Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.7
1.7 ! djm 1: /* $OpenBSD: sshkey.c,v 1.6 2014/12/10 01:24:09 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>
1.7 ! djm 30: #include <netinet/in.h>
1.1 djm 31:
32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
35:
36: #include "crypto_api.h"
37:
38: #include <errno.h>
39: #include <stdio.h>
40: #include <string.h>
41: #include <util.h>
1.7 ! djm 42: #include <resolv.h>
1.1 djm 43:
44: #include "ssh2.h"
45: #include "ssherr.h"
46: #include "misc.h"
47: #include "sshbuf.h"
48: #include "rsa.h"
49: #include "cipher.h"
50: #include "digest.h"
51: #define SSHKEY_INTERNAL
52: #include "sshkey.h"
53:
54: /* openssh private key file format */
55: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
56: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
57: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
58: #define MARK_END_LEN (sizeof(MARK_END) - 1)
59: #define KDFNAME "bcrypt"
60: #define AUTH_MAGIC "openssh-key-v1"
61: #define SALT_LEN 16
62: #define DEFAULT_CIPHERNAME "aes256-cbc"
63: #define DEFAULT_ROUNDS 16
64:
65: /* Version identification string for SSH v1 identity files. */
66: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
67:
68: static int sshkey_from_blob_internal(const u_char *blob, size_t blen,
69: struct sshkey **keyp, int allow_cert);
70:
71: /* Supported key types */
72: struct keytype {
73: const char *name;
74: const char *shortname;
75: int type;
76: int nid;
77: int cert;
78: };
79: static const struct keytype keytypes[] = {
80: { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
81: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
82: KEY_ED25519_CERT, 0, 1 },
83: #ifdef WITH_OPENSSL
84: { NULL, "RSA1", KEY_RSA1, 0, 0 },
85: { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
86: { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
87: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
88: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
89: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
90: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
91: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
92: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
93: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
94: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
95: KEY_ECDSA_CERT, NID_secp384r1, 1 },
96: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
97: KEY_ECDSA_CERT, NID_secp521r1, 1 },
98: { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
99: KEY_RSA_CERT_V00, 0, 1 },
100: { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
101: KEY_DSA_CERT_V00, 0, 1 },
102: #endif /* WITH_OPENSSL */
103: { NULL, NULL, -1, -1, 0 }
104: };
105:
106: const char *
107: sshkey_type(const struct sshkey *k)
108: {
109: const struct keytype *kt;
110:
111: for (kt = keytypes; kt->type != -1; kt++) {
112: if (kt->type == k->type)
113: return kt->shortname;
114: }
115: return "unknown";
116: }
117:
118: static const char *
119: sshkey_ssh_name_from_type_nid(int type, int nid)
120: {
121: const struct keytype *kt;
122:
123: for (kt = keytypes; kt->type != -1; kt++) {
124: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
125: return kt->name;
126: }
127: return "ssh-unknown";
128: }
129:
130: int
131: sshkey_type_is_cert(int type)
132: {
133: const struct keytype *kt;
134:
135: for (kt = keytypes; kt->type != -1; kt++) {
136: if (kt->type == type)
137: return kt->cert;
138: }
139: return 0;
140: }
141:
142: const char *
143: sshkey_ssh_name(const struct sshkey *k)
144: {
145: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
146: }
147:
148: const char *
149: sshkey_ssh_name_plain(const struct sshkey *k)
150: {
151: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
152: k->ecdsa_nid);
153: }
154:
155: int
156: sshkey_type_from_name(const char *name)
157: {
158: const struct keytype *kt;
159:
160: for (kt = keytypes; kt->type != -1; kt++) {
161: /* Only allow shortname matches for plain key types */
162: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
163: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
164: return kt->type;
165: }
166: return KEY_UNSPEC;
167: }
168:
169: int
170: sshkey_ecdsa_nid_from_name(const char *name)
171: {
172: const struct keytype *kt;
173:
1.4 djm 174: for (kt = keytypes; kt->type != -1; kt++) {
175: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
176: continue;
177: if (kt->name != NULL && strcmp(name, kt->name) == 0)
178: return kt->nid;
179: }
1.1 djm 180: return -1;
181: }
182:
183: char *
184: key_alg_list(int certs_only, int plain_only)
185: {
186: char *tmp, *ret = NULL;
187: size_t nlen, rlen = 0;
188: const struct keytype *kt;
189:
190: for (kt = keytypes; kt->type != -1; kt++) {
191: if (kt->name == NULL)
192: continue;
193: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
194: continue;
195: if (ret != NULL)
196: ret[rlen++] = '\n';
197: nlen = strlen(kt->name);
198: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
199: free(ret);
200: return NULL;
201: }
202: ret = tmp;
203: memcpy(ret + rlen, kt->name, nlen + 1);
204: rlen += nlen;
205: }
206: return ret;
207: }
208:
209: int
210: sshkey_names_valid2(const char *names)
211: {
212: char *s, *cp, *p;
213:
214: if (names == NULL || strcmp(names, "") == 0)
215: return 0;
216: if ((s = cp = strdup(names)) == NULL)
217: return 0;
218: for ((p = strsep(&cp, ",")); p && *p != '\0';
219: (p = strsep(&cp, ","))) {
220: switch (sshkey_type_from_name(p)) {
221: case KEY_RSA1:
222: case KEY_UNSPEC:
223: free(s);
224: return 0;
225: }
226: }
227: free(s);
228: return 1;
229: }
230:
231: u_int
232: sshkey_size(const struct sshkey *k)
233: {
234: switch (k->type) {
235: #ifdef WITH_OPENSSL
236: case KEY_RSA1:
237: case KEY_RSA:
238: case KEY_RSA_CERT_V00:
239: case KEY_RSA_CERT:
240: return BN_num_bits(k->rsa->n);
241: case KEY_DSA:
242: case KEY_DSA_CERT_V00:
243: case KEY_DSA_CERT:
244: return BN_num_bits(k->dsa->p);
245: case KEY_ECDSA:
246: case KEY_ECDSA_CERT:
247: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
248: #endif /* WITH_OPENSSL */
249: case KEY_ED25519:
250: case KEY_ED25519_CERT:
251: return 256; /* XXX */
252: }
253: return 0;
254: }
255:
256: int
257: sshkey_cert_is_legacy(const struct sshkey *k)
258: {
259: switch (k->type) {
260: case KEY_DSA_CERT_V00:
261: case KEY_RSA_CERT_V00:
262: return 1;
263: default:
264: return 0;
265: }
266: }
267:
268: static int
269: sshkey_type_is_valid_ca(int type)
270: {
271: switch (type) {
272: case KEY_RSA:
273: case KEY_DSA:
274: case KEY_ECDSA:
275: case KEY_ED25519:
276: return 1;
277: default:
278: return 0;
279: }
280: }
281:
282: int
283: sshkey_is_cert(const struct sshkey *k)
284: {
285: if (k == NULL)
286: return 0;
287: return sshkey_type_is_cert(k->type);
288: }
289:
290: /* Return the cert-less equivalent to a certified key type */
291: int
292: sshkey_type_plain(int type)
293: {
294: switch (type) {
295: case KEY_RSA_CERT_V00:
296: case KEY_RSA_CERT:
297: return KEY_RSA;
298: case KEY_DSA_CERT_V00:
299: case KEY_DSA_CERT:
300: return KEY_DSA;
301: case KEY_ECDSA_CERT:
302: return KEY_ECDSA;
303: case KEY_ED25519_CERT:
304: return KEY_ED25519;
305: default:
306: return type;
307: }
308: }
309:
310: #ifdef WITH_OPENSSL
311: /* XXX: these are really begging for a table-driven approach */
312: int
313: sshkey_curve_name_to_nid(const char *name)
314: {
315: if (strcmp(name, "nistp256") == 0)
316: return NID_X9_62_prime256v1;
317: else if (strcmp(name, "nistp384") == 0)
318: return NID_secp384r1;
319: else if (strcmp(name, "nistp521") == 0)
320: return NID_secp521r1;
321: else
322: return -1;
323: }
324:
325: u_int
326: sshkey_curve_nid_to_bits(int nid)
327: {
328: switch (nid) {
329: case NID_X9_62_prime256v1:
330: return 256;
331: case NID_secp384r1:
332: return 384;
333: case NID_secp521r1:
334: return 521;
335: default:
336: return 0;
337: }
338: }
339:
340: int
341: sshkey_ecdsa_bits_to_nid(int bits)
342: {
343: switch (bits) {
344: case 256:
345: return NID_X9_62_prime256v1;
346: case 384:
347: return NID_secp384r1;
348: case 521:
349: return NID_secp521r1;
350: default:
351: return -1;
352: }
353: }
354:
355: const char *
356: sshkey_curve_nid_to_name(int nid)
357: {
358: switch (nid) {
359: case NID_X9_62_prime256v1:
360: return "nistp256";
361: case NID_secp384r1:
362: return "nistp384";
363: case NID_secp521r1:
364: return "nistp521";
365: default:
366: return NULL;
367: }
368: }
369:
370: int
371: sshkey_ec_nid_to_hash_alg(int nid)
372: {
373: int kbits = sshkey_curve_nid_to_bits(nid);
374:
375: if (kbits <= 0)
376: return -1;
377:
378: /* RFC5656 section 6.2.1 */
379: if (kbits <= 256)
380: return SSH_DIGEST_SHA256;
381: else if (kbits <= 384)
382: return SSH_DIGEST_SHA384;
383: else
384: return SSH_DIGEST_SHA512;
385: }
386: #endif /* WITH_OPENSSL */
387:
388: static void
389: cert_free(struct sshkey_cert *cert)
390: {
391: u_int i;
392:
393: if (cert == NULL)
394: return;
395: if (cert->certblob != NULL)
396: sshbuf_free(cert->certblob);
397: if (cert->critical != NULL)
398: sshbuf_free(cert->critical);
399: if (cert->extensions != NULL)
400: sshbuf_free(cert->extensions);
401: if (cert->key_id != NULL)
402: free(cert->key_id);
403: for (i = 0; i < cert->nprincipals; i++)
404: free(cert->principals[i]);
405: if (cert->principals != NULL)
406: free(cert->principals);
407: if (cert->signature_key != NULL)
408: sshkey_free(cert->signature_key);
409: explicit_bzero(cert, sizeof(*cert));
410: free(cert);
411: }
412:
413: static struct sshkey_cert *
414: cert_new(void)
415: {
416: struct sshkey_cert *cert;
417:
418: if ((cert = calloc(1, sizeof(*cert))) == NULL)
419: return NULL;
420: if ((cert->certblob = sshbuf_new()) == NULL ||
421: (cert->critical = sshbuf_new()) == NULL ||
422: (cert->extensions = sshbuf_new()) == NULL) {
423: cert_free(cert);
424: return NULL;
425: }
426: cert->key_id = NULL;
427: cert->principals = NULL;
428: cert->signature_key = NULL;
429: return cert;
430: }
431:
432: struct sshkey *
433: sshkey_new(int type)
434: {
435: struct sshkey *k;
436: #ifdef WITH_OPENSSL
437: RSA *rsa;
438: DSA *dsa;
439: #endif /* WITH_OPENSSL */
440:
441: if ((k = calloc(1, sizeof(*k))) == NULL)
442: return NULL;
443: k->type = type;
444: k->ecdsa = NULL;
445: k->ecdsa_nid = -1;
446: k->dsa = NULL;
447: k->rsa = NULL;
448: k->cert = NULL;
449: k->ed25519_sk = NULL;
450: k->ed25519_pk = NULL;
451: switch (k->type) {
452: #ifdef WITH_OPENSSL
453: case KEY_RSA1:
454: case KEY_RSA:
455: case KEY_RSA_CERT_V00:
456: case KEY_RSA_CERT:
457: if ((rsa = RSA_new()) == NULL ||
458: (rsa->n = BN_new()) == NULL ||
459: (rsa->e = BN_new()) == NULL) {
460: if (rsa != NULL)
461: RSA_free(rsa);
462: free(k);
463: return NULL;
464: }
465: k->rsa = rsa;
466: break;
467: case KEY_DSA:
468: case KEY_DSA_CERT_V00:
469: case KEY_DSA_CERT:
470: if ((dsa = DSA_new()) == NULL ||
471: (dsa->p = BN_new()) == NULL ||
472: (dsa->q = BN_new()) == NULL ||
473: (dsa->g = BN_new()) == NULL ||
474: (dsa->pub_key = BN_new()) == NULL) {
475: if (dsa != NULL)
476: DSA_free(dsa);
477: free(k);
478: return NULL;
479: }
480: k->dsa = dsa;
481: break;
482: case KEY_ECDSA:
483: case KEY_ECDSA_CERT:
484: /* Cannot do anything until we know the group */
485: break;
486: #endif /* WITH_OPENSSL */
487: case KEY_ED25519:
488: case KEY_ED25519_CERT:
489: /* no need to prealloc */
490: break;
491: case KEY_UNSPEC:
492: break;
493: default:
494: free(k);
495: return NULL;
496: break;
497: }
498:
499: if (sshkey_is_cert(k)) {
500: if ((k->cert = cert_new()) == NULL) {
501: sshkey_free(k);
502: return NULL;
503: }
504: }
505:
506: return k;
507: }
508:
509: int
510: sshkey_add_private(struct sshkey *k)
511: {
512: switch (k->type) {
513: #ifdef WITH_OPENSSL
514: case KEY_RSA1:
515: case KEY_RSA:
516: case KEY_RSA_CERT_V00:
517: case KEY_RSA_CERT:
518: #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
519: if (bn_maybe_alloc_failed(k->rsa->d) ||
520: bn_maybe_alloc_failed(k->rsa->iqmp) ||
521: bn_maybe_alloc_failed(k->rsa->q) ||
522: bn_maybe_alloc_failed(k->rsa->p) ||
523: bn_maybe_alloc_failed(k->rsa->dmq1) ||
524: bn_maybe_alloc_failed(k->rsa->dmp1))
525: return SSH_ERR_ALLOC_FAIL;
526: break;
527: case KEY_DSA:
528: case KEY_DSA_CERT_V00:
529: case KEY_DSA_CERT:
530: if (bn_maybe_alloc_failed(k->dsa->priv_key))
531: return SSH_ERR_ALLOC_FAIL;
532: break;
533: #undef bn_maybe_alloc_failed
534: case KEY_ECDSA:
535: case KEY_ECDSA_CERT:
536: /* Cannot do anything until we know the group */
537: break;
538: #endif /* WITH_OPENSSL */
539: case KEY_ED25519:
540: case KEY_ED25519_CERT:
541: /* no need to prealloc */
542: break;
543: case KEY_UNSPEC:
544: break;
545: default:
546: return SSH_ERR_INVALID_ARGUMENT;
547: }
548: return 0;
549: }
550:
551: struct sshkey *
552: sshkey_new_private(int type)
553: {
554: struct sshkey *k = sshkey_new(type);
555:
556: if (k == NULL)
557: return NULL;
558: if (sshkey_add_private(k) != 0) {
559: sshkey_free(k);
560: return NULL;
561: }
562: return k;
563: }
564:
565: void
566: sshkey_free(struct sshkey *k)
567: {
568: if (k == NULL)
569: return;
570: switch (k->type) {
571: #ifdef WITH_OPENSSL
572: case KEY_RSA1:
573: case KEY_RSA:
574: case KEY_RSA_CERT_V00:
575: case KEY_RSA_CERT:
576: if (k->rsa != NULL)
577: RSA_free(k->rsa);
578: k->rsa = NULL;
579: break;
580: case KEY_DSA:
581: case KEY_DSA_CERT_V00:
582: case KEY_DSA_CERT:
583: if (k->dsa != NULL)
584: DSA_free(k->dsa);
585: k->dsa = NULL;
586: break;
587: case KEY_ECDSA:
588: case KEY_ECDSA_CERT:
589: if (k->ecdsa != NULL)
590: EC_KEY_free(k->ecdsa);
591: k->ecdsa = NULL;
592: break;
593: #endif /* WITH_OPENSSL */
594: case KEY_ED25519:
595: case KEY_ED25519_CERT:
596: if (k->ed25519_pk) {
597: explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
598: free(k->ed25519_pk);
599: k->ed25519_pk = NULL;
600: }
601: if (k->ed25519_sk) {
602: explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
603: free(k->ed25519_sk);
604: k->ed25519_sk = NULL;
605: }
606: break;
607: case KEY_UNSPEC:
608: break;
609: default:
610: break;
611: }
612: if (sshkey_is_cert(k))
613: cert_free(k->cert);
614: explicit_bzero(k, sizeof(*k));
615: free(k);
616: }
617:
618: static int
619: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
620: {
621: if (a == NULL && b == NULL)
622: return 1;
623: if (a == NULL || b == NULL)
624: return 0;
625: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
626: return 0;
627: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
628: sshbuf_len(a->certblob)) != 0)
629: return 0;
630: return 1;
631: }
632:
633: /*
634: * Compare public portions of key only, allowing comparisons between
635: * certificates and plain keys too.
