| /* $OpenBSD: sshkey.c,v 1.81 2019/07/16 13:18:39 djm Exp $ */ |
| /* |
| * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
| * Copyright (c) 2008 Alexander von Gernler. All rights reserved. |
| * Copyright (c) 2010,2011 Damien Miller. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "includes.h" |
| |
| #include <sys/types.h> |
| #include <netinet/in.h> |
| |
| #ifdef WITH_OPENSSL |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/pem.h> |
| #endif |
| |
| #include "crypto_api.h" |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <resolv.h> |
| #ifdef HAVE_UTIL_H |
| #include <util.h> |
| #endif /* HAVE_UTIL_H */ |
| |
| #include "ssh2.h" |
| #include "ssherr.h" |
| #include "misc.h" |
| #include "sshbuf.h" |
| #include "cipher.h" |
| #include "digest.h" |
| #define SSHKEY_INTERNAL |
| #include "sshkey.h" |
| #include "match.h" |
| |
| #ifdef WITH_XMSS |
| #include "sshkey-xmss.h" |
| #include "xmss_fast.h" |
| #endif |
| |
| #include "openbsd-compat/openssl-compat.h" |
| |
| /* openssh private key file format */ |
| #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n" |
| #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n" |
| #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1) |
| #define MARK_END_LEN (sizeof(MARK_END) - 1) |
| #define KDFNAME "bcrypt" |
| #define AUTH_MAGIC "openssh-key-v1" |
| #define SALT_LEN 16 |
| #define DEFAULT_CIPHERNAME "aes256-ctr" |
| #define DEFAULT_ROUNDS 16 |
| |
| /* Version identification string for SSH v1 identity files. */ |
| #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n" |
| |
| /* |
| * Constants relating to "shielding" support; protection of keys expected |
| * to remain in memory for long durations |
| */ |
| #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024) |
| #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */ |
| #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512 |
| |
| int sshkey_private_serialize_opt(struct sshkey *key, |
| struct sshbuf *buf, enum sshkey_serialize_rep); |
| static int sshkey_from_blob_internal(struct sshbuf *buf, |
| struct sshkey **keyp, int allow_cert); |
| static int get_sigtype(const u_char *sig, size_t siglen, char **sigtypep); |
| |
| /* Supported key types */ |
| struct keytype { |
| const char *name; |
| const char *shortname; |
| const char *sigalg; |
| int type; |
| int nid; |
| int cert; |
| int sigonly; |
| }; |
| static const struct keytype keytypes[] = { |
| { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 }, |
| { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL, |
| KEY_ED25519_CERT, 0, 1, 0 }, |
| #ifdef WITH_XMSS |
| { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 }, |
| { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL, |
| KEY_XMSS_CERT, 0, 1, 0 }, |
| #endif /* WITH_XMSS */ |
| #ifdef WITH_OPENSSL |
| { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 }, |
| { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 }, |
| { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 }, |
| { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 }, |
| # ifdef OPENSSL_HAS_ECC |
| { "ecdsa-sha2-nistp256", "ECDSA", NULL, |
| KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 }, |
| { "ecdsa-sha2-nistp384", "ECDSA", NULL, |
| KEY_ECDSA, NID_secp384r1, 0, 0 }, |
| # ifdef OPENSSL_HAS_NISTP521 |
| { "ecdsa-sha2-nistp521", "ECDSA", NULL, |
| KEY_ECDSA, NID_secp521r1, 0, 0 }, |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| # endif /* OPENSSL_HAS_ECC */ |
| { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL, |
| KEY_RSA_CERT, 0, 1, 0 }, |
| { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT", |
| "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 }, |
| { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT", |
| "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 }, |
| { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL, |
| KEY_DSA_CERT, 0, 1, 0 }, |
| # ifdef OPENSSL_HAS_ECC |
| { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL, |
| KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 }, |
| { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL, |
| KEY_ECDSA_CERT, NID_secp384r1, 1, 0 }, |
| # ifdef OPENSSL_HAS_NISTP521 |
| { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL, |
| KEY_ECDSA_CERT, NID_secp521r1, 1, 0 }, |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| { NULL, NULL, NULL, -1, -1, 0, 0 } |
| }; |
| |
| const char * |
| sshkey_type(const struct sshkey *k) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type == k->type) |
| return kt->shortname; |
| } |
| return "unknown"; |
| } |
| |
| static const char * |
| sshkey_ssh_name_from_type_nid(int type, int nid) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type == type && (kt->nid == 0 || kt->nid == nid)) |
| return kt->name; |
| } |
| return "ssh-unknown"; |
| } |
| |
| int |
| sshkey_type_is_cert(int type) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type == type) |
| return kt->cert; |
| } |
| return 0; |
| } |
| |
| const char * |
| sshkey_ssh_name(const struct sshkey *k) |
| { |
| return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid); |
| } |
| |
| const char * |
| sshkey_ssh_name_plain(const struct sshkey *k) |
| { |
| return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type), |
| k->ecdsa_nid); |
| } |
| |
| int |
| sshkey_type_from_name(const char *name) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| /* Only allow shortname matches for plain key types */ |
| if ((kt->name != NULL && strcmp(name, kt->name) == 0) || |
| (!kt->cert && strcasecmp(kt->shortname, name) == 0)) |
| return kt->type; |
| } |
| return KEY_UNSPEC; |
| } |
| |
| int |
| sshkey_ecdsa_nid_from_name(const char *name) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT) |
| continue; |
| if (kt->name != NULL && strcmp(name, kt->name) == 0) |
| return kt->nid; |
| } |
| return -1; |
| } |
| |
| char * |
| sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep) |
| { |
| char *tmp, *ret = NULL; |
| size_t nlen, rlen = 0; |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->name == NULL) |
| continue; |
| if (!include_sigonly && kt->sigonly) |
| continue; |
| if ((certs_only && !kt->cert) || (plain_only && kt->cert)) |
| continue; |
| if (ret != NULL) |
| ret[rlen++] = sep; |
| nlen = strlen(kt->name); |
| if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) { |
| free(ret); |
| return NULL; |
| } |
| ret = tmp; |
| memcpy(ret + rlen, kt->name, nlen + 1); |
| rlen += nlen; |
| } |
| return ret; |
| } |
| |
| int |
| sshkey_names_valid2(const char *names, int allow_wildcard) |
| { |
| char *s, *cp, *p; |
| const struct keytype *kt; |
| int type; |
| |
| if (names == NULL || strcmp(names, "") == 0) |
| return 0; |
| if ((s = cp = strdup(names)) == NULL) |
| return 0; |
| for ((p = strsep(&cp, ",")); p && *p != '\0'; |
| (p = strsep(&cp, ","))) { |
| type = sshkey_type_from_name(p); |
| if (type == KEY_UNSPEC) { |
| if (allow_wildcard) { |
| /* |
| * Try matching key types against the string. |
| * If any has a positive or negative match then |
| * the component is accepted. |
| */ |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (match_pattern_list(kt->name, |
| p, 0) != 0) |
| break; |
| } |
| if (kt->type != -1) |
| continue; |
| } |
| free(s); |
| return 0; |
| } |
| } |
| free(s); |
| return 1; |
| } |
| |
| u_int |
| sshkey_size(const struct sshkey *k) |
| { |
| #ifdef WITH_OPENSSL |
| const BIGNUM *rsa_n, *dsa_p; |
| #endif /* WITH_OPENSSL */ |
| |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| if (k->rsa == NULL) |
| return 0; |
| RSA_get0_key(k->rsa, &rsa_n, NULL, NULL); |
| return BN_num_bits(rsa_n); |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| if (k->dsa == NULL) |
| return 0; |
| DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL); |
| return BN_num_bits(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: |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| return 256; /* XXX */ |
| } |
| return 0; |
| } |
| |
| static int |
| sshkey_type_is_valid_ca(int type) |
| { |
| switch (type) { |
| case KEY_RSA: |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_ED25519: |
| case KEY_XMSS: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| int |
| sshkey_is_cert(const struct sshkey *k) |
| { |
| if (k == NULL) |
| return 0; |
| return sshkey_type_is_cert(k->type); |
| } |
| |
| /* Return the cert-less equivalent to a certified key type */ |
| int |
| sshkey_type_plain(int type) |
| { |
| switch (type) { |
| case KEY_RSA_CERT: |
| return KEY_RSA; |
| case KEY_DSA_CERT: |
| return KEY_DSA; |
| case KEY_ECDSA_CERT: |
| return KEY_ECDSA; |
| case KEY_ED25519_CERT: |
| return KEY_ED25519; |
| case KEY_XMSS_CERT: |
| return KEY_XMSS; |
| default: |
| return type; |
| } |
| } |
| |
| #ifdef WITH_OPENSSL |
| /* XXX: these are really begging for a table-driven approach */ |
| int |
| sshkey_curve_name_to_nid(const char *name) |
| { |
| if (strcmp(name, "nistp256") == 0) |
| return NID_X9_62_prime256v1; |
| else if (strcmp(name, "nistp384") == 0) |
| return NID_secp384r1; |
| # ifdef OPENSSL_HAS_NISTP521 |
| else if (strcmp(name, "nistp521") == 0) |
| return NID_secp521r1; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| else |
| return -1; |
| } |
| |
| u_int |
| sshkey_curve_nid_to_bits(int nid) |
| { |
| switch (nid) { |
| case NID_X9_62_prime256v1: |
| return 256; |
| case NID_secp384r1: |
| return 384; |
| # ifdef OPENSSL_HAS_NISTP521 |
| case NID_secp521r1: |
| return 521; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| default: |
| return 0; |
| } |
| } |
| |
| int |
| sshkey_ecdsa_bits_to_nid(int bits) |
| { |
| switch (bits) { |
| case 256: |
| return NID_X9_62_prime256v1; |
| case 384: |
| return NID_secp384r1; |
| # ifdef OPENSSL_HAS_NISTP521 |
| case 521: |
| return NID_secp521r1; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| default: |
| return -1; |
| } |
| } |
| |
| const char * |
| sshkey_curve_nid_to_name(int nid) |
| { |
| switch (nid) { |
| case NID_X9_62_prime256v1: |
| return "nistp256"; |
| case NID_secp384r1: |
| return "nistp384"; |
| # ifdef OPENSSL_HAS_NISTP521 |
| case NID_secp521r1: |
| return "nistp521"; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| default: |
| return NULL; |
| } |
| } |
| |
| int |
| sshkey_ec_nid_to_hash_alg(int nid) |
| { |
| int kbits = sshkey_curve_nid_to_bits(nid); |
| |
| if (kbits <= 0) |
| return -1; |
| |
| /* RFC5656 section 6.2.1 */ |
| if (kbits <= 256) |
| return SSH_DIGEST_SHA256; |
| else if (kbits <= 384) |
| return SSH_DIGEST_SHA384; |
| else |
| return SSH_DIGEST_SHA512; |
| } |
| #endif /* WITH_OPENSSL */ |
| |
| static void |
| cert_free(struct sshkey_cert *cert) |
| { |
| u_int i; |
| |
| if (cert == NULL) |
| return; |
| sshbuf_free(cert->certblob); |
| sshbuf_free(cert->critical); |
| sshbuf_free(cert->extensions); |
| free(cert->key_id); |
| for (i = 0; i < cert->nprincipals; i++) |
| free(cert->principals[i]); |
| free(cert->principals); |
| sshkey_free(cert->signature_key); |
| free(cert->signature_type); |
| freezero(cert, sizeof(*cert)); |
| } |
| |
| static struct sshkey_cert * |
| cert_new(void) |
| { |
| struct sshkey_cert *cert; |
| |
| if ((cert = calloc(1, sizeof(*cert))) == NULL) |
| return NULL; |
| if ((cert->certblob = sshbuf_new()) == NULL || |
| (cert->critical = sshbuf_new()) == NULL || |
| (cert->extensions = sshbuf_new()) == NULL) { |
| cert_free(cert); |
| return NULL; |
| } |
| cert->key_id = NULL; |
| cert->principals = NULL; |
| cert->signature_key = NULL; |
| cert->signature_type = NULL; |
| return cert; |
| } |
| |
| struct sshkey * |
| sshkey_new(int type) |
| { |
| struct sshkey *k; |
| #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; |
| k->xmss_sk = NULL; |
| k->xmss_pk = NULL; |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| if ((rsa = RSA_new()) == NULL) { |
| free(k); |
| return NULL; |
| } |
| k->rsa = rsa; |
| break; |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| if ((dsa = DSA_new()) == NULL) { |
| 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: |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| /* no need to prealloc */ |
| break; |
| case KEY_UNSPEC: |
| break; |
| default: |
| free(k); |
| return NULL; |
| } |
| |
| if (sshkey_is_cert(k)) { |
| if ((k->cert = cert_new()) == NULL) { |
| sshkey_free(k); |
| return NULL; |
| } |
| } |
| |
| return k; |
| } |
| |
