Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.75
1.75 ! djm 1: /* $OpenBSD: sshkey.c,v 1.74 2019/05/03 03:25:18 dtucker 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:
1.62 markus 75: int sshkey_private_serialize_opt(const struct sshkey *key,
76: struct sshbuf *buf, enum sshkey_serialize_rep);
1.14 djm 77: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 78: struct sshkey **keyp, int allow_cert);
1.67 djm 79: static int get_sigtype(const u_char *sig, size_t siglen, char **sigtypep);
1.1 djm 80:
81: /* Supported key types */
82: struct keytype {
83: const char *name;
84: const char *shortname;
1.65 djm 85: const char *sigalg;
1.1 djm 86: int type;
87: int nid;
88: int cert;
1.28 markus 89: int sigonly;
1.1 djm 90: };
91: static const struct keytype keytypes[] = {
1.65 djm 92: { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 },
93: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL,
1.28 markus 94: KEY_ED25519_CERT, 0, 1, 0 },
1.62 markus 95: #ifdef WITH_XMSS
1.65 djm 96: { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 },
97: { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL,
1.62 markus 98: KEY_XMSS_CERT, 0, 1, 0 },
99: #endif /* WITH_XMSS */
1.1 djm 100: #ifdef WITH_OPENSSL
1.65 djm 101: { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 },
102: { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 },
103: { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 },
104: { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 },
105: { "ecdsa-sha2-nistp256", "ECDSA", NULL,
106: KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
107: { "ecdsa-sha2-nistp384", "ECDSA", NULL,
108: KEY_ECDSA, NID_secp384r1, 0, 0 },
109: { "ecdsa-sha2-nistp521", "ECDSA", NULL,
110: KEY_ECDSA, NID_secp521r1, 0, 0 },
111: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL,
112: KEY_RSA_CERT, 0, 1, 0 },
113: { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 114: "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 115: { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT",
1.72 djm 116: "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 117: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL,
118: KEY_DSA_CERT, 0, 1, 0 },
119: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 120: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.65 djm 121: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 122: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.65 djm 123: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL,
124: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.1 djm 125: #endif /* WITH_OPENSSL */
1.65 djm 126: { NULL, NULL, NULL, -1, -1, 0, 0 }
1.1 djm 127: };
128:
129: const char *
130: sshkey_type(const struct sshkey *k)
131: {
132: const struct keytype *kt;
133:
134: for (kt = keytypes; kt->type != -1; kt++) {
135: if (kt->type == k->type)
136: return kt->shortname;
137: }
138: return "unknown";
139: }
140:
141: static const char *
142: sshkey_ssh_name_from_type_nid(int type, int nid)
143: {
144: const struct keytype *kt;
145:
146: for (kt = keytypes; kt->type != -1; kt++) {
147: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
148: return kt->name;
149: }
150: return "ssh-unknown";
151: }
152:
153: int
154: sshkey_type_is_cert(int type)
155: {
156: const struct keytype *kt;
157:
158: for (kt = keytypes; kt->type != -1; kt++) {
159: if (kt->type == type)
160: return kt->cert;
161: }
162: return 0;
163: }
164:
165: const char *
166: sshkey_ssh_name(const struct sshkey *k)
167: {
168: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
169: }
170:
171: const char *
172: sshkey_ssh_name_plain(const struct sshkey *k)
173: {
174: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
175: k->ecdsa_nid);
176: }
177:
178: int
179: sshkey_type_from_name(const char *name)
180: {
181: const struct keytype *kt;
182:
183: for (kt = keytypes; kt->type != -1; kt++) {
184: /* Only allow shortname matches for plain key types */
185: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
186: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
187: return kt->type;
188: }
189: return KEY_UNSPEC;
190: }
191:
192: int
193: sshkey_ecdsa_nid_from_name(const char *name)
194: {
195: const struct keytype *kt;
196:
1.4 djm 197: for (kt = keytypes; kt->type != -1; kt++) {
198: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
199: continue;
200: if (kt->name != NULL && strcmp(name, kt->name) == 0)
201: return kt->nid;
202: }
1.1 djm 203: return -1;
204: }
205:
206: char *
1.45 djm 207: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 208: {
209: char *tmp, *ret = NULL;
210: size_t nlen, rlen = 0;
211: const struct keytype *kt;
212:
213: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 214: if (kt->name == NULL)
215: continue;
216: if (!include_sigonly && kt->sigonly)
1.1 djm 217: continue;
218: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
219: continue;
220: if (ret != NULL)
1.38 djm 221: ret[rlen++] = sep;
1.1 djm 222: nlen = strlen(kt->name);
223: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
224: free(ret);
225: return NULL;
226: }
227: ret = tmp;
228: memcpy(ret + rlen, kt->name, nlen + 1);
229: rlen += nlen;
230: }
231: return ret;
232: }
233:
234: int
1.11 djm 235: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 236: {
237: char *s, *cp, *p;
1.11 djm 238: const struct keytype *kt;
239: int type;
1.1 djm 240:
241: if (names == NULL || strcmp(names, "") == 0)
242: return 0;
243: if ((s = cp = strdup(names)) == NULL)
244: return 0;
245: for ((p = strsep(&cp, ",")); p && *p != '\0';
246: (p = strsep(&cp, ","))) {
1.11 djm 247: type = sshkey_type_from_name(p);
248: if (type == KEY_UNSPEC) {
249: if (allow_wildcard) {
250: /*
251: * Try matching key types against the string.
252: * If any has a positive or negative match then
253: * the component is accepted.
254: */
255: for (kt = keytypes; kt->type != -1; kt++) {
256: if (match_pattern_list(kt->name,
1.17 djm 257: p, 0) != 0)
1.11 djm 258: break;
259: }
260: if (kt->type != -1)
261: continue;
262: }
1.1 djm 263: free(s);
264: return 0;
265: }
266: }
267: free(s);
268: return 1;
269: }
270:
271: u_int
272: sshkey_size(const struct sshkey *k)
273: {
1.69 djm 274: #ifdef WITH_OPENSSL
275: const BIGNUM *rsa_n, *dsa_p;
276: #endif /* WITH_OPENSSL */
277:
1.1 djm 278: switch (k->type) {
279: #ifdef WITH_OPENSSL
280: case KEY_RSA:
281: case KEY_RSA_CERT:
1.69 djm 282: if (k->rsa == NULL)
283: return 0;
284: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
285: return BN_num_bits(rsa_n);
1.1 djm 286: case KEY_DSA:
287: case KEY_DSA_CERT:
1.69 djm 288: if (k->dsa == NULL)
289: return 0;
290: DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL);
291: return BN_num_bits(dsa_p);
1.1 djm 292: case KEY_ECDSA:
293: case KEY_ECDSA_CERT:
294: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
295: #endif /* WITH_OPENSSL */
296: case KEY_ED25519:
297: case KEY_ED25519_CERT:
1.62 markus 298: case KEY_XMSS:
299: case KEY_XMSS_CERT:
1.1 djm 300: return 256; /* XXX */
301: }
302: return 0;
303: }
304:
305: static int
306: sshkey_type_is_valid_ca(int type)
307: {
308: switch (type) {
309: case KEY_RSA:
310: case KEY_DSA:
311: case KEY_ECDSA:
312: case KEY_ED25519:
1.62 markus 313: case KEY_XMSS:
1.1 djm 314: return 1;
315: default:
316: return 0;
317: }
318: }
319:
320: int
321: sshkey_is_cert(const struct sshkey *k)
322: {
323: if (k == NULL)
324: return 0;
325: return sshkey_type_is_cert(k->type);
326: }
327:
328: /* Return the cert-less equivalent to a certified key type */
329: int
330: sshkey_type_plain(int type)
331: {
332: switch (type) {
333: case KEY_RSA_CERT:
334: return KEY_RSA;
335: case KEY_DSA_CERT:
336: return KEY_DSA;
337: case KEY_ECDSA_CERT:
338: return KEY_ECDSA;
339: case KEY_ED25519_CERT:
340: return KEY_ED25519;
1.62 markus 341: case KEY_XMSS_CERT:
342: return KEY_XMSS;
1.1 djm 343: default:
344: return type;
345: }
346: }
347:
348: #ifdef WITH_OPENSSL
349: /* XXX: these are really begging for a table-driven approach */
350: int
351: sshkey_curve_name_to_nid(const char *name)
352: {
353: if (strcmp(name, "nistp256") == 0)
354: return NID_X9_62_prime256v1;
355: else if (strcmp(name, "nistp384") == 0)
356: return NID_secp384r1;
357: else if (strcmp(name, "nistp521") == 0)
358: return NID_secp521r1;
359: else
360: return -1;
361: }
362:
363: u_int
364: sshkey_curve_nid_to_bits(int nid)
365: {
366: switch (nid) {
367: case NID_X9_62_prime256v1:
368: return 256;
369: case NID_secp384r1:
370: return 384;
371: case NID_secp521r1:
372: return 521;
373: default:
374: return 0;
375: }
376: }
377:
378: int
379: sshkey_ecdsa_bits_to_nid(int bits)
380: {
381: switch (bits) {
382: case 256:
383: return NID_X9_62_prime256v1;
384: case 384:
385: return NID_secp384r1;
386: case 521:
387: return NID_secp521r1;
388: default:
389: return -1;
390: }
391: }
392:
393: const char *
394: sshkey_curve_nid_to_name(int nid)
395: {
396: switch (nid) {
397: case NID_X9_62_prime256v1:
398: return "nistp256";
399: case NID_secp384r1:
400: return "nistp384";
401: case NID_secp521r1:
402: return "nistp521";
403: default:
404: return NULL;
405: }
406: }
407:
408: int
409: sshkey_ec_nid_to_hash_alg(int nid)
410: {
411: int kbits = sshkey_curve_nid_to_bits(nid);
412:
413: if (kbits <= 0)
414: return -1;
415:
416: /* RFC5656 section 6.2.1 */
417: if (kbits <= 256)
418: return SSH_DIGEST_SHA256;
419: else if (kbits <= 384)
420: return SSH_DIGEST_SHA384;
421: else
422: return SSH_DIGEST_SHA512;
423: }
424: #endif /* WITH_OPENSSL */
425:
426: static void
427: cert_free(struct sshkey_cert *cert)
428: {
429: u_int i;
430:
431: if (cert == NULL)
432: return;
1.31 mmcc 433: sshbuf_free(cert->certblob);
434: sshbuf_free(cert->critical);
435: sshbuf_free(cert->extensions);
1.29 mmcc 436: free(cert->key_id);
1.1 djm 437: for (i = 0; i < cert->nprincipals; i++)
438: free(cert->principals[i]);
1.29 mmcc 439: free(cert->principals);
1.30 mmcc 440: sshkey_free(cert->signature_key);
1.67 djm 441: free(cert->signature_type);
1.61 jsing 442: freezero(cert, sizeof(*cert));
1.1 djm 443: }
444:
445: static struct sshkey_cert *
446: cert_new(void)
447: {
448: struct sshkey_cert *cert;
449:
450: if ((cert = calloc(1, sizeof(*cert))) == NULL)
451: return NULL;
452: if ((cert->certblob = sshbuf_new()) == NULL ||
453: (cert->critical = sshbuf_new()) == NULL ||
454: (cert->extensions = sshbuf_new()) == NULL) {
455: cert_free(cert);
456: return NULL;
457: }
458: cert->key_id = NULL;
459: cert->principals = NULL;
460: cert->signature_key = NULL;
1.67 djm 461: cert->signature_type = NULL;
1.1 djm 462: return cert;
463: }
464:
465: struct sshkey *
466: sshkey_new(int type)
467: {
468: struct sshkey *k;
469: #ifdef WITH_OPENSSL
470: RSA *rsa;
471: DSA *dsa;
472: #endif /* WITH_OPENSSL */
473:
474: if ((k = calloc(1, sizeof(*k))) == NULL)
475: return NULL;
476: k->type = type;
477: k->ecdsa = NULL;
478: k->ecdsa_nid = -1;
479: k->dsa = NULL;
480: k->rsa = NULL;
481: k->cert = NULL;
482: k->ed25519_sk = NULL;
483: k->ed25519_pk = NULL;
1.62 markus 484: k->xmss_sk = NULL;
485: k->xmss_pk = NULL;
1.1 djm 486: switch (k->type) {
487: #ifdef WITH_OPENSSL
488: case KEY_RSA:
489: case KEY_RSA_CERT:
1.69 djm 490: if ((rsa = RSA_new()) == NULL) {
1.1 djm 491: free(k);
492: return NULL;
493: }
494: k->rsa = rsa;
495: break;
496: case KEY_DSA:
497: case KEY_DSA_CERT:
1.69 djm 498: if ((dsa = DSA_new()) == NULL) {
1.1 djm 499: free(k);
500: return NULL;
501: }
502: k->dsa = dsa;
503: break;
504: case KEY_ECDSA:
505: case KEY_ECDSA_CERT:
506: /* Cannot do anything until we know the group */
507: break;
508: #endif /* WITH_OPENSSL */
509: case KEY_ED25519:
510: case KEY_ED25519_CERT:
1.62 markus 511: case KEY_XMSS:
512: case KEY_XMSS_CERT:
1.1 djm 513: /* no need to prealloc */
514: break;
515: case KEY_UNSPEC:
516: break;
517: default:
518: free(k);
519: return NULL;
520: }
521:
522: if (sshkey_is_cert(k)) {
523: if ((k->cert = cert_new()) == NULL) {
524: sshkey_free(k);
525: return NULL;
526: }
527: }
528:
529: return k;
530: }
531:
532: void
533: sshkey_free(struct sshkey *k)
534: {
535: if (k == NULL)
536: return;
537: switch (k->type) {
538: #ifdef WITH_OPENSSL
539: case KEY_RSA:
540: case KEY_RSA_CERT:
1.60 jsing 541: RSA_free(k->rsa);
1.1 djm 542: k->rsa = NULL;
543: break;
544: case KEY_DSA:
545: case KEY_DSA_CERT:
1.60 jsing 546: DSA_free(k->dsa);
1.1 djm 547: k->dsa = NULL;
548: break;
549: case KEY_ECDSA:
550: case KEY_ECDSA_CERT:
1.60 jsing 551: EC_KEY_free(k->ecdsa);
1.1 djm 552: k->ecdsa = NULL;
553: break;
554: #endif /* WITH_OPENSSL */
555: case KEY_ED25519:
556: case KEY_ED25519_CERT:
1.61 jsing 557: freezero(k->ed25519_pk, ED25519_PK_SZ);
558: k->ed25519_pk = NULL;
559: freezero(k->ed25519_sk, ED25519_SK_SZ);
560: k->ed25519_sk = NULL;
1.1 djm 561: break;
1.62 markus 562: #ifdef WITH_XMSS
563: case KEY_XMSS:
564: case KEY_XMSS_CERT:
565: freezero(k->xmss_pk, sshkey_xmss_pklen(k));
566: k->xmss_pk = NULL;
567: freezero(k->xmss_sk, sshkey_xmss_sklen(k));
568: k->xmss_sk = NULL;
569: sshkey_xmss_free_state(k);
570: free(k->xmss_name);
571: k->xmss_name = NULL;
572: free(k->xmss_filename);
573: k->xmss_filename = NULL;
574: break;
575: #endif /* WITH_XMSS */
1.1 djm 576: case KEY_UNSPEC:
577: break;
578: default:
579: break;
580: }
581: if (sshkey_is_cert(k))
582: cert_free(k->cert);
1.61 jsing 583: freezero(k, sizeof(*k));
1.1 djm 584: }
585:
586: static int
587: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
588: {
589: if (a == NULL && b == NULL)
590: return 1;
591: if (a == NULL || b == NULL)
592: return 0;
593: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
594: return 0;
595: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
596: sshbuf_len(a->certblob)) != 0)
597: return 0;
598: return 1;
599: }
600:
601: /*
602: * Compare public portions of key only, allowing comparisons between
603: * certificates and plain keys too.