636: */
637: int
638: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
639: {
640: #ifdef WITH_OPENSSL
641: BN_CTX *bnctx;
642: #endif /* WITH_OPENSSL */
643:
644: if (a == NULL || b == NULL ||
645: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
646: return 0;
647:
648: switch (a->type) {
649: #ifdef WITH_OPENSSL
650: case KEY_RSA1:
651: case KEY_RSA_CERT_V00:
652: case KEY_RSA_CERT:
653: case KEY_RSA:
654: return a->rsa != NULL && b->rsa != NULL &&
655: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
656: BN_cmp(a->rsa->n, b->rsa->n) == 0;
657: case KEY_DSA_CERT_V00:
658: case KEY_DSA_CERT:
659: case KEY_DSA:
660: return a->dsa != NULL && b->dsa != NULL &&
661: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
662: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
663: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
664: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
665: case KEY_ECDSA_CERT:
666: case KEY_ECDSA:
667: if (a->ecdsa == NULL || b->ecdsa == NULL ||
668: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
669: EC_KEY_get0_public_key(b->ecdsa) == NULL)
670: return 0;
671: if ((bnctx = BN_CTX_new()) == NULL)
672: return 0;
673: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
674: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
675: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
676: EC_KEY_get0_public_key(a->ecdsa),
677: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
678: BN_CTX_free(bnctx);
679: return 0;
680: }
681: BN_CTX_free(bnctx);
682: return 1;
683: #endif /* WITH_OPENSSL */
684: case KEY_ED25519:
685: case KEY_ED25519_CERT:
686: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
687: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
688: default:
689: return 0;
690: }
691: /* NOTREACHED */
692: }
693:
694: int
695: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
696: {
697: if (a == NULL || b == NULL || a->type != b->type)
698: return 0;
699: if (sshkey_is_cert(a)) {
700: if (!cert_compare(a->cert, b->cert))
701: return 0;
702: }
703: return sshkey_equal_public(a, b);
704: }
705:
706: static int
707: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
708: {
709: int type, ret = SSH_ERR_INTERNAL_ERROR;
710: const char *typename;
711:
712: if (key == NULL)
713: return SSH_ERR_INVALID_ARGUMENT;
714:
715: type = force_plain ? sshkey_type_plain(key->type) : key->type;
716: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
717:
718: switch (type) {
719: #ifdef WITH_OPENSSL
720: case KEY_DSA_CERT_V00:
721: case KEY_RSA_CERT_V00:
722: case KEY_DSA_CERT:
723: case KEY_ECDSA_CERT:
724: case KEY_RSA_CERT:
725: #endif /* WITH_OPENSSL */
726: case KEY_ED25519_CERT:
727: /* Use the existing blob */
728: /* XXX modified flag? */
729: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
730: return ret;
731: break;
732: #ifdef WITH_OPENSSL
733: case KEY_DSA:
734: if (key->dsa == NULL)
735: return SSH_ERR_INVALID_ARGUMENT;
736: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
737: (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
738: (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
739: (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
740: (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
741: return ret;
742: break;
743: case KEY_ECDSA:
744: if (key->ecdsa == NULL)
745: return SSH_ERR_INVALID_ARGUMENT;
746: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
747: (ret = sshbuf_put_cstring(b,
748: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
749: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
750: return ret;
751: break;
752: case KEY_RSA:
753: if (key->rsa == NULL)
754: return SSH_ERR_INVALID_ARGUMENT;
755: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
756: (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
757: (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
758: return ret;
759: break;
760: #endif /* WITH_OPENSSL */
761: case KEY_ED25519:
762: if (key->ed25519_pk == NULL)
763: return SSH_ERR_INVALID_ARGUMENT;
764: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
765: (ret = sshbuf_put_string(b,
766: key->ed25519_pk, ED25519_PK_SZ)) != 0)
767: return ret;
768: break;
769: default:
770: return SSH_ERR_KEY_TYPE_UNKNOWN;
771: }
772: return 0;
773: }
774:
775: int
776: sshkey_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
777: {
778: return to_blob_buf(key, b, 0);
779: }
780:
781: int
782: sshkey_plain_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
783: {
784: return to_blob_buf(key, b, 1);
785: }
786:
787: static int
788: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
789: {
790: int ret = SSH_ERR_INTERNAL_ERROR;
791: size_t len;
792: struct sshbuf *b = NULL;
793:
794: if (lenp != NULL)
795: *lenp = 0;
796: if (blobp != NULL)
797: *blobp = NULL;
798: if ((b = sshbuf_new()) == NULL)
799: return SSH_ERR_ALLOC_FAIL;
800: if ((ret = to_blob_buf(key, b, force_plain)) != 0)
801: goto out;
802: len = sshbuf_len(b);
803: if (lenp != NULL)
804: *lenp = len;
805: if (blobp != NULL) {
806: if ((*blobp = malloc(len)) == NULL) {
807: ret = SSH_ERR_ALLOC_FAIL;
808: goto out;
809: }
810: memcpy(*blobp, sshbuf_ptr(b), len);
811: }
812: ret = 0;
813: out:
814: sshbuf_free(b);
815: return ret;
816: }
817:
818: int
819: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
820: {
821: return to_blob(key, blobp, lenp, 0);
822: }
823:
824: int
825: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
826: {
827: return to_blob(key, blobp, lenp, 1);
828: }
829:
830: int
1.7 ! djm 831: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 832: u_char **retp, size_t *lenp)
833: {
834: u_char *blob = NULL, *ret = NULL;
835: size_t blob_len = 0;
1.7 ! djm 836: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 837:
838: if (retp != NULL)
839: *retp = NULL;
840: if (lenp != NULL)
841: *lenp = 0;
1.7 ! djm 842: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 843: r = SSH_ERR_INVALID_ARGUMENT;
844: goto out;
845: }
846:
847: if (k->type == KEY_RSA1) {
848: #ifdef WITH_OPENSSL
849: int nlen = BN_num_bytes(k->rsa->n);
850: int elen = BN_num_bytes(k->rsa->e);
851:
852: blob_len = nlen + elen;
853: if (nlen >= INT_MAX - elen ||
854: (blob = malloc(blob_len)) == NULL) {
855: r = SSH_ERR_ALLOC_FAIL;
856: goto out;
857: }
858: BN_bn2bin(k->rsa->n, blob);
859: BN_bn2bin(k->rsa->e, blob + nlen);
860: #endif /* WITH_OPENSSL */
861: } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
862: goto out;
863: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
864: r = SSH_ERR_ALLOC_FAIL;
865: goto out;
866: }
1.7 ! djm 867: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 868: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
869: goto out;
870: /* success */
871: if (retp != NULL) {
872: *retp = ret;
873: ret = NULL;
874: }
875: if (lenp != NULL)
1.7 ! djm 876: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 877: r = 0;
878: out:
879: free(ret);
880: if (blob != NULL) {
881: explicit_bzero(blob, blob_len);
882: free(blob);
883: }
884: return r;
885: }
886:
887: static char *
1.7 ! djm 888: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
! 889: {
! 890: char *ret;
! 891: size_t plen = strlen(alg) + 1;
! 892: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
! 893: int r;
! 894:
! 895: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
! 896: return NULL;
! 897: strlcpy(ret, alg, rlen);
! 898: strlcat(ret, ":", rlen);
! 899: if (dgst_raw_len == 0)
! 900: return ret;
! 901: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
! 902: ret + plen, rlen - plen)) == -1) {
! 903: explicit_bzero(ret, rlen);
! 904: free(ret);
! 905: return NULL;
! 906: }
! 907: /* Trim padding characters from end */
! 908: ret[strcspn(ret, "=")] = '\0';
! 909: return ret;
! 910: }
! 911:
! 912: static char *
! 913: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 914: {
1.7 ! djm 915: char *retval, hex[5];
! 916: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 917:
1.7 ! djm 918: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 919: return NULL;
1.7 ! djm 920: strlcpy(retval, alg, rlen);
! 921: strlcat(retval, ":", rlen);
1.1 djm 922: for (i = 0; i < dgst_raw_len; i++) {
1.7 ! djm 923: snprintf(hex, sizeof(hex), "%s%02x",
! 924: i > 0 ? ":" : "", dgst_raw[i]);
! 925: strlcat(retval, hex, rlen);
1.1 djm 926: }
927: return retval;
928: }
929:
930: static char *
931: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
932: {
933: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
934: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
935: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
936: u_int i, j = 0, rounds, seed = 1;
937: char *retval;
938:
939: rounds = (dgst_raw_len / 2) + 1;
940: if ((retval = calloc(rounds, 6)) == NULL)
941: return NULL;
942: retval[j++] = 'x';
943: for (i = 0; i < rounds; i++) {
944: u_int idx0, idx1, idx2, idx3, idx4;
945: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
946: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
947: seed) % 6;
948: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
949: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
950: (seed / 6)) % 6;
951: retval[j++] = vowels[idx0];
952: retval[j++] = consonants[idx1];
953: retval[j++] = vowels[idx2];
954: if ((i + 1) < rounds) {
955: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
956: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
957: retval[j++] = consonants[idx3];
958: retval[j++] = '-';
959: retval[j++] = consonants[idx4];
960: seed = ((seed * 5) +
961: ((((u_int)(dgst_raw[2 * i])) * 7) +
962: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
963: }
964: } else {
965: idx0 = seed % 6;
966: idx1 = 16;
967: idx2 = seed / 6;
968: retval[j++] = vowels[idx0];
969: retval[j++] = consonants[idx1];
970: retval[j++] = vowels[idx2];
971: }
972: }
973: retval[j++] = 'x';
974: retval[j++] = '\0';
975: return retval;
976: }
977:
978: /*
979: * Draw an ASCII-Art representing the fingerprint so human brain can
980: * profit from its built-in pattern recognition ability.
981: * This technique is called "random art" and can be found in some
982: * scientific publications like this original paper:
983: *
984: * "Hash Visualization: a New Technique to improve Real-World Security",
985: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
986: * Techniques and E-Commerce (CrypTEC '99)
987: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
988: *
989: * The subject came up in a talk by Dan Kaminsky, too.
990: *
991: * If you see the picture is different, the key is different.
992: * If the picture looks the same, you still know nothing.
993: *
994: * The algorithm used here is a worm crawling over a discrete plane,
995: * leaving a trace (augmenting the field) everywhere it goes.
996: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
997: * makes the respective movement vector be ignored for this turn.
998: * Graphs are not unambiguous, because circles in graphs can be
999: * walked in either direction.
1000: */
1001:
1002: /*
1003: * Field sizes for the random art. Have to be odd, so the starting point
1004: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1005: * Else pictures would be too dense, and drawing the frame would
1006: * fail, too, because the key type would not fit in anymore.
1007: */
1008: #define FLDBASE 8
1009: #define FLDSIZE_Y (FLDBASE + 1)
1010: #define FLDSIZE_X (FLDBASE * 2 + 1)
1011: static char *
1.7 ! djm 1012: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1013: const struct sshkey *k)
1014: {
1015: /*
1016: * Chars to be used after each other every time the worm
1017: * intersects with itself. Matter of taste.
