Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.24
1.24 ! djm 1: /* $OpenBSD: sshkey.c,v 1.23 2015/09/13 14:39:16 tim 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: ret = SSH_ERR_LIBCRYPTO_ERROR;
1532: goto out;
1533: }
1534: *dsap = private;
1535: private = NULL;
1536: ret = 0;
1537: out:
1538: if (private != NULL)
1539: DSA_free(private);
1540: return ret;
1541: }
1542:
1543: int
1544: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1545: {
1546: EC_GROUP *eg;
1547: int nids[] = {
1548: NID_X9_62_prime256v1,
1549: NID_secp384r1,
1550: NID_secp521r1,
1551: -1
1552: };
1553: int nid;
1554: u_int i;
1555: BN_CTX *bnctx;
1556: const EC_GROUP *g = EC_KEY_get0_group(k);
1557:
1558: /*
1559: * The group may be stored in a ASN.1 encoded private key in one of two
1560: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1561: * or explicit group parameters encoded into the key blob. Only the
1562: * "named group" case sets the group NID for us, but we can figure
1563: * it out for the other case by comparing against all the groups that
1564: * are supported.
1565: */
1566: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1567: return nid;
1568: if ((bnctx = BN_CTX_new()) == NULL)
1569: return -1;
1570: for (i = 0; nids[i] != -1; i++) {
1571: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1572: BN_CTX_free(bnctx);
1573: return -1;
1574: }
1575: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1576: break;
1577: EC_GROUP_free(eg);
1578: }
1579: BN_CTX_free(bnctx);
1580: if (nids[i] != -1) {
1581: /* Use the group with the NID attached */
1582: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1583: if (EC_KEY_set_group(k, eg) != 1) {
1584: EC_GROUP_free(eg);
1585: return -1;
1586: }
1587: }
1588: return nids[i];
1589: }
1590:
1591: static int
1592: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1593: {
1594: EC_KEY *private;
1595: int ret = SSH_ERR_INTERNAL_ERROR;
1596:
1597: if (nid == NULL || ecdsap == NULL ||
1598: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1599: return SSH_ERR_INVALID_ARGUMENT;
1600: *ecdsap = NULL;
1601: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1602: ret = SSH_ERR_ALLOC_FAIL;
1603: goto out;
1604: }
1605: if (EC_KEY_generate_key(private) != 1) {
1606: ret = SSH_ERR_LIBCRYPTO_ERROR;
1607: goto out;
1608: }
1609: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1610: *ecdsap = private;
1611: private = NULL;
1612: ret = 0;
1613: out:
1614: if (private != NULL)
1615: EC_KEY_free(private);
1616: return ret;
1617: }
1618: #endif /* WITH_OPENSSL */
1619:
1620: int
1621: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1622: {
1623: struct sshkey *k;
1624: int ret = SSH_ERR_INTERNAL_ERROR;
1625:
1626: if (keyp == NULL)
1627: return SSH_ERR_INVALID_ARGUMENT;
1628: *keyp = NULL;
1629: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1630: return SSH_ERR_ALLOC_FAIL;
1631: switch (type) {
1632: case KEY_ED25519:
1633: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1634: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1635: ret = SSH_ERR_ALLOC_FAIL;
1636: break;
1637: }
1638: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1639: ret = 0;
1640: break;
1641: #ifdef WITH_OPENSSL
1642: case KEY_DSA:
1643: ret = dsa_generate_private_key(bits, &k->dsa);
1644: break;
1645: case KEY_ECDSA:
1646: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1647: &k->ecdsa);
1648: break;
1649: case KEY_RSA:
1650: case KEY_RSA1:
1651: ret = rsa_generate_private_key(bits, &k->rsa);
1652: break;
1653: #endif /* WITH_OPENSSL */
1654: default:
1655: ret = SSH_ERR_INVALID_ARGUMENT;
1656: }
1657: if (ret == 0) {
1658: k->type = type;
1659: *keyp = k;
1660: } else
1661: sshkey_free(k);
1662: return ret;
1663: }
1664:
1665: int
1666: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1667: {
1668: u_int i;
1669: const struct sshkey_cert *from;
1670: struct sshkey_cert *to;
1671: int ret = SSH_ERR_INTERNAL_ERROR;
1672:
1673: if (to_key->cert != NULL) {
1674: cert_free(to_key->cert);
1675: to_key->cert = NULL;
1676: }
1677:
1678: if ((from = from_key->cert) == NULL)
1679: return SSH_ERR_INVALID_ARGUMENT;
1680:
1681: if ((to = to_key->cert = cert_new()) == NULL)
1682: return SSH_ERR_ALLOC_FAIL;
1683:
1684: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1685: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1.22 jsg 1686: (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1.1 djm 1687: return ret;
1688:
1689: to->serial = from->serial;
1690: to->type = from->type;
1691: if (from->key_id == NULL)
1692: to->key_id = NULL;
1693: else if ((to->key_id = strdup(from->key_id)) == NULL)
1694: return SSH_ERR_ALLOC_FAIL;
1695: to->valid_after = from->valid_after;
1696: to->valid_before = from->valid_before;
1697: if (from->signature_key == NULL)
1698: to->signature_key = NULL;
1699: else if ((ret = sshkey_from_private(from->signature_key,
1700: &to->signature_key)) != 0)
1701: return ret;
1702:
1703: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1704: return SSH_ERR_INVALID_ARGUMENT;
1705: if (from->nprincipals > 0) {
1706: if ((to->principals = calloc(from->nprincipals,
1707: sizeof(*to->principals))) == NULL)
1708: return SSH_ERR_ALLOC_FAIL;
1709: for (i = 0; i < from->nprincipals; i++) {
1710: to->principals[i] = strdup(from->principals[i]);
1711: if (to->principals[i] == NULL) {
1712: to->nprincipals = i;
1713: return SSH_ERR_ALLOC_FAIL;
1714: }
1715: }
1716: }
1717: to->nprincipals = from->nprincipals;
1718: return 0;
1719: }
1720:
1721: int
1722: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1723: {
1724: struct sshkey *n = NULL;
1725: int ret = SSH_ERR_INTERNAL_ERROR;
1726:
1.24 ! djm 1727: *pkp = NULL;
1.1 djm 1728: switch (k->type) {
1729: #ifdef WITH_OPENSSL
1730: case KEY_DSA:
1731: case KEY_DSA_CERT:
1732: if ((n = sshkey_new(k->type)) == NULL)
1733: return SSH_ERR_ALLOC_FAIL;
1734: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1735: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1736: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1737: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1738: sshkey_free(n);
1739: return SSH_ERR_ALLOC_FAIL;
1740: }
1741: break;
1742: case KEY_ECDSA:
1743: case KEY_ECDSA_CERT:
1744: if ((n = sshkey_new(k->type)) == NULL)
1745: return SSH_ERR_ALLOC_FAIL;
1746: n->ecdsa_nid = k->ecdsa_nid;
1747: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1748: if (n->ecdsa == NULL) {
1749: sshkey_free(n);
1750: return SSH_ERR_ALLOC_FAIL;
1751: }
1752: if (EC_KEY_set_public_key(n->ecdsa,
1753: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1754: sshkey_free(n);
1755: return SSH_ERR_LIBCRYPTO_ERROR;
1756: }
1757: break;
1758: case KEY_RSA:
1759: case KEY_RSA1:
1760: case KEY_RSA_CERT:
1761: if ((n = sshkey_new(k->type)) == NULL)
1762: return SSH_ERR_ALLOC_FAIL;
1763: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1764: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1765: sshkey_free(n);
1766: return SSH_ERR_ALLOC_FAIL;
1767: }
1768: break;
1769: #endif /* WITH_OPENSSL */
1770: case KEY_ED25519:
1771: case KEY_ED25519_CERT:
1772: if ((n = sshkey_new(k->type)) == NULL)
1773: return SSH_ERR_ALLOC_FAIL;
1774: if (k->ed25519_pk != NULL) {
1775: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1776: sshkey_free(n);
1777: return SSH_ERR_ALLOC_FAIL;
1778: }
1779: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1780: }
1781: break;
1782: default:
1783: return SSH_ERR_KEY_TYPE_UNKNOWN;
1784: }
1785: if (sshkey_is_cert(k)) {
1786: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1787: sshkey_free(n);
1788: return ret;
1789: }
1790: }
1791: *pkp = n;
1792: return 0;
1793: }
1794:
1795: static int
1.14 djm 1796: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1797: {
1.14 djm 1798: struct sshbuf *principals = NULL, *crit = NULL;
1799: struct sshbuf *exts = NULL, *ca = NULL;
1800: u_char *sig = NULL;
1801: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1802: int ret = SSH_ERR_INTERNAL_ERROR;
1803:
1804: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1805: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1806: return ret;
1807:
1.20 djm 1808: /* Parse body of certificate up to signature */
1809: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1810: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1811: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1812: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1813: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1814: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1815: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1816: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1817: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1818: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1819: /* XXX debug print error for ret */
1820: ret = SSH_ERR_INVALID_FORMAT;
1821: goto out;
1822: }
1823:
1824: /* Signature is left in the buffer so we can calculate this length */
1825: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1826:
1827: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1828: ret = SSH_ERR_INVALID_FORMAT;
1829: goto out;
1830: }
1831:
1832: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1833: key->cert->type != SSH2_CERT_TYPE_HOST) {
1834: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1835: goto out;
1836: }
1837:
1.4 djm 1838: /* Parse principals section */
1839: while (sshbuf_len(principals) > 0) {
1840: char *principal = NULL;
1841: char **oprincipals = NULL;
1842:
1.1 djm 1843: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1844: ret = SSH_ERR_INVALID_FORMAT;
1845: goto out;
1846: }
1.4 djm 1847: if ((ret = sshbuf_get_cstring(principals, &principal,
1848: NULL)) != 0) {
1.1 djm 1849: ret = SSH_ERR_INVALID_FORMAT;
1850: goto out;
1851: }
1852: oprincipals = key->cert->principals;
1.20 djm 1853: key->cert->principals = reallocarray(key->cert->principals,
1854: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1.1 djm 1855: if (key->cert->principals == NULL) {
1856: free(principal);
1857: key->cert->principals = oprincipals;
1858: ret = SSH_ERR_ALLOC_FAIL;
1859: goto out;
1860: }
1861: key->cert->principals[key->cert->nprincipals++] = principal;
1862: }
1863:
1.4 djm 1864: /*
1865: * Stash a copies of the critical options and extensions sections
1866: * for later use.
