| /* $OpenBSD: sshkey.c,v 1.39 2016/09/26 21:16:11 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 "rsa.h" |
| #include "cipher.h" |
| #include "digest.h" |
| #define SSHKEY_INTERNAL |
| #include "sshkey.h" |
| #include "match.h" |
| |
| /* openssh private key file format */ |
| #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n" |
| #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n" |
| #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1) |
| #define MARK_END_LEN (sizeof(MARK_END) - 1) |
| #define KDFNAME "bcrypt" |
| #define AUTH_MAGIC "openssh-key-v1" |
| #define SALT_LEN 16 |
| #define DEFAULT_CIPHERNAME "aes256-cbc" |
| #define DEFAULT_ROUNDS 16 |
| |
| /* Version identification string for SSH v1 identity files. */ |
| #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n" |
| |
| static int sshkey_from_blob_internal(struct sshbuf *buf, |
| struct sshkey **keyp, int allow_cert); |
| |
| /* Supported key types */ |
| struct keytype { |
| const char *name; |
| const char *shortname; |
| int type; |
| int nid; |
| int cert; |
| int sigonly; |
| }; |
| static const struct keytype keytypes[] = { |
| { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0, 0 }, |
| { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", |
| KEY_ED25519_CERT, 0, 1, 0 }, |
| #ifdef WITH_OPENSSL |
| { NULL, "RSA1", KEY_RSA1, 0, 0, 0 }, |
| { "ssh-rsa", "RSA", KEY_RSA, 0, 0, 0 }, |
| { "rsa-sha2-256", "RSA", KEY_RSA, 0, 0, 1 }, |
| { "rsa-sha2-512", "RSA", KEY_RSA, 0, 0, 1 }, |
| { "ssh-dss", "DSA", KEY_DSA, 0, 0, 0 }, |
| # ifdef OPENSSL_HAS_ECC |
| { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 }, |
| { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0, 0 }, |
| # ifdef OPENSSL_HAS_NISTP521 |
| { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0, 0 }, |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| # endif /* OPENSSL_HAS_ECC */ |
| { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1, 0 }, |
| { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1, 0 }, |
| # ifdef OPENSSL_HAS_ECC |
| { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", |
| KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 }, |
| { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", |
| KEY_ECDSA_CERT, NID_secp384r1, 1, 0 }, |
| # ifdef OPENSSL_HAS_NISTP521 |
| { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", |
| KEY_ECDSA_CERT, NID_secp521r1, 1, 0 }, |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| { NULL, NULL, -1, -1, 0, 0 } |
| }; |
| |
| const char * |
| sshkey_type(const struct sshkey *k) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type == k->type) |
| return kt->shortname; |
| } |
| return "unknown"; |
| } |
| |
| static const char * |
| sshkey_ssh_name_from_type_nid(int type, int nid) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type == type && (kt->nid == 0 || kt->nid == nid)) |
| return kt->name; |
| } |
| return "ssh-unknown"; |
| } |
| |
| int |
| sshkey_type_is_cert(int type) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type == type) |
| return kt->cert; |
| } |
| return 0; |
| } |
| |
| const char * |
| sshkey_ssh_name(const struct sshkey *k) |
| { |
| return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid); |
| } |
| |
| const char * |
| sshkey_ssh_name_plain(const struct sshkey *k) |
| { |
| return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type), |
| k->ecdsa_nid); |
| } |
| |
| int |
| sshkey_type_from_name(const char *name) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| /* Only allow shortname matches for plain key types */ |
| if ((kt->name != NULL && strcmp(name, kt->name) == 0) || |
| (!kt->cert && strcasecmp(kt->shortname, name) == 0)) |
| return kt->type; |
| } |
| return KEY_UNSPEC; |
| } |
| |
| int |
| sshkey_ecdsa_nid_from_name(const char *name) |
| { |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT) |
| continue; |
| if (kt->name != NULL && strcmp(name, kt->name) == 0) |
| return kt->nid; |
| } |
| return -1; |
| } |
| |
| char * |
| sshkey_alg_list(int certs_only, int plain_only, char sep) |
| { |
| char *tmp, *ret = NULL; |
| size_t nlen, rlen = 0; |
| const struct keytype *kt; |
| |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->name == NULL || kt->sigonly) |
| continue; |
| if ((certs_only && !kt->cert) || (plain_only && kt->cert)) |
| continue; |
| if (ret != NULL) |
| ret[rlen++] = sep; |
| nlen = strlen(kt->name); |
| if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) { |
| free(ret); |
| return NULL; |
| } |
| ret = tmp; |
| memcpy(ret + rlen, kt->name, nlen + 1); |
| rlen += nlen; |
| } |
| return ret; |
| } |
| |
| int |
| sshkey_names_valid2(const char *names, int allow_wildcard) |
| { |
| char *s, *cp, *p; |
| const struct keytype *kt; |
| int type; |
| |
| if (names == NULL || strcmp(names, "") == 0) |
| return 0; |
| if ((s = cp = strdup(names)) == NULL) |
| return 0; |
| for ((p = strsep(&cp, ",")); p && *p != '\0'; |
| (p = strsep(&cp, ","))) { |
| type = sshkey_type_from_name(p); |
| if (type == KEY_RSA1) { |
| free(s); |
| return 0; |
| } |
| if (type == KEY_UNSPEC) { |
| if (allow_wildcard) { |
| /* |
| * Try matching key types against the string. |
| * If any has a positive or negative match then |
| * the component is accepted. |
| */ |
| for (kt = keytypes; kt->type != -1; kt++) { |
| if (kt->type == KEY_RSA1) |
| continue; |
| if (match_pattern_list(kt->name, |
| p, 0) != 0) |
| break; |
| } |
| if (kt->type != -1) |
| continue; |
| } |
| free(s); |
| return 0; |
| } |
| } |
| free(s); |
| return 1; |
| } |
| |
| u_int |
| sshkey_size(const struct sshkey *k) |
| { |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA1: |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| return BN_num_bits(k->rsa->n); |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| return BN_num_bits(k->dsa->p); |
| case KEY_ECDSA: |
| case KEY_ECDSA_CERT: |
| return sshkey_curve_nid_to_bits(k->ecdsa_nid); |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| return 256; /* XXX */ |
| } |
| return 0; |
| } |
| |
| static int |
| sshkey_type_is_valid_ca(int type) |
| { |
| switch (type) { |
| case KEY_RSA: |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_ED25519: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| int |
| sshkey_is_cert(const struct sshkey *k) |
| { |
| if (k == NULL) |
| return 0; |
| return sshkey_type_is_cert(k->type); |
| } |
| |
| /* Return the cert-less equivalent to a certified key type */ |
| int |
| sshkey_type_plain(int type) |
| { |
| switch (type) { |
| case KEY_RSA_CERT: |
| return KEY_RSA; |
| case KEY_DSA_CERT: |
| return KEY_DSA; |
| case KEY_ECDSA_CERT: |
| return KEY_ECDSA; |
| case KEY_ED25519_CERT: |
| return KEY_ED25519; |
| default: |
| return type; |
| } |
| } |
| |
| #ifdef WITH_OPENSSL |
| /* XXX: these are really begging for a table-driven approach */ |
| int |
| sshkey_curve_name_to_nid(const char *name) |
| { |
| if (strcmp(name, "nistp256") == 0) |
| return NID_X9_62_prime256v1; |
| else if (strcmp(name, "nistp384") == 0) |
| return NID_secp384r1; |
| # ifdef OPENSSL_HAS_NISTP521 |
| else if (strcmp(name, "nistp521") == 0) |
| return NID_secp521r1; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| else |
| return -1; |
| } |
| |
| u_int |
| sshkey_curve_nid_to_bits(int nid) |
| { |
| switch (nid) { |
| case NID_X9_62_prime256v1: |
| return 256; |
| case NID_secp384r1: |
| return 384; |
| # ifdef OPENSSL_HAS_NISTP521 |
| case NID_secp521r1: |
| return 521; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| default: |
| return 0; |
| } |
| } |
| |
| int |
| sshkey_ecdsa_bits_to_nid(int bits) |
| { |
| switch (bits) { |
| case 256: |
| return NID_X9_62_prime256v1; |
| case 384: |
| return NID_secp384r1; |
| # ifdef OPENSSL_HAS_NISTP521 |
| case 521: |
| return NID_secp521r1; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| default: |
| return -1; |
| } |
| } |
| |
| const char * |
| sshkey_curve_nid_to_name(int nid) |
| { |
| switch (nid) { |
| case NID_X9_62_prime256v1: |
| return "nistp256"; |
| case NID_secp384r1: |
| return "nistp384"; |
| # ifdef OPENSSL_HAS_NISTP521 |
| case NID_secp521r1: |
| return "nistp521"; |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| default: |
| return NULL; |
| } |
| } |
| |
| int |
| sshkey_ec_nid_to_hash_alg(int nid) |
| { |
| int kbits = sshkey_curve_nid_to_bits(nid); |
| |
| if (kbits <= 0) |
| return -1; |
| |
| /* RFC5656 section 6.2.1 */ |
| if (kbits <= 256) |
| return SSH_DIGEST_SHA256; |
| else if (kbits <= 384) |
| return SSH_DIGEST_SHA384; |
| else |
| return SSH_DIGEST_SHA512; |
| } |
| #endif /* WITH_OPENSSL */ |
| |
| static void |
| cert_free(struct sshkey_cert *cert) |
| { |
| u_int i; |
| |
| if (cert == NULL) |
| return; |
| sshbuf_free(cert->certblob); |
| sshbuf_free(cert->critical); |
| sshbuf_free(cert->extensions); |
| free(cert->key_id); |
| for (i = 0; i < cert->nprincipals; i++) |
| free(cert->principals[i]); |
| free(cert->principals); |
| sshkey_free(cert->signature_key); |