| void |
| sshkey_free(struct sshkey *k) |
| { |
| if (k == NULL) |
| return; |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| RSA_free(k->rsa); |
| k->rsa = NULL; |
| break; |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| DSA_free(k->dsa); |
| k->dsa = NULL; |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| case KEY_ECDSA_CERT: |
| EC_KEY_free(k->ecdsa); |
| k->ecdsa = NULL; |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| freezero(k->ed25519_pk, ED25519_PK_SZ); |
| k->ed25519_pk = NULL; |
| freezero(k->ed25519_sk, ED25519_SK_SZ); |
| k->ed25519_sk = NULL; |
| break; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| freezero(k->xmss_pk, sshkey_xmss_pklen(k)); |
| k->xmss_pk = NULL; |
| freezero(k->xmss_sk, sshkey_xmss_sklen(k)); |
| k->xmss_sk = NULL; |
| sshkey_xmss_free_state(k); |
| free(k->xmss_name); |
| k->xmss_name = NULL; |
| free(k->xmss_filename); |
| k->xmss_filename = NULL; |
| break; |
| #endif /* WITH_XMSS */ |
| case KEY_UNSPEC: |
| break; |
| default: |
| break; |
| } |
| if (sshkey_is_cert(k)) |
| cert_free(k->cert); |
| freezero(k->shielded_private, k->shielded_len); |
| freezero(k->shield_prekey, k->shield_prekey_len); |
| freezero(k, sizeof(*k)); |
| } |
| |
| static int |
| cert_compare(struct sshkey_cert *a, struct sshkey_cert *b) |
| { |
| if (a == NULL && b == NULL) |
| return 1; |
| if (a == NULL || b == NULL) |
| return 0; |
| if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob)) |
| return 0; |
| if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob), |
| sshbuf_len(a->certblob)) != 0) |
| return 0; |
| return 1; |
| } |
| |
| /* |
| * Compare public portions of key only, allowing comparisons between |
| * certificates and plain keys too. |
| */ |
| int |
| sshkey_equal_public(const struct sshkey *a, const struct sshkey *b) |
| { |
| #if defined(WITH_OPENSSL) |
| const BIGNUM *rsa_e_a, *rsa_n_a; |
| const BIGNUM *rsa_e_b, *rsa_n_b; |
| const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a; |
| const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b; |
| # if defined(OPENSSL_HAS_ECC) |
| BN_CTX *bnctx; |
| # endif /* OPENSSL_HAS_ECC */ |
| #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_RSA_CERT: |
| case KEY_RSA: |
| if (a->rsa == NULL || b->rsa == NULL) |
| return 0; |
| RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL); |
| RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL); |
| return BN_cmp(rsa_e_a, rsa_e_b) == 0 && |
| BN_cmp(rsa_n_a, rsa_n_b) == 0; |
| case KEY_DSA_CERT: |
| case KEY_DSA: |
| if (a->dsa == NULL || b->dsa == NULL) |
| return 0; |
| DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a); |
| DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b); |
| DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL); |
| DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL); |
| return BN_cmp(dsa_p_a, dsa_p_b) == 0 && |
| BN_cmp(dsa_q_a, dsa_q_b) == 0 && |
| BN_cmp(dsa_g_a, dsa_g_b) == 0 && |
| BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 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; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| return a->xmss_pk != NULL && b->xmss_pk != NULL && |
| sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) && |
| memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0; |
| #endif /* WITH_XMSS */ |
| 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, |
| enum sshkey_serialize_rep opts) |
| { |
| int type, ret = SSH_ERR_INTERNAL_ERROR; |
| const char *typename; |
| #ifdef WITH_OPENSSL |
| const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; |
| #endif /* WITH_OPENSSL */ |
| |
| if (key == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| |
| if (sshkey_is_cert(key)) { |
| if (key->cert == NULL) |
| return SSH_ERR_EXPECTED_CERT; |
| if (sshbuf_len(key->cert->certblob) == 0) |
| return SSH_ERR_KEY_LACKS_CERTBLOB; |
| } |
| type = force_plain ? sshkey_type_plain(key->type) : key->type; |
| typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid); |
| |
| switch (type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| case KEY_ECDSA_CERT: |
| case KEY_RSA_CERT: |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519_CERT: |
| #ifdef WITH_XMSS |
| case KEY_XMSS_CERT: |
| #endif /* WITH_XMSS */ |
| /* 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; |
| DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g); |
| DSA_get0_key(key->dsa, &dsa_pub_key, NULL); |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 || |
| (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 || |
| (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 || |
| (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0) |
| return ret; |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if (key->ecdsa == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_cstring(b, |
| sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || |
| (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0) |
| return ret; |
| break; |
| # endif |
| case KEY_RSA: |
| if (key->rsa == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL); |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 || |
| (ret = sshbuf_put_bignum2(b, 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; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| if (key->xmss_name == NULL || key->xmss_pk == NULL || |
| sshkey_xmss_pklen(key) == 0) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 || |
| (ret = sshbuf_put_string(b, |
| key->xmss_pk, sshkey_xmss_pklen(key))) != 0 || |
| (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0) |
| return ret; |
| break; |
| #endif /* WITH_XMSS */ |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| return 0; |
| } |
| |
| int |
| sshkey_putb(const struct sshkey *key, struct sshbuf *b) |
| { |
| return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT); |
| } |
| |
| int |
| sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b, |
| enum sshkey_serialize_rep opts) |
| { |
| struct sshbuf *tmp; |
| int r; |
| |
| if ((tmp = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| r = to_blob_buf(key, tmp, 0, opts); |
| if (r == 0) |
| r = sshbuf_put_stringb(b, tmp); |
| sshbuf_free(tmp); |
| return r; |
| } |
| |
| int |
| sshkey_puts(const struct sshkey *key, struct sshbuf *b) |
| { |
| return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT); |
| } |
| |
| int |
| sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b) |
| { |
| return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT); |
| } |
| |
| static int |
| to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain, |
| enum sshkey_serialize_rep opts) |
| { |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| size_t len; |
| struct sshbuf *b = NULL; |
| |
| if (lenp != NULL) |
| *lenp = 0; |
| if (blobp != NULL) |
| *blobp = NULL; |
| if ((b = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0) |
| goto out; |
| len = sshbuf_len(b); |
| if (lenp != NULL) |
| *lenp = len; |
| if (blobp != NULL) { |
| if ((*blobp = malloc(len)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| memcpy(*blobp, sshbuf_ptr(b), len); |
| } |
| ret = 0; |
| out: |
| sshbuf_free(b); |
| return ret; |
| } |
| |
| int |
| sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) |
| { |
| return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT); |
| } |
| |
| int |
| sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) |
| { |
| return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT); |
| } |
| |
| int |
| sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg, |
| u_char **retp, size_t *lenp) |
| { |
| u_char *blob = NULL, *ret = NULL; |
| size_t blob_len = 0; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| if (retp != NULL) |
| *retp = NULL; |
| if (lenp != NULL) |
| *lenp = 0; |
| if (ssh_digest_bytes(dgst_alg) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT)) |
| != 0) |
| goto out; |
| if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = ssh_digest_memory(dgst_alg, blob, blob_len, |
| ret, SSH_DIGEST_MAX_LENGTH)) != 0) |
| goto out; |
| /* success */ |
| if (retp != NULL) { |
| *retp = ret; |
| ret = NULL; |
| } |
| if (lenp != NULL) |
| *lenp = ssh_digest_bytes(dgst_alg); |
| r = 0; |
| out: |
| free(ret); |
| if (blob != NULL) { |
| explicit_bzero(blob, blob_len); |
| free(blob); |
| } |
| return r; |
| } |
| |
| static char * |
| fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) |
| { |
| char *ret; |
| size_t plen = strlen(alg) + 1; |
| size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1; |
| |
| if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL) |
| return NULL; |
| strlcpy(ret, alg, rlen); |
| strlcat(ret, ":", rlen); |
| if (dgst_raw_len == 0) |
| return ret; |
| if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) { |
| freezero(ret, rlen); |
| return NULL; |
| } |
| /* Trim padding characters from end */ |
| ret[strcspn(ret, "=")] = '\0'; |
| return ret; |
| } |
| |
| static char * |
| fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) |
| { |
| char *retval, hex[5]; |
| size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2; |
| |
| if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL) |
| return NULL; |
| strlcpy(retval, alg, rlen); |
| strlcat(retval, ":", rlen); |
| for (i = 0; i < dgst_raw_len; i++) { |
| snprintf(hex, sizeof(hex), "%s%02x", |
| i > 0 ? ":" : "", dgst_raw[i]); |
| strlcat(retval, hex, rlen); |
| } |
| return retval; |
| } |
| |
| static char * |
| fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len) |
| { |
| char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; |
| char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', |
| 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; |
| u_int i, j = 0, rounds, seed = 1; |
| char *retval; |
| |
| rounds = (dgst_raw_len / 2) + 1; |
| if ((retval = calloc(rounds, 6)) == NULL) |
| return NULL; |
| retval[j++] = 'x'; |
| for (i = 0; i < rounds; i++) { |
| u_int idx0, idx1, idx2, idx3, idx4; |
| if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
| idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + |
| seed) % 6; |
| idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
| idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + |
| (seed / 6)) % 6; |
| retval[j++] = vowels[idx0]; |
| retval[j++] = consonants[idx1]; |
| retval[j++] = vowels[idx2]; |
| if ((i + 1) < rounds) { |
| idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; |
| idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; |
| retval[j++] = consonants[idx3]; |
| retval[j++] = '-'; |
| retval[j++] = consonants[idx4]; |
| seed = ((seed * 5) + |
| ((((u_int)(dgst_raw[2 * i])) * 7) + |
| ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; |
| } |
| } else { |
| idx0 = seed % 6; |
| idx1 = 16; |
| idx2 = seed / 6; |
| retval[j++] = vowels[idx0]; |
| retval[j++] = consonants[idx1]; |
| retval[j++] = vowels[idx2]; |
| } |
| } |
| retval[j++] = 'x'; |
| retval[j++] = '\0'; |
| return retval; |
| } |
| |
| /* |
| * Draw an ASCII-Art representing the fingerprint so human brain can |
| * profit from its built-in pattern recognition ability. |
| * This technique is called "random art" and can be found in some |
| * scientific publications like this original paper: |
| * |
| * "Hash Visualization: a New Technique to improve Real-World Security", |
| * Perrig A. and Song D., 1999, International Workshop on Cryptographic |
| * Techniques and E-Commerce (CrypTEC '99) |
| * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf |
| * |
| * The subject came up in a talk by Dan Kaminsky, too. |
| * |
| * If you see the picture is different, the key is different. |
| * If the picture looks the same, you still know nothing. |
| * |
| * The algorithm used here is a worm crawling over a discrete plane, |
| * leaving a trace (augmenting the field) everywhere it goes. |
| * Movement is taken from dgst_raw 2bit-wise. Bumping into walls |
| * makes the respective movement vector be ignored for this turn. |
| * Graphs are not unambiguous, because circles in graphs can be |
| * walked in either direction. |
| */ |
| |
| /* |
| * Field sizes for the random art. Have to be odd, so the starting point |
| * can be in the exact middle of the picture, and FLDBASE should be >=8 . |
| * Else pictures would be too dense, and drawing the frame would |
| * fail, too, because the key type would not fit in anymore. |
| */ |
