Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.83
1.83 ! djm 1: /* $OpenBSD: sshkey.c,v 1.82 2019/09/03 08:31:20 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);
1.83 ! djm 1827: #ifdef WITH_OPENSSL
1.69 djm 1828: BN_clear_free(rsa_n_dup);
1829: BN_clear_free(rsa_e_dup);
1830: BN_clear_free(dsa_p_dup);
1831: BN_clear_free(dsa_q_dup);
1832: BN_clear_free(dsa_g_dup);
1833: BN_clear_free(dsa_pub_key_dup);
1.83 ! djm 1834: #endif /* WITH_OPENSSL */
1.69 djm 1835:
1836: return r;
1.1 djm 1837: }
1838:
1.76 djm 1839: int
1840: sshkey_is_shielded(struct sshkey *k)
1841: {
1842: return k != NULL && k->shielded_private != NULL;
1843: }
1844:
1845: int
1846: sshkey_shield_private(struct sshkey *k)
1847: {
1848: struct sshbuf *prvbuf = NULL;
1849: u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
1850: struct sshcipher_ctx *cctx = NULL;
1851: const struct sshcipher *cipher;
1852: size_t i, enclen = 0;
1853: struct sshkey *kswap = NULL, tmp;
1854: int r = SSH_ERR_INTERNAL_ERROR;
1855:
1856: #ifdef DEBUG_PK
1857: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1858: #endif
1859: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1860: r = SSH_ERR_INVALID_ARGUMENT;
1861: goto out;
1862: }
1863: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1864: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1865: r = SSH_ERR_INTERNAL_ERROR;
1866: goto out;
1867: }
1868:
1869: /* Prepare a random pre-key, and from it an ephemeral key */
1870: if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
1871: r = SSH_ERR_ALLOC_FAIL;
1872: goto out;
1873: }
1874: arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1875: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1876: prekey, SSHKEY_SHIELD_PREKEY_LEN,
1877: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1878: goto out;
1879: #ifdef DEBUG_PK
1880: fprintf(stderr, "%s: key+iv\n", __func__);
1881: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1882: stderr);
1883: #endif
1884: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1885: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1886: goto out;
1887:
1888: /* Serialise and encrypt the private key using the ephemeral key */
1889: if ((prvbuf = sshbuf_new()) == NULL) {
1890: r = SSH_ERR_ALLOC_FAIL;
1891: goto out;
1892: }
1893: if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1894: goto out;
1895: if ((r = sshkey_private_serialize_opt(k, prvbuf,
1896: SSHKEY_SERIALIZE_FULL)) != 0)
1897: goto out;
1898: /* pad to cipher blocksize */
1899: i = 0;
1900: while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1901: if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1902: goto out;
1903: }
1904: #ifdef DEBUG_PK
1905: fprintf(stderr, "%s: serialised\n", __func__);
1906: sshbuf_dump(prvbuf, stderr);
1907: #endif
1908: /* encrypt */
1909: enclen = sshbuf_len(prvbuf);
1910: if ((enc = malloc(enclen)) == NULL) {
1911: r = SSH_ERR_ALLOC_FAIL;
1912: goto out;
1913: }
1914: if ((r = cipher_crypt(cctx, 0, enc,
1915: sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1916: goto out;
1917: #ifdef DEBUG_PK
1918: fprintf(stderr, "%s: encrypted\n", __func__);
1919: sshbuf_dump_data(enc, enclen, stderr);
1920: #endif
1921:
1922: /* Make a scrubbed, public-only copy of our private key argument */
1923: if ((r = sshkey_from_private(k, &kswap)) != 0)
1924: goto out;
1925:
1926: /* Swap the private key out (it will be destroyed below) */
1927: tmp = *kswap;
1928: *kswap = *k;
1929: *k = tmp;
1930:
1931: /* Insert the shielded key into our argument */
1932: k->shielded_private = enc;
1933: k->shielded_len = enclen;
1934: k->shield_prekey = prekey;
1935: k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
1936: enc = prekey = NULL; /* transferred */
1937: enclen = 0;
1938:
1939: /* success */
1940: r = 0;
1941:
1942: out:
1943: /* XXX behaviour on error - invalidate original private key? */
1944: cipher_free(cctx);
1945: explicit_bzero(keyiv, sizeof(keyiv));
1946: explicit_bzero(&tmp, sizeof(tmp));
1.78 djm 1947: freezero(enc, enclen);
1.76 djm 1948: freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
1949: sshkey_free(kswap);
1950: sshbuf_free(prvbuf);
1951: return r;
1952: }
1953:
1954: int
1955: sshkey_unshield_private(struct sshkey *k)
1956: {
1957: struct sshbuf *prvbuf = NULL;
1958: u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
1959: struct sshcipher_ctx *cctx = NULL;
1960: const struct sshcipher *cipher;
1961: size_t i;
1962: struct sshkey *kswap = NULL, tmp;
1963: int r = SSH_ERR_INTERNAL_ERROR;
1964:
1965: #ifdef DEBUG_PK
1966: fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1967: #endif
1968: if (!sshkey_is_shielded(k))
1969: return 0; /* nothing to do */
1970:
1971: if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
1972: r = SSH_ERR_INVALID_ARGUMENT;
1973: goto out;
1974: }
1975: if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1976: ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
1977: r = SSH_ERR_INTERNAL_ERROR;
1978: goto out;
1979: }
1980: /* check size of shielded key blob */
1981: if (k->shielded_len < cipher_blocksize(cipher) ||
1982: (k->shielded_len % cipher_blocksize(cipher)) != 0) {
1983: r = SSH_ERR_INVALID_FORMAT;
1984: goto out;
1985: }
1986:
1987: /* Calculate the ephemeral key from the prekey */
1988: if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
1989: k->shield_prekey, k->shield_prekey_len,
1990: keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
1991: goto out;
1992: if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1993: keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1994: goto out;
1995: #ifdef DEBUG_PK
1996: fprintf(stderr, "%s: key+iv\n", __func__);
1997: sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
1998: stderr);
1999: #endif
2000:
2001: /* Decrypt and parse the shielded private key using the ephemeral key */
2002: if ((prvbuf = sshbuf_new()) == NULL) {
2003: r = SSH_ERR_ALLOC_FAIL;
2004: goto out;
2005: }
2006: if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
2007: goto out;
2008: /* decrypt */
2009: #ifdef DEBUG_PK
2010: fprintf(stderr, "%s: encrypted\n", __func__);
2011: sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
2012: #endif
2013: if ((r = cipher_crypt(cctx, 0, cp,
2014: k->shielded_private, k->shielded_len, 0, 0)) != 0)
2015: goto out;
2016: #ifdef DEBUG_PK
2017: fprintf(stderr, "%s: serialised\n", __func__);
2018: sshbuf_dump(prvbuf, stderr);
2019: #endif
2020: /* Parse private key */
2021: if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
2022: goto out;
2023: /* Check deterministic padding */
2024: i = 0;
2025: while (sshbuf_len(prvbuf)) {
2026: if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0)
2027: goto out;
2028: if (pad != (++i & 0xff)) {
2029: r = SSH_ERR_INVALID_FORMAT;
2030: goto out;
2031: }
2032: }
2033:
2034: /* Swap the parsed key back into place */
2035: tmp = *kswap;
2036: *kswap = *k;
2037: *k = tmp;
2038:
2039: /* success */
2040: r = 0;
2041:
2042: out:
2043: cipher_free(cctx);
2044: explicit_bzero(keyiv, sizeof(keyiv));
2045: explicit_bzero(&tmp, sizeof(tmp));
2046: sshkey_free(kswap);
2047: sshbuf_free(prvbuf);
2048: return r;
2049: }
2050:
1.1 djm 2051: static int
1.14 djm 2052: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 2053: {
1.14 djm 2054: struct sshbuf *principals = NULL, *crit = NULL;
2055: struct sshbuf *exts = NULL, *ca = NULL;
2056: u_char *sig = NULL;
2057: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 2058: int ret = SSH_ERR_INTERNAL_ERROR;
2059:
2060: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 2061: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 2062: return ret;
2063:
1.20 djm 2064: /* Parse body of certificate up to signature */
2065: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 2066: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
2067: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 2068: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 2069: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
2070: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 2071: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 2072: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 2073: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 2074: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 2075: /* XXX debug print error for ret */
2076: ret = SSH_ERR_INVALID_FORMAT;
2077: goto out;
2078: }
2079:
2080: /* Signature is left in the buffer so we can calculate this length */
2081: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
2082:
2083: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
2084: ret = SSH_ERR_INVALID_FORMAT;
2085: goto out;
2086: }
2087:
2088: if (key->cert->type != SSH2_CERT_TYPE_USER &&
2089: key->cert->type != SSH2_CERT_TYPE_HOST) {
2090: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
2091: goto out;
2092: }
2093:
1.4 djm 2094: /* Parse principals section */
2095: while (sshbuf_len(principals) > 0) {
2096: char *principal = NULL;
2097: char **oprincipals = NULL;
2098:
1.1 djm 2099: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
2100: ret = SSH_ERR_INVALID_FORMAT;
2101: goto out;
2102: }
1.4 djm 2103: if ((ret = sshbuf_get_cstring(principals, &principal,
2104: NULL)) != 0) {
1.1 djm 2105: ret = SSH_ERR_INVALID_FORMAT;
2106: goto out;
2107: }
2108: oprincipals = key->cert->principals;
1.51 deraadt 2109: key->cert->principals = recallocarray(key->cert->principals,
2110: key->cert->nprincipals, key->cert->nprincipals + 1,
2111: sizeof(*key->cert->principals));
1.1 djm 2112: if (key->cert->principals == NULL) {
2113: free(principal);
2114: key->cert->principals = oprincipals;
2115: ret = SSH_ERR_ALLOC_FAIL;
2116: goto out;
2117: }
2118: key->cert->principals[key->cert->nprincipals++] = principal;
2119: }
2120:
1.4 djm 2121: /*
2122: * Stash a copies of the critical options and extensions sections
2123: * for later use.
2124: */
2125: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
2126: (exts != NULL &&
2127: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 2128: goto out;
2129:
1.4 djm 2130: /*
2131: * Validate critical options and extensions sections format.
2132: */
2133: while (sshbuf_len(crit) != 0) {
2134: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
2135: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
2136: sshbuf_reset(key->cert->critical);
1.1 djm 2137: ret = SSH_ERR_INVALID_FORMAT;
2138: goto out;
2139: }
2140: }
1.4 djm 2141: while (exts != NULL && sshbuf_len(exts) != 0) {
2142: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
2143: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
2144: sshbuf_reset(key->cert->extensions);
1.1 djm 2145: ret = SSH_ERR_INVALID_FORMAT;
2146: goto out;
2147: }
2148: }
2149:
1.4 djm 2150: /* Parse CA key and check signature */
1.14 djm 2151: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 2152: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2153: goto out;
2154: }
2155: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
2156: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2157: goto out;
2158: }
2159: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 2160: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 2161: goto out;
1.82 djm 2162: if ((ret = sshkey_get_sigtype(sig, slen,
2163: &key->cert->signature_type)) != 0)
1.67 djm 2164: goto out;
1.4 djm 2165:
2166: /* Success */
1.1 djm 2167: ret = 0;
2168: out:
1.14 djm 2169: sshbuf_free(ca);
1.4 djm 2170: sshbuf_free(crit);
2171: sshbuf_free(exts);
2172: sshbuf_free(principals);
1.1 djm 2173: free(sig);
2174: return ret;
2175: }
2176:
1.83 ! djm 2177: #ifdef WITH_OPENSSL
1.1 djm 2178: static int
1.69 djm 2179: check_rsa_length(const RSA *rsa)
2180: {
2181: const BIGNUM *rsa_n;
2182:
2183: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
2184: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
2185: return SSH_ERR_KEY_LENGTH;
2186: return 0;
2187: }
1.83 ! djm 2188: #endif /* WITH_OPENSSL */
1.69 djm 2189:
2190: static int
1.14 djm 2191: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
2192: int allow_cert)
1.1 djm 2193: {
1.12 djm 2194: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 2195: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2196: struct sshkey *key = NULL;
2197: size_t len;
2198: u_char *pk = NULL;
1.14 djm 2199: struct sshbuf *copy;
1.1 djm 2200: #ifdef WITH_OPENSSL
2201: EC_POINT *q = NULL;
1.69 djm 2202: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
2203: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 2204: #endif /* WITH_OPENSSL */
2205:
2206: #ifdef DEBUG_PK /* XXX */
1.14 djm 2207: sshbuf_dump(b, stderr);
1.1 djm 2208: #endif
1.32 djm 2209: if (keyp != NULL)
2210: *keyp = NULL;
1.14 djm 2211: if ((copy = sshbuf_fromb(b)) == NULL) {
2212: ret = SSH_ERR_ALLOC_FAIL;
2213: goto out;
2214: }
1.1 djm 2215: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2216: ret = SSH_ERR_INVALID_FORMAT;
2217: goto out;
2218: }
2219:
2220: type = sshkey_type_from_name(ktype);
2221: if (!allow_cert && sshkey_type_is_cert(type)) {
2222: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2223: goto out;
2224: }
2225: switch (type) {
2226: #ifdef WITH_OPENSSL
2227: case KEY_RSA_CERT:
1.14 djm 2228: /* Skip nonce */
1.1 djm 2229: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2230: ret = SSH_ERR_INVALID_FORMAT;
2231: goto out;
2232: }
2233: /* FALLTHROUGH */
2234: case KEY_RSA:
2235: if ((key = sshkey_new(type)) == NULL) {
2236: ret = SSH_ERR_ALLOC_FAIL;
2237: goto out;
2238: }
1.73 djm 2239: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2240: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2241: ret = SSH_ERR_INVALID_FORMAT;
2242: goto out;
2243: }
1.69 djm 2244: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2245: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2246: goto out;
2247: }
1.69 djm 2248: rsa_n = rsa_e = NULL; /* transferred */
2249: if ((ret = check_rsa_length(key->rsa)) != 0)
2250: goto out;
1.1 djm 2251: #ifdef DEBUG_PK
2252: RSA_print_fp(stderr, key->rsa, 8);
2253: #endif
2254: break;
2255: case KEY_DSA_CERT:
1.14 djm 2256: /* Skip nonce */
1.1 djm 2257: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2258: ret = SSH_ERR_INVALID_FORMAT;
2259: goto out;
2260: }
2261: /* FALLTHROUGH */
2262: case KEY_DSA:
2263: if ((key = sshkey_new(type)) == NULL) {
2264: ret = SSH_ERR_ALLOC_FAIL;
2265: goto out;
2266: }
1.73 djm 2267: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2268: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2269: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2270: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2271: ret = SSH_ERR_INVALID_FORMAT;
2272: goto out;
2273: }
1.69 djm 2274: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2275: ret = SSH_ERR_LIBCRYPTO_ERROR;
2276: goto out;
2277: }
2278: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2279: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2280: ret = SSH_ERR_LIBCRYPTO_ERROR;
2281: goto out;
2282: }
2283: dsa_pub_key = NULL; /* transferred */
1.1 djm 2284: #ifdef DEBUG_PK
2285: DSA_print_fp(stderr, key->dsa, 8);
2286: #endif
2287: break;
2288: case KEY_ECDSA_CERT:
1.14 djm 2289: /* Skip nonce */
1.1 djm 2290: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2291: ret = SSH_ERR_INVALID_FORMAT;
2292: goto out;
2293: }
2294: /* FALLTHROUGH */
2295: case KEY_ECDSA:
2296: if ((key = sshkey_new(type)) == NULL) {
2297: ret = SSH_ERR_ALLOC_FAIL;
2298: goto out;
2299: }
1.12 djm 2300: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2301: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2302: ret = SSH_ERR_INVALID_FORMAT;
2303: goto out;
2304: }
2305: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2306: ret = SSH_ERR_EC_CURVE_MISMATCH;
2307: goto out;
2308: }
1.60 jsing 2309: EC_KEY_free(key->ecdsa);
1.1 djm 2310: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2311: == NULL) {
2312: ret = SSH_ERR_EC_CURVE_INVALID;
2313: goto out;
2314: }
2315: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2316: ret = SSH_ERR_ALLOC_FAIL;
2317: goto out;
2318: }
2319: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2320: ret = SSH_ERR_INVALID_FORMAT;
2321: goto out;
2322: }
2323: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2324: q) != 0) {
2325: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2326: goto out;
2327: }
2328: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2329: /* XXX assume it is a allocation error */
2330: ret = SSH_ERR_ALLOC_FAIL;
2331: goto out;
2332: }
2333: #ifdef DEBUG_PK
2334: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2335: #endif
2336: break;
2337: #endif /* WITH_OPENSSL */
2338: case KEY_ED25519_CERT:
1.14 djm 2339: /* Skip nonce */
1.1 djm 2340: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2341: ret = SSH_ERR_INVALID_FORMAT;
2342: goto out;
2343: }
2344: /* FALLTHROUGH */
2345: case KEY_ED25519:
2346: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2347: goto out;
2348: if (len != ED25519_PK_SZ) {
2349: ret = SSH_ERR_INVALID_FORMAT;
2350: goto out;
2351: }
2352: if ((key = sshkey_new(type)) == NULL) {
2353: ret = SSH_ERR_ALLOC_FAIL;
2354: goto out;
2355: }
2356: key->ed25519_pk = pk;
2357: pk = NULL;
2358: break;
1.62 markus 2359: #ifdef WITH_XMSS
2360: case KEY_XMSS_CERT:
2361: /* Skip nonce */
2362: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2363: ret = SSH_ERR_INVALID_FORMAT;
2364: goto out;
2365: }
2366: /* FALLTHROUGH */
2367: case KEY_XMSS:
2368: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2369: goto out;
2370: if ((key = sshkey_new(type)) == NULL) {
2371: ret = SSH_ERR_ALLOC_FAIL;
2372: goto out;
2373: }
2374: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2375: goto out;
2376: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2377: goto out;
2378: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2379: ret = SSH_ERR_INVALID_FORMAT;
2380: goto out;
2381: }
2382: key->xmss_pk = pk;
2383: pk = NULL;
2384: if (type != KEY_XMSS_CERT &&
2385: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2386: goto out;
2387: break;
2388: #endif /* WITH_XMSS */
1.1 djm 2389: case KEY_UNSPEC:
2390: default:
2391: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2392: goto out;
2393: }
2394:
2395: /* Parse certificate potion */
1.14 djm 2396: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2397: goto out;
2398:
2399: if (key != NULL && sshbuf_len(b) != 0) {
2400: ret = SSH_ERR_INVALID_FORMAT;
2401: goto out;
2402: }
2403: ret = 0;
1.32 djm 2404: if (keyp != NULL) {
2405: *keyp = key;
2406: key = NULL;
2407: }
1.1 djm 2408: out:
1.14 djm 2409: sshbuf_free(copy);
1.1 djm 2410: sshkey_free(key);
1.62 markus 2411: free(xmss_name);
1.1 djm 2412: free(ktype);
2413: free(curve);
2414: free(pk);
2415: #ifdef WITH_OPENSSL
1.60 jsing 2416: EC_POINT_free(q);
1.69 djm 2417: BN_clear_free(rsa_n);
2418: BN_clear_free(rsa_e);
2419: BN_clear_free(dsa_p);
2420: BN_clear_free(dsa_q);
2421: BN_clear_free(dsa_g);
2422: BN_clear_free(dsa_pub_key);
1.1 djm 2423: #endif /* WITH_OPENSSL */
2424: return ret;
2425: }
2426:
2427: int
2428: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2429: {
1.14 djm 2430: struct sshbuf *b;
2431: int r;
2432:
2433: if ((b = sshbuf_from(blob, blen)) == NULL)
2434: return SSH_ERR_ALLOC_FAIL;
2435: r = sshkey_from_blob_internal(b, keyp, 1);
2436: sshbuf_free(b);
2437: return r;
2438: }
2439:
2440: int
2441: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2442: {
2443: return sshkey_from_blob_internal(b, keyp, 1);
2444: }
2445:
2446: int
2447: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2448: {
2449: struct sshbuf *b;
2450: int r;
2451:
2452: if ((r = sshbuf_froms(buf, &b)) != 0)
2453: return r;
2454: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2455: sshbuf_free(b);
2456: return r;
2457: }
2458:
1.82 djm 2459: int
2460: sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2461: {
2462: int r;
2463: struct sshbuf *b = NULL;
2464: char *sigtype = NULL;
2465:
2466: if (sigtypep != NULL)
2467: *sigtypep = NULL;
2468: if ((b = sshbuf_from(sig, siglen)) == NULL)
2469: return SSH_ERR_ALLOC_FAIL;
2470: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2471: goto out;
2472: /* success */
2473: if (sigtypep != NULL) {
2474: *sigtypep = sigtype;
2475: sigtype = NULL;
2476: }
2477: r = 0;
2478: out:
2479: free(sigtype);
1.14 djm 2480: sshbuf_free(b);
2481: return r;
1.68 djm 2482: }
2483:
2484: /*
2485: *
2486: * Checks whether a certificate's signature type is allowed.
2487: * Returns 0 (success) if the certificate signature type appears in the
2488: * "allowed" pattern-list, or the key is not a certificate to begin with.
2489: * Otherwise returns a ssherr.h code.
2490: */
2491: int
2492: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2493: {
2494: if (key == NULL || allowed == NULL)
2495: return SSH_ERR_INVALID_ARGUMENT;
2496: if (!sshkey_type_is_cert(key->type))
2497: return 0;
2498: if (key->cert == NULL || key->cert->signature_type == NULL)
2499: return SSH_ERR_INVALID_ARGUMENT;
2500: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2501: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2502: return 0;
1.65 djm 2503: }
2504:
2505: /*
2506: * Returns the expected signature algorithm for a given public key algorithm.
2507: */
1.66 djm 2508: const char *
2509: sshkey_sigalg_by_name(const char *name)
1.65 djm 2510: {
2511: const struct keytype *kt;
2512:
2513: for (kt = keytypes; kt->type != -1; kt++) {
2514: if (strcmp(kt->name, name) != 0)
2515: continue;
2516: if (kt->sigalg != NULL)
2517: return kt->sigalg;
2518: if (!kt->cert)
2519: return kt->name;
2520: return sshkey_ssh_name_from_type_nid(
2521: sshkey_type_plain(kt->type), kt->nid);
2522: }
2523: return NULL;
2524: }
2525:
2526: /*
2527: * Verifies that the signature algorithm appearing inside the signature blob
2528: * matches that which was requested.
2529: */
2530: int
2531: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2532: const char *requested_alg)
2533: {
2534: const char *expected_alg;
2535: char *sigtype = NULL;
2536: int r;
2537:
2538: if (requested_alg == NULL)
2539: return 0;
1.66 djm 2540: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2541: return SSH_ERR_INVALID_ARGUMENT;
1.82 djm 2542: if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
1.65 djm 2543: return r;
2544: r = strcmp(expected_alg, sigtype) == 0;
2545: free(sigtype);
2546: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2547: }
2548:
2549: int
1.76 djm 2550: sshkey_sign(struct sshkey *key,
1.1 djm 2551: u_char **sigp, size_t *lenp,
1.28 markus 2552: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2553: {
1.76 djm 2554: int was_shielded = sshkey_is_shielded(key);
2555: int r2, r = SSH_ERR_INTERNAL_ERROR;
2556:
1.1 djm 2557: if (sigp != NULL)
2558: *sigp = NULL;
2559: if (lenp != NULL)
2560: *lenp = 0;
2561: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2562: return SSH_ERR_INVALID_ARGUMENT;
1.76 djm 2563: if ((r = sshkey_unshield_private(key)) != 0)
2564: return r;
1.1 djm 2565: switch (key->type) {
2566: #ifdef WITH_OPENSSL
2567: case KEY_DSA_CERT:
2568: case KEY_DSA:
1.76 djm 2569: r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2570: break;
1.1 djm 2571: case KEY_ECDSA_CERT:
2572: case KEY_ECDSA:
1.76 djm 2573: r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2574: break;
1.1 djm 2575: case KEY_RSA_CERT:
2576: case KEY_RSA:
1.76 djm 2577: r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
2578: break;
1.1 djm 2579: #endif /* WITH_OPENSSL */
2580: case KEY_ED25519:
2581: case KEY_ED25519_CERT:
1.76 djm 2582: r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2583: break;
1.62 markus 2584: #ifdef WITH_XMSS
2585: case KEY_XMSS:
2586: case KEY_XMSS_CERT:
1.76 djm 2587: r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2588: break;
1.62 markus 2589: #endif /* WITH_XMSS */
1.1 djm 2590: default:
1.76 djm 2591: r = SSH_ERR_KEY_TYPE_UNKNOWN;
2592: break;
1.1 djm 2593: }
1.76 djm 2594: if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2595: return r2;
2596: return r;
1.1 djm 2597: }
2598:
2599: /*
2600: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2601: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2602: */
2603: int
2604: sshkey_verify(const struct sshkey *key,
2605: const u_char *sig, size_t siglen,
1.59 djm 2606: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2607: {
1.6 djm 2608: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2609: return SSH_ERR_INVALID_ARGUMENT;
2610: switch (key->type) {
2611: #ifdef WITH_OPENSSL
2612: case KEY_DSA_CERT:
2613: case KEY_DSA:
2614: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2615: case KEY_ECDSA_CERT:
2616: case KEY_ECDSA:
2617: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2618: case KEY_RSA_CERT:
2619: case KEY_RSA:
1.59 djm 2620: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2621: #endif /* WITH_OPENSSL */
2622: case KEY_ED25519:
2623: case KEY_ED25519_CERT:
2624: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.62 markus 2625: #ifdef WITH_XMSS
2626: case KEY_XMSS:
2627: case KEY_XMSS_CERT:
2628: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2629: #endif /* WITH_XMSS */
1.1 djm 2630: default:
2631: return SSH_ERR_KEY_TYPE_UNKNOWN;
2632: }
2633: }
2634:
2635: /* Convert a plain key to their _CERT equivalent */
2636: int
1.20 djm 2637: sshkey_to_certified(struct sshkey *k)
1.1 djm 2638: {
2639: int newtype;
2640:
2641: switch (k->type) {
2642: #ifdef WITH_OPENSSL
2643: case KEY_RSA:
1.20 djm 2644: newtype = KEY_RSA_CERT;
1.1 djm 2645: break;
2646: case KEY_DSA:
1.20 djm 2647: newtype = KEY_DSA_CERT;
1.1 djm 2648: break;
2649: case KEY_ECDSA:
2650: newtype = KEY_ECDSA_CERT;
2651: break;
2652: #endif /* WITH_OPENSSL */
2653: case KEY_ED25519:
2654: newtype = KEY_ED25519_CERT;
2655: break;
1.62 markus 2656: #ifdef WITH_XMSS
2657: case KEY_XMSS:
2658: newtype = KEY_XMSS_CERT;
2659: break;
2660: #endif /* WITH_XMSS */
1.1 djm 2661: default:
2662: return SSH_ERR_INVALID_ARGUMENT;
2663: }
2664: if ((k->cert = cert_new()) == NULL)
2665: return SSH_ERR_ALLOC_FAIL;
2666: k->type = newtype;
2667: return 0;
2668: }
2669:
2670: /* Convert a certificate to its raw key equivalent */
2671: int
2672: sshkey_drop_cert(struct sshkey *k)
2673: {
2674: if (!sshkey_type_is_cert(k->type))
2675: return SSH_ERR_KEY_TYPE_UNKNOWN;
2676: cert_free(k->cert);
2677: k->cert = NULL;
2678: k->type = sshkey_type_plain(k->type);
2679: return 0;
2680: }
2681:
2682: /* Sign a certified key, (re-)generating the signed certblob. */
2683: int
1.53 djm 2684: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2685: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2686: {
2687: struct sshbuf *principals = NULL;
2688: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2689: size_t i, ca_len, sig_len;
2690: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2691: struct sshbuf *cert = NULL;
2692: char *sigtype = NULL;
1.69 djm 2693: #ifdef WITH_OPENSSL
2694: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2695: #endif /* WITH_OPENSSL */
1.1 djm 2696:
2697: if (k == NULL || k->cert == NULL ||
2698: k->cert->certblob == NULL || ca == NULL)
2699: return SSH_ERR_INVALID_ARGUMENT;
2700: if (!sshkey_is_cert(k))
2701: return SSH_ERR_KEY_TYPE_UNKNOWN;
2702: if (!sshkey_type_is_valid_ca(ca->type))
2703: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2704:
1.67 djm 2705: /*
2706: * If no alg specified as argument but a signature_type was set,
2707: * then prefer that. If both were specified, then they must match.
2708: */
2709: if (alg == NULL)
2710: alg = k->cert->signature_type;
2711: else if (k->cert->signature_type != NULL &&
2712: strcmp(alg, k->cert->signature_type) != 0)
2713: return SSH_ERR_INVALID_ARGUMENT;
1.75 djm 2714:
2715: /*
2716: * If no signing algorithm or signature_type was specified and we're
2717: * using a RSA key, then default to a good signature algorithm.
