Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.4
1.4 ! djm 1: /* $OpenBSD: sshkey.c,v 1.3 2014/07/03 01:45:38 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/param.h>
29: #include <sys/types.h>
30:
31: #include <openssl/evp.h>
32: #include <openssl/err.h>
33: #include <openssl/pem.h>
34:
35: #include "crypto_api.h"
36:
37: #include <errno.h>
38: #include <stdio.h>
39: #include <string.h>
40: #include <util.h>
41:
42: #include "ssh2.h"
43: #include "ssherr.h"
44: #include "misc.h"
45: #include "sshbuf.h"
46: #include "rsa.h"
47: #include "cipher.h"
48: #include "digest.h"
49: #define SSHKEY_INTERNAL
50: #include "sshkey.h"
51:
52: /* openssh private key file format */
53: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
54: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
55: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
56: #define MARK_END_LEN (sizeof(MARK_END) - 1)
57: #define KDFNAME "bcrypt"
58: #define AUTH_MAGIC "openssh-key-v1"
59: #define SALT_LEN 16
60: #define DEFAULT_CIPHERNAME "aes256-cbc"
61: #define DEFAULT_ROUNDS 16
62:
63: /* Version identification string for SSH v1 identity files. */
64: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
65:
66: static int sshkey_from_blob_internal(const u_char *blob, size_t blen,
67: struct sshkey **keyp, int allow_cert);
68:
69: /* Supported key types */
70: struct keytype {
71: const char *name;
72: const char *shortname;
73: int type;
74: int nid;
75: int cert;
76: };
77: static const struct keytype keytypes[] = {
78: { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
79: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
80: KEY_ED25519_CERT, 0, 1 },
81: #ifdef WITH_OPENSSL
82: { NULL, "RSA1", KEY_RSA1, 0, 0 },
83: { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
84: { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
85: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
86: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
87: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
88: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
89: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
90: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
91: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
92: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
93: KEY_ECDSA_CERT, NID_secp384r1, 1 },
94: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
95: KEY_ECDSA_CERT, NID_secp521r1, 1 },
96: { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
97: KEY_RSA_CERT_V00, 0, 1 },
98: { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
99: KEY_DSA_CERT_V00, 0, 1 },
100: #endif /* WITH_OPENSSL */
101: { NULL, NULL, -1, -1, 0 }
102: };
103:
104: const char *
105: sshkey_type(const struct sshkey *k)
106: {
107: const struct keytype *kt;
108:
109: for (kt = keytypes; kt->type != -1; kt++) {
110: if (kt->type == k->type)
111: return kt->shortname;
112: }
113: return "unknown";
114: }
115:
116: static const char *
117: sshkey_ssh_name_from_type_nid(int type, int nid)
118: {
119: const struct keytype *kt;
120:
121: for (kt = keytypes; kt->type != -1; kt++) {
122: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
123: return kt->name;
124: }
125: return "ssh-unknown";
126: }
127:
128: int
129: sshkey_type_is_cert(int type)
130: {
131: const struct keytype *kt;
132:
133: for (kt = keytypes; kt->type != -1; kt++) {
134: if (kt->type == type)
135: return kt->cert;
136: }
137: return 0;
138: }
139:
140: const char *
141: sshkey_ssh_name(const struct sshkey *k)
142: {
143: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
144: }
145:
146: const char *
147: sshkey_ssh_name_plain(const struct sshkey *k)
148: {
149: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
150: k->ecdsa_nid);
151: }
152:
153: int
154: sshkey_type_from_name(const char *name)
155: {
156: const struct keytype *kt;
157:
158: for (kt = keytypes; kt->type != -1; kt++) {
159: /* Only allow shortname matches for plain key types */
160: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
161: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
162: return kt->type;
163: }
164: return KEY_UNSPEC;
165: }
166:
167: int
168: sshkey_ecdsa_nid_from_name(const char *name)
169: {
170: const struct keytype *kt;
171:
1.4 ! djm 172: for (kt = keytypes; kt->type != -1; kt++) {
! 173: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
! 174: continue;
! 175: if (kt->name != NULL && strcmp(name, kt->name) == 0)
! 176: return kt->nid;
! 177: }
1.1 djm 178: return -1;
179: }
180:
181: char *
182: key_alg_list(int certs_only, int plain_only)
183: {
184: char *tmp, *ret = NULL;
185: size_t nlen, rlen = 0;
186: const struct keytype *kt;
187:
188: for (kt = keytypes; kt->type != -1; kt++) {
189: if (kt->name == NULL)
190: continue;
191: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
192: continue;
193: if (ret != NULL)
194: ret[rlen++] = '\n';
195: nlen = strlen(kt->name);
196: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
197: free(ret);
198: return NULL;
199: }
200: ret = tmp;
201: memcpy(ret + rlen, kt->name, nlen + 1);
202: rlen += nlen;
203: }
204: return ret;
205: }
206:
207: int
208: sshkey_names_valid2(const char *names)
209: {
210: char *s, *cp, *p;
211:
212: if (names == NULL || strcmp(names, "") == 0)
213: return 0;
214: if ((s = cp = strdup(names)) == NULL)
215: return 0;
216: for ((p = strsep(&cp, ",")); p && *p != '\0';
217: (p = strsep(&cp, ","))) {
218: switch (sshkey_type_from_name(p)) {
219: case KEY_RSA1:
220: case KEY_UNSPEC:
221: free(s);
222: return 0;
223: }
224: }
225: free(s);
226: return 1;
227: }
228:
229: u_int
230: sshkey_size(const struct sshkey *k)
231: {
232: switch (k->type) {
233: #ifdef WITH_OPENSSL
234: case KEY_RSA1:
235: case KEY_RSA:
236: case KEY_RSA_CERT_V00:
237: case KEY_RSA_CERT:
238: return BN_num_bits(k->rsa->n);
239: case KEY_DSA:
240: case KEY_DSA_CERT_V00:
241: case KEY_DSA_CERT:
242: return BN_num_bits(k->dsa->p);
243: case KEY_ECDSA:
244: case KEY_ECDSA_CERT:
245: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
246: #endif /* WITH_OPENSSL */
247: case KEY_ED25519:
248: case KEY_ED25519_CERT:
249: return 256; /* XXX */
250: }
251: return 0;
252: }
253:
254: int
255: sshkey_cert_is_legacy(const struct sshkey *k)
256: {
257: switch (k->type) {
258: case KEY_DSA_CERT_V00:
259: case KEY_RSA_CERT_V00:
260: return 1;
261: default:
262: return 0;
263: }
264: }
265:
266: static int
267: sshkey_type_is_valid_ca(int type)
268: {
269: switch (type) {
270: case KEY_RSA:
271: case KEY_DSA:
272: case KEY_ECDSA:
273: case KEY_ED25519:
274: return 1;
275: default:
276: return 0;
277: }
278: }
279:
280: int
281: sshkey_is_cert(const struct sshkey *k)
282: {
283: if (k == NULL)
284: return 0;
285: return sshkey_type_is_cert(k->type);
286: }
287:
288: /* Return the cert-less equivalent to a certified key type */
289: int
290: sshkey_type_plain(int type)
291: {
292: switch (type) {
293: case KEY_RSA_CERT_V00:
294: case KEY_RSA_CERT:
295: return KEY_RSA;
296: case KEY_DSA_CERT_V00:
297: case KEY_DSA_CERT:
298: return KEY_DSA;
299: case KEY_ECDSA_CERT:
300: return KEY_ECDSA;
301: case KEY_ED25519_CERT:
302: return KEY_ED25519;
303: default:
304: return type;
305: }
306: }
307:
308: #ifdef WITH_OPENSSL
309: /* XXX: these are really begging for a table-driven approach */
310: int
311: sshkey_curve_name_to_nid(const char *name)
312: {
313: if (strcmp(name, "nistp256") == 0)
314: return NID_X9_62_prime256v1;
315: else if (strcmp(name, "nistp384") == 0)
316: return NID_secp384r1;
317: else if (strcmp(name, "nistp521") == 0)
318: return NID_secp521r1;
319: else
320: return -1;
321: }
322:
323: u_int
324: sshkey_curve_nid_to_bits(int nid)
325: {
326: switch (nid) {
327: case NID_X9_62_prime256v1:
328: return 256;
329: case NID_secp384r1:
330: return 384;
331: case NID_secp521r1:
332: return 521;
333: default:
334: return 0;
335: }
336: }
337:
338: int
339: sshkey_ecdsa_bits_to_nid(int bits)
340: {
341: switch (bits) {
342: case 256:
343: return NID_X9_62_prime256v1;
344: case 384:
345: return NID_secp384r1;
346: case 521:
347: return NID_secp521r1;
348: default:
349: return -1;
350: }
351: }
352:
353: const char *
354: sshkey_curve_nid_to_name(int nid)
355: {
356: switch (nid) {
357: case NID_X9_62_prime256v1:
358: return "nistp256";
359: case NID_secp384r1:
360: return "nistp384";
361: case NID_secp521r1:
362: return "nistp521";
363: default:
364: return NULL;
365: }
366: }
367:
368: int
369: sshkey_ec_nid_to_hash_alg(int nid)
370: {
371: int kbits = sshkey_curve_nid_to_bits(nid);
372:
373: if (kbits <= 0)
374: return -1;
375:
376: /* RFC5656 section 6.2.1 */
377: if (kbits <= 256)
378: return SSH_DIGEST_SHA256;
379: else if (kbits <= 384)
380: return SSH_DIGEST_SHA384;
381: else
382: return SSH_DIGEST_SHA512;
383: }
384: #endif /* WITH_OPENSSL */
385:
386: static void
387: cert_free(struct sshkey_cert *cert)
388: {
389: u_int i;
390:
391: if (cert == NULL)
392: return;
393: if (cert->certblob != NULL)
394: sshbuf_free(cert->certblob);
395: if (cert->critical != NULL)
396: sshbuf_free(cert->critical);
397: if (cert->extensions != NULL)
398: sshbuf_free(cert->extensions);
399: if (cert->key_id != NULL)
400: free(cert->key_id);
401: for (i = 0; i < cert->nprincipals; i++)
402: free(cert->principals[i]);
403: if (cert->principals != NULL)
404: free(cert->principals);
405: if (cert->signature_key != NULL)
406: sshkey_free(cert->signature_key);
407: explicit_bzero(cert, sizeof(*cert));
408: free(cert);
409: }
410:
411: static struct sshkey_cert *
412: cert_new(void)
413: {
414: struct sshkey_cert *cert;
415:
416: if ((cert = calloc(1, sizeof(*cert))) == NULL)
417: return NULL;
418: if ((cert->certblob = sshbuf_new()) == NULL ||
419: (cert->critical = sshbuf_new()) == NULL ||
420: (cert->extensions = sshbuf_new()) == NULL) {
421: cert_free(cert);
422: return NULL;
423: }
424: cert->key_id = NULL;
425: cert->principals = NULL;
426: cert->signature_key = NULL;
427: return cert;
428: }
429:
430: struct sshkey *
431: sshkey_new(int type)
432: {
433: struct sshkey *k;
434: #ifdef WITH_OPENSSL
435: RSA *rsa;
436: DSA *dsa;
437: #endif /* WITH_OPENSSL */
438:
439: if ((k = calloc(1, sizeof(*k))) == NULL)
440: return NULL;
441: k->type = type;
442: k->ecdsa = NULL;
443: k->ecdsa_nid = -1;
444: k->dsa = NULL;
445: k->rsa = NULL;
446: k->cert = NULL;
447: k->ed25519_sk = NULL;
448: k->ed25519_pk = NULL;
449: switch (k->type) {
450: #ifdef WITH_OPENSSL
451: case KEY_RSA1:
452: case KEY_RSA:
453: case KEY_RSA_CERT_V00:
454: case KEY_RSA_CERT:
455: if ((rsa = RSA_new()) == NULL ||
456: (rsa->n = BN_new()) == NULL ||
457: (rsa->e = BN_new()) == NULL) {
458: if (rsa != NULL)
459: RSA_free(rsa);
460: free(k);
461: return NULL;
462: }
463: k->rsa = rsa;
464: break;
465: case KEY_DSA:
466: case KEY_DSA_CERT_V00:
467: case KEY_DSA_CERT:
468: if ((dsa = DSA_new()) == NULL ||
469: (dsa->p = BN_new()) == NULL ||
470: (dsa->q = BN_new()) == NULL ||
471: (dsa->g = BN_new()) == NULL ||
472: (dsa->pub_key = BN_new()) == NULL) {
473: if (dsa != NULL)
474: DSA_free(dsa);
475: free(k);
476: return NULL;
477: }
478: k->dsa = dsa;
479: break;
480: case KEY_ECDSA:
481: case KEY_ECDSA_CERT:
482: /* Cannot do anything until we know the group */
483: break;
484: #endif /* WITH_OPENSSL */
485: case KEY_ED25519:
486: case KEY_ED25519_CERT:
487: /* no need to prealloc */
488: break;
489: case KEY_UNSPEC:
490: break;
491: default:
492: free(k);
493: return NULL;
494: break;
495: }
496:
497: if (sshkey_is_cert(k)) {
498: if ((k->cert = cert_new()) == NULL) {
499: sshkey_free(k);
500: return NULL;
501: }
502: }
503:
504: return k;
505: }
506:
507: int
508: sshkey_add_private(struct sshkey *k)
509: {
510: switch (k->type) {
511: #ifdef WITH_OPENSSL
512: case KEY_RSA1:
513: case KEY_RSA:
514: case KEY_RSA_CERT_V00:
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_V00:
527: case KEY_DSA_CERT:
528: if (bn_maybe_alloc_failed(k->dsa->priv_key))
529: return SSH_ERR_ALLOC_FAIL;
530: break;
531: #undef bn_maybe_alloc_failed
532: case KEY_ECDSA:
533: case KEY_ECDSA_CERT:
534: /* Cannot do anything until we know the group */
535: break;
536: #endif /* WITH_OPENSSL */
537: case KEY_ED25519:
538: case KEY_ED25519_CERT:
539: /* no need to prealloc */
540: break;
541: case KEY_UNSPEC:
542: break;
543: default:
544: return SSH_ERR_INVALID_ARGUMENT;
545: }
546: return 0;
547: }
548:
549: struct sshkey *
550: sshkey_new_private(int type)
551: {
552: struct sshkey *k = sshkey_new(type);
553:
554: if (k == NULL)
555: return NULL;
556: if (sshkey_add_private(k) != 0) {
557: sshkey_free(k);
558: return NULL;
559: }
560: return k;
561: }
562:
563: void
564: sshkey_free(struct sshkey *k)
565: {
566: if (k == NULL)
567: return;
568: switch (k->type) {
569: #ifdef WITH_OPENSSL
570: case KEY_RSA1:
571: case KEY_RSA:
572: case KEY_RSA_CERT_V00:
573: case KEY_RSA_CERT:
574: if (k->rsa != NULL)
575: RSA_free(k->rsa);
576: k->rsa = NULL;
577: break;
578: case KEY_DSA:
579: case KEY_DSA_CERT_V00:
580: case KEY_DSA_CERT:
581: if (k->dsa != NULL)
582: DSA_free(k->dsa);
583: k->dsa = NULL;
584: break;
585: case KEY_ECDSA:
586: case KEY_ECDSA_CERT:
587: if (k->ecdsa != NULL)
588: EC_KEY_free(k->ecdsa);
589: k->ecdsa = NULL;
590: break;
591: #endif /* WITH_OPENSSL */
592: case KEY_ED25519:
593: case KEY_ED25519_CERT:
594: if (k->ed25519_pk) {
595: explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
596: free(k->ed25519_pk);
597: k->ed25519_pk = NULL;
598: }
599: if (k->ed25519_sk) {
600: explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
601: free(k->ed25519_sk);
602: k->ed25519_sk = NULL;
603: }
604: break;
605: case KEY_UNSPEC:
606: break;
607: default:
608: break;
609: }
610: if (sshkey_is_cert(k))
611: cert_free(k->cert);
612: explicit_bzero(k, sizeof(*k));
613: free(k);
614: }
615:
616: static int
617: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
618: {
619: if (a == NULL && b == NULL)
620: return 1;
621: if (a == NULL || b == NULL)
622: return 0;
623: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
624: return 0;
625: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
626: sshbuf_len(a->certblob)) != 0)
627: return 0;
628: return 1;
629: }
630:
631: /*
632: * Compare public portions of key only, allowing comparisons between
633: * certificates and plain keys too.