| #define FLDBASE 8 |
| #define FLDSIZE_Y (FLDBASE + 1) |
| #define FLDSIZE_X (FLDBASE * 2 + 1) |
| static char * |
| fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len, |
| const struct sshkey *k) |
| { |
| /* |
| * Chars to be used after each other every time the worm |
| * intersects with itself. Matter of taste. |
| */ |
| char *augmentation_string = " .o+=*BOX@%&#/^SE"; |
| char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X]; |
| u_char field[FLDSIZE_X][FLDSIZE_Y]; |
| size_t i, tlen, hlen; |
| u_int b; |
| int x, y, r; |
| size_t len = strlen(augmentation_string) - 1; |
| |
| if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL) |
| return NULL; |
| |
| /* initialize field */ |
| memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); |
| x = FLDSIZE_X / 2; |
| y = FLDSIZE_Y / 2; |
| |
| /* process raw key */ |
| for (i = 0; i < dgst_raw_len; i++) { |
| int input; |
| /* each byte conveys four 2-bit move commands */ |
| input = dgst_raw[i]; |
| for (b = 0; b < 4; b++) { |
| /* evaluate 2 bit, rest is shifted later */ |
| x += (input & 0x1) ? 1 : -1; |
| y += (input & 0x2) ? 1 : -1; |
| |
| /* assure we are still in bounds */ |
| x = MAXIMUM(x, 0); |
| y = MAXIMUM(y, 0); |
| x = MINIMUM(x, FLDSIZE_X - 1); |
| y = MINIMUM(y, FLDSIZE_Y - 1); |
| |
| /* augment the field */ |
| if (field[x][y] < len - 2) |
| field[x][y]++; |
| input = input >> 2; |
| } |
| } |
| |
| /* mark starting point and end point*/ |
| field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; |
| field[x][y] = len; |
| |
| /* assemble title */ |
| r = snprintf(title, sizeof(title), "[%s %u]", |
| sshkey_type(k), sshkey_size(k)); |
| /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */ |
| if (r < 0 || r > (int)sizeof(title)) |
| r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k)); |
| tlen = (r <= 0) ? 0 : strlen(title); |
| |
| /* assemble hash ID. */ |
| r = snprintf(hash, sizeof(hash), "[%s]", alg); |
| hlen = (r <= 0) ? 0 : strlen(hash); |
| |
| /* output upper border */ |
| p = retval; |
| *p++ = '+'; |
| for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++) |
| *p++ = '-'; |
| memcpy(p, title, tlen); |
| p += tlen; |
| for (i += tlen; i < FLDSIZE_X; i++) |
| *p++ = '-'; |
| *p++ = '+'; |
| *p++ = '\n'; |
| |
| /* output content */ |
| for (y = 0; y < FLDSIZE_Y; y++) { |
| *p++ = '|'; |
| for (x = 0; x < FLDSIZE_X; x++) |
| *p++ = augmentation_string[MINIMUM(field[x][y], len)]; |
| *p++ = '|'; |
| *p++ = '\n'; |
| } |
| |
| /* output lower border */ |
| *p++ = '+'; |
| for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++) |
| *p++ = '-'; |
| memcpy(p, hash, hlen); |
| p += hlen; |
| for (i += hlen; i < FLDSIZE_X; i++) |
| *p++ = '-'; |
| *p++ = '+'; |
| |
| return retval; |
| } |
| |
| char * |
| sshkey_fingerprint(const struct sshkey *k, int dgst_alg, |
| enum sshkey_fp_rep dgst_rep) |
| { |
| char *retval = NULL; |
| u_char *dgst_raw; |
| size_t dgst_raw_len; |
| |
| if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0) |
| return NULL; |
| switch (dgst_rep) { |
| case SSH_FP_DEFAULT: |
| if (dgst_alg == SSH_DIGEST_MD5) { |
| retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| } else { |
| retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| } |
| break; |
| case SSH_FP_HEX: |
| retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| break; |
| case SSH_FP_BASE64: |
| retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| break; |
| case SSH_FP_BUBBLEBABBLE: |
| retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len); |
| break; |
| case SSH_FP_RANDOMART: |
| retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len, k); |
| break; |
| default: |
| explicit_bzero(dgst_raw, dgst_raw_len); |
| free(dgst_raw); |
| return NULL; |
| } |
| explicit_bzero(dgst_raw, dgst_raw_len); |
| free(dgst_raw); |
| return retval; |
| } |
| |
| static int |
| peek_type_nid(const char *s, size_t l, int *nid) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->name == NULL || strlen(kt->name) != l) |
| continue; |
| if (memcmp(s, kt->name, l) == 0) { |
| *nid = -1; |
| if (kt->type == KEY_ECDSA || kt->type == KEY_ECDSA_CERT) |
| *nid = kt->nid; |
| return kt->type; |
| } |
| } |
| return KEY_UNSPEC; |
| } |
| |
| /* XXX this can now be made const char * */ |
| int |
| sshkey_read(struct sshkey *ret, char **cpp) |
| { |
| struct sshkey *k; |
| char *cp, *blobcopy; |
| size_t space; |
| int r, type, curve_nid = -1; |
| struct sshbuf *blob; |
| |
| if (ret == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| |
| switch (ret->type) { |
| case KEY_UNSPEC: |
| case KEY_RSA: |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_ED25519: |
| case KEY_DSA_CERT: |
| case KEY_ECDSA_CERT: |
| case KEY_RSA_CERT: |
| case KEY_ED25519_CERT: |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| #endif /* WITH_XMSS */ |
| break; /* ok */ |
| default: |
| return SSH_ERR_INVALID_ARGUMENT; |
| } |
| |
| /* Decode type */ |
| cp = *cpp; |
| space = strcspn(cp, " \t"); |
| if (space == strlen(cp)) |
| return SSH_ERR_INVALID_FORMAT; |
| if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC) |
| return SSH_ERR_INVALID_FORMAT; |
| |
| /* skip whitespace */ |
| for (cp += space; *cp == ' ' || *cp == '\t'; cp++) |
| ; |
| if (*cp == '\0') |
| return SSH_ERR_INVALID_FORMAT; |
| if (ret->type != KEY_UNSPEC && ret->type != type) |
| return SSH_ERR_KEY_TYPE_MISMATCH; |
| if ((blob = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| |
| /* find end of keyblob and decode */ |
| space = strcspn(cp, " \t"); |
| if ((blobcopy = strndup(cp, space)) == NULL) { |
| sshbuf_free(blob); |
| return SSH_ERR_ALLOC_FAIL; |
| } |
| if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) { |
| free(blobcopy); |
| sshbuf_free(blob); |
| return r; |
| } |
| free(blobcopy); |
| if ((r = sshkey_fromb(blob, &k)) != 0) { |
| sshbuf_free(blob); |
| return r; |
| } |
| sshbuf_free(blob); |
| |
| /* skip whitespace and leave cp at start of comment */ |
| for (cp += space; *cp == ' ' || *cp == '\t'; cp++) |
| ; |
| |
| /* ensure type of blob matches type at start of line */ |
| if (k->type != type) { |
| sshkey_free(k); |
| return SSH_ERR_KEY_TYPE_MISMATCH; |
| } |
| if (sshkey_type_plain(type) == KEY_ECDSA && curve_nid != k->ecdsa_nid) { |
| sshkey_free(k); |
| return SSH_ERR_EC_CURVE_MISMATCH; |
| } |
| |
| /* Fill in ret from parsed key */ |
| ret->type = type; |
| if (sshkey_is_cert(ret)) { |
| if (!sshkey_is_cert(k)) { |
| sshkey_free(k); |
| return SSH_ERR_EXPECTED_CERT; |
| } |
| if (ret->cert != NULL) |
| cert_free(ret->cert); |
| ret->cert = k->cert; |
| k->cert = NULL; |
| } |
| switch (sshkey_type_plain(ret->type)) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| RSA_free(ret->rsa); |
| ret->rsa = k->rsa; |
| k->rsa = NULL; |
| #ifdef DEBUG_PK |
| RSA_print_fp(stderr, ret->rsa, 8); |
| #endif |
| break; |
| case KEY_DSA: |
| DSA_free(ret->dsa); |
| ret->dsa = k->dsa; |
| k->dsa = NULL; |
| #ifdef DEBUG_PK |
| DSA_print_fp(stderr, ret->dsa, 8); |
| #endif |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| EC_KEY_free(ret->ecdsa); |
| ret->ecdsa = k->ecdsa; |
| ret->ecdsa_nid = k->ecdsa_nid; |
| k->ecdsa = NULL; |
| k->ecdsa_nid = -1; |
| #ifdef DEBUG_PK |
| sshkey_dump_ec_key(ret->ecdsa); |
| #endif |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| freezero(ret->ed25519_pk, ED25519_PK_SZ); |
| ret->ed25519_pk = k->ed25519_pk; |
| k->ed25519_pk = NULL; |
| #ifdef DEBUG_PK |
| /* XXX */ |
| #endif |
| break; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| free(ret->xmss_pk); |
| ret->xmss_pk = k->xmss_pk; |
| k->xmss_pk = NULL; |
| free(ret->xmss_state); |
| ret->xmss_state = k->xmss_state; |
| k->xmss_state = NULL; |
| free(ret->xmss_name); |
| ret->xmss_name = k->xmss_name; |
| k->xmss_name = NULL; |
| free(ret->xmss_filename); |
| ret->xmss_filename = k->xmss_filename; |
| k->xmss_filename = NULL; |
| #ifdef DEBUG_PK |
| /* XXX */ |
| #endif |
| break; |
| #endif /* WITH_XMSS */ |
| default: |
| sshkey_free(k); |
| return SSH_ERR_INTERNAL_ERROR; |
| } |
| sshkey_free(k); |
| |
| /* success */ |
| *cpp = cp; |
| return 0; |
| } |
| |
| |
| int |
| sshkey_to_base64(const struct sshkey *key, char **b64p) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| struct sshbuf *b = NULL; |
| char *uu = NULL; |
| |
| if (b64p != NULL) |
| *b64p = NULL; |
| if ((b = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((r = sshkey_putb(key, b)) != 0) |
| goto out; |
| if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| /* Success */ |
| if (b64p != NULL) { |
| *b64p = uu; |
| uu = NULL; |
| } |
| r = 0; |
| out: |
| sshbuf_free(b); |
| free(uu); |
| return r; |
| } |
| |
| int |
| sshkey_format_text(const struct sshkey *key, struct sshbuf *b) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| char *uu = NULL; |
| |
| if ((r = sshkey_to_base64(key, &uu)) != 0) |
| goto out; |
| if ((r = sshbuf_putf(b, "%s %s", |
| sshkey_ssh_name(key), uu)) != 0) |
| goto out; |
| r = 0; |
| out: |
| free(uu); |
| return r; |
| } |
| |
| int |
| sshkey_write(const struct sshkey *key, FILE *f) |
| { |
| struct sshbuf *b = NULL; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| if ((b = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((r = sshkey_format_text(key, b)) != 0) |
| goto out; |
| if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) { |
| if (feof(f)) |
| errno = EPIPE; |
| r = SSH_ERR_SYSTEM_ERROR; |
| goto out; |
| } |
| /* Success */ |
| r = 0; |
| out: |
| sshbuf_free(b); |
| return r; |
| } |
| |
| const char * |
| sshkey_cert_type(const struct sshkey *k) |
| { |
| switch (k->cert->type) { |
| case SSH2_CERT_TYPE_USER: |
| return "user"; |
| case SSH2_CERT_TYPE_HOST: |
| return "host"; |
| default: |
| return "unknown"; |
| } |
| } |
| |
| #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) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE || |
| bits > SSHBUF_MAX_BIGNUM * 8) |
| return SSH_ERR_KEY_LENGTH; |
| *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: |
| RSA_free(private); |
| 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) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if (bits != 1024) |
| return SSH_ERR_KEY_LENGTH; |
| if ((private = DSA_new()) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| *dsap = NULL; |
| if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL, |
| NULL, NULL) || !DSA_generate_key(private)) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| *dsap = private; |
| private = NULL; |
| ret = 0; |
| out: |
| 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) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1) |
| return SSH_ERR_KEY_LENGTH; |
| *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: |
| 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_XMSS |
| case KEY_XMSS: |
| ret = sshkey_xmss_generate_private_key(k, bits); |
| break; |
| #endif /* WITH_XMSS */ |
| #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: |
| 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 r = SSH_ERR_INTERNAL_ERROR; |
| |
| if (to_key == NULL || (from = from_key->cert) == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| |
| if ((to = cert_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| |
| if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 || |
| (r = sshbuf_putb(to->critical, from->critical)) != 0 || |
| (r = sshbuf_putb(to->extensions, from->extensions)) != 0) |
| goto out; |
| |
| to->serial = from->serial; |
| to->type = from->type; |
| if (from->key_id == NULL) |
| to->key_id = NULL; |
| else if ((to->key_id = strdup(from->key_id)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| to->valid_after = from->valid_after; |
| to->valid_before = from->valid_before; |
| if (from->signature_key == NULL) |
| to->signature_key = NULL; |
| else if ((r = sshkey_from_private(from->signature_key, |
| &to->signature_key)) != 0) |
| goto out; |
| if (from->signature_type != NULL && |
| (to->signature_type = strdup(from->signature_type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if (from->nprincipals > 0) { |
| if ((to->principals = calloc(from->nprincipals, |
| sizeof(*to->principals))) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| for (i = 0; i < from->nprincipals; i++) { |
| to->principals[i] = strdup(from->principals[i]); |
| if (to->principals[i] == NULL) { |
| to->nprincipals = i; |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| } |
