Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.47
1.47 ! djm 1: /* $OpenBSD: sshkey.c,v 1.46 2017/04/30 23:10:43 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: { "ssh-rsa", "RSA", KEY_RSA, 0, 0, 0 },
89: { "rsa-sha2-256", "RSA", KEY_RSA, 0, 0, 1 },
90: { "rsa-sha2-512", "RSA", KEY_RSA, 0, 0, 1 },
91: { "ssh-dss", "DSA", KEY_DSA, 0, 0, 0 },
92: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
93: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0, 0 },
94: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0, 0 },
95: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1, 0 },
96: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1, 0 },
1.1 djm 97: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 98: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.1 djm 99: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 100: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.1 djm 101: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
1.28 markus 102: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.1 djm 103: #endif /* WITH_OPENSSL */
1.28 markus 104: { NULL, NULL, -1, -1, 0, 0 }
1.1 djm 105: };
106:
107: const char *
108: sshkey_type(const struct sshkey *k)
109: {
110: const struct keytype *kt;
111:
112: for (kt = keytypes; kt->type != -1; kt++) {
113: if (kt->type == k->type)
114: return kt->shortname;
115: }
116: return "unknown";
117: }
118:
119: static const char *
120: sshkey_ssh_name_from_type_nid(int type, int nid)
121: {
122: const struct keytype *kt;
123:
124: for (kt = keytypes; kt->type != -1; kt++) {
125: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
126: return kt->name;
127: }
128: return "ssh-unknown";
129: }
130:
131: int
132: sshkey_type_is_cert(int type)
133: {
134: const struct keytype *kt;
135:
136: for (kt = keytypes; kt->type != -1; kt++) {
137: if (kt->type == type)
138: return kt->cert;
139: }
140: return 0;
141: }
142:
143: const char *
144: sshkey_ssh_name(const struct sshkey *k)
145: {
146: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
147: }
148:
149: const char *
150: sshkey_ssh_name_plain(const struct sshkey *k)
151: {
152: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
153: k->ecdsa_nid);
154: }
155:
156: int
157: sshkey_type_from_name(const char *name)
158: {
159: const struct keytype *kt;
160:
161: for (kt = keytypes; kt->type != -1; kt++) {
162: /* Only allow shortname matches for plain key types */
163: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
164: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
165: return kt->type;
166: }
167: return KEY_UNSPEC;
168: }
169:
170: int
171: sshkey_ecdsa_nid_from_name(const char *name)
172: {
173: const struct keytype *kt;
174:
1.4 djm 175: for (kt = keytypes; kt->type != -1; kt++) {
176: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
177: continue;
178: if (kt->name != NULL && strcmp(name, kt->name) == 0)
179: return kt->nid;
180: }
1.1 djm 181: return -1;
182: }
183:
184: char *
1.45 djm 185: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 186: {
187: char *tmp, *ret = NULL;
188: size_t nlen, rlen = 0;
189: const struct keytype *kt;
190:
191: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 192: if (kt->name == NULL)
193: continue;
194: if (!include_sigonly && kt->sigonly)
1.1 djm 195: continue;
196: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
197: continue;
198: if (ret != NULL)
1.38 djm 199: ret[rlen++] = sep;
1.1 djm 200: nlen = strlen(kt->name);
201: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
202: free(ret);
203: return NULL;
204: }
205: ret = tmp;
206: memcpy(ret + rlen, kt->name, nlen + 1);
207: rlen += nlen;
208: }
209: return ret;
210: }
211:
212: int
1.11 djm 213: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 214: {
215: char *s, *cp, *p;
1.11 djm 216: const struct keytype *kt;
217: int type;
1.1 djm 218:
219: if (names == NULL || strcmp(names, "") == 0)
220: return 0;
221: if ((s = cp = strdup(names)) == NULL)
222: return 0;
223: for ((p = strsep(&cp, ",")); p && *p != '\0';
224: (p = strsep(&cp, ","))) {
1.11 djm 225: type = sshkey_type_from_name(p);
226: if (type == KEY_RSA1) {
227: free(s);
228: return 0;
229: }
230: if (type == KEY_UNSPEC) {
231: if (allow_wildcard) {
232: /*
233: * Try matching key types against the string.
234: * If any has a positive or negative match then
235: * the component is accepted.
236: */
237: for (kt = keytypes; kt->type != -1; kt++) {
238: if (kt->type == KEY_RSA1)
239: continue;
240: if (match_pattern_list(kt->name,
1.17 djm 241: p, 0) != 0)
1.11 djm 242: break;
243: }
244: if (kt->type != -1)
245: continue;
246: }
1.1 djm 247: free(s);
248: return 0;
249: }
250: }
251: free(s);
252: return 1;
253: }
254:
255: u_int
256: sshkey_size(const struct sshkey *k)
257: {
258: switch (k->type) {
259: #ifdef WITH_OPENSSL
260: case KEY_RSA1:
261: case KEY_RSA:
262: case KEY_RSA_CERT:
263: return BN_num_bits(k->rsa->n);
264: case KEY_DSA:
265: case KEY_DSA_CERT:
266: return BN_num_bits(k->dsa->p);
267: case KEY_ECDSA:
268: case KEY_ECDSA_CERT:
269: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
270: #endif /* WITH_OPENSSL */
271: case KEY_ED25519:
272: case KEY_ED25519_CERT:
273: return 256; /* XXX */
274: }
275: return 0;
276: }
277:
278: static int
279: sshkey_type_is_valid_ca(int type)
280: {
281: switch (type) {
282: case KEY_RSA:
283: case KEY_DSA:
284: case KEY_ECDSA:
285: case KEY_ED25519:
286: return 1;
287: default:
288: return 0;
289: }
290: }
291:
292: int
293: sshkey_is_cert(const struct sshkey *k)
294: {
295: if (k == NULL)
296: return 0;
297: return sshkey_type_is_cert(k->type);
298: }
299:
300: /* Return the cert-less equivalent to a certified key type */
301: int
302: sshkey_type_plain(int type)
303: {
304: switch (type) {
305: case KEY_RSA_CERT:
306: return KEY_RSA;
307: case KEY_DSA_CERT:
308: return KEY_DSA;
309: case KEY_ECDSA_CERT:
310: return KEY_ECDSA;
311: case KEY_ED25519_CERT:
312: return KEY_ED25519;
313: default:
314: return type;
315: }
316: }
317:
318: #ifdef WITH_OPENSSL
319: /* XXX: these are really begging for a table-driven approach */
320: int
321: sshkey_curve_name_to_nid(const char *name)
322: {
323: if (strcmp(name, "nistp256") == 0)
324: return NID_X9_62_prime256v1;
325: else if (strcmp(name, "nistp384") == 0)
326: return NID_secp384r1;
327: else if (strcmp(name, "nistp521") == 0)
328: return NID_secp521r1;
329: else
330: return -1;
331: }
332:
333: u_int
334: sshkey_curve_nid_to_bits(int nid)
335: {
336: switch (nid) {
337: case NID_X9_62_prime256v1:
338: return 256;
339: case NID_secp384r1:
340: return 384;
341: case NID_secp521r1:
342: return 521;
343: default:
344: return 0;
345: }
346: }
347:
348: int
349: sshkey_ecdsa_bits_to_nid(int bits)
350: {
351: switch (bits) {
352: case 256:
353: return NID_X9_62_prime256v1;
354: case 384:
355: return NID_secp384r1;
356: case 521:
357: return NID_secp521r1;
358: default:
359: return -1;
360: }
361: }
362:
363: const char *
364: sshkey_curve_nid_to_name(int nid)
365: {
366: switch (nid) {
367: case NID_X9_62_prime256v1:
368: return "nistp256";
369: case NID_secp384r1:
370: return "nistp384";
371: case NID_secp521r1:
372: return "nistp521";
373: default:
374: return NULL;
375: }
376: }
377:
378: int
379: sshkey_ec_nid_to_hash_alg(int nid)
380: {
381: int kbits = sshkey_curve_nid_to_bits(nid);
382:
383: if (kbits <= 0)
384: return -1;
385:
386: /* RFC5656 section 6.2.1 */
387: if (kbits <= 256)
388: return SSH_DIGEST_SHA256;
389: else if (kbits <= 384)
390: return SSH_DIGEST_SHA384;
391: else
392: return SSH_DIGEST_SHA512;
393: }
394: #endif /* WITH_OPENSSL */
395:
396: static void
397: cert_free(struct sshkey_cert *cert)
398: {
399: u_int i;
400:
401: if (cert == NULL)
402: return;
1.31 mmcc 403: sshbuf_free(cert->certblob);
404: sshbuf_free(cert->critical);
405: sshbuf_free(cert->extensions);
1.29 mmcc 406: free(cert->key_id);
1.1 djm 407: for (i = 0; i < cert->nprincipals; i++)
408: free(cert->principals[i]);
1.29 mmcc 409: free(cert->principals);
1.30 mmcc 410: sshkey_free(cert->signature_key);
1.1 djm 411: explicit_bzero(cert, sizeof(*cert));
412: free(cert);
413: }
414:
415: static struct sshkey_cert *
416: cert_new(void)
417: {
418: struct sshkey_cert *cert;
419:
420: if ((cert = calloc(1, sizeof(*cert))) == NULL)
421: return NULL;
422: if ((cert->certblob = sshbuf_new()) == NULL ||
423: (cert->critical = sshbuf_new()) == NULL ||
424: (cert->extensions = sshbuf_new()) == NULL) {
425: cert_free(cert);
426: return NULL;
427: }
428: cert->key_id = NULL;
429: cert->principals = NULL;
430: cert->signature_key = NULL;
431: return cert;
432: }
433:
434: struct sshkey *
435: sshkey_new(int type)
436: {
437: struct sshkey *k;
438: #ifdef WITH_OPENSSL
439: RSA *rsa;
440: DSA *dsa;
441: #endif /* WITH_OPENSSL */
442:
443: if ((k = calloc(1, sizeof(*k))) == NULL)
444: return NULL;
445: k->type = type;
446: k->ecdsa = NULL;
447: k->ecdsa_nid = -1;
448: k->dsa = NULL;
449: k->rsa = NULL;
450: k->cert = NULL;
451: k->ed25519_sk = NULL;
452: k->ed25519_pk = NULL;
453: switch (k->type) {
454: #ifdef WITH_OPENSSL
455: case KEY_RSA1:
456: case KEY_RSA:
457: case KEY_RSA_CERT:
458: if ((rsa = RSA_new()) == NULL ||
459: (rsa->n = BN_new()) == NULL ||
