Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.91
1.91 ! markus 1: /* $OpenBSD: sshkey.c,v 1.90 2019/11/12 19:33:08 markus 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
680: BN_CTX *bnctx;
1.69 djm 681: const BIGNUM *rsa_e_a, *rsa_n_a;
682: const BIGNUM *rsa_e_b, *rsa_n_b;
683: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
684: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 685: #endif /* WITH_OPENSSL */
686:
687: if (a == NULL || b == NULL ||
688: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
689: return 0;
690:
691: switch (a->type) {
692: #ifdef WITH_OPENSSL
693: case KEY_RSA_CERT:
694: case KEY_RSA:
1.69 djm 695: if (a->rsa == NULL || b->rsa == NULL)
696: return 0;
697: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
698: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
699: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
700: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 701: case KEY_DSA_CERT:
702: case KEY_DSA:
1.69 djm 703: if (a->dsa == NULL || b->dsa == NULL)
704: return 0;
705: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
706: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
707: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
708: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
709: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
710: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
711: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
712: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.85 djm 713: case KEY_ECDSA_SK:
714: case KEY_ECDSA_SK_CERT:
715: if (a->sk_application == NULL || b->sk_application == NULL)
716: return 0;
717: if (strcmp(a->sk_application, b->sk_application) != 0)
718: return 0;
719: /* FALLTHROUGH */
1.1 djm 720: case KEY_ECDSA_CERT:
721: case KEY_ECDSA:
722: if (a->ecdsa == NULL || b->ecdsa == NULL ||
723: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
724: EC_KEY_get0_public_key(b->ecdsa) == NULL)
725: return 0;
726: if ((bnctx = BN_CTX_new()) == NULL)
727: return 0;
728: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
729: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
730: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
731: EC_KEY_get0_public_key(a->ecdsa),
732: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
733: BN_CTX_free(bnctx);
734: return 0;
735: }
736: BN_CTX_free(bnctx);
737: return 1;
738: #endif /* WITH_OPENSSL */
1.90 markus 739: case KEY_ED25519_SK:
740: case KEY_ED25519_SK_CERT:
741: if (a->sk_application == NULL || b->sk_application == NULL)
742: return 0;
743: if (strcmp(a->sk_application, b->sk_application) != 0)
744: return 0;
745: /* FALLTHROUGH */
1.1 djm 746: case KEY_ED25519:
747: case KEY_ED25519_CERT:
748: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
749: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 750: #ifdef WITH_XMSS
751: case KEY_XMSS:
752: case KEY_XMSS_CERT:
753: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
754: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
755: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
756: #endif /* WITH_XMSS */
1.1 djm 757: default:
758: return 0;
759: }
760: /* NOTREACHED */
761: }
762:
763: int
764: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
765: {
766: if (a == NULL || b == NULL || a->type != b->type)
767: return 0;
768: if (sshkey_is_cert(a)) {
769: if (!cert_compare(a->cert, b->cert))
770: return 0;
771: }
772: return sshkey_equal_public(a, b);
773: }
774:
775: static int
1.62 markus 776: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
777: enum sshkey_serialize_rep opts)
1.1 djm 778: {
779: int type, ret = SSH_ERR_INTERNAL_ERROR;
780: const char *typename;
1.69 djm 781: #ifdef WITH_OPENSSL
782: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
783: #endif /* WITH_OPENSSL */
1.1 djm 784:
785: if (key == NULL)
786: return SSH_ERR_INVALID_ARGUMENT;
787:
1.19 djm 788: if (sshkey_is_cert(key)) {
789: if (key->cert == NULL)
790: return SSH_ERR_EXPECTED_CERT;
791: if (sshbuf_len(key->cert->certblob) == 0)
792: return SSH_ERR_KEY_LACKS_CERTBLOB;
793: }
1.1 djm 794: type = force_plain ? sshkey_type_plain(key->type) : key->type;
795: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
796:
797: switch (type) {
798: #ifdef WITH_OPENSSL
799: case KEY_DSA_CERT:
800: case KEY_ECDSA_CERT:
1.85 djm 801: case KEY_ECDSA_SK_CERT:
1.1 djm 802: case KEY_RSA_CERT:
803: #endif /* WITH_OPENSSL */
804: case KEY_ED25519_CERT:
1.62 markus 805: #ifdef WITH_XMSS
806: case KEY_XMSS_CERT:
807: #endif /* WITH_XMSS */
1.1 djm 808: /* Use the existing blob */
809: /* XXX modified flag? */
810: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
811: return ret;
812: break;
813: #ifdef WITH_OPENSSL
814: case KEY_DSA:
815: if (key->dsa == NULL)
816: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 817: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
818: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 819: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 820: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
821: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
822: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
823: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 824: return ret;
825: break;
826: case KEY_ECDSA:
1.85 djm 827: case KEY_ECDSA_SK:
1.1 djm 828: if (key->ecdsa == NULL)
829: return SSH_ERR_INVALID_ARGUMENT;
830: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
831: (ret = sshbuf_put_cstring(b,
832: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
833: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
834: return ret;
1.85 djm 835: if (type == KEY_ECDSA_SK) {
836: if ((ret = sshbuf_put_cstring(b,
837: key->sk_application)) != 0)
838: return ret;
839: }
1.1 djm 840: break;
841: case KEY_RSA:
842: if (key->rsa == NULL)
843: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 844: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 845: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 846: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
847: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 848: return ret;
849: break;
850: #endif /* WITH_OPENSSL */
851: case KEY_ED25519:
1.90 markus 852: case KEY_ED25519_SK:
1.1 djm 853: if (key->ed25519_pk == NULL)
854: return SSH_ERR_INVALID_ARGUMENT;
855: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
856: (ret = sshbuf_put_string(b,
857: key->ed25519_pk, ED25519_PK_SZ)) != 0)
858: return ret;
1.90 markus 859: if (type == KEY_ED25519_SK) {
860: if ((ret = sshbuf_put_cstring(b,
861: key->sk_application)) != 0)
862: return ret;
863: }
1.1 djm 864: break;
1.62 markus 865: #ifdef WITH_XMSS
866: case KEY_XMSS:
867: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
868: sshkey_xmss_pklen(key) == 0)
869: return SSH_ERR_INVALID_ARGUMENT;
870: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
871: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
872: (ret = sshbuf_put_string(b,
873: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
874: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
875: return ret;
876: break;
877: #endif /* WITH_XMSS */
1.1 djm 878: default:
879: return SSH_ERR_KEY_TYPE_UNKNOWN;
880: }
881: return 0;
882: }
883:
884: int
1.14 djm 885: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 886: {
1.62 markus 887: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 888: }
889:
890: int
1.62 markus 891: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
892: enum sshkey_serialize_rep opts)
1.14 djm 893: {
894: struct sshbuf *tmp;
895: int r;
896:
897: if ((tmp = sshbuf_new()) == NULL)
898: return SSH_ERR_ALLOC_FAIL;
1.62 markus 899: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 900: if (r == 0)
901: r = sshbuf_put_stringb(b, tmp);
902: sshbuf_free(tmp);
903: return r;
904: }
905:
906: int
1.62 markus 907: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
908: {
909: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
910: }
911:
912: int
1.14 djm 913: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 914: {
1.62 markus 915: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 916: }
917:
918: static int
1.62 markus 919: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
920: enum sshkey_serialize_rep opts)
1.1 djm 921: {
922: int ret = SSH_ERR_INTERNAL_ERROR;
923: size_t len;
924: struct sshbuf *b = NULL;
925:
926: if (lenp != NULL)
927: *lenp = 0;
928: if (blobp != NULL)
929: *blobp = NULL;
930: if ((b = sshbuf_new()) == NULL)
931: return SSH_ERR_ALLOC_FAIL;
1.62 markus 932: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 933: goto out;
934: len = sshbuf_len(b);
935: if (lenp != NULL)
936: *lenp = len;
937: if (blobp != NULL) {
938: if ((*blobp = malloc(len)) == NULL) {
939: ret = SSH_ERR_ALLOC_FAIL;
940: goto out;
941: }
942: memcpy(*blobp, sshbuf_ptr(b), len);
943: }
944: ret = 0;
945: out:
946: sshbuf_free(b);
947: return ret;
948: }
949:
950: int
951: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
952: {
1.62 markus 953: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 954: }
955:
956: int
957: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
958: {
1.62 markus 959: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 960: }
961:
962: int
1.7 djm 963: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 964: u_char **retp, size_t *lenp)
965: {
966: u_char *blob = NULL, *ret = NULL;
967: size_t blob_len = 0;
1.7 djm 968: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 969:
970: if (retp != NULL)
971: *retp = NULL;
972: if (lenp != NULL)
973: *lenp = 0;
1.7 djm 974: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 975: r = SSH_ERR_INVALID_ARGUMENT;
976: goto out;
977: }
1.62 markus 978: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
979: != 0)
1.1 djm 980: goto out;
981: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
982: r = SSH_ERR_ALLOC_FAIL;
983: goto out;
984: }
1.7 djm 985: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 986: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
987: goto out;
988: /* success */
989: if (retp != NULL) {
990: *retp = ret;
991: ret = NULL;
992: }
993: if (lenp != NULL)
1.7 djm 994: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 995: r = 0;
996: out:
997: free(ret);
998: if (blob != NULL) {
999: explicit_bzero(blob, blob_len);
1000: free(blob);
1001: }
1002: return r;
1003: }
1004:
1005: static char *
1.7 djm 1006: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1007: {
1008: char *ret;
1009: size_t plen = strlen(alg) + 1;
1010: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
1011:
1012: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
1013: return NULL;
1014: strlcpy(ret, alg, rlen);
1015: strlcat(ret, ":", rlen);
1016: if (dgst_raw_len == 0)
1017: return ret;
1.79 dtucker 1018: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 1019: freezero(ret, rlen);
1.7 djm 1020: return NULL;
1021: }
1022: /* Trim padding characters from end */
1023: ret[strcspn(ret, "=")] = '\0';
1024: return ret;
1025: }
1026:
1027: static char *
1028: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 1029: {
1.7 djm 1030: char *retval, hex[5];
1031: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 1032:
1.7 djm 1033: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 1034: return NULL;
1.7 djm 1035: strlcpy(retval, alg, rlen);
1036: strlcat(retval, ":", rlen);
1.1 djm 1037: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 1038: snprintf(hex, sizeof(hex), "%s%02x",
1039: i > 0 ? ":" : "", dgst_raw[i]);
1040: strlcat(retval, hex, rlen);
1.1 djm 1041: }
1042: return retval;
1043: }
1044:
1045: static char *
1046: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
1047: {
1048: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1049: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1050: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1051: u_int i, j = 0, rounds, seed = 1;
1052: char *retval;
1053:
1054: rounds = (dgst_raw_len / 2) + 1;
1055: if ((retval = calloc(rounds, 6)) == NULL)
1056: return NULL;
1057: retval[j++] = 'x';
1058: for (i = 0; i < rounds; i++) {
1059: u_int idx0, idx1, idx2, idx3, idx4;
1060: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1061: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1062: seed) % 6;
1063: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1064: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1065: (seed / 6)) % 6;
1066: retval[j++] = vowels[idx0];
1067: retval[j++] = consonants[idx1];
1068: retval[j++] = vowels[idx2];
1069: if ((i + 1) < rounds) {
1070: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1071: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1072: retval[j++] = consonants[idx3];
1073: retval[j++] = '-';
1074: retval[j++] = consonants[idx4];
1075: seed = ((seed * 5) +
1076: ((((u_int)(dgst_raw[2 * i])) * 7) +
1077: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1078: }
1079: } else {
1080: idx0 = seed % 6;
1081: idx1 = 16;
1082: idx2 = seed / 6;
1083: retval[j++] = vowels[idx0];
1084: retval[j++] = consonants[idx1];
1085: retval[j++] = vowels[idx2];
1086: }
1087: }
1088: retval[j++] = 'x';
1089: retval[j++] = '\0';
1090: return retval;
1091: }
1092:
1093: /*
1094: * Draw an ASCII-Art representing the fingerprint so human brain can
1095: * profit from its built-in pattern recognition ability.
1096: * This technique is called "random art" and can be found in some
1097: * scientific publications like this original paper:
1098: *
1099: * "Hash Visualization: a New Technique to improve Real-World Security",
1100: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1101: * Techniques and E-Commerce (CrypTEC '99)
1102: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1103: *
1104: * The subject came up in a talk by Dan Kaminsky, too.
1105: *
1106: * If you see the picture is different, the key is different.
1107: * If the picture looks the same, you still know nothing.
1108: *
1109: * The algorithm used here is a worm crawling over a discrete plane,
1110: * leaving a trace (augmenting the field) everywhere it goes.
1111: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1112: * makes the respective movement vector be ignored for this turn.
1113: * Graphs are not unambiguous, because circles in graphs can be
1114: * walked in either direction.
1115: */
1116:
1117: /*
1118: * Field sizes for the random art. Have to be odd, so the starting point
1119: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1120: * Else pictures would be too dense, and drawing the frame would
1121: * fail, too, because the key type would not fit in anymore.
1122: */
1123: #define FLDBASE 8
1124: #define FLDSIZE_Y (FLDBASE + 1)
1125: #define FLDSIZE_X (FLDBASE * 2 + 1)
1126: static char *
1.7 djm 1127: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1128: const struct sshkey *k)
1129: {
1130: /*
1131: * Chars to be used after each other every time the worm
1132: * intersects with itself. Matter of taste.
1133: */
1134: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1135: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1136: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1137: size_t i, tlen, hlen;
1.1 djm 1138: u_int b;
1.3 djm 1139: int x, y, r;
1.1 djm 1140: size_t len = strlen(augmentation_string) - 1;
1141:
1142: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1143: return NULL;
1144:
1145: /* initialize field */
1146: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1147: x = FLDSIZE_X / 2;
1148: y = FLDSIZE_Y / 2;
1149:
1150: /* process raw key */
1151: for (i = 0; i < dgst_raw_len; i++) {
1152: int input;
1153: /* each byte conveys four 2-bit move commands */
1154: input = dgst_raw[i];
1155: for (b = 0; b < 4; b++) {
1156: /* evaluate 2 bit, rest is shifted later */
1157: x += (input & 0x1) ? 1 : -1;
1158: y += (input & 0x2) ? 1 : -1;
1159:
1160: /* assure we are still in bounds */
1.37 deraadt 1161: x = MAXIMUM(x, 0);
1162: y = MAXIMUM(y, 0);
1163: x = MINIMUM(x, FLDSIZE_X - 1);
1164: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1165:
1166: /* augment the field */
1167: if (field[x][y] < len - 2)
1168: field[x][y]++;
1169: input = input >> 2;
1170: }
1171: }
1172:
1173: /* mark starting point and end point*/
1174: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1175: field[x][y] = len;
1176:
1.3 djm 1177: /* assemble title */
1178: r = snprintf(title, sizeof(title), "[%s %u]",
1179: sshkey_type(k), sshkey_size(k));
1180: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1181: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1182: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1183: tlen = (r <= 0) ? 0 : strlen(title);
1184:
1185: /* assemble hash ID. */
1186: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1187: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1188:
1189: /* output upper border */
1.3 djm 1190: p = retval;
1191: *p++ = '+';
1192: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1193: *p++ = '-';
1194: memcpy(p, title, tlen);
1195: p += tlen;
1.7 djm 1196: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1197: *p++ = '-';
1198: *p++ = '+';
1199: *p++ = '\n';
1200:
1201: /* output content */
1202: for (y = 0; y < FLDSIZE_Y; y++) {
1203: *p++ = '|';
1204: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1205: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1206: *p++ = '|';
1207: *p++ = '\n';
1208: }
1209:
1210: /* output lower border */
1211: *p++ = '+';
1.7 djm 1212: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1213: *p++ = '-';
1214: memcpy(p, hash, hlen);
1215: p += hlen;
1216: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1217: *p++ = '-';
1218: *p++ = '+';
1219:
1220: return retval;
1221: }
1222:
1223: char *
1.7 djm 1224: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1225: enum sshkey_fp_rep dgst_rep)
1226: {
1227: char *retval = NULL;
1228: u_char *dgst_raw;
1229: size_t dgst_raw_len;
1230:
1.7 djm 1231: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1232: return NULL;
1233: switch (dgst_rep) {
1.7 djm 1234: case SSH_FP_DEFAULT:
1235: if (dgst_alg == SSH_DIGEST_MD5) {
1236: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1237: dgst_raw, dgst_raw_len);
1238: } else {
1239: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1240: dgst_raw, dgst_raw_len);
1241: }
1242: break;
1.1 djm 1243: case SSH_FP_HEX:
1.7 djm 1244: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1245: dgst_raw, dgst_raw_len);
1246: break;
1247: case SSH_FP_BASE64:
1248: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1249: dgst_raw, dgst_raw_len);
1.1 djm 1250: break;
1251: case SSH_FP_BUBBLEBABBLE:
1252: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1253: break;
1254: case SSH_FP_RANDOMART:
1.7 djm 1255: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1256: dgst_raw, dgst_raw_len, k);
1.1 djm 1257: break;
1258: default:
1259: explicit_bzero(dgst_raw, dgst_raw_len);
1260: free(dgst_raw);
1261: return NULL;
1262: }
1263: explicit_bzero(dgst_raw, dgst_raw_len);
1264: free(dgst_raw);
1265: return retval;
1266: }
1267:
1.63 djm 1268: static int
1269: peek_type_nid(const char *s, size_t l, int *nid)
1270: {
1271: const struct keytype *kt;
1272:
1273: for (kt = keytypes; kt->type != -1; kt++) {
1274: if (kt->name == NULL || strlen(kt->name) != l)
1275: continue;
1276: if (memcmp(s, kt->name, l) == 0) {
1277: *nid = -1;
1.85 djm 1278: if (key_type_is_ecdsa_variant(kt->type))
1.63 djm 1279: *nid = kt->nid;
1280: return kt->type;
1281: }
1282: }
1283: return KEY_UNSPEC;
1284: }
1285:
1.1 djm 1286:
1.63 djm 1287: /* XXX this can now be made const char * */
1.1 djm 1288: int
1289: sshkey_read(struct sshkey *ret, char **cpp)
1290: {
1291: struct sshkey *k;
1.63 djm 1292: char *cp, *blobcopy;
1293: size_t space;
1.1 djm 1294: int r, type, curve_nid = -1;
1295: struct sshbuf *blob;
1.44 dtucker 1296:
1297: if (ret == NULL)
1298: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1299:
1300: switch (ret->type) {
1301: case KEY_UNSPEC:
1302: case KEY_RSA:
1303: case KEY_DSA:
1304: case KEY_ECDSA:
1.85 djm 1305: case KEY_ECDSA_SK:
1.1 djm 1306: case KEY_ED25519:
1.90 markus 1307: case KEY_ED25519_SK:
1.1 djm 1308: case KEY_DSA_CERT:
1309: case KEY_ECDSA_CERT:
1.85 djm 1310: case KEY_ECDSA_SK_CERT:
1.1 djm 1311: case KEY_RSA_CERT:
1312: case KEY_ED25519_CERT:
1.90 markus 1313: case KEY_ED25519_SK_CERT:
1.62 markus 1314: #ifdef WITH_XMSS
1315: case KEY_XMSS:
1316: case KEY_XMSS_CERT:
1317: #endif /* WITH_XMSS */
1.63 djm 1318: break; /* ok */
1319: default:
1320: return SSH_ERR_INVALID_ARGUMENT;
1321: }
1322:
1323: /* Decode type */
1324: cp = *cpp;
1325: space = strcspn(cp, " \t");
1326: if (space == strlen(cp))
1327: return SSH_ERR_INVALID_FORMAT;
1328: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1329: return SSH_ERR_INVALID_FORMAT;
1330:
1331: /* skip whitespace */
1332: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1333: ;
1334: if (*cp == '\0')
1335: return SSH_ERR_INVALID_FORMAT;
1336: if (ret->type != KEY_UNSPEC && ret->type != type)
1337: return SSH_ERR_KEY_TYPE_MISMATCH;
1338: if ((blob = sshbuf_new()) == NULL)
1339: return SSH_ERR_ALLOC_FAIL;
1340:
1341: /* find end of keyblob and decode */
1342: space = strcspn(cp, " \t");
1343: if ((blobcopy = strndup(cp, space)) == NULL) {
1344: sshbuf_free(blob);
1345: return SSH_ERR_ALLOC_FAIL;
1346: }
1347: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1348: free(blobcopy);
1349: sshbuf_free(blob);
1350: return r;
1351: }
1352: free(blobcopy);
1353: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1354: sshbuf_free(blob);
1.63 djm 1355: return r;
1356: }
1357: sshbuf_free(blob);
1358:
1359: /* skip whitespace and leave cp at start of comment */
1360: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1361: ;
1362:
1363: /* ensure type of blob matches type at start of line */
1364: if (k->type != type) {
1365: sshkey_free(k);
1366: return SSH_ERR_KEY_TYPE_MISMATCH;
1367: }
1.85 djm 1368: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1369: sshkey_free(k);
1370: return SSH_ERR_EC_CURVE_MISMATCH;
1371: }
1372:
1373: /* Fill in ret from parsed key */
1374: ret->type = type;
1375: if (sshkey_is_cert(ret)) {
1376: if (!sshkey_is_cert(k)) {
1.1 djm 1377: sshkey_free(k);
1.63 djm 1378: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1379: }
1.63 djm 1380: if (ret->cert != NULL)
1381: cert_free(ret->cert);
1382: ret->cert = k->cert;
1383: k->cert = NULL;
1384: }
1385: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1386: #ifdef WITH_OPENSSL
1.63 djm 1387: case KEY_RSA:
1388: RSA_free(ret->rsa);
1389: ret->rsa = k->rsa;
1390: k->rsa = NULL;
1.1 djm 1391: #ifdef DEBUG_PK
1.63 djm 1392: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1393: #endif
1.63 djm 1394: break;
1395: case KEY_DSA:
1396: DSA_free(ret->dsa);
1397: ret->dsa = k->dsa;
1398: k->dsa = NULL;
1.1 djm 1399: #ifdef DEBUG_PK
1.63 djm 1400: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1401: #endif
1.63 djm 1402: break;
1403: case KEY_ECDSA:
1404: EC_KEY_free(ret->ecdsa);
1405: ret->ecdsa = k->ecdsa;
1406: ret->ecdsa_nid = k->ecdsa_nid;
1407: k->ecdsa = NULL;
1408: k->ecdsa_nid = -1;
1.1 djm 1409: #ifdef DEBUG_PK
1.63 djm 1410: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1411: #endif
1.63 djm 1412: break;
1.85 djm 1413: case KEY_ECDSA_SK:
1414: EC_KEY_free(ret->ecdsa);
1415: ret->ecdsa = k->ecdsa;
1416: ret->ecdsa_nid = k->ecdsa_nid;
1417: ret->sk_application = k->sk_application;
1418: k->ecdsa = NULL;
1419: k->ecdsa_nid = -1;
1420: k->sk_application = NULL;
1421: #ifdef DEBUG_PK
1422: sshkey_dump_ec_key(ret->ecdsa);
1423: fprintf(stderr, "App: %s\n", ret->sk_application);
1424: #endif
1425: break;
1.1 djm 1426: #endif /* WITH_OPENSSL */
1.63 djm 1427: case KEY_ED25519:
1428: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1429: ret->ed25519_pk = k->ed25519_pk;
1430: k->ed25519_pk = NULL;
1.1 djm 1431: #ifdef DEBUG_PK
1.63 djm 1432: /* XXX */
1.1 djm 1433: #endif
1.63 djm 1434: break;
1.90 markus 1435: case KEY_ED25519_SK:
1436: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1437: ret->ed25519_pk = k->ed25519_pk;
1438: ret->sk_application = k->sk_application;
1439: k->ed25519_pk = NULL;
1440: k->sk_application = NULL;
1441: break;
1.62 markus 1442: #ifdef WITH_XMSS
1.63 djm 1443: case KEY_XMSS:
1444: free(ret->xmss_pk);
1445: ret->xmss_pk = k->xmss_pk;
1446: k->xmss_pk = NULL;
1447: free(ret->xmss_state);
1448: ret->xmss_state = k->xmss_state;
1449: k->xmss_state = NULL;
1450: free(ret->xmss_name);
1451: ret->xmss_name = k->xmss_name;
1452: k->xmss_name = NULL;
1453: free(ret->xmss_filename);
1454: ret->xmss_filename = k->xmss_filename;
1455: k->xmss_filename = NULL;
1.62 markus 1456: #ifdef DEBUG_PK
1.63 djm 1457: /* XXX */
1.62 markus 1458: #endif
1.63 djm 1459: break;
1.62 markus 1460: #endif /* WITH_XMSS */
1.63 djm 1461: default:
1.1 djm 1462: sshkey_free(k);
1.63 djm 1463: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1464: }
1.63 djm 1465: sshkey_free(k);
1466:
1467: /* success */
1468: *cpp = cp;
1469: return 0;
1.1 djm 1470: }
1471:
1472: int
1.19 djm 1473: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1474: {
1.19 djm 1475: int r = SSH_ERR_INTERNAL_ERROR;
1476: struct sshbuf *b = NULL;
1.1 djm 1477: char *uu = NULL;
1.19 djm 1478:
1479: if (b64p != NULL)
1480: *b64p = NULL;
1481: if ((b = sshbuf_new()) == NULL)
1482: return SSH_ERR_ALLOC_FAIL;
1483: if ((r = sshkey_putb(key, b)) != 0)
1484: goto out;
1.81 djm 1485: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1486: r = SSH_ERR_ALLOC_FAIL;
1487: goto out;
1488: }
1489: /* Success */
1490: if (b64p != NULL) {
1491: *b64p = uu;
1492: uu = NULL;
1493: }
1494: r = 0;
1495: out:
