1 /* $OpenBSD: sshkey.c,v 1.3 2014/07/03 01:45:38 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>
31 #include <sys/types.h>
33 #include <openssl/evp.h>
34 #include <openssl/err.h>
35 #include <openssl/pem.h>
37 #include "crypto_api.h"
44 #endif /* HAVE_UTIL_H */
53 #define SSHKEY_INTERNAL
56 /* openssh private key file format */
57 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
58 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
59 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
60 #define MARK_END_LEN (sizeof(MARK_END) - 1)
61 #define KDFNAME "bcrypt"
62 #define AUTH_MAGIC "openssh-key-v1"
64 #define DEFAULT_CIPHERNAME "aes256-cbc"
65 #define DEFAULT_ROUNDS 16
67 /* Version identification string for SSH v1 identity files. */
68 #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
70 static int sshkey_from_blob_internal(const u_char *blob, size_t blen,
71 struct sshkey **keyp, int allow_cert);
73 /* Supported key types */
76 const char *shortname;
81 static const struct keytype keytypes[] = {
82 { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
83 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
84 KEY_ED25519_CERT, 0, 1 },
86 { NULL, "RSA1", KEY_RSA1, 0, 0 },
87 { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
88 { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
89 # ifdef OPENSSL_HAS_ECC
90 { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
91 { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
92 # ifdef OPENSSL_HAS_NISTP521
93 { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
94 # endif /* OPENSSL_HAS_NISTP521 */
95 # endif /* OPENSSL_HAS_ECC */
96 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
97 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
98 # ifdef OPENSSL_HAS_ECC
99 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
100 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
101 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
102 KEY_ECDSA_CERT, NID_secp384r1, 1 },
103 # ifdef OPENSSL_HAS_NISTP521
104 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
105 KEY_ECDSA_CERT, NID_secp521r1, 1 },
106 # endif /* OPENSSL_HAS_NISTP521 */
107 # endif /* OPENSSL_HAS_ECC */
108 { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
109 KEY_RSA_CERT_V00, 0, 1 },
110 { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
111 KEY_DSA_CERT_V00, 0, 1 },
112 #endif /* WITH_OPENSSL */
113 { NULL, NULL, -1, -1, 0 }
117 sshkey_type(const struct sshkey *k)
119 const struct keytype *kt;
121 for (kt = keytypes; kt->type != -1; kt++) {
122 if (kt->type == k->type)
123 return kt->shortname;
129 sshkey_ssh_name_from_type_nid(int type, int nid)
131 const struct keytype *kt;
133 for (kt = keytypes; kt->type != -1; kt++) {
134 if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
137 return "ssh-unknown";
141 sshkey_type_is_cert(int type)
143 const struct keytype *kt;
145 for (kt = keytypes; kt->type != -1; kt++) {
146 if (kt->type == type)
153 sshkey_ssh_name(const struct sshkey *k)
155 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
159 sshkey_ssh_name_plain(const struct sshkey *k)
161 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
166 sshkey_type_from_name(const char *name)
168 const struct keytype *kt;
170 for (kt = keytypes; kt->type != -1; kt++) {
171 /* Only allow shortname matches for plain key types */
172 if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
173 (!kt->cert && strcasecmp(kt->shortname, name) == 0))
180 sshkey_ecdsa_nid_from_name(const char *name)
182 const struct keytype *kt;
184 for (kt = keytypes; kt->type != -1; kt++) {
185 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
187 if (kt->name != NULL && strcmp(name, kt->name) == 0)
194 key_alg_list(int certs_only, int plain_only)
196 char *tmp, *ret = NULL;
197 size_t nlen, rlen = 0;
198 const struct keytype *kt;
200 for (kt = keytypes; kt->type != -1; kt++) {
201 if (kt->name == NULL)
203 if ((certs_only && !kt->cert) || (plain_only && kt->cert))
207 nlen = strlen(kt->name);
208 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
213 memcpy(ret + rlen, kt->name, nlen + 1);
220 sshkey_names_valid2(const char *names)
224 if (names == NULL || strcmp(names, "") == 0)
226 if ((s = cp = strdup(names)) == NULL)
228 for ((p = strsep(&cp, ",")); p && *p != '\0';
229 (p = strsep(&cp, ","))) {
230 switch (sshkey_type_from_name(p)) {
242 sshkey_size(const struct sshkey *k)
248 case KEY_RSA_CERT_V00:
250 return BN_num_bits(k->rsa->n);
252 case KEY_DSA_CERT_V00:
254 return BN_num_bits(k->dsa->p);
257 return sshkey_curve_nid_to_bits(k->ecdsa_nid);
258 #endif /* WITH_OPENSSL */
260 case KEY_ED25519_CERT:
261 return 256; /* XXX */
267 sshkey_cert_is_legacy(const struct sshkey *k)
270 case KEY_DSA_CERT_V00:
271 case KEY_RSA_CERT_V00:
279 sshkey_type_is_valid_ca(int type)
293 sshkey_is_cert(const struct sshkey *k)
297 return sshkey_type_is_cert(k->type);
300 /* Return the cert-less equivalent to a certified key type */
302 sshkey_type_plain(int type)
305 case KEY_RSA_CERT_V00:
308 case KEY_DSA_CERT_V00:
313 case KEY_ED25519_CERT:
321 /* XXX: these are really begging for a table-driven approach */
323 sshkey_curve_name_to_nid(const char *name)
325 if (strcmp(name, "nistp256") == 0)
326 return NID_X9_62_prime256v1;
327 else if (strcmp(name, "nistp384") == 0)
328 return NID_secp384r1;
329 # ifdef OPENSSL_HAS_NISTP521
330 else if (strcmp(name, "nistp521") == 0)
331 return NID_secp521r1;
332 # endif /* OPENSSL_HAS_NISTP521 */
338 sshkey_curve_nid_to_bits(int nid)
341 case NID_X9_62_prime256v1:
345 # ifdef OPENSSL_HAS_NISTP521
348 # endif /* OPENSSL_HAS_NISTP521 */
355 sshkey_ecdsa_bits_to_nid(int bits)
359 return NID_X9_62_prime256v1;
361 return NID_secp384r1;
362 # ifdef OPENSSL_HAS_NISTP521
364 return NID_secp521r1;
365 # endif /* OPENSSL_HAS_NISTP521 */
372 sshkey_curve_nid_to_name(int nid)
375 case NID_X9_62_prime256v1:
379 # ifdef OPENSSL_HAS_NISTP521
382 # endif /* OPENSSL_HAS_NISTP521 */
389 sshkey_ec_nid_to_hash_alg(int nid)
391 int kbits = sshkey_curve_nid_to_bits(nid);
396 /* RFC5656 section 6.2.1 */
398 return SSH_DIGEST_SHA256;
399 else if (kbits <= 384)
400 return SSH_DIGEST_SHA384;
402 return SSH_DIGEST_SHA512;
404 #endif /* WITH_OPENSSL */
407 cert_free(struct sshkey_cert *cert)
413 if (cert->certblob != NULL)
414 sshbuf_free(cert->certblob);
415 if (cert->critical != NULL)
416 sshbuf_free(cert->critical);
417 if (cert->extensions != NULL)
418 sshbuf_free(cert->extensions);
419 if (cert->key_id != NULL)
421 for (i = 0; i < cert->nprincipals; i++)
422 free(cert->principals[i]);
423 if (cert->principals != NULL)
424 free(cert->principals);
425 if (cert->signature_key != NULL)
426 sshkey_free(cert->signature_key);
427 explicit_bzero(cert, sizeof(*cert));
431 static struct sshkey_cert *
434 struct sshkey_cert *cert;
436 if ((cert = calloc(1, sizeof(*cert))) == NULL)
438 if ((cert->certblob = sshbuf_new()) == NULL ||
439 (cert->critical = sshbuf_new()) == NULL ||
440 (cert->extensions = sshbuf_new()) == NULL) {
445 cert->principals = NULL;
446 cert->signature_key = NULL;
457 #endif /* WITH_OPENSSL */
459 if ((k = calloc(1, sizeof(*k))) == NULL)
467 k->ed25519_sk = NULL;
468 k->ed25519_pk = NULL;
473 case KEY_RSA_CERT_V00:
475 if ((rsa = RSA_new()) == NULL ||
476 (rsa->n = BN_new()) == NULL ||
477 (rsa->e = BN_new()) == NULL) {
486 case KEY_DSA_CERT_V00:
488 if ((dsa = DSA_new()) == NULL ||
489 (dsa->p = BN_new()) == NULL ||
490 (dsa->q = BN_new()) == NULL ||
491 (dsa->g = BN_new()) == NULL ||
492 (dsa->pub_key = BN_new()) == NULL) {
502 /* Cannot do anything until we know the group */
504 #endif /* WITH_OPENSSL */
506 case KEY_ED25519_CERT:
507 /* no need to prealloc */
517 if (sshkey_is_cert(k)) {
518 if ((k->cert = cert_new()) == NULL) {
528 sshkey_add_private(struct sshkey *k)
534 case KEY_RSA_CERT_V00:
536 #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
537 if (bn_maybe_alloc_failed(k->rsa->d) ||
538 bn_maybe_alloc_failed(k->rsa->iqmp) ||
539 bn_maybe_alloc_failed(k->rsa->q) ||
540 bn_maybe_alloc_failed(k->rsa->p) ||
541 bn_maybe_alloc_failed(k->rsa->dmq1) ||
542 bn_maybe_alloc_failed(k->rsa->dmp1))
543 return SSH_ERR_ALLOC_FAIL;
546 case KEY_DSA_CERT_V00:
548 if (bn_maybe_alloc_failed(k->dsa->priv_key))
549 return SSH_ERR_ALLOC_FAIL;
551 #undef bn_maybe_alloc_failed
554 /* Cannot do anything until we know the group */
556 #endif /* WITH_OPENSSL */
558 case KEY_ED25519_CERT:
559 /* no need to prealloc */
564 return SSH_ERR_INVALID_ARGUMENT;
570 sshkey_new_private(int type)
572 struct sshkey *k = sshkey_new(type);
576 if (sshkey_add_private(k) != 0) {
584 sshkey_free(struct sshkey *k)
592 case KEY_RSA_CERT_V00:
599 case KEY_DSA_CERT_V00:
605 # ifdef OPENSSL_HAS_ECC
608 if (k->ecdsa != NULL)
609 EC_KEY_free(k->ecdsa);
612 # endif /* OPENSSL_HAS_ECC */
613 #endif /* WITH_OPENSSL */
615 case KEY_ED25519_CERT:
617 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
619 k->ed25519_pk = NULL;
622 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
624 k->ed25519_sk = NULL;
632 if (sshkey_is_cert(k))
634 explicit_bzero(k, sizeof(*k));
639 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
641 if (a == NULL && b == NULL)
643 if (a == NULL || b == NULL)
645 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
647 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
648 sshbuf_len(a->certblob)) != 0)
654 * Compare public portions of key only, allowing comparisons between
655 * certificates and plain keys too.