1867: */
1868: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1869: (exts != NULL &&
1870: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1871: goto out;
1872:
1.4 djm 1873: /*
1874: * Validate critical options and extensions sections format.
1875: */
1876: while (sshbuf_len(crit) != 0) {
1877: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1878: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1879: sshbuf_reset(key->cert->critical);
1.1 djm 1880: ret = SSH_ERR_INVALID_FORMAT;
1881: goto out;
1882: }
1883: }
1.4 djm 1884: while (exts != NULL && sshbuf_len(exts) != 0) {
1885: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1886: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1887: sshbuf_reset(key->cert->extensions);
1.1 djm 1888: ret = SSH_ERR_INVALID_FORMAT;
1889: goto out;
1890: }
1891: }
1892:
1.4 djm 1893: /* Parse CA key and check signature */
1.14 djm 1894: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1895: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1896: goto out;
1897: }
1898: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1899: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1900: goto out;
1901: }
1902: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1903: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1904: goto out;
1.4 djm 1905:
1906: /* Success */
1.1 djm 1907: ret = 0;
1908: out:
1.14 djm 1909: sshbuf_free(ca);
1.4 djm 1910: sshbuf_free(crit);
1911: sshbuf_free(exts);
1912: sshbuf_free(principals);
1.1 djm 1913: free(sig);
1914: return ret;
1915: }
1916:
1917: static int
1.14 djm 1918: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1919: int allow_cert)
1.1 djm 1920: {
1.12 djm 1921: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1922: char *ktype = NULL, *curve = NULL;
1923: struct sshkey *key = NULL;
1924: size_t len;
1925: u_char *pk = NULL;
1.14 djm 1926: struct sshbuf *copy;
1.1 djm 1927: #ifdef WITH_OPENSSL
1928: EC_POINT *q = NULL;
1929: #endif /* WITH_OPENSSL */
1930:
1931: #ifdef DEBUG_PK /* XXX */
1.14 djm 1932: sshbuf_dump(b, stderr);
1.1 djm 1933: #endif
1934: *keyp = NULL;
1.14 djm 1935: if ((copy = sshbuf_fromb(b)) == NULL) {
1936: ret = SSH_ERR_ALLOC_FAIL;
1937: goto out;
1938: }
1.1 djm 1939: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1940: ret = SSH_ERR_INVALID_FORMAT;
1941: goto out;
1942: }
1943:
1944: type = sshkey_type_from_name(ktype);
1945: if (!allow_cert && sshkey_type_is_cert(type)) {
1946: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1947: goto out;
1948: }
1949: switch (type) {
1950: #ifdef WITH_OPENSSL
1951: case KEY_RSA_CERT:
1.14 djm 1952: /* Skip nonce */
1.1 djm 1953: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1954: ret = SSH_ERR_INVALID_FORMAT;
1955: goto out;
1956: }
1957: /* FALLTHROUGH */
1958: case KEY_RSA:
1959: if ((key = sshkey_new(type)) == NULL) {
1960: ret = SSH_ERR_ALLOC_FAIL;
1961: goto out;
1962: }
1.16 djm 1963: if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
1964: sshbuf_get_bignum2(b, key->rsa->n) != 0) {
1.1 djm 1965: ret = SSH_ERR_INVALID_FORMAT;
1966: goto out;
1967: }
1968: #ifdef DEBUG_PK
1969: RSA_print_fp(stderr, key->rsa, 8);
1970: #endif
1971: break;
1972: case KEY_DSA_CERT:
1.14 djm 1973: /* Skip nonce */
1.1 djm 1974: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1975: ret = SSH_ERR_INVALID_FORMAT;
1976: goto out;
1977: }
1978: /* FALLTHROUGH */
1979: case KEY_DSA:
1980: if ((key = sshkey_new(type)) == NULL) {
1981: ret = SSH_ERR_ALLOC_FAIL;
1982: goto out;
1983: }
1.16 djm 1984: if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
1985: sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
1986: sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
1987: sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
1.1 djm 1988: ret = SSH_ERR_INVALID_FORMAT;
1989: goto out;
1990: }
1991: #ifdef DEBUG_PK
1992: DSA_print_fp(stderr, key->dsa, 8);
1993: #endif
1994: break;
1995: case KEY_ECDSA_CERT:
1.14 djm 1996: /* Skip nonce */
1.1 djm 1997: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1998: ret = SSH_ERR_INVALID_FORMAT;
1999: goto out;
2000: }
2001: /* FALLTHROUGH */
2002: case KEY_ECDSA:
2003: if ((key = sshkey_new(type)) == NULL) {
2004: ret = SSH_ERR_ALLOC_FAIL;
2005: goto out;
2006: }
1.12 djm 2007: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2008: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2009: ret = SSH_ERR_INVALID_FORMAT;
2010: goto out;
2011: }
2012: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2013: ret = SSH_ERR_EC_CURVE_MISMATCH;
2014: goto out;
2015: }
2016: if (key->ecdsa != NULL)
2017: EC_KEY_free(key->ecdsa);
2018: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2019: == NULL) {
2020: ret = SSH_ERR_EC_CURVE_INVALID;
2021: goto out;
2022: }
2023: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2024: ret = SSH_ERR_ALLOC_FAIL;
2025: goto out;
2026: }
2027: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2028: ret = SSH_ERR_INVALID_FORMAT;
2029: goto out;
2030: }
2031: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2032: q) != 0) {
2033: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2034: goto out;
2035: }
2036: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2037: /* XXX assume it is a allocation error */
2038: ret = SSH_ERR_ALLOC_FAIL;
2039: goto out;
2040: }
2041: #ifdef DEBUG_PK
2042: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2043: #endif
2044: break;
2045: #endif /* WITH_OPENSSL */
2046: case KEY_ED25519_CERT:
1.14 djm 2047: /* Skip nonce */
1.1 djm 2048: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2049: ret = SSH_ERR_INVALID_FORMAT;
2050: goto out;
2051: }
2052: /* FALLTHROUGH */
2053: case KEY_ED25519:
2054: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2055: goto out;
2056: if (len != ED25519_PK_SZ) {
2057: ret = SSH_ERR_INVALID_FORMAT;
2058: goto out;
2059: }
2060: if ((key = sshkey_new(type)) == NULL) {
2061: ret = SSH_ERR_ALLOC_FAIL;
2062: goto out;
2063: }
2064: key->ed25519_pk = pk;
2065: pk = NULL;
2066: break;
2067: case KEY_UNSPEC:
2068: if ((key = sshkey_new(type)) == NULL) {
2069: ret = SSH_ERR_ALLOC_FAIL;
2070: goto out;
2071: }
2072: break;
2073: default:
2074: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2075: goto out;
2076: }
2077:
2078: /* Parse certificate potion */
1.14 djm 2079: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2080: goto out;
2081:
2082: if (key != NULL && sshbuf_len(b) != 0) {
2083: ret = SSH_ERR_INVALID_FORMAT;
2084: goto out;
2085: }
2086: ret = 0;
2087: *keyp = key;
2088: key = NULL;
2089: out:
1.14 djm 2090: sshbuf_free(copy);
1.1 djm 2091: sshkey_free(key);
2092: free(ktype);
2093: free(curve);
2094: free(pk);
2095: #ifdef WITH_OPENSSL
2096: if (q != NULL)
2097: EC_POINT_free(q);
2098: #endif /* WITH_OPENSSL */
2099: return ret;
2100: }
2101:
2102: int
2103: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2104: {
1.14 djm 2105: struct sshbuf *b;
2106: int r;
2107:
2108: if ((b = sshbuf_from(blob, blen)) == NULL)
2109: return SSH_ERR_ALLOC_FAIL;
2110: r = sshkey_from_blob_internal(b, keyp, 1);
2111: sshbuf_free(b);
2112: return r;
2113: }
2114:
2115: int
2116: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2117: {
2118: return sshkey_from_blob_internal(b, keyp, 1);
2119: }
2120:
2121: int
2122: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2123: {
2124: struct sshbuf *b;
2125: int r;
2126:
2127: if ((r = sshbuf_froms(buf, &b)) != 0)
2128: return r;
2129: r = sshkey_from_blob_internal(b, keyp, 1);
2130: sshbuf_free(b);
2131: return r;
1.1 djm 2132: }
2133:
2134: int
2135: sshkey_sign(const struct sshkey *key,
2136: u_char **sigp, size_t *lenp,
2137: const u_char *data, size_t datalen, u_int compat)
2138: {
2139: if (sigp != NULL)
2140: *sigp = NULL;
2141: if (lenp != NULL)
2142: *lenp = 0;
2143: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2144: return SSH_ERR_INVALID_ARGUMENT;
2145: switch (key->type) {
2146: #ifdef WITH_OPENSSL
2147: case KEY_DSA_CERT:
2148: case KEY_DSA:
2149: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2150: case KEY_ECDSA_CERT:
2151: case KEY_ECDSA:
2152: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2153: case KEY_RSA_CERT:
2154: case KEY_RSA:
2155: return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2156: #endif /* WITH_OPENSSL */
2157: case KEY_ED25519:
2158: case KEY_ED25519_CERT:
2159: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2160: default:
2161: return SSH_ERR_KEY_TYPE_UNKNOWN;
2162: }
2163: }
2164:
2165: /*
2166: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2167: */
2168: int
2169: sshkey_verify(const struct sshkey *key,
2170: const u_char *sig, size_t siglen,
2171: const u_char *data, size_t dlen, u_int compat)
2172: {
1.6 djm 2173: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2174: return SSH_ERR_INVALID_ARGUMENT;
