Annotation of src/usr.bin/ssh/sshkey.c, Revision 1.72
1.72 ! djm 1: /* $OpenBSD: sshkey.c,v 1.71 2018/10/09 05:42:23 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",
1.72 ! djm 112: "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 113: { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT",
1.72 ! djm 114: "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 },
1.65 djm 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:
530: void
531: sshkey_free(struct sshkey *k)
532: {
533: if (k == NULL)
534: return;
535: switch (k->type) {
536: #ifdef WITH_OPENSSL
537: case KEY_RSA:
538: case KEY_RSA_CERT:
1.60 jsing 539: RSA_free(k->rsa);
1.1 djm 540: k->rsa = NULL;
541: break;
542: case KEY_DSA:
543: case KEY_DSA_CERT:
1.60 jsing 544: DSA_free(k->dsa);
1.1 djm 545: k->dsa = NULL;
546: break;
547: case KEY_ECDSA:
548: case KEY_ECDSA_CERT:
1.60 jsing 549: EC_KEY_free(k->ecdsa);
1.1 djm 550: k->ecdsa = NULL;
551: break;
552: #endif /* WITH_OPENSSL */
553: case KEY_ED25519:
554: case KEY_ED25519_CERT:
1.61 jsing 555: freezero(k->ed25519_pk, ED25519_PK_SZ);
556: k->ed25519_pk = NULL;
557: freezero(k->ed25519_sk, ED25519_SK_SZ);
558: k->ed25519_sk = NULL;
1.1 djm 559: break;
1.62 markus 560: #ifdef WITH_XMSS
561: case KEY_XMSS:
562: case KEY_XMSS_CERT:
563: freezero(k->xmss_pk, sshkey_xmss_pklen(k));
564: k->xmss_pk = NULL;
565: freezero(k->xmss_sk, sshkey_xmss_sklen(k));
566: k->xmss_sk = NULL;
567: sshkey_xmss_free_state(k);
568: free(k->xmss_name);
569: k->xmss_name = NULL;
570: free(k->xmss_filename);
571: k->xmss_filename = NULL;
572: break;
573: #endif /* WITH_XMSS */
1.1 djm 574: case KEY_UNSPEC:
575: break;
576: default:
577: break;
578: }
579: if (sshkey_is_cert(k))
580: cert_free(k->cert);
1.61 jsing 581: freezero(k, sizeof(*k));
1.1 djm 582: }
583:
584: static int
585: cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
586: {
587: if (a == NULL && b == NULL)
588: return 1;
589: if (a == NULL || b == NULL)
590: return 0;
591: if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
592: return 0;
593: if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
594: sshbuf_len(a->certblob)) != 0)
595: return 0;
596: return 1;
597: }
598:
599: /*
600: * Compare public portions of key only, allowing comparisons between
601: * certificates and plain keys too.
602: */
603: int
604: sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
605: {
606: #ifdef WITH_OPENSSL
607: BN_CTX *bnctx;
1.69 djm 608: const BIGNUM *rsa_e_a, *rsa_n_a;
609: const BIGNUM *rsa_e_b, *rsa_n_b;
610: const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a;
611: const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b;
1.1 djm 612: #endif /* WITH_OPENSSL */
613:
614: if (a == NULL || b == NULL ||
615: sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
616: return 0;
617:
618: switch (a->type) {
619: #ifdef WITH_OPENSSL
620: case KEY_RSA_CERT:
621: case KEY_RSA:
1.69 djm 622: if (a->rsa == NULL || b->rsa == NULL)
623: return 0;
624: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
625: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
626: return BN_cmp(rsa_e_a, rsa_e_b) == 0 &&
627: BN_cmp(rsa_n_a, rsa_n_b) == 0;
1.1 djm 628: case KEY_DSA_CERT:
629: case KEY_DSA:
1.69 djm 630: if (a->dsa == NULL || b->dsa == NULL)
631: return 0;
632: DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a);
633: DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b);
634: DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL);
635: DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL);
636: return BN_cmp(dsa_p_a, dsa_p_b) == 0 &&
637: BN_cmp(dsa_q_a, dsa_q_b) == 0 &&
638: BN_cmp(dsa_g_a, dsa_g_b) == 0 &&
639: BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0;
1.1 djm 640: case KEY_ECDSA_CERT:
641: case KEY_ECDSA:
642: if (a->ecdsa == NULL || b->ecdsa == NULL ||
643: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
644: EC_KEY_get0_public_key(b->ecdsa) == NULL)
645: return 0;
646: if ((bnctx = BN_CTX_new()) == NULL)
647: return 0;
648: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
649: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
650: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
651: EC_KEY_get0_public_key(a->ecdsa),
652: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
653: BN_CTX_free(bnctx);
654: return 0;
655: }
656: BN_CTX_free(bnctx);
657: return 1;
658: #endif /* WITH_OPENSSL */
659: case KEY_ED25519:
660: case KEY_ED25519_CERT:
661: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
662: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.62 markus 663: #ifdef WITH_XMSS
664: case KEY_XMSS:
665: case KEY_XMSS_CERT:
666: return a->xmss_pk != NULL && b->xmss_pk != NULL &&
667: sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) &&
668: memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0;
669: #endif /* WITH_XMSS */
1.1 djm 670: default:
671: return 0;
672: }
673: /* NOTREACHED */
674: }
675:
676: int
677: sshkey_equal(const struct sshkey *a, const struct sshkey *b)
678: {
679: if (a == NULL || b == NULL || a->type != b->type)
680: return 0;
681: if (sshkey_is_cert(a)) {
682: if (!cert_compare(a->cert, b->cert))
683: return 0;
684: }
685: return sshkey_equal_public(a, b);
686: }
687:
688: static int
1.62 markus 689: to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
690: enum sshkey_serialize_rep opts)
1.1 djm 691: {
692: int type, ret = SSH_ERR_INTERNAL_ERROR;
693: const char *typename;
1.69 djm 694: #ifdef WITH_OPENSSL
695: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
696: #endif /* WITH_OPENSSL */
1.1 djm 697:
698: if (key == NULL)
699: return SSH_ERR_INVALID_ARGUMENT;
700:
1.19 djm 701: if (sshkey_is_cert(key)) {
702: if (key->cert == NULL)
703: return SSH_ERR_EXPECTED_CERT;
704: if (sshbuf_len(key->cert->certblob) == 0)
705: return SSH_ERR_KEY_LACKS_CERTBLOB;
706: }
1.1 djm 707: type = force_plain ? sshkey_type_plain(key->type) : key->type;
708: typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
709:
710: switch (type) {
711: #ifdef WITH_OPENSSL
712: case KEY_DSA_CERT:
713: case KEY_ECDSA_CERT:
714: case KEY_RSA_CERT:
715: #endif /* WITH_OPENSSL */
716: case KEY_ED25519_CERT:
1.62 markus 717: #ifdef WITH_XMSS
718: case KEY_XMSS_CERT:
719: #endif /* WITH_XMSS */
1.1 djm 720: /* Use the existing blob */
721: /* XXX modified flag? */
722: if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
723: return ret;
724: break;
725: #ifdef WITH_OPENSSL
726: case KEY_DSA:
727: if (key->dsa == NULL)
728: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 729: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
730: DSA_get0_key(key->dsa, &dsa_pub_key, NULL);
1.1 djm 731: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 732: (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
733: (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
734: (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
735: (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0)
1.1 djm 736: return ret;
737: break;
738: case KEY_ECDSA:
739: if (key->ecdsa == NULL)
740: return SSH_ERR_INVALID_ARGUMENT;
741: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
742: (ret = sshbuf_put_cstring(b,
743: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
744: (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
745: return ret;
746: break;
747: case KEY_RSA:
748: if (key->rsa == NULL)
749: return SSH_ERR_INVALID_ARGUMENT;
1.69 djm 750: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
1.1 djm 751: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
1.69 djm 752: (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
753: (ret = sshbuf_put_bignum2(b, rsa_n)) != 0)
1.1 djm 754: return ret;
755: break;
756: #endif /* WITH_OPENSSL */
757: case KEY_ED25519:
758: if (key->ed25519_pk == NULL)
759: return SSH_ERR_INVALID_ARGUMENT;
760: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
761: (ret = sshbuf_put_string(b,
762: key->ed25519_pk, ED25519_PK_SZ)) != 0)
763: return ret;
764: break;
1.62 markus 765: #ifdef WITH_XMSS
766: case KEY_XMSS:
767: if (key->xmss_name == NULL || key->xmss_pk == NULL ||
768: sshkey_xmss_pklen(key) == 0)
769: return SSH_ERR_INVALID_ARGUMENT;
770: if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
771: (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
772: (ret = sshbuf_put_string(b,
773: key->xmss_pk, sshkey_xmss_pklen(key))) != 0 ||
774: (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0)
775: return ret;
776: break;
777: #endif /* WITH_XMSS */
1.1 djm 778: default:
779: return SSH_ERR_KEY_TYPE_UNKNOWN;
780: }
781: return 0;
782: }
783:
784: int
1.14 djm 785: sshkey_putb(const struct sshkey *key, struct sshbuf *b)
1.1 djm 786: {
1.62 markus 787: return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 788: }
789:
790: int
1.62 markus 791: sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
792: enum sshkey_serialize_rep opts)
1.14 djm 793: {
794: struct sshbuf *tmp;
795: int r;
796:
797: if ((tmp = sshbuf_new()) == NULL)
798: return SSH_ERR_ALLOC_FAIL;
1.62 markus 799: r = to_blob_buf(key, tmp, 0, opts);
1.14 djm 800: if (r == 0)
801: r = sshbuf_put_stringb(b, tmp);
802: sshbuf_free(tmp);
803: return r;
804: }
805:
806: int
1.62 markus 807: sshkey_puts(const struct sshkey *key, struct sshbuf *b)
808: {
809: return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
810: }
811:
812: int
1.14 djm 813: sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
1.1 djm 814: {
1.62 markus 815: return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 816: }
817:
818: static int
1.62 markus 819: to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
820: enum sshkey_serialize_rep opts)
1.1 djm 821: {
822: int ret = SSH_ERR_INTERNAL_ERROR;
823: size_t len;
824: struct sshbuf *b = NULL;
825:
826: if (lenp != NULL)
827: *lenp = 0;
828: if (blobp != NULL)
829: *blobp = NULL;
830: if ((b = sshbuf_new()) == NULL)
831: return SSH_ERR_ALLOC_FAIL;
1.62 markus 832: if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
1.1 djm 833: goto out;
834: len = sshbuf_len(b);
835: if (lenp != NULL)
836: *lenp = len;
837: if (blobp != NULL) {
838: if ((*blobp = malloc(len)) == NULL) {
839: ret = SSH_ERR_ALLOC_FAIL;
840: goto out;
841: }
842: memcpy(*blobp, sshbuf_ptr(b), len);
843: }
844: ret = 0;
845: out:
846: sshbuf_free(b);
847: return ret;
848: }
849:
850: int
851: sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
852: {
1.62 markus 853: return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 854: }
855:
856: int
857: sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
858: {
1.62 markus 859: return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
1.1 djm 860: }
861:
862: int
1.7 djm 863: sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
1.1 djm 864: u_char **retp, size_t *lenp)
865: {
866: u_char *blob = NULL, *ret = NULL;
867: size_t blob_len = 0;
1.7 djm 868: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 869:
870: if (retp != NULL)
871: *retp = NULL;
872: if (lenp != NULL)
873: *lenp = 0;
1.7 djm 874: if (ssh_digest_bytes(dgst_alg) == 0) {
1.1 djm 875: r = SSH_ERR_INVALID_ARGUMENT;
876: goto out;
877: }
1.62 markus 878: if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
879: != 0)
1.1 djm 880: goto out;
881: if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
882: r = SSH_ERR_ALLOC_FAIL;
883: goto out;
884: }
1.7 djm 885: if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
1.1 djm 886: ret, SSH_DIGEST_MAX_LENGTH)) != 0)
887: goto out;
888: /* success */
889: if (retp != NULL) {
890: *retp = ret;
891: ret = NULL;
892: }
893: if (lenp != NULL)
1.7 djm 894: *lenp = ssh_digest_bytes(dgst_alg);
1.1 djm 895: r = 0;
896: out:
897: free(ret);
898: if (blob != NULL) {
899: explicit_bzero(blob, blob_len);
900: free(blob);
901: }
902: return r;
903: }
904:
905: static char *
1.7 djm 906: fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
907: {
908: char *ret;
909: size_t plen = strlen(alg) + 1;
910: size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
911: int r;
912:
913: if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
914: return NULL;
915: strlcpy(ret, alg, rlen);
916: strlcat(ret, ":", rlen);
917: if (dgst_raw_len == 0)
918: return ret;
919: if ((r = b64_ntop(dgst_raw, dgst_raw_len,
920: ret + plen, rlen - plen)) == -1) {
1.61 jsing 921: freezero(ret, rlen);
1.7 djm 922: return NULL;
923: }
924: /* Trim padding characters from end */
925: ret[strcspn(ret, "=")] = '\0';
926: return ret;
927: }
928:
929: static char *
930: fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
1.1 djm 931: {
1.7 djm 932: char *retval, hex[5];
933: size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
1.1 djm 934:
1.7 djm 935: if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
1.1 djm 936: return NULL;
1.7 djm 937: strlcpy(retval, alg, rlen);
938: strlcat(retval, ":", rlen);
1.1 djm 939: for (i = 0; i < dgst_raw_len; i++) {
1.7 djm 940: snprintf(hex, sizeof(hex), "%s%02x",
941: i > 0 ? ":" : "", dgst_raw[i]);
942: strlcat(retval, hex, rlen);
1.1 djm 943: }
944: return retval;
945: }
946:
947: static char *
948: fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
949: {
950: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
951: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
952: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
953: u_int i, j = 0, rounds, seed = 1;
954: char *retval;
955:
956: rounds = (dgst_raw_len / 2) + 1;
957: if ((retval = calloc(rounds, 6)) == NULL)
958: return NULL;
959: retval[j++] = 'x';
960: for (i = 0; i < rounds; i++) {
961: u_int idx0, idx1, idx2, idx3, idx4;
962: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
963: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
964: seed) % 6;
965: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
966: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
967: (seed / 6)) % 6;
968: retval[j++] = vowels[idx0];
969: retval[j++] = consonants[idx1];
970: retval[j++] = vowels[idx2];
971: if ((i + 1) < rounds) {
972: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
973: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
974: retval[j++] = consonants[idx3];
975: retval[j++] = '-';
976: retval[j++] = consonants[idx4];
977: seed = ((seed * 5) +
978: ((((u_int)(dgst_raw[2 * i])) * 7) +
979: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
980: }
981: } else {
982: idx0 = seed % 6;
983: idx1 = 16;
984: idx2 = seed / 6;
985: retval[j++] = vowels[idx0];
986: retval[j++] = consonants[idx1];
987: retval[j++] = vowels[idx2];
988: }
989: }
990: retval[j++] = 'x';
991: retval[j++] = '\0';
992: return retval;
993: }
994:
995: /*
996: * Draw an ASCII-Art representing the fingerprint so human brain can
997: * profit from its built-in pattern recognition ability.
998: * This technique is called "random art" and can be found in some
999: * scientific publications like this original paper:
1000: *
1001: * "Hash Visualization: a New Technique to improve Real-World Security",
1002: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1003: * Techniques and E-Commerce (CrypTEC '99)
1004: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1005: *
1006: * The subject came up in a talk by Dan Kaminsky, too.
1007: *
1008: * If you see the picture is different, the key is different.
1009: * If the picture looks the same, you still know nothing.
1010: *
1011: * The algorithm used here is a worm crawling over a discrete plane,
1012: * leaving a trace (augmenting the field) everywhere it goes.
1013: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1014: * makes the respective movement vector be ignored for this turn.
1015: * Graphs are not unambiguous, because circles in graphs can be
1016: * walked in either direction.
1017: */
1018:
1019: /*
1020: * Field sizes for the random art. Have to be odd, so the starting point
1021: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1022: * Else pictures would be too dense, and drawing the frame would
1023: * fail, too, because the key type would not fit in anymore.
1024: */
1025: #define FLDBASE 8
1026: #define FLDSIZE_Y (FLDBASE + 1)
1027: #define FLDSIZE_X (FLDBASE * 2 + 1)
1028: static char *
1.7 djm 1029: fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1.1 djm 1030: const struct sshkey *k)
1031: {
1032: /*
1033: * Chars to be used after each other every time the worm
1034: * intersects with itself. Matter of taste.
1035: */
1036: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.7 djm 1037: char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1.1 djm 1038: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.7 djm 1039: size_t i, tlen, hlen;
1.1 djm 1040: u_int b;
1.3 djm 1041: int x, y, r;
1.1 djm 1042: size_t len = strlen(augmentation_string) - 1;
1043:
1044: if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1045: return NULL;
1046:
1047: /* initialize field */
1048: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1049: x = FLDSIZE_X / 2;
1050: y = FLDSIZE_Y / 2;
1051:
1052: /* process raw key */
1053: for (i = 0; i < dgst_raw_len; i++) {
1054: int input;
1055: /* each byte conveys four 2-bit move commands */
1056: input = dgst_raw[i];
1057: for (b = 0; b < 4; b++) {
1058: /* evaluate 2 bit, rest is shifted later */
1059: x += (input & 0x1) ? 1 : -1;
1060: y += (input & 0x2) ? 1 : -1;
1061:
1062: /* assure we are still in bounds */
1.37 deraadt 1063: x = MAXIMUM(x, 0);
1064: y = MAXIMUM(y, 0);
1065: x = MINIMUM(x, FLDSIZE_X - 1);
1066: y = MINIMUM(y, FLDSIZE_Y - 1);
1.1 djm 1067:
1068: /* augment the field */
1069: if (field[x][y] < len - 2)
1070: field[x][y]++;
1071: input = input >> 2;
1072: }
1073: }
1074:
1075: /* mark starting point and end point*/
1076: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1077: field[x][y] = len;
1078:
1.3 djm 1079: /* assemble title */
1080: r = snprintf(title, sizeof(title), "[%s %u]",
1081: sshkey_type(k), sshkey_size(k));
1082: /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1083: if (r < 0 || r > (int)sizeof(title))
1.7 djm 1084: r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1085: tlen = (r <= 0) ? 0 : strlen(title);
1086:
1087: /* assemble hash ID. */
1088: r = snprintf(hash, sizeof(hash), "[%s]", alg);
1089: hlen = (r <= 0) ? 0 : strlen(hash);
1.1 djm 1090:
1091: /* output upper border */
1.3 djm 1092: p = retval;
1093: *p++ = '+';
1094: for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1095: *p++ = '-';
1096: memcpy(p, title, tlen);
1097: p += tlen;
1.7 djm 1098: for (i += tlen; i < FLDSIZE_X; i++)
1.1 djm 1099: *p++ = '-';
1100: *p++ = '+';
1101: *p++ = '\n';
1102:
1103: /* output content */
1104: for (y = 0; y < FLDSIZE_Y; y++) {
1105: *p++ = '|';
1106: for (x = 0; x < FLDSIZE_X; x++)
1.37 deraadt 1107: *p++ = augmentation_string[MINIMUM(field[x][y], len)];
1.1 djm 1108: *p++ = '|';
1109: *p++ = '\n';
1110: }
1111:
1112: /* output lower border */
1113: *p++ = '+';
1.7 djm 1114: for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1115: *p++ = '-';
1116: memcpy(p, hash, hlen);
1117: p += hlen;
1118: for (i += hlen; i < FLDSIZE_X; i++)
1.1 djm 1119: *p++ = '-';
1120: *p++ = '+';
1121:
1122: return retval;
1123: }
1124:
1125: char *
1.7 djm 1126: sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1.1 djm 1127: enum sshkey_fp_rep dgst_rep)
1128: {
1129: char *retval = NULL;
1130: u_char *dgst_raw;
1131: size_t dgst_raw_len;
1132:
1.7 djm 1133: if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1.1 djm 1134: return NULL;
1135: switch (dgst_rep) {
1.7 djm 1136: case SSH_FP_DEFAULT:
1137: if (dgst_alg == SSH_DIGEST_MD5) {
1138: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1139: dgst_raw, dgst_raw_len);
1140: } else {
1141: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1142: dgst_raw, dgst_raw_len);
1143: }
1144: break;
1.1 djm 1145: case SSH_FP_HEX:
1.7 djm 1146: retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1147: dgst_raw, dgst_raw_len);
1148: break;
1149: case SSH_FP_BASE64:
1150: retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1151: dgst_raw, dgst_raw_len);
1.1 djm 1152: break;
1153: case SSH_FP_BUBBLEBABBLE:
1154: retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1155: break;
1156: case SSH_FP_RANDOMART:
1.7 djm 1157: retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1158: dgst_raw, dgst_raw_len, k);
1.1 djm 1159: break;
1160: default:
1161: explicit_bzero(dgst_raw, dgst_raw_len);
1162: free(dgst_raw);
1163: return NULL;
1164: }
1165: explicit_bzero(dgst_raw, dgst_raw_len);
1166: free(dgst_raw);
1167: return retval;
1168: }
1169:
1.63 djm 1170: static int
1171: peek_type_nid(const char *s, size_t l, int *nid)
1172: {
1173: const struct keytype *kt;
1174:
1175: for (kt = keytypes; kt->type != -1; kt++) {
1176: if (kt->name == NULL || strlen(kt->name) != l)
1177: continue;
1178: if (memcmp(s, kt->name, l) == 0) {
1179: *nid = -1;
1180: if (kt->type == KEY_ECDSA || kt->type == KEY_ECDSA_CERT)
1181: *nid = kt->nid;
1182: return kt->type;
1183: }
1184: }
1185: return KEY_UNSPEC;
1186: }
1187:
1.1 djm 1188:
1.63 djm 1189: /* XXX this can now be made const char * */
1.1 djm 1190: int
1191: sshkey_read(struct sshkey *ret, char **cpp)
1192: {
1193: struct sshkey *k;
1.63 djm 1194: char *cp, *blobcopy;
1195: size_t space;
1.1 djm 1196: int r, type, curve_nid = -1;
1197: struct sshbuf *blob;
1.44 dtucker 1198:
1199: if (ret == NULL)
1200: return SSH_ERR_INVALID_ARGUMENT;
1.1 djm 1201:
1202: switch (ret->type) {
1203: case KEY_UNSPEC:
1204: case KEY_RSA:
1205: case KEY_DSA:
1206: case KEY_ECDSA:
1207: case KEY_ED25519:
1208: case KEY_DSA_CERT:
1209: case KEY_ECDSA_CERT:
1210: case KEY_RSA_CERT:
1211: case KEY_ED25519_CERT:
1.62 markus 1212: #ifdef WITH_XMSS
1213: case KEY_XMSS:
1214: case KEY_XMSS_CERT:
1215: #endif /* WITH_XMSS */
1.63 djm 1216: break; /* ok */
1217: default:
1218: return SSH_ERR_INVALID_ARGUMENT;
1219: }
1220:
1221: /* Decode type */
1222: cp = *cpp;
1223: space = strcspn(cp, " \t");
1224: if (space == strlen(cp))
1225: return SSH_ERR_INVALID_FORMAT;
1226: if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1227: return SSH_ERR_INVALID_FORMAT;
1228:
1229: /* skip whitespace */
1230: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1231: ;
1232: if (*cp == '\0')
1233: return SSH_ERR_INVALID_FORMAT;
1234: if (ret->type != KEY_UNSPEC && ret->type != type)
1235: return SSH_ERR_KEY_TYPE_MISMATCH;
1236: if ((blob = sshbuf_new()) == NULL)
1237: return SSH_ERR_ALLOC_FAIL;
1238:
1239: /* find end of keyblob and decode */
1240: space = strcspn(cp, " \t");
1241: if ((blobcopy = strndup(cp, space)) == NULL) {
1242: sshbuf_free(blob);
1243: return SSH_ERR_ALLOC_FAIL;
1244: }
1245: if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1246: free(blobcopy);
1247: sshbuf_free(blob);
1248: return r;
1249: }
1250: free(blobcopy);
1251: if ((r = sshkey_fromb(blob, &k)) != 0) {
1.1 djm 1252: sshbuf_free(blob);
1.63 djm 1253: return r;
1254: }
1255: sshbuf_free(blob);
1256:
1257: /* skip whitespace and leave cp at start of comment */
1258: for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
1259: ;
1260:
1261: /* ensure type of blob matches type at start of line */
1262: if (k->type != type) {
1263: sshkey_free(k);
1264: return SSH_ERR_KEY_TYPE_MISMATCH;
1265: }
1266: if (sshkey_type_plain(type) == KEY_ECDSA && curve_nid != k->ecdsa_nid) {
1267: sshkey_free(k);
1268: return SSH_ERR_EC_CURVE_MISMATCH;
1269: }
1270:
1271: /* Fill in ret from parsed key */
1272: ret->type = type;
1273: if (sshkey_is_cert(ret)) {
1274: if (!sshkey_is_cert(k)) {
1.1 djm 1275: sshkey_free(k);
1.63 djm 1276: return SSH_ERR_EXPECTED_CERT;
1.1 djm 1277: }
1.63 djm 1278: if (ret->cert != NULL)
1279: cert_free(ret->cert);
1280: ret->cert = k->cert;
1281: k->cert = NULL;
1282: }
1283: switch (sshkey_type_plain(ret->type)) {
1.1 djm 1284: #ifdef WITH_OPENSSL
1.63 djm 1285: case KEY_RSA:
1286: RSA_free(ret->rsa);
1287: ret->rsa = k->rsa;
1288: k->rsa = NULL;
1.1 djm 1289: #ifdef DEBUG_PK
1.63 djm 1290: RSA_print_fp(stderr, ret->rsa, 8);
1.1 djm 1291: #endif
1.63 djm 1292: break;
1293: case KEY_DSA:
1294: DSA_free(ret->dsa);
1295: ret->dsa = k->dsa;
1296: k->dsa = NULL;
1.1 djm 1297: #ifdef DEBUG_PK
1.63 djm 1298: DSA_print_fp(stderr, ret->dsa, 8);
1.1 djm 1299: #endif
1.63 djm 1300: break;
1301: case KEY_ECDSA:
1302: EC_KEY_free(ret->ecdsa);
1303: ret->ecdsa = k->ecdsa;
1304: ret->ecdsa_nid = k->ecdsa_nid;
1305: k->ecdsa = NULL;
1306: k->ecdsa_nid = -1;
1.1 djm 1307: #ifdef DEBUG_PK
1.63 djm 1308: sshkey_dump_ec_key(ret->ecdsa);
1.1 djm 1309: #endif
1.63 djm 1310: break;
1.1 djm 1311: #endif /* WITH_OPENSSL */
1.63 djm 1312: case KEY_ED25519:
1313: freezero(ret->ed25519_pk, ED25519_PK_SZ);
1314: ret->ed25519_pk = k->ed25519_pk;
1315: k->ed25519_pk = NULL;
1.1 djm 1316: #ifdef DEBUG_PK
1.63 djm 1317: /* XXX */
1.1 djm 1318: #endif
1.63 djm 1319: break;
1.62 markus 1320: #ifdef WITH_XMSS
1.63 djm 1321: case KEY_XMSS:
1322: free(ret->xmss_pk);
1323: ret->xmss_pk = k->xmss_pk;
1324: k->xmss_pk = NULL;
1325: free(ret->xmss_state);
1326: ret->xmss_state = k->xmss_state;
1327: k->xmss_state = NULL;
1328: free(ret->xmss_name);
1329: ret->xmss_name = k->xmss_name;
1330: k->xmss_name = NULL;
1331: free(ret->xmss_filename);
1332: ret->xmss_filename = k->xmss_filename;
1333: k->xmss_filename = NULL;
1.62 markus 1334: #ifdef DEBUG_PK
1.63 djm 1335: /* XXX */
1.62 markus 1336: #endif
1.63 djm 1337: break;
1.62 markus 1338: #endif /* WITH_XMSS */
1.63 djm 1339: default:
1.1 djm 1340: sshkey_free(k);
1.63 djm 1341: return SSH_ERR_INTERNAL_ERROR;
1.1 djm 1342: }
1.63 djm 1343: sshkey_free(k);
1344:
1345: /* success */
1346: *cpp = cp;
1347: return 0;
1.1 djm 1348: }
1349:
1350: int
1.19 djm 1351: sshkey_to_base64(const struct sshkey *key, char **b64p)
1.1 djm 1352: {
1.19 djm 1353: int r = SSH_ERR_INTERNAL_ERROR;
1354: struct sshbuf *b = NULL;
1.1 djm 1355: char *uu = NULL;
1.19 djm 1356:
1357: if (b64p != NULL)
1358: *b64p = NULL;
1359: if ((b = sshbuf_new()) == NULL)
1360: return SSH_ERR_ALLOC_FAIL;
1361: if ((r = sshkey_putb(key, b)) != 0)
1362: goto out;
1363: if ((uu = sshbuf_dtob64(b)) == NULL) {
1364: r = SSH_ERR_ALLOC_FAIL;
1365: goto out;
1366: }
1367: /* Success */
1368: if (b64p != NULL) {
1369: *b64p = uu;
1370: uu = NULL;
1371: }
1372: r = 0;
1373: out:
1374: sshbuf_free(b);
1375: free(uu);
1376: return r;
1377: }
1378:
1.52 djm 1379: int
1.19 djm 1380: sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1381: {
1382: int r = SSH_ERR_INTERNAL_ERROR;
1383: char *uu = NULL;
1384:
1.48 djm 1385: if ((r = sshkey_to_base64(key, &uu)) != 0)
1386: goto out;
1387: if ((r = sshbuf_putf(b, "%s %s",
1388: sshkey_ssh_name(key), uu)) != 0)
1389: goto out;
1.19 djm 1390: r = 0;
1391: out:
1392: free(uu);
1393: return r;
1394: }
1395:
1396: int
1397: sshkey_write(const struct sshkey *key, FILE *f)
1398: {
1399: struct sshbuf *b = NULL;
1400: int r = SSH_ERR_INTERNAL_ERROR;
1401:
1402: if ((b = sshbuf_new()) == NULL)
1403: return SSH_ERR_ALLOC_FAIL;
1404: if ((r = sshkey_format_text(key, b)) != 0)
1.1 djm 1405: goto out;
1406: if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1407: if (feof(f))
1408: errno = EPIPE;
1.19 djm 1409: r = SSH_ERR_SYSTEM_ERROR;
1.1 djm 1410: goto out;
1411: }
1.19 djm 1412: /* Success */
1413: r = 0;
1.1 djm 1414: out:
1.19 djm 1415: sshbuf_free(b);
1416: return r;
1.1 djm 1417: }
1418:
1419: const char *
1420: sshkey_cert_type(const struct sshkey *k)
1421: {
1422: switch (k->cert->type) {
1423: case SSH2_CERT_TYPE_USER:
1424: return "user";
1425: case SSH2_CERT_TYPE_HOST:
1426: return "host";
1427: default:
1428: return "unknown";
1429: }
1430: }
1431:
1432: #ifdef WITH_OPENSSL
1433: static int
1434: rsa_generate_private_key(u_int bits, RSA **rsap)
1435: {
1436: RSA *private = NULL;
1437: BIGNUM *f4 = NULL;
1438: int ret = SSH_ERR_INTERNAL_ERROR;
1439:
1.49 djm 1440: if (rsap == NULL)
1441: return SSH_ERR_INVALID_ARGUMENT;
1442: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1.1 djm 1443: bits > SSHBUF_MAX_BIGNUM * 8)
1.49 djm 1444: return SSH_ERR_KEY_LENGTH;
1.1 djm 1445: *rsap = NULL;
1446: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1447: ret = SSH_ERR_ALLOC_FAIL;
1448: goto out;
1449: }
1450: if (!BN_set_word(f4, RSA_F4) ||
1451: !RSA_generate_key_ex(private, bits, f4, NULL)) {
1452: ret = SSH_ERR_LIBCRYPTO_ERROR;
1453: goto out;
1454: }
1455: *rsap = private;
1456: private = NULL;
1457: ret = 0;
1458: out:
1.60 jsing 1459: RSA_free(private);
1460: BN_free(f4);
1.1 djm 1461: return ret;
1462: }
1463:
1464: static int
1465: dsa_generate_private_key(u_int bits, DSA **dsap)
1466: {
1467: DSA *private;
1468: int ret = SSH_ERR_INTERNAL_ERROR;
1469:
1.49 djm 1470: if (dsap == NULL)
1.1 djm 1471: return SSH_ERR_INVALID_ARGUMENT;
1.49 djm 1472: if (bits != 1024)
1473: return SSH_ERR_KEY_LENGTH;
1.1 djm 1474: if ((private = DSA_new()) == NULL) {
1475: ret = SSH_ERR_ALLOC_FAIL;
1476: goto out;
1477: }
1478: *dsap = NULL;
1479: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1480: NULL, NULL) || !DSA_generate_key(private)) {
1481: ret = SSH_ERR_LIBCRYPTO_ERROR;
1482: goto out;
1483: }
1484: *dsap = private;
1485: private = NULL;
1486: ret = 0;
1487: out:
1.60 jsing 1488: DSA_free(private);
1.1 djm 1489: return ret;
1490: }
1491:
1492: int
1493: sshkey_ecdsa_key_to_nid(EC_KEY *k)
1494: {
1495: EC_GROUP *eg;
1496: int nids[] = {
1497: NID_X9_62_prime256v1,
1498: NID_secp384r1,
1499: NID_secp521r1,
1500: -1
1501: };
1502: int nid;
1503: u_int i;
1504: BN_CTX *bnctx;
1505: const EC_GROUP *g = EC_KEY_get0_group(k);
1506:
1507: /*
1508: * The group may be stored in a ASN.1 encoded private key in one of two
1509: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1510: * or explicit group parameters encoded into the key blob. Only the
1511: * "named group" case sets the group NID for us, but we can figure
1512: * it out for the other case by comparing against all the groups that
1513: * are supported.
1514: */
1515: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1516: return nid;
1517: if ((bnctx = BN_CTX_new()) == NULL)
1518: return -1;
1519: for (i = 0; nids[i] != -1; i++) {
1520: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1521: BN_CTX_free(bnctx);
1522: return -1;
1523: }
1524: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1525: break;
1526: EC_GROUP_free(eg);
1527: }
1528: BN_CTX_free(bnctx);
1529: if (nids[i] != -1) {
1530: /* Use the group with the NID attached */
1531: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1532: if (EC_KEY_set_group(k, eg) != 1) {
1533: EC_GROUP_free(eg);
1534: return -1;
1535: }
1536: }
1537: return nids[i];
1538: }
1539:
1540: static int
1541: ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1542: {
1543: EC_KEY *private;
1544: int ret = SSH_ERR_INTERNAL_ERROR;
1545:
1.50 djm 1546: if (nid == NULL || ecdsap == NULL)
1.1 djm 1547: return SSH_ERR_INVALID_ARGUMENT;
1.50 djm 1548: if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1549: return SSH_ERR_KEY_LENGTH;
1.1 djm 1550: *ecdsap = NULL;
1551: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1552: ret = SSH_ERR_ALLOC_FAIL;
1553: goto out;
1554: }
1555: if (EC_KEY_generate_key(private) != 1) {
1556: ret = SSH_ERR_LIBCRYPTO_ERROR;
1557: goto out;
1558: }
1559: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1560: *ecdsap = private;
1561: private = NULL;
1562: ret = 0;
1563: out:
1.60 jsing 1564: EC_KEY_free(private);
1.1 djm 1565: return ret;
1566: }
1567: #endif /* WITH_OPENSSL */
1568:
1569: int
1570: sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1571: {
1572: struct sshkey *k;
1573: int ret = SSH_ERR_INTERNAL_ERROR;
1574:
1575: if (keyp == NULL)
1576: return SSH_ERR_INVALID_ARGUMENT;
1577: *keyp = NULL;
1578: if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1579: return SSH_ERR_ALLOC_FAIL;
1580: switch (type) {
1581: case KEY_ED25519:
1582: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1583: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1584: ret = SSH_ERR_ALLOC_FAIL;
1585: break;
1586: }
1587: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1588: ret = 0;
1589: break;
1.62 markus 1590: #ifdef WITH_XMSS
1591: case KEY_XMSS:
1592: ret = sshkey_xmss_generate_private_key(k, bits);
1593: break;
1594: #endif /* WITH_XMSS */
1.1 djm 1595: #ifdef WITH_OPENSSL
1596: case KEY_DSA:
1597: ret = dsa_generate_private_key(bits, &k->dsa);
1598: break;
1599: case KEY_ECDSA:
1600: ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1601: &k->ecdsa);
1602: break;
1603: case KEY_RSA:
1604: ret = rsa_generate_private_key(bits, &k->rsa);
1605: break;
1606: #endif /* WITH_OPENSSL */
1607: default:
1608: ret = SSH_ERR_INVALID_ARGUMENT;
1609: }
1610: if (ret == 0) {
1611: k->type = type;
1612: *keyp = k;
1613: } else
1614: sshkey_free(k);
1615: return ret;
1616: }
1617:
1618: int
1619: sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1620: {
1621: u_int i;
1622: const struct sshkey_cert *from;
1623: struct sshkey_cert *to;
1.67 djm 1624: int r = SSH_ERR_INTERNAL_ERROR;
1.1 djm 1625:
1.67 djm 1626: if (to_key == NULL || (from = from_key->cert) == NULL)
1.1 djm 1627: return SSH_ERR_INVALID_ARGUMENT;
1628:
1.67 djm 1629: if ((to = cert_new()) == NULL)
1.1 djm 1630: return SSH_ERR_ALLOC_FAIL;
1631:
1.67 djm 1632: if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1633: (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
1634: (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1635: goto out;
1.1 djm 1636:
1637: to->serial = from->serial;
1638: to->type = from->type;
1639: if (from->key_id == NULL)
1640: to->key_id = NULL;
1.67 djm 1641: else if ((to->key_id = strdup(from->key_id)) == NULL) {
1642: r = SSH_ERR_ALLOC_FAIL;
1643: goto out;
1644: }
1.1 djm 1645: to->valid_after = from->valid_after;
1646: to->valid_before = from->valid_before;
1647: if (from->signature_key == NULL)
1648: to->signature_key = NULL;
1.67 djm 1649: else if ((r = sshkey_from_private(from->signature_key,
1.1 djm 1650: &to->signature_key)) != 0)
1.67 djm 1651: goto out;
1652: if (from->signature_type != NULL &&
1653: (to->signature_type = strdup(from->signature_type)) == NULL) {
1654: r = SSH_ERR_ALLOC_FAIL;
1655: goto out;
1656: }
1657: if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
1658: r = SSH_ERR_INVALID_ARGUMENT;
1659: goto out;
1660: }
1.1 djm 1661: if (from->nprincipals > 0) {
1662: if ((to->principals = calloc(from->nprincipals,
1.67 djm 1663: sizeof(*to->principals))) == NULL) {
1664: r = SSH_ERR_ALLOC_FAIL;
1665: goto out;
1666: }
1.1 djm 1667: for (i = 0; i < from->nprincipals; i++) {
1668: to->principals[i] = strdup(from->principals[i]);
1669: if (to->principals[i] == NULL) {
1670: to->nprincipals = i;
1.67 djm 1671: r = SSH_ERR_ALLOC_FAIL;
1672: goto out;
1.1 djm 1673: }
1674: }
1675: }
1676: to->nprincipals = from->nprincipals;
1.67 djm 1677:
1678: /* success */
1679: cert_free(to_key->cert);
1680: to_key->cert = to;
1681: to = NULL;
1682: r = 0;
1683: out:
1684: cert_free(to);
1685: return r;
1.1 djm 1686: }
1687:
1688: int
1689: sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1690: {
1691: struct sshkey *n = NULL;
1.69 djm 1692: int r = SSH_ERR_INTERNAL_ERROR;
1693: #ifdef WITH_OPENSSL
1694: const BIGNUM *rsa_n, *rsa_e;
1695: BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
1696: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
1697: BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL;
1698: BIGNUM *dsa_pub_key_dup = NULL;
1699: #endif /* WITH_OPENSSL */
1.1 djm 1700:
1.24 djm 1701: *pkp = NULL;
1.1 djm 1702: switch (k->type) {
1703: #ifdef WITH_OPENSSL
1704: case KEY_DSA:
1705: case KEY_DSA_CERT:
1.69 djm 1706: if ((n = sshkey_new(k->type)) == NULL) {
1707: r = SSH_ERR_ALLOC_FAIL;
1708: goto out;
1709: }
1710:
1711: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
1712: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
1713: if ((dsa_p_dup = BN_dup(dsa_p)) == NULL ||
1714: (dsa_q_dup = BN_dup(dsa_q)) == NULL ||
1715: (dsa_g_dup = BN_dup(dsa_g)) == NULL ||
1716: (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) {
1717: r = SSH_ERR_ALLOC_FAIL;
1718: goto out;
1719: }
1720: if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) {
1721: r = SSH_ERR_LIBCRYPTO_ERROR;
1722: goto out;
1.1 djm 1723: }
1.69 djm 1724: dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */
1725: if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) {
1726: r = SSH_ERR_LIBCRYPTO_ERROR;
1727: goto out;
1728: }
1729: dsa_pub_key_dup = NULL; /* transferred */
1730:
1.1 djm 1731: break;
1732: case KEY_ECDSA:
1733: case KEY_ECDSA_CERT:
1.69 djm 1734: if ((n = sshkey_new(k->type)) == NULL) {
1735: r = SSH_ERR_ALLOC_FAIL;
1736: goto out;
1737: }
1.1 djm 1738: n->ecdsa_nid = k->ecdsa_nid;
1739: n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1740: if (n->ecdsa == NULL) {
1.69 djm 1741: r = SSH_ERR_ALLOC_FAIL;
1742: goto out;
1.1 djm 1743: }
1744: if (EC_KEY_set_public_key(n->ecdsa,
1745: EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1.69 djm 1746: r = SSH_ERR_LIBCRYPTO_ERROR;
1747: goto out;
1.1 djm 1748: }
1749: break;
1750: case KEY_RSA:
1751: case KEY_RSA_CERT:
1.69 djm 1752: if ((n = sshkey_new(k->type)) == NULL) {
1753: r = SSH_ERR_ALLOC_FAIL;
1754: goto out;
1.1 djm 1755: }
1.69 djm 1756: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
1757: if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
1758: (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
1759: r = SSH_ERR_ALLOC_FAIL;
1760: goto out;
1761: }
1762: if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) {
1763: r = SSH_ERR_LIBCRYPTO_ERROR;
1764: goto out;
1765: }
1766: rsa_n_dup = rsa_e_dup = NULL; /* transferred */
1.1 djm 1767: break;
1768: #endif /* WITH_OPENSSL */
1769: case KEY_ED25519:
1770: case KEY_ED25519_CERT:
1.69 djm 1771: if ((n = sshkey_new(k->type)) == NULL) {
1772: r = SSH_ERR_ALLOC_FAIL;
1773: goto out;
1774: }
1.1 djm 1775: if (k->ed25519_pk != NULL) {
1776: if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1.69 djm 1777: r = SSH_ERR_ALLOC_FAIL;
1778: goto out;
1.1 djm 1779: }
1780: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1781: }
1782: break;
1.62 markus 1783: #ifdef WITH_XMSS
1784: case KEY_XMSS:
1785: case KEY_XMSS_CERT:
1.69 djm 1786: if ((n = sshkey_new(k->type)) == NULL) {
1787: r = SSH_ERR_ALLOC_FAIL;
1788: goto out;
1.62 markus 1789: }
1.69 djm 1790: if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0)
1791: goto out;
1.62 markus 1792: if (k->xmss_pk != NULL) {
1793: size_t pklen = sshkey_xmss_pklen(k);
1794: if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) {
1.69 djm 1795: r = SSH_ERR_INTERNAL_ERROR;
1796: goto out;
1.62 markus 1797: }
1798: if ((n->xmss_pk = malloc(pklen)) == NULL) {
1.69 djm 1799: r = SSH_ERR_ALLOC_FAIL;
1800: goto out;
1.62 markus 1801: }
1802: memcpy(n->xmss_pk, k->xmss_pk, pklen);
1803: }
1804: break;
1805: #endif /* WITH_XMSS */
1.1 djm 1806: default:
1.69 djm 1807: r = SSH_ERR_KEY_TYPE_UNKNOWN;
1808: goto out;
1.1 djm 1809: }
1.69 djm 1810: if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1811: goto out;
1812: /* success */
1.1 djm 1813: *pkp = n;
1.69 djm 1814: n = NULL;
1815: r = 0;
1816: out:
1817: sshkey_free(n);
1818: BN_clear_free(rsa_n_dup);
1819: BN_clear_free(rsa_e_dup);
1820: BN_clear_free(dsa_p_dup);
1821: BN_clear_free(dsa_q_dup);
1822: BN_clear_free(dsa_g_dup);
1823: BN_clear_free(dsa_pub_key_dup);
1824:
1825: return r;
1.1 djm 1826: }
1827:
1828: static int
1.14 djm 1829: cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1.1 djm 1830: {
1.14 djm 1831: struct sshbuf *principals = NULL, *crit = NULL;
1832: struct sshbuf *exts = NULL, *ca = NULL;
1833: u_char *sig = NULL;
1834: size_t signed_len = 0, slen = 0, kidlen = 0;
1.1 djm 1835: int ret = SSH_ERR_INTERNAL_ERROR;
1836:
1837: /* Copy the entire key blob for verification and later serialisation */
1.14 djm 1838: if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1.1 djm 1839: return ret;
1840:
1.20 djm 1841: /* Parse body of certificate up to signature */
1842: if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1.1 djm 1843: (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1844: (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1.4 djm 1845: (ret = sshbuf_froms(b, &principals)) != 0 ||
1.1 djm 1846: (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1847: (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1.4 djm 1848: (ret = sshbuf_froms(b, &crit)) != 0 ||
1.20 djm 1849: (ret = sshbuf_froms(b, &exts)) != 0 ||
1.1 djm 1850: (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1.14 djm 1851: (ret = sshbuf_froms(b, &ca)) != 0) {
1.1 djm 1852: /* XXX debug print error for ret */
1853: ret = SSH_ERR_INVALID_FORMAT;
1854: goto out;
1855: }
1856:
1857: /* Signature is left in the buffer so we can calculate this length */
1858: signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1859:
1860: if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1861: ret = SSH_ERR_INVALID_FORMAT;
1862: goto out;
1863: }
1864:
1865: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1866: key->cert->type != SSH2_CERT_TYPE_HOST) {
1867: ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1868: goto out;
1869: }
1870:
1.4 djm 1871: /* Parse principals section */
1872: while (sshbuf_len(principals) > 0) {
1873: char *principal = NULL;
1874: char **oprincipals = NULL;
1875:
1.1 djm 1876: if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1877: ret = SSH_ERR_INVALID_FORMAT;
1878: goto out;
1879: }
1.4 djm 1880: if ((ret = sshbuf_get_cstring(principals, &principal,
1881: NULL)) != 0) {
1.1 djm 1882: ret = SSH_ERR_INVALID_FORMAT;
1883: goto out;
1884: }
1885: oprincipals = key->cert->principals;
1.51 deraadt 1886: key->cert->principals = recallocarray(key->cert->principals,
1887: key->cert->nprincipals, key->cert->nprincipals + 1,
1888: sizeof(*key->cert->principals));
1.1 djm 1889: if (key->cert->principals == NULL) {
1890: free(principal);
1891: key->cert->principals = oprincipals;
1892: ret = SSH_ERR_ALLOC_FAIL;
1893: goto out;
1894: }
1895: key->cert->principals[key->cert->nprincipals++] = principal;
1896: }
1897:
1.4 djm 1898: /*
1899: * Stash a copies of the critical options and extensions sections
1900: * for later use.
1901: */
1902: if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1903: (exts != NULL &&
1904: (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1.1 djm 1905: goto out;
1906:
1.4 djm 1907: /*
1908: * Validate critical options and extensions sections format.
1909: */
1910: while (sshbuf_len(crit) != 0) {
1911: if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1912: (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1913: sshbuf_reset(key->cert->critical);
1.1 djm 1914: ret = SSH_ERR_INVALID_FORMAT;
1915: goto out;
1916: }
1917: }
1.4 djm 1918: while (exts != NULL && sshbuf_len(exts) != 0) {
1919: if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1920: (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1921: sshbuf_reset(key->cert->extensions);
1.1 djm 1922: ret = SSH_ERR_INVALID_FORMAT;
1923: goto out;
1924: }
1925: }
1926:
1.4 djm 1927: /* Parse CA key and check signature */
1.14 djm 1928: if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1.1 djm 1929: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1930: goto out;
1931: }
1932: if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1933: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1934: goto out;
1935: }
1936: if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1.59 djm 1937: sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0)
1.1 djm 1938: goto out;
1.67 djm 1939: if ((ret = get_sigtype(sig, slen, &key->cert->signature_type)) != 0)
1940: goto out;
1.4 djm 1941:
1942: /* Success */
1.1 djm 1943: ret = 0;
1944: out:
1.14 djm 1945: sshbuf_free(ca);
1.4 djm 1946: sshbuf_free(crit);
1947: sshbuf_free(exts);
1948: sshbuf_free(principals);
1.1 djm 1949: free(sig);
1950: return ret;
1951: }
1952:
1953: static int
1.69 djm 1954: check_rsa_length(const RSA *rsa)
1955: {
1956: const BIGNUM *rsa_n;
1957:
1958: RSA_get0_key(rsa, &rsa_n, NULL, NULL);
1959: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
1960: return SSH_ERR_KEY_LENGTH;
1961: return 0;
1962: }
1963:
1964: static int
1.14 djm 1965: sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1966: int allow_cert)
1.1 djm 1967: {
1.12 djm 1968: int type, ret = SSH_ERR_INTERNAL_ERROR;
1.62 markus 1969: char *ktype = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 1970: struct sshkey *key = NULL;
1971: size_t len;
1972: u_char *pk = NULL;
1.14 djm 1973: struct sshbuf *copy;
1.1 djm 1974: #ifdef WITH_OPENSSL
1975: EC_POINT *q = NULL;
1.69 djm 1976: BIGNUM *rsa_n = NULL, *rsa_e = NULL;
1977: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL;
1.1 djm 1978: #endif /* WITH_OPENSSL */
1979:
1980: #ifdef DEBUG_PK /* XXX */
1.14 djm 1981: sshbuf_dump(b, stderr);
1.1 djm 1982: #endif
1.32 djm 1983: if (keyp != NULL)
1984: *keyp = NULL;
1.14 djm 1985: if ((copy = sshbuf_fromb(b)) == NULL) {
1986: ret = SSH_ERR_ALLOC_FAIL;
1987: goto out;
1988: }
1.1 djm 1989: if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1990: ret = SSH_ERR_INVALID_FORMAT;
1991: goto out;
1992: }
1993:
1994: type = sshkey_type_from_name(ktype);
1995: if (!allow_cert && sshkey_type_is_cert(type)) {
1996: ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1997: goto out;
1998: }
1999: switch (type) {
2000: #ifdef WITH_OPENSSL
2001: case KEY_RSA_CERT:
1.14 djm 2002: /* Skip nonce */
1.1 djm 2003: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2004: ret = SSH_ERR_INVALID_FORMAT;
2005: goto out;
2006: }
2007: /* FALLTHROUGH */
2008: case KEY_RSA:
2009: if ((key = sshkey_new(type)) == NULL) {
2010: ret = SSH_ERR_ALLOC_FAIL;
2011: goto out;
2012: }
1.69 djm 2013: if ((rsa_e = BN_new()) == NULL ||
2014: (rsa_n = BN_new()) == NULL) {
2015: ret = SSH_ERR_ALLOC_FAIL;
2016: goto out;
2017: }
2018: if (sshbuf_get_bignum2(b, rsa_e) != 0 ||
2019: sshbuf_get_bignum2(b, rsa_n) != 0) {
1.1 djm 2020: ret = SSH_ERR_INVALID_FORMAT;
2021: goto out;
2022: }
1.69 djm 2023: if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) {
2024: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 2025: goto out;
2026: }
1.69 djm 2027: rsa_n = rsa_e = NULL; /* transferred */
2028: if ((ret = check_rsa_length(key->rsa)) != 0)
2029: goto out;
1.1 djm 2030: #ifdef DEBUG_PK
2031: RSA_print_fp(stderr, key->rsa, 8);
2032: #endif
2033: break;
2034: case KEY_DSA_CERT:
1.14 djm 2035: /* Skip nonce */
1.1 djm 2036: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2037: ret = SSH_ERR_INVALID_FORMAT;
2038: goto out;
2039: }
2040: /* FALLTHROUGH */
2041: case KEY_DSA:
2042: if ((key = sshkey_new(type)) == NULL) {
2043: ret = SSH_ERR_ALLOC_FAIL;
2044: goto out;
2045: }
1.69 djm 2046: if ((dsa_p = BN_new()) == NULL ||
2047: (dsa_q = BN_new()) == NULL ||
2048: (dsa_g = BN_new()) == NULL ||
2049: (dsa_pub_key = BN_new()) == NULL) {
2050: ret = SSH_ERR_ALLOC_FAIL;
2051: goto out;
2052: }
2053: if (sshbuf_get_bignum2(b, dsa_p) != 0 ||
2054: sshbuf_get_bignum2(b, dsa_q) != 0 ||
2055: sshbuf_get_bignum2(b, dsa_g) != 0 ||
2056: sshbuf_get_bignum2(b, dsa_pub_key) != 0) {
1.1 djm 2057: ret = SSH_ERR_INVALID_FORMAT;
2058: goto out;
2059: }
1.69 djm 2060: if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) {
2061: ret = SSH_ERR_LIBCRYPTO_ERROR;
2062: goto out;
2063: }
2064: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2065: if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) {
2066: ret = SSH_ERR_LIBCRYPTO_ERROR;
2067: goto out;
2068: }
2069: dsa_pub_key = NULL; /* transferred */
1.1 djm 2070: #ifdef DEBUG_PK
2071: DSA_print_fp(stderr, key->dsa, 8);
2072: #endif
2073: break;
2074: case KEY_ECDSA_CERT:
1.14 djm 2075: /* Skip nonce */
1.1 djm 2076: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2077: ret = SSH_ERR_INVALID_FORMAT;
2078: goto out;
2079: }
2080: /* FALLTHROUGH */
2081: case KEY_ECDSA:
2082: if ((key = sshkey_new(type)) == NULL) {
2083: ret = SSH_ERR_ALLOC_FAIL;
2084: goto out;
2085: }
1.12 djm 2086: key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
1.1 djm 2087: if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2088: ret = SSH_ERR_INVALID_FORMAT;
2089: goto out;
2090: }
2091: if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2092: ret = SSH_ERR_EC_CURVE_MISMATCH;
2093: goto out;
2094: }
1.60 jsing 2095: EC_KEY_free(key->ecdsa);
1.1 djm 2096: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2097: == NULL) {
2098: ret = SSH_ERR_EC_CURVE_INVALID;
2099: goto out;
2100: }
2101: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2102: ret = SSH_ERR_ALLOC_FAIL;
2103: goto out;
2104: }
2105: if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2106: ret = SSH_ERR_INVALID_FORMAT;
2107: goto out;
2108: }
2109: if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2110: q) != 0) {
2111: ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2112: goto out;
2113: }
2114: if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2115: /* XXX assume it is a allocation error */
2116: ret = SSH_ERR_ALLOC_FAIL;
2117: goto out;
2118: }
2119: #ifdef DEBUG_PK
2120: sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2121: #endif
2122: break;
2123: #endif /* WITH_OPENSSL */
2124: case KEY_ED25519_CERT:
1.14 djm 2125: /* Skip nonce */
1.1 djm 2126: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2127: ret = SSH_ERR_INVALID_FORMAT;
2128: goto out;
2129: }
2130: /* FALLTHROUGH */
2131: case KEY_ED25519:
2132: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2133: goto out;
2134: if (len != ED25519_PK_SZ) {
2135: ret = SSH_ERR_INVALID_FORMAT;
2136: goto out;
2137: }
2138: if ((key = sshkey_new(type)) == NULL) {
2139: ret = SSH_ERR_ALLOC_FAIL;
2140: goto out;
2141: }
2142: key->ed25519_pk = pk;
2143: pk = NULL;
2144: break;
1.62 markus 2145: #ifdef WITH_XMSS
2146: case KEY_XMSS_CERT:
2147: /* Skip nonce */
2148: if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2149: ret = SSH_ERR_INVALID_FORMAT;
2150: goto out;
2151: }
2152: /* FALLTHROUGH */
2153: case KEY_XMSS:
2154: if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0)
2155: goto out;
2156: if ((key = sshkey_new(type)) == NULL) {
2157: ret = SSH_ERR_ALLOC_FAIL;
2158: goto out;
2159: }
2160: if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
2161: goto out;
2162: if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2163: goto out;
2164: if (len == 0 || len != sshkey_xmss_pklen(key)) {
2165: ret = SSH_ERR_INVALID_FORMAT;
2166: goto out;
2167: }
2168: key->xmss_pk = pk;
2169: pk = NULL;
2170: if (type != KEY_XMSS_CERT &&
2171: (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0)
2172: goto out;
2173: break;
2174: #endif /* WITH_XMSS */
1.1 djm 2175: case KEY_UNSPEC:
2176: default:
2177: ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2178: goto out;
2179: }
2180:
2181: /* Parse certificate potion */
1.14 djm 2182: if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1.1 djm 2183: goto out;
2184:
2185: if (key != NULL && sshbuf_len(b) != 0) {
2186: ret = SSH_ERR_INVALID_FORMAT;
2187: goto out;
2188: }
2189: ret = 0;
1.32 djm 2190: if (keyp != NULL) {
2191: *keyp = key;
2192: key = NULL;
2193: }
1.1 djm 2194: out:
1.14 djm 2195: sshbuf_free(copy);
1.1 djm 2196: sshkey_free(key);
1.62 markus 2197: free(xmss_name);
1.1 djm 2198: free(ktype);
2199: free(curve);
2200: free(pk);
2201: #ifdef WITH_OPENSSL
1.60 jsing 2202: EC_POINT_free(q);
1.69 djm 2203: BN_clear_free(rsa_n);
2204: BN_clear_free(rsa_e);
2205: BN_clear_free(dsa_p);
2206: BN_clear_free(dsa_q);
2207: BN_clear_free(dsa_g);
2208: BN_clear_free(dsa_pub_key);
1.1 djm 2209: #endif /* WITH_OPENSSL */
2210: return ret;
2211: }
2212:
2213: int
2214: sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2215: {
1.14 djm 2216: struct sshbuf *b;
2217: int r;
2218:
2219: if ((b = sshbuf_from(blob, blen)) == NULL)
2220: return SSH_ERR_ALLOC_FAIL;
2221: r = sshkey_from_blob_internal(b, keyp, 1);
2222: sshbuf_free(b);
2223: return r;
2224: }
2225:
2226: int
2227: sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2228: {
2229: return sshkey_from_blob_internal(b, keyp, 1);
2230: }
2231:
2232: int
2233: sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2234: {
2235: struct sshbuf *b;
2236: int r;
2237:
2238: if ((r = sshbuf_froms(buf, &b)) != 0)
2239: return r;
2240: r = sshkey_from_blob_internal(b, keyp, 1);
1.58 djm 2241: sshbuf_free(b);
2242: return r;
2243: }
2244:
1.65 djm 2245: static int
2246: get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
1.58 djm 2247: {
2248: int r;
2249: struct sshbuf *b = NULL;
2250: char *sigtype = NULL;
2251:
2252: if (sigtypep != NULL)
2253: *sigtypep = NULL;
2254: if ((b = sshbuf_from(sig, siglen)) == NULL)
2255: return SSH_ERR_ALLOC_FAIL;
2256: if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
2257: goto out;
2258: /* success */
2259: if (sigtypep != NULL) {
2260: *sigtypep = sigtype;
2261: sigtype = NULL;
2262: }
2263: r = 0;
2264: out:
2265: free(sigtype);
1.14 djm 2266: sshbuf_free(b);
2267: return r;
1.68 djm 2268: }
2269:
2270: /*
2271: *
2272: * Checks whether a certificate's signature type is allowed.
2273: * Returns 0 (success) if the certificate signature type appears in the
2274: * "allowed" pattern-list, or the key is not a certificate to begin with.
2275: * Otherwise returns a ssherr.h code.
2276: */
2277: int
2278: sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
2279: {
2280: if (key == NULL || allowed == NULL)
2281: return SSH_ERR_INVALID_ARGUMENT;
2282: if (!sshkey_type_is_cert(key->type))
2283: return 0;
2284: if (key->cert == NULL || key->cert->signature_type == NULL)
2285: return SSH_ERR_INVALID_ARGUMENT;
2286: if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2287: return SSH_ERR_SIGN_ALG_UNSUPPORTED;
2288: return 0;
1.65 djm 2289: }
2290:
2291: /*
2292: * Returns the expected signature algorithm for a given public key algorithm.
2293: */
1.66 djm 2294: const char *
2295: sshkey_sigalg_by_name(const char *name)
1.65 djm 2296: {
2297: const struct keytype *kt;
2298:
2299: for (kt = keytypes; kt->type != -1; kt++) {
2300: if (strcmp(kt->name, name) != 0)
2301: continue;
2302: if (kt->sigalg != NULL)
2303: return kt->sigalg;
2304: if (!kt->cert)
2305: return kt->name;
2306: return sshkey_ssh_name_from_type_nid(
2307: sshkey_type_plain(kt->type), kt->nid);
2308: }
2309: return NULL;
2310: }
2311:
2312: /*
2313: * Verifies that the signature algorithm appearing inside the signature blob
2314: * matches that which was requested.
2315: */
2316: int
2317: sshkey_check_sigtype(const u_char *sig, size_t siglen,
2318: const char *requested_alg)
2319: {
2320: const char *expected_alg;
2321: char *sigtype = NULL;
2322: int r;
2323:
2324: if (requested_alg == NULL)
2325: return 0;
1.66 djm 2326: if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
1.65 djm 2327: return SSH_ERR_INVALID_ARGUMENT;
2328: if ((r = get_sigtype(sig, siglen, &sigtype)) != 0)
2329: return r;
2330: r = strcmp(expected_alg, sigtype) == 0;
2331: free(sigtype);
2332: return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
1.1 djm 2333: }
2334:
2335: int
2336: sshkey_sign(const struct sshkey *key,
2337: u_char **sigp, size_t *lenp,
1.28 markus 2338: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.1 djm 2339: {
2340: if (sigp != NULL)
2341: *sigp = NULL;
2342: if (lenp != NULL)
2343: *lenp = 0;
2344: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2345: return SSH_ERR_INVALID_ARGUMENT;
2346: switch (key->type) {
2347: #ifdef WITH_OPENSSL
2348: case KEY_DSA_CERT:
2349: case KEY_DSA:
2350: return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2351: case KEY_ECDSA_CERT:
2352: case KEY_ECDSA:
2353: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2354: case KEY_RSA_CERT:
2355: case KEY_RSA:
1.28 markus 2356: return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
1.1 djm 2357: #endif /* WITH_OPENSSL */
2358: case KEY_ED25519:
2359: case KEY_ED25519_CERT:
2360: return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
1.62 markus 2361: #ifdef WITH_XMSS
2362: case KEY_XMSS:
2363: case KEY_XMSS_CERT:
2364: return ssh_xmss_sign(key, sigp, lenp, data, datalen, compat);
2365: #endif /* WITH_XMSS */
1.1 djm 2366: default:
2367: return SSH_ERR_KEY_TYPE_UNKNOWN;
2368: }
2369: }
2370:
2371: /*
2372: * ssh_key_verify returns 0 for a correct signature and < 0 on error.
1.59 djm 2373: * If "alg" specified, then the signature must use that algorithm.
1.1 djm 2374: */
2375: int
2376: sshkey_verify(const struct sshkey *key,
2377: const u_char *sig, size_t siglen,
1.59 djm 2378: const u_char *data, size_t dlen, const char *alg, u_int compat)
1.1 djm 2379: {
1.6 djm 2380: if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
1.1 djm 2381: return SSH_ERR_INVALID_ARGUMENT;
2382: switch (key->type) {
2383: #ifdef WITH_OPENSSL
2384: case KEY_DSA_CERT:
2385: case KEY_DSA:
2386: return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2387: case KEY_ECDSA_CERT:
2388: case KEY_ECDSA:
2389: return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2390: case KEY_RSA_CERT:
2391: case KEY_RSA:
1.59 djm 2392: return ssh_rsa_verify(key, sig, siglen, data, dlen, alg);
1.1 djm 2393: #endif /* WITH_OPENSSL */
2394: case KEY_ED25519:
2395: case KEY_ED25519_CERT:
2396: return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
1.62 markus 2397: #ifdef WITH_XMSS
2398: case KEY_XMSS:
2399: case KEY_XMSS_CERT:
2400: return ssh_xmss_verify(key, sig, siglen, data, dlen, compat);
2401: #endif /* WITH_XMSS */
1.1 djm 2402: default:
2403: return SSH_ERR_KEY_TYPE_UNKNOWN;
2404: }
2405: }
2406:
2407: /* Convert a plain key to their _CERT equivalent */
2408: int
1.20 djm 2409: sshkey_to_certified(struct sshkey *k)
1.1 djm 2410: {
2411: int newtype;
2412:
2413: switch (k->type) {
2414: #ifdef WITH_OPENSSL
2415: case KEY_RSA:
1.20 djm 2416: newtype = KEY_RSA_CERT;
1.1 djm 2417: break;
2418: case KEY_DSA:
1.20 djm 2419: newtype = KEY_DSA_CERT;
1.1 djm 2420: break;
2421: case KEY_ECDSA:
2422: newtype = KEY_ECDSA_CERT;
2423: break;
2424: #endif /* WITH_OPENSSL */
2425: case KEY_ED25519:
2426: newtype = KEY_ED25519_CERT;
2427: break;
1.62 markus 2428: #ifdef WITH_XMSS
2429: case KEY_XMSS:
2430: newtype = KEY_XMSS_CERT;
2431: break;
2432: #endif /* WITH_XMSS */
1.1 djm 2433: default:
2434: return SSH_ERR_INVALID_ARGUMENT;
2435: }
2436: if ((k->cert = cert_new()) == NULL)
2437: return SSH_ERR_ALLOC_FAIL;
2438: k->type = newtype;
2439: return 0;
2440: }
2441:
2442: /* Convert a certificate to its raw key equivalent */
2443: int
2444: sshkey_drop_cert(struct sshkey *k)
2445: {
2446: if (!sshkey_type_is_cert(k->type))
2447: return SSH_ERR_KEY_TYPE_UNKNOWN;
2448: cert_free(k->cert);
2449: k->cert = NULL;
2450: k->type = sshkey_type_plain(k->type);
2451: return 0;
2452: }
2453:
2454: /* Sign a certified key, (re-)generating the signed certblob. */
2455: int
1.53 djm 2456: sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
2457: sshkey_certify_signer *signer, void *signer_ctx)
1.1 djm 2458: {
2459: struct sshbuf *principals = NULL;
2460: u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2461: size_t i, ca_len, sig_len;
2462: int ret = SSH_ERR_INTERNAL_ERROR;
1.67 djm 2463: struct sshbuf *cert = NULL;
2464: char *sigtype = NULL;
1.69 djm 2465: #ifdef WITH_OPENSSL
2466: const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key;
2467: #endif /* WITH_OPENSSL */
1.1 djm 2468:
2469: if (k == NULL || k->cert == NULL ||
2470: k->cert->certblob == NULL || ca == NULL)
2471: return SSH_ERR_INVALID_ARGUMENT;
2472: if (!sshkey_is_cert(k))
2473: return SSH_ERR_KEY_TYPE_UNKNOWN;
2474: if (!sshkey_type_is_valid_ca(ca->type))
2475: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2476:
1.67 djm 2477: /*
2478: * If no alg specified as argument but a signature_type was set,
2479: * then prefer that. If both were specified, then they must match.
2480: */
2481: if (alg == NULL)
2482: alg = k->cert->signature_type;
2483: else if (k->cert->signature_type != NULL &&
2484: strcmp(alg, k->cert->signature_type) != 0)
2485: return SSH_ERR_INVALID_ARGUMENT;
2486:
1.1 djm 2487: if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2488: return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2489:
2490: cert = k->cert->certblob; /* for readability */
2491: sshbuf_reset(cert);
2492: if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2493: goto out;
2494:
2495: /* -v01 certs put nonce first */
2496: arc4random_buf(&nonce, sizeof(nonce));
1.20 djm 2497: if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2498: goto out;
1.1 djm 2499:
2500: /* XXX this substantially duplicates to_blob(); refactor */
2501: switch (k->type) {
2502: #ifdef WITH_OPENSSL
2503: case KEY_DSA_CERT:
1.69 djm 2504: DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g);
2505: DSA_get0_key(k->dsa, &dsa_pub_key, NULL);
2506: if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 ||
2507: (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 ||
2508: (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 ||
2509: (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0)
1.1 djm 2510: goto out;
2511: break;
2512: case KEY_ECDSA_CERT:
2513: if ((ret = sshbuf_put_cstring(cert,
2514: sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2515: (ret = sshbuf_put_ec(cert,
2516: EC_KEY_get0_public_key(k->ecdsa),
2517: EC_KEY_get0_group(k->ecdsa))) != 0)
2518: goto out;
2519: break;
2520: case KEY_RSA_CERT:
1.69 djm 2521: RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL);
2522: if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 ||
2523: (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0)
1.1 djm 2524: goto out;
2525: break;
2526: #endif /* WITH_OPENSSL */
2527: case KEY_ED25519_CERT:
2528: if ((ret = sshbuf_put_string(cert,
2529: k->ed25519_pk, ED25519_PK_SZ)) != 0)
2530: goto out;
2531: break;
1.62 markus 2532: #ifdef WITH_XMSS
2533: case KEY_XMSS_CERT:
2534: if (k->xmss_name == NULL) {
2535: ret = SSH_ERR_INVALID_ARGUMENT;
2536: goto out;
2537: }
2538: if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) ||
2539: (ret = sshbuf_put_string(cert,
2540: k->xmss_pk, sshkey_xmss_pklen(k))) != 0)
2541: goto out;
2542: break;
2543: #endif /* WITH_XMSS */
1.1 djm 2544: default:
2545: ret = SSH_ERR_INVALID_ARGUMENT;
1.15 djm 2546: goto out;
1.1 djm 2547: }
2548:
1.20 djm 2549: if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2550: (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
1.1 djm 2551: (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2552: goto out;
2553:
2554: if ((principals = sshbuf_new()) == NULL) {
2555: ret = SSH_ERR_ALLOC_FAIL;
2556: goto out;
2557: }
2558: for (i = 0; i < k->cert->nprincipals; i++) {
2559: if ((ret = sshbuf_put_cstring(principals,
2560: k->cert->principals[i])) != 0)
2561: goto out;
2562: }
2563: if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2564: (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2565: (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
1.20 djm 2566: (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2567: (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2568: (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
1.1 djm 2569: (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2570: goto out;
2571:
2572: /* Sign the whole mess */
1.53 djm 2573: if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2574: sshbuf_len(cert), alg, 0, signer_ctx)) != 0)
1.1 djm 2575: goto out;
1.67 djm 2576: /* Check and update signature_type against what was actually used */
2577: if ((ret = get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
2578: goto out;
2579: if (alg != NULL && strcmp(alg, sigtype) != 0) {
2580: ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
2581: goto out;
2582: }
2583: if (k->cert->signature_type == NULL) {
2584: k->cert->signature_type = sigtype;
2585: sigtype = NULL;
2586: }
1.1 djm 2587: /* Append signature and we are done */
2588: if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2589: goto out;
2590: ret = 0;
2591: out:
2592: if (ret != 0)
2593: sshbuf_reset(cert);
1.29 mmcc 2594: free(sig_blob);
2595: free(ca_blob);
1.67 djm 2596: free(sigtype);
1.31 mmcc 2597: sshbuf_free(principals);
1.1 djm 2598: return ret;
1.53 djm 2599: }
2600:
2601: static int
2602: default_key_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
2603: const u_char *data, size_t datalen,
2604: const char *alg, u_int compat, void *ctx)
2605: {
2606: if (ctx != NULL)
2607: return SSH_ERR_INVALID_ARGUMENT;
2608: return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat);
2609: }
2610:
2611: int
2612: sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg)
2613: {
2614: return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL);
1.1 djm 2615: }
2616:
2617: int
2618: sshkey_cert_check_authority(const struct sshkey *k,
2619: int want_host, int require_principal,
2620: const char *name, const char **reason)
2621: {
2622: u_int i, principal_matches;
2623: time_t now = time(NULL);
2624:
2625: if (reason != NULL)
2626: *reason = NULL;
2627:
2628: if (want_host) {
2629: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2630: *reason = "Certificate invalid: not a host certificate";
2631: return SSH_ERR_KEY_CERT_INVALID;
2632: }
2633: } else {
2634: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2635: *reason = "Certificate invalid: not a user certificate";
2636: return SSH_ERR_KEY_CERT_INVALID;
2637: }
2638: }
2639: if (now < 0) {
2640: /* yikes - system clock before epoch! */
2641: *reason = "Certificate invalid: not yet valid";
2642: return SSH_ERR_KEY_CERT_INVALID;
2643: }
2644: if ((u_int64_t)now < k->cert->valid_after) {
2645: *reason = "Certificate invalid: not yet valid";
2646: return SSH_ERR_KEY_CERT_INVALID;
2647: }
2648: if ((u_int64_t)now >= k->cert->valid_before) {
2649: *reason = "Certificate invalid: expired";
2650: return SSH_ERR_KEY_CERT_INVALID;
2651: }
2652: if (k->cert->nprincipals == 0) {
2653: if (require_principal) {
2654: *reason = "Certificate lacks principal list";
2655: return SSH_ERR_KEY_CERT_INVALID;
2656: }
2657: } else if (name != NULL) {
2658: principal_matches = 0;
2659: for (i = 0; i < k->cert->nprincipals; i++) {
2660: if (strcmp(name, k->cert->principals[i]) == 0) {
2661: principal_matches = 1;
2662: break;
2663: }
2664: }
2665: if (!principal_matches) {
2666: *reason = "Certificate invalid: name is not a listed "
2667: "principal";
2668: return SSH_ERR_KEY_CERT_INVALID;
2669: }
2670: }
2671: return 0;
1.27 djm 2672: }
2673:
2674: size_t
2675: sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
2676: {
2677: char from[32], to[32], ret[64];
2678: time_t tt;
2679: struct tm *tm;
2680:
2681: *from = *to = '\0';
2682: if (cert->valid_after == 0 &&
2683: cert->valid_before == 0xffffffffffffffffULL)
2684: return strlcpy(s, "forever", l);
2685:
2686: if (cert->valid_after != 0) {
2687: /* XXX revisit INT_MAX in 2038 :) */
2688: tt = cert->valid_after > INT_MAX ?
2689: INT_MAX : cert->valid_after;
2690: tm = localtime(&tt);
2691: strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
2692: }
2693: if (cert->valid_before != 0xffffffffffffffffULL) {
2694: /* XXX revisit INT_MAX in 2038 :) */
2695: tt = cert->valid_before > INT_MAX ?
2696: INT_MAX : cert->valid_before;
2697: tm = localtime(&tt);
2698: strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
2699: }
2700:
2701: if (cert->valid_after == 0)
2702: snprintf(ret, sizeof(ret), "before %s", to);
2703: else if (cert->valid_before == 0xffffffffffffffffULL)
2704: snprintf(ret, sizeof(ret), "after %s", from);
2705: else
2706: snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2707:
2708: return strlcpy(s, ret, l);
1.1 djm 2709: }
2710:
2711: int
1.62 markus 2712: sshkey_private_serialize_opt(const struct sshkey *key, struct sshbuf *b,
2713: enum sshkey_serialize_rep opts)
1.1 djm 2714: {
2715: int r = SSH_ERR_INTERNAL_ERROR;
1.69 djm 2716: #ifdef WITH_OPENSSL
2717: const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
2718: const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key;
2719: #endif /* WITH_OPENSSL */
1.1 djm 2720:
2721: if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2722: goto out;
2723: switch (key->type) {
2724: #ifdef WITH_OPENSSL
2725: case KEY_RSA:
1.69 djm 2726: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d);
2727: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2728: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
2729: if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
2730: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
2731: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2732: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2733: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2734: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2735: goto out;
2736: break;
2737: case KEY_RSA_CERT:
2738: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2739: r = SSH_ERR_INVALID_ARGUMENT;
2740: goto out;
2741: }
1.69 djm 2742: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
2743: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
2744: RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp);
1.1 djm 2745: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2746: (r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
2747: (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
2748: (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
2749: (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
1.1 djm 2750: goto out;
2751: break;
2752: case KEY_DSA:
1.69 djm 2753: DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g);
2754: DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key);
2755: if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 ||
2756: (r = sshbuf_put_bignum2(b, dsa_q)) != 0 ||
2757: (r = sshbuf_put_bignum2(b, dsa_g)) != 0 ||
2758: (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 ||
2759: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2760: goto out;
2761: break;
2762: case KEY_DSA_CERT:
2763: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2764: r = SSH_ERR_INVALID_ARGUMENT;
2765: goto out;
2766: }
1.69 djm 2767: DSA_get0_key(key->dsa, NULL, &dsa_priv_key);
1.1 djm 2768: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
1.69 djm 2769: (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0)
1.1 djm 2770: goto out;
2771: break;
2772: case KEY_ECDSA:
2773: if ((r = sshbuf_put_cstring(b,
2774: sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2775: (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2776: (r = sshbuf_put_bignum2(b,
2777: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2778: goto out;
2779: break;
2780: case KEY_ECDSA_CERT:
2781: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2782: r = SSH_ERR_INVALID_ARGUMENT;
2783: goto out;
2784: }
2785: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2786: (r = sshbuf_put_bignum2(b,
2787: EC_KEY_get0_private_key(key->ecdsa))) != 0)
2788: goto out;
2789: break;
2790: #endif /* WITH_OPENSSL */
2791: case KEY_ED25519:
2792: if ((r = sshbuf_put_string(b, key->ed25519_pk,
2793: ED25519_PK_SZ)) != 0 ||
2794: (r = sshbuf_put_string(b, key->ed25519_sk,
2795: ED25519_SK_SZ)) != 0)
2796: goto out;
2797: break;
2798: case KEY_ED25519_CERT:
2799: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2800: r = SSH_ERR_INVALID_ARGUMENT;
2801: goto out;
2802: }
2803: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2804: (r = sshbuf_put_string(b, key->ed25519_pk,
2805: ED25519_PK_SZ)) != 0 ||
2806: (r = sshbuf_put_string(b, key->ed25519_sk,
2807: ED25519_SK_SZ)) != 0)
2808: goto out;
2809: break;
1.62 markus 2810: #ifdef WITH_XMSS
2811: case KEY_XMSS:
2812: if (key->xmss_name == NULL) {
2813: r = SSH_ERR_INVALID_ARGUMENT;
2814: goto out;
2815: }
2816: if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2817: (r = sshbuf_put_string(b, key->xmss_pk,
2818: sshkey_xmss_pklen(key))) != 0 ||
2819: (r = sshbuf_put_string(b, key->xmss_sk,
2820: sshkey_xmss_sklen(key))) != 0 ||
2821: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2822: goto out;
2823: break;
2824: case KEY_XMSS_CERT:
2825: if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 ||
2826: key->xmss_name == NULL) {
2827: r = SSH_ERR_INVALID_ARGUMENT;
2828: goto out;
2829: }
2830: if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2831: (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 ||
2832: (r = sshbuf_put_string(b, key->xmss_pk,
2833: sshkey_xmss_pklen(key))) != 0 ||
2834: (r = sshbuf_put_string(b, key->xmss_sk,
2835: sshkey_xmss_sklen(key))) != 0 ||
2836: (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0)
2837: goto out;
2838: break;
2839: #endif /* WITH_XMSS */
1.1 djm 2840: default:
2841: r = SSH_ERR_INVALID_ARGUMENT;
2842: goto out;
2843: }
2844: /* success */
2845: r = 0;
2846: out:
2847: return r;
2848: }
2849:
2850: int
1.62 markus 2851: sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2852: {
2853: return sshkey_private_serialize_opt(key, b,
2854: SSHKEY_SERIALIZE_DEFAULT);
2855: }
2856:
2857: int
1.1 djm 2858: sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2859: {
1.62 markus 2860: char *tname = NULL, *curve = NULL, *xmss_name = NULL;
1.1 djm 2861: struct sshkey *k = NULL;
1.14 djm 2862: size_t pklen = 0, sklen = 0;
1.1 djm 2863: int type, r = SSH_ERR_INTERNAL_ERROR;
2864: u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
1.62 markus 2865: u_char *xmss_pk = NULL, *xmss_sk = NULL;
1.1 djm 2866: #ifdef WITH_OPENSSL
2867: BIGNUM *exponent = NULL;
1.69 djm 2868: BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
2869: BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
2870: BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
2871: BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
1.1 djm 2872: #endif /* WITH_OPENSSL */
2873:
2874: if (kp != NULL)
2875: *kp = NULL;
2876: if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2877: goto out;
2878: type = sshkey_type_from_name(tname);
2879: switch (type) {
2880: #ifdef WITH_OPENSSL
2881: case KEY_DSA:
1.70 djm 2882: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2883: r = SSH_ERR_ALLOC_FAIL;
2884: goto out;
2885: }
1.69 djm 2886: if ((dsa_p = BN_new()) == NULL ||
2887: (dsa_q = BN_new()) == NULL ||
2888: (dsa_g = BN_new()) == NULL ||
2889: (dsa_pub_key = BN_new()) == NULL ||
2890: (dsa_priv_key = BN_new()) == NULL) {
2891: r = SSH_ERR_ALLOC_FAIL;
2892: goto out;
2893: }
2894: if ((r = sshbuf_get_bignum2(buf, dsa_p)) != 0 ||
2895: (r = sshbuf_get_bignum2(buf, dsa_q)) != 0 ||
2896: (r = sshbuf_get_bignum2(buf, dsa_g)) != 0 ||
2897: (r = sshbuf_get_bignum2(buf, dsa_pub_key)) != 0 ||
2898: (r = sshbuf_get_bignum2(buf, dsa_priv_key)) != 0)
2899: goto out;
2900: if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) {
2901: r = SSH_ERR_LIBCRYPTO_ERROR;
2902: goto out;
2903: }
2904: dsa_p = dsa_q = dsa_g = NULL; /* transferred */
2905: if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) {
2906: r = SSH_ERR_LIBCRYPTO_ERROR;
1.1 djm 2907: goto out;
1.69 djm 2908: }
2909: dsa_pub_key = dsa_priv_key = NULL; /* transferred */
1.1 djm 2910: break;
2911: case KEY_DSA_CERT:
1.69 djm 2912: if ((dsa_priv_key = BN_new()) == NULL) {
2913: r = SSH_ERR_ALLOC_FAIL;
2914: goto out;
2915: }
1.14 djm 2916: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.69 djm 2917: (r = sshbuf_get_bignum2(buf, dsa_priv_key)) != 0)
1.1 djm 2918: goto out;
1.69 djm 2919: if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) {
2920: r = SSH_ERR_LIBCRYPTO_ERROR;
2921: goto out;
2922: }
2923: dsa_priv_key = NULL; /* transferred */
1.1 djm 2924: break;
2925: case KEY_ECDSA:
1.70 djm 2926: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2927: r = SSH_ERR_ALLOC_FAIL;
2928: goto out;
2929: }
2930: if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2931: r = SSH_ERR_INVALID_ARGUMENT;
2932: goto out;
2933: }
2934: if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2935: goto out;
2936: if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2937: r = SSH_ERR_EC_CURVE_MISMATCH;
2938: goto out;
2939: }
2940: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2941: if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2942: r = SSH_ERR_LIBCRYPTO_ERROR;
2943: goto out;
2944: }
2945: if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2946: (r = sshbuf_get_bignum2(buf, exponent)))
2947: goto out;
2948: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2949: r = SSH_ERR_LIBCRYPTO_ERROR;
2950: goto out;
2951: }
2952: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2953: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2954: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2955: goto out;
2956: break;
2957: case KEY_ECDSA_CERT:
2958: if ((exponent = BN_new()) == NULL) {
2959: r = SSH_ERR_LIBCRYPTO_ERROR;
2960: goto out;
2961: }
1.14 djm 2962: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 2963: (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2964: goto out;
2965: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2966: r = SSH_ERR_LIBCRYPTO_ERROR;
2967: goto out;
2968: }
2969: if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
1.22 jsg 2970: EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
1.1 djm 2971: (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2972: goto out;
2973: break;
2974: case KEY_RSA:
1.70 djm 2975: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 2976: r = SSH_ERR_ALLOC_FAIL;
2977: goto out;
2978: }
1.69 djm 2979: if ((rsa_n = BN_new()) == NULL ||
2980: (rsa_e = BN_new()) == NULL ||
2981: (rsa_d = BN_new()) == NULL ||
2982: (rsa_iqmp = BN_new()) == NULL ||
2983: (rsa_p = BN_new()) == NULL ||
2984: (rsa_q = BN_new()) == NULL) {
2985: r = SSH_ERR_ALLOC_FAIL;
2986: goto out;
2987: }
2988: if ((r = sshbuf_get_bignum2(buf, rsa_n)) != 0 ||
2989: (r = sshbuf_get_bignum2(buf, rsa_e)) != 0 ||
2990: (r = sshbuf_get_bignum2(buf, rsa_d)) != 0 ||
2991: (r = sshbuf_get_bignum2(buf, rsa_iqmp)) != 0 ||
2992: (r = sshbuf_get_bignum2(buf, rsa_p)) != 0 ||
2993: (r = sshbuf_get_bignum2(buf, rsa_q)) != 0)
1.1 djm 2994: goto out;
1.69 djm 2995: if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) {
2996: r = SSH_ERR_LIBCRYPTO_ERROR;
2997: goto out;
2998: }
2999: rsa_n = rsa_e = rsa_d = NULL; /* transferred */
3000: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3001: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3002: goto out;
3003: }
1.69 djm 3004: rsa_p = rsa_q = NULL; /* transferred */
3005: if ((r = check_rsa_length(k->rsa)) != 0)
3006: goto out;
3007: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3008: goto out;
1.1 djm 3009: break;
3010: case KEY_RSA_CERT:
1.69 djm 3011: if ((rsa_d = BN_new()) == NULL ||
3012: (rsa_iqmp = BN_new()) == NULL ||
3013: (rsa_p = BN_new()) == NULL ||
3014: (rsa_q = BN_new()) == NULL) {
3015: r = SSH_ERR_ALLOC_FAIL;
3016: goto out;
3017: }
1.14 djm 3018: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.69 djm 3019: (r = sshbuf_get_bignum2(buf, rsa_d)) != 0 ||
3020: (r = sshbuf_get_bignum2(buf, rsa_iqmp)) != 0 ||
3021: (r = sshbuf_get_bignum2(buf, rsa_p)) != 0 ||
3022: (r = sshbuf_get_bignum2(buf, rsa_q)) != 0)
1.1 djm 3023: goto out;
1.69 djm 3024: if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) {
3025: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3026: goto out;
3027: }
1.69 djm 3028: rsa_d = NULL; /* transferred */
3029: if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) {
3030: r = SSH_ERR_LIBCRYPTO_ERROR;
3031: goto out;
3032: }
3033: rsa_p = rsa_q = NULL; /* transferred */
3034: if ((r = check_rsa_length(k->rsa)) != 0)
3035: goto out;
3036: if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0)
3037: goto out;
1.1 djm 3038: break;
3039: #endif /* WITH_OPENSSL */
3040: case KEY_ED25519:
1.70 djm 3041: if ((k = sshkey_new(type)) == NULL) {
1.1 djm 3042: r = SSH_ERR_ALLOC_FAIL;
3043: goto out;
3044: }
3045: if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3046: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3047: goto out;
3048: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3049: r = SSH_ERR_INVALID_FORMAT;
3050: goto out;
3051: }
3052: k->ed25519_pk = ed25519_pk;
3053: k->ed25519_sk = ed25519_sk;
3054: ed25519_pk = ed25519_sk = NULL;
3055: break;
3056: case KEY_ED25519_CERT:
1.14 djm 3057: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.1 djm 3058: (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
3059: (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
3060: goto out;
3061: if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
3062: r = SSH_ERR_INVALID_FORMAT;
3063: goto out;
3064: }
3065: k->ed25519_pk = ed25519_pk;
3066: k->ed25519_sk = ed25519_sk;
3067: ed25519_pk = ed25519_sk = NULL;
3068: break;
1.62 markus 3069: #ifdef WITH_XMSS
3070: case KEY_XMSS:
1.70 djm 3071: if ((k = sshkey_new(type)) == NULL) {
1.62 markus 3072: r = SSH_ERR_ALLOC_FAIL;
3073: goto out;
3074: }
3075: if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
3076: (r = sshkey_xmss_init(k, xmss_name)) != 0 ||
3077: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3078: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3079: goto out;
3080: if (pklen != sshkey_xmss_pklen(k) ||
3081: sklen != sshkey_xmss_sklen(k)) {
3082: r = SSH_ERR_INVALID_FORMAT;
3083: goto out;
3084: }
3085: k->xmss_pk = xmss_pk;
3086: k->xmss_sk = xmss_sk;
3087: xmss_pk = xmss_sk = NULL;
3088: /* optional internal state */
3089: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3090: goto out;
3091: break;
3092: case KEY_XMSS_CERT:
3093: if ((r = sshkey_froms(buf, &k)) != 0 ||
1.64 markus 3094: (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 ||
1.62 markus 3095: (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 ||
3096: (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0)
3097: goto out;
1.64 markus 3098: if (strcmp(xmss_name, k->xmss_name)) {
3099: r = SSH_ERR_INVALID_FORMAT;
3100: goto out;
3101: }
1.62 markus 3102: if (pklen != sshkey_xmss_pklen(k) ||
3103: sklen != sshkey_xmss_sklen(k)) {
3104: r = SSH_ERR_INVALID_FORMAT;
3105: goto out;
3106: }
3107: k->xmss_pk = xmss_pk;
3108: k->xmss_sk = xmss_sk;
3109: xmss_pk = xmss_sk = NULL;
3110: /* optional internal state */
3111: if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0)
3112: goto out;
3113: break;
3114: #endif /* WITH_XMSS */
1.1 djm 3115: default:
3116: r = SSH_ERR_KEY_TYPE_UNKNOWN;
3117: goto out;
3118: }
3119: #ifdef WITH_OPENSSL
3120: /* enable blinding */
3121: switch (k->type) {
3122: case KEY_RSA:
3123: case KEY_RSA_CERT:
3124: if (RSA_blinding_on(k->rsa, NULL) != 1) {
3125: r = SSH_ERR_LIBCRYPTO_ERROR;
3126: goto out;
3127: }
3128: break;
3129: }
3130: #endif /* WITH_OPENSSL */
3131: /* success */
3132: r = 0;
3133: if (kp != NULL) {
3134: *kp = k;
3135: k = NULL;
3136: }
3137: out:
3138: free(tname);
3139: free(curve);
3140: #ifdef WITH_OPENSSL
1.60 jsing 3141: BN_clear_free(exponent);
1.69 djm 3142: BN_clear_free(dsa_p);
3143: BN_clear_free(dsa_q);
3144: BN_clear_free(dsa_g);
3145: BN_clear_free(dsa_pub_key);
3146: BN_clear_free(dsa_priv_key);
3147: BN_clear_free(rsa_n);
3148: BN_clear_free(rsa_e);
3149: BN_clear_free(rsa_d);
3150: BN_clear_free(rsa_p);
3151: BN_clear_free(rsa_q);
3152: BN_clear_free(rsa_iqmp);
1.1 djm 3153: #endif /* WITH_OPENSSL */
3154: sshkey_free(k);
1.61 jsing 3155: freezero(ed25519_pk, pklen);
3156: freezero(ed25519_sk, sklen);
1.62 markus 3157: free(xmss_name);
3158: freezero(xmss_pk, pklen);
3159: freezero(xmss_sk, sklen);
1.1 djm 3160: return r;
3161: }
3162:
3163: #ifdef WITH_OPENSSL
3164: int
3165: sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
3166: {
3167: BN_CTX *bnctx;
3168: EC_POINT *nq = NULL;
3169: BIGNUM *order, *x, *y, *tmp;
3170: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
1.40 djm 3171:
3172: /*
3173: * NB. This assumes OpenSSL has already verified that the public
3174: * point lies on the curve. This is done by EC_POINT_oct2point()
3175: * implicitly calling EC_POINT_is_on_curve(). If this code is ever
3176: * reachable with public points not unmarshalled using
3177: * EC_POINT_oct2point then the caller will need to explicitly check.
3178: */
1.1 djm 3179:
3180: if ((bnctx = BN_CTX_new()) == NULL)
3181: return SSH_ERR_ALLOC_FAIL;
3182: BN_CTX_start(bnctx);
3183:
3184: /*
3185: * We shouldn't ever hit this case because bignum_get_ecpoint()
3186: * refuses to load GF2m points.
3187: */
3188: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3189: NID_X9_62_prime_field)
3190: goto out;
3191:
3192: /* Q != infinity */
3193: if (EC_POINT_is_at_infinity(group, public))
3194: goto out;
3195:
3196: if ((x = BN_CTX_get(bnctx)) == NULL ||
3197: (y = BN_CTX_get(bnctx)) == NULL ||
3198: (order = BN_CTX_get(bnctx)) == NULL ||
3199: (tmp = BN_CTX_get(bnctx)) == NULL) {
3200: ret = SSH_ERR_ALLOC_FAIL;
3201: goto out;
3202: }
3203:
3204: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
3205: if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
3206: EC_POINT_get_affine_coordinates_GFp(group, public,
3207: x, y, bnctx) != 1) {
3208: ret = SSH_ERR_LIBCRYPTO_ERROR;
3209: goto out;
3210: }
3211: if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
3212: BN_num_bits(y) <= BN_num_bits(order) / 2)
3213: goto out;
3214:
3215: /* nQ == infinity (n == order of subgroup) */
3216: if ((nq = EC_POINT_new(group)) == NULL) {
3217: ret = SSH_ERR_ALLOC_FAIL;
3218: goto out;
3219: }
3220: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
3221: ret = SSH_ERR_LIBCRYPTO_ERROR;
3222: goto out;
3223: }
3224: if (EC_POINT_is_at_infinity(group, nq) != 1)
3225: goto out;
3226:
3227: /* x < order - 1, y < order - 1 */
3228: if (!BN_sub(tmp, order, BN_value_one())) {
3229: ret = SSH_ERR_LIBCRYPTO_ERROR;
3230: goto out;
3231: }
3232: if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
3233: goto out;
3234: ret = 0;
3235: out:
3236: BN_CTX_free(bnctx);
1.60 jsing 3237: EC_POINT_free(nq);
1.1 djm 3238: return ret;
3239: }
3240:
3241: int
3242: sshkey_ec_validate_private(const EC_KEY *key)
3243: {
3244: BN_CTX *bnctx;
3245: BIGNUM *order, *tmp;
3246: int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
3247:
3248: if ((bnctx = BN_CTX_new()) == NULL)
3249: return SSH_ERR_ALLOC_FAIL;
3250: BN_CTX_start(bnctx);
3251:
3252: if ((order = BN_CTX_get(bnctx)) == NULL ||
3253: (tmp = BN_CTX_get(bnctx)) == NULL) {
3254: ret = SSH_ERR_ALLOC_FAIL;
3255: goto out;
3256: }
3257:
3258: /* log2(private) > log2(order)/2 */
3259: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
3260: ret = SSH_ERR_LIBCRYPTO_ERROR;
3261: goto out;
3262: }
3263: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
3264: BN_num_bits(order) / 2)
3265: goto out;
3266:
3267: /* private < order - 1 */
3268: if (!BN_sub(tmp, order, BN_value_one())) {
3269: ret = SSH_ERR_LIBCRYPTO_ERROR;
3270: goto out;
3271: }
3272: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
3273: goto out;
3274: ret = 0;
3275: out:
3276: BN_CTX_free(bnctx);
3277: return ret;
3278: }
3279:
3280: void
3281: sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
3282: {
3283: BIGNUM *x, *y;
3284: BN_CTX *bnctx;
3285:
3286: if (point == NULL) {
3287: fputs("point=(NULL)\n", stderr);
3288: return;
3289: }
3290: if ((bnctx = BN_CTX_new()) == NULL) {
3291: fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
3292: return;
3293: }
3294: BN_CTX_start(bnctx);
3295: if ((x = BN_CTX_get(bnctx)) == NULL ||
3296: (y = BN_CTX_get(bnctx)) == NULL) {
3297: fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
3298: return;
3299: }
3300: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
3301: NID_X9_62_prime_field) {
3302: fprintf(stderr, "%s: group is not a prime field\n", __func__);
3303: return;
3304: }
3305: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
3306: bnctx) != 1) {
3307: fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
3308: __func__);
3309: return;
3310: }
3311: fputs("x=", stderr);
3312: BN_print_fp(stderr, x);
3313: fputs("\ny=", stderr);
3314: BN_print_fp(stderr, y);
3315: fputs("\n", stderr);
3316: BN_CTX_free(bnctx);
3317: }
3318:
3319: void
3320: sshkey_dump_ec_key(const EC_KEY *key)
3321: {
3322: const BIGNUM *exponent;
3323:
3324: sshkey_dump_ec_point(EC_KEY_get0_group(key),
3325: EC_KEY_get0_public_key(key));
3326: fputs("exponent=", stderr);
3327: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
3328: fputs("(NULL)", stderr);
3329: else
3330: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
3331: fputs("\n", stderr);
3332: }
3333: #endif /* WITH_OPENSSL */
3334:
3335: static int
3336: sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
3337: const char *passphrase, const char *comment, const char *ciphername,
3338: int rounds)
3339: {
1.4 djm 3340: u_char *cp, *key = NULL, *pubkeyblob = NULL;
1.1 djm 3341: u_char salt[SALT_LEN];
1.4 djm 3342: char *b64 = NULL;
1.1 djm 3343: size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
3344: u_int check;
3345: int r = SSH_ERR_INTERNAL_ERROR;
1.36 djm 3346: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3347: const struct sshcipher *cipher;
3348: const char *kdfname = KDFNAME;
3349: struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3350:
3351: if (rounds <= 0)
3352: rounds = DEFAULT_ROUNDS;
3353: if (passphrase == NULL || !strlen(passphrase)) {
3354: ciphername = "none";
3355: kdfname = "none";
3356: } else if (ciphername == NULL)
3357: ciphername = DEFAULT_CIPHERNAME;
1.47 djm 3358: if ((cipher = cipher_by_name(ciphername)) == NULL) {
1.1 djm 3359: r = SSH_ERR_INVALID_ARGUMENT;
3360: goto out;
3361: }
3362:
3363: if ((kdf = sshbuf_new()) == NULL ||
3364: (encoded = sshbuf_new()) == NULL ||
3365: (encrypted = sshbuf_new()) == NULL) {
3366: r = SSH_ERR_ALLOC_FAIL;
3367: goto out;
3368: }
3369: blocksize = cipher_blocksize(cipher);
3370: keylen = cipher_keylen(cipher);
3371: ivlen = cipher_ivlen(cipher);
3372: authlen = cipher_authlen(cipher);
3373: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3374: r = SSH_ERR_ALLOC_FAIL;
3375: goto out;
3376: }
3377: if (strcmp(kdfname, "bcrypt") == 0) {
3378: arc4random_buf(salt, SALT_LEN);
3379: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3380: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3381: r = SSH_ERR_INVALID_ARGUMENT;
3382: goto out;
3383: }
3384: if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3385: (r = sshbuf_put_u32(kdf, rounds)) != 0)
3386: goto out;
3387: } else if (strcmp(kdfname, "none") != 0) {
3388: /* Unsupported KDF type */
3389: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3390: goto out;
3391: }
3392: if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3393: key + keylen, ivlen, 1)) != 0)
3394: goto out;
3395:
3396: if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3397: (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3398: (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3399: (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3400: (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3401: (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3402: (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3403: goto out;
3404:
3405: /* set up the buffer that will be encrypted */
3406:
3407: /* Random check bytes */
3408: check = arc4random();
3409: if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3410: (r = sshbuf_put_u32(encrypted, check)) != 0)
3411: goto out;
3412:
3413: /* append private key and comment*/
1.62 markus 3414: if ((r = sshkey_private_serialize_opt(prv, encrypted,
3415: SSHKEY_SERIALIZE_FULL)) != 0 ||
1.1 djm 3416: (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3417: goto out;
3418:
3419: /* padding */
3420: i = 0;
3421: while (sshbuf_len(encrypted) % blocksize) {
3422: if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3423: goto out;
3424: }
3425:
3426: /* length in destination buffer */
3427: if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3428: goto out;
3429:
3430: /* encrypt */
3431: if ((r = sshbuf_reserve(encoded,
3432: sshbuf_len(encrypted) + authlen, &cp)) != 0)
3433: goto out;
1.36 djm 3434: if ((r = cipher_crypt(ciphercontext, 0, cp,
1.1 djm 3435: sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3436: goto out;
3437:
3438: /* uuencode */
3439: if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3440: r = SSH_ERR_ALLOC_FAIL;
3441: goto out;
3442: }
3443:
3444: sshbuf_reset(blob);
3445: if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3446: goto out;
3447: for (i = 0; i < strlen(b64); i++) {
3448: if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3449: goto out;
3450: /* insert line breaks */
3451: if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3452: goto out;
3453: }
3454: if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3455: goto out;
3456: if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3457: goto out;
3458:
3459: /* success */
3460: r = 0;
3461:
3462: out:
3463: sshbuf_free(kdf);
3464: sshbuf_free(encoded);
3465: sshbuf_free(encrypted);
1.36 djm 3466: cipher_free(ciphercontext);
1.1 djm 3467: explicit_bzero(salt, sizeof(salt));
3468: if (key != NULL) {
3469: explicit_bzero(key, keylen + ivlen);
3470: free(key);
3471: }
3472: if (pubkeyblob != NULL) {
3473: explicit_bzero(pubkeyblob, pubkeylen);
3474: free(pubkeyblob);
3475: }
3476: if (b64 != NULL) {
3477: explicit_bzero(b64, strlen(b64));
3478: free(b64);
3479: }
3480: return r;
3481: }
3482:
3483: static int
3484: sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3485: struct sshkey **keyp, char **commentp)
3486: {
3487: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3488: const struct sshcipher *cipher = NULL;
3489: const u_char *cp;
3490: int r = SSH_ERR_INTERNAL_ERROR;
3491: size_t encoded_len;
1.18 djm 3492: size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
1.1 djm 3493: struct sshbuf *encoded = NULL, *decoded = NULL;
3494: struct sshbuf *kdf = NULL, *decrypted = NULL;
1.36 djm 3495: struct sshcipher_ctx *ciphercontext = NULL;
1.1 djm 3496: struct sshkey *k = NULL;
3497: u_char *key = NULL, *salt = NULL, *dp, pad, last;
3498: u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3499:
3500: if (keyp != NULL)
3501: *keyp = NULL;
3502: if (commentp != NULL)
3503: *commentp = NULL;
3504:
3505: if ((encoded = sshbuf_new()) == NULL ||
3506: (decoded = sshbuf_new()) == NULL ||
3507: (decrypted = sshbuf_new()) == NULL) {
3508: r = SSH_ERR_ALLOC_FAIL;
3509: goto out;
3510: }
3511:
3512: /* check preamble */
3513: cp = sshbuf_ptr(blob);
3514: encoded_len = sshbuf_len(blob);
3515: if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3516: memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3517: r = SSH_ERR_INVALID_FORMAT;
3518: goto out;
3519: }
3520: cp += MARK_BEGIN_LEN;
3521: encoded_len -= MARK_BEGIN_LEN;
3522:
3523: /* Look for end marker, removing whitespace as we go */
3524: while (encoded_len > 0) {
3525: if (*cp != '\n' && *cp != '\r') {
3526: if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3527: goto out;
3528: }
3529: last = *cp;
3530: encoded_len--;
3531: cp++;
3532: if (last == '\n') {
3533: if (encoded_len >= MARK_END_LEN &&
3534: memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3535: /* \0 terminate */
3536: if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3537: goto out;
3538: break;
3539: }
3540: }
3541: }
3542: if (encoded_len == 0) {
3543: r = SSH_ERR_INVALID_FORMAT;
3544: goto out;
3545: }
3546:
3547: /* decode base64 */
1.4 djm 3548: if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
1.1 djm 3549: goto out;
3550:
3551: /* check magic */
3552: if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3553: memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3554: r = SSH_ERR_INVALID_FORMAT;
3555: goto out;
3556: }
3557: /* parse public portion of key */
3558: if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3559: (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3560: (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3561: (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3562: (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3563: (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3564: (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3565: goto out;
3566:
3567: if ((cipher = cipher_by_name(ciphername)) == NULL) {
3568: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3569: goto out;
3570: }
3571: if ((passphrase == NULL || strlen(passphrase) == 0) &&
3572: strcmp(ciphername, "none") != 0) {
3573: /* passphrase required */
3574: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3575: goto out;
3576: }
3577: if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3578: r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3579: goto out;
3580: }
3581: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3582: r = SSH_ERR_INVALID_FORMAT;
3583: goto out;
3584: }
3585: if (nkeys != 1) {
3586: /* XXX only one key supported */
3587: r = SSH_ERR_INVALID_FORMAT;
3588: goto out;
3589: }
3590:
3591: /* check size of encrypted key blob */
3592: blocksize = cipher_blocksize(cipher);
3593: if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3594: r = SSH_ERR_INVALID_FORMAT;
3595: goto out;
3596: }
3597:
3598: /* setup key */
3599: keylen = cipher_keylen(cipher);
3600: ivlen = cipher_ivlen(cipher);
1.18 djm 3601: authlen = cipher_authlen(cipher);
1.1 djm 3602: if ((key = calloc(1, keylen + ivlen)) == NULL) {
3603: r = SSH_ERR_ALLOC_FAIL;
3604: goto out;
3605: }
3606: if (strcmp(kdfname, "bcrypt") == 0) {
3607: if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3608: (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3609: goto out;
3610: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3611: key, keylen + ivlen, rounds) < 0) {
3612: r = SSH_ERR_INVALID_FORMAT;
3613: goto out;
3614: }
3615: }
3616:
1.18 djm 3617: /* check that an appropriate amount of auth data is present */
3618: if (sshbuf_len(decoded) < encrypted_len + authlen) {
3619: r = SSH_ERR_INVALID_FORMAT;
3620: goto out;
3621: }
3622:
1.1 djm 3623: /* decrypt private portion of key */
3624: if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3625: (r = cipher_init(&ciphercontext, cipher, key, keylen,
3626: key + keylen, ivlen, 0)) != 0)
3627: goto out;
1.36 djm 3628: if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
1.18 djm 3629: encrypted_len, 0, authlen)) != 0) {
1.1 djm 3630: /* an integrity error here indicates an incorrect passphrase */
3631: if (r == SSH_ERR_MAC_INVALID)
3632: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3633: goto out;
3634: }
1.18 djm 3635: if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
1.1 djm 3636: goto out;
3637: /* there should be no trailing data */
3638: if (sshbuf_len(decoded) != 0) {
3639: r = SSH_ERR_INVALID_FORMAT;
3640: goto out;
3641: }
3642:
3643: /* check check bytes */
3644: if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3645: (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3646: goto out;
3647: if (check1 != check2) {
3648: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3649: goto out;
3650: }
3651:
3652: /* Load the private key and comment */
3653: if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3654: (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3655: goto out;
3656:
3657: /* Check deterministic padding */
3658: i = 0;
3659: while (sshbuf_len(decrypted)) {
3660: if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3661: goto out;
3662: if (pad != (++i & 0xff)) {
3663: r = SSH_ERR_INVALID_FORMAT;
3664: goto out;
3665: }
3666: }
3667:
3668: /* XXX decode pubkey and check against private */
3669:
3670: /* success */
3671: r = 0;
3672: if (keyp != NULL) {
3673: *keyp = k;
3674: k = NULL;
3675: }
3676: if (commentp != NULL) {
3677: *commentp = comment;
3678: comment = NULL;
3679: }
3680: out:
3681: pad = 0;
1.36 djm 3682: cipher_free(ciphercontext);
1.1 djm 3683: free(ciphername);
3684: free(kdfname);
3685: free(comment);
3686: if (salt != NULL) {
3687: explicit_bzero(salt, slen);
3688: free(salt);
3689: }
3690: if (key != NULL) {
3691: explicit_bzero(key, keylen + ivlen);
3692: free(key);
3693: }
3694: sshbuf_free(encoded);
3695: sshbuf_free(decoded);
3696: sshbuf_free(kdf);
3697: sshbuf_free(decrypted);
3698: sshkey_free(k);
3699: return r;
3700: }
3701:
3702:
3703: #ifdef WITH_OPENSSL
3704: /* convert SSH v2 key in OpenSSL PEM format */
3705: static int
3706: sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3707: const char *_passphrase, const char *comment)
3708: {
3709: int success, r;
3710: int blen, len = strlen(_passphrase);
3711: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3712: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.57 djm 3713: char *bptr;
1.1 djm 3714: BIO *bio = NULL;
3715:
3716: if (len > 0 && len <= 4)
3717: return SSH_ERR_PASSPHRASE_TOO_SHORT;
3718: if ((bio = BIO_new(BIO_s_mem())) == NULL)
3719: return SSH_ERR_ALLOC_FAIL;
3720:
3721: switch (key->type) {
3722: case KEY_DSA:
3723: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3724: cipher, passphrase, len, NULL, NULL);
3725: break;
3726: case KEY_ECDSA:
3727: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3728: cipher, passphrase, len, NULL, NULL);
3729: break;
3730: case KEY_RSA:
3731: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3732: cipher, passphrase, len, NULL, NULL);
3733: break;
3734: default:
3735: success = 0;
3736: break;
3737: }
3738: if (success == 0) {
3739: r = SSH_ERR_LIBCRYPTO_ERROR;
3740: goto out;
3741: }
3742: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3743: r = SSH_ERR_INTERNAL_ERROR;
3744: goto out;
3745: }
3746: if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3747: goto out;
3748: r = 0;
3749: out:
3750: BIO_free(bio);
3751: return r;
3752: }
3753: #endif /* WITH_OPENSSL */
3754:
3755: /* Serialise "key" to buffer "blob" */
3756: int
3757: sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3758: const char *passphrase, const char *comment,
3759: int force_new_format, const char *new_format_cipher, int new_format_rounds)
3760: {
3761: switch (key->type) {
1.9 markus 3762: #ifdef WITH_OPENSSL
1.1 djm 3763: case KEY_DSA:
3764: case KEY_ECDSA:
3765: case KEY_RSA:
3766: if (force_new_format) {
3767: return sshkey_private_to_blob2(key, blob, passphrase,
3768: comment, new_format_cipher, new_format_rounds);
3769: }
3770: return sshkey_private_pem_to_blob(key, blob,
3771: passphrase, comment);
3772: #endif /* WITH_OPENSSL */
3773: case KEY_ED25519:
1.62 markus 3774: #ifdef WITH_XMSS
3775: case KEY_XMSS:
3776: #endif /* WITH_XMSS */
1.1 djm 3777: return sshkey_private_to_blob2(key, blob, passphrase,
3778: comment, new_format_cipher, new_format_rounds);
3779: default:
3780: return SSH_ERR_KEY_TYPE_UNKNOWN;
3781: }
3782: }
3783:
3784:
3785: #ifdef WITH_OPENSSL
1.8 djm 3786: static int
1.52 djm 3787: translate_libcrypto_error(unsigned long pem_err)
3788: {
3789: int pem_reason = ERR_GET_REASON(pem_err);
3790:
3791: switch (ERR_GET_LIB(pem_err)) {
3792: case ERR_LIB_PEM:
3793: switch (pem_reason) {
3794: case PEM_R_BAD_PASSWORD_READ:
3795: case PEM_R_PROBLEMS_GETTING_PASSWORD:
3796: case PEM_R_BAD_DECRYPT:
3797: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3798: default:
3799: return SSH_ERR_INVALID_FORMAT;
3800: }
3801: case ERR_LIB_EVP:
3802: switch (pem_reason) {
3803: case EVP_R_BAD_DECRYPT:
3804: return SSH_ERR_KEY_WRONG_PASSPHRASE;
1.69 djm 3805: #ifdef EVP_R_BN_DECODE_ERROR
1.52 djm 3806: case EVP_R_BN_DECODE_ERROR:
1.69 djm 3807: #endif
1.52 djm 3808: case EVP_R_DECODE_ERROR:
3809: #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
3810: case EVP_R_PRIVATE_KEY_DECODE_ERROR:
3811: #endif
3812: return SSH_ERR_INVALID_FORMAT;
3813: default:
3814: return SSH_ERR_LIBCRYPTO_ERROR;
3815: }
3816: case ERR_LIB_ASN1:
3817: return SSH_ERR_INVALID_FORMAT;
3818: }
3819: return SSH_ERR_LIBCRYPTO_ERROR;
3820: }
3821:
3822: static void
3823: clear_libcrypto_errors(void)
3824: {
3825: while (ERR_get_error() != 0)
3826: ;
3827: }
3828:
3829: /*
3830: * Translate OpenSSL error codes to determine whether
3831: * passphrase is required/incorrect.
3832: */
3833: static int
3834: convert_libcrypto_error(void)
3835: {
3836: /*
3837: * Some password errors are reported at the beginning
3838: * of the error queue.
3839: */
3840: if (translate_libcrypto_error(ERR_peek_error()) ==
3841: SSH_ERR_KEY_WRONG_PASSPHRASE)
3842: return SSH_ERR_KEY_WRONG_PASSPHRASE;
3843: return translate_libcrypto_error(ERR_peek_last_error());
3844: }
3845:
3846: static int
1.1 djm 3847: sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
1.8 djm 3848: const char *passphrase, struct sshkey **keyp)
1.1 djm 3849: {
3850: EVP_PKEY *pk = NULL;
3851: struct sshkey *prv = NULL;
3852: BIO *bio = NULL;
3853: int r;
3854:
1.32 djm 3855: if (keyp != NULL)
3856: *keyp = NULL;
1.1 djm 3857:
3858: if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3859: return SSH_ERR_ALLOC_FAIL;
3860: if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3861: (int)sshbuf_len(blob)) {
3862: r = SSH_ERR_ALLOC_FAIL;
3863: goto out;
3864: }
3865:
1.52 djm 3866: clear_libcrypto_errors();
1.1 djm 3867: if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3868: (char *)passphrase)) == NULL) {
1.71 djm 3869: /*
3870: * libcrypto may return various ASN.1 errors when attempting
3871: * to parse a key with an incorrect passphrase.
3872: * Treat all format errors as "incorrect passphrase" if a
3873: * passphrase was supplied.
3874: */
3875: if (passphrase != NULL && *passphrase != '\0')
3876: r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3877: else
3878: r = convert_libcrypto_error();
1.1 djm 3879: goto out;
3880: }
1.69 djm 3881: if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
1.1 djm 3882: (type == KEY_UNSPEC || type == KEY_RSA)) {
3883: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3884: r = SSH_ERR_ALLOC_FAIL;
3885: goto out;
3886: }
3887: prv->rsa = EVP_PKEY_get1_RSA(pk);
3888: prv->type = KEY_RSA;
3889: #ifdef DEBUG_PK
3890: RSA_print_fp(stderr, prv->rsa, 8);
3891: #endif
3892: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3893: r = SSH_ERR_LIBCRYPTO_ERROR;
1.49 djm 3894: goto out;
3895: }
1.69 djm 3896: if ((r = check_rsa_length(prv->rsa)) != 0)
1.1 djm 3897: goto out;
1.69 djm 3898: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
1.1 djm 3899: (type == KEY_UNSPEC || type == KEY_DSA)) {
3900: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3901: r = SSH_ERR_ALLOC_FAIL;
3902: goto out;
3903: }
3904: prv->dsa = EVP_PKEY_get1_DSA(pk);
3905: prv->type = KEY_DSA;
3906: #ifdef DEBUG_PK
3907: DSA_print_fp(stderr, prv->dsa, 8);
3908: #endif
1.69 djm 3909: } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
1.1 djm 3910: (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3911: if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3912: r = SSH_ERR_ALLOC_FAIL;
3913: goto out;
3914: }
3915: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3916: prv->type = KEY_ECDSA;
3917: prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3918: if (prv->ecdsa_nid == -1 ||
3919: sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3920: sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3921: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3922: sshkey_ec_validate_private(prv->ecdsa) != 0) {
3923: r = SSH_ERR_INVALID_FORMAT;
3924: goto out;
3925: }
3926: #ifdef DEBUG_PK
3927: if (prv != NULL && prv->ecdsa != NULL)
3928: sshkey_dump_ec_key(prv->ecdsa);
3929: #endif
3930: } else {
3931: r = SSH_ERR_INVALID_FORMAT;
3932: goto out;
3933: }
3934: r = 0;
1.32 djm 3935: if (keyp != NULL) {
3936: *keyp = prv;
3937: prv = NULL;
3938: }
1.1 djm 3939: out:
3940: BIO_free(bio);
1.60 jsing 3941: EVP_PKEY_free(pk);
1.30 mmcc 3942: sshkey_free(prv);
1.1 djm 3943: return r;
3944: }
3945: #endif /* WITH_OPENSSL */
3946:
3947: int
3948: sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3949: const char *passphrase, struct sshkey **keyp, char **commentp)
3950: {
1.42 djm 3951: int r = SSH_ERR_INTERNAL_ERROR;
3952:
1.32 djm 3953: if (keyp != NULL)
3954: *keyp = NULL;
1.1 djm 3955: if (commentp != NULL)
3956: *commentp = NULL;
3957:
3958: switch (type) {
1.9 markus 3959: #ifdef WITH_OPENSSL
1.1 djm 3960: case KEY_DSA:
3961: case KEY_ECDSA:
3962: case KEY_RSA:
1.8 djm 3963: return sshkey_parse_private_pem_fileblob(blob, type,
3964: passphrase, keyp);
1.1 djm 3965: #endif /* WITH_OPENSSL */
3966: case KEY_ED25519:
1.62 markus 3967: #ifdef WITH_XMSS
3968: case KEY_XMSS:
3969: #endif /* WITH_XMSS */
1.1 djm 3970: return sshkey_parse_private2(blob, type, passphrase,
3971: keyp, commentp);
3972: case KEY_UNSPEC:
1.42 djm 3973: r = sshkey_parse_private2(blob, type, passphrase, keyp,
3974: commentp);
3975: /* Do not fallback to PEM parser if only passphrase is wrong. */
3976: if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE)
3977: return r;
1.1 djm 3978: #ifdef WITH_OPENSSL
1.8 djm 3979: return sshkey_parse_private_pem_fileblob(blob, type,
3980: passphrase, keyp);
1.1 djm 3981: #else
3982: return SSH_ERR_INVALID_FORMAT;
3983: #endif /* WITH_OPENSSL */
3984: default:
3985: return SSH_ERR_KEY_TYPE_UNKNOWN;
3986: }
3987: }
3988:
3989: int
3990: sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
1.23 tim 3991: struct sshkey **keyp, char **commentp)
1.1 djm 3992: {
3993: if (keyp != NULL)
3994: *keyp = NULL;
3995: if (commentp != NULL)
3996: *commentp = NULL;
3997:
1.23 tim 3998: return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3999: passphrase, keyp, commentp);
1.1 djm 4000: }
1.62 markus 4001:
4002: #ifdef WITH_XMSS
4003: /*
4004: * serialize the key with the current state and forward the state
4005: * maxsign times.
4006: */
4007: int
4008: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4009: u_int32_t maxsign, sshkey_printfn *pr)
4010: {
4011: int r, rupdate;
4012:
4013: if (maxsign == 0 ||
4014: sshkey_type_plain(k->type) != KEY_XMSS)
4015: return sshkey_private_serialize_opt(k, b,
4016: SSHKEY_SERIALIZE_DEFAULT);
4017: if ((r = sshkey_xmss_get_state(k, pr)) != 0 ||
4018: (r = sshkey_private_serialize_opt(k, b,
4019: SSHKEY_SERIALIZE_STATE)) != 0 ||
4020: (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
4021: goto out;
4022: r = 0;
4023: out:
4024: if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) {
4025: if (r == 0)
4026: r = rupdate;
4027: }
4028: return r;
4029: }
4030:
4031: u_int32_t
4032: sshkey_signatures_left(const struct sshkey *k)
4033: {
4034: if (sshkey_type_plain(k->type) == KEY_XMSS)
4035: return sshkey_xmss_signatures_left(k);
4036: return 0;
4037: }
4038:
4039: int
4040: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4041: {
4042: if (sshkey_type_plain(k->type) != KEY_XMSS)
4043: return SSH_ERR_INVALID_ARGUMENT;
4044: return sshkey_xmss_enable_maxsign(k, maxsign);
4045: }
4046:
4047: int
4048: sshkey_set_filename(struct sshkey *k, const char *filename)
4049: {
4050: if (k == NULL)
4051: return SSH_ERR_INVALID_ARGUMENT;
4052: if (sshkey_type_plain(k->type) != KEY_XMSS)
4053: return 0;
4054: if (filename == NULL)
4055: return SSH_ERR_INVALID_ARGUMENT;
4056: if ((k->xmss_filename = strdup(filename)) == NULL)
4057: return SSH_ERR_ALLOC_FAIL;
4058: return 0;
4059: }
4060: #else
4061: int
4062: sshkey_private_serialize_maxsign(const struct sshkey *k, struct sshbuf *b,
4063: u_int32_t maxsign, sshkey_printfn *pr)
4064: {
4065: return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
4066: }
4067:
4068: u_int32_t
4069: sshkey_signatures_left(const struct sshkey *k)
4070: {
4071: return 0;
4072: }
4073:
4074: int
4075: sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
4076: {
4077: return SSH_ERR_INVALID_ARGUMENT;
4078: }
4079:
4080: int
4081: sshkey_set_filename(struct sshkey *k, const char *filename)
4082: {
4083: if (k == NULL)
4084: return SSH_ERR_INVALID_ARGUMENT;
4085: return 0;
4086: }
4087: #endif /* WITH_XMSS */
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