Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.74
1.74 ! dtucker 1: /* $OpenBSD: sshkey.c,v 1.73 2019/01/21 09:54:11 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4: * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5: * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/types.h>
1.7 djm 29: #include <netinet/in.h>
1.1 djm 30:
1.12 djm 31: #ifdef WITH_OPENSSL
1.1 djm 32: #include <openssl/evp.h>
33: #include <openssl/err.h>
34: #include <openssl/pem.h>
1.12 djm 35: #endif
1.1 djm 36:
37: #include "crypto_api.h"
38:
39: #include <errno.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <util.h>
1.13 deraadt 43: #include <limits.h>
1.7 djm 44: #include <resolv.h>
1.1 djm 45:
46: #include "ssh2.h"
47: #include "ssherr.h"
48: #include "misc.h"
49: #include "sshbuf.h"
50: #include "cipher.h"
51: #include "digest.h"
52: #define SSHKEY_INTERNAL
53: #include "sshkey.h"
1.11 djm 54: #include "match.h"
1.1 djm 55:
1.74 ! dtucker 56: #ifdef WITH_XMSS
! 57: #include "sshkey-xmss.h"
1.62 markus 58: #include "xmss_fast.h"
1.74 ! dtucker 59: #endif
1.62 markus 60:
1.1 djm 61: /* openssh private key file format */
62: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
63: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
64: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
65: #define MARK_END_LEN (sizeof(MARK_END) - 1)
66: #define KDFNAME "bcrypt"
67: #define AUTH_MAGIC "openssh-key-v1"
68: #define SALT_LEN 16
1.56 djm 69: #define DEFAULT_CIPHERNAME "aes256-ctr"
1.1 djm 70: #define DEFAULT_ROUNDS 16
71:
72: /* Version identification string for SSH v1 identity files. */
73: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
74:
1.62 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;
2476:
1.1 djm 2477: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2478: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2479:
2480: cert = k->cert->certblob; /* for readability */
2481: sshbuf_reset(cert);
2482: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2483: goto out;
2484:
2485: /* -v01 certs put nonce first */
2486: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2487: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2488: goto out;
1.1 djm 2489:
2490: /* XXX this substantially duplicates to_blob(); refactor */
2491: switch (k->type) {
2492: #ifdef WITH_OPENSSL
2493: case KEY_DSA_CERT:
1.69 djm 2494: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2495: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2496: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2497: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2498: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2499: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2500: goto out;
2501: break;
2502: case KEY_ECDSA_CERT:
2503: if ((ret = sshbuf_put_cstring(cert,
2504: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2505: (ret = sshbuf_put_ec(cert,
2506: EC_KEY_get0_public_key(k->ecdsa),
2507: EC_KEY_get0_group(k->ecdsa))) != 0)
2508: goto out;
2509: break;
2510: case KEY_RSA_CERT:
1.69 djm 2511: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2512: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2513: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2514: goto out;
2515: break;
2516: #endif /* WITH_OPENSSL */
2517: case KEY_ED25519_CERT:
2518: if ((ret = sshbuf_put_string(cert,
2519: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2520: goto out;
2521: break;
1.62 markus 2522: #ifdef WITH_XMSS
2523: case KEY_XMSS_CERT:
2524: if (k->xmss_name == NULL) {
2525: ret = SSH_ERR_INVALID_ARGUMENT;
2526: goto out;
2527: }
2528: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2529: (ret = sshbuf_put_string(cert,
2530: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2531: goto out;
2532: break;
2533: #endif /* WITH_XMSS */
1.1 djm 2534: default:
2535: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2536: goto out;
1.1 djm 2537: }
2538:
1.20 djm 2539: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2540: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2541: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2542: goto out;
2543:
2544: if ((principals = sshbuf_new()) == NULL) {
2545: ret = SSH_ERR_ALLOC_FAIL;
2546: goto out;
2547: }
2548: for (i = 0; i < k->cert->nprincipals; i++) {
2549: if ((ret = sshbuf_put_cstring(principals,
2550: k->cert->principals[i])) != 0)
2551: goto out;
2552: }
2553: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2554: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2555: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2556: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2557: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2558: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2559: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2560: goto out;
2561:
2562: /* Sign the whole mess */
1.53 djm 2563: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2564: sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
1.1 djm 2565: goto out;
1.67 djm 2566: /* Check and update signature_type against what was actually used */
2567: if ((ret = get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
2568: goto out;
2569: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2570: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2571: goto out;
2572: }
2573: if (k->cert->signature_type == NULL) {
2574: k->cert->signature_type = sigtype;
2575: sigtype = NULL;
2576: }
1.1 djm 2577: /* Append signature and we are done */
2578: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2579: goto out;
2580: ret = 0;
2581: out:
2582: if (ret != 0)
2583: sshbuf_reset(cert);
1.29 mmcc 2584: free(sig_blob);
2585: free(ca_blob);
1.67 djm 2586: free(sigtype);
1.31 mmcc 2587: sshbuf_free(principals);
1.1 djm 2588: return ret;
1.53 djm 2589: }
2590:
2591: static int
2592: default_key_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
2593: const u_char *data, size_t datalen,
2594: const char *alg, u_int compat, void *ctx)
2595: {
2596: if (ctx != NULL)
2597: return SSH_ERR_INVALID_ARGUMENT;
2598: return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2599: }
2600:
2601: int
2602: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2603: {
2604: return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
1.1 djm 2605: }
2606:
2607: int
2608: sshkey_cert_check_authority(const struct sshkey *k,
2609: int want_host, int require_principal,
2610: const char *name, const char **reason)
2611: {
2612: u_int i, principal_matches;
2613: time_t now = time(NULL);
2614:
2615: if (reason != NULL)
2616: *reason = NULL;
2617:
2618: if (want_host) {
2619: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2620: *reason = "Certificate invalid: not a host certificate";
2621: return SSH_ERR_KEY_CERT_INVALID;
2622: }
2623: } else {
2624: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2625: *reason = "Certificate invalid: not a user certificate";
2626: return SSH_ERR_KEY_CERT_INVALID;
2627: }
2628: }
2629: if (now < 0) {
2630: /* yikes - system clock before epoch! */
2631: *reason = "Certificate invalid: not yet valid";
2632: return SSH_ERR_KEY_CERT_INVALID;
2633: }
2634: if ((u_int64_t)now < k->cert->valid_after) {
2635: *reason = "Certificate invalid: not yet valid";
2636: return SSH_ERR_KEY_CERT_INVALID;
2637: }
2638: if ((u_int64_t)now >= k->cert->valid_before) {
2639: *reason = "Certificate invalid: expired";
2640: return SSH_ERR_KEY_CERT_INVALID;
2641: }
2642: if (k->cert->nprincipals == 0) {
2643: if (require_principal) {
2644: *reason = "Certificate lacks principal list";
2645: return SSH_ERR_KEY_CERT_INVALID;
2646: }
2647: } else if (name != NULL) {
2648: principal_matches = 0;
2649: for (i = 0; i < k->cert->nprincipals; i++) {
2650: if (strcmp(name, k->cert->principals[i]) == 0) {
2651: principal_matches = 1;
2652: break;
2653: }
2654: }
2655: if (!principal_matches) {
2656: *reason = "Certificate invalid: name is not a listed "
2657: "principal";
2658: return SSH_ERR_KEY_CERT_INVALID;
2659: }
2660: }
2661: return 0;
1.27 djm 2662: }
2663:
2664: size_t
2665: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2666: {
2667: char from[32], to[32], ret[64];
2668: time_t tt;
2669: struct tm *tm;
2670:
2671: *from = *to = '\0';
2672: if (cert->valid_after == 0 &&
2673: cert->valid_before == 0xffffffffffffffffULL)
2674: return strlcpy(s, "forever", l);
2675:
2676: if (cert->valid_after != 0) {
2677: /* XXX revisit INT_MAX in 2038 :) */
2678: tt = cert->valid_after > INT_MAX ?
2679: INT_MAX : cert->valid_after;
2680: tm = localtime(&tt);
2681: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2682: }
2683: if (cert->valid_before != 0xffffffffffffffffULL) {
2684: /* XXX revisit INT_MAX in 2038 :) */
2685: tt = cert->valid_before > INT_MAX ?
2686: INT_MAX : cert->valid_before;
2687: tm = localtime(&tt);
2688: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2689: }
2690:
2691: if (cert->valid_after == 0)
2692: snprintf(ret, sizeof(ret), "before %s", to);
2693: else if (cert->valid_before == 0xffffffffffffffffULL)
2694: snprintf(ret, sizeof(ret), "after %s", from);
2695: else
2696: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2697:
2698: return strlcpy(s, ret, l);
1.1 djm 2699: }
2700:
2701: int
1.62 markus 2702: sshkey_private_serialize_opt(const struct sshkey *key, struct sshbuf *b,
2703: enum sshkey_serialize_rep opts)
1.1 djm 2704: {
2705: int r = SSH_ERR_INTERNAL_ERROR;
1.69 djm 2706: #ifdef WITH_OPENSSL
2707: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2708: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2709: #endif /* WITH_OPENSSL */
1.1 djm 2710:
2711: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2712: goto out;
2713: switch (key->type) {
2714: #ifdef WITH_OPENSSL
2715: case KEY_RSA:
1.69 djm 2716: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2717: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2718: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2719: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2720: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2721: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2722: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2723: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2724: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2725: goto out;
2726: break;
2727: case KEY_RSA_CERT:
2728: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2729: r = SSH_ERR_INVALID_ARGUMENT;
2730: goto out;
2731: }
1.69 djm 2732: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2733: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2734: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2735: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2736: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2737: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2738: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2739: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2740: goto out;
2741: break;
2742: case KEY_DSA:
1.69 djm 2743: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2744: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2745: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2746: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2747: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2748: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2749: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2750: goto out;
2751: break;
2752: case KEY_DSA_CERT:
2753: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2754: r = SSH_ERR_INVALID_ARGUMENT;
2755: goto out;
2756: }
1.69 djm 2757: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2758: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2759: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2760: goto out;
2761: break;
2762: case KEY_ECDSA:
2763: if ((r = sshbuf_put_cstring(b,
2764: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2765: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2766: (r = sshbuf_put_bignum2(b,
2767: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2768: goto out;
2769: break;
2770: case KEY_ECDSA_CERT:
2771: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2772: r = SSH_ERR_INVALID_ARGUMENT;
2773: goto out;
2774: }
2775: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2776: (r = sshbuf_put_bignum2(b,
2777: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2778: goto out;
2779: break;
2780: #endif /* WITH_OPENSSL */
2781: case KEY_ED25519:
2782: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2783: ED25519_PK_SZ)) != 0 ||
2784: (r = sshbuf_put_string(b, key->ed25519_sk,
2785: ED25519_SK_SZ)) != 0)
2786: goto out;
2787: break;
2788: case KEY_ED25519_CERT:
2789: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2790: r = SSH_ERR_INVALID_ARGUMENT;
2791: goto out;
2792: }
2793: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2794: (r = sshbuf_put_string(b, key->ed25519_pk,
2795: ED25519_PK_SZ)) != 0 ||
2796: (r = sshbuf_put_string(b, key->ed25519_sk,
2797: ED25519_SK_SZ)) != 0)
2798: goto out;
2799: break;
1.62 markus 2800: #ifdef WITH_XMSS
2801: case KEY_XMSS:
2802: if (key->xmss_name == NULL) {
2803: r = SSH_ERR_INVALID_ARGUMENT;
2804: goto out;
2805: }
2806: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2807: (r = sshbuf_put_string(b, key->xmss_pk,
2808: sshkey_xmss_pklen(key))) != 0 ||
2809: (r = sshbuf_put_string(b, key->xmss_sk,
2810: sshkey_xmss_sklen(key))) != 0 ||
2811: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2812: goto out;
2813: break;
2814: case KEY_XMSS_CERT:
2815: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2816: key->xmss_name == NULL) {
2817: r = SSH_ERR_INVALID_ARGUMENT;
2818: goto out;
2819: }
2820: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2821: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2822: (r = sshbuf_put_string(b, key->xmss_pk,
2823: sshkey_xmss_pklen(key))) != 0 ||
2824: (r = sshbuf_put_string(b, key->xmss_sk,
2825: sshkey_xmss_sklen(key))) != 0 ||
2826: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2827: goto out;
2828: break;
2829: #endif /* WITH_XMSS */
1.1 djm 2830: default:
2831: r = SSH_ERR_INVALID_ARGUMENT;
2832: goto out;
2833: }
2834: /* success */
2835: r = 0;
2836: out:
2837: return r;
2838: }
2839:
2840: int
1.62 markus 2841: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2842: {
2843: return sshkey_private_serialize_opt(key, b,
2844: SSHKEY_SERIALIZE_DEFAULT);
2845: }
2846:
2847: int
1.1 djm 2848: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2849: {
1.62 markus 2850: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2851: struct sshkey *k = NULL;
1.14 djm 2852: size_t pklen = 0, sklen = 0;
1.1 djm 2853: int type, r = SSH_ERR_INTERNAL_ERROR;
2854: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 2855: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2856: #ifdef WITH_OPENSSL
2857: BIGNUM *exponent = NULL;
1.69 djm 2858: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2859: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2860: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2861: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2862: #endif /* WITH_OPENSSL */
2863:
2864: if (kp != NULL)
2865: *kp = NULL;
2866: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2867: goto out;
2868: type = sshkey_type_from_name(tname);
2869: switch (type) {
2870: #ifdef WITH_OPENSSL
2871: case KEY_DSA:
1.70 djm 2872: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2873: r = SSH_ERR_ALLOC_FAIL;
2874: goto out;
2875: }
1.73 djm 2876: if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 ||
2877: (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 ||
2878: (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 ||
2879: (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 ||
2880: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.69 djm 2881: goto out;
2882: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2883: r = SSH_ERR_LIBCRYPTO_ERROR;
2884: goto out;
2885: }
2886: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2887: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
2888: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2889: goto out;
1.69 djm 2890: }
2891: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 2892: break;
2893: case KEY_DSA_CERT:
1.14 djm 2894: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 2895: (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0)
1.1 djm 2896: goto out;
1.69 djm 2897: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2898: r = SSH_ERR_LIBCRYPTO_ERROR;
2899: goto out;
2900: }
2901: dsa_priv_key = NULL; /* transferred */
1.1 djm 2902: break;
2903: case KEY_ECDSA:
1.70 djm 2904: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2905: r = SSH_ERR_ALLOC_FAIL;
2906: goto out;
2907: }
2908: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2909: r = SSH_ERR_INVALID_ARGUMENT;
2910: goto out;
2911: }
2912: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2913: goto out;
2914: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2915: r = SSH_ERR_EC_CURVE_MISMATCH;
2916: goto out;
2917: }
2918: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1.73 djm 2919: if (k->ecdsa == NULL) {
1.1 djm 2920: r = SSH_ERR_LIBCRYPTO_ERROR;
2921: goto out;
2922: }
2923: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
1.73 djm 2924: (r = sshbuf_get_bignum2(buf, &exponent)))
1.1 djm 2925: goto out;
2926: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2927: r = SSH_ERR_LIBCRYPTO_ERROR;
2928: goto out;
2929: }
2930: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2931: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2932: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2933: goto out;
2934: break;
2935: case KEY_ECDSA_CERT:
1.14 djm 2936: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 2937: (r = sshbuf_get_bignum2(buf, &exponent)) != 0)
1.1 djm 2938: goto out;
2939: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2940: r = SSH_ERR_LIBCRYPTO_ERROR;
2941: goto out;
2942: }
2943: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2944: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2945: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2946: goto out;
2947: break;
2948: case KEY_RSA:
1.70 djm 2949: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2950: r = SSH_ERR_ALLOC_FAIL;
2951: goto out;
2952: }
1.73 djm 2953: if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 ||
2954: (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 ||
2955: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
2956: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
2957: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
2958: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 2959: goto out;
1.69 djm 2960: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
2961: r = SSH_ERR_LIBCRYPTO_ERROR;
2962: goto out;
2963: }
2964: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
2965: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
2966: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2967: goto out;
2968: }
1.69 djm 2969: rsa_p = rsa_q = NULL; /* transferred */
2970: if ((r = check_rsa_length(k->rsa)) != 0)
2971: goto out;
2972: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
2973: goto out;
1.1 djm 2974: break;
2975: case KEY_RSA_CERT:
1.14 djm 2976: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.73 djm 2977: (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 ||
2978: (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 ||
2979: (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 ||
2980: (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0)
1.1 djm 2981: goto out;
1.69 djm 2982: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
2983: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2984: goto out;
2985: }
1.69 djm 2986: rsa_d = NULL; /* transferred */
2987: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
2988: r = SSH_ERR_LIBCRYPTO_ERROR;
2989: goto out;
2990: }
2991: rsa_p = rsa_q = NULL; /* transferred */
2992: if ((r = check_rsa_length(k->rsa)) != 0)
2993: goto out;
2994: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
2995: goto out;
1.1 djm 2996: break;
2997: #endif /* WITH_OPENSSL */
2998: case KEY_ED25519:
1.70 djm 2999: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3000: r = SSH_ERR_ALLOC_FAIL;
3001: goto out;
3002: }
3003: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3004: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3005: goto out;
3006: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3007: r = SSH_ERR_INVALID_FORMAT;
3008: goto out;
3009: }
3010: k->ed25519_pk = ed25519_pk;
3011: k->ed25519_sk = ed25519_sk;
3012: ed25519_pk = ed25519_sk = NULL;
3013: break;
3014: case KEY_ED25519_CERT:
1.14 djm 3015: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3016: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3017: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3018: goto out;
3019: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3020: r = SSH_ERR_INVALID_FORMAT;
3021: goto out;
3022: }
3023: k->ed25519_pk = ed25519_pk;
3024: k->ed25519_sk = ed25519_sk;
3025: ed25519_pk = ed25519_sk = NULL;
3026: break;
1.62 markus 3027: #ifdef WITH_XMSS
3028: case KEY_XMSS:
1.70 djm 3029: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3030: r = SSH_ERR_ALLOC_FAIL;
3031: goto out;
3032: }
3033: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3034: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3035: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3036: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3037: goto out;
3038: if (pklen != sshkey_xmss_pklen(k) ||
3039: sklen != sshkey_xmss_sklen(k)) {
3040: r = SSH_ERR_INVALID_FORMAT;
3041: goto out;
3042: }
3043: k->xmss_pk = xmss_pk;
3044: k->xmss_sk = xmss_sk;
3045: xmss_pk = xmss_sk = NULL;
3046: /* optional internal state */
3047: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3048: goto out;
3049: break;
3050: case KEY_XMSS_CERT:
3051: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3052: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3053: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3054: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3055: goto out;
1.64 markus 3056: if (strcmp(xmss_name, k->xmss_name)) {
3057: r = SSH_ERR_INVALID_FORMAT;
3058: goto out;
3059: }
1.62 markus 3060: if (pklen != sshkey_xmss_pklen(k) ||
3061: sklen != sshkey_xmss_sklen(k)) {
3062: r = SSH_ERR_INVALID_FORMAT;
3063: goto out;
3064: }
3065: k->xmss_pk = xmss_pk;
3066: k->xmss_sk = xmss_sk;
3067: xmss_pk = xmss_sk = NULL;
3068: /* optional internal state */
3069: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3070: goto out;
3071: break;
3072: #endif /* WITH_XMSS */
1.1 djm 3073: default:
3074: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3075: goto out;
3076: }
3077: #ifdef WITH_OPENSSL
3078: /* enable blinding */
3079: switch (k->type) {
3080: case KEY_RSA:
3081: case KEY_RSA_CERT:
3082: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3083: r = SSH_ERR_LIBCRYPTO_ERROR;
3084: goto out;
3085: }
3086: break;
3087: }
3088: #endif /* WITH_OPENSSL */
3089: /* success */
3090: r = 0;
3091: if (kp != NULL) {
3092: *kp = k;
3093: k = NULL;
3094: }
3095: out:
3096: free(tname);
3097: free(curve);
3098: #ifdef WITH_OPENSSL
1.60 jsing 3099: BN_clear_free(exponent);
1.69 djm 3100: BN_clear_free(dsa_p);
3101: BN_clear_free(dsa_q);
3102: BN_clear_free(dsa_g);
3103: BN_clear_free(dsa_pub_key);
3104: BN_clear_free(dsa_priv_key);
3105: BN_clear_free(rsa_n);
3106: BN_clear_free(rsa_e);
3107: BN_clear_free(rsa_d);
3108: BN_clear_free(rsa_p);
3109: BN_clear_free(rsa_q);
3110: BN_clear_free(rsa_iqmp);
1.1 djm 3111: #endif /* WITH_OPENSSL */
3112: sshkey_free(k);
1.61 jsing 3113: freezero(ed25519_pk, pklen);
3114: freezero(ed25519_sk, sklen);
1.62 markus 3115: free(xmss_name);
3116: freezero(xmss_pk, pklen);
3117: freezero(xmss_sk, sklen);
1.1 djm 3118: return r;
3119: }
3120:
3121: #ifdef WITH_OPENSSL
3122: int
3123: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3124: {
3125: BN_CTX *bnctx;
3126: EC_POINT *nq = NULL;
3127: BIGNUM *order, *x, *y, *tmp;
3128: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3129:
3130: /*
3131: * NB. This assumes OpenSSL has already verified that the public
3132: * point lies on the curve. This is done by EC_POINT_oct2point()
3133: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3134: * reachable with public points not unmarshalled using
3135: * EC_POINT_oct2point then the caller will need to explicitly check.
3136: */
1.1 djm 3137:
3138: if ((bnctx = BN_CTX_new()) == NULL)
3139: return SSH_ERR_ALLOC_FAIL;
3140: BN_CTX_start(bnctx);
3141:
3142: /*
3143: * We shouldn't ever hit this case because bignum_get_ecpoint()
3144: * refuses to load GF2m points.
3145: */
3146: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3147: NID_X9_62_prime_field)
3148: goto out;
3149:
3150: /* Q != infinity */
3151: if (EC_POINT_is_at_infinity(group, public))
3152: goto out;
3153:
3154: if ((x = BN_CTX_get(bnctx)) == NULL ||
3155: (y = BN_CTX_get(bnctx)) == NULL ||
3156: (order = BN_CTX_get(bnctx)) == NULL ||
3157: (tmp = BN_CTX_get(bnctx)) == NULL) {
3158: ret = SSH_ERR_ALLOC_FAIL;
3159: goto out;
3160: }
3161:
3162: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3163: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3164: EC_POINT_get_affine_coordinates_GFp(group, public,
3165: x, y, bnctx) != 1) {
3166: ret = SSH_ERR_LIBCRYPTO_ERROR;
3167: goto out;
3168: }
3169: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3170: BN_num_bits(y) <= BN_num_bits(order) / 2)
3171: goto out;
3172:
3173: /* nQ == infinity (n == order of subgroup) */
3174: if ((nq = EC_POINT_new(group)) == NULL) {
3175: ret = SSH_ERR_ALLOC_FAIL;
3176: goto out;
3177: }
3178: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3179: ret = SSH_ERR_LIBCRYPTO_ERROR;
3180: goto out;
3181: }
3182: if (EC_POINT_is_at_infinity(group, nq) != 1)
3183: goto out;
3184:
3185: /* x < order - 1, y < order - 1 */
3186: if (!BN_sub(tmp, order, BN_value_one())) {
3187: ret = SSH_ERR_LIBCRYPTO_ERROR;
3188: goto out;
3189: }
3190: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3191: goto out;
3192: ret = 0;
3193: out:
3194: BN_CTX_free(bnctx);
1.60 jsing 3195: EC_POINT_free(nq);
1.1 djm 3196: return ret;
3197: }
3198:
3199: int
3200: sshkey_ec_validate_private(const EC_KEY *key)
3201: {
3202: BN_CTX *bnctx;
3203: BIGNUM *order, *tmp;
3204: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3205:
3206: if ((bnctx = BN_CTX_new()) == NULL)
3207: return SSH_ERR_ALLOC_FAIL;
3208: BN_CTX_start(bnctx);
3209:
3210: if ((order = BN_CTX_get(bnctx)) == NULL ||
3211: (tmp = BN_CTX_get(bnctx)) == NULL) {
3212: ret = SSH_ERR_ALLOC_FAIL;
3213: goto out;
3214: }
3215:
3216: /* log2(private) > log2(order)/2 */
3217: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3218: ret = SSH_ERR_LIBCRYPTO_ERROR;
3219: goto out;
3220: }
3221: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3222: BN_num_bits(order) / 2)
3223: goto out;
3224:
3225: /* private < order - 1 */
3226: if (!BN_sub(tmp, order, BN_value_one())) {
3227: ret = SSH_ERR_LIBCRYPTO_ERROR;
3228: goto out;
3229: }
3230: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3231: goto out;
3232: ret = 0;
3233: out:
3234: BN_CTX_free(bnctx);
3235: return ret;
3236: }
3237:
3238: void
3239: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3240: {
3241: BIGNUM *x, *y;
3242: BN_CTX *bnctx;
3243:
3244: if (point == NULL) {
3245: fputs("point=(NULL)\n", stderr);
3246: return;
3247: }
3248: if ((bnctx = BN_CTX_new()) == NULL) {
3249: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3250: return;
3251: }
3252: BN_CTX_start(bnctx);
3253: if ((x = BN_CTX_get(bnctx)) == NULL ||
3254: (y = BN_CTX_get(bnctx)) == NULL) {
3255: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3256: return;
3257: }
3258: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3259: NID_X9_62_prime_field) {
3260: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3261: return;
3262: }
3263: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3264: bnctx) != 1) {
3265: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3266: __func__);
3267: return;
3268: }
3269: fputs("x=", stderr);
3270: BN_print_fp(stderr, x);
3271: fputs("\ny=", stderr);
3272: BN_print_fp(stderr, y);
3273: fputs("\n", stderr);
3274: BN_CTX_free(bnctx);
3275: }
3276:
3277: void
3278: sshkey_dump_ec_key(const EC_KEY *key)
3279: {
3280: const BIGNUM *exponent;
3281:
3282: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3283: EC_KEY_get0_public_key(key));
3284: fputs("exponent=", stderr);
3285: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3286: fputs("(NULL)", stderr);
3287: else
3288: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3289: fputs("\n", stderr);
3290: }
3291: #endif /* WITH_OPENSSL */
3292:
3293: static int
3294: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
3295: const char *passphrase, const char *comment, const char *ciphername,
3296: int rounds)
3297: {
1.4 djm 3298: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3299: u_char salt[SALT_LEN];
1.4 djm 3300: char *b64 = NULL;
1.1 djm 3301: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3302: u_int check;
3303: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3304: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3305: const struct sshcipher *cipher;
3306: const char *kdfname = KDFNAME;
3307: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3308:
3309: if (rounds <= 0)
3310: rounds = DEFAULT_ROUNDS;
3311: if (passphrase == NULL || !strlen(passphrase)) {
3312: ciphername = "none";
3313: kdfname = "none";
3314: } else if (ciphername == NULL)
3315: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3316: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3317: r = SSH_ERR_INVALID_ARGUMENT;
3318: goto out;
3319: }
3320:
3321: if ((kdf = sshbuf_new()) == NULL ||
3322: (encoded = sshbuf_new()) == NULL ||
3323: (encrypted = sshbuf_new()) == NULL) {
3324: r = SSH_ERR_ALLOC_FAIL;
3325: goto out;
3326: }
3327: blocksize = cipher_blocksize(cipher);
3328: keylen = cipher_keylen(cipher);
3329: ivlen = cipher_ivlen(cipher);
3330: authlen = cipher_authlen(cipher);
3331: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3332: r = SSH_ERR_ALLOC_FAIL;
3333: goto out;
3334: }
3335: if (strcmp(kdfname, "bcrypt") == 0) {
3336: arc4random_buf(salt, SALT_LEN);
3337: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3338: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3339: r = SSH_ERR_INVALID_ARGUMENT;
3340: goto out;
3341: }
3342: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3343: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3344: goto out;
3345: } else if (strcmp(kdfname, "none") != 0) {
3346: /* Unsupported KDF type */
3347: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3348: goto out;
3349: }
3350: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3351: key + keylen, ivlen, 1)) != 0)
3352: goto out;
3353:
3354: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3355: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3356: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3357: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3358: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3359: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3360: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3361: goto out;
3362:
3363: /* set up the buffer that will be encrypted */
3364:
3365: /* Random check bytes */
3366: check = arc4random();
3367: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3368: (r = sshbuf_put_u32(encrypted, check)) != 0)
3369: goto out;
3370:
3371: /* append private key and comment*/
1.62 markus 3372: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3373: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3374: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3375: goto out;
3376:
3377: /* padding */
3378: i = 0;
3379: while (sshbuf_len(encrypted) % blocksize) {
3380: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3381: goto out;
3382: }
3383:
3384: /* length in destination buffer */
3385: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3386: goto out;
3387:
3388: /* encrypt */
3389: if ((r = sshbuf_reserve(encoded,
3390: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3391: goto out;
1.36 djm 3392: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3393: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3394: goto out;
3395:
3396: /* uuencode */
3397: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3398: r = SSH_ERR_ALLOC_FAIL;
3399: goto out;
3400: }
3401:
3402: sshbuf_reset(blob);
3403: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3404: goto out;
3405: for (i = 0; i < strlen(b64); i++) {
3406: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3407: goto out;
3408: /* insert line breaks */
3409: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3410: goto out;
3411: }
3412: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3413: goto out;
3414: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3415: goto out;
3416:
3417: /* success */
3418: r = 0;
3419:
3420: out:
3421: sshbuf_free(kdf);
3422: sshbuf_free(encoded);
3423: sshbuf_free(encrypted);
1.36 djm 3424: cipher_free(ciphercontext);
1.1 djm 3425: explicit_bzero(salt, sizeof(salt));
3426: if (key != NULL) {
3427: explicit_bzero(key, keylen + ivlen);
3428: free(key);
3429: }
3430: if (pubkeyblob != NULL) {
3431: explicit_bzero(pubkeyblob, pubkeylen);
3432: free(pubkeyblob);
3433: }
3434: if (b64 != NULL) {
3435: explicit_bzero(b64, strlen(b64));
3436: free(b64);
3437: }
3438: return r;
3439: }
3440:
3441: static int
3442: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3443: struct sshkey **keyp, char **commentp)
3444: {
3445: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3446: const struct sshcipher *cipher = NULL;
3447: const u_char *cp;
3448: int r = SSH_ERR_INTERNAL_ERROR;
3449: size_t encoded_len;
1.18 djm 3450: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3451: struct sshbuf *encoded = NULL, *decoded = NULL;
3452: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3453: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3454: struct sshkey *k = NULL;
3455: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3456: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3457:
3458: if (keyp != NULL)
3459: *keyp = NULL;
3460: if (commentp != NULL)
3461: *commentp = NULL;
3462:
3463: if ((encoded = sshbuf_new()) == NULL ||
3464: (decoded = sshbuf_new()) == NULL ||
3465: (decrypted = sshbuf_new()) == NULL) {
3466: r = SSH_ERR_ALLOC_FAIL;
3467: goto out;
3468: }
3469:
3470: /* check preamble */
3471: cp = sshbuf_ptr(blob);
3472: encoded_len = sshbuf_len(blob);
3473: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3474: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3475: r = SSH_ERR_INVALID_FORMAT;
3476: goto out;
3477: }
3478: cp += MARK_BEGIN_LEN;
3479: encoded_len -= MARK_BEGIN_LEN;
3480:
3481: /* Look for end marker, removing whitespace as we go */
3482: while (encoded_len > 0) {
3483: if (*cp != '\n' && *cp != '\r') {
3484: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3485: goto out;
3486: }
3487: last = *cp;
3488: encoded_len--;
3489: cp++;
3490: if (last == '\n') {
3491: if (encoded_len >= MARK_END_LEN &&
3492: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3493: /* \0 terminate */
3494: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3495: goto out;
3496: break;
3497: }
3498: }
3499: }
3500: if (encoded_len == 0) {
3501: r = SSH_ERR_INVALID_FORMAT;
3502: goto out;
3503: }
3504:
3505: /* decode base64 */
1.4 djm 3506: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3507: goto out;
3508:
3509: /* check magic */
3510: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3511: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3512: r = SSH_ERR_INVALID_FORMAT;
3513: goto out;
3514: }
3515: /* parse public portion of key */
3516: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3517: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3518: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3519: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3520: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3521: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3522: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3523: goto out;
3524:
3525: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3526: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3527: goto out;
3528: }
3529: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3530: strcmp(ciphername, "none") != 0) {
3531: /* passphrase required */
3532: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3533: goto out;
3534: }
3535: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3536: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3537: goto out;
3538: }
3539: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3540: r = SSH_ERR_INVALID_FORMAT;
3541: goto out;
3542: }
3543: if (nkeys != 1) {
3544: /* XXX only one key supported */
3545: r = SSH_ERR_INVALID_FORMAT;
3546: goto out;
3547: }
3548:
3549: /* check size of encrypted key blob */
3550: blocksize = cipher_blocksize(cipher);
3551: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3552: r = SSH_ERR_INVALID_FORMAT;
3553: goto out;
3554: }
3555:
3556: /* setup key */
3557: keylen = cipher_keylen(cipher);
3558: ivlen = cipher_ivlen(cipher);
1.18 djm 3559: authlen = cipher_authlen(cipher);
1.1 djm 3560: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3561: r = SSH_ERR_ALLOC_FAIL;
3562: goto out;
3563: }
3564: if (strcmp(kdfname, "bcrypt") == 0) {
3565: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3566: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3567: goto out;
3568: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3569: key, keylen + ivlen, rounds) < 0) {
3570: r = SSH_ERR_INVALID_FORMAT;
3571: goto out;
3572: }
3573: }
3574:
1.18 djm 3575: /* check that an appropriate amount of auth data is present */
3576: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3577: r = SSH_ERR_INVALID_FORMAT;
3578: goto out;
3579: }
3580:
1.1 djm 3581: /* decrypt private portion of key */
3582: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3583: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3584: key + keylen, ivlen, 0)) != 0)
3585: goto out;
1.36 djm 3586: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3587: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3588: /* an integrity error here indicates an incorrect passphrase */
3589: if (r == SSH_ERR_MAC_INVALID)
3590: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3591: goto out;
3592: }
1.18 djm 3593: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3594: goto out;
3595: /* there should be no trailing data */
3596: if (sshbuf_len(decoded) != 0) {
3597: r = SSH_ERR_INVALID_FORMAT;
3598: goto out;
3599: }
3600:
3601: /* check check bytes */
3602: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3603: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3604: goto out;
3605: if (check1 != check2) {
3606: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3607: goto out;
3608: }
3609:
3610: /* Load the private key and comment */
3611: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3612: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3613: goto out;
3614:
3615: /* Check deterministic padding */
3616: i = 0;
3617: while (sshbuf_len(decrypted)) {
3618: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3619: goto out;
3620: if (pad != (++i & 0xff)) {
3621: r = SSH_ERR_INVALID_FORMAT;
3622: goto out;
3623: }
3624: }
3625:
3626: /* XXX decode pubkey and check against private */
3627:
3628: /* success */
3629: r = 0;
3630: if (keyp != NULL) {
3631: *keyp = k;
3632: k = NULL;
3633: }
3634: if (commentp != NULL) {
3635: *commentp = comment;
3636: comment = NULL;
3637: }
3638: out:
3639: pad = 0;
1.36 djm 3640: cipher_free(ciphercontext);
1.1 djm 3641: free(ciphername);
3642: free(kdfname);
3643: free(comment);
3644: if (salt != NULL) {
3645: explicit_bzero(salt, slen);
3646: free(salt);
3647: }
3648: if (key != NULL) {
3649: explicit_bzero(key, keylen + ivlen);
3650: free(key);
3651: }
3652: sshbuf_free(encoded);
3653: sshbuf_free(decoded);
3654: sshbuf_free(kdf);
3655: sshbuf_free(decrypted);
3656: sshkey_free(k);
3657: return r;
3658: }
3659:
3660:
3661: #ifdef WITH_OPENSSL
3662: /* convert SSH v2 key in OpenSSL PEM format */
3663: static int
3664: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3665: const char *_passphrase, const char *comment)
3666: {
3667: int success, r;
3668: int blen, len = strlen(_passphrase);
3669: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3670: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3671: char *bptr;
1.1 djm 3672: BIO *bio = NULL;
3673:
3674: if (len > 0 && len <= 4)
3675: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3676: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3677: return SSH_ERR_ALLOC_FAIL;
3678:
3679: switch (key->type) {
3680: case KEY_DSA:
3681: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3682: cipher, passphrase, len, NULL, NULL);
3683: break;
3684: case KEY_ECDSA:
3685: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3686: cipher, passphrase, len, NULL, NULL);
3687: break;
3688: case KEY_RSA:
3689: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3690: cipher, passphrase, len, NULL, NULL);
3691: break;
3692: default:
3693: success = 0;
3694: break;
3695: }
3696: if (success == 0) {
3697: r = SSH_ERR_LIBCRYPTO_ERROR;
3698: goto out;
3699: }
3700: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3701: r = SSH_ERR_INTERNAL_ERROR;
3702: goto out;
3703: }
3704: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3705: goto out;
3706: r = 0;
3707: out:
3708: BIO_free(bio);
3709: return r;
3710: }
3711: #endif /* WITH_OPENSSL */
3712:
3713: /* Serialise "key" to buffer "blob" */
3714: int
3715: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3716: const char *passphrase, const char *comment,
3717: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3718: {
3719: switch (key->type) {
1.9 markus 3720: #ifdef WITH_OPENSSL
1.1 djm 3721: case KEY_DSA:
3722: case KEY_ECDSA:
3723: case KEY_RSA:
3724: if (force_new_format) {
3725: return sshkey_private_to_blob2(key, blob, passphrase,
3726: comment, new_format_cipher, new_format_rounds);
3727: }
3728: return sshkey_private_pem_to_blob(key, blob,
3729: passphrase, comment);
3730: #endif /* WITH_OPENSSL */
3731: case KEY_ED25519:
1.62 markus 3732: #ifdef WITH_XMSS
3733: case KEY_XMSS:
3734: #endif /* WITH_XMSS */
1.1 djm 3735: return sshkey_private_to_blob2(key, blob, passphrase,
3736: comment, new_format_cipher, new_format_rounds);
3737: default:
3738: return SSH_ERR_KEY_TYPE_UNKNOWN;
3739: }
3740: }
3741:
3742:
3743: #ifdef WITH_OPENSSL
1.8 djm 3744: static int
1.52 djm 3745: translate_libcrypto_error(unsigned long pem_err)
3746: {
3747: int pem_reason = ERR_GET_REASON(pem_err);
3748:
3749: switch (ERR_GET_LIB(pem_err)) {
3750: case ERR_LIB_PEM:
3751: switch (pem_reason) {
3752: case PEM_R_BAD_PASSWORD_READ:
3753: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3754: case PEM_R_BAD_DECRYPT:
3755: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3756: default:
3757: return SSH_ERR_INVALID_FORMAT;
3758: }
3759: case ERR_LIB_EVP:
3760: switch (pem_reason) {
3761: case EVP_R_BAD_DECRYPT:
3762: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3763: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3764: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3765: #endif
1.52 djm 3766: case EVP_R_DECODE_ERROR:
3767: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3768: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3769: #endif
3770: return SSH_ERR_INVALID_FORMAT;
3771: default:
3772: return SSH_ERR_LIBCRYPTO_ERROR;
3773: }
3774: case ERR_LIB_ASN1:
3775: return SSH_ERR_INVALID_FORMAT;
3776: }
3777: return SSH_ERR_LIBCRYPTO_ERROR;
3778: }
3779:
3780: static void
3781: clear_libcrypto_errors(void)
3782: {
3783: while (ERR_get_error() != 0)
3784: ;
3785: }
3786:
3787: /*
3788: * Translate OpenSSL error codes to determine whether
3789: * passphrase is required/incorrect.
3790: */
3791: static int
3792: convert_libcrypto_error(void)
3793: {
3794: /*
3795: * Some password errors are reported at the beginning
3796: * of the error queue.
3797: */
3798: if (translate_libcrypto_error(ERR_peek_error()) ==
3799: SSH_ERR_KEY_WRONG_PASSPHRASE)
3800: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3801: return translate_libcrypto_error(ERR_peek_last_error());
3802: }
3803:
3804: static int
1.1 djm 3805: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3806: const char *passphrase, struct sshkey **keyp)
1.1 djm 3807: {
3808: EVP_PKEY *pk = NULL;
3809: struct sshkey *prv = NULL;
3810: BIO *bio = NULL;
3811: int r;
3812:
1.32 djm 3813: if (keyp != NULL)
3814: *keyp = NULL;
1.1 djm 3815:
3816: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3817: return SSH_ERR_ALLOC_FAIL;
3818: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3819: (int)sshbuf_len(blob)) {
3820: r = SSH_ERR_ALLOC_FAIL;
3821: goto out;
3822: }
3823:
1.52 djm 3824: clear_libcrypto_errors();
1.1 djm 3825: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3826: (char *)passphrase)) == NULL) {
1.71 djm 3827: /*
3828: * libcrypto may return various ASN.1 errors when attempting
3829: * to parse a key with an incorrect passphrase.
3830: * Treat all format errors as "incorrect passphrase" if a
3831: * passphrase was supplied.
3832: */
3833: if (passphrase != NULL && *passphrase != '\0')
3834: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3835: else
3836: r = convert_libcrypto_error();
1.1 djm 3837: goto out;
3838: }
1.69 djm 3839: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3840: (type == KEY_UNSPEC || type == KEY_RSA)) {
3841: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3842: r = SSH_ERR_ALLOC_FAIL;
3843: goto out;
3844: }
3845: prv->rsa = EVP_PKEY_get1_RSA(pk);
3846: prv->type = KEY_RSA;
3847: #ifdef DEBUG_PK
3848: RSA_print_fp(stderr, prv->rsa, 8);
3849: #endif
3850: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3851: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3852: goto out;
3853: }
1.69 djm 3854: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 3855: goto out;
1.69 djm 3856: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3857: (type == KEY_UNSPEC || type == KEY_DSA)) {
3858: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3859: r = SSH_ERR_ALLOC_FAIL;
3860: goto out;
3861: }
3862: prv->dsa = EVP_PKEY_get1_DSA(pk);
3863: prv->type = KEY_DSA;
3864: #ifdef DEBUG_PK
3865: DSA_print_fp(stderr, prv->dsa, 8);
3866: #endif
1.69 djm 3867: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3868: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3869: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3870: r = SSH_ERR_ALLOC_FAIL;
3871: goto out;
3872: }
3873: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3874: prv->type = KEY_ECDSA;
3875: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3876: if (prv->ecdsa_nid == -1 ||
3877: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3878: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3879: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3880: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3881: r = SSH_ERR_INVALID_FORMAT;
3882: goto out;
3883: }
3884: #ifdef DEBUG_PK
3885: if (prv != NULL && prv->ecdsa != NULL)
3886: sshkey_dump_ec_key(prv->ecdsa);
3887: #endif
3888: } else {
3889: r = SSH_ERR_INVALID_FORMAT;
3890: goto out;
3891: }
3892: r = 0;
1.32 djm 3893: if (keyp != NULL) {
3894: *keyp = prv;
3895: prv = NULL;
3896: }
1.1 djm 3897: out:
3898: BIO_free(bio);
1.60 jsing 3899: EVP_PKEY_free(pk);
1.30 mmcc 3900: sshkey_free(prv);
1.1 djm 3901: return r;
3902: }
3903: #endif /* WITH_OPENSSL */
3904:
3905: int
3906: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3907: const char *passphrase, struct sshkey **keyp, char **commentp)
3908: {
1.42 djm 3909: int r = SSH_ERR_INTERNAL_ERROR;
3910:
1.32 djm 3911: if (keyp != NULL)
3912: *keyp = NULL;
1.1 djm 3913: if (commentp != NULL)
3914: *commentp = NULL;
3915:
3916: switch (type) {
1.9 markus 3917: #ifdef WITH_OPENSSL
1.1 djm 3918: case KEY_DSA:
3919: case KEY_ECDSA:
3920: case KEY_RSA:
1.8 djm 3921: return sshkey_parse_private_pem_fileblob(blob, type,
3922: passphrase, keyp);
1.1 djm 3923: #endif /* WITH_OPENSSL */
3924: case KEY_ED25519:
1.62 markus 3925: #ifdef WITH_XMSS
3926: case KEY_XMSS:
3927: #endif /* WITH_XMSS */
1.1 djm 3928: return sshkey_parse_private2(blob, type, passphrase,
3929: keyp, commentp);
3930: case KEY_UNSPEC:
1.42 djm 3931: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3932: commentp);
3933: /* Do not fallback to PEM parser if only passphrase is wrong. */
3934: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
3935: return r;
1.1 djm 3936: #ifdef WITH_OPENSSL
1.8 djm 3937: return sshkey_parse_private_pem_fileblob(blob, type,
3938: passphrase, keyp);
1.1 djm 3939: #else
3940: return SSH_ERR_INVALID_FORMAT;
3941: #endif /* WITH_OPENSSL */
3942: default:
3943: return SSH_ERR_KEY_TYPE_UNKNOWN;
3944: }
3945: }
3946:
3947: int
3948: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3949: struct sshkey **keyp, char **commentp)
1.1 djm 3950: {
3951: if (keyp != NULL)
3952: *keyp = NULL;
3953: if (commentp != NULL)
3954: *commentp = NULL;
3955:
1.23 tim 3956: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3957: passphrase, keyp, commentp);
1.1 djm 3958: }
1.62 markus 3959:
3960: #ifdef WITH_XMSS
3961: /*
3962: * serialize the key with the current state and forward the state
3963: * maxsign times.
3964: */
3965: int
3966: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
3967: u_int32_t maxsign, sshkey_printfn *pr)
3968: {
3969: int r, rupdate;
3970:
3971: if (maxsign == 0 ||
3972: sshkey_type_plain(k->type) != KEY_XMSS)
3973: return sshkey_private_serialize_opt(k, b,
3974: SSHKEY_SERIALIZE_DEFAULT);
3975: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
3976: (r = sshkey_private_serialize_opt(k, b,
3977: SSHKEY_SERIALIZE_STATE)) != 0 ||
3978: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3979: goto out;
3980: r = 0;
3981: out:
3982: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
3983: if (r == 0)
3984: r = rupdate;
3985: }
3986: return r;
3987: }
3988:
3989: u_int32_t
3990: sshkey_signatures_left(const struct sshkey *k)
3991: {
3992: if (sshkey_type_plain(k->type) == KEY_XMSS)
3993: return sshkey_xmss_signatures_left(k);
3994: return 0;
3995: }
3996:
3997: int
3998: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3999: {
4000: if (sshkey_type_plain(k->type) != KEY_XMSS)
4001: return SSH_ERR_INVALID_ARGUMENT;
4002: return sshkey_xmss_enable_maxsign(k, maxsign);
4003: }
4004:
4005: int
4006: sshkey_set_filename(struct sshkey *k, const char *filename)
4007: {
4008: if (k == NULL)
4009: return SSH_ERR_INVALID_ARGUMENT;
4010: if (sshkey_type_plain(k->type) != KEY_XMSS)
4011: return 0;
4012: if (filename == NULL)
4013: return SSH_ERR_INVALID_ARGUMENT;
4014: if ((k->xmss_filename = strdup(filename)) == NULL)
4015: return SSH_ERR_ALLOC_FAIL;
4016: return 0;
4017: }
4018: #else
4019: int
4020: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4021: u_int32_t maxsign, sshkey_printfn *pr)
4022: {
4023: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4024: }
4025:
4026: u_int32_t
4027: sshkey_signatures_left(const struct sshkey *k)
4028: {
4029: return 0;
4030: }
4031:
4032: int
4033: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4034: {
4035: return SSH_ERR_INVALID_ARGUMENT;
4036: }
4037:
4038: int
4039: sshkey_set_filename(struct sshkey *k, const char *filename)
4040: {
4041: if (k == NULL)
4042: return SSH_ERR_INVALID_ARGUMENT;
4043: return 0;
4044: }
4045: #endif /* WITH_XMSS */