460: (rsa->e = BN_new()) == NULL) {
461: if (rsa != NULL)
462: RSA_free(rsa);
463: free(k);
464: return NULL;
465: }
466: k->rsa = rsa;
467: break;
468: case KEY_DSA:
469: case KEY_DSA_CERT:
470: if ((dsa = DSA_new()) == NULL ||
471: (dsa->p = BN_new()) == NULL ||
472: (dsa->q = BN_new()) == NULL ||
473: (dsa->g = BN_new()) == NULL ||
474: (dsa->pub_key = BN_new()) == NULL) {
475: if (dsa != NULL)
476: DSA_free(dsa);
477: free(k);
478: return NULL;
479: }
480: k->dsa = dsa;
481: break;
482: case KEY_ECDSA:
483: case KEY_ECDSA_CERT:
484: /* Cannot do anything until we know the group */
485: break;
486: #endif /* WITH_OPENSSL */
487: case KEY_ED25519:
488: case KEY_ED25519_CERT:
489: /* no need to prealloc */
490: break;
491: case KEY_UNSPEC:
492: break;
493: default:
494: free(k);
495: return NULL;
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:
1169: /* returns 0 ok, and < 0 error */
1170: int
1171: sshkey_read(struct sshkey *ret, char **cpp)
1172: {
1173: struct sshkey *k;
1174: int retval = SSH_ERR_INVALID_FORMAT;
1.25 djm 1175: char *ep, *cp, *space;
1.1 djm 1176: int r, type, curve_nid = -1;
1177: struct sshbuf *blob;
1.44 dtucker 1178:
1179: if (ret == NULL)
1180: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1181:
1182: cp = *cpp;
1183:
1184: switch (ret->type) {
1185: case KEY_RSA1:
1186: break;
1187: case KEY_UNSPEC:
1188: case KEY_RSA:
1189: case KEY_DSA:
1190: case KEY_ECDSA:
1191: case KEY_ED25519:
1192: case KEY_DSA_CERT:
1193: case KEY_ECDSA_CERT:
1194: case KEY_RSA_CERT:
1195: case KEY_ED25519_CERT:
1196: space = strchr(cp, ' ');
1197: if (space == NULL)
1198: return SSH_ERR_INVALID_FORMAT;
1199: *space = '\0';
1200: type = sshkey_type_from_name(cp);
1201: if (sshkey_type_plain(type) == KEY_ECDSA &&
1202: (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1203: return SSH_ERR_EC_CURVE_INVALID;
1204: *space = ' ';
1205: if (type == KEY_UNSPEC)
1206: return SSH_ERR_INVALID_FORMAT;
1207: cp = space+1;
1208: if (*cp == '\0')
1209: return SSH_ERR_INVALID_FORMAT;
1.5 djm 1210: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1211: return SSH_ERR_KEY_TYPE_MISMATCH;
1212: if ((blob = sshbuf_new()) == NULL)
1213: return SSH_ERR_ALLOC_FAIL;
1214: /* trim comment */
1215: space = strchr(cp, ' ');
1.10 markus 1216: if (space) {
1217: /* advance 'space': skip whitespace */
1218: *space++ = '\0';
1219: while (*space == ' ' || *space == '\t')
1220: space++;
1.25 djm 1221: ep = space;
1.10 markus 1222: } else
1.25 djm 1223: ep = cp + strlen(cp);
1.1 djm 1224: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1225: sshbuf_free(blob);
1226: return r;
1227: }
1228: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1229: sshbuf_len(blob), &k)) != 0) {
1230: sshbuf_free(blob);
1231: return r;
1232: }
1233: sshbuf_free(blob);
1234: if (k->type != type) {
1235: sshkey_free(k);
1236: return SSH_ERR_KEY_TYPE_MISMATCH;
1237: }
1238: if (sshkey_type_plain(type) == KEY_ECDSA &&
1239: curve_nid != k->ecdsa_nid) {
1240: sshkey_free(k);
1241: return SSH_ERR_EC_CURVE_MISMATCH;
1242: }
1.5 djm 1243: ret->type = type;
1.1 djm 1244: if (sshkey_is_cert(ret)) {
1245: if (!sshkey_is_cert(k)) {
1246: sshkey_free(k);
1247: return SSH_ERR_EXPECTED_CERT;
1248: }
1249: if (ret->cert != NULL)
1250: cert_free(ret->cert);
1251: ret->cert = k->cert;
1252: k->cert = NULL;
1253: }
1.25 djm 1254: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1255: #ifdef WITH_OPENSSL
1.25 djm 1256: case KEY_RSA:
1.1 djm 1257: if (ret->rsa != NULL)
1258: RSA_free(ret->rsa);
1259: ret->rsa = k->rsa;
1260: k->rsa = NULL;
1261: #ifdef DEBUG_PK
1262: RSA_print_fp(stderr, ret->rsa, 8);
1263: #endif
1.25 djm 1264: break;
1265: case KEY_DSA:
1.1 djm 1266: if (ret->dsa != NULL)
1267: DSA_free(ret->dsa);
1268: ret->dsa = k->dsa;
1269: k->dsa = NULL;
1270: #ifdef DEBUG_PK
1271: DSA_print_fp(stderr, ret->dsa, 8);
1272: #endif
1.25 djm 1273: break;
1274: case KEY_ECDSA:
1.1 djm 1275: if (ret->ecdsa != NULL)
1276: EC_KEY_free(ret->ecdsa);
1277: ret->ecdsa = k->ecdsa;
1278: ret->ecdsa_nid = k->ecdsa_nid;
1279: k->ecdsa = NULL;
1280: k->ecdsa_nid = -1;
1281: #ifdef DEBUG_PK
1282: sshkey_dump_ec_key(ret->ecdsa);
1283: #endif
1.25 djm 1284: break;
1.1 djm 1285: #endif /* WITH_OPENSSL */
1.25 djm 1286: case KEY_ED25519:
1.1 djm 1287: free(ret->ed25519_pk);
1288: ret->ed25519_pk = k->ed25519_pk;
1289: k->ed25519_pk = NULL;
1290: #ifdef DEBUG_PK
1291: /* XXX */
1292: #endif
1.25 djm 1293: break;
1.1 djm 1294: }
1.25 djm 1295: *cpp = ep;
1.1 djm 1296: retval = 0;
1297: /*XXXX*/
1298: sshkey_free(k);
1299: if (retval != 0)
1300: break;
1301: break;
1302: default:
1303: return SSH_ERR_INVALID_ARGUMENT;
1304: }
1305: return retval;
1306: }
1307:
1308: int
1.19 djm 1309: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1310: {
1.19 djm 1311: int r = SSH_ERR_INTERNAL_ERROR;
1312: struct sshbuf *b = NULL;
1.1 djm 1313: char *uu = NULL;
1.19 djm 1314:
1315: if (b64p != NULL)
1316: *b64p = NULL;
1317: if ((b = sshbuf_new()) == NULL)
1318: return SSH_ERR_ALLOC_FAIL;
1319: if ((r = sshkey_putb(key, b)) != 0)
1320: goto out;
1321: if ((uu = sshbuf_dtob64(b)) == NULL) {
1322: r = SSH_ERR_ALLOC_FAIL;
1323: goto out;
1324: }
1325: /* Success */
1326: if (b64p != NULL) {
1327: *b64p = uu;
1328: uu = NULL;
1329: }
1330: r = 0;
1331: out:
1332: sshbuf_free(b);
1333: free(uu);
1334: return r;
1335: }
1336:
1337: static int
1338: sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
1339: {
1340: int r = SSH_ERR_INTERNAL_ERROR;
1341:
1342: return r;
1343: }
1344:
1345: static int
1346: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1347: {
1348: int r = SSH_ERR_INTERNAL_ERROR;
1349: char *uu = NULL;
1350:
1351: if (key->type == KEY_RSA1) {
1352: if ((r = sshkey_format_rsa1(key, b)) != 0)
1.1 djm 1353: goto out;
1.19 djm 1354: } else {
1355: /* Unsupported key types handled in sshkey_to_base64() */
1356: if ((r = sshkey_to_base64(key, &uu)) != 0)
1.1 djm 1357: goto out;
1.19 djm 1358: if ((r = sshbuf_putf(b, "%s %s",
1359: sshkey_ssh_name(key), uu)) != 0)
1.1 djm 1360: goto out;
1.19 djm 1361: }
1362: r = 0;
1363: out:
1364: free(uu);
1365: return r;
1366: }
1367:
1368: int
1369: sshkey_write(const struct sshkey *key, FILE *f)
1370: {
1371: struct sshbuf *b = NULL;
1372: int r = SSH_ERR_INTERNAL_ERROR;
1373:
1374: if ((b = sshbuf_new()) == NULL)
1375: return SSH_ERR_ALLOC_FAIL;
1376: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1377: goto out;
1378: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1379: if (feof(f))
1380: errno = EPIPE;
1.19 djm 1381: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1382: goto out;
1383: }
1.19 djm 1384: /* Success */
1385: r = 0;
1.1 djm 1386: out:
1.19 djm 1387: sshbuf_free(b);
1388: return r;
1.1 djm 1389: }
1390:
1391: const char *
1392: sshkey_cert_type(const struct sshkey *k)
1393: {
1394: switch (k->cert->type) {
1395: case SSH2_CERT_TYPE_USER:
1396: return "user";
1397: case SSH2_CERT_TYPE_HOST:
1398: return "host";
1399: default:
1400: return "unknown";
1401: }
1402: }
1403:
1404: #ifdef WITH_OPENSSL
1405: static int
1406: rsa_generate_private_key(u_int bits, RSA **rsap)
1407: {
1408: RSA *private = NULL;
1409: BIGNUM *f4 = NULL;
1410: int ret = SSH_ERR_INTERNAL_ERROR;
1411:
1412: if (rsap == NULL ||
1413: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1414: bits > SSHBUF_MAX_BIGNUM * 8)
1415: return SSH_ERR_INVALID_ARGUMENT;
1416: *rsap = NULL;
1417: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1418: ret = SSH_ERR_ALLOC_FAIL;
1419: goto out;
1420: }
1421: if (!BN_set_word(f4, RSA_F4) ||
1422: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1423: ret = SSH_ERR_LIBCRYPTO_ERROR;
1424: goto out;
1425: }
1426: *rsap = private;
1427: private = NULL;
1428: ret = 0;
1429: out:
1430: if (private != NULL)
1431: RSA_free(private);
1432: if (f4 != NULL)
1433: BN_free(f4);
1434: return ret;
1435: }
1436:
1437: static int
1438: dsa_generate_private_key(u_int bits, DSA **dsap)
1439: {
1440: DSA *private;
1441: int ret = SSH_ERR_INTERNAL_ERROR;
1442:
1443: if (dsap == NULL || bits != 1024)
1444: return SSH_ERR_INVALID_ARGUMENT;
1445: if ((private = DSA_new()) == NULL) {
1446: ret = SSH_ERR_ALLOC_FAIL;
1447: goto out;
1448: }
1449: *dsap = NULL;
1450: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1451: NULL, NULL) || !DSA_generate_key(private)) {
1452: ret = SSH_ERR_LIBCRYPTO_ERROR;
1453: goto out;
1454: }
1455: *dsap = private;
1456: private = NULL;
1457: ret = 0;
1458: out:
1459: if (private != NULL)
1460: DSA_free(private);
1461: return ret;
1462: }
1463:
1464: int
1465: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1466: {
1467: EC_GROUP *eg;
1468: int nids[] = {
1469: NID_X9_62_prime256v1,
1470: NID_secp384r1,
1471: NID_secp521r1,
1472: -1
1473: };
1474: int nid;
1475: u_int i;
1476: BN_CTX *bnctx;
1477: const EC_GROUP *g = EC_KEY_get0_group(k);
1478:
1479: /*
1480: * The group may be stored in a ASN.1 encoded private key in one of two
1481: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1482: * or explicit group parameters encoded into the key blob. Only the
1483: * "named group" case sets the group NID for us, but we can figure
1484: * it out for the other case by comparing against all the groups that
1485: * are supported.
