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- /* $OpenBSD: sshkey.c,v 1.41 2016/10/24 01:09:17 dtucker 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 <string.h>
- #include <resolv.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 "rsa.h"
- #include "cipher.h"
- #include "digest.h"
- #define SSHKEY_INTERNAL
- #include "sshkey.h"
- #include "match.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-cbc"
- #define DEFAULT_ROUNDS 16
- /* Version identification string for SSH v1 identity files. */
- #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n"
- static int sshkey_from_blob_internal(struct sshbuf *buf,
- struct sshkey **keyp, int allow_cert);
- /* Supported key types */
- struct keytype {
- const char *name;
- const char *shortname;
- int type;
- int nid;
- int cert;
- int sigonly;
- };
- static const struct keytype keytypes[] = {
- { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0, 0 },
- { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
- KEY_ED25519_CERT, 0, 1, 0 },
- #ifdef WITH_OPENSSL
- { NULL, "RSA1", KEY_RSA1, 0, 0, 0 },
- { "ssh-rsa", "RSA", KEY_RSA, 0, 0, 0 },
- { "rsa-sha2-256", "RSA", KEY_RSA, 0, 0, 1 },
- { "rsa-sha2-512", "RSA", KEY_RSA, 0, 0, 1 },
- { "ssh-dss", "DSA", KEY_DSA, 0, 0, 0 },
- # ifdef OPENSSL_HAS_ECC
- { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 },
- { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0, 0 },
- # ifdef OPENSSL_HAS_NISTP521
- { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0, 0 },
- # endif /* OPENSSL_HAS_NISTP521 */
- # endif /* OPENSSL_HAS_ECC */
- { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1, 0 },
- { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1, 0 },
- # ifdef OPENSSL_HAS_ECC
- { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
- KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 },
- { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
- KEY_ECDSA_CERT, NID_secp384r1, 1, 0 },
- # ifdef OPENSSL_HAS_NISTP521
- { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
- KEY_ECDSA_CERT, NID_secp521r1, 1, 0 },
- # endif /* OPENSSL_HAS_NISTP521 */
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
- { NULL, NULL, -1, -1, 0, 0 }
- };
- const char *
- sshkey_type(const struct sshkey *k)
- {
- const struct keytype *kt;
- for (kt = keytypes; kt->type != -1; kt++) {
- if (kt->type == k->type)
- return kt->shortname;
- }
- return "unknown";
- }
- static const char *
- sshkey_ssh_name_from_type_nid(int type, int nid)
- {
- const struct keytype *kt;
- for (kt = keytypes; kt->type != -1; kt++) {
- if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
- return kt->name;
- }
- return "ssh-unknown";
- }
- int
- sshkey_type_is_cert(int type)
- {
- const struct keytype *kt;
- for (kt = keytypes; kt->type != -1; kt++) {
- if (kt->type == type)
- return kt->cert;
- }
- return 0;
- }
- 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)
- {
- const struct keytype *kt;
- for (kt = keytypes; kt->type != -1; kt++) {
- /* Only allow shortname matches for plain key types */
- if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
- (!kt->cert && strcasecmp(kt->shortname, name) == 0))
- return kt->type;
- }
- return KEY_UNSPEC;
- }
- int
- sshkey_ecdsa_nid_from_name(const char *name)
- {
- const struct keytype *kt;
- for (kt = keytypes; kt->type != -1; kt++) {
- if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
- continue;
- if (kt->name != NULL && strcmp(name, kt->name) == 0)
- return kt->nid;
- }
- return -1;
- }
- char *
- sshkey_alg_list(int certs_only, int plain_only, char sep)
- {
- char *tmp, *ret = NULL;
- size_t nlen, rlen = 0;
- const struct keytype *kt;
- for (kt = keytypes; kt->type != -1; kt++) {
- if (kt->name == NULL || kt->sigonly)
- continue;
- if ((certs_only && !kt->cert) || (plain_only && kt->cert))
- continue;
- if (ret != NULL)
- ret[rlen++] = sep;
- nlen = strlen(kt->name);
- if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
- free(ret);
- return NULL;
- }
- ret = tmp;
- memcpy(ret + rlen, kt->name, nlen + 1);
- rlen += nlen;
- }
- return ret;
- }
- int
- sshkey_names_valid2(const char *names, int allow_wildcard)
- {
- char *s, *cp, *p;
- const struct keytype *kt;
- int 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_RSA1) {
- free(s);
- return 0;
- }
- 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.
- */
- for (kt = keytypes; kt->type != -1; kt++) {
- if (kt->type == KEY_RSA1)
- continue;
- if (match_pattern_list(kt->name,
- p, 0) != 0)
- break;
- }
- if (kt->type != -1)
- continue;
- }
- free(s);
- return 0;
- }
- }
- free(s);
- return 1;
- }
- u_int
- sshkey_size(const struct sshkey *k)
- {
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA1:
- case KEY_RSA:
- case KEY_RSA_CERT:
- return BN_num_bits(k->rsa->n);
- case KEY_DSA:
- case KEY_DSA_CERT:
- return BN_num_bits(k->dsa->p);
- case KEY_ECDSA:
- case KEY_ECDSA_CERT:
- return sshkey_curve_nid_to_bits(k->ecdsa_nid);
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- return 256; /* XXX */
- }
- return 0;
- }
- static int
- sshkey_type_is_valid_ca(int type)
- {
- switch (type) {
- case KEY_RSA:
- case KEY_DSA:
- case KEY_ECDSA:
- case KEY_ED25519:
- return 1;
- default:
- return 0;
- }
- }
- int
- sshkey_is_cert(const struct sshkey *k)
- {
- if (k == NULL)
- return 0;
- return sshkey_type_is_cert(k->type);
- }
- /* 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_ED25519_CERT:
- return KEY_ED25519;
- default:
- return type;
- }
- }
- #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);
- explicit_bzero(cert, sizeof(*cert));
- free(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;
- return cert;
- }
- struct sshkey *
- sshkey_new(int type)
- {
- struct sshkey *k;
- #ifdef WITH_OPENSSL
- RSA *rsa;
- DSA *dsa;
- #endif /* WITH_OPENSSL */
- if ((k = calloc(1, sizeof(*k))) == NULL)
- return NULL;
- k->type = type;
- k->ecdsa = NULL;
- k->ecdsa_nid = -1;
- k->dsa = NULL;
- k->rsa = NULL;
- k->cert = NULL;
- k->ed25519_sk = NULL;
- k->ed25519_pk = NULL;
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA1:
- case KEY_RSA:
- case KEY_RSA_CERT:
- if ((rsa = RSA_new()) == NULL ||
- (rsa->n = BN_new()) == NULL ||
- (rsa->e = BN_new()) == NULL) {
- if (rsa != NULL)
- RSA_free(rsa);
- free(k);
- return NULL;
- }
- k->rsa = rsa;
- break;
- case KEY_DSA:
- case KEY_DSA_CERT:
- if ((dsa = DSA_new()) == NULL ||
- (dsa->p = BN_new()) == NULL ||
- (dsa->q = BN_new()) == NULL ||
- (dsa->g = BN_new()) == NULL ||
- (dsa->pub_key = BN_new()) == NULL) {
- if (dsa != NULL)
- DSA_free(dsa);
- free(k);
- return NULL;
- }
- k->dsa = dsa;
- break;
- case KEY_ECDSA:
- case KEY_ECDSA_CERT:
- /* Cannot do anything until we know the group */
- break;
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- /* no need to prealloc */
- break;
- case KEY_UNSPEC:
- break;
- default:
- free(k);
- return NULL;
- }
- if (sshkey_is_cert(k)) {
- if ((k->cert = cert_new()) == NULL) {
- sshkey_free(k);
- return NULL;
- }
- }
- return k;
- }
- int
- sshkey_add_private(struct sshkey *k)
- {
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA1:
- case KEY_RSA:
- case KEY_RSA_CERT:
- #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL)
- if (bn_maybe_alloc_failed(k->rsa->d) ||
- bn_maybe_alloc_failed(k->rsa->iqmp) ||
- bn_maybe_alloc_failed(k->rsa->q) ||
- bn_maybe_alloc_failed(k->rsa->p) ||
- bn_maybe_alloc_failed(k->rsa->dmq1) ||
- bn_maybe_alloc_failed(k->rsa->dmp1))
- return SSH_ERR_ALLOC_FAIL;
- break;
- case KEY_DSA:
- case KEY_DSA_CERT:
- if (bn_maybe_alloc_failed(k->dsa->priv_key))
- return SSH_ERR_ALLOC_FAIL;
- break;
- #undef bn_maybe_alloc_failed
- case KEY_ECDSA:
- case KEY_ECDSA_CERT:
- /* Cannot do anything until we know the group */
- break;
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- /* no need to prealloc */
- break;
- case KEY_UNSPEC:
- break;
- default:
- return SSH_ERR_INVALID_ARGUMENT;
- }
- return 0;
- }
- struct sshkey *
- sshkey_new_private(int type)
- {
- struct sshkey *k = sshkey_new(type);
- if (k == NULL)
- return NULL;
- if (sshkey_add_private(k) != 0) {
- sshkey_free(k);
- return NULL;
- }
- return k;
- }
- void
- sshkey_free(struct sshkey *k)
- {
- if (k == NULL)
- return;
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA1:
- case KEY_RSA:
- case KEY_RSA_CERT:
- if (k->rsa != NULL)
- RSA_free(k->rsa);
- k->rsa = NULL;
- break;
- case KEY_DSA:
- case KEY_DSA_CERT:
- if (k->dsa != NULL)
- DSA_free(k->dsa);
- k->dsa = NULL;
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- case KEY_ECDSA_CERT:
- if (k->ecdsa != NULL)
- EC_KEY_free(k->ecdsa);
- k->ecdsa = NULL;
- break;
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- if (k->ed25519_pk) {
- explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
- free(k->ed25519_pk);
- k->ed25519_pk = NULL;
- }
- if (k->ed25519_sk) {
- explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
- free(k->ed25519_sk);
- k->ed25519_sk = NULL;
- }
- break;
- case KEY_UNSPEC:
- break;
- default:
- break;
- }
- if (sshkey_is_cert(k))
- cert_free(k->cert);
- explicit_bzero(k, sizeof(*k));
- free(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;
- }
- /*
- * 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)
- {
- #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
- BN_CTX *bnctx;
- #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
- if (a == NULL || b == NULL ||
- sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
- return 0;
- switch (a->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA1:
- case KEY_RSA_CERT:
- case KEY_RSA:
- return a->rsa != NULL && b->rsa != NULL &&
- BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
- BN_cmp(a->rsa->n, b->rsa->n) == 0;
- case KEY_DSA_CERT:
- case KEY_DSA:
- return a->dsa != NULL && b->dsa != NULL &&
- BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
- BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
- BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
- BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA_CERT:
- case KEY_ECDSA:
- if (a->ecdsa == NULL || b->ecdsa == NULL ||
- EC_KEY_get0_public_key(a->ecdsa) == NULL ||
- EC_KEY_get0_public_key(b->ecdsa) == NULL)
- return 0;
- if ((bnctx = BN_CTX_new()) == NULL)
- return 0;
- if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
- EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
- EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
- EC_KEY_get0_public_key(a->ecdsa),
- EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
- BN_CTX_free(bnctx);
- return 0;
- }
- BN_CTX_free(bnctx);
- return 1;
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
- memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
- default:
- return 0;
- }
- /* NOTREACHED */
- }
- 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);
- }
- static int
- to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain)
- {
- int type, ret = SSH_ERR_INTERNAL_ERROR;
- const char *typename;
- if (key == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if (sshkey_is_cert(key)) {
- if (key->cert == NULL)
- return SSH_ERR_EXPECTED_CERT;
- if (sshbuf_len(key->cert->certblob) == 0)
- return SSH_ERR_KEY_LACKS_CERTBLOB;
- }
- type = force_plain ? sshkey_type_plain(key->type) : key->type;
- typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
- switch (type) {
- #ifdef WITH_OPENSSL
- case KEY_DSA_CERT:
- case KEY_ECDSA_CERT:
- case KEY_RSA_CERT:
- #endif /* WITH_OPENSSL */
- case KEY_ED25519_CERT:
- /* Use the existing blob */
- /* XXX modified flag? */
- if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
- return ret;
- break;
- #ifdef WITH_OPENSSL
- case KEY_DSA:
- if (key->dsa == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
- (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
- (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
- (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
- (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0)
- return ret;
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- if (key->ecdsa == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
- (ret = sshbuf_put_cstring(b,
- sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
- (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0)
- return ret;
- break;
- # endif
- case KEY_RSA:
- if (key->rsa == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
- (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
- (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0)
- return ret;
- break;
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- if (key->ed25519_pk == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((ret = sshbuf_put_cstring(b, typename)) != 0 ||
- (ret = sshbuf_put_string(b,
- key->ed25519_pk, ED25519_PK_SZ)) != 0)
- return ret;
- break;
- default:
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- }
- return 0;
- }
- int
- sshkey_putb(const struct sshkey *key, struct sshbuf *b)
- {
- return to_blob_buf(key, b, 0);
- }
- int
- sshkey_puts(const struct sshkey *key, struct sshbuf *b)
- {
- struct sshbuf *tmp;
- int r;
- if ((tmp = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- r = to_blob_buf(key, tmp, 0);
- if (r == 0)
- r = sshbuf_put_stringb(b, tmp);
- sshbuf_free(tmp);
- return r;
- }
- int
- sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b)
- {
- return to_blob_buf(key, b, 1);
- }
- static int
- to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain)
- {
- 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)) != 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);
- }
- int
- sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp)
- {
- return to_blob(key, blobp, lenp, 1);
- }
- 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 (k->type == KEY_RSA1) {
- #ifdef WITH_OPENSSL
- int nlen = BN_num_bytes(k->rsa->n);
- int elen = BN_num_bytes(k->rsa->e);
- if (nlen < 0 || elen < 0 || nlen >= INT_MAX - elen) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- blob_len = nlen + elen;
- if ((blob = malloc(blob_len)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- BN_bn2bin(k->rsa->n, blob);
- BN_bn2bin(k->rsa->e, blob + nlen);
- #endif /* WITH_OPENSSL */
- } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 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) {
- explicit_bzero(blob, blob_len);
- free(blob);
- }
- 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;
- int r;
- 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 ((r = b64_ntop(dgst_raw, dgst_raw_len,
- ret + plen, rlen - plen)) == -1) {
- explicit_bzero(ret, rlen);
- free(ret);
- 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:
- explicit_bzero(dgst_raw, dgst_raw_len);
- free(dgst_raw);
- return NULL;
- }
- explicit_bzero(dgst_raw, dgst_raw_len);
- free(dgst_raw);
- return retval;
- }
- #ifdef WITH_SSH1
- /*
- * Reads a multiple-precision integer in decimal from the buffer, and advances
- * the pointer. The integer must already be initialized. This function is
- * permitted to modify the buffer. This leaves *cpp to point just beyond the
- * last processed character.