1496: sshbuf_free(b);
1497: free(uu);
1498: return r;
1499: }
1500:
1.52 djm 1501: int
1.19 djm 1502: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1503: {
1504: int r = SSH_ERR_INTERNAL_ERROR;
1505: char *uu = NULL;
1506:
1.48 djm 1507: if ((r = sshkey_to_base64(key, &uu)) != 0)
1508: goto out;
1509: if ((r = sshbuf_putf(b, "%s %s",
1510: sshkey_ssh_name(key), uu)) != 0)
1511: goto out;
1.19 djm 1512: r = 0;
1513: out:
1514: free(uu);
1515: return r;
1516: }
1517:
1518: int
1519: sshkey_write(const struct sshkey *key, FILE *f)
1520: {
1521: struct sshbuf *b = NULL;
1522: int r = SSH_ERR_INTERNAL_ERROR;
1523:
1524: if ((b = sshbuf_new()) == NULL)
1525: return SSH_ERR_ALLOC_FAIL;
1526: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1527: goto out;
1528: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1529: if (feof(f))
1530: errno = EPIPE;
1.19 djm 1531: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1532: goto out;
1533: }
1.19 djm 1534: /* Success */
1535: r = 0;
1.1 djm 1536: out:
1.19 djm 1537: sshbuf_free(b);
1538: return r;
1.1 djm 1539: }
1540:
1541: const char *
1542: sshkey_cert_type(const struct sshkey *k)
1543: {
1544: switch (k->cert->type) {
1545: case SSH2_CERT_TYPE_USER:
1546: return "user";
1547: case SSH2_CERT_TYPE_HOST:
1548: return "host";
1549: default:
1550: return "unknown";
1551: }
1552: }
1553:
1554: #ifdef WITH_OPENSSL
1555: static int
1556: rsa_generate_private_key(u_int bits, RSA **rsap)
1557: {
1558: RSA *private = NULL;
1559: BIGNUM *f4 = NULL;
1560: int ret = SSH_ERR_INTERNAL_ERROR;
1561:
1.49 djm 1562: if (rsap == NULL)
1563: return SSH_ERR_INVALID_ARGUMENT;
1564: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1565: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1566: return SSH_ERR_KEY_LENGTH;
1.1 djm 1567: *rsap = NULL;
1568: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1569: ret = SSH_ERR_ALLOC_FAIL;
1570: goto out;
1571: }
1572: if (!BN_set_word(f4, RSA_F4) ||
1573: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1574: ret = SSH_ERR_LIBCRYPTO_ERROR;
1575: goto out;
1576: }
1577: *rsap = private;
1578: private = NULL;
1579: ret = 0;
1580: out:
1.60 jsing 1581: RSA_free(private);
1582: BN_free(f4);
1.1 djm 1583: return ret;
1584: }
1585:
1586: static int
1587: dsa_generate_private_key(u_int bits, DSA **dsap)
1588: {
1589: DSA *private;
1590: int ret = SSH_ERR_INTERNAL_ERROR;
1591:
1.49 djm 1592: if (dsap == NULL)
1.1 djm 1593: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1594: if (bits != 1024)
1595: return SSH_ERR_KEY_LENGTH;
1.1 djm 1596: if ((private = DSA_new()) == NULL) {
1597: ret = SSH_ERR_ALLOC_FAIL;
1598: goto out;
1599: }
1600: *dsap = NULL;
1601: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1602: NULL, NULL) || !DSA_generate_key(private)) {
1603: ret = SSH_ERR_LIBCRYPTO_ERROR;
1604: goto out;
1605: }
1606: *dsap = private;
1607: private = NULL;
1608: ret = 0;
1609: out:
1.60 jsing 1610: DSA_free(private);
1.1 djm 1611: return ret;
1612: }
1613:
1614: int
1615: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1616: {
1617: EC_GROUP *eg;
1618: int nids[] = {
1619: NID_X9_62_prime256v1,
1620: NID_secp384r1,
1621: NID_secp521r1,
1622: -1
1623: };
1624: int nid;
1625: u_int i;
1626: BN_CTX *bnctx;
1627: const EC_GROUP *g = EC_KEY_get0_group(k);
1628:
1629: /*
1630: * The group may be stored in a ASN.1 encoded private key in one of two
1631: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1632: * or explicit group parameters encoded into the key blob. Only the
1633: * "named group" case sets the group NID for us, but we can figure
1634: * it out for the other case by comparing against all the groups that
1635: * are supported.
1636: */
1637: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1638: return nid;
1639: if ((bnctx = BN_CTX_new()) == NULL)
1640: return -1;
1641: for (i = 0; nids[i] != -1; i++) {
1642: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1643: BN_CTX_free(bnctx);
1644: return -1;
1645: }
1646: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1647: break;
1648: EC_GROUP_free(eg);
1649: }
1650: BN_CTX_free(bnctx);
1651: if (nids[i] != -1) {
1652: /* Use the group with the NID attached */
1653: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1654: if (EC_KEY_set_group(k, eg) != 1) {
1655: EC_GROUP_free(eg);
1656: return -1;
1657: }
1658: }
1659: return nids[i];
1660: }
1661:
1662: static int
1663: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1664: {
1665: EC_KEY *private;
1666: int ret = SSH_ERR_INTERNAL_ERROR;
1667:
1.50 djm 1668: if (nid == NULL || ecdsap == NULL)
1.1 djm 1669: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1670: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1671: return SSH_ERR_KEY_LENGTH;
1.1 djm 1672: *ecdsap = NULL;
1673: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1674: ret = SSH_ERR_ALLOC_FAIL;
1675: goto out;
1676: }
1677: if (EC_KEY_generate_key(private) != 1) {
1678: ret = SSH_ERR_LIBCRYPTO_ERROR;
1679: goto out;
1680: }
1681: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1682: *ecdsap = private;
1683: private = NULL;
1684: ret = 0;
1685: out:
1.60 jsing 1686: EC_KEY_free(private);
1.1 djm 1687: return ret;
1688: }
1689: #endif /* WITH_OPENSSL */
1690:
1691: int
1692: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1693: {
1694: struct sshkey *k;
1695: int ret = SSH_ERR_INTERNAL_ERROR;
1696:
1697: if (keyp == NULL)
1698: return SSH_ERR_INVALID_ARGUMENT;
1699: *keyp = NULL;
1700: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1701: return SSH_ERR_ALLOC_FAIL;
1702: switch (type) {
1703: case KEY_ED25519:
1704: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1705: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1706: ret = SSH_ERR_ALLOC_FAIL;
1707: break;
1708: }
1709: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1710: ret = 0;
1711: break;
1.62 markus 1712: #ifdef WITH_XMSS
1713: case KEY_XMSS:
1714: ret = sshkey_xmss_generate_private_key(k, bits);
1715: break;
1716: #endif /* WITH_XMSS */
1.1 djm 1717: #ifdef WITH_OPENSSL
1718: case KEY_DSA:
1719: ret = dsa_generate_private_key(bits, &k->dsa);
1720: break;
1721: case KEY_ECDSA:
1722: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1723: &k->ecdsa);
1724: break;
1725: case KEY_RSA:
1726: ret = rsa_generate_private_key(bits, &k->rsa);
1727: break;
1728: #endif /* WITH_OPENSSL */
1729: default:
1730: ret = SSH_ERR_INVALID_ARGUMENT;
1731: }
1732: if (ret == 0) {
1733: k->type = type;
1734: *keyp = k;
1735: } else
1736: sshkey_free(k);
1737: return ret;
1738: }
1739:
1740: int
1741: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1742: {
1743: u_int i;
1744: const struct sshkey_cert *from;
1745: struct sshkey_cert *to;
1.67 djm 1746: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1747:
1.67 djm 1748: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1749: return SSH_ERR_INVALID_ARGUMENT;
1750:
1.67 djm 1751: if ((to = cert_new()) == NULL)
1.1 djm 1752: return SSH_ERR_ALLOC_FAIL;
1753:
1.67 djm 1754: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1755: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1756: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1757: goto out;
1.1 djm 1758:
1759: to->serial = from->serial;
1760: to->type = from->type;
1761: if (from->key_id == NULL)
1762: to->key_id = NULL;
1.67 djm 1763: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1764: r = SSH_ERR_ALLOC_FAIL;
1765: goto out;
1766: }
1.1 djm 1767: to->valid_after = from->valid_after;
1768: to->valid_before = from->valid_before;
1769: if (from->signature_key == NULL)
1770: to->signature_key = NULL;
1.67 djm 1771: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1772: &to->signature_key)) != 0)
1.67 djm 1773: goto out;
1774: if (from->signature_type != NULL &&
1775: (to->signature_type = strdup(from->signature_type)) == NULL) {
1776: r = SSH_ERR_ALLOC_FAIL;
1777: goto out;
1778: }
1779: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1780: r = SSH_ERR_INVALID_ARGUMENT;
1781: goto out;
1782: }
1.1 djm 1783: if (from->nprincipals > 0) {
1784: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1785: sizeof(*to->principals))) == NULL) {
1786: r = SSH_ERR_ALLOC_FAIL;
1787: goto out;
1788: }
1.1 djm 1789: for (i = 0; i < from->nprincipals; i++) {
1790: to->principals[i] = strdup(from->principals[i]);
1791: if (to->principals[i] == NULL) {
1792: to->nprincipals = i;
1.67 djm 1793: r = SSH_ERR_ALLOC_FAIL;
1794: goto out;
1.1 djm 1795: }
1796: }
1797: }
1798: to->nprincipals = from->nprincipals;
1.67 djm 1799:
1800: /* success */
1801: cert_free(to_key->cert);
1802: to_key->cert = to;
1803: to = NULL;
1804: r = 0;
1805: out:
1806: cert_free(to);
1807: return r;
1.1 djm 1808: }
1809:
1810: int
1811: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1812: {
1813: struct sshkey *n = NULL;
1.69 djm 1814: int r = SSH_ERR_INTERNAL_ERROR;
1815: #ifdef WITH_OPENSSL
1816: const BIGNUM *rsa_n, *rsa_e;
1817: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1818: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1819: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1820: BIGNUM *dsa_pub_key_dup = NULL;
1821: #endif /* WITH_OPENSSL */
1.1 djm 1822:
1.24 djm 1823: *pkp = NULL;
1.85 djm 1824: if ((n = sshkey_new(k->type)) == NULL) {
1825: r = SSH_ERR_ALLOC_FAIL;
1826: goto out;
1827: }
1.1 djm 1828: switch (k->type) {
1829: #ifdef WITH_OPENSSL
1830: case KEY_DSA:
1831: case KEY_DSA_CERT:
1.69 djm 1832: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1833: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1834: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1835: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1836: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1837: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1838: r = SSH_ERR_ALLOC_FAIL;
1839: goto out;
1840: }
1841: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1842: r = SSH_ERR_LIBCRYPTO_ERROR;
1843: goto out;
1.1 djm 1844: }
1.69 djm 1845: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1846: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1847: r = SSH_ERR_LIBCRYPTO_ERROR;
1848: goto out;
1849: }
1850: dsa_pub_key_dup = NULL; /* transferred */
1851:
1.1 djm 1852: break;
1853: case KEY_ECDSA:
1854: case KEY_ECDSA_CERT:
1.85 djm 1855: case KEY_ECDSA_SK:
1856: case KEY_ECDSA_SK_CERT:
1.1 djm 1857: n->ecdsa_nid = k->ecdsa_nid;
1858: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1859: if (n->ecdsa == NULL) {
1.69 djm 1860: r = SSH_ERR_ALLOC_FAIL;
1861: goto out;
1.1 djm 1862: }
1863: if (EC_KEY_set_public_key(n->ecdsa,
1864: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1865: r = SSH_ERR_LIBCRYPTO_ERROR;
1866: goto out;
1.1 djm 1867: }
1.85 djm 1868: if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT)
1869: break;
1870: /* Append security-key application string */
1871: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1872: goto out;
1.1 djm 1873: break;
1874: case KEY_RSA:
1875: case KEY_RSA_CERT:
1.69 djm 1876: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1877: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1878: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1879: r = SSH_ERR_ALLOC_FAIL;
1880: goto out;
1881: }
1882: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1883: r = SSH_ERR_LIBCRYPTO_ERROR;
1884: goto out;
1885: }
1886: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1887: break;
1888: #endif /* WITH_OPENSSL */
1889: case KEY_ED25519:
1890: case KEY_ED25519_CERT:
1.90 markus 1891: case KEY_ED25519_SK:
1892: case KEY_ED25519_SK_CERT:
1.1 djm 1893: if (k->ed25519_pk != NULL) {
1894: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1895: r = SSH_ERR_ALLOC_FAIL;
1896: goto out;
1.1 djm 1897: }
1898: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1899: }
1.90 markus 1900: if (k->type != KEY_ED25519_SK &&
1901: k->type != KEY_ED25519_SK_CERT)
1902: break;
1903: /* Append security-key application string */
1904: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1905: goto out;
1.1 djm 1906: break;
1.62 markus 1907: #ifdef WITH_XMSS
1908: case KEY_XMSS:
1909: case KEY_XMSS_CERT:
1.69 djm 1910: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1911: goto out;
1.62 markus 1912: if (k->xmss_pk != NULL) {
1913: size_t pklen = sshkey_xmss_pklen(k);
1914: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1915: r = SSH_ERR_INTERNAL_ERROR;
1916: goto out;
1.62 markus 1917: }
1918: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1919: r = SSH_ERR_ALLOC_FAIL;
1920: goto out;
1.62 markus 1921: }
1922: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1923: }
1924: break;
1925: #endif /* WITH_XMSS */
1.1 djm 1926: default:
1.69 djm 1927: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1928: goto out;
1.1 djm 1929: }
1.69 djm 1930: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1931: goto out;
1932: /* success */
1.1 djm 1933: *pkp = n;
1.69 djm 1934: n = NULL;
1935: r = 0;
1936: out:
1937: sshkey_free(n);
1.83 djm 1938: #ifdef WITH_OPENSSL
1.69 djm 1939: BN_clear_free(rsa_n_dup);
1940: BN_clear_free(rsa_e_dup);
1941: BN_clear_free(dsa_p_dup);
1942: BN_clear_free(dsa_q_dup);
1943: BN_clear_free(dsa_g_dup);
1944: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1945: #endif /* WITH_OPENSSL */
1.69 djm 1946:
1947: return r;
1.1 djm 1948: }
1949:
1.76 djm 1950: int
1951: sshkey_is_shielded(struct sshkey *k)
1952: {
1953: return k != NULL && k->shielded_private != NULL;
1954: }
1955:
1956: int
1957: sshkey_shield_private(struct sshkey *k)
1958: {
1959: struct sshbuf *prvbuf = NULL;
1960: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1961: struct sshcipher_ctx *cctx = NULL;
1962: const struct sshcipher *cipher;
1963: size_t i, enclen = 0;
1964: struct sshkey *kswap = NULL, tmp;
1965: int r = SSH_ERR_INTERNAL_ERROR;
1966:
1967: #ifdef DEBUG_PK
1968: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1969: #endif
1970: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1971: r = SSH_ERR_INVALID_ARGUMENT;
1972: goto out;
1973: }
1974: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1975: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1976: r = SSH_ERR_INTERNAL_ERROR;
1977: goto out;
1978: }
1979:
1980: /* Prepare a random pre-key, and from it an ephemeral key */
1981: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1982: r = SSH_ERR_ALLOC_FAIL;
1983: goto out;
1984: }
1985: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1986: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1987: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1988: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1989: goto out;
1990: #ifdef DEBUG_PK
1991: fprintf(stderr, "%s: key+iv\n", __func__);
1992: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1993: stderr);
1994: #endif
1995: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1996: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1997: goto out;
1998:
1999: /* Serialise and encrypt the private key using the ephemeral key */
2000: if ((prvbuf = sshbuf_new()) == NULL) {
2001: r = SSH_ERR_ALLOC_FAIL;
2002: goto out;
2003: }
2004: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
2005: goto out;
2006: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.91 ! markus 2007: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 2008: goto out;
2009: /* pad to cipher blocksize */
2010: i = 0;
2011: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
2012: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
2013: goto out;
2014: }
2015: #ifdef DEBUG_PK
2016: fprintf(stderr, "%s: serialised\n", __func__);
2017: sshbuf_dump(prvbuf, stderr);
2018: #endif
2019: /* encrypt */
2020: enclen = sshbuf_len(prvbuf);
2021: if ((enc = malloc(enclen)) == NULL) {
2022: r = SSH_ERR_ALLOC_FAIL;
2023: goto out;
2024: }
2025: if ((r = cipher_crypt(cctx, 0, enc,
2026: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
2027: goto out;
2028: #ifdef DEBUG_PK
2029: fprintf(stderr, "%s: encrypted\n", __func__);
2030: sshbuf_dump_data(enc, enclen, stderr);
2031: #endif
2032:
2033: /* Make a scrubbed, public-only copy of our private key argument */
2034: if ((r = sshkey_from_private(k, &kswap)) != 0)
2035: goto out;
2036:
2037: /* Swap the private key out (it will be destroyed below) */
2038: tmp = *kswap;
2039: *kswap = *k;
2040: *k = tmp;
2041:
2042: /* Insert the shielded key into our argument */
2043: k->shielded_private = enc;
2044: k->shielded_len = enclen;
2045: k->shield_prekey = prekey;
2046: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
2047: enc = prekey = NULL; /* transferred */
2048: enclen = 0;
2049:
2050: /* success */
2051: r = 0;
2052:
2053: out:
2054: /* XXX behaviour on error - invalidate original private key? */
2055: cipher_free(cctx);
2056: explicit_bzero(keyiv, sizeof(keyiv));
2057: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 2058: freezero(enc, enclen);
1.76 djm 2059: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
2060: sshkey_free(kswap);
2061: sshbuf_free(prvbuf);
2062: return r;
2063: }
2064:
2065: int
2066: sshkey_unshield_private(struct sshkey *k)
2067: {
2068: struct sshbuf *prvbuf = NULL;
2069: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
2070: struct sshcipher_ctx *cctx = NULL;
2071: const struct sshcipher *cipher;
2072: size_t i;
2073: struct sshkey *kswap = NULL, tmp;
2074: int r = SSH_ERR_INTERNAL_ERROR;
2075:
2076: #ifdef DEBUG_PK
2077: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
2078: #endif
2079: if (!sshkey_is_shielded(k))
2080: return 0; /* nothing to do */
2081:
2082: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
2083: r = SSH_ERR_INVALID_ARGUMENT;
2084: goto out;
2085: }
2086: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
2087: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
2088: r = SSH_ERR_INTERNAL_ERROR;
2089: goto out;
2090: }
2091: /* check size of shielded key blob */
2092: if (k->shielded_len < cipher_blocksize(cipher) ||
2093: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
2094: r = SSH_ERR_INVALID_FORMAT;
2095: goto out;
2096: }
2097:
2098: /* Calculate the ephemeral key from the prekey */
2099: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2100: k->shield_prekey, k->shield_prekey_len,
2101: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2102: goto out;
2103: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2104: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2105: goto out;
2106: #ifdef DEBUG_PK
2107: fprintf(stderr, "%s: key+iv\n", __func__);
2108: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2109: stderr);
2110: #endif
2111:
2112: /* Decrypt and parse the shielded private key using the ephemeral key */
2113: if ((prvbuf = sshbuf_new()) == NULL) {
2114: r = SSH_ERR_ALLOC_FAIL;
2115: goto out;
2116: }
2117: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2118: goto out;
2119: /* decrypt */
2120: #ifdef DEBUG_PK
2121: fprintf(stderr, "%s: encrypted\n", __func__);
2122: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2123: #endif
2124: if ((r = cipher_crypt(cctx, 0, cp,
2125: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2126: goto out;
2127: #ifdef DEBUG_PK
2128: fprintf(stderr, "%s: serialised\n", __func__);
2129: sshbuf_dump(prvbuf, stderr);
2130: #endif
2131: /* Parse private key */
2132: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2133: goto out;
2134: /* Check deterministic padding */
2135: i = 0;
2136: while (sshbuf_len(prvbuf)) {
2137: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2138: goto out;
2139: if (pad != (++i & 0xff)) {
2140: r = SSH_ERR_INVALID_FORMAT;
2141: goto out;
2142: }
2143: }
2144:
2145: /* Swap the parsed key back into place */
2146: tmp = *kswap;
2147: *kswap = *k;
2148: *k = tmp;
2149:
2150: /* success */
2151: r = 0;
2152:
2153: out:
2154: cipher_free(cctx);
2155: explicit_bzero(keyiv, sizeof(keyiv));
2156: explicit_bzero(&tmp, sizeof(tmp));
2157: sshkey_free(kswap);
2158: sshbuf_free(prvbuf);
2159: return r;
2160: }
2161:
1.1 djm 2162: static int
1.14 djm 2163: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2164: {
1.14 djm 2165: struct sshbuf *principals = NULL, *crit = NULL;
2166: struct sshbuf *exts = NULL, *ca = NULL;
2167: u_char *sig = NULL;
2168: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2169: int ret = SSH_ERR_INTERNAL_ERROR;
2170:
2171: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2172: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2173: return ret;
2174:
1.20 djm 2175: /* Parse body of certificate up to signature */
2176: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2177: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2178: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2179: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2180: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2181: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2182: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2183: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2184: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2185: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2186: /* XXX debug print error for ret */
2187: ret = SSH_ERR_INVALID_FORMAT;
2188: goto out;
2189: }
2190:
2191: /* Signature is left in the buffer so we can calculate this length */
2192: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2193:
2194: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2195: ret = SSH_ERR_INVALID_FORMAT;
2196: goto out;
2197: }
2198:
2199: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2200: key->cert->type != SSH2_CERT_TYPE_HOST) {
2201: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2202: goto out;
2203: }
2204:
1.4 djm 2205: /* Parse principals section */
2206: while (sshbuf_len(principals) > 0) {
2207: char *principal = NULL;
2208: char **oprincipals = NULL;
2209:
1.1 djm 2210: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2211: ret = SSH_ERR_INVALID_FORMAT;
2212: goto out;
2213: }
1.4 djm 2214: if ((ret = sshbuf_get_cstring(principals, &principal,
2215: NULL)) != 0) {
1.1 djm 2216: ret = SSH_ERR_INVALID_FORMAT;
2217: goto out;
2218: }
2219: oprincipals = key->cert->principals;
1.51 deraadt 2220: key->cert->principals = recallocarray(key->cert->principals,
2221: key->cert->nprincipals, key->cert->nprincipals + 1,
2222: sizeof(*key->cert->principals));
1.1 djm 2223: if (key->cert->principals == NULL) {
2224: free(principal);
2225: key->cert->principals = oprincipals;
2226: ret = SSH_ERR_ALLOC_FAIL;
2227: goto out;
2228: }
2229: key->cert->principals[key->cert->nprincipals++] = principal;
2230: }
2231:
1.4 djm 2232: /*
2233: * Stash a copies of the critical options and extensions sections
2234: * for later use.
2235: */
2236: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2237: (exts != NULL &&
2238: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2239: goto out;
2240:
1.4 djm 2241: /*
2242: * Validate critical options and extensions sections format.
2243: */
2244: while (sshbuf_len(crit) != 0) {
2245: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2246: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2247: sshbuf_reset(key->cert->critical);
1.1 djm 2248: ret = SSH_ERR_INVALID_FORMAT;
2249: goto out;
2250: }
2251: }
1.4 djm 2252: while (exts != NULL && sshbuf_len(exts) != 0) {
2253: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2254: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2255: sshbuf_reset(key->cert->extensions);
1.1 djm 2256: ret = SSH_ERR_INVALID_FORMAT;
2257: goto out;
2258: }
2259: }
2260:
1.4 djm 2261: /* Parse CA key and check signature */
1.14 djm 2262: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2263: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2264: goto out;
2265: }
2266: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2267: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2268: goto out;
2269: }
2270: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 2271: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 2272: goto out;
1.82 djm 2273: if ((ret = sshkey_get_sigtype(sig, slen,
2274: &key->cert->signature_type)) != 0)
1.67 djm 2275: goto out;
1.4 djm 2276:
2277: /* Success */
1.1 djm 2278: ret = 0;
2279: out:
1.14 djm 2280: sshbuf_free(ca);
1.4 djm 2281: sshbuf_free(crit);
2282: sshbuf_free(exts);
2283: sshbuf_free(principals);
1.1 djm 2284: free(sig);
2285: return ret;
2286: }
2287:
1.83 djm 2288: #ifdef WITH_OPENSSL
1.1 djm 2289: static int
1.69 djm 2290: check_rsa_length(const RSA *rsa)
2291: {
2292: const BIGNUM *rsa_n;
2293:
2294: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2295: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2296: return SSH_ERR_KEY_LENGTH;
2297: return 0;
2298: }
1.83 djm 2299: #endif /* WITH_OPENSSL */
1.69 djm 2300:
2301: static int
1.14 djm 2302: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2303: int allow_cert)
1.1 djm 2304: {
1.12 djm 2305: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2306: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2307: struct sshkey *key = NULL;
2308: size_t len;
2309: u_char *pk = NULL;
1.14 djm 2310: struct sshbuf *copy;
1.1 djm 2311: #ifdef WITH_OPENSSL
2312: EC_POINT *q = NULL;
1.69 djm 2313: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2314: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2315: #endif /* WITH_OPENSSL */
2316:
2317: #ifdef DEBUG_PK /* XXX */
1.14 djm 2318: sshbuf_dump(b, stderr);
1.1 djm 2319: #endif
1.32 djm 2320: if (keyp != NULL)
2321: *keyp = NULL;
1.14 djm 2322: if ((copy = sshbuf_fromb(b)) == NULL) {
2323: ret = SSH_ERR_ALLOC_FAIL;
2324: goto out;
2325: }
1.1 djm 2326: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2327: ret = SSH_ERR_INVALID_FORMAT;
2328: goto out;
2329: }
2330:
2331: type = sshkey_type_from_name(ktype);
2332: if (!allow_cert && sshkey_type_is_cert(type)) {
2333: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2334: goto out;
2335: }
2336: switch (type) {
2337: #ifdef WITH_OPENSSL
2338: case KEY_RSA_CERT:
1.14 djm 2339: /* Skip nonce */
1.1 djm 2340: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2341: ret = SSH_ERR_INVALID_FORMAT;
2342: goto out;
2343: }
2344: /* FALLTHROUGH */
2345: case KEY_RSA:
2346: if ((key = sshkey_new(type)) == NULL) {
2347: ret = SSH_ERR_ALLOC_FAIL;
2348: goto out;
2349: }
1.73 djm 2350: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2351: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2352: ret = SSH_ERR_INVALID_FORMAT;
2353: goto out;
2354: }
1.69 djm 2355: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2356: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2357: goto out;
2358: }
1.69 djm 2359: rsa_n = rsa_e = NULL; /* transferred */
2360: if ((ret = check_rsa_length(key->rsa)) != 0)
2361: goto out;
1.1 djm 2362: #ifdef DEBUG_PK
2363: RSA_print_fp(stderr, key->rsa, 8);
2364: #endif
2365: break;
2366: case KEY_DSA_CERT:
1.14 djm 2367: /* Skip nonce */
1.1 djm 2368: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2369: ret = SSH_ERR_INVALID_FORMAT;
2370: goto out;
2371: }
2372: /* FALLTHROUGH */
2373: case KEY_DSA:
2374: if ((key = sshkey_new(type)) == NULL) {
2375: ret = SSH_ERR_ALLOC_FAIL;
2376: goto out;
2377: }
1.73 djm 2378: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2379: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2380: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2381: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2382: ret = SSH_ERR_INVALID_FORMAT;
2383: goto out;
2384: }
1.69 djm 2385: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2386: ret = SSH_ERR_LIBCRYPTO_ERROR;
2387: goto out;
2388: }
2389: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2390: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2391: ret = SSH_ERR_LIBCRYPTO_ERROR;
2392: goto out;
2393: }
2394: dsa_pub_key = NULL; /* transferred */
1.1 djm 2395: #ifdef DEBUG_PK
2396: DSA_print_fp(stderr, key->dsa, 8);
2397: #endif
2398: break;
2399: case KEY_ECDSA_CERT:
1.85 djm 2400: case KEY_ECDSA_SK_CERT:
1.14 djm 2401: /* Skip nonce */
1.1 djm 2402: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2403: ret = SSH_ERR_INVALID_FORMAT;
2404: goto out;
2405: }
2406: /* FALLTHROUGH */
2407: case KEY_ECDSA:
1.85 djm 2408: case KEY_ECDSA_SK:
1.1 djm 2409: if ((key = sshkey_new(type)) == NULL) {
2410: ret = SSH_ERR_ALLOC_FAIL;
2411: goto out;
2412: }
1.12 djm 2413: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2414: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2415: ret = SSH_ERR_INVALID_FORMAT;
2416: goto out;
2417: }
2418: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2419: ret = SSH_ERR_EC_CURVE_MISMATCH;
2420: goto out;
2421: }
1.60 jsing 2422: EC_KEY_free(key->ecdsa);
1.1 djm 2423: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2424: == NULL) {
2425: ret = SSH_ERR_EC_CURVE_INVALID;
2426: goto out;
2427: }
2428: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2429: ret = SSH_ERR_ALLOC_FAIL;
2430: goto out;
2431: }
2432: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2433: ret = SSH_ERR_INVALID_FORMAT;
2434: goto out;
2435: }
2436: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2437: q) != 0) {
2438: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2439: goto out;
2440: }
2441: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2442: /* XXX assume it is a allocation error */
2443: ret = SSH_ERR_ALLOC_FAIL;
2444: goto out;
2445: }
2446: #ifdef DEBUG_PK
2447: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2448: #endif
1.85 djm 2449: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2450: /* Parse additional security-key application string */
2451: if (sshbuf_get_cstring(b, &key->sk_application,
2452: NULL) != 0) {
2453: ret = SSH_ERR_INVALID_FORMAT;
2454: goto out;
2455: }
2456: #ifdef DEBUG_PK
2457: fprintf(stderr, "App: %s\n", key->sk_application);
2458: #endif
2459: }
1.1 djm 2460: break;
2461: #endif /* WITH_OPENSSL */
2462: case KEY_ED25519_CERT:
1.90 markus 2463: case KEY_ED25519_SK_CERT:
1.14 djm 2464: /* Skip nonce */
1.1 djm 2465: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2466: ret = SSH_ERR_INVALID_FORMAT;
2467: goto out;
2468: }
2469: /* FALLTHROUGH */
2470: case KEY_ED25519:
1.90 markus 2471: case KEY_ED25519_SK:
1.1 djm 2472: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2473: goto out;
2474: if (len != ED25519_PK_SZ) {
2475: ret = SSH_ERR_INVALID_FORMAT;
2476: goto out;
2477: }
2478: if ((key = sshkey_new(type)) == NULL) {
2479: ret = SSH_ERR_ALLOC_FAIL;
2480: goto out;
2481: }
1.90 markus 2482: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2483: /* Parse additional security-key application string */
2484: if (sshbuf_get_cstring(b, &key->sk_application,
2485: NULL) != 0) {
2486: ret = SSH_ERR_INVALID_FORMAT;
2487: goto out;
2488: }
2489: #ifdef DEBUG_PK
2490: fprintf(stderr, "App: %s\n", key->sk_application);
2491: #endif
2492: }
1.1 djm 2493: key->ed25519_pk = pk;
2494: pk = NULL;
2495: break;
1.62 markus 2496: #ifdef WITH_XMSS
2497: case KEY_XMSS_CERT:
2498: /* Skip nonce */
2499: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2500: ret = SSH_ERR_INVALID_FORMAT;
2501: goto out;
2502: }
2503: /* FALLTHROUGH */
2504: case KEY_XMSS:
2505: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2506: goto out;
2507: if ((key = sshkey_new(type)) == NULL) {
2508: ret = SSH_ERR_ALLOC_FAIL;
2509: goto out;
2510: }
2511: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2512: goto out;
2513: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2514: goto out;
2515: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2516: ret = SSH_ERR_INVALID_FORMAT;
2517: goto out;
2518: }
2519: key->xmss_pk = pk;
2520: pk = NULL;
2521: if (type != KEY_XMSS_CERT &&
2522: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2523: goto out;
2524: break;
2525: #endif /* WITH_XMSS */
1.1 djm 2526: case KEY_UNSPEC:
2527: default:
2528: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2529: goto out;
2530: }
2531:
2532: /* Parse certificate potion */
1.14 djm 2533: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2534: goto out;
2535:
2536: if (key != NULL && sshbuf_len(b) != 0) {
2537: ret = SSH_ERR_INVALID_FORMAT;
2538: goto out;
2539: }
2540: ret = 0;
1.32 djm 2541: if (keyp != NULL) {
2542: *keyp = key;
2543: key = NULL;
2544: }
1.1 djm 2545: out:
1.14 djm 2546: sshbuf_free(copy);
1.1 djm 2547: sshkey_free(key);
1.62 markus 2548: free(xmss_name);
1.1 djm 2549: free(ktype);
2550: free(curve);
2551: free(pk);
2552: #ifdef WITH_OPENSSL
1.60 jsing 2553: EC_POINT_free(q);
1.69 djm 2554: BN_clear_free(rsa_n);
2555: BN_clear_free(rsa_e);
2556: BN_clear_free(dsa_p);
2557: BN_clear_free(dsa_q);
2558: BN_clear_free(dsa_g);
2559: BN_clear_free(dsa_pub_key);
1.1 djm 2560: #endif /* WITH_OPENSSL */
2561: return ret;
2562: }
2563:
2564: int
2565: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2566: {
1.14 djm 2567: struct sshbuf *b;
2568: int r;
2569:
2570: if ((b = sshbuf_from(blob, blen)) == NULL)
2571: return SSH_ERR_ALLOC_FAIL;
2572: r = sshkey_from_blob_internal(b, keyp, 1);
2573: sshbuf_free(b);
2574: return r;
2575: }
2576:
2577: int
2578: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2579: {
2580: return sshkey_from_blob_internal(b, keyp, 1);
2581: }
2582:
2583: int
2584: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2585: {
2586: struct sshbuf *b;
2587: int r;
2588:
2589: if ((r = sshbuf_froms(buf, &b)) != 0)
2590: return r;
2591: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2592: sshbuf_free(b);
2593: return r;
2594: }
2595:
1.82 djm 2596: int
2597: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2598: {
2599: int r;
2600: struct sshbuf *b = NULL;
2601: char *sigtype = NULL;
2602:
2603: if (sigtypep != NULL)
2604: *sigtypep = NULL;
2605: if ((b = sshbuf_from(sig, siglen)) == NULL)
2606: return SSH_ERR_ALLOC_FAIL;
2607: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2608: goto out;
2609: /* success */
2610: if (sigtypep != NULL) {
2611: *sigtypep = sigtype;
2612: sigtype = NULL;
2613: }
2614: r = 0;
2615: out:
2616: free(sigtype);
1.14 djm 2617: sshbuf_free(b);
2618: return r;
1.68 djm 2619: }
2620:
2621: /*
2622: *
2623: * Checks whether a certificate's signature type is allowed.
2624: * Returns 0 (success) if the certificate signature type appears in the
2625: * "allowed" pattern-list, or the key is not a certificate to begin with.
2626: * Otherwise returns a ssherr.h code.
2627: */
2628: int
2629: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2630: {
2631: if (key == NULL || allowed == NULL)
2632: return SSH_ERR_INVALID_ARGUMENT;
2633: if (!sshkey_type_is_cert(key->type))
2634: return 0;
2635: if (key->cert == NULL || key->cert->signature_type == NULL)
2636: return SSH_ERR_INVALID_ARGUMENT;
2637: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2638: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2639: return 0;
1.65 djm 2640: }
2641:
2642: /*
2643: * Returns the expected signature algorithm for a given public key algorithm.
2644: */
1.66 djm 2645: const char *
2646: sshkey_sigalg_by_name(const char *name)
1.65 djm 2647: {
2648: const struct keytype *kt;
2649:
2650: for (kt = keytypes; kt->type != -1; kt++) {
2651: if (strcmp(kt->name, name) != 0)
2652: continue;
2653: if (kt->sigalg != NULL)
2654: return kt->sigalg;
2655: if (!kt->cert)
2656: return kt->name;
2657: return sshkey_ssh_name_from_type_nid(
2658: sshkey_type_plain(kt->type), kt->nid);
2659: }
2660: return NULL;
2661: }
2662:
2663: /*
2664: * Verifies that the signature algorithm appearing inside the signature blob
2665: * matches that which was requested.