634: */
635: int
636: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
637: {
638: #ifdef WITH_OPENSSL
639: BN_CTX *bnctx;
640: #endif /* WITH_OPENSSL */
641:
642: if (a == NULL || b == NULL ||
643: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
644: return 0;
645:
646: switch (a->type) {
647: #ifdef WITH_OPENSSL
648: case KEY_RSA1:
649: case KEY_RSA_CERT_V00:
650: case KEY_RSA_CERT:
651: case KEY_RSA:
652: return a->rsa != NULL && b->rsa != NULL &&
653: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
654: BN_cmp(a->rsa->n, b->rsa->n) == 0;
655: case KEY_DSA_CERT_V00:
656: case KEY_DSA_CERT:
657: case KEY_DSA:
658: return a->dsa != NULL && b->dsa != NULL &&
659: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
660: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
661: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
662: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
663: case KEY_ECDSA_CERT:
664: case KEY_ECDSA:
665: if (a->ecdsa == NULL || b->ecdsa == NULL ||
666: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
667: EC_KEY_get0_public_key(b->ecdsa) == NULL)
668: return 0;
669: if ((bnctx = BN_CTX_new()) == NULL)
670: return 0;
671: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
672: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
673: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
674: EC_KEY_get0_public_key(a->ecdsa),
675: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
676: BN_CTX_free(bnctx);
677: return 0;
678: }
679: BN_CTX_free(bnctx);
680: return 1;
681: #endif /* WITH_OPENSSL */
682: case KEY_ED25519:
683: case KEY_ED25519_CERT:
684: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
685: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
686: default:
687: return 0;
688: }
689: /* NOTREACHED */
690: }
691:
692: int
693: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
694: {
695: if (a == NULL || b == NULL || a->type != b->type)
696: return 0;
697: if (sshkey_is_cert(a)) {
698: if (!cert_compare(a->cert, b->cert))
699: return 0;
700: }
701: return sshkey_equal_public(a, b);
702: }
703:
704: static int
705: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
706: {
707: int type, ret = SSH_ERR_INTERNAL_ERROR;
708: const char *typename;
709:
710: if (key == NULL)
711: return SSH_ERR_INVALID_ARGUMENT;
712:
713: type = force_plain ? sshkey_type_plain(key->type) : key->type;
714: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
715:
716: switch (type) {
717: #ifdef WITH_OPENSSL
718: case KEY_DSA_CERT_V00:
719: case KEY_RSA_CERT_V00:
720: case KEY_DSA_CERT:
721: case KEY_ECDSA_CERT:
722: case KEY_RSA_CERT:
723: #endif /* WITH_OPENSSL */
724: case KEY_ED25519_CERT:
725: /* Use the existing blob */
726: /* XXX modified flag? */
727: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
728: return ret;
729: break;
730: #ifdef WITH_OPENSSL
731: case KEY_DSA:
732: if (key->dsa == NULL)
733: return SSH_ERR_INVALID_ARGUMENT;
734: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
735: (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
736: (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
737: (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
738: (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
739: return ret;
740: break;
741: case KEY_ECDSA:
742: if (key->ecdsa == NULL)
743: return SSH_ERR_INVALID_ARGUMENT;
744: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
745: (ret = sshbuf_put_cstring(b,
746: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
747: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
748: return ret;
749: break;
750: case KEY_RSA:
751: if (key->rsa == NULL)
752: return SSH_ERR_INVALID_ARGUMENT;
753: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
754: (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
755: (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
756: return ret;
757: break;
758: #endif /* WITH_OPENSSL */
759: case KEY_ED25519:
760: if (key->ed25519_pk == NULL)
761: return SSH_ERR_INVALID_ARGUMENT;
762: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
763: (ret = sshbuf_put_string(b,
764: key->ed25519_pk, ED25519_PK_SZ)) != 0)
765: return ret;
766: break;
767: default:
768: return SSH_ERR_KEY_TYPE_UNKNOWN;
769: }
770: return 0;
771: }
772:
773: int
774: sshkey_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
775: {
776: return to_blob_buf(key, b, 0);
777: }
778:
779: int
780: sshkey_plain_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
781: {
782: return to_blob_buf(key, b, 1);
783: }
784:
785: static int
786: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
787: {
788: int ret = SSH_ERR_INTERNAL_ERROR;
789: size_t len;
790: struct sshbuf *b = NULL;
791:
792: if (lenp != NULL)
793: *lenp = 0;
794: if (blobp != NULL)
795: *blobp = NULL;
796: if ((b = sshbuf_new()) == NULL)
797: return SSH_ERR_ALLOC_FAIL;
798: if ((ret = to_blob_buf(key, b, force_plain)) != 0)
799: goto out;
800: len = sshbuf_len(b);
801: if (lenp != NULL)
802: *lenp = len;
803: if (blobp != NULL) {
804: if ((*blobp = malloc(len)) == NULL) {
805: ret = SSH_ERR_ALLOC_FAIL;
806: goto out;
807: }
808: memcpy(*blobp, sshbuf_ptr(b), len);
809: }
810: ret = 0;
811: out:
812: sshbuf_free(b);
813: return ret;
814: }
815:
816: int
817: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
818: {
819: return to_blob(key, blobp, lenp, 0);
820: }
821:
822: int
823: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
824: {
825: return to_blob(key, blobp, lenp, 1);
826: }
827:
828: int
829: sshkey_fingerprint_raw(const struct sshkey *k, enum sshkey_fp_type dgst_type,
830: u_char **retp, size_t *lenp)
831: {
832: u_char *blob = NULL, *ret = NULL;
833: size_t blob_len = 0;
834: int hash_alg = -1, r = SSH_ERR_INTERNAL_ERROR;
835:
836: if (retp != NULL)
837: *retp = NULL;
838: if (lenp != NULL)
839: *lenp = 0;
840:
841: switch (dgst_type) {
842: case SSH_FP_MD5:
843: hash_alg = SSH_DIGEST_MD5;
844: break;
845: case SSH_FP_SHA1:
846: hash_alg = SSH_DIGEST_SHA1;
847: break;
848: case SSH_FP_SHA256:
849: hash_alg = SSH_DIGEST_SHA256;
850: break;
851: default:
852: r = SSH_ERR_INVALID_ARGUMENT;
853: goto out;
854: }
855:
856: if (k->type == KEY_RSA1) {
857: #ifdef WITH_OPENSSL
858: int nlen = BN_num_bytes(k->rsa->n);
859: int elen = BN_num_bytes(k->rsa->e);
860:
861: blob_len = nlen + elen;
862: if (nlen >= INT_MAX - elen ||
863: (blob = malloc(blob_len)) == NULL) {
864: r = SSH_ERR_ALLOC_FAIL;
865: goto out;
866: }
867: BN_bn2bin(k->rsa->n, blob);
868: BN_bn2bin(k->rsa->e, blob + nlen);
869: #endif /* WITH_OPENSSL */
870: } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
871: goto out;
872: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
873: r = SSH_ERR_ALLOC_FAIL;
874: goto out;
875: }
876: if ((r = ssh_digest_memory(hash_alg, blob, blob_len,
877: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
878: goto out;
879: /* success */
880: if (retp != NULL) {
881: *retp = ret;
882: ret = NULL;
883: }
884: if (lenp != NULL)
885: *lenp = ssh_digest_bytes(hash_alg);
886: r = 0;
887: out:
888: free(ret);
889: if (blob != NULL) {
890: explicit_bzero(blob, blob_len);
891: free(blob);
892: }
893: return r;
894: }
895:
896: static char *
897: fingerprint_hex(u_char *dgst_raw, size_t dgst_raw_len)
898: {
899: char *retval;
900: size_t i;
901:
902: if ((retval = calloc(1, dgst_raw_len * 3 + 1)) == NULL)
903: return NULL;
904: for (i = 0; i < dgst_raw_len; i++) {
905: char hex[4];
906: snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
907: strlcat(retval, hex, dgst_raw_len * 3 + 1);
908: }
909:
910: /* Remove the trailing ':' character */
911: retval[(dgst_raw_len * 3) - 1] = '\0';
912: return retval;
913: }
914:
915: static char *
916: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
917: {
918: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
919: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
920: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
921: u_int i, j = 0, rounds, seed = 1;
922: char *retval;
923:
924: rounds = (dgst_raw_len / 2) + 1;
925: if ((retval = calloc(rounds, 6)) == NULL)
926: return NULL;
927: retval[j++] = 'x';
928: for (i = 0; i < rounds; i++) {
929: u_int idx0, idx1, idx2, idx3, idx4;
930: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
931: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
932: seed) % 6;
933: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
934: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
935: (seed / 6)) % 6;
936: retval[j++] = vowels[idx0];
937: retval[j++] = consonants[idx1];
938: retval[j++] = vowels[idx2];
939: if ((i + 1) < rounds) {
940: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
941: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
942: retval[j++] = consonants[idx3];
943: retval[j++] = '-';
944: retval[j++] = consonants[idx4];
945: seed = ((seed * 5) +
946: ((((u_int)(dgst_raw[2 * i])) * 7) +
947: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
948: }
949: } else {
950: idx0 = seed % 6;
951: idx1 = 16;
952: idx2 = seed / 6;
953: retval[j++] = vowels[idx0];
954: retval[j++] = consonants[idx1];
955: retval[j++] = vowels[idx2];
956: }
957: }
958: retval[j++] = 'x';
959: retval[j++] = '\0';
960: return retval;
961: }
962:
963: /*
964: * Draw an ASCII-Art representing the fingerprint so human brain can
965: * profit from its built-in pattern recognition ability.
966: * This technique is called "random art" and can be found in some
967: * scientific publications like this original paper:
968: *
969: * "Hash Visualization: a New Technique to improve Real-World Security",
970: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
971: * Techniques and E-Commerce (CrypTEC '99)
972: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
973: *
974: * The subject came up in a talk by Dan Kaminsky, too.
975: *
976: * If you see the picture is different, the key is different.
977: * If the picture looks the same, you still know nothing.
978: *
979: * The algorithm used here is a worm crawling over a discrete plane,
980: * leaving a trace (augmenting the field) everywhere it goes.
981: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
982: * makes the respective movement vector be ignored for this turn.
983: * Graphs are not unambiguous, because circles in graphs can be
984: * walked in either direction.
985: */
986:
987: /*
988: * Field sizes for the random art. Have to be odd, so the starting point
989: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
990: * Else pictures would be too dense, and drawing the frame would
991: * fail, too, because the key type would not fit in anymore.