- */
- static int
- read_decimal_bignum(char **cpp, BIGNUM *v)
- {
- char *cp;
- size_t e;
- int skip = 1; /* skip white space */
- cp = *cpp;
- while (*cp == ' ' || *cp == '\t')
- cp++;
- e = strspn(cp, "0123456789");
- if (e == 0)
- return SSH_ERR_INVALID_FORMAT;
- if (e > SSHBUF_MAX_BIGNUM * 3)
- return SSH_ERR_BIGNUM_TOO_LARGE;
- if (cp[e] == '\0')
- skip = 0;
- else if (strchr(" \t\r\n", cp[e]) == NULL)
- return SSH_ERR_INVALID_FORMAT;
- cp[e] = '\0';
- if (BN_dec2bn(&v, cp) <= 0)
- return SSH_ERR_INVALID_FORMAT;
- *cpp = cp + e + skip;
- return 0;
- }
- #endif /* WITH_SSH1 */
- /* returns 0 ok, and < 0 error */
- int
- sshkey_read(struct sshkey *ret, char **cpp)
- {
- struct sshkey *k;
- int retval = SSH_ERR_INVALID_FORMAT;
- char *ep, *cp, *space;
- int r, type, curve_nid = -1;
- struct sshbuf *blob;
- #ifdef WITH_SSH1
- u_long bits;
- #endif /* WITH_SSH1 */
- cp = *cpp;
- switch (ret->type) {
- case KEY_RSA1:
- #ifdef WITH_SSH1
- /* Get number of bits. */
- bits = strtoul(cp, &ep, 10);
- if (*cp == '\0' || strchr(" \t\r\n", *ep) == NULL ||
- bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8)
- return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */
- /* Get public exponent, public modulus. */
- if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0)
- return r;
- if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0)
- return r;
- /* validate the claimed number of bits */
- if (BN_num_bits(ret->rsa->n) != (int)bits)
- return SSH_ERR_KEY_BITS_MISMATCH;
- *cpp = ep;
- retval = 0;
- #endif /* WITH_SSH1 */
- break;
- case KEY_UNSPEC:
- case KEY_RSA:
- case KEY_DSA:
- case KEY_ECDSA:
- case KEY_ED25519:
- case KEY_DSA_CERT:
- case KEY_ECDSA_CERT:
- case KEY_RSA_CERT:
- case KEY_ED25519_CERT:
- space = strchr(cp, ' ');
- if (space == NULL)
- return SSH_ERR_INVALID_FORMAT;
- *space = '\0';
- type = sshkey_type_from_name(cp);
- if (sshkey_type_plain(type) == KEY_ECDSA &&
- (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1)
- return SSH_ERR_EC_CURVE_INVALID;
- *space = ' ';
- if (type == KEY_UNSPEC)
- return SSH_ERR_INVALID_FORMAT;
- cp = space+1;
- 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;
- /* trim comment */
- space = strchr(cp, ' ');
- if (space) {
- /* advance 'space': skip whitespace */
- *space++ = '\0';
- while (*space == ' ' || *space == '\t')
- space++;
- ep = space;
- } else
- ep = cp + strlen(cp);
- if ((r = sshbuf_b64tod(blob, cp)) != 0) {
- sshbuf_free(blob);
- return r;
- }
- if ((r = sshkey_from_blob(sshbuf_ptr(blob),
- sshbuf_len(blob), &k)) != 0) {
- sshbuf_free(blob);
- return r;
- }
- sshbuf_free(blob);
- if (k->type != type) {
- sshkey_free(k);
- return SSH_ERR_KEY_TYPE_MISMATCH;
- }
- if (sshkey_type_plain(type) == KEY_ECDSA &&
- curve_nid != k->ecdsa_nid) {
- sshkey_free(k);
- return SSH_ERR_EC_CURVE_MISMATCH;
- }
- ret->type = type;
- if (sshkey_is_cert(ret)) {
- if (!sshkey_is_cert(k)) {
- sshkey_free(k);
- return SSH_ERR_EXPECTED_CERT;
- }
- if (ret->cert != NULL)
- cert_free(ret->cert);
- ret->cert = k->cert;
- k->cert = NULL;
- }
- switch (sshkey_type_plain(ret->type)) {
- #ifdef WITH_OPENSSL
- case KEY_RSA:
- if (ret->rsa != NULL)
- RSA_free(ret->rsa);
- ret->rsa = k->rsa;
- k->rsa = NULL;
- #ifdef DEBUG_PK
- RSA_print_fp(stderr, ret->rsa, 8);
- #endif
- break;
- case KEY_DSA:
- if (ret->dsa != NULL)
- DSA_free(ret->dsa);
- ret->dsa = k->dsa;
- k->dsa = NULL;
- #ifdef DEBUG_PK
- DSA_print_fp(stderr, ret->dsa, 8);
- #endif
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- if (ret->ecdsa != NULL)
- EC_KEY_free(ret->ecdsa);
- ret->ecdsa = k->ecdsa;
- ret->ecdsa_nid = k->ecdsa_nid;
- k->ecdsa = NULL;
- k->ecdsa_nid = -1;
- #ifdef DEBUG_PK
- sshkey_dump_ec_key(ret->ecdsa);
- #endif
- break;
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- free(ret->ed25519_pk);
- ret->ed25519_pk = k->ed25519_pk;
- k->ed25519_pk = NULL;
- #ifdef DEBUG_PK
- /* XXX */
- #endif
- break;
- }
- *cpp = ep;
- retval = 0;
- /*XXXX*/
- sshkey_free(k);
- if (retval != 0)
- break;
- break;
- default:
- return SSH_ERR_INVALID_ARGUMENT;
- }
- return retval;
- }
- 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(b)) == 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;
- }
- static int
- sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
- #ifdef WITH_SSH1
- u_int bits = 0;
- char *dec_e = NULL, *dec_n = NULL;
- if (key->rsa == NULL || key->rsa->e == NULL ||
- key->rsa->n == NULL) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
- (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- /* size of modulus 'n' */
- if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
- goto out;
- /* Success */
- r = 0;
- out:
- if (dec_e != NULL)
- OPENSSL_free(dec_e);
- if (dec_n != NULL)
- OPENSSL_free(dec_n);
- #endif /* WITH_SSH1 */
- return r;
- }
- static int
- sshkey_format_text(const struct sshkey *key, struct sshbuf *b)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
- char *uu = NULL;
- if (key->type == KEY_RSA1) {
- if ((r = sshkey_format_rsa1(key, b)) != 0)
- goto out;
- } else {
- /* Unsupported key types handled in sshkey_to_base64() */
- 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";
- }
- }
- #ifdef WITH_OPENSSL
- static int
- rsa_generate_private_key(u_int bits, RSA **rsap)
- {
- RSA *private = NULL;
- BIGNUM *f4 = NULL;
- int ret = SSH_ERR_INTERNAL_ERROR;
- if (rsap == NULL ||
- bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
- bits > SSHBUF_MAX_BIGNUM * 8)
- return SSH_ERR_INVALID_ARGUMENT;
- *rsap = NULL;
- if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (!BN_set_word(f4, RSA_F4) ||
- !RSA_generate_key_ex(private, bits, f4, NULL)) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- *rsap = private;
- private = NULL;
- ret = 0;
- out:
- if (private != NULL)
- RSA_free(private);
- if (f4 != NULL)
- BN_free(f4);
- return ret;
- }
- static int
- dsa_generate_private_key(u_int bits, DSA **dsap)
- {
- DSA *private;
- int ret = SSH_ERR_INTERNAL_ERROR;
- if (dsap == NULL || bits != 1024)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((private = DSA_new()) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- *dsap = NULL;
- if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
- NULL, NULL) || !DSA_generate_key(private)) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- *dsap = private;
- private = NULL;
- ret = 0;
- out:
- if (private != NULL)
- DSA_free(private);
- return ret;
- }
- # 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;
- BN_CTX *bnctx;
- 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;
- if ((bnctx = BN_CTX_new()) == NULL)
- return -1;
- for (i = 0; nids[i] != -1; i++) {
- if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) {
- BN_CTX_free(bnctx);
- return -1;
- }
- if (EC_GROUP_cmp(g, eg, bnctx) == 0)
- break;
- EC_GROUP_free(eg);
- }
- BN_CTX_free(bnctx);
- 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];
- }
- static int
- ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap)
- {
- EC_KEY *private;
- int ret = SSH_ERR_INTERNAL_ERROR;
- if (nid == NULL || ecdsap == NULL ||
- (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1)
- return SSH_ERR_INVALID_ARGUMENT;
- *ecdsap = NULL;
- if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (EC_KEY_generate_key(private) != 1) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
- *ecdsap = private;
- private = NULL;
- ret = 0;
- out:
- if (private != NULL)
- EC_KEY_free(private);
- return ret;
- }
- # 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;
- if (keyp == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- *keyp = NULL;
- if ((k = sshkey_new(KEY_UNSPEC)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- switch (type) {
- case KEY_ED25519:
- if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
- (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- break;
- }
- crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
- ret = 0;
- break;
- #ifdef WITH_OPENSSL
- case KEY_DSA:
- ret = dsa_generate_private_key(bits, &k->dsa);
