Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.89
1.89 ! markus 1: /* $OpenBSD: sshkey.c,v 1.88 2019/11/12 19:30:50 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 },
1.62 markus 103: #ifdef WITH_XMSS
1.65 djm 104: { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 },
105: { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL,
1.62 markus 106: KEY_XMSS_CERT, 0, 1, 0 },
107: #endif /* WITH_XMSS */
1.1 djm 108: #ifdef WITH_OPENSSL
1.65 djm 109: { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 },
110: { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 },
111: { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 },
112: { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 },
113: { "ecdsa-sha2-nistp256", "ECDSA", NULL,
114: KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
115: { "ecdsa-sha2-nistp384", "ECDSA", NULL,
116: KEY_ECDSA, NID_secp384r1, 0, 0 },
117: { "ecdsa-sha2-nistp521", "ECDSA", NULL,
118: KEY_ECDSA, NID_secp521r1, 0, 0 },
1.85 djm 119: { "sk-ecdsa-sha2-nistp256@openssh.com", "ECDSA-SK", NULL,
120: KEY_ECDSA_SK, NID_X9_62_prime256v1, 0, 0 },
1.65 djm 121: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL,
122: KEY_RSA_CERT, 0, 1, 0 },
123: { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 124: "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 125: { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 126: "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 127: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL,
128: KEY_DSA_CERT, 0, 1, 0 },
129: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 130: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.65 djm 131: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 132: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.65 djm 133: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL,
134: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.85 djm 135: { "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-SK-CERT", NULL,
136: KEY_ECDSA_SK_CERT, NID_X9_62_prime256v1, 1, 0 },
1.1 djm 137: #endif /* WITH_OPENSSL */
1.65 djm 138: { NULL, NULL, NULL, -1, -1, 0, 0 }
1.1 djm 139: };
140:
141: const char *
142: sshkey_type(const struct sshkey *k)
143: {
144: const struct keytype *kt;
145:
146: for (kt = keytypes; kt->type != -1; kt++) {
147: if (kt->type == k->type)
148: return kt->shortname;
149: }
150: return "unknown";
151: }
152:
153: static const char *
154: sshkey_ssh_name_from_type_nid(int type, int nid)
155: {
156: const struct keytype *kt;
157:
158: for (kt = keytypes; kt->type != -1; kt++) {
159: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
160: return kt->name;
161: }
162: return "ssh-unknown";
163: }
164:
165: int
166: sshkey_type_is_cert(int type)
167: {
168: const struct keytype *kt;
169:
170: for (kt = keytypes; kt->type != -1; kt++) {
171: if (kt->type == type)
172: return kt->cert;
173: }
174: return 0;
175: }
176:
177: const char *
178: sshkey_ssh_name(const struct sshkey *k)
179: {
180: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
181: }
182:
183: const char *
184: sshkey_ssh_name_plain(const struct sshkey *k)
185: {
186: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
187: k->ecdsa_nid);
188: }
189:
190: int
191: sshkey_type_from_name(const char *name)
192: {
193: const struct keytype *kt;
194:
195: for (kt = keytypes; kt->type != -1; kt++) {
196: /* Only allow shortname matches for plain key types */
197: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
198: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
199: return kt->type;
200: }
201: return KEY_UNSPEC;
202: }
203:
1.85 djm 204: static int
205: key_type_is_ecdsa_variant(int type)
206: {
207: switch (type) {
208: case KEY_ECDSA:
209: case KEY_ECDSA_CERT:
210: case KEY_ECDSA_SK:
211: case KEY_ECDSA_SK_CERT:
212: return 1;
213: }
214: return 0;
215: }
216:
1.1 djm 217: int
218: sshkey_ecdsa_nid_from_name(const char *name)
219: {
220: const struct keytype *kt;
221:
1.4 djm 222: for (kt = keytypes; kt->type != -1; kt++) {
1.85 djm 223: if (!key_type_is_ecdsa_variant(kt->type))
1.4 djm 224: continue;
225: if (kt->name != NULL && strcmp(name, kt->name) == 0)
226: return kt->nid;
227: }
1.1 djm 228: return -1;
229: }
230:
231: char *
1.45 djm 232: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 233: {
234: char *tmp, *ret = NULL;
235: size_t nlen, rlen = 0;
236: const struct keytype *kt;
237:
238: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 239: if (kt->name == NULL)
240: continue;
241: if (!include_sigonly && kt->sigonly)
1.1 djm 242: continue;
243: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
244: continue;
245: if (ret != NULL)
1.38 djm 246: ret[rlen++] = sep;
1.1 djm 247: nlen = strlen(kt->name);
248: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
249: free(ret);
250: return NULL;
251: }
252: ret = tmp;
253: memcpy(ret + rlen, kt->name, nlen + 1);
254: rlen += nlen;
255: }
256: return ret;
257: }
258:
259: int
1.11 djm 260: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 261: {
262: char *s, *cp, *p;
1.11 djm 263: const struct keytype *kt;
264: int type;
1.1 djm 265:
266: if (names == NULL || strcmp(names, "") == 0)
267: return 0;
268: if ((s = cp = strdup(names)) == NULL)
269: return 0;
270: for ((p = strsep(&cp, ",")); p && *p != '\0';
271: (p = strsep(&cp, ","))) {
1.11 djm 272: type = sshkey_type_from_name(p);
273: if (type == KEY_UNSPEC) {
274: if (allow_wildcard) {
275: /*
276: * Try matching key types against the string.
277: * If any has a positive or negative match then
278: * the component is accepted.
279: */
280: for (kt = keytypes; kt->type != -1; kt++) {
281: if (match_pattern_list(kt->name,
1.17 djm 282: p, 0) != 0)
1.11 djm 283: break;
284: }
285: if (kt->type != -1)
286: continue;
287: }
1.1 djm 288: free(s);
289: return 0;
290: }
291: }
292: free(s);
293: return 1;
294: }
295:
296: u_int
297: sshkey_size(const struct sshkey *k)
298: {
1.69 djm 299: #ifdef WITH_OPENSSL
300: const BIGNUM *rsa_n, *dsa_p;
301: #endif /* WITH_OPENSSL */
302:
1.1 djm 303: switch (k->type) {
304: #ifdef WITH_OPENSSL
305: case KEY_RSA:
306: case KEY_RSA_CERT:
1.69 djm 307: if (k->rsa == NULL)
308: return 0;
309: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
310: return BN_num_bits(rsa_n);
1.1 djm 311: case KEY_DSA:
312: case KEY_DSA_CERT:
1.69 djm 313: if (k->dsa == NULL)
314: return 0;
315: DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL);
316: return BN_num_bits(dsa_p);
1.1 djm 317: case KEY_ECDSA:
318: case KEY_ECDSA_CERT:
1.85 djm 319: case KEY_ECDSA_SK:
320: case KEY_ECDSA_SK_CERT:
1.1 djm 321: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
322: #endif /* WITH_OPENSSL */
323: case KEY_ED25519:
324: case KEY_ED25519_CERT:
1.62 markus 325: case KEY_XMSS:
326: case KEY_XMSS_CERT:
1.1 djm 327: return 256; /* XXX */
328: }
329: return 0;
330: }
331:
332: static int
333: sshkey_type_is_valid_ca(int type)
334: {
335: switch (type) {
336: case KEY_RSA:
337: case KEY_DSA:
338: case KEY_ECDSA:
1.85 djm 339: case KEY_ECDSA_SK:
1.1 djm 340: case KEY_ED25519:
1.62 markus 341: case KEY_XMSS:
1.1 djm 342: return 1;
343: default:
344: return 0;
345: }
346: }
347:
348: int
349: sshkey_is_cert(const struct sshkey *k)
350: {
351: if (k == NULL)
352: return 0;
353: return sshkey_type_is_cert(k->type);
354: }
355:
356: /* Return the cert-less equivalent to a certified key type */
357: int
358: sshkey_type_plain(int type)
359: {
360: switch (type) {
361: case KEY_RSA_CERT:
362: return KEY_RSA;
363: case KEY_DSA_CERT:
364: return KEY_DSA;
365: case KEY_ECDSA_CERT:
366: return KEY_ECDSA;
1.85 djm 367: case KEY_ECDSA_SK_CERT:
368: return KEY_ECDSA_SK;
1.1 djm 369: case KEY_ED25519_CERT:
370: return KEY_ED25519;
1.62 markus 371: case KEY_XMSS_CERT:
372: return KEY_XMSS;
1.1 djm 373: default:
374: return type;
375: }
376: }
377:
378: #ifdef WITH_OPENSSL
379: /* XXX: these are really begging for a table-driven approach */
380: int
381: sshkey_curve_name_to_nid(const char *name)
382: {
383: if (strcmp(name, "nistp256") == 0)
384: return NID_X9_62_prime256v1;
385: else if (strcmp(name, "nistp384") == 0)
386: return NID_secp384r1;
387: else if (strcmp(name, "nistp521") == 0)
388: return NID_secp521r1;
389: else
390: return -1;
391: }
392:
393: u_int
394: sshkey_curve_nid_to_bits(int nid)
395: {
396: switch (nid) {
397: case NID_X9_62_prime256v1:
398: return 256;
399: case NID_secp384r1:
400: return 384;
401: case NID_secp521r1:
402: return 521;
403: default:
404: return 0;
405: }
406: }
407:
408: int
409: sshkey_ecdsa_bits_to_nid(int bits)
410: {
411: switch (bits) {
412: case 256:
413: return NID_X9_62_prime256v1;
414: case 384:
415: return NID_secp384r1;
416: case 521:
417: return NID_secp521r1;
418: default:
419: return -1;
420: }
421: }
422:
423: const char *
424: sshkey_curve_nid_to_name(int nid)
425: {
426: switch (nid) {
427: case NID_X9_62_prime256v1:
428: return "nistp256";
429: case NID_secp384r1:
430: return "nistp384";
431: case NID_secp521r1:
432: return "nistp521";
433: default:
434: return NULL;
435: }
436: }
437:
438: int
439: sshkey_ec_nid_to_hash_alg(int nid)
440: {
441: int kbits = sshkey_curve_nid_to_bits(nid);
442:
443: if (kbits <= 0)
444: return -1;
445:
446: /* RFC5656 section 6.2.1 */
447: if (kbits <= 256)
448: return SSH_DIGEST_SHA256;
449: else if (kbits <= 384)
450: return SSH_DIGEST_SHA384;
451: else
452: return SSH_DIGEST_SHA512;
453: }
454: #endif /* WITH_OPENSSL */
455:
456: static void
457: cert_free(struct sshkey_cert *cert)
458: {
459: u_int i;
460:
461: if (cert == NULL)
462: return;
1.31 mmcc 463: sshbuf_free(cert->certblob);
464: sshbuf_free(cert->critical);
465: sshbuf_free(cert->extensions);
1.29 mmcc 466: free(cert->key_id);
1.1 djm 467: for (i = 0; i < cert->nprincipals; i++)
468: free(cert->principals[i]);
1.29 mmcc 469: free(cert->principals);
1.30 mmcc 470: sshkey_free(cert->signature_key);
1.67 djm 471: free(cert->signature_type);
1.61 jsing 472: freezero(cert, sizeof(*cert));
1.1 djm 473: }
474:
475: static struct sshkey_cert *
476: cert_new(void)
477: {
478: struct sshkey_cert *cert;
479:
480: if ((cert = calloc(1, sizeof(*cert))) == NULL)
481: return NULL;
482: if ((cert->certblob = sshbuf_new()) == NULL ||
483: (cert->critical = sshbuf_new()) == NULL ||
484: (cert->extensions = sshbuf_new()) == NULL) {
485: cert_free(cert);
486: return NULL;
487: }
488: cert->key_id = NULL;
489: cert->principals = NULL;
490: cert->signature_key = NULL;
1.67 djm 491: cert->signature_type = NULL;
1.1 djm 492: return cert;
493: }
494:
495: struct sshkey *
496: sshkey_new(int type)
497: {
498: struct sshkey *k;
499: #ifdef WITH_OPENSSL
500: RSA *rsa;
501: DSA *dsa;
502: #endif /* WITH_OPENSSL */
503:
504: if ((k = calloc(1, sizeof(*k))) == NULL)
505: return NULL;
506: k->type = type;
507: k->ecdsa = NULL;
508: k->ecdsa_nid = -1;
509: k->dsa = NULL;
510: k->rsa = NULL;
511: k->cert = NULL;
512: k->ed25519_sk = NULL;
513: k->ed25519_pk = NULL;
1.62 markus 514: k->xmss_sk = NULL;
515: k->xmss_pk = NULL;
1.1 djm 516: switch (k->type) {
517: #ifdef WITH_OPENSSL
518: case KEY_RSA:
519: case KEY_RSA_CERT:
1.69 djm 520: if ((rsa = RSA_new()) == NULL) {
1.1 djm 521: free(k);
522: return NULL;
523: }
524: k->rsa = rsa;
525: break;
526: case KEY_DSA:
527: case KEY_DSA_CERT:
1.69 djm 528: if ((dsa = DSA_new()) == NULL) {
1.1 djm 529: free(k);
530: return NULL;
531: }
532: k->dsa = dsa;
533: break;
534: case KEY_ECDSA:
535: case KEY_ECDSA_CERT:
1.85 djm 536: case KEY_ECDSA_SK:
537: case KEY_ECDSA_SK_CERT:
1.1 djm 538: /* Cannot do anything until we know the group */
539: break;
540: #endif /* WITH_OPENSSL */
541: case KEY_ED25519:
542: case KEY_ED25519_CERT:
1.62 markus 543: case KEY_XMSS:
544: case KEY_XMSS_CERT:
1.1 djm 545: /* no need to prealloc */
546: break;
547: case KEY_UNSPEC:
548: break;
549: default:
550: free(k);
551: return NULL;
552: }
553:
554: if (sshkey_is_cert(k)) {
555: if ((k->cert = cert_new()) == NULL) {
556: sshkey_free(k);
557: return NULL;
558: }
559: }
560:
561: return k;
562: }
563:
564: void
565: sshkey_free(struct sshkey *k)
566: {
567: if (k == NULL)
568: return;
569: switch (k->type) {
570: #ifdef WITH_OPENSSL
571: case KEY_RSA:
572: case KEY_RSA_CERT:
1.60 jsing 573: RSA_free(k->rsa);
1.1 djm 574: k->rsa = NULL;
575: break;
576: case KEY_DSA:
577: case KEY_DSA_CERT:
1.60 jsing 578: DSA_free(k->dsa);
1.1 djm 579: k->dsa = NULL;
580: break;
1.85 djm 581: case KEY_ECDSA_SK:
582: case KEY_ECDSA_SK_CERT:
583: free(k->sk_application);
584: sshbuf_free(k->sk_key_handle);
585: sshbuf_free(k->sk_reserved);
586: /* FALLTHROUGH */
1.1 djm 587: case KEY_ECDSA:
588: case KEY_ECDSA_CERT:
1.60 jsing 589: EC_KEY_free(k->ecdsa);
1.1 djm 590: k->ecdsa = NULL;
591: break;
592: #endif /* WITH_OPENSSL */
593: case KEY_ED25519:
594: case KEY_ED25519_CERT:
1.61 jsing 595: freezero(k->ed25519_pk, ED25519_PK_SZ);
596: k->ed25519_pk = NULL;
597: freezero(k->ed25519_sk, ED25519_SK_SZ);
598: k->ed25519_sk = NULL;
1.1 djm 599: break;
1.62 markus 600: #ifdef WITH_XMSS
601: case KEY_XMSS:
602: case KEY_XMSS_CERT:
603: freezero(k->xmss_pk, sshkey_xmss_pklen(k));
604: k->xmss_pk = NULL;
605: freezero(k->xmss_sk, sshkey_xmss_sklen(k));
606: k->xmss_sk = NULL;
607: sshkey_xmss_free_state(k);
608: free(k->xmss_name);
609: k->xmss_name = NULL;
610: free(k->xmss_filename);
611: k->xmss_filename = NULL;
612: break;
613: #endif /* WITH_XMSS */
1.1 djm 614: case KEY_UNSPEC:
615: break;
616: default:
617: break;
618: }
619: if (sshkey_is_cert(k))
620: cert_free(k->cert);
1.76 djm 621: freezero(k->shielded_private, k->shielded_len);
622: freezero(k->shield_prekey, k->shield_prekey_len);
1.61 jsing 623: freezero(k, sizeof(*k));
1.1 djm 624: }
625:
626: static int
627: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
628: {
629: if (a == NULL && b == NULL)
630: return 1;
631: if (a == NULL || b == NULL)
632: return 0;
633: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
634: return 0;
635: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
636: sshbuf_len(a->certblob)) != 0)
637: return 0;
638: return 1;
639: }
640:
641: /*
642: * Compare public portions of key only, allowing comparisons between
643: * certificates and plain keys too.