| } |
| to->nprincipals = from->nprincipals; |
| |
| /* success */ |
| cert_free(to_key->cert); |
| to_key->cert = to; |
| to = NULL; |
| r = 0; |
| out: |
| cert_free(to); |
| return r; |
| } |
| |
| int |
| sshkey_from_private(const struct sshkey *k, struct sshkey **pkp) |
| { |
| struct sshkey *n = NULL; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| #ifdef WITH_OPENSSL |
| const BIGNUM *rsa_n, *rsa_e; |
| BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL; |
| const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; |
| BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL; |
| BIGNUM *dsa_pub_key_dup = NULL; |
| #endif /* WITH_OPENSSL */ |
| |
| *pkp = NULL; |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g); |
| DSA_get0_key(k->dsa, &dsa_pub_key, NULL); |
| if ((dsa_p_dup = BN_dup(dsa_p)) == NULL || |
| (dsa_q_dup = BN_dup(dsa_q)) == NULL || |
| (dsa_g_dup = BN_dup(dsa_g)) == NULL || |
| (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */ |
| if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| dsa_pub_key_dup = NULL; /* transferred */ |
| |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| case KEY_ECDSA_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| n->ecdsa_nid = k->ecdsa_nid; |
| n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); |
| if (n->ecdsa == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (EC_KEY_set_public_key(n->ecdsa, |
| EC_KEY_get0_public_key(k->ecdsa)) != 1) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL); |
| if ((rsa_n_dup = BN_dup(rsa_n)) == NULL || |
| (rsa_e_dup = BN_dup(rsa_e)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| rsa_n_dup = rsa_e_dup = NULL; /* transferred */ |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (k->ed25519_pk != NULL) { |
| if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); |
| } |
| break; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0) |
| goto out; |
| if (k->xmss_pk != NULL) { |
| size_t pklen = sshkey_xmss_pklen(k); |
| if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) { |
| r = SSH_ERR_INTERNAL_ERROR; |
| goto out; |
| } |
| if ((n->xmss_pk = malloc(pklen)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| memcpy(n->xmss_pk, k->xmss_pk, pklen); |
| } |
| break; |
| #endif /* WITH_XMSS */ |
| default: |
| r = SSH_ERR_KEY_TYPE_UNKNOWN; |
| goto out; |
| } |
| if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0) |
| goto out; |
| /* success */ |
| *pkp = n; |
| n = NULL; |
| r = 0; |
| out: |
| sshkey_free(n); |
| #ifdef WITH_OPENSSL |
| BN_clear_free(rsa_n_dup); |
| BN_clear_free(rsa_e_dup); |
| BN_clear_free(dsa_p_dup); |
| BN_clear_free(dsa_q_dup); |
| BN_clear_free(dsa_g_dup); |
| BN_clear_free(dsa_pub_key_dup); |
| #endif |
| |
| return r; |
| } |
| |
| int |
| sshkey_is_shielded(struct sshkey *k) |
| { |
| return k != NULL && k->shielded_private != NULL; |
| } |
| |
| int |
| sshkey_shield_private(struct sshkey *k) |
| { |
| struct sshbuf *prvbuf = NULL; |
| u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH]; |
| struct sshcipher_ctx *cctx = NULL; |
| const struct sshcipher *cipher; |
| size_t i, enclen = 0; |
| struct sshkey *kswap = NULL, tmp; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k)); |
| #endif |
| if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if (cipher_keylen(cipher) + cipher_ivlen(cipher) > |
| ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) { |
| r = SSH_ERR_INTERNAL_ERROR; |
| goto out; |
| } |
| |
| /* Prepare a random pre-key, and from it an ephemeral key */ |
| if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN); |
| if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH, |
| prekey, SSHKEY_SHIELD_PREKEY_LEN, |
| keyiv, SSH_DIGEST_MAX_LENGTH)) != 0) |
| goto out; |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: key+iv\n", __func__); |
| sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH), |
| stderr); |
| #endif |
| if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher), |
| keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0) |
| goto out; |
| |
| /* Serialise and encrypt the private key using the ephemeral key */ |
| if ((prvbuf = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0) |
| goto out; |
| if ((r = sshkey_private_serialize_opt(k, prvbuf, |
| SSHKEY_SERIALIZE_FULL)) != 0) |
| goto out; |
| /* pad to cipher blocksize */ |
| i = 0; |
| while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) { |
| if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0) |
| goto out; |
| } |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: serialised\n", __func__); |
| sshbuf_dump(prvbuf, stderr); |
| #endif |
| /* encrypt */ |
| enclen = sshbuf_len(prvbuf); |
| if ((enc = malloc(enclen)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = cipher_crypt(cctx, 0, enc, |
| sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0) |
| goto out; |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: encrypted\n", __func__); |
| sshbuf_dump_data(enc, enclen, stderr); |
| #endif |
| |
| /* Make a scrubbed, public-only copy of our private key argument */ |
| if ((r = sshkey_from_private(k, &kswap)) != 0) |
| goto out; |
| |
| /* Swap the private key out (it will be destroyed below) */ |
| tmp = *kswap; |
| *kswap = *k; |
| *k = tmp; |
| |
| /* Insert the shielded key into our argument */ |
| k->shielded_private = enc; |
| k->shielded_len = enclen; |
| k->shield_prekey = prekey; |
| k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN; |
| enc = prekey = NULL; /* transferred */ |
| enclen = 0; |
| |
| /* success */ |
| r = 0; |
| |
| out: |
| /* XXX behaviour on error - invalidate original private key? */ |
| cipher_free(cctx); |
| explicit_bzero(keyiv, sizeof(keyiv)); |
| explicit_bzero(&tmp, sizeof(tmp)); |
| freezero(enc, enclen); |
| freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN); |
| sshkey_free(kswap); |
| sshbuf_free(prvbuf); |
| return r; |
| } |
| |
| int |
| sshkey_unshield_private(struct sshkey *k) |
| { |
| struct sshbuf *prvbuf = NULL; |
| u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH]; |
| struct sshcipher_ctx *cctx = NULL; |
| const struct sshcipher *cipher; |
| size_t i; |
| struct sshkey *kswap = NULL, tmp; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k)); |
| #endif |
| if (!sshkey_is_shielded(k)) |
| return 0; /* nothing to do */ |
| |
| if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if (cipher_keylen(cipher) + cipher_ivlen(cipher) > |
| ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) { |
| r = SSH_ERR_INTERNAL_ERROR; |
| goto out; |
| } |
| /* check size of shielded key blob */ |
| if (k->shielded_len < cipher_blocksize(cipher) || |
| (k->shielded_len % cipher_blocksize(cipher)) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* Calculate the ephemeral key from the prekey */ |
| if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH, |
| k->shield_prekey, k->shield_prekey_len, |
| keyiv, SSH_DIGEST_MAX_LENGTH)) != 0) |
| goto out; |
| if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher), |
| keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0) |
| goto out; |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: key+iv\n", __func__); |
| sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH), |
| stderr); |
| #endif |
| |
| /* Decrypt and parse the shielded private key using the ephemeral key */ |
| if ((prvbuf = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0) |
| goto out; |
| /* decrypt */ |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: encrypted\n", __func__); |
| sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr); |
| #endif |
| if ((r = cipher_crypt(cctx, 0, cp, |
| k->shielded_private, k->shielded_len, 0, 0)) != 0) |
| goto out; |
| #ifdef DEBUG_PK |
| fprintf(stderr, "%s: serialised\n", __func__); |
| sshbuf_dump(prvbuf, stderr); |
| #endif |
| /* Parse private key */ |
| if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0) |
| goto out; |
| /* Check deterministic padding */ |
| i = 0; |
| while (sshbuf_len(prvbuf)) { |
| if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0) |
| goto out; |
| if (pad != (++i & 0xff)) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| |
| /* Swap the parsed key back into place */ |
| tmp = *kswap; |
| *kswap = *k; |
| *k = tmp; |
| |
| /* success */ |
| r = 0; |
| |
| out: |
| cipher_free(cctx); |
| explicit_bzero(keyiv, sizeof(keyiv)); |
| explicit_bzero(&tmp, sizeof(tmp)); |
| sshkey_free(kswap); |
| sshbuf_free(prvbuf); |
| return r; |
| } |
| |
| static int |
| cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf) |
| { |
| struct sshbuf *principals = NULL, *crit = NULL; |
| struct sshbuf *exts = NULL, *ca = NULL; |
| u_char *sig = NULL; |
| size_t signed_len = 0, slen = 0, kidlen = 0; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| /* Copy the entire key blob for verification and later serialisation */ |
| if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0) |
| return ret; |
| |
| /* Parse body of certificate up to signature */ |
| if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 || |
| (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 || |
| (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 || |
| (ret = sshbuf_froms(b, &principals)) != 0 || |
| (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 || |
| (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 || |
| (ret = sshbuf_froms(b, &crit)) != 0 || |
| (ret = sshbuf_froms(b, &exts)) != 0 || |
| (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || |
| (ret = sshbuf_froms(b, &ca)) != 0) { |
| /* XXX debug print error for ret */ |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* Signature is left in the buffer so we can calculate this length */ |
| signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b); |
| |
| if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| if (key->cert->type != SSH2_CERT_TYPE_USER && |
| key->cert->type != SSH2_CERT_TYPE_HOST) { |
| ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE; |
| goto out; |
| } |
| |
| /* Parse principals section */ |
| while (sshbuf_len(principals) > 0) { |
| char *principal = NULL; |
| char **oprincipals = NULL; |
| |
| if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if ((ret = sshbuf_get_cstring(principals, &principal, |
| NULL)) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| oprincipals = key->cert->principals; |
| key->cert->principals = recallocarray(key->cert->principals, |
| key->cert->nprincipals, key->cert->nprincipals + 1, |
| sizeof(*key->cert->principals)); |
| if (key->cert->principals == NULL) { |
| free(principal); |
| key->cert->principals = oprincipals; |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| key->cert->principals[key->cert->nprincipals++] = principal; |
| } |
| |
| /* |
| * Stash a copies of the critical options and extensions sections |
| * for later use. |
| */ |
| if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 || |
| (exts != NULL && |
| (ret = sshbuf_putb(key->cert->extensions, exts)) != 0)) |
| goto out; |
| |
| /* |
| * Validate critical options and extensions sections format. |
| */ |
| while (sshbuf_len(crit) != 0) { |
| if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 || |
| (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) { |
| sshbuf_reset(key->cert->critical); |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| while (exts != NULL && sshbuf_len(exts) != 0) { |
| if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 || |
| (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) { |
| sshbuf_reset(key->cert->extensions); |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| |
| /* Parse CA key and check signature */ |
| if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) { |
| ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| goto out; |
| } |
| if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) { |
| ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| goto out; |
| } |
| if ((ret = sshkey_verify(key->cert->signature_key, sig, slen, |
| sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0)) != 0) |
| goto out; |
| if ((ret = get_sigtype(sig, slen, &key->cert->signature_type)) != 0) |
| goto out; |
| |
| /* Success */ |
| ret = 0; |
| out: |
| sshbuf_free(ca); |
| sshbuf_free(crit); |
| sshbuf_free(exts); |
| sshbuf_free(principals); |
| free(sig); |
| return ret; |
| } |
| |
| #ifdef WITH_OPENSSL |
| static int |
| check_rsa_length(const RSA *rsa) |
| { |
| const BIGNUM *rsa_n; |
| |
| RSA_get0_key(rsa, &rsa_n, NULL, NULL); |
| if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE) |
| return SSH_ERR_KEY_LENGTH; |
| return 0; |
| } |
| #endif |
| |
| static int |
| sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp, |
| int allow_cert) |
| { |
| int type, ret = SSH_ERR_INTERNAL_ERROR; |
| char *ktype = NULL, *curve = NULL, *xmss_name = NULL; |
| struct sshkey *key = NULL; |
| size_t len; |
| u_char *pk = NULL; |
| struct sshbuf *copy; |
| #if defined(WITH_OPENSSL) |
| BIGNUM *rsa_n = NULL, *rsa_e = NULL; |
| BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL; |
| # if defined(OPENSSL_HAS_ECC) |
| EC_POINT *q = NULL; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| |
| #ifdef DEBUG_PK /* XXX */ |
| sshbuf_dump(b, stderr); |
| #endif |
| if (keyp != NULL) |
| *keyp = NULL; |
| if ((copy = sshbuf_fromb(b)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_cstring(b, &ktype, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| type = sshkey_type_from_name(ktype); |
| if (!allow_cert && sshkey_type_is_cert(type)) { |
| ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| goto out; |
| } |
| switch (type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| case KEY_RSA: |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_bignum2(b, &rsa_e) != 0 || |
| sshbuf_get_bignum2(b, &rsa_n) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| rsa_n = rsa_e = NULL; /* transferred */ |
| if ((ret = check_rsa_length(key->rsa)) != 0) |
| goto out; |
| #ifdef DEBUG_PK |
| RSA_print_fp(stderr, key->rsa, 8); |
| #endif |
| break; |
| case KEY_DSA_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| case KEY_DSA: |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_bignum2(b, &dsa_p) != 0 || |
| sshbuf_get_bignum2(b, &dsa_q) != 0 || |
| sshbuf_get_bignum2(b, &dsa_g) != 0 || |
| sshbuf_get_bignum2(b, &dsa_pub_key) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| dsa_p = dsa_q = dsa_g = NULL; /* transferred */ |
| if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| dsa_pub_key = NULL; /* transferred */ |
| #ifdef DEBUG_PK |
| DSA_print_fp(stderr, key->dsa, 8); |
| #endif |
| break; |
| case KEY_ECDSA_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype); |
| if (sshbuf_get_cstring(b, &curve, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { |
| ret = SSH_ERR_EC_CURVE_MISMATCH; |
| goto out; |
| } |
| EC_KEY_free(key->ecdsa); |
| if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) |
| == NULL) { |
| ret = SSH_ERR_EC_CURVE_INVALID; |
| goto out; |
| } |
| if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), |
| q) != 0) { |
| ret = SSH_ERR_KEY_INVALID_EC_VALUE; |
| goto out; |
| } |
| if (EC_KEY_set_public_key(key->ecdsa, q) != 1) { |
| /* XXX assume it is a allocation error */ |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| #ifdef DEBUG_PK |
| sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q); |
| #endif |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| case KEY_ED25519: |
| if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) |
| goto out; |
| if (len != ED25519_PK_SZ) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| key->ed25519_pk = pk; |
| pk = NULL; |
| break; |
| #ifdef WITH_XMSS |
| case KEY_XMSS_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| case KEY_XMSS: |
| if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0) |
| goto out; |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((ret = sshkey_xmss_init(key, xmss_name)) != 0) |
| goto out; |
| if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) |
| goto out; |
| if (len == 0 || len != sshkey_xmss_pklen(key)) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| key->xmss_pk = pk; |
| pk = NULL; |
| if (type != KEY_XMSS_CERT && |
| (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0) |
| goto out; |
| break; |
| #endif /* WITH_XMSS */ |
| case KEY_UNSPEC: |
| default: |
| ret = SSH_ERR_KEY_TYPE_UNKNOWN; |
| goto out; |
| } |
| |
| /* Parse certificate potion */ |
| if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0) |
| goto out; |
| |
| if (key != NULL && sshbuf_len(b) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| ret = 0; |
| if (keyp != NULL) { |
| *keyp = key; |
| key = NULL; |
| } |
| out: |
| sshbuf_free(copy); |
| sshkey_free(key); |
| free(xmss_name); |
| free(ktype); |
| free(curve); |
| free(pk); |
| #if defined(WITH_OPENSSL) |
| BN_clear_free(rsa_n); |
| BN_clear_free(rsa_e); |
| BN_clear_free(dsa_p); |
| BN_clear_free(dsa_q); |
| BN_clear_free(dsa_g); |
| BN_clear_free(dsa_pub_key); |
| # if defined(OPENSSL_HAS_ECC) |
| EC_POINT_free(q); |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| return ret; |
| } |
| |
| int |
| sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp) |
| { |
| struct sshbuf *b; |
| int r; |
| |
| if ((b = sshbuf_from(blob, blen)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| r = sshkey_from_blob_internal(b, keyp, 1); |
| sshbuf_free(b); |
| return r; |
| } |
| |
| int |
| sshkey_fromb(struct sshbuf *b, struct sshkey **keyp) |
| { |
| return sshkey_from_blob_internal(b, keyp, 1); |
| } |
| |
| int |
| sshkey_froms(struct sshbuf *buf, struct sshkey **keyp) |
| { |
| struct sshbuf *b; |
| int r; |
| |
| if ((r = sshbuf_froms(buf, &b)) != 0) |
| return r; |
| r = sshkey_from_blob_internal(b, keyp, 1); |
| sshbuf_free(b); |
| return r; |
| } |
| |
| static int |
| get_sigtype(const u_char *sig, size_t siglen, char **sigtypep) |
| { |
| int r; |
| struct sshbuf *b = NULL; |
| char *sigtype = NULL; |
| |
| if (sigtypep != NULL) |
| *sigtypep = NULL; |
| if ((b = sshbuf_from(sig, siglen)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0) |
| goto out; |
| /* success */ |
| if (sigtypep != NULL) { |
| *sigtypep = sigtype; |
| sigtype = NULL; |
| } |
| r = 0; |
| out: |
| free(sigtype); |
| sshbuf_free(b); |
| return r; |
| } |
| |
| /* |
| * |
| * Checks whether a certificate's signature type is allowed. |
| * Returns 0 (success) if the certificate signature type appears in the |
| * "allowed" pattern-list, or the key is not a certificate to begin with. |
| * Otherwise returns a ssherr.h code. |
| */ |
| int |
| sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed) |
| { |
| if (key == NULL || allowed == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if (!sshkey_type_is_cert(key->type)) |
| return 0; |
| if (key->cert == NULL || key->cert->signature_type == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1) |
| return SSH_ERR_SIGN_ALG_UNSUPPORTED; |
| return 0; |
| } |
| |
| /* |
| * Returns the expected signature algorithm for a given public key algorithm. |
| */ |
| const char * |
| sshkey_sigalg_by_name(const char *name) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (strcmp(kt->name, name) != 0) |
| continue; |
| if (kt->sigalg != NULL) |
| return kt->sigalg; |
| if (!kt->cert) |
| return kt->name; |
| return sshkey_ssh_name_from_type_nid( |
| sshkey_type_plain(kt->type), kt->nid); |
| } |
| return NULL; |
| } |
| |
| /* |
| * Verifies that the signature algorithm appearing inside the signature blob |
| * matches that which was requested. |
| */ |
| int |
| sshkey_check_sigtype(const u_char *sig, size_t siglen, |
| const char *requested_alg) |
| { |
| const char *expected_alg; |
| char *sigtype = NULL; |
| int r; |
| |
| if (requested_alg == NULL) |
| return 0; |
| if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((r = get_sigtype(sig, siglen, &sigtype)) != 0) |
| return r; |
| r = strcmp(expected_alg, sigtype) == 0; |
| free(sigtype); |
| return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED; |
| } |
| |
| int |
| sshkey_sign(struct sshkey *key, |
| u_char **sigp, size_t *lenp, |
| const u_char *data, size_t datalen, const char *alg, u_int compat) |
| { |
| int was_shielded = sshkey_is_shielded(key); |
| int r2, r = SSH_ERR_INTERNAL_ERROR; |
| |
| if (sigp != NULL) |
| *sigp = NULL; |
| if (lenp != NULL) |
| *lenp = 0; |
| if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((r = sshkey_unshield_private(key)) != 0) |
| return r; |
| switch (key->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| case KEY_DSA: |
| r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat); |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA_CERT: |
| case KEY_ECDSA: |
| r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat); |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA_CERT: |
| case KEY_RSA: |
| r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg); |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat); |
| break; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat); |
| break; |
| #endif /* WITH_XMSS */ |
| default: |
| r = SSH_ERR_KEY_TYPE_UNKNOWN; |
| break; |
| } |
| if (was_shielded && (r2 = sshkey_shield_private(key)) != 0) |
| return r2; |
| return r; |
| } |
| |
| /* |
| * ssh_key_verify returns 0 for a correct signature and < 0 on error. |
| * If "alg" specified, then the signature must use that algorithm. |
| */ |
| int |
| sshkey_verify(const struct sshkey *key, |
| const u_char *sig, size_t siglen, |
| const u_char *data, size_t dlen, const char *alg, u_int compat) |
| { |
| if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE) |
| return SSH_ERR_INVALID_ARGUMENT; |
| switch (key->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| case KEY_DSA: |
| return ssh_dss_verify(key, sig, siglen, data, dlen, compat); |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA_CERT: |
| case KEY_ECDSA: |
| return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat); |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA_CERT: |
| case KEY_RSA: |
| return ssh_rsa_verify(key, sig, siglen, data, dlen, alg); |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat); |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| case KEY_XMSS_CERT: |
| return ssh_xmss_verify(key, sig, siglen, data, dlen, compat); |
| #endif /* WITH_XMSS */ |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| } |
| |
| /* Convert a plain key to their _CERT equivalent */ |
| int |
| sshkey_to_certified(struct sshkey *k) |
| { |
| int newtype; |
| |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| newtype = KEY_RSA_CERT; |
| break; |
| case KEY_DSA: |
| newtype = KEY_DSA_CERT; |
| break; |
| case KEY_ECDSA: |
| newtype = KEY_ECDSA_CERT; |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| newtype = KEY_ED25519_CERT; |
| break; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| newtype = KEY_XMSS_CERT; |
| break; |
| #endif /* WITH_XMSS */ |
| 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_custom(struct sshkey *k, struct sshkey *ca, const char *alg, |
| sshkey_certify_signer *signer, void *signer_ctx) |
| { |
| struct sshbuf *principals = NULL; |
| u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32]; |
| size_t i, ca_len, sig_len; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| struct sshbuf *cert = NULL; |
| char *sigtype = NULL; |
| #ifdef WITH_OPENSSL |
| const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; |
| #endif /* WITH_OPENSSL */ |
| |
| 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 no alg specified as argument but a signature_type was set, |
| * then prefer that. If both were specified, then they must match. |
| */ |
| if (alg == NULL) |
| alg = k->cert->signature_type; |
| else if (k->cert->signature_type != NULL && |
| strcmp(alg, k->cert->signature_type) != 0) |
| return SSH_ERR_INVALID_ARGUMENT; |
| |
| /* |
| * If no signing algorithm or signature_type was specified and we're |
| * using a RSA key, then default to a good signature algorithm. |
| */ |
| if (alg == NULL && ca->type == KEY_RSA) |
| alg = "rsa-sha2-512"; |
| |
| if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0) |
| return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| |
| cert = k->cert->certblob; /* for readability */ |
| sshbuf_reset(cert); |
| if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0) |
| goto out; |
| |
| /* -v01 certs put nonce first */ |
| arc4random_buf(&nonce, sizeof(nonce)); |
| if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0) |
| goto out; |
| |
| /* XXX this substantially duplicates to_blob(); refactor */ |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g); |
| DSA_get0_key(k->dsa, &dsa_pub_key, NULL); |
| if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, 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: |
| RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL); |
| if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, 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; |
| #ifdef WITH_XMSS |
| case KEY_XMSS_CERT: |
| if (k->xmss_name == NULL) { |
| ret = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) || |
| (ret = sshbuf_put_string(cert, |
| k->xmss_pk, sshkey_xmss_pklen(k))) != 0) |
| goto out; |
| break; |
| #endif /* WITH_XMSS */ |
| default: |
| ret = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| |
| if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 || |
| (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 || |
| (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0) |
| goto out; |
| |
| if ((principals = sshbuf_new()) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| for (i = 0; i < k->cert->nprincipals; i++) { |
| if ((ret = sshbuf_put_cstring(principals, |
| k->cert->principals[i])) != 0) |
| goto out; |
| } |
| if ((ret = sshbuf_put_stringb(cert, principals)) != 0 || |
| (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 || |
| (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 || |
| (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 || |
| (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 || |
| (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */ |
| (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0) |
| goto out; |
| |
| /* Sign the whole mess */ |
| if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert), |
| sshbuf_len(cert), alg, 0, signer_ctx)) != 0) |
| goto out; |
| /* Check and update signature_type against what was actually used */ |
| if ((ret = get_sigtype(sig_blob, sig_len, &sigtype)) != 0) |
| goto out; |
| if (alg != NULL && strcmp(alg, sigtype) != 0) { |
| ret = SSH_ERR_SIGN_ALG_UNSUPPORTED; |
| goto out; |
| } |
| if (k->cert->signature_type == NULL) { |
| k->cert->signature_type = sigtype; |
| sigtype = NULL; |
| } |
| /* Append signature and we are done */ |
| if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0) |
| goto out; |
| ret = 0; |
| out: |
| if (ret != 0) |
| sshbuf_reset(cert); |
| free(sig_blob); |
| free(ca_blob); |
| free(sigtype); |
| sshbuf_free(principals); |
| return ret; |
| } |
| |
| static int |
| default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp, |
| const u_char *data, size_t datalen, |
| const char *alg, u_int compat, void *ctx) |
| { |
| if (ctx != NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| return sshkey_sign(key, sigp, lenp, data, datalen, alg, compat); |
| } |
| |
| int |
| sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg) |
| { |
| return sshkey_certify_custom(k, ca, alg, default_key_sign, NULL); |
| } |
| |
| int |
| sshkey_cert_check_authority(const struct sshkey *k, |
| int want_host, int require_principal, |
| const char *name, const char **reason) |
| { |
| u_int i, principal_matches; |
| time_t now = time(NULL); |
| |
| if (reason != NULL) |
| *reason = NULL; |
| |
| if (want_host) { |
| if (k->cert->type != SSH2_CERT_TYPE_HOST) { |
| *reason = "Certificate invalid: not a host certificate"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } else { |
| if (k->cert->type != SSH2_CERT_TYPE_USER) { |
| *reason = "Certificate invalid: not a user certificate"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } |
| if (now < 0) { |
| /* yikes - system clock before epoch! */ |
| *reason = "Certificate invalid: not yet valid"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| if ((u_int64_t)now < k->cert->valid_after) { |
| *reason = "Certificate invalid: not yet valid"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| if ((u_int64_t)now >= k->cert->valid_before) { |
| *reason = "Certificate invalid: expired"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| if (k->cert->nprincipals == 0) { |
| if (require_principal) { |
| *reason = "Certificate lacks principal list"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } else if (name != NULL) { |
| principal_matches = 0; |
| for (i = 0; i < k->cert->nprincipals; i++) { |
| if (strcmp(name, k->cert->principals[i]) == 0) { |
| principal_matches = 1; |
| break; |
| } |
| } |
| if (!principal_matches) { |
| *reason = "Certificate invalid: name is not a listed " |
| "principal"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } |
| return 0; |
| } |
| |
| size_t |
| sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l) |
| { |
| char from[32], to[32], ret[64]; |
| time_t tt; |
| struct tm *tm; |
| |
| *from = *to = '\0'; |
| if (cert->valid_after == 0 && |
| cert->valid_before == 0xffffffffffffffffULL) |
| return strlcpy(s, "forever", l); |
| |
| if (cert->valid_after != 0) { |
| /* XXX revisit INT_MAX in 2038 :) */ |
| tt = cert->valid_after > INT_MAX ? |
| INT_MAX : cert->valid_after; |
| tm = localtime(&tt); |
| strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); |
| } |
| if (cert->valid_before != 0xffffffffffffffffULL) { |
| /* XXX revisit INT_MAX in 2038 :) */ |
| tt = cert->valid_before > INT_MAX ? |
| INT_MAX : cert->valid_before; |
| tm = localtime(&tt); |
| strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); |
| } |
| |
| if (cert->valid_after == 0) |
| snprintf(ret, sizeof(ret), "before %s", to); |
| else if (cert->valid_before == 0xffffffffffffffffULL) |
| snprintf(ret, sizeof(ret), "after %s", from); |
| else |
| snprintf(ret, sizeof(ret), "from %s to %s", from, to); |
| |
| return strlcpy(s, ret, l); |
| } |
| |
| int |
| sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf, |
| enum sshkey_serialize_rep opts) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| int was_shielded = sshkey_is_shielded(key); |
| struct sshbuf *b = NULL; |
| #ifdef WITH_OPENSSL |
| const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q; |
| const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key; |
| #endif /* WITH_OPENSSL */ |
| |
| if ((r = sshkey_unshield_private(key)) != 0) |
| return r; |
| if ((b = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0) |
| goto out; |
| switch (key->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d); |
| RSA_get0_factors(key->rsa, &rsa_p, &rsa_q); |
| RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp); |
| if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_e)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_d)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_p)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_q)) != 0) |
| goto out; |
| break; |
| case KEY_RSA_CERT: |
| if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| RSA_get0_key(key->rsa, NULL, NULL, &rsa_d); |
| RSA_get0_factors(key->rsa, &rsa_p, &rsa_q); |
| RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp); |
| if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_d)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_p)) != 0 || |
| (r = sshbuf_put_bignum2(b, rsa_q)) != 0) |
| goto out; |
| break; |
| case KEY_DSA: |
| DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g); |
| DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key); |
| if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 || |
| (r = sshbuf_put_bignum2(b, dsa_q)) != 0 || |
| (r = sshbuf_put_bignum2(b, dsa_g)) != 0 || |
| (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 || |
| (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0) |
| goto out; |
| break; |
| case KEY_DSA_CERT: |
| if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| DSA_get0_key(key->dsa, NULL, &dsa_priv_key); |
| if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| (r = sshbuf_put_bignum2(b, 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; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| if (key->xmss_name == NULL) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 || |
| (r = sshbuf_put_string(b, key->xmss_pk, |
| sshkey_xmss_pklen(key))) != 0 || |
| (r = sshbuf_put_string(b, key->xmss_sk, |
| sshkey_xmss_sklen(key))) != 0 || |
| (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0) |
| goto out; |
| break; |
| case KEY_XMSS_CERT: |
| if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 || |
| key->xmss_name == NULL) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 || |
| (r = sshbuf_put_string(b, key->xmss_pk, |
| sshkey_xmss_pklen(key))) != 0 || |
| (r = sshbuf_put_string(b, key->xmss_sk, |
| sshkey_xmss_sklen(key))) != 0 || |
| (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0) |
| goto out; |
| break; |
| #endif /* WITH_XMSS */ |
| default: |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| /* |
| * success (but we still need to append the output to buf after |
| * possibly re-shielding the private key) |
| */ |
| r = 0; |
| out: |
| if (was_shielded) |
| r = sshkey_shield_private(key); |
| if (r == 0) |
| r = sshbuf_putb(buf, b); |
| sshbuf_free(b); |
| |
| return r; |
| } |
| |
| int |
| sshkey_private_serialize(struct sshkey *key, struct sshbuf *b) |
| { |
| return sshkey_private_serialize_opt(key, b, |
| SSHKEY_SERIALIZE_DEFAULT); |
| } |
| |
| int |
| sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp) |
| { |
| char *tname = NULL, *curve = NULL, *xmss_name = NULL; |
| struct sshkey *k = NULL; |
| size_t pklen = 0, sklen = 0; |
| int type, r = SSH_ERR_INTERNAL_ERROR; |
| u_char *ed25519_pk = NULL, *ed25519_sk = NULL; |
| u_char *xmss_pk = NULL, *xmss_sk = NULL; |
| #ifdef WITH_OPENSSL |
| BIGNUM *exponent = NULL; |
| BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; |
| BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL; |
| BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; |
| BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = 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(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0) |
| goto out; |
| if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| dsa_p = dsa_q = dsa_g = NULL; /* transferred */ |
| if (!DSA_set0_key(k->dsa, dsa_pub_key, dsa_priv_key)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| dsa_pub_key = dsa_priv_key = NULL; /* transferred */ |
| break; |
| case KEY_DSA_CERT: |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0) |
| goto out; |
| if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| dsa_priv_key = NULL; /* transferred */ |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if ((k = sshkey_new(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) { |
| 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 ((r = sshkey_froms(buf, &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(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0) |
| goto out; |
| if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, rsa_d)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| rsa_n = rsa_e = rsa_d = NULL; /* transferred */ |
| if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| rsa_p = rsa_q = NULL; /* transferred */ |
| if ((r = check_rsa_length(k->rsa)) != 0) |
| goto out; |
| if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0) |
| goto out; |
| break; |
| case KEY_RSA_CERT: |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 || |
| (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0) |
| goto out; |
| if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| rsa_d = NULL; /* transferred */ |
| if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| rsa_p = rsa_q = NULL; /* transferred */ |
| if ((r = check_rsa_length(k->rsa)) != 0) |
| goto out; |
| if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0) |
| goto out; |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| if ((k = sshkey_new(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || |
| (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) |
| goto out; |
| if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| k->ed25519_pk = ed25519_pk; |
| k->ed25519_sk = ed25519_sk; |
| ed25519_pk = ed25519_sk = NULL; |
| break; |
| case KEY_ED25519_CERT: |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = 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; |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| if ((k = sshkey_new(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 || |
| (r = sshkey_xmss_init(k, xmss_name)) != 0 || |
| (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 || |
| (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0) |