992: */
993: #define FLDBASE 8
994: #define FLDSIZE_Y (FLDBASE + 1)
995: #define FLDSIZE_X (FLDBASE * 2 + 1)
996: static char *
997: fingerprint_randomart(u_char *dgst_raw, size_t dgst_raw_len,
998: const struct sshkey *k)
999: {
1000: /*
1001: * Chars to be used after each other every time the worm
1002: * intersects with itself. Matter of taste.
1003: */
1004: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.3 djm 1005: char *retval, *p, title[FLDSIZE_X];
1.1 djm 1006: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.3 djm 1007: size_t i, tlen;
1.1 djm 1008: u_int b;
1.3 djm 1009: int x, y, r;
1.1 djm 1010: size_t len = strlen(augmentation_string) - 1;
1011:
1012: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1013: return NULL;
1014:
1015: /* initialize field */
1016: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1017: x = FLDSIZE_X / 2;
1018: y = FLDSIZE_Y / 2;
1019:
1020: /* process raw key */
1021: for (i = 0; i < dgst_raw_len; i++) {
1022: int input;
1023: /* each byte conveys four 2-bit move commands */
1024: input = dgst_raw[i];
1025: for (b = 0; b < 4; b++) {
1026: /* evaluate 2 bit, rest is shifted later */
1027: x += (input & 0x1) ? 1 : -1;
1028: y += (input & 0x2) ? 1 : -1;
1029:
1030: /* assure we are still in bounds */
1031: x = MAX(x, 0);
1032: y = MAX(y, 0);
1033: x = MIN(x, FLDSIZE_X - 1);
1034: y = MIN(y, FLDSIZE_Y - 1);
1035:
1036: /* augment the field */
1037: if (field[x][y] < len - 2)
1038: field[x][y]++;
1039: input = input >> 2;
1040: }
1041: }
1042:
1043: /* mark starting point and end point*/
1044: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1045: field[x][y] = len;
1046:
1.3 djm 1047: /* assemble title */
1048: r = snprintf(title, sizeof(title), "[%s %u]",
1049: sshkey_type(k), sshkey_size(k));
1050: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1051: if (r < 0 || r > (int)sizeof(title))
1052: snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1053: tlen = strlen(title);
1.1 djm 1054:
1055: /* output upper border */
1.3 djm 1056: p = retval;
1057: *p++ = '+';
1058: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1059: *p++ = '-';
1060: memcpy(p, title, tlen);
1061: p += tlen;
1.1 djm 1062: for (i = p - retval - 1; i < FLDSIZE_X; i++)
1063: *p++ = '-';
1064: *p++ = '+';
1065: *p++ = '\n';
1066:
1067: /* output content */
1068: for (y = 0; y < FLDSIZE_Y; y++) {
1069: *p++ = '|';
1070: for (x = 0; x < FLDSIZE_X; x++)
1071: *p++ = augmentation_string[MIN(field[x][y], len)];
1072: *p++ = '|';
1073: *p++ = '\n';
1074: }
1075:
1076: /* output lower border */
1077: *p++ = '+';
1078: for (i = 0; i < FLDSIZE_X; i++)
1079: *p++ = '-';
1080: *p++ = '+';
1081:
1082: return retval;
1083: }
1084:
1085: char *
1086: sshkey_fingerprint(const struct sshkey *k, enum sshkey_fp_type dgst_type,
1087: enum sshkey_fp_rep dgst_rep)
1088: {
1089: char *retval = NULL;
1090: u_char *dgst_raw;
1091: size_t dgst_raw_len;
1092:
1093: if (sshkey_fingerprint_raw(k, dgst_type, &dgst_raw, &dgst_raw_len) != 0)
1094: return NULL;
1095: switch (dgst_rep) {
1096: case SSH_FP_HEX:
1097: retval = fingerprint_hex(dgst_raw, dgst_raw_len);
1098: break;
1099: case SSH_FP_BUBBLEBABBLE:
1100: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1101: break;
1102: case SSH_FP_RANDOMART:
1103: retval = fingerprint_randomart(dgst_raw, dgst_raw_len, k);
1104: break;
1105: default:
1106: explicit_bzero(dgst_raw, dgst_raw_len);
1107: free(dgst_raw);
1108: return NULL;
1109: }
1110: explicit_bzero(dgst_raw, dgst_raw_len);
1111: free(dgst_raw);
1112: return retval;
1113: }
1114:
1115: #ifdef WITH_SSH1
1116: /*
1117: * Reads a multiple-precision integer in decimal from the buffer, and advances
1118: * the pointer. The integer must already be initialized. This function is
1119: * permitted to modify the buffer. This leaves *cpp to point just beyond the
1120: * last processed character.
1121: */
1122: static int
1123: read_decimal_bignum(char **cpp, BIGNUM *v)
1124: {
1125: char *cp;
1126: size_t e;
1127: int skip = 1; /* skip white space */
1128:
1129: cp = *cpp;
1130: while (*cp == ' ' || *cp == '\t')
1131: cp++;
1132: e = strspn(cp, "0123456789");
1133: if (e == 0)
1134: return SSH_ERR_INVALID_FORMAT;
1135: if (e > SSHBUF_MAX_BIGNUM * 3)
1136: return SSH_ERR_BIGNUM_TOO_LARGE;
1137: if (cp[e] == '\0')
1138: skip = 0;
1139: else if (index(" \t\r\n", cp[e]) == NULL)
1140: return SSH_ERR_INVALID_FORMAT;
1141: cp[e] = '\0';
1142: if (BN_dec2bn(&v, cp) <= 0)
1143: return SSH_ERR_INVALID_FORMAT;
1144: *cpp = cp + e + skip;
1145: return 0;
1146: }
1147: #endif /* WITH_SSH1 */
1148:
1149: /* returns 0 ok, and < 0 error */
1150: int
1151: sshkey_read(struct sshkey *ret, char **cpp)
1152: {
1153: struct sshkey *k;
1154: int retval = SSH_ERR_INVALID_FORMAT;
1155: char *cp, *space;
1156: int r, type, curve_nid = -1;
1157: struct sshbuf *blob;
1158: #ifdef WITH_SSH1
1159: char *ep;
1160: u_long bits;
1161: #endif /* WITH_SSH1 */
1162:
1163: cp = *cpp;
1164:
1165: switch (ret->type) {
1166: case KEY_RSA1:
1167: #ifdef WITH_SSH1
1168: /* Get number of bits. */
1169: bits = strtoul(cp, &ep, 10);
1170: if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1171: bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1172: return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1173: /* Get public exponent, public modulus. */
1174: if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1175: return r;
1176: if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1177: return r;
1178: *cpp = ep;
1179: /* validate the claimed number of bits */
1180: if (BN_num_bits(ret->rsa->n) != (int)bits)
1181: return SSH_ERR_KEY_BITS_MISMATCH;
1182: retval = 0;
1183: #endif /* WITH_SSH1 */
1184: break;
1185: case KEY_UNSPEC:
1186: case KEY_RSA:
1187: case KEY_DSA:
1188: case KEY_ECDSA:
1189: case KEY_ED25519:
1190: case KEY_DSA_CERT_V00:
1191: case KEY_RSA_CERT_V00:
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;
1210: if (ret->type == KEY_UNSPEC) {
1211: ret->type = type;
1212: } else if (ret->type != type)
1213: return SSH_ERR_KEY_TYPE_MISMATCH;
1214: if ((blob = sshbuf_new()) == NULL)
1215: return SSH_ERR_ALLOC_FAIL;
1216: /* trim comment */
1217: space = strchr(cp, ' ');
1218: if (space)
1219: *space = '\0';
1220: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1221: sshbuf_free(blob);
1222: return r;
1223: }
1224: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1225: sshbuf_len(blob), &k)) != 0) {
1226: sshbuf_free(blob);
1227: return r;
1228: }
1229: sshbuf_free(blob);
1230: if (k->type != type) {
1231: sshkey_free(k);
1232: return SSH_ERR_KEY_TYPE_MISMATCH;
1233: }
1234: if (sshkey_type_plain(type) == KEY_ECDSA &&
1235: curve_nid != k->ecdsa_nid) {
1236: sshkey_free(k);
1237: return SSH_ERR_EC_CURVE_MISMATCH;
1238: }
1239: /*XXXX*/
1240: if (sshkey_is_cert(ret)) {
1241: if (!sshkey_is_cert(k)) {
1242: sshkey_free(k);
1243: return SSH_ERR_EXPECTED_CERT;
1244: }
1245: if (ret->cert != NULL)
1246: cert_free(ret->cert);
1247: ret->cert = k->cert;
1248: k->cert = NULL;
1249: }
1250: #ifdef WITH_OPENSSL
1251: if (sshkey_type_plain(ret->type) == KEY_RSA) {
1252: if (ret->rsa != NULL)
1253: RSA_free(ret->rsa);
1254: ret->rsa = k->rsa;
1255: k->rsa = NULL;
1256: #ifdef DEBUG_PK
1257: RSA_print_fp(stderr, ret->rsa, 8);
1258: #endif
1259: }
1260: if (sshkey_type_plain(ret->type) == KEY_DSA) {
1261: if (ret->dsa != NULL)
1262: DSA_free(ret->dsa);
1263: ret->dsa = k->dsa;
1264: k->dsa = NULL;
1265: #ifdef DEBUG_PK
1266: DSA_print_fp(stderr, ret->dsa, 8);
1267: #endif
1268: }
1269: if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1270: if (ret->ecdsa != NULL)
1271: EC_KEY_free(ret->ecdsa);
1272: ret->ecdsa = k->ecdsa;
1273: ret->ecdsa_nid = k->ecdsa_nid;
1274: k->ecdsa = NULL;
1275: k->ecdsa_nid = -1;
1276: #ifdef DEBUG_PK
1277: sshkey_dump_ec_key(ret->ecdsa);
1278: #endif
1279: }
1280: #endif /* WITH_OPENSSL */
1281: if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1282: free(ret->ed25519_pk);
1283: ret->ed25519_pk = k->ed25519_pk;
1284: k->ed25519_pk = NULL;
1285: #ifdef DEBUG_PK
1286: /* XXX */
1287: #endif
1288: }
1289: retval = 0;
1290: /*XXXX*/
1291: sshkey_free(k);
1292: if (retval != 0)
1293: break;
1294: /* advance cp: skip whitespace and data */
1295: while (*cp == ' ' || *cp == '\t')
1296: cp++;
1297: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
1298: cp++;
1299: *cpp = cp;
1300: break;
1301: default:
1302: return SSH_ERR_INVALID_ARGUMENT;
1303: }
1304: return retval;
1305: }
1306:
1307: int
1308: sshkey_write(const struct sshkey *key, FILE *f)
1309: {
1310: int ret = SSH_ERR_INTERNAL_ERROR;
1311: struct sshbuf *b = NULL, *bb = NULL;
1312: char *uu = NULL;
1313: #ifdef WITH_SSH1
1314: u_int bits = 0;
1315: char *dec_e = NULL, *dec_n = NULL;
1316: #endif /* WITH_SSH1 */
1317:
1318: if (sshkey_is_cert(key)) {
1319: if (key->cert == NULL)
1320: return SSH_ERR_EXPECTED_CERT;
1321: if (sshbuf_len(key->cert->certblob) == 0)
1322: return SSH_ERR_KEY_LACKS_CERTBLOB;
1323: }
1324: if ((b = sshbuf_new()) == NULL)
1325: return SSH_ERR_ALLOC_FAIL;
1326: switch (key->type) {
1327: #ifdef WITH_SSH1
1328: case KEY_RSA1:
1329: if (key->rsa == NULL || key->rsa->e == NULL ||
1330: key->rsa->n == NULL) {
1331: ret = SSH_ERR_INVALID_ARGUMENT;
1332: goto out;
1333: }
1334: if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1335: (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1336: ret = SSH_ERR_ALLOC_FAIL;
1337: goto out;
1338: }
1339: /* size of modulus 'n' */
1340: if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1341: ret = SSH_ERR_INVALID_ARGUMENT;
1342: goto out;
1343: }
1344: if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1345: goto out;
1346: #endif /* WITH_SSH1 */
1347: break;
1348: #ifdef WITH_OPENSSL
1349: case KEY_DSA:
1350: case KEY_DSA_CERT_V00:
1351: case KEY_DSA_CERT:
1352: case KEY_ECDSA:
1353: case KEY_ECDSA_CERT:
1354: case KEY_RSA:
1355: case KEY_RSA_CERT_V00:
1356: case KEY_RSA_CERT:
1357: #endif /* WITH_OPENSSL */
1358: case KEY_ED25519:
1359: case KEY_ED25519_CERT:
1360: if ((bb = sshbuf_new()) == NULL) {
1361: ret = SSH_ERR_ALLOC_FAIL;
1362: goto out;
1363: }
1364: if ((ret = sshkey_to_blob_buf(key, bb)) != 0)
1365: goto out;
1366: if ((uu = sshbuf_dtob64(bb)) == NULL) {
1367: ret = SSH_ERR_ALLOC_FAIL;
1368: goto out;
1369: }
1370: if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
1371: goto out;
1372: if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
1373: goto out;
1374: break;
1375: default:
1376: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1377: goto out;
1378: }
1379: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1380: if (feof(f))
1381: errno = EPIPE;
1382: ret = SSH_ERR_SYSTEM_ERROR;
1383: goto out;
1384: }
1385: ret = 0;
1386: out:
1387: if (b != NULL)
1388: sshbuf_free(b);
1389: if (bb != NULL)
1390: sshbuf_free(bb);
1391: if (uu != NULL)
1392: free(uu);
1393: #ifdef WITH_SSH1
1394: if (dec_e != NULL)
1395: OPENSSL_free(dec_e);
1396: if (dec_n != NULL)
1397: OPENSSL_free(dec_n);
1398: #endif /* WITH_SSH1 */
1399: return ret;
1400: }
1401:
1402: const char *
1403: sshkey_cert_type(const struct sshkey *k)
1404: {
1405: switch (k->cert->type) {
1406: case SSH2_CERT_TYPE_USER:
1407: return "user";
1408: case SSH2_CERT_TYPE_HOST:
1409: return "host";
1410: default:
1411: return "unknown";
1412: }
1413: }
1414:
1415: #ifdef WITH_OPENSSL
1416: static int
1417: rsa_generate_private_key(u_int bits, RSA **rsap)
1418: {
1419: RSA *private = NULL;
1420: BIGNUM *f4 = NULL;
1421: int ret = SSH_ERR_INTERNAL_ERROR;
1422:
1423: if (rsap == NULL ||
1424: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1425: bits > SSHBUF_MAX_BIGNUM * 8)
1426: return SSH_ERR_INVALID_ARGUMENT;
1427: *rsap = NULL;
1428: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1429: ret = SSH_ERR_ALLOC_FAIL;
1430: goto out;
1431: }
1432: if (!BN_set_word(f4, RSA_F4) ||
1433: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1434: ret = SSH_ERR_LIBCRYPTO_ERROR;
1435: goto out;
1436: }
1437: *rsap = private;
1438: private = NULL;
1439: ret = 0;
1440: out:
1441: if (private != NULL)
1442: RSA_free(private);
1443: if (f4 != NULL)
1444: BN_free(f4);
1445: return ret;
1446: }
1447:
1448: static int
1449: dsa_generate_private_key(u_int bits, DSA **dsap)
1450: {
1451: DSA *private;
1452: int ret = SSH_ERR_INTERNAL_ERROR;
1453:
1454: if (dsap == NULL || bits != 1024)
1455: return SSH_ERR_INVALID_ARGUMENT;
1456: if ((private = DSA_new()) == NULL) {
1457: ret = SSH_ERR_ALLOC_FAIL;
1458: goto out;
1459: }
1460: *dsap = NULL;
1461: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1462: NULL, NULL) || !DSA_generate_key(private)) {
1463: DSA_free(private);
1464: ret = SSH_ERR_LIBCRYPTO_ERROR;
1465: goto out;
1466: }
1467: *dsap = private;
1468: private = NULL;
1469: ret = 0;
1470: out:
1471: if (private != NULL)
1472: DSA_free(private);
1473: return ret;
1474: }
1475:
1476: int
1477: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1478: {
1479: EC_GROUP *eg;
1480: int nids[] = {
1481: NID_X9_62_prime256v1,
1482: NID_secp384r1,
1483: NID_secp521r1,
1484: -1
1485: };
1486: int nid;
1487: u_int i;
1488: BN_CTX *bnctx;
1489: const EC_GROUP *g = EC_KEY_get0_group(k);
1490:
1491: /*
1492: * The group may be stored in a ASN.1 encoded private key in one of two
1493: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1494: * or explicit group parameters encoded into the key blob. Only the
1495: * "named group" case sets the group NID for us, but we can figure
1496: * it out for the other case by comparing against all the groups that
1497: * are supported.