1486: */
1487: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1488: return nid;
1489: if ((bnctx = BN_CTX_new()) == NULL)
1490: return -1;
1491: for (i = 0; nids[i] != -1; i++) {
1492: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1493: BN_CTX_free(bnctx);
1494: return -1;
1495: }
1496: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1497: break;
1498: EC_GROUP_free(eg);
1499: }
1500: BN_CTX_free(bnctx);
1501: if (nids[i] != -1) {
1502: /* Use the group with the NID attached */
1503: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1504: if (EC_KEY_set_group(k, eg) != 1) {
1505: EC_GROUP_free(eg);
1506: return -1;
1507: }
1508: }
1509: return nids[i];
1510: }
1511:
1512: static int
1513: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1514: {
1515: EC_KEY *private;
1516: int ret = SSH_ERR_INTERNAL_ERROR;
1517:
1518: if (nid == NULL || ecdsap == NULL ||
1519: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1520: return SSH_ERR_INVALID_ARGUMENT;
1521: *ecdsap = NULL;
1522: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1523: ret = SSH_ERR_ALLOC_FAIL;
1524: goto out;
1525: }
1526: if (EC_KEY_generate_key(private) != 1) {
1527: ret = SSH_ERR_LIBCRYPTO_ERROR;
1528: goto out;
1529: }
1530: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1531: *ecdsap = private;
1532: private = NULL;
1533: ret = 0;
1534: out:
1535: if (private != NULL)
1536: EC_KEY_free(private);
1537: return ret;
1538: }
1539: #endif /* WITH_OPENSSL */
1540:
1541: int
1542: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1543: {
1544: struct sshkey *k;
1545: int ret = SSH_ERR_INTERNAL_ERROR;
1546:
1547: if (keyp == NULL)
1548: return SSH_ERR_INVALID_ARGUMENT;
1549: *keyp = NULL;
1550: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1551: return SSH_ERR_ALLOC_FAIL;
1552: switch (type) {
1553: case KEY_ED25519:
1554: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1555: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1556: ret = SSH_ERR_ALLOC_FAIL;
1557: break;
1558: }
1559: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1560: ret = 0;
1561: break;
1562: #ifdef WITH_OPENSSL
1563: case KEY_DSA:
1564: ret = dsa_generate_private_key(bits, &k->dsa);
1565: break;
1566: case KEY_ECDSA:
1567: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1568: &k->ecdsa);
1569: break;
1570: case KEY_RSA:
1571: case KEY_RSA1:
1572: ret = rsa_generate_private_key(bits, &k->rsa);
1573: break;
1574: #endif /* WITH_OPENSSL */
1575: default:
1576: ret = SSH_ERR_INVALID_ARGUMENT;
1577: }
1578: if (ret == 0) {
1579: k->type = type;
1580: *keyp = k;
1581: } else
1582: sshkey_free(k);
1583: return ret;
1584: }
1585:
1586: int
1587: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1588: {
1589: u_int i;
1590: const struct sshkey_cert *from;
1591: struct sshkey_cert *to;
1592: int ret = SSH_ERR_INTERNAL_ERROR;
1593:
1594: if (to_key->cert != NULL) {
1595: cert_free(to_key->cert);
1596: to_key->cert = NULL;
1597: }
1598:
1599: if ((from = from_key->cert) == NULL)
1600: return SSH_ERR_INVALID_ARGUMENT;
1601:
1602: if ((to = to_key->cert = cert_new()) == NULL)
1603: return SSH_ERR_ALLOC_FAIL;
1604:
1605: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1606: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1.22 jsg 1607: (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
1.1 djm 1608: return ret;
1609:
1610: to->serial = from->serial;
1611: to->type = from->type;
1612: if (from->key_id == NULL)
1613: to->key_id = NULL;
1614: else if ((to->key_id = strdup(from->key_id)) == NULL)
1615: return SSH_ERR_ALLOC_FAIL;
1616: to->valid_after = from->valid_after;
1617: to->valid_before = from->valid_before;
1618: if (from->signature_key == NULL)
1619: to->signature_key = NULL;
1620: else if ((ret = sshkey_from_private(from->signature_key,
1621: &to->signature_key)) != 0)
1622: return ret;
1623:
1624: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1625: return SSH_ERR_INVALID_ARGUMENT;
1626: if (from->nprincipals > 0) {
1627: if ((to->principals = calloc(from->nprincipals,
1628: sizeof(*to->principals))) == NULL)
1629: return SSH_ERR_ALLOC_FAIL;
1630: for (i = 0; i < from->nprincipals; i++) {
1631: to->principals[i] = strdup(from->principals[i]);
1632: if (to->principals[i] == NULL) {
1633: to->nprincipals = i;
1634: return SSH_ERR_ALLOC_FAIL;
1635: }
1636: }
1637: }
1638: to->nprincipals = from->nprincipals;
1639: return 0;
1640: }
1641:
1642: int
1643: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1644: {
1645: struct sshkey *n = NULL;
1646: int ret = SSH_ERR_INTERNAL_ERROR;
1647:
1.24 djm 1648: *pkp = NULL;
1.1 djm 1649: switch (k->type) {
1650: #ifdef WITH_OPENSSL
1651: case KEY_DSA:
1652: case KEY_DSA_CERT:
1653: if ((n = sshkey_new(k->type)) == NULL)
1654: return SSH_ERR_ALLOC_FAIL;
1655: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1656: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1657: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1658: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1659: sshkey_free(n);
1660: return SSH_ERR_ALLOC_FAIL;
1661: }
1662: break;
1663: case KEY_ECDSA:
1664: case KEY_ECDSA_CERT:
1665: if ((n = sshkey_new(k->type)) == NULL)
1666: return SSH_ERR_ALLOC_FAIL;
1667: n->ecdsa_nid = k->ecdsa_nid;
1668: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1669: if (n->ecdsa == NULL) {
1670: sshkey_free(n);
1671: return SSH_ERR_ALLOC_FAIL;
1672: }
1673: if (EC_KEY_set_public_key(n->ecdsa,
1674: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1675: sshkey_free(n);
1676: return SSH_ERR_LIBCRYPTO_ERROR;
1677: }
1678: break;
1679: case KEY_RSA:
1680: case KEY_RSA1:
1681: case KEY_RSA_CERT:
1682: if ((n = sshkey_new(k->type)) == NULL)
1683: return SSH_ERR_ALLOC_FAIL;
1684: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1685: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1686: sshkey_free(n);
1687: return SSH_ERR_ALLOC_FAIL;
1688: }
1689: break;
1690: #endif /* WITH_OPENSSL */
1691: case KEY_ED25519:
1692: case KEY_ED25519_CERT:
1693: if ((n = sshkey_new(k->type)) == NULL)
1694: return SSH_ERR_ALLOC_FAIL;
1695: if (k->ed25519_pk != NULL) {
1696: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1697: sshkey_free(n);
1698: return SSH_ERR_ALLOC_FAIL;
1699: }
1700: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1701: }
1702: break;
1703: default:
1704: return SSH_ERR_KEY_TYPE_UNKNOWN;
1705: }
1706: if (sshkey_is_cert(k)) {
1707: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1708: sshkey_free(n);
1709: return ret;
1710: }
1711: }
1712: *pkp = n;
1713: return 0;
1714: }
1715:
1716: static int
1.14 djm 1717: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1718: {
1.14 djm 1719: struct sshbuf *principals = NULL, *crit = NULL;
1720: struct sshbuf *exts = NULL, *ca = NULL;
1721: u_char *sig = NULL;
1722: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1723: int ret = SSH_ERR_INTERNAL_ERROR;
1724:
1725: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1726: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1727: return ret;
1728:
1.20 djm 1729: /* Parse body of certificate up to signature */
1730: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1731: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1732: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1733: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1734: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1735: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1736: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1737: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1738: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1739: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1740: /* XXX debug print error for ret */
1741: ret = SSH_ERR_INVALID_FORMAT;
1742: goto out;
1743: }
1744:
1745: /* Signature is left in the buffer so we can calculate this length */
1746: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1747:
1748: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1749: ret = SSH_ERR_INVALID_FORMAT;
1750: goto out;
1751: }
1752:
1753: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1754: key->cert->type != SSH2_CERT_TYPE_HOST) {
1755: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1756: goto out;
1757: }
1758:
1.4 djm 1759: /* Parse principals section */
1760: while (sshbuf_len(principals) > 0) {
1761: char *principal = NULL;
1762: char **oprincipals = NULL;
1763:
1.1 djm 1764: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1765: ret = SSH_ERR_INVALID_FORMAT;
1766: goto out;
1767: }
1.4 djm 1768: if ((ret = sshbuf_get_cstring(principals, &principal,
1769: NULL)) != 0) {
1.1 djm 1770: ret = SSH_ERR_INVALID_FORMAT;
1771: goto out;
1772: }
1773: oprincipals = key->cert->principals;
1.20 djm 1774: key->cert->principals = reallocarray(key->cert->principals,
1775: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1.1 djm 1776: if (key->cert->principals == NULL) {
1777: free(principal);
1778: key->cert->principals = oprincipals;
1779: ret = SSH_ERR_ALLOC_FAIL;
1780: goto out;
1781: }
1782: key->cert->principals[key->cert->nprincipals++] = principal;
1783: }
1784:
1.4 djm 1785: /*
1786: * Stash a copies of the critical options and extensions sections
1787: * for later use.
1788: */
1789: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1790: (exts != NULL &&
1791: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1792: goto out;
1793:
1.4 djm 1794: /*
1795: * Validate critical options and extensions sections format.
1796: */
1797: while (sshbuf_len(crit) != 0) {
1798: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1799: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1800: sshbuf_reset(key->cert->critical);
1.1 djm 1801: ret = SSH_ERR_INVALID_FORMAT;
1802: goto out;
1803: }
1804: }
1.4 djm 1805: while (exts != NULL && sshbuf_len(exts) != 0) {
1806: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1807: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1808: sshbuf_reset(key->cert->extensions);
1.1 djm 1809: ret = SSH_ERR_INVALID_FORMAT;
1810: goto out;
1811: }
1812: }
1813:
1.4 djm 1814: /* Parse CA key and check signature */
1.14 djm 1815: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1816: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1817: goto out;
1818: }
1819: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1820: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1821: goto out;
1822: }
1823: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1824: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1825: goto out;
1.4 djm 1826:
1827: /* Success */
1.1 djm 1828: ret = 0;
1829: out:
1.14 djm 1830: sshbuf_free(ca);
1.4 djm 1831: sshbuf_free(crit);
1832: sshbuf_free(exts);
1833: sshbuf_free(principals);
1.1 djm 1834: free(sig);
1835: return ret;
1836: }
1837:
1838: static int
1.14 djm 1839: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1840: int allow_cert)
1.1 djm 1841: {
1.12 djm 1842: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1843: char *ktype = NULL, *curve = NULL;
1844: struct sshkey *key = NULL;
1845: size_t len;
1846: u_char *pk = NULL;
1.14 djm 1847: struct sshbuf *copy;
1.1 djm 1848: #ifdef WITH_OPENSSL
1849: EC_POINT *q = NULL;
1850: #endif /* WITH_OPENSSL */
1851:
1852: #ifdef DEBUG_PK /* XXX */
1.14 djm 1853: sshbuf_dump(b, stderr);
1.1 djm 1854: #endif
1.32 djm 1855: if (keyp != NULL)
1856: *keyp = NULL;
1.14 djm 1857: if ((copy = sshbuf_fromb(b)) == NULL) {
1858: ret = SSH_ERR_ALLOC_FAIL;
1859: goto out;
1860: }
1.1 djm 1861: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1862: ret = SSH_ERR_INVALID_FORMAT;
1863: goto out;
1864: }
1865:
1866: type = sshkey_type_from_name(ktype);
1867: if (!allow_cert && sshkey_type_is_cert(type)) {
1868: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1869: goto out;
1870: }
1871: switch (type) {
1872: #ifdef WITH_OPENSSL
1873: case KEY_RSA_CERT:
1.14 djm 1874: /* Skip nonce */
1.1 djm 1875: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1876: ret = SSH_ERR_INVALID_FORMAT;
1877: goto out;
1878: }
1879: /* FALLTHROUGH */
1880: case KEY_RSA:
1881: if ((key = sshkey_new(type)) == NULL) {
1882: ret = SSH_ERR_ALLOC_FAIL;
1883: goto out;
1884: }
1.16 djm 1885: if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
1886: sshbuf_get_bignum2(b, key->rsa->n) != 0) {
1.1 djm 1887: ret = SSH_ERR_INVALID_FORMAT;
1888: goto out;
1889: }
1890: #ifdef DEBUG_PK
1891: RSA_print_fp(stderr, key->rsa, 8);
1892: #endif
1893: break;
1894: case KEY_DSA_CERT:
1.14 djm 1895: /* Skip nonce */
1.1 djm 1896: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1897: ret = SSH_ERR_INVALID_FORMAT;
1898: goto out;
1899: }
1900: /* FALLTHROUGH */
1901: case KEY_DSA:
1902: if ((key = sshkey_new(type)) == NULL) {
1903: ret = SSH_ERR_ALLOC_FAIL;
1904: goto out;
1905: }
1.16 djm 1906: if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
1907: sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
1908: sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
1909: sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
1.1 djm 1910: ret = SSH_ERR_INVALID_FORMAT;
1911: goto out;
1912: }
1913: #ifdef DEBUG_PK
1914: DSA_print_fp(stderr, key->dsa, 8);
1915: #endif
1916: break;
1917: case KEY_ECDSA_CERT:
1.14 djm 1918: /* Skip nonce */
1.1 djm 1919: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1920: ret = SSH_ERR_INVALID_FORMAT;
1921: goto out;
1922: }
1923: /* FALLTHROUGH */
1924: case KEY_ECDSA:
1925: if ((key = sshkey_new(type)) == NULL) {
1926: ret = SSH_ERR_ALLOC_FAIL;
1927: goto out;
1928: }
1.12 djm 1929: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 1930: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1931: ret = SSH_ERR_INVALID_FORMAT;
1932: goto out;
1933: }
1934: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1935: ret = SSH_ERR_EC_CURVE_MISMATCH;
1936: goto out;
1937: }
1938: if (key->ecdsa != NULL)
1939: EC_KEY_free(key->ecdsa);
1940: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1941: == NULL) {
1942: ret = SSH_ERR_EC_CURVE_INVALID;
1943: goto out;
1944: }
1945: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
1946: ret = SSH_ERR_ALLOC_FAIL;
1947: goto out;
1948: }
1949: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
1950: ret = SSH_ERR_INVALID_FORMAT;
1951: goto out;
1952: }
1953: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1954: q) != 0) {
1955: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1956: goto out;
1957: }
1958: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
1959: /* XXX assume it is a allocation error */
1960: ret = SSH_ERR_ALLOC_FAIL;
1961: goto out;
1962: }
1963: #ifdef DEBUG_PK
1964: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1965: #endif
1966: break;
1967: #endif /* WITH_OPENSSL */
1968: case KEY_ED25519_CERT:
1.14 djm 1969: /* Skip nonce */
1.1 djm 1970: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1971: ret = SSH_ERR_INVALID_FORMAT;
1972: goto out;
1973: }
1974: /* FALLTHROUGH */
1975: case KEY_ED25519:
1976: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
1977: goto out;
1978: if (len != ED25519_PK_SZ) {
1979: ret = SSH_ERR_INVALID_FORMAT;
1980: goto out;
1981: }
1982: if ((key = sshkey_new(type)) == NULL) {
1983: ret = SSH_ERR_ALLOC_FAIL;
1984: goto out;
1985: }
1986: key->ed25519_pk = pk;
1987: pk = NULL;
1988: break;
1989: case KEY_UNSPEC:
1990: if ((key = sshkey_new(type)) == NULL) {
1991: ret = SSH_ERR_ALLOC_FAIL;
1992: goto out;
1993: }
1994: break;
1995: default:
1996: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1997: goto out;
1998: }
1999:
2000: /* Parse certificate potion */
1.14 djm 2001: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2002: goto out;
2003:
2004: if (key != NULL && sshbuf_len(b) != 0) {
2005: ret = SSH_ERR_INVALID_FORMAT;
2006: goto out;
2007: }
2008: ret = 0;
1.32 djm 2009: if (keyp != NULL) {
2010: *keyp = key;
2011: key = NULL;
2012: }
1.1 djm 2013: out:
1.14 djm 2014: sshbuf_free(copy);
1.1 djm 2015: sshkey_free(key);
2016: free(ktype);
2017: free(curve);
2018: free(pk);
2019: #ifdef WITH_OPENSSL
2020: if (q != NULL)
2021: EC_POINT_free(q);
2022: #endif /* WITH_OPENSSL */
2023: return ret;
2024: }
2025:
2026: int
2027: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2028: {
1.14 djm 2029: struct sshbuf *b;
2030: int r;
2031:
2032: if ((b = sshbuf_from(blob, blen)) == NULL)
2033: return SSH_ERR_ALLOC_FAIL;
2034: r = sshkey_from_blob_internal(b, keyp, 1);
2035: sshbuf_free(b);
2036: return r;
2037: }
2038:
2039: int
2040: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2041: {
2042: return sshkey_from_blob_internal(b, keyp, 1);
2043: }
2044:
2045: int
2046: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2047: {
2048: struct sshbuf *b;
2049: int r;
2050:
2051: if ((r = sshbuf_froms(buf, &b)) != 0)
2052: return r;
2053: r = sshkey_from_blob_internal(b, keyp, 1);
2054: sshbuf_free(b);
2055: return r;
1.1 djm 2056: }
2057:
2058: int
2059: sshkey_sign(const struct sshkey *key,
2060: u_char **sigp, size_t *lenp,
1.28 markus 2061: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2062: {
2063: if (sigp != NULL)
2064: *sigp = NULL;
2065: if (lenp != NULL)
2066: *lenp = 0;
2067: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2068: return SSH_ERR_INVALID_ARGUMENT;
2069: switch (key->type) {
2070: #ifdef WITH_OPENSSL
2071: case KEY_DSA_CERT:
2072: case KEY_DSA:
2073: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2074: case KEY_ECDSA_CERT:
2075: case KEY_ECDSA:
2076: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2077: case KEY_RSA_CERT:
2078: case KEY_RSA:
1.28 markus 2079: return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
1.1 djm 2080: #endif /* WITH_OPENSSL */
2081: case KEY_ED25519:
2082: case KEY_ED25519_CERT:
2083: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2084: default:
2085: return SSH_ERR_KEY_TYPE_UNKNOWN;
2086: }
2087: }
2088:
2089: /*
2090: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2091: */
2092: int
2093: sshkey_verify(const struct sshkey *key,
2094: const u_char *sig, size_t siglen,
2095: const u_char *data, size_t dlen, u_int compat)
2096: {
1.6 djm 2097: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2098: return SSH_ERR_INVALID_ARGUMENT;
2099: switch (key->type) {
2100: #ifdef WITH_OPENSSL
2101: case KEY_DSA_CERT:
2102: case KEY_DSA:
2103: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2104: case KEY_ECDSA_CERT:
2105: case KEY_ECDSA:
2106: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2107: case KEY_RSA_CERT:
2108: case KEY_RSA:
1.28 markus 2109: return ssh_rsa_verify(key, sig, siglen, data, dlen);
1.1 djm 2110: #endif /* WITH_OPENSSL */
2111: case KEY_ED25519:
2112: case KEY_ED25519_CERT:
2113: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2114: default:
2115: return SSH_ERR_KEY_TYPE_UNKNOWN;
2116: }
2117: }
2118:
2119: /* Converts a private to a public key */
2120: int
2121: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2122: {
2123: struct sshkey *pk;
2124: int ret = SSH_ERR_INTERNAL_ERROR;
2125:
1.24 djm 2126: *dkp = NULL;
1.1 djm 2127: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2128: return SSH_ERR_ALLOC_FAIL;
2129: pk->type = k->type;
2130: pk->flags = k->flags;
2131: pk->ecdsa_nid = k->ecdsa_nid;
2132: pk->dsa = NULL;
2133: pk->ecdsa = NULL;
2134: pk->rsa = NULL;
2135: pk->ed25519_pk = NULL;
2136: pk->ed25519_sk = NULL;
2137:
2138: switch (k->type) {
2139: #ifdef WITH_OPENSSL
2140: case KEY_RSA_CERT:
2141: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2142: goto fail;
2143: /* FALLTHROUGH */
2144: case KEY_RSA1:
2145: case KEY_RSA:
2146: if ((pk->rsa = RSA_new()) == NULL ||
2147: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2148: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2149: ret = SSH_ERR_ALLOC_FAIL;
2150: goto fail;
2151: }
2152: break;
2153: case KEY_DSA_CERT:
2154: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2155: goto fail;
2156: /* FALLTHROUGH */
2157: case KEY_DSA:
2158: if ((pk->dsa = DSA_new()) == NULL ||
2159: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2160: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2161: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2162: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2163: ret = SSH_ERR_ALLOC_FAIL;
2164: goto fail;
2165: }
2166: break;
2167: case KEY_ECDSA_CERT:
2168: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2169: goto fail;
2170: /* FALLTHROUGH */
2171: case KEY_ECDSA:
2172: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2173: if (pk->ecdsa == NULL) {
2174: ret = SSH_ERR_ALLOC_FAIL;
2175: goto fail;
2176: }
2177: if (EC_KEY_set_public_key(pk->ecdsa,
2178: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2179: ret = SSH_ERR_LIBCRYPTO_ERROR;
2180: goto fail;
2181: }
2182: break;
2183: #endif /* WITH_OPENSSL */
2184: case KEY_ED25519_CERT:
2185: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2186: goto fail;
2187: /* FALLTHROUGH */
2188: case KEY_ED25519:
2189: if (k->ed25519_pk != NULL) {
2190: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2191: ret = SSH_ERR_ALLOC_FAIL;
2192: goto fail;
2193: }
2194: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2195: }
2196: break;
2197: default:
2198: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2199: fail:
2200: sshkey_free(pk);
2201: return ret;
2202: }
2203: *dkp = pk;
2204: return 0;
2205: }
2206:
2207: /* Convert a plain key to their _CERT equivalent */
2208: int
1.20 djm 2209: sshkey_to_certified(struct sshkey *k)
1.1 djm 2210: {
2211: int newtype;
2212:
2213: switch (k->type) {
2214: #ifdef WITH_OPENSSL
2215: case KEY_RSA:
1.20 djm 2216: newtype = KEY_RSA_CERT;
1.1 djm 2217: break;
2218: case KEY_DSA:
1.20 djm 2219: newtype = KEY_DSA_CERT;
1.1 djm 2220: break;
2221: case KEY_ECDSA:
2222: newtype = KEY_ECDSA_CERT;
2223: break;
2224: #endif /* WITH_OPENSSL */
2225: case KEY_ED25519:
2226: newtype = KEY_ED25519_CERT;
2227: break;
2228: default:
2229: return SSH_ERR_INVALID_ARGUMENT;
2230: }
2231: if ((k->cert = cert_new()) == NULL)
2232: return SSH_ERR_ALLOC_FAIL;
2233: k->type = newtype;
2234: return 0;
2235: }
2236:
2237: /* Convert a certificate to its raw key equivalent */
2238: int
2239: sshkey_drop_cert(struct sshkey *k)
2240: {
2241: if (!sshkey_type_is_cert(k->type))
2242: return SSH_ERR_KEY_TYPE_UNKNOWN;
2243: cert_free(k->cert);
2244: k->cert = NULL;
2245: k->type = sshkey_type_plain(k->type);
2246: return 0;
2247: }
2248:
2249: /* Sign a certified key, (re-)generating the signed certblob. */
2250: int
1.33 djm 2251: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
1.1 djm 2252: {
2253: struct sshbuf *principals = NULL;
2254: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2255: size_t i, ca_len, sig_len;
2256: int ret = SSH_ERR_INTERNAL_ERROR;
2257: struct sshbuf *cert;
2258:
2259: if (k == NULL || k->cert == NULL ||
2260: k->cert->certblob == NULL || ca == NULL)
2261: return SSH_ERR_INVALID_ARGUMENT;
2262: if (!sshkey_is_cert(k))
2263: return SSH_ERR_KEY_TYPE_UNKNOWN;
2264: if (!sshkey_type_is_valid_ca(ca->type))
2265: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2266:
2267: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2268: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2269:
2270: cert = k->cert->certblob; /* for readability */
2271: sshbuf_reset(cert);
2272: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2273: goto out;
2274:
2275: /* -v01 certs put nonce first */
2276: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2277: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2278: goto out;
1.1 djm 2279:
2280: /* XXX this substantially duplicates to_blob(); refactor */
2281: switch (k->type) {
2282: #ifdef WITH_OPENSSL
2283: case KEY_DSA_CERT:
2284: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2285: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2286: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2287: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2288: goto out;
2289: break;
2290: case KEY_ECDSA_CERT:
2291: if ((ret = sshbuf_put_cstring(cert,
2292: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2293: (ret = sshbuf_put_ec(cert,
2294: EC_KEY_get0_public_key(k->ecdsa),
2295: EC_KEY_get0_group(k->ecdsa))) != 0)
2296: goto out;
2297: break;
2298: case KEY_RSA_CERT:
2299: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2300: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2301: goto out;
2302: break;
2303: #endif /* WITH_OPENSSL */
2304: case KEY_ED25519_CERT:
2305: if ((ret = sshbuf_put_string(cert,
2306: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2307: goto out;
2308: break;
2309: default:
2310: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2311: goto out;
1.1 djm 2312: }
2313:
1.20 djm 2314: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2315: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2316: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2317: goto out;
2318:
2319: if ((principals = sshbuf_new()) == NULL) {
2320: ret = SSH_ERR_ALLOC_FAIL;
2321: goto out;
2322: }
2323: for (i = 0; i < k->cert->nprincipals; i++) {
2324: if ((ret = sshbuf_put_cstring(principals,
2325: k->cert->principals[i])) != 0)
2326: goto out;
2327: }
2328: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2329: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2330: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2331: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2332: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2333: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2334: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2335: goto out;
2336:
2337: /* Sign the whole mess */
2338: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.33 djm 2339: sshbuf_len(cert), alg, 0)) != 0)
1.1 djm 2340: goto out;
2341:
2342: /* Append signature and we are done */
2343: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2344: goto out;
2345: ret = 0;
2346: out:
2347: if (ret != 0)
2348: sshbuf_reset(cert);
1.29 mmcc 2349: free(sig_blob);
2350: free(ca_blob);
1.31 mmcc 2351: sshbuf_free(principals);
1.1 djm 2352: return ret;
2353: }
2354:
2355: int
2356: sshkey_cert_check_authority(const struct sshkey *k,
2357: int want_host, int require_principal,
2358: const char *name, const char **reason)
2359: {
2360: u_int i, principal_matches;
2361: time_t now = time(NULL);
2362:
2363: if (reason != NULL)
2364: *reason = NULL;
2365:
2366: if (want_host) {
2367: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2368: *reason = "Certificate invalid: not a host certificate";
2369: return SSH_ERR_KEY_CERT_INVALID;
2370: }
2371: } else {
2372: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2373: *reason = "Certificate invalid: not a user certificate";
2374: return SSH_ERR_KEY_CERT_INVALID;
2375: }
2376: }
2377: if (now < 0) {
2378: /* yikes - system clock before epoch! */
2379: *reason = "Certificate invalid: not yet valid";
2380: return SSH_ERR_KEY_CERT_INVALID;
2381: }
2382: if ((u_int64_t)now < k->cert->valid_after) {
2383: *reason = "Certificate invalid: not yet valid";
2384: return SSH_ERR_KEY_CERT_INVALID;
2385: }
2386: if ((u_int64_t)now >= k->cert->valid_before) {
2387: *reason = "Certificate invalid: expired";
2388: return SSH_ERR_KEY_CERT_INVALID;
2389: }
2390: if (k->cert->nprincipals == 0) {
2391: if (require_principal) {
2392: *reason = "Certificate lacks principal list";
2393: return SSH_ERR_KEY_CERT_INVALID;
2394: }
2395: } else if (name != NULL) {
2396: principal_matches = 0;
2397: for (i = 0; i < k->cert->nprincipals; i++) {
2398: if (strcmp(name, k->cert->principals[i]) == 0) {
2399: principal_matches = 1;
2400: break;
2401: }
2402: }
2403: if (!principal_matches) {
2404: *reason = "Certificate invalid: name is not a listed "
2405: "principal";
2406: return SSH_ERR_KEY_CERT_INVALID;
2407: }
2408: }
2409: return 0;
1.27 djm 2410: }
2411:
2412: size_t
2413: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2414: {
2415: char from[32], to[32], ret[64];
2416: time_t tt;
2417: struct tm *tm;
2418:
2419: *from = *to = '\0';
2420: if (cert->valid_after == 0 &&
2421: cert->valid_before == 0xffffffffffffffffULL)
2422: return strlcpy(s, "forever", l);
2423:
2424: if (cert->valid_after != 0) {
2425: /* XXX revisit INT_MAX in 2038 :) */
2426: tt = cert->valid_after > INT_MAX ?
2427: INT_MAX : cert->valid_after;
2428: tm = localtime(&tt);
2429: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2430: }
2431: if (cert->valid_before != 0xffffffffffffffffULL) {
2432: /* XXX revisit INT_MAX in 2038 :) */
2433: tt = cert->valid_before > INT_MAX ?