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid,
- &k->ecdsa);
- break;
- # endif /* OPENSSL_HAS_ECC */
- case KEY_RSA:
- case KEY_RSA1:
- ret = rsa_generate_private_key(bits, &k->rsa);
- break;
- #endif /* WITH_OPENSSL */
- default:
- ret = SSH_ERR_INVALID_ARGUMENT;
- }
- if (ret == 0) {
- k->type = type;
- *keyp = k;
- } else
- sshkey_free(k);
- return ret;
- }
- 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 ret = SSH_ERR_INTERNAL_ERROR;
- if (to_key->cert != NULL) {
- cert_free(to_key->cert);
- to_key->cert = NULL;
- }
- if ((from = from_key->cert) == NULL)
- return SSH_ERR_INVALID_ARGUMENT;
- if ((to = to_key->cert = cert_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 ||
- (ret = sshbuf_putb(to->critical, from->critical)) != 0 ||
- (ret = sshbuf_putb(to->extensions, from->extensions)) != 0)
- return ret;
- 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)
- return SSH_ERR_ALLOC_FAIL;
- to->valid_after = from->valid_after;
- to->valid_before = from->valid_before;
- if (from->signature_key == NULL)
- to->signature_key = NULL;
- else if ((ret = sshkey_from_private(from->signature_key,
- &to->signature_key)) != 0)
- return ret;
- if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS)
- return SSH_ERR_INVALID_ARGUMENT;
- if (from->nprincipals > 0) {
- if ((to->principals = calloc(from->nprincipals,
- sizeof(*to->principals))) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- for (i = 0; i < from->nprincipals; i++) {
- to->principals[i] = strdup(from->principals[i]);
- if (to->principals[i] == NULL) {
- to->nprincipals = i;
- return SSH_ERR_ALLOC_FAIL;
- }
- }
- }
- to->nprincipals = from->nprincipals;
- return 0;
- }
- int
- sshkey_from_private(const struct sshkey *k, struct sshkey **pkp)
- {
- struct sshkey *n = NULL;
- int ret = SSH_ERR_INTERNAL_ERROR;
- *pkp = NULL;
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_DSA:
- case KEY_DSA_CERT:
- if ((n = sshkey_new(k->type)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
- (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
- (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
- (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) {
- sshkey_free(n);
- return SSH_ERR_ALLOC_FAIL;
- }
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- case KEY_ECDSA_CERT:
- if ((n = sshkey_new(k->type)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- n->ecdsa_nid = k->ecdsa_nid;
- n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
- if (n->ecdsa == NULL) {
- sshkey_free(n);
- return SSH_ERR_ALLOC_FAIL;
- }
- if (EC_KEY_set_public_key(n->ecdsa,
- EC_KEY_get0_public_key(k->ecdsa)) != 1) {
- sshkey_free(n);
- return SSH_ERR_LIBCRYPTO_ERROR;
- }
- break;
- # endif /* OPENSSL_HAS_ECC */
- case KEY_RSA:
- case KEY_RSA1:
- case KEY_RSA_CERT:
- if ((n = sshkey_new(k->type)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
- (BN_copy(n->rsa->e, k->rsa->e) == NULL)) {
- sshkey_free(n);
- return SSH_ERR_ALLOC_FAIL;
- }
- break;
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- if ((n = sshkey_new(k->type)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if (k->ed25519_pk != NULL) {
- if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
- sshkey_free(n);
- return SSH_ERR_ALLOC_FAIL;
- }
- memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
- }
- break;
- default:
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- }
- if (sshkey_is_cert(k)) {
- if ((ret = sshkey_cert_copy(k, n)) != 0) {
- sshkey_free(n);
- return ret;
- }
- }
- *pkp = n;
- return 0;
- }
- 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 = reallocarray(key->cert->principals,
- 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, 0)) != 0)
- goto out;
- /* Success */
- ret = 0;
- out:
- sshbuf_free(ca);
- sshbuf_free(crit);
- sshbuf_free(exts);
- sshbuf_free(principals);
- free(sig);
- return ret;
- }
- 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, *curve = NULL;
- struct sshkey *key = NULL;
- size_t len;
- u_char *pk = NULL;
- struct sshbuf *copy;
- #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
- EC_POINT *q = NULL;
- #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
- #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;
- }
- switch (type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA_CERT:
- /* Skip nonce */
- if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- /* FALLTHROUGH */
- case KEY_RSA:
- if ((key = sshkey_new(type)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (sshbuf_get_bignum2(b, key->rsa->e) != 0 ||
- sshbuf_get_bignum2(b, key->rsa->n) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- #ifdef DEBUG_PK
- RSA_print_fp(stderr, key->rsa, 8);
- #endif
- break;
- case KEY_DSA_CERT:
- /* Skip nonce */
- if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- /* FALLTHROUGH */
- case KEY_DSA:
- if ((key = sshkey_new(type)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (sshbuf_get_bignum2(b, key->dsa->p) != 0 ||
- sshbuf_get_bignum2(b, key->dsa->q) != 0 ||
- sshbuf_get_bignum2(b, key->dsa->g) != 0 ||
- sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- #ifdef DEBUG_PK
- DSA_print_fp(stderr, key->dsa, 8);
- #endif
- break;
- case KEY_ECDSA_CERT:
- /* Skip nonce */
- if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- /* FALLTHROUGH */
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- if ((key = sshkey_new(type)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype);
- if (sshbuf_get_cstring(b, &curve, NULL) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
- ret = SSH_ERR_EC_CURVE_MISMATCH;
- goto out;
- }
- if (key->ecdsa != NULL)
- EC_KEY_free(key->ecdsa);
- if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
- == NULL) {
- ret = SSH_ERR_EC_CURVE_INVALID;
- goto out;
- }
- if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
- q) != 0) {
- ret = SSH_ERR_KEY_INVALID_EC_VALUE;
- goto out;
- }
- if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
- /* XXX assume it is a allocation error */
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- #ifdef DEBUG_PK
- sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
- #endif
- break;
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
- case KEY_ED25519_CERT:
- /* Skip nonce */
- if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- /* FALLTHROUGH */
- case KEY_ED25519:
- if ((ret = sshbuf_get_string(b, &pk, &len)) != 0)
- goto out;
- if (len != ED25519_PK_SZ) {
- ret = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- if ((key = sshkey_new(type)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- key->ed25519_pk = pk;
- pk = NULL;
- break;
- case KEY_UNSPEC:
- if ((key = sshkey_new(type)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- break;
- default:
- ret = SSH_ERR_KEY_TYPE_UNKNOWN;
- 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);
- free(curve);
- free(pk);
- #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
- if (q != NULL)
- EC_POINT_free(q);
- #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
- 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_sign(const struct sshkey *key,
- u_char **sigp, size_t *lenp,
- const u_char *data, size_t datalen, const char *alg, u_int compat)
- {
- if (sigp != NULL)
- *sigp = NULL;
- if (lenp != NULL)
- *lenp = 0;
- if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
- return SSH_ERR_INVALID_ARGUMENT;
- switch (key->type) {
- #ifdef WITH_OPENSSL
- case KEY_DSA_CERT:
- case KEY_DSA:
- return ssh_dss_sign(key, sigp, lenp, data, datalen, compat);
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA_CERT:
- case KEY_ECDSA:
- return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat);
- # endif /* OPENSSL_HAS_ECC */
- case KEY_RSA_CERT:
- case KEY_RSA:
- return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg);
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat);
- default:
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- }
- }
- /*
- * ssh_key_verify returns 0 for a correct signature and < 0 on error.
