Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.41
1.41 ! dtucker 1: /* $OpenBSD: sshkey.c,v 1.40 2016/10/04 21:34:40 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4: * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5: * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/types.h>
1.7 djm 29: #include <netinet/in.h>
1.1 djm 30:
1.12 djm 31: #ifdef WITH_OPENSSL
1.1 djm 32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
1.12 djm 35: #endif
1.1 djm 36:
37: #include "crypto_api.h"
38:
39: #include <errno.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <util.h>
1.13 deraadt 43: #include <limits.h>
1.7 djm 44: #include <resolv.h>
1.1 djm 45:
46: #include "ssh2.h"
47: #include "ssherr.h"
48: #include "misc.h"
49: #include "sshbuf.h"
50: #include "rsa.h"
51: #include "cipher.h"
52: #include "digest.h"
53: #define SSHKEY_INTERNAL
54: #include "sshkey.h"
1.11 djm 55: #include "match.h"
1.1 djm 56:
57: /* openssh private key file format */
58: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
59: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
60: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
61: #define MARK_END_LEN (sizeof(MARK_END) - 1)
62: #define KDFNAME "bcrypt"
63: #define AUTH_MAGIC "openssh-key-v1"
64: #define SALT_LEN 16
65: #define DEFAULT_CIPHERNAME "aes256-cbc"
66: #define DEFAULT_ROUNDS 16
67:
68: /* Version identification string for SSH v1 identity files. */
69: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
70:
1.14 djm 71: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 72: struct sshkey **keyp, int allow_cert);
73:
74: /* Supported key types */
75: struct keytype {
76: const char *name;
77: const char *shortname;
78: int type;
79: int nid;
80: int cert;
1.28 markus 81: int sigonly;
1.1 djm 82: };
83: static const struct keytype keytypes[] = {
1.28 markus 84: { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0, 0 },
1.1 djm 85: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
1.28 markus 86: KEY_ED25519_CERT, 0, 1, 0 },
1.1 djm 87: #ifdef WITH_OPENSSL
1.28 markus 88: { NULL, "RSA1", KEY_RSA1, 0, 0, 0 },
89: { "ssh-rsa", "RSA", KEY_RSA, 0, 0, 0 },
90: { "rsa-sha2-256", "RSA", KEY_RSA, 0, 0, 1 },
91: { "rsa-sha2-512", "RSA", KEY_RSA, 0, 0, 1 },
92: { "ssh-dss", "DSA", KEY_DSA, 0, 0, 0 },
93: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
94: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0, 0 },
95: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0, 0 },
96: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1, 0 },
97: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1, 0 },
1.1 djm 98: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 99: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.1 djm 100: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 101: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.1 djm 102: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 103: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.1 djm 104: #endif /* WITH_OPENSSL */
1.28 markus 105: { NULL, NULL, -1, -1, 0, 0 }
1.1 djm 106: };
107:
108: const char *
109: sshkey_type(const struct sshkey *k)
110: {
111: const struct keytype *kt;
112:
113: for (kt = keytypes; kt->type != -1; kt++) {
114: if (kt->type == k->type)
115: return kt->shortname;
116: }
117: return "unknown";
118: }
119:
120: static const char *
121: sshkey_ssh_name_from_type_nid(int type, int nid)
122: {
123: const struct keytype *kt;
124:
125: for (kt = keytypes; kt->type != -1; kt++) {
126: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
127: return kt->name;
128: }
129: return "ssh-unknown";
130: }
131:
132: int
133: sshkey_type_is_cert(int type)
134: {
135: const struct keytype *kt;
136:
137: for (kt = keytypes; kt->type != -1; kt++) {
138: if (kt->type == type)
139: return kt->cert;
140: }
141: return 0;
142: }
143:
144: const char *
145: sshkey_ssh_name(const struct sshkey *k)
146: {
147: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
148: }
149:
150: const char *
151: sshkey_ssh_name_plain(const struct sshkey *k)
152: {
153: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
154: k->ecdsa_nid);
155: }
156:
157: int
158: sshkey_type_from_name(const char *name)
159: {
160: const struct keytype *kt;
161:
162: for (kt = keytypes; kt->type != -1; kt++) {
163: /* Only allow shortname matches for plain key types */
164: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
165: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
166: return kt->type;
167: }
168: return KEY_UNSPEC;
169: }
170:
171: int
172: sshkey_ecdsa_nid_from_name(const char *name)
173: {
174: const struct keytype *kt;
175:
1.4 djm 176: for (kt = keytypes; kt->type != -1; kt++) {
177: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
178: continue;
179: if (kt->name != NULL && strcmp(name, kt->name) == 0)
180: return kt->nid;
181: }
1.1 djm 182: return -1;
183: }
184:
185: char *
1.38 djm 186: sshkey_alg_list(int certs_only, int plain_only, char sep)
1.1 djm 187: {
188: char *tmp, *ret = NULL;
189: size_t nlen, rlen = 0;
190: const struct keytype *kt;
191:
192: for (kt = keytypes; kt->type != -1; kt++) {
1.28 markus 193: if (kt->name == NULL || kt->sigonly)
1.1 djm 194: continue;
195: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
196: continue;
197: if (ret != NULL)
1.38 djm 198: ret[rlen++] = sep;
1.1 djm 199: nlen = strlen(kt->name);
200: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
201: free(ret);
202: return NULL;
203: }
204: ret = tmp;
205: memcpy(ret + rlen, kt->name, nlen + 1);
206: rlen += nlen;
207: }
208: return ret;
209: }
210:
211: int
1.11 djm 212: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 213: {
214: char *s, *cp, *p;
1.11 djm 215: const struct keytype *kt;
216: int type;
1.1 djm 217:
218: if (names == NULL || strcmp(names, "") == 0)
219: return 0;
220: if ((s = cp = strdup(names)) == NULL)
221: return 0;
222: for ((p = strsep(&cp, ",")); p && *p != '\0';
223: (p = strsep(&cp, ","))) {
1.11 djm 224: type = sshkey_type_from_name(p);
225: if (type == KEY_RSA1) {
226: free(s);
227: return 0;
228: }
229: if (type == KEY_UNSPEC) {
230: if (allow_wildcard) {
231: /*
232: * Try matching key types against the string.
233: * If any has a positive or negative match then
234: * the component is accepted.
235: */
236: for (kt = keytypes; kt->type != -1; kt++) {
237: if (kt->type == KEY_RSA1)
238: continue;
239: if (match_pattern_list(kt->name,
1.17 djm 240: p, 0) != 0)
1.11 djm 241: break;
242: }
243: if (kt->type != -1)
244: continue;
245: }
1.1 djm 246: free(s);
247: return 0;
248: }
249: }
250: free(s);
251: return 1;
252: }
253:
254: u_int
255: sshkey_size(const struct sshkey *k)
256: {
257: switch (k->type) {
258: #ifdef WITH_OPENSSL
259: case KEY_RSA1:
260: case KEY_RSA:
261: case KEY_RSA_CERT:
262: return BN_num_bits(k->rsa->n);
263: case KEY_DSA:
264: case KEY_DSA_CERT:
265: return BN_num_bits(k->dsa->p);
266: case KEY_ECDSA:
267: case KEY_ECDSA_CERT:
268: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
269: #endif /* WITH_OPENSSL */
270: case KEY_ED25519:
271: case KEY_ED25519_CERT:
272: return 256; /* XXX */
273: }
274: return 0;
275: }
276:
277: static int
278: sshkey_type_is_valid_ca(int type)
279: {
280: switch (type) {
281: case KEY_RSA:
282: case KEY_DSA:
283: case KEY_ECDSA:
284: case KEY_ED25519:
285: return 1;
286: default:
287: return 0;
288: }
289: }
290:
291: int
292: sshkey_is_cert(const struct sshkey *k)
293: {
294: if (k == NULL)
295: return 0;
296: return sshkey_type_is_cert(k->type);
297: }
298:
299: /* Return the cert-less equivalent to a certified key type */
300: int
301: sshkey_type_plain(int type)
302: {
303: switch (type) {
304: case KEY_RSA_CERT:
305: return KEY_RSA;
306: case KEY_DSA_CERT:
307: return KEY_DSA;
308: case KEY_ECDSA_CERT:
309: return KEY_ECDSA;
310: case KEY_ED25519_CERT:
311: return KEY_ED25519;
312: default:
313: return type;
314: }
315: }
316:
317: #ifdef WITH_OPENSSL
318: /* XXX: these are really begging for a table-driven approach */
319: int
320: sshkey_curve_name_to_nid(const char *name)
321: {
322: if (strcmp(name, "nistp256") == 0)
323: return NID_X9_62_prime256v1;
324: else if (strcmp(name, "nistp384") == 0)
325: return NID_secp384r1;
326: else if (strcmp(name, "nistp521") == 0)
327: return NID_secp521r1;
328: else
329: return -1;
330: }
331:
332: u_int
333: sshkey_curve_nid_to_bits(int nid)
334: {
335: switch (nid) {
336: case NID_X9_62_prime256v1:
337: return 256;
338: case NID_secp384r1:
339: return 384;
340: case NID_secp521r1:
341: return 521;
342: default:
343: return 0;
344: }
345: }
346:
347: int
348: sshkey_ecdsa_bits_to_nid(int bits)
349: {
350: switch (bits) {
351: case 256:
352: return NID_X9_62_prime256v1;
353: case 384:
354: return NID_secp384r1;
355: case 521:
356: return NID_secp521r1;
357: default:
358: return -1;
359: }
360: }
361:
362: const char *
363: sshkey_curve_nid_to_name(int nid)
364: {
365: switch (nid) {
366: case NID_X9_62_prime256v1:
367: return "nistp256";
368: case NID_secp384r1:
369: return "nistp384";
370: case NID_secp521r1:
371: return "nistp521";
372: default:
373: return NULL;
374: }
375: }
376:
377: int
378: sshkey_ec_nid_to_hash_alg(int nid)
379: {
380: int kbits = sshkey_curve_nid_to_bits(nid);
381:
382: if (kbits <= 0)
383: return -1;
384:
385: /* RFC5656 section 6.2.1 */
386: if (kbits <= 256)
387: return SSH_DIGEST_SHA256;
388: else if (kbits <= 384)
389: return SSH_DIGEST_SHA384;
390: else
391: return SSH_DIGEST_SHA512;
392: }
393: #endif /* WITH_OPENSSL */
394:
395: static void
396: cert_free(struct sshkey_cert *cert)
397: {
398: u_int i;
399:
400: if (cert == NULL)
401: return;
1.31 mmcc 402: sshbuf_free(cert->certblob);
403: sshbuf_free(cert->critical);
404: sshbuf_free(cert->extensions);
1.29 mmcc 405: free(cert->key_id);
1.1 djm 406: for (i = 0; i < cert->nprincipals; i++)
407: free(cert->principals[i]);
1.29 mmcc 408: free(cert->principals);
1.30 mmcc 409: sshkey_free(cert->signature_key);
1.1 djm 410: explicit_bzero(cert, sizeof(*cert));
411: free(cert);
412: }
413:
414: static struct sshkey_cert *
415: cert_new(void)
416: {
417: struct sshkey_cert *cert;
418:
419: if ((cert = calloc(1, sizeof(*cert))) == NULL)
420: return NULL;
421: if ((cert->certblob = sshbuf_new()) == NULL ||
422: (cert->critical = sshbuf_new()) == NULL ||
423: (cert->extensions = sshbuf_new()) == NULL) {
424: cert_free(cert);
425: return NULL;
426: }
427: cert->key_id = NULL;
428: cert->principals = NULL;
429: cert->signature_key = NULL;
430: return cert;
431: }
432:
433: struct sshkey *
434: sshkey_new(int type)
435: {
436: struct sshkey *k;
437: #ifdef WITH_OPENSSL
438: RSA *rsa;
439: DSA *dsa;
440: #endif /* WITH_OPENSSL */
441:
442: if ((k = calloc(1, sizeof(*k))) == NULL)
443: return NULL;
444: k->type = type;
445: k->ecdsa = NULL;
446: k->ecdsa_nid = -1;
447: k->dsa = NULL;
448: k->rsa = NULL;
449: k->cert = NULL;
450: k->ed25519_sk = NULL;
451: k->ed25519_pk = NULL;
452: switch (k->type) {
453: #ifdef WITH_OPENSSL
454: case KEY_RSA1:
455: case KEY_RSA:
456: case KEY_RSA_CERT:
457: if ((rsa = RSA_new()) == NULL ||
458: (rsa->n = BN_new()) == NULL ||
459: (rsa->e = BN_new()) == NULL) {
460: if (rsa != NULL)
461: RSA_free(rsa);
462: free(k);
463: return NULL;
464: }
465: k->rsa = rsa;
466: break;
467: case KEY_DSA:
468: case KEY_DSA_CERT:
469: if ((dsa = DSA_new()) == NULL ||
470: (dsa->p = BN_new()) == NULL ||
471: (dsa->q = BN_new()) == NULL ||
472: (dsa->g = BN_new()) == NULL ||
473: (dsa->pub_key = BN_new()) == NULL) {
474: if (dsa != NULL)
475: DSA_free(dsa);
476: free(k);
477: return NULL;
478: }
479: k->dsa = dsa;
480: break;
481: case KEY_ECDSA:
482: case KEY_ECDSA_CERT:
483: /* Cannot do anything until we know the group */
484: break;
485: #endif /* WITH_OPENSSL */
486: case KEY_ED25519:
487: case KEY_ED25519_CERT:
488: /* no need to prealloc */
489: break;
490: case KEY_UNSPEC:
491: break;
492: default:
493: free(k);
494: return NULL;
495: }
496:
497: if (sshkey_is_cert(k)) {
498: if ((k->cert = cert_new()) == NULL) {
499: sshkey_free(k);
500: return NULL;
501: }
502: }
503:
504: return k;
505: }
506:
507: int
508: sshkey_add_private(struct sshkey *k)
509: {
510: switch (k->type) {
511: #ifdef WITH_OPENSSL
512: case KEY_RSA1:
513: case KEY_RSA:
514: case KEY_RSA_CERT:
515: #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
516: if (bn_maybe_alloc_failed(k->rsa->d) ||
517: bn_maybe_alloc_failed(k->rsa->iqmp) ||
518: bn_maybe_alloc_failed(k->rsa->q) ||
519: bn_maybe_alloc_failed(k->rsa->p) ||
520: bn_maybe_alloc_failed(k->rsa->dmq1) ||
521: bn_maybe_alloc_failed(k->rsa->dmp1))
522: return SSH_ERR_ALLOC_FAIL;
523: break;
524: case KEY_DSA:
525: case KEY_DSA_CERT:
526: if (bn_maybe_alloc_failed(k->dsa->priv_key))
527: return SSH_ERR_ALLOC_FAIL;
528: break;
529: #undef bn_maybe_alloc_failed
530: case KEY_ECDSA:
531: case KEY_ECDSA_CERT:
532: /* Cannot do anything until we know the group */
533: break;
534: #endif /* WITH_OPENSSL */
535: case KEY_ED25519:
536: case KEY_ED25519_CERT:
537: /* no need to prealloc */
538: break;
539: case KEY_UNSPEC:
540: break;
541: default:
542: return SSH_ERR_INVALID_ARGUMENT;
543: }
544: return 0;
545: }
546:
547: struct sshkey *
548: sshkey_new_private(int type)
549: {
550: struct sshkey *k = sshkey_new(type);
551:
552: if (k == NULL)
553: return NULL;
554: if (sshkey_add_private(k) != 0) {
555: sshkey_free(k);
556: return NULL;
557: }
558: return k;
559: }
560:
561: void
562: sshkey_free(struct sshkey *k)
563: {
564: if (k == NULL)
565: return;
566: switch (k->type) {
567: #ifdef WITH_OPENSSL
568: case KEY_RSA1:
569: case KEY_RSA:
570: case KEY_RSA_CERT:
571: if (k->rsa != NULL)
572: RSA_free(k->rsa);
573: k->rsa = NULL;
574: break;
575: case KEY_DSA:
576: case KEY_DSA_CERT:
577: if (k->dsa != NULL)
578: DSA_free(k->dsa);
579: k->dsa = NULL;
580: break;
581: case KEY_ECDSA:
582: case KEY_ECDSA_CERT:
583: if (k->ecdsa != NULL)
584: EC_KEY_free(k->ecdsa);
585: k->ecdsa = NULL;
586: break;
587: #endif /* WITH_OPENSSL */
588: case KEY_ED25519:
589: case KEY_ED25519_CERT:
590: if (k->ed25519_pk) {
591: explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
592: free(k->ed25519_pk);
593: k->ed25519_pk = NULL;
594: }
595: if (k->ed25519_sk) {
596: explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
597: free(k->ed25519_sk);
598: k->ed25519_sk = NULL;
599: }
600: break;
601: case KEY_UNSPEC:
602: break;
603: default:
604: break;
605: }
606: if (sshkey_is_cert(k))
607: cert_free(k->cert);
608: explicit_bzero(k, sizeof(*k));
609: free(k);
610: }
611:
612: static int
613: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
614: {
615: if (a == NULL && b == NULL)
616: return 1;
617: if (a == NULL || b == NULL)
618: return 0;
619: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
620: return 0;
621: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
622: sshbuf_len(a->certblob)) != 0)
623: return 0;
624: return 1;
625: }
626:
627: /*
628: * Compare public portions of key only, allowing comparisons between
629: * certificates and plain keys too.