2434: INT_MAX : cert->valid_before;
2435: tm = localtime(&tt);
2436: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2437: }
2438:
2439: if (cert->valid_after == 0)
2440: snprintf(ret, sizeof(ret), "before %s", to);
2441: else if (cert->valid_before == 0xffffffffffffffffULL)
2442: snprintf(ret, sizeof(ret), "after %s", from);
2443: else
2444: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2445:
2446: return strlcpy(s, ret, l);
1.1 djm 2447: }
2448:
2449: int
2450: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2451: {
2452: int r = SSH_ERR_INTERNAL_ERROR;
2453:
2454: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2455: goto out;
2456: switch (key->type) {
2457: #ifdef WITH_OPENSSL
2458: case KEY_RSA:
2459: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2460: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2461: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2462: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2463: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2464: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2465: goto out;
2466: break;
2467: case KEY_RSA_CERT:
2468: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2469: r = SSH_ERR_INVALID_ARGUMENT;
2470: goto out;
2471: }
2472: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2473: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2474: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2475: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2476: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2477: goto out;
2478: break;
2479: case KEY_DSA:
2480: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2481: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2482: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2483: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2484: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2485: goto out;
2486: break;
2487: case KEY_DSA_CERT:
2488: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2489: r = SSH_ERR_INVALID_ARGUMENT;
2490: goto out;
2491: }
2492: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2493: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2494: goto out;
2495: break;
2496: case KEY_ECDSA:
2497: if ((r = sshbuf_put_cstring(b,
2498: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2499: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2500: (r = sshbuf_put_bignum2(b,
2501: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2502: goto out;
2503: break;
2504: case KEY_ECDSA_CERT:
2505: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2506: r = SSH_ERR_INVALID_ARGUMENT;
2507: goto out;
2508: }
2509: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2510: (r = sshbuf_put_bignum2(b,
2511: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2512: goto out;
2513: break;
2514: #endif /* WITH_OPENSSL */
2515: case KEY_ED25519:
2516: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2517: ED25519_PK_SZ)) != 0 ||
2518: (r = sshbuf_put_string(b, key->ed25519_sk,
2519: ED25519_SK_SZ)) != 0)
2520: goto out;
2521: break;
2522: case KEY_ED25519_CERT:
2523: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2524: r = SSH_ERR_INVALID_ARGUMENT;
2525: goto out;
2526: }
2527: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2528: (r = sshbuf_put_string(b, key->ed25519_pk,
2529: ED25519_PK_SZ)) != 0 ||
2530: (r = sshbuf_put_string(b, key->ed25519_sk,
2531: ED25519_SK_SZ)) != 0)
2532: goto out;
2533: break;
2534: default:
2535: r = SSH_ERR_INVALID_ARGUMENT;
2536: goto out;
2537: }
2538: /* success */
2539: r = 0;
2540: out:
2541: return r;
2542: }
2543:
2544: int
2545: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2546: {
2547: char *tname = NULL, *curve = NULL;
2548: struct sshkey *k = NULL;
1.14 djm 2549: size_t pklen = 0, sklen = 0;
1.1 djm 2550: int type, r = SSH_ERR_INTERNAL_ERROR;
2551: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2552: #ifdef WITH_OPENSSL
2553: BIGNUM *exponent = NULL;
2554: #endif /* WITH_OPENSSL */
2555:
2556: if (kp != NULL)
2557: *kp = NULL;
2558: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2559: goto out;
2560: type = sshkey_type_from_name(tname);
2561: switch (type) {
2562: #ifdef WITH_OPENSSL
2563: case KEY_DSA:
2564: if ((k = sshkey_new_private(type)) == NULL) {
2565: r = SSH_ERR_ALLOC_FAIL;
2566: goto out;
2567: }
2568: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2569: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2570: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2571: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2572: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2573: goto out;
2574: break;
2575: case KEY_DSA_CERT:
1.14 djm 2576: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2577: (r = sshkey_add_private(k)) != 0 ||
2578: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2579: goto out;
2580: break;
2581: case KEY_ECDSA:
2582: if ((k = sshkey_new_private(type)) == NULL) {
2583: r = SSH_ERR_ALLOC_FAIL;
2584: goto out;
2585: }
2586: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2587: r = SSH_ERR_INVALID_ARGUMENT;
2588: goto out;
2589: }
2590: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2591: goto out;
2592: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2593: r = SSH_ERR_EC_CURVE_MISMATCH;
2594: goto out;
2595: }
2596: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2597: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2598: r = SSH_ERR_LIBCRYPTO_ERROR;
2599: goto out;
2600: }
2601: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2602: (r = sshbuf_get_bignum2(buf, exponent)))
2603: goto out;
2604: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2605: r = SSH_ERR_LIBCRYPTO_ERROR;
2606: goto out;
2607: }
2608: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2609: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2610: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2611: goto out;
2612: break;
2613: case KEY_ECDSA_CERT:
2614: if ((exponent = BN_new()) == NULL) {
2615: r = SSH_ERR_LIBCRYPTO_ERROR;
2616: goto out;
2617: }
1.14 djm 2618: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2619: (r = sshkey_add_private(k)) != 0 ||
2620: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2621: goto out;
2622: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2623: r = SSH_ERR_LIBCRYPTO_ERROR;
2624: goto out;
2625: }
2626: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2627: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2628: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2629: goto out;
2630: break;
2631: case KEY_RSA:
2632: if ((k = sshkey_new_private(type)) == NULL) {
2633: r = SSH_ERR_ALLOC_FAIL;
2634: goto out;
2635: }
2636: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2637: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2638: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2639: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2640: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2641: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2642: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2643: goto out;
2644: break;
2645: case KEY_RSA_CERT:
1.14 djm 2646: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2647: (r = sshkey_add_private(k)) != 0 ||
1.22 jsg 2648: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2649: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2650: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2651: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
1.1 djm 2652: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2653: goto out;
2654: break;
2655: #endif /* WITH_OPENSSL */
2656: case KEY_ED25519:
2657: if ((k = sshkey_new_private(type)) == NULL) {
2658: r = SSH_ERR_ALLOC_FAIL;
2659: goto out;
2660: }
2661: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2662: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2663: goto out;
2664: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2665: r = SSH_ERR_INVALID_FORMAT;
2666: goto out;
2667: }
2668: k->ed25519_pk = ed25519_pk;
2669: k->ed25519_sk = ed25519_sk;
2670: ed25519_pk = ed25519_sk = NULL;
2671: break;
2672: case KEY_ED25519_CERT:
1.14 djm 2673: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2674: (r = sshkey_add_private(k)) != 0 ||
2675: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2676: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2677: goto out;
2678: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2679: r = SSH_ERR_INVALID_FORMAT;
2680: goto out;
2681: }
2682: k->ed25519_pk = ed25519_pk;
2683: k->ed25519_sk = ed25519_sk;
2684: ed25519_pk = ed25519_sk = NULL;
2685: break;
2686: default:
2687: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2688: goto out;
2689: }
2690: #ifdef WITH_OPENSSL
2691: /* enable blinding */
2692: switch (k->type) {
2693: case KEY_RSA:
2694: case KEY_RSA_CERT:
2695: case KEY_RSA1:
2696: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2697: r = SSH_ERR_LIBCRYPTO_ERROR;
2698: goto out;
2699: }
2700: break;
2701: }
2702: #endif /* WITH_OPENSSL */
2703: /* success */
2704: r = 0;
2705: if (kp != NULL) {
2706: *kp = k;
2707: k = NULL;
2708: }
2709: out:
2710: free(tname);
2711: free(curve);
2712: #ifdef WITH_OPENSSL
2713: if (exponent != NULL)
2714: BN_clear_free(exponent);
2715: #endif /* WITH_OPENSSL */
2716: sshkey_free(k);
2717: if (ed25519_pk != NULL) {
2718: explicit_bzero(ed25519_pk, pklen);
2719: free(ed25519_pk);
2720: }
2721: if (ed25519_sk != NULL) {
2722: explicit_bzero(ed25519_sk, sklen);
2723: free(ed25519_sk);
2724: }
2725: return r;
2726: }
2727:
2728: #ifdef WITH_OPENSSL
2729: int
2730: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2731: {
2732: BN_CTX *bnctx;
2733: EC_POINT *nq = NULL;
2734: BIGNUM *order, *x, *y, *tmp;
2735: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 2736:
2737: /*
2738: * NB. This assumes OpenSSL has already verified that the public
2739: * point lies on the curve. This is done by EC_POINT_oct2point()
2740: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
2741: * reachable with public points not unmarshalled using
2742: * EC_POINT_oct2point then the caller will need to explicitly check.
2743: */
1.1 djm 2744:
2745: if ((bnctx = BN_CTX_new()) == NULL)
2746: return SSH_ERR_ALLOC_FAIL;
2747: BN_CTX_start(bnctx);
2748:
2749: /*
2750: * We shouldn't ever hit this case because bignum_get_ecpoint()
2751: * refuses to load GF2m points.
