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- /* $OpenBSD: sshkey.c,v 1.142 2024/01/11 01:45:36 djm Exp $ */
- /*
- * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
- * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
- * Copyright (c) 2010,2011 Damien Miller. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- #include "includes.h"
-
- #include <sys/types.h>
- #include <netinet/in.h>
-
- #ifdef WITH_OPENSSL
- #include <openssl/evp.h>
- #include <openssl/err.h>
- #include <openssl/pem.h>
- #endif
-
- #include "crypto_api.h"
-
- #include <errno.h>
- #include <limits.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <resolv.h>
- #include <time.h>
- #ifdef HAVE_UTIL_H
- #include <util.h>
- #endif /* HAVE_UTIL_H */
-
- #include "ssh2.h"
- #include "ssherr.h"
- #include "misc.h"
- #include "sshbuf.h"
- #include "cipher.h"
- #include "digest.h"
- #define SSHKEY_INTERNAL
- #include "sshkey.h"
- #include "match.h"
- #include "ssh-sk.h"
-
- #ifdef WITH_XMSS
- #include "sshkey-xmss.h"
- #include "xmss_fast.h"
- #endif
-
- #include "openbsd-compat/openssl-compat.h"
-
- /* openssh private key file format */
- #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
- #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
- #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1)
- #define MARK_END_LEN (sizeof(MARK_END) - 1)
- #define KDFNAME "bcrypt"
- #define AUTH_MAGIC "openssh-key-v1"
- #define SALT_LEN 16
- #define DEFAULT_CIPHERNAME "aes256-ctr"
- #define DEFAULT_ROUNDS 24
-
- /* Version identification string for SSH v1 identity files. */
- #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
-
- /*
- * Constants relating to "shielding" support; protection of keys expected
- * to remain in memory for long durations
- */
- #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024)
- #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */
- #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512
-
- int sshkey_private_serialize_opt(struct sshkey *key,
- struct sshbuf *buf, enum sshkey_serialize_rep);
- static int sshkey_from_blob_internal(struct sshbuf *buf,
- struct sshkey **keyp, int allow_cert);
-
- /* Supported key types */
- extern const struct sshkey_impl sshkey_ed25519_impl;
- extern const struct sshkey_impl sshkey_ed25519_cert_impl;
- extern const struct sshkey_impl sshkey_ed25519_sk_impl;
- extern const struct sshkey_impl sshkey_ed25519_sk_cert_impl;
- #ifdef WITH_OPENSSL
- # ifdef OPENSSL_HAS_ECC
- # ifdef ENABLE_SK
- extern const struct sshkey_impl sshkey_ecdsa_sk_impl;
- extern const struct sshkey_impl sshkey_ecdsa_sk_cert_impl;
- extern const struct sshkey_impl sshkey_ecdsa_sk_webauthn_impl;
- # endif /* ENABLE_SK */
- extern const struct sshkey_impl sshkey_ecdsa_nistp256_impl;
- extern const struct sshkey_impl sshkey_ecdsa_nistp256_cert_impl;
- extern const struct sshkey_impl sshkey_ecdsa_nistp384_impl;
- extern const struct sshkey_impl sshkey_ecdsa_nistp384_cert_impl;
- # ifdef OPENSSL_HAS_NISTP521
- extern const struct sshkey_impl sshkey_ecdsa_nistp521_impl;
- extern const struct sshkey_impl sshkey_ecdsa_nistp521_cert_impl;
- # endif /* OPENSSL_HAS_NISTP521 */
- # endif /* OPENSSL_HAS_ECC */
- extern const struct sshkey_impl sshkey_rsa_impl;
- extern const struct sshkey_impl sshkey_rsa_cert_impl;
- extern const struct sshkey_impl sshkey_rsa_sha256_impl;
- extern const struct sshkey_impl sshkey_rsa_sha256_cert_impl;
- extern const struct sshkey_impl sshkey_rsa_sha512_impl;
- extern const struct sshkey_impl sshkey_rsa_sha512_cert_impl;
- # ifdef WITH_DSA
- extern const struct sshkey_impl sshkey_dss_impl;
- extern const struct sshkey_impl sshkey_dsa_cert_impl;
- # endif
- #endif /* WITH_OPENSSL */
- #ifdef WITH_XMSS
- extern const struct sshkey_impl sshkey_xmss_impl;
- extern const struct sshkey_impl sshkey_xmss_cert_impl;
- #endif
-
- const struct sshkey_impl * const keyimpls[] = {
- &sshkey_ed25519_impl,
- &sshkey_ed25519_cert_impl,
- #ifdef ENABLE_SK
- &sshkey_ed25519_sk_impl,
- &sshkey_ed25519_sk_cert_impl,
- #endif
- #ifdef WITH_OPENSSL
- # ifdef OPENSSL_HAS_ECC
- &sshkey_ecdsa_nistp256_impl,
- &sshkey_ecdsa_nistp256_cert_impl,
- &sshkey_ecdsa_nistp384_impl,
- &sshkey_ecdsa_nistp384_cert_impl,
- # ifdef OPENSSL_HAS_NISTP521
- &sshkey_ecdsa_nistp521_impl,
- &sshkey_ecdsa_nistp521_cert_impl,
- # endif /* OPENSSL_HAS_NISTP521 */
- # ifdef ENABLE_SK
- &sshkey_ecdsa_sk_impl,
- &sshkey_ecdsa_sk_cert_impl,
- &sshkey_ecdsa_sk_webauthn_impl,
- # endif /* ENABLE_SK */
- # endif /* OPENSSL_HAS_ECC */
- # ifdef WITH_DSA
- &sshkey_dss_impl,
- &sshkey_dsa_cert_impl,
- # endif
- &sshkey_rsa_impl,
- &sshkey_rsa_cert_impl,
- &sshkey_rsa_sha256_impl,
- &sshkey_rsa_sha256_cert_impl,
- &sshkey_rsa_sha512_impl,
- &sshkey_rsa_sha512_cert_impl,
- #endif /* WITH_OPENSSL */
- #ifdef WITH_XMSS
- &sshkey_xmss_impl,
- &sshkey_xmss_cert_impl,
- #endif
- NULL
- };
-
- static const struct sshkey_impl *
- sshkey_impl_from_type(int type)
- {
- int i;
-
- for (i = 0; keyimpls[i] != NULL; i++) {
- if (keyimpls[i]->type == type)
- return keyimpls[i];
- }
- return NULL;
- }
-
- static const struct sshkey_impl *
- sshkey_impl_from_type_nid(int type, int nid)
- {
- int i;
-
- for (i = 0; keyimpls[i] != NULL; i++) {
- if (keyimpls[i]->type == type &&
- (keyimpls[i]->nid == 0 || keyimpls[i]->nid == nid))
- return keyimpls[i];
- }
- return NULL;
- }
-
- static const struct sshkey_impl *
- sshkey_impl_from_key(const struct sshkey *k)
- {
- if (k == NULL)
- return NULL;
- return sshkey_impl_from_type_nid(k->type, k->ecdsa_nid);
- }
-
- const char *
- sshkey_type(const struct sshkey *k)
- {
- const struct sshkey_impl *impl;
-
- if ((impl = sshkey_impl_from_key(k)) == NULL)
- return "unknown";
- return impl->shortname;
- }
-
- static const char *
- sshkey_ssh_name_from_type_nid(int type, int nid)
- {
- const struct sshkey_impl *impl;
-
- if ((impl = sshkey_impl_from_type_nid(type, nid)) == NULL)
- return "ssh-unknown";
- return impl->name;
- }
-
- int
- sshkey_type_is_cert(int type)
- {
- const struct sshkey_impl *impl;
-
- if ((impl = sshkey_impl_from_type(type)) == NULL)
- return 0;
- return impl->cert;
- }
-
- const char *
- sshkey_ssh_name(const struct sshkey *k)
- {
- return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
- }
-
- const char *
- sshkey_ssh_name_plain(const struct sshkey *k)
- {
- return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
- k->ecdsa_nid);
- }
-
- int
- sshkey_type_from_name(const char *name)
- {
- int i;
- const struct sshkey_impl *impl;
-
- for (i = 0; keyimpls[i] != NULL; i++) {
- impl = keyimpls[i];
- /* Only allow shortname matches for plain key types */
- if ((impl->name != NULL && strcmp(name, impl->name) == 0) ||
- (!impl->cert && strcasecmp(impl->shortname, name) == 0))
- return impl->type;
- }
- return KEY_UNSPEC;
- }
-
- static int
- key_type_is_ecdsa_variant(int type)
- {
- switch (type) {
- case KEY_ECDSA:
- case KEY_ECDSA_CERT:
- case KEY_ECDSA_SK:
- case KEY_ECDSA_SK_CERT:
- return 1;
- }
- return 0;
- }
-
- int
- sshkey_ecdsa_nid_from_name(const char *name)
- {
- int i;
-
- for (i = 0; keyimpls[i] != NULL; i++) {
- if (!key_type_is_ecdsa_variant(keyimpls[i]->type))
- continue;
- if (keyimpls[i]->name != NULL &&
- strcmp(name, keyimpls[i]->name) == 0)
- return keyimpls[i]->nid;
- }
- return -1;
- }
-
- int
- sshkey_match_keyname_to_sigalgs(const char *keyname, const char *sigalgs)
- {
- int ktype;
-
- if (sigalgs == NULL || *sigalgs == '\0' ||
- (ktype = sshkey_type_from_name(keyname)) == KEY_UNSPEC)
- return 0;
- else if (ktype == KEY_RSA) {
- return match_pattern_list("ssh-rsa", sigalgs, 0) == 1 ||
- match_pattern_list("rsa-sha2-256", sigalgs, 0) == 1 ||
- match_pattern_list("rsa-sha2-512", sigalgs, 0) == 1;
- } else if (ktype == KEY_RSA_CERT) {
- return match_pattern_list("ssh-rsa-cert-v01@openssh.com",
- sigalgs, 0) == 1 ||
- match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
- sigalgs, 0) == 1 ||
- match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
- sigalgs, 0) == 1;
- } else
- return match_pattern_list(keyname, sigalgs, 0) == 1;
- }
-
- char *
- sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
- {
- char *tmp, *ret = NULL;
- size_t i, nlen, rlen = 0;
- const struct sshkey_impl *impl;
-
- for (i = 0; keyimpls[i] != NULL; i++) {
- impl = keyimpls[i];
- if (impl->name == NULL)
- continue;
- if (!include_sigonly && impl->sigonly)
- continue;
- if ((certs_only && !impl->cert) || (plain_only && impl->cert))
- continue;
- if (ret != NULL)
- ret[rlen++] = sep;
- nlen = strlen(impl->name);
- if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
- free(ret);
- return NULL;
- }
- ret = tmp;
- memcpy(ret + rlen, impl->name, nlen + 1);
- rlen += nlen;
- }
- return ret;
- }
-
- int
- sshkey_names_valid2(const char *names, int allow_wildcard, int plain_only)
- {
- char *s, *cp, *p;
- const struct sshkey_impl *impl;
- int i, type;
-
- if (names == NULL || strcmp(names, "") == 0)
- return 0;
- if ((s = cp = strdup(names)) == NULL)
- return 0;
- for ((p = strsep(&cp, ",")); p && *p != '\0';
- (p = strsep(&cp, ","))) {
- type = sshkey_type_from_name(p);
- if (type == KEY_UNSPEC) {
- if (allow_wildcard) {
- /*
- * Try matching key types against the string.
- * If any has a positive or negative match then
- * the component is accepted.