644: */
645: int
646: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
647: {
648: #ifdef WITH_OPENSSL
649: BN_CTX *bnctx;
1.69 djm 650: const BIGNUM *rsa_e_a, *rsa_n_a;
651: const BIGNUM *rsa_e_b, *rsa_n_b;
652: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
653: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 654: #endif /* WITH_OPENSSL */
655:
656: if (a == NULL || b == NULL ||
657: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
658: return 0;
659:
660: switch (a->type) {
661: #ifdef WITH_OPENSSL
662: case KEY_RSA_CERT:
663: case KEY_RSA:
1.69 djm 664: if (a->rsa == NULL || b->rsa == NULL)
665: return 0;
666: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
667: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
668: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
669: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 670: case KEY_DSA_CERT:
671: case KEY_DSA:
1.69 djm 672: if (a->dsa == NULL || b->dsa == NULL)
673: return 0;
674: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
675: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
676: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
677: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
678: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
679: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
680: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
681: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.85 djm 682: case KEY_ECDSA_SK:
683: case KEY_ECDSA_SK_CERT:
684: if (a->sk_application == NULL || b->sk_application == NULL)
685: return 0;
686: if (strcmp(a->sk_application, b->sk_application) != 0)
687: return 0;
688: /* FALLTHROUGH */
1.1 djm 689: case KEY_ECDSA_CERT:
690: case KEY_ECDSA:
691: if (a->ecdsa == NULL || b->ecdsa == NULL ||
692: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
693: EC_KEY_get0_public_key(b->ecdsa) == NULL)
694: return 0;
695: if ((bnctx = BN_CTX_new()) == NULL)
696: return 0;
697: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
698: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
699: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
700: EC_KEY_get0_public_key(a->ecdsa),
701: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
702: BN_CTX_free(bnctx);
703: return 0;
704: }
705: BN_CTX_free(bnctx);
706: return 1;
707: #endif /* WITH_OPENSSL */
708: case KEY_ED25519:
709: case KEY_ED25519_CERT:
710: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
711: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 712: #ifdef WITH_XMSS
713: case KEY_XMSS:
714: case KEY_XMSS_CERT:
715: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
716: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
717: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
718: #endif /* WITH_XMSS */
1.1 djm 719: default:
720: return 0;
721: }
722: /* NOTREACHED */
723: }
724:
725: int
726: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
727: {
728: if (a == NULL || b == NULL || a->type != b->type)
729: return 0;
730: if (sshkey_is_cert(a)) {
731: if (!cert_compare(a->cert, b->cert))
732: return 0;
733: }
734: return sshkey_equal_public(a, b);
735: }
736:
737: static int
1.62 markus 738: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
739: enum sshkey_serialize_rep opts)
1.1 djm 740: {
741: int type, ret = SSH_ERR_INTERNAL_ERROR;
742: const char *typename;
1.69 djm 743: #ifdef WITH_OPENSSL
744: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
745: #endif /* WITH_OPENSSL */
1.1 djm 746:
747: if (key == NULL)
748: return SSH_ERR_INVALID_ARGUMENT;
749:
1.19 djm 750: if (sshkey_is_cert(key)) {
751: if (key->cert == NULL)
752: return SSH_ERR_EXPECTED_CERT;
753: if (sshbuf_len(key->cert->certblob) == 0)
754: return SSH_ERR_KEY_LACKS_CERTBLOB;
755: }
1.1 djm 756: type = force_plain ? sshkey_type_plain(key->type) : key->type;
757: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
758:
759: switch (type) {
760: #ifdef WITH_OPENSSL
761: case KEY_DSA_CERT:
762: case KEY_ECDSA_CERT:
1.85 djm 763: case KEY_ECDSA_SK_CERT:
1.1 djm 764: case KEY_RSA_CERT:
765: #endif /* WITH_OPENSSL */
766: case KEY_ED25519_CERT:
1.62 markus 767: #ifdef WITH_XMSS
768: case KEY_XMSS_CERT:
769: #endif /* WITH_XMSS */
1.1 djm 770: /* Use the existing blob */
771: /* XXX modified flag? */
772: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
773: return ret;
774: break;
775: #ifdef WITH_OPENSSL
776: case KEY_DSA:
777: if (key->dsa == NULL)
778: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 779: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
780: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 781: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 782: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
783: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
784: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
785: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 786: return ret;
787: break;
788: case KEY_ECDSA:
1.85 djm 789: case KEY_ECDSA_SK:
1.1 djm 790: if (key->ecdsa == NULL)
791: return SSH_ERR_INVALID_ARGUMENT;
792: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
793: (ret = sshbuf_put_cstring(b,
794: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
795: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
796: return ret;
1.85 djm 797: if (type == KEY_ECDSA_SK) {
798: if ((ret = sshbuf_put_cstring(b,
799: key->sk_application)) != 0)
800: return ret;
801: }
1.1 djm 802: break;
803: case KEY_RSA:
804: if (key->rsa == NULL)
805: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 806: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 807: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 808: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
809: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 810: return ret;
811: break;
812: #endif /* WITH_OPENSSL */
813: case KEY_ED25519:
814: if (key->ed25519_pk == NULL)
815: return SSH_ERR_INVALID_ARGUMENT;
816: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
817: (ret = sshbuf_put_string(b,
818: key->ed25519_pk, ED25519_PK_SZ)) != 0)
819: return ret;
820: break;
1.62 markus 821: #ifdef WITH_XMSS
822: case KEY_XMSS:
823: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
824: sshkey_xmss_pklen(key) == 0)
825: return SSH_ERR_INVALID_ARGUMENT;
826: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
827: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
828: (ret = sshbuf_put_string(b,
829: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
830: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
831: return ret;
832: break;
833: #endif /* WITH_XMSS */
1.1 djm 834: default:
835: return SSH_ERR_KEY_TYPE_UNKNOWN;
836: }
837: return 0;
838: }
839:
840: int
1.14 djm 841: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 842: {
1.62 markus 843: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 844: }
845:
846: int
1.62 markus 847: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
848: enum sshkey_serialize_rep opts)
1.14 djm 849: {
850: struct sshbuf *tmp;
851: int r;
852:
853: if ((tmp = sshbuf_new()) == NULL)
854: return SSH_ERR_ALLOC_FAIL;
1.62 markus 855: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 856: if (r == 0)
857: r = sshbuf_put_stringb(b, tmp);
858: sshbuf_free(tmp);
859: return r;
860: }
861:
862: int
1.62 markus 863: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
864: {
865: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
866: }
867:
868: int
1.14 djm 869: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 870: {
1.62 markus 871: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 872: }
873:
874: static int
1.62 markus 875: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
876: enum sshkey_serialize_rep opts)
1.1 djm 877: {
878: int ret = SSH_ERR_INTERNAL_ERROR;
879: size_t len;
880: struct sshbuf *b = NULL;
881:
882: if (lenp != NULL)
883: *lenp = 0;
884: if (blobp != NULL)
885: *blobp = NULL;
886: if ((b = sshbuf_new()) == NULL)
887: return SSH_ERR_ALLOC_FAIL;
1.62 markus 888: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 889: goto out;
890: len = sshbuf_len(b);
891: if (lenp != NULL)
892: *lenp = len;
893: if (blobp != NULL) {
894: if ((*blobp = malloc(len)) == NULL) {
895: ret = SSH_ERR_ALLOC_FAIL;
896: goto out;
897: }
898: memcpy(*blobp, sshbuf_ptr(b), len);
899: }
900: ret = 0;
901: out:
902: sshbuf_free(b);
903: return ret;
904: }
905:
906: int
907: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
908: {
1.62 markus 909: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 910: }
911:
912: int
913: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
914: {
1.62 markus 915: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 916: }
917:
918: int
1.7 djm 919: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 920: u_char **retp, size_t *lenp)
921: {
922: u_char *blob = NULL, *ret = NULL;
923: size_t blob_len = 0;
1.7 djm 924: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 925:
926: if (retp != NULL)
927: *retp = NULL;
928: if (lenp != NULL)
929: *lenp = 0;
1.7 djm 930: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 931: r = SSH_ERR_INVALID_ARGUMENT;
932: goto out;
933: }
1.62 markus 934: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
935: != 0)
1.1 djm 936: goto out;
937: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
938: r = SSH_ERR_ALLOC_FAIL;
939: goto out;
940: }
1.7 djm 941: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 942: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
943: goto out;
944: /* success */
945: if (retp != NULL) {
946: *retp = ret;
947: ret = NULL;
948: }
949: if (lenp != NULL)
1.7 djm 950: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 951: r = 0;
952: out:
953: free(ret);
954: if (blob != NULL) {
955: explicit_bzero(blob, blob_len);
956: free(blob);
957: }
958: return r;
959: }
960:
961: static char *
1.7 djm 962: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
963: {
964: char *ret;
965: size_t plen = strlen(alg) + 1;
966: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
967:
968: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
969: return NULL;
970: strlcpy(ret, alg, rlen);
971: strlcat(ret, ":", rlen);
972: if (dgst_raw_len == 0)
973: return ret;
1.79 dtucker 974: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 975: freezero(ret, rlen);
1.7 djm 976: return NULL;
977: }
978: /* Trim padding characters from end */
979: ret[strcspn(ret, "=")] = '\0';
980: return ret;
981: }
982:
983: static char *
984: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 985: {
1.7 djm 986: char *retval, hex[5];
987: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 988:
1.7 djm 989: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 990: return NULL;
1.7 djm 991: strlcpy(retval, alg, rlen);
992: strlcat(retval, ":", rlen);
1.1 djm 993: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 994: snprintf(hex, sizeof(hex), "%s%02x",
995: i > 0 ? ":" : "", dgst_raw[i]);
996: strlcat(retval, hex, rlen);
1.1 djm 997: }
998: return retval;
999: }
1000:
1001: static char *
1002: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
1003: {
1004: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
1005: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
1006: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1007: u_int i, j = 0, rounds, seed = 1;
1008: char *retval;
1009:
1010: rounds = (dgst_raw_len / 2) + 1;
1011: if ((retval = calloc(rounds, 6)) == NULL)
1012: return NULL;
1013: retval[j++] = 'x';
1014: for (i = 0; i < rounds; i++) {
1015: u_int idx0, idx1, idx2, idx3, idx4;
1016: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
1017: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1018: seed) % 6;
1019: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
1020: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1021: (seed / 6)) % 6;
1022: retval[j++] = vowels[idx0];
1023: retval[j++] = consonants[idx1];
1024: retval[j++] = vowels[idx2];
1025: if ((i + 1) < rounds) {
1026: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
1027: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
1028: retval[j++] = consonants[idx3];
1029: retval[j++] = '-';
1030: retval[j++] = consonants[idx4];
1031: seed = ((seed * 5) +
1032: ((((u_int)(dgst_raw[2 * i])) * 7) +
1033: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1034: }
1035: } else {
1036: idx0 = seed % 6;
1037: idx1 = 16;
1038: idx2 = seed / 6;
1039: retval[j++] = vowels[idx0];
1040: retval[j++] = consonants[idx1];
1041: retval[j++] = vowels[idx2];
1042: }
1043: }
1044: retval[j++] = 'x';
1045: retval[j++] = '\0';
1046: return retval;
1047: }
1048:
1049: /*
1050: * Draw an ASCII-Art representing the fingerprint so human brain can
1051: * profit from its built-in pattern recognition ability.
1052: * This technique is called "random art" and can be found in some
1053: * scientific publications like this original paper:
1054: *
1055: * "Hash Visualization: a New Technique to improve Real-World Security",
1056: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1057: * Techniques and E-Commerce (CrypTEC '99)
1058: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1059: *
1060: * The subject came up in a talk by Dan Kaminsky, too.
1061: *
1062: * If you see the picture is different, the key is different.
1063: * If the picture looks the same, you still know nothing.
1064: *
1065: * The algorithm used here is a worm crawling over a discrete plane,
1066: * leaving a trace (augmenting the field) everywhere it goes.
1067: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1068: * makes the respective movement vector be ignored for this turn.
1069: * Graphs are not unambiguous, because circles in graphs can be
1070: * walked in either direction.
1071: */
1072:
1073: /*
1074: * Field sizes for the random art. Have to be odd, so the starting point
1075: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1076: * Else pictures would be too dense, and drawing the frame would
1077: * fail, too, because the key type would not fit in anymore.
1078: */
1079: #define FLDBASE 8
1080: #define FLDSIZE_Y (FLDBASE + 1)
1081: #define FLDSIZE_X (FLDBASE * 2 + 1)
1082: static char *
1.7 djm 1083: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1084: const struct sshkey *k)
1085: {
1086: /*
1087: * Chars to be used after each other every time the worm
1088: * intersects with itself. Matter of taste.