| goto out; |
| if (pklen != sshkey_xmss_pklen(k) || |
| sklen != sshkey_xmss_sklen(k)) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| k->xmss_pk = xmss_pk; |
| k->xmss_sk = xmss_sk; |
| xmss_pk = xmss_sk = NULL; |
| /* optional internal state */ |
| if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0) |
| goto out; |
| break; |
| case KEY_XMSS_CERT: |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 || |
| (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 || |
| (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0) |
| goto out; |
| if (strcmp(xmss_name, k->xmss_name)) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (pklen != sshkey_xmss_pklen(k) || |
| sklen != sshkey_xmss_sklen(k)) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| k->xmss_pk = xmss_pk; |
| k->xmss_sk = xmss_sk; |
| xmss_pk = xmss_sk = NULL; |
| /* optional internal state */ |
| if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0) |
| goto out; |
| break; |
| #endif /* WITH_XMSS */ |
| default: |
| r = SSH_ERR_KEY_TYPE_UNKNOWN; |
| goto out; |
| } |
| #ifdef WITH_OPENSSL |
| /* enable blinding */ |
| switch (k->type) { |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| 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 |
| BN_clear_free(exponent); |
| BN_clear_free(dsa_p); |
| BN_clear_free(dsa_q); |
| BN_clear_free(dsa_g); |
| BN_clear_free(dsa_pub_key); |
| BN_clear_free(dsa_priv_key); |
| BN_clear_free(rsa_n); |
| BN_clear_free(rsa_e); |
| BN_clear_free(rsa_d); |
| BN_clear_free(rsa_p); |
| BN_clear_free(rsa_q); |
| BN_clear_free(rsa_iqmp); |
| #endif /* WITH_OPENSSL */ |
| sshkey_free(k); |
| freezero(ed25519_pk, pklen); |
| freezero(ed25519_sk, sklen); |
| free(xmss_name); |
| freezero(xmss_pk, pklen); |
| freezero(xmss_sk, sklen); |
| return r; |
| } |
| |
| #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) |
| int |
| sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public) |
| { |
| BN_CTX *bnctx; |
| EC_POINT *nq = NULL; |
| BIGNUM *order, *x, *y, *tmp; |
| int ret = SSH_ERR_KEY_INVALID_EC_VALUE; |
| |
| /* |
| * NB. This assumes OpenSSL has already verified that the public |
| * point lies on the curve. This is done by EC_POINT_oct2point() |
| * implicitly calling EC_POINT_is_on_curve(). If this code is ever |
| * reachable with public points not unmarshalled using |
| * EC_POINT_oct2point then the caller will need to explicitly check. |
| */ |
| |
| if ((bnctx = BN_CTX_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| BN_CTX_start(bnctx); |
| |
| /* |
| * We shouldn't ever hit this case because bignum_get_ecpoint() |
| * refuses to load GF2m points. |
| */ |
| if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| NID_X9_62_prime_field) |
| goto out; |
| |
| /* Q != infinity */ |
| if (EC_POINT_is_at_infinity(group, public)) |
| goto out; |
| |
| if ((x = BN_CTX_get(bnctx)) == NULL || |
| (y = BN_CTX_get(bnctx)) == NULL || |
| (order = BN_CTX_get(bnctx)) == NULL || |
| (tmp = BN_CTX_get(bnctx)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */ |
| if (EC_GROUP_get_order(group, order, bnctx) != 1 || |
| EC_POINT_get_affine_coordinates_GFp(group, public, |
| x, y, bnctx) != 1) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (BN_num_bits(x) <= BN_num_bits(order) / 2 || |
| BN_num_bits(y) <= BN_num_bits(order) / 2) |
| goto out; |
| |
| /* nQ == infinity (n == order of subgroup) */ |
| if ((nq = EC_POINT_new(group)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (EC_POINT_is_at_infinity(group, nq) != 1) |
| goto out; |
| |
| /* x < order - 1, y < order - 1 */ |
| if (!BN_sub(tmp, order, BN_value_one())) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0) |
| goto out; |
| ret = 0; |
| out: |
| BN_CTX_free(bnctx); |
| 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(struct sshkey *prv, struct sshbuf *blob, |
| const char *passphrase, const char *comment, const char *ciphername, |
| int rounds) |
| { |
| u_char *cp, *key = NULL, *pubkeyblob = NULL; |
| u_char salt[SALT_LEN]; |
| char *b64 = NULL; |
| size_t i, pubkeylen, keylen, ivlen, blocksize, authlen; |
| u_int check; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| struct sshcipher_ctx *ciphercontext = NULL; |
| const struct sshcipher *cipher; |
| const char *kdfname = KDFNAME; |
| struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL; |
| |
| if (rounds <= 0) |
| rounds = DEFAULT_ROUNDS; |
| if (passphrase == NULL || !strlen(passphrase)) { |
| ciphername = "none"; |
| kdfname = "none"; |
| } else if (ciphername == NULL) |
| ciphername = DEFAULT_CIPHERNAME; |
| if ((cipher = cipher_by_name(ciphername)) == NULL) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| |
| if ((kdf = sshbuf_new()) == NULL || |
| (encoded = sshbuf_new()) == NULL || |
| (encrypted = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| blocksize = cipher_blocksize(cipher); |
| keylen = cipher_keylen(cipher); |
| ivlen = cipher_ivlen(cipher); |
| authlen = cipher_authlen(cipher); |
| if ((key = calloc(1, keylen + ivlen)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (strcmp(kdfname, "bcrypt") == 0) { |
| arc4random_buf(salt, SALT_LEN); |
| if (bcrypt_pbkdf(passphrase, strlen(passphrase), |
| salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 || |
| (r = sshbuf_put_u32(kdf, rounds)) != 0) |
| goto out; |
| } else if (strcmp(kdfname, "none") != 0) { |
| /* Unsupported KDF type */ |
| r = SSH_ERR_KEY_UNKNOWN_CIPHER; |
| goto out; |
| } |
| if ((r = cipher_init(&ciphercontext, cipher, key, keylen, |
| key + keylen, ivlen, 1)) != 0) |
| goto out; |
| |
| if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 || |
| (r = sshbuf_put_cstring(encoded, ciphername)) != 0 || |
| (r = sshbuf_put_cstring(encoded, kdfname)) != 0 || |
| (r = sshbuf_put_stringb(encoded, kdf)) != 0 || |
| (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */ |
| (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 || |
| (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0) |
| goto out; |
| |
| /* set up the buffer that will be encrypted */ |
| |
| /* Random check bytes */ |
| check = arc4random(); |
| if ((r = sshbuf_put_u32(encrypted, check)) != 0 || |
| (r = sshbuf_put_u32(encrypted, check)) != 0) |
| goto out; |
| |
| /* append private key and comment*/ |
| if ((r = sshkey_private_serialize_opt(prv, encrypted, |
| SSHKEY_SERIALIZE_FULL)) != 0 || |
| (r = sshbuf_put_cstring(encrypted, comment)) != 0) |
| goto out; |
| |
| /* padding */ |
| i = 0; |
| while (sshbuf_len(encrypted) % blocksize) { |
| if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0) |
| goto out; |
| } |
| |
| /* length in destination buffer */ |
| if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0) |
| goto out; |
| |
| /* encrypt */ |
| if ((r = sshbuf_reserve(encoded, |
| sshbuf_len(encrypted) + authlen, &cp)) != 0) |
| goto out; |
| if ((r = cipher_crypt(ciphercontext, 0, cp, |
| sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0) |
| goto out; |
| |
| sshbuf_reset(blob); |
| |
| /* assemble uuencoded key */ |
| if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 || |
| (r = sshbuf_dtob64(encoded, blob, 1)) != 0 || |
| (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0) |
| goto out; |
| |
| /* success */ |
| r = 0; |
| |
| out: |
| sshbuf_free(kdf); |
| sshbuf_free(encoded); |
| sshbuf_free(encrypted); |
| cipher_free(ciphercontext); |
| explicit_bzero(salt, sizeof(salt)); |
| if (key != NULL) { |
| explicit_bzero(key, keylen + ivlen); |
| free(key); |
| } |
| if (pubkeyblob != NULL) { |
| explicit_bzero(pubkeyblob, pubkeylen); |
| free(pubkeyblob); |
| } |
| if (b64 != NULL) { |
| explicit_bzero(b64, strlen(b64)); |
| free(b64); |
| } |
| return r; |
| } |
| |
| static int |
| sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase, |
| struct sshkey **keyp, char **commentp) |
| { |
| char *comment = NULL, *ciphername = NULL, *kdfname = NULL; |
| const struct sshcipher *cipher = NULL; |
| const u_char *cp; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| size_t encoded_len; |
| size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0; |
| struct sshbuf *encoded = NULL, *decoded = NULL; |
| struct sshbuf *kdf = NULL, *decrypted = NULL; |
| struct sshcipher_ctx *ciphercontext = NULL; |
| struct sshkey *k = NULL; |
| u_char *key = NULL, *salt = NULL, *dp, pad, last; |
| u_int blocksize, rounds, nkeys, encrypted_len, check1, check2; |
| |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| if ((encoded = sshbuf_new()) == NULL || |
| (decoded = sshbuf_new()) == NULL || |
| (decrypted = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| /* check preamble */ |
| cp = sshbuf_ptr(blob); |
| encoded_len = sshbuf_len(blob); |
| if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) || |
| memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| cp += MARK_BEGIN_LEN; |
| encoded_len -= MARK_BEGIN_LEN; |
| |
| /* Look for end marker, removing whitespace as we go */ |
| while (encoded_len > 0) { |
| if (*cp != '\n' && *cp != '\r') { |
| if ((r = sshbuf_put_u8(encoded, *cp)) != 0) |
| goto out; |
| } |
| last = *cp; |
| encoded_len--; |
| cp++; |
| if (last == '\n') { |
| if (encoded_len >= MARK_END_LEN && |
| memcmp(cp, MARK_END, MARK_END_LEN) == 0) { |
| /* \0 terminate */ |
| if ((r = sshbuf_put_u8(encoded, 0)) != 0) |
| goto out; |
| break; |
| } |
| } |
| } |
| if (encoded_len == 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* decode base64 */ |
| if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0) |
| goto out; |
| |
| /* check magic */ |
| if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) || |
| memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* parse public portion of key */ |
| if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 || |
| (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 || |
| (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 || |
| (r = sshbuf_froms(decoded, &kdf)) != 0 || |
| (r = sshbuf_get_u32(decoded, &nkeys)) != 0 || |
| (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */ |
| (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0) |
| goto out; |
| |
| if ((cipher = cipher_by_name(ciphername)) == NULL) { |
| r = SSH_ERR_KEY_UNKNOWN_CIPHER; |
| goto out; |
| } |
| if ((passphrase == NULL || strlen(passphrase) == 0) && |
| strcmp(ciphername, "none") != 0) { |
| /* passphrase required */ |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) { |
| r = SSH_ERR_KEY_UNKNOWN_CIPHER; |
| goto out; |
| } |
| if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (nkeys != 1) { |
| /* XXX only one key supported */ |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* check size of encrypted key blob */ |
| blocksize = cipher_blocksize(cipher); |
| if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* setup key */ |
| keylen = cipher_keylen(cipher); |
| ivlen = cipher_ivlen(cipher); |
| authlen = cipher_authlen(cipher); |
| if ((key = calloc(1, keylen + ivlen)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (strcmp(kdfname, "bcrypt") == 0) { |
| if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 || |
| (r = sshbuf_get_u32(kdf, &rounds)) != 0) |
| goto out; |
| if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen, |
| key, keylen + ivlen, rounds) < 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| |
| /* check that an appropriate amount of auth data is present */ |
| if (sshbuf_len(decoded) < encrypted_len + authlen) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* decrypt private portion of key */ |
| if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 || |
| (r = cipher_init(&ciphercontext, cipher, key, keylen, |
| key + keylen, ivlen, 0)) != 0) |
| goto out; |
| if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded), |
| encrypted_len, 0, authlen)) != 0) { |
| /* an integrity error here indicates an incorrect passphrase */ |
| if (r == SSH_ERR_MAC_INVALID) |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0) |
| goto out; |
| /* there should be no trailing data */ |
| if (sshbuf_len(decoded) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* check check bytes */ |
| if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 || |
| (r = sshbuf_get_u32(decrypted, &check2)) != 0) |
| goto out; |
| if (check1 != check2) { |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| |
| /* Load the private key and comment */ |
| if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 || |
| (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0) |
| goto out; |
| |
| /* Check deterministic padding */ |
| i = 0; |
| while (sshbuf_len(decrypted)) { |
| if ((r = sshbuf_get_u8(decrypted, &pad)) != 0) |
| goto out; |
| if (pad != (++i & 0xff)) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| |
| /* XXX decode pubkey and check against private */ |
| |
| /* success */ |
| r = 0; |
| if (keyp != NULL) { |
| *keyp = k; |
| k = NULL; |
| } |
| if (commentp != NULL) { |
| *commentp = comment; |
| comment = NULL; |
| } |
| out: |
| pad = 0; |
| cipher_free(ciphercontext); |
| free(ciphername); |
| free(kdfname); |
| free(comment); |
| if (salt != NULL) { |
| explicit_bzero(salt, slen); |
| free(salt); |
| } |
| if (key != NULL) { |
| explicit_bzero(key, keylen + ivlen); |
| free(key); |
| } |
| sshbuf_free(encoded); |
| sshbuf_free(decoded); |
| sshbuf_free(kdf); |
| sshbuf_free(decrypted); |
| sshkey_free(k); |
| return r; |
| } |
| |
| |
| #ifdef WITH_OPENSSL |
| /* convert SSH v2 key to PEM or PKCS#8 format */ |
| static int |
| sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf, |
| int format, const char *_passphrase, const char *comment) |
| { |
| int was_shielded = sshkey_is_shielded(key); |
| int success, r; |
| int blen, len = strlen(_passphrase); |
| u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
| const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; |
| char *bptr; |
| BIO *bio = NULL; |
| struct sshbuf *blob; |
| EVP_PKEY *pkey = NULL; |
| |
| if (len > 0 && len <= 4) |
| return SSH_ERR_PASSPHRASE_TOO_SHORT; |
| if ((blob = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((bio = BIO_new(BIO_s_mem())) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshkey_unshield_private(key)) != 0) |
| goto out; |
| |
| switch (key->type) { |
| case KEY_DSA: |
| if (format == SSHKEY_PRIVATE_PEM) { |
| success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, |
| cipher, passphrase, len, NULL, NULL); |
| } else { |
| success = EVP_PKEY_set1_DSA(pkey, key->dsa); |
| } |
| break; |
| #ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if (format == SSHKEY_PRIVATE_PEM) { |
| success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, |
| cipher, passphrase, len, NULL, NULL); |
| } else { |
| success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa); |
| } |
| break; |
| #endif |
| case KEY_RSA: |
| if (format == SSHKEY_PRIVATE_PEM) { |
| success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, |
| cipher, passphrase, len, NULL, NULL); |
| } else { |
| success = EVP_PKEY_set1_RSA(pkey, key->rsa); |
| } |
| break; |
| default: |
| success = 0; |
| break; |
| } |
| if (success == 0) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (format == SSHKEY_PRIVATE_PKCS8) { |
| if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher, |
| passphrase, len, NULL, NULL)) == 0) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| } |
| if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) { |
| r = SSH_ERR_INTERNAL_ERROR; |
| goto out; |
| } |
| if ((r = sshbuf_put(blob, bptr, blen)) != 0) |
| goto out; |
| r = 0; |
| out: |
| if (was_shielded) |
| r = sshkey_shield_private(key); |
| if (r == 0) |
| r = sshbuf_putb(buf, blob); |
| |
| EVP_PKEY_free(pkey); |
| sshbuf_free(blob); |
| BIO_free(bio); |
| return r; |
| } |
| #endif /* WITH_OPENSSL */ |
| |
| /* Serialise "key" to buffer "blob" */ |
| int |
| sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob, |
| const char *passphrase, const char *comment, |
| int format, const char *openssh_format_cipher, int openssh_format_rounds) |
| { |
| switch (key->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_RSA: |
| break; /* see below */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| #endif /* WITH_XMSS */ |
| return sshkey_private_to_blob2(key, blob, passphrase, |
| comment, openssh_format_cipher, openssh_format_rounds); |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| |
| #ifdef WITH_OPENSSL |
| switch (format) { |
| case SSHKEY_PRIVATE_OPENSSH: |
| return sshkey_private_to_blob2(key, blob, passphrase, |
| comment, openssh_format_cipher, openssh_format_rounds); |
| case SSHKEY_PRIVATE_PEM: |
| case SSHKEY_PRIVATE_PKCS8: |
| return sshkey_private_to_blob_pem_pkcs8(key, blob, |
| format, passphrase, comment); |
| default: |
| return SSH_ERR_INVALID_ARGUMENT; |
| } |
| #endif /* WITH_OPENSSL */ |
| } |
| |
| |
| #ifdef WITH_OPENSSL |
| static int |
| translate_libcrypto_error(unsigned long pem_err) |
| { |
| int pem_reason = ERR_GET_REASON(pem_err); |
| |
| switch (ERR_GET_LIB(pem_err)) { |
| case ERR_LIB_PEM: |
| switch (pem_reason) { |
| case PEM_R_BAD_PASSWORD_READ: |
| case PEM_R_PROBLEMS_GETTING_PASSWORD: |
| case PEM_R_BAD_DECRYPT: |
| return SSH_ERR_KEY_WRONG_PASSPHRASE; |
| default: |
| return SSH_ERR_INVALID_FORMAT; |
| } |
| case ERR_LIB_EVP: |
| switch (pem_reason) { |
| case EVP_R_BAD_DECRYPT: |
| return SSH_ERR_KEY_WRONG_PASSPHRASE; |
| #ifdef EVP_R_BN_DECODE_ERROR |
| case EVP_R_BN_DECODE_ERROR: |
| #endif |
| case EVP_R_DECODE_ERROR: |
| #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR |
| case EVP_R_PRIVATE_KEY_DECODE_ERROR: |
| #endif |
| return SSH_ERR_INVALID_FORMAT; |
| default: |
| return SSH_ERR_LIBCRYPTO_ERROR; |
| } |
| case ERR_LIB_ASN1: |
| return SSH_ERR_INVALID_FORMAT; |
| } |
| return SSH_ERR_LIBCRYPTO_ERROR; |
| } |
| |
| static void |
| clear_libcrypto_errors(void) |
| { |
| while (ERR_get_error() != 0) |
| ; |
| } |
| |
| /* |
| * Translate OpenSSL error codes to determine whether |
| * passphrase is required/incorrect. |
| */ |
| static int |
| convert_libcrypto_error(void) |
| { |
| /* |
| * Some password errors are reported at the beginning |
| * of the error queue. |
| */ |
| if (translate_libcrypto_error(ERR_peek_error()) == |
| SSH_ERR_KEY_WRONG_PASSPHRASE) |
| return SSH_ERR_KEY_WRONG_PASSPHRASE; |
| return translate_libcrypto_error(ERR_peek_last_error()); |
| } |
| |
| static int |
| pem_passphrase_cb(char *buf, int size, int rwflag, void *u) |
| { |
| char *p = (char *)u; |
| size_t len; |
| |
| if (p == NULL || (len = strlen(p)) == 0) |
| return -1; |
| if (size < 0 || len > (size_t)size) |
| return -1; |
| memcpy(buf, p, len); |
| return (int)len; |
| } |
| |
| static int |
| sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type, |
| const char *passphrase, struct sshkey **keyp) |
| { |
| EVP_PKEY *pk = NULL; |
| struct sshkey *prv = NULL; |
| BIO *bio = NULL; |
| int r; |
| |
| if (keyp != NULL) |
| *keyp = NULL; |
| |
| if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX) |
| return SSH_ERR_ALLOC_FAIL; |
| if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) != |
| (int)sshbuf_len(blob)) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| clear_libcrypto_errors(); |
| if ((pk = PEM_read_bio_PrivateKey(bio, NULL, pem_passphrase_cb, |
| (char *)passphrase)) == NULL) { |
| /* |
| * libcrypto may return various ASN.1 errors when attempting |
| * to parse a key with an incorrect passphrase. |
| * Treat all format errors as "incorrect passphrase" if a |
| * passphrase was supplied. |
| */ |
| if (passphrase != NULL && *passphrase != '\0') |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| else |
| r = convert_libcrypto_error(); |
| goto out; |
| } |
| if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA && |
| (type == KEY_UNSPEC || type == KEY_RSA)) { |
| if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| prv->rsa = EVP_PKEY_get1_RSA(pk); |
| prv->type = KEY_RSA; |
| #ifdef DEBUG_PK |
| RSA_print_fp(stderr, prv->rsa, 8); |
| #endif |
| if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if ((r = check_rsa_length(prv->rsa)) != 0) |
| goto out; |
| } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA && |
| (type == KEY_UNSPEC || type == KEY_DSA)) { |
| if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| prv->dsa = EVP_PKEY_get1_DSA(pk); |
| prv->type = KEY_DSA; |
| #ifdef DEBUG_PK |
| DSA_print_fp(stderr, prv->dsa, 8); |
| #endif |
| #ifdef OPENSSL_HAS_ECC |
| } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC && |
| (type == KEY_UNSPEC || type == KEY_ECDSA)) { |
| if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); |
| prv->type = KEY_ECDSA; |
| prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa); |
| if (prv->ecdsa_nid == -1 || |
| sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL || |
| sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), |
| EC_KEY_get0_public_key(prv->ecdsa)) != 0 || |
| sshkey_ec_validate_private(prv->ecdsa) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| # ifdef DEBUG_PK |
| if (prv != NULL && prv->ecdsa != NULL) |
| sshkey_dump_ec_key(prv->ecdsa); |
| # endif |
| #endif /* OPENSSL_HAS_ECC */ |
| } else { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| r = 0; |
| if (keyp != NULL) { |
| *keyp = prv; |
| prv = NULL; |
| } |
| out: |
| BIO_free(bio); |
| EVP_PKEY_free(pk); |
| sshkey_free(prv); |
| return r; |
| } |
| #endif /* WITH_OPENSSL */ |
| |
| int |
| sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type, |
| const char *passphrase, struct sshkey **keyp, char **commentp) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| switch (type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_RSA: |
| return sshkey_parse_private_pem_fileblob(blob, type, |
| passphrase, keyp); |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| #ifdef WITH_XMSS |
| case KEY_XMSS: |
| #endif /* WITH_XMSS */ |
| return sshkey_parse_private2(blob, type, passphrase, |
| keyp, commentp); |
| case KEY_UNSPEC: |
| r = sshkey_parse_private2(blob, type, passphrase, keyp, |
| commentp); |
| /* Do not fallback to PEM parser if only passphrase is wrong. */ |
| if (r == 0 || r == SSH_ERR_KEY_WRONG_PASSPHRASE) |
| return r; |
| #ifdef WITH_OPENSSL |
| return sshkey_parse_private_pem_fileblob(blob, type, |
| passphrase, keyp); |
| #else |
| return SSH_ERR_INVALID_FORMAT; |
| #endif /* WITH_OPENSSL */ |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| } |
| |
| int |
| sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase, |
| struct sshkey **keyp, char **commentp) |
| { |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC, |
| passphrase, keyp, commentp); |
| } |
| |
| #ifdef WITH_XMSS |
| /* |
| * serialize the key with the current state and forward the state |
| * maxsign times. |
| */ |
| int |
| sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b, |
| u_int32_t maxsign, sshkey_printfn *pr) |
| { |
| int r, rupdate; |
| |
| if (maxsign == 0 || |
| sshkey_type_plain(k->type) != KEY_XMSS) |
| return sshkey_private_serialize_opt(k, b, |
| SSHKEY_SERIALIZE_DEFAULT); |
| if ((r = sshkey_xmss_get_state(k, pr)) != 0 || |
| (r = sshkey_private_serialize_opt(k, b, |
| SSHKEY_SERIALIZE_STATE)) != 0 || |
| (r = sshkey_xmss_forward_state(k, maxsign)) != 0) |
| goto out; |
| r = 0; |
| out: |
| if ((rupdate = sshkey_xmss_update_state(k, pr)) != 0) { |
| if (r == 0) |
| r = rupdate; |
| } |
| return r; |
| } |
| |
| u_int32_t |
| sshkey_signatures_left(const struct sshkey *k) |
| { |
| if (sshkey_type_plain(k->type) == KEY_XMSS) |
| return sshkey_xmss_signatures_left(k); |
| return 0; |
| } |
| |
| int |
| sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign) |
| { |
| if (sshkey_type_plain(k->type) != KEY_XMSS) |
| return SSH_ERR_INVALID_ARGUMENT; |
| return sshkey_xmss_enable_maxsign(k, maxsign); |
| } |
| |
| int |
| sshkey_set_filename(struct sshkey *k, const char *filename) |
| { |
| if (k == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if (sshkey_type_plain(k->type) != KEY_XMSS) |
| return 0; |
| if (filename == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((k->xmss_filename = strdup(filename)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| return 0; |
| } |
| #else |
| int |
| sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b, |
| u_int32_t maxsign, sshkey_printfn *pr) |
| { |
| return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT); |
| } |
| |
| u_int32_t |
| sshkey_signatures_left(const struct sshkey *k) |
| { |
| return 0; |
| } |
| |
| int |
| sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign) |
| { |
| return SSH_ERR_INVALID_ARGUMENT; |
| } |
| |
| int |
| sshkey_set_filename(struct sshkey *k, const char *filename) |
| { |
| if (k == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| return 0; |
| } |
| #endif /* WITH_XMSS */ |