Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.92
1.92 ! markus 1: /* $OpenBSD: sshkey.c,v 1.91 2019/11/13 07:53:10 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) {
1.92 ! markus 1913: u_int32_t left;
1.62 markus 1914: size_t pklen = sshkey_xmss_pklen(k);
1915: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1916: r = SSH_ERR_INTERNAL_ERROR;
1917: goto out;
1.62 markus 1918: }
1919: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1920: r = SSH_ERR_ALLOC_FAIL;
1921: goto out;
1.62 markus 1922: }
1923: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1.92 ! markus 1924: /* simulate number of signatures left on pubkey */
! 1925: left = sshkey_xmss_signatures_left(k);
! 1926: if (left)
! 1927: sshkey_xmss_enable_maxsign(n, left);
1.62 markus 1928: }
1929: break;
1930: #endif /* WITH_XMSS */
1.1 djm 1931: default:
1.69 djm 1932: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1933: goto out;
1.1 djm 1934: }
1.69 djm 1935: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1936: goto out;
1937: /* success */
1.1 djm 1938: *pkp = n;
1.69 djm 1939: n = NULL;
1940: r = 0;
1941: out:
1942: sshkey_free(n);
1.83 djm 1943: #ifdef WITH_OPENSSL
1.69 djm 1944: BN_clear_free(rsa_n_dup);
1945: BN_clear_free(rsa_e_dup);
1946: BN_clear_free(dsa_p_dup);
1947: BN_clear_free(dsa_q_dup);
1948: BN_clear_free(dsa_g_dup);
1949: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1950: #endif /* WITH_OPENSSL */
1.69 djm 1951:
1952: return r;
1.1 djm 1953: }
1954:
1.76 djm 1955: int
1956: sshkey_is_shielded(struct sshkey *k)
1957: {
1958: return k != NULL && k->shielded_private != NULL;
1959: }
1960:
1961: int
1962: sshkey_shield_private(struct sshkey *k)
1963: {
1964: struct sshbuf *prvbuf = NULL;
1965: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1966: struct sshcipher_ctx *cctx = NULL;
1967: const struct sshcipher *cipher;
1968: size_t i, enclen = 0;
1969: struct sshkey *kswap = NULL, tmp;
1970: int r = SSH_ERR_INTERNAL_ERROR;
1971:
1972: #ifdef DEBUG_PK
1973: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1974: #endif
1975: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1976: r = SSH_ERR_INVALID_ARGUMENT;
1977: goto out;
1978: }
1979: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1980: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1981: r = SSH_ERR_INTERNAL_ERROR;
1982: goto out;
1983: }
1984:
1985: /* Prepare a random pre-key, and from it an ephemeral key */
1986: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1987: r = SSH_ERR_ALLOC_FAIL;
1988: goto out;
1989: }
1990: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1991: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1992: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1993: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1994: goto out;
1995: #ifdef DEBUG_PK
1996: fprintf(stderr, "%s: key+iv\n", __func__);
1997: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1998: stderr);
1999: #endif
2000: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2001: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
2002: goto out;
2003:
2004: /* Serialise and encrypt the private key using the ephemeral key */
2005: if ((prvbuf = sshbuf_new()) == NULL) {
2006: r = SSH_ERR_ALLOC_FAIL;
2007: goto out;
2008: }
2009: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
2010: goto out;
2011: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1.91 markus 2012: SSHKEY_SERIALIZE_SHIELD)) != 0)
1.76 djm 2013: goto out;
2014: /* pad to cipher blocksize */
2015: i = 0;
2016: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
2017: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
2018: goto out;
2019: }
2020: #ifdef DEBUG_PK
2021: fprintf(stderr, "%s: serialised\n", __func__);
2022: sshbuf_dump(prvbuf, stderr);
2023: #endif
2024: /* encrypt */
2025: enclen = sshbuf_len(prvbuf);
2026: if ((enc = malloc(enclen)) == NULL) {
2027: r = SSH_ERR_ALLOC_FAIL;
2028: goto out;
2029: }
2030: if ((r = cipher_crypt(cctx, 0, enc,
2031: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
2032: goto out;
2033: #ifdef DEBUG_PK
2034: fprintf(stderr, "%s: encrypted\n", __func__);
2035: sshbuf_dump_data(enc, enclen, stderr);
2036: #endif
2037:
2038: /* Make a scrubbed, public-only copy of our private key argument */
2039: if ((r = sshkey_from_private(k, &kswap)) != 0)
2040: goto out;
2041:
2042: /* Swap the private key out (it will be destroyed below) */
2043: tmp = *kswap;
2044: *kswap = *k;
2045: *k = tmp;
2046:
2047: /* Insert the shielded key into our argument */
2048: k->shielded_private = enc;
2049: k->shielded_len = enclen;
2050: k->shield_prekey = prekey;
2051: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
2052: enc = prekey = NULL; /* transferred */
2053: enclen = 0;
2054:
2055: /* success */
2056: r = 0;
2057:
2058: out:
2059: /* XXX behaviour on error - invalidate original private key? */
2060: cipher_free(cctx);
2061: explicit_bzero(keyiv, sizeof(keyiv));
2062: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 2063: freezero(enc, enclen);
1.76 djm 2064: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
2065: sshkey_free(kswap);
2066: sshbuf_free(prvbuf);
2067: return r;
2068: }
2069:
2070: int
2071: sshkey_unshield_private(struct sshkey *k)
2072: {
2073: struct sshbuf *prvbuf = NULL;
2074: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
2075: struct sshcipher_ctx *cctx = NULL;
2076: const struct sshcipher *cipher;
2077: size_t i;
2078: struct sshkey *kswap = NULL, tmp;
2079: int r = SSH_ERR_INTERNAL_ERROR;
2080:
2081: #ifdef DEBUG_PK
2082: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
2083: #endif
2084: if (!sshkey_is_shielded(k))
2085: return 0; /* nothing to do */
2086:
2087: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
2088: r = SSH_ERR_INVALID_ARGUMENT;
2089: goto out;
2090: }
2091: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
2092: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
2093: r = SSH_ERR_INTERNAL_ERROR;
2094: goto out;
2095: }
2096: /* check size of shielded key blob */
2097: if (k->shielded_len < cipher_blocksize(cipher) ||
2098: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
2099: r = SSH_ERR_INVALID_FORMAT;
2100: goto out;
2101: }
2102:
2103: /* Calculate the ephemeral key from the prekey */
2104: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2105: k->shield_prekey, k->shield_prekey_len,
2106: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2107: goto out;
2108: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2109: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2110: goto out;
2111: #ifdef DEBUG_PK
2112: fprintf(stderr, "%s: key+iv\n", __func__);
2113: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2114: stderr);
2115: #endif
2116:
2117: /* Decrypt and parse the shielded private key using the ephemeral key */
2118: if ((prvbuf = sshbuf_new()) == NULL) {
2119: r = SSH_ERR_ALLOC_FAIL;
2120: goto out;
2121: }
2122: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2123: goto out;
2124: /* decrypt */
2125: #ifdef DEBUG_PK
2126: fprintf(stderr, "%s: encrypted\n", __func__);
2127: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2128: #endif
2129: if ((r = cipher_crypt(cctx, 0, cp,
2130: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2131: goto out;
2132: #ifdef DEBUG_PK
2133: fprintf(stderr, "%s: serialised\n", __func__);
2134: sshbuf_dump(prvbuf, stderr);
2135: #endif
2136: /* Parse private key */
2137: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2138: goto out;
2139: /* Check deterministic padding */
2140: i = 0;
2141: while (sshbuf_len(prvbuf)) {
2142: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2143: goto out;
2144: if (pad != (++i & 0xff)) {
2145: r = SSH_ERR_INVALID_FORMAT;
2146: goto out;
2147: }
2148: }
2149:
2150: /* Swap the parsed key back into place */
2151: tmp = *kswap;
2152: *kswap = *k;
2153: *k = tmp;
2154:
2155: /* success */
2156: r = 0;
2157:
2158: out:
2159: cipher_free(cctx);
2160: explicit_bzero(keyiv, sizeof(keyiv));
2161: explicit_bzero(&tmp, sizeof(tmp));
2162: sshkey_free(kswap);
2163: sshbuf_free(prvbuf);
2164: return r;
2165: }
2166:
1.1 djm 2167: static int
1.14 djm 2168: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2169: {
1.14 djm 2170: struct sshbuf *principals = NULL, *crit = NULL;
2171: struct sshbuf *exts = NULL, *ca = NULL;
2172: u_char *sig = NULL;
2173: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2174: int ret = SSH_ERR_INTERNAL_ERROR;
2175:
2176: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2177: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2178: return ret;
2179:
1.20 djm 2180: /* Parse body of certificate up to signature */
2181: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2182: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2183: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2184: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2185: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2186: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2187: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2188: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2189: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2190: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2191: /* XXX debug print error for ret */
2192: ret = SSH_ERR_INVALID_FORMAT;
2193: goto out;
2194: }
2195:
2196: /* Signature is left in the buffer so we can calculate this length */
2197: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2198:
2199: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2200: ret = SSH_ERR_INVALID_FORMAT;
2201: goto out;
2202: }
2203:
2204: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2205: key->cert->type != SSH2_CERT_TYPE_HOST) {
2206: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2207: goto out;
2208: }
2209:
1.4 djm 2210: /* Parse principals section */
2211: while (sshbuf_len(principals) > 0) {
2212: char *principal = NULL;
2213: char **oprincipals = NULL;
2214:
1.1 djm 2215: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2216: ret = SSH_ERR_INVALID_FORMAT;
2217: goto out;
2218: }
1.4 djm 2219: if ((ret = sshbuf_get_cstring(principals, &principal,
2220: NULL)) != 0) {
1.1 djm 2221: ret = SSH_ERR_INVALID_FORMAT;
2222: goto out;
2223: }
2224: oprincipals = key->cert->principals;
1.51 deraadt 2225: key->cert->principals = recallocarray(key->cert->principals,
2226: key->cert->nprincipals, key->cert->nprincipals + 1,
2227: sizeof(*key->cert->principals));
1.1 djm 2228: if (key->cert->principals == NULL) {
2229: free(principal);
2230: key->cert->principals = oprincipals;
2231: ret = SSH_ERR_ALLOC_FAIL;
2232: goto out;
2233: }
2234: key->cert->principals[key->cert->nprincipals++] = principal;
2235: }
2236:
1.4 djm 2237: /*
2238: * Stash a copies of the critical options and extensions sections
2239: * for later use.
2240: */
2241: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2242: (exts != NULL &&
2243: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2244: goto out;
2245:
1.4 djm 2246: /*
2247: * Validate critical options and extensions sections format.
