Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.6
1.6 ! djm 1: /* $OpenBSD: sshkey.c,v 1.5 2014/11/18 01:02:25 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;
1.5 djm 1210: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1211: return SSH_ERR_KEY_TYPE_MISMATCH;
1212: if ((blob = sshbuf_new()) == NULL)
1213: return SSH_ERR_ALLOC_FAIL;
1214: /* trim comment */
1215: space = strchr(cp, ' ');
1216: if (space)
1217: *space = '\0';
1218: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1219: sshbuf_free(blob);
1220: return r;
1221: }
1222: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1223: sshbuf_len(blob), &k)) != 0) {
1224: sshbuf_free(blob);
1225: return r;
1226: }
1227: sshbuf_free(blob);
1228: if (k->type != type) {
1229: sshkey_free(k);
1230: return SSH_ERR_KEY_TYPE_MISMATCH;
1231: }
1232: if (sshkey_type_plain(type) == KEY_ECDSA &&
1233: curve_nid != k->ecdsa_nid) {
1234: sshkey_free(k);
1235: return SSH_ERR_EC_CURVE_MISMATCH;
1236: }
1.5 djm 1237: ret->type = type;
1.1 djm 1238: if (sshkey_is_cert(ret)) {
1239: if (!sshkey_is_cert(k)) {
1240: sshkey_free(k);
1241: return SSH_ERR_EXPECTED_CERT;
1242: }
1243: if (ret->cert != NULL)
1244: cert_free(ret->cert);
1245: ret->cert = k->cert;
1246: k->cert = NULL;
1247: }
1248: #ifdef WITH_OPENSSL
1249: if (sshkey_type_plain(ret->type) == KEY_RSA) {
1250: if (ret->rsa != NULL)
1251: RSA_free(ret->rsa);
1252: ret->rsa = k->rsa;
1253: k->rsa = NULL;
1254: #ifdef DEBUG_PK
1255: RSA_print_fp(stderr, ret->rsa, 8);
1256: #endif
1257: }
1258: if (sshkey_type_plain(ret->type) == KEY_DSA) {
1259: if (ret->dsa != NULL)
1260: DSA_free(ret->dsa);
1261: ret->dsa = k->dsa;
1262: k->dsa = NULL;
1263: #ifdef DEBUG_PK
1264: DSA_print_fp(stderr, ret->dsa, 8);
1265: #endif
1266: }
1267: if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1268: if (ret->ecdsa != NULL)
1269: EC_KEY_free(ret->ecdsa);
1270: ret->ecdsa = k->ecdsa;
1271: ret->ecdsa_nid = k->ecdsa_nid;
1272: k->ecdsa = NULL;
1273: k->ecdsa_nid = -1;
1274: #ifdef DEBUG_PK
1275: sshkey_dump_ec_key(ret->ecdsa);
1276: #endif
1277: }
1278: #endif /* WITH_OPENSSL */
1279: if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1280: free(ret->ed25519_pk);
1281: ret->ed25519_pk = k->ed25519_pk;
1282: k->ed25519_pk = NULL;
1283: #ifdef DEBUG_PK
1284: /* XXX */
1285: #endif
1286: }
1287: retval = 0;
1288: /*XXXX*/
1289: sshkey_free(k);
1290: if (retval != 0)
1291: break;
1292: /* advance cp: skip whitespace and data */
1293: while (*cp == ' ' || *cp == '\t')
1294: cp++;
1295: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
1296: cp++;
1297: *cpp = cp;
1298: break;
1299: default:
1300: return SSH_ERR_INVALID_ARGUMENT;
1301: }
1302: return retval;
1303: }
1304:
1305: int
1306: sshkey_write(const struct sshkey *key, FILE *f)
1307: {
1308: int ret = SSH_ERR_INTERNAL_ERROR;
1309: struct sshbuf *b = NULL, *bb = NULL;
1310: char *uu = NULL;
1311: #ifdef WITH_SSH1
1312: u_int bits = 0;
1313: char *dec_e = NULL, *dec_n = NULL;
1314: #endif /* WITH_SSH1 */
1315:
1316: if (sshkey_is_cert(key)) {
1317: if (key->cert == NULL)
1318: return SSH_ERR_EXPECTED_CERT;
1319: if (sshbuf_len(key->cert->certblob) == 0)
1320: return SSH_ERR_KEY_LACKS_CERTBLOB;
1321: }
1322: if ((b = sshbuf_new()) == NULL)
1323: return SSH_ERR_ALLOC_FAIL;
1324: switch (key->type) {
1325: #ifdef WITH_SSH1
1326: case KEY_RSA1:
1327: if (key->rsa == NULL || key->rsa->e == NULL ||
1328: key->rsa->n == NULL) {
1329: ret = SSH_ERR_INVALID_ARGUMENT;
1330: goto out;
1331: }
1332: if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1333: (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1334: ret = SSH_ERR_ALLOC_FAIL;
1335: goto out;
1336: }
1337: /* size of modulus 'n' */
1338: if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1339: ret = SSH_ERR_INVALID_ARGUMENT;
1340: goto out;
1341: }
1342: if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1343: goto out;
1344: #endif /* WITH_SSH1 */
1345: break;
1346: #ifdef WITH_OPENSSL
1347: case KEY_DSA:
1348: case KEY_DSA_CERT_V00:
1349: case KEY_DSA_CERT:
1350: case KEY_ECDSA:
1351: case KEY_ECDSA_CERT:
1352: case KEY_RSA:
1353: case KEY_RSA_CERT_V00:
1354: case KEY_RSA_CERT:
1355: #endif /* WITH_OPENSSL */
1356: case KEY_ED25519:
1357: case KEY_ED25519_CERT:
1358: if ((bb = sshbuf_new()) == NULL) {
1359: ret = SSH_ERR_ALLOC_FAIL;
1360: goto out;
1361: }
1362: if ((ret = sshkey_to_blob_buf(key, bb)) != 0)
1363: goto out;
1364: if ((uu = sshbuf_dtob64(bb)) == NULL) {
1365: ret = SSH_ERR_ALLOC_FAIL;
1366: goto out;
1367: }
1368: if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
1369: goto out;
1370: if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
1371: goto out;
1372: break;
1373: default:
1374: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1375: goto out;
1376: }
1377: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1378: if (feof(f))
1379: errno = EPIPE;
1380: ret = SSH_ERR_SYSTEM_ERROR;
1381: goto out;
1382: }
1383: ret = 0;
1384: out:
1385: if (b != NULL)
1386: sshbuf_free(b);
1387: if (bb != NULL)
1388: sshbuf_free(bb);
1389: if (uu != NULL)
1390: free(uu);
1391: #ifdef WITH_SSH1
1392: if (dec_e != NULL)
1393: OPENSSL_free(dec_e);
1394: if (dec_n != NULL)
1395: OPENSSL_free(dec_n);
1396: #endif /* WITH_SSH1 */
1397: return ret;
1398: }
1399:
1400: const char *
1401: sshkey_cert_type(const struct sshkey *k)
1402: {
1403: switch (k->cert->type) {
1404: case SSH2_CERT_TYPE_USER:
1405: return "user";
1406: case SSH2_CERT_TYPE_HOST:
1407: return "host";
1408: default:
1409: return "unknown";
1410: }
1411: }
1412:
1413: #ifdef WITH_OPENSSL
1414: static int
1415: rsa_generate_private_key(u_int bits, RSA **rsap)
1416: {
1417: RSA *private = NULL;
1418: BIGNUM *f4 = NULL;
1419: int ret = SSH_ERR_INTERNAL_ERROR;
1420:
1421: if (rsap == NULL ||
1422: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1423: bits > SSHBUF_MAX_BIGNUM * 8)
1424: return SSH_ERR_INVALID_ARGUMENT;
1425: *rsap = NULL;
1426: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1427: ret = SSH_ERR_ALLOC_FAIL;
1428: goto out;
1429: }
1430: if (!BN_set_word(f4, RSA_F4) ||
1431: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1432: ret = SSH_ERR_LIBCRYPTO_ERROR;
1433: goto out;
1434: }
1435: *rsap = private;
1436: private = NULL;
1437: ret = 0;
1438: out:
1439: if (private != NULL)
1440: RSA_free(private);
1441: if (f4 != NULL)
1442: BN_free(f4);
1443: return ret;
1444: }
1445:
1446: static int
1447: dsa_generate_private_key(u_int bits, DSA **dsap)
1448: {
1449: DSA *private;
1450: int ret = SSH_ERR_INTERNAL_ERROR;
1451:
1452: if (dsap == NULL || bits != 1024)
1453: return SSH_ERR_INVALID_ARGUMENT;
1454: if ((private = DSA_new()) == NULL) {
1455: ret = SSH_ERR_ALLOC_FAIL;
1456: goto out;
1457: }
1458: *dsap = NULL;
1459: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1460: NULL, NULL) || !DSA_generate_key(private)) {
1461: DSA_free(private);
1462: ret = SSH_ERR_LIBCRYPTO_ERROR;
1463: goto out;
1464: }
1465: *dsap = private;
1466: private = NULL;
1467: ret = 0;
1468: out:
1469: if (private != NULL)
1470: DSA_free(private);
1471: return ret;
1472: }
1473:
1474: int
1475: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1476: {
1477: EC_GROUP *eg;
1478: int nids[] = {
1479: NID_X9_62_prime256v1,
1480: NID_secp384r1,
1481: NID_secp521r1,
1482: -1
1483: };
1484: int nid;
1485: u_int i;
1486: BN_CTX *bnctx;
1487: const EC_GROUP *g = EC_KEY_get0_group(k);
1488:
1489: /*
1490: * The group may be stored in a ASN.1 encoded private key in one of two
1491: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1492: * or explicit group parameters encoded into the key blob. Only the
1493: * "named group" case sets the group NID for us, but we can figure
1494: * it out for the other case by comparing against all the groups that
1495: * are supported.