- */
- impl = NULL;
- for (i = 0; keyimpls[i] != NULL; i++) {
- if (match_pattern_list(
- keyimpls[i]->name, p, 0) != 0) {
- impl = keyimpls[i];
- break;
- }
- }
- if (impl != NULL)
- continue;
- }
- free(s);
- return 0;
- } else if (plain_only && sshkey_type_is_cert(type)) {
- free(s);
- return 0;
- }
- }
- free(s);
- return 1;
- }
-
- u_int
- sshkey_size(const struct sshkey *k)
- {
- const struct sshkey_impl *impl;
-
- if ((impl = sshkey_impl_from_key(k)) == NULL)
- return 0;
- if (impl->funcs->size != NULL)
- return impl->funcs->size(k);
- return impl->keybits;
- }
-
- static int
- sshkey_type_is_valid_ca(int type)
- {
- const struct sshkey_impl *impl;
-
- if ((impl = sshkey_impl_from_type(type)) == NULL)
- return 0;
- /* All non-certificate types may act as CAs */
- return !impl->cert;
- }
-
- int
- sshkey_is_cert(const struct sshkey *k)
- {
- if (k == NULL)
- return 0;
- return sshkey_type_is_cert(k->type);
- }
-
- int
- sshkey_is_sk(const struct sshkey *k)
- {
- if (k == NULL)
- return 0;
- switch (sshkey_type_plain(k->type)) {
- case KEY_ECDSA_SK:
- case KEY_ED25519_SK:
- return 1;
- default:
- return 0;
- }
- }
-
- /* Return the cert-less equivalent to a certified key type */
- int
- sshkey_type_plain(int type)
- {
- switch (type) {
- case KEY_RSA_CERT:
- return KEY_RSA;
- case KEY_DSA_CERT:
- return KEY_DSA;
- case KEY_ECDSA_CERT:
- return KEY_ECDSA;
- case KEY_ECDSA_SK_CERT:
- return KEY_ECDSA_SK;
- case KEY_ED25519_CERT:
- return KEY_ED25519;
- case KEY_ED25519_SK_CERT:
- return KEY_ED25519_SK;
- case KEY_XMSS_CERT:
- return KEY_XMSS;
- default:
- return type;
- }
- }
-
- /* Return the cert equivalent to a plain key type */
- static int
- sshkey_type_certified(int type)
- {
- switch (type) {
- case KEY_RSA:
- return KEY_RSA_CERT;
- case KEY_DSA:
- return KEY_DSA_CERT;
- case KEY_ECDSA:
- return KEY_ECDSA_CERT;
- case KEY_ECDSA_SK:
- return KEY_ECDSA_SK_CERT;
- case KEY_ED25519:
- return KEY_ED25519_CERT;
- case KEY_ED25519_SK:
- return KEY_ED25519_SK_CERT;
- case KEY_XMSS:
- return KEY_XMSS_CERT;
- default:
- return -1;
- }
- }
-
- #ifdef WITH_OPENSSL
- /* XXX: these are really begging for a table-driven approach */
- int
- sshkey_curve_name_to_nid(const char *name)
- {
- if (strcmp(name, "nistp256") == 0)
- return NID_X9_62_prime256v1;
- else if (strcmp(name, "nistp384") == 0)
- return NID_secp384r1;
- # ifdef OPENSSL_HAS_NISTP521
- else if (strcmp(name, "nistp521") == 0)
- return NID_secp521r1;
- # endif /* OPENSSL_HAS_NISTP521 */
- else
- return -1;
- }
-
- u_int
- sshkey_curve_nid_to_bits(int nid)
- {
- switch (nid) {
- case NID_X9_62_prime256v1:
- return 256;
- case NID_secp384r1:
- return 384;
- # ifdef OPENSSL_HAS_NISTP521
- case NID_secp521r1:
- return 521;
- # endif /* OPENSSL_HAS_NISTP521 */
- default:
- return 0;
- }
- }
-
- int
- sshkey_ecdsa_bits_to_nid(int bits)
- {
- switch (bits) {
- case 256:
- return NID_X9_62_prime256v1;
- case 384:
- return NID_secp384r1;
- # ifdef OPENSSL_HAS_NISTP521
- case 521:
- return NID_secp521r1;
- # endif /* OPENSSL_HAS_NISTP521 */
- default:
- return -1;
- }
- }
-
- const char *
- sshkey_curve_nid_to_name(int nid)
- {
- switch (nid) {
- case NID_X9_62_prime256v1:
- return "nistp256";
- case NID_secp384r1:
- return "nistp384";
- # ifdef OPENSSL_HAS_NISTP521
- case NID_secp521r1:
- return "nistp521";
- # endif /* OPENSSL_HAS_NISTP521 */
- default:
- return NULL;
- }
- }
-
- int
- sshkey_ec_nid_to_hash_alg(int nid)
- {
- int kbits = sshkey_curve_nid_to_bits(nid);
-
- if (kbits <= 0)
- return -1;
-
- /* RFC5656 section 6.2.1 */
- if (kbits <= 256)
- return SSH_DIGEST_SHA256;
- else if (kbits <= 384)
- return SSH_DIGEST_SHA384;
- else
- return SSH_DIGEST_SHA512;
- }
- #endif /* WITH_OPENSSL */
-
- static void
- cert_free(struct sshkey_cert *cert)
- {
- u_int i;
-
- if (cert == NULL)
- return;
- sshbuf_free(cert->certblob);
- sshbuf_free(cert->critical);
- sshbuf_free(cert->extensions);
- free(cert->key_id);
- for (i = 0; i < cert->nprincipals; i++)
- free(cert->principals[i]);
- free(cert->principals);
- sshkey_free(cert->signature_key);
- free(cert->signature_type);
- freezero(cert, sizeof(*cert));
- }
-
- static struct sshkey_cert *
- cert_new(void)
- {
- struct sshkey_cert *cert;
-
- if ((cert = calloc(1, sizeof(*cert))) == NULL)
- return NULL;
- if ((cert->certblob = sshbuf_new()) == NULL ||
- (cert->critical = sshbuf_new()) == NULL ||
- (cert->extensions = sshbuf_new()) == NULL) {
- cert_free(cert);
- return NULL;
- }
- cert->key_id = NULL;
- cert->principals = NULL;
- cert->signature_key = NULL;
- cert->signature_type = NULL;
- return cert;
- }
-
- struct sshkey *
- sshkey_new(int type)
- {
- struct sshkey *k;
- const struct sshkey_impl *impl = NULL;
-
- if (type != KEY_UNSPEC &&
- (impl = sshkey_impl_from_type(type)) == NULL)
- return NULL;
-
- /* All non-certificate types may act as CAs */
- if ((k = calloc(1, sizeof(*k))) == NULL)
- return NULL;
- k->type = type;
- k->ecdsa_nid = -1;
- if (impl != NULL && impl->funcs->alloc != NULL) {
- if (impl->funcs->alloc(k) != 0) {
- free(k);
- return NULL;
- }
- }
- if (sshkey_is_cert(k)) {
- if ((k->cert = cert_new()) == NULL) {
- sshkey_free(k);
- return NULL;
- }
- }
-
- return k;
- }
-
- /* Frees common FIDO fields */
- void
- sshkey_sk_cleanup(struct sshkey *k)
- {
- free(k->sk_application);
- sshbuf_free(k->sk_key_handle);
- sshbuf_free(k->sk_reserved);
- k->sk_application = NULL;
- k->sk_key_handle = k->sk_reserved = NULL;
- }
-
- static void
- sshkey_free_contents(struct sshkey *k)
- {
- const struct sshkey_impl *impl;
-
- if (k == NULL)
- return;
- if ((impl = sshkey_impl_from_type(k->type)) != NULL &&
- impl->funcs->cleanup != NULL)
- impl->funcs->cleanup(k);
- if (sshkey_is_cert(k))
- cert_free(k->cert);
- freezero(k->shielded_private, k->shielded_len);
- freezero(k->shield_prekey, k->shield_prekey_len);
- }
-
- void
- sshkey_free(struct sshkey *k)
- {
- sshkey_free_contents(k);
- freezero(k, sizeof(*k));
- }
-
- static int
- cert_compare(struct sshkey_cert *a, struct sshkey_cert *b)
- {
- if (a == NULL && b == NULL)
- return 1;
- if (a == NULL || b == NULL)
- return 0;
- if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
- return 0;
- if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
- sshbuf_len(a->certblob)) != 0)
- return 0;
- return 1;
- }
-
- /* Compares FIDO-specific pubkey fields only */
- int
- sshkey_sk_fields_equal(const struct sshkey *a, const struct sshkey *b)
- {
- if (a->sk_application == NULL || b->sk_application == NULL)
- return 0;
- if (strcmp(a->sk_application, b->sk_application) != 0)
- return 0;
- return 1;
- }
-
- /*
- * Compare public portions of key only, allowing comparisons between
- * certificates and plain keys too.
- */
- int
- sshkey_equal_public(const struct sshkey *a, const struct sshkey *b)
- {
- const struct sshkey_impl *impl;
-
- if (a == NULL || b == NULL ||
- sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
- return 0;
- if ((impl = sshkey_impl_from_type(a->type)) == NULL)
- return 0;
- return impl->funcs->equal(a, b);
- }
-
- int
- sshkey_equal(const struct sshkey *a, const struct sshkey *b)
- {
- if (a == NULL || b == NULL || a->type != b->type)
- return 0;
- if (sshkey_is_cert(a)) {
- if (!cert_compare(a->cert, b->cert))
- return 0;
- }
- return sshkey_equal_public(a, b);
- }
-
-
- /* Serialise common FIDO key parts */
- int
- sshkey_serialize_sk(const struct sshkey *key, struct sshbuf *b)
- {
- int r;
-
- if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0)
- return r;
-
- return 0;
- }
-
- static int
- to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain,
- enum sshkey_serialize_rep opts)
- {
- int type, ret = SSH_ERR_INTERNAL_ERROR;
- const char *typename;
- const struct sshkey_impl *impl;
-
- if (key == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
-
- type = force_plain ? sshkey_type_plain(key->type) : key->type;
-
- if (sshkey_type_is_cert(type)) {
- if (key->cert == NULL)
- return SSH_ERR_EXPECTED_CERT;
- if (sshbuf_len(key->cert->certblob) == 0)
- return SSH_ERR_KEY_LACKS_CERTBLOB;
- /* Use the existing blob */
- if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
- return ret;
- return 0;
- }
- if ((impl = sshkey_impl_from_type(type)) == NULL)
- return SSH_ERR_KEY_TYPE_UNKNOWN;
-
- typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
- if ((ret = sshbuf_put_cstring(b, typename)) != 0)
- return ret;
- return impl->funcs->serialize_public(key, b, opts);
- }
-
- int
- sshkey_putb(const struct sshkey *key, struct sshbuf *b)
- {
- return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
- }
-
- int
- sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b,
- enum sshkey_serialize_rep opts)
- {
- struct sshbuf *tmp;
- int r;
-
- if ((tmp = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- r = to_blob_buf(key, tmp, 0, opts);
- if (r == 0)
- r = sshbuf_put_stringb(b, tmp);
- sshbuf_free(tmp);
- return r;
- }
-
- int
- sshkey_puts(const struct sshkey *key, struct sshbuf *b)
- {
- return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
- }
-
- int
- sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
- {
- return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
- }
-
- static int
- to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain,
- enum sshkey_serialize_rep opts)
- {
- int ret = SSH_ERR_INTERNAL_ERROR;
- size_t len;
- struct sshbuf *b = NULL;
-
- if (lenp != NULL)
- *lenp = 0;
- if (blobp != NULL)
- *blobp = NULL;
- if ((b = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
- goto out;
- len = sshbuf_len(b);
- if (lenp != NULL)
- *lenp = len;
- if (blobp != NULL) {
- if ((*blobp = malloc(len)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- memcpy(*blobp, sshbuf_ptr(b), len);
- }
- ret = 0;
- out:
- sshbuf_free(b);
- return ret;
- }
-
- int
- sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
- {
- return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
- }
-
- int
- sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
- {
- return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
- }
-
- int
- sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
- u_char **retp, size_t *lenp)
- {
- u_char *blob = NULL, *ret = NULL;
- size_t blob_len = 0;
- int r = SSH_ERR_INTERNAL_ERROR;
-
- if (retp != NULL)
- *retp = NULL;
- if (lenp != NULL)
- *lenp = 0;
- if (ssh_digest_bytes(dgst_alg) == 0) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
- != 0)
- goto out;
- if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
- ret, SSH_DIGEST_MAX_LENGTH)) != 0)
- goto out;
- /* success */
- if (retp != NULL) {
- *retp = ret;
- ret = NULL;
- }
- if (lenp != NULL)
- *lenp = ssh_digest_bytes(dgst_alg);
- r = 0;
- out:
- free(ret);
- if (blob != NULL)
- freezero(blob, blob_len);
- return r;
- }
-
- static char *
- fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
- {
- char *ret;
- size_t plen = strlen(alg) + 1;
- size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
-
- if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL)
- return NULL;
- strlcpy(ret, alg, rlen);
- strlcat(ret, ":", rlen);
- if (dgst_raw_len == 0)
- return ret;
- if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
- freezero(ret, rlen);
- return NULL;
- }
- /* Trim padding characters from end */
- ret[strcspn(ret, "=")] = '\0';
- return ret;
- }
-
- static char *
- fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len)
- {
- char *retval, hex[5];
- size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
-
- if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL)
- return NULL;
- strlcpy(retval, alg, rlen);
- strlcat(retval, ":", rlen);
- for (i = 0; i < dgst_raw_len; i++) {
- snprintf(hex, sizeof(hex), "%s%02x",
- i > 0 ? ":" : "", dgst_raw[i]);
- strlcat(retval, hex, rlen);
- }
- return retval;
- }
-
- static char *
- fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
- {
- char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
- char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
- 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
- u_int i, j = 0, rounds, seed = 1;
- char *retval;
-
- rounds = (dgst_raw_len / 2) + 1;
- if ((retval = calloc(rounds, 6)) == NULL)
- return NULL;
- retval[j++] = 'x';
- for (i = 0; i < rounds; i++) {
- u_int idx0, idx1, idx2, idx3, idx4;
- if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
- idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
- seed) % 6;
- idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
- idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
- (seed / 6)) % 6;
- retval[j++] = vowels[idx0];
- retval[j++] = consonants[idx1];
- retval[j++] = vowels[idx2];
- if ((i + 1) < rounds) {
- idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
- idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
- retval[j++] = consonants[idx3];
- retval[j++] = '-';
- retval[j++] = consonants[idx4];
- seed = ((seed * 5) +
- ((((u_int)(dgst_raw[2 * i])) * 7) +
- ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
- }
- } else {
- idx0 = seed % 6;
- idx1 = 16;
- idx2 = seed / 6;
- retval[j++] = vowels[idx0];
- retval[j++] = consonants[idx1];
- retval[j++] = vowels[idx2];
- }
- }
- retval[j++] = 'x';
- retval[j++] = '\0';
- return retval;
- }
-
- /*
- * Draw an ASCII-Art representing the fingerprint so human brain can
- * profit from its built-in pattern recognition ability.
- * This technique is called "random art" and can be found in some
- * scientific publications like this original paper:
- *
- * "Hash Visualization: a New Technique to improve Real-World Security",
- * Perrig A. and Song D., 1999, International Workshop on Cryptographic
- * Techniques and E-Commerce (CrypTEC '99)
- * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
- *
- * The subject came up in a talk by Dan Kaminsky, too.
- *
- * If you see the picture is different, the key is different.
- * If the picture looks the same, you still know nothing.
- *
- * The algorithm used here is a worm crawling over a discrete plane,
- * leaving a trace (augmenting the field) everywhere it goes.
- * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
- * makes the respective movement vector be ignored for this turn.
- * Graphs are not unambiguous, because circles in graphs can be
- * walked in either direction.
- */
-
- /*
- * Field sizes for the random art. Have to be odd, so the starting point
- * can be in the exact middle of the picture, and FLDBASE should be >=8 .
- * Else pictures would be too dense, and drawing the frame would
- * fail, too, because the key type would not fit in anymore.
- */
- #define FLDBASE 8
- #define FLDSIZE_Y (FLDBASE + 1)
- #define FLDSIZE_X (FLDBASE * 2 + 1)
- static char *
- fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len,
- const struct sshkey *k)
- {
- /*
- * Chars to be used after each other every time the worm
- * intersects with itself. Matter of taste.
- */
- char *augmentation_string = " .o+=*BOX@%&#/^SE";
- char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X];
- u_char field[FLDSIZE_X][FLDSIZE_Y];
- size_t i, tlen, hlen;
- u_int b;
- int x, y, r;
- size_t len = strlen(augmentation_string) - 1;
-
- if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL)
- return NULL;
-
- /* initialize field */
- memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
- x = FLDSIZE_X / 2;
- y = FLDSIZE_Y / 2;
-
- /* process raw key */
- for (i = 0; i < dgst_raw_len; i++) {
- int input;
- /* each byte conveys four 2-bit move commands */
- input = dgst_raw[i];
- for (b = 0; b < 4; b++) {
- /* evaluate 2 bit, rest is shifted later */
- x += (input & 0x1) ? 1 : -1;
- y += (input & 0x2) ? 1 : -1;
-
- /* assure we are still in bounds */
- x = MAXIMUM(x, 0);
- y = MAXIMUM(y, 0);
- x = MINIMUM(x, FLDSIZE_X - 1);
- y = MINIMUM(y, FLDSIZE_Y - 1);
-
- /* augment the field */
- if (field[x][y] < len - 2)
- field[x][y]++;
- input = input >> 2;
- }
- }
-
- /* mark starting point and end point*/
- field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
- field[x][y] = len;
-
- /* assemble title */
- r = snprintf(title, sizeof(title), "[%s %u]",
- sshkey_type(k), sshkey_size(k));
- /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
- if (r < 0 || r > (int)sizeof(title))
- r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
- tlen = (r <= 0) ? 0 : strlen(title);
-
- /* assemble hash ID. */
- r = snprintf(hash, sizeof(hash), "[%s]", alg);
- hlen = (r <= 0) ? 0 : strlen(hash);
-
- /* output upper border */
- p = retval;
- *p++ = '+';
- for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++)
- *p++ = '-';
- memcpy(p, title, tlen);
- p += tlen;
- for (i += tlen; i < FLDSIZE_X; i++)
- *p++ = '-';
- *p++ = '+';
- *p++ = '\n';
-
- /* output content */
- for (y = 0; y < FLDSIZE_Y; y++) {
- *p++ = '|';
- for (x = 0; x < FLDSIZE_X; x++)
- *p++ = augmentation_string[MINIMUM(field[x][y], len)];
- *p++ = '|';
- *p++ = '\n';
- }
-
- /* output lower border */
- *p++ = '+';
- for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++)
- *p++ = '-';
- memcpy(p, hash, hlen);
- p += hlen;
- for (i += hlen; i < FLDSIZE_X; i++)
- *p++ = '-';
- *p++ = '+';
-
- return retval;
- }
-
- char *
- sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
- enum sshkey_fp_rep dgst_rep)
- {
- char *retval = NULL;
- u_char *dgst_raw;
- size_t dgst_raw_len;
-
- if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
- return NULL;
- switch (dgst_rep) {
- case SSH_FP_DEFAULT:
- if (dgst_alg == SSH_DIGEST_MD5) {
- retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
- dgst_raw, dgst_raw_len);
- } else {
- retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
- dgst_raw, dgst_raw_len);
- }
- break;
- case SSH_FP_HEX:
- retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
- dgst_raw, dgst_raw_len);
- break;
- case SSH_FP_BASE64:
- retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
- dgst_raw, dgst_raw_len);
- break;
- case SSH_FP_BUBBLEBABBLE:
- retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
- break;
- case SSH_FP_RANDOMART:
- retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
- dgst_raw, dgst_raw_len, k);
- break;
- default:
- freezero(dgst_raw, dgst_raw_len);
- return NULL;
- }
- freezero(dgst_raw, dgst_raw_len);
- return retval;
- }
-
- static int
- peek_type_nid(const char *s, size_t l, int *nid)
- {
- const struct sshkey_impl *impl;
- int i;
-
- for (i = 0; keyimpls[i] != NULL; i++) {
- impl = keyimpls[i];
- if (impl->name == NULL || strlen(impl->name) != l)
- continue;
- if (memcmp(s, impl->name, l) == 0) {
- *nid = -1;
- if (key_type_is_ecdsa_variant(impl->type))
- *nid = impl->nid;
- return impl->type;
- }
- }
- return KEY_UNSPEC;
- }
-
- /* XXX this can now be made const char * */
- int
- sshkey_read(struct sshkey *ret, char **cpp)
- {
- struct sshkey *k;
- char *cp, *blobcopy;
- size_t space;
- int r, type, curve_nid = -1;
- struct sshbuf *blob;
-
- if (ret == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
-
- /* Decode type */
- cp = *cpp;
- space = strcspn(cp, " \t");
- if (space == strlen(cp))
- return SSH_ERR_INVALID_FORMAT;
- if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
- return SSH_ERR_INVALID_FORMAT;
-
- /* skip whitespace */
- for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
- ;
- if (*cp == '\0')
- return SSH_ERR_INVALID_FORMAT;
- if (ret->type != KEY_UNSPEC && ret->type != type)
- return SSH_ERR_KEY_TYPE_MISMATCH;
- if ((blob = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
-
- /* find end of keyblob and decode */
- space = strcspn(cp, " \t");
- if ((blobcopy = strndup(cp, space)) == NULL) {
- sshbuf_free(blob);
- return SSH_ERR_ALLOC_FAIL;
- }
- if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
- free(blobcopy);
- sshbuf_free(blob);
- return r;
- }
- free(blobcopy);
- if ((r = sshkey_fromb(blob, &k)) != 0) {
- sshbuf_free(blob);
- return r;
- }
- sshbuf_free(blob);
-
- /* skip whitespace and leave cp at start of comment */
- for (cp += space; *cp == ' ' || *cp == '\t'; cp++)
- ;
-
- /* ensure type of blob matches type at start of line */
- if (k->type != type) {
- sshkey_free(k);
- return SSH_ERR_KEY_TYPE_MISMATCH;
- }
- if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
- sshkey_free(k);
- return SSH_ERR_EC_CURVE_MISMATCH;
- }
-
- /* Fill in ret from parsed key */
- sshkey_free_contents(ret);
- *ret = *k;
- freezero(k, sizeof(*k));
-
- /* success */
- *cpp = cp;
- return 0;
- }
-
- int
- sshkey_to_base64(const struct sshkey *key, char **b64p)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
- struct sshbuf *b = NULL;
- char *uu = NULL;
-
- if (b64p != NULL)
- *b64p = NULL;
- if ((b = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((r = sshkey_putb(key, b)) != 0)
- goto out;
- if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- /* Success */
- if (b64p != NULL) {
- *b64p = uu;
- uu = NULL;
- }
- r = 0;
- out:
- sshbuf_free(b);
- free(uu);
- return r;
- }
-
- int
- sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
- char *uu = NULL;
-
- if ((r = sshkey_to_base64(key, &uu)) != 0)
- goto out;
- if ((r = sshbuf_putf(b, "%s %s",
- sshkey_ssh_name(key), uu)) != 0)
- goto out;
- r = 0;
- out:
- free(uu);
- return r;
- }
-
- int
- sshkey_write(const struct sshkey *key, FILE *f)
- {
- struct sshbuf *b = NULL;
- int r = SSH_ERR_INTERNAL_ERROR;
-
- if ((b = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((r = sshkey_format_text(key, b)) != 0)
- goto out;
- if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
- if (feof(f))
- errno = EPIPE;
- r = SSH_ERR_SYSTEM_ERROR;
- goto out;
- }
- /* Success */
- r = 0;
- out:
- sshbuf_free(b);
- return r;
- }
-
- const char *
- sshkey_cert_type(const struct sshkey *k)
- {
- switch (k->cert->type) {
- case SSH2_CERT_TYPE_USER:
- return "user";
- case SSH2_CERT_TYPE_HOST:
- return "host";
- default:
- return "unknown";
- }
- }
-
- int
- sshkey_check_rsa_length(const struct sshkey *k, int min_size)
- {
- #ifdef WITH_OPENSSL
- const BIGNUM *rsa_n;
- int nbits;
-
- if (k == NULL || k->rsa == NULL ||
- (k->type != KEY_RSA && k->type != KEY_RSA_CERT))
- return 0;
- RSA_get0_key(k->rsa, &rsa_n, NULL, NULL);
- nbits = BN_num_bits(rsa_n);
- if (nbits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
- (min_size > 0 && nbits < min_size))
- return SSH_ERR_KEY_LENGTH;
- #endif /* WITH_OPENSSL */
- return 0;
- }
-
- #ifdef WITH_OPENSSL
- # ifdef OPENSSL_HAS_ECC
- int
- sshkey_ecdsa_key_to_nid(EC_KEY *k)
- {
- EC_GROUP *eg;
- int nids[] = {
- NID_X9_62_prime256v1,
- NID_secp384r1,
- # ifdef OPENSSL_HAS_NISTP521
- NID_secp521r1,
- # endif /* OPENSSL_HAS_NISTP521 */
- -1
- };
- int nid;
- u_int i;
- const EC_GROUP *g = EC_KEY_get0_group(k);
-
- /*
- * The group may be stored in a ASN.1 encoded private key in one of two
- * ways: as a "named group", which is reconstituted by ASN.1 object ID
- * or explicit group parameters encoded into the key blob. Only the
- * "named group" case sets the group NID for us, but we can figure
- * it out for the other case by comparing against all the groups that
- * are supported.
- */
- if ((nid = EC_GROUP_get_curve_name(g)) > 0)
- return nid;
- for (i = 0; nids[i] != -1; i++) {
- if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
- return -1;
- if (EC_GROUP_cmp(g, eg, NULL) == 0)
- break;
- EC_GROUP_free(eg);
- }
- if (nids[i] != -1) {
- /* Use the group with the NID attached */
- EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
- if (EC_KEY_set_group(k, eg) != 1) {
- EC_GROUP_free(eg);
- return -1;
- }
- }
- return nids[i];
- }
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
-
- int
- sshkey_generate(int type, u_int bits, struct sshkey **keyp)
- {
- struct sshkey *k;
- int ret = SSH_ERR_INTERNAL_ERROR;
- const struct sshkey_impl *impl;
-
- if (keyp == NULL || sshkey_type_is_cert(type))
- return SSH_ERR_INVALID_ARGUMENT;
- *keyp = NULL;
- if ((impl = sshkey_impl_from_type(type)) == NULL)
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- if (impl->funcs->generate == NULL)
- return SSH_ERR_FEATURE_UNSUPPORTED;
- if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- k->type = type;
- if ((ret = impl->funcs->generate(k, bits)) != 0) {
- sshkey_free(k);
- return ret;
- }
- /* success */
- *keyp = k;
- return 0;
- }
-
- int
- sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key)
- {
- u_int i;
- const struct sshkey_cert *from;
- struct sshkey_cert *to;
- int r = SSH_ERR_INTERNAL_ERROR;
-
- if (to_key == NULL || (from = from_key->cert) == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
-
- if ((to = cert_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
-
- if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
- (r = sshbuf_putb(to->critical, from->critical)) != 0 ||
- (r = sshbuf_putb(to->extensions, from->extensions)) != 0)
- goto out;
-
- to->serial = from->serial;
- to->type = from->type;
- if (from->key_id == NULL)
- to->key_id = NULL;
- else if ((to->key_id = strdup(from->key_id)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- to->valid_after = from->valid_after;
- to->valid_before = from->valid_before;
- if (from->signature_key == NULL)
- to->signature_key = NULL;
- else if ((r = sshkey_from_private(from->signature_key,
- &to->signature_key)) != 0)
- goto out;
- if (from->signature_type != NULL &&
- (to->signature_type = strdup(from->signature_type)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if (from->nprincipals > 0) {
- if ((to->principals = calloc(from->nprincipals,
- sizeof(*to->principals))) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- for (i = 0; i < from->nprincipals; i++) {
- to->principals[i] = strdup(from->principals[i]);
- if (to->principals[i] == NULL) {
- to->nprincipals = i;
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- }
- }
- to->nprincipals = from->nprincipals;
-
- /* success */
- cert_free(to_key->cert);
- to_key->cert = to;
- to = NULL;
- r = 0;
- out:
- cert_free(to);
- return r;
- }
-
- int
- sshkey_copy_public_sk(const struct sshkey *from, struct sshkey *to)
- {
- /* Append security-key application string */
- if ((to->sk_application = strdup(from->sk_application)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- return 0;
- }
-
- int
- sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
- {
- struct sshkey *n = NULL;
- int r = SSH_ERR_INTERNAL_ERROR;
- const struct sshkey_impl *impl;
-
- *pkp = NULL;
- if ((impl = sshkey_impl_from_key(k)) == NULL)
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- if ((n = sshkey_new(k->type)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = impl->funcs->copy_public(k, n)) != 0)
- goto out;
- if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
- goto out;
- /* success */
- *pkp = n;
- n = NULL;
- r = 0;
- out:
- sshkey_free(n);
- return r;
- }
-
- int
- sshkey_is_shielded(struct sshkey *k)
- {
- return k != NULL && k->shielded_private != NULL;
- }
-
- int
- sshkey_shield_private(struct sshkey *k)
- {
- struct sshbuf *prvbuf = NULL;
- u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH];
- struct sshcipher_ctx *cctx = NULL;
- const struct sshcipher *cipher;
- size_t i, enclen = 0;
- struct sshkey *kswap = NULL, tmp;
- int r = SSH_ERR_INTERNAL_ERROR;
-
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
- #endif
- if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
- ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
- r = SSH_ERR_INTERNAL_ERROR;
- goto out;
- }
-
- /* Prepare a random pre-key, and from it an ephemeral key */
- if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN);
- if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
- prekey, SSHKEY_SHIELD_PREKEY_LEN,
- keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
- goto out;
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: key+iv\n", __func__);
- sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
- stderr);
- #endif
- if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
- keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
- goto out;
-
- /* Serialise and encrypt the private key using the ephemeral key */
- if ((prvbuf = sshbuf_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
- goto out;
- if ((r = sshkey_private_serialize_opt(k, prvbuf,
- SSHKEY_SERIALIZE_SHIELD)) != 0)
- goto out;
- /* pad to cipher blocksize */
- i = 0;
- while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
- if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
- goto out;
- }
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: serialised\n", __func__);
- sshbuf_dump(prvbuf, stderr);
- #endif
- /* encrypt */
- enclen = sshbuf_len(prvbuf);
- if ((enc = malloc(enclen)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = cipher_crypt(cctx, 0, enc,
- sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
- goto out;
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: encrypted\n", __func__);
- sshbuf_dump_data(enc, enclen, stderr);
- #endif
-
- /* Make a scrubbed, public-only copy of our private key argument */
- if ((r = sshkey_from_private(k, &kswap)) != 0)
- goto out;
-
- /* Swap the private key out (it will be destroyed below) */
- tmp = *kswap;
- *kswap = *k;
- *k = tmp;
-
- /* Insert the shielded key into our argument */
- k->shielded_private = enc;
- k->shielded_len = enclen;
- k->shield_prekey = prekey;
- k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN;
- enc = prekey = NULL; /* transferred */
- enclen = 0;
-
- /* preserve key fields that are required for correct operation */
- k->sk_flags = kswap->sk_flags;
-
- /* success */
- r = 0;
-
- out:
- /* XXX behaviour on error - invalidate original private key? */
- cipher_free(cctx);
- explicit_bzero(keyiv, sizeof(keyiv));
- explicit_bzero(&tmp, sizeof(tmp));
- freezero(enc, enclen);
- freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN);
- sshkey_free(kswap);
- sshbuf_free(prvbuf);
- return r;
- }
-
- /* Check deterministic padding after private key */
- static int
- private2_check_padding(struct sshbuf *decrypted)
- {
- u_char pad;
- size_t i;
- int r;
-
- i = 0;
- while (sshbuf_len(decrypted)) {
- if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
- goto out;
- if (pad != (++i & 0xff)) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- }
- /* success */
- r = 0;
- out:
- explicit_bzero(&pad, sizeof(pad));
- explicit_bzero(&i, sizeof(i));
- return r;
- }
-
- int
- sshkey_unshield_private(struct sshkey *k)
- {
- struct sshbuf *prvbuf = NULL;
- u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH];
- struct sshcipher_ctx *cctx = NULL;
- const struct sshcipher *cipher;
- struct sshkey *kswap = NULL, tmp;
- int r = SSH_ERR_INTERNAL_ERROR;
-
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
- #endif
- if (!sshkey_is_shielded(k))
- return 0; /* nothing to do */
-
- if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
- ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) {
- r = SSH_ERR_INTERNAL_ERROR;
- goto out;
- }
- /* check size of shielded key blob */
- if (k->shielded_len < cipher_blocksize(cipher) ||
- (k->shielded_len % cipher_blocksize(cipher)) != 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* Calculate the ephemeral key from the prekey */
- if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH,
- k->shield_prekey, k->shield_prekey_len,
- keyiv, SSH_DIGEST_MAX_LENGTH)) != 0)
- goto out;
- if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
- keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
- goto out;
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: key+iv\n", __func__);
- sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH),
- stderr);
- #endif
-
- /* Decrypt and parse the shielded private key using the ephemeral key */
- if ((prvbuf = sshbuf_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
- goto out;
- /* decrypt */
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: encrypted\n", __func__);
- sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr);
- #endif
- if ((r = cipher_crypt(cctx, 0, cp,
- k->shielded_private, k->shielded_len, 0, 0)) != 0)
- goto out;
- #ifdef DEBUG_PK
- fprintf(stderr, "%s: serialised\n", __func__);
- sshbuf_dump(prvbuf, stderr);
- #endif
- /* Parse private key */
- if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
- goto out;
-
- if ((r = private2_check_padding(prvbuf)) != 0)
- goto out;
-
- /* Swap the parsed key back into place */
- tmp = *kswap;
- *kswap = *k;
- *k = tmp;
-
- /* success */
- r = 0;
-
- out:
- cipher_free(cctx);
- explicit_bzero(keyiv, sizeof(keyiv));
- explicit_bzero(&tmp, sizeof(tmp));
- sshkey_free(kswap);
- sshbuf_free(prvbuf);
- return r;
- }
-
- static int
- cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf)
- {
- struct sshbuf *principals = NULL, *crit = NULL;
- struct sshbuf *exts = NULL, *ca = NULL;
- u_char *sig = NULL;
- size_t signed_len = 0, slen = 0, kidlen = 0;
- int ret = SSH_ERR_INTERNAL_ERROR;
-
- /* Copy the entire key blob for verification and later serialisation */
- if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
- return ret;
-
- /* Parse body of certificate up to signature */
- if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 ||
- (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 ||
- (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 ||
- (ret = sshbuf_froms(b, &principals)) != 0 ||
- (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
- (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
- (ret = sshbuf_froms(b, &crit)) != 0 ||
- (ret = sshbuf_froms(b, &exts)) != 0 ||
- (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
- (ret = sshbuf_froms(b, &ca)) != 0) {
- /* XXX debug print error for ret */
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* Signature is left in the buffer so we can calculate this length */
- signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
-
- if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- if (key->cert->type != SSH2_CERT_TYPE_USER &&
- key->cert->type != SSH2_CERT_TYPE_HOST) {
- ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE;
- goto out;
- }
-
- /* Parse principals section */
- while (sshbuf_len(principals) > 0) {
- char *principal = NULL;
- char **oprincipals = NULL;
-
- if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- if ((ret = sshbuf_get_cstring(principals, &principal,
- NULL)) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- oprincipals = key->cert->principals;
- key->cert->principals = recallocarray(key->cert->principals,
- key->cert->nprincipals, key->cert->nprincipals + 1,
- sizeof(*key->cert->principals));
- if (key->cert->principals == NULL) {
- free(principal);
- key->cert->principals = oprincipals;
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- key->cert->principals[key->cert->nprincipals++] = principal;
- }
-
- /*
- * Stash a copies of the critical options and extensions sections
- * for later use.
- */
- if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 ||
- (exts != NULL &&
- (ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
- goto out;
-
- /*
- * Validate critical options and extensions sections format.
- */
- while (sshbuf_len(crit) != 0) {
- if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 ||
- (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) {
- sshbuf_reset(key->cert->critical);
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- }
- while (exts != NULL && sshbuf_len(exts) != 0) {
- if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 ||
- (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) {
- sshbuf_reset(key->cert->extensions);
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- }
-
- /* Parse CA key and check signature */
- if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
- ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
- goto out;
- }
- if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
- ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
- goto out;
- }
- if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
- sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0)
- goto out;
- if ((ret = sshkey_get_sigtype(sig, slen,
- &key->cert->signature_type)) != 0)
- goto out;
-
- /* Success */
- ret = 0;
- out:
- sshbuf_free(ca);
- sshbuf_free(crit);
- sshbuf_free(exts);
- sshbuf_free(principals);
- free(sig);
- return ret;
- }
-
- int
- sshkey_deserialize_sk(struct sshbuf *b, struct sshkey *key)
- {
- /* Parse additional security-key application string */
- if (sshbuf_get_cstring(b, &key->sk_application, NULL) != 0)
- return SSH_ERR_INVALID_FORMAT;
- return 0;
- }
-
- static int
- sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp,
- int allow_cert)
- {
- int type, ret = SSH_ERR_INTERNAL_ERROR;
- char *ktype = NULL;
- struct sshkey *key = NULL;
- struct sshbuf *copy;
- const struct sshkey_impl *impl;
-
- #ifdef DEBUG_PK /* XXX */
- sshbuf_dump(b, stderr);
- #endif
- if (keyp != NULL)
- *keyp = NULL;
- if ((copy = sshbuf_fromb(b)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- type = sshkey_type_from_name(ktype);
- if (!allow_cert && sshkey_type_is_cert(type)) {
- ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
- goto out;
- }
- if ((impl = sshkey_impl_from_type(type)) == NULL) {
- ret = SSH_ERR_KEY_TYPE_UNKNOWN;
- goto out;
- }
- if ((key = sshkey_new(type)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (sshkey_type_is_cert(type)) {
- /* Skip nonce that precedes all certificates */
- if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- }
- if ((ret = impl->funcs->deserialize_public(ktype, b, key)) != 0)
- goto out;
-
- /* Parse certificate potion */
- if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
- goto out;
-
- if (key != NULL && sshbuf_len(b) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- ret = 0;
- if (keyp != NULL) {
- *keyp = key;
- key = NULL;
- }
- out:
- sshbuf_free(copy);
- sshkey_free(key);
- free(ktype);
- return ret;
- }
-
- int
- sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp)
- {
- struct sshbuf *b;
- int r;
-
- if ((b = sshbuf_from(blob, blen)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- r = sshkey_from_blob_internal(b, keyp, 1);
- sshbuf_free(b);
- return r;
- }
-
- int
- sshkey_fromb(struct sshbuf *b, struct sshkey **keyp)
- {
- return sshkey_from_blob_internal(b, keyp, 1);
- }
-
- int
- sshkey_froms(struct sshbuf *buf, struct sshkey **keyp)
- {
- struct sshbuf *b;
- int r;
-
- if ((r = sshbuf_froms(buf, &b)) != 0)
- return r;
- r = sshkey_from_blob_internal(b, keyp, 1);
- sshbuf_free(b);
- return r;
- }
-
- int
- sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep)
- {
- int r;
- struct sshbuf *b = NULL;
- char *sigtype = NULL;
-
- if (sigtypep != NULL)
- *sigtypep = NULL;
- if ((b = sshbuf_from(sig, siglen)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0)
- goto out;
- /* success */
- if (sigtypep != NULL) {
- *sigtypep = sigtype;
- sigtype = NULL;
- }
- r = 0;
- out:
- free(sigtype);
- sshbuf_free(b);
- return r;
- }
-
- /*
- *
- * Checks whether a certificate's signature type is allowed.
- * Returns 0 (success) if the certificate signature type appears in the
- * "allowed" pattern-list, or the key is not a certificate to begin with.
- * Otherwise returns a ssherr.h code.
- */
- int
- sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed)
- {
- if (key == NULL || allowed == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if (!sshkey_type_is_cert(key->type))
- return 0;
- if (key->cert == NULL || key->cert->signature_type == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
- return SSH_ERR_SIGN_ALG_UNSUPPORTED;
- return 0;
- }
-
- /*
- * Returns the expected signature algorithm for a given public key algorithm.
- */
- const char *
- sshkey_sigalg_by_name(const char *name)
- {
- const struct sshkey_impl *impl;
- int i;
-
- for (i = 0; keyimpls[i] != NULL; i++) {
- impl = keyimpls[i];
- if (strcmp(impl->name, name) != 0)
- continue;
- if (impl->sigalg != NULL)
- return impl->sigalg;
- if (!impl->cert)
- return impl->name;
- return sshkey_ssh_name_from_type_nid(
- sshkey_type_plain(impl->type), impl->nid);
- }
- return NULL;
- }
-
- /*
- * Verifies that the signature algorithm appearing inside the signature blob
- * matches that which was requested.
- */
- int
- sshkey_check_sigtype(const u_char *sig, size_t siglen,
- const char *requested_alg)
- {
- const char *expected_alg;
- char *sigtype = NULL;
- int r;
-
- if (requested_alg == NULL)
- return 0;
- if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
- return r;
- r = strcmp(expected_alg, sigtype) == 0;
- free(sigtype);
- return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED;
- }
-
- int
- sshkey_sign(struct sshkey *key,
- u_char **sigp, size_t *lenp,
- const u_char *data, size_t datalen,
- const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
- {
- int was_shielded = sshkey_is_shielded(key);
- int r2, r = SSH_ERR_INTERNAL_ERROR;
- const struct sshkey_impl *impl;
-
- if (sigp != NULL)
- *sigp = NULL;
- if (lenp != NULL)
- *lenp = 0;
- if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((impl = sshkey_impl_from_key(key)) == NULL)
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- if ((r = sshkey_unshield_private(key)) != 0)
- return r;
- if (sshkey_is_sk(key)) {
- r = sshsk_sign(sk_provider, key, sigp, lenp, data,
- datalen, compat, sk_pin);
- } else {
- if (impl->funcs->sign == NULL)
- r = SSH_ERR_SIGN_ALG_UNSUPPORTED;
- else {
- r = impl->funcs->sign(key, sigp, lenp, data, datalen,
- alg, sk_provider, sk_pin, compat);
- }
- }
- if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
- return r2;
- return r;
- }
-
- /*
- * ssh_key_verify returns 0 for a correct signature and < 0 on error.
- * If "alg" specified, then the signature must use that algorithm.
- */
- int
- sshkey_verify(const struct sshkey *key,
- const u_char *sig, size_t siglen,
- const u_char *data, size_t dlen, const char *alg, u_int compat,
- struct sshkey_sig_details **detailsp)
- {
- const struct sshkey_impl *impl;
-
- if (detailsp != NULL)
- *detailsp = NULL;
- if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((impl = sshkey_impl_from_key(key)) == NULL)
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- return impl->funcs->verify(key, sig, siglen, data, dlen,
- alg, compat, detailsp);
- }
-
- /* Convert a plain key to their _CERT equivalent */
- int
- sshkey_to_certified(struct sshkey *k)
- {
- int newtype;
-
- if ((newtype = sshkey_type_certified(k->type)) == -1)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((k->cert = cert_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- k->type = newtype;
- return 0;
- }
-
- /* Convert a certificate to its raw key equivalent */
- int
- sshkey_drop_cert(struct sshkey *k)
- {
- if (!sshkey_type_is_cert(k->type))
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- cert_free(k->cert);
- k->cert = NULL;
- k->type = sshkey_type_plain(k->type);
- return 0;
- }
-
- /* Sign a certified key, (re-)generating the signed certblob. */
- int
- sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg,
- const char *sk_provider, const char *sk_pin,
- sshkey_certify_signer *signer, void *signer_ctx)
- {
- const struct sshkey_impl *impl;
- struct sshbuf *principals = NULL;
- u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32];
- size_t i, ca_len, sig_len;
- int ret = SSH_ERR_INTERNAL_ERROR;
- struct sshbuf *cert = NULL;
- char *sigtype = NULL;
-
- if (k == NULL || k->cert == NULL ||
- k->cert->certblob == NULL || ca == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if (!sshkey_is_cert(k))
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- if (!sshkey_type_is_valid_ca(ca->type))
- return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
- if ((impl = sshkey_impl_from_key(k)) == NULL)
- return SSH_ERR_INTERNAL_ERROR;
-
- /*
- * If no alg specified as argument but a signature_type was set,
- * then prefer that. If both were specified, then they must match.
- */
- if (alg == NULL)
- alg = k->cert->signature_type;
- else if (k->cert->signature_type != NULL &&
- strcmp(alg, k->cert->signature_type) != 0)
- return SSH_ERR_INVALID_ARGUMENT;
-
- /*
- * If no signing algorithm or signature_type was specified and we're
- * using a RSA key, then default to a good signature algorithm.
- */
- if (alg == NULL && ca->type == KEY_RSA)
- alg = "rsa-sha2-512";
-
- if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
- return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY;
-
- cert = k->cert->certblob; /* for readability */
- sshbuf_reset(cert);
- if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
- goto out;
-
- /* -v01 certs put nonce first */
- arc4random_buf(&nonce, sizeof(nonce));
- if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
- goto out;
-
- /* Public key next */
- if ((ret = impl->funcs->serialize_public(k, cert,
- SSHKEY_SERIALIZE_DEFAULT)) != 0)
- goto out;
-
- /* Then remaining cert fields */
- if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 ||
- (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 ||
- (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
- goto out;
-
- if ((principals = sshbuf_new()) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- for (i = 0; i < k->cert->nprincipals; i++) {
- if ((ret = sshbuf_put_cstring(principals,
- k->cert->principals[i])) != 0)
- goto out;
- }
- if ((ret = sshbuf_put_stringb(cert, principals)) != 0 ||
- (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 ||
- (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 ||
- (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 ||
- (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 ||
- (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */
- (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
- goto out;
-
- /* Sign the whole mess */
- if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
- sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
- goto out;
- /* Check and update signature_type against what was actually used */
- if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
- goto out;
- if (alg != NULL && strcmp(alg, sigtype) != 0) {
- ret = SSH_ERR_SIGN_ALG_UNSUPPORTED;
- goto out;
- }
- if (k->cert->signature_type == NULL) {
- k->cert->signature_type = sigtype;
- sigtype = NULL;
- }
- /* Append signature and we are done */
- if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
- goto out;
- ret = 0;
- out:
- if (ret != 0)
- sshbuf_reset(cert);
- free(sig_blob);
- free(ca_blob);
- free(sigtype);
- sshbuf_free(principals);
- return ret;
- }
-
- static int
- default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
- const u_char *data, size_t datalen,
- const char *alg, const char *sk_provider, const char *sk_pin,
- u_int compat, void *ctx)
- {
- if (ctx != NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- return sshkey_sign(key, sigp, lenp, data, datalen, alg,
- sk_provider, sk_pin, compat);
- }
-
- int
- sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg,
- const char *sk_provider, const char *sk_pin)
- {
- return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
- default_key_sign, NULL);
- }
-
- int
- sshkey_cert_check_authority(const struct sshkey *k,
- int want_host, int require_principal, int wildcard_pattern,
- uint64_t verify_time, const char *name, const char **reason)
- {
- u_int i, principal_matches;
-
- if (reason == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if (!sshkey_is_cert(k)) {
- *reason = "Key is not a certificate";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- if (want_host) {
- if (k->cert->type != SSH2_CERT_TYPE_HOST) {
- *reason = "Certificate invalid: not a host certificate";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- } else {
- if (k->cert->type != SSH2_CERT_TYPE_USER) {
- *reason = "Certificate invalid: not a user certificate";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- }
- if (verify_time < k->cert->valid_after) {
- *reason = "Certificate invalid: not yet valid";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- if (verify_time >= k->cert->valid_before) {
- *reason = "Certificate invalid: expired";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- if (k->cert->nprincipals == 0) {
- if (require_principal) {
- *reason = "Certificate lacks principal list";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- } else if (name != NULL) {
- principal_matches = 0;
- for (i = 0; i < k->cert->nprincipals; i++) {
- if (wildcard_pattern) {
- if (match_pattern(k->cert->principals[i],
- name)) {
- principal_matches = 1;
- break;
- }
- } else if (strcmp(name, k->cert->principals[i]) == 0) {
- principal_matches = 1;
- break;
- }
- }
- if (!principal_matches) {
- *reason = "Certificate invalid: name is not a listed "
- "principal";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- }
- return 0;
- }
-
- int
- sshkey_cert_check_authority_now(const struct sshkey *k,
- int want_host, int require_principal, int wildcard_pattern,
- const char *name, const char **reason)
- {
- time_t now;
-
- if ((now = time(NULL)) < 0) {
- /* yikes - system clock before epoch! */
- *reason = "Certificate invalid: not yet valid";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- return sshkey_cert_check_authority(k, want_host, require_principal,
- wildcard_pattern, (uint64_t)now, name, reason);
- }
-
- int
- sshkey_cert_check_host(const struct sshkey *key, const char *host,
- int wildcard_principals, const char *ca_sign_algorithms,
- const char **reason)
- {
- int r;
-
- if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
- host, reason)) != 0)
- return r;
- if (sshbuf_len(key->cert->critical) != 0) {
- *reason = "Certificate contains unsupported critical options";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- if (ca_sign_algorithms != NULL &&
- (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
- *reason = "Certificate signed with disallowed algorithm";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- return 0;
- }
-
- size_t
- sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
- {
- char from[32], to[32], ret[128];
-
- *from = *to = '\0';
- if (cert->valid_after == 0 &&
- cert->valid_before == 0xffffffffffffffffULL)
- return strlcpy(s, "forever", l);
-
- if (cert->valid_after != 0)
- format_absolute_time(cert->valid_after, from, sizeof(from));
- if (cert->valid_before != 0xffffffffffffffffULL)
- format_absolute_time(cert->valid_before, to, sizeof(to));
-
- if (cert->valid_after == 0)
- snprintf(ret, sizeof(ret), "before %s", to);
- else if (cert->valid_before == 0xffffffffffffffffULL)
- snprintf(ret, sizeof(ret), "after %s", from);
- else
- snprintf(ret, sizeof(ret), "from %s to %s", from, to);
-
- return strlcpy(s, ret, l);
- }
-
- /* Common serialization for FIDO private keys */
- int
- sshkey_serialize_private_sk(const struct sshkey *key, struct sshbuf *b)
- {
- int r;
-
- if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0 ||
- (r = sshbuf_put_u8(b, key->sk_flags)) != 0 ||
- (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 ||
- (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
- return r;
-
- return 0;
- }
-
- int
- sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf,
- enum sshkey_serialize_rep opts)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
- int was_shielded = sshkey_is_shielded(key);
- struct sshbuf *b = NULL;
- const struct sshkey_impl *impl;
-
- if ((impl = sshkey_impl_from_key(key)) == NULL)
- return SSH_ERR_INTERNAL_ERROR;
- if ((r = sshkey_unshield_private(key)) != 0)
- return r;
- if ((b = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
- goto out;
- if (sshkey_is_cert(key)) {
- if (key->cert == NULL ||
- sshbuf_len(key->cert->certblob) == 0) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0)
- goto out;
- }
- if ((r = impl->funcs->serialize_private(key, b, opts)) != 0)
- goto out;
-
- /*
- * success (but we still need to append the output to buf after
- * possibly re-shielding the private key)
- */
- r = 0;
- out:
- if (was_shielded)
- r = sshkey_shield_private(key);
- if (r == 0)
- r = sshbuf_putb(buf, b);
- sshbuf_free(b);
-
- return r;
- }
-
- int
- sshkey_private_serialize(struct sshkey *key, struct sshbuf *b)
- {
- return sshkey_private_serialize_opt(key, b,
- SSHKEY_SERIALIZE_DEFAULT);
- }
-
- /* Shared deserialization of FIDO private key components */
- int
- sshkey_private_deserialize_sk(struct sshbuf *buf, struct sshkey *k)
- {
- int r;
-
- if ((k->sk_key_handle = sshbuf_new()) == NULL ||
- (k->sk_reserved = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((r = sshbuf_get_cstring(buf, &k->sk_application, NULL)) != 0 ||
- (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 ||
- (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 ||
- (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
- return r;
-
- return 0;
- }
-
- int
- sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
- {
- const struct sshkey_impl *impl;
- char *tname = NULL;
- char *expect_sk_application = NULL;
- u_char *expect_ed25519_pk = NULL;
- struct sshkey *k = NULL;
- int type, r = SSH_ERR_INTERNAL_ERROR;
-
- if (kp != NULL)
- *kp = NULL;
- if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
- goto out;
- type = sshkey_type_from_name(tname);
- if (sshkey_type_is_cert(type)) {
- /*
- * Certificate key private keys begin with the certificate
- * itself. Make sure this matches the type of the enclosing
- * private key.
- */
- if ((r = sshkey_froms(buf, &k)) != 0)
- goto out;
- if (k->type != type) {
- r = SSH_ERR_KEY_CERT_MISMATCH;
- goto out;
- }
- /* For ECDSA keys, the group must match too */
- if (k->type == KEY_ECDSA &&
- k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
- r = SSH_ERR_KEY_CERT_MISMATCH;
- goto out;
- }
- /*
- * Several fields are redundant between certificate and
- * private key body, we require these to match.
- */
- expect_sk_application = k->sk_application;
- expect_ed25519_pk = k->ed25519_pk;
- k->sk_application = NULL;
- k->ed25519_pk = NULL;
- /* XXX xmss too or refactor */
- } else {
- if ((k = sshkey_new(type)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- }
- if ((impl = sshkey_impl_from_type(type)) == NULL) {
- r = SSH_ERR_INTERNAL_ERROR;
- goto out;
- }
- if ((r = impl->funcs->deserialize_private(tname, buf, k)) != 0)
- goto out;
-
- /* XXX xmss too or refactor */
- if ((expect_sk_application != NULL && (k->sk_application == NULL ||
- strcmp(expect_sk_application, k->sk_application) != 0)) ||
- (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
- memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
- r = SSH_ERR_KEY_CERT_MISMATCH;
- goto out;
- }
- /* success */
- r = 0;
- if (kp != NULL) {
- *kp = k;
- k = NULL;
- }
- out:
- free(tname);
- sshkey_free(k);
- free(expect_sk_application);
- free(expect_ed25519_pk);
- return r;
- }
-
- #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
- int
- sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
- {
- EC_POINT *nq = NULL;
- BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL;
- int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
-
- /*
- * NB. This assumes OpenSSL has already verified that the public
- * point lies on the curve. This is done by EC_POINT_oct2point()
- * implicitly calling EC_POINT_is_on_curve(). If this code is ever
- * reachable with public points not unmarshalled using
- * EC_POINT_oct2point then the caller will need to explicitly check.
- */
-
- /*
- * We shouldn't ever hit this case because bignum_get_ecpoint()
- * refuses to load GF2m points.
- */
- if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
- NID_X9_62_prime_field)
- goto out;
-
- /* Q != infinity */
- if (EC_POINT_is_at_infinity(group, public))
- goto out;
-
- if ((x = BN_new()) == NULL ||
- (y = BN_new()) == NULL ||
- (order = BN_new()) == NULL ||
- (tmp = BN_new()) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
-
- /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
- if (EC_GROUP_get_order(group, order, NULL) != 1 ||
- EC_POINT_get_affine_coordinates_GFp(group, public,
- x, y, NULL) != 1) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (BN_num_bits(x) <= BN_num_bits(order) / 2 ||
- BN_num_bits(y) <= BN_num_bits(order) / 2)
- goto out;
-
- /* nQ == infinity (n == order of subgroup) */
- if ((nq = EC_POINT_new(group)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (EC_POINT_is_at_infinity(group, nq) != 1)
- goto out;
-
- /* x < order - 1, y < order - 1 */
- if (!BN_sub(tmp, order, BN_value_one())) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0)
- goto out;
- ret = 0;
- out:
- BN_clear_free(x);
- BN_clear_free(y);
- BN_clear_free(order);
- BN_clear_free(tmp);
- EC_POINT_free(nq);
- return ret;
- }
-
- int
- sshkey_ec_validate_private(const EC_KEY *key)
- {
- BIGNUM *order = NULL, *tmp = NULL;
- int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
-
- if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
-
- /* log2(private) > log2(order)/2 */
- if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
- BN_num_bits(order) / 2)
- goto out;
-
- /* private < order - 1 */
- if (!BN_sub(tmp, order, BN_value_one())) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
- goto out;
- ret = 0;
- out:
- BN_clear_free(order);
- BN_clear_free(tmp);
- return ret;
- }
-
- void
- sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
- {
- BIGNUM *x = NULL, *y = NULL;
-
- if (point == NULL) {
- fputs("point=(NULL)\n", stderr);
- return;
- }
- if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) {
- fprintf(stderr, "%s: BN_new failed\n", __func__);
- goto out;
- }
- if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
- NID_X9_62_prime_field) {
- fprintf(stderr, "%s: group is not a prime field\n", __func__);
- goto out;
- }
- if (EC_POINT_get_affine_coordinates_GFp(group, point,
- x, y, NULL) != 1) {
- fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
- __func__);
- goto out;
- }
- fputs("x=", stderr);
- BN_print_fp(stderr, x);
- fputs("\ny=", stderr);
- BN_print_fp(stderr, y);
- fputs("\n", stderr);
- out:
- BN_clear_free(x);
- BN_clear_free(y);
- }
-
- void
- sshkey_dump_ec_key(const EC_KEY *key)
- {
- const BIGNUM *exponent;
-
- sshkey_dump_ec_point(EC_KEY_get0_group(key),
- EC_KEY_get0_public_key(key));
- fputs("exponent=", stderr);
- if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
- fputs("(NULL)", stderr);
- else
- BN_print_fp(stderr, EC_KEY_get0_private_key(key));
- fputs("\n", stderr);
- }
- #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
-
- static int
- sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob,
- const char *passphrase, const char *comment, const char *ciphername,
- int rounds)
- {
- u_char *cp, *key = NULL, *pubkeyblob = NULL;
- u_char salt[SALT_LEN];
- size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
- u_int check;
- int r = SSH_ERR_INTERNAL_ERROR;
- struct sshcipher_ctx *ciphercontext = NULL;
- const struct sshcipher *cipher;
- const char *kdfname = KDFNAME;
- struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
-
- if (rounds <= 0)
- rounds = DEFAULT_ROUNDS;
- if (passphrase == NULL || !strlen(passphrase)) {
- ciphername = "none";
- kdfname = "none";
- } else if (ciphername == NULL)
- ciphername = DEFAULT_CIPHERNAME;
- if ((cipher = cipher_by_name(ciphername)) == NULL) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
-
- if ((kdf = sshbuf_new()) == NULL ||
- (encoded = sshbuf_new()) == NULL ||
- (encrypted = sshbuf_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- blocksize = cipher_blocksize(cipher);
- keylen = cipher_keylen(cipher);
- ivlen = cipher_ivlen(cipher);
- authlen = cipher_authlen(cipher);
- if ((key = calloc(1, keylen + ivlen)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (strcmp(kdfname, "bcrypt") == 0) {
- arc4random_buf(salt, SALT_LEN);
- if (bcrypt_pbkdf(passphrase, strlen(passphrase),
- salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 ||
- (r = sshbuf_put_u32(kdf, rounds)) != 0)
- goto out;
- } else if (strcmp(kdfname, "none") != 0) {
- /* Unsupported KDF type */
- r = SSH_ERR_KEY_UNKNOWN_CIPHER;
- goto out;
- }
- if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
- key + keylen, ivlen, 1)) != 0)
- goto out;
-
- if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 ||
- (r = sshbuf_put_cstring(encoded, ciphername)) != 0 ||
- (r = sshbuf_put_cstring(encoded, kdfname)) != 0 ||
- (r = sshbuf_put_stringb(encoded, kdf)) != 0 ||
- (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */
- (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
- (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
- goto out;
-
- /* set up the buffer that will be encrypted */
-
- /* Random check bytes */
- check = arc4random();
- if ((r = sshbuf_put_u32(encrypted, check)) != 0 ||
- (r = sshbuf_put_u32(encrypted, check)) != 0)
- goto out;
-
- /* append private key and comment*/
- if ((r = sshkey_private_serialize_opt(prv, encrypted,
- SSHKEY_SERIALIZE_FULL)) != 0 ||
- (r = sshbuf_put_cstring(encrypted, comment)) != 0)
- goto out;
-
- /* padding */
- i = 0;
- while (sshbuf_len(encrypted) % blocksize) {
- if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
- goto out;
- }
-
- /* length in destination buffer */
- if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
- goto out;
-
- /* encrypt */
- if ((r = sshbuf_reserve(encoded,
- sshbuf_len(encrypted) + authlen, &cp)) != 0)
- goto out;
- if ((r = cipher_crypt(ciphercontext, 0, cp,
- sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
- goto out;
-
- sshbuf_reset(blob);
-
- /* assemble uuencoded key */
- if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 ||
- (r = sshbuf_dtob64(encoded, blob, 1)) != 0 ||
- (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0)
- goto out;
-
- /* success */
- r = 0;
-
- out:
- sshbuf_free(kdf);
- sshbuf_free(encoded);
- sshbuf_free(encrypted);
- cipher_free(ciphercontext);
- explicit_bzero(salt, sizeof(salt));
- if (key != NULL)
- freezero(key, keylen + ivlen);
- if (pubkeyblob != NULL)
- freezero(pubkeyblob, pubkeylen);
- return r;
- }
-
- static int
- private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp)
- {
- const u_char *cp;
- size_t encoded_len;
- int r;
- u_char last;
- struct sshbuf *encoded = NULL, *decoded = NULL;
-
- if (blob == NULL || decodedp == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
-
- *decodedp = NULL;
-
- if ((encoded = sshbuf_new()) == NULL ||
- (decoded = sshbuf_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
-
- /* check preamble */
- cp = sshbuf_ptr(blob);
- encoded_len = sshbuf_len(blob);
- if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) ||
- memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- cp += MARK_BEGIN_LEN;
- encoded_len -= MARK_BEGIN_LEN;
-
- /* Look for end marker, removing whitespace as we go */
- while (encoded_len > 0) {
- if (*cp != '\n' && *cp != '\r') {
- if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
- goto out;
- }
- last = *cp;
- encoded_len--;
- cp++;
- if (last == '\n') {
- if (encoded_len >= MARK_END_LEN &&
- memcmp(cp, MARK_END, MARK_END_LEN) == 0) {
- /* \0 terminate */
- if ((r = sshbuf_put_u8(encoded, 0)) != 0)
- goto out;
- break;
- }
- }
- }
- if (encoded_len == 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* decode base64 */
- if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
- goto out;
-
- /* check magic */
- if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) ||
- memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- /* success */
- *decodedp = decoded;
- decoded = NULL;
- r = 0;
- out:
- sshbuf_free(encoded);
- sshbuf_free(decoded);
- return r;
- }
-
- static int
- private2_decrypt(struct sshbuf *decoded, const char *passphrase,
- struct sshbuf **decryptedp, struct sshkey **pubkeyp)
- {
- char *ciphername = NULL, *kdfname = NULL;
- const struct sshcipher *cipher = NULL;
- int r = SSH_ERR_INTERNAL_ERROR;
- size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
- struct sshbuf *kdf = NULL, *decrypted = NULL;
- struct sshcipher_ctx *ciphercontext = NULL;
- struct sshkey *pubkey = NULL;
- u_char *key = NULL, *salt = NULL, *dp;
- u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
-
- if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
-
- *decryptedp = NULL;
- *pubkeyp = NULL;
-
- if ((decrypted = sshbuf_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
-
- /* parse public portion of key */
- if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
- (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 ||
- (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 ||
- (r = sshbuf_froms(decoded, &kdf)) != 0 ||
- (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
- goto out;
-
- if (nkeys != 1) {
- /* XXX only one key supported at present */
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- if ((r = sshkey_froms(decoded, &pubkey)) != 0 ||
- (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
- goto out;
-
- if ((cipher = cipher_by_name(ciphername)) == NULL) {
- r = SSH_ERR_KEY_UNKNOWN_CIPHER;
- goto out;
- }
- if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
- r = SSH_ERR_KEY_UNKNOWN_CIPHER;
- goto out;
- }
- if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- if ((passphrase == NULL || strlen(passphrase) == 0) &&
- strcmp(kdfname, "none") != 0) {
- /* passphrase required */
- r = SSH_ERR_KEY_WRONG_PASSPHRASE;
- goto out;
- }
-
- /* check size of encrypted key blob */
- blocksize = cipher_blocksize(cipher);
- if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* setup key */
- keylen = cipher_keylen(cipher);
- ivlen = cipher_ivlen(cipher);
- authlen = cipher_authlen(cipher);
- if ((key = calloc(1, keylen + ivlen)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (strcmp(kdfname, "bcrypt") == 0) {
- if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 ||
- (r = sshbuf_get_u32(kdf, &rounds)) != 0)
- goto out;
- if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
- key, keylen + ivlen, rounds) < 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- }
-
- /* check that an appropriate amount of auth data is present */
- if (sshbuf_len(decoded) < authlen ||
- sshbuf_len(decoded) - authlen < encrypted_len) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* decrypt private portion of key */
- if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 ||
- (r = cipher_init(&ciphercontext, cipher, key, keylen,
- key + keylen, ivlen, 0)) != 0)
- goto out;
- if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
- encrypted_len, 0, authlen)) != 0) {
- /* an integrity error here indicates an incorrect passphrase */
- if (r == SSH_ERR_MAC_INVALID)
- r = SSH_ERR_KEY_WRONG_PASSPHRASE;
- goto out;
- }
- if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
- goto out;
- /* there should be no trailing data */
- if (sshbuf_len(decoded) != 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* check check bytes */
- if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 ||
- (r = sshbuf_get_u32(decrypted, &check2)) != 0)
- goto out;
- if (check1 != check2) {
- r = SSH_ERR_KEY_WRONG_PASSPHRASE;
- goto out;
- }
- /* success */
- *decryptedp = decrypted;
- decrypted = NULL;
- *pubkeyp = pubkey;
- pubkey = NULL;
- r = 0;
- out:
- cipher_free(ciphercontext);
- free(ciphername);
- free(kdfname);
- sshkey_free(pubkey);
- if (salt != NULL) {
- explicit_bzero(salt, slen);
- free(salt);
- }
- if (key != NULL) {
- explicit_bzero(key, keylen + ivlen);
- free(key);
- }
- sshbuf_free(kdf);
- sshbuf_free(decrypted);
- return r;
- }
-
- static int
- sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
- struct sshkey **keyp, char **commentp)
- {
- char *comment = NULL;
- int r = SSH_ERR_INTERNAL_ERROR;
- struct sshbuf *decoded = NULL, *decrypted = NULL;
- struct sshkey *k = NULL, *pubkey = NULL;
-
- if (keyp != NULL)
- *keyp = NULL;
- if (commentp != NULL)
- *commentp = NULL;
-
- /* Undo base64 encoding and decrypt the private section */
- if ((r = private2_uudecode(blob, &decoded)) != 0 ||
- (r = private2_decrypt(decoded, passphrase,
- &decrypted, &pubkey)) != 0)
- goto out;
-
- if (type != KEY_UNSPEC &&
- sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
- r = SSH_ERR_KEY_TYPE_MISMATCH;
- goto out;
- }
-
- /* Load the private key and comment */
- if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 ||
- (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0)
- goto out;
-
- /* Check deterministic padding after private section */
- if ((r = private2_check_padding(decrypted)) != 0)
- goto out;
-
- /* Check that the public key in the envelope matches the private key */
- if (!sshkey_equal(pubkey, k)) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* success */
- r = 0;
- if (keyp != NULL) {
- *keyp = k;
- k = NULL;
- }
- if (commentp != NULL) {
- *commentp = comment;
- comment = NULL;
- }
- out:
- free(comment);
- sshbuf_free(decoded);
- sshbuf_free(decrypted);
- sshkey_free(k);
- sshkey_free(pubkey);
- return r;
- }
-
- static int
- sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
- struct sshkey **keyp)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
- struct sshbuf *decoded = NULL;
- struct sshkey *pubkey = NULL;
- u_int nkeys = 0;
-
- if (keyp != NULL)
- *keyp = NULL;
-
- if ((r = private2_uudecode(blob, &decoded)) != 0)
- goto out;
- /* parse public key from unencrypted envelope */
- if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 ||
- (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */
- (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */
- (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */
- (r = sshbuf_get_u32(decoded, &nkeys)) != 0)
- goto out;
-
- if (nkeys != 1) {
- /* XXX only one key supported at present */
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
-
- /* Parse the public key */
- if ((r = sshkey_froms(decoded, &pubkey)) != 0)
- goto out;
-
- if (type != KEY_UNSPEC &&
- sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
- r = SSH_ERR_KEY_TYPE_MISMATCH;
- goto out;
- }
-
- /* success */
- r = 0;
- if (keyp != NULL) {
- *keyp = pubkey;
- pubkey = NULL;
- }
- out:
- sshbuf_free(decoded);
- sshkey_free(pubkey);
- return r;
- }
-
- #ifdef WITH_OPENSSL
- /* convert SSH v2 key to PEM or PKCS#8 format */
- static int
- sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf,
- int format, const char *_passphrase, const char *comment)
- {
- int was_shielded = sshkey_is_shielded(key);
- int success, r;
- int blen, len = strlen(_passphrase);
- u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
- const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
- char *bptr;
- BIO *bio = NULL;
- struct sshbuf *blob;
- EVP_PKEY *pkey = NULL;
-
- if (len > 0 && len <= 4)
- return SSH_ERR_PASSPHRASE_TOO_SHORT;
- if ((blob = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((bio = BIO_new(BIO_s_mem())) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = sshkey_unshield_private(key)) != 0)
- goto out;
-
- switch (key->type) {
- #ifdef WITH_DSA
- case KEY_DSA:
- if (format == SSHKEY_PRIVATE_PEM) {
- success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
- cipher, passphrase, len, NULL, NULL);
- } else {
- success = EVP_PKEY_set1_DSA(pkey, key->dsa);
- }
- break;
- #endif
- #ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- if (format == SSHKEY_PRIVATE_PEM) {
- success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
- cipher, passphrase, len, NULL, NULL);
- } else {
- success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
- }
- break;
- #endif
- case KEY_RSA:
- if (format == SSHKEY_PRIVATE_PEM) {
- success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
- cipher, passphrase, len, NULL, NULL);
- } else {
- success = EVP_PKEY_set1_RSA(pkey, key->rsa);
- }
- break;
- default:
- success = 0;
- break;
- }
- if (success == 0) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (format == SSHKEY_PRIVATE_PKCS8) {
- if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
- passphrase, len, NULL, NULL)) == 0) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- }
- if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) {
- r = SSH_ERR_INTERNAL_ERROR;
- goto out;
- }
- if ((r = sshbuf_put(blob, bptr, blen)) != 0)
- goto out;
- r = 0;
- out:
- if (was_shielded)
- r = sshkey_shield_private(key);
- if (r == 0)
- r = sshbuf_putb(buf, blob);
-
- EVP_PKEY_free(pkey);
- sshbuf_free(blob);
- BIO_free(bio);
- return r;
- }
- #endif /* WITH_OPENSSL */
-
- /* Serialise "key" to buffer "blob" */
- int
- sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob,
- const char *passphrase, const char *comment,
- int format, const char *openssh_format_cipher, int openssh_format_rounds)
- {
- switch (key->type) {
- #ifdef WITH_OPENSSL
- case KEY_DSA:
- case KEY_ECDSA:
- case KEY_RSA:
- break; /* see below */
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_SK:
- #ifdef WITH_XMSS
- case KEY_XMSS:
- #endif /* WITH_XMSS */
- #ifdef WITH_OPENSSL
- case KEY_ECDSA_SK:
- #endif /* WITH_OPENSSL */
- return sshkey_private_to_blob2(key, blob, passphrase,
- comment, openssh_format_cipher, openssh_format_rounds);
- default:
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- }
-
- #ifdef WITH_OPENSSL
- switch (format) {
- case SSHKEY_PRIVATE_OPENSSH:
- return sshkey_private_to_blob2(key, blob, passphrase,
- comment, openssh_format_cipher, openssh_format_rounds);
- case SSHKEY_PRIVATE_PEM:
- case SSHKEY_PRIVATE_PKCS8:
- return sshkey_private_to_blob_pem_pkcs8(key, blob,
- format, passphrase, comment);
- default:
- return SSH_ERR_INVALID_ARGUMENT;
- }
- #endif /* WITH_OPENSSL */
- }
-
- #ifdef WITH_OPENSSL
- static int
- translate_libcrypto_error(unsigned long pem_err)
- {
- int pem_reason = ERR_GET_REASON(pem_err);
-
- switch (ERR_GET_LIB(pem_err)) {
- case ERR_LIB_PEM:
- switch (pem_reason) {
- case PEM_R_BAD_PASSWORD_READ:
- #ifdef PEM_R_PROBLEMS_GETTING_PASSWORD
- case PEM_R_PROBLEMS_GETTING_PASSWORD:
- #endif
- #ifdef PEM_R_BAD_DECRYPT
- case PEM_R_BAD_DECRYPT:
- #endif
- return SSH_ERR_KEY_WRONG_PASSPHRASE;
- default:
- return SSH_ERR_INVALID_FORMAT;
- }
- case ERR_LIB_EVP:
- switch (pem_reason) {
- #ifdef EVP_R_BAD_DECRYPT
- case EVP_R_BAD_DECRYPT:
- return SSH_ERR_KEY_WRONG_PASSPHRASE;
- #endif
- #ifdef EVP_R_BN_DECODE_ERROR
- case EVP_R_BN_DECODE_ERROR:
- #endif
- case EVP_R_DECODE_ERROR:
- #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR
- case EVP_R_PRIVATE_KEY_DECODE_ERROR:
- #endif
- return SSH_ERR_INVALID_FORMAT;
- default:
- return SSH_ERR_LIBCRYPTO_ERROR;
- }
- case ERR_LIB_ASN1:
- return SSH_ERR_INVALID_FORMAT;
- }
- return SSH_ERR_LIBCRYPTO_ERROR;
- }
-
- static void
- clear_libcrypto_errors(void)
- {
- while (ERR_get_error() != 0)
- ;
- }
-
- /*
- * Translate OpenSSL error codes to determine whether
- * passphrase is required/incorrect.
- */
- static int
- convert_libcrypto_error(void)
- {
- /*
- * Some password errors are reported at the beginning
- * of the error queue.
- */
- if (translate_libcrypto_error(ERR_peek_error()) ==
- SSH_ERR_KEY_WRONG_PASSPHRASE)
- return SSH_ERR_KEY_WRONG_PASSPHRASE;
- return translate_libcrypto_error(ERR_peek_last_error());
- }
-
- static int
- pem_passphrase_cb(char *buf, int size, int rwflag, void *u)
- {
- char *p = (char *)u;
- size_t len;
-
- if (p == NULL || (len = strlen(p)) == 0)
- return -1;
- if (size < 0 || len > (size_t)size)
- return -1;
- memcpy(buf, p, len);
- return (int)len;
- }
-
- static int
- sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
- const char *passphrase, struct sshkey **keyp)
- {
- EVP_PKEY *pk = NULL;
- struct sshkey *prv = NULL;
- BIO *bio = NULL;
- int r;
-
- if (keyp != NULL)
- *keyp = NULL;
-
- if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX)
- return SSH_ERR_ALLOC_FAIL;
- if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
- (int)sshbuf_len(blob)) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
-
- clear_libcrypto_errors();
- if ((pk = PEM_read_bio_PrivateKey(bio, NULL, pem_passphrase_cb,
- (char *)passphrase)) == NULL) {
- /*
- * libcrypto may return various ASN.1 errors when attempting
- * to parse a key with an incorrect passphrase.
- * Treat all format errors as "incorrect passphrase" if a
- * passphrase was supplied.
- */
- if (passphrase != NULL && *passphrase != '\0')
- r = SSH_ERR_KEY_WRONG_PASSPHRASE;
- else
- r = convert_libcrypto_error();
- goto out;
- }
- if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA &&
- (type == KEY_UNSPEC || type == KEY_RSA)) {
- if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- prv->rsa = EVP_PKEY_get1_RSA(pk);
- prv->type = KEY_RSA;
- #ifdef DEBUG_PK
- RSA_print_fp(stderr, prv->rsa, 8);
- #endif
- if (RSA_blinding_on(prv->rsa, NULL) != 1) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
- goto out;
- #ifdef WITH_DSA
- } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA &&
- (type == KEY_UNSPEC || type == KEY_DSA)) {
- if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- prv->dsa = EVP_PKEY_get1_DSA(pk);
- prv->type = KEY_DSA;
- #ifdef DEBUG_PK
- DSA_print_fp(stderr, prv->dsa, 8);
- #endif
- #endif
- #ifdef OPENSSL_HAS_ECC
- } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC &&
- (type == KEY_UNSPEC || type == KEY_ECDSA)) {
- if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
- prv->type = KEY_ECDSA;
- prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
- if (prv->ecdsa_nid == -1 ||
- sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
- sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
- EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
- sshkey_ec_validate_private(prv->ecdsa) != 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- # ifdef DEBUG_PK
- if (prv != NULL && prv->ecdsa != NULL)
- sshkey_dump_ec_key(prv->ecdsa);
- # endif
- #endif /* OPENSSL_HAS_ECC */
- #ifdef OPENSSL_HAS_ED25519
- } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_ED25519 &&
- (type == KEY_UNSPEC || type == KEY_ED25519)) {
- size_t len;
-
- if ((prv = sshkey_new(KEY_UNSPEC)) == NULL ||
- (prv->ed25519_sk = calloc(1, ED25519_SK_SZ)) == NULL ||
- (prv->ed25519_pk = calloc(1, ED25519_PK_SZ)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- prv->type = KEY_ED25519;
- len = ED25519_PK_SZ;
- if (!EVP_PKEY_get_raw_public_key(pk, prv->ed25519_pk, &len)) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (len != ED25519_PK_SZ) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- len = ED25519_SK_SZ - ED25519_PK_SZ;
- if (!EVP_PKEY_get_raw_private_key(pk, prv->ed25519_sk, &len)) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if (len != ED25519_SK_SZ - ED25519_PK_SZ) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- /* Append the public key to our private key */
- memcpy(prv->ed25519_sk + (ED25519_SK_SZ - ED25519_PK_SZ),
- prv->ed25519_pk, ED25519_PK_SZ);
- # ifdef DEBUG_PK
- sshbuf_dump_data(prv->ed25519_sk, ED25519_SK_SZ, stderr);
- # endif
- #endif /* OPENSSL_HAS_ED25519 */
- } else {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- r = 0;
- if (keyp != NULL) {
- *keyp = prv;
- prv = NULL;
- }
- out:
- BIO_free(bio);
- EVP_PKEY_free(pk);
- sshkey_free(prv);
- return r;
- }
- #endif /* WITH_OPENSSL */
-
- int
- sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
- const char *passphrase, struct sshkey **keyp, char **commentp)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
-
- if (keyp != NULL)
- *keyp = NULL;
- if (commentp != NULL)
- *commentp = NULL;
-
- switch (type) {
- case KEY_XMSS:
- /* No fallback for new-format-only keys */
- return sshkey_parse_private2(blob, type, passphrase,
- keyp, commentp);
- default:
- r = sshkey_parse_private2(blob, type, passphrase, keyp,
- commentp);
- /* Only fallback to PEM parser if a format error occurred. */
- if (r != SSH_ERR_INVALID_FORMAT)
- return r;
- #ifdef WITH_OPENSSL
- return sshkey_parse_private_pem_fileblob(blob, type,
- passphrase, keyp);
- #else
- return SSH_ERR_INVALID_FORMAT;
- #endif /* WITH_OPENSSL */
- }
- }
-
- int
- sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase,
- struct sshkey **keyp, char **commentp)
- {
- if (keyp != NULL)
- *keyp = NULL;
- if (commentp != NULL)
- *commentp = NULL;
-
- return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
- passphrase, keyp, commentp);
- }
-
- void
- sshkey_sig_details_free(struct sshkey_sig_details *details)
- {
- freezero(details, sizeof(*details));
- }
-
- int
- sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
- struct sshkey **pubkeyp)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
-
- if (pubkeyp != NULL)
- *pubkeyp = NULL;
- /* only new-format private keys bundle a public key inside */
- if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
- return r;
- return 0;
- }
-
- #ifdef WITH_XMSS
- /*
- * serialize the key with the current state and forward the state
- * maxsign times.
- */
- int
- sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
- u_int32_t maxsign, int printerror)
- {
- int r, rupdate;
-
- if (maxsign == 0 ||
- sshkey_type_plain(k->type) != KEY_XMSS)
- return sshkey_private_serialize_opt(k, b,
- SSHKEY_SERIALIZE_DEFAULT);
- if ((r = sshkey_xmss_get_state(k, printerror)) != 0 ||
- (r = sshkey_private_serialize_opt(k, b,
- SSHKEY_SERIALIZE_STATE)) != 0 ||
- (r = sshkey_xmss_forward_state(k, maxsign)) != 0)
- goto out;
- r = 0;
- out:
- if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
- if (r == 0)
- r = rupdate;
- }
- return r;
- }
-
- u_int32_t
- sshkey_signatures_left(const struct sshkey *k)
- {
- if (sshkey_type_plain(k->type) == KEY_XMSS)
- return sshkey_xmss_signatures_left(k);
- return 0;
- }
-
- int
- sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
- {
- if (sshkey_type_plain(k->type) != KEY_XMSS)
- return SSH_ERR_INVALID_ARGUMENT;
- return sshkey_xmss_enable_maxsign(k, maxsign);
- }
-
- int
- sshkey_set_filename(struct sshkey *k, const char *filename)
- {
- if (k == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if (sshkey_type_plain(k->type) != KEY_XMSS)
- return 0;
- if (filename == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((k->xmss_filename = strdup(filename)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- return 0;
- }
- #else
- int
- sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b,
- u_int32_t maxsign, int printerror)
- {
- return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
- }
-
- u_int32_t
- sshkey_signatures_left(const struct sshkey *k)
- {
- return 0;
- }
-
- int
- sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
- {
- return SSH_ERR_INVALID_ARGUMENT;
- }
-
- int
- sshkey_set_filename(struct sshkey *k, const char *filename)
- {
- if (k == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- return 0;
- }
- #endif /* WITH_XMSS */
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