2718: */
2719: if (alg == NULL && ca->type == KEY_RSA)
2720: alg = "rsa-sha2-512";
1.67 djm 2721:
1.1 djm 2722: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2723: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2724:
2725: cert = k->cert->certblob; /* for readability */
2726: sshbuf_reset(cert);
2727: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2728: goto out;
2729:
2730: /* -v01 certs put nonce first */
2731: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2732: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2733: goto out;
1.1 djm 2734:
2735: /* XXX this substantially duplicates to_blob(); refactor */
2736: switch (k->type) {
2737: #ifdef WITH_OPENSSL
2738: case KEY_DSA_CERT:
1.69 djm 2739: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2740: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2741: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2742: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2743: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2744: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2745: goto out;
2746: break;
2747: case KEY_ECDSA_CERT:
2748: if ((ret = sshbuf_put_cstring(cert,
2749: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2750: (ret = sshbuf_put_ec(cert,
2751: EC_KEY_get0_public_key(k->ecdsa),
2752: EC_KEY_get0_group(k->ecdsa))) != 0)
2753: goto out;
2754: break;
2755: case KEY_RSA_CERT:
1.69 djm 2756: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2757: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2758: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2759: goto out;
2760: break;
2761: #endif /* WITH_OPENSSL */
2762: case KEY_ED25519_CERT:
2763: if ((ret = sshbuf_put_string(cert,
2764: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2765: goto out;
2766: break;
1.62 markus 2767: #ifdef WITH_XMSS
2768: case KEY_XMSS_CERT:
2769: if (k->xmss_name == NULL) {
2770: ret = SSH_ERR_INVALID_ARGUMENT;
2771: goto out;
2772: }
2773: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2774: (ret = sshbuf_put_string(cert,
2775: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2776: goto out;
2777: break;
2778: #endif /* WITH_XMSS */
1.1 djm 2779: default:
2780: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2781: goto out;
1.1 djm 2782: }
2783:
1.20 djm 2784: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2785: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2786: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2787: goto out;
2788:
2789: if ((principals = sshbuf_new()) == NULL) {
2790: ret = SSH_ERR_ALLOC_FAIL;
2791: goto out;
2792: }
2793: for (i = 0; i < k->cert->nprincipals; i++) {
2794: if ((ret = sshbuf_put_cstring(principals,
2795: k->cert->principals[i])) != 0)
2796: goto out;
2797: }
2798: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2799: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2800: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2801: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2802: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2803: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2804: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2805: goto out;
2806:
2807: /* Sign the whole mess */
1.53 djm 2808: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2809: sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
1.1 djm 2810: goto out;
1.67 djm 2811: /* Check and update signature_type against what was actually used */
1.82 djm 2812: if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
1.67 djm 2813: goto out;
2814: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2815: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2816: goto out;
2817: }
2818: if (k->cert->signature_type == NULL) {
2819: k->cert->signature_type = sigtype;
2820: sigtype = NULL;
2821: }
1.1 djm 2822: /* Append signature and we are done */
2823: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2824: goto out;
2825: ret = 0;
2826: out:
2827: if (ret != 0)
2828: sshbuf_reset(cert);
1.29 mmcc 2829: free(sig_blob);
2830: free(ca_blob);
1.67 djm 2831: free(sigtype);
1.31 mmcc 2832: sshbuf_free(principals);
1.1 djm 2833: return ret;
1.53 djm 2834: }
2835:
2836: static int
1.76 djm 2837: default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
1.53 djm 2838: const u_char *data, size_t datalen,
2839: const char *alg, u_int compat, void *ctx)
2840: {
2841: if (ctx != NULL)
2842: return SSH_ERR_INVALID_ARGUMENT;
2843: return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2844: }
2845:
2846: int
2847: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2848: {
2849: return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
1.1 djm 2850: }
2851:
2852: int
2853: sshkey_cert_check_authority(const struct sshkey *k,
2854: int want_host, int require_principal,
2855: const char *name, const char **reason)
2856: {
2857: u_int i, principal_matches;
2858: time_t now = time(NULL);
2859:
2860: if (reason != NULL)
2861: *reason = NULL;
2862:
2863: if (want_host) {
2864: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2865: *reason = "Certificate invalid: not a host certificate";
2866: return SSH_ERR_KEY_CERT_INVALID;
2867: }
2868: } else {
2869: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2870: *reason = "Certificate invalid: not a user certificate";
2871: return SSH_ERR_KEY_CERT_INVALID;
2872: }
2873: }
2874: if (now < 0) {
2875: /* yikes - system clock before epoch! */
2876: *reason = "Certificate invalid: not yet valid";
2877: return SSH_ERR_KEY_CERT_INVALID;
2878: }
2879: if ((u_int64_t)now < k->cert->valid_after) {
2880: *reason = "Certificate invalid: not yet valid";
2881: return SSH_ERR_KEY_CERT_INVALID;
2882: }
2883: if ((u_int64_t)now >= k->cert->valid_before) {
2884: *reason = "Certificate invalid: expired";
2885: return SSH_ERR_KEY_CERT_INVALID;
2886: }
2887: if (k->cert->nprincipals == 0) {
2888: if (require_principal) {
2889: *reason = "Certificate lacks principal list";
2890: return SSH_ERR_KEY_CERT_INVALID;
2891: }
2892: } else if (name != NULL) {
2893: principal_matches = 0;
2894: for (i = 0; i < k->cert->nprincipals; i++) {
2895: if (strcmp(name, k->cert->principals[i]) == 0) {
2896: principal_matches = 1;
2897: break;
2898: }
2899: }
2900: if (!principal_matches) {
2901: *reason = "Certificate invalid: name is not a listed "
2902: "principal";
2903: return SSH_ERR_KEY_CERT_INVALID;
2904: }
2905: }
2906: return 0;
1.27 djm 2907: }
2908:
2909: size_t
2910: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2911: {
2912: char from[32], to[32], ret[64];
2913: time_t tt;
2914: struct tm *tm;
2915:
2916: *from = *to = '\0';
2917: if (cert->valid_after == 0 &&
2918: cert->valid_before == 0xffffffffffffffffULL)
2919: return strlcpy(s, "forever", l);
2920:
2921: if (cert->valid_after != 0) {
2922: /* XXX revisit INT_MAX in 2038 :) */
2923: tt = cert->valid_after > INT_MAX ?
2924: INT_MAX : cert->valid_after;
2925: tm = localtime(&tt);
2926: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2927: }
2928: if (cert->valid_before != 0xffffffffffffffffULL) {
2929: /* XXX revisit INT_MAX in 2038 :) */
2930: tt = cert->valid_before > INT_MAX ?
2931: INT_MAX : cert->valid_before;
2932: tm = localtime(&tt);
2933: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2934: }
2935:
2936: if (cert->valid_after == 0)
2937: snprintf(ret, sizeof(ret), "before %s", to);
2938: else if (cert->valid_before == 0xffffffffffffffffULL)
2939: snprintf(ret, sizeof(ret), "after %s", from);
2940: else
2941: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2942:
2943: return strlcpy(s, ret, l);
1.1 djm 2944: }
2945:
2946: int
1.76 djm 2947: sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
1.62 markus 2948: enum sshkey_serialize_rep opts)
1.1 djm 2949: {
2950: int r = SSH_ERR_INTERNAL_ERROR;
1.76 djm 2951: int was_shielded = sshkey_is_shielded(key);
2952: struct sshbuf *b = NULL;
1.69 djm 2953: #ifdef WITH_OPENSSL
2954: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2955: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2956: #endif /* WITH_OPENSSL */
1.1 djm 2957:
1.76 djm 2958: if ((r = sshkey_unshield_private(key)) != 0)
2959: return r;
2960: if ((b = sshbuf_new()) == NULL)
2961: return SSH_ERR_ALLOC_FAIL;
1.1 djm 2962: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2963: goto out;
2964: switch (key->type) {
2965: #ifdef WITH_OPENSSL
2966: case KEY_RSA:
1.69 djm 2967: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2968: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2969: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2970: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2971: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2972: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2973: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2974: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2975: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2976: goto out;
2977: break;
2978: case KEY_RSA_CERT:
2979: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2980: r = SSH_ERR_INVALID_ARGUMENT;
2981: goto out;
2982: }
1.69 djm 2983: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2984: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2985: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2986: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2987: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2988: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2989: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2990: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2991: goto out;
2992: break;
2993: case KEY_DSA:
1.69 djm 2994: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2995: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2996: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2997: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2998: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2999: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
3000: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3001: goto out;
3002: break;
3003: case KEY_DSA_CERT:
3004: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3005: r = SSH_ERR_INVALID_ARGUMENT;
3006: goto out;
3007: }
1.69 djm 3008: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 3009: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 3010: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 3011: goto out;
3012: break;
3013: case KEY_ECDSA:
3014: if ((r = sshbuf_put_cstring(b,
3015: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
3016: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
3017: (r = sshbuf_put_bignum2(b,
3018: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3019: goto out;
3020: break;
3021: case KEY_ECDSA_CERT:
3022: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3023: r = SSH_ERR_INVALID_ARGUMENT;
3024: goto out;
3025: }
3026: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3027: (r = sshbuf_put_bignum2(b,
3028: EC_KEY_get0_private_key(key->ecdsa))) != 0)
3029: goto out;
3030: break;
3031: #endif /* WITH_OPENSSL */
3032: case KEY_ED25519:
3033: if ((r = sshbuf_put_string(b, key->ed25519_pk,
3034: ED25519_PK_SZ)) != 0 ||
3035: (r = sshbuf_put_string(b, key->ed25519_sk,
3036: ED25519_SK_SZ)) != 0)
3037: goto out;
3038: break;
3039: case KEY_ED25519_CERT:
3040: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
3041: r = SSH_ERR_INVALID_ARGUMENT;
3042: goto out;
3043: }
3044: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3045: (r = sshbuf_put_string(b, key->ed25519_pk,
3046: ED25519_PK_SZ)) != 0 ||
3047: (r = sshbuf_put_string(b, key->ed25519_sk,
3048: ED25519_SK_SZ)) != 0)
3049: goto out;
3050: break;
1.62 markus 3051: #ifdef WITH_XMSS