2248: */
2249: while (sshbuf_len(crit) != 0) {
2250: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2251: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2252: sshbuf_reset(key->cert->critical);
1.1 djm 2253: ret = SSH_ERR_INVALID_FORMAT;
2254: goto out;
2255: }
2256: }
1.4 djm 2257: while (exts != NULL && sshbuf_len(exts) != 0) {
2258: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2259: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2260: sshbuf_reset(key->cert->extensions);
1.1 djm 2261: ret = SSH_ERR_INVALID_FORMAT;
2262: goto out;
2263: }
2264: }
2265:
1.4 djm 2266: /* Parse CA key and check signature */
1.14 djm 2267: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2268: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2269: goto out;
2270: }
2271: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2272: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2273: goto out;
2274: }
2275: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 2276: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 2277: goto out;
1.82 djm 2278: if ((ret = sshkey_get_sigtype(sig, slen,
2279: &key->cert->signature_type)) != 0)
1.67 djm 2280: goto out;
1.4 djm 2281:
2282: /* Success */
1.1 djm 2283: ret = 0;
2284: out:
1.14 djm 2285: sshbuf_free(ca);
1.4 djm 2286: sshbuf_free(crit);
2287: sshbuf_free(exts);
2288: sshbuf_free(principals);
1.1 djm 2289: free(sig);
2290: return ret;
2291: }
2292:
1.83 djm 2293: #ifdef WITH_OPENSSL
1.1 djm 2294: static int
1.69 djm 2295: check_rsa_length(const RSA *rsa)
2296: {
2297: const BIGNUM *rsa_n;
2298:
2299: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2300: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2301: return SSH_ERR_KEY_LENGTH;
2302: return 0;
2303: }
1.83 djm 2304: #endif /* WITH_OPENSSL */
1.69 djm 2305:
2306: static int
1.14 djm 2307: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2308: int allow_cert)
1.1 djm 2309: {
1.12 djm 2310: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2311: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2312: struct sshkey *key = NULL;
2313: size_t len;
2314: u_char *pk = NULL;
1.14 djm 2315: struct sshbuf *copy;
1.1 djm 2316: #ifdef WITH_OPENSSL
2317: EC_POINT *q = NULL;
1.69 djm 2318: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2319: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2320: #endif /* WITH_OPENSSL */
2321:
2322: #ifdef DEBUG_PK /* XXX */
1.14 djm 2323: sshbuf_dump(b, stderr);
1.1 djm 2324: #endif
1.32 djm 2325: if (keyp != NULL)
2326: *keyp = NULL;
1.14 djm 2327: if ((copy = sshbuf_fromb(b)) == NULL) {
2328: ret = SSH_ERR_ALLOC_FAIL;
2329: goto out;
2330: }
1.1 djm 2331: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2332: ret = SSH_ERR_INVALID_FORMAT;
2333: goto out;
2334: }
2335:
2336: type = sshkey_type_from_name(ktype);
2337: if (!allow_cert && sshkey_type_is_cert(type)) {
2338: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2339: goto out;
2340: }
2341: switch (type) {
2342: #ifdef WITH_OPENSSL
2343: case KEY_RSA_CERT:
1.14 djm 2344: /* Skip nonce */
1.1 djm 2345: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2346: ret = SSH_ERR_INVALID_FORMAT;
2347: goto out;
2348: }
2349: /* FALLTHROUGH */
2350: case KEY_RSA:
2351: if ((key = sshkey_new(type)) == NULL) {
2352: ret = SSH_ERR_ALLOC_FAIL;
2353: goto out;
2354: }
1.73 djm 2355: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2356: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2357: ret = SSH_ERR_INVALID_FORMAT;
2358: goto out;
2359: }
1.69 djm 2360: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2361: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2362: goto out;
2363: }
1.69 djm 2364: rsa_n = rsa_e = NULL; /* transferred */
2365: if ((ret = check_rsa_length(key->rsa)) != 0)
2366: goto out;
1.1 djm 2367: #ifdef DEBUG_PK
2368: RSA_print_fp(stderr, key->rsa, 8);
2369: #endif
2370: break;
2371: case KEY_DSA_CERT:
1.14 djm 2372: /* Skip nonce */
1.1 djm 2373: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2374: ret = SSH_ERR_INVALID_FORMAT;
2375: goto out;
2376: }
2377: /* FALLTHROUGH */
2378: case KEY_DSA:
2379: if ((key = sshkey_new(type)) == NULL) {
2380: ret = SSH_ERR_ALLOC_FAIL;
2381: goto out;
2382: }
1.73 djm 2383: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2384: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2385: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2386: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2387: ret = SSH_ERR_INVALID_FORMAT;
2388: goto out;
2389: }
1.69 djm 2390: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2391: ret = SSH_ERR_LIBCRYPTO_ERROR;
2392: goto out;
2393: }
2394: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2395: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2396: ret = SSH_ERR_LIBCRYPTO_ERROR;
2397: goto out;
2398: }
2399: dsa_pub_key = NULL; /* transferred */
1.1 djm 2400: #ifdef DEBUG_PK
2401: DSA_print_fp(stderr, key->dsa, 8);
2402: #endif
2403: break;
2404: case KEY_ECDSA_CERT:
1.85 djm 2405: case KEY_ECDSA_SK_CERT:
1.14 djm 2406: /* Skip nonce */
1.1 djm 2407: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2408: ret = SSH_ERR_INVALID_FORMAT;
2409: goto out;
2410: }
2411: /* FALLTHROUGH */
2412: case KEY_ECDSA:
1.85 djm 2413: case KEY_ECDSA_SK:
1.1 djm 2414: if ((key = sshkey_new(type)) == NULL) {
2415: ret = SSH_ERR_ALLOC_FAIL;
2416: goto out;
2417: }
1.12 djm 2418: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2419: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2420: ret = SSH_ERR_INVALID_FORMAT;
2421: goto out;
2422: }
2423: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2424: ret = SSH_ERR_EC_CURVE_MISMATCH;
2425: goto out;
2426: }
1.60 jsing 2427: EC_KEY_free(key->ecdsa);
1.1 djm 2428: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2429: == NULL) {
2430: ret = SSH_ERR_EC_CURVE_INVALID;
2431: goto out;
2432: }
2433: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2434: ret = SSH_ERR_ALLOC_FAIL;
2435: goto out;
2436: }
2437: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2438: ret = SSH_ERR_INVALID_FORMAT;
2439: goto out;
2440: }
2441: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2442: q) != 0) {
2443: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2444: goto out;
2445: }
2446: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2447: /* XXX assume it is a allocation error */
2448: ret = SSH_ERR_ALLOC_FAIL;
2449: goto out;
2450: }
2451: #ifdef DEBUG_PK
2452: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2453: #endif
1.85 djm 2454: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2455: /* Parse additional security-key application string */
2456: if (sshbuf_get_cstring(b, &key->sk_application,
2457: NULL) != 0) {
2458: ret = SSH_ERR_INVALID_FORMAT;
2459: goto out;
2460: }
2461: #ifdef DEBUG_PK
2462: fprintf(stderr, "App: %s\n", key->sk_application);
2463: #endif
2464: }
1.1 djm 2465: break;
2466: #endif /* WITH_OPENSSL */
2467: case KEY_ED25519_CERT:
1.90 markus 2468: case KEY_ED25519_SK_CERT:
1.14 djm 2469: /* Skip nonce */
1.1 djm 2470: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2471: ret = SSH_ERR_INVALID_FORMAT;
2472: goto out;
2473: }
2474: /* FALLTHROUGH */
2475: case KEY_ED25519:
1.90 markus 2476: case KEY_ED25519_SK:
1.1 djm 2477: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2478: goto out;
2479: if (len != ED25519_PK_SZ) {
2480: ret = SSH_ERR_INVALID_FORMAT;
2481: goto out;
2482: }
2483: if ((key = sshkey_new(type)) == NULL) {
2484: ret = SSH_ERR_ALLOC_FAIL;
2485: goto out;
2486: }
1.90 markus 2487: if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) {
2488: /* Parse additional security-key application string */
2489: if (sshbuf_get_cstring(b, &key->sk_application,
2490: NULL) != 0) {
2491: ret = SSH_ERR_INVALID_FORMAT;
2492: goto out;
2493: }
2494: #ifdef DEBUG_PK
2495: fprintf(stderr, "App: %s\n", key->sk_application);
2496: #endif
2497: }
1.1 djm 2498: key->ed25519_pk = pk;
2499: pk = NULL;
2500: break;
1.62 markus 2501: #ifdef WITH_XMSS
2502: case KEY_XMSS_CERT:
2503: /* Skip nonce */
2504: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2505: ret = SSH_ERR_INVALID_FORMAT;
2506: goto out;
2507: }
2508: /* FALLTHROUGH */
2509: case KEY_XMSS:
2510: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2511: goto out;
2512: if ((key = sshkey_new(type)) == NULL) {
2513: ret = SSH_ERR_ALLOC_FAIL;
2514: goto out;
2515: }
2516: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2517: goto out;
2518: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2519: goto out;
2520: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2521: ret = SSH_ERR_INVALID_FORMAT;
2522: goto out;
2523: }
2524: key->xmss_pk = pk;
2525: pk = NULL;
2526: if (type != KEY_XMSS_CERT &&
2527: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2528: goto out;
2529: break;
2530: #endif /* WITH_XMSS */
1.1 djm 2531: case KEY_UNSPEC:
2532: default:
2533: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2534: goto out;
2535: }
2536:
2537: /* Parse certificate potion */
1.14 djm 2538: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2539: goto out;
2540:
2541: if (key != NULL && sshbuf_len(b) != 0) {
2542: ret = SSH_ERR_INVALID_FORMAT;
2543: goto out;
2544: }
2545: ret = 0;
1.32 djm 2546: if (keyp != NULL) {
2547: *keyp = key;
2548: key = NULL;
2549: }
1.1 djm 2550: out:
1.14 djm 2551: sshbuf_free(copy);
1.1 djm 2552: sshkey_free(key);
1.62 markus 2553: free(xmss_name);
1.1 djm 2554: free(ktype);
2555: free(curve);
2556: free(pk);
2557: #ifdef WITH_OPENSSL
1.60 jsing 2558: EC_POINT_free(q);
1.69 djm 2559: BN_clear_free(rsa_n);
2560: BN_clear_free(rsa_e);
2561: BN_clear_free(dsa_p);
2562: BN_clear_free(dsa_q);
2563: BN_clear_free(dsa_g);
2564: BN_clear_free(dsa_pub_key);
1.1 djm 2565: #endif /* WITH_OPENSSL */
2566: return ret;
2567: }
2568:
2569: int
2570: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2571: {
1.14 djm 2572: struct sshbuf *b;
2573: int r;
2574:
2575: if ((b = sshbuf_from(blob, blen)) == NULL)
2576: return SSH_ERR_ALLOC_FAIL;
2577: r = sshkey_from_blob_internal(b, keyp, 1);
2578: sshbuf_free(b);
2579: return r;
2580: }
2581:
2582: int
2583: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2584: {
2585: return sshkey_from_blob_internal(b, keyp, 1);
2586: }
2587:
2588: int
2589: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2590: {
2591: struct sshbuf *b;
2592: int r;
2593:
2594: if ((r = sshbuf_froms(buf, &b)) != 0)
2595: return r;
2596: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2597: sshbuf_free(b);
2598: return r;
2599: }
2600:
1.82 djm 2601: int
2602: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2603: {
2604: int r;
2605: struct sshbuf *b = NULL;
2606: char *sigtype = NULL;
2607:
2608: if (sigtypep != NULL)
2609: *sigtypep = NULL;
2610: if ((b = sshbuf_from(sig, siglen)) == NULL)
2611: return SSH_ERR_ALLOC_FAIL;
2612: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2613: goto out;
2614: /* success */
2615: if (sigtypep != NULL) {
2616: *sigtypep = sigtype;
2617: sigtype = NULL;
2618: }
2619: r = 0;
2620: out:
2621: free(sigtype);
1.14 djm 2622: sshbuf_free(b);
2623: return r;
1.68 djm 2624: }
2625:
2626: /*
2627: *
2628: * Checks whether a certificate's signature type is allowed.
2629: * Returns 0 (success) if the certificate signature type appears in the
2630: * "allowed" pattern-list, or the key is not a certificate to begin with.
2631: * Otherwise returns a ssherr.h code.
2632: */
2633: int
2634: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2635: {
2636: if (key == NULL || allowed == NULL)
2637: return SSH_ERR_INVALID_ARGUMENT;
2638: if (!sshkey_type_is_cert(key->type))
2639: return 0;
2640: if (key->cert == NULL || key->cert->signature_type == NULL)
2641: return SSH_ERR_INVALID_ARGUMENT;
2642: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2643: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2644: return 0;
1.65 djm 2645: }
2646:
2647: /*
2648: * Returns the expected signature algorithm for a given public key algorithm.
2649: */
1.66 djm 2650: const char *
2651: sshkey_sigalg_by_name(const char *name)
1.65 djm 2652: {
2653: const struct keytype *kt;
2654:
2655: for (kt = keytypes; kt->type != -1; kt++) {
2656: if (strcmp(kt->name, name) != 0)
2657: continue;
2658: if (kt->sigalg != NULL)
2659: return kt->sigalg;
2660: if (!kt->cert)
2661: return kt->name;
2662: return sshkey_ssh_name_from_type_nid(
2663: sshkey_type_plain(kt->type), kt->nid);
2664: }
2665: return NULL;
2666: }
2667:
2668: /*
2669: * Verifies that the signature algorithm appearing inside the signature blob
2670: * matches that which was requested.
2671: */
2672: int
2673: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2674: const char *requested_alg)
2675: {
2676: const char *expected_alg;
2677: char *sigtype = NULL;
2678: int r;
2679:
2680: if (requested_alg == NULL)
2681: return 0;
1.66 djm 2682: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2683: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2684: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2685: return r;
2686: r = strcmp(expected_alg, sigtype) == 0;
2687: free(sigtype);
2688: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2689: }
2690:
2691: int
1.76 djm 2692: sshkey_sign(struct sshkey *key,
1.1 djm 2693: u_char **sigp, size_t *lenp,
1.86 djm 2694: const u_char *data, size_t datalen,
2695: const char *alg, const char *sk_provider, u_int compat)
1.1 djm 2696: {
1.76 djm 2697: int was_shielded = sshkey_is_shielded(key);
2698: int r2, r = SSH_ERR_INTERNAL_ERROR;
2699:
1.1 djm 2700: if (sigp != NULL)
2701: *sigp = NULL;
2702: if (lenp != NULL)
2703: *lenp = 0;
2704: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2705: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2706: if ((r = sshkey_unshield_private(key)) != 0)
2707: return r;
1.1 djm 2708: switch (key->type) {
2709: #ifdef WITH_OPENSSL
2710: case KEY_DSA_CERT:
2711: case KEY_DSA:
1.76 djm 2712: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2713: break;
1.1 djm 2714: case KEY_ECDSA_CERT:
2715: case KEY_ECDSA:
1.76 djm 2716: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2717: break;
1.86 djm 2718: case KEY_ECDSA_SK_CERT:
2719: case KEY_ECDSA_SK:
1.88 markus 2720: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2721: compat);
1.86 djm 2722: break;
1.1 djm 2723: case KEY_RSA_CERT:
2724: case KEY_RSA:
1.76 djm 2725: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2726: break;
1.1 djm 2727: #endif /* WITH_OPENSSL */
2728: case KEY_ED25519:
2729: case KEY_ED25519_CERT:
1.76 djm 2730: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 markus 2731: break;
2732: case KEY_ED25519_SK:
2733: case KEY_ED25519_SK_CERT:
2734: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2735: compat);
1.76 djm 2736: break;
1.62 markus 2737: #ifdef WITH_XMSS
2738: case KEY_XMSS:
2739: case KEY_XMSS_CERT:
1.76 djm 2740: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2741: break;
1.62 markus 2742: #endif /* WITH_XMSS */
1.1 djm 2743: default:
1.76 djm 2744: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2745: break;
1.1 djm 2746: }
1.76 djm 2747: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2748: return r2;
2749: return r;
1.1 djm 2750: }
2751:
2752: /*
2753: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2754: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2755: */
2756: int
2757: sshkey_verify(const struct sshkey *key,
2758: const u_char *sig, size_t siglen,
1.59 djm 2759: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2760: {
1.6 djm 2761: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2762: return SSH_ERR_INVALID_ARGUMENT;
2763: switch (key->type) {
2764: #ifdef WITH_OPENSSL
2765: case KEY_DSA_CERT:
2766: case KEY_DSA:
2767: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2768: case KEY_ECDSA_CERT:
2769: case KEY_ECDSA:
2770: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2771: case KEY_ECDSA_SK_CERT:
2772: case KEY_ECDSA_SK:
2773: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
2774: compat);
1.1 djm 2775: case KEY_RSA_CERT:
2776: case KEY_RSA:
1.59 djm 2777: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2778: #endif /* WITH_OPENSSL */
2779: case KEY_ED25519:
2780: case KEY_ED25519_CERT:
2781: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2782: case KEY_ED25519_SK:
2783: case KEY_ED25519_SK_CERT:
2784: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
2785: compat);
1.62 markus 2786: #ifdef WITH_XMSS
2787: case KEY_XMSS:
2788: case KEY_XMSS_CERT:
2789: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2790: #endif /* WITH_XMSS */
1.1 djm 2791: default:
2792: return SSH_ERR_KEY_TYPE_UNKNOWN;
2793: }
2794: }
2795:
2796: /* Convert a plain key to their _CERT equivalent */
2797: int
1.20 djm 2798: sshkey_to_certified(struct sshkey *k)
1.1 djm 2799: {
2800: int newtype;
2801:
2802: switch (k->type) {
2803: #ifdef WITH_OPENSSL
2804: case KEY_RSA:
1.20 djm 2805: newtype = KEY_RSA_CERT;
1.1 djm 2806: break;
2807: case KEY_DSA:
1.20 djm 2808: newtype = KEY_DSA_CERT;
1.1 djm 2809: break;
2810: case KEY_ECDSA:
2811: newtype = KEY_ECDSA_CERT;
2812: break;
1.85 djm 2813: case KEY_ECDSA_SK:
2814: newtype = KEY_ECDSA_SK_CERT;
2815: break;
1.1 djm 2816: #endif /* WITH_OPENSSL */
1.90 markus 2817: case KEY_ED25519_SK:
2818: newtype = KEY_ED25519_SK_CERT;
2819: break;
1.1 djm 2820: case KEY_ED25519:
2821: newtype = KEY_ED25519_CERT;
2822: break;
1.62 markus 2823: #ifdef WITH_XMSS
2824: case KEY_XMSS:
2825: newtype = KEY_XMSS_CERT;
2826: break;
2827: #endif /* WITH_XMSS */
1.1 djm 2828: default:
2829: return SSH_ERR_INVALID_ARGUMENT;
2830: }
2831: if ((k->cert = cert_new()) == NULL)
2832: return SSH_ERR_ALLOC_FAIL;
2833: k->type = newtype;
2834: return 0;
2835: }
2836:
2837: /* Convert a certificate to its raw key equivalent */
2838: int
2839: sshkey_drop_cert(struct sshkey *k)
2840: {
2841: if (!sshkey_type_is_cert(k->type))
2842: return SSH_ERR_KEY_TYPE_UNKNOWN;
2843: cert_free(k->cert);
2844: k->cert = NULL;
2845: k->type = sshkey_type_plain(k->type);
2846: return 0;
2847: }
2848:
2849: /* Sign a certified key, (re-)generating the signed certblob. */
2850: int
1.53 djm 2851: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.86 djm 2852: const char *sk_provider, sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2853: {
2854: struct sshbuf *principals = NULL;
2855: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2856: size_t i, ca_len, sig_len;
2857: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2858: struct sshbuf *cert = NULL;
2859: char *sigtype = NULL;
1.69 djm 2860: #ifdef WITH_OPENSSL
2861: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2862: #endif /* WITH_OPENSSL */
1.1 djm 2863:
2864: if (k == NULL || k->cert == NULL ||
2865: k->cert->certblob == NULL || ca == NULL)
2866: return SSH_ERR_INVALID_ARGUMENT;
2867: if (!sshkey_is_cert(k))
2868: return SSH_ERR_KEY_TYPE_UNKNOWN;
2869: if (!sshkey_type_is_valid_ca(ca->type))
2870: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2871:
1.67 djm 2872: /*
2873: * If no alg specified as argument but a signature_type was set,
2874: * then prefer that. If both were specified, then they must match.
2875: */
2876: if (alg == NULL)
2877: alg = k->cert->signature_type;
2878: else if (k->cert->signature_type != NULL &&
2879: strcmp(alg, k->cert->signature_type) != 0)
2880: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2881:
2882: /*
2883: * If no signing algorithm or signature_type was specified and we're
2884: * using a RSA key, then default to a good signature algorithm.