630: */
631: int
632: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
633: {
634: #ifdef WITH_OPENSSL
635: BN_CTX *bnctx;
636: #endif /* WITH_OPENSSL */
637:
638: if (a == NULL || b == NULL ||
639: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
640: return 0;
641:
642: switch (a->type) {
643: #ifdef WITH_OPENSSL
644: case KEY_RSA1:
645: case KEY_RSA_CERT:
646: case KEY_RSA:
647: return a->rsa != NULL && b->rsa != NULL &&
648: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
649: BN_cmp(a->rsa->n, b->rsa->n) == 0;
650: case KEY_DSA_CERT:
651: case KEY_DSA:
652: return a->dsa != NULL && b->dsa != NULL &&
653: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
654: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
655: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
656: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
657: case KEY_ECDSA_CERT:
658: case KEY_ECDSA:
659: if (a->ecdsa == NULL || b->ecdsa == NULL ||
660: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
661: EC_KEY_get0_public_key(b->ecdsa) == NULL)
662: return 0;
663: if ((bnctx = BN_CTX_new()) == NULL)
664: return 0;
665: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
666: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
667: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
668: EC_KEY_get0_public_key(a->ecdsa),
669: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
670: BN_CTX_free(bnctx);
671: return 0;
672: }
673: BN_CTX_free(bnctx);
674: return 1;
675: #endif /* WITH_OPENSSL */
676: case KEY_ED25519:
677: case KEY_ED25519_CERT:
678: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
679: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
680: default:
681: return 0;
682: }
683: /* NOTREACHED */
684: }
685:
686: int
687: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
688: {
689: if (a == NULL || b == NULL || a->type != b->type)
690: return 0;
691: if (sshkey_is_cert(a)) {
692: if (!cert_compare(a->cert, b->cert))
693: return 0;
694: }
695: return sshkey_equal_public(a, b);
696: }
697:
698: static int
699: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
700: {
701: int type, ret = SSH_ERR_INTERNAL_ERROR;
702: const char *typename;
703:
704: if (key == NULL)
705: return SSH_ERR_INVALID_ARGUMENT;
706:
1.19 djm 707: if (sshkey_is_cert(key)) {
708: if (key->cert == NULL)
709: return SSH_ERR_EXPECTED_CERT;
710: if (sshbuf_len(key->cert->certblob) == 0)
711: return SSH_ERR_KEY_LACKS_CERTBLOB;
712: }
1.1 djm 713: type = force_plain ? sshkey_type_plain(key->type) : key->type;
714: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
715:
716: switch (type) {
717: #ifdef WITH_OPENSSL
718: case KEY_DSA_CERT:
719: case KEY_ECDSA_CERT:
720: case KEY_RSA_CERT:
721: #endif /* WITH_OPENSSL */
722: case KEY_ED25519_CERT:
723: /* Use the existing blob */
724: /* XXX modified flag? */
725: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
726: return ret;
727: break;
728: #ifdef WITH_OPENSSL
729: case KEY_DSA:
730: if (key->dsa == NULL)
731: return SSH_ERR_INVALID_ARGUMENT;
732: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
733: (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
734: (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
735: (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
736: (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
737: return ret;
738: break;
739: case KEY_ECDSA:
740: if (key->ecdsa == NULL)
741: return SSH_ERR_INVALID_ARGUMENT;
742: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
743: (ret = sshbuf_put_cstring(b,
744: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
745: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
746: return ret;
747: break;
748: case KEY_RSA:
749: if (key->rsa == NULL)
750: return SSH_ERR_INVALID_ARGUMENT;
751: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
752: (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
753: (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
754: return ret;
755: break;
756: #endif /* WITH_OPENSSL */
757: case KEY_ED25519:
758: if (key->ed25519_pk == NULL)
759: return SSH_ERR_INVALID_ARGUMENT;
760: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
761: (ret = sshbuf_put_string(b,
762: key->ed25519_pk, ED25519_PK_SZ)) != 0)
763: return ret;
764: break;
765: default:
766: return SSH_ERR_KEY_TYPE_UNKNOWN;
767: }
768: return 0;
769: }
770:
771: int
1.14 djm 772: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 773: {
774: return to_blob_buf(key, b, 0);
775: }
776:
777: int
1.14 djm 778: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
779: {
780: struct sshbuf *tmp;
781: int r;
782:
783: if ((tmp = sshbuf_new()) == NULL)
784: return SSH_ERR_ALLOC_FAIL;
785: r = to_blob_buf(key, tmp, 0);
786: if (r == 0)
787: r = sshbuf_put_stringb(b, tmp);
788: sshbuf_free(tmp);
789: return r;
790: }
791:
792: int
793: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 794: {
795: return to_blob_buf(key, b, 1);
796: }
797:
798: static int
799: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
800: {
801: int ret = SSH_ERR_INTERNAL_ERROR;
802: size_t len;
803: struct sshbuf *b = NULL;
804:
805: if (lenp != NULL)
806: *lenp = 0;
807: if (blobp != NULL)
808: *blobp = NULL;
809: if ((b = sshbuf_new()) == NULL)
810: return SSH_ERR_ALLOC_FAIL;
811: if ((ret = to_blob_buf(key, b, force_plain)) != 0)
812: goto out;
813: len = sshbuf_len(b);
814: if (lenp != NULL)
815: *lenp = len;
816: if (blobp != NULL) {
817: if ((*blobp = malloc(len)) == NULL) {
818: ret = SSH_ERR_ALLOC_FAIL;
819: goto out;
820: }
821: memcpy(*blobp, sshbuf_ptr(b), len);
822: }
823: ret = 0;
824: out:
825: sshbuf_free(b);
826: return ret;
827: }
828:
829: int
830: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
831: {
832: return to_blob(key, blobp, lenp, 0);
833: }
834:
835: int
836: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
837: {
838: return to_blob(key, blobp, lenp, 1);
839: }
840:
841: int
1.7 djm 842: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 843: u_char **retp, size_t *lenp)
844: {
845: u_char *blob = NULL, *ret = NULL;
846: size_t blob_len = 0;
1.7 djm 847: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 848:
849: if (retp != NULL)
850: *retp = NULL;
851: if (lenp != NULL)
852: *lenp = 0;
1.7 djm 853: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 854: r = SSH_ERR_INVALID_ARGUMENT;
855: goto out;
856: }
857:
858: if (k->type == KEY_RSA1) {
859: #ifdef WITH_OPENSSL
860: int nlen = BN_num_bytes(k->rsa->n);
861: int elen = BN_num_bytes(k->rsa->e);
862:
1.39 djm 863: if (nlen < 0 || elen < 0 || nlen >= INT_MAX - elen) {
864: r = SSH_ERR_INVALID_FORMAT;
865: goto out;
866: }
1.1 djm 867: blob_len = nlen + elen;
1.39 djm 868: if ((blob = malloc(blob_len)) == NULL) {
1.1 djm 869: r = SSH_ERR_ALLOC_FAIL;
870: goto out;
871: }
872: BN_bn2bin(k->rsa->n, blob);
873: BN_bn2bin(k->rsa->e, blob + nlen);
874: #endif /* WITH_OPENSSL */
875: } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
876: goto out;
877: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
878: r = SSH_ERR_ALLOC_FAIL;
879: goto out;
880: }
1.7 djm 881: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 882: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
883: goto out;
884: /* success */
885: if (retp != NULL) {
886: *retp = ret;
887: ret = NULL;
888: }
889: if (lenp != NULL)
1.7 djm 890: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 891: r = 0;
892: out:
893: free(ret);
894: if (blob != NULL) {
895: explicit_bzero(blob, blob_len);
896: free(blob);
897: }
898: return r;
899: }
900:
901: static char *
1.7 djm 902: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
903: {
904: char *ret;
905: size_t plen = strlen(alg) + 1;
906: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
907: int r;
908:
909: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
910: return NULL;
911: strlcpy(ret, alg, rlen);
912: strlcat(ret, ":", rlen);
913: if (dgst_raw_len == 0)
914: return ret;
915: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
916: ret + plen, rlen - plen)) == -1) {
917: explicit_bzero(ret, rlen);
918: free(ret);
919: return NULL;
920: }
921: /* Trim padding characters from end */
922: ret[strcspn(ret, "=")] = '\0';
923: return ret;
924: }
925:
926: static char *
927: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 928: {
1.7 djm 929: char *retval, hex[5];
930: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 931:
1.7 djm 932: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 933: return NULL;
1.7 djm 934: strlcpy(retval, alg, rlen);
935: strlcat(retval, ":", rlen);
1.1 djm 936: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 937: snprintf(hex, sizeof(hex), "%s%02x",
938: i > 0 ? ":" : "", dgst_raw[i]);
939: strlcat(retval, hex, rlen);
1.1 djm 940: }
941: return retval;
942: }
943:
944: static char *
945: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
946: {
947: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
948: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
949: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
950: u_int i, j = 0, rounds, seed = 1;
951: char *retval;
952:
953: rounds = (dgst_raw_len / 2) + 1;
954: if ((retval = calloc(rounds, 6)) == NULL)
955: return NULL;
956: retval[j++] = 'x';
957: for (i = 0; i < rounds; i++) {
958: u_int idx0, idx1, idx2, idx3, idx4;
959: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
960: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
961: seed) % 6;
962: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
963: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
964: (seed / 6)) % 6;
965: retval[j++] = vowels[idx0];
966: retval[j++] = consonants[idx1];
967: retval[j++] = vowels[idx2];
968: if ((i + 1) < rounds) {
969: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
970: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
971: retval[j++] = consonants[idx3];
972: retval[j++] = '-';
973: retval[j++] = consonants[idx4];
974: seed = ((seed * 5) +
975: ((((u_int)(dgst_raw[2 * i])) * 7) +
976: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
977: }
978: } else {
979: idx0 = seed % 6;
980: idx1 = 16;
981: idx2 = seed / 6;
982: retval[j++] = vowels[idx0];
983: retval[j++] = consonants[idx1];
984: retval[j++] = vowels[idx2];
985: }
986: }
987: retval[j++] = 'x';
988: retval[j++] = '\0';
989: return retval;
990: }
991:
992: /*
993: * Draw an ASCII-Art representing the fingerprint so human brain can
994: * profit from its built-in pattern recognition ability.
995: * This technique is called "random art" and can be found in some
996: * scientific publications like this original paper:
997: *
998: * "Hash Visualization: a New Technique to improve Real-World Security",
999: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1000: * Techniques and E-Commerce (CrypTEC '99)
1001: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1002: *
1003: * The subject came up in a talk by Dan Kaminsky, too.
1004: *
1005: * If you see the picture is different, the key is different.
1006: * If the picture looks the same, you still know nothing.
1007: *
1008: * The algorithm used here is a worm crawling over a discrete plane,
1009: * leaving a trace (augmenting the field) everywhere it goes.
1010: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1011: * makes the respective movement vector be ignored for this turn.
1012: * Graphs are not unambiguous, because circles in graphs can be
1013: * walked in either direction.
1014: */
1015:
1016: /*
1017: * Field sizes for the random art. Have to be odd, so the starting point
1018: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1019: * Else pictures would be too dense, and drawing the frame would
1020: * fail, too, because the key type would not fit in anymore.
1021: */
1022: #define FLDBASE 8
1023: #define FLDSIZE_Y (FLDBASE + 1)
1024: #define FLDSIZE_X (FLDBASE * 2 + 1)
1025: static char *
1.7 djm 1026: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1027: const struct sshkey *k)
1028: {
1029: /*
1030: * Chars to be used after each other every time the worm
1031: * intersects with itself. Matter of taste.
