1 /* $OpenBSD: sshkey.c,v 1.66 2018/07/03 13:20:25 djm Exp $ */
2 /*
3 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4 * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5 * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "includes.h"
29
30 #include <sys/types.h>
31 #include <netinet/in.h>
32
33 #ifdef WITH_OPENSSL
34 #include <openssl/evp.h>
35 #include <openssl/err.h>
36 #include <openssl/pem.h>
37 #endif
38
39 #include "crypto_api.h"
40
41 #include <errno.h>
42 #include <limits.h>
43 #include <stdio.h>
44 #include <string.h>
45 #include <resolv.h>
46 #ifdef HAVE_UTIL_H
47 #include <util.h>
48 #endif /* HAVE_UTIL_H */
49
50 #include "ssh2.h"
51 #include "ssherr.h"
52 #include "misc.h"
53 #include "sshbuf.h"
54 #include "cipher.h"
55 #include "digest.h"
56 #define SSHKEY_INTERNAL
57 #include "sshkey.h"
58 #include "sshkey-xmss.h"
59 #include "match.h"
60
61 #include "xmss_fast.h"
62
63 #include "openbsd-compat/openssl-compat.h"
64
65 /* openssh private key file format */
66 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
67 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
68 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
69 #define MARK_END_LEN (sizeof(MARK_END) - 1)
70 #define KDFNAME "bcrypt"
71 #define AUTH_MAGIC "openssh-key-v1"
72 #define SALT_LEN 16
73 #define DEFAULT_CIPHERNAME "aes256-ctr"
74 #define DEFAULT_ROUNDS 16
75
76 /* Version identification string for SSH v1 identity files. */
77 #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
78
79 int sshkey_private_serialize_opt(const struct sshkey *key,
80 struct sshbuf *buf, enum sshkey_serialize_rep);
81 static int sshkey_from_blob_internal(struct sshbuf *buf,
82 struct sshkey **keyp, int allow_cert);
83
84 /* Supported key types */
85 struct keytype {
86 const char *name;
87 const char *shortname;
88 const char *sigalg;
89 int type;
90 int nid;
91 int cert;
92 int sigonly;
93 };
94 static const struct keytype keytypes[] = {
95 { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 },
96 { "[email protected]", "ED25519-CERT", NULL,
97 KEY_ED25519_CERT, 0, 1, 0 },
98 #ifdef WITH_XMSS
99 { "[email protected]", "XMSS", NULL, KEY_XMSS, 0, 0, 0 },
100 { "[email protected]", "XMSS-CERT", NULL,
101 KEY_XMSS_CERT, 0, 1, 0 },
102 #endif /* WITH_XMSS */
103 #ifdef WITH_OPENSSL
104 { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 },
105 { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 },
106 { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 },
107 { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 },
108 # ifdef OPENSSL_HAS_ECC
109 { "ecdsa-sha2-nistp256", "ECDSA", NULL,
110 KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
111 { "ecdsa-sha2-nistp384", "ECDSA", NULL,
112 KEY_ECDSA, NID_secp384r1, 0, 0 },
113 # ifdef OPENSSL_HAS_NISTP521
114 { "ecdsa-sha2-nistp521", "ECDSA", NULL,
115 KEY_ECDSA, NID_secp521r1, 0, 0 },
116 # endif /* OPENSSL_HAS_NISTP521 */
117 # endif /* OPENSSL_HAS_ECC */
118 { "[email protected]", "RSA-CERT", NULL,
119 KEY_RSA_CERT, 0, 1, 0 },
120 { "[email protected]", "RSA-CERT",
121 "ssh-rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
122 { "[email protected]", "RSA-CERT",
123 "ssh-rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
124 { "[email protected]", "DSA-CERT", NULL,
125 KEY_DSA_CERT, 0, 1, 0 },
126 { "[email protected]", "RSA-CERT", NULL,
127 KEY_RSA_CERT, 0, 1, 0 },
128 { "[email protected]", "RSA-CERT",
129 "ssh-rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
130 { "[email protected]", "RSA-CERT",
131 "ssh-rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
132 { "[email protected]", "DSA-CERT", NULL,
133 KEY_DSA_CERT, 0, 1, 0 },
134 # ifdef OPENSSL_HAS_ECC
135 { "[email protected]", "ECDSA-CERT", NULL,
136 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
137 { "[email protected]", "ECDSA-CERT", NULL,
138 KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
139 # ifdef OPENSSL_HAS_NISTP521
140 { "[email protected]", "ECDSA-CERT", NULL,
141 KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
142 # endif /* OPENSSL_HAS_NISTP521 */
143 # endif /* OPENSSL_HAS_ECC */
144 #endif /* WITH_OPENSSL */
145 { NULL, NULL, NULL, -1, -1, 0, 0 }
146 };
147
148 const char *
sshkey_type(const struct sshkey * k)149 sshkey_type(const struct sshkey *k)
150 {
151 const struct keytype *kt;
152
153 for (kt = keytypes; kt->type != -1; kt++) {
154 if (kt->type == k->type)
155 return kt->shortname;
156 }
157 return "unknown";
158 }
159
160 static const char *
sshkey_ssh_name_from_type_nid(int type,int nid)161 sshkey_ssh_name_from_type_nid(int type, int nid)
162 {
163 const struct keytype *kt;
164
165 for (kt = keytypes; kt->type != -1; kt++) {
166 if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
167 return kt->name;
168 }
169 return "ssh-unknown";
170 }
171
172 int
sshkey_type_is_cert(int type)173 sshkey_type_is_cert(int type)
174 {
175 const struct keytype *kt;
176
177 for (kt = keytypes; kt->type != -1; kt++) {
178 if (kt->type == type)
179 return kt->cert;
180 }
181 return 0;
182 }
183
184 const char *
sshkey_ssh_name(const struct sshkey * k)185 sshkey_ssh_name(const struct sshkey *k)
186 {
187 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
188 }
189
190 const char *
sshkey_ssh_name_plain(const struct sshkey * k)191 sshkey_ssh_name_plain(const struct sshkey *k)
192 {
193 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
194 k->ecdsa_nid);
195 }
196
197 int
sshkey_type_from_name(const char * name)198 sshkey_type_from_name(const char *name)
199 {
200 const struct keytype *kt;
201
202 for (kt = keytypes; kt->type != -1; kt++) {
203 /* Only allow shortname matches for plain key types */
204 if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
205 (!kt->cert && strcasecmp(kt->shortname, name) == 0))
206 return kt->type;
207 }
208 return KEY_UNSPEC;
209 }
210
211 int
sshkey_ecdsa_nid_from_name(const char * name)212 sshkey_ecdsa_nid_from_name(const char *name)
213 {
214 const struct keytype *kt;
215
216 for (kt = keytypes; kt->type != -1; kt++) {
217 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
218 continue;
219 if (kt->name != NULL && strcmp(name, kt->name) == 0)
220 return kt->nid;
221 }
222 return -1;
223 }
224
225 char *
sshkey_alg_list(int certs_only,int plain_only,int include_sigonly,char sep)226 sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
227 {
228 char *tmp, *ret = NULL;
229 size_t nlen, rlen = 0;
230 const struct keytype *kt;
231
232 for (kt = keytypes; kt->type != -1; kt++) {
233 if (kt->name == NULL)
234 continue;
235 if (!include_sigonly && kt->sigonly)
236 continue;
237 if ((certs_only && !kt->cert) || (plain_only && kt->cert))
238 continue;
239 if (ret != NULL)
240 ret[rlen++] = sep;
241 nlen = strlen(kt->name);
242 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
243 free(ret);
244 return NULL;
245 }
246 ret = tmp;
247 memcpy(ret + rlen, kt->name, nlen + 1);
248 rlen += nlen;
249 }
250 return ret;
251 }
252
253 int
sshkey_names_valid2(const char * names,int allow_wildcard)254 sshkey_names_valid2(const char *names, int allow_wildcard)
255 {
256 char *s, *cp, *p;
257 const struct keytype *kt;
258 int type;
259
260 if (names == NULL || strcmp(names, "") == 0)
261 return 0;
262 if ((s = cp = strdup(names)) == NULL)
263 return 0;
264 for ((p = strsep(&cp, ",")); p && *p != '\0';
265 (p = strsep(&cp, ","))) {
266 type = sshkey_type_from_name(p);
267 if (type == KEY_UNSPEC) {
268 if (allow_wildcard) {
269 /*
270 * Try matching key types against the string.
271 * If any has a positive or negative match then
272 * the component is accepted.
273 */
274 for (kt = keytypes; kt->type != -1; kt++) {
275 if (match_pattern_list(kt->name,
276 p, 0) != 0)
277 break;
278 }
279 if (kt->type != -1)
280 continue;
281 }
282 free(s);
283 return 0;
284 }
285 }
286 free(s);
287 return 1;
288 }
289
290 u_int
sshkey_size(const struct sshkey * k)291 sshkey_size(const struct sshkey *k)
292 {
293 #ifdef WITH_OPENSSL
294 const BIGNUM *rsa_n, *dsa_p;
295 #endif /* WITH_OPENSSL */
296
297 switch (k->type) {
298 #ifdef WITH_OPENSSL
299 case KEY_RSA:
300 case KEY_RSA_CERT:
301 if (k->rsa == NULL)
302 return 0;
303 RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
304 return BN_num_bits(rsa_n);
305 case KEY_DSA:
306 case KEY_DSA_CERT:
307 if (k->dsa == NULL)
308 return 0;
309 DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL);
310 return BN_num_bits(dsa_p);
311 case KEY_ECDSA:
312 case KEY_ECDSA_CERT:
313 return sshkey_curve_nid_to_bits(k->ecdsa_nid);
314 #endif /* WITH_OPENSSL */
315 case KEY_ED25519:
316 case KEY_ED25519_CERT:
317 case KEY_XMSS:
318 case KEY_XMSS_CERT:
319 return 256; /* XXX */
320 }
321 return 0;
322 }
323
324 static int
sshkey_type_is_valid_ca(int type)325 sshkey_type_is_valid_ca(int type)
326 {
327 switch (type) {
328 case KEY_RSA:
329 case KEY_DSA:
330 case KEY_ECDSA:
331 case KEY_ED25519:
332 case KEY_XMSS:
333 return 1;
334 default:
335 return 0;
336 }
337 }
338
339 int
sshkey_is_cert(const struct sshkey * k)340 sshkey_is_cert(const struct sshkey *k)
341 {
342 if (k == NULL)
343 return 0;
344 return sshkey_type_is_cert(k->type);
345 }
346
347 /* Return the cert-less equivalent to a certified key type */
348 int
sshkey_type_plain(int type)349 sshkey_type_plain(int type)
350 {
351 switch (type) {
352 case KEY_RSA_CERT:
353 return KEY_RSA;
354 case KEY_DSA_CERT:
355 return KEY_DSA;
356 case KEY_ECDSA_CERT:
357 return KEY_ECDSA;
358 case KEY_ED25519_CERT:
359 return KEY_ED25519;
360 case KEY_XMSS_CERT:
361 return KEY_XMSS;
362 default:
363 return type;
364 }
365 }
366
367 #ifdef WITH_OPENSSL
368 /* XXX: these are really begging for a table-driven approach */
369 int
sshkey_curve_name_to_nid(const char * name)370 sshkey_curve_name_to_nid(const char *name)
371 {
372 if (strcmp(name, "nistp256") == 0)
373 return NID_X9_62_prime256v1;
374 else if (strcmp(name, "nistp384") == 0)
375 return NID_secp384r1;
376 # ifdef OPENSSL_HAS_NISTP521
377 else if (strcmp(name, "nistp521") == 0)
378 return NID_secp521r1;
379 # endif /* OPENSSL_HAS_NISTP521 */
380 else
381 return -1;
382 }
383
384 u_int
sshkey_curve_nid_to_bits(int nid)385 sshkey_curve_nid_to_bits(int nid)
386 {
387 switch (nid) {
388 case NID_X9_62_prime256v1:
389 return 256;
390 case NID_secp384r1:
391 return 384;
392 # ifdef OPENSSL_HAS_NISTP521
393 case NID_secp521r1:
394 return 521;
395 # endif /* OPENSSL_HAS_NISTP521 */
396 default:
397 return 0;
398 }
399 }
400
401 int
sshkey_ecdsa_bits_to_nid(int bits)402 sshkey_ecdsa_bits_to_nid(int bits)
403 {
404 switch (bits) {
405 case 256:
406 return NID_X9_62_prime256v1;
407 case 384:
408 return NID_secp384r1;
409 # ifdef OPENSSL_HAS_NISTP521
410 case 521:
411 return NID_secp521r1;
412 # endif /* OPENSSL_HAS_NISTP521 */
413 default:
414 return -1;
415 }
416 }
417
418 const char *
sshkey_curve_nid_to_name(int nid)419 sshkey_curve_nid_to_name(int nid)
420 {
421 switch (nid) {
422 case NID_X9_62_prime256v1:
423 return "nistp256";
424 case NID_secp384r1:
425 return "nistp384";
426 # ifdef OPENSSL_HAS_NISTP521
427 case NID_secp521r1:
428 return "nistp521";
429 # endif /* OPENSSL_HAS_NISTP521 */
430 default:
431 return NULL;
432 }
433 }
434
435 int
sshkey_ec_nid_to_hash_alg(int nid)436 sshkey_ec_nid_to_hash_alg(int nid)
437 {
438 int kbits = sshkey_curve_nid_to_bits(nid);
439
440 if (kbits <= 0)
441 return -1;
442
443 /* RFC5656 section 6.2.1 */
444 if (kbits <= 256)
445 return SSH_DIGEST_SHA256;
446 else if (kbits <= 384)
447 return SSH_DIGEST_SHA384;
448 else
449 return SSH_DIGEST_SHA512;
450 }
451 #endif /* WITH_OPENSSL */
452
453 static void
cert_free(struct sshkey_cert * cert)454 cert_free(struct sshkey_cert *cert)
455 {
456 u_int i;
457
458 if (cert == NULL)
459 return;
460 sshbuf_free(cert->certblob);
461 sshbuf_free(cert->critical);
462 sshbuf_free(cert->extensions);
463 free(cert->key_id);
464 for (i = 0; i < cert->nprincipals; i++)
465 free(cert->principals[i]);
466 free(cert->principals);
467 sshkey_free(cert->signature_key);
468 freezero(cert, sizeof(*cert));
469 }
470
471 static struct sshkey_cert *
cert_new(void)472 cert_new(void)
473 {
474 struct sshkey_cert *cert;
475
476 if ((cert = calloc(1, sizeof(*cert))) == NULL)
477 return NULL;
478 if ((cert->certblob = sshbuf_new()) == NULL ||
479 (cert->critical = sshbuf_new()) == NULL ||
480 (cert->extensions = sshbuf_new()) == NULL) {
481 cert_free(cert);
482 return NULL;
483 }
484 cert->key_id = NULL;
485 cert->principals = NULL;
486 cert->signature_key = NULL;
487 return cert;
488 }
489
490 struct sshkey *
sshkey_new(int type)491 sshkey_new(int type)
492 {
493 struct sshkey *k;
494 #ifdef WITH_OPENSSL
495 RSA *rsa;
496 DSA *dsa;
497 #endif /* WITH_OPENSSL */
498
499 if ((k = calloc(1, sizeof(*k))) == NULL)
500 return NULL;
501 k->type = type;
502 k->ecdsa = NULL;
503 k->ecdsa_nid = -1;
504 k->dsa = NULL;
505 k->rsa = NULL;
506 k->cert = NULL;
507 k->ed25519_sk = NULL;
508 k->ed25519_pk = NULL;
509 k->xmss_sk = NULL;
510 k->xmss_pk = NULL;
511 switch (k->type) {
512 #ifdef WITH_OPENSSL
513 case KEY_RSA:
514 case KEY_RSA_CERT:
515 if ((rsa = RSA_new()) == NULL) {
516 free(k);
517 return NULL;
518 }
519 k->rsa = rsa;
520 break;
521 case KEY_DSA:
522 case KEY_DSA_CERT:
523 if ((dsa = DSA_new()) == NULL) {
524 free(k);
525 return NULL;
526 }
527 k->dsa = dsa;
528 break;
529 case KEY_ECDSA:
530 case KEY_ECDSA_CERT:
531 /* Cannot do anything until we know the group */
532 break;
533 #endif /* WITH_OPENSSL */
534 case KEY_ED25519:
535 case KEY_ED25519_CERT:
536 case KEY_XMSS:
537 case KEY_XMSS_CERT:
538 /* no need to prealloc */
539 break;
540 case KEY_UNSPEC:
541 break;
542 default:
543 free(k);
544 return NULL;
545 }
546
547 if (sshkey_is_cert(k)) {
548 if ((k->cert = cert_new()) == NULL) {
549 sshkey_free(k);
550 return NULL;
551 }
552 }
553
554 return k;
555 }
556
557 /* XXX garbage-collect this API */
558 struct sshkey *
sshkey_new_private(int type)559 sshkey_new_private(int type)
560 {
561 struct sshkey *k = sshkey_new(type);
562
563 if (k == NULL)
564 return NULL;
565 return k;
566 }
567
568 void
sshkey_free(struct sshkey * k)569 sshkey_free(struct sshkey *k)
570 {
571 if (k == NULL)
572 return;
573 switch (k->type) {
574 #ifdef WITH_OPENSSL
575 case KEY_RSA:
576 case KEY_RSA_CERT:
577 RSA_free(k->rsa);
578 k->rsa = NULL;
579 break;
580 case KEY_DSA:
581 case KEY_DSA_CERT:
582 DSA_free(k->dsa);
583 k->dsa = NULL;
584 break;
585 # ifdef OPENSSL_HAS_ECC
586 case KEY_ECDSA:
587 case KEY_ECDSA_CERT:
588 EC_KEY_free(k->ecdsa);
589 k->ecdsa = NULL;
590 break;
591 # endif /* OPENSSL_HAS_ECC */
592 #endif /* WITH_OPENSSL */
593 case KEY_ED25519:
594 case KEY_ED25519_CERT:
595 freezero(k->ed25519_pk, ED25519_PK_SZ);
596 k->ed25519_pk = NULL;
597 freezero(k->ed25519_sk, ED25519_SK_SZ);
598 k->ed25519_sk = NULL;
599 break;
600 #ifdef WITH_XMSS
601 case KEY_XMSS:
602 case KEY_XMSS_CERT:
603 freezero(k->xmss_pk, sshkey_xmss_pklen(k));
604 k->xmss_pk = NULL;
605 freezero(k->xmss_sk, sshkey_xmss_sklen(k));
606 k->xmss_sk = NULL;
607 sshkey_xmss_free_state(k);
608 free(k->xmss_name);
609 k->xmss_name = NULL;
610 free(k->xmss_filename);
611 k->xmss_filename = NULL;
612 break;
613 #endif /* WITH_XMSS */
614 case KEY_UNSPEC:
615 break;
616 default:
617 break;
618 }
619 if (sshkey_is_cert(k))
620 cert_free(k->cert);
621 freezero(k, sizeof(*k));
622 }
623
624 static int
cert_compare(struct sshkey_cert * a,struct sshkey_cert * b)625 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
626 {
627 if (a == NULL && b == NULL)
628 return 1;
629 if (a == NULL || b == NULL)
630 return 0;
631 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
632 return 0;
633 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
634 sshbuf_len(a->certblob)) != 0)
635 return 0;
636 return 1;
637 }
638
639 /*
640 * Compare public portions of key only, allowing comparisons between
641 * certificates and plain keys too.
