Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.82
1.82 ! djm 1: /* $OpenBSD: sshkey.c,v 1.81 2019/07/16 13:18:39 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4: * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5: * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/types.h>
1.7 djm 29: #include <netinet/in.h>
1.1 djm 30:
1.12 djm 31: #ifdef WITH_OPENSSL
1.1 djm 32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
1.12 djm 35: #endif
1.1 djm 36:
37: #include "crypto_api.h"
38:
39: #include <errno.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <util.h>
1.13 deraadt 43: #include <limits.h>
1.7 djm 44: #include <resolv.h>
1.1 djm 45:
46: #include "ssh2.h"
47: #include "ssherr.h"
48: #include "misc.h"
49: #include "sshbuf.h"
50: #include "cipher.h"
51: #include "digest.h"
52: #define SSHKEY_INTERNAL
53: #include "sshkey.h"
1.11 djm 54: #include "match.h"
1.1 djm 55:
1.74 dtucker 56: #ifdef WITH_XMSS
57: #include "sshkey-xmss.h"
1.62 markus 58: #include "xmss_fast.h"
1.74 dtucker 59: #endif
1.62 markus 60:
1.1 djm 61: /* openssh private key file format */
62: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
63: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
64: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
65: #define MARK_END_LEN (sizeof(MARK_END) - 1)
66: #define KDFNAME "bcrypt"
67: #define AUTH_MAGIC "openssh-key-v1"
68: #define SALT_LEN 16
1.56 djm 69: #define DEFAULT_CIPHERNAME "aes256-ctr"
1.1 djm 70: #define DEFAULT_ROUNDS 16
71:
72: /* Version identification string for SSH v1 identity files. */
73: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
74:
1.76 djm 75: /*
76: * Constants relating to "shielding" support; protection of keys expected
77: * to remain in memory for long durations
78: */
79: #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024)
80: #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */
81: #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512
82:
83: int sshkey_private_serialize_opt(struct sshkey *key,
1.62 markus 84: struct sshbuf *buf, enum sshkey_serialize_rep);
1.14 djm 85: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 86: struct sshkey **keyp, int allow_cert);
87:
88: /* Supported key types */
89: struct keytype {
90: const char *name;
91: const char *shortname;
1.65 djm 92: const char *sigalg;
1.1 djm 93: int type;
94: int nid;
95: int cert;
1.28 markus 96: int sigonly;
1.1 djm 97: };
98: static const struct keytype keytypes[] = {
1.65 djm 99: { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 },
100: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL,
1.28 markus 101: KEY_ED25519_CERT, 0, 1, 0 },
1.62 markus 102: #ifdef WITH_XMSS
1.65 djm 103: { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 },
104: { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL,
1.62 markus 105: KEY_XMSS_CERT, 0, 1, 0 },
106: #endif /* WITH_XMSS */
1.1 djm 107: #ifdef WITH_OPENSSL
1.65 djm 108: { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 },
109: { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 },
110: { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 },
111: { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 },
112: { "ecdsa-sha2-nistp256", "ECDSA", NULL,
113: KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
114: { "ecdsa-sha2-nistp384", "ECDSA", NULL,
115: KEY_ECDSA, NID_secp384r1, 0, 0 },
116: { "ecdsa-sha2-nistp521", "ECDSA", NULL,
117: KEY_ECDSA, NID_secp521r1, 0, 0 },
118: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL,
119: KEY_RSA_CERT, 0, 1, 0 },
120: { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 121: "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 122: { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 123: "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 124: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL,
125: KEY_DSA_CERT, 0, 1, 0 },
126: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 127: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.65 djm 128: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 129: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.65 djm 130: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL,
131: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.1 djm 132: #endif /* WITH_OPENSSL */
1.65 djm 133: { NULL, NULL, NULL, -1, -1, 0, 0 }
1.1 djm 134: };
135:
136: const char *
137: sshkey_type(const struct sshkey *k)
138: {
139: const struct keytype *kt;
140:
141: for (kt = keytypes; kt->type != -1; kt++) {
142: if (kt->type == k->type)
143: return kt->shortname;
144: }
145: return "unknown";
146: }
147:
148: static const char *
149: sshkey_ssh_name_from_type_nid(int type, int nid)
150: {
151: const struct keytype *kt;
152:
153: for (kt = keytypes; kt->type != -1; kt++) {
154: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
155: return kt->name;
156: }
157: return "ssh-unknown";
158: }
159:
160: int
161: sshkey_type_is_cert(int type)
162: {
163: const struct keytype *kt;
164:
165: for (kt = keytypes; kt->type != -1; kt++) {
166: if (kt->type == type)
167: return kt->cert;
168: }
169: return 0;
170: }
171:
172: const char *
173: sshkey_ssh_name(const struct sshkey *k)
174: {
175: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
176: }
177:
178: const char *
179: sshkey_ssh_name_plain(const struct sshkey *k)
180: {
181: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
182: k->ecdsa_nid);
183: }
184:
185: int
186: sshkey_type_from_name(const char *name)
187: {
188: const struct keytype *kt;
189:
190: for (kt = keytypes; kt->type != -1; kt++) {
191: /* Only allow shortname matches for plain key types */
192: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
193: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
194: return kt->type;
195: }
196: return KEY_UNSPEC;
197: }
198:
199: int
200: sshkey_ecdsa_nid_from_name(const char *name)
201: {
202: const struct keytype *kt;
203:
1.4 djm 204: for (kt = keytypes; kt->type != -1; kt++) {
205: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
206: continue;
207: if (kt->name != NULL && strcmp(name, kt->name) == 0)
208: return kt->nid;
209: }
1.1 djm 210: return -1;
211: }
212:
213: char *
1.45 djm 214: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 215: {
216: char *tmp, *ret = NULL;
217: size_t nlen, rlen = 0;
218: const struct keytype *kt;
219:
220: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 221: if (kt->name == NULL)
222: continue;
223: if (!include_sigonly && kt->sigonly)
1.1 djm 224: continue;
225: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
226: continue;
227: if (ret != NULL)
1.38 djm 228: ret[rlen++] = sep;
1.1 djm 229: nlen = strlen(kt->name);
230: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
231: free(ret);
232: return NULL;
233: }
234: ret = tmp;
235: memcpy(ret + rlen, kt->name, nlen + 1);
236: rlen += nlen;
237: }
238: return ret;
239: }
240:
241: int
1.11 djm 242: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 243: {
244: char *s, *cp, *p;
1.11 djm 245: const struct keytype *kt;
246: int type;
1.1 djm 247:
248: if (names == NULL || strcmp(names, "") == 0)
249: return 0;
250: if ((s = cp = strdup(names)) == NULL)
251: return 0;
252: for ((p = strsep(&cp, ",")); p && *p != '\0';
253: (p = strsep(&cp, ","))) {
1.11 djm 254: type = sshkey_type_from_name(p);
255: if (type == KEY_UNSPEC) {
256: if (allow_wildcard) {
257: /*
258: * Try matching key types against the string.
259: * If any has a positive or negative match then
260: * the component is accepted.
261: */
262: for (kt = keytypes; kt->type != -1; kt++) {
263: if (match_pattern_list(kt->name,
1.17 djm 264: p, 0) != 0)
1.11 djm 265: break;
266: }
267: if (kt->type != -1)
268: continue;
269: }
1.1 djm 270: free(s);
271: return 0;
272: }
273: }
274: free(s);
275: return 1;
276: }
277:
278: u_int
279: sshkey_size(const struct sshkey *k)
280: {
1.69 djm 281: #ifdef WITH_OPENSSL
282: const BIGNUM *rsa_n, *dsa_p;
283: #endif /* WITH_OPENSSL */
284:
1.1 djm 285: switch (k->type) {
286: #ifdef WITH_OPENSSL
287: case KEY_RSA:
288: case KEY_RSA_CERT:
1.69 djm 289: if (k->rsa == NULL)
290: return 0;
291: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
292: return BN_num_bits(rsa_n);
1.1 djm 293: case KEY_DSA:
294: case KEY_DSA_CERT:
1.69 djm 295: if (k->dsa == NULL)
296: return 0;
297: DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL);
298: return BN_num_bits(dsa_p);
1.1 djm 299: case KEY_ECDSA:
300: case KEY_ECDSA_CERT:
301: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
302: #endif /* WITH_OPENSSL */
303: case KEY_ED25519:
304: case KEY_ED25519_CERT:
1.62 markus 305: case KEY_XMSS:
306: case KEY_XMSS_CERT:
1.1 djm 307: return 256; /* XXX */
308: }
309: return 0;
310: }
311:
312: static int
313: sshkey_type_is_valid_ca(int type)
314: {
315: switch (type) {
316: case KEY_RSA:
317: case KEY_DSA:
318: case KEY_ECDSA:
319: case KEY_ED25519:
1.62 markus 320: case KEY_XMSS:
1.1 djm 321: return 1;
322: default:
323: return 0;
324: }
325: }
326:
327: int
328: sshkey_is_cert(const struct sshkey *k)
329: {
330: if (k == NULL)
331: return 0;
332: return sshkey_type_is_cert(k->type);
333: }
334:
335: /* Return the cert-less equivalent to a certified key type */
336: int
337: sshkey_type_plain(int type)
338: {
339: switch (type) {
340: case KEY_RSA_CERT:
341: return KEY_RSA;
342: case KEY_DSA_CERT:
343: return KEY_DSA;
344: case KEY_ECDSA_CERT:
345: return KEY_ECDSA;
346: case KEY_ED25519_CERT:
347: return KEY_ED25519;
1.62 markus 348: case KEY_XMSS_CERT:
349: return KEY_XMSS;
1.1 djm 350: default:
351: return type;
352: }
353: }
354:
355: #ifdef WITH_OPENSSL
356: /* XXX: these are really begging for a table-driven approach */
357: int
358: sshkey_curve_name_to_nid(const char *name)
359: {
360: if (strcmp(name, "nistp256") == 0)
361: return NID_X9_62_prime256v1;
362: else if (strcmp(name, "nistp384") == 0)
363: return NID_secp384r1;
364: else if (strcmp(name, "nistp521") == 0)
365: return NID_secp521r1;
366: else
367: return -1;
368: }
369:
370: u_int
371: sshkey_curve_nid_to_bits(int nid)
372: {
373: switch (nid) {
374: case NID_X9_62_prime256v1:
375: return 256;
376: case NID_secp384r1:
377: return 384;
378: case NID_secp521r1:
379: return 521;
380: default:
381: return 0;
382: }
383: }
384:
385: int
386: sshkey_ecdsa_bits_to_nid(int bits)
387: {
388: switch (bits) {
389: case 256:
390: return NID_X9_62_prime256v1;
391: case 384:
392: return NID_secp384r1;
393: case 521:
394: return NID_secp521r1;
395: default:
396: return -1;
397: }
398: }
399:
400: const char *
401: sshkey_curve_nid_to_name(int nid)
402: {
403: switch (nid) {
404: case NID_X9_62_prime256v1:
405: return "nistp256";
406: case NID_secp384r1:
407: return "nistp384";
408: case NID_secp521r1:
409: return "nistp521";
410: default:
411: return NULL;
412: }
413: }
414:
415: int
416: sshkey_ec_nid_to_hash_alg(int nid)
417: {
418: int kbits = sshkey_curve_nid_to_bits(nid);
419:
420: if (kbits <= 0)
421: return -1;
422:
423: /* RFC5656 section 6.2.1 */
424: if (kbits <= 256)
425: return SSH_DIGEST_SHA256;
426: else if (kbits <= 384)
427: return SSH_DIGEST_SHA384;
428: else
429: return SSH_DIGEST_SHA512;
430: }
431: #endif /* WITH_OPENSSL */
432:
433: static void
434: cert_free(struct sshkey_cert *cert)
435: {
436: u_int i;
437:
438: if (cert == NULL)
439: return;
1.31 mmcc 440: sshbuf_free(cert->certblob);
441: sshbuf_free(cert->critical);
442: sshbuf_free(cert->extensions);
1.29 mmcc 443: free(cert->key_id);
1.1 djm 444: for (i = 0; i < cert->nprincipals; i++)
445: free(cert->principals[i]);
1.29 mmcc 446: free(cert->principals);
1.30 mmcc 447: sshkey_free(cert->signature_key);
1.67 djm 448: free(cert->signature_type);
1.61 jsing 449: freezero(cert, sizeof(*cert));
1.1 djm 450: }
451:
452: static struct sshkey_cert *
453: cert_new(void)
454: {
455: struct sshkey_cert *cert;
456:
457: if ((cert = calloc(1, sizeof(*cert))) == NULL)
458: return NULL;
459: if ((cert->certblob = sshbuf_new()) == NULL ||
460: (cert->critical = sshbuf_new()) == NULL ||
461: (cert->extensions = sshbuf_new()) == NULL) {
462: cert_free(cert);
463: return NULL;
464: }
465: cert->key_id = NULL;
466: cert->principals = NULL;
467: cert->signature_key = NULL;
1.67 djm 468: cert->signature_type = NULL;
1.1 djm 469: return cert;
470: }
471:
472: struct sshkey *
473: sshkey_new(int type)
474: {
475: struct sshkey *k;
476: #ifdef WITH_OPENSSL
477: RSA *rsa;
478: DSA *dsa;
479: #endif /* WITH_OPENSSL */
480:
481: if ((k = calloc(1, sizeof(*k))) == NULL)
482: return NULL;
483: k->type = type;
484: k->ecdsa = NULL;
485: k->ecdsa_nid = -1;
486: k->dsa = NULL;
487: k->rsa = NULL;
488: k->cert = NULL;
489: k->ed25519_sk = NULL;
490: k->ed25519_pk = NULL;
1.62 markus 491: k->xmss_sk = NULL;
492: k->xmss_pk = NULL;
1.1 djm 493: switch (k->type) {
494: #ifdef WITH_OPENSSL
495: case KEY_RSA:
496: case KEY_RSA_CERT:
1.69 djm 497: if ((rsa = RSA_new()) == NULL) {
1.1 djm 498: free(k);
499: return NULL;
500: }
501: k->rsa = rsa;
502: break;
503: case KEY_DSA:
504: case KEY_DSA_CERT:
1.69 djm 505: if ((dsa = DSA_new()) == NULL) {
1.1 djm 506: free(k);
507: return NULL;
508: }
509: k->dsa = dsa;
510: break;
511: case KEY_ECDSA:
512: case KEY_ECDSA_CERT:
513: /* Cannot do anything until we know the group */
514: break;
515: #endif /* WITH_OPENSSL */
516: case KEY_ED25519:
517: case KEY_ED25519_CERT:
1.62 markus 518: case KEY_XMSS:
519: case KEY_XMSS_CERT:
1.1 djm 520: /* no need to prealloc */
521: break;
522: case KEY_UNSPEC:
523: break;
524: default:
525: free(k);
526: return NULL;
527: }
528:
529: if (sshkey_is_cert(k)) {
530: if ((k->cert = cert_new()) == NULL) {
531: sshkey_free(k);
532: return NULL;
533: }
534: }
535:
536: return k;
537: }
538:
539: void
540: sshkey_free(struct sshkey *k)
541: {
542: if (k == NULL)
543: return;
544: switch (k->type) {
545: #ifdef WITH_OPENSSL
546: case KEY_RSA:
547: case KEY_RSA_CERT:
1.60 jsing 548: RSA_free(k->rsa);
1.1 djm 549: k->rsa = NULL;
550: break;
551: case KEY_DSA:
552: case KEY_DSA_CERT:
1.60 jsing 553: DSA_free(k->dsa);
1.1 djm 554: k->dsa = NULL;
555: break;
556: case KEY_ECDSA:
557: case KEY_ECDSA_CERT:
1.60 jsing 558: EC_KEY_free(k->ecdsa);
1.1 djm 559: k->ecdsa = NULL;
560: break;
561: #endif /* WITH_OPENSSL */
562: case KEY_ED25519:
563: case KEY_ED25519_CERT:
1.61 jsing 564: freezero(k->ed25519_pk, ED25519_PK_SZ);
565: k->ed25519_pk = NULL;
566: freezero(k->ed25519_sk, ED25519_SK_SZ);
567: k->ed25519_sk = NULL;
1.1 djm 568: break;
1.62 markus 569: #ifdef WITH_XMSS
570: case KEY_XMSS:
571: case KEY_XMSS_CERT:
572: freezero(k->xmss_pk, sshkey_xmss_pklen(k));
573: k->xmss_pk = NULL;
574: freezero(k->xmss_sk, sshkey_xmss_sklen(k));
575: k->xmss_sk = NULL;
576: sshkey_xmss_free_state(k);
577: free(k->xmss_name);
578: k->xmss_name = NULL;
579: free(k->xmss_filename);
580: k->xmss_filename = NULL;
581: break;
582: #endif /* WITH_XMSS */
1.1 djm 583: case KEY_UNSPEC:
584: break;
585: default:
586: break;
587: }
588: if (sshkey_is_cert(k))
589: cert_free(k->cert);
1.76 djm 590: freezero(k->shielded_private, k->shielded_len);
591: freezero(k->shield_prekey, k->shield_prekey_len);
1.61 jsing 592: freezero(k, sizeof(*k));
1.1 djm 593: }
594:
595: static int
596: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
597: {
598: if (a == NULL && b == NULL)
599: return 1;
600: if (a == NULL || b == NULL)
601: return 0;
602: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
603: return 0;
604: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
605: sshbuf_len(a->certblob)) != 0)
606: return 0;
607: return 1;
608: }
609:
610: /*
611: * Compare public portions of key only, allowing comparisons between
612: * certificates and plain keys too.