| explicit_bzero(cert, sizeof(*cert)); |
| free(cert); |
| } |
| |
| static struct sshkey_cert * |
| cert_new(void) |
| { |
| struct sshkey_cert *cert; |
| |
| if ((cert = calloc(1, sizeof(*cert))) == NULL) |
| return NULL; |
| if ((cert->certblob = sshbuf_new()) == NULL || |
| (cert->critical = sshbuf_new()) == NULL || |
| (cert->extensions = sshbuf_new()) == NULL) { |
| cert_free(cert); |
| return NULL; |
| } |
| cert->key_id = NULL; |
| cert->principals = NULL; |
| cert->signature_key = NULL; |
| return cert; |
| } |
| |
| struct sshkey * |
| sshkey_new(int type) |
| { |
| struct sshkey *k; |
| #ifdef WITH_OPENSSL |
| RSA *rsa; |
| DSA *dsa; |
| #endif /* WITH_OPENSSL */ |
| |
| if ((k = calloc(1, sizeof(*k))) == NULL) |
| return NULL; |
| k->type = type; |
| k->ecdsa = NULL; |
| k->ecdsa_nid = -1; |
| k->dsa = NULL; |
| k->rsa = NULL; |
| k->cert = NULL; |
| k->ed25519_sk = NULL; |
| k->ed25519_pk = NULL; |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA1: |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| if ((rsa = RSA_new()) == NULL || |
| (rsa->n = BN_new()) == NULL || |
| (rsa->e = BN_new()) == NULL) { |
| if (rsa != NULL) |
| RSA_free(rsa); |
| free(k); |
| return NULL; |
| } |
| k->rsa = rsa; |
| break; |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| if ((dsa = DSA_new()) == NULL || |
| (dsa->p = BN_new()) == NULL || |
| (dsa->q = BN_new()) == NULL || |
| (dsa->g = BN_new()) == NULL || |
| (dsa->pub_key = BN_new()) == NULL) { |
| if (dsa != NULL) |
| DSA_free(dsa); |
| free(k); |
| return NULL; |
| } |
| k->dsa = dsa; |
| break; |
| case KEY_ECDSA: |
| case KEY_ECDSA_CERT: |
| /* Cannot do anything until we know the group */ |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| /* no need to prealloc */ |
| break; |
| case KEY_UNSPEC: |
| break; |
| default: |
| free(k); |
| return NULL; |
| break; |
| } |
| |
| if (sshkey_is_cert(k)) { |
| if ((k->cert = cert_new()) == NULL) { |
| sshkey_free(k); |
| return NULL; |
| } |
| } |
| |
| return k; |
| } |
| |
| int |
| sshkey_add_private(struct sshkey *k) |
| { |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA1: |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL) |
| if (bn_maybe_alloc_failed(k->rsa->d) || |
| bn_maybe_alloc_failed(k->rsa->iqmp) || |
| bn_maybe_alloc_failed(k->rsa->q) || |
| bn_maybe_alloc_failed(k->rsa->p) || |
| bn_maybe_alloc_failed(k->rsa->dmq1) || |
| bn_maybe_alloc_failed(k->rsa->dmp1)) |
| return SSH_ERR_ALLOC_FAIL; |
| break; |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| if (bn_maybe_alloc_failed(k->dsa->priv_key)) |
| return SSH_ERR_ALLOC_FAIL; |
| break; |
| #undef bn_maybe_alloc_failed |
| case KEY_ECDSA: |
| case KEY_ECDSA_CERT: |
| /* Cannot do anything until we know the group */ |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| /* no need to prealloc */ |
| break; |
| case KEY_UNSPEC: |
| break; |
| default: |
| return SSH_ERR_INVALID_ARGUMENT; |
| } |
| return 0; |
| } |
| |
| struct sshkey * |
| sshkey_new_private(int type) |
| { |
| struct sshkey *k = sshkey_new(type); |
| |
| if (k == NULL) |
| return NULL; |
| if (sshkey_add_private(k) != 0) { |
| sshkey_free(k); |
| return NULL; |
| } |
| return k; |
| } |
| |
| void |
| sshkey_free(struct sshkey *k) |
| { |
| if (k == NULL) |
| return; |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA1: |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| if (k->rsa != NULL) |
| RSA_free(k->rsa); |
| k->rsa = NULL; |
| break; |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| if (k->dsa != NULL) |
| DSA_free(k->dsa); |
| k->dsa = NULL; |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| case KEY_ECDSA_CERT: |
| if (k->ecdsa != NULL) |
| EC_KEY_free(k->ecdsa); |
| k->ecdsa = NULL; |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| if (k->ed25519_pk) { |
| explicit_bzero(k->ed25519_pk, ED25519_PK_SZ); |
| free(k->ed25519_pk); |
| k->ed25519_pk = NULL; |
| } |
| if (k->ed25519_sk) { |
| explicit_bzero(k->ed25519_sk, ED25519_SK_SZ); |
| free(k->ed25519_sk); |
| k->ed25519_sk = NULL; |
| } |
| break; |
| case KEY_UNSPEC: |
| break; |
| default: |
| break; |
| } |
| if (sshkey_is_cert(k)) |
| cert_free(k->cert); |
| explicit_bzero(k, sizeof(*k)); |
| free(k); |
| } |
| |
| static int |
| cert_compare(struct sshkey_cert *a, struct sshkey_cert *b) |
| { |
| if (a == NULL && b == NULL) |
| return 1; |
| if (a == NULL || b == NULL) |
| return 0; |
| if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob)) |
| return 0; |
| if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob), |
| sshbuf_len(a->certblob)) != 0) |
| return 0; |
| return 1; |
| } |
| |
| /* |
| * Compare public portions of key only, allowing comparisons between |
| * certificates and plain keys too. |
| */ |
| int |
| sshkey_equal_public(const struct sshkey *a, const struct sshkey *b) |
| { |
| #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) |
| BN_CTX *bnctx; |
| #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ |
| |
| if (a == NULL || b == NULL || |
| sshkey_type_plain(a->type) != sshkey_type_plain(b->type)) |
| return 0; |
| |
| switch (a->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA1: |
| case KEY_RSA_CERT: |
| case KEY_RSA: |
| return a->rsa != NULL && b->rsa != NULL && |
| BN_cmp(a->rsa->e, b->rsa->e) == 0 && |
| BN_cmp(a->rsa->n, b->rsa->n) == 0; |
| case KEY_DSA_CERT: |
| case KEY_DSA: |
| return a->dsa != NULL && b->dsa != NULL && |
| BN_cmp(a->dsa->p, b->dsa->p) == 0 && |
| BN_cmp(a->dsa->q, b->dsa->q) == 0 && |
| BN_cmp(a->dsa->g, b->dsa->g) == 0 && |
| BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA_CERT: |
| case KEY_ECDSA: |
| if (a->ecdsa == NULL || b->ecdsa == NULL || |
| EC_KEY_get0_public_key(a->ecdsa) == NULL || |
| EC_KEY_get0_public_key(b->ecdsa) == NULL) |
| return 0; |
| if ((bnctx = BN_CTX_new()) == NULL) |
| return 0; |
| if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa), |
| EC_KEY_get0_group(b->ecdsa), bnctx) != 0 || |
| EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa), |
| EC_KEY_get0_public_key(a->ecdsa), |
| EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) { |
| BN_CTX_free(bnctx); |
| return 0; |
| } |
| BN_CTX_free(bnctx); |
| return 1; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| return a->ed25519_pk != NULL && b->ed25519_pk != NULL && |
| memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0; |
| default: |
| return 0; |
| } |
| /* NOTREACHED */ |
| } |
| |
| int |
| sshkey_equal(const struct sshkey *a, const struct sshkey *b) |
| { |
| if (a == NULL || b == NULL || a->type != b->type) |
| return 0; |
| if (sshkey_is_cert(a)) { |
| if (!cert_compare(a->cert, b->cert)) |
| return 0; |
| } |
| return sshkey_equal_public(a, b); |
| } |
| |
| static int |
| to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain) |
| { |
| int type, ret = SSH_ERR_INTERNAL_ERROR; |
| const char *typename; |
| |
| if (key == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| |
| if (sshkey_is_cert(key)) { |
| if (key->cert == NULL) |
| return SSH_ERR_EXPECTED_CERT; |
| if (sshbuf_len(key->cert->certblob) == 0) |
| return SSH_ERR_KEY_LACKS_CERTBLOB; |
| } |
| type = force_plain ? sshkey_type_plain(key->type) : key->type; |
| typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid); |
| |
| switch (type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| case KEY_ECDSA_CERT: |
| case KEY_RSA_CERT: |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519_CERT: |
| /* Use the existing blob */ |
| /* XXX modified flag? */ |
| if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0) |
| return ret; |
| break; |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| if (key->dsa == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 || |
| (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 || |
| (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 || |
| (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0) |
| return ret; |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if (key->ecdsa == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_cstring(b, |
| sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || |
| (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0) |
| return ret; |
| break; |
| # endif |
| case KEY_RSA: |
| if (key->rsa == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 || |
| (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0) |
| return ret; |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| if (key->ed25519_pk == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((ret = sshbuf_put_cstring(b, typename)) != 0 || |
| (ret = sshbuf_put_string(b, |
| key->ed25519_pk, ED25519_PK_SZ)) != 0) |
| return ret; |
| break; |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| return 0; |
| } |
| |
| int |
| sshkey_putb(const struct sshkey *key, struct sshbuf *b) |
| { |
| return to_blob_buf(key, b, 0); |
| } |
| |
| int |
| sshkey_puts(const struct sshkey *key, struct sshbuf *b) |
| { |
| struct sshbuf *tmp; |
| int r; |
| |