1032: */
1033: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1034: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1035: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1036: size_t i, tlen, hlen;
1.1 djm 1037: u_int b;
1.3 djm 1038: int x, y, r;
1.1 djm 1039: size_t len = strlen(augmentation_string) - 1;
1040:
1041: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1042: return NULL;
1043:
1044: /* initialize field */
1045: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1046: x = FLDSIZE_X / 2;
1047: y = FLDSIZE_Y / 2;
1048:
1049: /* process raw key */
1050: for (i = 0; i < dgst_raw_len; i++) {
1051: int input;
1052: /* each byte conveys four 2-bit move commands */
1053: input = dgst_raw[i];
1054: for (b = 0; b < 4; b++) {
1055: /* evaluate 2 bit, rest is shifted later */
1056: x += (input & 0x1) ? 1 : -1;
1057: y += (input & 0x2) ? 1 : -1;
1058:
1059: /* assure we are still in bounds */
1.37 deraadt 1060: x = MAXIMUM(x, 0);
1061: y = MAXIMUM(y, 0);
1062: x = MINIMUM(x, FLDSIZE_X - 1);
1063: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1064:
1065: /* augment the field */
1066: if (field[x][y] < len - 2)
1067: field[x][y]++;
1068: input = input >> 2;
1069: }
1070: }
1071:
1072: /* mark starting point and end point*/
1073: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1074: field[x][y] = len;
1075:
1.3 djm 1076: /* assemble title */
1077: r = snprintf(title, sizeof(title), "[%s %u]",
1078: sshkey_type(k), sshkey_size(k));
1079: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1080: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1081: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1082: tlen = (r <= 0) ? 0 : strlen(title);
1083:
1084: /* assemble hash ID. */
1085: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1086: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1087:
1088: /* output upper border */
1.3 djm 1089: p = retval;
1090: *p++ = '+';
1091: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1092: *p++ = '-';
1093: memcpy(p, title, tlen);
1094: p += tlen;
1.7 djm 1095: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1096: *p++ = '-';
1097: *p++ = '+';
1098: *p++ = '\n';
1099:
1100: /* output content */
1101: for (y = 0; y < FLDSIZE_Y; y++) {
1102: *p++ = '|';
1103: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1104: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1105: *p++ = '|';
1106: *p++ = '\n';
1107: }
1108:
1109: /* output lower border */
1110: *p++ = '+';
1.7 djm 1111: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1112: *p++ = '-';
1113: memcpy(p, hash, hlen);
1114: p += hlen;
1115: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1116: *p++ = '-';
1117: *p++ = '+';
1118:
1119: return retval;
1120: }
1121:
1122: char *
1.7 djm 1123: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1124: enum sshkey_fp_rep dgst_rep)
1125: {
1126: char *retval = NULL;
1127: u_char *dgst_raw;
1128: size_t dgst_raw_len;
1129:
1.7 djm 1130: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1131: return NULL;
1132: switch (dgst_rep) {
1.7 djm 1133: case SSH_FP_DEFAULT:
1134: if (dgst_alg == SSH_DIGEST_MD5) {
1135: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1136: dgst_raw, dgst_raw_len);
1137: } else {
1138: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1139: dgst_raw, dgst_raw_len);
1140: }
1141: break;
1.1 djm 1142: case SSH_FP_HEX:
1.7 djm 1143: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1144: dgst_raw, dgst_raw_len);
1145: break;
1146: case SSH_FP_BASE64:
1147: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1148: dgst_raw, dgst_raw_len);
1.1 djm 1149: break;
1150: case SSH_FP_BUBBLEBABBLE:
1151: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1152: break;
1153: case SSH_FP_RANDOMART:
1.7 djm 1154: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1155: dgst_raw, dgst_raw_len, k);
1.1 djm 1156: break;
1157: default:
1158: explicit_bzero(dgst_raw, dgst_raw_len);
1159: free(dgst_raw);
1160: return NULL;
1161: }
1162: explicit_bzero(dgst_raw, dgst_raw_len);
1163: free(dgst_raw);
1164: return retval;
1165: }
1166:
1167: #ifdef WITH_SSH1
1168: /*
1169: * Reads a multiple-precision integer in decimal from the buffer, and advances
1170: * the pointer. The integer must already be initialized. This function is
1171: * permitted to modify the buffer. This leaves *cpp to point just beyond the
1172: * last processed character.
1173: */
1174: static int
1175: read_decimal_bignum(char **cpp, BIGNUM *v)
1176: {
1177: char *cp;
1178: size_t e;
1179: int skip = 1; /* skip white space */
1180:
1181: cp = *cpp;
1182: while (*cp == ' ' || *cp == '\t')
1183: cp++;
1184: e = strspn(cp, "0123456789");
1185: if (e == 0)
1186: return SSH_ERR_INVALID_FORMAT;
1187: if (e > SSHBUF_MAX_BIGNUM * 3)
1188: return SSH_ERR_BIGNUM_TOO_LARGE;
1189: if (cp[e] == '\0')
1190: skip = 0;
1.26 millert 1191: else if (strchr(" \t\r\n", cp[e]) == NULL)
1.1 djm 1192: return SSH_ERR_INVALID_FORMAT;
1193: cp[e] = '\0';
1194: if (BN_dec2bn(&v, cp) <= 0)
1195: return SSH_ERR_INVALID_FORMAT;
1196: *cpp = cp + e + skip;
1197: return 0;
1198: }
1199: #endif /* WITH_SSH1 */
1200:
1201: /* returns 0 ok, and < 0 error */
1202: int
1203: sshkey_read(struct sshkey *ret, char **cpp)
1204: {
1205: struct sshkey *k;
1206: int retval = SSH_ERR_INVALID_FORMAT;
1.25 djm 1207: char *ep, *cp, *space;
1.1 djm 1208: int r, type, curve_nid = -1;
1209: struct sshbuf *blob;
1210: #ifdef WITH_SSH1
1211: u_long bits;
1212: #endif /* WITH_SSH1 */
1213:
1214: cp = *cpp;
1215:
1216: switch (ret->type) {
1217: case KEY_RSA1:
1218: #ifdef WITH_SSH1
1219: /* Get number of bits. */
1220: bits = strtoul(cp, &ep, 10);
1.26 millert 1221: if (*cp == '\0' || strchr(" \t\r\n", *ep) == NULL ||
1.1 djm 1222: bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1223: return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1224: /* Get public exponent, public modulus. */
1225: if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1226: return r;
1227: if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1228: return r;
1229: /* validate the claimed number of bits */
1230: if (BN_num_bits(ret->rsa->n) != (int)bits)
1231: return SSH_ERR_KEY_BITS_MISMATCH;
1.25 djm 1232: *cpp = ep;
1.1 djm 1233: retval = 0;
1234: #endif /* WITH_SSH1 */
1235: break;
1236: case KEY_UNSPEC:
1237: case KEY_RSA:
1238: case KEY_DSA:
1239: case KEY_ECDSA:
1240: case KEY_ED25519:
1241: case KEY_DSA_CERT:
1242: case KEY_ECDSA_CERT:
1243: case KEY_RSA_CERT:
1244: case KEY_ED25519_CERT:
1245: space = strchr(cp, ' ');
1246: if (space == NULL)
1247: return SSH_ERR_INVALID_FORMAT;
1248: *space = '\0';
1249: type = sshkey_type_from_name(cp);
1250: if (sshkey_type_plain(type) == KEY_ECDSA &&
1251: (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1252: return SSH_ERR_EC_CURVE_INVALID;
1253: *space = ' ';
1254: if (type == KEY_UNSPEC)
1255: return SSH_ERR_INVALID_FORMAT;
1256: cp = space+1;
1257: if (*cp == '\0')
1258: return SSH_ERR_INVALID_FORMAT;
1.5 djm 1259: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1260: return SSH_ERR_KEY_TYPE_MISMATCH;
1261: if ((blob = sshbuf_new()) == NULL)
1262: return SSH_ERR_ALLOC_FAIL;
1263: /* trim comment */
1264: space = strchr(cp, ' ');
1.10 markus 1265: if (space) {
1266: /* advance 'space': skip whitespace */
1267: *space++ = '\0';
1268: while (*space == ' ' || *space == '\t')
1269: space++;
1.25 djm 1270: ep = space;
1.10 markus 1271: } else
1.25 djm 1272: ep = cp + strlen(cp);
1.1 djm 1273: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1274: sshbuf_free(blob);
1275: return r;
1276: }
1277: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1278: sshbuf_len(blob), &k)) != 0) {
1279: sshbuf_free(blob);
1280: return r;
1281: }
1282: sshbuf_free(blob);
1283: if (k->type != type) {
1284: sshkey_free(k);
1285: return SSH_ERR_KEY_TYPE_MISMATCH;
1286: }
1287: if (sshkey_type_plain(type) == KEY_ECDSA &&
1288: curve_nid != k->ecdsa_nid) {
1289: sshkey_free(k);
1290: return SSH_ERR_EC_CURVE_MISMATCH;
1291: }
1.5 djm 1292: ret->type = type;
1.1 djm 1293: if (sshkey_is_cert(ret)) {
1294: if (!sshkey_is_cert(k)) {
1295: sshkey_free(k);
1296: return SSH_ERR_EXPECTED_CERT;
1297: }
1298: if (ret->cert != NULL)
1299: cert_free(ret->cert);
1300: ret->cert = k->cert;
1301: k->cert = NULL;
1302: }
1.25 djm 1303: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1304: #ifdef WITH_OPENSSL
1.25 djm 1305: case KEY_RSA:
1.1 djm 1306: if (ret->rsa != NULL)
1307: RSA_free(ret->rsa);
1308: ret->rsa = k->rsa;
1309: k->rsa = NULL;
1310: #ifdef DEBUG_PK
1311: RSA_print_fp(stderr, ret->rsa, 8);
1312: #endif
1.25 djm 1313: break;
1314: case KEY_DSA:
1.1 djm 1315: if (ret->dsa != NULL)
1316: DSA_free(ret->dsa);
1317: ret->dsa = k->dsa;
1318: k->dsa = NULL;
1319: #ifdef DEBUG_PK
1320: DSA_print_fp(stderr, ret->dsa, 8);
1321: #endif
1.25 djm 1322: break;
1323: case KEY_ECDSA:
1.1 djm 1324: if (ret->ecdsa != NULL)
1325: EC_KEY_free(ret->ecdsa);
1326: ret->ecdsa = k->ecdsa;
1327: ret->ecdsa_nid = k->ecdsa_nid;
1328: k->ecdsa = NULL;
1329: k->ecdsa_nid = -1;
1330: #ifdef DEBUG_PK
1331: sshkey_dump_ec_key(ret->ecdsa);
1332: #endif
1.25 djm 1333: break;
1.1 djm 1334: #endif /* WITH_OPENSSL */
1.25 djm 1335: case KEY_ED25519:
1.1 djm 1336: free(ret->ed25519_pk);
1337: ret->ed25519_pk = k->ed25519_pk;
1338: k->ed25519_pk = NULL;
1339: #ifdef DEBUG_PK
1340: /* XXX */
1341: #endif
1.25 djm 1342: break;
1.1 djm 1343: }
1.25 djm 1344: *cpp = ep;
1.1 djm 1345: retval = 0;
1346: /*XXXX*/
1347: sshkey_free(k);
1348: if (retval != 0)
1349: break;
1350: break;
1351: default:
1352: return SSH_ERR_INVALID_ARGUMENT;
1353: }
1354: return retval;
1355: }
1356:
1357: int
1.19 djm 1358: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1359: {
1.19 djm 1360: int r = SSH_ERR_INTERNAL_ERROR;
1361: struct sshbuf *b = NULL;
1.1 djm 1362: char *uu = NULL;
1.19 djm 1363:
1364: if (b64p != NULL)
1365: *b64p = NULL;
1366: if ((b = sshbuf_new()) == NULL)
1367: return SSH_ERR_ALLOC_FAIL;
1368: if ((r = sshkey_putb(key, b)) != 0)
1369: goto out;
1370: if ((uu = sshbuf_dtob64(b)) == NULL) {
1371: r = SSH_ERR_ALLOC_FAIL;
1372: goto out;
1373: }
1374: /* Success */
1375: if (b64p != NULL) {
1376: *b64p = uu;
1377: uu = NULL;
1378: }
1379: r = 0;
1380: out:
1381: sshbuf_free(b);
1382: free(uu);
1383: return r;
1384: }
1385:
1386: static int
1387: sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
1388: {
1389: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1390: #ifdef WITH_SSH1
1391: u_int bits = 0;
1392: char *dec_e = NULL, *dec_n = NULL;
1393:
1.19 djm 1394: if (key->rsa == NULL || key->rsa->e == NULL ||
1395: key->rsa->n == NULL) {
1396: r = SSH_ERR_INVALID_ARGUMENT;
1397: goto out;
1398: }
1399: if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1400: (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1401: r = SSH_ERR_ALLOC_FAIL;
1402: goto out;
1403: }
1404: /* size of modulus 'n' */
1405: if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1406: r = SSH_ERR_INVALID_ARGUMENT;
1407: goto out;
1.1 djm 1408: }
1.19 djm 1409: if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1410: goto out;
1411:
1412: /* Success */
1413: r = 0;
1414: out:
1415: if (dec_e != NULL)
1416: OPENSSL_free(dec_e);
1417: if (dec_n != NULL)
1418: OPENSSL_free(dec_n);
1.1 djm 1419: #endif /* WITH_SSH1 */
1.19 djm 1420:
1421: return r;
1422: }
1423:
1424: static int
1425: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1426: {
1427: int r = SSH_ERR_INTERNAL_ERROR;
1428: char *uu = NULL;
1429:
1430: if (key->type == KEY_RSA1) {
1431: if ((r = sshkey_format_rsa1(key, b)) != 0)
1.1 djm 1432: goto out;
1.19 djm 1433: } else {
1434: /* Unsupported key types handled in sshkey_to_base64() */
1435: if ((r = sshkey_to_base64(key, &uu)) != 0)
1.1 djm 1436: goto out;
1.19 djm 1437: if ((r = sshbuf_putf(b, "%s %s",
1438: sshkey_ssh_name(key), uu)) != 0)
1.1 djm 1439: goto out;
1.19 djm 1440: }
1441: r = 0;
1442: out:
1443: free(uu);
1444: return r;
1445: }
1446:
1447: int
1448: sshkey_write(const struct sshkey *key, FILE *f)
1449: {
1450: struct sshbuf *b = NULL;
1451: int r = SSH_ERR_INTERNAL_ERROR;
1452:
1453: if ((b = sshbuf_new()) == NULL)
1454: return SSH_ERR_ALLOC_FAIL;
1455: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1456: goto out;
1457: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1458: if (feof(f))
1459: errno = EPIPE;
1.19 djm 1460: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1461: goto out;
1462: }
1.19 djm 1463: /* Success */
1464: r = 0;
1.1 djm 1465: out:
1.19 djm 1466: sshbuf_free(b);
1467: return r;
1.1 djm 1468: }
1469:
1470: const char *
1471: sshkey_cert_type(const struct sshkey *k)
1472: {
1473: switch (k->cert->type) {
1474: case SSH2_CERT_TYPE_USER:
1475: return "user";
1476: case SSH2_CERT_TYPE_HOST:
1477: return "host";
1478: default:
1479: return "unknown";
1480: }
1481: }
1482:
1483: #ifdef WITH_OPENSSL
1484: static int
1485: rsa_generate_private_key(u_int bits, RSA **rsap)
1486: {
1487: RSA *private = NULL;
1488: BIGNUM *f4 = NULL;
1489: int ret = SSH_ERR_INTERNAL_ERROR;
1490:
1491: if (rsap == NULL ||
1492: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1493: bits > SSHBUF_MAX_BIGNUM * 8)
1494: return SSH_ERR_INVALID_ARGUMENT;
1495: *rsap = NULL;
1496: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1497: ret = SSH_ERR_ALLOC_FAIL;
1498: goto out;
1499: }
1500: if (!BN_set_word(f4, RSA_F4) ||
1501: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1502: ret = SSH_ERR_LIBCRYPTO_ERROR;
1503: goto out;
1504: }
1505: *rsap = private;
1506: private = NULL;
1507: ret = 0;
1508: out:
1509: if (private != NULL)
1510: RSA_free(private);
1511: if (f4 != NULL)
1512: BN_free(f4);
1513: return ret;
1514: }
1515:
1516: static int
1517: dsa_generate_private_key(u_int bits, DSA **dsap)
1518: {
1519: DSA *private;
1520: int ret = SSH_ERR_INTERNAL_ERROR;
1521:
1522: if (dsap == NULL || bits != 1024)
1523: return SSH_ERR_INVALID_ARGUMENT;
1524: if ((private = DSA_new()) == NULL) {
1525: ret = SSH_ERR_ALLOC_FAIL;
1526: goto out;
1527: }
1528: *dsap = NULL;
1529: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1530: NULL, NULL) || !DSA_generate_key(private)) {
1531: ret = SSH_ERR_LIBCRYPTO_ERROR;
1532: goto out;
1533: }
1534: *dsap = private;
1535: private = NULL;
1536: ret = 0;
1537: out:
1538: if (private != NULL)
1539: DSA_free(private);
1540: return ret;
1541: }
1542:
1543: int
1544: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1545: {
1546: EC_GROUP *eg;
1547: int nids[] = {
1548: NID_X9_62_prime256v1,
1549: NID_secp384r1,
1550: NID_secp521r1,
1551: -1
1552: };
1553: int nid;
1554: u_int i;
1555: BN_CTX *bnctx;
1556: const EC_GROUP *g = EC_KEY_get0_group(k);
1557:
1558: /*
1559: * The group may be stored in a ASN.1 encoded private key in one of two
1560: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1561: * or explicit group parameters encoded into the key blob. Only the
1562: * "named group" case sets the group NID for us, but we can figure
1563: * it out for the other case by comparing against all the groups that
1564: * are supported.