613: */
614: int
615: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
616: {
617: #ifdef WITH_OPENSSL
618: BN_CTX *bnctx;
1.69 djm 619: const BIGNUM *rsa_e_a, *rsa_n_a;
620: const BIGNUM *rsa_e_b, *rsa_n_b;
621: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
622: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 623: #endif /* WITH_OPENSSL */
624:
625: if (a == NULL || b == NULL ||
626: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
627: return 0;
628:
629: switch (a->type) {
630: #ifdef WITH_OPENSSL
631: case KEY_RSA_CERT:
632: case KEY_RSA:
1.69 djm 633: if (a->rsa == NULL || b->rsa == NULL)
634: return 0;
635: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
636: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
637: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
638: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 639: case KEY_DSA_CERT:
640: case KEY_DSA:
1.69 djm 641: if (a->dsa == NULL || b->dsa == NULL)
642: return 0;
643: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
644: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
645: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
646: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
647: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
648: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
649: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
650: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.1 djm 651: case KEY_ECDSA_CERT:
652: case KEY_ECDSA:
653: if (a->ecdsa == NULL || b->ecdsa == NULL ||
654: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
655: EC_KEY_get0_public_key(b->ecdsa) == NULL)
656: return 0;
657: if ((bnctx = BN_CTX_new()) == NULL)
658: return 0;
659: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
660: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
661: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
662: EC_KEY_get0_public_key(a->ecdsa),
663: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
664: BN_CTX_free(bnctx);
665: return 0;
666: }
667: BN_CTX_free(bnctx);
668: return 1;
669: #endif /* WITH_OPENSSL */
670: case KEY_ED25519:
671: case KEY_ED25519_CERT:
672: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
673: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 674: #ifdef WITH_XMSS
675: case KEY_XMSS:
676: case KEY_XMSS_CERT:
677: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
678: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
679: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
680: #endif /* WITH_XMSS */
1.1 djm 681: default:
682: return 0;
683: }
684: /* NOTREACHED */
685: }
686:
687: int
688: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
689: {
690: if (a == NULL || b == NULL || a->type != b->type)
691: return 0;
692: if (sshkey_is_cert(a)) {
693: if (!cert_compare(a->cert, b->cert))
694: return 0;
695: }
696: return sshkey_equal_public(a, b);
697: }
698:
699: static int
1.62 markus 700: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
701: enum sshkey_serialize_rep opts)
1.1 djm 702: {
703: int type, ret = SSH_ERR_INTERNAL_ERROR;
704: const char *typename;
1.69 djm 705: #ifdef WITH_OPENSSL
706: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
707: #endif /* WITH_OPENSSL */
1.1 djm 708:
709: if (key == NULL)
710: return SSH_ERR_INVALID_ARGUMENT;
711:
1.19 djm 712: if (sshkey_is_cert(key)) {
713: if (key->cert == NULL)
714: return SSH_ERR_EXPECTED_CERT;
715: if (sshbuf_len(key->cert->certblob) == 0)
716: return SSH_ERR_KEY_LACKS_CERTBLOB;
717: }
1.1 djm 718: type = force_plain ? sshkey_type_plain(key->type) : key->type;
719: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
720:
721: switch (type) {
722: #ifdef WITH_OPENSSL
723: case KEY_DSA_CERT:
724: case KEY_ECDSA_CERT:
725: case KEY_RSA_CERT:
726: #endif /* WITH_OPENSSL */
727: case KEY_ED25519_CERT:
1.62 markus 728: #ifdef WITH_XMSS
729: case KEY_XMSS_CERT:
730: #endif /* WITH_XMSS */
1.1 djm 731: /* Use the existing blob */
732: /* XXX modified flag? */
733: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
734: return ret;
735: break;
736: #ifdef WITH_OPENSSL
737: case KEY_DSA:
738: if (key->dsa == NULL)
739: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 740: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
741: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 742: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 743: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
744: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
745: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
746: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 747: return ret;
748: break;
749: case KEY_ECDSA:
750: if (key->ecdsa == NULL)
751: return SSH_ERR_INVALID_ARGUMENT;
752: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
753: (ret = sshbuf_put_cstring(b,
754: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
755: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
756: return ret;
757: break;
758: case KEY_RSA:
759: if (key->rsa == NULL)
760: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 761: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 762: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 763: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
764: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 765: return ret;
766: break;
767: #endif /* WITH_OPENSSL */
768: case KEY_ED25519:
769: if (key->ed25519_pk == NULL)
770: return SSH_ERR_INVALID_ARGUMENT;
771: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
772: (ret = sshbuf_put_string(b,
773: key->ed25519_pk, ED25519_PK_SZ)) != 0)
774: return ret;
775: break;
1.62 markus 776: #ifdef WITH_XMSS
777: case KEY_XMSS:
778: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
779: sshkey_xmss_pklen(key) == 0)
780: return SSH_ERR_INVALID_ARGUMENT;
781: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
782: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
783: (ret = sshbuf_put_string(b,
784: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
785: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
786: return ret;
787: break;
788: #endif /* WITH_XMSS */
1.1 djm 789: default:
790: return SSH_ERR_KEY_TYPE_UNKNOWN;
791: }
792: return 0;
793: }
794:
795: int
1.14 djm 796: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 797: {
1.62 markus 798: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 799: }
800:
801: int
1.62 markus 802: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
803: enum sshkey_serialize_rep opts)
1.14 djm 804: {
805: struct sshbuf *tmp;
806: int r;
807:
808: if ((tmp = sshbuf_new()) == NULL)
809: return SSH_ERR_ALLOC_FAIL;
1.62 markus 810: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 811: if (r == 0)
812: r = sshbuf_put_stringb(b, tmp);
813: sshbuf_free(tmp);
814: return r;
815: }
816:
817: int
1.62 markus 818: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
819: {
820: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
821: }
822:
823: int
1.14 djm 824: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 825: {
1.62 markus 826: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 827: }
828:
829: static int
1.62 markus 830: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
831: enum sshkey_serialize_rep opts)
1.1 djm 832: {
833: int ret = SSH_ERR_INTERNAL_ERROR;
834: size_t len;
835: struct sshbuf *b = NULL;
836:
837: if (lenp != NULL)
838: *lenp = 0;
839: if (blobp != NULL)
840: *blobp = NULL;
841: if ((b = sshbuf_new()) == NULL)
842: return SSH_ERR_ALLOC_FAIL;
1.62 markus 843: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 844: goto out;
845: len = sshbuf_len(b);
846: if (lenp != NULL)
847: *lenp = len;
848: if (blobp != NULL) {
849: if ((*blobp = malloc(len)) == NULL) {
850: ret = SSH_ERR_ALLOC_FAIL;
851: goto out;
852: }
853: memcpy(*blobp, sshbuf_ptr(b), len);
854: }
855: ret = 0;
856: out:
857: sshbuf_free(b);
858: return ret;
859: }
860:
861: int
862: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
863: {
1.62 markus 864: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 865: }
866:
867: int
868: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
869: {
1.62 markus 870: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 871: }
872:
873: int
1.7 djm 874: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 875: u_char **retp, size_t *lenp)
876: {
877: u_char *blob = NULL, *ret = NULL;
878: size_t blob_len = 0;
1.7 djm 879: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 880:
881: if (retp != NULL)
882: *retp = NULL;
883: if (lenp != NULL)
884: *lenp = 0;
1.7 djm 885: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 886: r = SSH_ERR_INVALID_ARGUMENT;
887: goto out;
888: }
1.62 markus 889: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
890: != 0)
1.1 djm 891: goto out;
892: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
893: r = SSH_ERR_ALLOC_FAIL;
894: goto out;
895: }
1.7 djm 896: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 897: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
898: goto out;
899: /* success */
900: if (retp != NULL) {
901: *retp = ret;
902: ret = NULL;
903: }
904: if (lenp != NULL)
1.7 djm 905: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 906: r = 0;
907: out:
908: free(ret);
909: if (blob != NULL) {
910: explicit_bzero(blob, blob_len);
911: free(blob);
912: }
913: return r;
914: }
915:
916: static char *
1.7 djm 917: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
918: {
919: char *ret;
920: size_t plen = strlen(alg) + 1;
921: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
922:
923: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
924: return NULL;
925: strlcpy(ret, alg, rlen);
926: strlcat(ret, ":", rlen);
927: if (dgst_raw_len == 0)
928: return ret;
1.79 dtucker 929: if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
1.61 jsing 930: freezero(ret, rlen);
1.7 djm 931: return NULL;
932: }
933: /* Trim padding characters from end */
934: ret[strcspn(ret, "=")] = '\0';
935: return ret;
936: }
937:
938: static char *
939: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 940: {
1.7 djm 941: char *retval, hex[5];
942: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 943:
1.7 djm 944: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 945: return NULL;
1.7 djm 946: strlcpy(retval, alg, rlen);
947: strlcat(retval, ":", rlen);
1.1 djm 948: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 949: snprintf(hex, sizeof(hex), "%s%02x",
950: i > 0 ? ":" : "", dgst_raw[i]);
951: strlcat(retval, hex, rlen);
1.1 djm 952: }
953: return retval;
954: }
955:
956: static char *
957: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
958: {
959: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
960: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
961: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
962: u_int i, j = 0, rounds, seed = 1;
963: char *retval;
964:
965: rounds = (dgst_raw_len / 2) + 1;
966: if ((retval = calloc(rounds, 6)) == NULL)
967: return NULL;
968: retval[j++] = 'x';
969: for (i = 0; i < rounds; i++) {
970: u_int idx0, idx1, idx2, idx3, idx4;
971: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
972: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
973: seed) % 6;
974: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
975: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
976: (seed / 6)) % 6;
977: retval[j++] = vowels[idx0];
978: retval[j++] = consonants[idx1];
979: retval[j++] = vowels[idx2];
980: if ((i + 1) < rounds) {
981: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
982: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
983: retval[j++] = consonants[idx3];
984: retval[j++] = '-';
985: retval[j++] = consonants[idx4];
986: seed = ((seed * 5) +
987: ((((u_int)(dgst_raw[2 * i])) * 7) +
988: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
989: }
990: } else {
991: idx0 = seed % 6;
992: idx1 = 16;
993: idx2 = seed / 6;
994: retval[j++] = vowels[idx0];
995: retval[j++] = consonants[idx1];
996: retval[j++] = vowels[idx2];
997: }
998: }
999: retval[j++] = 'x';
1000: retval[j++] = '\0';
1001: return retval;
1002: }
1003:
1004: /*
1005: * Draw an ASCII-Art representing the fingerprint so human brain can
1006: * profit from its built-in pattern recognition ability.
1007: * This technique is called "random art" and can be found in some
1008: * scientific publications like this original paper:
1009: *
1010: * "Hash Visualization: a New Technique to improve Real-World Security",
1011: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1012: * Techniques and E-Commerce (CrypTEC '99)
1013: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1014: *
1015: * The subject came up in a talk by Dan Kaminsky, too.
1016: *
1017: * If you see the picture is different, the key is different.
1018: * If the picture looks the same, you still know nothing.
1019: *
1020: * The algorithm used here is a worm crawling over a discrete plane,
1021: * leaving a trace (augmenting the field) everywhere it goes.
1022: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1023: * makes the respective movement vector be ignored for this turn.
1024: * Graphs are not unambiguous, because circles in graphs can be
1025: * walked in either direction.
1026: */
1027:
1028: /*
1029: * Field sizes for the random art. Have to be odd, so the starting point
1030: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1031: * Else pictures would be too dense, and drawing the frame would
1032: * fail, too, because the key type would not fit in anymore.
1033: */
1034: #define FLDBASE 8
1035: #define FLDSIZE_Y (FLDBASE + 1)
1036: #define FLDSIZE_X (FLDBASE * 2 + 1)
1037: static char *
1.7 djm 1038: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1039: const struct sshkey *k)
1040: {
1041: /*
1042: * Chars to be used after each other every time the worm
1043: * intersects with itself. Matter of taste.