1089: */
1090: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1091: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1092: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1093: size_t i, tlen, hlen;
1.1 djm 1094: u_int b;
1.3 djm 1095: int x, y, r;
1.1 djm 1096: size_t len = strlen(augmentation_string) - 1;
1097:
1098: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1099: return NULL;
1100:
1101: /* initialize field */
1102: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1103: x = FLDSIZE_X / 2;
1104: y = FLDSIZE_Y / 2;
1105:
1106: /* process raw key */
1107: for (i = 0; i < dgst_raw_len; i++) {
1108: int input;
1109: /* each byte conveys four 2-bit move commands */
1110: input = dgst_raw[i];
1111: for (b = 0; b < 4; b++) {
1112: /* evaluate 2 bit, rest is shifted later */
1113: x += (input & 0x1) ? 1 : -1;
1114: y += (input & 0x2) ? 1 : -1;
1115:
1116: /* assure we are still in bounds */
1.37 deraadt 1117: x = MAXIMUM(x, 0);
1118: y = MAXIMUM(y, 0);
1119: x = MINIMUM(x, FLDSIZE_X - 1);
1120: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1121:
1122: /* augment the field */
1123: if (field[x][y] < len - 2)
1124: field[x][y]++;
1125: input = input >> 2;
1126: }
1127: }
1128:
1129: /* mark starting point and end point*/
1130: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1131: field[x][y] = len;
1132:
1.3 djm 1133: /* assemble title */
1134: r = snprintf(title, sizeof(title), "[%s %u]",
1135: sshkey_type(k), sshkey_size(k));
1136: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1137: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1138: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1139: tlen = (r <= 0) ? 0 : strlen(title);
1140:
1141: /* assemble hash ID. */
1142: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1143: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1144:
1145: /* output upper border */
1.3 djm 1146: p = retval;
1147: *p++ = '+';
1148: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1149: *p++ = '-';
1150: memcpy(p, title, tlen);
1151: p += tlen;
1.7 djm 1152: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1153: *p++ = '-';
1154: *p++ = '+';
1155: *p++ = '\n';
1156:
1157: /* output content */
1158: for (y = 0; y < FLDSIZE_Y; y++) {
1159: *p++ = '|';
1160: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1161: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1162: *p++ = '|';
1163: *p++ = '\n';
1164: }
1165:
1166: /* output lower border */
1167: *p++ = '+';
1.7 djm 1168: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1169: *p++ = '-';
1170: memcpy(p, hash, hlen);
1171: p += hlen;
1172: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1173: *p++ = '-';
1174: *p++ = '+';
1175:
1176: return retval;
1177: }
1178:
1179: char *
1.7 djm 1180: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1181: enum sshkey_fp_rep dgst_rep)
1182: {
1183: char *retval = NULL;
1184: u_char *dgst_raw;
1185: size_t dgst_raw_len;
1186:
1.7 djm 1187: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1188: return NULL;
1189: switch (dgst_rep) {
1.7 djm 1190: case SSH_FP_DEFAULT:
1191: if (dgst_alg == SSH_DIGEST_MD5) {
1192: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1193: dgst_raw, dgst_raw_len);
1194: } else {
1195: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1196: dgst_raw, dgst_raw_len);
1197: }
1198: break;
1.1 djm 1199: case SSH_FP_HEX:
1.7 djm 1200: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1201: dgst_raw, dgst_raw_len);
1202: break;
1203: case SSH_FP_BASE64:
1204: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1205: dgst_raw, dgst_raw_len);
1.1 djm 1206: break;
1207: case SSH_FP_BUBBLEBABBLE:
1208: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1209: break;
1210: case SSH_FP_RANDOMART:
1.7 djm 1211: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1212: dgst_raw, dgst_raw_len, k);
1.1 djm 1213: break;
1214: default:
1215: explicit_bzero(dgst_raw, dgst_raw_len);
1216: free(dgst_raw);
1217: return NULL;
1218: }
1219: explicit_bzero(dgst_raw, dgst_raw_len);
1220: free(dgst_raw);
1221: return retval;
1222: }
1223:
1.63 djm 1224: static int
1225: peek_type_nid(const char *s, size_t l, int *nid)
1226: {
1227: const struct keytype *kt;
1228:
1229: for (kt = keytypes; kt->type != -1; kt++) {
1230: if (kt->name == NULL || strlen(kt->name) != l)
1231: continue;
1232: if (memcmp(s, kt->name, l) == 0) {
1233: *nid = -1;
1.85 djm 1234: if (key_type_is_ecdsa_variant(kt->type))
1.63 djm 1235: *nid = kt->nid;
1236: return kt->type;
1237: }
1238: }
1239: return KEY_UNSPEC;
1240: }
1241:
1.1 djm 1242:
1.63 djm 1243: /* XXX this can now be made const char * */
1.1 djm 1244: int
1245: sshkey_read(struct sshkey *ret, char **cpp)
1246: {
1247: struct sshkey *k;
1.63 djm 1248: char *cp, *blobcopy;
1249: size_t space;
1.1 djm 1250: int r, type, curve_nid = -1;
1251: struct sshbuf *blob;
1.44 dtucker 1252:
1253: if (ret == NULL)
1254: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1255:
1256: switch (ret->type) {
1257: case KEY_UNSPEC:
1258: case KEY_RSA:
1259: case KEY_DSA:
1260: case KEY_ECDSA:
1.85 djm 1261: case KEY_ECDSA_SK:
1.1 djm 1262: case KEY_ED25519:
1263: case KEY_DSA_CERT:
1264: case KEY_ECDSA_CERT:
1.85 djm 1265: case KEY_ECDSA_SK_CERT:
1.1 djm 1266: case KEY_RSA_CERT:
1267: case KEY_ED25519_CERT:
1.62 markus 1268: #ifdef WITH_XMSS
1269: case KEY_XMSS:
1270: case KEY_XMSS_CERT:
1271: #endif /* WITH_XMSS */
1.63 djm 1272: break; /* ok */
1273: default:
1274: return SSH_ERR_INVALID_ARGUMENT;
1275: }
1276:
1277: /* Decode type */
1278: cp = *cpp;
1279: space = strcspn(cp, " \t");
1280: if (space == strlen(cp))
1281: return SSH_ERR_INVALID_FORMAT;
1282: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1283: return SSH_ERR_INVALID_FORMAT;
1284:
1285: /* skip whitespace */
1286: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1287: ;
1288: if (*cp == '\0')
1289: return SSH_ERR_INVALID_FORMAT;
1290: if (ret->type != KEY_UNSPEC && ret->type != type)
1291: return SSH_ERR_KEY_TYPE_MISMATCH;
1292: if ((blob = sshbuf_new()) == NULL)
1293: return SSH_ERR_ALLOC_FAIL;
1294:
1295: /* find end of keyblob and decode */
1296: space = strcspn(cp, " \t");
1297: if ((blobcopy = strndup(cp, space)) == NULL) {
1298: sshbuf_free(blob);
1299: return SSH_ERR_ALLOC_FAIL;
1300: }
1301: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1302: free(blobcopy);
1303: sshbuf_free(blob);
1304: return r;
1305: }
1306: free(blobcopy);
1307: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1308: sshbuf_free(blob);
1.63 djm 1309: return r;
1310: }
1311: sshbuf_free(blob);
1312:
1313: /* skip whitespace and leave cp at start of comment */
1314: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1315: ;
1316:
1317: /* ensure type of blob matches type at start of line */
1318: if (k->type != type) {
1319: sshkey_free(k);
1320: return SSH_ERR_KEY_TYPE_MISMATCH;
1321: }
1.85 djm 1322: if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1.63 djm 1323: sshkey_free(k);
1324: return SSH_ERR_EC_CURVE_MISMATCH;
1325: }
1326:
1327: /* Fill in ret from parsed key */
1328: ret->type = type;
1329: if (sshkey_is_cert(ret)) {
1330: if (!sshkey_is_cert(k)) {
1.1 djm 1331: sshkey_free(k);
1.63 djm 1332: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1333: }
1.63 djm 1334: if (ret->cert != NULL)
1335: cert_free(ret->cert);
1336: ret->cert = k->cert;
1337: k->cert = NULL;
1338: }
1339: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1340: #ifdef WITH_OPENSSL
1.63 djm 1341: case KEY_RSA:
1342: RSA_free(ret->rsa);
1343: ret->rsa = k->rsa;
1344: k->rsa = NULL;
1.1 djm 1345: #ifdef DEBUG_PK
1.63 djm 1346: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1347: #endif
1.63 djm 1348: break;
1349: case KEY_DSA:
1350: DSA_free(ret->dsa);
1351: ret->dsa = k->dsa;
1352: k->dsa = NULL;
1.1 djm 1353: #ifdef DEBUG_PK
1.63 djm 1354: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1355: #endif
1.63 djm 1356: break;
1357: case KEY_ECDSA:
1358: EC_KEY_free(ret->ecdsa);
1359: ret->ecdsa = k->ecdsa;
1360: ret->ecdsa_nid = k->ecdsa_nid;
1361: k->ecdsa = NULL;
1362: k->ecdsa_nid = -1;
1.1 djm 1363: #ifdef DEBUG_PK
1.63 djm 1364: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1365: #endif
1.63 djm 1366: break;
1.85 djm 1367: case KEY_ECDSA_SK:
1368: EC_KEY_free(ret->ecdsa);
1369: ret->ecdsa = k->ecdsa;
1370: ret->ecdsa_nid = k->ecdsa_nid;
1371: ret->sk_application = k->sk_application;
1372: k->ecdsa = NULL;
1373: k->ecdsa_nid = -1;
1374: k->sk_application = NULL;
1375: #ifdef DEBUG_PK
1376: sshkey_dump_ec_key(ret->ecdsa);
1377: fprintf(stderr, "App: %s\n", ret->sk_application);
1378: #endif
1379: break;
1.1 djm 1380: #endif /* WITH_OPENSSL */
1.63 djm 1381: case KEY_ED25519:
1382: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1383: ret->ed25519_pk = k->ed25519_pk;
1384: k->ed25519_pk = NULL;
1.1 djm 1385: #ifdef DEBUG_PK
1.63 djm 1386: /* XXX */
1.1 djm 1387: #endif
1.63 djm 1388: break;
1.62 markus 1389: #ifdef WITH_XMSS
1.63 djm 1390: case KEY_XMSS:
1391: free(ret->xmss_pk);
1392: ret->xmss_pk = k->xmss_pk;
1393: k->xmss_pk = NULL;
1394: free(ret->xmss_state);
1395: ret->xmss_state = k->xmss_state;
1396: k->xmss_state = NULL;
1397: free(ret->xmss_name);
1398: ret->xmss_name = k->xmss_name;
1399: k->xmss_name = NULL;
1400: free(ret->xmss_filename);
1401: ret->xmss_filename = k->xmss_filename;
1402: k->xmss_filename = NULL;
1.62 markus 1403: #ifdef DEBUG_PK
1.63 djm 1404: /* XXX */
1.62 markus 1405: #endif
1.63 djm 1406: break;
1.62 markus 1407: #endif /* WITH_XMSS */
1.63 djm 1408: default:
1.1 djm 1409: sshkey_free(k);
1.63 djm 1410: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1411: }
1.63 djm 1412: sshkey_free(k);
1413:
1414: /* success */
1415: *cpp = cp;
1416: return 0;
1.1 djm 1417: }
1418:
1419: int
1.19 djm 1420: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1421: {
1.19 djm 1422: int r = SSH_ERR_INTERNAL_ERROR;
1423: struct sshbuf *b = NULL;
1.1 djm 1424: char *uu = NULL;
1.19 djm 1425:
1426: if (b64p != NULL)
1427: *b64p = NULL;
1428: if ((b = sshbuf_new()) == NULL)
1429: return SSH_ERR_ALLOC_FAIL;
1430: if ((r = sshkey_putb(key, b)) != 0)
1431: goto out;
1.81 djm 1432: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1433: r = SSH_ERR_ALLOC_FAIL;
1434: goto out;
1435: }
1436: /* Success */
1437: if (b64p != NULL) {
1438: *b64p = uu;
1439: uu = NULL;
1440: }
1441: r = 0;
1442: out:
1443: sshbuf_free(b);
1444: free(uu);
1445: return r;
1446: }
1447:
1.52 djm 1448: int
1.19 djm 1449: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1450: {
1451: int r = SSH_ERR_INTERNAL_ERROR;
1452: char *uu = NULL;
1453:
1.48 djm 1454: if ((r = sshkey_to_base64(key, &uu)) != 0)
1455: goto out;
1456: if ((r = sshbuf_putf(b, "%s %s",
1457: sshkey_ssh_name(key), uu)) != 0)
1458: goto out;
1.19 djm 1459: r = 0;
1460: out:
1461: free(uu);
1462: return r;
1463: }
1464:
1465: int
1466: sshkey_write(const struct sshkey *key, FILE *f)
1467: {
1468: struct sshbuf *b = NULL;
1469: int r = SSH_ERR_INTERNAL_ERROR;
1470:
1471: if ((b = sshbuf_new()) == NULL)
1472: return SSH_ERR_ALLOC_FAIL;
1473: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1474: goto out;
1475: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1476: if (feof(f))
1477: errno = EPIPE;
1.19 djm 1478: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1479: goto out;
1480: }
1.19 djm 1481: /* Success */
1482: r = 0;
1.1 djm 1483: out:
1.19 djm 1484: sshbuf_free(b);
1485: return r;
1.1 djm 1486: }
1487:
1488: const char *
1489: sshkey_cert_type(const struct sshkey *k)
1490: {
1491: switch (k->cert->type) {
1492: case SSH2_CERT_TYPE_USER:
1493: return "user";
1494: case SSH2_CERT_TYPE_HOST:
1495: return "host";
1496: default:
1497: return "unknown";
1498: }
1499: }
1500:
1501: #ifdef WITH_OPENSSL
1502: static int
1503: rsa_generate_private_key(u_int bits, RSA **rsap)
1504: {
1505: RSA *private = NULL;
1506: BIGNUM *f4 = NULL;
1507: int ret = SSH_ERR_INTERNAL_ERROR;
1508:
1.49 djm 1509: if (rsap == NULL)
1510: return SSH_ERR_INVALID_ARGUMENT;
1511: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1512: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1513: return SSH_ERR_KEY_LENGTH;
1.1 djm 1514: *rsap = NULL;
1515: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1516: ret = SSH_ERR_ALLOC_FAIL;
1517: goto out;
1518: }
1519: if (!BN_set_word(f4, RSA_F4) ||
1520: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1521: ret = SSH_ERR_LIBCRYPTO_ERROR;
1522: goto out;
1523: }
1524: *rsap = private;
1525: private = NULL;
1526: ret = 0;
1527: out:
1.60 jsing 1528: RSA_free(private);
1529: BN_free(f4);
1.1 djm 1530: return ret;
1531: }
1532:
1533: static int
1534: dsa_generate_private_key(u_int bits, DSA **dsap)
1535: {
1536: DSA *private;
1537: int ret = SSH_ERR_INTERNAL_ERROR;
1538:
1.49 djm 1539: if (dsap == NULL)
1.1 djm 1540: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1541: if (bits != 1024)
1542: return SSH_ERR_KEY_LENGTH;
1.1 djm 1543: if ((private = DSA_new()) == NULL) {
1544: ret = SSH_ERR_ALLOC_FAIL;
1545: goto out;
1546: }
1547: *dsap = NULL;
1548: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1549: NULL, NULL) || !DSA_generate_key(private)) {
1550: ret = SSH_ERR_LIBCRYPTO_ERROR;
1551: goto out;
1552: }
1553: *dsap = private;
1554: private = NULL;
1555: ret = 0;
1556: out:
1.60 jsing 1557: DSA_free(private);
1.1 djm 1558: return ret;
1559: }
1560:
1561: int
1562: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1563: {
1564: EC_GROUP *eg;
1565: int nids[] = {
1566: NID_X9_62_prime256v1,
1567: NID_secp384r1,
1568: NID_secp521r1,
1569: -1
1570: };
1571: int nid;
1572: u_int i;
1573: BN_CTX *bnctx;
1574: const EC_GROUP *g = EC_KEY_get0_group(k);
1575:
1576: /*
1577: * The group may be stored in a ASN.1 encoded private key in one of two
1578: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1579: * or explicit group parameters encoded into the key blob. Only the
1580: * "named group" case sets the group NID for us, but we can figure
1581: * it out for the other case by comparing against all the groups that
1582: * are supported.
1583: */
1584: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1585: return nid;
1586: if ((bnctx = BN_CTX_new()) == NULL)
1587: return -1;
1588: for (i = 0; nids[i] != -1; i++) {
1589: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1590: BN_CTX_free(bnctx);
1591: return -1;
1592: }
1593: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1594: break;
1595: EC_GROUP_free(eg);
1596: }
1597: BN_CTX_free(bnctx);
1598: if (nids[i] != -1) {
1599: /* Use the group with the NID attached */
1600: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1601: if (EC_KEY_set_group(k, eg) != 1) {
1602: EC_GROUP_free(eg);
1603: return -1;
1604: }
1605: }
1606: return nids[i];
1607: }
1608:
1609: static int
1610: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1611: {
1612: EC_KEY *private;
1613: int ret = SSH_ERR_INTERNAL_ERROR;
1614:
1.50 djm 1615: if (nid == NULL || ecdsap == NULL)
1.1 djm 1616: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1617: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1618: return SSH_ERR_KEY_LENGTH;
1.1 djm 1619: *ecdsap = NULL;
1620: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1621: ret = SSH_ERR_ALLOC_FAIL;
1622: goto out;
1623: }
1624: if (EC_KEY_generate_key(private) != 1) {
1625: ret = SSH_ERR_LIBCRYPTO_ERROR;
1626: goto out;
1627: }
1628: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1629: *ecdsap = private;
1630: private = NULL;
1631: ret = 0;
1632: out:
1.60 jsing 1633: EC_KEY_free(private);
1.1 djm 1634: return ret;
1635: }
1636: #endif /* WITH_OPENSSL */
1637:
1638: int
1639: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1640: {
1641: struct sshkey *k;
1642: int ret = SSH_ERR_INTERNAL_ERROR;
1643:
1644: if (keyp == NULL)
1645: return SSH_ERR_INVALID_ARGUMENT;
1646: *keyp = NULL;
1647: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1648: return SSH_ERR_ALLOC_FAIL;
1649: switch (type) {
1650: case KEY_ED25519:
1651: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1652: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1653: ret = SSH_ERR_ALLOC_FAIL;
1654: break;
1655: }
1656: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1657: ret = 0;
1658: break;
1.62 markus 1659: #ifdef WITH_XMSS
1660: case KEY_XMSS:
1661: ret = sshkey_xmss_generate_private_key(k, bits);
1662: break;
1663: #endif /* WITH_XMSS */
1.1 djm 1664: #ifdef WITH_OPENSSL
1665: case KEY_DSA:
1666: ret = dsa_generate_private_key(bits, &k->dsa);
