Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.58
1.58 ! djm 1: /* $OpenBSD: sshkey.c,v 1.57 2017/10/13 06:24:51 djm Exp $ */
1.1 djm 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 <sys/types.h>
1.7 djm 29: #include <netinet/in.h>
1.1 djm 30:
1.12 djm 31: #ifdef WITH_OPENSSL
1.1 djm 32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
1.12 djm 35: #endif
1.1 djm 36:
37: #include "crypto_api.h"
38:
39: #include <errno.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <util.h>
1.13 deraadt 43: #include <limits.h>
1.7 djm 44: #include <resolv.h>
1.1 djm 45:
46: #include "ssh2.h"
47: #include "ssherr.h"
48: #include "misc.h"
49: #include "sshbuf.h"
50: #include "cipher.h"
51: #include "digest.h"
52: #define SSHKEY_INTERNAL
53: #include "sshkey.h"
1.11 djm 54: #include "match.h"
1.1 djm 55:
56: /* openssh private key file format */
57: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
58: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
59: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
60: #define MARK_END_LEN (sizeof(MARK_END) - 1)
61: #define KDFNAME "bcrypt"
62: #define AUTH_MAGIC "openssh-key-v1"
63: #define SALT_LEN 16
1.56 djm 64: #define DEFAULT_CIPHERNAME "aes256-ctr"
1.1 djm 65: #define DEFAULT_ROUNDS 16
66:
67: /* Version identification string for SSH v1 identity files. */
68: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
69:
1.14 djm 70: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 71: struct sshkey **keyp, int allow_cert);
72:
73: /* Supported key types */
74: struct keytype {
75: const char *name;
76: const char *shortname;
77: int type;
78: int nid;
79: int cert;
1.28 markus 80: int sigonly;
1.1 djm 81: };
82: static const struct keytype keytypes[] = {
1.28 markus 83: { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0, 0 },
1.1 djm 84: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
1.28 markus 85: KEY_ED25519_CERT, 0, 1, 0 },
1.1 djm 86: #ifdef WITH_OPENSSL
1.28 markus 87: { "ssh-rsa", "RSA", KEY_RSA, 0, 0, 0 },
88: { "rsa-sha2-256", "RSA", KEY_RSA, 0, 0, 1 },
89: { "rsa-sha2-512", "RSA", KEY_RSA, 0, 0, 1 },
90: { "ssh-dss", "DSA", KEY_DSA, 0, 0, 0 },
91: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
92: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0, 0 },
93: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0, 0 },
94: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1, 0 },
95: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1, 0 },
1.1 djm 96: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 97: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.1 djm 98: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 99: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.1 djm 100: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 101: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.1 djm 102: #endif /* WITH_OPENSSL */
1.28 markus 103: { NULL, NULL, -1, -1, 0, 0 }
1.1 djm 104: };
105:
106: const char *
107: sshkey_type(const struct sshkey *k)
108: {
109: const struct keytype *kt;
110:
111: for (kt = keytypes; kt->type != -1; kt++) {
112: if (kt->type == k->type)
113: return kt->shortname;
114: }
115: return "unknown";
116: }
117:
118: static const char *
119: sshkey_ssh_name_from_type_nid(int type, int nid)
120: {
121: const struct keytype *kt;
122:
123: for (kt = keytypes; kt->type != -1; kt++) {
124: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
125: return kt->name;
126: }
127: return "ssh-unknown";
128: }
129:
130: int
131: sshkey_type_is_cert(int type)
132: {
133: const struct keytype *kt;
134:
135: for (kt = keytypes; kt->type != -1; kt++) {
136: if (kt->type == type)
137: return kt->cert;
138: }
139: return 0;
140: }
141:
142: const char *
143: sshkey_ssh_name(const struct sshkey *k)
144: {
145: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
146: }
147:
148: const char *
149: sshkey_ssh_name_plain(const struct sshkey *k)
150: {
151: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
152: k->ecdsa_nid);
153: }
154:
155: int
156: sshkey_type_from_name(const char *name)
157: {
158: const struct keytype *kt;
159:
160: for (kt = keytypes; kt->type != -1; kt++) {
161: /* Only allow shortname matches for plain key types */
162: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
163: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
164: return kt->type;
165: }
166: return KEY_UNSPEC;
167: }
168:
169: int
170: sshkey_ecdsa_nid_from_name(const char *name)
171: {
172: const struct keytype *kt;
173:
1.4 djm 174: for (kt = keytypes; kt->type != -1; kt++) {
175: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
176: continue;
177: if (kt->name != NULL && strcmp(name, kt->name) == 0)
178: return kt->nid;
179: }
1.1 djm 180: return -1;
181: }
182:
183: char *
1.45 djm 184: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 185: {
186: char *tmp, *ret = NULL;
187: size_t nlen, rlen = 0;
188: const struct keytype *kt;
189:
190: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 191: if (kt->name == NULL)
192: continue;
193: if (!include_sigonly && kt->sigonly)
1.1 djm 194: continue;
195: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
196: continue;
197: if (ret != NULL)
1.38 djm 198: ret[rlen++] = sep;
1.1 djm 199: nlen = strlen(kt->name);
200: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
201: free(ret);
202: return NULL;
203: }
204: ret = tmp;
205: memcpy(ret + rlen, kt->name, nlen + 1);
206: rlen += nlen;
207: }
208: return ret;
209: }
210:
211: int
1.11 djm 212: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 213: {
214: char *s, *cp, *p;
1.11 djm 215: const struct keytype *kt;
216: int type;
1.1 djm 217:
218: if (names == NULL || strcmp(names, "") == 0)
219: return 0;
220: if ((s = cp = strdup(names)) == NULL)
221: return 0;
222: for ((p = strsep(&cp, ",")); p && *p != '\0';
223: (p = strsep(&cp, ","))) {
1.11 djm 224: type = sshkey_type_from_name(p);
225: if (type == KEY_UNSPEC) {
226: if (allow_wildcard) {
227: /*
228: * Try matching key types against the string.
229: * If any has a positive or negative match then
230: * the component is accepted.
231: */
232: for (kt = keytypes; kt->type != -1; kt++) {
233: if (match_pattern_list(kt->name,
1.17 djm 234: p, 0) != 0)
1.11 djm 235: break;
236: }
237: if (kt->type != -1)
238: continue;
239: }
1.1 djm 240: free(s);
241: return 0;
242: }
243: }
244: free(s);
245: return 1;
246: }
247:
248: u_int
249: sshkey_size(const struct sshkey *k)
250: {
251: switch (k->type) {
252: #ifdef WITH_OPENSSL
253: case KEY_RSA:
254: case KEY_RSA_CERT:
255: return BN_num_bits(k->rsa->n);
256: case KEY_DSA:
257: case KEY_DSA_CERT:
258: return BN_num_bits(k->dsa->p);
259: case KEY_ECDSA:
260: case KEY_ECDSA_CERT:
261: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
262: #endif /* WITH_OPENSSL */
263: case KEY_ED25519:
264: case KEY_ED25519_CERT:
265: return 256; /* XXX */
266: }
267: return 0;
268: }
269:
270: static int
271: sshkey_type_is_valid_ca(int type)
272: {
273: switch (type) {
274: case KEY_RSA:
275: case KEY_DSA:
276: case KEY_ECDSA:
277: case KEY_ED25519:
278: return 1;
279: default:
280: return 0;
281: }
282: }
283:
284: int
285: sshkey_is_cert(const struct sshkey *k)
286: {
287: if (k == NULL)
288: return 0;
289: return sshkey_type_is_cert(k->type);
290: }
291:
292: /* Return the cert-less equivalent to a certified key type */
293: int
294: sshkey_type_plain(int type)
295: {
296: switch (type) {
297: case KEY_RSA_CERT:
298: return KEY_RSA;
299: case KEY_DSA_CERT:
300: return KEY_DSA;
301: case KEY_ECDSA_CERT:
302: return KEY_ECDSA;
303: case KEY_ED25519_CERT:
304: return KEY_ED25519;
305: default:
306: return type;
307: }
308: }
309:
310: #ifdef WITH_OPENSSL
311: /* XXX: these are really begging for a table-driven approach */
312: int
313: sshkey_curve_name_to_nid(const char *name)
314: {
315: if (strcmp(name, "nistp256") == 0)
316: return NID_X9_62_prime256v1;
317: else if (strcmp(name, "nistp384") == 0)
318: return NID_secp384r1;
319: else if (strcmp(name, "nistp521") == 0)
320: return NID_secp521r1;
321: else
322: return -1;
323: }
324:
325: u_int
326: sshkey_curve_nid_to_bits(int nid)
327: {
328: switch (nid) {
329: case NID_X9_62_prime256v1:
330: return 256;
331: case NID_secp384r1:
332: return 384;
333: case NID_secp521r1:
334: return 521;
335: default:
336: return 0;
337: }
338: }
339:
340: int
341: sshkey_ecdsa_bits_to_nid(int bits)
342: {
343: switch (bits) {
344: case 256:
345: return NID_X9_62_prime256v1;
346: case 384:
347: return NID_secp384r1;
348: case 521:
349: return NID_secp521r1;
350: default:
351: return -1;
352: }
353: }
354:
355: const char *
356: sshkey_curve_nid_to_name(int nid)
357: {
358: switch (nid) {
359: case NID_X9_62_prime256v1:
360: return "nistp256";
361: case NID_secp384r1:
362: return "nistp384";
363: case NID_secp521r1:
364: return "nistp521";
365: default:
366: return NULL;
367: }
368: }
369:
370: int
371: sshkey_ec_nid_to_hash_alg(int nid)
372: {
373: int kbits = sshkey_curve_nid_to_bits(nid);
374:
375: if (kbits <= 0)
376: return -1;
377:
378: /* RFC5656 section 6.2.1 */
379: if (kbits <= 256)
380: return SSH_DIGEST_SHA256;
381: else if (kbits <= 384)
382: return SSH_DIGEST_SHA384;
383: else
384: return SSH_DIGEST_SHA512;
385: }
386: #endif /* WITH_OPENSSL */
387:
388: static void
389: cert_free(struct sshkey_cert *cert)
390: {
391: u_int i;
392:
393: if (cert == NULL)
394: return;
1.31 mmcc 395: sshbuf_free(cert->certblob);
396: sshbuf_free(cert->critical);
397: sshbuf_free(cert->extensions);
1.29 mmcc 398: free(cert->key_id);
1.1 djm 399: for (i = 0; i < cert->nprincipals; i++)
400: free(cert->principals[i]);
1.29 mmcc 401: free(cert->principals);
1.30 mmcc 402: sshkey_free(cert->signature_key);
1.1 djm 403: explicit_bzero(cert, sizeof(*cert));
404: free(cert);
405: }
406:
407: static struct sshkey_cert *
408: cert_new(void)
409: {
410: struct sshkey_cert *cert;
411:
412: if ((cert = calloc(1, sizeof(*cert))) == NULL)
413: return NULL;
414: if ((cert->certblob = sshbuf_new()) == NULL ||
415: (cert->critical = sshbuf_new()) == NULL ||
416: (cert->extensions = sshbuf_new()) == NULL) {
417: cert_free(cert);
418: return NULL;
419: }
420: cert->key_id = NULL;
421: cert->principals = NULL;
422: cert->signature_key = NULL;
423: return cert;
424: }
425:
426: struct sshkey *
427: sshkey_new(int type)
428: {
429: struct sshkey *k;
430: #ifdef WITH_OPENSSL
431: RSA *rsa;
432: DSA *dsa;
433: #endif /* WITH_OPENSSL */
434:
435: if ((k = calloc(1, sizeof(*k))) == NULL)
436: return NULL;
437: k->type = type;
438: k->ecdsa = NULL;
439: k->ecdsa_nid = -1;
440: k->dsa = NULL;
441: k->rsa = NULL;
442: k->cert = NULL;
443: k->ed25519_sk = NULL;
444: k->ed25519_pk = NULL;
445: switch (k->type) {
446: #ifdef WITH_OPENSSL
447: case KEY_RSA:
448: case KEY_RSA_CERT:
449: if ((rsa = RSA_new()) == NULL ||
450: (rsa->n = BN_new()) == NULL ||
451: (rsa->e = BN_new()) == NULL) {
452: if (rsa != NULL)
453: RSA_free(rsa);
454: free(k);
455: return NULL;
456: }
457: k->rsa = rsa;
458: break;
459: case KEY_DSA:
460: case KEY_DSA_CERT:
461: if ((dsa = DSA_new()) == NULL ||
462: (dsa->p = BN_new()) == NULL ||
463: (dsa->q = BN_new()) == NULL ||
464: (dsa->g = BN_new()) == NULL ||
465: (dsa->pub_key = BN_new()) == NULL) {
466: if (dsa != NULL)
467: DSA_free(dsa);
468: free(k);
469: return NULL;
470: }
471: k->dsa = dsa;
472: break;
473: case KEY_ECDSA:
474: case KEY_ECDSA_CERT:
475: /* Cannot do anything until we know the group */
476: break;
477: #endif /* WITH_OPENSSL */
478: case KEY_ED25519:
479: case KEY_ED25519_CERT:
480: /* no need to prealloc */
481: break;
482: case KEY_UNSPEC:
483: break;
484: default:
485: free(k);
486: return NULL;
487: }
488:
489: if (sshkey_is_cert(k)) {
490: if ((k->cert = cert_new()) == NULL) {
491: sshkey_free(k);
492: return NULL;
493: }
494: }
495:
496: return k;
497: }
498:
499: int
500: sshkey_add_private(struct sshkey *k)
501: {
502: switch (k->type) {
503: #ifdef WITH_OPENSSL
504: case KEY_RSA:
505: case KEY_RSA_CERT:
506: #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
507: if (bn_maybe_alloc_failed(k->rsa->d) ||
508: bn_maybe_alloc_failed(k->rsa->iqmp) ||
509: bn_maybe_alloc_failed(k->rsa->q) ||
510: bn_maybe_alloc_failed(k->rsa->p) ||
511: bn_maybe_alloc_failed(k->rsa->dmq1) ||
512: bn_maybe_alloc_failed(k->rsa->dmp1))
513: return SSH_ERR_ALLOC_FAIL;
514: break;
515: case KEY_DSA:
516: case KEY_DSA_CERT:
517: if (bn_maybe_alloc_failed(k->dsa->priv_key))
518: return SSH_ERR_ALLOC_FAIL;
519: break;
520: #undef bn_maybe_alloc_failed
521: case KEY_ECDSA:
522: case KEY_ECDSA_CERT:
523: /* Cannot do anything until we know the group */
524: break;
525: #endif /* WITH_OPENSSL */
526: case KEY_ED25519:
527: case KEY_ED25519_CERT:
528: /* no need to prealloc */
529: break;
530: case KEY_UNSPEC:
531: break;
532: default:
533: return SSH_ERR_INVALID_ARGUMENT;
534: }
535: return 0;
536: }
537:
538: struct sshkey *
539: sshkey_new_private(int type)
540: {
541: struct sshkey *k = sshkey_new(type);
542:
543: if (k == NULL)
544: return NULL;
545: if (sshkey_add_private(k) != 0) {
546: sshkey_free(k);
547: return NULL;
548: }
549: return k;
550: }
551:
552: void
553: sshkey_free(struct sshkey *k)
554: {
555: if (k == NULL)
556: return;
557: switch (k->type) {
558: #ifdef WITH_OPENSSL
559: case KEY_RSA:
560: case KEY_RSA_CERT:
561: if (k->rsa != NULL)
562: RSA_free(k->rsa);
563: k->rsa = NULL;
564: break;
565: case KEY_DSA:
566: case KEY_DSA_CERT:
567: if (k->dsa != NULL)
568: DSA_free(k->dsa);
569: k->dsa = NULL;
570: break;
571: case KEY_ECDSA:
572: case KEY_ECDSA_CERT:
573: if (k->ecdsa != NULL)
574: EC_KEY_free(k->ecdsa);
575: k->ecdsa = NULL;
576: break;
577: #endif /* WITH_OPENSSL */
578: case KEY_ED25519:
579: case KEY_ED25519_CERT:
580: if (k->ed25519_pk) {
581: explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
582: free(k->ed25519_pk);
583: k->ed25519_pk = NULL;
584: }
585: if (k->ed25519_sk) {
586: explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
587: free(k->ed25519_sk);
588: k->ed25519_sk = NULL;
589: }
590: break;
591: case KEY_UNSPEC:
592: break;
593: default:
594: break;
595: }
596: if (sshkey_is_cert(k))
597: cert_free(k->cert);
598: explicit_bzero(k, sizeof(*k));
599: free(k);
600: }
601:
602: static int
603: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
604: {
605: if (a == NULL && b == NULL)
606: return 1;
607: if (a == NULL || b == NULL)
608: return 0;
609: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
610: return 0;
611: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
612: sshbuf_len(a->certblob)) != 0)
613: return 0;
614: return 1;
615: }
616:
617: /*
618: * Compare public portions of key only, allowing comparisons between
619: * certificates and plain keys too.
