1 /* $OpenBSD: sshkey.c,v 1.21 2015/08/19 23:19:01 djm Exp $ */
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.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
30 #include <sys/param.h> /* MIN MAX */
31 #include <sys/types.h>
32 #include <netinet/in.h>
35 #include <openssl/evp.h>
36 #include <openssl/err.h>
37 #include <openssl/pem.h>
40 #include "crypto_api.h"
49 #endif /* HAVE_UTIL_H */
58 #define SSHKEY_INTERNAL
62 /* openssh private key file format */
63 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
64 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
65 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
66 #define MARK_END_LEN (sizeof(MARK_END) - 1)
67 #define KDFNAME "bcrypt"
68 #define AUTH_MAGIC "openssh-key-v1"
70 #define DEFAULT_CIPHERNAME "aes256-cbc"
71 #define DEFAULT_ROUNDS 16
73 /* Version identification string for SSH v1 identity files. */
74 #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
76 static int sshkey_from_blob_internal(struct sshbuf *buf,
77 struct sshkey **keyp, int allow_cert);
79 /* Supported key types */
82 const char *shortname;
87 static const struct keytype keytypes[] = {
88 { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
89 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
90 KEY_ED25519_CERT, 0, 1 },
92 { NULL, "RSA1", KEY_RSA1, 0, 0 },
93 { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
94 { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
95 # ifdef OPENSSL_HAS_ECC
96 { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
97 { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
98 # ifdef OPENSSL_HAS_NISTP521
99 { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
100 # endif /* OPENSSL_HAS_NISTP521 */
101 # endif /* OPENSSL_HAS_ECC */
102 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
103 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
104 # ifdef OPENSSL_HAS_ECC
105 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
106 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
107 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
108 KEY_ECDSA_CERT, NID_secp384r1, 1 },
109 # ifdef OPENSSL_HAS_NISTP521
110 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
111 KEY_ECDSA_CERT, NID_secp521r1, 1 },
112 # endif /* OPENSSL_HAS_NISTP521 */
113 # endif /* OPENSSL_HAS_ECC */
114 #endif /* WITH_OPENSSL */
115 { NULL, NULL, -1, -1, 0 }
119 sshkey_type(const struct sshkey *k)
121 const struct keytype *kt;
123 for (kt = keytypes; kt->type != -1; kt++) {
124 if (kt->type == k->type)
125 return kt->shortname;
131 sshkey_ssh_name_from_type_nid(int type, int nid)
133 const struct keytype *kt;
135 for (kt = keytypes; kt->type != -1; kt++) {
136 if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
139 return "ssh-unknown";
143 sshkey_type_is_cert(int type)
145 const struct keytype *kt;
147 for (kt = keytypes; kt->type != -1; kt++) {
148 if (kt->type == type)
155 sshkey_ssh_name(const struct sshkey *k)
157 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
161 sshkey_ssh_name_plain(const struct sshkey *k)
163 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
168 sshkey_type_from_name(const char *name)
170 const struct keytype *kt;
172 for (kt = keytypes; kt->type != -1; kt++) {
173 /* Only allow shortname matches for plain key types */
174 if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
175 (!kt->cert && strcasecmp(kt->shortname, name) == 0))
182 sshkey_ecdsa_nid_from_name(const char *name)
184 const struct keytype *kt;
186 for (kt = keytypes; kt->type != -1; kt++) {
187 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
189 if (kt->name != NULL && strcmp(name, kt->name) == 0)
196 key_alg_list(int certs_only, int plain_only)
198 char *tmp, *ret = NULL;
199 size_t nlen, rlen = 0;
200 const struct keytype *kt;
202 for (kt = keytypes; kt->type != -1; kt++) {
203 if (kt->name == NULL)
205 if ((certs_only && !kt->cert) || (plain_only && kt->cert))
209 nlen = strlen(kt->name);
210 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
215 memcpy(ret + rlen, kt->name, nlen + 1);
222 sshkey_names_valid2(const char *names, int allow_wildcard)
225 const struct keytype *kt;
228 if (names == NULL || strcmp(names, "") == 0)
230 if ((s = cp = strdup(names)) == NULL)
232 for ((p = strsep(&cp, ",")); p && *p != '\0';
233 (p = strsep(&cp, ","))) {
234 type = sshkey_type_from_name(p);
235 if (type == KEY_RSA1) {
239 if (type == KEY_UNSPEC) {
240 if (allow_wildcard) {
242 * Try matching key types against the string.
243 * If any has a positive or negative match then
244 * the component is accepted.
246 for (kt = keytypes; kt->type != -1; kt++) {
247 if (kt->type == KEY_RSA1)
249 if (match_pattern_list(kt->name,
265 sshkey_size(const struct sshkey *k)
272 return BN_num_bits(k->rsa->n);
275 return BN_num_bits(k->dsa->p);
278 return sshkey_curve_nid_to_bits(k->ecdsa_nid);
279 #endif /* WITH_OPENSSL */
281 case KEY_ED25519_CERT:
282 return 256; /* XXX */
288 sshkey_type_is_valid_ca(int type)
302 sshkey_is_cert(const struct sshkey *k)
306 return sshkey_type_is_cert(k->type);
309 /* Return the cert-less equivalent to a certified key type */
311 sshkey_type_plain(int type)
320 case KEY_ED25519_CERT:
328 /* XXX: these are really begging for a table-driven approach */
330 sshkey_curve_name_to_nid(const char *name)
332 if (strcmp(name, "nistp256") == 0)
333 return NID_X9_62_prime256v1;
334 else if (strcmp(name, "nistp384") == 0)
335 return NID_secp384r1;
336 # ifdef OPENSSL_HAS_NISTP521
337 else if (strcmp(name, "nistp521") == 0)
338 return NID_secp521r1;
339 # endif /* OPENSSL_HAS_NISTP521 */
345 sshkey_curve_nid_to_bits(int nid)
348 case NID_X9_62_prime256v1:
352 # ifdef OPENSSL_HAS_NISTP521
355 # endif /* OPENSSL_HAS_NISTP521 */
362 sshkey_ecdsa_bits_to_nid(int bits)
366 return NID_X9_62_prime256v1;
368 return NID_secp384r1;
369 # ifdef OPENSSL_HAS_NISTP521
371 return NID_secp521r1;
372 # endif /* OPENSSL_HAS_NISTP521 */
379 sshkey_curve_nid_to_name(int nid)
382 case NID_X9_62_prime256v1:
386 # ifdef OPENSSL_HAS_NISTP521
389 # endif /* OPENSSL_HAS_NISTP521 */
396 sshkey_ec_nid_to_hash_alg(int nid)
398 int kbits = sshkey_curve_nid_to_bits(nid);
403 /* RFC5656 section 6.2.1 */
405 return SSH_DIGEST_SHA256;
406 else if (kbits <= 384)
407 return SSH_DIGEST_SHA384;
409 return SSH_DIGEST_SHA512;
411 #endif /* WITH_OPENSSL */
414 cert_free(struct sshkey_cert *cert)
420 if (cert->certblob != NULL)
421 sshbuf_free(cert->certblob);
422 if (cert->critical != NULL)
423 sshbuf_free(cert->critical);
424 if (cert->extensions != NULL)
425 sshbuf_free(cert->extensions);
426 if (cert->key_id != NULL)
428 for (i = 0; i < cert->nprincipals; i++)
429 free(cert->principals[i]);
430 if (cert->principals != NULL)
431 free(cert->principals);
432 if (cert->signature_key != NULL)
433 sshkey_free(cert->signature_key);
434 explicit_bzero(cert, sizeof(*cert));
438 static struct sshkey_cert *
441 struct sshkey_cert *cert;
443 if ((cert = calloc(1, sizeof(*cert))) == NULL)
445 if ((cert->certblob = sshbuf_new()) == NULL ||
446 (cert->critical = sshbuf_new()) == NULL ||
447 (cert->extensions = sshbuf_new()) == NULL) {
452 cert->principals = NULL;
453 cert->signature_key = NULL;
464 #endif /* WITH_OPENSSL */
466 if ((k = calloc(1, sizeof(*k))) == NULL)
474 k->ed25519_sk = NULL;
475 k->ed25519_pk = NULL;
481 if ((rsa = RSA_new()) == NULL ||
482 (rsa->n = BN_new()) == NULL ||
483 (rsa->e = BN_new()) == NULL) {
493 if ((dsa = DSA_new()) == NULL ||
494 (dsa->p = BN_new()) == NULL ||
495 (dsa->q = BN_new()) == NULL ||
496 (dsa->g = BN_new()) == NULL ||
497 (dsa->pub_key = BN_new()) == NULL) {
507 /* Cannot do anything until we know the group */
509 #endif /* WITH_OPENSSL */
511 case KEY_ED25519_CERT:
512 /* no need to prealloc */
522 if (sshkey_is_cert(k)) {
523 if ((k->cert = cert_new()) == NULL) {
533 sshkey_add_private(struct sshkey *k)
540 #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
541 if (bn_maybe_alloc_failed(k->rsa->d) ||
542 bn_maybe_alloc_failed(k->rsa->iqmp) ||
543 bn_maybe_alloc_failed(k->rsa->q) ||
544 bn_maybe_alloc_failed(k->rsa->p) ||
545 bn_maybe_alloc_failed(k->rsa->dmq1) ||
546 bn_maybe_alloc_failed(k->rsa->dmp1))
547 return SSH_ERR_ALLOC_FAIL;
551 if (bn_maybe_alloc_failed(k->dsa->priv_key))
552 return SSH_ERR_ALLOC_FAIL;
554 #undef bn_maybe_alloc_failed
557 /* Cannot do anything until we know the group */
559 #endif /* WITH_OPENSSL */
561 case KEY_ED25519_CERT:
562 /* no need to prealloc */
567 return SSH_ERR_INVALID_ARGUMENT;
573 sshkey_new_private(int type)
575 struct sshkey *k = sshkey_new(type);
579 if (sshkey_add_private(k) != 0) {
587 sshkey_free(struct sshkey *k)
606 # ifdef OPENSSL_HAS_ECC
609 if (k->ecdsa != NULL)
610 EC_KEY_free(k->ecdsa);
613 # endif /* OPENSSL_HAS_ECC */
614 #endif /* WITH_OPENSSL */
616 case KEY_ED25519_CERT:
618 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
620 k->ed25519_pk = NULL;
623 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
625 k->ed25519_sk = NULL;
633 if (sshkey_is_cert(k))
635 explicit_bzero(k, sizeof(*k));
640 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
642 if (a == NULL && b == NULL)
644 if (a == NULL || b == NULL)
646 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
648 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
649 sshbuf_len(a->certblob)) != 0)
655 * Compare public portions of key only, allowing comparisons between
656 * certificates and plain keys too.
659 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
661 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
663 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
665 if (a == NULL || b == NULL ||
666 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
674 return a->rsa != NULL && b->rsa != NULL &&
675 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
676 BN_cmp(a->rsa->n, b->rsa->n) == 0;
679 return a->dsa != NULL && b->dsa != NULL &&
680 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
681 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
682 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
683 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
684 # ifdef OPENSSL_HAS_ECC
687 if (a->ecdsa == NULL || b->ecdsa == NULL ||
688 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
689 EC_KEY_get0_public_key(b->ecdsa) == NULL)
691 if ((bnctx = BN_CTX_new()) == NULL)
693 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
694 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
695 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
696 EC_KEY_get0_public_key(a->ecdsa),
697 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
703 # endif /* OPENSSL_HAS_ECC */
704 #endif /* WITH_OPENSSL */
706 case KEY_ED25519_CERT:
707 return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
708 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
716 sshkey_equal(const struct sshkey *a, const struct sshkey *b)
718 if (a == NULL || b == NULL || a->type != b->type)
720 if (sshkey_is_cert(a)) {
721 if (!cert_compare(a->cert, b->cert))
724 return sshkey_equal_public(a, b);
728 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
730 int type, ret = SSH_ERR_INTERNAL_ERROR;
731 const char *typename;
734 return SSH_ERR_INVALID_ARGUMENT;
736 if (sshkey_is_cert(key)) {
737 if (key->cert == NULL)
738 return SSH_ERR_EXPECTED_CERT;
739 if (sshbuf_len(key->cert->certblob) == 0)
740 return SSH_ERR_KEY_LACKS_CERTBLOB;
742 type = force_plain ? sshkey_type_plain(key->type) : key->type;
743 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
750 #endif /* WITH_OPENSSL */
751 case KEY_ED25519_CERT:
752 /* Use the existing blob */
753 /* XXX modified flag? */
754 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
759 if (key->dsa == NULL)
760 return SSH_ERR_INVALID_ARGUMENT;
761 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
762 (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
763 (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
764 (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
765 (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
768 # ifdef OPENSSL_HAS_ECC
770 if (key->ecdsa == NULL)
771 return SSH_ERR_INVALID_ARGUMENT;
772 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
773 (ret = sshbuf_put_cstring(b,
774 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
775 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
780 if (key->rsa == NULL)
781 return SSH_ERR_INVALID_ARGUMENT;
782 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
783 (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
784 (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
787 #endif /* WITH_OPENSSL */
789 if (key->ed25519_pk == NULL)
790 return SSH_ERR_INVALID_ARGUMENT;
791 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
792 (ret = sshbuf_put_string(b,
793 key->ed25519_pk, ED25519_PK_SZ)) != 0)
797 return SSH_ERR_KEY_TYPE_UNKNOWN;
803 sshkey_putb(const struct sshkey *key, struct sshbuf *b)
805 return to_blob_buf(key, b, 0);
809 sshkey_puts(const struct sshkey *key, struct sshbuf *b)
814 if ((tmp = sshbuf_new()) == NULL)
815 return SSH_ERR_ALLOC_FAIL;
816 r = to_blob_buf(key, tmp, 0);
818 r = sshbuf_put_stringb(b, tmp);
824 sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
826 return to_blob_buf(key, b, 1);
830 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
832 int ret = SSH_ERR_INTERNAL_ERROR;
834 struct sshbuf *b = NULL;
840 if ((b = sshbuf_new()) == NULL)
841 return SSH_ERR_ALLOC_FAIL;
842 if ((ret = to_blob_buf(key, b, force_plain)) != 0)
848 if ((*blobp = malloc(len)) == NULL) {
849 ret = SSH_ERR_ALLOC_FAIL;
852 memcpy(*blobp, sshbuf_ptr(b), len);
861 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
863 return to_blob(key, blobp, lenp, 0);
867 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
869 return to_blob(key, blobp, lenp, 1);
873 sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
874 u_char **retp, size_t *lenp)
876 u_char *blob = NULL, *ret = NULL;
878 int r = SSH_ERR_INTERNAL_ERROR;
884 if (ssh_digest_bytes(dgst_alg) == 0) {
885 r = SSH_ERR_INVALID_ARGUMENT;
889 if (k->type == KEY_RSA1) {
891 int nlen = BN_num_bytes(k->rsa->n);
892 int elen = BN_num_bytes(k->rsa->e);
894 blob_len = nlen + elen;
895 if (nlen >= INT_MAX - elen ||
896 (blob = malloc(blob_len)) == NULL) {
897 r = SSH_ERR_ALLOC_FAIL;
900 BN_bn2bin(k->rsa->n, blob);
901 BN_bn2bin(k->rsa->e, blob + nlen);
902 #endif /* WITH_OPENSSL */
903 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
905 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
906 r = SSH_ERR_ALLOC_FAIL;
909 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
910 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
918 *lenp = ssh_digest_bytes(dgst_alg);
923 explicit_bzero(blob, blob_len);
930 fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
933 size_t plen = strlen(alg) + 1;
934 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
937 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
939 strlcpy(ret, alg, rlen);
940 strlcat(ret, ":", rlen);
941 if (dgst_raw_len == 0)
943 if ((r = b64_ntop(dgst_raw, dgst_raw_len,
944 ret + plen, rlen - plen)) == -1) {
945 explicit_bzero(ret, rlen);
949 /* Trim padding characters from end */
950 ret[strcspn(ret, "=")] = '\0';
955 fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
957 char *retval, hex[5];
958 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
960 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
962 strlcpy(retval, alg, rlen);
963 strlcat(retval, ":", rlen);
964 for (i = 0; i < dgst_raw_len; i++) {
965 snprintf(hex, sizeof(hex), "%s%02x",
966 i > 0 ? ":" : "", dgst_raw[i]);
967 strlcat(retval, hex, rlen);
973 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
975 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
976 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
977 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
978 u_int i, j = 0, rounds, seed = 1;
981 rounds = (dgst_raw_len / 2) + 1;
982 if ((retval = calloc(rounds, 6)) == NULL)
985 for (i = 0; i < rounds; i++) {
986 u_int idx0, idx1, idx2, idx3, idx4;
987 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
988 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
990 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
991 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
993 retval[j++] = vowels[idx0];
994 retval[j++] = consonants[idx1];
995 retval[j++] = vowels[idx2];
996 if ((i + 1) < rounds) {
997 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
998 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
999 retval[j++] = consonants[idx3];
1001 retval[j++] = consonants[idx4];
1002 seed = ((seed * 5) +
1003 ((((u_int)(dgst_raw[2 * i])) * 7) +
1004 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1010 retval[j++] = vowels[idx0];
1011 retval[j++] = consonants[idx1];
1012 retval[j++] = vowels[idx2];
1021 * Draw an ASCII-Art representing the fingerprint so human brain can
1022 * profit from its built-in pattern recognition ability.
1023 * This technique is called "random art" and can be found in some
1024 * scientific publications like this original paper:
1026 * "Hash Visualization: a New Technique to improve Real-World Security",
1027 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
1028 * Techniques and E-Commerce (CrypTEC '99)
1029 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1031 * The subject came up in a talk by Dan Kaminsky, too.
1033 * If you see the picture is different, the key is different.
1034 * If the picture looks the same, you still know nothing.
1036 * The algorithm used here is a worm crawling over a discrete plane,
1037 * leaving a trace (augmenting the field) everywhere it goes.
1038 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1039 * makes the respective movement vector be ignored for this turn.
1040 * Graphs are not unambiguous, because circles in graphs can be
1041 * walked in either direction.
1045 * Field sizes for the random art. Have to be odd, so the starting point
1046 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1047 * Else pictures would be too dense, and drawing the frame would
1048 * fail, too, because the key type would not fit in anymore.
1051 #define FLDSIZE_Y (FLDBASE + 1)
1052 #define FLDSIZE_X (FLDBASE * 2 + 1)
1054 fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
1055 const struct sshkey *k)
1058 * Chars to be used after each other every time the worm
1059 * intersects with itself. Matter of taste.
1061 char *augmentation_string = " .o+=*BOX@%&#/^SE";
1062 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
1063 u_char field[FLDSIZE_X][FLDSIZE_Y];
1064 size_t i, tlen, hlen;
1067 size_t len = strlen(augmentation_string) - 1;
1069 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1072 /* initialize field */
1073 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1077 /* process raw key */
1078 for (i = 0; i < dgst_raw_len; i++) {
1080 /* each byte conveys four 2-bit move commands */
1081 input = dgst_raw[i];
1082 for (b = 0; b < 4; b++) {
1083 /* evaluate 2 bit, rest is shifted later */
1084 x += (input & 0x1) ? 1 : -1;
1085 y += (input & 0x2) ? 1 : -1;
1087 /* assure we are still in bounds */
1090 x = MIN(x, FLDSIZE_X - 1);
1091 y = MIN(y, FLDSIZE_Y - 1);
1093 /* augment the field */
1094 if (field[x][y] < len - 2)
1100 /* mark starting point and end point*/
1101 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1104 /* assemble title */
1105 r = snprintf(title, sizeof(title), "[%s %u]",
1106 sshkey_type(k), sshkey_size(k));
1107 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1108 if (r < 0 || r > (int)sizeof(title))
1109 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1110 tlen = (r <= 0) ? 0 : strlen(title);
1112 /* assemble hash ID. */
1113 r = snprintf(hash, sizeof(hash), "[%s]", alg);
1114 hlen = (r <= 0) ? 0 : strlen(hash);
1116 /* output upper border */
1119 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1121 memcpy(p, title, tlen);
1123 for (i += tlen; i < FLDSIZE_X; i++)
1128 /* output content */
1129 for (y = 0; y < FLDSIZE_Y; y++) {
1131 for (x = 0; x < FLDSIZE_X; x++)
1132 *p++ = augmentation_string[MIN(field[x][y], len)];
1137 /* output lower border */
1139 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
1141 memcpy(p, hash, hlen);
1143 for (i += hlen; i < FLDSIZE_X; i++)
1151 sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1152 enum sshkey_fp_rep dgst_rep)
1154 char *retval = NULL;
1156 size_t dgst_raw_len;
1158 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1161 case SSH_FP_DEFAULT:
1162 if (dgst_alg == SSH_DIGEST_MD5) {
1163 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1164 dgst_raw, dgst_raw_len);
1166 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1167 dgst_raw, dgst_raw_len);
1171 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1172 dgst_raw, dgst_raw_len);
1175 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1176 dgst_raw, dgst_raw_len);
1178 case SSH_FP_BUBBLEBABBLE:
1179 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1181 case SSH_FP_RANDOMART:
1182 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1183 dgst_raw, dgst_raw_len, k);
1186 explicit_bzero(dgst_raw, dgst_raw_len);
1190 explicit_bzero(dgst_raw, dgst_raw_len);
1197 * Reads a multiple-precision integer in decimal from the buffer, and advances
1198 * the pointer. The integer must already be initialized. This function is
1199 * permitted to modify the buffer. This leaves *cpp to point just beyond the
1200 * last processed character.
1203 read_decimal_bignum(char **cpp, BIGNUM *v)
1207 int skip = 1; /* skip white space */
1210 while (*cp == ' ' || *cp == '\t')
1212 e = strspn(cp, "0123456789");
1214 return SSH_ERR_INVALID_FORMAT;
1215 if (e > SSHBUF_MAX_BIGNUM * 3)
1216 return SSH_ERR_BIGNUM_TOO_LARGE;
1219 else if (index(" \t\r\n", cp[e]) == NULL)
1220 return SSH_ERR_INVALID_FORMAT;
1222 if (BN_dec2bn(&v, cp) <= 0)
1223 return SSH_ERR_INVALID_FORMAT;
1224 *cpp = cp + e + skip;
1227 #endif /* WITH_SSH1 */
1229 /* returns 0 ok, and < 0 error */
1231 sshkey_read(struct sshkey *ret, char **cpp)
1234 int retval = SSH_ERR_INVALID_FORMAT;
1236 int r, type, curve_nid = -1;
1237 struct sshbuf *blob;
1241 #endif /* WITH_SSH1 */
1245 switch (ret->type) {
1248 /* Get number of bits. */
1249 bits = strtoul(cp, &ep, 10);
1250 if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1251 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1252 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1253 /* Get public exponent, public modulus. */
1254 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1256 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1259 /* validate the claimed number of bits */
1260 if (BN_num_bits(ret->rsa->n) != (int)bits)
1261 return SSH_ERR_KEY_BITS_MISMATCH;
1263 #endif /* WITH_SSH1 */
1271 case KEY_ECDSA_CERT:
1273 case KEY_ED25519_CERT:
1274 space = strchr(cp, ' ');
1276 return SSH_ERR_INVALID_FORMAT;
1278 type = sshkey_type_from_name(cp);
1279 if (sshkey_type_plain(type) == KEY_ECDSA &&
1280 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1281 return SSH_ERR_EC_CURVE_INVALID;
1283 if (type == KEY_UNSPEC)
1284 return SSH_ERR_INVALID_FORMAT;
1287 return SSH_ERR_INVALID_FORMAT;
1288 if (ret->type != KEY_UNSPEC && ret->type != type)
1289 return SSH_ERR_KEY_TYPE_MISMATCH;
1290 if ((blob = sshbuf_new()) == NULL)
1291 return SSH_ERR_ALLOC_FAIL;
1293 space = strchr(cp, ' ');
1295 /* advance 'space': skip whitespace */
1297 while (*space == ' ' || *space == '\t')
1301 *cpp = cp + strlen(cp);
1302 if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1306 if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1307 sshbuf_len(blob), &k)) != 0) {
1312 if (k->type != type) {
1314 return SSH_ERR_KEY_TYPE_MISMATCH;
1316 if (sshkey_type_plain(type) == KEY_ECDSA &&
1317 curve_nid != k->ecdsa_nid) {
1319 return SSH_ERR_EC_CURVE_MISMATCH;
1322 if (sshkey_is_cert(ret)) {
1323 if (!sshkey_is_cert(k)) {
1325 return SSH_ERR_EXPECTED_CERT;
1327 if (ret->cert != NULL)
1328 cert_free(ret->cert);
1329 ret->cert = k->cert;
1333 if (sshkey_type_plain(ret->type) == KEY_RSA) {
1334 if (ret->rsa != NULL)
1339 RSA_print_fp(stderr, ret->rsa, 8);
1342 if (sshkey_type_plain(ret->type) == KEY_DSA) {
1343 if (ret->dsa != NULL)
1348 DSA_print_fp(stderr, ret->dsa, 8);
1351 # ifdef OPENSSL_HAS_ECC
1352 if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1353 if (ret->ecdsa != NULL)
1354 EC_KEY_free(ret->ecdsa);
1355 ret->ecdsa = k->ecdsa;
1356 ret->ecdsa_nid = k->ecdsa_nid;
1360 sshkey_dump_ec_key(ret->ecdsa);
1363 # endif /* OPENSSL_HAS_ECC */
1364 #endif /* WITH_OPENSSL */
1365 if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1366 free(ret->ed25519_pk);
1367 ret->ed25519_pk = k->ed25519_pk;
1368 k->ed25519_pk = NULL;
1380 return SSH_ERR_INVALID_ARGUMENT;
1386 sshkey_to_base64(const struct sshkey *key, char **b64p)
1388 int r = SSH_ERR_INTERNAL_ERROR;
1389 struct sshbuf *b = NULL;
1394 if ((b = sshbuf_new()) == NULL)
1395 return SSH_ERR_ALLOC_FAIL;
1396 if ((r = sshkey_putb(key, b)) != 0)
1398 if ((uu = sshbuf_dtob64(b)) == NULL) {
1399 r = SSH_ERR_ALLOC_FAIL;
1415 sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
1417 int r = SSH_ERR_INTERNAL_ERROR;
1420 char *dec_e = NULL, *dec_n = NULL;
1422 if (key->rsa == NULL || key->rsa->e == NULL ||
1423 key->rsa->n == NULL) {
1424 r = SSH_ERR_INVALID_ARGUMENT;
1427 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1428 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1429 r = SSH_ERR_ALLOC_FAIL;
1432 /* size of modulus 'n' */
1433 if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1434 r = SSH_ERR_INVALID_ARGUMENT;
1437 if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1444 OPENSSL_free(dec_e);
1446 OPENSSL_free(dec_n);
1447 #endif /* WITH_SSH1 */
1453 sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
1455 int r = SSH_ERR_INTERNAL_ERROR;
1458 if (key->type == KEY_RSA1) {
1459 if ((r = sshkey_format_rsa1(key, b)) != 0)
1462 /* Unsupported key types handled in sshkey_to_base64() */
1463 if ((r = sshkey_to_base64(key, &uu)) != 0)
1465 if ((r = sshbuf_putf(b, "%s %s",
1466 sshkey_ssh_name(key), uu)) != 0)
1476 sshkey_write(const struct sshkey *key, FILE *f)
1478 struct sshbuf *b = NULL;
1479 int r = SSH_ERR_INTERNAL_ERROR;
1481 if ((b = sshbuf_new()) == NULL)
1482 return SSH_ERR_ALLOC_FAIL;
1483 if ((r = sshkey_format_text(key, b)) != 0)
1485 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1488 r = SSH_ERR_SYSTEM_ERROR;
1499 sshkey_cert_type(const struct sshkey *k)
1501 switch (k->cert->type) {
1502 case SSH2_CERT_TYPE_USER:
1504 case SSH2_CERT_TYPE_HOST:
1513 rsa_generate_private_key(u_int bits, RSA **rsap)
1515 RSA *private = NULL;
1517 int ret = SSH_ERR_INTERNAL_ERROR;
1520 bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1521 bits > SSHBUF_MAX_BIGNUM * 8)
1522 return SSH_ERR_INVALID_ARGUMENT;
1524 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1525 ret = SSH_ERR_ALLOC_FAIL;
1528 if (!BN_set_word(f4, RSA_F4) ||
1529 !RSA_generate_key_ex(private, bits, f4, NULL)) {
1530 ret = SSH_ERR_LIBCRYPTO_ERROR;
1537 if (private != NULL)
1545 dsa_generate_private_key(u_int bits, DSA **dsap)
1548 int ret = SSH_ERR_INTERNAL_ERROR;
1550 if (dsap == NULL || bits != 1024)
1551 return SSH_ERR_INVALID_ARGUMENT;
1552 if ((private = DSA_new()) == NULL) {
1553 ret = SSH_ERR_ALLOC_FAIL;
1557 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1558 NULL, NULL) || !DSA_generate_key(private)) {
1559 ret = SSH_ERR_LIBCRYPTO_ERROR;
1566 if (private != NULL)
1571 # ifdef OPENSSL_HAS_ECC
1573 sshkey_ecdsa_key_to_nid(EC_KEY *k)
1577 NID_X9_62_prime256v1,
1579 # ifdef OPENSSL_HAS_NISTP521
1581 # endif /* OPENSSL_HAS_NISTP521 */
1587 const EC_GROUP *g = EC_KEY_get0_group(k);
1590 * The group may be stored in a ASN.1 encoded private key in one of two
1591 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1592 * or explicit group parameters encoded into the key blob. Only the
1593 * "named group" case sets the group NID for us, but we can figure
1594 * it out for the other case by comparing against all the groups that
1597 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1599 if ((bnctx = BN_CTX_new()) == NULL)
1601 for (i = 0; nids[i] != -1; i++) {
1602 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1606 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1611 if (nids[i] != -1) {
1612 /* Use the group with the NID attached */
1613 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1614 if (EC_KEY_set_group(k, eg) != 1) {
1623 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1626 int ret = SSH_ERR_INTERNAL_ERROR;
1628 if (nid == NULL || ecdsap == NULL ||
1629 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1630 return SSH_ERR_INVALID_ARGUMENT;
1632 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1633 ret = SSH_ERR_ALLOC_FAIL;
1636 if (EC_KEY_generate_key(private) != 1) {
1637 ret = SSH_ERR_LIBCRYPTO_ERROR;
1640 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1645 if (private != NULL)
1646 EC_KEY_free(private);
1649 # endif /* OPENSSL_HAS_ECC */
1650 #endif /* WITH_OPENSSL */
1653 sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1656 int ret = SSH_ERR_INTERNAL_ERROR;
1659 return SSH_ERR_INVALID_ARGUMENT;
1661 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1662 return SSH_ERR_ALLOC_FAIL;
1665 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1666 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1667 ret = SSH_ERR_ALLOC_FAIL;
1670 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1675 ret = dsa_generate_private_key(bits, &k->dsa);
1677 # ifdef OPENSSL_HAS_ECC
1679 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1682 # endif /* OPENSSL_HAS_ECC */
1685 ret = rsa_generate_private_key(bits, &k->rsa);
1687 #endif /* WITH_OPENSSL */
1689 ret = SSH_ERR_INVALID_ARGUMENT;
1700 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1703 const struct sshkey_cert *from;
1704 struct sshkey_cert *to;
1705 int ret = SSH_ERR_INTERNAL_ERROR;
1707 if (to_key->cert != NULL) {
1708 cert_free(to_key->cert);
1709 to_key->cert = NULL;
1712 if ((from = from_key->cert) == NULL)
1713 return SSH_ERR_INVALID_ARGUMENT;
1715 if ((to = to_key->cert = cert_new()) == NULL)
1716 return SSH_ERR_ALLOC_FAIL;
1718 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1719 (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1720 (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1723 to->serial = from->serial;
1724 to->type = from->type;
1725 if (from->key_id == NULL)
1727 else if ((to->key_id = strdup(from->key_id)) == NULL)
1728 return SSH_ERR_ALLOC_FAIL;
1729 to->valid_after = from->valid_after;
1730 to->valid_before = from->valid_before;
1731 if (from->signature_key == NULL)
1732 to->signature_key = NULL;
1733 else if ((ret = sshkey_from_private(from->signature_key,
1734 &to->signature_key)) != 0)
1737 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1738 return SSH_ERR_INVALID_ARGUMENT;
1739 if (from->nprincipals > 0) {
1740 if ((to->principals = calloc(from->nprincipals,
1741 sizeof(*to->principals))) == NULL)
1742 return SSH_ERR_ALLOC_FAIL;
1743 for (i = 0; i < from->nprincipals; i++) {
1744 to->principals[i] = strdup(from->principals[i]);
1745 if (to->principals[i] == NULL) {
1746 to->nprincipals = i;
1747 return SSH_ERR_ALLOC_FAIL;
1751 to->nprincipals = from->nprincipals;
1756 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1758 struct sshkey *n = NULL;
1759 int ret = SSH_ERR_INTERNAL_ERROR;
1768 if ((n = sshkey_new(k->type)) == NULL)
1769 return SSH_ERR_ALLOC_FAIL;
1770 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1771 (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1772 (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1773 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1775 return SSH_ERR_ALLOC_FAIL;
1778 # ifdef OPENSSL_HAS_ECC
1780 case KEY_ECDSA_CERT:
1781 if ((n = sshkey_new(k->type)) == NULL)
1782 return SSH_ERR_ALLOC_FAIL;
1783 n->ecdsa_nid = k->ecdsa_nid;
1784 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1785 if (n->ecdsa == NULL) {
1787 return SSH_ERR_ALLOC_FAIL;
1789 if (EC_KEY_set_public_key(n->ecdsa,
1790 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1792 return SSH_ERR_LIBCRYPTO_ERROR;
1795 # endif /* OPENSSL_HAS_ECC */
1799 if ((n = sshkey_new(k->type)) == NULL)
1800 return SSH_ERR_ALLOC_FAIL;
1801 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1802 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1804 return SSH_ERR_ALLOC_FAIL;
1807 #endif /* WITH_OPENSSL */
1809 case KEY_ED25519_CERT:
1810 if ((n = sshkey_new(k->type)) == NULL)
1811 return SSH_ERR_ALLOC_FAIL;
1812 if (k->ed25519_pk != NULL) {
1813 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1815 return SSH_ERR_ALLOC_FAIL;
1817 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1821 return SSH_ERR_KEY_TYPE_UNKNOWN;
1823 if (sshkey_is_cert(k)) {
1824 if ((ret = sshkey_cert_copy(k, n)) != 0) {
1834 cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
1836 struct sshbuf *principals = NULL, *crit = NULL;
1837 struct sshbuf *exts = NULL, *ca = NULL;
1839 size_t signed_len = 0, slen = 0, kidlen = 0;
1840 int ret = SSH_ERR_INTERNAL_ERROR;
1842 /* Copy the entire key blob for verification and later serialisation */
1843 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1846 /* Parse body of certificate up to signature */
1847 if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
1848 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1849 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1850 (ret = sshbuf_froms(b, &principals)) != 0 ||
1851 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1852 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1853 (ret = sshbuf_froms(b, &crit)) != 0 ||
1854 (ret = sshbuf_froms(b, &exts)) != 0 ||
1855 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1856 (ret = sshbuf_froms(b, &ca)) != 0) {
1857 /* XXX debug print error for ret */
1858 ret = SSH_ERR_INVALID_FORMAT;
1862 /* Signature is left in the buffer so we can calculate this length */
1863 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1865 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1866 ret = SSH_ERR_INVALID_FORMAT;
1870 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1871 key->cert->type != SSH2_CERT_TYPE_HOST) {
1872 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1876 /* Parse principals section */
1877 while (sshbuf_len(principals) > 0) {
1878 char *principal = NULL;
1879 char **oprincipals = NULL;
1881 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1882 ret = SSH_ERR_INVALID_FORMAT;
1885 if ((ret = sshbuf_get_cstring(principals, &principal,
1887 ret = SSH_ERR_INVALID_FORMAT;
1890 oprincipals = key->cert->principals;
1891 key->cert->principals = reallocarray(key->cert->principals,
1892 key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1893 if (key->cert->principals == NULL) {
1895 key->cert->principals = oprincipals;
1896 ret = SSH_ERR_ALLOC_FAIL;
1899 key->cert->principals[key->cert->nprincipals++] = principal;
1903 * Stash a copies of the critical options and extensions sections
1906 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
1908 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1912 * Validate critical options and extensions sections format.
1914 while (sshbuf_len(crit) != 0) {
1915 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
1916 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
1917 sshbuf_reset(key->cert->critical);
1918 ret = SSH_ERR_INVALID_FORMAT;
1922 while (exts != NULL && sshbuf_len(exts) != 0) {
1923 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
1924 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
1925 sshbuf_reset(key->cert->extensions);
1926 ret = SSH_ERR_INVALID_FORMAT;
1931 /* Parse CA key and check signature */
1932 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1933 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1936 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1937 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1940 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1941 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1950 sshbuf_free(principals);
1956 sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
1959 int type, ret = SSH_ERR_INTERNAL_ERROR;
1960 char *ktype = NULL, *curve = NULL;
1961 struct sshkey *key = NULL;
1964 struct sshbuf *copy;
1965 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
1967 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
1969 #ifdef DEBUG_PK /* XXX */
1970 sshbuf_dump(b, stderr);
1973 if ((copy = sshbuf_fromb(b)) == NULL) {
1974 ret = SSH_ERR_ALLOC_FAIL;
1977 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1978 ret = SSH_ERR_INVALID_FORMAT;
1982 type = sshkey_type_from_name(ktype);
1983 if (!allow_cert && sshkey_type_is_cert(type)) {
1984 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1991 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1992 ret = SSH_ERR_INVALID_FORMAT;
1997 if ((key = sshkey_new(type)) == NULL) {
1998 ret = SSH_ERR_ALLOC_FAIL;
2001 if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
2002 sshbuf_get_bignum2(b, key->rsa->n) != 0) {
2003 ret = SSH_ERR_INVALID_FORMAT;
2007 RSA_print_fp(stderr, key->rsa, 8);
2012 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2013 ret = SSH_ERR_INVALID_FORMAT;
2018 if ((key = sshkey_new(type)) == NULL) {
2019 ret = SSH_ERR_ALLOC_FAIL;
2022 if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
2023 sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
2024 sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
2025 sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
2026 ret = SSH_ERR_INVALID_FORMAT;
2030 DSA_print_fp(stderr, key->dsa, 8);
2033 case KEY_ECDSA_CERT:
2035 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2036 ret = SSH_ERR_INVALID_FORMAT;
2040 # ifdef OPENSSL_HAS_ECC
2042 if ((key = sshkey_new(type)) == NULL) {
2043 ret = SSH_ERR_ALLOC_FAIL;
2046 key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
2047 if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
2048 ret = SSH_ERR_INVALID_FORMAT;
2051 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2052 ret = SSH_ERR_EC_CURVE_MISMATCH;
2055 if (key->ecdsa != NULL)
2056 EC_KEY_free(key->ecdsa);
2057 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2059 ret = SSH_ERR_EC_CURVE_INVALID;
2062 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2063 ret = SSH_ERR_ALLOC_FAIL;
2066 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2067 ret = SSH_ERR_INVALID_FORMAT;
2070 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2072 ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2075 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2076 /* XXX assume it is a allocation error */
2077 ret = SSH_ERR_ALLOC_FAIL;
2081 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2084 # endif /* OPENSSL_HAS_ECC */
2085 #endif /* WITH_OPENSSL */
2086 case KEY_ED25519_CERT:
2088 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2089 ret = SSH_ERR_INVALID_FORMAT;
2094 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2096 if (len != ED25519_PK_SZ) {
2097 ret = SSH_ERR_INVALID_FORMAT;
2100 if ((key = sshkey_new(type)) == NULL) {
2101 ret = SSH_ERR_ALLOC_FAIL;
2104 key->ed25519_pk = pk;
2108 if ((key = sshkey_new(type)) == NULL) {
2109 ret = SSH_ERR_ALLOC_FAIL;
2114 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2118 /* Parse certificate potion */
2119 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
2122 if (key != NULL && sshbuf_len(b) != 0) {
2123 ret = SSH_ERR_INVALID_FORMAT;
2135 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2138 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2143 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2148 if ((b = sshbuf_from(blob, blen)) == NULL)
2149 return SSH_ERR_ALLOC_FAIL;
2150 r = sshkey_from_blob_internal(b, keyp, 1);
2156 sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
2158 return sshkey_from_blob_internal(b, keyp, 1);
2162 sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
2167 if ((r = sshbuf_froms(buf, &b)) != 0)
2169 r = sshkey_from_blob_internal(b, keyp, 1);
2175 sshkey_sign(const struct sshkey *key,
2176 u_char **sigp, size_t *lenp,
2177 const u_char *data, size_t datalen, u_int compat)
2183 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2184 return SSH_ERR_INVALID_ARGUMENT;
2185 switch (key->type) {
2189 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2190 # ifdef OPENSSL_HAS_ECC
2191 case KEY_ECDSA_CERT:
2193 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2194 # endif /* OPENSSL_HAS_ECC */
2197 return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2198 #endif /* WITH_OPENSSL */
2200 case KEY_ED25519_CERT:
2201 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2203 return SSH_ERR_KEY_TYPE_UNKNOWN;
2208 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2211 sshkey_verify(const struct sshkey *key,
2212 const u_char *sig, size_t siglen,
2213 const u_char *data, size_t dlen, u_int compat)
2215 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2216 return SSH_ERR_INVALID_ARGUMENT;
2217 switch (key->type) {
2221 return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2222 # ifdef OPENSSL_HAS_ECC
2223 case KEY_ECDSA_CERT:
2225 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2226 # endif /* OPENSSL_HAS_ECC */
2229 return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2230 #endif /* WITH_OPENSSL */
2232 case KEY_ED25519_CERT:
2233 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2235 return SSH_ERR_KEY_TYPE_UNKNOWN;
2239 /* Converts a private to a public key */
2241 sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2244 int ret = SSH_ERR_INTERNAL_ERROR;
2249 if ((pk = calloc(1, sizeof(*pk))) == NULL)
2250 return SSH_ERR_ALLOC_FAIL;
2252 pk->flags = k->flags;
2253 pk->ecdsa_nid = k->ecdsa_nid;
2257 pk->ed25519_pk = NULL;
2258 pk->ed25519_sk = NULL;
2263 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2268 if ((pk->rsa = RSA_new()) == NULL ||
2269 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2270 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2271 ret = SSH_ERR_ALLOC_FAIL;
2276 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2280 if ((pk->dsa = DSA_new()) == NULL ||
2281 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2282 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2283 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2284 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2285 ret = SSH_ERR_ALLOC_FAIL;
2289 case KEY_ECDSA_CERT:
2290 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2293 # ifdef OPENSSL_HAS_ECC
2295 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2296 if (pk->ecdsa == NULL) {
2297 ret = SSH_ERR_ALLOC_FAIL;
2300 if (EC_KEY_set_public_key(pk->ecdsa,
2301 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2302 ret = SSH_ERR_LIBCRYPTO_ERROR;
2306 # endif /* OPENSSL_HAS_ECC */
2307 #endif /* WITH_OPENSSL */
2308 case KEY_ED25519_CERT:
2309 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2313 if (k->ed25519_pk != NULL) {
2314 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2315 ret = SSH_ERR_ALLOC_FAIL;
2318 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2322 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2331 /* Convert a plain key to their _CERT equivalent */
2333 sshkey_to_certified(struct sshkey *k)
2340 newtype = KEY_RSA_CERT;
2343 newtype = KEY_DSA_CERT;
2346 newtype = KEY_ECDSA_CERT;
2348 #endif /* WITH_OPENSSL */
2350 newtype = KEY_ED25519_CERT;
2353 return SSH_ERR_INVALID_ARGUMENT;
2355 if ((k->cert = cert_new()) == NULL)
2356 return SSH_ERR_ALLOC_FAIL;
2361 /* Convert a certificate to its raw key equivalent */
2363 sshkey_drop_cert(struct sshkey *k)
2365 if (!sshkey_type_is_cert(k->type))
2366 return SSH_ERR_KEY_TYPE_UNKNOWN;
2369 k->type = sshkey_type_plain(k->type);
2373 /* Sign a certified key, (re-)generating the signed certblob. */
2375 sshkey_certify(struct sshkey *k, struct sshkey *ca)
2377 struct sshbuf *principals = NULL;
2378 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2379 size_t i, ca_len, sig_len;
2380 int ret = SSH_ERR_INTERNAL_ERROR;
2381 struct sshbuf *cert;
2383 if (k == NULL || k->cert == NULL ||
2384 k->cert->certblob == NULL || ca == NULL)
2385 return SSH_ERR_INVALID_ARGUMENT;
2386 if (!sshkey_is_cert(k))
2387 return SSH_ERR_KEY_TYPE_UNKNOWN;
2388 if (!sshkey_type_is_valid_ca(ca->type))
2389 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2391 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2392 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2394 cert = k->cert->certblob; /* for readability */
2396 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2399 /* -v01 certs put nonce first */
2400 arc4random_buf(&nonce, sizeof(nonce));
2401 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2404 /* XXX this substantially duplicates to_blob(); refactor */
2408 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2409 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2410 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2411 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2414 # ifdef OPENSSL_HAS_ECC
2415 case KEY_ECDSA_CERT:
2416 if ((ret = sshbuf_put_cstring(cert,
2417 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2418 (ret = sshbuf_put_ec(cert,
2419 EC_KEY_get0_public_key(k->ecdsa),
2420 EC_KEY_get0_group(k->ecdsa))) != 0)
2423 # endif /* OPENSSL_HAS_ECC */
2425 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2426 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2429 #endif /* WITH_OPENSSL */
2430 case KEY_ED25519_CERT:
2431 if ((ret = sshbuf_put_string(cert,
2432 k->ed25519_pk, ED25519_PK_SZ)) != 0)
2436 ret = SSH_ERR_INVALID_ARGUMENT;
2440 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
2441 (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2442 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2445 if ((principals = sshbuf_new()) == NULL) {
2446 ret = SSH_ERR_ALLOC_FAIL;
2449 for (i = 0; i < k->cert->nprincipals; i++) {
2450 if ((ret = sshbuf_put_cstring(principals,
2451 k->cert->principals[i])) != 0)
2454 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2455 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2456 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2457 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
2458 (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
2459 (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2460 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2463 /* Sign the whole mess */
2464 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2465 sshbuf_len(cert), 0)) != 0)
2468 /* Append signature and we are done */
2469 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2475 if (sig_blob != NULL)
2477 if (ca_blob != NULL)
2479 if (principals != NULL)
2480 sshbuf_free(principals);
2485 sshkey_cert_check_authority(const struct sshkey *k,
2486 int want_host, int require_principal,
2487 const char *name, const char **reason)
2489 u_int i, principal_matches;
2490 time_t now = time(NULL);
2496 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2497 *reason = "Certificate invalid: not a host certificate";
2498 return SSH_ERR_KEY_CERT_INVALID;
2501 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2502 *reason = "Certificate invalid: not a user certificate";
2503 return SSH_ERR_KEY_CERT_INVALID;
2507 /* yikes - system clock before epoch! */
2508 *reason = "Certificate invalid: not yet valid";
2509 return SSH_ERR_KEY_CERT_INVALID;
2511 if ((u_int64_t)now < k->cert->valid_after) {
2512 *reason = "Certificate invalid: not yet valid";
2513 return SSH_ERR_KEY_CERT_INVALID;
2515 if ((u_int64_t)now >= k->cert->valid_before) {
2516 *reason = "Certificate invalid: expired";
2517 return SSH_ERR_KEY_CERT_INVALID;
2519 if (k->cert->nprincipals == 0) {
2520 if (require_principal) {
2521 *reason = "Certificate lacks principal list";
2522 return SSH_ERR_KEY_CERT_INVALID;
2524 } else if (name != NULL) {
2525 principal_matches = 0;
2526 for (i = 0; i < k->cert->nprincipals; i++) {
2527 if (strcmp(name, k->cert->principals[i]) == 0) {
2528 principal_matches = 1;
2532 if (!principal_matches) {
2533 *reason = "Certificate invalid: name is not a listed "
2535 return SSH_ERR_KEY_CERT_INVALID;
2542 sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2544 int r = SSH_ERR_INTERNAL_ERROR;
2546 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2548 switch (key->type) {
2551 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2552 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2553 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2554 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2555 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2556 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2560 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2561 r = SSH_ERR_INVALID_ARGUMENT;
2564 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2565 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2566 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2567 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2568 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2572 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2573 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2574 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2575 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2576 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2580 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2581 r = SSH_ERR_INVALID_ARGUMENT;
2584 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2585 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2588 # ifdef OPENSSL_HAS_ECC
2590 if ((r = sshbuf_put_cstring(b,
2591 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2592 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2593 (r = sshbuf_put_bignum2(b,
2594 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2597 case KEY_ECDSA_CERT:
2598 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2599 r = SSH_ERR_INVALID_ARGUMENT;
2602 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2603 (r = sshbuf_put_bignum2(b,
2604 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2607 # endif /* OPENSSL_HAS_ECC */
2608 #endif /* WITH_OPENSSL */
2610 if ((r = sshbuf_put_string(b, key->ed25519_pk,
2611 ED25519_PK_SZ)) != 0 ||
2612 (r = sshbuf_put_string(b, key->ed25519_sk,
2613 ED25519_SK_SZ)) != 0)
2616 case KEY_ED25519_CERT:
2617 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2618 r = SSH_ERR_INVALID_ARGUMENT;
2621 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2622 (r = sshbuf_put_string(b, key->ed25519_pk,
2623 ED25519_PK_SZ)) != 0 ||
2624 (r = sshbuf_put_string(b, key->ed25519_sk,
2625 ED25519_SK_SZ)) != 0)
2629 r = SSH_ERR_INVALID_ARGUMENT;
2639 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2641 char *tname = NULL, *curve = NULL;
2642 struct sshkey *k = NULL;
2643 size_t pklen = 0, sklen = 0;
2644 int type, r = SSH_ERR_INTERNAL_ERROR;
2645 u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2647 BIGNUM *exponent = NULL;
2648 #endif /* WITH_OPENSSL */
2652 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2654 type = sshkey_type_from_name(tname);
2658 if ((k = sshkey_new_private(type)) == NULL) {
2659 r = SSH_ERR_ALLOC_FAIL;
2662 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2663 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2664 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2665 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2666 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2670 if ((r = sshkey_froms(buf, &k)) != 0 ||
2671 (r = sshkey_add_private(k)) != 0 ||
2672 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2675 # ifdef OPENSSL_HAS_ECC
2677 if ((k = sshkey_new_private(type)) == NULL) {
2678 r = SSH_ERR_ALLOC_FAIL;
2681 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2682 r = SSH_ERR_INVALID_ARGUMENT;
2685 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2687 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2688 r = SSH_ERR_EC_CURVE_MISMATCH;
2691 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2692 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2693 r = SSH_ERR_LIBCRYPTO_ERROR;
2696 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2697 (r = sshbuf_get_bignum2(buf, exponent)))
2699 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2700 r = SSH_ERR_LIBCRYPTO_ERROR;
2703 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2704 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2705 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2708 case KEY_ECDSA_CERT:
2709 if ((exponent = BN_new()) == NULL) {
2710 r = SSH_ERR_LIBCRYPTO_ERROR;
2713 if ((r = sshkey_froms(buf, &k)) != 0 ||
2714 (r = sshkey_add_private(k)) != 0 ||
2715 (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2717 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2718 r = SSH_ERR_LIBCRYPTO_ERROR;
2721 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2722 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2723 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2726 # endif /* OPENSSL_HAS_ECC */
2728 if ((k = sshkey_new_private(type)) == NULL) {
2729 r = SSH_ERR_ALLOC_FAIL;
2732 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2733 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2734 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2735 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2736 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2737 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2738 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2742 if ((r = sshkey_froms(buf, &k)) != 0 ||
2743 (r = sshkey_add_private(k)) != 0 ||
2744 (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2745 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2746 (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2747 (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2748 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2751 #endif /* WITH_OPENSSL */
2753 if ((k = sshkey_new_private(type)) == NULL) {
2754 r = SSH_ERR_ALLOC_FAIL;
2757 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2758 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2760 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2761 r = SSH_ERR_INVALID_FORMAT;
2764 k->ed25519_pk = ed25519_pk;
2765 k->ed25519_sk = ed25519_sk;
2766 ed25519_pk = ed25519_sk = NULL;
2768 case KEY_ED25519_CERT:
2769 if ((r = sshkey_froms(buf, &k)) != 0 ||
2770 (r = sshkey_add_private(k)) != 0 ||
2771 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2772 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2774 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2775 r = SSH_ERR_INVALID_FORMAT;
2778 k->ed25519_pk = ed25519_pk;
2779 k->ed25519_sk = ed25519_sk;
2780 ed25519_pk = ed25519_sk = NULL;
2783 r = SSH_ERR_KEY_TYPE_UNKNOWN;
2787 /* enable blinding */
2792 if (RSA_blinding_on(k->rsa, NULL) != 1) {
2793 r = SSH_ERR_LIBCRYPTO_ERROR;
2798 #endif /* WITH_OPENSSL */
2809 if (exponent != NULL)
2810 BN_clear_free(exponent);
2811 #endif /* WITH_OPENSSL */
2813 if (ed25519_pk != NULL) {
2814 explicit_bzero(ed25519_pk, pklen);
2817 if (ed25519_sk != NULL) {
2818 explicit_bzero(ed25519_sk, sklen);
2824 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2826 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2829 EC_POINT *nq = NULL;
2830 BIGNUM *order, *x, *y, *tmp;
2831 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2833 if ((bnctx = BN_CTX_new()) == NULL)
2834 return SSH_ERR_ALLOC_FAIL;
2835 BN_CTX_start(bnctx);
2838 * We shouldn't ever hit this case because bignum_get_ecpoint()
2839 * refuses to load GF2m points.
2841 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2842 NID_X9_62_prime_field)
2846 if (EC_POINT_is_at_infinity(group, public))
2849 if ((x = BN_CTX_get(bnctx)) == NULL ||
2850 (y = BN_CTX_get(bnctx)) == NULL ||
2851 (order = BN_CTX_get(bnctx)) == NULL ||
2852 (tmp = BN_CTX_get(bnctx)) == NULL) {
2853 ret = SSH_ERR_ALLOC_FAIL;
2857 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2858 if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2859 EC_POINT_get_affine_coordinates_GFp(group, public,
2860 x, y, bnctx) != 1) {
2861 ret = SSH_ERR_LIBCRYPTO_ERROR;
2864 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2865 BN_num_bits(y) <= BN_num_bits(order) / 2)
2868 /* nQ == infinity (n == order of subgroup) */
2869 if ((nq = EC_POINT_new(group)) == NULL) {
2870 ret = SSH_ERR_ALLOC_FAIL;
2873 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2874 ret = SSH_ERR_LIBCRYPTO_ERROR;
2877 if (EC_POINT_is_at_infinity(group, nq) != 1)
2880 /* x < order - 1, y < order - 1 */
2881 if (!BN_sub(tmp, order, BN_value_one())) {
2882 ret = SSH_ERR_LIBCRYPTO_ERROR;
2885 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2896 sshkey_ec_validate_private(const EC_KEY *key)
2899 BIGNUM *order, *tmp;
2900 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2902 if ((bnctx = BN_CTX_new()) == NULL)
2903 return SSH_ERR_ALLOC_FAIL;
2904 BN_CTX_start(bnctx);
2906 if ((order = BN_CTX_get(bnctx)) == NULL ||
2907 (tmp = BN_CTX_get(bnctx)) == NULL) {
2908 ret = SSH_ERR_ALLOC_FAIL;
2912 /* log2(private) > log2(order)/2 */
2913 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2914 ret = SSH_ERR_LIBCRYPTO_ERROR;
2917 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2918 BN_num_bits(order) / 2)
2921 /* private < order - 1 */
2922 if (!BN_sub(tmp, order, BN_value_one())) {
2923 ret = SSH_ERR_LIBCRYPTO_ERROR;
2926 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2935 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2940 if (point == NULL) {
2941 fputs("point=(NULL)\n", stderr);
2944 if ((bnctx = BN_CTX_new()) == NULL) {
2945 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2948 BN_CTX_start(bnctx);
2949 if ((x = BN_CTX_get(bnctx)) == NULL ||
2950 (y = BN_CTX_get(bnctx)) == NULL) {
2951 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2954 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2955 NID_X9_62_prime_field) {
2956 fprintf(stderr, "%s: group is not a prime field\n", __func__);
2959 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2961 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2965 fputs("x=", stderr);
2966 BN_print_fp(stderr, x);
2967 fputs("\ny=", stderr);
2968 BN_print_fp(stderr, y);
2969 fputs("\n", stderr);
2974 sshkey_dump_ec_key(const EC_KEY *key)
2976 const BIGNUM *exponent;
2978 sshkey_dump_ec_point(EC_KEY_get0_group(key),
2979 EC_KEY_get0_public_key(key));
2980 fputs("exponent=", stderr);
2981 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2982 fputs("(NULL)", stderr);
2984 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2985 fputs("\n", stderr);
2987 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2990 sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2991 const char *passphrase, const char *comment, const char *ciphername,
2994 u_char *cp, *key = NULL, *pubkeyblob = NULL;
2995 u_char salt[SALT_LEN];
2997 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2999 int r = SSH_ERR_INTERNAL_ERROR;
3000 struct sshcipher_ctx ciphercontext;
3001 const struct sshcipher *cipher;
3002 const char *kdfname = KDFNAME;
3003 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
3005 memset(&ciphercontext, 0, sizeof(ciphercontext));
3008 rounds = DEFAULT_ROUNDS;
3009 if (passphrase == NULL || !strlen(passphrase)) {
3010 ciphername = "none";
3012 } else if (ciphername == NULL)
3013 ciphername = DEFAULT_CIPHERNAME;
3014 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
3015 r = SSH_ERR_INVALID_ARGUMENT;
3018 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3019 r = SSH_ERR_INTERNAL_ERROR;
3023 if ((kdf = sshbuf_new()) == NULL ||
3024 (encoded = sshbuf_new()) == NULL ||
3025 (encrypted = sshbuf_new()) == NULL) {
3026 r = SSH_ERR_ALLOC_FAIL;
3029 blocksize = cipher_blocksize(cipher);
3030 keylen = cipher_keylen(cipher);
3031 ivlen = cipher_ivlen(cipher);
3032 authlen = cipher_authlen(cipher);
3033 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3034 r = SSH_ERR_ALLOC_FAIL;
3037 if (strcmp(kdfname, "bcrypt") == 0) {
3038 arc4random_buf(salt, SALT_LEN);
3039 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3040 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3041 r = SSH_ERR_INVALID_ARGUMENT;
3044 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3045 (r = sshbuf_put_u32(kdf, rounds)) != 0)
3047 } else if (strcmp(kdfname, "none") != 0) {
3048 /* Unsupported KDF type */
3049 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3052 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3053 key + keylen, ivlen, 1)) != 0)
3056 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3057 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3058 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3059 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3060 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3061 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3062 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3065 /* set up the buffer that will be encrypted */
3067 /* Random check bytes */
3068 check = arc4random();
3069 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3070 (r = sshbuf_put_u32(encrypted, check)) != 0)
3073 /* append private key and comment*/
3074 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3075 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3080 while (sshbuf_len(encrypted) % blocksize) {
3081 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3085 /* length in destination buffer */
3086 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3090 if ((r = sshbuf_reserve(encoded,
3091 sshbuf_len(encrypted) + authlen, &cp)) != 0)
3093 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3094 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3098 if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3099 r = SSH_ERR_ALLOC_FAIL;
3104 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3106 for (i = 0; i < strlen(b64); i++) {
3107 if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3109 /* insert line breaks */
3110 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3113 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3115 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3123 sshbuf_free(encoded);
3124 sshbuf_free(encrypted);
3125 cipher_cleanup(&ciphercontext);
3126 explicit_bzero(salt, sizeof(salt));
3128 explicit_bzero(key, keylen + ivlen);
3131 if (pubkeyblob != NULL) {
3132 explicit_bzero(pubkeyblob, pubkeylen);
3136 explicit_bzero(b64, strlen(b64));
3143 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3144 struct sshkey **keyp, char **commentp)
3146 char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3147 const struct sshcipher *cipher = NULL;
3149 int r = SSH_ERR_INTERNAL_ERROR;
3151 size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
3152 struct sshbuf *encoded = NULL, *decoded = NULL;
3153 struct sshbuf *kdf = NULL, *decrypted = NULL;
3154 struct sshcipher_ctx ciphercontext;
3155 struct sshkey *k = NULL;
3156 u_char *key = NULL, *salt = NULL, *dp, pad, last;
3157 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3159 memset(&ciphercontext, 0, sizeof(ciphercontext));
3162 if (commentp != NULL)
3165 if ((encoded = sshbuf_new()) == NULL ||
3166 (decoded = sshbuf_new()) == NULL ||
3167 (decrypted = sshbuf_new()) == NULL) {
3168 r = SSH_ERR_ALLOC_FAIL;
3172 /* check preamble */
3173 cp = sshbuf_ptr(blob);
3174 encoded_len = sshbuf_len(blob);
3175 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3176 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3177 r = SSH_ERR_INVALID_FORMAT;
3180 cp += MARK_BEGIN_LEN;
3181 encoded_len -= MARK_BEGIN_LEN;
3183 /* Look for end marker, removing whitespace as we go */
3184 while (encoded_len > 0) {
3185 if (*cp != '\n' && *cp != '\r') {
3186 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3193 if (encoded_len >= MARK_END_LEN &&
3194 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3196 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3202 if (encoded_len == 0) {
3203 r = SSH_ERR_INVALID_FORMAT;
3208 if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
3212 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3213 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3214 r = SSH_ERR_INVALID_FORMAT;
3217 /* parse public portion of key */
3218 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3219 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3220 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3221 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3222 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3223 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3224 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3227 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3228 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3231 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3232 strcmp(ciphername, "none") != 0) {
3233 /* passphrase required */
3234 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3237 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3238 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3241 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3242 r = SSH_ERR_INVALID_FORMAT;
3246 /* XXX only one key supported */
3247 r = SSH_ERR_INVALID_FORMAT;
3251 /* check size of encrypted key blob */
3252 blocksize = cipher_blocksize(cipher);
3253 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3254 r = SSH_ERR_INVALID_FORMAT;
3259 keylen = cipher_keylen(cipher);
3260 ivlen = cipher_ivlen(cipher);
3261 authlen = cipher_authlen(cipher);
3262 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3263 r = SSH_ERR_ALLOC_FAIL;
3266 if (strcmp(kdfname, "bcrypt") == 0) {
3267 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3268 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3270 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3271 key, keylen + ivlen, rounds) < 0) {
3272 r = SSH_ERR_INVALID_FORMAT;
3277 /* check that an appropriate amount of auth data is present */
3278 if (sshbuf_len(decoded) < encrypted_len + authlen) {
3279 r = SSH_ERR_INVALID_FORMAT;
3283 /* decrypt private portion of key */
3284 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3285 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3286 key + keylen, ivlen, 0)) != 0)
3288 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3289 encrypted_len, 0, authlen)) != 0) {
3290 /* an integrity error here indicates an incorrect passphrase */
3291 if (r == SSH_ERR_MAC_INVALID)
3292 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3295 if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
3297 /* there should be no trailing data */
3298 if (sshbuf_len(decoded) != 0) {
3299 r = SSH_ERR_INVALID_FORMAT;
3303 /* check check bytes */
3304 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3305 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3307 if (check1 != check2) {
3308 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3312 /* Load the private key and comment */
3313 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3314 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3317 /* Check deterministic padding */
3319 while (sshbuf_len(decrypted)) {
3320 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3322 if (pad != (++i & 0xff)) {
3323 r = SSH_ERR_INVALID_FORMAT;
3328 /* XXX decode pubkey and check against private */
3336 if (commentp != NULL) {
3337 *commentp = comment;
3342 cipher_cleanup(&ciphercontext);
3347 explicit_bzero(salt, slen);
3351 explicit_bzero(key, keylen + ivlen);
3354 sshbuf_free(encoded);
3355 sshbuf_free(decoded);
3357 sshbuf_free(decrypted);
3364 * Serialises the authentication (private) key to a blob, encrypting it with
3365 * passphrase. The identification of the blob (lowest 64 bits of n) will
3366 * precede the key to provide identification of the key without needing a
3370 sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3371 const char *passphrase, const char *comment)
3373 struct sshbuf *buffer = NULL, *encrypted = NULL;
3376 struct sshcipher_ctx ciphercontext;
3377 const struct sshcipher *cipher;
3381 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3382 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3384 cipher_num = (strcmp(passphrase, "") == 0) ?
3385 SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3386 if ((cipher = cipher_by_number(cipher_num)) == NULL)
3387 return SSH_ERR_INTERNAL_ERROR;
3389 /* This buffer is used to build the secret part of the private key. */
3390 if ((buffer = sshbuf_new()) == NULL)
3391 return SSH_ERR_ALLOC_FAIL;
3393 /* Put checkbytes for checking passphrase validity. */
3394 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3396 arc4random_buf(cp, 2);
3397 memcpy(cp + 2, cp, 2);
3400 * Store the private key (n and e will not be stored because they
3401 * will be stored in plain text, and storing them also in encrypted
3402 * format would just give known plaintext).
3403 * Note: q and p are stored in reverse order to SSL.
3405 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3406 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3407 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3408 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3411 /* Pad the part to be encrypted to a size that is a multiple of 8. */
3412 explicit_bzero(buf, 8);
3413 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3416 /* This buffer will be used to contain the data in the file. */
3417 if ((encrypted = sshbuf_new()) == NULL) {
3418 r = SSH_ERR_ALLOC_FAIL;
3422 /* First store keyfile id string. */
3423 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3424 sizeof(LEGACY_BEGIN))) != 0)
3427 /* Store cipher type and "reserved" field. */
3428 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3429 (r = sshbuf_put_u32(encrypted, 0)) != 0)
3432 /* Store public key. This will be in plain text. */
3433 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3434 (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3435 (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3436 (r = sshbuf_put_cstring(encrypted, comment) != 0))
3439 /* Allocate space for the private part of the key in the buffer. */
3440 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3443 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3444 CIPHER_ENCRYPT)) != 0)
3446 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3447 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3449 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3452 r = sshbuf_putb(blob, encrypted);
3455 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3456 explicit_bzero(buf, sizeof(buf));
3458 sshbuf_free(buffer);
3459 if (encrypted != NULL)
3460 sshbuf_free(encrypted);
3464 #endif /* WITH_SSH1 */
3467 /* convert SSH v2 key in OpenSSL PEM format */
3469 sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3470 const char *_passphrase, const char *comment)
3473 int blen, len = strlen(_passphrase);
3474 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3475 #if (OPENSSL_VERSION_NUMBER < 0x00907000L)
3476 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
3478 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3483 if (len > 0 && len <= 4)
3484 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3485 if ((bio = BIO_new(BIO_s_mem())) == NULL)
3486 return SSH_ERR_ALLOC_FAIL;
3488 switch (key->type) {
3490 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3491 cipher, passphrase, len, NULL, NULL);
3493 #ifdef OPENSSL_HAS_ECC
3495 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3496 cipher, passphrase, len, NULL, NULL);
3500 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3501 cipher, passphrase, len, NULL, NULL);
3508 r = SSH_ERR_LIBCRYPTO_ERROR;
3511 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3512 r = SSH_ERR_INTERNAL_ERROR;
3515 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3522 #endif /* WITH_OPENSSL */
3524 /* Serialise "key" to buffer "blob" */
3526 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3527 const char *passphrase, const char *comment,
3528 int force_new_format, const char *new_format_cipher, int new_format_rounds)
3530 switch (key->type) {
3533 return sshkey_private_rsa1_to_blob(key, blob,
3534 passphrase, comment);
3535 #endif /* WITH_SSH1 */
3540 if (force_new_format) {
3541 return sshkey_private_to_blob2(key, blob, passphrase,
3542 comment, new_format_cipher, new_format_rounds);
3544 return sshkey_private_pem_to_blob(key, blob,
3545 passphrase, comment);
3546 #endif /* WITH_OPENSSL */
3548 return sshkey_private_to_blob2(key, blob, passphrase,
3549 comment, new_format_cipher, new_format_rounds);
3551 return SSH_ERR_KEY_TYPE_UNKNOWN;
3557 * Parse the public, unencrypted portion of a RSA1 key.
3560 sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3561 struct sshkey **keyp, char **commentp)
3564 struct sshkey *pub = NULL;
3565 struct sshbuf *copy = NULL;
3569 if (commentp != NULL)
3572 /* Check that it is at least big enough to contain the ID string. */
3573 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3574 return SSH_ERR_INVALID_FORMAT;
3577 * Make sure it begins with the id string. Consume the id string
3580 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3581 return SSH_ERR_INVALID_FORMAT;
3582 /* Make a working copy of the keyblob and skip past the magic */
3583 if ((copy = sshbuf_fromb(blob)) == NULL)
3584 return SSH_ERR_ALLOC_FAIL;
3585 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3588 /* Skip cipher type, reserved data and key bits. */
3589 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3590 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3591 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3594 /* Read the public key from the buffer. */
3595 if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3596 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3597 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3600 /* Finally, the comment */
3601 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3604 /* The encrypted private part is not parsed by this function. */
3622 sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3623 struct sshkey **keyp, char **commentp)
3626 u_int16_t check1, check2;
3627 u_int8_t cipher_type;
3628 struct sshbuf *decrypted = NULL, *copy = NULL;
3630 char *comment = NULL;
3631 struct sshcipher_ctx ciphercontext;
3632 const struct sshcipher *cipher;
3633 struct sshkey *prv = NULL;
3636 if (commentp != NULL)
3639 /* Check that it is at least big enough to contain the ID string. */
3640 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3641 return SSH_ERR_INVALID_FORMAT;
3644 * Make sure it begins with the id string. Consume the id string
3647 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3648 return SSH_ERR_INVALID_FORMAT;
3650 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3651 r = SSH_ERR_ALLOC_FAIL;
3654 if ((copy = sshbuf_fromb(blob)) == NULL ||
3655 (decrypted = sshbuf_new()) == NULL) {
3656 r = SSH_ERR_ALLOC_FAIL;
3659 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3662 /* Read cipher type. */
3663 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3664 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3667 /* Read the public key and comment from the buffer. */
3668 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3669 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3670 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3671 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3674 /* Check that it is a supported cipher. */
3675 cipher = cipher_by_number(cipher_type);
3676 if (cipher == NULL) {
3677 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3680 /* Initialize space for decrypted data. */
3681 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3684 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3685 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3686 CIPHER_DECRYPT)) != 0)
3688 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3689 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3690 cipher_cleanup(&ciphercontext);
3693 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3696 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3697 (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3699 if (check1 != check2) {
3700 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3704 /* Read the rest of the private key. */
3705 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3706 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3707 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3708 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3711 /* calculate p-1 and q-1 */
3712 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3715 /* enable blinding */
3716 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3717 r = SSH_ERR_LIBCRYPTO_ERROR;
3723 if (commentp != NULL) {
3724 *commentp = comment;
3728 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3729 if (comment != NULL)
3735 if (decrypted != NULL)
3736 sshbuf_free(decrypted);
3739 #endif /* WITH_SSH1 */
3743 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3744 const char *passphrase, struct sshkey **keyp)
3746 EVP_PKEY *pk = NULL;
3747 struct sshkey *prv = NULL;
3753 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3754 return SSH_ERR_ALLOC_FAIL;
3755 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3756 (int)sshbuf_len(blob)) {
3757 r = SSH_ERR_ALLOC_FAIL;
3761 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3762 (char *)passphrase)) == NULL) {
3763 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3766 if (pk->type == EVP_PKEY_RSA &&
3767 (type == KEY_UNSPEC || type == KEY_RSA)) {
3768 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3769 r = SSH_ERR_ALLOC_FAIL;
3772 prv->rsa = EVP_PKEY_get1_RSA(pk);
3773 prv->type = KEY_RSA;
3775 RSA_print_fp(stderr, prv->rsa, 8);
3777 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3778 r = SSH_ERR_LIBCRYPTO_ERROR;
3781 } else if (pk->type == EVP_PKEY_DSA &&
3782 (type == KEY_UNSPEC || type == KEY_DSA)) {
3783 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3784 r = SSH_ERR_ALLOC_FAIL;
3787 prv->dsa = EVP_PKEY_get1_DSA(pk);
3788 prv->type = KEY_DSA;
3790 DSA_print_fp(stderr, prv->dsa, 8);
3792 #ifdef OPENSSL_HAS_ECC
3793 } else if (pk->type == EVP_PKEY_EC &&
3794 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3795 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3796 r = SSH_ERR_ALLOC_FAIL;
3799 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3800 prv->type = KEY_ECDSA;
3801 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3802 if (prv->ecdsa_nid == -1 ||
3803 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3804 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3805 EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3806 sshkey_ec_validate_private(prv->ecdsa) != 0) {
3807 r = SSH_ERR_INVALID_FORMAT;
3811 if (prv != NULL && prv->ecdsa != NULL)
3812 sshkey_dump_ec_key(prv->ecdsa);
3814 #endif /* OPENSSL_HAS_ECC */
3816 r = SSH_ERR_INVALID_FORMAT;
3830 #endif /* WITH_OPENSSL */
3833 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3834 const char *passphrase, struct sshkey **keyp, char **commentp)
3839 if (commentp != NULL)
3845 return sshkey_parse_private_rsa1(blob, passphrase,
3847 #endif /* WITH_SSH1 */
3852 return sshkey_parse_private_pem_fileblob(blob, type,
3854 #endif /* WITH_OPENSSL */
3856 return sshkey_parse_private2(blob, type, passphrase,
3859 if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3863 return sshkey_parse_private_pem_fileblob(blob, type,
3866 return SSH_ERR_INVALID_FORMAT;
3867 #endif /* WITH_OPENSSL */
3869 return SSH_ERR_KEY_TYPE_UNKNOWN;
3874 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3875 const char *filename, struct sshkey **keyp, char **commentp)
3881 if (commentp != NULL)
3885 /* it's a SSH v1 key if the public key part is readable */
3886 if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3887 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3888 passphrase, keyp, commentp);
3890 #endif /* WITH_SSH1 */
3891 if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3892 passphrase, keyp, commentp)) == 0)