1667: break;
1668: case KEY_ECDSA:
1669: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1670: &k->ecdsa);
1671: break;
1672: case KEY_RSA:
1673: ret = rsa_generate_private_key(bits, &k->rsa);
1674: break;
1675: #endif /* WITH_OPENSSL */
1676: default:
1677: ret = SSH_ERR_INVALID_ARGUMENT;
1678: }
1679: if (ret == 0) {
1680: k->type = type;
1681: *keyp = k;
1682: } else
1683: sshkey_free(k);
1684: return ret;
1685: }
1686:
1687: int
1688: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1689: {
1690: u_int i;
1691: const struct sshkey_cert *from;
1692: struct sshkey_cert *to;
1.67 djm 1693: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1694:
1.67 djm 1695: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1696: return SSH_ERR_INVALID_ARGUMENT;
1697:
1.67 djm 1698: if ((to = cert_new()) == NULL)
1.1 djm 1699: return SSH_ERR_ALLOC_FAIL;
1700:
1.67 djm 1701: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1702: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1703: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1704: goto out;
1.1 djm 1705:
1706: to->serial = from->serial;
1707: to->type = from->type;
1708: if (from->key_id == NULL)
1709: to->key_id = NULL;
1.67 djm 1710: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1711: r = SSH_ERR_ALLOC_FAIL;
1712: goto out;
1713: }
1.1 djm 1714: to->valid_after = from->valid_after;
1715: to->valid_before = from->valid_before;
1716: if (from->signature_key == NULL)
1717: to->signature_key = NULL;
1.67 djm 1718: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1719: &to->signature_key)) != 0)
1.67 djm 1720: goto out;
1721: if (from->signature_type != NULL &&
1722: (to->signature_type = strdup(from->signature_type)) == NULL) {
1723: r = SSH_ERR_ALLOC_FAIL;
1724: goto out;
1725: }
1726: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1727: r = SSH_ERR_INVALID_ARGUMENT;
1728: goto out;
1729: }
1.1 djm 1730: if (from->nprincipals > 0) {
1731: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1732: sizeof(*to->principals))) == NULL) {
1733: r = SSH_ERR_ALLOC_FAIL;
1734: goto out;
1735: }
1.1 djm 1736: for (i = 0; i < from->nprincipals; i++) {
1737: to->principals[i] = strdup(from->principals[i]);
1738: if (to->principals[i] == NULL) {
1739: to->nprincipals = i;
1.67 djm 1740: r = SSH_ERR_ALLOC_FAIL;
1741: goto out;
1.1 djm 1742: }
1743: }
1744: }
1745: to->nprincipals = from->nprincipals;
1.67 djm 1746:
1747: /* success */
1748: cert_free(to_key->cert);
1749: to_key->cert = to;
1750: to = NULL;
1751: r = 0;
1752: out:
1753: cert_free(to);
1754: return r;
1.1 djm 1755: }
1756:
1757: int
1758: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1759: {
1760: struct sshkey *n = NULL;
1.69 djm 1761: int r = SSH_ERR_INTERNAL_ERROR;
1762: #ifdef WITH_OPENSSL
1763: const BIGNUM *rsa_n, *rsa_e;
1764: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1765: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1766: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1767: BIGNUM *dsa_pub_key_dup = NULL;
1768: #endif /* WITH_OPENSSL */
1.1 djm 1769:
1.24 djm 1770: *pkp = NULL;
1.85 djm 1771: if ((n = sshkey_new(k->type)) == NULL) {
1772: r = SSH_ERR_ALLOC_FAIL;
1773: goto out;
1774: }
1.1 djm 1775: switch (k->type) {
1776: #ifdef WITH_OPENSSL
1777: case KEY_DSA:
1778: case KEY_DSA_CERT:
1.69 djm 1779: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1780: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1781: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1782: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1783: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1784: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1785: r = SSH_ERR_ALLOC_FAIL;
1786: goto out;
1787: }
1788: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1789: r = SSH_ERR_LIBCRYPTO_ERROR;
1790: goto out;
1.1 djm 1791: }
1.69 djm 1792: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1793: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1794: r = SSH_ERR_LIBCRYPTO_ERROR;
1795: goto out;
1796: }
1797: dsa_pub_key_dup = NULL; /* transferred */
1798:
1.1 djm 1799: break;
1800: case KEY_ECDSA:
1801: case KEY_ECDSA_CERT:
1.85 djm 1802: case KEY_ECDSA_SK:
1803: case KEY_ECDSA_SK_CERT:
1.1 djm 1804: n->ecdsa_nid = k->ecdsa_nid;
1805: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1806: if (n->ecdsa == NULL) {
1.69 djm 1807: r = SSH_ERR_ALLOC_FAIL;
1808: goto out;
1.1 djm 1809: }
1810: if (EC_KEY_set_public_key(n->ecdsa,
1811: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1812: r = SSH_ERR_LIBCRYPTO_ERROR;
1813: goto out;
1.1 djm 1814: }
1.85 djm 1815: if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT)
1816: break;
1817: /* Append security-key application string */
1818: if ((n->sk_application = strdup(k->sk_application)) == NULL)
1819: goto out;
1.1 djm 1820: break;
1821: case KEY_RSA:
1822: case KEY_RSA_CERT:
1.69 djm 1823: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1824: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1825: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1826: r = SSH_ERR_ALLOC_FAIL;
1827: goto out;
1828: }
1829: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1830: r = SSH_ERR_LIBCRYPTO_ERROR;
1831: goto out;
1832: }
1833: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1834: break;
1835: #endif /* WITH_OPENSSL */
1836: case KEY_ED25519:
1837: case KEY_ED25519_CERT:
1838: if (k->ed25519_pk != NULL) {
1839: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1840: r = SSH_ERR_ALLOC_FAIL;
1841: goto out;
1.1 djm 1842: }
1843: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1844: }
1845: break;
1.62 markus 1846: #ifdef WITH_XMSS
1847: case KEY_XMSS:
1848: case KEY_XMSS_CERT:
1.69 djm 1849: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1850: goto out;
1.62 markus 1851: if (k->xmss_pk != NULL) {
1852: size_t pklen = sshkey_xmss_pklen(k);
1853: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1854: r = SSH_ERR_INTERNAL_ERROR;
1855: goto out;
1.62 markus 1856: }
1857: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1858: r = SSH_ERR_ALLOC_FAIL;
1859: goto out;
1.62 markus 1860: }
1861: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1862: }
1863: break;
1864: #endif /* WITH_XMSS */
1.1 djm 1865: default:
1.69 djm 1866: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1867: goto out;
1.1 djm 1868: }
1.69 djm 1869: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1870: goto out;
1871: /* success */
1.1 djm 1872: *pkp = n;
1.69 djm 1873: n = NULL;
1874: r = 0;
1875: out:
1876: sshkey_free(n);
1.83 djm 1877: #ifdef WITH_OPENSSL
1.69 djm 1878: BN_clear_free(rsa_n_dup);
1879: BN_clear_free(rsa_e_dup);
1880: BN_clear_free(dsa_p_dup);
1881: BN_clear_free(dsa_q_dup);
1882: BN_clear_free(dsa_g_dup);
1883: BN_clear_free(dsa_pub_key_dup);
1.83 djm 1884: #endif /* WITH_OPENSSL */
1.69 djm 1885:
1886: return r;
1.1 djm 1887: }
1888:
1.76 djm 1889: int
1890: sshkey_is_shielded(struct sshkey *k)
1891: {
1892: return k != NULL && k->shielded_private != NULL;
1893: }
1894:
1895: int
1896: sshkey_shield_private(struct sshkey *k)
1897: {
1898: struct sshbuf *prvbuf = NULL;
1899: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1900: struct sshcipher_ctx *cctx = NULL;
1901: const struct sshcipher *cipher;
1902: size_t i, enclen = 0;
1903: struct sshkey *kswap = NULL, tmp;
1904: int r = SSH_ERR_INTERNAL_ERROR;
1905:
1906: #ifdef DEBUG_PK
1907: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1908: #endif
1909: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1910: r = SSH_ERR_INVALID_ARGUMENT;
1911: goto out;
1912: }
1913: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1914: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1915: r = SSH_ERR_INTERNAL_ERROR;
1916: goto out;
1917: }
1918:
1919: /* Prepare a random pre-key, and from it an ephemeral key */
1920: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1921: r = SSH_ERR_ALLOC_FAIL;
1922: goto out;
1923: }
1924: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1925: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1926: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1927: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1928: goto out;
1929: #ifdef DEBUG_PK
1930: fprintf(stderr, "%s: key+iv\n", __func__);
1931: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1932: stderr);
1933: #endif
1934: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1935: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1936: goto out;
1937:
1938: /* Serialise and encrypt the private key using the ephemeral key */
1939: if ((prvbuf = sshbuf_new()) == NULL) {
1940: r = SSH_ERR_ALLOC_FAIL;
1941: goto out;
1942: }
1943: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1944: goto out;
1945: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1946: SSHKEY_SERIALIZE_FULL)) != 0)
1947: goto out;
1948: /* pad to cipher blocksize */
1949: i = 0;
1950: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1951: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1952: goto out;
1953: }
1954: #ifdef DEBUG_PK
1955: fprintf(stderr, "%s: serialised\n", __func__);
1956: sshbuf_dump(prvbuf, stderr);
1957: #endif
1958: /* encrypt */
1959: enclen = sshbuf_len(prvbuf);
1960: if ((enc = malloc(enclen)) == NULL) {
1961: r = SSH_ERR_ALLOC_FAIL;
1962: goto out;
1963: }
1964: if ((r = cipher_crypt(cctx, 0, enc,
1965: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1966: goto out;
1967: #ifdef DEBUG_PK
1968: fprintf(stderr, "%s: encrypted\n", __func__);
1969: sshbuf_dump_data(enc, enclen, stderr);
1970: #endif
1971:
1972: /* Make a scrubbed, public-only copy of our private key argument */
1973: if ((r = sshkey_from_private(k, &kswap)) != 0)
1974: goto out;
1975:
1976: /* Swap the private key out (it will be destroyed below) */
1977: tmp = *kswap;
1978: *kswap = *k;
1979: *k = tmp;
1980:
1981: /* Insert the shielded key into our argument */
1982: k->shielded_private = enc;
1983: k->shielded_len = enclen;
1984: k->shield_prekey = prekey;
1985: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1986: enc = prekey = NULL; /* transferred */
1987: enclen = 0;
1988:
1989: /* success */
1990: r = 0;
1991:
1992: out:
1993: /* XXX behaviour on error - invalidate original private key? */
1994: cipher_free(cctx);
1995: explicit_bzero(keyiv, sizeof(keyiv));
1996: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1997: freezero(enc, enclen);
1.76 djm 1998: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1999: sshkey_free(kswap);
2000: sshbuf_free(prvbuf);
2001: return r;
2002: }
2003:
2004: int
2005: sshkey_unshield_private(struct sshkey *k)
2006: {
2007: struct sshbuf *prvbuf = NULL;
2008: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
2009: struct sshcipher_ctx *cctx = NULL;
2010: const struct sshcipher *cipher;
2011: size_t i;
2012: struct sshkey *kswap = NULL, tmp;
2013: int r = SSH_ERR_INTERNAL_ERROR;
2014:
2015: #ifdef DEBUG_PK
2016: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
2017: #endif
2018: if (!sshkey_is_shielded(k))
2019: return 0; /* nothing to do */
2020:
2021: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
2022: r = SSH_ERR_INVALID_ARGUMENT;
2023: goto out;
2024: }
2025: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
2026: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
2027: r = SSH_ERR_INTERNAL_ERROR;
2028: goto out;
2029: }
2030: /* check size of shielded key blob */
2031: if (k->shielded_len < cipher_blocksize(cipher) ||
2032: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
2033: r = SSH_ERR_INVALID_FORMAT;
2034: goto out;
2035: }
2036:
2037: /* Calculate the ephemeral key from the prekey */
2038: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
2039: k->shield_prekey, k->shield_prekey_len,
2040: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
2041: goto out;
2042: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
2043: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
2044: goto out;
2045: #ifdef DEBUG_PK
2046: fprintf(stderr, "%s: key+iv\n", __func__);
2047: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
2048: stderr);
2049: #endif
2050:
2051: /* Decrypt and parse the shielded private key using the ephemeral key */
2052: if ((prvbuf = sshbuf_new()) == NULL) {
2053: r = SSH_ERR_ALLOC_FAIL;
2054: goto out;
2055: }
2056: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2057: goto out;
2058: /* decrypt */
2059: #ifdef DEBUG_PK
2060: fprintf(stderr, "%s: encrypted\n", __func__);
2061: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2062: #endif
2063: if ((r = cipher_crypt(cctx, 0, cp,
2064: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2065: goto out;
2066: #ifdef DEBUG_PK
2067: fprintf(stderr, "%s: serialised\n", __func__);
2068: sshbuf_dump(prvbuf, stderr);
2069: #endif
2070: /* Parse private key */
2071: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2072: goto out;
2073: /* Check deterministic padding */
2074: i = 0;
2075: while (sshbuf_len(prvbuf)) {
2076: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2077: goto out;
2078: if (pad != (++i & 0xff)) {
2079: r = SSH_ERR_INVALID_FORMAT;
2080: goto out;
2081: }
2082: }
2083:
2084: /* Swap the parsed key back into place */
2085: tmp = *kswap;
2086: *kswap = *k;
2087: *k = tmp;
2088:
2089: /* success */
2090: r = 0;
2091:
2092: out:
2093: cipher_free(cctx);
2094: explicit_bzero(keyiv, sizeof(keyiv));
2095: explicit_bzero(&tmp, sizeof(tmp));
2096: sshkey_free(kswap);
2097: sshbuf_free(prvbuf);
2098: return r;
2099: }
2100:
1.1 djm 2101: static int
1.14 djm 2102: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2103: {
1.14 djm 2104: struct sshbuf *principals = NULL, *crit = NULL;
2105: struct sshbuf *exts = NULL, *ca = NULL;
2106: u_char *sig = NULL;
2107: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2108: int ret = SSH_ERR_INTERNAL_ERROR;
2109:
2110: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2111: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2112: return ret;
2113:
1.20 djm 2114: /* Parse body of certificate up to signature */
2115: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2116: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2117: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2118: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2119: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2120: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2121: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2122: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2123: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2124: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2125: /* XXX debug print error for ret */
2126: ret = SSH_ERR_INVALID_FORMAT;
2127: goto out;
2128: }
2129:
2130: /* Signature is left in the buffer so we can calculate this length */
2131: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2132:
2133: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2134: ret = SSH_ERR_INVALID_FORMAT;
2135: goto out;
2136: }
2137:
2138: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2139: key->cert->type != SSH2_CERT_TYPE_HOST) {
2140: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2141: goto out;
2142: }
2143:
1.4 djm 2144: /* Parse principals section */
2145: while (sshbuf_len(principals) > 0) {
2146: char *principal = NULL;
2147: char **oprincipals = NULL;
2148:
1.1 djm 2149: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2150: ret = SSH_ERR_INVALID_FORMAT;
2151: goto out;
2152: }
1.4 djm 2153: if ((ret = sshbuf_get_cstring(principals, &principal,
2154: NULL)) != 0) {
1.1 djm 2155: ret = SSH_ERR_INVALID_FORMAT;
2156: goto out;
2157: }
2158: oprincipals = key->cert->principals;
1.51 deraadt 2159: key->cert->principals = recallocarray(key->cert->principals,
2160: key->cert->nprincipals, key->cert->nprincipals + 1,
2161: sizeof(*key->cert->principals));
1.1 djm 2162: if (key->cert->principals == NULL) {
2163: free(principal);
2164: key->cert->principals = oprincipals;
2165: ret = SSH_ERR_ALLOC_FAIL;
2166: goto out;
2167: }
2168: key->cert->principals[key->cert->nprincipals++] = principal;
2169: }
2170:
1.4 djm 2171: /*
2172: * Stash a copies of the critical options and extensions sections
2173: * for later use.
2174: */
2175: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2176: (exts != NULL &&
2177: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2178: goto out;
2179:
1.4 djm 2180: /*
2181: * Validate critical options and extensions sections format.
