
678}
679
680/*
681 * Compare public portions of key only, allowing comparisons between
682 * certificates and plain keys too.
683 */
684int
685sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
686{
Darren Tucker948a1772014-07-22 01:07:11 +1000687#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
Damien Miller86687062014-07-02 15:28:02 +1000688 BN_CTX *bnctx;
Darren Tucker948a1772014-07-22 01:07:11 +1000689#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
Damien Miller86687062014-07-02 15:28:02 +1000690
691 if (a == NULL || b == NULL ||
692 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
693 return 0;
694
695 switch (a->type) {
696#ifdef WITH_OPENSSL
697 case KEY_RSA1:
698 case KEY_RSA_CERT_V00:
699 case KEY_RSA_CERT:
700 case KEY_RSA:
701 return a->rsa != NULL && b->rsa != NULL &&
702 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
703 BN_cmp(a->rsa->n, b->rsa->n) == 0;
704 case KEY_DSA_CERT_V00:
705 case KEY_DSA_CERT:
706 case KEY_DSA:
707 return a->dsa != NULL && b->dsa != NULL &&
708 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
709 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
710 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
711 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
712# ifdef OPENSSL_HAS_ECC
713 case KEY_ECDSA_CERT:
714 case KEY_ECDSA:
715 if (a->ecdsa == NULL || b->ecdsa == NULL ||
716 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
717 EC_KEY_get0_public_key(b->ecdsa) == NULL)
718 return 0;
719 if ((bnctx = BN_CTX_new()) == NULL)
720 return 0;
721 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
722 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
723 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
724 EC_KEY_get0_public_key(a->ecdsa),
725 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
726 BN_CTX_free(bnctx);
727 return 0;
728 }
729 BN_CTX_free(bnctx);
730 return 1;
731# endif /* OPENSSL_HAS_ECC */
732#endif /* WITH_OPENSSL */
733 case KEY_ED25519:
734 case KEY_ED25519_CERT:
735 return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
736 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
737 default:
738 return 0;
739 }
740 /* NOTREACHED */
741}
742
743int
744sshkey_equal(const struct sshkey *a, const struct sshkey *b)
745{
746 if (a == NULL || b == NULL || a->type != b->type)
747 return 0;
748 if (sshkey_is_cert(a)) {
749 if (!cert_compare(a->cert, b->cert))
750 return 0;
751 }
752 return sshkey_equal_public(a, b);
753}
754
755static int
756to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
757{
758 int type, ret = SSH_ERR_INTERNAL_ERROR;
759 const char *typename;
760
761 if (key == NULL)
762 return SSH_ERR_INVALID_ARGUMENT;
763
764 type = force_plain ? sshkey_type_plain(key->type) : key->type;
765 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
766
767 switch (type) {
768#ifdef WITH_OPENSSL
769 case KEY_DSA_CERT_V00:
770 case KEY_RSA_CERT_V00:
771 case KEY_DSA_CERT:
772 case KEY_ECDSA_CERT:
773 case KEY_RSA_CERT:
774#endif /* WITH_OPENSSL */
775 case KEY_ED25519_CERT:
776 /* Use the existing blob */
777 /* XXX modified flag? */
778 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
779 return ret;
780 break;
781#ifdef WITH_OPENSSL
782 case KEY_DSA:
783 if (key->dsa == NULL)
784 return SSH_ERR_INVALID_ARGUMENT;
785 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
786 (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
787 (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
788 (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
789 (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
790 return ret;
791 break;
Darren Tuckerd1a04212014-07-19 07:23:55 +1000792# ifdef OPENSSL_HAS_ECC
Damien Miller86687062014-07-02 15:28:02 +1000793 case KEY_ECDSA:
794 if (key->ecdsa == NULL)
795 return SSH_ERR_INVALID_ARGUMENT;
796 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
797 (ret = sshbuf_put_cstring(b,
798 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
799 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
800 return ret;
801 break;
Darren Tuckerd1a04212014-07-19 07:23:55 +1000802# endif
Damien Miller86687062014-07-02 15:28:02 +1000803 case KEY_RSA:
804 if (key->rsa == NULL)
805 return SSH_ERR_INVALID_ARGUMENT;
806 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
807 (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
808 (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
809 return ret;
810 break;
811#endif /* WITH_OPENSSL */
812 case KEY_ED25519:
813 if (key->ed25519_pk == NULL)
814 return SSH_ERR_INVALID_ARGUMENT;
815 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
816 (ret = sshbuf_put_string(b,
817 key->ed25519_pk, ED25519_PK_SZ)) != 0)
818 return ret;
819 break;
820 default:
821 return SSH_ERR_KEY_TYPE_UNKNOWN;
822 }
823 return 0;
824}
825
826int
djm@openbsd.org60b18252015-01-26 02:59:11 +0000827sshkey_putb(const struct sshkey *key, struct sshbuf *b)
Damien Miller86687062014-07-02 15:28:02 +1000828{
829 return to_blob_buf(key, b, 0);
830}
831
832int
djm@openbsd.org60b18252015-01-26 02:59:11 +0000833sshkey_puts(const struct sshkey *key, struct sshbuf *b)
834{
835 struct sshbuf *tmp;
836 int r;
837
838 if ((tmp = sshbuf_new()) == NULL)
839 return SSH_ERR_ALLOC_FAIL;
840 r = to_blob_buf(key, tmp, 0);
841 if (r == 0)
842 r = sshbuf_put_stringb(b, tmp);
843 sshbuf_free(tmp);
844 return r;
845}
846
847int
848sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
Damien Miller86687062014-07-02 15:28:02 +1000849{
850 return to_blob_buf(key, b, 1);
851}
852
853static int
854to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
855{
856 int ret = SSH_ERR_INTERNAL_ERROR;
857 size_t len;
858 struct sshbuf *b = NULL;
859
860 if (lenp != NULL)
861 *lenp = 0;
862 if (blobp != NULL)
863 *blobp = NULL;
864 if ((b = sshbuf_new()) == NULL)
865 return SSH_ERR_ALLOC_FAIL;
866 if ((ret = to_blob_buf(key, b, force_plain)) != 0)
867 goto out;
868 len = sshbuf_len(b);
869 if (lenp != NULL)
870 *lenp = len;
871 if (blobp != NULL) {
872 if ((*blobp = malloc(len)) == NULL) {
873 ret = SSH_ERR_ALLOC_FAIL;
874 goto out;
875 }
876 memcpy(*blobp, sshbuf_ptr(b), len);
877 }
878 ret = 0;
879 out:
880 sshbuf_free(b);
881 return ret;
882}
883
884int
885sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
886{
887 return to_blob(key, blobp, lenp, 0);
888}
889
890int
891sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
892{
893 return to_blob(key, blobp, lenp, 1);
894}
895
896int
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000897sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
Damien Miller86687062014-07-02 15:28:02 +1000898 u_char **retp, size_t *lenp)
899{
900 u_char *blob = NULL, *ret = NULL;
901 size_t blob_len = 0;
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000902 int r = SSH_ERR_INTERNAL_ERROR;
Damien Miller86687062014-07-02 15:28:02 +1000903
904 if (retp != NULL)
905 *retp = NULL;
906 if (lenp != NULL)
907 *lenp = 0;
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000908 if (ssh_digest_bytes(dgst_alg) == 0) {
Damien Miller86687062014-07-02 15:28:02 +1000909 r = SSH_ERR_INVALID_ARGUMENT;
910 goto out;
911 }
912
913 if (k->type == KEY_RSA1) {
914#ifdef WITH_OPENSSL
915 int nlen = BN_num_bytes(k->rsa->n);
916 int elen = BN_num_bytes(k->rsa->e);
917
918 blob_len = nlen + elen;
919 if (nlen >= INT_MAX - elen ||
920 (blob = malloc(blob_len)) == NULL) {
921 r = SSH_ERR_ALLOC_FAIL;
922 goto out;
923 }
924 BN_bn2bin(k->rsa->n, blob);
925 BN_bn2bin(k->rsa->e, blob + nlen);
926#endif /* WITH_OPENSSL */
927 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
928 goto out;
929 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
930 r = SSH_ERR_ALLOC_FAIL;
931 goto out;
932 }
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000933 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
Damien Miller86687062014-07-02 15:28:02 +1000934 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
935 goto out;
936 /* success */
937 if (retp != NULL) {
938 *retp = ret;
939 ret = NULL;
940 }
941 if (lenp != NULL)
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000942 *lenp = ssh_digest_bytes(dgst_alg);
Damien Miller86687062014-07-02 15:28:02 +1000943 r = 0;
944 out:
945 free(ret);
946 if (blob != NULL) {
947 explicit_bzero(blob, blob_len);
948 free(blob);
949 }
950 return r;
951}
952
953static char *
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000954fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
Damien Miller86687062014-07-02 15:28:02 +1000955{
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000956 char *ret;
957 size_t plen = strlen(alg) + 1;
958 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
959 int r;
Damien Miller86687062014-07-02 15:28:02 +1000960
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000961 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
Damien Miller86687062014-07-02 15:28:02 +1000962 return NULL;
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000963 strlcpy(ret, alg, rlen);
964 strlcat(ret, ":", rlen);
965 if (dgst_raw_len == 0)
966 return ret;
967 if ((r = b64_ntop(dgst_raw, dgst_raw_len,
968 ret + plen, rlen - plen)) == -1) {
969 explicit_bzero(ret, rlen);
970 free(ret);
971 return NULL;
Damien Miller86687062014-07-02 15:28:02 +1000972 }
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000973 /* Trim padding characters from end */
974 ret[strcspn(ret, "=")] = '\0';
975 return ret;
976}
Damien Miller86687062014-07-02 15:28:02 +1000977
djm@openbsd.org56d1c832014-12-21 22:27:55 +0000978static char *
979fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
980{
981 char *retval, hex[5];
982 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
983
984 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
985 return NULL;
986 strlcpy(retval, alg, rlen);
987 strlcat(retval, ":", rlen);
988 for (i = 0; i < dgst_raw_len; i++) {
989 snprintf(hex, sizeof(hex), "%s%02x",
990 i > 0 ? ":" : "", dgst_raw[i]);
991 strlcat(retval, hex, rlen);
992 }
Damien Miller86687062014-07-02 15:28:02 +1000993 return retval;
994}
995
996static char *
997fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
998{
999 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1000 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1001 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1002 u_int i, j = 0, rounds, seed = 1;
1003 char *retval;
1004
1005 rounds = (dgst_raw_len / 2) + 1;
1006 if ((retval = calloc(rounds, 6)) == NULL)
1007 return NULL;
1008 retval[j++] = 'x';
1009 for (i = 0; i < rounds; i++) {
1010 u_int idx0, idx1, idx2, idx3, idx4;
1011 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1012 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1013 seed) % 6;
1014 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1015 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1016 (seed / 6)) % 6;
1017 retval[j++] = vowels[idx0];
1018 retval[j++] = consonants[idx1];
1019 retval[j++] = vowels[idx2];
1020 if ((i + 1) < rounds) {
1021 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1022 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1023 retval[j++] = consonants[idx3];
1024 retval[j++] = '-';
1025 retval[j++] = consonants[idx4];
1026 seed = ((seed * 5) +
1027 ((((u_int)(dgst_raw[2 * i])) * 7) +
1028 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1029 }
1030 } else {
1031 idx0 = seed % 6;
1032 idx1 = 16;
1033 idx2 = seed / 6;
1034 retval[j++] = vowels[idx0];
1035 retval[j++] = consonants[idx1];
1036 retval[j++] = vowels[idx2];
1037 }
1038 }
1039 retval[j++] = 'x';
1040 retval[j++] = '\0';
1041 return retval;
1042}
1043
1044/*
1045 * Draw an ASCII-Art representing the fingerprint so human brain can
1046 * profit from its built-in pattern recognition ability.
1047 * This technique is called "random art" and can be found in some
1048 * scientific publications like this original paper:
1049 *
1050 * "Hash Visualization: a New Technique to improve Real-World Security",
1051 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1052 * Techniques and E-Commerce (CrypTEC '99)
1053 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1054 *
1055 * The subject came up in a talk by Dan Kaminsky, too.
1056 *
1057 * If you see the picture is different, the key is different.
1058 * If the picture looks the same, you still know nothing.
1059 *
1060 * The algorithm used here is a worm crawling over a discrete plane,
1061 * leaving a trace (augmenting the field) everywhere it goes.
1062 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1063 * makes the respective movement vector be ignored for this turn.
1064 * Graphs are not unambiguous, because circles in graphs can be
1065 * walked in either direction.
1066 */
1067
1068/*
1069 * Field sizes for the random art. Have to be odd, so the starting point
1070 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1071 * Else pictures would be too dense, and drawing the frame would
1072 * fail, too, because the key type would not fit in anymore.
1073 */
1074#define FLDBASE 8
1075#define FLDSIZE_Y (FLDBASE + 1)
1076#define FLDSIZE_X (FLDBASE * 2 + 1)
1077static char *
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001078fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
Damien Miller86687062014-07-02 15:28:02 +10001079 const struct sshkey *k)
1080{
1081 /*
1082 * Chars to be used after each other every time the worm
1083 * intersects with itself. Matter of taste.