1498: */
1499: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1500: return nid;
1501: if ((bnctx = BN_CTX_new()) == NULL)
1502: return -1;
1503: for (i = 0; nids[i] != -1; i++) {
1504: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1505: BN_CTX_free(bnctx);
1506: return -1;
1507: }
1508: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1509: break;
1510: EC_GROUP_free(eg);
1511: }
1512: BN_CTX_free(bnctx);
1513: if (nids[i] != -1) {
1514: /* Use the group with the NID attached */
1515: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1516: if (EC_KEY_set_group(k, eg) != 1) {
1517: EC_GROUP_free(eg);
1518: return -1;
1519: }
1520: }
1521: return nids[i];
1522: }
1523:
1524: static int
1525: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1526: {
1527: EC_KEY *private;
1528: int ret = SSH_ERR_INTERNAL_ERROR;
1529:
1530: if (nid == NULL || ecdsap == NULL ||
1531: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1532: return SSH_ERR_INVALID_ARGUMENT;
1533: *ecdsap = NULL;
1534: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1535: ret = SSH_ERR_ALLOC_FAIL;
1536: goto out;
1537: }
1538: if (EC_KEY_generate_key(private) != 1) {
1539: ret = SSH_ERR_LIBCRYPTO_ERROR;
1540: goto out;
1541: }
1542: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1543: *ecdsap = private;
1544: private = NULL;
1545: ret = 0;
1546: out:
1547: if (private != NULL)
1548: EC_KEY_free(private);
1549: return ret;
1550: }
1551: #endif /* WITH_OPENSSL */
1552:
1553: int
1554: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1555: {
1556: struct sshkey *k;
1557: int ret = SSH_ERR_INTERNAL_ERROR;
1558:
1559: if (keyp == NULL)
1560: return SSH_ERR_INVALID_ARGUMENT;
1561: *keyp = NULL;
1562: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1563: return SSH_ERR_ALLOC_FAIL;
1564: switch (type) {
1565: case KEY_ED25519:
1566: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1567: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1568: ret = SSH_ERR_ALLOC_FAIL;
1569: break;
1570: }
1571: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1572: ret = 0;
1573: break;
1574: #ifdef WITH_OPENSSL
1575: case KEY_DSA:
1576: ret = dsa_generate_private_key(bits, &k->dsa);
1577: break;
1578: case KEY_ECDSA:
1579: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1580: &k->ecdsa);
1581: break;
1582: case KEY_RSA:
1583: case KEY_RSA1:
1584: ret = rsa_generate_private_key(bits, &k->rsa);
1585: break;
1586: #endif /* WITH_OPENSSL */
1587: default:
1588: ret = SSH_ERR_INVALID_ARGUMENT;
1589: }
1590: if (ret == 0) {
1591: k->type = type;
1592: *keyp = k;
1593: } else
1594: sshkey_free(k);
1595: return ret;
1596: }
1597:
1598: int
1599: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1600: {
1601: u_int i;
1602: const struct sshkey_cert *from;
1603: struct sshkey_cert *to;
1604: int ret = SSH_ERR_INTERNAL_ERROR;
1605:
1606: if (to_key->cert != NULL) {
1607: cert_free(to_key->cert);
1608: to_key->cert = NULL;
1609: }
1610:
1611: if ((from = from_key->cert) == NULL)
1612: return SSH_ERR_INVALID_ARGUMENT;
1613:
1614: if ((to = to_key->cert = cert_new()) == NULL)
1615: return SSH_ERR_ALLOC_FAIL;
1616:
1617: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1618: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1619: (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1620: return ret;
1621:
1622: to->serial = from->serial;
1623: to->type = from->type;
1624: if (from->key_id == NULL)
1625: to->key_id = NULL;
1626: else if ((to->key_id = strdup(from->key_id)) == NULL)
1627: return SSH_ERR_ALLOC_FAIL;
1628: to->valid_after = from->valid_after;
1629: to->valid_before = from->valid_before;
1630: if (from->signature_key == NULL)
1631: to->signature_key = NULL;
1632: else if ((ret = sshkey_from_private(from->signature_key,
1633: &to->signature_key)) != 0)
1634: return ret;
1635:
1636: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1637: return SSH_ERR_INVALID_ARGUMENT;
1638: if (from->nprincipals > 0) {
1639: if ((to->principals = calloc(from->nprincipals,
1640: sizeof(*to->principals))) == NULL)
1641: return SSH_ERR_ALLOC_FAIL;
1642: for (i = 0; i < from->nprincipals; i++) {
1643: to->principals[i] = strdup(from->principals[i]);
1644: if (to->principals[i] == NULL) {
1645: to->nprincipals = i;
1646: return SSH_ERR_ALLOC_FAIL;
1647: }
1648: }
1649: }
1650: to->nprincipals = from->nprincipals;
1651: return 0;
1652: }
1653:
1654: int
1655: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1656: {
1657: struct sshkey *n = NULL;
1658: int ret = SSH_ERR_INTERNAL_ERROR;
1659:
1660: if (pkp != NULL)
1661: *pkp = NULL;
1662:
1663: switch (k->type) {
1664: #ifdef WITH_OPENSSL
1665: case KEY_DSA:
1666: case KEY_DSA_CERT_V00:
1667: case KEY_DSA_CERT:
1668: if ((n = sshkey_new(k->type)) == NULL)
1669: return SSH_ERR_ALLOC_FAIL;
1670: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1671: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1672: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1673: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1674: sshkey_free(n);
1675: return SSH_ERR_ALLOC_FAIL;
1676: }
1677: break;
1678: case KEY_ECDSA:
1679: case KEY_ECDSA_CERT:
1680: if ((n = sshkey_new(k->type)) == NULL)
1681: return SSH_ERR_ALLOC_FAIL;
1682: n->ecdsa_nid = k->ecdsa_nid;
1683: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1684: if (n->ecdsa == NULL) {
1685: sshkey_free(n);
1686: return SSH_ERR_ALLOC_FAIL;
1687: }
1688: if (EC_KEY_set_public_key(n->ecdsa,
1689: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1690: sshkey_free(n);
1691: return SSH_ERR_LIBCRYPTO_ERROR;
1692: }
1693: break;
1694: case KEY_RSA:
1695: case KEY_RSA1:
1696: case KEY_RSA_CERT_V00:
1697: case KEY_RSA_CERT:
1698: if ((n = sshkey_new(k->type)) == NULL)
1699: return SSH_ERR_ALLOC_FAIL;
1700: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1701: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1702: sshkey_free(n);
1703: return SSH_ERR_ALLOC_FAIL;
1704: }
1705: break;
1706: #endif /* WITH_OPENSSL */
1707: case KEY_ED25519:
1708: case KEY_ED25519_CERT:
1709: if ((n = sshkey_new(k->type)) == NULL)
1710: return SSH_ERR_ALLOC_FAIL;
1711: if (k->ed25519_pk != NULL) {
1712: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1713: sshkey_free(n);
1714: return SSH_ERR_ALLOC_FAIL;
1715: }
1716: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1717: }
1718: break;
1719: default:
1720: return SSH_ERR_KEY_TYPE_UNKNOWN;
1721: }
1722: if (sshkey_is_cert(k)) {
1723: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1724: sshkey_free(n);
1725: return ret;
1726: }
1727: }
1728: *pkp = n;
1729: return 0;
1730: }
1731:
1732: static int
1733: cert_parse(struct sshbuf *b, struct sshkey *key, const u_char *blob,
1734: size_t blen)
1735: {
1.4 ! djm 1736: struct sshbuf *principals = NULL, *crit = NULL, *exts = NULL;
1.1 djm 1737: u_char *sig_key = NULL, *sig = NULL;
1.4 ! djm 1738: size_t signed_len = 0, sklen = 0, slen = 0, kidlen = 0;
1.1 djm 1739: int ret = SSH_ERR_INTERNAL_ERROR;
1740: int v00 = sshkey_cert_is_legacy(key);
1741:
1742: /* Copy the entire key blob for verification and later serialisation */
1743: if ((ret = sshbuf_put(key->cert->certblob, blob, blen)) != 0)
1744: return ret;
1745:
1746: if ((!v00 && (ret = sshbuf_get_u64(b, &key->cert->serial)) != 0) ||
1747: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1748: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 ! djm 1749: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1750: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1751: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 ! djm 1752: (ret = sshbuf_froms(b, &crit)) != 0 ||
! 1753: (!v00 && (ret = sshbuf_froms(b, &exts)) != 0) ||
1.1 djm 1754: (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
1755: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1756: (ret = sshbuf_get_string(b, &sig_key, &sklen)) != 0) {
1757: /* XXX debug print error for ret */
1758: ret = SSH_ERR_INVALID_FORMAT;
1759: goto out;
1760: }
1761:
1762: /* Signature is left in the buffer so we can calculate this length */
1763: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1764:
1765: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1766: ret = SSH_ERR_INVALID_FORMAT;
1767: goto out;
1768: }
1769:
1770: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1771: key->cert->type != SSH2_CERT_TYPE_HOST) {
1772: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1773: goto out;
1774: }
1775:
1.4 ! djm 1776: /* Parse principals section */
! 1777: while (sshbuf_len(principals) > 0) {
! 1778: char *principal = NULL;
! 1779: char **oprincipals = NULL;
! 1780:
1.1 djm 1781: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1782: ret = SSH_ERR_INVALID_FORMAT;
1783: goto out;
1784: }
1.4 ! djm 1785: if ((ret = sshbuf_get_cstring(principals, &principal,
! 1786: NULL)) != 0) {
1.1 djm 1787: ret = SSH_ERR_INVALID_FORMAT;
1788: goto out;
1789: }
1790: oprincipals = key->cert->principals;
1791: key->cert->principals = realloc(key->cert->principals,
1792: (key->cert->nprincipals + 1) *
1793: sizeof(*key->cert->principals));
1794: if (key->cert->principals == NULL) {
1795: free(principal);
1796: key->cert->principals = oprincipals;
1797: ret = SSH_ERR_ALLOC_FAIL;
1798: goto out;
1799: }
1800: key->cert->principals[key->cert->nprincipals++] = principal;
1801: }
1802:
1.4 ! djm 1803: /*
! 1804: * Stash a copies of the critical options and extensions sections
! 1805: * for later use.