3052: case KEY_XMSS:
3053: if (key->xmss_name == NULL) {
3054: r = SSH_ERR_INVALID_ARGUMENT;
3055: goto out;
3056: }
3057: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3058: (r = sshbuf_put_string(b, key->xmss_pk,
3059: sshkey_xmss_pklen(key))) != 0 ||
3060: (r = sshbuf_put_string(b, key->xmss_sk,
3061: sshkey_xmss_sklen(key))) != 0 ||
3062: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3063: goto out;
3064: break;
3065: case KEY_XMSS_CERT:
3066: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
3067: key->xmss_name == NULL) {
3068: r = SSH_ERR_INVALID_ARGUMENT;
3069: goto out;
3070: }
3071: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
3072: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
3073: (r = sshbuf_put_string(b, key->xmss_pk,
3074: sshkey_xmss_pklen(key))) != 0 ||
3075: (r = sshbuf_put_string(b, key->xmss_sk,
3076: sshkey_xmss_sklen(key))) != 0 ||
3077: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
3078: goto out;
3079: break;
3080: #endif /* WITH_XMSS */
1.1 djm 3081: default:
3082: r = SSH_ERR_INVALID_ARGUMENT;
3083: goto out;
3084: }
1.76 djm 3085: /*
3086: * success (but we still need to append the output to buf after
3087: * possibly re-shielding the private key)
3088: */
1.1 djm 3089: r = 0;
3090: out:
1.76 djm 3091: if (was_shielded)
3092: r = sshkey_shield_private(key);
3093: if (r == 0)
3094: r = sshbuf_putb(buf, b);
3095: sshbuf_free(b);
3096:
1.1 djm 3097: return r;
3098: }
3099:
3100: int
1.76 djm 3101: sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
1.62 markus 3102: {
3103: return sshkey_private_serialize_opt(key, b,
3104: SSHKEY_SERIALIZE_DEFAULT);
3105: }
3106:
3107: int
1.1 djm 3108: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
3109: {
1.62 markus 3110: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 3111: struct sshkey *k = NULL;
1.14 djm 3112: size_t pklen = 0, sklen = 0;
1.1 djm 3113: int type, r = SSH_ERR_INTERNAL_ERROR;
3114: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 3115: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 3116: #ifdef WITH_OPENSSL
3117: BIGNUM *exponent = NULL;
1.69 djm 3118: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
3119: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
3120: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
3121: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 3122: #endif /* WITH_OPENSSL */
3123:
3124: if (kp != NULL)
3125: *kp = NULL;
3126: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
3127: goto out;
3128: type = sshkey_type_from_name(tname);
3129: switch (type) {
3130: #ifdef WITH_OPENSSL
3131: case KEY_DSA:
1.70 djm 3132: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3133: r = SSH_ERR_ALLOC_FAIL;
3134: goto out;
3135: }
1.73 djm 3136: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
3137: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
3138: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
3139: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
3140: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 3141: goto out;
3142: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
3143: r = SSH_ERR_LIBCRYPTO_ERROR;
3144: goto out;
3145: }
3146: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
3147: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
3148: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 3149: goto out;
1.69 djm 3150: }
3151: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 3152: break;
3153: case KEY_DSA_CERT:
1.14 djm 3154: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3155: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 3156: goto out;
1.69 djm 3157: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
3158: r = SSH_ERR_LIBCRYPTO_ERROR;
3159: goto out;
3160: }
3161: dsa_priv_key = NULL; /* transferred */
1.1 djm 3162: break;
3163: case KEY_ECDSA:
1.70 djm 3164: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3165: r = SSH_ERR_ALLOC_FAIL;
3166: goto out;
3167: }
3168: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
3169: r = SSH_ERR_INVALID_ARGUMENT;
3170: goto out;
3171: }
3172: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
3173: goto out;
3174: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
3175: r = SSH_ERR_EC_CURVE_MISMATCH;
3176: goto out;
3177: }
3178: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 3179: if (k->ecdsa == NULL) {
1.1 djm 3180: r = SSH_ERR_LIBCRYPTO_ERROR;
3181: goto out;
3182: }
3183: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 3184: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 3185: goto out;
3186: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3187: r = SSH_ERR_LIBCRYPTO_ERROR;
3188: goto out;
3189: }
3190: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3191: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3192: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3193: goto out;
3194: break;
3195: case KEY_ECDSA_CERT:
1.14 djm 3196: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3197: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 3198: goto out;
3199: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
3200: r = SSH_ERR_LIBCRYPTO_ERROR;
3201: goto out;
3202: }
3203: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 3204: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 3205: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
3206: goto out;
3207: break;
3208: case KEY_RSA:
1.70 djm 3209: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3210: r = SSH_ERR_ALLOC_FAIL;
3211: goto out;
3212: }
1.73 djm 3213: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
3214: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
3215: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3216: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3217: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3218: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3219: goto out;
1.69 djm 3220: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
3221: r = SSH_ERR_LIBCRYPTO_ERROR;
3222: goto out;
3223: }
3224: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3225: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3226: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3227: goto out;
3228: }
1.69 djm 3229: rsa_p = rsa_q = NULL; /* transferred */
3230: if ((r = check_rsa_length(k->rsa)) != 0)
3231: goto out;
3232: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3233: goto out;
1.1 djm 3234: break;
3235: case KEY_RSA_CERT:
1.14 djm 3236: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 3237: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
3238: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
3239: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
3240: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 3241: goto out;
1.69 djm 3242: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3243: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3244: goto out;
3245: }
1.69 djm 3246: rsa_d = NULL; /* transferred */
3247: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3248: r = SSH_ERR_LIBCRYPTO_ERROR;
3249: goto out;
3250: }
3251: rsa_p = rsa_q = NULL; /* transferred */
3252: if ((r = check_rsa_length(k->rsa)) != 0)
3253: goto out;
3254: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3255: goto out;
1.1 djm 3256: break;
3257: #endif /* WITH_OPENSSL */
3258: case KEY_ED25519:
1.70 djm 3259: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3260: r = SSH_ERR_ALLOC_FAIL;
3261: goto out;
3262: }
3263: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3264: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3265: goto out;
3266: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3267: r = SSH_ERR_INVALID_FORMAT;
3268: goto out;
3269: }
3270: k->ed25519_pk = ed25519_pk;
3271: k->ed25519_sk = ed25519_sk;
3272: ed25519_pk = ed25519_sk = NULL;
3273: break;
3274: case KEY_ED25519_CERT:
1.14 djm 3275: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3276: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3277: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3278: goto out;
3279: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3280: r = SSH_ERR_INVALID_FORMAT;
3281: goto out;
3282: }
3283: k->ed25519_pk = ed25519_pk;
3284: k->ed25519_sk = ed25519_sk;
3285: ed25519_pk = ed25519_sk = NULL;
3286: break;
1.62 markus 3287: #ifdef WITH_XMSS
3288: case KEY_XMSS:
1.70 djm 3289: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3290: r = SSH_ERR_ALLOC_FAIL;
3291: goto out;
3292: }
3293: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3294: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3295: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3296: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3297: goto out;
3298: if (pklen != sshkey_xmss_pklen(k) ||
3299: sklen != sshkey_xmss_sklen(k)) {
3300: r = SSH_ERR_INVALID_FORMAT;
3301: goto out;
3302: }
3303: k->xmss_pk = xmss_pk;
3304: k->xmss_sk = xmss_sk;
3305: xmss_pk = xmss_sk = NULL;
3306: /* optional internal state */
3307: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3308: goto out;
3309: break;
3310: case KEY_XMSS_CERT:
3311: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3312: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3313: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3314: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3315: goto out;
1.64 markus 3316: if (strcmp(xmss_name, k->xmss_name)) {
3317: r = SSH_ERR_INVALID_FORMAT;
3318: goto out;
3319: }
1.62 markus 3320: if (pklen != sshkey_xmss_pklen(k) ||
3321: sklen != sshkey_xmss_sklen(k)) {
3322: r = SSH_ERR_INVALID_FORMAT;
3323: goto out;
3324: }
3325: k->xmss_pk = xmss_pk;
3326: k->xmss_sk = xmss_sk;
3327: xmss_pk = xmss_sk = NULL;
3328: /* optional internal state */
3329: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3330: goto out;
3331: break;
3332: #endif /* WITH_XMSS */
1.1 djm 3333: default:
3334: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3335: goto out;
3336: }
3337: #ifdef WITH_OPENSSL
3338: /* enable blinding */
3339: switch (k->type) {
3340: case KEY_RSA:
3341: case KEY_RSA_CERT:
3342: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3343: r = SSH_ERR_LIBCRYPTO_ERROR;
3344: goto out;
3345: }
3346: break;
3347: }
3348: #endif /* WITH_OPENSSL */
3349: /* success */
3350: r = 0;
3351: if (kp != NULL) {
3352: *kp = k;
3353: k = NULL;
3354: }
3355: out:
3356: free(tname);
3357: free(curve);
3358: #ifdef WITH_OPENSSL
1.60 jsing 3359: BN_clear_free(exponent);
1.69 djm 3360: BN_clear_free(dsa_p);
3361: BN_clear_free(dsa_q);
3362: BN_clear_free(dsa_g);
3363: BN_clear_free(dsa_pub_key);
3364: BN_clear_free(dsa_priv_key);
3365: BN_clear_free(rsa_n);
3366: BN_clear_free(rsa_e);
3367: BN_clear_free(rsa_d);
3368: BN_clear_free(rsa_p);
3369: BN_clear_free(rsa_q);
3370: BN_clear_free(rsa_iqmp);
1.1 djm 3371: #endif /* WITH_OPENSSL */
3372: sshkey_free(k);
1.61 jsing 3373: freezero(ed25519_pk, pklen);
3374: freezero(ed25519_sk, sklen);
1.62 markus 3375: free(xmss_name);
3376: freezero(xmss_pk, pklen);
3377: freezero(xmss_sk, sklen);
1.1 djm 3378: return r;
3379: }
3380:
3381: #ifdef WITH_OPENSSL
3382: int
3383: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3384: {
3385: BN_CTX *bnctx;
3386: EC_POINT *nq = NULL;
3387: BIGNUM *order, *x, *y, *tmp;
3388: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3389:
3390: /*
3391: * NB. This assumes OpenSSL has already verified that the public
3392: * point lies on the curve. This is done by EC_POINT_oct2point()
3393: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3394: * reachable with public points not unmarshalled using
3395: * EC_POINT_oct2point then the caller will need to explicitly check.