2666: */
2667: int
2668: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2669: const char *requested_alg)
2670: {
2671: const char *expected_alg;
2672: char *sigtype = NULL;
2673: int r;
2674:
2675: if (requested_alg == NULL)
2676: return 0;
1.66 djm 2677: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2678: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2679: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2680: return r;
2681: r = strcmp(expected_alg, sigtype) == 0;
2682: free(sigtype);
2683: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2684: }
2685:
2686: int
1.76 djm 2687: sshkey_sign(struct sshkey *key,
1.1 djm 2688: u_char **sigp, size_t *lenp,
1.86 djm 2689: const u_char *data, size_t datalen,
2690: const char *alg, const char *sk_provider, u_int compat)
1.1 djm 2691: {
1.76 djm 2692: int was_shielded = sshkey_is_shielded(key);
2693: int r2, r = SSH_ERR_INTERNAL_ERROR;
2694:
1.1 djm 2695: if (sigp != NULL)
2696: *sigp = NULL;
2697: if (lenp != NULL)
2698: *lenp = 0;
2699: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2700: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2701: if ((r = sshkey_unshield_private(key)) != 0)
2702: return r;
1.1 djm 2703: switch (key->type) {
2704: #ifdef WITH_OPENSSL
2705: case KEY_DSA_CERT:
2706: case KEY_DSA:
1.76 djm 2707: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2708: break;
1.1 djm 2709: case KEY_ECDSA_CERT:
2710: case KEY_ECDSA:
1.76 djm 2711: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2712: break;
1.86 djm 2713: case KEY_ECDSA_SK_CERT:
2714: case KEY_ECDSA_SK:
1.88 markus 2715: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2716: compat);
1.86 djm 2717: break;
1.1 djm 2718: case KEY_RSA_CERT:
2719: case KEY_RSA:
1.76 djm 2720: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2721: break;
1.1 djm 2722: #endif /* WITH_OPENSSL */
2723: case KEY_ED25519:
2724: case KEY_ED25519_CERT:
1.76 djm 2725: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2726: break;
2727: case KEY_ED25519_SK:
2728: case KEY_ED25519_SK_CERT:
2729: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2730: compat);
1.76 djm 2731: break;
1.62 markus 2732: #ifdef WITH_XMSS
2733: case KEY_XMSS:
2734: case KEY_XMSS_CERT:
1.76 djm 2735: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2736: break;
1.62 markus 2737: #endif /* WITH_XMSS */
1.1 djm 2738: default:
1.76 djm 2739: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2740: break;
1.1 djm 2741: }
1.76 djm 2742: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2743: return r2;
2744: return r;
1.1 djm 2745: }
2746:
2747: /*
2748: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2749: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2750: */
2751: int
2752: sshkey_verify(const struct sshkey *key,
2753: const u_char *sig, size_t siglen,
1.59 djm 2754: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2755: {
1.6 djm 2756: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2757: return SSH_ERR_INVALID_ARGUMENT;
2758: switch (key->type) {
2759: #ifdef WITH_OPENSSL
2760: case KEY_DSA_CERT:
2761: case KEY_DSA:
2762: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2763: case KEY_ECDSA_CERT:
2764: case KEY_ECDSA:
2765: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2766: case KEY_ECDSA_SK_CERT:
2767: case KEY_ECDSA_SK:
2768: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
2769: compat);
1.1 djm 2770: case KEY_RSA_CERT:
2771: case KEY_RSA:
1.59 djm 2772: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2773: #endif /* WITH_OPENSSL */
2774: case KEY_ED25519:
2775: case KEY_ED25519_CERT:
2776: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2777: case KEY_ED25519_SK:
2778: case KEY_ED25519_SK_CERT:
2779: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
2780: compat);
1.62 markus 2781: #ifdef WITH_XMSS
2782: case KEY_XMSS:
2783: case KEY_XMSS_CERT:
2784: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2785: #endif /* WITH_XMSS */
1.1 djm 2786: default:
2787: return SSH_ERR_KEY_TYPE_UNKNOWN;
2788: }
2789: }
2790:
2791: /* Convert a plain key to their _CERT equivalent */
2792: int
1.20 djm 2793: sshkey_to_certified(struct sshkey *k)
1.1 djm 2794: {
2795: int newtype;
2796:
2797: switch (k->type) {
2798: #ifdef WITH_OPENSSL
2799: case KEY_RSA:
1.20 djm 2800: newtype = KEY_RSA_CERT;
1.1 djm 2801: break;
2802: case KEY_DSA:
1.20 djm 2803: newtype = KEY_DSA_CERT;
1.1 djm 2804: break;
2805: case KEY_ECDSA:
2806: newtype = KEY_ECDSA_CERT;
2807: break;
1.85 djm 2808: case KEY_ECDSA_SK:
2809: newtype = KEY_ECDSA_SK_CERT;
2810: break;
1.1 djm 2811: #endif /* WITH_OPENSSL */
1.90 markus 2812: case KEY_ED25519_SK:
2813: newtype = KEY_ED25519_SK_CERT;
2814: break;
1.1 djm 2815: case KEY_ED25519:
2816: newtype = KEY_ED25519_CERT;
2817: break;
1.62 markus 2818: #ifdef WITH_XMSS
2819: case KEY_XMSS:
2820: newtype = KEY_XMSS_CERT;
2821: break;
2822: #endif /* WITH_XMSS */
1.1 djm 2823: default:
2824: return SSH_ERR_INVALID_ARGUMENT;
2825: }
2826: if ((k->cert = cert_new()) == NULL)
2827: return SSH_ERR_ALLOC_FAIL;
2828: k->type = newtype;
2829: return 0;
2830: }
2831:
2832: /* Convert a certificate to its raw key equivalent */
2833: int
2834: sshkey_drop_cert(struct sshkey *k)
2835: {
2836: if (!sshkey_type_is_cert(k->type))
2837: return SSH_ERR_KEY_TYPE_UNKNOWN;
2838: cert_free(k->cert);
2839: k->cert = NULL;
2840: k->type = sshkey_type_plain(k->type);
2841: return 0;
2842: }
2843:
2844: /* Sign a certified key, (re-)generating the signed certblob. */
2845: int
1.53 djm 2846: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.86 djm 2847: const char *sk_provider, sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2848: {
2849: struct sshbuf *principals = NULL;
2850: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2851: size_t i, ca_len, sig_len;
2852: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2853: struct sshbuf *cert = NULL;
2854: char *sigtype = NULL;
1.69 djm 2855: #ifdef WITH_OPENSSL
2856: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2857: #endif /* WITH_OPENSSL */
1.1 djm 2858:
2859: if (k == NULL || k->cert == NULL ||
2860: k->cert->certblob == NULL || ca == NULL)
2861: return SSH_ERR_INVALID_ARGUMENT;
2862: if (!sshkey_is_cert(k))
2863: return SSH_ERR_KEY_TYPE_UNKNOWN;
2864: if (!sshkey_type_is_valid_ca(ca->type))
2865: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2866:
1.67 djm 2867: /*
2868: * If no alg specified as argument but a signature_type was set,
2869: * then prefer that. If both were specified, then they must match.
2870: */
2871: if (alg == NULL)
2872: alg = k->cert->signature_type;
2873: else if (k->cert->signature_type != NULL &&
2874: strcmp(alg, k->cert->signature_type) != 0)
2875: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2876:
2877: /*
2878: * If no signing algorithm or signature_type was specified and we're
2879: * using a RSA key, then default to a good signature algorithm.
2880: */
2881: if (alg == NULL && ca->type == KEY_RSA)
2882: alg = "rsa-sha2-512";
1.67 djm 2883:
1.1 djm 2884: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2885: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2886:
2887: cert = k->cert->certblob; /* for readability */
2888: sshbuf_reset(cert);
2889: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2890: goto out;
2891:
2892: /* -v01 certs put nonce first */
2893: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2894: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2895: goto out;
1.1 djm 2896:
2897: /* XXX this substantially duplicates to_blob(); refactor */
2898: switch (k->type) {
2899: #ifdef WITH_OPENSSL
2900: case KEY_DSA_CERT:
1.69 djm 2901: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2902: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2903: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2904: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2905: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2906: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2907: goto out;
2908: break;
2909: case KEY_ECDSA_CERT:
1.85 djm 2910: case KEY_ECDSA_SK_CERT:
1.1 djm 2911: if ((ret = sshbuf_put_cstring(cert,
2912: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2913: (ret = sshbuf_put_ec(cert,
2914: EC_KEY_get0_public_key(k->ecdsa),
2915: EC_KEY_get0_group(k->ecdsa))) != 0)
2916: goto out;
1.85 djm 2917: if (k->type == KEY_ECDSA_SK_CERT) {
2918: if ((ret = sshbuf_put_cstring(cert,
2919: k->sk_application)) != 0)
2920: goto out;
2921: }
1.1 djm 2922: break;
2923: case KEY_RSA_CERT:
1.69 djm 2924: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2925: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2926: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2927: goto out;
2928: break;
2929: #endif /* WITH_OPENSSL */
2930: case KEY_ED25519_CERT:
2931: if ((ret = sshbuf_put_string(cert,
2932: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2933: goto out;
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: BN_CTX *bnctx;
3724: EC_POINT *nq = NULL;
3725: BIGNUM *order, *x, *y, *tmp;
3726: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3727:
3728: /*
3729: * NB. This assumes OpenSSL has already verified that the public
3730: * point lies on the curve. This is done by EC_POINT_oct2point()
3731: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3732: * reachable with public points not unmarshalled using
3733: * EC_POINT_oct2point then the caller will need to explicitly check.
3734: */
1.1 djm 3735:
3736: if ((bnctx = BN_CTX_new()) == NULL)
3737: return SSH_ERR_ALLOC_FAIL;
3738: BN_CTX_start(bnctx);
3739:
3740: /*
3741: * We shouldn't ever hit this case because bignum_get_ecpoint()
3742: * refuses to load GF2m points.