1044: */
1045: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1046: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1047: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1048: size_t i, tlen, hlen;
1.1 djm 1049: u_int b;
1.3 djm 1050: int x, y, r;
1.1 djm 1051: size_t len = strlen(augmentation_string) - 1;
1052:
1053: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1054: return NULL;
1055:
1056: /* initialize field */
1057: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1058: x = FLDSIZE_X / 2;
1059: y = FLDSIZE_Y / 2;
1060:
1061: /* process raw key */
1062: for (i = 0; i < dgst_raw_len; i++) {
1063: int input;
1064: /* each byte conveys four 2-bit move commands */
1065: input = dgst_raw[i];
1066: for (b = 0; b < 4; b++) {
1067: /* evaluate 2 bit, rest is shifted later */
1068: x += (input & 0x1) ? 1 : -1;
1069: y += (input & 0x2) ? 1 : -1;
1070:
1071: /* assure we are still in bounds */
1.37 deraadt 1072: x = MAXIMUM(x, 0);
1073: y = MAXIMUM(y, 0);
1074: x = MINIMUM(x, FLDSIZE_X - 1);
1075: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1076:
1077: /* augment the field */
1078: if (field[x][y] < len - 2)
1079: field[x][y]++;
1080: input = input >> 2;
1081: }
1082: }
1083:
1084: /* mark starting point and end point*/
1085: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1086: field[x][y] = len;
1087:
1.3 djm 1088: /* assemble title */
1089: r = snprintf(title, sizeof(title), "[%s %u]",
1090: sshkey_type(k), sshkey_size(k));
1091: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1092: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1093: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1094: tlen = (r <= 0) ? 0 : strlen(title);
1095:
1096: /* assemble hash ID. */
1097: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1098: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1099:
1100: /* output upper border */
1.3 djm 1101: p = retval;
1102: *p++ = '+';
1103: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1104: *p++ = '-';
1105: memcpy(p, title, tlen);
1106: p += tlen;
1.7 djm 1107: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1108: *p++ = '-';
1109: *p++ = '+';
1110: *p++ = '\n';
1111:
1112: /* output content */
1113: for (y = 0; y < FLDSIZE_Y; y++) {
1114: *p++ = '|';
1115: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1116: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1117: *p++ = '|';
1118: *p++ = '\n';
1119: }
1120:
1121: /* output lower border */
1122: *p++ = '+';
1.7 djm 1123: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1124: *p++ = '-';
1125: memcpy(p, hash, hlen);
1126: p += hlen;
1127: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1128: *p++ = '-';
1129: *p++ = '+';
1130:
1131: return retval;
1132: }
1133:
1134: char *
1.7 djm 1135: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1136: enum sshkey_fp_rep dgst_rep)
1137: {
1138: char *retval = NULL;
1139: u_char *dgst_raw;
1140: size_t dgst_raw_len;
1141:
1.7 djm 1142: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1143: return NULL;
1144: switch (dgst_rep) {
1.7 djm 1145: case SSH_FP_DEFAULT:
1146: if (dgst_alg == SSH_DIGEST_MD5) {
1147: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1148: dgst_raw, dgst_raw_len);
1149: } else {
1150: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1151: dgst_raw, dgst_raw_len);
1152: }
1153: break;
1.1 djm 1154: case SSH_FP_HEX:
1.7 djm 1155: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1156: dgst_raw, dgst_raw_len);
1157: break;
1158: case SSH_FP_BASE64:
1159: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1160: dgst_raw, dgst_raw_len);
1.1 djm 1161: break;
1162: case SSH_FP_BUBBLEBABBLE:
1163: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1164: break;
1165: case SSH_FP_RANDOMART:
1.7 djm 1166: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1167: dgst_raw, dgst_raw_len, k);
1.1 djm 1168: break;
1169: default:
1170: explicit_bzero(dgst_raw, dgst_raw_len);
1171: free(dgst_raw);
1172: return NULL;
1173: }
1174: explicit_bzero(dgst_raw, dgst_raw_len);
1175: free(dgst_raw);
1176: return retval;
1177: }
1178:
1.63 djm 1179: static int
1180: peek_type_nid(const char *s, size_t l, int *nid)
1181: {
1182: const struct keytype *kt;
1183:
1184: for (kt = keytypes; kt->type != -1; kt++) {
1185: if (kt->name == NULL || strlen(kt->name) != l)
1186: continue;
1187: if (memcmp(s, kt->name, l) == 0) {
1188: *nid = -1;
1189: if (kt->type == KEY_ECDSA || kt->type == KEY_ECDSA_CERT)
1190: *nid = kt->nid;
1191: return kt->type;
1192: }
1193: }
1194: return KEY_UNSPEC;
1195: }
1196:
1.1 djm 1197:
1.63 djm 1198: /* XXX this can now be made const char * */
1.1 djm 1199: int
1200: sshkey_read(struct sshkey *ret, char **cpp)
1201: {
1202: struct sshkey *k;
1.63 djm 1203: char *cp, *blobcopy;
1204: size_t space;
1.1 djm 1205: int r, type, curve_nid = -1;
1206: struct sshbuf *blob;
1.44 dtucker 1207:
1208: if (ret == NULL)
1209: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1210:
1211: switch (ret->type) {
1212: case KEY_UNSPEC:
1213: case KEY_RSA:
1214: case KEY_DSA:
1215: case KEY_ECDSA:
1216: case KEY_ED25519:
1217: case KEY_DSA_CERT:
1218: case KEY_ECDSA_CERT:
1219: case KEY_RSA_CERT:
1220: case KEY_ED25519_CERT:
1.62 markus 1221: #ifdef WITH_XMSS
1222: case KEY_XMSS:
1223: case KEY_XMSS_CERT:
1224: #endif /* WITH_XMSS */
1.63 djm 1225: break; /* ok */
1226: default:
1227: return SSH_ERR_INVALID_ARGUMENT;
1228: }
1229:
1230: /* Decode type */
1231: cp = *cpp;
1232: space = strcspn(cp, " \t");
1233: if (space == strlen(cp))
1234: return SSH_ERR_INVALID_FORMAT;
1235: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1236: return SSH_ERR_INVALID_FORMAT;
1237:
1238: /* skip whitespace */
1239: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1240: ;
1241: if (*cp == '\0')
1242: return SSH_ERR_INVALID_FORMAT;
1243: if (ret->type != KEY_UNSPEC && ret->type != type)
1244: return SSH_ERR_KEY_TYPE_MISMATCH;
1245: if ((blob = sshbuf_new()) == NULL)
1246: return SSH_ERR_ALLOC_FAIL;
1247:
1248: /* find end of keyblob and decode */
1249: space = strcspn(cp, " \t");
1250: if ((blobcopy = strndup(cp, space)) == NULL) {
1251: sshbuf_free(blob);
1252: return SSH_ERR_ALLOC_FAIL;
1253: }
1254: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1255: free(blobcopy);
1256: sshbuf_free(blob);
1257: return r;
1258: }
1259: free(blobcopy);
1260: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1261: sshbuf_free(blob);
1.63 djm 1262: return r;
1263: }
1264: sshbuf_free(blob);
1265:
1266: /* skip whitespace and leave cp at start of comment */
1267: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1268: ;
1269:
1270: /* ensure type of blob matches type at start of line */
1271: if (k->type != type) {
1272: sshkey_free(k);
1273: return SSH_ERR_KEY_TYPE_MISMATCH;
1274: }
1275: if (sshkey_type_plain(type) == KEY_ECDSA && curve_nid != k->ecdsa_nid) {
1276: sshkey_free(k);
1277: return SSH_ERR_EC_CURVE_MISMATCH;
1278: }
1279:
1280: /* Fill in ret from parsed key */
1281: ret->type = type;
1282: if (sshkey_is_cert(ret)) {
1283: if (!sshkey_is_cert(k)) {
1.1 djm 1284: sshkey_free(k);
1.63 djm 1285: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1286: }
1.63 djm 1287: if (ret->cert != NULL)
1288: cert_free(ret->cert);
1289: ret->cert = k->cert;
1290: k->cert = NULL;
1291: }
1292: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1293: #ifdef WITH_OPENSSL
1.63 djm 1294: case KEY_RSA:
1295: RSA_free(ret->rsa);
1296: ret->rsa = k->rsa;
1297: k->rsa = NULL;
1.1 djm 1298: #ifdef DEBUG_PK
1.63 djm 1299: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1300: #endif
1.63 djm 1301: break;
1302: case KEY_DSA:
1303: DSA_free(ret->dsa);
1304: ret->dsa = k->dsa;
1305: k->dsa = NULL;
1.1 djm 1306: #ifdef DEBUG_PK
1.63 djm 1307: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1308: #endif
1.63 djm 1309: break;
1310: case KEY_ECDSA:
1311: EC_KEY_free(ret->ecdsa);
1312: ret->ecdsa = k->ecdsa;
1313: ret->ecdsa_nid = k->ecdsa_nid;
1314: k->ecdsa = NULL;
1315: k->ecdsa_nid = -1;
1.1 djm 1316: #ifdef DEBUG_PK
1.63 djm 1317: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1318: #endif
1.63 djm 1319: break;
1.1 djm 1320: #endif /* WITH_OPENSSL */
1.63 djm 1321: case KEY_ED25519:
1322: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1323: ret->ed25519_pk = k->ed25519_pk;
1324: k->ed25519_pk = NULL;
1.1 djm 1325: #ifdef DEBUG_PK
1.63 djm 1326: /* XXX */
1.1 djm 1327: #endif
1.63 djm 1328: break;
1.62 markus 1329: #ifdef WITH_XMSS
1.63 djm 1330: case KEY_XMSS:
1331: free(ret->xmss_pk);
1332: ret->xmss_pk = k->xmss_pk;
1333: k->xmss_pk = NULL;
1334: free(ret->xmss_state);
1335: ret->xmss_state = k->xmss_state;
1336: k->xmss_state = NULL;
1337: free(ret->xmss_name);
1338: ret->xmss_name = k->xmss_name;
1339: k->xmss_name = NULL;
1340: free(ret->xmss_filename);
1341: ret->xmss_filename = k->xmss_filename;
1342: k->xmss_filename = NULL;
1.62 markus 1343: #ifdef DEBUG_PK
1.63 djm 1344: /* XXX */
1.62 markus 1345: #endif
1.63 djm 1346: break;
1.62 markus 1347: #endif /* WITH_XMSS */
1.63 djm 1348: default:
1.1 djm 1349: sshkey_free(k);
1.63 djm 1350: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1351: }
1.63 djm 1352: sshkey_free(k);
1353:
1354: /* success */
1355: *cpp = cp;
1356: return 0;
1.1 djm 1357: }
1358:
1359: int
1.19 djm 1360: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1361: {
1.19 djm 1362: int r = SSH_ERR_INTERNAL_ERROR;
1363: struct sshbuf *b = NULL;
1.1 djm 1364: char *uu = NULL;
1.19 djm 1365:
1366: if (b64p != NULL)
1367: *b64p = NULL;
1368: if ((b = sshbuf_new()) == NULL)
1369: return SSH_ERR_ALLOC_FAIL;
1370: if ((r = sshkey_putb(key, b)) != 0)
1371: goto out;
1.81 djm 1372: if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
1.19 djm 1373: r = SSH_ERR_ALLOC_FAIL;
1374: goto out;
1375: }
1376: /* Success */
1377: if (b64p != NULL) {
1378: *b64p = uu;
1379: uu = NULL;
1380: }
1381: r = 0;
1382: out:
1383: sshbuf_free(b);
1384: free(uu);
1385: return r;
1386: }
1387:
1.52 djm 1388: int
1.19 djm 1389: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1390: {
1391: int r = SSH_ERR_INTERNAL_ERROR;
1392: char *uu = NULL;
1393:
1.48 djm 1394: if ((r = sshkey_to_base64(key, &uu)) != 0)
1395: goto out;
1396: if ((r = sshbuf_putf(b, "%s %s",
1397: sshkey_ssh_name(key), uu)) != 0)
1398: goto out;
1.19 djm 1399: r = 0;
1400: out:
1401: free(uu);
1402: return r;
1403: }
1404:
1405: int
1406: sshkey_write(const struct sshkey *key, FILE *f)
1407: {
1408: struct sshbuf *b = NULL;
1409: int r = SSH_ERR_INTERNAL_ERROR;
1410:
1411: if ((b = sshbuf_new()) == NULL)
1412: return SSH_ERR_ALLOC_FAIL;
1413: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1414: goto out;
1415: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1416: if (feof(f))
1417: errno = EPIPE;
1.19 djm 1418: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1419: goto out;
1420: }
1.19 djm 1421: /* Success */
1422: r = 0;
1.1 djm 1423: out:
1.19 djm 1424: sshbuf_free(b);
1425: return r;
1.1 djm 1426: }
1427:
1428: const char *
1429: sshkey_cert_type(const struct sshkey *k)
1430: {
1431: switch (k->cert->type) {
1432: case SSH2_CERT_TYPE_USER:
1433: return "user";
1434: case SSH2_CERT_TYPE_HOST:
1435: return "host";
1436: default:
1437: return "unknown";
1438: }
1439: }
1440:
1441: #ifdef WITH_OPENSSL
1442: static int
1443: rsa_generate_private_key(u_int bits, RSA **rsap)
1444: {
1445: RSA *private = NULL;
1446: BIGNUM *f4 = NULL;
1447: int ret = SSH_ERR_INTERNAL_ERROR;
1448:
1.49 djm 1449: if (rsap == NULL)
1450: return SSH_ERR_INVALID_ARGUMENT;
1451: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1452: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1453: return SSH_ERR_KEY_LENGTH;
1.1 djm 1454: *rsap = NULL;
1455: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1456: ret = SSH_ERR_ALLOC_FAIL;
1457: goto out;
1458: }
1459: if (!BN_set_word(f4, RSA_F4) ||
1460: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1461: ret = SSH_ERR_LIBCRYPTO_ERROR;
1462: goto out;
1463: }
1464: *rsap = private;
1465: private = NULL;
1466: ret = 0;
1467: out:
1.60 jsing 1468: RSA_free(private);
1469: BN_free(f4);
1.1 djm 1470: return ret;
1471: }
1472:
1473: static int
1474: dsa_generate_private_key(u_int bits, DSA **dsap)
1475: {
1476: DSA *private;
1477: int ret = SSH_ERR_INTERNAL_ERROR;
1478:
1.49 djm 1479: if (dsap == NULL)
1.1 djm 1480: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1481: if (bits != 1024)
1482: return SSH_ERR_KEY_LENGTH;
1.1 djm 1483: if ((private = DSA_new()) == NULL) {
1484: ret = SSH_ERR_ALLOC_FAIL;
1485: goto out;
1486: }
1487: *dsap = NULL;
1488: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1489: NULL, NULL) || !DSA_generate_key(private)) {
1490: ret = SSH_ERR_LIBCRYPTO_ERROR;
1491: goto out;
1492: }
1493: *dsap = private;
1494: private = NULL;
1495: ret = 0;
1496: out:
1.60 jsing 1497: DSA_free(private);
1.1 djm 1498: return ret;
1499: }
1500:
1501: int
1502: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1503: {
1504: EC_GROUP *eg;
1505: int nids[] = {
1506: NID_X9_62_prime256v1,
1507: NID_secp384r1,
1508: NID_secp521r1,
1509: -1
1510: };
1511: int nid;
1512: u_int i;
1513: BN_CTX *bnctx;
1514: const EC_GROUP *g = EC_KEY_get0_group(k);
1515:
1516: /*
1517: * The group may be stored in a ASN.1 encoded private key in one of two
1518: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1519: * or explicit group parameters encoded into the key blob. Only the
1520: * "named group" case sets the group NID for us, but we can figure
1521: * it out for the other case by comparing against all the groups that
1522: * are supported.