| if ((tmp = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| r = to_blob_buf(key, tmp, 0); |
| if (r == 0) |
| r = sshbuf_put_stringb(b, tmp); |
| sshbuf_free(tmp); |
| return r; |
| } |
| |
| int |
| sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b) |
| { |
| return to_blob_buf(key, b, 1); |
| } |
| |
| static int |
| to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain) |
| { |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| size_t len; |
| struct sshbuf *b = NULL; |
| |
| if (lenp != NULL) |
| *lenp = 0; |
| if (blobp != NULL) |
| *blobp = NULL; |
| if ((b = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((ret = to_blob_buf(key, b, force_plain)) != 0) |
| goto out; |
| len = sshbuf_len(b); |
| if (lenp != NULL) |
| *lenp = len; |
| if (blobp != NULL) { |
| if ((*blobp = malloc(len)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| memcpy(*blobp, sshbuf_ptr(b), len); |
| } |
| ret = 0; |
| out: |
| sshbuf_free(b); |
| return ret; |
| } |
| |
| int |
| sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) |
| { |
| return to_blob(key, blobp, lenp, 0); |
| } |
| |
| int |
| sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) |
| { |
| return to_blob(key, blobp, lenp, 1); |
| } |
| |
| int |
| sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg, |
| u_char **retp, size_t *lenp) |
| { |
| u_char *blob = NULL, *ret = NULL; |
| size_t blob_len = 0; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| if (retp != NULL) |
| *retp = NULL; |
| if (lenp != NULL) |
| *lenp = 0; |
| if (ssh_digest_bytes(dgst_alg) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| |
| if (k->type == KEY_RSA1) { |
| #ifdef WITH_OPENSSL |
| int nlen = BN_num_bytes(k->rsa->n); |
| int elen = BN_num_bytes(k->rsa->e); |
| |
| if (nlen < 0 || elen < 0 || nlen >= INT_MAX - elen) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| blob_len = nlen + elen; |
| if ((blob = malloc(blob_len)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| BN_bn2bin(k->rsa->n, blob); |
| BN_bn2bin(k->rsa->e, blob + nlen); |
| #endif /* WITH_OPENSSL */ |
| } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0) |
| goto out; |
| if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = ssh_digest_memory(dgst_alg, blob, blob_len, |
| ret, SSH_DIGEST_MAX_LENGTH)) != 0) |
| goto out; |
| /* success */ |
| if (retp != NULL) { |
| *retp = ret; |
| ret = NULL; |
| } |
| if (lenp != NULL) |
| *lenp = ssh_digest_bytes(dgst_alg); |
| r = 0; |
| out: |
| free(ret); |
| if (blob != NULL) { |
| explicit_bzero(blob, blob_len); |
| free(blob); |
| } |
| return r; |
| } |
| |
| static char * |
| fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) |
| { |
| char *ret; |
| size_t plen = strlen(alg) + 1; |
| size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1; |
| int r; |
| |
| if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL) |
| return NULL; |
| strlcpy(ret, alg, rlen); |
| strlcat(ret, ":", rlen); |
| if (dgst_raw_len == 0) |
| return ret; |
| if ((r = b64_ntop(dgst_raw, dgst_raw_len, |
| ret + plen, rlen - plen)) == -1) { |
| explicit_bzero(ret, rlen); |
| free(ret); |
| return NULL; |
| } |
| /* Trim padding characters from end */ |
| ret[strcspn(ret, "=")] = '\0'; |
| return ret; |
| } |
| |
| static char * |
| fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) |
| { |
| char *retval, hex[5]; |
| size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2; |
| |
| if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL) |
| return NULL; |
| strlcpy(retval, alg, rlen); |
| strlcat(retval, ":", rlen); |
| for (i = 0; i < dgst_raw_len; i++) { |
| snprintf(hex, sizeof(hex), "%s%02x", |
| i > 0 ? ":" : "", dgst_raw[i]); |
| strlcat(retval, hex, rlen); |
| } |
| return retval; |
| } |
| |
| static char * |
| fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len) |
| { |
| char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; |
| char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', |
| 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; |
| u_int i, j = 0, rounds, seed = 1; |
| char *retval; |
| |
| rounds = (dgst_raw_len / 2) + 1; |
| if ((retval = calloc(rounds, 6)) == NULL) |
| return NULL; |
| retval[j++] = 'x'; |
| for (i = 0; i < rounds; i++) { |
| u_int idx0, idx1, idx2, idx3, idx4; |
| if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
| idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + |
| seed) % 6; |
| idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
| idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + |
| (seed / 6)) % 6; |
| retval[j++] = vowels[idx0]; |
| retval[j++] = consonants[idx1]; |
| retval[j++] = vowels[idx2]; |
| if ((i + 1) < rounds) { |
| idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; |
| idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; |
| retval[j++] = consonants[idx3]; |
| retval[j++] = '-'; |
| retval[j++] = consonants[idx4]; |
| seed = ((seed * 5) + |
| ((((u_int)(dgst_raw[2 * i])) * 7) + |
| ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; |
| } |
| } else { |
| idx0 = seed % 6; |
| idx1 = 16; |
| idx2 = seed / 6; |
| retval[j++] = vowels[idx0]; |
| retval[j++] = consonants[idx1]; |
| retval[j++] = vowels[idx2]; |
| } |
| } |
| retval[j++] = 'x'; |
| retval[j++] = '\0'; |
| return retval; |
| } |
| |
| /* |
| * Draw an ASCII-Art representing the fingerprint so human brain can |
| * profit from its built-in pattern recognition ability. |
| * This technique is called "random art" and can be found in some |
| * scientific publications like this original paper: |
| * |
| * "Hash Visualization: a New Technique to improve Real-World Security", |
| * Perrig A. and Song D., 1999, International Workshop on Cryptographic |
| * Techniques and E-Commerce (CrypTEC '99) |
| * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf |
| * |
| * The subject came up in a talk by Dan Kaminsky, too. |
| * |
| * If you see the picture is different, the key is different. |
| * If the picture looks the same, you still know nothing. |
| * |
| * The algorithm used here is a worm crawling over a discrete plane, |
| * leaving a trace (augmenting the field) everywhere it goes. |
| * Movement is taken from dgst_raw 2bit-wise. Bumping into walls |
| * makes the respective movement vector be ignored for this turn. |
| * Graphs are not unambiguous, because circles in graphs can be |
| * walked in either direction. |
| */ |
| |
| /* |
| * Field sizes for the random art. Have to be odd, so the starting point |
| * can be in the exact middle of the picture, and FLDBASE should be >=8 . |
| * Else pictures would be too dense, and drawing the frame would |
| * fail, too, because the key type would not fit in anymore. |
| */ |
| #define FLDBASE 8 |
| #define FLDSIZE_Y (FLDBASE + 1) |
| #define FLDSIZE_X (FLDBASE * 2 + 1) |
| static char * |
| fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len, |
| const struct sshkey *k) |
| { |
| /* |
| * Chars to be used after each other every time the worm |
| * intersects with itself. Matter of taste. |
| */ |
| char *augmentation_string = " .o+=*BOX@%&#/^SE"; |
| char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X]; |
| u_char field[FLDSIZE_X][FLDSIZE_Y]; |
| size_t i, tlen, hlen; |
| u_int b; |
| int x, y, r; |
| size_t len = strlen(augmentation_string) - 1; |
| |
| if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL) |
| return NULL; |
| |
| /* initialize field */ |
| memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); |
| x = FLDSIZE_X / 2; |
| y = FLDSIZE_Y / 2; |
| |
| /* process raw key */ |
| for (i = 0; i < dgst_raw_len; i++) { |
| int input; |
| /* each byte conveys four 2-bit move commands */ |
| input = dgst_raw[i]; |
| for (b = 0; b < 4; b++) { |
| /* evaluate 2 bit, rest is shifted later */ |
| x += (input & 0x1) ? 1 : -1; |
| y += (input & 0x2) ? 1 : -1; |
| |
| /* assure we are still in bounds */ |
| x = MAXIMUM(x, 0); |
| y = MAXIMUM(y, 0); |
| x = MINIMUM(x, FLDSIZE_X - 1); |
| y = MINIMUM(y, FLDSIZE_Y - 1); |
| |
| /* augment the field */ |
| if (field[x][y] < len - 2) |
| field[x][y]++; |
| input = input >> 2; |
| } |
| } |
| |
| /* mark starting point and end point*/ |
| field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; |
| field[x][y] = len; |
| |
| /* assemble title */ |
| r = snprintf(title, sizeof(title), "[%s %u]", |
| sshkey_type(k), sshkey_size(k)); |
| /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */ |
| if (r < 0 || r > (int)sizeof(title)) |
| r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k)); |
| tlen = (r <= 0) ? 0 : strlen(title); |
| |
| /* assemble hash ID. */ |
| r = snprintf(hash, sizeof(hash), "[%s]", alg); |
| hlen = (r <= 0) ? 0 : strlen(hash); |
| |
| /* output upper border */ |
| p = retval; |
| *p++ = '+'; |
| for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++) |
| *p++ = '-'; |
| memcpy(p, title, tlen); |
| p += tlen; |
| for (i += tlen; i < FLDSIZE_X; i++) |
| *p++ = '-'; |
| *p++ = '+'; |
| *p++ = '\n'; |
| |