604: */
605: int
606: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
607: {
608: #ifdef WITH_OPENSSL
609: BN_CTX *bnctx;
1.69 djm 610: const BIGNUM *rsa_e_a, *rsa_n_a;
611: const BIGNUM *rsa_e_b, *rsa_n_b;
612: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
613: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 614: #endif /* WITH_OPENSSL */
615:
616: if (a == NULL || b == NULL ||
617: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
618: return 0;
619:
620: switch (a->type) {
621: #ifdef WITH_OPENSSL
622: case KEY_RSA_CERT:
623: case KEY_RSA:
1.69 djm 624: if (a->rsa == NULL || b->rsa == NULL)
625: return 0;
626: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
627: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
628: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
629: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 630: case KEY_DSA_CERT:
631: case KEY_DSA:
1.69 djm 632: if (a->dsa == NULL || b->dsa == NULL)
633: return 0;
634: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
635: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
636: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
637: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
638: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
639: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
640: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
641: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.1 djm 642: case KEY_ECDSA_CERT:
643: case KEY_ECDSA:
644: if (a->ecdsa == NULL || b->ecdsa == NULL ||
645: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
646: EC_KEY_get0_public_key(b->ecdsa) == NULL)
647: return 0;
648: if ((bnctx = BN_CTX_new()) == NULL)
649: return 0;
650: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
651: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
652: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
653: EC_KEY_get0_public_key(a->ecdsa),
654: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
655: BN_CTX_free(bnctx);
656: return 0;
657: }
658: BN_CTX_free(bnctx);
659: return 1;
660: #endif /* WITH_OPENSSL */
661: case KEY_ED25519:
662: case KEY_ED25519_CERT:
663: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
664: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 665: #ifdef WITH_XMSS
666: case KEY_XMSS:
667: case KEY_XMSS_CERT:
668: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
669: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
670: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
671: #endif /* WITH_XMSS */
1.1 djm 672: default:
673: return 0;
674: }
675: /* NOTREACHED */
676: }
677:
678: int
679: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
680: {
681: if (a == NULL || b == NULL || a->type != b->type)
682: return 0;
683: if (sshkey_is_cert(a)) {
684: if (!cert_compare(a->cert, b->cert))
685: return 0;
686: }
687: return sshkey_equal_public(a, b);
688: }
689:
690: static int
1.62 markus 691: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
692: enum sshkey_serialize_rep opts)
1.1 djm 693: {
694: int type, ret = SSH_ERR_INTERNAL_ERROR;
695: const char *typename;
1.69 djm 696: #ifdef WITH_OPENSSL
697: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
698: #endif /* WITH_OPENSSL */
1.1 djm 699:
700: if (key == NULL)
701: return SSH_ERR_INVALID_ARGUMENT;
702:
1.19 djm 703: if (sshkey_is_cert(key)) {
704: if (key->cert == NULL)
705: return SSH_ERR_EXPECTED_CERT;
706: if (sshbuf_len(key->cert->certblob) == 0)
707: return SSH_ERR_KEY_LACKS_CERTBLOB;
708: }
1.1 djm 709: type = force_plain ? sshkey_type_plain(key->type) : key->type;
710: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
711:
712: switch (type) {
713: #ifdef WITH_OPENSSL
714: case KEY_DSA_CERT:
715: case KEY_ECDSA_CERT:
716: case KEY_RSA_CERT:
717: #endif /* WITH_OPENSSL */
718: case KEY_ED25519_CERT:
1.62 markus 719: #ifdef WITH_XMSS
720: case KEY_XMSS_CERT:
721: #endif /* WITH_XMSS */
1.1 djm 722: /* Use the existing blob */
723: /* XXX modified flag? */
724: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
725: return ret;
726: break;
727: #ifdef WITH_OPENSSL
728: case KEY_DSA:
729: if (key->dsa == NULL)
730: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 731: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
732: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 733: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 734: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
735: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
736: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
737: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 738: return ret;
739: break;
740: case KEY_ECDSA:
741: if (key->ecdsa == NULL)
742: return SSH_ERR_INVALID_ARGUMENT;
743: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
744: (ret = sshbuf_put_cstring(b,
745: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
746: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
747: return ret;
748: break;
749: case KEY_RSA:
750: if (key->rsa == NULL)
751: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 752: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 753: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 754: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
755: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 756: return ret;
757: break;
758: #endif /* WITH_OPENSSL */
759: case KEY_ED25519:
760: if (key->ed25519_pk == NULL)
761: return SSH_ERR_INVALID_ARGUMENT;
762: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
763: (ret = sshbuf_put_string(b,
764: key->ed25519_pk, ED25519_PK_SZ)) != 0)
765: return ret;
766: break;
1.62 markus 767: #ifdef WITH_XMSS
768: case KEY_XMSS:
769: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
770: sshkey_xmss_pklen(key) == 0)
771: return SSH_ERR_INVALID_ARGUMENT;
772: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
773: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
774: (ret = sshbuf_put_string(b,
775: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
776: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
777: return ret;
778: break;
779: #endif /* WITH_XMSS */
1.1 djm 780: default:
781: return SSH_ERR_KEY_TYPE_UNKNOWN;
782: }
783: return 0;
784: }
785:
786: int
1.14 djm 787: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 788: {
1.62 markus 789: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 790: }
791:
792: int
1.62 markus 793: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
794: enum sshkey_serialize_rep opts)
1.14 djm 795: {
796: struct sshbuf *tmp;
797: int r;
798:
799: if ((tmp = sshbuf_new()) == NULL)
800: return SSH_ERR_ALLOC_FAIL;
1.62 markus 801: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 802: if (r == 0)
803: r = sshbuf_put_stringb(b, tmp);
804: sshbuf_free(tmp);
805: return r;
806: }
807:
808: int
1.62 markus 809: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
810: {
811: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
812: }
813:
814: int
1.14 djm 815: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 816: {
1.62 markus 817: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 818: }
819:
820: static int
1.62 markus 821: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
822: enum sshkey_serialize_rep opts)
1.1 djm 823: {
824: int ret = SSH_ERR_INTERNAL_ERROR;
825: size_t len;
826: struct sshbuf *b = NULL;
827:
828: if (lenp != NULL)
829: *lenp = 0;
830: if (blobp != NULL)
831: *blobp = NULL;
832: if ((b = sshbuf_new()) == NULL)
833: return SSH_ERR_ALLOC_FAIL;
1.62 markus 834: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 835: goto out;
836: len = sshbuf_len(b);
837: if (lenp != NULL)
838: *lenp = len;
839: if (blobp != NULL) {
840: if ((*blobp = malloc(len)) == NULL) {
841: ret = SSH_ERR_ALLOC_FAIL;
842: goto out;
843: }
844: memcpy(*blobp, sshbuf_ptr(b), len);
845: }
846: ret = 0;
847: out:
848: sshbuf_free(b);
849: return ret;
850: }
851:
852: int
853: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
854: {
1.62 markus 855: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 856: }
857:
858: int
859: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
860: {
1.62 markus 861: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 862: }
863:
864: int
1.7 djm 865: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 866: u_char **retp, size_t *lenp)
867: {
868: u_char *blob = NULL, *ret = NULL;
869: size_t blob_len = 0;
1.7 djm 870: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 871:
872: if (retp != NULL)
873: *retp = NULL;
874: if (lenp != NULL)
875: *lenp = 0;
1.7 djm 876: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 877: r = SSH_ERR_INVALID_ARGUMENT;
878: goto out;
879: }
1.62 markus 880: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
881: != 0)
1.1 djm 882: goto out;
883: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
884: r = SSH_ERR_ALLOC_FAIL;
885: goto out;
886: }
1.7 djm 887: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 888: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
889: goto out;
890: /* success */
891: if (retp != NULL) {
892: *retp = ret;
893: ret = NULL;
894: }
895: if (lenp != NULL)
1.7 djm 896: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 897: r = 0;
898: out:
899: free(ret);
900: if (blob != NULL) {
901: explicit_bzero(blob, blob_len);
902: free(blob);
903: }
904: return r;
905: }
906:
907: static char *
1.7 djm 908: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
909: {
910: char *ret;
911: size_t plen = strlen(alg) + 1;
912: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
913: int r;
914:
915: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
916: return NULL;
917: strlcpy(ret, alg, rlen);
918: strlcat(ret, ":", rlen);
919: if (dgst_raw_len == 0)
920: return ret;
921: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
922: ret + plen, rlen - plen)) == -1) {
1.61 jsing 923: freezero(ret, rlen);
1.7 djm 924: return NULL;
925: }
926: /* Trim padding characters from end */
927: ret[strcspn(ret, "=")] = '\0';
928: return ret;
929: }
930:
931: static char *
932: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 933: {
1.7 djm 934: char *retval, hex[5];
935: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 936:
1.7 djm 937: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 938: return NULL;
1.7 djm 939: strlcpy(retval, alg, rlen);
940: strlcat(retval, ":", rlen);
1.1 djm 941: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 942: snprintf(hex, sizeof(hex), "%s%02x",
943: i > 0 ? ":" : "", dgst_raw[i]);
944: strlcat(retval, hex, rlen);
1.1 djm 945: }
946: return retval;
947: }
948:
949: static char *
950: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
951: {
952: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
953: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
954: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
955: u_int i, j = 0, rounds, seed = 1;
956: char *retval;
957:
958: rounds = (dgst_raw_len / 2) + 1;
959: if ((retval = calloc(rounds, 6)) == NULL)
960: return NULL;
961: retval[j++] = 'x';
962: for (i = 0; i < rounds; i++) {
963: u_int idx0, idx1, idx2, idx3, idx4;
964: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
965: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
966: seed) % 6;
967: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
968: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
969: (seed / 6)) % 6;
970: retval[j++] = vowels[idx0];
971: retval[j++] = consonants[idx1];
972: retval[j++] = vowels[idx2];
973: if ((i + 1) < rounds) {
974: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
975: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
976: retval[j++] = consonants[idx3];
977: retval[j++] = '-';
978: retval[j++] = consonants[idx4];
979: seed = ((seed * 5) +
980: ((((u_int)(dgst_raw[2 * i])) * 7) +
981: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
982: }
983: } else {
984: idx0 = seed % 6;
985: idx1 = 16;
986: idx2 = seed / 6;
987: retval[j++] = vowels[idx0];
988: retval[j++] = consonants[idx1];
989: retval[j++] = vowels[idx2];
990: }
991: }
992: retval[j++] = 'x';
993: retval[j++] = '\0';
994: return retval;
995: }
996:
997: /*
998: * Draw an ASCII-Art representing the fingerprint so human brain can
999: * profit from its built-in pattern recognition ability.
1000: * This technique is called "random art" and can be found in some
1001: * scientific publications like this original paper:
1002: *
1003: * "Hash Visualization: a New Technique to improve Real-World Security",
1004: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1005: * Techniques and E-Commerce (CrypTEC '99)
1006: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1007: *
1008: * The subject came up in a talk by Dan Kaminsky, too.
1009: *
1010: * If you see the picture is different, the key is different.
1011: * If the picture looks the same, you still know nothing.
1012: *
1013: * The algorithm used here is a worm crawling over a discrete plane,
1014: * leaving a trace (augmenting the field) everywhere it goes.
1015: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1016: * makes the respective movement vector be ignored for this turn.
1017: * Graphs are not unambiguous, because circles in graphs can be
1018: * walked in either direction.
1019: */
1020:
1021: /*
1022: * Field sizes for the random art. Have to be odd, so the starting point
1023: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1024: * Else pictures would be too dense, and drawing the frame would
1025: * fail, too, because the key type would not fit in anymore.
1026: */
1027: #define FLDBASE 8
1028: #define FLDSIZE_Y (FLDBASE + 1)
1029: #define FLDSIZE_X (FLDBASE * 2 + 1)
1030: static char *
1.7 djm 1031: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1032: const struct sshkey *k)
1033: {
1034: /*
1035: * Chars to be used after each other every time the worm
1036: * intersects with itself. Matter of taste.
1037: */
1038: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1039: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1040: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1041: size_t i, tlen, hlen;
1.1 djm 1042: u_int b;
1.3 djm 1043: int x, y, r;
1.1 djm 1044: size_t len = strlen(augmentation_string) - 1;
1045:
1046: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1047: return NULL;
1048:
1049: /* initialize field */
1050: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1051: x = FLDSIZE_X / 2;
1052: y = FLDSIZE_Y / 2;
1053:
1054: /* process raw key */
1055: for (i = 0; i < dgst_raw_len; i++) {
1056: int input;
1057: /* each byte conveys four 2-bit move commands */
1058: input = dgst_raw[i];
1059: for (b = 0; b < 4; b++) {
1060: /* evaluate 2 bit, rest is shifted later */
1061: x += (input & 0x1) ? 1 : -1;
1062: y += (input & 0x2) ? 1 : -1;
1063:
1064: /* assure we are still in bounds */
1.37 deraadt 1065: x = MAXIMUM(x, 0);
1066: y = MAXIMUM(y, 0);
1067: x = MINIMUM(x, FLDSIZE_X - 1);
1068: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1069:
1070: /* augment the field */
1071: if (field[x][y] < len - 2)
1072: field[x][y]++;
1073: input = input >> 2;
1074: }
1075: }
1076:
1077: /* mark starting point and end point*/
1078: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1079: field[x][y] = len;
1080:
1.3 djm 1081: /* assemble title */
1082: r = snprintf(title, sizeof(title), "[%s %u]",
1083: sshkey_type(k), sshkey_size(k));
1084: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1085: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1086: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1087: tlen = (r <= 0) ? 0 : strlen(title);
1088:
1089: /* assemble hash ID. */
1090: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1091: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1092:
1093: /* output upper border */
1.3 djm 1094: p = retval;
1095: *p++ = '+';
1096: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1097: *p++ = '-';
1098: memcpy(p, title, tlen);
1099: p += tlen;
1.7 djm 1100: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1101: *p++ = '-';
1102: *p++ = '+';
1103: *p++ = '\n';
1104:
1105: /* output content */
1106: for (y = 0; y < FLDSIZE_Y; y++) {
1107: *p++ = '|';
1108: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1109: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1110: *p++ = '|';
1111: *p++ = '\n';
1112: }
1113:
1114: /* output lower border */
1115: *p++ = '+';
1.7 djm 1116: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1117: *p++ = '-';
1118: memcpy(p, hash, hlen);
1119: p += hlen;
1120: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1121: *p++ = '-';
1122: *p++ = '+';
1123:
1124: return retval;
1125: }
1126:
1127: char *
1.7 djm 1128: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1129: enum sshkey_fp_rep dgst_rep)
1130: {
1131: char *retval = NULL;
1132: u_char *dgst_raw;
1133: size_t dgst_raw_len;
1134:
1.7 djm 1135: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1136: return NULL;
1137: switch (dgst_rep) {
1.7 djm 1138: case SSH_FP_DEFAULT:
1139: if (dgst_alg == SSH_DIGEST_MD5) {
1140: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1141: dgst_raw, dgst_raw_len);
1142: } else {
1143: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1144: dgst_raw, dgst_raw_len);
1145: }
1146: break;
1.1 djm 1147: case SSH_FP_HEX:
1.7 djm 1148: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1149: dgst_raw, dgst_raw_len);
1150: break;
1151: case SSH_FP_BASE64:
1152: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1153: dgst_raw, dgst_raw_len);
1.1 djm 1154: break;
1155: case SSH_FP_BUBBLEBABBLE:
1156: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1157: break;
1158: case SSH_FP_RANDOMART:
1.7 djm 1159: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1160: dgst_raw, dgst_raw_len, k);
1.1 djm 1161: break;
1162: default:
1163: explicit_bzero(dgst_raw, dgst_raw_len);
1164: free(dgst_raw);
1165: return NULL;
1166: }
1167: explicit_bzero(dgst_raw, dgst_raw_len);
1168: free(dgst_raw);
1169: return retval;
1170: }
1171:
1.63 djm 1172: static int
1173: peek_type_nid(const char *s, size_t l, int *nid)
1174: {
1175: const struct keytype *kt;
1176:
1177: for (kt = keytypes; kt->type != -1; kt++) {
1178: if (kt->name == NULL || strlen(kt->name) != l)
1179: continue;
1180: if (memcmp(s, kt->name, l) == 0) {
1181: *nid = -1;
1182: if (kt->type == KEY_ECDSA || kt->type == KEY_ECDSA_CERT)
1183: *nid = kt->nid;
1184: return kt->type;
1185: }
1186: }
1187: return KEY_UNSPEC;
1188: }
1189:
1.1 djm 1190:
1.63 djm 1191: /* XXX this can now be made const char * */
1.1 djm 1192: int
1193: sshkey_read(struct sshkey *ret, char **cpp)
1194: {
1195: struct sshkey *k;
1.63 djm 1196: char *cp, *blobcopy;
1197: size_t space;
1.1 djm 1198: int r, type, curve_nid = -1;
1199: struct sshbuf *blob;
1.44 dtucker 1200:
1201: if (ret == NULL)
1202: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1203:
1204: switch (ret->type) {
1205: case KEY_UNSPEC:
1206: case KEY_RSA:
1207: case KEY_DSA:
1208: case KEY_ECDSA:
1209: case KEY_ED25519:
1210: case KEY_DSA_CERT:
1211: case KEY_ECDSA_CERT:
1212: case KEY_RSA_CERT:
1213: case KEY_ED25519_CERT:
1.62 markus 1214: #ifdef WITH_XMSS
1215: case KEY_XMSS:
1216: case KEY_XMSS_CERT:
1217: #endif /* WITH_XMSS */
1.63 djm 1218: break; /* ok */
1219: default:
1220: return SSH_ERR_INVALID_ARGUMENT;
1221: }
1222:
1223: /* Decode type */
1224: cp = *cpp;
1225: space = strcspn(cp, " \t");
1226: if (space == strlen(cp))
1227: return SSH_ERR_INVALID_FORMAT;
1228: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1229: return SSH_ERR_INVALID_FORMAT;
1230:
1231: /* skip whitespace */
1232: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1233: ;
1234: if (*cp == '\0')
1235: return SSH_ERR_INVALID_FORMAT;
1236: if (ret->type != KEY_UNSPEC && ret->type != type)
1237: return SSH_ERR_KEY_TYPE_MISMATCH;
1238: if ((blob = sshbuf_new()) == NULL)
1239: return SSH_ERR_ALLOC_FAIL;
1240:
1241: /* find end of keyblob and decode */
1242: space = strcspn(cp, " \t");
1243: if ((blobcopy = strndup(cp, space)) == NULL) {
1244: sshbuf_free(blob);
1245: return SSH_ERR_ALLOC_FAIL;
1246: }
1247: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1248: free(blobcopy);
1249: sshbuf_free(blob);
1250: return r;
1251: }
1252: free(blobcopy);
1253: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1254: sshbuf_free(blob);
1.63 djm 1255: return r;
1256: }
1257: sshbuf_free(blob);
1258:
1259: /* skip whitespace and leave cp at start of comment */
1260: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1261: ;
1262:
1263: /* ensure type of blob matches type at start of line */
1264: if (k->type != type) {
1265: sshkey_free(k);
1266: return SSH_ERR_KEY_TYPE_MISMATCH;
1267: }
1268: if (sshkey_type_plain(type) == KEY_ECDSA && curve_nid != k->ecdsa_nid) {
1269: sshkey_free(k);
1270: return SSH_ERR_EC_CURVE_MISMATCH;
1271: }
1272:
1273: /* Fill in ret from parsed key */
1274: ret->type = type;
1275: if (sshkey_is_cert(ret)) {
1276: if (!sshkey_is_cert(k)) {
1.1 djm 1277: sshkey_free(k);
1.63 djm 1278: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1279: }
1.63 djm 1280: if (ret->cert != NULL)
1281: cert_free(ret->cert);
1282: ret->cert = k->cert;
1283: k->cert = NULL;
1284: }
1285: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1286: #ifdef WITH_OPENSSL
1.63 djm 1287: case KEY_RSA:
1288: RSA_free(ret->rsa);
1289: ret->rsa = k->rsa;
1290: k->rsa = NULL;
1.1 djm 1291: #ifdef DEBUG_PK
1.63 djm 1292: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1293: #endif
1.63 djm 1294: break;
1295: case KEY_DSA:
1296: DSA_free(ret->dsa);
1297: ret->dsa = k->dsa;
1298: k->dsa = NULL;
1.1 djm 1299: #ifdef DEBUG_PK
1.63 djm 1300: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1301: #endif
1.63 djm 1302: break;
1303: case KEY_ECDSA:
1304: EC_KEY_free(ret->ecdsa);
1305: ret->ecdsa = k->ecdsa;
1306: ret->ecdsa_nid = k->ecdsa_nid;
1307: k->ecdsa = NULL;
1308: k->ecdsa_nid = -1;
1.1 djm 1309: #ifdef DEBUG_PK
1.63 djm 1310: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1311: #endif
1.63 djm 1312: break;
1.1 djm 1313: #endif /* WITH_OPENSSL */
1.63 djm 1314: case KEY_ED25519:
1315: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1316: ret->ed25519_pk = k->ed25519_pk;
1317: k->ed25519_pk = NULL;
1.1 djm 1318: #ifdef DEBUG_PK
1.63 djm 1319: /* XXX */
1.1 djm 1320: #endif
1.63 djm 1321: break;
1.62 markus 1322: #ifdef WITH_XMSS
1.63 djm 1323: case KEY_XMSS:
1324: free(ret->xmss_pk);
1325: ret->xmss_pk = k->xmss_pk;
1326: k->xmss_pk = NULL;
1327: free(ret->xmss_state);
1328: ret->xmss_state = k->xmss_state;
1329: k->xmss_state = NULL;
1330: free(ret->xmss_name);
1331: ret->xmss_name = k->xmss_name;
1332: k->xmss_name = NULL;
1333: free(ret->xmss_filename);
1334: ret->xmss_filename = k->xmss_filename;
1335: k->xmss_filename = NULL;
1.62 markus 1336: #ifdef DEBUG_PK
1.63 djm 1337: /* XXX */
1.62 markus 1338: #endif
1.63 djm 1339: break;
1.62 markus 1340: #endif /* WITH_XMSS */
1.63 djm 1341: default:
1.1 djm 1342: sshkey_free(k);
1.63 djm 1343: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1344: }
1.63 djm 1345: sshkey_free(k);
1346:
1347: /* success */
1348: *cpp = cp;
1349: return 0;
1.1 djm 1350: }
1351:
1352: int
1.19 djm 1353: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1354: {
1.19 djm 1355: int r = SSH_ERR_INTERNAL_ERROR;
1356: struct sshbuf *b = NULL;
1.1 djm 1357: char *uu = NULL;
1.19 djm 1358:
1359: if (b64p != NULL)
1360: *b64p = NULL;
1361: if ((b = sshbuf_new()) == NULL)
1362: return SSH_ERR_ALLOC_FAIL;
1363: if ((r = sshkey_putb(key, b)) != 0)
1364: goto out;
1365: if ((uu = sshbuf_dtob64(b)) == NULL) {
1366: r = SSH_ERR_ALLOC_FAIL;
1367: goto out;
1368: }
1369: /* Success */
1370: if (b64p != NULL) {
1371: *b64p = uu;
1372: uu = NULL;
1373: }
1374: r = 0;
1375: out:
1376: sshbuf_free(b);
1377: free(uu);
1378: return r;
1379: }
1380:
1.52 djm 1381: int
1.19 djm 1382: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1383: {
1384: int r = SSH_ERR_INTERNAL_ERROR;
1385: char *uu = NULL;
1386:
1.48 djm 1387: if ((r = sshkey_to_base64(key, &uu)) != 0)
1388: goto out;
1389: if ((r = sshbuf_putf(b, "%s %s",
1390: sshkey_ssh_name(key), uu)) != 0)
1391: goto out;
1.19 djm 1392: r = 0;
1393: out:
1394: free(uu);
1395: return r;
1396: }
1397:
1398: int
1399: sshkey_write(const struct sshkey *key, FILE *f)
1400: {
1401: struct sshbuf *b = NULL;
1402: int r = SSH_ERR_INTERNAL_ERROR;
1403:
1404: if ((b = sshbuf_new()) == NULL)
1405: return SSH_ERR_ALLOC_FAIL;
1406: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1407: goto out;
1408: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1409: if (feof(f))
1410: errno = EPIPE;
1.19 djm 1411: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1412: goto out;
1413: }
1.19 djm 1414: /* Success */
1415: r = 0;
1.1 djm 1416: out:
1.19 djm 1417: sshbuf_free(b);
1418: return r;
1.1 djm 1419: }
1420:
1421: const char *
1422: sshkey_cert_type(const struct sshkey *k)
1423: {
1424: switch (k->cert->type) {
1425: case SSH2_CERT_TYPE_USER:
1426: return "user";
1427: case SSH2_CERT_TYPE_HOST:
1428: return "host";
1429: default:
1430: return "unknown";
1431: }
1432: }
1433:
1434: #ifdef WITH_OPENSSL
1435: static int
1436: rsa_generate_private_key(u_int bits, RSA **rsap)
1437: {
1438: RSA *private = NULL;
1439: BIGNUM *f4 = NULL;
1440: int ret = SSH_ERR_INTERNAL_ERROR;
1441:
1.49 djm 1442: if (rsap == NULL)
1443: return SSH_ERR_INVALID_ARGUMENT;
1444: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1445: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1446: return SSH_ERR_KEY_LENGTH;
1.1 djm 1447: *rsap = NULL;
1448: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1449: ret = SSH_ERR_ALLOC_FAIL;
1450: goto out;
1451: }
1452: if (!BN_set_word(f4, RSA_F4) ||
1453: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1454: ret = SSH_ERR_LIBCRYPTO_ERROR;
1455: goto out;
1456: }
1457: *rsap = private;
1458: private = NULL;
1459: ret = 0;
1460: out:
1.60 jsing 1461: RSA_free(private);
1462: BN_free(f4);
1.1 djm 1463: return ret;
1464: }
1465:
1466: static int
1467: dsa_generate_private_key(u_int bits, DSA **dsap)
1468: {
1469: DSA *private;
1470: int ret = SSH_ERR_INTERNAL_ERROR;
1471:
1.49 djm 1472: if (dsap == NULL)
1.1 djm 1473: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1474: if (bits != 1024)
1475: return SSH_ERR_KEY_LENGTH;
1.1 djm 1476: if ((private = DSA_new()) == NULL) {
1477: ret = SSH_ERR_ALLOC_FAIL;
1478: goto out;
1479: }
1480: *dsap = NULL;
1481: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1482: NULL, NULL) || !DSA_generate_key(private)) {
1483: ret = SSH_ERR_LIBCRYPTO_ERROR;
1484: goto out;
1485: }
1486: *dsap = private;
1487: private = NULL;
1488: ret = 0;
1489: out:
1.60 jsing 1490: DSA_free(private);
1.1 djm 1491: return ret;
1492: }
1493:
1494: int
1495: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1496: {
1497: EC_GROUP *eg;
1498: int nids[] = {
1499: NID_X9_62_prime256v1,
1500: NID_secp384r1,
1501: NID_secp521r1,
1502: -1
1503: };
1504: int nid;
1505: u_int i;
1506: BN_CTX *bnctx;
1507: const EC_GROUP *g = EC_KEY_get0_group(k);
1508:
1509: /*
1510: * The group may be stored in a ASN.1 encoded private key in one of two
1511: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1512: * or explicit group parameters encoded into the key blob. Only the
1513: * "named group" case sets the group NID for us, but we can figure
1514: * it out for the other case by comparing against all the groups that
1515: * are supported.
1516: */
1517: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1518: return nid;
1519: if ((bnctx = BN_CTX_new()) == NULL)
1520: return -1;
1521: for (i = 0; nids[i] != -1; i++) {
1522: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1523: BN_CTX_free(bnctx);
1524: return -1;
1525: }
1526: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1527: break;
1528: EC_GROUP_free(eg);
1529: }
1530: BN_CTX_free(bnctx);
1531: if (nids[i] != -1) {
1532: /* Use the group with the NID attached */
1533: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1534: if (EC_KEY_set_group(k, eg) != 1) {
1535: EC_GROUP_free(eg);
1536: return -1;
1537: }
1538: }
1539: return nids[i];
1540: }
1541:
1542: static int
1543: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1544: {
1545: EC_KEY *private;
1546: int ret = SSH_ERR_INTERNAL_ERROR;
1547:
1.50 djm 1548: if (nid == NULL || ecdsap == NULL)
1.1 djm 1549: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1550: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1551: return SSH_ERR_KEY_LENGTH;
1.1 djm 1552: *ecdsap = NULL;
1553: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1554: ret = SSH_ERR_ALLOC_FAIL;
1555: goto out;
1556: }
1557: if (EC_KEY_generate_key(private) != 1) {
1558: ret = SSH_ERR_LIBCRYPTO_ERROR;
1559: goto out;
1560: }
1561: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1562: *ecdsap = private;
1563: private = NULL;
1564: ret = 0;
1565: out:
1.60 jsing 1566: EC_KEY_free(private);
1.1 djm 1567: return ret;
1568: }
1569: #endif /* WITH_OPENSSL */
1570:
1571: int
1572: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1573: {
1574: struct sshkey *k;
1575: int ret = SSH_ERR_INTERNAL_ERROR;
1576:
1577: if (keyp == NULL)
1578: return SSH_ERR_INVALID_ARGUMENT;
1579: *keyp = NULL;
1580: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1581: return SSH_ERR_ALLOC_FAIL;
1582: switch (type) {
1583: case KEY_ED25519:
1584: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1585: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1586: ret = SSH_ERR_ALLOC_FAIL;
1587: break;
1588: }
1589: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1590: ret = 0;
1591: break;
1.62 markus 1592: #ifdef WITH_XMSS
1593: case KEY_XMSS:
1594: ret = sshkey_xmss_generate_private_key(k, bits);
1595: break;
1596: #endif /* WITH_XMSS */
1.1 djm 1597: #ifdef WITH_OPENSSL
1598: case KEY_DSA:
1599: ret = dsa_generate_private_key(bits, &k->dsa);
1600: break;
1601: case KEY_ECDSA:
1602: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1603: &k->ecdsa);
1604: break;
1605: case KEY_RSA:
1606: ret = rsa_generate_private_key(bits, &k->rsa);
1607: break;
1608: #endif /* WITH_OPENSSL */
1609: default:
1610: ret = SSH_ERR_INVALID_ARGUMENT;
1611: }
1612: if (ret == 0) {
1613: k->type = type;
1614: *keyp = k;
1615: } else
1616: sshkey_free(k);
1617: return ret;
1618: }
1619:
1620: int
1621: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1622: {
1623: u_int i;
1624: const struct sshkey_cert *from;
1625: struct sshkey_cert *to;
1.67 djm 1626: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1627:
1.67 djm 1628: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1629: return SSH_ERR_INVALID_ARGUMENT;
1630:
1.67 djm 1631: if ((to = cert_new()) == NULL)
1.1 djm 1632: return SSH_ERR_ALLOC_FAIL;
1633:
1.67 djm 1634: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1635: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1636: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1637: goto out;
1.1 djm 1638:
1639: to->serial = from->serial;
1640: to->type = from->type;
1641: if (from->key_id == NULL)
1642: to->key_id = NULL;
1.67 djm 1643: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1644: r = SSH_ERR_ALLOC_FAIL;
1645: goto out;
1646: }
1.1 djm 1647: to->valid_after = from->valid_after;
1648: to->valid_before = from->valid_before;
1649: if (from->signature_key == NULL)
1650: to->signature_key = NULL;
1.67 djm 1651: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1652: &to->signature_key)) != 0)
1.67 djm 1653: goto out;
1654: if (from->signature_type != NULL &&
1655: (to->signature_type = strdup(from->signature_type)) == NULL) {
1656: r = SSH_ERR_ALLOC_FAIL;
1657: goto out;
1658: }
1659: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1660: r = SSH_ERR_INVALID_ARGUMENT;
1661: goto out;
1662: }
1.1 djm 1663: if (from->nprincipals > 0) {
1664: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1665: sizeof(*to->principals))) == NULL) {
1666: r = SSH_ERR_ALLOC_FAIL;
1667: goto out;
1668: }
1.1 djm 1669: for (i = 0; i < from->nprincipals; i++) {
1670: to->principals[i] = strdup(from->principals[i]);
1671: if (to->principals[i] == NULL) {
1672: to->nprincipals = i;
1.67 djm 1673: r = SSH_ERR_ALLOC_FAIL;
1674: goto out;
1.1 djm 1675: }
1676: }
1677: }
1678: to->nprincipals = from->nprincipals;
1.67 djm 1679:
1680: /* success */
1681: cert_free(to_key->cert);
1682: to_key->cert = to;
1683: to = NULL;
1684: r = 0;
1685: out:
1686: cert_free(to);
1687: return r;
1.1 djm 1688: }
1689:
1690: int
1691: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1692: {
1693: struct sshkey *n = NULL;
1.69 djm 1694: int r = SSH_ERR_INTERNAL_ERROR;
1695: #ifdef WITH_OPENSSL
1696: const BIGNUM *rsa_n, *rsa_e;
1697: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1698: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1699: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1700: BIGNUM *dsa_pub_key_dup = NULL;
1701: #endif /* WITH_OPENSSL */
1.1 djm 1702:
1.24 djm 1703: *pkp = NULL;
1.1 djm 1704: switch (k->type) {
1705: #ifdef WITH_OPENSSL
1706: case KEY_DSA:
1707: case KEY_DSA_CERT:
1.69 djm 1708: if ((n = sshkey_new(k->type)) == NULL) {
1709: r = SSH_ERR_ALLOC_FAIL;
1710: goto out;
1711: }
1712:
1713: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1714: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1715: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1716: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1717: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1718: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1719: r = SSH_ERR_ALLOC_FAIL;
1720: goto out;
1721: }
1722: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1723: r = SSH_ERR_LIBCRYPTO_ERROR;
1724: goto out;
1.1 djm 1725: }
1.69 djm 1726: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1727: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1728: r = SSH_ERR_LIBCRYPTO_ERROR;
1729: goto out;
1730: }
1731: dsa_pub_key_dup = NULL; /* transferred */
1732:
1.1 djm 1733: break;
1734: case KEY_ECDSA:
1735: case KEY_ECDSA_CERT:
1.69 djm 1736: if ((n = sshkey_new(k->type)) == NULL) {
1737: r = SSH_ERR_ALLOC_FAIL;
1738: goto out;
1739: }
1.1 djm 1740: n->ecdsa_nid = k->ecdsa_nid;
1741: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1742: if (n->ecdsa == NULL) {
1.69 djm 1743: r = SSH_ERR_ALLOC_FAIL;
1744: goto out;
1.1 djm 1745: }
1746: if (EC_KEY_set_public_key(n->ecdsa,
1747: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1748: r = SSH_ERR_LIBCRYPTO_ERROR;
1749: goto out;
1.1 djm 1750: }
1751: break;
1752: case KEY_RSA:
1753: case KEY_RSA_CERT:
1.69 djm 1754: if ((n = sshkey_new(k->type)) == NULL) {
1755: r = SSH_ERR_ALLOC_FAIL;
1756: goto out;
1.1 djm 1757: }
1.69 djm 1758: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1759: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1760: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1761: r = SSH_ERR_ALLOC_FAIL;
1762: goto out;
1763: }
1764: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1765: r = SSH_ERR_LIBCRYPTO_ERROR;
1766: goto out;
1767: }
1768: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1769: break;
1770: #endif /* WITH_OPENSSL */
1771: case KEY_ED25519:
1772: case KEY_ED25519_CERT:
1.69 djm 1773: if ((n = sshkey_new(k->type)) == NULL) {
1774: r = SSH_ERR_ALLOC_FAIL;
1775: goto out;
1776: }
1.1 djm 1777: if (k->ed25519_pk != NULL) {
1778: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1779: r = SSH_ERR_ALLOC_FAIL;
1780: goto out;
1.1 djm 1781: }
1782: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1783: }
1784: break;
1.62 markus 1785: #ifdef WITH_XMSS
1786: case KEY_XMSS:
1787: case KEY_XMSS_CERT:
1.69 djm 1788: if ((n = sshkey_new(k->type)) == NULL) {
1789: r = SSH_ERR_ALLOC_FAIL;
1790: goto out;
1.62 markus 1791: }
1.69 djm 1792: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1793: goto out;
1.62 markus 1794: if (k->xmss_pk != NULL) {
1795: size_t pklen = sshkey_xmss_pklen(k);
1796: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1797: r = SSH_ERR_INTERNAL_ERROR;
1798: goto out;
1.62 markus 1799: }
1800: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1801: r = SSH_ERR_ALLOC_FAIL;
1802: goto out;
1.62 markus 1803: }
1804: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1805: }
1806: break;
1807: #endif /* WITH_XMSS */
1.1 djm 1808: default:
1.69 djm 1809: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1810: goto out;
1.1 djm 1811: }
1.69 djm 1812: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1813: goto out;
1814: /* success */
1.1 djm 1815: *pkp = n;
1.69 djm 1816: n = NULL;
1817: r = 0;
1818: out:
1819: sshkey_free(n);
1820: BN_clear_free(rsa_n_dup);
1821: BN_clear_free(rsa_e_dup);
1822: BN_clear_free(dsa_p_dup);
1823: BN_clear_free(dsa_q_dup);
1824: BN_clear_free(dsa_g_dup);
1825: BN_clear_free(dsa_pub_key_dup);
1826:
1827: return r;
1.1 djm 1828: }
1829:
1830: static int
1.14 djm 1831: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1832: {
1.14 djm 1833: struct sshbuf *principals = NULL, *crit = NULL;
1834: struct sshbuf *exts = NULL, *ca = NULL;
1835: u_char *sig = NULL;
1836: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1837: int ret = SSH_ERR_INTERNAL_ERROR;
1838:
1839: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1840: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1841: return ret;
1842:
1.20 djm 1843: /* Parse body of certificate up to signature */
1844: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1845: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1846: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1847: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1848: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1849: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1850: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1851: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1852: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1853: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1854: /* XXX debug print error for ret */
1855: ret = SSH_ERR_INVALID_FORMAT;
1856: goto out;
1857: }
1858:
1859: /* Signature is left in the buffer so we can calculate this length */
1860: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1861:
1862: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1863: ret = SSH_ERR_INVALID_FORMAT;
1864: goto out;
1865: }
1866:
1867: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1868: key->cert->type != SSH2_CERT_TYPE_HOST) {
1869: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1870: goto out;
1871: }
1872:
1.4 djm 1873: /* Parse principals section */
1874: while (sshbuf_len(principals) > 0) {
1875: char *principal = NULL;
1876: char **oprincipals = NULL;
1877:
1.1 djm 1878: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1879: ret = SSH_ERR_INVALID_FORMAT;
1880: goto out;
1881: }
1.4 djm 1882: if ((ret = sshbuf_get_cstring(principals, &principal,
1883: NULL)) != 0) {
1.1 djm 1884: ret = SSH_ERR_INVALID_FORMAT;
1885: goto out;
1886: }
1887: oprincipals = key->cert->principals;
1.51 deraadt 1888: key->cert->principals = recallocarray(key->cert->principals,
1889: key->cert->nprincipals, key->cert->nprincipals + 1,
1890: sizeof(*key->cert->principals));
1.1 djm 1891: if (key->cert->principals == NULL) {
1892: free(principal);
1893: key->cert->principals = oprincipals;
1894: ret = SSH_ERR_ALLOC_FAIL;
1895: goto out;
1896: }
1897: key->cert->principals[key->cert->nprincipals++] = principal;
1898: }
1899:
1.4 djm 1900: /*
1901: * Stash a copies of the critical options and extensions sections
1902: * for later use.
1903: */
1904: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1905: (exts != NULL &&
1906: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1907: goto out;
1908:
1.4 djm 1909: /*
1910: * Validate critical options and extensions sections format.
1911: */
1912: while (sshbuf_len(crit) != 0) {
1913: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1914: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1915: sshbuf_reset(key->cert->critical);
1.1 djm 1916: ret = SSH_ERR_INVALID_FORMAT;
1917: goto out;
1918: }
1919: }
1.4 djm 1920: while (exts != NULL && sshbuf_len(exts) != 0) {
1921: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1922: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1923: sshbuf_reset(key->cert->extensions);
1.1 djm 1924: ret = SSH_ERR_INVALID_FORMAT;
1925: goto out;
1926: }
1927: }
1928:
1.4 djm 1929: /* Parse CA key and check signature */
1.14 djm 1930: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1931: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1932: goto out;
1933: }
1934: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1935: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1936: goto out;
1937: }
1938: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 1939: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 1940: goto out;
1.67 djm 1941: if ((ret = get_sigtype(sig, slen, &key->cert->signature_type)) != 0)
1942: goto out;
1.4 djm 1943:
1944: /* Success */
1.1 djm 1945: ret = 0;
1946: out:
1.14 djm 1947: sshbuf_free(ca);
1.4 djm 1948: sshbuf_free(crit);
1949: sshbuf_free(exts);
1950: sshbuf_free(principals);
1.1 djm 1951: free(sig);
1952: return ret;
1953: }
1954:
1955: static int
1.69 djm 1956: check_rsa_length(const RSA *rsa)
1957: {
1958: const BIGNUM *rsa_n;
1959:
1960: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
1961: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
1962: return SSH_ERR_KEY_LENGTH;
1963: return 0;
1964: }
1965:
1966: static int
1.14 djm 1967: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1968: int allow_cert)
1.1 djm 1969: {
1.12 djm 1970: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 1971: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 1972: struct sshkey *key = NULL;
1973: size_t len;
1974: u_char *pk = NULL;
1.14 djm 1975: struct sshbuf *copy;
1.1 djm 1976: #ifdef WITH_OPENSSL
1977: EC_POINT *q = NULL;
1.69 djm 1978: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
1979: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 1980: #endif /* WITH_OPENSSL */
1981:
1982: #ifdef DEBUG_PK /* XXX */
1.14 djm 1983: sshbuf_dump(b, stderr);
1.1 djm 1984: #endif
1.32 djm 1985: if (keyp != NULL)
1986: *keyp = NULL;
1.14 djm 1987: if ((copy = sshbuf_fromb(b)) == NULL) {
1988: ret = SSH_ERR_ALLOC_FAIL;
1989: goto out;
1990: }
1.1 djm 1991: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1992: ret = SSH_ERR_INVALID_FORMAT;
1993: goto out;
1994: }
1995:
1996: type = sshkey_type_from_name(ktype);
1997: if (!allow_cert && sshkey_type_is_cert(type)) {
1998: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1999: goto out;
2000: }
2001: switch (type) {
2002: #ifdef WITH_OPENSSL
2003: case KEY_RSA_CERT:
1.14 djm 2004: /* Skip nonce */
1.1 djm 2005: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2006: ret = SSH_ERR_INVALID_FORMAT;
2007: goto out;
2008: }
2009: /* FALLTHROUGH */
2010: case KEY_RSA:
2011: if ((key = sshkey_new(type)) == NULL) {
2012: ret = SSH_ERR_ALLOC_FAIL;
2013: goto out;
2014: }
1.73 djm 2015: if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
2016: sshbuf_get_bignum2(b, &rsa_n) != 0) {
1.1 djm 2017: ret = SSH_ERR_INVALID_FORMAT;
2018: goto out;
2019: }
1.69 djm 2020: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2021: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2022: goto out;
2023: }
1.69 djm 2024: rsa_n = rsa_e = NULL; /* transferred */
2025: if ((ret = check_rsa_length(key->rsa)) != 0)
2026: goto out;
1.1 djm 2027: #ifdef DEBUG_PK
2028: RSA_print_fp(stderr, key->rsa, 8);
2029: #endif
2030: break;
2031: case KEY_DSA_CERT:
1.14 djm 2032: /* Skip nonce */
1.1 djm 2033: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2034: ret = SSH_ERR_INVALID_FORMAT;
2035: goto out;
2036: }
2037: /* FALLTHROUGH */
2038: case KEY_DSA:
2039: if ((key = sshkey_new(type)) == NULL) {
2040: ret = SSH_ERR_ALLOC_FAIL;
2041: goto out;
2042: }
1.73 djm 2043: if (sshbuf_get_bignum2(b, &dsa_p) != 0 ||
2044: sshbuf_get_bignum2(b, &dsa_q) != 0 ||
2045: sshbuf_get_bignum2(b, &dsa_g) != 0 ||
2046: sshbuf_get_bignum2(b, &dsa_pub_key) != 0) {
1.1 djm 2047: ret = SSH_ERR_INVALID_FORMAT;
2048: goto out;
2049: }
1.69 djm 2050: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2051: ret = SSH_ERR_LIBCRYPTO_ERROR;
2052: goto out;
2053: }
2054: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2055: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2056: ret = SSH_ERR_LIBCRYPTO_ERROR;
2057: goto out;
2058: }
2059: dsa_pub_key = NULL; /* transferred */
1.1 djm 2060: #ifdef DEBUG_PK
2061: DSA_print_fp(stderr, key->dsa, 8);
2062: #endif
2063: break;
2064: case KEY_ECDSA_CERT:
1.14 djm 2065: /* Skip nonce */
1.1 djm 2066: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2067: ret = SSH_ERR_INVALID_FORMAT;
2068: goto out;
2069: }
2070: /* FALLTHROUGH */
2071: case KEY_ECDSA:
2072: if ((key = sshkey_new(type)) == NULL) {
2073: ret = SSH_ERR_ALLOC_FAIL;
2074: goto out;
2075: }
1.12 djm 2076: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2077: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2078: ret = SSH_ERR_INVALID_FORMAT;
2079: goto out;
2080: }
2081: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2082: ret = SSH_ERR_EC_CURVE_MISMATCH;
2083: goto out;
2084: }
1.60 jsing 2085: EC_KEY_free(key->ecdsa);
1.1 djm 2086: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2087: == NULL) {
2088: ret = SSH_ERR_EC_CURVE_INVALID;
2089: goto out;
2090: }
2091: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2092: ret = SSH_ERR_ALLOC_FAIL;
2093: goto out;
2094: }
2095: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2096: ret = SSH_ERR_INVALID_FORMAT;
2097: goto out;
2098: }
2099: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2100: q) != 0) {
2101: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2102: goto out;
2103: }
2104: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2105: /* XXX assume it is a allocation error */
2106: ret = SSH_ERR_ALLOC_FAIL;
2107: goto out;
2108: }
2109: #ifdef DEBUG_PK
2110: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2111: #endif
2112: break;
2113: #endif /* WITH_OPENSSL */
2114: case KEY_ED25519_CERT:
1.14 djm 2115: /* Skip nonce */
1.1 djm 2116: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2117: ret = SSH_ERR_INVALID_FORMAT;
2118: goto out;
2119: }
2120: /* FALLTHROUGH */
2121: case KEY_ED25519:
2122: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2123: goto out;
2124: if (len != ED25519_PK_SZ) {
2125: ret = SSH_ERR_INVALID_FORMAT;
2126: goto out;
2127: }
2128: if ((key = sshkey_new(type)) == NULL) {
2129: ret = SSH_ERR_ALLOC_FAIL;
2130: goto out;
2131: }
2132: key->ed25519_pk = pk;
2133: pk = NULL;
2134: break;
1.62 markus 2135: #ifdef WITH_XMSS
2136: case KEY_XMSS_CERT:
2137: /* Skip nonce */
2138: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2139: ret = SSH_ERR_INVALID_FORMAT;
2140: goto out;
2141: }
2142: /* FALLTHROUGH */
2143: case KEY_XMSS:
2144: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2145: goto out;
2146: if ((key = sshkey_new(type)) == NULL) {
2147: ret = SSH_ERR_ALLOC_FAIL;
2148: goto out;
2149: }
2150: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2151: goto out;
2152: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2153: goto out;
2154: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2155: ret = SSH_ERR_INVALID_FORMAT;
2156: goto out;
2157: }
2158: key->xmss_pk = pk;
2159: pk = NULL;
2160: if (type != KEY_XMSS_CERT &&
2161: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2162: goto out;
2163: break;
2164: #endif /* WITH_XMSS */
1.1 djm 2165: case KEY_UNSPEC:
2166: default:
2167: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2168: goto out;
2169: }
2170:
2171: /* Parse certificate potion */
1.14 djm 2172: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2173: goto out;
2174:
2175: if (key != NULL && sshbuf_len(b) != 0) {
2176: ret = SSH_ERR_INVALID_FORMAT;
2177: goto out;
2178: }
2179: ret = 0;
1.32 djm 2180: if (keyp != NULL) {
2181: *keyp = key;
2182: key = NULL;
2183: }
1.1 djm 2184: out:
1.14 djm 2185: sshbuf_free(copy);
1.1 djm 2186: sshkey_free(key);
1.62 markus 2187: free(xmss_name);
1.1 djm 2188: free(ktype);
2189: free(curve);
2190: free(pk);
2191: #ifdef WITH_OPENSSL
1.60 jsing 2192: EC_POINT_free(q);
1.69 djm 2193: BN_clear_free(rsa_n);
2194: BN_clear_free(rsa_e);
2195: BN_clear_free(dsa_p);
2196: BN_clear_free(dsa_q);
2197: BN_clear_free(dsa_g);
2198: BN_clear_free(dsa_pub_key);
1.1 djm 2199: #endif /* WITH_OPENSSL */
2200: return ret;
2201: }
2202:
2203: int
2204: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2205: {
1.14 djm 2206: struct sshbuf *b;
2207: int r;
2208:
2209: if ((b = sshbuf_from(blob, blen)) == NULL)
2210: return SSH_ERR_ALLOC_FAIL;
2211: r = sshkey_from_blob_internal(b, keyp, 1);
2212: sshbuf_free(b);
2213: return r;
2214: }
2215:
2216: int
2217: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2218: {
2219: return sshkey_from_blob_internal(b, keyp, 1);
2220: }
2221:
2222: int
2223: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2224: {
2225: struct sshbuf *b;
2226: int r;
2227:
2228: if ((r = sshbuf_froms(buf, &b)) != 0)
2229: return r;
2230: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2231: sshbuf_free(b);
2232: return r;
2233: }
2234:
1.65 djm 2235: static int
2236: get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2237: {
2238: int r;
2239: struct sshbuf *b = NULL;
2240: char *sigtype = NULL;
2241:
2242: if (sigtypep != NULL)
2243: *sigtypep = NULL;
2244: if ((b = sshbuf_from(sig, siglen)) == NULL)
2245: return SSH_ERR_ALLOC_FAIL;
2246: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2247: goto out;
2248: /* success */
2249: if (sigtypep != NULL) {
2250: *sigtypep = sigtype;
2251: sigtype = NULL;
2252: }
2253: r = 0;
2254: out:
2255: free(sigtype);
1.14 djm 2256: sshbuf_free(b);
2257: return r;
1.68 djm 2258: }
2259:
2260: /*
2261: *
2262: * Checks whether a certificate's signature type is allowed.
2263: * Returns 0 (success) if the certificate signature type appears in the
2264: * "allowed" pattern-list, or the key is not a certificate to begin with.
2265: * Otherwise returns a ssherr.h code.
2266: */
2267: int
2268: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2269: {
2270: if (key == NULL || allowed == NULL)
2271: return SSH_ERR_INVALID_ARGUMENT;
2272: if (!sshkey_type_is_cert(key->type))
2273: return 0;
2274: if (key->cert == NULL || key->cert->signature_type == NULL)
2275: return SSH_ERR_INVALID_ARGUMENT;
2276: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2277: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2278: return 0;
1.65 djm 2279: }
2280:
2281: /*
2282: * Returns the expected signature algorithm for a given public key algorithm.
2283: */
1.66 djm 2284: const char *
2285: sshkey_sigalg_by_name(const char *name)
1.65 djm 2286: {
2287: const struct keytype *kt;
2288:
2289: for (kt = keytypes; kt->type != -1; kt++) {
2290: if (strcmp(kt->name, name) != 0)
2291: continue;
2292: if (kt->sigalg != NULL)
2293: return kt->sigalg;
2294: if (!kt->cert)
2295: return kt->name;
2296: return sshkey_ssh_name_from_type_nid(
2297: sshkey_type_plain(kt->type), kt->nid);
2298: }
2299: return NULL;
2300: }
2301:
2302: /*
2303: * Verifies that the signature algorithm appearing inside the signature blob
2304: * matches that which was requested.
2305: */
2306: int
2307: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2308: const char *requested_alg)
2309: {
2310: const char *expected_alg;
2311: char *sigtype = NULL;
2312: int r;
2313:
2314: if (requested_alg == NULL)
2315: return 0;
1.66 djm 2316: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2317: return SSH_ERR_INVALID_ARGUMENT;
2318: if ((r = get_sigtype(sig, siglen, &sigtype)) != 0)
2319: return r;
2320: r = strcmp(expected_alg, sigtype) == 0;
2321: free(sigtype);
2322: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2323: }
2324:
2325: int
2326: sshkey_sign(const struct sshkey *key,
2327: u_char **sigp, size_t *lenp,
1.28 markus 2328: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2329: {
2330: if (sigp != NULL)
2331: *sigp = NULL;
2332: if (lenp != NULL)
2333: *lenp = 0;
2334: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2335: return SSH_ERR_INVALID_ARGUMENT;
2336: switch (key->type) {
2337: #ifdef WITH_OPENSSL
2338: case KEY_DSA_CERT:
2339: case KEY_DSA:
2340: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2341: case KEY_ECDSA_CERT:
2342: case KEY_ECDSA:
2343: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2344: case KEY_RSA_CERT:
2345: case KEY_RSA:
1.28 markus 2346: return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
1.1 djm 2347: #endif /* WITH_OPENSSL */
2348: case KEY_ED25519:
2349: case KEY_ED25519_CERT:
2350: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.62 markus 2351: #ifdef WITH_XMSS
2352: case KEY_XMSS:
2353: case KEY_XMSS_CERT:
2354: return ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2355: #endif /* WITH_XMSS */
1.1 djm 2356: default:
2357: return SSH_ERR_KEY_TYPE_UNKNOWN;
2358: }
2359: }
2360:
2361: /*
2362: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2363: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2364: */
2365: int
2366: sshkey_verify(const struct sshkey *key,
2367: const u_char *sig, size_t siglen,
1.59 djm 2368: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2369: {
1.6 djm 2370: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2371: return SSH_ERR_INVALID_ARGUMENT;
2372: switch (key->type) {
2373: #ifdef WITH_OPENSSL
2374: case KEY_DSA_CERT:
2375: case KEY_DSA:
2376: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2377: case KEY_ECDSA_CERT:
2378: case KEY_ECDSA:
2379: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2380: case KEY_RSA_CERT:
2381: case KEY_RSA:
1.59 djm 2382: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2383: #endif /* WITH_OPENSSL */
2384: case KEY_ED25519:
2385: case KEY_ED25519_CERT:
2386: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.62 markus 2387: #ifdef WITH_XMSS
2388: case KEY_XMSS:
2389: case KEY_XMSS_CERT:
2390: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2391: #endif /* WITH_XMSS */
1.1 djm 2392: default:
2393: return SSH_ERR_KEY_TYPE_UNKNOWN;
2394: }
2395: }
2396:
2397: /* Convert a plain key to their _CERT equivalent */
2398: int
1.20 djm 2399: sshkey_to_certified(struct sshkey *k)
1.1 djm 2400: {
2401: int newtype;
2402:
2403: switch (k->type) {
2404: #ifdef WITH_OPENSSL
2405: case KEY_RSA:
1.20 djm 2406: newtype = KEY_RSA_CERT;
1.1 djm 2407: break;
2408: case KEY_DSA:
1.20 djm 2409: newtype = KEY_DSA_CERT;
1.1 djm 2410: break;
2411: case KEY_ECDSA:
2412: newtype = KEY_ECDSA_CERT;
2413: break;
2414: #endif /* WITH_OPENSSL */
2415: case KEY_ED25519:
2416: newtype = KEY_ED25519_CERT;
2417: break;
1.62 markus 2418: #ifdef WITH_XMSS
2419: case KEY_XMSS:
2420: newtype = KEY_XMSS_CERT;
2421: break;
2422: #endif /* WITH_XMSS */
1.1 djm 2423: default:
2424: return SSH_ERR_INVALID_ARGUMENT;
2425: }
2426: if ((k->cert = cert_new()) == NULL)
2427: return SSH_ERR_ALLOC_FAIL;
2428: k->type = newtype;
2429: return 0;
2430: }
2431:
2432: /* Convert a certificate to its raw key equivalent */
2433: int
2434: sshkey_drop_cert(struct sshkey *k)
2435: {
2436: if (!sshkey_type_is_cert(k->type))
2437: return SSH_ERR_KEY_TYPE_UNKNOWN;
2438: cert_free(k->cert);
2439: k->cert = NULL;
2440: k->type = sshkey_type_plain(k->type);
2441: return 0;
2442: }
2443:
2444: /* Sign a certified key, (re-)generating the signed certblob. */
2445: int
1.53 djm 2446: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2447: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2448: {
2449: struct sshbuf *principals = NULL;
2450: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2451: size_t i, ca_len, sig_len;
2452: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2453: struct sshbuf *cert = NULL;
2454: char *sigtype = NULL;
1.69 djm 2455: #ifdef WITH_OPENSSL
2456: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2457: #endif /* WITH_OPENSSL */
1.1 djm 2458:
2459: if (k == NULL || k->cert == NULL ||
2460: k->cert->certblob == NULL || ca == NULL)
2461: return SSH_ERR_INVALID_ARGUMENT;
2462: if (!sshkey_is_cert(k))
2463: return SSH_ERR_KEY_TYPE_UNKNOWN;
2464: if (!sshkey_type_is_valid_ca(ca->type))
2465: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2466:
1.67 djm 2467: /*
2468: * If no alg specified as argument but a signature_type was set,
2469: * then prefer that. If both were specified, then they must match.
2470: */
2471: if (alg == NULL)
2472: alg = k->cert->signature_type;
2473: else if (k->cert->signature_type != NULL &&
2474: strcmp(alg, k->cert->signature_type) != 0)
2475: return SSH_ERR_INVALID_ARGUMENT;
1.75 ! djm 2476:
! 2477: /*
! 2478: * If no signing algorithm or signature_type was specified and we're
! 2479: * using a RSA key, then default to a good signature algorithm.
! 2480: */
! 2481: if (alg == NULL && ca->type == KEY_RSA)
! 2482: alg = "rsa-sha2-512";
1.67 djm 2483:
1.1 djm 2484: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2485: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2486:
2487: cert = k->cert->certblob; /* for readability */
2488: sshbuf_reset(cert);
2489: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2490: goto out;
2491:
2492: /* -v01 certs put nonce first */
2493: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2494: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2495: goto out;
1.1 djm 2496:
2497: /* XXX this substantially duplicates to_blob(); refactor */
2498: switch (k->type) {
2499: #ifdef WITH_OPENSSL
2500: case KEY_DSA_CERT:
1.69 djm 2501: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2502: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2503: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2504: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2505: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2506: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2507: goto out;
2508: break;
2509: case KEY_ECDSA_CERT:
2510: if ((ret = sshbuf_put_cstring(cert,
2511: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2512: (ret = sshbuf_put_ec(cert,
2513: EC_KEY_get0_public_key(k->ecdsa),
2514: EC_KEY_get0_group(k->ecdsa))) != 0)
2515: goto out;
2516: break;
2517: case KEY_RSA_CERT:
1.69 djm 2518: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2519: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2520: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2521: goto out;
2522: break;
2523: #endif /* WITH_OPENSSL */
2524: case KEY_ED25519_CERT:
2525: if ((ret = sshbuf_put_string(cert,
2526: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2527: goto out;
2528: break;
1.62 markus 2529: #ifdef WITH_XMSS
2530: case KEY_XMSS_CERT:
2531: if (k->xmss_name == NULL) {
2532: ret = SSH_ERR_INVALID_ARGUMENT;
2533: goto out;
2534: }
2535: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2536: (ret = sshbuf_put_string(cert,
2537: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2538: goto out;
2539: break;
2540: #endif /* WITH_XMSS */
1.1 djm 2541: default:
2542: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2543: goto out;
1.1 djm 2544: }
2545:
1.20 djm 2546: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2547: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2548: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2549: goto out;
2550:
2551: if ((principals = sshbuf_new()) == NULL) {
2552: ret = SSH_ERR_ALLOC_FAIL;
2553: goto out;
2554: }
2555: for (i = 0; i < k->cert->nprincipals; i++) {
2556: if ((ret = sshbuf_put_cstring(principals,
2557: k->cert->principals[i])) != 0)
2558: goto out;
2559: }
2560: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2561: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2562: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2563: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2564: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2565: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2566: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2567: goto out;
2568:
2569: /* Sign the whole mess */
1.53 djm 2570: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2571: sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
1.1 djm 2572: goto out;
1.67 djm 2573: /* Check and update signature_type against what was actually used */
2574: if ((ret = get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
2575: goto out;
2576: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2577: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2578: goto out;
2579: }
2580: if (k->cert->signature_type == NULL) {
2581: k->cert->signature_type = sigtype;
2582: sigtype = NULL;
2583: }
1.1 djm 2584: /* Append signature and we are done */
2585: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2586: goto out;
2587: ret = 0;
2588: out:
2589: if (ret != 0)
2590: sshbuf_reset(cert);
1.29 mmcc 2591: free(sig_blob);
2592: free(ca_blob);
1.67 djm 2593: free(sigtype);
1.31 mmcc 2594: sshbuf_free(principals);
1.1 djm 2595: return ret;
1.53 djm 2596: }
2597:
2598: static int
2599: default_key_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
2600: const u_char *data, size_t datalen,
2601: const char *alg, u_int compat, void *ctx)
2602: {
2603: if (ctx != NULL)
2604: return SSH_ERR_INVALID_ARGUMENT;
2605: return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2606: }
2607:
2608: int
2609: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2610: {
2611: return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
1.1 djm 2612: }
2613:
2614: int
2615: sshkey_cert_check_authority(const struct sshkey *k,
2616: int want_host, int require_principal,
2617: const char *name, const char **reason)
2618: {
2619: u_int i, principal_matches;
2620: time_t now = time(NULL);
2621:
2622: if (reason != NULL)
2623: *reason = NULL;
2624:
2625: if (want_host) {
2626: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2627: *reason = "Certificate invalid: not a host certificate";
2628: return SSH_ERR_KEY_CERT_INVALID;
2629: }
2630: } else {
2631: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2632: *reason = "Certificate invalid: not a user certificate";
2633: return SSH_ERR_KEY_CERT_INVALID;
2634: }
2635: }
2636: if (now < 0) {
2637: /* yikes - system clock before epoch! */
2638: *reason = "Certificate invalid: not yet valid";
2639: return SSH_ERR_KEY_CERT_INVALID;
2640: }
2641: if ((u_int64_t)now < k->cert->valid_after) {
2642: *reason = "Certificate invalid: not yet valid";
2643: return SSH_ERR_KEY_CERT_INVALID;
2644: }
2645: if ((u_int64_t)now >= k->cert->valid_before) {
2646: *reason = "Certificate invalid: expired";
2647: return SSH_ERR_KEY_CERT_INVALID;
2648: }
2649: if (k->cert->nprincipals == 0) {
2650: if (require_principal) {
2651: *reason = "Certificate lacks principal list";
2652: return SSH_ERR_KEY_CERT_INVALID;
2653: }
2654: } else if (name != NULL) {
2655: principal_matches = 0;
2656: for (i = 0; i < k->cert->nprincipals; i++) {
2657: if (strcmp(name, k->cert->principals[i]) == 0) {
2658: principal_matches = 1;
2659: break;
2660: }
2661: }
2662: if (!principal_matches) {
2663: *reason = "Certificate invalid: name is not a listed "
2664: "principal";
2665: return SSH_ERR_KEY_CERT_INVALID;
2666: }
2667: }
2668: return 0;
1.27 djm 2669: }
2670:
2671: size_t
2672: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2673: {
2674: char from[32], to[32], ret[64];
2675: time_t tt;
2676: struct tm *tm;
2677:
2678: *from = *to = '\0';
2679: if (cert->valid_after == 0 &&
2680: cert->valid_before == 0xffffffffffffffffULL)
2681: return strlcpy(s, "forever", l);
2682:
2683: if (cert->valid_after != 0) {
2684: /* XXX revisit INT_MAX in 2038 :) */
2685: tt = cert->valid_after > INT_MAX ?
2686: INT_MAX : cert->valid_after;
2687: tm = localtime(&tt);
2688: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2689: }
2690: if (cert->valid_before != 0xffffffffffffffffULL) {
2691: /* XXX revisit INT_MAX in 2038 :) */
2692: tt = cert->valid_before > INT_MAX ?
2693: INT_MAX : cert->valid_before;
2694: tm = localtime(&tt);
2695: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2696: }
2697:
2698: if (cert->valid_after == 0)
2699: snprintf(ret, sizeof(ret), "before %s", to);
2700: else if (cert->valid_before == 0xffffffffffffffffULL)
2701: snprintf(ret, sizeof(ret), "after %s", from);
2702: else
2703: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2704:
2705: return strlcpy(s, ret, l);
1.1 djm 2706: }
2707:
2708: int
1.62 markus 2709: sshkey_private_serialize_opt(const struct sshkey *key, struct sshbuf *b,
2710: enum sshkey_serialize_rep opts)
1.1 djm 2711: {
2712: int r = SSH_ERR_INTERNAL_ERROR;
1.69 djm 2713: #ifdef WITH_OPENSSL
2714: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2715: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2716: #endif /* WITH_OPENSSL */
1.1 djm 2717:
2718: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2719: goto out;
2720: switch (key->type) {
2721: #ifdef WITH_OPENSSL
2722: case KEY_RSA:
1.69 djm 2723: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2724: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2725: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2726: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2727: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2728: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2729: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2730: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2731: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2732: goto out;
2733: break;
2734: case KEY_RSA_CERT:
2735: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2736: r = SSH_ERR_INVALID_ARGUMENT;
2737: goto out;
2738: }
1.69 djm 2739: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2740: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2741: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2742: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2743: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2744: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2745: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2746: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2747: goto out;
2748: break;
2749: case KEY_DSA:
1.69 djm 2750: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2751: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2752: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2753: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2754: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2755: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2756: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2757: goto out;
2758: break;
2759: case KEY_DSA_CERT:
2760: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2761: r = SSH_ERR_INVALID_ARGUMENT;
2762: goto out;
2763: }
1.69 djm 2764: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2765: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2766: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2767: goto out;
2768: break;
2769: case KEY_ECDSA:
2770: if ((r = sshbuf_put_cstring(b,
2771: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2772: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2773: (r = sshbuf_put_bignum2(b,
2774: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2775: goto out;
2776: break;
2777: case KEY_ECDSA_CERT:
2778: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2779: r = SSH_ERR_INVALID_ARGUMENT;
2780: goto out;
2781: }
2782: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2783: (r = sshbuf_put_bignum2(b,
2784: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2785: goto out;
2786: break;
2787: #endif /* WITH_OPENSSL */
2788: case KEY_ED25519:
2789: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2790: ED25519_PK_SZ)) != 0 ||
2791: (r = sshbuf_put_string(b, key->ed25519_sk,
2792: ED25519_SK_SZ)) != 0)
2793: goto out;
2794: break;
2795: case KEY_ED25519_CERT:
2796: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2797: r = SSH_ERR_INVALID_ARGUMENT;
2798: goto out;
2799: }
2800: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2801: (r = sshbuf_put_string(b, key->ed25519_pk,
2802: ED25519_PK_SZ)) != 0 ||
2803: (r = sshbuf_put_string(b, key->ed25519_sk,
2804: ED25519_SK_SZ)) != 0)
2805: goto out;
2806: break;
1.62 markus 2807: #ifdef WITH_XMSS
2808: case KEY_XMSS:
2809: if (key->xmss_name == NULL) {
2810: r = SSH_ERR_INVALID_ARGUMENT;
2811: goto out;
2812: }
2813: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2814: (r = sshbuf_put_string(b, key->xmss_pk,
2815: sshkey_xmss_pklen(key))) != 0 ||
2816: (r = sshbuf_put_string(b, key->xmss_sk,
2817: sshkey_xmss_sklen(key))) != 0 ||
2818: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2819: goto out;
2820: break;
2821: case KEY_XMSS_CERT:
2822: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2823: key->xmss_name == NULL) {
2824: r = SSH_ERR_INVALID_ARGUMENT;
2825: goto out;
2826: }
2827: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2828: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2829: (r = sshbuf_put_string(b, key->xmss_pk,
2830: sshkey_xmss_pklen(key))) != 0 ||
2831: (r = sshbuf_put_string(b, key->xmss_sk,
2832: sshkey_xmss_sklen(key))) != 0 ||
2833: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2834: goto out;
2835: break;
2836: #endif /* WITH_XMSS */
1.1 djm 2837: default:
2838: r = SSH_ERR_INVALID_ARGUMENT;
2839: goto out;
2840: }
2841: /* success */
2842: r = 0;
2843: out:
2844: return r;
2845: }
2846:
2847: int
1.62 markus 2848: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2849: {
2850: return sshkey_private_serialize_opt(key, b,
2851: SSHKEY_SERIALIZE_DEFAULT);
2852: }
2853:
2854: int
1.1 djm 2855: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2856: {
1.62 markus 2857: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2858: struct sshkey *k = NULL;
1.14 djm 2859: size_t pklen = 0, sklen = 0;
1.1 djm 2860: int type, r = SSH_ERR_INTERNAL_ERROR;
2861: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 2862: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2863: #ifdef WITH_OPENSSL
2864: BIGNUM *exponent = NULL;
1.69 djm 2865: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2866: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2867: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2868: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2869: #endif /* WITH_OPENSSL */
2870:
2871: if (kp != NULL)
2872: *kp = NULL;
2873: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2874: goto out;
2875: type = sshkey_type_from_name(tname);
2876: switch (type) {
2877: #ifdef WITH_OPENSSL
2878: case KEY_DSA:
1.70 djm 2879: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2880: r = SSH_ERR_ALLOC_FAIL;
2881: goto out;
2882: }
1.73 djm 2883: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
2884: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
2885: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
2886: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
2887: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 2888: goto out;
2889: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2890: r = SSH_ERR_LIBCRYPTO_ERROR;
2891: goto out;
2892: }
2893: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2894: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
2895: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2896: goto out;
1.69 djm 2897: }
2898: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 2899: break;
2900: case KEY_DSA_CERT:
1.14 djm 2901: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 2902: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 2903: goto out;
1.69 djm 2904: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2905: r = SSH_ERR_LIBCRYPTO_ERROR;
2906: goto out;
2907: }
2908: dsa_priv_key = NULL; /* transferred */
1.1 djm 2909: break;
2910: case KEY_ECDSA:
1.70 djm 2911: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2912: r = SSH_ERR_ALLOC_FAIL;
2913: goto out;
2914: }
2915: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2916: r = SSH_ERR_INVALID_ARGUMENT;
2917: goto out;
2918: }
2919: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2920: goto out;
2921: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2922: r = SSH_ERR_EC_CURVE_MISMATCH;
2923: goto out;
2924: }
2925: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 2926: if (k->ecdsa == NULL) {
1.1 djm 2927: r = SSH_ERR_LIBCRYPTO_ERROR;
2928: goto out;
2929: }
2930: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 2931: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 2932: goto out;
2933: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2934: r = SSH_ERR_LIBCRYPTO_ERROR;
2935: goto out;
2936: }
2937: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2938: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2939: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2940: goto out;
2941: break;
2942: case KEY_ECDSA_CERT:
1.14 djm 2943: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 2944: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 2945: goto out;
2946: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2947: r = SSH_ERR_LIBCRYPTO_ERROR;
2948: goto out;
2949: }
2950: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2951: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2952: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2953: goto out;
2954: break;
2955: case KEY_RSA:
1.70 djm 2956: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2957: r = SSH_ERR_ALLOC_FAIL;
2958: goto out;
2959: }
1.73 djm 2960: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
2961: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
2962: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
2963: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
2964: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
2965: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 2966: goto out;
1.69 djm 2967: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
2968: r = SSH_ERR_LIBCRYPTO_ERROR;
2969: goto out;
2970: }
2971: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
2972: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
2973: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2974: goto out;
2975: }
1.69 djm 2976: rsa_p = rsa_q = NULL; /* transferred */
2977: if ((r = check_rsa_length(k->rsa)) != 0)
2978: goto out;
2979: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
2980: goto out;
1.1 djm 2981: break;
2982: case KEY_RSA_CERT:
1.14 djm 2983: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 2984: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
2985: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
2986: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
2987: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 2988: goto out;
1.69 djm 2989: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
2990: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2991: goto out;
2992: }
1.69 djm 2993: rsa_d = NULL; /* transferred */
2994: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
2995: r = SSH_ERR_LIBCRYPTO_ERROR;
2996: goto out;
2997: }
2998: rsa_p = rsa_q = NULL; /* transferred */
2999: if ((r = check_rsa_length(k->rsa)) != 0)
3000: goto out;
3001: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3002: goto out;
1.1 djm 3003: break;
3004: #endif /* WITH_OPENSSL */
3005: case KEY_ED25519:
1.70 djm 3006: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3007: r = SSH_ERR_ALLOC_FAIL;
3008: goto out;
3009: }
3010: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3011: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3012: goto out;
3013: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3014: r = SSH_ERR_INVALID_FORMAT;
3015: goto out;
3016: }
3017: k->ed25519_pk = ed25519_pk;
3018: k->ed25519_sk = ed25519_sk;
3019: ed25519_pk = ed25519_sk = NULL;
3020: break;
3021: case KEY_ED25519_CERT:
1.14 djm 3022: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3023: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3024: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3025: goto out;
3026: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3027: r = SSH_ERR_INVALID_FORMAT;
3028: goto out;
3029: }
3030: k->ed25519_pk = ed25519_pk;
3031: k->ed25519_sk = ed25519_sk;
3032: ed25519_pk = ed25519_sk = NULL;
3033: break;
1.62 markus 3034: #ifdef WITH_XMSS
3035: case KEY_XMSS:
1.70 djm 3036: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3037: r = SSH_ERR_ALLOC_FAIL;
3038: goto out;
3039: }
3040: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3041: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3042: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3043: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3044: goto out;
3045: if (pklen != sshkey_xmss_pklen(k) ||
3046: sklen != sshkey_xmss_sklen(k)) {
3047: r = SSH_ERR_INVALID_FORMAT;
3048: goto out;
3049: }
3050: k->xmss_pk = xmss_pk;
3051: k->xmss_sk = xmss_sk;
3052: xmss_pk = xmss_sk = NULL;
3053: /* optional internal state */
3054: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3055: goto out;
3056: break;
3057: case KEY_XMSS_CERT:
3058: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3059: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3060: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3061: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3062: goto out;
1.64 markus 3063: if (strcmp(xmss_name, k->xmss_name)) {
3064: r = SSH_ERR_INVALID_FORMAT;
3065: goto out;
3066: }
1.62 markus 3067: if (pklen != sshkey_xmss_pklen(k) ||
3068: sklen != sshkey_xmss_sklen(k)) {
3069: r = SSH_ERR_INVALID_FORMAT;
3070: goto out;
3071: }
3072: k->xmss_pk = xmss_pk;
3073: k->xmss_sk = xmss_sk;
3074: xmss_pk = xmss_sk = NULL;
3075: /* optional internal state */
3076: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3077: goto out;
3078: break;
3079: #endif /* WITH_XMSS */
1.1 djm 3080: default:
3081: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3082: goto out;
3083: }
3084: #ifdef WITH_OPENSSL
3085: /* enable blinding */
3086: switch (k->type) {
3087: case KEY_RSA:
3088: case KEY_RSA_CERT:
3089: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3090: r = SSH_ERR_LIBCRYPTO_ERROR;
3091: goto out;
3092: }
3093: break;
3094: }
3095: #endif /* WITH_OPENSSL */
3096: /* success */
3097: r = 0;
3098: if (kp != NULL) {
3099: *kp = k;
3100: k = NULL;
3101: }
3102: out:
3103: free(tname);
3104: free(curve);
3105: #ifdef WITH_OPENSSL
1.60 jsing 3106: BN_clear_free(exponent);
1.69 djm 3107: BN_clear_free(dsa_p);
3108: BN_clear_free(dsa_q);
3109: BN_clear_free(dsa_g);
3110: BN_clear_free(dsa_pub_key);
3111: BN_clear_free(dsa_priv_key);
3112: BN_clear_free(rsa_n);
3113: BN_clear_free(rsa_e);
3114: BN_clear_free(rsa_d);
3115: BN_clear_free(rsa_p);
3116: BN_clear_free(rsa_q);
3117: BN_clear_free(rsa_iqmp);
1.1 djm 3118: #endif /* WITH_OPENSSL */
3119: sshkey_free(k);
1.61 jsing 3120: freezero(ed25519_pk, pklen);
3121: freezero(ed25519_sk, sklen);
1.62 markus 3122: free(xmss_name);
3123: freezero(xmss_pk, pklen);
3124: freezero(xmss_sk, sklen);
1.1 djm 3125: return r;
3126: }
3127:
3128: #ifdef WITH_OPENSSL
3129: int
3130: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3131: {
3132: BN_CTX *bnctx;
3133: EC_POINT *nq = NULL;
3134: BIGNUM *order, *x, *y, *tmp;
3135: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3136:
3137: /*
3138: * NB. This assumes OpenSSL has already verified that the public
3139: * point lies on the curve. This is done by EC_POINT_oct2point()
3140: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3141: * reachable with public points not unmarshalled using
3142: * EC_POINT_oct2point then the caller will need to explicitly check.
3143: */
1.1 djm 3144:
3145: if ((bnctx = BN_CTX_new()) == NULL)
3146: return SSH_ERR_ALLOC_FAIL;
3147: BN_CTX_start(bnctx);
3148:
3149: /*
3150: * We shouldn't ever hit this case because bignum_get_ecpoint()
3151: * refuses to load GF2m points.
3152: */
3153: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3154: NID_X9_62_prime_field)
3155: goto out;
3156:
3157: /* Q != infinity */
3158: if (EC_POINT_is_at_infinity(group, public))
3159: goto out;
3160:
3161: if ((x = BN_CTX_get(bnctx)) == NULL ||
3162: (y = BN_CTX_get(bnctx)) == NULL ||
3163: (order = BN_CTX_get(bnctx)) == NULL ||
3164: (tmp = BN_CTX_get(bnctx)) == NULL) {
3165: ret = SSH_ERR_ALLOC_FAIL;
3166: goto out;
3167: }
3168:
3169: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3170: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3171: EC_POINT_get_affine_coordinates_GFp(group, public,
3172: x, y, bnctx) != 1) {
3173: ret = SSH_ERR_LIBCRYPTO_ERROR;
3174: goto out;
3175: }
3176: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3177: BN_num_bits(y) <= BN_num_bits(order) / 2)
3178: goto out;
3179:
3180: /* nQ == infinity (n == order of subgroup) */
3181: if ((nq = EC_POINT_new(group)) == NULL) {
3182: ret = SSH_ERR_ALLOC_FAIL;
3183: goto out;
3184: }
3185: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3186: ret = SSH_ERR_LIBCRYPTO_ERROR;
3187: goto out;
3188: }
3189: if (EC_POINT_is_at_infinity(group, nq) != 1)
3190: goto out;
3191:
3192: /* x < order - 1, y < order - 1 */
3193: if (!BN_sub(tmp, order, BN_value_one())) {
3194: ret = SSH_ERR_LIBCRYPTO_ERROR;
3195: goto out;
3196: }
3197: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3198: goto out;
3199: ret = 0;
3200: out:
3201: BN_CTX_free(bnctx);
1.60 jsing 3202: EC_POINT_free(nq);
1.1 djm 3203: return ret;
3204: }
3205:
3206: int
3207: sshkey_ec_validate_private(const EC_KEY *key)
3208: {
3209: BN_CTX *bnctx;
3210: BIGNUM *order, *tmp;
3211: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3212:
3213: if ((bnctx = BN_CTX_new()) == NULL)
3214: return SSH_ERR_ALLOC_FAIL;
3215: BN_CTX_start(bnctx);
3216:
3217: if ((order = BN_CTX_get(bnctx)) == NULL ||
3218: (tmp = BN_CTX_get(bnctx)) == NULL) {
3219: ret = SSH_ERR_ALLOC_FAIL;
3220: goto out;
3221: }
3222:
3223: /* log2(private) > log2(order)/2 */
3224: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3225: ret = SSH_ERR_LIBCRYPTO_ERROR;
3226: goto out;
3227: }
3228: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3229: BN_num_bits(order) / 2)
3230: goto out;
3231:
3232: /* private < order - 1 */
3233: if (!BN_sub(tmp, order, BN_value_one())) {
3234: ret = SSH_ERR_LIBCRYPTO_ERROR;
3235: goto out;
3236: }
3237: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3238: goto out;
3239: ret = 0;
3240: out:
3241: BN_CTX_free(bnctx);
3242: return ret;
3243: }
3244:
3245: void
3246: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3247: {
3248: BIGNUM *x, *y;
3249: BN_CTX *bnctx;
3250:
3251: if (point == NULL) {
3252: fputs("point=(NULL)\n", stderr);
3253: return;
3254: }
3255: if ((bnctx = BN_CTX_new()) == NULL) {
3256: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3257: return;
3258: }
3259: BN_CTX_start(bnctx);
3260: if ((x = BN_CTX_get(bnctx)) == NULL ||
3261: (y = BN_CTX_get(bnctx)) == NULL) {
3262: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3263: return;
3264: }
3265: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3266: NID_X9_62_prime_field) {
3267: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3268: return;
3269: }
3270: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3271: bnctx) != 1) {
3272: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3273: __func__);
3274: return;
3275: }
3276: fputs("x=", stderr);
3277: BN_print_fp(stderr, x);
3278: fputs("\ny=", stderr);
3279: BN_print_fp(stderr, y);
3280: fputs("\n", stderr);
3281: BN_CTX_free(bnctx);
3282: }
3283:
3284: void
3285: sshkey_dump_ec_key(const EC_KEY *key)
3286: {
3287: const BIGNUM *exponent;
3288:
3289: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3290: EC_KEY_get0_public_key(key));
3291: fputs("exponent=", stderr);
3292: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3293: fputs("(NULL)", stderr);
3294: else
3295: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3296: fputs("\n", stderr);
3297: }
3298: #endif /* WITH_OPENSSL */
3299:
3300: static int
3301: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
3302: const char *passphrase, const char *comment, const char *ciphername,
3303: int rounds)
3304: {
1.4 djm 3305: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3306: u_char salt[SALT_LEN];
1.4 djm 3307: char *b64 = NULL;
1.1 djm 3308: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3309: u_int check;
3310: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3311: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3312: const struct sshcipher *cipher;
3313: const char *kdfname = KDFNAME;
3314: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3315:
3316: if (rounds <= 0)
3317: rounds = DEFAULT_ROUNDS;
3318: if (passphrase == NULL || !strlen(passphrase)) {
3319: ciphername = "none";
3320: kdfname = "none";
3321: } else if (ciphername == NULL)
3322: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3323: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3324: r = SSH_ERR_INVALID_ARGUMENT;
3325: goto out;
3326: }
3327:
3328: if ((kdf = sshbuf_new()) == NULL ||
3329: (encoded = sshbuf_new()) == NULL ||
3330: (encrypted = sshbuf_new()) == NULL) {
3331: r = SSH_ERR_ALLOC_FAIL;
3332: goto out;
3333: }
3334: blocksize = cipher_blocksize(cipher);
3335: keylen = cipher_keylen(cipher);
3336: ivlen = cipher_ivlen(cipher);
3337: authlen = cipher_authlen(cipher);
3338: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3339: r = SSH_ERR_ALLOC_FAIL;
3340: goto out;
3341: }
3342: if (strcmp(kdfname, "bcrypt") == 0) {
3343: arc4random_buf(salt, SALT_LEN);
3344: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3345: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3346: r = SSH_ERR_INVALID_ARGUMENT;
3347: goto out;
3348: }
3349: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3350: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3351: goto out;
3352: } else if (strcmp(kdfname, "none") != 0) {
3353: /* Unsupported KDF type */
3354: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3355: goto out;
3356: }
3357: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3358: key + keylen, ivlen, 1)) != 0)
3359: goto out;
3360:
3361: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3362: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3363: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3364: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3365: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3366: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3367: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3368: goto out;
3369:
3370: /* set up the buffer that will be encrypted */
3371:
3372: /* Random check bytes */
3373: check = arc4random();
3374: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3375: (r = sshbuf_put_u32(encrypted, check)) != 0)
3376: goto out;
3377:
3378: /* append private key and comment*/
1.62 markus 3379: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3380: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3381: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3382: goto out;
3383:
3384: /* padding */
3385: i = 0;
3386: while (sshbuf_len(encrypted) % blocksize) {
3387: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3388: goto out;
3389: }
3390:
3391: /* length in destination buffer */
3392: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3393: goto out;
3394:
3395: /* encrypt */
3396: if ((r = sshbuf_reserve(encoded,
3397: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3398: goto out;
1.36 djm 3399: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3400: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3401: goto out;
3402:
3403: /* uuencode */
3404: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3405: r = SSH_ERR_ALLOC_FAIL;
3406: goto out;
3407: }
3408:
3409: sshbuf_reset(blob);
3410: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3411: goto out;
3412: for (i = 0; i < strlen(b64); i++) {
3413: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3414: goto out;
3415: /* insert line breaks */
3416: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3417: goto out;
3418: }
3419: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3420: goto out;
3421: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3422: goto out;
3423:
3424: /* success */
3425: r = 0;
3426:
3427: out:
3428: sshbuf_free(kdf);
3429: sshbuf_free(encoded);
3430: sshbuf_free(encrypted);
1.36 djm 3431: cipher_free(ciphercontext);
1.1 djm 3432: explicit_bzero(salt, sizeof(salt));
3433: if (key != NULL) {
3434: explicit_bzero(key, keylen + ivlen);
3435: free(key);
3436: }
3437: if (pubkeyblob != NULL) {
3438: explicit_bzero(pubkeyblob, pubkeylen);
3439: free(pubkeyblob);
3440: }
3441: if (b64 != NULL) {
3442: explicit_bzero(b64, strlen(b64));
3443: free(b64);
3444: }
3445: return r;
3446: }
3447:
3448: static int
3449: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3450: struct sshkey **keyp, char **commentp)
3451: {
3452: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3453: const struct sshcipher *cipher = NULL;
3454: const u_char *cp;
3455: int r = SSH_ERR_INTERNAL_ERROR;
3456: size_t encoded_len;
1.18 djm 3457: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3458: struct sshbuf *encoded = NULL, *decoded = NULL;
3459: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3460: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3461: struct sshkey *k = NULL;
3462: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3463: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3464:
3465: if (keyp != NULL)
3466: *keyp = NULL;
3467: if (commentp != NULL)
3468: *commentp = NULL;
3469:
3470: if ((encoded = sshbuf_new()) == NULL ||
3471: (decoded = sshbuf_new()) == NULL ||
3472: (decrypted = sshbuf_new()) == NULL) {
3473: r = SSH_ERR_ALLOC_FAIL;
3474: goto out;
3475: }
3476:
3477: /* check preamble */
3478: cp = sshbuf_ptr(blob);
3479: encoded_len = sshbuf_len(blob);
3480: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3481: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3482: r = SSH_ERR_INVALID_FORMAT;
3483: goto out;
3484: }
3485: cp += MARK_BEGIN_LEN;
3486: encoded_len -= MARK_BEGIN_LEN;
3487:
3488: /* Look for end marker, removing whitespace as we go */
3489: while (encoded_len > 0) {
3490: if (*cp != '\n' && *cp != '\r') {
3491: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3492: goto out;
3493: }
3494: last = *cp;
3495: encoded_len--;
3496: cp++;
3497: if (last == '\n') {
3498: if (encoded_len >= MARK_END_LEN &&
3499: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3500: /* \0 terminate */
3501: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3502: goto out;
3503: break;
3504: }
3505: }
3506: }
3507: if (encoded_len == 0) {
3508: r = SSH_ERR_INVALID_FORMAT;
3509: goto out;
3510: }
3511:
3512: /* decode base64 */
1.4 djm 3513: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3514: goto out;
3515:
3516: /* check magic */
3517: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3518: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3519: r = SSH_ERR_INVALID_FORMAT;
3520: goto out;
3521: }
3522: /* parse public portion of key */
3523: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3524: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3525: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3526: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3527: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3528: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3529: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3530: goto out;
3531:
3532: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3533: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3534: goto out;
3535: }
3536: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3537: strcmp(ciphername, "none") != 0) {
3538: /* passphrase required */
3539: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3540: goto out;
3541: }
3542: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3543: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3544: goto out;
3545: }
3546: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3547: r = SSH_ERR_INVALID_FORMAT;
3548: goto out;
3549: }
3550: if (nkeys != 1) {
3551: /* XXX only one key supported */
3552: r = SSH_ERR_INVALID_FORMAT;
3553: goto out;
3554: }
3555:
3556: /* check size of encrypted key blob */
3557: blocksize = cipher_blocksize(cipher);
3558: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3559: r = SSH_ERR_INVALID_FORMAT;
3560: goto out;
3561: }
3562:
3563: /* setup key */
3564: keylen = cipher_keylen(cipher);
3565: ivlen = cipher_ivlen(cipher);
1.18 djm 3566: authlen = cipher_authlen(cipher);
1.1 djm 3567: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3568: r = SSH_ERR_ALLOC_FAIL;
3569: goto out;
3570: }
3571: if (strcmp(kdfname, "bcrypt") == 0) {
3572: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3573: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3574: goto out;
3575: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3576: key, keylen + ivlen, rounds) < 0) {
3577: r = SSH_ERR_INVALID_FORMAT;
3578: goto out;
3579: }
3580: }
3581:
1.18 djm 3582: /* check that an appropriate amount of auth data is present */
3583: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3584: r = SSH_ERR_INVALID_FORMAT;
3585: goto out;
3586: }
3587:
1.1 djm 3588: /* decrypt private portion of key */
3589: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3590: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3591: key + keylen, ivlen, 0)) != 0)
3592: goto out;
1.36 djm 3593: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3594: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3595: /* an integrity error here indicates an incorrect passphrase */
3596: if (r == SSH_ERR_MAC_INVALID)
3597: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3598: goto out;
3599: }
1.18 djm 3600: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3601: goto out;
3602: /* there should be no trailing data */
3603: if (sshbuf_len(decoded) != 0) {
3604: r = SSH_ERR_INVALID_FORMAT;
3605: goto out;
3606: }
3607:
3608: /* check check bytes */
3609: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3610: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3611: goto out;
3612: if (check1 != check2) {
3613: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3614: goto out;
3615: }
3616:
3617: /* Load the private key and comment */
3618: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3619: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3620: goto out;
3621:
3622: /* Check deterministic padding */
3623: i = 0;
3624: while (sshbuf_len(decrypted)) {
3625: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3626: goto out;
3627: if (pad != (++i & 0xff)) {
3628: r = SSH_ERR_INVALID_FORMAT;
3629: goto out;
3630: }
3631: }
3632:
3633: /* XXX decode pubkey and check against private */
3634:
3635: /* success */
3636: r = 0;
3637: if (keyp != NULL) {
3638: *keyp = k;
3639: k = NULL;
3640: }
3641: if (commentp != NULL) {
3642: *commentp = comment;
3643: comment = NULL;
3644: }
3645: out:
3646: pad = 0;
1.36 djm 3647: cipher_free(ciphercontext);
1.1 djm 3648: free(ciphername);
3649: free(kdfname);
3650: free(comment);
3651: if (salt != NULL) {
3652: explicit_bzero(salt, slen);
3653: free(salt);
3654: }
3655: if (key != NULL) {
3656: explicit_bzero(key, keylen + ivlen);
3657: free(key);
3658: }
3659: sshbuf_free(encoded);
3660: sshbuf_free(decoded);
3661: sshbuf_free(kdf);
3662: sshbuf_free(decrypted);
3663: sshkey_free(k);
3664: return r;
3665: }
3666:
3667:
3668: #ifdef WITH_OPENSSL
3669: /* convert SSH v2 key in OpenSSL PEM format */
3670: static int
3671: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3672: const char *_passphrase, const char *comment)
3673: {
3674: int success, r;
3675: int blen, len = strlen(_passphrase);
3676: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3677: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3678: char *bptr;
1.1 djm 3679: BIO *bio = NULL;
3680:
3681: if (len > 0 && len <= 4)
3682: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3683: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3684: return SSH_ERR_ALLOC_FAIL;
3685:
3686: switch (key->type) {
3687: case KEY_DSA:
3688: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3689: cipher, passphrase, len, NULL, NULL);
3690: break;
3691: case KEY_ECDSA:
3692: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3693: cipher, passphrase, len, NULL, NULL);
3694: break;
3695: case KEY_RSA:
3696: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3697: cipher, passphrase, len, NULL, NULL);
3698: break;
3699: default:
3700: success = 0;
3701: break;
3702: }
3703: if (success == 0) {
3704: r = SSH_ERR_LIBCRYPTO_ERROR;
3705: goto out;
3706: }
3707: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3708: r = SSH_ERR_INTERNAL_ERROR;
3709: goto out;
3710: }
3711: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3712: goto out;
3713: r = 0;
3714: out:
3715: BIO_free(bio);
3716: return r;
3717: }
3718: #endif /* WITH_OPENSSL */
3719:
3720: /* Serialise "key" to buffer "blob" */
3721: int
3722: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3723: const char *passphrase, const char *comment,
3724: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3725: {
3726: switch (key->type) {
1.9 markus 3727: #ifdef WITH_OPENSSL
1.1 djm 3728: case KEY_DSA:
3729: case KEY_ECDSA:
3730: case KEY_RSA:
3731: if (force_new_format) {
3732: return sshkey_private_to_blob2(key, blob, passphrase,
3733: comment, new_format_cipher, new_format_rounds);
3734: }
3735: return sshkey_private_pem_to_blob(key, blob,
3736: passphrase, comment);
3737: #endif /* WITH_OPENSSL */
3738: case KEY_ED25519:
1.62 markus 3739: #ifdef WITH_XMSS
3740: case KEY_XMSS:
3741: #endif /* WITH_XMSS */
1.1 djm 3742: return sshkey_private_to_blob2(key, blob, passphrase,
3743: comment, new_format_cipher, new_format_rounds);
3744: default:
3745: return SSH_ERR_KEY_TYPE_UNKNOWN;
3746: }
3747: }
3748:
3749:
3750: #ifdef WITH_OPENSSL
1.8 djm 3751: static int
1.52 djm 3752: translate_libcrypto_error(unsigned long pem_err)
3753: {
3754: int pem_reason = ERR_GET_REASON(pem_err);
3755:
3756: switch (ERR_GET_LIB(pem_err)) {
3757: case ERR_LIB_PEM:
3758: switch (pem_reason) {
3759: case PEM_R_BAD_PASSWORD_READ:
3760: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3761: case PEM_R_BAD_DECRYPT:
3762: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3763: default:
3764: return SSH_ERR_INVALID_FORMAT;
3765: }
3766: case ERR_LIB_EVP:
3767: switch (pem_reason) {
3768: case EVP_R_BAD_DECRYPT:
3769: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3770: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3771: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3772: #endif
1.52 djm 3773: case EVP_R_DECODE_ERROR:
3774: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3775: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3776: #endif
3777: return SSH_ERR_INVALID_FORMAT;
3778: default:
3779: return SSH_ERR_LIBCRYPTO_ERROR;
3780: }
3781: case ERR_LIB_ASN1:
3782: return SSH_ERR_INVALID_FORMAT;
3783: }
3784: return SSH_ERR_LIBCRYPTO_ERROR;
3785: }
3786:
3787: static void
3788: clear_libcrypto_errors(void)
3789: {
3790: while (ERR_get_error() != 0)
3791: ;
3792: }
3793:
3794: /*
3795: * Translate OpenSSL error codes to determine whether
3796: * passphrase is required/incorrect.
3797: */
3798: static int
3799: convert_libcrypto_error(void)
3800: {
3801: /*
3802: * Some password errors are reported at the beginning
3803: * of the error queue.
3804: */
3805: if (translate_libcrypto_error(ERR_peek_error()) ==
3806: SSH_ERR_KEY_WRONG_PASSPHRASE)
3807: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3808: return translate_libcrypto_error(ERR_peek_last_error());
3809: }
3810:
3811: static int
1.1 djm 3812: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3813: const char *passphrase, struct sshkey **keyp)
1.1 djm 3814: {
3815: EVP_PKEY *pk = NULL;
3816: struct sshkey *prv = NULL;
3817: BIO *bio = NULL;
3818: int r;
3819:
1.32 djm 3820: if (keyp != NULL)
3821: *keyp = NULL;
1.1 djm 3822:
3823: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3824: return SSH_ERR_ALLOC_FAIL;
3825: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3826: (int)sshbuf_len(blob)) {
3827: r = SSH_ERR_ALLOC_FAIL;
3828: goto out;
3829: }
3830:
1.52 djm 3831: clear_libcrypto_errors();
1.1 djm 3832: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3833: (char *)passphrase)) == NULL) {
1.71 djm 3834: /*
3835: * libcrypto may return various ASN.1 errors when attempting
3836: * to parse a key with an incorrect passphrase.
3837: * Treat all format errors as "incorrect passphrase" if a
3838: * passphrase was supplied.
3839: */
3840: if (passphrase != NULL && *passphrase != '\0')
3841: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3842: else
3843: r = convert_libcrypto_error();
1.1 djm 3844: goto out;
3845: }
1.69 djm 3846: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3847: (type == KEY_UNSPEC || type == KEY_RSA)) {
3848: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3849: r = SSH_ERR_ALLOC_FAIL;
3850: goto out;
3851: }
3852: prv->rsa = EVP_PKEY_get1_RSA(pk);
3853: prv->type = KEY_RSA;
3854: #ifdef DEBUG_PK
3855: RSA_print_fp(stderr, prv->rsa, 8);
3856: #endif
3857: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3858: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3859: goto out;
3860: }
1.69 djm 3861: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 3862: goto out;
1.69 djm 3863: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3864: (type == KEY_UNSPEC || type == KEY_DSA)) {
3865: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3866: r = SSH_ERR_ALLOC_FAIL;
3867: goto out;
3868: }
3869: prv->dsa = EVP_PKEY_get1_DSA(pk);
3870: prv->type = KEY_DSA;
3871: #ifdef DEBUG_PK
3872: DSA_print_fp(stderr, prv->dsa, 8);
3873: #endif
1.69 djm 3874: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3875: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3876: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3877: r = SSH_ERR_ALLOC_FAIL;
3878: goto out;
3879: }
3880: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3881: prv->type = KEY_ECDSA;
3882: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3883: if (prv->ecdsa_nid == -1 ||
3884: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3885: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3886: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3887: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3888: r = SSH_ERR_INVALID_FORMAT;
3889: goto out;
3890: }
3891: #ifdef DEBUG_PK
3892: if (prv != NULL && prv->ecdsa != NULL)
3893: sshkey_dump_ec_key(prv->ecdsa);
3894: #endif
3895: } else {
3896: r = SSH_ERR_INVALID_FORMAT;
3897: goto out;
3898: }
3899: r = 0;
1.32 djm 3900: if (keyp != NULL) {
3901: *keyp = prv;
3902: prv = NULL;
3903: }
1.1 djm 3904: out:
3905: BIO_free(bio);
1.60 jsing 3906: EVP_PKEY_free(pk);
1.30 mmcc 3907: sshkey_free(prv);
1.1 djm 3908: return r;
3909: }
3910: #endif /* WITH_OPENSSL */
3911:
3912: int
3913: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3914: const char *passphrase, struct sshkey **keyp, char **commentp)
3915: {
1.42 djm 3916: int r = SSH_ERR_INTERNAL_ERROR;
3917:
1.32 djm 3918: if (keyp != NULL)
3919: *keyp = NULL;
1.1 djm 3920: if (commentp != NULL)
3921: *commentp = NULL;
3922:
3923: switch (type) {
1.9 markus 3924: #ifdef WITH_OPENSSL
1.1 djm 3925: case KEY_DSA:
3926: case KEY_ECDSA:
3927: case KEY_RSA:
1.8 djm 3928: return sshkey_parse_private_pem_fileblob(blob, type,
3929: passphrase, keyp);
1.1 djm 3930: #endif /* WITH_OPENSSL */
3931: case KEY_ED25519:
1.62 markus 3932: #ifdef WITH_XMSS
3933: case KEY_XMSS:
3934: #endif /* WITH_XMSS */
1.1 djm 3935: return sshkey_parse_private2(blob, type, passphrase,
3936: keyp, commentp);
3937: case KEY_UNSPEC:
1.42 djm 3938: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3939: commentp);
3940: /* Do not fallback to PEM parser if only passphrase is wrong. */
3941: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
3942: return r;
1.1 djm 3943: #ifdef WITH_OPENSSL
1.8 djm 3944: return sshkey_parse_private_pem_fileblob(blob, type,
3945: passphrase, keyp);
1.1 djm 3946: #else
3947: return SSH_ERR_INVALID_FORMAT;
3948: #endif /* WITH_OPENSSL */
3949: default:
3950: return SSH_ERR_KEY_TYPE_UNKNOWN;
3951: }
3952: }
3953:
3954: int
3955: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3956: struct sshkey **keyp, char **commentp)
1.1 djm 3957: {
3958: if (keyp != NULL)
3959: *keyp = NULL;
3960: if (commentp != NULL)
3961: *commentp = NULL;
3962:
1.23 tim 3963: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3964: passphrase, keyp, commentp);
1.1 djm 3965: }
1.62 markus 3966:
3967: #ifdef WITH_XMSS
3968: /*
3969: * serialize the key with the current state and forward the state
3970: * maxsign times.
3971: */
3972: int
3973: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
3974: u_int32_t maxsign, sshkey_printfn *pr)
3975: {
3976: int r, rupdate;
3977:
3978: if (maxsign == 0 ||
3979: sshkey_type_plain(k->type) != KEY_XMSS)
3980: return sshkey_private_serialize_opt(k, b,
3981: SSHKEY_SERIALIZE_DEFAULT);
3982: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
3983: (r = sshkey_private_serialize_opt(k, b,
3984: SSHKEY_SERIALIZE_STATE)) != 0 ||
3985: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3986: goto out;
3987: r = 0;
3988: out:
3989: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
3990: if (r == 0)
3991: r = rupdate;
3992: }
3993: return r;
3994: }
3995:
3996: u_int32_t
3997: sshkey_signatures_left(const struct sshkey *k)
3998: {
3999: if (sshkey_type_plain(k->type) == KEY_XMSS)
4000: return sshkey_xmss_signatures_left(k);
4001: return 0;
4002: }
4003:
4004: int
4005: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4006: {
4007: if (sshkey_type_plain(k->type) != KEY_XMSS)
4008: return SSH_ERR_INVALID_ARGUMENT;
4009: return sshkey_xmss_enable_maxsign(k, maxsign);
4010: }
4011:
4012: int
4013: sshkey_set_filename(struct sshkey *k, const char *filename)
4014: {
4015: if (k == NULL)
4016: return SSH_ERR_INVALID_ARGUMENT;
4017: if (sshkey_type_plain(k->type) != KEY_XMSS)
4018: return 0;
4019: if (filename == NULL)
4020: return SSH_ERR_INVALID_ARGUMENT;
4021: if ((k->xmss_filename = strdup(filename)) == NULL)
4022: return SSH_ERR_ALLOC_FAIL;
4023: return 0;
4024: }
4025: #else
4026: int
4027: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4028: u_int32_t maxsign, sshkey_printfn *pr)
4029: {
4030: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4031: }
4032:
4033: u_int32_t
4034: sshkey_signatures_left(const struct sshkey *k)
4035: {
4036: return 0;
4037: }
4038:
4039: int
4040: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4041: {
4042: return SSH_ERR_INVALID_ARGUMENT;
4043: }
4044:
4045: int
4046: sshkey_set_filename(struct sshkey *k, const char *filename)
4047: {
4048: if (k == NULL)
4049: return SSH_ERR_INVALID_ARGUMENT;
4050: return 0;
4051: }
4052: #endif /* WITH_XMSS */
![[BACK]](/icons/back.gif){kind=icon}
Return to sshkey.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh