Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.20
1.20 ! djm 1: /* $OpenBSD: sshkey.c,v 1.19 2015/05/21 04:55:51 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:
1.13 deraadt 28: #include <sys/param.h> /* MIN MAX */
1.1 djm 29: #include <sys/types.h>
1.7 djm 30: #include <netinet/in.h>
1.1 djm 31:
1.12 djm 32: #ifdef WITH_OPENSSL
1.1 djm 33: #include <openssl/evp.h>
34: #include <openssl/err.h>
35: #include <openssl/pem.h>
1.12 djm 36: #endif
1.1 djm 37:
38: #include "crypto_api.h"
39:
40: #include <errno.h>
41: #include <stdio.h>
42: #include <string.h>
43: #include <util.h>
1.13 deraadt 44: #include <limits.h>
1.7 djm 45: #include <resolv.h>
1.1 djm 46:
47: #include "ssh2.h"
48: #include "ssherr.h"
49: #include "misc.h"
50: #include "sshbuf.h"
51: #include "rsa.h"
52: #include "cipher.h"
53: #include "digest.h"
54: #define SSHKEY_INTERNAL
55: #include "sshkey.h"
1.11 djm 56: #include "match.h"
1.1 djm 57:
58: /* openssh private key file format */
59: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
60: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
61: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
62: #define MARK_END_LEN (sizeof(MARK_END) - 1)
63: #define KDFNAME "bcrypt"
64: #define AUTH_MAGIC "openssh-key-v1"
65: #define SALT_LEN 16
66: #define DEFAULT_CIPHERNAME "aes256-cbc"
67: #define DEFAULT_ROUNDS 16
68:
69: /* Version identification string for SSH v1 identity files. */
70: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
71:
1.14 djm 72: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 73: struct sshkey **keyp, int allow_cert);
74:
75: /* Supported key types */
76: struct keytype {
77: const char *name;
78: const char *shortname;
79: int type;
80: int nid;
81: int cert;
82: };
83: static const struct keytype keytypes[] = {
84: { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
85: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
86: KEY_ED25519_CERT, 0, 1 },
87: #ifdef WITH_OPENSSL
88: { NULL, "RSA1", KEY_RSA1, 0, 0 },
89: { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
90: { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
91: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
92: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
93: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
94: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
95: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
96: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
97: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
98: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
99: KEY_ECDSA_CERT, NID_secp384r1, 1 },
100: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
101: KEY_ECDSA_CERT, NID_secp521r1, 1 },
102: #endif /* WITH_OPENSSL */
103: { NULL, NULL, -1, -1, 0 }
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 *
184: key_alg_list(int certs_only, int plain_only)
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++) {
191: if (kt->name == NULL)
192: continue;
193: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
194: continue;
195: if (ret != NULL)
196: ret[rlen++] = '\n';
197: nlen = strlen(kt->name);
198: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
199: free(ret);
200: return NULL;
201: }
202: ret = tmp;
203: memcpy(ret + rlen, kt->name, nlen + 1);
204: rlen += nlen;
205: }
206: return ret;
207: }
208:
209: int
1.11 djm 210: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 211: {
212: char *s, *cp, *p;
1.11 djm 213: const struct keytype *kt;
214: int type;
1.1 djm 215:
216: if (names == NULL || strcmp(names, "") == 0)
217: return 0;
218: if ((s = cp = strdup(names)) == NULL)
219: return 0;
220: for ((p = strsep(&cp, ",")); p && *p != '\0';
221: (p = strsep(&cp, ","))) {
1.11 djm 222: type = sshkey_type_from_name(p);
223: if (type == KEY_RSA1) {
224: free(s);
225: return 0;
226: }
227: if (type == KEY_UNSPEC) {
228: if (allow_wildcard) {
229: /*
230: * Try matching key types against the string.
231: * If any has a positive or negative match then
232: * the component is accepted.
233: */
234: for (kt = keytypes; kt->type != -1; kt++) {
235: if (kt->type == KEY_RSA1)
236: continue;
237: if (match_pattern_list(kt->name,
1.17 djm 238: p, 0) != 0)
1.11 djm 239: break;
240: }
241: if (kt->type != -1)
242: continue;
243: }
1.1 djm 244: free(s);
245: return 0;
246: }
247: }
248: free(s);
249: return 1;
250: }
251:
252: u_int
253: sshkey_size(const struct sshkey *k)
254: {
255: switch (k->type) {
256: #ifdef WITH_OPENSSL
257: case KEY_RSA1:
258: case KEY_RSA:
259: case KEY_RSA_CERT:
260: return BN_num_bits(k->rsa->n);
261: case KEY_DSA:
262: case KEY_DSA_CERT:
263: return BN_num_bits(k->dsa->p);
264: case KEY_ECDSA:
265: case KEY_ECDSA_CERT:
266: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
267: #endif /* WITH_OPENSSL */
268: case KEY_ED25519:
269: case KEY_ED25519_CERT:
270: return 256; /* XXX */
271: }
272: return 0;
273: }
274:
275: static int
276: sshkey_type_is_valid_ca(int type)
277: {
278: switch (type) {
279: case KEY_RSA:
280: case KEY_DSA:
281: case KEY_ECDSA:
282: case KEY_ED25519:
283: return 1;
284: default:
285: return 0;
286: }
287: }
288:
289: int
290: sshkey_is_cert(const struct sshkey *k)
291: {
292: if (k == NULL)
293: return 0;
294: return sshkey_type_is_cert(k->type);
295: }
296:
297: /* Return the cert-less equivalent to a certified key type */
298: int
299: sshkey_type_plain(int type)
300: {
301: switch (type) {
302: case KEY_RSA_CERT:
303: return KEY_RSA;
304: case KEY_DSA_CERT:
305: return KEY_DSA;
306: case KEY_ECDSA_CERT:
307: return KEY_ECDSA;
308: case KEY_ED25519_CERT:
309: return KEY_ED25519;
310: default:
311: return type;
312: }
313: }
314:
315: #ifdef WITH_OPENSSL
316: /* XXX: these are really begging for a table-driven approach */
317: int
318: sshkey_curve_name_to_nid(const char *name)
319: {
320: if (strcmp(name, "nistp256") == 0)
321: return NID_X9_62_prime256v1;
322: else if (strcmp(name, "nistp384") == 0)
323: return NID_secp384r1;
324: else if (strcmp(name, "nistp521") == 0)
325: return NID_secp521r1;
326: else
327: return -1;
328: }
329:
330: u_int
331: sshkey_curve_nid_to_bits(int nid)
332: {
333: switch (nid) {
334: case NID_X9_62_prime256v1:
335: return 256;
336: case NID_secp384r1:
337: return 384;
338: case NID_secp521r1:
339: return 521;
340: default:
341: return 0;
342: }
343: }
344:
345: int
346: sshkey_ecdsa_bits_to_nid(int bits)
347: {
348: switch (bits) {
349: case 256:
350: return NID_X9_62_prime256v1;
351: case 384:
352: return NID_secp384r1;
353: case 521:
354: return NID_secp521r1;
355: default:
356: return -1;
357: }
358: }
359:
360: const char *
361: sshkey_curve_nid_to_name(int nid)
362: {
363: switch (nid) {
364: case NID_X9_62_prime256v1:
365: return "nistp256";
366: case NID_secp384r1:
367: return "nistp384";
368: case NID_secp521r1:
369: return "nistp521";
370: default:
371: return NULL;
372: }
373: }
374:
375: int
376: sshkey_ec_nid_to_hash_alg(int nid)
377: {
378: int kbits = sshkey_curve_nid_to_bits(nid);
379:
380: if (kbits <= 0)
381: return -1;
382:
383: /* RFC5656 section 6.2.1 */
384: if (kbits <= 256)
385: return SSH_DIGEST_SHA256;
386: else if (kbits <= 384)
387: return SSH_DIGEST_SHA384;
388: else
389: return SSH_DIGEST_SHA512;
390: }
391: #endif /* WITH_OPENSSL */
392:
393: static void
394: cert_free(struct sshkey_cert *cert)
395: {
396: u_int i;
397:
398: if (cert == NULL)
399: return;
400: if (cert->certblob != NULL)
401: sshbuf_free(cert->certblob);
402: if (cert->critical != NULL)
403: sshbuf_free(cert->critical);
404: if (cert->extensions != NULL)
405: sshbuf_free(cert->extensions);
406: if (cert->key_id != NULL)
407: free(cert->key_id);
408: for (i = 0; i < cert->nprincipals; i++)
409: free(cert->principals[i]);
410: if (cert->principals != NULL)
411: free(cert->principals);
412: if (cert->signature_key != NULL)
413: sshkey_free(cert->signature_key);
414: explicit_bzero(cert, sizeof(*cert));
415: free(cert);
416: }
417:
418: static struct sshkey_cert *
419: cert_new(void)
420: {
421: struct sshkey_cert *cert;
422:
423: if ((cert = calloc(1, sizeof(*cert))) == NULL)
424: return NULL;
425: if ((cert->certblob = sshbuf_new()) == NULL ||
426: (cert->critical = sshbuf_new()) == NULL ||
427: (cert->extensions = sshbuf_new()) == NULL) {
428: cert_free(cert);
429: return NULL;
430: }
431: cert->key_id = NULL;
432: cert->principals = NULL;
433: cert->signature_key = NULL;
434: return cert;
435: }
436:
437: struct sshkey *
438: sshkey_new(int type)
439: {
440: struct sshkey *k;
441: #ifdef WITH_OPENSSL
442: RSA *rsa;
443: DSA *dsa;
444: #endif /* WITH_OPENSSL */
445:
446: if ((k = calloc(1, sizeof(*k))) == NULL)
447: return NULL;
448: k->type = type;
449: k->ecdsa = NULL;
450: k->ecdsa_nid = -1;
451: k->dsa = NULL;
452: k->rsa = NULL;
453: k->cert = NULL;
454: k->ed25519_sk = NULL;
455: k->ed25519_pk = NULL;
456: switch (k->type) {
457: #ifdef WITH_OPENSSL
458: case KEY_RSA1:
459: case KEY_RSA:
460: case KEY_RSA_CERT:
461: if ((rsa = RSA_new()) == NULL ||
462: (rsa->n = BN_new()) == NULL ||
463: (rsa->e = BN_new()) == NULL) {
464: if (rsa != NULL)
465: RSA_free(rsa);
466: free(k);
467: return NULL;
468: }
469: k->rsa = rsa;
470: break;
471: case KEY_DSA:
472: case KEY_DSA_CERT:
473: if ((dsa = DSA_new()) == NULL ||
474: (dsa->p = BN_new()) == NULL ||
475: (dsa->q = BN_new()) == NULL ||
476: (dsa->g = BN_new()) == NULL ||
477: (dsa->pub_key = BN_new()) == NULL) {
478: if (dsa != NULL)
479: DSA_free(dsa);
480: free(k);
481: return NULL;
482: }
483: k->dsa = dsa;
484: break;
485: case KEY_ECDSA:
486: case KEY_ECDSA_CERT:
487: /* Cannot do anything until we know the group */
488: break;
489: #endif /* WITH_OPENSSL */
490: case KEY_ED25519:
491: case KEY_ED25519_CERT:
492: /* no need to prealloc */
493: break;
494: case KEY_UNSPEC:
495: break;
496: default:
497: free(k);
498: return NULL;
499: break;
500: }
501:
502: if (sshkey_is_cert(k)) {
503: if ((k->cert = cert_new()) == NULL) {
504: sshkey_free(k);
505: return NULL;
506: }
507: }
508:
509: return k;
510: }
511:
512: int
513: sshkey_add_private(struct sshkey *k)
514: {
515: switch (k->type) {
516: #ifdef WITH_OPENSSL
517: case KEY_RSA1:
518: case KEY_RSA:
519: case KEY_RSA_CERT:
520: #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
521: if (bn_maybe_alloc_failed(k->rsa->d) ||
522: bn_maybe_alloc_failed(k->rsa->iqmp) ||
523: bn_maybe_alloc_failed(k->rsa->q) ||
524: bn_maybe_alloc_failed(k->rsa->p) ||
525: bn_maybe_alloc_failed(k->rsa->dmq1) ||
526: bn_maybe_alloc_failed(k->rsa->dmp1))
527: return SSH_ERR_ALLOC_FAIL;
528: break;
529: case KEY_DSA:
530: case KEY_DSA_CERT:
531: if (bn_maybe_alloc_failed(k->dsa->priv_key))
532: return SSH_ERR_ALLOC_FAIL;
533: break;
534: #undef bn_maybe_alloc_failed
535: case KEY_ECDSA:
536: case KEY_ECDSA_CERT:
537: /* Cannot do anything until we know the group */
538: break;
539: #endif /* WITH_OPENSSL */
540: case KEY_ED25519:
541: case KEY_ED25519_CERT:
542: /* no need to prealloc */
543: break;
544: case KEY_UNSPEC:
545: break;
546: default:
547: return SSH_ERR_INVALID_ARGUMENT;
548: }
549: return 0;
550: }
551:
552: struct sshkey *
553: sshkey_new_private(int type)
554: {
555: struct sshkey *k = sshkey_new(type);
556:
557: if (k == NULL)
558: return NULL;
559: if (sshkey_add_private(k) != 0) {
560: sshkey_free(k);
561: return NULL;
562: }
563: return k;
564: }
565:
566: void
567: sshkey_free(struct sshkey *k)
568: {
569: if (k == NULL)
570: return;
571: switch (k->type) {
572: #ifdef WITH_OPENSSL
573: case KEY_RSA1:
574: case KEY_RSA:
575: case KEY_RSA_CERT:
576: if (k->rsa != NULL)
577: RSA_free(k->rsa);
578: k->rsa = NULL;
579: break;
580: case KEY_DSA:
581: case KEY_DSA_CERT:
582: if (k->dsa != NULL)
583: DSA_free(k->dsa);
584: k->dsa = NULL;
585: break;
586: case KEY_ECDSA:
587: case KEY_ECDSA_CERT:
588: if (k->ecdsa != NULL)
589: EC_KEY_free(k->ecdsa);
590: k->ecdsa = NULL;
591: break;
592: #endif /* WITH_OPENSSL */
593: case KEY_ED25519:
594: case KEY_ED25519_CERT:
595: if (k->ed25519_pk) {
596: explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
597: free(k->ed25519_pk);
598: k->ed25519_pk = NULL;
599: }
600: if (k->ed25519_sk) {
601: explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
602: free(k->ed25519_sk);
603: k->ed25519_sk = NULL;
604: }
605: break;
606: case KEY_UNSPEC:
607: break;
608: default:
609: break;
610: }
611: if (sshkey_is_cert(k))
612: cert_free(k->cert);
613: explicit_bzero(k, sizeof(*k));
614: free(k);
615: }
616:
617: static int
618: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
619: {
620: if (a == NULL && b == NULL)
621: return 1;
622: if (a == NULL || b == NULL)
623: return 0;
624: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
625: return 0;
626: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
627: sshbuf_len(a->certblob)) != 0)
628: return 0;
629: return 1;
630: }
631:
632: /*
633: * Compare public portions of key only, allowing comparisons between
634: * certificates and plain keys too.
635: */
636: int
637: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
638: {
639: #ifdef WITH_OPENSSL
640: BN_CTX *bnctx;
641: #endif /* WITH_OPENSSL */
642:
643: if (a == NULL || b == NULL ||
644: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
645: return 0;
646:
647: switch (a->type) {
648: #ifdef WITH_OPENSSL
649: case KEY_RSA1:
650: case KEY_RSA_CERT:
651: case KEY_RSA:
652: return a->rsa != NULL && b->rsa != NULL &&
653: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
654: BN_cmp(a->rsa->n, b->rsa->n) == 0;
655: case KEY_DSA_CERT:
656: case KEY_DSA:
657: return a->dsa != NULL && b->dsa != NULL &&
658: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
659: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
660: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
661: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
662: case KEY_ECDSA_CERT:
663: case KEY_ECDSA:
664: if (a->ecdsa == NULL || b->ecdsa == NULL ||
665: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
666: EC_KEY_get0_public_key(b->ecdsa) == NULL)
667: return 0;
668: if ((bnctx = BN_CTX_new()) == NULL)
669: return 0;
670: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
671: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
672: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
673: EC_KEY_get0_public_key(a->ecdsa),
674: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
675: BN_CTX_free(bnctx);
676: return 0;
677: }
678: BN_CTX_free(bnctx);
679: return 1;
680: #endif /* WITH_OPENSSL */
681: case KEY_ED25519:
682: case KEY_ED25519_CERT:
683: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
684: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
685: default:
686: return 0;
687: }
688: /* NOTREACHED */
689: }
690:
691: int
692: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
693: {
694: if (a == NULL || b == NULL || a->type != b->type)
695: return 0;
696: if (sshkey_is_cert(a)) {
697: if (!cert_compare(a->cert, b->cert))
698: return 0;
699: }
700: return sshkey_equal_public(a, b);
701: }
702:
703: static int
704: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
705: {
706: int type, ret = SSH_ERR_INTERNAL_ERROR;
707: const char *typename;
708:
709: if (key == NULL)
710: return SSH_ERR_INVALID_ARGUMENT;
711:
1.19 djm 712: if (sshkey_is_cert(key)) {
713: if (key->cert == NULL)
714: return SSH_ERR_EXPECTED_CERT;
715: if (sshbuf_len(key->cert->certblob) == 0)
716: return SSH_ERR_KEY_LACKS_CERTBLOB;
717: }
1.1 djm 718: type = force_plain ? sshkey_type_plain(key->type) : key->type;
719: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
720:
721: switch (type) {
722: #ifdef WITH_OPENSSL
723: case KEY_DSA_CERT:
724: case KEY_ECDSA_CERT:
725: case KEY_RSA_CERT:
726: #endif /* WITH_OPENSSL */
727: case KEY_ED25519_CERT:
728: /* Use the existing blob */
729: /* XXX modified flag? */
730: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
731: return ret;
732: break;
733: #ifdef WITH_OPENSSL
734: case KEY_DSA:
735: if (key->dsa == NULL)
736: return SSH_ERR_INVALID_ARGUMENT;
737: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
738: (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
739: (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
740: (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
741: (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
742: return ret;
743: break;
744: case KEY_ECDSA:
745: if (key->ecdsa == NULL)
746: return SSH_ERR_INVALID_ARGUMENT;
747: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
748: (ret = sshbuf_put_cstring(b,
749: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
750: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
751: return ret;
752: break;
753: case KEY_RSA:
754: if (key->rsa == NULL)
755: return SSH_ERR_INVALID_ARGUMENT;
756: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
757: (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
758: (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
759: return ret;
760: break;
761: #endif /* WITH_OPENSSL */
762: case KEY_ED25519:
763: if (key->ed25519_pk == NULL)
764: return SSH_ERR_INVALID_ARGUMENT;
765: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
766: (ret = sshbuf_put_string(b,
767: key->ed25519_pk, ED25519_PK_SZ)) != 0)
768: return ret;
769: break;
770: default:
771: return SSH_ERR_KEY_TYPE_UNKNOWN;
772: }
773: return 0;
774: }
775:
776: int
1.14 djm 777: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 778: {
779: return to_blob_buf(key, b, 0);
780: }
781:
782: int
1.14 djm 783: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
784: {
785: struct sshbuf *tmp;
786: int r;
787:
788: if ((tmp = sshbuf_new()) == NULL)
789: return SSH_ERR_ALLOC_FAIL;
790: r = to_blob_buf(key, tmp, 0);
791: if (r == 0)
792: r = sshbuf_put_stringb(b, tmp);
793: sshbuf_free(tmp);
794: return r;
795: }
796:
797: int
798: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 799: {
800: return to_blob_buf(key, b, 1);
801: }
802:
803: static int
804: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
805: {
806: int ret = SSH_ERR_INTERNAL_ERROR;
807: size_t len;
808: struct sshbuf *b = NULL;
809:
810: if (lenp != NULL)
811: *lenp = 0;
812: if (blobp != NULL)
813: *blobp = NULL;
814: if ((b = sshbuf_new()) == NULL)
815: return SSH_ERR_ALLOC_FAIL;
816: if ((ret = to_blob_buf(key, b, force_plain)) != 0)
817: goto out;
818: len = sshbuf_len(b);
819: if (lenp != NULL)
820: *lenp = len;
821: if (blobp != NULL) {
822: if ((*blobp = malloc(len)) == NULL) {
823: ret = SSH_ERR_ALLOC_FAIL;
824: goto out;
825: }
826: memcpy(*blobp, sshbuf_ptr(b), len);
827: }
828: ret = 0;
829: out:
830: sshbuf_free(b);
831: return ret;
832: }
833:
834: int
835: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
836: {
837: return to_blob(key, blobp, lenp, 0);
838: }
839:
840: int
841: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
842: {
843: return to_blob(key, blobp, lenp, 1);
844: }
845:
846: int
1.7 djm 847: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 848: u_char **retp, size_t *lenp)
849: {
850: u_char *blob = NULL, *ret = NULL;
851: size_t blob_len = 0;
1.7 djm 852: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 853:
854: if (retp != NULL)
855: *retp = NULL;
856: if (lenp != NULL)
857: *lenp = 0;
1.7 djm 858: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 859: r = SSH_ERR_INVALID_ARGUMENT;
860: goto out;
861: }
862:
863: if (k->type == KEY_RSA1) {
864: #ifdef WITH_OPENSSL
865: int nlen = BN_num_bytes(k->rsa->n);
866: int elen = BN_num_bytes(k->rsa->e);
867:
868: blob_len = nlen + elen;
869: if (nlen >= INT_MAX - elen ||
870: (blob = malloc(blob_len)) == NULL) {
871: r = SSH_ERR_ALLOC_FAIL;
872: goto out;
873: }
874: BN_bn2bin(k->rsa->n, blob);
875: BN_bn2bin(k->rsa->e, blob + nlen);
876: #endif /* WITH_OPENSSL */
877: } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
878: goto out;
879: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
880: r = SSH_ERR_ALLOC_FAIL;
881: goto out;
882: }
1.7 djm 883: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 884: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
885: goto out;
886: /* success */
887: if (retp != NULL) {
888: *retp = ret;
889: ret = NULL;
890: }
891: if (lenp != NULL)
1.7 djm 892: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 893: r = 0;
894: out:
895: free(ret);
896: if (blob != NULL) {
897: explicit_bzero(blob, blob_len);
898: free(blob);
899: }
900: return r;
901: }
902:
903: static char *
1.7 djm 904: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
905: {
906: char *ret;
907: size_t plen = strlen(alg) + 1;
908: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
909: int r;
910:
911: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
912: return NULL;
913: strlcpy(ret, alg, rlen);
914: strlcat(ret, ":", rlen);
915: if (dgst_raw_len == 0)
916: return ret;
917: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
918: ret + plen, rlen - plen)) == -1) {
919: explicit_bzero(ret, rlen);
920: free(ret);
921: return NULL;
922: }
923: /* Trim padding characters from end */
924: ret[strcspn(ret, "=")] = '\0';
925: return ret;
926: }
927:
928: static char *
929: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 930: {
1.7 djm 931: char *retval, hex[5];
932: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 933:
1.7 djm 934: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 935: return NULL;
1.7 djm 936: strlcpy(retval, alg, rlen);
937: strlcat(retval, ":", rlen);
1.1 djm 938: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 939: snprintf(hex, sizeof(hex), "%s%02x",
940: i > 0 ? ":" : "", dgst_raw[i]);
941: strlcat(retval, hex, rlen);
1.1 djm 942: }
943: return retval;
944: }
945:
946: static char *
947: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
948: {
949: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
950: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
951: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
952: u_int i, j = 0, rounds, seed = 1;
953: char *retval;
954:
955: rounds = (dgst_raw_len / 2) + 1;
956: if ((retval = calloc(rounds, 6)) == NULL)
957: return NULL;
958: retval[j++] = 'x';
959: for (i = 0; i < rounds; i++) {
960: u_int idx0, idx1, idx2, idx3, idx4;
961: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
962: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
963: seed) % 6;
964: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
965: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
966: (seed / 6)) % 6;
967: retval[j++] = vowels[idx0];
968: retval[j++] = consonants[idx1];
969: retval[j++] = vowels[idx2];
970: if ((i + 1) < rounds) {
971: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
972: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
973: retval[j++] = consonants[idx3];
974: retval[j++] = '-';
975: retval[j++] = consonants[idx4];
976: seed = ((seed * 5) +
977: ((((u_int)(dgst_raw[2 * i])) * 7) +
978: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
979: }
980: } else {
981: idx0 = seed % 6;
982: idx1 = 16;
983: idx2 = seed / 6;
984: retval[j++] = vowels[idx0];
985: retval[j++] = consonants[idx1];
986: retval[j++] = vowels[idx2];
987: }
988: }
989: retval[j++] = 'x';
990: retval[j++] = '\0';
991: return retval;
992: }
993:
994: /*
995: * Draw an ASCII-Art representing the fingerprint so human brain can
996: * profit from its built-in pattern recognition ability.
997: * This technique is called "random art" and can be found in some
998: * scientific publications like this original paper:
999: *
1000: * "Hash Visualization: a New Technique to improve Real-World Security",
1001: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1002: * Techniques and E-Commerce (CrypTEC '99)
1003: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1004: *
1005: * The subject came up in a talk by Dan Kaminsky, too.
1006: *
1007: * If you see the picture is different, the key is different.
1008: * If the picture looks the same, you still know nothing.
1009: *
1010: * The algorithm used here is a worm crawling over a discrete plane,
1011: * leaving a trace (augmenting the field) everywhere it goes.
1012: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1013: * makes the respective movement vector be ignored for this turn.
1014: * Graphs are not unambiguous, because circles in graphs can be
1015: * walked in either direction.
1016: */
1017:
1018: /*
1019: * Field sizes for the random art. Have to be odd, so the starting point
1020: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1021: * Else pictures would be too dense, and drawing the frame would
1022: * fail, too, because the key type would not fit in anymore.
1023: */
1024: #define FLDBASE 8
1025: #define FLDSIZE_Y (FLDBASE + 1)
1026: #define FLDSIZE_X (FLDBASE * 2 + 1)
1027: static char *
1.7 djm 1028: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1029: const struct sshkey *k)
1030: {
1031: /*
1032: * Chars to be used after each other every time the worm
1033: * intersects with itself. Matter of taste.