- */
- int
- sshkey_verify(const struct sshkey *key,
- const u_char *sig, size_t siglen,
- const u_char *data, size_t dlen, u_int compat)
- {
- if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
- return SSH_ERR_INVALID_ARGUMENT;
- switch (key->type) {
- #ifdef WITH_OPENSSL
- case KEY_DSA_CERT:
- case KEY_DSA:
- return ssh_dss_verify(key, sig, siglen, data, dlen, compat);
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA_CERT:
- case KEY_ECDSA:
- return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat);
- # endif /* OPENSSL_HAS_ECC */
- case KEY_RSA_CERT:
- case KEY_RSA:
- return ssh_rsa_verify(key, sig, siglen, data, dlen);
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- case KEY_ED25519_CERT:
- return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat);
- default:
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- }
- }
- /* Converts a private to a public key */
- int
- sshkey_demote(const struct sshkey *k, struct sshkey **dkp)
- {
- struct sshkey *pk;
- int ret = SSH_ERR_INTERNAL_ERROR;
- *dkp = NULL;
- if ((pk = calloc(1, sizeof(*pk))) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- pk->type = k->type;
- pk->flags = k->flags;
- pk->ecdsa_nid = k->ecdsa_nid;
- pk->dsa = NULL;
- pk->ecdsa = NULL;
- pk->rsa = NULL;
- pk->ed25519_pk = NULL;
- pk->ed25519_sk = NULL;
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA_CERT:
- if ((ret = sshkey_cert_copy(k, pk)) != 0)
- goto fail;
- /* FALLTHROUGH */
- case KEY_RSA1:
- case KEY_RSA:
- if ((pk->rsa = RSA_new()) == NULL ||
- (pk->rsa->e = BN_dup(k->rsa->e)) == NULL ||
- (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto fail;
- }
- break;
- case KEY_DSA_CERT:
- if ((ret = sshkey_cert_copy(k, pk)) != 0)
- goto fail;
- /* FALLTHROUGH */
- case KEY_DSA:
- if ((pk->dsa = DSA_new()) == NULL ||
- (pk->dsa->p = BN_dup(k->dsa->p)) == NULL ||
- (pk->dsa->q = BN_dup(k->dsa->q)) == NULL ||
- (pk->dsa->g = BN_dup(k->dsa->g)) == NULL ||
- (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto fail;
- }
- break;
- case KEY_ECDSA_CERT:
- if ((ret = sshkey_cert_copy(k, pk)) != 0)
- goto fail;
- /* FALLTHROUGH */
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid);
- if (pk->ecdsa == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto fail;
- }
- if (EC_KEY_set_public_key(pk->ecdsa,
- EC_KEY_get0_public_key(k->ecdsa)) != 1) {
- ret = SSH_ERR_LIBCRYPTO_ERROR;
- goto fail;
- }
- break;
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
- case KEY_ED25519_CERT:
- if ((ret = sshkey_cert_copy(k, pk)) != 0)
- goto fail;
- /* FALLTHROUGH */
- case KEY_ED25519:
- if (k->ed25519_pk != NULL) {
- if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto fail;
- }
- memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
- }
- break;
- default:
- ret = SSH_ERR_KEY_TYPE_UNKNOWN;
- fail:
- sshkey_free(pk);
- return ret;
- }
- *dkp = pk;
- return 0;
- }
- /* Convert a plain key to their _CERT equivalent */
- int
- sshkey_to_certified(struct sshkey *k)
- {
- int newtype;
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA:
- newtype = KEY_RSA_CERT;
- break;
- case KEY_DSA:
- newtype = KEY_DSA_CERT;
- break;
- case KEY_ECDSA:
- newtype = KEY_ECDSA_CERT;
- break;
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- newtype = KEY_ED25519_CERT;
- break;
- default:
- 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(struct sshkey *k, struct sshkey *ca, const char *alg)
- {
- 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;
- 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 ((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;
- /* XXX this substantially duplicates to_blob(); refactor */
- switch (k->type) {
- #ifdef WITH_OPENSSL
- case KEY_DSA_CERT:
- if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 ||
- (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 ||
- (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 ||
- (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0)
- goto out;
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA_CERT:
- if ((ret = sshbuf_put_cstring(cert,
- sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 ||
- (ret = sshbuf_put_ec(cert,
- EC_KEY_get0_public_key(k->ecdsa),
- EC_KEY_get0_group(k->ecdsa))) != 0)
- goto out;
- break;
- # endif /* OPENSSL_HAS_ECC */
- case KEY_RSA_CERT:
- if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 ||
- (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0)
- goto out;
- break;
- #endif /* WITH_OPENSSL */
- case KEY_ED25519_CERT:
- if ((ret = sshbuf_put_string(cert,
- k->ed25519_pk, ED25519_PK_SZ)) != 0)
- goto out;
- break;
- default:
- ret = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- 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 = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
- sshbuf_len(cert), alg, 0)) != 0)
- goto out;
- /* 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);
- sshbuf_free(principals);
- return ret;
- }
- int
- sshkey_cert_check_authority(const struct sshkey *k,
- int want_host, int require_principal,
- const char *name, const char **reason)
- {
- u_int i, principal_matches;
- time_t now = time(NULL);
- if (reason != NULL)
- *reason = NULL;
- 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 (now < 0) {
- /* yikes - system clock before epoch! */
- *reason = "Certificate invalid: not yet valid";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- if ((u_int64_t)now < k->cert->valid_after) {
- *reason = "Certificate invalid: not yet valid";
- return SSH_ERR_KEY_CERT_INVALID;
- }
- if ((u_int64_t)now >= 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 (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;
- }
- size_t
- sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l)
- {
- char from[32], to[32], ret[64];
- time_t tt;
- struct tm *tm;
- *from = *to = '\0';
- if (cert->valid_after == 0 &&
- cert->valid_before == 0xffffffffffffffffULL)
- return strlcpy(s, "forever", l);
- if (cert->valid_after != 0) {
- /* XXX revisit INT_MAX in 2038 :) */
- tt = cert->valid_after > INT_MAX ?
- INT_MAX : cert->valid_after;
- tm = localtime(&tt);
- strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
- }
- if (cert->valid_before != 0xffffffffffffffffULL) {
- /* XXX revisit INT_MAX in 2038 :) */
- tt = cert->valid_before > INT_MAX ?
- INT_MAX : cert->valid_before;
- tm = localtime(&tt);
- strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
- }
- 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);
- }
- int
- sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b)
- {
- int r = SSH_ERR_INTERNAL_ERROR;
- if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
- goto out;
- switch (key->type) {
- #ifdef WITH_OPENSSL
- case KEY_RSA:
- if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
- goto out;
- break;
- case KEY_RSA_CERT:
- 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 ||
- (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0)
- goto out;
- break;
- case KEY_DSA:
- if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 ||
- (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
- goto out;
- break;
- case KEY_DSA_CERT:
- 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 ||
- (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0)
- goto out;
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- if ((r = sshbuf_put_cstring(b,
- sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 ||
- (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 ||
- (r = sshbuf_put_bignum2(b,
- EC_KEY_get0_private_key(key->ecdsa))) != 0)
- goto out;
- break;
- case KEY_ECDSA_CERT:
- 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 ||
- (r = sshbuf_put_bignum2(b,
- EC_KEY_get0_private_key(key->ecdsa))) != 0)
- goto out;
- break;
- # endif /* OPENSSL_HAS_ECC */
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- if ((r = sshbuf_put_string(b, key->ed25519_pk,
- ED25519_PK_SZ)) != 0 ||
- (r = sshbuf_put_string(b, key->ed25519_sk,
- ED25519_SK_SZ)) != 0)
- goto out;
- break;
- case KEY_ED25519_CERT:
- 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 ||
- (r = sshbuf_put_string(b, key->ed25519_pk,
- ED25519_PK_SZ)) != 0 ||
- (r = sshbuf_put_string(b, key->ed25519_sk,
- ED25519_SK_SZ)) != 0)
- goto out;
- break;
- default:
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- /* success */
- r = 0;
- out:
- return r;
- }
- int
- sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
- {
- char *tname = NULL, *curve = NULL;
- struct sshkey *k = NULL;
- size_t pklen = 0, sklen = 0;
- int type, r = SSH_ERR_INTERNAL_ERROR;
- u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
- #ifdef WITH_OPENSSL
- BIGNUM *exponent = NULL;
- #endif /* WITH_OPENSSL */
- if (kp != NULL)
- *kp = NULL;
- if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0)
- goto out;
- type = sshkey_type_from_name(tname);
- switch (type) {
- #ifdef WITH_OPENSSL
- case KEY_DSA:
- if ((k = sshkey_new_private(type)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
- goto out;
- break;
- case KEY_DSA_CERT:
- if ((r = sshkey_froms(buf, &k)) != 0 ||
- (r = sshkey_add_private(k)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0)
- goto out;
- break;
- # ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- if ((k = sshkey_new_private(type)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0)
- goto out;
- if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) {
- r = SSH_ERR_EC_CURVE_MISMATCH;
- goto out;
- }
- k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
- if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 ||
- (r = sshbuf_get_bignum2(buf, exponent)))
- goto out;
- if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
- EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
- (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
- goto out;
- break;
- case KEY_ECDSA_CERT:
- if ((exponent = BN_new()) == NULL) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if ((r = sshkey_froms(buf, &k)) != 0 ||
- (r = sshkey_add_private(k)) != 0 ||
- (r = sshbuf_get_bignum2(buf, exponent)) != 0)
- goto out;
- if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
- EC_KEY_get0_public_key(k->ecdsa))) != 0 ||
- (r = sshkey_ec_validate_private(k->ecdsa)) != 0)
- goto out;
- break;
- # endif /* OPENSSL_HAS_ECC */
- case KEY_RSA:
- if ((k = sshkey_new_private(type)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
- (r = rsa_generate_additional_parameters(k->rsa)) != 0)
- goto out;
- break;
- case KEY_RSA_CERT:
- if ((r = sshkey_froms(buf, &k)) != 0 ||
- (r = sshkey_add_private(k)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 ||
- (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 ||
- (r = rsa_generate_additional_parameters(k->rsa)) != 0)
- goto out;
- break;
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- if ((k = sshkey_new_private(type)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
- (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
- goto out;
- if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- k->ed25519_pk = ed25519_pk;
- k->ed25519_sk = ed25519_sk;
- ed25519_pk = ed25519_sk = NULL;
- break;
- case KEY_ED25519_CERT:
- if ((r = sshkey_froms(buf, &k)) != 0 ||
- (r = sshkey_add_private(k)) != 0 ||
- (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 ||
- (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0)
- goto out;
- if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- k->ed25519_pk = ed25519_pk;
- k->ed25519_sk = ed25519_sk;
- ed25519_pk = ed25519_sk = NULL;
- break;
- default:
- r = SSH_ERR_KEY_TYPE_UNKNOWN;
- goto out;
- }
- #ifdef WITH_OPENSSL
- /* enable blinding */
- switch (k->type) {
- case KEY_RSA:
- case KEY_RSA_CERT:
- case KEY_RSA1:
- if (RSA_blinding_on(k->rsa, NULL) != 1) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- break;
- }
- #endif /* WITH_OPENSSL */
- /* success */
- r = 0;
- if (kp != NULL) {
- *kp = k;
- k = NULL;
- }
- out:
- free(tname);
- free(curve);
- #ifdef WITH_OPENSSL
- if (exponent != NULL)
- BN_clear_free(exponent);
- #endif /* WITH_OPENSSL */
- sshkey_free(k);
- if (ed25519_pk != NULL) {
- explicit_bzero(ed25519_pk, pklen);
- free(ed25519_pk);
- }
- if (ed25519_sk != NULL) {
- explicit_bzero(ed25519_sk, sklen);
- free(ed25519_sk);
- }
- return r;
- }
- #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
- int
- sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
- {
- BN_CTX *bnctx;
- EC_POINT *nq = NULL;
- BIGNUM *order, *x, *y, *tmp;
- 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.
- */
- if ((bnctx = BN_CTX_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- BN_CTX_start(bnctx);
- /*
- * 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_CTX_get(bnctx)) == NULL ||
- (y = BN_CTX_get(bnctx)) == NULL ||
- (order = BN_CTX_get(bnctx)) == NULL ||
- (tmp = BN_CTX_get(bnctx)) == 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, bnctx) != 1 ||
- EC_POINT_get_affine_coordinates_GFp(group, public,
- x, y, bnctx) != 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, bnctx) != 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_CTX_free(bnctx);
- if (nq != NULL)
- EC_POINT_free(nq);
- return ret;
- }
- int
- sshkey_ec_validate_private(const EC_KEY *key)
- {
- BN_CTX *bnctx;
- BIGNUM *order, *tmp;
- int ret = SSH_ERR_KEY_INVALID_EC_VALUE;
- if ((bnctx = BN_CTX_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- BN_CTX_start(bnctx);
- if ((order = BN_CTX_get(bnctx)) == NULL ||
- (tmp = BN_CTX_get(bnctx)) == NULL) {
- ret = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- /* log2(private) > log2(order)/2 */
- if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 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_CTX_free(bnctx);
- return ret;
- }
- void
- sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
- {
- BIGNUM *x, *y;
- BN_CTX *bnctx;
- if (point == NULL) {
- fputs("point=(NULL)\n", stderr);
- return;
- }
- if ((bnctx = BN_CTX_new()) == NULL) {
- fprintf(stderr, "%s: BN_CTX_new failed\n", __func__);
- return;
- }
- BN_CTX_start(bnctx);
- if ((x = BN_CTX_get(bnctx)) == NULL ||
- (y = BN_CTX_get(bnctx)) == NULL) {
- fprintf(stderr, "%s: BN_CTX_get failed\n", __func__);
- return;
- }
- 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__);
- return;
- }
- if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y,
- bnctx) != 1) {
- fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n",
- __func__);
- return;
- }
- fputs("x=", stderr);
- BN_print_fp(stderr, x);
- fputs("\ny=", stderr);
- BN_print_fp(stderr, y);
- fputs("\n", stderr);
- BN_CTX_free(bnctx);
- }
- 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(const 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];
- char *b64 = NULL;
- 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;
- else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) {
- r = SSH_ERR_INVALID_ARGUMENT;
- goto out;
- }
- if ((cipher = cipher_by_name(ciphername)) == NULL) {
- r = SSH_ERR_INTERNAL_ERROR;
- 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(prv, encrypted)) != 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;
- /* uuencode */
- if ((b64 = sshbuf_dtob64(encoded)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- sshbuf_reset(blob);
- if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0)
- goto out;
- for (i = 0; i < strlen(b64); i++) {
- if ((r = sshbuf_put_u8(blob, b64[i])) != 0)
- goto out;
- /* insert line breaks */
- if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
- goto out;
- }
- if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0)
- goto out;
- if ((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) {
- explicit_bzero(key, keylen + ivlen);
- free(key);
- }
- if (pubkeyblob != NULL) {
- explicit_bzero(pubkeyblob, pubkeylen);
- free(pubkeyblob);
- }
- if (b64 != NULL) {
- explicit_bzero(b64, strlen(b64));
- free(b64);
- }
- return r;
- }
- static int
- sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase,
- struct sshkey **keyp, char **commentp)
- {
- char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
- const struct sshcipher *cipher = NULL;
- const u_char *cp;
- int r = SSH_ERR_INTERNAL_ERROR;
- size_t encoded_len;
- size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0;
- struct sshbuf *encoded = NULL, *decoded = NULL;
- struct sshbuf *kdf = NULL, *decrypted = NULL;
- struct sshcipher_ctx *ciphercontext = NULL;
- struct sshkey *k = NULL;
- u_char *key = NULL, *salt = NULL, *dp, pad, last;
- u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
- if (keyp != NULL)
- *keyp = NULL;
- if (commentp != NULL)
- *commentp = NULL;
- if ((encoded = sshbuf_new()) == NULL ||
- (decoded = sshbuf_new()) == NULL ||
- (decrypted = 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;
- }
- /* 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 ||
- (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */
- (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 ((passphrase == NULL || strlen(passphrase) == 0) &&
- strcmp(ciphername, "none") != 0) {
- /* passphrase required */
- r = SSH_ERR_KEY_WRONG_PASSPHRASE;
- goto out;
- }
- if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
- r = SSH_ERR_KEY_UNKNOWN_CIPHER;
- goto out;
- }
- if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- if (nkeys != 1) {
- /* XXX only one key supported */
- r = SSH_ERR_INVALID_FORMAT;
- 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) < encrypted_len + authlen) {
- 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;
- }
- /* 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 */
- 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;
- }
- }
- /* XXX decode pubkey and check against private */
- /* success */
- r = 0;
- if (keyp != NULL) {
- *keyp = k;
- k = NULL;
- }
- if (commentp != NULL) {
- *commentp = comment;
- comment = NULL;
- }
- out:
- pad = 0;
- cipher_free(ciphercontext);
- free(ciphername);
- free(kdfname);
- free(comment);
- if (salt != NULL) {
- explicit_bzero(salt, slen);
- free(salt);
- }
- if (key != NULL) {
- explicit_bzero(key, keylen + ivlen);
- free(key);
- }
- sshbuf_free(encoded);
- sshbuf_free(decoded);
- sshbuf_free(kdf);
- sshbuf_free(decrypted);
- sshkey_free(k);
- return r;
- }
- #if WITH_SSH1
- /*
- * Serialises the authentication (private) key to a blob, encrypting it with
- * passphrase. The identification of the blob (lowest 64 bits of n) will
- * precede the key to provide identification of the key without needing a
- * passphrase.
- */
- static int
- sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob,
- const char *passphrase, const char *comment)
- {
- struct sshbuf *buffer = NULL, *encrypted = NULL;
- u_char buf[8];
- int r, cipher_num;
- struct sshcipher_ctx *ciphercontext = NULL;
- const struct sshcipher *cipher;
- u_char *cp;
- /*
- * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
- * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
- */
- cipher_num = (strcmp(passphrase, "") == 0) ?
- SSH_CIPHER_NONE : SSH_CIPHER_3DES;
- if ((cipher = cipher_by_number(cipher_num)) == NULL)
- return SSH_ERR_INTERNAL_ERROR;
- /* This buffer is used to build the secret part of the private key. */
- if ((buffer = sshbuf_new()) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- /* Put checkbytes for checking passphrase validity. */
- if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0)
- goto out;
- arc4random_buf(cp, 2);
- memcpy(cp + 2, cp, 2);
- /*
- * Store the private key (n and e will not be stored because they
- * will be stored in plain text, and storing them also in encrypted
- * format would just give known plaintext).
- * Note: q and p are stored in reverse order to SSL.
- */
- if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 ||
- (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 ||
- (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 ||
- (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0)
- goto out;
- /* Pad the part to be encrypted to a size that is a multiple of 8. */
- explicit_bzero(buf, 8);
- if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0)
- goto out;
- /* This buffer will be used to contain the data in the file. */
- if ((encrypted = sshbuf_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- /* First store keyfile id string. */
- if ((r = sshbuf_put(encrypted, LEGACY_BEGIN,
- sizeof(LEGACY_BEGIN))) != 0)
- goto out;
- /* Store cipher type and "reserved" field. */
- if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 ||
- (r = sshbuf_put_u32(encrypted, 0)) != 0)
- goto out;
- /* Store public key. This will be in plain text. */
- if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 ||
- (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 ||
- (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 ||
- (r = sshbuf_put_cstring(encrypted, comment)) != 0)
- goto out;
- /* Allocate space for the private part of the key in the buffer. */
- if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0)
- goto out;
- if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
- CIPHER_ENCRYPT)) != 0)
- goto out;
- if ((r = cipher_crypt(ciphercontext, 0, cp,
- sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0)
- goto out;
- r = sshbuf_putb(blob, encrypted);
- out:
- cipher_free(ciphercontext);
- explicit_bzero(buf, sizeof(buf));
- sshbuf_free(buffer);
- sshbuf_free(encrypted);
- return r;
- }
- #endif /* WITH_SSH1 */
- #ifdef WITH_OPENSSL
- /* convert SSH v2 key in OpenSSL PEM format */
- static int
- sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob,
- const char *_passphrase, const char *comment)
- {
- int success, r;
- int blen, len = strlen(_passphrase);
- u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
- #if (OPENSSL_VERSION_NUMBER < 0x00907000L)
- const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
- #else
- const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
- #endif
- const u_char *bptr;
- BIO *bio = NULL;
- if (len > 0 && len <= 4)
- return SSH_ERR_PASSPHRASE_TOO_SHORT;
- if ((bio = BIO_new(BIO_s_mem())) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- switch (key->type) {
- case KEY_DSA:
- success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
- cipher, passphrase, len, NULL, NULL);
- break;
- #ifdef OPENSSL_HAS_ECC
- case KEY_ECDSA:
- success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
- cipher, passphrase, len, NULL, NULL);
- break;
- #endif
- case KEY_RSA:
- success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
- cipher, passphrase, len, NULL, NULL);
- break;
- default:
- success = 0;
- break;
- }
- if (success == 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:
- 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 force_new_format, const char *new_format_cipher, int new_format_rounds)
- {
- switch (key->type) {
- #ifdef WITH_SSH1
- case KEY_RSA1:
- return sshkey_private_rsa1_to_blob(key, blob,
- passphrase, comment);
- #endif /* WITH_SSH1 */
- #ifdef WITH_OPENSSL
- case KEY_DSA:
- case KEY_ECDSA:
- case KEY_RSA:
- if (force_new_format) {
- return sshkey_private_to_blob2(key, blob, passphrase,
- comment, new_format_cipher, new_format_rounds);
- }
- return sshkey_private_pem_to_blob(key, blob,
- passphrase, comment);
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- return sshkey_private_to_blob2(key, blob, passphrase,
- comment, new_format_cipher, new_format_rounds);
- default:
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- }
- }
- #ifdef WITH_SSH1
- /*
- * Parse the public, unencrypted portion of a RSA1 key.
- */
- int
- sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob,
- struct sshkey **keyp, char **commentp)
- {
- int r;
- struct sshkey *pub = NULL;
- struct sshbuf *copy = NULL;
- if (keyp != NULL)
- *keyp = NULL;
- if (commentp != NULL)
- *commentp = NULL;
- /* Check that it is at least big enough to contain the ID string. */
- if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
- return SSH_ERR_INVALID_FORMAT;
- /*
- * Make sure it begins with the id string. Consume the id string
- * from the buffer.
- */
- if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
- return SSH_ERR_INVALID_FORMAT;
- /* Make a working copy of the keyblob and skip past the magic */
- if ((copy = sshbuf_fromb(blob)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
- if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
- goto out;
- /* Skip cipher type, reserved data and key bits. */
- if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */
- (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */
- (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */
- goto out;
- /* Read the public key from the buffer. */
- if ((pub = sshkey_new(KEY_RSA1)) == NULL ||
- (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 ||
- (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0)
- goto out;
- /* Finally, the comment */
- if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0)
- goto out;
- /* The encrypted private part is not parsed by this function. */
- r = 0;
- if (keyp != NULL) {
- *keyp = pub;
- pub = NULL;
- }
- out:
- sshbuf_free(copy);
- sshkey_free(pub);
- return r;
- }
- static int
- sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase,
- struct sshkey **keyp, char **commentp)
- {
- int r;
- u_int16_t check1, check2;
- u_int8_t cipher_type;
- struct sshbuf *decrypted = NULL, *copy = NULL;
- u_char *cp;
- char *comment = NULL;
- struct sshcipher_ctx *ciphercontext = NULL;
- const struct sshcipher *cipher;
- struct sshkey *prv = NULL;
- if (keyp != NULL)
- *keyp = NULL;
- if (commentp != NULL)
- *commentp = NULL;
- /* Check that it is at least big enough to contain the ID string. */
- if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN))
- return SSH_ERR_INVALID_FORMAT;
- /*
- * Make sure it begins with the id string. Consume the id string
- * from the buffer.
- */
- if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0)
- return SSH_ERR_INVALID_FORMAT;
- if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((copy = sshbuf_fromb(blob)) == NULL ||
- (decrypted = sshbuf_new()) == NULL) {
- r = SSH_ERR_ALLOC_FAIL;
- goto out;
- }
- if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0)
- goto out;
- /* Read cipher type. */
- if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 ||
- (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */
- goto out;
- /* Read the public key and comment from the buffer. */
- if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */
- (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 ||
- (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 ||
- (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0)
- goto out;
- /* Check that it is a supported cipher. */
- cipher = cipher_by_number(cipher_type);
- if (cipher == NULL) {
- r = SSH_ERR_KEY_UNKNOWN_CIPHER;
- goto out;
- }
- /* Initialize space for decrypted data. */
- if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0)
- goto out;
- /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
- if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase,
- CIPHER_DECRYPT)) != 0)
- goto out;
- if ((r = cipher_crypt(ciphercontext, 0, cp,
- sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0)
- goto out;
- if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 ||
- (r = sshbuf_get_u16(decrypted, &check2)) != 0)
- goto out;
- if (check1 != check2) {
- r = SSH_ERR_KEY_WRONG_PASSPHRASE;
- goto out;
- }
- /* Read the rest of the private key. */
- if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 ||
- (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 ||
- (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 ||
- (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0)
- goto out;
- /* calculate p-1 and q-1 */
- if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0)
- goto out;
- /* enable blinding */
- if (RSA_blinding_on(prv->rsa, NULL) != 1) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
- r = 0;
- if (keyp != NULL) {
- *keyp = prv;
- prv = NULL;
- }
- if (commentp != NULL) {
- *commentp = comment;
- comment = NULL;
- }
- out:
- cipher_free(ciphercontext);
- free(comment);
- sshkey_free(prv);
- sshbuf_free(copy);
- sshbuf_free(decrypted);
- return r;
- }
- #endif /* WITH_SSH1 */
- #ifdef WITH_OPENSSL
- 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;
- }
- if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
- (char *)passphrase)) == NULL) {
- r = SSH_ERR_KEY_WRONG_PASSPHRASE;
- goto out;
- }
- if (pk->type == 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;
- }
- } else if (pk->type == 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
- #ifdef OPENSSL_HAS_ECC
- } else if (pk->type == 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 */
- } else {
- r = SSH_ERR_INVALID_FORMAT;
- goto out;
- }
- r = 0;
- if (keyp != NULL) {
- *keyp = prv;
- prv = NULL;
- }
- out:
- BIO_free(bio);
- if (pk != NULL)
- 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)
- {
- if (keyp != NULL)
- *keyp = NULL;
- if (commentp != NULL)
- *commentp = NULL;
- switch (type) {
- #ifdef WITH_SSH1
- case KEY_RSA1:
- return sshkey_parse_private_rsa1(blob, passphrase,
- keyp, commentp);
- #endif /* WITH_SSH1 */
- #ifdef WITH_OPENSSL
- case KEY_DSA:
- case KEY_ECDSA:
- case KEY_RSA:
- return sshkey_parse_private_pem_fileblob(blob, type,
- passphrase, keyp);
- #endif /* WITH_OPENSSL */
- case KEY_ED25519:
- return sshkey_parse_private2(blob, type, passphrase,
- keyp, commentp);
- case KEY_UNSPEC:
- if (sshkey_parse_private2(blob, type, passphrase, keyp,
- commentp) == 0)
- return 0;
- #ifdef WITH_OPENSSL
- return sshkey_parse_private_pem_fileblob(blob, type,
- passphrase, keyp);
- #else
- return SSH_ERR_INVALID_FORMAT;
- #endif /* WITH_OPENSSL */
- default:
- return SSH_ERR_KEY_TYPE_UNKNOWN;
- }
- }
- 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;
- #ifdef WITH_SSH1
- /* it's a SSH v1 key if the public key part is readable */
- if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) {
- return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
- passphrase, keyp, commentp);
- }
- #endif /* WITH_SSH1 */
- return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
- passphrase, keyp, commentp);
- }
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