620: */
621: int
622: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
623: {
624: #ifdef WITH_OPENSSL
625: BN_CTX *bnctx;
626: #endif /* WITH_OPENSSL */
627:
628: if (a == NULL || b == NULL ||
629: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
630: return 0;
631:
632: switch (a->type) {
633: #ifdef WITH_OPENSSL
634: case KEY_RSA_CERT:
635: case KEY_RSA:
636: return a->rsa != NULL && b->rsa != NULL &&
637: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
638: BN_cmp(a->rsa->n, b->rsa->n) == 0;
639: case KEY_DSA_CERT:
640: case KEY_DSA:
641: return a->dsa != NULL && b->dsa != NULL &&
642: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
643: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
644: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
645: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
646: case KEY_ECDSA_CERT:
647: case KEY_ECDSA:
648: if (a->ecdsa == NULL || b->ecdsa == NULL ||
649: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
650: EC_KEY_get0_public_key(b->ecdsa) == NULL)
651: return 0;
652: if ((bnctx = BN_CTX_new()) == NULL)
653: return 0;
654: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
655: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
656: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
657: EC_KEY_get0_public_key(a->ecdsa),
658: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
659: BN_CTX_free(bnctx);
660: return 0;
661: }
662: BN_CTX_free(bnctx);
663: return 1;
664: #endif /* WITH_OPENSSL */
665: case KEY_ED25519:
666: case KEY_ED25519_CERT:
667: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
668: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
669: default:
670: return 0;
671: }
672: /* NOTREACHED */
673: }
674:
675: int
676: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
677: {
678: if (a == NULL || b == NULL || a->type != b->type)
679: return 0;
680: if (sshkey_is_cert(a)) {
681: if (!cert_compare(a->cert, b->cert))
682: return 0;
683: }
684: return sshkey_equal_public(a, b);
685: }
686:
687: static int
688: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
689: {
690: int type, ret = SSH_ERR_INTERNAL_ERROR;
691: const char *typename;
692:
693: if (key == NULL)
694: return SSH_ERR_INVALID_ARGUMENT;
695:
1.19 djm 696: if (sshkey_is_cert(key)) {
697: if (key->cert == NULL)
698: return SSH_ERR_EXPECTED_CERT;
699: if (sshbuf_len(key->cert->certblob) == 0)
700: return SSH_ERR_KEY_LACKS_CERTBLOB;
701: }
1.1 djm 702: type = force_plain ? sshkey_type_plain(key->type) : key->type;
703: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
704:
705: switch (type) {
706: #ifdef WITH_OPENSSL
707: case KEY_DSA_CERT:
708: case KEY_ECDSA_CERT:
709: case KEY_RSA_CERT:
710: #endif /* WITH_OPENSSL */
711: case KEY_ED25519_CERT:
712: /* Use the existing blob */
713: /* XXX modified flag? */
714: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
715: return ret;
716: break;
717: #ifdef WITH_OPENSSL
718: case KEY_DSA:
719: if (key->dsa == NULL)
720: return SSH_ERR_INVALID_ARGUMENT;
721: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
722: (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
723: (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
724: (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
725: (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
726: return ret;
727: break;
728: case KEY_ECDSA:
729: if (key->ecdsa == NULL)
730: return SSH_ERR_INVALID_ARGUMENT;
731: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
732: (ret = sshbuf_put_cstring(b,
733: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
734: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
735: return ret;
736: break;
737: case KEY_RSA:
738: if (key->rsa == NULL)
739: return SSH_ERR_INVALID_ARGUMENT;
740: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
741: (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
742: (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
743: return ret;
744: break;
745: #endif /* WITH_OPENSSL */
746: case KEY_ED25519:
747: if (key->ed25519_pk == NULL)
748: return SSH_ERR_INVALID_ARGUMENT;
749: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
750: (ret = sshbuf_put_string(b,
751: key->ed25519_pk, ED25519_PK_SZ)) != 0)
752: return ret;
753: break;
754: default:
755: return SSH_ERR_KEY_TYPE_UNKNOWN;
756: }
757: return 0;
758: }
759:
760: int
1.14 djm 761: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 762: {
763: return to_blob_buf(key, b, 0);
764: }
765:
766: int
1.14 djm 767: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
768: {
769: struct sshbuf *tmp;
770: int r;
771:
772: if ((tmp = sshbuf_new()) == NULL)
773: return SSH_ERR_ALLOC_FAIL;
774: r = to_blob_buf(key, tmp, 0);
775: if (r == 0)
776: r = sshbuf_put_stringb(b, tmp);
777: sshbuf_free(tmp);
778: return r;
779: }
780:
781: int
782: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 783: {
784: return to_blob_buf(key, b, 1);
785: }
786:
787: static int
788: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
789: {
790: int ret = SSH_ERR_INTERNAL_ERROR;
791: size_t len;
792: struct sshbuf *b = NULL;
793:
794: if (lenp != NULL)
795: *lenp = 0;
796: if (blobp != NULL)
797: *blobp = NULL;
798: if ((b = sshbuf_new()) == NULL)
799: return SSH_ERR_ALLOC_FAIL;
800: if ((ret = to_blob_buf(key, b, force_plain)) != 0)
801: goto out;
802: len = sshbuf_len(b);
803: if (lenp != NULL)
804: *lenp = len;
805: if (blobp != NULL) {
806: if ((*blobp = malloc(len)) == NULL) {
807: ret = SSH_ERR_ALLOC_FAIL;
808: goto out;
809: }
810: memcpy(*blobp, sshbuf_ptr(b), len);
811: }
812: ret = 0;
813: out:
814: sshbuf_free(b);
815: return ret;
816: }
817:
818: int
819: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
820: {
821: return to_blob(key, blobp, lenp, 0);
822: }
823:
824: int
825: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
826: {
827: return to_blob(key, blobp, lenp, 1);
828: }
829:
830: int
1.7 djm 831: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 832: u_char **retp, size_t *lenp)
833: {
834: u_char *blob = NULL, *ret = NULL;
835: size_t blob_len = 0;
1.7 djm 836: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 837:
838: if (retp != NULL)
839: *retp = NULL;
840: if (lenp != NULL)
841: *lenp = 0;
1.7 djm 842: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 843: r = SSH_ERR_INVALID_ARGUMENT;
844: goto out;
845: }
1.48 djm 846: if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
1.1 djm 847: goto out;
848: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
849: r = SSH_ERR_ALLOC_FAIL;
850: goto out;
851: }
1.7 djm 852: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 853: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
854: goto out;
855: /* success */
856: if (retp != NULL) {
857: *retp = ret;
858: ret = NULL;
859: }
860: if (lenp != NULL)
1.7 djm 861: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 862: r = 0;
863: out:
864: free(ret);
865: if (blob != NULL) {
866: explicit_bzero(blob, blob_len);
867: free(blob);
868: }
869: return r;
870: }
871:
872: static char *
1.7 djm 873: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
874: {
875: char *ret;
876: size_t plen = strlen(alg) + 1;
877: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
878: int r;
879:
880: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
881: return NULL;
882: strlcpy(ret, alg, rlen);
883: strlcat(ret, ":", rlen);
884: if (dgst_raw_len == 0)
885: return ret;
886: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
887: ret + plen, rlen - plen)) == -1) {
888: explicit_bzero(ret, rlen);
889: free(ret);
890: return NULL;
891: }
892: /* Trim padding characters from end */
893: ret[strcspn(ret, "=")] = '\0';
894: return ret;
895: }
896:
897: static char *
898: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 899: {
1.7 djm 900: char *retval, hex[5];
901: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 902:
1.7 djm 903: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 904: return NULL;
1.7 djm 905: strlcpy(retval, alg, rlen);
906: strlcat(retval, ":", rlen);
1.1 djm 907: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 908: snprintf(hex, sizeof(hex), "%s%02x",
909: i > 0 ? ":" : "", dgst_raw[i]);
910: strlcat(retval, hex, rlen);
1.1 djm 911: }
912: return retval;
913: }
914:
915: static char *
916: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
917: {
918: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
919: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
920: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
921: u_int i, j = 0, rounds, seed = 1;
922: char *retval;
923:
924: rounds = (dgst_raw_len / 2) + 1;
925: if ((retval = calloc(rounds, 6)) == NULL)
926: return NULL;
927: retval[j++] = 'x';
928: for (i = 0; i < rounds; i++) {
929: u_int idx0, idx1, idx2, idx3, idx4;
930: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
931: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
932: seed) % 6;
933: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
934: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
935: (seed / 6)) % 6;
936: retval[j++] = vowels[idx0];
937: retval[j++] = consonants[idx1];
938: retval[j++] = vowels[idx2];
939: if ((i + 1) < rounds) {
940: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
941: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
942: retval[j++] = consonants[idx3];
943: retval[j++] = '-';
944: retval[j++] = consonants[idx4];
945: seed = ((seed * 5) +
946: ((((u_int)(dgst_raw[2 * i])) * 7) +
947: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
948: }
949: } else {
950: idx0 = seed % 6;
951: idx1 = 16;
952: idx2 = seed / 6;
953: retval[j++] = vowels[idx0];
954: retval[j++] = consonants[idx1];
955: retval[j++] = vowels[idx2];
956: }
957: }
958: retval[j++] = 'x';
959: retval[j++] = '\0';
960: return retval;
961: }
962:
963: /*
964: * Draw an ASCII-Art representing the fingerprint so human brain can
965: * profit from its built-in pattern recognition ability.
966: * This technique is called "random art" and can be found in some
967: * scientific publications like this original paper:
968: *
969: * "Hash Visualization: a New Technique to improve Real-World Security",
970: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
971: * Techniques and E-Commerce (CrypTEC '99)
972: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
973: *
974: * The subject came up in a talk by Dan Kaminsky, too.
975: *
976: * If you see the picture is different, the key is different.
977: * If the picture looks the same, you still know nothing.
978: *
979: * The algorithm used here is a worm crawling over a discrete plane,
980: * leaving a trace (augmenting the field) everywhere it goes.
981: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
982: * makes the respective movement vector be ignored for this turn.
983: * Graphs are not unambiguous, because circles in graphs can be
984: * walked in either direction.
985: */
986:
987: /*
988: * Field sizes for the random art. Have to be odd, so the starting point
989: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
990: * Else pictures would be too dense, and drawing the frame would
991: * fail, too, because the key type would not fit in anymore.
992: */
993: #define FLDBASE 8
994: #define FLDSIZE_Y (FLDBASE + 1)
995: #define FLDSIZE_X (FLDBASE * 2 + 1)
996: static char *
1.7 djm 997: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 998: const struct sshkey *k)
999: {
1000: /*
1001: * Chars to be used after each other every time the worm
1002: * intersects with itself. Matter of taste.
1003: */
1004: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1005: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1006: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1007: size_t i, tlen, hlen;
1.1 djm 1008: u_int b;
1.3 djm 1009: int x, y, r;
1.1 djm 1010: size_t len = strlen(augmentation_string) - 1;
1011:
1012: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1013: return NULL;
1014:
1015: /* initialize field */
1016: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1017: x = FLDSIZE_X / 2;
1018: y = FLDSIZE_Y / 2;
1019:
1020: /* process raw key */
1021: for (i = 0; i < dgst_raw_len; i++) {
1022: int input;
1023: /* each byte conveys four 2-bit move commands */
1024: input = dgst_raw[i];
1025: for (b = 0; b < 4; b++) {
1026: /* evaluate 2 bit, rest is shifted later */
1027: x += (input & 0x1) ? 1 : -1;
1028: y += (input & 0x2) ? 1 : -1;
1029:
1030: /* assure we are still in bounds */
1.37 deraadt 1031: x = MAXIMUM(x, 0);
1032: y = MAXIMUM(y, 0);
1033: x = MINIMUM(x, FLDSIZE_X - 1);
1034: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1035:
1036: /* augment the field */
1037: if (field[x][y] < len - 2)
1038: field[x][y]++;
1039: input = input >> 2;
1040: }
1041: }
1042:
1043: /* mark starting point and end point*/
1044: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1045: field[x][y] = len;
1046:
1.3 djm 1047: /* assemble title */
1048: r = snprintf(title, sizeof(title), "[%s %u]",
1049: sshkey_type(k), sshkey_size(k));
1050: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1051: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1052: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1053: tlen = (r <= 0) ? 0 : strlen(title);
1054:
1055: /* assemble hash ID. */
1056: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1057: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1058:
1059: /* output upper border */
1.3 djm 1060: p = retval;
1061: *p++ = '+';
1062: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1063: *p++ = '-';
1064: memcpy(p, title, tlen);
1065: p += tlen;
1.7 djm 1066: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1067: *p++ = '-';
1068: *p++ = '+';
1069: *p++ = '\n';
1070:
1071: /* output content */
1072: for (y = 0; y < FLDSIZE_Y; y++) {
1073: *p++ = '|';
1074: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1075: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1076: *p++ = '|';
1077: *p++ = '\n';
1078: }
1079:
1080: /* output lower border */
1081: *p++ = '+';
1.7 djm 1082: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1083: *p++ = '-';
1084: memcpy(p, hash, hlen);
1085: p += hlen;
1086: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1087: *p++ = '-';
1088: *p++ = '+';
1089:
1090: return retval;
1091: }
1092:
1093: char *
1.7 djm 1094: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1095: enum sshkey_fp_rep dgst_rep)
1096: {
1097: char *retval = NULL;
1098: u_char *dgst_raw;
1099: size_t dgst_raw_len;
1100:
1.7 djm 1101: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1102: return NULL;
1103: switch (dgst_rep) {
1.7 djm 1104: case SSH_FP_DEFAULT:
1105: if (dgst_alg == SSH_DIGEST_MD5) {
1106: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1107: dgst_raw, dgst_raw_len);
1108: } else {
1109: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1110: dgst_raw, dgst_raw_len);
1111: }
1112: break;
1.1 djm 1113: case SSH_FP_HEX:
1.7 djm 1114: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1115: dgst_raw, dgst_raw_len);
1116: break;
1117: case SSH_FP_BASE64:
1118: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1119: dgst_raw, dgst_raw_len);
1.1 djm 1120: break;
1121: case SSH_FP_BUBBLEBABBLE:
1122: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1123: break;
1124: case SSH_FP_RANDOMART:
1.7 djm 1125: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1126: dgst_raw, dgst_raw_len, k);
1.1 djm 1127: break;
1128: default:
1129: explicit_bzero(dgst_raw, dgst_raw_len);
1130: free(dgst_raw);
1131: return NULL;
1132: }
1133: explicit_bzero(dgst_raw, dgst_raw_len);
1134: free(dgst_raw);
1135: return retval;
1136: }
1137:
1138:
1139: /* returns 0 ok, and < 0 error */
1140: int
1141: sshkey_read(struct sshkey *ret, char **cpp)
1142: {
1143: struct sshkey *k;
1144: int retval = SSH_ERR_INVALID_FORMAT;
1.25 djm 1145: char *ep, *cp, *space;
1.1 djm 1146: int r, type, curve_nid = -1;
1147: struct sshbuf *blob;
1.44 dtucker 1148:
1149: if (ret == NULL)
1150: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1151:
1152: cp = *cpp;
1153:
1154: switch (ret->type) {
1155: case KEY_UNSPEC:
1156: case KEY_RSA:
1157: case KEY_DSA:
1158: case KEY_ECDSA:
1159: case KEY_ED25519:
1160: case KEY_DSA_CERT:
1161: case KEY_ECDSA_CERT:
1162: case KEY_RSA_CERT:
1163: case KEY_ED25519_CERT:
1164: space = strchr(cp, ' ');
1165: if (space == NULL)
1166: return SSH_ERR_INVALID_FORMAT;
1167: *space = '\0';
1168: type = sshkey_type_from_name(cp);
1169: if (sshkey_type_plain(type) == KEY_ECDSA &&
1170: (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1171: return SSH_ERR_EC_CURVE_INVALID;
1172: *space = ' ';
1173: if (type == KEY_UNSPEC)
1174: return SSH_ERR_INVALID_FORMAT;
1175: cp = space+1;
1176: if (*cp == '\0')
1177: return SSH_ERR_INVALID_FORMAT;
1.5 djm 1178: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1179: return SSH_ERR_KEY_TYPE_MISMATCH;
1180: if ((blob = sshbuf_new()) == NULL)
1181: return SSH_ERR_ALLOC_FAIL;
1182: /* trim comment */
1183: space = strchr(cp, ' ');
1.10 markus 1184: if (space) {
1185: /* advance 'space': skip whitespace */
1186: *space++ = '\0';
1187: while (*space == ' ' || *space == '\t')
1188: space++;
1.25 djm 1189: ep = space;
1.10 markus 1190: } else
1.25 djm 1191: ep = cp + strlen(cp);
1.1 djm 1192: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1193: sshbuf_free(blob);
1194: return r;
1195: }
1196: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1197: sshbuf_len(blob), &k)) != 0) {
1198: sshbuf_free(blob);
1199: return r;
1200: }
1201: sshbuf_free(blob);
1202: if (k->type != type) {
1203: sshkey_free(k);
1204: return SSH_ERR_KEY_TYPE_MISMATCH;
1205: }
1206: if (sshkey_type_plain(type) == KEY_ECDSA &&
1207: curve_nid != k->ecdsa_nid) {
1208: sshkey_free(k);
1209: return SSH_ERR_EC_CURVE_MISMATCH;
1210: }
1.5 djm 1211: ret->type = type;
1.1 djm 1212: if (sshkey_is_cert(ret)) {
1213: if (!sshkey_is_cert(k)) {
1214: sshkey_free(k);
1215: return SSH_ERR_EXPECTED_CERT;
1216: }
1217: if (ret->cert != NULL)
1218: cert_free(ret->cert);
1219: ret->cert = k->cert;
1220: k->cert = NULL;
1221: }
1.25 djm 1222: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1223: #ifdef WITH_OPENSSL
1.25 djm 1224: case KEY_RSA:
1.1 djm 1225: if (ret->rsa != NULL)
1226: RSA_free(ret->rsa);
1227: ret->rsa = k->rsa;
1228: k->rsa = NULL;
1229: #ifdef DEBUG_PK
1230: RSA_print_fp(stderr, ret->rsa, 8);
1231: #endif
1.25 djm 1232: break;
1233: case KEY_DSA:
1.1 djm 1234: if (ret->dsa != NULL)
1235: DSA_free(ret->dsa);
1236: ret->dsa = k->dsa;
1237: k->dsa = NULL;
1238: #ifdef DEBUG_PK
1239: DSA_print_fp(stderr, ret->dsa, 8);
1240: #endif
1.25 djm 1241: break;
1242: case KEY_ECDSA:
1.1 djm 1243: if (ret->ecdsa != NULL)
1244: EC_KEY_free(ret->ecdsa);
1245: ret->ecdsa = k->ecdsa;
1246: ret->ecdsa_nid = k->ecdsa_nid;
1247: k->ecdsa = NULL;
1248: k->ecdsa_nid = -1;
1249: #ifdef DEBUG_PK
1250: sshkey_dump_ec_key(ret->ecdsa);
1251: #endif
1.25 djm 1252: break;
1.1 djm 1253: #endif /* WITH_OPENSSL */
1.25 djm 1254: case KEY_ED25519:
1.1 djm 1255: free(ret->ed25519_pk);
1256: ret->ed25519_pk = k->ed25519_pk;
1257: k->ed25519_pk = NULL;
1258: #ifdef DEBUG_PK
1259: /* XXX */
1260: #endif
1.25 djm 1261: break;
1.1 djm 1262: }
1.25 djm 1263: *cpp = ep;
1.1 djm 1264: retval = 0;
1265: /*XXXX*/
1266: sshkey_free(k);
1267: if (retval != 0)
1268: break;
1269: break;
1270: default:
1271: return SSH_ERR_INVALID_ARGUMENT;
1272: }
1273: return retval;
1274: }
1275:
1276: int
1.19 djm 1277: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1278: {
1.19 djm 1279: int r = SSH_ERR_INTERNAL_ERROR;
1280: struct sshbuf *b = NULL;
1.1 djm 1281: char *uu = NULL;
1.19 djm 1282:
1283: if (b64p != NULL)
1284: *b64p = NULL;
1285: if ((b = sshbuf_new()) == NULL)
1286: return SSH_ERR_ALLOC_FAIL;
1287: if ((r = sshkey_putb(key, b)) != 0)
1288: goto out;
1289: if ((uu = sshbuf_dtob64(b)) == NULL) {
1290: r = SSH_ERR_ALLOC_FAIL;
1291: goto out;
1292: }
1293: /* Success */
1294: if (b64p != NULL) {
1295: *b64p = uu;
1296: uu = NULL;
1297: }
1298: r = 0;
1299: out:
1300: sshbuf_free(b);
1301: free(uu);
1302: return r;
1303: }
1304:
1.52 djm 1305: int
1.19 djm 1306: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1307: {
1308: int r = SSH_ERR_INTERNAL_ERROR;
1309: char *uu = NULL;
1310:
1.48 djm 1311: if ((r = sshkey_to_base64(key, &uu)) != 0)
1312: goto out;
1313: if ((r = sshbuf_putf(b, "%s %s",
1314: sshkey_ssh_name(key), uu)) != 0)
1315: goto out;
1.19 djm 1316: r = 0;
1317: out:
1318: free(uu);
1319: return r;
1320: }
1321:
1322: int
1323: sshkey_write(const struct sshkey *key, FILE *f)
1324: {
1325: struct sshbuf *b = NULL;
1326: int r = SSH_ERR_INTERNAL_ERROR;
1327:
1328: if ((b = sshbuf_new()) == NULL)
1329: return SSH_ERR_ALLOC_FAIL;
1330: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1331: goto out;
1332: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1333: if (feof(f))
1334: errno = EPIPE;
1.19 djm 1335: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1336: goto out;
1337: }
1.19 djm 1338: /* Success */
1339: r = 0;
1.1 djm 1340: out:
1.19 djm 1341: sshbuf_free(b);
1342: return r;
1.1 djm 1343: }
1344:
1345: const char *
1346: sshkey_cert_type(const struct sshkey *k)
1347: {
1348: switch (k->cert->type) {
1349: case SSH2_CERT_TYPE_USER:
1350: return "user";
1351: case SSH2_CERT_TYPE_HOST:
1352: return "host";
1353: default:
1354: return "unknown";
1355: }
1356: }
1357:
1358: #ifdef WITH_OPENSSL
1359: static int
1360: rsa_generate_private_key(u_int bits, RSA **rsap)
1361: {
1362: RSA *private = NULL;
1363: BIGNUM *f4 = NULL;
1364: int ret = SSH_ERR_INTERNAL_ERROR;
1365:
1.49 djm 1366: if (rsap == NULL)
1367: return SSH_ERR_INVALID_ARGUMENT;
1368: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1369: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1370: return SSH_ERR_KEY_LENGTH;
1.1 djm 1371: *rsap = NULL;
1372: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1373: ret = SSH_ERR_ALLOC_FAIL;
1374: goto out;
1375: }
1376: if (!BN_set_word(f4, RSA_F4) ||
1377: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1378: ret = SSH_ERR_LIBCRYPTO_ERROR;
1379: goto out;
1380: }
1381: *rsap = private;
1382: private = NULL;
1383: ret = 0;
1384: out:
1385: if (private != NULL)
1386: RSA_free(private);
1387: if (f4 != NULL)
1388: BN_free(f4);
1389: return ret;
1390: }
1391:
1392: static int
1393: dsa_generate_private_key(u_int bits, DSA **dsap)
1394: {
1395: DSA *private;
1396: int ret = SSH_ERR_INTERNAL_ERROR;
1397:
1.49 djm 1398: if (dsap == NULL)
1.1 djm 1399: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1400: if (bits != 1024)
1401: return SSH_ERR_KEY_LENGTH;
1.1 djm 1402: if ((private = DSA_new()) == NULL) {
1403: ret = SSH_ERR_ALLOC_FAIL;
1404: goto out;
1405: }
1406: *dsap = NULL;
1407: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1408: NULL, NULL) || !DSA_generate_key(private)) {
1409: ret = SSH_ERR_LIBCRYPTO_ERROR;
1410: goto out;
1411: }
1412: *dsap = private;
1413: private = NULL;
1414: ret = 0;
1415: out:
1416: if (private != NULL)
1417: DSA_free(private);
1418: return ret;
1419: }
1420:
1421: int
1422: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1423: {
1424: EC_GROUP *eg;
1425: int nids[] = {
1426: NID_X9_62_prime256v1,
1427: NID_secp384r1,
1428: NID_secp521r1,
1429: -1
1430: };
1431: int nid;
1432: u_int i;
1433: BN_CTX *bnctx;
1434: const EC_GROUP *g = EC_KEY_get0_group(k);
1435:
1436: /*
1437: * The group may be stored in a ASN.1 encoded private key in one of two
1438: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1439: * or explicit group parameters encoded into the key blob. Only the
1440: * "named group" case sets the group NID for us, but we can figure
1441: * it out for the other case by comparing against all the groups that
1442: * are supported.