658 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
660 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
662 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
664 if (a == NULL || b == NULL ||
665 sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
671 case KEY_RSA_CERT_V00:
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;
677 case KEY_DSA_CERT_V00:
680 return a->dsa != NULL && b->dsa != NULL &&
681 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
682 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
683 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
684 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
685 # ifdef OPENSSL_HAS_ECC
688 if (a->ecdsa == NULL || b->ecdsa == NULL ||
689 EC_KEY_get0_public_key(a->ecdsa) == NULL ||
690 EC_KEY_get0_public_key(b->ecdsa) == NULL)
692 if ((bnctx = BN_CTX_new()) == NULL)
694 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
695 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
696 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
697 EC_KEY_get0_public_key(a->ecdsa),
698 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
704 # endif /* OPENSSL_HAS_ECC */
705 #endif /* WITH_OPENSSL */
707 case KEY_ED25519_CERT:
708 return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
709 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
717 sshkey_equal(const struct sshkey *a, const struct sshkey *b)
719 if (a == NULL || b == NULL || a->type != b->type)
721 if (sshkey_is_cert(a)) {
722 if (!cert_compare(a->cert, b->cert))
725 return sshkey_equal_public(a, b);
729 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
731 int type, ret = SSH_ERR_INTERNAL_ERROR;
732 const char *typename;
735 return SSH_ERR_INVALID_ARGUMENT;
737 type = force_plain ? sshkey_type_plain(key->type) : key->type;
738 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
742 case KEY_DSA_CERT_V00:
743 case KEY_RSA_CERT_V00:
747 #endif /* WITH_OPENSSL */
748 case KEY_ED25519_CERT:
749 /* Use the existing blob */
750 /* XXX modified flag? */
751 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
756 if (key->dsa == NULL)
757 return SSH_ERR_INVALID_ARGUMENT;
758 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
759 (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
760 (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
761 (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
762 (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
765 # ifdef OPENSSL_HAS_ECC
767 if (key->ecdsa == NULL)
768 return SSH_ERR_INVALID_ARGUMENT;
769 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
770 (ret = sshbuf_put_cstring(b,
771 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
772 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
777 if (key->rsa == NULL)
778 return SSH_ERR_INVALID_ARGUMENT;
779 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
780 (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
781 (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
784 #endif /* WITH_OPENSSL */
786 if (key->ed25519_pk == NULL)
787 return SSH_ERR_INVALID_ARGUMENT;
788 if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
789 (ret = sshbuf_put_string(b,
790 key->ed25519_pk, ED25519_PK_SZ)) != 0)
794 return SSH_ERR_KEY_TYPE_UNKNOWN;
800 sshkey_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
802 return to_blob_buf(key, b, 0);
806 sshkey_plain_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
808 return to_blob_buf(key, b, 1);
812 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
814 int ret = SSH_ERR_INTERNAL_ERROR;
816 struct sshbuf *b = NULL;
822 if ((b = sshbuf_new()) == NULL)
823 return SSH_ERR_ALLOC_FAIL;
824 if ((ret = to_blob_buf(key, b, force_plain)) != 0)
830 if ((*blobp = malloc(len)) == NULL) {
831 ret = SSH_ERR_ALLOC_FAIL;
834 memcpy(*blobp, sshbuf_ptr(b), len);
843 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
845 return to_blob(key, blobp, lenp, 0);
849 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
851 return to_blob(key, blobp, lenp, 1);
855 sshkey_fingerprint_raw(const struct sshkey *k, enum sshkey_fp_type dgst_type,
856 u_char **retp, size_t *lenp)
858 u_char *blob = NULL, *ret = NULL;
860 int hash_alg = -1, r = SSH_ERR_INTERNAL_ERROR;
869 hash_alg = SSH_DIGEST_MD5;
872 hash_alg = SSH_DIGEST_SHA1;
875 hash_alg = SSH_DIGEST_SHA256;
878 r = SSH_ERR_INVALID_ARGUMENT;
882 if (k->type == KEY_RSA1) {
884 int nlen = BN_num_bytes(k->rsa->n);
885 int elen = BN_num_bytes(k->rsa->e);
887 blob_len = nlen + elen;
888 if (nlen >= INT_MAX - elen ||
889 (blob = malloc(blob_len)) == NULL) {
890 r = SSH_ERR_ALLOC_FAIL;
893 BN_bn2bin(k->rsa->n, blob);
894 BN_bn2bin(k->rsa->e, blob + nlen);
895 #endif /* WITH_OPENSSL */
896 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0)
898 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
899 r = SSH_ERR_ALLOC_FAIL;
902 if ((r = ssh_digest_memory(hash_alg, blob, blob_len,
903 ret, SSH_DIGEST_MAX_LENGTH)) != 0)
911 *lenp = ssh_digest_bytes(hash_alg);
916 explicit_bzero(blob, blob_len);
923 fingerprint_hex(u_char *dgst_raw, size_t dgst_raw_len)
928 if ((retval = calloc(1, dgst_raw_len * 3 + 1)) == NULL)
930 for (i = 0; i < dgst_raw_len; i++) {
932 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
933 strlcat(retval, hex, dgst_raw_len * 3 + 1);
936 /* Remove the trailing ':' character */
937 retval[(dgst_raw_len * 3) - 1] = '\0';
942 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
944 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
945 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
946 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
947 u_int i, j = 0, rounds, seed = 1;
950 rounds = (dgst_raw_len / 2) + 1;
951 if ((retval = calloc(rounds, 6)) == NULL)
954 for (i = 0; i < rounds; i++) {
955 u_int idx0, idx1, idx2, idx3, idx4;
956 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
957 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
959 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
960 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
962 retval[j++] = vowels[idx0];
963 retval[j++] = consonants[idx1];
964 retval[j++] = vowels[idx2];
965 if ((i + 1) < rounds) {
966 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
967 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
968 retval[j++] = consonants[idx3];
970 retval[j++] = consonants[idx4];
972 ((((u_int)(dgst_raw[2 * i])) * 7) +
973 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
979 retval[j++] = vowels[idx0];
980 retval[j++] = consonants[idx1];
981 retval[j++] = vowels[idx2];
990 * Draw an ASCII-Art representing the fingerprint so human brain can
991 * profit from its built-in pattern recognition ability.
992 * This technique is called "random art" and can be found in some
993 * scientific publications like this original paper:
995 * "Hash Visualization: a New Technique to improve Real-World Security",
996 * Perrig A. and Song D., 1999, International Workshop on Cryptographic
997 * Techniques and E-Commerce (CrypTEC '99)
998 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
1000 * The subject came up in a talk by Dan Kaminsky, too.
1002 * If you see the picture is different, the key is different.
1003 * If the picture looks the same, you still know nothing.
1005 * The algorithm used here is a worm crawling over a discrete plane,
1006 * leaving a trace (augmenting the field) everywhere it goes.
1007 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
1008 * makes the respective movement vector be ignored for this turn.
1009 * Graphs are not unambiguous, because circles in graphs can be
1010 * walked in either direction.
1014 * Field sizes for the random art. Have to be odd, so the starting point
1015 * can be in the exact middle of the picture, and FLDBASE should be >=8 .
1016 * Else pictures would be too dense, and drawing the frame would
1017 * fail, too, because the key type would not fit in anymore.
1020 #define FLDSIZE_Y (FLDBASE + 1)
1021 #define FLDSIZE_X (FLDBASE * 2 + 1)
1023 fingerprint_randomart(u_char *dgst_raw, size_t dgst_raw_len,
1024 const struct sshkey *k)
1027 * Chars to be used after each other every time the worm
1028 * intersects with itself. Matter of taste.
1030 char *augmentation_string = " .o+=*BOX@%&#/^SE";
1031 char *retval, *p, title[FLDSIZE_X];
1032 u_char field[FLDSIZE_X][FLDSIZE_Y];
1036 size_t len = strlen(augmentation_string) - 1;
1038 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
1041 /* initialize field */
1042 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1046 /* process raw key */
1047 for (i = 0; i < dgst_raw_len; i++) {
1049 /* each byte conveys four 2-bit move commands */
1050 input = dgst_raw[i];
1051 for (b = 0; b < 4; b++) {
1052 /* evaluate 2 bit, rest is shifted later */
1053 x += (input & 0x1) ? 1 : -1;
1054 y += (input & 0x2) ? 1 : -1;
1056 /* assure we are still in bounds */
1059 x = MIN(x, FLDSIZE_X - 1);
1060 y = MIN(y, FLDSIZE_Y - 1);
1062 /* augment the field */
1063 if (field[x][y] < len - 2)
1069 /* mark starting point and end point*/
1070 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
1073 /* assemble title */
1074 r = snprintf(title, sizeof(title), "[%s %u]",
1075 sshkey_type(k), sshkey_size(k));
1076 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1077 if (r < 0 || r > (int)sizeof(title))
1078 snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1079 tlen = strlen(title);
1081 /* output upper border */
1084 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
1086 memcpy(p, title, tlen);
1088 for (i = p - retval - 1; i < FLDSIZE_X; i++)
1093 /* output content */
1094 for (y = 0; y < FLDSIZE_Y; y++) {
1096 for (x = 0; x < FLDSIZE_X; x++)
1097 *p++ = augmentation_string[MIN(field[x][y], len)];
1102 /* output lower border */
1104 for (i = 0; i < FLDSIZE_X; i++)
1112 sshkey_fingerprint(const struct sshkey *k, enum sshkey_fp_type dgst_type,
1113 enum sshkey_fp_rep dgst_rep)
1115 char *retval = NULL;
1117 size_t dgst_raw_len;
1119 if (sshkey_fingerprint_raw(k, dgst_type, &dgst_raw, &dgst_raw_len) != 0)
1123 retval = fingerprint_hex(dgst_raw, dgst_raw_len);
1125 case SSH_FP_BUBBLEBABBLE:
1126 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1128 case SSH_FP_RANDOMART:
1129 retval = fingerprint_randomart(dgst_raw, dgst_raw_len, k);
1132 explicit_bzero(dgst_raw, dgst_raw_len);
1136 explicit_bzero(dgst_raw, dgst_raw_len);
1143 * Reads a multiple-precision integer in decimal from the buffer, and advances
1144 * the pointer. The integer must already be initialized. This function is
1145 * permitted to modify the buffer. This leaves *cpp to point just beyond the
1146 * last processed character.
1149 read_decimal_bignum(char **cpp, BIGNUM *v)
1153 int skip = 1; /* skip white space */
1156 while (*cp == ' ' || *cp == '\t')
1158 e = strspn(cp, "0123456789");
1160 return SSH_ERR_INVALID_FORMAT;
1161 if (e > SSHBUF_MAX_BIGNUM * 3)
1162 return SSH_ERR_BIGNUM_TOO_LARGE;
1165 else if (index(" \t\r\n", cp[e]) == NULL)
1166 return SSH_ERR_INVALID_FORMAT;
1168 if (BN_dec2bn(&v, cp) <= 0)
1169 return SSH_ERR_INVALID_FORMAT;
1170 *cpp = cp + e + skip;
1173 #endif /* WITH_SSH1 */
1175 /* returns 0 ok, and < 0 error */
1177 sshkey_read(struct sshkey *ret, char **cpp)
1180 int retval = SSH_ERR_INVALID_FORMAT;
1182 int r, type, curve_nid = -1;
1183 struct sshbuf *blob;
1187 #endif /* WITH_SSH1 */
1191 switch (ret->type) {
1194 /* Get number of bits. */
1195 bits = strtoul(cp, &ep, 10);
1196 if (*cp == '\0' || index(" \t\r\n", *ep) == NULL ||
1197 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
1198 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
1199 /* Get public exponent, public modulus. */
1200 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
1202 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
1205 /* validate the claimed number of bits */
1206 if (BN_num_bits(ret->rsa->n) != (int)bits)
1207 return SSH_ERR_KEY_BITS_MISMATCH;
1209 #endif /* WITH_SSH1 */
1216 case KEY_DSA_CERT_V00:
1217 case KEY_RSA_CERT_V00:
1219 case KEY_ECDSA_CERT:
1221 case KEY_ED25519_CERT:
1222 space = strchr(cp, ' ');
1224 return SSH_ERR_INVALID_FORMAT;
1226 type = sshkey_type_from_name(cp);
1227 if (sshkey_type_plain(type) == KEY_ECDSA &&
1228 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
1229 return SSH_ERR_EC_CURVE_INVALID;
1231 if (type == KEY_UNSPEC)
1232 return SSH_ERR_INVALID_FORMAT;
1235 return SSH_ERR_INVALID_FORMAT;
1236 if (ret->type == KEY_UNSPEC) {
1238 } else if (ret->type != type)
1239 return SSH_ERR_KEY_TYPE_MISMATCH;
1240 if ((blob = sshbuf_new()) == NULL)
1241 return SSH_ERR_ALLOC_FAIL;
1243 space = strchr(cp, ' ');
1246 if ((r = sshbuf_b64tod(blob, cp)) != 0) {
1250 if ((r = sshkey_from_blob(sshbuf_ptr(blob),
1251 sshbuf_len(blob), &k)) != 0) {
1256 if (k->type != type) {
1258 return SSH_ERR_KEY_TYPE_MISMATCH;
1260 if (sshkey_type_plain(type) == KEY_ECDSA &&
1261 curve_nid != k->ecdsa_nid) {
1263 return SSH_ERR_EC_CURVE_MISMATCH;
1266 if (sshkey_is_cert(ret)) {
1267 if (!sshkey_is_cert(k)) {
1269 return SSH_ERR_EXPECTED_CERT;
1271 if (ret->cert != NULL)
1272 cert_free(ret->cert);
1273 ret->cert = k->cert;
1277 if (sshkey_type_plain(ret->type) == KEY_RSA) {
1278 if (ret->rsa != NULL)
1283 RSA_print_fp(stderr, ret->rsa, 8);
1286 if (sshkey_type_plain(ret->type) == KEY_DSA) {
1287 if (ret->dsa != NULL)
1292 DSA_print_fp(stderr, ret->dsa, 8);
1295 # ifdef OPENSSL_HAS_ECC
1296 if (sshkey_type_plain(ret->type) == KEY_ECDSA) {
1297 if (ret->ecdsa != NULL)
1298 EC_KEY_free(ret->ecdsa);
1299 ret->ecdsa = k->ecdsa;
1300 ret->ecdsa_nid = k->ecdsa_nid;
1304 sshkey_dump_ec_key(ret->ecdsa);
1307 # endif /* OPENSSL_HAS_ECC */
1308 #endif /* WITH_OPENSSL */
1309 if (sshkey_type_plain(ret->type) == KEY_ED25519) {
1310 free(ret->ed25519_pk);
1311 ret->ed25519_pk = k->ed25519_pk;
1312 k->ed25519_pk = NULL;
1322 /* advance cp: skip whitespace and data */
1323 while (*cp == ' ' || *cp == '\t')
1325 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
1330 return SSH_ERR_INVALID_ARGUMENT;
1336 sshkey_write(const struct sshkey *key, FILE *f)
1338 int ret = SSH_ERR_INTERNAL_ERROR;
1339 struct sshbuf *b = NULL, *bb = NULL;
1343 char *dec_e = NULL, *dec_n = NULL;
1344 #endif /* WITH_SSH1 */
1346 if (sshkey_is_cert(key)) {
1347 if (key->cert == NULL)
1348 return SSH_ERR_EXPECTED_CERT;
1349 if (sshbuf_len(key->cert->certblob) == 0)
1350 return SSH_ERR_KEY_LACKS_CERTBLOB;
1352 if ((b = sshbuf_new()) == NULL)
1353 return SSH_ERR_ALLOC_FAIL;
1354 switch (key->type) {
1357 if (key->rsa == NULL || key->rsa->e == NULL ||
1358 key->rsa->n == NULL) {
1359 ret = SSH_ERR_INVALID_ARGUMENT;
1362 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
1363 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
1364 ret = SSH_ERR_ALLOC_FAIL;
1367 /* size of modulus 'n' */
1368 if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
1369 ret = SSH_ERR_INVALID_ARGUMENT;
1372 if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
1374 #endif /* WITH_SSH1 */
1378 case KEY_DSA_CERT_V00:
1381 case KEY_ECDSA_CERT:
1383 case KEY_RSA_CERT_V00:
1385 #endif /* WITH_OPENSSL */
1387 case KEY_ED25519_CERT:
1388 if ((bb = sshbuf_new()) == NULL) {
1389 ret = SSH_ERR_ALLOC_FAIL;
1392 if ((ret = sshkey_to_blob_buf(key, bb)) != 0)
1394 if ((uu = sshbuf_dtob64(bb)) == NULL) {
1395 ret = SSH_ERR_ALLOC_FAIL;
1398 if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
1400 if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
1404 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
1407 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1410 ret = SSH_ERR_SYSTEM_ERROR;
1423 OPENSSL_free(dec_e);
1425 OPENSSL_free(dec_n);
1426 #endif /* WITH_SSH1 */
1431 sshkey_cert_type(const struct sshkey *k)
1433 switch (k->cert->type) {
1434 case SSH2_CERT_TYPE_USER:
1436 case SSH2_CERT_TYPE_HOST:
1445 rsa_generate_private_key(u_int bits, RSA **rsap)
1447 RSA *private = NULL;
1449 int ret = SSH_ERR_INTERNAL_ERROR;
1452 bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
1453 bits > SSHBUF_MAX_BIGNUM * 8)
1454 return SSH_ERR_INVALID_ARGUMENT;
1456 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
1457 ret = SSH_ERR_ALLOC_FAIL;
1460 if (!BN_set_word(f4, RSA_F4) ||
1461 !RSA_generate_key_ex(private, bits, f4, NULL)) {
1462 ret = SSH_ERR_LIBCRYPTO_ERROR;
1469 if (private != NULL)
1477 dsa_generate_private_key(u_int bits, DSA **dsap)
1480 int ret = SSH_ERR_INTERNAL_ERROR;
1482 if (dsap == NULL || bits != 1024)
1483 return SSH_ERR_INVALID_ARGUMENT;
1484 if ((private = DSA_new()) == NULL) {
1485 ret = SSH_ERR_ALLOC_FAIL;
1489 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1490 NULL, NULL) || !DSA_generate_key(private)) {
1492 ret = SSH_ERR_LIBCRYPTO_ERROR;
1499 if (private != NULL)
1504 # ifdef OPENSSL_HAS_ECC
1506 sshkey_ecdsa_key_to_nid(EC_KEY *k)
1510 NID_X9_62_prime256v1,
1512 # ifdef OPENSSL_HAS_NISTP521
1514 # endif /* OPENSSL_HAS_NISTP521 */
1520 const EC_GROUP *g = EC_KEY_get0_group(k);
1523 * The group may be stored in a ASN.1 encoded private key in one of two
1524 * ways: as a "named group", which is reconstituted by ASN.1 object ID
1525 * or explicit group parameters encoded into the key blob. Only the
1526 * "named group" case sets the group NID for us, but we can figure
1527 * it out for the other case by comparing against all the groups that
1530 if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1532 if ((bnctx = BN_CTX_new()) == NULL)
1534 for (i = 0; nids[i] != -1; i++) {
1535 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
1539 if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1544 if (nids[i] != -1) {
1545 /* Use the group with the NID attached */
1546 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1547 if (EC_KEY_set_group(k, eg) != 1) {
1556 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
1559 int ret = SSH_ERR_INTERNAL_ERROR;
1561 if (nid == NULL || ecdsap == NULL ||
1562 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
1563 return SSH_ERR_INVALID_ARGUMENT;
1565 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
1566 ret = SSH_ERR_ALLOC_FAIL;
1569 if (EC_KEY_generate_key(private) != 1) {
1570 ret = SSH_ERR_LIBCRYPTO_ERROR;
1573 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1578 if (private != NULL)
1579 EC_KEY_free(private);
1582 # endif /* OPENSSL_HAS_ECC */
1583 #endif /* WITH_OPENSSL */
1586 sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1589 int ret = SSH_ERR_INTERNAL_ERROR;
1592 return SSH_ERR_INVALID_ARGUMENT;
1594 if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
1595 return SSH_ERR_ALLOC_FAIL;
1598 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
1599 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
1600 ret = SSH_ERR_ALLOC_FAIL;
1603 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1608 ret = dsa_generate_private_key(bits, &k->dsa);
1610 # ifdef OPENSSL_HAS_ECC
1612 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
1615 # endif /* OPENSSL_HAS_ECC */
1618 ret = rsa_generate_private_key(bits, &k->rsa);
1620 #endif /* WITH_OPENSSL */
1622 ret = SSH_ERR_INVALID_ARGUMENT;
1633 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
1636 const struct sshkey_cert *from;
1637 struct sshkey_cert *to;
1638 int ret = SSH_ERR_INTERNAL_ERROR;
1640 if (to_key->cert != NULL) {
1641 cert_free(to_key->cert);
1642 to_key->cert = NULL;
1645 if ((from = from_key->cert) == NULL)
1646 return SSH_ERR_INVALID_ARGUMENT;
1648 if ((to = to_key->cert = cert_new()) == NULL)
1649 return SSH_ERR_ALLOC_FAIL;
1651 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
1652 (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
1653 (ret = sshbuf_putb(to->extensions, from->extensions) != 0))
1656 to->serial = from->serial;
1657 to->type = from->type;
1658 if (from->key_id == NULL)
1660 else if ((to->key_id = strdup(from->key_id)) == NULL)
1661 return SSH_ERR_ALLOC_FAIL;
1662 to->valid_after = from->valid_after;
1663 to->valid_before = from->valid_before;
1664 if (from->signature_key == NULL)
1665 to->signature_key = NULL;
1666 else if ((ret = sshkey_from_private(from->signature_key,
1667 &to->signature_key)) != 0)
1670 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
1671 return SSH_ERR_INVALID_ARGUMENT;
1672 if (from->nprincipals > 0) {
1673 if ((to->principals = calloc(from->nprincipals,
1674 sizeof(*to->principals))) == NULL)
1675 return SSH_ERR_ALLOC_FAIL;
1676 for (i = 0; i < from->nprincipals; i++) {
1677 to->principals[i] = strdup(from->principals[i]);
1678 if (to->principals[i] == NULL) {
1679 to->nprincipals = i;
1680 return SSH_ERR_ALLOC_FAIL;
1684 to->nprincipals = from->nprincipals;
1689 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
1691 struct sshkey *n = NULL;
1692 int ret = SSH_ERR_INTERNAL_ERROR;
1700 case KEY_DSA_CERT_V00:
1702 if ((n = sshkey_new(k->type)) == NULL)
1703 return SSH_ERR_ALLOC_FAIL;
1704 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1705 (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1706 (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1707 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
1709 return SSH_ERR_ALLOC_FAIL;
1712 # ifdef OPENSSL_HAS_ECC
1714 case KEY_ECDSA_CERT:
1715 if ((n = sshkey_new(k->type)) == NULL)
1716 return SSH_ERR_ALLOC_FAIL;
1717 n->ecdsa_nid = k->ecdsa_nid;
1718 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
1719 if (n->ecdsa == NULL) {
1721 return SSH_ERR_ALLOC_FAIL;
1723 if (EC_KEY_set_public_key(n->ecdsa,
1724 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
1726 return SSH_ERR_LIBCRYPTO_ERROR;
1729 # endif /* OPENSSL_HAS_ECC */
1732 case KEY_RSA_CERT_V00:
1734 if ((n = sshkey_new(k->type)) == NULL)
1735 return SSH_ERR_ALLOC_FAIL;
1736 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1737 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
1739 return SSH_ERR_ALLOC_FAIL;
1742 #endif /* WITH_OPENSSL */
1744 case KEY_ED25519_CERT:
1745 if ((n = sshkey_new(k->type)) == NULL)
1746 return SSH_ERR_ALLOC_FAIL;
1747 if (k->ed25519_pk != NULL) {
1748 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
1750 return SSH_ERR_ALLOC_FAIL;
1752 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1756 return SSH_ERR_KEY_TYPE_UNKNOWN;
1758 if (sshkey_is_cert(k)) {
1759 if ((ret = sshkey_cert_copy(k, n)) != 0) {
1769 cert_parse(struct sshbuf *b, struct sshkey *key, const u_char *blob,
1772 u_char *principals = NULL, *critical = NULL, *exts = NULL;
1773 u_char *sig_key = NULL, *sig = NULL;
1774 size_t signed_len, plen, clen, sklen, slen, kidlen, elen;
1777 int ret = SSH_ERR_INTERNAL_ERROR;
1778 int v00 = sshkey_cert_is_legacy(key);
1781 if ((tmp = sshbuf_new()) == NULL)
1782 return SSH_ERR_ALLOC_FAIL;
1784 /* Copy the entire key blob for verification and later serialisation */
1785 if ((ret = sshbuf_put(key->cert->certblob, blob, blen)) != 0)
1788 elen = 0; /* Not touched for v00 certs */
1789 principals = exts = critical = sig_key = sig = NULL;
1790 if ((!v00 && (ret = sshbuf_get_u64(b, &key->cert->serial)) != 0) ||
1791 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
1792 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
1793 (ret = sshbuf_get_string(b, &principals, &plen)) != 0 ||
1794 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
1795 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
1796 (ret = sshbuf_get_string(b, &critical, &clen)) != 0 ||
1797 (!v00 && (ret = sshbuf_get_string(b, &exts, &elen)) != 0) ||
1798 (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
1799 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
1800 (ret = sshbuf_get_string(b, &sig_key, &sklen)) != 0) {
1801 /* XXX debug print error for ret */
1802 ret = SSH_ERR_INVALID_FORMAT;
1806 /* Signature is left in the buffer so we can calculate this length */
1807 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1809 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1810 ret = SSH_ERR_INVALID_FORMAT;
1814 if (key->cert->type != SSH2_CERT_TYPE_USER &&
1815 key->cert->type != SSH2_CERT_TYPE_HOST) {
1816 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
1820 if ((ret = sshbuf_put(tmp, principals, plen)) != 0)
1822 while (sshbuf_len(tmp) > 0) {
1823 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
1824 ret = SSH_ERR_INVALID_FORMAT;
1827 if ((ret = sshbuf_get_cstring(tmp, &principal, &plen)) != 0) {
1828 ret = SSH_ERR_INVALID_FORMAT;
1831 oprincipals = key->cert->principals;
1832 key->cert->principals = realloc(key->cert->principals,
1833 (key->cert->nprincipals + 1) *
1834 sizeof(*key->cert->principals));
1835 if (key->cert->principals == NULL) {
1837 key->cert->principals = oprincipals;
1838 ret = SSH_ERR_ALLOC_FAIL;
1841 key->cert->principals[key->cert->nprincipals++] = principal;
1846 if ((ret = sshbuf_put(key->cert->critical, critical, clen)) != 0 ||
1847 (ret = sshbuf_put(tmp, critical, clen)) != 0)
1850 /* validate structure */
1851 while (sshbuf_len(tmp) != 0) {
1852 if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
1853 (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
1854 ret = SSH_ERR_INVALID_FORMAT;
1860 if ((ret = sshbuf_put(key->cert->extensions, exts, elen)) != 0 ||
1861 (ret = sshbuf_put(tmp, exts, elen)) != 0)
1864 /* validate structure */
1865 while (sshbuf_len(tmp) != 0) {
1866 if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
1867 (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
1868 ret = SSH_ERR_INVALID_FORMAT;
1874 if (sshkey_from_blob_internal(sig_key, sklen,
1875 &key->cert->signature_key, 0) != 0) {
1876 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1879 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1880 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1884 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1885 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0)
1900 sshkey_from_blob_internal(const u_char *blob, size_t blen,
1901 struct sshkey **keyp, int allow_cert)
1903 struct sshbuf *b = NULL;
1904 int type, nid = -1, ret = SSH_ERR_INTERNAL_ERROR;
1905 char *ktype = NULL, *curve = NULL;
1906 struct sshkey *key = NULL;
1909 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
1911 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
1913 #ifdef DEBUG_PK /* XXX */
1914 dump_base64(stderr, blob, blen);
1917 if ((b = sshbuf_from(blob, blen)) == NULL)
1918 return SSH_ERR_ALLOC_FAIL;
1919 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
1920 ret = SSH_ERR_INVALID_FORMAT;
1924 type = sshkey_type_from_name(ktype);
1925 if (sshkey_type_plain(type) == KEY_ECDSA)
1926 nid = sshkey_ecdsa_nid_from_name(ktype);
1927 if (!allow_cert && sshkey_type_is_cert(type)) {
1928 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
1934 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1935 ret = SSH_ERR_INVALID_FORMAT;
1940 case KEY_RSA_CERT_V00:
1941 if ((key = sshkey_new(type)) == NULL) {
1942 ret = SSH_ERR_ALLOC_FAIL;
1945 if (sshbuf_get_bignum2(b, key->rsa->e) == -1 ||
1946 sshbuf_get_bignum2(b, key->rsa->n) == -1) {
1947 ret = SSH_ERR_INVALID_FORMAT;
1951 RSA_print_fp(stderr, key->rsa, 8);
1955 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1956 ret = SSH_ERR_INVALID_FORMAT;
1961 case KEY_DSA_CERT_V00:
1962 if ((key = sshkey_new(type)) == NULL) {
1963 ret = SSH_ERR_ALLOC_FAIL;
1966 if (sshbuf_get_bignum2(b, key->dsa->p) == -1 ||
1967 sshbuf_get_bignum2(b, key->dsa->q) == -1 ||
1968 sshbuf_get_bignum2(b, key->dsa->g) == -1 ||
1969 sshbuf_get_bignum2(b, key->dsa->pub_key) == -1) {
1970 ret = SSH_ERR_INVALID_FORMAT;
1974 DSA_print_fp(stderr, key->dsa, 8);
1977 case KEY_ECDSA_CERT:
1978 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
1979 ret = SSH_ERR_INVALID_FORMAT;
1983 # ifdef OPENSSL_HAS_ECC
1985 if ((key = sshkey_new(type)) == NULL) {
1986 ret = SSH_ERR_ALLOC_FAIL;
1989 key->ecdsa_nid = nid;
1990 if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
1991 ret = SSH_ERR_INVALID_FORMAT;
1994 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
1995 ret = SSH_ERR_EC_CURVE_MISMATCH;
1998 if (key->ecdsa != NULL)
1999 EC_KEY_free(key->ecdsa);
2000 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
2002 ret = SSH_ERR_EC_CURVE_INVALID;
2005 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
2006 ret = SSH_ERR_ALLOC_FAIL;
2009 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
2010 ret = SSH_ERR_INVALID_FORMAT;
2013 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
2015 ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2018 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
2019 /* XXX assume it is a allocation error */
2020 ret = SSH_ERR_ALLOC_FAIL;
2024 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
2027 # endif /* OPENSSL_HAS_ECC */
2028 #endif /* WITH_OPENSSL */
2029 case KEY_ED25519_CERT:
2030 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
2031 ret = SSH_ERR_INVALID_FORMAT;
2036 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
2038 if (len != ED25519_PK_SZ) {
2039 ret = SSH_ERR_INVALID_FORMAT;
2042 if ((key = sshkey_new(type)) == NULL) {
2043 ret = SSH_ERR_ALLOC_FAIL;
2046 key->ed25519_pk = pk;
2050 if ((key = sshkey_new(type)) == NULL) {
2051 ret = SSH_ERR_ALLOC_FAIL;
2056 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2060 /* Parse certificate potion */
2061 if (sshkey_is_cert(key) &&
2062 (ret = cert_parse(b, key, blob, blen)) != 0)
2065 if (key != NULL && sshbuf_len(b) != 0) {
2066 ret = SSH_ERR_INVALID_FORMAT;
2078 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2081 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2086 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
2088 return sshkey_from_blob_internal(blob, blen, keyp, 1);
2092 sshkey_sign(const struct sshkey *key,
2093 u_char **sigp, size_t *lenp,
2094 const u_char *data, size_t datalen, u_int compat)
2100 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2101 return SSH_ERR_INVALID_ARGUMENT;
2102 switch (key->type) {
2104 case KEY_DSA_CERT_V00:
2107 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
2108 # ifdef OPENSSL_HAS_ECC
2109 case KEY_ECDSA_CERT:
2111 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
2112 # endif /* OPENSSL_HAS_ECC */
2113 case KEY_RSA_CERT_V00:
2116 return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
2117 #endif /* WITH_OPENSSL */
2119 case KEY_ED25519_CERT:
2120 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
2122 return SSH_ERR_KEY_TYPE_UNKNOWN;
2127 * ssh_key_verify returns 0 for a correct signature and < 0 on error.
2130 sshkey_verify(const struct sshkey *key,
2131 const u_char *sig, size_t siglen,
2132 const u_char *data, size_t dlen, u_int compat)
2137 if (dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
2138 return SSH_ERR_INVALID_ARGUMENT;
2139 switch (key->type) {
2141 case KEY_DSA_CERT_V00:
2144 return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
2145 # ifdef OPENSSL_HAS_ECC
2146 case KEY_ECDSA_CERT:
2148 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
2149 # endif /* OPENSSL_HAS_ECC */
2150 case KEY_RSA_CERT_V00:
2153 return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
2154 #endif /* WITH_OPENSSL */
2156 case KEY_ED25519_CERT:
2157 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
2159 return SSH_ERR_KEY_TYPE_UNKNOWN;
2163 /* Converts a private to a public key */
2165 sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
2168 int ret = SSH_ERR_INTERNAL_ERROR;
2173 if ((pk = calloc(1, sizeof(*pk))) == NULL)
2174 return SSH_ERR_ALLOC_FAIL;
2176 pk->flags = k->flags;
2177 pk->ecdsa_nid = k->ecdsa_nid;
2181 pk->ed25519_pk = NULL;
2182 pk->ed25519_sk = NULL;
2186 case KEY_RSA_CERT_V00:
2188 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2193 if ((pk->rsa = RSA_new()) == NULL ||
2194 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
2195 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
2196 ret = SSH_ERR_ALLOC_FAIL;
2200 case KEY_DSA_CERT_V00:
2202 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2206 if ((pk->dsa = DSA_new()) == NULL ||
2207 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
2208 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
2209 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
2210 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
2211 ret = SSH_ERR_ALLOC_FAIL;
2215 case KEY_ECDSA_CERT:
2216 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2219 # ifdef OPENSSL_HAS_ECC
2221 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
2222 if (pk->ecdsa == NULL) {
2223 ret = SSH_ERR_ALLOC_FAIL;
2226 if (EC_KEY_set_public_key(pk->ecdsa,
2227 EC_KEY_get0_public_key(k->ecdsa)) != 1) {
2228 ret = SSH_ERR_LIBCRYPTO_ERROR;
2232 # endif /* OPENSSL_HAS_ECC */
2233 #endif /* WITH_OPENSSL */
2234 case KEY_ED25519_CERT:
2235 if ((ret = sshkey_cert_copy(k, pk)) != 0)
2239 if (k->ed25519_pk != NULL) {
2240 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
2241 ret = SSH_ERR_ALLOC_FAIL;
2244 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
2248 ret = SSH_ERR_KEY_TYPE_UNKNOWN;
2257 /* Convert a plain key to their _CERT equivalent */
2259 sshkey_to_certified(struct sshkey *k, int legacy)
2266 newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
2269 newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
2273 return SSH_ERR_INVALID_ARGUMENT;
2274 newtype = KEY_ECDSA_CERT;
2276 #endif /* WITH_OPENSSL */
2279 return SSH_ERR_INVALID_ARGUMENT;
2280 newtype = KEY_ED25519_CERT;
2283 return SSH_ERR_INVALID_ARGUMENT;
2285 if ((k->cert = cert_new()) == NULL)
2286 return SSH_ERR_ALLOC_FAIL;
2291 /* Convert a certificate to its raw key equivalent */
2293 sshkey_drop_cert(struct sshkey *k)
2295 if (!sshkey_type_is_cert(k->type))
2296 return SSH_ERR_KEY_TYPE_UNKNOWN;
2299 k->type = sshkey_type_plain(k->type);
2303 /* Sign a certified key, (re-)generating the signed certblob. */
2305 sshkey_certify(struct sshkey *k, struct sshkey *ca)
2307 struct sshbuf *principals = NULL;
2308 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
2309 size_t i, ca_len, sig_len;
2310 int ret = SSH_ERR_INTERNAL_ERROR;
2311 struct sshbuf *cert;
2313 if (k == NULL || k->cert == NULL ||
2314 k->cert->certblob == NULL || ca == NULL)
2315 return SSH_ERR_INVALID_ARGUMENT;
2316 if (!sshkey_is_cert(k))
2317 return SSH_ERR_KEY_TYPE_UNKNOWN;
2318 if (!sshkey_type_is_valid_ca(ca->type))
2319 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2321 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2322 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
2324 cert = k->cert->certblob; /* for readability */
2326 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2329 /* -v01 certs put nonce first */
2330 arc4random_buf(&nonce, sizeof(nonce));
2331 if (!sshkey_cert_is_legacy(k)) {
2332 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2336 /* XXX this substantially duplicates to_blob(); refactor */
2339 case KEY_DSA_CERT_V00:
2341 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
2342 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
2343 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
2344 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
2347 # ifdef OPENSSL_HAS_ECC
2348 case KEY_ECDSA_CERT:
2349 if ((ret = sshbuf_put_cstring(cert,
2350 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
2351 (ret = sshbuf_put_ec(cert,
2352 EC_KEY_get0_public_key(k->ecdsa),
2353 EC_KEY_get0_group(k->ecdsa))) != 0)
2356 # endif /* OPENSSL_HAS_ECC */
2357 case KEY_RSA_CERT_V00:
2359 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
2360 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
2363 #endif /* WITH_OPENSSL */
2364 case KEY_ED25519_CERT:
2365 if ((ret = sshbuf_put_string(cert,
2366 k->ed25519_pk, ED25519_PK_SZ)) != 0)
2370 ret = SSH_ERR_INVALID_ARGUMENT;
2373 /* -v01 certs have a serial number next */
2374 if (!sshkey_cert_is_legacy(k)) {
2375 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
2379 if ((ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
2380 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2383 if ((principals = sshbuf_new()) == NULL) {
2384 ret = SSH_ERR_ALLOC_FAIL;
2387 for (i = 0; i < k->cert->nprincipals; i++) {
2388 if ((ret = sshbuf_put_cstring(principals,
2389 k->cert->principals[i])) != 0)
2392 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
2393 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
2394 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
2395 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0)
2398 /* -v01 certs have non-critical options here */
2399 if (!sshkey_cert_is_legacy(k)) {
2400 if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
2404 /* -v00 certs put the nonce at the end */
2405 if (sshkey_cert_is_legacy(k)) {
2406 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2410 if ((ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
2411 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2414 /* Sign the whole mess */
2415 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2416 sshbuf_len(cert), 0)) != 0)
2419 /* Append signature and we are done */
2420 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2426 if (sig_blob != NULL)
2428 if (ca_blob != NULL)
2430 if (principals != NULL)
2431 sshbuf_free(principals);
2436 sshkey_cert_check_authority(const struct sshkey *k,
2437 int want_host, int require_principal,
2438 const char *name, const char **reason)
2440 u_int i, principal_matches;
2441 time_t now = time(NULL);
2447 if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2448 *reason = "Certificate invalid: not a host certificate";
2449 return SSH_ERR_KEY_CERT_INVALID;
2452 if (k->cert->type != SSH2_CERT_TYPE_USER) {
2453 *reason = "Certificate invalid: not a user certificate";
2454 return SSH_ERR_KEY_CERT_INVALID;
2458 /* yikes - system clock before epoch! */
2459 *reason = "Certificate invalid: not yet valid";
2460 return SSH_ERR_KEY_CERT_INVALID;
2462 if ((u_int64_t)now < k->cert->valid_after) {
2463 *reason = "Certificate invalid: not yet valid";
2464 return SSH_ERR_KEY_CERT_INVALID;
2466 if ((u_int64_t)now >= k->cert->valid_before) {
2467 *reason = "Certificate invalid: expired";
2468 return SSH_ERR_KEY_CERT_INVALID;
2470 if (k->cert->nprincipals == 0) {
2471 if (require_principal) {
2472 *reason = "Certificate lacks principal list";
2473 return SSH_ERR_KEY_CERT_INVALID;
2475 } else if (name != NULL) {
2476 principal_matches = 0;
2477 for (i = 0; i < k->cert->nprincipals; i++) {
2478 if (strcmp(name, k->cert->principals[i]) == 0) {
2479 principal_matches = 1;
2483 if (!principal_matches) {
2484 *reason = "Certificate invalid: name is not a listed "
2486 return SSH_ERR_KEY_CERT_INVALID;
2493 sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
2495 int r = SSH_ERR_INTERNAL_ERROR;
2497 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2499 switch (key->type) {
2502 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
2503 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
2504 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2505 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2506 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2507 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2510 case KEY_RSA_CERT_V00:
2512 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2513 r = SSH_ERR_INVALID_ARGUMENT;
2516 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2517 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
2518 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
2519 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
2520 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
2524 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
2525 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
2526 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
2527 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
2528 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2531 case KEY_DSA_CERT_V00:
2533 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2534 r = SSH_ERR_INVALID_ARGUMENT;
2537 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2538 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
2541 # ifdef OPENSSL_HAS_ECC
2543 if ((r = sshbuf_put_cstring(b,
2544 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
2545 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
2546 (r = sshbuf_put_bignum2(b,
2547 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2550 case KEY_ECDSA_CERT:
2551 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2552 r = SSH_ERR_INVALID_ARGUMENT;
2555 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2556 (r = sshbuf_put_bignum2(b,
2557 EC_KEY_get0_private_key(key->ecdsa))) != 0)
2560 # endif /* OPENSSL_HAS_ECC */
2561 #endif /* WITH_OPENSSL */
2563 if ((r = sshbuf_put_string(b, key->ed25519_pk,
2564 ED25519_PK_SZ)) != 0 ||
2565 (r = sshbuf_put_string(b, key->ed25519_sk,
2566 ED25519_SK_SZ)) != 0)
2569 case KEY_ED25519_CERT:
2570 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) {
2571 r = SSH_ERR_INVALID_ARGUMENT;
2574 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 ||
2575 (r = sshbuf_put_string(b, key->ed25519_pk,
2576 ED25519_PK_SZ)) != 0 ||
2577 (r = sshbuf_put_string(b, key->ed25519_sk,
2578 ED25519_SK_SZ)) != 0)
2582 r = SSH_ERR_INVALID_ARGUMENT;
2592 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
2594 char *tname = NULL, *curve = NULL;
2595 struct sshkey *k = NULL;
2597 size_t len, pklen = 0, sklen = 0;
2598 int type, r = SSH_ERR_INTERNAL_ERROR;
2599 u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
2601 BIGNUM *exponent = NULL;
2602 #endif /* WITH_OPENSSL */
2606 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
2608 type = sshkey_type_from_name(tname);
2612 if ((k = sshkey_new_private(type)) == NULL) {
2613 r = SSH_ERR_ALLOC_FAIL;
2616 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
2617 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
2618 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
2619 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
2620 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2623 case KEY_DSA_CERT_V00:
2625 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2626 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2627 (r = sshkey_add_private(k)) != 0 ||
2628 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
2631 # ifdef OPENSSL_HAS_ECC
2633 if ((k = sshkey_new_private(type)) == NULL) {
2634 r = SSH_ERR_ALLOC_FAIL;
2637 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
2638 r = SSH_ERR_INVALID_ARGUMENT;
2641 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
2643 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
2644 r = SSH_ERR_EC_CURVE_MISMATCH;
2647 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2648 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
2649 r = SSH_ERR_LIBCRYPTO_ERROR;
2652 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
2653 (r = sshbuf_get_bignum2(buf, exponent)))
2655 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2656 r = SSH_ERR_LIBCRYPTO_ERROR;
2659 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2660 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2661 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2664 case KEY_ECDSA_CERT:
2665 if ((exponent = BN_new()) == NULL) {
2666 r = SSH_ERR_LIBCRYPTO_ERROR;
2669 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2670 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2671 (r = sshkey_add_private(k)) != 0 ||
2672 (r = sshbuf_get_bignum2(buf, exponent)) != 0)
2674 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
2675 r = SSH_ERR_LIBCRYPTO_ERROR;
2678 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2679 EC_KEY_get0_public_key(k->ecdsa)) != 0) ||
2680 (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
2683 # endif /* OPENSSL_HAS_ECC */
2685 if ((k = sshkey_new_private(type)) == NULL) {
2686 r = SSH_ERR_ALLOC_FAIL;
2689 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
2690 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
2691 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
2692 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
2693 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
2694 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
2695 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2698 case KEY_RSA_CERT_V00:
2700 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2701 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2702 (r = sshkey_add_private(k)) != 0 ||
2703 (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) ||
2704 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) ||
2705 (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) ||
2706 (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) ||
2707 (r = rsa_generate_additional_parameters(k->rsa)) != 0)
2710 #endif /* WITH_OPENSSL */
2712 if ((k = sshkey_new_private(type)) == NULL) {
2713 r = SSH_ERR_ALLOC_FAIL;
2716 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2717 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2719 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2720 r = SSH_ERR_INVALID_FORMAT;
2723 k->ed25519_pk = ed25519_pk;
2724 k->ed25519_sk = ed25519_sk;
2725 ed25519_pk = ed25519_sk = NULL;
2727 case KEY_ED25519_CERT:
2728 if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
2729 (r = sshkey_from_blob(cert, len, &k)) != 0 ||
2730 (r = sshkey_add_private(k)) != 0 ||
2731 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
2732 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
2734 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
2735 r = SSH_ERR_INVALID_FORMAT;
2738 k->ed25519_pk = ed25519_pk;
2739 k->ed25519_sk = ed25519_sk;
2740 ed25519_pk = ed25519_sk = NULL;
2743 r = SSH_ERR_KEY_TYPE_UNKNOWN;
2747 /* enable blinding */
2750 case KEY_RSA_CERT_V00:
2753 if (RSA_blinding_on(k->rsa, NULL) != 1) {
2754 r = SSH_ERR_LIBCRYPTO_ERROR;
2759 #endif /* WITH_OPENSSL */
2770 if (exponent != NULL)
2771 BN_clear_free(exponent);
2772 #endif /* WITH_OPENSSL */
2774 if (ed25519_pk != NULL) {
2775 explicit_bzero(ed25519_pk, pklen);
2778 if (ed25519_sk != NULL) {
2779 explicit_bzero(ed25519_sk, sklen);
2785 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
2787 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2790 EC_POINT *nq = NULL;
2791 BIGNUM *order, *x, *y, *tmp;
2792 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2794 if ((bnctx = BN_CTX_new()) == NULL)
2795 return SSH_ERR_ALLOC_FAIL;
2796 BN_CTX_start(bnctx);
2799 * We shouldn't ever hit this case because bignum_get_ecpoint()
2800 * refuses to load GF2m points.
2802 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2803 NID_X9_62_prime_field)
2807 if (EC_POINT_is_at_infinity(group, public))
2810 if ((x = BN_CTX_get(bnctx)) == NULL ||
2811 (y = BN_CTX_get(bnctx)) == NULL ||
2812 (order = BN_CTX_get(bnctx)) == NULL ||
2813 (tmp = BN_CTX_get(bnctx)) == NULL) {
2814 ret = SSH_ERR_ALLOC_FAIL;
2818 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2819 if (EC_GROUP_get_order(group, order, bnctx) != 1 ||
2820 EC_POINT_get_affine_coordinates_GFp(group, public,
2821 x, y, bnctx) != 1) {
2822 ret = SSH_ERR_LIBCRYPTO_ERROR;
2825 if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
2826 BN_num_bits(y) <= BN_num_bits(order) / 2)
2829 /* nQ == infinity (n == order of subgroup) */
2830 if ((nq = EC_POINT_new(group)) == NULL) {
2831 ret = SSH_ERR_ALLOC_FAIL;
2834 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) {
2835 ret = SSH_ERR_LIBCRYPTO_ERROR;
2838 if (EC_POINT_is_at_infinity(group, nq) != 1)
2841 /* x < order - 1, y < order - 1 */
2842 if (!BN_sub(tmp, order, BN_value_one())) {
2843 ret = SSH_ERR_LIBCRYPTO_ERROR;
2846 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
2857 sshkey_ec_validate_private(const EC_KEY *key)
2860 BIGNUM *order, *tmp;
2861 int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
2863 if ((bnctx = BN_CTX_new()) == NULL)
2864 return SSH_ERR_ALLOC_FAIL;
2865 BN_CTX_start(bnctx);
2867 if ((order = BN_CTX_get(bnctx)) == NULL ||
2868 (tmp = BN_CTX_get(bnctx)) == NULL) {
2869 ret = SSH_ERR_ALLOC_FAIL;
2873 /* log2(private) > log2(order)/2 */
2874 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) {
2875 ret = SSH_ERR_LIBCRYPTO_ERROR;
2878 if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2879 BN_num_bits(order) / 2)
2882 /* private < order - 1 */
2883 if (!BN_sub(tmp, order, BN_value_one())) {
2884 ret = SSH_ERR_LIBCRYPTO_ERROR;
2887 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2896 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2901 if (point == NULL) {
2902 fputs("point=(NULL)\n", stderr);
2905 if ((bnctx = BN_CTX_new()) == NULL) {
2906 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
2909 BN_CTX_start(bnctx);
2910 if ((x = BN_CTX_get(bnctx)) == NULL ||
2911 (y = BN_CTX_get(bnctx)) == NULL) {
2912 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
2915 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2916 NID_X9_62_prime_field) {
2917 fprintf(stderr, "%s: group is not a prime field\n", __func__);
2920 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
2922 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
2926 fputs("x=", stderr);
2927 BN_print_fp(stderr, x);
2928 fputs("\ny=", stderr);
2929 BN_print_fp(stderr, y);
2930 fputs("\n", stderr);
2935 sshkey_dump_ec_key(const EC_KEY *key)
2937 const BIGNUM *exponent;
2939 sshkey_dump_ec_point(EC_KEY_get0_group(key),
2940 EC_KEY_get0_public_key(key));
2941 fputs("exponent=", stderr);
2942 if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2943 fputs("(NULL)", stderr);
2945 BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2946 fputs("\n", stderr);
2948 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
2951 sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob,
2952 const char *passphrase, const char *comment, const char *ciphername,
2955 u_char *cp, *b64 = NULL, *key = NULL, *pubkeyblob = NULL;
2956 u_char salt[SALT_LEN];
2957 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2959 int r = SSH_ERR_INTERNAL_ERROR;
2960 struct sshcipher_ctx ciphercontext;
2961 const struct sshcipher *cipher;
2962 const char *kdfname = KDFNAME;
2963 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
2965 memset(&ciphercontext, 0, sizeof(ciphercontext));
2968 rounds = DEFAULT_ROUNDS;
2969 if (passphrase == NULL || !strlen(passphrase)) {
2970 ciphername = "none";
2972 } else if (ciphername == NULL)
2973 ciphername = DEFAULT_CIPHERNAME;
2974 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
2975 r = SSH_ERR_INVALID_ARGUMENT;
2978 if ((cipher = cipher_by_name(ciphername)) == NULL) {
2979 r = SSH_ERR_INTERNAL_ERROR;
2983 if ((kdf = sshbuf_new()) == NULL ||
2984 (encoded = sshbuf_new()) == NULL ||
2985 (encrypted = sshbuf_new()) == NULL) {
2986 r = SSH_ERR_ALLOC_FAIL;
2989 blocksize = cipher_blocksize(cipher);
2990 keylen = cipher_keylen(cipher);
2991 ivlen = cipher_ivlen(cipher);
2992 authlen = cipher_authlen(cipher);
2993 if ((key = calloc(1, keylen + ivlen)) == NULL) {
2994 r = SSH_ERR_ALLOC_FAIL;
2997 if (strcmp(kdfname, "bcrypt") == 0) {
2998 arc4random_buf(salt, SALT_LEN);
2999 if (bcrypt_pbkdf(passphrase, strlen(passphrase),
3000 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
3001 r = SSH_ERR_INVALID_ARGUMENT;
3004 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
3005 (r = sshbuf_put_u32(kdf, rounds)) != 0)
3007 } else if (strcmp(kdfname, "none") != 0) {
3008 /* Unsupported KDF type */
3009 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3012 if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
3013 key + keylen, ivlen, 1)) != 0)
3016 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
3017 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
3018 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
3019 (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
3020 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
3021 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
3022 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
3025 /* set up the buffer that will be encrypted */
3027 /* Random check bytes */
3028 check = arc4random();
3029 if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
3030 (r = sshbuf_put_u32(encrypted, check)) != 0)
3033 /* append private key and comment*/
3034 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 ||
3035 (r = sshbuf_put_cstring(encrypted, comment)) != 0)
3040 while (sshbuf_len(encrypted) % blocksize) {
3041 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
3045 /* length in destination buffer */
3046 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
3050 if ((r = sshbuf_reserve(encoded,
3051 sshbuf_len(encrypted) + authlen, &cp)) != 0)
3053 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3054 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
3058 if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
3059 r = SSH_ERR_ALLOC_FAIL;
3064 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
3066 for (i = 0; i < strlen(b64); i++) {
3067 if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
3069 /* insert line breaks */
3070 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3073 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
3075 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
3083 sshbuf_free(encoded);
3084 sshbuf_free(encrypted);
3085 cipher_cleanup(&ciphercontext);
3086 explicit_bzero(salt, sizeof(salt));
3088 explicit_bzero(key, keylen + ivlen);
3091 if (pubkeyblob != NULL) {
3092 explicit_bzero(pubkeyblob, pubkeylen);
3096 explicit_bzero(b64, strlen(b64));
3103 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
3104 struct sshkey **keyp, char **commentp)
3106 char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
3107 const struct sshcipher *cipher = NULL;
3109 int r = SSH_ERR_INTERNAL_ERROR;
3111 size_t i, keylen = 0, ivlen = 0, slen = 0;
3112 struct sshbuf *encoded = NULL, *decoded = NULL;
3113 struct sshbuf *kdf = NULL, *decrypted = NULL;
3114 struct sshcipher_ctx ciphercontext;
3115 struct sshkey *k = NULL;
3116 u_char *key = NULL, *salt = NULL, *dp, pad, last;
3117 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
3119 memset(&ciphercontext, 0, sizeof(ciphercontext));
3122 if (commentp != NULL)
3125 if ((encoded = sshbuf_new()) == NULL ||
3126 (decoded = sshbuf_new()) == NULL ||
3127 (decrypted = sshbuf_new()) == NULL) {
3128 r = SSH_ERR_ALLOC_FAIL;
3132 /* check preamble */
3133 cp = sshbuf_ptr(blob);
3134 encoded_len = sshbuf_len(blob);
3135 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
3136 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
3137 r = SSH_ERR_INVALID_FORMAT;
3140 cp += MARK_BEGIN_LEN;
3141 encoded_len -= MARK_BEGIN_LEN;
3143 /* Look for end marker, removing whitespace as we go */
3144 while (encoded_len > 0) {
3145 if (*cp != '\n' && *cp != '\r') {
3146 if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
3153 if (encoded_len >= MARK_END_LEN &&
3154 memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
3156 if ((r = sshbuf_put_u8(encoded, 0)) != 0)
3162 if (encoded_len == 0) {
3163 r = SSH_ERR_INVALID_FORMAT;
3168 if ((r = sshbuf_b64tod(decoded, sshbuf_ptr(encoded))) != 0)
3172 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
3173 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
3174 r = SSH_ERR_INVALID_FORMAT;
3177 /* parse public portion of key */
3178 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
3179 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
3180 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
3181 (r = sshbuf_froms(decoded, &kdf)) != 0 ||
3182 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 ||
3183 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
3184 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
3187 if ((cipher = cipher_by_name(ciphername)) == NULL) {
3188 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3191 if ((passphrase == NULL || strlen(passphrase) == 0) &&
3192 strcmp(ciphername, "none") != 0) {
3193 /* passphrase required */
3194 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3197 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
3198 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3201 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
3202 r = SSH_ERR_INVALID_FORMAT;
3206 /* XXX only one key supported */
3207 r = SSH_ERR_INVALID_FORMAT;
3211 /* check size of encrypted key blob */
3212 blocksize = cipher_blocksize(cipher);
3213 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
3214 r = SSH_ERR_INVALID_FORMAT;
3219 keylen = cipher_keylen(cipher);
3220 ivlen = cipher_ivlen(cipher);
3221 if ((key = calloc(1, keylen + ivlen)) == NULL) {
3222 r = SSH_ERR_ALLOC_FAIL;
3225 if (strcmp(kdfname, "bcrypt") == 0) {
3226 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
3227 (r = sshbuf_get_u32(kdf, &rounds)) != 0)
3229 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
3230 key, keylen + ivlen, rounds) < 0) {
3231 r = SSH_ERR_INVALID_FORMAT;
3236 /* decrypt private portion of key */
3237 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
3238 (r = cipher_init(&ciphercontext, cipher, key, keylen,
3239 key + keylen, ivlen, 0)) != 0)
3241 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded),
3242 sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 0) {
3243 /* an integrity error here indicates an incorrect passphrase */
3244 if (r == SSH_ERR_MAC_INVALID)
3245 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3248 if ((r = sshbuf_consume(decoded, encrypted_len)) != 0)
3250 /* there should be no trailing data */
3251 if (sshbuf_len(decoded) != 0) {
3252 r = SSH_ERR_INVALID_FORMAT;
3256 /* check check bytes */
3257 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
3258 (r = sshbuf_get_u32(decrypted, &check2)) != 0)
3260 if (check1 != check2) {
3261 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3265 /* Load the private key and comment */
3266 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
3267 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
3270 /* Check deterministic padding */
3272 while (sshbuf_len(decrypted)) {
3273 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
3275 if (pad != (++i & 0xff)) {
3276 r = SSH_ERR_INVALID_FORMAT;
3281 /* XXX decode pubkey and check against private */
3289 if (commentp != NULL) {
3290 *commentp = comment;
3295 cipher_cleanup(&ciphercontext);
3300 explicit_bzero(salt, slen);
3304 explicit_bzero(key, keylen + ivlen);
3307 sshbuf_free(encoded);
3308 sshbuf_free(decoded);
3310 sshbuf_free(decrypted);
3317 * Serialises the authentication (private) key to a blob, encrypting it with
3318 * passphrase. The identification of the blob (lowest 64 bits of n) will
3319 * precede the key to provide identification of the key without needing a
3323 sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
3324 const char *passphrase, const char *comment)
3326 struct sshbuf *buffer = NULL, *encrypted = NULL;
3329 struct sshcipher_ctx ciphercontext;
3330 const struct sshcipher *cipher;
3334 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
3335 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
3337 cipher_num = (strcmp(passphrase, "") == 0) ?
3338 SSH_CIPHER_NONE : SSH_CIPHER_3DES;
3339 if ((cipher = cipher_by_number(cipher_num)) == NULL)
3340 return SSH_ERR_INTERNAL_ERROR;
3342 /* This buffer is used to build the secret part of the private key. */
3343 if ((buffer = sshbuf_new()) == NULL)
3344 return SSH_ERR_ALLOC_FAIL;
3346 /* Put checkbytes for checking passphrase validity. */
3347 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
3349 arc4random_buf(cp, 2);
3350 memcpy(cp + 2, cp, 2);
3353 * Store the private key (n and e will not be stored because they
3354 * will be stored in plain text, and storing them also in encrypted
3355 * format would just give known plaintext).
3356 * Note: q and p are stored in reverse order to SSL.
3358 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
3359 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
3360 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
3361 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
3364 /* Pad the part to be encrypted to a size that is a multiple of 8. */
3365 explicit_bzero(buf, 8);
3366 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
3369 /* This buffer will be used to contain the data in the file. */
3370 if ((encrypted = sshbuf_new()) == NULL) {
3371 r = SSH_ERR_ALLOC_FAIL;
3375 /* First store keyfile id string. */
3376 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
3377 sizeof(LEGACY_BEGIN))) != 0)
3380 /* Store cipher type and "reserved" field. */
3381 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
3382 (r = sshbuf_put_u32(encrypted, 0)) != 0)
3385 /* Store public key. This will be in plain text. */
3386 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
3387 (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) ||
3388 (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) ||
3389 (r = sshbuf_put_cstring(encrypted, comment) != 0))
3392 /* Allocate space for the private part of the key in the buffer. */
3393 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
3396 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3397 CIPHER_ENCRYPT)) != 0)
3399 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3400 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
3402 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3405 r = sshbuf_putb(blob, encrypted);
3408 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3409 explicit_bzero(buf, sizeof(buf));
3411 sshbuf_free(buffer);
3412 if (encrypted != NULL)
3413 sshbuf_free(encrypted);
3417 #endif /* WITH_SSH1 */
3420 /* convert SSH v2 key in OpenSSL PEM format */
3422 sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
3423 const char *_passphrase, const char *comment)
3426 int blen, len = strlen(_passphrase);
3427 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
3428 #if (OPENSSL_VERSION_NUMBER < 0x00907000L)
3429 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
3431 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
3436 if (len > 0 && len <= 4)
3437 return SSH_ERR_PASSPHRASE_TOO_SHORT;
3438 if ((bio = BIO_new(BIO_s_mem())) == NULL)
3439 return SSH_ERR_ALLOC_FAIL;
3441 switch (key->type) {
3443 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3444 cipher, passphrase, len, NULL, NULL);
3446 #ifdef OPENSSL_HAS_ECC
3448 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3449 cipher, passphrase, len, NULL, NULL);
3453 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3454 cipher, passphrase, len, NULL, NULL);
3461 r = SSH_ERR_LIBCRYPTO_ERROR;
3464 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
3465 r = SSH_ERR_INTERNAL_ERROR;
3468 if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3475 #endif /* WITH_OPENSSL */
3477 /* Serialise "key" to buffer "blob" */
3479 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
3480 const char *passphrase, const char *comment,
3481 int force_new_format, const char *new_format_cipher, int new_format_rounds)
3483 switch (key->type) {
3486 return sshkey_private_rsa1_to_blob(key, blob,
3487 passphrase, comment);
3491 if (force_new_format) {
3492 return sshkey_private_to_blob2(key, blob, passphrase,
3493 comment, new_format_cipher, new_format_rounds);
3495 return sshkey_private_pem_to_blob(key, blob,
3496 passphrase, comment);
3497 #endif /* WITH_OPENSSL */
3499 return sshkey_private_to_blob2(key, blob, passphrase,
3500 comment, new_format_cipher, new_format_rounds);
3502 return SSH_ERR_KEY_TYPE_UNKNOWN;
3508 * Parse the public, unencrypted portion of a RSA1 key.
3511 sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
3512 struct sshkey **keyp, char **commentp)
3515 struct sshkey *pub = NULL;
3516 struct sshbuf *copy = NULL;
3520 if (commentp != NULL)
3523 /* Check that it is at least big enough to contain the ID string. */
3524 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3525 return SSH_ERR_INVALID_FORMAT;
3528 * Make sure it begins with the id string. Consume the id string
3531 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3532 return SSH_ERR_INVALID_FORMAT;
3533 /* Make a working copy of the keyblob and skip past the magic */
3534 if ((copy = sshbuf_fromb(blob)) == NULL)
3535 return SSH_ERR_ALLOC_FAIL;
3536 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3539 /* Skip cipher type, reserved data and key bits. */
3540 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
3541 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
3542 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
3545 /* Read the public key from the buffer. */
3546 if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
3547 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
3548 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
3551 /* Finally, the comment */
3552 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
3555 /* The encrypted private part is not parsed by this function. */
3573 sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
3574 struct sshkey **keyp, char **commentp)
3577 u_int16_t check1, check2;
3578 u_int8_t cipher_type;
3579 struct sshbuf *decrypted = NULL, *copy = NULL;
3581 char *comment = NULL;
3582 struct sshcipher_ctx ciphercontext;
3583 const struct sshcipher *cipher;
3584 struct sshkey *prv = NULL;
3587 if (commentp != NULL)
3590 /* Check that it is at least big enough to contain the ID string. */
3591 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
3592 return SSH_ERR_INVALID_FORMAT;
3595 * Make sure it begins with the id string. Consume the id string
3598 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
3599 return SSH_ERR_INVALID_FORMAT;
3601 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
3602 r = SSH_ERR_ALLOC_FAIL;
3605 if ((copy = sshbuf_fromb(blob)) == NULL ||
3606 (decrypted = sshbuf_new()) == NULL) {
3607 r = SSH_ERR_ALLOC_FAIL;
3610 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
3613 /* Read cipher type. */
3614 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
3615 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
3618 /* Read the public key and comment from the buffer. */
3619 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
3620 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
3621 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
3622 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
3625 /* Check that it is a supported cipher. */
3626 cipher = cipher_by_number(cipher_type);
3627 if (cipher == NULL) {
3628 r = SSH_ERR_KEY_UNKNOWN_CIPHER;
3631 /* Initialize space for decrypted data. */
3632 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
3635 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3636 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
3637 CIPHER_DECRYPT)) != 0)
3639 if ((r = cipher_crypt(&ciphercontext, 0, cp,
3640 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) {
3641 cipher_cleanup(&ciphercontext);
3644 if ((r = cipher_cleanup(&ciphercontext)) != 0)
3647 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
3648 (r = sshbuf_get_u16(decrypted, &check2)) != 0)
3650 if (check1 != check2) {
3651 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3655 /* Read the rest of the private key. */
3656 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
3657 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
3658 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
3659 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
3662 /* calculate p-1 and q-1 */
3663 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
3666 /* enable blinding */
3667 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3668 r = SSH_ERR_LIBCRYPTO_ERROR;
3674 if (commentp != NULL) {
3675 *commentp = comment;
3679 explicit_bzero(&ciphercontext, sizeof(ciphercontext));
3680 if (comment != NULL)
3686 if (decrypted != NULL)
3687 sshbuf_free(decrypted);
3690 #endif /* WITH_SSH1 */
3693 /* XXX make private once ssh-keysign.c fixed */
3695 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3696 const char *passphrase, struct sshkey **keyp, char **commentp)
3698 EVP_PKEY *pk = NULL;
3699 struct sshkey *prv = NULL;
3700 char *name = "<no key>";
3705 if (commentp != NULL)
3708 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
3709 return SSH_ERR_ALLOC_FAIL;
3710 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3711 (int)sshbuf_len(blob)) {
3712 r = SSH_ERR_ALLOC_FAIL;
3716 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
3717 (char *)passphrase)) == NULL) {
3718 r = SSH_ERR_KEY_WRONG_PASSPHRASE;
3721 if (pk->type == EVP_PKEY_RSA &&
3722 (type == KEY_UNSPEC || type == KEY_RSA)) {
3723 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3724 r = SSH_ERR_ALLOC_FAIL;
3727 prv->rsa = EVP_PKEY_get1_RSA(pk);
3728 prv->type = KEY_RSA;
3729 name = "rsa w/o comment";
3731 RSA_print_fp(stderr, prv->rsa, 8);
3733 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
3734 r = SSH_ERR_LIBCRYPTO_ERROR;
3737 } else if (pk->type == EVP_PKEY_DSA &&
3738 (type == KEY_UNSPEC || type == KEY_DSA)) {
3739 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3740 r = SSH_ERR_ALLOC_FAIL;
3743 prv->dsa = EVP_PKEY_get1_DSA(pk);
3744 prv->type = KEY_DSA;
3745 name = "dsa w/o comment";
3747 DSA_print_fp(stderr, prv->dsa, 8);
3749 #ifdef OPENSSL_HAS_ECC
3750 } else if (pk->type == EVP_PKEY_EC &&
3751 (type == KEY_UNSPEC || type == KEY_ECDSA)) {
3752 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
3753 r = SSH_ERR_ALLOC_FAIL;
3756 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3757 prv->type = KEY_ECDSA;
3758 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3759 if (prv->ecdsa_nid == -1 ||
3760 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
3761 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3762 EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
3763 sshkey_ec_validate_private(prv->ecdsa) != 0) {
3764 r = SSH_ERR_INVALID_FORMAT;
3767 name = "ecdsa w/o comment";
3769 if (prv != NULL && prv->ecdsa != NULL)
3770 sshkey_dump_ec_key(prv->ecdsa);
3772 #endif /* OPENSSL_HAS_ECC */
3774 r = SSH_ERR_INVALID_FORMAT;
3777 if (commentp != NULL &&
3778 (*commentp = strdup(name)) == NULL) {
3779 r = SSH_ERR_ALLOC_FAIL;
3793 #endif /* WITH_OPENSSL */
3796 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3797 const char *passphrase, struct sshkey **keyp, char **commentp)
3802 if (commentp != NULL)
3808 return sshkey_parse_private_rsa1(blob, passphrase,
3813 return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3815 #endif /* WITH_OPENSSL */
3817 return sshkey_parse_private2(blob, type, passphrase,
3820 if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
3824 return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
3827 return SSH_ERR_INVALID_FORMAT;
3828 #endif /* WITH_OPENSSL */
3830 return SSH_ERR_KEY_TYPE_UNKNOWN;
3835 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
3836 const char *filename, struct sshkey **keyp, char **commentp)
3842 if (commentp != NULL)
3846 /* it's a SSH v1 key if the public key part is readable */
3847 if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
3848 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
3849 passphrase, keyp, commentp);
3851 #endif /* WITH_SSH1 */
3852 if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3853 passphrase, keyp, commentp)) == 0)