1084 */
1085 char *augmentation_string = " .o+=*BOX@%&#/^SE";
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001086 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
Damien Miller86687062014-07-02 15:28:02 +10001087 u_char field[FLDSIZE_X][FLDSIZE_Y];
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001088 size_t i, tlen, hlen;
Damien Miller86687062014-07-02 15:28:02 +10001089 u_int b;
Damien Miller61e28e52014-07-03 21:22:22 +10001090 int x, y, r;
Damien Miller86687062014-07-02 15:28:02 +10001091 size_t len = strlen(augmentation_string) - 1;
1092
1093 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1094 return NULL;
1095
1096 /* initialize field */
1097 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1098 x = FLDSIZE_X / 2;
1099 y = FLDSIZE_Y / 2;
1100
1101 /* process raw key */
1102 for (i = 0; i < dgst_raw_len; i++) {
1103 int input;
1104 /* each byte conveys four 2-bit move commands */
1105 input = dgst_raw[i];
1106 for (b = 0; b < 4; b++) {
1107 /* evaluate 2 bit, rest is shifted later */
1108 x += (input & 0x1) ? 1 : -1;
1109 y += (input & 0x2) ? 1 : -1;
1110
1111 /* assure we are still in bounds */
1112 x = MAX(x, 0);
1113 y = MAX(y, 0);
1114 x = MIN(x, FLDSIZE_X - 1);
1115 y = MIN(y, FLDSIZE_Y - 1);
1116
1117 /* augment the field */
1118 if (field[x][y] < len - 2)
1119 field[x][y]++;
1120 input = input >> 2;
1121 }
1122 }
1123
1124 /* mark starting point and end point*/
1125 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1126 field[x][y] = len;
1127
Damien Miller61e28e52014-07-03 21:22:22 +10001128 /* assemble title */
1129 r = snprintf(title, sizeof(title), "[%s %u]",
1130 sshkey_type(k), sshkey_size(k));
1131 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1132 if (r < 0 || r > (int)sizeof(title))
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001133 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1134 tlen = (r <= 0) ? 0 : strlen(title);
1135
1136 /* assemble hash ID. */
1137 r = snprintf(hash, sizeof(hash), "[%s]", alg);
1138 hlen = (r <= 0) ? 0 : strlen(hash);
Damien Miller86687062014-07-02 15:28:02 +10001139
1140 /* output upper border */
Damien Miller61e28e52014-07-03 21:22:22 +10001141 p = retval;
1142 *p++ = '+';
1143 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1144 *p++ = '-';
1145 memcpy(p, title, tlen);
1146 p += tlen;
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001147 for (i += tlen; i < FLDSIZE_X; i++)
Damien Miller86687062014-07-02 15:28:02 +10001148 *p++ = '-';
1149 *p++ = '+';
1150 *p++ = '\n';
1151
1152 /* output content */
1153 for (y = 0; y < FLDSIZE_Y; y++) {
1154 *p++ = '|';
1155 for (x = 0; x < FLDSIZE_X; x++)
1156 *p++ = augmentation_string[MIN(field[x][y], len)];
1157 *p++ = '|';
1158 *p++ = '\n';
1159 }
1160
1161 /* output lower border */
1162 *p++ = '+';
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001163 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1164 *p++ = '-';
1165 memcpy(p, hash, hlen);
1166 p += hlen;
1167 for (i += hlen; i < FLDSIZE_X; i++)
Damien Miller86687062014-07-02 15:28:02 +10001168 *p++ = '-';
1169 *p++ = '+';
1170
1171 return retval;
1172}
1173
1174char *
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001175sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
Damien Miller86687062014-07-02 15:28:02 +10001176 enum sshkey_fp_rep dgst_rep)
1177{
1178 char *retval = NULL;
1179 u_char *dgst_raw;
1180 size_t dgst_raw_len;
1181
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001182 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
Damien Miller86687062014-07-02 15:28:02 +10001183 return NULL;
1184 switch (dgst_rep) {
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001185 case SSH_FP_DEFAULT:
1186 if (dgst_alg == SSH_DIGEST_MD5) {
1187 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1188 dgst_raw, dgst_raw_len);
1189 } else {
1190 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1191 dgst_raw, dgst_raw_len);
1192 }
1193 break;
Damien Miller86687062014-07-02 15:28:02 +10001194 case SSH_FP_HEX:
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001195 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1196 dgst_raw, dgst_raw_len);
1197 break;
1198 case SSH_FP_BASE64:
1199 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1200 dgst_raw, dgst_raw_len);
Damien Miller86687062014-07-02 15:28:02 +10001201 break;
1202 case SSH_FP_BUBBLEBABBLE:
1203 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1204 break;
1205 case SSH_FP_RANDOMART:
djm@openbsd.org56d1c832014-12-21 22:27:55 +00001206 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1207 dgst_raw, dgst_raw_len, k);
Damien Miller86687062014-07-02 15:28:02 +10001208 break;
1209 default:
1210 explicit_bzero(dgst_raw, dgst_raw_len);
1211 free(dgst_raw);
1212 return NULL;
1213 }
1214 explicit_bzero(dgst_raw, dgst_raw_len);
1215 free(dgst_raw);
1216 return retval;
1217}
1218
1219#ifdef WITH_SSH1
1220/*
1221 * Reads a multiple-precision integer in decimal from the buffer, and advances
1222 * the pointer. The integer must already be initialized. This function is
1223 * permitted to modify the buffer. This leaves *cpp to point just beyond the
1224 * last processed character.
1225 */
1226static int
1227read_decimal_bignum(char **cpp, BIGNUM *v)
1228{
1229 char *cp;
1230 size_t e;
1231 int skip = 1; /* skip white space */
1232
1233 cp = *cpp;
1234 while (*cp == ' ' || *cp == '\t')
1235 cp++;
1236 e = strspn(cp, "0123456789");
1237 if (e == 0)
1238 return SSH_ERR_INVALID_FORMAT;
1239 if (e > SSHBUF_MAX_BIGNUM * 3)
1240 return SSH_ERR_BIGNUM_TOO_LARGE;
1241 if (cp[e] == '\0')
1242 skip = 0;
1243 else if (index(" \t\r\n", cp[e]) == NULL)
1244 return SSH_ERR_INVALID_FORMAT;
1245 cp[e] = '\0';
1246 if (BN_dec2bn(&v, cp) <= 0)
1247 return SSH_ERR_INVALID_FORMAT;
1248 *cpp = cp + e + skip;
1249 return 0;
1250}
1251#endif /* WITH_SSH1 */
1252
1253/* returns 0 ok, and < 0 error */
1254int
1255sshkey_read(struct sshkey *ret, char **cpp)
1256{
1257 struct sshkey *k;
1258 int retval = SSH_ERR_INVALID_FORMAT;
1259 char *cp, *space;
1260 int r, type, curve_nid = -1;
1261 struct sshbuf *blob;
1262#ifdef WITH_SSH1
1263 char *ep;
1264 u_long bits;
1265#endif /* WITH_SSH1 */
1266
1267 cp = *cpp;
1268
1269 switch (ret->type) {
1270 case KEY_RSA1:
1271#ifdef WITH_SSH1
1272 /* Get number of bits. */
1273 bits = strtoul(cp, &ep, 10);
1274 if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1275 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1276 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1277 /* Get public exponent, public modulus. */
1278 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1279 return r;
1280 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1281 return r;
1282 *cpp = ep;
1283 /* validate the claimed number of bits */
1284 if (BN_num_bits(ret->rsa->n) != (int)bits)
1285 return SSH_ERR_KEY_BITS_MISMATCH;
1286 retval = 0;
1287#endif /* WITH_SSH1 */
1288 break;
1289 case KEY_UNSPEC:
1290 case KEY_RSA:
1291 case KEY_DSA:
1292 case KEY_ECDSA:
1293 case KEY_ED25519:
1294 case KEY_DSA_CERT_V00:
1295 case KEY_RSA_CERT_V00:
1296 case KEY_DSA_CERT:
1297 case KEY_ECDSA_CERT:
1298 case KEY_RSA_CERT:
1299 case KEY_ED25519_CERT:
1300 space = strchr(cp, ' ');
1301 if (space == NULL)
1302 return SSH_ERR_INVALID_FORMAT;
1303 *space = '\0';
1304 type = sshkey_type_from_name(cp);
1305 if (sshkey_type_plain(type) == KEY_ECDSA &&
1306 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1307 return SSH_ERR_EC_CURVE_INVALID;
1308 *space = ' ';
1309 if (type == KEY_UNSPEC)
1310 return SSH_ERR_INVALID_FORMAT;
1311 cp = space+1;
1312 if (*cp == '\0')
1313 return SSH_ERR_INVALID_FORMAT;
djm@openbsd.orgd2d51002014-11-18 01:02:25 +00001314 if (ret->type != KEY_UNSPEC && ret->type != type)
Damien Miller86687062014-07-02 15:28:02 +10001315 return SSH_ERR_KEY_TYPE_MISMATCH;
1316 if ((blob = sshbuf_new()) == NULL)
1317 return SSH_ERR_ALLOC_FAIL;
1318 /* trim comment */
1319 space = strchr(cp, ' ');
markus@openbsd.org816d1532015-01-12 20:13:27 +00001320 if (space) {
1321 /* advance 'space': skip whitespace */
1322 *space++ = '\0';
1323 while (*space == ' ' || *space == '\t')
1324 space++;
1325 *cpp = space;
1326 } else
1327 *cpp = cp + strlen(cp);
Damien Miller86687062014-07-02 15:28:02 +10001328 if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1329 sshbuf_free(blob);
1330 return r;
1331 }
1332 if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1333 sshbuf_len(blob), &k)) != 0) {
1334 sshbuf_free(blob);
1335 return r;
1336 }
1337 sshbuf_free(blob);
1338 if (k->type != type) {
1339 sshkey_free(k);
1340 return SSH_ERR_KEY_TYPE_MISMATCH;
1341 }
1342 if (sshkey_type_plain(type) == KEY_ECDSA &&
1343 curve_nid != k->ecdsa_nid) {
1344 sshkey_free(k);
1345 return SSH_ERR_EC_CURVE_MISMATCH;
1346 }
djm@openbsd.orgd2d51002014-11-18 01:02:25 +00001347 ret->type = type;
Damien Miller86687062014-07-02 15:28:02 +10001348 if (sshkey_is_cert(ret)) {
1349 if (!sshkey_is_cert(k)) {
1350 sshkey_free(k);
1351 return SSH_ERR_EXPECTED_CERT;
1352 }
1353 if (ret->cert != NULL)
1354 cert_free(ret->cert);
1355 ret->cert = k->cert;
1356 k->cert = NULL;
1357 }
1358#ifdef WITH_OPENSSL
1359 if (sshkey_type_plain(ret->type) == KEY_RSA) {
1360 if (ret->rsa != NULL)
1361 RSA_free(ret->rsa);
1362 ret->rsa = k->rsa;
1363 k->rsa = NULL;
1364#ifdef DEBUG_PK
1365 RSA_print_fp(stderr, ret->rsa, 8);
1366#endif
1367 }
1368 if (sshkey_type_plain(ret->type) == KEY_DSA) {
1369 if (ret->dsa != NULL)
1370 DSA_free(ret->dsa);
1371 ret->dsa = k->dsa;
1372 k->dsa = NULL;
1373#ifdef DEBUG_PK
1374 DSA_print_fp(stderr, ret->dsa, 8);
1375#endif
1376 }
1377# ifdef OPENSSL_HAS_ECC
1378 if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1379 if (ret->ecdsa != NULL)
1380 EC_KEY_free(ret->ecdsa);
1381 ret->ecdsa = k->ecdsa;
1382 ret->ecdsa_nid = k->ecdsa_nid;
1383 k->ecdsa = NULL;
1384 k->ecdsa_nid = -1;
1385#ifdef DEBUG_PK
1386 sshkey_dump_ec_key(ret->ecdsa);
1387#endif
1388 }
1389# endif /* OPENSSL_HAS_ECC */
1390#endif /* WITH_OPENSSL */
1391 if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1392 free(ret->ed25519_pk);
1393 ret->ed25519_pk = k->ed25519_pk;
1394 k->ed25519_pk = NULL;
1395#ifdef DEBUG_PK
1396 /* XXX */
1397#endif
1398 }
1399 retval = 0;
1400/*XXXX*/
1401 sshkey_free(k);
1402 if (retval != 0)
1403 break;
Damien Miller86687062014-07-02 15:28:02 +10001404 break;
1405 default:
1406 return SSH_ERR_INVALID_ARGUMENT;
1407 }
1408 return retval;
1409}
1410
1411int
1412sshkey_write(const struct sshkey *key, FILE *f)
1413{
1414 int ret = SSH_ERR_INTERNAL_ERROR;
1415 struct sshbuf *b = NULL, *bb = NULL;
1416 char *uu = NULL;
1417#ifdef WITH_SSH1
1418 u_int bits = 0;
1419 char *dec_e = NULL, *dec_n = NULL;
1420#endif /* WITH_SSH1 */
1421
1422 if (sshkey_is_cert(key)) {
1423 if (key->cert == NULL)
1424 return SSH_ERR_EXPECTED_CERT;
1425 if (sshbuf_len(key->cert->certblob) == 0)
1426 return SSH_ERR_KEY_LACKS_CERTBLOB;
1427 }
1428 if ((b = sshbuf_new()) == NULL)
1429 return SSH_ERR_ALLOC_FAIL;
1430 switch (key->type) {
1431#ifdef WITH_SSH1
1432 case KEY_RSA1:
1433 if (key->rsa == NULL || key->rsa->e == NULL ||
1434 key->rsa->n == NULL) {
1435 ret = SSH_ERR_INVALID_ARGUMENT;
1436 goto out;
1437 }
1438 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1439 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1440 ret = SSH_ERR_ALLOC_FAIL;
1441 goto out;
1442 }
1443 /* size of modulus 'n' */
1444 if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1445 ret = SSH_ERR_INVALID_ARGUMENT;
1446 goto out;
1447 }
1448 if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1449 goto out;
1450#endif /* WITH_SSH1 */
1451 break;
1452#ifdef WITH_OPENSSL
1453 case KEY_DSA:
1454 case KEY_DSA_CERT_V00:
1455 case KEY_DSA_CERT:
1456 case KEY_ECDSA:
1457 case KEY_ECDSA_CERT:
1458 case KEY_RSA:
1459 case KEY_RSA_CERT_V00:
1460 case KEY_RSA_CERT:
1461#endif /* WITH_OPENSSL */
1462 case KEY_ED25519:
1463 case KEY_ED25519_CERT:
1464 if ((bb = sshbuf_new()) == NULL) {
1465 ret = SSH_ERR_ALLOC_FAIL;
1466 goto out;
1467 }
djm@openbsd.org60b18252015-01-26 02:59:11 +00001468 if ((ret = sshkey_putb(key, bb)) != 0)
Damien Miller86687062014-07-02 15:28:02 +10001469 goto out;
1470 if ((uu = sshbuf_dtob64(bb)) == NULL) {
1471 ret = SSH_ERR_ALLOC_FAIL;
1472 goto out;
1473 }
1474 if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
1475 goto out;
1476 if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
1477 goto out;
1478 break;
1479 default:
1480 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1481 goto out;
1482 }
1483 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1484 if (feof(f))
1485 errno = EPIPE;
1486 ret = SSH_ERR_SYSTEM_ERROR;
1487 goto out;
1488 }
1489 ret = 0;
1490 out:
1491 if (b != NULL)