1565: */
1566: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1567: return nid;
1568: if ((bnctx = BN_CTX_new()) == NULL)
1569: return -1;
1570: for (i = 0; nids[i] != -1; i++) {
1571: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1572: BN_CTX_free(bnctx);
1573: return -1;
1574: }
1575: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1576: break;
1577: EC_GROUP_free(eg);
1578: }
1579: BN_CTX_free(bnctx);
1580: if (nids[i] != -1) {
1581: /* Use the group with the NID attached */
1582: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1583: if (EC_KEY_set_group(k, eg) != 1) {
1584: EC_GROUP_free(eg);
1585: return -1;
1586: }
1587: }
1588: return nids[i];
1589: }
1590:
1591: static int
1592: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1593: {
1594: EC_KEY *private;
1595: int ret = SSH_ERR_INTERNAL_ERROR;
1596:
1597: if (nid == NULL || ecdsap == NULL ||
1598: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1599: return SSH_ERR_INVALID_ARGUMENT;
1600: *ecdsap = NULL;
1601: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1602: ret = SSH_ERR_ALLOC_FAIL;
1603: goto out;
1604: }
1605: if (EC_KEY_generate_key(private) != 1) {
1606: ret = SSH_ERR_LIBCRYPTO_ERROR;
1607: goto out;
1608: }
1609: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1610: *ecdsap = private;
1611: private = NULL;
1612: ret = 0;
1613: out:
1614: if (private != NULL)
1615: EC_KEY_free(private);
1616: return ret;
1617: }
1618: #endif /* WITH_OPENSSL */
1619:
1620: int
1621: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1622: {
1623: struct sshkey *k;
1624: int ret = SSH_ERR_INTERNAL_ERROR;
1625:
1626: if (keyp == NULL)
1627: return SSH_ERR_INVALID_ARGUMENT;
1628: *keyp = NULL;
1629: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1630: return SSH_ERR_ALLOC_FAIL;
1631: switch (type) {
1632: case KEY_ED25519:
1633: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1634: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1635: ret = SSH_ERR_ALLOC_FAIL;
1636: break;
1637: }
1638: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1639: ret = 0;
1640: break;
1641: #ifdef WITH_OPENSSL
1642: case KEY_DSA:
1643: ret = dsa_generate_private_key(bits, &k->dsa);
1644: break;
1645: case KEY_ECDSA:
1646: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1647: &k->ecdsa);
1648: break;
1649: case KEY_RSA:
1650: case KEY_RSA1:
1651: ret = rsa_generate_private_key(bits, &k->rsa);
1652: break;
1653: #endif /* WITH_OPENSSL */
1654: default:
1655: ret = SSH_ERR_INVALID_ARGUMENT;
1656: }
1657: if (ret == 0) {
1658: k->type = type;
1659: *keyp = k;
1660: } else
1661: sshkey_free(k);
1662: return ret;
1663: }
1664:
1665: int
1666: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1667: {
1668: u_int i;
1669: const struct sshkey_cert *from;
1670: struct sshkey_cert *to;
1671: int ret = SSH_ERR_INTERNAL_ERROR;
1672:
1673: if (to_key->cert != NULL) {
1674: cert_free(to_key->cert);
1675: to_key->cert = NULL;
1676: }
1677:
1678: if ((from = from_key->cert) == NULL)
1679: return SSH_ERR_INVALID_ARGUMENT;
1680:
1681: if ((to = to_key->cert = cert_new()) == NULL)
1682: return SSH_ERR_ALLOC_FAIL;
1683:
1684: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1685: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1.22 jsg 1686: (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1.1 djm 1687: return ret;
1688:
1689: to->serial = from->serial;
1690: to->type = from->type;
1691: if (from->key_id == NULL)
1692: to->key_id = NULL;
1693: else if ((to->key_id = strdup(from->key_id)) == NULL)
1694: return SSH_ERR_ALLOC_FAIL;
1695: to->valid_after = from->valid_after;
1696: to->valid_before = from->valid_before;
1697: if (from->signature_key == NULL)
1698: to->signature_key = NULL;
1699: else if ((ret = sshkey_from_private(from->signature_key,
1700: &to->signature_key)) != 0)
1701: return ret;
1702:
1703: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1704: return SSH_ERR_INVALID_ARGUMENT;
1705: if (from->nprincipals > 0) {
1706: if ((to->principals = calloc(from->nprincipals,
1707: sizeof(*to->principals))) == NULL)
1708: return SSH_ERR_ALLOC_FAIL;
1709: for (i = 0; i < from->nprincipals; i++) {
1710: to->principals[i] = strdup(from->principals[i]);
1711: if (to->principals[i] == NULL) {
1712: to->nprincipals = i;
1713: return SSH_ERR_ALLOC_FAIL;
1714: }
1715: }
1716: }
1717: to->nprincipals = from->nprincipals;
1718: return 0;
1719: }
1720:
1721: int
1722: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1723: {
1724: struct sshkey *n = NULL;
1725: int ret = SSH_ERR_INTERNAL_ERROR;
1726:
1.24 djm 1727: *pkp = NULL;
1.1 djm 1728: switch (k->type) {
1729: #ifdef WITH_OPENSSL
1730: case KEY_DSA:
1731: case KEY_DSA_CERT:
1732: if ((n = sshkey_new(k->type)) == NULL)
1733: return SSH_ERR_ALLOC_FAIL;
1734: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1735: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1736: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1737: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1738: sshkey_free(n);
1739: return SSH_ERR_ALLOC_FAIL;
1740: }
1741: break;
1742: case KEY_ECDSA:
1743: case KEY_ECDSA_CERT:
1744: if ((n = sshkey_new(k->type)) == NULL)
1745: return SSH_ERR_ALLOC_FAIL;
1746: n->ecdsa_nid = k->ecdsa_nid;
1747: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1748: if (n->ecdsa == NULL) {
1749: sshkey_free(n);
1750: return SSH_ERR_ALLOC_FAIL;
1751: }
1752: if (EC_KEY_set_public_key(n->ecdsa,
1753: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1754: sshkey_free(n);
1755: return SSH_ERR_LIBCRYPTO_ERROR;
1756: }
1757: break;
1758: case KEY_RSA:
1759: case KEY_RSA1:
1760: case KEY_RSA_CERT:
1761: if ((n = sshkey_new(k->type)) == NULL)
1762: return SSH_ERR_ALLOC_FAIL;
1763: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1764: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1765: sshkey_free(n);
1766: return SSH_ERR_ALLOC_FAIL;
1767: }
1768: break;
1769: #endif /* WITH_OPENSSL */
1770: case KEY_ED25519:
1771: case KEY_ED25519_CERT:
1772: if ((n = sshkey_new(k->type)) == NULL)
1773: return SSH_ERR_ALLOC_FAIL;
1774: if (k->ed25519_pk != NULL) {
1775: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1776: sshkey_free(n);
1777: return SSH_ERR_ALLOC_FAIL;
1778: }
1779: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1780: }
1781: break;
1782: default:
1783: return SSH_ERR_KEY_TYPE_UNKNOWN;
1784: }
1785: if (sshkey_is_cert(k)) {
1786: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1787: sshkey_free(n);
1788: return ret;
1789: }
1790: }
1791: *pkp = n;
1792: return 0;
1793: }
1794:
1795: static int
1.14 djm 1796: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1797: {
1.14 djm 1798: struct sshbuf *principals = NULL, *crit = NULL;
1799: struct sshbuf *exts = NULL, *ca = NULL;
1800: u_char *sig = NULL;
1801: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1802: int ret = SSH_ERR_INTERNAL_ERROR;
1803:
1804: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1805: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1806: return ret;
1807:
1.20 djm 1808: /* Parse body of certificate up to signature */
1809: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1810: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1811: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1812: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1813: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1814: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1815: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1816: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1817: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1818: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1819: /* XXX debug print error for ret */
1820: ret = SSH_ERR_INVALID_FORMAT;
1821: goto out;
1822: }
1823:
1824: /* Signature is left in the buffer so we can calculate this length */
1825: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1826:
1827: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1828: ret = SSH_ERR_INVALID_FORMAT;
1829: goto out;
1830: }
1831:
1832: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1833: key->cert->type != SSH2_CERT_TYPE_HOST) {
1834: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1835: goto out;
1836: }
1837:
1.4 djm 1838: /* Parse principals section */
1839: while (sshbuf_len(principals) > 0) {
1840: char *principal = NULL;
1841: char **oprincipals = NULL;
1842:
1.1 djm 1843: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1844: ret = SSH_ERR_INVALID_FORMAT;
1845: goto out;
1846: }
1.4 djm 1847: if ((ret = sshbuf_get_cstring(principals, &principal,
1848: NULL)) != 0) {
1.1 djm 1849: ret = SSH_ERR_INVALID_FORMAT;
1850: goto out;
1851: }
1852: oprincipals = key->cert->principals;
1.20 djm 1853: key->cert->principals = reallocarray(key->cert->principals,
1854: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1.1 djm 1855: if (key->cert->principals == NULL) {
1856: free(principal);
1857: key->cert->principals = oprincipals;
1858: ret = SSH_ERR_ALLOC_FAIL;
1859: goto out;
1860: }
1861: key->cert->principals[key->cert->nprincipals++] = principal;
1862: }
1863:
1.4 djm 1864: /*
1865: * Stash a copies of the critical options and extensions sections
1866: * for later use.
1867: */
1868: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1869: (exts != NULL &&
1870: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1871: goto out;
1872:
1.4 djm 1873: /*
1874: * Validate critical options and extensions sections format.