| /* output content */ |
| for (y = 0; y < FLDSIZE_Y; y++) { |
| *p++ = '|'; |
| for (x = 0; x < FLDSIZE_X; x++) |
| *p++ = augmentation_string[MINIMUM(field[x][y], len)]; |
| *p++ = '|'; |
| *p++ = '\n'; |
| } |
| |
| /* output lower border */ |
| *p++ = '+'; |
| for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++) |
| *p++ = '-'; |
| memcpy(p, hash, hlen); |
| p += hlen; |
| for (i += hlen; i < FLDSIZE_X; i++) |
| *p++ = '-'; |
| *p++ = '+'; |
| |
| return retval; |
| } |
| |
| char * |
| sshkey_fingerprint(const struct sshkey *k, int dgst_alg, |
| enum sshkey_fp_rep dgst_rep) |
| { |
| char *retval = NULL; |
| u_char *dgst_raw; |
| size_t dgst_raw_len; |
| |
| if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0) |
| return NULL; |
| switch (dgst_rep) { |
| case SSH_FP_DEFAULT: |
| if (dgst_alg == SSH_DIGEST_MD5) { |
| retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| } else { |
| retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| } |
| break; |
| case SSH_FP_HEX: |
| retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| break; |
| case SSH_FP_BASE64: |
| retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len); |
| break; |
| case SSH_FP_BUBBLEBABBLE: |
| retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len); |
| break; |
| case SSH_FP_RANDOMART: |
| retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg), |
| dgst_raw, dgst_raw_len, k); |
| break; |
| default: |
| explicit_bzero(dgst_raw, dgst_raw_len); |
| free(dgst_raw); |
| return NULL; |
| } |
| explicit_bzero(dgst_raw, dgst_raw_len); |
| free(dgst_raw); |
| return retval; |
| } |
| |
| #ifdef WITH_SSH1 |
| /* |
| * Reads a multiple-precision integer in decimal from the buffer, and advances |
| * the pointer. The integer must already be initialized. This function is |
| * permitted to modify the buffer. This leaves *cpp to point just beyond the |
| * last processed character. |
| */ |
| static int |
| read_decimal_bignum(char **cpp, BIGNUM *v) |
| { |
| char *cp; |
| size_t e; |
| int skip = 1; /* skip white space */ |
| |
| cp = *cpp; |
| while (*cp == ' ' || *cp == '\t') |
| cp++; |
| e = strspn(cp, "0123456789"); |
| if (e == 0) |
| return SSH_ERR_INVALID_FORMAT; |
| if (e > SSHBUF_MAX_BIGNUM * 3) |
| return SSH_ERR_BIGNUM_TOO_LARGE; |
| if (cp[e] == '\0') |
| skip = 0; |
| else if (strchr(" \t\r\n", cp[e]) == NULL) |
| return SSH_ERR_INVALID_FORMAT; |
| cp[e] = '\0'; |
| if (BN_dec2bn(&v, cp) <= 0) |
| return SSH_ERR_INVALID_FORMAT; |
| *cpp = cp + e + skip; |
| return 0; |
| } |
| #endif /* WITH_SSH1 */ |
| |
| /* returns 0 ok, and < 0 error */ |
| int |
| sshkey_read(struct sshkey *ret, char **cpp) |
| { |
| struct sshkey *k; |
| int retval = SSH_ERR_INVALID_FORMAT; |
| char *ep, *cp, *space; |
| int r, type, curve_nid = -1; |
| struct sshbuf *blob; |
| #ifdef WITH_SSH1 |
| u_long bits; |
| #endif /* WITH_SSH1 */ |
| |
| cp = *cpp; |
| |
| switch (ret->type) { |
| case KEY_RSA1: |
| #ifdef WITH_SSH1 |
| /* Get number of bits. */ |
| bits = strtoul(cp, &ep, 10); |
| if (*cp == '\0' || strchr(" \t\r\n", *ep) == NULL || |
| bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8) |
| return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */ |
| /* Get public exponent, public modulus. */ |
| if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0) |
| return r; |
| if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0) |
| return r; |
| /* validate the claimed number of bits */ |
| if (BN_num_bits(ret->rsa->n) != (int)bits) |
| return SSH_ERR_KEY_BITS_MISMATCH; |
| *cpp = ep; |
| retval = 0; |
| #endif /* WITH_SSH1 */ |
| break; |
| case KEY_UNSPEC: |
| case KEY_RSA: |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_ED25519: |
| case KEY_DSA_CERT: |
| case KEY_ECDSA_CERT: |
| case KEY_RSA_CERT: |
| case KEY_ED25519_CERT: |
| space = strchr(cp, ' '); |
| if (space == NULL) |
| return SSH_ERR_INVALID_FORMAT; |
| *space = '\0'; |
| type = sshkey_type_from_name(cp); |
| if (sshkey_type_plain(type) == KEY_ECDSA && |
| (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1) |
| return SSH_ERR_EC_CURVE_INVALID; |
| *space = ' '; |
| if (type == KEY_UNSPEC) |
| return SSH_ERR_INVALID_FORMAT; |
| cp = space+1; |
| if (*cp == '\0') |
| return SSH_ERR_INVALID_FORMAT; |
| if (ret->type != KEY_UNSPEC && ret->type != type) |
| return SSH_ERR_KEY_TYPE_MISMATCH; |
| if ((blob = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| /* trim comment */ |
| space = strchr(cp, ' '); |
| if (space) { |
| /* advance 'space': skip whitespace */ |
| *space++ = '\0'; |
| while (*space == ' ' || *space == '\t') |
| space++; |
| ep = space; |
| } else |
| ep = cp + strlen(cp); |
| if ((r = sshbuf_b64tod(blob, cp)) != 0) { |
| sshbuf_free(blob); |
| return r; |
| } |
| if ((r = sshkey_from_blob(sshbuf_ptr(blob), |
| sshbuf_len(blob), &k)) != 0) { |
| sshbuf_free(blob); |
| return r; |
| } |
| sshbuf_free(blob); |
| if (k->type != type) { |
| sshkey_free(k); |
| return SSH_ERR_KEY_TYPE_MISMATCH; |
| } |
| if (sshkey_type_plain(type) == KEY_ECDSA && |
| curve_nid != k->ecdsa_nid) { |
| sshkey_free(k); |
| return SSH_ERR_EC_CURVE_MISMATCH; |
| } |
| ret->type = type; |
| if (sshkey_is_cert(ret)) { |
| if (!sshkey_is_cert(k)) { |
| sshkey_free(k); |
| return SSH_ERR_EXPECTED_CERT; |
| } |
| if (ret->cert != NULL) |
| cert_free(ret->cert); |
| ret->cert = k->cert; |
| k->cert = NULL; |
| } |
| switch (sshkey_type_plain(ret->type)) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| if (ret->rsa != NULL) |
| RSA_free(ret->rsa); |
| ret->rsa = k->rsa; |
| k->rsa = NULL; |
| #ifdef DEBUG_PK |
| RSA_print_fp(stderr, ret->rsa, 8); |
| #endif |
| break; |
| case KEY_DSA: |
| if (ret->dsa != NULL) |
| DSA_free(ret->dsa); |
| ret->dsa = k->dsa; |
| k->dsa = NULL; |
| #ifdef DEBUG_PK |
| DSA_print_fp(stderr, ret->dsa, 8); |
| #endif |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if (ret->ecdsa != NULL) |
| EC_KEY_free(ret->ecdsa); |
| ret->ecdsa = k->ecdsa; |
| ret->ecdsa_nid = k->ecdsa_nid; |
| k->ecdsa = NULL; |
| k->ecdsa_nid = -1; |
| #ifdef DEBUG_PK |
| sshkey_dump_ec_key(ret->ecdsa); |
| #endif |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| free(ret->ed25519_pk); |
| ret->ed25519_pk = k->ed25519_pk; |
| k->ed25519_pk = NULL; |
| #ifdef DEBUG_PK |
| /* XXX */ |
| #endif |
| break; |
| } |
| *cpp = ep; |
| retval = 0; |
| /*XXXX*/ |
| sshkey_free(k); |
| if (retval != 0) |
| break; |
| break; |
| default: |
| return SSH_ERR_INVALID_ARGUMENT; |
| } |
| return retval; |
| } |
| |
| int |
| sshkey_to_base64(const struct sshkey *key, char **b64p) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| struct sshbuf *b = NULL; |
| char *uu = NULL; |
| |
| if (b64p != NULL) |
| *b64p = NULL; |
| if ((b = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((r = sshkey_putb(key, b)) != 0) |
| goto out; |
| if ((uu = sshbuf_dtob64(b)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| /* Success */ |
| if (b64p != NULL) { |
| *b64p = uu; |
| uu = NULL; |
| } |
| r = 0; |
| out: |
| sshbuf_free(b); |
| free(uu); |
| return r; |
| } |
| |
| static int |
| sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| #ifdef WITH_SSH1 |
| u_int bits = 0; |
| char *dec_e = NULL, *dec_n = NULL; |
| |
| if (key->rsa == NULL || key->rsa->e == NULL || |
| key->rsa->n == NULL) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL || |
| (dec_n = BN_bn2dec(key->rsa->n)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| /* size of modulus 'n' */ |
| if ((bits = BN_num_bits(key->rsa->n)) <= 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0) |
| goto out; |
| |
| /* Success */ |
| r = 0; |
| out: |
| if (dec_e != NULL) |
| OPENSSL_free(dec_e); |
| if (dec_n != NULL) |
| OPENSSL_free(dec_n); |
| #endif /* WITH_SSH1 */ |
| |
| return r; |
| } |
| |
| static int |
| sshkey_format_text(const struct sshkey *key, struct sshbuf *b) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| char *uu = NULL; |
| |
| if (key->type == KEY_RSA1) { |
| if ((r = sshkey_format_rsa1(key, b)) != 0) |
| goto out; |
| } else { |
| /* Unsupported key types handled in sshkey_to_base64() */ |
| if ((r = sshkey_to_base64(key, &uu)) != 0) |
| goto out; |
| if ((r = sshbuf_putf(b, "%s %s", |
| sshkey_ssh_name(key), uu)) != 0) |
| goto out; |
| } |
| r = 0; |
| out: |
| free(uu); |
| return r; |
| } |
| |
| int |
| sshkey_write(const struct sshkey *key, FILE *f) |
| { |
| struct sshbuf *b = NULL; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| if ((b = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((r = sshkey_format_text(key, b)) != 0) |
| goto out; |
| if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) { |
| if (feof(f)) |
| errno = EPIPE; |
| r = SSH_ERR_SYSTEM_ERROR; |
| goto out; |
| } |
| /* Success */ |
| r = 0; |
| out: |
| sshbuf_free(b); |
| return r; |
| } |
| |
| const char * |
| sshkey_cert_type(const struct sshkey *k) |
| { |
| switch (k->cert->type) { |
| case SSH2_CERT_TYPE_USER: |
| return "user"; |
| case SSH2_CERT_TYPE_HOST: |
| return "host"; |
| default: |
| return "unknown"; |
| } |
| } |
| |
| #ifdef WITH_OPENSSL |
| static int |
| rsa_generate_private_key(u_int bits, RSA **rsap) |
| { |
| RSA *private = NULL; |
| BIGNUM *f4 = NULL; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| if (rsap == NULL || |
| bits < SSH_RSA_MINIMUM_MODULUS_SIZE || |
| bits > SSHBUF_MAX_BIGNUM * 8) |
| return SSH_ERR_INVALID_ARGUMENT; |
| *rsap = NULL; |
| if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (!BN_set_word(f4, RSA_F4) || |
| !RSA_generate_key_ex(private, bits, f4, NULL)) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| *rsap = private; |
| private = NULL; |
| ret = 0; |
| out: |
| if (private != NULL) |
| RSA_free(private); |
| if (f4 != NULL) |
| BN_free(f4); |
| return ret; |
| } |
| |
| static int |
| dsa_generate_private_key(u_int bits, DSA **dsap) |
| { |
| DSA *private; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| if (dsap == NULL || bits != 1024) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if ((private = DSA_new()) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| *dsap = NULL; |
| if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL, |
| NULL, NULL) || !DSA_generate_key(private)) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| *dsap = private; |
| private = NULL; |
| ret = 0; |
| out: |
| if (private != NULL) |
| DSA_free(private); |
| return ret; |
| } |
| |
| # ifdef OPENSSL_HAS_ECC |
| int |
| sshkey_ecdsa_key_to_nid(EC_KEY *k) |
| { |
| EC_GROUP *eg; |
| int nids[] = { |
| NID_X9_62_prime256v1, |
| NID_secp384r1, |
| # ifdef OPENSSL_HAS_NISTP521 |
| NID_secp521r1, |
| # endif /* OPENSSL_HAS_NISTP521 */ |
| -1 |
| }; |
| int nid; |
| u_int i; |
| BN_CTX *bnctx; |
| const EC_GROUP *g = EC_KEY_get0_group(k); |
| |
| /* |
| * The group may be stored in a ASN.1 encoded private key in one of two |
| * ways: as a "named group", which is reconstituted by ASN.1 object ID |
| * or explicit group parameters encoded into the key blob. Only the |
| * "named group" case sets the group NID for us, but we can figure |
| * it out for the other case by comparing against all the groups that |
| * are supported. |
| */ |
| if ((nid = EC_GROUP_get_curve_name(g)) > 0) |
| return nid; |
| if ((bnctx = BN_CTX_new()) == NULL) |
| return -1; |
| for (i = 0; nids[i] != -1; i++) { |
| if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) { |
| BN_CTX_free(bnctx); |
| return -1; |
| } |
| if (EC_GROUP_cmp(g, eg, bnctx) == 0) |
| break; |
| EC_GROUP_free(eg); |
| } |
| BN_CTX_free(bnctx); |
| if (nids[i] != -1) { |
| /* Use the group with the NID attached */ |
| EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE); |
| if (EC_KEY_set_group(k, eg) != 1) { |
| EC_GROUP_free(eg); |
| return -1; |
| } |
| } |
| return nids[i]; |
| } |
| |
| static int |
| ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap) |
| { |
| EC_KEY *private; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| if (nid == NULL || ecdsap == NULL || |
| (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1) |
| return SSH_ERR_INVALID_ARGUMENT; |
| *ecdsap = NULL; |
| if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (EC_KEY_generate_key(private) != 1) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE); |
| *ecdsap = private; |
| private = NULL; |
| ret = 0; |
| out: |
| if (private != NULL) |
| EC_KEY_free(private); |
| return ret; |
| } |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| |
| int |
| sshkey_generate(int type, u_int bits, struct sshkey **keyp) |
| { |
| struct sshkey *k; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| if (keyp == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| *keyp = NULL; |
| if ((k = sshkey_new(KEY_UNSPEC)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| switch (type) { |
| case KEY_ED25519: |
| if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL || |
| (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| break; |
| } |
| crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk); |
| ret = 0; |
| break; |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| ret = dsa_generate_private_key(bits, &k->dsa); |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid, |
| &k->ecdsa); |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA: |
| case KEY_RSA1: |
| ret = rsa_generate_private_key(bits, &k->rsa); |
| break; |
| #endif /* WITH_OPENSSL */ |
| default: |
| ret = SSH_ERR_INVALID_ARGUMENT; |
| } |
| if (ret == 0) { |
| k->type = type; |
| *keyp = k; |
| } else |
| sshkey_free(k); |
| return ret; |
| } |
| |
| int |
| sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key) |
| { |
| u_int i; |
| const struct sshkey_cert *from; |
| struct sshkey_cert *to; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| if (to_key->cert != NULL) { |
| cert_free(to_key->cert); |
| to_key->cert = NULL; |
| } |
| |
| if ((from = from_key->cert) == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| |
| if ((to = to_key->cert = cert_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| |
| if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 || |
| (ret = sshbuf_putb(to->critical, from->critical)) != 0 || |
| (ret = sshbuf_putb(to->extensions, from->extensions)) != 0) |
| return ret; |
| |
| to->serial = from->serial; |
| to->type = from->type; |
| if (from->key_id == NULL) |
| to->key_id = NULL; |
| else if ((to->key_id = strdup(from->key_id)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| to->valid_after = from->valid_after; |
| to->valid_before = from->valid_before; |
| if (from->signature_key == NULL) |
| to->signature_key = NULL; |
| else if ((ret = sshkey_from_private(from->signature_key, |
| &to->signature_key)) != 0) |
| return ret; |
| |
| if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if (from->nprincipals > 0) { |
| if ((to->principals = calloc(from->nprincipals, |
| sizeof(*to->principals))) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| for (i = 0; i < from->nprincipals; i++) { |
| to->principals[i] = strdup(from->principals[i]); |
| if (to->principals[i] == NULL) { |
| to->nprincipals = i; |
| return SSH_ERR_ALLOC_FAIL; |
| } |
| } |
| } |
| to->nprincipals = from->nprincipals; |
| return 0; |
| } |
| |
| int |
| sshkey_from_private(const struct sshkey *k, struct sshkey **pkp) |
| { |
| struct sshkey *n = NULL; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| *pkp = NULL; |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| case KEY_DSA_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || |
| (BN_copy(n->dsa->q, k->dsa->q) == NULL) || |
| (BN_copy(n->dsa->g, k->dsa->g) == NULL) || |
| (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) { |
| sshkey_free(n); |
| return SSH_ERR_ALLOC_FAIL; |
| } |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| case KEY_ECDSA_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| n->ecdsa_nid = k->ecdsa_nid; |
| n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); |
| if (n->ecdsa == NULL) { |
| sshkey_free(n); |
| return SSH_ERR_ALLOC_FAIL; |
| } |
| if (EC_KEY_set_public_key(n->ecdsa, |
| EC_KEY_get0_public_key(k->ecdsa)) != 1) { |
| sshkey_free(n); |
| return SSH_ERR_LIBCRYPTO_ERROR; |
| } |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA: |
| case KEY_RSA1: |
| case KEY_RSA_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || |
| (BN_copy(n->rsa->e, k->rsa->e) == NULL)) { |
| sshkey_free(n); |
| return SSH_ERR_ALLOC_FAIL; |
| } |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| if ((n = sshkey_new(k->type)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if (k->ed25519_pk != NULL) { |
| if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { |
| sshkey_free(n); |
| return SSH_ERR_ALLOC_FAIL; |
| } |
| memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); |
| } |
| break; |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| if (sshkey_is_cert(k)) { |
| if ((ret = sshkey_cert_copy(k, n)) != 0) { |
| sshkey_free(n); |
| return ret; |
| } |
| } |
| *pkp = n; |
| return 0; |
| } |
| |
| static int |
| cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf) |
| { |
| struct sshbuf *principals = NULL, *crit = NULL; |
| struct sshbuf *exts = NULL, *ca = NULL; |
| u_char *sig = NULL; |
| size_t signed_len = 0, slen = 0, kidlen = 0; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| /* Copy the entire key blob for verification and later serialisation */ |
| if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0) |
| return ret; |
| |
| /* Parse body of certificate up to signature */ |
| if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 || |
| (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 || |
| (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 || |
| (ret = sshbuf_froms(b, &principals)) != 0 || |
| (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 || |
| (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 || |
| (ret = sshbuf_froms(b, &crit)) != 0 || |
| (ret = sshbuf_froms(b, &exts)) != 0 || |
| (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || |
| (ret = sshbuf_froms(b, &ca)) != 0) { |
| /* XXX debug print error for ret */ |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* Signature is left in the buffer so we can calculate this length */ |
| signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b); |
| |
| if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| if (key->cert->type != SSH2_CERT_TYPE_USER && |
| key->cert->type != SSH2_CERT_TYPE_HOST) { |
| ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE; |
| goto out; |
| } |
| |
| /* Parse principals section */ |
| while (sshbuf_len(principals) > 0) { |
| char *principal = NULL; |
| char **oprincipals = NULL; |
| |
| if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if ((ret = sshbuf_get_cstring(principals, &principal, |
| NULL)) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| oprincipals = key->cert->principals; |
| key->cert->principals = reallocarray(key->cert->principals, |
| key->cert->nprincipals + 1, sizeof(*key->cert->principals)); |
| if (key->cert->principals == NULL) { |
| free(principal); |
| key->cert->principals = oprincipals; |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| key->cert->principals[key->cert->nprincipals++] = principal; |
| } |
| |
| /* |
| * Stash a copies of the critical options and extensions sections |
| * for later use. |
| */ |
| if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 || |
| (exts != NULL && |
| (ret = sshbuf_putb(key->cert->extensions, exts)) != 0)) |
| goto out; |
| |
| /* |
| * Validate critical options and extensions sections format. |
| */ |
| while (sshbuf_len(crit) != 0) { |
| if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 || |
| (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) { |
| sshbuf_reset(key->cert->critical); |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| while (exts != NULL && sshbuf_len(exts) != 0) { |
| if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 || |
| (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) { |
| sshbuf_reset(key->cert->extensions); |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| |
| /* Parse CA key and check signature */ |
| if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) { |
| ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| goto out; |
| } |
| if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) { |
| ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| goto out; |
| } |
| if ((ret = sshkey_verify(key->cert->signature_key, sig, slen, |
| sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0) |
| goto out; |
| |
| /* Success */ |
| ret = 0; |
| out: |
| sshbuf_free(ca); |
| sshbuf_free(crit); |
| sshbuf_free(exts); |
| sshbuf_free(principals); |
| free(sig); |
| return ret; |
| } |
| |
| static int |
| sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp, |
| int allow_cert) |
| { |
| int type, ret = SSH_ERR_INTERNAL_ERROR; |
| char *ktype = NULL, *curve = NULL; |
| struct sshkey *key = NULL; |
| size_t len; |
| u_char *pk = NULL; |
| struct sshbuf *copy; |
| #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) |
| EC_POINT *q = NULL; |
| #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ |
| |
| #ifdef DEBUG_PK /* XXX */ |
| sshbuf_dump(b, stderr); |
| #endif |
| if (keyp != NULL) |
| *keyp = NULL; |
| if ((copy = sshbuf_fromb(b)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_cstring(b, &ktype, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| type = sshkey_type_from_name(ktype); |
| if (!allow_cert && sshkey_type_is_cert(type)) { |
| ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| goto out; |
| } |
| switch (type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| case KEY_RSA: |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_bignum2(b, key->rsa->e) != 0 || |
| sshbuf_get_bignum2(b, key->rsa->n) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| #ifdef DEBUG_PK |
| RSA_print_fp(stderr, key->rsa, 8); |
| #endif |
| break; |
| case KEY_DSA_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| case KEY_DSA: |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_bignum2(b, key->dsa->p) != 0 || |
| sshbuf_get_bignum2(b, key->dsa->q) != 0 || |
| sshbuf_get_bignum2(b, key->dsa->g) != 0 || |
| sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| #ifdef DEBUG_PK |
| DSA_print_fp(stderr, key->dsa, 8); |
| #endif |
| break; |
| case KEY_ECDSA_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype); |
| if (sshbuf_get_cstring(b, &curve, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { |
| ret = SSH_ERR_EC_CURVE_MISMATCH; |
| goto out; |
| } |
| if (key->ecdsa != NULL) |
| EC_KEY_free(key->ecdsa); |
| if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) |
| == NULL) { |
| ret = SSH_ERR_EC_CURVE_INVALID; |
| goto out; |
| } |
| if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), |
| q) != 0) { |
| ret = SSH_ERR_KEY_INVALID_EC_VALUE; |
| goto out; |
| } |
| if (EC_KEY_set_public_key(key->ecdsa, q) != 1) { |
| /* XXX assume it is a allocation error */ |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| #ifdef DEBUG_PK |
| sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q); |
| #endif |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519_CERT: |
| /* Skip nonce */ |
| if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* FALLTHROUGH */ |
| case KEY_ED25519: |
| if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) |
| goto out; |
| if (len != ED25519_PK_SZ) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| key->ed25519_pk = pk; |
| pk = NULL; |
| break; |
| case KEY_UNSPEC: |
| if ((key = sshkey_new(type)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| break; |
| default: |
| ret = SSH_ERR_KEY_TYPE_UNKNOWN; |
| goto out; |
| } |
| |
| /* Parse certificate potion */ |
| if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0) |
| goto out; |
| |
| if (key != NULL && sshbuf_len(b) != 0) { |
| ret = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| ret = 0; |
| if (keyp != NULL) { |
| *keyp = key; |
| key = NULL; |
| } |
| out: |
| sshbuf_free(copy); |
| sshkey_free(key); |
| free(ktype); |
| free(curve); |
| free(pk); |
| #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) |
| if (q != NULL) |
| EC_POINT_free(q); |
| #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ |
| return ret; |
| } |
| |
| int |
| sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp) |
| { |
| struct sshbuf *b; |
| int r; |
| |
| if ((b = sshbuf_from(blob, blen)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| r = sshkey_from_blob_internal(b, keyp, 1); |
| sshbuf_free(b); |
| return r; |
| } |
| |
| int |
| sshkey_fromb(struct sshbuf *b, struct sshkey **keyp) |
| { |
| return sshkey_from_blob_internal(b, keyp, 1); |
| } |
| |
| int |
| sshkey_froms(struct sshbuf *buf, struct sshkey **keyp) |
| { |
| struct sshbuf *b; |
| int r; |
| |
| if ((r = sshbuf_froms(buf, &b)) != 0) |
| return r; |
| r = sshkey_from_blob_internal(b, keyp, 1); |
| sshbuf_free(b); |
| return r; |
| } |
| |
| int |
| sshkey_sign(const struct sshkey *key, |
| u_char **sigp, size_t *lenp, |
| const u_char *data, size_t datalen, const char *alg, u_int compat) |
| { |
| if (sigp != NULL) |
| *sigp = NULL; |
| if (lenp != NULL) |
| *lenp = 0; |
| if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) |
| return SSH_ERR_INVALID_ARGUMENT; |
| switch (key->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| case KEY_DSA: |
| return ssh_dss_sign(key, sigp, lenp, data, datalen, compat); |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA_CERT: |
| case KEY_ECDSA: |
| return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat); |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA_CERT: |
| case KEY_RSA: |
| return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg); |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat); |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| } |
| |
| /* |
| * ssh_key_verify returns 0 for a correct signature and < 0 on error. |
| */ |
| int |
| sshkey_verify(const struct sshkey *key, |
| const u_char *sig, size_t siglen, |
| const u_char *data, size_t dlen, u_int compat) |
| { |
| if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE) |
| return SSH_ERR_INVALID_ARGUMENT; |
| switch (key->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| case KEY_DSA: |
| return ssh_dss_verify(key, sig, siglen, data, dlen, compat); |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA_CERT: |
| case KEY_ECDSA: |
| return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat); |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA_CERT: |
| case KEY_RSA: |
| return ssh_rsa_verify(key, sig, siglen, data, dlen); |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| case KEY_ED25519_CERT: |
| return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat); |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| } |
| |
| /* Converts a private to a public key */ |
| int |
| sshkey_demote(const struct sshkey *k, struct sshkey **dkp) |
| { |
| struct sshkey *pk; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| |
| *dkp = NULL; |
| if ((pk = calloc(1, sizeof(*pk))) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| pk->type = k->type; |
| pk->flags = k->flags; |
| pk->ecdsa_nid = k->ecdsa_nid; |
| pk->dsa = NULL; |
| pk->ecdsa = NULL; |
| pk->rsa = NULL; |
| pk->ed25519_pk = NULL; |
| pk->ed25519_sk = NULL; |
| |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA_CERT: |
| if ((ret = sshkey_cert_copy(k, pk)) != 0) |
| goto fail; |
| /* FALLTHROUGH */ |
| case KEY_RSA1: |
| case KEY_RSA: |
| if ((pk->rsa = RSA_new()) == NULL || |
| (pk->rsa->e = BN_dup(k->rsa->e)) == NULL || |
| (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto fail; |
| } |
| break; |
| case KEY_DSA_CERT: |
| if ((ret = sshkey_cert_copy(k, pk)) != 0) |
| goto fail; |
| /* FALLTHROUGH */ |
| case KEY_DSA: |
| if ((pk->dsa = DSA_new()) == NULL || |
| (pk->dsa->p = BN_dup(k->dsa->p)) == NULL || |
| (pk->dsa->q = BN_dup(k->dsa->q)) == NULL || |
| (pk->dsa->g = BN_dup(k->dsa->g)) == NULL || |
| (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto fail; |
| } |
| break; |
| case KEY_ECDSA_CERT: |
| if ((ret = sshkey_cert_copy(k, pk)) != 0) |
| goto fail; |
| /* FALLTHROUGH */ |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid); |
| if (pk->ecdsa == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto fail; |
| } |
| if (EC_KEY_set_public_key(pk->ecdsa, |
| EC_KEY_get0_public_key(k->ecdsa)) != 1) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto fail; |
| } |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519_CERT: |
| if ((ret = sshkey_cert_copy(k, pk)) != 0) |
| goto fail; |
| /* FALLTHROUGH */ |
| case KEY_ED25519: |
| if (k->ed25519_pk != NULL) { |
| if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto fail; |
| } |
| memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); |
| } |
| break; |
| default: |
| ret = SSH_ERR_KEY_TYPE_UNKNOWN; |
| fail: |
| sshkey_free(pk); |
| return ret; |
| } |
| *dkp = pk; |
| return 0; |
| } |
| |
| /* Convert a plain key to their _CERT equivalent */ |
| int |
| sshkey_to_certified(struct sshkey *k) |
| { |
| int newtype; |
| |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| newtype = KEY_RSA_CERT; |
| break; |
| case KEY_DSA: |
| newtype = KEY_DSA_CERT; |
| break; |
| case KEY_ECDSA: |
| newtype = KEY_ECDSA_CERT; |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| newtype = KEY_ED25519_CERT; |
| break; |
| default: |
| return SSH_ERR_INVALID_ARGUMENT; |
| } |
| if ((k->cert = cert_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| k->type = newtype; |
| return 0; |
| } |
| |
| /* Convert a certificate to its raw key equivalent */ |
| int |
| sshkey_drop_cert(struct sshkey *k) |
| { |
| if (!sshkey_type_is_cert(k->type)) |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| cert_free(k->cert); |
| k->cert = NULL; |
| k->type = sshkey_type_plain(k->type); |
| return 0; |
| } |
| |
| /* Sign a certified key, (re-)generating the signed certblob. */ |
| int |
| sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg) |
| { |
| struct sshbuf *principals = NULL; |
| u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32]; |
| size_t i, ca_len, sig_len; |
| int ret = SSH_ERR_INTERNAL_ERROR; |
| struct sshbuf *cert; |
| |
| if (k == NULL || k->cert == NULL || |
| k->cert->certblob == NULL || ca == NULL) |
| return SSH_ERR_INVALID_ARGUMENT; |
| if (!sshkey_is_cert(k)) |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| if (!sshkey_type_is_valid_ca(ca->type)) |
| return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| |
| if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0) |
| return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; |
| |
| cert = k->cert->certblob; /* for readability */ |
| sshbuf_reset(cert); |
| if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0) |
| goto out; |
| |
| /* -v01 certs put nonce first */ |
| arc4random_buf(&nonce, sizeof(nonce)); |
| if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0) |
| goto out; |
| |
| /* XXX this substantially duplicates to_blob(); refactor */ |
| switch (k->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA_CERT: |
| if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0) |
| goto out; |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA_CERT: |
| if ((ret = sshbuf_put_cstring(cert, |
| sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 || |
| (ret = sshbuf_put_ec(cert, |
| EC_KEY_get0_public_key(k->ecdsa), |
| EC_KEY_get0_group(k->ecdsa))) != 0) |
| goto out; |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA_CERT: |
| if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 || |
| (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0) |
| goto out; |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519_CERT: |
| if ((ret = sshbuf_put_string(cert, |
| k->ed25519_pk, ED25519_PK_SZ)) != 0) |
| goto out; |
| break; |
| default: |
| ret = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| |
| if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 || |
| (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 || |
| (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0) |
| goto out; |
| |
| if ((principals = sshbuf_new()) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| for (i = 0; i < k->cert->nprincipals; i++) { |
| if ((ret = sshbuf_put_cstring(principals, |
| k->cert->principals[i])) != 0) |
| goto out; |
| } |
| if ((ret = sshbuf_put_stringb(cert, principals)) != 0 || |
| (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 || |
| (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 || |
| (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 || |
| (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 || |
| (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */ |
| (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0) |
| goto out; |
| |
| /* Sign the whole mess */ |
| if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert), |
| sshbuf_len(cert), alg, 0)) != 0) |
| goto out; |
| |
| /* Append signature and we are done */ |
| if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0) |
| goto out; |
| ret = 0; |
| out: |
| if (ret != 0) |
| sshbuf_reset(cert); |
| free(sig_blob); |
| free(ca_blob); |
| sshbuf_free(principals); |
| return ret; |
| } |
| |
| int |
| sshkey_cert_check_authority(const struct sshkey *k, |
| int want_host, int require_principal, |
| const char *name, const char **reason) |
| { |
| u_int i, principal_matches; |
| time_t now = time(NULL); |
| |
| if (reason != NULL) |
| *reason = NULL; |
| |
| if (want_host) { |
| if (k->cert->type != SSH2_CERT_TYPE_HOST) { |
| *reason = "Certificate invalid: not a host certificate"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } else { |
| if (k->cert->type != SSH2_CERT_TYPE_USER) { |
| *reason = "Certificate invalid: not a user certificate"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } |
| if (now < 0) { |
| /* yikes - system clock before epoch! */ |
| *reason = "Certificate invalid: not yet valid"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| if ((u_int64_t)now < k->cert->valid_after) { |
| *reason = "Certificate invalid: not yet valid"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| if ((u_int64_t)now >= k->cert->valid_before) { |
| *reason = "Certificate invalid: expired"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| if (k->cert->nprincipals == 0) { |
| if (require_principal) { |
| *reason = "Certificate lacks principal list"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } else if (name != NULL) { |
| principal_matches = 0; |
| for (i = 0; i < k->cert->nprincipals; i++) { |
| if (strcmp(name, k->cert->principals[i]) == 0) { |
| principal_matches = 1; |
| break; |
| } |
| } |
| if (!principal_matches) { |
| *reason = "Certificate invalid: name is not a listed " |
| "principal"; |
| return SSH_ERR_KEY_CERT_INVALID; |
| } |
| } |
| return 0; |
| } |
| |
| size_t |
| sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l) |
| { |
| char from[32], to[32], ret[64]; |
| time_t tt; |
| struct tm *tm; |
| |
| *from = *to = '\0'; |
| if (cert->valid_after == 0 && |
| cert->valid_before == 0xffffffffffffffffULL) |
| return strlcpy(s, "forever", l); |
| |
| if (cert->valid_after != 0) { |
| /* XXX revisit INT_MAX in 2038 :) */ |
| tt = cert->valid_after > INT_MAX ? |
| INT_MAX : cert->valid_after; |
| tm = localtime(&tt); |
| strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); |
| } |
| if (cert->valid_before != 0xffffffffffffffffULL) { |
| /* XXX revisit INT_MAX in 2038 :) */ |
| tt = cert->valid_before > INT_MAX ? |
| INT_MAX : cert->valid_before; |
| tm = localtime(&tt); |
| strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); |
| } |
| |
| if (cert->valid_after == 0) |
| snprintf(ret, sizeof(ret), "before %s", to); |
| else if (cert->valid_before == 0xffffffffffffffffULL) |
| snprintf(ret, sizeof(ret), "after %s", from); |
| else |
| snprintf(ret, sizeof(ret), "from %s to %s", from, to); |