1523: */
1524: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1525: return nid;
1526: if ((bnctx = BN_CTX_new()) == NULL)
1527: return -1;
1528: for (i = 0; nids[i] != -1; i++) {
1529: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1530: BN_CTX_free(bnctx);
1531: return -1;
1532: }
1533: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1534: break;
1535: EC_GROUP_free(eg);
1536: }
1537: BN_CTX_free(bnctx);
1538: if (nids[i] != -1) {
1539: /* Use the group with the NID attached */
1540: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1541: if (EC_KEY_set_group(k, eg) != 1) {
1542: EC_GROUP_free(eg);
1543: return -1;
1544: }
1545: }
1546: return nids[i];
1547: }
1548:
1549: static int
1550: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1551: {
1552: EC_KEY *private;
1553: int ret = SSH_ERR_INTERNAL_ERROR;
1554:
1.50 djm 1555: if (nid == NULL || ecdsap == NULL)
1.1 djm 1556: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1557: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1558: return SSH_ERR_KEY_LENGTH;
1.1 djm 1559: *ecdsap = NULL;
1560: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1561: ret = SSH_ERR_ALLOC_FAIL;
1562: goto out;
1563: }
1564: if (EC_KEY_generate_key(private) != 1) {
1565: ret = SSH_ERR_LIBCRYPTO_ERROR;
1566: goto out;
1567: }
1568: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1569: *ecdsap = private;
1570: private = NULL;
1571: ret = 0;
1572: out:
1.60 jsing 1573: EC_KEY_free(private);
1.1 djm 1574: return ret;
1575: }
1576: #endif /* WITH_OPENSSL */
1577:
1578: int
1579: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1580: {
1581: struct sshkey *k;
1582: int ret = SSH_ERR_INTERNAL_ERROR;
1583:
1584: if (keyp == NULL)
1585: return SSH_ERR_INVALID_ARGUMENT;
1586: *keyp = NULL;
1587: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1588: return SSH_ERR_ALLOC_FAIL;
1589: switch (type) {
1590: case KEY_ED25519:
1591: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1592: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1593: ret = SSH_ERR_ALLOC_FAIL;
1594: break;
1595: }
1596: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1597: ret = 0;
1598: break;
1.62 markus 1599: #ifdef WITH_XMSS
1600: case KEY_XMSS:
1601: ret = sshkey_xmss_generate_private_key(k, bits);
1602: break;
1603: #endif /* WITH_XMSS */
1.1 djm 1604: #ifdef WITH_OPENSSL
1605: case KEY_DSA:
1606: ret = dsa_generate_private_key(bits, &k->dsa);
1607: break;
1608: case KEY_ECDSA:
1609: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1610: &k->ecdsa);
1611: break;
1612: case KEY_RSA:
1613: ret = rsa_generate_private_key(bits, &k->rsa);
1614: break;
1615: #endif /* WITH_OPENSSL */
1616: default:
1617: ret = SSH_ERR_INVALID_ARGUMENT;
1618: }
1619: if (ret == 0) {
1620: k->type = type;
1621: *keyp = k;
1622: } else
1623: sshkey_free(k);
1624: return ret;
1625: }
1626:
1627: int
1628: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1629: {
1630: u_int i;
1631: const struct sshkey_cert *from;
1632: struct sshkey_cert *to;
1.67 djm 1633: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1634:
1.67 djm 1635: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1636: return SSH_ERR_INVALID_ARGUMENT;
1637:
1.67 djm 1638: if ((to = cert_new()) == NULL)
1.1 djm 1639: return SSH_ERR_ALLOC_FAIL;
1640:
1.67 djm 1641: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1642: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1643: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1644: goto out;
1.1 djm 1645:
1646: to->serial = from->serial;
1647: to->type = from->type;
1648: if (from->key_id == NULL)
1649: to->key_id = NULL;
1.67 djm 1650: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1651: r = SSH_ERR_ALLOC_FAIL;
1652: goto out;
1653: }
1.1 djm 1654: to->valid_after = from->valid_after;
1655: to->valid_before = from->valid_before;
1656: if (from->signature_key == NULL)
1657: to->signature_key = NULL;
1.67 djm 1658: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1659: &to->signature_key)) != 0)
1.67 djm 1660: goto out;
1661: if (from->signature_type != NULL &&
1662: (to->signature_type = strdup(from->signature_type)) == NULL) {
1663: r = SSH_ERR_ALLOC_FAIL;
1664: goto out;
1665: }
1666: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1667: r = SSH_ERR_INVALID_ARGUMENT;
1668: goto out;
1669: }
1.1 djm 1670: if (from->nprincipals > 0) {
1671: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1672: sizeof(*to->principals))) == NULL) {
1673: r = SSH_ERR_ALLOC_FAIL;
1674: goto out;
1675: }
1.1 djm 1676: for (i = 0; i < from->nprincipals; i++) {
1677: to->principals[i] = strdup(from->principals[i]);
1678: if (to->principals[i] == NULL) {
1679: to->nprincipals = i;
1.67 djm 1680: r = SSH_ERR_ALLOC_FAIL;
1681: goto out;
1.1 djm 1682: }
1683: }
1684: }
1685: to->nprincipals = from->nprincipals;
1.67 djm 1686:
1687: /* success */
1688: cert_free(to_key->cert);
1689: to_key->cert = to;
1690: to = NULL;
1691: r = 0;
1692: out:
1693: cert_free(to);
1694: return r;
1.1 djm 1695: }
1696:
1697: int
1698: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1699: {
1700: struct sshkey *n = NULL;
1.69 djm 1701: int r = SSH_ERR_INTERNAL_ERROR;
1702: #ifdef WITH_OPENSSL
1703: const BIGNUM *rsa_n, *rsa_e;
1704: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1705: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1706: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1707: BIGNUM *dsa_pub_key_dup = NULL;
1708: #endif /* WITH_OPENSSL */
1.1 djm 1709:
1.24 djm 1710: *pkp = NULL;
1.1 djm 1711: switch (k->type) {
1712: #ifdef WITH_OPENSSL
1713: case KEY_DSA:
1714: case KEY_DSA_CERT:
1.69 djm 1715: if ((n = sshkey_new(k->type)) == NULL) {
1716: r = SSH_ERR_ALLOC_FAIL;
1717: goto out;
1718: }
1719:
1720: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1721: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1722: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1723: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1724: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1725: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1726: r = SSH_ERR_ALLOC_FAIL;
1727: goto out;
1728: }
1729: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1730: r = SSH_ERR_LIBCRYPTO_ERROR;
1731: goto out;
1.1 djm 1732: }
1.69 djm 1733: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1734: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1735: r = SSH_ERR_LIBCRYPTO_ERROR;
1736: goto out;
1737: }
1738: dsa_pub_key_dup = NULL; /* transferred */
1739:
1.1 djm 1740: break;
1741: case KEY_ECDSA:
1742: case KEY_ECDSA_CERT:
1.69 djm 1743: if ((n = sshkey_new(k->type)) == NULL) {
1744: r = SSH_ERR_ALLOC_FAIL;
1745: goto out;
1746: }
1.1 djm 1747: n->ecdsa_nid = k->ecdsa_nid;
1748: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1749: if (n->ecdsa == NULL) {
1.69 djm 1750: r = SSH_ERR_ALLOC_FAIL;
1751: goto out;
1.1 djm 1752: }
1753: if (EC_KEY_set_public_key(n->ecdsa,
1754: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1755: r = SSH_ERR_LIBCRYPTO_ERROR;
1756: goto out;
1.1 djm 1757: }
1758: break;
1759: case KEY_RSA:
1760: case KEY_RSA_CERT:
1.69 djm 1761: if ((n = sshkey_new(k->type)) == NULL) {
1762: r = SSH_ERR_ALLOC_FAIL;
1763: goto out;
1.1 djm 1764: }
1.69 djm 1765: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1766: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1767: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1768: r = SSH_ERR_ALLOC_FAIL;
1769: goto out;
1770: }
1771: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1772: r = SSH_ERR_LIBCRYPTO_ERROR;
1773: goto out;
1774: }
1775: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1776: break;
1777: #endif /* WITH_OPENSSL */
1778: case KEY_ED25519:
1779: case KEY_ED25519_CERT:
1.69 djm 1780: if ((n = sshkey_new(k->type)) == NULL) {
1781: r = SSH_ERR_ALLOC_FAIL;
1782: goto out;
1783: }
1.1 djm 1784: if (k->ed25519_pk != NULL) {
1785: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1786: r = SSH_ERR_ALLOC_FAIL;
1787: goto out;
1.1 djm 1788: }
1789: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1790: }
1791: break;
1.62 markus 1792: #ifdef WITH_XMSS
1793: case KEY_XMSS:
1794: case KEY_XMSS_CERT:
1.69 djm 1795: if ((n = sshkey_new(k->type)) == NULL) {
1796: r = SSH_ERR_ALLOC_FAIL;
1797: goto out;
1.62 markus 1798: }
1.69 djm 1799: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1800: goto out;
1.62 markus 1801: if (k->xmss_pk != NULL) {
1802: size_t pklen = sshkey_xmss_pklen(k);
1803: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1804: r = SSH_ERR_INTERNAL_ERROR;
1805: goto out;
1.62 markus 1806: }
1807: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1808: r = SSH_ERR_ALLOC_FAIL;
1809: goto out;
1.62 markus 1810: }
1811: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1812: }
1813: break;
1814: #endif /* WITH_XMSS */
1.1 djm 1815: default:
1.69 djm 1816: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1817: goto out;
1.1 djm 1818: }
1.69 djm 1819: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1820: goto out;
1821: /* success */
1.1 djm 1822: *pkp = n;
1.69 djm 1823: n = NULL;
1824: r = 0;
1825: out:
1826: sshkey_free(n);
1827: BN_clear_free(rsa_n_dup);
1828: BN_clear_free(rsa_e_dup);
1829: BN_clear_free(dsa_p_dup);
1830: BN_clear_free(dsa_q_dup);
1831: BN_clear_free(dsa_g_dup);
1832: BN_clear_free(dsa_pub_key_dup);
1833:
1834: return r;
1.1 djm 1835: }
1836:
1.76 djm 1837: int
1838: sshkey_is_shielded(struct sshkey *k)
1839: {
1840: return k != NULL && k->shielded_private != NULL;
1841: }
1842:
1843: int
1844: sshkey_shield_private(struct sshkey *k)
1845: {
1846: struct sshbuf *prvbuf = NULL;
1847: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1848: struct sshcipher_ctx *cctx = NULL;
1849: const struct sshcipher *cipher;
1850: size_t i, enclen = 0;
1851: struct sshkey *kswap = NULL, tmp;
1852: int r = SSH_ERR_INTERNAL_ERROR;
1853:
1854: #ifdef DEBUG_PK
1855: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1856: #endif
1857: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1858: r = SSH_ERR_INVALID_ARGUMENT;
1859: goto out;
1860: }
1861: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1862: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1863: r = SSH_ERR_INTERNAL_ERROR;
1864: goto out;
1865: }
1866:
1867: /* Prepare a random pre-key, and from it an ephemeral key */
1868: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1869: r = SSH_ERR_ALLOC_FAIL;
1870: goto out;
1871: }
1872: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1873: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1874: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1875: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1876: goto out;
1877: #ifdef DEBUG_PK
1878: fprintf(stderr, "%s: key+iv\n", __func__);
1879: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1880: stderr);
1881: #endif
1882: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1883: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1884: goto out;
1885:
1886: /* Serialise and encrypt the private key using the ephemeral key */
1887: if ((prvbuf = sshbuf_new()) == NULL) {
1888: r = SSH_ERR_ALLOC_FAIL;
1889: goto out;
1890: }
1891: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1892: goto out;
1893: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1894: SSHKEY_SERIALIZE_FULL)) != 0)
1895: goto out;
1896: /* pad to cipher blocksize */
1897: i = 0;
1898: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1899: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1900: goto out;
1901: }
1902: #ifdef DEBUG_PK
1903: fprintf(stderr, "%s: serialised\n", __func__);
1904: sshbuf_dump(prvbuf, stderr);
1905: #endif
1906: /* encrypt */
1907: enclen = sshbuf_len(prvbuf);
1908: if ((enc = malloc(enclen)) == NULL) {
1909: r = SSH_ERR_ALLOC_FAIL;
1910: goto out;
1911: }
1912: if ((r = cipher_crypt(cctx, 0, enc,
1913: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1914: goto out;
1915: #ifdef DEBUG_PK
1916: fprintf(stderr, "%s: encrypted\n", __func__);
1917: sshbuf_dump_data(enc, enclen, stderr);
1918: #endif
1919:
1920: /* Make a scrubbed, public-only copy of our private key argument */
1921: if ((r = sshkey_from_private(k, &kswap)) != 0)
1922: goto out;
1923:
1924: /* Swap the private key out (it will be destroyed below) */
1925: tmp = *kswap;
1926: *kswap = *k;
1927: *k = tmp;
1928:
1929: /* Insert the shielded key into our argument */
1930: k->shielded_private = enc;
1931: k->shielded_len = enclen;
1932: k->shield_prekey = prekey;
1933: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1934: enc = prekey = NULL; /* transferred */
1935: enclen = 0;
1936:
1937: /* success */
1938: r = 0;
1939:
1940: out:
1941: /* XXX behaviour on error - invalidate original private key? */
1942: cipher_free(cctx);
1943: explicit_bzero(keyiv, sizeof(keyiv));
1944: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1945: freezero(enc, enclen);
1.76 djm 1946: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1947: sshkey_free(kswap);
1948: sshbuf_free(prvbuf);
1949: return r;
1950: }
1951:
1952: int
1953: sshkey_unshield_private(struct sshkey *k)
1954: {
1955: struct sshbuf *prvbuf = NULL;
1956: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1957: struct sshcipher_ctx *cctx = NULL;
1958: const struct sshcipher *cipher;
1959: size_t i;
1960: struct sshkey *kswap = NULL, tmp;
1961: int r = SSH_ERR_INTERNAL_ERROR;
1962:
1963: #ifdef DEBUG_PK
1964: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1965: #endif
1966: if (!sshkey_is_shielded(k))
1967: return 0; /* nothing to do */
1968:
1969: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1970: r = SSH_ERR_INVALID_ARGUMENT;
1971: goto out;
1972: }
1973: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1974: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1975: r = SSH_ERR_INTERNAL_ERROR;
1976: goto out;
1977: }
1978: /* check size of shielded key blob */
1979: if (k->shielded_len < cipher_blocksize(cipher) ||
1980: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1981: r = SSH_ERR_INVALID_FORMAT;
1982: goto out;
1983: }
1984:
1985: /* Calculate the ephemeral key from the prekey */
1986: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1987: k->shield_prekey, k->shield_prekey_len,
1988: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1989: goto out;
1990: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1991: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1992: goto out;
1993: #ifdef DEBUG_PK
1994: fprintf(stderr, "%s: key+iv\n", __func__);
1995: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1996: stderr);
1997: #endif
1998:
1999: /* Decrypt and parse the shielded private key using the ephemeral key */
2000: if ((prvbuf = sshbuf_new()) == NULL) {
2001: r = SSH_ERR_ALLOC_FAIL;
2002: goto out;
2003: }
2004: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2005: goto out;
2006: /* decrypt */
2007: #ifdef DEBUG_PK
2008: fprintf(stderr, "%s: encrypted\n", __func__);
2009: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2010: #endif
2011: if ((r = cipher_crypt(cctx, 0, cp,
2012: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2013: goto out;
2014: #ifdef DEBUG_PK
2015: fprintf(stderr, "%s: serialised\n", __func__);
2016: sshbuf_dump(prvbuf, stderr);
2017: #endif
2018: /* Parse private key */
2019: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2020: goto out;
2021: /* Check deterministic padding */
2022: i = 0;
2023: while (sshbuf_len(prvbuf)) {
2024: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2025: goto out;
2026: if (pad != (++i & 0xff)) {
2027: r = SSH_ERR_INVALID_FORMAT;
2028: goto out;
2029: }
2030: }
2031:
2032: /* Swap the parsed key back into place */
2033: tmp = *kswap;
2034: *kswap = *k;
2035: *k = tmp;
2036:
2037: /* success */
2038: r = 0;
2039:
2040: out:
2041: cipher_free(cctx);
2042: explicit_bzero(keyiv, sizeof(keyiv));
2043: explicit_bzero(&tmp, sizeof(tmp));
2044: sshkey_free(kswap);
2045: sshbuf_free(prvbuf);
2046: return r;
2047: }
2048:
1.1 djm 2049: static int
1.14 djm 2050: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2051: {
1.14 djm 2052: struct sshbuf *principals = NULL, *crit = NULL;
2053: struct sshbuf *exts = NULL, *ca = NULL;
2054: u_char *sig = NULL;
2055: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2056: int ret = SSH_ERR_INTERNAL_ERROR;
2057:
2058: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2059: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2060: return ret;
2061:
1.20 djm 2062: /* Parse body of certificate up to signature */
2063: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2064: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2065: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2066: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2067: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2068: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2069: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2070: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2071: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2072: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2073: /* XXX debug print error for ret */
2074: ret = SSH_ERR_INVALID_FORMAT;
2075: goto out;
2076: }
2077:
2078: /* Signature is left in the buffer so we can calculate this length */
2079: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2080:
2081: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2082: ret = SSH_ERR_INVALID_FORMAT;
2083: goto out;
2084: }
2085:
2086: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2087: key->cert->type != SSH2_CERT_TYPE_HOST) {
2088: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2089: goto out;
2090: }
2091:
1.4 djm 2092: /* Parse principals section */
2093: while (sshbuf_len(principals) > 0) {
2094: char *principal = NULL;
2095: char **oprincipals = NULL;
2096:
1.1 djm 2097: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2098: ret = SSH_ERR_INVALID_FORMAT;
2099: goto out;
2100: }
1.4 djm 2101: if ((ret = sshbuf_get_cstring(principals, &principal,
2102: NULL)) != 0) {
1.1 djm 2103: ret = SSH_ERR_INVALID_FORMAT;
2104: goto out;
2105: }
2106: oprincipals = key->cert->principals;
1.51 deraadt 2107: key->cert->principals = recallocarray(key->cert->principals,
2108: key->cert->nprincipals, key->cert->nprincipals + 1,
2109: sizeof(*key->cert->principals));
1.1 djm 2110: if (key->cert->principals == NULL) {
2111: free(principal);
2112: key->cert->principals = oprincipals;
2113: ret = SSH_ERR_ALLOC_FAIL;
2114: goto out;
2115: }
2116: key->cert->principals[key->cert->nprincipals++] = principal;
2117: }
2118:
1.4 djm 2119: /*
2120: * Stash a copies of the critical options and extensions sections
2121: * for later use.
2122: */
2123: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2124: (exts != NULL &&
2125: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2126: goto out;
2127:
1.4 djm 2128: /*
2129: * Validate critical options and extensions sections format.