1018: */
1019: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 ! djm 1020: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1021: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 ! djm 1022: size_t i, tlen, hlen;
1.1 djm 1023: u_int b;
1.3 djm 1024: int x, y, r;
1.1 djm 1025: size_t len = strlen(augmentation_string) - 1;
1026:
1027: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1028: return NULL;
1029:
1030: /* initialize field */
1031: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1032: x = FLDSIZE_X / 2;
1033: y = FLDSIZE_Y / 2;
1034:
1035: /* process raw key */
1036: for (i = 0; i < dgst_raw_len; i++) {
1037: int input;
1038: /* each byte conveys four 2-bit move commands */
1039: input = dgst_raw[i];
1040: for (b = 0; b < 4; b++) {
1041: /* evaluate 2 bit, rest is shifted later */
1042: x += (input & 0x1) ? 1 : -1;
1043: y += (input & 0x2) ? 1 : -1;
1044:
1045: /* assure we are still in bounds */
1046: x = MAX(x, 0);
1047: y = MAX(y, 0);
1048: x = MIN(x, FLDSIZE_X - 1);
1049: y = MIN(y, FLDSIZE_Y - 1);
1050:
1051: /* augment the field */
1052: if (field[x][y] < len - 2)
1053: field[x][y]++;
1054: input = input >> 2;
1055: }
1056: }
1057:
1058: /* mark starting point and end point*/
1059: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1060: field[x][y] = len;
1061:
1.3 djm 1062: /* assemble title */
1063: r = snprintf(title, sizeof(title), "[%s %u]",
1064: sshkey_type(k), sshkey_size(k));
1065: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1066: if (r < 0 || r > (int)sizeof(title))
1.7 ! djm 1067: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
! 1068: tlen = (r <= 0) ? 0 : strlen(title);
! 1069:
! 1070: /* assemble hash ID. */
! 1071: r = snprintf(hash, sizeof(hash), "[%s]", alg);
! 1072: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1073:
1074: /* output upper border */
1.3 djm 1075: p = retval;
1076: *p++ = '+';
1077: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1078: *p++ = '-';
1079: memcpy(p, title, tlen);
1080: p += tlen;
1.7 ! djm 1081: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1082: *p++ = '-';
1083: *p++ = '+';
1084: *p++ = '\n';
1085:
1086: /* output content */
1087: for (y = 0; y < FLDSIZE_Y; y++) {
1088: *p++ = '|';
1089: for (x = 0; x < FLDSIZE_X; x++)
1090: *p++ = augmentation_string[MIN(field[x][y], len)];
1091: *p++ = '|';
1092: *p++ = '\n';
1093: }
1094:
1095: /* output lower border */
1096: *p++ = '+';
1.7 ! djm 1097: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
! 1098: *p++ = '-';
! 1099: memcpy(p, hash, hlen);
! 1100: p += hlen;
! 1101: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1102: *p++ = '-';
1103: *p++ = '+';
1104:
1105: return retval;
1106: }
1107:
1108: char *
1.7 ! djm 1109: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1110: enum sshkey_fp_rep dgst_rep)
1111: {
1112: char *retval = NULL;
1113: u_char *dgst_raw;
1114: size_t dgst_raw_len;
1115:
1.7 ! djm 1116: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1117: return NULL;
1118: switch (dgst_rep) {
1.7 ! djm 1119: case SSH_FP_DEFAULT:
! 1120: if (dgst_alg == SSH_DIGEST_MD5) {
! 1121: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
! 1122: dgst_raw, dgst_raw_len);
! 1123: } else {
! 1124: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
! 1125: dgst_raw, dgst_raw_len);
! 1126: }
! 1127: break;
1.1 djm 1128: case SSH_FP_HEX:
1.7 ! djm 1129: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
! 1130: dgst_raw, dgst_raw_len);
! 1131: break;
! 1132: case SSH_FP_BASE64:
! 1133: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
! 1134: dgst_raw, dgst_raw_len);
1.1 djm 1135: break;
1136: case SSH_FP_BUBBLEBABBLE:
1137: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1138: break;
1139: case SSH_FP_RANDOMART:
1.7 ! djm 1140: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
! 1141: dgst_raw, dgst_raw_len, k);
1.1 djm 1142: break;
1143: default:
1144: explicit_bzero(dgst_raw, dgst_raw_len);
1145: free(dgst_raw);
1146: return NULL;
1147: }
1148: explicit_bzero(dgst_raw, dgst_raw_len);
1149: free(dgst_raw);
1150: return retval;
1151: }
1152:
1153: #ifdef WITH_SSH1
1154: /*
1155: * Reads a multiple-precision integer in decimal from the buffer, and advances
1156: * the pointer. The integer must already be initialized. This function is
1157: * permitted to modify the buffer. This leaves *cpp to point just beyond the
1158: * last processed character.
1159: */
1160: static int
1161: read_decimal_bignum(char **cpp, BIGNUM *v)
1162: {
1163: char *cp;
1164: size_t e;
1165: int skip = 1; /* skip white space */
1166:
1167: cp = *cpp;
1168: while (*cp == ' ' || *cp == '\t')
1169: cp++;
1170: e = strspn(cp, "0123456789");
1171: if (e == 0)
1172: return SSH_ERR_INVALID_FORMAT;
1173: if (e > SSHBUF_MAX_BIGNUM * 3)
1174: return SSH_ERR_BIGNUM_TOO_LARGE;
1175: if (cp[e] == '\0')
1176: skip = 0;
1177: else if (index(" \t\r\n", cp[e]) == NULL)
1178: return SSH_ERR_INVALID_FORMAT;
1179: cp[e] = '\0';
1180: if (BN_dec2bn(&v, cp) <= 0)
1181: return SSH_ERR_INVALID_FORMAT;
1182: *cpp = cp + e + skip;
1183: return 0;
1184: }
1185: #endif /* WITH_SSH1 */
1186:
1187: /* returns 0 ok, and < 0 error */
1188: int
1189: sshkey_read(struct sshkey *ret, char **cpp)
1190: {
1191: struct sshkey *k;
1192: int retval = SSH_ERR_INVALID_FORMAT;
1193: char *cp, *space;
1194: int r, type, curve_nid = -1;
1195: struct sshbuf *blob;
1196: #ifdef WITH_SSH1
1197: char *ep;
1198: u_long bits;
1199: #endif /* WITH_SSH1 */
1200:
1201: cp = *cpp;
1202:
1203: switch (ret->type) {
1204: case KEY_RSA1:
1205: #ifdef WITH_SSH1
1206: /* Get number of bits. */
1207: bits = strtoul(cp, &ep, 10);
1208: if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1209: bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1210: return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1211: /* Get public exponent, public modulus. */
1212: if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1213: return r;
1214: if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1215: return r;
1216: *cpp = ep;
1217: /* validate the claimed number of bits */
1218: if (BN_num_bits(ret->rsa->n) != (int)bits)
1219: return SSH_ERR_KEY_BITS_MISMATCH;
1220: retval = 0;
1221: #endif /* WITH_SSH1 */
1222: break;
1223: case KEY_UNSPEC:
1224: case KEY_RSA:
1225: case KEY_DSA:
1226: case KEY_ECDSA:
1227: case KEY_ED25519:
1228: case KEY_DSA_CERT_V00:
1229: case KEY_RSA_CERT_V00:
1230: case KEY_DSA_CERT:
1231: case KEY_ECDSA_CERT:
1232: case KEY_RSA_CERT:
1233: case KEY_ED25519_CERT:
1234: space = strchr(cp, ' ');
1235: if (space == NULL)
1236: return SSH_ERR_INVALID_FORMAT;
1237: *space = '\0';
1238: type = sshkey_type_from_name(cp);
1239: if (sshkey_type_plain(type) == KEY_ECDSA &&
1240: (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1241: return SSH_ERR_EC_CURVE_INVALID;
1242: *space = ' ';
1243: if (type == KEY_UNSPEC)
1244: return SSH_ERR_INVALID_FORMAT;
1245: cp = space+1;
1246: if (*cp == '\0')
1247: return SSH_ERR_INVALID_FORMAT;
1.5 djm 1248: if (ret->type != KEY_UNSPEC && ret->type != type)
1.1 djm 1249: return SSH_ERR_KEY_TYPE_MISMATCH;
1250: if ((blob = sshbuf_new()) == NULL)
1251: return SSH_ERR_ALLOC_FAIL;
1252: /* trim comment */
1253: space = strchr(cp, ' ');
1254: if (space)
1255: *space = '\0';
1256: if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1257: sshbuf_free(blob);
1258: return r;
1259: }
1260: if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1261: sshbuf_len(blob), &k)) != 0) {
1262: sshbuf_free(blob);
1263: return r;
1264: }
1265: sshbuf_free(blob);
1266: if (k->type != type) {
1267: sshkey_free(k);
1268: return SSH_ERR_KEY_TYPE_MISMATCH;
1269: }
1270: if (sshkey_type_plain(type) == KEY_ECDSA &&
1271: curve_nid != k->ecdsa_nid) {
1272: sshkey_free(k);
1273: return SSH_ERR_EC_CURVE_MISMATCH;
1274: }
1.5 djm 1275: ret->type = type;
1.1 djm 1276: if (sshkey_is_cert(ret)) {
1277: if (!sshkey_is_cert(k)) {
1278: sshkey_free(k);
1279: return SSH_ERR_EXPECTED_CERT;
1280: }
1281: if (ret->cert != NULL)
1282: cert_free(ret->cert);
1283: ret->cert = k->cert;
1284: k->cert = NULL;
1285: }
1286: #ifdef WITH_OPENSSL
1287: if (sshkey_type_plain(ret->type) == KEY_RSA) {
1288: if (ret->rsa != NULL)
1289: RSA_free(ret->rsa);
1290: ret->rsa = k->rsa;
1291: k->rsa = NULL;
1292: #ifdef DEBUG_PK
1293: RSA_print_fp(stderr, ret->rsa, 8);
1294: #endif
1295: }
1296: if (sshkey_type_plain(ret->type) == KEY_DSA) {
1297: if (ret->dsa != NULL)
1298: DSA_free(ret->dsa);
1299: ret->dsa = k->dsa;
1300: k->dsa = NULL;
1301: #ifdef DEBUG_PK
1302: DSA_print_fp(stderr, ret->dsa, 8);
1303: #endif
1304: }
1305: if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1306: if (ret->ecdsa != NULL)
1307: EC_KEY_free(ret->ecdsa);
1308: ret->ecdsa = k->ecdsa;
1309: ret->ecdsa_nid = k->ecdsa_nid;
1310: k->ecdsa = NULL;
1311: k->ecdsa_nid = -1;
1312: #ifdef DEBUG_PK
1313: sshkey_dump_ec_key(ret->ecdsa);
1314: #endif
1315: }
1316: #endif /* WITH_OPENSSL */
1317: if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1318: free(ret->ed25519_pk);
1319: ret->ed25519_pk = k->ed25519_pk;
1320: k->ed25519_pk = NULL;
1321: #ifdef DEBUG_PK
1322: /* XXX */
1323: #endif
1324: }
1325: retval = 0;
1326: /*XXXX*/
1327: sshkey_free(k);
1328: if (retval != 0)
1329: break;
1330: /* advance cp: skip whitespace and data */
1331: while (*cp == ' ' || *cp == '\t')
1332: cp++;
1333: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
1334: cp++;
1335: *cpp = cp;
1336: break;
1337: default:
1338: return SSH_ERR_INVALID_ARGUMENT;
1339: }
1340: return retval;
1341: }
1342:
1343: int
1344: sshkey_write(const struct sshkey *key, FILE *f)
1345: {
1346: int ret = SSH_ERR_INTERNAL_ERROR;
1347: struct sshbuf *b = NULL, *bb = NULL;
1348: char *uu = NULL;
1349: #ifdef WITH_SSH1
1350: u_int bits = 0;
1351: char *dec_e = NULL, *dec_n = NULL;
1352: #endif /* WITH_SSH1 */
1353:
1354: if (sshkey_is_cert(key)) {
1355: if (key->cert == NULL)
1356: return SSH_ERR_EXPECTED_CERT;
1357: if (sshbuf_len(key->cert->certblob) == 0)
1358: return SSH_ERR_KEY_LACKS_CERTBLOB;
1359: }
1360: if ((b = sshbuf_new()) == NULL)
1361: return SSH_ERR_ALLOC_FAIL;
1362: switch (key->type) {
1363: #ifdef WITH_SSH1
1364: case KEY_RSA1:
1365: if (key->rsa == NULL || key->rsa->e == NULL ||
1366: key->rsa->n == NULL) {
1367: ret = SSH_ERR_INVALID_ARGUMENT;
1368: goto out;
1369: }
1370: if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1371: (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1372: ret = SSH_ERR_ALLOC_FAIL;
1373: goto out;
1374: }
1375: /* size of modulus 'n' */
1376: if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1377: ret = SSH_ERR_INVALID_ARGUMENT;
1378: goto out;
1379: }
1380: if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1381: goto out;
1382: #endif /* WITH_SSH1 */
1383: break;
1384: #ifdef WITH_OPENSSL
1385: case KEY_DSA:
1386: case KEY_DSA_CERT_V00:
1387: case KEY_DSA_CERT:
1388: case KEY_ECDSA:
1389: case KEY_ECDSA_CERT:
1390: case KEY_RSA:
1391: case KEY_RSA_CERT_V00:
1392: case KEY_RSA_CERT:
1393: #endif /* WITH_OPENSSL */
1394: case KEY_ED25519:
1395: case KEY_ED25519_CERT:
1396: if ((bb = sshbuf_new()) == NULL) {
1397: ret = SSH_ERR_ALLOC_FAIL;
1398: goto out;
1399: }
1400: if ((ret = sshkey_to_blob_buf(key, bb)) != 0)
1401: goto out;
1402: if ((uu = sshbuf_dtob64(bb)) == NULL) {
1403: ret = SSH_ERR_ALLOC_FAIL;
1404: goto out;
1405: }
1406: if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
1407: goto out;
1408: if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
1409: goto out;
1410: break;
1411: default:
1412: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1413: goto out;
1414: }
1415: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1416: if (feof(f))
1417: errno = EPIPE;
1418: ret = SSH_ERR_SYSTEM_ERROR;
1419: goto out;
1420: }
1421: ret = 0;
1422: out:
1423: if (b != NULL)
1424: sshbuf_free(b);
1425: if (bb != NULL)
1426: sshbuf_free(bb);
1427: if (uu != NULL)
1428: free(uu);
1429: #ifdef WITH_SSH1
1430: if (dec_e != NULL)
1431: OPENSSL_free(dec_e);
1432: if (dec_n != NULL)
1433: OPENSSL_free(dec_n);
1434: #endif /* WITH_SSH1 */
1435: return ret;
1436: }
1437:
1438: const char *
1439: sshkey_cert_type(const struct sshkey *k)
1440: {
1441: switch (k->cert->type) {
1442: case SSH2_CERT_TYPE_USER:
1443: return "user";
1444: case SSH2_CERT_TYPE_HOST:
1445: return "host";
1446: default:
1447: return "unknown";
1448: }
1449: }
1450:
1451: #ifdef WITH_OPENSSL
1452: static int
1453: rsa_generate_private_key(u_int bits, RSA **rsap)
1454: {
1455: RSA *private = NULL;
1456: BIGNUM *f4 = NULL;
1457: int ret = SSH_ERR_INTERNAL_ERROR;
1458:
1459: if (rsap == NULL ||
1460: bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1461: bits > SSHBUF_MAX_BIGNUM * 8)
1462: return SSH_ERR_INVALID_ARGUMENT;
1463: *rsap = NULL;
1464: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1465: ret = SSH_ERR_ALLOC_FAIL;
1466: goto out;
1467: }
1468: if (!BN_set_word(f4, RSA_F4) ||
1469: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1470: ret = SSH_ERR_LIBCRYPTO_ERROR;
1471: goto out;
1472: }
1473: *rsap = private;
1474: private = NULL;
1475: ret = 0;
1476: out:
1477: if (private != NULL)
1478: RSA_free(private);
1479: if (f4 != NULL)
1480: BN_free(f4);
1481: return ret;
1482: }
1483:
1484: static int
1485: dsa_generate_private_key(u_int bits, DSA **dsap)
1486: {
1487: DSA *private;
1488: int ret = SSH_ERR_INTERNAL_ERROR;
1489:
1490: if (dsap == NULL || bits != 1024)
1491: return SSH_ERR_INVALID_ARGUMENT;
1492: if ((private = DSA_new()) == NULL) {
1493: ret = SSH_ERR_ALLOC_FAIL;
1494: goto out;
1495: }
1496: *dsap = NULL;
1497: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1498: NULL, NULL) || !DSA_generate_key(private)) {
1499: DSA_free(private);
1500: ret = SSH_ERR_LIBCRYPTO_ERROR;
1501: goto out;
1502: }
1503: *dsap = private;
1504: private = NULL;
1505: ret = 0;
1506: out:
1507: if (private != NULL)
1508: DSA_free(private);
1509: return ret;
1510: }
1511:
1512: int
1513: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1514: {
1515: EC_GROUP *eg;
1516: int nids[] = {
1517: NID_X9_62_prime256v1,
1518: NID_secp384r1,
1519: NID_secp521r1,
1520: -1
1521: };
1522: int nid;
1523: u_int i;
1524: BN_CTX *bnctx;
1525: const EC_GROUP *g = EC_KEY_get0_group(k);
1526:
1527: /*
1528: * The group may be stored in a ASN.1 encoded private key in one of two
1529: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1530: * or explicit group parameters encoded into the key blob. Only the
1531: * "named group" case sets the group NID for us, but we can figure
1532: * it out for the other case by comparing against all the groups that
1533: * are supported.
1534: */
1535: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1536: return nid;
1537: if ((bnctx = BN_CTX_new()) == NULL)
1538: return -1;
1539: for (i = 0; nids[i] != -1; i++) {
1540: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1541: BN_CTX_free(bnctx);
1542: return -1;
1543: }
1544: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1545: break;
1546: EC_GROUP_free(eg);
1547: }
1548: BN_CTX_free(bnctx);
1549: if (nids[i] != -1) {
1550: /* Use the group with the NID attached */
1551: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1552: if (EC_KEY_set_group(k, eg) != 1) {
1553: EC_GROUP_free(eg);
1554: return -1;
1555: }
1556: }
1557: return nids[i];
1558: }
1559:
1560: static int
1561: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1562: {
1563: EC_KEY *private;
1564: int ret = SSH_ERR_INTERNAL_ERROR;
1565:
1566: if (nid == NULL || ecdsap == NULL ||
1567: (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1568: return SSH_ERR_INVALID_ARGUMENT;
1569: *ecdsap = NULL;
1570: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1571: ret = SSH_ERR_ALLOC_FAIL;
1572: goto out;
1573: }
1574: if (EC_KEY_generate_key(private) != 1) {
1575: ret = SSH_ERR_LIBCRYPTO_ERROR;
1576: goto out;
1577: }
1578: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1579: *ecdsap = private;
1580: private = NULL;
1581: ret = 0;
1582: out:
1583: if (private != NULL)
1584: EC_KEY_free(private);
1585: return ret;
1586: }
1587: #endif /* WITH_OPENSSL */
1588:
1589: int
1590: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1591: {
1592: struct sshkey *k;
1593: int ret = SSH_ERR_INTERNAL_ERROR;
1594:
1595: if (keyp == NULL)
1596: return SSH_ERR_INVALID_ARGUMENT;
1597: *keyp = NULL;
1598: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1599: return SSH_ERR_ALLOC_FAIL;
1600: switch (type) {
1601: case KEY_ED25519:
1602: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1603: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1604: ret = SSH_ERR_ALLOC_FAIL;
1605: break;
1606: }
1607: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1608: ret = 0;
1609: break;
1610: #ifdef WITH_OPENSSL
1611: case KEY_DSA:
1612: ret = dsa_generate_private_key(bits, &k->dsa);
1613: break;
1614: case KEY_ECDSA:
1615: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1616: &k->ecdsa);
1617: break;
1618: case KEY_RSA:
1619: case KEY_RSA1:
1620: ret = rsa_generate_private_key(bits, &k->rsa);
1621: break;
1622: #endif /* WITH_OPENSSL */
1623: default:
1624: ret = SSH_ERR_INVALID_ARGUMENT;
1625: }
1626: if (ret == 0) {
1627: k->type = type;
1628: *keyp = k;
1629: } else
1630: sshkey_free(k);
1631: return ret;
1632: }
1633:
1634: int
1635: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1636: {
1637: u_int i;
1638: const struct sshkey_cert *from;
1639: struct sshkey_cert *to;
1640: int ret = SSH_ERR_INTERNAL_ERROR;
1641:
1642: if (to_key->cert != NULL) {
1643: cert_free(to_key->cert);
1644: to_key->cert = NULL;
1645: }
1646:
1647: if ((from = from_key->cert) == NULL)
1648: return SSH_ERR_INVALID_ARGUMENT;
1649:
1650: if ((to = to_key->cert = cert_new()) == NULL)
1651: return SSH_ERR_ALLOC_FAIL;
1652:
1653: if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1654: (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1655: (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1656: return ret;
1657:
1658: to->serial = from->serial;
1659: to->type = from->type;
1660: if (from->key_id == NULL)
1661: to->key_id = NULL;
1662: else if ((to->key_id = strdup(from->key_id)) == NULL)
1663: return SSH_ERR_ALLOC_FAIL;
1664: to->valid_after = from->valid_after;
1665: to->valid_before = from->valid_before;
1666: if (from->signature_key == NULL)
1667: to->signature_key = NULL;
1668: else if ((ret = sshkey_from_private(from->signature_key,
1669: &to->signature_key)) != 0)
1670: return ret;
1671:
1672: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1673: return SSH_ERR_INVALID_ARGUMENT;
1674: if (from->nprincipals > 0) {
1675: if ((to->principals = calloc(from->nprincipals,
1676: sizeof(*to->principals))) == NULL)
1677: return SSH_ERR_ALLOC_FAIL;
1678: for (i = 0; i < from->nprincipals; i++) {
1679: to->principals[i] = strdup(from->principals[i]);
1680: if (to->principals[i] == NULL) {
1681: to->nprincipals = i;
1682: return SSH_ERR_ALLOC_FAIL;
1683: }
1684: }
1685: }
1686: to->nprincipals = from->nprincipals;
1687: return 0;
1688: }
1689:
1690: int
1691: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1692: {
1693: struct sshkey *n = NULL;
1694: int ret = SSH_ERR_INTERNAL_ERROR;
1695:
1696: if (pkp != NULL)
1697: *pkp = NULL;
1698:
1699: switch (k->type) {
1700: #ifdef WITH_OPENSSL
1701: case KEY_DSA:
1702: case KEY_DSA_CERT_V00:
1703: case KEY_DSA_CERT:
1704: if ((n = sshkey_new(k->type)) == NULL)
1705: return SSH_ERR_ALLOC_FAIL;
1706: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1707: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1708: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1709: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1710: sshkey_free(n);
1711: return SSH_ERR_ALLOC_FAIL;
1712: }
1713: break;
1714: case KEY_ECDSA:
1715: case KEY_ECDSA_CERT:
1716: if ((n = sshkey_new(k->type)) == NULL)
1717: return SSH_ERR_ALLOC_FAIL;
1718: n->ecdsa_nid = k->ecdsa_nid;
1719: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1720: if (n->ecdsa == NULL) {
1721: sshkey_free(n);
1722: return SSH_ERR_ALLOC_FAIL;
1723: }
1724: if (EC_KEY_set_public_key(n->ecdsa,
1725: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1726: sshkey_free(n);
1727: return SSH_ERR_LIBCRYPTO_ERROR;
1728: }
1729: break;
1730: case KEY_RSA:
1731: case KEY_RSA1:
1732: case KEY_RSA_CERT_V00:
1733: case KEY_RSA_CERT:
1734: if ((n = sshkey_new(k->type)) == NULL)
1735: return SSH_ERR_ALLOC_FAIL;
1736: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1737: (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1738: sshkey_free(n);
1739: return SSH_ERR_ALLOC_FAIL;
1740: }
1741: break;
1742: #endif /* WITH_OPENSSL */
1743: case KEY_ED25519:
1744: case KEY_ED25519_CERT:
1745: if ((n = sshkey_new(k->type)) == NULL)
1746: return SSH_ERR_ALLOC_FAIL;
1747: if (k->ed25519_pk != NULL) {
1748: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1749: sshkey_free(n);
1750: return SSH_ERR_ALLOC_FAIL;
1751: }
1752: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1753: }
1754: break;
1755: default:
1756: return SSH_ERR_KEY_TYPE_UNKNOWN;
1757: }
1758: if (sshkey_is_cert(k)) {
1759: if ((ret = sshkey_cert_copy(k, n)) != 0) {
1760: sshkey_free(n);
1761: return ret;
1762: }
1763: }
1764: *pkp = n;
1765: return 0;
1766: }
1767:
1768: static int
1769: cert_parse(struct sshbuf *b, struct sshkey *key, const u_char *blob,
1770: size_t blen)
1771: {
1.4 djm 1772: struct sshbuf *principals = NULL, *crit = NULL, *exts = NULL;
1.1 djm 1773: u_char *sig_key = NULL, *sig = NULL;
1.4 djm 1774: size_t signed_len = 0, sklen = 0, slen = 0, kidlen = 0;
1.1 djm 1775: int ret = SSH_ERR_INTERNAL_ERROR;
1776: int v00 = sshkey_cert_is_legacy(key);
1777:
1778: /* Copy the entire key blob for verification and later serialisation */
1779: if ((ret = sshbuf_put(key->cert->certblob, blob, blen)) != 0)
1780: return ret;
1781:
1782: if ((!v00 && (ret = sshbuf_get_u64(b, &key->cert->serial)) != 0) ||
1783: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1784: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1785: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1786: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1787: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1788: (ret = sshbuf_froms(b, &crit)) != 0 ||
1789: (!v00 && (ret = sshbuf_froms(b, &exts)) != 0) ||
1.1 djm 1790: (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
1791: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1792: (ret = sshbuf_get_string(b, &sig_key, &sklen)) != 0) {
1793: /* XXX debug print error for ret */
1794: ret = SSH_ERR_INVALID_FORMAT;
1795: goto out;
1796: }
1797:
1798: /* Signature is left in the buffer so we can calculate this length */
1799: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1800:
1801: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1802: ret = SSH_ERR_INVALID_FORMAT;
1803: goto out;
1804: }
1805:
1806: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1807: key->cert->type != SSH2_CERT_TYPE_HOST) {
1808: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1809: goto out;
1810: }
1811:
1.4 djm 1812: /* Parse principals section */
1813: while (sshbuf_len(principals) > 0) {
1814: char *principal = NULL;
1815: char **oprincipals = NULL;
1816:
1.1 djm 1817: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1818: ret = SSH_ERR_INVALID_FORMAT;
1819: goto out;
1820: }
1.4 djm 1821: if ((ret = sshbuf_get_cstring(principals, &principal,
1822: NULL)) != 0) {
1.1 djm 1823: ret = SSH_ERR_INVALID_FORMAT;
1824: goto out;
1825: }
1826: oprincipals = key->cert->principals;
1827: key->cert->principals = realloc(key->cert->principals,
1828: (key->cert->nprincipals + 1) *
1829: sizeof(*key->cert->principals));
1830: if (key->cert->principals == NULL) {
1831: free(principal);
1832: key->cert->principals = oprincipals;
1833: ret = SSH_ERR_ALLOC_FAIL;
1834: goto out;
1835: }
1836: key->cert->principals[key->cert->nprincipals++] = principal;
1837: }
1838:
1.4 djm 1839: /*
1840: * Stash a copies of the critical options and extensions sections
1841: * for later use.
1842: */
1843: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1844: (exts != NULL &&
1845: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1846: goto out;
1847:
1.4 djm 1848: /*
1849: * Validate critical options and extensions sections format.
1850: * NB. extensions are not present in v00 certs.