2885: */
2886: if (alg == NULL && ca->type == KEY_RSA)
2887: alg = "rsa-sha2-512";
1.67 djm 2888:
1.1 djm 2889: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2890: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2891:
2892: cert = k->cert->certblob; /* for readability */
2893: sshbuf_reset(cert);
2894: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2895: goto out;
2896:
2897: /* -v01 certs put nonce first */
2898: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2899: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2900: goto out;
1.1 djm 2901:
2902: /* XXX this substantially duplicates to_blob(); refactor */
2903: switch (k->type) {
2904: #ifdef WITH_OPENSSL
2905: case KEY_DSA_CERT:
1.69 djm 2906: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2907: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2908: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2909: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2910: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2911: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2912: goto out;
2913: break;
2914: case KEY_ECDSA_CERT:
1.85 djm 2915: case KEY_ECDSA_SK_CERT:
1.1 djm 2916: if ((ret = sshbuf_put_cstring(cert,
2917: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2918: (ret = sshbuf_put_ec(cert,
2919: EC_KEY_get0_public_key(k->ecdsa),
2920: EC_KEY_get0_group(k->ecdsa))) != 0)
2921: goto out;
1.85 djm 2922: if (k->type == KEY_ECDSA_SK_CERT) {
2923: if ((ret = sshbuf_put_cstring(cert,
2924: k->sk_application)) != 0)
2925: goto out;
2926: }
1.1 djm 2927: break;
2928: case KEY_RSA_CERT:
1.69 djm 2929: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2930: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2931: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2932: goto out;
2933: break;
2934: #endif /* WITH_OPENSSL */
2935: case KEY_ED25519_CERT:
2936: if ((ret = sshbuf_put_string(cert,
2937: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2938: goto out;
2939: break;
1.62 markus 2940: #ifdef WITH_XMSS
2941: case KEY_XMSS_CERT:
2942: if (k->xmss_name == NULL) {
2943: ret = SSH_ERR_INVALID_ARGUMENT;
2944: goto out;
2945: }
2946: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2947: (ret = sshbuf_put_string(cert,
2948: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2949: goto out;
2950: break;
2951: #endif /* WITH_XMSS */
1.1 djm 2952: default:
2953: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2954: goto out;
1.1 djm 2955: }
2956:
1.20 djm 2957: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2958: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2959: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2960: goto out;
2961:
2962: if ((principals = sshbuf_new()) == NULL) {
2963: ret = SSH_ERR_ALLOC_FAIL;
2964: goto out;
2965: }
2966: for (i = 0; i < k->cert->nprincipals; i++) {
2967: if ((ret = sshbuf_put_cstring(principals,
2968: k->cert->principals[i])) != 0)
2969: goto out;
2970: }
2971: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2972: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2973: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2974: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2975: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2976: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2977: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2978: goto out;
2979:
2980: /* Sign the whole mess */
1.53 djm 2981: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.86 djm 2982: sshbuf_len(cert), alg, sk_provider, 0, signer_ctx)) != 0)
1.1 djm 2983: goto out;
1.67 djm 2984: /* Check and update signature_type against what was actually used */
1.82 djm 2985: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2986: goto out;
2987: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2988: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2989: goto out;
2990: }
2991: if (k->cert->signature_type == NULL) {
2992: k->cert->signature_type = sigtype;
2993: sigtype = NULL;
2994: }
1.1 djm 2995: /* Append signature and we are done */
2996: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2997: goto out;
2998: ret = 0;
2999: out:
3000: if (ret != 0)
3001: sshbuf_reset(cert);
1.29 mmcc 3002: free(sig_blob);
3003: free(ca_blob);
1.67 djm 3004: free(sigtype);
1.31 mmcc 3005: sshbuf_free(principals);
1.1 djm 3006: return ret;
1.53 djm 3007: }
3008:
3009: static int
1.76 djm 3010: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 3011: const u_char *data, size_t datalen,
1.86 djm 3012: const char *alg, const char *sk_provider, u_int compat, void *ctx)
1.53 djm 3013: {
3014: if (ctx != NULL)
3015: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 3016: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
3017: sk_provider, compat);
1.53 djm 3018: }
3019:
3020: int
1.86 djm 3021: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
3022: const char *sk_provider)
1.53 djm 3023: {
1.86 djm 3024: return sshkey_certify_custom(k, ca, alg, sk_provider,
3025: default_key_sign, NULL);
1.1 djm 3026: }
3027:
3028: int
3029: sshkey_cert_check_authority(const struct sshkey *k,
3030: int want_host, int require_principal,
3031: const char *name, const char **reason)
3032: {
3033: u_int i, principal_matches;
3034: time_t now = time(NULL);
3035:
3036: if (reason != NULL)
3037: *reason = NULL;
3038:
3039: if (want_host) {
3040: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
3041: *reason = "Certificate invalid: not a host certificate";
3042: return SSH_ERR_KEY_CERT_INVALID;
3043: }
3044: } else {
3045: if (k->cert->type != SSH2_CERT_TYPE_USER) {
3046: *reason = "Certificate invalid: not a user certificate";
3047: return SSH_ERR_KEY_CERT_INVALID;
3048: }
3049: }
3050: if (now < 0) {
3051: /* yikes - system clock before epoch! */
3052: *reason = "Certificate invalid: not yet valid";
3053: return SSH_ERR_KEY_CERT_INVALID;
3054: }
3055: if ((u_int64_t)now < k->cert->valid_after) {
3056: *reason = "Certificate invalid: not yet valid";
3057: return SSH_ERR_KEY_CERT_INVALID;
3058: }
3059: if ((u_int64_t)now >= k->cert->valid_before) {
3060: *reason = "Certificate invalid: expired";
3061: return SSH_ERR_KEY_CERT_INVALID;
3062: }
3063: if (k->cert->nprincipals == 0) {
3064: if (require_principal) {
3065: *reason = "Certificate lacks principal list";
3066: return SSH_ERR_KEY_CERT_INVALID;
3067: }
3068: } else if (name != NULL) {
3069: principal_matches = 0;
3070: for (i = 0; i < k->cert->nprincipals; i++) {
3071: if (strcmp(name, k->cert->principals[i]) == 0) {
3072: principal_matches = 1;
3073: break;
3074: }
3075: }
3076: if (!principal_matches) {
3077: *reason = "Certificate invalid: name is not a listed "
3078: "principal";
3079: return SSH_ERR_KEY_CERT_INVALID;
3080: }
3081: }
3082: return 0;
1.27 djm 3083: }
3084:
3085: size_t
3086: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
3087: {
3088: char from[32], to[32], ret[64];
3089: time_t tt;
3090: struct tm *tm;
3091:
3092: *from = *to = '\0';
3093: if (cert->valid_after == 0 &&
3094: cert->valid_before == 0xffffffffffffffffULL)
3095: return strlcpy(s, "forever", l);
3096:
3097: if (cert->valid_after != 0) {
3098: /* XXX revisit INT_MAX in 2038 :) */
3099: tt = cert->valid_after > INT_MAX ?
3100: INT_MAX : cert->valid_after;
3101: tm = localtime(&tt);
3102: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
3103: }
3104: if (cert->valid_before != 0xffffffffffffffffULL) {
3105: /* XXX revisit INT_MAX in 2038 :) */
3106: tt = cert->valid_before > INT_MAX ?
3107: INT_MAX : cert->valid_before;
3108: tm = localtime(&tt);
3109: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
3110: }
3111:
3112: if (cert->valid_after == 0)
3113: snprintf(ret, sizeof(ret), "before %s", to);
3114: else if (cert->valid_before == 0xffffffffffffffffULL)
3115: snprintf(ret, sizeof(ret), "after %s", from);
3116: else
3117: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
3118:
3119: return strlcpy(s, ret, l);
1.1 djm 3120: }
3121:
3122: int
1.76 djm 3123: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 3124: enum sshkey_serialize_rep opts)
1.1 djm 3125: {
3126: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 3127: int was_shielded = sshkey_is_shielded(key);
3128: struct sshbuf *b = NULL;
1.69 djm 3129: #ifdef WITH_OPENSSL
3130: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
3131: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
3132: #endif /* WITH_OPENSSL */
1.1 djm 3133:
1.76 djm 3134: if ((r = sshkey_unshield_private(key)) != 0)
3135: return r;
3136: if ((b = sshbuf_new()) == NULL)
3137: return SSH_ERR_ALLOC_FAIL;
1.1 djm 3138: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
3139: goto out;
3140: switch (key->type) {
3141: #ifdef WITH_OPENSSL
3142: case KEY_RSA:
1.69 djm 3143: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
3144: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3145: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
3146: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
3147: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
3148: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3149: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3150: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3151: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3152: goto out;
3153: break;
3154: case KEY_RSA_CERT:
3155: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3156: r = SSH_ERR_INVALID_ARGUMENT;
3157: goto out;
3158: }
1.69 djm 3159: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
3160: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3161: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 3162: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3163: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3164: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3165: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3166: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3167: goto out;
3168: break;
3169: case KEY_DSA:
1.69 djm 3170: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
3171: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
3172: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
3173: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
3174: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
3175: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3176: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3177: goto out;
3178: break;
3179: case KEY_DSA_CERT:
3180: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3181: r = SSH_ERR_INVALID_ARGUMENT;
3182: goto out;
3183: }
1.69 djm 3184: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3185: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3186: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3187: goto out;
3188: break;
3189: case KEY_ECDSA:
3190: if ((r = sshbuf_put_cstring(b,
3191: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3192: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3193: (r = sshbuf_put_bignum2(b,
3194: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3195: goto out;
3196: break;
3197: case KEY_ECDSA_CERT:
3198: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3199: r = SSH_ERR_INVALID_ARGUMENT;
3200: goto out;
3201: }
3202: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3203: (r = sshbuf_put_bignum2(b,
3204: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3205: goto out;
3206: break;
1.85 djm 3207: case KEY_ECDSA_SK:
3208: if ((r = sshbuf_put_cstring(b,
3209: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3210: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3211: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3212: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3213: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3214: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3215: goto out;
3216: break;
3217: case KEY_ECDSA_SK_CERT:
3218: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3219: r = SSH_ERR_INVALID_ARGUMENT;
3220: goto out;
3221: }
3222: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3223: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3224: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3225: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3226: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3227: goto out;
3228: break;
1.1 djm 3229: #endif /* WITH_OPENSSL */
3230: case KEY_ED25519:
3231: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3232: ED25519_PK_SZ)) != 0 ||
3233: (r = sshbuf_put_string(b, key->ed25519_sk,
3234: ED25519_SK_SZ)) != 0)
3235: goto out;
3236: break;
3237: case KEY_ED25519_CERT:
3238: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3239: r = SSH_ERR_INVALID_ARGUMENT;
3240: goto out;
3241: }
3242: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3243: (r = sshbuf_put_string(b, key->ed25519_pk,
3244: ED25519_PK_SZ)) != 0 ||
3245: (r = sshbuf_put_string(b, key->ed25519_sk,
3246: ED25519_SK_SZ)) != 0)
3247: goto out;
3248: break;
1.90 markus 3249: case KEY_ED25519_SK:
3250: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3251: ED25519_PK_SZ)) != 0 ||
3252: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3253: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3254: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3255: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3256: goto out;
3257: break;
3258: case KEY_ED25519_SK_CERT:
3259: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3260: r = SSH_ERR_INVALID_ARGUMENT;
3261: goto out;
3262: }
3263: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3264: (r = sshbuf_put_string(b, key->ed25519_pk,
3265: ED25519_PK_SZ)) != 0 ||
3266: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3267: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3268: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3269: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3270: goto out;
3271: break;
1.62 markus 3272: #ifdef WITH_XMSS
3273: case KEY_XMSS:
3274: if (key->xmss_name == NULL) {
3275: r = SSH_ERR_INVALID_ARGUMENT;
3276: goto out;
3277: }
3278: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3279: (r = sshbuf_put_string(b, key->xmss_pk,
3280: sshkey_xmss_pklen(key))) != 0 ||
3281: (r = sshbuf_put_string(b, key->xmss_sk,
3282: sshkey_xmss_sklen(key))) != 0 ||
3283: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3284: goto out;
3285: break;
3286: case KEY_XMSS_CERT:
3287: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3288: key->xmss_name == NULL) {
3289: r = SSH_ERR_INVALID_ARGUMENT;
3290: goto out;
3291: }
3292: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3293: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3294: (r = sshbuf_put_string(b, key->xmss_pk,
3295: sshkey_xmss_pklen(key))) != 0 ||
3296: (r = sshbuf_put_string(b, key->xmss_sk,
3297: sshkey_xmss_sklen(key))) != 0 ||