2130: */
2131: while (sshbuf_len(crit) != 0) {
2132: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2133: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2134: sshbuf_reset(key->cert->critical);
1.1 djm 2135: ret = SSH_ERR_INVALID_FORMAT;
2136: goto out;
2137: }
2138: }
1.4 djm 2139: while (exts != NULL && sshbuf_len(exts) != 0) {
2140: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2141: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2142: sshbuf_reset(key->cert->extensions);
1.1 djm 2143: ret = SSH_ERR_INVALID_FORMAT;
2144: goto out;
2145: }
2146: }
2147:
1.4 djm 2148: /* Parse CA key and check signature */
1.14 djm 2149: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2150: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2151: goto out;
2152: }
2153: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2154: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2155: goto out;
2156: }
2157: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 2158: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 2159: goto out;
1.82 ! djm 2160: if ((ret = sshkey_get_sigtype(sig, slen,
! 2161: &key->cert->signature_type)) != 0)
1.67 djm 2162: goto out;
1.4 djm 2163:
2164: /* Success */
1.1 djm 2165: ret = 0;
2166: out:
1.14 djm 2167: sshbuf_free(ca);
1.4 djm 2168: sshbuf_free(crit);
2169: sshbuf_free(exts);
2170: sshbuf_free(principals);
1.1 djm 2171: free(sig);
2172: return ret;
2173: }
2174:
2175: static int
1.69 djm 2176: check_rsa_length(const RSA *rsa)
2177: {
2178: const BIGNUM *rsa_n;
2179:
2180: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2181: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2182: return SSH_ERR_KEY_LENGTH;
2183: return 0;
2184: }
2185:
2186: static int
1.14 djm 2187: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2188: int allow_cert)
1.1 djm 2189: {
1.12 djm 2190: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2191: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2192: struct sshkey *key = NULL;
2193: size_t len;
2194: u_char *pk = NULL;
1.14 djm 2195: struct sshbuf *copy;
1.1 djm 2196: #ifdef WITH_OPENSSL
2197: EC_POINT *q = NULL;
1.69 djm 2198: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2199: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2200: #endif /* WITH_OPENSSL */
2201:
2202: #ifdef DEBUG_PK /* XXX */
1.14 djm 2203: sshbuf_dump(b, stderr);
1.1 djm 2204: #endif
1.32 djm 2205: if (keyp != NULL)
2206: *keyp = NULL;
1.14 djm 2207: if ((copy = sshbuf_fromb(b)) == NULL) {
2208: ret = SSH_ERR_ALLOC_FAIL;
2209: goto out;
2210: }
1.1 djm 2211: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2212: ret = SSH_ERR_INVALID_FORMAT;
2213: goto out;
2214: }
2215:
2216: type = sshkey_type_from_name(ktype);
2217: if (!allow_cert && sshkey_type_is_cert(type)) {
2218: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2219: goto out;
2220: }
2221: switch (type) {
2222: #ifdef WITH_OPENSSL
2223: case KEY_RSA_CERT:
1.14 djm 2224: /* Skip nonce */
1.1 djm 2225: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2226: ret = SSH_ERR_INVALID_FORMAT;
2227: goto out;
2228: }
2229: /* FALLTHROUGH */
2230: case KEY_RSA:
2231: if ((key = sshkey_new(type)) == NULL) {
2232: ret = SSH_ERR_ALLOC_FAIL;
2233: goto out;
2234: }
1.73 djm 2235: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2236: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2237: ret = SSH_ERR_INVALID_FORMAT;
2238: goto out;
2239: }
1.69 djm 2240: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2241: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2242: goto out;
2243: }
1.69 djm 2244: rsa_n = rsa_e = NULL; /* transferred */
2245: if ((ret = check_rsa_length(key->rsa)) != 0)
2246: goto out;
1.1 djm 2247: #ifdef DEBUG_PK
2248: RSA_print_fp(stderr, key->rsa, 8);
2249: #endif
2250: break;
2251: case KEY_DSA_CERT:
1.14 djm 2252: /* Skip nonce */
1.1 djm 2253: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2254: ret = SSH_ERR_INVALID_FORMAT;
2255: goto out;
2256: }
2257: /* FALLTHROUGH */
2258: case KEY_DSA:
2259: if ((key = sshkey_new(type)) == NULL) {
2260: ret = SSH_ERR_ALLOC_FAIL;
2261: goto out;
2262: }
1.73 djm 2263: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2264: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2265: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2266: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2267: ret = SSH_ERR_INVALID_FORMAT;
2268: goto out;
2269: }
1.69 djm 2270: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2271: ret = SSH_ERR_LIBCRYPTO_ERROR;
2272: goto out;
2273: }
2274: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2275: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2276: ret = SSH_ERR_LIBCRYPTO_ERROR;
2277: goto out;
2278: }
2279: dsa_pub_key = NULL; /* transferred */
1.1 djm 2280: #ifdef DEBUG_PK
2281: DSA_print_fp(stderr, key->dsa, 8);
2282: #endif
2283: break;
2284: case KEY_ECDSA_CERT:
1.14 djm 2285: /* Skip nonce */
1.1 djm 2286: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2287: ret = SSH_ERR_INVALID_FORMAT;
2288: goto out;
2289: }
2290: /* FALLTHROUGH */
2291: case KEY_ECDSA:
2292: if ((key = sshkey_new(type)) == NULL) {
2293: ret = SSH_ERR_ALLOC_FAIL;
2294: goto out;
2295: }
1.12 djm 2296: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2297: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2298: ret = SSH_ERR_INVALID_FORMAT;
2299: goto out;
2300: }
2301: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2302: ret = SSH_ERR_EC_CURVE_MISMATCH;
2303: goto out;
2304: }
1.60 jsing 2305: EC_KEY_free(key->ecdsa);
1.1 djm 2306: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2307: == NULL) {
2308: ret = SSH_ERR_EC_CURVE_INVALID;
2309: goto out;
2310: }
2311: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2312: ret = SSH_ERR_ALLOC_FAIL;
2313: goto out;
2314: }
2315: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2316: ret = SSH_ERR_INVALID_FORMAT;
2317: goto out;
2318: }
2319: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2320: q) != 0) {
2321: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2322: goto out;
2323: }
2324: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2325: /* XXX assume it is a allocation error */
2326: ret = SSH_ERR_ALLOC_FAIL;
2327: goto out;
2328: }
2329: #ifdef DEBUG_PK
2330: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2331: #endif
2332: break;
2333: #endif /* WITH_OPENSSL */
2334: case KEY_ED25519_CERT:
1.14 djm 2335: /* Skip nonce */
1.1 djm 2336: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2337: ret = SSH_ERR_INVALID_FORMAT;
2338: goto out;
2339: }
2340: /* FALLTHROUGH */
2341: case KEY_ED25519:
2342: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2343: goto out;
2344: if (len != ED25519_PK_SZ) {
2345: ret = SSH_ERR_INVALID_FORMAT;
2346: goto out;
2347: }
2348: if ((key = sshkey_new(type)) == NULL) {
2349: ret = SSH_ERR_ALLOC_FAIL;
2350: goto out;
2351: }
2352: key->ed25519_pk = pk;
2353: pk = NULL;
2354: break;
1.62 markus 2355: #ifdef WITH_XMSS
2356: case KEY_XMSS_CERT:
2357: /* Skip nonce */
2358: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2359: ret = SSH_ERR_INVALID_FORMAT;
2360: goto out;
2361: }
2362: /* FALLTHROUGH */
2363: case KEY_XMSS:
2364: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2365: goto out;
2366: if ((key = sshkey_new(type)) == NULL) {
2367: ret = SSH_ERR_ALLOC_FAIL;
2368: goto out;
2369: }
2370: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2371: goto out;
2372: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2373: goto out;
2374: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2375: ret = SSH_ERR_INVALID_FORMAT;
2376: goto out;
2377: }
2378: key->xmss_pk = pk;
2379: pk = NULL;
2380: if (type != KEY_XMSS_CERT &&
2381: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2382: goto out;
2383: break;
2384: #endif /* WITH_XMSS */
1.1 djm 2385: case KEY_UNSPEC:
2386: default:
2387: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2388: goto out;
2389: }
2390:
2391: /* Parse certificate potion */
1.14 djm 2392: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2393: goto out;
2394:
2395: if (key != NULL && sshbuf_len(b) != 0) {
2396: ret = SSH_ERR_INVALID_FORMAT;
2397: goto out;
2398: }
2399: ret = 0;
1.32 djm 2400: if (keyp != NULL) {
2401: *keyp = key;
2402: key = NULL;
2403: }
1.1 djm 2404: out:
1.14 djm 2405: sshbuf_free(copy);
1.1 djm 2406: sshkey_free(key);
1.62 markus 2407: free(xmss_name);
1.1 djm 2408: free(ktype);
2409: free(curve);
2410: free(pk);
2411: #ifdef WITH_OPENSSL
1.60 jsing 2412: EC_POINT_free(q);
1.69 djm 2413: BN_clear_free(rsa_n);
2414: BN_clear_free(rsa_e);
2415: BN_clear_free(dsa_p);
2416: BN_clear_free(dsa_q);
2417: BN_clear_free(dsa_g);
2418: BN_clear_free(dsa_pub_key);
1.1 djm 2419: #endif /* WITH_OPENSSL */
2420: return ret;
2421: }
2422:
2423: int
2424: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2425: {
1.14 djm 2426: struct sshbuf *b;
2427: int r;
2428:
2429: if ((b = sshbuf_from(blob, blen)) == NULL)
2430: return SSH_ERR_ALLOC_FAIL;
2431: r = sshkey_from_blob_internal(b, keyp, 1);
2432: sshbuf_free(b);
2433: return r;
2434: }
2435:
2436: int
2437: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2438: {
2439: return sshkey_from_blob_internal(b, keyp, 1);
2440: }
2441:
2442: int
2443: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2444: {
2445: struct sshbuf *b;
2446: int r;
2447:
2448: if ((r = sshbuf_froms(buf, &b)) != 0)
2449: return r;
2450: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2451: sshbuf_free(b);
2452: return r;
2453: }
2454:
1.82 ! djm 2455: int
! 2456: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2457: {
2458: int r;
2459: struct sshbuf *b = NULL;
2460: char *sigtype = NULL;
2461:
2462: if (sigtypep != NULL)
2463: *sigtypep = NULL;
2464: if ((b = sshbuf_from(sig, siglen)) == NULL)
2465: return SSH_ERR_ALLOC_FAIL;
2466: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2467: goto out;
2468: /* success */
2469: if (sigtypep != NULL) {
2470: *sigtypep = sigtype;
2471: sigtype = NULL;
2472: }
2473: r = 0;
2474: out:
2475: free(sigtype);
1.14 djm 2476: sshbuf_free(b);
2477: return r;
1.68 djm 2478: }
2479:
2480: /*
2481: *
2482: * Checks whether a certificate's signature type is allowed.
2483: * Returns 0 (success) if the certificate signature type appears in the
2484: * "allowed" pattern-list, or the key is not a certificate to begin with.
2485: * Otherwise returns a ssherr.h code.
2486: */
2487: int
2488: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2489: {
2490: if (key == NULL || allowed == NULL)
2491: return SSH_ERR_INVALID_ARGUMENT;
2492: if (!sshkey_type_is_cert(key->type))
2493: return 0;
2494: if (key->cert == NULL || key->cert->signature_type == NULL)
2495: return SSH_ERR_INVALID_ARGUMENT;
2496: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2497: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2498: return 0;
1.65 djm 2499: }
2500:
2501: /*
2502: * Returns the expected signature algorithm for a given public key algorithm.
2503: */
1.66 djm 2504: const char *
2505: sshkey_sigalg_by_name(const char *name)
1.65 djm 2506: {
2507: const struct keytype *kt;
2508:
2509: for (kt = keytypes; kt->type != -1; kt++) {
2510: if (strcmp(kt->name, name) != 0)
2511: continue;
2512: if (kt->sigalg != NULL)
2513: return kt->sigalg;
2514: if (!kt->cert)
2515: return kt->name;
2516: return sshkey_ssh_name_from_type_nid(
2517: sshkey_type_plain(kt->type), kt->nid);
2518: }
2519: return NULL;
2520: }
2521:
2522: /*
2523: * Verifies that the signature algorithm appearing inside the signature blob
2524: * matches that which was requested.
2525: */
2526: int
2527: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2528: const char *requested_alg)
2529: {
2530: const char *expected_alg;
2531: char *sigtype = NULL;
2532: int r;
2533:
2534: if (requested_alg == NULL)
2535: return 0;
1.66 djm 2536: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2537: return SSH_ERR_INVALID_ARGUMENT;
1.82 ! djm 2538: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2539: return r;
2540: r = strcmp(expected_alg, sigtype) == 0;
2541: free(sigtype);
2542: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2543: }
2544:
2545: int
1.76 djm 2546: sshkey_sign(struct sshkey *key,
1.1 djm 2547: u_char **sigp, size_t *lenp,
1.28 markus 2548: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2549: {
1.76 djm 2550: int was_shielded = sshkey_is_shielded(key);
2551: int r2, r = SSH_ERR_INTERNAL_ERROR;
2552:
1.1 djm 2553: if (sigp != NULL)
2554: *sigp = NULL;
2555: if (lenp != NULL)
2556: *lenp = 0;
2557: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2558: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2559: if ((r = sshkey_unshield_private(key)) != 0)
2560: return r;
1.1 djm 2561: switch (key->type) {
2562: #ifdef WITH_OPENSSL
2563: case KEY_DSA_CERT:
2564: case KEY_DSA:
1.76 djm 2565: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2566: break;
1.1 djm 2567: case KEY_ECDSA_CERT:
2568: case KEY_ECDSA:
1.76 djm 2569: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2570: break;
1.1 djm 2571: case KEY_RSA_CERT:
2572: case KEY_RSA:
1.76 djm 2573: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2574: break;
1.1 djm 2575: #endif /* WITH_OPENSSL */
2576: case KEY_ED25519:
2577: case KEY_ED25519_CERT:
1.76 djm 2578: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2579: break;
1.62 markus 2580: #ifdef WITH_XMSS
2581: case KEY_XMSS:
2582: case KEY_XMSS_CERT:
1.76 djm 2583: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2584: break;
1.62 markus 2585: #endif /* WITH_XMSS */
1.1 djm 2586: default:
1.76 djm 2587: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2588: break;
1.1 djm 2589: }
1.76 djm 2590: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2591: return r2;
2592: return r;
1.1 djm 2593: }
2594:
2595: /*
2596: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2597: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2598: */
2599: int
2600: sshkey_verify(const struct sshkey *key,
2601: const u_char *sig, size_t siglen,
1.59 djm 2602: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2603: {
1.6 djm 2604: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2605: return SSH_ERR_INVALID_ARGUMENT;
2606: switch (key->type) {
2607: #ifdef WITH_OPENSSL
2608: case KEY_DSA_CERT:
2609: case KEY_DSA:
2610: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2611: case KEY_ECDSA_CERT:
2612: case KEY_ECDSA:
2613: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2614: case KEY_RSA_CERT:
2615: case KEY_RSA:
1.59 djm 2616: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2617: #endif /* WITH_OPENSSL */
2618: case KEY_ED25519:
2619: case KEY_ED25519_CERT:
2620: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.62 markus 2621: #ifdef WITH_XMSS
2622: case KEY_XMSS:
2623: case KEY_XMSS_CERT:
2624: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2625: #endif /* WITH_XMSS */
1.1 djm 2626: default:
2627: return SSH_ERR_KEY_TYPE_UNKNOWN;
2628: }
2629: }
2630:
2631: /* Convert a plain key to their _CERT equivalent */
2632: int
1.20 djm 2633: sshkey_to_certified(struct sshkey *k)
1.1 djm 2634: {
2635: int newtype;
2636:
2637: switch (k->type) {
2638: #ifdef WITH_OPENSSL
2639: case KEY_RSA:
1.20 djm 2640: newtype = KEY_RSA_CERT;
1.1 djm 2641: break;
2642: case KEY_DSA:
1.20 djm 2643: newtype = KEY_DSA_CERT;
1.1 djm 2644: break;
2645: case KEY_ECDSA:
2646: newtype = KEY_ECDSA_CERT;
2647: break;
2648: #endif /* WITH_OPENSSL */
2649: case KEY_ED25519:
2650: newtype = KEY_ED25519_CERT;
2651: break;
1.62 markus 2652: #ifdef WITH_XMSS
2653: case KEY_XMSS:
2654: newtype = KEY_XMSS_CERT;
2655: break;
2656: #endif /* WITH_XMSS */
1.1 djm 2657: default:
2658: return SSH_ERR_INVALID_ARGUMENT;
2659: }
2660: if ((k->cert = cert_new()) == NULL)
2661: return SSH_ERR_ALLOC_FAIL;
2662: k->type = newtype;
2663: return 0;
2664: }
2665:
2666: /* Convert a certificate to its raw key equivalent */
2667: int
2668: sshkey_drop_cert(struct sshkey *k)
2669: {
2670: if (!sshkey_type_is_cert(k->type))
2671: return SSH_ERR_KEY_TYPE_UNKNOWN;
2672: cert_free(k->cert);
2673: k->cert = NULL;
2674: k->type = sshkey_type_plain(k->type);
2675: return 0;
2676: }
2677:
2678: /* Sign a certified key, (re-)generating the signed certblob. */
2679: int
1.53 djm 2680: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2681: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2682: {
2683: struct sshbuf *principals = NULL;
2684: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2685: size_t i, ca_len, sig_len;
2686: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2687: struct sshbuf *cert = NULL;
2688: char *sigtype = NULL;
1.69 djm 2689: #ifdef WITH_OPENSSL
2690: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2691: #endif /* WITH_OPENSSL */
1.1 djm 2692:
2693: if (k == NULL || k->cert == NULL ||
2694: k->cert->certblob == NULL || ca == NULL)
2695: return SSH_ERR_INVALID_ARGUMENT;
2696: if (!sshkey_is_cert(k))
2697: return SSH_ERR_KEY_TYPE_UNKNOWN;
2698: if (!sshkey_type_is_valid_ca(ca->type))
2699: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2700:
1.67 djm 2701: /*
2702: * If no alg specified as argument but a signature_type was set,
2703: * then prefer that. If both were specified, then they must match.