! 1806: */
! 1807: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
! 1808: (exts != NULL &&
! 1809: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1810: goto out;
1811:
1.4 ! djm 1812: /*
! 1813: * Validate critical options and extensions sections format.
! 1814: * NB. extensions are not present in v00 certs.
! 1815: */
! 1816: while (sshbuf_len(crit) != 0) {
! 1817: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
! 1818: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
! 1819: sshbuf_reset(key->cert->critical);
1.1 djm 1820: ret = SSH_ERR_INVALID_FORMAT;
1821: goto out;
1822: }
1823: }
1.4 ! djm 1824: while (exts != NULL && sshbuf_len(exts) != 0) {
! 1825: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
! 1826: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
! 1827: sshbuf_reset(key->cert->extensions);
1.1 djm 1828: ret = SSH_ERR_INVALID_FORMAT;
1829: goto out;
1830: }
1831: }
1832:
1.4 ! djm 1833: /* Parse CA key and check signature */
1.1 djm 1834: if (sshkey_from_blob_internal(sig_key, sklen,
1835: &key->cert->signature_key, 0) != 0) {
1836: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1837: goto out;
1838: }
1839: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1840: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1841: goto out;
1842: }
1843: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1844: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1845: goto out;
1.4 ! djm 1846:
! 1847: /* Success */
1.1 djm 1848: ret = 0;
1849: out:
1.4 ! djm 1850: sshbuf_free(crit);
! 1851: sshbuf_free(exts);
! 1852: sshbuf_free(principals);
1.1 djm 1853: free(sig_key);
1854: free(sig);
1855: return ret;
1856: }
1857:
1858: static int
1859: sshkey_from_blob_internal(const u_char *blob, size_t blen,
1860: struct sshkey **keyp, int allow_cert)
1861: {
1862: struct sshbuf *b = NULL;
1863: int type, nid = -1, ret = SSH_ERR_INTERNAL_ERROR;
1864: char *ktype = NULL, *curve = NULL;
1865: struct sshkey *key = NULL;
1866: size_t len;
1867: u_char *pk = NULL;
1868: #ifdef WITH_OPENSSL
1869: EC_POINT *q = NULL;
1870: #endif /* WITH_OPENSSL */
1871:
1872: #ifdef DEBUG_PK /* XXX */
1873: dump_base64(stderr, blob, blen);
1874: #endif
1875: *keyp = NULL;
1876: if ((b = sshbuf_from(blob, blen)) == NULL)
1877: return SSH_ERR_ALLOC_FAIL;
1878: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1879: ret = SSH_ERR_INVALID_FORMAT;
1880: goto out;
1881: }
1882:
1883: type = sshkey_type_from_name(ktype);
1884: if (sshkey_type_plain(type) == KEY_ECDSA)
1885: nid = sshkey_ecdsa_nid_from_name(ktype);
1886: if (!allow_cert && sshkey_type_is_cert(type)) {
1887: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1888: goto out;
1889: }
1890: switch (type) {
1891: #ifdef WITH_OPENSSL
1892: case KEY_RSA_CERT:
1893: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1894: ret = SSH_ERR_INVALID_FORMAT;
1895: goto out;
1896: }
1897: /* FALLTHROUGH */
1898: case KEY_RSA:
1899: case KEY_RSA_CERT_V00:
1900: if ((key = sshkey_new(type)) == NULL) {
1901: ret = SSH_ERR_ALLOC_FAIL;
1902: goto out;
1903: }
1904: if (sshbuf_get_bignum2(b, key->rsa->e) == -1 ||
1905: sshbuf_get_bignum2(b, key->rsa->n) == -1) {
1906: ret = SSH_ERR_INVALID_FORMAT;
1907: goto out;
1908: }
1909: #ifdef DEBUG_PK
1910: RSA_print_fp(stderr, key->rsa, 8);
1911: #endif
1912: break;
1913: case KEY_DSA_CERT:
1914: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1915: ret = SSH_ERR_INVALID_FORMAT;
1916: goto out;
1917: }
1918: /* FALLTHROUGH */
1919: case KEY_DSA:
1920: case KEY_DSA_CERT_V00:
1921: if ((key = sshkey_new(type)) == NULL) {
1922: ret = SSH_ERR_ALLOC_FAIL;
1923: goto out;
1924: }
1925: if (sshbuf_get_bignum2(b, key->dsa->p) == -1 ||
1926: sshbuf_get_bignum2(b, key->dsa->q) == -1 ||
1927: sshbuf_get_bignum2(b, key->dsa->g) == -1 ||
1928: sshbuf_get_bignum2(b, key->dsa->pub_key) == -1) {
1929: ret = SSH_ERR_INVALID_FORMAT;
1930: goto out;
1931: }
1932: #ifdef DEBUG_PK
1933: DSA_print_fp(stderr, key->dsa, 8);
1934: #endif
1935: break;
1936: case KEY_ECDSA_CERT:
1937: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1938: ret = SSH_ERR_INVALID_FORMAT;
1939: goto out;
1940: }
1941: /* FALLTHROUGH */
1942: case KEY_ECDSA:
1943: if ((key = sshkey_new(type)) == NULL) {
1944: ret = SSH_ERR_ALLOC_FAIL;
1945: goto out;
1946: }
1947: key->ecdsa_nid = nid;
1948: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1949: ret = SSH_ERR_INVALID_FORMAT;
1950: goto out;
1951: }
1952: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1953: ret = SSH_ERR_EC_CURVE_MISMATCH;
1954: goto out;
1955: }
1956: if (key->ecdsa != NULL)
1957: EC_KEY_free(key->ecdsa);
1958: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1959: == NULL) {
1960: ret = SSH_ERR_EC_CURVE_INVALID;
1961: goto out;
1962: }
1963: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
1964: ret = SSH_ERR_ALLOC_FAIL;
1965: goto out;
1966: }
1967: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
1968: ret = SSH_ERR_INVALID_FORMAT;
1969: goto out;
1970: }
1971: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1972: q) != 0) {
1973: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1974: goto out;
1975: }
1976: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
1977: /* XXX assume it is a allocation error */
1978: ret = SSH_ERR_ALLOC_FAIL;
1979: goto out;
1980: }
1981: #ifdef DEBUG_PK
1982: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1983: #endif
1984: break;
1985: #endif /* WITH_OPENSSL */
1986: case KEY_ED25519_CERT:
1987: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1988: ret = SSH_ERR_INVALID_FORMAT;
1989: goto out;
1990: }
1991: /* FALLTHROUGH */
1992: case KEY_ED25519:
1993: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
1994: goto out;
1995: if (len != ED25519_PK_SZ) {
1996: ret = SSH_ERR_INVALID_FORMAT;
1997: goto out;
1998: }
1999: if ((key = sshkey_new(type)) == NULL) {
2000: ret = SSH_ERR_ALLOC_FAIL;
2001: goto out;
2002: }
2003: key->ed25519_pk = pk;
2004: pk = NULL;
2005: break;
2006: case KEY_UNSPEC:
2007: if ((key = sshkey_new(type)) == NULL) {
2008: ret = SSH_ERR_ALLOC_FAIL;
2009: goto out;
2010: }
2011: break;
2012: default:
2013: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2014: goto out;
2015: }
2016:
2017: /* Parse certificate potion */
2018: if (sshkey_is_cert(key) &&
2019: (ret = cert_parse(b, key, blob, blen)) != 0)
2020: goto out;
2021:
2022: if (key != NULL && sshbuf_len(b) != 0) {
2023: ret = SSH_ERR_INVALID_FORMAT;
2024: goto out;
2025: }
2026: ret = 0;
2027: *keyp = key;
2028: key = NULL;
2029: out:
2030: sshbuf_free(b);
2031: sshkey_free(key);
2032: free(ktype);
2033: free(curve);
2034: free(pk);
2035: #ifdef WITH_OPENSSL
2036: if (q != NULL)
2037: EC_POINT_free(q);
2038: #endif /* WITH_OPENSSL */
2039: return ret;
2040: }
2041:
2042: int
2043: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2044: {
2045: return sshkey_from_blob_internal(blob, blen, keyp, 1);
2046: }
2047:
2048: int
2049: sshkey_sign(const struct sshkey *key,
2050: u_char **sigp, size_t *lenp,
2051: const u_char *data, size_t datalen, u_int compat)
2052: {
2053: if (sigp != NULL)
2054: *sigp = NULL;
2055: if (lenp != NULL)
2056: *lenp = 0;
2057: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2058: return SSH_ERR_INVALID_ARGUMENT;
2059: switch (key->type) {
2060: #ifdef WITH_OPENSSL
2061: case KEY_DSA_CERT_V00:
2062: case KEY_DSA_CERT:
2063: case KEY_DSA:
2064: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2065: case KEY_ECDSA_CERT:
2066: case KEY_ECDSA:
2067: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2068: case KEY_RSA_CERT_V00:
2069: case KEY_RSA_CERT:
2070: case KEY_RSA:
2071: return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2072: #endif /* WITH_OPENSSL */
2073: case KEY_ED25519:
2074: case KEY_ED25519_CERT:
2075: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2076: default:
2077: return SSH_ERR_KEY_TYPE_UNKNOWN;
2078: }
2079: }
2080:
2081: /*
2082: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2083: */
2084: int
2085: sshkey_verify(const struct sshkey *key,
2086: const u_char *sig, size_t siglen,
2087: const u_char *data, size_t dlen, u_int compat)
2088: {
2089: if (siglen == 0)
2090: return -1;
2091:
2092: if (dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2093: return SSH_ERR_INVALID_ARGUMENT;
2094: switch (key->type) {
2095: #ifdef WITH_OPENSSL
2096: case KEY_DSA_CERT_V00:
2097: case KEY_DSA_CERT:
2098: case KEY_DSA:
2099: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2100: case KEY_ECDSA_CERT:
2101: case KEY_ECDSA:
2102: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2103: case KEY_RSA_CERT_V00:
2104: case KEY_RSA_CERT:
2105: case KEY_RSA:
2106: return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2107: #endif /* WITH_OPENSSL */
2108: case KEY_ED25519:
2109: case KEY_ED25519_CERT:
2110: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2111: default:
2112: return SSH_ERR_KEY_TYPE_UNKNOWN;
2113: }
2114: }
2115:
2116: /* Converts a private to a public key */
2117: int
2118: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2119: {
2120: struct sshkey *pk;
2121: int ret = SSH_ERR_INTERNAL_ERROR;
2122:
2123: if (dkp != NULL)
2124: *dkp = NULL;
2125:
2126: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2127: return SSH_ERR_ALLOC_FAIL;
2128: pk->type = k->type;
2129: pk->flags = k->flags;
2130: pk->ecdsa_nid = k->ecdsa_nid;
2131: pk->dsa = NULL;
2132: pk->ecdsa = NULL;
2133: pk->rsa = NULL;
2134: pk->ed25519_pk = NULL;
2135: pk->ed25519_sk = NULL;
2136:
2137: switch (k->type) {
2138: #ifdef WITH_OPENSSL
2139: case KEY_RSA_CERT_V00:
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_V00:
2154: case KEY_DSA_CERT:
2155: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2156: goto fail;
2157: /* FALLTHROUGH */
2158: case KEY_DSA:
2159: if ((pk->dsa = DSA_new()) == NULL ||
2160: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2161: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2162: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2163: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2164: ret = SSH_ERR_ALLOC_FAIL;
2165: goto fail;
2166: }
2167: break;
2168: case KEY_ECDSA_CERT:
2169: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2170: goto fail;
2171: /* FALLTHROUGH */
2172: case KEY_ECDSA:
2173: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2174: if (pk->ecdsa == NULL) {
2175: ret = SSH_ERR_ALLOC_FAIL;
2176: goto fail;
2177: }
2178: if (EC_KEY_set_public_key(pk->ecdsa,
2179: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2180: ret = SSH_ERR_LIBCRYPTO_ERROR;
2181: goto fail;
2182: }
2183: break;
2184: #endif /* WITH_OPENSSL */
2185: case KEY_ED25519_CERT:
2186: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2187: goto fail;
2188: /* FALLTHROUGH */
2189: case KEY_ED25519:
2190: if (k->ed25519_pk != NULL) {
2191: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2192: ret = SSH_ERR_ALLOC_FAIL;
2193: goto fail;
2194: }
2195: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2196: }
2197: break;
2198: default:
2199: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2200: fail:
2201: sshkey_free(pk);
2202: return ret;
2203: }
2204: *dkp = pk;
2205: return 0;
2206: }
2207:
2208: /* Convert a plain key to their _CERT equivalent */
2209: int
2210: sshkey_to_certified(struct sshkey *k, int legacy)
2211: {
2212: int newtype;
2213:
2214: switch (k->type) {
2215: #ifdef WITH_OPENSSL
2216: case KEY_RSA:
2217: newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
2218: break;
2219: case KEY_DSA:
2220: newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
2221: break;
2222: case KEY_ECDSA:
2223: if (legacy)
2224: return SSH_ERR_INVALID_ARGUMENT;
2225: newtype = KEY_ECDSA_CERT;
2226: break;
2227: #endif /* WITH_OPENSSL */
2228: case KEY_ED25519:
2229: if (legacy)
2230: return SSH_ERR_INVALID_ARGUMENT;
2231: newtype = KEY_ED25519_CERT;
2232: break;
2233: default:
2234: return SSH_ERR_INVALID_ARGUMENT;
2235: }
2236: if ((k->cert = cert_new()) == NULL)
2237: return SSH_ERR_ALLOC_FAIL;
2238: k->type = newtype;
2239: return 0;
2240: }
2241:
2242: /* Convert a certificate to its raw key equivalent */
2243: int
2244: sshkey_drop_cert(struct sshkey *k)
2245: {
2246: if (!sshkey_type_is_cert(k->type))
2247: return SSH_ERR_KEY_TYPE_UNKNOWN;
2248: cert_free(k->cert);
2249: k->cert = NULL;
2250: k->type = sshkey_type_plain(k->type);
2251: return 0;
2252: }
2253:
2254: /* Sign a certified key, (re-)generating the signed certblob. */
2255: int
2256: sshkey_certify(struct sshkey *k, struct sshkey *ca)
2257: {
2258: struct sshbuf *principals = NULL;
2259: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2260: size_t i, ca_len, sig_len;
2261: int ret = SSH_ERR_INTERNAL_ERROR;
2262: struct sshbuf *cert;
2263:
2264: if (k == NULL || k->cert == NULL ||
2265: k->cert->certblob == NULL || ca == NULL)
2266: return SSH_ERR_INVALID_ARGUMENT;
2267: if (!sshkey_is_cert(k))
2268: return SSH_ERR_KEY_TYPE_UNKNOWN;
2269: if (!sshkey_type_is_valid_ca(ca->type))
2270: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2271:
2272: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2273: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2274:
2275: cert = k->cert->certblob; /* for readability */
2276: sshbuf_reset(cert);
2277: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2278: goto out;
2279:
2280: /* -v01 certs put nonce first */
2281: arc4random_buf(&nonce, sizeof(nonce));
2282: if (!sshkey_cert_is_legacy(k)) {
2283: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2284: goto out;
2285: }
2286:
2287: /* XXX this substantially duplicates to_blob(); refactor */
2288: switch (k->type) {
2289: #ifdef WITH_OPENSSL
2290: case KEY_DSA_CERT_V00:
2291: case KEY_DSA_CERT:
2292: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2293: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2294: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2295: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2296: goto out;
2297: break;
2298: case KEY_ECDSA_CERT:
2299: if ((ret = sshbuf_put_cstring(cert,
2300: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2301: (ret = sshbuf_put_ec(cert,
2302: EC_KEY_get0_public_key(k->ecdsa),
2303: EC_KEY_get0_group(k->ecdsa))) != 0)
2304: goto out;
2305: break;
2306: case KEY_RSA_CERT_V00:
2307: case KEY_RSA_CERT:
2308: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2309: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2310: goto out;
2311: break;
2312: #endif /* WITH_OPENSSL */
2313: case KEY_ED25519_CERT:
2314: if ((ret = sshbuf_put_string(cert,
2315: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2316: goto out;
2317: break;
2318: default:
2319: ret = SSH_ERR_INVALID_ARGUMENT;
2320: }
2321:
2322: /* -v01 certs have a serial number next */
2323: if (!sshkey_cert_is_legacy(k)) {
2324: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
2325: goto out;
2326: }
2327:
2328: if ((ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2329: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2330: goto out;
2331:
2332: if ((principals = sshbuf_new()) == NULL) {
2333: ret = SSH_ERR_ALLOC_FAIL;
2334: goto out;
2335: }
2336: for (i = 0; i < k->cert->nprincipals; i++) {
2337: if ((ret = sshbuf_put_cstring(principals,
2338: k->cert->principals[i])) != 0)
2339: goto out;
2340: }
2341: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2342: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2343: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2344: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0)
2345: goto out;
2346:
2347: /* -v01 certs have non-critical options here */
2348: if (!sshkey_cert_is_legacy(k)) {
2349: if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
2350: goto out;
2351: }
2352:
2353: /* -v00 certs put the nonce at the end */
2354: if (sshkey_cert_is_legacy(k)) {
2355: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2356: goto out;
2357: }
2358:
2359: if ((ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2360: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2361: goto out;
2362:
2363: /* Sign the whole mess */
2364: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2365: sshbuf_len(cert), 0)) != 0)
2366: goto out;
2367:
2368: /* Append signature and we are done */
2369: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2370: goto out;
2371: ret = 0;
2372: out:
2373: if (ret != 0)
2374: sshbuf_reset(cert);
2375: if (sig_blob != NULL)
2376: free(sig_blob);
2377: if (ca_blob != NULL)
2378: free(ca_blob);
2379: if (principals != NULL)
2380: sshbuf_free(principals);
2381: return ret;
2382: }
2383:
2384: int
2385: sshkey_cert_check_authority(const struct sshkey *k,
2386: int want_host, int require_principal,
2387: const char *name, const char **reason)
2388: {
2389: u_int i, principal_matches;
2390: time_t now = time(NULL);
2391:
2392: if (reason != NULL)
2393: *reason = NULL;
2394:
2395: if (want_host) {
2396: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2397: *reason = "Certificate invalid: not a host certificate";
2398: return SSH_ERR_KEY_CERT_INVALID;
2399: }
2400: } else {
2401: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2402: *reason = "Certificate invalid: not a user certificate";
2403: return SSH_ERR_KEY_CERT_INVALID;
2404: }
2405: }
2406: if (now < 0) {
2407: /* yikes - system clock before epoch! */
2408: *reason = "Certificate invalid: not yet valid";
2409: return SSH_ERR_KEY_CERT_INVALID;
2410: }
2411: if ((u_int64_t)now < k->cert->valid_after) {
2412: *reason = "Certificate invalid: not yet valid";
2413: return SSH_ERR_KEY_CERT_INVALID;
2414: }
2415: if ((u_int64_t)now >= k->cert->valid_before) {
2416: *reason = "Certificate invalid: expired";
2417: return SSH_ERR_KEY_CERT_INVALID;
2418: }
2419: if (k->cert->nprincipals == 0) {
2420: if (require_principal) {
2421: *reason = "Certificate lacks principal list";
2422: return SSH_ERR_KEY_CERT_INVALID;
2423: }
2424: } else if (name != NULL) {
2425: principal_matches = 0;
2426: for (i = 0; i < k->cert->nprincipals; i++) {
2427: if (strcmp(name, k->cert->principals[i]) == 0) {
2428: principal_matches = 1;
2429: break;
2430: }
2431: }
2432: if (!principal_matches) {
2433: *reason = "Certificate invalid: name is not a listed "
2434: "principal";
2435: return SSH_ERR_KEY_CERT_INVALID;
2436: }
2437: }
2438: return 0;
2439: }
2440:
2441: int
2442: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2443: {
2444: int r = SSH_ERR_INTERNAL_ERROR;
2445:
2446: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2447: goto out;
2448: switch (key->type) {
2449: #ifdef WITH_OPENSSL
2450: case KEY_RSA:
2451: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2452: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2453: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2454: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2455: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2456: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2457: goto out;
2458: break;
2459: case KEY_RSA_CERT_V00:
2460: case KEY_RSA_CERT:
2461: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2462: r = SSH_ERR_INVALID_ARGUMENT;
2463: goto out;
2464: }
2465: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2466: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2467: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2468: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2469: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2470: goto out;
2471: break;
2472: case KEY_DSA:
2473: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2474: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2475: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2476: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2477: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2478: goto out;
2479: break;
2480: case KEY_DSA_CERT_V00:
2481: case KEY_DSA_CERT:
2482: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2483: r = SSH_ERR_INVALID_ARGUMENT;
2484: goto out;
2485: }
2486: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2487: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2488: goto out;
2489: break;
2490: case KEY_ECDSA:
2491: if ((r = sshbuf_put_cstring(b,
2492: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2493: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2494: (r = sshbuf_put_bignum2(b,
2495: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2496: goto out;
2497: break;
2498: case KEY_ECDSA_CERT:
2499: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2500: r = SSH_ERR_INVALID_ARGUMENT;
2501: goto out;
2502: }
2503: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2504: (r = sshbuf_put_bignum2(b,
2505: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2506: goto out;
2507: break;
2508: #endif /* WITH_OPENSSL */
2509: case KEY_ED25519:
2510: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2511: ED25519_PK_SZ)) != 0 ||
2512: (r = sshbuf_put_string(b, key->ed25519_sk,
2513: ED25519_SK_SZ)) != 0)
2514: goto out;
2515: break;
2516: case KEY_ED25519_CERT:
2517: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2518: r = SSH_ERR_INVALID_ARGUMENT;
2519: goto out;
2520: }
2521: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2522: (r = sshbuf_put_string(b, key->ed25519_pk,
2523: ED25519_PK_SZ)) != 0 ||
2524: (r = sshbuf_put_string(b, key->ed25519_sk,
2525: ED25519_SK_SZ)) != 0)
2526: goto out;
2527: break;
2528: default:
2529: r = SSH_ERR_INVALID_ARGUMENT;
2530: goto out;
2531: }
2532: /* success */
2533: r = 0;
2534: out:
2535: return r;
2536: }
2537:
2538: int
2539: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2540: {
2541: char *tname = NULL, *curve = NULL;
2542: struct sshkey *k = NULL;
2543: const u_char *cert;
2544: size_t len, pklen = 0, sklen = 0;
2545: int type, r = SSH_ERR_INTERNAL_ERROR;
2546: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2547: #ifdef WITH_OPENSSL
2548: BIGNUM *exponent = NULL;
2549: #endif /* WITH_OPENSSL */
2550:
2551: if (kp != NULL)
2552: *kp = NULL;
2553: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2554: goto out;
2555: type = sshkey_type_from_name(tname);
2556: switch (type) {
2557: #ifdef WITH_OPENSSL
2558: case KEY_DSA:
2559: if ((k = sshkey_new_private(type)) == NULL) {
2560: r = SSH_ERR_ALLOC_FAIL;
2561: goto out;
2562: }
2563: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2564: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2565: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2566: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2567: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2568: goto out;
2569: break;
2570: case KEY_DSA_CERT_V00:
2571: case KEY_DSA_CERT:
2572: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2573: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2574: (r = sshkey_add_private(k)) != 0 ||
2575: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2576: goto out;
2577: break;
2578: case KEY_ECDSA:
2579: if ((k = sshkey_new_private(type)) == NULL) {
2580: r = SSH_ERR_ALLOC_FAIL;
2581: goto out;
2582: }
2583: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2584: r = SSH_ERR_INVALID_ARGUMENT;
2585: goto out;
2586: }
2587: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2588: goto out;
2589: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2590: r = SSH_ERR_EC_CURVE_MISMATCH;
2591: goto out;
2592: }
2593: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2594: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2595: r = SSH_ERR_LIBCRYPTO_ERROR;
2596: goto out;
2597: }
2598: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2599: (r = sshbuf_get_bignum2(buf, exponent)))
2600: goto out;
2601: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2602: r = SSH_ERR_LIBCRYPTO_ERROR;
2603: goto out;
2604: }
2605: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2606: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2607: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2608: goto out;
2609: break;
2610: case KEY_ECDSA_CERT:
2611: if ((exponent = BN_new()) == NULL) {
2612: r = SSH_ERR_LIBCRYPTO_ERROR;
2613: goto out;
2614: }
2615: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2616: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2617: (r = sshkey_add_private(k)) != 0 ||
2618: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2619: goto out;
2620: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2621: r = SSH_ERR_LIBCRYPTO_ERROR;
2622: goto out;
2623: }
2624: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2625: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2626: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2627: goto out;
2628: break;
2629: case KEY_RSA:
2630: if ((k = sshkey_new_private(type)) == NULL) {
2631: r = SSH_ERR_ALLOC_FAIL;
2632: goto out;
2633: }
2634: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2635: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2636: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2637: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2638: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2639: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2640: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2641: goto out;
2642: break;
2643: case KEY_RSA_CERT_V00:
2644: case KEY_RSA_CERT:
2645: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2646: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2647: (r = sshkey_add_private(k)) != 0 ||
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) ||
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:
2673: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2674: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2675: (r = sshkey_add_private(k)) != 0 ||
2676: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2677: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2678: goto out;
2679: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2680: r = SSH_ERR_INVALID_FORMAT;
2681: goto out;
2682: }
2683: k->ed25519_pk = ed25519_pk;
2684: k->ed25519_sk = ed25519_sk;
2685: ed25519_pk = ed25519_sk = NULL;
2686: break;
2687: default:
2688: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2689: goto out;
2690: }
2691: #ifdef WITH_OPENSSL
2692: /* enable blinding */
2693: switch (k->type) {
2694: case KEY_RSA:
2695: case KEY_RSA_CERT_V00:
2696: case KEY_RSA_CERT:
2697: case KEY_RSA1:
2698: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2699: r = SSH_ERR_LIBCRYPTO_ERROR;
2700: goto out;
2701: }
2702: break;
2703: }
2704: #endif /* WITH_OPENSSL */
2705: /* success */
2706: r = 0;
2707: if (kp != NULL) {
2708: *kp = k;
2709: k = NULL;
2710: }
2711: out:
2712: free(tname);
2713: free(curve);
2714: #ifdef WITH_OPENSSL
2715: if (exponent != NULL)
2716: BN_clear_free(exponent);
2717: #endif /* WITH_OPENSSL */
2718: sshkey_free(k);
2719: if (ed25519_pk != NULL) {
2720: explicit_bzero(ed25519_pk, pklen);
2721: free(ed25519_pk);
2722: }
2723: if (ed25519_sk != NULL) {
2724: explicit_bzero(ed25519_sk, sklen);
2725: free(ed25519_sk);
2726: }
2727: return r;
2728: }
2729:
2730: #ifdef WITH_OPENSSL
2731: int
2732: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2733: {
2734: BN_CTX *bnctx;
2735: EC_POINT *nq = NULL;
2736: BIGNUM *order, *x, *y, *tmp;
2737: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2738:
2739: if ((bnctx = BN_CTX_new()) == NULL)
2740: return SSH_ERR_ALLOC_FAIL;
2741: BN_CTX_start(bnctx);
2742:
2743: /*
2744: * We shouldn't ever hit this case because bignum_get_ecpoint()
2745: * refuses to load GF2m points.