3298: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3299: goto out;
3300: break;
3301: #endif /* WITH_XMSS */
1.1 djm 3302: default:
3303: r = SSH_ERR_INVALID_ARGUMENT;
3304: goto out;
3305: }
1.76 djm 3306: /*
3307: * success (but we still need to append the output to buf after
3308: * possibly re-shielding the private key)
3309: */
1.1 djm 3310: r = 0;
3311: out:
1.76 djm 3312: if (was_shielded)
3313: r = sshkey_shield_private(key);
3314: if (r == 0)
3315: r = sshbuf_putb(buf, b);
3316: sshbuf_free(b);
3317:
1.1 djm 3318: return r;
3319: }
3320:
3321: int
1.76 djm 3322: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3323: {
3324: return sshkey_private_serialize_opt(key, b,
3325: SSHKEY_SERIALIZE_DEFAULT);
3326: }
3327:
3328: int
1.1 djm 3329: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3330: {
1.62 markus 3331: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3332: struct sshkey *k = NULL;
1.14 djm 3333: size_t pklen = 0, sklen = 0;
1.1 djm 3334: int type, r = SSH_ERR_INTERNAL_ERROR;
3335: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3336: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3337: #ifdef WITH_OPENSSL
3338: BIGNUM *exponent = NULL;
1.69 djm 3339: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3340: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3341: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3342: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3343: #endif /* WITH_OPENSSL */
3344:
3345: if (kp != NULL)
3346: *kp = NULL;
3347: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3348: goto out;
3349: type = sshkey_type_from_name(tname);
3350: switch (type) {
3351: #ifdef WITH_OPENSSL
3352: case KEY_DSA:
1.70 djm 3353: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3354: r = SSH_ERR_ALLOC_FAIL;
3355: goto out;
3356: }
1.73 djm 3357: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3358: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3359: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3360: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3361: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3362: goto out;
3363: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3364: r = SSH_ERR_LIBCRYPTO_ERROR;
3365: goto out;
3366: }
3367: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3368: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3369: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3370: goto out;
1.69 djm 3371: }
3372: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3373: break;
3374: case KEY_DSA_CERT:
1.14 djm 3375: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3376: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3377: goto out;
1.84 djm 3378: if (k->type != type) {
3379: r = SSH_ERR_INVALID_FORMAT;
3380: goto out;
3381: }
1.69 djm 3382: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3383: r = SSH_ERR_LIBCRYPTO_ERROR;
3384: goto out;
3385: }
3386: dsa_priv_key = NULL; /* transferred */
1.1 djm 3387: break;
3388: case KEY_ECDSA:
1.70 djm 3389: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3390: r = SSH_ERR_ALLOC_FAIL;
3391: goto out;
3392: }
3393: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3394: r = SSH_ERR_INVALID_ARGUMENT;
3395: goto out;
3396: }
3397: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3398: goto out;
3399: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3400: r = SSH_ERR_EC_CURVE_MISMATCH;
3401: goto out;
3402: }
3403: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3404: if (k->ecdsa == NULL) {
1.1 djm 3405: r = SSH_ERR_LIBCRYPTO_ERROR;
3406: goto out;
3407: }
3408: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3409: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3410: goto out;
3411: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3412: r = SSH_ERR_LIBCRYPTO_ERROR;
3413: goto out;
3414: }
3415: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3416: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3417: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3418: goto out;
3419: break;
3420: case KEY_ECDSA_CERT:
1.14 djm 3421: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3422: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3423: goto out;
1.84 djm 3424: if (k->type != type ||
3425: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
3426: r = SSH_ERR_INVALID_FORMAT;
3427: goto out;
3428: }
1.1 djm 3429: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3430: r = SSH_ERR_LIBCRYPTO_ERROR;
3431: goto out;
3432: }
3433: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3434: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3435: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3436: goto out;
3437: break;
1.85 djm 3438: case KEY_ECDSA_SK:
3439: if ((k = sshkey_new(type)) == NULL) {
3440: r = SSH_ERR_ALLOC_FAIL;
3441: goto out;
3442: }
3443: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3444: r = SSH_ERR_INVALID_ARGUMENT;
3445: goto out;
3446: }
3447: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3448: goto out;
3449: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3450: r = SSH_ERR_EC_CURVE_MISMATCH;
3451: goto out;
3452: }
3453: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3454: (k->sk_reserved = sshbuf_new()) == NULL) {
3455: r = SSH_ERR_ALLOC_FAIL;
3456: goto out;
3457: }
3458: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3459: if (k->ecdsa == NULL) {
3460: r = SSH_ERR_LIBCRYPTO_ERROR;
3461: goto out;
3462: }
3463: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3464: (r = sshbuf_get_cstring(buf, &k->sk_application,
3465: NULL)) != 0 ||
3466: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3467: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3468: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3469: goto out;
3470: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3471: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3472: goto out;
3473: break;
3474: case KEY_ECDSA_SK_CERT:
3475: if ((r = sshkey_froms(buf, &k)) != 0)
3476: goto out;
3477: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3478: (k->sk_reserved = sshbuf_new()) == NULL) {
3479: r = SSH_ERR_ALLOC_FAIL;
3480: goto out;
3481: }
3482: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3483: NULL)) != 0 ||
3484: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3485: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3486: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3487: goto out;
3488: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3489: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3490: goto out;
3491: break;
1.1 djm 3492: case KEY_RSA:
1.70 djm 3493: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3494: r = SSH_ERR_ALLOC_FAIL;
3495: goto out;
3496: }
1.73 djm 3497: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3498: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3499: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3500: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3501: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3502: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3503: goto out;
1.69 djm 3504: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3505: r = SSH_ERR_LIBCRYPTO_ERROR;
3506: goto out;
3507: }
3508: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3509: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3510: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3511: goto out;
3512: }
1.69 djm 3513: rsa_p = rsa_q = NULL; /* transferred */
3514: if ((r = check_rsa_length(k->rsa)) != 0)
3515: goto out;
3516: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3517: goto out;
1.1 djm 3518: break;
3519: case KEY_RSA_CERT:
1.14 djm 3520: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3521: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3522: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3523: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3524: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3525: goto out;
1.84 djm 3526: if (k->type != type) {
3527: r = SSH_ERR_INVALID_FORMAT;
3528: goto out;
3529: }
1.69 djm 3530: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3531: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3532: goto out;
3533: }
1.69 djm 3534: rsa_d = NULL; /* transferred */
3535: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3536: r = SSH_ERR_LIBCRYPTO_ERROR;
3537: goto out;
3538: }
3539: rsa_p = rsa_q = NULL; /* transferred */
3540: if ((r = check_rsa_length(k->rsa)) != 0)
3541: goto out;
3542: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3543: goto out;
1.1 djm 3544: break;
3545: #endif /* WITH_OPENSSL */
3546: case KEY_ED25519:
1.70 djm 3547: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3548: r = SSH_ERR_ALLOC_FAIL;
3549: goto out;
3550: }
3551: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3552: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3553: goto out;
3554: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3555: r = SSH_ERR_INVALID_FORMAT;
3556: goto out;
3557: }
3558: k->ed25519_pk = ed25519_pk;
3559: k->ed25519_sk = ed25519_sk;
3560: ed25519_pk = ed25519_sk = NULL;
3561: break;
3562: case KEY_ED25519_CERT:
1.14 djm 3563: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3564: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3565: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3566: goto out;
1.84 djm 3567: if (k->type != type) {
3568: r = SSH_ERR_INVALID_FORMAT;
3569: goto out;
3570: }
1.1 djm 3571: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3572: r = SSH_ERR_INVALID_FORMAT;
3573: goto out;
3574: }
3575: k->ed25519_pk = ed25519_pk;
3576: k->ed25519_sk = ed25519_sk;
1.84 djm 3577: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3578: break;
1.90 markus 3579: case KEY_ED25519_SK:
3580: if ((k = sshkey_new(type)) == NULL) {
3581: r = SSH_ERR_ALLOC_FAIL;
3582: goto out;
3583: }
3584: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3585: goto out;
3586: if (pklen != ED25519_PK_SZ) {
3587: r = SSH_ERR_INVALID_FORMAT;
3588: goto out;
3589: }
3590: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3591: (k->sk_reserved = sshbuf_new()) == NULL) {
3592: r = SSH_ERR_ALLOC_FAIL;
3593: goto out;
3594: }
3595: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3596: NULL)) != 0 ||
3597: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3598: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3599: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3600: goto out;
3601: k->ed25519_pk = ed25519_pk;
3602: ed25519_pk = NULL;
3603: break;
3604: case KEY_ED25519_SK_CERT:
3605: if ((r = sshkey_froms(buf, &k)) != 0 ||
3606: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0)
3607: goto out;
3608: if (k->type != type) {
3609: r = SSH_ERR_INVALID_FORMAT;
3610: goto out;
3611: }
3612: if (pklen != ED25519_PK_SZ) {
3613: r = SSH_ERR_INVALID_FORMAT;
3614: goto out;
3615: }
3616: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3617: (k->sk_reserved = sshbuf_new()) == NULL) {
3618: r = SSH_ERR_ALLOC_FAIL;
3619: goto out;
3620: }
3621: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3622: NULL)) != 0 ||
3623: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3624: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3625: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3626: goto out;
3627: k->ed25519_pk = ed25519_pk;
3628: ed25519_pk = NULL; /* transferred */
3629: break;
1.62 markus 3630: #ifdef WITH_XMSS
3631: case KEY_XMSS:
1.70 djm 3632: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3633: r = SSH_ERR_ALLOC_FAIL;
3634: goto out;
3635: }
3636: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3637: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3638: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3639: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3640: goto out;
3641: if (pklen != sshkey_xmss_pklen(k) ||
3642: sklen != sshkey_xmss_sklen(k)) {
3643: r = SSH_ERR_INVALID_FORMAT;
3644: goto out;
3645: }
3646: k->xmss_pk = xmss_pk;
3647: k->xmss_sk = xmss_sk;
3648: xmss_pk = xmss_sk = NULL;
3649: /* optional internal state */
3650: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3651: goto out;
3652: break;
3653: case KEY_XMSS_CERT:
3654: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3655: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3656: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3657: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3658: goto out;
1.84 djm 3659: if (k->type != type || strcmp(xmss_name, k->xmss_name) != 0) {
1.64 markus 3660: r = SSH_ERR_INVALID_FORMAT;
3661: goto out;
3662: }
1.62 markus 3663: if (pklen != sshkey_xmss_pklen(k) ||
3664: sklen != sshkey_xmss_sklen(k)) {
3665: r = SSH_ERR_INVALID_FORMAT;
3666: goto out;
3667: }
3668: k->xmss_pk = xmss_pk;
3669: k->xmss_sk = xmss_sk;
3670: xmss_pk = xmss_sk = NULL;
3671: /* optional internal state */
3672: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3673: goto out;
3674: break;
3675: #endif /* WITH_XMSS */
1.1 djm 3676: default:
3677: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3678: goto out;
3679: }
3680: #ifdef WITH_OPENSSL
3681: /* enable blinding */
3682: switch (k->type) {
3683: case KEY_RSA:
3684: case KEY_RSA_CERT:
3685: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3686: r = SSH_ERR_LIBCRYPTO_ERROR;
3687: goto out;
3688: }
3689: break;
3690: }
3691: #endif /* WITH_OPENSSL */
3692: /* success */
3693: r = 0;
3694: if (kp != NULL) {
3695: *kp = k;
3696: k = NULL;
3697: }
3698: out:
3699: free(tname);
3700: free(curve);
3701: #ifdef WITH_OPENSSL
1.60 jsing 3702: BN_clear_free(exponent);
1.69 djm 3703: BN_clear_free(dsa_p);
3704: BN_clear_free(dsa_q);
3705: BN_clear_free(dsa_g);
3706: BN_clear_free(dsa_pub_key);
3707: BN_clear_free(dsa_priv_key);
3708: BN_clear_free(rsa_n);
3709: BN_clear_free(rsa_e);
3710: BN_clear_free(rsa_d);
3711: BN_clear_free(rsa_p);
3712: BN_clear_free(rsa_q);
3713: BN_clear_free(rsa_iqmp);
1.1 djm 3714: #endif /* WITH_OPENSSL */
3715: sshkey_free(k);
1.61 jsing 3716: freezero(ed25519_pk, pklen);
3717: freezero(ed25519_sk, sklen);
1.62 markus 3718: free(xmss_name);
3719: freezero(xmss_pk, pklen);
3720: freezero(xmss_sk, sklen);
1.1 djm 3721: return r;
3722: }
3723:
3724: #ifdef WITH_OPENSSL
3725: int
3726: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3727: {
3728: BN_CTX *bnctx;
3729: EC_POINT *nq = NULL;
3730: BIGNUM *order, *x, *y, *tmp;
3731: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3732:
3733: /*
3734: * NB. This assumes OpenSSL has already verified that the public
3735: * point lies on the curve. This is done by EC_POINT_oct2point()
3736: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3737: * reachable with public points not unmarshalled using
3738: * EC_POINT_oct2point then the caller will need to explicitly check.