1875: */
1876: while (sshbuf_len(crit) != 0) {
1877: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1878: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1879: sshbuf_reset(key->cert->critical);
1.1 djm 1880: ret = SSH_ERR_INVALID_FORMAT;
1881: goto out;
1882: }
1883: }
1.4 djm 1884: while (exts != NULL && sshbuf_len(exts) != 0) {
1885: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1886: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1887: sshbuf_reset(key->cert->extensions);
1.1 djm 1888: ret = SSH_ERR_INVALID_FORMAT;
1889: goto out;
1890: }
1891: }
1892:
1.4 djm 1893: /* Parse CA key and check signature */
1.14 djm 1894: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1895: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1896: goto out;
1897: }
1898: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1899: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1900: goto out;
1901: }
1902: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1903: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1904: goto out;
1.4 djm 1905:
1906: /* Success */
1.1 djm 1907: ret = 0;
1908: out:
1.14 djm 1909: sshbuf_free(ca);
1.4 djm 1910: sshbuf_free(crit);
1911: sshbuf_free(exts);
1912: sshbuf_free(principals);
1.1 djm 1913: free(sig);
1914: return ret;
1915: }
1916:
1917: static int
1.14 djm 1918: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1919: int allow_cert)
1.1 djm 1920: {
1.12 djm 1921: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1922: char *ktype = NULL, *curve = NULL;
1923: struct sshkey *key = NULL;
1924: size_t len;
1925: u_char *pk = NULL;
1.14 djm 1926: struct sshbuf *copy;
1.1 djm 1927: #ifdef WITH_OPENSSL
1928: EC_POINT *q = NULL;
1929: #endif /* WITH_OPENSSL */
1930:
1931: #ifdef DEBUG_PK /* XXX */
1.14 djm 1932: sshbuf_dump(b, stderr);
1.1 djm 1933: #endif
1.32 djm 1934: if (keyp != NULL)
1935: *keyp = NULL;
1.14 djm 1936: if ((copy = sshbuf_fromb(b)) == NULL) {
1937: ret = SSH_ERR_ALLOC_FAIL;
1938: goto out;
1939: }
1.1 djm 1940: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1941: ret = SSH_ERR_INVALID_FORMAT;
1942: goto out;
1943: }
1944:
1945: type = sshkey_type_from_name(ktype);
1946: if (!allow_cert && sshkey_type_is_cert(type)) {
1947: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1948: goto out;
1949: }
1950: switch (type) {
1951: #ifdef WITH_OPENSSL
1952: case KEY_RSA_CERT:
1.14 djm 1953: /* Skip nonce */
1.1 djm 1954: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1955: ret = SSH_ERR_INVALID_FORMAT;
1956: goto out;
1957: }
1958: /* FALLTHROUGH */
1959: case KEY_RSA:
1960: if ((key = sshkey_new(type)) == NULL) {
1961: ret = SSH_ERR_ALLOC_FAIL;
1962: goto out;
1963: }
1.16 djm 1964: if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
1965: sshbuf_get_bignum2(b, key->rsa->n) != 0) {
1.1 djm 1966: ret = SSH_ERR_INVALID_FORMAT;
1967: goto out;
1968: }
1969: #ifdef DEBUG_PK
1970: RSA_print_fp(stderr, key->rsa, 8);
1971: #endif
1972: break;
1973: case KEY_DSA_CERT:
1.14 djm 1974: /* Skip nonce */
1.1 djm 1975: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1976: ret = SSH_ERR_INVALID_FORMAT;
1977: goto out;
1978: }
1979: /* FALLTHROUGH */
1980: case KEY_DSA:
1981: if ((key = sshkey_new(type)) == NULL) {
1982: ret = SSH_ERR_ALLOC_FAIL;
1983: goto out;
1984: }
1.16 djm 1985: if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
1986: sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
1987: sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
1988: sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
1.1 djm 1989: ret = SSH_ERR_INVALID_FORMAT;
1990: goto out;
1991: }
1992: #ifdef DEBUG_PK
1993: DSA_print_fp(stderr, key->dsa, 8);
1994: #endif
1995: break;
1996: case KEY_ECDSA_CERT:
1.14 djm 1997: /* Skip nonce */
1.1 djm 1998: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1999: ret = SSH_ERR_INVALID_FORMAT;
2000: goto out;
2001: }
2002: /* FALLTHROUGH */
2003: case KEY_ECDSA:
2004: if ((key = sshkey_new(type)) == NULL) {
2005: ret = SSH_ERR_ALLOC_FAIL;
2006: goto out;
2007: }
1.12 djm 2008: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2009: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2010: ret = SSH_ERR_INVALID_FORMAT;
2011: goto out;
2012: }
2013: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2014: ret = SSH_ERR_EC_CURVE_MISMATCH;
2015: goto out;
2016: }
2017: if (key->ecdsa != NULL)
2018: EC_KEY_free(key->ecdsa);
2019: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2020: == NULL) {
2021: ret = SSH_ERR_EC_CURVE_INVALID;
2022: goto out;
2023: }
2024: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2025: ret = SSH_ERR_ALLOC_FAIL;
2026: goto out;
2027: }
2028: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2029: ret = SSH_ERR_INVALID_FORMAT;
2030: goto out;
2031: }
2032: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2033: q) != 0) {
2034: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2035: goto out;
2036: }
2037: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2038: /* XXX assume it is a allocation error */
2039: ret = SSH_ERR_ALLOC_FAIL;
2040: goto out;
2041: }
2042: #ifdef DEBUG_PK
2043: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2044: #endif
2045: break;
2046: #endif /* WITH_OPENSSL */
2047: case KEY_ED25519_CERT:
1.14 djm 2048: /* Skip nonce */
1.1 djm 2049: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2050: ret = SSH_ERR_INVALID_FORMAT;
2051: goto out;
2052: }
2053: /* FALLTHROUGH */
2054: case KEY_ED25519:
2055: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2056: goto out;
2057: if (len != ED25519_PK_SZ) {
2058: ret = SSH_ERR_INVALID_FORMAT;
2059: goto out;
2060: }
2061: if ((key = sshkey_new(type)) == NULL) {
2062: ret = SSH_ERR_ALLOC_FAIL;
2063: goto out;
2064: }
2065: key->ed25519_pk = pk;
2066: pk = NULL;
2067: break;
2068: case KEY_UNSPEC:
2069: if ((key = sshkey_new(type)) == NULL) {
2070: ret = SSH_ERR_ALLOC_FAIL;
2071: goto out;
2072: }
2073: break;
2074: default:
2075: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2076: goto out;
2077: }
2078:
2079: /* Parse certificate potion */
1.14 djm 2080: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2081: goto out;
2082:
2083: if (key != NULL && sshbuf_len(b) != 0) {
2084: ret = SSH_ERR_INVALID_FORMAT;
2085: goto out;
2086: }
2087: ret = 0;
1.32 djm 2088: if (keyp != NULL) {
2089: *keyp = key;
2090: key = NULL;
2091: }
1.1 djm 2092: out:
1.14 djm 2093: sshbuf_free(copy);
1.1 djm 2094: sshkey_free(key);
2095: free(ktype);
2096: free(curve);
2097: free(pk);
2098: #ifdef WITH_OPENSSL
2099: if (q != NULL)
2100: EC_POINT_free(q);
2101: #endif /* WITH_OPENSSL */
2102: return ret;
2103: }
2104:
2105: int
2106: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2107: {
1.14 djm 2108: struct sshbuf *b;
2109: int r;
2110:
2111: if ((b = sshbuf_from(blob, blen)) == NULL)
2112: return SSH_ERR_ALLOC_FAIL;
2113: r = sshkey_from_blob_internal(b, keyp, 1);
2114: sshbuf_free(b);
2115: return r;
2116: }
2117:
2118: int
2119: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2120: {
2121: return sshkey_from_blob_internal(b, keyp, 1);
2122: }
2123:
2124: int
2125: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2126: {
2127: struct sshbuf *b;
2128: int r;
2129:
2130: if ((r = sshbuf_froms(buf, &b)) != 0)
2131: return r;
2132: r = sshkey_from_blob_internal(b, keyp, 1);
2133: sshbuf_free(b);
2134: return r;
1.1 djm 2135: }
2136:
2137: int
2138: sshkey_sign(const struct sshkey *key,
2139: u_char **sigp, size_t *lenp,
1.28 markus 2140: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2141: {
2142: if (sigp != NULL)
2143: *sigp = NULL;
2144: if (lenp != NULL)
2145: *lenp = 0;
2146: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2147: return SSH_ERR_INVALID_ARGUMENT;
2148: switch (key->type) {
2149: #ifdef WITH_OPENSSL
2150: case KEY_DSA_CERT:
2151: case KEY_DSA:
2152: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2153: case KEY_ECDSA_CERT:
2154: case KEY_ECDSA:
2155: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2156: case KEY_RSA_CERT:
2157: case KEY_RSA:
1.28 markus 2158: return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
1.1 djm 2159: #endif /* WITH_OPENSSL */
2160: case KEY_ED25519:
2161: case KEY_ED25519_CERT:
2162: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2163: default:
2164: return SSH_ERR_KEY_TYPE_UNKNOWN;
2165: }
2166: }
2167:
2168: /*
2169: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2170: */
2171: int
2172: sshkey_verify(const struct sshkey *key,
2173: const u_char *sig, size_t siglen,
2174: const u_char *data, size_t dlen, u_int compat)
2175: {
1.6 djm 2176: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2177: return SSH_ERR_INVALID_ARGUMENT;
2178: switch (key->type) {
2179: #ifdef WITH_OPENSSL
2180: case KEY_DSA_CERT:
2181: case KEY_DSA:
2182: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2183: case KEY_ECDSA_CERT:
2184: case KEY_ECDSA:
2185: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2186: case KEY_RSA_CERT:
2187: case KEY_RSA:
1.28 markus 2188: return ssh_rsa_verify(key, sig, siglen, data, dlen);
1.1 djm 2189: #endif /* WITH_OPENSSL */
2190: case KEY_ED25519:
2191: case KEY_ED25519_CERT:
2192: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2193: default:
2194: return SSH_ERR_KEY_TYPE_UNKNOWN;
2195: }
2196: }
2197:
2198: /* Converts a private to a public key */
2199: int
2200: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2201: {
2202: struct sshkey *pk;
2203: int ret = SSH_ERR_INTERNAL_ERROR;
2204:
1.24 djm 2205: *dkp = NULL;
1.1 djm 2206: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2207: return SSH_ERR_ALLOC_FAIL;
2208: pk->type = k->type;
2209: pk->flags = k->flags;
2210: pk->ecdsa_nid = k->ecdsa_nid;
2211: pk->dsa = NULL;
2212: pk->ecdsa = NULL;
2213: pk->rsa = NULL;
2214: pk->ed25519_pk = NULL;
2215: pk->ed25519_sk = NULL;
2216:
2217: switch (k->type) {
2218: #ifdef WITH_OPENSSL
2219: case KEY_RSA_CERT:
2220: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2221: goto fail;
2222: /* FALLTHROUGH */
2223: case KEY_RSA1:
2224: case KEY_RSA:
2225: if ((pk->rsa = RSA_new()) == NULL ||
2226: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2227: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2228: ret = SSH_ERR_ALLOC_FAIL;
2229: goto fail;
2230: }
2231: break;
2232: case KEY_DSA_CERT:
2233: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2234: goto fail;
2235: /* FALLTHROUGH */
2236: case KEY_DSA:
2237: if ((pk->dsa = DSA_new()) == NULL ||
2238: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2239: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2240: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2241: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2242: ret = SSH_ERR_ALLOC_FAIL;
2243: goto fail;
2244: }
2245: break;
2246: case KEY_ECDSA_CERT:
2247: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2248: goto fail;
2249: /* FALLTHROUGH */
2250: case KEY_ECDSA:
2251: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2252: if (pk->ecdsa == NULL) {
2253: ret = SSH_ERR_ALLOC_FAIL;
2254: goto fail;
2255: }
2256: if (EC_KEY_set_public_key(pk->ecdsa,
2257: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2258: ret = SSH_ERR_LIBCRYPTO_ERROR;
2259: goto fail;
2260: }
2261: break;
2262: #endif /* WITH_OPENSSL */
2263: case KEY_ED25519_CERT:
2264: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2265: goto fail;
2266: /* FALLTHROUGH */
2267: case KEY_ED25519:
2268: if (k->ed25519_pk != NULL) {
2269: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2270: ret = SSH_ERR_ALLOC_FAIL;
2271: goto fail;
2272: }
2273: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2274: }
2275: break;
2276: default:
2277: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2278: fail:
2279: sshkey_free(pk);
2280: return ret;
2281: }
2282: *dkp = pk;
2283: return 0;
2284: }
2285:
2286: /* Convert a plain key to their _CERT equivalent */
2287: int
1.20 djm 2288: sshkey_to_certified(struct sshkey *k)
1.1 djm 2289: {
2290: int newtype;
2291:
2292: switch (k->type) {
2293: #ifdef WITH_OPENSSL
2294: case KEY_RSA:
1.20 djm 2295: newtype = KEY_RSA_CERT;
1.1 djm 2296: break;
2297: case KEY_DSA:
1.20 djm 2298: newtype = KEY_DSA_CERT;
1.1 djm 2299: break;
2300: case KEY_ECDSA:
2301: newtype = KEY_ECDSA_CERT;
2302: break;
2303: #endif /* WITH_OPENSSL */
2304: case KEY_ED25519:
2305: newtype = KEY_ED25519_CERT;
2306: break;
2307: default:
2308: return SSH_ERR_INVALID_ARGUMENT;
2309: }
2310: if ((k->cert = cert_new()) == NULL)
2311: return SSH_ERR_ALLOC_FAIL;
2312: k->type = newtype;
2313: return 0;
2314: }
2315:
2316: /* Convert a certificate to its raw key equivalent */
2317: int
2318: sshkey_drop_cert(struct sshkey *k)
2319: {
2320: if (!sshkey_type_is_cert(k->type))
2321: return SSH_ERR_KEY_TYPE_UNKNOWN;
2322: cert_free(k->cert);
2323: k->cert = NULL;
2324: k->type = sshkey_type_plain(k->type);
2325: return 0;
2326: }
2327:
2328: /* Sign a certified key, (re-)generating the signed certblob. */
2329: int
1.33 djm 2330: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
1.1 djm 2331: {
2332: struct sshbuf *principals = NULL;
2333: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2334: size_t i, ca_len, sig_len;
2335: int ret = SSH_ERR_INTERNAL_ERROR;
2336: struct sshbuf *cert;
2337:
2338: if (k == NULL || k->cert == NULL ||
2339: k->cert->certblob == NULL || ca == NULL)
2340: return SSH_ERR_INVALID_ARGUMENT;
2341: if (!sshkey_is_cert(k))
2342: return SSH_ERR_KEY_TYPE_UNKNOWN;
2343: if (!sshkey_type_is_valid_ca(ca->type))
2344: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2345:
2346: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2347: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2348:
2349: cert = k->cert->certblob; /* for readability */
2350: sshbuf_reset(cert);
2351: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2352: goto out;
2353:
2354: /* -v01 certs put nonce first */
2355: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2356: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2357: goto out;
1.1 djm 2358:
2359: /* XXX this substantially duplicates to_blob(); refactor */
2360: switch (k->type) {
2361: #ifdef WITH_OPENSSL
2362: case KEY_DSA_CERT:
2363: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2364: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2365: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2366: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2367: goto out;
2368: break;
2369: case KEY_ECDSA_CERT:
2370: if ((ret = sshbuf_put_cstring(cert,
2371: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2372: (ret = sshbuf_put_ec(cert,
2373: EC_KEY_get0_public_key(k->ecdsa),
2374: EC_KEY_get0_group(k->ecdsa))) != 0)
2375: goto out;
2376: break;
2377: case KEY_RSA_CERT:
2378: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2379: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2380: goto out;
2381: break;
2382: #endif /* WITH_OPENSSL */
2383: case KEY_ED25519_CERT:
2384: if ((ret = sshbuf_put_string(cert,
2385: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2386: goto out;
2387: break;
2388: default:
2389: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2390: goto out;
1.1 djm 2391: }
2392:
1.20 djm 2393: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2394: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2395: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2396: goto out;
2397:
2398: if ((principals = sshbuf_new()) == NULL) {
2399: ret = SSH_ERR_ALLOC_FAIL;
2400: goto out;
2401: }
2402: for (i = 0; i < k->cert->nprincipals; i++) {
2403: if ((ret = sshbuf_put_cstring(principals,
2404: k->cert->principals[i])) != 0)
2405: goto out;
2406: }
2407: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2408: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2409: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2410: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2411: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2412: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2413: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2414: goto out;
2415:
2416: /* Sign the whole mess */
2417: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.33 djm 2418: sshbuf_len(cert), alg, 0)) != 0)
1.1 djm 2419: goto out;
2420:
2421: /* Append signature and we are done */
2422: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2423: goto out;
2424: ret = 0;
2425: out:
2426: if (ret != 0)
2427: sshbuf_reset(cert);
1.29 mmcc 2428: free(sig_blob);
2429: free(ca_blob);
1.31 mmcc 2430: sshbuf_free(principals);
1.1 djm 2431: return ret;
2432: }
2433:
2434: int
2435: sshkey_cert_check_authority(const struct sshkey *k,
2436: int want_host, int require_principal,
2437: const char *name, const char **reason)
2438: {
2439: u_int i, principal_matches;
2440: time_t now = time(NULL);
2441:
2442: if (reason != NULL)
2443: *reason = NULL;
2444:
2445: if (want_host) {
2446: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2447: *reason = "Certificate invalid: not a host certificate";
2448: return SSH_ERR_KEY_CERT_INVALID;
2449: }
2450: } else {
2451: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2452: *reason = "Certificate invalid: not a user certificate";
2453: return SSH_ERR_KEY_CERT_INVALID;
2454: }
2455: }
2456: if (now < 0) {
2457: /* yikes - system clock before epoch! */
2458: *reason = "Certificate invalid: not yet valid";
2459: return SSH_ERR_KEY_CERT_INVALID;
2460: }
2461: if ((u_int64_t)now < k->cert->valid_after) {
2462: *reason = "Certificate invalid: not yet valid";
2463: return SSH_ERR_KEY_CERT_INVALID;
2464: }
2465: if ((u_int64_t)now >= k->cert->valid_before) {
2466: *reason = "Certificate invalid: expired";
2467: return SSH_ERR_KEY_CERT_INVALID;
2468: }
2469: if (k->cert->nprincipals == 0) {
2470: if (require_principal) {
2471: *reason = "Certificate lacks principal list";
2472: return SSH_ERR_KEY_CERT_INVALID;
2473: }
2474: } else if (name != NULL) {
2475: principal_matches = 0;
2476: for (i = 0; i < k->cert->nprincipals; i++) {
2477: if (strcmp(name, k->cert->principals[i]) == 0) {
2478: principal_matches = 1;
2479: break;
2480: }
2481: }
2482: if (!principal_matches) {
2483: *reason = "Certificate invalid: name is not a listed "
2484: "principal";
2485: return SSH_ERR_KEY_CERT_INVALID;
2486: }
2487: }
2488: return 0;
1.27 djm 2489: }
2490:
2491: size_t
2492: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2493: {
2494: char from[32], to[32], ret[64];
2495: time_t tt;
2496: struct tm *tm;
2497:
2498: *from = *to = '\0';
2499: if (cert->valid_after == 0 &&
2500: cert->valid_before == 0xffffffffffffffffULL)
2501: return strlcpy(s, "forever", l);
2502:
2503: if (cert->valid_after != 0) {
2504: /* XXX revisit INT_MAX in 2038 :) */
2505: tt = cert->valid_after > INT_MAX ?
2506: INT_MAX : cert->valid_after;
2507: tm = localtime(&tt);
2508: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2509: }
2510: if (cert->valid_before != 0xffffffffffffffffULL) {
2511: /* XXX revisit INT_MAX in 2038 :) */
2512: tt = cert->valid_before > INT_MAX ?
2513: INT_MAX : cert->valid_before;
2514: tm = localtime(&tt);
2515: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2516: }
2517:
2518: if (cert->valid_after == 0)
2519: snprintf(ret, sizeof(ret), "before %s", to);
2520: else if (cert->valid_before == 0xffffffffffffffffULL)
2521: snprintf(ret, sizeof(ret), "after %s", from);
2522: else
2523: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2524:
2525: return strlcpy(s, ret, l);
1.1 djm 2526: }
2527:
2528: int
2529: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2530: {
2531: int r = SSH_ERR_INTERNAL_ERROR;
2532:
2533: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2534: goto out;
2535: switch (key->type) {
2536: #ifdef WITH_OPENSSL
2537: case KEY_RSA:
2538: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2539: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2540: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2541: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2542: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2543: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2544: goto out;
2545: break;
2546: case KEY_RSA_CERT:
2547: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2548: r = SSH_ERR_INVALID_ARGUMENT;
2549: goto out;
2550: }
2551: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2552: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2553: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2554: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2555: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2556: goto out;
2557: break;
2558: case KEY_DSA:
2559: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2560: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2561: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2562: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2563: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2564: goto out;
2565: break;
2566: case KEY_DSA_CERT:
2567: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2568: r = SSH_ERR_INVALID_ARGUMENT;
2569: goto out;
2570: }
2571: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2572: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2573: goto out;
2574: break;
2575: case KEY_ECDSA:
2576: if ((r = sshbuf_put_cstring(b,
2577: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2578: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2579: (r = sshbuf_put_bignum2(b,
2580: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2581: goto out;
2582: break;
2583: case KEY_ECDSA_CERT:
2584: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2585: r = SSH_ERR_INVALID_ARGUMENT;
2586: goto out;
2587: }
2588: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2589: (r = sshbuf_put_bignum2(b,
2590: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2591: goto out;
2592: break;
2593: #endif /* WITH_OPENSSL */
2594: case KEY_ED25519:
2595: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2596: ED25519_PK_SZ)) != 0 ||
2597: (r = sshbuf_put_string(b, key->ed25519_sk,
2598: ED25519_SK_SZ)) != 0)
2599: goto out;
2600: break;
2601: case KEY_ED25519_CERT:
2602: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2603: r = SSH_ERR_INVALID_ARGUMENT;
2604: goto out;
2605: }
2606: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2607: (r = sshbuf_put_string(b, key->ed25519_pk,
2608: ED25519_PK_SZ)) != 0 ||
2609: (r = sshbuf_put_string(b, key->ed25519_sk,
2610: ED25519_SK_SZ)) != 0)
2611: goto out;
2612: break;
2613: default:
2614: r = SSH_ERR_INVALID_ARGUMENT;
2615: goto out;
2616: }
2617: /* success */
2618: r = 0;
2619: out:
2620: return r;
2621: }
2622:
2623: int
2624: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2625: {
2626: char *tname = NULL, *curve = NULL;
2627: struct sshkey *k = NULL;
1.14 djm 2628: size_t pklen = 0, sklen = 0;
1.1 djm 2629: int type, r = SSH_ERR_INTERNAL_ERROR;
2630: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2631: #ifdef WITH_OPENSSL
2632: BIGNUM *exponent = NULL;
2633: #endif /* WITH_OPENSSL */
2634:
2635: if (kp != NULL)
2636: *kp = NULL;
2637: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2638: goto out;
2639: type = sshkey_type_from_name(tname);
2640: switch (type) {
2641: #ifdef WITH_OPENSSL
2642: case KEY_DSA:
2643: if ((k = sshkey_new_private(type)) == NULL) {
2644: r = SSH_ERR_ALLOC_FAIL;
2645: goto out;
2646: }
2647: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2648: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2649: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2650: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2651: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2652: goto out;
2653: break;
2654: case KEY_DSA_CERT:
1.14 djm 2655: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2656: (r = sshkey_add_private(k)) != 0 ||
2657: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2658: goto out;
2659: break;
2660: case KEY_ECDSA:
2661: if ((k = sshkey_new_private(type)) == NULL) {
2662: r = SSH_ERR_ALLOC_FAIL;
2663: goto out;
2664: }
2665: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2666: r = SSH_ERR_INVALID_ARGUMENT;
2667: goto out;
2668: }
2669: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2670: goto out;
2671: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2672: r = SSH_ERR_EC_CURVE_MISMATCH;
2673: goto out;
2674: }
2675: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2676: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2677: r = SSH_ERR_LIBCRYPTO_ERROR;
2678: goto out;
2679: }
2680: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2681: (r = sshbuf_get_bignum2(buf, exponent)))
2682: goto out;
2683: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2684: r = SSH_ERR_LIBCRYPTO_ERROR;
2685: goto out;
2686: }
2687: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2688: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2689: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2690: goto out;
2691: break;
2692: case KEY_ECDSA_CERT:
2693: if ((exponent = BN_new()) == NULL) {
2694: r = SSH_ERR_LIBCRYPTO_ERROR;
2695: goto out;
2696: }
1.14 djm 2697: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2698: (r = sshkey_add_private(k)) != 0 ||
2699: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2700: goto out;
2701: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2702: r = SSH_ERR_LIBCRYPTO_ERROR;
2703: goto out;
2704: }
2705: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2706: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2707: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2708: goto out;
2709: break;
2710: case KEY_RSA:
2711: if ((k = sshkey_new_private(type)) == NULL) {
2712: r = SSH_ERR_ALLOC_FAIL;
2713: goto out;
2714: }
2715: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2716: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2717: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2718: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2719: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2720: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2721: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2722: goto out;
2723: break;
2724: case KEY_RSA_CERT:
1.14 djm 2725: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2726: (r = sshkey_add_private(k)) != 0 ||
1.22 jsg 2727: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2728: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2729: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2730: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
1.1 djm 2731: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2732: goto out;
2733: break;
2734: #endif /* WITH_OPENSSL */
2735: case KEY_ED25519:
2736: if ((k = sshkey_new_private(type)) == NULL) {
2737: r = SSH_ERR_ALLOC_FAIL;
2738: goto out;
2739: }
2740: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2741: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2742: goto out;
2743: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2744: r = SSH_ERR_INVALID_FORMAT;
2745: goto out;
2746: }
2747: k->ed25519_pk = ed25519_pk;
2748: k->ed25519_sk = ed25519_sk;
2749: ed25519_pk = ed25519_sk = NULL;
2750: break;
2751: case KEY_ED25519_CERT:
1.14 djm 2752: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2753: (r = sshkey_add_private(k)) != 0 ||
2754: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2755: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2756: goto out;
2757: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2758: r = SSH_ERR_INVALID_FORMAT;
2759: goto out;
2760: }
2761: k->ed25519_pk = ed25519_pk;
2762: k->ed25519_sk = ed25519_sk;
2763: ed25519_pk = ed25519_sk = NULL;
2764: break;
2765: default:
2766: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2767: goto out;
2768: }
2769: #ifdef WITH_OPENSSL
2770: /* enable blinding */
2771: switch (k->type) {
2772: case KEY_RSA:
2773: case KEY_RSA_CERT:
2774: case KEY_RSA1:
2775: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2776: r = SSH_ERR_LIBCRYPTO_ERROR;
2777: goto out;
2778: }
2779: break;
2780: }
2781: #endif /* WITH_OPENSSL */
2782: /* success */
2783: r = 0;
2784: if (kp != NULL) {
2785: *kp = k;
2786: k = NULL;
2787: }
2788: out:
2789: free(tname);
2790: free(curve);
2791: #ifdef WITH_OPENSSL
2792: if (exponent != NULL)
2793: BN_clear_free(exponent);
2794: #endif /* WITH_OPENSSL */
2795: sshkey_free(k);
2796: if (ed25519_pk != NULL) {
2797: explicit_bzero(ed25519_pk, pklen);
2798: free(ed25519_pk);
2799: }
2800: if (ed25519_sk != NULL) {
2801: explicit_bzero(ed25519_sk, sklen);
2802: free(ed25519_sk);
2803: }
2804: return r;
2805: }
2806:
2807: #ifdef WITH_OPENSSL
2808: int
2809: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2810: {
2811: BN_CTX *bnctx;
2812: EC_POINT *nq = NULL;
2813: BIGNUM *order, *x, *y, *tmp;
2814: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2815:
2816: /*
2817: * NB. This assumes OpenSSL has already verified that the public
2818: * point lies on the curve. This is done by EC_POINT_oct2point()
2819: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2820: * reachable with public points not unmarshalled using
2821: * EC_POINT_oct2point then the caller will need to explicitly check.
2822: */
1.1 djm 2823:
2824: if ((bnctx = BN_CTX_new()) == NULL)
2825: return SSH_ERR_ALLOC_FAIL;
2826: BN_CTX_start(bnctx);
2827:
2828: /*
2829: * We shouldn't ever hit this case because bignum_get_ecpoint()
2830: * refuses to load GF2m points.
2831: */
2832: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2833: NID_X9_62_prime_field)
2834: goto out;
2835:
2836: /* Q != infinity */
2837: if (EC_POINT_is_at_infinity(group, public))
2838: goto out;
2839:
2840: if ((x = BN_CTX_get(bnctx)) == NULL ||
2841: (y = BN_CTX_get(bnctx)) == NULL ||
2842: (order = BN_CTX_get(bnctx)) == NULL ||
2843: (tmp = BN_CTX_get(bnctx)) == NULL) {
2844: ret = SSH_ERR_ALLOC_FAIL;
2845: goto out;
2846: }
2847:
2848: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2849: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2850: EC_POINT_get_affine_coordinates_GFp(group, public,
2851: x, y, bnctx) != 1) {
2852: ret = SSH_ERR_LIBCRYPTO_ERROR;
2853: goto out;
2854: }
2855: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2856: BN_num_bits(y) <= BN_num_bits(order) / 2)
2857: goto out;
2858:
2859: /* nQ == infinity (n == order of subgroup) */
2860: if ((nq = EC_POINT_new(group)) == NULL) {
2861: ret = SSH_ERR_ALLOC_FAIL;
2862: goto out;
2863: }
2864: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2865: ret = SSH_ERR_LIBCRYPTO_ERROR;
2866: goto out;
2867: }
2868: if (EC_POINT_is_at_infinity(group, nq) != 1)
2869: goto out;
2870:
2871: /* x < order - 1, y < order - 1 */
2872: if (!BN_sub(tmp, order, BN_value_one())) {
2873: ret = SSH_ERR_LIBCRYPTO_ERROR;
2874: goto out;
2875: }
2876: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2877: goto out;
2878: ret = 0;
2879: out:
2880: BN_CTX_free(bnctx);
2881: if (nq != NULL)
2882: EC_POINT_free(nq);
2883: return ret;
2884: }
2885:
2886: int
2887: sshkey_ec_validate_private(const EC_KEY *key)
2888: {
2889: BN_CTX *bnctx;
2890: BIGNUM *order, *tmp;
2891: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2892:
2893: if ((bnctx = BN_CTX_new()) == NULL)
2894: return SSH_ERR_ALLOC_FAIL;
2895: BN_CTX_start(bnctx);
2896:
2897: if ((order = BN_CTX_get(bnctx)) == NULL ||
2898: (tmp = BN_CTX_get(bnctx)) == NULL) {
2899: ret = SSH_ERR_ALLOC_FAIL;
2900: goto out;
2901: }
2902:
2903: /* log2(private) > log2(order)/2 */
2904: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2905: ret = SSH_ERR_LIBCRYPTO_ERROR;
2906: goto out;
2907: }
2908: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2909: BN_num_bits(order) / 2)
2910: goto out;
2911:
2912: /* private < order - 1 */
2913: if (!BN_sub(tmp, order, BN_value_one())) {
2914: ret = SSH_ERR_LIBCRYPTO_ERROR;
2915: goto out;
2916: }
2917: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2918: goto out;
2919: ret = 0;
2920: out:
2921: BN_CTX_free(bnctx);
2922: return ret;
2923: }
2924:
2925: void
2926: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2927: {
2928: BIGNUM *x, *y;
2929: BN_CTX *bnctx;
2930:
2931: if (point == NULL) {
2932: fputs("point=(NULL)\n", stderr);
2933: return;
2934: }
2935: if ((bnctx = BN_CTX_new()) == NULL) {
2936: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2937: return;
2938: }
2939: BN_CTX_start(bnctx);
2940: if ((x = BN_CTX_get(bnctx)) == NULL ||
2941: (y = BN_CTX_get(bnctx)) == NULL) {
2942: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2943: return;
2944: }
2945: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2946: NID_X9_62_prime_field) {
2947: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2948: return;
2949: }
2950: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2951: bnctx) != 1) {
2952: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2953: __func__);
2954: return;
2955: }
2956: fputs("x=", stderr);
2957: BN_print_fp(stderr, x);
2958: fputs("\ny=", stderr);
2959: BN_print_fp(stderr, y);
2960: fputs("\n", stderr);
2961: BN_CTX_free(bnctx);
2962: }
2963:
2964: void
2965: sshkey_dump_ec_key(const EC_KEY *key)
2966: {
2967: const BIGNUM *exponent;
2968:
2969: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2970: EC_KEY_get0_public_key(key));
2971: fputs("exponent=", stderr);
2972: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2973: fputs("(NULL)", stderr);
2974: else
2975: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2976: fputs("\n", stderr);
2977: }
2978: #endif /* WITH_OPENSSL */
2979:
2980: static int
2981: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2982: const char *passphrase, const char *comment, const char *ciphername,
2983: int rounds)
2984: {
1.4 djm 2985: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2986: u_char salt[SALT_LEN];
1.4 djm 2987: char *b64 = NULL;
1.1 djm 2988: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2989: u_int check;
2990: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 2991: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 2992: const struct sshcipher *cipher;
2993: const char *kdfname = KDFNAME;
2994: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2995:
2996: if (rounds <= 0)
2997: rounds = DEFAULT_ROUNDS;
2998: if (passphrase == NULL || !strlen(passphrase)) {
2999: ciphername = "none";
3000: kdfname = "none";
3001: } else if (ciphername == NULL)
3002: ciphername = DEFAULT_CIPHERNAME;
3003: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
3004: r = SSH_ERR_INVALID_ARGUMENT;
3005: goto out;
3006: }
3007: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3008: r = SSH_ERR_INTERNAL_ERROR;
3009: goto out;
3010: }
3011:
3012: if ((kdf = sshbuf_new()) == NULL ||
3013: (encoded = sshbuf_new()) == NULL ||
3014: (encrypted = sshbuf_new()) == NULL) {
3015: r = SSH_ERR_ALLOC_FAIL;
3016: goto out;
3017: }
3018: blocksize = cipher_blocksize(cipher);
3019: keylen = cipher_keylen(cipher);
3020: ivlen = cipher_ivlen(cipher);
3021: authlen = cipher_authlen(cipher);
3022: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3023: r = SSH_ERR_ALLOC_FAIL;
3024: goto out;
3025: }
3026: if (strcmp(kdfname, "bcrypt") == 0) {
3027: arc4random_buf(salt, SALT_LEN);
3028: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3029: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3030: r = SSH_ERR_INVALID_ARGUMENT;
3031: goto out;
3032: }
3033: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3034: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3035: goto out;
3036: } else if (strcmp(kdfname, "none") != 0) {
3037: /* Unsupported KDF type */
3038: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3039: goto out;
3040: }
3041: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3042: key + keylen, ivlen, 1)) != 0)
3043: goto out;
3044:
3045: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3046: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3047: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3048: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3049: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3050: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3051: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3052: goto out;
3053:
3054: /* set up the buffer that will be encrypted */
3055:
3056: /* Random check bytes */
3057: check = arc4random();
3058: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3059: (r = sshbuf_put_u32(encrypted, check)) != 0)
3060: goto out;
3061:
3062: /* append private key and comment*/
3063: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3064: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3065: goto out;
3066:
3067: /* padding */
3068: i = 0;
3069: while (sshbuf_len(encrypted) % blocksize) {
3070: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3071: goto out;
3072: }
3073:
3074: /* length in destination buffer */
3075: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3076: goto out;
3077:
3078: /* encrypt */
3079: if ((r = sshbuf_reserve(encoded,
3080: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3081: goto out;
1.36 djm 3082: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3083: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3084: goto out;
3085:
3086: /* uuencode */
3087: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3088: r = SSH_ERR_ALLOC_FAIL;
3089: goto out;
3090: }
3091:
3092: sshbuf_reset(blob);
3093: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3094: goto out;
3095: for (i = 0; i < strlen(b64); i++) {
3096: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3097: goto out;
3098: /* insert line breaks */
3099: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3100: goto out;
3101: }
3102: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3103: goto out;
3104: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3105: goto out;
3106:
3107: /* success */
3108: r = 0;
3109:
3110: out:
3111: sshbuf_free(kdf);
3112: sshbuf_free(encoded);
3113: sshbuf_free(encrypted);
1.36 djm 3114: cipher_free(ciphercontext);
1.1 djm 3115: explicit_bzero(salt, sizeof(salt));
3116: if (key != NULL) {
3117: explicit_bzero(key, keylen + ivlen);
3118: free(key);
3119: }
3120: if (pubkeyblob != NULL) {
3121: explicit_bzero(pubkeyblob, pubkeylen);
3122: free(pubkeyblob);
3123: }
3124: if (b64 != NULL) {
3125: explicit_bzero(b64, strlen(b64));
3126: free(b64);
3127: }
3128: return r;
3129: }
3130:
3131: static int
3132: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3133: struct sshkey **keyp, char **commentp)
3134: {
3135: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3136: const struct sshcipher *cipher = NULL;
3137: const u_char *cp;
3138: int r = SSH_ERR_INTERNAL_ERROR;
3139: size_t encoded_len;
1.18 djm 3140: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3141: struct sshbuf *encoded = NULL, *decoded = NULL;
3142: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3143: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3144: struct sshkey *k = NULL;
3145: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3146: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3147:
3148: if (keyp != NULL)
3149: *keyp = NULL;
3150: if (commentp != NULL)
3151: *commentp = NULL;
3152:
3153: if ((encoded = sshbuf_new()) == NULL ||
3154: (decoded = sshbuf_new()) == NULL ||
3155: (decrypted = sshbuf_new()) == NULL) {
3156: r = SSH_ERR_ALLOC_FAIL;
3157: goto out;
3158: }
3159:
3160: /* check preamble */
3161: cp = sshbuf_ptr(blob);
3162: encoded_len = sshbuf_len(blob);
3163: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3164: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3165: r = SSH_ERR_INVALID_FORMAT;
3166: goto out;
3167: }
3168: cp += MARK_BEGIN_LEN;
3169: encoded_len -= MARK_BEGIN_LEN;
3170:
3171: /* Look for end marker, removing whitespace as we go */
3172: while (encoded_len > 0) {
3173: if (*cp != '\n' && *cp != '\r') {
3174: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3175: goto out;
3176: }
3177: last = *cp;
3178: encoded_len--;
3179: cp++;
3180: if (last == '\n') {
3181: if (encoded_len >= MARK_END_LEN &&
3182: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3183: /* \0 terminate */
3184: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3185: goto out;
3186: break;
3187: }
3188: }
3189: }
3190: if (encoded_len == 0) {
3191: r = SSH_ERR_INVALID_FORMAT;
3192: goto out;
3193: }
3194:
3195: /* decode base64 */
1.4 djm 3196: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3197: goto out;
3198:
3199: /* check magic */
3200: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3201: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3202: r = SSH_ERR_INVALID_FORMAT;
3203: goto out;
3204: }
3205: /* parse public portion of key */
3206: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3207: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3208: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3209: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3210: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3211: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3212: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3213: goto out;
3214:
3215: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3216: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3217: goto out;
3218: }
3219: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3220: strcmp(ciphername, "none") != 0) {
3221: /* passphrase required */
3222: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3223: goto out;
3224: }
3225: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3226: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3227: goto out;
3228: }
3229: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3230: r = SSH_ERR_INVALID_FORMAT;
3231: goto out;
3232: }
3233: if (nkeys != 1) {
3234: /* XXX only one key supported */
3235: r = SSH_ERR_INVALID_FORMAT;
3236: goto out;
3237: }
3238:
3239: /* check size of encrypted key blob */
3240: blocksize = cipher_blocksize(cipher);
3241: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3242: r = SSH_ERR_INVALID_FORMAT;
3243: goto out;
3244: }
3245:
3246: /* setup key */
3247: keylen = cipher_keylen(cipher);
3248: ivlen = cipher_ivlen(cipher);
1.18 djm 3249: authlen = cipher_authlen(cipher);
1.1 djm 3250: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3251: r = SSH_ERR_ALLOC_FAIL;
3252: goto out;
3253: }
3254: if (strcmp(kdfname, "bcrypt") == 0) {
3255: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3256: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3257: goto out;
3258: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3259: key, keylen + ivlen, rounds) < 0) {
3260: r = SSH_ERR_INVALID_FORMAT;
3261: goto out;
3262: }
3263: }
3264:
1.18 djm 3265: /* check that an appropriate amount of auth data is present */
3266: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3267: r = SSH_ERR_INVALID_FORMAT;
3268: goto out;
3269: }
3270:
1.1 djm 3271: /* decrypt private portion of key */
3272: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3273: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3274: key + keylen, ivlen, 0)) != 0)
3275: goto out;
1.36 djm 3276: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3277: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3278: /* an integrity error here indicates an incorrect passphrase */
3279: if (r == SSH_ERR_MAC_INVALID)
3280: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3281: goto out;
3282: }
1.18 djm 3283: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3284: goto out;
3285: /* there should be no trailing data */
3286: if (sshbuf_len(decoded) != 0) {
3287: r = SSH_ERR_INVALID_FORMAT;
3288: goto out;
3289: }
3290:
3291: /* check check bytes */
3292: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3293: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3294: goto out;
3295: if (check1 != check2) {
3296: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3297: goto out;
3298: }
3299:
3300: /* Load the private key and comment */
3301: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3302: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3303: goto out;
3304:
3305: /* Check deterministic padding */
3306: i = 0;
3307: while (sshbuf_len(decrypted)) {
3308: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3309: goto out;
3310: if (pad != (++i & 0xff)) {
3311: r = SSH_ERR_INVALID_FORMAT;
3312: goto out;
3313: }
3314: }
3315:
3316: /* XXX decode pubkey and check against private */
3317:
3318: /* success */
3319: r = 0;
3320: if (keyp != NULL) {
3321: *keyp = k;
3322: k = NULL;
3323: }
3324: if (commentp != NULL) {
3325: *commentp = comment;
3326: comment = NULL;
3327: }
3328: out:
3329: pad = 0;
1.36 djm 3330: cipher_free(ciphercontext);
1.1 djm 3331: free(ciphername);
3332: free(kdfname);
3333: free(comment);
3334: if (salt != NULL) {
3335: explicit_bzero(salt, slen);
3336: free(salt);
3337: }
3338: if (key != NULL) {
3339: explicit_bzero(key, keylen + ivlen);
3340: free(key);
3341: }
3342: sshbuf_free(encoded);
3343: sshbuf_free(decoded);
3344: sshbuf_free(kdf);
3345: sshbuf_free(decrypted);
3346: sshkey_free(k);
3347: return r;
3348: }
3349:
3350: #if WITH_SSH1
3351: /*
3352: * Serialises the authentication (private) key to a blob, encrypting it with
3353: * passphrase. The identification of the blob (lowest 64 bits of n) will
3354: * precede the key to provide identification of the key without needing a
3355: * passphrase.
3356: */
3357: static int
3358: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3359: const char *passphrase, const char *comment)
3360: {
3361: struct sshbuf *buffer = NULL, *encrypted = NULL;
3362: u_char buf[8];
3363: int r, cipher_num;
1.36 djm 3364: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3365: const struct sshcipher *cipher;
3366: u_char *cp;
3367:
3368: /*
3369: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3370: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3371: */
3372: cipher_num = (strcmp(passphrase, "") == 0) ?
3373: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3374: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3375: return SSH_ERR_INTERNAL_ERROR;
3376:
3377: /* This buffer is used to build the secret part of the private key. */
3378: if ((buffer = sshbuf_new()) == NULL)
3379: return SSH_ERR_ALLOC_FAIL;
3380:
3381: /* Put checkbytes for checking passphrase validity. */
3382: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3383: goto out;
3384: arc4random_buf(cp, 2);
3385: memcpy(cp + 2, cp, 2);
3386:
3387: /*
3388: * Store the private key (n and e will not be stored because they
3389: * will be stored in plain text, and storing them also in encrypted
3390: * format would just give known plaintext).