2746: */
2747: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2748: NID_X9_62_prime_field)
2749: goto out;
2750:
2751: /* Q != infinity */
2752: if (EC_POINT_is_at_infinity(group, public))
2753: goto out;
2754:
2755: if ((x = BN_CTX_get(bnctx)) == NULL ||
2756: (y = BN_CTX_get(bnctx)) == NULL ||
2757: (order = BN_CTX_get(bnctx)) == NULL ||
2758: (tmp = BN_CTX_get(bnctx)) == NULL) {
2759: ret = SSH_ERR_ALLOC_FAIL;
2760: goto out;
2761: }
2762:
2763: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2764: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2765: EC_POINT_get_affine_coordinates_GFp(group, public,
2766: x, y, bnctx) != 1) {
2767: ret = SSH_ERR_LIBCRYPTO_ERROR;
2768: goto out;
2769: }
2770: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2771: BN_num_bits(y) <= BN_num_bits(order) / 2)
2772: goto out;
2773:
2774: /* nQ == infinity (n == order of subgroup) */
2775: if ((nq = EC_POINT_new(group)) == NULL) {
2776: ret = SSH_ERR_ALLOC_FAIL;
2777: goto out;
2778: }
2779: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2780: ret = SSH_ERR_LIBCRYPTO_ERROR;
2781: goto out;
2782: }
2783: if (EC_POINT_is_at_infinity(group, nq) != 1)
2784: goto out;
2785:
2786: /* x < order - 1, y < order - 1 */
2787: if (!BN_sub(tmp, order, BN_value_one())) {
2788: ret = SSH_ERR_LIBCRYPTO_ERROR;
2789: goto out;
2790: }
2791: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2792: goto out;
2793: ret = 0;
2794: out:
2795: BN_CTX_free(bnctx);
2796: if (nq != NULL)
2797: EC_POINT_free(nq);
2798: return ret;
2799: }
2800:
2801: int
2802: sshkey_ec_validate_private(const EC_KEY *key)
2803: {
2804: BN_CTX *bnctx;
2805: BIGNUM *order, *tmp;
2806: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2807:
2808: if ((bnctx = BN_CTX_new()) == NULL)
2809: return SSH_ERR_ALLOC_FAIL;
2810: BN_CTX_start(bnctx);
2811:
2812: if ((order = BN_CTX_get(bnctx)) == NULL ||
2813: (tmp = BN_CTX_get(bnctx)) == NULL) {
2814: ret = SSH_ERR_ALLOC_FAIL;
2815: goto out;
2816: }
2817:
2818: /* log2(private) > log2(order)/2 */
2819: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2820: ret = SSH_ERR_LIBCRYPTO_ERROR;
2821: goto out;
2822: }
2823: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2824: BN_num_bits(order) / 2)
2825: goto out;
2826:
2827: /* private < order - 1 */
2828: if (!BN_sub(tmp, order, BN_value_one())) {
2829: ret = SSH_ERR_LIBCRYPTO_ERROR;
2830: goto out;
2831: }
2832: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2833: goto out;
2834: ret = 0;
2835: out:
2836: BN_CTX_free(bnctx);
2837: return ret;
2838: }
2839:
2840: void
2841: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2842: {
2843: BIGNUM *x, *y;
2844: BN_CTX *bnctx;
2845:
2846: if (point == NULL) {
2847: fputs("point=(NULL)\n", stderr);
2848: return;
2849: }
2850: if ((bnctx = BN_CTX_new()) == NULL) {
2851: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2852: return;
2853: }
2854: BN_CTX_start(bnctx);
2855: if ((x = BN_CTX_get(bnctx)) == NULL ||
2856: (y = BN_CTX_get(bnctx)) == NULL) {
2857: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2858: return;
2859: }
2860: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2861: NID_X9_62_prime_field) {
2862: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2863: return;
2864: }
2865: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2866: bnctx) != 1) {
2867: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2868: __func__);
2869: return;
2870: }
2871: fputs("x=", stderr);
2872: BN_print_fp(stderr, x);
2873: fputs("\ny=", stderr);
2874: BN_print_fp(stderr, y);
2875: fputs("\n", stderr);
2876: BN_CTX_free(bnctx);
2877: }
2878:
2879: void
2880: sshkey_dump_ec_key(const EC_KEY *key)
2881: {
2882: const BIGNUM *exponent;
2883:
2884: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2885: EC_KEY_get0_public_key(key));
2886: fputs("exponent=", stderr);
2887: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2888: fputs("(NULL)", stderr);
2889: else
2890: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2891: fputs("\n", stderr);
2892: }
2893: #endif /* WITH_OPENSSL */
2894:
2895: static int
2896: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2897: const char *passphrase, const char *comment, const char *ciphername,
2898: int rounds)
2899: {
1.4 ! djm 2900: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2901: u_char salt[SALT_LEN];
1.4 ! djm 2902: char *b64 = NULL;
1.1 djm 2903: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2904: u_int check;
2905: int r = SSH_ERR_INTERNAL_ERROR;
2906: struct sshcipher_ctx ciphercontext;
2907: const struct sshcipher *cipher;
2908: const char *kdfname = KDFNAME;
2909: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2910:
2911: memset(&ciphercontext, 0, sizeof(ciphercontext));
2912:
2913: if (rounds <= 0)
2914: rounds = DEFAULT_ROUNDS;
2915: if (passphrase == NULL || !strlen(passphrase)) {
2916: ciphername = "none";
2917: kdfname = "none";
2918: } else if (ciphername == NULL)
2919: ciphername = DEFAULT_CIPHERNAME;
2920: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2921: r = SSH_ERR_INVALID_ARGUMENT;
2922: goto out;
2923: }
2924: if ((cipher = cipher_by_name(ciphername)) == NULL) {
2925: r = SSH_ERR_INTERNAL_ERROR;
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;
2999: if ((r = cipher_crypt(&ciphercontext, 0, cp,
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);
3031: cipher_cleanup(&ciphercontext);
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;
3057: size_t i, keylen = 0, ivlen = 0, slen = 0;
3058: struct sshbuf *encoded = NULL, *decoded = NULL;
3059: struct sshbuf *kdf = NULL, *decrypted = NULL;
3060: struct sshcipher_ctx ciphercontext;
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: memset(&ciphercontext, 0, sizeof(ciphercontext));
3066: if (keyp != NULL)
3067: *keyp = NULL;
3068: if (commentp != NULL)
3069: *commentp = NULL;
3070:
3071: if ((encoded = sshbuf_new()) == NULL ||
3072: (decoded = sshbuf_new()) == NULL ||
3073: (decrypted = sshbuf_new()) == NULL) {
3074: r = SSH_ERR_ALLOC_FAIL;
3075: goto out;
3076: }
3077:
3078: /* check preamble */
3079: cp = sshbuf_ptr(blob);
3080: encoded_len = sshbuf_len(blob);
3081: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3082: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3083: r = SSH_ERR_INVALID_FORMAT;
3084: goto out;
3085: }
3086: cp += MARK_BEGIN_LEN;
3087: encoded_len -= MARK_BEGIN_LEN;
3088:
3089: /* Look for end marker, removing whitespace as we go */
3090: while (encoded_len > 0) {
3091: if (*cp != '\n' && *cp != '\r') {
3092: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3093: goto out;
3094: }
3095: last = *cp;
3096: encoded_len--;
3097: cp++;
3098: if (last == '\n') {
3099: if (encoded_len >= MARK_END_LEN &&
3100: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3101: /* \0 terminate */
3102: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3103: goto out;
3104: break;
3105: }
3106: }
3107: }
3108: if (encoded_len == 0) {
3109: r = SSH_ERR_INVALID_FORMAT;
3110: goto out;
3111: }
3112:
3113: /* decode base64 */
1.4 ! djm 3114: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3115: goto out;
3116:
3117: /* check magic */
3118: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3119: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3120: r = SSH_ERR_INVALID_FORMAT;
3121: goto out;
3122: }
3123: /* parse public portion of key */
3124: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3125: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3126: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3127: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3128: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3129: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3130: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3131: goto out;
3132:
3133: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3134: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3135: goto out;
3136: }
3137: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3138: strcmp(ciphername, "none") != 0) {
3139: /* passphrase required */
3140: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3141: goto out;
3142: }
3143: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3144: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3145: goto out;
3146: }
3147: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3148: r = SSH_ERR_INVALID_FORMAT;
3149: goto out;
3150: }
3151: if (nkeys != 1) {
3152: /* XXX only one key supported */
3153: r = SSH_ERR_INVALID_FORMAT;
3154: goto out;
3155: }
3156:
3157: /* check size of encrypted key blob */
3158: blocksize = cipher_blocksize(cipher);
3159: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3160: r = SSH_ERR_INVALID_FORMAT;
3161: goto out;
3162: }
3163:
3164: /* setup key */
3165: keylen = cipher_keylen(cipher);
3166: ivlen = cipher_ivlen(cipher);
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:
3182: /* decrypt private portion of key */
3183: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3184: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3185: key + keylen, ivlen, 0)) != 0)
3186: goto out;
3187: if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3188: sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 0) {
3189: /* an integrity error here indicates an incorrect passphrase */
3190: if (r == SSH_ERR_MAC_INVALID)
3191: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3192: goto out;
3193: }
3194: if ((r = sshbuf_consume(decoded, encrypted_len)) != 0)
3195: goto out;
3196: /* there should be no trailing data */
3197: if (sshbuf_len(decoded) != 0) {
3198: r = SSH_ERR_INVALID_FORMAT;
3199: goto out;
3200: }
3201:
3202: /* check check bytes */
3203: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3204: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3205: goto out;
3206: if (check1 != check2) {
3207: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3208: goto out;
3209: }
3210:
3211: /* Load the private key and comment */
3212: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3213: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3214: goto out;
3215:
3216: /* Check deterministic padding */
3217: i = 0;
3218: while (sshbuf_len(decrypted)) {
3219: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3220: goto out;
3221: if (pad != (++i & 0xff)) {
3222: r = SSH_ERR_INVALID_FORMAT;
3223: goto out;
3224: }
3225: }
3226:
3227: /* XXX decode pubkey and check against private */
3228:
3229: /* success */
3230: r = 0;
3231: if (keyp != NULL) {
3232: *keyp = k;
3233: k = NULL;
3234: }
3235: if (commentp != NULL) {
3236: *commentp = comment;
3237: comment = NULL;
3238: }
3239: out:
3240: pad = 0;
3241: cipher_cleanup(&ciphercontext);
3242: free(ciphername);
3243: free(kdfname);
3244: free(comment);
3245: if (salt != NULL) {
3246: explicit_bzero(salt, slen);
3247: free(salt);
3248: }
3249: if (key != NULL) {
3250: explicit_bzero(key, keylen + ivlen);
3251: free(key);
3252: }
3253: sshbuf_free(encoded);
3254: sshbuf_free(decoded);
3255: sshbuf_free(kdf);
3256: sshbuf_free(decrypted);
3257: sshkey_free(k);
3258: return r;
3259: }
3260:
3261: #if WITH_SSH1
3262: /*
3263: * Serialises the authentication (private) key to a blob, encrypting it with
3264: * passphrase. The identification of the blob (lowest 64 bits of n) will
3265: * precede the key to provide identification of the key without needing a
3266: * passphrase.
3267: */
3268: static int
3269: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3270: const char *passphrase, const char *comment)
3271: {
3272: struct sshbuf *buffer = NULL, *encrypted = NULL;
3273: u_char buf[8];
3274: int r, cipher_num;
3275: struct sshcipher_ctx ciphercontext;
3276: const struct sshcipher *cipher;
3277: u_char *cp;
3278:
3279: /*
3280: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3281: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3282: */
3283: cipher_num = (strcmp(passphrase, "") == 0) ?
3284: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3285: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3286: return SSH_ERR_INTERNAL_ERROR;
3287:
3288: /* This buffer is used to build the secret part of the private key. */
3289: if ((buffer = sshbuf_new()) == NULL)
3290: return SSH_ERR_ALLOC_FAIL;
3291:
3292: /* Put checkbytes for checking passphrase validity. */
3293: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3294: goto out;
3295: arc4random_buf(cp, 2);
3296: memcpy(cp + 2, cp, 2);
3297:
3298: /*
3299: * Store the private key (n and e will not be stored because they
3300: * will be stored in plain text, and storing them also in encrypted
3301: * format would just give known plaintext).
3302: * Note: q and p are stored in reverse order to SSL.