3396: */
1.1 djm 3397:
3398: if ((bnctx = BN_CTX_new()) == NULL)
3399: return SSH_ERR_ALLOC_FAIL;
3400: BN_CTX_start(bnctx);
3401:
3402: /*
3403: * We shouldn't ever hit this case because bignum_get_ecpoint()
3404: * refuses to load GF2m points.
3405: */
3406: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3407: NID_X9_62_prime_field)
3408: goto out;
3409:
3410: /* Q != infinity */
3411: if (EC_POINT_is_at_infinity(group, public))
3412: goto out;
3413:
3414: if ((x = BN_CTX_get(bnctx)) == NULL ||
3415: (y = BN_CTX_get(bnctx)) == NULL ||
3416: (order = BN_CTX_get(bnctx)) == NULL ||
3417: (tmp = BN_CTX_get(bnctx)) == NULL) {
3418: ret = SSH_ERR_ALLOC_FAIL;
3419: goto out;
3420: }
3421:
3422: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3423: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3424: EC_POINT_get_affine_coordinates_GFp(group, public,
3425: x, y, bnctx) != 1) {
3426: ret = SSH_ERR_LIBCRYPTO_ERROR;
3427: goto out;
3428: }
3429: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3430: BN_num_bits(y) <= BN_num_bits(order) / 2)
3431: goto out;
3432:
3433: /* nQ == infinity (n == order of subgroup) */
3434: if ((nq = EC_POINT_new(group)) == NULL) {
3435: ret = SSH_ERR_ALLOC_FAIL;
3436: goto out;
3437: }
3438: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3439: ret = SSH_ERR_LIBCRYPTO_ERROR;
3440: goto out;
3441: }
3442: if (EC_POINT_is_at_infinity(group, nq) != 1)
3443: goto out;
3444:
3445: /* x < order - 1, y < order - 1 */
3446: if (!BN_sub(tmp, order, BN_value_one())) {
3447: ret = SSH_ERR_LIBCRYPTO_ERROR;
3448: goto out;
3449: }
3450: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3451: goto out;
3452: ret = 0;
3453: out:
3454: BN_CTX_free(bnctx);
1.60 jsing 3455: EC_POINT_free(nq);
1.1 djm 3456: return ret;
3457: }
3458:
3459: int
3460: sshkey_ec_validate_private(const EC_KEY *key)
3461: {
3462: BN_CTX *bnctx;
3463: BIGNUM *order, *tmp;
3464: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3465:
3466: if ((bnctx = BN_CTX_new()) == NULL)
3467: return SSH_ERR_ALLOC_FAIL;
3468: BN_CTX_start(bnctx);
3469:
3470: if ((order = BN_CTX_get(bnctx)) == NULL ||
3471: (tmp = BN_CTX_get(bnctx)) == NULL) {
3472: ret = SSH_ERR_ALLOC_FAIL;
3473: goto out;
3474: }
3475:
3476: /* log2(private) > log2(order)/2 */
3477: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3478: ret = SSH_ERR_LIBCRYPTO_ERROR;
3479: goto out;
3480: }
3481: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3482: BN_num_bits(order) / 2)
3483: goto out;
3484:
3485: /* private < order - 1 */
3486: if (!BN_sub(tmp, order, BN_value_one())) {
3487: ret = SSH_ERR_LIBCRYPTO_ERROR;
3488: goto out;
3489: }
3490: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3491: goto out;
3492: ret = 0;
3493: out:
3494: BN_CTX_free(bnctx);
3495: return ret;
3496: }
3497:
3498: void
3499: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3500: {
3501: BIGNUM *x, *y;
3502: BN_CTX *bnctx;
3503:
3504: if (point == NULL) {
3505: fputs("point=(NULL)\n", stderr);
3506: return;
3507: }
3508: if ((bnctx = BN_CTX_new()) == NULL) {
3509: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3510: return;
3511: }
3512: BN_CTX_start(bnctx);
3513: if ((x = BN_CTX_get(bnctx)) == NULL ||
3514: (y = BN_CTX_get(bnctx)) == NULL) {
3515: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3516: return;
3517: }
3518: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3519: NID_X9_62_prime_field) {
3520: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3521: return;
3522: }
3523: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3524: bnctx) != 1) {
3525: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3526: __func__);
3527: return;
3528: }
3529: fputs("x=", stderr);
3530: BN_print_fp(stderr, x);
3531: fputs("\ny=", stderr);
3532: BN_print_fp(stderr, y);
3533: fputs("\n", stderr);
3534: BN_CTX_free(bnctx);
3535: }
3536:
3537: void
3538: sshkey_dump_ec_key(const EC_KEY *key)
3539: {
3540: const BIGNUM *exponent;
3541:
3542: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3543: EC_KEY_get0_public_key(key));
3544: fputs("exponent=", stderr);
3545: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3546: fputs("(NULL)", stderr);
3547: else
3548: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3549: fputs("\n", stderr);
3550: }
3551: #endif /* WITH_OPENSSL */
3552:
3553: static int
1.76 djm 3554: sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
1.1 djm 3555: const char *passphrase, const char *comment, const char *ciphername,
3556: int rounds)
3557: {
1.4 djm 3558: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3559: u_char salt[SALT_LEN];
1.4 djm 3560: char *b64 = NULL;
1.1 djm 3561: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3562: u_int check;
3563: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3564: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3565: const struct sshcipher *cipher;
3566: const char *kdfname = KDFNAME;
3567: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3568:
3569: if (rounds <= 0)
3570: rounds = DEFAULT_ROUNDS;
3571: if (passphrase == NULL || !strlen(passphrase)) {
3572: ciphername = "none";
3573: kdfname = "none";
3574: } else if (ciphername == NULL)
3575: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3576: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3577: r = SSH_ERR_INVALID_ARGUMENT;
3578: goto out;
3579: }
3580:
3581: if ((kdf = sshbuf_new()) == NULL ||
3582: (encoded = sshbuf_new()) == NULL ||
3583: (encrypted = sshbuf_new()) == NULL) {
3584: r = SSH_ERR_ALLOC_FAIL;
3585: goto out;
3586: }
3587: blocksize = cipher_blocksize(cipher);
3588: keylen = cipher_keylen(cipher);
3589: ivlen = cipher_ivlen(cipher);
3590: authlen = cipher_authlen(cipher);
3591: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3592: r = SSH_ERR_ALLOC_FAIL;
3593: goto out;
3594: }
3595: if (strcmp(kdfname, "bcrypt") == 0) {
3596: arc4random_buf(salt, SALT_LEN);
3597: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3598: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3599: r = SSH_ERR_INVALID_ARGUMENT;
3600: goto out;
3601: }
3602: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3603: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3604: goto out;
3605: } else if (strcmp(kdfname, "none") != 0) {
3606: /* Unsupported KDF type */
3607: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3608: goto out;
3609: }
3610: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3611: key + keylen, ivlen, 1)) != 0)
3612: goto out;
3613:
3614: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3615: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3616: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3617: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3618: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3619: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3620: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3621: goto out;
3622:
3623: /* set up the buffer that will be encrypted */
3624:
3625: /* Random check bytes */
3626: check = arc4random();
3627: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3628: (r = sshbuf_put_u32(encrypted, check)) != 0)
3629: goto out;
3630:
3631: /* append private key and comment*/
1.62 markus 3632: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3633: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3634: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3635: goto out;
3636:
3637: /* padding */
3638: i = 0;
3639: while (sshbuf_len(encrypted) % blocksize) {
3640: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3641: goto out;
3642: }
3643:
3644: /* length in destination buffer */
3645: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3646: goto out;
3647:
3648: /* encrypt */
3649: if ((r = sshbuf_reserve(encoded,
3650: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3651: goto out;
1.36 djm 3652: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3653: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3654: goto out;
3655:
1.81 djm 3656: sshbuf_reset(blob);
1.1 djm 3657:
1.81 djm 3658: /* assemble uuencoded key */
3659: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
3660: (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
3661: (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
1.1 djm 3662: goto out;
3663:
3664: /* success */
3665: r = 0;
3666:
3667: out:
3668: sshbuf_free(kdf);
3669: sshbuf_free(encoded);
3670: sshbuf_free(encrypted);
1.36 djm 3671: cipher_free(ciphercontext);
1.1 djm 3672: explicit_bzero(salt, sizeof(salt));
3673: if (key != NULL) {
3674: explicit_bzero(key, keylen + ivlen);
3675: free(key);
3676: }
3677: if (pubkeyblob != NULL) {
3678: explicit_bzero(pubkeyblob, pubkeylen);
3679: free(pubkeyblob);
3680: }
3681: if (b64 != NULL) {
3682: explicit_bzero(b64, strlen(b64));
3683: free(b64);
3684: }
3685: return r;
3686: }
3687:
3688: static int
3689: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3690: struct sshkey **keyp, char **commentp)
3691: {
3692: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3693: const struct sshcipher *cipher = NULL;
3694: const u_char *cp;
3695: int r = SSH_ERR_INTERNAL_ERROR;
3696: size_t encoded_len;
1.18 djm 3697: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3698: struct sshbuf *encoded = NULL, *decoded = NULL;
3699: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3700: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3701: struct sshkey *k = NULL;
3702: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3703: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3704:
3705: if (keyp != NULL)
3706: *keyp = NULL;
3707: if (commentp != NULL)
3708: *commentp = NULL;
3709:
3710: if ((encoded = sshbuf_new()) == NULL ||
3711: (decoded = sshbuf_new()) == NULL ||
3712: (decrypted = sshbuf_new()) == NULL) {
3713: r = SSH_ERR_ALLOC_FAIL;
3714: goto out;
3715: }
3716:
3717: /* check preamble */
3718: cp = sshbuf_ptr(blob);
3719: encoded_len = sshbuf_len(blob);
3720: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3721: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3722: r = SSH_ERR_INVALID_FORMAT;
3723: goto out;
3724: }
3725: cp += MARK_BEGIN_LEN;
3726: encoded_len -= MARK_BEGIN_LEN;
3727:
3728: /* Look for end marker, removing whitespace as we go */
3729: while (encoded_len > 0) {
3730: if (*cp != '\n' && *cp != '\r') {
3731: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3732: goto out;
3733: }
3734: last = *cp;
3735: encoded_len--;
3736: cp++;
3737: if (last == '\n') {
3738: if (encoded_len >= MARK_END_LEN &&
3739: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3740: /* \0 terminate */
3741: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3742: goto out;
3743: break;
3744: }
3745: }
3746: }
3747: if (encoded_len == 0) {
3748: r = SSH_ERR_INVALID_FORMAT;
3749: goto out;
3750: }
3751:
3752: /* decode base64 */
1.4 djm 3753: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3754: goto out;
3755:
3756: /* check magic */
3757: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3758: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3759: r = SSH_ERR_INVALID_FORMAT;
3760: goto out;
3761: }
3762: /* parse public portion of key */
3763: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3764: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3765: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3766: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3767: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3768: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3769: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3770: goto out;
3771:
3772: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3773: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3774: goto out;
3775: }
3776: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3777: strcmp(ciphername, "none") != 0) {
3778: /* passphrase required */
3779: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3780: goto out;
3781: }
3782: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3783: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3784: goto out;
3785: }
3786: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3787: r = SSH_ERR_INVALID_FORMAT;
3788: goto out;
3789: }
3790: if (nkeys != 1) {
3791: /* XXX only one key supported */
3792: r = SSH_ERR_INVALID_FORMAT;
3793: goto out;
3794: }
3795:
3796: /* check size of encrypted key blob */
3797: blocksize = cipher_blocksize(cipher);
3798: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3799: r = SSH_ERR_INVALID_FORMAT;
3800: goto out;
3801: }
3802:
3803: /* setup key */
3804: keylen = cipher_keylen(cipher);
3805: ivlen = cipher_ivlen(cipher);
1.18 djm 3806: authlen = cipher_authlen(cipher);
1.1 djm 3807: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3808: r = SSH_ERR_ALLOC_FAIL;
3809: goto out;
3810: }
3811: if (strcmp(kdfname, "bcrypt") == 0) {
3812: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3813: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3814: goto out;
3815: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3816: key, keylen + ivlen, rounds) < 0) {
3817: r = SSH_ERR_INVALID_FORMAT;
3818: goto out;
3819: }
3820: }
3821:
1.18 djm 3822: /* check that an appropriate amount of auth data is present */
3823: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3824: r = SSH_ERR_INVALID_FORMAT;
3825: goto out;
3826: }
3827:
1.1 djm 3828: /* decrypt private portion of key */
3829: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3830: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3831: key + keylen, ivlen, 0)) != 0)
3832: goto out;
1.36 djm 3833: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3834: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3835: /* an integrity error here indicates an incorrect passphrase */
3836: if (r == SSH_ERR_MAC_INVALID)
3837: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3838: goto out;
3839: }
1.18 djm 3840: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3841: goto out;
3842: /* there should be no trailing data */
3843: if (sshbuf_len(decoded) != 0) {
3844: r = SSH_ERR_INVALID_FORMAT;
3845: goto out;
3846: }
3847:
3848: /* check check bytes */
3849: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3850: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3851: goto out;
3852: if (check1 != check2) {
3853: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3854: goto out;
3855: }
3856:
3857: /* Load the private key and comment */
3858: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3859: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3860: goto out;
3861:
3862: /* Check deterministic padding */
3863: i = 0;
3864: while (sshbuf_len(decrypted)) {
3865: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3866: goto out;
3867: if (pad != (++i & 0xff)) {
3868: r = SSH_ERR_INVALID_FORMAT;
3869: goto out;
3870: }
3871: }
3872:
3873: /* XXX decode pubkey and check against private */
3874:
3875: /* success */
3876: r = 0;
3877: if (keyp != NULL) {
3878: *keyp = k;
3879: k = NULL;
3880: }
3881: if (commentp != NULL) {
3882: *commentp = comment;
3883: comment = NULL;
3884: }
3885: out:
3886: pad = 0;
1.36 djm 3887: cipher_free(ciphercontext);
1.1 djm 3888: free(ciphername);
3889: free(kdfname);
3890: free(comment);
3891: if (salt != NULL) {
3892: explicit_bzero(salt, slen);
3893: free(salt);
3894: }
3895: if (key != NULL) {
3896: explicit_bzero(key, keylen + ivlen);
3897: free(key);
3898: }
3899: sshbuf_free(encoded);
3900: sshbuf_free(decoded);
3901: sshbuf_free(kdf);
3902: sshbuf_free(decrypted);
3903: sshkey_free(k);
3904: return r;
3905: }
3906:
3907:
3908: #ifdef WITH_OPENSSL
1.80 djm 3909: /* convert SSH v2 key to PEM or PKCS#8 format */
1.1 djm 3910: static int
1.80 djm 3911: sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
3912: int format, const char *_passphrase, const char *comment)
1.1 djm 3913: {
1.76 djm 3914: int was_shielded = sshkey_is_shielded(key);
1.1 djm 3915: int success, r;
3916: int blen, len = strlen(_passphrase);
3917: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3918: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3919: char *bptr;
1.1 djm 3920: BIO *bio = NULL;
1.76 djm 3921: struct sshbuf *blob;
1.80 djm 3922: EVP_PKEY *pkey = NULL;
1.1 djm 3923:
3924: if (len > 0 && len <= 4)
3925: return SSH_ERR_PASSPHRASE_TOO_SHORT;
1.76 djm 3926: if ((blob = sshbuf_new()) == NULL)
1.1 djm 3927: return SSH_ERR_ALLOC_FAIL;
1.76 djm 3928: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
1.80 djm 3929: r = SSH_ERR_ALLOC_FAIL;
3930: goto out;
3931: }
3932: if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
3933: r = SSH_ERR_ALLOC_FAIL;
3934: goto out;
1.76 djm 3935: }
3936: if ((r = sshkey_unshield_private(key)) != 0)
3937: goto out;
1.1 djm 3938:
3939: switch (key->type) {
3940: case KEY_DSA:
1.80 djm 3941: if (format == SSHKEY_PRIVATE_PEM) {
3942: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3943: cipher, passphrase, len, NULL, NULL);
3944: } else {
3945: success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3946: }
1.1 djm 3947: break;
3948: case KEY_ECDSA:
1.80 djm 3949: if (format == SSHKEY_PRIVATE_PEM) {
3950: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3951: cipher, passphrase, len, NULL, NULL);
3952: } else {
3953: success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3954: }
1.1 djm 3955: break;
3956: case KEY_RSA:
1.80 djm 3957: if (format == SSHKEY_PRIVATE_PEM) {
3958: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3959: cipher, passphrase, len, NULL, NULL);
3960: } else {
3961: success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3962: }
1.1 djm 3963: break;
3964: default:
3965: success = 0;
3966: break;
3967: }
3968: if (success == 0) {
3969: r = SSH_ERR_LIBCRYPTO_ERROR;
3970: goto out;
3971: }
1.80 djm 3972: if (format == SSHKEY_PRIVATE_PKCS8) {
3973: if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3974: passphrase, len, NULL, NULL)) == 0) {
3975: r = SSH_ERR_LIBCRYPTO_ERROR;
3976: goto out;
3977: }
3978: }
1.1 djm 3979: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3980: r = SSH_ERR_INTERNAL_ERROR;
3981: goto out;
3982: }
3983: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3984: goto out;
3985: r = 0;
3986: out:
1.76 djm 3987: if (was_shielded)
3988: r = sshkey_shield_private(key);
3989: if (r == 0)
3990: r = sshbuf_putb(buf, blob);
1.80 djm 3991:
3992: EVP_PKEY_free(pkey);
1.76 djm 3993: sshbuf_free(blob);
1.1 djm 3994: BIO_free(bio);
3995: return r;
3996: }
3997: #endif /* WITH_OPENSSL */
3998:
3999: /* Serialise "key" to buffer "blob" */
4000: int
4001: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
4002: const char *passphrase, const char *comment,
1.80 djm 4003: int format, const char *openssh_format_cipher, int openssh_format_rounds)
1.1 djm 4004: {
4005: switch (key->type) {
1.9 markus 4006: #ifdef WITH_OPENSSL
1.1 djm 4007: case KEY_DSA:
4008: case KEY_ECDSA:
4009: case KEY_RSA:
1.80 djm 4010: break; /* see below */
1.1 djm 4011: #endif /* WITH_OPENSSL */
4012: case KEY_ED25519:
1.62 markus 4013: #ifdef WITH_XMSS
4014: case KEY_XMSS:
4015: #endif /* WITH_XMSS */
1.1 djm 4016: return sshkey_private_to_blob2(key, blob, passphrase,
1.80 djm 4017: comment, openssh_format_cipher, openssh_format_rounds);
1.1 djm 4018: default:
4019: return SSH_ERR_KEY_TYPE_UNKNOWN;
4020: }
1.80 djm 4021:
4022: #ifdef WITH_OPENSSL
4023: switch (format) {
4024: case SSHKEY_PRIVATE_OPENSSH:
4025: return sshkey_private_to_blob2(key, blob, passphrase,
4026: comment, openssh_format_cipher, openssh_format_rounds);
4027: case SSHKEY_PRIVATE_PEM:
4028: case SSHKEY_PRIVATE_PKCS8:
4029: return sshkey_private_to_blob_pem_pkcs8(key, blob,
4030: format, passphrase, comment);
4031: default:
4032: return SSH_ERR_INVALID_ARGUMENT;
4033: }
4034: #endif /* WITH_OPENSSL */
1.1 djm 4035: }
4036:
4037:
4038: #ifdef WITH_OPENSSL
1.8 djm 4039: static int
1.52 djm 4040: translate_libcrypto_error(unsigned long pem_err)
4041: {
4042: int pem_reason = ERR_GET_REASON(pem_err);
4043:
4044: switch (ERR_GET_LIB(pem_err)) {
4045: case ERR_LIB_PEM:
4046: switch (pem_reason) {
4047: case PEM_R_BAD_PASSWORD_READ:
4048: case PEM_R_PROBLEMS_GETTING_PASSWORD:
4049: case PEM_R_BAD_DECRYPT:
4050: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4051: default:
4052: return SSH_ERR_INVALID_FORMAT;
4053: }
4054: case ERR_LIB_EVP:
4055: switch (pem_reason) {
4056: case EVP_R_BAD_DECRYPT:
4057: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 4058: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 4059: case EVP_R_BN_DECODE_ERROR:
1.69 djm 4060: #endif
1.52 djm 4061: case EVP_R_DECODE_ERROR:
4062: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
4063: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
4064: #endif
4065: return SSH_ERR_INVALID_FORMAT;
4066: default:
4067: return SSH_ERR_LIBCRYPTO_ERROR;
4068: }
4069: case ERR_LIB_ASN1:
4070: return SSH_ERR_INVALID_FORMAT;
4071: }
4072: return SSH_ERR_LIBCRYPTO_ERROR;
4073: }
4074:
4075: static void
4076: clear_libcrypto_errors(void)
4077: {
4078: while (ERR_get_error() != 0)
4079: ;
4080: }
4081:
4082: /*
4083: * Translate OpenSSL error codes to determine whether
4084: * passphrase is required/incorrect.
4085: */
4086: static int
4087: convert_libcrypto_error(void)
4088: {
4089: /*
4090: * Some password errors are reported at the beginning
4091: * of the error queue.
4092: */
4093: if (translate_libcrypto_error(ERR_peek_error()) ==
4094: SSH_ERR_KEY_WRONG_PASSPHRASE)
4095: return SSH_ERR_KEY_WRONG_PASSPHRASE;
4096: return translate_libcrypto_error(ERR_peek_last_error());
4097: }
4098:
4099: static int
1.1 djm 4100: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 4101: const char *passphrase, struct sshkey **keyp)
1.1 djm 4102: {
4103: EVP_PKEY *pk = NULL;
4104: struct sshkey *prv = NULL;
4105: BIO *bio = NULL;
4106: int r;
4107:
1.32 djm 4108: if (keyp != NULL)
4109: *keyp = NULL;
1.1 djm 4110:
4111: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
4112: return SSH_ERR_ALLOC_FAIL;
4113: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
4114: (int)sshbuf_len(blob)) {
4115: r = SSH_ERR_ALLOC_FAIL;
4116: goto out;
4117: }
4118:
1.52 djm 4119: clear_libcrypto_errors();
1.1 djm 4120: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
4121: (char *)passphrase)) == NULL) {
1.71 djm 4122: /*
4123: * libcrypto may return various ASN.1 errors when attempting
4124: * to parse a key with an incorrect passphrase.
4125: * Treat all format errors as "incorrect passphrase" if a
4126: * passphrase was supplied.
4127: */
4128: if (passphrase != NULL && *passphrase != '\0')
4129: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
4130: else
4131: r = convert_libcrypto_error();
1.1 djm 4132: goto out;
4133: }
1.69 djm 4134: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 4135: (type == KEY_UNSPEC || type == KEY_RSA)) {
4136: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4137: r = SSH_ERR_ALLOC_FAIL;
4138: goto out;
4139: }
4140: prv->rsa = EVP_PKEY_get1_RSA(pk);
4141: prv->type = KEY_RSA;
4142: #ifdef DEBUG_PK
4143: RSA_print_fp(stderr, prv->rsa, 8);
4144: #endif
4145: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
4146: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 4147: goto out;
4148: }
1.69 djm 4149: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 4150: goto out;
1.69 djm 4151: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 4152: (type == KEY_UNSPEC || type == KEY_DSA)) {
4153: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4154: r = SSH_ERR_ALLOC_FAIL;
4155: goto out;
4156: }
4157: prv->dsa = EVP_PKEY_get1_DSA(pk);
4158: prv->type = KEY_DSA;
4159: #ifdef DEBUG_PK
4160: DSA_print_fp(stderr, prv->dsa, 8);
4161: #endif
1.69 djm 4162: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 4163: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
4164: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
4165: r = SSH_ERR_ALLOC_FAIL;
4166: goto out;
4167: }
4168: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
4169: prv->type = KEY_ECDSA;
4170: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
4171: if (prv->ecdsa_nid == -1 ||
4172: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
4173: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
4174: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
4175: sshkey_ec_validate_private(prv->ecdsa) != 0) {
4176: r = SSH_ERR_INVALID_FORMAT;
4177: goto out;
4178: }
4179: #ifdef DEBUG_PK
4180: if (prv != NULL && prv->ecdsa != NULL)
4181: sshkey_dump_ec_key(prv->ecdsa);
4182: #endif
4183: } else {
4184: r = SSH_ERR_INVALID_FORMAT;
4185: goto out;
4186: }
4187: r = 0;
1.32 djm 4188: if (keyp != NULL) {
4189: *keyp = prv;
4190: prv = NULL;
4191: }
1.1 djm 4192: out:
4193: BIO_free(bio);
1.60 jsing 4194: EVP_PKEY_free(pk);
1.30 mmcc 4195: sshkey_free(prv);
1.1 djm 4196: return r;
4197: }
4198: #endif /* WITH_OPENSSL */
4199:
4200: int
4201: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
4202: const char *passphrase, struct sshkey **keyp, char **commentp)
4203: {
1.42 djm 4204: int r = SSH_ERR_INTERNAL_ERROR;
4205:
1.32 djm 4206: if (keyp != NULL)
4207: *keyp = NULL;
1.1 djm 4208: if (commentp != NULL)
4209: *commentp = NULL;
4210:
4211: switch (type) {
1.9 markus 4212: #ifdef WITH_OPENSSL
1.1 djm 4213: case KEY_DSA:
4214: case KEY_ECDSA:
4215: case KEY_RSA:
1.8 djm 4216: return sshkey_parse_private_pem_fileblob(blob, type,
4217: passphrase, keyp);
1.1 djm 4218: #endif /* WITH_OPENSSL */
4219: case KEY_ED25519:
1.62 markus 4220: #ifdef WITH_XMSS
4221: case KEY_XMSS:
4222: #endif /* WITH_XMSS */
1.1 djm 4223: return sshkey_parse_private2(blob, type, passphrase,
4224: keyp, commentp);
4225: case KEY_UNSPEC:
1.42 djm 4226: r = sshkey_parse_private2(blob, type, passphrase, keyp,
4227: commentp);
4228: /* Do not fallback to PEM parser if only passphrase is wrong. */
4229: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
4230: return r;
1.1 djm 4231: #ifdef WITH_OPENSSL
1.8 djm 4232: return sshkey_parse_private_pem_fileblob(blob, type,
4233: passphrase, keyp);
1.1 djm 4234: #else
4235: return SSH_ERR_INVALID_FORMAT;
4236: #endif /* WITH_OPENSSL */
4237: default:
4238: return SSH_ERR_KEY_TYPE_UNKNOWN;
4239: }
4240: }
4241:
4242: int
4243: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 4244: struct sshkey **keyp, char **commentp)
1.1 djm 4245: {
4246: if (keyp != NULL)
4247: *keyp = NULL;
4248: if (commentp != NULL)
4249: *commentp = NULL;
4250:
1.23 tim 4251: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4252: passphrase, keyp, commentp);
1.1 djm 4253: }
1.62 markus 4254:
4255: #ifdef WITH_XMSS
4256: /*
4257: * serialize the key with the current state and forward the state
4258: * maxsign times.
4259: */
4260: int
1.77 djm 4261: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4262: u_int32_t maxsign, sshkey_printfn *pr)
4263: {
4264: int r, rupdate;
4265:
4266: if (maxsign == 0 ||
4267: sshkey_type_plain(k->type) != KEY_XMSS)
4268: return sshkey_private_serialize_opt(k, b,
4269: SSHKEY_SERIALIZE_DEFAULT);
4270: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4271: (r = sshkey_private_serialize_opt(k, b,
4272: SSHKEY_SERIALIZE_STATE)) != 0 ||
4273: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4274: goto out;
4275: r = 0;
4276: out:
4277: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4278: if (r == 0)
4279: r = rupdate;
4280: }
4281: return r;
4282: }
4283:
4284: u_int32_t
4285: sshkey_signatures_left(const struct sshkey *k)
4286: {
4287: if (sshkey_type_plain(k->type) == KEY_XMSS)
4288: return sshkey_xmss_signatures_left(k);
4289: return 0;
4290: }
4291:
4292: int
4293: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4294: {
4295: if (sshkey_type_plain(k->type) != KEY_XMSS)
4296: return SSH_ERR_INVALID_ARGUMENT;
4297: return sshkey_xmss_enable_maxsign(k, maxsign);
4298: }
4299:
4300: int
4301: sshkey_set_filename(struct sshkey *k, const char *filename)
4302: {
4303: if (k == NULL)
4304: return SSH_ERR_INVALID_ARGUMENT;
4305: if (sshkey_type_plain(k->type) != KEY_XMSS)
4306: return 0;
4307: if (filename == NULL)
4308: return SSH_ERR_INVALID_ARGUMENT;
4309: if ((k->xmss_filename = strdup(filename)) == NULL)
4310: return SSH_ERR_ALLOC_FAIL;
4311: return 0;
4312: }
4313: #else
4314: int
1.76 djm 4315: sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
1.62 markus 4316: u_int32_t maxsign, sshkey_printfn *pr)
4317: {
4318: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4319: }
4320:
4321: u_int32_t
4322: sshkey_signatures_left(const struct sshkey *k)
4323: {
4324: return 0;
4325: }
4326:
4327: int
4328: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4329: {
4330: return SSH_ERR_INVALID_ARGUMENT;
4331: }
4332:
4333: int
4334: sshkey_set_filename(struct sshkey *k, const char *filename)
4335: {
4336: if (k == NULL)
4337: return SSH_ERR_INVALID_ARGUMENT;
4338: return 0;
4339: }
4340: #endif /* WITH_XMSS */
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