1034: */
1035: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1036: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1037: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1038: size_t i, tlen, hlen;
1.1 djm 1039: u_int b;
1.3 djm 1040: int x, y, r;
1.1 djm 1041: size_t len = strlen(augmentation_string) - 1;
1042:
1043: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1044: return NULL;
1045:
1046: /* initialize field */
1047: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1048: x = FLDSIZE_X / 2;
1049: y = FLDSIZE_Y / 2;
1050:
1051: /* process raw key */
1052: for (i = 0; i < dgst_raw_len; i++) {
1053: int input;
1054: /* each byte conveys four 2-bit move commands */
1055: input = dgst_raw[i];
1056: for (b = 0; b < 4; b++) {
1057: /* evaluate 2 bit, rest is shifted later */
1058: x += (input & 0x1) ? 1 : -1;
1059: y += (input & 0x2) ? 1 : -1;
1060:
1061: /* assure we are still in bounds */
1062: x = MAX(x, 0);
1063: y = MAX(y, 0);
1064: x = MIN(x, FLDSIZE_X - 1);
1065: y = MIN(y, FLDSIZE_Y - 1);
1066:
1067: /* augment the field */
1068: if (field[x][y] < len - 2)
1069: field[x][y]++;
1070: input = input >> 2;
1071: }
1072: }
1073:
1074: /* mark starting point and end point*/
1075: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1076: field[x][y] = len;
1077:
1.3 djm 1078: /* assemble title */
1079: r = snprintf(title, sizeof(title), "[%s %u]",
1080: sshkey_type(k), sshkey_size(k));
1081: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1082: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1083: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1084: tlen = (r <= 0) ? 0 : strlen(title);
1085:
1086: /* assemble hash ID. */
1087: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1088: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1089:
1090: /* output upper border */
1.3 djm 1091: p = retval;
1092: *p++ = '+';
1093: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1094: *p++ = '-';
1095: memcpy(p, title, tlen);
1096: p += tlen;
1.7 djm 1097: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1098: *p++ = '-';
1099: *p++ = '+';
1100: *p++ = '\n';
1101:
1102: /* output content */
1103: for (y = 0; y < FLDSIZE_Y; y++) {
1104: *p++ = '|';
1105: for (x = 0; x < FLDSIZE_X; x++)
1106: *p++ = augmentation_string[MIN(field[x][y], len)];
1107: *p++ = '|';
1108: *p++ = '\n';
1109: }
1110:
1111: /* output lower border */
1112: *p++ = '+';
1.7 djm 1113: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1114: *p++ = '-';
1115: memcpy(p, hash, hlen);
1116: p += hlen;
1117: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1118: *p++ = '-';
1119: *p++ = '+';
1120:
1121: return retval;
1122: }
1123:
1124: char *
1.7 djm 1125: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1126: enum sshkey_fp_rep dgst_rep)
1127: {
1128: char *retval = NULL;
1129: u_char *dgst_raw;
1130: size_t dgst_raw_len;
1131:
1.7 djm 1132: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1133: return NULL;
1134: switch (dgst_rep) {
1.7 djm 1135: case SSH_FP_DEFAULT:
1136: if (dgst_alg == SSH_DIGEST_MD5) {
1137: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1138: dgst_raw, dgst_raw_len);
1139: } else {
1140: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1141: dgst_raw, dgst_raw_len);
1142: }
1143: break;
1.1 djm 1144: case SSH_FP_HEX:
1.7 djm 1145: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1146: dgst_raw, dgst_raw_len);
1147: break;
1148: case SSH_FP_BASE64:
1149: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1150: dgst_raw, dgst_raw_len);
1.1 djm 1151: break;
1152: case SSH_FP_BUBBLEBABBLE:
1153: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1154: break;
1155: case SSH_FP_RANDOMART:
1.7 djm 1156: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1157: dgst_raw, dgst_raw_len, k);
1.1 djm 1158: break;
1159: default:
1160: explicit_bzero(dgst_raw, dgst_raw_len);
1161: free(dgst_raw);
1162: return NULL;
1163: }
1164: explicit_bzero(dgst_raw, dgst_raw_len);
1165: free(dgst_raw);
1166: return retval;
1167: }
1168:
1169: #ifdef WITH_SSH1
1170: /*
1171: * Reads a multiple-precision integer in decimal from the buffer, and advances
1172: * the pointer. The integer must already be initialized. This function is
1173: * permitted to modify the buffer. This leaves *cpp to point just beyond the
1174: * last processed character.
1175: */
1176: static int
1177: read_decimal_bignum(char **cpp, BIGNUM *v)
1178: {
1179: char *cp;
1180: size_t e;
1181: int skip = 1; /* skip white space */
1182:
1183: cp = *cpp;
1184: while (*cp == ' ' || *cp == '\t')
1185: cp++;
1186: e = strspn(cp, "0123456789");
1187: if (e == 0)
1188: return SSH_ERR_INVALID_FORMAT;
1189: if (e > SSHBUF_MAX_BIGNUM * 3)
1190: return SSH_ERR_BIGNUM_TOO_LARGE;
1191: if (cp[e] == '\0')
1192: skip = 0;
1193: else if (index(" \t\r\n", cp[e]) == NULL)
1194: return SSH_ERR_INVALID_FORMAT;
1195: cp[e] = '\0';
1196: if (BN_dec2bn(&v, cp) <= 0)
1197: return SSH_ERR_INVALID_FORMAT;
1198: *cpp = cp + e + skip;
1199: return 0;
1200: }
1201: #endif /* WITH_SSH1 */
1202:
1203: /* returns 0 ok, and < 0 error */
1204: int
1205: sshkey_read(struct sshkey *ret, char **cpp)
1206: {
1207: struct sshkey *k;
1208: int retval = SSH_ERR_INVALID_FORMAT;
1209: char *cp, *space;
1210: int r, type, curve_nid = -1;
1211: struct sshbuf *blob;
1212: #ifdef WITH_SSH1
1213: char *ep;
1214: u_long bits;
1215: #endif /* WITH_SSH1 */
1216:
1217: cp = *cpp;
1218:
1219: switch (ret->type) {
1220: case KEY_RSA1:
1221: #ifdef WITH_SSH1
1222: /* Get number of bits. */
1223: bits = strtoul(cp, &ep, 10);
1224: if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1225: bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1226: return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1227: /* Get public exponent, public modulus. */
1228: if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1229: return r;
1230: if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1231: return r;
1232: *cpp = ep;
1233: /* validate the claimed number of bits */
1234: if (BN_num_bits(ret->rsa->n) != (int)bits)
1235: return SSH_ERR_KEY_BITS_MISMATCH;
1236: retval = 0;
1237: #endif /* WITH_SSH1 */
1238: break;
1239: case KEY_UNSPEC:
1240: case KEY_RSA:
1241: case KEY_DSA:
1242: case KEY_ECDSA:
1243: case KEY_ED25519:
1244: case KEY_DSA_CERT:
1245: case KEY_ECDSA_CERT:
1246: case KEY_RSA_CERT:
1247: case KEY_ED25519_CERT:
1248: space = strchr(cp, ' ');
1249: if (space == NULL)
1250: return SSH_ERR_INVALID_FORMAT;
1251: *space = '\0';
1252: type = sshkey_type_from_name(cp);
1253: if (sshkey_type_plain(type) == KEY_ECDSA &&
1254: (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1255: return SSH_ERR_EC_CURVE_INVALID;
1256: *space = ' ';
1257: if (type == KEY_UNSPEC)
1258: return SSH_ERR_INVALID_FORMAT;
1259: cp = space+1;
1260: if (*cp == '\0')
1261: return SSH_ERR_INVALID_FORMAT;
1.5 djm 1262: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1263: return SSH_ERR_KEY_TYPE_MISMATCH;
1264: if ((blob = sshbuf_new()) == NULL)
1265: return SSH_ERR_ALLOC_FAIL;
1266: /* trim comment */
1267: space = strchr(cp, ' ');
1.10 markus 1268: if (space) {
1269: /* advance 'space': skip whitespace */
1270: *space++ = '\0';
1271: while (*space == ' ' || *space == '\t')
1272: space++;
1273: *cpp = space;
1274: } else
1275: *cpp = cp + strlen(cp);
1.1 djm 1276: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1277: sshbuf_free(blob);
1278: return r;
1279: }
1280: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1281: sshbuf_len(blob), &k)) != 0) {
1282: sshbuf_free(blob);
1283: return r;
1284: }
1285: sshbuf_free(blob);
1286: if (k->type != type) {
1287: sshkey_free(k);
1288: return SSH_ERR_KEY_TYPE_MISMATCH;
1289: }
1290: if (sshkey_type_plain(type) == KEY_ECDSA &&
1291: curve_nid != k->ecdsa_nid) {
1292: sshkey_free(k);
1293: return SSH_ERR_EC_CURVE_MISMATCH;
1294: }
1.5 djm 1295: ret->type = type;
1.1 djm 1296: if (sshkey_is_cert(ret)) {
1297: if (!sshkey_is_cert(k)) {
1298: sshkey_free(k);
1299: return SSH_ERR_EXPECTED_CERT;
1300: }
1301: if (ret->cert != NULL)
1302: cert_free(ret->cert);
1303: ret->cert = k->cert;
1304: k->cert = NULL;
1305: }
1306: #ifdef WITH_OPENSSL
1307: if (sshkey_type_plain(ret->type) == KEY_RSA) {
1308: if (ret->rsa != NULL)
1309: RSA_free(ret->rsa);
1310: ret->rsa = k->rsa;
1311: k->rsa = NULL;
1312: #ifdef DEBUG_PK
1313: RSA_print_fp(stderr, ret->rsa, 8);
1314: #endif
1315: }
1316: if (sshkey_type_plain(ret->type) == KEY_DSA) {
1317: if (ret->dsa != NULL)
1318: DSA_free(ret->dsa);
1319: ret->dsa = k->dsa;
1320: k->dsa = NULL;
1321: #ifdef DEBUG_PK
1322: DSA_print_fp(stderr, ret->dsa, 8);
1323: #endif
1324: }
1325: if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1326: if (ret->ecdsa != NULL)
1327: EC_KEY_free(ret->ecdsa);
1328: ret->ecdsa = k->ecdsa;
1329: ret->ecdsa_nid = k->ecdsa_nid;
1330: k->ecdsa = NULL;
1331: k->ecdsa_nid = -1;
1332: #ifdef DEBUG_PK
1333: sshkey_dump_ec_key(ret->ecdsa);
1334: #endif
1335: }
1336: #endif /* WITH_OPENSSL */
1337: if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1338: free(ret->ed25519_pk);
1339: ret->ed25519_pk = k->ed25519_pk;
1340: k->ed25519_pk = NULL;
1341: #ifdef DEBUG_PK
1342: /* XXX */
1343: #endif
1344: }
1345: retval = 0;
1346: /*XXXX*/
1347: sshkey_free(k);
1348: if (retval != 0)
1349: break;
1350: break;
1351: default:
1352: return SSH_ERR_INVALID_ARGUMENT;
1353: }
1354: return retval;
1355: }
1356:
1357: int
1.19 djm 1358: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1359: {
1.19 djm 1360: int r = SSH_ERR_INTERNAL_ERROR;
1361: struct sshbuf *b = NULL;
1.1 djm 1362: char *uu = NULL;
1.19 djm 1363:
1364: if (b64p != NULL)
1365: *b64p = NULL;
1366: if ((b = sshbuf_new()) == NULL)
1367: return SSH_ERR_ALLOC_FAIL;
1368: if ((r = sshkey_putb(key, b)) != 0)
1369: goto out;
1370: if ((uu = sshbuf_dtob64(b)) == NULL) {
1371: r = SSH_ERR_ALLOC_FAIL;
1372: goto out;
1373: }
1374: /* Success */
1375: if (b64p != NULL) {
1376: *b64p = uu;
1377: uu = NULL;
1378: }
1379: r = 0;
1380: out:
1381: sshbuf_free(b);
1382: free(uu);
1383: return r;
1384: }
1385:
1386: static int
1387: sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
1388: {
1389: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1390: #ifdef WITH_SSH1
1391: u_int bits = 0;
1392: char *dec_e = NULL, *dec_n = NULL;
1393:
1.19 djm 1394: if (key->rsa == NULL || key->rsa->e == NULL ||
1395: key->rsa->n == NULL) {
1396: r = SSH_ERR_INVALID_ARGUMENT;
1397: goto out;
1398: }
1399: if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1400: (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1401: r = SSH_ERR_ALLOC_FAIL;
1402: goto out;
1403: }
1404: /* size of modulus 'n' */
1405: if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1406: r = SSH_ERR_INVALID_ARGUMENT;
1407: goto out;
1.1 djm 1408: }
1.19 djm 1409: if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1410: goto out;
1411:
1412: /* Success */
1413: r = 0;
1414: out:
1415: if (dec_e != NULL)
1416: OPENSSL_free(dec_e);
1417: if (dec_n != NULL)
1418: OPENSSL_free(dec_n);
1.1 djm 1419: #endif /* WITH_SSH1 */
1.19 djm 1420:
1421: return r;
1422: }
1423:
1424: static int
1425: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1426: {
1427: int r = SSH_ERR_INTERNAL_ERROR;
1428: char *uu = NULL;
1429:
1430: if (key->type == KEY_RSA1) {
1431: if ((r = sshkey_format_rsa1(key, b)) != 0)
1.1 djm 1432: goto out;
1.19 djm 1433: } else {
1434: /* Unsupported key types handled in sshkey_to_base64() */
1435: if ((r = sshkey_to_base64(key, &uu)) != 0)
1.1 djm 1436: goto out;
1.19 djm 1437: if ((r = sshbuf_putf(b, "%s %s",
1438: sshkey_ssh_name(key), uu)) != 0)
1.1 djm 1439: goto out;
1.19 djm 1440: }
1441: r = 0;
1442: out:
1443: free(uu);
1444: return r;
1445: }
1446:
1447: int
1448: sshkey_write(const struct sshkey *key, FILE *f)
1449: {
1450: struct sshbuf *b = NULL;
1451: int r = SSH_ERR_INTERNAL_ERROR;
1452:
1453: if ((b = sshbuf_new()) == NULL)
1454: return SSH_ERR_ALLOC_FAIL;
1455: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1456: goto out;
1457: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1458: if (feof(f))
1459: errno = EPIPE;
1.19 djm 1460: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1461: goto out;
1462: }
1.19 djm 1463: /* Success */
1464: r = 0;
1.1 djm 1465: out:
1.19 djm 1466: sshbuf_free(b);
1467: return r;
1.1 djm 1468: }
1469:
1470: const char *
1471: sshkey_cert_type(const struct sshkey *k)
1472: {
1473: switch (k->cert->type) {
1474: case SSH2_CERT_TYPE_USER:
1475: return "user";
1476: case SSH2_CERT_TYPE_HOST:
1477: return "host";
1478: default:
1479: return "unknown";
1480: }
1481: }
1482:
1483: #ifdef WITH_OPENSSL
1484: static int
1485: rsa_generate_private_key(u_int bits, RSA **rsap)
1486: {
1487: RSA *private = NULL;
1488: BIGNUM *f4 = NULL;
1489: int ret = SSH_ERR_INTERNAL_ERROR;
1490:
1491: if (rsap == NULL ||
1492: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1493: bits > SSHBUF_MAX_BIGNUM * 8)
1494: return SSH_ERR_INVALID_ARGUMENT;
1495: *rsap = NULL;
1496: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1497: ret = SSH_ERR_ALLOC_FAIL;
1498: goto out;
1499: }
1500: if (!BN_set_word(f4, RSA_F4) ||
1501: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1502: ret = SSH_ERR_LIBCRYPTO_ERROR;
1503: goto out;
1504: }
1505: *rsap = private;
1506: private = NULL;
1507: ret = 0;
1508: out:
1509: if (private != NULL)
1510: RSA_free(private);
1511: if (f4 != NULL)
1512: BN_free(f4);
1513: return ret;
1514: }
1515:
1516: static int
1517: dsa_generate_private_key(u_int bits, DSA **dsap)
1518: {
1519: DSA *private;
1520: int ret = SSH_ERR_INTERNAL_ERROR;
1521:
1522: if (dsap == NULL || bits != 1024)
1523: return SSH_ERR_INVALID_ARGUMENT;
1524: if ((private = DSA_new()) == NULL) {
1525: ret = SSH_ERR_ALLOC_FAIL;
1526: goto out;
1527: }
1528: *dsap = NULL;
1529: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1530: NULL, NULL) || !DSA_generate_key(private)) {
1531: DSA_free(private);
1532: ret = SSH_ERR_LIBCRYPTO_ERROR;
1533: goto out;
1534: }
1535: *dsap = private;
1536: private = NULL;
1537: ret = 0;
1538: out:
1539: if (private != NULL)
1540: DSA_free(private);
1541: return ret;
1542: }
1543:
1544: int
1545: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1546: {
1547: EC_GROUP *eg;
1548: int nids[] = {
1549: NID_X9_62_prime256v1,
1550: NID_secp384r1,
1551: NID_secp521r1,
1552: -1
1553: };
1554: int nid;
1555: u_int i;
1556: BN_CTX *bnctx;
1557: const EC_GROUP *g = EC_KEY_get0_group(k);
1558:
1559: /*
1560: * The group may be stored in a ASN.1 encoded private key in one of two
1561: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1562: * or explicit group parameters encoded into the key blob. Only the
1563: * "named group" case sets the group NID for us, but we can figure
1564: * it out for the other case by comparing against all the groups that
1565: * are supported.
1566: */
1567: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1568: return nid;
1569: if ((bnctx = BN_CTX_new()) == NULL)
1570: return -1;
1571: for (i = 0; nids[i] != -1; i++) {
1572: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1573: BN_CTX_free(bnctx);
1574: return -1;
1575: }
1576: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1577: break;
1578: EC_GROUP_free(eg);
1579: }
1580: BN_CTX_free(bnctx);
1581: if (nids[i] != -1) {
1582: /* Use the group with the NID attached */
1583: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1584: if (EC_KEY_set_group(k, eg) != 1) {
1585: EC_GROUP_free(eg);
1586: return -1;
1587: }
1588: }
1589: return nids[i];
1590: }
1591:
1592: static int
1593: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1594: {
1595: EC_KEY *private;
1596: int ret = SSH_ERR_INTERNAL_ERROR;
1597:
1598: if (nid == NULL || ecdsap == NULL ||
1599: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1600: return SSH_ERR_INVALID_ARGUMENT;
1601: *ecdsap = NULL;
1602: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1603: ret = SSH_ERR_ALLOC_FAIL;
1604: goto out;
1605: }
1606: if (EC_KEY_generate_key(private) != 1) {
1607: ret = SSH_ERR_LIBCRYPTO_ERROR;
1608: goto out;
1609: }
1610: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1611: *ecdsap = private;
1612: private = NULL;
1613: ret = 0;
1614: out:
1615: if (private != NULL)
1616: EC_KEY_free(private);
1617: return ret;
1618: }
1619: #endif /* WITH_OPENSSL */
1620:
1621: int
1622: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1623: {
1624: struct sshkey *k;
1625: int ret = SSH_ERR_INTERNAL_ERROR;
1626:
1627: if (keyp == NULL)
1628: return SSH_ERR_INVALID_ARGUMENT;
1629: *keyp = NULL;
1630: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1631: return SSH_ERR_ALLOC_FAIL;
1632: switch (type) {
1633: case KEY_ED25519:
1634: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1635: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1636: ret = SSH_ERR_ALLOC_FAIL;
1637: break;
1638: }
1639: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1640: ret = 0;
1641: break;
1642: #ifdef WITH_OPENSSL
1643: case KEY_DSA:
1644: ret = dsa_generate_private_key(bits, &k->dsa);
1645: break;
1646: case KEY_ECDSA:
1647: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1648: &k->ecdsa);
1649: break;
1650: case KEY_RSA:
1651: case KEY_RSA1:
1652: ret = rsa_generate_private_key(bits, &k->rsa);
1653: break;
1654: #endif /* WITH_OPENSSL */
1655: default:
1656: ret = SSH_ERR_INVALID_ARGUMENT;
1657: }
1658: if (ret == 0) {
1659: k->type = type;
1660: *keyp = k;
1661: } else
1662: sshkey_free(k);
1663: return ret;
1664: }
1665:
1666: int
1667: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1668: {
1669: u_int i;
1670: const struct sshkey_cert *from;
1671: struct sshkey_cert *to;
1672: int ret = SSH_ERR_INTERNAL_ERROR;
1673:
1674: if (to_key->cert != NULL) {
1675: cert_free(to_key->cert);
1676: to_key->cert = NULL;
1677: }
1678:
1679: if ((from = from_key->cert) == NULL)
1680: return SSH_ERR_INVALID_ARGUMENT;
1681:
1682: if ((to = to_key->cert = cert_new()) == NULL)
1683: return SSH_ERR_ALLOC_FAIL;
1684:
1685: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1686: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1687: (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1688: return ret;
1689:
1690: to->serial = from->serial;
1691: to->type = from->type;
1692: if (from->key_id == NULL)
1693: to->key_id = NULL;
1694: else if ((to->key_id = strdup(from->key_id)) == NULL)
1695: return SSH_ERR_ALLOC_FAIL;
1696: to->valid_after = from->valid_after;
1697: to->valid_before = from->valid_before;
1698: if (from->signature_key == NULL)
1699: to->signature_key = NULL;
1700: else if ((ret = sshkey_from_private(from->signature_key,
1701: &to->signature_key)) != 0)
1702: return ret;
1703:
1704: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1705: return SSH_ERR_INVALID_ARGUMENT;
1706: if (from->nprincipals > 0) {
1707: if ((to->principals = calloc(from->nprincipals,
1708: sizeof(*to->principals))) == NULL)
1709: return SSH_ERR_ALLOC_FAIL;
1710: for (i = 0; i < from->nprincipals; i++) {
1711: to->principals[i] = strdup(from->principals[i]);
1712: if (to->principals[i] == NULL) {
1713: to->nprincipals = i;
1714: return SSH_ERR_ALLOC_FAIL;
1715: }
1716: }
1717: }
1718: to->nprincipals = from->nprincipals;
1719: return 0;
1720: }
1721:
1722: int
1723: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1724: {
1725: struct sshkey *n = NULL;
1726: int ret = SSH_ERR_INTERNAL_ERROR;
1727:
1728: if (pkp != NULL)
1729: *pkp = NULL;
1730:
1731: switch (k->type) {
1732: #ifdef WITH_OPENSSL
1733: case KEY_DSA:
1734: case KEY_DSA_CERT:
1735: if ((n = sshkey_new(k->type)) == NULL)
1736: return SSH_ERR_ALLOC_FAIL;
1737: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1738: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1739: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1740: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1741: sshkey_free(n);
1742: return SSH_ERR_ALLOC_FAIL;
1743: }
1744: break;
1745: case KEY_ECDSA:
1746: case KEY_ECDSA_CERT:
1747: if ((n = sshkey_new(k->type)) == NULL)
1748: return SSH_ERR_ALLOC_FAIL;
1749: n->ecdsa_nid = k->ecdsa_nid;
1750: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1751: if (n->ecdsa == NULL) {
1752: sshkey_free(n);
1753: return SSH_ERR_ALLOC_FAIL;
1754: }
1755: if (EC_KEY_set_public_key(n->ecdsa,
1756: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1757: sshkey_free(n);
1758: return SSH_ERR_LIBCRYPTO_ERROR;
1759: }
1760: break;
1761: case KEY_RSA:
1762: case KEY_RSA1:
1763: case KEY_RSA_CERT:
1764: if ((n = sshkey_new(k->type)) == NULL)
1765: return SSH_ERR_ALLOC_FAIL;
1766: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1767: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1768: sshkey_free(n);
1769: return SSH_ERR_ALLOC_FAIL;
1770: }
1771: break;
1772: #endif /* WITH_OPENSSL */
1773: case KEY_ED25519:
1774: case KEY_ED25519_CERT:
1775: if ((n = sshkey_new(k->type)) == NULL)
1776: return SSH_ERR_ALLOC_FAIL;
1777: if (k->ed25519_pk != NULL) {
1778: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1779: sshkey_free(n);
1780: return SSH_ERR_ALLOC_FAIL;
1781: }
1782: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1783: }
1784: break;
1785: default:
1786: return SSH_ERR_KEY_TYPE_UNKNOWN;
1787: }
1788: if (sshkey_is_cert(k)) {
1789: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1790: sshkey_free(n);
1791: return ret;
1792: }
1793: }
1794: *pkp = n;
1795: return 0;
1796: }
1797:
1798: static int
1.14 djm 1799: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1800: {
1.14 djm 1801: struct sshbuf *principals = NULL, *crit = NULL;
1802: struct sshbuf *exts = NULL, *ca = NULL;
1803: u_char *sig = NULL;
1804: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1805: int ret = SSH_ERR_INTERNAL_ERROR;
1806:
1807: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1808: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1809: return ret;
1810:
1.20 ! djm 1811: /* Parse body of certificate up to signature */
! 1812: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1813: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1814: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1815: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1816: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1817: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1818: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 ! djm 1819: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1820: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1821: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1822: /* XXX debug print error for ret */
1823: ret = SSH_ERR_INVALID_FORMAT;
1824: goto out;
1825: }
1826:
1827: /* Signature is left in the buffer so we can calculate this length */
1828: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1829:
1830: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1831: ret = SSH_ERR_INVALID_FORMAT;
1832: goto out;
1833: }
1834:
1835: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1836: key->cert->type != SSH2_CERT_TYPE_HOST) {
1837: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1838: goto out;
1839: }
1840:
1.4 djm 1841: /* Parse principals section */
1842: while (sshbuf_len(principals) > 0) {
1843: char *principal = NULL;
1844: char **oprincipals = NULL;
1845:
1.1 djm 1846: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1847: ret = SSH_ERR_INVALID_FORMAT;
1848: goto out;
1849: }
1.4 djm 1850: if ((ret = sshbuf_get_cstring(principals, &principal,
1851: NULL)) != 0) {
1.1 djm 1852: ret = SSH_ERR_INVALID_FORMAT;
1853: goto out;
1854: }
1855: oprincipals = key->cert->principals;
1.20 ! djm 1856: key->cert->principals = reallocarray(key->cert->principals,
! 1857: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1.1 djm 1858: if (key->cert->principals == NULL) {
1859: free(principal);
1860: key->cert->principals = oprincipals;
1861: ret = SSH_ERR_ALLOC_FAIL;
1862: goto out;
1863: }
1864: key->cert->principals[key->cert->nprincipals++] = principal;
1865: }
1866:
1.4 djm 1867: /*
1868: * Stash a copies of the critical options and extensions sections
1869: * for later use.
1870: */
1871: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1872: (exts != NULL &&
1873: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1874: goto out;
1875:
1.4 djm 1876: /*
1877: * Validate critical options and extensions sections format.
