- djm@cvs.openbsd.org 2014/06/24 01:13:21
[Makefile.in auth-bsdauth.c auth-chall.c auth-options.c auth-rsa.c
[auth2-none.c auth2-pubkey.c authfile.c authfile.h cipher-3des1.c
[cipher-chachapoly.c cipher-chachapoly.h cipher.c cipher.h
[digest-libc.c digest-openssl.c digest.h dns.c entropy.c hmac.h
[hostfile.c key.c key.h krl.c monitor.c packet.c rsa.c rsa.h
[ssh-add.c ssh-agent.c ssh-dss.c ssh-ecdsa.c ssh-ed25519.c
[ssh-keygen.c ssh-pkcs11-client.c ssh-pkcs11-helper.c ssh-pkcs11.c
[ssh-rsa.c sshbuf-misc.c sshbuf.h sshconnect.c sshconnect1.c
[sshconnect2.c sshd.c sshkey.c sshkey.h
[openbsd-compat/openssl-compat.c openbsd-compat/openssl-compat.h]
New key API: refactor key-related functions to be more library-like,
existing API is offered as a set of wrappers.
with and ok markus@
Thanks also to Ben Hawkes, David Tomaschik, Ivan Fratric, Matthew
Dempsky and Ron Bowes for a detailed review a few months ago.
NB. This commit also removes portable OpenSSH support for OpenSSL
<0.9.8e.
diff --git a/sshkey.c b/sshkey.c
new file mode 100644
index 0000000..24023d0
--- /dev/null
+++ b/sshkey.c
@@ -0,0 +1,3843 @@
+/* $OpenBSD: sshkey.c,v 1.2 2014/06/27 18:50:39 markus 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/param.h>
+#include <sys/types.h>
+
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+
+#include "crypto_api.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <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"
+
+/* 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(const u_char *blob, size_t blen,
+ struct sshkey **keyp, int allow_cert);
+
+/* Supported key types */
+struct keytype {
+ const char *name;
+ const char *shortname;
+ int type;
+ int nid;
+ int cert;
+};
+static const struct keytype keytypes[] = {
+ { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
+ { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
+ KEY_ED25519_CERT, 0, 1 },
+#ifdef WITH_OPENSSL
+ { NULL, "RSA1", KEY_RSA1, 0, 0 },
+ { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
+ { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
+# ifdef OPENSSL_HAS_ECC
+ { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
+ { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
+# ifdef OPENSSL_HAS_NISTP521
+ { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
+# endif /* OPENSSL_HAS_NISTP521 */
+# endif /* OPENSSL_HAS_ECC */
+ { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
+ { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
+# ifdef OPENSSL_HAS_ECC
+ { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
+ KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
+ { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
+ KEY_ECDSA_CERT, NID_secp384r1, 1 },
+# ifdef OPENSSL_HAS_NISTP521
+ { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
+ KEY_ECDSA_CERT, NID_secp521r1, 1 },
+# endif /* OPENSSL_HAS_NISTP521 */
+# endif /* OPENSSL_HAS_ECC */
+ { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
+ KEY_RSA_CERT_V00, 0, 1 },
+ { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
+ KEY_DSA_CERT_V00, 0, 1 },
+#endif /* WITH_OPENSSL */
+ { NULL, NULL, -1, -1, 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 *
+key_alg_list(int certs_only, int plain_only)
+{
+ char *tmp, *ret = NULL;
+ size_t nlen, rlen = 0;
+ const struct keytype *kt;
+
+ for (kt = keytypes; kt->type != -1; kt++) {
+ if (kt->name == NULL)
+ continue;
+ if ((certs_only && !kt->cert) || (plain_only && kt->cert))
+ continue;
+ if (ret != NULL)
+ ret[rlen++] = '\n';
+ 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)
+{
+ char *s, *cp, *p;
+
+ 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, ","))) {
+ switch (sshkey_type_from_name(p)) {
+ case KEY_RSA1:
+ case KEY_UNSPEC:
+ 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_V00:
+ case KEY_RSA_CERT:
+ return BN_num_bits(k->rsa->n);
+ case KEY_DSA:
+ case KEY_DSA_CERT_V00:
+ 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;
+}
+
+int
+sshkey_cert_is_legacy(const struct sshkey *k)
+{
+ switch (k->type) {
+ case KEY_DSA_CERT_V00:
+ case KEY_RSA_CERT_V00:
+ return 1;
+ default:
+ 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_V00:
+ case KEY_RSA_CERT:
+ return KEY_RSA;
+ case KEY_DSA_CERT_V00:
+ 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;
+ if (cert->certblob != NULL)
+ sshbuf_free(cert->certblob);
+ if (cert->critical != NULL)
+ sshbuf_free(cert->critical);
+ if (cert->extensions != NULL)
+ sshbuf_free(cert->extensions);
+ if (cert->key_id != NULL)
+ free(cert->key_id);
+ for (i = 0; i < cert->nprincipals; i++)
+ free(cert->principals[i]);
+ if (cert->principals != NULL)
+ free(cert->principals);
+ if (cert->signature_key != NULL)
+ 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_V00:
+ 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_V00:
+ 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;
+ break;
+ }
+
+ 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_V00:
+ 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_V00:
+ 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_V00:
+ case KEY_RSA_CERT:
+ if (k->rsa != NULL)
+ RSA_free(k->rsa);
+ k->rsa = NULL;
+ break;
+ case KEY_DSA:
+ case KEY_DSA_CERT_V00:
+ 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)
+{
+#ifdef WITH_OPENSSL
+ BN_CTX *bnctx;
+#endif /* WITH_OPENSSL */
+
+ 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_V00:
+ 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_V00:
+ 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;
+
+ 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_V00:
+ case KEY_RSA_CERT_V00:
+ 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;
+ 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;
+ 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_to_blob_buf(const struct sshkey *key, struct sshbuf *b)
+{
+ return to_blob_buf(key, b, 0);
+}
+
+int
+sshkey_plain_to_blob_buf(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, enum sshkey_fp_type dgst_type,
+ u_char **retp, size_t *lenp)
+{
+ u_char *blob = NULL, *ret = NULL;
+ size_t blob_len = 0;
+ int hash_alg = -1, r = SSH_ERR_INTERNAL_ERROR;
+
+ if (retp != NULL)
+ *retp = NULL;
+ if (lenp != NULL)
+ *lenp = 0;
+
+ switch (dgst_type) {
+ case SSH_FP_MD5:
+ hash_alg = SSH_DIGEST_MD5;
+ break;
+ case SSH_FP_SHA1:
+ hash_alg = SSH_DIGEST_SHA1;
+ break;
+ case SSH_FP_SHA256:
+ hash_alg = SSH_DIGEST_SHA256;
+ break;
+ default:
+ 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);
+
+ blob_len = nlen + elen;
+ if (nlen >= INT_MAX - elen ||
+ (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(hash_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(hash_alg);
+ r = 0;
+ out:
+ free(ret);
+ if (blob != NULL) {
+ explicit_bzero(blob, blob_len);
+ free(blob);
+ }
+ return r;
+}
+
+static char *
+fingerprint_hex(u_char *dgst_raw, size_t dgst_raw_len)
+{
+ char *retval;
+ size_t i;
+
+ if ((retval = calloc(1, dgst_raw_len * 3 + 1)) == NULL)
+ return NULL;
+ for (i = 0; i < dgst_raw_len; i++) {
+ char hex[4];
+ snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
+ strlcat(retval, hex, dgst_raw_len * 3 + 1);
+ }
+
+ /* Remove the trailing ':' character */
+ retval[(dgst_raw_len * 3) - 1] = '\0';
+ 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(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;
+ u_char field[FLDSIZE_X][FLDSIZE_Y];
+ size_t i;
+ u_int b;
+ int x, y;
+ 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 = MAX(x, 0);
+ y = MAX(y, 0);
+ x = MIN(x, FLDSIZE_X - 1);