1496: */
1497: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1498: return nid;
1499: if ((bnctx = BN_CTX_new()) == NULL)
1500: return -1;
1501: for (i = 0; nids[i] != -1; i++) {
1502: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1503: BN_CTX_free(bnctx);
1504: return -1;
1505: }
1506: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1507: break;
1508: EC_GROUP_free(eg);
1509: }
1510: BN_CTX_free(bnctx);
1511: if (nids[i] != -1) {
1512: /* Use the group with the NID attached */
1513: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1514: if (EC_KEY_set_group(k, eg) != 1) {
1515: EC_GROUP_free(eg);
1516: return -1;
1517: }
1518: }
1519: return nids[i];
1520: }
1521:
1522: static int
1523: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1524: {
1525: EC_KEY *private;
1526: int ret = SSH_ERR_INTERNAL_ERROR;
1527:
1528: if (nid == NULL || ecdsap == NULL ||
1529: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1530: return SSH_ERR_INVALID_ARGUMENT;
1531: *ecdsap = NULL;
1532: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1533: ret = SSH_ERR_ALLOC_FAIL;
1534: goto out;
1535: }
1536: if (EC_KEY_generate_key(private) != 1) {
1537: ret = SSH_ERR_LIBCRYPTO_ERROR;
1538: goto out;
1539: }
1540: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1541: *ecdsap = private;
1542: private = NULL;
1543: ret = 0;
1544: out:
1545: if (private != NULL)
1546: EC_KEY_free(private);
1547: return ret;
1548: }
1549: #endif /* WITH_OPENSSL */
1550:
1551: int
1552: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1553: {
1554: struct sshkey *k;
1555: int ret = SSH_ERR_INTERNAL_ERROR;
1556:
1557: if (keyp == NULL)
1558: return SSH_ERR_INVALID_ARGUMENT;
1559: *keyp = NULL;
1560: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1561: return SSH_ERR_ALLOC_FAIL;
1562: switch (type) {
1563: case KEY_ED25519:
1564: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1565: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1566: ret = SSH_ERR_ALLOC_FAIL;
1567: break;
1568: }
1569: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1570: ret = 0;
1571: break;
1572: #ifdef WITH_OPENSSL
1573: case KEY_DSA:
1574: ret = dsa_generate_private_key(bits, &k->dsa);
1575: break;
1576: case KEY_ECDSA:
1577: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1578: &k->ecdsa);
1579: break;
1580: case KEY_RSA:
1581: case KEY_RSA1:
1582: ret = rsa_generate_private_key(bits, &k->rsa);
1583: break;
1584: #endif /* WITH_OPENSSL */
1585: default:
1586: ret = SSH_ERR_INVALID_ARGUMENT;
1587: }
1588: if (ret == 0) {
1589: k->type = type;
1590: *keyp = k;
1591: } else
1592: sshkey_free(k);
1593: return ret;
1594: }
1595:
1596: int
1597: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1598: {
1599: u_int i;
1600: const struct sshkey_cert *from;
1601: struct sshkey_cert *to;
1602: int ret = SSH_ERR_INTERNAL_ERROR;
1603:
1604: if (to_key->cert != NULL) {
1605: cert_free(to_key->cert);
1606: to_key->cert = NULL;
1607: }
1608:
1609: if ((from = from_key->cert) == NULL)
1610: return SSH_ERR_INVALID_ARGUMENT;
1611:
1612: if ((to = to_key->cert = cert_new()) == NULL)
1613: return SSH_ERR_ALLOC_FAIL;
1614:
1615: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1616: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1617: (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1618: return ret;
1619:
1620: to->serial = from->serial;
1621: to->type = from->type;
1622: if (from->key_id == NULL)
1623: to->key_id = NULL;
1624: else if ((to->key_id = strdup(from->key_id)) == NULL)
1625: return SSH_ERR_ALLOC_FAIL;
1626: to->valid_after = from->valid_after;
1627: to->valid_before = from->valid_before;
1628: if (from->signature_key == NULL)
1629: to->signature_key = NULL;
1630: else if ((ret = sshkey_from_private(from->signature_key,
1631: &to->signature_key)) != 0)
1632: return ret;
1633:
1634: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1635: return SSH_ERR_INVALID_ARGUMENT;
1636: if (from->nprincipals > 0) {
1637: if ((to->principals = calloc(from->nprincipals,
1638: sizeof(*to->principals))) == NULL)
1639: return SSH_ERR_ALLOC_FAIL;
1640: for (i = 0; i < from->nprincipals; i++) {
1641: to->principals[i] = strdup(from->principals[i]);
1642: if (to->principals[i] == NULL) {
1643: to->nprincipals = i;
1644: return SSH_ERR_ALLOC_FAIL;
1645: }
1646: }
1647: }
1648: to->nprincipals = from->nprincipals;
1649: return 0;
1650: }
1651:
1652: int
1653: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1654: {
1655: struct sshkey *n = NULL;
1656: int ret = SSH_ERR_INTERNAL_ERROR;
1657:
1658: if (pkp != NULL)
1659: *pkp = NULL;
1660:
1661: switch (k->type) {
1662: #ifdef WITH_OPENSSL
1663: case KEY_DSA:
1664: case KEY_DSA_CERT_V00:
1665: case KEY_DSA_CERT:
1666: if ((n = sshkey_new(k->type)) == NULL)
1667: return SSH_ERR_ALLOC_FAIL;
1668: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1669: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1670: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1671: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1672: sshkey_free(n);
1673: return SSH_ERR_ALLOC_FAIL;
1674: }
1675: break;
1676: case KEY_ECDSA:
1677: case KEY_ECDSA_CERT:
1678: if ((n = sshkey_new(k->type)) == NULL)
1679: return SSH_ERR_ALLOC_FAIL;
1680: n->ecdsa_nid = k->ecdsa_nid;
1681: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1682: if (n->ecdsa == NULL) {
1683: sshkey_free(n);
1684: return SSH_ERR_ALLOC_FAIL;
1685: }
1686: if (EC_KEY_set_public_key(n->ecdsa,
1687: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1688: sshkey_free(n);
1689: return SSH_ERR_LIBCRYPTO_ERROR;
1690: }
1691: break;
1692: case KEY_RSA:
1693: case KEY_RSA1:
1694: case KEY_RSA_CERT_V00:
1695: case KEY_RSA_CERT:
1696: if ((n = sshkey_new(k->type)) == NULL)
1697: return SSH_ERR_ALLOC_FAIL;
1698: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1699: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1700: sshkey_free(n);
1701: return SSH_ERR_ALLOC_FAIL;
1702: }
1703: break;
1704: #endif /* WITH_OPENSSL */
1705: case KEY_ED25519:
1706: case KEY_ED25519_CERT:
1707: if ((n = sshkey_new(k->type)) == NULL)
1708: return SSH_ERR_ALLOC_FAIL;
1709: if (k->ed25519_pk != NULL) {
1710: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1711: sshkey_free(n);
1712: return SSH_ERR_ALLOC_FAIL;
1713: }
1714: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1715: }
1716: break;
1717: default:
1718: return SSH_ERR_KEY_TYPE_UNKNOWN;
1719: }
1720: if (sshkey_is_cert(k)) {
1721: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1722: sshkey_free(n);
1723: return ret;
1724: }
1725: }
1726: *pkp = n;
1727: return 0;
1728: }
1729:
1730: static int
1731: cert_parse(struct sshbuf *b, struct sshkey *key, const u_char *blob,
1732: size_t blen)
1733: {
1.4 djm 1734: struct sshbuf *principals = NULL, *crit = NULL, *exts = NULL;
1.1 djm 1735: u_char *sig_key = NULL, *sig = NULL;
1.4 djm 1736: size_t signed_len = 0, sklen = 0, slen = 0, kidlen = 0;
1.1 djm 1737: int ret = SSH_ERR_INTERNAL_ERROR;
1738: int v00 = sshkey_cert_is_legacy(key);
1739:
1740: /* Copy the entire key blob for verification and later serialisation */
1741: if ((ret = sshbuf_put(key->cert->certblob, blob, blen)) != 0)
1742: return ret;
1743:
1744: if ((!v00 && (ret = sshbuf_get_u64(b, &key->cert->serial)) != 0) ||
1745: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1746: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1747: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1748: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1749: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1750: (ret = sshbuf_froms(b, &crit)) != 0 ||
1751: (!v00 && (ret = sshbuf_froms(b, &exts)) != 0) ||
1.1 djm 1752: (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
1753: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1754: (ret = sshbuf_get_string(b, &sig_key, &sklen)) != 0) {
1755: /* XXX debug print error for ret */
1756: ret = SSH_ERR_INVALID_FORMAT;
1757: goto out;
1758: }
1759:
1760: /* Signature is left in the buffer so we can calculate this length */
1761: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1762:
1763: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1764: ret = SSH_ERR_INVALID_FORMAT;
1765: goto out;
1766: }
1767:
1768: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1769: key->cert->type != SSH2_CERT_TYPE_HOST) {
1770: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1771: goto out;
1772: }
1773:
1.4 djm 1774: /* Parse principals section */
1775: while (sshbuf_len(principals) > 0) {
1776: char *principal = NULL;
1777: char **oprincipals = NULL;
1778:
1.1 djm 1779: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1780: ret = SSH_ERR_INVALID_FORMAT;
1781: goto out;
1782: }
1.4 djm 1783: if ((ret = sshbuf_get_cstring(principals, &principal,
1784: NULL)) != 0) {
1.1 djm 1785: ret = SSH_ERR_INVALID_FORMAT;
1786: goto out;
1787: }
1788: oprincipals = key->cert->principals;
1789: key->cert->principals = realloc(key->cert->principals,
1790: (key->cert->nprincipals + 1) *
1791: sizeof(*key->cert->principals));
1792: if (key->cert->principals == NULL) {
1793: free(principal);
1794: key->cert->principals = oprincipals;
1795: ret = SSH_ERR_ALLOC_FAIL;
1796: goto out;
1797: }
1798: key->cert->principals[key->cert->nprincipals++] = principal;
1799: }
1800:
1.4 djm 1801: /*
1802: * Stash a copies of the critical options and extensions sections
1803: * for later use.