1878: */
1879: while (sshbuf_len(crit) != 0) {
1880: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1881: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1882: sshbuf_reset(key->cert->critical);
1.1 djm 1883: ret = SSH_ERR_INVALID_FORMAT;
1884: goto out;
1885: }
1886: }
1.4 djm 1887: while (exts != NULL && sshbuf_len(exts) != 0) {
1888: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1889: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1890: sshbuf_reset(key->cert->extensions);
1.1 djm 1891: ret = SSH_ERR_INVALID_FORMAT;
1892: goto out;
1893: }
1894: }
1895:
1.4 djm 1896: /* Parse CA key and check signature */
1.14 djm 1897: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1898: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1899: goto out;
1900: }
1901: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1902: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1903: goto out;
1904: }
1905: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1906: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1907: goto out;
1.4 djm 1908:
1909: /* Success */
1.1 djm 1910: ret = 0;
1911: out:
1.14 djm 1912: sshbuf_free(ca);
1.4 djm 1913: sshbuf_free(crit);
1914: sshbuf_free(exts);
1915: sshbuf_free(principals);
1.1 djm 1916: free(sig);
1917: return ret;
1918: }
1919:
1920: static int
1.14 djm 1921: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1922: int allow_cert)
1.1 djm 1923: {
1.12 djm 1924: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1925: char *ktype = NULL, *curve = NULL;
1926: struct sshkey *key = NULL;
1927: size_t len;
1928: u_char *pk = NULL;
1.14 djm 1929: struct sshbuf *copy;
1.1 djm 1930: #ifdef WITH_OPENSSL
1931: EC_POINT *q = NULL;
1932: #endif /* WITH_OPENSSL */
1933:
1934: #ifdef DEBUG_PK /* XXX */
1.14 djm 1935: sshbuf_dump(b, stderr);
1.1 djm 1936: #endif
1937: *keyp = NULL;
1.14 djm 1938: if ((copy = sshbuf_fromb(b)) == NULL) {
1939: ret = SSH_ERR_ALLOC_FAIL;
1940: goto out;
1941: }
1.1 djm 1942: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1943: ret = SSH_ERR_INVALID_FORMAT;
1944: goto out;
1945: }
1946:
1947: type = sshkey_type_from_name(ktype);
1948: if (!allow_cert && sshkey_type_is_cert(type)) {
1949: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1950: goto out;
1951: }
1952: switch (type) {
1953: #ifdef WITH_OPENSSL
1954: case KEY_RSA_CERT:
1.14 djm 1955: /* Skip nonce */
1.1 djm 1956: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1957: ret = SSH_ERR_INVALID_FORMAT;
1958: goto out;
1959: }
1960: /* FALLTHROUGH */
1961: case KEY_RSA:
1962: if ((key = sshkey_new(type)) == NULL) {
1963: ret = SSH_ERR_ALLOC_FAIL;
1964: goto out;
1965: }
1.16 djm 1966: if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
1967: sshbuf_get_bignum2(b, key->rsa->n) != 0) {
1.1 djm 1968: ret = SSH_ERR_INVALID_FORMAT;
1969: goto out;
1970: }
1971: #ifdef DEBUG_PK
1972: RSA_print_fp(stderr, key->rsa, 8);
1973: #endif
1974: break;
1975: case KEY_DSA_CERT:
1.14 djm 1976: /* Skip nonce */
1.1 djm 1977: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1978: ret = SSH_ERR_INVALID_FORMAT;
1979: goto out;
1980: }
1981: /* FALLTHROUGH */
1982: case KEY_DSA:
1983: if ((key = sshkey_new(type)) == NULL) {
1984: ret = SSH_ERR_ALLOC_FAIL;
1985: goto out;
1986: }
1.16 djm 1987: if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
1988: sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
1989: sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
1990: sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
1.1 djm 1991: ret = SSH_ERR_INVALID_FORMAT;
1992: goto out;
1993: }
1994: #ifdef DEBUG_PK
1995: DSA_print_fp(stderr, key->dsa, 8);
1996: #endif
1997: break;
1998: case KEY_ECDSA_CERT:
1.14 djm 1999: /* Skip nonce */
1.1 djm 2000: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2001: ret = SSH_ERR_INVALID_FORMAT;
2002: goto out;
2003: }
2004: /* FALLTHROUGH */
2005: case KEY_ECDSA:
2006: if ((key = sshkey_new(type)) == NULL) {
2007: ret = SSH_ERR_ALLOC_FAIL;
2008: goto out;
2009: }
1.12 djm 2010: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2011: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2012: ret = SSH_ERR_INVALID_FORMAT;
2013: goto out;
2014: }
2015: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2016: ret = SSH_ERR_EC_CURVE_MISMATCH;
2017: goto out;
2018: }
2019: if (key->ecdsa != NULL)
2020: EC_KEY_free(key->ecdsa);
2021: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2022: == NULL) {
2023: ret = SSH_ERR_EC_CURVE_INVALID;
2024: goto out;
2025: }
2026: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2027: ret = SSH_ERR_ALLOC_FAIL;
2028: goto out;
2029: }
2030: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2031: ret = SSH_ERR_INVALID_FORMAT;
2032: goto out;
2033: }
2034: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2035: q) != 0) {
2036: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2037: goto out;
2038: }
2039: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2040: /* XXX assume it is a allocation error */
2041: ret = SSH_ERR_ALLOC_FAIL;
2042: goto out;
2043: }
2044: #ifdef DEBUG_PK
2045: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2046: #endif
2047: break;
2048: #endif /* WITH_OPENSSL */
2049: case KEY_ED25519_CERT:
1.14 djm 2050: /* Skip nonce */
1.1 djm 2051: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2052: ret = SSH_ERR_INVALID_FORMAT;
2053: goto out;
2054: }
2055: /* FALLTHROUGH */
2056: case KEY_ED25519:
2057: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2058: goto out;
2059: if (len != ED25519_PK_SZ) {
2060: ret = SSH_ERR_INVALID_FORMAT;
2061: goto out;
2062: }
2063: if ((key = sshkey_new(type)) == NULL) {
2064: ret = SSH_ERR_ALLOC_FAIL;
2065: goto out;
2066: }
2067: key->ed25519_pk = pk;
2068: pk = NULL;
2069: break;
2070: case KEY_UNSPEC:
2071: if ((key = sshkey_new(type)) == NULL) {
2072: ret = SSH_ERR_ALLOC_FAIL;
2073: goto out;
2074: }
2075: break;
2076: default:
2077: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2078: goto out;
2079: }
2080:
2081: /* Parse certificate potion */
1.14 djm 2082: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2083: goto out;
2084:
2085: if (key != NULL && sshbuf_len(b) != 0) {
2086: ret = SSH_ERR_INVALID_FORMAT;
2087: goto out;
2088: }
2089: ret = 0;
2090: *keyp = key;
2091: key = NULL;
2092: out:
1.14 djm 2093: sshbuf_free(copy);
1.1 djm 2094: sshkey_free(key);
2095: free(ktype);
2096: free(curve);
2097: free(pk);
2098: #ifdef WITH_OPENSSL
2099: if (q != NULL)
2100: EC_POINT_free(q);
2101: #endif /* WITH_OPENSSL */
2102: return ret;
2103: }
2104:
2105: int
2106: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2107: {
1.14 djm 2108: struct sshbuf *b;
2109: int r;
2110:
2111: if ((b = sshbuf_from(blob, blen)) == NULL)
2112: return SSH_ERR_ALLOC_FAIL;
2113: r = sshkey_from_blob_internal(b, keyp, 1);
2114: sshbuf_free(b);
2115: return r;
2116: }
2117:
2118: int
2119: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2120: {
2121: return sshkey_from_blob_internal(b, keyp, 1);
2122: }
2123:
2124: int
2125: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2126: {
2127: struct sshbuf *b;
2128: int r;
2129:
2130: if ((r = sshbuf_froms(buf, &b)) != 0)
2131: return r;
2132: r = sshkey_from_blob_internal(b, keyp, 1);
2133: sshbuf_free(b);
2134: return r;
1.1 djm 2135: }
2136:
2137: int
2138: sshkey_sign(const struct sshkey *key,
2139: u_char **sigp, size_t *lenp,
2140: const u_char *data, size_t datalen, u_int compat)
2141: {
2142: if (sigp != NULL)
2143: *sigp = NULL;
2144: if (lenp != NULL)
2145: *lenp = 0;
2146: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2147: return SSH_ERR_INVALID_ARGUMENT;
2148: switch (key->type) {
2149: #ifdef WITH_OPENSSL
2150: case KEY_DSA_CERT:
2151: case KEY_DSA:
2152: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2153: case KEY_ECDSA_CERT:
2154: case KEY_ECDSA:
2155: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2156: case KEY_RSA_CERT:
2157: case KEY_RSA:
2158: return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2159: #endif /* WITH_OPENSSL */
2160: case KEY_ED25519:
2161: case KEY_ED25519_CERT:
2162: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2163: default:
2164: return SSH_ERR_KEY_TYPE_UNKNOWN;
2165: }
2166: }
2167:
2168: /*
2169: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2170: */
2171: int
2172: sshkey_verify(const struct sshkey *key,
2173: const u_char *sig, size_t siglen,
2174: const u_char *data, size_t dlen, u_int compat)
2175: {
1.6 djm 2176: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2177: return SSH_ERR_INVALID_ARGUMENT;
2178: switch (key->type) {
2179: #ifdef WITH_OPENSSL
2180: case KEY_DSA_CERT:
2181: case KEY_DSA:
2182: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2183: case KEY_ECDSA_CERT:
2184: case KEY_ECDSA:
2185: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2186: case KEY_RSA_CERT:
2187: case KEY_RSA:
2188: return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2189: #endif /* WITH_OPENSSL */
2190: case KEY_ED25519:
2191: case KEY_ED25519_CERT:
2192: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2193: default:
2194: return SSH_ERR_KEY_TYPE_UNKNOWN;
2195: }
2196: }
2197:
2198: /* Converts a private to a public key */
2199: int
2200: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2201: {
2202: struct sshkey *pk;
2203: int ret = SSH_ERR_INTERNAL_ERROR;
2204:
2205: if (dkp != NULL)
2206: *dkp = NULL;
2207:
2208: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2209: return SSH_ERR_ALLOC_FAIL;
2210: pk->type = k->type;
2211: pk->flags = k->flags;
2212: pk->ecdsa_nid = k->ecdsa_nid;
2213: pk->dsa = NULL;
2214: pk->ecdsa = NULL;
2215: pk->rsa = NULL;
2216: pk->ed25519_pk = NULL;
2217: pk->ed25519_sk = NULL;
2218:
2219: switch (k->type) {
2220: #ifdef WITH_OPENSSL
2221: case KEY_RSA_CERT:
2222: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2223: goto fail;
2224: /* FALLTHROUGH */
2225: case KEY_RSA1:
2226: case KEY_RSA:
2227: if ((pk->rsa = RSA_new()) == NULL ||
2228: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2229: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2230: ret = SSH_ERR_ALLOC_FAIL;
2231: goto fail;
2232: }
2233: break;
2234: case KEY_DSA_CERT:
2235: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2236: goto fail;
2237: /* FALLTHROUGH */
2238: case KEY_DSA:
2239: if ((pk->dsa = DSA_new()) == NULL ||
2240: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2241: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2242: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2243: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2244: ret = SSH_ERR_ALLOC_FAIL;
2245: goto fail;
2246: }
2247: break;
2248: case KEY_ECDSA_CERT:
2249: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2250: goto fail;
2251: /* FALLTHROUGH */
2252: case KEY_ECDSA:
2253: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2254: if (pk->ecdsa == NULL) {
2255: ret = SSH_ERR_ALLOC_FAIL;
2256: goto fail;
2257: }
2258: if (EC_KEY_set_public_key(pk->ecdsa,
2259: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2260: ret = SSH_ERR_LIBCRYPTO_ERROR;
2261: goto fail;
2262: }
2263: break;
2264: #endif /* WITH_OPENSSL */
2265: case KEY_ED25519_CERT:
2266: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2267: goto fail;
2268: /* FALLTHROUGH */
2269: case KEY_ED25519:
2270: if (k->ed25519_pk != NULL) {
2271: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2272: ret = SSH_ERR_ALLOC_FAIL;
2273: goto fail;
2274: }
2275: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2276: }
2277: break;
2278: default:
2279: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2280: fail:
2281: sshkey_free(pk);
2282: return ret;
2283: }
2284: *dkp = pk;
2285: return 0;
2286: }
2287:
2288: /* Convert a plain key to their _CERT equivalent */
2289: int
1.20 ! djm 2290: sshkey_to_certified(struct sshkey *k)
1.1 djm 2291: {
2292: int newtype;
2293:
2294: switch (k->type) {
2295: #ifdef WITH_OPENSSL
2296: case KEY_RSA:
1.20 ! djm 2297: newtype = KEY_RSA_CERT;
1.1 djm 2298: break;
2299: case KEY_DSA:
1.20 ! djm 2300: newtype = KEY_DSA_CERT;
1.1 djm 2301: break;
2302: case KEY_ECDSA:
2303: newtype = KEY_ECDSA_CERT;
2304: break;
2305: #endif /* WITH_OPENSSL */
2306: case KEY_ED25519:
2307: newtype = KEY_ED25519_CERT;
2308: break;
2309: default:
2310: return SSH_ERR_INVALID_ARGUMENT;
2311: }
2312: if ((k->cert = cert_new()) == NULL)
2313: return SSH_ERR_ALLOC_FAIL;
2314: k->type = newtype;
2315: return 0;
2316: }
2317:
2318: /* Convert a certificate to its raw key equivalent */
2319: int
2320: sshkey_drop_cert(struct sshkey *k)
2321: {
2322: if (!sshkey_type_is_cert(k->type))
2323: return SSH_ERR_KEY_TYPE_UNKNOWN;
2324: cert_free(k->cert);
2325: k->cert = NULL;
2326: k->type = sshkey_type_plain(k->type);
2327: return 0;
2328: }
2329:
2330: /* Sign a certified key, (re-)generating the signed certblob. */
2331: int
2332: sshkey_certify(struct sshkey *k, struct sshkey *ca)
2333: {
2334: struct sshbuf *principals = NULL;
2335: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2336: size_t i, ca_len, sig_len;
2337: int ret = SSH_ERR_INTERNAL_ERROR;
2338: struct sshbuf *cert;
2339:
2340: if (k == NULL || k->cert == NULL ||
2341: k->cert->certblob == NULL || ca == NULL)
2342: return SSH_ERR_INVALID_ARGUMENT;
2343: if (!sshkey_is_cert(k))
2344: return SSH_ERR_KEY_TYPE_UNKNOWN;
2345: if (!sshkey_type_is_valid_ca(ca->type))
2346: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2347:
2348: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2349: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2350:
2351: cert = k->cert->certblob; /* for readability */
2352: sshbuf_reset(cert);
2353: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2354: goto out;
2355:
2356: /* -v01 certs put nonce first */
2357: arc4random_buf(&nonce, sizeof(nonce));
1.20 ! djm 2358: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
! 2359: goto out;
1.1 djm 2360:
2361: /* XXX this substantially duplicates to_blob(); refactor */
2362: switch (k->type) {
2363: #ifdef WITH_OPENSSL
2364: case KEY_DSA_CERT:
2365: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2366: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2367: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2368: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2369: goto out;
2370: break;
2371: case KEY_ECDSA_CERT:
2372: if ((ret = sshbuf_put_cstring(cert,
2373: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2374: (ret = sshbuf_put_ec(cert,
2375: EC_KEY_get0_public_key(k->ecdsa),
2376: EC_KEY_get0_group(k->ecdsa))) != 0)
2377: goto out;
2378: break;
2379: case KEY_RSA_CERT:
2380: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2381: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2382: goto out;
2383: break;
2384: #endif /* WITH_OPENSSL */
2385: case KEY_ED25519_CERT:
2386: if ((ret = sshbuf_put_string(cert,
2387: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2388: goto out;
2389: break;
2390: default:
2391: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2392: goto out;
1.1 djm 2393: }
2394:
1.20 ! djm 2395: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
! 2396: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2397: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2398: goto out;
2399:
2400: if ((principals = sshbuf_new()) == NULL) {
2401: ret = SSH_ERR_ALLOC_FAIL;
2402: goto out;
2403: }
2404: for (i = 0; i < k->cert->nprincipals; i++) {
2405: if ((ret = sshbuf_put_cstring(principals,
2406: k->cert->principals[i])) != 0)
2407: goto out;
2408: }
2409: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2410: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2411: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 ! djm 2412: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
! 2413: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
! 2414: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2415: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2416: goto out;
2417:
2418: /* Sign the whole mess */
2419: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2420: sshbuf_len(cert), 0)) != 0)
2421: goto out;
2422:
2423: /* Append signature and we are done */
2424: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2425: goto out;
2426: ret = 0;
2427: out:
2428: if (ret != 0)
2429: sshbuf_reset(cert);
2430: if (sig_blob != NULL)
2431: free(sig_blob);
2432: if (ca_blob != NULL)
2433: free(ca_blob);
2434: if (principals != NULL)
2435: sshbuf_free(principals);
2436: return ret;
2437: }
2438:
2439: int
2440: sshkey_cert_check_authority(const struct sshkey *k,
2441: int want_host, int require_principal,
2442: const char *name, const char **reason)
2443: {
2444: u_int i, principal_matches;
2445: time_t now = time(NULL);
2446:
2447: if (reason != NULL)
2448: *reason = NULL;
2449:
2450: if (want_host) {
2451: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2452: *reason = "Certificate invalid: not a host certificate";
2453: return SSH_ERR_KEY_CERT_INVALID;
2454: }
2455: } else {
2456: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2457: *reason = "Certificate invalid: not a user certificate";
2458: return SSH_ERR_KEY_CERT_INVALID;
2459: }
2460: }
2461: if (now < 0) {
2462: /* yikes - system clock before epoch! */
2463: *reason = "Certificate invalid: not yet valid";
2464: return SSH_ERR_KEY_CERT_INVALID;
2465: }
2466: if ((u_int64_t)now < k->cert->valid_after) {
2467: *reason = "Certificate invalid: not yet valid";
2468: return SSH_ERR_KEY_CERT_INVALID;
2469: }
2470: if ((u_int64_t)now >= k->cert->valid_before) {
2471: *reason = "Certificate invalid: expired";
2472: return SSH_ERR_KEY_CERT_INVALID;
2473: }
2474: if (k->cert->nprincipals == 0) {
2475: if (require_principal) {
2476: *reason = "Certificate lacks principal list";
2477: return SSH_ERR_KEY_CERT_INVALID;
2478: }
2479: } else if (name != NULL) {
2480: principal_matches = 0;
2481: for (i = 0; i < k->cert->nprincipals; i++) {
2482: if (strcmp(name, k->cert->principals[i]) == 0) {
2483: principal_matches = 1;
2484: break;
2485: }
2486: }
2487: if (!principal_matches) {
2488: *reason = "Certificate invalid: name is not a listed "
2489: "principal";
2490: return SSH_ERR_KEY_CERT_INVALID;
2491: }
2492: }
2493: return 0;
2494: }
2495:
2496: int
2497: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2498: {
2499: int r = SSH_ERR_INTERNAL_ERROR;
2500:
2501: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2502: goto out;
2503: switch (key->type) {
2504: #ifdef WITH_OPENSSL
2505: case KEY_RSA:
2506: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2507: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2508: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2509: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2510: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2511: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2512: goto out;
2513: break;
2514: case KEY_RSA_CERT:
2515: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2516: r = SSH_ERR_INVALID_ARGUMENT;
2517: goto out;
2518: }
2519: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2520: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2521: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2522: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2523: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2524: goto out;
2525: break;
2526: case KEY_DSA:
2527: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2528: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2529: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2530: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2531: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2532: goto out;
2533: break;
2534: case KEY_DSA_CERT:
2535: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2536: r = SSH_ERR_INVALID_ARGUMENT;
2537: goto out;
2538: }
2539: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2540: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2541: goto out;
2542: break;
2543: case KEY_ECDSA:
2544: if ((r = sshbuf_put_cstring(b,
2545: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2546: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2547: (r = sshbuf_put_bignum2(b,
2548: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2549: goto out;
2550: break;
2551: case KEY_ECDSA_CERT:
2552: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2553: r = SSH_ERR_INVALID_ARGUMENT;
2554: goto out;
2555: }
2556: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2557: (r = sshbuf_put_bignum2(b,
2558: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2559: goto out;
2560: break;
2561: #endif /* WITH_OPENSSL */
2562: case KEY_ED25519:
2563: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2564: ED25519_PK_SZ)) != 0 ||
2565: (r = sshbuf_put_string(b, key->ed25519_sk,
2566: ED25519_SK_SZ)) != 0)
2567: goto out;
2568: break;
2569: case KEY_ED25519_CERT:
2570: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2571: r = SSH_ERR_INVALID_ARGUMENT;
2572: goto out;
2573: }
2574: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2575: (r = sshbuf_put_string(b, key->ed25519_pk,
2576: ED25519_PK_SZ)) != 0 ||
2577: (r = sshbuf_put_string(b, key->ed25519_sk,
2578: ED25519_SK_SZ)) != 0)
2579: goto out;
2580: break;
2581: default:
2582: r = SSH_ERR_INVALID_ARGUMENT;
2583: goto out;
2584: }
2585: /* success */
2586: r = 0;
2587: out:
2588: return r;
2589: }
2590:
2591: int
2592: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2593: {
2594: char *tname = NULL, *curve = NULL;
2595: struct sshkey *k = NULL;
1.14 djm 2596: size_t pklen = 0, sklen = 0;
1.1 djm 2597: int type, r = SSH_ERR_INTERNAL_ERROR;
2598: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2599: #ifdef WITH_OPENSSL
2600: BIGNUM *exponent = NULL;
2601: #endif /* WITH_OPENSSL */
2602:
2603: if (kp != NULL)
2604: *kp = NULL;
2605: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2606: goto out;
2607: type = sshkey_type_from_name(tname);
2608: switch (type) {
2609: #ifdef WITH_OPENSSL
2610: case KEY_DSA:
2611: if ((k = sshkey_new_private(type)) == NULL) {
2612: r = SSH_ERR_ALLOC_FAIL;
2613: goto out;
2614: }
2615: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2616: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2617: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2618: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2619: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2620: goto out;
2621: break;
2622: case KEY_DSA_CERT:
1.14 djm 2623: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2624: (r = sshkey_add_private(k)) != 0 ||
2625: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2626: goto out;
2627: break;
2628: case KEY_ECDSA:
2629: if ((k = sshkey_new_private(type)) == NULL) {
2630: r = SSH_ERR_ALLOC_FAIL;
2631: goto out;
2632: }
2633: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2634: r = SSH_ERR_INVALID_ARGUMENT;
2635: goto out;
2636: }
2637: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2638: goto out;
2639: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2640: r = SSH_ERR_EC_CURVE_MISMATCH;
2641: goto out;
2642: }
2643: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2644: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2645: r = SSH_ERR_LIBCRYPTO_ERROR;
2646: goto out;
2647: }
2648: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2649: (r = sshbuf_get_bignum2(buf, exponent)))
2650: goto out;
2651: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2652: r = SSH_ERR_LIBCRYPTO_ERROR;
2653: goto out;
2654: }
2655: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2656: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2657: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2658: goto out;
2659: break;
2660: case KEY_ECDSA_CERT:
2661: if ((exponent = BN_new()) == NULL) {
2662: r = SSH_ERR_LIBCRYPTO_ERROR;
2663: goto out;
2664: }
1.14 djm 2665: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2666: (r = sshkey_add_private(k)) != 0 ||
2667: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2668: goto out;
2669: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2670: r = SSH_ERR_LIBCRYPTO_ERROR;
2671: goto out;
2672: }
2673: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2674: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2675: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2676: goto out;
2677: break;
2678: case KEY_RSA:
2679: if ((k = sshkey_new_private(type)) == NULL) {
2680: r = SSH_ERR_ALLOC_FAIL;
2681: goto out;
2682: }
2683: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2684: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2685: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2686: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2687: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2688: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2689: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2690: goto out;
2691: break;
2692: case KEY_RSA_CERT:
1.14 djm 2693: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2694: (r = sshkey_add_private(k)) != 0 ||
2695: (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2696: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2697: (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2698: (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2699: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2700: goto out;
2701: break;
2702: #endif /* WITH_OPENSSL */
2703: case KEY_ED25519:
2704: if ((k = sshkey_new_private(type)) == NULL) {
2705: r = SSH_ERR_ALLOC_FAIL;
2706: goto out;
2707: }
2708: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2709: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2710: goto out;
2711: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2712: r = SSH_ERR_INVALID_FORMAT;
2713: goto out;
2714: }
2715: k->ed25519_pk = ed25519_pk;
2716: k->ed25519_sk = ed25519_sk;
2717: ed25519_pk = ed25519_sk = NULL;
2718: break;
2719: case KEY_ED25519_CERT:
1.14 djm 2720: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2721: (r = sshkey_add_private(k)) != 0 ||
2722: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2723: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2724: goto out;
2725: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2726: r = SSH_ERR_INVALID_FORMAT;
2727: goto out;
2728: }
2729: k->ed25519_pk = ed25519_pk;
2730: k->ed25519_sk = ed25519_sk;
2731: ed25519_pk = ed25519_sk = NULL;
2732: break;
2733: default:
2734: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2735: goto out;
2736: }
2737: #ifdef WITH_OPENSSL
2738: /* enable blinding */
2739: switch (k->type) {
2740: case KEY_RSA:
2741: case KEY_RSA_CERT:
2742: case KEY_RSA1:
2743: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2744: r = SSH_ERR_LIBCRYPTO_ERROR;
2745: goto out;
2746: }
2747: break;
2748: }
2749: #endif /* WITH_OPENSSL */
2750: /* success */
2751: r = 0;
2752: if (kp != NULL) {
2753: *kp = k;
2754: k = NULL;
2755: }
2756: out:
2757: free(tname);
2758: free(curve);
2759: #ifdef WITH_OPENSSL
2760: if (exponent != NULL)
2761: BN_clear_free(exponent);
2762: #endif /* WITH_OPENSSL */
2763: sshkey_free(k);
2764: if (ed25519_pk != NULL) {
2765: explicit_bzero(ed25519_pk, pklen);
2766: free(ed25519_pk);
2767: }
2768: if (ed25519_sk != NULL) {
2769: explicit_bzero(ed25519_sk, sklen);
2770: free(ed25519_sk);
2771: }
2772: return r;
2773: }
2774:
2775: #ifdef WITH_OPENSSL
2776: int
2777: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2778: {
2779: BN_CTX *bnctx;
2780: EC_POINT *nq = NULL;
2781: BIGNUM *order, *x, *y, *tmp;
2782: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2783:
2784: if ((bnctx = BN_CTX_new()) == NULL)
2785: return SSH_ERR_ALLOC_FAIL;
2786: BN_CTX_start(bnctx);
2787:
2788: /*
2789: * We shouldn't ever hit this case because bignum_get_ecpoint()
2790: * refuses to load GF2m points.
2791: */
2792: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2793: NID_X9_62_prime_field)
2794: goto out;
2795:
2796: /* Q != infinity */
2797: if (EC_POINT_is_at_infinity(group, public))
2798: goto out;
2799:
2800: if ((x = BN_CTX_get(bnctx)) == NULL ||
2801: (y = BN_CTX_get(bnctx)) == NULL ||
2802: (order = BN_CTX_get(bnctx)) == NULL ||
2803: (tmp = BN_CTX_get(bnctx)) == NULL) {
2804: ret = SSH_ERR_ALLOC_FAIL;
2805: goto out;
2806: }
2807:
2808: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2809: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2810: EC_POINT_get_affine_coordinates_GFp(group, public,
2811: x, y, bnctx) != 1) {
2812: ret = SSH_ERR_LIBCRYPTO_ERROR;
2813: goto out;
2814: }
2815: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2816: BN_num_bits(y) <= BN_num_bits(order) / 2)
2817: goto out;
2818:
2819: /* nQ == infinity (n == order of subgroup) */
2820: if ((nq = EC_POINT_new(group)) == NULL) {
2821: ret = SSH_ERR_ALLOC_FAIL;
2822: goto out;
2823: }
2824: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2825: ret = SSH_ERR_LIBCRYPTO_ERROR;
2826: goto out;
2827: }
2828: if (EC_POINT_is_at_infinity(group, nq) != 1)
2829: goto out;
2830:
2831: /* x < order - 1, y < order - 1 */
2832: if (!BN_sub(tmp, order, BN_value_one())) {
2833: ret = SSH_ERR_LIBCRYPTO_ERROR;
2834: goto out;
2835: }
2836: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2837: goto out;
2838: ret = 0;
2839: out:
2840: BN_CTX_free(bnctx);
2841: if (nq != NULL)
2842: EC_POINT_free(nq);
2843: return ret;
2844: }
2845:
2846: int
2847: sshkey_ec_validate_private(const EC_KEY *key)
2848: {
2849: BN_CTX *bnctx;
2850: BIGNUM *order, *tmp;
2851: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2852:
2853: if ((bnctx = BN_CTX_new()) == NULL)
2854: return SSH_ERR_ALLOC_FAIL;
2855: BN_CTX_start(bnctx);
2856:
2857: if ((order = BN_CTX_get(bnctx)) == NULL ||
2858: (tmp = BN_CTX_get(bnctx)) == NULL) {
2859: ret = SSH_ERR_ALLOC_FAIL;
2860: goto out;
2861: }
2862:
2863: /* log2(private) > log2(order)/2 */
2864: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2865: ret = SSH_ERR_LIBCRYPTO_ERROR;
2866: goto out;
2867: }
2868: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2869: BN_num_bits(order) / 2)
2870: goto out;
2871:
2872: /* private < order - 1 */
2873: if (!BN_sub(tmp, order, BN_value_one())) {
2874: ret = SSH_ERR_LIBCRYPTO_ERROR;
2875: goto out;
2876: }
2877: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2878: goto out;
2879: ret = 0;
2880: out:
2881: BN_CTX_free(bnctx);
2882: return ret;
2883: }
2884:
2885: void
2886: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2887: {
2888: BIGNUM *x, *y;
2889: BN_CTX *bnctx;
2890:
2891: if (point == NULL) {
2892: fputs("point=(NULL)\n", stderr);
2893: return;
2894: }
2895: if ((bnctx = BN_CTX_new()) == NULL) {
2896: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2897: return;
2898: }
2899: BN_CTX_start(bnctx);
2900: if ((x = BN_CTX_get(bnctx)) == NULL ||
2901: (y = BN_CTX_get(bnctx)) == NULL) {
2902: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2903: return;
2904: }
2905: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2906: NID_X9_62_prime_field) {
2907: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2908: return;
2909: }
2910: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2911: bnctx) != 1) {
2912: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2913: __func__);
2914: return;
2915: }
2916: fputs("x=", stderr);
2917: BN_print_fp(stderr, x);
2918: fputs("\ny=", stderr);
2919: BN_print_fp(stderr, y);
2920: fputs("\n", stderr);
2921: BN_CTX_free(bnctx);
2922: }
2923:
2924: void
2925: sshkey_dump_ec_key(const EC_KEY *key)
2926: {
2927: const BIGNUM *exponent;
2928:
2929: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2930: EC_KEY_get0_public_key(key));
2931: fputs("exponent=", stderr);
2932: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2933: fputs("(NULL)", stderr);
2934: else
2935: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2936: fputs("\n", stderr);
2937: }
2938: #endif /* WITH_OPENSSL */
2939:
2940: static int
2941: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2942: const char *passphrase, const char *comment, const char *ciphername,
2943: int rounds)
2944: {
1.4 djm 2945: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2946: u_char salt[SALT_LEN];
1.4 djm 2947: char *b64 = NULL;
1.1 djm 2948: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2949: u_int check;
2950: int r = SSH_ERR_INTERNAL_ERROR;
2951: struct sshcipher_ctx ciphercontext;
2952: const struct sshcipher *cipher;
2953: const char *kdfname = KDFNAME;
2954: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2955:
2956: memset(&ciphercontext, 0, sizeof(ciphercontext));
2957:
2958: if (rounds <= 0)
2959: rounds = DEFAULT_ROUNDS;
2960: if (passphrase == NULL || !strlen(passphrase)) {
2961: ciphername = "none";
2962: kdfname = "none";
2963: } else if (ciphername == NULL)
2964: ciphername = DEFAULT_CIPHERNAME;
2965: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2966: r = SSH_ERR_INVALID_ARGUMENT;
2967: goto out;
2968: }
2969: if ((cipher = cipher_by_name(ciphername)) == NULL) {
2970: r = SSH_ERR_INTERNAL_ERROR;
2971: goto out;
2972: }
2973:
2974: if ((kdf = sshbuf_new()) == NULL ||
2975: (encoded = sshbuf_new()) == NULL ||
2976: (encrypted = sshbuf_new()) == NULL) {
2977: r = SSH_ERR_ALLOC_FAIL;
2978: goto out;
2979: }
2980: blocksize = cipher_blocksize(cipher);
2981: keylen = cipher_keylen(cipher);
2982: ivlen = cipher_ivlen(cipher);
2983: authlen = cipher_authlen(cipher);
2984: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2985: r = SSH_ERR_ALLOC_FAIL;
2986: goto out;
2987: }
2988: if (strcmp(kdfname, "bcrypt") == 0) {
2989: arc4random_buf(salt, SALT_LEN);
2990: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2991: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2992: r = SSH_ERR_INVALID_ARGUMENT;
2993: goto out;
2994: }
2995: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2996: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2997: goto out;
2998: } else if (strcmp(kdfname, "none") != 0) {
2999: /* Unsupported KDF type */
3000: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3001: goto out;
3002: }
3003: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3004: key + keylen, ivlen, 1)) != 0)
3005: goto out;
3006:
3007: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3008: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3009: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3010: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3011: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3012: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3013: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3014: goto out;
3015:
3016: /* set up the buffer that will be encrypted */
3017:
3018: /* Random check bytes */
3019: check = arc4random();
3020: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3021: (r = sshbuf_put_u32(encrypted, check)) != 0)
3022: goto out;
3023:
3024: /* append private key and comment*/
3025: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3026: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3027: goto out;
3028:
3029: /* padding */
3030: i = 0;
3031: while (sshbuf_len(encrypted) % blocksize) {
3032: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3033: goto out;
3034: }
3035:
3036: /* length in destination buffer */
3037: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3038: goto out;
3039:
3040: /* encrypt */
3041: if ((r = sshbuf_reserve(encoded,
3042: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3043: goto out;
3044: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3045: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3046: goto out;
3047:
3048: /* uuencode */
3049: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3050: r = SSH_ERR_ALLOC_FAIL;
3051: goto out;
3052: }
3053:
3054: sshbuf_reset(blob);
3055: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3056: goto out;
3057: for (i = 0; i < strlen(b64); i++) {
3058: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3059: goto out;
3060: /* insert line breaks */
3061: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3062: goto out;
3063: }
3064: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3065: goto out;
3066: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3067: goto out;
3068:
3069: /* success */
3070: r = 0;
3071:
3072: out:
3073: sshbuf_free(kdf);
3074: sshbuf_free(encoded);
3075: sshbuf_free(encrypted);
3076: cipher_cleanup(&ciphercontext);
3077: explicit_bzero(salt, sizeof(salt));
3078: if (key != NULL) {
3079: explicit_bzero(key, keylen + ivlen);
3080: free(key);
3081: }
3082: if (pubkeyblob != NULL) {
3083: explicit_bzero(pubkeyblob, pubkeylen);
3084: free(pubkeyblob);
3085: }
3086: if (b64 != NULL) {
3087: explicit_bzero(b64, strlen(b64));
3088: free(b64);
3089: }
3090: return r;
3091: }
3092:
3093: static int
3094: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3095: struct sshkey **keyp, char **commentp)
3096: {
3097: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3098: const struct sshcipher *cipher = NULL;
3099: const u_char *cp;
3100: int r = SSH_ERR_INTERNAL_ERROR;
3101: size_t encoded_len;
1.18 djm 3102: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3103: struct sshbuf *encoded = NULL, *decoded = NULL;
3104: struct sshbuf *kdf = NULL, *decrypted = NULL;
3105: struct sshcipher_ctx ciphercontext;
3106: struct sshkey *k = NULL;
3107: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3108: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3109:
3110: memset(&ciphercontext, 0, sizeof(ciphercontext));
3111: if (keyp != NULL)
3112: *keyp = NULL;
3113: if (commentp != NULL)
3114: *commentp = NULL;
3115:
3116: if ((encoded = sshbuf_new()) == NULL ||
3117: (decoded = sshbuf_new()) == NULL ||
3118: (decrypted = sshbuf_new()) == NULL) {
3119: r = SSH_ERR_ALLOC_FAIL;
3120: goto out;
3121: }
3122:
3123: /* check preamble */
3124: cp = sshbuf_ptr(blob);
3125: encoded_len = sshbuf_len(blob);
3126: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3127: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3128: r = SSH_ERR_INVALID_FORMAT;
3129: goto out;
3130: }
3131: cp += MARK_BEGIN_LEN;
3132: encoded_len -= MARK_BEGIN_LEN;
3133:
3134: /* Look for end marker, removing whitespace as we go */
3135: while (encoded_len > 0) {
3136: if (*cp != '\n' && *cp != '\r') {
3137: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3138: goto out;
3139: }
3140: last = *cp;
3141: encoded_len--;
3142: cp++;
3143: if (last == '\n') {
3144: if (encoded_len >= MARK_END_LEN &&
3145: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3146: /* \0 terminate */
3147: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3148: goto out;
3149: break;
3150: }
3151: }
3152: }
3153: if (encoded_len == 0) {
3154: r = SSH_ERR_INVALID_FORMAT;
3155: goto out;
3156: }
3157:
3158: /* decode base64 */
1.4 djm 3159: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3160: goto out;
3161:
3162: /* check magic */
3163: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3164: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3165: r = SSH_ERR_INVALID_FORMAT;
3166: goto out;
3167: }
3168: /* parse public portion of key */
3169: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3170: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3171: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3172: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3173: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3174: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3175: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3176: goto out;
3177:
3178: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3179: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3180: goto out;
3181: }
3182: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3183: strcmp(ciphername, "none") != 0) {
3184: /* passphrase required */
3185: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3186: goto out;
3187: }
3188: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3189: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3190: goto out;
3191: }
3192: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3193: r = SSH_ERR_INVALID_FORMAT;
3194: goto out;
3195: }
3196: if (nkeys != 1) {
3197: /* XXX only one key supported */
3198: r = SSH_ERR_INVALID_FORMAT;
3199: goto out;
3200: }
3201:
3202: /* check size of encrypted key blob */
3203: blocksize = cipher_blocksize(cipher);
3204: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3205: r = SSH_ERR_INVALID_FORMAT;
3206: goto out;
3207: }
3208:
3209: /* setup key */
3210: keylen = cipher_keylen(cipher);
3211: ivlen = cipher_ivlen(cipher);
1.18 djm 3212: authlen = cipher_authlen(cipher);
1.1 djm 3213: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3214: r = SSH_ERR_ALLOC_FAIL;
3215: goto out;
3216: }
3217: if (strcmp(kdfname, "bcrypt") == 0) {
3218: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3219: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3220: goto out;
3221: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3222: key, keylen + ivlen, rounds) < 0) {
3223: r = SSH_ERR_INVALID_FORMAT;
3224: goto out;
3225: }
3226: }
3227:
1.18 djm 3228: /* check that an appropriate amount of auth data is present */
3229: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3230: r = SSH_ERR_INVALID_FORMAT;
3231: goto out;
3232: }
3233:
1.1 djm 3234: /* decrypt private portion of key */
3235: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3236: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3237: key + keylen, ivlen, 0)) != 0)
3238: goto out;
3239: if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3240: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3241: /* an integrity error here indicates an incorrect passphrase */
3242: if (r == SSH_ERR_MAC_INVALID)
3243: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3244: goto out;
3245: }
1.18 djm 3246: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3247: goto out;
3248: /* there should be no trailing data */
3249: if (sshbuf_len(decoded) != 0) {
3250: r = SSH_ERR_INVALID_FORMAT;
3251: goto out;
3252: }
3253:
3254: /* check check bytes */
3255: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3256: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3257: goto out;
3258: if (check1 != check2) {
3259: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3260: goto out;
3261: }
3262:
3263: /* Load the private key and comment */
3264: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3265: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3266: goto out;
3267:
3268: /* Check deterministic padding */
3269: i = 0;
3270: while (sshbuf_len(decrypted)) {
3271: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3272: goto out;
3273: if (pad != (++i & 0xff)) {
3274: r = SSH_ERR_INVALID_FORMAT;
3275: goto out;
3276: }
3277: }
3278:
3279: /* XXX decode pubkey and check against private */
3280:
3281: /* success */
3282: r = 0;
3283: if (keyp != NULL) {
3284: *keyp = k;
3285: k = NULL;
3286: }
3287: if (commentp != NULL) {
3288: *commentp = comment;
3289: comment = NULL;
3290: }
3291: out:
3292: pad = 0;
3293: cipher_cleanup(&ciphercontext);
3294: free(ciphername);
3295: free(kdfname);
3296: free(comment);
3297: if (salt != NULL) {
3298: explicit_bzero(salt, slen);
3299: free(salt);
3300: }
3301: if (key != NULL) {
3302: explicit_bzero(key, keylen + ivlen);
3303: free(key);
3304: }
3305: sshbuf_free(encoded);
3306: sshbuf_free(decoded);
3307: sshbuf_free(kdf);
3308: sshbuf_free(decrypted);
3309: sshkey_free(k);
3310: return r;
3311: }
3312:
3313: #if WITH_SSH1
3314: /*
3315: * Serialises the authentication (private) key to a blob, encrypting it with
3316: * passphrase. The identification of the blob (lowest 64 bits of n) will
3317: * precede the key to provide identification of the key without needing a
3318: * passphrase.
3319: */
3320: static int
3321: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3322: const char *passphrase, const char *comment)
3323: {
3324: struct sshbuf *buffer = NULL, *encrypted = NULL;
3325: u_char buf[8];
3326: int r, cipher_num;
3327: struct sshcipher_ctx ciphercontext;
3328: const struct sshcipher *cipher;
3329: u_char *cp;
3330:
3331: /*
3332: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3333: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3334: */
3335: cipher_num = (strcmp(passphrase, "") == 0) ?
3336: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3337: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3338: return SSH_ERR_INTERNAL_ERROR;
3339:
3340: /* This buffer is used to build the secret part of the private key. */
3341: if ((buffer = sshbuf_new()) == NULL)
3342: return SSH_ERR_ALLOC_FAIL;
3343:
3344: /* Put checkbytes for checking passphrase validity. */
3345: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3346: goto out;
3347: arc4random_buf(cp, 2);
3348: memcpy(cp + 2, cp, 2);
3349:
3350: /*
3351: * Store the private key (n and e will not be stored because they
3352: * will be stored in plain text, and storing them also in encrypted
3353: * format would just give known plaintext).
3354: * Note: q and p are stored in reverse order to SSL.
3355: */
3356: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3357: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3358: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3359: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3360: goto out;
3361:
3362: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3363: explicit_bzero(buf, 8);
3364: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3365: goto out;
3366:
3367: /* This buffer will be used to contain the data in the file. */
3368: if ((encrypted = sshbuf_new()) == NULL) {
3369: r = SSH_ERR_ALLOC_FAIL;
3370: goto out;
3371: }
3372:
3373: /* First store keyfile id string. */
3374: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3375: sizeof(LEGACY_BEGIN))) != 0)
3376: goto out;
3377:
3378: /* Store cipher type and "reserved" field. */
3379: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3380: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3381: goto out;
3382:
3383: /* Store public key. This will be in plain text. */
3384: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3385: (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3386: (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3387: (r = sshbuf_put_cstring(encrypted, comment) != 0))
3388: goto out;
3389:
3390: /* Allocate space for the private part of the key in the buffer. */
3391: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3392: goto out;
3393:
3394: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3395: CIPHER_ENCRYPT)) != 0)
3396: goto out;
3397: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3398: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3399: goto out;
3400: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3401: goto out;
3402:
3403: r = sshbuf_putb(blob, encrypted);
3404:
3405: out:
3406: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3407: explicit_bzero(buf, sizeof(buf));
3408: if (buffer != NULL)
3409: sshbuf_free(buffer);
3410: if (encrypted != NULL)
3411: sshbuf_free(encrypted);
3412:
3413: return r;
3414: }
3415: #endif /* WITH_SSH1 */
3416:
3417: #ifdef WITH_OPENSSL
3418: /* convert SSH v2 key in OpenSSL PEM format */
3419: static int
3420: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3421: const char *_passphrase, const char *comment)
3422: {
3423: int success, r;
3424: int blen, len = strlen(_passphrase);
3425: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3426: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3427: const u_char *bptr;
3428: BIO *bio = NULL;
3429:
3430: if (len > 0 && len <= 4)
3431: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3432: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3433: return SSH_ERR_ALLOC_FAIL;
3434:
3435: switch (key->type) {
3436: case KEY_DSA:
3437: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3438: cipher, passphrase, len, NULL, NULL);
3439: break;
3440: case KEY_ECDSA:
3441: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3442: cipher, passphrase, len, NULL, NULL);
3443: break;
3444: case KEY_RSA:
3445: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3446: cipher, passphrase, len, NULL, NULL);
3447: break;
3448: default:
3449: success = 0;
3450: break;
3451: }
3452: if (success == 0) {
3453: r = SSH_ERR_LIBCRYPTO_ERROR;
3454: goto out;
3455: }
3456: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3457: r = SSH_ERR_INTERNAL_ERROR;
3458: goto out;
3459: }
3460: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3461: goto out;
3462: r = 0;
3463: out:
3464: BIO_free(bio);
3465: return r;
3466: }
3467: #endif /* WITH_OPENSSL */
3468:
3469: /* Serialise "key" to buffer "blob" */
3470: int
3471: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3472: const char *passphrase, const char *comment,
3473: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3474: {
3475: switch (key->type) {
1.9 markus 3476: #ifdef WITH_SSH1
1.1 djm 3477: case KEY_RSA1:
3478: return sshkey_private_rsa1_to_blob(key, blob,
3479: passphrase, comment);
1.9 markus 3480: #endif /* WITH_SSH1 */
3481: #ifdef WITH_OPENSSL
1.1 djm 3482: case KEY_DSA:
3483: case KEY_ECDSA:
3484: case KEY_RSA:
3485: if (force_new_format) {
3486: return sshkey_private_to_blob2(key, blob, passphrase,
3487: comment, new_format_cipher, new_format_rounds);
3488: }
3489: return sshkey_private_pem_to_blob(key, blob,
3490: passphrase, comment);
3491: #endif /* WITH_OPENSSL */
3492: case KEY_ED25519:
3493: return sshkey_private_to_blob2(key, blob, passphrase,
3494: comment, new_format_cipher, new_format_rounds);
3495: default:
3496: return SSH_ERR_KEY_TYPE_UNKNOWN;
3497: }
3498: }
3499:
3500: #ifdef WITH_SSH1
3501: /*
3502: * Parse the public, unencrypted portion of a RSA1 key.
3503: */
3504: int
3505: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3506: struct sshkey **keyp, char **commentp)
3507: {
3508: int r;
3509: struct sshkey *pub = NULL;
3510: struct sshbuf *copy = NULL;
3511:
3512: if (keyp != NULL)
3513: *keyp = NULL;
3514: if (commentp != NULL)
3515: *commentp = NULL;
3516:
3517: /* Check that it is at least big enough to contain the ID string. */
3518: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3519: return SSH_ERR_INVALID_FORMAT;
3520:
3521: /*
3522: * Make sure it begins with the id string. Consume the id string
3523: * from the buffer.
3524: */
3525: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3526: return SSH_ERR_INVALID_FORMAT;
3527: /* Make a working copy of the keyblob and skip past the magic */
3528: if ((copy = sshbuf_fromb(blob)) == NULL)
3529: return SSH_ERR_ALLOC_FAIL;
3530: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3531: goto out;
3532:
3533: /* Skip cipher type, reserved data and key bits. */
3534: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3535: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3536: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3537: goto out;
3538:
3539: /* Read the public key from the buffer. */
3540: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3541: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3542: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3543: goto out;
3544:
3545: /* Finally, the comment */
3546: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3547: goto out;
3548:
3549: /* The encrypted private part is not parsed by this function. */
3550:
3551: r = 0;
3552: if (keyp != NULL)
3553: *keyp = pub;
3554: else
3555: sshkey_free(pub);
3556: pub = NULL;
3557:
3558: out:
3559: if (copy != NULL)
3560: sshbuf_free(copy);
3561: if (pub != NULL)
3562: sshkey_free(pub);
3563: return r;
3564: }
3565:
3566: static int
3567: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3568: struct sshkey **keyp, char **commentp)
3569: {
3570: int r;
3571: u_int16_t check1, check2;
3572: u_int8_t cipher_type;
3573: struct sshbuf *decrypted = NULL, *copy = NULL;
3574: u_char *cp;
3575: char *comment = NULL;
3576: struct sshcipher_ctx ciphercontext;
3577: const struct sshcipher *cipher;
3578: struct sshkey *prv = NULL;
3579:
3580: *keyp = NULL;
3581: if (commentp != NULL)
3582: *commentp = NULL;
3583:
3584: /* Check that it is at least big enough to contain the ID string. */
3585: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3586: return SSH_ERR_INVALID_FORMAT;
3587:
3588: /*
3589: * Make sure it begins with the id string. Consume the id string
3590: * from the buffer.
3591: */
3592: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3593: return SSH_ERR_INVALID_FORMAT;
3594:
3595: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3596: r = SSH_ERR_ALLOC_FAIL;
3597: goto out;
3598: }
3599: if ((copy = sshbuf_fromb(blob)) == NULL ||
3600: (decrypted = sshbuf_new()) == NULL) {
3601: r = SSH_ERR_ALLOC_FAIL;
3602: goto out;
3603: }
3604: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3605: goto out;
3606:
3607: /* Read cipher type. */
3608: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3609: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3610: goto out;
3611:
3612: /* Read the public key and comment from the buffer. */
3613: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3614: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3615: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3616: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3617: goto out;
3618:
3619: /* Check that it is a supported cipher. */
3620: cipher = cipher_by_number(cipher_type);
3621: if (cipher == NULL) {
3622: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3623: goto out;
3624: }
3625: /* Initialize space for decrypted data. */
3626: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3627: goto out;
3628:
3629: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3630: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3631: CIPHER_DECRYPT)) != 0)
3632: goto out;
3633: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3634: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3635: cipher_cleanup(&ciphercontext);
3636: goto out;
3637: }
3638: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3639: goto out;
3640:
3641: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3642: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3643: goto out;
3644: if (check1 != check2) {
3645: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3646: goto out;
3647: }
3648:
3649: /* Read the rest of the private key. */
3650: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3651: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3652: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3653: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3654: goto out;
3655:
3656: /* calculate p-1 and q-1 */
3657: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3658: goto out;
3659:
3660: /* enable blinding */
3661: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3662: r = SSH_ERR_LIBCRYPTO_ERROR;
3663: goto out;
3664: }
3665: r = 0;
3666: *keyp = prv;
3667: prv = NULL;
3668: if (commentp != NULL) {
3669: *commentp = comment;
3670: comment = NULL;
3671: }
3672: out:
3673: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3674: if (comment != NULL)
3675: free(comment);
3676: if (prv != NULL)
3677: sshkey_free(prv);
3678: if (copy != NULL)
3679: sshbuf_free(copy);
3680: if (decrypted != NULL)
3681: sshbuf_free(decrypted);
3682: return r;
3683: }
3684: #endif /* WITH_SSH1 */
3685:
3686: #ifdef WITH_OPENSSL
1.8 djm 3687: static int
1.1 djm 3688: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3689: const char *passphrase, struct sshkey **keyp)
1.1 djm 3690: {
3691: EVP_PKEY *pk = NULL;
3692: struct sshkey *prv = NULL;
3693: BIO *bio = NULL;
3694: int r;
3695:
3696: *keyp = NULL;
3697:
3698: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3699: return SSH_ERR_ALLOC_FAIL;
3700: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3701: (int)sshbuf_len(blob)) {
3702: r = SSH_ERR_ALLOC_FAIL;
3703: goto out;
3704: }
3705:
3706: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3707: (char *)passphrase)) == NULL) {
3708: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3709: goto out;
3710: }
3711: if (pk->type == EVP_PKEY_RSA &&
3712: (type == KEY_UNSPEC || type == KEY_RSA)) {
3713: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3714: r = SSH_ERR_ALLOC_FAIL;
3715: goto out;
3716: }
3717: prv->rsa = EVP_PKEY_get1_RSA(pk);
3718: prv->type = KEY_RSA;
3719: #ifdef DEBUG_PK
3720: RSA_print_fp(stderr, prv->rsa, 8);
3721: #endif
3722: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3723: r = SSH_ERR_LIBCRYPTO_ERROR;
3724: goto out;
3725: }
3726: } else if (pk->type == EVP_PKEY_DSA &&
3727: (type == KEY_UNSPEC || type == KEY_DSA)) {
3728: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3729: r = SSH_ERR_ALLOC_FAIL;
3730: goto out;
3731: }
3732: prv->dsa = EVP_PKEY_get1_DSA(pk);
3733: prv->type = KEY_DSA;
3734: #ifdef DEBUG_PK
3735: DSA_print_fp(stderr, prv->dsa, 8);
3736: #endif
3737: } else if (pk->type == EVP_PKEY_EC &&
3738: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3739: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3740: r = SSH_ERR_ALLOC_FAIL;
3741: goto out;
3742: }
3743: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3744: prv->type = KEY_ECDSA;
3745: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3746: if (prv->ecdsa_nid == -1 ||
3747: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3748: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3749: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3750: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3751: r = SSH_ERR_INVALID_FORMAT;
3752: goto out;
3753: }
3754: #ifdef DEBUG_PK
3755: if (prv != NULL && prv->ecdsa != NULL)
3756: sshkey_dump_ec_key(prv->ecdsa);
3757: #endif
3758: } else {
3759: r = SSH_ERR_INVALID_FORMAT;
3760: goto out;
3761: }
3762: r = 0;
3763: *keyp = prv;
3764: prv = NULL;
3765: out:
3766: BIO_free(bio);
3767: if (pk != NULL)
3768: EVP_PKEY_free(pk);
3769: if (prv != NULL)
3770: sshkey_free(prv);
3771: return r;
3772: }
3773: #endif /* WITH_OPENSSL */
3774:
3775: int
3776: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3777: const char *passphrase, struct sshkey **keyp, char **commentp)
3778: {
3779: int r;
3780:
3781: *keyp = NULL;
3782: if (commentp != NULL)
3783: *commentp = NULL;
3784:
3785: switch (type) {
1.9 markus 3786: #ifdef WITH_SSH1
1.1 djm 3787: case KEY_RSA1:
3788: return sshkey_parse_private_rsa1(blob, passphrase,
3789: keyp, commentp);
1.9 markus 3790: #endif /* WITH_SSH1 */
3791: #ifdef WITH_OPENSSL
1.1 djm 3792: case KEY_DSA:
3793: case KEY_ECDSA:
3794: case KEY_RSA:
1.8 djm 3795: return sshkey_parse_private_pem_fileblob(blob, type,
3796: passphrase, keyp);
1.1 djm 3797: #endif /* WITH_OPENSSL */
3798: case KEY_ED25519:
3799: return sshkey_parse_private2(blob, type, passphrase,
3800: keyp, commentp);
3801: case KEY_UNSPEC:
3802: if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3803: commentp)) == 0)
3804: return 0;
3805: #ifdef WITH_OPENSSL
1.8 djm 3806: return sshkey_parse_private_pem_fileblob(blob, type,
3807: passphrase, keyp);
1.1 djm 3808: #else
3809: return SSH_ERR_INVALID_FORMAT;
3810: #endif /* WITH_OPENSSL */
3811: default:
3812: return SSH_ERR_KEY_TYPE_UNKNOWN;
3813: }
3814: }
3815:
3816: int
3817: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3818: const char *filename, struct sshkey **keyp, char **commentp)
3819: {
3820: int r;
3821:
3822: if (keyp != NULL)
3823: *keyp = NULL;
3824: if (commentp != NULL)
3825: *commentp = NULL;
3826:
3827: #ifdef WITH_SSH1
3828: /* it's a SSH v1 key if the public key part is readable */
3829: if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3830: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3831: passphrase, keyp, commentp);
3832: }
3833: #endif /* WITH_SSH1 */
1.2 markus 3834: if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3835: passphrase, keyp, commentp)) == 0)
3836: return 0;
1.1 djm 3837: return r;
3838: }
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