Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.69
1.69 ! djm 1: /* $OpenBSD: sshkey.c,v 1.68 2018/09/12 01:32:54 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"
1.62 markus 54: #include "sshkey-xmss.h"
1.11 djm 55: #include "match.h"
1.1 djm 56:
1.62 markus 57: #include "xmss_fast.h"
58:
1.1 djm 59: /* openssh private key file format */
60: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
61: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
62: #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
63: #define MARK_END_LEN (sizeof(MARK_END) - 1)
64: #define KDFNAME "bcrypt"
65: #define AUTH_MAGIC "openssh-key-v1"
66: #define SALT_LEN 16
1.56 djm 67: #define DEFAULT_CIPHERNAME "aes256-ctr"
1.1 djm 68: #define DEFAULT_ROUNDS 16
69:
70: /* Version identification string for SSH v1 identity files. */
71: #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
72:
1.62 markus 73: int sshkey_private_serialize_opt(const struct sshkey *key,
74: struct sshbuf *buf, enum sshkey_serialize_rep);
1.14 djm 75: static int sshkey_from_blob_internal(struct sshbuf *buf,
1.1 djm 76: struct sshkey **keyp, int allow_cert);
1.67 djm 77: static int get_sigtype(const u_char *sig, size_t siglen, char **sigtypep);
1.1 djm 78:
79: /* Supported key types */
80: struct keytype {
81: const char *name;
82: const char *shortname;
1.65 djm 83: const char *sigalg;
1.1 djm 84: int type;
85: int nid;
86: int cert;
1.28 markus 87: int sigonly;
1.1 djm 88: };
89: static const struct keytype keytypes[] = {
1.65 djm 90: { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 },
91: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL,
1.28 markus 92: KEY_ED25519_CERT, 0, 1, 0 },
1.62 markus 93: #ifdef WITH_XMSS
1.65 djm 94: { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 },
95: { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL,
1.62 markus 96: KEY_XMSS_CERT, 0, 1, 0 },
97: #endif /* WITH_XMSS */
1.1 djm 98: #ifdef WITH_OPENSSL
1.65 djm 99: { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 },
100: { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 },
101: { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 },
102: { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 },
103: { "ecdsa-sha2-nistp256", "ECDSA", NULL,
104: KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
105: { "ecdsa-sha2-nistp384", "ECDSA", NULL,
106: KEY_ECDSA, NID_secp384r1, 0, 0 },
107: { "ecdsa-sha2-nistp521", "ECDSA", NULL,
108: KEY_ECDSA, NID_secp521r1, 0, 0 },
109: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL,
110: KEY_RSA_CERT, 0, 1, 0 },
111: { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT",
112: "ssh-rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
113: { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT",
114: "ssh-rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
115: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL,
116: KEY_DSA_CERT, 0, 1, 0 },
117: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 118: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
1.65 djm 119: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL,
1.28 markus 120: KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
1.65 djm 121: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL,
122: KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
1.1 djm 123: #endif /* WITH_OPENSSL */
1.65 djm 124: { NULL, NULL, NULL, -1, -1, 0, 0 }
1.1 djm 125: };
126:
127: const char *
128: sshkey_type(const struct sshkey *k)
129: {
130: const struct keytype *kt;
131:
132: for (kt = keytypes; kt->type != -1; kt++) {
133: if (kt->type == k->type)
134: return kt->shortname;
135: }
136: return "unknown";
137: }
138:
139: static const char *
140: sshkey_ssh_name_from_type_nid(int type, int nid)
141: {
142: const struct keytype *kt;
143:
144: for (kt = keytypes; kt->type != -1; kt++) {
145: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
146: return kt->name;
147: }
148: return "ssh-unknown";
149: }
150:
151: int
152: sshkey_type_is_cert(int type)
153: {
154: const struct keytype *kt;
155:
156: for (kt = keytypes; kt->type != -1; kt++) {
157: if (kt->type == type)
158: return kt->cert;
159: }
160: return 0;
161: }
162:
163: const char *
164: sshkey_ssh_name(const struct sshkey *k)
165: {
166: return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
167: }
168:
169: const char *
170: sshkey_ssh_name_plain(const struct sshkey *k)
171: {
172: return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
173: k->ecdsa_nid);
174: }
175:
176: int
177: sshkey_type_from_name(const char *name)
178: {
179: const struct keytype *kt;
180:
181: for (kt = keytypes; kt->type != -1; kt++) {
182: /* Only allow shortname matches for plain key types */
183: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
184: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
185: return kt->type;
186: }
187: return KEY_UNSPEC;
188: }
189:
190: int
191: sshkey_ecdsa_nid_from_name(const char *name)
192: {
193: const struct keytype *kt;
194:
1.4 djm 195: for (kt = keytypes; kt->type != -1; kt++) {
196: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
197: continue;
198: if (kt->name != NULL && strcmp(name, kt->name) == 0)
199: return kt->nid;
200: }
1.1 djm 201: return -1;
202: }
203:
204: char *
1.45 djm 205: sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
1.1 djm 206: {
207: char *tmp, *ret = NULL;
208: size_t nlen, rlen = 0;
209: const struct keytype *kt;
210:
211: for (kt = keytypes; kt->type != -1; kt++) {
1.45 djm 212: if (kt->name == NULL)
213: continue;
214: if (!include_sigonly && kt->sigonly)
1.1 djm 215: continue;
216: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
217: continue;
218: if (ret != NULL)
1.38 djm 219: ret[rlen++] = sep;
1.1 djm 220: nlen = strlen(kt->name);
221: if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
222: free(ret);
223: return NULL;
224: }
225: ret = tmp;
226: memcpy(ret + rlen, kt->name, nlen + 1);
227: rlen += nlen;
228: }
229: return ret;
230: }
231:
232: int
1.11 djm 233: sshkey_names_valid2(const char *names, int allow_wildcard)
1.1 djm 234: {
235: char *s, *cp, *p;
1.11 djm 236: const struct keytype *kt;
237: int type;
1.1 djm 238:
239: if (names == NULL || strcmp(names, "") == 0)
240: return 0;
241: if ((s = cp = strdup(names)) == NULL)
242: return 0;
243: for ((p = strsep(&cp, ",")); p && *p != '\0';
244: (p = strsep(&cp, ","))) {
1.11 djm 245: type = sshkey_type_from_name(p);
246: if (type == KEY_UNSPEC) {
247: if (allow_wildcard) {
248: /*
249: * Try matching key types against the string.
250: * If any has a positive or negative match then
251: * the component is accepted.
252: */
253: for (kt = keytypes; kt->type != -1; kt++) {
254: if (match_pattern_list(kt->name,
1.17 djm 255: p, 0) != 0)
1.11 djm 256: break;
257: }
258: if (kt->type != -1)
259: continue;
260: }
1.1 djm 261: free(s);
262: return 0;
263: }
264: }
265: free(s);
266: return 1;
267: }
268:
269: u_int
270: sshkey_size(const struct sshkey *k)
271: {
1.69 ! djm 272: #ifdef WITH_OPENSSL
! 273: const BIGNUM *rsa_n, *dsa_p;
! 274: #endif /* WITH_OPENSSL */
! 275:
1.1 djm 276: switch (k->type) {
277: #ifdef WITH_OPENSSL
278: case KEY_RSA:
279: case KEY_RSA_CERT:
1.69 ! djm 280: if (k->rsa == NULL)
! 281: return 0;
! 282: RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
! 283: return BN_num_bits(rsa_n);
1.1 djm 284: case KEY_DSA:
285: case KEY_DSA_CERT:
1.69 ! djm 286: if (k->dsa == NULL)
! 287: return 0;
! 288: DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL);
! 289: return BN_num_bits(dsa_p);
1.1 djm 290: case KEY_ECDSA:
291: case KEY_ECDSA_CERT:
292: return sshkey_curve_nid_to_bits(k->ecdsa_nid);
293: #endif /* WITH_OPENSSL */
294: case KEY_ED25519:
295: case KEY_ED25519_CERT:
1.62 markus 296: case KEY_XMSS:
297: case KEY_XMSS_CERT:
1.1 djm 298: return 256; /* XXX */
299: }
300: return 0;
301: }
302:
303: static int
304: sshkey_type_is_valid_ca(int type)
305: {
306: switch (type) {
307: case KEY_RSA:
308: case KEY_DSA:
309: case KEY_ECDSA:
310: case KEY_ED25519:
1.62 markus 311: case KEY_XMSS:
1.1 djm 312: return 1;
313: default:
314: return 0;
315: }
316: }
317:
318: int
319: sshkey_is_cert(const struct sshkey *k)
320: {
321: if (k == NULL)
322: return 0;
323: return sshkey_type_is_cert(k->type);
324: }
325:
326: /* Return the cert-less equivalent to a certified key type */
327: int
328: sshkey_type_plain(int type)
329: {
330: switch (type) {
331: case KEY_RSA_CERT:
332: return KEY_RSA;
333: case KEY_DSA_CERT:
334: return KEY_DSA;
335: case KEY_ECDSA_CERT:
336: return KEY_ECDSA;
337: case KEY_ED25519_CERT:
338: return KEY_ED25519;
1.62 markus 339: case KEY_XMSS_CERT:
340: return KEY_XMSS;
1.1 djm 341: default:
342: return type;
343: }
344: }
345:
346: #ifdef WITH_OPENSSL
347: /* XXX: these are really begging for a table-driven approach */
348: int
349: sshkey_curve_name_to_nid(const char *name)
350: {
351: if (strcmp(name, "nistp256") == 0)
352: return NID_X9_62_prime256v1;
353: else if (strcmp(name, "nistp384") == 0)
354: return NID_secp384r1;
355: else if (strcmp(name, "nistp521") == 0)
356: return NID_secp521r1;
357: else
358: return -1;
359: }
360:
361: u_int
362: sshkey_curve_nid_to_bits(int nid)
363: {
364: switch (nid) {
365: case NID_X9_62_prime256v1:
366: return 256;
367: case NID_secp384r1:
368: return 384;
369: case NID_secp521r1:
370: return 521;
371: default:
372: return 0;
373: }
374: }
375:
376: int
377: sshkey_ecdsa_bits_to_nid(int bits)
378: {
379: switch (bits) {
380: case 256:
381: return NID_X9_62_prime256v1;
382: case 384:
383: return NID_secp384r1;
384: case 521:
385: return NID_secp521r1;
386: default:
387: return -1;
388: }
389: }
390:
391: const char *
392: sshkey_curve_nid_to_name(int nid)
393: {
394: switch (nid) {
395: case NID_X9_62_prime256v1:
396: return "nistp256";
397: case NID_secp384r1:
398: return "nistp384";
399: case NID_secp521r1:
400: return "nistp521";
401: default:
402: return NULL;
403: }
404: }
405:
406: int
407: sshkey_ec_nid_to_hash_alg(int nid)
408: {
409: int kbits = sshkey_curve_nid_to_bits(nid);
410:
411: if (kbits <= 0)
412: return -1;
413:
414: /* RFC5656 section 6.2.1 */
415: if (kbits <= 256)
416: return SSH_DIGEST_SHA256;
417: else if (kbits <= 384)
418: return SSH_DIGEST_SHA384;
419: else
420: return SSH_DIGEST_SHA512;
421: }
422: #endif /* WITH_OPENSSL */
423:
424: static void
425: cert_free(struct sshkey_cert *cert)
426: {
427: u_int i;
428:
429: if (cert == NULL)
430: return;
1.31 mmcc 431: sshbuf_free(cert->certblob);
432: sshbuf_free(cert->critical);
433: sshbuf_free(cert->extensions);
1.29 mmcc 434: free(cert->key_id);
1.1 djm 435: for (i = 0; i < cert->nprincipals; i++)
436: free(cert->principals[i]);
1.29 mmcc 437: free(cert->principals);
1.30 mmcc 438: sshkey_free(cert->signature_key);
1.67 djm 439: free(cert->signature_type);
1.61 jsing 440: freezero(cert, sizeof(*cert));
1.1 djm 441: }
442:
443: static struct sshkey_cert *
444: cert_new(void)
445: {
446: struct sshkey_cert *cert;
447:
448: if ((cert = calloc(1, sizeof(*cert))) == NULL)
449: return NULL;
450: if ((cert->certblob = sshbuf_new()) == NULL ||
451: (cert->critical = sshbuf_new()) == NULL ||
452: (cert->extensions = sshbuf_new()) == NULL) {
453: cert_free(cert);
454: return NULL;
455: }
456: cert->key_id = NULL;
457: cert->principals = NULL;
458: cert->signature_key = NULL;
1.67 djm 459: cert->signature_type = NULL;
1.1 djm 460: return cert;
461: }
462:
463: struct sshkey *
464: sshkey_new(int type)
465: {
466: struct sshkey *k;
467: #ifdef WITH_OPENSSL
468: RSA *rsa;
469: DSA *dsa;
470: #endif /* WITH_OPENSSL */
471:
472: if ((k = calloc(1, sizeof(*k))) == NULL)
473: return NULL;
474: k->type = type;
475: k->ecdsa = NULL;
476: k->ecdsa_nid = -1;
477: k->dsa = NULL;
478: k->rsa = NULL;
479: k->cert = NULL;
480: k->ed25519_sk = NULL;
481: k->ed25519_pk = NULL;
1.62 markus 482: k->xmss_sk = NULL;
483: k->xmss_pk = NULL;
1.1 djm 484: switch (k->type) {
485: #ifdef WITH_OPENSSL
486: case KEY_RSA:
487: case KEY_RSA_CERT:
1.69 ! djm 488: if ((rsa = RSA_new()) == NULL) {
1.1 djm 489: free(k);
490: return NULL;
491: }
492: k->rsa = rsa;
493: break;
494: case KEY_DSA:
495: case KEY_DSA_CERT:
1.69 ! djm 496: if ((dsa = DSA_new()) == NULL) {
1.1 djm 497: free(k);
498: return NULL;
499: }
500: k->dsa = dsa;
501: break;
502: case KEY_ECDSA:
503: case KEY_ECDSA_CERT:
504: /* Cannot do anything until we know the group */
505: break;
506: #endif /* WITH_OPENSSL */
507: case KEY_ED25519:
508: case KEY_ED25519_CERT:
1.62 markus 509: case KEY_XMSS:
510: case KEY_XMSS_CERT:
1.1 djm 511: /* no need to prealloc */
512: break;
513: case KEY_UNSPEC:
514: break;
515: default:
516: free(k);
517: return NULL;
518: }
519:
520: if (sshkey_is_cert(k)) {
521: if ((k->cert = cert_new()) == NULL) {
522: sshkey_free(k);
523: return NULL;
524: }
525: }
526:
527: return k;
528: }
529:
1.69 ! djm 530: /* XXX garbage-collect this API */
1.1 djm 531: struct sshkey *
532: sshkey_new_private(int type)
533: {
534: struct sshkey *k = sshkey_new(type);
535:
536: if (k == NULL)
537: return NULL;
538: return k;
539: }
540:
541: void
542: sshkey_free(struct sshkey *k)
543: {
544: if (k == NULL)
545: return;
546: switch (k->type) {
547: #ifdef WITH_OPENSSL
548: case KEY_RSA:
549: case KEY_RSA_CERT:
1.60 jsing 550: RSA_free(k->rsa);
1.1 djm 551: k->rsa = NULL;
552: break;
553: case KEY_DSA:
554: case KEY_DSA_CERT:
1.60 jsing 555: DSA_free(k->dsa);
1.1 djm 556: k->dsa = NULL;
557: break;
558: case KEY_ECDSA:
559: case KEY_ECDSA_CERT:
1.60 jsing 560: EC_KEY_free(k->ecdsa);
1.1 djm 561: k->ecdsa = NULL;
562: break;
563: #endif /* WITH_OPENSSL */
564: case KEY_ED25519:
565: case KEY_ED25519_CERT:
1.61 jsing 566: freezero(k->ed25519_pk, ED25519_PK_SZ);
567: k->ed25519_pk = NULL;
568: freezero(k->ed25519_sk, ED25519_SK_SZ);
569: k->ed25519_sk = NULL;
1.1 djm 570: break;
1.62 markus 571: #ifdef WITH_XMSS
572: case KEY_XMSS:
573: case KEY_XMSS_CERT:
574: freezero(k->xmss_pk, sshkey_xmss_pklen(k));
575: k->xmss_pk = NULL;
576: freezero(k->xmss_sk, sshkey_xmss_sklen(k));
577: k->xmss_sk = NULL;
578: sshkey_xmss_free_state(k);
579: free(k->xmss_name);
580: k->xmss_name = NULL;
581: free(k->xmss_filename);
582: k->xmss_filename = NULL;
583: break;
584: #endif /* WITH_XMSS */
1.1 djm 585: case KEY_UNSPEC:
586: break;
587: default:
588: break;
589: }
590: if (sshkey_is_cert(k))
591: cert_free(k->cert);
1.61 jsing 592: freezero(k, sizeof(*k));
1.1 djm 593: }
594:
595: static int
596: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
597: {
598: if (a == NULL && b == NULL)
599: return 1;
600: if (a == NULL || b == NULL)
601: return 0;
602: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
603: return 0;
604: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
605: sshbuf_len(a->certblob)) != 0)
606: return 0;
607: return 1;
608: }
609:
610: /*
611: * Compare public portions of key only, allowing comparisons between
612: * certificates and plain keys too.
613: */
614: int
615: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
616: {
617: #ifdef WITH_OPENSSL
618: BN_CTX *bnctx;
1.69 ! djm 619: const BIGNUM *rsa_e_a, *rsa_n_a;
! 620: const BIGNUM *rsa_e_b, *rsa_n_b;
! 621: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
! 622: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 623: #endif /* WITH_OPENSSL */
624:
625: if (a == NULL || b == NULL ||
626: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
627: return 0;
628:
629: switch (a->type) {
630: #ifdef WITH_OPENSSL
631: case KEY_RSA_CERT:
632: case KEY_RSA:
1.69 ! djm 633: if (a->rsa == NULL || b->rsa == NULL)
! 634: return 0;
! 635: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
! 636: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
! 637: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
! 638: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 639: case KEY_DSA_CERT:
640: case KEY_DSA:
1.69 ! djm 641: if (a->dsa == NULL || b->dsa == NULL)
! 642: return 0;
! 643: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
! 644: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
! 645: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
! 646: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
! 647: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
! 648: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
! 649: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
! 650: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.1 djm 651: case KEY_ECDSA_CERT:
652: case KEY_ECDSA:
653: if (a->ecdsa == NULL || b->ecdsa == NULL ||
654: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
655: EC_KEY_get0_public_key(b->ecdsa) == NULL)
656: return 0;
657: if ((bnctx = BN_CTX_new()) == NULL)
658: return 0;
659: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
660: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
661: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
662: EC_KEY_get0_public_key(a->ecdsa),
663: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
664: BN_CTX_free(bnctx);
665: return 0;
666: }
667: BN_CTX_free(bnctx);
668: return 1;
669: #endif /* WITH_OPENSSL */
670: case KEY_ED25519:
671: case KEY_ED25519_CERT:
672: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
673: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 674: #ifdef WITH_XMSS
675: case KEY_XMSS:
676: case KEY_XMSS_CERT:
677: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
678: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
679: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
680: #endif /* WITH_XMSS */
1.1 djm 681: default:
682: return 0;
683: }
684: /* NOTREACHED */
685: }
686:
687: int
688: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
689: {
690: if (a == NULL || b == NULL || a->type != b->type)
691: return 0;
692: if (sshkey_is_cert(a)) {
693: if (!cert_compare(a->cert, b->cert))
694: return 0;
695: }
696: return sshkey_equal_public(a, b);
697: }
698:
699: static int
1.62 markus 700: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
701: enum sshkey_serialize_rep opts)
1.1 djm 702: {
703: int type, ret = SSH_ERR_INTERNAL_ERROR;
704: const char *typename;
1.69 ! djm 705: #ifdef WITH_OPENSSL
! 706: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
! 707: #endif /* WITH_OPENSSL */
1.1 djm 708:
709: if (key == NULL)
710: return SSH_ERR_INVALID_ARGUMENT;
711:
1.19 djm 712: if (sshkey_is_cert(key)) {
713: if (key->cert == NULL)
714: return SSH_ERR_EXPECTED_CERT;
715: if (sshbuf_len(key->cert->certblob) == 0)
716: return SSH_ERR_KEY_LACKS_CERTBLOB;
717: }
1.1 djm 718: type = force_plain ? sshkey_type_plain(key->type) : key->type;
719: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
720:
721: switch (type) {
722: #ifdef WITH_OPENSSL
723: case KEY_DSA_CERT:
724: case KEY_ECDSA_CERT:
725: case KEY_RSA_CERT:
726: #endif /* WITH_OPENSSL */
727: case KEY_ED25519_CERT:
1.62 markus 728: #ifdef WITH_XMSS
729: case KEY_XMSS_CERT:
730: #endif /* WITH_XMSS */
1.1 djm 731: /* Use the existing blob */
732: /* XXX modified flag? */
733: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
734: return ret;
735: break;
736: #ifdef WITH_OPENSSL
737: case KEY_DSA:
738: if (key->dsa == NULL)
739: return SSH_ERR_INVALID_ARGUMENT;
1.69 ! djm 740: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
! 741: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 742: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 ! djm 743: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
! 744: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
! 745: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
! 746: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 747: return ret;
748: break;
749: case KEY_ECDSA:
750: if (key->ecdsa == NULL)
751: return SSH_ERR_INVALID_ARGUMENT;
752: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
753: (ret = sshbuf_put_cstring(b,
754: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
755: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
756: return ret;
757: break;
758: case KEY_RSA:
759: if (key->rsa == NULL)
760: return SSH_ERR_INVALID_ARGUMENT;
1.69 ! djm 761: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 762: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 ! djm 763: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
! 764: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 765: return ret;
766: break;
767: #endif /* WITH_OPENSSL */
768: case KEY_ED25519:
769: if (key->ed25519_pk == NULL)
770: return SSH_ERR_INVALID_ARGUMENT;
771: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
772: (ret = sshbuf_put_string(b,
773: key->ed25519_pk, ED25519_PK_SZ)) != 0)
774: return ret;
775: break;
1.62 markus 776: #ifdef WITH_XMSS
777: case KEY_XMSS:
778: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
779: sshkey_xmss_pklen(key) == 0)
780: return SSH_ERR_INVALID_ARGUMENT;
781: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
782: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
783: (ret = sshbuf_put_string(b,
784: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
785: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
786: return ret;
787: break;
788: #endif /* WITH_XMSS */
1.1 djm 789: default:
790: return SSH_ERR_KEY_TYPE_UNKNOWN;
791: }
792: return 0;
793: }
794:
795: int
1.14 djm 796: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 797: {
1.62 markus 798: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 799: }
800:
801: int
1.62 markus 802: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
803: enum sshkey_serialize_rep opts)
1.14 djm 804: {
805: struct sshbuf *tmp;
806: int r;
807:
808: if ((tmp = sshbuf_new()) == NULL)
809: return SSH_ERR_ALLOC_FAIL;
1.62 markus 810: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 811: if (r == 0)
812: r = sshbuf_put_stringb(b, tmp);
813: sshbuf_free(tmp);
814: return r;
815: }
816:
817: int
1.62 markus 818: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
819: {
820: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
821: }
822:
823: int
1.14 djm 824: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 825: {
1.62 markus 826: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 827: }
828:
829: static int
1.62 markus 830: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
831: enum sshkey_serialize_rep opts)
1.1 djm 832: {
833: int ret = SSH_ERR_INTERNAL_ERROR;
834: size_t len;
835: struct sshbuf *b = NULL;
836:
837: if (lenp != NULL)
838: *lenp = 0;
839: if (blobp != NULL)
840: *blobp = NULL;
841: if ((b = sshbuf_new()) == NULL)
842: return SSH_ERR_ALLOC_FAIL;
1.62 markus 843: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 844: goto out;
845: len = sshbuf_len(b);
846: if (lenp != NULL)
847: *lenp = len;
848: if (blobp != NULL) {
849: if ((*blobp = malloc(len)) == NULL) {
850: ret = SSH_ERR_ALLOC_FAIL;
851: goto out;
852: }
853: memcpy(*blobp, sshbuf_ptr(b), len);
854: }
855: ret = 0;
856: out:
857: sshbuf_free(b);
858: return ret;
859: }
860:
861: int
862: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
863: {
1.62 markus 864: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 865: }
866:
867: int
868: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
869: {
1.62 markus 870: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 871: }
872:
873: int
1.7 djm 874: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 875: u_char **retp, size_t *lenp)
876: {
877: u_char *blob = NULL, *ret = NULL;
878: size_t blob_len = 0;
1.7 djm 879: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 880:
881: if (retp != NULL)
882: *retp = NULL;
883: if (lenp != NULL)
884: *lenp = 0;
1.7 djm 885: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 886: r = SSH_ERR_INVALID_ARGUMENT;
887: goto out;
888: }
1.62 markus 889: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
890: != 0)
1.1 djm 891: goto out;
892: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
893: r = SSH_ERR_ALLOC_FAIL;
894: goto out;
895: }
1.7 djm 896: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 897: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
898: goto out;
899: /* success */
900: if (retp != NULL) {
901: *retp = ret;
902: ret = NULL;
903: }
904: if (lenp != NULL)
1.7 djm 905: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 906: r = 0;
907: out:
908: free(ret);
909: if (blob != NULL) {
910: explicit_bzero(blob, blob_len);
911: free(blob);
912: }
913: return r;
914: }
915:
916: static char *
1.7 djm 917: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
918: {
919: char *ret;
920: size_t plen = strlen(alg) + 1;
921: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
922: int r;
923:
924: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
925: return NULL;
926: strlcpy(ret, alg, rlen);
927: strlcat(ret, ":", rlen);
928: if (dgst_raw_len == 0)
929: return ret;
930: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
931: ret + plen, rlen - plen)) == -1) {
1.61 jsing 932: freezero(ret, rlen);
1.7 djm 933: return NULL;
934: }
935: /* Trim padding characters from end */
936: ret[strcspn(ret, "=")] = '\0';
937: return ret;
938: }
939:
940: static char *
941: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 942: {
1.7 djm 943: char *retval, hex[5];
944: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 945:
1.7 djm 946: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 947: return NULL;
1.7 djm 948: strlcpy(retval, alg, rlen);
949: strlcat(retval, ":", rlen);
1.1 djm 950: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 951: snprintf(hex, sizeof(hex), "%s%02x",
952: i > 0 ? ":" : "", dgst_raw[i]);
953: strlcat(retval, hex, rlen);
1.1 djm 954: }
955: return retval;
956: }
957:
958: static char *
959: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
960: {
961: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
962: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
963: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
964: u_int i, j = 0, rounds, seed = 1;
965: char *retval;
966:
967: rounds = (dgst_raw_len / 2) + 1;
968: if ((retval = calloc(rounds, 6)) == NULL)
969: return NULL;
970: retval[j++] = 'x';
971: for (i = 0; i < rounds; i++) {
972: u_int idx0, idx1, idx2, idx3, idx4;
973: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
974: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
975: seed) % 6;
976: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
977: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
978: (seed / 6)) % 6;
979: retval[j++] = vowels[idx0];
980: retval[j++] = consonants[idx1];
981: retval[j++] = vowels[idx2];
982: if ((i + 1) < rounds) {
983: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
984: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
985: retval[j++] = consonants[idx3];
986: retval[j++] = '-';
987: retval[j++] = consonants[idx4];
988: seed = ((seed * 5) +
989: ((((u_int)(dgst_raw[2 * i])) * 7) +
990: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
991: }
992: } else {
993: idx0 = seed % 6;
994: idx1 = 16;
995: idx2 = seed / 6;
996: retval[j++] = vowels[idx0];
997: retval[j++] = consonants[idx1];
998: retval[j++] = vowels[idx2];
999: }
1000: }
1001: retval[j++] = 'x';
1002: retval[j++] = '\0';
1003: return retval;
1004: }
1005:
1006: /*
1007: * Draw an ASCII-Art representing the fingerprint so human brain can
1008: * profit from its built-in pattern recognition ability.
1009: * This technique is called "random art" and can be found in some
1010: * scientific publications like this original paper:
1011: *
1012: * "Hash Visualization: a New Technique to improve Real-World Security",
1013: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1014: * Techniques and E-Commerce (CrypTEC '99)
1015: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1016: *
1017: * The subject came up in a talk by Dan Kaminsky, too.
1018: *
1019: * If you see the picture is different, the key is different.
1020: * If the picture looks the same, you still know nothing.
1021: *
1022: * The algorithm used here is a worm crawling over a discrete plane,
1023: * leaving a trace (augmenting the field) everywhere it goes.
1024: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1025: * makes the respective movement vector be ignored for this turn.
1026: * Graphs are not unambiguous, because circles in graphs can be
1027: * walked in either direction.
1028: */
1029:
1030: /*
1031: * Field sizes for the random art. Have to be odd, so the starting point
1032: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1033: * Else pictures would be too dense, and drawing the frame would
1034: * fail, too, because the key type would not fit in anymore.
1035: */
1036: #define FLDBASE 8
1037: #define FLDSIZE_Y (FLDBASE + 1)
1038: #define FLDSIZE_X (FLDBASE * 2 + 1)
1039: static char *
1.7 djm 1040: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1041: const struct sshkey *k)
1042: {
1043: /*
1044: * Chars to be used after each other every time the worm
1045: * intersects with itself. Matter of taste.
1046: */
1047: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1048: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1049: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1050: size_t i, tlen, hlen;
1.1 djm 1051: u_int b;
1.3 djm 1052: int x, y, r;
1.1 djm 1053: size_t len = strlen(augmentation_string) - 1;
1054:
1055: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1056: return NULL;
1057:
1058: /* initialize field */
1059: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1060: x = FLDSIZE_X / 2;
1061: y = FLDSIZE_Y / 2;
1062:
1063: /* process raw key */
1064: for (i = 0; i < dgst_raw_len; i++) {
1065: int input;
1066: /* each byte conveys four 2-bit move commands */
1067: input = dgst_raw[i];
1068: for (b = 0; b < 4; b++) {
1069: /* evaluate 2 bit, rest is shifted later */
1070: x += (input & 0x1) ? 1 : -1;
1071: y += (input & 0x2) ? 1 : -1;
1072:
1073: /* assure we are still in bounds */
1.37 deraadt 1074: x = MAXIMUM(x, 0);
1075: y = MAXIMUM(y, 0);
1076: x = MINIMUM(x, FLDSIZE_X - 1);
1077: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1078:
1079: /* augment the field */
1080: if (field[x][y] < len - 2)
1081: field[x][y]++;
1082: input = input >> 2;
1083: }
1084: }
1085:
1086: /* mark starting point and end point*/
1087: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1088: field[x][y] = len;
1089:
1.3 djm 1090: /* assemble title */
1091: r = snprintf(title, sizeof(title), "[%s %u]",
1092: sshkey_type(k), sshkey_size(k));
1093: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1094: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1095: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1096: tlen = (r <= 0) ? 0 : strlen(title);
1097:
1098: /* assemble hash ID. */
1099: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1100: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1101:
1102: /* output upper border */
1.3 djm 1103: p = retval;
1104: *p++ = '+';
1105: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1106: *p++ = '-';
1107: memcpy(p, title, tlen);
1108: p += tlen;
1.7 djm 1109: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1110: *p++ = '-';
1111: *p++ = '+';
1112: *p++ = '\n';
1113:
1114: /* output content */
1115: for (y = 0; y < FLDSIZE_Y; y++) {
1116: *p++ = '|';
1117: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1118: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1119: *p++ = '|';
1120: *p++ = '\n';
1121: }
1122:
1123: /* output lower border */
1124: *p++ = '+';
1.7 djm 1125: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1126: *p++ = '-';
1127: memcpy(p, hash, hlen);
1128: p += hlen;
1129: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1130: *p++ = '-';
1131: *p++ = '+';
1132:
1133: return retval;
1134: }
1135:
1136: char *
1.7 djm 1137: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1138: enum sshkey_fp_rep dgst_rep)
1139: {
1140: char *retval = NULL;
1141: u_char *dgst_raw;
1142: size_t dgst_raw_len;
1143:
1.7 djm 1144: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1145: return NULL;
1146: switch (dgst_rep) {
1.7 djm 1147: case SSH_FP_DEFAULT:
1148: if (dgst_alg == SSH_DIGEST_MD5) {
1149: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1150: dgst_raw, dgst_raw_len);
1151: } else {
1152: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1153: dgst_raw, dgst_raw_len);
1154: }
1155: break;
1.1 djm 1156: case SSH_FP_HEX:
1.7 djm 1157: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1158: dgst_raw, dgst_raw_len);
1159: break;
1160: case SSH_FP_BASE64:
1161: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1162: dgst_raw, dgst_raw_len);
1.1 djm 1163: break;
1164: case SSH_FP_BUBBLEBABBLE:
1165: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1166: break;
1167: case SSH_FP_RANDOMART:
1.7 djm 1168: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1169: dgst_raw, dgst_raw_len, k);
1.1 djm 1170: break;
1171: default:
1172: explicit_bzero(dgst_raw, dgst_raw_len);
1173: free(dgst_raw);
1174: return NULL;
1175: }
1176: explicit_bzero(dgst_raw, dgst_raw_len);
1177: free(dgst_raw);
1178: return retval;
1179: }
1180:
1.63 djm 1181: static int
1182: peek_type_nid(const char *s, size_t l, int *nid)
1183: {
1184: const struct keytype *kt;
1185:
1186: for (kt = keytypes; kt->type != -1; kt++) {
1187: if (kt->name == NULL || strlen(kt->name) != l)
1188: continue;
1189: if (memcmp(s, kt->name, l) == 0) {
1190: *nid = -1;
1191: if (kt->type == KEY_ECDSA || kt->type == KEY_ECDSA_CERT)
1192: *nid = kt->nid;
1193: return kt->type;
1194: }
1195: }
1196: return KEY_UNSPEC;
1197: }
1198:
1.1 djm 1199:
1.63 djm 1200: /* XXX this can now be made const char * */
1.1 djm 1201: int
1202: sshkey_read(struct sshkey *ret, char **cpp)
1203: {
1204: struct sshkey *k;
1.63 djm 1205: char *cp, *blobcopy;
1206: size_t space;
1.1 djm 1207: int r, type, curve_nid = -1;
1208: struct sshbuf *blob;
1.44 dtucker 1209:
1210: if (ret == NULL)
1211: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1212:
1213: switch (ret->type) {
1214: case KEY_UNSPEC:
1215: case KEY_RSA:
1216: case KEY_DSA:
1217: case KEY_ECDSA:
1218: case KEY_ED25519:
1219: case KEY_DSA_CERT:
1220: case KEY_ECDSA_CERT:
1221: case KEY_RSA_CERT:
1222: case KEY_ED25519_CERT:
1.62 markus 1223: #ifdef WITH_XMSS
1224: case KEY_XMSS:
1225: case KEY_XMSS_CERT:
1226: #endif /* WITH_XMSS */
1.63 djm 1227: break; /* ok */
1228: default:
1229: return SSH_ERR_INVALID_ARGUMENT;
1230: }
1231:
1232: /* Decode type */
1233: cp = *cpp;
1234: space = strcspn(cp, " \t");
1235: if (space == strlen(cp))
1236: return SSH_ERR_INVALID_FORMAT;
1237: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1238: return SSH_ERR_INVALID_FORMAT;
1239:
1240: /* skip whitespace */
1241: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1242: ;
1243: if (*cp == '\0')
1244: return SSH_ERR_INVALID_FORMAT;
1245: if (ret->type != KEY_UNSPEC && ret->type != type)
1246: return SSH_ERR_KEY_TYPE_MISMATCH;
1247: if ((blob = sshbuf_new()) == NULL)
1248: return SSH_ERR_ALLOC_FAIL;
1249:
1250: /* find end of keyblob and decode */
1251: space = strcspn(cp, " \t");
1252: if ((blobcopy = strndup(cp, space)) == NULL) {
1253: sshbuf_free(blob);
1254: return SSH_ERR_ALLOC_FAIL;
1255: }
1256: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1257: free(blobcopy);
1258: sshbuf_free(blob);
1259: return r;
1260: }
1261: free(blobcopy);
1262: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1263: sshbuf_free(blob);
1.63 djm 1264: return r;
1265: }
1266: sshbuf_free(blob);
1267:
1268: /* skip whitespace and leave cp at start of comment */
1269: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1270: ;
1271:
1272: /* ensure type of blob matches type at start of line */
1273: if (k->type != type) {
1274: sshkey_free(k);
1275: return SSH_ERR_KEY_TYPE_MISMATCH;
1276: }
1277: if (sshkey_type_plain(type) == KEY_ECDSA && curve_nid != k->ecdsa_nid) {
1278: sshkey_free(k);
1279: return SSH_ERR_EC_CURVE_MISMATCH;
1280: }
1281:
1282: /* Fill in ret from parsed key */
1283: ret->type = type;
1284: if (sshkey_is_cert(ret)) {
1285: if (!sshkey_is_cert(k)) {
1.1 djm 1286: sshkey_free(k);
1.63 djm 1287: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1288: }
1.63 djm 1289: if (ret->cert != NULL)
1290: cert_free(ret->cert);
1291: ret->cert = k->cert;
1292: k->cert = NULL;
1293: }
1294: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1295: #ifdef WITH_OPENSSL
1.63 djm 1296: case KEY_RSA:
1297: RSA_free(ret->rsa);
1298: ret->rsa = k->rsa;
1299: k->rsa = NULL;
1.1 djm 1300: #ifdef DEBUG_PK
1.63 djm 1301: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1302: #endif
1.63 djm 1303: break;
1304: case KEY_DSA:
1305: DSA_free(ret->dsa);
1306: ret->dsa = k->dsa;
1307: k->dsa = NULL;
1.1 djm 1308: #ifdef DEBUG_PK
1.63 djm 1309: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1310: #endif
1.63 djm 1311: break;
1312: case KEY_ECDSA:
1313: EC_KEY_free(ret->ecdsa);
1314: ret->ecdsa = k->ecdsa;
1315: ret->ecdsa_nid = k->ecdsa_nid;
1316: k->ecdsa = NULL;
1317: k->ecdsa_nid = -1;
1.1 djm 1318: #ifdef DEBUG_PK
1.63 djm 1319: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1320: #endif
1.63 djm 1321: break;
1.1 djm 1322: #endif /* WITH_OPENSSL */
1.63 djm 1323: case KEY_ED25519:
1324: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1325: ret->ed25519_pk = k->ed25519_pk;
1326: k->ed25519_pk = NULL;
1.1 djm 1327: #ifdef DEBUG_PK
1.63 djm 1328: /* XXX */
1.1 djm 1329: #endif
1.63 djm 1330: break;
1.62 markus 1331: #ifdef WITH_XMSS
1.63 djm 1332: case KEY_XMSS:
1333: free(ret->xmss_pk);
1334: ret->xmss_pk = k->xmss_pk;
1335: k->xmss_pk = NULL;
1336: free(ret->xmss_state);
1337: ret->xmss_state = k->xmss_state;
1338: k->xmss_state = NULL;
1339: free(ret->xmss_name);
1340: ret->xmss_name = k->xmss_name;
1341: k->xmss_name = NULL;
1342: free(ret->xmss_filename);
1343: ret->xmss_filename = k->xmss_filename;
1344: k->xmss_filename = NULL;
1.62 markus 1345: #ifdef DEBUG_PK
1.63 djm 1346: /* XXX */
1.62 markus 1347: #endif
1.63 djm 1348: break;
1.62 markus 1349: #endif /* WITH_XMSS */
1.63 djm 1350: default:
1.1 djm 1351: sshkey_free(k);
1.63 djm 1352: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1353: }
1.63 djm 1354: sshkey_free(k);
1355:
1356: /* success */
1357: *cpp = cp;
1358: return 0;
1.1 djm 1359: }
1360:
1361: int
1.19 djm 1362: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1363: {
1.19 djm 1364: int r = SSH_ERR_INTERNAL_ERROR;
1365: struct sshbuf *b = NULL;
1.1 djm 1366: char *uu = NULL;
1.19 djm 1367:
1368: if (b64p != NULL)
1369: *b64p = NULL;
1370: if ((b = sshbuf_new()) == NULL)
1371: return SSH_ERR_ALLOC_FAIL;
1372: if ((r = sshkey_putb(key, b)) != 0)
1373: goto out;
1374: if ((uu = sshbuf_dtob64(b)) == NULL) {
1375: r = SSH_ERR_ALLOC_FAIL;
1376: goto out;
1377: }
1378: /* Success */
1379: if (b64p != NULL) {
1380: *b64p = uu;
1381: uu = NULL;
1382: }
1383: r = 0;
1384: out:
1385: sshbuf_free(b);
1386: free(uu);
1387: return r;
1388: }
1389:
1.52 djm 1390: int
1.19 djm 1391: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1392: {
1393: int r = SSH_ERR_INTERNAL_ERROR;
1394: char *uu = NULL;
1395:
1.48 djm 1396: if ((r = sshkey_to_base64(key, &uu)) != 0)
1397: goto out;
1398: if ((r = sshbuf_putf(b, "%s %s",
1399: sshkey_ssh_name(key), uu)) != 0)
1400: goto out;
1.19 djm 1401: r = 0;
1402: out:
1403: free(uu);
1404: return r;
1405: }
1406:
1407: int
1408: sshkey_write(const struct sshkey *key, FILE *f)
1409: {
1410: struct sshbuf *b = NULL;
1411: int r = SSH_ERR_INTERNAL_ERROR;
1412:
1413: if ((b = sshbuf_new()) == NULL)
1414: return SSH_ERR_ALLOC_FAIL;
1415: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1416: goto out;
1417: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1418: if (feof(f))
1419: errno = EPIPE;
1.19 djm 1420: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1421: goto out;
1422: }
1.19 djm 1423: /* Success */
1424: r = 0;
1.1 djm 1425: out:
1.19 djm 1426: sshbuf_free(b);
1427: return r;
1.1 djm 1428: }
1429:
1430: const char *
1431: sshkey_cert_type(const struct sshkey *k)
1432: {
1433: switch (k->cert->type) {
1434: case SSH2_CERT_TYPE_USER:
1435: return "user";
1436: case SSH2_CERT_TYPE_HOST:
1437: return "host";
1438: default:
1439: return "unknown";
1440: }
1441: }
1442:
1443: #ifdef WITH_OPENSSL
1444: static int
1445: rsa_generate_private_key(u_int bits, RSA **rsap)
1446: {
1447: RSA *private = NULL;
1448: BIGNUM *f4 = NULL;
1449: int ret = SSH_ERR_INTERNAL_ERROR;
1450:
1.49 djm 1451: if (rsap == NULL)
1452: return SSH_ERR_INVALID_ARGUMENT;
1453: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1454: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1455: return SSH_ERR_KEY_LENGTH;
1.1 djm 1456: *rsap = NULL;
1457: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1458: ret = SSH_ERR_ALLOC_FAIL;
1459: goto out;
1460: }
1461: if (!BN_set_word(f4, RSA_F4) ||
1462: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1463: ret = SSH_ERR_LIBCRYPTO_ERROR;
1464: goto out;
1465: }
1466: *rsap = private;
1467: private = NULL;
1468: ret = 0;
1469: out:
1.60 jsing 1470: RSA_free(private);
1471: BN_free(f4);
1.1 djm 1472: return ret;
1473: }
1474:
1475: static int
1476: dsa_generate_private_key(u_int bits, DSA **dsap)
1477: {
1478: DSA *private;
1479: int ret = SSH_ERR_INTERNAL_ERROR;
1480:
1.49 djm 1481: if (dsap == NULL)
1.1 djm 1482: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1483: if (bits != 1024)
1484: return SSH_ERR_KEY_LENGTH;
1.1 djm 1485: if ((private = DSA_new()) == NULL) {
1486: ret = SSH_ERR_ALLOC_FAIL;
1487: goto out;
1488: }
1489: *dsap = NULL;
1490: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1491: NULL, NULL) || !DSA_generate_key(private)) {
1492: ret = SSH_ERR_LIBCRYPTO_ERROR;
1493: goto out;
1494: }
1495: *dsap = private;
1496: private = NULL;
1497: ret = 0;
1498: out:
1.60 jsing 1499: DSA_free(private);
1.1 djm 1500: return ret;
1501: }
1502:
1503: int
1504: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1505: {
1506: EC_GROUP *eg;
1507: int nids[] = {
1508: NID_X9_62_prime256v1,
1509: NID_secp384r1,
1510: NID_secp521r1,
1511: -1
1512: };
1513: int nid;
1514: u_int i;
1515: BN_CTX *bnctx;
1516: const EC_GROUP *g = EC_KEY_get0_group(k);
1517:
1518: /*
1519: * The group may be stored in a ASN.1 encoded private key in one of two
1520: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1521: * or explicit group parameters encoded into the key blob. Only the
1522: * "named group" case sets the group NID for us, but we can figure
1523: * it out for the other case by comparing against all the groups that
1524: * are supported.
1525: */
1526: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1527: return nid;
1528: if ((bnctx = BN_CTX_new()) == NULL)
1529: return -1;
1530: for (i = 0; nids[i] != -1; i++) {
1531: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1532: BN_CTX_free(bnctx);
1533: return -1;
1534: }
1535: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1536: break;
1537: EC_GROUP_free(eg);
1538: }
1539: BN_CTX_free(bnctx);
1540: if (nids[i] != -1) {
1541: /* Use the group with the NID attached */
1542: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1543: if (EC_KEY_set_group(k, eg) != 1) {
1544: EC_GROUP_free(eg);
1545: return -1;
1546: }
1547: }
1548: return nids[i];
1549: }
1550:
1551: static int
1552: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1553: {
1554: EC_KEY *private;
1555: int ret = SSH_ERR_INTERNAL_ERROR;
1556:
1.50 djm 1557: if (nid == NULL || ecdsap == NULL)
1.1 djm 1558: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1559: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1560: return SSH_ERR_KEY_LENGTH;
1.1 djm 1561: *ecdsap = NULL;
1562: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1563: ret = SSH_ERR_ALLOC_FAIL;
1564: goto out;
1565: }
1566: if (EC_KEY_generate_key(private) != 1) {
1567: ret = SSH_ERR_LIBCRYPTO_ERROR;
1568: goto out;
1569: }
1570: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1571: *ecdsap = private;
1572: private = NULL;
1573: ret = 0;
1574: out:
1.60 jsing 1575: EC_KEY_free(private);
1.1 djm 1576: return ret;
1577: }
1578: #endif /* WITH_OPENSSL */
1579:
1580: int
1581: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1582: {
1583: struct sshkey *k;
1584: int ret = SSH_ERR_INTERNAL_ERROR;
1585:
1586: if (keyp == NULL)
1587: return SSH_ERR_INVALID_ARGUMENT;
1588: *keyp = NULL;
1589: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1590: return SSH_ERR_ALLOC_FAIL;
1591: switch (type) {
1592: case KEY_ED25519:
1593: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1594: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1595: ret = SSH_ERR_ALLOC_FAIL;
1596: break;
1597: }
1598: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1599: ret = 0;
1600: break;
1.62 markus 1601: #ifdef WITH_XMSS
1602: case KEY_XMSS:
1603: ret = sshkey_xmss_generate_private_key(k, bits);
1604: break;
1605: #endif /* WITH_XMSS */
1.1 djm 1606: #ifdef WITH_OPENSSL
1607: case KEY_DSA:
1608: ret = dsa_generate_private_key(bits, &k->dsa);
1609: break;
1610: case KEY_ECDSA:
1611: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1612: &k->ecdsa);
1613: break;
1614: case KEY_RSA:
1615: ret = rsa_generate_private_key(bits, &k->rsa);
1616: break;
1617: #endif /* WITH_OPENSSL */
1618: default:
1619: ret = SSH_ERR_INVALID_ARGUMENT;
1620: }
1621: if (ret == 0) {
1622: k->type = type;
1623: *keyp = k;
1624: } else
1625: sshkey_free(k);
1626: return ret;
1627: }
1628:
1629: int
1630: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1631: {
1632: u_int i;
1633: const struct sshkey_cert *from;
1634: struct sshkey_cert *to;
1.67 djm 1635: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1636:
1.67 djm 1637: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1638: return SSH_ERR_INVALID_ARGUMENT;
1639:
1.67 djm 1640: if ((to = cert_new()) == NULL)
1.1 djm 1641: return SSH_ERR_ALLOC_FAIL;
1642:
1.67 djm 1643: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1644: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1645: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1646: goto out;
1.1 djm 1647:
1648: to->serial = from->serial;
1649: to->type = from->type;
1650: if (from->key_id == NULL)
1651: to->key_id = NULL;
1.67 djm 1652: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1653: r = SSH_ERR_ALLOC_FAIL;
1654: goto out;
1655: }
1.1 djm 1656: to->valid_after = from->valid_after;
1657: to->valid_before = from->valid_before;
1658: if (from->signature_key == NULL)
1659: to->signature_key = NULL;
1.67 djm 1660: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1661: &to->signature_key)) != 0)
1.67 djm 1662: goto out;
1663: if (from->signature_type != NULL &&
1664: (to->signature_type = strdup(from->signature_type)) == NULL) {
1665: r = SSH_ERR_ALLOC_FAIL;
1666: goto out;
1667: }
1668: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1669: r = SSH_ERR_INVALID_ARGUMENT;
1670: goto out;
1671: }
1.1 djm 1672: if (from->nprincipals > 0) {
1673: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1674: sizeof(*to->principals))) == NULL) {
1675: r = SSH_ERR_ALLOC_FAIL;
1676: goto out;
1677: }
1.1 djm 1678: for (i = 0; i < from->nprincipals; i++) {
1679: to->principals[i] = strdup(from->principals[i]);
1680: if (to->principals[i] == NULL) {
1681: to->nprincipals = i;
1.67 djm 1682: r = SSH_ERR_ALLOC_FAIL;
1683: goto out;
1.1 djm 1684: }
1685: }
1686: }
1687: to->nprincipals = from->nprincipals;
1.67 djm 1688:
1689: /* success */
1690: cert_free(to_key->cert);
1691: to_key->cert = to;
1692: to = NULL;
1693: r = 0;
1694: out:
1695: cert_free(to);
1696: return r;
1.1 djm 1697: }
1698:
1699: int
1700: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1701: {
1702: struct sshkey *n = NULL;
1.69 ! djm 1703: int r = SSH_ERR_INTERNAL_ERROR;
! 1704: #ifdef WITH_OPENSSL
! 1705: const BIGNUM *rsa_n, *rsa_e;
! 1706: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
! 1707: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
! 1708: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
! 1709: BIGNUM *dsa_pub_key_dup = NULL;
! 1710: #endif /* WITH_OPENSSL */
1.1 djm 1711:
1.24 djm 1712: *pkp = NULL;
1.1 djm 1713: switch (k->type) {
1714: #ifdef WITH_OPENSSL
1715: case KEY_DSA:
1716: case KEY_DSA_CERT:
1.69 ! djm 1717: if ((n = sshkey_new(k->type)) == NULL) {
! 1718: r = SSH_ERR_ALLOC_FAIL;
! 1719: goto out;
! 1720: }
! 1721:
! 1722: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
! 1723: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
! 1724: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
! 1725: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
! 1726: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
! 1727: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
! 1728: r = SSH_ERR_ALLOC_FAIL;
! 1729: goto out;
! 1730: }
! 1731: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
! 1732: r = SSH_ERR_LIBCRYPTO_ERROR;
! 1733: goto out;
1.1 djm 1734: }
1.69 ! djm 1735: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
! 1736: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
! 1737: r = SSH_ERR_LIBCRYPTO_ERROR;
! 1738: goto out;
! 1739: }
! 1740: dsa_pub_key_dup = NULL; /* transferred */
! 1741:
1.1 djm 1742: break;
1743: case KEY_ECDSA:
1744: case KEY_ECDSA_CERT:
1.69 ! djm 1745: if ((n = sshkey_new(k->type)) == NULL) {
! 1746: r = SSH_ERR_ALLOC_FAIL;
! 1747: goto out;
! 1748: }
1.1 djm 1749: n->ecdsa_nid = k->ecdsa_nid;
1750: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1751: if (n->ecdsa == NULL) {
1.69 ! djm 1752: r = SSH_ERR_ALLOC_FAIL;
! 1753: goto out;
1.1 djm 1754: }
1755: if (EC_KEY_set_public_key(n->ecdsa,
1756: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 ! djm 1757: r = SSH_ERR_LIBCRYPTO_ERROR;
! 1758: goto out;
1.1 djm 1759: }
1760: break;
1761: case KEY_RSA:
1762: case KEY_RSA_CERT:
1.69 ! djm 1763: if ((n = sshkey_new(k->type)) == NULL) {
! 1764: r = SSH_ERR_ALLOC_FAIL;
! 1765: goto out;
1.1 djm 1766: }
1.69 ! djm 1767: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
! 1768: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
! 1769: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
! 1770: r = SSH_ERR_ALLOC_FAIL;
! 1771: goto out;
! 1772: }
! 1773: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
! 1774: r = SSH_ERR_LIBCRYPTO_ERROR;
! 1775: goto out;
! 1776: }
! 1777: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1778: break;
1779: #endif /* WITH_OPENSSL */
1780: case KEY_ED25519:
1781: case KEY_ED25519_CERT:
1.69 ! djm 1782: if ((n = sshkey_new(k->type)) == NULL) {
! 1783: r = SSH_ERR_ALLOC_FAIL;
! 1784: goto out;
! 1785: }
1.1 djm 1786: if (k->ed25519_pk != NULL) {
1787: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 ! djm 1788: r = SSH_ERR_ALLOC_FAIL;
! 1789: goto out;
1.1 djm 1790: }
1791: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1792: }
1793: break;
1.62 markus 1794: #ifdef WITH_XMSS
1795: case KEY_XMSS:
1796: case KEY_XMSS_CERT:
1.69 ! djm 1797: if ((n = sshkey_new(k->type)) == NULL) {
! 1798: r = SSH_ERR_ALLOC_FAIL;
! 1799: goto out;
1.62 markus 1800: }
1.69 ! djm 1801: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
! 1802: goto out;
1.62 markus 1803: if (k->xmss_pk != NULL) {
1804: size_t pklen = sshkey_xmss_pklen(k);
1805: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 ! djm 1806: r = SSH_ERR_INTERNAL_ERROR;
! 1807: goto out;
1.62 markus 1808: }
1809: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 ! djm 1810: r = SSH_ERR_ALLOC_FAIL;
! 1811: goto out;
1.62 markus 1812: }
1813: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1814: }
1815: break;
1816: #endif /* WITH_XMSS */
1.1 djm 1817: default:
1.69 ! djm 1818: r = SSH_ERR_KEY_TYPE_UNKNOWN;
! 1819: goto out;
1.1 djm 1820: }
1.69 ! djm 1821: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
! 1822: goto out;
! 1823: /* success */
1.1 djm 1824: *pkp = n;
1.69 ! djm 1825: n = NULL;
! 1826: r = 0;
! 1827: out:
! 1828: sshkey_free(n);
! 1829: BN_clear_free(rsa_n_dup);
! 1830: BN_clear_free(rsa_e_dup);
! 1831: BN_clear_free(dsa_p_dup);
! 1832: BN_clear_free(dsa_q_dup);
! 1833: BN_clear_free(dsa_g_dup);
! 1834: BN_clear_free(dsa_pub_key_dup);
! 1835:
! 1836: return r;
1.1 djm 1837: }
1838:
1839: static int
1.14 djm 1840: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1841: {
1.14 djm 1842: struct sshbuf *principals = NULL, *crit = NULL;
1843: struct sshbuf *exts = NULL, *ca = NULL;
1844: u_char *sig = NULL;
1845: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1846: int ret = SSH_ERR_INTERNAL_ERROR;
1847:
1848: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1849: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1850: return ret;
1851:
1.20 djm 1852: /* Parse body of certificate up to signature */
1853: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1854: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1855: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1856: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1857: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1858: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1859: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1860: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1861: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1862: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1863: /* XXX debug print error for ret */
1864: ret = SSH_ERR_INVALID_FORMAT;
1865: goto out;
1866: }
1867:
1868: /* Signature is left in the buffer so we can calculate this length */
1869: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1870:
1871: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1872: ret = SSH_ERR_INVALID_FORMAT;
1873: goto out;
1874: }
1875:
1876: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1877: key->cert->type != SSH2_CERT_TYPE_HOST) {
1878: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1879: goto out;
1880: }
1881:
1.4 djm 1882: /* Parse principals section */
1883: while (sshbuf_len(principals) > 0) {
1884: char *principal = NULL;
1885: char **oprincipals = NULL;
1886:
1.1 djm 1887: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1888: ret = SSH_ERR_INVALID_FORMAT;
1889: goto out;
1890: }
1.4 djm 1891: if ((ret = sshbuf_get_cstring(principals, &principal,
1892: NULL)) != 0) {
1.1 djm 1893: ret = SSH_ERR_INVALID_FORMAT;
1894: goto out;
1895: }
1896: oprincipals = key->cert->principals;
1.51 deraadt 1897: key->cert->principals = recallocarray(key->cert->principals,
1898: key->cert->nprincipals, key->cert->nprincipals + 1,
1899: sizeof(*key->cert->principals));
1.1 djm 1900: if (key->cert->principals == NULL) {
1901: free(principal);
1902: key->cert->principals = oprincipals;
1903: ret = SSH_ERR_ALLOC_FAIL;
1904: goto out;
1905: }
1906: key->cert->principals[key->cert->nprincipals++] = principal;
1907: }
1908:
1.4 djm 1909: /*
1910: * Stash a copies of the critical options and extensions sections
1911: * for later use.
1912: */
1913: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1914: (exts != NULL &&
1915: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1916: goto out;
1917:
1.4 djm 1918: /*
1919: * Validate critical options and extensions sections format.
1920: */
1921: while (sshbuf_len(crit) != 0) {
1922: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1923: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1924: sshbuf_reset(key->cert->critical);
1.1 djm 1925: ret = SSH_ERR_INVALID_FORMAT;
1926: goto out;
1927: }
1928: }
1.4 djm 1929: while (exts != NULL && sshbuf_len(exts) != 0) {
1930: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1931: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1932: sshbuf_reset(key->cert->extensions);
1.1 djm 1933: ret = SSH_ERR_INVALID_FORMAT;
1934: goto out;
1935: }
1936: }
1937:
1.4 djm 1938: /* Parse CA key and check signature */
1.14 djm 1939: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1940: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1941: goto out;
1942: }
1943: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1944: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1945: goto out;
1946: }
1947: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 1948: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 1949: goto out;
1.67 djm 1950: if ((ret = get_sigtype(sig, slen, &key->cert->signature_type)) != 0)
1951: goto out;
1.4 djm 1952:
1953: /* Success */
1.1 djm 1954: ret = 0;
1955: out:
1.14 djm 1956: sshbuf_free(ca);
1.4 djm 1957: sshbuf_free(crit);
1958: sshbuf_free(exts);
1959: sshbuf_free(principals);
1.1 djm 1960: free(sig);
1961: return ret;
1962: }
1963:
1964: static int
1.69 ! djm 1965: check_rsa_length(const RSA *rsa)
! 1966: {
! 1967: const BIGNUM *rsa_n;
! 1968:
! 1969: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
! 1970: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
! 1971: return SSH_ERR_KEY_LENGTH;
! 1972: return 0;
! 1973: }
! 1974:
! 1975: static int
1.14 djm 1976: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1977: int allow_cert)
1.1 djm 1978: {
1.12 djm 1979: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 1980: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 1981: struct sshkey *key = NULL;
1982: size_t len;
1983: u_char *pk = NULL;
1.14 djm 1984: struct sshbuf *copy;
1.1 djm 1985: #ifdef WITH_OPENSSL
1986: EC_POINT *q = NULL;
1.69 ! djm 1987: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
! 1988: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 1989: #endif /* WITH_OPENSSL */
1990:
1991: #ifdef DEBUG_PK /* XXX */
1.14 djm 1992: sshbuf_dump(b, stderr);
1.1 djm 1993: #endif
1.32 djm 1994: if (keyp != NULL)
1995: *keyp = NULL;
1.14 djm 1996: if ((copy = sshbuf_fromb(b)) == NULL) {
1997: ret = SSH_ERR_ALLOC_FAIL;
1998: goto out;
1999: }
1.1 djm 2000: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
2001: ret = SSH_ERR_INVALID_FORMAT;
2002: goto out;
2003: }
2004:
2005: type = sshkey_type_from_name(ktype);
2006: if (!allow_cert && sshkey_type_is_cert(type)) {
2007: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2008: goto out;
2009: }
2010: switch (type) {
2011: #ifdef WITH_OPENSSL
2012: case KEY_RSA_CERT:
1.14 djm 2013: /* Skip nonce */
1.1 djm 2014: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2015: ret = SSH_ERR_INVALID_FORMAT;
2016: goto out;
2017: }
2018: /* FALLTHROUGH */
2019: case KEY_RSA:
2020: if ((key = sshkey_new(type)) == NULL) {
2021: ret = SSH_ERR_ALLOC_FAIL;
2022: goto out;
2023: }
1.69 ! djm 2024: if ((rsa_e = BN_new()) == NULL ||
! 2025: (rsa_n = BN_new()) == NULL) {
! 2026: ret = SSH_ERR_ALLOC_FAIL;
! 2027: goto out;
! 2028: }
! 2029: if (sshbuf_get_bignum2(b, rsa_e) != 0 ||
! 2030: sshbuf_get_bignum2(b, rsa_n) != 0) {
1.1 djm 2031: ret = SSH_ERR_INVALID_FORMAT;
2032: goto out;
2033: }
1.69 ! djm 2034: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
! 2035: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2036: goto out;
2037: }
1.69 ! djm 2038: rsa_n = rsa_e = NULL; /* transferred */
! 2039: if ((ret = check_rsa_length(key->rsa)) != 0)
! 2040: goto out;
1.1 djm 2041: #ifdef DEBUG_PK
2042: RSA_print_fp(stderr, key->rsa, 8);
2043: #endif
2044: break;
2045: case KEY_DSA_CERT:
1.14 djm 2046: /* Skip nonce */
1.1 djm 2047: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2048: ret = SSH_ERR_INVALID_FORMAT;
2049: goto out;
2050: }
2051: /* FALLTHROUGH */
2052: case KEY_DSA:
2053: if ((key = sshkey_new(type)) == NULL) {
2054: ret = SSH_ERR_ALLOC_FAIL;
2055: goto out;
2056: }
1.69 ! djm 2057: if ((dsa_p = BN_new()) == NULL ||
! 2058: (dsa_q = BN_new()) == NULL ||
! 2059: (dsa_g = BN_new()) == NULL ||
! 2060: (dsa_pub_key = BN_new()) == NULL) {
! 2061: ret = SSH_ERR_ALLOC_FAIL;
! 2062: goto out;
! 2063: }
! 2064: if (sshbuf_get_bignum2(b, dsa_p) != 0 ||
! 2065: sshbuf_get_bignum2(b, dsa_q) != 0 ||
! 2066: sshbuf_get_bignum2(b, dsa_g) != 0 ||
! 2067: sshbuf_get_bignum2(b, dsa_pub_key) != 0) {
1.1 djm 2068: ret = SSH_ERR_INVALID_FORMAT;
2069: goto out;
2070: }
1.69 ! djm 2071: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
! 2072: ret = SSH_ERR_LIBCRYPTO_ERROR;
! 2073: goto out;
! 2074: }
! 2075: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
! 2076: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
! 2077: ret = SSH_ERR_LIBCRYPTO_ERROR;
! 2078: goto out;
! 2079: }
! 2080: dsa_pub_key = NULL; /* transferred */
1.1 djm 2081: #ifdef DEBUG_PK
2082: DSA_print_fp(stderr, key->dsa, 8);
2083: #endif
2084: break;
2085: case KEY_ECDSA_CERT:
1.14 djm 2086: /* Skip nonce */
1.1 djm 2087: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2088: ret = SSH_ERR_INVALID_FORMAT;
2089: goto out;
2090: }
2091: /* FALLTHROUGH */
2092: case KEY_ECDSA:
2093: if ((key = sshkey_new(type)) == NULL) {
2094: ret = SSH_ERR_ALLOC_FAIL;
2095: goto out;
2096: }
1.12 djm 2097: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2098: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2099: ret = SSH_ERR_INVALID_FORMAT;
2100: goto out;
2101: }
2102: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2103: ret = SSH_ERR_EC_CURVE_MISMATCH;
2104: goto out;
2105: }
1.60 jsing 2106: EC_KEY_free(key->ecdsa);
1.1 djm 2107: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2108: == NULL) {
2109: ret = SSH_ERR_EC_CURVE_INVALID;
2110: goto out;
2111: }
2112: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2113: ret = SSH_ERR_ALLOC_FAIL;
2114: goto out;
2115: }
2116: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2117: ret = SSH_ERR_INVALID_FORMAT;
2118: goto out;
2119: }
2120: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2121: q) != 0) {
2122: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2123: goto out;
2124: }
2125: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2126: /* XXX assume it is a allocation error */
2127: ret = SSH_ERR_ALLOC_FAIL;
2128: goto out;
2129: }
2130: #ifdef DEBUG_PK
2131: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2132: #endif
2133: break;
2134: #endif /* WITH_OPENSSL */
2135: case KEY_ED25519_CERT:
1.14 djm 2136: /* Skip nonce */
1.1 djm 2137: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2138: ret = SSH_ERR_INVALID_FORMAT;
2139: goto out;
2140: }
2141: /* FALLTHROUGH */
2142: case KEY_ED25519:
2143: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2144: goto out;
2145: if (len != ED25519_PK_SZ) {
2146: ret = SSH_ERR_INVALID_FORMAT;
2147: goto out;
2148: }
2149: if ((key = sshkey_new(type)) == NULL) {
2150: ret = SSH_ERR_ALLOC_FAIL;
2151: goto out;
2152: }
2153: key->ed25519_pk = pk;
2154: pk = NULL;
2155: break;
1.62 markus 2156: #ifdef WITH_XMSS
2157: case KEY_XMSS_CERT:
2158: /* Skip nonce */
2159: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2160: ret = SSH_ERR_INVALID_FORMAT;
2161: goto out;
2162: }
2163: /* FALLTHROUGH */
2164: case KEY_XMSS:
2165: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2166: goto out;
2167: if ((key = sshkey_new(type)) == NULL) {
2168: ret = SSH_ERR_ALLOC_FAIL;
2169: goto out;
2170: }
2171: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2172: goto out;
2173: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2174: goto out;
2175: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2176: ret = SSH_ERR_INVALID_FORMAT;
2177: goto out;
2178: }
2179: key->xmss_pk = pk;
2180: pk = NULL;
2181: if (type != KEY_XMSS_CERT &&
2182: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2183: goto out;
2184: break;
2185: #endif /* WITH_XMSS */
1.1 djm 2186: case KEY_UNSPEC:
2187: default:
2188: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2189: goto out;
2190: }
2191:
2192: /* Parse certificate potion */
1.14 djm 2193: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2194: goto out;
2195:
2196: if (key != NULL && sshbuf_len(b) != 0) {
2197: ret = SSH_ERR_INVALID_FORMAT;
2198: goto out;
2199: }
2200: ret = 0;
1.32 djm 2201: if (keyp != NULL) {
2202: *keyp = key;
2203: key = NULL;
2204: }
1.1 djm 2205: out:
1.14 djm 2206: sshbuf_free(copy);
1.1 djm 2207: sshkey_free(key);
1.62 markus 2208: free(xmss_name);
1.1 djm 2209: free(ktype);
2210: free(curve);
2211: free(pk);
2212: #ifdef WITH_OPENSSL
1.60 jsing 2213: EC_POINT_free(q);
1.69 ! djm 2214: BN_clear_free(rsa_n);
! 2215: BN_clear_free(rsa_e);
! 2216: BN_clear_free(dsa_p);
! 2217: BN_clear_free(dsa_q);
! 2218: BN_clear_free(dsa_g);
! 2219: BN_clear_free(dsa_pub_key);
1.1 djm 2220: #endif /* WITH_OPENSSL */
2221: return ret;
2222: }
2223:
2224: int
2225: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2226: {
1.14 djm 2227: struct sshbuf *b;
2228: int r;
2229:
2230: if ((b = sshbuf_from(blob, blen)) == NULL)
2231: return SSH_ERR_ALLOC_FAIL;
2232: r = sshkey_from_blob_internal(b, keyp, 1);
2233: sshbuf_free(b);
2234: return r;
2235: }
2236:
2237: int
2238: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2239: {
2240: return sshkey_from_blob_internal(b, keyp, 1);
2241: }
2242:
2243: int
2244: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2245: {
2246: struct sshbuf *b;
2247: int r;
2248:
2249: if ((r = sshbuf_froms(buf, &b)) != 0)
2250: return r;
2251: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2252: sshbuf_free(b);
2253: return r;
2254: }
2255:
1.65 djm 2256: static int
2257: get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2258: {
2259: int r;
2260: struct sshbuf *b = NULL;
2261: char *sigtype = NULL;
2262:
2263: if (sigtypep != NULL)
2264: *sigtypep = NULL;
2265: if ((b = sshbuf_from(sig, siglen)) == NULL)
2266: return SSH_ERR_ALLOC_FAIL;
2267: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2268: goto out;
2269: /* success */
2270: if (sigtypep != NULL) {
2271: *sigtypep = sigtype;
2272: sigtype = NULL;
2273: }
2274: r = 0;
2275: out:
2276: free(sigtype);
1.14 djm 2277: sshbuf_free(b);
2278: return r;
1.68 djm 2279: }
2280:
2281: /*
2282: *
2283: * Checks whether a certificate's signature type is allowed.
2284: * Returns 0 (success) if the certificate signature type appears in the
2285: * "allowed" pattern-list, or the key is not a certificate to begin with.
2286: * Otherwise returns a ssherr.h code.
2287: */
2288: int
2289: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2290: {
2291: if (key == NULL || allowed == NULL)
2292: return SSH_ERR_INVALID_ARGUMENT;
2293: if (!sshkey_type_is_cert(key->type))
2294: return 0;
2295: if (key->cert == NULL || key->cert->signature_type == NULL)
2296: return SSH_ERR_INVALID_ARGUMENT;
2297: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2298: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2299: return 0;
1.65 djm 2300: }
2301:
2302: /*
2303: * Returns the expected signature algorithm for a given public key algorithm.
2304: */
1.66 djm 2305: const char *
2306: sshkey_sigalg_by_name(const char *name)
1.65 djm 2307: {
2308: const struct keytype *kt;
2309:
2310: for (kt = keytypes; kt->type != -1; kt++) {
2311: if (strcmp(kt->name, name) != 0)
2312: continue;
2313: if (kt->sigalg != NULL)
2314: return kt->sigalg;
2315: if (!kt->cert)
2316: return kt->name;
2317: return sshkey_ssh_name_from_type_nid(
2318: sshkey_type_plain(kt->type), kt->nid);
2319: }
2320: return NULL;
2321: }
2322:
2323: /*
2324: * Verifies that the signature algorithm appearing inside the signature blob
2325: * matches that which was requested.
2326: */
2327: int
2328: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2329: const char *requested_alg)
2330: {
2331: const char *expected_alg;
2332: char *sigtype = NULL;
2333: int r;
2334:
2335: if (requested_alg == NULL)
2336: return 0;
1.66 djm 2337: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2338: return SSH_ERR_INVALID_ARGUMENT;
2339: if ((r = get_sigtype(sig, siglen, &sigtype)) != 0)
2340: return r;
2341: r = strcmp(expected_alg, sigtype) == 0;
2342: free(sigtype);
2343: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2344: }
2345:
2346: int
2347: sshkey_sign(const struct sshkey *key,
2348: u_char **sigp, size_t *lenp,
1.28 markus 2349: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2350: {
2351: if (sigp != NULL)
2352: *sigp = NULL;
2353: if (lenp != NULL)
2354: *lenp = 0;
2355: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2356: return SSH_ERR_INVALID_ARGUMENT;
2357: switch (key->type) {
2358: #ifdef WITH_OPENSSL
2359: case KEY_DSA_CERT:
2360: case KEY_DSA:
2361: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2362: case KEY_ECDSA_CERT:
2363: case KEY_ECDSA:
2364: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2365: case KEY_RSA_CERT:
2366: case KEY_RSA:
1.28 markus 2367: return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
1.1 djm 2368: #endif /* WITH_OPENSSL */
2369: case KEY_ED25519:
2370: case KEY_ED25519_CERT:
2371: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.62 markus 2372: #ifdef WITH_XMSS
2373: case KEY_XMSS:
2374: case KEY_XMSS_CERT:
2375: return ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2376: #endif /* WITH_XMSS */
1.1 djm 2377: default:
2378: return SSH_ERR_KEY_TYPE_UNKNOWN;
2379: }
2380: }
2381:
2382: /*
2383: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2384: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2385: */
2386: int
2387: sshkey_verify(const struct sshkey *key,
2388: const u_char *sig, size_t siglen,
1.59 djm 2389: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2390: {
1.6 djm 2391: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2392: return SSH_ERR_INVALID_ARGUMENT;
2393: switch (key->type) {
2394: #ifdef WITH_OPENSSL
2395: case KEY_DSA_CERT:
2396: case KEY_DSA:
2397: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2398: case KEY_ECDSA_CERT:
2399: case KEY_ECDSA:
2400: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2401: case KEY_RSA_CERT:
2402: case KEY_RSA:
1.59 djm 2403: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2404: #endif /* WITH_OPENSSL */
2405: case KEY_ED25519:
2406: case KEY_ED25519_CERT:
2407: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.62 markus 2408: #ifdef WITH_XMSS
2409: case KEY_XMSS:
2410: case KEY_XMSS_CERT:
2411: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2412: #endif /* WITH_XMSS */
1.1 djm 2413: default:
2414: return SSH_ERR_KEY_TYPE_UNKNOWN;
2415: }
2416: }
2417:
2418: /* Convert a plain key to their _CERT equivalent */
2419: int
1.20 djm 2420: sshkey_to_certified(struct sshkey *k)
1.1 djm 2421: {
2422: int newtype;
2423:
2424: switch (k->type) {
2425: #ifdef WITH_OPENSSL
2426: case KEY_RSA:
1.20 djm 2427: newtype = KEY_RSA_CERT;
1.1 djm 2428: break;
2429: case KEY_DSA:
1.20 djm 2430: newtype = KEY_DSA_CERT;
1.1 djm 2431: break;
2432: case KEY_ECDSA:
2433: newtype = KEY_ECDSA_CERT;
2434: break;
2435: #endif /* WITH_OPENSSL */
2436: case KEY_ED25519:
2437: newtype = KEY_ED25519_CERT;
2438: break;
1.62 markus 2439: #ifdef WITH_XMSS
2440: case KEY_XMSS:
2441: newtype = KEY_XMSS_CERT;
2442: break;
2443: #endif /* WITH_XMSS */
1.1 djm 2444: default:
2445: return SSH_ERR_INVALID_ARGUMENT;
2446: }
2447: if ((k->cert = cert_new()) == NULL)
2448: return SSH_ERR_ALLOC_FAIL;
2449: k->type = newtype;
2450: return 0;
2451: }
2452:
2453: /* Convert a certificate to its raw key equivalent */
2454: int
2455: sshkey_drop_cert(struct sshkey *k)
2456: {
2457: if (!sshkey_type_is_cert(k->type))
2458: return SSH_ERR_KEY_TYPE_UNKNOWN;
2459: cert_free(k->cert);
2460: k->cert = NULL;
2461: k->type = sshkey_type_plain(k->type);
2462: return 0;
2463: }
2464:
2465: /* Sign a certified key, (re-)generating the signed certblob. */
2466: int
1.53 djm 2467: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2468: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2469: {
2470: struct sshbuf *principals = NULL;
2471: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2472: size_t i, ca_len, sig_len;
2473: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2474: struct sshbuf *cert = NULL;
2475: char *sigtype = NULL;
1.69 ! djm 2476: #ifdef WITH_OPENSSL
! 2477: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
! 2478: #endif /* WITH_OPENSSL */
1.1 djm 2479:
2480: if (k == NULL || k->cert == NULL ||
2481: k->cert->certblob == NULL || ca == NULL)
2482: return SSH_ERR_INVALID_ARGUMENT;
2483: if (!sshkey_is_cert(k))
2484: return SSH_ERR_KEY_TYPE_UNKNOWN;
2485: if (!sshkey_type_is_valid_ca(ca->type))
2486: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2487:
1.67 djm 2488: /*
2489: * If no alg specified as argument but a signature_type was set,
2490: * then prefer that. If both were specified, then they must match.
2491: */
2492: if (alg == NULL)
2493: alg = k->cert->signature_type;
2494: else if (k->cert->signature_type != NULL &&
2495: strcmp(alg, k->cert->signature_type) != 0)
2496: return SSH_ERR_INVALID_ARGUMENT;
2497:
1.1 djm 2498: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2499: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2500:
2501: cert = k->cert->certblob; /* for readability */
2502: sshbuf_reset(cert);
2503: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2504: goto out;
2505:
2506: /* -v01 certs put nonce first */
2507: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2508: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2509: goto out;
1.1 djm 2510:
2511: /* XXX this substantially duplicates to_blob(); refactor */
2512: switch (k->type) {
2513: #ifdef WITH_OPENSSL
2514: case KEY_DSA_CERT:
1.69 ! djm 2515: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
! 2516: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
! 2517: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
! 2518: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
! 2519: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
! 2520: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2521: goto out;
2522: break;
2523: case KEY_ECDSA_CERT:
2524: if ((ret = sshbuf_put_cstring(cert,
2525: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2526: (ret = sshbuf_put_ec(cert,
2527: EC_KEY_get0_public_key(k->ecdsa),
2528: EC_KEY_get0_group(k->ecdsa))) != 0)
2529: goto out;
2530: break;
2531: case KEY_RSA_CERT:
1.69 ! djm 2532: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
! 2533: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
! 2534: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2535: goto out;
2536: break;
2537: #endif /* WITH_OPENSSL */
2538: case KEY_ED25519_CERT:
2539: if ((ret = sshbuf_put_string(cert,
2540: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2541: goto out;
2542: break;
1.62 markus 2543: #ifdef WITH_XMSS
2544: case KEY_XMSS_CERT:
2545: if (k->xmss_name == NULL) {
2546: ret = SSH_ERR_INVALID_ARGUMENT;
2547: goto out;
2548: }
2549: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2550: (ret = sshbuf_put_string(cert,
2551: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2552: goto out;
2553: break;
2554: #endif /* WITH_XMSS */
1.1 djm 2555: default:
2556: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2557: goto out;
1.1 djm 2558: }
2559:
1.20 djm 2560: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2561: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2562: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2563: goto out;
2564:
2565: if ((principals = sshbuf_new()) == NULL) {
2566: ret = SSH_ERR_ALLOC_FAIL;
2567: goto out;
2568: }
2569: for (i = 0; i < k->cert->nprincipals; i++) {
2570: if ((ret = sshbuf_put_cstring(principals,
2571: k->cert->principals[i])) != 0)
2572: goto out;
2573: }
2574: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2575: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2576: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2577: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2578: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2579: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2580: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2581: goto out;
2582:
2583: /* Sign the whole mess */
1.53 djm 2584: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2585: sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
1.1 djm 2586: goto out;
1.67 djm 2587: /* Check and update signature_type against what was actually used */
2588: if ((ret = get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
2589: goto out;
2590: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2591: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2592: goto out;
2593: }
2594: if (k->cert->signature_type == NULL) {
2595: k->cert->signature_type = sigtype;
2596: sigtype = NULL;
2597: }
1.1 djm 2598: /* Append signature and we are done */
2599: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2600: goto out;
2601: ret = 0;
2602: out:
2603: if (ret != 0)
2604: sshbuf_reset(cert);
1.29 mmcc 2605: free(sig_blob);
2606: free(ca_blob);
1.67 djm 2607: free(sigtype);
1.31 mmcc 2608: sshbuf_free(principals);
1.1 djm 2609: return ret;
1.53 djm 2610: }
2611:
2612: static int
2613: default_key_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
2614: const u_char *data, size_t datalen,
2615: const char *alg, u_int compat, void *ctx)
2616: {
2617: if (ctx != NULL)
2618: return SSH_ERR_INVALID_ARGUMENT;
2619: return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2620: }
2621:
2622: int
2623: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2624: {
2625: return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
1.1 djm 2626: }
2627:
2628: int
2629: sshkey_cert_check_authority(const struct sshkey *k,
2630: int want_host, int require_principal,
2631: const char *name, const char **reason)
2632: {
2633: u_int i, principal_matches;
2634: time_t now = time(NULL);
2635:
2636: if (reason != NULL)
2637: *reason = NULL;
2638:
2639: if (want_host) {
2640: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2641: *reason = "Certificate invalid: not a host certificate";
2642: return SSH_ERR_KEY_CERT_INVALID;
2643: }
2644: } else {
2645: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2646: *reason = "Certificate invalid: not a user certificate";
2647: return SSH_ERR_KEY_CERT_INVALID;
2648: }
2649: }
2650: if (now < 0) {
2651: /* yikes - system clock before epoch! */
2652: *reason = "Certificate invalid: not yet valid";
2653: return SSH_ERR_KEY_CERT_INVALID;
2654: }
2655: if ((u_int64_t)now < k->cert->valid_after) {
2656: *reason = "Certificate invalid: not yet valid";
2657: return SSH_ERR_KEY_CERT_INVALID;
2658: }
2659: if ((u_int64_t)now >= k->cert->valid_before) {
2660: *reason = "Certificate invalid: expired";
2661: return SSH_ERR_KEY_CERT_INVALID;
2662: }
2663: if (k->cert->nprincipals == 0) {
2664: if (require_principal) {
2665: *reason = "Certificate lacks principal list";
2666: return SSH_ERR_KEY_CERT_INVALID;
2667: }
2668: } else if (name != NULL) {
2669: principal_matches = 0;
2670: for (i = 0; i < k->cert->nprincipals; i++) {
2671: if (strcmp(name, k->cert->principals[i]) == 0) {
2672: principal_matches = 1;
2673: break;
2674: }
2675: }
2676: if (!principal_matches) {
2677: *reason = "Certificate invalid: name is not a listed "
2678: "principal";
2679: return SSH_ERR_KEY_CERT_INVALID;
2680: }
2681: }
2682: return 0;
1.27 djm 2683: }
2684:
2685: size_t
2686: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2687: {
2688: char from[32], to[32], ret[64];
2689: time_t tt;
2690: struct tm *tm;
2691:
2692: *from = *to = '\0';
2693: if (cert->valid_after == 0 &&
2694: cert->valid_before == 0xffffffffffffffffULL)
2695: return strlcpy(s, "forever", l);
2696:
2697: if (cert->valid_after != 0) {
2698: /* XXX revisit INT_MAX in 2038 :) */
2699: tt = cert->valid_after > INT_MAX ?
2700: INT_MAX : cert->valid_after;
2701: tm = localtime(&tt);
2702: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2703: }
2704: if (cert->valid_before != 0xffffffffffffffffULL) {
2705: /* XXX revisit INT_MAX in 2038 :) */
2706: tt = cert->valid_before > INT_MAX ?
2707: INT_MAX : cert->valid_before;
2708: tm = localtime(&tt);
2709: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2710: }
2711:
2712: if (cert->valid_after == 0)
2713: snprintf(ret, sizeof(ret), "before %s", to);
2714: else if (cert->valid_before == 0xffffffffffffffffULL)
2715: snprintf(ret, sizeof(ret), "after %s", from);
2716: else
2717: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2718:
2719: return strlcpy(s, ret, l);
1.1 djm 2720: }
2721:
2722: int
1.62 markus 2723: sshkey_private_serialize_opt(const struct sshkey *key, struct sshbuf *b,
2724: enum sshkey_serialize_rep opts)
1.1 djm 2725: {
2726: int r = SSH_ERR_INTERNAL_ERROR;
1.69 ! djm 2727: #ifdef WITH_OPENSSL
! 2728: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
! 2729: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
! 2730: #endif /* WITH_OPENSSL */
1.1 djm 2731:
2732: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2733: goto out;
2734: switch (key->type) {
2735: #ifdef WITH_OPENSSL
2736: case KEY_RSA:
1.69 ! djm 2737: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
! 2738: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
! 2739: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
! 2740: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
! 2741: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
! 2742: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
! 2743: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
! 2744: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
! 2745: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2746: goto out;
2747: break;
2748: case KEY_RSA_CERT:
2749: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2750: r = SSH_ERR_INVALID_ARGUMENT;
2751: goto out;
2752: }
1.69 ! djm 2753: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
! 2754: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
! 2755: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2756: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 ! djm 2757: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
! 2758: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
! 2759: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
! 2760: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2761: goto out;
2762: break;
2763: case KEY_DSA:
1.69 ! djm 2764: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
! 2765: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
! 2766: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
! 2767: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
! 2768: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
! 2769: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
! 2770: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2771: goto out;
2772: break;
2773: case KEY_DSA_CERT:
2774: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2775: r = SSH_ERR_INVALID_ARGUMENT;
2776: goto out;
2777: }
1.69 ! djm 2778: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2779: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 ! djm 2780: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2781: goto out;
2782: break;
2783: case KEY_ECDSA:
2784: if ((r = sshbuf_put_cstring(b,
2785: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2786: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2787: (r = sshbuf_put_bignum2(b,
2788: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2789: goto out;
2790: break;
2791: case KEY_ECDSA_CERT:
2792: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2793: r = SSH_ERR_INVALID_ARGUMENT;
2794: goto out;
2795: }
2796: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2797: (r = sshbuf_put_bignum2(b,
2798: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2799: goto out;
2800: break;
2801: #endif /* WITH_OPENSSL */
2802: case KEY_ED25519:
2803: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2804: ED25519_PK_SZ)) != 0 ||
2805: (r = sshbuf_put_string(b, key->ed25519_sk,
2806: ED25519_SK_SZ)) != 0)
2807: goto out;
2808: break;
2809: case KEY_ED25519_CERT:
2810: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2811: r = SSH_ERR_INVALID_ARGUMENT;
2812: goto out;
2813: }
2814: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2815: (r = sshbuf_put_string(b, key->ed25519_pk,
2816: ED25519_PK_SZ)) != 0 ||
2817: (r = sshbuf_put_string(b, key->ed25519_sk,
2818: ED25519_SK_SZ)) != 0)
2819: goto out;
2820: break;
1.62 markus 2821: #ifdef WITH_XMSS
2822: case KEY_XMSS:
2823: if (key->xmss_name == NULL) {
2824: r = SSH_ERR_INVALID_ARGUMENT;
2825: goto out;
2826: }
2827: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2828: (r = sshbuf_put_string(b, key->xmss_pk,
2829: sshkey_xmss_pklen(key))) != 0 ||
2830: (r = sshbuf_put_string(b, key->xmss_sk,
2831: sshkey_xmss_sklen(key))) != 0 ||
2832: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2833: goto out;
2834: break;
2835: case KEY_XMSS_CERT:
2836: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2837: key->xmss_name == NULL) {
2838: r = SSH_ERR_INVALID_ARGUMENT;
2839: goto out;
2840: }
2841: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2842: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2843: (r = sshbuf_put_string(b, key->xmss_pk,
2844: sshkey_xmss_pklen(key))) != 0 ||
2845: (r = sshbuf_put_string(b, key->xmss_sk,
2846: sshkey_xmss_sklen(key))) != 0 ||
2847: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2848: goto out;
2849: break;
2850: #endif /* WITH_XMSS */
1.1 djm 2851: default:
2852: r = SSH_ERR_INVALID_ARGUMENT;
2853: goto out;
2854: }
2855: /* success */
2856: r = 0;
2857: out:
2858: return r;
2859: }
2860:
2861: int
1.62 markus 2862: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2863: {
2864: return sshkey_private_serialize_opt(key, b,
2865: SSHKEY_SERIALIZE_DEFAULT);
2866: }
2867:
2868: int
1.1 djm 2869: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2870: {
1.62 markus 2871: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2872: struct sshkey *k = NULL;
1.14 djm 2873: size_t pklen = 0, sklen = 0;
1.1 djm 2874: int type, r = SSH_ERR_INTERNAL_ERROR;
2875: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 2876: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2877: #ifdef WITH_OPENSSL
2878: BIGNUM *exponent = NULL;
1.69 ! djm 2879: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
! 2880: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
! 2881: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
! 2882: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2883: #endif /* WITH_OPENSSL */
2884:
2885: if (kp != NULL)
2886: *kp = NULL;
2887: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2888: goto out;
2889: type = sshkey_type_from_name(tname);
2890: switch (type) {
2891: #ifdef WITH_OPENSSL
2892: case KEY_DSA:
2893: if ((k = sshkey_new_private(type)) == NULL) {
2894: r = SSH_ERR_ALLOC_FAIL;
2895: goto out;
2896: }
1.69 ! djm 2897: if ((dsa_p = BN_new()) == NULL ||
! 2898: (dsa_q = BN_new()) == NULL ||
! 2899: (dsa_g = BN_new()) == NULL ||
! 2900: (dsa_pub_key = BN_new()) == NULL ||
! 2901: (dsa_priv_key = BN_new()) == NULL) {
! 2902: r = SSH_ERR_ALLOC_FAIL;
! 2903: goto out;
! 2904: }
! 2905: if ((r = sshbuf_get_bignum2(buf, dsa_p)) != 0 ||
! 2906: (r = sshbuf_get_bignum2(buf, dsa_q)) != 0 ||
! 2907: (r = sshbuf_get_bignum2(buf, dsa_g)) != 0 ||
! 2908: (r = sshbuf_get_bignum2(buf, dsa_pub_key)) != 0 ||
! 2909: (r = sshbuf_get_bignum2(buf, dsa_priv_key)) != 0)
! 2910: goto out;
! 2911: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
! 2912: r = SSH_ERR_LIBCRYPTO_ERROR;
! 2913: goto out;
! 2914: }
! 2915: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
! 2916: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
! 2917: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2918: goto out;
1.69 ! djm 2919: }
! 2920: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 2921: break;
2922: case KEY_DSA_CERT:
1.69 ! djm 2923: if ((dsa_priv_key = BN_new()) == NULL) {
! 2924: r = SSH_ERR_ALLOC_FAIL;
! 2925: goto out;
! 2926: }
1.14 djm 2927: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.69 ! djm 2928: (r = sshbuf_get_bignum2(buf, dsa_priv_key)) != 0)
1.1 djm 2929: goto out;
1.69 ! djm 2930: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
! 2931: r = SSH_ERR_LIBCRYPTO_ERROR;
! 2932: goto out;
! 2933: }
! 2934: dsa_priv_key = NULL; /* transferred */
1.1 djm 2935: break;
2936: case KEY_ECDSA:
2937: if ((k = sshkey_new_private(type)) == NULL) {
2938: r = SSH_ERR_ALLOC_FAIL;
2939: goto out;
2940: }
2941: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2942: r = SSH_ERR_INVALID_ARGUMENT;
2943: goto out;
2944: }
2945: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2946: goto out;
2947: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2948: r = SSH_ERR_EC_CURVE_MISMATCH;
2949: goto out;
2950: }
2951: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2952: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2953: r = SSH_ERR_LIBCRYPTO_ERROR;
2954: goto out;
2955: }
2956: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2957: (r = sshbuf_get_bignum2(buf, exponent)))
2958: goto out;
2959: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2960: r = SSH_ERR_LIBCRYPTO_ERROR;
2961: goto out;
2962: }
2963: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2964: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2965: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2966: goto out;
2967: break;
2968: case KEY_ECDSA_CERT:
2969: if ((exponent = BN_new()) == NULL) {
2970: r = SSH_ERR_LIBCRYPTO_ERROR;
2971: goto out;
2972: }
1.14 djm 2973: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2974: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2975: goto out;
2976: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2977: r = SSH_ERR_LIBCRYPTO_ERROR;
2978: goto out;
2979: }
2980: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2981: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2982: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2983: goto out;
2984: break;
2985: case KEY_RSA:
2986: if ((k = sshkey_new_private(type)) == NULL) {
2987: r = SSH_ERR_ALLOC_FAIL;
2988: goto out;
2989: }
1.69 ! djm 2990: if ((rsa_n = BN_new()) == NULL ||
! 2991: (rsa_e = BN_new()) == NULL ||
! 2992: (rsa_d = BN_new()) == NULL ||
! 2993: (rsa_iqmp = BN_new()) == NULL ||
! 2994: (rsa_p = BN_new()) == NULL ||
! 2995: (rsa_q = BN_new()) == NULL) {
! 2996: r = SSH_ERR_ALLOC_FAIL;
! 2997: goto out;
! 2998: }
! 2999: if ((r = sshbuf_get_bignum2(buf, rsa_n)) != 0 ||
! 3000: (r = sshbuf_get_bignum2(buf, rsa_e)) != 0 ||
! 3001: (r = sshbuf_get_bignum2(buf, rsa_d)) != 0 ||
! 3002: (r = sshbuf_get_bignum2(buf, rsa_iqmp)) != 0 ||
! 3003: (r = sshbuf_get_bignum2(buf, rsa_p)) != 0 ||
! 3004: (r = sshbuf_get_bignum2(buf, rsa_q)) != 0)
1.1 djm 3005: goto out;
1.69 ! djm 3006: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
! 3007: r = SSH_ERR_LIBCRYPTO_ERROR;
! 3008: goto out;
! 3009: }
! 3010: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
! 3011: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
! 3012: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3013: goto out;
3014: }
1.69 ! djm 3015: rsa_p = rsa_q = NULL; /* transferred */
! 3016: if ((r = check_rsa_length(k->rsa)) != 0)
! 3017: goto out;
! 3018: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
! 3019: goto out;
1.1 djm 3020: break;
3021: case KEY_RSA_CERT:
1.69 ! djm 3022: if ((rsa_d = BN_new()) == NULL ||
! 3023: (rsa_iqmp = BN_new()) == NULL ||
! 3024: (rsa_p = BN_new()) == NULL ||
! 3025: (rsa_q = BN_new()) == NULL) {
! 3026: r = SSH_ERR_ALLOC_FAIL;
! 3027: goto out;
! 3028: }
1.14 djm 3029: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.69 ! djm 3030: (r = sshbuf_get_bignum2(buf, rsa_d)) != 0 ||
! 3031: (r = sshbuf_get_bignum2(buf, rsa_iqmp)) != 0 ||
! 3032: (r = sshbuf_get_bignum2(buf, rsa_p)) != 0 ||
! 3033: (r = sshbuf_get_bignum2(buf, rsa_q)) != 0)
1.1 djm 3034: goto out;
1.69 ! djm 3035: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
! 3036: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3037: goto out;
3038: }
1.69 ! djm 3039: rsa_d = NULL; /* transferred */
! 3040: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
! 3041: r = SSH_ERR_LIBCRYPTO_ERROR;
! 3042: goto out;
! 3043: }
! 3044: rsa_p = rsa_q = NULL; /* transferred */
! 3045: if ((r = check_rsa_length(k->rsa)) != 0)
! 3046: goto out;
! 3047: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
! 3048: goto out;
1.1 djm 3049: break;
3050: #endif /* WITH_OPENSSL */
3051: case KEY_ED25519:
3052: if ((k = sshkey_new_private(type)) == NULL) {
3053: r = SSH_ERR_ALLOC_FAIL;
3054: goto out;
3055: }
3056: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3057: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3058: goto out;
3059: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3060: r = SSH_ERR_INVALID_FORMAT;
3061: goto out;
3062: }
3063: k->ed25519_pk = ed25519_pk;
3064: k->ed25519_sk = ed25519_sk;
3065: ed25519_pk = ed25519_sk = NULL;
3066: break;
3067: case KEY_ED25519_CERT:
1.14 djm 3068: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3069: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3070: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3071: goto out;
3072: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3073: r = SSH_ERR_INVALID_FORMAT;
3074: goto out;
3075: }
3076: k->ed25519_pk = ed25519_pk;
3077: k->ed25519_sk = ed25519_sk;
3078: ed25519_pk = ed25519_sk = NULL;
3079: break;
1.62 markus 3080: #ifdef WITH_XMSS
3081: case KEY_XMSS:
3082: if ((k = sshkey_new_private(type)) == NULL) {
3083: r = SSH_ERR_ALLOC_FAIL;
3084: goto out;
3085: }
3086: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3087: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3088: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3089: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3090: goto out;
3091: if (pklen != sshkey_xmss_pklen(k) ||
3092: sklen != sshkey_xmss_sklen(k)) {
3093: r = SSH_ERR_INVALID_FORMAT;
3094: goto out;
3095: }
3096: k->xmss_pk = xmss_pk;
3097: k->xmss_sk = xmss_sk;
3098: xmss_pk = xmss_sk = NULL;
3099: /* optional internal state */
3100: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3101: goto out;
3102: break;
3103: case KEY_XMSS_CERT:
3104: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3105: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3106: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3107: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3108: goto out;
1.64 markus 3109: if (strcmp(xmss_name, k->xmss_name)) {
3110: r = SSH_ERR_INVALID_FORMAT;
3111: goto out;
3112: }
1.62 markus 3113: if (pklen != sshkey_xmss_pklen(k) ||
3114: sklen != sshkey_xmss_sklen(k)) {
3115: r = SSH_ERR_INVALID_FORMAT;
3116: goto out;
3117: }
3118: k->xmss_pk = xmss_pk;
3119: k->xmss_sk = xmss_sk;
3120: xmss_pk = xmss_sk = NULL;
3121: /* optional internal state */
3122: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3123: goto out;
3124: break;
3125: #endif /* WITH_XMSS */
1.1 djm 3126: default:
3127: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3128: goto out;
3129: }
3130: #ifdef WITH_OPENSSL
3131: /* enable blinding */
3132: switch (k->type) {
3133: case KEY_RSA:
3134: case KEY_RSA_CERT:
3135: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3136: r = SSH_ERR_LIBCRYPTO_ERROR;
3137: goto out;
3138: }
3139: break;
3140: }
3141: #endif /* WITH_OPENSSL */
3142: /* success */
3143: r = 0;
3144: if (kp != NULL) {
3145: *kp = k;
3146: k = NULL;
3147: }
3148: out:
3149: free(tname);
3150: free(curve);
3151: #ifdef WITH_OPENSSL
1.60 jsing 3152: BN_clear_free(exponent);
1.69 ! djm 3153: BN_clear_free(dsa_p);
! 3154: BN_clear_free(dsa_q);
! 3155: BN_clear_free(dsa_g);
! 3156: BN_clear_free(dsa_pub_key);
! 3157: BN_clear_free(dsa_priv_key);
! 3158: BN_clear_free(rsa_n);
! 3159: BN_clear_free(rsa_e);
! 3160: BN_clear_free(rsa_d);
! 3161: BN_clear_free(rsa_p);
! 3162: BN_clear_free(rsa_q);
! 3163: BN_clear_free(rsa_iqmp);
1.1 djm 3164: #endif /* WITH_OPENSSL */
3165: sshkey_free(k);
1.61 jsing 3166: freezero(ed25519_pk, pklen);
3167: freezero(ed25519_sk, sklen);
1.62 markus 3168: free(xmss_name);
3169: freezero(xmss_pk, pklen);
3170: freezero(xmss_sk, sklen);
1.1 djm 3171: return r;
3172: }
3173:
3174: #ifdef WITH_OPENSSL
3175: int
3176: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3177: {
3178: BN_CTX *bnctx;
3179: EC_POINT *nq = NULL;
3180: BIGNUM *order, *x, *y, *tmp;
3181: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3182:
3183: /*
3184: * NB. This assumes OpenSSL has already verified that the public
3185: * point lies on the curve. This is done by EC_POINT_oct2point()
3186: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3187: * reachable with public points not unmarshalled using
3188: * EC_POINT_oct2point then the caller will need to explicitly check.
3189: */
1.1 djm 3190:
3191: if ((bnctx = BN_CTX_new()) == NULL)
3192: return SSH_ERR_ALLOC_FAIL;
3193: BN_CTX_start(bnctx);
3194:
3195: /*
3196: * We shouldn't ever hit this case because bignum_get_ecpoint()
3197: * refuses to load GF2m points.
3198: */
3199: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3200: NID_X9_62_prime_field)
3201: goto out;
3202:
3203: /* Q != infinity */
3204: if (EC_POINT_is_at_infinity(group, public))
3205: goto out;
3206:
3207: if ((x = BN_CTX_get(bnctx)) == NULL ||
3208: (y = BN_CTX_get(bnctx)) == NULL ||
3209: (order = BN_CTX_get(bnctx)) == NULL ||
3210: (tmp = BN_CTX_get(bnctx)) == NULL) {
3211: ret = SSH_ERR_ALLOC_FAIL;
3212: goto out;
3213: }
3214:
3215: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3216: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3217: EC_POINT_get_affine_coordinates_GFp(group, public,
3218: x, y, bnctx) != 1) {
3219: ret = SSH_ERR_LIBCRYPTO_ERROR;
3220: goto out;
3221: }
3222: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3223: BN_num_bits(y) <= BN_num_bits(order) / 2)
3224: goto out;
3225:
3226: /* nQ == infinity (n == order of subgroup) */
3227: if ((nq = EC_POINT_new(group)) == NULL) {
3228: ret = SSH_ERR_ALLOC_FAIL;
3229: goto out;
3230: }
3231: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3232: ret = SSH_ERR_LIBCRYPTO_ERROR;
3233: goto out;
3234: }
3235: if (EC_POINT_is_at_infinity(group, nq) != 1)
3236: goto out;
3237:
3238: /* x < order - 1, y < order - 1 */
3239: if (!BN_sub(tmp, order, BN_value_one())) {
3240: ret = SSH_ERR_LIBCRYPTO_ERROR;
3241: goto out;
3242: }
3243: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3244: goto out;
3245: ret = 0;
3246: out:
3247: BN_CTX_free(bnctx);
1.60 jsing 3248: EC_POINT_free(nq);
1.1 djm 3249: return ret;
3250: }
3251:
3252: int
3253: sshkey_ec_validate_private(const EC_KEY *key)
3254: {
3255: BN_CTX *bnctx;
3256: BIGNUM *order, *tmp;
3257: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3258:
3259: if ((bnctx = BN_CTX_new()) == NULL)
3260: return SSH_ERR_ALLOC_FAIL;
3261: BN_CTX_start(bnctx);
3262:
3263: if ((order = BN_CTX_get(bnctx)) == NULL ||
3264: (tmp = BN_CTX_get(bnctx)) == NULL) {
3265: ret = SSH_ERR_ALLOC_FAIL;
3266: goto out;
3267: }
3268:
3269: /* log2(private) > log2(order)/2 */
3270: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3271: ret = SSH_ERR_LIBCRYPTO_ERROR;
3272: goto out;
3273: }
3274: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3275: BN_num_bits(order) / 2)
3276: goto out;
3277:
3278: /* private < order - 1 */
3279: if (!BN_sub(tmp, order, BN_value_one())) {
3280: ret = SSH_ERR_LIBCRYPTO_ERROR;
3281: goto out;
3282: }
3283: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3284: goto out;
3285: ret = 0;
3286: out:
3287: BN_CTX_free(bnctx);
3288: return ret;
3289: }
3290:
3291: void
3292: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3293: {
3294: BIGNUM *x, *y;
3295: BN_CTX *bnctx;
3296:
3297: if (point == NULL) {
3298: fputs("point=(NULL)\n", stderr);
3299: return;
3300: }
3301: if ((bnctx = BN_CTX_new()) == NULL) {
3302: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3303: return;
3304: }
3305: BN_CTX_start(bnctx);
3306: if ((x = BN_CTX_get(bnctx)) == NULL ||
3307: (y = BN_CTX_get(bnctx)) == NULL) {
3308: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3309: return;
3310: }
3311: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3312: NID_X9_62_prime_field) {
3313: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3314: return;
3315: }
3316: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3317: bnctx) != 1) {
3318: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3319: __func__);
3320: return;
3321: }
3322: fputs("x=", stderr);
3323: BN_print_fp(stderr, x);
3324: fputs("\ny=", stderr);
3325: BN_print_fp(stderr, y);
3326: fputs("\n", stderr);
3327: BN_CTX_free(bnctx);
3328: }
3329:
3330: void
3331: sshkey_dump_ec_key(const EC_KEY *key)
3332: {
3333: const BIGNUM *exponent;
3334:
3335: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3336: EC_KEY_get0_public_key(key));
3337: fputs("exponent=", stderr);
3338: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3339: fputs("(NULL)", stderr);
3340: else
3341: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3342: fputs("\n", stderr);
3343: }
3344: #endif /* WITH_OPENSSL */
3345:
3346: static int
3347: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
3348: const char *passphrase, const char *comment, const char *ciphername,
3349: int rounds)
3350: {
1.4 djm 3351: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3352: u_char salt[SALT_LEN];
1.4 djm 3353: char *b64 = NULL;
1.1 djm 3354: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3355: u_int check;
3356: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3357: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3358: const struct sshcipher *cipher;
3359: const char *kdfname = KDFNAME;
3360: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3361:
3362: if (rounds <= 0)
3363: rounds = DEFAULT_ROUNDS;
3364: if (passphrase == NULL || !strlen(passphrase)) {
3365: ciphername = "none";
3366: kdfname = "none";
3367: } else if (ciphername == NULL)
3368: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3369: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3370: r = SSH_ERR_INVALID_ARGUMENT;
3371: goto out;
3372: }
3373:
3374: if ((kdf = sshbuf_new()) == NULL ||
3375: (encoded = sshbuf_new()) == NULL ||
3376: (encrypted = sshbuf_new()) == NULL) {
3377: r = SSH_ERR_ALLOC_FAIL;
3378: goto out;
3379: }
3380: blocksize = cipher_blocksize(cipher);
3381: keylen = cipher_keylen(cipher);
3382: ivlen = cipher_ivlen(cipher);
3383: authlen = cipher_authlen(cipher);
3384: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3385: r = SSH_ERR_ALLOC_FAIL;
3386: goto out;
3387: }
3388: if (strcmp(kdfname, "bcrypt") == 0) {
3389: arc4random_buf(salt, SALT_LEN);
3390: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3391: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3392: r = SSH_ERR_INVALID_ARGUMENT;
3393: goto out;
3394: }
3395: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3396: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3397: goto out;
3398: } else if (strcmp(kdfname, "none") != 0) {
3399: /* Unsupported KDF type */
3400: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3401: goto out;
3402: }
3403: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3404: key + keylen, ivlen, 1)) != 0)
3405: goto out;
3406:
3407: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3408: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3409: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3410: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3411: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3412: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3413: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3414: goto out;
3415:
3416: /* set up the buffer that will be encrypted */
3417:
3418: /* Random check bytes */
3419: check = arc4random();
3420: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3421: (r = sshbuf_put_u32(encrypted, check)) != 0)
3422: goto out;
3423:
3424: /* append private key and comment*/
1.62 markus 3425: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3426: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3427: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3428: goto out;
3429:
3430: /* padding */
3431: i = 0;
3432: while (sshbuf_len(encrypted) % blocksize) {
3433: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3434: goto out;
3435: }
3436:
3437: /* length in destination buffer */
3438: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3439: goto out;
3440:
3441: /* encrypt */
3442: if ((r = sshbuf_reserve(encoded,
3443: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3444: goto out;
1.36 djm 3445: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3446: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3447: goto out;
3448:
3449: /* uuencode */
3450: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3451: r = SSH_ERR_ALLOC_FAIL;
3452: goto out;
3453: }
3454:
3455: sshbuf_reset(blob);
3456: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3457: goto out;
3458: for (i = 0; i < strlen(b64); i++) {
3459: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3460: goto out;
3461: /* insert line breaks */
3462: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3463: goto out;
3464: }
3465: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3466: goto out;
3467: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3468: goto out;
3469:
3470: /* success */
3471: r = 0;
3472:
3473: out:
3474: sshbuf_free(kdf);
3475: sshbuf_free(encoded);
3476: sshbuf_free(encrypted);
1.36 djm 3477: cipher_free(ciphercontext);
1.1 djm 3478: explicit_bzero(salt, sizeof(salt));
3479: if (key != NULL) {
3480: explicit_bzero(key, keylen + ivlen);
3481: free(key);
3482: }
3483: if (pubkeyblob != NULL) {
3484: explicit_bzero(pubkeyblob, pubkeylen);
3485: free(pubkeyblob);
3486: }
3487: if (b64 != NULL) {
3488: explicit_bzero(b64, strlen(b64));
3489: free(b64);
3490: }
3491: return r;
3492: }
3493:
3494: static int
3495: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3496: struct sshkey **keyp, char **commentp)
3497: {
3498: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3499: const struct sshcipher *cipher = NULL;
3500: const u_char *cp;
3501: int r = SSH_ERR_INTERNAL_ERROR;
3502: size_t encoded_len;
1.18 djm 3503: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3504: struct sshbuf *encoded = NULL, *decoded = NULL;
3505: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3506: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3507: struct sshkey *k = NULL;
3508: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3509: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3510:
3511: if (keyp != NULL)
3512: *keyp = NULL;
3513: if (commentp != NULL)
3514: *commentp = NULL;
3515:
3516: if ((encoded = sshbuf_new()) == NULL ||
3517: (decoded = sshbuf_new()) == NULL ||
3518: (decrypted = sshbuf_new()) == NULL) {
3519: r = SSH_ERR_ALLOC_FAIL;
3520: goto out;
3521: }
3522:
3523: /* check preamble */
3524: cp = sshbuf_ptr(blob);
3525: encoded_len = sshbuf_len(blob);
3526: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3527: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3528: r = SSH_ERR_INVALID_FORMAT;
3529: goto out;
3530: }
3531: cp += MARK_BEGIN_LEN;
3532: encoded_len -= MARK_BEGIN_LEN;
3533:
3534: /* Look for end marker, removing whitespace as we go */
3535: while (encoded_len > 0) {
3536: if (*cp != '\n' && *cp != '\r') {
3537: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3538: goto out;
3539: }
3540: last = *cp;
3541: encoded_len--;
3542: cp++;
3543: if (last == '\n') {
3544: if (encoded_len >= MARK_END_LEN &&
3545: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3546: /* \0 terminate */
3547: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3548: goto out;
3549: break;
3550: }
3551: }
3552: }
3553: if (encoded_len == 0) {
3554: r = SSH_ERR_INVALID_FORMAT;
3555: goto out;
3556: }
3557:
3558: /* decode base64 */
1.4 djm 3559: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3560: goto out;
3561:
3562: /* check magic */
3563: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3564: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3565: r = SSH_ERR_INVALID_FORMAT;
3566: goto out;
3567: }
3568: /* parse public portion of key */
3569: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3570: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3571: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3572: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3573: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3574: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3575: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3576: goto out;
3577:
3578: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3579: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3580: goto out;
3581: }
3582: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3583: strcmp(ciphername, "none") != 0) {
3584: /* passphrase required */
3585: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3586: goto out;
3587: }
3588: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3589: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3590: goto out;
3591: }
3592: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3593: r = SSH_ERR_INVALID_FORMAT;
3594: goto out;
3595: }
3596: if (nkeys != 1) {
3597: /* XXX only one key supported */
3598: r = SSH_ERR_INVALID_FORMAT;
3599: goto out;
3600: }
3601:
3602: /* check size of encrypted key blob */
3603: blocksize = cipher_blocksize(cipher);
3604: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3605: r = SSH_ERR_INVALID_FORMAT;
3606: goto out;
3607: }
3608:
3609: /* setup key */
3610: keylen = cipher_keylen(cipher);
3611: ivlen = cipher_ivlen(cipher);
1.18 djm 3612: authlen = cipher_authlen(cipher);
1.1 djm 3613: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3614: r = SSH_ERR_ALLOC_FAIL;
3615: goto out;
3616: }
3617: if (strcmp(kdfname, "bcrypt") == 0) {
3618: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3619: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3620: goto out;
3621: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3622: key, keylen + ivlen, rounds) < 0) {
3623: r = SSH_ERR_INVALID_FORMAT;
3624: goto out;
3625: }
3626: }
3627:
1.18 djm 3628: /* check that an appropriate amount of auth data is present */
3629: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3630: r = SSH_ERR_INVALID_FORMAT;
3631: goto out;
3632: }
3633:
1.1 djm 3634: /* decrypt private portion of key */
3635: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3636: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3637: key + keylen, ivlen, 0)) != 0)
3638: goto out;
1.36 djm 3639: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3640: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3641: /* an integrity error here indicates an incorrect passphrase */
3642: if (r == SSH_ERR_MAC_INVALID)
3643: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3644: goto out;
3645: }
1.18 djm 3646: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3647: goto out;
3648: /* there should be no trailing data */
3649: if (sshbuf_len(decoded) != 0) {
3650: r = SSH_ERR_INVALID_FORMAT;
3651: goto out;
3652: }
3653:
3654: /* check check bytes */
3655: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3656: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3657: goto out;
3658: if (check1 != check2) {
3659: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3660: goto out;
3661: }
3662:
3663: /* Load the private key and comment */
3664: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3665: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3666: goto out;
3667:
3668: /* Check deterministic padding */
3669: i = 0;
3670: while (sshbuf_len(decrypted)) {
3671: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3672: goto out;
3673: if (pad != (++i & 0xff)) {
3674: r = SSH_ERR_INVALID_FORMAT;
3675: goto out;
3676: }
3677: }
3678:
3679: /* XXX decode pubkey and check against private */
3680:
3681: /* success */
3682: r = 0;
3683: if (keyp != NULL) {
3684: *keyp = k;
3685: k = NULL;
3686: }
3687: if (commentp != NULL) {
3688: *commentp = comment;
3689: comment = NULL;
3690: }
3691: out:
3692: pad = 0;
1.36 djm 3693: cipher_free(ciphercontext);
1.1 djm 3694: free(ciphername);
3695: free(kdfname);
3696: free(comment);
3697: if (salt != NULL) {
3698: explicit_bzero(salt, slen);
3699: free(salt);
3700: }
3701: if (key != NULL) {
3702: explicit_bzero(key, keylen + ivlen);
3703: free(key);
3704: }
3705: sshbuf_free(encoded);
3706: sshbuf_free(decoded);
3707: sshbuf_free(kdf);
3708: sshbuf_free(decrypted);
3709: sshkey_free(k);
3710: return r;
3711: }
3712:
3713:
3714: #ifdef WITH_OPENSSL
3715: /* convert SSH v2 key in OpenSSL PEM format */
3716: static int
3717: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3718: const char *_passphrase, const char *comment)
3719: {
3720: int success, r;
3721: int blen, len = strlen(_passphrase);
3722: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3723: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3724: char *bptr;
1.1 djm 3725: BIO *bio = NULL;
3726:
3727: if (len > 0 && len <= 4)
3728: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3729: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3730: return SSH_ERR_ALLOC_FAIL;
3731:
3732: switch (key->type) {
3733: case KEY_DSA:
3734: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3735: cipher, passphrase, len, NULL, NULL);
3736: break;
3737: case KEY_ECDSA:
3738: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3739: cipher, passphrase, len, NULL, NULL);
3740: break;
3741: case KEY_RSA:
3742: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3743: cipher, passphrase, len, NULL, NULL);
3744: break;
3745: default:
3746: success = 0;
3747: break;
3748: }
3749: if (success == 0) {
3750: r = SSH_ERR_LIBCRYPTO_ERROR;
3751: goto out;
3752: }
3753: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3754: r = SSH_ERR_INTERNAL_ERROR;
3755: goto out;
3756: }
3757: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3758: goto out;
3759: r = 0;
3760: out:
3761: BIO_free(bio);
3762: return r;
3763: }
3764: #endif /* WITH_OPENSSL */
3765:
3766: /* Serialise "key" to buffer "blob" */
3767: int
3768: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3769: const char *passphrase, const char *comment,
3770: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3771: {
3772: switch (key->type) {
1.9 markus 3773: #ifdef WITH_OPENSSL
1.1 djm 3774: case KEY_DSA:
3775: case KEY_ECDSA:
3776: case KEY_RSA:
3777: if (force_new_format) {
3778: return sshkey_private_to_blob2(key, blob, passphrase,
3779: comment, new_format_cipher, new_format_rounds);
3780: }
3781: return sshkey_private_pem_to_blob(key, blob,
3782: passphrase, comment);
3783: #endif /* WITH_OPENSSL */
3784: case KEY_ED25519:
1.62 markus 3785: #ifdef WITH_XMSS
3786: case KEY_XMSS:
3787: #endif /* WITH_XMSS */
1.1 djm 3788: return sshkey_private_to_blob2(key, blob, passphrase,
3789: comment, new_format_cipher, new_format_rounds);
3790: default:
3791: return SSH_ERR_KEY_TYPE_UNKNOWN;
3792: }
3793: }
3794:
3795:
3796: #ifdef WITH_OPENSSL
1.8 djm 3797: static int
1.52 djm 3798: translate_libcrypto_error(unsigned long pem_err)
3799: {
3800: int pem_reason = ERR_GET_REASON(pem_err);
3801:
3802: switch (ERR_GET_LIB(pem_err)) {
3803: case ERR_LIB_PEM:
3804: switch (pem_reason) {
3805: case PEM_R_BAD_PASSWORD_READ:
3806: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3807: case PEM_R_BAD_DECRYPT:
3808: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3809: default:
3810: return SSH_ERR_INVALID_FORMAT;
3811: }
3812: case ERR_LIB_EVP:
3813: switch (pem_reason) {
3814: case EVP_R_BAD_DECRYPT:
3815: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 ! djm 3816: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3817: case EVP_R_BN_DECODE_ERROR:
1.69 ! djm 3818: #endif
1.52 djm 3819: case EVP_R_DECODE_ERROR:
3820: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3821: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3822: #endif
3823: return SSH_ERR_INVALID_FORMAT;
3824: default:
3825: return SSH_ERR_LIBCRYPTO_ERROR;
3826: }
3827: case ERR_LIB_ASN1:
3828: return SSH_ERR_INVALID_FORMAT;
3829: }
3830: return SSH_ERR_LIBCRYPTO_ERROR;
3831: }
3832:
3833: static void
3834: clear_libcrypto_errors(void)
3835: {
3836: while (ERR_get_error() != 0)
3837: ;
3838: }
3839:
3840: /*
3841: * Translate OpenSSL error codes to determine whether
3842: * passphrase is required/incorrect.
3843: */
3844: static int
3845: convert_libcrypto_error(void)
3846: {
3847: /*
3848: * Some password errors are reported at the beginning
3849: * of the error queue.
3850: */
3851: if (translate_libcrypto_error(ERR_peek_error()) ==
3852: SSH_ERR_KEY_WRONG_PASSPHRASE)
3853: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3854: return translate_libcrypto_error(ERR_peek_last_error());
3855: }
3856:
3857: static int
1.1 djm 3858: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3859: const char *passphrase, struct sshkey **keyp)
1.1 djm 3860: {
3861: EVP_PKEY *pk = NULL;
3862: struct sshkey *prv = NULL;
3863: BIO *bio = NULL;
3864: int r;
3865:
1.32 djm 3866: if (keyp != NULL)
3867: *keyp = NULL;
1.1 djm 3868:
3869: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3870: return SSH_ERR_ALLOC_FAIL;
3871: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3872: (int)sshbuf_len(blob)) {
3873: r = SSH_ERR_ALLOC_FAIL;
3874: goto out;
3875: }
3876:
1.52 djm 3877: clear_libcrypto_errors();
1.1 djm 3878: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3879: (char *)passphrase)) == NULL) {
1.52 djm 3880: r = convert_libcrypto_error();
1.1 djm 3881: goto out;
3882: }
1.69 ! djm 3883: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3884: (type == KEY_UNSPEC || type == KEY_RSA)) {
3885: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3886: r = SSH_ERR_ALLOC_FAIL;
3887: goto out;
3888: }
3889: prv->rsa = EVP_PKEY_get1_RSA(pk);
3890: prv->type = KEY_RSA;
3891: #ifdef DEBUG_PK
3892: RSA_print_fp(stderr, prv->rsa, 8);
3893: #endif
3894: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3895: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3896: goto out;
3897: }
1.69 ! djm 3898: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 3899: goto out;
1.69 ! djm 3900: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3901: (type == KEY_UNSPEC || type == KEY_DSA)) {
3902: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3903: r = SSH_ERR_ALLOC_FAIL;
3904: goto out;
3905: }
3906: prv->dsa = EVP_PKEY_get1_DSA(pk);
3907: prv->type = KEY_DSA;
3908: #ifdef DEBUG_PK
3909: DSA_print_fp(stderr, prv->dsa, 8);
3910: #endif
1.69 ! djm 3911: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3912: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3913: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3914: r = SSH_ERR_ALLOC_FAIL;
3915: goto out;
3916: }
3917: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3918: prv->type = KEY_ECDSA;
3919: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3920: if (prv->ecdsa_nid == -1 ||
3921: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3922: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3923: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3924: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3925: r = SSH_ERR_INVALID_FORMAT;
3926: goto out;
3927: }
3928: #ifdef DEBUG_PK
3929: if (prv != NULL && prv->ecdsa != NULL)
3930: sshkey_dump_ec_key(prv->ecdsa);
3931: #endif
3932: } else {
3933: r = SSH_ERR_INVALID_FORMAT;
3934: goto out;
3935: }
3936: r = 0;
1.32 djm 3937: if (keyp != NULL) {
3938: *keyp = prv;
3939: prv = NULL;
3940: }
1.1 djm 3941: out:
3942: BIO_free(bio);
1.60 jsing 3943: EVP_PKEY_free(pk);
1.30 mmcc 3944: sshkey_free(prv);
1.1 djm 3945: return r;
3946: }
3947: #endif /* WITH_OPENSSL */
3948:
3949: int
3950: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3951: const char *passphrase, struct sshkey **keyp, char **commentp)
3952: {
1.42 djm 3953: int r = SSH_ERR_INTERNAL_ERROR;
3954:
1.32 djm 3955: if (keyp != NULL)
3956: *keyp = NULL;
1.1 djm 3957: if (commentp != NULL)
3958: *commentp = NULL;
3959:
3960: switch (type) {
1.9 markus 3961: #ifdef WITH_OPENSSL
1.1 djm 3962: case KEY_DSA:
3963: case KEY_ECDSA:
3964: case KEY_RSA:
1.8 djm 3965: return sshkey_parse_private_pem_fileblob(blob, type,
3966: passphrase, keyp);
1.1 djm 3967: #endif /* WITH_OPENSSL */
3968: case KEY_ED25519:
1.62 markus 3969: #ifdef WITH_XMSS
3970: case KEY_XMSS:
3971: #endif /* WITH_XMSS */
1.1 djm 3972: return sshkey_parse_private2(blob, type, passphrase,
3973: keyp, commentp);
3974: case KEY_UNSPEC:
1.42 djm 3975: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3976: commentp);
3977: /* Do not fallback to PEM parser if only passphrase is wrong. */
3978: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
3979: return r;
1.1 djm 3980: #ifdef WITH_OPENSSL
1.8 djm 3981: return sshkey_parse_private_pem_fileblob(blob, type,
3982: passphrase, keyp);
1.1 djm 3983: #else
3984: return SSH_ERR_INVALID_FORMAT;
3985: #endif /* WITH_OPENSSL */
3986: default:
3987: return SSH_ERR_KEY_TYPE_UNKNOWN;
3988: }
3989: }
3990:
3991: int
3992: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3993: struct sshkey **keyp, char **commentp)
1.1 djm 3994: {
3995: if (keyp != NULL)
3996: *keyp = NULL;
3997: if (commentp != NULL)
3998: *commentp = NULL;
3999:
1.23 tim 4000: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
4001: passphrase, keyp, commentp);
1.1 djm 4002: }
1.62 markus 4003:
4004: #ifdef WITH_XMSS
4005: /*
4006: * serialize the key with the current state and forward the state
4007: * maxsign times.
4008: */
4009: int
4010: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4011: u_int32_t maxsign, sshkey_printfn *pr)
4012: {
4013: int r, rupdate;
4014:
4015: if (maxsign == 0 ||
4016: sshkey_type_plain(k->type) != KEY_XMSS)
4017: return sshkey_private_serialize_opt(k, b,
4018: SSHKEY_SERIALIZE_DEFAULT);
4019: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4020: (r = sshkey_private_serialize_opt(k, b,
4021: SSHKEY_SERIALIZE_STATE)) != 0 ||
4022: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4023: goto out;
4024: r = 0;
4025: out:
4026: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4027: if (r == 0)
4028: r = rupdate;
4029: }
4030: return r;
4031: }
4032:
4033: u_int32_t
4034: sshkey_signatures_left(const struct sshkey *k)
4035: {
4036: if (sshkey_type_plain(k->type) == KEY_XMSS)
4037: return sshkey_xmss_signatures_left(k);
4038: return 0;
4039: }
4040:
4041: int
4042: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4043: {
4044: if (sshkey_type_plain(k->type) != KEY_XMSS)
4045: return SSH_ERR_INVALID_ARGUMENT;
4046: return sshkey_xmss_enable_maxsign(k, maxsign);
4047: }
4048:
4049: int
4050: sshkey_set_filename(struct sshkey *k, const char *filename)
4051: {
4052: if (k == NULL)
4053: return SSH_ERR_INVALID_ARGUMENT;
4054: if (sshkey_type_plain(k->type) != KEY_XMSS)
4055: return 0;
4056: if (filename == NULL)
4057: return SSH_ERR_INVALID_ARGUMENT;
4058: if ((k->xmss_filename = strdup(filename)) == NULL)
4059: return SSH_ERR_ALLOC_FAIL;
4060: return 0;
4061: }
4062: #else
4063: int
4064: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4065: u_int32_t maxsign, sshkey_printfn *pr)
4066: {
4067: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4068: }
4069:
4070: u_int32_t
4071: sshkey_signatures_left(const struct sshkey *k)
4072: {
4073: return 0;
4074: }
4075:
4076: int
4077: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4078: {
4079: return SSH_ERR_INVALID_ARGUMENT;
4080: }
4081:
4082: int
4083: sshkey_set_filename(struct sshkey *k, const char *filename)
4084: {
4085: if (k == NULL)
4086: return SSH_ERR_INVALID_ARGUMENT;
4087: return 0;
4088: }
4089: #endif /* WITH_XMSS */
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