1443: */
1444: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1445: return nid;
1446: if ((bnctx = BN_CTX_new()) == NULL)
1447: return -1;
1448: for (i = 0; nids[i] != -1; i++) {
1449: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1450: BN_CTX_free(bnctx);
1451: return -1;
1452: }
1453: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1454: break;
1455: EC_GROUP_free(eg);
1456: }
1457: BN_CTX_free(bnctx);
1458: if (nids[i] != -1) {
1459: /* Use the group with the NID attached */
1460: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1461: if (EC_KEY_set_group(k, eg) != 1) {
1462: EC_GROUP_free(eg);
1463: return -1;
1464: }
1465: }
1466: return nids[i];
1467: }
1468:
1469: static int
1470: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1471: {
1472: EC_KEY *private;
1473: int ret = SSH_ERR_INTERNAL_ERROR;
1474:
1.50 djm 1475: if (nid == NULL || ecdsap == NULL)
1.1 djm 1476: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1477: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1478: return SSH_ERR_KEY_LENGTH;
1.1 djm 1479: *ecdsap = NULL;
1480: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1481: ret = SSH_ERR_ALLOC_FAIL;
1482: goto out;
1483: }
1484: if (EC_KEY_generate_key(private) != 1) {
1485: ret = SSH_ERR_LIBCRYPTO_ERROR;
1486: goto out;
1487: }
1488: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1489: *ecdsap = private;
1490: private = NULL;
1491: ret = 0;
1492: out:
1493: if (private != NULL)
1494: EC_KEY_free(private);
1495: return ret;
1496: }
1497: #endif /* WITH_OPENSSL */
1498:
1499: int
1500: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1501: {
1502: struct sshkey *k;
1503: int ret = SSH_ERR_INTERNAL_ERROR;
1504:
1505: if (keyp == NULL)
1506: return SSH_ERR_INVALID_ARGUMENT;
1507: *keyp = NULL;
1508: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1509: return SSH_ERR_ALLOC_FAIL;
1510: switch (type) {
1511: case KEY_ED25519:
1512: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1513: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1514: ret = SSH_ERR_ALLOC_FAIL;
1515: break;
1516: }
1517: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1518: ret = 0;
1519: break;
1520: #ifdef WITH_OPENSSL
1521: case KEY_DSA:
1522: ret = dsa_generate_private_key(bits, &k->dsa);
1523: break;
1524: case KEY_ECDSA:
1525: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1526: &k->ecdsa);
1527: break;
1528: case KEY_RSA:
1529: ret = rsa_generate_private_key(bits, &k->rsa);
1530: break;
1531: #endif /* WITH_OPENSSL */
1532: default:
1533: ret = SSH_ERR_INVALID_ARGUMENT;
1534: }
1535: if (ret == 0) {
1536: k->type = type;
1537: *keyp = k;
1538: } else
1539: sshkey_free(k);
1540: return ret;
1541: }
1542:
1543: int
1544: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1545: {
1546: u_int i;
1547: const struct sshkey_cert *from;
1548: struct sshkey_cert *to;
1549: int ret = SSH_ERR_INTERNAL_ERROR;
1550:
1551: if (to_key->cert != NULL) {
1552: cert_free(to_key->cert);
1553: to_key->cert = NULL;
1554: }
1555:
1556: if ((from = from_key->cert) == NULL)
1557: return SSH_ERR_INVALID_ARGUMENT;
1558:
1559: if ((to = to_key->cert = cert_new()) == NULL)
1560: return SSH_ERR_ALLOC_FAIL;
1561:
1562: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1563: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1.22 jsg 1564: (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1.1 djm 1565: return ret;
1566:
1567: to->serial = from->serial;
1568: to->type = from->type;
1569: if (from->key_id == NULL)
1570: to->key_id = NULL;
1571: else if ((to->key_id = strdup(from->key_id)) == NULL)
1572: return SSH_ERR_ALLOC_FAIL;
1573: to->valid_after = from->valid_after;
1574: to->valid_before = from->valid_before;
1575: if (from->signature_key == NULL)
1576: to->signature_key = NULL;
1577: else if ((ret = sshkey_from_private(from->signature_key,
1578: &to->signature_key)) != 0)
1579: return ret;
1580:
1581: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1582: return SSH_ERR_INVALID_ARGUMENT;
1583: if (from->nprincipals > 0) {
1584: if ((to->principals = calloc(from->nprincipals,
1585: sizeof(*to->principals))) == NULL)
1586: return SSH_ERR_ALLOC_FAIL;
1587: for (i = 0; i < from->nprincipals; i++) {
1588: to->principals[i] = strdup(from->principals[i]);
1589: if (to->principals[i] == NULL) {
1590: to->nprincipals = i;
1591: return SSH_ERR_ALLOC_FAIL;
1592: }
1593: }
1594: }
1595: to->nprincipals = from->nprincipals;
1596: return 0;
1597: }
1598:
1599: int
1600: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1601: {
1602: struct sshkey *n = NULL;
1603: int ret = SSH_ERR_INTERNAL_ERROR;
1604:
1.24 djm 1605: *pkp = NULL;
1.1 djm 1606: switch (k->type) {
1607: #ifdef WITH_OPENSSL
1608: case KEY_DSA:
1609: case KEY_DSA_CERT:
1610: if ((n = sshkey_new(k->type)) == NULL)
1611: return SSH_ERR_ALLOC_FAIL;
1612: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1613: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1614: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1615: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1616: sshkey_free(n);
1617: return SSH_ERR_ALLOC_FAIL;
1618: }
1619: break;
1620: case KEY_ECDSA:
1621: case KEY_ECDSA_CERT:
1622: if ((n = sshkey_new(k->type)) == NULL)
1623: return SSH_ERR_ALLOC_FAIL;
1624: n->ecdsa_nid = k->ecdsa_nid;
1625: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1626: if (n->ecdsa == NULL) {
1627: sshkey_free(n);
1628: return SSH_ERR_ALLOC_FAIL;
1629: }
1630: if (EC_KEY_set_public_key(n->ecdsa,
1631: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1632: sshkey_free(n);
1633: return SSH_ERR_LIBCRYPTO_ERROR;
1634: }
1635: break;
1636: case KEY_RSA:
1637: case KEY_RSA_CERT:
1638: if ((n = sshkey_new(k->type)) == NULL)
1639: return SSH_ERR_ALLOC_FAIL;
1640: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1641: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1642: sshkey_free(n);
1643: return SSH_ERR_ALLOC_FAIL;
1644: }
1645: break;
1646: #endif /* WITH_OPENSSL */
1647: case KEY_ED25519:
1648: case KEY_ED25519_CERT:
1649: if ((n = sshkey_new(k->type)) == NULL)
1650: return SSH_ERR_ALLOC_FAIL;
1651: if (k->ed25519_pk != NULL) {
1652: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1653: sshkey_free(n);
1654: return SSH_ERR_ALLOC_FAIL;
1655: }
1656: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1657: }
1658: break;
1659: default:
1660: return SSH_ERR_KEY_TYPE_UNKNOWN;
1661: }
1662: if (sshkey_is_cert(k)) {
1663: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1664: sshkey_free(n);
1665: return ret;
1666: }
1667: }
1668: *pkp = n;
1669: return 0;
1670: }
1671:
1672: static int
1.14 djm 1673: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1674: {
1.14 djm 1675: struct sshbuf *principals = NULL, *crit = NULL;
1676: struct sshbuf *exts = NULL, *ca = NULL;
1677: u_char *sig = NULL;
1678: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1679: int ret = SSH_ERR_INTERNAL_ERROR;
1680:
1681: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1682: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1683: return ret;
1684:
1.20 djm 1685: /* Parse body of certificate up to signature */
1686: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1687: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1688: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1689: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1690: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1691: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1692: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1693: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1694: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1695: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1696: /* XXX debug print error for ret */
1697: ret = SSH_ERR_INVALID_FORMAT;
1698: goto out;
1699: }
1700:
1701: /* Signature is left in the buffer so we can calculate this length */
1702: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1703:
1704: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1705: ret = SSH_ERR_INVALID_FORMAT;
1706: goto out;
1707: }
1708:
1709: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1710: key->cert->type != SSH2_CERT_TYPE_HOST) {
1711: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1712: goto out;
1713: }
1714:
1.4 djm 1715: /* Parse principals section */
1716: while (sshbuf_len(principals) > 0) {
1717: char *principal = NULL;
1718: char **oprincipals = NULL;
1719:
1.1 djm 1720: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1721: ret = SSH_ERR_INVALID_FORMAT;
1722: goto out;
1723: }
1.4 djm 1724: if ((ret = sshbuf_get_cstring(principals, &principal,
1725: NULL)) != 0) {
1.1 djm 1726: ret = SSH_ERR_INVALID_FORMAT;
1727: goto out;
1728: }
1729: oprincipals = key->cert->principals;
1.51 deraadt 1730: key->cert->principals = recallocarray(key->cert->principals,
1731: key->cert->nprincipals, key->cert->nprincipals + 1,
1732: sizeof(*key->cert->principals));
1.1 djm 1733: if (key->cert->principals == NULL) {
1734: free(principal);
1735: key->cert->principals = oprincipals;
1736: ret = SSH_ERR_ALLOC_FAIL;
1737: goto out;
1738: }
1739: key->cert->principals[key->cert->nprincipals++] = principal;
1740: }
1741:
1.4 djm 1742: /*
1743: * Stash a copies of the critical options and extensions sections
1744: * for later use.
1745: */
1746: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1747: (exts != NULL &&
1748: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1749: goto out;
1750:
1.4 djm 1751: /*
1752: * Validate critical options and extensions sections format.