1492 sshbuf_free(b);
1493 if (bb != NULL)
1494 sshbuf_free(bb);
1495 if (uu != NULL)
1496 free(uu);
1497#ifdef WITH_SSH1
1498 if (dec_e != NULL)
1499 OPENSSL_free(dec_e);
1500 if (dec_n != NULL)
1501 OPENSSL_free(dec_n);
1502#endif /* WITH_SSH1 */
1503 return ret;
1504}
1505
1506const char *
1507sshkey_cert_type(const struct sshkey *k)
1508{
1509 switch (k->cert->type) {
1510 case SSH2_CERT_TYPE_USER:
1511 return "user";
1512 case SSH2_CERT_TYPE_HOST:
1513 return "host";
1514 default:
1515 return "unknown";
1516 }
1517}
1518
1519#ifdef WITH_OPENSSL
1520static int
1521rsa_generate_private_key(u_int bits, RSA **rsap)
1522{
1523 RSA *private = NULL;
1524 BIGNUM *f4 = NULL;
1525 int ret = SSH_ERR_INTERNAL_ERROR;
1526
1527 if (rsap == NULL ||
1528 bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1529 bits > SSHBUF_MAX_BIGNUM * 8)
1530 return SSH_ERR_INVALID_ARGUMENT;
1531 *rsap = NULL;
1532 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1533 ret = SSH_ERR_ALLOC_FAIL;
1534 goto out;
1535 }
1536 if (!BN_set_word(f4, RSA_F4) ||
1537 !RSA_generate_key_ex(private, bits, f4, NULL)) {
1538 ret = SSH_ERR_LIBCRYPTO_ERROR;
1539 goto out;
1540 }
1541 *rsap = private;
1542 private = NULL;
1543 ret = 0;
1544 out:
1545 if (private != NULL)
1546 RSA_free(private);
1547 if (f4 != NULL)
1548 BN_free(f4);
1549 return ret;
1550}
1551
1552static int
1553dsa_generate_private_key(u_int bits, DSA **dsap)
1554{
1555 DSA *private;
1556 int ret = SSH_ERR_INTERNAL_ERROR;
1557
1558 if (dsap == NULL || bits != 1024)
1559 return SSH_ERR_INVALID_ARGUMENT;
1560 if ((private = DSA_new()) == NULL) {
1561 ret = SSH_ERR_ALLOC_FAIL;
1562 goto out;
1563 }
1564 *dsap = NULL;
1565 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1566 NULL, NULL) || !DSA_generate_key(private)) {
1567 DSA_free(private);
1568 ret = SSH_ERR_LIBCRYPTO_ERROR;
1569 goto out;
1570 }
1571 *dsap = private;
1572 private = NULL;
1573 ret = 0;
1574 out:
1575 if (private != NULL)
1576 DSA_free(private);
1577 return ret;
1578}
1579
1580# ifdef OPENSSL_HAS_ECC
1581int
1582sshkey_ecdsa_key_to_nid(EC_KEY *k)
1583{
1584 EC_GROUP *eg;
1585 int nids[] = {
1586 NID_X9_62_prime256v1,
1587 NID_secp384r1,
1588# ifdef OPENSSL_HAS_NISTP521
1589 NID_secp521r1,
1590# endif /* OPENSSL_HAS_NISTP521 */
1591 -1
1592 };
1593 int nid;
1594 u_int i;
1595 BN_CTX *bnctx;
1596 const EC_GROUP *g = EC_KEY_get0_group(k);
1597
1598 /*
1599 * The group may be stored in a ASN.1 encoded private key in one of two
1600 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1601 * or explicit group parameters encoded into the key blob. Only the
1602 * "named group" case sets the group NID for us, but we can figure
1603 * it out for the other case by comparing against all the groups that
1604 * are supported.
1605 */
1606 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1607 return nid;
1608 if ((bnctx = BN_CTX_new()) == NULL)
1609 return -1;
1610 for (i = 0; nids[i] != -1; i++) {
1611 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1612 BN_CTX_free(bnctx);
1613 return -1;
1614 }
1615 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1616 break;
1617 EC_GROUP_free(eg);
1618 }
1619 BN_CTX_free(bnctx);
1620 if (nids[i] != -1) {
1621 /* Use the group with the NID attached */
1622 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1623 if (EC_KEY_set_group(k, eg) != 1) {
1624 EC_GROUP_free(eg);
1625 return -1;
1626 }
1627 }
1628 return nids[i];
1629}
1630
1631static int
1632ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1633{
1634 EC_KEY *private;
1635 int ret = SSH_ERR_INTERNAL_ERROR;
1636
1637 if (nid == NULL || ecdsap == NULL ||
1638 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1639 return SSH_ERR_INVALID_ARGUMENT;
1640 *ecdsap = NULL;
1641 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1642 ret = SSH_ERR_ALLOC_FAIL;
1643 goto out;
1644 }
1645 if (EC_KEY_generate_key(private) != 1) {
1646 ret = SSH_ERR_LIBCRYPTO_ERROR;
1647 goto out;
1648 }
1649 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1650 *ecdsap = private;
1651 private = NULL;
1652 ret = 0;
1653 out:
1654 if (private != NULL)
1655 EC_KEY_free(private);
1656 return ret;
1657}
1658# endif /* OPENSSL_HAS_ECC */
1659#endif /* WITH_OPENSSL */
1660
1661int
1662sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1663{
1664 struct sshkey *k;
1665 int ret = SSH_ERR_INTERNAL_ERROR;
1666
1667 if (keyp == NULL)
1668 return SSH_ERR_INVALID_ARGUMENT;
1669 *keyp = NULL;
1670 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1671 return SSH_ERR_ALLOC_FAIL;
1672 switch (type) {
1673 case KEY_ED25519:
1674 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1675 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1676 ret = SSH_ERR_ALLOC_FAIL;
1677 break;
1678 }
1679 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1680 ret = 0;
1681 break;
1682#ifdef WITH_OPENSSL
1683 case KEY_DSA:
1684 ret = dsa_generate_private_key(bits, &k->dsa);
1685 break;
1686# ifdef OPENSSL_HAS_ECC
1687 case KEY_ECDSA:
1688 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1689 &k->ecdsa);
1690 break;
1691# endif /* OPENSSL_HAS_ECC */
1692 case KEY_RSA:
1693 case KEY_RSA1:
1694 ret = rsa_generate_private_key(bits, &k->rsa);
1695 break;
1696#endif /* WITH_OPENSSL */
1697 default:
1698 ret = SSH_ERR_INVALID_ARGUMENT;
1699 }
1700 if (ret == 0) {
1701 k->type = type;
1702 *keyp = k;
1703 } else
1704 sshkey_free(k);
1705 return ret;
1706}
1707
1708int
1709sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1710{
1711 u_int i;
1712 const struct sshkey_cert *from;
1713 struct sshkey_cert *to;
1714 int ret = SSH_ERR_INTERNAL_ERROR;
1715
1716 if (to_key->cert != NULL) {
1717 cert_free(to_key->cert);
1718 to_key->cert = NULL;
1719 }
1720
1721 if ((from = from_key->cert) == NULL)
1722 return SSH_ERR_INVALID_ARGUMENT;
1723
1724 if ((to = to_key->cert = cert_new()) == NULL)
1725 return SSH_ERR_ALLOC_FAIL;
1726
1727 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1728 (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1729 (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1730 return ret;
1731
1732 to->serial = from->serial;
1733 to->type = from->type;
1734 if (from->key_id == NULL)
1735 to->key_id = NULL;
1736 else if ((to->key_id = strdup(from->key_id)) == NULL)
1737 return SSH_ERR_ALLOC_FAIL;
1738 to->valid_after = from->valid_after;
1739 to->valid_before = from->valid_before;
1740 if (from->signature_key == NULL)
1741 to->signature_key = NULL;
1742 else if ((ret = sshkey_from_private(from->signature_key,
1743 &to->signature_key)) != 0)
1744 return ret;
1745
1746 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1747 return SSH_ERR_INVALID_ARGUMENT;
1748 if (from->nprincipals > 0) {
1749 if ((to->principals = calloc(from->nprincipals,
1750 sizeof(*to->principals))) == NULL)
1751 return SSH_ERR_ALLOC_FAIL;
1752 for (i = 0; i < from->nprincipals; i++) {
1753 to->principals[i] = strdup(from->principals[i]);
1754 if (to->principals[i] == NULL) {
1755 to->nprincipals = i;
1756 return SSH_ERR_ALLOC_FAIL;
1757 }
1758 }
1759 }
1760 to->nprincipals = from->nprincipals;
1761 return 0;
1762}
1763
1764int
1765sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1766{
1767 struct sshkey *n = NULL;
1768 int ret = SSH_ERR_INTERNAL_ERROR;
1769
1770 if (pkp != NULL)
1771 *pkp = NULL;
1772
1773 switch (k->type) {
1774#ifdef WITH_OPENSSL
1775 case KEY_DSA:
1776 case KEY_DSA_CERT_V00:
1777 case KEY_DSA_CERT:
1778 if ((n = sshkey_new(k->type)) == NULL)
1779 return SSH_ERR_ALLOC_FAIL;
1780 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1781 (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1782 (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1783 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1784 sshkey_free(n);
1785 return SSH_ERR_ALLOC_FAIL;
1786 }
1787 break;
1788# ifdef OPENSSL_HAS_ECC
1789 case KEY_ECDSA:
1790 case KEY_ECDSA_CERT:
1791 if ((n = sshkey_new(k->type)) == NULL)
1792 return SSH_ERR_ALLOC_FAIL;
1793 n->ecdsa_nid = k->ecdsa_nid;
1794 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1795 if (n->ecdsa == NULL) {
1796 sshkey_free(n);
1797 return SSH_ERR_ALLOC_FAIL;
1798 }
1799 if (EC_KEY_set_public_key(n->ecdsa,
1800 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1801 sshkey_free(n);
1802 return SSH_ERR_LIBCRYPTO_ERROR;
1803 }
1804 break;
1805# endif /* OPENSSL_HAS_ECC */
1806 case KEY_RSA:
1807 case KEY_RSA1:
1808 case KEY_RSA_CERT_V00:
1809 case KEY_RSA_CERT:
1810 if ((n = sshkey_new(k->type)) == NULL)
1811 return SSH_ERR_ALLOC_FAIL;
1812 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1813 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1814 sshkey_free(n);
1815 return SSH_ERR_ALLOC_FAIL;
1816 }
1817 break;
1818#endif /* WITH_OPENSSL */
1819 case KEY_ED25519:
1820 case KEY_ED25519_CERT:
1821 if ((n = sshkey_new(k->type)) == NULL)
1822 return SSH_ERR_ALLOC_FAIL;
1823 if (k->ed25519_pk != NULL) {
1824 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1825 sshkey_free(n);
1826 return SSH_ERR_ALLOC_FAIL;
1827 }
1828 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1829 }
1830 break;
1831 default:
1832 return SSH_ERR_KEY_TYPE_UNKNOWN;
1833 }
1834 if (sshkey_is_cert(k)) {
1835 if ((ret = sshkey_cert_copy(k, n)) != 0) {
1836 sshkey_free(n);
1837 return ret;
1838 }
1839 }
1840 *pkp = n;
1841 return 0;
1842}
1843
1844static int
djm@openbsd.org60b18252015-01-26 02:59:11 +00001845cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
Damien Miller86687062014-07-02 15:28:02 +10001846{
djm@openbsd.org60b18252015-01-26 02:59:11 +00001847 struct sshbuf *principals = NULL, *crit = NULL;
1848 struct sshbuf *exts = NULL, *ca = NULL;
1849 u_char *sig = NULL;
1850 size_t signed_len = 0, slen = 0, kidlen = 0;
Damien Miller86687062014-07-02 15:28:02 +10001851 int ret = SSH_ERR_INTERNAL_ERROR;
1852 int v00 = sshkey_cert_is_legacy(key);
Damien Miller86687062014-07-02 15:28:02 +10001853
1854 /* Copy the entire key blob for verification and later serialisation */
djm@openbsd.org60b18252015-01-26 02:59:11 +00001855 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
Damien Miller86687062014-07-02 15:28:02 +10001856 return ret;
1857
Damien Miller86687062014-07-02 15:28:02 +10001858 if ((!v00 && (ret = sshbuf_get_u64(b, &key->cert->serial)) != 0) ||
1859 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1860 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001861 (ret = sshbuf_froms(b, &principals)) != 0 ||
Damien Miller86687062014-07-02 15:28:02 +10001862 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1863 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001864 (ret = sshbuf_froms(b, &crit)) != 0 ||
1865 (!v00 && (ret = sshbuf_froms(b, &exts)) != 0) ||
Damien Miller86687062014-07-02 15:28:02 +10001866 (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
1867 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
djm@openbsd.org60b18252015-01-26 02:59:11 +00001868 (ret = sshbuf_froms(b, &ca)) != 0) {
Damien Miller86687062014-07-02 15:28:02 +10001869 /* XXX debug print error for ret */
1870 ret = SSH_ERR_INVALID_FORMAT;
1871 goto out;
1872 }
1873
1874 /* Signature is left in the buffer so we can calculate this length */
1875 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1876
1877 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1878 ret = SSH_ERR_INVALID_FORMAT;
1879 goto out;
1880 }
1881
1882 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1883 key->cert->type != SSH2_CERT_TYPE_HOST) {
1884 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1885 goto out;
1886 }
1887
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001888 /* Parse principals section */
1889 while (sshbuf_len(principals) > 0) {
1890 char *principal = NULL;
1891 char **oprincipals = NULL;
1892
Damien Miller86687062014-07-02 15:28:02 +10001893 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1894 ret = SSH_ERR_INVALID_FORMAT;
1895 goto out;
1896 }
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001897 if ((ret = sshbuf_get_cstring(principals, &principal,
1898 NULL)) != 0) {
Damien Miller86687062014-07-02 15:28:02 +10001899 ret = SSH_ERR_INVALID_FORMAT;
1900 goto out;
1901 }
1902 oprincipals = key->cert->principals;
1903 key->cert->principals = realloc(key->cert->principals,
1904 (key->cert->nprincipals + 1) *
1905 sizeof(*key->cert->principals));
1906 if (key->cert->principals == NULL) {
1907 free(principal);
1908 key->cert->principals = oprincipals;
1909 ret = SSH_ERR_ALLOC_FAIL;
1910 goto out;
1911 }
1912 key->cert->principals[key->cert->nprincipals++] = principal;
1913 }
1914
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001915 /*
1916 * Stash a copies of the critical options and extensions sections
1917 * for later use.