2182: */
2183: while (sshbuf_len(crit) != 0) {
2184: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2185: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2186: sshbuf_reset(key->cert->critical);
1.1 djm 2187: ret = SSH_ERR_INVALID_FORMAT;
2188: goto out;
2189: }
2190: }
1.4 djm 2191: while (exts != NULL && sshbuf_len(exts) != 0) {
2192: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2193: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2194: sshbuf_reset(key->cert->extensions);
1.1 djm 2195: ret = SSH_ERR_INVALID_FORMAT;
2196: goto out;
2197: }
2198: }
2199:
1.4 djm 2200: /* Parse CA key and check signature */
1.14 djm 2201: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2202: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2203: goto out;
2204: }
2205: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2206: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2207: goto out;
2208: }
2209: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 2210: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 2211: goto out;
1.82 djm 2212: if ((ret = sshkey_get_sigtype(sig, slen,
2213: &key->cert->signature_type)) != 0)
1.67 djm 2214: goto out;
1.4 djm 2215:
2216: /* Success */
1.1 djm 2217: ret = 0;
2218: out:
1.14 djm 2219: sshbuf_free(ca);
1.4 djm 2220: sshbuf_free(crit);
2221: sshbuf_free(exts);
2222: sshbuf_free(principals);
1.1 djm 2223: free(sig);
2224: return ret;
2225: }
2226:
1.83 djm 2227: #ifdef WITH_OPENSSL
1.1 djm 2228: static int
1.69 djm 2229: check_rsa_length(const RSA *rsa)
2230: {
2231: const BIGNUM *rsa_n;
2232:
2233: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2234: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2235: return SSH_ERR_KEY_LENGTH;
2236: return 0;
2237: }
1.83 djm 2238: #endif /* WITH_OPENSSL */
1.69 djm 2239:
2240: static int
1.14 djm 2241: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2242: int allow_cert)
1.1 djm 2243: {
1.12 djm 2244: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2245: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2246: struct sshkey *key = NULL;
2247: size_t len;
2248: u_char *pk = NULL;
1.14 djm 2249: struct sshbuf *copy;
1.1 djm 2250: #ifdef WITH_OPENSSL
2251: EC_POINT *q = NULL;
1.69 djm 2252: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2253: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2254: #endif /* WITH_OPENSSL */
2255:
2256: #ifdef DEBUG_PK /* XXX */
1.14 djm 2257: sshbuf_dump(b, stderr);
1.1 djm 2258: #endif
1.32 djm 2259: if (keyp != NULL)
2260: *keyp = NULL;
1.14 djm 2261: if ((copy = sshbuf_fromb(b)) == NULL) {
2262: ret = SSH_ERR_ALLOC_FAIL;
2263: goto out;
2264: }
1.1 djm 2265: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2266: ret = SSH_ERR_INVALID_FORMAT;
2267: goto out;
2268: }
2269:
2270: type = sshkey_type_from_name(ktype);
2271: if (!allow_cert && sshkey_type_is_cert(type)) {
2272: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2273: goto out;
2274: }
2275: switch (type) {
2276: #ifdef WITH_OPENSSL
2277: case KEY_RSA_CERT:
1.14 djm 2278: /* Skip nonce */
1.1 djm 2279: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2280: ret = SSH_ERR_INVALID_FORMAT;
2281: goto out;
2282: }
2283: /* FALLTHROUGH */
2284: case KEY_RSA:
2285: if ((key = sshkey_new(type)) == NULL) {
2286: ret = SSH_ERR_ALLOC_FAIL;
2287: goto out;
2288: }
1.73 djm 2289: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2290: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2291: ret = SSH_ERR_INVALID_FORMAT;
2292: goto out;
2293: }
1.69 djm 2294: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2295: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2296: goto out;
2297: }
1.69 djm 2298: rsa_n = rsa_e = NULL; /* transferred */
2299: if ((ret = check_rsa_length(key->rsa)) != 0)
2300: goto out;
1.1 djm 2301: #ifdef DEBUG_PK
2302: RSA_print_fp(stderr, key->rsa, 8);
2303: #endif
2304: break;
2305: case KEY_DSA_CERT:
1.14 djm 2306: /* Skip nonce */
1.1 djm 2307: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2308: ret = SSH_ERR_INVALID_FORMAT;
2309: goto out;
2310: }
2311: /* FALLTHROUGH */
2312: case KEY_DSA:
2313: if ((key = sshkey_new(type)) == NULL) {
2314: ret = SSH_ERR_ALLOC_FAIL;
2315: goto out;
2316: }
1.73 djm 2317: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2318: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2319: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2320: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2321: ret = SSH_ERR_INVALID_FORMAT;
2322: goto out;
2323: }
1.69 djm 2324: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2325: ret = SSH_ERR_LIBCRYPTO_ERROR;
2326: goto out;
2327: }
2328: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2329: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2330: ret = SSH_ERR_LIBCRYPTO_ERROR;
2331: goto out;
2332: }
2333: dsa_pub_key = NULL; /* transferred */
1.1 djm 2334: #ifdef DEBUG_PK
2335: DSA_print_fp(stderr, key->dsa, 8);
2336: #endif
2337: break;
2338: case KEY_ECDSA_CERT:
1.85 djm 2339: case KEY_ECDSA_SK_CERT:
1.14 djm 2340: /* Skip nonce */
1.1 djm 2341: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2342: ret = SSH_ERR_INVALID_FORMAT;
2343: goto out;
2344: }
2345: /* FALLTHROUGH */
2346: case KEY_ECDSA:
1.85 djm 2347: case KEY_ECDSA_SK:
1.1 djm 2348: if ((key = sshkey_new(type)) == NULL) {
2349: ret = SSH_ERR_ALLOC_FAIL;
2350: goto out;
2351: }
1.12 djm 2352: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2353: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2354: ret = SSH_ERR_INVALID_FORMAT;
2355: goto out;
2356: }
2357: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2358: ret = SSH_ERR_EC_CURVE_MISMATCH;
2359: goto out;
2360: }
1.60 jsing 2361: EC_KEY_free(key->ecdsa);
1.1 djm 2362: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2363: == NULL) {
2364: ret = SSH_ERR_EC_CURVE_INVALID;
2365: goto out;
2366: }
2367: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2368: ret = SSH_ERR_ALLOC_FAIL;
2369: goto out;
2370: }
2371: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2372: ret = SSH_ERR_INVALID_FORMAT;
2373: goto out;
2374: }
2375: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2376: q) != 0) {
2377: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2378: goto out;
2379: }
2380: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2381: /* XXX assume it is a allocation error */
2382: ret = SSH_ERR_ALLOC_FAIL;
2383: goto out;
2384: }
2385: #ifdef DEBUG_PK
2386: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2387: #endif
1.85 djm 2388: if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) {
2389: /* Parse additional security-key application string */
2390: if (sshbuf_get_cstring(b, &key->sk_application,
2391: NULL) != 0) {
2392: ret = SSH_ERR_INVALID_FORMAT;
2393: goto out;
2394: }
2395: #ifdef DEBUG_PK
2396: fprintf(stderr, "App: %s\n", key->sk_application);
2397: #endif
2398: }
1.1 djm 2399: break;
2400: #endif /* WITH_OPENSSL */
2401: case KEY_ED25519_CERT:
1.14 djm 2402: /* Skip nonce */
1.1 djm 2403: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2404: ret = SSH_ERR_INVALID_FORMAT;
2405: goto out;
2406: }
2407: /* FALLTHROUGH */
2408: case KEY_ED25519:
2409: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2410: goto out;
2411: if (len != ED25519_PK_SZ) {
2412: ret = SSH_ERR_INVALID_FORMAT;
2413: goto out;
2414: }
2415: if ((key = sshkey_new(type)) == NULL) {
2416: ret = SSH_ERR_ALLOC_FAIL;
2417: goto out;
2418: }
2419: key->ed25519_pk = pk;
2420: pk = NULL;
2421: break;
1.62 markus 2422: #ifdef WITH_XMSS
2423: case KEY_XMSS_CERT:
2424: /* Skip nonce */
2425: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2426: ret = SSH_ERR_INVALID_FORMAT;
2427: goto out;
2428: }
2429: /* FALLTHROUGH */
2430: case KEY_XMSS:
2431: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2432: goto out;
2433: if ((key = sshkey_new(type)) == NULL) {
2434: ret = SSH_ERR_ALLOC_FAIL;
2435: goto out;
2436: }
2437: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2438: goto out;
2439: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2440: goto out;
2441: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2442: ret = SSH_ERR_INVALID_FORMAT;
2443: goto out;
2444: }
2445: key->xmss_pk = pk;
2446: pk = NULL;
2447: if (type != KEY_XMSS_CERT &&
2448: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2449: goto out;
2450: break;
2451: #endif /* WITH_XMSS */
1.1 djm 2452: case KEY_UNSPEC:
2453: default:
2454: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2455: goto out;
2456: }
2457:
2458: /* Parse certificate potion */
1.14 djm 2459: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2460: goto out;
2461:
2462: if (key != NULL && sshbuf_len(b) != 0) {
2463: ret = SSH_ERR_INVALID_FORMAT;
2464: goto out;
2465: }
2466: ret = 0;
1.32 djm 2467: if (keyp != NULL) {
2468: *keyp = key;
2469: key = NULL;
2470: }
1.1 djm 2471: out:
1.14 djm 2472: sshbuf_free(copy);
1.1 djm 2473: sshkey_free(key);
1.62 markus 2474: free(xmss_name);
1.1 djm 2475: free(ktype);
2476: free(curve);
2477: free(pk);
2478: #ifdef WITH_OPENSSL
1.60 jsing 2479: EC_POINT_free(q);
1.69 djm 2480: BN_clear_free(rsa_n);
2481: BN_clear_free(rsa_e);
2482: BN_clear_free(dsa_p);
2483: BN_clear_free(dsa_q);
2484: BN_clear_free(dsa_g);
2485: BN_clear_free(dsa_pub_key);
1.1 djm 2486: #endif /* WITH_OPENSSL */
2487: return ret;
2488: }
2489:
2490: int
2491: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2492: {
1.14 djm 2493: struct sshbuf *b;
2494: int r;
2495:
2496: if ((b = sshbuf_from(blob, blen)) == NULL)
2497: return SSH_ERR_ALLOC_FAIL;
2498: r = sshkey_from_blob_internal(b, keyp, 1);
2499: sshbuf_free(b);
2500: return r;
2501: }
2502:
2503: int
2504: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2505: {
2506: return sshkey_from_blob_internal(b, keyp, 1);
2507: }
2508:
2509: int
2510: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2511: {
2512: struct sshbuf *b;
2513: int r;
2514:
2515: if ((r = sshbuf_froms(buf, &b)) != 0)
2516: return r;
2517: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2518: sshbuf_free(b);
2519: return r;
2520: }
2521:
1.82 djm 2522: int
2523: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2524: {
2525: int r;
2526: struct sshbuf *b = NULL;
2527: char *sigtype = NULL;
2528:
2529: if (sigtypep != NULL)
2530: *sigtypep = NULL;
2531: if ((b = sshbuf_from(sig, siglen)) == NULL)
2532: return SSH_ERR_ALLOC_FAIL;
2533: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2534: goto out;
2535: /* success */
2536: if (sigtypep != NULL) {
2537: *sigtypep = sigtype;
2538: sigtype = NULL;
2539: }
2540: r = 0;
2541: out:
2542: free(sigtype);
1.14 djm 2543: sshbuf_free(b);
2544: return r;
1.68 djm 2545: }
2546:
2547: /*
2548: *
2549: * Checks whether a certificate's signature type is allowed.
2550: * Returns 0 (success) if the certificate signature type appears in the
2551: * "allowed" pattern-list, or the key is not a certificate to begin with.
2552: * Otherwise returns a ssherr.h code.
2553: */
2554: int
2555: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2556: {
2557: if (key == NULL || allowed == NULL)
2558: return SSH_ERR_INVALID_ARGUMENT;
2559: if (!sshkey_type_is_cert(key->type))
2560: return 0;
2561: if (key->cert == NULL || key->cert->signature_type == NULL)
2562: return SSH_ERR_INVALID_ARGUMENT;
2563: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2564: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2565: return 0;
1.65 djm 2566: }
2567:
2568: /*
2569: * Returns the expected signature algorithm for a given public key algorithm.
2570: */
1.66 djm 2571: const char *
2572: sshkey_sigalg_by_name(const char *name)
1.65 djm 2573: {
2574: const struct keytype *kt;
2575:
2576: for (kt = keytypes; kt->type != -1; kt++) {
2577: if (strcmp(kt->name, name) != 0)
2578: continue;
2579: if (kt->sigalg != NULL)
2580: return kt->sigalg;
2581: if (!kt->cert)
2582: return kt->name;
2583: return sshkey_ssh_name_from_type_nid(
2584: sshkey_type_plain(kt->type), kt->nid);
2585: }
2586: return NULL;
2587: }
2588:
2589: /*
2590: * Verifies that the signature algorithm appearing inside the signature blob
2591: * matches that which was requested.
2592: */
2593: int
2594: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2595: const char *requested_alg)
2596: {
2597: const char *expected_alg;
2598: char *sigtype = NULL;
2599: int r;
2600:
2601: if (requested_alg == NULL)
2602: return 0;
1.66 djm 2603: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2604: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2605: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2606: return r;
2607: r = strcmp(expected_alg, sigtype) == 0;
2608: free(sigtype);
2609: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2610: }
2611:
2612: int
1.76 djm 2613: sshkey_sign(struct sshkey *key,
1.1 djm 2614: u_char **sigp, size_t *lenp,
1.86 djm 2615: const u_char *data, size_t datalen,
2616: const char *alg, const char *sk_provider, u_int compat)
1.1 djm 2617: {
1.76 djm 2618: int was_shielded = sshkey_is_shielded(key);
2619: int r2, r = SSH_ERR_INTERNAL_ERROR;
2620:
1.1 djm 2621: if (sigp != NULL)
2622: *sigp = NULL;
2623: if (lenp != NULL)
2624: *lenp = 0;
2625: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2626: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2627: if ((r = sshkey_unshield_private(key)) != 0)
2628: return r;
1.1 djm 2629: switch (key->type) {
2630: #ifdef WITH_OPENSSL
2631: case KEY_DSA_CERT:
2632: case KEY_DSA:
1.76 djm 2633: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2634: break;
1.1 djm 2635: case KEY_ECDSA_CERT:
2636: case KEY_ECDSA:
1.76 djm 2637: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2638: break;
1.86 djm 2639: case KEY_ECDSA_SK_CERT:
2640: case KEY_ECDSA_SK:
1.88 markus 2641: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
2642: compat);
1.86 djm 2643: break;
1.1 djm 2644: case KEY_RSA_CERT:
2645: case KEY_RSA:
1.76 djm 2646: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2647: break;
1.1 djm 2648: #endif /* WITH_OPENSSL */
2649: case KEY_ED25519:
2650: case KEY_ED25519_CERT:
1.76 djm 2651: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.89 ! markus 2652: break;
! 2653: case KEY_ED25519_SK:
! 2654: case KEY_ED25519_SK_CERT:
! 2655: r = sshsk_sign(sk_provider, key, sigp, lenp, data, datalen,
! 2656: compat);
1.76 djm 2657: break;
1.62 markus 2658: #ifdef WITH_XMSS
2659: case KEY_XMSS:
2660: case KEY_XMSS_CERT:
1.76 djm 2661: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2662: break;
1.62 markus 2663: #endif /* WITH_XMSS */
1.1 djm 2664: default:
1.76 djm 2665: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2666: break;
1.1 djm 2667: }
1.76 djm 2668: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2669: return r2;
2670: return r;
1.1 djm 2671: }
2672:
2673: /*
2674: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2675: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2676: */
2677: int
2678: sshkey_verify(const struct sshkey *key,
2679: const u_char *sig, size_t siglen,
1.59 djm 2680: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2681: {
1.6 djm 2682: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2683: return SSH_ERR_INVALID_ARGUMENT;
2684: switch (key->type) {
2685: #ifdef WITH_OPENSSL
2686: case KEY_DSA_CERT:
2687: case KEY_DSA:
2688: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2689: case KEY_ECDSA_CERT:
2690: case KEY_ECDSA:
2691: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
1.85 djm 2692: case KEY_ECDSA_SK_CERT:
2693: case KEY_ECDSA_SK:
2694: return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen,
2695: compat);
1.1 djm 2696: case KEY_RSA_CERT:
2697: case KEY_RSA:
1.59 djm 2698: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2699: #endif /* WITH_OPENSSL */
2700: case KEY_ED25519:
2701: case KEY_ED25519_CERT:
2702: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.87 markus 2703: case KEY_ED25519_SK:
2704: case KEY_ED25519_SK_CERT:
2705: return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen,
2706: compat);
1.62 markus 2707: #ifdef WITH_XMSS
2708: case KEY_XMSS:
2709: case KEY_XMSS_CERT:
2710: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2711: #endif /* WITH_XMSS */
1.1 djm 2712: default:
2713: return SSH_ERR_KEY_TYPE_UNKNOWN;
2714: }
2715: }
2716:
2717: /* Convert a plain key to their _CERT equivalent */
2718: int
1.20 djm 2719: sshkey_to_certified(struct sshkey *k)
1.1 djm 2720: {
2721: int newtype;
2722:
2723: switch (k->type) {
2724: #ifdef WITH_OPENSSL
2725: case KEY_RSA:
1.20 djm 2726: newtype = KEY_RSA_CERT;
1.1 djm 2727: break;
2728: case KEY_DSA:
1.20 djm 2729: newtype = KEY_DSA_CERT;
1.1 djm 2730: break;
2731: case KEY_ECDSA:
2732: newtype = KEY_ECDSA_CERT;
2733: break;
1.85 djm 2734: case KEY_ECDSA_SK:
2735: newtype = KEY_ECDSA_SK_CERT;
2736: break;
1.1 djm 2737: #endif /* WITH_OPENSSL */
2738: case KEY_ED25519:
2739: newtype = KEY_ED25519_CERT;
2740: break;
1.62 markus 2741: #ifdef WITH_XMSS
2742: case KEY_XMSS:
2743: newtype = KEY_XMSS_CERT;
2744: break;
2745: #endif /* WITH_XMSS */
1.1 djm 2746: default:
2747: return SSH_ERR_INVALID_ARGUMENT;
2748: }
2749: if ((k->cert = cert_new()) == NULL)
2750: return SSH_ERR_ALLOC_FAIL;
2751: k->type = newtype;
2752: return 0;
2753: }
2754:
2755: /* Convert a certificate to its raw key equivalent */
2756: int
2757: sshkey_drop_cert(struct sshkey *k)
2758: {
2759: if (!sshkey_type_is_cert(k->type))
2760: return SSH_ERR_KEY_TYPE_UNKNOWN;
2761: cert_free(k->cert);
2762: k->cert = NULL;
2763: k->type = sshkey_type_plain(k->type);
2764: return 0;
2765: }
2766:
2767: /* Sign a certified key, (re-)generating the signed certblob. */
2768: int
1.53 djm 2769: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
1.86 djm 2770: const char *sk_provider, sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2771: {
2772: struct sshbuf *principals = NULL;
2773: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2774: size_t i, ca_len, sig_len;
2775: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2776: struct sshbuf *cert = NULL;
2777: char *sigtype = NULL;
1.69 djm 2778: #ifdef WITH_OPENSSL
2779: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2780: #endif /* WITH_OPENSSL */
1.1 djm 2781:
2782: if (k == NULL || k->cert == NULL ||
2783: k->cert->certblob == NULL || ca == NULL)
2784: return SSH_ERR_INVALID_ARGUMENT;
2785: if (!sshkey_is_cert(k))
2786: return SSH_ERR_KEY_TYPE_UNKNOWN;
2787: if (!sshkey_type_is_valid_ca(ca->type))
2788: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2789:
1.67 djm 2790: /*
2791: * If no alg specified as argument but a signature_type was set,
2792: * then prefer that. If both were specified, then they must match.
2793: */
2794: if (alg == NULL)
2795: alg = k->cert->signature_type;
2796: else if (k->cert->signature_type != NULL &&
2797: strcmp(alg, k->cert->signature_type) != 0)
2798: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2799:
2800: /*
2801: * If no signing algorithm or signature_type was specified and we're
2802: * using a RSA key, then default to a good signature algorithm.
