Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.40
1.40 ! djm 1: /* $OpenBSD: sshkey.c,v 1.39 2016/09/26 21:16:11 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: break;
496: }
497:
498: if (sshkey_is_cert(k)) {
499: if ((k->cert = cert_new()) == NULL) {
500: sshkey_free(k);
501: return NULL;
502: }
503: }
504:
505: return k;
506: }
507:
508: int
509: sshkey_add_private(struct sshkey *k)
510: {
511: switch (k->type) {
512: #ifdef WITH_OPENSSL
513: case KEY_RSA1:
514: case KEY_RSA:
515: case KEY_RSA_CERT:
516: #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
517: if (bn_maybe_alloc_failed(k->rsa->d) ||
518: bn_maybe_alloc_failed(k->rsa->iqmp) ||
519: bn_maybe_alloc_failed(k->rsa->q) ||
520: bn_maybe_alloc_failed(k->rsa->p) ||
521: bn_maybe_alloc_failed(k->rsa->dmq1) ||
522: bn_maybe_alloc_failed(k->rsa->dmp1))
523: return SSH_ERR_ALLOC_FAIL;
524: break;
525: case KEY_DSA:
526: case KEY_DSA_CERT:
527: if (bn_maybe_alloc_failed(k->dsa->priv_key))
528: return SSH_ERR_ALLOC_FAIL;
529: break;
530: #undef bn_maybe_alloc_failed
531: case KEY_ECDSA:
532: case KEY_ECDSA_CERT:
533: /* Cannot do anything until we know the group */
534: break;
535: #endif /* WITH_OPENSSL */
536: case KEY_ED25519:
537: case KEY_ED25519_CERT:
538: /* no need to prealloc */
539: break;
540: case KEY_UNSPEC:
541: break;
542: default:
543: return SSH_ERR_INVALID_ARGUMENT;
544: }
545: return 0;
546: }
547:
548: struct sshkey *
549: sshkey_new_private(int type)
550: {
551: struct sshkey *k = sshkey_new(type);
552:
553: if (k == NULL)
554: return NULL;
555: if (sshkey_add_private(k) != 0) {
556: sshkey_free(k);
557: return NULL;
558: }
559: return k;
560: }
561:
562: void
563: sshkey_free(struct sshkey *k)
564: {
565: if (k == NULL)
566: return;
567: switch (k->type) {
568: #ifdef WITH_OPENSSL
569: case KEY_RSA1:
570: case KEY_RSA:
571: case KEY_RSA_CERT:
572: if (k->rsa != NULL)
573: RSA_free(k->rsa);
574: k->rsa = NULL;
575: break;
576: case KEY_DSA:
577: case KEY_DSA_CERT:
578: if (k->dsa != NULL)
579: DSA_free(k->dsa);
580: k->dsa = NULL;
581: break;
582: case KEY_ECDSA:
583: case KEY_ECDSA_CERT:
584: if (k->ecdsa != NULL)
585: EC_KEY_free(k->ecdsa);
586: k->ecdsa = NULL;
587: break;
588: #endif /* WITH_OPENSSL */
589: case KEY_ED25519:
590: case KEY_ED25519_CERT:
591: if (k->ed25519_pk) {
592: explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
593: free(k->ed25519_pk);
594: k->ed25519_pk = NULL;
595: }
596: if (k->ed25519_sk) {
597: explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
598: free(k->ed25519_sk);
599: k->ed25519_sk = NULL;
600: }
601: break;
602: case KEY_UNSPEC:
603: break;
604: default:
605: break;
606: }
607: if (sshkey_is_cert(k))
608: cert_free(k->cert);
609: explicit_bzero(k, sizeof(*k));
610: free(k);
611: }
612:
613: static int
614: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
615: {
616: if (a == NULL && b == NULL)
617: return 1;
618: if (a == NULL || b == NULL)
619: return 0;
620: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
621: return 0;
622: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
623: sshbuf_len(a->certblob)) != 0)
624: return 0;
625: return 1;
626: }
627:
628: /*
629: * Compare public portions of key only, allowing comparisons between
630: * certificates and plain keys too.
631: */
632: int
633: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
634: {
635: #ifdef WITH_OPENSSL
636: BN_CTX *bnctx;
637: #endif /* WITH_OPENSSL */
638:
639: if (a == NULL || b == NULL ||
640: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
641: return 0;
642:
643: switch (a->type) {
644: #ifdef WITH_OPENSSL
645: case KEY_RSA1:
646: case KEY_RSA_CERT:
647: case KEY_RSA:
648: return a->rsa != NULL && b->rsa != NULL &&
649: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
650: BN_cmp(a->rsa->n, b->rsa->n) == 0;
651: case KEY_DSA_CERT:
652: case KEY_DSA:
653: return a->dsa != NULL && b->dsa != NULL &&
654: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
655: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
656: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
657: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
658: case KEY_ECDSA_CERT:
659: case KEY_ECDSA:
660: if (a->ecdsa == NULL || b->ecdsa == NULL ||
661: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
662: EC_KEY_get0_public_key(b->ecdsa) == NULL)
663: return 0;
664: if ((bnctx = BN_CTX_new()) == NULL)
665: return 0;
666: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
667: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
668: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
669: EC_KEY_get0_public_key(a->ecdsa),
670: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
671: BN_CTX_free(bnctx);
672: return 0;
673: }
674: BN_CTX_free(bnctx);
675: return 1;
676: #endif /* WITH_OPENSSL */
677: case KEY_ED25519:
678: case KEY_ED25519_CERT:
679: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
680: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
681: default:
682: return 0;
683: }
684: /* NOTREACHED */
685: }
686:
687: int
688: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
689: {
690: if (a == NULL || b == NULL || a->type != b->type)
691: return 0;
692: if (sshkey_is_cert(a)) {
693: if (!cert_compare(a->cert, b->cert))
694: return 0;
695: }
696: return sshkey_equal_public(a, b);
697: }
698:
699: static int
700: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
701: {
702: int type, ret = SSH_ERR_INTERNAL_ERROR;
703: const char *typename;
704:
705: if (key == NULL)
706: return SSH_ERR_INVALID_ARGUMENT;
707:
1.19 djm 708: if (sshkey_is_cert(key)) {
709: if (key->cert == NULL)
710: return SSH_ERR_EXPECTED_CERT;
711: if (sshbuf_len(key->cert->certblob) == 0)
712: return SSH_ERR_KEY_LACKS_CERTBLOB;
713: }
1.1 djm 714: type = force_plain ? sshkey_type_plain(key->type) : key->type;
715: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
716:
717: switch (type) {
718: #ifdef WITH_OPENSSL
719: case KEY_DSA_CERT:
720: case KEY_ECDSA_CERT:
721: case KEY_RSA_CERT:
722: #endif /* WITH_OPENSSL */
723: case KEY_ED25519_CERT:
724: /* Use the existing blob */
725: /* XXX modified flag? */
726: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
727: return ret;
728: break;
729: #ifdef WITH_OPENSSL
730: case KEY_DSA:
731: if (key->dsa == NULL)
732: return SSH_ERR_INVALID_ARGUMENT;
733: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
734: (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
735: (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
736: (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
737: (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
738: return ret;
739: break;
740: case KEY_ECDSA:
741: if (key->ecdsa == NULL)
742: return SSH_ERR_INVALID_ARGUMENT;
743: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
744: (ret = sshbuf_put_cstring(b,
745: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
746: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
747: return ret;
748: break;
749: case KEY_RSA:
750: if (key->rsa == NULL)
751: return SSH_ERR_INVALID_ARGUMENT;
752: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
753: (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
754: (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
755: return ret;
756: break;
757: #endif /* WITH_OPENSSL */
758: case KEY_ED25519:
759: if (key->ed25519_pk == NULL)
760: return SSH_ERR_INVALID_ARGUMENT;
761: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
762: (ret = sshbuf_put_string(b,
763: key->ed25519_pk, ED25519_PK_SZ)) != 0)
764: return ret;
765: break;
766: default:
767: return SSH_ERR_KEY_TYPE_UNKNOWN;
768: }
769: return 0;
770: }
771:
772: int
1.14 djm 773: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 774: {
775: return to_blob_buf(key, b, 0);
776: }
777:
778: int
1.14 djm 779: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
780: {
781: struct sshbuf *tmp;
782: int r;
783:
784: if ((tmp = sshbuf_new()) == NULL)
785: return SSH_ERR_ALLOC_FAIL;
786: r = to_blob_buf(key, tmp, 0);
787: if (r == 0)
788: r = sshbuf_put_stringb(b, tmp);
789: sshbuf_free(tmp);
790: return r;
791: }
792:
793: int
794: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 795: {
796: return to_blob_buf(key, b, 1);
797: }
798:
799: static int
800: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
801: {
802: int ret = SSH_ERR_INTERNAL_ERROR;
803: size_t len;
804: struct sshbuf *b = NULL;
805:
806: if (lenp != NULL)
807: *lenp = 0;
808: if (blobp != NULL)
809: *blobp = NULL;
810: if ((b = sshbuf_new()) == NULL)
811: return SSH_ERR_ALLOC_FAIL;
812: if ((ret = to_blob_buf(key, b, force_plain)) != 0)
813: goto out;
814: len = sshbuf_len(b);
815: if (lenp != NULL)
816: *lenp = len;
817: if (blobp != NULL) {
818: if ((*blobp = malloc(len)) == NULL) {
819: ret = SSH_ERR_ALLOC_FAIL;
820: goto out;
821: }
822: memcpy(*blobp, sshbuf_ptr(b), len);
823: }
824: ret = 0;
825: out:
826: sshbuf_free(b);
827: return ret;
828: }
829:
830: int
831: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
832: {
833: return to_blob(key, blobp, lenp, 0);
834: }
835:
836: int
837: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
838: {
839: return to_blob(key, blobp, lenp, 1);
840: }
841:
842: int
1.7 djm 843: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 844: u_char **retp, size_t *lenp)
845: {
846: u_char *blob = NULL, *ret = NULL;
847: size_t blob_len = 0;
1.7 djm 848: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 849:
850: if (retp != NULL)
851: *retp = NULL;
852: if (lenp != NULL)
853: *lenp = 0;
1.7 djm 854: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 855: r = SSH_ERR_INVALID_ARGUMENT;
856: goto out;
857: }
858:
859: if (k->type == KEY_RSA1) {
860: #ifdef WITH_OPENSSL
861: int nlen = BN_num_bytes(k->rsa->n);
862: int elen = BN_num_bytes(k->rsa->e);
863:
1.39 djm 864: if (nlen < 0 || elen < 0 || nlen >= INT_MAX - elen) {
865: r = SSH_ERR_INVALID_FORMAT;
866: goto out;
867: }
1.1 djm 868: blob_len = nlen + elen;
1.39 djm 869: if ((blob = malloc(blob_len)) == NULL) {
1.1 djm 870: r = SSH_ERR_ALLOC_FAIL;
871: goto out;
872: }
873: BN_bn2bin(k->rsa->n, blob);
874: BN_bn2bin(k->rsa->e, blob + nlen);
875: #endif /* WITH_OPENSSL */
876: } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
877: goto out;
878: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
879: r = SSH_ERR_ALLOC_FAIL;
880: goto out;
881: }
1.7 djm 882: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 883: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
884: goto out;
885: /* success */
886: if (retp != NULL) {
887: *retp = ret;
888: ret = NULL;
889: }
890: if (lenp != NULL)
1.7 djm 891: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 892: r = 0;
893: out:
894: free(ret);
895: if (blob != NULL) {
896: explicit_bzero(blob, blob_len);
897: free(blob);
898: }
899: return r;
900: }
901:
902: static char *
1.7 djm 903: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
904: {
905: char *ret;
906: size_t plen = strlen(alg) + 1;
907: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
908: int r;
909:
910: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
911: return NULL;
912: strlcpy(ret, alg, rlen);
913: strlcat(ret, ":", rlen);
914: if (dgst_raw_len == 0)
915: return ret;
916: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
917: ret + plen, rlen - plen)) == -1) {
918: explicit_bzero(ret, rlen);
919: free(ret);
920: return NULL;
921: }
922: /* Trim padding characters from end */
923: ret[strcspn(ret, "=")] = '\0';
924: return ret;
925: }
926:
927: static char *
928: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 929: {
1.7 djm 930: char *retval, hex[5];
931: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 932:
1.7 djm 933: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 934: return NULL;
1.7 djm 935: strlcpy(retval, alg, rlen);
936: strlcat(retval, ":", rlen);
1.1 djm 937: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 938: snprintf(hex, sizeof(hex), "%s%02x",
939: i > 0 ? ":" : "", dgst_raw[i]);
940: strlcat(retval, hex, rlen);
1.1 djm 941: }
942: return retval;
943: }
944:
945: static char *
946: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
947: {
948: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
949: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
950: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
951: u_int i, j = 0, rounds, seed = 1;
952: char *retval;
953:
954: rounds = (dgst_raw_len / 2) + 1;
955: if ((retval = calloc(rounds, 6)) == NULL)
956: return NULL;
957: retval[j++] = 'x';
958: for (i = 0; i < rounds; i++) {
959: u_int idx0, idx1, idx2, idx3, idx4;
960: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
961: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
962: seed) % 6;
963: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
964: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
965: (seed / 6)) % 6;
966: retval[j++] = vowels[idx0];
967: retval[j++] = consonants[idx1];
968: retval[j++] = vowels[idx2];
969: if ((i + 1) < rounds) {
970: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
971: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
972: retval[j++] = consonants[idx3];
973: retval[j++] = '-';
974: retval[j++] = consonants[idx4];
975: seed = ((seed * 5) +
976: ((((u_int)(dgst_raw[2 * i])) * 7) +
977: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
978: }
979: } else {
980: idx0 = seed % 6;
981: idx1 = 16;
982: idx2 = seed / 6;
983: retval[j++] = vowels[idx0];
984: retval[j++] = consonants[idx1];
985: retval[j++] = vowels[idx2];
986: }
987: }
988: retval[j++] = 'x';
989: retval[j++] = '\0';
990: return retval;
991: }
992:
993: /*
994: * Draw an ASCII-Art representing the fingerprint so human brain can
995: * profit from its built-in pattern recognition ability.