2704: */
2705: if (alg == NULL)
2706: alg = k->cert->signature_type;
2707: else if (k->cert->signature_type != NULL &&
2708: strcmp(alg, k->cert->signature_type) != 0)
2709: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2710:
2711: /*
2712: * If no signing algorithm or signature_type was specified and we're
2713: * using a RSA key, then default to a good signature algorithm.
2714: */
2715: if (alg == NULL && ca->type == KEY_RSA)
2716: alg = "rsa-sha2-512";
1.67 djm 2717:
1.1 djm 2718: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2719: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2720:
2721: cert = k->cert->certblob; /* for readability */
2722: sshbuf_reset(cert);
2723: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2724: goto out;
2725:
2726: /* -v01 certs put nonce first */
2727: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2728: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2729: goto out;
1.1 djm 2730:
2731: /* XXX this substantially duplicates to_blob(); refactor */
2732: switch (k->type) {
2733: #ifdef WITH_OPENSSL
2734: case KEY_DSA_CERT:
1.69 djm 2735: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2736: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2737: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2738: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2739: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2740: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2741: goto out;
2742: break;
2743: case KEY_ECDSA_CERT:
2744: if ((ret = sshbuf_put_cstring(cert,
2745: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2746: (ret = sshbuf_put_ec(cert,
2747: EC_KEY_get0_public_key(k->ecdsa),
2748: EC_KEY_get0_group(k->ecdsa))) != 0)
2749: goto out;
2750: break;
2751: case KEY_RSA_CERT:
1.69 djm 2752: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2753: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2754: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2755: goto out;
2756: break;
2757: #endif /* WITH_OPENSSL */
2758: case KEY_ED25519_CERT:
2759: if ((ret = sshbuf_put_string(cert,
2760: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2761: goto out;
2762: break;
1.62 markus 2763: #ifdef WITH_XMSS
2764: case KEY_XMSS_CERT:
2765: if (k->xmss_name == NULL) {
2766: ret = SSH_ERR_INVALID_ARGUMENT;
2767: goto out;
2768: }
2769: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2770: (ret = sshbuf_put_string(cert,
2771: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2772: goto out;
2773: break;
2774: #endif /* WITH_XMSS */
1.1 djm 2775: default:
2776: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2777: goto out;
1.1 djm 2778: }
2779:
1.20 djm 2780: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2781: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2782: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2783: goto out;
2784:
2785: if ((principals = sshbuf_new()) == NULL) {
2786: ret = SSH_ERR_ALLOC_FAIL;
2787: goto out;
2788: }
2789: for (i = 0; i < k->cert->nprincipals; i++) {
2790: if ((ret = sshbuf_put_cstring(principals,
2791: k->cert->principals[i])) != 0)
2792: goto out;
2793: }
2794: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2795: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2796: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2797: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2798: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2799: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2800: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2801: goto out;
2802:
2803: /* Sign the whole mess */
1.53 djm 2804: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2805: sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
1.1 djm 2806: goto out;
1.67 djm 2807: /* Check and update signature_type against what was actually used */
1.82 ! djm 2808: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2809: goto out;
2810: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2811: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2812: goto out;
2813: }
2814: if (k->cert->signature_type == NULL) {
2815: k->cert->signature_type = sigtype;
2816: sigtype = NULL;
2817: }
1.1 djm 2818: /* Append signature and we are done */
2819: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2820: goto out;
2821: ret = 0;
2822: out:
2823: if (ret != 0)
2824: sshbuf_reset(cert);
1.29 mmcc 2825: free(sig_blob);
2826: free(ca_blob);
1.67 djm 2827: free(sigtype);
1.31 mmcc 2828: sshbuf_free(principals);
1.1 djm 2829: return ret;
1.53 djm 2830: }
2831:
2832: static int
1.76 djm 2833: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2834: const u_char *data, size_t datalen,
2835: const char *alg, u_int compat, void *ctx)
2836: {
2837: if (ctx != NULL)
2838: return SSH_ERR_INVALID_ARGUMENT;
2839: return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2840: }
2841:
2842: int
2843: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2844: {
2845: return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
1.1 djm 2846: }
2847:
2848: int
2849: sshkey_cert_check_authority(const struct sshkey *k,
2850: int want_host, int require_principal,
2851: const char *name, const char **reason)
2852: {
2853: u_int i, principal_matches;
2854: time_t now = time(NULL);
2855:
2856: if (reason != NULL)
2857: *reason = NULL;
2858:
2859: if (want_host) {
2860: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2861: *reason = "Certificate invalid: not a host certificate";
2862: return SSH_ERR_KEY_CERT_INVALID;
2863: }
2864: } else {
2865: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2866: *reason = "Certificate invalid: not a user certificate";
2867: return SSH_ERR_KEY_CERT_INVALID;
2868: }
2869: }
2870: if (now < 0) {
2871: /* yikes - system clock before epoch! */
2872: *reason = "Certificate invalid: not yet valid";
2873: return SSH_ERR_KEY_CERT_INVALID;
2874: }
2875: if ((u_int64_t)now < k->cert->valid_after) {
2876: *reason = "Certificate invalid: not yet valid";
2877: return SSH_ERR_KEY_CERT_INVALID;
2878: }
2879: if ((u_int64_t)now >= k->cert->valid_before) {
2880: *reason = "Certificate invalid: expired";
2881: return SSH_ERR_KEY_CERT_INVALID;
2882: }
2883: if (k->cert->nprincipals == 0) {
2884: if (require_principal) {
2885: *reason = "Certificate lacks principal list";
2886: return SSH_ERR_KEY_CERT_INVALID;
2887: }
2888: } else if (name != NULL) {
2889: principal_matches = 0;
2890: for (i = 0; i < k->cert->nprincipals; i++) {
2891: if (strcmp(name, k->cert->principals[i]) == 0) {
2892: principal_matches = 1;
2893: break;
2894: }
2895: }
2896: if (!principal_matches) {
2897: *reason = "Certificate invalid: name is not a listed "
2898: "principal";
2899: return SSH_ERR_KEY_CERT_INVALID;
2900: }
2901: }
2902: return 0;
1.27 djm 2903: }
2904:
2905: size_t
2906: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2907: {
2908: char from[32], to[32], ret[64];
2909: time_t tt;
2910: struct tm *tm;
2911:
2912: *from = *to = '\0';
2913: if (cert->valid_after == 0 &&
2914: cert->valid_before == 0xffffffffffffffffULL)
2915: return strlcpy(s, "forever", l);
2916:
2917: if (cert->valid_after != 0) {
2918: /* XXX revisit INT_MAX in 2038 :) */
2919: tt = cert->valid_after > INT_MAX ?
2920: INT_MAX : cert->valid_after;
2921: tm = localtime(&tt);
2922: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2923: }
2924: if (cert->valid_before != 0xffffffffffffffffULL) {
2925: /* XXX revisit INT_MAX in 2038 :) */
2926: tt = cert->valid_before > INT_MAX ?
2927: INT_MAX : cert->valid_before;
2928: tm = localtime(&tt);
2929: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2930: }
2931:
2932: if (cert->valid_after == 0)
2933: snprintf(ret, sizeof(ret), "before %s", to);
2934: else if (cert->valid_before == 0xffffffffffffffffULL)
2935: snprintf(ret, sizeof(ret), "after %s", from);
2936: else
2937: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2938:
2939: return strlcpy(s, ret, l);
1.1 djm 2940: }
2941:
2942: int
1.76 djm 2943: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2944: enum sshkey_serialize_rep opts)
1.1 djm 2945: {
2946: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2947: int was_shielded = sshkey_is_shielded(key);
2948: struct sshbuf *b = NULL;
1.69 djm 2949: #ifdef WITH_OPENSSL
2950: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2951: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2952: #endif /* WITH_OPENSSL */
1.1 djm 2953:
1.76 djm 2954: if ((r = sshkey_unshield_private(key)) != 0)
2955: return r;
2956: if ((b = sshbuf_new()) == NULL)
2957: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2958: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2959: goto out;
2960: switch (key->type) {
2961: #ifdef WITH_OPENSSL
2962: case KEY_RSA:
1.69 djm 2963: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2964: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2965: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2966: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2967: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2968: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2969: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2970: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2971: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2972: goto out;
2973: break;
2974: case KEY_RSA_CERT:
2975: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2976: r = SSH_ERR_INVALID_ARGUMENT;
2977: goto out;
2978: }
1.69 djm 2979: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2980: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2981: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2982: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2983: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2984: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2985: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2986: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2987: goto out;
2988: break;
2989: case KEY_DSA:
1.69 djm 2990: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2991: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2992: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2993: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2994: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2995: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2996: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2997: goto out;
2998: break;
2999: case KEY_DSA_CERT:
3000: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3001: r = SSH_ERR_INVALID_ARGUMENT;
3002: goto out;
3003: }
1.69 djm 3004: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3005: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3006: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3007: goto out;
3008: break;
3009: case KEY_ECDSA:
3010: if ((r = sshbuf_put_cstring(b,
3011: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3012: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3013: (r = sshbuf_put_bignum2(b,
3014: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3015: goto out;
3016: break;
3017: case KEY_ECDSA_CERT:
3018: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3019: r = SSH_ERR_INVALID_ARGUMENT;
3020: goto out;
3021: }
3022: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3023: (r = sshbuf_put_bignum2(b,
3024: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3025: goto out;
3026: break;
3027: #endif /* WITH_OPENSSL */
3028: case KEY_ED25519:
3029: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3030: ED25519_PK_SZ)) != 0 ||
3031: (r = sshbuf_put_string(b, key->ed25519_sk,
3032: ED25519_SK_SZ)) != 0)
3033: goto out;
3034: break;
3035: case KEY_ED25519_CERT:
3036: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3037: r = SSH_ERR_INVALID_ARGUMENT;
3038: goto out;
3039: }
3040: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3041: (r = sshbuf_put_string(b, key->ed25519_pk,
3042: ED25519_PK_SZ)) != 0 ||
3043: (r = sshbuf_put_string(b, key->ed25519_sk,
3044: ED25519_SK_SZ)) != 0)
3045: goto out;
3046: break;
1.62 markus 3047: #ifdef WITH_XMSS
3048: case KEY_XMSS:
3049: if (key->xmss_name == NULL) {
3050: r = SSH_ERR_INVALID_ARGUMENT;
3051: goto out;
3052: }
3053: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3054: (r = sshbuf_put_string(b, key->xmss_pk,
3055: sshkey_xmss_pklen(key))) != 0 ||
3056: (r = sshbuf_put_string(b, key->xmss_sk,
3057: sshkey_xmss_sklen(key))) != 0 ||
3058: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3059: goto out;
3060: break;
3061: case KEY_XMSS_CERT:
3062: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3063: key->xmss_name == NULL) {
3064: r = SSH_ERR_INVALID_ARGUMENT;
3065: goto out;
3066: }
3067: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3068: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3069: (r = sshbuf_put_string(b, key->xmss_pk,
3070: sshkey_xmss_pklen(key))) != 0 ||
3071: (r = sshbuf_put_string(b, key->xmss_sk,
3072: sshkey_xmss_sklen(key))) != 0 ||
3073: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3074: goto out;
3075: break;
3076: #endif /* WITH_XMSS */
1.1 djm 3077: default:
3078: r = SSH_ERR_INVALID_ARGUMENT;
3079: goto out;
3080: }
1.76 djm 3081: /*
3082: * success (but we still need to append the output to buf after
3083: * possibly re-shielding the private key)
3084: */
1.1 djm 3085: r = 0;
3086: out:
1.76 djm 3087: if (was_shielded)
3088: r = sshkey_shield_private(key);
3089: if (r == 0)
3090: r = sshbuf_putb(buf, b);
3091: sshbuf_free(b);
3092:
1.1 djm 3093: return r;
3094: }
3095:
3096: int
1.76 djm 3097: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3098: {
3099: return sshkey_private_serialize_opt(key, b,
3100: SSHKEY_SERIALIZE_DEFAULT);
3101: }
3102:
3103: int
1.1 djm 3104: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3105: {
1.62 markus 3106: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3107: struct sshkey *k = NULL;
1.14 djm 3108: size_t pklen = 0, sklen = 0;
1.1 djm 3109: int type, r = SSH_ERR_INTERNAL_ERROR;
3110: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3111: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3112: #ifdef WITH_OPENSSL
3113: BIGNUM *exponent = NULL;
1.69 djm 3114: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3115: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3116: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3117: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3118: #endif /* WITH_OPENSSL */
3119:
3120: if (kp != NULL)
3121: *kp = NULL;
3122: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3123: goto out;
3124: type = sshkey_type_from_name(tname);
3125: switch (type) {
3126: #ifdef WITH_OPENSSL
3127: case KEY_DSA:
1.70 djm 3128: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3129: r = SSH_ERR_ALLOC_FAIL;
3130: goto out;
3131: }
1.73 djm 3132: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3133: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3134: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3135: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3136: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3137: goto out;
3138: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3139: r = SSH_ERR_LIBCRYPTO_ERROR;
3140: goto out;
3141: }
3142: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3143: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3144: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3145: goto out;
1.69 djm 3146: }
3147: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3148: break;
3149: case KEY_DSA_CERT:
1.14 djm 3150: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3151: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3152: goto out;
1.69 djm 3153: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3154: r = SSH_ERR_LIBCRYPTO_ERROR;
3155: goto out;
3156: }
3157: dsa_priv_key = NULL; /* transferred */
1.1 djm 3158: break;
3159: case KEY_ECDSA:
1.70 djm 3160: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3161: r = SSH_ERR_ALLOC_FAIL;
3162: goto out;
3163: }
3164: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3165: r = SSH_ERR_INVALID_ARGUMENT;
3166: goto out;
3167: }
3168: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3169: goto out;
3170: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3171: r = SSH_ERR_EC_CURVE_MISMATCH;
3172: goto out;
3173: }
3174: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3175: if (k->ecdsa == NULL) {
1.1 djm 3176: r = SSH_ERR_LIBCRYPTO_ERROR;
3177: goto out;
3178: }
3179: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3180: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3181: goto out;
3182: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3183: r = SSH_ERR_LIBCRYPTO_ERROR;
3184: goto out;
3185: }
3186: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3187: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3188: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3189: goto out;
3190: break;
3191: case KEY_ECDSA_CERT:
1.14 djm 3192: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3193: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3194: goto out;
3195: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3196: r = SSH_ERR_LIBCRYPTO_ERROR;
3197: goto out;
3198: }
3199: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3200: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3201: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3202: goto out;
3203: break;
3204: case KEY_RSA:
1.70 djm 3205: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3206: r = SSH_ERR_ALLOC_FAIL;
3207: goto out;
3208: }
1.73 djm 3209: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3210: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3211: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3212: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3213: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3214: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3215: goto out;
1.69 djm 3216: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3217: r = SSH_ERR_LIBCRYPTO_ERROR;
3218: goto out;
3219: }
3220: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3221: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3222: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3223: goto out;
3224: }
1.69 djm 3225: rsa_p = rsa_q = NULL; /* transferred */
3226: if ((r = check_rsa_length(k->rsa)) != 0)
3227: goto out;
3228: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3229: goto out;
1.1 djm 3230: break;
3231: case KEY_RSA_CERT:
1.14 djm 3232: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3233: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3234: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3235: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3236: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3237: goto out;
1.69 djm 3238: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3239: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3240: goto out;
3241: }
1.69 djm 3242: rsa_d = NULL; /* transferred */
3243: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3244: r = SSH_ERR_LIBCRYPTO_ERROR;
3245: goto out;
3246: }
3247: rsa_p = rsa_q = NULL; /* transferred */
3248: if ((r = check_rsa_length(k->rsa)) != 0)
3249: goto out;
3250: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3251: goto out;
1.1 djm 3252: break;
3253: #endif /* WITH_OPENSSL */
3254: case KEY_ED25519:
1.70 djm 3255: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3256: r = SSH_ERR_ALLOC_FAIL;
3257: goto out;
3258: }
3259: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3260: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3261: goto out;
3262: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3263: r = SSH_ERR_INVALID_FORMAT;
3264: goto out;
3265: }
3266: k->ed25519_pk = ed25519_pk;
3267: k->ed25519_sk = ed25519_sk;
3268: ed25519_pk = ed25519_sk = NULL;
3269: break;
3270: case KEY_ED25519_CERT:
1.14 djm 3271: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3272: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3273: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3274: goto out;
3275: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3276: r = SSH_ERR_INVALID_FORMAT;
3277: goto out;
3278: }
3279: k->ed25519_pk = ed25519_pk;
3280: k->ed25519_sk = ed25519_sk;
3281: ed25519_pk = ed25519_sk = NULL;
3282: break;
1.62 markus 3283: #ifdef WITH_XMSS
3284: case KEY_XMSS:
1.70 djm 3285: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3286: r = SSH_ERR_ALLOC_FAIL;
3287: goto out;
3288: }
3289: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3290: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3291: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3292: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3293: goto out;
3294: if (pklen != sshkey_xmss_pklen(k) ||
3295: sklen != sshkey_xmss_sklen(k)) {
3296: r = SSH_ERR_INVALID_FORMAT;
3297: goto out;
3298: }
3299: k->xmss_pk = xmss_pk;
3300: k->xmss_sk = xmss_sk;
3301: xmss_pk = xmss_sk = NULL;
3302: /* optional internal state */
3303: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3304: goto out;
3305: break;
3306: case KEY_XMSS_CERT:
3307: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3308: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3309: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3310: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3311: goto out;
1.64 markus 3312: if (strcmp(xmss_name, k->xmss_name)) {
3313: r = SSH_ERR_INVALID_FORMAT;
3314: goto out;
3315: }
1.62 markus 3316: if (pklen != sshkey_xmss_pklen(k) ||
3317: sklen != sshkey_xmss_sklen(k)) {
3318: r = SSH_ERR_INVALID_FORMAT;
3319: goto out;
3320: }
3321: k->xmss_pk = xmss_pk;
3322: k->xmss_sk = xmss_sk;
3323: xmss_pk = xmss_sk = NULL;
3324: /* optional internal state */
3325: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3326: goto out;
3327: break;
3328: #endif /* WITH_XMSS */
1.1 djm 3329: default:
3330: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3331: goto out;
3332: }
3333: #ifdef WITH_OPENSSL
3334: /* enable blinding */
3335: switch (k->type) {
3336: case KEY_RSA:
3337: case KEY_RSA_CERT:
3338: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3339: r = SSH_ERR_LIBCRYPTO_ERROR;
3340: goto out;
3341: }
3342: break;
3343: }
3344: #endif /* WITH_OPENSSL */
3345: /* success */
3346: r = 0;
3347: if (kp != NULL) {
3348: *kp = k;
3349: k = NULL;
3350: }
3351: out:
3352: free(tname);
3353: free(curve);
3354: #ifdef WITH_OPENSSL
1.60 jsing 3355: BN_clear_free(exponent);
1.69 djm 3356: BN_clear_free(dsa_p);
3357: BN_clear_free(dsa_q);
3358: BN_clear_free(dsa_g);
3359: BN_clear_free(dsa_pub_key);
3360: BN_clear_free(dsa_priv_key);
3361: BN_clear_free(rsa_n);
3362: BN_clear_free(rsa_e);
3363: BN_clear_free(rsa_d);
3364: BN_clear_free(rsa_p);
3365: BN_clear_free(rsa_q);
3366: BN_clear_free(rsa_iqmp);
1.1 djm 3367: #endif /* WITH_OPENSSL */
3368: sshkey_free(k);
1.61 jsing 3369: freezero(ed25519_pk, pklen);
3370: freezero(ed25519_sk, sklen);
1.62 markus 3371: free(xmss_name);
3372: freezero(xmss_pk, pklen);
3373: freezero(xmss_sk, sklen);
1.1 djm 3374: return r;
3375: }
3376:
3377: #ifdef WITH_OPENSSL
3378: int
3379: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3380: {
3381: BN_CTX *bnctx;
3382: EC_POINT *nq = NULL;
3383: BIGNUM *order, *x, *y, *tmp;
3384: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3385:
3386: /*
3387: * NB. This assumes OpenSSL has already verified that the public
3388: * point lies on the curve. This is done by EC_POINT_oct2point()
3389: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3390: * reachable with public points not unmarshalled using
3391: * EC_POINT_oct2point then the caller will need to explicitly check.