2752: */
2753: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2754: NID_X9_62_prime_field)
2755: goto out;
2756:
2757: /* Q != infinity */
2758: if (EC_POINT_is_at_infinity(group, public))
2759: goto out;
2760:
2761: if ((x = BN_CTX_get(bnctx)) == NULL ||
2762: (y = BN_CTX_get(bnctx)) == NULL ||
2763: (order = BN_CTX_get(bnctx)) == NULL ||
2764: (tmp = BN_CTX_get(bnctx)) == NULL) {
2765: ret = SSH_ERR_ALLOC_FAIL;
2766: goto out;
2767: }
2768:
2769: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2770: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2771: EC_POINT_get_affine_coordinates_GFp(group, public,
2772: x, y, bnctx) != 1) {
2773: ret = SSH_ERR_LIBCRYPTO_ERROR;
2774: goto out;
2775: }
2776: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2777: BN_num_bits(y) <= BN_num_bits(order) / 2)
2778: goto out;
2779:
2780: /* nQ == infinity (n == order of subgroup) */
2781: if ((nq = EC_POINT_new(group)) == NULL) {
2782: ret = SSH_ERR_ALLOC_FAIL;
2783: goto out;
2784: }
2785: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2786: ret = SSH_ERR_LIBCRYPTO_ERROR;
2787: goto out;
2788: }
2789: if (EC_POINT_is_at_infinity(group, nq) != 1)
2790: goto out;
2791:
2792: /* x < order - 1, y < order - 1 */
2793: if (!BN_sub(tmp, order, BN_value_one())) {
2794: ret = SSH_ERR_LIBCRYPTO_ERROR;
2795: goto out;
2796: }
2797: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2798: goto out;
2799: ret = 0;
2800: out:
2801: BN_CTX_free(bnctx);
2802: if (nq != NULL)
2803: EC_POINT_free(nq);
2804: return ret;
2805: }
2806:
2807: int
2808: sshkey_ec_validate_private(const EC_KEY *key)
2809: {
2810: BN_CTX *bnctx;
2811: BIGNUM *order, *tmp;
2812: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2813:
2814: if ((bnctx = BN_CTX_new()) == NULL)
2815: return SSH_ERR_ALLOC_FAIL;
2816: BN_CTX_start(bnctx);
2817:
2818: if ((order = BN_CTX_get(bnctx)) == NULL ||
2819: (tmp = BN_CTX_get(bnctx)) == NULL) {
2820: ret = SSH_ERR_ALLOC_FAIL;
2821: goto out;
2822: }
2823:
2824: /* log2(private) > log2(order)/2 */
2825: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2826: ret = SSH_ERR_LIBCRYPTO_ERROR;
2827: goto out;
2828: }
2829: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2830: BN_num_bits(order) / 2)
2831: goto out;
2832:
2833: /* private < order - 1 */
2834: if (!BN_sub(tmp, order, BN_value_one())) {
2835: ret = SSH_ERR_LIBCRYPTO_ERROR;
2836: goto out;
2837: }
2838: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2839: goto out;
2840: ret = 0;
2841: out:
2842: BN_CTX_free(bnctx);
2843: return ret;
2844: }
2845:
2846: void
2847: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2848: {
2849: BIGNUM *x, *y;
2850: BN_CTX *bnctx;
2851:
2852: if (point == NULL) {
2853: fputs("point=(NULL)\n", stderr);
2854: return;
2855: }
2856: if ((bnctx = BN_CTX_new()) == NULL) {
2857: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2858: return;
2859: }
2860: BN_CTX_start(bnctx);
2861: if ((x = BN_CTX_get(bnctx)) == NULL ||
2862: (y = BN_CTX_get(bnctx)) == NULL) {
2863: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2864: return;
2865: }
2866: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2867: NID_X9_62_prime_field) {
2868: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2869: return;
2870: }
2871: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2872: bnctx) != 1) {
2873: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2874: __func__);
2875: return;
2876: }
2877: fputs("x=", stderr);
2878: BN_print_fp(stderr, x);
2879: fputs("\ny=", stderr);
2880: BN_print_fp(stderr, y);
2881: fputs("\n", stderr);
2882: BN_CTX_free(bnctx);
2883: }
2884:
2885: void
2886: sshkey_dump_ec_key(const EC_KEY *key)
2887: {
2888: const BIGNUM *exponent;
2889:
2890: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2891: EC_KEY_get0_public_key(key));
2892: fputs("exponent=", stderr);
2893: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2894: fputs("(NULL)", stderr);
2895: else
2896: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2897: fputs("\n", stderr);
2898: }
2899: #endif /* WITH_OPENSSL */
2900:
2901: static int
2902: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2903: const char *passphrase, const char *comment, const char *ciphername,
2904: int rounds)
2905: {
1.4 djm 2906: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2907: u_char salt[SALT_LEN];
1.4 djm 2908: char *b64 = NULL;
1.1 djm 2909: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2910: u_int check;
2911: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 2912: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 2913: const struct sshcipher *cipher;
2914: const char *kdfname = KDFNAME;
2915: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2916:
2917: if (rounds <= 0)
2918: rounds = DEFAULT_ROUNDS;
2919: if (passphrase == NULL || !strlen(passphrase)) {
2920: ciphername = "none";
2921: kdfname = "none";
2922: } else if (ciphername == NULL)
2923: ciphername = DEFAULT_CIPHERNAME;
1.47 ! djm 2924: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 2925: r = SSH_ERR_INVALID_ARGUMENT;
2926: goto out;
2927: }
2928:
2929: if ((kdf = sshbuf_new()) == NULL ||
2930: (encoded = sshbuf_new()) == NULL ||
2931: (encrypted = sshbuf_new()) == NULL) {
2932: r = SSH_ERR_ALLOC_FAIL;
2933: goto out;
2934: }
2935: blocksize = cipher_blocksize(cipher);
2936: keylen = cipher_keylen(cipher);
2937: ivlen = cipher_ivlen(cipher);
2938: authlen = cipher_authlen(cipher);
2939: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2940: r = SSH_ERR_ALLOC_FAIL;
2941: goto out;
2942: }
2943: if (strcmp(kdfname, "bcrypt") == 0) {
2944: arc4random_buf(salt, SALT_LEN);
2945: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2946: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2947: r = SSH_ERR_INVALID_ARGUMENT;
2948: goto out;
2949: }
2950: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2951: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2952: goto out;
2953: } else if (strcmp(kdfname, "none") != 0) {
2954: /* Unsupported KDF type */
2955: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2956: goto out;
2957: }
2958: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2959: key + keylen, ivlen, 1)) != 0)
2960: goto out;
2961:
2962: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
2963: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
2964: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
2965: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
2966: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
2967: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
2968: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
2969: goto out;
2970:
2971: /* set up the buffer that will be encrypted */
2972:
2973: /* Random check bytes */
2974: check = arc4random();
2975: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
2976: (r = sshbuf_put_u32(encrypted, check)) != 0)
2977: goto out;
2978:
2979: /* append private key and comment*/
2980: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
2981: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
2982: goto out;
2983:
2984: /* padding */
2985: i = 0;
2986: while (sshbuf_len(encrypted) % blocksize) {
2987: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
2988: goto out;
2989: }
2990:
2991: /* length in destination buffer */
2992: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
2993: goto out;
2994:
2995: /* encrypt */
2996: if ((r = sshbuf_reserve(encoded,
2997: sshbuf_len(encrypted) + authlen, &cp)) != 0)
2998: goto out;
1.36 djm 2999: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3000: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3001: goto out;
3002:
3003: /* uuencode */
3004: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3005: r = SSH_ERR_ALLOC_FAIL;
3006: goto out;
3007: }
3008:
3009: sshbuf_reset(blob);
3010: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3011: goto out;
3012: for (i = 0; i < strlen(b64); i++) {
3013: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3014: goto out;
3015: /* insert line breaks */
3016: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3017: goto out;
3018: }
3019: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3020: goto out;
3021: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3022: goto out;
3023:
3024: /* success */
3025: r = 0;
3026:
3027: out:
3028: sshbuf_free(kdf);
3029: sshbuf_free(encoded);
3030: sshbuf_free(encrypted);
1.36 djm 3031: cipher_free(ciphercontext);
1.1 djm 3032: explicit_bzero(salt, sizeof(salt));
3033: if (key != NULL) {
3034: explicit_bzero(key, keylen + ivlen);
3035: free(key);
3036: }
3037: if (pubkeyblob != NULL) {
3038: explicit_bzero(pubkeyblob, pubkeylen);
3039: free(pubkeyblob);
3040: }
3041: if (b64 != NULL) {
3042: explicit_bzero(b64, strlen(b64));
3043: free(b64);
3044: }
3045: return r;
3046: }
3047:
3048: static int
3049: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3050: struct sshkey **keyp, char **commentp)
3051: {
3052: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3053: const struct sshcipher *cipher = NULL;
3054: const u_char *cp;
3055: int r = SSH_ERR_INTERNAL_ERROR;
3056: size_t encoded_len;
1.18 djm 3057: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3058: struct sshbuf *encoded = NULL, *decoded = NULL;
3059: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3060: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3061: struct sshkey *k = NULL;
3062: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3063: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3064:
3065: if (keyp != NULL)
3066: *keyp = NULL;
3067: if (commentp != NULL)
3068: *commentp = NULL;
3069:
3070: if ((encoded = sshbuf_new()) == NULL ||
3071: (decoded = sshbuf_new()) == NULL ||
3072: (decrypted = sshbuf_new()) == NULL) {
3073: r = SSH_ERR_ALLOC_FAIL;
3074: goto out;
3075: }
3076:
3077: /* check preamble */
3078: cp = sshbuf_ptr(blob);
3079: encoded_len = sshbuf_len(blob);
3080: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3081: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3082: r = SSH_ERR_INVALID_FORMAT;
3083: goto out;
3084: }
3085: cp += MARK_BEGIN_LEN;
3086: encoded_len -= MARK_BEGIN_LEN;
3087:
3088: /* Look for end marker, removing whitespace as we go */
3089: while (encoded_len > 0) {
3090: if (*cp != '\n' && *cp != '\r') {
3091: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3092: goto out;
3093: }
3094: last = *cp;
3095: encoded_len--;
3096: cp++;
3097: if (last == '\n') {
3098: if (encoded_len >= MARK_END_LEN &&
3099: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3100: /* \0 terminate */
3101: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3102: goto out;
3103: break;
3104: }
3105: }
3106: }
3107: if (encoded_len == 0) {
3108: r = SSH_ERR_INVALID_FORMAT;
3109: goto out;
3110: }
3111:
3112: /* decode base64 */
1.4 djm 3113: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3114: goto out;
3115:
3116: /* check magic */
3117: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3118: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3119: r = SSH_ERR_INVALID_FORMAT;
3120: goto out;
3121: }
3122: /* parse public portion of key */
3123: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3124: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3125: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3126: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3127: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3128: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3129: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3130: goto out;
3131:
3132: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3133: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3134: goto out;
3135: }
3136: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3137: strcmp(ciphername, "none") != 0) {
3138: /* passphrase required */
3139: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3140: goto out;
3141: }
3142: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3143: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3144: goto out;
3145: }
3146: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3147: r = SSH_ERR_INVALID_FORMAT;
3148: goto out;
3149: }
3150: if (nkeys != 1) {
3151: /* XXX only one key supported */
3152: r = SSH_ERR_INVALID_FORMAT;
3153: goto out;
3154: }
3155:
3156: /* check size of encrypted key blob */
3157: blocksize = cipher_blocksize(cipher);
3158: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3159: r = SSH_ERR_INVALID_FORMAT;
3160: goto out;
3161: }
3162:
3163: /* setup key */
3164: keylen = cipher_keylen(cipher);
3165: ivlen = cipher_ivlen(cipher);
1.18 djm 3166: authlen = cipher_authlen(cipher);
1.1 djm 3167: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3168: r = SSH_ERR_ALLOC_FAIL;
3169: goto out;
3170: }
3171: if (strcmp(kdfname, "bcrypt") == 0) {
3172: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3173: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3174: goto out;
3175: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3176: key, keylen + ivlen, rounds) < 0) {
3177: r = SSH_ERR_INVALID_FORMAT;
3178: goto out;
3179: }
3180: }
3181:
1.18 djm 3182: /* check that an appropriate amount of auth data is present */
3183: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3184: r = SSH_ERR_INVALID_FORMAT;
3185: goto out;
3186: }
3187:
1.1 djm 3188: /* decrypt private portion of key */
3189: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3190: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3191: key + keylen, ivlen, 0)) != 0)
3192: goto out;
1.36 djm 3193: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3194: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3195: /* an integrity error here indicates an incorrect passphrase */
3196: if (r == SSH_ERR_MAC_INVALID)
3197: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3198: goto out;
3199: }
1.18 djm 3200: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3201: goto out;
3202: /* there should be no trailing data */
3203: if (sshbuf_len(decoded) != 0) {
3204: r = SSH_ERR_INVALID_FORMAT;
3205: goto out;
3206: }
3207:
3208: /* check check bytes */
3209: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3210: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3211: goto out;
3212: if (check1 != check2) {
3213: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3214: goto out;
3215: }
3216:
3217: /* Load the private key and comment */
3218: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3219: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3220: goto out;
3221:
3222: /* Check deterministic padding */
3223: i = 0;
3224: while (sshbuf_len(decrypted)) {
3225: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3226: goto out;
3227: if (pad != (++i & 0xff)) {
3228: r = SSH_ERR_INVALID_FORMAT;
3229: goto out;
3230: }
3231: }
3232:
3233: /* XXX decode pubkey and check against private */
3234:
3235: /* success */
3236: r = 0;
3237: if (keyp != NULL) {
3238: *keyp = k;
3239: k = NULL;
3240: }
3241: if (commentp != NULL) {
3242: *commentp = comment;
3243: comment = NULL;
3244: }
3245: out:
3246: pad = 0;
1.36 djm 3247: cipher_free(ciphercontext);
1.1 djm 3248: free(ciphername);
3249: free(kdfname);
3250: free(comment);
3251: if (salt != NULL) {
3252: explicit_bzero(salt, slen);
3253: free(salt);
3254: }
3255: if (key != NULL) {
3256: explicit_bzero(key, keylen + ivlen);
3257: free(key);
3258: }
3259: sshbuf_free(encoded);
3260: sshbuf_free(decoded);
3261: sshbuf_free(kdf);
3262: sshbuf_free(decrypted);
3263: sshkey_free(k);
3264: return r;
3265: }
3266:
3267:
3268: #ifdef WITH_OPENSSL
3269: /* convert SSH v2 key in OpenSSL PEM format */
3270: static int
3271: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3272: const char *_passphrase, const char *comment)
3273: {
3274: int success, r;
3275: int blen, len = strlen(_passphrase);
3276: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3277: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3278: const u_char *bptr;
3279: BIO *bio = NULL;
3280:
3281: if (len > 0 && len <= 4)
3282: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3283: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3284: return SSH_ERR_ALLOC_FAIL;
3285:
3286: switch (key->type) {
3287: case KEY_DSA:
3288: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3289: cipher, passphrase, len, NULL, NULL);
3290: break;
3291: case KEY_ECDSA:
3292: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3293: cipher, passphrase, len, NULL, NULL);
3294: break;
3295: case KEY_RSA:
3296: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3297: cipher, passphrase, len, NULL, NULL);
3298: break;
3299: default:
3300: success = 0;
3301: break;
3302: }
3303: if (success == 0) {
3304: r = SSH_ERR_LIBCRYPTO_ERROR;
3305: goto out;
3306: }
3307: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3308: r = SSH_ERR_INTERNAL_ERROR;
3309: goto out;
3310: }
3311: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3312: goto out;
3313: r = 0;
3314: out:
3315: BIO_free(bio);
3316: return r;
3317: }
3318: #endif /* WITH_OPENSSL */
3319:
3320: /* Serialise "key" to buffer "blob" */
3321: int
3322: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3323: const char *passphrase, const char *comment,
3324: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3325: {
3326: switch (key->type) {
1.9 markus 3327: #ifdef WITH_OPENSSL
1.1 djm 3328: case KEY_DSA:
3329: case KEY_ECDSA:
3330: case KEY_RSA:
3331: if (force_new_format) {
3332: return sshkey_private_to_blob2(key, blob, passphrase,
3333: comment, new_format_cipher, new_format_rounds);
3334: }
3335: return sshkey_private_pem_to_blob(key, blob,
3336: passphrase, comment);
3337: #endif /* WITH_OPENSSL */
3338: case KEY_ED25519:
3339: return sshkey_private_to_blob2(key, blob, passphrase,
3340: comment, new_format_cipher, new_format_rounds);
3341: default:
3342: return SSH_ERR_KEY_TYPE_UNKNOWN;
3343: }
3344: }
3345:
3346:
3347: #ifdef WITH_OPENSSL
1.8 djm 3348: static int
1.1 djm 3349: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3350: const char *passphrase, struct sshkey **keyp)
1.1 djm 3351: {
3352: EVP_PKEY *pk = NULL;
3353: struct sshkey *prv = NULL;
3354: BIO *bio = NULL;
3355: int r;
3356:
1.32 djm 3357: if (keyp != NULL)
3358: *keyp = NULL;
1.1 djm 3359:
3360: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3361: return SSH_ERR_ALLOC_FAIL;
3362: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3363: (int)sshbuf_len(blob)) {
3364: r = SSH_ERR_ALLOC_FAIL;
3365: goto out;
3366: }
3367:
3368: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3369: (char *)passphrase)) == NULL) {
1.42 djm 3370: unsigned long pem_err = ERR_peek_last_error();
3371: int pem_reason = ERR_GET_REASON(pem_err);
3372:
3373: /*
3374: * Translate OpenSSL error codes to determine whether
3375: * passphrase is required/incorrect.
3376: */
3377: switch (ERR_GET_LIB(pem_err)) {
3378: case ERR_LIB_PEM:
3379: switch (pem_reason) {
3380: case PEM_R_BAD_PASSWORD_READ:
3381: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3382: case PEM_R_BAD_DECRYPT:
3383: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3384: goto out;
3385: default:
3386: r = SSH_ERR_INVALID_FORMAT;
3387: goto out;
3388: }
3389: case ERR_LIB_EVP:
3390: switch (pem_reason) {
3391: case EVP_R_BAD_DECRYPT:
3392: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3393: goto out;
3394: case EVP_R_BN_DECODE_ERROR:
3395: case EVP_R_DECODE_ERROR:
3396: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3397: r = SSH_ERR_INVALID_FORMAT;
3398: goto out;
3399: default:
3400: r = SSH_ERR_LIBCRYPTO_ERROR;
3401: goto out;
3402: }
3403: case ERR_LIB_ASN1:
3404: r = SSH_ERR_INVALID_FORMAT;
3405: goto out;
3406: }
3407: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3408: goto out;
3409: }
3410: if (pk->type == EVP_PKEY_RSA &&
3411: (type == KEY_UNSPEC || type == KEY_RSA)) {
3412: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3413: r = SSH_ERR_ALLOC_FAIL;
3414: goto out;
3415: }
3416: prv->rsa = EVP_PKEY_get1_RSA(pk);
3417: prv->type = KEY_RSA;
3418: #ifdef DEBUG_PK
3419: RSA_print_fp(stderr, prv->rsa, 8);
3420: #endif
3421: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3422: r = SSH_ERR_LIBCRYPTO_ERROR;
3423: goto out;
3424: }
3425: } else if (pk->type == EVP_PKEY_DSA &&
3426: (type == KEY_UNSPEC || type == KEY_DSA)) {
3427: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3428: r = SSH_ERR_ALLOC_FAIL;
3429: goto out;
3430: }
3431: prv->dsa = EVP_PKEY_get1_DSA(pk);
3432: prv->type = KEY_DSA;
3433: #ifdef DEBUG_PK
3434: DSA_print_fp(stderr, prv->dsa, 8);
3435: #endif
3436: } else if (pk->type == EVP_PKEY_EC &&
3437: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3438: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3439: r = SSH_ERR_ALLOC_FAIL;
3440: goto out;
3441: }
3442: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3443: prv->type = KEY_ECDSA;
3444: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3445: if (prv->ecdsa_nid == -1 ||
3446: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3447: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3448: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3449: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3450: r = SSH_ERR_INVALID_FORMAT;
3451: goto out;
3452: }
3453: #ifdef DEBUG_PK
3454: if (prv != NULL && prv->ecdsa != NULL)
3455: sshkey_dump_ec_key(prv->ecdsa);
3456: #endif
3457: } else {
3458: r = SSH_ERR_INVALID_FORMAT;
3459: goto out;
3460: }
3461: r = 0;
1.32 djm 3462: if (keyp != NULL) {
3463: *keyp = prv;
3464: prv = NULL;
3465: }
1.1 djm 3466: out:
3467: BIO_free(bio);
3468: if (pk != NULL)
3469: EVP_PKEY_free(pk);
1.30 mmcc 3470: sshkey_free(prv);
1.1 djm 3471: return r;
3472: }
3473: #endif /* WITH_OPENSSL */
3474:
3475: int
3476: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3477: const char *passphrase, struct sshkey **keyp, char **commentp)
3478: {
1.42 djm 3479: int r = SSH_ERR_INTERNAL_ERROR;
3480:
1.32 djm 3481: if (keyp != NULL)
3482: *keyp = NULL;
1.1 djm 3483: if (commentp != NULL)
3484: *commentp = NULL;
3485:
3486: switch (type) {
1.9 markus 3487: #ifdef WITH_OPENSSL
1.1 djm 3488: case KEY_DSA:
3489: case KEY_ECDSA:
3490: case KEY_RSA:
1.8 djm 3491: return sshkey_parse_private_pem_fileblob(blob, type,
3492: passphrase, keyp);
1.1 djm 3493: #endif /* WITH_OPENSSL */
3494: case KEY_ED25519:
3495: return sshkey_parse_private2(blob, type, passphrase,
3496: keyp, commentp);
3497: case KEY_UNSPEC:
1.42 djm 3498: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3499: commentp);
3500: /* Do not fallback to PEM parser if only passphrase is wrong. */
3501: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
3502: return r;
1.1 djm 3503: #ifdef WITH_OPENSSL
1.8 djm 3504: return sshkey_parse_private_pem_fileblob(blob, type,
3505: passphrase, keyp);
1.1 djm 3506: #else
3507: return SSH_ERR_INVALID_FORMAT;
3508: #endif /* WITH_OPENSSL */
3509: default:
3510: return SSH_ERR_KEY_TYPE_UNKNOWN;
3511: }
3512: }
3513:
3514: int
3515: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3516: struct sshkey **keyp, char **commentp)
1.1 djm 3517: {
3518: if (keyp != NULL)
3519: *keyp = NULL;
3520: if (commentp != NULL)
3521: *commentp = NULL;
3522:
1.23 tim 3523: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3524: passphrase, keyp, commentp);
1.1 djm 3525: }
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