1918 */
1919 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1920 (exts != NULL &&
1921 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
Damien Miller86687062014-07-02 15:28:02 +10001922 goto out;
1923
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001924 /*
1925 * Validate critical options and extensions sections format.
1926 * NB. extensions are not present in v00 certs.
1927 */
1928 while (sshbuf_len(crit) != 0) {
1929 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1930 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1931 sshbuf_reset(key->cert->critical);
Damien Miller86687062014-07-02 15:28:02 +10001932 ret = SSH_ERR_INVALID_FORMAT;
1933 goto out;
1934 }
1935 }
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001936 while (exts != NULL && sshbuf_len(exts) != 0) {
1937 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1938 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1939 sshbuf_reset(key->cert->extensions);
Damien Miller86687062014-07-02 15:28:02 +10001940 ret = SSH_ERR_INVALID_FORMAT;
1941 goto out;
1942 }
1943 }
Damien Miller86687062014-07-02 15:28:02 +10001944
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001945 /* Parse CA key and check signature */
djm@openbsd.org60b18252015-01-26 02:59:11 +00001946 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
Damien Miller86687062014-07-02 15:28:02 +10001947 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1948 goto out;
1949 }
1950 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1951 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1952 goto out;
1953 }
Damien Miller86687062014-07-02 15:28:02 +10001954 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1955 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1956 goto out;
Damien Miller86687062014-07-02 15:28:02 +10001957
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001958 /* Success */
1959 ret = 0;
Damien Miller86687062014-07-02 15:28:02 +10001960 out:
djm@openbsd.org60b18252015-01-26 02:59:11 +00001961 sshbuf_free(ca);
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00001962 sshbuf_free(crit);
1963 sshbuf_free(exts);
1964 sshbuf_free(principals);
Damien Miller86687062014-07-02 15:28:02 +10001965 free(sig);
1966 return ret;
1967}
1968
1969static int
djm@openbsd.org60b18252015-01-26 02:59:11 +00001970sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1971 int allow_cert)
Damien Miller86687062014-07-02 15:28:02 +10001972{
djm@openbsd.org54924b52015-01-14 10:46:28 +00001973 int type, ret = SSH_ERR_INTERNAL_ERROR;
Damien Miller86687062014-07-02 15:28:02 +10001974 char *ktype = NULL, *curve = NULL;
1975 struct sshkey *key = NULL;
1976 size_t len;
1977 u_char *pk = NULL;
djm@openbsd.org60b18252015-01-26 02:59:11 +00001978 struct sshbuf *copy;
Damien Miller86687062014-07-02 15:28:02 +10001979#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
1980 EC_POINT *q = NULL;
1981#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
1982
1983#ifdef DEBUG_PK /* XXX */
djm@openbsd.org60b18252015-01-26 02:59:11 +00001984 sshbuf_dump(b, stderr);
Damien Miller86687062014-07-02 15:28:02 +10001985#endif
1986 *keyp = NULL;
djm@openbsd.org60b18252015-01-26 02:59:11 +00001987 if ((copy = sshbuf_fromb(b)) == NULL) {
1988 ret = SSH_ERR_ALLOC_FAIL;
1989 goto out;
1990 }
Damien Miller86687062014-07-02 15:28:02 +10001991 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1992 ret = SSH_ERR_INVALID_FORMAT;
1993 goto out;
1994 }
1995
1996 type = sshkey_type_from_name(ktype);
Damien Miller86687062014-07-02 15:28:02 +10001997 if (!allow_cert && sshkey_type_is_cert(type)) {
1998 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1999 goto out;
2000 }
2001 switch (type) {
2002#ifdef WITH_OPENSSL
2003 case KEY_RSA_CERT:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002004 /* Skip nonce */
Damien Miller86687062014-07-02 15:28:02 +10002005 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2006 ret = SSH_ERR_INVALID_FORMAT;
2007 goto out;
2008 }
2009 /* FALLTHROUGH */
2010 case KEY_RSA:
2011 case KEY_RSA_CERT_V00:
2012 if ((key = sshkey_new(type)) == NULL) {
2013 ret = SSH_ERR_ALLOC_FAIL;
2014 goto out;
2015 }
djm@openbsd.org3f4ea3c2015-04-03 22:17:27 +00002016 if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
2017 sshbuf_get_bignum2(b, key->rsa->n) != 0) {
Damien Miller86687062014-07-02 15:28:02 +10002018 ret = SSH_ERR_INVALID_FORMAT;
2019 goto out;
2020 }
2021#ifdef DEBUG_PK
2022 RSA_print_fp(stderr, key->rsa, 8);
2023#endif
2024 break;
2025 case KEY_DSA_CERT:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002026 /* Skip nonce */
Damien Miller86687062014-07-02 15:28:02 +10002027 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2028 ret = SSH_ERR_INVALID_FORMAT;
2029 goto out;
2030 }
2031 /* FALLTHROUGH */
2032 case KEY_DSA:
2033 case KEY_DSA_CERT_V00:
2034 if ((key = sshkey_new(type)) == NULL) {
2035 ret = SSH_ERR_ALLOC_FAIL;
2036 goto out;
2037 }
djm@openbsd.org3f4ea3c2015-04-03 22:17:27 +00002038 if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
2039 sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
2040 sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
2041 sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
Damien Miller86687062014-07-02 15:28:02 +10002042 ret = SSH_ERR_INVALID_FORMAT;
2043 goto out;
2044 }
2045#ifdef DEBUG_PK
2046 DSA_print_fp(stderr, key->dsa, 8);
2047#endif
2048 break;
2049 case KEY_ECDSA_CERT:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002050 /* Skip nonce */
Damien Miller86687062014-07-02 15:28:02 +10002051 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2052 ret = SSH_ERR_INVALID_FORMAT;
2053 goto out;
2054 }
2055 /* FALLTHROUGH */
2056# ifdef OPENSSL_HAS_ECC
2057 case KEY_ECDSA:
2058 if ((key = sshkey_new(type)) == NULL) {
2059 ret = SSH_ERR_ALLOC_FAIL;
2060 goto out;
2061 }
djm@openbsd.org54924b52015-01-14 10:46:28 +00002062 key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
Damien Miller86687062014-07-02 15:28:02 +10002063 if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2064 ret = SSH_ERR_INVALID_FORMAT;
2065 goto out;
2066 }
2067 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2068 ret = SSH_ERR_EC_CURVE_MISMATCH;
2069 goto out;
2070 }
2071 if (key->ecdsa != NULL)
2072 EC_KEY_free(key->ecdsa);
2073 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2074 == NULL) {
2075 ret = SSH_ERR_EC_CURVE_INVALID;
2076 goto out;
2077 }
2078 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2079 ret = SSH_ERR_ALLOC_FAIL;
2080 goto out;
2081 }
2082 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2083 ret = SSH_ERR_INVALID_FORMAT;
2084 goto out;
2085 }
2086 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2087 q) != 0) {
2088 ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2089 goto out;
2090 }
2091 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2092 /* XXX assume it is a allocation error */
2093 ret = SSH_ERR_ALLOC_FAIL;
2094 goto out;
2095 }
2096#ifdef DEBUG_PK
2097 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2098#endif
2099 break;
2100# endif /* OPENSSL_HAS_ECC */
2101#endif /* WITH_OPENSSL */
2102 case KEY_ED25519_CERT:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002103 /* Skip nonce */
Damien Miller86687062014-07-02 15:28:02 +10002104 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2105 ret = SSH_ERR_INVALID_FORMAT;
2106 goto out;
2107 }
2108 /* FALLTHROUGH */
2109 case KEY_ED25519:
2110 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2111 goto out;
2112 if (len != ED25519_PK_SZ) {
2113 ret = SSH_ERR_INVALID_FORMAT;
2114 goto out;
2115 }
2116 if ((key = sshkey_new(type)) == NULL) {
2117 ret = SSH_ERR_ALLOC_FAIL;
2118 goto out;
2119 }
2120 key->ed25519_pk = pk;
2121 pk = NULL;
2122 break;
2123 case KEY_UNSPEC:
2124 if ((key = sshkey_new(type)) == NULL) {
2125 ret = SSH_ERR_ALLOC_FAIL;
2126 goto out;
2127 }
2128 break;
2129 default:
2130 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2131 goto out;
2132 }
2133
2134 /* Parse certificate potion */
djm@openbsd.org60b18252015-01-26 02:59:11 +00002135 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
Damien Miller86687062014-07-02 15:28:02 +10002136 goto out;
2137
2138 if (key != NULL && sshbuf_len(b) != 0) {
2139 ret = SSH_ERR_INVALID_FORMAT;
2140 goto out;
2141 }
2142 ret = 0;
2143 *keyp = key;
2144 key = NULL;
2145 out:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002146 sshbuf_free(copy);
Damien Miller86687062014-07-02 15:28:02 +10002147 sshkey_free(key);
2148 free(ktype);
2149 free(curve);
2150 free(pk);
2151#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2152 if (q != NULL)
2153 EC_POINT_free(q);
2154#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2155 return ret;
2156}
2157
2158int
2159sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2160{
djm@openbsd.org60b18252015-01-26 02:59:11 +00002161 struct sshbuf *b;
2162 int r;
2163
2164 if ((b = sshbuf_from(blob, blen)) == NULL)
2165 return SSH_ERR_ALLOC_FAIL;
2166 r = sshkey_from_blob_internal(b, keyp, 1);
2167 sshbuf_free(b);
2168 return r;
2169}
2170
2171int
2172sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2173{
2174 return sshkey_from_blob_internal(b, keyp, 1);
2175}
2176
2177int
2178sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2179{
2180 struct sshbuf *b;
2181 int r;
2182
2183 if ((r = sshbuf_froms(buf, &b)) != 0)
2184 return r;
2185 r = sshkey_from_blob_internal(b, keyp, 1);
2186 sshbuf_free(b);
2187 return r;
Damien Miller86687062014-07-02 15:28:02 +10002188}
2189
2190int
2191sshkey_sign(const struct sshkey *key,
2192 u_char **sigp, size_t *lenp,
2193 const u_char *data, size_t datalen, u_int compat)
2194{
2195 if (sigp != NULL)
2196 *sigp = NULL;
2197 if (lenp != NULL)
2198 *lenp = 0;
2199 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2200 return SSH_ERR_INVALID_ARGUMENT;
2201 switch (key->type) {
2202#ifdef WITH_OPENSSL
2203 case KEY_DSA_CERT_V00:
2204 case KEY_DSA_CERT:
2205 case KEY_DSA:
2206 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2207# ifdef OPENSSL_HAS_ECC
2208 case KEY_ECDSA_CERT:
2209 case KEY_ECDSA:
2210 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2211# endif /* OPENSSL_HAS_ECC */
2212 case KEY_RSA_CERT_V00:
2213 case KEY_RSA_CERT:
2214 case KEY_RSA:
2215 return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2216#endif /* WITH_OPENSSL */
2217 case KEY_ED25519:
2218 case KEY_ED25519_CERT:
2219 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2220 default:
2221 return SSH_ERR_KEY_TYPE_UNKNOWN;
2222 }
2223}
2224
2225/*
2226 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2227 */
2228int
2229sshkey_verify(const struct sshkey *key,
2230 const u_char *sig, size_t siglen,
2231 const u_char *data, size_t dlen, u_int compat)
2232{
djm@openbsd.org4cf87f42014-12-10 01:24:09 +00002233 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
Damien Miller86687062014-07-02 15:28:02 +10002234 return SSH_ERR_INVALID_ARGUMENT;
2235 switch (key->type) {
2236#ifdef WITH_OPENSSL
2237 case KEY_DSA_CERT_V00:
2238 case KEY_DSA_CERT:
2239 case KEY_DSA:
2240 return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2241# ifdef OPENSSL_HAS_ECC
2242 case KEY_ECDSA_CERT:
2243 case KEY_ECDSA:
2244 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2245# endif /* OPENSSL_HAS_ECC */
2246 case KEY_RSA_CERT_V00:
2247 case KEY_RSA_CERT:
2248 case KEY_RSA:
2249 return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2250#endif /* WITH_OPENSSL */
2251 case KEY_ED25519:
2252 case KEY_ED25519_CERT:
2253 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2254 default:
2255 return SSH_ERR_KEY_TYPE_UNKNOWN;
2256 }
2257}
2258
2259/* Converts a private to a public key */
2260int
2261sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2262{
2263 struct sshkey *pk;
2264 int ret = SSH_ERR_INTERNAL_ERROR;
2265
2266 if (dkp != NULL)
2267 *dkp = NULL;
2268
2269 if ((pk = calloc(1, sizeof(*pk))) == NULL)
2270 return SSH_ERR_ALLOC_FAIL;
2271 pk->type = k->type;
2272 pk->flags = k->flags;