996: * This technique is called "random art" and can be found in some
997: * scientific publications like this original paper:
998: *
999: * "Hash Visualization: a New Technique to improve Real-World Security",
1000: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1001: * Techniques and E-Commerce (CrypTEC '99)
1002: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1003: *
1004: * The subject came up in a talk by Dan Kaminsky, too.
1005: *
1006: * If you see the picture is different, the key is different.
1007: * If the picture looks the same, you still know nothing.
1008: *
1009: * The algorithm used here is a worm crawling over a discrete plane,
1010: * leaving a trace (augmenting the field) everywhere it goes.
1011: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1012: * makes the respective movement vector be ignored for this turn.
1013: * Graphs are not unambiguous, because circles in graphs can be
1014: * walked in either direction.
1015: */
1016:
1017: /*
1018: * Field sizes for the random art. Have to be odd, so the starting point
1019: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1020: * Else pictures would be too dense, and drawing the frame would
1021: * fail, too, because the key type would not fit in anymore.
1022: */
1023: #define FLDBASE 8
1024: #define FLDSIZE_Y (FLDBASE + 1)
1025: #define FLDSIZE_X (FLDBASE * 2 + 1)
1026: static char *
1.7 djm 1027: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1028: const struct sshkey *k)
1029: {
1030: /*
1031: * Chars to be used after each other every time the worm
1032: * intersects with itself. Matter of taste.
1033: */
1034: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1035: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1036: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1037: size_t i, tlen, hlen;
1.1 djm 1038: u_int b;
1.3 djm 1039: int x, y, r;
1.1 djm 1040: size_t len = strlen(augmentation_string) - 1;
1041:
1042: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1043: return NULL;
1044:
1045: /* initialize field */
1046: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1047: x = FLDSIZE_X / 2;
1048: y = FLDSIZE_Y / 2;
1049:
1050: /* process raw key */
1051: for (i = 0; i < dgst_raw_len; i++) {
1052: int input;
1053: /* each byte conveys four 2-bit move commands */
1054: input = dgst_raw[i];
1055: for (b = 0; b < 4; b++) {
1056: /* evaluate 2 bit, rest is shifted later */
1057: x += (input & 0x1) ? 1 : -1;
1058: y += (input & 0x2) ? 1 : -1;
1059:
1060: /* assure we are still in bounds */
1.37 deraadt 1061: x = MAXIMUM(x, 0);
1062: y = MAXIMUM(y, 0);
1063: x = MINIMUM(x, FLDSIZE_X - 1);
1064: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1065:
1066: /* augment the field */
1067: if (field[x][y] < len - 2)
1068: field[x][y]++;
1069: input = input >> 2;
1070: }
1071: }
1072:
1073: /* mark starting point and end point*/
1074: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1075: field[x][y] = len;
1076:
1.3 djm 1077: /* assemble title */
1078: r = snprintf(title, sizeof(title), "[%s %u]",
1079: sshkey_type(k), sshkey_size(k));
1080: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1081: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1082: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1083: tlen = (r <= 0) ? 0 : strlen(title);
1084:
1085: /* assemble hash ID. */
1086: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1087: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1088:
1089: /* output upper border */
1.3 djm 1090: p = retval;
1091: *p++ = '+';
1092: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1093: *p++ = '-';
1094: memcpy(p, title, tlen);
1095: p += tlen;
1.7 djm 1096: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1097: *p++ = '-';
1098: *p++ = '+';
1099: *p++ = '\n';
1100:
1101: /* output content */
1102: for (y = 0; y < FLDSIZE_Y; y++) {
1103: *p++ = '|';
1104: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1105: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1106: *p++ = '|';
1107: *p++ = '\n';
1108: }
1109:
1110: /* output lower border */
1111: *p++ = '+';
1.7 djm 1112: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1113: *p++ = '-';
1114: memcpy(p, hash, hlen);
1115: p += hlen;
1116: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1117: *p++ = '-';
1118: *p++ = '+';
1119:
1120: return retval;
1121: }
1122:
1123: char *
1.7 djm 1124: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1125: enum sshkey_fp_rep dgst_rep)
1126: {
1127: char *retval = NULL;
1128: u_char *dgst_raw;
1129: size_t dgst_raw_len;
1130:
1.7 djm 1131: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1132: return NULL;
1133: switch (dgst_rep) {
1.7 djm 1134: case SSH_FP_DEFAULT:
1135: if (dgst_alg == SSH_DIGEST_MD5) {
1136: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1137: dgst_raw, dgst_raw_len);
1138: } else {
1139: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1140: dgst_raw, dgst_raw_len);
1141: }
1142: break;
1.1 djm 1143: case SSH_FP_HEX:
1.7 djm 1144: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1145: dgst_raw, dgst_raw_len);
1146: break;
1147: case SSH_FP_BASE64:
1148: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1149: dgst_raw, dgst_raw_len);
1.1 djm 1150: break;
1151: case SSH_FP_BUBBLEBABBLE:
1152: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1153: break;
1154: case SSH_FP_RANDOMART:
1.7 djm 1155: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1156: dgst_raw, dgst_raw_len, k);
1.1 djm 1157: break;
1158: default:
1159: explicit_bzero(dgst_raw, dgst_raw_len);
1160: free(dgst_raw);
1161: return NULL;
1162: }
1163: explicit_bzero(dgst_raw, dgst_raw_len);
1164: free(dgst_raw);
1165: return retval;
1166: }
1167:
1168: #ifdef WITH_SSH1
1169: /*
1170: * Reads a multiple-precision integer in decimal from the buffer, and advances
1171: * the pointer. The integer must already be initialized. This function is
1172: * permitted to modify the buffer. This leaves *cpp to point just beyond the
1173: * last processed character.
1174: */
1175: static int
1176: read_decimal_bignum(char **cpp, BIGNUM *v)
1177: {
1178: char *cp;
1179: size_t e;
1180: int skip = 1; /* skip white space */
1181:
1182: cp = *cpp;
1183: while (*cp == ' ' || *cp == '\t')
1184: cp++;
1185: e = strspn(cp, "0123456789");
1186: if (e == 0)
1187: return SSH_ERR_INVALID_FORMAT;
1188: if (e > SSHBUF_MAX_BIGNUM * 3)
1189: return SSH_ERR_BIGNUM_TOO_LARGE;
1190: if (cp[e] == '\0')
1191: skip = 0;
1.26 millert 1192: else if (strchr(" \t\r\n", cp[e]) == NULL)
1.1 djm 1193: return SSH_ERR_INVALID_FORMAT;
1194: cp[e] = '\0';
1195: if (BN_dec2bn(&v, cp) <= 0)
1196: return SSH_ERR_INVALID_FORMAT;
1197: *cpp = cp + e + skip;
1198: return 0;
1199: }
1200: #endif /* WITH_SSH1 */
1201:
1202: /* returns 0 ok, and < 0 error */
1203: int
1204: sshkey_read(struct sshkey *ret, char **cpp)
1205: {
1206: struct sshkey *k;
1207: int retval = SSH_ERR_INVALID_FORMAT;
1.25 djm 1208: char *ep, *cp, *space;
1.1 djm 1209: int r, type, curve_nid = -1;
1210: struct sshbuf *blob;
1211: #ifdef WITH_SSH1
1212: u_long bits;
1213: #endif /* WITH_SSH1 */
1214:
1215: cp = *cpp;
1216:
1217: switch (ret->type) {
1218: case KEY_RSA1:
1219: #ifdef WITH_SSH1
1220: /* Get number of bits. */
1221: bits = strtoul(cp, &ep, 10);
1.26 millert 1222: if (*cp == '\0' || strchr(" \t\r\n", *ep) == NULL ||
1.1 djm 1223: bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1224: return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1225: /* Get public exponent, public modulus. */
1226: if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1227: return r;
1228: if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1229: return r;
1230: /* validate the claimed number of bits */
1231: if (BN_num_bits(ret->rsa->n) != (int)bits)
1232: return SSH_ERR_KEY_BITS_MISMATCH;
1.25 djm 1233: *cpp = ep;
1.1 djm 1234: retval = 0;
1235: #endif /* WITH_SSH1 */
1236: break;
1237: case KEY_UNSPEC:
1238: case KEY_RSA:
1239: case KEY_DSA:
1240: case KEY_ECDSA:
1241: case KEY_ED25519:
1242: case KEY_DSA_CERT:
1243: case KEY_ECDSA_CERT:
1244: case KEY_RSA_CERT:
1245: case KEY_ED25519_CERT:
1246: space = strchr(cp, ' ');
1247: if (space == NULL)
1248: return SSH_ERR_INVALID_FORMAT;
1249: *space = '\0';
1250: type = sshkey_type_from_name(cp);
1251: if (sshkey_type_plain(type) == KEY_ECDSA &&
1252: (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1253: return SSH_ERR_EC_CURVE_INVALID;
1254: *space = ' ';
1255: if (type == KEY_UNSPEC)
1256: return SSH_ERR_INVALID_FORMAT;
1257: cp = space+1;
1258: if (*cp == '\0')
1259: return SSH_ERR_INVALID_FORMAT;
1.5 djm 1260: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1261: return SSH_ERR_KEY_TYPE_MISMATCH;
1262: if ((blob = sshbuf_new()) == NULL)
1263: return SSH_ERR_ALLOC_FAIL;
1264: /* trim comment */
1265: space = strchr(cp, ' ');
1.10 markus 1266: if (space) {
1267: /* advance 'space': skip whitespace */
1268: *space++ = '\0';
1269: while (*space == ' ' || *space == '\t')
1270: space++;
1.25 djm 1271: ep = space;
1.10 markus 1272: } else
1.25 djm 1273: ep = cp + strlen(cp);
1.1 djm 1274: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1275: sshbuf_free(blob);
1276: return r;
1277: }
1278: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1279: sshbuf_len(blob), &k)) != 0) {
1280: sshbuf_free(blob);
1281: return r;
1282: }
1283: sshbuf_free(blob);
1284: if (k->type != type) {
1285: sshkey_free(k);
1286: return SSH_ERR_KEY_TYPE_MISMATCH;
1287: }
1288: if (sshkey_type_plain(type) == KEY_ECDSA &&
1289: curve_nid != k->ecdsa_nid) {
1290: sshkey_free(k);
1291: return SSH_ERR_EC_CURVE_MISMATCH;
1292: }
1.5 djm 1293: ret->type = type;
1.1 djm 1294: if (sshkey_is_cert(ret)) {
1295: if (!sshkey_is_cert(k)) {
1296: sshkey_free(k);
1297: return SSH_ERR_EXPECTED_CERT;
1298: }
1299: if (ret->cert != NULL)
1300: cert_free(ret->cert);
1301: ret->cert = k->cert;
1302: k->cert = NULL;
1303: }
1.25 djm 1304: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1305: #ifdef WITH_OPENSSL
1.25 djm 1306: case KEY_RSA:
1.1 djm 1307: if (ret->rsa != NULL)
1308: RSA_free(ret->rsa);
1309: ret->rsa = k->rsa;
1310: k->rsa = NULL;
1311: #ifdef DEBUG_PK
1312: RSA_print_fp(stderr, ret->rsa, 8);
1313: #endif
1.25 djm 1314: break;
1315: case KEY_DSA:
1.1 djm 1316: if (ret->dsa != NULL)
1317: DSA_free(ret->dsa);
1318: ret->dsa = k->dsa;
1319: k->dsa = NULL;
1320: #ifdef DEBUG_PK
1321: DSA_print_fp(stderr, ret->dsa, 8);
1322: #endif
1.25 djm 1323: break;
1324: case KEY_ECDSA:
1.1 djm 1325: if (ret->ecdsa != NULL)
1326: EC_KEY_free(ret->ecdsa);
1327: ret->ecdsa = k->ecdsa;
1328: ret->ecdsa_nid = k->ecdsa_nid;
1329: k->ecdsa = NULL;
1330: k->ecdsa_nid = -1;
1331: #ifdef DEBUG_PK
1332: sshkey_dump_ec_key(ret->ecdsa);
1333: #endif
1.25 djm 1334: break;
1.1 djm 1335: #endif /* WITH_OPENSSL */
1.25 djm 1336: case KEY_ED25519:
1.1 djm 1337: free(ret->ed25519_pk);
1338: ret->ed25519_pk = k->ed25519_pk;
1339: k->ed25519_pk = NULL;
1340: #ifdef DEBUG_PK
1341: /* XXX */
1342: #endif
1.25 djm 1343: break;
1.1 djm 1344: }
1.25 djm 1345: *cpp = ep;
1.1 djm 1346: retval = 0;
1347: /*XXXX*/
1348: sshkey_free(k);
1349: if (retval != 0)
1350: break;
1351: break;
1352: default:
1353: return SSH_ERR_INVALID_ARGUMENT;
1354: }
1355: return retval;
1356: }
1357:
1358: int
1.19 djm 1359: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1360: {
1.19 djm 1361: int r = SSH_ERR_INTERNAL_ERROR;
1362: struct sshbuf *b = NULL;
1.1 djm 1363: char *uu = NULL;
1.19 djm 1364:
1365: if (b64p != NULL)
1366: *b64p = NULL;
1367: if ((b = sshbuf_new()) == NULL)
1368: return SSH_ERR_ALLOC_FAIL;
1369: if ((r = sshkey_putb(key, b)) != 0)
1370: goto out;
1371: if ((uu = sshbuf_dtob64(b)) == NULL) {
1372: r = SSH_ERR_ALLOC_FAIL;
1373: goto out;
1374: }
1375: /* Success */
1376: if (b64p != NULL) {
1377: *b64p = uu;
1378: uu = NULL;
1379: }
1380: r = 0;
1381: out:
1382: sshbuf_free(b);
1383: free(uu);
1384: return r;
1385: }
1386:
1387: static int
1388: sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
1389: {
1390: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1391: #ifdef WITH_SSH1
1392: u_int bits = 0;
1393: char *dec_e = NULL, *dec_n = NULL;
1394:
1.19 djm 1395: if (key->rsa == NULL || key->rsa->e == NULL ||
1396: key->rsa->n == NULL) {
1397: r = SSH_ERR_INVALID_ARGUMENT;
1398: goto out;
1399: }
1400: if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1401: (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1402: r = SSH_ERR_ALLOC_FAIL;
1403: goto out;
1404: }
1405: /* size of modulus 'n' */
1406: if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1407: r = SSH_ERR_INVALID_ARGUMENT;
1408: goto out;
1.1 djm 1409: }
1.19 djm 1410: if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1411: goto out;
1412:
1413: /* Success */
1414: r = 0;
1415: out:
1416: if (dec_e != NULL)
1417: OPENSSL_free(dec_e);
1418: if (dec_n != NULL)
1419: OPENSSL_free(dec_n);
1.1 djm 1420: #endif /* WITH_SSH1 */
1.19 djm 1421:
1422: return r;
1423: }
1424:
1425: static int
1426: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1427: {
1428: int r = SSH_ERR_INTERNAL_ERROR;
1429: char *uu = NULL;
1430:
1431: if (key->type == KEY_RSA1) {
1432: if ((r = sshkey_format_rsa1(key, b)) != 0)
1.1 djm 1433: goto out;
1.19 djm 1434: } else {
1435: /* Unsupported key types handled in sshkey_to_base64() */
1436: if ((r = sshkey_to_base64(key, &uu)) != 0)
1.1 djm 1437: goto out;
1.19 djm 1438: if ((r = sshbuf_putf(b, "%s %s",
1439: sshkey_ssh_name(key), uu)) != 0)
1.1 djm 1440: goto out;
1.19 djm 1441: }
1442: r = 0;
1443: out:
1444: free(uu);
1445: return r;
1446: }
1447:
1448: int
1449: sshkey_write(const struct sshkey *key, FILE *f)
1450: {
1451: struct sshbuf *b = NULL;
1452: int r = SSH_ERR_INTERNAL_ERROR;
1453:
1454: if ((b = sshbuf_new()) == NULL)
1455: return SSH_ERR_ALLOC_FAIL;
1456: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1457: goto out;
1458: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1459: if (feof(f))
1460: errno = EPIPE;
1.19 djm 1461: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1462: goto out;
1463: }
1.19 djm 1464: /* Success */
1465: r = 0;
1.1 djm 1466: out:
1.19 djm 1467: sshbuf_free(b);
1468: return r;
1.1 djm 1469: }
1470:
1471: const char *
1472: sshkey_cert_type(const struct sshkey *k)
1473: {
1474: switch (k->cert->type) {
1475: case SSH2_CERT_TYPE_USER:
1476: return "user";
1477: case SSH2_CERT_TYPE_HOST:
1478: return "host";
1479: default:
1480: return "unknown";
1481: }
1482: }
1483:
1484: #ifdef WITH_OPENSSL
1485: static int
1486: rsa_generate_private_key(u_int bits, RSA **rsap)
1487: {
1488: RSA *private = NULL;
1489: BIGNUM *f4 = NULL;
1490: int ret = SSH_ERR_INTERNAL_ERROR;
1491:
1492: if (rsap == NULL ||
1493: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1494: bits > SSHBUF_MAX_BIGNUM * 8)
1495: return SSH_ERR_INVALID_ARGUMENT;
1496: *rsap = NULL;
1497: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1498: ret = SSH_ERR_ALLOC_FAIL;
1499: goto out;
1500: }
1501: if (!BN_set_word(f4, RSA_F4) ||
1502: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1503: ret = SSH_ERR_LIBCRYPTO_ERROR;
1504: goto out;
1505: }
1506: *rsap = private;
1507: private = NULL;
1508: ret = 0;
1509: out:
1510: if (private != NULL)
1511: RSA_free(private);
1512: if (f4 != NULL)
1513: BN_free(f4);
1514: return ret;
1515: }
1516:
1517: static int
1518: dsa_generate_private_key(u_int bits, DSA **dsap)
1519: {
1520: DSA *private;
1521: int ret = SSH_ERR_INTERNAL_ERROR;
1522:
1523: if (dsap == NULL || bits != 1024)
1524: return SSH_ERR_INVALID_ARGUMENT;
1525: if ((private = DSA_new()) == NULL) {
1526: ret = SSH_ERR_ALLOC_FAIL;
1527: goto out;
1528: }
1529: *dsap = NULL;
1530: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1531: NULL, NULL) || !DSA_generate_key(private)) {
1532: ret = SSH_ERR_LIBCRYPTO_ERROR;
1533: goto out;
1534: }
1535: *dsap = private;
1536: private = NULL;
1537: ret = 0;
1538: out:
1539: if (private != NULL)
1540: DSA_free(private);
1541: return ret;
1542: }
1543:
1544: int
1545: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1546: {
1547: EC_GROUP *eg;
1548: int nids[] = {
1549: NID_X9_62_prime256v1,
1550: NID_secp384r1,
1551: NID_secp521r1,
1552: -1
1553: };
1554: int nid;
1555: u_int i;
1556: BN_CTX *bnctx;
1557: const EC_GROUP *g = EC_KEY_get0_group(k);
1558:
1559: /*
1560: * The group may be stored in a ASN.1 encoded private key in one of two
1561: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1562: * or explicit group parameters encoded into the key blob. Only the
1563: * "named group" case sets the group NID for us, but we can figure
1564: * it out for the other case by comparing against all the groups that
1565: * are supported.
1566: */
1567: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1568: return nid;
1569: if ((bnctx = BN_CTX_new()) == NULL)
1570: return -1;
1571: for (i = 0; nids[i] != -1; i++) {
1572: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1573: BN_CTX_free(bnctx);
1574: return -1;
1575: }
1576: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1577: break;
1578: EC_GROUP_free(eg);
1579: }
1580: BN_CTX_free(bnctx);
1581: if (nids[i] != -1) {
1582: /* Use the group with the NID attached */
1583: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1584: if (EC_KEY_set_group(k, eg) != 1) {
1585: EC_GROUP_free(eg);
1586: return -1;
1587: }
1588: }
1589: return nids[i];
1590: }
1591:
1592: static int
1593: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1594: {
1595: EC_KEY *private;
1596: int ret = SSH_ERR_INTERNAL_ERROR;
1597:
1598: if (nid == NULL || ecdsap == NULL ||
1599: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1600: return SSH_ERR_INVALID_ARGUMENT;
1601: *ecdsap = NULL;
1602: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1603: ret = SSH_ERR_ALLOC_FAIL;
1604: goto out;
1605: }
1606: if (EC_KEY_generate_key(private) != 1) {
1607: ret = SSH_ERR_LIBCRYPTO_ERROR;
1608: goto out;
1609: }
1610: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1611: *ecdsap = private;
1612: private = NULL;
1613: ret = 0;
1614: out:
1615: if (private != NULL)
1616: EC_KEY_free(private);
1617: return ret;
1618: }
1619: #endif /* WITH_OPENSSL */
1620:
1621: int
1622: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1623: {
1624: struct sshkey *k;
1625: int ret = SSH_ERR_INTERNAL_ERROR;
1626:
1627: if (keyp == NULL)
1628: return SSH_ERR_INVALID_ARGUMENT;
1629: *keyp = NULL;
1630: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1631: return SSH_ERR_ALLOC_FAIL;
1632: switch (type) {
1633: case KEY_ED25519:
1634: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1635: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1636: ret = SSH_ERR_ALLOC_FAIL;
1637: break;
1638: }
1639: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1640: ret = 0;
1641: break;
1642: #ifdef WITH_OPENSSL
1643: case KEY_DSA:
1644: ret = dsa_generate_private_key(bits, &k->dsa);
1645: break;
1646: case KEY_ECDSA:
1647: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1648: &k->ecdsa);
1649: break;
1650: case KEY_RSA:
1651: case KEY_RSA1:
1652: ret = rsa_generate_private_key(bits, &k->rsa);
1653: break;
1654: #endif /* WITH_OPENSSL */
1655: default:
1656: ret = SSH_ERR_INVALID_ARGUMENT;
1657: }
1658: if (ret == 0) {
1659: k->type = type;
1660: *keyp = k;
1661: } else
1662: sshkey_free(k);
1663: return ret;
1664: }
1665:
1666: int
1667: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1668: {
1669: u_int i;
1670: const struct sshkey_cert *from;
1671: struct sshkey_cert *to;
1672: int ret = SSH_ERR_INTERNAL_ERROR;
1673:
1674: if (to_key->cert != NULL) {
1675: cert_free(to_key->cert);
1676: to_key->cert = NULL;
1677: }
1678:
1679: if ((from = from_key->cert) == NULL)
1680: return SSH_ERR_INVALID_ARGUMENT;
1681:
1682: if ((to = to_key->cert = cert_new()) == NULL)
1683: return SSH_ERR_ALLOC_FAIL;
1684:
1685: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1686: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1.22 jsg 1687: (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1.1 djm 1688: return ret;
1689:
1690: to->serial = from->serial;
1691: to->type = from->type;
1692: if (from->key_id == NULL)
1693: to->key_id = NULL;
1694: else if ((to->key_id = strdup(from->key_id)) == NULL)
1695: return SSH_ERR_ALLOC_FAIL;
1696: to->valid_after = from->valid_after;
1697: to->valid_before = from->valid_before;
1698: if (from->signature_key == NULL)
1699: to->signature_key = NULL;
1700: else if ((ret = sshkey_from_private(from->signature_key,
1701: &to->signature_key)) != 0)
1702: return ret;
1703:
1704: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1705: return SSH_ERR_INVALID_ARGUMENT;
1706: if (from->nprincipals > 0) {
1707: if ((to->principals = calloc(from->nprincipals,
1708: sizeof(*to->principals))) == NULL)
1709: return SSH_ERR_ALLOC_FAIL;
1710: for (i = 0; i < from->nprincipals; i++) {
1711: to->principals[i] = strdup(from->principals[i]);
1712: if (to->principals[i] == NULL) {
1713: to->nprincipals = i;
1714: return SSH_ERR_ALLOC_FAIL;
1715: }
1716: }
1717: }
1718: to->nprincipals = from->nprincipals;
1719: return 0;
1720: }
1721:
1722: int
1723: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1724: {
1725: struct sshkey *n = NULL;
1726: int ret = SSH_ERR_INTERNAL_ERROR;
1727:
1.24 djm 1728: *pkp = NULL;
1.1 djm 1729: switch (k->type) {
1730: #ifdef WITH_OPENSSL
1731: case KEY_DSA:
1732: case KEY_DSA_CERT:
1733: if ((n = sshkey_new(k->type)) == NULL)
1734: return SSH_ERR_ALLOC_FAIL;
1735: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1736: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1737: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1738: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1739: sshkey_free(n);
1740: return SSH_ERR_ALLOC_FAIL;
1741: }
1742: break;
1743: case KEY_ECDSA:
1744: case KEY_ECDSA_CERT:
1745: if ((n = sshkey_new(k->type)) == NULL)
1746: return SSH_ERR_ALLOC_FAIL;
1747: n->ecdsa_nid = k->ecdsa_nid;
1748: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1749: if (n->ecdsa == NULL) {
1750: sshkey_free(n);
1751: return SSH_ERR_ALLOC_FAIL;
1752: }
1753: if (EC_KEY_set_public_key(n->ecdsa,
1754: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1755: sshkey_free(n);
1756: return SSH_ERR_LIBCRYPTO_ERROR;
1757: }
1758: break;
1759: case KEY_RSA:
1760: case KEY_RSA1:
1761: case KEY_RSA_CERT:
1762: if ((n = sshkey_new(k->type)) == NULL)
1763: return SSH_ERR_ALLOC_FAIL;
1764: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1765: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1766: sshkey_free(n);
1767: return SSH_ERR_ALLOC_FAIL;
1768: }
