Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.97
1.97 ! djm 1: /* $OpenBSD: sshkey.c,v 1.96 2019/11/25 00:51:37 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4: * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5: * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/types.h>
1.7 djm 29: #include <netinet/in.h>
1.1 djm 30:
1.12 djm 31: #ifdef WITH_OPENSSL
1.1 djm 32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
1.12 djm 35: #endif
1.1 djm 36:
37: #include "crypto_api.h"
38:
39: #include <errno.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <util.h>
1.13 deraadt 43: #include <limits.h>
1.7 djm 44: #include <resolv.h>
1.1 djm 45:
46: #include "ssh2.h"
47: #include "ssherr.h"
48: #include "misc.h"
49: #include "sshbuf.h"
50: #include "cipher.h"
51: #include "digest.h"
52: #define SSHKEY_INTERNAL
53: #include "sshkey.h"
1.11 djm 54: #include "match.h"
1.86 djm 55: #include "ssh-sk.h"
1.1 djm 56:
1.74 dtucker 57: #ifdef WITH_XMSS
58: #include "sshkey-xmss.h"
1.62 markus 59: #include "xmss_fast.h"
1.74 dtucker 60: #endif
1.62 markus 61:
1.1 djm 62: /* openssh private key file format */
63: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
64: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
65: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
66: #define MARK_END_LEN (sizeof(MARK_END) - 1)
67: #define KDFNAME "bcrypt"
68: #define AUTH_MAGIC "openssh-key-v1"
69: #define SALT_LEN 16
1.56 djm 70: #define DEFAULT_CIPHERNAME "aes256-ctr"
1.1 djm 71: #define DEFAULT_ROUNDS 16
72:
73: /* Version identification string for SSH v1 identity files. */
74: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
75:
1.76 djm 76: /*
77: * Constants relating to "shielding" support; protection of keys expected
78: * to remain in memory for long durations
79: */
80: #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024)
81: #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */
82: #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512
83:
84: int sshkey_private_serialize_opt(struct sshkey *key,
1.62 markus 85: struct sshbuf *buf, enum sshkey_serialize_rep);
1.14 djm 86: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 87: struct sshkey **keyp, int allow_cert);
88:
89: /* Supported key types */
90: struct keytype {
91: const char *name;
92: const char *shortname;
1.65 djm 93: const char *sigalg;
1.1 djm 94: int type;
95: int nid;
96: int cert;
1.28 markus 97: int sigonly;
1.1 djm 98: };
99: static const struct keytype keytypes[] = {
1.65 djm 100: { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 },
101: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL,
1.28 markus 102: KEY_ED25519_CERT, 0, 1, 0 },
1.90 markus 103: { "sk-ssh-ed25519@openssh.com", "ED25519-SK", NULL,
104: KEY_ED25519_SK, 0, 0, 0 },
105: { "sk-ssh-ed25519-cert-v01@openssh.com", "ED25519-SK-CERT", NULL,
106: KEY_ED25519_SK_CERT, 0, 1, 0 },
1.62 markus 107: #ifdef WITH_XMSS
1.65 djm 108: { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 },
109: { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL,
1.62 markus 110: KEY_XMSS_CERT, 0, 1, 0 },
111: #endif /* WITH_XMSS */
1.1 djm 112: #ifdef WITH_OPENSSL
1.65 djm 113: { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 },
114: { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 },
115: { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 },
116: { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 },
117: { "ecdsa-sha2-nistp256", "ECDSA", NULL,
118: KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
119: { "ecdsa-sha2-nistp384", "ECDSA", NULL,
120: KEY_ECDSA, NID_secp384r1, 0, 0 },
121: { "ecdsa-sha2-nistp521", "ECDSA", NULL,
122: KEY_ECDSA, NID_secp521r1, 0, 0 },
1.85 djm 123: { "sk-ecdsa-sha2-nistp256@openssh.com", "ECDSA-SK", NULL,
124: KEY_ECDSA_SK, NID_X9_62_prime256v1, 0, 0 },
1.65 djm 125: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL,
126: KEY_RSA_CERT, 0, 1, 0 },
127: { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 128: "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 129: { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 130: "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 131: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL,
132: KEY_DSA_CERT, 0, 1, 0 },
133: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 134: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.65 djm 135: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 136: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.65 djm 137: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL,
138: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.85 djm 139: { "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-SK-CERT", NULL,
140: KEY_ECDSA_SK_CERT, NID_X9_62_prime256v1, 1, 0 },
1.1 djm 141: #endif /* WITH_OPENSSL */
1.65 djm 142: { NULL, NULL, NULL, -1, -1, 0, 0 }
1.1 djm 143: };
144:
145: const char *
146: sshkey_type(const struct sshkey *k)
147: {
148: const struct keytype *kt;
149:
150: for (kt = keytypes; kt->type != -1; kt++) {
151: if (kt->type == k->type)
152: return kt->shortname;
153: }
154: return "unknown";
155: }
156:
157: static const char *
158: sshkey_ssh_name_from_type_nid(int type, int nid)
159: {
160: const struct keytype *kt;
161:
162: for (kt = keytypes; kt->type != -1; kt++) {
163: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
164: return kt->name;
165: }
166: return "ssh-unknown";
167: }
168:
169: int
170: sshkey_type_is_cert(int type)
171: {
172: const struct keytype *kt;
173:
174: for (kt = keytypes; kt->type != -1; kt++) {
175: if (kt->type == type)
176: return kt->cert;
177: }
178: return 0;
179: }
180:
181: const char *
182: sshkey_ssh_name(const struct sshkey *k)
183: {
184: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
185: }
186:
187: const char *
188: sshkey_ssh_name_plain(const struct sshkey *k)
189: {
190: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
191: k->ecdsa_nid);
192: }
193:
194: int
195: sshkey_type_from_name(const char *name)
196: {
197: const struct keytype *kt;
198:
199: for (kt = keytypes; kt->type != -1; kt++) {
200: /* Only allow shortname matches for plain key types */
201: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
202: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
203: return kt->type;
204: }
205: return KEY_UNSPEC;
206: }
207:
1.85 djm 208: static int
209: key_type_is_ecdsa_variant(int type)
210: {
211: switch (type) {
212: case KEY_ECDSA:
213: case KEY_ECDSA_CERT:
214: case KEY_ECDSA_SK:
215: case KEY_ECDSA_SK_CERT:
216: return 1;
217: }
218: return 0;
219: }
220:
1.1 djm 221: int
222: sshkey_ecdsa_nid_from_name(const char *name)
223: {
224: const struct keytype *kt;
225:
1.4 djm 226: for (kt = keytypes; kt->type != -1; kt++) {
1.85 djm 227: if (!key_type_is_ecdsa_variant(kt->type))
1.4 djm 228: continue;
229: if (kt->name != NULL && strcmp(name, kt->name) == 0)
230: return kt->nid;
231: }
1.1 djm 232: return -1;
233: }
234:
235: char *
1.45 djm 236: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 237: {
238: char *tmp, *ret = NULL;
239: size_t nlen, rlen = 0;
240: const struct keytype *kt;
241:
242: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 243: if (kt->name == NULL)
244: continue;
245: if (!include_sigonly && kt->sigonly)
1.1 djm 246: continue;
247: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
248: continue;
249: if (ret != NULL)
1.38 djm 250: ret[rlen++] = sep;
1.1 djm 251: nlen = strlen(kt->name);
252: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
253: free(ret);
254: return NULL;
255: }
256: ret = tmp;
257: memcpy(ret + rlen, kt->name, nlen + 1);
258: rlen += nlen;
259: }
260: return ret;
261: }
262:
263: int
1.11 djm 264: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 265: {
266: char *s, *cp, *p;
1.11 djm 267: const struct keytype *kt;
268: int type;
1.1 djm 269:
270: if (names == NULL || strcmp(names, "") == 0)
271: return 0;
272: if ((s = cp = strdup(names)) == NULL)
273: return 0;
274: for ((p = strsep(&cp, ",")); p && *p != '\0';
275: (p = strsep(&cp, ","))) {
1.11 djm 276: type = sshkey_type_from_name(p);
277: if (type == KEY_UNSPEC) {
278: if (allow_wildcard) {
279: /*
280: * Try matching key types against the string.
281: * If any has a positive or negative match then
282: * the component is accepted.
283: */
284: for (kt = keytypes; kt->type != -1; kt++) {
285: if (match_pattern_list(kt->name,
1.17 djm 286: p, 0) != 0)
1.11 djm 287: break;
288: }
289: if (kt->type != -1)
290: continue;
291: }
1.1 djm 292: free(s);
293: return 0;
294: }
295: }
296: free(s);
297: return 1;
298: }
299:
300: u_int
301: sshkey_size(const struct sshkey *k)
302: {
1.69 djm 303: #ifdef WITH_OPENSSL
304: const BIGNUM *rsa_n, *dsa_p;
305: #endif /* WITH_OPENSSL */
306:
1.1 djm 307: switch (k->type) {
308: #ifdef WITH_OPENSSL
309: case KEY_RSA:
310: case KEY_RSA_CERT:
1.69 djm 311: if (k->rsa == NULL)
312: return 0;
313: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
314: return BN_num_bits(rsa_n);
1.1 djm 315: case KEY_DSA:
316: case KEY_DSA_CERT:
1.69 djm 317: if (k->dsa == NULL)
318: return 0;
319: DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL);
320: return BN_num_bits(dsa_p);
1.1 djm 321: case KEY_ECDSA:
322: case KEY_ECDSA_CERT:
1.85 djm 323: case KEY_ECDSA_SK:
324: case KEY_ECDSA_SK_CERT:
1.1 djm 325: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
326: #endif /* WITH_OPENSSL */
327: case KEY_ED25519:
328: case KEY_ED25519_CERT:
1.90 markus 329: case KEY_ED25519_SK:
330: case KEY_ED25519_SK_CERT:
1.62 markus 331: case KEY_XMSS:
332: case KEY_XMSS_CERT:
1.1 djm 333: return 256; /* XXX */
334: }
335: return 0;
336: }
337:
338: static int
339: sshkey_type_is_valid_ca(int type)
340: {
341: switch (type) {
342: case KEY_RSA:
343: case KEY_DSA:
344: case KEY_ECDSA:
1.85 djm 345: case KEY_ECDSA_SK:
1.1 djm 346: case KEY_ED25519:
1.90 markus 347: case KEY_ED25519_SK:
1.62 markus 348: case KEY_XMSS:
1.1 djm 349: return 1;
350: default:
351: return 0;
352: }
353: }
354:
355: int
356: sshkey_is_cert(const struct sshkey *k)
357: {
358: if (k == NULL)
359: return 0;
360: return sshkey_type_is_cert(k->type);
361: }
362:
1.90 markus 363: int
364: sshkey_is_sk(const struct sshkey *k)
365: {
366: if (k == NULL)
367: return 0;
368: switch (sshkey_type_plain(k->type)) {
369: case KEY_ECDSA_SK:
370: case KEY_ED25519_SK:
371: return 1;
372: default:
373: return 0;
374: }
375: }
376:
1.1 djm 377: /* Return the cert-less equivalent to a certified key type */
378: int
379: sshkey_type_plain(int type)
380: {
381: switch (type) {
382: case KEY_RSA_CERT:
383: return KEY_RSA;
384: case KEY_DSA_CERT:
385: return KEY_DSA;
386: case KEY_ECDSA_CERT:
387: return KEY_ECDSA;
1.85 djm 388: case KEY_ECDSA_SK_CERT:
389: return KEY_ECDSA_SK;
1.1 djm 390: case KEY_ED25519_CERT:
391: return KEY_ED25519;
1.90 markus 392: case KEY_ED25519_SK_CERT:
393: return KEY_ED25519_SK;
1.62 markus 394: case KEY_XMSS_CERT:
395: return KEY_XMSS;
1.1 djm 396: default:
397: return type;
398: }
399: }
400:
401: #ifdef WITH_OPENSSL
402: /* XXX: these are really begging for a table-driven approach */
403: int
404: sshkey_curve_name_to_nid(const char *name)
405: {
406: if (strcmp(name, "nistp256") == 0)
407: return NID_X9_62_prime256v1;
408: else if (strcmp(name, "nistp384") == 0)
409: return NID_secp384r1;
410: else if (strcmp(name, "nistp521") == 0)
411: return NID_secp521r1;
412: else
413: return -1;
414: }
415:
416: u_int
417: sshkey_curve_nid_to_bits(int nid)
418: {
419: switch (nid) {
420: case NID_X9_62_prime256v1:
421: return 256;
422: case NID_secp384r1:
423: return 384;
424: case NID_secp521r1:
425: return 521;
426: default:
427: return 0;
428: }
429: }
430:
431: int
432: sshkey_ecdsa_bits_to_nid(int bits)
433: {
434: switch (bits) {
435: case 256:
436: return NID_X9_62_prime256v1;
437: case 384:
438: return NID_secp384r1;
439: case 521:
440: return NID_secp521r1;
441: default:
442: return -1;
443: }
444: }
445:
446: const char *
447: sshkey_curve_nid_to_name(int nid)
448: {
449: switch (nid) {
450: case NID_X9_62_prime256v1:
451: return "nistp256";
452: case NID_secp384r1:
453: return "nistp384";
454: case NID_secp521r1:
455: return "nistp521";
456: default:
457: return NULL;
458: }
459: }
460:
461: int
462: sshkey_ec_nid_to_hash_alg(int nid)
463: {
464: int kbits = sshkey_curve_nid_to_bits(nid);
465:
466: if (kbits <= 0)
467: return -1;
468:
469: /* RFC5656 section 6.2.1 */
470: if (kbits <= 256)
471: return SSH_DIGEST_SHA256;
472: else if (kbits <= 384)
473: return SSH_DIGEST_SHA384;
474: else
475: return SSH_DIGEST_SHA512;
476: }
477: #endif /* WITH_OPENSSL */
478:
479: static void
480: cert_free(struct sshkey_cert *cert)
481: {
482: u_int i;
483:
484: if (cert == NULL)
485: return;
1.31 mmcc 486: sshbuf_free(cert->certblob);
487: sshbuf_free(cert->critical);
488: sshbuf_free(cert->extensions);
1.29 mmcc 489: free(cert->key_id);
1.1 djm 490: for (i = 0; i < cert->nprincipals; i++)
491: free(cert->principals[i]);
1.29 mmcc 492: free(cert->principals);
1.30 mmcc 493: sshkey_free(cert->signature_key);
1.67 djm 494: free(cert->signature_type);
1.61 jsing 495: freezero(cert, sizeof(*cert));
1.1 djm 496: }
497:
498: static struct sshkey_cert *
499: cert_new(void)
500: {
501: struct sshkey_cert *cert;
502:
503: if ((cert = calloc(1, sizeof(*cert))) == NULL)
504: return NULL;
505: if ((cert->certblob = sshbuf_new()) == NULL ||
506: (cert->critical = sshbuf_new()) == NULL ||
507: (cert->extensions = sshbuf_new()) == NULL) {
508: cert_free(cert);
509: return NULL;
510: }
511: cert->key_id = NULL;
512: cert->principals = NULL;
513: cert->signature_key = NULL;
1.67 djm 514: cert->signature_type = NULL;
1.1 djm 515: return cert;
516: }
517:
518: struct sshkey *
519: sshkey_new(int type)
520: {
521: struct sshkey *k;
522: #ifdef WITH_OPENSSL
523: RSA *rsa;
524: DSA *dsa;
525: #endif /* WITH_OPENSSL */
526:
527: if ((k = calloc(1, sizeof(*k))) == NULL)
528: return NULL;
529: k->type = type;
530: k->ecdsa = NULL;
531: k->ecdsa_nid = -1;
532: k->dsa = NULL;
533: k->rsa = NULL;
534: k->cert = NULL;
535: k->ed25519_sk = NULL;
536: k->ed25519_pk = NULL;
1.62 markus 537: k->xmss_sk = NULL;
538: k->xmss_pk = NULL;
1.1 djm 539: switch (k->type) {
540: #ifdef WITH_OPENSSL
541: case KEY_RSA:
542: case KEY_RSA_CERT:
1.69 djm 543: if ((rsa = RSA_new()) == NULL) {
1.1 djm 544: free(k);
545: return NULL;
546: }
547: k->rsa = rsa;
548: break;
549: case KEY_DSA:
550: case KEY_DSA_CERT:
1.69 djm 551: if ((dsa = DSA_new()) == NULL) {
1.1 djm 552: free(k);
553: return NULL;
554: }
555: k->dsa = dsa;
556: break;
557: case KEY_ECDSA:
558: case KEY_ECDSA_CERT:
1.85 djm 559: case KEY_ECDSA_SK:
560: case KEY_ECDSA_SK_CERT:
1.1 djm 561: /* Cannot do anything until we know the group */
562: break;
563: #endif /* WITH_OPENSSL */
564: case KEY_ED25519:
565: case KEY_ED25519_CERT:
1.90 markus 566: case KEY_ED25519_SK:
567: case KEY_ED25519_SK_CERT:
1.62 markus 568: case KEY_XMSS:
569: case KEY_XMSS_CERT:
1.1 djm 570: /* no need to prealloc */
571: break;
572: case KEY_UNSPEC:
573: break;
574: default:
575: free(k);
576: return NULL;
577: }
578:
579: if (sshkey_is_cert(k)) {
580: if ((k->cert = cert_new()) == NULL) {
581: sshkey_free(k);
582: return NULL;
583: }
584: }
585:
586: return k;
587: }
588:
589: void
590: sshkey_free(struct sshkey *k)
591: {
592: if (k == NULL)
593: return;
594: switch (k->type) {
595: #ifdef WITH_OPENSSL
596: case KEY_RSA:
597: case KEY_RSA_CERT:
1.60 jsing 598: RSA_free(k->rsa);
1.1 djm 599: k->rsa = NULL;
600: break;
601: case KEY_DSA:
602: case KEY_DSA_CERT:
1.60 jsing 603: DSA_free(k->dsa);
1.1 djm 604: k->dsa = NULL;
605: break;
1.85 djm 606: case KEY_ECDSA_SK:
607: case KEY_ECDSA_SK_CERT:
608: free(k->sk_application);
609: sshbuf_free(k->sk_key_handle);
610: sshbuf_free(k->sk_reserved);
611: /* FALLTHROUGH */
1.1 djm 612: case KEY_ECDSA:
613: case KEY_ECDSA_CERT:
1.60 jsing 614: EC_KEY_free(k->ecdsa);
1.1 djm 615: k->ecdsa = NULL;
616: break;
617: #endif /* WITH_OPENSSL */
1.90 markus 618: case KEY_ED25519_SK:
619: case KEY_ED25519_SK_CERT:
620: free(k->sk_application);
621: sshbuf_free(k->sk_key_handle);
622: sshbuf_free(k->sk_reserved);
623: /* FALLTHROUGH */
1.1 djm 624: case KEY_ED25519:
625: case KEY_ED25519_CERT:
1.61 jsing 626: freezero(k->ed25519_pk, ED25519_PK_SZ);
627: k->ed25519_pk = NULL;
628: freezero(k->ed25519_sk, ED25519_SK_SZ);
629: k->ed25519_sk = NULL;
1.1 djm 630: break;
1.62 markus 631: #ifdef WITH_XMSS
632: case KEY_XMSS:
633: case KEY_XMSS_CERT:
634: freezero(k->xmss_pk, sshkey_xmss_pklen(k));
635: k->xmss_pk = NULL;
636: freezero(k->xmss_sk, sshkey_xmss_sklen(k));
637: k->xmss_sk = NULL;
638: sshkey_xmss_free_state(k);
639: free(k->xmss_name);
640: k->xmss_name = NULL;
641: free(k->xmss_filename);
642: k->xmss_filename = NULL;
643: break;
644: #endif /* WITH_XMSS */
1.1 djm 645: case KEY_UNSPEC:
646: break;
647: default:
648: break;
649: }
650: if (sshkey_is_cert(k))
651: cert_free(k->cert);
1.76 djm 652: freezero(k->shielded_private, k->shielded_len);
653: freezero(k->shield_prekey, k->shield_prekey_len);
1.61 jsing 654: freezero(k, sizeof(*k));
1.1 djm 655: }
656:
657: static int
658: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
659: {
660: if (a == NULL && b == NULL)
661: return 1;
662: if (a == NULL || b == NULL)
663: return 0;
664: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
665: return 0;
666: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
667: sshbuf_len(a->certblob)) != 0)
668: return 0;
669: return 1;
670: }
671:
672: /*
673: * Compare public portions of key only, allowing comparisons between
674: * certificates and plain keys too.
675: */
676: int
677: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
678: {
679: #ifdef WITH_OPENSSL
1.69 djm 680: const BIGNUM *rsa_e_a, *rsa_n_a;
681: const BIGNUM *rsa_e_b, *rsa_n_b;
682: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
683: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 684: #endif /* WITH_OPENSSL */
685:
686: if (a == NULL || b == NULL ||
687: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
688: return 0;
689:
690: switch (a->type) {
691: #ifdef WITH_OPENSSL
692: case KEY_RSA_CERT:
693: case KEY_RSA:
1.69 djm 694: if (a->rsa == NULL || b->rsa == NULL)
695: return 0;
696: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
697: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
698: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
699: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 700: case KEY_DSA_CERT:
701: case KEY_DSA:
1.69 djm 702: if (a->dsa == NULL || b->dsa == NULL)
703: return 0;
704: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
705: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
706: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
707: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
708: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
709: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
710: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
711: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.85 djm 712: case KEY_ECDSA_SK:
713: case KEY_ECDSA_SK_CERT:
714: if (a->sk_application == NULL || b->sk_application == NULL)
715: return 0;
716: if (strcmp(a->sk_application, b->sk_application) != 0)
717: return 0;
718: /* FALLTHROUGH */
1.1 djm 719: case KEY_ECDSA_CERT:
720: case KEY_ECDSA:
721: if (a->ecdsa == NULL || b->ecdsa == NULL ||
722: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
723: EC_KEY_get0_public_key(b->ecdsa) == NULL)
724: return 0;
725: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
1.93 djm 726: EC_KEY_get0_group(b->ecdsa), NULL) != 0 ||
1.1 djm 727: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
728: EC_KEY_get0_public_key(a->ecdsa),
1.93 djm 729: EC_KEY_get0_public_key(b->ecdsa), NULL) != 0)
1.1 djm 730: return 0;
731: return 1;
732: #endif /* WITH_OPENSSL */
1.90 markus 733: case KEY_ED25519_SK:
734: case KEY_ED25519_SK_CERT:
735: if (a->sk_application == NULL || b->sk_application == NULL)
736: return 0;
737: if (strcmp(a->sk_application, b->sk_application) != 0)
738: return 0;
739: /* FALLTHROUGH */
1.1 djm 740: case KEY_ED25519:
741: case KEY_ED25519_CERT:
742: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
743: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 744: #ifdef WITH_XMSS
745: case KEY_XMSS:
746: case KEY_XMSS_CERT:
747: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
748: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
749: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
750: #endif /* WITH_XMSS */
1.1 djm 751: default:
752: return 0;
753: }
754: /* NOTREACHED */
755: }
756:
757: int
758: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
759: {
760: if (a == NULL || b == NULL || a->type != b->type)
761: return 0;
762: if (sshkey_is_cert(a)) {
763: if (!cert_compare(a->cert, b->cert))
764: return 0;
765: }
766: return sshkey_equal_public(a, b);
767: }
768:
769: static int
1.62 markus 770: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
771: enum sshkey_serialize_rep opts)
1.1 djm 772: {
773: int type, ret = SSH_ERR_INTERNAL_ERROR;
774: const char *typename;
1.69 djm 775: #ifdef WITH_OPENSSL
776: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
777: #endif /* WITH_OPENSSL */
1.1 djm 778:
779: if (key == NULL)
780: return SSH_ERR_INVALID_ARGUMENT;
781:
1.19 djm 782: if (sshkey_is_cert(key)) {
783: if (key->cert == NULL)
784: return SSH_ERR_EXPECTED_CERT;
785: if (sshbuf_len(key->cert->certblob) == 0)
786: return SSH_ERR_KEY_LACKS_CERTBLOB;
787: }
1.1 djm 788: type = force_plain ? sshkey_type_plain(key->type) : key->type;
789: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
790:
791: switch (type) {
792: #ifdef WITH_OPENSSL
793: case KEY_DSA_CERT:
794: case KEY_ECDSA_CERT:
1.85 djm 795: case KEY_ECDSA_SK_CERT:
1.1 djm 796: case KEY_RSA_CERT:
797: #endif /* WITH_OPENSSL */
798: case KEY_ED25519_CERT:
1.95 djm 799: case KEY_ED25519_SK_CERT:
1.62 markus 800: #ifdef WITH_XMSS
801: case KEY_XMSS_CERT:
802: #endif /* WITH_XMSS */
1.1 djm 803: /* Use the existing blob */
804: /* XXX modified flag? */
805: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
806: return ret;
807: break;
808: #ifdef WITH_OPENSSL
809: case KEY_DSA:
810: if (key->dsa == NULL)
811: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 812: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
813: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 814: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 815: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
816: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
817: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
818: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 819: return ret;
820: break;
821: case KEY_ECDSA:
1.85 djm 822: case KEY_ECDSA_SK:
1.1 djm 823: if (key->ecdsa == NULL)
824: return SSH_ERR_INVALID_ARGUMENT;
825: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
826: (ret = sshbuf_put_cstring(b,
827: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
828: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
829: return ret;
1.85 djm 830: if (type == KEY_ECDSA_SK) {
831: if ((ret = sshbuf_put_cstring(b,
832: key->sk_application)) != 0)
833: return ret;
834: }
1.1 djm 835: break;
836: case KEY_RSA:
837: if (key->rsa == NULL)
838: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 839: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 840: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 841: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
842: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 843: return ret;
844: break;
845: #endif /* WITH_OPENSSL */
846: case KEY_ED25519:
1.90 markus 847: case KEY_ED25519_SK:
1.1 djm 848: if (key->ed25519_pk == NULL)
849: return SSH_ERR_INVALID_ARGUMENT;
850: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
851: (ret = sshbuf_put_string(b,
852: key->ed25519_pk, ED25519_PK_SZ)) != 0)
853: return ret;
1.90 markus 854: if (type == KEY_ED25519_SK) {
855: if ((ret = sshbuf_put_cstring(b,
856: key->sk_application)) != 0)
857: return ret;
858: }
1.1 djm 859: break;
1.62 markus 860: #ifdef WITH_XMSS
861: case KEY_XMSS:
862: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
863: sshkey_xmss_pklen(key) == 0)
864: return SSH_ERR_INVALID_ARGUMENT;
865: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
866: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
867: (ret = sshbuf_put_string(b,
868: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
869: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
870: return ret;
871: break;
872: #endif /* WITH_XMSS */
1.1 djm 873: default:
874: return SSH_ERR_KEY_TYPE_UNKNOWN;
875: }
876: return 0;
877: }
878:
879: int
1.14 djm 880: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 881: {
1.62 markus 882: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 883: }
884:
885: int
1.62 markus 886: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
887: enum sshkey_serialize_rep opts)
1.14 djm 888: {
889: struct sshbuf *tmp;
890: int r;
891:
892: if ((tmp = sshbuf_new()) == NULL)
893: return SSH_ERR_ALLOC_FAIL;
1.62 markus 894: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 895: if (r == 0)
896: r = sshbuf_put_stringb(b, tmp);
897: sshbuf_free(tmp);
898: return r;
899: }
900:
901: int
1.62 markus 902: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
903: {
904: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
905: }
906:
907: int
1.14 djm 908: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 909: {
1.62 markus 910: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 911: }
912:
913: static int
1.62 markus 914: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
915: enum sshkey_serialize_rep opts)
1.1 djm 916: {
917: int ret = SSH_ERR_INTERNAL_ERROR;
918: size_t len;
919: struct sshbuf *b = NULL;
920:
921: if (lenp != NULL)
922: *lenp = 0;
923: if (blobp != NULL)
924: *blobp = NULL;
925: if ((b = sshbuf_new()) == NULL)
926: return SSH_ERR_ALLOC_FAIL;
1.62 markus 927: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 928: goto out;
929: len = sshbuf_len(b);
930: if (lenp != NULL)
931: *lenp = len;
932: if (blobp != NULL) {
933: if ((*blobp = malloc(len)) == NULL) {
934: ret = SSH_ERR_ALLOC_FAIL;
935: goto out;
936: }
937: memcpy(*blobp, sshbuf_ptr(b), len);
938: }
939: ret = 0;
940: out:
941: sshbuf_free(b);
942: return ret;
943: }
944:
945: int
946: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
947: {
1.62 markus 948: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 949: }
950:
951: int
952: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
953: {
1.62 markus 954: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 955: }
956:
957: int
1.7 djm 958: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 959: u_char **retp, size_t *lenp)
960: {
961: u_char *blob = NULL, *ret = NULL;
962: size_t blob_len = 0;
1.7 djm 963: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 964:
965: if (retp != NULL)
966: *retp = NULL;
967: if (lenp != NULL)
968: *lenp = 0;
1.7 djm 969: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 970: r = SSH_ERR_INVALID_ARGUMENT;
971: goto out;
972: }
1.62 markus 973: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
974: != 0)
1.1 djm 975: goto out;
976: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
977: r = SSH_ERR_ALLOC_FAIL;
978: goto out;
979: }
1.7 djm 980: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 981: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
982: goto out;
983: /* success */
984: if (retp != NULL) {
985: *retp = ret;
986: ret = NULL;
987: }
988: if (lenp != NULL)
1.7 djm 989: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 990: r = 0;
991: out:
992: free(ret);
993: if (blob != NULL) {
994: explicit_bzero(blob, blob_len);
995: free(blob);
996: }
997: return r;
998: }
999:
1000: static char *
1.7 djm 1001: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1002: {
1003: char *ret;
1004: size_t plen = strlen(alg) + 1;
1005: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
1006:
1007: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
1008: return NULL;
1009: strlcpy(ret, alg, rlen);
1010: strlcat(ret, ":", rlen);
1011: if (dgst_raw_len == 0)
1012: return ret;
1.79 dtucker 1013: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 1014: freezero(ret, rlen);
1.7 djm 1015: return NULL;
1016: }
1017: /* Trim padding characters from end */
1018: ret[strcspn(ret, "=")] = '\0';
1019: return ret;
1020: }
1021:
1022: static char *
1023: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 1024: {
1.7 djm 1025: char *retval, hex[5];
1026: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 1027:
1.7 djm 1028: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 1029: return NULL;
1.7 djm 1030: strlcpy(retval, alg, rlen);
1031: strlcat(retval, ":", rlen);
1.1 djm 1032: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 1033: snprintf(hex, sizeof(hex), "%s%02x",
1034: i > 0 ? ":" : "", dgst_raw[i]);
1035: strlcat(retval, hex, rlen);
1.1 djm 1036: }
1037: return retval;
1038: }
1039:
1040: static char *
1041: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
1042: {
1043: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1044: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1045: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1046: u_int i, j = 0, rounds, seed = 1;
1047: char *retval;
1048:
1049: rounds = (dgst_raw_len / 2) + 1;
1050: if ((retval = calloc(rounds, 6)) == NULL)
1051: return NULL;
1052: retval[j++] = 'x';
1053: for (i = 0; i < rounds; i++) {
1054: u_int idx0, idx1, idx2, idx3, idx4;
1055: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1056: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1057: seed) % 6;
1058: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1059: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1060: (seed / 6)) % 6;
1061: retval[j++] = vowels[idx0];
1062: retval[j++] = consonants[idx1];
1063: retval[j++] = vowels[idx2];
1064: if ((i + 1) < rounds) {
1065: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1066: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1067: retval[j++] = consonants[idx3];
1068: retval[j++] = '-';
1069: retval[j++] = consonants[idx4];
1070: seed = ((seed * 5) +
1071: ((((u_int)(dgst_raw[2 * i])) * 7) +
1072: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1073: }
1074: } else {
1075: idx0 = seed % 6;
1076: idx1 = 16;
1077: idx2 = seed / 6;
1078: retval[j++] = vowels[idx0];
1079: retval[j++] = consonants[idx1];
1080: retval[j++] = vowels[idx2];
1081: }
1082: }
1083: retval[j++] = 'x';
1084: retval[j++] = '\0';
1085: return retval;
1086: }
1087:
1088: /*
1089: * Draw an ASCII-Art representing the fingerprint so human brain can
1090: * profit from its built-in pattern recognition ability.
1091: * This technique is called "random art" and can be found in some
1092: * scientific publications like this original paper:
1093: *
1094: * "Hash Visualization: a New Technique to improve Real-World Security",
1095: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1096: * Techniques and E-Commerce (CrypTEC '99)
1097: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1098: *
1099: * The subject came up in a talk by Dan Kaminsky, too.
1100: *
1101: * If you see the picture is different, the key is different.
1102: * If the picture looks the same, you still know nothing.
1103: *
1104: * The algorithm used here is a worm crawling over a discrete plane,
1105: * leaving a trace (augmenting the field) everywhere it goes.
1106: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1107: * makes the respective movement vector be ignored for this turn.
1108: * Graphs are not unambiguous, because circles in graphs can be
1109: * walked in either direction.
1110: */
1111:
1112: /*
1113: * Field sizes for the random art. Have to be odd, so the starting point
1114: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1115: * Else pictures would be too dense, and drawing the frame would
1116: * fail, too, because the key type would not fit in anymore.
1117: */
1118: #define FLDBASE 8
1119: #define FLDSIZE_Y (FLDBASE + 1)
1120: #define FLDSIZE_X (FLDBASE * 2 + 1)
1121: static char *
1.7 djm 1122: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1123: const struct sshkey *k)
1124: {
1125: /*
1126: * Chars to be used after each other every time the worm
1127: * intersects with itself. Matter of taste.