3392: */
1.1 djm 3393:
3394: if ((bnctx = BN_CTX_new()) == NULL)
3395: return SSH_ERR_ALLOC_FAIL;
3396: BN_CTX_start(bnctx);
3397:
3398: /*
3399: * We shouldn't ever hit this case because bignum_get_ecpoint()
3400: * refuses to load GF2m points.
3401: */
3402: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3403: NID_X9_62_prime_field)
3404: goto out;
3405:
3406: /* Q != infinity */
3407: if (EC_POINT_is_at_infinity(group, public))
3408: goto out;
3409:
3410: if ((x = BN_CTX_get(bnctx)) == NULL ||
3411: (y = BN_CTX_get(bnctx)) == NULL ||
3412: (order = BN_CTX_get(bnctx)) == NULL ||
3413: (tmp = BN_CTX_get(bnctx)) == NULL) {
3414: ret = SSH_ERR_ALLOC_FAIL;
3415: goto out;
3416: }
3417:
3418: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3419: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3420: EC_POINT_get_affine_coordinates_GFp(group, public,
3421: x, y, bnctx) != 1) {
3422: ret = SSH_ERR_LIBCRYPTO_ERROR;
3423: goto out;
3424: }
3425: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3426: BN_num_bits(y) <= BN_num_bits(order) / 2)
3427: goto out;
3428:
3429: /* nQ == infinity (n == order of subgroup) */
3430: if ((nq = EC_POINT_new(group)) == NULL) {
3431: ret = SSH_ERR_ALLOC_FAIL;
3432: goto out;
3433: }
3434: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3435: ret = SSH_ERR_LIBCRYPTO_ERROR;
3436: goto out;
3437: }
3438: if (EC_POINT_is_at_infinity(group, nq) != 1)
3439: goto out;
3440:
3441: /* x < order - 1, y < order - 1 */
3442: if (!BN_sub(tmp, order, BN_value_one())) {
3443: ret = SSH_ERR_LIBCRYPTO_ERROR;
3444: goto out;
3445: }
3446: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3447: goto out;
3448: ret = 0;
3449: out:
3450: BN_CTX_free(bnctx);
1.60 jsing 3451: EC_POINT_free(nq);
1.1 djm 3452: return ret;
3453: }
3454:
3455: int
3456: sshkey_ec_validate_private(const EC_KEY *key)
3457: {
3458: BN_CTX *bnctx;
3459: BIGNUM *order, *tmp;
3460: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3461:
3462: if ((bnctx = BN_CTX_new()) == NULL)
3463: return SSH_ERR_ALLOC_FAIL;
3464: BN_CTX_start(bnctx);
3465:
3466: if ((order = BN_CTX_get(bnctx)) == NULL ||
3467: (tmp = BN_CTX_get(bnctx)) == NULL) {
3468: ret = SSH_ERR_ALLOC_FAIL;
3469: goto out;
3470: }
3471:
3472: /* log2(private) > log2(order)/2 */
3473: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3474: ret = SSH_ERR_LIBCRYPTO_ERROR;
3475: goto out;
3476: }
3477: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3478: BN_num_bits(order) / 2)
3479: goto out;
3480:
3481: /* private < order - 1 */
3482: if (!BN_sub(tmp, order, BN_value_one())) {
3483: ret = SSH_ERR_LIBCRYPTO_ERROR;
3484: goto out;
3485: }
3486: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3487: goto out;
3488: ret = 0;
3489: out:
3490: BN_CTX_free(bnctx);
3491: return ret;
3492: }
3493:
3494: void
3495: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3496: {
3497: BIGNUM *x, *y;
3498: BN_CTX *bnctx;
3499:
3500: if (point == NULL) {
3501: fputs("point=(NULL)\n", stderr);
3502: return;
3503: }
3504: if ((bnctx = BN_CTX_new()) == NULL) {
3505: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3506: return;
3507: }
3508: BN_CTX_start(bnctx);
3509: if ((x = BN_CTX_get(bnctx)) == NULL ||
3510: (y = BN_CTX_get(bnctx)) == NULL) {
3511: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3512: return;
3513: }
3514: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3515: NID_X9_62_prime_field) {
3516: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3517: return;
3518: }
3519: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3520: bnctx) != 1) {
3521: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3522: __func__);
3523: return;
3524: }
3525: fputs("x=", stderr);
3526: BN_print_fp(stderr, x);
3527: fputs("\ny=", stderr);
3528: BN_print_fp(stderr, y);
3529: fputs("\n", stderr);
3530: BN_CTX_free(bnctx);
3531: }
3532:
3533: void
3534: sshkey_dump_ec_key(const EC_KEY *key)
3535: {
3536: const BIGNUM *exponent;
3537:
3538: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3539: EC_KEY_get0_public_key(key));
3540: fputs("exponent=", stderr);
3541: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3542: fputs("(NULL)", stderr);
3543: else
3544: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3545: fputs("\n", stderr);
3546: }
3547: #endif /* WITH_OPENSSL */
3548:
3549: static int
1.76 djm 3550: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3551: const char *passphrase, const char *comment, const char *ciphername,
3552: int rounds)
3553: {
1.4 djm 3554: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3555: u_char salt[SALT_LEN];
1.4 djm 3556: char *b64 = NULL;
1.1 djm 3557: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3558: u_int check;
3559: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3560: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3561: const struct sshcipher *cipher;
3562: const char *kdfname = KDFNAME;
3563: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3564:
3565: if (rounds <= 0)
3566: rounds = DEFAULT_ROUNDS;
3567: if (passphrase == NULL || !strlen(passphrase)) {
3568: ciphername = "none";
3569: kdfname = "none";
3570: } else if (ciphername == NULL)
3571: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3572: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3573: r = SSH_ERR_INVALID_ARGUMENT;
3574: goto out;
3575: }
3576:
3577: if ((kdf = sshbuf_new()) == NULL ||
3578: (encoded = sshbuf_new()) == NULL ||
3579: (encrypted = sshbuf_new()) == NULL) {
3580: r = SSH_ERR_ALLOC_FAIL;
3581: goto out;
3582: }
3583: blocksize = cipher_blocksize(cipher);
3584: keylen = cipher_keylen(cipher);
3585: ivlen = cipher_ivlen(cipher);
3586: authlen = cipher_authlen(cipher);
3587: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3588: r = SSH_ERR_ALLOC_FAIL;
3589: goto out;
3590: }
3591: if (strcmp(kdfname, "bcrypt") == 0) {
3592: arc4random_buf(salt, SALT_LEN);
3593: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3594: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3595: r = SSH_ERR_INVALID_ARGUMENT;
3596: goto out;
3597: }
3598: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3599: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3600: goto out;
3601: } else if (strcmp(kdfname, "none") != 0) {
3602: /* Unsupported KDF type */
3603: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3604: goto out;
3605: }
3606: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3607: key + keylen, ivlen, 1)) != 0)
3608: goto out;
3609:
3610: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3611: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3612: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3613: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3614: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3615: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3616: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3617: goto out;
3618:
3619: /* set up the buffer that will be encrypted */
3620:
3621: /* Random check bytes */
3622: check = arc4random();
3623: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3624: (r = sshbuf_put_u32(encrypted, check)) != 0)
3625: goto out;
3626:
3627: /* append private key and comment*/
1.62 markus 3628: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3629: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3630: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3631: goto out;
3632:
3633: /* padding */
3634: i = 0;
3635: while (sshbuf_len(encrypted) % blocksize) {
3636: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3637: goto out;
3638: }
3639:
3640: /* length in destination buffer */
3641: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3642: goto out;
3643:
3644: /* encrypt */
3645: if ((r = sshbuf_reserve(encoded,
3646: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3647: goto out;
1.36 djm 3648: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3649: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3650: goto out;
3651:
1.81 djm 3652: sshbuf_reset(blob);
1.1 djm 3653:
1.81 djm 3654: /* assemble uuencoded key */
3655: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3656: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3657: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3658: goto out;
3659:
3660: /* success */
3661: r = 0;
3662:
3663: out:
3664: sshbuf_free(kdf);
3665: sshbuf_free(encoded);
3666: sshbuf_free(encrypted);
1.36 djm 3667: cipher_free(ciphercontext);
1.1 djm 3668: explicit_bzero(salt, sizeof(salt));
3669: if (key != NULL) {
3670: explicit_bzero(key, keylen + ivlen);
3671: free(key);
3672: }
3673: if (pubkeyblob != NULL) {
3674: explicit_bzero(pubkeyblob, pubkeylen);
3675: free(pubkeyblob);
3676: }
3677: if (b64 != NULL) {
3678: explicit_bzero(b64, strlen(b64));
3679: free(b64);
3680: }
3681: return r;
3682: }
3683:
3684: static int
3685: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3686: struct sshkey **keyp, char **commentp)
3687: {
3688: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3689: const struct sshcipher *cipher = NULL;
3690: const u_char *cp;
3691: int r = SSH_ERR_INTERNAL_ERROR;
3692: size_t encoded_len;
1.18 djm 3693: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3694: struct sshbuf *encoded = NULL, *decoded = NULL;
3695: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3696: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3697: struct sshkey *k = NULL;
3698: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3699: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3700:
3701: if (keyp != NULL)
3702: *keyp = NULL;
3703: if (commentp != NULL)
3704: *commentp = NULL;
3705:
3706: if ((encoded = sshbuf_new()) == NULL ||
3707: (decoded = sshbuf_new()) == NULL ||
3708: (decrypted = sshbuf_new()) == NULL) {
3709: r = SSH_ERR_ALLOC_FAIL;
3710: goto out;
3711: }
3712:
3713: /* check preamble */
3714: cp = sshbuf_ptr(blob);
3715: encoded_len = sshbuf_len(blob);
3716: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3717: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3718: r = SSH_ERR_INVALID_FORMAT;
3719: goto out;
3720: }
3721: cp += MARK_BEGIN_LEN;
3722: encoded_len -= MARK_BEGIN_LEN;
3723:
3724: /* Look for end marker, removing whitespace as we go */
3725: while (encoded_len > 0) {
3726: if (*cp != '\n' && *cp != '\r') {
3727: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3728: goto out;
3729: }
3730: last = *cp;
3731: encoded_len--;
3732: cp++;
3733: if (last == '\n') {
3734: if (encoded_len >= MARK_END_LEN &&
3735: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3736: /* \0 terminate */
3737: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3738: goto out;
3739: break;
3740: }
3741: }
3742: }
3743: if (encoded_len == 0) {
3744: r = SSH_ERR_INVALID_FORMAT;
3745: goto out;
3746: }
3747:
3748: /* decode base64 */
1.4 djm 3749: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3750: goto out;
3751:
3752: /* check magic */
3753: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3754: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3755: r = SSH_ERR_INVALID_FORMAT;
3756: goto out;
3757: }
3758: /* parse public portion of key */
3759: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3760: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3761: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3762: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3763: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3764: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3765: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3766: goto out;
3767:
3768: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3769: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3770: goto out;
3771: }
3772: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3773: strcmp(ciphername, "none") != 0) {
3774: /* passphrase required */
3775: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3776: goto out;
3777: }
3778: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3779: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3780: goto out;
3781: }
3782: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3783: r = SSH_ERR_INVALID_FORMAT;
3784: goto out;
3785: }
3786: if (nkeys != 1) {
3787: /* XXX only one key supported */
3788: r = SSH_ERR_INVALID_FORMAT;
3789: goto out;
3790: }
3791:
3792: /* check size of encrypted key blob */
3793: blocksize = cipher_blocksize(cipher);
3794: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3795: r = SSH_ERR_INVALID_FORMAT;
3796: goto out;
3797: }
3798:
3799: /* setup key */
3800: keylen = cipher_keylen(cipher);
3801: ivlen = cipher_ivlen(cipher);
1.18 djm 3802: authlen = cipher_authlen(cipher);
1.1 djm 3803: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3804: r = SSH_ERR_ALLOC_FAIL;
3805: goto out;
3806: }
3807: if (strcmp(kdfname, "bcrypt") == 0) {
3808: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3809: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3810: goto out;
3811: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3812: key, keylen + ivlen, rounds) < 0) {
3813: r = SSH_ERR_INVALID_FORMAT;
3814: goto out;
3815: }
3816: }
3817:
1.18 djm 3818: /* check that an appropriate amount of auth data is present */
3819: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3820: r = SSH_ERR_INVALID_FORMAT;
3821: goto out;
3822: }
3823:
1.1 djm 3824: /* decrypt private portion of key */
3825: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3826: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3827: key + keylen, ivlen, 0)) != 0)
3828: goto out;
1.36 djm 3829: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3830: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3831: /* an integrity error here indicates an incorrect passphrase */
3832: if (r == SSH_ERR_MAC_INVALID)
3833: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3834: goto out;
3835: }
1.18 djm 3836: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3837: goto out;
3838: /* there should be no trailing data */
3839: if (sshbuf_len(decoded) != 0) {
3840: r = SSH_ERR_INVALID_FORMAT;
3841: goto out;
3842: }
3843:
3844: /* check check bytes */
3845: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3846: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3847: goto out;
3848: if (check1 != check2) {
3849: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3850: goto out;
3851: }
3852:
3853: /* Load the private key and comment */