2175: switch (key->type) {
2176: #ifdef WITH_OPENSSL
2177: case KEY_DSA_CERT:
2178: case KEY_DSA:
2179: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2180: case KEY_ECDSA_CERT:
2181: case KEY_ECDSA:
2182: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2183: case KEY_RSA_CERT:
2184: case KEY_RSA:
2185: return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2186: #endif /* WITH_OPENSSL */
2187: case KEY_ED25519:
2188: case KEY_ED25519_CERT:
2189: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2190: default:
2191: return SSH_ERR_KEY_TYPE_UNKNOWN;
2192: }
2193: }
2194:
2195: /* Converts a private to a public key */
2196: int
2197: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2198: {
2199: struct sshkey *pk;
2200: int ret = SSH_ERR_INTERNAL_ERROR;
2201:
1.24 ! djm 2202: *dkp = NULL;
1.1 djm 2203: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2204: return SSH_ERR_ALLOC_FAIL;
2205: pk->type = k->type;
2206: pk->flags = k->flags;
2207: pk->ecdsa_nid = k->ecdsa_nid;
2208: pk->dsa = NULL;
2209: pk->ecdsa = NULL;
2210: pk->rsa = NULL;
2211: pk->ed25519_pk = NULL;
2212: pk->ed25519_sk = NULL;
2213:
2214: switch (k->type) {
2215: #ifdef WITH_OPENSSL
2216: case KEY_RSA_CERT:
2217: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2218: goto fail;
2219: /* FALLTHROUGH */
2220: case KEY_RSA1:
2221: case KEY_RSA:
2222: if ((pk->rsa = RSA_new()) == NULL ||
2223: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2224: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2225: ret = SSH_ERR_ALLOC_FAIL;
2226: goto fail;
2227: }
2228: break;
2229: case KEY_DSA_CERT:
2230: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2231: goto fail;
2232: /* FALLTHROUGH */
2233: case KEY_DSA:
2234: if ((pk->dsa = DSA_new()) == NULL ||
2235: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2236: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2237: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2238: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2239: ret = SSH_ERR_ALLOC_FAIL;
2240: goto fail;
2241: }
2242: break;
2243: case KEY_ECDSA_CERT:
2244: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2245: goto fail;
2246: /* FALLTHROUGH */
2247: case KEY_ECDSA:
2248: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2249: if (pk->ecdsa == NULL) {
2250: ret = SSH_ERR_ALLOC_FAIL;
2251: goto fail;
2252: }
2253: if (EC_KEY_set_public_key(pk->ecdsa,
2254: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2255: ret = SSH_ERR_LIBCRYPTO_ERROR;
2256: goto fail;
2257: }
2258: break;
2259: #endif /* WITH_OPENSSL */
2260: case KEY_ED25519_CERT:
2261: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2262: goto fail;
2263: /* FALLTHROUGH */
2264: case KEY_ED25519:
2265: if (k->ed25519_pk != NULL) {
2266: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2267: ret = SSH_ERR_ALLOC_FAIL;
2268: goto fail;
2269: }
2270: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2271: }
2272: break;
2273: default:
2274: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2275: fail:
2276: sshkey_free(pk);
2277: return ret;
2278: }
2279: *dkp = pk;
2280: return 0;
2281: }
2282:
2283: /* Convert a plain key to their _CERT equivalent */
2284: int
1.20 djm 2285: sshkey_to_certified(struct sshkey *k)
1.1 djm 2286: {
2287: int newtype;
2288:
2289: switch (k->type) {
2290: #ifdef WITH_OPENSSL
2291: case KEY_RSA:
1.20 djm 2292: newtype = KEY_RSA_CERT;
1.1 djm 2293: break;
2294: case KEY_DSA:
1.20 djm 2295: newtype = KEY_DSA_CERT;
1.1 djm 2296: break;
2297: case KEY_ECDSA:
2298: newtype = KEY_ECDSA_CERT;
2299: break;
2300: #endif /* WITH_OPENSSL */
2301: case KEY_ED25519:
2302: newtype = KEY_ED25519_CERT;
2303: break;
2304: default:
2305: return SSH_ERR_INVALID_ARGUMENT;
2306: }
2307: if ((k->cert = cert_new()) == NULL)
2308: return SSH_ERR_ALLOC_FAIL;
2309: k->type = newtype;
2310: return 0;
2311: }
2312:
2313: /* Convert a certificate to its raw key equivalent */
2314: int
2315: sshkey_drop_cert(struct sshkey *k)
2316: {
2317: if (!sshkey_type_is_cert(k->type))
2318: return SSH_ERR_KEY_TYPE_UNKNOWN;
2319: cert_free(k->cert);
2320: k->cert = NULL;
2321: k->type = sshkey_type_plain(k->type);
2322: return 0;
2323: }
2324:
2325: /* Sign a certified key, (re-)generating the signed certblob. */
2326: int
2327: sshkey_certify(struct sshkey *k, struct sshkey *ca)
2328: {
2329: struct sshbuf *principals = NULL;
2330: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2331: size_t i, ca_len, sig_len;
2332: int ret = SSH_ERR_INTERNAL_ERROR;
2333: struct sshbuf *cert;
2334:
2335: if (k == NULL || k->cert == NULL ||
2336: k->cert->certblob == NULL || ca == NULL)
2337: return SSH_ERR_INVALID_ARGUMENT;
2338: if (!sshkey_is_cert(k))
2339: return SSH_ERR_KEY_TYPE_UNKNOWN;
2340: if (!sshkey_type_is_valid_ca(ca->type))
2341: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2342:
2343: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2344: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2345:
2346: cert = k->cert->certblob; /* for readability */
2347: sshbuf_reset(cert);
2348: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2349: goto out;
2350:
2351: /* -v01 certs put nonce first */
2352: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2353: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2354: goto out;
1.1 djm 2355:
2356: /* XXX this substantially duplicates to_blob(); refactor */
2357: switch (k->type) {
2358: #ifdef WITH_OPENSSL
2359: case KEY_DSA_CERT:
2360: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2361: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2362: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2363: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2364: goto out;
2365: break;
2366: case KEY_ECDSA_CERT:
2367: if ((ret = sshbuf_put_cstring(cert,
2368: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2369: (ret = sshbuf_put_ec(cert,
2370: EC_KEY_get0_public_key(k->ecdsa),
2371: EC_KEY_get0_group(k->ecdsa))) != 0)
2372: goto out;
2373: break;
2374: case KEY_RSA_CERT:
2375: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2376: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2377: goto out;
2378: break;
2379: #endif /* WITH_OPENSSL */
2380: case KEY_ED25519_CERT:
2381: if ((ret = sshbuf_put_string(cert,
2382: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2383: goto out;
2384: break;
2385: default:
2386: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2387: goto out;
1.1 djm 2388: }
2389:
1.20 djm 2390: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2391: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2392: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2393: goto out;
2394:
2395: if ((principals = sshbuf_new()) == NULL) {
2396: ret = SSH_ERR_ALLOC_FAIL;
2397: goto out;
2398: }
2399: for (i = 0; i < k->cert->nprincipals; i++) {
2400: if ((ret = sshbuf_put_cstring(principals,
2401: k->cert->principals[i])) != 0)
2402: goto out;
2403: }
2404: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2405: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2406: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2407: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2408: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2409: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2410: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2411: goto out;
2412:
2413: /* Sign the whole mess */
2414: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2415: sshbuf_len(cert), 0)) != 0)
2416: goto out;
2417:
2418: /* Append signature and we are done */
2419: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2420: goto out;
2421: ret = 0;
2422: out:
2423: if (ret != 0)
2424: sshbuf_reset(cert);
2425: if (sig_blob != NULL)
2426: free(sig_blob);
2427: if (ca_blob != NULL)
2428: free(ca_blob);
2429: if (principals != NULL)
2430: sshbuf_free(principals);
2431: return ret;
2432: }
2433:
2434: int
2435: sshkey_cert_check_authority(const struct sshkey *k,
2436: int want_host, int require_principal,
2437: const char *name, const char **reason)
2438: {
2439: u_int i, principal_matches;
2440: time_t now = time(NULL);
2441:
2442: if (reason != NULL)
2443: *reason = NULL;
2444:
2445: if (want_host) {
2446: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2447: *reason = "Certificate invalid: not a host certificate";
2448: return SSH_ERR_KEY_CERT_INVALID;
2449: }
2450: } else {
2451: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2452: *reason = "Certificate invalid: not a user certificate";
2453: return SSH_ERR_KEY_CERT_INVALID;
2454: }
2455: }
2456: if (now < 0) {
2457: /* yikes - system clock before epoch! */
2458: *reason = "Certificate invalid: not yet valid";
2459: return SSH_ERR_KEY_CERT_INVALID;
2460: }
2461: if ((u_int64_t)now < k->cert->valid_after) {