1128: */
1129: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1130: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1131: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1132: size_t i, tlen, hlen;
1.1 djm 1133: u_int b;
1.3 djm 1134: int x, y, r;
1.1 djm 1135: size_t len = strlen(augmentation_string) - 1;
1136:
1137: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1138: return NULL;
1139:
1140: /* initialize field */
1141: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1142: x = FLDSIZE_X / 2;
1143: y = FLDSIZE_Y / 2;
1144:
1145: /* process raw key */
1146: for (i = 0; i < dgst_raw_len; i++) {
1147: int input;
1148: /* each byte conveys four 2-bit move commands */
1149: input = dgst_raw[i];
1150: for (b = 0; b < 4; b++) {
1151: /* evaluate 2 bit, rest is shifted later */
1152: x += (input & 0x1) ? 1 : -1;
1153: y += (input & 0x2) ? 1 : -1;
1154:
1155: /* assure we are still in bounds */
1.37 deraadt 1156: x = MAXIMUM(x, 0);
1157: y = MAXIMUM(y, 0);
1158: x = MINIMUM(x, FLDSIZE_X - 1);
1159: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1160:
1161: /* augment the field */
1162: if (field[x][y] < len - 2)
1163: field[x][y]++;
1164: input = input >> 2;
1165: }
1166: }
1167:
1168: /* mark starting point and end point*/
1169: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1170: field[x][y] = len;
1171:
1.3 djm 1172: /* assemble title */
1173: r = snprintf(title, sizeof(title), "[%s %u]",
1174: sshkey_type(k), sshkey_size(k));
1175: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1176: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1177: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1178: tlen = (r <= 0) ? 0 : strlen(title);
1179:
1180: /* assemble hash ID. */
1181: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1182: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1183:
1184: /* output upper border */
1.3 djm 1185: p = retval;
1186: *p++ = '+';
1187: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1188: *p++ = '-';
1189: memcpy(p, title, tlen);
1190: p += tlen;
1.7 djm 1191: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1192: *p++ = '-';
1193: *p++ = '+';
1194: *p++ = '\n';
1195:
1196: /* output content */
1197: for (y = 0; y < FLDSIZE_Y; y++) {
1198: *p++ = '|';
1199: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1200: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1201: *p++ = '|';
1202: *p++ = '\n';
1203: }
1204:
1205: /* output lower border */
1206: *p++ = '+';
1.7 djm 1207: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1208: *p++ = '-';
1209: memcpy(p, hash, hlen);
1210: p += hlen;
1211: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1212: *p++ = '-';
1213: *p++ = '+';
1214:
1215: return retval;
1216: }
1217:
1218: char *
1.7 djm 1219: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1220: enum sshkey_fp_rep dgst_rep)
1221: {
1222: char *retval = NULL;
1223: u_char *dgst_raw;
1224: size_t dgst_raw_len;
1225:
1.7 djm 1226: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1227: return NULL;
1228: switch (dgst_rep) {
1.7 djm 1229: case SSH_FP_DEFAULT:
1230: if (dgst_alg == SSH_DIGEST_MD5) {
1231: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1232: dgst_raw, dgst_raw_len);
1233: } else {
1234: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1235: dgst_raw, dgst_raw_len);
1236: }
1237: break;
1.1 djm 1238: case SSH_FP_HEX:
1.7 djm 1239: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1240: dgst_raw, dgst_raw_len);
1241: break;
1242: case SSH_FP_BASE64:
1243: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1244: dgst_raw, dgst_raw_len);
1.1 djm 1245: break;
1246: case SSH_FP_BUBBLEBABBLE:
1247: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1248: break;
1249: case SSH_FP_RANDOMART:
1.7 djm 1250: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1251: dgst_raw, dgst_raw_len, k);
1.1 djm 1252: break;
1253: default:
1254: explicit_bzero(dgst_raw, dgst_raw_len);
1255: free(dgst_raw);
1256: return NULL;
1257: }
1258: explicit_bzero(dgst_raw, dgst_raw_len);
1259: free(dgst_raw);
1260: return retval;
1261: }
1262:
1.63 djm 1263: static int
1264: peek_type_nid(const char *s, size_t l, int *nid)
1265: {
1266: const struct keytype *kt;
1267:
1268: for (kt = keytypes; kt->type != -1; kt++) {
1269: if (kt->name == NULL || strlen(kt->name) != l)
1270: continue;
1271: if (memcmp(s, kt->name, l) == 0) {
1272: *nid = -1;
1.85 djm 1273: if (key_type_is_ecdsa_variant(kt->type))
1.63 djm 1274: *nid = kt->nid;
1275: return kt->type;
1276: }
1277: }
1278: return KEY_UNSPEC;
1279: }
1280:
1.1 djm 1281:
1.63 djm 1282: /* XXX this can now be made const char * */
1.1 djm 1283: int
1284: sshkey_read(struct sshkey *ret, char **cpp)
1285: {
1286: struct sshkey *k;
1.63 djm 1287: char *cp, *blobcopy;
1288: size_t space;
1.1 djm 1289: int r, type, curve_nid = -1;
1290: struct sshbuf *blob;
1.44 dtucker 1291:
1292: if (ret == NULL)
1293: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1294:
1295: switch (ret->type) {
1296: case KEY_UNSPEC:
1297: case KEY_RSA:
1298: case KEY_DSA:
1299: case KEY_ECDSA:
1.85 djm 1300: case KEY_ECDSA_SK:
1.1 djm 1301: case KEY_ED25519:
1.90 markus 1302: case KEY_ED25519_SK:
1.1 djm 1303: case KEY_DSA_CERT:
1304: case KEY_ECDSA_CERT:
1.85 djm 1305: case KEY_ECDSA_SK_CERT:
1.1 djm 1306: case KEY_RSA_CERT:
1307: case KEY_ED25519_CERT:
1.90 markus 1308: case KEY_ED25519_SK_CERT:
1.62 markus 1309: #ifdef WITH_XMSS
1310: case KEY_XMSS:
1311: case KEY_XMSS_CERT:
1312: #endif /* WITH_XMSS */
1.63 djm 1313: break; /* ok */
1314: default:
1315: return SSH_ERR_INVALID_ARGUMENT;
1316: }
1317:
1318: /* Decode type */
1319: cp = *cpp;
1320: space = strcspn(cp, " \t");
1321: if (space == strlen(cp))
1322: return SSH_ERR_INVALID_FORMAT;
1323: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1324: return SSH_ERR_INVALID_FORMAT;
1325:
1326: /* skip whitespace */
1327: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1328: ;
1329: if (*cp == '\0')
1330: return SSH_ERR_INVALID_FORMAT;
1331: if (ret->type != KEY_UNSPEC && ret->type != type)
1332: return SSH_ERR_KEY_TYPE_MISMATCH;
1333: if ((blob = sshbuf_new()) == NULL)
1334: return SSH_ERR_ALLOC_FAIL;
1335:
1336: /* find end of keyblob and decode */
1337: space = strcspn(cp, " \t");
1338: if ((blobcopy = strndup(cp, space)) == NULL) {
1339: sshbuf_free(blob);
1340: return SSH_ERR_ALLOC_FAIL;
1341: }
1342: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1343: free(blobcopy);
1344: sshbuf_free(blob);
1345: return r;
1346: }
1347: free(blobcopy);
1348: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1349: sshbuf_free(blob);
1.63 djm 1350: return r;
1351: }
1352: sshbuf_free(blob);
1353:
1354: /* skip whitespace and leave cp at start of comment */
1355: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1356: ;
1357:
1358: /* ensure type of blob matches type at start of line */
1359: if (k->type != type) {
1360: sshkey_free(k);
1361: return SSH_ERR_KEY_TYPE_MISMATCH;
1362: }
1.85 djm 1363: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1364: sshkey_free(k);
1365: return SSH_ERR_EC_CURVE_MISMATCH;
1366: }
1367:
1368: /* Fill in ret from parsed key */
1369: ret->type = type;
1370: if (sshkey_is_cert(ret)) {
1371: if (!sshkey_is_cert(k)) {
1.1 djm 1372: sshkey_free(k);
1.63 djm 1373: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1374: }
1.63 djm 1375: if (ret->cert != NULL)
1376: cert_free(ret->cert);
1377: ret->cert = k->cert;
1378: k->cert = NULL;
1379: }
1380: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1381: #ifdef WITH_OPENSSL
1.63 djm 1382: case KEY_RSA:
1383: RSA_free(ret->rsa);
1384: ret->rsa = k->rsa;
1385: k->rsa = NULL;
1.1 djm 1386: #ifdef DEBUG_PK
1.63 djm 1387: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1388: #endif
1.63 djm 1389: break;
1390: case KEY_DSA:
1391: DSA_free(ret->dsa);
1392: ret->dsa = k->dsa;
1393: k->dsa = NULL;
1.1 djm 1394: #ifdef DEBUG_PK
1.63 djm 1395: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1396: #endif
1.63 djm 1397: break;
1398: case KEY_ECDSA:
1399: EC_KEY_free(ret->ecdsa);
1400: ret->ecdsa = k->ecdsa;
1401: ret->ecdsa_nid = k->ecdsa_nid;
1402: k->ecdsa = NULL;
1403: k->ecdsa_nid = -1;
1.1 djm 1404: #ifdef DEBUG_PK
1.63 djm 1405: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1406: #endif
1.63 djm 1407: break;
1.85 djm 1408: case KEY_ECDSA_SK:
1409: EC_KEY_free(ret->ecdsa);
1410: ret->ecdsa = k->ecdsa;
1411: ret->ecdsa_nid = k->ecdsa_nid;
1412: ret->sk_application = k->sk_application;
1413: k->ecdsa = NULL;
1414: k->ecdsa_nid = -1;
1415: k->sk_application = NULL;
1416: #ifdef DEBUG_PK
1417: sshkey_dump_ec_key(ret->ecdsa);
1418: fprintf(stderr, "App: %s\n", ret->sk_application);
1419: #endif
1420: break;
1.1 djm 1421: #endif /* WITH_OPENSSL */
1.63 djm 1422: case KEY_ED25519:
1423: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1424: ret->ed25519_pk = k->ed25519_pk;
1425: k->ed25519_pk = NULL;
1.1 djm 1426: #ifdef DEBUG_PK
1.63 djm 1427: /* XXX */
1.1 djm 1428: #endif
1.63 djm 1429: break;
1.90 markus 1430: case KEY_ED25519_SK:
1431: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1432: ret->ed25519_pk = k->ed25519_pk;
1433: ret->sk_application = k->sk_application;
1434: k->ed25519_pk = NULL;
1435: k->sk_application = NULL;
1436: break;
1.62 markus 1437: #ifdef WITH_XMSS
1.63 djm 1438: case KEY_XMSS:
1439: free(ret->xmss_pk);
1440: ret->xmss_pk = k->xmss_pk;
1441: k->xmss_pk = NULL;
1442: free(ret->xmss_state);
1443: ret->xmss_state = k->xmss_state;
1444: k->xmss_state = NULL;
1445: free(ret->xmss_name);
1446: ret->xmss_name = k->xmss_name;
1447: k->xmss_name = NULL;
1448: free(ret->xmss_filename);
1449: ret->xmss_filename = k->xmss_filename;
1450: k->xmss_filename = NULL;
1.62 markus 1451: #ifdef DEBUG_PK
1.63 djm 1452: /* XXX */
1.62 markus 1453: #endif
1.63 djm 1454: break;
1.62 markus 1455: #endif /* WITH_XMSS */
1.63 djm 1456: default:
1.1 djm 1457: sshkey_free(k);
1.63 djm 1458: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1459: }
1.63 djm 1460: sshkey_free(k);
1461:
1462: /* success */
1463: *cpp = cp;
1464: return 0;
1.1 djm 1465: }
1466:
1467: int
1.19 djm 1468: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1469: {
1.19 djm 1470: int r = SSH_ERR_INTERNAL_ERROR;
1471: struct sshbuf *b = NULL;
1.1 djm 1472: char *uu = NULL;
1.19 djm 1473:
1474: if (b64p != NULL)
1475: *b64p = NULL;
1476: if ((b = sshbuf_new()) == NULL)
1477: return SSH_ERR_ALLOC_FAIL;
1478: if ((r = sshkey_putb(key, b)) != 0)
1479: goto out;
1.81 djm 1480: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1481: r = SSH_ERR_ALLOC_FAIL;
1482: goto out;
1483: }
1484: /* Success */
1485: if (b64p != NULL) {
1486: *b64p = uu;
1487: uu = NULL;
1488: }
1489: r = 0;
1490: out:
1491: sshbuf_free(b);
1492: free(uu);
1493: return r;
1494: }
1495:
1.52 djm 1496: int
1.19 djm 1497: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1498: {
1499: int r = SSH_ERR_INTERNAL_ERROR;
1500: char *uu = NULL;
1501:
1.48 djm 1502: if ((r = sshkey_to_base64(key, &uu)) != 0)
1503: goto out;
1504: if ((r = sshbuf_putf(b, "%s %s",
1505: sshkey_ssh_name(key), uu)) != 0)
1506: goto out;
1.19 djm 1507: r = 0;
1508: out:
1509: free(uu);
1510: return r;
1511: }
1512:
1513: int
1514: sshkey_write(const struct sshkey *key, FILE *f)
1515: {
1516: struct sshbuf *b = NULL;
1517: int r = SSH_ERR_INTERNAL_ERROR;
1518:
1519: if ((b = sshbuf_new()) == NULL)
1520: return SSH_ERR_ALLOC_FAIL;
1521: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1522: goto out;
1523: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1524: if (feof(f))
1525: errno = EPIPE;
1.19 djm 1526: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1527: goto out;
1528: }
1.19 djm 1529: /* Success */
1530: r = 0;
1.1 djm 1531: out:
1.19 djm 1532: sshbuf_free(b);
1533: return r;
1.1 djm 1534: }
1535:
1536: const char *
1537: sshkey_cert_type(const struct sshkey *k)
1538: {
1539: switch (k->cert->type) {
1540: case SSH2_CERT_TYPE_USER:
1541: return "user";
1542: case SSH2_CERT_TYPE_HOST:
1543: return "host";
1544: default:
1545: return "unknown";
1546: }
1547: }
1548:
1549: #ifdef WITH_OPENSSL
1550: static int
1551: rsa_generate_private_key(u_int bits, RSA **rsap)
1552: {
1553: RSA *private = NULL;
1554: BIGNUM *f4 = NULL;
1555: int ret = SSH_ERR_INTERNAL_ERROR;
1556:
1.49 djm 1557: if (rsap == NULL)
1558: return SSH_ERR_INVALID_ARGUMENT;
1559: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1560: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1561: return SSH_ERR_KEY_LENGTH;
1.1 djm 1562: *rsap = NULL;
1563: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1564: ret = SSH_ERR_ALLOC_FAIL;
1565: goto out;
1566: }
1567: if (!BN_set_word(f4, RSA_F4) ||
1568: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1569: ret = SSH_ERR_LIBCRYPTO_ERROR;
1570: goto out;
1571: }
1572: *rsap = private;
1573: private = NULL;
1574: ret = 0;
1575: out:
1.60 jsing 1576: RSA_free(private);
1577: BN_free(f4);
1.1 djm 1578: return ret;
1579: }
1580:
1581: static int
1582: dsa_generate_private_key(u_int bits, DSA **dsap)
1583: {
1584: DSA *private;
1585: int ret = SSH_ERR_INTERNAL_ERROR;
1586:
1.49 djm 1587: if (dsap == NULL)
1.1 djm 1588: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1589: if (bits != 1024)
1590: return SSH_ERR_KEY_LENGTH;
1.1 djm 1591: if ((private = DSA_new()) == NULL) {
1592: ret = SSH_ERR_ALLOC_FAIL;
1593: goto out;
1594: }
1595: *dsap = NULL;
1596: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1597: NULL, NULL) || !DSA_generate_key(private)) {
1598: ret = SSH_ERR_LIBCRYPTO_ERROR;
1599: goto out;
1600: }
1601: *dsap = private;
1602: private = NULL;
1603: ret = 0;
1604: out:
1.60 jsing 1605: DSA_free(private);
1.1 djm 1606: return ret;
1607: }
1608:
1609: int
1610: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1611: {
1612: EC_GROUP *eg;
1613: int nids[] = {
1614: NID_X9_62_prime256v1,
1615: NID_secp384r1,
1616: NID_secp521r1,
1617: -1
1618: };
1619: int nid;
1620: u_int i;
1621: const EC_GROUP *g = EC_KEY_get0_group(k);
1622:
1623: /*
1624: * The group may be stored in a ASN.1 encoded private key in one of two
1625: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1626: * or explicit group parameters encoded into the key blob. Only the
1627: * "named group" case sets the group NID for us, but we can figure
1628: * it out for the other case by comparing against all the groups that
1629: * are supported.
1630: */
1631: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1632: return nid;
1633: for (i = 0; nids[i] != -1; i++) {
1.93 djm 1634: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1.1 djm 1635: return -1;
1.93 djm 1636: if (EC_GROUP_cmp(g, eg, NULL) == 0)
1.1 djm 1637: break;
1638: EC_GROUP_free(eg);
1639: }
1640: if (nids[i] != -1) {
1641: /* Use the group with the NID attached */
1642: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1643: if (EC_KEY_set_group(k, eg) != 1) {
1644: EC_GROUP_free(eg);
1645: return -1;
1646: }
1647: }
1648: return nids[i];
1649: }
1650:
1651: static int
1652: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1653: {
1654: EC_KEY *private;
1655: int ret = SSH_ERR_INTERNAL_ERROR;
1656:
1.50 djm 1657: if (nid == NULL || ecdsap == NULL)
1.1 djm 1658: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1659: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1660: return SSH_ERR_KEY_LENGTH;
1.1 djm 1661: *ecdsap = NULL;
1662: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1663: ret = SSH_ERR_ALLOC_FAIL;
1664: goto out;
1665: }
1666: if (EC_KEY_generate_key(private) != 1) {
1667: ret = SSH_ERR_LIBCRYPTO_ERROR;
1668: goto out;
1669: }
1670: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1671: *ecdsap = private;
1672: private = NULL;
1673: ret = 0;
1674: out:
1.60 jsing 1675: EC_KEY_free(private);
1.1 djm 1676: return ret;
1677: }
1678: #endif /* WITH_OPENSSL */
1679:
1680: int
1681: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1682: {
1683: struct sshkey *k;
1684: int ret = SSH_ERR_INTERNAL_ERROR;
1685:
1686: if (keyp == NULL)
1687: return SSH_ERR_INVALID_ARGUMENT;
1688: *keyp = NULL;
1689: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1690: return SSH_ERR_ALLOC_FAIL;
1691: switch (type) {
1692: case KEY_ED25519:
1693: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1694: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1695: ret = SSH_ERR_ALLOC_FAIL;
1696: break;
1697: }
1698: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1699: ret = 0;
1700: break;
1.62 markus 1701: #ifdef WITH_XMSS
1702: case KEY_XMSS:
1703: ret = sshkey_xmss_generate_private_key(k, bits);
1704: break;
1705: #endif /* WITH_XMSS */
1.1 djm 1706: #ifdef WITH_OPENSSL
1707: case KEY_DSA:
1708: ret = dsa_generate_private_key(bits, &k->dsa);
1709: break;
1710: case KEY_ECDSA:
1711: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1712: &k->ecdsa);
1713: break;
1714: case KEY_RSA:
1715: ret = rsa_generate_private_key(bits, &k->rsa);
1716: break;
1717: #endif /* WITH_OPENSSL */
1718: default:
1719: ret = SSH_ERR_INVALID_ARGUMENT;
1720: }
1721: if (ret == 0) {
1722: k->type = type;
1723: *keyp = k;
1724: } else
1725: sshkey_free(k);
1726: return ret;
1727: }
1728:
1729: int
1730: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1731: {
1732: u_int i;
1733: const struct sshkey_cert *from;
1734: struct sshkey_cert *to;
1.67 djm 1735: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1736:
1.67 djm 1737: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1738: return SSH_ERR_INVALID_ARGUMENT;
1739:
1.67 djm 1740: if ((to = cert_new()) == NULL)
1.1 djm 1741: return SSH_ERR_ALLOC_FAIL;
1742:
1.67 djm 1743: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1744: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1745: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1746: goto out;
1.1 djm 1747:
1748: to->serial = from->serial;
1749: to->type = from->type;
1750: if (from->key_id == NULL)
1751: to->key_id = NULL;
1.67 djm 1752: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1753: r = SSH_ERR_ALLOC_FAIL;
1754: goto out;
1755: }
1.1 djm 1756: to->valid_after = from->valid_after;
1757: to->valid_before = from->valid_before;
1758: if (from->signature_key == NULL)
1759: to->signature_key = NULL;
1.67 djm 1760: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1761: &to->signature_key)) != 0)
1.67 djm 1762: goto out;
1763: if (from->signature_type != NULL &&
1764: (to->signature_type = strdup(from->signature_type)) == NULL) {
1765: r = SSH_ERR_ALLOC_FAIL;
1766: goto out;
1767: }
1768: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1769: r = SSH_ERR_INVALID_ARGUMENT;
1770: goto out;
1771: }
1.1 djm 1772: if (from->nprincipals > 0) {
1773: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1774: sizeof(*to->principals))) == NULL) {
1775: r = SSH_ERR_ALLOC_FAIL;
1776: goto out;
1777: }
1.1 djm 1778: for (i = 0; i < from->nprincipals; i++) {
1779: to->principals[i] = strdup(from->principals[i]);
1780: if (to->principals[i] == NULL) {
1781: to->nprincipals = i;
1.67 djm 1782: r = SSH_ERR_ALLOC_FAIL;
1783: goto out;
1.1 djm 1784: }
1785: }
1786: }
1787: to->nprincipals = from->nprincipals;
1.67 djm 1788:
1789: /* success */
1790: cert_free(to_key->cert);
1791: to_key->cert = to;
1792: to = NULL;
1793: r = 0;
1794: out:
1795: cert_free(to);
1796: return r;
1.1 djm 1797: }
1798:
1799: int
1800: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1801: {
1802: struct sshkey *n = NULL;
1.69 djm 1803: int r = SSH_ERR_INTERNAL_ERROR;
1804: #ifdef WITH_OPENSSL
1805: const BIGNUM *rsa_n, *rsa_e;
1806: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1807: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1808: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1809: BIGNUM *dsa_pub_key_dup = NULL;
1810: #endif /* WITH_OPENSSL */
1.1 djm 1811:
1.24 djm 1812: *pkp = NULL;
1.85 djm 1813: if ((n = sshkey_new(k->type)) == NULL) {
1814: r = SSH_ERR_ALLOC_FAIL;
1815: goto out;
1816: }
1.1 djm 1817: switch (k->type) {
1818: #ifdef WITH_OPENSSL
1819: case KEY_DSA:
1820: case KEY_DSA_CERT:
1.69 djm 1821: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1822: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1823: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1824: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1825: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1826: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1827: r = SSH_ERR_ALLOC_FAIL;
1828: goto out;
1829: }
1830: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1831: r = SSH_ERR_LIBCRYPTO_ERROR;
1832: goto out;
1.1 djm 1833: }
1.69 djm 1834: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1835: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1836: r = SSH_ERR_LIBCRYPTO_ERROR;
1837: goto out;
1838: }
1839: dsa_pub_key_dup = NULL; /* transferred */
1840:
1.1 djm 1841: break;
1842: case KEY_ECDSA:
1843: case KEY_ECDSA_CERT:
1.85 djm 1844: case KEY_ECDSA_SK:
1845: case KEY_ECDSA_SK_CERT:
1.1 djm 1846: n->ecdsa_nid = k->ecdsa_nid;
1847: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1848: if (n->ecdsa == NULL) {
1.69 djm 1849: r = SSH_ERR_ALLOC_FAIL;
1850: goto out;
1.1 djm 1851: }
1852: if (EC_KEY_set_public_key(n->ecdsa,
1853: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1854: r = SSH_ERR_LIBCRYPTO_ERROR;
1855: goto out;
1.1 djm 1856: }
1.85 djm 1857: if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT)
1858: break;
1859: /* Append security-key application string */
1860: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1861: goto out;
1.1 djm 1862: break;
1863: case KEY_RSA:
1864: case KEY_RSA_CERT:
1.69 djm 1865: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1866: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1867: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1868: r = SSH_ERR_ALLOC_FAIL;
1869: goto out;
1870: }
1871: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1872: r = SSH_ERR_LIBCRYPTO_ERROR;
1873: goto out;
1874: }
1875: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1876: break;
1877: #endif /* WITH_OPENSSL */
1878: case KEY_ED25519:
1879: case KEY_ED25519_CERT:
1.90 markus 1880: case KEY_ED25519_SK:
1881: case KEY_ED25519_SK_CERT:
1.1 djm 1882: if (k->ed25519_pk != NULL) {
1883: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1884: r = SSH_ERR_ALLOC_FAIL;
1885: goto out;
1.1 djm 1886: }
1887: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1888: }
1.90 markus 1889: if (k->type != KEY_ED25519_SK &&
1890: k->type != KEY_ED25519_SK_CERT)
1891: break;
1892: /* Append security-key application string */
1893: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1894: goto out;
1.1 djm 1895: break;
1.62 markus 1896: #ifdef WITH_XMSS
1897: case KEY_XMSS:
1898: case KEY_XMSS_CERT:
1.69 djm 1899: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1900: goto out;
1.62 markus 1901: if (k->xmss_pk != NULL) {
1.92 markus 1902: u_int32_t left;
1.62 markus 1903: size_t pklen = sshkey_xmss_pklen(k);
1904: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1905: r = SSH_ERR_INTERNAL_ERROR;
1906: goto out;
1.62 markus 1907: }
1908: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1909: r = SSH_ERR_ALLOC_FAIL;
1910: goto out;
1.62 markus 1911: }
1912: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1.92 markus 1913: /* simulate number of signatures left on pubkey */
1914: left = sshkey_xmss_signatures_left(k);
1915: if (left)
1916: sshkey_xmss_enable_maxsign(n, left);
1.62 markus 1917: }
1918: break;
1919: #endif /* WITH_XMSS */
1.1 djm 1920: default:
1.69 djm 1921: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1922: goto out;
1.1 djm 1923: }
1.69 djm 1924: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1925: goto out;
1926: /* success */
1.1 djm 1927: *pkp = n;
1.69 djm 1928: n = NULL;
1929: r = 0;
1930: out:
1931: sshkey_free(n);
1.83 djm 1932: #ifdef WITH_OPENSSL
1.69 djm 1933: BN_clear_free(rsa_n_dup);
1934: BN_clear_free(rsa_e_dup);
1935: BN_clear_free(dsa_p_dup);
1936: BN_clear_free(dsa_q_dup);
1937: BN_clear_free(dsa_g_dup);
1938: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1939: #endif /* WITH_OPENSSL */
1.69 djm 1940:
1941: return r;
1.1 djm 1942: }
1943:
1.76 djm 1944: int
1945: sshkey_is_shielded(struct sshkey *k)
1946: {
1947: return k != NULL && k->shielded_private != NULL;
1948: }
1949:
1950: int
1951: sshkey_shield_private(struct sshkey *k)
1952: {
1953: struct sshbuf *prvbuf = NULL;
1954: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1955: struct sshcipher_ctx *cctx = NULL;
1956: const struct sshcipher *cipher;
1957: size_t i, enclen = 0;
1958: struct sshkey *kswap = NULL, tmp;
1959: int r = SSH_ERR_INTERNAL_ERROR;
1960:
1961: #ifdef DEBUG_PK
1962: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1963: #endif
1964: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1965: r = SSH_ERR_INVALID_ARGUMENT;
1966: goto out;
1967: }
1968: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1969: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1970: r = SSH_ERR_INTERNAL_ERROR;
1971: goto out;
1972: }
1973:
1974: /* Prepare a random pre-key, and from it an ephemeral key */
1975: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1976: r = SSH_ERR_ALLOC_FAIL;
1977: goto out;
1978: }
1979: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1980: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1981: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1982: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1983: goto out;
1984: #ifdef DEBUG_PK
1985: fprintf(stderr, "%s: key+iv\n", __func__);
1986: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1987: stderr);
1988: #endif
1989: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1990: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1991: goto out;
1992:
1993: /* Serialise and encrypt the private key using the ephemeral key */
1994: if ((prvbuf = sshbuf_new()) == NULL) {
1995: r = SSH_ERR_ALLOC_FAIL;
1996: goto out;
1997: }
1998: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1999: goto out;
2000: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.91 markus 2001: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 2002: goto out;
2003: /* pad to cipher blocksize */
2004: i = 0;
2005: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
2006: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
2007: goto out;
2008: }
2009: #ifdef DEBUG_PK
2010: fprintf(stderr, "%s: serialised\n", __func__);
2011: sshbuf_dump(prvbuf, stderr);
2012: #endif
2013: /* encrypt */
2014: enclen = sshbuf_len(prvbuf);
2015: if ((enc = malloc(enclen)) == NULL) {
2016: r = SSH_ERR_ALLOC_FAIL;
2017: goto out;
2018: }
2019: if ((r = cipher_crypt(cctx, 0, enc,
2020: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
2021: goto out;
2022: #ifdef DEBUG_PK
2023: fprintf(stderr, "%s: encrypted\n", __func__);
2024: sshbuf_dump_data(enc, enclen, stderr);
2025: #endif
2026:
2027: /* Make a scrubbed, public-only copy of our private key argument */
2028: if ((r = sshkey_from_private(k, &kswap)) != 0)
2029: goto out;
2030:
2031: /* Swap the private key out (it will be destroyed below) */
2032: tmp = *kswap;
2033: *kswap = *k;
2034: *k = tmp;
2035:
2036: /* Insert the shielded key into our argument */
2037: k->shielded_private = enc;
2038: k->shielded_len = enclen;
2039: k->shield_prekey = prekey;
2040: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
2041: enc = prekey = NULL; /* transferred */
2042: enclen = 0;
2043:
2044: /* success */
2045: r = 0;
2046:
2047: out:
2048: /* XXX behaviour on error - invalidate original private key? */
2049: cipher_free(cctx);
2050: explicit_bzero(keyiv, sizeof(keyiv));
2051: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 2052: freezero(enc, enclen);
1.76 djm 2053: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
2054: sshkey_free(kswap);
2055: sshbuf_free(prvbuf);
2056: return r;
2057: }
2058:
2059: int
2060: sshkey_unshield_private(struct sshkey *k)
2061: {
2062: struct sshbuf *prvbuf = NULL;
2063: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
2064: struct sshcipher_ctx *cctx = NULL;
2065: const struct sshcipher *cipher;
2066: size_t i;
2067: struct sshkey *kswap = NULL, tmp;
2068: int r = SSH_ERR_INTERNAL_ERROR;
2069:
2070: #ifdef DEBUG_PK
2071: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
2072: #endif
2073: if (!sshkey_is_shielded(k))
2074: return 0; /* nothing to do */
2075:
2076: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
2077: r = SSH_ERR_INVALID_ARGUMENT;
2078: goto out;
2079: }
2080: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
2081: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
2082: r = SSH_ERR_INTERNAL_ERROR;
2083: goto out;
2084: }
2085: /* check size of shielded key blob */
2086: if (k->shielded_len < cipher_blocksize(cipher) ||
2087: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
2088: r = SSH_ERR_INVALID_FORMAT;
2089: goto out;
2090: }
2091:
2092: /* Calculate the ephemeral key from the prekey */
2093: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2094: k->shield_prekey, k->shield_prekey_len,
2095: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2096: goto out;
2097: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2098: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2099: goto out;
2100: #ifdef DEBUG_PK
2101: fprintf(stderr, "%s: key+iv\n", __func__);
2102: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2103: stderr);
2104: #endif
2105:
2106: /* Decrypt and parse the shielded private key using the ephemeral key */
2107: if ((prvbuf = sshbuf_new()) == NULL) {
2108: r = SSH_ERR_ALLOC_FAIL;
2109: goto out;
2110: }
2111: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2112: goto out;
2113: /* decrypt */
2114: #ifdef DEBUG_PK
2115: fprintf(stderr, "%s: encrypted\n", __func__);
2116: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2117: #endif
2118: if ((r = cipher_crypt(cctx, 0, cp,
2119: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2120: goto out;
2121: #ifdef DEBUG_PK
2122: fprintf(stderr, "%s: serialised\n", __func__);
2123: sshbuf_dump(prvbuf, stderr);
2124: #endif
2125: /* Parse private key */
2126: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2127: goto out;
2128: /* Check deterministic padding */
2129: i = 0;
2130: while (sshbuf_len(prvbuf)) {
2131: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2132: goto out;
2133: if (pad != (++i & 0xff)) {
2134: r = SSH_ERR_INVALID_FORMAT;
2135: goto out;
2136: }
2137: }
2138:
2139: /* Swap the parsed key back into place */
2140: tmp = *kswap;
2141: *kswap = *k;
2142: *k = tmp;
2143:
2144: /* success */
2145: r = 0;
2146:
2147: out:
2148: cipher_free(cctx);
2149: explicit_bzero(keyiv, sizeof(keyiv));
2150: explicit_bzero(&tmp, sizeof(tmp));
2151: sshkey_free(kswap);
2152: sshbuf_free(prvbuf);
2153: return r;
2154: }
2155:
1.1 djm 2156: static int
1.14 djm 2157: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2158: {
1.14 djm 2159: struct sshbuf *principals = NULL, *crit = NULL;
2160: struct sshbuf *exts = NULL, *ca = NULL;
2161: u_char *sig = NULL;
2162: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2163: int ret = SSH_ERR_INTERNAL_ERROR;
2164:
2165: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2166: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2167: return ret;
2168:
1.20 djm 2169: /* Parse body of certificate up to signature */
2170: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2171: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2172: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2173: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2174: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2175: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2176: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2177: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2178: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2179: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2180: /* XXX debug print error for ret */
2181: ret = SSH_ERR_INVALID_FORMAT;
2182: goto out;
2183: }
2184:
2185: /* Signature is left in the buffer so we can calculate this length */
2186: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2187:
2188: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2189: ret = SSH_ERR_INVALID_FORMAT;
2190: goto out;
2191: }
2192:
2193: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2194: key->cert->type != SSH2_CERT_TYPE_HOST) {
2195: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2196: goto out;
2197: }
2198:
1.4 djm 2199: /* Parse principals section */
2200: while (sshbuf_len(principals) > 0) {
2201: char *principal = NULL;
2202: char **oprincipals = NULL;
2203:
1.1 djm 2204: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2205: ret = SSH_ERR_INVALID_FORMAT;
2206: goto out;
2207: }
1.4 djm 2208: if ((ret = sshbuf_get_cstring(principals, &principal,
2209: NULL)) != 0) {
1.1 djm 2210: ret = SSH_ERR_INVALID_FORMAT;
2211: goto out;
2212: }
2213: oprincipals = key->cert->principals;
1.51 deraadt 2214: key->cert->principals = recallocarray(key->cert->principals,
2215: key->cert->nprincipals, key->cert->nprincipals + 1,
2216: sizeof(*key->cert->principals));
1.1 djm 2217: if (key->cert->principals == NULL) {
2218: free(principal);
2219: key->cert->principals = oprincipals;
2220: ret = SSH_ERR_ALLOC_FAIL;
2221: goto out;
2222: }
2223: key->cert->principals[key->cert->nprincipals++] = principal;
2224: }
2225:
1.4 djm 2226: /*
2227: * Stash a copies of the critical options and extensions sections
2228: * for later use.
2229: */
2230: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2231: (exts != NULL &&
2232: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2233: goto out;
2234:
1.4 djm 2235: /*
2236: * Validate critical options and extensions sections format.
2237: */
2238: while (sshbuf_len(crit) != 0) {
2239: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2240: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2241: sshbuf_reset(key->cert->critical);
1.1 djm 2242: ret = SSH_ERR_INVALID_FORMAT;
2243: goto out;
2244: }
2245: }
1.4 djm 2246: while (exts != NULL && sshbuf_len(exts) != 0) {
2247: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2248: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2249: sshbuf_reset(key->cert->extensions);
1.1 djm 2250: ret = SSH_ERR_INVALID_FORMAT;
2251: goto out;
2252: }
2253: }
2254:
1.4 djm 2255: /* Parse CA key and check signature */
1.14 djm 2256: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2257: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2258: goto out;
2259: }
2260: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2261: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2262: goto out;
2263: }
2264: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.96 djm 2265: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
1.1 djm 2266: goto out;
1.82 djm 2267: if ((ret = sshkey_get_sigtype(sig, slen,
2268: &key->cert->signature_type)) != 0)
1.67 djm 2269: goto out;
1.4 djm 2270:
2271: /* Success */
1.1 djm 2272: ret = 0;
2273: out:
1.14 djm 2274: sshbuf_free(ca);
1.4 djm 2275: sshbuf_free(crit);
2276: sshbuf_free(exts);
2277: sshbuf_free(principals);
1.1 djm 2278: free(sig);
2279: return ret;
2280: }
2281:
1.83 djm 2282: #ifdef WITH_OPENSSL
1.1 djm 2283: static int
1.69 djm 2284: check_rsa_length(const RSA *rsa)
2285: {
2286: const BIGNUM *rsa_n;
2287:
2288: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2289: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2290: return SSH_ERR_KEY_LENGTH;
2291: return 0;
2292: }
1.83 djm 2293: #endif /* WITH_OPENSSL */
1.69 djm 2294:
2295: static int
1.14 djm 2296: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2297: int allow_cert)
1.1 djm 2298: {
1.12 djm 2299: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2300: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2301: struct sshkey *key = NULL;
2302: size_t len;
2303: u_char *pk = NULL;
1.14 djm 2304: struct sshbuf *copy;
1.1 djm 2305: #ifdef WITH_OPENSSL
2306: EC_POINT *q = NULL;
1.69 djm 2307: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2308: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2309: #endif /* WITH_OPENSSL */
2310:
2311: #ifdef DEBUG_PK /* XXX */
1.14 djm 2312: sshbuf_dump(b, stderr);
1.1 djm 2313: #endif
1.32 djm 2314: if (keyp != NULL)
2315: *keyp = NULL;
1.14 djm 2316: if ((copy = sshbuf_fromb(b)) == NULL) {
2317: ret = SSH_ERR_ALLOC_FAIL;
2318: goto out;
2319: }
1.1 djm 2320: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2321: ret = SSH_ERR_INVALID_FORMAT;
2322: goto out;
2323: }
2324:
2325: type = sshkey_type_from_name(ktype);
2326: if (!allow_cert && sshkey_type_is_cert(type)) {
2327: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2328: goto out;
2329: }
2330: switch (type) {
2331: #ifdef WITH_OPENSSL
2332: case KEY_RSA_CERT:
1.14 djm 2333: /* Skip nonce */
1.1 djm 2334: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2335: ret = SSH_ERR_INVALID_FORMAT;
2336: goto out;
2337: }
2338: /* FALLTHROUGH */
2339: case KEY_RSA:
2340: if ((key = sshkey_new(type)) == NULL) {
2341: ret = SSH_ERR_ALLOC_FAIL;
2342: goto out;
2343: }
1.73 djm 2344: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2345: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2346: ret = SSH_ERR_INVALID_FORMAT;
2347: goto out;
2348: }
1.69 djm 2349: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2350: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2351: goto out;
2352: }
1.69 djm 2353: rsa_n = rsa_e = NULL; /* transferred */
2354: if ((ret = check_rsa_length(key->rsa)) != 0)
2355: goto out;
1.1 djm 2356: #ifdef DEBUG_PK
2357: RSA_print_fp(stderr, key->rsa, 8);
2358: #endif
2359: break;
2360: case KEY_DSA_CERT:
1.14 djm 2361: /* Skip nonce */
1.1 djm 2362: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2363: ret = SSH_ERR_INVALID_FORMAT;
2364: goto out;
2365: }
2366: /* FALLTHROUGH */
2367: case KEY_DSA:
2368: if ((key = sshkey_new(type)) == NULL) {
2369: ret = SSH_ERR_ALLOC_FAIL;
2370: goto out;
2371: }
1.73 djm 2372: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2373: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2374: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2375: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2376: ret = SSH_ERR_INVALID_FORMAT;
2377: goto out;
2378: }
1.69 djm 2379: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2380: ret = SSH_ERR_LIBCRYPTO_ERROR;
2381: goto out;
2382: }
2383: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2384: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2385: ret = SSH_ERR_LIBCRYPTO_ERROR;
2386: goto out;
2387: }
2388: dsa_pub_key = NULL; /* transferred */
1.1 djm 2389: #ifdef DEBUG_PK
2390: DSA_print_fp(stderr, key->dsa, 8);
2391: #endif
2392: break;
2393: case KEY_ECDSA_CERT:
1.85 djm 2394: case KEY_ECDSA_SK_CERT:
1.14 djm 2395: /* Skip nonce */
1.1 djm 2396: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2397: ret = SSH_ERR_INVALID_FORMAT;
2398: goto out;
2399: }
2400: /* FALLTHROUGH */
2401: case KEY_ECDSA:
1.85 djm 2402: case KEY_ECDSA_SK:
1.1 djm 2403: if ((key = sshkey_new(type)) == NULL) {
2404: ret = SSH_ERR_ALLOC_FAIL;
2405: goto out;
2406: }
1.12 djm 2407: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2408: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2409: ret = SSH_ERR_INVALID_FORMAT;
2410: goto out;
2411: }
2412: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2413: ret = SSH_ERR_EC_CURVE_MISMATCH;
2414: goto out;
2415: }
1.60 jsing 2416: EC_KEY_free(key->ecdsa);
1.1 djm 2417: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2418: == NULL) {
2419: ret = SSH_ERR_EC_CURVE_INVALID;
2420: goto out;
2421: }
2422: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2423: ret = SSH_ERR_ALLOC_FAIL;
2424: goto out;
2425: }
2426: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2427: ret = SSH_ERR_INVALID_FORMAT;
2428: goto out;
2429: }
2430: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2431: q) != 0) {
2432: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2433: goto out;
2434: }
2435: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2436: /* XXX assume it is a allocation error */
2437: ret = SSH_ERR_ALLOC_FAIL;
2438: goto out;
2439: }
2440: #ifdef DEBUG_PK
2441: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2442: #endif
1.85 djm 2443: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2444: /* Parse additional security-key application string */
2445: if (sshbuf_get_cstring(b, &key->sk_application,
2446: NULL) != 0) {
2447: ret = SSH_ERR_INVALID_FORMAT;
2448: goto out;
2449: }
2450: #ifdef DEBUG_PK
2451: fprintf(stderr, "App: %s\n", key->sk_application);
2452: #endif
2453: }
1.1 djm 2454: break;
2455: #endif /* WITH_OPENSSL */
2456: case KEY_ED25519_CERT:
1.90 markus 2457: case KEY_ED25519_SK_CERT:
1.14 djm 2458: /* Skip nonce */
1.1 djm 2459: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2460: ret = SSH_ERR_INVALID_FORMAT;
2461: goto out;
2462: }
2463: /* FALLTHROUGH */
2464: case KEY_ED25519:
1.90 markus 2465: case KEY_ED25519_SK:
1.1 djm 2466: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2467: goto out;
2468: if (len != ED25519_PK_SZ) {
2469: ret = SSH_ERR_INVALID_FORMAT;
2470: goto out;
2471: }
2472: if ((key = sshkey_new(type)) == NULL) {
2473: ret = SSH_ERR_ALLOC_FAIL;
2474: goto out;
2475: }
1.90 markus 2476: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2477: /* Parse additional security-key application string */
2478: if (sshbuf_get_cstring(b, &key->sk_application,
2479: NULL) != 0) {
2480: ret = SSH_ERR_INVALID_FORMAT;
2481: goto out;
2482: }
2483: #ifdef DEBUG_PK
2484: fprintf(stderr, "App: %s\n", key->sk_application);
2485: #endif
2486: }
1.1 djm 2487: key->ed25519_pk = pk;
2488: pk = NULL;
2489: break;
1.62 markus 2490: #ifdef WITH_XMSS
2491: case KEY_XMSS_CERT:
2492: /* Skip nonce */
2493: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2494: ret = SSH_ERR_INVALID_FORMAT;
2495: goto out;
2496: }
2497: /* FALLTHROUGH */
2498: case KEY_XMSS:
2499: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2500: goto out;
2501: if ((key = sshkey_new(type)) == NULL) {
2502: ret = SSH_ERR_ALLOC_FAIL;
2503: goto out;
2504: }
2505: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2506: goto out;
2507: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2508: goto out;
2509: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2510: ret = SSH_ERR_INVALID_FORMAT;
2511: goto out;
2512: }
2513: key->xmss_pk = pk;
2514: pk = NULL;
2515: if (type != KEY_XMSS_CERT &&
2516: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2517: goto out;
2518: break;
2519: #endif /* WITH_XMSS */
1.1 djm 2520: case KEY_UNSPEC:
2521: default:
2522: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2523: goto out;
2524: }
2525:
2526: /* Parse certificate potion */
1.14 djm 2527: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2528: goto out;
2529:
2530: if (key != NULL && sshbuf_len(b) != 0) {
2531: ret = SSH_ERR_INVALID_FORMAT;
2532: goto out;
2533: }
2534: ret = 0;
1.32 djm 2535: if (keyp != NULL) {
2536: *keyp = key;
2537: key = NULL;
2538: }
1.1 djm 2539: out:
1.14 djm 2540: sshbuf_free(copy);
1.1 djm 2541: sshkey_free(key);
1.62 markus 2542: free(xmss_name);
1.1 djm 2543: free(ktype);
2544: free(curve);
2545: free(pk);
2546: #ifdef WITH_OPENSSL
1.60 jsing 2547: EC_POINT_free(q);
1.69 djm 2548: BN_clear_free(rsa_n);
2549: BN_clear_free(rsa_e);
2550: BN_clear_free(dsa_p);
2551: BN_clear_free(dsa_q);
2552: BN_clear_free(dsa_g);
2553: BN_clear_free(dsa_pub_key);
1.1 djm 2554: #endif /* WITH_OPENSSL */
2555: return ret;
2556: }
2557:
2558: int
2559: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2560: {
1.14 djm 2561: struct sshbuf *b;
2562: int r;
2563:
2564: if ((b = sshbuf_from(blob, blen)) == NULL)
2565: return SSH_ERR_ALLOC_FAIL;
2566: r = sshkey_from_blob_internal(b, keyp, 1);
2567: sshbuf_free(b);
2568: return r;
2569: }
2570:
2571: int
2572: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2573: {
2574: return sshkey_from_blob_internal(b, keyp, 1);
2575: }
2576:
2577: int
2578: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2579: {
2580: struct sshbuf *b;
2581: int r;
2582:
2583: if ((r = sshbuf_froms(buf, &b)) != 0)
2584: return r;
2585: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2586: sshbuf_free(b);
2587: return r;
2588: }
2589:
1.82 djm 2590: int
2591: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2592: {
2593: int r;
2594: struct sshbuf *b = NULL;
2595: char *sigtype = NULL;
2596:
2597: if (sigtypep != NULL)
2598: *sigtypep = NULL;
2599: if ((b = sshbuf_from(sig, siglen)) == NULL)
2600: return SSH_ERR_ALLOC_FAIL;
2601: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2602: goto out;
2603: /* success */
2604: if (sigtypep != NULL) {
2605: *sigtypep = sigtype;
2606: sigtype = NULL;
2607: }
2608: r = 0;
2609: out:
2610: free(sigtype);
1.14 djm 2611: sshbuf_free(b);
2612: return r;
1.68 djm 2613: }
2614:
2615: /*
2616: *
2617: * Checks whether a certificate's signature type is allowed.
2618: * Returns 0 (success) if the certificate signature type appears in the
2619: * "allowed" pattern-list, or the key is not a certificate to begin with.
2620: * Otherwise returns a ssherr.h code.
2621: */
2622: int
2623: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2624: {
2625: if (key == NULL || allowed == NULL)
2626: return SSH_ERR_INVALID_ARGUMENT;
2627: if (!sshkey_type_is_cert(key->type))
2628: return 0;
2629: if (key->cert == NULL || key->cert->signature_type == NULL)
2630: return SSH_ERR_INVALID_ARGUMENT;
2631: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2632: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2633: return 0;
1.65 djm 2634: }
2635:
2636: /*
2637: * Returns the expected signature algorithm for a given public key algorithm.
2638: */
1.66 djm 2639: const char *
2640: sshkey_sigalg_by_name(const char *name)
1.65 djm 2641: {
2642: const struct keytype *kt;
2643:
2644: for (kt = keytypes; kt->type != -1; kt++) {
2645: if (strcmp(kt->name, name) != 0)
2646: continue;
2647: if (kt->sigalg != NULL)
2648: return kt->sigalg;
2649: if (!kt->cert)
2650: return kt->name;
2651: return sshkey_ssh_name_from_type_nid(
2652: sshkey_type_plain(kt->type), kt->nid);
2653: }
2654: return NULL;
2655: }
2656:
2657: /*
2658: * Verifies that the signature algorithm appearing inside the signature blob
2659: * matches that which was requested.
2660: */
2661: int
2662: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2663: const char *requested_alg)
2664: {
2665: const char *expected_alg;
2666: char *sigtype = NULL;
2667: int r;
2668:
2669: if (requested_alg == NULL)
2670: return 0;
1.66 djm 2671: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2672: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2673: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2674: return r;
2675: r = strcmp(expected_alg, sigtype) == 0;
2676: free(sigtype);
2677: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2678: }
2679:
2680: int
1.76 djm 2681: sshkey_sign(struct sshkey *key,
1.1 djm 2682: u_char **sigp, size_t *lenp,
1.86 djm 2683: const u_char *data, size_t datalen,
2684: const char *alg, const char *sk_provider, u_int compat)
1.1 djm 2685: {
1.76 djm 2686: int was_shielded = sshkey_is_shielded(key);
2687: int r2, r = SSH_ERR_INTERNAL_ERROR;
2688:
1.1 djm 2689: if (sigp != NULL)
2690: *sigp = NULL;
2691: if (lenp != NULL)
2692: *lenp = 0;
2693: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2694: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2695: if ((r = sshkey_unshield_private(key)) != 0)
2696: return r;
1.1 djm 2697: switch (key->type) {
2698: #ifdef WITH_OPENSSL
2699: case KEY_DSA_CERT:
2700: case KEY_DSA:
1.76 djm 2701: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2702: break;
1.1 djm 2703: case KEY_ECDSA_CERT:
2704: case KEY_ECDSA:
1.76 djm 2705: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2706: break;
1.1 djm 2707: case KEY_RSA_CERT:
2708: case KEY_RSA:
1.76 djm 2709: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2710: break;
1.1 djm 2711: #endif /* WITH_OPENSSL */
2712: case KEY_ED25519:
2713: case KEY_ED25519_CERT:
1.76 djm 2714: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2715: break;
2716: case KEY_ED25519_SK:
2717: case KEY_ED25519_SK_CERT:
1.97 ! djm 2718: case KEY_ECDSA_SK_CERT:
! 2719: case KEY_ECDSA_SK:
! 2720: r = sshsk_sign(sk_provider, key, sigp, lenp, data,
! 2721: datalen, compat);
1.76 djm 2722: break;
1.62 markus 2723: #ifdef WITH_XMSS
2724: case KEY_XMSS:
2725: case KEY_XMSS_CERT:
1.76 djm 2726: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2727: break;
1.62 markus 2728: #endif /* WITH_XMSS */
1.1 djm 2729: default:
1.76 djm 2730: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2731: break;
1.1 djm 2732: }
1.76 djm 2733: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2734: return r2;
2735: return r;
1.1 djm 2736: }
2737:
2738: /*
2739: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2740: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2741: */
2742: int
2743: sshkey_verify(const struct sshkey *key,
2744: const u_char *sig, size_t siglen,
1.96 djm 2745: const u_char *data, size_t dlen, const char *alg, u_int compat,
2746: struct sshkey_sig_details **detailsp)
1.1 djm 2747: {
1.96 djm 2748: if (detailsp != NULL)
2749: *detailsp = NULL;
1.6 djm 2750: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2751: return SSH_ERR_INVALID_ARGUMENT;
2752: switch (key->type) {
2753: #ifdef WITH_OPENSSL
2754: case KEY_DSA_CERT:
2755: case KEY_DSA:
2756: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2757: case KEY_ECDSA_CERT:
2758: case KEY_ECDSA:
2759: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2760: case KEY_ECDSA_SK_CERT:
2761: case KEY_ECDSA_SK:
2762: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2763: compat, detailsp);
1.1 djm 2764: case KEY_RSA_CERT:
2765: case KEY_RSA:
1.59 djm 2766: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2767: #endif /* WITH_OPENSSL */
2768: case KEY_ED25519:
2769: case KEY_ED25519_CERT:
2770: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2771: case KEY_ED25519_SK:
2772: case KEY_ED25519_SK_CERT:
2773: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
1.96 djm 2774: compat, detailsp);
1.62 markus 2775: #ifdef WITH_XMSS
2776: case KEY_XMSS:
2777: case KEY_XMSS_CERT:
2778: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2779: #endif /* WITH_XMSS */
1.1 djm 2780: default:
2781: return SSH_ERR_KEY_TYPE_UNKNOWN;
2782: }
2783: }
2784:
2785: /* Convert a plain key to their _CERT equivalent */
2786: int
1.20 djm 2787: sshkey_to_certified(struct sshkey *k)
1.1 djm 2788: {
2789: int newtype;
2790:
2791: switch (k->type) {
2792: #ifdef WITH_OPENSSL
2793: case KEY_RSA:
1.20 djm 2794: newtype = KEY_RSA_CERT;
1.1 djm 2795: break;
2796: case KEY_DSA:
1.20 djm 2797: newtype = KEY_DSA_CERT;
1.1 djm 2798: break;
2799: case KEY_ECDSA:
2800: newtype = KEY_ECDSA_CERT;
2801: break;
1.85 djm 2802: case KEY_ECDSA_SK:
2803: newtype = KEY_ECDSA_SK_CERT;
2804: break;
1.1 djm 2805: #endif /* WITH_OPENSSL */
1.90 markus 2806: case KEY_ED25519_SK:
2807: newtype = KEY_ED25519_SK_CERT;
2808: break;
1.1 djm 2809: case KEY_ED25519:
2810: newtype = KEY_ED25519_CERT;
2811: break;
1.62 markus 2812: #ifdef WITH_XMSS
2813: case KEY_XMSS:
2814: newtype = KEY_XMSS_CERT;
2815: break;
2816: #endif /* WITH_XMSS */
1.1 djm 2817: default:
2818: return SSH_ERR_INVALID_ARGUMENT;
2819: }
2820: if ((k->cert = cert_new()) == NULL)
2821: return SSH_ERR_ALLOC_FAIL;
2822: k->type = newtype;
2823: return 0;
2824: }
2825:
2826: /* Convert a certificate to its raw key equivalent */
2827: int
2828: sshkey_drop_cert(struct sshkey *k)
2829: {
2830: if (!sshkey_type_is_cert(k->type))
2831: return SSH_ERR_KEY_TYPE_UNKNOWN;
2832: cert_free(k->cert);
2833: k->cert = NULL;
2834: k->type = sshkey_type_plain(k->type);
2835: return 0;
2836: }
2837:
2838: /* Sign a certified key, (re-)generating the signed certblob. */
2839: int
1.53 djm 2840: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.86 djm 2841: const char *sk_provider, sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2842: {
2843: struct sshbuf *principals = NULL;
2844: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2845: size_t i, ca_len, sig_len;
2846: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2847: struct sshbuf *cert = NULL;
2848: char *sigtype = NULL;
1.69 djm 2849: #ifdef WITH_OPENSSL
2850: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2851: #endif /* WITH_OPENSSL */
1.1 djm 2852:
2853: if (k == NULL || k->cert == NULL ||
2854: k->cert->certblob == NULL || ca == NULL)
2855: return SSH_ERR_INVALID_ARGUMENT;
2856: if (!sshkey_is_cert(k))
2857: return SSH_ERR_KEY_TYPE_UNKNOWN;
2858: if (!sshkey_type_is_valid_ca(ca->type))
2859: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2860:
1.67 djm 2861: /*
2862: * If no alg specified as argument but a signature_type was set,
2863: * then prefer that. If both were specified, then they must match.
2864: */
2865: if (alg == NULL)
2866: alg = k->cert->signature_type;
2867: else if (k->cert->signature_type != NULL &&
2868: strcmp(alg, k->cert->signature_type) != 0)
2869: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2870:
2871: /*
2872: * If no signing algorithm or signature_type was specified and we're
2873: * using a RSA key, then default to a good signature algorithm.