1851: */
1852: while (sshbuf_len(crit) != 0) {
1853: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1854: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1855: sshbuf_reset(key->cert->critical);
1.1 djm 1856: ret = SSH_ERR_INVALID_FORMAT;
1857: goto out;
1858: }
1859: }
1.4 djm 1860: while (exts != NULL && sshbuf_len(exts) != 0) {
1861: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1862: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1863: sshbuf_reset(key->cert->extensions);
1.1 djm 1864: ret = SSH_ERR_INVALID_FORMAT;
1865: goto out;
1866: }
1867: }
1868:
1.4 djm 1869: /* Parse CA key and check signature */
1.1 djm 1870: if (sshkey_from_blob_internal(sig_key, sklen,
1871: &key->cert->signature_key, 0) != 0) {
1872: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1873: goto out;
1874: }
1875: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1876: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1877: goto out;
1878: }
1879: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1880: sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1881: goto out;
1.4 djm 1882:
1883: /* Success */
1.1 djm 1884: ret = 0;
1885: out:
1.4 djm 1886: sshbuf_free(crit);
1887: sshbuf_free(exts);
1888: sshbuf_free(principals);
1.1 djm 1889: free(sig_key);
1890: free(sig);
1891: return ret;
1892: }
1893:
1894: static int
1895: sshkey_from_blob_internal(const u_char *blob, size_t blen,
1896: struct sshkey **keyp, int allow_cert)
1897: {
1898: struct sshbuf *b = NULL;
1899: int type, nid = -1, ret = SSH_ERR_INTERNAL_ERROR;
1900: char *ktype = NULL, *curve = NULL;
1901: struct sshkey *key = NULL;
1902: size_t len;
1903: u_char *pk = NULL;
1904: #ifdef WITH_OPENSSL
1905: EC_POINT *q = NULL;
1906: #endif /* WITH_OPENSSL */
1907:
1908: #ifdef DEBUG_PK /* XXX */
1909: dump_base64(stderr, blob, blen);
1910: #endif
1911: *keyp = NULL;
1912: if ((b = sshbuf_from(blob, blen)) == NULL)
1913: return SSH_ERR_ALLOC_FAIL;
1914: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1915: ret = SSH_ERR_INVALID_FORMAT;
1916: goto out;
1917: }
1918:
1919: type = sshkey_type_from_name(ktype);
1920: if (sshkey_type_plain(type) == KEY_ECDSA)
1921: nid = sshkey_ecdsa_nid_from_name(ktype);
1922: if (!allow_cert && sshkey_type_is_cert(type)) {
1923: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1924: goto out;
1925: }
1926: switch (type) {
1927: #ifdef WITH_OPENSSL
1928: case KEY_RSA_CERT:
1929: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1930: ret = SSH_ERR_INVALID_FORMAT;
1931: goto out;
1932: }
1933: /* FALLTHROUGH */
1934: case KEY_RSA:
1935: case KEY_RSA_CERT_V00:
1936: if ((key = sshkey_new(type)) == NULL) {
1937: ret = SSH_ERR_ALLOC_FAIL;
1938: goto out;
1939: }
1940: if (sshbuf_get_bignum2(b, key->rsa->e) == -1 ||
1941: sshbuf_get_bignum2(b, key->rsa->n) == -1) {
1942: ret = SSH_ERR_INVALID_FORMAT;
1943: goto out;
1944: }
1945: #ifdef DEBUG_PK
1946: RSA_print_fp(stderr, key->rsa, 8);
1947: #endif
1948: break;
1949: case KEY_DSA_CERT:
1950: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1951: ret = SSH_ERR_INVALID_FORMAT;
1952: goto out;
1953: }
1954: /* FALLTHROUGH */
1955: case KEY_DSA:
1956: case KEY_DSA_CERT_V00:
1957: if ((key = sshkey_new(type)) == NULL) {
1958: ret = SSH_ERR_ALLOC_FAIL;
1959: goto out;
1960: }
1961: if (sshbuf_get_bignum2(b, key->dsa->p) == -1 ||
1962: sshbuf_get_bignum2(b, key->dsa->q) == -1 ||
1963: sshbuf_get_bignum2(b, key->dsa->g) == -1 ||
1964: sshbuf_get_bignum2(b, key->dsa->pub_key) == -1) {
1965: ret = SSH_ERR_INVALID_FORMAT;
1966: goto out;
1967: }
1968: #ifdef DEBUG_PK
1969: DSA_print_fp(stderr, key->dsa, 8);
1970: #endif
1971: break;
1972: case KEY_ECDSA_CERT:
1973: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1974: ret = SSH_ERR_INVALID_FORMAT;
1975: goto out;
1976: }
1977: /* FALLTHROUGH */
1978: case KEY_ECDSA:
1979: if ((key = sshkey_new(type)) == NULL) {
1980: ret = SSH_ERR_ALLOC_FAIL;
1981: goto out;
1982: }
1983: key->ecdsa_nid = nid;
1984: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1985: ret = SSH_ERR_INVALID_FORMAT;
1986: goto out;
1987: }
1988: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1989: ret = SSH_ERR_EC_CURVE_MISMATCH;
1990: goto out;
1991: }
1992: if (key->ecdsa != NULL)
1993: EC_KEY_free(key->ecdsa);
1994: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1995: == NULL) {
1996: ret = SSH_ERR_EC_CURVE_INVALID;
1997: goto out;
1998: }
1999: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2000: ret = SSH_ERR_ALLOC_FAIL;
2001: goto out;
2002: }
2003: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2004: ret = SSH_ERR_INVALID_FORMAT;
2005: goto out;
2006: }
2007: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2008: q) != 0) {
2009: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2010: goto out;
2011: }
2012: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2013: /* XXX assume it is a allocation error */
2014: ret = SSH_ERR_ALLOC_FAIL;
2015: goto out;
2016: }
2017: #ifdef DEBUG_PK
2018: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2019: #endif
2020: break;
2021: #endif /* WITH_OPENSSL */
2022: case KEY_ED25519_CERT:
2023: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2024: ret = SSH_ERR_INVALID_FORMAT;
2025: goto out;
2026: }
2027: /* FALLTHROUGH */
2028: case KEY_ED25519:
2029: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2030: goto out;
2031: if (len != ED25519_PK_SZ) {
2032: ret = SSH_ERR_INVALID_FORMAT;
2033: goto out;
2034: }
2035: if ((key = sshkey_new(type)) == NULL) {
2036: ret = SSH_ERR_ALLOC_FAIL;
2037: goto out;
2038: }
2039: key->ed25519_pk = pk;
2040: pk = NULL;
2041: break;
2042: case KEY_UNSPEC:
2043: if ((key = sshkey_new(type)) == NULL) {
2044: ret = SSH_ERR_ALLOC_FAIL;
2045: goto out;
2046: }
2047: break;
2048: default:
2049: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2050: goto out;
2051: }
2052:
2053: /* Parse certificate potion */
2054: if (sshkey_is_cert(key) &&
2055: (ret = cert_parse(b, key, blob, blen)) != 0)
2056: goto out;
2057:
2058: if (key != NULL && sshbuf_len(b) != 0) {
2059: ret = SSH_ERR_INVALID_FORMAT;
2060: goto out;
2061: }
2062: ret = 0;
2063: *keyp = key;
2064: key = NULL;
2065: out:
2066: sshbuf_free(b);
2067: sshkey_free(key);
2068: free(ktype);
2069: free(curve);
2070: free(pk);
2071: #ifdef WITH_OPENSSL
2072: if (q != NULL)
2073: EC_POINT_free(q);
2074: #endif /* WITH_OPENSSL */
2075: return ret;
2076: }
2077:
2078: int
2079: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2080: {
2081: return sshkey_from_blob_internal(blob, blen, keyp, 1);
2082: }
2083:
2084: int
2085: sshkey_sign(const struct sshkey *key,
2086: u_char **sigp, size_t *lenp,
2087: const u_char *data, size_t datalen, u_int compat)
2088: {
2089: if (sigp != NULL)
2090: *sigp = NULL;
2091: if (lenp != NULL)
2092: *lenp = 0;
2093: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2094: return SSH_ERR_INVALID_ARGUMENT;
2095: switch (key->type) {
2096: #ifdef WITH_OPENSSL
2097: case KEY_DSA_CERT_V00:
2098: case KEY_DSA_CERT:
2099: case KEY_DSA:
2100: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2101: case KEY_ECDSA_CERT:
2102: case KEY_ECDSA:
2103: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2104: case KEY_RSA_CERT_V00:
2105: case KEY_RSA_CERT:
2106: case KEY_RSA:
2107: return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2108: #endif /* WITH_OPENSSL */
2109: case KEY_ED25519:
2110: case KEY_ED25519_CERT:
2111: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2112: default:
2113: return SSH_ERR_KEY_TYPE_UNKNOWN;
2114: }
2115: }
2116:
2117: /*
2118: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2119: */
2120: int
2121: sshkey_verify(const struct sshkey *key,
2122: const u_char *sig, size_t siglen,
2123: const u_char *data, size_t dlen, u_int compat)
2124: {
1.6 djm 2125: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2126: return SSH_ERR_INVALID_ARGUMENT;
2127: switch (key->type) {
2128: #ifdef WITH_OPENSSL
2129: case KEY_DSA_CERT_V00:
2130: case KEY_DSA_CERT:
2131: case KEY_DSA:
2132: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2133: case KEY_ECDSA_CERT:
2134: case KEY_ECDSA:
2135: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2136: case KEY_RSA_CERT_V00:
2137: case KEY_RSA_CERT:
2138: case KEY_RSA:
2139: return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2140: #endif /* WITH_OPENSSL */
2141: case KEY_ED25519:
2142: case KEY_ED25519_CERT:
2143: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2144: default:
2145: return SSH_ERR_KEY_TYPE_UNKNOWN;
2146: }
2147: }
2148:
2149: /* Converts a private to a public key */
2150: int
2151: sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2152: {
2153: struct sshkey *pk;
2154: int ret = SSH_ERR_INTERNAL_ERROR;
2155:
2156: if (dkp != NULL)
2157: *dkp = NULL;
2158:
2159: if ((pk = calloc(1, sizeof(*pk))) == NULL)
2160: return SSH_ERR_ALLOC_FAIL;
2161: pk->type = k->type;
2162: pk->flags = k->flags;
2163: pk->ecdsa_nid = k->ecdsa_nid;
2164: pk->dsa = NULL;
2165: pk->ecdsa = NULL;
2166: pk->rsa = NULL;
2167: pk->ed25519_pk = NULL;
2168: pk->ed25519_sk = NULL;
2169:
2170: switch (k->type) {
2171: #ifdef WITH_OPENSSL
2172: case KEY_RSA_CERT_V00:
2173: case KEY_RSA_CERT:
2174: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2175: goto fail;
2176: /* FALLTHROUGH */
2177: case KEY_RSA1:
2178: case KEY_RSA:
2179: if ((pk->rsa = RSA_new()) == NULL ||
2180: (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2181: (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2182: ret = SSH_ERR_ALLOC_FAIL;
2183: goto fail;
2184: }
2185: break;
2186: case KEY_DSA_CERT_V00:
2187: case KEY_DSA_CERT:
2188: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2189: goto fail;
2190: /* FALLTHROUGH */
2191: case KEY_DSA:
2192: if ((pk->dsa = DSA_new()) == NULL ||
2193: (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2194: (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2195: (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2196: (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2197: ret = SSH_ERR_ALLOC_FAIL;
2198: goto fail;
2199: }
2200: break;
2201: case KEY_ECDSA_CERT:
2202: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2203: goto fail;
2204: /* FALLTHROUGH */
2205: case KEY_ECDSA:
2206: pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2207: if (pk->ecdsa == NULL) {
2208: ret = SSH_ERR_ALLOC_FAIL;
2209: goto fail;
2210: }
2211: if (EC_KEY_set_public_key(pk->ecdsa,
2212: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2213: ret = SSH_ERR_LIBCRYPTO_ERROR;
2214: goto fail;
2215: }
2216: break;
2217: #endif /* WITH_OPENSSL */
2218: case KEY_ED25519_CERT:
2219: if ((ret = sshkey_cert_copy(k, pk)) != 0)
2220: goto fail;
2221: /* FALLTHROUGH */
2222: case KEY_ED25519:
2223: if (k->ed25519_pk != NULL) {
2224: if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2225: ret = SSH_ERR_ALLOC_FAIL;
2226: goto fail;
2227: }
2228: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2229: }
2230: break;
2231: default:
2232: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2233: fail:
2234: sshkey_free(pk);
2235: return ret;
2236: }
2237: *dkp = pk;
2238: return 0;
2239: }
2240:
2241: /* Convert a plain key to their _CERT equivalent */
2242: int
2243: sshkey_to_certified(struct sshkey *k, int legacy)
2244: {
2245: int newtype;
2246:
2247: switch (k->type) {
2248: #ifdef WITH_OPENSSL
2249: case KEY_RSA:
2250: newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
2251: break;
2252: case KEY_DSA:
2253: newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
2254: break;
2255: case KEY_ECDSA:
2256: if (legacy)
2257: return SSH_ERR_INVALID_ARGUMENT;
2258: newtype = KEY_ECDSA_CERT;
2259: break;
2260: #endif /* WITH_OPENSSL */
2261: case KEY_ED25519:
2262: if (legacy)
2263: return SSH_ERR_INVALID_ARGUMENT;
2264: newtype = KEY_ED25519_CERT;
2265: break;
2266: default:
2267: return SSH_ERR_INVALID_ARGUMENT;
2268: }
2269: if ((k->cert = cert_new()) == NULL)
2270: return SSH_ERR_ALLOC_FAIL;
2271: k->type = newtype;
2272: return 0;
2273: }
2274:
2275: /* Convert a certificate to its raw key equivalent */
2276: int
2277: sshkey_drop_cert(struct sshkey *k)
2278: {
2279: if (!sshkey_type_is_cert(k->type))
2280: return SSH_ERR_KEY_TYPE_UNKNOWN;
2281: cert_free(k->cert);
2282: k->cert = NULL;
2283: k->type = sshkey_type_plain(k->type);
2284: return 0;
2285: }
2286:
2287: /* Sign a certified key, (re-)generating the signed certblob. */
2288: int
2289: sshkey_certify(struct sshkey *k, struct sshkey *ca)
2290: {
2291: struct sshbuf *principals = NULL;
2292: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2293: size_t i, ca_len, sig_len;
2294: int ret = SSH_ERR_INTERNAL_ERROR;
2295: struct sshbuf *cert;
2296:
2297: if (k == NULL || k->cert == NULL ||
2298: k->cert->certblob == NULL || ca == NULL)
2299: return SSH_ERR_INVALID_ARGUMENT;
2300: if (!sshkey_is_cert(k))
2301: return SSH_ERR_KEY_TYPE_UNKNOWN;
2302: if (!sshkey_type_is_valid_ca(ca->type))
2303: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2304:
2305: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2306: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2307:
2308: cert = k->cert->certblob; /* for readability */
2309: sshbuf_reset(cert);
2310: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2311: goto out;
2312:
2313: /* -v01 certs put nonce first */
2314: arc4random_buf(&nonce, sizeof(nonce));
2315: if (!sshkey_cert_is_legacy(k)) {
2316: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2317: goto out;
2318: }
2319:
2320: /* XXX this substantially duplicates to_blob(); refactor */
2321: switch (k->type) {
2322: #ifdef WITH_OPENSSL
2323: case KEY_DSA_CERT_V00:
2324: case KEY_DSA_CERT:
2325: if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2326: (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2327: (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2328: (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2329: goto out;
2330: break;
2331: case KEY_ECDSA_CERT:
2332: if ((ret = sshbuf_put_cstring(cert,
2333: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2334: (ret = sshbuf_put_ec(cert,
2335: EC_KEY_get0_public_key(k->ecdsa),
2336: EC_KEY_get0_group(k->ecdsa))) != 0)
2337: goto out;
2338: break;
2339: case KEY_RSA_CERT_V00:
2340: case KEY_RSA_CERT:
2341: if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2342: (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2343: goto out;
2344: break;
2345: #endif /* WITH_OPENSSL */
2346: case KEY_ED25519_CERT:
2347: if ((ret = sshbuf_put_string(cert,
2348: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2349: goto out;
2350: break;
2351: default:
2352: ret = SSH_ERR_INVALID_ARGUMENT;
2353: }
2354:
2355: /* -v01 certs have a serial number next */
2356: if (!sshkey_cert_is_legacy(k)) {
2357: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
2358: goto out;
2359: }
2360:
2361: if ((ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2362: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2363: goto out;
2364:
2365: if ((principals = sshbuf_new()) == NULL) {
2366: ret = SSH_ERR_ALLOC_FAIL;
2367: goto out;
2368: }
2369: for (i = 0; i < k->cert->nprincipals; i++) {
2370: if ((ret = sshbuf_put_cstring(principals,
2371: k->cert->principals[i])) != 0)
2372: goto out;
2373: }
2374: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2375: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2376: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2377: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0)
2378: goto out;
2379:
2380: /* -v01 certs have non-critical options here */
2381: if (!sshkey_cert_is_legacy(k)) {
2382: if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
2383: goto out;
2384: }
2385:
2386: /* -v00 certs put the nonce at the end */
2387: if (sshkey_cert_is_legacy(k)) {
2388: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2389: goto out;
2390: }
2391:
2392: if ((ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2393: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2394: goto out;
2395:
2396: /* Sign the whole mess */
2397: if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2398: sshbuf_len(cert), 0)) != 0)
2399: goto out;
2400:
2401: /* Append signature and we are done */
2402: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2403: goto out;
2404: ret = 0;
2405: out:
2406: if (ret != 0)
2407: sshbuf_reset(cert);
2408: if (sig_blob != NULL)
2409: free(sig_blob);
2410: if (ca_blob != NULL)
2411: free(ca_blob);
2412: if (principals != NULL)
2413: sshbuf_free(principals);
2414: return ret;
2415: }
2416:
2417: int
2418: sshkey_cert_check_authority(const struct sshkey *k,
2419: int want_host, int require_principal,
2420: const char *name, const char **reason)
2421: {
2422: u_int i, principal_matches;
2423: time_t now = time(NULL);
2424:
2425: if (reason != NULL)
2426: *reason = NULL;
2427:
2428: if (want_host) {
2429: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2430: *reason = "Certificate invalid: not a host certificate";
2431: return SSH_ERR_KEY_CERT_INVALID;
2432: }
2433: } else {
2434: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2435: *reason = "Certificate invalid: not a user certificate";
2436: return SSH_ERR_KEY_CERT_INVALID;
2437: }
2438: }
2439: if (now < 0) {
2440: /* yikes - system clock before epoch! */
2441: *reason = "Certificate invalid: not yet valid";
2442: return SSH_ERR_KEY_CERT_INVALID;
2443: }
2444: if ((u_int64_t)now < k->cert->valid_after) {
2445: *reason = "Certificate invalid: not yet valid";
2446: return SSH_ERR_KEY_CERT_INVALID;
2447: }
2448: if ((u_int64_t)now >= k->cert->valid_before) {
2449: *reason = "Certificate invalid: expired";
2450: return SSH_ERR_KEY_CERT_INVALID;
2451: }
2452: if (k->cert->nprincipals == 0) {
2453: if (require_principal) {
2454: *reason = "Certificate lacks principal list";
2455: return SSH_ERR_KEY_CERT_INVALID;
2456: }
2457: } else if (name != NULL) {
2458: principal_matches = 0;
2459: for (i = 0; i < k->cert->nprincipals; i++) {
2460: if (strcmp(name, k->cert->principals[i]) == 0) {
2461: principal_matches = 1;
2462: break;
2463: }
2464: }
2465: if (!principal_matches) {
2466: *reason = "Certificate invalid: name is not a listed "
2467: "principal";
2468: return SSH_ERR_KEY_CERT_INVALID;
2469: }
2470: }
2471: return 0;
2472: }
2473:
2474: int
2475: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2476: {
2477: int r = SSH_ERR_INTERNAL_ERROR;
2478:
2479: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2480: goto out;
2481: switch (key->type) {
2482: #ifdef WITH_OPENSSL
2483: case KEY_RSA:
2484: if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2485: (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2486: (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2487: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2488: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2489: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2490: goto out;
2491: break;
2492: case KEY_RSA_CERT_V00:
2493: case KEY_RSA_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, key->rsa->d)) != 0 ||
2500: (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2501: (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2502: (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2503: goto out;
2504: break;
2505: case KEY_DSA:
2506: if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2507: (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2508: (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2509: (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2510: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2511: goto out;
2512: break;
2513: case KEY_DSA_CERT_V00:
2514: case KEY_DSA_CERT:
2515: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2516: r = SSH_ERR_INVALID_ARGUMENT;
2517: goto out;
2518: }
2519: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2520: (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2521: goto out;
2522: break;
2523: case KEY_ECDSA:
2524: if ((r = sshbuf_put_cstring(b,
2525: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2526: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2527: (r = sshbuf_put_bignum2(b,
2528: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2529: goto out;
2530: break;
2531: case KEY_ECDSA_CERT:
2532: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2533: r = SSH_ERR_INVALID_ARGUMENT;
2534: goto out;
2535: }
2536: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2537: (r = sshbuf_put_bignum2(b,
2538: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2539: goto out;
2540: break;
2541: #endif /* WITH_OPENSSL */
2542: case KEY_ED25519:
2543: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2544: ED25519_PK_SZ)) != 0 ||
2545: (r = sshbuf_put_string(b, key->ed25519_sk,
2546: ED25519_SK_SZ)) != 0)
2547: goto out;
2548: break;
2549: case KEY_ED25519_CERT:
2550: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2551: r = SSH_ERR_INVALID_ARGUMENT;
2552: goto out;
2553: }
2554: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2555: (r = sshbuf_put_string(b, key->ed25519_pk,
2556: ED25519_PK_SZ)) != 0 ||
2557: (r = sshbuf_put_string(b, key->ed25519_sk,
2558: ED25519_SK_SZ)) != 0)
2559: goto out;
2560: break;
2561: default:
2562: r = SSH_ERR_INVALID_ARGUMENT;
2563: goto out;
2564: }
2565: /* success */
2566: r = 0;
2567: out:
2568: return r;
2569: }
2570:
2571: int
2572: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2573: {
2574: char *tname = NULL, *curve = NULL;
2575: struct sshkey *k = NULL;
2576: const u_char *cert;
2577: size_t len, pklen = 0, sklen = 0;
2578: int type, r = SSH_ERR_INTERNAL_ERROR;
2579: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2580: #ifdef WITH_OPENSSL
2581: BIGNUM *exponent = NULL;
2582: #endif /* WITH_OPENSSL */
2583:
2584: if (kp != NULL)
2585: *kp = NULL;
2586: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2587: goto out;
2588: type = sshkey_type_from_name(tname);
2589: switch (type) {
2590: #ifdef WITH_OPENSSL
2591: case KEY_DSA:
2592: if ((k = sshkey_new_private(type)) == NULL) {
2593: r = SSH_ERR_ALLOC_FAIL;
2594: goto out;
2595: }
2596: if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2597: (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2598: (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2599: (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2600: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2601: goto out;
2602: break;
2603: case KEY_DSA_CERT_V00:
2604: case KEY_DSA_CERT:
2605: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2606: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2607: (r = sshkey_add_private(k)) != 0 ||
2608: (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2609: goto out;
2610: break;
2611: case KEY_ECDSA:
2612: if ((k = sshkey_new_private(type)) == NULL) {
2613: r = SSH_ERR_ALLOC_FAIL;
2614: goto out;
2615: }
2616: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2617: r = SSH_ERR_INVALID_ARGUMENT;
2618: goto out;
2619: }
2620: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2621: goto out;
2622: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2623: r = SSH_ERR_EC_CURVE_MISMATCH;
2624: goto out;
2625: }
2626: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2627: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2628: r = SSH_ERR_LIBCRYPTO_ERROR;
2629: goto out;
2630: }
2631: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2632: (r = sshbuf_get_bignum2(buf, exponent)))
2633: goto out;
2634: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2635: r = SSH_ERR_LIBCRYPTO_ERROR;
2636: goto out;
2637: }
2638: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2639: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2640: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2641: goto out;
2642: break;
2643: case KEY_ECDSA_CERT:
2644: if ((exponent = BN_new()) == NULL) {
2645: r = SSH_ERR_LIBCRYPTO_ERROR;
2646: goto out;
2647: }
2648: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2649: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2650: (r = sshkey_add_private(k)) != 0 ||
2651: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2652: goto out;
2653: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2654: r = SSH_ERR_LIBCRYPTO_ERROR;
2655: goto out;
2656: }
2657: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2658: EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2659: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2660: goto out;
2661: break;
2662: case KEY_RSA:
2663: if ((k = sshkey_new_private(type)) == NULL) {
2664: r = SSH_ERR_ALLOC_FAIL;
2665: goto out;
2666: }
2667: if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2668: (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2669: (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2670: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2671: (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2672: (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2673: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2674: goto out;
2675: break;
2676: case KEY_RSA_CERT_V00:
2677: case KEY_RSA_CERT:
2678: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2679: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2680: (r = sshkey_add_private(k)) != 0 ||
2681: (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2682: (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2683: (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2684: (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2685: (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2686: goto out;
2687: break;
2688: #endif /* WITH_OPENSSL */
2689: case KEY_ED25519:
2690: if ((k = sshkey_new_private(type)) == NULL) {
2691: r = SSH_ERR_ALLOC_FAIL;
2692: goto out;
2693: }
2694: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2695: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2696: goto out;
2697: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2698: r = SSH_ERR_INVALID_FORMAT;
2699: goto out;
2700: }
2701: k->ed25519_pk = ed25519_pk;
2702: k->ed25519_sk = ed25519_sk;
2703: ed25519_pk = ed25519_sk = NULL;
2704: break;
2705: case KEY_ED25519_CERT:
2706: if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2707: (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2708: (r = sshkey_add_private(k)) != 0 ||
2709: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2710: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2711: goto out;
2712: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2713: r = SSH_ERR_INVALID_FORMAT;
2714: goto out;
2715: }
2716: k->ed25519_pk = ed25519_pk;
2717: k->ed25519_sk = ed25519_sk;
2718: ed25519_pk = ed25519_sk = NULL;
2719: break;
2720: default:
2721: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2722: goto out;
2723: }
2724: #ifdef WITH_OPENSSL
2725: /* enable blinding */
2726: switch (k->type) {
2727: case KEY_RSA:
2728: case KEY_RSA_CERT_V00:
2729: case KEY_RSA_CERT:
2730: case KEY_RSA1:
2731: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2732: r = SSH_ERR_LIBCRYPTO_ERROR;
2733: goto out;
2734: }
2735: break;
2736: }
2737: #endif /* WITH_OPENSSL */
2738: /* success */
2739: r = 0;
2740: if (kp != NULL) {
2741: *kp = k;
2742: k = NULL;
2743: }
2744: out:
2745: free(tname);
2746: free(curve);
2747: #ifdef WITH_OPENSSL
2748: if (exponent != NULL)
2749: BN_clear_free(exponent);
2750: #endif /* WITH_OPENSSL */
2751: sshkey_free(k);
2752: if (ed25519_pk != NULL) {
2753: explicit_bzero(ed25519_pk, pklen);
2754: free(ed25519_pk);
2755: }
2756: if (ed25519_sk != NULL) {
2757: explicit_bzero(ed25519_sk, sklen);
2758: free(ed25519_sk);
2759: }
2760: return r;
2761: }
2762:
2763: #ifdef WITH_OPENSSL
2764: int
2765: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2766: {
2767: BN_CTX *bnctx;
2768: EC_POINT *nq = NULL;
2769: BIGNUM *order, *x, *y, *tmp;
2770: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2771:
2772: if ((bnctx = BN_CTX_new()) == NULL)
2773: return SSH_ERR_ALLOC_FAIL;
2774: BN_CTX_start(bnctx);
2775:
2776: /*
2777: * We shouldn't ever hit this case because bignum_get_ecpoint()
2778: * refuses to load GF2m points.
2779: */
2780: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2781: NID_X9_62_prime_field)
2782: goto out;
2783:
2784: /* Q != infinity */
2785: if (EC_POINT_is_at_infinity(group, public))
2786: goto out;
2787:
2788: if ((x = BN_CTX_get(bnctx)) == NULL ||
2789: (y = BN_CTX_get(bnctx)) == NULL ||
2790: (order = BN_CTX_get(bnctx)) == NULL ||
2791: (tmp = BN_CTX_get(bnctx)) == NULL) {
2792: ret = SSH_ERR_ALLOC_FAIL;
2793: goto out;
2794: }
2795:
2796: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2797: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2798: EC_POINT_get_affine_coordinates_GFp(group, public,
2799: x, y, bnctx) != 1) {
2800: ret = SSH_ERR_LIBCRYPTO_ERROR;
2801: goto out;
2802: }
2803: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2804: BN_num_bits(y) <= BN_num_bits(order) / 2)
2805: goto out;
2806:
2807: /* nQ == infinity (n == order of subgroup) */
2808: if ((nq = EC_POINT_new(group)) == NULL) {
2809: ret = SSH_ERR_ALLOC_FAIL;
2810: goto out;
2811: }
2812: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2813: ret = SSH_ERR_LIBCRYPTO_ERROR;
2814: goto out;
2815: }
2816: if (EC_POINT_is_at_infinity(group, nq) != 1)
2817: goto out;
2818:
2819: /* x < order - 1, y < order - 1 */
2820: if (!BN_sub(tmp, order, BN_value_one())) {
2821: ret = SSH_ERR_LIBCRYPTO_ERROR;
2822: goto out;
2823: }
2824: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2825: goto out;
2826: ret = 0;
2827: out:
2828: BN_CTX_free(bnctx);
2829: if (nq != NULL)
2830: EC_POINT_free(nq);
2831: return ret;
2832: }
2833:
2834: int
2835: sshkey_ec_validate_private(const EC_KEY *key)
2836: {
2837: BN_CTX *bnctx;
2838: BIGNUM *order, *tmp;
2839: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2840:
2841: if ((bnctx = BN_CTX_new()) == NULL)
2842: return SSH_ERR_ALLOC_FAIL;
2843: BN_CTX_start(bnctx);
2844:
2845: if ((order = BN_CTX_get(bnctx)) == NULL ||
2846: (tmp = BN_CTX_get(bnctx)) == NULL) {
2847: ret = SSH_ERR_ALLOC_FAIL;
2848: goto out;
2849: }
2850:
2851: /* log2(private) > log2(order)/2 */
2852: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2853: ret = SSH_ERR_LIBCRYPTO_ERROR;
2854: goto out;
2855: }
2856: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2857: BN_num_bits(order) / 2)
2858: goto out;
2859:
2860: /* private < order - 1 */
2861: if (!BN_sub(tmp, order, BN_value_one())) {
2862: ret = SSH_ERR_LIBCRYPTO_ERROR;
2863: goto out;
2864: }
2865: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2866: goto out;
2867: ret = 0;
2868: out:
2869: BN_CTX_free(bnctx);
2870: return ret;
2871: }
2872:
2873: void
2874: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2875: {
2876: BIGNUM *x, *y;
2877: BN_CTX *bnctx;
2878:
2879: if (point == NULL) {
2880: fputs("point=(NULL)\n", stderr);
2881: return;
2882: }
2883: if ((bnctx = BN_CTX_new()) == NULL) {
2884: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2885: return;
2886: }
2887: BN_CTX_start(bnctx);
2888: if ((x = BN_CTX_get(bnctx)) == NULL ||
2889: (y = BN_CTX_get(bnctx)) == NULL) {
2890: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2891: return;
2892: }
2893: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2894: NID_X9_62_prime_field) {
2895: fprintf(stderr, "%s: group is not a prime field\n", __func__);
2896: return;
2897: }
2898: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2899: bnctx) != 1) {
2900: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2901: __func__);
2902: return;
2903: }
2904: fputs("x=", stderr);
2905: BN_print_fp(stderr, x);
2906: fputs("\ny=", stderr);
2907: BN_print_fp(stderr, y);
2908: fputs("\n", stderr);
2909: BN_CTX_free(bnctx);
2910: }
2911:
2912: void
2913: sshkey_dump_ec_key(const EC_KEY *key)
2914: {
2915: const BIGNUM *exponent;
2916:
2917: sshkey_dump_ec_point(EC_KEY_get0_group(key),
2918: EC_KEY_get0_public_key(key));
2919: fputs("exponent=", stderr);
2920: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2921: fputs("(NULL)", stderr);
2922: else
2923: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2924: fputs("\n", stderr);
2925: }
2926: #endif /* WITH_OPENSSL */
2927:
2928: static int
2929: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2930: const char *passphrase, const char *comment, const char *ciphername,
2931: int rounds)
2932: {
1.4 djm 2933: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 2934: u_char salt[SALT_LEN];
1.4 djm 2935: char *b64 = NULL;
1.1 djm 2936: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2937: u_int check;
2938: int r = SSH_ERR_INTERNAL_ERROR;
2939: struct sshcipher_ctx ciphercontext;
2940: const struct sshcipher *cipher;
2941: const char *kdfname = KDFNAME;
2942: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2943:
2944: memset(&ciphercontext, 0, sizeof(ciphercontext));
2945:
2946: if (rounds <= 0)
2947: rounds = DEFAULT_ROUNDS;
2948: if (passphrase == NULL || !strlen(passphrase)) {
2949: ciphername = "none";
2950: kdfname = "none";
2951: } else if (ciphername == NULL)
2952: ciphername = DEFAULT_CIPHERNAME;
2953: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2954: r = SSH_ERR_INVALID_ARGUMENT;
2955: goto out;
2956: }
2957: if ((cipher = cipher_by_name(ciphername)) == NULL) {
2958: r = SSH_ERR_INTERNAL_ERROR;
2959: goto out;
2960: }
2961:
2962: if ((kdf = sshbuf_new()) == NULL ||
2963: (encoded = sshbuf_new()) == NULL ||
2964: (encrypted = sshbuf_new()) == NULL) {
2965: r = SSH_ERR_ALLOC_FAIL;
2966: goto out;
2967: }
2968: blocksize = cipher_blocksize(cipher);
2969: keylen = cipher_keylen(cipher);
2970: ivlen = cipher_ivlen(cipher);
2971: authlen = cipher_authlen(cipher);
2972: if ((key = calloc(1, keylen + ivlen)) == NULL) {
2973: r = SSH_ERR_ALLOC_FAIL;
2974: goto out;
2975: }
2976: if (strcmp(kdfname, "bcrypt") == 0) {
2977: arc4random_buf(salt, SALT_LEN);
2978: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2979: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
2980: r = SSH_ERR_INVALID_ARGUMENT;
2981: goto out;
2982: }
2983: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
2984: (r = sshbuf_put_u32(kdf, rounds)) != 0)
2985: goto out;
2986: } else if (strcmp(kdfname, "none") != 0) {
2987: /* Unsupported KDF type */
2988: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
2989: goto out;
2990: }
2991: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2992: key + keylen, ivlen, 1)) != 0)
2993: goto out;
2994:
2995: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
2996: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
2997: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
2998: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
2999: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3000: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3001: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3002: goto out;
3003:
3004: /* set up the buffer that will be encrypted */
3005:
3006: /* Random check bytes */
3007: check = arc4random();
3008: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3009: (r = sshbuf_put_u32(encrypted, check)) != 0)
3010: goto out;
3011:
3012: /* append private key and comment*/
3013: if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3014: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3015: goto out;
3016:
3017: /* padding */
3018: i = 0;
3019: while (sshbuf_len(encrypted) % blocksize) {
3020: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3021: goto out;
3022: }
3023:
3024: /* length in destination buffer */
3025: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3026: goto out;
3027:
3028: /* encrypt */
3029: if ((r = sshbuf_reserve(encoded,
3030: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3031: goto out;
3032: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3033: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3034: goto out;
3035:
3036: /* uuencode */
3037: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3038: r = SSH_ERR_ALLOC_FAIL;
3039: goto out;
3040: }
3041:
3042: sshbuf_reset(blob);
3043: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3044: goto out;
3045: for (i = 0; i < strlen(b64); i++) {
3046: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3047: goto out;
3048: /* insert line breaks */
3049: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3050: goto out;
3051: }
3052: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3053: goto out;
3054: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3055: goto out;
3056:
3057: /* success */
3058: r = 0;
3059:
3060: out:
3061: sshbuf_free(kdf);
3062: sshbuf_free(encoded);
3063: sshbuf_free(encrypted);
3064: cipher_cleanup(&ciphercontext);
3065: explicit_bzero(salt, sizeof(salt));
3066: if (key != NULL) {
3067: explicit_bzero(key, keylen + ivlen);
3068: free(key);
3069: }
3070: if (pubkeyblob != NULL) {
3071: explicit_bzero(pubkeyblob, pubkeylen);
3072: free(pubkeyblob);
3073: }
3074: if (b64 != NULL) {
3075: explicit_bzero(b64, strlen(b64));
3076: free(b64);
3077: }
3078: return r;
3079: }
3080:
3081: static int
3082: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3083: struct sshkey **keyp, char **commentp)
3084: {
3085: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3086: const struct sshcipher *cipher = NULL;
3087: const u_char *cp;
3088: int r = SSH_ERR_INTERNAL_ERROR;
3089: size_t encoded_len;
3090: size_t i, keylen = 0, ivlen = 0, slen = 0;
3091: struct sshbuf *encoded = NULL, *decoded = NULL;
3092: struct sshbuf *kdf = NULL, *decrypted = NULL;
3093: struct sshcipher_ctx ciphercontext;
3094: struct sshkey *k = NULL;
3095: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3096: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3097:
3098: memset(&ciphercontext, 0, sizeof(ciphercontext));
3099: if (keyp != NULL)
3100: *keyp = NULL;
3101: if (commentp != NULL)
3102: *commentp = NULL;
3103:
3104: if ((encoded = sshbuf_new()) == NULL ||
3105: (decoded = sshbuf_new()) == NULL ||
3106: (decrypted = sshbuf_new()) == NULL) {
3107: r = SSH_ERR_ALLOC_FAIL;
3108: goto out;
3109: }
3110:
3111: /* check preamble */
3112: cp = sshbuf_ptr(blob);
3113: encoded_len = sshbuf_len(blob);
3114: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3115: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3116: r = SSH_ERR_INVALID_FORMAT;
3117: goto out;
3118: }
3119: cp += MARK_BEGIN_LEN;
3120: encoded_len -= MARK_BEGIN_LEN;
3121:
3122: /* Look for end marker, removing whitespace as we go */
3123: while (encoded_len > 0) {
3124: if (*cp != '\n' && *cp != '\r') {
3125: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3126: goto out;
3127: }
3128: last = *cp;
3129: encoded_len--;
3130: cp++;
3131: if (last == '\n') {
3132: if (encoded_len >= MARK_END_LEN &&
3133: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3134: /* \0 terminate */
3135: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3136: goto out;
3137: break;
3138: }
3139: }
3140: }
3141: if (encoded_len == 0) {
3142: r = SSH_ERR_INVALID_FORMAT;
3143: goto out;
3144: }
3145:
3146: /* decode base64 */
1.4 djm 3147: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3148: goto out;
3149:
3150: /* check magic */
3151: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3152: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3153: r = SSH_ERR_INVALID_FORMAT;
3154: goto out;
3155: }
3156: /* parse public portion of key */
3157: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3158: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3159: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3160: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3161: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3162: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3163: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3164: goto out;
3165:
3166: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3167: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3168: goto out;
3169: }
3170: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3171: strcmp(ciphername, "none") != 0) {
3172: /* passphrase required */
3173: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3174: goto out;
3175: }
3176: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3177: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3178: goto out;
3179: }
3180: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3181: r = SSH_ERR_INVALID_FORMAT;
3182: goto out;
3183: }
3184: if (nkeys != 1) {
3185: /* XXX only one key supported */
3186: r = SSH_ERR_INVALID_FORMAT;
3187: goto out;
3188: }
3189:
3190: /* check size of encrypted key blob */
3191: blocksize = cipher_blocksize(cipher);
3192: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3193: r = SSH_ERR_INVALID_FORMAT;
3194: goto out;
3195: }
3196:
3197: /* setup key */
3198: keylen = cipher_keylen(cipher);
3199: ivlen = cipher_ivlen(cipher);
3200: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3201: r = SSH_ERR_ALLOC_FAIL;
3202: goto out;
3203: }
3204: if (strcmp(kdfname, "bcrypt") == 0) {
3205: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3206: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3207: goto out;
3208: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3209: key, keylen + ivlen, rounds) < 0) {
3210: r = SSH_ERR_INVALID_FORMAT;
3211: goto out;
3212: }
3213: }
3214:
3215: /* decrypt private portion of key */
3216: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3217: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3218: key + keylen, ivlen, 0)) != 0)
3219: goto out;
3220: if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3221: sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 0) {
3222: /* an integrity error here indicates an incorrect passphrase */
3223: if (r == SSH_ERR_MAC_INVALID)
3224: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3225: goto out;
3226: }
3227: if ((r = sshbuf_consume(decoded, encrypted_len)) != 0)
3228: goto out;
3229: /* there should be no trailing data */
3230: if (sshbuf_len(decoded) != 0) {
3231: r = SSH_ERR_INVALID_FORMAT;
3232: goto out;
3233: }
3234:
3235: /* check check bytes */
3236: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3237: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3238: goto out;
3239: if (check1 != check2) {
3240: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3241: goto out;
3242: }
3243:
3244: /* Load the private key and comment */
3245: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3246: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3247: goto out;
3248:
3249: /* Check deterministic padding */
3250: i = 0;
3251: while (sshbuf_len(decrypted)) {
3252: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3253: goto out;
3254: if (pad != (++i & 0xff)) {
3255: r = SSH_ERR_INVALID_FORMAT;
3256: goto out;
3257: }
3258: }
3259:
3260: /* XXX decode pubkey and check against private */
3261:
3262: /* success */
3263: r = 0;
3264: if (keyp != NULL) {
3265: *keyp = k;
3266: k = NULL;
3267: }
3268: if (commentp != NULL) {
3269: *commentp = comment;
3270: comment = NULL;
3271: }
3272: out:
3273: pad = 0;
3274: cipher_cleanup(&ciphercontext);
3275: free(ciphername);
3276: free(kdfname);
3277: free(comment);
3278: if (salt != NULL) {
3279: explicit_bzero(salt, slen);
3280: free(salt);
3281: }
3282: if (key != NULL) {
3283: explicit_bzero(key, keylen + ivlen);
3284: free(key);
3285: }
3286: sshbuf_free(encoded);
3287: sshbuf_free(decoded);
3288: sshbuf_free(kdf);
3289: sshbuf_free(decrypted);
3290: sshkey_free(k);
3291: return r;
3292: }
3293:
3294: #if WITH_SSH1
3295: /*
3296: * Serialises the authentication (private) key to a blob, encrypting it with
3297: * passphrase. The identification of the blob (lowest 64 bits of n) will
3298: * precede the key to provide identification of the key without needing a
3299: * passphrase.
3300: */
3301: static int
3302: sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3303: const char *passphrase, const char *comment)
3304: {
3305: struct sshbuf *buffer = NULL, *encrypted = NULL;
3306: u_char buf[8];
3307: int r, cipher_num;
3308: struct sshcipher_ctx ciphercontext;
3309: const struct sshcipher *cipher;
3310: u_char *cp;
3311:
3312: /*
3313: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3314: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3315: */
3316: cipher_num = (strcmp(passphrase, "") == 0) ?
3317: SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3318: if ((cipher = cipher_by_number(cipher_num)) == NULL)
3319: return SSH_ERR_INTERNAL_ERROR;
3320:
3321: /* This buffer is used to build the secret part of the private key. */
3322: if ((buffer = sshbuf_new()) == NULL)
3323: return SSH_ERR_ALLOC_FAIL;
3324:
3325: /* Put checkbytes for checking passphrase validity. */
3326: if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3327: goto out;
3328: arc4random_buf(cp, 2);
3329: memcpy(cp + 2, cp, 2);
3330:
3331: /*
3332: * Store the private key (n and e will not be stored because they
3333: * will be stored in plain text, and storing them also in encrypted
3334: * format would just give known plaintext).
3335: * Note: q and p are stored in reverse order to SSL.
3336: */
3337: if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3338: (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3339: (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3340: (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3341: goto out;
3342:
3343: /* Pad the part to be encrypted to a size that is a multiple of 8. */
3344: explicit_bzero(buf, 8);
3345: if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3346: goto out;
3347:
3348: /* This buffer will be used to contain the data in the file. */
3349: if ((encrypted = sshbuf_new()) == NULL) {
3350: r = SSH_ERR_ALLOC_FAIL;
3351: goto out;
3352: }
3353:
3354: /* First store keyfile id string. */
3355: if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3356: sizeof(LEGACY_BEGIN))) != 0)
3357: goto out;
3358:
3359: /* Store cipher type and "reserved" field. */
3360: if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3361: (r = sshbuf_put_u32(encrypted, 0)) != 0)
3362: goto out;
3363:
3364: /* Store public key. This will be in plain text. */
3365: if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3366: (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3367: (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3368: (r = sshbuf_put_cstring(encrypted, comment) != 0))
3369: goto out;
3370:
3371: /* Allocate space for the private part of the key in the buffer. */
3372: if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3373: goto out;
3374:
3375: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3376: CIPHER_ENCRYPT)) != 0)
3377: goto out;
3378: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3379: sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3380: goto out;
3381: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3382: goto out;
3383:
3384: r = sshbuf_putb(blob, encrypted);
3385:
3386: out:
3387: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3388: explicit_bzero(buf, sizeof(buf));
3389: if (buffer != NULL)
3390: sshbuf_free(buffer);
3391: if (encrypted != NULL)
3392: sshbuf_free(encrypted);
3393:
3394: return r;
3395: }
3396: #endif /* WITH_SSH1 */
3397:
3398: #ifdef WITH_OPENSSL
3399: /* convert SSH v2 key in OpenSSL PEM format */
3400: static int
3401: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3402: const char *_passphrase, const char *comment)
3403: {
3404: int success, r;
3405: int blen, len = strlen(_passphrase);
3406: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3407: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3408: const u_char *bptr;
3409: BIO *bio = NULL;
3410:
3411: if (len > 0 && len <= 4)
3412: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3413: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3414: return SSH_ERR_ALLOC_FAIL;
3415:
3416: switch (key->type) {
3417: case KEY_DSA:
3418: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3419: cipher, passphrase, len, NULL, NULL);
3420: break;
3421: case KEY_ECDSA:
3422: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3423: cipher, passphrase, len, NULL, NULL);
3424: break;
3425: case KEY_RSA:
3426: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3427: cipher, passphrase, len, NULL, NULL);
3428: break;
3429: default:
3430: success = 0;
3431: break;
3432: }
3433: if (success == 0) {
3434: r = SSH_ERR_LIBCRYPTO_ERROR;
3435: goto out;
3436: }
3437: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3438: r = SSH_ERR_INTERNAL_ERROR;
3439: goto out;
3440: }
3441: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3442: goto out;
3443: r = 0;
3444: out:
3445: BIO_free(bio);
3446: return r;
3447: }
3448: #endif /* WITH_OPENSSL */
3449:
3450: /* Serialise "key" to buffer "blob" */
3451: int
3452: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3453: const char *passphrase, const char *comment,
3454: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3455: {
3456: switch (key->type) {
3457: #ifdef WITH_OPENSSL
3458: case KEY_RSA1:
3459: return sshkey_private_rsa1_to_blob(key, blob,
3460: passphrase, comment);
3461: case KEY_DSA:
3462: case KEY_ECDSA:
3463: case KEY_RSA:
3464: if (force_new_format) {
3465: return sshkey_private_to_blob2(key, blob, passphrase,
3466: comment, new_format_cipher, new_format_rounds);
3467: }
3468: return sshkey_private_pem_to_blob(key, blob,
3469: passphrase, comment);
3470: #endif /* WITH_OPENSSL */
3471: case KEY_ED25519:
3472: return sshkey_private_to_blob2(key, blob, passphrase,
3473: comment, new_format_cipher, new_format_rounds);
3474: default:
3475: return SSH_ERR_KEY_TYPE_UNKNOWN;
3476: }
3477: }
3478:
3479: #ifdef WITH_SSH1
3480: /*
3481: * Parse the public, unencrypted portion of a RSA1 key.
3482: */
3483: int
3484: sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3485: struct sshkey **keyp, char **commentp)
3486: {
3487: int r;
3488: struct sshkey *pub = NULL;
3489: struct sshbuf *copy = NULL;
3490:
3491: if (keyp != NULL)
3492: *keyp = NULL;
3493: if (commentp != NULL)
3494: *commentp = NULL;
3495:
3496: /* Check that it is at least big enough to contain the ID string. */
3497: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3498: return SSH_ERR_INVALID_FORMAT;
3499:
3500: /*
3501: * Make sure it begins with the id string. Consume the id string
3502: * from the buffer.
3503: */
3504: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3505: return SSH_ERR_INVALID_FORMAT;
3506: /* Make a working copy of the keyblob and skip past the magic */
3507: if ((copy = sshbuf_fromb(blob)) == NULL)
3508: return SSH_ERR_ALLOC_FAIL;
3509: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3510: goto out;
3511:
3512: /* Skip cipher type, reserved data and key bits. */
3513: if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3514: (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3515: (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3516: goto out;
3517:
3518: /* Read the public key from the buffer. */
3519: if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3520: (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3521: (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3522: goto out;
3523:
3524: /* Finally, the comment */
3525: if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3526: goto out;
3527:
3528: /* The encrypted private part is not parsed by this function. */
3529:
3530: r = 0;
3531: if (keyp != NULL)
3532: *keyp = pub;
3533: else
3534: sshkey_free(pub);
3535: pub = NULL;
3536:
3537: out:
3538: if (copy != NULL)
3539: sshbuf_free(copy);
3540: if (pub != NULL)
3541: sshkey_free(pub);
3542: return r;
3543: }
3544:
3545: static int
3546: sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3547: struct sshkey **keyp, char **commentp)
3548: {
3549: int r;
3550: u_int16_t check1, check2;
3551: u_int8_t cipher_type;
3552: struct sshbuf *decrypted = NULL, *copy = NULL;
3553: u_char *cp;
3554: char *comment = NULL;
3555: struct sshcipher_ctx ciphercontext;
3556: const struct sshcipher *cipher;
3557: struct sshkey *prv = NULL;
3558:
3559: *keyp = NULL;
3560: if (commentp != NULL)
3561: *commentp = NULL;
3562:
3563: /* Check that it is at least big enough to contain the ID string. */
3564: if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3565: return SSH_ERR_INVALID_FORMAT;
3566:
3567: /*
3568: * Make sure it begins with the id string. Consume the id string
3569: * from the buffer.
3570: */
3571: if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3572: return SSH_ERR_INVALID_FORMAT;
3573:
3574: if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3575: r = SSH_ERR_ALLOC_FAIL;
3576: goto out;
3577: }
3578: if ((copy = sshbuf_fromb(blob)) == NULL ||
3579: (decrypted = sshbuf_new()) == NULL) {
3580: r = SSH_ERR_ALLOC_FAIL;
3581: goto out;
3582: }
3583: if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3584: goto out;
3585:
3586: /* Read cipher type. */
3587: if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3588: (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3589: goto out;
3590:
3591: /* Read the public key and comment from the buffer. */
3592: if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3593: (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3594: (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3595: (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3596: goto out;
3597:
3598: /* Check that it is a supported cipher. */
3599: cipher = cipher_by_number(cipher_type);
3600: if (cipher == NULL) {
3601: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3602: goto out;
3603: }
3604: /* Initialize space for decrypted data. */
3605: if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3606: goto out;
3607:
3608: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3609: if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3610: CIPHER_DECRYPT)) != 0)
3611: goto out;
3612: if ((r = cipher_crypt(&ciphercontext, 0, cp,
3613: sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3614: cipher_cleanup(&ciphercontext);
3615: goto out;
3616: }
3617: if ((r = cipher_cleanup(&ciphercontext)) != 0)
3618: goto out;
3619:
3620: if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3621: (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3622: goto out;
3623: if (check1 != check2) {
3624: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3625: goto out;
3626: }
3627:
3628: /* Read the rest of the private key. */
3629: if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3630: (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3631: (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3632: (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3633: goto out;
3634:
3635: /* calculate p-1 and q-1 */
3636: if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3637: goto out;
3638:
3639: /* enable blinding */
3640: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3641: r = SSH_ERR_LIBCRYPTO_ERROR;
3642: goto out;
3643: }
3644: r = 0;
3645: *keyp = prv;
3646: prv = NULL;
3647: if (commentp != NULL) {
3648: *commentp = comment;
3649: comment = NULL;
3650: }
3651: out:
3652: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3653: if (comment != NULL)
3654: free(comment);
3655: if (prv != NULL)
3656: sshkey_free(prv);
3657: if (copy != NULL)
3658: sshbuf_free(copy);
3659: if (decrypted != NULL)
3660: sshbuf_free(decrypted);
3661: return r;
3662: }
3663: #endif /* WITH_SSH1 */
3664:
3665: #ifdef WITH_OPENSSL
3666: /* XXX make private once ssh-keysign.c fixed */
3667: int
3668: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3669: const char *passphrase, struct sshkey **keyp, char **commentp)
3670: {
3671: EVP_PKEY *pk = NULL;
3672: struct sshkey *prv = NULL;
3673: char *name = "<no key>";
3674: BIO *bio = NULL;
3675: int r;
3676:
3677: *keyp = NULL;
3678: if (commentp != NULL)
3679: *commentp = NULL;
3680:
3681: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3682: return SSH_ERR_ALLOC_FAIL;
3683: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3684: (int)sshbuf_len(blob)) {
3685: r = SSH_ERR_ALLOC_FAIL;
3686: goto out;
3687: }
3688:
3689: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3690: (char *)passphrase)) == NULL) {
3691: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3692: goto out;
3693: }
3694: if (pk->type == EVP_PKEY_RSA &&
3695: (type == KEY_UNSPEC || type == KEY_RSA)) {
3696: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3697: r = SSH_ERR_ALLOC_FAIL;
3698: goto out;
3699: }
3700: prv->rsa = EVP_PKEY_get1_RSA(pk);
3701: prv->type = KEY_RSA;
3702: name = "rsa w/o comment";
3703: #ifdef DEBUG_PK
3704: RSA_print_fp(stderr, prv->rsa, 8);
3705: #endif
3706: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3707: r = SSH_ERR_LIBCRYPTO_ERROR;
3708: goto out;
3709: }
3710: } else if (pk->type == EVP_PKEY_DSA &&
3711: (type == KEY_UNSPEC || type == KEY_DSA)) {
3712: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3713: r = SSH_ERR_ALLOC_FAIL;
3714: goto out;
3715: }
3716: prv->dsa = EVP_PKEY_get1_DSA(pk);
3717: prv->type = KEY_DSA;
3718: name = "dsa w/o comment";
3719: #ifdef DEBUG_PK
3720: DSA_print_fp(stderr, prv->dsa, 8);
3721: #endif
3722: } else if (pk->type == EVP_PKEY_EC &&
3723: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3724: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3725: r = SSH_ERR_ALLOC_FAIL;
3726: goto out;
3727: }
3728: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3729: prv->type = KEY_ECDSA;
3730: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3731: if (prv->ecdsa_nid == -1 ||
3732: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3733: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3734: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3735: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3736: r = SSH_ERR_INVALID_FORMAT;
3737: goto out;
3738: }
3739: name = "ecdsa w/o comment";
3740: #ifdef DEBUG_PK
3741: if (prv != NULL && prv->ecdsa != NULL)
3742: sshkey_dump_ec_key(prv->ecdsa);
3743: #endif
3744: } else {
3745: r = SSH_ERR_INVALID_FORMAT;
3746: goto out;
3747: }
3748: if (commentp != NULL &&
3749: (*commentp = strdup(name)) == NULL) {
3750: r = SSH_ERR_ALLOC_FAIL;
3751: goto out;
3752: }
3753: r = 0;
3754: *keyp = prv;
3755: prv = NULL;
3756: out:
3757: BIO_free(bio);
3758: if (pk != NULL)
3759: EVP_PKEY_free(pk);
3760: if (prv != NULL)
3761: sshkey_free(prv);
3762: return r;
3763: }
3764: #endif /* WITH_OPENSSL */
3765:
3766: int
3767: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3768: const char *passphrase, struct sshkey **keyp, char **commentp)
3769: {
3770: int r;
3771:
3772: *keyp = NULL;
3773: if (commentp != NULL)
3774: *commentp = NULL;
3775:
3776: switch (type) {
3777: #ifdef WITH_OPENSSL
3778: case KEY_RSA1:
3779: return sshkey_parse_private_rsa1(blob, passphrase,
3780: keyp, commentp);
3781: case KEY_DSA:
3782: case KEY_ECDSA:
3783: case KEY_RSA:
3784: return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3785: keyp, commentp);
3786: #endif /* WITH_OPENSSL */
3787: case KEY_ED25519:
3788: return sshkey_parse_private2(blob, type, passphrase,
3789: keyp, commentp);
3790: case KEY_UNSPEC:
3791: if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3792: commentp)) == 0)
3793: return 0;
3794: #ifdef WITH_OPENSSL
3795: return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3796: keyp, commentp);
3797: #else
3798: return SSH_ERR_INVALID_FORMAT;
3799: #endif /* WITH_OPENSSL */
3800: default:
3801: return SSH_ERR_KEY_TYPE_UNKNOWN;
3802: }
3803: }
3804:
3805: int
3806: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3807: const char *filename, struct sshkey **keyp, char **commentp)
3808: {
3809: int r;
3810:
3811: if (keyp != NULL)
3812: *keyp = NULL;
3813: if (commentp != NULL)
3814: *commentp = NULL;
3815:
3816: #ifdef WITH_SSH1
3817: /* it's a SSH v1 key if the public key part is readable */
3818: if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3819: return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3820: passphrase, keyp, commentp);
3821: }
3822: #endif /* WITH_SSH1 */
1.2 markus 3823: if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3824: passphrase, keyp, commentp)) == 0)
3825: return 0;
1.1 djm 3826: return r;
3827: }
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