1804: */
1805: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1806: (exts != NULL &&
1807: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1808: goto out;
1809:
1.4 djm 1810: /*
1811: * Validate critical options and extensions sections format.
1812: * NB. extensions are not present in v00 certs.
1813: */
1814: while (sshbuf_len(crit) != 0) {
1815: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1816: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1817: sshbuf_reset(key->cert->critical);
1.1 djm 1818: ret = SSH_ERR_INVALID_FORMAT;
1819: goto out;
1820: }
1821: }
1.4 djm 1822: while (exts != NULL && sshbuf_len(exts) != 0) {
1823: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1824: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1825: sshbuf_reset(key->cert->extensions);
1.1 djm 1826: ret = SSH_ERR_INVALID_FORMAT;
1827: goto out;
1828: }
1829: }
1830:
1.4 djm 1831: /* Parse CA key and check signature */
1.1 djm 1832: if (sshkey_from_blob_internal(sig_key, sklen,
1833: &key->cert->signature_key, 0) != 0) {
1834: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1835: goto out;
1836: }
1837: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1838: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1839: goto out;
1840: }
1841: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1842: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1843: goto out;
1.4 djm 1844:
1845: /* Success */
1.1 djm 1846: ret = 0;
1847: out:
1.4 djm 1848: sshbuf_free(crit);
1849: sshbuf_free(exts);
1850: sshbuf_free(principals);
1.1 djm 1851: free(sig_key);
1852: free(sig);
1853: return ret;
1854: }
1855:
1856: static int
1857: sshkey_from_blob_internal(const u_char *blob, size_t blen,
1858: struct sshkey **keyp, int allow_cert)
1859: {
1860: struct sshbuf *b = NULL;
1861: int type, nid = -1, ret = SSH_ERR_INTERNAL_ERROR;
1862: char *ktype = NULL, *curve = NULL;
1863: struct sshkey *key = NULL;
1864: size_t len;
1865: u_char *pk = NULL;
1866: #ifdef WITH_OPENSSL
1867: EC_POINT *q = NULL;
1868: #endif /* WITH_OPENSSL */
1869:
1870: #ifdef DEBUG_PK /* XXX */
1871: dump_base64(stderr, blob, blen);
1872: #endif
1873: *keyp = NULL;
1874: if ((b = sshbuf_from(blob, blen)) == NULL)
1875: return SSH_ERR_ALLOC_FAIL;
1876: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1877: ret = SSH_ERR_INVALID_FORMAT;
1878: goto out;
1879: }
1880:
1881: type = sshkey_type_from_name(ktype);
1882: if (sshkey_type_plain(type) == KEY_ECDSA)
1883: nid = sshkey_ecdsa_nid_from_name(ktype);
1884: if (!allow_cert && sshkey_type_is_cert(type)) {
1885: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1886: goto out;
1887: }
1888: switch (type) {
1889: #ifdef WITH_OPENSSL
1890: case KEY_RSA_CERT:
1891: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1892: ret = SSH_ERR_INVALID_FORMAT;
1893: goto out;
1894: }
1895: /* FALLTHROUGH */
1896: case KEY_RSA:
1897: case KEY_RSA_CERT_V00:
1898: if ((key = sshkey_new(type)) == NULL) {
1899: ret = SSH_ERR_ALLOC_FAIL;
1900: goto out;
1901: }
1902: if (sshbuf_get_bignum2(b, key->rsa->e) == -1 ||
1903: sshbuf_get_bignum2(b, key->rsa->n) == -1) {
1904: ret = SSH_ERR_INVALID_FORMAT;
1905: goto out;
1906: }
1907: #ifdef DEBUG_PK
1908: RSA_print_fp(stderr, key->rsa, 8);
1909: #endif
1910: break;
1911: case KEY_DSA_CERT:
1912: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1913: ret = SSH_ERR_INVALID_FORMAT;
1914: goto out;
1915: }
1916: /* FALLTHROUGH */
1917: case KEY_DSA:
1918: case KEY_DSA_CERT_V00:
1919: if ((key = sshkey_new(type)) == NULL) {
1920: ret = SSH_ERR_ALLOC_FAIL;
1921: goto out;
1922: }
1923: if (sshbuf_get_bignum2(b, key->dsa->p) == -1 ||
1924: sshbuf_get_bignum2(b, key->dsa->q) == -1 ||
1925: sshbuf_get_bignum2(b, key->dsa->g) == -1 ||
1926: sshbuf_get_bignum2(b, key->dsa->pub_key) == -1) {
1927: ret = SSH_ERR_INVALID_FORMAT;
1928: goto out;
1929: }
1930: #ifdef DEBUG_PK
1931: DSA_print_fp(stderr, key->dsa, 8);
1932: #endif
1933: break;
1934: case KEY_ECDSA_CERT:
1935: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1936: ret = SSH_ERR_INVALID_FORMAT;
1937: goto out;
1938: }
1939: /* FALLTHROUGH */
1940: case KEY_ECDSA:
1941: if ((key = sshkey_new(type)) == NULL) {
1942: ret = SSH_ERR_ALLOC_FAIL;
1943: goto out;
1944: }
1945: key->ecdsa_nid = nid;
1946: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1947: ret = SSH_ERR_INVALID_FORMAT;
1948: goto out;
1949: }
1950: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1951: ret = SSH_ERR_EC_CURVE_MISMATCH;
1952: goto out;
1953: }
1954: if (key->ecdsa != NULL)
1955: EC_KEY_free(key->ecdsa);
1956: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1957: == NULL) {
1958: ret = SSH_ERR_EC_CURVE_INVALID;
1959: goto out;
1960: }
1961: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
1962: ret = SSH_ERR_ALLOC_FAIL;
1963: goto out;
1964: }
1965: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
1966: ret = SSH_ERR_INVALID_FORMAT;
1967: goto out;
1968: }
1969: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1970: q) != 0) {
1971: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1972: goto out;
1973: }
1974: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
1975: /* XXX assume it is a allocation error */
1976: ret = SSH_ERR_ALLOC_FAIL;
1977: goto out;
1978: }
1979: #ifdef DEBUG_PK
1980: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1981: #endif
1982: break;
1983: #endif /* WITH_OPENSSL */
1984: case KEY_ED25519_CERT:
1985: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1986: ret = SSH_ERR_INVALID_FORMAT;
1987: goto out;
1988: }
1989: /* FALLTHROUGH */
1990: case KEY_ED25519:
1991: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
1992: goto out;
1993: if (len != ED25519_PK_SZ) {
1994: ret = SSH_ERR_INVALID_FORMAT;
1995: goto out;
1996: }
1997: if ((key = sshkey_new(type)) == NULL) {
1998: ret = SSH_ERR_ALLOC_FAIL;
1999: goto out;
2000: }
2001: key->ed25519_pk = pk;
2002: pk = NULL;
2003: break;
2004: case KEY_UNSPEC:
2005: if ((key = sshkey_new(type)) == NULL) {
2006: ret = SSH_ERR_ALLOC_FAIL;
2007: goto out;
2008: }
2009: break;
2010: default:
2011: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2012: goto out;
2013: }
2014:
2015: /* Parse certificate potion */
2016: if (sshkey_is_cert(key) &&
2017: (ret = cert_parse(b, key, blob, blen)) != 0)
2018: goto out;
2019:
2020: if (key != NULL && sshbuf_len(b) != 0) {
2021: ret = SSH_ERR_INVALID_FORMAT;
2022: goto out;
2023: }
2024: ret = 0;
2025: *keyp = key;
2026: key = NULL;
2027: out:
2028: sshbuf_free(b);
2029: sshkey_free(key);
2030: free(ktype);
2031: free(curve);
2032: free(pk);
2033: #ifdef WITH_OPENSSL
2034: if (q != NULL)
2035: EC_POINT_free(q);
2036: #endif /* WITH_OPENSSL */
2037: return ret;
2038: }
2039:
2040: int
2041: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2042: {
2043: return sshkey_from_blob_internal(blob, blen, keyp, 1);
2044: }
2045:
2046: int
2047: sshkey_sign(const struct sshkey *key,
2048: u_char **sigp, size_t *lenp,
2049: const u_char *data, size_t datalen, u_int compat)
2050: {
2051: if (sigp != NULL)
2052: *sigp = NULL;
2053: if (lenp != NULL)
2054: *lenp = 0;
2055: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2056: return SSH_ERR_INVALID_ARGUMENT;
2057: switch (key->type) {
2058: #ifdef WITH_OPENSSL
2059: case KEY_DSA_CERT_V00:
2060: case KEY_DSA_CERT:
2061: case KEY_DSA:
2062: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2063: case KEY_ECDSA_CERT:
2064: case KEY_ECDSA:
2065: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2066: case KEY_RSA_CERT_V00:
2067: case KEY_RSA_CERT:
2068: case KEY_RSA:
2069: return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2070: #endif /* WITH_OPENSSL */
2071: case KEY_ED25519:
2072: case KEY_ED25519_CERT:
2073: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2074: default:
2075: return SSH_ERR_KEY_TYPE_UNKNOWN;
2076: }
2077: }
2078:
2079: /*
2080: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2081: */
2082: int
2083: sshkey_verify(const struct sshkey *key,
2084: const u_char *sig, size_t siglen,
2085: const u_char *data, size_t dlen, u_int compat)
2086: {
1.6 ! djm 2087: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2088: return SSH_ERR_INVALID_ARGUMENT;
2089: switch (key->type) {
2090: #ifdef WITH_OPENSSL
2091: case KEY_DSA_CERT_V00:
2092: case KEY_DSA_CERT:
2093: case KEY_DSA:
2094: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2095: case KEY_ECDSA_CERT:
2096: case KEY_ECDSA:
2097: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2098: case KEY_RSA_CERT_V00:
2099: case KEY_RSA_CERT:
2100: case KEY_RSA:
2101: return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2102: #endif /* WITH_OPENSSL */
2103: case KEY_ED25519:
2104: case KEY_ED25519_CERT:
2105: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2106: default:
2107: return SSH_ERR_KEY_TYPE_UNKNOWN;
2108: }
2109: }
2110:
2111: /* Converts a private to a public key */
2112: int
2113: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2114: {
2115: struct sshkey *pk;
2116: int ret = SSH_ERR_INTERNAL_ERROR;
2117:
2118: if (dkp != NULL)
2119: *dkp = NULL;
2120:
2121: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2122: return SSH_ERR_ALLOC_FAIL;
2123: pk->type = k->type;
2124: pk->flags = k->flags;
2125: pk->ecdsa_nid = k->ecdsa_nid;
2126: pk->dsa = NULL;
2127: pk->ecdsa = NULL;
2128: pk->rsa = NULL;
2129: pk->ed25519_pk = NULL;
2130: pk->ed25519_sk = NULL;
2131:
2132: switch (k->type) {
2133: #ifdef WITH_OPENSSL
2134: case KEY_RSA_CERT_V00:
2135: case KEY_RSA_CERT:
2136: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2137: goto fail;
2138: /* FALLTHROUGH */
2139: case KEY_RSA1:
2140: case KEY_RSA:
2141: if ((pk->rsa = RSA_new()) == NULL ||
2142: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2143: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2144: ret = SSH_ERR_ALLOC_FAIL;
2145: goto fail;
2146: }
2147: break;
2148: case KEY_DSA_CERT_V00:
2149: case KEY_DSA_CERT:
2150: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2151: goto fail;
2152: /* FALLTHROUGH */
2153: case KEY_DSA:
2154: if ((pk->dsa = DSA_new()) == NULL ||
2155: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2156: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2157: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2158: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2159: ret = SSH_ERR_ALLOC_FAIL;
2160: goto fail;
2161: }
2162: break;
2163: case KEY_ECDSA_CERT:
2164: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2165: goto fail;
2166: /* FALLTHROUGH */
2167: case KEY_ECDSA:
2168: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2169: if (pk->ecdsa == NULL) {
2170: ret = SSH_ERR_ALLOC_FAIL;
2171: goto fail;
2172: }
2173: if (EC_KEY_set_public_key(pk->ecdsa,
2174: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2175: ret = SSH_ERR_LIBCRYPTO_ERROR;
2176: goto fail;
2177: }
2178: break;
2179: #endif /* WITH_OPENSSL */
2180: case KEY_ED25519_CERT:
2181: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2182: goto fail;
2183: /* FALLTHROUGH */
2184: case KEY_ED25519:
2185: if (k->ed25519_pk != NULL) {
2186: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2187: ret = SSH_ERR_ALLOC_FAIL;
2188: goto fail;
2189: }
2190: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2191: }
2192: break;
2193: default:
2194: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2195: fail:
2196: sshkey_free(pk);
2197: return ret;
2198: }
2199: *dkp = pk;
2200: return 0;
2201: }
2202:
2203: /* Convert a plain key to their _CERT equivalent */
2204: int
2205: sshkey_to_certified(struct sshkey *k, int legacy)
2206: {
2207: int newtype;
2208:
2209: switch (k->type) {
2210: #ifdef WITH_OPENSSL
2211: case KEY_RSA:
2212: newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
2213: break;
2214: case KEY_DSA:
2215: newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
2216: break;
2217: case KEY_ECDSA:
2218: if (legacy)
2219: return SSH_ERR_INVALID_ARGUMENT;
2220: newtype = KEY_ECDSA_CERT;
2221: break;
2222: #endif /* WITH_OPENSSL */
2223: case KEY_ED25519:
2224: if (legacy)
2225: return SSH_ERR_INVALID_ARGUMENT;
2226: newtype = KEY_ED25519_CERT;
2227: break;
2228: default:
2229: return SSH_ERR_INVALID_ARGUMENT;
2230: }
2231: if ((k->cert = cert_new()) == NULL)
2232: return SSH_ERR_ALLOC_FAIL;
2233: k->type = newtype;
2234: return 0;
2235: }
2236:
2237: /* Convert a certificate to its raw key equivalent */
2238: int
2239: sshkey_drop_cert(struct sshkey *k)
2240: {
2241: if (!sshkey_type_is_cert(k->type))
2242: return SSH_ERR_KEY_TYPE_UNKNOWN;
2243: cert_free(k->cert);
2244: k->cert = NULL;
2245: k->type = sshkey_type_plain(k->type);
2246: return 0;
2247: }
2248:
2249: /* Sign a certified key, (re-)generating the signed certblob. */
2250: int
2251: sshkey_certify(struct sshkey *k, struct sshkey *ca)
2252: {
2253: struct sshbuf *principals = NULL;
2254: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2255: size_t i, ca_len, sig_len;
2256: int ret = SSH_ERR_INTERNAL_ERROR;
2257: struct sshbuf *cert;
2258:
2259: if (k == NULL || k->cert == NULL ||
2260: k->cert->certblob == NULL || ca == NULL)
2261: return SSH_ERR_INVALID_ARGUMENT;
2262: if (!sshkey_is_cert(k))
2263: return SSH_ERR_KEY_TYPE_UNKNOWN;
2264: if (!sshkey_type_is_valid_ca(ca->type))
2265: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2266:
2267: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2268: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2269:
2270: cert = k->cert->certblob; /* for readability */
2271: sshbuf_reset(cert);
2272: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2273: goto out;
2274:
2275: /* -v01 certs put nonce first */
2276: arc4random_buf(&nonce, sizeof(nonce));
2277: if (!sshkey_cert_is_legacy(k)) {
2278: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2279: goto out;
2280: }
2281:
2282: /* XXX this substantially duplicates to_blob(); refactor */
2283: switch (k->type) {
2284: #ifdef WITH_OPENSSL
2285: case KEY_DSA_CERT_V00:
2286: case KEY_DSA_CERT:
2287: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2288: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2289: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2290: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2291: goto out;
2292: break;
2293: case KEY_ECDSA_CERT:
2294: if ((ret = sshbuf_put_cstring(cert,
2295: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2296: (ret = sshbuf_put_ec(cert,
2297: EC_KEY_get0_public_key(k->ecdsa),
2298: EC_KEY_get0_group(k->ecdsa))) != 0)
2299: goto out;
2300: break;
2301: case KEY_RSA_CERT_V00:
2302: case KEY_RSA_CERT:
2303: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2304: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2305: goto out;
2306: break;
2307: #endif /* WITH_OPENSSL */
2308: case KEY_ED25519_CERT:
2309: if ((ret = sshbuf_put_string(cert,
2310: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2311: goto out;
2312: break;
2313: default:
2314: ret = SSH_ERR_INVALID_ARGUMENT;
2315: }
2316:
2317: /* -v01 certs have a serial number next */
2318: if (!sshkey_cert_is_legacy(k)) {
2319: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
2320: goto out;
2321: }
2322:
2323: if ((ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2324: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2325: goto out;
2326:
2327: if ((principals = sshbuf_new()) == NULL) {
2328: ret = SSH_ERR_ALLOC_FAIL;
2329: goto out;
2330: }
2331: for (i = 0; i < k->cert->nprincipals; i++) {
2332: if ((ret = sshbuf_put_cstring(principals,
2333: k->cert->principals[i])) != 0)
2334: goto out;
2335: }
2336: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2337: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2338: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2339: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0)
2340: goto out;
2341:
2342: /* -v01 certs have non-critical options here */
2343: if (!sshkey_cert_is_legacy(k)) {
2344: if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
2345: goto out;
2346: }
2347:
2348: /* -v00 certs put the nonce at the end */
2349: if (sshkey_cert_is_legacy(k)) {
2350: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2351: goto out;
2352: }
2353:
2354: if ((ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2355: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2356: goto out;
2357:
2358: /* Sign the whole mess */
2359: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2360: sshbuf_len(cert), 0)) != 0)
2361: goto out;
2362:
2363: /* Append signature and we are done */
2364: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2365: goto out;
2366: ret = 0;
2367: out:
2368: if (ret != 0)
2369: sshbuf_reset(cert);
2370: if (sig_blob != NULL)
2371: free(sig_blob);
2372: if (ca_blob != NULL)
2373: free(ca_blob);
2374: if (principals != NULL)
2375: sshbuf_free(principals);
2376: return ret;
2377: }
2378:
2379: int
2380: sshkey_cert_check_authority(const struct sshkey *k,
2381: int want_host, int require_principal,
2382: const char *name, const char **reason)
2383: {
2384: u_int i, principal_matches;
2385: time_t now = time(NULL);
2386:
2387: if (reason != NULL)
2388: *reason = NULL;
2389:
2390: if (want_host) {
2391: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2392: *reason = "Certificate invalid: not a host certificate";
2393: return SSH_ERR_KEY_CERT_INVALID;
2394: }
2395: } else {
2396: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2397: *reason = "Certificate invalid: not a user certificate";
2398: return SSH_ERR_KEY_CERT_INVALID;
2399: }
2400: }
2401: if (now < 0) {
2402: /* yikes - system clock before epoch! */
2403: *reason = "Certificate invalid: not yet valid";
2404: return SSH_ERR_KEY_CERT_INVALID;
2405: }
2406: if ((u_int64_t)now < k->cert->valid_after) {
2407: *reason = "Certificate invalid: not yet valid";
2408: return SSH_ERR_KEY_CERT_INVALID;
2409: }
2410: if ((u_int64_t)now >= k->cert->valid_before) {
2411: *reason = "Certificate invalid: expired";
2412: return SSH_ERR_KEY_CERT_INVALID;
2413: }
2414: if (k->cert->nprincipals == 0) {
2415: if (require_principal) {
2416: *reason = "Certificate lacks principal list";
2417: return SSH_ERR_KEY_CERT_INVALID;
2418: }
2419: } else if (name != NULL) {
2420: principal_matches = 0;
2421: for (i = 0; i < k->cert->nprincipals; i++) {
2422: if (strcmp(name, k->cert->principals[i]) == 0) {
2423: principal_matches = 1;
2424: break;
2425: }
2426: }
2427: if (!principal_matches) {
2428: *reason = "Certificate invalid: name is not a listed "
2429: "principal";
2430: return SSH_ERR_KEY_CERT_INVALID;
2431: }
2432: }
2433: return 0;
2434: }
2435:
2436: int
2437: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2438: {
2439: int r = SSH_ERR_INTERNAL_ERROR;
2440:
2441: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2442: goto out;
2443: switch (key->type) {
2444: #ifdef WITH_OPENSSL
2445: case KEY_RSA:
2446: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2447: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2448: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2449: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2450: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2451: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2452: goto out;
2453: break;
2454: case KEY_RSA_CERT_V00:
2455: case KEY_RSA_CERT:
2456: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2457: r = SSH_ERR_INVALID_ARGUMENT;
2458: goto out;
2459: }
2460: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2461: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2462: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2463: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2464: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2465: goto out;
2466: break;
2467: case KEY_DSA:
2468: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2469: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2470: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2471: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2472: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2473: goto out;
2474: break;
2475: case KEY_DSA_CERT_V00:
2476: case KEY_DSA_CERT:
2477: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2478: r = SSH_ERR_INVALID_ARGUMENT;
2479: goto out;
2480: }
2481: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2482: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2483: goto out;
2484: break;
2485: case KEY_ECDSA:
2486: if ((r = sshbuf_put_cstring(b,
2487: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2488: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2489: (r = sshbuf_put_bignum2(b,
2490: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2491: goto out;
2492: break;
2493: case KEY_ECDSA_CERT:
2494: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2495: r = SSH_ERR_INVALID_ARGUMENT;
2496: goto out;
2497: }
2498: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2499: (r = sshbuf_put_bignum2(b,
2500: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2501: goto out;
2502: break;
2503: #endif /* WITH_OPENSSL */
2504: case KEY_ED25519:
2505: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2506: ED25519_PK_SZ)) != 0 ||
2507: (r = sshbuf_put_string(b, key->ed25519_sk,
2508: ED25519_SK_SZ)) != 0)
2509: goto out;
2510: break;
2511: case KEY_ED25519_CERT:
2512: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2513: r = SSH_ERR_INVALID_ARGUMENT;
2514: goto out;
2515: }
2516: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2517: (r = sshbuf_put_string(b, key->ed25519_pk,
2518: ED25519_PK_SZ)) != 0 ||
2519: (r = sshbuf_put_string(b, key->ed25519_sk,
2520: ED25519_SK_SZ)) != 0)
2521: goto out;
2522: break;
2523: default:
2524: r = SSH_ERR_INVALID_ARGUMENT;
2525: goto out;
2526: }
2527: /* success */
2528: r = 0;
2529: out:
2530: return r;
2531: }
2532:
2533: int
2534: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2535: {
2536: char *tname = NULL, *curve = NULL;
2537: struct sshkey *k = NULL;
2538: const u_char *cert;
2539: size_t len, pklen = 0, sklen = 0;
2540: int type, r = SSH_ERR_INTERNAL_ERROR;
2541: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2542: #ifdef WITH_OPENSSL
2543: BIGNUM *exponent = NULL;
2544: #endif /* WITH_OPENSSL */
2545:
2546: if (kp != NULL)
2547: *kp = NULL;
2548: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2549: goto out;
2550: type = sshkey_type_from_name(tname);
2551: switch (type) {
2552: #ifdef WITH_OPENSSL
2553: case KEY_DSA:
2554: if ((k = sshkey_new_private(type)) == NULL) {
2555: r = SSH_ERR_ALLOC_FAIL;
2556: goto out;
2557: }
2558: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2559: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2560: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2561: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2562: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2563: goto out;
2564: break;
2565: case KEY_DSA_CERT_V00:
2566: case KEY_DSA_CERT:
2567: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2568: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2569: (r = sshkey_add_private(k)) != 0 ||
2570: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2571: goto out;
2572: break;
2573: case KEY_ECDSA:
2574: if ((k = sshkey_new_private(type)) == NULL) {
2575: r = SSH_ERR_ALLOC_FAIL;
2576: goto out;
2577: }
2578: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2579: r = SSH_ERR_INVALID_ARGUMENT;
2580: goto out;
2581: }
2582: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2583: goto out;
2584: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2585: r = SSH_ERR_EC_CURVE_MISMATCH;
2586: goto out;
2587: }
2588: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2589: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2590: r = SSH_ERR_LIBCRYPTO_ERROR;
2591: goto out;
2592: }
2593: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2594: (r = sshbuf_get_bignum2(buf, exponent)))
2595: goto out;
2596: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2597: r = SSH_ERR_LIBCRYPTO_ERROR;
2598: goto out;
2599: }
2600: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2601: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2602: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2603: goto out;
2604: break;
2605: case KEY_ECDSA_CERT:
2606: if ((exponent = BN_new()) == NULL) {
2607: r = SSH_ERR_LIBCRYPTO_ERROR;
2608: goto out;
2609: }
2610: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2611: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2612: (r = sshkey_add_private(k)) != 0 ||
2613: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2614: goto out;
2615: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2616: r = SSH_ERR_LIBCRYPTO_ERROR;
2617: goto out;
2618: }
2619: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2620: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2621: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2622: goto out;
2623: break;
2624: case KEY_RSA:
2625: if ((k = sshkey_new_private(type)) == NULL) {
2626: r = SSH_ERR_ALLOC_FAIL;
2627: goto out;
2628: }
2629: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2630: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2631: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2632: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2633: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2634: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2635: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2636: goto out;
2637: break;
2638: case KEY_RSA_CERT_V00:
2639: case KEY_RSA_CERT:
2640: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2641: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2642: (r = sshkey_add_private(k)) != 0 ||
2643: (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2644: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2645: (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2646: (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2647: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2648: goto out;
2649: break;
2650: #endif /* WITH_OPENSSL */
2651: case KEY_ED25519:
2652: if ((k = sshkey_new_private(type)) == NULL) {
2653: r = SSH_ERR_ALLOC_FAIL;
2654: goto out;
2655: }
2656: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2657: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2658: goto out;
2659: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2660: r = SSH_ERR_INVALID_FORMAT;
2661: goto out;
2662: }
2663: k->ed25519_pk = ed25519_pk;
2664: k->ed25519_sk = ed25519_sk;
2665: ed25519_pk = ed25519_sk = NULL;
2666: break;
2667: case KEY_ED25519_CERT:
2668: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2669: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2670: (r = sshkey_add_private(k)) != 0 ||
2671: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2672: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2673: goto out;
2674: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2675: r = SSH_ERR_INVALID_FORMAT;
2676: goto out;
2677: }
2678: k->ed25519_pk = ed25519_pk;
2679: k->ed25519_sk = ed25519_sk;
2680: ed25519_pk = ed25519_sk = NULL;
2681: break;
2682: default:
2683: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2684: goto out;
2685: }
2686: #ifdef WITH_OPENSSL
2687: /* enable blinding */
2688: switch (k->type) {
2689: case KEY_RSA:
2690: case KEY_RSA_CERT_V00:
2691: case KEY_RSA_CERT:
2692: case KEY_RSA1:
2693: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2694: r = SSH_ERR_LIBCRYPTO_ERROR;
2695: goto out;
2696: }
2697: break;
2698: }
2699: #endif /* WITH_OPENSSL */
2700: /* success */
2701: r = 0;
2702: if (kp != NULL) {
2703: *kp = k;
2704: k = NULL;
2705: }
2706: out:
2707: free(tname);
2708: free(curve);
2709: #ifdef WITH_OPENSSL
2710: if (exponent != NULL)
2711: BN_clear_free(exponent);
2712: #endif /* WITH_OPENSSL */
2713: sshkey_free(k);
2714: if (ed25519_pk != NULL) {
2715: explicit_bzero(ed25519_pk, pklen);
2716: free(ed25519_pk);
2717: }
2718: if (ed25519_sk != NULL) {
2719: explicit_bzero(ed25519_sk, sklen);
2720: free(ed25519_sk);
2721: }
2722: return r;
2723: }
2724:
2725: #ifdef WITH_OPENSSL
2726: int
2727: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2728: {
2729: BN_CTX *bnctx;
2730: EC_POINT *nq = NULL;
2731: BIGNUM *order, *x, *y, *tmp;
2732: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2733:
2734: if ((bnctx = BN_CTX_new()) == NULL)
2735: return SSH_ERR_ALLOC_FAIL;
2736: BN_CTX_start(bnctx);
2737:
2738: /*
2739: * We shouldn't ever hit this case because bignum_get_ecpoint()
2740: * refuses to load GF2m points.
2741: */
2742: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2743: NID_X9_62_prime_field)
2744: goto out;
2745:
2746: /* Q != infinity */
2747: if (EC_POINT_is_at_infinity(group, public))
2748: goto out;
2749:
2750: if ((x = BN_CTX_get(bnctx)) == NULL ||
2751: (y = BN_CTX_get(bnctx)) == NULL ||
2752: (order = BN_CTX_get(bnctx)) == NULL ||
2753: (tmp = BN_CTX_get(bnctx)) == NULL) {
2754: ret = SSH_ERR_ALLOC_FAIL;
2755: goto out;
2756: }
2757:
2758: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2759: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2760: EC_POINT_get_affine_coordinates_GFp(group, public,
2761: x, y, bnctx) != 1) {
2762: ret = SSH_ERR_LIBCRYPTO_ERROR;
2763: goto out;
2764: }
2765: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2766: BN_num_bits(y) <= BN_num_bits(order) / 2)
2767: goto out;
2768:
2769: /* nQ == infinity (n == order of subgroup) */
2770: if ((nq = EC_POINT_new(group)) == NULL) {
2771: ret = SSH_ERR_ALLOC_FAIL;
2772: goto out;
2773: }
2774: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2775: ret = SSH_ERR_LIBCRYPTO_ERROR;
2776: goto out;
2777: }
2778: if (EC_POINT_is_at_infinity(group, nq) != 1)
2779: goto out;
2780:
2781: /* x < order - 1, y < order - 1 */
2782: if (!BN_sub(tmp, order, BN_value_one())) {
2783: ret = SSH_ERR_LIBCRYPTO_ERROR;
2784: goto out;
2785: }
2786: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2787: goto out;
2788: ret = 0;
2789: out:
2790: BN_CTX_free(bnctx);
2791: if (nq != NULL)
2792: EC_POINT_free(nq);
2793: return ret;
2794: }
2795:
2796: int
2797: sshkey_ec_validate_private(const EC_KEY *key)
2798: {
2799: BN_CTX *bnctx;
2800: BIGNUM *order, *tmp;
2801: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2802:
2803: if ((bnctx = BN_CTX_new()) == NULL)
2804: return SSH_ERR_ALLOC_FAIL;
2805: BN_CTX_start(bnctx);
2806:
2807: if ((order = BN_CTX_get(bnctx)) == NULL ||
2808: (tmp = BN_CTX_get(bnctx)) == NULL) {
2809: ret = SSH_ERR_ALLOC_FAIL;
2810: goto out;
2811: }
2812:
2813: /* log2(private) > log2(order)/2 */
2814: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2815: ret = SSH_ERR_LIBCRYPTO_ERROR;
2816: goto out;
2817: }
2818: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2819: BN_num_bits(order) / 2)
2820: goto out;
2821:
2822: /* private < order - 1 */
2823: if (!BN_sub(tmp, order, BN_value_one())) {
2824: ret = SSH_ERR_LIBCRYPTO_ERROR;
2825: goto out;
2826: }
2827: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2828: goto out;
2829: ret = 0;
2830: out:
2831: BN_CTX_free(bnctx);
2832: return ret;
2833: }
2834:
2835: void
2836: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2837: {
2838: BIGNUM *x, *y;
2839: BN_CTX *bnctx;
2840:
2841: if (point == NULL) {
2842: fputs("point=(NULL)\n", stderr);
2843: return;
2844: }
2845: if ((bnctx = BN_CTX_new()) == NULL) {
2846: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2847: return;
2848: }
2849: BN_CTX_start(bnctx);
2850: if ((x = BN_CTX_get(bnctx)) == NULL ||
2851: (y = BN_CTX_get(bnctx)) == NULL) {
2852: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2853: return;
2854: }
2855: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2856: NID_X9_62_prime_field) {
2857: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2858: return;
2859: }
2860: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2861: bnctx) != 1) {
2862: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2863: __func__);
2864: return;
2865: }
2866: fputs("x=", stderr);
2867: BN_print_fp(stderr, x);
2868: fputs("\ny=", stderr);
2869: BN_print_fp(stderr, y);
2870: fputs("\n", stderr);
2871: BN_CTX_free(bnctx);
2872: }
2873:
2874: void
2875: sshkey_dump_ec_key(const EC_KEY *key)
2876: {
2877: const BIGNUM *exponent;
2878:
2879: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2880: EC_KEY_get0_public_key(key));
2881: fputs("exponent=", stderr);
2882: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2883: fputs("(NULL)", stderr);
2884: else
2885: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2886: fputs("\n", stderr);
2887: }
2888: #endif /* WITH_OPENSSL */
2889:
2890: static int
2891: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2892: const char *passphrase, const char *comment, const char *ciphername,
2893: int rounds)
2894: {
1.4 djm 2895: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2896: u_char salt[SALT_LEN];
1.4 djm 2897: char *b64 = NULL;
1.1 djm 2898: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2899: u_int check;
2900: int r = SSH_ERR_INTERNAL_ERROR;
2901: struct sshcipher_ctx ciphercontext;
2902: const struct sshcipher *cipher;
2903: const char *kdfname = KDFNAME;
2904: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2905:
2906: memset(&ciphercontext, 0, sizeof(ciphercontext));
2907:
2908: if (rounds <= 0)
2909: rounds = DEFAULT_ROUNDS;
2910: if (passphrase == NULL || !strlen(passphrase)) {
2911: ciphername = "none";
2912: kdfname = "none";
2913: } else if (ciphername == NULL)
2914: ciphername = DEFAULT_CIPHERNAME;
2915: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2916: r = SSH_ERR_INVALID_ARGUMENT;
2917: goto out;
2918: }
2919: if ((cipher = cipher_by_name(ciphername)) == NULL) {
2920: r = SSH_ERR_INTERNAL_ERROR;
2921: goto out;
2922: }
2923:
2924: if ((kdf = sshbuf_new()) == NULL ||
2925: (encoded = sshbuf_new()) == NULL ||
2926: (encrypted = sshbuf_new()) == NULL) {
2927: r = SSH_ERR_ALLOC_FAIL;
2928: goto out;
2929: }
2930: blocksize = cipher_blocksize(cipher);
2931: keylen = cipher_keylen(cipher);
2932: ivlen = cipher_ivlen(cipher);
2933: authlen = cipher_authlen(cipher);
2934: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2935: r = SSH_ERR_ALLOC_FAIL;
2936: goto out;
2937: }
2938: if (strcmp(kdfname, "bcrypt") == 0) {
2939: arc4random_buf(salt, SALT_LEN);
2940: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2941: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2942: r = SSH_ERR_INVALID_ARGUMENT;
2943: goto out;
2944: }
2945: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2946: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2947: goto out;
2948: } else if (strcmp(kdfname, "none") != 0) {
2949: /* Unsupported KDF type */
2950: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2951: goto out;
2952: }
2953: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2954: key + keylen, ivlen, 1)) != 0)
2955: goto out;
2956:
2957: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
2958: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
2959: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
2960: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
2961: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
2962: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
2963: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
2964: goto out;
2965:
2966: /* set up the buffer that will be encrypted */
2967:
2968: /* Random check bytes */
2969: check = arc4random();
2970: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
2971: (r = sshbuf_put_u32(encrypted, check)) != 0)
2972: goto out;
2973:
2974: /* append private key and comment*/
2975: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
2976: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
2977: goto out;
2978:
2979: /* padding */
2980: i = 0;
2981: while (sshbuf_len(encrypted) % blocksize) {
2982: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
2983: goto out;
2984: }
2985:
2986: /* length in destination buffer */
2987: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
2988: goto out;
2989:
2990: /* encrypt */
2991: if ((r = sshbuf_reserve(encoded,
2992: sshbuf_len(encrypted) + authlen, &cp)) != 0)
2993: goto out;
2994: if ((r = cipher_crypt(&ciphercontext, 0, cp,
2995: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
2996: goto out;
2997:
2998: /* uuencode */
2999: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3000: r = SSH_ERR_ALLOC_FAIL;
3001: goto out;
3002: }
3003:
3004: sshbuf_reset(blob);
3005: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3006: goto out;
3007: for (i = 0; i < strlen(b64); i++) {
3008: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3009: goto out;
3010: /* insert line breaks */
3011: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3012: goto out;
3013: }
3014: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3015: goto out;
3016: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3017: goto out;
3018:
3019: /* success */
3020: r = 0;
3021:
3022: out:
3023: sshbuf_free(kdf);
3024: sshbuf_free(encoded);
3025: sshbuf_free(encrypted);
3026: cipher_cleanup(&ciphercontext);
3027: explicit_bzero(salt, sizeof(salt));
3028: if (key != NULL) {
3029: explicit_bzero(key, keylen + ivlen);
3030: free(key);
3031: }
3032: if (pubkeyblob != NULL) {
3033: explicit_bzero(pubkeyblob, pubkeylen);
3034: free(pubkeyblob);
3035: }
3036: if (b64 != NULL) {
3037: explicit_bzero(b64, strlen(b64));
3038: free(b64);
3039: }
3040: return r;
3041: }
3042:
3043: static int
3044: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3045: struct sshkey **keyp, char **commentp)
3046: {
3047: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3048: const struct sshcipher *cipher = NULL;
3049: const u_char *cp;
3050: int r = SSH_ERR_INTERNAL_ERROR;
3051: size_t encoded_len;
3052: size_t i, keylen = 0, ivlen = 0, slen = 0;
3053: struct sshbuf *encoded = NULL, *decoded = NULL;
3054: struct sshbuf *kdf = NULL, *decrypted = NULL;
3055: struct sshcipher_ctx ciphercontext;
3056: struct sshkey *k = NULL;
3057: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3058: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3059:
3060: memset(&ciphercontext, 0, sizeof(ciphercontext));
3061: if (keyp != NULL)
3062: *keyp = NULL;
3063: if (commentp != NULL)
3064: *commentp = NULL;
3065:
3066: if ((encoded = sshbuf_new()) == NULL ||
3067: (decoded = sshbuf_new()) == NULL ||
3068: (decrypted = sshbuf_new()) == NULL) {
3069: r = SSH_ERR_ALLOC_FAIL;
3070: goto out;
3071: }
3072:
3073: /* check preamble */
3074: cp = sshbuf_ptr(blob);
3075: encoded_len = sshbuf_len(blob);
3076: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3077: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3078: r = SSH_ERR_INVALID_FORMAT;
3079: goto out;
3080: }
3081: cp += MARK_BEGIN_LEN;
3082: encoded_len -= MARK_BEGIN_LEN;
3083:
3084: /* Look for end marker, removing whitespace as we go */
3085: while (encoded_len > 0) {
3086: if (*cp != '\n' && *cp != '\r') {
3087: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3088: goto out;
3089: }
3090: last = *cp;
3091: encoded_len--;
3092: cp++;
3093: if (last == '\n') {
3094: if (encoded_len >= MARK_END_LEN &&
3095: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3096: /* \0 terminate */
3097: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3098: goto out;
3099: break;
3100: }
3101: }
3102: }
3103: if (encoded_len == 0) {
3104: r = SSH_ERR_INVALID_FORMAT;
3105: goto out;
3106: }
3107:
3108: /* decode base64 */
1.4 djm 3109: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3110: goto out;
3111:
3112: /* check magic */
3113: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3114: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3115: r = SSH_ERR_INVALID_FORMAT;
3116: goto out;
3117: }
3118: /* parse public portion of key */
3119: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3120: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3121: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3122: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3123: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3124: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3125: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3126: goto out;
3127:
3128: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3129: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3130: goto out;
3131: }
3132: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3133: strcmp(ciphername, "none") != 0) {
3134: /* passphrase required */
3135: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3136: goto out;
3137: }
3138: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3139: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3140: goto out;
3141: }
3142: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3143: r = SSH_ERR_INVALID_FORMAT;
3144: goto out;
3145: }
3146: if (nkeys != 1) {
3147: /* XXX only one key supported */
3148: r = SSH_ERR_INVALID_FORMAT;
3149: goto out;
3150: }
3151:
3152: /* check size of encrypted key blob */
3153: blocksize = cipher_blocksize(cipher);
3154: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3155: r = SSH_ERR_INVALID_FORMAT;
3156: goto out;
3157: }
3158:
3159: /* setup key */
3160: keylen = cipher_keylen(cipher);
3161: ivlen = cipher_ivlen(cipher);
3162: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3163: r = SSH_ERR_ALLOC_FAIL;
3164: goto out;
3165: }
3166: if (strcmp(kdfname, "bcrypt") == 0) {
3167: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3168: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3169: goto out;
3170: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3171: key, keylen + ivlen, rounds) < 0) {
3172: r = SSH_ERR_INVALID_FORMAT;
3173: goto out;
3174: }
3175: }
3176:
3177: /* decrypt private portion of key */
3178: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3179: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3180: key + keylen, ivlen, 0)) != 0)
3181: goto out;
3182: if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3183: sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 0) {
3184: /* an integrity error here indicates an incorrect passphrase */
3185: if (r == SSH_ERR_MAC_INVALID)
3186: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3187: goto out;
3188: }
3189: if ((r = sshbuf_consume(decoded, encrypted_len)) != 0)
3190: goto out;
3191: /* there should be no trailing data */
3192: if (sshbuf_len(decoded) != 0) {
3193: r = SSH_ERR_INVALID_FORMAT;
3194: goto out;
3195: }
3196:
3197: /* check check bytes */
3198: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3199: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3200: goto out;
3201: if (check1 != check2) {
3202: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3203: goto out;
3204: }
3205:
3206: /* Load the private key and comment */
3207: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3208: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3209: goto out;
3210:
3211: /* Check deterministic padding */
3212: i = 0;
3213: while (sshbuf_len(decrypted)) {
3214: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3215: goto out;
3216: if (pad != (++i & 0xff)) {
3217: r = SSH_ERR_INVALID_FORMAT;
3218: goto out;
3219: }
3220: }
3221:
3222: /* XXX decode pubkey and check against private */
3223:
3224: /* success */
3225: r = 0;
3226: if (keyp != NULL) {
3227: *keyp = k;
3228: k = NULL;
3229: }
3230: if (commentp != NULL) {
3231: *commentp = comment;
3232: comment = NULL;
3233: }
3234: out:
3235: pad = 0;
3236: cipher_cleanup(&ciphercontext);
3237: free(ciphername);
3238: free(kdfname);
3239: free(comment);
3240: if (salt != NULL) {
3241: explicit_bzero(salt, slen);
3242: free(salt);
3243: }
3244: if (key != NULL) {
3245: explicit_bzero(key, keylen + ivlen);
3246: free(key);
3247: }
3248: sshbuf_free(encoded);
3249: sshbuf_free(decoded);
3250: sshbuf_free(kdf);
3251: sshbuf_free(decrypted);
3252: sshkey_free(k);
3253: return r;
3254: }
3255:
3256: #if WITH_SSH1
3257: /*
3258: * Serialises the authentication (private) key to a blob, encrypting it with
3259: * passphrase. The identification of the blob (lowest 64 bits of n) will
3260: * precede the key to provide identification of the key without needing a
3261: * passphrase.
3262: */
3263: static int
3264: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3265: const char *passphrase, const char *comment)
3266: {
3267: struct sshbuf *buffer = NULL, *encrypted = NULL;
3268: u_char buf[8];
3269: int r, cipher_num;
3270: struct sshcipher_ctx ciphercontext;
3271: const struct sshcipher *cipher;
3272: u_char *cp;
3273:
3274: /*
3275: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3276: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3277: */
3278: cipher_num = (strcmp(passphrase, "") == 0) ?
3279: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3280: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3281: return SSH_ERR_INTERNAL_ERROR;
3282:
3283: /* This buffer is used to build the secret part of the private key. */
3284: if ((buffer = sshbuf_new()) == NULL)
3285: return SSH_ERR_ALLOC_FAIL;
3286:
3287: /* Put checkbytes for checking passphrase validity. */
3288: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3289: goto out;
3290: arc4random_buf(cp, 2);
3291: memcpy(cp + 2, cp, 2);
3292:
3293: /*
3294: * Store the private key (n and e will not be stored because they
3295: * will be stored in plain text, and storing them also in encrypted
3296: * format would just give known plaintext).
3297: * Note: q and p are stored in reverse order to SSL.
3298: */
3299: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3300: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3301: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3302: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3303: goto out;
3304:
3305: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3306: explicit_bzero(buf, 8);
3307: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3308: goto out;
3309:
3310: /* This buffer will be used to contain the data in the file. */
3311: if ((encrypted = sshbuf_new()) == NULL) {
3312: r = SSH_ERR_ALLOC_FAIL;
3313: goto out;
3314: }
3315:
3316: /* First store keyfile id string. */
3317: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3318: sizeof(LEGACY_BEGIN))) != 0)
3319: goto out;
3320:
3321: /* Store cipher type and "reserved" field. */
3322: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3323: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3324: goto out;
3325:
3326: /* Store public key. This will be in plain text. */
3327: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3328: (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3329: (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3330: (r = sshbuf_put_cstring(encrypted, comment) != 0))
3331: goto out;
3332:
3333: /* Allocate space for the private part of the key in the buffer. */
3334: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3335: goto out;
3336:
3337: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3338: CIPHER_ENCRYPT)) != 0)
3339: goto out;
3340: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3341: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3342: goto out;
3343: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3344: goto out;
3345:
3346: r = sshbuf_putb(blob, encrypted);
3347:
3348: out:
3349: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3350: explicit_bzero(buf, sizeof(buf));
3351: if (buffer != NULL)
3352: sshbuf_free(buffer);
3353: if (encrypted != NULL)
3354: sshbuf_free(encrypted);
3355:
3356: return r;
3357: }
3358: #endif /* WITH_SSH1 */
3359:
3360: #ifdef WITH_OPENSSL
3361: /* convert SSH v2 key in OpenSSL PEM format */
3362: static int
3363: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3364: const char *_passphrase, const char *comment)
3365: {
3366: int success, r;
3367: int blen, len = strlen(_passphrase);
3368: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3369: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3370: const u_char *bptr;
3371: BIO *bio = NULL;
3372:
3373: if (len > 0 && len <= 4)
3374: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3375: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3376: return SSH_ERR_ALLOC_FAIL;
3377:
3378: switch (key->type) {
3379: case KEY_DSA:
3380: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3381: cipher, passphrase, len, NULL, NULL);
3382: break;
3383: case KEY_ECDSA:
3384: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3385: cipher, passphrase, len, NULL, NULL);
3386: break;
3387: case KEY_RSA:
3388: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3389: cipher, passphrase, len, NULL, NULL);
3390: break;
3391: default:
3392: success = 0;
3393: break;
3394: }
3395: if (success == 0) {
3396: r = SSH_ERR_LIBCRYPTO_ERROR;
3397: goto out;
3398: }
3399: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3400: r = SSH_ERR_INTERNAL_ERROR;
3401: goto out;
3402: }
3403: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3404: goto out;
3405: r = 0;
3406: out:
3407: BIO_free(bio);
3408: return r;
3409: }
3410: #endif /* WITH_OPENSSL */
3411:
3412: /* Serialise "key" to buffer "blob" */
3413: int
3414: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3415: const char *passphrase, const char *comment,
3416: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3417: {
3418: switch (key->type) {
3419: #ifdef WITH_OPENSSL
3420: case KEY_RSA1:
3421: return sshkey_private_rsa1_to_blob(key, blob,
3422: passphrase, comment);
3423: case KEY_DSA:
3424: case KEY_ECDSA:
3425: case KEY_RSA:
3426: if (force_new_format) {
3427: return sshkey_private_to_blob2(key, blob, passphrase,
3428: comment, new_format_cipher, new_format_rounds);
3429: }
3430: return sshkey_private_pem_to_blob(key, blob,
3431: passphrase, comment);
3432: #endif /* WITH_OPENSSL */
3433: case KEY_ED25519:
3434: return sshkey_private_to_blob2(key, blob, passphrase,
3435: comment, new_format_cipher, new_format_rounds);
3436: default:
3437: return SSH_ERR_KEY_TYPE_UNKNOWN;
3438: }
3439: }
3440:
3441: #ifdef WITH_SSH1
3442: /*
3443: * Parse the public, unencrypted portion of a RSA1 key.
3444: */
3445: int
3446: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3447: struct sshkey **keyp, char **commentp)
3448: {
3449: int r;
3450: struct sshkey *pub = NULL;
3451: struct sshbuf *copy = NULL;
3452:
3453: if (keyp != NULL)
3454: *keyp = NULL;
3455: if (commentp != NULL)
3456: *commentp = NULL;
3457:
3458: /* Check that it is at least big enough to contain the ID string. */
3459: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3460: return SSH_ERR_INVALID_FORMAT;
3461:
3462: /*
3463: * Make sure it begins with the id string. Consume the id string
3464: * from the buffer.
3465: */
3466: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3467: return SSH_ERR_INVALID_FORMAT;
3468: /* Make a working copy of the keyblob and skip past the magic */
3469: if ((copy = sshbuf_fromb(blob)) == NULL)
3470: return SSH_ERR_ALLOC_FAIL;
3471: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3472: goto out;
3473:
3474: /* Skip cipher type, reserved data and key bits. */
3475: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3476: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3477: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3478: goto out;
3479:
3480: /* Read the public key from the buffer. */
3481: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3482: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3483: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3484: goto out;
3485:
3486: /* Finally, the comment */
3487: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3488: goto out;
3489:
3490: /* The encrypted private part is not parsed by this function. */
3491:
3492: r = 0;
3493: if (keyp != NULL)
3494: *keyp = pub;
3495: else
3496: sshkey_free(pub);
3497: pub = NULL;
3498:
3499: out:
3500: if (copy != NULL)
3501: sshbuf_free(copy);
3502: if (pub != NULL)
3503: sshkey_free(pub);
3504: return r;
3505: }
3506:
3507: static int
3508: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3509: struct sshkey **keyp, char **commentp)
3510: {
3511: int r;
3512: u_int16_t check1, check2;
3513: u_int8_t cipher_type;
3514: struct sshbuf *decrypted = NULL, *copy = NULL;
3515: u_char *cp;
3516: char *comment = NULL;
3517: struct sshcipher_ctx ciphercontext;
3518: const struct sshcipher *cipher;
3519: struct sshkey *prv = NULL;
3520:
3521: *keyp = NULL;
3522: if (commentp != NULL)
3523: *commentp = NULL;
3524:
3525: /* Check that it is at least big enough to contain the ID string. */
3526: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3527: return SSH_ERR_INVALID_FORMAT;
3528:
3529: /*
3530: * Make sure it begins with the id string. Consume the id string
3531: * from the buffer.
3532: */
3533: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3534: return SSH_ERR_INVALID_FORMAT;
3535:
3536: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3537: r = SSH_ERR_ALLOC_FAIL;
3538: goto out;
3539: }
3540: if ((copy = sshbuf_fromb(blob)) == NULL ||
3541: (decrypted = sshbuf_new()) == NULL) {
3542: r = SSH_ERR_ALLOC_FAIL;
3543: goto out;
3544: }
3545: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3546: goto out;
3547:
3548: /* Read cipher type. */
3549: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3550: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3551: goto out;
3552:
3553: /* Read the public key and comment from the buffer. */
3554: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3555: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3556: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3557: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3558: goto out;
3559:
3560: /* Check that it is a supported cipher. */
3561: cipher = cipher_by_number(cipher_type);
3562: if (cipher == NULL) {
3563: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3564: goto out;
3565: }
3566: /* Initialize space for decrypted data. */
3567: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3568: goto out;
3569:
3570: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3571: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3572: CIPHER_DECRYPT)) != 0)
3573: goto out;
3574: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3575: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3576: cipher_cleanup(&ciphercontext);
3577: goto out;
3578: }
3579: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3580: goto out;
3581:
3582: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3583: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3584: goto out;
3585: if (check1 != check2) {
3586: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3587: goto out;
3588: }
3589:
3590: /* Read the rest of the private key. */
3591: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3592: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3593: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3594: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3595: goto out;
3596:
3597: /* calculate p-1 and q-1 */
3598: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3599: goto out;
3600:
3601: /* enable blinding */
3602: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3603: r = SSH_ERR_LIBCRYPTO_ERROR;
3604: goto out;
3605: }
3606: r = 0;
3607: *keyp = prv;
3608: prv = NULL;
3609: if (commentp != NULL) {
3610: *commentp = comment;
3611: comment = NULL;
3612: }
3613: out:
3614: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3615: if (comment != NULL)
3616: free(comment);
3617: if (prv != NULL)
3618: sshkey_free(prv);
3619: if (copy != NULL)
3620: sshbuf_free(copy);
3621: if (decrypted != NULL)
3622: sshbuf_free(decrypted);
3623: return r;
3624: }
3625: #endif /* WITH_SSH1 */
3626:
3627: #ifdef WITH_OPENSSL
3628: /* XXX make private once ssh-keysign.c fixed */
3629: int
3630: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3631: const char *passphrase, struct sshkey **keyp, char **commentp)
3632: {
3633: EVP_PKEY *pk = NULL;
3634: struct sshkey *prv = NULL;
3635: char *name = "<no key>";
3636: BIO *bio = NULL;
3637: int r;
3638:
3639: *keyp = NULL;
3640: if (commentp != NULL)
3641: *commentp = NULL;
3642:
3643: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3644: return SSH_ERR_ALLOC_FAIL;
3645: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3646: (int)sshbuf_len(blob)) {
3647: r = SSH_ERR_ALLOC_FAIL;
3648: goto out;
3649: }
3650:
3651: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3652: (char *)passphrase)) == NULL) {
3653: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3654: goto out;
3655: }
3656: if (pk->type == EVP_PKEY_RSA &&
3657: (type == KEY_UNSPEC || type == KEY_RSA)) {
3658: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3659: r = SSH_ERR_ALLOC_FAIL;
3660: goto out;
3661: }
3662: prv->rsa = EVP_PKEY_get1_RSA(pk);
3663: prv->type = KEY_RSA;
3664: name = "rsa w/o comment";
3665: #ifdef DEBUG_PK
3666: RSA_print_fp(stderr, prv->rsa, 8);
3667: #endif
3668: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3669: r = SSH_ERR_LIBCRYPTO_ERROR;
3670: goto out;
3671: }
3672: } else if (pk->type == EVP_PKEY_DSA &&
3673: (type == KEY_UNSPEC || type == KEY_DSA)) {
3674: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3675: r = SSH_ERR_ALLOC_FAIL;
3676: goto out;
3677: }
3678: prv->dsa = EVP_PKEY_get1_DSA(pk);
3679: prv->type = KEY_DSA;
3680: name = "dsa w/o comment";
3681: #ifdef DEBUG_PK
3682: DSA_print_fp(stderr, prv->dsa, 8);
3683: #endif
3684: } else if (pk->type == EVP_PKEY_EC &&
3685: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3686: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3687: r = SSH_ERR_ALLOC_FAIL;
3688: goto out;
3689: }
3690: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3691: prv->type = KEY_ECDSA;
3692: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3693: if (prv->ecdsa_nid == -1 ||
3694: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3695: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3696: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3697: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3698: r = SSH_ERR_INVALID_FORMAT;
3699: goto out;
3700: }
3701: name = "ecdsa w/o comment";
3702: #ifdef DEBUG_PK
3703: if (prv != NULL && prv->ecdsa != NULL)
3704: sshkey_dump_ec_key(prv->ecdsa);
3705: #endif
3706: } else {
3707: r = SSH_ERR_INVALID_FORMAT;
3708: goto out;
3709: }
3710: if (commentp != NULL &&
3711: (*commentp = strdup(name)) == NULL) {
3712: r = SSH_ERR_ALLOC_FAIL;
3713: goto out;
3714: }
3715: r = 0;
3716: *keyp = prv;
3717: prv = NULL;
3718: out:
3719: BIO_free(bio);
3720: if (pk != NULL)
3721: EVP_PKEY_free(pk);
3722: if (prv != NULL)
3723: sshkey_free(prv);
3724: return r;
3725: }
3726: #endif /* WITH_OPENSSL */
3727:
3728: int
3729: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3730: const char *passphrase, struct sshkey **keyp, char **commentp)
3731: {
3732: int r;
3733:
3734: *keyp = NULL;
3735: if (commentp != NULL)
3736: *commentp = NULL;
3737:
3738: switch (type) {
3739: #ifdef WITH_OPENSSL
3740: case KEY_RSA1:
3741: return sshkey_parse_private_rsa1(blob, passphrase,
3742: keyp, commentp);
3743: case KEY_DSA:
3744: case KEY_ECDSA:
3745: case KEY_RSA:
3746: return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3747: keyp, commentp);
3748: #endif /* WITH_OPENSSL */
3749: case KEY_ED25519:
3750: return sshkey_parse_private2(blob, type, passphrase,
3751: keyp, commentp);
3752: case KEY_UNSPEC:
3753: if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3754: commentp)) == 0)
3755: return 0;
3756: #ifdef WITH_OPENSSL
3757: return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3758: keyp, commentp);
3759: #else
3760: return SSH_ERR_INVALID_FORMAT;
3761: #endif /* WITH_OPENSSL */
3762: default:
3763: return SSH_ERR_KEY_TYPE_UNKNOWN;
3764: }
3765: }
3766:
3767: int
3768: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3769: const char *filename, struct sshkey **keyp, char **commentp)
3770: {
3771: int r;
3772:
3773: if (keyp != NULL)
3774: *keyp = NULL;
3775: if (commentp != NULL)
3776: *commentp = NULL;
3777:
3778: #ifdef WITH_SSH1
3779: /* it's a SSH v1 key if the public key part is readable */
3780: if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3781: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3782: passphrase, keyp, commentp);
3783: }
3784: #endif /* WITH_SSH1 */
1.2 markus 3785: if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3786: passphrase, keyp, commentp)) == 0)
3787: return 0;
1.1 djm 3788: return r;
3789: }
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