2874: */
2875: if (alg == NULL && ca->type == KEY_RSA)
2876: alg = "rsa-sha2-512";
1.67 djm 2877:
1.1 djm 2878: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2879: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2880:
2881: cert = k->cert->certblob; /* for readability */
2882: sshbuf_reset(cert);
2883: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2884: goto out;
2885:
2886: /* -v01 certs put nonce first */
2887: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2888: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2889: goto out;
1.1 djm 2890:
2891: /* XXX this substantially duplicates to_blob(); refactor */
2892: switch (k->type) {
2893: #ifdef WITH_OPENSSL
2894: case KEY_DSA_CERT:
1.69 djm 2895: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2896: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2897: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2898: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2899: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2900: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2901: goto out;
2902: break;
2903: case KEY_ECDSA_CERT:
1.85 djm 2904: case KEY_ECDSA_SK_CERT:
1.1 djm 2905: if ((ret = sshbuf_put_cstring(cert,
2906: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2907: (ret = sshbuf_put_ec(cert,
2908: EC_KEY_get0_public_key(k->ecdsa),
2909: EC_KEY_get0_group(k->ecdsa))) != 0)
2910: goto out;
1.85 djm 2911: if (k->type == KEY_ECDSA_SK_CERT) {
2912: if ((ret = sshbuf_put_cstring(cert,
2913: k->sk_application)) != 0)
2914: goto out;
2915: }
1.1 djm 2916: break;
2917: case KEY_RSA_CERT:
1.69 djm 2918: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2919: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2920: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2921: goto out;
2922: break;
2923: #endif /* WITH_OPENSSL */
2924: case KEY_ED25519_CERT:
1.94 djm 2925: case KEY_ED25519_SK_CERT:
1.1 djm 2926: if ((ret = sshbuf_put_string(cert,
2927: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2928: goto out;
1.94 djm 2929: if (k->type == KEY_ED25519_SK_CERT) {
2930: if ((ret = sshbuf_put_cstring(cert,
2931: k->sk_application)) != 0)
2932: goto out;
2933: }
1.1 djm 2934: break;
1.62 markus 2935: #ifdef WITH_XMSS
2936: case KEY_XMSS_CERT:
2937: if (k->xmss_name == NULL) {
2938: ret = SSH_ERR_INVALID_ARGUMENT;
2939: goto out;
2940: }
2941: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2942: (ret = sshbuf_put_string(cert,
2943: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2944: goto out;
2945: break;
2946: #endif /* WITH_XMSS */
1.1 djm 2947: default:
2948: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2949: goto out;
1.1 djm 2950: }
2951:
1.20 djm 2952: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2953: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2954: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2955: goto out;
2956:
2957: if ((principals = sshbuf_new()) == NULL) {
2958: ret = SSH_ERR_ALLOC_FAIL;
2959: goto out;
2960: }
2961: for (i = 0; i < k->cert->nprincipals; i++) {
2962: if ((ret = sshbuf_put_cstring(principals,
2963: k->cert->principals[i])) != 0)
2964: goto out;
2965: }
2966: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2967: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2968: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2969: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2970: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2971: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2972: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2973: goto out;
2974:
2975: /* Sign the whole mess */
1.53 djm 2976: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.86 djm 2977: sshbuf_len(cert), alg, sk_provider, 0, signer_ctx)) != 0)
1.1 djm 2978: goto out;
1.67 djm 2979: /* Check and update signature_type against what was actually used */
1.82 djm 2980: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2981: goto out;
2982: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2983: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2984: goto out;
2985: }
2986: if (k->cert->signature_type == NULL) {
2987: k->cert->signature_type = sigtype;
2988: sigtype = NULL;
2989: }
1.1 djm 2990: /* Append signature and we are done */
2991: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2992: goto out;
2993: ret = 0;
2994: out:
2995: if (ret != 0)
2996: sshbuf_reset(cert);
1.29 mmcc 2997: free(sig_blob);
2998: free(ca_blob);
1.67 djm 2999: free(sigtype);
1.31 mmcc 3000: sshbuf_free(principals);
1.1 djm 3001: return ret;
1.53 djm 3002: }
3003:
3004: static int
1.76 djm 3005: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 3006: const u_char *data, size_t datalen,
1.86 djm 3007: const char *alg, const char *sk_provider, u_int compat, void *ctx)
1.53 djm 3008: {
3009: if (ctx != NULL)
3010: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 3011: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
3012: sk_provider, compat);
1.53 djm 3013: }
3014:
3015: int
1.86 djm 3016: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
3017: const char *sk_provider)
1.53 djm 3018: {
1.86 djm 3019: return sshkey_certify_custom(k, ca, alg, sk_provider,
3020: default_key_sign, NULL);
1.1 djm 3021: }
3022:
3023: int
3024: sshkey_cert_check_authority(const struct sshkey *k,
3025: int want_host, int require_principal,
3026: const char *name, const char **reason)
3027: {
3028: u_int i, principal_matches;
3029: time_t now = time(NULL);
3030:
3031: if (reason != NULL)
3032: *reason = NULL;
3033:
3034: if (want_host) {
3035: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
3036: *reason = "Certificate invalid: not a host certificate";
3037: return SSH_ERR_KEY_CERT_INVALID;
3038: }
3039: } else {
3040: if (k->cert->type != SSH2_CERT_TYPE_USER) {
3041: *reason = "Certificate invalid: not a user certificate";
3042: return SSH_ERR_KEY_CERT_INVALID;
3043: }
3044: }
3045: if (now < 0) {
3046: /* yikes - system clock before epoch! */
3047: *reason = "Certificate invalid: not yet valid";
3048: return SSH_ERR_KEY_CERT_INVALID;
3049: }
3050: if ((u_int64_t)now < k->cert->valid_after) {
3051: *reason = "Certificate invalid: not yet valid";
3052: return SSH_ERR_KEY_CERT_INVALID;
3053: }
3054: if ((u_int64_t)now >= k->cert->valid_before) {
3055: *reason = "Certificate invalid: expired";
3056: return SSH_ERR_KEY_CERT_INVALID;
3057: }
3058: if (k->cert->nprincipals == 0) {
3059: if (require_principal) {
3060: *reason = "Certificate lacks principal list";
3061: return SSH_ERR_KEY_CERT_INVALID;
3062: }
3063: } else if (name != NULL) {
3064: principal_matches = 0;
3065: for (i = 0; i < k->cert->nprincipals; i++) {
3066: if (strcmp(name, k->cert->principals[i]) == 0) {
3067: principal_matches = 1;
3068: break;
3069: }
3070: }
3071: if (!principal_matches) {
3072: *reason = "Certificate invalid: name is not a listed "
3073: "principal";
3074: return SSH_ERR_KEY_CERT_INVALID;
3075: }
3076: }
3077: return 0;
1.27 djm 3078: }
3079:
3080: size_t
3081: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
3082: {
3083: char from[32], to[32], ret[64];
3084: time_t tt;
3085: struct tm *tm;
3086:
3087: *from = *to = '\0';
3088: if (cert->valid_after == 0 &&
3089: cert->valid_before == 0xffffffffffffffffULL)
3090: return strlcpy(s, "forever", l);
3091:
3092: if (cert->valid_after != 0) {
3093: /* XXX revisit INT_MAX in 2038 :) */
3094: tt = cert->valid_after > INT_MAX ?
3095: INT_MAX : cert->valid_after;
3096: tm = localtime(&tt);
3097: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
3098: }
3099: if (cert->valid_before != 0xffffffffffffffffULL) {
3100: /* XXX revisit INT_MAX in 2038 :) */
3101: tt = cert->valid_before > INT_MAX ?
3102: INT_MAX : cert->valid_before;
3103: tm = localtime(&tt);
3104: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
3105: }
3106:
3107: if (cert->valid_after == 0)
3108: snprintf(ret, sizeof(ret), "before %s", to);
3109: else if (cert->valid_before == 0xffffffffffffffffULL)
3110: snprintf(ret, sizeof(ret), "after %s", from);
3111: else
3112: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
3113:
3114: return strlcpy(s, ret, l);
1.1 djm 3115: }
3116:
3117: int
1.76 djm 3118: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 3119: enum sshkey_serialize_rep opts)
1.1 djm 3120: {
3121: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 3122: int was_shielded = sshkey_is_shielded(key);
3123: struct sshbuf *b = NULL;
1.69 djm 3124: #ifdef WITH_OPENSSL
3125: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
3126: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
3127: #endif /* WITH_OPENSSL */
1.1 djm 3128:
1.76 djm 3129: if ((r = sshkey_unshield_private(key)) != 0)
3130: return r;
3131: if ((b = sshbuf_new()) == NULL)
3132: return SSH_ERR_ALLOC_FAIL;
1.1 djm 3133: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
3134: goto out;
3135: switch (key->type) {
3136: #ifdef WITH_OPENSSL
3137: case KEY_RSA:
1.69 djm 3138: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
3139: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3140: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
3141: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
3142: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
3143: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3144: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3145: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3146: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3147: goto out;
3148: break;
3149: case KEY_RSA_CERT:
3150: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3151: r = SSH_ERR_INVALID_ARGUMENT;
3152: goto out;
3153: }
1.69 djm 3154: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
3155: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3156: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 3157: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3158: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3159: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3160: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3161: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3162: goto out;
3163: break;
3164: case KEY_DSA:
1.69 djm 3165: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
3166: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
3167: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
3168: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
3169: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
3170: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3171: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3172: goto out;
3173: break;
3174: case KEY_DSA_CERT:
3175: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3176: r = SSH_ERR_INVALID_ARGUMENT;
3177: goto out;
3178: }
1.69 djm 3179: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3180: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3181: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3182: goto out;
3183: break;
3184: case KEY_ECDSA:
3185: if ((r = sshbuf_put_cstring(b,
3186: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3187: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3188: (r = sshbuf_put_bignum2(b,
3189: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3190: goto out;
3191: break;
3192: case KEY_ECDSA_CERT:
3193: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3194: r = SSH_ERR_INVALID_ARGUMENT;
3195: goto out;
3196: }
3197: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3198: (r = sshbuf_put_bignum2(b,
3199: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3200: goto out;
3201: break;
1.85 djm 3202: case KEY_ECDSA_SK:
3203: if ((r = sshbuf_put_cstring(b,
3204: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3205: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3206: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3207: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3208: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3209: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3210: goto out;
3211: break;
3212: case KEY_ECDSA_SK_CERT:
3213: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3214: r = SSH_ERR_INVALID_ARGUMENT;
3215: goto out;
3216: }
3217: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3218: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3219: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3220: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3221: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3222: goto out;
3223: break;
1.1 djm 3224: #endif /* WITH_OPENSSL */
3225: case KEY_ED25519:
3226: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3227: ED25519_PK_SZ)) != 0 ||
3228: (r = sshbuf_put_string(b, key->ed25519_sk,
3229: ED25519_SK_SZ)) != 0)
3230: goto out;
3231: break;
3232: case KEY_ED25519_CERT:
3233: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3234: r = SSH_ERR_INVALID_ARGUMENT;
3235: goto out;
3236: }
3237: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3238: (r = sshbuf_put_string(b, key->ed25519_pk,
3239: ED25519_PK_SZ)) != 0 ||
3240: (r = sshbuf_put_string(b, key->ed25519_sk,
3241: ED25519_SK_SZ)) != 0)
3242: goto out;
3243: break;
1.90 markus 3244: case KEY_ED25519_SK:
3245: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3246: ED25519_PK_SZ)) != 0 ||
3247: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3248: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3249: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3250: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3251: goto out;
3252: break;
3253: case KEY_ED25519_SK_CERT:
3254: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3255: r = SSH_ERR_INVALID_ARGUMENT;
3256: goto out;
3257: }
3258: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3259: (r = sshbuf_put_string(b, key->ed25519_pk,
3260: ED25519_PK_SZ)) != 0 ||
3261: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3262: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3263: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3264: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3265: goto out;
3266: break;
1.62 markus 3267: #ifdef WITH_XMSS
3268: case KEY_XMSS:
3269: if (key->xmss_name == NULL) {
3270: r = SSH_ERR_INVALID_ARGUMENT;
3271: goto out;
3272: }
3273: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3274: (r = sshbuf_put_string(b, key->xmss_pk,
3275: sshkey_xmss_pklen(key))) != 0 ||
3276: (r = sshbuf_put_string(b, key->xmss_sk,
3277: sshkey_xmss_sklen(key))) != 0 ||
3278: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3279: goto out;
3280: break;
3281: case KEY_XMSS_CERT:
3282: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3283: key->xmss_name == NULL) {
3284: r = SSH_ERR_INVALID_ARGUMENT;
3285: goto out;
3286: }
3287: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3288: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3289: (r = sshbuf_put_string(b, key->xmss_pk,
3290: sshkey_xmss_pklen(key))) != 0 ||
3291: (r = sshbuf_put_string(b, key->xmss_sk,
3292: sshkey_xmss_sklen(key))) != 0 ||
3293: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3294: goto out;
3295: break;
3296: #endif /* WITH_XMSS */
1.1 djm 3297: default:
3298: r = SSH_ERR_INVALID_ARGUMENT;
3299: goto out;
3300: }
1.76 djm 3301: /*
3302: * success (but we still need to append the output to buf after
3303: * possibly re-shielding the private key)
3304: */
1.1 djm 3305: r = 0;
3306: out:
1.76 djm 3307: if (was_shielded)
3308: r = sshkey_shield_private(key);
3309: if (r == 0)
3310: r = sshbuf_putb(buf, b);
3311: sshbuf_free(b);
3312:
1.1 djm 3313: return r;
3314: }
3315:
3316: int
1.76 djm 3317: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3318: {
3319: return sshkey_private_serialize_opt(key, b,
3320: SSHKEY_SERIALIZE_DEFAULT);
3321: }
3322:
3323: int
1.1 djm 3324: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3325: {
1.62 markus 3326: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3327: struct sshkey *k = NULL;
1.14 djm 3328: size_t pklen = 0, sklen = 0;
1.1 djm 3329: int type, r = SSH_ERR_INTERNAL_ERROR;
3330: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3331: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3332: #ifdef WITH_OPENSSL
3333: BIGNUM *exponent = NULL;
1.69 djm 3334: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3335: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3336: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3337: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3338: #endif /* WITH_OPENSSL */
3339:
3340: if (kp != NULL)
3341: *kp = NULL;
3342: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3343: goto out;
3344: type = sshkey_type_from_name(tname);
3345: switch (type) {
3346: #ifdef WITH_OPENSSL
3347: case KEY_DSA:
1.70 djm 3348: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3349: r = SSH_ERR_ALLOC_FAIL;
3350: goto out;
3351: }
1.73 djm 3352: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3353: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3354: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3355: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3356: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3357: goto out;
3358: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3359: r = SSH_ERR_LIBCRYPTO_ERROR;
3360: goto out;
3361: }
3362: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3363: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3364: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3365: goto out;
1.69 djm 3366: }
3367: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3368: break;
3369: case KEY_DSA_CERT:
1.14 djm 3370: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3371: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3372: goto out;
1.84 djm 3373: if (k->type != type) {
3374: r = SSH_ERR_INVALID_FORMAT;
3375: goto out;
3376: }
1.69 djm 3377: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3378: r = SSH_ERR_LIBCRYPTO_ERROR;
3379: goto out;
3380: }
3381: dsa_priv_key = NULL; /* transferred */
1.1 djm 3382: break;
3383: case KEY_ECDSA:
1.70 djm 3384: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3385: r = SSH_ERR_ALLOC_FAIL;
3386: goto out;
3387: }
3388: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3389: r = SSH_ERR_INVALID_ARGUMENT;
3390: goto out;
3391: }
3392: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3393: goto out;
3394: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3395: r = SSH_ERR_EC_CURVE_MISMATCH;
3396: goto out;
3397: }
3398: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3399: if (k->ecdsa == NULL) {
1.1 djm 3400: r = SSH_ERR_LIBCRYPTO_ERROR;
3401: goto out;
3402: }
3403: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3404: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3405: goto out;
3406: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3407: r = SSH_ERR_LIBCRYPTO_ERROR;
3408: goto out;
3409: }
3410: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3411: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3412: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3413: goto out;
3414: break;
3415: case KEY_ECDSA_CERT:
1.14 djm 3416: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3417: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3418: goto out;
1.84 djm 3419: if (k->type != type ||
3420: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
3421: r = SSH_ERR_INVALID_FORMAT;
3422: goto out;
3423: }
1.1 djm 3424: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3425: r = SSH_ERR_LIBCRYPTO_ERROR;
3426: goto out;
3427: }
3428: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3429: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3430: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3431: goto out;