642 */
643 int
sshkey_equal_public(const struct sshkey * a,const struct sshkey * b)644 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
645 {
646 #if defined(WITH_OPENSSL)
647 const BIGNUM *rsa_e_a, *rsa_n_a;
648 const BIGNUM *rsa_e_b, *rsa_n_b;
649 const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
650 const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
651 # if defined(OPENSSL_HAS_ECC)
652 BN_CTX *bnctx;
653 # endif /* OPENSSL_HAS_ECC */
654 #endif /* WITH_OPENSSL */
655
656 if (a == NULL || b == NULL ||
657 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
658 return 0;
659
660 switch (a->type) {
661 #ifdef WITH_OPENSSL
662 case KEY_RSA_CERT:
663 case KEY_RSA:
664 if (a->rsa == NULL || b->rsa == NULL)
665 return 0;
666 RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
667 RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
668 return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
669 BN_cmp(rsa_n_a, rsa_n_b) == 0;
670 case KEY_DSA_CERT:
671 case KEY_DSA:
672 if (a->dsa == NULL || b->dsa == NULL)
673 return 0;
674 DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
675 DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
676 DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
677 DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
678 return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
679 BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
680 BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
681 BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
682 # ifdef OPENSSL_HAS_ECC
683 case KEY_ECDSA_CERT:
684 case KEY_ECDSA:
685 if (a->ecdsa == NULL || b->ecdsa == NULL ||
686 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
687 EC_KEY_get0_public_key(b->ecdsa) == NULL)
688 return 0;
689 if ((bnctx = BN_CTX_new()) == NULL)
690 return 0;
691 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
692 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
693 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
694 EC_KEY_get0_public_key(a->ecdsa),
695 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
696 BN_CTX_free(bnctx);
697 return 0;
698 }
699 BN_CTX_free(bnctx);
700 return 1;
701 # endif /* OPENSSL_HAS_ECC */
702 #endif /* WITH_OPENSSL */
703 case KEY_ED25519:
704 case KEY_ED25519_CERT:
705 return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
706 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
707 #ifdef WITH_XMSS
708 case KEY_XMSS:
709 case KEY_XMSS_CERT:
710 return a->xmss_pk != NULL && b->xmss_pk != NULL &&
711 sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
712 memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
713 #endif /* WITH_XMSS */
714 default:
715 return 0;
716 }
717 /* NOTREACHED */
718 }
719
720 int
sshkey_equal(const struct sshkey * a,const struct sshkey * b)721 sshkey_equal(const struct sshkey *a, const struct sshkey *b)
722 {
723 if (a == NULL || b == NULL || a->type != b->type)
724 return 0;
725 if (sshkey_is_cert(a)) {
726 if (!cert_compare(a->cert, b->cert))
727 return 0;
728 }
729 return sshkey_equal_public(a, b);
730 }
731
732 static int
to_blob_buf(const struct sshkey * key,struct sshbuf * b,int force_plain,enum sshkey_serialize_rep opts)733 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
734 enum sshkey_serialize_rep opts)
735 {
736 int type, ret = SSH_ERR_INTERNAL_ERROR;
737 const char *typename;
738 #ifdef WITH_OPENSSL
739 const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
740 #endif /* WITH_OPENSSL */
741
742 if (key == NULL)
743 return SSH_ERR_INVALID_ARGUMENT;
744
745 if (sshkey_is_cert(key)) {
746 if (key->cert == NULL)
747 return SSH_ERR_EXPECTED_CERT;
748 if (sshbuf_len(key->cert->certblob) == 0)
749 return SSH_ERR_KEY_LACKS_CERTBLOB;
750 }
751 type = force_plain ? sshkey_type_plain(key->type) : key->type;
752 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
753
754 switch (type) {
755 #ifdef WITH_OPENSSL
756 case KEY_DSA_CERT:
757 case KEY_ECDSA_CERT:
758 case KEY_RSA_CERT:
759 #endif /* WITH_OPENSSL */
760 case KEY_ED25519_CERT:
761 #ifdef WITH_XMSS
762 case KEY_XMSS_CERT:
763 #endif /* WITH_XMSS */
764 /* Use the existing blob */
765 /* XXX modified flag? */
766 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
767 return ret;
768 break;
769 #ifdef WITH_OPENSSL
770 case KEY_DSA:
771 if (key->dsa == NULL)
772 return SSH_ERR_INVALID_ARGUMENT;
773 DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
774 DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
775 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
776 (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
777 (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
778 (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
779 (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
780 return ret;
781 break;
782 # ifdef OPENSSL_HAS_ECC
783 case KEY_ECDSA:
784 if (key->ecdsa == NULL)
785 return SSH_ERR_INVALID_ARGUMENT;
786 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
787 (ret = sshbuf_put_cstring(b,
788 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
789 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
790 return ret;
791 break;
792 # endif
793 case KEY_RSA:
794 if (key->rsa == NULL)
795 return SSH_ERR_INVALID_ARGUMENT;
796 RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
797 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
798 (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
799 (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
800 return ret;
801 break;
802 #endif /* WITH_OPENSSL */
803 case KEY_ED25519:
804 if (key->ed25519_pk == NULL)
805 return SSH_ERR_INVALID_ARGUMENT;
806 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
807 (ret = sshbuf_put_string(b,
808 key->ed25519_pk, ED25519_PK_SZ)) != 0)
809 return ret;
810 break;
811 #ifdef WITH_XMSS
812 case KEY_XMSS:
813 if (key->xmss_name == NULL || key->xmss_pk == NULL ||
814 sshkey_xmss_pklen(key) == 0)
815 return SSH_ERR_INVALID_ARGUMENT;
816 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
817 (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
818 (ret = sshbuf_put_string(b,
819 key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
820 (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
821 return ret;
822 break;
823 #endif /* WITH_XMSS */
824 default:
825 return SSH_ERR_KEY_TYPE_UNKNOWN;
826 }
827 return 0;
828 }
829
830 int
sshkey_putb(const struct sshkey * key,struct sshbuf * b)831 sshkey_putb(const struct sshkey *key, struct sshbuf *b)
832 {
833 return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
834 }
835
836 int
sshkey_puts_opts(const struct sshkey * key,struct sshbuf * b,enum sshkey_serialize_rep opts)837 sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
838 enum sshkey_serialize_rep opts)
839 {
840 struct sshbuf *tmp;
841 int r;
842
843 if ((tmp = sshbuf_new()) == NULL)
844 return SSH_ERR_ALLOC_FAIL;
845 r = to_blob_buf(key, tmp, 0, opts);
846 if (r == 0)
847 r = sshbuf_put_stringb(b, tmp);
848 sshbuf_free(tmp);
849 return r;
850 }
851
852 int
sshkey_puts(const struct sshkey * key,struct sshbuf * b)853 sshkey_puts(const struct sshkey *key, struct sshbuf *b)
854 {
855 return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
856 }
857
858 int
sshkey_putb_plain(const struct sshkey * key,struct sshbuf * b)859 sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
860 {
861 return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
862 }
863
864 static int
to_blob(const struct sshkey * key,u_char ** blobp,size_t * lenp,int force_plain,enum sshkey_serialize_rep opts)865 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
866 enum sshkey_serialize_rep opts)
867 {
868 int ret = SSH_ERR_INTERNAL_ERROR;
869 size_t len;
870 struct sshbuf *b = NULL;
871
872 if (lenp != NULL)
873 *lenp = 0;
874 if (blobp != NULL)
875 *blobp = NULL;
876 if ((b = sshbuf_new()) == NULL)
877 return SSH_ERR_ALLOC_FAIL;
878 if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
879 goto out;
880 len = sshbuf_len(b);
881 if (lenp != NULL)
882 *lenp = len;
883 if (blobp != NULL) {
884 if ((*blobp = malloc(len)) == NULL) {
885 ret = SSH_ERR_ALLOC_FAIL;
886 goto out;
887 }
888 memcpy(*blobp, sshbuf_ptr(b), len);
889 }
890 ret = 0;
891 out:
892 sshbuf_free(b);
893 return ret;
894 }
895
896 int
sshkey_to_blob(const struct sshkey * key,u_char ** blobp,size_t * lenp)897 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
898 {
899 return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
900 }
901
902 int
sshkey_plain_to_blob(const struct sshkey * key,u_char ** blobp,size_t * lenp)903 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
904 {
905 return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
906 }
907
908 int
sshkey_fingerprint_raw(const struct sshkey * k,int dgst_alg,u_char ** retp,size_t * lenp)909 sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
910 u_char **retp, size_t *lenp)
911 {
912 u_char *blob = NULL, *ret = NULL;
913 size_t blob_len = 0;
914 int r = SSH_ERR_INTERNAL_ERROR;
915
916 if (retp != NULL)
917 *retp = NULL;
918 if (lenp != NULL)
919 *lenp = 0;
920 if (ssh_digest_bytes(dgst_alg) == 0) {
921 r = SSH_ERR_INVALID_ARGUMENT;
922 goto out;
923 }
924 if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
925 != 0)
926 goto out;
927 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
928 r = SSH_ERR_ALLOC_FAIL;
929 goto out;
930 }
931 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
932 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
933 goto out;
934 /* success */
935 if (retp != NULL) {
936 *retp = ret;
937 ret = NULL;
938 }
939 if (lenp != NULL)
940 *lenp = ssh_digest_bytes(dgst_alg);
941 r = 0;
942 out:
943 free(ret);
944 if (blob != NULL) {
945 explicit_bzero(blob, blob_len);
946 free(blob);
947 }
948 return r;
949 }
950
951 static char *
fingerprint_b64(const char * alg,u_char * dgst_raw,size_t dgst_raw_len)952 fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
953 {
954 char *ret;
955 size_t plen = strlen(alg) + 1;
956 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
957 int r;
958
959 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
960 return NULL;
961 strlcpy(ret, alg, rlen);
962 strlcat(ret, ":", rlen);
963 if (dgst_raw_len == 0)
964 return ret;
965 if ((r = b64_ntop(dgst_raw, dgst_raw_len,
966 ret + plen, rlen - plen)) == -1) {
967 freezero(ret, rlen);
968 return NULL;
969 }
970 /* Trim padding characters from end */
971 ret[strcspn(ret, "=")] = '\0';
972 return ret;
973 }
974
975 static char *
fingerprint_hex(const char * alg,u_char * dgst_raw,size_t dgst_raw_len)976 fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
977 {
978 char *retval, hex[5];
979 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
980
981 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
982 return NULL;
983 strlcpy(retval, alg, rlen);
984 strlcat(retval, ":", rlen);
985 for (i = 0; i < dgst_raw_len; i++) {
986 snprintf(hex, sizeof(hex), "%s%02x",
987 i > 0 ? ":" : "", dgst_raw[i]);
988 strlcat(retval, hex, rlen);
989 }
990 return retval;
991 }
992
993 static char *
fingerprint_bubblebabble(u_char * dgst_raw,size_t dgst_raw_len)994 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
995 {
996 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
997 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
998 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
999 u_int i, j = 0, rounds, seed = 1;
1000 char *retval;
1001
1002 rounds = (dgst_raw_len / 2) + 1;
1003 if ((retval = calloc(rounds, 6)) == NULL)
1004 return NULL;
1005 retval[j++] = 'x';
1006 for (i = 0; i < rounds; i++) {
1007 u_int idx0, idx1, idx2, idx3, idx4;
1008 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1009 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1010 seed) % 6;
1011 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1012 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1013 (seed / 6)) % 6;
1014 retval[j++] = vowels[idx0];
1015 retval[j++] = consonants[idx1];
1016 retval[j++] = vowels[idx2];
1017 if ((i + 1) < rounds) {
1018 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1019 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1020 retval[j++] = consonants[idx3];
1021 retval[j++] = '-';
1022 retval[j++] = consonants[idx4];
1023 seed = ((seed * 5) +
1024 ((((u_int)(dgst_raw[2 * i])) * 7) +
1025 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1026 }
1027 } else {
1028 idx0 = seed % 6;
1029 idx1 = 16;
1030 idx2 = seed / 6;
1031 retval[j++] = vowels[idx0];
1032 retval[j++] = consonants[idx1];
1033 retval[j++] = vowels[idx2];
1034 }
1035 }
1036 retval[j++] = 'x';
1037 retval[j++] = '\0';
1038 return retval;
1039 }
1040
1041 /*
1042 * Draw an ASCII-Art representing the fingerprint so human brain can
1043 * profit from its built-in pattern recognition ability.
1044 * This technique is called "random art" and can be found in some
1045 * scientific publications like this original paper:
1046 *
1047 * "Hash Visualization: a New Technique to improve Real-World Security",
1048 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1049 * Techniques and E-Commerce (CrypTEC '99)
1050 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1051 *
1052 * The subject came up in a talk by Dan Kaminsky, too.
1053 *
1054 * If you see the picture is different, the key is different.
1055 * If the picture looks the same, you still know nothing.
1056 *
1057 * The algorithm used here is a worm crawling over a discrete plane,
1058 * leaving a trace (augmenting the field) everywhere it goes.
1059 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1060 * makes the respective movement vector be ignored for this turn.
1061 * Graphs are not unambiguous, because circles in graphs can be
1062 * walked in either direction.
1063 */
1064
1065 /*
1066 * Field sizes for the random art. Have to be odd, so the starting point
1067 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1068 * Else pictures would be too dense, and drawing the frame would
1069 * fail, too, because the key type would not fit in anymore.
1070 */
1071 #define FLDBASE 8
1072 #define FLDSIZE_Y (FLDBASE + 1)
1073 #define FLDSIZE_X (FLDBASE * 2 + 1)
1074 static char *
fingerprint_randomart(const char * alg,u_char * dgst_raw,size_t dgst_raw_len,const struct sshkey * k)1075 fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1076 const struct sshkey *k)
1077 {
1078 /*
1079 * Chars to be used after each other every time the worm
1080 * intersects with itself. Matter of taste.
1081 */
1082 char *augmentation_string = " .o+=*BOX@%&#/^SE";
1083 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1084 u_char field[FLDSIZE_X][FLDSIZE_Y];
1085 size_t i, tlen, hlen;
1086 u_int b;
1087 int x, y, r;
1088 size_t len = strlen(augmentation_string) - 1;
1089
1090 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1091 return NULL;
1092
1093 /* initialize field */
1094 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1095 x = FLDSIZE_X / 2;
1096 y = FLDSIZE_Y / 2;
1097
1098 /* process raw key */
1099 for (i = 0; i < dgst_raw_len; i++) {
1100 int input;
1101 /* each byte conveys four 2-bit move commands */
1102 input = dgst_raw[i];
1103 for (b = 0; b < 4; b++) {
1104 /* evaluate 2 bit, rest is shifted later */
1105 x += (input & 0x1) ? 1 : -1;
1106 y += (input & 0x2) ? 1 : -1;
1107
1108 /* assure we are still in bounds */
1109 x = MAXIMUM(x, 0);
1110 y = MAXIMUM(y, 0);
1111 x = MINIMUM(x, FLDSIZE_X - 1);
1112 y = MINIMUM(y, FLDSIZE_Y - 1);
1113
1114 /* augment the field */
1115 if (field[x][y] < len - 2)
1116 field[x][y]++;
1117 input = input >> 2;
1118 }
1119 }
1120
1121 /* mark starting point and end point*/
1122 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1123 field[x][y] = len;
1124
1125 /* assemble title */
1126 r = snprintf(title, sizeof(title), "[%s %u]",
1127 sshkey_type(k), sshkey_size(k));
1128 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1129 if (r < 0 || r > (int)sizeof(title))
1130 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1131 tlen = (r <= 0) ? 0 : strlen(title);
1132
1133 /* assemble hash ID. */
1134 r = snprintf(hash, sizeof(hash), "[%s]", alg);
1135 hlen = (r <= 0) ? 0 : strlen(hash);
1136
1137 /* output upper border */
1138 p = retval;
1139 *p++ = '+';
1140 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1141 *p++ = '-';
1142 memcpy(p, title, tlen);
1143 p += tlen;
1144 for (i += tlen; i < FLDSIZE_X; i++)
1145 *p++ = '-';
1146 *p++ = '+';
1147 *p++ = '\n';
1148
1149 /* output content */
1150 for (y = 0; y < FLDSIZE_Y; y++) {
1151 *p++ = '|';
1152 for (x = 0; x < FLDSIZE_X; x++)
1153 *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1154 *p++ = '|';
1155 *p++ = '\n';
1156 }
1157
1158 /* output lower border */
1159 *p++ = '+';
1160 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1161 *p++ = '-';
1162 memcpy(p, hash, hlen);
1163 p += hlen;
1164 for (i += hlen; i < FLDSIZE_X; i++)
1165 *p++ = '-';
1166 *p++ = '+';
1167
1168 return retval;
1169 }
1170
1171 char *
sshkey_fingerprint(const struct sshkey * k,int dgst_alg,enum sshkey_fp_rep dgst_rep)1172 sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1173 enum sshkey_fp_rep dgst_rep)
1174 {
1175 char *retval = NULL;
1176 u_char *dgst_raw;
1177 size_t dgst_raw_len;
1178
1179 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1180 return NULL;
1181 switch (dgst_rep) {
1182 case SSH_FP_DEFAULT:
1183 if (dgst_alg == SSH_DIGEST_MD5) {
1184 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1185 dgst_raw, dgst_raw_len);
1186 } else {
1187 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1188 dgst_raw, dgst_raw_len);
1189 }
1190 break;
1191 case SSH_FP_HEX:
1192 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1193 dgst_raw, dgst_raw_len);
1194 break;
1195 case SSH_FP_BASE64:
1196 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1197 dgst_raw, dgst_raw_len);
1198 break;
1199 case SSH_FP_BUBBLEBABBLE:
1200 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1201 break;
1202 case SSH_FP_RANDOMART:
1203 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1204 dgst_raw, dgst_raw_len, k);
1205 break;
1206 default:
1207 explicit_bzero(dgst_raw, dgst_raw_len);
1208 free(dgst_raw);
1209 return NULL;
1210 }
1211 explicit_bzero(dgst_raw, dgst_raw_len);
1212 free(dgst_raw);
1213 return retval;
1214 }
1215
1216 static int
peek_type_nid(const char * s,size_t l,int * nid)1217 peek_type_nid(const char *s, size_t l, int *nid)
1218 {
1219 const struct keytype *kt;
1220
1221 for (kt = keytypes; kt->type != -1; kt++) {
1222 if (kt->name == NULL || strlen(kt->name) != l)
1223 continue;
1224 if (memcmp(s, kt->name, l) == 0) {
1225 *nid = -1;
1226 if (kt->type == KEY_ECDSA || kt->type == KEY_ECDSA_CERT)
1227 *nid = kt->nid;
1228 return kt->type;
1229 }
1230 }
1231 return KEY_UNSPEC;
1232 }
1233
1234 /* XXX this can now be made const char * */
1235 int
sshkey_read(struct sshkey * ret,char ** cpp)1236 sshkey_read(struct sshkey *ret, char **cpp)
1237 {
1238 struct sshkey *k;
1239 char *cp, *blobcopy;
1240 size_t space;
1241 int r, type, curve_nid = -1;
1242 struct sshbuf *blob;
1243
1244 if (ret == NULL)
1245 return SSH_ERR_INVALID_ARGUMENT;
1246
1247 switch (ret->type) {
1248 case KEY_UNSPEC:
1249 case KEY_RSA:
1250 case KEY_DSA:
1251 case KEY_ECDSA:
1252 case KEY_ED25519:
1253 case KEY_DSA_CERT:
1254 case KEY_ECDSA_CERT:
1255 case KEY_RSA_CERT:
1256 case KEY_ED25519_CERT:
1257 #ifdef WITH_XMSS
1258 case KEY_XMSS:
1259 case KEY_XMSS_CERT:
1260 #endif /* WITH_XMSS */
1261 break; /* ok */
1262 default:
1263 return SSH_ERR_INVALID_ARGUMENT;
1264 }
1265
1266 /* Decode type */
1267 cp = *cpp;
1268 space = strcspn(cp, " \t");
1269 if (space == strlen(cp))
1270 return SSH_ERR_INVALID_FORMAT;
1271 if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1272 return SSH_ERR_INVALID_FORMAT;
1273
1274 /* skip whitespace */
1275 for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1276 ;
1277 if (*cp == '\0')
1278 return SSH_ERR_INVALID_FORMAT;
1279 if (ret->type != KEY_UNSPEC && ret->type != type)
1280 return SSH_ERR_KEY_TYPE_MISMATCH;
1281 if ((blob = sshbuf_new()) == NULL)
1282 return SSH_ERR_ALLOC_FAIL;
1283
1284 /* find end of keyblob and decode */
1285 space = strcspn(cp, " \t");
1286 if ((blobcopy = strndup(cp, space)) == NULL) {
1287 sshbuf_free(blob);
1288 return SSH_ERR_ALLOC_FAIL;
1289 }
1290 if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1291 free(blobcopy);
1292 sshbuf_free(blob);
1293 return r;
1294 }
1295 free(blobcopy);
1296 if ((r = sshkey_fromb(blob, &k)) != 0) {
1297 sshbuf_free(blob);
1298 return r;
1299 }
1300 sshbuf_free(blob);
1301
1302 /* skip whitespace and leave cp at start of comment */
1303 for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1304 ;
1305
1306 /* ensure type of blob matches type at start of line */
1307 if (k->type != type) {
1308 sshkey_free(k);
1309 return SSH_ERR_KEY_TYPE_MISMATCH;
1310 }
1311 if (sshkey_type_plain(type) == KEY_ECDSA && curve_nid != k->ecdsa_nid) {
1312 sshkey_free(k);
1313 return SSH_ERR_EC_CURVE_MISMATCH;
1314 }
1315
1316 /* Fill in ret from parsed key */
1317 ret->type = type;
1318 if (sshkey_is_cert(ret)) {
1319 if (!sshkey_is_cert(k)) {
1320 sshkey_free(k);
1321 return SSH_ERR_EXPECTED_CERT;
1322 }
1323 if (ret->cert != NULL)
1324 cert_free(ret->cert);
1325 ret->cert = k->cert;
1326 k->cert = NULL;
1327 }
1328 switch (sshkey_type_plain(ret->type)) {
1329 #ifdef WITH_OPENSSL
1330 case KEY_RSA:
1331 RSA_free(ret->rsa);
1332 ret->rsa = k->rsa;
1333 k->rsa = NULL;
1334 #ifdef DEBUG_PK
1335 RSA_print_fp(stderr, ret->rsa, 8);
1336 #endif
1337 break;
1338 case KEY_DSA:
1339 DSA_free(ret->dsa);
1340 ret->dsa = k->dsa;
1341 k->dsa = NULL;
1342 #ifdef DEBUG_PK
1343 DSA_print_fp(stderr, ret->dsa, 8);
1344 #endif
1345 break;
1346 # ifdef OPENSSL_HAS_ECC
1347 case KEY_ECDSA:
1348 EC_KEY_free(ret->ecdsa);
1349 ret->ecdsa = k->ecdsa;
1350 ret->ecdsa_nid = k->ecdsa_nid;
1351 k->ecdsa = NULL;
1352 k->ecdsa_nid = -1;
1353 #ifdef DEBUG_PK
1354 sshkey_dump_ec_key(ret->ecdsa);
1355 #endif
1356 break;
1357 # endif /* OPENSSL_HAS_ECC */
1358 #endif /* WITH_OPENSSL */
1359 case KEY_ED25519:
1360 freezero(ret->ed25519_pk, ED25519_PK_SZ);
1361 ret->ed25519_pk = k->ed25519_pk;
1362 k->ed25519_pk = NULL;
1363 #ifdef DEBUG_PK
1364 /* XXX */
1365 #endif
1366 break;
1367 #ifdef WITH_XMSS
1368 case KEY_XMSS:
1369 free(ret->xmss_pk);
1370 ret->xmss_pk = k->xmss_pk;
1371 k->xmss_pk = NULL;
1372 free(ret->xmss_state);
1373 ret->xmss_state = k->xmss_state;
1374 k->xmss_state = NULL;
1375 free(ret->xmss_name);
1376 ret->xmss_name = k->xmss_name;
1377 k->xmss_name = NULL;
1378 free(ret->xmss_filename);
1379 ret->xmss_filename = k->xmss_filename;
1380 k->xmss_filename = NULL;
1381 #ifdef DEBUG_PK
1382 /* XXX */
1383 #endif
1384 break;
1385 #endif /* WITH_XMSS */
1386 default:
1387 sshkey_free(k);
1388 return SSH_ERR_INTERNAL_ERROR;
1389 }
1390 sshkey_free(k);
1391
1392 /* success */
1393 *cpp = cp;
1394 return 0;
1395 }
1396
1397
1398 int
sshkey_to_base64(const struct sshkey * key,char ** b64p)1399 sshkey_to_base64(const struct sshkey *key, char **b64p)
1400 {
1401 int r = SSH_ERR_INTERNAL_ERROR;
1402 struct sshbuf *b = NULL;
1403 char *uu = NULL;
1404
1405 if (b64p != NULL)
1406 *b64p = NULL;
1407 if ((b = sshbuf_new()) == NULL)
1408 return SSH_ERR_ALLOC_FAIL;
1409 if ((r = sshkey_putb(key, b)) != 0)
1410 goto out;
1411 if ((uu = sshbuf_dtob64(b)) == NULL) {
1412 r = SSH_ERR_ALLOC_FAIL;
1413 goto out;
1414 }
1415 /* Success */
1416 if (b64p != NULL) {
1417 *b64p = uu;
1418 uu = NULL;
1419 }
1420 r = 0;
1421 out:
1422 sshbuf_free(b);
1423 free(uu);
1424 return r;
1425 }
1426
1427 int
sshkey_format_text(const struct sshkey * key,struct sshbuf * b)1428 sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1429 {
1430 int r = SSH_ERR_INTERNAL_ERROR;
1431 char *uu = NULL;
1432
1433 if ((r = sshkey_to_base64(key, &uu)) != 0)
1434 goto out;
1435 if ((r = sshbuf_putf(b, "%s %s",
1436 sshkey_ssh_name(key), uu)) != 0)
1437 goto out;
1438 r = 0;
1439 out:
1440 free(uu);
1441 return r;
1442 }
1443
1444 int
sshkey_write(const struct sshkey * key,FILE * f)1445 sshkey_write(const struct sshkey *key, FILE *f)
1446 {
1447 struct sshbuf *b = NULL;
1448 int r = SSH_ERR_INTERNAL_ERROR;
1449
1450 if ((b = sshbuf_new()) == NULL)
1451 return SSH_ERR_ALLOC_FAIL;
1452 if ((r = sshkey_format_text(key, b)) != 0)
1453 goto out;
1454 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1455 if (feof(f))
1456 errno = EPIPE;
1457 r = SSH_ERR_SYSTEM_ERROR;
1458 goto out;
1459 }
1460 /* Success */
1461 r = 0;
1462 out:
1463 sshbuf_free(b);
1464 return r;
1465 }
1466
1467 const char *
sshkey_cert_type(const struct sshkey * k)1468 sshkey_cert_type(const struct sshkey *k)
1469 {
1470 switch (k->cert->type) {
1471 case SSH2_CERT_TYPE_USER:
1472 return "user";
1473 case SSH2_CERT_TYPE_HOST:
1474 return "host";
1475 default:
1476 return "unknown";
1477 }
1478 }
1479
1480 #ifdef WITH_OPENSSL
1481 static int
rsa_generate_private_key(u_int bits,RSA ** rsap)1482 rsa_generate_private_key(u_int bits, RSA **rsap)
1483 {
1484 RSA *private = NULL;
1485 BIGNUM *f4 = NULL;
1486 int ret = SSH_ERR_INTERNAL_ERROR;
1487
1488 if (rsap == NULL)
1489 return SSH_ERR_INVALID_ARGUMENT;
1490 if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1491 bits > SSHBUF_MAX_BIGNUM * 8)
1492 return SSH_ERR_KEY_LENGTH;
1493 *rsap = NULL;
1494 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1495 ret = SSH_ERR_ALLOC_FAIL;
1496 goto out;
1497 }
1498 if (!BN_set_word(f4, RSA_F4) ||
1499 !RSA_generate_key_ex(private, bits, f4, NULL)) {
1500 ret = SSH_ERR_LIBCRYPTO_ERROR;
1501 goto out;
1502 }
1503 *rsap = private;
1504 private = NULL;
1505 ret = 0;
1506 out:
1507 RSA_free(private);
1508 BN_free(f4);
1509 return ret;
1510 }
1511
1512 static int
dsa_generate_private_key(u_int bits,DSA ** dsap)1513 dsa_generate_private_key(u_int bits, DSA **dsap)
1514 {
1515 DSA *private;
1516 int ret = SSH_ERR_INTERNAL_ERROR;
1517
1518 if (dsap == NULL)
1519 return SSH_ERR_INVALID_ARGUMENT;
1520 if (bits != 1024)
1521 return SSH_ERR_KEY_LENGTH;
1522 if ((private = DSA_new()) == NULL) {
1523 ret = SSH_ERR_ALLOC_FAIL;
1524 goto out;
1525 }
1526 *dsap = NULL;
1527 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1528 NULL, NULL) || !DSA_generate_key(private)) {
1529 ret = SSH_ERR_LIBCRYPTO_ERROR;
1530 goto out;
1531 }
1532 *dsap = private;
1533 private = NULL;
1534 ret = 0;
1535 out:
1536 DSA_free(private);
1537 return ret;
1538 }
1539
1540 # ifdef OPENSSL_HAS_ECC
1541 int
sshkey_ecdsa_key_to_nid(EC_KEY * k)1542 sshkey_ecdsa_key_to_nid(EC_KEY *k)
1543 {
1544 EC_GROUP *eg;
1545 int nids[] = {
1546 NID_X9_62_prime256v1,
1547 NID_secp384r1,
1548 # ifdef OPENSSL_HAS_NISTP521
1549 NID_secp521r1,
1550 # endif /* OPENSSL_HAS_NISTP521 */
1551 -1
1552 };
1553 int nid;
1554 u_int i;
1555 BN_CTX *bnctx;
1556 const EC_GROUP *g = EC_KEY_get0_group(k);
1557
1558 /*
1559 * The group may be stored in a ASN.1 encoded private key in one of two
1560 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1561 * or explicit group parameters encoded into the key blob. Only the
1562 * "named group" case sets the group NID for us, but we can figure
1563 * it out for the other case by comparing against all the groups that
1564 * are supported.
1565 */
1566 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1567 return nid;
1568 if ((bnctx = BN_CTX_new()) == NULL)
1569 return -1;
1570 for (i = 0; nids[i] != -1; i++) {
1571 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1572 BN_CTX_free(bnctx);
1573 return -1;
1574 }
1575 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1576 break;
1577 EC_GROUP_free(eg);
1578 }
1579 BN_CTX_free(bnctx);
1580 if (nids[i] != -1) {
1581 /* Use the group with the NID attached */
1582 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1583 if (EC_KEY_set_group(k, eg) != 1) {
1584 EC_GROUP_free(eg);
1585 return -1;
1586 }
1587 }
1588 return nids[i];
1589 }
1590
1591 static int
ecdsa_generate_private_key(u_int bits,int * nid,EC_KEY ** ecdsap)1592 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1593 {
1594 EC_KEY *private;
1595 int ret = SSH_ERR_INTERNAL_ERROR;
1596
1597 if (nid == NULL || ecdsap == NULL)
1598 return SSH_ERR_INVALID_ARGUMENT;
1599 if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1600 return SSH_ERR_KEY_LENGTH;
1601 *ecdsap = NULL;
1602 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1603 ret = SSH_ERR_ALLOC_FAIL;
1604 goto out;
1605 }
1606 if (EC_KEY_generate_key(private) != 1) {
1607 ret = SSH_ERR_LIBCRYPTO_ERROR;
1608 goto out;
1609 }
1610 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1611 *ecdsap = private;
1612 private = NULL;
1613 ret = 0;
1614 out:
1615 EC_KEY_free(private);
1616 return ret;
1617 }
1618 # endif /* OPENSSL_HAS_ECC */
1619 #endif /* WITH_OPENSSL */
1620
1621 int
sshkey_generate(int type,u_int bits,struct sshkey ** keyp)1622 sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1623 {
1624 struct sshkey *k;
1625 int ret = SSH_ERR_INTERNAL_ERROR;
1626
1627 if (keyp == NULL)
1628 return SSH_ERR_INVALID_ARGUMENT;
1629 *keyp = NULL;
1630 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1631 return SSH_ERR_ALLOC_FAIL;
1632 switch (type) {
1633 case KEY_ED25519:
1634 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1635 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1636 ret = SSH_ERR_ALLOC_FAIL;
1637 break;
1638 }
1639 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1640 ret = 0;
1641 break;
1642 #ifdef WITH_XMSS
1643 case KEY_XMSS:
1644 ret = sshkey_xmss_generate_private_key(k, bits);
1645 break;
1646 #endif /* WITH_XMSS */
1647 #ifdef WITH_OPENSSL
1648 case KEY_DSA:
1649 ret = dsa_generate_private_key(bits, &k->dsa);
1650 break;
1651 # ifdef OPENSSL_HAS_ECC
1652 case KEY_ECDSA:
1653 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1654 &k->ecdsa);
1655 break;
1656 # endif /* OPENSSL_HAS_ECC */
1657 case KEY_RSA:
1658 ret = rsa_generate_private_key(bits, &k->rsa);
1659 break;
1660 #endif /* WITH_OPENSSL */
1661 default:
1662 ret = SSH_ERR_INVALID_ARGUMENT;
1663 }
1664 if (ret == 0) {
1665 k->type = type;
1666 *keyp = k;
1667 } else
1668 sshkey_free(k);
1669 return ret;
1670 }
1671
1672 int
sshkey_cert_copy(const struct sshkey * from_key,struct sshkey * to_key)1673 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1674 {
1675 u_int i;
1676 const struct sshkey_cert *from;
1677 struct sshkey_cert *to;
1678 int ret = SSH_ERR_INTERNAL_ERROR;
1679
1680 if (to_key->cert != NULL) {
1681 cert_free(to_key->cert);
1682 to_key->cert = NULL;
1683 }
1684
1685 if ((from = from_key->cert) == NULL)
1686 return SSH_ERR_INVALID_ARGUMENT;
1687
1688 if ((to = to_key->cert = cert_new()) == NULL)
1689 return SSH_ERR_ALLOC_FAIL;
1690
1691 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1692 (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1693 (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1694 return ret;
1695
1696 to->serial = from->serial;
1697 to->type = from->type;
1698 if (from->key_id == NULL)
1699 to->key_id = NULL;
1700 else if ((to->key_id = strdup(from->key_id)) == NULL)
1701 return SSH_ERR_ALLOC_FAIL;
1702 to->valid_after = from->valid_after;
1703 to->valid_before = from->valid_before;
1704 if (from->signature_key == NULL)
1705 to->signature_key = NULL;
1706 else if ((ret = sshkey_from_private(from->signature_key,
1707 &to->signature_key)) != 0)
1708 return ret;
1709
1710 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1711 return SSH_ERR_INVALID_ARGUMENT;
1712 if (from->nprincipals > 0) {
1713 if ((to->principals = calloc(from->nprincipals,
1714 sizeof(*to->principals))) == NULL)
1715 return SSH_ERR_ALLOC_FAIL;
1716 for (i = 0; i < from->nprincipals; i++) {
1717 to->principals[i] = strdup(from->principals[i]);
1718 if (to->principals[i] == NULL) {
1719 to->nprincipals = i;
1720 return SSH_ERR_ALLOC_FAIL;
1721 }
1722 }
1723 }
1724 to->nprincipals = from->nprincipals;
1725 return 0;
1726 }
1727
1728 int
sshkey_from_private(const struct sshkey * k,struct sshkey ** pkp)1729 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1730 {
1731 struct sshkey *n = NULL;
1732 int r = SSH_ERR_INTERNAL_ERROR;
1733 #ifdef WITH_OPENSSL
1734 const BIGNUM *rsa_n, *rsa_e;
1735 BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1736 const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1737 BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1738 BIGNUM *dsa_pub_key_dup = NULL;
1739 #endif /* WITH_OPENSSL */
1740
1741 *pkp = NULL;
1742 switch (k->type) {
1743 #ifdef WITH_OPENSSL
1744 case KEY_DSA:
1745 case KEY_DSA_CERT:
1746 if ((n = sshkey_new(k->type)) == NULL) {
1747 r = SSH_ERR_ALLOC_FAIL;
1748 goto out;
1749 }
1750
1751 DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1752 DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1753 if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1754 (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1755 (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1756 (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1757 r = SSH_ERR_ALLOC_FAIL;
1758 goto out;
1759 }
1760 if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1761 r = SSH_ERR_LIBCRYPTO_ERROR;
1762 goto out;
1763 }
1764 dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1765 if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1766 r = SSH_ERR_LIBCRYPTO_ERROR;
1767 goto out;
1768 }
1769 dsa_pub_key_dup = NULL; /* transferred */
1770
1771 break;
1772 # ifdef OPENSSL_HAS_ECC
1773 case KEY_ECDSA:
1774 case KEY_ECDSA_CERT:
1775 if ((n = sshkey_new(k->type)) == NULL) {
1776 r = SSH_ERR_ALLOC_FAIL;
1777 goto out;
1778 }
1779 n->ecdsa_nid = k->ecdsa_nid;
1780 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1781 if (n->ecdsa == NULL) {
1782 r = SSH_ERR_ALLOC_FAIL;
1783 goto out;
1784 }
1785 if (EC_KEY_set_public_key(n->ecdsa,
1786 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1787 r = SSH_ERR_LIBCRYPTO_ERROR;
1788 goto out;
1789 }
1790 break;
1791 # endif /* OPENSSL_HAS_ECC */
1792 case KEY_RSA:
1793 case KEY_RSA_CERT:
1794 if ((n = sshkey_new(k->type)) == NULL) {
1795 r = SSH_ERR_ALLOC_FAIL;
1796 goto out;
1797 }
1798 RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1799 if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1800 (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1801 r = SSH_ERR_ALLOC_FAIL;
1802 goto out;
1803 }
1804 if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1805 r = SSH_ERR_LIBCRYPTO_ERROR;
1806 goto out;
1807 }
1808 rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1809 break;
1810 #endif /* WITH_OPENSSL */
1811 case KEY_ED25519:
1812 case KEY_ED25519_CERT:
1813 if ((n = sshkey_new(k->type)) == NULL) {
1814 r = SSH_ERR_ALLOC_FAIL;
1815 goto out;
1816 }
1817 if (k->ed25519_pk != NULL) {
1818 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1819 r = SSH_ERR_ALLOC_FAIL;
1820 goto out;
1821 }
1822 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1823 }
1824 break;
1825 #ifdef WITH_XMSS
1826 case KEY_XMSS:
1827 case KEY_XMSS_CERT:
1828 if ((n = sshkey_new(k->type)) == NULL) {
1829 r = SSH_ERR_ALLOC_FAIL;
1830 goto out;
1831 }
1832 if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1833 goto out;
1834 if (k->xmss_pk != NULL) {
1835 size_t pklen = sshkey_xmss_pklen(k);
1836 if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1837 r = SSH_ERR_INTERNAL_ERROR;
1838 goto out;
1839 }
1840 if ((n->xmss_pk = malloc(pklen)) == NULL) {
1841 r = SSH_ERR_ALLOC_FAIL;
1842 goto out;
1843 }
1844 memcpy(n->xmss_pk, k->xmss_pk, pklen);
1845 }
1846 break;
1847 #endif /* WITH_XMSS */
1848 default:
1849 r = SSH_ERR_KEY_TYPE_UNKNOWN;
1850 goto out;
1851 }
1852 if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1853 goto out;
1854 /* success */
1855 *pkp = n;
1856 n = NULL;
1857 r = 0;
1858 out:
1859 sshkey_free(n);
1860 #ifdef WITH_OPENSSL
1861 BN_clear_free(rsa_n_dup);
1862 BN_clear_free(rsa_e_dup);
1863 BN_clear_free(dsa_p_dup);
1864 BN_clear_free(dsa_q_dup);
1865 BN_clear_free(dsa_g_dup);
1866 BN_clear_free(dsa_pub_key_dup);
1867 #endif
1868
1869 return r;
1870 }
1871
1872 static int
cert_parse(struct sshbuf * b,struct sshkey * key,struct sshbuf * certbuf)1873 cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1874 {
1875 struct sshbuf *principals = NULL, *crit = NULL;
1876 struct sshbuf *exts = NULL, *ca = NULL;
1877 u_char *sig = NULL;
1878 size_t signed_len = 0, slen = 0, kidlen = 0;
1879 int ret = SSH_ERR_INTERNAL_ERROR;
1880
1881 /* Copy the entire key blob for verification and later serialisation */
1882 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1883 return ret;
1884
1885 /* Parse body of certificate up to signature */
1886 if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1887 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1888 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1889 (ret = sshbuf_froms(b, &principals)) != 0 ||
1890 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1891 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1892 (ret = sshbuf_froms(b, &crit)) != 0 ||
1893 (ret = sshbuf_froms(b, &exts)) != 0 ||
1894 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1895 (ret = sshbuf_froms(b, &ca)) != 0) {
1896 /* XXX debug print error for ret */
1897 ret = SSH_ERR_INVALID_FORMAT;
1898 goto out;
1899 }
1900
1901 /* Signature is left in the buffer so we can calculate this length */
1902 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1903
1904 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1905 ret = SSH_ERR_INVALID_FORMAT;
1906 goto out;
1907 }
1908
1909 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1910 key->cert->type != SSH2_CERT_TYPE_HOST) {
1911 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1912 goto out;
1913 }
1914
1915 /* Parse principals section */
1916 while (sshbuf_len(principals) > 0) {
1917 char *principal = NULL;
1918 char **oprincipals = NULL;
1919
1920 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1921 ret = SSH_ERR_INVALID_FORMAT;
1922 goto out;
1923 }
1924 if ((ret = sshbuf_get_cstring(principals, &principal,
1925 NULL)) != 0) {
1926 ret = SSH_ERR_INVALID_FORMAT;
1927 goto out;
1928 }
1929 oprincipals = key->cert->principals;
1930 key->cert->principals = recallocarray(key->cert->principals,
1931 key->cert->nprincipals, key->cert->nprincipals + 1,
1932 sizeof(*key->cert->principals));
1933 if (key->cert->principals == NULL) {
1934 free(principal);
1935 key->cert->principals = oprincipals;
1936 ret = SSH_ERR_ALLOC_FAIL;
1937 goto out;
1938 }
1939 key->cert->principals[key->cert->nprincipals++] = principal;
1940 }
1941
1942 /*
1943 * Stash a copies of the critical options and extensions sections
1944 * for later use.
1945 */
1946 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1947 (exts != NULL &&
1948 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1949 goto out;
1950
1951 /*
1952 * Validate critical options and extensions sections format.
1953 */
1954 while (sshbuf_len(crit) != 0) {
1955 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1956 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1957 sshbuf_reset(key->cert->critical);
1958 ret = SSH_ERR_INVALID_FORMAT;
1959 goto out;
1960 }
1961 }
1962 while (exts != NULL && sshbuf_len(exts) != 0) {
1963 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1964 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1965 sshbuf_reset(key->cert->extensions);
1966 ret = SSH_ERR_INVALID_FORMAT;
1967 goto out;
1968 }
1969 }
1970
1971 /* Parse CA key and check signature */
1972 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1973 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1974 goto out;
1975 }
1976 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1977 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1978 goto out;
1979 }
1980 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1981 sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1982 goto out;
1983
1984 /* Success */
1985 ret = 0;
1986 out:
1987 sshbuf_free(ca);
1988 sshbuf_free(crit);
1989 sshbuf_free(exts);
1990 sshbuf_free(principals);
1991 free(sig);
1992 return ret;
1993 }
1994
1995 #ifdef WITH_OPENSSL
1996 static int
check_rsa_length(const RSA * rsa)1997 check_rsa_length(const RSA *rsa)
1998 {
1999 const BIGNUM *rsa_n;
2000
2001 RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2002 if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2003 return SSH_ERR_KEY_LENGTH;
2004 return 0;
2005 }
2006 #endif
2007
2008 static int
sshkey_from_blob_internal(struct sshbuf * b,struct sshkey ** keyp,int allow_cert)2009 sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2010 int allow_cert)
2011 {
2012 int type, ret = SSH_ERR_INTERNAL_ERROR;
2013 char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
2014 struct sshkey *key = NULL;
2015 size_t len;
2016 u_char *pk = NULL;
2017 struct sshbuf *copy;
2018 #if defined(WITH_OPENSSL)
2019 BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2020 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
2021 # if defined(OPENSSL_HAS_ECC)
2022 EC_POINT *q = NULL;
2023 # endif /* OPENSSL_HAS_ECC */
2024 #endif /* WITH_OPENSSL */
2025
2026 #ifdef DEBUG_PK /* XXX */
2027 sshbuf_dump(b, stderr);
2028 #endif
2029 if (keyp != NULL)
2030 *keyp = NULL;
2031 if ((copy = sshbuf_fromb(b)) == NULL) {
2032 ret = SSH_ERR_ALLOC_FAIL;
2033 goto out;
2034 }
2035 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2036 ret = SSH_ERR_INVALID_FORMAT;
2037 goto out;
2038 }
2039
2040 type = sshkey_type_from_name(ktype);
2041 if (!allow_cert && sshkey_type_is_cert(type)) {
2042 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2043 goto out;
2044 }
2045 switch (type) {
2046 #ifdef WITH_OPENSSL
2047 case KEY_RSA_CERT:
2048 /* Skip nonce */
2049 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2050 ret = SSH_ERR_INVALID_FORMAT;
2051 goto out;
2052 }
2053 /* FALLTHROUGH */
2054 case KEY_RSA:
2055 if ((key = sshkey_new(type)) == NULL) {
2056 ret = SSH_ERR_ALLOC_FAIL;
2057 goto out;
2058 }
2059 if ((rsa_e = BN_new()) == NULL ||
2060 (rsa_n = BN_new()) == NULL) {
2061 ret = SSH_ERR_ALLOC_FAIL;
2062 goto out;
2063 }
2064 if (sshbuf_get_bignum2(b, rsa_e) != 0 ||
2065 sshbuf_get_bignum2(b, rsa_n) != 0) {
2066 ret = SSH_ERR_INVALID_FORMAT;
2067 goto out;
2068 }
2069 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2070 ret = SSH_ERR_LIBCRYPTO_ERROR;
2071 goto out;
2072 }
2073 rsa_n = rsa_e = NULL; /* transferred */
2074 if ((ret = check_rsa_length(key->rsa)) != 0)
2075 goto out;
2076 #ifdef DEBUG_PK
2077 RSA_print_fp(stderr, key->rsa, 8);
2078 #endif
2079 break;
2080 case KEY_DSA_CERT:
2081 /* Skip nonce */
2082 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2083 ret = SSH_ERR_INVALID_FORMAT;
2084 goto out;
2085 }
2086 /* FALLTHROUGH */
2087 case KEY_DSA:
2088 if ((key = sshkey_new(type)) == NULL) {
2089 ret = SSH_ERR_ALLOC_FAIL;
2090 goto out;
2091 }
2092 if ((dsa_p = BN_new()) == NULL ||
2093 (dsa_q = BN_new()) == NULL ||
2094 (dsa_g = BN_new()) == NULL ||
2095 (dsa_pub_key = BN_new()) == NULL) {
2096 ret = SSH_ERR_ALLOC_FAIL;
2097 goto out;
2098 }
2099 if (sshbuf_get_bignum2(b, dsa_p) != 0 ||
2100 sshbuf_get_bignum2(b, dsa_q) != 0 ||
2101 sshbuf_get_bignum2(b, dsa_g) != 0 ||
2102 sshbuf_get_bignum2(b, dsa_pub_key) != 0) {
2103 ret = SSH_ERR_INVALID_FORMAT;
2104 goto out;
2105 }
2106 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2107 ret = SSH_ERR_LIBCRYPTO_ERROR;
2108 goto out;
2109 }
2110 dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2111 if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2112 ret = SSH_ERR_LIBCRYPTO_ERROR;
2113 goto out;
2114 }
2115 dsa_pub_key = NULL; /* transferred */
2116 #ifdef DEBUG_PK
2117 DSA_print_fp(stderr, key->dsa, 8);
2118 #endif
2119 break;
2120 case KEY_ECDSA_CERT:
2121 /* Skip nonce */
2122 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2123 ret = SSH_ERR_INVALID_FORMAT;
2124 goto out;
2125 }
2126 /* FALLTHROUGH */
2127 # ifdef OPENSSL_HAS_ECC
2128 case KEY_ECDSA:
2129 if ((key = sshkey_new(type)) == NULL) {
2130 ret = SSH_ERR_ALLOC_FAIL;
2131 goto out;
2132 }
2133 key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
2134 if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2135 ret = SSH_ERR_INVALID_FORMAT;
2136 goto out;
2137 }
2138 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2139 ret = SSH_ERR_EC_CURVE_MISMATCH;
2140 goto out;
2141 }
2142 EC_KEY_free(key->ecdsa);
2143 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2144 == NULL) {
2145 ret = SSH_ERR_EC_CURVE_INVALID;
2146 goto out;
2147 }
2148 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2149 ret = SSH_ERR_ALLOC_FAIL;
2150 goto out;
2151 }
2152 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2153 ret = SSH_ERR_INVALID_FORMAT;
2154 goto out;
2155 }
2156 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2157 q) != 0) {
2158 ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2159 goto out;
2160 }
2161 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2162 /* XXX assume it is a allocation error */
2163 ret = SSH_ERR_ALLOC_FAIL;
2164 goto out;
2165 }
2166 #ifdef DEBUG_PK
2167 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2168 #endif
2169 break;
2170 # endif /* OPENSSL_HAS_ECC */
2171 #endif /* WITH_OPENSSL */
2172 case KEY_ED25519_CERT:
2173 /* Skip nonce */
2174 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2175 ret = SSH_ERR_INVALID_FORMAT;
2176 goto out;
2177 }
2178 /* FALLTHROUGH */
2179 case KEY_ED25519:
2180 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2181 goto out;
2182 if (len != ED25519_PK_SZ) {
2183 ret = SSH_ERR_INVALID_FORMAT;
2184 goto out;
2185 }
2186 if ((key = sshkey_new(type)) == NULL) {
2187 ret = SSH_ERR_ALLOC_FAIL;
2188 goto out;
2189 }
2190 key->ed25519_pk = pk;
2191 pk = NULL;
2192 break;
2193 #ifdef WITH_XMSS
2194 case KEY_XMSS_CERT:
2195 /* Skip nonce */
2196 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2197 ret = SSH_ERR_INVALID_FORMAT;
2198 goto out;
2199 }
2200 /* FALLTHROUGH */
2201 case KEY_XMSS:
2202 if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2203 goto out;
2204 if ((key = sshkey_new(type)) == NULL) {
2205 ret = SSH_ERR_ALLOC_FAIL;
2206 goto out;
2207 }
2208 if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2209 goto out;
2210 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2211 goto out;
2212 if (len == 0 || len != sshkey_xmss_pklen(key)) {
2213 ret = SSH_ERR_INVALID_FORMAT;
2214 goto out;
2215 }
2216 key->xmss_pk = pk;
2217 pk = NULL;
2218 if (type != KEY_XMSS_CERT &&
2219 (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2220 goto out;
2221 break;
2222 #endif /* WITH_XMSS */
2223 case KEY_UNSPEC:
2224 default:
2225 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2226 goto out;
2227 }
2228
2229 /* Parse certificate potion */
2230 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
2231 goto out;
2232
2233 if (key != NULL && sshbuf_len(b) != 0) {
2234 ret = SSH_ERR_INVALID_FORMAT;
2235 goto out;
2236 }
2237 ret = 0;
2238 if (keyp != NULL) {
2239 *keyp = key;
2240 key = NULL;
2241 }
2242 out:
2243 sshbuf_free(copy);
2244 sshkey_free(key);
2245 free(xmss_name);
2246 free(ktype);
2247 free(curve);
2248 free(pk);
2249 #if defined(WITH_OPENSSL)
2250 BN_clear_free(rsa_n);
2251 BN_clear_free(rsa_e);
2252 BN_clear_free(dsa_p);
2253 BN_clear_free(dsa_q);
2254 BN_clear_free(dsa_g);
2255 BN_clear_free(dsa_pub_key);
2256 # if defined(OPENSSL_HAS_ECC)
2257 EC_POINT_free(q);
2258 # endif /* OPENSSL_HAS_ECC */
2259 #endif /* WITH_OPENSSL */
2260 return ret;
2261 }
2262
2263 int
sshkey_from_blob(const u_char * blob,size_t blen,struct sshkey ** keyp)2264 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2265 {
2266 struct sshbuf *b;
2267 int r;
2268
2269 if ((b = sshbuf_from(blob, blen)) == NULL)
2270 return SSH_ERR_ALLOC_FAIL;
2271 r = sshkey_from_blob_internal(b, keyp, 1);
2272 sshbuf_free(b);
2273 return r;
2274 }
2275
2276 int
sshkey_fromb(struct sshbuf * b,struct sshkey ** keyp)2277 sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2278 {
2279 return sshkey_from_blob_internal(b, keyp, 1);
2280 }
2281
2282 int
sshkey_froms(struct sshbuf * buf,struct sshkey ** keyp)2283 sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2284 {
2285 struct sshbuf *b;
2286 int r;
2287
2288 if ((r = sshbuf_froms(buf, &b)) != 0)
2289 return r;
2290 r = sshkey_from_blob_internal(b, keyp, 1);
2291 sshbuf_free(b);
2292 return r;
2293 }
2294
2295 static int
get_sigtype(const u_char * sig,size_t siglen,char ** sigtypep)2296 get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
2297 {
2298 int r;
2299 struct sshbuf *b = NULL;
2300 char *sigtype = NULL;
2301
2302 if (sigtypep != NULL)
2303 *sigtypep = NULL;
2304 if ((b = sshbuf_from(sig, siglen)) == NULL)
2305 return SSH_ERR_ALLOC_FAIL;
2306 if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2307 goto out;
2308 /* success */
2309 if (sigtypep != NULL) {
2310 *sigtypep = sigtype;
2311 sigtype = NULL;
2312 }
2313 r = 0;
2314 out:
2315 free(sigtype);
2316 sshbuf_free(b);
2317 return r;
2318 }
2319
2320 /*
2321 * Returns the expected signature algorithm for a given public key algorithm.
2322 */
2323 const char *
sshkey_sigalg_by_name(const char * name)2324 sshkey_sigalg_by_name(const char *name)
2325 {
2326 const struct keytype *kt;
2327
2328 for (kt = keytypes; kt->type != -1; kt++) {
2329 if (strcmp(kt->name, name) != 0)
2330 continue;
2331 if (kt->sigalg != NULL)
2332 return kt->sigalg;
2333 if (!kt->cert)
2334 return kt->name;
2335 return sshkey_ssh_name_from_type_nid(
2336 sshkey_type_plain(kt->type), kt->nid);
2337 }
2338 return NULL;
2339 }
2340
2341 /*
2342 * Verifies that the signature algorithm appearing inside the signature blob
2343 * matches that which was requested.
2344 */
2345 int
sshkey_check_sigtype(const u_char * sig,size_t siglen,const char * requested_alg)2346 sshkey_check_sigtype(const u_char *sig, size_t siglen,
2347 const char *requested_alg)
2348 {
2349 const char *expected_alg;
2350 char *sigtype = NULL;
2351 int r;
2352
2353 if (requested_alg == NULL)
2354 return 0;
2355 if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
2356 return SSH_ERR_INVALID_ARGUMENT;
2357 if ((r = get_sigtype(sig, siglen, &sigtype)) != 0)
2358 return r;
2359 r = strcmp(expected_alg, sigtype) == 0;
2360 free(sigtype);
2361 return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
2362 }
2363
2364 int
sshkey_sign(const struct sshkey * key,u_char ** sigp,size_t * lenp,const u_char * data,size_t datalen,const char * alg,u_int compat)2365 sshkey_sign(const struct sshkey *key,
2366 u_char **sigp, size_t *lenp,
2367 const u_char *data, size_t datalen, const char *alg, u_int compat)
2368 {
2369 if (sigp != NULL)
2370 *sigp = NULL;
2371 if (lenp != NULL)
2372 *lenp = 0;
2373 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2374 return SSH_ERR_INVALID_ARGUMENT;
2375 switch (key->type) {
2376 #ifdef WITH_OPENSSL
2377 case KEY_DSA_CERT:
2378 case KEY_DSA:
2379 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2380 # ifdef OPENSSL_HAS_ECC
2381 case KEY_ECDSA_CERT:
2382 case KEY_ECDSA:
2383 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2384 # endif /* OPENSSL_HAS_ECC */
2385 case KEY_RSA_CERT:
2386 case KEY_RSA:
2387 return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2388 #endif /* WITH_OPENSSL */
2389 case KEY_ED25519:
2390 case KEY_ED25519_CERT:
2391 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2392 #ifdef WITH_XMSS
2393 case KEY_XMSS:
2394 case KEY_XMSS_CERT:
2395 return ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2396 #endif /* WITH_XMSS */
2397 default:
2398 return SSH_ERR_KEY_TYPE_UNKNOWN;
2399 }
2400 }
2401
2402 /*
2403 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2404 * If "alg" specified, then the signature must use that algorithm.
2405 */
2406 int
sshkey_verify(const struct sshkey * key,const u_char * sig,size_t siglen,const u_char * data,size_t dlen,const char * alg,u_int compat)2407 sshkey_verify(const struct sshkey *key,
2408 const u_char *sig, size_t siglen,
2409 const u_char *data, size_t dlen, const char *alg, u_int compat)
2410 {
2411 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2412 return SSH_ERR_INVALID_ARGUMENT;
2413 switch (key->type) {
2414 #ifdef WITH_OPENSSL
2415 case KEY_DSA_CERT:
2416 case KEY_DSA:
2417 return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2418 # ifdef OPENSSL_HAS_ECC
2419 case KEY_ECDSA_CERT:
2420 case KEY_ECDSA:
2421 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2422 # endif /* OPENSSL_HAS_ECC */
2423 case KEY_RSA_CERT:
2424 case KEY_RSA:
2425 return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
2426 #endif /* WITH_OPENSSL */
2427 case KEY_ED25519:
2428 case KEY_ED25519_CERT:
2429 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2430 #ifdef WITH_XMSS
2431 case KEY_XMSS:
2432 case KEY_XMSS_CERT:
2433 return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2434 #endif /* WITH_XMSS */
2435 default:
2436 return SSH_ERR_KEY_TYPE_UNKNOWN;
2437 }
2438 }
2439
2440 /* Convert a plain key to their _CERT equivalent */
2441 int
sshkey_to_certified(struct sshkey * k)2442 sshkey_to_certified(struct sshkey *k)
2443 {
2444 int newtype;
2445
2446 switch (k->type) {
2447 #ifdef WITH_OPENSSL
2448 case KEY_RSA:
2449 newtype = KEY_RSA_CERT;
2450 break;
2451 case KEY_DSA:
2452 newtype = KEY_DSA_CERT;
2453 break;
2454 case KEY_ECDSA:
2455 newtype = KEY_ECDSA_CERT;
2456 break;
2457 #endif /* WITH_OPENSSL */
2458 case KEY_ED25519:
2459 newtype = KEY_ED25519_CERT;
2460 break;
2461 #ifdef WITH_XMSS
2462 case KEY_XMSS:
2463 newtype = KEY_XMSS_CERT;
2464 break;
2465 #endif /* WITH_XMSS */
2466 default:
2467 return SSH_ERR_INVALID_ARGUMENT;
2468 }
2469 if ((k->cert = cert_new()) == NULL)
2470 return SSH_ERR_ALLOC_FAIL;
2471 k->type = newtype;
2472 return 0;
2473 }
2474
2475 /* Convert a certificate to its raw key equivalent */
2476 int
sshkey_drop_cert(struct sshkey * k)2477 sshkey_drop_cert(struct sshkey *k)
2478 {
2479 if (!sshkey_type_is_cert(k->type))
2480 return SSH_ERR_KEY_TYPE_UNKNOWN;
2481 cert_free(k->cert);
2482 k->cert = NULL;
2483 k->type = sshkey_type_plain(k->type);
2484 return 0;
2485 }
2486
2487 /* Sign a certified key, (re-)generating the signed certblob. */
2488 int
sshkey_certify_custom(struct sshkey * k,struct sshkey * ca,const char * alg,sshkey_certify_signer * signer,void * signer_ctx)2489 sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2490 sshkey_certify_signer *signer, void *signer_ctx)
2491 {
2492 struct sshbuf *principals = NULL;
2493 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2494 size_t i, ca_len, sig_len;
2495 int ret = SSH_ERR_INTERNAL_ERROR;
2496 struct sshbuf *cert;
2497 #ifdef WITH_OPENSSL
2498 const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2499 #endif /* WITH_OPENSSL */
2500
2501 if (k == NULL || k->cert == NULL ||
2502 k->cert->certblob == NULL || ca == NULL)
2503 return SSH_ERR_INVALID_ARGUMENT;
2504 if (!sshkey_is_cert(k))
2505 return SSH_ERR_KEY_TYPE_UNKNOWN;
2506 if (!sshkey_type_is_valid_ca(ca->type))
2507 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2508
2509 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2510 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2511
2512 cert = k->cert->certblob; /* for readability */
2513 sshbuf_reset(cert);
2514 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2515 goto out;
2516
2517 /* -v01 certs put nonce first */
2518 arc4random_buf(&nonce, sizeof(nonce));
2519 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2520 goto out;
2521
2522 /* XXX this substantially duplicates to_blob(); refactor */
2523 switch (k->type) {
2524 #ifdef WITH_OPENSSL
2525 case KEY_DSA_CERT:
2526 DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2527 DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2528 if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2529 (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2530 (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2531 (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
2532 goto out;
2533 break;
2534 # ifdef OPENSSL_HAS_ECC
2535 case KEY_ECDSA_CERT:
2536 if ((ret = sshbuf_put_cstring(cert,
2537 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2538 (ret = sshbuf_put_ec(cert,
2539 EC_KEY_get0_public_key(k->ecdsa),
2540 EC_KEY_get0_group(k->ecdsa))) != 0)
2541 goto out;
2542 break;
2543 # endif /* OPENSSL_HAS_ECC */
2544 case KEY_RSA_CERT:
2545 RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2546 if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2547 (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
2548 goto out;
2549 break;
2550 #endif /* WITH_OPENSSL */
2551 case KEY_ED25519_CERT:
2552 if ((ret = sshbuf_put_string(cert,
2553 k->ed25519_pk, ED25519_PK_SZ)) != 0)
2554 goto out;
2555 break;
2556 #ifdef WITH_XMSS
2557 case KEY_XMSS_CERT:
2558 if (k->xmss_name == NULL) {
2559 ret = SSH_ERR_INVALID_ARGUMENT;
2560 goto out;
2561 }
2562 if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2563 (ret = sshbuf_put_string(cert,
2564 k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2565 goto out;
2566 break;
2567 #endif /* WITH_XMSS */
2568 default:
2569 ret = SSH_ERR_INVALID_ARGUMENT;
2570 goto out;
2571 }
2572
2573 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2574 (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2575 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2576 goto out;
2577
2578 if ((principals = sshbuf_new()) == NULL) {
2579 ret = SSH_ERR_ALLOC_FAIL;
2580 goto out;
2581 }
2582 for (i = 0; i < k->cert->nprincipals; i++) {
2583 if ((ret = sshbuf_put_cstring(principals,
2584 k->cert->principals[i])) != 0)
2585 goto out;
2586 }
2587 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2588 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2589 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2590 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2591 (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2592 (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2593 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2594 goto out;
2595
2596 /* Sign the whole mess */
2597 if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2598 sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
2599 goto out;
2600
2601 /* Append signature and we are done */
2602 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2603 goto out;
2604 ret = 0;
2605 out:
2606 if (ret != 0)
2607 sshbuf_reset(cert);
2608 free(sig_blob);
2609 free(ca_blob);
2610 sshbuf_free(principals);
2611 return ret;
2612 }
2613
2614 static int
default_key_sign(const struct sshkey * key,u_char ** sigp,size_t * lenp,const u_char * data,size_t datalen,const char * alg,u_int compat,void * ctx)2615 default_key_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
2616 const u_char *data, size_t datalen,
2617 const char *alg, u_int compat, void *ctx)
2618 {
2619 if (ctx != NULL)
2620 return SSH_ERR_INVALID_ARGUMENT;
2621 return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2622 }
2623
2624 int
sshkey_certify(struct sshkey * k,struct sshkey * ca,const char * alg)2625 sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2626 {
2627 return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
2628 }
2629
2630 int
sshkey_cert_check_authority(const struct sshkey * k,int want_host,int require_principal,const char * name,const char ** reason)2631 sshkey_cert_check_authority(const struct sshkey *k,
2632 int want_host, int require_principal,
2633 const char *name, const char **reason)
2634 {
2635 u_int i, principal_matches;
2636 time_t now = time(NULL);
2637
2638 if (reason != NULL)
2639 *reason = NULL;
2640
2641 if (want_host) {
2642 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2643 *reason = "Certificate invalid: not a host certificate";
2644 return SSH_ERR_KEY_CERT_INVALID;
2645 }
2646 } else {
2647 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2648 *reason = "Certificate invalid: not a user certificate";
2649 return SSH_ERR_KEY_CERT_INVALID;
2650 }
2651 }
2652 if (now < 0) {
2653 /* yikes - system clock before epoch! */
2654 *reason = "Certificate invalid: not yet valid";
2655 return SSH_ERR_KEY_CERT_INVALID;
2656 }
2657 if ((u_int64_t)now < k->cert->valid_after) {
2658 *reason = "Certificate invalid: not yet valid";
2659 return SSH_ERR_KEY_CERT_INVALID;
2660 }
2661 if ((u_int64_t)now >= k->cert->valid_before) {
2662 *reason = "Certificate invalid: expired";
2663 return SSH_ERR_KEY_CERT_INVALID;
2664 }
2665 if (k->cert->nprincipals == 0) {
2666 if (require_principal) {
2667 *reason = "Certificate lacks principal list";
2668 return SSH_ERR_KEY_CERT_INVALID;
2669 }
2670 } else if (name != NULL) {
2671 principal_matches = 0;
2672 for (i = 0; i < k->cert->nprincipals; i++) {
2673 if (strcmp(name, k->cert->principals[i]) == 0) {
2674 principal_matches = 1;
2675 break;
2676 }
2677 }
2678 if (!principal_matches) {
2679 *reason = "Certificate invalid: name is not a listed "
2680 "principal";
2681 return SSH_ERR_KEY_CERT_INVALID;
2682 }
2683 }
2684 return 0;
2685 }
2686
2687 size_t
sshkey_format_cert_validity(const struct sshkey_cert * cert,char * s,size_t l)2688 sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2689 {
2690 char from[32], to[32], ret[64];
2691 time_t tt;
2692 struct tm *tm;
2693
2694 *from = *to = '\0';
2695 if (cert->valid_after == 0 &&
2696 cert->valid_before == 0xffffffffffffffffULL)
2697 return strlcpy(s, "forever", l);
2698
2699 if (cert->valid_after != 0) {
2700 /* XXX revisit INT_MAX in 2038 :) */
2701 tt = cert->valid_after > INT_MAX ?
2702 INT_MAX : cert->valid_after;
2703 tm = localtime(&tt);
2704 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2705 }
2706 if (cert->valid_before != 0xffffffffffffffffULL) {
2707 /* XXX revisit INT_MAX in 2038 :) */
2708 tt = cert->valid_before > INT_MAX ?
2709 INT_MAX : cert->valid_before;
2710 tm = localtime(&tt);
2711 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2712 }
2713
2714 if (cert->valid_after == 0)
2715 snprintf(ret, sizeof(ret), "before %s", to);
2716 else if (cert->valid_before == 0xffffffffffffffffULL)
2717 snprintf(ret, sizeof(ret), "after %s", from);
2718 else
2719 snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2720
2721 return strlcpy(s, ret, l);
2722 }
2723
2724 int
sshkey_private_serialize_opt(const struct sshkey * key,struct sshbuf * b,enum sshkey_serialize_rep opts)2725 sshkey_private_serialize_opt(const struct sshkey *key, struct sshbuf *b,
2726 enum sshkey_serialize_rep opts)
2727 {
2728 int r = SSH_ERR_INTERNAL_ERROR;
2729 #ifdef WITH_OPENSSL
2730 const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2731 const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2732 #endif /* WITH_OPENSSL */
2733
2734 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2735 goto out;
2736 switch (key->type) {
2737 #ifdef WITH_OPENSSL
2738 case KEY_RSA:
2739 RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2740 RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2741 RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2742 if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2743 (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2744 (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2745 (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2746 (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2747 (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
2748 goto out;
2749 break;
2750 case KEY_RSA_CERT:
2751 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2752 r = SSH_ERR_INVALID_ARGUMENT;
2753 goto out;
2754 }
2755 RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2756 RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2757 RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2758 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2759 (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2760 (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2761 (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2762 (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
2763 goto out;
2764 break;
2765 case KEY_DSA:
2766 DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2767 DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2768 if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2769 (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2770 (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2771 (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2772 (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
2773 goto out;
2774 break;
2775 case KEY_DSA_CERT:
2776 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2777 r = SSH_ERR_INVALID_ARGUMENT;
2778 goto out;
2779 }
2780 DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
2781 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2782 (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
2783 goto out;
2784 break;
2785 # ifdef OPENSSL_HAS_ECC
2786 case KEY_ECDSA:
2787 if ((r = sshbuf_put_cstring(b,
2788 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2789 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2790 (r = sshbuf_put_bignum2(b,
2791 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2792 goto out;
2793 break;
2794 case KEY_ECDSA_CERT:
2795 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2796 r = SSH_ERR_INVALID_ARGUMENT;
2797 goto out;
2798 }
2799 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2800 (r = sshbuf_put_bignum2(b,
2801 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2802 goto out;
2803 break;
2804 # endif /* OPENSSL_HAS_ECC */
2805 #endif /* WITH_OPENSSL */
2806 case KEY_ED25519:
2807 if ((r = sshbuf_put_string(b, key->ed25519_pk,
2808 ED25519_PK_SZ)) != 0 ||
2809 (r = sshbuf_put_string(b, key->ed25519_sk,
2810 ED25519_SK_SZ)) != 0)
2811 goto out;
2812 break;
2813 case KEY_ED25519_CERT:
2814 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2815 r = SSH_ERR_INVALID_ARGUMENT;
2816 goto out;
2817 }
2818 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2819 (r = sshbuf_put_string(b, key->ed25519_pk,
2820 ED25519_PK_SZ)) != 0 ||
2821 (r = sshbuf_put_string(b, key->ed25519_sk,
2822 ED25519_SK_SZ)) != 0)
2823 goto out;
2824 break;
2825 #ifdef WITH_XMSS
2826 case KEY_XMSS:
2827 if (key->xmss_name == NULL) {
2828 r = SSH_ERR_INVALID_ARGUMENT;
2829 goto out;
2830 }
2831 if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2832 (r = sshbuf_put_string(b, key->xmss_pk,
2833 sshkey_xmss_pklen(key))) != 0 ||
2834 (r = sshbuf_put_string(b, key->xmss_sk,
2835 sshkey_xmss_sklen(key))) != 0 ||
2836 (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2837 goto out;
2838 break;
2839 case KEY_XMSS_CERT:
2840 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2841 key->xmss_name == NULL) {
2842 r = SSH_ERR_INVALID_ARGUMENT;
2843 goto out;
2844 }
2845 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2846 (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2847 (r = sshbuf_put_string(b, key->xmss_pk,
2848 sshkey_xmss_pklen(key))) != 0 ||
2849 (r = sshbuf_put_string(b, key->xmss_sk,
2850 sshkey_xmss_sklen(key))) != 0 ||
2851 (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2852 goto out;
2853 break;
2854 #endif /* WITH_XMSS */
2855 default:
2856 r = SSH_ERR_INVALID_ARGUMENT;
2857 goto out;
2858 }
2859 /* success */
2860 r = 0;
2861 out:
2862 return r;
2863 }
2864
2865 int
sshkey_private_serialize(const struct sshkey * key,struct sshbuf * b)2866 sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2867 {
2868 return sshkey_private_serialize_opt(key, b,
2869 SSHKEY_SERIALIZE_DEFAULT);
2870 }
2871
2872 int
sshkey_private_deserialize(struct sshbuf * buf,struct sshkey ** kp)2873 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2874 {
2875 char *tname = NULL, *curve = NULL, *xmss_name = NULL;
2876 struct sshkey *k = NULL;
2877 size_t pklen = 0, sklen = 0;
2878 int type, r = SSH_ERR_INTERNAL_ERROR;
2879 u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2880 u_char *xmss_pk = NULL, *xmss_sk = NULL;
2881 #ifdef WITH_OPENSSL
2882 BIGNUM *exponent = NULL;
2883 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2884 BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2885 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2886 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
2887 #endif /* WITH_OPENSSL */
2888
2889 if (kp != NULL)
2890 *kp = NULL;
2891 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2892 goto out;
2893 type = sshkey_type_from_name(tname);
2894 switch (type) {
2895 #ifdef WITH_OPENSSL
2896 case KEY_DSA:
2897 if ((k = sshkey_new_private(type)) == NULL) {
2898 r = SSH_ERR_ALLOC_FAIL;
2899 goto out;
2900 }
2901 if ((dsa_p = BN_new()) == NULL ||
2902 (dsa_q = BN_new()) == NULL ||
2903 (dsa_g = BN_new()) == NULL ||
2904 (dsa_pub_key = BN_new()) == NULL ||
2905 (dsa_priv_key = BN_new()) == NULL) {
2906 r = SSH_ERR_ALLOC_FAIL;
2907 goto out;
2908 }
2909 if ((r = sshbuf_get_bignum2(buf, dsa_p)) != 0 ||
2910 (r = sshbuf_get_bignum2(buf, dsa_q)) != 0 ||
2911 (r = sshbuf_get_bignum2(buf, dsa_g)) != 0 ||
2912 (r = sshbuf_get_bignum2(buf, dsa_pub_key)) != 0 ||
2913 (r = sshbuf_get_bignum2(buf, dsa_priv_key)) != 0)
2914 goto out;
2915 if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2916 r = SSH_ERR_LIBCRYPTO_ERROR;
2917 goto out;
2918 }
2919 dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2920 if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
2921 r = SSH_ERR_LIBCRYPTO_ERROR;
2922 goto out;
2923 }
2924 dsa_pub_key = dsa_priv_key = NULL; /* transferred */
2925 break;
2926 case KEY_DSA_CERT:
2927 if ((dsa_priv_key = BN_new()) == NULL) {
2928 r = SSH_ERR_ALLOC_FAIL;
2929 goto out;
2930 }
2931 if ((r = sshkey_froms(buf, &k)) != 0 ||
2932 (r = sshbuf_get_bignum2(buf, dsa_priv_key)) != 0)
2933 goto out;
2934 if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2935 r = SSH_ERR_LIBCRYPTO_ERROR;
2936 goto out;
2937 }
2938 dsa_priv_key = NULL; /* transferred */
2939 break;
2940 # ifdef OPENSSL_HAS_ECC
2941 case KEY_ECDSA:
2942 if ((k = sshkey_new_private(type)) == NULL) {
2943 r = SSH_ERR_ALLOC_FAIL;
2944 goto out;
2945 }
2946 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2947 r = SSH_ERR_INVALID_ARGUMENT;
2948 goto out;
2949 }
2950 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2951 goto out;
2952 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2953 r = SSH_ERR_EC_CURVE_MISMATCH;
2954 goto out;
2955 }
2956 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2957 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2958 r = SSH_ERR_LIBCRYPTO_ERROR;
2959 goto out;
2960 }
2961 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2962 (r = sshbuf_get_bignum2(buf, exponent)))
2963 goto out;
2964 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2965 r = SSH_ERR_LIBCRYPTO_ERROR;
2966 goto out;
2967 }
2968 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2969 EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
2970 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2971 goto out;
2972 break;
2973 case KEY_ECDSA_CERT:
2974 if ((exponent = BN_new()) == NULL) {
2975 r = SSH_ERR_LIBCRYPTO_ERROR;
2976 goto out;
2977 }
2978 if ((r = sshkey_froms(buf, &k)) != 0 ||
2979 (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2980 goto out;
2981 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2982 r = SSH_ERR_LIBCRYPTO_ERROR;
2983 goto out;
2984 }
2985 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2986 EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
2987 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2988 goto out;
2989 break;
2990 # endif /* OPENSSL_HAS_ECC */
2991 case KEY_RSA:
2992 if ((k = sshkey_new_private(type)) == NULL) {
2993 r = SSH_ERR_ALLOC_FAIL;
2994 goto out;
2995 }
2996 if ((rsa_n = BN_new()) == NULL ||
2997 (rsa_e = BN_new()) == NULL ||
2998 (rsa_d = BN_new()) == NULL ||
2999 (rsa_iqmp = BN_new()) == NULL ||
3000 (rsa_p = BN_new()) == NULL ||
3001 (rsa_q = BN_new()) == NULL) {
3002 r = SSH_ERR_ALLOC_FAIL;
3003 goto out;
3004 }
3005 if ((r = sshbuf_get_bignum2(buf, rsa_n)) != 0 ||
3006 (r = sshbuf_get_bignum2(buf, rsa_e)) != 0 ||
3007 (r = sshbuf_get_bignum2(buf, rsa_d)) != 0 ||
3008 (r = sshbuf_get_bignum2(buf, rsa_iqmp)) != 0 ||
3009 (r = sshbuf_get_bignum2(buf, rsa_p)) != 0 ||
3010 (r = sshbuf_get_bignum2(buf, rsa_q)) != 0)
3011 goto out;
3012 if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3013 r = SSH_ERR_LIBCRYPTO_ERROR;
3014 goto out;
3015 }
3016 rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3017 if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3018 r = SSH_ERR_LIBCRYPTO_ERROR;
3019 goto out;
3020 }
3021 rsa_p = rsa_q = NULL; /* transferred */
3022 if ((r = check_rsa_length(k->rsa)) != 0)
3023 goto out;
3024 if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3025 goto out;
3026 break;
3027 case KEY_RSA_CERT:
3028 if ((rsa_d = BN_new()) == NULL ||
3029 (rsa_iqmp = BN_new()) == NULL ||
3030 (rsa_p = BN_new()) == NULL ||
3031 (rsa_q = BN_new()) == NULL) {
3032 r = SSH_ERR_ALLOC_FAIL;
3033 goto out;
3034 }
3035 if ((r = sshkey_froms(buf, &k)) != 0 ||
3036 (r = sshbuf_get_bignum2(buf, rsa_d)) != 0 ||
3037 (r = sshbuf_get_bignum2(buf, rsa_iqmp)) != 0 ||
3038 (r = sshbuf_get_bignum2(buf, rsa_p)) != 0 ||
3039 (r = sshbuf_get_bignum2(buf, rsa_q)) != 0)
3040 goto out;
3041 if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3042 r = SSH_ERR_LIBCRYPTO_ERROR;
3043 goto out;
3044 }
3045 rsa_d = NULL; /* transferred */
3046 if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3047 r = SSH_ERR_LIBCRYPTO_ERROR;
3048 goto out;
3049 }
3050 rsa_p = rsa_q = NULL; /* transferred */
3051 if ((r = check_rsa_length(k->rsa)) != 0)
3052 goto out;
3053 if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3054 goto out;
3055 break;
3056 #endif /* WITH_OPENSSL */
3057 case KEY_ED25519:
3058 if ((k = sshkey_new_private(type)) == NULL) {
3059 r = SSH_ERR_ALLOC_FAIL;
3060 goto out;
3061 }
3062 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3063 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3064 goto out;
3065 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3066 r = SSH_ERR_INVALID_FORMAT;
3067 goto out;
3068 }
3069 k->ed25519_pk = ed25519_pk;
3070 k->ed25519_sk = ed25519_sk;
3071 ed25519_pk = ed25519_sk = NULL;
3072 break;
3073 case KEY_ED25519_CERT:
3074 if ((r = sshkey_froms(buf, &k)) != 0 ||
3075 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3076 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3077 goto out;
3078 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3079 r = SSH_ERR_INVALID_FORMAT;
3080 goto out;
3081 }
3082 k->ed25519_pk = ed25519_pk;
3083 k->ed25519_sk = ed25519_sk;
3084 ed25519_pk = ed25519_sk = NULL;
3085 break;
3086 #ifdef WITH_XMSS
3087 case KEY_XMSS:
3088 if ((k = sshkey_new_private(type)) == NULL) {
3089 r = SSH_ERR_ALLOC_FAIL;
3090 goto out;
3091 }
3092 if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3093 (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3094 (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3095 (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3096 goto out;
3097 if (pklen != sshkey_xmss_pklen(k) ||
3098 sklen != sshkey_xmss_sklen(k)) {
3099 r = SSH_ERR_INVALID_FORMAT;
3100 goto out;
3101 }
3102 k->xmss_pk = xmss_pk;
3103 k->xmss_sk = xmss_sk;
3104 xmss_pk = xmss_sk = NULL;
3105 /* optional internal state */
3106 if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3107 goto out;
3108 break;
3109 case KEY_XMSS_CERT:
3110 if ((r = sshkey_froms(buf, &k)) != 0 ||
3111 (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3112 (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3113 (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3114 goto out;
3115 if (strcmp(xmss_name, k->xmss_name)) {
3116 r = SSH_ERR_INVALID_FORMAT;
3117 goto out;
3118 }
3119 if (pklen != sshkey_xmss_pklen(k) ||
3120 sklen != sshkey_xmss_sklen(k)) {
3121 r = SSH_ERR_INVALID_FORMAT;
3122 goto out;
3123 }
3124 k->xmss_pk = xmss_pk;
3125 k->xmss_sk = xmss_sk;
3126 xmss_pk = xmss_sk = NULL;
3127 /* optional internal state */
3128 if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3129 goto out;
3130 break;
3131 #endif /* WITH_XMSS */
3132 default:
3133 r = SSH_ERR_KEY_TYPE_UNKNOWN;
3134 goto out;
3135 }
3136 #ifdef WITH_OPENSSL
3137 /* enable blinding */
3138 switch (k->type) {
3139 case KEY_RSA:
3140 case KEY_RSA_CERT:
3141 if (RSA_blinding_on(k->rsa, NULL) != 1) {
3142 r = SSH_ERR_LIBCRYPTO_ERROR;
3143 goto out;
3144 }
3145 break;
3146 }
3147 #endif /* WITH_OPENSSL */
3148 /* success */
3149 r = 0;
3150 if (kp != NULL) {
3151 *kp = k;
3152 k = NULL;
3153 }
3154 out:
3155 free(tname);
3156 free(curve);
3157 #ifdef WITH_OPENSSL
3158 BN_clear_free(exponent);
3159 BN_clear_free(dsa_p);
3160 BN_clear_free(dsa_q);
3161 BN_clear_free(dsa_g);
3162 BN_clear_free(dsa_pub_key);
3163 BN_clear_free(dsa_priv_key);
3164 BN_clear_free(rsa_n);
3165 BN_clear_free(rsa_e);
3166 BN_clear_free(rsa_d);
3167 BN_clear_free(rsa_p);
3168 BN_clear_free(rsa_q);
3169 BN_clear_free(rsa_iqmp);
3170 #endif /* WITH_OPENSSL */
3171 sshkey_free(k);
3172 freezero(ed25519_pk, pklen);
3173 freezero(ed25519_sk, sklen);
3174 free(xmss_name);
3175 freezero(xmss_pk, pklen);
3176 freezero(xmss_sk, sklen);
3177 return r;
3178 }
3179
3180 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
3181 int
sshkey_ec_validate_public(const EC_GROUP * group,const EC_POINT * public)3182 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3183 {
3184 BN_CTX *bnctx;
3185 EC_POINT *nq = NULL;
3186 BIGNUM *order, *x, *y, *tmp;
3187 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3188
3189 /*
3190 * NB. This assumes OpenSSL has already verified that the public
3191 * point lies on the curve. This is done by EC_POINT_oct2point()
3192 * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3193 * reachable with public points not unmarshalled using
3194 * EC_POINT_oct2point then the caller will need to explicitly check.
3195 */
3196
3197 if ((bnctx = BN_CTX_new()) == NULL)
3198 return SSH_ERR_ALLOC_FAIL;
3199 BN_CTX_start(bnctx);
3200
3201 /*
3202 * We shouldn't ever hit this case because bignum_get_ecpoint()
3203 * refuses to load GF2m points.
3204 */
3205 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3206 NID_X9_62_prime_field)
3207 goto out;
3208
3209 /* Q != infinity */
3210 if (EC_POINT_is_at_infinity(group, public))
3211 goto out;
3212
3213 if ((x = BN_CTX_get(bnctx)) == NULL ||
3214 (y = BN_CTX_get(bnctx)) == NULL ||
3215 (order = BN_CTX_get(bnctx)) == NULL ||
3216 (tmp = BN_CTX_get(bnctx)) == NULL) {
3217 ret = SSH_ERR_ALLOC_FAIL;
3218 goto out;
3219 }
3220
3221 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3222 if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3223 EC_POINT_get_affine_coordinates_GFp(group, public,
3224 x, y, bnctx) != 1) {
3225 ret = SSH_ERR_LIBCRYPTO_ERROR;
3226 goto out;
3227 }
3228 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3229 BN_num_bits(y) <= BN_num_bits(order) / 2)
3230 goto out;
3231
3232 /* nQ == infinity (n == order of subgroup) */
3233 if ((nq = EC_POINT_new(group)) == NULL) {
3234 ret = SSH_ERR_ALLOC_FAIL;
3235 goto out;
3236 }
3237 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3238 ret = SSH_ERR_LIBCRYPTO_ERROR;
3239 goto out;
3240 }
3241 if (EC_POINT_is_at_infinity(group, nq) != 1)
3242 goto out;
3243
3244 /* x < order - 1, y < order - 1 */
3245 if (!BN_sub(tmp, order, BN_value_one())) {
3246 ret = SSH_ERR_LIBCRYPTO_ERROR;
3247 goto out;
3248 }
3249 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3250 goto out;
3251 ret = 0;
3252 out:
3253 BN_CTX_free(bnctx);
3254 EC_POINT_free(nq);
3255 return ret;
3256 }
3257
3258 int
sshkey_ec_validate_private(const EC_KEY * key)3259 sshkey_ec_validate_private(const EC_KEY *key)
3260 {
3261 BN_CTX *bnctx;
3262 BIGNUM *order, *tmp;
3263 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3264
3265 if ((bnctx = BN_CTX_new()) == NULL)
3266 return SSH_ERR_ALLOC_FAIL;
3267 BN_CTX_start(bnctx);
3268
3269 if ((order = BN_CTX_get(bnctx)) == NULL ||
3270 (tmp = BN_CTX_get(bnctx)) == NULL) {
3271 ret = SSH_ERR_ALLOC_FAIL;
3272 goto out;
3273 }
3274
3275 /* log2(private) > log2(order)/2 */
3276 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3277 ret = SSH_ERR_LIBCRYPTO_ERROR;
3278 goto out;
3279 }
3280 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3281 BN_num_bits(order) / 2)
3282 goto out;
3283
3284 /* private < order - 1 */
3285 if (!BN_sub(tmp, order, BN_value_one())) {
3286 ret = SSH_ERR_LIBCRYPTO_ERROR;
3287 goto out;
3288 }
3289 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3290 goto out;
3291 ret = 0;
3292 out:
3293 BN_CTX_free(bnctx);
3294 return ret;
3295 }
3296
3297 void
sshkey_dump_ec_point(const EC_GROUP * group,const EC_POINT * point)3298 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3299 {
3300 BIGNUM *x, *y;
3301 BN_CTX *bnctx;
3302
3303 if (point == NULL) {
3304 fputs("point=(NULL)\n", stderr);
3305 return;
3306 }
3307 if ((bnctx = BN_CTX_new()) == NULL) {
3308 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3309 return;
3310 }
3311 BN_CTX_start(bnctx);
3312 if ((x = BN_CTX_get(bnctx)) == NULL ||
3313 (y = BN_CTX_get(bnctx)) == NULL) {
3314 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3315 return;
3316 }
3317 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3318 NID_X9_62_prime_field) {
3319 fprintf(stderr, "%s: group is not a prime field\n", __func__);
3320 return;
3321 }
3322 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3323 bnctx) != 1) {
3324 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3325 __func__);
3326 return;
3327 }
3328 fputs("x=", stderr);
3329 BN_print_fp(stderr, x);
3330 fputs("\ny=", stderr);
3331 BN_print_fp(stderr, y);
3332 fputs("\n", stderr);
3333 BN_CTX_free(bnctx);
3334 }
3335
3336 void
sshkey_dump_ec_key(const EC_KEY * key)3337 sshkey_dump_ec_key(const EC_KEY *key)
3338 {
3339 const BIGNUM *exponent;
3340
3341 sshkey_dump_ec_point(EC_KEY_get0_group(key),
3342 EC_KEY_get0_public_key(key));
3343 fputs("exponent=", stderr);
3344 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3345 fputs("(NULL)", stderr);
3346 else
3347 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3348 fputs("\n", stderr);
3349 }
3350 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
3351
3352 static int
sshkey_private_to_blob2(const struct sshkey * prv,struct sshbuf * blob,const char * passphrase,const char * comment,const char * ciphername,int rounds)3353 sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
3354 const char *passphrase, const char *comment, const char *ciphername,
3355 int rounds)
3356 {
3357 u_char *cp, *key = NULL, *pubkeyblob = NULL;
3358 u_char salt[SALT_LEN];
3359 char *b64 = NULL;
3360 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3361 u_int check;
3362 int r = SSH_ERR_INTERNAL_ERROR;
3363 struct sshcipher_ctx *ciphercontext = NULL;
3364 const struct sshcipher *cipher;
3365 const char *kdfname = KDFNAME;
3366 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3367
3368 if (rounds <= 0)
3369 rounds = DEFAULT_ROUNDS;
3370 if (passphrase == NULL || !strlen(passphrase)) {
3371 ciphername = "none";
3372 kdfname = "none";
3373 } else if (ciphername == NULL)
3374 ciphername = DEFAULT_CIPHERNAME;
3375 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3376 r = SSH_ERR_INVALID_ARGUMENT;
3377 goto out;
3378 }
3379
3380 if ((kdf = sshbuf_new()) == NULL ||
3381 (encoded = sshbuf_new()) == NULL ||
3382 (encrypted = sshbuf_new()) == NULL) {
3383 r = SSH_ERR_ALLOC_FAIL;
3384 goto out;
3385 }
3386 blocksize = cipher_blocksize(cipher);
3387 keylen = cipher_keylen(cipher);
3388 ivlen = cipher_ivlen(cipher);
3389 authlen = cipher_authlen(cipher);
3390 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3391 r = SSH_ERR_ALLOC_FAIL;
3392 goto out;
3393 }
3394 if (strcmp(kdfname, "bcrypt") == 0) {
3395 arc4random_buf(salt, SALT_LEN);
3396 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3397 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3398 r = SSH_ERR_INVALID_ARGUMENT;
3399 goto out;
3400 }
3401 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3402 (r = sshbuf_put_u32(kdf, rounds)) != 0)
3403 goto out;
3404 } else if (strcmp(kdfname, "none") != 0) {
3405 /* Unsupported KDF type */
3406 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3407 goto out;
3408 }
3409 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3410 key + keylen, ivlen, 1)) != 0)
3411 goto out;
3412
3413 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3414 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3415 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3416 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3417 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3418 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3419 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3420 goto out;
3421
3422 /* set up the buffer that will be encrypted */
3423
3424 /* Random check bytes */
3425 check = arc4random();
3426 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3427 (r = sshbuf_put_u32(encrypted, check)) != 0)
3428 goto out;
3429
3430 /* append private key and comment*/
3431 if ((r = sshkey_private_serialize_opt(prv, encrypted,
3432 SSHKEY_SERIALIZE_FULL)) != 0 ||
3433 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3434 goto out;
3435
3436 /* padding */
3437 i = 0;
3438 while (sshbuf_len(encrypted) % blocksize) {
3439 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3440 goto out;
3441 }
3442
3443 /* length in destination buffer */
3444 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3445 goto out;
3446
3447 /* encrypt */
3448 if ((r = sshbuf_reserve(encoded,
3449 sshbuf_len(encrypted) + authlen, &cp)) != 0)
3450 goto out;
3451 if ((r = cipher_crypt(ciphercontext, 0, cp,
3452 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3453 goto out;
3454
3455 /* uuencode */
3456 if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3457 r = SSH_ERR_ALLOC_FAIL;
3458 goto out;
3459 }
3460
3461 sshbuf_reset(blob);
3462 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3463 goto out;
3464 for (i = 0; i < strlen(b64); i++) {
3465 if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3466 goto out;
3467 /* insert line breaks */
3468 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3469 goto out;
3470 }
3471 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3472 goto out;
3473 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3474 goto out;
3475
3476 /* success */
3477 r = 0;
3478
3479 out:
3480 sshbuf_free(kdf);
3481 sshbuf_free(encoded);
3482 sshbuf_free(encrypted);
3483 cipher_free(ciphercontext);
3484 explicit_bzero(salt, sizeof(salt));
3485 if (key != NULL) {
3486 explicit_bzero(key, keylen + ivlen);
3487 free(key);
3488 }
3489 if (pubkeyblob != NULL) {
3490 explicit_bzero(pubkeyblob, pubkeylen);
3491 free(pubkeyblob);
3492 }
3493 if (b64 != NULL) {
3494 explicit_bzero(b64, strlen(b64));
3495 free(b64);
3496 }
3497 return r;
3498 }
3499
3500 static int
sshkey_parse_private2(struct sshbuf * blob,int type,const char * passphrase,struct sshkey ** keyp,char ** commentp)3501 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3502 struct sshkey **keyp, char **commentp)
3503 {
3504 char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3505 const struct sshcipher *cipher = NULL;
3506 const u_char *cp;
3507 int r = SSH_ERR_INTERNAL_ERROR;
3508 size_t encoded_len;
3509 size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3510 struct sshbuf *encoded = NULL, *decoded = NULL;
3511 struct sshbuf *kdf = NULL, *decrypted = NULL;
3512 struct sshcipher_ctx *ciphercontext = NULL;
3513 struct sshkey *k = NULL;
3514 u_char *key = NULL, *salt = NULL, *dp, pad, last;
3515 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3516
3517 if (keyp != NULL)
3518 *keyp = NULL;
3519 if (commentp != NULL)
3520 *commentp = NULL;
3521
3522 if ((encoded = sshbuf_new()) == NULL ||
3523 (decoded = sshbuf_new()) == NULL ||
3524 (decrypted = sshbuf_new()) == NULL) {
3525 r = SSH_ERR_ALLOC_FAIL;
3526 goto out;
3527 }
3528
3529 /* check preamble */
3530 cp = sshbuf_ptr(blob);
3531 encoded_len = sshbuf_len(blob);
3532 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3533 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3534 r = SSH_ERR_INVALID_FORMAT;
3535 goto out;
3536 }
3537 cp += MARK_BEGIN_LEN;
3538 encoded_len -= MARK_BEGIN_LEN;
3539
3540 /* Look for end marker, removing whitespace as we go */
3541 while (encoded_len > 0) {
3542 if (*cp != '\n' && *cp != '\r') {
3543 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3544 goto out;
3545 }
3546 last = *cp;
3547 encoded_len--;
3548 cp++;
3549 if (last == '\n') {
3550 if (encoded_len >= MARK_END_LEN &&
3551 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3552 /* \0 terminate */
3553 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3554 goto out;
3555 break;
3556 }
3557 }
3558 }
3559 if (encoded_len == 0) {
3560 r = SSH_ERR_INVALID_FORMAT;
3561 goto out;
3562 }
3563
3564 /* decode base64 */
3565 if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
3566 goto out;
3567
3568 /* check magic */
3569 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3570 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3571 r = SSH_ERR_INVALID_FORMAT;
3572 goto out;
3573 }
3574 /* parse public portion of key */
3575 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3576 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3577 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3578 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3579 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3580 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3581 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3582 goto out;
3583
3584 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3585 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3586 goto out;
3587 }
3588 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3589 strcmp(ciphername, "none") != 0) {
3590 /* passphrase required */
3591 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3592 goto out;
3593 }
3594 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3595 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3596 goto out;
3597 }
3598 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3599 r = SSH_ERR_INVALID_FORMAT;
3600 goto out;
3601 }
3602 if (nkeys != 1) {
3603 /* XXX only one key supported */
3604 r = SSH_ERR_INVALID_FORMAT;
3605 goto out;
3606 }
3607
3608 /* check size of encrypted key blob */
3609 blocksize = cipher_blocksize(cipher);
3610 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3611 r = SSH_ERR_INVALID_FORMAT;
3612 goto out;
3613 }
3614
3615 /* setup key */
3616 keylen = cipher_keylen(cipher);
3617 ivlen = cipher_ivlen(cipher);
3618 authlen = cipher_authlen(cipher);
3619 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3620 r = SSH_ERR_ALLOC_FAIL;
3621 goto out;
3622 }
3623 if (strcmp(kdfname, "bcrypt") == 0) {
3624 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3625 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3626 goto out;
3627 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3628 key, keylen + ivlen, rounds) < 0) {
3629 r = SSH_ERR_INVALID_FORMAT;
3630 goto out;
3631 }
3632 }
3633
3634 /* check that an appropriate amount of auth data is present */
3635 if (sshbuf_len(decoded) < encrypted_len + authlen) {
3636 r = SSH_ERR_INVALID_FORMAT;
3637 goto out;
3638 }
3639
3640 /* decrypt private portion of key */
3641 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3642 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3643 key + keylen, ivlen, 0)) != 0)
3644 goto out;
3645 if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
3646 encrypted_len, 0, authlen)) != 0) {
3647 /* an integrity error here indicates an incorrect passphrase */
3648 if (r == SSH_ERR_MAC_INVALID)
3649 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3650 goto out;
3651 }
3652 if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
3653 goto out;
3654 /* there should be no trailing data */
3655 if (sshbuf_len(decoded) != 0) {
3656 r = SSH_ERR_INVALID_FORMAT;
3657 goto out;
3658 }
3659
3660 /* check check bytes */
3661 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3662 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3663 goto out;
3664 if (check1 != check2) {
3665 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3666 goto out;
3667 }
3668
3669 /* Load the private key and comment */
3670 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3671 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3672 goto out;
3673
3674 /* Check deterministic padding */
3675 i = 0;
3676 while (sshbuf_len(decrypted)) {
3677 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3678 goto out;
3679 if (pad != (++i & 0xff)) {
3680 r = SSH_ERR_INVALID_FORMAT;
3681 goto out;
3682 }
3683 }
3684
3685 /* XXX decode pubkey and check against private */
3686
3687 /* success */
3688 r = 0;
3689 if (keyp != NULL) {
3690 *keyp = k;
3691 k = NULL;
3692 }
3693 if (commentp != NULL) {
3694 *commentp = comment;
3695 comment = NULL;
3696 }
3697 out:
3698 pad = 0;
3699 cipher_free(ciphercontext);
3700 free(ciphername);
3701 free(kdfname);
3702 free(comment);
3703 if (salt != NULL) {
3704 explicit_bzero(salt, slen);
3705 free(salt);
3706 }
3707 if (key != NULL) {
3708 explicit_bzero(key, keylen + ivlen);
3709 free(key);
3710 }
3711 sshbuf_free(encoded);
3712 sshbuf_free(decoded);
3713 sshbuf_free(kdf);
3714 sshbuf_free(decrypted);
3715 sshkey_free(k);
3716 return r;
3717 }
3718
3719
3720 #ifdef WITH_OPENSSL
3721 /* convert SSH v2 key in OpenSSL PEM format */
3722 static int
sshkey_private_pem_to_blob(struct sshkey * key,struct sshbuf * blob,const char * _passphrase,const char * comment)3723 sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3724 const char *_passphrase, const char *comment)
3725 {
3726 int success, r;
3727 int blen, len = strlen(_passphrase);
3728 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3729 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3730 char *bptr;
3731 BIO *bio = NULL;
3732
3733 if (len > 0 && len <= 4)
3734 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3735 if ((bio = BIO_new(BIO_s_mem())) == NULL)
3736 return SSH_ERR_ALLOC_FAIL;
3737
3738 switch (key->type) {
3739 case KEY_DSA:
3740 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3741 cipher, passphrase, len, NULL, NULL);
3742 break;
3743 #ifdef OPENSSL_HAS_ECC
3744 case KEY_ECDSA:
3745 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3746 cipher, passphrase, len, NULL, NULL);
3747 break;
3748 #endif
3749 case KEY_RSA:
3750 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3751 cipher, passphrase, len, NULL, NULL);
3752 break;
3753 default:
3754 success = 0;
3755 break;
3756 }
3757 if (success == 0) {
3758 r = SSH_ERR_LIBCRYPTO_ERROR;
3759 goto out;
3760 }
3761 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3762 r = SSH_ERR_INTERNAL_ERROR;
3763 goto out;
3764 }
3765 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3766 goto out;
3767 r = 0;
3768 out:
3769 BIO_free(bio);
3770 return r;
3771 }
3772 #endif /* WITH_OPENSSL */
3773
3774 /* Serialise "key" to buffer "blob" */
3775 int
sshkey_private_to_fileblob(struct sshkey * key,struct sshbuf * blob,const char * passphrase,const char * comment,int force_new_format,const char * new_format_cipher,int new_format_rounds)3776 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3777 const char *passphrase, const char *comment,
3778 int force_new_format, const char *new_format_cipher, int new_format_rounds)
3779 {
3780 switch (key->type) {
3781 #ifdef WITH_OPENSSL
3782 case KEY_DSA:
3783 case KEY_ECDSA:
3784 case KEY_RSA:
3785 if (force_new_format) {
3786 return sshkey_private_to_blob2(key, blob, passphrase,
3787 comment, new_format_cipher, new_format_rounds);
3788 }
3789 return sshkey_private_pem_to_blob(key, blob,
3790 passphrase, comment);
3791 #endif /* WITH_OPENSSL */
3792 case KEY_ED25519:
3793 #ifdef WITH_XMSS
3794 case KEY_XMSS:
3795 #endif /* WITH_XMSS */
3796 return sshkey_private_to_blob2(key, blob, passphrase,
3797 comment, new_format_cipher, new_format_rounds);
3798 default:
3799 return SSH_ERR_KEY_TYPE_UNKNOWN;
3800 }
3801 }
3802
3803
3804 #ifdef WITH_OPENSSL
3805 static int
translate_libcrypto_error(unsigned long pem_err)3806 translate_libcrypto_error(unsigned long pem_err)
3807 {
3808 int pem_reason = ERR_GET_REASON(pem_err);
3809
3810 switch (ERR_GET_LIB(pem_err)) {
3811 case ERR_LIB_PEM:
3812 switch (pem_reason) {
3813 case PEM_R_BAD_PASSWORD_READ:
3814 case PEM_R_PROBLEMS_GETTING_PASSWORD:
3815 case PEM_R_BAD_DECRYPT:
3816 return SSH_ERR_KEY_WRONG_PASSPHRASE;
3817 default:
3818 return SSH_ERR_INVALID_FORMAT;
3819 }
3820 case ERR_LIB_EVP:
3821 switch (pem_reason) {
3822 case EVP_R_BAD_DECRYPT:
3823 return SSH_ERR_KEY_WRONG_PASSPHRASE;
3824 #ifdef EVP_R_BN_DECODE_ERROR
3825 case EVP_R_BN_DECODE_ERROR:
3826 #endif
3827 case EVP_R_DECODE_ERROR:
3828 #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3829 case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3830 #endif
3831 return SSH_ERR_INVALID_FORMAT;
3832 default:
3833 return SSH_ERR_LIBCRYPTO_ERROR;
3834 }
3835 case ERR_LIB_ASN1:
3836 return SSH_ERR_INVALID_FORMAT;
3837 }
3838 return SSH_ERR_LIBCRYPTO_ERROR;
3839 }
3840
3841 static void
clear_libcrypto_errors(void)3842 clear_libcrypto_errors(void)
3843 {
3844 while (ERR_get_error() != 0)
3845 ;
3846 }
3847
3848 /*
3849 * Translate OpenSSL error codes to determine whether
3850 * passphrase is required/incorrect.
3851 */
3852 static int
convert_libcrypto_error(void)3853 convert_libcrypto_error(void)
3854 {
3855 /*
3856 * Some password errors are reported at the beginning
3857 * of the error queue.
3858 */
3859 if (translate_libcrypto_error(ERR_peek_error()) ==
3860 SSH_ERR_KEY_WRONG_PASSPHRASE)
3861 return SSH_ERR_KEY_WRONG_PASSPHRASE;
3862 return translate_libcrypto_error(ERR_peek_last_error());
3863 }
3864
3865 static int
sshkey_parse_private_pem_fileblob(struct sshbuf * blob,int type,const char * passphrase,struct sshkey ** keyp)3866 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3867 const char *passphrase, struct sshkey **keyp)
3868 {
3869 EVP_PKEY *pk = NULL;
3870 struct sshkey *prv = NULL;
3871 BIO *bio = NULL;
3872 int r;
3873
3874 if (keyp != NULL)
3875 *keyp = NULL;
3876
3877 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3878 return SSH_ERR_ALLOC_FAIL;
3879 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3880 (int)sshbuf_len(blob)) {
3881 r = SSH_ERR_ALLOC_FAIL;
3882 goto out;
3883 }
3884
3885 clear_libcrypto_errors();
3886 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3887 (char *)passphrase)) == NULL) {
3888 r = convert_libcrypto_error();
3889 goto out;
3890 }
3891 if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
3892 (type == KEY_UNSPEC || type == KEY_RSA)) {
3893 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3894 r = SSH_ERR_ALLOC_FAIL;
3895 goto out;
3896 }
3897 prv->rsa = EVP_PKEY_get1_RSA(pk);
3898 prv->type = KEY_RSA;
3899 #ifdef DEBUG_PK
3900 RSA_print_fp(stderr, prv->rsa, 8);
3901 #endif
3902 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3903 r = SSH_ERR_LIBCRYPTO_ERROR;
3904 goto out;
3905 }
3906 if ((r = check_rsa_length(prv->rsa)) != 0)
3907 goto out;
3908 } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
3909 (type == KEY_UNSPEC || type == KEY_DSA)) {
3910 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3911 r = SSH_ERR_ALLOC_FAIL;
3912 goto out;
3913 }
3914 prv->dsa = EVP_PKEY_get1_DSA(pk);
3915 prv->type = KEY_DSA;
3916 #ifdef DEBUG_PK
3917 DSA_print_fp(stderr, prv->dsa, 8);
3918 #endif
3919 #ifdef OPENSSL_HAS_ECC
3920 } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
3921 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3922 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3923 r = SSH_ERR_ALLOC_FAIL;
3924 goto out;
3925 }
3926 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3927 prv->type = KEY_ECDSA;
3928 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3929 if (prv->ecdsa_nid == -1 ||
3930 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3931 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3932 EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3933 sshkey_ec_validate_private(prv->ecdsa) != 0) {
3934 r = SSH_ERR_INVALID_FORMAT;
3935 goto out;
3936 }
3937 # ifdef DEBUG_PK
3938 if (prv != NULL && prv->ecdsa != NULL)
3939 sshkey_dump_ec_key(prv->ecdsa);
3940 # endif
3941 #endif /* OPENSSL_HAS_ECC */
3942 } else {
3943 r = SSH_ERR_INVALID_FORMAT;
3944 goto out;
3945 }
3946 r = 0;
3947 if (keyp != NULL) {
3948 *keyp = prv;
3949 prv = NULL;
3950 }
3951 out:
3952 BIO_free(bio);
3953 EVP_PKEY_free(pk);
3954 sshkey_free(prv);
3955 return r;
3956 }
3957 #endif /* WITH_OPENSSL */
3958
3959 int
sshkey_parse_private_fileblob_type(struct sshbuf * blob,int type,const char * passphrase,struct sshkey ** keyp,char ** commentp)3960 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3961 const char *passphrase, struct sshkey **keyp, char **commentp)
3962 {
3963 int r = SSH_ERR_INTERNAL_ERROR;
3964
3965 if (keyp != NULL)
3966 *keyp = NULL;
3967 if (commentp != NULL)
3968 *commentp = NULL;
3969
3970 switch (type) {
3971 #ifdef WITH_OPENSSL
3972 case KEY_DSA:
3973 case KEY_ECDSA:
3974 case KEY_RSA:
3975 return sshkey_parse_private_pem_fileblob(blob, type,
3976 passphrase, keyp);
3977 #endif /* WITH_OPENSSL */
3978 case KEY_ED25519:
3979 #ifdef WITH_XMSS
3980 case KEY_XMSS:
3981 #endif /* WITH_XMSS */
3982 return sshkey_parse_private2(blob, type, passphrase,
3983 keyp, commentp);
3984 case KEY_UNSPEC:
3985 r = sshkey_parse_private2(blob, type, passphrase, keyp,
3986 commentp);
3987 /* Do not fallback to PEM parser if only passphrase is wrong. */
3988 if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
3989 return r;
3990 #ifdef WITH_OPENSSL
3991 return sshkey_parse_private_pem_fileblob(blob, type,
3992 passphrase, keyp);
3993 #else
3994 return SSH_ERR_INVALID_FORMAT;
3995 #endif /* WITH_OPENSSL */
3996 default:
3997 return SSH_ERR_KEY_TYPE_UNKNOWN;
3998 }
3999 }
4000
4001 int
sshkey_parse_private_fileblob(struct sshbuf * buffer,const char * passphrase,struct sshkey ** keyp,char ** commentp)4002 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
4003 struct sshkey **keyp, char **commentp)
4004 {
4005 if (keyp != NULL)
4006 *keyp = NULL;
4007 if (commentp != NULL)
4008 *commentp = NULL;
4009
4010 return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4011 passphrase, keyp, commentp);
4012 }
4013
4014 #ifdef WITH_XMSS
4015 /*
4016 * serialize the key with the current state and forward the state
4017 * maxsign times.
4018 */
4019 int
sshkey_private_serialize_maxsign(const struct sshkey * k,struct sshbuf * b,u_int32_t maxsign,sshkey_printfn * pr)4020 sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4021 u_int32_t maxsign, sshkey_printfn *pr)
4022 {
4023 int r, rupdate;
4024
4025 if (maxsign == 0 ||
4026 sshkey_type_plain(k->type) != KEY_XMSS)
4027 return sshkey_private_serialize_opt(k, b,
4028 SSHKEY_SERIALIZE_DEFAULT);
4029 if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4030 (r = sshkey_private_serialize_opt(k, b,
4031 SSHKEY_SERIALIZE_STATE)) != 0 ||
4032 (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4033 goto out;
4034 r = 0;
4035 out:
4036 if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4037 if (r == 0)
4038 r = rupdate;
4039 }
4040 return r;
4041 }
4042
4043 u_int32_t
sshkey_signatures_left(const struct sshkey * k)4044 sshkey_signatures_left(const struct sshkey *k)
4045 {
4046 if (sshkey_type_plain(k->type) == KEY_XMSS)
4047 return sshkey_xmss_signatures_left(k);
4048 return 0;
4049 }
4050
4051 int
sshkey_enable_maxsign(struct sshkey * k,u_int32_t maxsign)4052 sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4053 {
4054 if (sshkey_type_plain(k->type) != KEY_XMSS)
4055 return SSH_ERR_INVALID_ARGUMENT;
4056 return sshkey_xmss_enable_maxsign(k, maxsign);
4057 }
4058
4059 int
sshkey_set_filename(struct sshkey * k,const char * filename)4060 sshkey_set_filename(struct sshkey *k, const char *filename)
4061 {
4062 if (k == NULL)
4063 return SSH_ERR_INVALID_ARGUMENT;
4064 if (sshkey_type_plain(k->type) != KEY_XMSS)
4065 return 0;
4066 if (filename == NULL)
4067 return SSH_ERR_INVALID_ARGUMENT;
4068 if ((k->xmss_filename = strdup(filename)) == NULL)
4069 return SSH_ERR_ALLOC_FAIL;
4070 return 0;
4071 }
4072 #else
4073 int
sshkey_private_serialize_maxsign(const struct sshkey * k,struct sshbuf * b,u_int32_t maxsign,sshkey_printfn * pr)4074 sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4075 u_int32_t maxsign, sshkey_printfn *pr)
4076 {
4077 return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4078 }
4079
4080 u_int32_t
sshkey_signatures_left(const struct sshkey * k)4081 sshkey_signatures_left(const struct sshkey *k)
4082 {
4083 return 0;
4084 }
4085
4086 int
sshkey_enable_maxsign(struct sshkey * k,u_int32_t maxsign)4087 sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4088 {
4089 return SSH_ERR_INVALID_ARGUMENT;
4090 }
4091
4092 int
sshkey_set_filename(struct sshkey * k,const char * filename)4093 sshkey_set_filename(struct sshkey *k, const char *filename)
4094 {
4095 if (k == NULL)
4096 return SSH_ERR_INVALID_ARGUMENT;
4097 return 0;
4098 }
4099 #endif /* WITH_XMSS */
4100