+ y = MIN(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;
+
+ /* fill in retval */
+ snprintf(retval, FLDSIZE_X, "+--[%4s %4u]",
+ sshkey_type(k), sshkey_size(k));
+ p = strchr(retval, '\0');
+
+ /* output upper border */
+ for (i = p - retval - 1; 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[MIN(field[x][y], len)];
+ *p++ = '|';
+ *p++ = '\n';
+ }
+
+ /* output lower border */
+ *p++ = '+';
+ for (i = 0; i < FLDSIZE_X; i++)
+ *p++ = '-';
+ *p++ = '+';
+
+ return retval;
+}
+
+char *
+sshkey_fingerprint(const struct sshkey *k, enum sshkey_fp_type dgst_type,
+ enum sshkey_fp_rep dgst_rep)
+{
+ char *retval = NULL;
+ u_char *dgst_raw;
+ size_t dgst_raw_len;
+
+ if (sshkey_fingerprint_raw(k, dgst_type, &dgst_raw, &dgst_raw_len) != 0)
+ return NULL;
+ switch (dgst_rep) {
+ case SSH_FP_HEX:
+ retval = fingerprint_hex(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(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 (index(" \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 *cp, *space;
+ int r, type, curve_nid = -1;
+ struct sshbuf *blob;
+#ifdef WITH_SSH1
+ char *ep;
+ 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' || index(" \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;
+ *cpp = ep;
+ /* validate the claimed number of bits */
+ if (BN_num_bits(ret->rsa->n) != (int)bits)
+ return SSH_ERR_KEY_BITS_MISMATCH;
+ 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_V00:
+ case KEY_RSA_CERT_V00:
+ 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;
+ } else if (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)
+ *space = '\0';
+ 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;
+ }
+/*XXXX*/
+ 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;
+ }
+#ifdef WITH_OPENSSL
+ if (sshkey_type_plain(ret->type) == 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
+ }
+ if (sshkey_type_plain(ret->type) == 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
+ }
+# ifdef OPENSSL_HAS_ECC
+ if (sshkey_type_plain(ret->type) == 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
+ }
+# endif /* OPENSSL_HAS_ECC */
+#endif /* WITH_OPENSSL */
+ if (sshkey_type_plain(ret->type) == KEY_ED25519) {
+ free(ret->ed25519_pk);
+ ret->ed25519_pk = k->ed25519_pk;
+ k->ed25519_pk = NULL;
+#ifdef DEBUG_PK
+ /* XXX */
+#endif
+ }
+ retval = 0;
+/*XXXX*/
+ sshkey_free(k);
+ if (retval != 0)
+ break;
+ /* advance cp: skip whitespace and data */
+ while (*cp == ' ' || *cp == '\t')
+ cp++;
+ while (*cp != '\0' && *cp != ' ' && *cp != '\t')
+ cp++;
+ *cpp = cp;
+ break;
+ default:
+ return SSH_ERR_INVALID_ARGUMENT;
+ }
+ return retval;
+}
+
+int
+sshkey_write(const struct sshkey *key, FILE *f)
+{
+ int ret = SSH_ERR_INTERNAL_ERROR;
+ struct sshbuf *b = NULL, *bb = NULL;
+ char *uu = NULL;
+#ifdef WITH_SSH1
+ u_int bits = 0;
+ char *dec_e = NULL, *dec_n = NULL;
+#endif /* WITH_SSH1 */
+
+ 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;
+ }
+ if ((b = sshbuf_new()) == NULL)
+ return SSH_ERR_ALLOC_FAIL;
+ switch (key->type) {
+#ifdef WITH_SSH1
+ case KEY_RSA1:
+ if (key->rsa == NULL || key->rsa->e == NULL ||
+ key->rsa->n == NULL) {
+ ret = SSH_ERR_INVALID_ARGUMENT;
+ goto out;
+ }
+ if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL ||
+ (dec_n = BN_bn2dec(key->rsa->n)) == NULL) {
+ ret = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ /* size of modulus 'n' */
+ if ((bits = BN_num_bits(key->rsa->n)) <= 0) {
+ ret = SSH_ERR_INVALID_ARGUMENT;
+ goto out;
+ }
+ if ((ret = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0)
+ goto out;
+#endif /* WITH_SSH1 */
+ break;
+#ifdef WITH_OPENSSL
+ case KEY_DSA:
+ case KEY_DSA_CERT_V00:
+ case KEY_DSA_CERT:
+ case KEY_ECDSA:
+ case KEY_ECDSA_CERT:
+ case KEY_RSA:
+ case KEY_RSA_CERT_V00:
+ case KEY_RSA_CERT:
+#endif /* WITH_OPENSSL */
+ case KEY_ED25519:
+ case KEY_ED25519_CERT:
+ if ((bb = sshbuf_new()) == NULL) {
+ ret = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ if ((ret = sshkey_to_blob_buf(key, bb)) != 0)
+ goto out;
+ if ((uu = sshbuf_dtob64(bb)) == NULL) {
+ ret = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ if ((ret = sshbuf_putf(b, "%s ", sshkey_ssh_name(key))) != 0)
+ goto out;
+ if ((ret = sshbuf_put(b, uu, strlen(uu))) != 0)
+ goto out;
+ break;
+ default:
+ ret = SSH_ERR_KEY_TYPE_UNKNOWN;
+ goto out;
+ }
+ if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
+ if (feof(f))
+ errno = EPIPE;
+ ret = SSH_ERR_SYSTEM_ERROR;
+ goto out;
+ }
+ ret = 0;
+ out:
+ if (b != NULL)
+ sshbuf_free(b);
+ if (bb != NULL)
+ sshbuf_free(bb);
+ if (uu != NULL)
+ free(uu);
+#ifdef WITH_SSH1
+ if (dec_e != NULL)
+ OPENSSL_free(dec_e);
+ if (dec_n != NULL)
+ OPENSSL_free(dec_n);
+#endif /* WITH_SSH1 */
+ return ret;
+}
+
+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)) {
+ DSA_free(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;
+
+ if (pkp != NULL)
+ *pkp = NULL;
+
+ switch (k->type) {
+#ifdef WITH_OPENSSL
+ case KEY_DSA:
+ case KEY_DSA_CERT_V00:
+ 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_V00:
+ 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, const u_char *blob,
+ size_t blen)
+{
+ u_char *principals = NULL, *critical = NULL, *exts = NULL;
+ u_char *sig_key = NULL, *sig = NULL;
+ size_t signed_len, plen, clen, sklen, slen, kidlen, elen;
+ struct sshbuf *tmp;
+ char *principal;
+ int ret = SSH_ERR_INTERNAL_ERROR;
+ int v00 = sshkey_cert_is_legacy(key);
+ char **oprincipals;
+
+ if ((tmp = sshbuf_new()) == NULL)
+ return SSH_ERR_ALLOC_FAIL;
+
+ /* Copy the entire key blob for verification and later serialisation */
+ if ((ret = sshbuf_put(key->cert->certblob, blob, blen)) != 0)
+ return ret;
+
+ elen = 0; /* Not touched for v00 certs */
+ principals = exts = critical = sig_key = sig = NULL;
+ if ((!v00 && (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_get_string(b, &principals, &plen)) != 0 ||
+ (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 ||
+ (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 ||
+ (ret = sshbuf_get_string(b, &critical, &clen)) != 0 ||
+ (!v00 && (ret = sshbuf_get_string(b, &exts, &elen)) != 0) ||
+ (v00 && (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0) ||
+ (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 ||
+ (ret = sshbuf_get_string(b, &sig_key, &sklen)) != 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;
+ }
+
+ if ((ret = sshbuf_put(tmp, principals, plen)) != 0)
+ goto out;
+ while (sshbuf_len(tmp) > 0) {
+ if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ if ((ret = sshbuf_get_cstring(tmp, &principal, &plen)) != 0) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ oprincipals = key->cert->principals;
+ key->cert->principals = realloc(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;
+ }
+
+ sshbuf_reset(tmp);
+
+ if ((ret = sshbuf_put(key->cert->critical, critical, clen)) != 0 ||
+ (ret = sshbuf_put(tmp, critical, clen)) != 0)
+ goto out;
+
+ /* validate structure */
+ while (sshbuf_len(tmp) != 0) {
+ if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
+ (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ }
+ sshbuf_reset(tmp);
+
+ if ((ret = sshbuf_put(key->cert->extensions, exts, elen)) != 0 ||
+ (ret = sshbuf_put(tmp, exts, elen)) != 0)
+ goto out;
+
+ /* validate structure */
+ while (sshbuf_len(tmp) != 0) {
+ if ((ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0 ||
+ (ret = sshbuf_get_string_direct(tmp, NULL, NULL)) != 0) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ }
+ sshbuf_reset(tmp);
+
+ if (sshkey_from_blob_internal(sig_key, sklen,
+ &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;
+ ret = 0;
+
+ out:
+ sshbuf_free(tmp);
+ free(principals);
+ free(critical);
+ free(exts);
+ free(sig_key);
+ free(sig);
+ return ret;
+}
+
+static int
+sshkey_from_blob_internal(const u_char *blob, size_t blen,
+ struct sshkey **keyp, int allow_cert)
+{
+ struct sshbuf *b = NULL;
+ int type, nid = -1, ret = SSH_ERR_INTERNAL_ERROR;
+ char *ktype = NULL, *curve = NULL;
+ struct sshkey *key = NULL;
+ size_t len;
+ u_char *pk = NULL;
+#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
+ EC_POINT *q = NULL;
+#endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */
+
+#ifdef DEBUG_PK /* XXX */
+ dump_base64(stderr, blob, blen);
+#endif
+ *keyp = NULL;
+ if ((b = sshbuf_from(blob, blen)) == NULL)
+ return SSH_ERR_ALLOC_FAIL;
+ if (sshbuf_get_cstring(b, &ktype, NULL) != 0) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+
+ type = sshkey_type_from_name(ktype);
+ if (sshkey_type_plain(type) == KEY_ECDSA)
+ nid = sshkey_ecdsa_nid_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:
+ if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ /* FALLTHROUGH */
+ case KEY_RSA:
+ case KEY_RSA_CERT_V00:
+ if ((key = sshkey_new(type)) == NULL) {
+ ret = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ if (sshbuf_get_bignum2(b, key->rsa->e) == -1 ||
+ sshbuf_get_bignum2(b, key->rsa->n) == -1) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+#ifdef DEBUG_PK
+ RSA_print_fp(stderr, key->rsa, 8);
+#endif
+ break;
+ case KEY_DSA_CERT:
+ if (sshbuf_get_string_direct(b, NULL, NULL) != 0) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ /* FALLTHROUGH */
+ case KEY_DSA:
+ case KEY_DSA_CERT_V00:
+ if ((key = sshkey_new(type)) == NULL) {
+ ret = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ if (sshbuf_get_bignum2(b, key->dsa->p) == -1 ||
+ sshbuf_get_bignum2(b, key->dsa->q) == -1 ||
+ sshbuf_get_bignum2(b, key->dsa->g) == -1 ||
+ sshbuf_get_bignum2(b, key->dsa->pub_key) == -1) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+#ifdef DEBUG_PK
+ DSA_print_fp(stderr, key->dsa, 8);
+#endif
+ break;
+ case KEY_ECDSA_CERT:
+ 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 = nid;
+ 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:
+ 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, blob, blen)) != 0)
+ goto out;
+
+ if (key != NULL && sshbuf_len(b) != 0) {
+ ret = SSH_ERR_INVALID_FORMAT;
+ goto out;
+ }
+ ret = 0;
+ *keyp = key;
+ key = NULL;
+ out:
+ sshbuf_free(b);
+ 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)
+{
+ return sshkey_from_blob_internal(blob, blen, keyp, 1);
+}
+
+int
+sshkey_sign(const struct sshkey *key,
+ u_char **sigp, size_t *lenp,
+ const u_char *data, size_t datalen, 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_V00:
+ 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_V00:
+ case KEY_RSA_CERT:
+ case KEY_RSA:
+ return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat);
+#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)
+ return -1;
+
+ if (dlen > SSH_KEY_MAX_SIGN_DATA_SIZE)
+ return SSH_ERR_INVALID_ARGUMENT;
+ switch (key->type) {
+#ifdef WITH_OPENSSL
+ case KEY_DSA_CERT_V00:
+ 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_V00:
+ case KEY_RSA_CERT:
+ case KEY_RSA:
+ return ssh_rsa_verify(key, sig, siglen, data, dlen, compat);
+#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;
+
+ if (dkp != NULL)
+ *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_V00:
+ 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_V00:
+ 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 legacy)
+{
+ int newtype;
+
+ switch (k->type) {
+#ifdef WITH_OPENSSL
+ case KEY_RSA:
+ newtype = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
+ break;
+ case KEY_DSA:
+ newtype = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
+ break;
+ case KEY_ECDSA:
+ if (legacy)
+ return SSH_ERR_INVALID_ARGUMENT;
+ newtype = KEY_ECDSA_CERT;
+ break;
+#endif /* WITH_OPENSSL */
+ case KEY_ED25519:
+ if (legacy)
+ return SSH_ERR_INVALID_ARGUMENT;
+ 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)
+{
+ 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 (!sshkey_cert_is_legacy(k)) {
+ 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_V00:
+ 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_V00:
+ 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;
+ }
+
+ /* -v01 certs have a serial number next */
+ if (!sshkey_cert_is_legacy(k)) {
+ if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0)
+ goto out;
+ }
+
+ if ((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)
+ goto out;
+
+ /* -v01 certs have non-critical options here */
+ if (!sshkey_cert_is_legacy(k)) {
+ if ((ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0)
+ goto out;
+ }
+
+ /* -v00 certs put the nonce at the end */
+ if (sshkey_cert_is_legacy(k)) {
+ if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
+ goto out;
+ }
+
+ if ((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), 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);
+ if (sig_blob != NULL)
+ free(sig_blob);
+ if (ca_blob != NULL)
+ free(ca_blob);
+ if (principals != NULL)
+ 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;
+}
+
+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_V00:
+ 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_V00:
+ 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;
+ const u_char *cert;
+ size_t len, 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_V00:
+ case KEY_DSA_CERT:
+ if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
+ (r = sshkey_from_blob(cert, len, &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 = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
+ (r = sshkey_from_blob(cert, len, &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_V00:
+ case KEY_RSA_CERT:
+ if ((r = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
+ (r = sshkey_from_blob(cert, len, &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 = sshbuf_get_string_direct(buf, &cert, &len)) != 0 ||
+ (r = sshkey_from_blob(cert, len, &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_V00:
+ 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;
+
+ 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, *b64 = NULL, *key = NULL, *pubkeyblob = NULL;
+ u_char salt[SALT_LEN];
+ size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
+ u_int check;
+ int r = SSH_ERR_INTERNAL_ERROR;
+ struct sshcipher_ctx ciphercontext;
+ const struct sshcipher *cipher;
+ const char *kdfname = KDFNAME;
+ struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL;
+
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
+
+ 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_cleanup(&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, slen = 0;
+ struct sshbuf *encoded = NULL, *decoded = NULL;
+ struct sshbuf *kdf = NULL, *decrypted = NULL;
+ struct sshcipher_ctx ciphercontext;
+ struct sshkey *k = NULL;
+ u_char *key = NULL, *salt = NULL, *dp, pad, last;
+ u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
+
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
+ 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, 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);
+ 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;
+ }
+ }
+
+ /* 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),
+ sshbuf_len(decoded), 0, cipher_authlen(cipher))) != 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)) != 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_cleanup(&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;
+ 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;
+ if ((r = cipher_cleanup(&ciphercontext)) != 0)
+ goto out;
+
+ r = sshbuf_putb(blob, encrypted);
+
+ out:
+ explicit_bzero(&ciphercontext, sizeof(ciphercontext));
+ explicit_bzero(buf, sizeof(buf));
+ if (buffer != NULL)
+ sshbuf_free(buffer);
+ if (encrypted != NULL)
+ 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_OPENSSL
+ case KEY_RSA1:
+ return sshkey_private_rsa1_to_blob(key, blob,
+ passphrase, comment);
+ 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;
+ else
+ sshkey_free(pub);
+ pub = NULL;
+
+ out:
+ if (copy != NULL)
+ sshbuf_free(copy);
+ if (pub != NULL)
+ 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;
+ const struct sshcipher *cipher;
+ struct sshkey *prv = 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) {
+ cipher_cleanup(&ciphercontext);
+ goto out;
+ }
+ if ((r = cipher_cleanup(&ciphercontext)) != 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;
+ *keyp = prv;
+ prv = NULL;
+ if (commentp != NULL) {
+ *commentp = comment;
+ comment = NULL;
+ }
+ out:
+ explicit_bzero(&ciphercontext, sizeof(ciphercontext));
+ if (comment != NULL)
+ free(comment);
+ if (prv != NULL)
+ sshkey_free(prv);
+ if (copy != NULL)
+ sshbuf_free(copy);
+ if (decrypted != NULL)
+ sshbuf_free(decrypted);
+ return r;
+}
+#endif /* WITH_SSH1 */
+
+#ifdef WITH_OPENSSL
+/* XXX make private once ssh-keysign.c fixed */
+int
+sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
+ const char *passphrase, struct sshkey **keyp, char **commentp)
+{
+ EVP_PKEY *pk = NULL;
+ struct sshkey *prv = NULL;
+ char *name = "<no key>";
+ BIO *bio = NULL;
+ int r;
+
+ *keyp = NULL;
+ if (commentp != NULL)
+ *commentp = 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;
+ name = "rsa w/o comment";
+#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;
+ name = "dsa w/o comment";
+#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;
+ }
+ name = "ecdsa w/o comment";
+# 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;
+ }
+ if (commentp != NULL &&
+ (*commentp = strdup(name)) == NULL) {
+ r = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ r = 0;
+ *keyp = prv;
+ prv = NULL;
+ out:
+ BIO_free(bio);
+ if (pk != NULL)
+ EVP_PKEY_free(pk);
+ if (prv != NULL)
+ sshkey_free(prv);
+ return r;
+}
+#endif /* WITH_OPENSSL */
+
+int
+sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
+ const char *passphrase, struct sshkey **keyp, char **commentp)
+{
+ int r;
+
+ *keyp = NULL;
+ if (commentp != NULL)
+ *commentp = NULL;
+
+ switch (type) {
+#ifdef WITH_OPENSSL
+ case KEY_RSA1:
+ return sshkey_parse_private_rsa1(blob, passphrase,
+ keyp, commentp);
+ case KEY_DSA:
+ case KEY_ECDSA:
+ case KEY_RSA:
+ return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
+ keyp, commentp);
+#endif /* WITH_OPENSSL */
+ case KEY_ED25519:
+ return sshkey_parse_private2(blob, type, passphrase,
+ keyp, commentp);
+ case KEY_UNSPEC:
+ if ((r = sshkey_parse_private2(blob, type, passphrase, keyp,
+ commentp)) == 0)
+ return 0;
+#ifdef WITH_OPENSSL
+ return sshkey_parse_private_pem_fileblob(blob, type, passphrase,
+ keyp, commentp);
+#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,
+ const char *filename, struct sshkey **keyp, char **commentp)
+{
+ int r;
+
+ 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 ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) {
+ return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1,
+ passphrase, keyp, commentp);
+ }
+#endif /* WITH_SSH1 */
+ if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
+ passphrase, keyp, commentp)) == 0)
+ return 0;
+ return r;
+}