2273 pk->ecdsa_nid = k->ecdsa_nid;
2274 pk->dsa = NULL;
2275 pk->ecdsa = NULL;
2276 pk->rsa = NULL;
2277 pk->ed25519_pk = NULL;
2278 pk->ed25519_sk = NULL;
2279
2280 switch (k->type) {
2281#ifdef WITH_OPENSSL
2282 case KEY_RSA_CERT_V00:
2283 case KEY_RSA_CERT:
2284 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2285 goto fail;
2286 /* FALLTHROUGH */
2287 case KEY_RSA1:
2288 case KEY_RSA:
2289 if ((pk->rsa = RSA_new()) == NULL ||
2290 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2291 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2292 ret = SSH_ERR_ALLOC_FAIL;
2293 goto fail;
2294 }
2295 break;
2296 case KEY_DSA_CERT_V00:
2297 case KEY_DSA_CERT:
2298 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2299 goto fail;
2300 /* FALLTHROUGH */
2301 case KEY_DSA:
2302 if ((pk->dsa = DSA_new()) == NULL ||
2303 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2304 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2305 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2306 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2307 ret = SSH_ERR_ALLOC_FAIL;
2308 goto fail;
2309 }
2310 break;
2311 case KEY_ECDSA_CERT:
2312 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2313 goto fail;
2314 /* FALLTHROUGH */
2315# ifdef OPENSSL_HAS_ECC
2316 case KEY_ECDSA:
2317 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2318 if (pk->ecdsa == NULL) {
2319 ret = SSH_ERR_ALLOC_FAIL;
2320 goto fail;
2321 }
2322 if (EC_KEY_set_public_key(pk->ecdsa,
2323 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2324 ret = SSH_ERR_LIBCRYPTO_ERROR;
2325 goto fail;
2326 }
2327 break;
2328# endif /* OPENSSL_HAS_ECC */
2329#endif /* WITH_OPENSSL */
2330 case KEY_ED25519_CERT:
2331 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2332 goto fail;
2333 /* FALLTHROUGH */
2334 case KEY_ED25519:
2335 if (k->ed25519_pk != NULL) {
2336 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2337 ret = SSH_ERR_ALLOC_FAIL;
2338 goto fail;
2339 }
2340 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2341 }
2342 break;
2343 default:
2344 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2345 fail:
2346 sshkey_free(pk);
2347 return ret;
2348 }
2349 *dkp = pk;
2350 return 0;
2351}
2352
2353/* Convert a plain key to their _CERT equivalent */
2354int
2355sshkey_to_certified(struct sshkey *k, int legacy)
2356{
2357 int newtype;
2358
2359 switch (k->type) {
2360#ifdef WITH_OPENSSL
2361 case KEY_RSA:
2362 newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
2363 break;
2364 case KEY_DSA:
2365 newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
2366 break;
2367 case KEY_ECDSA:
2368 if (legacy)
2369 return SSH_ERR_INVALID_ARGUMENT;
2370 newtype = KEY_ECDSA_CERT;
2371 break;
2372#endif /* WITH_OPENSSL */
2373 case KEY_ED25519:
2374 if (legacy)
2375 return SSH_ERR_INVALID_ARGUMENT;
2376 newtype = KEY_ED25519_CERT;
2377 break;
2378 default:
2379 return SSH_ERR_INVALID_ARGUMENT;
2380 }
2381 if ((k->cert = cert_new()) == NULL)
2382 return SSH_ERR_ALLOC_FAIL;
2383 k->type = newtype;
2384 return 0;
2385}
2386
2387/* Convert a certificate to its raw key equivalent */
2388int
2389sshkey_drop_cert(struct sshkey *k)
2390{
2391 if (!sshkey_type_is_cert(k->type))
2392 return SSH_ERR_KEY_TYPE_UNKNOWN;
2393 cert_free(k->cert);
2394 k->cert = NULL;
2395 k->type = sshkey_type_plain(k->type);
2396 return 0;
2397}
2398
2399/* Sign a certified key, (re-)generating the signed certblob. */
2400int
2401sshkey_certify(struct sshkey *k, struct sshkey *ca)
2402{
2403 struct sshbuf *principals = NULL;
2404 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2405 size_t i, ca_len, sig_len;
2406 int ret = SSH_ERR_INTERNAL_ERROR;
2407 struct sshbuf *cert;
2408
2409 if (k == NULL || k->cert == NULL ||
2410 k->cert->certblob == NULL || ca == NULL)
2411 return SSH_ERR_INVALID_ARGUMENT;
2412 if (!sshkey_is_cert(k))
2413 return SSH_ERR_KEY_TYPE_UNKNOWN;
2414 if (!sshkey_type_is_valid_ca(ca->type))
2415 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2416
2417 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2418 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2419
2420 cert = k->cert->certblob; /* for readability */
2421 sshbuf_reset(cert);
2422 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2423 goto out;
2424
2425 /* -v01 certs put nonce first */
2426 arc4random_buf(&nonce, sizeof(nonce));
2427 if (!sshkey_cert_is_legacy(k)) {
2428 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2429 goto out;
2430 }
2431
2432 /* XXX this substantially duplicates to_blob(); refactor */
2433 switch (k->type) {
2434#ifdef WITH_OPENSSL
2435 case KEY_DSA_CERT_V00:
2436 case KEY_DSA_CERT:
2437 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2438 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2439 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2440 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2441 goto out;
2442 break;
2443# ifdef OPENSSL_HAS_ECC
2444 case KEY_ECDSA_CERT:
2445 if ((ret = sshbuf_put_cstring(cert,
2446 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2447 (ret = sshbuf_put_ec(cert,
2448 EC_KEY_get0_public_key(k->ecdsa),
2449 EC_KEY_get0_group(k->ecdsa))) != 0)
2450 goto out;
2451 break;
2452# endif /* OPENSSL_HAS_ECC */
2453 case KEY_RSA_CERT_V00:
2454 case KEY_RSA_CERT:
2455 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2456 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2457 goto out;
2458 break;
2459#endif /* WITH_OPENSSL */
2460 case KEY_ED25519_CERT:
2461 if ((ret = sshbuf_put_string(cert,
2462 k->ed25519_pk, ED25519_PK_SZ)) != 0)
2463 goto out;
2464 break;
2465 default:
2466 ret = SSH_ERR_INVALID_ARGUMENT;
djm@openbsd.org55e5bde2015-03-06 01:40:56 +00002467 goto out;
Damien Miller86687062014-07-02 15:28:02 +10002468 }
2469
2470 /* -v01 certs have a serial number next */
2471 if (!sshkey_cert_is_legacy(k)) {
2472 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
2473 goto out;
2474 }
2475
2476 if ((ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2477 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2478 goto out;
2479
2480 if ((principals = sshbuf_new()) == NULL) {
2481 ret = SSH_ERR_ALLOC_FAIL;
2482 goto out;
2483 }
2484 for (i = 0; i < k->cert->nprincipals; i++) {
2485 if ((ret = sshbuf_put_cstring(principals,
2486 k->cert->principals[i])) != 0)
2487 goto out;
2488 }
2489 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2490 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2491 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2492 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0)
2493 goto out;
2494
2495 /* -v01 certs have non-critical options here */
2496 if (!sshkey_cert_is_legacy(k)) {
2497 if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
2498 goto out;
2499 }
2500
2501 /* -v00 certs put the nonce at the end */
2502 if (sshkey_cert_is_legacy(k)) {
2503 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2504 goto out;
2505 }
2506
2507 if ((ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2508 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2509 goto out;
2510
2511 /* Sign the whole mess */
2512 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2513 sshbuf_len(cert), 0)) != 0)
2514 goto out;
2515
2516 /* Append signature and we are done */
2517 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2518 goto out;
2519 ret = 0;
2520 out:
2521 if (ret != 0)
2522 sshbuf_reset(cert);
2523 if (sig_blob != NULL)
2524 free(sig_blob);
2525 if (ca_blob != NULL)
2526 free(ca_blob);
2527 if (principals != NULL)
2528 sshbuf_free(principals);
2529 return ret;
2530}
2531
2532int
2533sshkey_cert_check_authority(const struct sshkey *k,
2534 int want_host, int require_principal,
2535 const char *name, const char **reason)
2536{
2537 u_int i, principal_matches;
2538 time_t now = time(NULL);
2539
2540 if (reason != NULL)
2541 *reason = NULL;
2542
2543 if (want_host) {
2544 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2545 *reason = "Certificate invalid: not a host certificate";
2546 return SSH_ERR_KEY_CERT_INVALID;
2547 }
2548 } else {
2549 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2550 *reason = "Certificate invalid: not a user certificate";
2551 return SSH_ERR_KEY_CERT_INVALID;
2552 }
2553 }
2554 if (now < 0) {
2555 /* yikes - system clock before epoch! */
2556 *reason = "Certificate invalid: not yet valid";
2557 return SSH_ERR_KEY_CERT_INVALID;
2558 }
2559 if ((u_int64_t)now < k->cert->valid_after) {
2560 *reason = "Certificate invalid: not yet valid";
2561 return SSH_ERR_KEY_CERT_INVALID;
2562 }
2563 if ((u_int64_t)now >= k->cert->valid_before) {
2564 *reason = "Certificate invalid: expired";
2565 return SSH_ERR_KEY_CERT_INVALID;
2566 }
2567 if (k->cert->nprincipals == 0) {
2568 if (require_principal) {
2569 *reason = "Certificate lacks principal list";
2570 return SSH_ERR_KEY_CERT_INVALID;
2571 }
2572 } else if (name != NULL) {
2573 principal_matches = 0;
2574 for (i = 0; i < k->cert->nprincipals; i++) {
2575 if (strcmp(name, k->cert->principals[i]) == 0) {
2576 principal_matches = 1;
2577 break;
2578 }
2579 }
2580 if (!principal_matches) {
2581 *reason = "Certificate invalid: name is not a listed "
2582 "principal";
2583 return SSH_ERR_KEY_CERT_INVALID;
2584 }
2585 }
2586 return 0;
2587}
2588
2589int
2590sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2591{
2592 int r = SSH_ERR_INTERNAL_ERROR;
2593
2594 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2595 goto out;
2596 switch (key->type) {
2597#ifdef WITH_OPENSSL
2598 case KEY_RSA:
2599 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2600 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2601 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2602 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2603 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2604 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2605 goto out;
2606 break;
2607 case KEY_RSA_CERT_V00:
2608 case KEY_RSA_CERT:
2609 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2610 r = SSH_ERR_INVALID_ARGUMENT;
2611 goto out;
2612 }
2613 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2614 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2615 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2616 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2617 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2618 goto out;
2619 break;
2620 case KEY_DSA:
2621 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2622 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2623 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2624 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2625 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2626 goto out;
2627 break;
2628 case KEY_DSA_CERT_V00:
2629 case KEY_DSA_CERT:
2630 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2631 r = SSH_ERR_INVALID_ARGUMENT;
2632 goto out;
2633 }
2634 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2635 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2636 goto out;
2637 break;
2638# ifdef OPENSSL_HAS_ECC
2639 case KEY_ECDSA:
2640 if ((r = sshbuf_put_cstring(b,
2641 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2642 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2643 (r = sshbuf_put_bignum2(b,
2644 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2645 goto out;
2646 break;
2647 case KEY_ECDSA_CERT:
2648 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2649 r = SSH_ERR_INVALID_ARGUMENT;
2650 goto out;
2651 }
2652 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2653 (r = sshbuf_put_bignum2(b,
2654 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2655 goto out;
2656 break;
2657# endif /* OPENSSL_HAS_ECC */
2658#endif /* WITH_OPENSSL */
2659 case KEY_ED25519:
2660 if ((r = sshbuf_put_string(b, key->ed25519_pk,
2661 ED25519_PK_SZ)) != 0 ||
2662 (r = sshbuf_put_string(b, key->ed25519_sk,
2663 ED25519_SK_SZ)) != 0)
2664 goto out;
2665 break;
2666 case KEY_ED25519_CERT:
2667 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2668 r = SSH_ERR_INVALID_ARGUMENT;
2669 goto out;
2670 }
2671 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2672 (r = sshbuf_put_string(b, key->ed25519_pk,
2673 ED25519_PK_SZ)) != 0 ||
2674 (r = sshbuf_put_string(b, key->ed25519_sk,
2675 ED25519_SK_SZ)) != 0)
2676 goto out;
2677 break;
2678 default:
2679 r = SSH_ERR_INVALID_ARGUMENT;
2680 goto out;
2681 }
2682 /* success */
2683 r = 0;
2684 out:
2685 return r;
2686}
2687
2688int
2689sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2690{
2691 char *tname = NULL, *curve = NULL;
2692 struct sshkey *k = NULL;
djm@openbsd.org60b18252015-01-26 02:59:11 +00002693 size_t pklen = 0, sklen = 0;
Damien Miller86687062014-07-02 15:28:02 +10002694 int type, r = SSH_ERR_INTERNAL_ERROR;
2695 u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2696#ifdef WITH_OPENSSL
2697 BIGNUM *exponent = NULL;
2698#endif /* WITH_OPENSSL */
2699
2700 if (kp != NULL)
2701 *kp = NULL;
2702 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2703 goto out;
2704 type = sshkey_type_from_name(tname);
2705 switch (type) {
2706#ifdef WITH_OPENSSL
2707 case KEY_DSA:
2708 if ((k = sshkey_new_private(type)) == NULL) {
2709 r = SSH_ERR_ALLOC_FAIL;
2710 goto out;
2711 }
2712 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2713 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2714 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2715 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2716 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2717 goto out;
2718 break;
2719 case KEY_DSA_CERT_V00:
2720 case KEY_DSA_CERT:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002721 if ((r = sshkey_froms(buf, &k)) != 0 ||
Damien Miller86687062014-07-02 15:28:02 +10002722 (r = sshkey_add_private(k)) != 0 ||
2723 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2724 goto out;
2725 break;
2726# ifdef OPENSSL_HAS_ECC
2727 case KEY_ECDSA:
2728 if ((k = sshkey_new_private(type)) == NULL) {
2729 r = SSH_ERR_ALLOC_FAIL;
2730 goto out;
2731 }
2732 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2733 r = SSH_ERR_INVALID_ARGUMENT;
2734 goto out;
2735 }
2736 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2737 goto out;
2738 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2739 r = SSH_ERR_EC_CURVE_MISMATCH;
2740 goto out;
2741 }
2742 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2743 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2744 r = SSH_ERR_LIBCRYPTO_ERROR;
2745 goto out;
2746 }
2747 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2748 (r = sshbuf_get_bignum2(buf, exponent)))
2749 goto out;
2750 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2751 r = SSH_ERR_LIBCRYPTO_ERROR;
2752 goto out;
2753 }
2754 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2755 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2756 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2757 goto out;
2758 break;
2759 case KEY_ECDSA_CERT:
2760 if ((exponent = BN_new()) == NULL) {
2761 r = SSH_ERR_LIBCRYPTO_ERROR;
2762 goto out;
2763 }
djm@openbsd.org60b18252015-01-26 02:59:11 +00002764 if ((r = sshkey_froms(buf, &k)) != 0 ||
Damien Miller86687062014-07-02 15:28:02 +10002765 (r = sshkey_add_private(k)) != 0 ||
2766 (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2767 goto out;
2768 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2769 r = SSH_ERR_LIBCRYPTO_ERROR;
2770 goto out;
2771 }
2772 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2773 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2774 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2775 goto out;
2776 break;
2777# endif /* OPENSSL_HAS_ECC */
2778 case KEY_RSA:
2779 if ((k = sshkey_new_private(type)) == NULL) {
2780 r = SSH_ERR_ALLOC_FAIL;
2781 goto out;
2782 }
2783 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2784 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2785 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2786 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2787 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2788 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2789 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2790 goto out;
2791 break;
2792 case KEY_RSA_CERT_V00:
2793 case KEY_RSA_CERT:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002794 if ((r = sshkey_froms(buf, &k)) != 0 ||
Damien Miller86687062014-07-02 15:28:02 +10002795 (r = sshkey_add_private(k)) != 0 ||
2796 (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2797 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2798 (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2799 (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2800 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2801 goto out;
2802 break;
2803#endif /* WITH_OPENSSL */
2804 case KEY_ED25519:
2805 if ((k = sshkey_new_private(type)) == NULL) {
2806 r = SSH_ERR_ALLOC_FAIL;
2807 goto out;
2808 }
2809 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2810 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2811 goto out;
2812 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2813 r = SSH_ERR_INVALID_FORMAT;
2814 goto out;
2815 }
2816 k->ed25519_pk = ed25519_pk;
2817 k->ed25519_sk = ed25519_sk;
2818 ed25519_pk = ed25519_sk = NULL;
2819 break;
2820 case KEY_ED25519_CERT:
djm@openbsd.org60b18252015-01-26 02:59:11 +00002821 if ((r = sshkey_froms(buf, &k)) != 0 ||
Damien Miller86687062014-07-02 15:28:02 +10002822 (r = sshkey_add_private(k)) != 0 ||
2823 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2824 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2825 goto out;
2826 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2827 r = SSH_ERR_INVALID_FORMAT;
2828 goto out;
2829 }
2830 k->ed25519_pk = ed25519_pk;
2831 k->ed25519_sk = ed25519_sk;
2832 ed25519_pk = ed25519_sk = NULL;
2833 break;
2834 default:
2835 r = SSH_ERR_KEY_TYPE_UNKNOWN;
2836 goto out;
2837 }
2838#ifdef WITH_OPENSSL
2839 /* enable blinding */
2840 switch (k->type) {
2841 case KEY_RSA:
2842 case KEY_RSA_CERT_V00:
2843 case KEY_RSA_CERT:
2844 case KEY_RSA1:
2845 if (RSA_blinding_on(k->rsa, NULL) != 1) {
2846 r = SSH_ERR_LIBCRYPTO_ERROR;
2847 goto out;
2848 }
2849 break;
2850 }
2851#endif /* WITH_OPENSSL */
2852 /* success */
2853 r = 0;
2854 if (kp != NULL) {
2855 *kp = k;
2856 k = NULL;
2857 }
2858 out:
2859 free(tname);
2860 free(curve);
2861#ifdef WITH_OPENSSL
2862 if (exponent != NULL)
2863 BN_clear_free(exponent);
2864#endif /* WITH_OPENSSL */
2865 sshkey_free(k);
2866 if (ed25519_pk != NULL) {
2867 explicit_bzero(ed25519_pk, pklen);
2868 free(ed25519_pk);
2869 }
2870 if (ed25519_sk != NULL) {
2871 explicit_bzero(ed25519_sk, sklen);
2872 free(ed25519_sk);
2873 }
2874 return r;
2875}
2876
2877#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2878int
2879sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2880{
2881 BN_CTX *bnctx;
2882 EC_POINT *nq = NULL;
2883 BIGNUM *order, *x, *y, *tmp;
2884 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2885
2886 if ((bnctx = BN_CTX_new()) == NULL)
2887 return SSH_ERR_ALLOC_FAIL;
2888 BN_CTX_start(bnctx);
2889
2890 /*
2891 * We shouldn't ever hit this case because bignum_get_ecpoint()
2892 * refuses to load GF2m points.
2893 */
2894 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2895 NID_X9_62_prime_field)
2896 goto out;
2897
2898 /* Q != infinity */
2899 if (EC_POINT_is_at_infinity(group, public))
2900 goto out;
2901
2902 if ((x = BN_CTX_get(bnctx)) == NULL ||
2903 (y = BN_CTX_get(bnctx)) == NULL ||
2904 (order = BN_CTX_get(bnctx)) == NULL ||
2905 (tmp = BN_CTX_get(bnctx)) == NULL) {
2906 ret = SSH_ERR_ALLOC_FAIL;
2907 goto out;
2908 }
2909
2910 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2911 if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2912 EC_POINT_get_affine_coordinates_GFp(group, public,
2913 x, y, bnctx) != 1) {
2914 ret = SSH_ERR_LIBCRYPTO_ERROR;
2915 goto out;
2916 }
2917 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2918 BN_num_bits(y) <= BN_num_bits(order) / 2)
2919 goto out;
2920
2921 /* nQ == infinity (n == order of subgroup) */
2922 if ((nq = EC_POINT_new(group)) == NULL) {
2923 ret = SSH_ERR_ALLOC_FAIL;
2924 goto out;
2925 }
2926 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2927 ret = SSH_ERR_LIBCRYPTO_ERROR;
2928 goto out;
2929 }
2930 if (EC_POINT_is_at_infinity(group, nq) != 1)
2931 goto out;
2932
2933 /* x < order - 1, y < order - 1 */
2934 if (!BN_sub(tmp, order, BN_value_one())) {
2935 ret = SSH_ERR_LIBCRYPTO_ERROR;
2936 goto out;
2937 }
2938 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2939 goto out;
2940 ret = 0;
2941 out:
2942 BN_CTX_free(bnctx);
2943 if (nq != NULL)
2944 EC_POINT_free(nq);
2945 return ret;
2946}
2947
2948int
2949sshkey_ec_validate_private(const EC_KEY *key)
2950{
2951 BN_CTX *bnctx;
2952 BIGNUM *order, *tmp;
2953 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2954
2955 if ((bnctx = BN_CTX_new()) == NULL)
2956 return SSH_ERR_ALLOC_FAIL;
2957 BN_CTX_start(bnctx);
2958
2959 if ((order = BN_CTX_get(bnctx)) == NULL ||
2960 (tmp = BN_CTX_get(bnctx)) == NULL) {
2961 ret = SSH_ERR_ALLOC_FAIL;
2962 goto out;
2963 }
2964
2965 /* log2(private) > log2(order)/2 */
2966 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2967 ret = SSH_ERR_LIBCRYPTO_ERROR;
2968 goto out;
2969 }
2970 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2971 BN_num_bits(order) / 2)
2972 goto out;
2973
2974 /* private < order - 1 */
2975 if (!BN_sub(tmp, order, BN_value_one())) {
2976 ret = SSH_ERR_LIBCRYPTO_ERROR;
2977 goto out;
2978 }
2979 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2980 goto out;
2981 ret = 0;
2982 out:
2983 BN_CTX_free(bnctx);
2984 return ret;
2985}
2986
2987void
2988sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2989{
2990 BIGNUM *x, *y;
2991 BN_CTX *bnctx;
2992
2993 if (point == NULL) {
2994 fputs("point=(NULL)\n", stderr);
2995 return;
2996 }
2997 if ((bnctx = BN_CTX_new()) == NULL) {
2998 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2999 return;
3000 }
3001 BN_CTX_start(bnctx);
3002 if ((x = BN_CTX_get(bnctx)) == NULL ||
3003 (y = BN_CTX_get(bnctx)) == NULL) {
3004 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3005 return;
3006 }
3007 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3008 NID_X9_62_prime_field) {
3009 fprintf(stderr, "%s: group is not a prime field\n", __func__);
3010 return;
3011 }
3012 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3013 bnctx) != 1) {
3014 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3015 __func__);
3016 return;
3017 }
3018 fputs("x=", stderr);
3019 BN_print_fp(stderr, x);
3020 fputs("\ny=", stderr);
3021 BN_print_fp(stderr, y);
3022 fputs("\n", stderr);
3023 BN_CTX_free(bnctx);
3024}
3025
3026void
3027sshkey_dump_ec_key(const EC_KEY *key)
3028{
3029 const BIGNUM *exponent;
3030
3031 sshkey_dump_ec_point(EC_KEY_get0_group(key),
3032 EC_KEY_get0_public_key(key));
3033 fputs("exponent=", stderr);
3034 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3035 fputs("(NULL)", stderr);
3036 else
3037 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3038 fputs("\n", stderr);
3039}
3040#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
3041
3042static int
3043sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
3044 const char *passphrase, const char *comment, const char *ciphername,
3045 int rounds)
3046{
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00003047 u_char *cp, *key = NULL, *pubkeyblob = NULL;
Damien Miller86687062014-07-02 15:28:02 +10003048 u_char salt[SALT_LEN];
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00003049 char *b64 = NULL;
Damien Miller86687062014-07-02 15:28:02 +10003050 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3051 u_int check;
3052 int r = SSH_ERR_INTERNAL_ERROR;
3053 struct sshcipher_ctx ciphercontext;
3054 const struct sshcipher *cipher;
3055 const char *kdfname = KDFNAME;
3056 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3057
3058 memset(&ciphercontext, 0, sizeof(ciphercontext));
3059
3060 if (rounds <= 0)
3061 rounds = DEFAULT_ROUNDS;
3062 if (passphrase == NULL || !strlen(passphrase)) {
3063 ciphername = "none";
3064 kdfname = "none";
3065 } else if (ciphername == NULL)
3066 ciphername = DEFAULT_CIPHERNAME;
3067 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
3068 r = SSH_ERR_INVALID_ARGUMENT;
3069 goto out;
3070 }
3071 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3072 r = SSH_ERR_INTERNAL_ERROR;
3073 goto out;
3074 }
3075
3076 if ((kdf = sshbuf_new()) == NULL ||
3077 (encoded = sshbuf_new()) == NULL ||
3078 (encrypted = sshbuf_new()) == NULL) {
3079 r = SSH_ERR_ALLOC_FAIL;
3080 goto out;
3081 }
3082 blocksize = cipher_blocksize(cipher);
3083 keylen = cipher_keylen(cipher);
3084 ivlen = cipher_ivlen(cipher);
3085 authlen = cipher_authlen(cipher);
3086 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3087 r = SSH_ERR_ALLOC_FAIL;
3088 goto out;
3089 }
3090 if (strcmp(kdfname, "bcrypt") == 0) {
3091 arc4random_buf(salt, SALT_LEN);
3092 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3093 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3094 r = SSH_ERR_INVALID_ARGUMENT;
3095 goto out;
3096 }
3097 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3098 (r = sshbuf_put_u32(kdf, rounds)) != 0)
3099 goto out;
3100 } else if (strcmp(kdfname, "none") != 0) {
3101 /* Unsupported KDF type */
3102 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3103 goto out;
3104 }
3105 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3106 key + keylen, ivlen, 1)) != 0)
3107 goto out;
3108
3109 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3110 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3111 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3112 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3113 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3114 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3115 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3116 goto out;
3117
3118 /* set up the buffer that will be encrypted */
3119
3120 /* Random check bytes */
3121 check = arc4random();
3122 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3123 (r = sshbuf_put_u32(encrypted, check)) != 0)
3124 goto out;
3125
3126 /* append private key and comment*/
3127 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3128 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3129 goto out;
3130
3131 /* padding */
3132 i = 0;
3133 while (sshbuf_len(encrypted) % blocksize) {
3134 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3135 goto out;
3136 }
3137
3138 /* length in destination buffer */
3139 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3140 goto out;
3141
3142 /* encrypt */
3143 if ((r = sshbuf_reserve(encoded,
3144 sshbuf_len(encrypted) + authlen, &cp)) != 0)
3145 goto out;
3146 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3147 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3148 goto out;
3149
3150 /* uuencode */
3151 if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3152 r = SSH_ERR_ALLOC_FAIL;
3153 goto out;
3154 }
3155
3156 sshbuf_reset(blob);
3157 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3158 goto out;
3159 for (i = 0; i < strlen(b64); i++) {
3160 if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3161 goto out;
3162 /* insert line breaks */
3163 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3164 goto out;
3165 }
3166 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3167 goto out;
3168 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3169 goto out;
3170
3171 /* success */
3172 r = 0;
3173
3174 out:
3175 sshbuf_free(kdf);
3176 sshbuf_free(encoded);
3177 sshbuf_free(encrypted);
3178 cipher_cleanup(&ciphercontext);
3179 explicit_bzero(salt, sizeof(salt));
3180 if (key != NULL) {
3181 explicit_bzero(key, keylen + ivlen);
3182 free(key);
3183 }
3184 if (pubkeyblob != NULL) {
3185 explicit_bzero(pubkeyblob, pubkeylen);
3186 free(pubkeyblob);
3187 }
3188 if (b64 != NULL) {
3189 explicit_bzero(b64, strlen(b64));
3190 free(b64);
3191 }
3192 return r;
3193}
3194
3195static int
3196sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3197 struct sshkey **keyp, char **commentp)
3198{
3199 char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3200 const struct sshcipher *cipher = NULL;
3201 const u_char *cp;
3202 int r = SSH_ERR_INTERNAL_ERROR;
3203 size_t encoded_len;
3204 size_t i, keylen = 0, ivlen = 0, slen = 0;
3205 struct sshbuf *encoded = NULL, *decoded = NULL;
3206 struct sshbuf *kdf = NULL, *decrypted = NULL;
3207 struct sshcipher_ctx ciphercontext;
3208 struct sshkey *k = NULL;
3209 u_char *key = NULL, *salt = NULL, *dp, pad, last;
3210 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3211
3212 memset(&ciphercontext, 0, sizeof(ciphercontext));
3213 if (keyp != NULL)
3214 *keyp = NULL;
3215 if (commentp != NULL)
3216 *commentp = NULL;
3217
3218 if ((encoded = sshbuf_new()) == NULL ||
3219 (decoded = sshbuf_new()) == NULL ||
3220 (decrypted = sshbuf_new()) == NULL) {
3221 r = SSH_ERR_ALLOC_FAIL;
3222 goto out;
3223 }
3224
3225 /* check preamble */
3226 cp = sshbuf_ptr(blob);
3227 encoded_len = sshbuf_len(blob);
3228 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3229 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3230 r = SSH_ERR_INVALID_FORMAT;
3231 goto out;
3232 }
3233 cp += MARK_BEGIN_LEN;
3234 encoded_len -= MARK_BEGIN_LEN;
3235
3236 /* Look for end marker, removing whitespace as we go */
3237 while (encoded_len > 0) {
3238 if (*cp != '\n' && *cp != '\r') {
3239 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3240 goto out;
3241 }
3242 last = *cp;
3243 encoded_len--;
3244 cp++;
3245 if (last == '\n') {
3246 if (encoded_len >= MARK_END_LEN &&
3247 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3248 /* \0 terminate */
3249 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3250 goto out;
3251 break;
3252 }
3253 }
3254 }
3255 if (encoded_len == 0) {
3256 r = SSH_ERR_INVALID_FORMAT;
3257 goto out;
3258 }
3259
3260 /* decode base64 */
djm@openbsd.org3cc1fbb2014-10-08 21:45:48 +00003261 if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
Damien Miller86687062014-07-02 15:28:02 +10003262 goto out;
3263
3264 /* check magic */
3265 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3266 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3267 r = SSH_ERR_INVALID_FORMAT;
3268 goto out;
3269 }
3270 /* parse public portion of key */
3271 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3272 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3273 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3274 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3275 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3276 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3277 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3278 goto out;
3279
3280 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3281 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3282 goto out;
3283 }
3284 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3285 strcmp(ciphername, "none") != 0) {
3286 /* passphrase required */
3287 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3288 goto out;
3289 }
3290 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3291 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3292 goto out;
3293 }
3294 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3295 r = SSH_ERR_INVALID_FORMAT;
3296 goto out;
3297 }
3298 if (nkeys != 1) {
3299 /* XXX only one key supported */
3300 r = SSH_ERR_INVALID_FORMAT;
3301 goto out;
3302 }
3303
3304 /* check size of encrypted key blob */
3305 blocksize = cipher_blocksize(cipher);
3306 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3307 r = SSH_ERR_INVALID_FORMAT;
3308 goto out;
3309 }
3310
3311 /* setup key */
3312 keylen = cipher_keylen(cipher);
3313 ivlen = cipher_ivlen(cipher);
3314 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3315 r = SSH_ERR_ALLOC_FAIL;
3316 goto out;
3317 }
3318 if (strcmp(kdfname, "bcrypt") == 0) {
3319 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3320 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3321 goto out;
3322 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3323 key, keylen + ivlen, rounds) < 0) {
3324 r = SSH_ERR_INVALID_FORMAT;
3325 goto out;
3326 }
3327 }
3328
3329 /* decrypt private portion of key */
3330 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3331 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3332 key + keylen, ivlen, 0)) != 0)
3333 goto out;
3334 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3335 sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 0) {
3336 /* an integrity error here indicates an incorrect passphrase */
3337 if (r == SSH_ERR_MAC_INVALID)
3338 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3339 goto out;
3340 }
3341 if ((r = sshbuf_consume(decoded, encrypted_len)) != 0)
3342 goto out;
3343 /* there should be no trailing data */
3344 if (sshbuf_len(decoded) != 0) {
3345 r = SSH_ERR_INVALID_FORMAT;
3346 goto out;
3347 }
3348
3349 /* check check bytes */
3350 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3351 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3352 goto out;
3353 if (check1 != check2) {
3354 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3355 goto out;
3356 }
3357
3358 /* Load the private key and comment */
3359 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3360 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3361 goto out;
3362
3363 /* Check deterministic padding */
3364 i = 0;
3365 while (sshbuf_len(decrypted)) {
3366 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3367 goto out;
3368 if (pad != (++i & 0xff)) {
3369 r = SSH_ERR_INVALID_FORMAT;
3370 goto out;
3371 }
3372 }
3373
3374 /* XXX decode pubkey and check against private */
3375
3376 /* success */
3377 r = 0;
3378 if (keyp != NULL) {
3379 *keyp = k;
3380 k = NULL;
3381 }
3382 if (commentp != NULL) {
3383 *commentp = comment;
3384 comment = NULL;
3385 }
3386 out:
3387 pad = 0;
3388 cipher_cleanup(&ciphercontext);
3389 free(ciphername);
3390 free(kdfname);
3391 free(comment);
3392 if (salt != NULL) {
3393 explicit_bzero(salt, slen);
3394 free(salt);
3395 }
3396 if (key != NULL) {
3397 explicit_bzero(key, keylen + ivlen);
3398 free(key);
3399 }
3400 sshbuf_free(encoded);
3401 sshbuf_free(decoded);
3402 sshbuf_free(kdf);
3403 sshbuf_free(decrypted);
3404 sshkey_free(k);
3405 return r;
3406}
3407
3408#if WITH_SSH1
3409/*
3410 * Serialises the authentication (private) key to a blob, encrypting it with
3411 * passphrase. The identification of the blob (lowest 64 bits of n) will
3412 * precede the key to provide identification of the key without needing a
3413 * passphrase.
3414 */
3415static int
3416sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3417 const char *passphrase, const char *comment)
3418{
3419 struct sshbuf *buffer = NULL, *encrypted = NULL;
3420 u_char buf[8];
3421 int r, cipher_num;
3422 struct sshcipher_ctx ciphercontext;
3423 const struct sshcipher *cipher;
3424 u_char *cp;
3425
3426 /*
3427 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3428 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3429 */
3430 cipher_num = (strcmp(passphrase, "") == 0) ?
3431 SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3432 if ((cipher = cipher_by_number(cipher_num)) == NULL)
3433 return SSH_ERR_INTERNAL_ERROR;
3434
3435 /* This buffer is used to build the secret part of the private key. */
3436 if ((buffer = sshbuf_new()) == NULL)
3437 return SSH_ERR_ALLOC_FAIL;
3438
3439 /* Put checkbytes for checking passphrase validity. */
3440 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3441 goto out;
3442 arc4random_buf(cp, 2);
3443 memcpy(cp + 2, cp, 2);
3444
3445 /*
3446 * Store the private key (n and e will not be stored because they
3447 * will be stored in plain text, and storing them also in encrypted
3448 * format would just give known plaintext).
3449 * Note: q and p are stored in reverse order to SSL.
3450 */
3451 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3452 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3453 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3454 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3455 goto out;
3456
3457 /* Pad the part to be encrypted to a size that is a multiple of 8. */
3458 explicit_bzero(buf, 8);
3459 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3460 goto out;
3461
3462 /* This buffer will be used to contain the data in the file. */
3463 if ((encrypted = sshbuf_new()) == NULL) {
3464 r = SSH_ERR_ALLOC_FAIL;
3465 goto out;
3466 }
3467
3468 /* First store keyfile id string. */
3469 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3470 sizeof(LEGACY_BEGIN))) != 0)
3471 goto out;
3472
3473 /* Store cipher type and "reserved" field. */
3474 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3475 (r = sshbuf_put_u32(encrypted, 0)) != 0)
3476 goto out;
3477
3478 /* Store public key. This will be in plain text. */
3479 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3480 (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3481 (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3482 (r = sshbuf_put_cstring(encrypted, comment) != 0))
3483 goto out;
3484
3485 /* Allocate space for the private part of the key in the buffer. */
3486 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3487 goto out;
3488
3489 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3490 CIPHER_ENCRYPT)) != 0)
3491 goto out;
3492 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3493 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3494 goto out;
3495 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3496 goto out;
3497
3498 r = sshbuf_putb(blob, encrypted);
3499
3500 out:
3501 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3502 explicit_bzero(buf, sizeof(buf));
3503 if (buffer != NULL)
3504 sshbuf_free(buffer);
3505 if (encrypted != NULL)
3506 sshbuf_free(encrypted);
3507
3508 return r;
3509}
3510#endif /* WITH_SSH1 */
3511
3512#ifdef WITH_OPENSSL
3513/* convert SSH v2 key in OpenSSL PEM format */
3514static int
3515sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3516 const char *_passphrase, const char *comment)
3517{
3518 int success, r;
3519 int blen, len = strlen(_passphrase);
3520 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3521#if (OPENSSL_VERSION_NUMBER < 0x00907000L)
3522 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
3523#else
3524 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3525#endif
3526 const u_char *bptr;
3527 BIO *bio = NULL;
3528
3529 if (len > 0 && len <= 4)
3530 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3531 if ((bio = BIO_new(BIO_s_mem())) == NULL)
3532 return SSH_ERR_ALLOC_FAIL;
3533
3534 switch (key->type) {
3535 case KEY_DSA:
3536 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3537 cipher, passphrase, len, NULL, NULL);
3538 break;
3539#ifdef OPENSSL_HAS_ECC
3540 case KEY_ECDSA:
3541 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3542 cipher, passphrase, len, NULL, NULL);
3543 break;
3544#endif
3545 case KEY_RSA:
3546 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3547 cipher, passphrase, len, NULL, NULL);
3548 break;
3549 default:
3550 success = 0;
3551 break;
3552 }
3553 if (success == 0) {
3554 r = SSH_ERR_LIBCRYPTO_ERROR;
3555 goto out;
3556 }
3557 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3558 r = SSH_ERR_INTERNAL_ERROR;
3559 goto out;
3560 }
3561 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3562 goto out;
3563 r = 0;
3564 out:
3565 BIO_free(bio);
3566 return r;
3567}
3568#endif /* WITH_OPENSSL */
3569
3570/* Serialise "key" to buffer "blob" */
3571int
3572sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3573 const char *passphrase, const char *comment,
3574 int force_new_format, const char *new_format_cipher, int new_format_rounds)
3575{
3576 switch (key->type) {
markus@openbsd.orgf067cca2015-01-12 13:29:27 +00003577#ifdef WITH_SSH1
Damien Miller86687062014-07-02 15:28:02 +10003578 case KEY_RSA1:
3579 return sshkey_private_rsa1_to_blob(key, blob,
3580 passphrase, comment);
markus@openbsd.orgf067cca2015-01-12 13:29:27 +00003581#endif /* WITH_SSH1 */
3582#ifdef WITH_OPENSSL
Damien Miller86687062014-07-02 15:28:02 +10003583 case KEY_DSA:
3584 case KEY_ECDSA:
3585 case KEY_RSA:
3586 if (force_new_format) {
3587 return sshkey_private_to_blob2(key, blob, passphrase,
3588 comment, new_format_cipher, new_format_rounds);
3589 }
3590 return sshkey_private_pem_to_blob(key, blob,
3591 passphrase, comment);
3592#endif /* WITH_OPENSSL */
3593 case KEY_ED25519:
3594 return sshkey_private_to_blob2(key, blob, passphrase,
3595 comment, new_format_cipher, new_format_rounds);
3596 default:
3597 return SSH_ERR_KEY_TYPE_UNKNOWN;
3598 }
3599}
3600
3601#ifdef WITH_SSH1
3602/*
3603 * Parse the public, unencrypted portion of a RSA1 key.
3604 */
3605int
3606sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3607 struct sshkey **keyp, char **commentp)
3608{
3609 int r;
3610 struct sshkey *pub = NULL;
3611 struct sshbuf *copy = NULL;
3612
3613 if (keyp != NULL)
3614 *keyp = NULL;
3615 if (commentp != NULL)
3616 *commentp = NULL;
3617
3618 /* Check that it is at least big enough to contain the ID string. */
3619 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3620 return SSH_ERR_INVALID_FORMAT;
3621
3622 /*
3623 * Make sure it begins with the id string. Consume the id string
3624 * from the buffer.
3625 */
3626 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3627 return SSH_ERR_INVALID_FORMAT;
3628 /* Make a working copy of the keyblob and skip past the magic */
3629 if ((copy = sshbuf_fromb(blob)) == NULL)
3630 return SSH_ERR_ALLOC_FAIL;
3631 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3632 goto out;
3633
3634 /* Skip cipher type, reserved data and key bits. */
3635 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3636 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3637 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3638 goto out;
3639
3640 /* Read the public key from the buffer. */
3641 if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3642 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3643 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3644 goto out;
3645
3646 /* Finally, the comment */
3647 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3648 goto out;
3649
3650 /* The encrypted private part is not parsed by this function. */
3651
3652 r = 0;
3653 if (keyp != NULL)
3654 *keyp = pub;
3655 else
3656 sshkey_free(pub);
3657 pub = NULL;
3658
3659 out:
3660 if (copy != NULL)
3661 sshbuf_free(copy);
3662 if (pub != NULL)
3663 sshkey_free(pub);
3664 return r;
3665}
3666
3667static int
3668sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3669 struct sshkey **keyp, char **commentp)
3670{
3671 int r;
3672 u_int16_t check1, check2;
3673 u_int8_t cipher_type;
3674 struct sshbuf *decrypted = NULL, *copy = NULL;
3675 u_char *cp;
3676 char *comment = NULL;
3677 struct sshcipher_ctx ciphercontext;
3678 const struct sshcipher *cipher;
3679 struct sshkey *prv = NULL;
3680
3681 *keyp = NULL;
3682 if (commentp != NULL)
3683 *commentp = NULL;
3684
3685 /* Check that it is at least big enough to contain the ID string. */
3686 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3687 return SSH_ERR_INVALID_FORMAT;
3688
3689 /*
3690 * Make sure it begins with the id string. Consume the id string
3691 * from the buffer.
3692 */
3693 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3694 return SSH_ERR_INVALID_FORMAT;
3695
3696 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3697 r = SSH_ERR_ALLOC_FAIL;
3698 goto out;
3699 }
3700 if ((copy = sshbuf_fromb(blob)) == NULL ||
3701 (decrypted = sshbuf_new()) == NULL) {
3702 r = SSH_ERR_ALLOC_FAIL;
3703 goto out;
3704 }
3705 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3706 goto out;
3707
3708 /* Read cipher type. */
3709 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3710 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3711 goto out;
3712
3713 /* Read the public key and comment from the buffer. */
3714 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3715 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3716 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3717 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3718 goto out;
3719
3720 /* Check that it is a supported cipher. */
3721 cipher = cipher_by_number(cipher_type);
3722 if (cipher == NULL) {
3723 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3724 goto out;
3725 }
3726 /* Initialize space for decrypted data. */
3727 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3728 goto out;
3729
3730 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3731 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3732 CIPHER_DECRYPT)) != 0)
3733 goto out;
3734 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3735 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3736 cipher_cleanup(&ciphercontext);
3737 goto out;
3738 }
3739 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3740 goto out;
3741
3742 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3743 (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3744 goto out;
3745 if (check1 != check2) {
3746 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3747 goto out;
3748 }
3749
3750 /* Read the rest of the private key. */
3751 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3752 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3753 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3754 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3755 goto out;
3756
3757 /* calculate p-1 and q-1 */
3758 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3759 goto out;
3760
3761 /* enable blinding */
3762 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3763 r = SSH_ERR_LIBCRYPTO_ERROR;
3764 goto out;
3765 }
3766 r = 0;
3767 *keyp = prv;
3768 prv = NULL;
3769 if (commentp != NULL) {
3770 *commentp = comment;
3771 comment = NULL;
3772 }
3773 out:
3774 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3775 if (comment != NULL)
3776 free(comment);
3777 if (prv != NULL)
3778 sshkey_free(prv);
3779 if (copy != NULL)
3780 sshbuf_free(copy);
3781 if (decrypted != NULL)
3782 sshbuf_free(decrypted);
3783 return r;
3784}
3785#endif /* WITH_SSH1 */
3786
3787#ifdef WITH_OPENSSL
djm@openbsd.org1195f4c2015-01-08 10:14:08 +00003788static int
Damien Miller86687062014-07-02 15:28:02 +10003789sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
djm@openbsd.org1195f4c2015-01-08 10:14:08 +00003790 const char *passphrase, struct sshkey **keyp)
Damien Miller86687062014-07-02 15:28:02 +10003791{
3792 EVP_PKEY *pk = NULL;
3793 struct sshkey *prv = NULL;
Damien Miller86687062014-07-02 15:28:02 +10003794 BIO *bio = NULL;
3795 int r;
3796
3797 *keyp = NULL;
Damien Miller86687062014-07-02 15:28:02 +10003798
3799 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3800 return SSH_ERR_ALLOC_FAIL;
3801 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3802 (int)sshbuf_len(blob)) {
3803 r = SSH_ERR_ALLOC_FAIL;
3804 goto out;
3805 }
3806
3807 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3808 (char *)passphrase)) == NULL) {
3809 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3810 goto out;
3811 }
3812 if (pk->type == EVP_PKEY_RSA &&
3813 (type == KEY_UNSPEC || type == KEY_RSA)) {
3814 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3815 r = SSH_ERR_ALLOC_FAIL;
3816 goto out;
3817 }
3818 prv->rsa = EVP_PKEY_get1_RSA(pk);
3819 prv->type = KEY_RSA;
Damien Miller86687062014-07-02 15:28:02 +10003820#ifdef DEBUG_PK
3821 RSA_print_fp(stderr, prv->rsa, 8);
3822#endif
3823 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3824 r = SSH_ERR_LIBCRYPTO_ERROR;
3825 goto out;
3826 }
3827 } else if (pk->type == EVP_PKEY_DSA &&
3828 (type == KEY_UNSPEC || type == KEY_DSA)) {
3829 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3830 r = SSH_ERR_ALLOC_FAIL;
3831 goto out;
3832 }
3833 prv->dsa = EVP_PKEY_get1_DSA(pk);
3834 prv->type = KEY_DSA;
Damien Miller86687062014-07-02 15:28:02 +10003835#ifdef DEBUG_PK
3836 DSA_print_fp(stderr, prv->dsa, 8);
3837#endif
3838#ifdef OPENSSL_HAS_ECC
3839 } else if (pk->type == EVP_PKEY_EC &&
3840 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3841 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3842 r = SSH_ERR_ALLOC_FAIL;
3843 goto out;
3844 }
3845 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3846 prv->type = KEY_ECDSA;
3847 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3848 if (prv->ecdsa_nid == -1 ||
3849 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3850 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3851 EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3852 sshkey_ec_validate_private(prv->ecdsa) != 0) {
3853 r = SSH_ERR_INVALID_FORMAT;
3854 goto out;
3855 }
Damien Miller86687062014-07-02 15:28:02 +10003856# ifdef DEBUG_PK
3857 if (prv != NULL && prv->ecdsa != NULL)
3858 sshkey_dump_ec_key(prv->ecdsa);
3859# endif
3860#endif /* OPENSSL_HAS_ECC */
3861 } else {
3862 r = SSH_ERR_INVALID_FORMAT;
3863 goto out;
3864 }
Damien Miller86687062014-07-02 15:28:02 +10003865 r = 0;
3866 *keyp = prv;
3867 prv = NULL;
3868 out:
3869 BIO_free(bio);
3870 if (pk != NULL)
3871 EVP_PKEY_free(pk);
3872 if (prv != NULL)
3873 sshkey_free(prv);
3874 return r;
3875}
3876#endif /* WITH_OPENSSL */
3877
3878int
3879sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3880 const char *passphrase, struct sshkey **keyp, char **commentp)
3881{
3882 int r;
3883
3884 *keyp = NULL;
3885 if (commentp != NULL)
3886 *commentp = NULL;
3887
3888 switch (type) {
markus@openbsd.orgf067cca2015-01-12 13:29:27 +00003889#ifdef WITH_SSH1
Damien Miller86687062014-07-02 15:28:02 +10003890 case KEY_RSA1:
3891 return sshkey_parse_private_rsa1(blob, passphrase,
3892 keyp, commentp);
markus@openbsd.orgf067cca2015-01-12 13:29:27 +00003893#endif /* WITH_SSH1 */
3894#ifdef WITH_OPENSSL
Damien Miller86687062014-07-02 15:28:02 +10003895 case KEY_DSA:
3896 case KEY_ECDSA:
3897 case KEY_RSA:
djm@openbsd.org1195f4c2015-01-08 10:14:08 +00003898 return sshkey_parse_private_pem_fileblob(blob, type,
3899 passphrase, keyp);
Damien Miller86687062014-07-02 15:28:02 +10003900#endif /* WITH_OPENSSL */
3901 case KEY_ED25519:
3902 return sshkey_parse_private2(blob, type, passphrase,
3903 keyp, commentp);
3904 case KEY_UNSPEC:
3905 if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3906 commentp)) == 0)
3907 return 0;
3908#ifdef WITH_OPENSSL
djm@openbsd.org1195f4c2015-01-08 10:14:08 +00003909 return sshkey_parse_private_pem_fileblob(blob, type,
3910 passphrase, keyp);
Damien Miller86687062014-07-02 15:28:02 +10003911#else
3912 return SSH_ERR_INVALID_FORMAT;
3913#endif /* WITH_OPENSSL */
3914 default:
3915 return SSH_ERR_KEY_TYPE_UNKNOWN;
3916 }
3917}
3918
3919int
3920sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3921 const char *filename, struct sshkey **keyp, char **commentp)
3922{
3923 int r;
3924
3925 if (keyp != NULL)
3926 *keyp = NULL;
3927 if (commentp != NULL)
3928 *commentp = NULL;
3929
3930#ifdef WITH_SSH1
3931 /* it's a SSH v1 key if the public key part is readable */
3932 if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3933 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3934 passphrase, keyp, commentp);
3935 }
3936#endif /* WITH_SSH1 */
3937 if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3938 passphrase, keyp, commentp)) == 0)
3939 return 0;
3940 return r;
3941}