3743: */
3744: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3745: NID_X9_62_prime_field)
3746: goto out;
3747:
3748: /* Q != infinity */
3749: if (EC_POINT_is_at_infinity(group, public))
3750: goto out;
3751:
3752: if ((x = BN_CTX_get(bnctx)) == NULL ||
3753: (y = BN_CTX_get(bnctx)) == NULL ||
3754: (order = BN_CTX_get(bnctx)) == NULL ||
3755: (tmp = BN_CTX_get(bnctx)) == NULL) {
3756: ret = SSH_ERR_ALLOC_FAIL;
3757: goto out;
3758: }
3759:
3760: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3761: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3762: EC_POINT_get_affine_coordinates_GFp(group, public,
3763: x, y, bnctx) != 1) {
3764: ret = SSH_ERR_LIBCRYPTO_ERROR;
3765: goto out;
3766: }
3767: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3768: BN_num_bits(y) <= BN_num_bits(order) / 2)
3769: goto out;
3770:
3771: /* nQ == infinity (n == order of subgroup) */
3772: if ((nq = EC_POINT_new(group)) == NULL) {
3773: ret = SSH_ERR_ALLOC_FAIL;
3774: goto out;
3775: }
3776: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3777: ret = SSH_ERR_LIBCRYPTO_ERROR;
3778: goto out;
3779: }
3780: if (EC_POINT_is_at_infinity(group, nq) != 1)
3781: goto out;
3782:
3783: /* x < order - 1, y < order - 1 */
3784: if (!BN_sub(tmp, order, BN_value_one())) {
3785: ret = SSH_ERR_LIBCRYPTO_ERROR;
3786: goto out;
3787: }
3788: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3789: goto out;
3790: ret = 0;
3791: out:
3792: BN_CTX_free(bnctx);
1.60 jsing 3793: EC_POINT_free(nq);
1.1 djm 3794: return ret;
3795: }
3796:
3797: int
3798: sshkey_ec_validate_private(const EC_KEY *key)
3799: {
3800: BN_CTX *bnctx;
3801: BIGNUM *order, *tmp;
3802: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3803:
3804: if ((bnctx = BN_CTX_new()) == NULL)
3805: return SSH_ERR_ALLOC_FAIL;
3806: BN_CTX_start(bnctx);
3807:
3808: if ((order = BN_CTX_get(bnctx)) == NULL ||
3809: (tmp = BN_CTX_get(bnctx)) == NULL) {
3810: ret = SSH_ERR_ALLOC_FAIL;
3811: goto out;
3812: }
3813:
3814: /* log2(private) > log2(order)/2 */
3815: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3816: ret = SSH_ERR_LIBCRYPTO_ERROR;
3817: goto out;
3818: }
3819: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3820: BN_num_bits(order) / 2)
3821: goto out;
3822:
3823: /* private < order - 1 */
3824: if (!BN_sub(tmp, order, BN_value_one())) {
3825: ret = SSH_ERR_LIBCRYPTO_ERROR;
3826: goto out;
3827: }
3828: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3829: goto out;
3830: ret = 0;
3831: out:
3832: BN_CTX_free(bnctx);
3833: return ret;
3834: }
3835:
3836: void
3837: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3838: {
3839: BIGNUM *x, *y;
3840: BN_CTX *bnctx;
3841:
3842: if (point == NULL) {
3843: fputs("point=(NULL)\n", stderr);
3844: return;
3845: }
3846: if ((bnctx = BN_CTX_new()) == NULL) {
3847: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3848: return;
3849: }
3850: BN_CTX_start(bnctx);
3851: if ((x = BN_CTX_get(bnctx)) == NULL ||
3852: (y = BN_CTX_get(bnctx)) == NULL) {
3853: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3854: return;
3855: }
3856: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3857: NID_X9_62_prime_field) {
3858: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3859: return;
3860: }
3861: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3862: bnctx) != 1) {
3863: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3864: __func__);
3865: return;
3866: }
3867: fputs("x=", stderr);
3868: BN_print_fp(stderr, x);
3869: fputs("\ny=", stderr);
3870: BN_print_fp(stderr, y);
3871: fputs("\n", stderr);
3872: BN_CTX_free(bnctx);
3873: }
3874:
3875: void
3876: sshkey_dump_ec_key(const EC_KEY *key)
3877: {
3878: const BIGNUM *exponent;
3879:
3880: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3881: EC_KEY_get0_public_key(key));
3882: fputs("exponent=", stderr);
3883: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3884: fputs("(NULL)", stderr);
3885: else
3886: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3887: fputs("\n", stderr);
3888: }
3889: #endif /* WITH_OPENSSL */
3890:
3891: static int
1.76 djm 3892: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3893: const char *passphrase, const char *comment, const char *ciphername,
3894: int rounds)
3895: {
1.4 djm 3896: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3897: u_char salt[SALT_LEN];
1.4 djm 3898: char *b64 = NULL;
1.1 djm 3899: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3900: u_int check;
3901: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3902: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3903: const struct sshcipher *cipher;
3904: const char *kdfname = KDFNAME;
3905: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3906:
3907: if (rounds <= 0)
3908: rounds = DEFAULT_ROUNDS;
3909: if (passphrase == NULL || !strlen(passphrase)) {
3910: ciphername = "none";
3911: kdfname = "none";
3912: } else if (ciphername == NULL)
3913: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3914: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3915: r = SSH_ERR_INVALID_ARGUMENT;
3916: goto out;
3917: }
3918:
3919: if ((kdf = sshbuf_new()) == NULL ||
3920: (encoded = sshbuf_new()) == NULL ||
3921: (encrypted = sshbuf_new()) == NULL) {
3922: r = SSH_ERR_ALLOC_FAIL;
3923: goto out;
3924: }
3925: blocksize = cipher_blocksize(cipher);
3926: keylen = cipher_keylen(cipher);
3927: ivlen = cipher_ivlen(cipher);
3928: authlen = cipher_authlen(cipher);
3929: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3930: r = SSH_ERR_ALLOC_FAIL;
3931: goto out;
3932: }
3933: if (strcmp(kdfname, "bcrypt") == 0) {
3934: arc4random_buf(salt, SALT_LEN);
3935: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3936: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3937: r = SSH_ERR_INVALID_ARGUMENT;
3938: goto out;
3939: }
3940: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3941: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3942: goto out;
3943: } else if (strcmp(kdfname, "none") != 0) {
3944: /* Unsupported KDF type */
3945: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3946: goto out;
3947: }
3948: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3949: key + keylen, ivlen, 1)) != 0)
3950: goto out;
3951:
3952: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3953: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3954: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3955: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3956: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3957: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3958: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3959: goto out;
3960:
3961: /* set up the buffer that will be encrypted */
3962:
3963: /* Random check bytes */
3964: check = arc4random();
3965: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3966: (r = sshbuf_put_u32(encrypted, check)) != 0)
3967: goto out;
3968:
3969: /* append private key and comment*/
1.62 markus 3970: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3971: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3972: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3973: goto out;
3974:
3975: /* padding */
3976: i = 0;
3977: while (sshbuf_len(encrypted) % blocksize) {
3978: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3979: goto out;
3980: }
3981:
3982: /* length in destination buffer */
3983: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3984: goto out;
3985:
3986: /* encrypt */
3987: if ((r = sshbuf_reserve(encoded,
3988: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3989: goto out;
1.36 djm 3990: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3991: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3992: goto out;
3993:
1.81 djm 3994: sshbuf_reset(blob);
1.1 djm 3995:
1.81 djm 3996: /* assemble uuencoded key */
3997: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3998: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3999: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 4000: goto out;
4001:
4002: /* success */
4003: r = 0;
4004:
4005: out:
4006: sshbuf_free(kdf);
4007: sshbuf_free(encoded);
4008: sshbuf_free(encrypted);
1.36 djm 4009: cipher_free(ciphercontext);
1.1 djm 4010: explicit_bzero(salt, sizeof(salt));
4011: if (key != NULL) {
4012: explicit_bzero(key, keylen + ivlen);
4013: free(key);
4014: }
4015: if (pubkeyblob != NULL) {
4016: explicit_bzero(pubkeyblob, pubkeylen);
4017: free(pubkeyblob);
4018: }
4019: if (b64 != NULL) {
4020: explicit_bzero(b64, strlen(b64));
4021: free(b64);
4022: }
4023: return r;
4024: }
4025:
4026: static int
4027: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
4028: struct sshkey **keyp, char **commentp)
4029: {
4030: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
4031: const struct sshcipher *cipher = NULL;
4032: const u_char *cp;
4033: int r = SSH_ERR_INTERNAL_ERROR;
4034: size_t encoded_len;
1.18 djm 4035: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 4036: struct sshbuf *encoded = NULL, *decoded = NULL;
4037: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 4038: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 4039: struct sshkey *k = NULL;
4040: u_char *key = NULL, *salt = NULL, *dp, pad, last;
4041: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
4042:
4043: if (keyp != NULL)
4044: *keyp = NULL;
4045: if (commentp != NULL)
4046: *commentp = NULL;
4047:
4048: if ((encoded = sshbuf_new()) == NULL ||
4049: (decoded = sshbuf_new()) == NULL ||
4050: (decrypted = sshbuf_new()) == NULL) {
4051: r = SSH_ERR_ALLOC_FAIL;
4052: goto out;
4053: }
4054:
4055: /* check preamble */
4056: cp = sshbuf_ptr(blob);
4057: encoded_len = sshbuf_len(blob);
4058: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
4059: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
4060: r = SSH_ERR_INVALID_FORMAT;
4061: goto out;
4062: }
4063: cp += MARK_BEGIN_LEN;
4064: encoded_len -= MARK_BEGIN_LEN;
4065:
4066: /* Look for end marker, removing whitespace as we go */
4067: while (encoded_len > 0) {
4068: if (*cp != '\n' && *cp != '\r') {
4069: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
4070: goto out;
4071: }
4072: last = *cp;
4073: encoded_len--;
4074: cp++;
4075: if (last == '\n') {
4076: if (encoded_len >= MARK_END_LEN &&
4077: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
4078: /* \0 terminate */
4079: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
4080: goto out;
4081: break;
4082: }
4083: }
4084: }
4085: if (encoded_len == 0) {
4086: r = SSH_ERR_INVALID_FORMAT;
4087: goto out;
4088: }
4089:
4090: /* decode base64 */
1.4 djm 4091: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 4092: goto out;
4093:
4094: /* check magic */
4095: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
4096: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
4097: r = SSH_ERR_INVALID_FORMAT;
4098: goto out;
4099: }
4100: /* parse public portion of key */
4101: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
4102: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
4103: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
4104: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
4105: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
4106: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
4107: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
4108: goto out;
4109:
4110: if ((cipher = cipher_by_name(ciphername)) == NULL) {
4111: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4112: goto out;
4113: }
4114: if ((passphrase == NULL || strlen(passphrase) == 0) &&
4115: strcmp(ciphername, "none") != 0) {
4116: /* passphrase required */
4117: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4118: goto out;
4119: }
4120: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
4121: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4122: goto out;
4123: }
4124: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
4125: r = SSH_ERR_INVALID_FORMAT;
4126: goto out;
4127: }
4128: if (nkeys != 1) {
4129: /* XXX only one key supported */
4130: r = SSH_ERR_INVALID_FORMAT;
4131: goto out;
4132: }
4133:
4134: /* check size of encrypted key blob */
4135: blocksize = cipher_blocksize(cipher);
4136: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
4137: r = SSH_ERR_INVALID_FORMAT;
4138: goto out;
4139: }
4140:
4141: /* setup key */
4142: keylen = cipher_keylen(cipher);
4143: ivlen = cipher_ivlen(cipher);
1.18 djm 4144: authlen = cipher_authlen(cipher);
1.1 djm 4145: if ((key = calloc(1, keylen + ivlen)) == NULL) {
4146: r = SSH_ERR_ALLOC_FAIL;
4147: goto out;
4148: }
4149: if (strcmp(kdfname, "bcrypt") == 0) {
4150: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4151: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4152: goto out;
4153: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4154: key, keylen + ivlen, rounds) < 0) {
4155: r = SSH_ERR_INVALID_FORMAT;
4156: goto out;
4157: }
4158: }
4159:
1.18 djm 4160: /* check that an appropriate amount of auth data is present */
1.84 djm 4161: if (sshbuf_len(decoded) < authlen ||
4162: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4163: r = SSH_ERR_INVALID_FORMAT;
4164: goto out;
4165: }
4166:
1.1 djm 4167: /* decrypt private portion of key */
4168: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4169: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4170: key + keylen, ivlen, 0)) != 0)
4171: goto out;
1.36 djm 4172: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4173: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4174: /* an integrity error here indicates an incorrect passphrase */
4175: if (r == SSH_ERR_MAC_INVALID)
4176: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4177: goto out;
4178: }
1.18 djm 4179: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4180: goto out;
4181: /* there should be no trailing data */
4182: if (sshbuf_len(decoded) != 0) {
4183: r = SSH_ERR_INVALID_FORMAT;
4184: goto out;
4185: }
4186:
4187: /* check check bytes */
4188: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4189: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4190: goto out;
4191: if (check1 != check2) {
4192: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4193: goto out;
4194: }
4195:
4196: /* Load the private key and comment */
4197: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4198: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4199: goto out;
4200:
4201: /* Check deterministic padding */
4202: i = 0;
4203: while (sshbuf_len(decrypted)) {
4204: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
4205: goto out;
4206: if (pad != (++i & 0xff)) {
4207: r = SSH_ERR_INVALID_FORMAT;
4208: goto out;
4209: }
4210: }
4211:
4212: /* XXX decode pubkey and check against private */
4213:
4214: /* success */
4215: r = 0;
4216: if (keyp != NULL) {
4217: *keyp = k;
4218: k = NULL;
4219: }
4220: if (commentp != NULL) {
4221: *commentp = comment;
4222: comment = NULL;
4223: }
4224: out:
4225: pad = 0;
1.36 djm 4226: cipher_free(ciphercontext);
1.1 djm 4227: free(ciphername);
4228: free(kdfname);
4229: free(comment);
4230: if (salt != NULL) {
4231: explicit_bzero(salt, slen);
4232: free(salt);
4233: }
4234: if (key != NULL) {
4235: explicit_bzero(key, keylen + ivlen);
4236: free(key);
4237: }
4238: sshbuf_free(encoded);
4239: sshbuf_free(decoded);
4240: sshbuf_free(kdf);
4241: sshbuf_free(decrypted);
4242: sshkey_free(k);
4243: return r;
4244: }
4245:
4246:
4247: #ifdef WITH_OPENSSL
1.80 djm 4248: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4249: static int
1.80 djm 4250: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4251: int format, const char *_passphrase, const char *comment)
1.1 djm 4252: {
1.76 djm 4253: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4254: int success, r;
4255: int blen, len = strlen(_passphrase);
4256: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4257: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4258: char *bptr;
1.1 djm 4259: BIO *bio = NULL;
1.76 djm 4260: struct sshbuf *blob;
1.80 djm 4261: EVP_PKEY *pkey = NULL;
1.1 djm 4262:
4263: if (len > 0 && len <= 4)
4264: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4265: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4266: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4267: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4268: r = SSH_ERR_ALLOC_FAIL;
4269: goto out;
4270: }
4271: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4272: r = SSH_ERR_ALLOC_FAIL;
4273: goto out;
1.76 djm 4274: }
4275: if ((r = sshkey_unshield_private(key)) != 0)
4276: goto out;
1.1 djm 4277:
4278: switch (key->type) {
4279: case KEY_DSA:
1.80 djm 4280: if (format == SSHKEY_PRIVATE_PEM) {
4281: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4282: cipher, passphrase, len, NULL, NULL);
4283: } else {
4284: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4285: }
1.1 djm 4286: break;
4287: case KEY_ECDSA:
1.80 djm 4288: if (format == SSHKEY_PRIVATE_PEM) {
4289: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4290: cipher, passphrase, len, NULL, NULL);
4291: } else {
4292: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4293: }
1.1 djm 4294: break;
4295: case KEY_RSA:
1.80 djm 4296: if (format == SSHKEY_PRIVATE_PEM) {
4297: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4298: cipher, passphrase, len, NULL, NULL);
4299: } else {
4300: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4301: }
1.1 djm 4302: break;
4303: default:
4304: success = 0;
4305: break;
4306: }
4307: if (success == 0) {
4308: r = SSH_ERR_LIBCRYPTO_ERROR;
4309: goto out;
4310: }
1.80 djm 4311: if (format == SSHKEY_PRIVATE_PKCS8) {
4312: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4313: passphrase, len, NULL, NULL)) == 0) {
4314: r = SSH_ERR_LIBCRYPTO_ERROR;
4315: goto out;
4316: }
4317: }
1.1 djm 4318: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4319: r = SSH_ERR_INTERNAL_ERROR;
4320: goto out;
4321: }
4322: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4323: goto out;
4324: r = 0;
4325: out:
1.76 djm 4326: if (was_shielded)
4327: r = sshkey_shield_private(key);
4328: if (r == 0)
4329: r = sshbuf_putb(buf, blob);
1.80 djm 4330:
4331: EVP_PKEY_free(pkey);
1.76 djm 4332: sshbuf_free(blob);
1.1 djm 4333: BIO_free(bio);
4334: return r;
4335: }
4336: #endif /* WITH_OPENSSL */
4337:
4338: /* Serialise "key" to buffer "blob" */
4339: int
4340: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4341: const char *passphrase, const char *comment,
1.80 djm 4342: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4343: {
4344: switch (key->type) {
1.9 markus 4345: #ifdef WITH_OPENSSL
1.1 djm 4346: case KEY_DSA:
4347: case KEY_ECDSA:
4348: case KEY_RSA:
1.80 djm 4349: break; /* see below */
1.1 djm 4350: #endif /* WITH_OPENSSL */
4351: case KEY_ED25519:
1.90 markus 4352: case KEY_ED25519_SK:
1.62 markus 4353: #ifdef WITH_XMSS
4354: case KEY_XMSS:
4355: #endif /* WITH_XMSS */
1.85 djm 4356: #ifdef WITH_OPENSSL
4357: case KEY_ECDSA_SK:
4358: #endif /* WITH_OPENSSL */
1.1 djm 4359: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4360: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4361: default:
4362: return SSH_ERR_KEY_TYPE_UNKNOWN;
4363: }
1.80 djm 4364:
4365: #ifdef WITH_OPENSSL
4366: switch (format) {
4367: case SSHKEY_PRIVATE_OPENSSH:
4368: return sshkey_private_to_blob2(key, blob, passphrase,
4369: comment, openssh_format_cipher, openssh_format_rounds);
4370: case SSHKEY_PRIVATE_PEM:
4371: case SSHKEY_PRIVATE_PKCS8:
4372: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4373: format, passphrase, comment);
4374: default:
4375: return SSH_ERR_INVALID_ARGUMENT;
4376: }
4377: #endif /* WITH_OPENSSL */
1.1 djm 4378: }
4379:
4380: #ifdef WITH_OPENSSL
1.8 djm 4381: static int
1.52 djm 4382: translate_libcrypto_error(unsigned long pem_err)
4383: {
4384: int pem_reason = ERR_GET_REASON(pem_err);
4385:
4386: switch (ERR_GET_LIB(pem_err)) {
4387: case ERR_LIB_PEM:
4388: switch (pem_reason) {
4389: case PEM_R_BAD_PASSWORD_READ:
4390: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4391: case PEM_R_BAD_DECRYPT:
4392: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4393: default:
4394: return SSH_ERR_INVALID_FORMAT;
4395: }
4396: case ERR_LIB_EVP:
4397: switch (pem_reason) {
4398: case EVP_R_BAD_DECRYPT:
4399: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4400: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4401: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4402: #endif
1.52 djm 4403: case EVP_R_DECODE_ERROR:
4404: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4405: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4406: #endif
4407: return SSH_ERR_INVALID_FORMAT;
4408: default:
4409: return SSH_ERR_LIBCRYPTO_ERROR;
4410: }
4411: case ERR_LIB_ASN1:
4412: return SSH_ERR_INVALID_FORMAT;
4413: }
4414: return SSH_ERR_LIBCRYPTO_ERROR;
4415: }
4416:
4417: static void
4418: clear_libcrypto_errors(void)
4419: {
4420: while (ERR_get_error() != 0)
4421: ;
4422: }
4423:
4424: /*
4425: * Translate OpenSSL error codes to determine whether
4426: * passphrase is required/incorrect.
4427: */
4428: static int
4429: convert_libcrypto_error(void)
4430: {
4431: /*
4432: * Some password errors are reported at the beginning
4433: * of the error queue.
4434: */
4435: if (translate_libcrypto_error(ERR_peek_error()) ==
4436: SSH_ERR_KEY_WRONG_PASSPHRASE)
4437: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4438: return translate_libcrypto_error(ERR_peek_last_error());
4439: }
4440:
4441: static int
1.1 djm 4442: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4443: const char *passphrase, struct sshkey **keyp)
1.1 djm 4444: {
4445: EVP_PKEY *pk = NULL;
4446: struct sshkey *prv = NULL;
4447: BIO *bio = NULL;
4448: int r;
4449:
1.32 djm 4450: if (keyp != NULL)
4451: *keyp = NULL;
1.1 djm 4452:
4453: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4454: return SSH_ERR_ALLOC_FAIL;
4455: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4456: (int)sshbuf_len(blob)) {
4457: r = SSH_ERR_ALLOC_FAIL;
4458: goto out;
4459: }
4460:
1.52 djm 4461: clear_libcrypto_errors();
1.1 djm 4462: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4463: (char *)passphrase)) == NULL) {
1.71 djm 4464: /*
4465: * libcrypto may return various ASN.1 errors when attempting
4466: * to parse a key with an incorrect passphrase.
4467: * Treat all format errors as "incorrect passphrase" if a
4468: * passphrase was supplied.
4469: */
4470: if (passphrase != NULL && *passphrase != '\0')
4471: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4472: else
4473: r = convert_libcrypto_error();
1.1 djm 4474: goto out;
4475: }
1.69 djm 4476: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4477: (type == KEY_UNSPEC || type == KEY_RSA)) {
4478: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4479: r = SSH_ERR_ALLOC_FAIL;
4480: goto out;
4481: }
4482: prv->rsa = EVP_PKEY_get1_RSA(pk);
4483: prv->type = KEY_RSA;
4484: #ifdef DEBUG_PK
4485: RSA_print_fp(stderr, prv->rsa, 8);
4486: #endif
4487: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4488: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4489: goto out;
4490: }
1.69 djm 4491: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4492: goto out;
1.69 djm 4493: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4494: (type == KEY_UNSPEC || type == KEY_DSA)) {
4495: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4496: r = SSH_ERR_ALLOC_FAIL;
4497: goto out;
4498: }
4499: prv->dsa = EVP_PKEY_get1_DSA(pk);
4500: prv->type = KEY_DSA;
4501: #ifdef DEBUG_PK
4502: DSA_print_fp(stderr, prv->dsa, 8);
4503: #endif
1.69 djm 4504: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4505: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4506: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4507: r = SSH_ERR_ALLOC_FAIL;
4508: goto out;
4509: }
4510: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4511: prv->type = KEY_ECDSA;
4512: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4513: if (prv->ecdsa_nid == -1 ||
4514: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4515: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4516: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4517: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4518: r = SSH_ERR_INVALID_FORMAT;
4519: goto out;
4520: }
4521: #ifdef DEBUG_PK
4522: if (prv != NULL && prv->ecdsa != NULL)
4523: sshkey_dump_ec_key(prv->ecdsa);
4524: #endif
4525: } else {
4526: r = SSH_ERR_INVALID_FORMAT;
4527: goto out;
4528: }
4529: r = 0;
1.32 djm 4530: if (keyp != NULL) {
4531: *keyp = prv;
4532: prv = NULL;
4533: }
1.1 djm 4534: out:
4535: BIO_free(bio);
1.60 jsing 4536: EVP_PKEY_free(pk);
1.30 mmcc 4537: sshkey_free(prv);
1.1 djm 4538: return r;
4539: }
4540: #endif /* WITH_OPENSSL */
4541:
4542: int
4543: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4544: const char *passphrase, struct sshkey **keyp, char **commentp)
4545: {
1.42 djm 4546: int r = SSH_ERR_INTERNAL_ERROR;
4547:
1.32 djm 4548: if (keyp != NULL)
4549: *keyp = NULL;
1.1 djm 4550: if (commentp != NULL)
4551: *commentp = NULL;
4552:
4553: switch (type) {
1.9 markus 4554: #ifdef WITH_OPENSSL
1.1 djm 4555: case KEY_DSA:
4556: case KEY_ECDSA:
4557: case KEY_RSA:
1.8 djm 4558: return sshkey_parse_private_pem_fileblob(blob, type,
4559: passphrase, keyp);
1.1 djm 4560: #endif /* WITH_OPENSSL */
4561: case KEY_ED25519:
1.62 markus 4562: #ifdef WITH_XMSS
4563: case KEY_XMSS:
4564: #endif /* WITH_XMSS */
1.1 djm 4565: return sshkey_parse_private2(blob, type, passphrase,
4566: keyp, commentp);
4567: case KEY_UNSPEC:
1.42 djm 4568: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4569: commentp);
4570: /* Do not fallback to PEM parser if only passphrase is wrong. */
4571: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4572: return r;
1.1 djm 4573: #ifdef WITH_OPENSSL
1.8 djm 4574: return sshkey_parse_private_pem_fileblob(blob, type,
4575: passphrase, keyp);
1.1 djm 4576: #else
4577: return SSH_ERR_INVALID_FORMAT;
4578: #endif /* WITH_OPENSSL */
4579: default:
4580: return SSH_ERR_KEY_TYPE_UNKNOWN;
4581: }
4582: }
4583:
4584: int
4585: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4586: struct sshkey **keyp, char **commentp)
1.1 djm 4587: {
4588: if (keyp != NULL)
4589: *keyp = NULL;
4590: if (commentp != NULL)
4591: *commentp = NULL;
4592:
1.23 tim 4593: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4594: passphrase, keyp, commentp);
1.1 djm 4595: }
1.62 markus 4596:
4597: #ifdef WITH_XMSS
4598: /*
4599: * serialize the key with the current state and forward the state
4600: * maxsign times.
4601: */
4602: int
1.77 djm 4603: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4604: u_int32_t maxsign, sshkey_printfn *pr)
4605: {
4606: int r, rupdate;
4607:
4608: if (maxsign == 0 ||
4609: sshkey_type_plain(k->type) != KEY_XMSS)
4610: return sshkey_private_serialize_opt(k, b,
4611: SSHKEY_SERIALIZE_DEFAULT);
4612: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4613: (r = sshkey_private_serialize_opt(k, b,
4614: SSHKEY_SERIALIZE_STATE)) != 0 ||
4615: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4616: goto out;
4617: r = 0;
4618: out:
4619: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4620: if (r == 0)
4621: r = rupdate;
4622: }
4623: return r;
4624: }
4625:
4626: u_int32_t
4627: sshkey_signatures_left(const struct sshkey *k)
4628: {
4629: if (sshkey_type_plain(k->type) == KEY_XMSS)
4630: return sshkey_xmss_signatures_left(k);
4631: return 0;
4632: }
4633:
4634: int
4635: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4636: {
4637: if (sshkey_type_plain(k->type) != KEY_XMSS)
4638: return SSH_ERR_INVALID_ARGUMENT;
4639: return sshkey_xmss_enable_maxsign(k, maxsign);
4640: }
4641:
4642: int
4643: sshkey_set_filename(struct sshkey *k, const char *filename)
4644: {
4645: if (k == NULL)
4646: return SSH_ERR_INVALID_ARGUMENT;
4647: if (sshkey_type_plain(k->type) != KEY_XMSS)
4648: return 0;
4649: if (filename == NULL)
4650: return SSH_ERR_INVALID_ARGUMENT;
4651: if ((k->xmss_filename = strdup(filename)) == NULL)
4652: return SSH_ERR_ALLOC_FAIL;
4653: return 0;
4654: }
4655: #else
4656: int
1.76 djm 4657: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4658: u_int32_t maxsign, sshkey_printfn *pr)
4659: {
4660: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4661: }
4662:
4663: u_int32_t
4664: sshkey_signatures_left(const struct sshkey *k)
4665: {
4666: return 0;
4667: }
4668:
4669: int
4670: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4671: {
4672: return SSH_ERR_INVALID_ARGUMENT;
4673: }
4674:
4675: int
4676: sshkey_set_filename(struct sshkey *k, const char *filename)
4677: {
4678: if (k == NULL)
4679: return SSH_ERR_INVALID_ARGUMENT;
4680: return 0;
4681: }
4682: #endif /* WITH_XMSS */
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