2803: */
2804: if (alg == NULL && ca->type == KEY_RSA)
2805: alg = "rsa-sha2-512";
1.67 djm 2806:
1.1 djm 2807: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2808: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2809:
2810: cert = k->cert->certblob; /* for readability */
2811: sshbuf_reset(cert);
2812: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2813: goto out;
2814:
2815: /* -v01 certs put nonce first */
2816: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2817: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2818: goto out;
1.1 djm 2819:
2820: /* XXX this substantially duplicates to_blob(); refactor */
2821: switch (k->type) {
2822: #ifdef WITH_OPENSSL
2823: case KEY_DSA_CERT:
1.69 djm 2824: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2825: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2826: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2827: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2828: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2829: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2830: goto out;
2831: break;
2832: case KEY_ECDSA_CERT:
1.85 djm 2833: case KEY_ECDSA_SK_CERT:
1.1 djm 2834: if ((ret = sshbuf_put_cstring(cert,
2835: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2836: (ret = sshbuf_put_ec(cert,
2837: EC_KEY_get0_public_key(k->ecdsa),
2838: EC_KEY_get0_group(k->ecdsa))) != 0)
2839: goto out;
1.85 djm 2840: if (k->type == KEY_ECDSA_SK_CERT) {
2841: if ((ret = sshbuf_put_cstring(cert,
2842: k->sk_application)) != 0)
2843: goto out;
2844: }
1.1 djm 2845: break;
2846: case KEY_RSA_CERT:
1.69 djm 2847: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2848: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2849: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2850: goto out;
2851: break;
2852: #endif /* WITH_OPENSSL */
2853: case KEY_ED25519_CERT:
2854: if ((ret = sshbuf_put_string(cert,
2855: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2856: goto out;
2857: break;
1.62 markus 2858: #ifdef WITH_XMSS
2859: case KEY_XMSS_CERT:
2860: if (k->xmss_name == NULL) {
2861: ret = SSH_ERR_INVALID_ARGUMENT;
2862: goto out;
2863: }
2864: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2865: (ret = sshbuf_put_string(cert,
2866: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2867: goto out;
2868: break;
2869: #endif /* WITH_XMSS */
1.1 djm 2870: default:
2871: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2872: goto out;
1.1 djm 2873: }
2874:
1.20 djm 2875: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2876: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2877: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2878: goto out;
2879:
2880: if ((principals = sshbuf_new()) == NULL) {
2881: ret = SSH_ERR_ALLOC_FAIL;
2882: goto out;
2883: }
2884: for (i = 0; i < k->cert->nprincipals; i++) {
2885: if ((ret = sshbuf_put_cstring(principals,
2886: k->cert->principals[i])) != 0)
2887: goto out;
2888: }
2889: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2890: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2891: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2892: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2893: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2894: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2895: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2896: goto out;
2897:
2898: /* Sign the whole mess */
1.53 djm 2899: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
1.86 djm 2900: sshbuf_len(cert), alg, sk_provider, 0, signer_ctx)) != 0)
1.1 djm 2901: goto out;
1.67 djm 2902: /* Check and update signature_type against what was actually used */
1.82 djm 2903: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2904: goto out;
2905: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2906: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2907: goto out;
2908: }
2909: if (k->cert->signature_type == NULL) {
2910: k->cert->signature_type = sigtype;
2911: sigtype = NULL;
2912: }
1.1 djm 2913: /* Append signature and we are done */
2914: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2915: goto out;
2916: ret = 0;
2917: out:
2918: if (ret != 0)
2919: sshbuf_reset(cert);
1.29 mmcc 2920: free(sig_blob);
2921: free(ca_blob);
1.67 djm 2922: free(sigtype);
1.31 mmcc 2923: sshbuf_free(principals);
1.1 djm 2924: return ret;
1.53 djm 2925: }
2926:
2927: static int
1.76 djm 2928: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2929: const u_char *data, size_t datalen,
1.86 djm 2930: const char *alg, const char *sk_provider, u_int compat, void *ctx)
1.53 djm 2931: {
2932: if (ctx != NULL)
2933: return SSH_ERR_INVALID_ARGUMENT;
1.86 djm 2934: return sshkey_sign(key, sigp, lenp, data, datalen, alg,
2935: sk_provider, compat);
1.53 djm 2936: }
2937:
2938: int
1.86 djm 2939: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
2940: const char *sk_provider)
1.53 djm 2941: {
1.86 djm 2942: return sshkey_certify_custom(k, ca, alg, sk_provider,
2943: default_key_sign, NULL);
1.1 djm 2944: }
2945:
2946: int
2947: sshkey_cert_check_authority(const struct sshkey *k,
2948: int want_host, int require_principal,
2949: const char *name, const char **reason)
2950: {
2951: u_int i, principal_matches;
2952: time_t now = time(NULL);
2953:
2954: if (reason != NULL)
2955: *reason = NULL;
2956:
2957: if (want_host) {
2958: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2959: *reason = "Certificate invalid: not a host certificate";
2960: return SSH_ERR_KEY_CERT_INVALID;
2961: }
2962: } else {
2963: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2964: *reason = "Certificate invalid: not a user certificate";
2965: return SSH_ERR_KEY_CERT_INVALID;
2966: }
2967: }
2968: if (now < 0) {
2969: /* yikes - system clock before epoch! */
2970: *reason = "Certificate invalid: not yet valid";
2971: return SSH_ERR_KEY_CERT_INVALID;
2972: }
2973: if ((u_int64_t)now < k->cert->valid_after) {
2974: *reason = "Certificate invalid: not yet valid";
2975: return SSH_ERR_KEY_CERT_INVALID;
2976: }
2977: if ((u_int64_t)now >= k->cert->valid_before) {
2978: *reason = "Certificate invalid: expired";
2979: return SSH_ERR_KEY_CERT_INVALID;
2980: }
2981: if (k->cert->nprincipals == 0) {
2982: if (require_principal) {
2983: *reason = "Certificate lacks principal list";
2984: return SSH_ERR_KEY_CERT_INVALID;
2985: }
2986: } else if (name != NULL) {
2987: principal_matches = 0;
2988: for (i = 0; i < k->cert->nprincipals; i++) {
2989: if (strcmp(name, k->cert->principals[i]) == 0) {
2990: principal_matches = 1;
2991: break;
2992: }
2993: }
2994: if (!principal_matches) {
2995: *reason = "Certificate invalid: name is not a listed "
2996: "principal";
2997: return SSH_ERR_KEY_CERT_INVALID;
2998: }
2999: }
3000: return 0;
1.27 djm 3001: }
3002:
3003: size_t
3004: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
3005: {
3006: char from[32], to[32], ret[64];
3007: time_t tt;
3008: struct tm *tm;
3009:
3010: *from = *to = '\0';
3011: if (cert->valid_after == 0 &&
3012: cert->valid_before == 0xffffffffffffffffULL)
3013: return strlcpy(s, "forever", l);
3014:
3015: if (cert->valid_after != 0) {
3016: /* XXX revisit INT_MAX in 2038 :) */
3017: tt = cert->valid_after > INT_MAX ?
3018: INT_MAX : cert->valid_after;
3019: tm = localtime(&tt);
3020: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
3021: }
3022: if (cert->valid_before != 0xffffffffffffffffULL) {
3023: /* XXX revisit INT_MAX in 2038 :) */
3024: tt = cert->valid_before > INT_MAX ?
3025: INT_MAX : cert->valid_before;
3026: tm = localtime(&tt);
3027: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
3028: }
3029:
3030: if (cert->valid_after == 0)
3031: snprintf(ret, sizeof(ret), "before %s", to);
3032: else if (cert->valid_before == 0xffffffffffffffffULL)
3033: snprintf(ret, sizeof(ret), "after %s", from);
3034: else
3035: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
3036:
3037: return strlcpy(s, ret, l);
1.1 djm 3038: }
3039:
3040: int
1.76 djm 3041: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 3042: enum sshkey_serialize_rep opts)
1.1 djm 3043: {
3044: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 3045: int was_shielded = sshkey_is_shielded(key);
3046: struct sshbuf *b = NULL;
1.69 djm 3047: #ifdef WITH_OPENSSL
3048: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
3049: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
3050: #endif /* WITH_OPENSSL */
1.1 djm 3051:
1.76 djm 3052: if ((r = sshkey_unshield_private(key)) != 0)
3053: return r;
3054: if ((b = sshbuf_new()) == NULL)
3055: return SSH_ERR_ALLOC_FAIL;
1.1 djm 3056: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
3057: goto out;
3058: switch (key->type) {
3059: #ifdef WITH_OPENSSL
3060: case KEY_RSA:
1.69 djm 3061: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
3062: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3063: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
3064: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
3065: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
3066: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3067: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3068: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3069: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3070: goto out;
3071: break;
3072: case KEY_RSA_CERT:
3073: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3074: r = SSH_ERR_INVALID_ARGUMENT;
3075: goto out;
3076: }
1.69 djm 3077: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
3078: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
3079: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 3080: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3081: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
3082: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
3083: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
3084: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 3085: goto out;
3086: break;
3087: case KEY_DSA:
1.69 djm 3088: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
3089: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
3090: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
3091: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
3092: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
3093: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3094: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3095: goto out;
3096: break;
3097: case KEY_DSA_CERT:
3098: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3099: r = SSH_ERR_INVALID_ARGUMENT;
3100: goto out;
3101: }
1.69 djm 3102: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3103: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3104: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3105: goto out;
3106: break;
3107: case KEY_ECDSA:
3108: if ((r = sshbuf_put_cstring(b,
3109: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3110: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3111: (r = sshbuf_put_bignum2(b,
3112: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3113: goto out;
3114: break;
3115: case KEY_ECDSA_CERT:
3116: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3117: r = SSH_ERR_INVALID_ARGUMENT;
3118: goto out;
3119: }
3120: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3121: (r = sshbuf_put_bignum2(b,
3122: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3123: goto out;
3124: break;
1.85 djm 3125: case KEY_ECDSA_SK:
3126: if ((r = sshbuf_put_cstring(b,
3127: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3128: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3129: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3130: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3131: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3132: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3133: goto out;
3134: break;
3135: case KEY_ECDSA_SK_CERT:
3136: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3137: r = SSH_ERR_INVALID_ARGUMENT;
3138: goto out;
3139: }
3140: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3141: (r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
3142: (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
3143: (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
3144: (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
3145: goto out;
3146: break;
1.1 djm 3147: #endif /* WITH_OPENSSL */
3148: case KEY_ED25519:
3149: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3150: ED25519_PK_SZ)) != 0 ||
3151: (r = sshbuf_put_string(b, key->ed25519_sk,
3152: ED25519_SK_SZ)) != 0)
3153: goto out;
3154: break;
3155: case KEY_ED25519_CERT:
3156: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3157: r = SSH_ERR_INVALID_ARGUMENT;
3158: goto out;
3159: }
3160: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3161: (r = sshbuf_put_string(b, key->ed25519_pk,
3162: ED25519_PK_SZ)) != 0 ||
3163: (r = sshbuf_put_string(b, key->ed25519_sk,
3164: ED25519_SK_SZ)) != 0)
3165: goto out;
3166: break;
1.62 markus 3167: #ifdef WITH_XMSS
3168: case KEY_XMSS:
3169: if (key->xmss_name == NULL) {
3170: r = SSH_ERR_INVALID_ARGUMENT;
3171: goto out;
3172: }
3173: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3174: (r = sshbuf_put_string(b, key->xmss_pk,
3175: sshkey_xmss_pklen(key))) != 0 ||
3176: (r = sshbuf_put_string(b, key->xmss_sk,
3177: sshkey_xmss_sklen(key))) != 0 ||
3178: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3179: goto out;
3180: break;
3181: case KEY_XMSS_CERT:
3182: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3183: key->xmss_name == NULL) {
3184: r = SSH_ERR_INVALID_ARGUMENT;
3185: goto out;
3186: }
3187: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3188: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3189: (r = sshbuf_put_string(b, key->xmss_pk,
3190: sshkey_xmss_pklen(key))) != 0 ||
3191: (r = sshbuf_put_string(b, key->xmss_sk,
3192: sshkey_xmss_sklen(key))) != 0 ||
3193: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3194: goto out;
3195: break;
3196: #endif /* WITH_XMSS */
1.1 djm 3197: default:
3198: r = SSH_ERR_INVALID_ARGUMENT;
3199: goto out;
3200: }
1.76 djm 3201: /*
3202: * success (but we still need to append the output to buf after
3203: * possibly re-shielding the private key)
3204: */
1.1 djm 3205: r = 0;
3206: out:
1.76 djm 3207: if (was_shielded)
3208: r = sshkey_shield_private(key);
3209: if (r == 0)
3210: r = sshbuf_putb(buf, b);
3211: sshbuf_free(b);
3212:
1.1 djm 3213: return r;
3214: }
3215:
3216: int
1.76 djm 3217: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3218: {
3219: return sshkey_private_serialize_opt(key, b,
3220: SSHKEY_SERIALIZE_DEFAULT);
3221: }
3222:
3223: int
1.1 djm 3224: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3225: {
1.62 markus 3226: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3227: struct sshkey *k = NULL;
1.14 djm 3228: size_t pklen = 0, sklen = 0;
1.1 djm 3229: int type, r = SSH_ERR_INTERNAL_ERROR;
3230: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3231: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3232: #ifdef WITH_OPENSSL
3233: BIGNUM *exponent = NULL;
1.69 djm 3234: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3235: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3236: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3237: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3238: #endif /* WITH_OPENSSL */
3239:
3240: if (kp != NULL)
3241: *kp = NULL;
3242: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3243: goto out;
3244: type = sshkey_type_from_name(tname);
3245: switch (type) {
3246: #ifdef WITH_OPENSSL
3247: case KEY_DSA:
1.70 djm 3248: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3249: r = SSH_ERR_ALLOC_FAIL;
3250: goto out;
3251: }
1.73 djm 3252: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3253: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3254: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3255: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3256: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3257: goto out;
3258: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3259: r = SSH_ERR_LIBCRYPTO_ERROR;
3260: goto out;
3261: }
3262: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3263: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3264: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3265: goto out;
1.69 djm 3266: }
3267: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3268: break;
3269: case KEY_DSA_CERT:
1.14 djm 3270: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3271: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3272: goto out;
1.84 djm 3273: if (k->type != type) {
3274: r = SSH_ERR_INVALID_FORMAT;
3275: goto out;
3276: }
1.69 djm 3277: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3278: r = SSH_ERR_LIBCRYPTO_ERROR;
3279: goto out;
3280: }
3281: dsa_priv_key = NULL; /* transferred */
1.1 djm 3282: break;
3283: case KEY_ECDSA:
1.70 djm 3284: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3285: r = SSH_ERR_ALLOC_FAIL;
3286: goto out;
3287: }
3288: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3289: r = SSH_ERR_INVALID_ARGUMENT;
3290: goto out;
3291: }
3292: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3293: goto out;
3294: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3295: r = SSH_ERR_EC_CURVE_MISMATCH;
3296: goto out;
3297: }
3298: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3299: if (k->ecdsa == NULL) {
1.1 djm 3300: r = SSH_ERR_LIBCRYPTO_ERROR;
3301: goto out;
3302: }
3303: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3304: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3305: goto out;
3306: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3307: r = SSH_ERR_LIBCRYPTO_ERROR;
3308: goto out;
3309: }
3310: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3311: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3312: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3313: goto out;
3314: break;
3315: case KEY_ECDSA_CERT:
1.14 djm 3316: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3317: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3318: goto out;
1.84 djm 3319: if (k->type != type ||
3320: k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
3321: r = SSH_ERR_INVALID_FORMAT;
3322: goto out;
3323: }
1.1 djm 3324: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3325: r = SSH_ERR_LIBCRYPTO_ERROR;
3326: goto out;
3327: }
3328: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3329: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3330: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3331: goto out;
3332: break;
1.85 djm 3333: case KEY_ECDSA_SK:
3334: if ((k = sshkey_new(type)) == NULL) {
3335: r = SSH_ERR_ALLOC_FAIL;
3336: goto out;
3337: }
3338: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3339: r = SSH_ERR_INVALID_ARGUMENT;
3340: goto out;
3341: }
3342: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3343: goto out;
3344: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3345: r = SSH_ERR_EC_CURVE_MISMATCH;
3346: goto out;
3347: }
3348: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3349: (k->sk_reserved = sshbuf_new()) == NULL) {
3350: r = SSH_ERR_ALLOC_FAIL;
3351: goto out;
3352: }
3353: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
3354: if (k->ecdsa == NULL) {
3355: r = SSH_ERR_LIBCRYPTO_ERROR;
3356: goto out;
3357: }
3358: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
3359: (r = sshbuf_get_cstring(buf, &k->sk_application,
3360: NULL)) != 0 ||
3361: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3362: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3363: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3364: goto out;
3365: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3366: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3367: goto out;
3368: break;
3369: case KEY_ECDSA_SK_CERT:
3370: if ((r = sshkey_froms(buf, &k)) != 0)
3371: goto out;
3372: if ((k->sk_key_handle = sshbuf_new()) == NULL ||
3373: (k->sk_reserved = sshbuf_new()) == NULL) {
3374: r = SSH_ERR_ALLOC_FAIL;
3375: goto out;
3376: }
3377: if ((r = sshbuf_get_cstring(buf, &k->sk_application,
3378: NULL)) != 0 ||
3379: (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
3380: (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
3381: (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
3382: goto out;
3383: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
3384: EC_KEY_get0_public_key(k->ecdsa))) != 0)
3385: goto out;
3386: break;
1.1 djm 3387: case KEY_RSA:
1.70 djm 3388: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3389: r = SSH_ERR_ALLOC_FAIL;
3390: goto out;
3391: }
1.73 djm 3392: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3393: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3394: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3395: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3396: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3397: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3398: goto out;
1.69 djm 3399: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3400: r = SSH_ERR_LIBCRYPTO_ERROR;
3401: goto out;
3402: }
3403: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3404: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3405: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3406: goto out;
3407: }
1.69 djm 3408: rsa_p = rsa_q = NULL; /* transferred */
3409: if ((r = check_rsa_length(k->rsa)) != 0)
3410: goto out;
3411: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3412: goto out;
1.1 djm 3413: break;
3414: case KEY_RSA_CERT:
1.14 djm 3415: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3416: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3417: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3418: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3419: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3420: goto out;
1.84 djm 3421: if (k->type != type) {
3422: r = SSH_ERR_INVALID_FORMAT;
3423: goto out;
3424: }
1.69 djm 3425: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3426: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3427: goto out;
3428: }
1.69 djm 3429: rsa_d = NULL; /* transferred */
3430: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3431: r = SSH_ERR_LIBCRYPTO_ERROR;
3432: goto out;
3433: }
3434: rsa_p = rsa_q = NULL; /* transferred */
3435: if ((r = check_rsa_length(k->rsa)) != 0)
3436: goto out;
3437: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3438: goto out;
1.1 djm 3439: break;
3440: #endif /* WITH_OPENSSL */
3441: case KEY_ED25519:
1.70 djm 3442: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3443: r = SSH_ERR_ALLOC_FAIL;
3444: goto out;
3445: }
3446: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3447: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3448: goto out;
3449: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3450: r = SSH_ERR_INVALID_FORMAT;
3451: goto out;
3452: }
3453: k->ed25519_pk = ed25519_pk;
3454: k->ed25519_sk = ed25519_sk;
3455: ed25519_pk = ed25519_sk = NULL;
3456: break;
3457: case KEY_ED25519_CERT:
1.14 djm 3458: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3459: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3460: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3461: goto out;
1.84 djm 3462: if (k->type != type) {
3463: r = SSH_ERR_INVALID_FORMAT;
3464: goto out;
3465: }
1.1 djm 3466: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3467: r = SSH_ERR_INVALID_FORMAT;
3468: goto out;
3469: }
3470: k->ed25519_pk = ed25519_pk;
3471: k->ed25519_sk = ed25519_sk;
1.84 djm 3472: ed25519_pk = ed25519_sk = NULL; /* transferred */
1.1 djm 3473: break;
1.62 markus 3474: #ifdef WITH_XMSS
3475: case KEY_XMSS:
1.70 djm 3476: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3477: r = SSH_ERR_ALLOC_FAIL;
3478: goto out;
3479: }
3480: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3481: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3482: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3483: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3484: goto out;
3485: if (pklen != sshkey_xmss_pklen(k) ||
3486: sklen != sshkey_xmss_sklen(k)) {
3487: r = SSH_ERR_INVALID_FORMAT;
3488: goto out;
3489: }
3490: k->xmss_pk = xmss_pk;
3491: k->xmss_sk = xmss_sk;
3492: xmss_pk = xmss_sk = NULL;
3493: /* optional internal state */
3494: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3495: goto out;
3496: break;
3497: case KEY_XMSS_CERT:
3498: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3499: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3500: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3501: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3502: goto out;
1.84 djm 3503: if (k->type != type || strcmp(xmss_name, k->xmss_name) != 0) {
1.64 markus 3504: r = SSH_ERR_INVALID_FORMAT;
3505: goto out;
3506: }
1.62 markus 3507: if (pklen != sshkey_xmss_pklen(k) ||
3508: sklen != sshkey_xmss_sklen(k)) {
3509: r = SSH_ERR_INVALID_FORMAT;
3510: goto out;
3511: }
3512: k->xmss_pk = xmss_pk;
3513: k->xmss_sk = xmss_sk;
3514: xmss_pk = xmss_sk = NULL;
3515: /* optional internal state */
3516: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3517: goto out;
3518: break;
3519: #endif /* WITH_XMSS */
1.1 djm 3520: default:
3521: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3522: goto out;
3523: }
3524: #ifdef WITH_OPENSSL
3525: /* enable blinding */
3526: switch (k->type) {
3527: case KEY_RSA:
3528: case KEY_RSA_CERT:
3529: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3530: r = SSH_ERR_LIBCRYPTO_ERROR;
3531: goto out;
3532: }
3533: break;
3534: }
3535: #endif /* WITH_OPENSSL */
3536: /* success */
3537: r = 0;
3538: if (kp != NULL) {
3539: *kp = k;
3540: k = NULL;
3541: }
3542: out:
3543: free(tname);
3544: free(curve);
3545: #ifdef WITH_OPENSSL
1.60 jsing 3546: BN_clear_free(exponent);
1.69 djm 3547: BN_clear_free(dsa_p);
3548: BN_clear_free(dsa_q);
3549: BN_clear_free(dsa_g);
3550: BN_clear_free(dsa_pub_key);
3551: BN_clear_free(dsa_priv_key);
3552: BN_clear_free(rsa_n);
3553: BN_clear_free(rsa_e);
3554: BN_clear_free(rsa_d);
3555: BN_clear_free(rsa_p);
3556: BN_clear_free(rsa_q);
3557: BN_clear_free(rsa_iqmp);
1.1 djm 3558: #endif /* WITH_OPENSSL */
3559: sshkey_free(k);
1.61 jsing 3560: freezero(ed25519_pk, pklen);
3561: freezero(ed25519_sk, sklen);
1.62 markus 3562: free(xmss_name);
3563: freezero(xmss_pk, pklen);
3564: freezero(xmss_sk, sklen);
1.1 djm 3565: return r;
3566: }
3567:
3568: #ifdef WITH_OPENSSL
3569: int
3570: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3571: {
3572: BN_CTX *bnctx;
3573: EC_POINT *nq = NULL;
3574: BIGNUM *order, *x, *y, *tmp;
3575: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3576:
3577: /*
3578: * NB. This assumes OpenSSL has already verified that the public
3579: * point lies on the curve. This is done by EC_POINT_oct2point()
3580: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3581: * reachable with public points not unmarshalled using
3582: * EC_POINT_oct2point then the caller will need to explicitly check.
3583: */
1.1 djm 3584:
3585: if ((bnctx = BN_CTX_new()) == NULL)
3586: return SSH_ERR_ALLOC_FAIL;
3587: BN_CTX_start(bnctx);
3588:
3589: /*
3590: * We shouldn't ever hit this case because bignum_get_ecpoint()
3591: * refuses to load GF2m points.
3592: */
3593: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3594: NID_X9_62_prime_field)
3595: goto out;
3596:
3597: /* Q != infinity */
3598: if (EC_POINT_is_at_infinity(group, public))
3599: goto out;
3600:
3601: if ((x = BN_CTX_get(bnctx)) == NULL ||
3602: (y = BN_CTX_get(bnctx)) == NULL ||
3603: (order = BN_CTX_get(bnctx)) == NULL ||
3604: (tmp = BN_CTX_get(bnctx)) == NULL) {
3605: ret = SSH_ERR_ALLOC_FAIL;
3606: goto out;
3607: }
3608:
3609: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3610: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3611: EC_POINT_get_affine_coordinates_GFp(group, public,
3612: x, y, bnctx) != 1) {
3613: ret = SSH_ERR_LIBCRYPTO_ERROR;
3614: goto out;
3615: }
3616: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3617: BN_num_bits(y) <= BN_num_bits(order) / 2)
3618: goto out;
3619:
3620: /* nQ == infinity (n == order of subgroup) */
3621: if ((nq = EC_POINT_new(group)) == NULL) {
3622: ret = SSH_ERR_ALLOC_FAIL;
3623: goto out;
3624: }
3625: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3626: ret = SSH_ERR_LIBCRYPTO_ERROR;
3627: goto out;
3628: }
3629: if (EC_POINT_is_at_infinity(group, nq) != 1)
3630: goto out;
3631:
3632: /* x < order - 1, y < order - 1 */
3633: if (!BN_sub(tmp, order, BN_value_one())) {
3634: ret = SSH_ERR_LIBCRYPTO_ERROR;
3635: goto out;
3636: }
3637: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3638: goto out;
3639: ret = 0;
3640: out:
3641: BN_CTX_free(bnctx);
1.60 jsing 3642: EC_POINT_free(nq);
1.1 djm 3643: return ret;
3644: }
3645:
3646: int
3647: sshkey_ec_validate_private(const EC_KEY *key)
3648: {
3649: BN_CTX *bnctx;
3650: BIGNUM *order, *tmp;
3651: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3652:
3653: if ((bnctx = BN_CTX_new()) == NULL)
3654: return SSH_ERR_ALLOC_FAIL;
3655: BN_CTX_start(bnctx);
3656:
3657: if ((order = BN_CTX_get(bnctx)) == NULL ||
3658: (tmp = BN_CTX_get(bnctx)) == NULL) {
3659: ret = SSH_ERR_ALLOC_FAIL;
3660: goto out;
3661: }
3662:
3663: /* log2(private) > log2(order)/2 */
3664: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3665: ret = SSH_ERR_LIBCRYPTO_ERROR;
3666: goto out;
3667: }
3668: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3669: BN_num_bits(order) / 2)
3670: goto out;
3671:
3672: /* private < order - 1 */
3673: if (!BN_sub(tmp, order, BN_value_one())) {
3674: ret = SSH_ERR_LIBCRYPTO_ERROR;
3675: goto out;
3676: }
3677: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3678: goto out;
3679: ret = 0;
3680: out:
3681: BN_CTX_free(bnctx);
3682: return ret;
3683: }
3684:
3685: void
3686: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3687: {
3688: BIGNUM *x, *y;
3689: BN_CTX *bnctx;
3690:
3691: if (point == NULL) {
3692: fputs("point=(NULL)\n", stderr);
3693: return;
3694: }
3695: if ((bnctx = BN_CTX_new()) == NULL) {
3696: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3697: return;
3698: }
3699: BN_CTX_start(bnctx);
3700: if ((x = BN_CTX_get(bnctx)) == NULL ||
3701: (y = BN_CTX_get(bnctx)) == NULL) {
3702: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3703: return;
3704: }
3705: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3706: NID_X9_62_prime_field) {
3707: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3708: return;
3709: }
3710: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3711: bnctx) != 1) {
3712: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3713: __func__);
3714: return;
3715: }
3716: fputs("x=", stderr);
3717: BN_print_fp(stderr, x);
3718: fputs("\ny=", stderr);
3719: BN_print_fp(stderr, y);
3720: fputs("\n", stderr);
3721: BN_CTX_free(bnctx);
3722: }
3723:
3724: void
3725: sshkey_dump_ec_key(const EC_KEY *key)
3726: {
3727: const BIGNUM *exponent;
3728:
3729: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3730: EC_KEY_get0_public_key(key));
3731: fputs("exponent=", stderr);
3732: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3733: fputs("(NULL)", stderr);
3734: else
3735: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3736: fputs("\n", stderr);
3737: }
3738: #endif /* WITH_OPENSSL */
3739:
3740: static int
1.76 djm 3741: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3742: const char *passphrase, const char *comment, const char *ciphername,
3743: int rounds)
3744: {
1.4 djm 3745: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3746: u_char salt[SALT_LEN];
1.4 djm 3747: char *b64 = NULL;
1.1 djm 3748: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3749: u_int check;
3750: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3751: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3752: const struct sshcipher *cipher;
3753: const char *kdfname = KDFNAME;
3754: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3755:
3756: if (rounds <= 0)
3757: rounds = DEFAULT_ROUNDS;
3758: if (passphrase == NULL || !strlen(passphrase)) {
3759: ciphername = "none";
3760: kdfname = "none";
3761: } else if (ciphername == NULL)
3762: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3763: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3764: r = SSH_ERR_INVALID_ARGUMENT;
3765: goto out;
3766: }
3767:
3768: if ((kdf = sshbuf_new()) == NULL ||
3769: (encoded = sshbuf_new()) == NULL ||
3770: (encrypted = sshbuf_new()) == NULL) {
3771: r = SSH_ERR_ALLOC_FAIL;
3772: goto out;
3773: }
3774: blocksize = cipher_blocksize(cipher);
3775: keylen = cipher_keylen(cipher);
3776: ivlen = cipher_ivlen(cipher);
3777: authlen = cipher_authlen(cipher);
3778: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3779: r = SSH_ERR_ALLOC_FAIL;
3780: goto out;
3781: }
3782: if (strcmp(kdfname, "bcrypt") == 0) {
3783: arc4random_buf(salt, SALT_LEN);
3784: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3785: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3786: r = SSH_ERR_INVALID_ARGUMENT;
3787: goto out;
3788: }
3789: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3790: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3791: goto out;
3792: } else if (strcmp(kdfname, "none") != 0) {
3793: /* Unsupported KDF type */
3794: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3795: goto out;
3796: }
3797: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3798: key + keylen, ivlen, 1)) != 0)
3799: goto out;
3800:
3801: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3802: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3803: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3804: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3805: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3806: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3807: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3808: goto out;
3809:
3810: /* set up the buffer that will be encrypted */
3811:
3812: /* Random check bytes */
3813: check = arc4random();
3814: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3815: (r = sshbuf_put_u32(encrypted, check)) != 0)
3816: goto out;
3817:
3818: /* append private key and comment*/
1.62 markus 3819: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3820: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3821: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3822: goto out;
3823:
3824: /* padding */
3825: i = 0;
3826: while (sshbuf_len(encrypted) % blocksize) {
3827: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3828: goto out;
3829: }
3830:
3831: /* length in destination buffer */
3832: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3833: goto out;
3834:
3835: /* encrypt */
3836: if ((r = sshbuf_reserve(encoded,
3837: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3838: goto out;
1.36 djm 3839: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3840: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3841: goto out;
3842:
1.81 djm 3843: sshbuf_reset(blob);
1.1 djm 3844:
1.81 djm 3845: /* assemble uuencoded key */
3846: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3847: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3848: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3849: goto out;
3850:
3851: /* success */
3852: r = 0;
3853:
3854: out:
3855: sshbuf_free(kdf);
3856: sshbuf_free(encoded);
3857: sshbuf_free(encrypted);
1.36 djm 3858: cipher_free(ciphercontext);
1.1 djm 3859: explicit_bzero(salt, sizeof(salt));
3860: if (key != NULL) {
3861: explicit_bzero(key, keylen + ivlen);
3862: free(key);
3863: }
3864: if (pubkeyblob != NULL) {
3865: explicit_bzero(pubkeyblob, pubkeylen);
3866: free(pubkeyblob);
3867: }
3868: if (b64 != NULL) {
3869: explicit_bzero(b64, strlen(b64));
3870: free(b64);
3871: }
3872: return r;
3873: }
3874:
3875: static int
3876: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3877: struct sshkey **keyp, char **commentp)
3878: {
3879: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3880: const struct sshcipher *cipher = NULL;
3881: const u_char *cp;
3882: int r = SSH_ERR_INTERNAL_ERROR;
3883: size_t encoded_len;
1.18 djm 3884: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3885: struct sshbuf *encoded = NULL, *decoded = NULL;
3886: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3887: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3888: struct sshkey *k = NULL;
3889: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3890: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3891:
3892: if (keyp != NULL)
3893: *keyp = NULL;
3894: if (commentp != NULL)
3895: *commentp = NULL;
3896:
3897: if ((encoded = sshbuf_new()) == NULL ||
3898: (decoded = sshbuf_new()) == NULL ||
3899: (decrypted = sshbuf_new()) == NULL) {
3900: r = SSH_ERR_ALLOC_FAIL;
3901: goto out;
3902: }
3903:
3904: /* check preamble */
3905: cp = sshbuf_ptr(blob);
3906: encoded_len = sshbuf_len(blob);
3907: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3908: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3909: r = SSH_ERR_INVALID_FORMAT;
3910: goto out;
3911: }
3912: cp += MARK_BEGIN_LEN;
3913: encoded_len -= MARK_BEGIN_LEN;
3914:
3915: /* Look for end marker, removing whitespace as we go */
3916: while (encoded_len > 0) {
3917: if (*cp != '\n' && *cp != '\r') {