3391: * Note: q and p are stored in reverse order to SSL.
3392: */
3393: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3394: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3395: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3396: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3397: goto out;
3398:
3399: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3400: explicit_bzero(buf, 8);
3401: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3402: goto out;
3403:
3404: /* This buffer will be used to contain the data in the file. */
3405: if ((encrypted = sshbuf_new()) == NULL) {
3406: r = SSH_ERR_ALLOC_FAIL;
3407: goto out;
3408: }
3409:
3410: /* First store keyfile id string. */
3411: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3412: sizeof(LEGACY_BEGIN))) != 0)
3413: goto out;
3414:
3415: /* Store cipher type and "reserved" field. */
3416: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3417: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3418: goto out;
3419:
3420: /* Store public key. This will be in plain text. */
3421: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
1.22 jsg 3422: (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 ||
3423: (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 ||
3424: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
1.1 djm 3425: goto out;
3426:
3427: /* Allocate space for the private part of the key in the buffer. */
3428: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3429: goto out;
3430:
3431: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3432: CIPHER_ENCRYPT)) != 0)
3433: goto out;
1.36 djm 3434: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3435: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3436: goto out;
3437:
3438: r = sshbuf_putb(blob, encrypted);
3439:
3440: out:
1.36 djm 3441: cipher_free(ciphercontext);
1.1 djm 3442: explicit_bzero(buf, sizeof(buf));
1.31 mmcc 3443: sshbuf_free(buffer);
3444: sshbuf_free(encrypted);
1.1 djm 3445:
3446: return r;
3447: }
3448: #endif /* WITH_SSH1 */
3449:
3450: #ifdef WITH_OPENSSL
3451: /* convert SSH v2 key in OpenSSL PEM format */
3452: static int
3453: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3454: const char *_passphrase, const char *comment)
3455: {
3456: int success, r;
3457: int blen, len = strlen(_passphrase);
3458: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3459: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3460: const u_char *bptr;
3461: BIO *bio = NULL;
3462:
3463: if (len > 0 && len <= 4)
3464: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3465: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3466: return SSH_ERR_ALLOC_FAIL;
3467:
3468: switch (key->type) {
3469: case KEY_DSA:
3470: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3471: cipher, passphrase, len, NULL, NULL);
3472: break;
3473: case KEY_ECDSA:
3474: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3475: cipher, passphrase, len, NULL, NULL);
3476: break;
3477: case KEY_RSA:
3478: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3479: cipher, passphrase, len, NULL, NULL);
3480: break;
3481: default:
3482: success = 0;
3483: break;
3484: }
3485: if (success == 0) {
3486: r = SSH_ERR_LIBCRYPTO_ERROR;
3487: goto out;
3488: }
3489: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3490: r = SSH_ERR_INTERNAL_ERROR;
3491: goto out;
3492: }
3493: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3494: goto out;
3495: r = 0;
3496: out:
3497: BIO_free(bio);
3498: return r;
3499: }
3500: #endif /* WITH_OPENSSL */
3501:
3502: /* Serialise "key" to buffer "blob" */
3503: int
3504: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3505: const char *passphrase, const char *comment,
3506: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3507: {
3508: switch (key->type) {
1.9 markus 3509: #ifdef WITH_SSH1
1.1 djm 3510: case KEY_RSA1:
3511: return sshkey_private_rsa1_to_blob(key, blob,
3512: passphrase, comment);
1.9 markus 3513: #endif /* WITH_SSH1 */
3514: #ifdef WITH_OPENSSL
1.1 djm 3515: case KEY_DSA:
3516: case KEY_ECDSA:
3517: case KEY_RSA:
3518: if (force_new_format) {
3519: return sshkey_private_to_blob2(key, blob, passphrase,
3520: comment, new_format_cipher, new_format_rounds);
3521: }
3522: return sshkey_private_pem_to_blob(key, blob,
3523: passphrase, comment);
3524: #endif /* WITH_OPENSSL */
3525: case KEY_ED25519:
3526: return sshkey_private_to_blob2(key, blob, passphrase,
3527: comment, new_format_cipher, new_format_rounds);
3528: default:
3529: return SSH_ERR_KEY_TYPE_UNKNOWN;
3530: }
3531: }
3532:
3533: #ifdef WITH_SSH1
3534: /*
3535: * Parse the public, unencrypted portion of a RSA1 key.
3536: */
3537: int
3538: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3539: struct sshkey **keyp, char **commentp)
3540: {
3541: int r;
3542: struct sshkey *pub = NULL;
3543: struct sshbuf *copy = NULL;
3544:
3545: if (keyp != NULL)
3546: *keyp = NULL;
3547: if (commentp != NULL)
3548: *commentp = NULL;
3549:
3550: /* Check that it is at least big enough to contain the ID string. */
3551: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3552: return SSH_ERR_INVALID_FORMAT;
3553:
3554: /*
3555: * Make sure it begins with the id string. Consume the id string
3556: * from the buffer.
3557: */
3558: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3559: return SSH_ERR_INVALID_FORMAT;
3560: /* Make a working copy of the keyblob and skip past the magic */
3561: if ((copy = sshbuf_fromb(blob)) == NULL)
3562: return SSH_ERR_ALLOC_FAIL;
3563: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3564: goto out;
3565:
3566: /* Skip cipher type, reserved data and key bits. */
3567: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3568: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3569: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3570: goto out;
3571:
3572: /* Read the public key from the buffer. */
3573: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3574: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3575: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3576: goto out;
3577:
3578: /* Finally, the comment */
3579: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3580: goto out;
3581:
3582: /* The encrypted private part is not parsed by this function. */
3583:
3584: r = 0;
1.32 djm 3585: if (keyp != NULL) {
1.1 djm 3586: *keyp = pub;
1.32 djm 3587: pub = NULL;
3588: }
1.1 djm 3589: out:
1.31 mmcc 3590: sshbuf_free(copy);
1.30 mmcc 3591: sshkey_free(pub);
1.1 djm 3592: return r;
3593: }
3594:
3595: static int
3596: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3597: struct sshkey **keyp, char **commentp)
3598: {
3599: int r;
3600: u_int16_t check1, check2;
3601: u_int8_t cipher_type;
3602: struct sshbuf *decrypted = NULL, *copy = NULL;
3603: u_char *cp;
3604: char *comment = NULL;
1.36 djm 3605: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3606: const struct sshcipher *cipher;
3607: struct sshkey *prv = NULL;
3608:
1.32 djm 3609: if (keyp != NULL)
3610: *keyp = NULL;
1.1 djm 3611: if (commentp != NULL)
3612: *commentp = NULL;
3613:
3614: /* Check that it is at least big enough to contain the ID string. */
3615: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3616: return SSH_ERR_INVALID_FORMAT;
3617:
3618: /*
3619: * Make sure it begins with the id string. Consume the id string
3620: * from the buffer.
3621: */
3622: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3623: return SSH_ERR_INVALID_FORMAT;
3624:
3625: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3626: r = SSH_ERR_ALLOC_FAIL;
3627: goto out;
3628: }
3629: if ((copy = sshbuf_fromb(blob)) == NULL ||
3630: (decrypted = sshbuf_new()) == NULL) {
3631: r = SSH_ERR_ALLOC_FAIL;
3632: goto out;
3633: }
3634: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3635: goto out;
3636:
3637: /* Read cipher type. */
3638: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3639: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3640: goto out;
3641:
3642: /* Read the public key and comment from the buffer. */
3643: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3644: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3645: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3646: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3647: goto out;
3648:
3649: /* Check that it is a supported cipher. */
3650: cipher = cipher_by_number(cipher_type);
3651: if (cipher == NULL) {
3652: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3653: goto out;
3654: }
3655: /* Initialize space for decrypted data. */
3656: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3657: goto out;
3658:
3659: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3660: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3661: CIPHER_DECRYPT)) != 0)
3662: goto out;
1.36 djm 3663: if ((r = cipher_crypt(ciphercontext, 0, cp,
3664: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0)
1.1 djm 3665: goto out;
3666:
3667: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3668: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3669: goto out;
3670: if (check1 != check2) {
3671: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3672: goto out;
3673: }
3674:
3675: /* Read the rest of the private key. */
3676: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3677: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3678: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3679: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3680: goto out;
3681:
3682: /* calculate p-1 and q-1 */
3683: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3684: goto out;
3685:
3686: /* enable blinding */
3687: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3688: r = SSH_ERR_LIBCRYPTO_ERROR;
3689: goto out;
3690: }
3691: r = 0;
1.32 djm 3692: if (keyp != NULL) {
3693: *keyp = prv;
3694: prv = NULL;
3695: }
1.1 djm 3696: if (commentp != NULL) {
3697: *commentp = comment;
3698: comment = NULL;
3699: }
3700: out:
1.36 djm 3701: cipher_free(ciphercontext);
1.29 mmcc 3702: free(comment);
1.30 mmcc 3703: sshkey_free(prv);
1.31 mmcc 3704: sshbuf_free(copy);
3705: sshbuf_free(decrypted);
1.1 djm 3706: return r;
3707: }
3708: #endif /* WITH_SSH1 */
3709:
3710: #ifdef WITH_OPENSSL
1.8 djm 3711: static int
1.1 djm 3712: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3713: const char *passphrase, struct sshkey **keyp)
1.1 djm 3714: {
3715: EVP_PKEY *pk = NULL;
3716: struct sshkey *prv = NULL;
3717: BIO *bio = NULL;
3718: int r;
3719:
1.32 djm 3720: if (keyp != NULL)
3721: *keyp = NULL;
1.1 djm 3722:
3723: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3724: return SSH_ERR_ALLOC_FAIL;
3725: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3726: (int)sshbuf_len(blob)) {
3727: r = SSH_ERR_ALLOC_FAIL;
3728: goto out;
3729: }
3730:
3731: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3732: (char *)passphrase)) == NULL) {
1.35 djm 3733: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 3734: goto out;
3735: }
3736: if (pk->type == EVP_PKEY_RSA &&
3737: (type == KEY_UNSPEC || type == KEY_RSA)) {
3738: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3739: r = SSH_ERR_ALLOC_FAIL;
3740: goto out;
3741: }
3742: prv->rsa = EVP_PKEY_get1_RSA(pk);
3743: prv->type = KEY_RSA;
3744: #ifdef DEBUG_PK
3745: RSA_print_fp(stderr, prv->rsa, 8);
3746: #endif
3747: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3748: r = SSH_ERR_LIBCRYPTO_ERROR;
3749: goto out;
3750: }
3751: } else if (pk->type == EVP_PKEY_DSA &&
3752: (type == KEY_UNSPEC || type == KEY_DSA)) {
3753: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3754: r = SSH_ERR_ALLOC_FAIL;
3755: goto out;
3756: }
3757: prv->dsa = EVP_PKEY_get1_DSA(pk);
3758: prv->type = KEY_DSA;
3759: #ifdef DEBUG_PK
3760: DSA_print_fp(stderr, prv->dsa, 8);
3761: #endif
3762: } else if (pk->type == EVP_PKEY_EC &&
3763: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3764: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3765: r = SSH_ERR_ALLOC_FAIL;
3766: goto out;
3767: }
3768: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3769: prv->type = KEY_ECDSA;
3770: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3771: if (prv->ecdsa_nid == -1 ||
3772: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3773: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3774: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3775: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3776: r = SSH_ERR_INVALID_FORMAT;
3777: goto out;
3778: }
3779: #ifdef DEBUG_PK
3780: if (prv != NULL && prv->ecdsa != NULL)
3781: sshkey_dump_ec_key(prv->ecdsa);
3782: #endif
3783: } else {
3784: r = SSH_ERR_INVALID_FORMAT;
3785: goto out;
3786: }
3787: r = 0;
1.32 djm 3788: if (keyp != NULL) {
3789: *keyp = prv;
3790: prv = NULL;
3791: }
1.1 djm 3792: out:
3793: BIO_free(bio);
3794: if (pk != NULL)
3795: EVP_PKEY_free(pk);
1.30 mmcc 3796: sshkey_free(prv);
1.1 djm 3797: return r;
3798: }
3799: #endif /* WITH_OPENSSL */
3800:
3801: int
3802: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3803: const char *passphrase, struct sshkey **keyp, char **commentp)
3804: {
1.32 djm 3805: if (keyp != NULL)
3806: *keyp = NULL;
1.1 djm 3807: if (commentp != NULL)
3808: *commentp = NULL;
3809:
3810: switch (type) {
1.9 markus 3811: #ifdef WITH_SSH1
1.1 djm 3812: case KEY_RSA1:
3813: return sshkey_parse_private_rsa1(blob, passphrase,
3814: keyp, commentp);
1.9 markus 3815: #endif /* WITH_SSH1 */
3816: #ifdef WITH_OPENSSL
1.1 djm 3817: case KEY_DSA:
3818: case KEY_ECDSA:
3819: case KEY_RSA:
1.8 djm 3820: return sshkey_parse_private_pem_fileblob(blob, type,
3821: passphrase, keyp);
1.1 djm 3822: #endif /* WITH_OPENSSL */
3823: case KEY_ED25519:
3824: return sshkey_parse_private2(blob, type, passphrase,
3825: keyp, commentp);
3826: case KEY_UNSPEC:
1.23 tim 3827: if (sshkey_parse_private2(blob, type, passphrase, keyp,
3828: commentp) == 0)
1.1 djm 3829: return 0;
3830: #ifdef WITH_OPENSSL
1.8 djm 3831: return sshkey_parse_private_pem_fileblob(blob, type,
3832: passphrase, keyp);
1.1 djm 3833: #else
3834: return SSH_ERR_INVALID_FORMAT;
3835: #endif /* WITH_OPENSSL */
3836: default:
3837: return SSH_ERR_KEY_TYPE_UNKNOWN;
3838: }
3839: }
3840:
3841: int
3842: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3843: struct sshkey **keyp, char **commentp)
1.1 djm 3844: {
3845: if (keyp != NULL)
3846: *keyp = NULL;
3847: if (commentp != NULL)
3848: *commentp = NULL;
3849:
3850: #ifdef WITH_SSH1
3851: /* it's a SSH v1 key if the public key part is readable */
1.23 tim 3852: if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) {
1.1 djm 3853: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3854: passphrase, keyp, commentp);
3855: }
3856: #endif /* WITH_SSH1 */
1.23 tim 3857: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3858: passphrase, keyp, commentp);
1.1 djm 3859: }
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