3432: break;
1.85 djm 3433: case KEY_ECDSA_SK:
3434: if ((k = sshkey_new(type)) == NULL) {
3435: r = SSH_ERR_ALLOC_FAIL;
3436: goto out;
3437: }
3438: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3439: r = SSH_ERR_INVALID_ARGUMENT;
3440: goto out;
3441: }
3442: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3443: goto out;
3444: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3445: r = SSH_ERR_EC_CURVE_MISMATCH;
3446: goto out;
3447: }
3448: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3449: (k->sk_reserved = sshbuf_new()) == NULL) {
3450: r = SSH_ERR_ALLOC_FAIL;
3451: goto out;
3452: }
3453: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3454: if (k->ecdsa == NULL) {
3455: r = SSH_ERR_LIBCRYPTO_ERROR;
3456: goto out;
3457: }
3458: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3459: (r = sshbuf_get_cstring(buf, &k->sk_application,
3460: NULL)) != 0 ||
3461: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3462: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3463: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3464: goto out;
3465: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3466: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3467: goto out;
3468: break;
3469: case KEY_ECDSA_SK_CERT:
3470: if ((r = sshkey_froms(buf, &k)) != 0)
3471: goto out;
3472: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3473: (k->sk_reserved = sshbuf_new()) == NULL) {
3474: r = SSH_ERR_ALLOC_FAIL;
3475: goto out;
3476: }
3477: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3478: NULL)) != 0 ||
3479: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3480: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3481: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3482: goto out;
3483: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3484: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3485: goto out;
3486: break;
1.1 djm 3487: case KEY_RSA:
1.70 djm 3488: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3489: r = SSH_ERR_ALLOC_FAIL;
3490: goto out;
3491: }
1.73 djm 3492: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3493: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3494: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3495: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3496: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3497: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3498: goto out;
1.69 djm 3499: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3500: r = SSH_ERR_LIBCRYPTO_ERROR;
3501: goto out;
3502: }
3503: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3504: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3505: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3506: goto out;
3507: }
1.69 djm 3508: rsa_p = rsa_q = NULL; /* transferred */
3509: if ((r = check_rsa_length(k->rsa)) != 0)
3510: goto out;
3511: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3512: goto out;
1.1 djm 3513: break;
3514: case KEY_RSA_CERT:
1.14 djm 3515: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3516: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3517: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3518: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3519: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3520: goto out;
1.84 djm 3521: if (k->type != type) {
3522: r = SSH_ERR_INVALID_FORMAT;
3523: goto out;
3524: }
1.69 djm 3525: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3526: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3527: goto out;
3528: }
1.69 djm 3529: rsa_d = NULL; /* transferred */
3530: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3531: r = SSH_ERR_LIBCRYPTO_ERROR;
3532: goto out;
3533: }
3534: rsa_p = rsa_q = NULL; /* transferred */
3535: if ((r = check_rsa_length(k->rsa)) != 0)
3536: goto out;
3537: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3538: goto out;
1.1 djm 3539: break;
3540: #endif /* WITH_OPENSSL */
3541: case KEY_ED25519:
1.70 djm 3542: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3543: r = SSH_ERR_ALLOC_FAIL;
3544: goto out;
3545: }
3546: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3547: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3548: goto out;
3549: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3550: r = SSH_ERR_INVALID_FORMAT;
3551: goto out;
3552: }
3553: k->ed25519_pk = ed25519_pk;
3554: k->ed25519_sk = ed25519_sk;
3555: ed25519_pk = ed25519_sk = NULL;
3556: break;
3557: case KEY_ED25519_CERT:
1.14 djm 3558: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3559: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3560: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3561: goto out;
1.84 djm 3562: if (k->type != type) {
3563: r = SSH_ERR_INVALID_FORMAT;
3564: goto out;
3565: }
1.1 djm 3566: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3567: r = SSH_ERR_INVALID_FORMAT;
3568: goto out;
3569: }
3570: k->ed25519_pk = ed25519_pk;
3571: k->ed25519_sk = ed25519_sk;
1.84 djm 3572: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3573: break;
1.90 markus 3574: case KEY_ED25519_SK:
3575: if ((k = sshkey_new(type)) == NULL) {
3576: r = SSH_ERR_ALLOC_FAIL;
3577: goto out;
3578: }
3579: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3580: goto out;
3581: if (pklen != ED25519_PK_SZ) {
3582: r = SSH_ERR_INVALID_FORMAT;
3583: goto out;
3584: }
3585: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3586: (k->sk_reserved = sshbuf_new()) == NULL) {
3587: r = SSH_ERR_ALLOC_FAIL;
3588: goto out;
3589: }
3590: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3591: NULL)) != 0 ||
3592: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3593: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3594: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3595: goto out;
3596: k->ed25519_pk = ed25519_pk;
3597: ed25519_pk = NULL;
3598: break;
3599: case KEY_ED25519_SK_CERT:
3600: if ((r = sshkey_froms(buf, &k)) != 0 ||
3601: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3602: goto out;
3603: if (k->type != type) {
3604: r = SSH_ERR_INVALID_FORMAT;
3605: goto out;
3606: }
3607: if (pklen != ED25519_PK_SZ) {
3608: r = SSH_ERR_INVALID_FORMAT;
3609: goto out;
3610: }
3611: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3612: (k->sk_reserved = sshbuf_new()) == NULL) {
3613: r = SSH_ERR_ALLOC_FAIL;
3614: goto out;
3615: }
3616: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3617: NULL)) != 0 ||
3618: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3619: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3620: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3621: goto out;
3622: k->ed25519_pk = ed25519_pk;
3623: ed25519_pk = NULL; /* transferred */
3624: break;
1.62 markus 3625: #ifdef WITH_XMSS
3626: case KEY_XMSS:
1.70 djm 3627: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3628: r = SSH_ERR_ALLOC_FAIL;
3629: goto out;
3630: }
3631: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3632: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3633: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3634: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3635: goto out;
3636: if (pklen != sshkey_xmss_pklen(k) ||
3637: sklen != sshkey_xmss_sklen(k)) {
3638: r = SSH_ERR_INVALID_FORMAT;
3639: goto out;
3640: }
3641: k->xmss_pk = xmss_pk;
3642: k->xmss_sk = xmss_sk;
3643: xmss_pk = xmss_sk = NULL;
3644: /* optional internal state */
3645: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3646: goto out;
3647: break;
3648: case KEY_XMSS_CERT:
3649: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3650: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3651: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3652: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3653: goto out;
1.84 djm 3654: if (k->type != type || strcmp(xmss_name, k->xmss_name) != 0) {
1.64 markus 3655: r = SSH_ERR_INVALID_FORMAT;
3656: goto out;
3657: }
1.62 markus 3658: if (pklen != sshkey_xmss_pklen(k) ||
3659: sklen != sshkey_xmss_sklen(k)) {
3660: r = SSH_ERR_INVALID_FORMAT;
3661: goto out;
3662: }
3663: k->xmss_pk = xmss_pk;
3664: k->xmss_sk = xmss_sk;
3665: xmss_pk = xmss_sk = NULL;
3666: /* optional internal state */
3667: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3668: goto out;
3669: break;
3670: #endif /* WITH_XMSS */
1.1 djm 3671: default:
3672: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3673: goto out;
3674: }
3675: #ifdef WITH_OPENSSL
3676: /* enable blinding */
3677: switch (k->type) {
3678: case KEY_RSA:
3679: case KEY_RSA_CERT:
3680: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3681: r = SSH_ERR_LIBCRYPTO_ERROR;
3682: goto out;
3683: }
3684: break;
3685: }
3686: #endif /* WITH_OPENSSL */
3687: /* success */
3688: r = 0;
3689: if (kp != NULL) {
3690: *kp = k;
3691: k = NULL;
3692: }
3693: out:
3694: free(tname);
3695: free(curve);
3696: #ifdef WITH_OPENSSL
1.60 jsing 3697: BN_clear_free(exponent);
1.69 djm 3698: BN_clear_free(dsa_p);
3699: BN_clear_free(dsa_q);
3700: BN_clear_free(dsa_g);
3701: BN_clear_free(dsa_pub_key);
3702: BN_clear_free(dsa_priv_key);
3703: BN_clear_free(rsa_n);
3704: BN_clear_free(rsa_e);
3705: BN_clear_free(rsa_d);
3706: BN_clear_free(rsa_p);
3707: BN_clear_free(rsa_q);
3708: BN_clear_free(rsa_iqmp);
1.1 djm 3709: #endif /* WITH_OPENSSL */
3710: sshkey_free(k);
1.61 jsing 3711: freezero(ed25519_pk, pklen);
3712: freezero(ed25519_sk, sklen);
1.62 markus 3713: free(xmss_name);
3714: freezero(xmss_pk, pklen);
3715: freezero(xmss_sk, sklen);
1.1 djm 3716: return r;
3717: }
3718:
3719: #ifdef WITH_OPENSSL
3720: int
3721: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3722: {
3723: EC_POINT *nq = NULL;
1.93 djm 3724: BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
1.1 djm 3725: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3726:
3727: /*
3728: * NB. This assumes OpenSSL has already verified that the public
3729: * point lies on the curve. This is done by EC_POINT_oct2point()
3730: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3731: * reachable with public points not unmarshalled using
3732: * EC_POINT_oct2point then the caller will need to explicitly check.
3733: */
1.1 djm 3734:
3735: /*
3736: * We shouldn't ever hit this case because bignum_get_ecpoint()
3737: * refuses to load GF2m points.
3738: */
3739: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3740: NID_X9_62_prime_field)
3741: goto out;
3742:
3743: /* Q != infinity */
3744: if (EC_POINT_is_at_infinity(group, public))
3745: goto out;
3746:
1.93 djm 3747: if ((x = BN_new()) == NULL ||
3748: (y = BN_new()) == NULL ||
3749: (order = BN_new()) == NULL ||
3750: (tmp = BN_new()) == NULL) {
1.1 djm 3751: ret = SSH_ERR_ALLOC_FAIL;
3752: goto out;
3753: }
3754:
3755: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
1.93 djm 3756: if (EC_GROUP_get_order(group, order, NULL) != 1 ||
1.1 djm 3757: EC_POINT_get_affine_coordinates_GFp(group, public,
1.93 djm 3758: x, y, NULL) != 1) {
1.1 djm 3759: ret = SSH_ERR_LIBCRYPTO_ERROR;
3760: goto out;
3761: }
3762: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3763: BN_num_bits(y) <= BN_num_bits(order) / 2)
3764: goto out;
3765:
3766: /* nQ == infinity (n == order of subgroup) */
3767: if ((nq = EC_POINT_new(group)) == NULL) {
3768: ret = SSH_ERR_ALLOC_FAIL;
3769: goto out;
3770: }
1.93 djm 3771: if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
1.1 djm 3772: ret = SSH_ERR_LIBCRYPTO_ERROR;
3773: goto out;
3774: }
3775: if (EC_POINT_is_at_infinity(group, nq) != 1)
3776: goto out;
3777:
3778: /* x < order - 1, y < order - 1 */
3779: if (!BN_sub(tmp, order, BN_value_one())) {
3780: ret = SSH_ERR_LIBCRYPTO_ERROR;
3781: goto out;
3782: }
3783: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3784: goto out;
3785: ret = 0;
3786: out:
1.93 djm 3787: BN_clear_free(x);
3788: BN_clear_free(y);
3789: BN_clear_free(order);
3790: BN_clear_free(tmp);
1.60 jsing 3791: EC_POINT_free(nq);
1.1 djm 3792: return ret;
3793: }
3794:
3795: int
3796: sshkey_ec_validate_private(const EC_KEY *key)
3797: {
1.93 djm 3798: BIGNUM *order = NULL, *tmp = NULL;
1.1 djm 3799: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3800:
1.93 djm 3801: if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
1.1 djm 3802: ret = SSH_ERR_ALLOC_FAIL;
3803: goto out;
3804: }
3805:
3806: /* log2(private) > log2(order)/2 */
1.93 djm 3807: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
1.1 djm 3808: ret = SSH_ERR_LIBCRYPTO_ERROR;
3809: goto out;
3810: }
3811: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3812: BN_num_bits(order) / 2)
3813: goto out;
3814:
3815: /* private < order - 1 */
3816: if (!BN_sub(tmp, order, BN_value_one())) {
3817: ret = SSH_ERR_LIBCRYPTO_ERROR;
3818: goto out;
3819: }
3820: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3821: goto out;
3822: ret = 0;
3823: out:
1.93 djm 3824: BN_clear_free(order);
3825: BN_clear_free(tmp);
1.1 djm 3826: return ret;
3827: }
3828:
3829: void
3830: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3831: {
1.93 djm 3832: BIGNUM *x = NULL, *y = NULL;
1.1 djm 3833:
3834: if (point == NULL) {
3835: fputs("point=(NULL)\n", stderr);
3836: return;
3837: }
1.93 djm 3838: if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
3839: fprintf(stderr, "%s: BN_new failed\n", __func__);
3840: goto out;
1.1 djm 3841: }
3842: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3843: NID_X9_62_prime_field) {
3844: fprintf(stderr, "%s: group is not a prime field\n", __func__);
1.93 djm 3845: goto out;
1.1 djm 3846: }
1.93 djm 3847: if (EC_POINT_get_affine_coordinates_GFp(group, point,
3848: x, y, NULL) != 1) {
1.1 djm 3849: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3850: __func__);
1.93 djm 3851: goto out;
1.1 djm 3852: }
3853: fputs("x=", stderr);
3854: BN_print_fp(stderr, x);
3855: fputs("\ny=", stderr);
3856: BN_print_fp(stderr, y);
3857: fputs("\n", stderr);
1.93 djm 3858: out:
3859: BN_clear_free(x);
3860: BN_clear_free(y);
1.1 djm 3861: }
3862:
3863: void
3864: sshkey_dump_ec_key(const EC_KEY *key)
3865: {
3866: const BIGNUM *exponent;
3867:
3868: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3869: EC_KEY_get0_public_key(key));
3870: fputs("exponent=", stderr);
3871: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3872: fputs("(NULL)", stderr);
3873: else
3874: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3875: fputs("\n", stderr);
3876: }
3877: #endif /* WITH_OPENSSL */
3878:
3879: static int
1.76 djm 3880: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3881: const char *passphrase, const char *comment, const char *ciphername,
3882: int rounds)
3883: {
1.4 djm 3884: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3885: u_char salt[SALT_LEN];
1.4 djm 3886: char *b64 = NULL;
1.1 djm 3887: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3888: u_int check;
3889: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3890: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3891: const struct sshcipher *cipher;
3892: const char *kdfname = KDFNAME;
3893: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3894:
3895: if (rounds <= 0)
3896: rounds = DEFAULT_ROUNDS;
3897: if (passphrase == NULL || !strlen(passphrase)) {
3898: ciphername = "none";
3899: kdfname = "none";
3900: } else if (ciphername == NULL)
3901: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3902: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3903: r = SSH_ERR_INVALID_ARGUMENT;
3904: goto out;
3905: }
3906:
3907: if ((kdf = sshbuf_new()) == NULL ||
3908: (encoded = sshbuf_new()) == NULL ||
3909: (encrypted = sshbuf_new()) == NULL) {
3910: r = SSH_ERR_ALLOC_FAIL;
3911: goto out;
3912: }
3913: blocksize = cipher_blocksize(cipher);
3914: keylen = cipher_keylen(cipher);
3915: ivlen = cipher_ivlen(cipher);
3916: authlen = cipher_authlen(cipher);
3917: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3918: r = SSH_ERR_ALLOC_FAIL;
3919: goto out;
3920: }
3921: if (strcmp(kdfname, "bcrypt") == 0) {
3922: arc4random_buf(salt, SALT_LEN);
3923: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3924: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3925: r = SSH_ERR_INVALID_ARGUMENT;
3926: goto out;
3927: }
3928: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3929: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3930: goto out;
3931: } else if (strcmp(kdfname, "none") != 0) {
3932: /* Unsupported KDF type */
3933: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3934: goto out;
3935: }
3936: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3937: key + keylen, ivlen, 1)) != 0)
3938: goto out;
3939:
3940: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3941: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3942: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3943: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3944: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3945: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3946: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3947: goto out;
3948:
3949: /* set up the buffer that will be encrypted */
3950:
3951: /* Random check bytes */
3952: check = arc4random();
3953: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3954: (r = sshbuf_put_u32(encrypted, check)) != 0)
3955: goto out;
3956:
3957: /* append private key and comment*/
1.62 markus 3958: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3959: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3960: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3961: goto out;
3962:
3963: /* padding */
3964: i = 0;
3965: while (sshbuf_len(encrypted) % blocksize) {
3966: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3967: goto out;
3968: }
3969:
3970: /* length in destination buffer */
3971: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3972: goto out;
3973:
3974: /* encrypt */
3975: if ((r = sshbuf_reserve(encoded,
3976: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3977: goto out;
1.36 djm 3978: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3979: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3980: goto out;
3981:
1.81 djm 3982: sshbuf_reset(blob);
1.1 djm 3983:
1.81 djm 3984: /* assemble uuencoded key */
3985: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3986: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3987: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3988: goto out;
3989:
3990: /* success */
3991: r = 0;
3992:
3993: out:
3994: sshbuf_free(kdf);
3995: sshbuf_free(encoded);
3996: sshbuf_free(encrypted);
1.36 djm 3997: cipher_free(ciphercontext);
1.1 djm 3998: explicit_bzero(salt, sizeof(salt));
3999: if (key != NULL) {
4000: explicit_bzero(key, keylen + ivlen);
4001: free(key);
4002: }
4003: if (pubkeyblob != NULL) {
4004: explicit_bzero(pubkeyblob, pubkeylen);
4005: free(pubkeyblob);
4006: }
4007: if (b64 != NULL) {
4008: explicit_bzero(b64, strlen(b64));
4009: free(b64);
4010: }
4011: return r;
4012: }
4013:
4014: static int
4015: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
4016: struct sshkey **keyp, char **commentp)
4017: {
4018: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
4019: const struct sshcipher *cipher = NULL;
4020: const u_char *cp;
4021: int r = SSH_ERR_INTERNAL_ERROR;
4022: size_t encoded_len;
1.18 djm 4023: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 4024: struct sshbuf *encoded = NULL, *decoded = NULL;
4025: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 4026: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 4027: struct sshkey *k = NULL;
4028: u_char *key = NULL, *salt = NULL, *dp, pad, last;
4029: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
4030:
4031: if (keyp != NULL)
4032: *keyp = NULL;
4033: if (commentp != NULL)
4034: *commentp = NULL;
4035:
4036: if ((encoded = sshbuf_new()) == NULL ||
4037: (decoded = sshbuf_new()) == NULL ||
4038: (decrypted = sshbuf_new()) == NULL) {
4039: r = SSH_ERR_ALLOC_FAIL;
4040: goto out;
4041: }
4042:
4043: /* check preamble */
4044: cp = sshbuf_ptr(blob);
4045: encoded_len = sshbuf_len(blob);
4046: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
4047: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
4048: r = SSH_ERR_INVALID_FORMAT;
4049: goto out;
4050: }
4051: cp += MARK_BEGIN_LEN;
4052: encoded_len -= MARK_BEGIN_LEN;
4053:
4054: /* Look for end marker, removing whitespace as we go */
4055: while (encoded_len > 0) {
4056: if (*cp != '\n' && *cp != '\r') {
4057: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
4058: goto out;
4059: }
4060: last = *cp;
4061: encoded_len--;
4062: cp++;
4063: if (last == '\n') {
4064: if (encoded_len >= MARK_END_LEN &&
4065: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
4066: /* \0 terminate */
4067: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
4068: goto out;
4069: break;
4070: }
4071: }
4072: }
4073: if (encoded_len == 0) {
4074: r = SSH_ERR_INVALID_FORMAT;
4075: goto out;
4076: }
4077:
4078: /* decode base64 */
1.4 djm 4079: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 4080: goto out;
4081:
4082: /* check magic */
4083: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
4084: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
4085: r = SSH_ERR_INVALID_FORMAT;
4086: goto out;
4087: }
4088: /* parse public portion of key */
4089: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
4090: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
4091: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
4092: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
4093: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
4094: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
4095: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
4096: goto out;
4097:
4098: if ((cipher = cipher_by_name(ciphername)) == NULL) {
4099: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4100: goto out;
4101: }
4102: if ((passphrase == NULL || strlen(passphrase) == 0) &&
4103: strcmp(ciphername, "none") != 0) {
4104: /* passphrase required */
4105: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4106: goto out;
4107: }
4108: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
4109: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4110: goto out;
4111: }
4112: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
4113: r = SSH_ERR_INVALID_FORMAT;
4114: goto out;
4115: }
4116: if (nkeys != 1) {
4117: /* XXX only one key supported */
4118: r = SSH_ERR_INVALID_FORMAT;
4119: goto out;
4120: }
4121:
4122: /* check size of encrypted key blob */
4123: blocksize = cipher_blocksize(cipher);
4124: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
4125: r = SSH_ERR_INVALID_FORMAT;
4126: goto out;
4127: }
4128:
4129: /* setup key */
4130: keylen = cipher_keylen(cipher);
4131: ivlen = cipher_ivlen(cipher);
1.18 djm 4132: authlen = cipher_authlen(cipher);
1.1 djm 4133: if ((key = calloc(1, keylen + ivlen)) == NULL) {
4134: r = SSH_ERR_ALLOC_FAIL;
4135: goto out;
4136: }
4137: if (strcmp(kdfname, "bcrypt") == 0) {
4138: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4139: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4140: goto out;
4141: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4142: key, keylen + ivlen, rounds) < 0) {
4143: r = SSH_ERR_INVALID_FORMAT;
4144: goto out;
4145: }
4146: }
4147:
1.18 djm 4148: /* check that an appropriate amount of auth data is present */
1.84 djm 4149: if (sshbuf_len(decoded) < authlen ||
4150: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4151: r = SSH_ERR_INVALID_FORMAT;
4152: goto out;
4153: }
4154:
1.1 djm 4155: /* decrypt private portion of key */
4156: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4157: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4158: key + keylen, ivlen, 0)) != 0)
4159: goto out;
1.36 djm 4160: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4161: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4162: /* an integrity error here indicates an incorrect passphrase */
4163: if (r == SSH_ERR_MAC_INVALID)
4164: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4165: goto out;
4166: }
1.18 djm 4167: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4168: goto out;
4169: /* there should be no trailing data */
4170: if (sshbuf_len(decoded) != 0) {
4171: r = SSH_ERR_INVALID_FORMAT;
4172: goto out;
4173: }
4174:
4175: /* check check bytes */
4176: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4177: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4178: goto out;
4179: if (check1 != check2) {
4180: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4181: goto out;
4182: }
4183:
4184: /* Load the private key and comment */
4185: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4186: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4187: goto out;
4188:
4189: /* Check deterministic padding */
4190: i = 0;
4191: while (sshbuf_len(decrypted)) {
4192: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
4193: goto out;
4194: if (pad != (++i & 0xff)) {
4195: r = SSH_ERR_INVALID_FORMAT;
4196: goto out;
4197: }
4198: }
4199:
4200: /* XXX decode pubkey and check against private */
4201:
4202: /* success */
4203: r = 0;
4204: if (keyp != NULL) {
4205: *keyp = k;
4206: k = NULL;
4207: }
4208: if (commentp != NULL) {
4209: *commentp = comment;
4210: comment = NULL;
4211: }
4212: out:
4213: pad = 0;
1.36 djm 4214: cipher_free(ciphercontext);
1.1 djm 4215: free(ciphername);
4216: free(kdfname);
4217: free(comment);
4218: if (salt != NULL) {
4219: explicit_bzero(salt, slen);
4220: free(salt);
4221: }
4222: if (key != NULL) {
4223: explicit_bzero(key, keylen + ivlen);
4224: free(key);
4225: }
4226: sshbuf_free(encoded);
4227: sshbuf_free(decoded);
4228: sshbuf_free(kdf);
4229: sshbuf_free(decrypted);
4230: sshkey_free(k);
4231: return r;
4232: }
4233:
4234:
4235: #ifdef WITH_OPENSSL
1.80 djm 4236: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4237: static int
1.80 djm 4238: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4239: int format, const char *_passphrase, const char *comment)
1.1 djm 4240: {
1.76 djm 4241: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4242: int success, r;
4243: int blen, len = strlen(_passphrase);
4244: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4245: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4246: char *bptr;
1.1 djm 4247: BIO *bio = NULL;
1.76 djm 4248: struct sshbuf *blob;
1.80 djm 4249: EVP_PKEY *pkey = NULL;
1.1 djm 4250:
4251: if (len > 0 && len <= 4)
4252: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4253: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4254: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4255: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4256: r = SSH_ERR_ALLOC_FAIL;
4257: goto out;
4258: }
4259: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4260: r = SSH_ERR_ALLOC_FAIL;
4261: goto out;
1.76 djm 4262: }
4263: if ((r = sshkey_unshield_private(key)) != 0)
4264: goto out;
1.1 djm 4265:
4266: switch (key->type) {
4267: case KEY_DSA:
1.80 djm 4268: if (format == SSHKEY_PRIVATE_PEM) {
4269: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4270: cipher, passphrase, len, NULL, NULL);
4271: } else {
4272: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4273: }
1.1 djm 4274: break;
4275: case KEY_ECDSA:
1.80 djm 4276: if (format == SSHKEY_PRIVATE_PEM) {
4277: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4278: cipher, passphrase, len, NULL, NULL);
4279: } else {
4280: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4281: }
1.1 djm 4282: break;
4283: case KEY_RSA:
1.80 djm 4284: if (format == SSHKEY_PRIVATE_PEM) {
4285: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4286: cipher, passphrase, len, NULL, NULL);
4287: } else {
4288: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4289: }
1.1 djm 4290: break;
4291: default:
4292: success = 0;
4293: break;
4294: }
4295: if (success == 0) {
4296: r = SSH_ERR_LIBCRYPTO_ERROR;
4297: goto out;
4298: }
1.80 djm 4299: if (format == SSHKEY_PRIVATE_PKCS8) {
4300: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4301: passphrase, len, NULL, NULL)) == 0) {
4302: r = SSH_ERR_LIBCRYPTO_ERROR;
4303: goto out;
4304: }
4305: }
1.1 djm 4306: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4307: r = SSH_ERR_INTERNAL_ERROR;
4308: goto out;
4309: }
4310: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4311: goto out;
4312: r = 0;
4313: out:
1.76 djm 4314: if (was_shielded)
4315: r = sshkey_shield_private(key);
4316: if (r == 0)
4317: r = sshbuf_putb(buf, blob);
1.80 djm 4318:
4319: EVP_PKEY_free(pkey);
1.76 djm 4320: sshbuf_free(blob);
1.1 djm 4321: BIO_free(bio);
4322: return r;
4323: }
4324: #endif /* WITH_OPENSSL */
4325:
4326: /* Serialise "key" to buffer "blob" */
4327: int
4328: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4329: const char *passphrase, const char *comment,
1.80 djm 4330: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4331: {
4332: switch (key->type) {
1.9 markus 4333: #ifdef WITH_OPENSSL
1.1 djm 4334: case KEY_DSA:
4335: case KEY_ECDSA:
4336: case KEY_RSA:
1.80 djm 4337: break; /* see below */
1.1 djm 4338: #endif /* WITH_OPENSSL */
4339: case KEY_ED25519:
1.90 markus 4340: case KEY_ED25519_SK:
1.62 markus 4341: #ifdef WITH_XMSS
4342: case KEY_XMSS:
4343: #endif /* WITH_XMSS */
1.85 djm 4344: #ifdef WITH_OPENSSL
4345: case KEY_ECDSA_SK:
4346: #endif /* WITH_OPENSSL */
1.1 djm 4347: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4348: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4349: default:
4350: return SSH_ERR_KEY_TYPE_UNKNOWN;
4351: }
1.80 djm 4352:
4353: #ifdef WITH_OPENSSL
4354: switch (format) {
4355: case SSHKEY_PRIVATE_OPENSSH:
4356: return sshkey_private_to_blob2(key, blob, passphrase,
4357: comment, openssh_format_cipher, openssh_format_rounds);
4358: case SSHKEY_PRIVATE_PEM:
4359: case SSHKEY_PRIVATE_PKCS8:
4360: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4361: format, passphrase, comment);
4362: default:
4363: return SSH_ERR_INVALID_ARGUMENT;
4364: }
4365: #endif /* WITH_OPENSSL */
1.1 djm 4366: }
4367:
4368: #ifdef WITH_OPENSSL
1.8 djm 4369: static int
1.52 djm 4370: translate_libcrypto_error(unsigned long pem_err)
4371: {
4372: int pem_reason = ERR_GET_REASON(pem_err);
4373:
4374: switch (ERR_GET_LIB(pem_err)) {
4375: case ERR_LIB_PEM:
4376: switch (pem_reason) {
4377: case PEM_R_BAD_PASSWORD_READ:
4378: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4379: case PEM_R_BAD_DECRYPT:
4380: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4381: default:
4382: return SSH_ERR_INVALID_FORMAT;
4383: }
4384: case ERR_LIB_EVP:
4385: switch (pem_reason) {
4386: case EVP_R_BAD_DECRYPT:
4387: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4388: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4389: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4390: #endif
1.52 djm 4391: case EVP_R_DECODE_ERROR:
4392: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4393: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4394: #endif
4395: return SSH_ERR_INVALID_FORMAT;
4396: default:
4397: return SSH_ERR_LIBCRYPTO_ERROR;
4398: }
4399: case ERR_LIB_ASN1:
4400: return SSH_ERR_INVALID_FORMAT;
4401: }
4402: return SSH_ERR_LIBCRYPTO_ERROR;
4403: }
4404:
4405: static void
4406: clear_libcrypto_errors(void)
4407: {
4408: while (ERR_get_error() != 0)
4409: ;
4410: }
4411:
4412: /*
4413: * Translate OpenSSL error codes to determine whether
4414: * passphrase is required/incorrect.
4415: */
4416: static int
4417: convert_libcrypto_error(void)
4418: {
4419: /*
4420: * Some password errors are reported at the beginning
4421: * of the error queue.
4422: */
4423: if (translate_libcrypto_error(ERR_peek_error()) ==
4424: SSH_ERR_KEY_WRONG_PASSPHRASE)
4425: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4426: return translate_libcrypto_error(ERR_peek_last_error());
4427: }
4428:
4429: static int
1.1 djm 4430: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4431: const char *passphrase, struct sshkey **keyp)
1.1 djm 4432: {
4433: EVP_PKEY *pk = NULL;
4434: struct sshkey *prv = NULL;
4435: BIO *bio = NULL;
4436: int r;
4437:
1.32 djm 4438: if (keyp != NULL)
4439: *keyp = NULL;
1.1 djm 4440:
4441: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4442: return SSH_ERR_ALLOC_FAIL;
4443: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4444: (int)sshbuf_len(blob)) {
4445: r = SSH_ERR_ALLOC_FAIL;
4446: goto out;
4447: }
4448:
1.52 djm 4449: clear_libcrypto_errors();
1.1 djm 4450: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4451: (char *)passphrase)) == NULL) {
1.71 djm 4452: /*
4453: * libcrypto may return various ASN.1 errors when attempting
4454: * to parse a key with an incorrect passphrase.
4455: * Treat all format errors as "incorrect passphrase" if a
4456: * passphrase was supplied.
4457: */
4458: if (passphrase != NULL && *passphrase != '\0')
4459: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4460: else
4461: r = convert_libcrypto_error();
1.1 djm 4462: goto out;
4463: }
1.69 djm 4464: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4465: (type == KEY_UNSPEC || type == KEY_RSA)) {
4466: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4467: r = SSH_ERR_ALLOC_FAIL;
4468: goto out;
4469: }
4470: prv->rsa = EVP_PKEY_get1_RSA(pk);
4471: prv->type = KEY_RSA;
4472: #ifdef DEBUG_PK
4473: RSA_print_fp(stderr, prv->rsa, 8);
4474: #endif
4475: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4476: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4477: goto out;
4478: }
1.69 djm 4479: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4480: goto out;
1.69 djm 4481: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4482: (type == KEY_UNSPEC || type == KEY_DSA)) {
4483: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4484: r = SSH_ERR_ALLOC_FAIL;
4485: goto out;
4486: }
4487: prv->dsa = EVP_PKEY_get1_DSA(pk);
4488: prv->type = KEY_DSA;
4489: #ifdef DEBUG_PK
4490: DSA_print_fp(stderr, prv->dsa, 8);
4491: #endif
1.69 djm 4492: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4493: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4494: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4495: r = SSH_ERR_ALLOC_FAIL;
4496: goto out;
4497: }
4498: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4499: prv->type = KEY_ECDSA;
4500: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4501: if (prv->ecdsa_nid == -1 ||
4502: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4503: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4504: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4505: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4506: r = SSH_ERR_INVALID_FORMAT;
4507: goto out;
4508: }
4509: #ifdef DEBUG_PK
4510: if (prv != NULL && prv->ecdsa != NULL)
4511: sshkey_dump_ec_key(prv->ecdsa);
4512: #endif
4513: } else {
4514: r = SSH_ERR_INVALID_FORMAT;
4515: goto out;
4516: }
4517: r = 0;
1.32 djm 4518: if (keyp != NULL) {
4519: *keyp = prv;
4520: prv = NULL;
4521: }
1.1 djm 4522: out:
4523: BIO_free(bio);
1.60 jsing 4524: EVP_PKEY_free(pk);
1.30 mmcc 4525: sshkey_free(prv);
1.1 djm 4526: return r;
4527: }
4528: #endif /* WITH_OPENSSL */
4529:
4530: int
4531: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4532: const char *passphrase, struct sshkey **keyp, char **commentp)
4533: {
1.42 djm 4534: int r = SSH_ERR_INTERNAL_ERROR;
4535:
1.32 djm 4536: if (keyp != NULL)
4537: *keyp = NULL;
1.1 djm 4538: if (commentp != NULL)
4539: *commentp = NULL;
4540:
4541: switch (type) {
1.9 markus 4542: #ifdef WITH_OPENSSL
1.1 djm 4543: case KEY_DSA:
4544: case KEY_ECDSA:
4545: case KEY_RSA:
1.8 djm 4546: return sshkey_parse_private_pem_fileblob(blob, type,
4547: passphrase, keyp);
1.1 djm 4548: #endif /* WITH_OPENSSL */
4549: case KEY_ED25519:
1.62 markus 4550: #ifdef WITH_XMSS
4551: case KEY_XMSS:
4552: #endif /* WITH_XMSS */
1.1 djm 4553: return sshkey_parse_private2(blob, type, passphrase,
4554: keyp, commentp);
4555: case KEY_UNSPEC:
1.42 djm 4556: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4557: commentp);
4558: /* Do not fallback to PEM parser if only passphrase is wrong. */
4559: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4560: return r;
1.1 djm 4561: #ifdef WITH_OPENSSL
1.8 djm 4562: return sshkey_parse_private_pem_fileblob(blob, type,
4563: passphrase, keyp);
1.1 djm 4564: #else
4565: return SSH_ERR_INVALID_FORMAT;
4566: #endif /* WITH_OPENSSL */
4567: default:
4568: return SSH_ERR_KEY_TYPE_UNKNOWN;
4569: }
4570: }
4571:
4572: int
4573: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4574: struct sshkey **keyp, char **commentp)
1.1 djm 4575: {
4576: if (keyp != NULL)
4577: *keyp = NULL;
4578: if (commentp != NULL)
4579: *commentp = NULL;
4580:
1.23 tim 4581: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4582: passphrase, keyp, commentp);
1.96 djm 4583: }
4584:
4585: void
4586: sshkey_sig_details_free(struct sshkey_sig_details *details)
4587: {
4588: freezero(details, sizeof(*details));
1.1 djm 4589: }
1.62 markus 4590:
4591: #ifdef WITH_XMSS
4592: /*
4593: * serialize the key with the current state and forward the state
4594: * maxsign times.
4595: */
4596: int
1.77 djm 4597: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4598: u_int32_t maxsign, sshkey_printfn *pr)
4599: {
4600: int r, rupdate;
4601:
4602: if (maxsign == 0 ||
4603: sshkey_type_plain(k->type) != KEY_XMSS)
4604: return sshkey_private_serialize_opt(k, b,
4605: SSHKEY_SERIALIZE_DEFAULT);
4606: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4607: (r = sshkey_private_serialize_opt(k, b,
4608: SSHKEY_SERIALIZE_STATE)) != 0 ||
4609: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4610: goto out;
4611: r = 0;
4612: out:
4613: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4614: if (r == 0)
4615: r = rupdate;
4616: }
4617: return r;
4618: }
4619:
4620: u_int32_t
4621: sshkey_signatures_left(const struct sshkey *k)
4622: {
4623: if (sshkey_type_plain(k->type) == KEY_XMSS)
4624: return sshkey_xmss_signatures_left(k);
4625: return 0;
4626: }
4627:
4628: int
4629: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4630: {
4631: if (sshkey_type_plain(k->type) != KEY_XMSS)
4632: return SSH_ERR_INVALID_ARGUMENT;
4633: return sshkey_xmss_enable_maxsign(k, maxsign);
4634: }
4635:
4636: int
4637: sshkey_set_filename(struct sshkey *k, const char *filename)
4638: {
4639: if (k == NULL)
4640: return SSH_ERR_INVALID_ARGUMENT;
4641: if (sshkey_type_plain(k->type) != KEY_XMSS)
4642: return 0;
4643: if (filename == NULL)
4644: return SSH_ERR_INVALID_ARGUMENT;
4645: if ((k->xmss_filename = strdup(filename)) == NULL)
4646: return SSH_ERR_ALLOC_FAIL;
4647: return 0;
4648: }
4649: #else
4650: int
1.76 djm 4651: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4652: u_int32_t maxsign, sshkey_printfn *pr)
4653: {
4654: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4655: }
4656:
4657: u_int32_t
4658: sshkey_signatures_left(const struct sshkey *k)
4659: {
4660: return 0;
4661: }
4662:
4663: int
4664: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4665: {
4666: return SSH_ERR_INVALID_ARGUMENT;
4667: }
4668:
4669: int
4670: sshkey_set_filename(struct sshkey *k, const char *filename)
4671: {
4672: if (k == NULL)
4673: return SSH_ERR_INVALID_ARGUMENT;
4674: return 0;
4675: }
4676: #endif /* WITH_XMSS */
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