3739: */
1.1 djm 3740:
3741: if ((bnctx = BN_CTX_new()) == NULL)
3742: return SSH_ERR_ALLOC_FAIL;
3743: BN_CTX_start(bnctx);
3744:
3745: /*
3746: * We shouldn't ever hit this case because bignum_get_ecpoint()
3747: * refuses to load GF2m points.
3748: */
3749: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3750: NID_X9_62_prime_field)
3751: goto out;
3752:
3753: /* Q != infinity */
3754: if (EC_POINT_is_at_infinity(group, public))
3755: goto out;
3756:
3757: if ((x = BN_CTX_get(bnctx)) == NULL ||
3758: (y = BN_CTX_get(bnctx)) == NULL ||
3759: (order = BN_CTX_get(bnctx)) == NULL ||
3760: (tmp = BN_CTX_get(bnctx)) == NULL) {
3761: ret = SSH_ERR_ALLOC_FAIL;
3762: goto out;
3763: }
3764:
3765: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3766: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3767: EC_POINT_get_affine_coordinates_GFp(group, public,
3768: x, y, bnctx) != 1) {
3769: ret = SSH_ERR_LIBCRYPTO_ERROR;
3770: goto out;
3771: }
3772: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3773: BN_num_bits(y) <= BN_num_bits(order) / 2)
3774: goto out;
3775:
3776: /* nQ == infinity (n == order of subgroup) */
3777: if ((nq = EC_POINT_new(group)) == NULL) {
3778: ret = SSH_ERR_ALLOC_FAIL;
3779: goto out;
3780: }
3781: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3782: ret = SSH_ERR_LIBCRYPTO_ERROR;
3783: goto out;
3784: }
3785: if (EC_POINT_is_at_infinity(group, nq) != 1)
3786: goto out;
3787:
3788: /* x < order - 1, y < order - 1 */
3789: if (!BN_sub(tmp, order, BN_value_one())) {
3790: ret = SSH_ERR_LIBCRYPTO_ERROR;
3791: goto out;
3792: }
3793: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3794: goto out;
3795: ret = 0;
3796: out:
3797: BN_CTX_free(bnctx);
1.60 jsing 3798: EC_POINT_free(nq);
1.1 djm 3799: return ret;
3800: }
3801:
3802: int
3803: sshkey_ec_validate_private(const EC_KEY *key)
3804: {
3805: BN_CTX *bnctx;
3806: BIGNUM *order, *tmp;
3807: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3808:
3809: if ((bnctx = BN_CTX_new()) == NULL)
3810: return SSH_ERR_ALLOC_FAIL;
3811: BN_CTX_start(bnctx);
3812:
3813: if ((order = BN_CTX_get(bnctx)) == NULL ||
3814: (tmp = BN_CTX_get(bnctx)) == NULL) {
3815: ret = SSH_ERR_ALLOC_FAIL;
3816: goto out;
3817: }
3818:
3819: /* log2(private) > log2(order)/2 */
3820: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3821: ret = SSH_ERR_LIBCRYPTO_ERROR;
3822: goto out;
3823: }
3824: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3825: BN_num_bits(order) / 2)
3826: goto out;
3827:
3828: /* private < order - 1 */
3829: if (!BN_sub(tmp, order, BN_value_one())) {
3830: ret = SSH_ERR_LIBCRYPTO_ERROR;
3831: goto out;
3832: }
3833: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3834: goto out;
3835: ret = 0;
3836: out:
3837: BN_CTX_free(bnctx);
3838: return ret;
3839: }
3840:
3841: void
3842: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3843: {
3844: BIGNUM *x, *y;
3845: BN_CTX *bnctx;
3846:
3847: if (point == NULL) {
3848: fputs("point=(NULL)\n", stderr);
3849: return;
3850: }
3851: if ((bnctx = BN_CTX_new()) == NULL) {
3852: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3853: return;
3854: }
3855: BN_CTX_start(bnctx);
3856: if ((x = BN_CTX_get(bnctx)) == NULL ||
3857: (y = BN_CTX_get(bnctx)) == NULL) {
3858: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3859: return;
3860: }
3861: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3862: NID_X9_62_prime_field) {
3863: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3864: return;
3865: }
3866: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3867: bnctx) != 1) {
3868: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3869: __func__);
3870: return;
3871: }
3872: fputs("x=", stderr);
3873: BN_print_fp(stderr, x);
3874: fputs("\ny=", stderr);
3875: BN_print_fp(stderr, y);
3876: fputs("\n", stderr);
3877: BN_CTX_free(bnctx);
3878: }
3879:
3880: void
3881: sshkey_dump_ec_key(const EC_KEY *key)
3882: {
3883: const BIGNUM *exponent;
3884:
3885: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3886: EC_KEY_get0_public_key(key));
3887: fputs("exponent=", stderr);
3888: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3889: fputs("(NULL)", stderr);
3890: else
3891: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3892: fputs("\n", stderr);
3893: }
3894: #endif /* WITH_OPENSSL */
3895:
3896: static int
1.76 djm 3897: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3898: const char *passphrase, const char *comment, const char *ciphername,
3899: int rounds)
3900: {
1.4 djm 3901: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3902: u_char salt[SALT_LEN];
1.4 djm 3903: char *b64 = NULL;
1.1 djm 3904: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3905: u_int check;
3906: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3907: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3908: const struct sshcipher *cipher;
3909: const char *kdfname = KDFNAME;
3910: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3911:
3912: if (rounds <= 0)
3913: rounds = DEFAULT_ROUNDS;
3914: if (passphrase == NULL || !strlen(passphrase)) {
3915: ciphername = "none";
3916: kdfname = "none";
3917: } else if (ciphername == NULL)
3918: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3919: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3920: r = SSH_ERR_INVALID_ARGUMENT;
3921: goto out;
3922: }
3923:
3924: if ((kdf = sshbuf_new()) == NULL ||
3925: (encoded = sshbuf_new()) == NULL ||
3926: (encrypted = sshbuf_new()) == NULL) {
3927: r = SSH_ERR_ALLOC_FAIL;
3928: goto out;
3929: }
3930: blocksize = cipher_blocksize(cipher);
3931: keylen = cipher_keylen(cipher);
3932: ivlen = cipher_ivlen(cipher);
3933: authlen = cipher_authlen(cipher);
3934: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3935: r = SSH_ERR_ALLOC_FAIL;
3936: goto out;
3937: }
3938: if (strcmp(kdfname, "bcrypt") == 0) {
3939: arc4random_buf(salt, SALT_LEN);
3940: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3941: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3942: r = SSH_ERR_INVALID_ARGUMENT;
3943: goto out;
3944: }
3945: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3946: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3947: goto out;
3948: } else if (strcmp(kdfname, "none") != 0) {
3949: /* Unsupported KDF type */
3950: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3951: goto out;
3952: }
3953: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3954: key + keylen, ivlen, 1)) != 0)
3955: goto out;
3956:
3957: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3958: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3959: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3960: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3961: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3962: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3963: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3964: goto out;
3965:
3966: /* set up the buffer that will be encrypted */
3967:
3968: /* Random check bytes */
3969: check = arc4random();
3970: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3971: (r = sshbuf_put_u32(encrypted, check)) != 0)
3972: goto out;
3973:
3974: /* append private key and comment*/
1.62 markus 3975: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3976: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3977: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3978: goto out;
3979:
3980: /* padding */
3981: i = 0;
3982: while (sshbuf_len(encrypted) % blocksize) {
3983: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3984: goto out;
3985: }
3986:
3987: /* length in destination buffer */
3988: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3989: goto out;
3990:
3991: /* encrypt */
3992: if ((r = sshbuf_reserve(encoded,
3993: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3994: goto out;
1.36 djm 3995: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3996: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3997: goto out;
3998:
1.81 djm 3999: sshbuf_reset(blob);
1.1 djm 4000:
1.81 djm 4001: /* assemble uuencoded key */
4002: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
4003: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
4004: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 4005: goto out;
4006:
4007: /* success */
4008: r = 0;
4009:
4010: out:
4011: sshbuf_free(kdf);
4012: sshbuf_free(encoded);
4013: sshbuf_free(encrypted);
1.36 djm 4014: cipher_free(ciphercontext);
1.1 djm 4015: explicit_bzero(salt, sizeof(salt));
4016: if (key != NULL) {
4017: explicit_bzero(key, keylen + ivlen);
4018: free(key);
4019: }
4020: if (pubkeyblob != NULL) {
4021: explicit_bzero(pubkeyblob, pubkeylen);
4022: free(pubkeyblob);
4023: }
4024: if (b64 != NULL) {
4025: explicit_bzero(b64, strlen(b64));
4026: free(b64);
4027: }
4028: return r;
4029: }
4030:
4031: static int
4032: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
4033: struct sshkey **keyp, char **commentp)
4034: {
4035: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
4036: const struct sshcipher *cipher = NULL;
4037: const u_char *cp;
4038: int r = SSH_ERR_INTERNAL_ERROR;
4039: size_t encoded_len;
1.18 djm 4040: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 4041: struct sshbuf *encoded = NULL, *decoded = NULL;
4042: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 4043: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 4044: struct sshkey *k = NULL;
4045: u_char *key = NULL, *salt = NULL, *dp, pad, last;
4046: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
4047:
4048: if (keyp != NULL)
4049: *keyp = NULL;
4050: if (commentp != NULL)
4051: *commentp = NULL;
4052:
4053: if ((encoded = sshbuf_new()) == NULL ||
4054: (decoded = sshbuf_new()) == NULL ||
4055: (decrypted = sshbuf_new()) == NULL) {
4056: r = SSH_ERR_ALLOC_FAIL;
4057: goto out;
4058: }
4059:
4060: /* check preamble */
4061: cp = sshbuf_ptr(blob);
4062: encoded_len = sshbuf_len(blob);
4063: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
4064: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
4065: r = SSH_ERR_INVALID_FORMAT;
4066: goto out;
4067: }
4068: cp += MARK_BEGIN_LEN;
4069: encoded_len -= MARK_BEGIN_LEN;
4070:
4071: /* Look for end marker, removing whitespace as we go */
4072: while (encoded_len > 0) {
4073: if (*cp != '\n' && *cp != '\r') {
4074: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
4075: goto out;
4076: }
4077: last = *cp;
4078: encoded_len--;
4079: cp++;
4080: if (last == '\n') {
4081: if (encoded_len >= MARK_END_LEN &&
4082: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
4083: /* \0 terminate */
4084: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