3303: */
3304: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3305: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3306: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3307: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3308: goto out;
3309:
3310: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3311: explicit_bzero(buf, 8);
3312: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3313: goto out;
3314:
3315: /* This buffer will be used to contain the data in the file. */
3316: if ((encrypted = sshbuf_new()) == NULL) {
3317: r = SSH_ERR_ALLOC_FAIL;
3318: goto out;
3319: }
3320:
3321: /* First store keyfile id string. */
3322: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3323: sizeof(LEGACY_BEGIN))) != 0)
3324: goto out;
3325:
3326: /* Store cipher type and "reserved" field. */
3327: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3328: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3329: goto out;
3330:
3331: /* Store public key. This will be in plain text. */
3332: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3333: (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3334: (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3335: (r = sshbuf_put_cstring(encrypted, comment) != 0))
3336: goto out;
3337:
3338: /* Allocate space for the private part of the key in the buffer. */
3339: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3340: goto out;
3341:
3342: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3343: CIPHER_ENCRYPT)) != 0)
3344: goto out;
3345: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3346: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3347: goto out;
3348: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3349: goto out;
3350:
3351: r = sshbuf_putb(blob, encrypted);
3352:
3353: out:
3354: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3355: explicit_bzero(buf, sizeof(buf));
3356: if (buffer != NULL)
3357: sshbuf_free(buffer);
3358: if (encrypted != NULL)
3359: sshbuf_free(encrypted);
3360:
3361: return r;
3362: }
3363: #endif /* WITH_SSH1 */
3364:
3365: #ifdef WITH_OPENSSL
3366: /* convert SSH v2 key in OpenSSL PEM format */
3367: static int
3368: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3369: const char *_passphrase, const char *comment)
3370: {
3371: int success, r;
3372: int blen, len = strlen(_passphrase);
3373: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3374: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3375: const u_char *bptr;
3376: BIO *bio = NULL;
3377:
3378: if (len > 0 && len <= 4)
3379: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3380: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3381: return SSH_ERR_ALLOC_FAIL;
3382:
3383: switch (key->type) {
3384: case KEY_DSA:
3385: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3386: cipher, passphrase, len, NULL, NULL);
3387: break;
3388: case KEY_ECDSA:
3389: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3390: cipher, passphrase, len, NULL, NULL);
3391: break;
3392: case KEY_RSA:
3393: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3394: cipher, passphrase, len, NULL, NULL);
3395: break;
3396: default:
3397: success = 0;
3398: break;
3399: }
3400: if (success == 0) {
3401: r = SSH_ERR_LIBCRYPTO_ERROR;
3402: goto out;
3403: }
3404: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3405: r = SSH_ERR_INTERNAL_ERROR;
3406: goto out;
3407: }
3408: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3409: goto out;
3410: r = 0;
3411: out:
3412: BIO_free(bio);
3413: return r;
3414: }
3415: #endif /* WITH_OPENSSL */
3416:
3417: /* Serialise "key" to buffer "blob" */
3418: int
3419: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3420: const char *passphrase, const char *comment,
3421: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3422: {
3423: switch (key->type) {
3424: #ifdef WITH_OPENSSL
3425: case KEY_RSA1:
3426: return sshkey_private_rsa1_to_blob(key, blob,
3427: passphrase, comment);
3428: case KEY_DSA:
3429: case KEY_ECDSA:
3430: case KEY_RSA:
3431: if (force_new_format) {
3432: return sshkey_private_to_blob2(key, blob, passphrase,
3433: comment, new_format_cipher, new_format_rounds);
3434: }
3435: return sshkey_private_pem_to_blob(key, blob,
3436: passphrase, comment);
3437: #endif /* WITH_OPENSSL */
3438: case KEY_ED25519:
3439: return sshkey_private_to_blob2(key, blob, passphrase,
3440: comment, new_format_cipher, new_format_rounds);
3441: default:
3442: return SSH_ERR_KEY_TYPE_UNKNOWN;
3443: }
3444: }
3445:
3446: #ifdef WITH_SSH1
3447: /*
3448: * Parse the public, unencrypted portion of a RSA1 key.
3449: */
3450: int
3451: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3452: struct sshkey **keyp, char **commentp)
3453: {
3454: int r;
3455: struct sshkey *pub = NULL;
3456: struct sshbuf *copy = NULL;
3457:
3458: if (keyp != NULL)
3459: *keyp = NULL;
3460: if (commentp != NULL)
3461: *commentp = NULL;
3462:
3463: /* Check that it is at least big enough to contain the ID string. */
3464: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3465: return SSH_ERR_INVALID_FORMAT;
3466:
3467: /*
3468: * Make sure it begins with the id string. Consume the id string
3469: * from the buffer.
3470: */
3471: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3472: return SSH_ERR_INVALID_FORMAT;
3473: /* Make a working copy of the keyblob and skip past the magic */
3474: if ((copy = sshbuf_fromb(blob)) == NULL)
3475: return SSH_ERR_ALLOC_FAIL;
3476: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3477: goto out;
3478:
3479: /* Skip cipher type, reserved data and key bits. */
3480: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3481: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3482: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3483: goto out;
3484:
3485: /* Read the public key from the buffer. */
3486: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3487: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3488: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3489: goto out;
3490:
3491: /* Finally, the comment */
3492: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3493: goto out;
3494:
3495: /* The encrypted private part is not parsed by this function. */
3496:
3497: r = 0;
3498: if (keyp != NULL)
3499: *keyp = pub;
3500: else
3501: sshkey_free(pub);
3502: pub = NULL;
3503:
3504: out:
3505: if (copy != NULL)
3506: sshbuf_free(copy);
3507: if (pub != NULL)
3508: sshkey_free(pub);
3509: return r;
3510: }
3511:
3512: static int
3513: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3514: struct sshkey **keyp, char **commentp)
3515: {
3516: int r;
3517: u_int16_t check1, check2;
3518: u_int8_t cipher_type;
3519: struct sshbuf *decrypted = NULL, *copy = NULL;
3520: u_char *cp;
3521: char *comment = NULL;
3522: struct sshcipher_ctx ciphercontext;
3523: const struct sshcipher *cipher;
3524: struct sshkey *prv = NULL;
3525:
3526: *keyp = NULL;
3527: if (commentp != NULL)
3528: *commentp = NULL;
3529:
3530: /* Check that it is at least big enough to contain the ID string. */
3531: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3532: return SSH_ERR_INVALID_FORMAT;
3533:
3534: /*
3535: * Make sure it begins with the id string. Consume the id string
3536: * from the buffer.
3537: */
3538: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3539: return SSH_ERR_INVALID_FORMAT;
3540:
3541: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3542: r = SSH_ERR_ALLOC_FAIL;
3543: goto out;
3544: }
3545: if ((copy = sshbuf_fromb(blob)) == NULL ||
3546: (decrypted = sshbuf_new()) == NULL) {
3547: r = SSH_ERR_ALLOC_FAIL;
3548: goto out;
3549: }
3550: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3551: goto out;
3552:
3553: /* Read cipher type. */
3554: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3555: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3556: goto out;
3557:
3558: /* Read the public key and comment from the buffer. */
3559: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3560: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3561: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3562: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3563: goto out;
3564:
3565: /* Check that it is a supported cipher. */
3566: cipher = cipher_by_number(cipher_type);
3567: if (cipher == NULL) {
3568: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3569: goto out;
3570: }
3571: /* Initialize space for decrypted data. */
3572: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3573: goto out;
3574:
3575: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3576: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3577: CIPHER_DECRYPT)) != 0)
3578: goto out;
3579: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3580: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3581: cipher_cleanup(&ciphercontext);
3582: goto out;
3583: }
3584: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3585: goto out;
3586:
3587: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3588: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3589: goto out;
3590: if (check1 != check2) {
3591: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3592: goto out;
3593: }
3594:
3595: /* Read the rest of the private key. */
3596: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3597: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3598: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3599: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3600: goto out;
3601:
3602: /* calculate p-1 and q-1 */
3603: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3604: goto out;
3605:
3606: /* enable blinding */
3607: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3608: r = SSH_ERR_LIBCRYPTO_ERROR;
3609: goto out;
3610: }
3611: r = 0;
3612: *keyp = prv;
3613: prv = NULL;
3614: if (commentp != NULL) {
3615: *commentp = comment;
3616: comment = NULL;
3617: }
3618: out:
3619: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3620: if (comment != NULL)
3621: free(comment);
3622: if (prv != NULL)
3623: sshkey_free(prv);
3624: if (copy != NULL)
3625: sshbuf_free(copy);
3626: if (decrypted != NULL)
3627: sshbuf_free(decrypted);
3628: return r;
3629: }
3630: #endif /* WITH_SSH1 */
3631:
3632: #ifdef WITH_OPENSSL
3633: /* XXX make private once ssh-keysign.c fixed */
3634: int
3635: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3636: const char *passphrase, struct sshkey **keyp, char **commentp)
3637: {
3638: EVP_PKEY *pk = NULL;
3639: struct sshkey *prv = NULL;
3640: char *name = "<no key>";
3641: BIO *bio = NULL;
3642: int r;
3643:
3644: *keyp = NULL;
3645: if (commentp != NULL)
3646: *commentp = NULL;
3647:
3648: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3649: return SSH_ERR_ALLOC_FAIL;
3650: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3651: (int)sshbuf_len(blob)) {
3652: r = SSH_ERR_ALLOC_FAIL;
3653: goto out;
3654: }
3655:
3656: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3657: (char *)passphrase)) == NULL) {
3658: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3659: goto out;
3660: }
3661: if (pk->type == EVP_PKEY_RSA &&
3662: (type == KEY_UNSPEC || type == KEY_RSA)) {
3663: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3664: r = SSH_ERR_ALLOC_FAIL;
3665: goto out;
3666: }
3667: prv->rsa = EVP_PKEY_get1_RSA(pk);
3668: prv->type = KEY_RSA;
3669: name = "rsa w/o comment";
3670: #ifdef DEBUG_PK
3671: RSA_print_fp(stderr, prv->rsa, 8);
3672: #endif
3673: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3674: r = SSH_ERR_LIBCRYPTO_ERROR;
3675: goto out;
3676: }
3677: } else if (pk->type == EVP_PKEY_DSA &&
3678: (type == KEY_UNSPEC || type == KEY_DSA)) {
3679: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3680: r = SSH_ERR_ALLOC_FAIL;
3681: goto out;
3682: }
3683: prv->dsa = EVP_PKEY_get1_DSA(pk);
3684: prv->type = KEY_DSA;
3685: name = "dsa w/o comment";
3686: #ifdef DEBUG_PK
3687: DSA_print_fp(stderr, prv->dsa, 8);
3688: #endif
3689: } else if (pk->type == EVP_PKEY_EC &&
3690: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3691: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3692: r = SSH_ERR_ALLOC_FAIL;
3693: goto out;
3694: }
3695: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3696: prv->type = KEY_ECDSA;
3697: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3698: if (prv->ecdsa_nid == -1 ||
3699: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3700: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3701: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3702: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3703: r = SSH_ERR_INVALID_FORMAT;
3704: goto out;
3705: }
3706: name = "ecdsa w/o comment";
3707: #ifdef DEBUG_PK
3708: if (prv != NULL && prv->ecdsa != NULL)
3709: sshkey_dump_ec_key(prv->ecdsa);
3710: #endif
3711: } else {
3712: r = SSH_ERR_INVALID_FORMAT;
3713: goto out;
3714: }
3715: if (commentp != NULL &&
3716: (*commentp = strdup(name)) == NULL) {
3717: r = SSH_ERR_ALLOC_FAIL;
3718: goto out;
3719: }
3720: r = 0;
3721: *keyp = prv;
3722: prv = NULL;
3723: out:
3724: BIO_free(bio);
3725: if (pk != NULL)
3726: EVP_PKEY_free(pk);
3727: if (prv != NULL)
3728: sshkey_free(prv);
3729: return r;
3730: }
3731: #endif /* WITH_OPENSSL */
3732:
3733: int
3734: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3735: const char *passphrase, struct sshkey **keyp, char **commentp)
3736: {
3737: int r;
3738:
3739: *keyp = NULL;
3740: if (commentp != NULL)
3741: *commentp = NULL;
3742:
3743: switch (type) {
3744: #ifdef WITH_OPENSSL
3745: case KEY_RSA1:
3746: return sshkey_parse_private_rsa1(blob, passphrase,
3747: keyp, commentp);
3748: case KEY_DSA:
3749: case KEY_ECDSA:
3750: case KEY_RSA:
3751: return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3752: keyp, commentp);
3753: #endif /* WITH_OPENSSL */
3754: case KEY_ED25519:
3755: return sshkey_parse_private2(blob, type, passphrase,
3756: keyp, commentp);
3757: case KEY_UNSPEC:
3758: if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3759: commentp)) == 0)
3760: return 0;
3761: #ifdef WITH_OPENSSL
3762: return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3763: keyp, commentp);
3764: #else
3765: return SSH_ERR_INVALID_FORMAT;
3766: #endif /* WITH_OPENSSL */
3767: default:
3768: return SSH_ERR_KEY_TYPE_UNKNOWN;
3769: }
3770: }
3771:
3772: int
3773: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3774: const char *filename, struct sshkey **keyp, char **commentp)
3775: {
3776: int r;
3777:
3778: if (keyp != NULL)
3779: *keyp = NULL;
3780: if (commentp != NULL)
3781: *commentp = NULL;
3782:
3783: #ifdef WITH_SSH1
3784: /* it's a SSH v1 key if the public key part is readable */
3785: if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3786: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3787: passphrase, keyp, commentp);
3788: }
3789: #endif /* WITH_SSH1 */
1.2 markus 3790: if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3791: passphrase, keyp, commentp)) == 0)
3792: return 0;
1.1 djm 3793: return r;
3794: }
![[BACK]](/icons/back.gif){kind=icon}
Return to sshkey.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh