Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.27
1.27 ! djm 1: /* $OpenBSD: sshkey.c,v 1.26 2015/11/16 23:47:52 millert 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;
1.26 millert 1193: else if (strchr(" \t\r\n", cp[e]) == NULL)
1.1 djm 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;
1.25 djm 1209: char *ep, *cp, *space;
1.1 djm 1210: int r, type, curve_nid = -1;
1211: struct sshbuf *blob;
1212: #ifdef WITH_SSH1
1213: u_long bits;
1214: #endif /* WITH_SSH1 */
1215:
1216: cp = *cpp;
1217:
1218: switch (ret->type) {
1219: case KEY_RSA1:
1220: #ifdef WITH_SSH1
1221: /* Get number of bits. */
1222: bits = strtoul(cp, &ep, 10);
1.26 millert 1223: if (*cp == '\0' || strchr(" \t\r\n", *ep) == NULL ||
1.1 djm 1224: bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1225: return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1226: /* Get public exponent, public modulus. */
1227: if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1228: return r;
1229: if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1230: return r;
1231: /* validate the claimed number of bits */
1232: if (BN_num_bits(ret->rsa->n) != (int)bits)
1233: return SSH_ERR_KEY_BITS_MISMATCH;
1.25 djm 1234: *cpp = ep;
1.1 djm 1235: retval = 0;
1236: #endif /* WITH_SSH1 */
1237: break;
1238: case KEY_UNSPEC:
1239: case KEY_RSA:
1240: case KEY_DSA:
1241: case KEY_ECDSA:
1242: case KEY_ED25519:
1243: case KEY_DSA_CERT:
1244: case KEY_ECDSA_CERT:
1245: case KEY_RSA_CERT:
1246: case KEY_ED25519_CERT:
1247: space = strchr(cp, ' ');
1248: if (space == NULL)
1249: return SSH_ERR_INVALID_FORMAT;
1250: *space = '\0';
1251: type = sshkey_type_from_name(cp);
1252: if (sshkey_type_plain(type) == KEY_ECDSA &&
1253: (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1254: return SSH_ERR_EC_CURVE_INVALID;
1255: *space = ' ';
1256: if (type == KEY_UNSPEC)
1257: return SSH_ERR_INVALID_FORMAT;
1258: cp = space+1;
1259: if (*cp == '\0')
1260: return SSH_ERR_INVALID_FORMAT;
1.5 djm 1261: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1262: return SSH_ERR_KEY_TYPE_MISMATCH;
1263: if ((blob = sshbuf_new()) == NULL)
1264: return SSH_ERR_ALLOC_FAIL;
1265: /* trim comment */
1266: space = strchr(cp, ' ');
1.10 markus 1267: if (space) {
1268: /* advance 'space': skip whitespace */
1269: *space++ = '\0';
1270: while (*space == ' ' || *space == '\t')
1271: space++;
1.25 djm 1272: ep = space;
1.10 markus 1273: } else
1.25 djm 1274: ep = cp + strlen(cp);
1.1 djm 1275: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1276: sshbuf_free(blob);
1277: return r;
1278: }
1279: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1280: sshbuf_len(blob), &k)) != 0) {
1281: sshbuf_free(blob);
1282: return r;
1283: }
1284: sshbuf_free(blob);
1285: if (k->type != type) {
1286: sshkey_free(k);
1287: return SSH_ERR_KEY_TYPE_MISMATCH;
1288: }
1289: if (sshkey_type_plain(type) == KEY_ECDSA &&
1290: curve_nid != k->ecdsa_nid) {
1291: sshkey_free(k);
1292: return SSH_ERR_EC_CURVE_MISMATCH;
1293: }
1.5 djm 1294: ret->type = type;
1.1 djm 1295: if (sshkey_is_cert(ret)) {
1296: if (!sshkey_is_cert(k)) {
1297: sshkey_free(k);
1298: return SSH_ERR_EXPECTED_CERT;
1299: }
1300: if (ret->cert != NULL)
1301: cert_free(ret->cert);
1302: ret->cert = k->cert;
1303: k->cert = NULL;
1304: }
1.25 djm 1305: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1306: #ifdef WITH_OPENSSL
1.25 djm 1307: case KEY_RSA:
1.1 djm 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
1.25 djm 1315: break;
1316: case KEY_DSA:
1.1 djm 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
1.25 djm 1324: break;
1325: case KEY_ECDSA:
1.1 djm 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
1.25 djm 1335: break;
1.1 djm 1336: #endif /* WITH_OPENSSL */
1.25 djm 1337: case KEY_ED25519:
1.1 djm 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
1.25 djm 1344: break;
1.1 djm 1345: }
1.25 djm 1346: *cpp = ep;
1.1 djm 1347: retval = 0;
1348: /*XXXX*/
1349: sshkey_free(k);
1350: if (retval != 0)
1351: break;
1352: break;
1353: default:
1354: return SSH_ERR_INVALID_ARGUMENT;
1355: }
1356: return retval;
1357: }
1358:
1359: int
1.19 djm 1360: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1361: {
1.19 djm 1362: int r = SSH_ERR_INTERNAL_ERROR;
1363: struct sshbuf *b = NULL;
1.1 djm 1364: char *uu = NULL;
1.19 djm 1365:
1366: if (b64p != NULL)
1367: *b64p = NULL;
1368: if ((b = sshbuf_new()) == NULL)
1369: return SSH_ERR_ALLOC_FAIL;
1370: if ((r = sshkey_putb(key, b)) != 0)
1371: goto out;
1372: if ((uu = sshbuf_dtob64(b)) == NULL) {
1373: r = SSH_ERR_ALLOC_FAIL;
1374: goto out;
1375: }
1376: /* Success */
1377: if (b64p != NULL) {
1378: *b64p = uu;
1379: uu = NULL;
1380: }
1381: r = 0;
1382: out:
1383: sshbuf_free(b);
1384: free(uu);
1385: return r;
1386: }
1387:
1388: static int
1389: sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
1390: {
1391: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1392: #ifdef WITH_SSH1
1393: u_int bits = 0;
1394: char *dec_e = NULL, *dec_n = NULL;
1395:
1.19 djm 1396: if (key->rsa == NULL || key->rsa->e == NULL ||
1397: key->rsa->n == NULL) {
1398: r = SSH_ERR_INVALID_ARGUMENT;
1399: goto out;
1400: }
1401: if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1402: (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1403: r = SSH_ERR_ALLOC_FAIL;
1404: goto out;
1405: }
1406: /* size of modulus 'n' */
1407: if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1408: r = SSH_ERR_INVALID_ARGUMENT;
1409: goto out;
1.1 djm 1410: }
1.19 djm 1411: if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1412: goto out;
1413:
1414: /* Success */
1415: r = 0;
1416: out:
1417: if (dec_e != NULL)
1418: OPENSSL_free(dec_e);
1419: if (dec_n != NULL)
1420: OPENSSL_free(dec_n);
1.1 djm 1421: #endif /* WITH_SSH1 */
1.19 djm 1422:
1423: return r;
1424: }
1425:
1426: static int
1427: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1428: {
1429: int r = SSH_ERR_INTERNAL_ERROR;
1430: char *uu = NULL;
1431:
1432: if (key->type == KEY_RSA1) {
1433: if ((r = sshkey_format_rsa1(key, b)) != 0)
1.1 djm 1434: goto out;
1.19 djm 1435: } else {
1436: /* Unsupported key types handled in sshkey_to_base64() */
1437: if ((r = sshkey_to_base64(key, &uu)) != 0)
1.1 djm 1438: goto out;
1.19 djm 1439: if ((r = sshbuf_putf(b, "%s %s",
1440: sshkey_ssh_name(key), uu)) != 0)
1.1 djm 1441: goto out;
1.19 djm 1442: }
1443: r = 0;
1444: out:
1445: free(uu);
1446: return r;
1447: }
1448:
1449: int
1450: sshkey_write(const struct sshkey *key, FILE *f)
1451: {
1452: struct sshbuf *b = NULL;
1453: int r = SSH_ERR_INTERNAL_ERROR;
1454:
1455: if ((b = sshbuf_new()) == NULL)
1456: return SSH_ERR_ALLOC_FAIL;
1457: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1458: goto out;
1459: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1460: if (feof(f))
1461: errno = EPIPE;
1.19 djm 1462: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1463: goto out;
1464: }
1.19 djm 1465: /* Success */
1466: r = 0;
1.1 djm 1467: out:
1.19 djm 1468: sshbuf_free(b);
1469: return r;
1.1 djm 1470: }
1471:
1472: const char *
1473: sshkey_cert_type(const struct sshkey *k)
1474: {
1475: switch (k->cert->type) {
1476: case SSH2_CERT_TYPE_USER:
1477: return "user";
1478: case SSH2_CERT_TYPE_HOST:
1479: return "host";
1480: default:
1481: return "unknown";
1482: }
1483: }
1484:
1485: #ifdef WITH_OPENSSL
1486: static int
1487: rsa_generate_private_key(u_int bits, RSA **rsap)
1488: {
1489: RSA *private = NULL;
1490: BIGNUM *f4 = NULL;
1491: int ret = SSH_ERR_INTERNAL_ERROR;
1492:
1493: if (rsap == NULL ||
1494: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1495: bits > SSHBUF_MAX_BIGNUM * 8)
1496: return SSH_ERR_INVALID_ARGUMENT;
1497: *rsap = NULL;
1498: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1499: ret = SSH_ERR_ALLOC_FAIL;
1500: goto out;
1501: }
1502: if (!BN_set_word(f4, RSA_F4) ||
1503: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1504: ret = SSH_ERR_LIBCRYPTO_ERROR;
1505: goto out;
1506: }
1507: *rsap = private;
1508: private = NULL;
1509: ret = 0;
1510: out:
1511: if (private != NULL)
1512: RSA_free(private);
1513: if (f4 != NULL)
1514: BN_free(f4);
1515: return ret;
1516: }
1517:
1518: static int
1519: dsa_generate_private_key(u_int bits, DSA **dsap)
1520: {
1521: DSA *private;
1522: int ret = SSH_ERR_INTERNAL_ERROR;
1523:
1524: if (dsap == NULL || bits != 1024)
1525: return SSH_ERR_INVALID_ARGUMENT;
1526: if ((private = DSA_new()) == NULL) {
1527: ret = SSH_ERR_ALLOC_FAIL;
1528: goto out;
1529: }
1530: *dsap = NULL;
1531: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1532: NULL, NULL) || !DSA_generate_key(private)) {
1533: ret = SSH_ERR_LIBCRYPTO_ERROR;
1534: goto out;
1535: }
1536: *dsap = private;
1537: private = NULL;
1538: ret = 0;
1539: out:
1540: if (private != NULL)
1541: DSA_free(private);
1542: return ret;
1543: }
1544:
1545: int
1546: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1547: {
1548: EC_GROUP *eg;
1549: int nids[] = {
1550: NID_X9_62_prime256v1,
1551: NID_secp384r1,
1552: NID_secp521r1,
1553: -1
1554: };
1555: int nid;
1556: u_int i;
1557: BN_CTX *bnctx;
1558: const EC_GROUP *g = EC_KEY_get0_group(k);
1559:
1560: /*
1561: * The group may be stored in a ASN.1 encoded private key in one of two
1562: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1563: * or explicit group parameters encoded into the key blob. Only the
1564: * "named group" case sets the group NID for us, but we can figure
1565: * it out for the other case by comparing against all the groups that
1566: * are supported.
1567: */
1568: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1569: return nid;
1570: if ((bnctx = BN_CTX_new()) == NULL)
1571: return -1;
1572: for (i = 0; nids[i] != -1; i++) {
1573: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1574: BN_CTX_free(bnctx);
1575: return -1;
1576: }
1577: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1578: break;
1579: EC_GROUP_free(eg);
1580: }
1581: BN_CTX_free(bnctx);
1582: if (nids[i] != -1) {
1583: /* Use the group with the NID attached */
1584: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1585: if (EC_KEY_set_group(k, eg) != 1) {
1586: EC_GROUP_free(eg);
1587: return -1;
1588: }
1589: }
1590: return nids[i];
1591: }
1592:
1593: static int
1594: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1595: {
1596: EC_KEY *private;
1597: int ret = SSH_ERR_INTERNAL_ERROR;
1598:
1599: if (nid == NULL || ecdsap == NULL ||
1600: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1601: return SSH_ERR_INVALID_ARGUMENT;
1602: *ecdsap = NULL;
1603: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1604: ret = SSH_ERR_ALLOC_FAIL;
1605: goto out;
1606: }
1607: if (EC_KEY_generate_key(private) != 1) {
1608: ret = SSH_ERR_LIBCRYPTO_ERROR;
1609: goto out;
1610: }
1611: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1612: *ecdsap = private;
1613: private = NULL;
1614: ret = 0;
1615: out:
1616: if (private != NULL)
1617: EC_KEY_free(private);
1618: return ret;
1619: }
1620: #endif /* WITH_OPENSSL */
1621:
1622: int
1623: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1624: {
1625: struct sshkey *k;
1626: int ret = SSH_ERR_INTERNAL_ERROR;
1627:
1628: if (keyp == NULL)
1629: return SSH_ERR_INVALID_ARGUMENT;
1630: *keyp = NULL;
1631: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1632: return SSH_ERR_ALLOC_FAIL;
1633: switch (type) {
1634: case KEY_ED25519:
1635: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1636: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1637: ret = SSH_ERR_ALLOC_FAIL;
1638: break;
1639: }
1640: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1641: ret = 0;
1642: break;
1643: #ifdef WITH_OPENSSL
1644: case KEY_DSA:
1645: ret = dsa_generate_private_key(bits, &k->dsa);
1646: break;
1647: case KEY_ECDSA:
1648: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1649: &k->ecdsa);
1650: break;
1651: case KEY_RSA:
1652: case KEY_RSA1:
1653: ret = rsa_generate_private_key(bits, &k->rsa);
1654: break;
1655: #endif /* WITH_OPENSSL */
1656: default:
1657: ret = SSH_ERR_INVALID_ARGUMENT;
1658: }
1659: if (ret == 0) {
1660: k->type = type;
1661: *keyp = k;
1662: } else
1663: sshkey_free(k);
1664: return ret;
1665: }
1666:
1667: int
1668: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1669: {
1670: u_int i;
1671: const struct sshkey_cert *from;
1672: struct sshkey_cert *to;
1673: int ret = SSH_ERR_INTERNAL_ERROR;
1674:
1675: if (to_key->cert != NULL) {
1676: cert_free(to_key->cert);
1677: to_key->cert = NULL;
1678: }
1679:
1680: if ((from = from_key->cert) == NULL)
1681: return SSH_ERR_INVALID_ARGUMENT;
1682:
1683: if ((to = to_key->cert = cert_new()) == NULL)
1684: return SSH_ERR_ALLOC_FAIL;
1685:
1686: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1687: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1.22 jsg 1688: (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1.1 djm 1689: return ret;
1690:
1691: to->serial = from->serial;
1692: to->type = from->type;
1693: if (from->key_id == NULL)
1694: to->key_id = NULL;
1695: else if ((to->key_id = strdup(from->key_id)) == NULL)
1696: return SSH_ERR_ALLOC_FAIL;
1697: to->valid_after = from->valid_after;
1698: to->valid_before = from->valid_before;
1699: if (from->signature_key == NULL)
1700: to->signature_key = NULL;
1701: else if ((ret = sshkey_from_private(from->signature_key,
1702: &to->signature_key)) != 0)
1703: return ret;
1704:
1705: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1706: return SSH_ERR_INVALID_ARGUMENT;
1707: if (from->nprincipals > 0) {
1708: if ((to->principals = calloc(from->nprincipals,
1709: sizeof(*to->principals))) == NULL)
1710: return SSH_ERR_ALLOC_FAIL;
1711: for (i = 0; i < from->nprincipals; i++) {
1712: to->principals[i] = strdup(from->principals[i]);
1713: if (to->principals[i] == NULL) {
1714: to->nprincipals = i;
1715: return SSH_ERR_ALLOC_FAIL;
1716: }
1717: }
1718: }
1719: to->nprincipals = from->nprincipals;
1720: return 0;
1721: }
1722:
1723: int
1724: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1725: {
1726: struct sshkey *n = NULL;
1727: int ret = SSH_ERR_INTERNAL_ERROR;
1728:
1.24 djm 1729: *pkp = NULL;
1.1 djm 1730: switch (k->type) {
1731: #ifdef WITH_OPENSSL
1732: case KEY_DSA:
1733: case KEY_DSA_CERT:
1734: if ((n = sshkey_new(k->type)) == NULL)
1735: return SSH_ERR_ALLOC_FAIL;
1736: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1737: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1738: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1739: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1740: sshkey_free(n);
1741: return SSH_ERR_ALLOC_FAIL;
1742: }
1743: break;
1744: case KEY_ECDSA:
1745: case KEY_ECDSA_CERT:
1746: if ((n = sshkey_new(k->type)) == NULL)
1747: return SSH_ERR_ALLOC_FAIL;
1748: n->ecdsa_nid = k->ecdsa_nid;
1749: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1750: if (n->ecdsa == NULL) {
1751: sshkey_free(n);
1752: return SSH_ERR_ALLOC_FAIL;
1753: }
1754: if (EC_KEY_set_public_key(n->ecdsa,
1755: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1756: sshkey_free(n);
1757: return SSH_ERR_LIBCRYPTO_ERROR;
1758: }
1759: break;
1760: case KEY_RSA:
1761: case KEY_RSA1:
1762: case KEY_RSA_CERT:
1763: if ((n = sshkey_new(k->type)) == NULL)
1764: return SSH_ERR_ALLOC_FAIL;
1765: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1766: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1767: sshkey_free(n);
1768: return SSH_ERR_ALLOC_FAIL;
1769: }
1770: break;
1771: #endif /* WITH_OPENSSL */
1772: case KEY_ED25519:
1773: case KEY_ED25519_CERT:
1774: if ((n = sshkey_new(k->type)) == NULL)
1775: return SSH_ERR_ALLOC_FAIL;
1776: if (k->ed25519_pk != NULL) {
1777: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1778: sshkey_free(n);
1779: return SSH_ERR_ALLOC_FAIL;
1780: }
1781: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1782: }
1783: break;
1784: default:
1785: return SSH_ERR_KEY_TYPE_UNKNOWN;
1786: }
1787: if (sshkey_is_cert(k)) {
1788: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1789: sshkey_free(n);
1790: return ret;
1791: }
1792: }
1793: *pkp = n;
1794: return 0;
1795: }
1796:
1797: static int
1.14 djm 1798: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1799: {
1.14 djm 1800: struct sshbuf *principals = NULL, *crit = NULL;
1801: struct sshbuf *exts = NULL, *ca = NULL;
1802: u_char *sig = NULL;
1803: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1804: int ret = SSH_ERR_INTERNAL_ERROR;
1805:
1806: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1807: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1808: return ret;
1809:
1.20 djm 1810: /* Parse body of certificate up to signature */
1811: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1812: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1813: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1814: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1815: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1816: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1817: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1818: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1819: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1820: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1821: /* XXX debug print error for ret */
1822: ret = SSH_ERR_INVALID_FORMAT;
1823: goto out;
1824: }
1825:
1826: /* Signature is left in the buffer so we can calculate this length */
1827: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1828:
1829: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1830: ret = SSH_ERR_INVALID_FORMAT;
1831: goto out;
1832: }
1833:
1834: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1835: key->cert->type != SSH2_CERT_TYPE_HOST) {
1836: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1837: goto out;
1838: }
1839:
1.4 djm 1840: /* Parse principals section */
1841: while (sshbuf_len(principals) > 0) {
1842: char *principal = NULL;
1843: char **oprincipals = NULL;
1844:
1.1 djm 1845: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1846: ret = SSH_ERR_INVALID_FORMAT;
1847: goto out;
1848: }
1.4 djm 1849: if ((ret = sshbuf_get_cstring(principals, &principal,
1850: NULL)) != 0) {
1.1 djm 1851: ret = SSH_ERR_INVALID_FORMAT;
1852: goto out;
1853: }
1854: oprincipals = key->cert->principals;
1.20 djm 1855: key->cert->principals = reallocarray(key->cert->principals,
1856: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1.1 djm 1857: if (key->cert->principals == NULL) {
1858: free(principal);
1859: key->cert->principals = oprincipals;
1860: ret = SSH_ERR_ALLOC_FAIL;
1861: goto out;
1862: }
1863: key->cert->principals[key->cert->nprincipals++] = principal;
1864: }
1865:
1.4 djm 1866: /*
1867: * Stash a copies of the critical options and extensions sections
1868: * for later use.
1869: */
1870: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1871: (exts != NULL &&
1872: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1873: goto out;
1874:
1.4 djm 1875: /*
1876: * Validate critical options and extensions sections format.
1877: */
1878: while (sshbuf_len(crit) != 0) {
1879: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1880: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1881: sshbuf_reset(key->cert->critical);
1.1 djm 1882: ret = SSH_ERR_INVALID_FORMAT;
1883: goto out;
1884: }
1885: }
1.4 djm 1886: while (exts != NULL && sshbuf_len(exts) != 0) {
1887: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1888: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1889: sshbuf_reset(key->cert->extensions);
1.1 djm 1890: ret = SSH_ERR_INVALID_FORMAT;
1891: goto out;
1892: }
1893: }
1894:
1.4 djm 1895: /* Parse CA key and check signature */
1.14 djm 1896: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1897: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1898: goto out;
1899: }
1900: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1901: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1902: goto out;
1903: }
1904: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1905: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1906: goto out;
1.4 djm 1907:
1908: /* Success */
1.1 djm 1909: ret = 0;
1910: out:
1.14 djm 1911: sshbuf_free(ca);
1.4 djm 1912: sshbuf_free(crit);
1913: sshbuf_free(exts);
1914: sshbuf_free(principals);
1.1 djm 1915: free(sig);
1916: return ret;
1917: }
1918:
1919: static int
1.14 djm 1920: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1921: int allow_cert)
1.1 djm 1922: {
1.12 djm 1923: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1924: char *ktype = NULL, *curve = NULL;
1925: struct sshkey *key = NULL;
1926: size_t len;
1927: u_char *pk = NULL;
1.14 djm 1928: struct sshbuf *copy;
1.1 djm 1929: #ifdef WITH_OPENSSL
1930: EC_POINT *q = NULL;
1931: #endif /* WITH_OPENSSL */
1932:
1933: #ifdef DEBUG_PK /* XXX */
1.14 djm 1934: sshbuf_dump(b, stderr);
1.1 djm 1935: #endif
1936: *keyp = NULL;
1.14 djm 1937: if ((copy = sshbuf_fromb(b)) == NULL) {
1938: ret = SSH_ERR_ALLOC_FAIL;
1939: goto out;
1940: }
1.1 djm 1941: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1942: ret = SSH_ERR_INVALID_FORMAT;
1943: goto out;
1944: }
1945:
1946: type = sshkey_type_from_name(ktype);
1947: if (!allow_cert && sshkey_type_is_cert(type)) {
1948: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1949: goto out;
1950: }
1951: switch (type) {
1952: #ifdef WITH_OPENSSL
1953: case KEY_RSA_CERT:
1.14 djm 1954: /* Skip nonce */
1.1 djm 1955: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1956: ret = SSH_ERR_INVALID_FORMAT;
1957: goto out;
1958: }
1959: /* FALLTHROUGH */
1960: case KEY_RSA:
1961: if ((key = sshkey_new(type)) == NULL) {
1962: ret = SSH_ERR_ALLOC_FAIL;
1963: goto out;
1964: }
1.16 djm 1965: if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
1966: sshbuf_get_bignum2(b, key->rsa->n) != 0) {
1.1 djm 1967: ret = SSH_ERR_INVALID_FORMAT;
1968: goto out;
1969: }
1970: #ifdef DEBUG_PK
1971: RSA_print_fp(stderr, key->rsa, 8);
1972: #endif
1973: break;
1974: case KEY_DSA_CERT:
1.14 djm 1975: /* Skip nonce */
1.1 djm 1976: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1977: ret = SSH_ERR_INVALID_FORMAT;
1978: goto out;
1979: }
1980: /* FALLTHROUGH */
1981: case KEY_DSA:
1982: if ((key = sshkey_new(type)) == NULL) {
1983: ret = SSH_ERR_ALLOC_FAIL;
1984: goto out;
1985: }
1.16 djm 1986: if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
1987: sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
1988: sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
1989: sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
1.1 djm 1990: ret = SSH_ERR_INVALID_FORMAT;
1991: goto out;
1992: }
1993: #ifdef DEBUG_PK
1994: DSA_print_fp(stderr, key->dsa, 8);
1995: #endif
1996: break;
1997: case KEY_ECDSA_CERT:
1.14 djm 1998: /* Skip nonce */
1.1 djm 1999: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2000: ret = SSH_ERR_INVALID_FORMAT;
2001: goto out;
2002: }
2003: /* FALLTHROUGH */
2004: case KEY_ECDSA:
2005: if ((key = sshkey_new(type)) == NULL) {
2006: ret = SSH_ERR_ALLOC_FAIL;
2007: goto out;
2008: }
1.12 djm 2009: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2010: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2011: ret = SSH_ERR_INVALID_FORMAT;
2012: goto out;
2013: }
2014: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2015: ret = SSH_ERR_EC_CURVE_MISMATCH;
2016: goto out;
2017: }
2018: if (key->ecdsa != NULL)
2019: EC_KEY_free(key->ecdsa);
2020: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2021: == NULL) {
2022: ret = SSH_ERR_EC_CURVE_INVALID;
2023: goto out;
2024: }
2025: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2026: ret = SSH_ERR_ALLOC_FAIL;
2027: goto out;
2028: }
2029: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2030: ret = SSH_ERR_INVALID_FORMAT;
2031: goto out;
2032: }
2033: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2034: q) != 0) {
2035: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2036: goto out;
2037: }
2038: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2039: /* XXX assume it is a allocation error */
2040: ret = SSH_ERR_ALLOC_FAIL;
2041: goto out;
2042: }
2043: #ifdef DEBUG_PK
2044: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2045: #endif
2046: break;
2047: #endif /* WITH_OPENSSL */
2048: case KEY_ED25519_CERT:
1.14 djm 2049: /* Skip nonce */
1.1 djm 2050: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2051: ret = SSH_ERR_INVALID_FORMAT;
2052: goto out;
2053: }
2054: /* FALLTHROUGH */
2055: case KEY_ED25519:
2056: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2057: goto out;
2058: if (len != ED25519_PK_SZ) {
2059: ret = SSH_ERR_INVALID_FORMAT;
2060: goto out;
2061: }
2062: if ((key = sshkey_new(type)) == NULL) {
2063: ret = SSH_ERR_ALLOC_FAIL;
2064: goto out;
2065: }
2066: key->ed25519_pk = pk;
2067: pk = NULL;
2068: break;
2069: case KEY_UNSPEC:
2070: if ((key = sshkey_new(type)) == NULL) {
2071: ret = SSH_ERR_ALLOC_FAIL;
2072: goto out;
2073: }
2074: break;
2075: default:
2076: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2077: goto out;
2078: }
2079:
2080: /* Parse certificate potion */
1.14 djm 2081: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2082: goto out;
2083:
2084: if (key != NULL && sshbuf_len(b) != 0) {
2085: ret = SSH_ERR_INVALID_FORMAT;
2086: goto out;
2087: }
2088: ret = 0;
2089: *keyp = key;
2090: key = NULL;
2091: out:
1.14 djm 2092: sshbuf_free(copy);
1.1 djm 2093: sshkey_free(key);
2094: free(ktype);
2095: free(curve);
2096: free(pk);
2097: #ifdef WITH_OPENSSL
2098: if (q != NULL)
2099: EC_POINT_free(q);
2100: #endif /* WITH_OPENSSL */
2101: return ret;
2102: }
2103:
2104: int
2105: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2106: {
1.14 djm 2107: struct sshbuf *b;
2108: int r;
2109:
2110: if ((b = sshbuf_from(blob, blen)) == NULL)
2111: return SSH_ERR_ALLOC_FAIL;
2112: r = sshkey_from_blob_internal(b, keyp, 1);
2113: sshbuf_free(b);
2114: return r;
2115: }
2116:
2117: int
2118: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2119: {
2120: return sshkey_from_blob_internal(b, keyp, 1);
2121: }
2122:
2123: int
2124: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2125: {
2126: struct sshbuf *b;
2127: int r;
2128:
2129: if ((r = sshbuf_froms(buf, &b)) != 0)
2130: return r;
2131: r = sshkey_from_blob_internal(b, keyp, 1);
2132: sshbuf_free(b);
2133: return r;
1.1 djm 2134: }
2135:
2136: int
2137: sshkey_sign(const struct sshkey *key,
2138: u_char **sigp, size_t *lenp,
2139: const u_char *data, size_t datalen, u_int compat)
2140: {
2141: if (sigp != NULL)
2142: *sigp = NULL;
2143: if (lenp != NULL)
2144: *lenp = 0;
2145: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2146: return SSH_ERR_INVALID_ARGUMENT;
2147: switch (key->type) {
2148: #ifdef WITH_OPENSSL
2149: case KEY_DSA_CERT:
2150: case KEY_DSA:
2151: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2152: case KEY_ECDSA_CERT:
2153: case KEY_ECDSA:
2154: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2155: case KEY_RSA_CERT:
2156: case KEY_RSA:
2157: return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2158: #endif /* WITH_OPENSSL */
2159: case KEY_ED25519:
2160: case KEY_ED25519_CERT:
2161: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2162: default:
2163: return SSH_ERR_KEY_TYPE_UNKNOWN;
2164: }
2165: }
2166:
2167: /*
2168: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2169: */
2170: int
2171: sshkey_verify(const struct sshkey *key,
2172: const u_char *sig, size_t siglen,
2173: const u_char *data, size_t dlen, u_int compat)
2174: {
1.6 djm 2175: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2176: return SSH_ERR_INVALID_ARGUMENT;
2177: switch (key->type) {
2178: #ifdef WITH_OPENSSL
2179: case KEY_DSA_CERT:
2180: case KEY_DSA:
2181: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2182: case KEY_ECDSA_CERT:
2183: case KEY_ECDSA:
2184: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2185: case KEY_RSA_CERT:
2186: case KEY_RSA:
2187: return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2188: #endif /* WITH_OPENSSL */
2189: case KEY_ED25519:
2190: case KEY_ED25519_CERT:
2191: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2192: default:
2193: return SSH_ERR_KEY_TYPE_UNKNOWN;
2194: }
2195: }
2196:
2197: /* Converts a private to a public key */
2198: int
2199: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2200: {
2201: struct sshkey *pk;
2202: int ret = SSH_ERR_INTERNAL_ERROR;
2203:
1.24 djm 2204: *dkp = NULL;
1.1 djm 2205: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2206: return SSH_ERR_ALLOC_FAIL;
2207: pk->type = k->type;
2208: pk->flags = k->flags;
2209: pk->ecdsa_nid = k->ecdsa_nid;
2210: pk->dsa = NULL;
2211: pk->ecdsa = NULL;
2212: pk->rsa = NULL;
2213: pk->ed25519_pk = NULL;
2214: pk->ed25519_sk = NULL;
2215:
2216: switch (k->type) {
2217: #ifdef WITH_OPENSSL
2218: case KEY_RSA_CERT:
2219: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2220: goto fail;
2221: /* FALLTHROUGH */
2222: case KEY_RSA1:
2223: case KEY_RSA:
2224: if ((pk->rsa = RSA_new()) == NULL ||
2225: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2226: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2227: ret = SSH_ERR_ALLOC_FAIL;
2228: goto fail;
2229: }
2230: break;
2231: case KEY_DSA_CERT:
2232: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2233: goto fail;
2234: /* FALLTHROUGH */
2235: case KEY_DSA:
2236: if ((pk->dsa = DSA_new()) == NULL ||
2237: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2238: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2239: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2240: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2241: ret = SSH_ERR_ALLOC_FAIL;
2242: goto fail;
2243: }
2244: break;
2245: case KEY_ECDSA_CERT:
2246: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2247: goto fail;
2248: /* FALLTHROUGH */
2249: case KEY_ECDSA:
2250: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2251: if (pk->ecdsa == NULL) {
2252: ret = SSH_ERR_ALLOC_FAIL;
2253: goto fail;
2254: }
2255: if (EC_KEY_set_public_key(pk->ecdsa,
2256: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2257: ret = SSH_ERR_LIBCRYPTO_ERROR;
2258: goto fail;
2259: }
2260: break;
2261: #endif /* WITH_OPENSSL */
2262: case KEY_ED25519_CERT:
2263: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2264: goto fail;
2265: /* FALLTHROUGH */
2266: case KEY_ED25519:
2267: if (k->ed25519_pk != NULL) {
2268: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2269: ret = SSH_ERR_ALLOC_FAIL;
2270: goto fail;
2271: }
2272: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2273: }
2274: break;
2275: default:
2276: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2277: fail:
2278: sshkey_free(pk);
2279: return ret;
2280: }
2281: *dkp = pk;
2282: return 0;
2283: }
2284:
2285: /* Convert a plain key to their _CERT equivalent */
2286: int
1.20 djm 2287: sshkey_to_certified(struct sshkey *k)
1.1 djm 2288: {
2289: int newtype;
2290:
2291: switch (k->type) {
2292: #ifdef WITH_OPENSSL
2293: case KEY_RSA:
1.20 djm 2294: newtype = KEY_RSA_CERT;
1.1 djm 2295: break;
2296: case KEY_DSA:
1.20 djm 2297: newtype = KEY_DSA_CERT;
1.1 djm 2298: break;
2299: case KEY_ECDSA:
2300: newtype = KEY_ECDSA_CERT;
2301: break;
2302: #endif /* WITH_OPENSSL */
2303: case KEY_ED25519:
2304: newtype = KEY_ED25519_CERT;
2305: break;
2306: default:
2307: return SSH_ERR_INVALID_ARGUMENT;
2308: }
2309: if ((k->cert = cert_new()) == NULL)
2310: return SSH_ERR_ALLOC_FAIL;
2311: k->type = newtype;
2312: return 0;
2313: }
2314:
2315: /* Convert a certificate to its raw key equivalent */
2316: int
2317: sshkey_drop_cert(struct sshkey *k)
2318: {
2319: if (!sshkey_type_is_cert(k->type))
2320: return SSH_ERR_KEY_TYPE_UNKNOWN;
2321: cert_free(k->cert);
2322: k->cert = NULL;
2323: k->type = sshkey_type_plain(k->type);
2324: return 0;
2325: }
2326:
2327: /* Sign a certified key, (re-)generating the signed certblob. */
2328: int
2329: sshkey_certify(struct sshkey *k, struct sshkey *ca)
2330: {
2331: struct sshbuf *principals = NULL;
2332: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2333: size_t i, ca_len, sig_len;
2334: int ret = SSH_ERR_INTERNAL_ERROR;
2335: struct sshbuf *cert;
2336:
2337: if (k == NULL || k->cert == NULL ||
2338: k->cert->certblob == NULL || ca == NULL)
2339: return SSH_ERR_INVALID_ARGUMENT;
2340: if (!sshkey_is_cert(k))
2341: return SSH_ERR_KEY_TYPE_UNKNOWN;
2342: if (!sshkey_type_is_valid_ca(ca->type))
2343: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2344:
2345: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2346: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2347:
2348: cert = k->cert->certblob; /* for readability */
2349: sshbuf_reset(cert);
2350: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2351: goto out;
2352:
2353: /* -v01 certs put nonce first */
2354: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2355: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2356: goto out;
1.1 djm 2357:
2358: /* XXX this substantially duplicates to_blob(); refactor */
2359: switch (k->type) {
2360: #ifdef WITH_OPENSSL
2361: case KEY_DSA_CERT:
2362: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2363: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2364: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2365: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2366: goto out;
2367: break;
2368: case KEY_ECDSA_CERT:
2369: if ((ret = sshbuf_put_cstring(cert,
2370: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2371: (ret = sshbuf_put_ec(cert,
2372: EC_KEY_get0_public_key(k->ecdsa),
2373: EC_KEY_get0_group(k->ecdsa))) != 0)
2374: goto out;
2375: break;
2376: case KEY_RSA_CERT:
2377: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2378: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2379: goto out;
2380: break;
2381: #endif /* WITH_OPENSSL */
2382: case KEY_ED25519_CERT:
2383: if ((ret = sshbuf_put_string(cert,
2384: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2385: goto out;
2386: break;
2387: default:
2388: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2389: goto out;
1.1 djm 2390: }
2391:
1.20 djm 2392: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2393: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2394: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2395: goto out;
2396:
2397: if ((principals = sshbuf_new()) == NULL) {
2398: ret = SSH_ERR_ALLOC_FAIL;
2399: goto out;
2400: }
2401: for (i = 0; i < k->cert->nprincipals; i++) {
2402: if ((ret = sshbuf_put_cstring(principals,
2403: k->cert->principals[i])) != 0)
2404: goto out;
2405: }
2406: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2407: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2408: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2409: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2410: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2411: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2412: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2413: goto out;
2414:
2415: /* Sign the whole mess */
2416: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2417: sshbuf_len(cert), 0)) != 0)
2418: goto out;
2419:
2420: /* Append signature and we are done */
2421: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2422: goto out;
2423: ret = 0;
2424: out:
2425: if (ret != 0)
2426: sshbuf_reset(cert);
2427: if (sig_blob != NULL)
2428: free(sig_blob);
2429: if (ca_blob != NULL)
2430: free(ca_blob);
2431: if (principals != NULL)
2432: sshbuf_free(principals);
2433: return ret;
2434: }
2435:
2436: int
2437: sshkey_cert_check_authority(const struct sshkey *k,
2438: int want_host, int require_principal,
2439: const char *name, const char **reason)
2440: {
2441: u_int i, principal_matches;
2442: time_t now = time(NULL);
2443:
2444: if (reason != NULL)
2445: *reason = NULL;
2446:
2447: if (want_host) {
2448: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2449: *reason = "Certificate invalid: not a host certificate";
2450: return SSH_ERR_KEY_CERT_INVALID;
2451: }
2452: } else {
2453: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2454: *reason = "Certificate invalid: not a user certificate";
2455: return SSH_ERR_KEY_CERT_INVALID;
2456: }
2457: }
2458: if (now < 0) {
2459: /* yikes - system clock before epoch! */
2460: *reason = "Certificate invalid: not yet valid";
2461: return SSH_ERR_KEY_CERT_INVALID;
2462: }
2463: if ((u_int64_t)now < k->cert->valid_after) {
2464: *reason = "Certificate invalid: not yet valid";
2465: return SSH_ERR_KEY_CERT_INVALID;
2466: }
2467: if ((u_int64_t)now >= k->cert->valid_before) {
2468: *reason = "Certificate invalid: expired";
2469: return SSH_ERR_KEY_CERT_INVALID;
2470: }
2471: if (k->cert->nprincipals == 0) {
2472: if (require_principal) {
2473: *reason = "Certificate lacks principal list";
2474: return SSH_ERR_KEY_CERT_INVALID;
2475: }
2476: } else if (name != NULL) {
2477: principal_matches = 0;
2478: for (i = 0; i < k->cert->nprincipals; i++) {
2479: if (strcmp(name, k->cert->principals[i]) == 0) {
2480: principal_matches = 1;
2481: break;
2482: }
2483: }
2484: if (!principal_matches) {
2485: *reason = "Certificate invalid: name is not a listed "
2486: "principal";
2487: return SSH_ERR_KEY_CERT_INVALID;
2488: }
2489: }
2490: return 0;
1.27 ! djm 2491: }
! 2492:
! 2493: size_t
! 2494: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
! 2495: {
! 2496: char from[32], to[32], ret[64];
! 2497: time_t tt;
! 2498: struct tm *tm;
! 2499:
! 2500: *from = *to = '\0';
! 2501: if (cert->valid_after == 0 &&
! 2502: cert->valid_before == 0xffffffffffffffffULL)
! 2503: return strlcpy(s, "forever", l);
! 2504:
! 2505: if (cert->valid_after != 0) {
! 2506: /* XXX revisit INT_MAX in 2038 :) */
! 2507: tt = cert->valid_after > INT_MAX ?
! 2508: INT_MAX : cert->valid_after;
! 2509: tm = localtime(&tt);
! 2510: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
! 2511: }
! 2512: if (cert->valid_before != 0xffffffffffffffffULL) {
! 2513: /* XXX revisit INT_MAX in 2038 :) */
! 2514: tt = cert->valid_before > INT_MAX ?
! 2515: INT_MAX : cert->valid_before;
! 2516: tm = localtime(&tt);
! 2517: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
! 2518: }
! 2519:
! 2520: if (cert->valid_after == 0)
! 2521: snprintf(ret, sizeof(ret), "before %s", to);
! 2522: else if (cert->valid_before == 0xffffffffffffffffULL)
! 2523: snprintf(ret, sizeof(ret), "after %s", from);
! 2524: else
! 2525: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
! 2526:
! 2527: return strlcpy(s, ret, l);
1.1 djm 2528: }
2529:
2530: int
2531: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2532: {
2533: int r = SSH_ERR_INTERNAL_ERROR;
2534:
2535: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2536: goto out;
2537: switch (key->type) {
2538: #ifdef WITH_OPENSSL
2539: case KEY_RSA:
2540: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2541: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2542: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2543: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2544: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2545: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2546: goto out;
2547: break;
2548: case KEY_RSA_CERT:
2549: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2550: r = SSH_ERR_INVALID_ARGUMENT;
2551: goto out;
2552: }
2553: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2554: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2555: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2556: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2557: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2558: goto out;
2559: break;
2560: case KEY_DSA:
2561: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2562: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2563: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2564: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2565: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2566: goto out;
2567: break;
2568: case KEY_DSA_CERT:
2569: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2570: r = SSH_ERR_INVALID_ARGUMENT;
2571: goto out;
2572: }
2573: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2574: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2575: goto out;
2576: break;
2577: case KEY_ECDSA:
2578: if ((r = sshbuf_put_cstring(b,
2579: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2580: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2581: (r = sshbuf_put_bignum2(b,
2582: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2583: goto out;
2584: break;
2585: case KEY_ECDSA_CERT:
2586: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2587: r = SSH_ERR_INVALID_ARGUMENT;
2588: goto out;
2589: }
2590: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2591: (r = sshbuf_put_bignum2(b,
2592: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2593: goto out;
2594: break;
2595: #endif /* WITH_OPENSSL */
2596: case KEY_ED25519:
2597: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2598: ED25519_PK_SZ)) != 0 ||
2599: (r = sshbuf_put_string(b, key->ed25519_sk,
2600: ED25519_SK_SZ)) != 0)
2601: goto out;
2602: break;
2603: case KEY_ED25519_CERT:
2604: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2605: r = SSH_ERR_INVALID_ARGUMENT;
2606: goto out;
2607: }
2608: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2609: (r = sshbuf_put_string(b, key->ed25519_pk,
2610: ED25519_PK_SZ)) != 0 ||
2611: (r = sshbuf_put_string(b, key->ed25519_sk,
2612: ED25519_SK_SZ)) != 0)
2613: goto out;
2614: break;
2615: default:
2616: r = SSH_ERR_INVALID_ARGUMENT;
2617: goto out;
2618: }
2619: /* success */
2620: r = 0;
2621: out:
2622: return r;
2623: }
2624:
2625: int
2626: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2627: {
2628: char *tname = NULL, *curve = NULL;
2629: struct sshkey *k = NULL;
1.14 djm 2630: size_t pklen = 0, sklen = 0;
1.1 djm 2631: int type, r = SSH_ERR_INTERNAL_ERROR;
2632: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2633: #ifdef WITH_OPENSSL
2634: BIGNUM *exponent = NULL;
2635: #endif /* WITH_OPENSSL */
2636:
2637: if (kp != NULL)
2638: *kp = NULL;
2639: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2640: goto out;
2641: type = sshkey_type_from_name(tname);
2642: switch (type) {
2643: #ifdef WITH_OPENSSL
2644: case KEY_DSA:
2645: if ((k = sshkey_new_private(type)) == NULL) {
2646: r = SSH_ERR_ALLOC_FAIL;
2647: goto out;
2648: }
2649: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2650: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2651: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2652: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2653: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2654: goto out;
2655: break;
2656: case KEY_DSA_CERT:
1.14 djm 2657: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2658: (r = sshkey_add_private(k)) != 0 ||
2659: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2660: goto out;
2661: break;
2662: case KEY_ECDSA:
2663: if ((k = sshkey_new_private(type)) == NULL) {
2664: r = SSH_ERR_ALLOC_FAIL;
2665: goto out;
2666: }
2667: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2668: r = SSH_ERR_INVALID_ARGUMENT;
2669: goto out;
2670: }
2671: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2672: goto out;
2673: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2674: r = SSH_ERR_EC_CURVE_MISMATCH;
2675: goto out;
2676: }
2677: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2678: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2679: r = SSH_ERR_LIBCRYPTO_ERROR;
2680: goto out;
2681: }
2682: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2683: (r = sshbuf_get_bignum2(buf, exponent)))
2684: goto out;
2685: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2686: r = SSH_ERR_LIBCRYPTO_ERROR;
2687: goto out;
2688: }
2689: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2690: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2691: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2692: goto out;
2693: break;
2694: case KEY_ECDSA_CERT:
2695: if ((exponent = BN_new()) == NULL) {
2696: r = SSH_ERR_LIBCRYPTO_ERROR;
2697: goto out;
2698: }
1.14 djm 2699: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2700: (r = sshkey_add_private(k)) != 0 ||
2701: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2702: goto out;
2703: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2704: r = SSH_ERR_LIBCRYPTO_ERROR;
2705: goto out;
2706: }
2707: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2708: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2709: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2710: goto out;
2711: break;
2712: case KEY_RSA:
2713: if ((k = sshkey_new_private(type)) == NULL) {
2714: r = SSH_ERR_ALLOC_FAIL;
2715: goto out;
2716: }
2717: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2718: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2719: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2720: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2721: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2722: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2723: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2724: goto out;
2725: break;
2726: case KEY_RSA_CERT:
1.14 djm 2727: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2728: (r = sshkey_add_private(k)) != 0 ||
1.22 jsg 2729: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2730: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2731: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2732: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
1.1 djm 2733: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2734: goto out;
2735: break;
2736: #endif /* WITH_OPENSSL */
2737: case KEY_ED25519:
2738: if ((k = sshkey_new_private(type)) == NULL) {
2739: r = SSH_ERR_ALLOC_FAIL;
2740: goto out;
2741: }
2742: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2743: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2744: goto out;
2745: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2746: r = SSH_ERR_INVALID_FORMAT;
2747: goto out;
2748: }
2749: k->ed25519_pk = ed25519_pk;
2750: k->ed25519_sk = ed25519_sk;
2751: ed25519_pk = ed25519_sk = NULL;
2752: break;
2753: case KEY_ED25519_CERT:
1.14 djm 2754: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2755: (r = sshkey_add_private(k)) != 0 ||
2756: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2757: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2758: goto out;
2759: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2760: r = SSH_ERR_INVALID_FORMAT;
2761: goto out;
2762: }
2763: k->ed25519_pk = ed25519_pk;
2764: k->ed25519_sk = ed25519_sk;
2765: ed25519_pk = ed25519_sk = NULL;
2766: break;
2767: default:
2768: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2769: goto out;
2770: }
2771: #ifdef WITH_OPENSSL
2772: /* enable blinding */
2773: switch (k->type) {
2774: case KEY_RSA:
2775: case KEY_RSA_CERT:
2776: case KEY_RSA1:
2777: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2778: r = SSH_ERR_LIBCRYPTO_ERROR;
2779: goto out;
2780: }
2781: break;
2782: }
2783: #endif /* WITH_OPENSSL */
2784: /* success */
2785: r = 0;
2786: if (kp != NULL) {
2787: *kp = k;
2788: k = NULL;
2789: }
2790: out:
2791: free(tname);
2792: free(curve);
2793: #ifdef WITH_OPENSSL
2794: if (exponent != NULL)
2795: BN_clear_free(exponent);
2796: #endif /* WITH_OPENSSL */
2797: sshkey_free(k);
2798: if (ed25519_pk != NULL) {
2799: explicit_bzero(ed25519_pk, pklen);
2800: free(ed25519_pk);
2801: }
2802: if (ed25519_sk != NULL) {
2803: explicit_bzero(ed25519_sk, sklen);
2804: free(ed25519_sk);
2805: }
2806: return r;
2807: }
2808:
2809: #ifdef WITH_OPENSSL
2810: int
2811: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2812: {
2813: BN_CTX *bnctx;
2814: EC_POINT *nq = NULL;
2815: BIGNUM *order, *x, *y, *tmp;
2816: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2817:
2818: if ((bnctx = BN_CTX_new()) == NULL)
2819: return SSH_ERR_ALLOC_FAIL;
2820: BN_CTX_start(bnctx);
2821:
2822: /*
2823: * We shouldn't ever hit this case because bignum_get_ecpoint()
2824: * refuses to load GF2m points.
2825: */
2826: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2827: NID_X9_62_prime_field)
2828: goto out;
2829:
2830: /* Q != infinity */
2831: if (EC_POINT_is_at_infinity(group, public))
2832: goto out;
2833:
2834: if ((x = BN_CTX_get(bnctx)) == NULL ||
2835: (y = BN_CTX_get(bnctx)) == NULL ||
2836: (order = BN_CTX_get(bnctx)) == NULL ||
2837: (tmp = BN_CTX_get(bnctx)) == NULL) {
2838: ret = SSH_ERR_ALLOC_FAIL;
2839: goto out;
2840: }
2841:
2842: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2843: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2844: EC_POINT_get_affine_coordinates_GFp(group, public,
2845: x, y, bnctx) != 1) {
2846: ret = SSH_ERR_LIBCRYPTO_ERROR;
2847: goto out;
2848: }
2849: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2850: BN_num_bits(y) <= BN_num_bits(order) / 2)
2851: goto out;
2852:
2853: /* nQ == infinity (n == order of subgroup) */
2854: if ((nq = EC_POINT_new(group)) == NULL) {
2855: ret = SSH_ERR_ALLOC_FAIL;
2856: goto out;
2857: }
2858: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2859: ret = SSH_ERR_LIBCRYPTO_ERROR;
2860: goto out;
2861: }
2862: if (EC_POINT_is_at_infinity(group, nq) != 1)
2863: goto out;
2864:
2865: /* x < order - 1, y < order - 1 */
2866: if (!BN_sub(tmp, order, BN_value_one())) {
2867: ret = SSH_ERR_LIBCRYPTO_ERROR;
2868: goto out;
2869: }
2870: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2871: goto out;
2872: ret = 0;
2873: out:
2874: BN_CTX_free(bnctx);
2875: if (nq != NULL)
2876: EC_POINT_free(nq);
2877: return ret;
2878: }
2879:
2880: int
2881: sshkey_ec_validate_private(const EC_KEY *key)
2882: {
2883: BN_CTX *bnctx;
2884: BIGNUM *order, *tmp;
2885: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2886:
2887: if ((bnctx = BN_CTX_new()) == NULL)
2888: return SSH_ERR_ALLOC_FAIL;
2889: BN_CTX_start(bnctx);
2890:
2891: if ((order = BN_CTX_get(bnctx)) == NULL ||
2892: (tmp = BN_CTX_get(bnctx)) == NULL) {
2893: ret = SSH_ERR_ALLOC_FAIL;
2894: goto out;
2895: }
2896:
2897: /* log2(private) > log2(order)/2 */
2898: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2899: ret = SSH_ERR_LIBCRYPTO_ERROR;
2900: goto out;
2901: }
2902: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2903: BN_num_bits(order) / 2)
2904: goto out;
2905:
2906: /* private < order - 1 */
2907: if (!BN_sub(tmp, order, BN_value_one())) {
2908: ret = SSH_ERR_LIBCRYPTO_ERROR;
2909: goto out;
2910: }
2911: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2912: goto out;
2913: ret = 0;
2914: out:
2915: BN_CTX_free(bnctx);
2916: return ret;
2917: }
2918:
2919: void
2920: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2921: {
2922: BIGNUM *x, *y;
2923: BN_CTX *bnctx;
2924:
2925: if (point == NULL) {
2926: fputs("point=(NULL)\n", stderr);
2927: return;
2928: }
2929: if ((bnctx = BN_CTX_new()) == NULL) {
2930: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2931: return;
2932: }
2933: BN_CTX_start(bnctx);
2934: if ((x = BN_CTX_get(bnctx)) == NULL ||
2935: (y = BN_CTX_get(bnctx)) == NULL) {
2936: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2937: return;
2938: }
2939: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2940: NID_X9_62_prime_field) {
2941: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2942: return;
2943: }
2944: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2945: bnctx) != 1) {
2946: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2947: __func__);
2948: return;
2949: }
2950: fputs("x=", stderr);
2951: BN_print_fp(stderr, x);
2952: fputs("\ny=", stderr);
2953: BN_print_fp(stderr, y);
2954: fputs("\n", stderr);
2955: BN_CTX_free(bnctx);
2956: }
2957:
2958: void
2959: sshkey_dump_ec_key(const EC_KEY *key)
2960: {
2961: const BIGNUM *exponent;
2962:
2963: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2964: EC_KEY_get0_public_key(key));
2965: fputs("exponent=", stderr);
2966: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2967: fputs("(NULL)", stderr);
2968: else
2969: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2970: fputs("\n", stderr);
2971: }
2972: #endif /* WITH_OPENSSL */
2973:
2974: static int
2975: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2976: const char *passphrase, const char *comment, const char *ciphername,
2977: int rounds)
2978: {
1.4 djm 2979: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2980: u_char salt[SALT_LEN];
1.4 djm 2981: char *b64 = NULL;
1.1 djm 2982: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2983: u_int check;
2984: int r = SSH_ERR_INTERNAL_ERROR;
2985: struct sshcipher_ctx ciphercontext;
2986: const struct sshcipher *cipher;
2987: const char *kdfname = KDFNAME;
2988: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2989:
2990: memset(&ciphercontext, 0, sizeof(ciphercontext));
2991:
2992: if (rounds <= 0)
2993: rounds = DEFAULT_ROUNDS;
2994: if (passphrase == NULL || !strlen(passphrase)) {
2995: ciphername = "none";
2996: kdfname = "none";
2997: } else if (ciphername == NULL)
2998: ciphername = DEFAULT_CIPHERNAME;
2999: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
3000: r = SSH_ERR_INVALID_ARGUMENT;
3001: goto out;
3002: }
3003: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3004: r = SSH_ERR_INTERNAL_ERROR;
3005: goto out;
3006: }
3007:
3008: if ((kdf = sshbuf_new()) == NULL ||
3009: (encoded = sshbuf_new()) == NULL ||
3010: (encrypted = sshbuf_new()) == NULL) {
3011: r = SSH_ERR_ALLOC_FAIL;
3012: goto out;
3013: }
3014: blocksize = cipher_blocksize(cipher);
3015: keylen = cipher_keylen(cipher);
3016: ivlen = cipher_ivlen(cipher);
3017: authlen = cipher_authlen(cipher);
3018: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3019: r = SSH_ERR_ALLOC_FAIL;
3020: goto out;
3021: }
3022: if (strcmp(kdfname, "bcrypt") == 0) {
3023: arc4random_buf(salt, SALT_LEN);
3024: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3025: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3026: r = SSH_ERR_INVALID_ARGUMENT;
3027: goto out;
3028: }
3029: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3030: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3031: goto out;
3032: } else if (strcmp(kdfname, "none") != 0) {
3033: /* Unsupported KDF type */
3034: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3035: goto out;
3036: }
3037: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3038: key + keylen, ivlen, 1)) != 0)
3039: goto out;
3040:
3041: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3042: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3043: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3044: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3045: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3046: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3047: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3048: goto out;
3049:
3050: /* set up the buffer that will be encrypted */
3051:
3052: /* Random check bytes */
3053: check = arc4random();
3054: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3055: (r = sshbuf_put_u32(encrypted, check)) != 0)
3056: goto out;
3057:
3058: /* append private key and comment*/
3059: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3060: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3061: goto out;
3062:
3063: /* padding */
3064: i = 0;
3065: while (sshbuf_len(encrypted) % blocksize) {
3066: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3067: goto out;
3068: }
3069:
3070: /* length in destination buffer */
3071: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3072: goto out;
3073:
3074: /* encrypt */
3075: if ((r = sshbuf_reserve(encoded,
3076: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3077: goto out;
3078: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3079: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3080: goto out;
3081:
3082: /* uuencode */
3083: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3084: r = SSH_ERR_ALLOC_FAIL;
3085: goto out;
3086: }
3087:
3088: sshbuf_reset(blob);
3089: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3090: goto out;
3091: for (i = 0; i < strlen(b64); i++) {
3092: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3093: goto out;
3094: /* insert line breaks */
3095: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3096: goto out;
3097: }
3098: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3099: goto out;
3100: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3101: goto out;
3102:
3103: /* success */
3104: r = 0;
3105:
3106: out:
3107: sshbuf_free(kdf);
3108: sshbuf_free(encoded);
3109: sshbuf_free(encrypted);
3110: cipher_cleanup(&ciphercontext);
3111: explicit_bzero(salt, sizeof(salt));
3112: if (key != NULL) {
3113: explicit_bzero(key, keylen + ivlen);
3114: free(key);
3115: }
3116: if (pubkeyblob != NULL) {
3117: explicit_bzero(pubkeyblob, pubkeylen);
3118: free(pubkeyblob);
3119: }
3120: if (b64 != NULL) {
3121: explicit_bzero(b64, strlen(b64));
3122: free(b64);
3123: }
3124: return r;
3125: }
3126:
3127: static int
3128: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3129: struct sshkey **keyp, char **commentp)
3130: {
3131: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3132: const struct sshcipher *cipher = NULL;
3133: const u_char *cp;
3134: int r = SSH_ERR_INTERNAL_ERROR;
3135: size_t encoded_len;
1.18 djm 3136: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3137: struct sshbuf *encoded = NULL, *decoded = NULL;
3138: struct sshbuf *kdf = NULL, *decrypted = NULL;
3139: struct sshcipher_ctx ciphercontext;
3140: struct sshkey *k = NULL;
3141: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3142: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3143:
3144: memset(&ciphercontext, 0, sizeof(ciphercontext));
3145: if (keyp != NULL)
3146: *keyp = NULL;
3147: if (commentp != NULL)
3148: *commentp = NULL;
3149:
3150: if ((encoded = sshbuf_new()) == NULL ||
3151: (decoded = sshbuf_new()) == NULL ||
3152: (decrypted = sshbuf_new()) == NULL) {
3153: r = SSH_ERR_ALLOC_FAIL;
3154: goto out;
3155: }
3156:
3157: /* check preamble */
3158: cp = sshbuf_ptr(blob);
3159: encoded_len = sshbuf_len(blob);
3160: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3161: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3162: r = SSH_ERR_INVALID_FORMAT;
3163: goto out;
3164: }
3165: cp += MARK_BEGIN_LEN;
3166: encoded_len -= MARK_BEGIN_LEN;
3167:
3168: /* Look for end marker, removing whitespace as we go */
3169: while (encoded_len > 0) {
3170: if (*cp != '\n' && *cp != '\r') {
3171: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3172: goto out;
3173: }
3174: last = *cp;
3175: encoded_len--;
3176: cp++;
3177: if (last == '\n') {
3178: if (encoded_len >= MARK_END_LEN &&
3179: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3180: /* \0 terminate */
3181: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3182: goto out;
3183: break;
3184: }
3185: }
3186: }
3187: if (encoded_len == 0) {
3188: r = SSH_ERR_INVALID_FORMAT;
3189: goto out;
3190: }
3191:
3192: /* decode base64 */
1.4 djm 3193: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3194: goto out;
3195:
3196: /* check magic */
3197: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3198: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3199: r = SSH_ERR_INVALID_FORMAT;
3200: goto out;
3201: }
3202: /* parse public portion of key */
3203: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3204: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3205: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3206: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3207: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3208: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3209: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3210: goto out;
3211:
3212: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3213: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3214: goto out;
3215: }
3216: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3217: strcmp(ciphername, "none") != 0) {
3218: /* passphrase required */
3219: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3220: goto out;
3221: }
3222: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3223: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3224: goto out;
3225: }
3226: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3227: r = SSH_ERR_INVALID_FORMAT;
3228: goto out;
3229: }
3230: if (nkeys != 1) {
3231: /* XXX only one key supported */
3232: r = SSH_ERR_INVALID_FORMAT;
3233: goto out;
3234: }
3235:
3236: /* check size of encrypted key blob */
3237: blocksize = cipher_blocksize(cipher);
3238: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3239: r = SSH_ERR_INVALID_FORMAT;
3240: goto out;
3241: }
3242:
3243: /* setup key */
3244: keylen = cipher_keylen(cipher);
3245: ivlen = cipher_ivlen(cipher);
1.18 djm 3246: authlen = cipher_authlen(cipher);
1.1 djm 3247: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3248: r = SSH_ERR_ALLOC_FAIL;
3249: goto out;
3250: }
3251: if (strcmp(kdfname, "bcrypt") == 0) {
3252: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3253: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3254: goto out;
3255: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3256: key, keylen + ivlen, rounds) < 0) {
3257: r = SSH_ERR_INVALID_FORMAT;
3258: goto out;
3259: }
3260: }
3261:
1.18 djm 3262: /* check that an appropriate amount of auth data is present */
3263: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3264: r = SSH_ERR_INVALID_FORMAT;
3265: goto out;
3266: }
3267:
1.1 djm 3268: /* decrypt private portion of key */
3269: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3270: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3271: key + keylen, ivlen, 0)) != 0)
3272: goto out;
3273: if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3274: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3275: /* an integrity error here indicates an incorrect passphrase */
3276: if (r == SSH_ERR_MAC_INVALID)
3277: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3278: goto out;
3279: }
1.18 djm 3280: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3281: goto out;
3282: /* there should be no trailing data */
3283: if (sshbuf_len(decoded) != 0) {
3284: r = SSH_ERR_INVALID_FORMAT;
3285: goto out;
3286: }
3287:
3288: /* check check bytes */
3289: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3290: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3291: goto out;
3292: if (check1 != check2) {
3293: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3294: goto out;
3295: }
3296:
3297: /* Load the private key and comment */
3298: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3299: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3300: goto out;
3301:
3302: /* Check deterministic padding */
3303: i = 0;
3304: while (sshbuf_len(decrypted)) {
3305: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3306: goto out;
3307: if (pad != (++i & 0xff)) {
3308: r = SSH_ERR_INVALID_FORMAT;
3309: goto out;
3310: }
3311: }
3312:
3313: /* XXX decode pubkey and check against private */
3314:
3315: /* success */
3316: r = 0;
3317: if (keyp != NULL) {
3318: *keyp = k;
3319: k = NULL;
3320: }
3321: if (commentp != NULL) {
3322: *commentp = comment;
3323: comment = NULL;
3324: }
3325: out:
3326: pad = 0;
3327: cipher_cleanup(&ciphercontext);
3328: free(ciphername);
3329: free(kdfname);
3330: free(comment);
3331: if (salt != NULL) {
3332: explicit_bzero(salt, slen);
3333: free(salt);
3334: }
3335: if (key != NULL) {
3336: explicit_bzero(key, keylen + ivlen);
3337: free(key);
3338: }
3339: sshbuf_free(encoded);
3340: sshbuf_free(decoded);
3341: sshbuf_free(kdf);
3342: sshbuf_free(decrypted);
3343: sshkey_free(k);
3344: return r;
3345: }
3346:
3347: #if WITH_SSH1
3348: /*
3349: * Serialises the authentication (private) key to a blob, encrypting it with
3350: * passphrase. The identification of the blob (lowest 64 bits of n) will
3351: * precede the key to provide identification of the key without needing a
3352: * passphrase.
3353: */
3354: static int
3355: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3356: const char *passphrase, const char *comment)
3357: {
3358: struct sshbuf *buffer = NULL, *encrypted = NULL;
3359: u_char buf[8];
3360: int r, cipher_num;
3361: struct sshcipher_ctx ciphercontext;
3362: const struct sshcipher *cipher;
3363: u_char *cp;
3364:
3365: /*
3366: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3367: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3368: */
3369: cipher_num = (strcmp(passphrase, "") == 0) ?
3370: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3371: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3372: return SSH_ERR_INTERNAL_ERROR;
3373:
3374: /* This buffer is used to build the secret part of the private key. */
3375: if ((buffer = sshbuf_new()) == NULL)
3376: return SSH_ERR_ALLOC_FAIL;
3377:
3378: /* Put checkbytes for checking passphrase validity. */
3379: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3380: goto out;
3381: arc4random_buf(cp, 2);
3382: memcpy(cp + 2, cp, 2);
3383:
3384: /*
3385: * Store the private key (n and e will not be stored because they
3386: * will be stored in plain text, and storing them also in encrypted
3387: * format would just give known plaintext).
3388: * Note: q and p are stored in reverse order to SSL.
3389: */
3390: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3391: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3392: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3393: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3394: goto out;
3395:
3396: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3397: explicit_bzero(buf, 8);
3398: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3399: goto out;
3400:
3401: /* This buffer will be used to contain the data in the file. */
3402: if ((encrypted = sshbuf_new()) == NULL) {
3403: r = SSH_ERR_ALLOC_FAIL;
3404: goto out;
3405: }
3406:
3407: /* First store keyfile id string. */
3408: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3409: sizeof(LEGACY_BEGIN))) != 0)
3410: goto out;
3411:
3412: /* Store cipher type and "reserved" field. */
3413: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3414: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3415: goto out;
3416:
3417: /* Store public key. This will be in plain text. */
3418: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
1.22 jsg 3419: (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 ||
3420: (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 ||
3421: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
1.1 djm 3422: goto out;
3423:
3424: /* Allocate space for the private part of the key in the buffer. */
3425: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3426: goto out;
3427:
3428: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3429: CIPHER_ENCRYPT)) != 0)
3430: goto out;
3431: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3432: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3433: goto out;
3434: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3435: goto out;
3436:
3437: r = sshbuf_putb(blob, encrypted);
3438:
3439: out:
3440: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3441: explicit_bzero(buf, sizeof(buf));
3442: if (buffer != NULL)
3443: sshbuf_free(buffer);
3444: if (encrypted != NULL)
3445: sshbuf_free(encrypted);
3446:
3447: return r;
3448: }
3449: #endif /* WITH_SSH1 */
3450:
3451: #ifdef WITH_OPENSSL
3452: /* convert SSH v2 key in OpenSSL PEM format */
3453: static int
3454: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3455: const char *_passphrase, const char *comment)
3456: {
3457: int success, r;
3458: int blen, len = strlen(_passphrase);
3459: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3460: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3461: const u_char *bptr;
3462: BIO *bio = NULL;
3463:
3464: if (len > 0 && len <= 4)
3465: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3466: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3467: return SSH_ERR_ALLOC_FAIL;
3468:
3469: switch (key->type) {
3470: case KEY_DSA:
3471: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3472: cipher, passphrase, len, NULL, NULL);
3473: break;
3474: case KEY_ECDSA:
3475: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3476: cipher, passphrase, len, NULL, NULL);
3477: break;
3478: case KEY_RSA:
3479: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3480: cipher, passphrase, len, NULL, NULL);
3481: break;
3482: default:
3483: success = 0;
3484: break;
3485: }
3486: if (success == 0) {
3487: r = SSH_ERR_LIBCRYPTO_ERROR;
3488: goto out;
3489: }
3490: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3491: r = SSH_ERR_INTERNAL_ERROR;
3492: goto out;
3493: }
3494: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3495: goto out;
3496: r = 0;
3497: out:
3498: BIO_free(bio);
3499: return r;
3500: }
3501: #endif /* WITH_OPENSSL */
3502:
3503: /* Serialise "key" to buffer "blob" */
3504: int
3505: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3506: const char *passphrase, const char *comment,
3507: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3508: {
3509: switch (key->type) {
1.9 markus 3510: #ifdef WITH_SSH1
1.1 djm 3511: case KEY_RSA1:
3512: return sshkey_private_rsa1_to_blob(key, blob,
3513: passphrase, comment);
1.9 markus 3514: #endif /* WITH_SSH1 */
3515: #ifdef WITH_OPENSSL
1.1 djm 3516: case KEY_DSA:
3517: case KEY_ECDSA:
3518: case KEY_RSA:
3519: if (force_new_format) {
3520: return sshkey_private_to_blob2(key, blob, passphrase,
3521: comment, new_format_cipher, new_format_rounds);
3522: }
3523: return sshkey_private_pem_to_blob(key, blob,
3524: passphrase, comment);
3525: #endif /* WITH_OPENSSL */
3526: case KEY_ED25519:
3527: return sshkey_private_to_blob2(key, blob, passphrase,
3528: comment, new_format_cipher, new_format_rounds);
3529: default:
3530: return SSH_ERR_KEY_TYPE_UNKNOWN;
3531: }
3532: }
3533:
3534: #ifdef WITH_SSH1
3535: /*
3536: * Parse the public, unencrypted portion of a RSA1 key.
3537: */
3538: int
3539: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3540: struct sshkey **keyp, char **commentp)
3541: {
3542: int r;
3543: struct sshkey *pub = NULL;
3544: struct sshbuf *copy = NULL;
3545:
3546: if (keyp != NULL)
3547: *keyp = NULL;
3548: if (commentp != NULL)
3549: *commentp = NULL;
3550:
3551: /* Check that it is at least big enough to contain the ID string. */
3552: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3553: return SSH_ERR_INVALID_FORMAT;
3554:
3555: /*
3556: * Make sure it begins with the id string. Consume the id string
3557: * from the buffer.
3558: */
3559: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3560: return SSH_ERR_INVALID_FORMAT;
3561: /* Make a working copy of the keyblob and skip past the magic */
3562: if ((copy = sshbuf_fromb(blob)) == NULL)
3563: return SSH_ERR_ALLOC_FAIL;
3564: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3565: goto out;
3566:
3567: /* Skip cipher type, reserved data and key bits. */
3568: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3569: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3570: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3571: goto out;
3572:
3573: /* Read the public key from the buffer. */
3574: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3575: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3576: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3577: goto out;
3578:
3579: /* Finally, the comment */
3580: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3581: goto out;
3582:
3583: /* The encrypted private part is not parsed by this function. */
3584:
3585: r = 0;
3586: if (keyp != NULL)
3587: *keyp = pub;
3588: else
3589: sshkey_free(pub);
3590: pub = NULL;
3591:
3592: out:
3593: if (copy != NULL)
3594: sshbuf_free(copy);
3595: if (pub != NULL)
3596: sshkey_free(pub);
3597: return r;
3598: }
3599:
3600: static int
3601: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3602: struct sshkey **keyp, char **commentp)
3603: {
3604: int r;
3605: u_int16_t check1, check2;
3606: u_int8_t cipher_type;
3607: struct sshbuf *decrypted = NULL, *copy = NULL;
3608: u_char *cp;
3609: char *comment = NULL;
3610: struct sshcipher_ctx ciphercontext;
3611: const struct sshcipher *cipher;
3612: struct sshkey *prv = NULL;
3613:
3614: *keyp = NULL;
3615: if (commentp != NULL)
3616: *commentp = NULL;
3617:
3618: /* Check that it is at least big enough to contain the ID string. */
3619: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3620: return SSH_ERR_INVALID_FORMAT;
3621:
3622: /*
3623: * Make sure it begins with the id string. Consume the id string
3624: * from the buffer.
3625: */
3626: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3627: return SSH_ERR_INVALID_FORMAT;
3628:
3629: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3630: r = SSH_ERR_ALLOC_FAIL;
3631: goto out;
3632: }
3633: if ((copy = sshbuf_fromb(blob)) == NULL ||
3634: (decrypted = sshbuf_new()) == NULL) {
3635: r = SSH_ERR_ALLOC_FAIL;
3636: goto out;
3637: }
3638: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3639: goto out;
3640:
3641: /* Read cipher type. */
3642: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3643: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3644: goto out;
3645:
3646: /* Read the public key and comment from the buffer. */
3647: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3648: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3649: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3650: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3651: goto out;
3652:
3653: /* Check that it is a supported cipher. */
3654: cipher = cipher_by_number(cipher_type);
3655: if (cipher == NULL) {
3656: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3657: goto out;
3658: }
3659: /* Initialize space for decrypted data. */
3660: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3661: goto out;
3662:
3663: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3664: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3665: CIPHER_DECRYPT)) != 0)
3666: goto out;
3667: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3668: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3669: cipher_cleanup(&ciphercontext);
3670: goto out;
3671: }
3672: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3673: goto out;
3674:
3675: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3676: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3677: goto out;
3678: if (check1 != check2) {
3679: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3680: goto out;
3681: }
3682:
3683: /* Read the rest of the private key. */
3684: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3685: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3686: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3687: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3688: goto out;
3689:
3690: /* calculate p-1 and q-1 */
3691: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3692: goto out;
3693:
3694: /* enable blinding */
3695: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3696: r = SSH_ERR_LIBCRYPTO_ERROR;
3697: goto out;
3698: }
3699: r = 0;
3700: *keyp = prv;
3701: prv = NULL;
3702: if (commentp != NULL) {
3703: *commentp = comment;
3704: comment = NULL;
3705: }
3706: out:
3707: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3708: if (comment != NULL)
3709: free(comment);
3710: if (prv != NULL)
3711: sshkey_free(prv);
3712: if (copy != NULL)
3713: sshbuf_free(copy);
3714: if (decrypted != NULL)
3715: sshbuf_free(decrypted);
3716: return r;
3717: }
3718: #endif /* WITH_SSH1 */
3719:
3720: #ifdef WITH_OPENSSL
1.8 djm 3721: static int
1.1 djm 3722: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3723: const char *passphrase, struct sshkey **keyp)
1.1 djm 3724: {
3725: EVP_PKEY *pk = NULL;
3726: struct sshkey *prv = NULL;
3727: BIO *bio = NULL;
3728: int r;
3729:
3730: *keyp = NULL;
3731:
3732: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3733: return SSH_ERR_ALLOC_FAIL;
3734: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3735: (int)sshbuf_len(blob)) {
3736: r = SSH_ERR_ALLOC_FAIL;
3737: goto out;
3738: }
3739:
3740: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3741: (char *)passphrase)) == NULL) {
3742: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3743: goto out;
3744: }
3745: if (pk->type == EVP_PKEY_RSA &&
3746: (type == KEY_UNSPEC || type == KEY_RSA)) {
3747: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3748: r = SSH_ERR_ALLOC_FAIL;
3749: goto out;
3750: }
3751: prv->rsa = EVP_PKEY_get1_RSA(pk);
3752: prv->type = KEY_RSA;
3753: #ifdef DEBUG_PK
3754: RSA_print_fp(stderr, prv->rsa, 8);
3755: #endif
3756: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3757: r = SSH_ERR_LIBCRYPTO_ERROR;
3758: goto out;
3759: }
3760: } else if (pk->type == EVP_PKEY_DSA &&
3761: (type == KEY_UNSPEC || type == KEY_DSA)) {
3762: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3763: r = SSH_ERR_ALLOC_FAIL;
3764: goto out;
3765: }
3766: prv->dsa = EVP_PKEY_get1_DSA(pk);
3767: prv->type = KEY_DSA;
3768: #ifdef DEBUG_PK
3769: DSA_print_fp(stderr, prv->dsa, 8);
3770: #endif
3771: } else if (pk->type == EVP_PKEY_EC &&
3772: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3773: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3774: r = SSH_ERR_ALLOC_FAIL;
3775: goto out;
3776: }
3777: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3778: prv->type = KEY_ECDSA;
3779: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3780: if (prv->ecdsa_nid == -1 ||
3781: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3782: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3783: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3784: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3785: r = SSH_ERR_INVALID_FORMAT;
3786: goto out;
3787: }
3788: #ifdef DEBUG_PK
3789: if (prv != NULL && prv->ecdsa != NULL)
3790: sshkey_dump_ec_key(prv->ecdsa);
3791: #endif
3792: } else {
3793: r = SSH_ERR_INVALID_FORMAT;
3794: goto out;
3795: }
3796: r = 0;
3797: *keyp = prv;
3798: prv = NULL;
3799: out:
3800: BIO_free(bio);
3801: if (pk != NULL)
3802: EVP_PKEY_free(pk);
3803: if (prv != NULL)
3804: sshkey_free(prv);
3805: return r;
3806: }
3807: #endif /* WITH_OPENSSL */
3808:
3809: int
3810: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3811: const char *passphrase, struct sshkey **keyp, char **commentp)
3812: {
3813: *keyp = NULL;
3814: if (commentp != NULL)
3815: *commentp = NULL;
3816:
3817: switch (type) {
1.9 markus 3818: #ifdef WITH_SSH1
1.1 djm 3819: case KEY_RSA1:
3820: return sshkey_parse_private_rsa1(blob, passphrase,
3821: keyp, commentp);
1.9 markus 3822: #endif /* WITH_SSH1 */
3823: #ifdef WITH_OPENSSL
1.1 djm 3824: case KEY_DSA:
3825: case KEY_ECDSA:
3826: case KEY_RSA:
1.8 djm 3827: return sshkey_parse_private_pem_fileblob(blob, type,
3828: passphrase, keyp);
1.1 djm 3829: #endif /* WITH_OPENSSL */
3830: case KEY_ED25519:
3831: return sshkey_parse_private2(blob, type, passphrase,
3832: keyp, commentp);
3833: case KEY_UNSPEC:
1.23 tim 3834: if (sshkey_parse_private2(blob, type, passphrase, keyp,
3835: commentp) == 0)
1.1 djm 3836: return 0;
3837: #ifdef WITH_OPENSSL
1.8 djm 3838: return sshkey_parse_private_pem_fileblob(blob, type,
3839: passphrase, keyp);
1.1 djm 3840: #else
3841: return SSH_ERR_INVALID_FORMAT;
3842: #endif /* WITH_OPENSSL */
3843: default:
3844: return SSH_ERR_KEY_TYPE_UNKNOWN;
3845: }
3846: }
3847:
3848: int
3849: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3850: struct sshkey **keyp, char **commentp)
1.1 djm 3851: {
3852: if (keyp != NULL)
3853: *keyp = NULL;
3854: if (commentp != NULL)
3855: *commentp = NULL;
3856:
3857: #ifdef WITH_SSH1
3858: /* it's a SSH v1 key if the public key part is readable */
1.23 tim 3859: if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) {
1.1 djm 3860: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3861: passphrase, keyp, commentp);
3862: }
3863: #endif /* WITH_SSH1 */
1.23 tim 3864: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3865: passphrase, keyp, commentp);
1.1 djm 3866: }
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