1769: break;
1770: #endif /* WITH_OPENSSL */
1771: case KEY_ED25519:
1772: case KEY_ED25519_CERT:
1773: if ((n = sshkey_new(k->type)) == NULL)
1774: return SSH_ERR_ALLOC_FAIL;
1775: if (k->ed25519_pk != NULL) {
1776: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1777: sshkey_free(n);
1778: return SSH_ERR_ALLOC_FAIL;
1779: }
1780: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1781: }
1782: break;
1783: default:
1784: return SSH_ERR_KEY_TYPE_UNKNOWN;
1785: }
1786: if (sshkey_is_cert(k)) {
1787: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1788: sshkey_free(n);
1789: return ret;
1790: }
1791: }
1792: *pkp = n;
1793: return 0;
1794: }
1795:
1796: static int
1.14 djm 1797: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1798: {
1.14 djm 1799: struct sshbuf *principals = NULL, *crit = NULL;
1800: struct sshbuf *exts = NULL, *ca = NULL;
1801: u_char *sig = NULL;
1802: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1803: int ret = SSH_ERR_INTERNAL_ERROR;
1804:
1805: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1806: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1807: return ret;
1808:
1.20 djm 1809: /* Parse body of certificate up to signature */
1810: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1811: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1812: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1813: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1814: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1815: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1816: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1817: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1818: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1819: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1820: /* XXX debug print error for ret */
1821: ret = SSH_ERR_INVALID_FORMAT;
1822: goto out;
1823: }
1824:
1825: /* Signature is left in the buffer so we can calculate this length */
1826: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1827:
1828: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1829: ret = SSH_ERR_INVALID_FORMAT;
1830: goto out;
1831: }
1832:
1833: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1834: key->cert->type != SSH2_CERT_TYPE_HOST) {
1835: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1836: goto out;
1837: }
1838:
1.4 djm 1839: /* Parse principals section */
1840: while (sshbuf_len(principals) > 0) {
1841: char *principal = NULL;
1842: char **oprincipals = NULL;
1843:
1.1 djm 1844: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1845: ret = SSH_ERR_INVALID_FORMAT;
1846: goto out;
1847: }
1.4 djm 1848: if ((ret = sshbuf_get_cstring(principals, &principal,
1849: NULL)) != 0) {
1.1 djm 1850: ret = SSH_ERR_INVALID_FORMAT;
1851: goto out;
1852: }
1853: oprincipals = key->cert->principals;
1.20 djm 1854: key->cert->principals = reallocarray(key->cert->principals,
1855: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1.1 djm 1856: if (key->cert->principals == NULL) {
1857: free(principal);
1858: key->cert->principals = oprincipals;
1859: ret = SSH_ERR_ALLOC_FAIL;
1860: goto out;
1861: }
1862: key->cert->principals[key->cert->nprincipals++] = principal;
1863: }
1864:
1.4 djm 1865: /*
1866: * Stash a copies of the critical options and extensions sections
1867: * for later use.
1868: */
1869: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1870: (exts != NULL &&
1871: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1872: goto out;
1873:
1.4 djm 1874: /*
1875: * Validate critical options and extensions sections format.
1876: */
1877: while (sshbuf_len(crit) != 0) {
1878: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1879: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1880: sshbuf_reset(key->cert->critical);
1.1 djm 1881: ret = SSH_ERR_INVALID_FORMAT;
1882: goto out;
1883: }
1884: }
1.4 djm 1885: while (exts != NULL && sshbuf_len(exts) != 0) {
1886: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1887: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1888: sshbuf_reset(key->cert->extensions);
1.1 djm 1889: ret = SSH_ERR_INVALID_FORMAT;
1890: goto out;
1891: }
1892: }
1893:
1.4 djm 1894: /* Parse CA key and check signature */
1.14 djm 1895: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1896: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1897: goto out;
1898: }
1899: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1900: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1901: goto out;
1902: }
1903: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1904: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1905: goto out;
1.4 djm 1906:
1907: /* Success */
1.1 djm 1908: ret = 0;
1909: out:
1.14 djm 1910: sshbuf_free(ca);
1.4 djm 1911: sshbuf_free(crit);
1912: sshbuf_free(exts);
1913: sshbuf_free(principals);
1.1 djm 1914: free(sig);
1915: return ret;
1916: }
1917:
1918: static int
1.14 djm 1919: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1920: int allow_cert)
1.1 djm 1921: {
1.12 djm 1922: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1923: char *ktype = NULL, *curve = NULL;
1924: struct sshkey *key = NULL;
1925: size_t len;
1926: u_char *pk = NULL;
1.14 djm 1927: struct sshbuf *copy;
1.1 djm 1928: #ifdef WITH_OPENSSL
1929: EC_POINT *q = NULL;
1930: #endif /* WITH_OPENSSL */
1931:
1932: #ifdef DEBUG_PK /* XXX */
1.14 djm 1933: sshbuf_dump(b, stderr);
1.1 djm 1934: #endif
1.32 djm 1935: if (keyp != NULL)
1936: *keyp = NULL;
1.14 djm 1937: if ((copy = sshbuf_fromb(b)) == NULL) {
1938: ret = SSH_ERR_ALLOC_FAIL;
1939: goto out;
1940: }
1.1 djm 1941: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1942: ret = SSH_ERR_INVALID_FORMAT;
1943: goto out;
1944: }
1945:
1946: type = sshkey_type_from_name(ktype);
1947: if (!allow_cert && sshkey_type_is_cert(type)) {
1948: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1949: goto out;
1950: }
1951: switch (type) {
1952: #ifdef WITH_OPENSSL
1953: case KEY_RSA_CERT:
1.14 djm 1954: /* Skip nonce */
1.1 djm 1955: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1956: ret = SSH_ERR_INVALID_FORMAT;
1957: goto out;
1958: }
1959: /* FALLTHROUGH */
1960: case KEY_RSA:
1961: if ((key = sshkey_new(type)) == NULL) {
1962: ret = SSH_ERR_ALLOC_FAIL;
1963: goto out;
1964: }
1.16 djm 1965: if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
1966: sshbuf_get_bignum2(b, key->rsa->n) != 0) {
1.1 djm 1967: ret = SSH_ERR_INVALID_FORMAT;
1968: goto out;
1969: }
1970: #ifdef DEBUG_PK
1971: RSA_print_fp(stderr, key->rsa, 8);
1972: #endif
1973: break;
1974: case KEY_DSA_CERT:
1.14 djm 1975: /* Skip nonce */
1.1 djm 1976: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1977: ret = SSH_ERR_INVALID_FORMAT;
1978: goto out;
1979: }
1980: /* FALLTHROUGH */
1981: case KEY_DSA:
1982: if ((key = sshkey_new(type)) == NULL) {
1983: ret = SSH_ERR_ALLOC_FAIL;
1984: goto out;
1985: }
1.16 djm 1986: if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
1987: sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
1988: sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
1989: sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
1.1 djm 1990: ret = SSH_ERR_INVALID_FORMAT;
1991: goto out;
1992: }
1993: #ifdef DEBUG_PK
1994: DSA_print_fp(stderr, key->dsa, 8);
1995: #endif
1996: break;
1997: case KEY_ECDSA_CERT:
1.14 djm 1998: /* Skip nonce */
1.1 djm 1999: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2000: ret = SSH_ERR_INVALID_FORMAT;
2001: goto out;
2002: }
2003: /* FALLTHROUGH */
2004: case KEY_ECDSA:
2005: if ((key = sshkey_new(type)) == NULL) {
2006: ret = SSH_ERR_ALLOC_FAIL;
2007: goto out;
2008: }
1.12 djm 2009: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2010: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2011: ret = SSH_ERR_INVALID_FORMAT;
2012: goto out;
2013: }
2014: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2015: ret = SSH_ERR_EC_CURVE_MISMATCH;
2016: goto out;
2017: }
2018: if (key->ecdsa != NULL)
2019: EC_KEY_free(key->ecdsa);
2020: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2021: == NULL) {
2022: ret = SSH_ERR_EC_CURVE_INVALID;
2023: goto out;
2024: }
2025: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2026: ret = SSH_ERR_ALLOC_FAIL;
2027: goto out;
2028: }
2029: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2030: ret = SSH_ERR_INVALID_FORMAT;
2031: goto out;
2032: }
2033: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2034: q) != 0) {
2035: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2036: goto out;
2037: }
2038: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2039: /* XXX assume it is a allocation error */
2040: ret = SSH_ERR_ALLOC_FAIL;
2041: goto out;
2042: }
2043: #ifdef DEBUG_PK
2044: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2045: #endif
2046: break;
2047: #endif /* WITH_OPENSSL */
2048: case KEY_ED25519_CERT:
1.14 djm 2049: /* Skip nonce */
1.1 djm 2050: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2051: ret = SSH_ERR_INVALID_FORMAT;
2052: goto out;
2053: }
2054: /* FALLTHROUGH */
2055: case KEY_ED25519:
2056: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2057: goto out;
2058: if (len != ED25519_PK_SZ) {
2059: ret = SSH_ERR_INVALID_FORMAT;
2060: goto out;
2061: }
2062: if ((key = sshkey_new(type)) == NULL) {
2063: ret = SSH_ERR_ALLOC_FAIL;
2064: goto out;
2065: }
2066: key->ed25519_pk = pk;
2067: pk = NULL;
2068: break;
2069: case KEY_UNSPEC:
2070: if ((key = sshkey_new(type)) == NULL) {
2071: ret = SSH_ERR_ALLOC_FAIL;
2072: goto out;
2073: }
2074: break;
2075: default:
2076: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2077: goto out;
2078: }
2079:
2080: /* Parse certificate potion */
1.14 djm 2081: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2082: goto out;
2083:
2084: if (key != NULL && sshbuf_len(b) != 0) {
2085: ret = SSH_ERR_INVALID_FORMAT;
2086: goto out;
2087: }
2088: ret = 0;
1.32 djm 2089: if (keyp != NULL) {
2090: *keyp = key;
2091: key = NULL;
2092: }
1.1 djm 2093: out:
1.14 djm 2094: sshbuf_free(copy);
1.1 djm 2095: sshkey_free(key);
2096: free(ktype);
2097: free(curve);
2098: free(pk);
2099: #ifdef WITH_OPENSSL
2100: if (q != NULL)
2101: EC_POINT_free(q);
2102: #endif /* WITH_OPENSSL */
2103: return ret;
2104: }
2105:
2106: int
2107: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2108: {
1.14 djm 2109: struct sshbuf *b;
2110: int r;
2111:
2112: if ((b = sshbuf_from(blob, blen)) == NULL)
2113: return SSH_ERR_ALLOC_FAIL;
2114: r = sshkey_from_blob_internal(b, keyp, 1);
2115: sshbuf_free(b);
2116: return r;
2117: }
2118:
2119: int
2120: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2121: {
2122: return sshkey_from_blob_internal(b, keyp, 1);
2123: }
2124:
2125: int
2126: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2127: {
2128: struct sshbuf *b;
2129: int r;
2130:
2131: if ((r = sshbuf_froms(buf, &b)) != 0)
2132: return r;
2133: r = sshkey_from_blob_internal(b, keyp, 1);
2134: sshbuf_free(b);
2135: return r;
1.1 djm 2136: }
2137:
2138: int
2139: sshkey_sign(const struct sshkey *key,
2140: u_char **sigp, size_t *lenp,
1.28 markus 2141: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2142: {
2143: if (sigp != NULL)
2144: *sigp = NULL;
2145: if (lenp != NULL)
2146: *lenp = 0;
2147: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2148: return SSH_ERR_INVALID_ARGUMENT;
2149: switch (key->type) {
2150: #ifdef WITH_OPENSSL
2151: case KEY_DSA_CERT:
2152: case KEY_DSA:
2153: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2154: case KEY_ECDSA_CERT:
2155: case KEY_ECDSA:
2156: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2157: case KEY_RSA_CERT:
2158: case KEY_RSA:
1.28 markus 2159: return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
1.1 djm 2160: #endif /* WITH_OPENSSL */
2161: case KEY_ED25519:
2162: case KEY_ED25519_CERT:
2163: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2164: default:
2165: return SSH_ERR_KEY_TYPE_UNKNOWN;
2166: }
2167: }
2168:
2169: /*
2170: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2171: */
2172: int
2173: sshkey_verify(const struct sshkey *key,
2174: const u_char *sig, size_t siglen,
2175: const u_char *data, size_t dlen, u_int compat)
2176: {
1.6 djm 2177: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2178: return SSH_ERR_INVALID_ARGUMENT;
2179: switch (key->type) {
2180: #ifdef WITH_OPENSSL
2181: case KEY_DSA_CERT:
2182: case KEY_DSA:
2183: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2184: case KEY_ECDSA_CERT:
2185: case KEY_ECDSA:
2186: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2187: case KEY_RSA_CERT:
2188: case KEY_RSA:
1.28 markus 2189: return ssh_rsa_verify(key, sig, siglen, data, dlen);
1.1 djm 2190: #endif /* WITH_OPENSSL */
2191: case KEY_ED25519:
2192: case KEY_ED25519_CERT:
2193: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2194: default:
2195: return SSH_ERR_KEY_TYPE_UNKNOWN;
2196: }
2197: }
2198:
2199: /* Converts a private to a public key */
2200: int
2201: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2202: {
2203: struct sshkey *pk;
2204: int ret = SSH_ERR_INTERNAL_ERROR;
2205:
1.24 djm 2206: *dkp = NULL;
1.1 djm 2207: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2208: return SSH_ERR_ALLOC_FAIL;
2209: pk->type = k->type;
2210: pk->flags = k->flags;
2211: pk->ecdsa_nid = k->ecdsa_nid;
2212: pk->dsa = NULL;
2213: pk->ecdsa = NULL;
2214: pk->rsa = NULL;
2215: pk->ed25519_pk = NULL;
2216: pk->ed25519_sk = NULL;
2217:
2218: switch (k->type) {
2219: #ifdef WITH_OPENSSL
2220: case KEY_RSA_CERT:
2221: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2222: goto fail;
2223: /* FALLTHROUGH */
2224: case KEY_RSA1:
2225: case KEY_RSA:
2226: if ((pk->rsa = RSA_new()) == NULL ||
2227: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2228: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2229: ret = SSH_ERR_ALLOC_FAIL;
2230: goto fail;
2231: }
2232: break;
2233: case KEY_DSA_CERT:
2234: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2235: goto fail;
2236: /* FALLTHROUGH */
2237: case KEY_DSA:
2238: if ((pk->dsa = DSA_new()) == NULL ||
2239: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2240: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2241: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2242: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2243: ret = SSH_ERR_ALLOC_FAIL;
2244: goto fail;
2245: }
2246: break;
2247: case KEY_ECDSA_CERT:
2248: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2249: goto fail;
2250: /* FALLTHROUGH */
2251: case KEY_ECDSA:
2252: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2253: if (pk->ecdsa == NULL) {
2254: ret = SSH_ERR_ALLOC_FAIL;
2255: goto fail;
2256: }
2257: if (EC_KEY_set_public_key(pk->ecdsa,
2258: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2259: ret = SSH_ERR_LIBCRYPTO_ERROR;
2260: goto fail;
2261: }
2262: break;
2263: #endif /* WITH_OPENSSL */
2264: case KEY_ED25519_CERT:
2265: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2266: goto fail;
2267: /* FALLTHROUGH */
2268: case KEY_ED25519:
2269: if (k->ed25519_pk != NULL) {
2270: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2271: ret = SSH_ERR_ALLOC_FAIL;
2272: goto fail;
2273: }
2274: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2275: }
2276: break;
2277: default:
2278: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2279: fail:
2280: sshkey_free(pk);
2281: return ret;
2282: }
2283: *dkp = pk;
2284: return 0;
2285: }
2286:
2287: /* Convert a plain key to their _CERT equivalent */
2288: int
1.20 djm 2289: sshkey_to_certified(struct sshkey *k)
1.1 djm 2290: {
2291: int newtype;
2292:
2293: switch (k->type) {
2294: #ifdef WITH_OPENSSL
2295: case KEY_RSA:
1.20 djm 2296: newtype = KEY_RSA_CERT;
1.1 djm 2297: break;
2298: case KEY_DSA:
1.20 djm 2299: newtype = KEY_DSA_CERT;
1.1 djm 2300: break;
2301: case KEY_ECDSA:
2302: newtype = KEY_ECDSA_CERT;
2303: break;
2304: #endif /* WITH_OPENSSL */
2305: case KEY_ED25519:
2306: newtype = KEY_ED25519_CERT;
2307: break;
2308: default:
2309: return SSH_ERR_INVALID_ARGUMENT;
2310: }
2311: if ((k->cert = cert_new()) == NULL)
2312: return SSH_ERR_ALLOC_FAIL;
2313: k->type = newtype;
2314: return 0;
2315: }
2316:
2317: /* Convert a certificate to its raw key equivalent */
2318: int
2319: sshkey_drop_cert(struct sshkey *k)
2320: {
2321: if (!sshkey_type_is_cert(k->type))
2322: return SSH_ERR_KEY_TYPE_UNKNOWN;
2323: cert_free(k->cert);
2324: k->cert = NULL;
2325: k->type = sshkey_type_plain(k->type);
2326: return 0;
2327: }
2328:
2329: /* Sign a certified key, (re-)generating the signed certblob. */
2330: int
1.33 djm 2331: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
1.1 djm 2332: {
2333: struct sshbuf *principals = NULL;
2334: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2335: size_t i, ca_len, sig_len;
2336: int ret = SSH_ERR_INTERNAL_ERROR;
2337: struct sshbuf *cert;
2338:
2339: if (k == NULL || k->cert == NULL ||
2340: k->cert->certblob == NULL || ca == NULL)
2341: return SSH_ERR_INVALID_ARGUMENT;
2342: if (!sshkey_is_cert(k))
2343: return SSH_ERR_KEY_TYPE_UNKNOWN;
2344: if (!sshkey_type_is_valid_ca(ca->type))
2345: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2346:
2347: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2348: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2349:
2350: cert = k->cert->certblob; /* for readability */
2351: sshbuf_reset(cert);
2352: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2353: goto out;
2354:
2355: /* -v01 certs put nonce first */
2356: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2357: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2358: goto out;
1.1 djm 2359:
2360: /* XXX this substantially duplicates to_blob(); refactor */
2361: switch (k->type) {
2362: #ifdef WITH_OPENSSL
2363: case KEY_DSA_CERT:
2364: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2365: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2366: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2367: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2368: goto out;
2369: break;
2370: case KEY_ECDSA_CERT:
2371: if ((ret = sshbuf_put_cstring(cert,
2372: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2373: (ret = sshbuf_put_ec(cert,
2374: EC_KEY_get0_public_key(k->ecdsa),
2375: EC_KEY_get0_group(k->ecdsa))) != 0)
2376: goto out;
2377: break;
2378: case KEY_RSA_CERT:
2379: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2380: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2381: goto out;
2382: break;
2383: #endif /* WITH_OPENSSL */
2384: case KEY_ED25519_CERT:
2385: if ((ret = sshbuf_put_string(cert,
2386: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2387: goto out;
2388: break;
2389: default:
2390: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2391: goto out;
1.1 djm 2392: }
2393:
1.20 djm 2394: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2395: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2396: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2397: goto out;
2398:
2399: if ((principals = sshbuf_new()) == NULL) {
2400: ret = SSH_ERR_ALLOC_FAIL;
2401: goto out;
2402: }
2403: for (i = 0; i < k->cert->nprincipals; i++) {
2404: if ((ret = sshbuf_put_cstring(principals,
2405: k->cert->principals[i])) != 0)
2406: goto out;
2407: }
2408: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2409: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2410: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2411: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2412: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2413: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2414: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2415: goto out;
2416:
2417: /* Sign the whole mess */
2418: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.33 djm 2419: sshbuf_len(cert), alg, 0)) != 0)
1.1 djm 2420: goto out;
2421:
2422: /* Append signature and we are done */
2423: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2424: goto out;
2425: ret = 0;
2426: out:
2427: if (ret != 0)
2428: sshbuf_reset(cert);
1.29 mmcc 2429: free(sig_blob);
2430: free(ca_blob);
1.31 mmcc 2431: sshbuf_free(principals);
1.1 djm 2432: return ret;
2433: }
2434:
2435: int
2436: sshkey_cert_check_authority(const struct sshkey *k,
2437: int want_host, int require_principal,
2438: const char *name, const char **reason)
2439: {
2440: u_int i, principal_matches;
2441: time_t now = time(NULL);
2442:
2443: if (reason != NULL)
2444: *reason = NULL;
2445:
2446: if (want_host) {
2447: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2448: *reason = "Certificate invalid: not a host certificate";
2449: return SSH_ERR_KEY_CERT_INVALID;
2450: }
2451: } else {
2452: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2453: *reason = "Certificate invalid: not a user certificate";
2454: return SSH_ERR_KEY_CERT_INVALID;
2455: }
2456: }
2457: if (now < 0) {
2458: /* yikes - system clock before epoch! */
2459: *reason = "Certificate invalid: not yet valid";
2460: return SSH_ERR_KEY_CERT_INVALID;
2461: }
2462: if ((u_int64_t)now < k->cert->valid_after) {
2463: *reason = "Certificate invalid: not yet valid";
2464: return SSH_ERR_KEY_CERT_INVALID;
2465: }
2466: if ((u_int64_t)now >= k->cert->valid_before) {
2467: *reason = "Certificate invalid: expired";
2468: return SSH_ERR_KEY_CERT_INVALID;
2469: }
2470: if (k->cert->nprincipals == 0) {
2471: if (require_principal) {
2472: *reason = "Certificate lacks principal list";
2473: return SSH_ERR_KEY_CERT_INVALID;
2474: }
2475: } else if (name != NULL) {
2476: principal_matches = 0;
2477: for (i = 0; i < k->cert->nprincipals; i++) {
2478: if (strcmp(name, k->cert->principals[i]) == 0) {
2479: principal_matches = 1;
2480: break;
2481: }
2482: }
2483: if (!principal_matches) {
2484: *reason = "Certificate invalid: name is not a listed "
2485: "principal";
2486: return SSH_ERR_KEY_CERT_INVALID;
2487: }
2488: }
2489: return 0;
1.27 djm 2490: }
2491:
2492: size_t
2493: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2494: {
2495: char from[32], to[32], ret[64];
2496: time_t tt;
2497: struct tm *tm;
2498:
2499: *from = *to = '\0';
2500: if (cert->valid_after == 0 &&
2501: cert->valid_before == 0xffffffffffffffffULL)
2502: return strlcpy(s, "forever", l);
2503:
2504: if (cert->valid_after != 0) {
2505: /* XXX revisit INT_MAX in 2038 :) */
2506: tt = cert->valid_after > INT_MAX ?
2507: INT_MAX : cert->valid_after;
2508: tm = localtime(&tt);
2509: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2510: }
2511: if (cert->valid_before != 0xffffffffffffffffULL) {
2512: /* XXX revisit INT_MAX in 2038 :) */
2513: tt = cert->valid_before > INT_MAX ?
2514: INT_MAX : cert->valid_before;
2515: tm = localtime(&tt);
2516: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2517: }
2518:
2519: if (cert->valid_after == 0)
2520: snprintf(ret, sizeof(ret), "before %s", to);
2521: else if (cert->valid_before == 0xffffffffffffffffULL)
2522: snprintf(ret, sizeof(ret), "after %s", from);
2523: else
2524: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2525:
2526: return strlcpy(s, ret, l);
1.1 djm 2527: }
2528:
2529: int
2530: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2531: {
2532: int r = SSH_ERR_INTERNAL_ERROR;
2533:
2534: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2535: goto out;
2536: switch (key->type) {
2537: #ifdef WITH_OPENSSL
2538: case KEY_RSA:
2539: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2540: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2541: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2542: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2543: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2544: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2545: goto out;
2546: break;
2547: case KEY_RSA_CERT:
2548: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2549: r = SSH_ERR_INVALID_ARGUMENT;
2550: goto out;
2551: }
2552: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2553: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2554: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2555: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2556: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2557: goto out;
2558: break;
2559: case KEY_DSA:
2560: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2561: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2562: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2563: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2564: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2565: goto out;
2566: break;
2567: case KEY_DSA_CERT:
2568: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2569: r = SSH_ERR_INVALID_ARGUMENT;
2570: goto out;
2571: }
2572: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2573: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2574: goto out;
2575: break;
2576: case KEY_ECDSA:
2577: if ((r = sshbuf_put_cstring(b,
2578: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2579: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2580: (r = sshbuf_put_bignum2(b,
2581: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2582: goto out;
2583: break;
2584: case KEY_ECDSA_CERT:
2585: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2586: r = SSH_ERR_INVALID_ARGUMENT;
2587: goto out;
2588: }
2589: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2590: (r = sshbuf_put_bignum2(b,
2591: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2592: goto out;
2593: break;
2594: #endif /* WITH_OPENSSL */
2595: case KEY_ED25519:
2596: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2597: ED25519_PK_SZ)) != 0 ||
2598: (r = sshbuf_put_string(b, key->ed25519_sk,
2599: ED25519_SK_SZ)) != 0)
2600: goto out;
2601: break;
2602: case KEY_ED25519_CERT:
2603: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2604: r = SSH_ERR_INVALID_ARGUMENT;
2605: goto out;
2606: }
2607: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2608: (r = sshbuf_put_string(b, key->ed25519_pk,
2609: ED25519_PK_SZ)) != 0 ||
2610: (r = sshbuf_put_string(b, key->ed25519_sk,
2611: ED25519_SK_SZ)) != 0)
2612: goto out;
2613: break;
2614: default:
2615: r = SSH_ERR_INVALID_ARGUMENT;
2616: goto out;
2617: }
2618: /* success */
2619: r = 0;
2620: out:
2621: return r;
2622: }
2623:
2624: int
2625: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2626: {
2627: char *tname = NULL, *curve = NULL;
2628: struct sshkey *k = NULL;
1.14 djm 2629: size_t pklen = 0, sklen = 0;
1.1 djm 2630: int type, r = SSH_ERR_INTERNAL_ERROR;
2631: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2632: #ifdef WITH_OPENSSL
2633: BIGNUM *exponent = NULL;
2634: #endif /* WITH_OPENSSL */
2635:
2636: if (kp != NULL)
2637: *kp = NULL;
2638: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2639: goto out;
2640: type = sshkey_type_from_name(tname);
2641: switch (type) {
2642: #ifdef WITH_OPENSSL
2643: case KEY_DSA:
2644: if ((k = sshkey_new_private(type)) == NULL) {
2645: r = SSH_ERR_ALLOC_FAIL;
2646: goto out;
2647: }
2648: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2649: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2650: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2651: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2652: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2653: goto out;
2654: break;
2655: case KEY_DSA_CERT:
1.14 djm 2656: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2657: (r = sshkey_add_private(k)) != 0 ||
2658: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2659: goto out;
2660: break;
2661: case KEY_ECDSA:
2662: if ((k = sshkey_new_private(type)) == NULL) {
2663: r = SSH_ERR_ALLOC_FAIL;
2664: goto out;
2665: }
2666: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2667: r = SSH_ERR_INVALID_ARGUMENT;
2668: goto out;
2669: }
2670: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2671: goto out;
2672: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2673: r = SSH_ERR_EC_CURVE_MISMATCH;
2674: goto out;
2675: }
2676: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2677: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2678: r = SSH_ERR_LIBCRYPTO_ERROR;
2679: goto out;
2680: }
2681: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2682: (r = sshbuf_get_bignum2(buf, exponent)))
2683: goto out;
2684: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2685: r = SSH_ERR_LIBCRYPTO_ERROR;
2686: goto out;
2687: }
2688: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2689: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2690: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2691: goto out;
2692: break;
2693: case KEY_ECDSA_CERT:
2694: if ((exponent = BN_new()) == NULL) {
2695: r = SSH_ERR_LIBCRYPTO_ERROR;
2696: goto out;
2697: }
1.14 djm 2698: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2699: (r = sshkey_add_private(k)) != 0 ||
2700: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2701: goto out;
2702: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2703: r = SSH_ERR_LIBCRYPTO_ERROR;
2704: goto out;
2705: }
2706: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2707: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2708: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2709: goto out;
2710: break;
2711: case KEY_RSA:
2712: if ((k = sshkey_new_private(type)) == NULL) {
2713: r = SSH_ERR_ALLOC_FAIL;
2714: goto out;
2715: }
2716: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2717: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2718: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2719: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2720: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2721: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2722: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2723: goto out;
2724: break;
2725: case KEY_RSA_CERT:
1.14 djm 2726: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2727: (r = sshkey_add_private(k)) != 0 ||
1.22 jsg 2728: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2729: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2730: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2731: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
1.1 djm 2732: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2733: goto out;
2734: break;
2735: #endif /* WITH_OPENSSL */
2736: case KEY_ED25519:
2737: if ((k = sshkey_new_private(type)) == NULL) {
2738: r = SSH_ERR_ALLOC_FAIL;
2739: goto out;
2740: }
2741: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2742: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2743: goto out;
2744: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2745: r = SSH_ERR_INVALID_FORMAT;
2746: goto out;
2747: }
2748: k->ed25519_pk = ed25519_pk;
2749: k->ed25519_sk = ed25519_sk;
2750: ed25519_pk = ed25519_sk = NULL;
2751: break;
2752: case KEY_ED25519_CERT:
1.14 djm 2753: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2754: (r = sshkey_add_private(k)) != 0 ||
2755: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2756: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2757: goto out;
2758: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2759: r = SSH_ERR_INVALID_FORMAT;
2760: goto out;
2761: }
2762: k->ed25519_pk = ed25519_pk;
2763: k->ed25519_sk = ed25519_sk;
2764: ed25519_pk = ed25519_sk = NULL;
2765: break;
2766: default:
2767: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2768: goto out;
2769: }
2770: #ifdef WITH_OPENSSL
2771: /* enable blinding */
2772: switch (k->type) {
2773: case KEY_RSA:
2774: case KEY_RSA_CERT:
2775: case KEY_RSA1:
2776: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2777: r = SSH_ERR_LIBCRYPTO_ERROR;
2778: goto out;
2779: }
2780: break;
2781: }
2782: #endif /* WITH_OPENSSL */
2783: /* success */
2784: r = 0;
2785: if (kp != NULL) {
2786: *kp = k;
2787: k = NULL;
2788: }
2789: out:
2790: free(tname);
2791: free(curve);
2792: #ifdef WITH_OPENSSL
2793: if (exponent != NULL)
2794: BN_clear_free(exponent);
2795: #endif /* WITH_OPENSSL */
2796: sshkey_free(k);
2797: if (ed25519_pk != NULL) {
2798: explicit_bzero(ed25519_pk, pklen);
2799: free(ed25519_pk);
2800: }
2801: if (ed25519_sk != NULL) {
2802: explicit_bzero(ed25519_sk, sklen);
2803: free(ed25519_sk);
2804: }
2805: return r;
2806: }
2807:
2808: #ifdef WITH_OPENSSL
2809: int
2810: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2811: {
2812: BN_CTX *bnctx;
2813: EC_POINT *nq = NULL;
2814: BIGNUM *order, *x, *y, *tmp;
2815: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 ! djm 2816:
! 2817: /*
! 2818: * NB. This assumes OpenSSL has already verified that the public
! 2819: * point lies on the curve. This is done by EC_POINT_oct2point()
! 2820: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
! 2821: * reachable with public points not unmarshalled using
! 2822: * EC_POINT_oct2point then the caller will need to explicitly check.
! 2823: */
1.1 djm 2824:
2825: if ((bnctx = BN_CTX_new()) == NULL)
2826: return SSH_ERR_ALLOC_FAIL;
2827: BN_CTX_start(bnctx);
2828:
2829: /*
2830: * We shouldn't ever hit this case because bignum_get_ecpoint()
2831: * refuses to load GF2m points.
2832: */
2833: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2834: NID_X9_62_prime_field)
2835: goto out;
2836:
2837: /* Q != infinity */
2838: if (EC_POINT_is_at_infinity(group, public))
2839: goto out;
2840:
2841: if ((x = BN_CTX_get(bnctx)) == NULL ||
2842: (y = BN_CTX_get(bnctx)) == NULL ||
2843: (order = BN_CTX_get(bnctx)) == NULL ||
2844: (tmp = BN_CTX_get(bnctx)) == NULL) {
2845: ret = SSH_ERR_ALLOC_FAIL;
2846: goto out;
2847: }
2848:
2849: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2850: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2851: EC_POINT_get_affine_coordinates_GFp(group, public,
2852: x, y, bnctx) != 1) {
2853: ret = SSH_ERR_LIBCRYPTO_ERROR;
2854: goto out;
2855: }
2856: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2857: BN_num_bits(y) <= BN_num_bits(order) / 2)
2858: goto out;
2859:
2860: /* nQ == infinity (n == order of subgroup) */
2861: if ((nq = EC_POINT_new(group)) == NULL) {
2862: ret = SSH_ERR_ALLOC_FAIL;
2863: goto out;
2864: }
2865: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2866: ret = SSH_ERR_LIBCRYPTO_ERROR;
2867: goto out;
2868: }
2869: if (EC_POINT_is_at_infinity(group, nq) != 1)
2870: goto out;
2871:
2872: /* x < order - 1, y < order - 1 */
2873: if (!BN_sub(tmp, order, BN_value_one())) {
2874: ret = SSH_ERR_LIBCRYPTO_ERROR;
2875: goto out;
2876: }
2877: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2878: goto out;
2879: ret = 0;
2880: out:
2881: BN_CTX_free(bnctx);
2882: if (nq != NULL)
2883: EC_POINT_free(nq);
2884: return ret;
2885: }
2886:
2887: int
2888: sshkey_ec_validate_private(const EC_KEY *key)
2889: {
2890: BN_CTX *bnctx;
2891: BIGNUM *order, *tmp;
2892: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2893:
2894: if ((bnctx = BN_CTX_new()) == NULL)
2895: return SSH_ERR_ALLOC_FAIL;
2896: BN_CTX_start(bnctx);
2897:
2898: if ((order = BN_CTX_get(bnctx)) == NULL ||
2899: (tmp = BN_CTX_get(bnctx)) == NULL) {
2900: ret = SSH_ERR_ALLOC_FAIL;
2901: goto out;
2902: }
2903:
2904: /* log2(private) > log2(order)/2 */
2905: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2906: ret = SSH_ERR_LIBCRYPTO_ERROR;
2907: goto out;
2908: }
2909: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2910: BN_num_bits(order) / 2)
2911: goto out;
2912:
2913: /* private < order - 1 */
2914: if (!BN_sub(tmp, order, BN_value_one())) {
2915: ret = SSH_ERR_LIBCRYPTO_ERROR;
2916: goto out;
2917: }
2918: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2919: goto out;
2920: ret = 0;
2921: out:
2922: BN_CTX_free(bnctx);
2923: return ret;
2924: }
2925:
2926: void
2927: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2928: {
2929: BIGNUM *x, *y;
2930: BN_CTX *bnctx;
2931:
2932: if (point == NULL) {
2933: fputs("point=(NULL)\n", stderr);
2934: return;
2935: }
2936: if ((bnctx = BN_CTX_new()) == NULL) {
2937: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2938: return;
2939: }
2940: BN_CTX_start(bnctx);
2941: if ((x = BN_CTX_get(bnctx)) == NULL ||
2942: (y = BN_CTX_get(bnctx)) == NULL) {
2943: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2944: return;
2945: }
2946: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2947: NID_X9_62_prime_field) {
2948: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2949: return;
2950: }
2951: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2952: bnctx) != 1) {
2953: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2954: __func__);
2955: return;