3918: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3919: goto out;
3920: }
3921: last = *cp;
3922: encoded_len--;
3923: cp++;
3924: if (last == '\n') {
3925: if (encoded_len >= MARK_END_LEN &&
3926: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3927: /* \0 terminate */
3928: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3929: goto out;
3930: break;
3931: }
3932: }
3933: }
3934: if (encoded_len == 0) {
3935: r = SSH_ERR_INVALID_FORMAT;
3936: goto out;
3937: }
3938:
3939: /* decode base64 */
1.4 djm 3940: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3941: goto out;
3942:
3943: /* check magic */
3944: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3945: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3946: r = SSH_ERR_INVALID_FORMAT;
3947: goto out;
3948: }
3949: /* parse public portion of key */
3950: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3951: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3952: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3953: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3954: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3955: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3956: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3957: goto out;
3958:
3959: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3960: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3961: goto out;
3962: }
3963: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3964: strcmp(ciphername, "none") != 0) {
3965: /* passphrase required */
3966: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3967: goto out;
3968: }
3969: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3970: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3971: goto out;
3972: }
3973: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3974: r = SSH_ERR_INVALID_FORMAT;
3975: goto out;
3976: }
3977: if (nkeys != 1) {
3978: /* XXX only one key supported */
3979: r = SSH_ERR_INVALID_FORMAT;
3980: goto out;
3981: }
3982:
3983: /* check size of encrypted key blob */
3984: blocksize = cipher_blocksize(cipher);
3985: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3986: r = SSH_ERR_INVALID_FORMAT;
3987: goto out;
3988: }
3989:
3990: /* setup key */
3991: keylen = cipher_keylen(cipher);
3992: ivlen = cipher_ivlen(cipher);
1.18 djm 3993: authlen = cipher_authlen(cipher);
1.1 djm 3994: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3995: r = SSH_ERR_ALLOC_FAIL;
3996: goto out;
3997: }
3998: if (strcmp(kdfname, "bcrypt") == 0) {
3999: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
4000: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
4001: goto out;
4002: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
4003: key, keylen + ivlen, rounds) < 0) {
4004: r = SSH_ERR_INVALID_FORMAT;
4005: goto out;
4006: }
4007: }
4008:
1.18 djm 4009: /* check that an appropriate amount of auth data is present */
1.84 djm 4010: if (sshbuf_len(decoded) < authlen ||
4011: sshbuf_len(decoded) - authlen < encrypted_len) {
1.18 djm 4012: r = SSH_ERR_INVALID_FORMAT;
4013: goto out;
4014: }
4015:
1.1 djm 4016: /* decrypt private portion of key */
4017: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
4018: (r = cipher_init(&ciphercontext, cipher, key, keylen,
4019: key + keylen, ivlen, 0)) != 0)
4020: goto out;
1.36 djm 4021: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 4022: encrypted_len, 0, authlen)) != 0) {
1.1 djm 4023: /* an integrity error here indicates an incorrect passphrase */
4024: if (r == SSH_ERR_MAC_INVALID)
4025: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4026: goto out;
4027: }
1.18 djm 4028: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 4029: goto out;
4030: /* there should be no trailing data */
4031: if (sshbuf_len(decoded) != 0) {
4032: r = SSH_ERR_INVALID_FORMAT;
4033: goto out;
4034: }
4035:
4036: /* check check bytes */
4037: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
4038: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
4039: goto out;
4040: if (check1 != check2) {
4041: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4042: goto out;
4043: }
4044:
4045: /* Load the private key and comment */
4046: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
4047: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
4048: goto out;
4049:
4050: /* Check deterministic padding */
4051: i = 0;
4052: while (sshbuf_len(decrypted)) {
4053: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
4054: goto out;
4055: if (pad != (++i & 0xff)) {
4056: r = SSH_ERR_INVALID_FORMAT;
4057: goto out;
4058: }
4059: }
4060:
4061: /* XXX decode pubkey and check against private */
4062:
4063: /* success */
4064: r = 0;
4065: if (keyp != NULL) {
4066: *keyp = k;
4067: k = NULL;
4068: }
4069: if (commentp != NULL) {
4070: *commentp = comment;
4071: comment = NULL;
4072: }
4073: out:
4074: pad = 0;
1.36 djm 4075: cipher_free(ciphercontext);
1.1 djm 4076: free(ciphername);
4077: free(kdfname);
4078: free(comment);
4079: if (salt != NULL) {
4080: explicit_bzero(salt, slen);
4081: free(salt);
4082: }
4083: if (key != NULL) {
4084: explicit_bzero(key, keylen + ivlen);
4085: free(key);
4086: }
4087: sshbuf_free(encoded);
4088: sshbuf_free(decoded);
4089: sshbuf_free(kdf);
4090: sshbuf_free(decrypted);
4091: sshkey_free(k);
4092: return r;
4093: }
4094:
4095:
4096: #ifdef WITH_OPENSSL
1.80 djm 4097: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 4098: static int
1.80 djm 4099: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
4100: int format, const char *_passphrase, const char *comment)
1.1 djm 4101: {
1.76 djm 4102: int was_shielded = sshkey_is_shielded(key);
1.1 djm 4103: int success, r;
4104: int blen, len = strlen(_passphrase);
4105: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
4106: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 4107: char *bptr;
1.1 djm 4108: BIO *bio = NULL;
1.76 djm 4109: struct sshbuf *blob;
1.80 djm 4110: EVP_PKEY *pkey = NULL;
1.1 djm 4111:
4112: if (len > 0 && len <= 4)
4113: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 4114: if ((blob = sshbuf_new()) == NULL)
1.1 djm 4115: return SSH_ERR_ALLOC_FAIL;
1.76 djm 4116: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 4117: r = SSH_ERR_ALLOC_FAIL;
4118: goto out;
4119: }
4120: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
4121: r = SSH_ERR_ALLOC_FAIL;
4122: goto out;
1.76 djm 4123: }
4124: if ((r = sshkey_unshield_private(key)) != 0)
4125: goto out;
1.1 djm 4126:
4127: switch (key->type) {
4128: case KEY_DSA:
1.80 djm 4129: if (format == SSHKEY_PRIVATE_PEM) {
4130: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
4131: cipher, passphrase, len, NULL, NULL);
4132: } else {
4133: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
4134: }
1.1 djm 4135: break;
4136: case KEY_ECDSA:
1.80 djm 4137: if (format == SSHKEY_PRIVATE_PEM) {
4138: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
4139: cipher, passphrase, len, NULL, NULL);
4140: } else {
4141: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
4142: }
1.1 djm 4143: break;
4144: case KEY_RSA:
1.80 djm 4145: if (format == SSHKEY_PRIVATE_PEM) {
4146: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
4147: cipher, passphrase, len, NULL, NULL);
4148: } else {
4149: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
4150: }
1.1 djm 4151: break;
4152: default:
4153: success = 0;
4154: break;
4155: }
4156: if (success == 0) {
4157: r = SSH_ERR_LIBCRYPTO_ERROR;
4158: goto out;
4159: }
1.80 djm 4160: if (format == SSHKEY_PRIVATE_PKCS8) {
4161: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
4162: passphrase, len, NULL, NULL)) == 0) {
4163: r = SSH_ERR_LIBCRYPTO_ERROR;
4164: goto out;
4165: }
4166: }
1.1 djm 4167: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
4168: r = SSH_ERR_INTERNAL_ERROR;
4169: goto out;
4170: }
4171: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
4172: goto out;
4173: r = 0;
4174: out:
1.76 djm 4175: if (was_shielded)
4176: r = sshkey_shield_private(key);
4177: if (r == 0)
4178: r = sshbuf_putb(buf, blob);
1.80 djm 4179:
4180: EVP_PKEY_free(pkey);
1.76 djm 4181: sshbuf_free(blob);
1.1 djm 4182: BIO_free(bio);
4183: return r;
4184: }
4185: #endif /* WITH_OPENSSL */
4186:
4187: /* Serialise "key" to buffer "blob" */
4188: int
4189: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4190: const char *passphrase, const char *comment,
1.80 djm 4191: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4192: {
4193: switch (key->type) {
1.9 markus 4194: #ifdef WITH_OPENSSL
1.1 djm 4195: case KEY_DSA:
4196: case KEY_ECDSA:
4197: case KEY_RSA:
1.80 djm 4198: break; /* see below */
1.1 djm 4199: #endif /* WITH_OPENSSL */
4200: case KEY_ED25519:
1.62 markus 4201: #ifdef WITH_XMSS
4202: case KEY_XMSS:
4203: #endif /* WITH_XMSS */
1.85 djm 4204: #ifdef WITH_OPENSSL
4205: case KEY_ECDSA_SK:
4206: #endif /* WITH_OPENSSL */
1.1 djm 4207: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4208: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4209: default:
4210: return SSH_ERR_KEY_TYPE_UNKNOWN;
4211: }
1.80 djm 4212:
4213: #ifdef WITH_OPENSSL
4214: switch (format) {
4215: case SSHKEY_PRIVATE_OPENSSH:
4216: return sshkey_private_to_blob2(key, blob, passphrase,
4217: comment, openssh_format_cipher, openssh_format_rounds);
4218: case SSHKEY_PRIVATE_PEM:
4219: case SSHKEY_PRIVATE_PKCS8:
4220: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4221: format, passphrase, comment);
4222: default:
4223: return SSH_ERR_INVALID_ARGUMENT;
4224: }
4225: #endif /* WITH_OPENSSL */
1.1 djm 4226: }
4227:
4228: #ifdef WITH_OPENSSL
1.8 djm 4229: static int
1.52 djm 4230: translate_libcrypto_error(unsigned long pem_err)
4231: {
4232: int pem_reason = ERR_GET_REASON(pem_err);
4233:
4234: switch (ERR_GET_LIB(pem_err)) {
4235: case ERR_LIB_PEM:
4236: switch (pem_reason) {
4237: case PEM_R_BAD_PASSWORD_READ:
4238: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4239: case PEM_R_BAD_DECRYPT:
4240: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4241: default:
4242: return SSH_ERR_INVALID_FORMAT;
4243: }
4244: case ERR_LIB_EVP:
4245: switch (pem_reason) {
4246: case EVP_R_BAD_DECRYPT:
4247: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4248: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4249: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4250: #endif
1.52 djm 4251: case EVP_R_DECODE_ERROR:
4252: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4253: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4254: #endif
4255: return SSH_ERR_INVALID_FORMAT;
4256: default:
4257: return SSH_ERR_LIBCRYPTO_ERROR;
4258: }
4259: case ERR_LIB_ASN1:
4260: return SSH_ERR_INVALID_FORMAT;
4261: }
4262: return SSH_ERR_LIBCRYPTO_ERROR;
4263: }
4264:
4265: static void
4266: clear_libcrypto_errors(void)
4267: {
4268: while (ERR_get_error() != 0)
4269: ;
4270: }
4271:
4272: /*
4273: * Translate OpenSSL error codes to determine whether
4274: * passphrase is required/incorrect.
4275: */
4276: static int
4277: convert_libcrypto_error(void)
4278: {
4279: /*
4280: * Some password errors are reported at the beginning
4281: * of the error queue.
4282: */
4283: if (translate_libcrypto_error(ERR_peek_error()) ==
4284: SSH_ERR_KEY_WRONG_PASSPHRASE)
4285: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4286: return translate_libcrypto_error(ERR_peek_last_error());
4287: }
4288:
4289: static int
1.1 djm 4290: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4291: const char *passphrase, struct sshkey **keyp)
1.1 djm 4292: {
4293: EVP_PKEY *pk = NULL;
4294: struct sshkey *prv = NULL;
4295: BIO *bio = NULL;
4296: int r;
4297:
1.32 djm 4298: if (keyp != NULL)
4299: *keyp = NULL;
1.1 djm 4300:
4301: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4302: return SSH_ERR_ALLOC_FAIL;
4303: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4304: (int)sshbuf_len(blob)) {
4305: r = SSH_ERR_ALLOC_FAIL;
4306: goto out;
4307: }
4308:
1.52 djm 4309: clear_libcrypto_errors();
1.1 djm 4310: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4311: (char *)passphrase)) == NULL) {
1.71 djm 4312: /*
4313: * libcrypto may return various ASN.1 errors when attempting
4314: * to parse a key with an incorrect passphrase.
4315: * Treat all format errors as "incorrect passphrase" if a
4316: * passphrase was supplied.
4317: */
4318: if (passphrase != NULL && *passphrase != '\0')
4319: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4320: else
4321: r = convert_libcrypto_error();
1.1 djm 4322: goto out;
4323: }
1.69 djm 4324: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4325: (type == KEY_UNSPEC || type == KEY_RSA)) {
4326: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4327: r = SSH_ERR_ALLOC_FAIL;
4328: goto out;
4329: }
4330: prv->rsa = EVP_PKEY_get1_RSA(pk);
4331: prv->type = KEY_RSA;
4332: #ifdef DEBUG_PK
4333: RSA_print_fp(stderr, prv->rsa, 8);
4334: #endif
4335: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4336: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4337: goto out;
4338: }
1.69 djm 4339: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4340: goto out;
1.69 djm 4341: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4342: (type == KEY_UNSPEC || type == KEY_DSA)) {
4343: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4344: r = SSH_ERR_ALLOC_FAIL;
4345: goto out;
4346: }
4347: prv->dsa = EVP_PKEY_get1_DSA(pk);
4348: prv->type = KEY_DSA;
4349: #ifdef DEBUG_PK
4350: DSA_print_fp(stderr, prv->dsa, 8);
4351: #endif
1.69 djm 4352: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4353: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4354: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4355: r = SSH_ERR_ALLOC_FAIL;
4356: goto out;
4357: }
4358: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4359: prv->type = KEY_ECDSA;
4360: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4361: if (prv->ecdsa_nid == -1 ||
4362: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4363: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4364: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4365: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4366: r = SSH_ERR_INVALID_FORMAT;
4367: goto out;
4368: }
4369: #ifdef DEBUG_PK
4370: if (prv != NULL && prv->ecdsa != NULL)
4371: sshkey_dump_ec_key(prv->ecdsa);
4372: #endif
4373: } else {
4374: r = SSH_ERR_INVALID_FORMAT;
4375: goto out;
4376: }
4377: r = 0;
1.32 djm 4378: if (keyp != NULL) {
4379: *keyp = prv;
4380: prv = NULL;
4381: }
1.1 djm 4382: out:
4383: BIO_free(bio);
1.60 jsing 4384: EVP_PKEY_free(pk);
1.30 mmcc 4385: sshkey_free(prv);
1.1 djm 4386: return r;
4387: }
4388: #endif /* WITH_OPENSSL */
4389:
4390: int
4391: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4392: const char *passphrase, struct sshkey **keyp, char **commentp)
4393: {
1.42 djm 4394: int r = SSH_ERR_INTERNAL_ERROR;
4395:
1.32 djm 4396: if (keyp != NULL)
4397: *keyp = NULL;
1.1 djm 4398: if (commentp != NULL)
4399: *commentp = NULL;
4400:
4401: switch (type) {
1.9 markus 4402: #ifdef WITH_OPENSSL
1.1 djm 4403: case KEY_DSA:
4404: case KEY_ECDSA:
4405: case KEY_RSA:
1.8 djm 4406: return sshkey_parse_private_pem_fileblob(blob, type,
4407: passphrase, keyp);
1.1 djm 4408: #endif /* WITH_OPENSSL */
4409: case KEY_ED25519:
1.62 markus 4410: #ifdef WITH_XMSS
4411: case KEY_XMSS:
4412: #endif /* WITH_XMSS */
1.1 djm 4413: return sshkey_parse_private2(blob, type, passphrase,
4414: keyp, commentp);
4415: case KEY_UNSPEC:
1.42 djm 4416: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4417: commentp);
4418: /* Do not fallback to PEM parser if only passphrase is wrong. */
4419: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4420: return r;
1.1 djm 4421: #ifdef WITH_OPENSSL
1.8 djm 4422: return sshkey_parse_private_pem_fileblob(blob, type,
4423: passphrase, keyp);
1.1 djm 4424: #else
4425: return SSH_ERR_INVALID_FORMAT;
4426: #endif /* WITH_OPENSSL */
4427: default:
4428: return SSH_ERR_KEY_TYPE_UNKNOWN;
4429: }
4430: }
4431:
4432: int
4433: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4434: struct sshkey **keyp, char **commentp)
1.1 djm 4435: {
4436: if (keyp != NULL)
4437: *keyp = NULL;
4438: if (commentp != NULL)
4439: *commentp = NULL;
4440:
1.23 tim 4441: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4442: passphrase, keyp, commentp);
1.1 djm 4443: }
1.62 markus 4444:
4445: #ifdef WITH_XMSS
4446: /*
4447: * serialize the key with the current state and forward the state
4448: * maxsign times.
4449: */
4450: int
1.77 djm 4451: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4452: u_int32_t maxsign, sshkey_printfn *pr)
4453: {
4454: int r, rupdate;
4455:
4456: if (maxsign == 0 ||
4457: sshkey_type_plain(k->type) != KEY_XMSS)
4458: return sshkey_private_serialize_opt(k, b,
4459: SSHKEY_SERIALIZE_DEFAULT);
4460: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4461: (r = sshkey_private_serialize_opt(k, b,
4462: SSHKEY_SERIALIZE_STATE)) != 0 ||
4463: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4464: goto out;
4465: r = 0;
4466: out:
4467: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4468: if (r == 0)
4469: r = rupdate;
4470: }
4471: return r;
4472: }
4473:
4474: u_int32_t
4475: sshkey_signatures_left(const struct sshkey *k)
4476: {
4477: if (sshkey_type_plain(k->type) == KEY_XMSS)
4478: return sshkey_xmss_signatures_left(k);
4479: return 0;
4480: }
4481:
4482: int
4483: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4484: {
4485: if (sshkey_type_plain(k->type) != KEY_XMSS)
4486: return SSH_ERR_INVALID_ARGUMENT;
4487: return sshkey_xmss_enable_maxsign(k, maxsign);
4488: }
4489:
4490: int
4491: sshkey_set_filename(struct sshkey *k, const char *filename)
4492: {
4493: if (k == NULL)
4494: return SSH_ERR_INVALID_ARGUMENT;
4495: if (sshkey_type_plain(k->type) != KEY_XMSS)
4496: return 0;
4497: if (filename == NULL)
4498: return SSH_ERR_INVALID_ARGUMENT;
4499: if ((k->xmss_filename = strdup(filename)) == NULL)
4500: return SSH_ERR_ALLOC_FAIL;
4501: return 0;
4502: }
4503: #else
4504: int
1.76 djm 4505: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4506: u_int32_t maxsign, sshkey_printfn *pr)
4507: {
4508: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4509: }
4510:
4511: u_int32_t
4512: sshkey_signatures_left(const struct sshkey *k)
4513: {
4514: return 0;
4515: }
4516:
4517: int
4518: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4519: {
4520: return SSH_ERR_INVALID_ARGUMENT;
4521: }
4522:
4523: int
4524: sshkey_set_filename(struct sshkey *k, const char *filename)
4525: {
4526: if (k == NULL)
4527: return SSH_ERR_INVALID_ARGUMENT;
4528: return 0;
4529: }
4530: #endif /* WITH_XMSS */
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