3854: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3855: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3856: goto out;
3857:
3858: /* Check deterministic padding */
3859: i = 0;
3860: while (sshbuf_len(decrypted)) {
3861: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3862: goto out;
3863: if (pad != (++i & 0xff)) {
3864: r = SSH_ERR_INVALID_FORMAT;
3865: goto out;
3866: }
3867: }
3868:
3869: /* XXX decode pubkey and check against private */
3870:
3871: /* success */
3872: r = 0;
3873: if (keyp != NULL) {
3874: *keyp = k;
3875: k = NULL;
3876: }
3877: if (commentp != NULL) {
3878: *commentp = comment;
3879: comment = NULL;
3880: }
3881: out:
3882: pad = 0;
1.36 djm 3883: cipher_free(ciphercontext);
1.1 djm 3884: free(ciphername);
3885: free(kdfname);
3886: free(comment);
3887: if (salt != NULL) {
3888: explicit_bzero(salt, slen);
3889: free(salt);
3890: }
3891: if (key != NULL) {
3892: explicit_bzero(key, keylen + ivlen);
3893: free(key);
3894: }
3895: sshbuf_free(encoded);
3896: sshbuf_free(decoded);
3897: sshbuf_free(kdf);
3898: sshbuf_free(decrypted);
3899: sshkey_free(k);
3900: return r;
3901: }
3902:
3903:
3904: #ifdef WITH_OPENSSL
1.80 djm 3905: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3906: static int
1.80 djm 3907: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3908: int format, const char *_passphrase, const char *comment)
1.1 djm 3909: {
1.76 djm 3910: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3911: int success, r;
3912: int blen, len = strlen(_passphrase);
3913: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3914: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3915: char *bptr;
1.1 djm 3916: BIO *bio = NULL;
1.76 djm 3917: struct sshbuf *blob;
1.80 djm 3918: EVP_PKEY *pkey = NULL;
1.1 djm 3919:
3920: if (len > 0 && len <= 4)
3921: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3922: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3923: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3924: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3925: r = SSH_ERR_ALLOC_FAIL;
3926: goto out;
3927: }
3928: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3929: r = SSH_ERR_ALLOC_FAIL;
3930: goto out;
1.76 djm 3931: }
3932: if ((r = sshkey_unshield_private(key)) != 0)
3933: goto out;
1.1 djm 3934:
3935: switch (key->type) {
3936: case KEY_DSA:
1.80 djm 3937: if (format == SSHKEY_PRIVATE_PEM) {
3938: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3939: cipher, passphrase, len, NULL, NULL);
3940: } else {
3941: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3942: }
1.1 djm 3943: break;
3944: case KEY_ECDSA:
1.80 djm 3945: if (format == SSHKEY_PRIVATE_PEM) {
3946: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3947: cipher, passphrase, len, NULL, NULL);
3948: } else {
3949: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3950: }
1.1 djm 3951: break;
3952: case KEY_RSA:
1.80 djm 3953: if (format == SSHKEY_PRIVATE_PEM) {
3954: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3955: cipher, passphrase, len, NULL, NULL);
3956: } else {
3957: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3958: }
1.1 djm 3959: break;
3960: default:
3961: success = 0;
3962: break;
3963: }
3964: if (success == 0) {
3965: r = SSH_ERR_LIBCRYPTO_ERROR;
3966: goto out;
3967: }
1.80 djm 3968: if (format == SSHKEY_PRIVATE_PKCS8) {
3969: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3970: passphrase, len, NULL, NULL)) == 0) {
3971: r = SSH_ERR_LIBCRYPTO_ERROR;
3972: goto out;
3973: }
3974: }
1.1 djm 3975: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3976: r = SSH_ERR_INTERNAL_ERROR;
3977: goto out;
3978: }
3979: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3980: goto out;
3981: r = 0;
3982: out:
1.76 djm 3983: if (was_shielded)
3984: r = sshkey_shield_private(key);
3985: if (r == 0)
3986: r = sshbuf_putb(buf, blob);
1.80 djm 3987:
3988: EVP_PKEY_free(pkey);
1.76 djm 3989: sshbuf_free(blob);
1.1 djm 3990: BIO_free(bio);
3991: return r;
3992: }
3993: #endif /* WITH_OPENSSL */
3994:
3995: /* Serialise "key" to buffer "blob" */
3996: int
3997: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3998: const char *passphrase, const char *comment,
1.80 djm 3999: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4000: {
4001: switch (key->type) {
1.9 markus 4002: #ifdef WITH_OPENSSL
1.1 djm 4003: case KEY_DSA:
4004: case KEY_ECDSA:
4005: case KEY_RSA:
1.80 djm 4006: break; /* see below */
1.1 djm 4007: #endif /* WITH_OPENSSL */
4008: case KEY_ED25519:
1.62 markus 4009: #ifdef WITH_XMSS
4010: case KEY_XMSS:
4011: #endif /* WITH_XMSS */
1.1 djm 4012: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4013: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4014: default:
4015: return SSH_ERR_KEY_TYPE_UNKNOWN;
4016: }
1.80 djm 4017:
4018: #ifdef WITH_OPENSSL
4019: switch (format) {
4020: case SSHKEY_PRIVATE_OPENSSH:
4021: return sshkey_private_to_blob2(key, blob, passphrase,
4022: comment, openssh_format_cipher, openssh_format_rounds);
4023: case SSHKEY_PRIVATE_PEM:
4024: case SSHKEY_PRIVATE_PKCS8:
4025: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4026: format, passphrase, comment);
4027: default:
4028: return SSH_ERR_INVALID_ARGUMENT;
4029: }
4030: #endif /* WITH_OPENSSL */
1.1 djm 4031: }
4032:
4033:
4034: #ifdef WITH_OPENSSL
1.8 djm 4035: static int
1.52 djm 4036: translate_libcrypto_error(unsigned long pem_err)
4037: {
4038: int pem_reason = ERR_GET_REASON(pem_err);
4039:
4040: switch (ERR_GET_LIB(pem_err)) {
4041: case ERR_LIB_PEM:
4042: switch (pem_reason) {
4043: case PEM_R_BAD_PASSWORD_READ:
4044: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4045: case PEM_R_BAD_DECRYPT:
4046: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4047: default:
4048: return SSH_ERR_INVALID_FORMAT;
4049: }
4050: case ERR_LIB_EVP:
4051: switch (pem_reason) {
4052: case EVP_R_BAD_DECRYPT:
4053: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4054: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4055: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4056: #endif
1.52 djm 4057: case EVP_R_DECODE_ERROR:
4058: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4059: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4060: #endif
4061: return SSH_ERR_INVALID_FORMAT;
4062: default:
4063: return SSH_ERR_LIBCRYPTO_ERROR;
4064: }
4065: case ERR_LIB_ASN1:
4066: return SSH_ERR_INVALID_FORMAT;
4067: }
4068: return SSH_ERR_LIBCRYPTO_ERROR;
4069: }
4070:
4071: static void
4072: clear_libcrypto_errors(void)
4073: {
4074: while (ERR_get_error() != 0)
4075: ;
4076: }
4077:
4078: /*
4079: * Translate OpenSSL error codes to determine whether
4080: * passphrase is required/incorrect.
4081: */
4082: static int
4083: convert_libcrypto_error(void)
4084: {
4085: /*
4086: * Some password errors are reported at the beginning
4087: * of the error queue.
4088: */
4089: if (translate_libcrypto_error(ERR_peek_error()) ==
4090: SSH_ERR_KEY_WRONG_PASSPHRASE)
4091: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4092: return translate_libcrypto_error(ERR_peek_last_error());
4093: }
4094:
4095: static int
1.1 djm 4096: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4097: const char *passphrase, struct sshkey **keyp)
1.1 djm 4098: {
4099: EVP_PKEY *pk = NULL;
4100: struct sshkey *prv = NULL;
4101: BIO *bio = NULL;
4102: int r;
4103:
1.32 djm 4104: if (keyp != NULL)
4105: *keyp = NULL;
1.1 djm 4106:
4107: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4108: return SSH_ERR_ALLOC_FAIL;
4109: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4110: (int)sshbuf_len(blob)) {
4111: r = SSH_ERR_ALLOC_FAIL;
4112: goto out;
4113: }
4114:
1.52 djm 4115: clear_libcrypto_errors();
1.1 djm 4116: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4117: (char *)passphrase)) == NULL) {
1.71 djm 4118: /*
4119: * libcrypto may return various ASN.1 errors when attempting
4120: * to parse a key with an incorrect passphrase.
4121: * Treat all format errors as "incorrect passphrase" if a
4122: * passphrase was supplied.
4123: */
4124: if (passphrase != NULL && *passphrase != '\0')
4125: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4126: else
4127: r = convert_libcrypto_error();
1.1 djm 4128: goto out;
4129: }
1.69 djm 4130: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4131: (type == KEY_UNSPEC || type == KEY_RSA)) {
4132: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4133: r = SSH_ERR_ALLOC_FAIL;
4134: goto out;
4135: }
4136: prv->rsa = EVP_PKEY_get1_RSA(pk);
4137: prv->type = KEY_RSA;
4138: #ifdef DEBUG_PK
4139: RSA_print_fp(stderr, prv->rsa, 8);
4140: #endif
4141: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4142: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4143: goto out;
4144: }
1.69 djm 4145: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4146: goto out;
1.69 djm 4147: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4148: (type == KEY_UNSPEC || type == KEY_DSA)) {
4149: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4150: r = SSH_ERR_ALLOC_FAIL;
4151: goto out;
4152: }
4153: prv->dsa = EVP_PKEY_get1_DSA(pk);
4154: prv->type = KEY_DSA;
4155: #ifdef DEBUG_PK
4156: DSA_print_fp(stderr, prv->dsa, 8);
4157: #endif
1.69 djm 4158: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4159: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4160: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4161: r = SSH_ERR_ALLOC_FAIL;
4162: goto out;
4163: }
4164: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4165: prv->type = KEY_ECDSA;
4166: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4167: if (prv->ecdsa_nid == -1 ||
4168: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4169: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4170: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4171: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4172: r = SSH_ERR_INVALID_FORMAT;
4173: goto out;
4174: }
4175: #ifdef DEBUG_PK
4176: if (prv != NULL && prv->ecdsa != NULL)
4177: sshkey_dump_ec_key(prv->ecdsa);
4178: #endif
4179: } else {
4180: r = SSH_ERR_INVALID_FORMAT;
4181: goto out;
4182: }
4183: r = 0;
1.32 djm 4184: if (keyp != NULL) {
4185: *keyp = prv;
4186: prv = NULL;
4187: }
1.1 djm 4188: out:
4189: BIO_free(bio);
1.60 jsing 4190: EVP_PKEY_free(pk);
1.30 mmcc 4191: sshkey_free(prv);
1.1 djm 4192: return r;
4193: }
4194: #endif /* WITH_OPENSSL */
4195:
4196: int
4197: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4198: const char *passphrase, struct sshkey **keyp, char **commentp)
4199: {
1.42 djm 4200: int r = SSH_ERR_INTERNAL_ERROR;
4201:
1.32 djm 4202: if (keyp != NULL)
4203: *keyp = NULL;
1.1 djm 4204: if (commentp != NULL)
4205: *commentp = NULL;
4206:
4207: switch (type) {
1.9 markus 4208: #ifdef WITH_OPENSSL
1.1 djm 4209: case KEY_DSA:
4210: case KEY_ECDSA:
4211: case KEY_RSA:
1.8 djm 4212: return sshkey_parse_private_pem_fileblob(blob, type,
4213: passphrase, keyp);
1.1 djm 4214: #endif /* WITH_OPENSSL */
4215: case KEY_ED25519:
1.62 markus 4216: #ifdef WITH_XMSS
4217: case KEY_XMSS:
4218: #endif /* WITH_XMSS */
1.1 djm 4219: return sshkey_parse_private2(blob, type, passphrase,
4220: keyp, commentp);
4221: case KEY_UNSPEC:
1.42 djm 4222: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4223: commentp);
4224: /* Do not fallback to PEM parser if only passphrase is wrong. */
4225: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4226: return r;
1.1 djm 4227: #ifdef WITH_OPENSSL
1.8 djm 4228: return sshkey_parse_private_pem_fileblob(blob, type,
4229: passphrase, keyp);
1.1 djm 4230: #else
4231: return SSH_ERR_INVALID_FORMAT;
4232: #endif /* WITH_OPENSSL */
4233: default:
4234: return SSH_ERR_KEY_TYPE_UNKNOWN;
4235: }
4236: }
4237:
4238: int
4239: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4240: struct sshkey **keyp, char **commentp)
1.1 djm 4241: {
4242: if (keyp != NULL)
4243: *keyp = NULL;
4244: if (commentp != NULL)
4245: *commentp = NULL;
4246:
1.23 tim 4247: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4248: passphrase, keyp, commentp);
1.1 djm 4249: }
1.62 markus 4250:
4251: #ifdef WITH_XMSS
4252: /*
4253: * serialize the key with the current state and forward the state
4254: * maxsign times.
4255: */
4256: int
1.77 djm 4257: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4258: u_int32_t maxsign, sshkey_printfn *pr)
4259: {
4260: int r, rupdate;
4261:
4262: if (maxsign == 0 ||
4263: sshkey_type_plain(k->type) != KEY_XMSS)
4264: return sshkey_private_serialize_opt(k, b,
4265: SSHKEY_SERIALIZE_DEFAULT);
4266: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4267: (r = sshkey_private_serialize_opt(k, b,
4268: SSHKEY_SERIALIZE_STATE)) != 0 ||
4269: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4270: goto out;
4271: r = 0;
4272: out:
4273: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4274: if (r == 0)
4275: r = rupdate;
4276: }
4277: return r;
4278: }
4279:
4280: u_int32_t
4281: sshkey_signatures_left(const struct sshkey *k)
4282: {
4283: if (sshkey_type_plain(k->type) == KEY_XMSS)
4284: return sshkey_xmss_signatures_left(k);
4285: return 0;
4286: }
4287:
4288: int
4289: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4290: {
4291: if (sshkey_type_plain(k->type) != KEY_XMSS)
4292: return SSH_ERR_INVALID_ARGUMENT;
4293: return sshkey_xmss_enable_maxsign(k, maxsign);
4294: }
4295:
4296: int
4297: sshkey_set_filename(struct sshkey *k, const char *filename)
4298: {
4299: if (k == NULL)
4300: return SSH_ERR_INVALID_ARGUMENT;
4301: if (sshkey_type_plain(k->type) != KEY_XMSS)
4302: return 0;
4303: if (filename == NULL)
4304: return SSH_ERR_INVALID_ARGUMENT;
4305: if ((k->xmss_filename = strdup(filename)) == NULL)
4306: return SSH_ERR_ALLOC_FAIL;
4307: return 0;
4308: }
4309: #else
4310: int
1.76 djm 4311: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4312: u_int32_t maxsign, sshkey_printfn *pr)
4313: {
4314: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4315: }
4316:
4317: u_int32_t
4318: sshkey_signatures_left(const struct sshkey *k)
4319: {
4320: return 0;
4321: }
4322:
4323: int
4324: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4325: {
4326: return SSH_ERR_INVALID_ARGUMENT;
4327: }
4328:
4329: int
4330: sshkey_set_filename(struct sshkey *k, const char *filename)
4331: {
4332: if (k == NULL)
4333: return SSH_ERR_INVALID_ARGUMENT;
4334: return 0;
4335: }
4336: #endif /* WITH_XMSS */
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