2462: *reason = "Certificate invalid: not yet valid";
2463: return SSH_ERR_KEY_CERT_INVALID;
2464: }
2465: if ((u_int64_t)now >= k->cert->valid_before) {
2466: *reason = "Certificate invalid: expired";
2467: return SSH_ERR_KEY_CERT_INVALID;
2468: }
2469: if (k->cert->nprincipals == 0) {
2470: if (require_principal) {
2471: *reason = "Certificate lacks principal list";
2472: return SSH_ERR_KEY_CERT_INVALID;
2473: }
2474: } else if (name != NULL) {
2475: principal_matches = 0;
2476: for (i = 0; i < k->cert->nprincipals; i++) {
2477: if (strcmp(name, k->cert->principals[i]) == 0) {
2478: principal_matches = 1;
2479: break;
2480: }
2481: }
2482: if (!principal_matches) {
2483: *reason = "Certificate invalid: name is not a listed "
2484: "principal";
2485: return SSH_ERR_KEY_CERT_INVALID;
2486: }
2487: }
2488: return 0;
2489: }
2490:
2491: int
2492: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2493: {
2494: int r = SSH_ERR_INTERNAL_ERROR;
2495:
2496: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2497: goto out;
2498: switch (key->type) {
2499: #ifdef WITH_OPENSSL
2500: case KEY_RSA:
2501: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2502: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2503: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2504: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2505: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2506: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2507: goto out;
2508: break;
2509: case KEY_RSA_CERT:
2510: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2511: r = SSH_ERR_INVALID_ARGUMENT;
2512: goto out;
2513: }
2514: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2515: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2516: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2517: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2518: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2519: goto out;
2520: break;
2521: case KEY_DSA:
2522: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2523: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2524: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2525: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2526: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2527: goto out;
2528: break;
2529: case KEY_DSA_CERT:
2530: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2531: r = SSH_ERR_INVALID_ARGUMENT;
2532: goto out;
2533: }
2534: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2535: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2536: goto out;
2537: break;
2538: case KEY_ECDSA:
2539: if ((r = sshbuf_put_cstring(b,
2540: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2541: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2542: (r = sshbuf_put_bignum2(b,
2543: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2544: goto out;
2545: break;
2546: case KEY_ECDSA_CERT:
2547: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2548: r = SSH_ERR_INVALID_ARGUMENT;
2549: goto out;
2550: }
2551: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2552: (r = sshbuf_put_bignum2(b,
2553: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2554: goto out;
2555: break;
2556: #endif /* WITH_OPENSSL */
2557: case KEY_ED25519:
2558: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2559: ED25519_PK_SZ)) != 0 ||
2560: (r = sshbuf_put_string(b, key->ed25519_sk,
2561: ED25519_SK_SZ)) != 0)
2562: goto out;
2563: break;
2564: case KEY_ED25519_CERT:
2565: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2566: r = SSH_ERR_INVALID_ARGUMENT;
2567: goto out;
2568: }
2569: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2570: (r = sshbuf_put_string(b, key->ed25519_pk,
2571: ED25519_PK_SZ)) != 0 ||
2572: (r = sshbuf_put_string(b, key->ed25519_sk,
2573: ED25519_SK_SZ)) != 0)
2574: goto out;
2575: break;
2576: default:
2577: r = SSH_ERR_INVALID_ARGUMENT;
2578: goto out;
2579: }
2580: /* success */
2581: r = 0;
2582: out:
2583: return r;
2584: }
2585:
2586: int
2587: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2588: {
2589: char *tname = NULL, *curve = NULL;
2590: struct sshkey *k = NULL;
1.14 djm 2591: size_t pklen = 0, sklen = 0;
1.1 djm 2592: int type, r = SSH_ERR_INTERNAL_ERROR;
2593: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2594: #ifdef WITH_OPENSSL
2595: BIGNUM *exponent = NULL;
2596: #endif /* WITH_OPENSSL */
2597:
2598: if (kp != NULL)
2599: *kp = NULL;
2600: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2601: goto out;
2602: type = sshkey_type_from_name(tname);
2603: switch (type) {
2604: #ifdef WITH_OPENSSL
2605: case KEY_DSA:
2606: if ((k = sshkey_new_private(type)) == NULL) {
2607: r = SSH_ERR_ALLOC_FAIL;
2608: goto out;
2609: }
2610: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2611: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2612: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2613: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2614: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2615: goto out;
2616: break;
2617: case KEY_DSA_CERT:
1.14 djm 2618: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2619: (r = sshkey_add_private(k)) != 0 ||
2620: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2621: goto out;
2622: break;
2623: case KEY_ECDSA:
2624: if ((k = sshkey_new_private(type)) == NULL) {
2625: r = SSH_ERR_ALLOC_FAIL;
2626: goto out;
2627: }
2628: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2629: r = SSH_ERR_INVALID_ARGUMENT;
2630: goto out;
2631: }
2632: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2633: goto out;
2634: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2635: r = SSH_ERR_EC_CURVE_MISMATCH;
2636: goto out;
2637: }
2638: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2639: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2640: r = SSH_ERR_LIBCRYPTO_ERROR;
2641: goto out;
2642: }
2643: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2644: (r = sshbuf_get_bignum2(buf, exponent)))
2645: goto out;
2646: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2647: r = SSH_ERR_LIBCRYPTO_ERROR;
2648: goto out;
2649: }
2650: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2651: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2652: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2653: goto out;
2654: break;
2655: case KEY_ECDSA_CERT:
2656: if ((exponent = BN_new()) == NULL) {
2657: r = SSH_ERR_LIBCRYPTO_ERROR;
2658: goto out;
2659: }
1.14 djm 2660: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2661: (r = sshkey_add_private(k)) != 0 ||
2662: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2663: goto out;
2664: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2665: r = SSH_ERR_LIBCRYPTO_ERROR;
2666: goto out;
2667: }
2668: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2669: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2670: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2671: goto out;
2672: break;
2673: case KEY_RSA:
2674: if ((k = sshkey_new_private(type)) == NULL) {
2675: r = SSH_ERR_ALLOC_FAIL;
2676: goto out;
2677: }
2678: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2679: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2680: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2681: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2682: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2683: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2684: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2685: goto out;
2686: break;
2687: case KEY_RSA_CERT:
1.14 djm 2688: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2689: (r = sshkey_add_private(k)) != 0 ||
1.22 jsg 2690: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2691: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2692: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2693: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
1.1 djm 2694: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2695: goto out;
2696: break;
2697: #endif /* WITH_OPENSSL */
2698: case KEY_ED25519:
2699: if ((k = sshkey_new_private(type)) == NULL) {
2700: r = SSH_ERR_ALLOC_FAIL;
2701: goto out;
2702: }
2703: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2704: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2705: goto out;
2706: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2707: r = SSH_ERR_INVALID_FORMAT;
2708: goto out;
2709: }
2710: k->ed25519_pk = ed25519_pk;
2711: k->ed25519_sk = ed25519_sk;
2712: ed25519_pk = ed25519_sk = NULL;
2713: break;
2714: case KEY_ED25519_CERT:
1.14 djm 2715: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2716: (r = sshkey_add_private(k)) != 0 ||
2717: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2718: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2719: goto out;
2720: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2721: r = SSH_ERR_INVALID_FORMAT;
2722: goto out;
2723: }
2724: k->ed25519_pk = ed25519_pk;
2725: k->ed25519_sk = ed25519_sk;
2726: ed25519_pk = ed25519_sk = NULL;
2727: break;
2728: default:
2729: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2730: goto out;
2731: }
2732: #ifdef WITH_OPENSSL
2733: /* enable blinding */
2734: switch (k->type) {
2735: case KEY_RSA:
2736: case KEY_RSA_CERT:
2737: case KEY_RSA1:
2738: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2739: r = SSH_ERR_LIBCRYPTO_ERROR;
2740: goto out;
2741: }
2742: break;
2743: }
2744: #endif /* WITH_OPENSSL */
2745: /* success */
2746: r = 0;
2747: if (kp != NULL) {
2748: *kp = k;
2749: k = NULL;
2750: }
2751: out:
2752: free(tname);
2753: free(curve);
2754: #ifdef WITH_OPENSSL
2755: if (exponent != NULL)
2756: BN_clear_free(exponent);
2757: #endif /* WITH_OPENSSL */
2758: sshkey_free(k);
2759: if (ed25519_pk != NULL) {
2760: explicit_bzero(ed25519_pk, pklen);
2761: free(ed25519_pk);
2762: }
2763: if (ed25519_sk != NULL) {
2764: explicit_bzero(ed25519_sk, sklen);
2765: free(ed25519_sk);
2766: }
2767: return r;
2768: }
2769:
2770: #ifdef WITH_OPENSSL
2771: int
2772: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2773: {
2774: BN_CTX *bnctx;
2775: EC_POINT *nq = NULL;
2776: BIGNUM *order, *x, *y, *tmp;
2777: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2778:
2779: if ((bnctx = BN_CTX_new()) == NULL)
2780: return SSH_ERR_ALLOC_FAIL;
2781: BN_CTX_start(bnctx);
2782:
2783: /*
2784: * We shouldn't ever hit this case because bignum_get_ecpoint()
2785: * refuses to load GF2m points.
2786: */
2787: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2788: NID_X9_62_prime_field)
2789: goto out;
2790:
2791: /* Q != infinity */
2792: if (EC_POINT_is_at_infinity(group, public))
2793: goto out;
2794:
2795: if ((x = BN_CTX_get(bnctx)) == NULL ||
2796: (y = BN_CTX_get(bnctx)) == NULL ||
2797: (order = BN_CTX_get(bnctx)) == NULL ||
2798: (tmp = BN_CTX_get(bnctx)) == NULL) {
2799: ret = SSH_ERR_ALLOC_FAIL;
2800: goto out;
2801: }
2802:
2803: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2804: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2805: EC_POINT_get_affine_coordinates_GFp(group, public,
2806: x, y, bnctx) != 1) {
2807: ret = SSH_ERR_LIBCRYPTO_ERROR;
2808: goto out;
2809: }
2810: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2811: BN_num_bits(y) <= BN_num_bits(order) / 2)
2812: goto out;
2813:
2814: /* nQ == infinity (n == order of subgroup) */
2815: if ((nq = EC_POINT_new(group)) == NULL) {
2816: ret = SSH_ERR_ALLOC_FAIL;
2817: goto out;
2818: }
2819: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2820: ret = SSH_ERR_LIBCRYPTO_ERROR;
2821: goto out;
2822: }
2823: if (EC_POINT_is_at_infinity(group, nq) != 1)
2824: goto out;
2825:
2826: /* x < order - 1, y < order - 1 */
2827: if (!BN_sub(tmp, order, BN_value_one())) {
2828: ret = SSH_ERR_LIBCRYPTO_ERROR;
2829: goto out;
2830: }
2831: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2832: goto out;
2833: ret = 0;
2834: out:
2835: BN_CTX_free(bnctx);
2836: if (nq != NULL)
2837: EC_POINT_free(nq);
2838: return ret;
2839: }
2840:
2841: int
2842: sshkey_ec_validate_private(const EC_KEY *key)
2843: {
2844: BN_CTX *bnctx;
2845: BIGNUM *order, *tmp;
2846: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2847:
2848: if ((bnctx = BN_CTX_new()) == NULL)
2849: return SSH_ERR_ALLOC_FAIL;
2850: BN_CTX_start(bnctx);
2851:
2852: if ((order = BN_CTX_get(bnctx)) == NULL ||
2853: (tmp = BN_CTX_get(bnctx)) == NULL) {
2854: ret = SSH_ERR_ALLOC_FAIL;
2855: goto out;
2856: }
2857:
2858: /* log2(private) > log2(order)/2 */
2859: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2860: ret = SSH_ERR_LIBCRYPTO_ERROR;
2861: goto out;
2862: }
2863: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2864: BN_num_bits(order) / 2)
2865: goto out;
2866:
2867: /* private < order - 1 */
2868: if (!BN_sub(tmp, order, BN_value_one())) {
2869: ret = SSH_ERR_LIBCRYPTO_ERROR;
2870: goto out;
2871: }
2872: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2873: goto out;
2874: ret = 0;
2875: out:
2876: BN_CTX_free(bnctx);
2877: return ret;
2878: }
2879:
2880: void
2881: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2882: {
2883: BIGNUM *x, *y;
2884: BN_CTX *bnctx;
2885:
2886: if (point == NULL) {
2887: fputs("point=(NULL)\n", stderr);
2888: return;
2889: }
2890: if ((bnctx = BN_CTX_new()) == NULL) {
2891: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2892: return;
2893: }
2894: BN_CTX_start(bnctx);
2895: if ((x = BN_CTX_get(bnctx)) == NULL ||
2896: (y = BN_CTX_get(bnctx)) == NULL) {
2897: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2898: return;
2899: }
2900: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2901: NID_X9_62_prime_field) {
2902: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2903: return;
2904: }
2905: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2906: bnctx) != 1) {
2907: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2908: __func__);
2909: return;
2910: }
2911: fputs("x=", stderr);
2912: BN_print_fp(stderr, x);
2913: fputs("\ny=", stderr);
2914: BN_print_fp(stderr, y);
2915: fputs("\n", stderr);
2916: BN_CTX_free(bnctx);
2917: }
2918:
2919: void
2920: sshkey_dump_ec_key(const EC_KEY *key)
2921: {
2922: const BIGNUM *exponent;
2923:
2924: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2925: EC_KEY_get0_public_key(key));
2926: fputs("exponent=", stderr);
2927: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2928: fputs("(NULL)", stderr);
2929: else
2930: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2931: fputs("\n", stderr);
2932: }
2933: #endif /* WITH_OPENSSL */
2934:
2935: static int
2936: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2937: const char *passphrase, const char *comment, const char *ciphername,
2938: int rounds)
2939: {
1.4 djm 2940: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2941: u_char salt[SALT_LEN];
1.4 djm 2942: char *b64 = NULL;
1.1 djm 2943: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2944: u_int check;
2945: int r = SSH_ERR_INTERNAL_ERROR;
2946: struct sshcipher_ctx ciphercontext;
2947: const struct sshcipher *cipher;
2948: const char *kdfname = KDFNAME;
2949: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2950:
2951: memset(&ciphercontext, 0, sizeof(ciphercontext));
2952:
2953: if (rounds <= 0)
2954: rounds = DEFAULT_ROUNDS;
2955: if (passphrase == NULL || !strlen(passphrase)) {
2956: ciphername = "none";
2957: kdfname = "none";
2958: } else if (ciphername == NULL)
2959: ciphername = DEFAULT_CIPHERNAME;
2960: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2961: r = SSH_ERR_INVALID_ARGUMENT;
2962: goto out;
2963: }
2964: if ((cipher = cipher_by_name(ciphername)) == NULL) {
2965: r = SSH_ERR_INTERNAL_ERROR;
2966: goto out;
2967: }
2968:
2969: if ((kdf = sshbuf_new()) == NULL ||
2970: (encoded = sshbuf_new()) == NULL ||
2971: (encrypted = sshbuf_new()) == NULL) {
2972: r = SSH_ERR_ALLOC_FAIL;
2973: goto out;
2974: }
2975: blocksize = cipher_blocksize(cipher);
2976: keylen = cipher_keylen(cipher);
2977: ivlen = cipher_ivlen(cipher);
2978: authlen = cipher_authlen(cipher);
2979: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2980: r = SSH_ERR_ALLOC_FAIL;
2981: goto out;
2982: }
2983: if (strcmp(kdfname, "bcrypt") == 0) {
2984: arc4random_buf(salt, SALT_LEN);
2985: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2986: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2987: r = SSH_ERR_INVALID_ARGUMENT;
2988: goto out;
2989: }
2990: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2991: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2992: goto out;
2993: } else if (strcmp(kdfname, "none") != 0) {
2994: /* Unsupported KDF type */
2995: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2996: goto out;
2997: }
2998: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2999: key + keylen, ivlen, 1)) != 0)
3000: goto out;
3001:
3002: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3003: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3004: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3005: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3006: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3007: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3008: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3009: goto out;
3010:
3011: /* set up the buffer that will be encrypted */
3012:
3013: /* Random check bytes */
3014: check = arc4random();
3015: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3016: (r = sshbuf_put_u32(encrypted, check)) != 0)
3017: goto out;
3018:
3019: /* append private key and comment*/
3020: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3021: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3022: goto out;
3023:
3024: /* padding */
3025: i = 0;
3026: while (sshbuf_len(encrypted) % blocksize) {
3027: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3028: goto out;
3029: }
3030:
3031: /* length in destination buffer */
3032: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3033: goto out;
3034:
3035: /* encrypt */
3036: if ((r = sshbuf_reserve(encoded,
3037: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3038: goto out;
3039: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3040: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3041: goto out;
3042:
3043: /* uuencode */
3044: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3045: r = SSH_ERR_ALLOC_FAIL;
3046: goto out;
3047: }
3048:
3049: sshbuf_reset(blob);
3050: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3051: goto out;
3052: for (i = 0; i < strlen(b64); i++) {
3053: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3054: goto out;
3055: /* insert line breaks */
3056: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3057: goto out;
3058: }
3059: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3060: goto out;
3061: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3062: goto out;
3063:
3064: /* success */
3065: r = 0;
3066:
3067: out:
3068: sshbuf_free(kdf);
3069: sshbuf_free(encoded);
3070: sshbuf_free(encrypted);
3071: cipher_cleanup(&ciphercontext);
3072: explicit_bzero(salt, sizeof(salt));
3073: if (key != NULL) {
3074: explicit_bzero(key, keylen + ivlen);
3075: free(key);
3076: }
3077: if (pubkeyblob != NULL) {
3078: explicit_bzero(pubkeyblob, pubkeylen);
3079: free(pubkeyblob);
3080: }
3081: if (b64 != NULL) {
3082: explicit_bzero(b64, strlen(b64));
3083: free(b64);
3084: }
3085: return r;
3086: }
3087:
3088: static int
3089: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3090: struct sshkey **keyp, char **commentp)
3091: {
3092: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3093: const struct sshcipher *cipher = NULL;
3094: const u_char *cp;
3095: int r = SSH_ERR_INTERNAL_ERROR;
3096: size_t encoded_len;
1.18 djm 3097: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3098: struct sshbuf *encoded = NULL, *decoded = NULL;
3099: struct sshbuf *kdf = NULL, *decrypted = NULL;
3100: struct sshcipher_ctx ciphercontext;
3101: struct sshkey *k = NULL;
3102: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3103: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3104:
3105: memset(&ciphercontext, 0, sizeof(ciphercontext));
3106: if (keyp != NULL)
3107: *keyp = NULL;
3108: if (commentp != NULL)
3109: *commentp = NULL;
3110:
3111: if ((encoded = sshbuf_new()) == NULL ||
3112: (decoded = sshbuf_new()) == NULL ||
3113: (decrypted = sshbuf_new()) == NULL) {
3114: r = SSH_ERR_ALLOC_FAIL;
3115: goto out;
3116: }
3117:
3118: /* check preamble */
3119: cp = sshbuf_ptr(blob);
3120: encoded_len = sshbuf_len(blob);
3121: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3122: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3123: r = SSH_ERR_INVALID_FORMAT;
3124: goto out;
3125: }
3126: cp += MARK_BEGIN_LEN;
3127: encoded_len -= MARK_BEGIN_LEN;
3128:
3129: /* Look for end marker, removing whitespace as we go */
3130: while (encoded_len > 0) {
3131: if (*cp != '\n' && *cp != '\r') {
3132: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3133: goto out;
3134: }
3135: last = *cp;
3136: encoded_len--;
3137: cp++;
3138: if (last == '\n') {
3139: if (encoded_len >= MARK_END_LEN &&
3140: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3141: /* \0 terminate */
3142: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3143: goto out;
3144: break;
3145: }
3146: }
3147: }
3148: if (encoded_len == 0) {
3149: r = SSH_ERR_INVALID_FORMAT;
3150: goto out;
3151: }
3152:
3153: /* decode base64 */
1.4 djm 3154: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3155: goto out;
3156:
3157: /* check magic */
3158: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3159: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3160: r = SSH_ERR_INVALID_FORMAT;
3161: goto out;
3162: }
3163: /* parse public portion of key */
3164: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3165: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3166: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3167: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3168: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3169: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3170: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3171: goto out;
3172:
3173: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3174: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3175: goto out;
3176: }
3177: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3178: strcmp(ciphername, "none") != 0) {
3179: /* passphrase required */
3180: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3181: goto out;
3182: }
3183: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3184: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3185: goto out;
3186: }
3187: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3188: r = SSH_ERR_INVALID_FORMAT;
3189: goto out;
3190: }
3191: if (nkeys != 1) {
3192: /* XXX only one key supported */
3193: r = SSH_ERR_INVALID_FORMAT;
3194: goto out;
3195: }
3196:
3197: /* check size of encrypted key blob */
3198: blocksize = cipher_blocksize(cipher);
3199: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3200: r = SSH_ERR_INVALID_FORMAT;
3201: goto out;
3202: }
3203:
3204: /* setup key */
3205: keylen = cipher_keylen(cipher);
3206: ivlen = cipher_ivlen(cipher);
1.18 djm 3207: authlen = cipher_authlen(cipher);
1.1 djm 3208: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3209: r = SSH_ERR_ALLOC_FAIL;
3210: goto out;
3211: }
3212: if (strcmp(kdfname, "bcrypt") == 0) {
3213: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3214: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3215: goto out;
3216: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3217: key, keylen + ivlen, rounds) < 0) {
3218: r = SSH_ERR_INVALID_FORMAT;
3219: goto out;
3220: }
3221: }
3222:
1.18 djm 3223: /* check that an appropriate amount of auth data is present */
3224: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3225: r = SSH_ERR_INVALID_FORMAT;
3226: goto out;
3227: }
3228:
1.1 djm 3229: /* decrypt private portion of key */
3230: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3231: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3232: key + keylen, ivlen, 0)) != 0)
3233: goto out;
3234: if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3235: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3236: /* an integrity error here indicates an incorrect passphrase */
3237: if (r == SSH_ERR_MAC_INVALID)
3238: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3239: goto out;
3240: }
1.18 djm 3241: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3242: goto out;
3243: /* there should be no trailing data */
3244: if (sshbuf_len(decoded) != 0) {
3245: r = SSH_ERR_INVALID_FORMAT;
3246: goto out;
3247: }
3248:
3249: /* check check bytes */
3250: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3251: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3252: goto out;
3253: if (check1 != check2) {
3254: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3255: goto out;
3256: }
3257:
3258: /* Load the private key and comment */
3259: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3260: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3261: goto out;
3262:
3263: /* Check deterministic padding */
3264: i = 0;
3265: while (sshbuf_len(decrypted)) {
3266: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3267: goto out;
3268: if (pad != (++i & 0xff)) {
3269: r = SSH_ERR_INVALID_FORMAT;
3270: goto out;
3271: }
3272: }
3273:
3274: /* XXX decode pubkey and check against private */
3275:
3276: /* success */
3277: r = 0;
3278: if (keyp != NULL) {
3279: *keyp = k;
3280: k = NULL;
3281: }
3282: if (commentp != NULL) {
3283: *commentp = comment;
3284: comment = NULL;
3285: }
3286: out:
3287: pad = 0;
3288: cipher_cleanup(&ciphercontext);
3289: free(ciphername);
3290: free(kdfname);
3291: free(comment);
3292: if (salt != NULL) {
3293: explicit_bzero(salt, slen);
3294: free(salt);
3295: }
3296: if (key != NULL) {
3297: explicit_bzero(key, keylen + ivlen);
3298: free(key);
3299: }
3300: sshbuf_free(encoded);
3301: sshbuf_free(decoded);
3302: sshbuf_free(kdf);
3303: sshbuf_free(decrypted);
3304: sshkey_free(k);
3305: return r;
3306: }
3307:
3308: #if WITH_SSH1
3309: /*
3310: * Serialises the authentication (private) key to a blob, encrypting it with
3311: * passphrase. The identification of the blob (lowest 64 bits of n) will
3312: * precede the key to provide identification of the key without needing a
3313: * passphrase.
3314: */
3315: static int
3316: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3317: const char *passphrase, const char *comment)
3318: {
3319: struct sshbuf *buffer = NULL, *encrypted = NULL;
3320: u_char buf[8];
3321: int r, cipher_num;
3322: struct sshcipher_ctx ciphercontext;
3323: const struct sshcipher *cipher;
3324: u_char *cp;
3325:
3326: /*
3327: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3328: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3329: */
3330: cipher_num = (strcmp(passphrase, "") == 0) ?
3331: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3332: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3333: return SSH_ERR_INTERNAL_ERROR;
3334:
3335: /* This buffer is used to build the secret part of the private key. */
3336: if ((buffer = sshbuf_new()) == NULL)
3337: return SSH_ERR_ALLOC_FAIL;
3338:
3339: /* Put checkbytes for checking passphrase validity. */
3340: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3341: goto out;
3342: arc4random_buf(cp, 2);
3343: memcpy(cp + 2, cp, 2);
3344:
3345: /*
3346: * Store the private key (n and e will not be stored because they
3347: * will be stored in plain text, and storing them also in encrypted
3348: * format would just give known plaintext).
3349: * Note: q and p are stored in reverse order to SSL.
3350: */
3351: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3352: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3353: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3354: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3355: goto out;
3356:
3357: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3358: explicit_bzero(buf, 8);
3359: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3360: goto out;
3361:
3362: /* This buffer will be used to contain the data in the file. */
3363: if ((encrypted = sshbuf_new()) == NULL) {
3364: r = SSH_ERR_ALLOC_FAIL;
3365: goto out;
3366: }
3367:
3368: /* First store keyfile id string. */
3369: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3370: sizeof(LEGACY_BEGIN))) != 0)
3371: goto out;
3372:
3373: /* Store cipher type and "reserved" field. */
3374: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3375: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3376: goto out;
3377:
3378: /* Store public key. This will be in plain text. */
3379: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
1.22 jsg 3380: (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 ||
3381: (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 ||
3382: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
1.1 djm 3383: goto out;
3384:
3385: /* Allocate space for the private part of the key in the buffer. */
3386: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3387: goto out;
3388:
3389: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3390: CIPHER_ENCRYPT)) != 0)
3391: goto out;
3392: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3393: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3394: goto out;
3395: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3396: goto out;
3397:
3398: r = sshbuf_putb(blob, encrypted);
3399:
3400: out:
3401: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3402: explicit_bzero(buf, sizeof(buf));
3403: if (buffer != NULL)
3404: sshbuf_free(buffer);
3405: if (encrypted != NULL)
3406: sshbuf_free(encrypted);
3407:
3408: return r;
3409: }
3410: #endif /* WITH_SSH1 */
3411:
3412: #ifdef WITH_OPENSSL
3413: /* convert SSH v2 key in OpenSSL PEM format */
3414: static int
3415: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3416: const char *_passphrase, const char *comment)
3417: {
3418: int success, r;
3419: int blen, len = strlen(_passphrase);
3420: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3421: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3422: const u_char *bptr;
3423: BIO *bio = NULL;
3424:
3425: if (len > 0 && len <= 4)
3426: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3427: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3428: return SSH_ERR_ALLOC_FAIL;
3429:
3430: switch (key->type) {
3431: case KEY_DSA:
3432: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3433: cipher, passphrase, len, NULL, NULL);
3434: break;
3435: case KEY_ECDSA:
3436: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3437: cipher, passphrase, len, NULL, NULL);
3438: break;
3439: case KEY_RSA:
3440: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3441: cipher, passphrase, len, NULL, NULL);
3442: break;
3443: default:
3444: success = 0;
3445: break;
3446: }
3447: if (success == 0) {
3448: r = SSH_ERR_LIBCRYPTO_ERROR;
3449: goto out;
3450: }
3451: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3452: r = SSH_ERR_INTERNAL_ERROR;
3453: goto out;
3454: }
3455: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3456: goto out;
3457: r = 0;
3458: out:
3459: BIO_free(bio);
3460: return r;
3461: }
3462: #endif /* WITH_OPENSSL */
3463:
3464: /* Serialise "key" to buffer "blob" */
3465: int
3466: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3467: const char *passphrase, const char *comment,
3468: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3469: {
3470: switch (key->type) {
1.9 markus 3471: #ifdef WITH_SSH1
1.1 djm 3472: case KEY_RSA1:
3473: return sshkey_private_rsa1_to_blob(key, blob,
3474: passphrase, comment);
1.9 markus 3475: #endif /* WITH_SSH1 */
3476: #ifdef WITH_OPENSSL
1.1 djm 3477: case KEY_DSA:
3478: case KEY_ECDSA:
3479: case KEY_RSA:
3480: if (force_new_format) {
3481: return sshkey_private_to_blob2(key, blob, passphrase,
3482: comment, new_format_cipher, new_format_rounds);
3483: }
3484: return sshkey_private_pem_to_blob(key, blob,
3485: passphrase, comment);
3486: #endif /* WITH_OPENSSL */
3487: case KEY_ED25519:
3488: return sshkey_private_to_blob2(key, blob, passphrase,
3489: comment, new_format_cipher, new_format_rounds);
3490: default:
3491: return SSH_ERR_KEY_TYPE_UNKNOWN;
3492: }
3493: }
3494:
3495: #ifdef WITH_SSH1
3496: /*
3497: * Parse the public, unencrypted portion of a RSA1 key.
3498: */
3499: int
3500: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3501: struct sshkey **keyp, char **commentp)
3502: {
3503: int r;
3504: struct sshkey *pub = NULL;
3505: struct sshbuf *copy = NULL;
3506:
3507: if (keyp != NULL)
3508: *keyp = NULL;
3509: if (commentp != NULL)
3510: *commentp = NULL;
3511:
3512: /* Check that it is at least big enough to contain the ID string. */
3513: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3514: return SSH_ERR_INVALID_FORMAT;
3515:
3516: /*
3517: * Make sure it begins with the id string. Consume the id string
3518: * from the buffer.
3519: */
3520: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3521: return SSH_ERR_INVALID_FORMAT;
3522: /* Make a working copy of the keyblob and skip past the magic */
3523: if ((copy = sshbuf_fromb(blob)) == NULL)
3524: return SSH_ERR_ALLOC_FAIL;
3525: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3526: goto out;
3527:
3528: /* Skip cipher type, reserved data and key bits. */
3529: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3530: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3531: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3532: goto out;
3533:
3534: /* Read the public key from the buffer. */
3535: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3536: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3537: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3538: goto out;
3539:
3540: /* Finally, the comment */
3541: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3542: goto out;
3543:
3544: /* The encrypted private part is not parsed by this function. */
3545:
3546: r = 0;
3547: if (keyp != NULL)
3548: *keyp = pub;
3549: else
3550: sshkey_free(pub);
3551: pub = NULL;
3552:
3553: out:
3554: if (copy != NULL)
3555: sshbuf_free(copy);
3556: if (pub != NULL)
3557: sshkey_free(pub);
3558: return r;
3559: }
3560:
3561: static int
3562: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3563: struct sshkey **keyp, char **commentp)
3564: {
3565: int r;
3566: u_int16_t check1, check2;
3567: u_int8_t cipher_type;
3568: struct sshbuf *decrypted = NULL, *copy = NULL;
3569: u_char *cp;
3570: char *comment = NULL;
3571: struct sshcipher_ctx ciphercontext;
3572: const struct sshcipher *cipher;
3573: struct sshkey *prv = NULL;
3574:
3575: *keyp = NULL;
3576: if (commentp != NULL)
3577: *commentp = NULL;
3578:
3579: /* Check that it is at least big enough to contain the ID string. */
3580: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3581: return SSH_ERR_INVALID_FORMAT;
3582:
3583: /*
3584: * Make sure it begins with the id string. Consume the id string
3585: * from the buffer.
3586: */
3587: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3588: return SSH_ERR_INVALID_FORMAT;
3589:
3590: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3591: r = SSH_ERR_ALLOC_FAIL;
3592: goto out;
3593: }
3594: if ((copy = sshbuf_fromb(blob)) == NULL ||
3595: (decrypted = sshbuf_new()) == NULL) {
3596: r = SSH_ERR_ALLOC_FAIL;
3597: goto out;
3598: }
3599: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3600: goto out;
3601:
3602: /* Read cipher type. */
3603: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3604: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3605: goto out;
3606:
3607: /* Read the public key and comment from the buffer. */
3608: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3609: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3610: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3611: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3612: goto out;
3613:
3614: /* Check that it is a supported cipher. */
3615: cipher = cipher_by_number(cipher_type);
3616: if (cipher == NULL) {
3617: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3618: goto out;
3619: }
3620: /* Initialize space for decrypted data. */
3621: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3622: goto out;
3623:
3624: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3625: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3626: CIPHER_DECRYPT)) != 0)
3627: goto out;
3628: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3629: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3630: cipher_cleanup(&ciphercontext);
3631: goto out;
3632: }
3633: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3634: goto out;
3635:
3636: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3637: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3638: goto out;
3639: if (check1 != check2) {
3640: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3641: goto out;
3642: }
3643:
3644: /* Read the rest of the private key. */
3645: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3646: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3647: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3648: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3649: goto out;
3650:
3651: /* calculate p-1 and q-1 */
3652: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3653: goto out;
3654:
3655: /* enable blinding */
3656: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3657: r = SSH_ERR_LIBCRYPTO_ERROR;
3658: goto out;
3659: }
3660: r = 0;
3661: *keyp = prv;
3662: prv = NULL;
3663: if (commentp != NULL) {
3664: *commentp = comment;
3665: comment = NULL;
3666: }
3667: out:
3668: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3669: if (comment != NULL)
3670: free(comment);
3671: if (prv != NULL)
3672: sshkey_free(prv);
3673: if (copy != NULL)
3674: sshbuf_free(copy);
3675: if (decrypted != NULL)
3676: sshbuf_free(decrypted);
3677: return r;
3678: }
3679: #endif /* WITH_SSH1 */
3680:
3681: #ifdef WITH_OPENSSL
1.8 djm 3682: static int
1.1 djm 3683: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3684: const char *passphrase, struct sshkey **keyp)
1.1 djm 3685: {
3686: EVP_PKEY *pk = NULL;
3687: struct sshkey *prv = NULL;
3688: BIO *bio = NULL;
3689: int r;
3690:
3691: *keyp = NULL;
3692:
3693: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3694: return SSH_ERR_ALLOC_FAIL;
3695: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3696: (int)sshbuf_len(blob)) {
3697: r = SSH_ERR_ALLOC_FAIL;
3698: goto out;
3699: }
3700:
3701: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3702: (char *)passphrase)) == NULL) {
3703: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3704: goto out;
3705: }
3706: if (pk->type == EVP_PKEY_RSA &&
3707: (type == KEY_UNSPEC || type == KEY_RSA)) {
3708: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3709: r = SSH_ERR_ALLOC_FAIL;
3710: goto out;
3711: }
3712: prv->rsa = EVP_PKEY_get1_RSA(pk);
3713: prv->type = KEY_RSA;
3714: #ifdef DEBUG_PK
3715: RSA_print_fp(stderr, prv->rsa, 8);
3716: #endif
3717: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3718: r = SSH_ERR_LIBCRYPTO_ERROR;
3719: goto out;
3720: }
3721: } else if (pk->type == EVP_PKEY_DSA &&
3722: (type == KEY_UNSPEC || type == KEY_DSA)) {
3723: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3724: r = SSH_ERR_ALLOC_FAIL;
3725: goto out;
3726: }
3727: prv->dsa = EVP_PKEY_get1_DSA(pk);
3728: prv->type = KEY_DSA;
3729: #ifdef DEBUG_PK
3730: DSA_print_fp(stderr, prv->dsa, 8);
3731: #endif
3732: } else if (pk->type == EVP_PKEY_EC &&
3733: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3734: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3735: r = SSH_ERR_ALLOC_FAIL;
3736: goto out;
3737: }
3738: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3739: prv->type = KEY_ECDSA;
3740: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3741: if (prv->ecdsa_nid == -1 ||
3742: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3743: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3744: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3745: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3746: r = SSH_ERR_INVALID_FORMAT;
3747: goto out;
3748: }
3749: #ifdef DEBUG_PK
3750: if (prv != NULL && prv->ecdsa != NULL)
3751: sshkey_dump_ec_key(prv->ecdsa);
3752: #endif
3753: } else {
3754: r = SSH_ERR_INVALID_FORMAT;
3755: goto out;
3756: }
3757: r = 0;
3758: *keyp = prv;
3759: prv = NULL;
3760: out:
3761: BIO_free(bio);
3762: if (pk != NULL)
3763: EVP_PKEY_free(pk);
3764: if (prv != NULL)
3765: sshkey_free(prv);
3766: return r;
3767: }
3768: #endif /* WITH_OPENSSL */
3769:
3770: int
3771: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3772: const char *passphrase, struct sshkey **keyp, char **commentp)
3773: {
3774: *keyp = NULL;
3775: if (commentp != NULL)
3776: *commentp = NULL;
3777:
3778: switch (type) {
1.9 markus 3779: #ifdef WITH_SSH1
1.1 djm 3780: case KEY_RSA1:
3781: return sshkey_parse_private_rsa1(blob, passphrase,
3782: keyp, commentp);
1.9 markus 3783: #endif /* WITH_SSH1 */
3784: #ifdef WITH_OPENSSL
1.1 djm 3785: case KEY_DSA:
3786: case KEY_ECDSA:
3787: case KEY_RSA:
1.8 djm 3788: return sshkey_parse_private_pem_fileblob(blob, type,
3789: passphrase, keyp);
1.1 djm 3790: #endif /* WITH_OPENSSL */
3791: case KEY_ED25519:
3792: return sshkey_parse_private2(blob, type, passphrase,
3793: keyp, commentp);
3794: case KEY_UNSPEC:
1.23 tim 3795: if (sshkey_parse_private2(blob, type, passphrase, keyp,
3796: commentp) == 0)
1.1 djm 3797: return 0;
3798: #ifdef WITH_OPENSSL
1.8 djm 3799: return sshkey_parse_private_pem_fileblob(blob, type,
3800: passphrase, keyp);
1.1 djm 3801: #else
3802: return SSH_ERR_INVALID_FORMAT;
3803: #endif /* WITH_OPENSSL */
3804: default:
3805: return SSH_ERR_KEY_TYPE_UNKNOWN;
3806: }
3807: }
3808:
3809: int
3810: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3811: struct sshkey **keyp, char **commentp)
1.1 djm 3812: {
3813: if (keyp != NULL)
3814: *keyp = NULL;
3815: if (commentp != NULL)
3816: *commentp = NULL;
3817:
3818: #ifdef WITH_SSH1
3819: /* it's a SSH v1 key if the public key part is readable */
1.23 tim 3820: if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) {
1.1 djm 3821: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3822: passphrase, keyp, commentp);
3823: }
3824: #endif /* WITH_SSH1 */
1.23 tim 3825: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3826: passphrase, keyp, commentp);
1.1 djm 3827: }
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