2956: }
2957: fputs("x=", stderr);
2958: BN_print_fp(stderr, x);
2959: fputs("\ny=", stderr);
2960: BN_print_fp(stderr, y);
2961: fputs("\n", stderr);
2962: BN_CTX_free(bnctx);
2963: }
2964:
2965: void
2966: sshkey_dump_ec_key(const EC_KEY *key)
2967: {
2968: const BIGNUM *exponent;
2969:
2970: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2971: EC_KEY_get0_public_key(key));
2972: fputs("exponent=", stderr);
2973: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2974: fputs("(NULL)", stderr);
2975: else
2976: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2977: fputs("\n", stderr);
2978: }
2979: #endif /* WITH_OPENSSL */
2980:
2981: static int
2982: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2983: const char *passphrase, const char *comment, const char *ciphername,
2984: int rounds)
2985: {
1.4 djm 2986: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2987: u_char salt[SALT_LEN];
1.4 djm 2988: char *b64 = NULL;
1.1 djm 2989: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2990: u_int check;
2991: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 2992: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 2993: const struct sshcipher *cipher;
2994: const char *kdfname = KDFNAME;
2995: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2996:
2997: if (rounds <= 0)
2998: rounds = DEFAULT_ROUNDS;
2999: if (passphrase == NULL || !strlen(passphrase)) {
3000: ciphername = "none";
3001: kdfname = "none";
3002: } else if (ciphername == NULL)
3003: ciphername = DEFAULT_CIPHERNAME;
3004: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
3005: r = SSH_ERR_INVALID_ARGUMENT;
3006: goto out;
3007: }
3008: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3009: r = SSH_ERR_INTERNAL_ERROR;
3010: goto out;
3011: }
3012:
3013: if ((kdf = sshbuf_new()) == NULL ||
3014: (encoded = sshbuf_new()) == NULL ||
3015: (encrypted = sshbuf_new()) == NULL) {
3016: r = SSH_ERR_ALLOC_FAIL;
3017: goto out;
3018: }
3019: blocksize = cipher_blocksize(cipher);
3020: keylen = cipher_keylen(cipher);
3021: ivlen = cipher_ivlen(cipher);
3022: authlen = cipher_authlen(cipher);
3023: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3024: r = SSH_ERR_ALLOC_FAIL;
3025: goto out;
3026: }
3027: if (strcmp(kdfname, "bcrypt") == 0) {
3028: arc4random_buf(salt, SALT_LEN);
3029: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3030: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3031: r = SSH_ERR_INVALID_ARGUMENT;
3032: goto out;
3033: }
3034: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3035: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3036: goto out;
3037: } else if (strcmp(kdfname, "none") != 0) {
3038: /* Unsupported KDF type */
3039: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3040: goto out;
3041: }
3042: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3043: key + keylen, ivlen, 1)) != 0)
3044: goto out;
3045:
3046: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3047: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3048: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3049: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3050: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3051: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3052: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3053: goto out;
3054:
3055: /* set up the buffer that will be encrypted */
3056:
3057: /* Random check bytes */
3058: check = arc4random();
3059: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3060: (r = sshbuf_put_u32(encrypted, check)) != 0)
3061: goto out;
3062:
3063: /* append private key and comment*/
3064: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3065: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3066: goto out;
3067:
3068: /* padding */
3069: i = 0;
3070: while (sshbuf_len(encrypted) % blocksize) {
3071: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3072: goto out;
3073: }
3074:
3075: /* length in destination buffer */
3076: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3077: goto out;
3078:
3079: /* encrypt */
3080: if ((r = sshbuf_reserve(encoded,
3081: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3082: goto out;
1.36 djm 3083: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3084: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3085: goto out;
3086:
3087: /* uuencode */
3088: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3089: r = SSH_ERR_ALLOC_FAIL;
3090: goto out;
3091: }
3092:
3093: sshbuf_reset(blob);
3094: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3095: goto out;
3096: for (i = 0; i < strlen(b64); i++) {
3097: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3098: goto out;
3099: /* insert line breaks */
3100: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3101: goto out;
3102: }
3103: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3104: goto out;
3105: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3106: goto out;
3107:
3108: /* success */
3109: r = 0;
3110:
3111: out:
3112: sshbuf_free(kdf);
3113: sshbuf_free(encoded);
3114: sshbuf_free(encrypted);
1.36 djm 3115: cipher_free(ciphercontext);
1.1 djm 3116: explicit_bzero(salt, sizeof(salt));
3117: if (key != NULL) {
3118: explicit_bzero(key, keylen + ivlen);
3119: free(key);
3120: }
3121: if (pubkeyblob != NULL) {
3122: explicit_bzero(pubkeyblob, pubkeylen);
3123: free(pubkeyblob);
3124: }
3125: if (b64 != NULL) {
3126: explicit_bzero(b64, strlen(b64));
3127: free(b64);
3128: }
3129: return r;
3130: }
3131:
3132: static int
3133: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3134: struct sshkey **keyp, char **commentp)
3135: {
3136: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3137: const struct sshcipher *cipher = NULL;
3138: const u_char *cp;
3139: int r = SSH_ERR_INTERNAL_ERROR;
3140: size_t encoded_len;
1.18 djm 3141: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3142: struct sshbuf *encoded = NULL, *decoded = NULL;
3143: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3144: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3145: struct sshkey *k = NULL;
3146: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3147: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3148:
3149: if (keyp != NULL)
3150: *keyp = NULL;
3151: if (commentp != NULL)
3152: *commentp = NULL;
3153:
3154: if ((encoded = sshbuf_new()) == NULL ||
3155: (decoded = sshbuf_new()) == NULL ||
3156: (decrypted = sshbuf_new()) == NULL) {
3157: r = SSH_ERR_ALLOC_FAIL;
3158: goto out;
3159: }
3160:
3161: /* check preamble */
3162: cp = sshbuf_ptr(blob);
3163: encoded_len = sshbuf_len(blob);
3164: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3165: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3166: r = SSH_ERR_INVALID_FORMAT;
3167: goto out;
3168: }
3169: cp += MARK_BEGIN_LEN;
3170: encoded_len -= MARK_BEGIN_LEN;
3171:
3172: /* Look for end marker, removing whitespace as we go */
3173: while (encoded_len > 0) {
3174: if (*cp != '\n' && *cp != '\r') {
3175: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3176: goto out;
3177: }
3178: last = *cp;
3179: encoded_len--;
3180: cp++;
3181: if (last == '\n') {
3182: if (encoded_len >= MARK_END_LEN &&
3183: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3184: /* \0 terminate */
3185: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3186: goto out;
3187: break;
3188: }
3189: }
3190: }
3191: if (encoded_len == 0) {
3192: r = SSH_ERR_INVALID_FORMAT;
3193: goto out;
3194: }
3195:
3196: /* decode base64 */
1.4 djm 3197: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3198: goto out;
3199:
3200: /* check magic */
3201: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3202: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3203: r = SSH_ERR_INVALID_FORMAT;
3204: goto out;
3205: }
3206: /* parse public portion of key */
3207: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3208: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3209: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3210: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3211: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3212: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3213: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3214: goto out;
3215:
3216: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3217: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3218: goto out;
3219: }
3220: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3221: strcmp(ciphername, "none") != 0) {
3222: /* passphrase required */
3223: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3224: goto out;
3225: }
3226: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3227: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3228: goto out;
3229: }
3230: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3231: r = SSH_ERR_INVALID_FORMAT;
3232: goto out;
3233: }
3234: if (nkeys != 1) {
3235: /* XXX only one key supported */
3236: r = SSH_ERR_INVALID_FORMAT;
3237: goto out;
3238: }
3239:
3240: /* check size of encrypted key blob */
3241: blocksize = cipher_blocksize(cipher);
3242: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3243: r = SSH_ERR_INVALID_FORMAT;
3244: goto out;
3245: }
3246:
3247: /* setup key */
3248: keylen = cipher_keylen(cipher);
3249: ivlen = cipher_ivlen(cipher);
1.18 djm 3250: authlen = cipher_authlen(cipher);
1.1 djm 3251: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3252: r = SSH_ERR_ALLOC_FAIL;
3253: goto out;
3254: }
3255: if (strcmp(kdfname, "bcrypt") == 0) {
3256: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3257: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3258: goto out;
3259: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3260: key, keylen + ivlen, rounds) < 0) {
3261: r = SSH_ERR_INVALID_FORMAT;
3262: goto out;
3263: }
3264: }
3265:
1.18 djm 3266: /* check that an appropriate amount of auth data is present */
3267: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3268: r = SSH_ERR_INVALID_FORMAT;
3269: goto out;
3270: }
3271:
1.1 djm 3272: /* decrypt private portion of key */
3273: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3274: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3275: key + keylen, ivlen, 0)) != 0)
3276: goto out;
1.36 djm 3277: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3278: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3279: /* an integrity error here indicates an incorrect passphrase */
3280: if (r == SSH_ERR_MAC_INVALID)
3281: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3282: goto out;
3283: }
1.18 djm 3284: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3285: goto out;
3286: /* there should be no trailing data */
3287: if (sshbuf_len(decoded) != 0) {
3288: r = SSH_ERR_INVALID_FORMAT;
3289: goto out;
3290: }
3291:
3292: /* check check bytes */
3293: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3294: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3295: goto out;
3296: if (check1 != check2) {
3297: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3298: goto out;
3299: }
3300:
3301: /* Load the private key and comment */
3302: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3303: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3304: goto out;
3305:
3306: /* Check deterministic padding */
3307: i = 0;
3308: while (sshbuf_len(decrypted)) {
3309: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3310: goto out;
3311: if (pad != (++i & 0xff)) {
3312: r = SSH_ERR_INVALID_FORMAT;
3313: goto out;
3314: }
3315: }
3316:
3317: /* XXX decode pubkey and check against private */
3318:
3319: /* success */
3320: r = 0;
3321: if (keyp != NULL) {
3322: *keyp = k;
3323: k = NULL;
3324: }
3325: if (commentp != NULL) {
3326: *commentp = comment;
3327: comment = NULL;
3328: }
3329: out:
3330: pad = 0;
1.36 djm 3331: cipher_free(ciphercontext);
1.1 djm 3332: free(ciphername);
3333: free(kdfname);
3334: free(comment);
3335: if (salt != NULL) {
3336: explicit_bzero(salt, slen);
3337: free(salt);
3338: }
3339: if (key != NULL) {
3340: explicit_bzero(key, keylen + ivlen);
3341: free(key);
3342: }
3343: sshbuf_free(encoded);
3344: sshbuf_free(decoded);
3345: sshbuf_free(kdf);
3346: sshbuf_free(decrypted);
3347: sshkey_free(k);
3348: return r;
3349: }
3350:
3351: #if WITH_SSH1
3352: /*
3353: * Serialises the authentication (private) key to a blob, encrypting it with
3354: * passphrase. The identification of the blob (lowest 64 bits of n) will
3355: * precede the key to provide identification of the key without needing a
3356: * passphrase.
3357: */
3358: static int
3359: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3360: const char *passphrase, const char *comment)
3361: {
3362: struct sshbuf *buffer = NULL, *encrypted = NULL;
3363: u_char buf[8];
3364: int r, cipher_num;
1.36 djm 3365: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3366: const struct sshcipher *cipher;
3367: u_char *cp;
3368:
3369: /*
3370: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3371: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3372: */
3373: cipher_num = (strcmp(passphrase, "") == 0) ?
3374: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3375: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3376: return SSH_ERR_INTERNAL_ERROR;
3377:
3378: /* This buffer is used to build the secret part of the private key. */
3379: if ((buffer = sshbuf_new()) == NULL)
3380: return SSH_ERR_ALLOC_FAIL;
3381:
3382: /* Put checkbytes for checking passphrase validity. */
3383: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3384: goto out;
3385: arc4random_buf(cp, 2);
3386: memcpy(cp + 2, cp, 2);
3387:
3388: /*
3389: * Store the private key (n and e will not be stored because they
3390: * will be stored in plain text, and storing them also in encrypted
3391: * format would just give known plaintext).
3392: * Note: q and p are stored in reverse order to SSL.
3393: */
3394: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3395: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3396: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3397: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3398: goto out;
3399:
3400: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3401: explicit_bzero(buf, 8);
3402: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3403: goto out;
3404:
3405: /* This buffer will be used to contain the data in the file. */
3406: if ((encrypted = sshbuf_new()) == NULL) {
3407: r = SSH_ERR_ALLOC_FAIL;
3408: goto out;
3409: }
3410:
3411: /* First store keyfile id string. */
3412: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3413: sizeof(LEGACY_BEGIN))) != 0)
3414: goto out;
3415:
3416: /* Store cipher type and "reserved" field. */
3417: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3418: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3419: goto out;
3420:
3421: /* Store public key. This will be in plain text. */
3422: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
1.22 jsg 3423: (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 ||
3424: (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 ||
3425: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
1.1 djm 3426: goto out;
3427:
3428: /* Allocate space for the private part of the key in the buffer. */
3429: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3430: goto out;
3431:
3432: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3433: CIPHER_ENCRYPT)) != 0)
3434: goto out;
1.36 djm 3435: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3436: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3437: goto out;
3438:
3439: r = sshbuf_putb(blob, encrypted);
3440:
3441: out:
1.36 djm 3442: cipher_free(ciphercontext);
1.1 djm 3443: explicit_bzero(buf, sizeof(buf));
1.31 mmcc 3444: sshbuf_free(buffer);
3445: sshbuf_free(encrypted);
1.1 djm 3446:
3447: return r;
3448: }
3449: #endif /* WITH_SSH1 */
3450:
3451: #ifdef WITH_OPENSSL
3452: /* convert SSH v2 key in OpenSSL PEM format */
3453: static int
3454: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3455: const char *_passphrase, const char *comment)
3456: {
3457: int success, r;
3458: int blen, len = strlen(_passphrase);
3459: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3460: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3461: const u_char *bptr;
3462: BIO *bio = NULL;
3463:
3464: if (len > 0 && len <= 4)
3465: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3466: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3467: return SSH_ERR_ALLOC_FAIL;
3468:
3469: switch (key->type) {
3470: case KEY_DSA:
3471: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3472: cipher, passphrase, len, NULL, NULL);
3473: break;
3474: case KEY_ECDSA:
3475: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3476: cipher, passphrase, len, NULL, NULL);
3477: break;
3478: case KEY_RSA:
3479: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3480: cipher, passphrase, len, NULL, NULL);
3481: break;
3482: default:
3483: success = 0;
3484: break;
3485: }
3486: if (success == 0) {
3487: r = SSH_ERR_LIBCRYPTO_ERROR;
3488: goto out;
3489: }
3490: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3491: r = SSH_ERR_INTERNAL_ERROR;
3492: goto out;
3493: }
3494: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3495: goto out;
3496: r = 0;
3497: out:
3498: BIO_free(bio);
3499: return r;
3500: }
3501: #endif /* WITH_OPENSSL */
3502:
3503: /* Serialise "key" to buffer "blob" */
3504: int
3505: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3506: const char *passphrase, const char *comment,
3507: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3508: {
3509: switch (key->type) {
1.9 markus 3510: #ifdef WITH_SSH1
1.1 djm 3511: case KEY_RSA1:
3512: return sshkey_private_rsa1_to_blob(key, blob,
3513: passphrase, comment);
1.9 markus 3514: #endif /* WITH_SSH1 */
3515: #ifdef WITH_OPENSSL
1.1 djm 3516: case KEY_DSA:
3517: case KEY_ECDSA:
3518: case KEY_RSA:
3519: if (force_new_format) {
3520: return sshkey_private_to_blob2(key, blob, passphrase,
3521: comment, new_format_cipher, new_format_rounds);
3522: }
3523: return sshkey_private_pem_to_blob(key, blob,
3524: passphrase, comment);
3525: #endif /* WITH_OPENSSL */
3526: case KEY_ED25519:
3527: return sshkey_private_to_blob2(key, blob, passphrase,
3528: comment, new_format_cipher, new_format_rounds);
3529: default:
3530: return SSH_ERR_KEY_TYPE_UNKNOWN;
3531: }
3532: }
3533:
3534: #ifdef WITH_SSH1
3535: /*
3536: * Parse the public, unencrypted portion of a RSA1 key.
3537: */
3538: int
3539: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3540: struct sshkey **keyp, char **commentp)
3541: {
3542: int r;
3543: struct sshkey *pub = NULL;
3544: struct sshbuf *copy = NULL;
3545:
3546: if (keyp != NULL)
3547: *keyp = NULL;
3548: if (commentp != NULL)
3549: *commentp = NULL;
3550:
3551: /* Check that it is at least big enough to contain the ID string. */
3552: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3553: return SSH_ERR_INVALID_FORMAT;
3554:
3555: /*
3556: * Make sure it begins with the id string. Consume the id string
3557: * from the buffer.
3558: */
3559: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3560: return SSH_ERR_INVALID_FORMAT;
3561: /* Make a working copy of the keyblob and skip past the magic */
3562: if ((copy = sshbuf_fromb(blob)) == NULL)
3563: return SSH_ERR_ALLOC_FAIL;
3564: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3565: goto out;
3566:
3567: /* Skip cipher type, reserved data and key bits. */
3568: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3569: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3570: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3571: goto out;
3572:
3573: /* Read the public key from the buffer. */
3574: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3575: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3576: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3577: goto out;
3578:
3579: /* Finally, the comment */
3580: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3581: goto out;
3582:
3583: /* The encrypted private part is not parsed by this function. */
3584:
3585: r = 0;
1.32 djm 3586: if (keyp != NULL) {
1.1 djm 3587: *keyp = pub;
1.32 djm 3588: pub = NULL;
3589: }
1.1 djm 3590: out:
1.31 mmcc 3591: sshbuf_free(copy);
1.30 mmcc 3592: sshkey_free(pub);
1.1 djm 3593: return r;
3594: }
3595:
3596: static int
3597: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3598: struct sshkey **keyp, char **commentp)
3599: {
3600: int r;
3601: u_int16_t check1, check2;
3602: u_int8_t cipher_type;
3603: struct sshbuf *decrypted = NULL, *copy = NULL;
3604: u_char *cp;
3605: char *comment = NULL;
1.36 djm 3606: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3607: const struct sshcipher *cipher;
3608: struct sshkey *prv = NULL;
3609:
1.32 djm 3610: if (keyp != NULL)
3611: *keyp = NULL;
1.1 djm 3612: if (commentp != NULL)
3613: *commentp = NULL;
3614:
3615: /* Check that it is at least big enough to contain the ID string. */
3616: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3617: return SSH_ERR_INVALID_FORMAT;
3618:
3619: /*
3620: * Make sure it begins with the id string. Consume the id string
3621: * from the buffer.
3622: */
3623: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3624: return SSH_ERR_INVALID_FORMAT;
3625:
3626: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3627: r = SSH_ERR_ALLOC_FAIL;
3628: goto out;
3629: }
3630: if ((copy = sshbuf_fromb(blob)) == NULL ||
3631: (decrypted = sshbuf_new()) == NULL) {
3632: r = SSH_ERR_ALLOC_FAIL;
3633: goto out;
3634: }
3635: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3636: goto out;
3637:
3638: /* Read cipher type. */
3639: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3640: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3641: goto out;
3642:
3643: /* Read the public key and comment from the buffer. */
3644: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3645: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3646: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3647: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3648: goto out;
3649:
3650: /* Check that it is a supported cipher. */
3651: cipher = cipher_by_number(cipher_type);
3652: if (cipher == NULL) {
3653: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3654: goto out;
3655: }
3656: /* Initialize space for decrypted data. */
3657: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3658: goto out;
3659:
3660: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3661: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3662: CIPHER_DECRYPT)) != 0)
3663: goto out;
1.36 djm 3664: if ((r = cipher_crypt(ciphercontext, 0, cp,
3665: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0)
1.1 djm 3666: goto out;
3667:
3668: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3669: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3670: goto out;
3671: if (check1 != check2) {
3672: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3673: goto out;
3674: }
3675:
3676: /* Read the rest of the private key. */
3677: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3678: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3679: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3680: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3681: goto out;
3682:
3683: /* calculate p-1 and q-1 */
3684: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3685: goto out;
3686:
3687: /* enable blinding */
3688: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3689: r = SSH_ERR_LIBCRYPTO_ERROR;
3690: goto out;
3691: }
3692: r = 0;
1.32 djm 3693: if (keyp != NULL) {
3694: *keyp = prv;
3695: prv = NULL;
3696: }
1.1 djm 3697: if (commentp != NULL) {
3698: *commentp = comment;
3699: comment = NULL;
3700: }
3701: out:
1.36 djm 3702: cipher_free(ciphercontext);
1.29 mmcc 3703: free(comment);
1.30 mmcc 3704: sshkey_free(prv);
1.31 mmcc 3705: sshbuf_free(copy);
3706: sshbuf_free(decrypted);
1.1 djm 3707: return r;
3708: }
3709: #endif /* WITH_SSH1 */
3710:
3711: #ifdef WITH_OPENSSL
1.8 djm 3712: static int
1.1 djm 3713: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3714: const char *passphrase, struct sshkey **keyp)
1.1 djm 3715: {
3716: EVP_PKEY *pk = NULL;
3717: struct sshkey *prv = NULL;
3718: BIO *bio = NULL;
3719: int r;
3720:
1.32 djm 3721: if (keyp != NULL)
3722: *keyp = NULL;
1.1 djm 3723:
3724: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3725: return SSH_ERR_ALLOC_FAIL;
3726: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3727: (int)sshbuf_len(blob)) {
3728: r = SSH_ERR_ALLOC_FAIL;
3729: goto out;
3730: }
3731:
3732: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3733: (char *)passphrase)) == NULL) {
1.35 djm 3734: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
1.1 djm 3735: goto out;
3736: }
3737: if (pk->type == EVP_PKEY_RSA &&
3738: (type == KEY_UNSPEC || type == KEY_RSA)) {
3739: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3740: r = SSH_ERR_ALLOC_FAIL;
3741: goto out;
3742: }
3743: prv->rsa = EVP_PKEY_get1_RSA(pk);
3744: prv->type = KEY_RSA;
3745: #ifdef DEBUG_PK
3746: RSA_print_fp(stderr, prv->rsa, 8);
3747: #endif
3748: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3749: r = SSH_ERR_LIBCRYPTO_ERROR;
3750: goto out;
3751: }
3752: } else if (pk->type == EVP_PKEY_DSA &&
3753: (type == KEY_UNSPEC || type == KEY_DSA)) {
3754: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3755: r = SSH_ERR_ALLOC_FAIL;
3756: goto out;
3757: }
3758: prv->dsa = EVP_PKEY_get1_DSA(pk);
3759: prv->type = KEY_DSA;
3760: #ifdef DEBUG_PK
3761: DSA_print_fp(stderr, prv->dsa, 8);
3762: #endif
3763: } else if (pk->type == EVP_PKEY_EC &&
3764: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3765: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3766: r = SSH_ERR_ALLOC_FAIL;
3767: goto out;
3768: }
3769: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3770: prv->type = KEY_ECDSA;
3771: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3772: if (prv->ecdsa_nid == -1 ||
3773: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3774: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3775: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3776: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3777: r = SSH_ERR_INVALID_FORMAT;
3778: goto out;
3779: }
3780: #ifdef DEBUG_PK
3781: if (prv != NULL && prv->ecdsa != NULL)
3782: sshkey_dump_ec_key(prv->ecdsa);
3783: #endif
3784: } else {
3785: r = SSH_ERR_INVALID_FORMAT;
3786: goto out;
3787: }
3788: r = 0;
1.32 djm 3789: if (keyp != NULL) {
3790: *keyp = prv;
3791: prv = NULL;
3792: }
1.1 djm 3793: out:
3794: BIO_free(bio);
3795: if (pk != NULL)
3796: EVP_PKEY_free(pk);
1.30 mmcc 3797: sshkey_free(prv);
1.1 djm 3798: return r;
3799: }
3800: #endif /* WITH_OPENSSL */
3801:
3802: int
3803: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3804: const char *passphrase, struct sshkey **keyp, char **commentp)
3805: {
1.32 djm 3806: if (keyp != NULL)
3807: *keyp = NULL;
1.1 djm 3808: if (commentp != NULL)
3809: *commentp = NULL;
3810:
3811: switch (type) {
1.9 markus 3812: #ifdef WITH_SSH1
1.1 djm 3813: case KEY_RSA1:
3814: return sshkey_parse_private_rsa1(blob, passphrase,
3815: keyp, commentp);
1.9 markus 3816: #endif /* WITH_SSH1 */
3817: #ifdef WITH_OPENSSL
1.1 djm 3818: case KEY_DSA:
3819: case KEY_ECDSA:
3820: case KEY_RSA:
1.8 djm 3821: return sshkey_parse_private_pem_fileblob(blob, type,
3822: passphrase, keyp);
1.1 djm 3823: #endif /* WITH_OPENSSL */
3824: case KEY_ED25519:
3825: return sshkey_parse_private2(blob, type, passphrase,
3826: keyp, commentp);
3827: case KEY_UNSPEC:
1.23 tim 3828: if (sshkey_parse_private2(blob, type, passphrase, keyp,
3829: commentp) == 0)
1.1 djm 3830: return 0;
3831: #ifdef WITH_OPENSSL
1.8 djm 3832: return sshkey_parse_private_pem_fileblob(blob, type,
3833: passphrase, keyp);
1.1 djm 3834: #else
3835: return SSH_ERR_INVALID_FORMAT;
3836: #endif /* WITH_OPENSSL */
3837: default:
3838: return SSH_ERR_KEY_TYPE_UNKNOWN;
3839: }
3840: }
3841:
3842: int
3843: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3844: struct sshkey **keyp, char **commentp)
1.1 djm 3845: {
3846: if (keyp != NULL)
3847: *keyp = NULL;
3848: if (commentp != NULL)
3849: *commentp = NULL;
3850:
3851: #ifdef WITH_SSH1
3852: /* it's a SSH v1 key if the public key part is readable */
1.23 tim 3853: if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) {
1.1 djm 3854: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3855: passphrase, keyp, commentp);
3856: }
3857: #endif /* WITH_SSH1 */
1.23 tim 3858: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3859: passphrase, keyp, commentp);
1.1 djm 3860: }
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