4085: goto out;
4086: break;
4087: }
4088: }
4089: }
4090: if (encoded_len == 0) {
4091: r = SSH_ERR_INVALID_FORMAT;
4092: goto out;
4093: }
4094:
4095: /* decode base64 */
1.4 djm 4096: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 4097: goto out;
4098:
4099: /* check magic */
4100: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
4101: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
4102: r = SSH_ERR_INVALID_FORMAT;
4103: goto out;
4104: }
4105: /* parse public portion of key */
4106: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
4107: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
4108: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
4109: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
4110: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
4111: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
4112: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
4113: goto out;
4114:
4115: if ((cipher = cipher_by_name(ciphername)) == NULL) {
4116: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4117: goto out;
4118: }
4119: if ((passphrase == NULL || strlen(passphrase) == 0) &&
4120: strcmp(ciphername, "none") != 0) {
4121: /* passphrase required */
4122: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4123: goto out;
4124: }
4125: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
4126: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
4127: goto out;
4128: }
4129: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
4130: r = SSH_ERR_INVALID_FORMAT;
4131: goto out;
4132: }
4133: if (nkeys != 1) {
4134: /* XXX only one key supported */
4135: r = SSH_ERR_INVALID_FORMAT;
4136: goto out;
4137: }
4138:
4139: /* check size of encrypted key blob */
4140: blocksize = cipher_blocksize(cipher);
4141: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
4142: r = SSH_ERR_INVALID_FORMAT;
4143: goto out;
4144: }
4145:
4146: /* setup key */
4147: keylen = cipher_keylen(cipher);
4148: ivlen = cipher_ivlen(cipher);
1.18 djm 4149: authlen = cipher_authlen(cipher);
1.1 djm 4150: if ((key = calloc(1, keylen + ivlen)) == NULL) {
4151: r = SSH_ERR_ALLOC_FAIL;
4152: goto out;
4153: }
4154: if (strcmp(kdfname, "bcrypt") == 0) {
4155: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4156: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4157: goto out;
4158: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4159: key, keylen + ivlen, rounds) < 0) {
4160: r = SSH_ERR_INVALID_FORMAT;
4161: goto out;
4162: }
4163: }
4164:
1.18 djm 4165: /* check that an appropriate amount of auth data is present */
1.84 djm 4166: if (sshbuf_len(decoded) < authlen ||
4167: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4168: r = SSH_ERR_INVALID_FORMAT;
4169: goto out;
4170: }
4171:
1.1 djm 4172: /* decrypt private portion of key */
4173: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4174: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4175: key + keylen, ivlen, 0)) != 0)
4176: goto out;
1.36 djm 4177: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4178: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4179: /* an integrity error here indicates an incorrect passphrase */
4180: if (r == SSH_ERR_MAC_INVALID)
4181: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4182: goto out;
4183: }
1.18 djm 4184: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4185: goto out;
4186: /* there should be no trailing data */
4187: if (sshbuf_len(decoded) != 0) {
4188: r = SSH_ERR_INVALID_FORMAT;
4189: goto out;
4190: }
4191:
4192: /* check check bytes */
4193: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4194: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4195: goto out;
4196: if (check1 != check2) {
4197: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4198: goto out;
4199: }
4200:
4201: /* Load the private key and comment */
4202: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4203: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4204: goto out;
4205:
4206: /* Check deterministic padding */
4207: i = 0;
4208: while (sshbuf_len(decrypted)) {
4209: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
4210: goto out;
4211: if (pad != (++i & 0xff)) {
4212: r = SSH_ERR_INVALID_FORMAT;
4213: goto out;
4214: }
4215: }
4216:
4217: /* XXX decode pubkey and check against private */
4218:
4219: /* success */
4220: r = 0;
4221: if (keyp != NULL) {
4222: *keyp = k;
4223: k = NULL;
4224: }
4225: if (commentp != NULL) {
4226: *commentp = comment;
4227: comment = NULL;
4228: }
4229: out:
4230: pad = 0;
1.36 djm 4231: cipher_free(ciphercontext);
1.1 djm 4232: free(ciphername);
4233: free(kdfname);
4234: free(comment);
4235: if (salt != NULL) {
4236: explicit_bzero(salt, slen);
4237: free(salt);
4238: }
4239: if (key != NULL) {
4240: explicit_bzero(key, keylen + ivlen);
4241: free(key);
4242: }
4243: sshbuf_free(encoded);
4244: sshbuf_free(decoded);
4245: sshbuf_free(kdf);
4246: sshbuf_free(decrypted);
4247: sshkey_free(k);
4248: return r;
4249: }
4250:
4251:
4252: #ifdef WITH_OPENSSL
1.80 djm 4253: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4254: static int
1.80 djm 4255: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4256: int format, const char *_passphrase, const char *comment)
1.1 djm 4257: {
1.76 djm 4258: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4259: int success, r;
4260: int blen, len = strlen(_passphrase);
4261: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4262: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4263: char *bptr;
1.1 djm 4264: BIO *bio = NULL;
1.76 djm 4265: struct sshbuf *blob;
1.80 djm 4266: EVP_PKEY *pkey = NULL;
1.1 djm 4267:
4268: if (len > 0 && len <= 4)
4269: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4270: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4271: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4272: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4273: r = SSH_ERR_ALLOC_FAIL;
4274: goto out;
4275: }
4276: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4277: r = SSH_ERR_ALLOC_FAIL;
4278: goto out;
1.76 djm 4279: }
4280: if ((r = sshkey_unshield_private(key)) != 0)
4281: goto out;
1.1 djm 4282:
4283: switch (key->type) {
4284: case KEY_DSA:
1.80 djm 4285: if (format == SSHKEY_PRIVATE_PEM) {
4286: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4287: cipher, passphrase, len, NULL, NULL);
4288: } else {
4289: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4290: }
1.1 djm 4291: break;
4292: case KEY_ECDSA:
1.80 djm 4293: if (format == SSHKEY_PRIVATE_PEM) {
4294: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4295: cipher, passphrase, len, NULL, NULL);
4296: } else {
4297: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4298: }
1.1 djm 4299: break;
4300: case KEY_RSA:
1.80 djm 4301: if (format == SSHKEY_PRIVATE_PEM) {
4302: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4303: cipher, passphrase, len, NULL, NULL);
4304: } else {
4305: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4306: }
1.1 djm 4307: break;
4308: default:
4309: success = 0;
4310: break;
4311: }
4312: if (success == 0) {
4313: r = SSH_ERR_LIBCRYPTO_ERROR;
4314: goto out;
4315: }
1.80 djm 4316: if (format == SSHKEY_PRIVATE_PKCS8) {
4317: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4318: passphrase, len, NULL, NULL)) == 0) {
4319: r = SSH_ERR_LIBCRYPTO_ERROR;
4320: goto out;
4321: }
4322: }
1.1 djm 4323: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4324: r = SSH_ERR_INTERNAL_ERROR;
4325: goto out;
4326: }
4327: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4328: goto out;
4329: r = 0;
4330: out:
1.76 djm 4331: if (was_shielded)
4332: r = sshkey_shield_private(key);
4333: if (r == 0)
4334: r = sshbuf_putb(buf, blob);
1.80 djm 4335:
4336: EVP_PKEY_free(pkey);
1.76 djm 4337: sshbuf_free(blob);
1.1 djm 4338: BIO_free(bio);
4339: return r;
4340: }
4341: #endif /* WITH_OPENSSL */
4342:
4343: /* Serialise "key" to buffer "blob" */
4344: int
4345: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4346: const char *passphrase, const char *comment,
1.80 djm 4347: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4348: {
4349: switch (key->type) {
1.9 markus 4350: #ifdef WITH_OPENSSL
1.1 djm 4351: case KEY_DSA:
4352: case KEY_ECDSA:
4353: case KEY_RSA:
1.80 djm 4354: break; /* see below */
1.1 djm 4355: #endif /* WITH_OPENSSL */
4356: case KEY_ED25519:
1.90 markus 4357: case KEY_ED25519_SK:
1.62 markus 4358: #ifdef WITH_XMSS
4359: case KEY_XMSS:
4360: #endif /* WITH_XMSS */
1.85 djm 4361: #ifdef WITH_OPENSSL
4362: case KEY_ECDSA_SK:
4363: #endif /* WITH_OPENSSL */
1.1 djm 4364: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4365: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4366: default:
4367: return SSH_ERR_KEY_TYPE_UNKNOWN;
4368: }
1.80 djm 4369:
4370: #ifdef WITH_OPENSSL
4371: switch (format) {
4372: case SSHKEY_PRIVATE_OPENSSH:
4373: return sshkey_private_to_blob2(key, blob, passphrase,
4374: comment, openssh_format_cipher, openssh_format_rounds);
4375: case SSHKEY_PRIVATE_PEM:
4376: case SSHKEY_PRIVATE_PKCS8:
4377: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4378: format, passphrase, comment);
4379: default:
4380: return SSH_ERR_INVALID_ARGUMENT;
4381: }
4382: #endif /* WITH_OPENSSL */
1.1 djm 4383: }
4384:
4385: #ifdef WITH_OPENSSL
1.8 djm 4386: static int
1.52 djm 4387: translate_libcrypto_error(unsigned long pem_err)
4388: {
4389: int pem_reason = ERR_GET_REASON(pem_err);
4390:
4391: switch (ERR_GET_LIB(pem_err)) {
4392: case ERR_LIB_PEM:
4393: switch (pem_reason) {
4394: case PEM_R_BAD_PASSWORD_READ:
4395: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4396: case PEM_R_BAD_DECRYPT:
4397: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4398: default:
4399: return SSH_ERR_INVALID_FORMAT;
4400: }
4401: case ERR_LIB_EVP:
4402: switch (pem_reason) {
4403: case EVP_R_BAD_DECRYPT:
4404: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4405: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4406: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4407: #endif
1.52 djm 4408: case EVP_R_DECODE_ERROR:
4409: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4410: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4411: #endif
4412: return SSH_ERR_INVALID_FORMAT;
4413: default:
4414: return SSH_ERR_LIBCRYPTO_ERROR;
4415: }
4416: case ERR_LIB_ASN1:
4417: return SSH_ERR_INVALID_FORMAT;
4418: }
4419: return SSH_ERR_LIBCRYPTO_ERROR;
4420: }
4421:
4422: static void
4423: clear_libcrypto_errors(void)
4424: {
4425: while (ERR_get_error() != 0)
4426: ;
4427: }
4428:
4429: /*
4430: * Translate OpenSSL error codes to determine whether
4431: * passphrase is required/incorrect.
4432: */
4433: static int
4434: convert_libcrypto_error(void)
4435: {
4436: /*
4437: * Some password errors are reported at the beginning
4438: * of the error queue.
4439: */
4440: if (translate_libcrypto_error(ERR_peek_error()) ==
4441: SSH_ERR_KEY_WRONG_PASSPHRASE)
4442: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4443: return translate_libcrypto_error(ERR_peek_last_error());
4444: }
4445:
4446: static int
1.1 djm 4447: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4448: const char *passphrase, struct sshkey **keyp)
1.1 djm 4449: {
4450: EVP_PKEY *pk = NULL;
4451: struct sshkey *prv = NULL;
4452: BIO *bio = NULL;
4453: int r;
4454:
1.32 djm 4455: if (keyp != NULL)
4456: *keyp = NULL;
1.1 djm 4457:
4458: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4459: return SSH_ERR_ALLOC_FAIL;
4460: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4461: (int)sshbuf_len(blob)) {
4462: r = SSH_ERR_ALLOC_FAIL;
4463: goto out;
4464: }
4465:
1.52 djm 4466: clear_libcrypto_errors();
1.1 djm 4467: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4468: (char *)passphrase)) == NULL) {
1.71 djm 4469: /*
4470: * libcrypto may return various ASN.1 errors when attempting
4471: * to parse a key with an incorrect passphrase.
4472: * Treat all format errors as "incorrect passphrase" if a
4473: * passphrase was supplied.
4474: */
4475: if (passphrase != NULL && *passphrase != '\0')
4476: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4477: else
4478: r = convert_libcrypto_error();
1.1 djm 4479: goto out;
4480: }
1.69 djm 4481: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4482: (type == KEY_UNSPEC || type == KEY_RSA)) {
4483: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4484: r = SSH_ERR_ALLOC_FAIL;
4485: goto out;
4486: }
4487: prv->rsa = EVP_PKEY_get1_RSA(pk);
4488: prv->type = KEY_RSA;
4489: #ifdef DEBUG_PK
4490: RSA_print_fp(stderr, prv->rsa, 8);
4491: #endif
4492: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4493: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4494: goto out;
4495: }
1.69 djm 4496: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4497: goto out;
1.69 djm 4498: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4499: (type == KEY_UNSPEC || type == KEY_DSA)) {
4500: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4501: r = SSH_ERR_ALLOC_FAIL;
4502: goto out;
4503: }
4504: prv->dsa = EVP_PKEY_get1_DSA(pk);
4505: prv->type = KEY_DSA;
4506: #ifdef DEBUG_PK
4507: DSA_print_fp(stderr, prv->dsa, 8);
4508: #endif
1.69 djm 4509: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4510: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4511: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4512: r = SSH_ERR_ALLOC_FAIL;
4513: goto out;
4514: }
4515: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4516: prv->type = KEY_ECDSA;
4517: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4518: if (prv->ecdsa_nid == -1 ||
4519: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4520: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4521: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4522: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4523: r = SSH_ERR_INVALID_FORMAT;
4524: goto out;
4525: }
4526: #ifdef DEBUG_PK
4527: if (prv != NULL && prv->ecdsa != NULL)
4528: sshkey_dump_ec_key(prv->ecdsa);
4529: #endif
4530: } else {
4531: r = SSH_ERR_INVALID_FORMAT;
4532: goto out;
4533: }
4534: r = 0;
1.32 djm 4535: if (keyp != NULL) {
4536: *keyp = prv;
4537: prv = NULL;
4538: }
1.1 djm 4539: out:
4540: BIO_free(bio);
1.60 jsing 4541: EVP_PKEY_free(pk);
1.30 mmcc 4542: sshkey_free(prv);
1.1 djm 4543: return r;
4544: }
4545: #endif /* WITH_OPENSSL */
4546:
4547: int
4548: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4549: const char *passphrase, struct sshkey **keyp, char **commentp)
4550: {
1.42 djm 4551: int r = SSH_ERR_INTERNAL_ERROR;
4552:
1.32 djm 4553: if (keyp != NULL)
4554: *keyp = NULL;
1.1 djm 4555: if (commentp != NULL)
4556: *commentp = NULL;
4557:
4558: switch (type) {
1.9 markus 4559: #ifdef WITH_OPENSSL
1.1 djm 4560: case KEY_DSA:
4561: case KEY_ECDSA:
4562: case KEY_RSA:
1.8 djm 4563: return sshkey_parse_private_pem_fileblob(blob, type,
4564: passphrase, keyp);
1.1 djm 4565: #endif /* WITH_OPENSSL */
4566: case KEY_ED25519:
1.62 markus 4567: #ifdef WITH_XMSS
4568: case KEY_XMSS:
4569: #endif /* WITH_XMSS */
1.1 djm 4570: return sshkey_parse_private2(blob, type, passphrase,
4571: keyp, commentp);
4572: case KEY_UNSPEC:
1.42 djm 4573: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4574: commentp);
4575: /* Do not fallback to PEM parser if only passphrase is wrong. */
4576: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4577: return r;
1.1 djm 4578: #ifdef WITH_OPENSSL
1.8 djm 4579: return sshkey_parse_private_pem_fileblob(blob, type,
4580: passphrase, keyp);
1.1 djm 4581: #else
4582: return SSH_ERR_INVALID_FORMAT;
4583: #endif /* WITH_OPENSSL */
4584: default:
4585: return SSH_ERR_KEY_TYPE_UNKNOWN;
4586: }
4587: }
4588:
4589: int
4590: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4591: struct sshkey **keyp, char **commentp)
1.1 djm 4592: {
4593: if (keyp != NULL)
4594: *keyp = NULL;
4595: if (commentp != NULL)
4596: *commentp = NULL;
4597:
1.23 tim 4598: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4599: passphrase, keyp, commentp);
1.1 djm 4600: }
1.62 markus 4601:
4602: #ifdef WITH_XMSS
4603: /*
4604: * serialize the key with the current state and forward the state
4605: * maxsign times.
4606: */
4607: int
1.77 djm 4608: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4609: u_int32_t maxsign, sshkey_printfn *pr)
4610: {
4611: int r, rupdate;
4612:
4613: if (maxsign == 0 ||
4614: sshkey_type_plain(k->type) != KEY_XMSS)
4615: return sshkey_private_serialize_opt(k, b,
4616: SSHKEY_SERIALIZE_DEFAULT);
4617: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4618: (r = sshkey_private_serialize_opt(k, b,
4619: SSHKEY_SERIALIZE_STATE)) != 0 ||
4620: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4621: goto out;
4622: r = 0;
4623: out:
4624: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4625: if (r == 0)
4626: r = rupdate;
4627: }
4628: return r;
4629: }
4630:
4631: u_int32_t
4632: sshkey_signatures_left(const struct sshkey *k)
4633: {
4634: if (sshkey_type_plain(k->type) == KEY_XMSS)
4635: return sshkey_xmss_signatures_left(k);
4636: return 0;
4637: }
4638:
4639: int
4640: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4641: {
4642: if (sshkey_type_plain(k->type) != KEY_XMSS)
4643: return SSH_ERR_INVALID_ARGUMENT;
4644: return sshkey_xmss_enable_maxsign(k, maxsign);
4645: }
4646:
4647: int
4648: sshkey_set_filename(struct sshkey *k, const char *filename)
4649: {
4650: if (k == NULL)
4651: return SSH_ERR_INVALID_ARGUMENT;
4652: if (sshkey_type_plain(k->type) != KEY_XMSS)
4653: return 0;
4654: if (filename == NULL)
4655: return SSH_ERR_INVALID_ARGUMENT;
4656: if ((k->xmss_filename = strdup(filename)) == NULL)
4657: return SSH_ERR_ALLOC_FAIL;
4658: return 0;
4659: }
4660: #else
4661: int
1.76 djm 4662: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4663: u_int32_t maxsign, sshkey_printfn *pr)
4664: {
4665: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4666: }
4667:
4668: u_int32_t
4669: sshkey_signatures_left(const struct sshkey *k)
4670: {
4671: return 0;
4672: }
4673:
4674: int
4675: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4676: {
4677: return SSH_ERR_INVALID_ARGUMENT;
4678: }
4679:
4680: int
4681: sshkey_set_filename(struct sshkey *k, const char *filename)
4682: {
4683: if (k == NULL)
4684: return SSH_ERR_INVALID_ARGUMENT;
4685: return 0;
4686: }
4687: #endif /* WITH_XMSS */
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