1753: */
1754: while (sshbuf_len(crit) != 0) {
1755: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1756: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1757: sshbuf_reset(key->cert->critical);
1.1 djm 1758: ret = SSH_ERR_INVALID_FORMAT;
1759: goto out;
1760: }
1761: }
1.4 djm 1762: while (exts != NULL && sshbuf_len(exts) != 0) {
1763: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1764: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1765: sshbuf_reset(key->cert->extensions);
1.1 djm 1766: ret = SSH_ERR_INVALID_FORMAT;
1767: goto out;
1768: }
1769: }
1770:
1.4 djm 1771: /* Parse CA key and check signature */
1.14 djm 1772: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1773: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1774: goto out;
1775: }
1776: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1777: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1778: goto out;
1779: }
1780: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1781: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1782: goto out;
1.4 djm 1783:
1784: /* Success */
1.1 djm 1785: ret = 0;
1786: out:
1.14 djm 1787: sshbuf_free(ca);
1.4 djm 1788: sshbuf_free(crit);
1789: sshbuf_free(exts);
1790: sshbuf_free(principals);
1.1 djm 1791: free(sig);
1792: return ret;
1793: }
1794:
1795: static int
1.14 djm 1796: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1797: int allow_cert)
1.1 djm 1798: {
1.12 djm 1799: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1800: char *ktype = NULL, *curve = NULL;
1801: struct sshkey *key = NULL;
1802: size_t len;
1803: u_char *pk = NULL;
1.14 djm 1804: struct sshbuf *copy;
1.1 djm 1805: #ifdef WITH_OPENSSL
1806: EC_POINT *q = NULL;
1807: #endif /* WITH_OPENSSL */
1808:
1809: #ifdef DEBUG_PK /* XXX */
1.14 djm 1810: sshbuf_dump(b, stderr);
1.1 djm 1811: #endif
1.32 djm 1812: if (keyp != NULL)
1813: *keyp = NULL;
1.14 djm 1814: if ((copy = sshbuf_fromb(b)) == NULL) {
1815: ret = SSH_ERR_ALLOC_FAIL;
1816: goto out;
1817: }
1.1 djm 1818: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1819: ret = SSH_ERR_INVALID_FORMAT;
1820: goto out;
1821: }
1822:
1823: type = sshkey_type_from_name(ktype);
1824: if (!allow_cert && sshkey_type_is_cert(type)) {
1825: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1826: goto out;
1827: }
1828: switch (type) {
1829: #ifdef WITH_OPENSSL
1830: case KEY_RSA_CERT:
1.14 djm 1831: /* Skip nonce */
1.1 djm 1832: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1833: ret = SSH_ERR_INVALID_FORMAT;
1834: goto out;
1835: }
1836: /* FALLTHROUGH */
1837: case KEY_RSA:
1838: if ((key = sshkey_new(type)) == NULL) {
1839: ret = SSH_ERR_ALLOC_FAIL;
1840: goto out;
1841: }
1.16 djm 1842: if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
1843: sshbuf_get_bignum2(b, key->rsa->n) != 0) {
1.1 djm 1844: ret = SSH_ERR_INVALID_FORMAT;
1845: goto out;
1846: }
1.49 djm 1847: if (BN_num_bits(key->rsa->n) < SSH_RSA_MINIMUM_MODULUS_SIZE) {
1848: ret = SSH_ERR_KEY_LENGTH;
1849: goto out;
1850: }
1.1 djm 1851: #ifdef DEBUG_PK
1852: RSA_print_fp(stderr, key->rsa, 8);
1853: #endif
1854: break;
1855: case KEY_DSA_CERT:
1.14 djm 1856: /* Skip nonce */
1.1 djm 1857: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1858: ret = SSH_ERR_INVALID_FORMAT;
1859: goto out;
1860: }
1861: /* FALLTHROUGH */
1862: case KEY_DSA:
1863: if ((key = sshkey_new(type)) == NULL) {
1864: ret = SSH_ERR_ALLOC_FAIL;
1865: goto out;
1866: }
1.16 djm 1867: if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
1868: sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
1869: sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
1870: sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
1.1 djm 1871: ret = SSH_ERR_INVALID_FORMAT;
1872: goto out;
1873: }
1874: #ifdef DEBUG_PK
1875: DSA_print_fp(stderr, key->dsa, 8);
1876: #endif
1877: break;
1878: case KEY_ECDSA_CERT:
1.14 djm 1879: /* Skip nonce */
1.1 djm 1880: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1881: ret = SSH_ERR_INVALID_FORMAT;
1882: goto out;
1883: }
1884: /* FALLTHROUGH */
1885: case KEY_ECDSA:
1886: if ((key = sshkey_new(type)) == NULL) {
1887: ret = SSH_ERR_ALLOC_FAIL;
1888: goto out;
1889: }
1.12 djm 1890: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 1891: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1892: ret = SSH_ERR_INVALID_FORMAT;
1893: goto out;
1894: }
1895: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1896: ret = SSH_ERR_EC_CURVE_MISMATCH;
1897: goto out;
1898: }
1899: if (key->ecdsa != NULL)
1900: EC_KEY_free(key->ecdsa);
1901: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1902: == NULL) {
1903: ret = SSH_ERR_EC_CURVE_INVALID;
1904: goto out;
1905: }
1906: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
1907: ret = SSH_ERR_ALLOC_FAIL;
1908: goto out;
1909: }
1910: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
1911: ret = SSH_ERR_INVALID_FORMAT;
1912: goto out;
1913: }
1914: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1915: q) != 0) {
1916: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1917: goto out;
1918: }
1919: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
1920: /* XXX assume it is a allocation error */
1921: ret = SSH_ERR_ALLOC_FAIL;
1922: goto out;
1923: }
1924: #ifdef DEBUG_PK
1925: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1926: #endif
1927: break;
1928: #endif /* WITH_OPENSSL */
1929: case KEY_ED25519_CERT:
1.14 djm 1930: /* Skip nonce */
1.1 djm 1931: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1932: ret = SSH_ERR_INVALID_FORMAT;
1933: goto out;
1934: }
1935: /* FALLTHROUGH */
1936: case KEY_ED25519:
1937: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
1938: goto out;
1939: if (len != ED25519_PK_SZ) {
1940: ret = SSH_ERR_INVALID_FORMAT;
1941: goto out;
1942: }
1943: if ((key = sshkey_new(type)) == NULL) {
1944: ret = SSH_ERR_ALLOC_FAIL;
1945: goto out;
1946: }
1947: key->ed25519_pk = pk;
1948: pk = NULL;
1949: break;
1950: case KEY_UNSPEC:
1951: default:
1952: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1953: goto out;
1954: }
1955:
1956: /* Parse certificate potion */
1.14 djm 1957: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 1958: goto out;
1959:
1960: if (key != NULL && sshbuf_len(b) != 0) {
1961: ret = SSH_ERR_INVALID_FORMAT;
1962: goto out;
1963: }
1964: ret = 0;
1.32 djm 1965: if (keyp != NULL) {
1966: *keyp = key;
1967: key = NULL;
1968: }
1.1 djm 1969: out:
1.14 djm 1970: sshbuf_free(copy);
1.1 djm 1971: sshkey_free(key);
1972: free(ktype);
1973: free(curve);
1974: free(pk);
1975: #ifdef WITH_OPENSSL
1976: if (q != NULL)
1977: EC_POINT_free(q);
1978: #endif /* WITH_OPENSSL */
1979: return ret;
1980: }
1981:
1982: int
1983: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
1984: {
1.14 djm 1985: struct sshbuf *b;
1986: int r;
1987:
1988: if ((b = sshbuf_from(blob, blen)) == NULL)
1989: return SSH_ERR_ALLOC_FAIL;
1990: r = sshkey_from_blob_internal(b, keyp, 1);
1991: sshbuf_free(b);
1992: return r;
1993: }
1994:
1995: int
1996: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
1997: {
1998: return sshkey_from_blob_internal(b, keyp, 1);
1999: }
2000:
2001: int
2002: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2003: {
2004: struct sshbuf *b;
2005: int r;
2006:
2007: if ((r = sshbuf_froms(buf, &b)) != 0)
2008: return r;
2009: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 ! djm 2010: sshbuf_free(b);
! 2011: return r;
! 2012: }
! 2013:
! 2014: int
! 2015: sshkey_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
! 2016: {
! 2017: int r;
! 2018: struct sshbuf *b = NULL;
! 2019: char *sigtype = NULL;
! 2020:
! 2021: if (sigtypep != NULL)
! 2022: *sigtypep = NULL;
! 2023: if ((b = sshbuf_from(sig, siglen)) == NULL)
! 2024: return SSH_ERR_ALLOC_FAIL;
! 2025: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
! 2026: goto out;
! 2027: /* success */
! 2028: if (sigtypep != NULL) {
! 2029: *sigtypep = sigtype;
! 2030: sigtype = NULL;
! 2031: }
! 2032: r = 0;
! 2033: out:
! 2034: free(sigtype);
1.14 djm 2035: sshbuf_free(b);
2036: return r;
1.1 djm 2037: }
2038:
2039: int
2040: sshkey_sign(const struct sshkey *key,
2041: u_char **sigp, size_t *lenp,
1.28 markus 2042: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2043: {
2044: if (sigp != NULL)
2045: *sigp = NULL;
2046: if (lenp != NULL)
2047: *lenp = 0;
2048: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2049: return SSH_ERR_INVALID_ARGUMENT;
2050: switch (key->type) {
2051: #ifdef WITH_OPENSSL
2052: case KEY_DSA_CERT:
2053: case KEY_DSA:
2054: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2055: case KEY_ECDSA_CERT:
2056: case KEY_ECDSA:
2057: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2058: case KEY_RSA_CERT:
2059: case KEY_RSA:
1.28 markus 2060: return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
1.1 djm 2061: #endif /* WITH_OPENSSL */
2062: case KEY_ED25519:
2063: case KEY_ED25519_CERT:
2064: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2065: default:
2066: return SSH_ERR_KEY_TYPE_UNKNOWN;
2067: }
2068: }
2069:
2070: /*
2071: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2072: */
2073: int
2074: sshkey_verify(const struct sshkey *key,
2075: const u_char *sig, size_t siglen,
2076: const u_char *data, size_t dlen, u_int compat)
2077: {
1.6 djm 2078: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2079: return SSH_ERR_INVALID_ARGUMENT;
2080: switch (key->type) {
2081: #ifdef WITH_OPENSSL
2082: case KEY_DSA_CERT:
2083: case KEY_DSA:
2084: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2085: case KEY_ECDSA_CERT:
2086: case KEY_ECDSA:
2087: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2088: case KEY_RSA_CERT:
2089: case KEY_RSA:
1.28 markus 2090: return ssh_rsa_verify(key, sig, siglen, data, dlen);
1.1 djm 2091: #endif /* WITH_OPENSSL */
2092: case KEY_ED25519:
2093: case KEY_ED25519_CERT:
2094: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2095: default:
2096: return SSH_ERR_KEY_TYPE_UNKNOWN;
2097: }
2098: }
2099:
2100: /* Converts a private to a public key */
2101: int
2102: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2103: {
2104: struct sshkey *pk;
2105: int ret = SSH_ERR_INTERNAL_ERROR;
2106:
1.24 djm 2107: *dkp = NULL;
1.1 djm 2108: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2109: return SSH_ERR_ALLOC_FAIL;
2110: pk->type = k->type;
2111: pk->flags = k->flags;
2112: pk->ecdsa_nid = k->ecdsa_nid;
2113: pk->dsa = NULL;
2114: pk->ecdsa = NULL;
2115: pk->rsa = NULL;
2116: pk->ed25519_pk = NULL;
2117: pk->ed25519_sk = NULL;
2118:
2119: switch (k->type) {
2120: #ifdef WITH_OPENSSL
2121: case KEY_RSA_CERT:
2122: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2123: goto fail;
2124: /* FALLTHROUGH */
2125: case KEY_RSA:
2126: if ((pk->rsa = RSA_new()) == NULL ||
2127: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2128: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2129: ret = SSH_ERR_ALLOC_FAIL;
2130: goto fail;
2131: }
2132: break;
2133: case KEY_DSA_CERT:
2134: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2135: goto fail;
2136: /* FALLTHROUGH */
2137: case KEY_DSA:
2138: if ((pk->dsa = DSA_new()) == NULL ||
2139: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2140: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2141: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2142: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2143: ret = SSH_ERR_ALLOC_FAIL;
2144: goto fail;
2145: }
2146: break;
2147: case KEY_ECDSA_CERT:
2148: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2149: goto fail;
2150: /* FALLTHROUGH */
2151: case KEY_ECDSA:
2152: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2153: if (pk->ecdsa == NULL) {
2154: ret = SSH_ERR_ALLOC_FAIL;
2155: goto fail;
2156: }
2157: if (EC_KEY_set_public_key(pk->ecdsa,
2158: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2159: ret = SSH_ERR_LIBCRYPTO_ERROR;
2160: goto fail;
2161: }
2162: break;
2163: #endif /* WITH_OPENSSL */
2164: case KEY_ED25519_CERT:
2165: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2166: goto fail;
2167: /* FALLTHROUGH */
2168: case KEY_ED25519:
2169: if (k->ed25519_pk != NULL) {
2170: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2171: ret = SSH_ERR_ALLOC_FAIL;
2172: goto fail;
2173: }
2174: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2175: }
2176: break;
2177: default:
2178: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2179: fail:
2180: sshkey_free(pk);
2181: return ret;
2182: }
2183: *dkp = pk;
2184: return 0;
2185: }
2186:
2187: /* Convert a plain key to their _CERT equivalent */
2188: int
1.20 djm 2189: sshkey_to_certified(struct sshkey *k)
1.1 djm 2190: {
2191: int newtype;
2192:
2193: switch (k->type) {
2194: #ifdef WITH_OPENSSL
2195: case KEY_RSA:
1.20 djm 2196: newtype = KEY_RSA_CERT;
1.1 djm 2197: break;
2198: case KEY_DSA:
1.20 djm 2199: newtype = KEY_DSA_CERT;
1.1 djm 2200: break;
2201: case KEY_ECDSA:
2202: newtype = KEY_ECDSA_CERT;
2203: break;
2204: #endif /* WITH_OPENSSL */
2205: case KEY_ED25519:
2206: newtype = KEY_ED25519_CERT;
2207: break;
2208: default:
2209: return SSH_ERR_INVALID_ARGUMENT;
2210: }
2211: if ((k->cert = cert_new()) == NULL)
2212: return SSH_ERR_ALLOC_FAIL;
2213: k->type = newtype;
2214: return 0;
2215: }
2216:
2217: /* Convert a certificate to its raw key equivalent */
2218: int
2219: sshkey_drop_cert(struct sshkey *k)
2220: {
2221: if (!sshkey_type_is_cert(k->type))
2222: return SSH_ERR_KEY_TYPE_UNKNOWN;
2223: cert_free(k->cert);
2224: k->cert = NULL;
2225: k->type = sshkey_type_plain(k->type);
2226: return 0;
2227: }
2228:
2229: /* Sign a certified key, (re-)generating the signed certblob. */
2230: int
1.53 djm 2231: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2232: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2233: {
2234: struct sshbuf *principals = NULL;
2235: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2236: size_t i, ca_len, sig_len;
2237: int ret = SSH_ERR_INTERNAL_ERROR;
2238: struct sshbuf *cert;
2239:
2240: if (k == NULL || k->cert == NULL ||
2241: k->cert->certblob == NULL || ca == NULL)
2242: return SSH_ERR_INVALID_ARGUMENT;
2243: if (!sshkey_is_cert(k))
2244: return SSH_ERR_KEY_TYPE_UNKNOWN;
2245: if (!sshkey_type_is_valid_ca(ca->type))
2246: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2247:
2248: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2249: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2250:
2251: cert = k->cert->certblob; /* for readability */
2252: sshbuf_reset(cert);
2253: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2254: goto out;
2255:
2256: /* -v01 certs put nonce first */
2257: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2258: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2259: goto out;
1.1 djm 2260:
2261: /* XXX this substantially duplicates to_blob(); refactor */
2262: switch (k->type) {
2263: #ifdef WITH_OPENSSL
2264: case KEY_DSA_CERT:
2265: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2266: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2267: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2268: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2269: goto out;
2270: break;
2271: case KEY_ECDSA_CERT:
2272: if ((ret = sshbuf_put_cstring(cert,
2273: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2274: (ret = sshbuf_put_ec(cert,
2275: EC_KEY_get0_public_key(k->ecdsa),
2276: EC_KEY_get0_group(k->ecdsa))) != 0)
2277: goto out;
2278: break;
2279: case KEY_RSA_CERT:
2280: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2281: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2282: goto out;
2283: break;
2284: #endif /* WITH_OPENSSL */
2285: case KEY_ED25519_CERT:
2286: if ((ret = sshbuf_put_string(cert,
2287: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2288: goto out;
2289: break;
2290: default:
2291: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2292: goto out;
1.1 djm 2293: }
2294:
1.20 djm 2295: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2296: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2297: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2298: goto out;
2299:
2300: if ((principals = sshbuf_new()) == NULL) {
2301: ret = SSH_ERR_ALLOC_FAIL;
2302: goto out;
2303: }
2304: for (i = 0; i < k->cert->nprincipals; i++) {
2305: if ((ret = sshbuf_put_cstring(principals,
2306: k->cert->principals[i])) != 0)
2307: goto out;
2308: }
2309: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2310: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2311: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2312: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2313: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2314: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2315: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2316: goto out;
2317:
2318: /* Sign the whole mess */
1.53 djm 2319: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2320: sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
1.1 djm 2321: goto out;
2322:
2323: /* Append signature and we are done */
2324: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2325: goto out;
2326: ret = 0;
2327: out:
2328: if (ret != 0)
2329: sshbuf_reset(cert);
1.29 mmcc 2330: free(sig_blob);
2331: free(ca_blob);
1.31 mmcc 2332: sshbuf_free(principals);
1.1 djm 2333: return ret;
1.53 djm 2334: }
2335:
2336: static int
2337: default_key_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
2338: const u_char *data, size_t datalen,
2339: const char *alg, u_int compat, void *ctx)
2340: {
2341: if (ctx != NULL)
2342: return SSH_ERR_INVALID_ARGUMENT;
2343: return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2344: }
2345:
2346: int
2347: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2348: {
2349: return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
1.1 djm 2350: }
2351:
2352: int
2353: sshkey_cert_check_authority(const struct sshkey *k,
2354: int want_host, int require_principal,
2355: const char *name, const char **reason)
2356: {
2357: u_int i, principal_matches;
2358: time_t now = time(NULL);
2359:
2360: if (reason != NULL)
2361: *reason = NULL;
2362:
2363: if (want_host) {
2364: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2365: *reason = "Certificate invalid: not a host certificate";
2366: return SSH_ERR_KEY_CERT_INVALID;
2367: }
2368: } else {
2369: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2370: *reason = "Certificate invalid: not a user certificate";
2371: return SSH_ERR_KEY_CERT_INVALID;
2372: }
2373: }
2374: if (now < 0) {
2375: /* yikes - system clock before epoch! */
2376: *reason = "Certificate invalid: not yet valid";
2377: return SSH_ERR_KEY_CERT_INVALID;
2378: }
2379: if ((u_int64_t)now < k->cert->valid_after) {
2380: *reason = "Certificate invalid: not yet valid";
2381: return SSH_ERR_KEY_CERT_INVALID;
2382: }
2383: if ((u_int64_t)now >= k->cert->valid_before) {
2384: *reason = "Certificate invalid: expired";
2385: return SSH_ERR_KEY_CERT_INVALID;
2386: }
2387: if (k->cert->nprincipals == 0) {
2388: if (require_principal) {
2389: *reason = "Certificate lacks principal list";
2390: return SSH_ERR_KEY_CERT_INVALID;
2391: }
2392: } else if (name != NULL) {
2393: principal_matches = 0;
2394: for (i = 0; i < k->cert->nprincipals; i++) {
2395: if (strcmp(name, k->cert->principals[i]) == 0) {
2396: principal_matches = 1;
2397: break;
2398: }
2399: }
2400: if (!principal_matches) {
2401: *reason = "Certificate invalid: name is not a listed "
2402: "principal";
2403: return SSH_ERR_KEY_CERT_INVALID;
2404: }
2405: }
2406: return 0;
1.27 djm 2407: }
2408:
2409: size_t
2410: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2411: {
2412: char from[32], to[32], ret[64];
2413: time_t tt;
2414: struct tm *tm;
2415:
2416: *from = *to = '\0';
2417: if (cert->valid_after == 0 &&
2418: cert->valid_before == 0xffffffffffffffffULL)
2419: return strlcpy(s, "forever", l);
2420:
2421: if (cert->valid_after != 0) {
2422: /* XXX revisit INT_MAX in 2038 :) */
2423: tt = cert->valid_after > INT_MAX ?
2424: INT_MAX : cert->valid_after;
2425: tm = localtime(&tt);
2426: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2427: }
2428: if (cert->valid_before != 0xffffffffffffffffULL) {
2429: /* XXX revisit INT_MAX in 2038 :) */
2430: tt = cert->valid_before > INT_MAX ?
2431: INT_MAX : cert->valid_before;
2432: tm = localtime(&tt);
2433: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2434: }
2435:
2436: if (cert->valid_after == 0)
2437: snprintf(ret, sizeof(ret), "before %s", to);
2438: else if (cert->valid_before == 0xffffffffffffffffULL)
2439: snprintf(ret, sizeof(ret), "after %s", from);
2440: else
2441: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2442:
2443: return strlcpy(s, ret, l);
1.1 djm 2444: }
2445:
2446: int
2447: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2448: {
2449: int r = SSH_ERR_INTERNAL_ERROR;
2450:
2451: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2452: goto out;
2453: switch (key->type) {
2454: #ifdef WITH_OPENSSL
2455: case KEY_RSA:
2456: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2457: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2458: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2459: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2460: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2461: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2462: goto out;
2463: break;
2464: case KEY_RSA_CERT:
2465: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2466: r = SSH_ERR_INVALID_ARGUMENT;
2467: goto out;
2468: }
2469: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2470: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2471: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2472: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2473: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2474: goto out;
2475: break;
2476: case KEY_DSA:
2477: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2478: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2479: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2480: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2481: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2482: goto out;
2483: break;
2484: case KEY_DSA_CERT:
2485: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2486: r = SSH_ERR_INVALID_ARGUMENT;
2487: goto out;
2488: }
2489: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2490: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2491: goto out;
2492: break;
2493: case KEY_ECDSA:
2494: if ((r = sshbuf_put_cstring(b,
2495: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2496: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2497: (r = sshbuf_put_bignum2(b,
2498: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2499: goto out;
2500: break;
2501: case KEY_ECDSA_CERT:
2502: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2503: r = SSH_ERR_INVALID_ARGUMENT;
2504: goto out;
2505: }
2506: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2507: (r = sshbuf_put_bignum2(b,
2508: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2509: goto out;
2510: break;
2511: #endif /* WITH_OPENSSL */
2512: case KEY_ED25519:
2513: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2514: ED25519_PK_SZ)) != 0 ||
2515: (r = sshbuf_put_string(b, key->ed25519_sk,
2516: ED25519_SK_SZ)) != 0)
2517: goto out;
2518: break;
2519: case KEY_ED25519_CERT:
2520: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2521: r = SSH_ERR_INVALID_ARGUMENT;
2522: goto out;
2523: }
2524: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2525: (r = sshbuf_put_string(b, key->ed25519_pk,
2526: ED25519_PK_SZ)) != 0 ||
2527: (r = sshbuf_put_string(b, key->ed25519_sk,
2528: ED25519_SK_SZ)) != 0)
2529: goto out;
2530: break;
2531: default:
2532: r = SSH_ERR_INVALID_ARGUMENT;
2533: goto out;
2534: }
2535: /* success */
2536: r = 0;
2537: out:
2538: return r;
2539: }
2540:
2541: int
2542: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2543: {
2544: char *tname = NULL, *curve = NULL;
2545: struct sshkey *k = NULL;
1.14 djm 2546: size_t pklen = 0, sklen = 0;
1.1 djm 2547: int type, r = SSH_ERR_INTERNAL_ERROR;
2548: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2549: #ifdef WITH_OPENSSL
2550: BIGNUM *exponent = NULL;
2551: #endif /* WITH_OPENSSL */
2552:
2553: if (kp != NULL)
2554: *kp = NULL;
2555: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2556: goto out;
2557: type = sshkey_type_from_name(tname);
2558: switch (type) {
2559: #ifdef WITH_OPENSSL
2560: case KEY_DSA:
2561: if ((k = sshkey_new_private(type)) == NULL) {
2562: r = SSH_ERR_ALLOC_FAIL;
2563: goto out;
2564: }
2565: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2566: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2567: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2568: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2569: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2570: goto out;
2571: break;
2572: case KEY_DSA_CERT:
1.14 djm 2573: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2574: (r = sshkey_add_private(k)) != 0 ||
2575: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2576: goto out;
2577: break;
2578: case KEY_ECDSA:
2579: if ((k = sshkey_new_private(type)) == NULL) {
2580: r = SSH_ERR_ALLOC_FAIL;
2581: goto out;
2582: }
2583: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2584: r = SSH_ERR_INVALID_ARGUMENT;
2585: goto out;
2586: }
2587: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2588: goto out;
2589: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2590: r = SSH_ERR_EC_CURVE_MISMATCH;
2591: goto out;
2592: }
2593: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2594: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2595: r = SSH_ERR_LIBCRYPTO_ERROR;
2596: goto out;
2597: }
2598: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2599: (r = sshbuf_get_bignum2(buf, exponent)))
2600: goto out;
2601: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2602: r = SSH_ERR_LIBCRYPTO_ERROR;
2603: goto out;
2604: }
2605: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2606: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2607: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2608: goto out;
2609: break;
2610: case KEY_ECDSA_CERT:
2611: if ((exponent = BN_new()) == NULL) {
2612: r = SSH_ERR_LIBCRYPTO_ERROR;
2613: goto out;
2614: }
1.14 djm 2615: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2616: (r = sshkey_add_private(k)) != 0 ||
2617: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2618: goto out;
2619: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2620: r = SSH_ERR_LIBCRYPTO_ERROR;
2621: goto out;
2622: }
2623: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2624: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2625: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2626: goto out;
2627: break;
2628: case KEY_RSA:
2629: if ((k = sshkey_new_private(type)) == NULL) {
2630: r = SSH_ERR_ALLOC_FAIL;
2631: goto out;
2632: }
2633: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2634: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2635: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2636: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2637: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2638: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
1.54 djm 2639: (r = ssh_rsa_generate_additional_parameters(k)) != 0)
1.1 djm 2640: goto out;
1.49 djm 2641: if (BN_num_bits(k->rsa->n) < SSH_RSA_MINIMUM_MODULUS_SIZE) {
2642: r = SSH_ERR_KEY_LENGTH;
2643: goto out;
2644: }
1.1 djm 2645: break;
2646: case KEY_RSA_CERT:
1.14 djm 2647: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2648: (r = sshkey_add_private(k)) != 0 ||
1.22 jsg 2649: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2650: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2651: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2652: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
1.54 djm 2653: (r = ssh_rsa_generate_additional_parameters(k)) != 0)
1.1 djm 2654: goto out;
1.49 djm 2655: if (BN_num_bits(k->rsa->n) < SSH_RSA_MINIMUM_MODULUS_SIZE) {
2656: r = SSH_ERR_KEY_LENGTH;
2657: goto out;
2658: }
1.1 djm 2659: break;
2660: #endif /* WITH_OPENSSL */
2661: case KEY_ED25519:
2662: if ((k = sshkey_new_private(type)) == NULL) {
2663: r = SSH_ERR_ALLOC_FAIL;
2664: goto out;
2665: }
2666: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2667: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2668: goto out;
2669: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2670: r = SSH_ERR_INVALID_FORMAT;
2671: goto out;
2672: }
2673: k->ed25519_pk = ed25519_pk;
2674: k->ed25519_sk = ed25519_sk;
2675: ed25519_pk = ed25519_sk = NULL;
2676: break;
2677: case KEY_ED25519_CERT:
1.14 djm 2678: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2679: (r = sshkey_add_private(k)) != 0 ||
2680: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2681: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2682: goto out;
2683: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2684: r = SSH_ERR_INVALID_FORMAT;
2685: goto out;
2686: }
2687: k->ed25519_pk = ed25519_pk;
2688: k->ed25519_sk = ed25519_sk;
2689: ed25519_pk = ed25519_sk = NULL;
2690: break;
2691: default:
2692: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2693: goto out;
2694: }
2695: #ifdef WITH_OPENSSL
2696: /* enable blinding */
2697: switch (k->type) {
2698: case KEY_RSA:
2699: case KEY_RSA_CERT:
2700: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2701: r = SSH_ERR_LIBCRYPTO_ERROR;
2702: goto out;
2703: }
2704: break;
2705: }
2706: #endif /* WITH_OPENSSL */
2707: /* success */
2708: r = 0;
2709: if (kp != NULL) {
2710: *kp = k;
2711: k = NULL;
2712: }
2713: out:
2714: free(tname);
2715: free(curve);
2716: #ifdef WITH_OPENSSL
2717: if (exponent != NULL)
2718: BN_clear_free(exponent);
2719: #endif /* WITH_OPENSSL */
2720: sshkey_free(k);
2721: if (ed25519_pk != NULL) {
2722: explicit_bzero(ed25519_pk, pklen);
2723: free(ed25519_pk);
2724: }
2725: if (ed25519_sk != NULL) {
2726: explicit_bzero(ed25519_sk, sklen);
2727: free(ed25519_sk);
2728: }
2729: return r;
2730: }
2731:
2732: #ifdef WITH_OPENSSL
2733: int
2734: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2735: {
2736: BN_CTX *bnctx;
2737: EC_POINT *nq = NULL;
2738: BIGNUM *order, *x, *y, *tmp;
2739: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2740:
2741: /*
2742: * NB. This assumes OpenSSL has already verified that the public
2743: * point lies on the curve. This is done by EC_POINT_oct2point()
2744: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2745: * reachable with public points not unmarshalled using
2746: * EC_POINT_oct2point then the caller will need to explicitly check.
2747: */
1.1 djm 2748:
2749: if ((bnctx = BN_CTX_new()) == NULL)
2750: return SSH_ERR_ALLOC_FAIL;
2751: BN_CTX_start(bnctx);
2752:
2753: /*
2754: * We shouldn't ever hit this case because bignum_get_ecpoint()
2755: * refuses to load GF2m points.
2756: */
2757: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2758: NID_X9_62_prime_field)
2759: goto out;
2760:
2761: /* Q != infinity */
2762: if (EC_POINT_is_at_infinity(group, public))
2763: goto out;
2764:
2765: if ((x = BN_CTX_get(bnctx)) == NULL ||
2766: (y = BN_CTX_get(bnctx)) == NULL ||
2767: (order = BN_CTX_get(bnctx)) == NULL ||
2768: (tmp = BN_CTX_get(bnctx)) == NULL) {
2769: ret = SSH_ERR_ALLOC_FAIL;
2770: goto out;
2771: }
2772:
2773: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2774: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2775: EC_POINT_get_affine_coordinates_GFp(group, public,
2776: x, y, bnctx) != 1) {
2777: ret = SSH_ERR_LIBCRYPTO_ERROR;
2778: goto out;
2779: }
2780: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2781: BN_num_bits(y) <= BN_num_bits(order) / 2)
2782: goto out;
2783:
2784: /* nQ == infinity (n == order of subgroup) */
2785: if ((nq = EC_POINT_new(group)) == NULL) {
2786: ret = SSH_ERR_ALLOC_FAIL;
2787: goto out;
2788: }
2789: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2790: ret = SSH_ERR_LIBCRYPTO_ERROR;
2791: goto out;
2792: }
2793: if (EC_POINT_is_at_infinity(group, nq) != 1)
2794: goto out;
2795:
2796: /* x < order - 1, y < order - 1 */
2797: if (!BN_sub(tmp, order, BN_value_one())) {
2798: ret = SSH_ERR_LIBCRYPTO_ERROR;
2799: goto out;
2800: }
2801: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2802: goto out;
2803: ret = 0;
2804: out:
2805: BN_CTX_free(bnctx);
2806: if (nq != NULL)
2807: EC_POINT_free(nq);
2808: return ret;
2809: }
2810:
2811: int
2812: sshkey_ec_validate_private(const EC_KEY *key)
2813: {
2814: BN_CTX *bnctx;
2815: BIGNUM *order, *tmp;
2816: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2817:
2818: if ((bnctx = BN_CTX_new()) == NULL)
2819: return SSH_ERR_ALLOC_FAIL;
2820: BN_CTX_start(bnctx);
2821:
2822: if ((order = BN_CTX_get(bnctx)) == NULL ||
2823: (tmp = BN_CTX_get(bnctx)) == NULL) {
2824: ret = SSH_ERR_ALLOC_FAIL;
2825: goto out;
2826: }
2827:
2828: /* log2(private) > log2(order)/2 */
2829: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2830: ret = SSH_ERR_LIBCRYPTO_ERROR;
2831: goto out;
2832: }
2833: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2834: BN_num_bits(order) / 2)
2835: goto out;
2836:
2837: /* private < order - 1 */
2838: if (!BN_sub(tmp, order, BN_value_one())) {
2839: ret = SSH_ERR_LIBCRYPTO_ERROR;
2840: goto out;
2841: }
2842: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2843: goto out;
2844: ret = 0;
2845: out:
2846: BN_CTX_free(bnctx);
2847: return ret;
2848: }
2849:
2850: void
2851: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2852: {
2853: BIGNUM *x, *y;
2854: BN_CTX *bnctx;
2855:
2856: if (point == NULL) {
2857: fputs("point=(NULL)\n", stderr);
2858: return;
2859: }
2860: if ((bnctx = BN_CTX_new()) == NULL) {
2861: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2862: return;
2863: }
2864: BN_CTX_start(bnctx);
2865: if ((x = BN_CTX_get(bnctx)) == NULL ||
2866: (y = BN_CTX_get(bnctx)) == NULL) {
2867: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2868: return;
2869: }
2870: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2871: NID_X9_62_prime_field) {
2872: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2873: return;
2874: }
2875: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2876: bnctx) != 1) {
2877: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2878: __func__);
2879: return;
2880: }
2881: fputs("x=", stderr);
2882: BN_print_fp(stderr, x);
2883: fputs("\ny=", stderr);
2884: BN_print_fp(stderr, y);
2885: fputs("\n", stderr);
2886: BN_CTX_free(bnctx);
2887: }
2888:
2889: void
2890: sshkey_dump_ec_key(const EC_KEY *key)
2891: {
2892: const BIGNUM *exponent;
2893:
2894: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2895: EC_KEY_get0_public_key(key));
2896: fputs("exponent=", stderr);
2897: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2898: fputs("(NULL)", stderr);
2899: else
2900: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2901: fputs("\n", stderr);
2902: }
2903: #endif /* WITH_OPENSSL */
2904:
2905: static int
2906: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2907: const char *passphrase, const char *comment, const char *ciphername,
2908: int rounds)
2909: {
1.4 djm 2910: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2911: u_char salt[SALT_LEN];
1.4 djm 2912: char *b64 = NULL;
1.1 djm 2913: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2914: u_int check;
2915: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 2916: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 2917: const struct sshcipher *cipher;
2918: const char *kdfname = KDFNAME;
2919: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2920:
2921: if (rounds <= 0)
2922: rounds = DEFAULT_ROUNDS;
2923: if (passphrase == NULL || !strlen(passphrase)) {
2924: ciphername = "none";
2925: kdfname = "none";
2926: } else if (ciphername == NULL)
2927: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 2928: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 2929: r = SSH_ERR_INVALID_ARGUMENT;
2930: goto out;
2931: }
2932:
2933: if ((kdf = sshbuf_new()) == NULL ||
2934: (encoded = sshbuf_new()) == NULL ||
2935: (encrypted = sshbuf_new()) == NULL) {
2936: r = SSH_ERR_ALLOC_FAIL;
2937: goto out;
2938: }
2939: blocksize = cipher_blocksize(cipher);
2940: keylen = cipher_keylen(cipher);
2941: ivlen = cipher_ivlen(cipher);
2942: authlen = cipher_authlen(cipher);
2943: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2944: r = SSH_ERR_ALLOC_FAIL;
2945: goto out;
2946: }
2947: if (strcmp(kdfname, "bcrypt") == 0) {
2948: arc4random_buf(salt, SALT_LEN);
2949: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2950: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2951: r = SSH_ERR_INVALID_ARGUMENT;
2952: goto out;
2953: }
2954: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2955: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2956: goto out;
2957: } else if (strcmp(kdfname, "none") != 0) {
2958: /* Unsupported KDF type */
2959: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2960: goto out;
2961: }
2962: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2963: key + keylen, ivlen, 1)) != 0)
2964: goto out;
2965:
2966: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
2967: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
2968: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
2969: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
2970: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
2971: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
2972: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
2973: goto out;
2974:
2975: /* set up the buffer that will be encrypted */
2976:
2977: /* Random check bytes */
2978: check = arc4random();
2979: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
2980: (r = sshbuf_put_u32(encrypted, check)) != 0)
2981: goto out;
2982:
2983: /* append private key and comment*/
2984: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
2985: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
2986: goto out;
2987:
2988: /* padding */
2989: i = 0;
2990: while (sshbuf_len(encrypted) % blocksize) {
2991: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
2992: goto out;
2993: }
2994:
2995: /* length in destination buffer */
2996: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
2997: goto out;
2998:
2999: /* encrypt */
3000: if ((r = sshbuf_reserve(encoded,
3001: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3002: goto out;
1.36 djm 3003: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3004: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3005: goto out;
3006:
3007: /* uuencode */
3008: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3009: r = SSH_ERR_ALLOC_FAIL;
3010: goto out;
3011: }
3012:
3013: sshbuf_reset(blob);
3014: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3015: goto out;
3016: for (i = 0; i < strlen(b64); i++) {
3017: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3018: goto out;
3019: /* insert line breaks */
3020: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3021: goto out;
3022: }
3023: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3024: goto out;
3025: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3026: goto out;
3027:
3028: /* success */
3029: r = 0;
3030:
3031: out:
3032: sshbuf_free(kdf);
3033: sshbuf_free(encoded);
3034: sshbuf_free(encrypted);
1.36 djm 3035: cipher_free(ciphercontext);
1.1 djm 3036: explicit_bzero(salt, sizeof(salt));
3037: if (key != NULL) {
3038: explicit_bzero(key, keylen + ivlen);
3039: free(key);
3040: }
3041: if (pubkeyblob != NULL) {
3042: explicit_bzero(pubkeyblob, pubkeylen);
3043: free(pubkeyblob);
3044: }
3045: if (b64 != NULL) {
3046: explicit_bzero(b64, strlen(b64));
3047: free(b64);
3048: }
3049: return r;
3050: }
3051:
3052: static int
3053: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3054: struct sshkey **keyp, char **commentp)
3055: {
3056: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3057: const struct sshcipher *cipher = NULL;
3058: const u_char *cp;
3059: int r = SSH_ERR_INTERNAL_ERROR;
3060: size_t encoded_len;
1.18 djm 3061: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3062: struct sshbuf *encoded = NULL, *decoded = NULL;
3063: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3064: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3065: struct sshkey *k = NULL;
3066: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3067: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3068:
3069: if (keyp != NULL)
3070: *keyp = NULL;
3071: if (commentp != NULL)
3072: *commentp = NULL;
3073:
3074: if ((encoded = sshbuf_new()) == NULL ||
3075: (decoded = sshbuf_new()) == NULL ||
3076: (decrypted = sshbuf_new()) == NULL) {
3077: r = SSH_ERR_ALLOC_FAIL;
3078: goto out;
3079: }
3080:
3081: /* check preamble */
3082: cp = sshbuf_ptr(blob);
3083: encoded_len = sshbuf_len(blob);
3084: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3085: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3086: r = SSH_ERR_INVALID_FORMAT;
3087: goto out;
3088: }
3089: cp += MARK_BEGIN_LEN;
3090: encoded_len -= MARK_BEGIN_LEN;
3091:
3092: /* Look for end marker, removing whitespace as we go */
3093: while (encoded_len > 0) {
3094: if (*cp != '\n' && *cp != '\r') {
3095: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3096: goto out;
3097: }
3098: last = *cp;
3099: encoded_len--;
3100: cp++;
3101: if (last == '\n') {
3102: if (encoded_len >= MARK_END_LEN &&
3103: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3104: /* \0 terminate */
3105: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3106: goto out;
3107: break;
3108: }
3109: }
3110: }
3111: if (encoded_len == 0) {
3112: r = SSH_ERR_INVALID_FORMAT;
3113: goto out;
3114: }
3115:
3116: /* decode base64 */
1.4 djm 3117: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3118: goto out;
3119:
3120: /* check magic */
3121: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3122: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3123: r = SSH_ERR_INVALID_FORMAT;
3124: goto out;
3125: }
3126: /* parse public portion of key */
3127: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3128: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3129: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3130: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3131: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3132: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3133: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3134: goto out;
3135:
3136: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3137: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3138: goto out;
3139: }
3140: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3141: strcmp(ciphername, "none") != 0) {
3142: /* passphrase required */
3143: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3144: goto out;
3145: }
3146: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3147: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3148: goto out;
3149: }
3150: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3151: r = SSH_ERR_INVALID_FORMAT;
3152: goto out;
3153: }
3154: if (nkeys != 1) {
3155: /* XXX only one key supported */
3156: r = SSH_ERR_INVALID_FORMAT;
3157: goto out;
3158: }
3159:
3160: /* check size of encrypted key blob */
3161: blocksize = cipher_blocksize(cipher);
3162: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3163: r = SSH_ERR_INVALID_FORMAT;
3164: goto out;
3165: }
3166:
3167: /* setup key */
3168: keylen = cipher_keylen(cipher);
3169: ivlen = cipher_ivlen(cipher);
1.18 djm 3170: authlen = cipher_authlen(cipher);
1.1 djm 3171: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3172: r = SSH_ERR_ALLOC_FAIL;
3173: goto out;
3174: }
3175: if (strcmp(kdfname, "bcrypt") == 0) {
3176: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3177: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3178: goto out;
3179: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3180: key, keylen + ivlen, rounds) < 0) {
3181: r = SSH_ERR_INVALID_FORMAT;
3182: goto out;
3183: }
3184: }
3185:
1.18 djm 3186: /* check that an appropriate amount of auth data is present */
3187: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3188: r = SSH_ERR_INVALID_FORMAT;
3189: goto out;
3190: }
3191:
1.1 djm 3192: /* decrypt private portion of key */
3193: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3194: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3195: key + keylen, ivlen, 0)) != 0)
3196: goto out;
1.36 djm 3197: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3198: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3199: /* an integrity error here indicates an incorrect passphrase */
3200: if (r == SSH_ERR_MAC_INVALID)
3201: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3202: goto out;
3203: }
1.18 djm 3204: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3205: goto out;
3206: /* there should be no trailing data */
3207: if (sshbuf_len(decoded) != 0) {
3208: r = SSH_ERR_INVALID_FORMAT;
3209: goto out;
3210: }
3211:
3212: /* check check bytes */
3213: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3214: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3215: goto out;
3216: if (check1 != check2) {
3217: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3218: goto out;
3219: }
3220:
3221: /* Load the private key and comment */
3222: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3223: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3224: goto out;
3225:
3226: /* Check deterministic padding */
3227: i = 0;
3228: while (sshbuf_len(decrypted)) {
3229: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3230: goto out;
3231: if (pad != (++i & 0xff)) {
3232: r = SSH_ERR_INVALID_FORMAT;
3233: goto out;
3234: }
3235: }
3236:
3237: /* XXX decode pubkey and check against private */
3238:
3239: /* success */
3240: r = 0;
3241: if (keyp != NULL) {
3242: *keyp = k;
3243: k = NULL;
3244: }
3245: if (commentp != NULL) {
3246: *commentp = comment;
3247: comment = NULL;
3248: }
3249: out:
3250: pad = 0;
1.36 djm 3251: cipher_free(ciphercontext);
1.1 djm 3252: free(ciphername);
3253: free(kdfname);
3254: free(comment);
3255: if (salt != NULL) {
3256: explicit_bzero(salt, slen);
3257: free(salt);
3258: }
3259: if (key != NULL) {
3260: explicit_bzero(key, keylen + ivlen);
3261: free(key);
3262: }
3263: sshbuf_free(encoded);
3264: sshbuf_free(decoded);
3265: sshbuf_free(kdf);
3266: sshbuf_free(decrypted);
3267: sshkey_free(k);
3268: return r;
3269: }
3270:
3271:
3272: #ifdef WITH_OPENSSL
3273: /* convert SSH v2 key in OpenSSL PEM format */
3274: static int
3275: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3276: const char *_passphrase, const char *comment)
3277: {
3278: int success, r;
3279: int blen, len = strlen(_passphrase);
3280: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3281: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3282: char *bptr;
1.1 djm 3283: BIO *bio = NULL;
3284:
3285: if (len > 0 && len <= 4)
3286: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3287: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3288: return SSH_ERR_ALLOC_FAIL;
3289:
3290: switch (key->type) {
3291: case KEY_DSA:
3292: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3293: cipher, passphrase, len, NULL, NULL);
3294: break;
3295: case KEY_ECDSA:
3296: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3297: cipher, passphrase, len, NULL, NULL);
3298: break;
3299: case KEY_RSA:
3300: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3301: cipher, passphrase, len, NULL, NULL);
3302: break;
3303: default:
3304: success = 0;
3305: break;
3306: }
3307: if (success == 0) {
3308: r = SSH_ERR_LIBCRYPTO_ERROR;
3309: goto out;
3310: }
3311: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3312: r = SSH_ERR_INTERNAL_ERROR;
3313: goto out;
3314: }
3315: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3316: goto out;
3317: r = 0;
3318: out:
3319: BIO_free(bio);
3320: return r;
3321: }
3322: #endif /* WITH_OPENSSL */
3323:
3324: /* Serialise "key" to buffer "blob" */
3325: int
3326: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3327: const char *passphrase, const char *comment,
3328: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3329: {
3330: switch (key->type) {
1.9 markus 3331: #ifdef WITH_OPENSSL
1.1 djm 3332: case KEY_DSA:
3333: case KEY_ECDSA:
3334: case KEY_RSA:
3335: if (force_new_format) {
3336: return sshkey_private_to_blob2(key, blob, passphrase,
3337: comment, new_format_cipher, new_format_rounds);
3338: }
3339: return sshkey_private_pem_to_blob(key, blob,
3340: passphrase, comment);
3341: #endif /* WITH_OPENSSL */
3342: case KEY_ED25519:
3343: return sshkey_private_to_blob2(key, blob, passphrase,
3344: comment, new_format_cipher, new_format_rounds);
3345: default:
3346: return SSH_ERR_KEY_TYPE_UNKNOWN;
3347: }
3348: }
3349:
3350:
3351: #ifdef WITH_OPENSSL
1.8 djm 3352: static int
1.52 djm 3353: translate_libcrypto_error(unsigned long pem_err)
3354: {
3355: int pem_reason = ERR_GET_REASON(pem_err);
3356:
3357: switch (ERR_GET_LIB(pem_err)) {
3358: case ERR_LIB_PEM:
3359: switch (pem_reason) {
3360: case PEM_R_BAD_PASSWORD_READ:
3361: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3362: case PEM_R_BAD_DECRYPT:
3363: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3364: default:
3365: return SSH_ERR_INVALID_FORMAT;
3366: }
3367: case ERR_LIB_EVP:
3368: switch (pem_reason) {
3369: case EVP_R_BAD_DECRYPT:
3370: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3371: case EVP_R_BN_DECODE_ERROR:
3372: case EVP_R_DECODE_ERROR:
3373: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3374: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3375: #endif
3376: return SSH_ERR_INVALID_FORMAT;
3377: default:
3378: return SSH_ERR_LIBCRYPTO_ERROR;
3379: }
3380: case ERR_LIB_ASN1:
3381: return SSH_ERR_INVALID_FORMAT;
3382: }
3383: return SSH_ERR_LIBCRYPTO_ERROR;
3384: }
3385:
3386: static void
3387: clear_libcrypto_errors(void)
3388: {
3389: while (ERR_get_error() != 0)
3390: ;
3391: }
3392:
3393: /*
3394: * Translate OpenSSL error codes to determine whether
3395: * passphrase is required/incorrect.
3396: */
3397: static int
3398: convert_libcrypto_error(void)
3399: {
3400: /*
3401: * Some password errors are reported at the beginning
3402: * of the error queue.
3403: */
3404: if (translate_libcrypto_error(ERR_peek_error()) ==
3405: SSH_ERR_KEY_WRONG_PASSPHRASE)
3406: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3407: return translate_libcrypto_error(ERR_peek_last_error());
3408: }
3409:
3410: static int
1.1 djm 3411: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3412: const char *passphrase, struct sshkey **keyp)
1.1 djm 3413: {
3414: EVP_PKEY *pk = NULL;
3415: struct sshkey *prv = NULL;
3416: BIO *bio = NULL;
3417: int r;
3418:
1.32 djm 3419: if (keyp != NULL)
3420: *keyp = NULL;
1.1 djm 3421:
3422: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3423: return SSH_ERR_ALLOC_FAIL;
3424: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3425: (int)sshbuf_len(blob)) {
3426: r = SSH_ERR_ALLOC_FAIL;
3427: goto out;
3428: }
3429:
1.52 djm 3430: clear_libcrypto_errors();
1.1 djm 3431: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3432: (char *)passphrase)) == NULL) {
1.52 djm 3433: r = convert_libcrypto_error();
1.1 djm 3434: goto out;
3435: }
3436: if (pk->type == EVP_PKEY_RSA &&
3437: (type == KEY_UNSPEC || type == KEY_RSA)) {
3438: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3439: r = SSH_ERR_ALLOC_FAIL;
3440: goto out;
3441: }
3442: prv->rsa = EVP_PKEY_get1_RSA(pk);
3443: prv->type = KEY_RSA;
3444: #ifdef DEBUG_PK
3445: RSA_print_fp(stderr, prv->rsa, 8);
3446: #endif
3447: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3448: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3449: goto out;
3450: }
3451: if (BN_num_bits(prv->rsa->n) < SSH_RSA_MINIMUM_MODULUS_SIZE) {
3452: r = SSH_ERR_KEY_LENGTH;
1.1 djm 3453: goto out;
3454: }
3455: } else if (pk->type == EVP_PKEY_DSA &&
3456: (type == KEY_UNSPEC || type == KEY_DSA)) {
3457: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3458: r = SSH_ERR_ALLOC_FAIL;
3459: goto out;
3460: }
3461: prv->dsa = EVP_PKEY_get1_DSA(pk);
3462: prv->type = KEY_DSA;
3463: #ifdef DEBUG_PK
3464: DSA_print_fp(stderr, prv->dsa, 8);
3465: #endif
3466: } else if (pk->type == EVP_PKEY_EC &&
3467: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3468: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3469: r = SSH_ERR_ALLOC_FAIL;
3470: goto out;
3471: }
3472: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3473: prv->type = KEY_ECDSA;
3474: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3475: if (prv->ecdsa_nid == -1 ||
3476: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3477: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3478: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3479: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3480: r = SSH_ERR_INVALID_FORMAT;
3481: goto out;
3482: }
3483: #ifdef DEBUG_PK
3484: if (prv != NULL && prv->ecdsa != NULL)
3485: sshkey_dump_ec_key(prv->ecdsa);
3486: #endif
3487: } else {
3488: r = SSH_ERR_INVALID_FORMAT;
3489: goto out;
3490: }
3491: r = 0;
1.32 djm 3492: if (keyp != NULL) {
3493: *keyp = prv;
3494: prv = NULL;
3495: }
1.1 djm 3496: out:
3497: BIO_free(bio);
3498: if (pk != NULL)
3499: EVP_PKEY_free(pk);
1.30 mmcc 3500: sshkey_free(prv);
1.1 djm 3501: return r;
3502: }
3503: #endif /* WITH_OPENSSL */
3504:
3505: int
3506: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3507: const char *passphrase, struct sshkey **keyp, char **commentp)
3508: {
1.42 djm 3509: int r = SSH_ERR_INTERNAL_ERROR;
3510:
1.32 djm 3511: if (keyp != NULL)
3512: *keyp = NULL;
1.1 djm 3513: if (commentp != NULL)
3514: *commentp = NULL;
3515:
3516: switch (type) {
1.9 markus 3517: #ifdef WITH_OPENSSL
1.1 djm 3518: case KEY_DSA:
3519: case KEY_ECDSA:
3520: case KEY_RSA:
1.8 djm 3521: return sshkey_parse_private_pem_fileblob(blob, type,
3522: passphrase, keyp);
1.1 djm 3523: #endif /* WITH_OPENSSL */
3524: case KEY_ED25519:
3525: return sshkey_parse_private2(blob, type, passphrase,
3526: keyp, commentp);
3527: case KEY_UNSPEC:
1.42 djm 3528: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3529: commentp);
3530: /* Do not fallback to PEM parser if only passphrase is wrong. */
3531: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
3532: return r;
1.1 djm 3533: #ifdef WITH_OPENSSL
1.8 djm 3534: return sshkey_parse_private_pem_fileblob(blob, type,
3535: passphrase, keyp);
1.1 djm 3536: #else
3537: return SSH_ERR_INVALID_FORMAT;
3538: #endif /* WITH_OPENSSL */
3539: default:
3540: return SSH_ERR_KEY_TYPE_UNKNOWN;
3541: }
3542: }
3543:
3544: int
3545: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3546: struct sshkey **keyp, char **commentp)
1.1 djm 3547: {
3548: if (keyp != NULL)
3549: *keyp = NULL;
3550: if (commentp != NULL)
3551: *commentp = NULL;
3552:
1.23 tim 3553: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3554: passphrase, keyp, commentp);
1.1 djm 3555: }
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