| |
| return strlcpy(s, ret, l); |
| } |
| |
| int |
| sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| |
| if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0) |
| goto out; |
| switch (key->type) { |
| #ifdef WITH_OPENSSL |
| case KEY_RSA: |
| if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0) |
| goto out; |
| break; |
| case KEY_RSA_CERT: |
| if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0) |
| goto out; |
| break; |
| case KEY_DSA: |
| if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0) |
| goto out; |
| break; |
| case KEY_DSA_CERT: |
| if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0) |
| goto out; |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if ((r = sshbuf_put_cstring(b, |
| sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || |
| (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 || |
| (r = sshbuf_put_bignum2(b, |
| EC_KEY_get0_private_key(key->ecdsa))) != 0) |
| goto out; |
| break; |
| case KEY_ECDSA_CERT: |
| if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| (r = sshbuf_put_bignum2(b, |
| EC_KEY_get0_private_key(key->ecdsa))) != 0) |
| goto out; |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| if ((r = sshbuf_put_string(b, key->ed25519_pk, |
| ED25519_PK_SZ)) != 0 || |
| (r = sshbuf_put_string(b, key->ed25519_sk, |
| ED25519_SK_SZ)) != 0) |
| goto out; |
| break; |
| case KEY_ED25519_CERT: |
| if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || |
| (r = sshbuf_put_string(b, key->ed25519_pk, |
| ED25519_PK_SZ)) != 0 || |
| (r = sshbuf_put_string(b, key->ed25519_sk, |
| ED25519_SK_SZ)) != 0) |
| goto out; |
| break; |
| default: |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| /* success */ |
| r = 0; |
| out: |
| return r; |
| } |
| |
| int |
| sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp) |
| { |
| char *tname = NULL, *curve = NULL; |
| struct sshkey *k = NULL; |
| size_t pklen = 0, sklen = 0; |
| int type, r = SSH_ERR_INTERNAL_ERROR; |
| u_char *ed25519_pk = NULL, *ed25519_sk = NULL; |
| #ifdef WITH_OPENSSL |
| BIGNUM *exponent = NULL; |
| #endif /* WITH_OPENSSL */ |
| |
| if (kp != NULL) |
| *kp = NULL; |
| if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0) |
| goto out; |
| type = sshkey_type_from_name(tname); |
| switch (type) { |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| if ((k = sshkey_new_private(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0) |
| goto out; |
| break; |
| case KEY_DSA_CERT: |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = sshkey_add_private(k)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0) |
| goto out; |
| break; |
| # ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| if ((k = sshkey_new_private(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0) |
| goto out; |
| if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { |
| r = SSH_ERR_EC_CURVE_MISMATCH; |
| goto out; |
| } |
| k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); |
| if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 || |
| (r = sshbuf_get_bignum2(buf, exponent))) |
| goto out; |
| if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), |
| EC_KEY_get0_public_key(k->ecdsa))) != 0 || |
| (r = sshkey_ec_validate_private(k->ecdsa)) != 0) |
| goto out; |
| break; |
| case KEY_ECDSA_CERT: |
| if ((exponent = BN_new()) == NULL) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = sshkey_add_private(k)) != 0 || |
| (r = sshbuf_get_bignum2(buf, exponent)) != 0) |
| goto out; |
| if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), |
| EC_KEY_get0_public_key(k->ecdsa))) != 0 || |
| (r = sshkey_ec_validate_private(k->ecdsa)) != 0) |
| goto out; |
| break; |
| # endif /* OPENSSL_HAS_ECC */ |
| case KEY_RSA: |
| if ((k = sshkey_new_private(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 || |
| (r = rsa_generate_additional_parameters(k->rsa)) != 0) |
| goto out; |
| break; |
| case KEY_RSA_CERT: |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = sshkey_add_private(k)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 || |
| (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 || |
| (r = rsa_generate_additional_parameters(k->rsa)) != 0) |
| goto out; |
| break; |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| if ((k = sshkey_new_private(type)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || |
| (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) |
| goto out; |
| if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| k->ed25519_pk = ed25519_pk; |
| k->ed25519_sk = ed25519_sk; |
| ed25519_pk = ed25519_sk = NULL; |
| break; |
| case KEY_ED25519_CERT: |
| if ((r = sshkey_froms(buf, &k)) != 0 || |
| (r = sshkey_add_private(k)) != 0 || |
| (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || |
| (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) |
| goto out; |
| if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| k->ed25519_pk = ed25519_pk; |
| k->ed25519_sk = ed25519_sk; |
| ed25519_pk = ed25519_sk = NULL; |
| break; |
| default: |
| r = SSH_ERR_KEY_TYPE_UNKNOWN; |
| goto out; |
| } |
| #ifdef WITH_OPENSSL |
| /* enable blinding */ |
| switch (k->type) { |
| case KEY_RSA: |
| case KEY_RSA_CERT: |
| case KEY_RSA1: |
| if (RSA_blinding_on(k->rsa, NULL) != 1) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| break; |
| } |
| #endif /* WITH_OPENSSL */ |
| /* success */ |
| r = 0; |
| if (kp != NULL) { |
| *kp = k; |
| k = NULL; |
| } |
| out: |
| free(tname); |
| free(curve); |
| #ifdef WITH_OPENSSL |
| if (exponent != NULL) |
| BN_clear_free(exponent); |
| #endif /* WITH_OPENSSL */ |
| sshkey_free(k); |
| if (ed25519_pk != NULL) { |
| explicit_bzero(ed25519_pk, pklen); |
| free(ed25519_pk); |
| } |
| if (ed25519_sk != NULL) { |
| explicit_bzero(ed25519_sk, sklen); |
| free(ed25519_sk); |
| } |
| return r; |
| } |
| |
| #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) |
| int |
| sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public) |
| { |
| BN_CTX *bnctx; |
| EC_POINT *nq = NULL; |
| BIGNUM *order, *x, *y, *tmp; |
| int ret = SSH_ERR_KEY_INVALID_EC_VALUE; |
| |
| if ((bnctx = BN_CTX_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| BN_CTX_start(bnctx); |
| |
| /* |
| * We shouldn't ever hit this case because bignum_get_ecpoint() |
| * refuses to load GF2m points. |
| */ |
| if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| NID_X9_62_prime_field) |
| goto out; |
| |
| /* Q != infinity */ |
| if (EC_POINT_is_at_infinity(group, public)) |
| goto out; |
| |
| if ((x = BN_CTX_get(bnctx)) == NULL || |
| (y = BN_CTX_get(bnctx)) == NULL || |
| (order = BN_CTX_get(bnctx)) == NULL || |
| (tmp = BN_CTX_get(bnctx)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */ |
| if (EC_GROUP_get_order(group, order, bnctx) != 1 || |
| EC_POINT_get_affine_coordinates_GFp(group, public, |
| x, y, bnctx) != 1) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (BN_num_bits(x) <= BN_num_bits(order) / 2 || |
| BN_num_bits(y) <= BN_num_bits(order) / 2) |
| goto out; |
| |
| /* nQ == infinity (n == order of subgroup) */ |
| if ((nq = EC_POINT_new(group)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (EC_POINT_is_at_infinity(group, nq) != 1) |
| goto out; |
| |
| /* x < order - 1, y < order - 1 */ |
| if (!BN_sub(tmp, order, BN_value_one())) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0) |
| goto out; |
| ret = 0; |
| out: |
| BN_CTX_free(bnctx); |
| if (nq != NULL) |
| EC_POINT_free(nq); |
| return ret; |
| } |
| |
| int |
| sshkey_ec_validate_private(const EC_KEY *key) |
| { |
| BN_CTX *bnctx; |
| BIGNUM *order, *tmp; |
| int ret = SSH_ERR_KEY_INVALID_EC_VALUE; |
| |
| if ((bnctx = BN_CTX_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| BN_CTX_start(bnctx); |
| |
| if ((order = BN_CTX_get(bnctx)) == NULL || |
| (tmp = BN_CTX_get(bnctx)) == NULL) { |
| ret = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| /* log2(private) > log2(order)/2 */ |
| if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (BN_num_bits(EC_KEY_get0_private_key(key)) <= |
| BN_num_bits(order) / 2) |
| goto out; |
| |
| /* private < order - 1 */ |
| if (!BN_sub(tmp, order, BN_value_one())) { |
| ret = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) |
| goto out; |
| ret = 0; |
| out: |
| BN_CTX_free(bnctx); |
| return ret; |
| } |
| |
| void |
| sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point) |
| { |
| BIGNUM *x, *y; |
| BN_CTX *bnctx; |
| |
| if (point == NULL) { |
| fputs("point=(NULL)\n", stderr); |
| return; |
| } |
| if ((bnctx = BN_CTX_new()) == NULL) { |
| fprintf(stderr, "%s: BN_CTX_new failed\n", __func__); |
| return; |
| } |
| BN_CTX_start(bnctx); |
| if ((x = BN_CTX_get(bnctx)) == NULL || |
| (y = BN_CTX_get(bnctx)) == NULL) { |
| fprintf(stderr, "%s: BN_CTX_get failed\n", __func__); |
| return; |
| } |
| if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| NID_X9_62_prime_field) { |
| fprintf(stderr, "%s: group is not a prime field\n", __func__); |
| return; |
| } |
| if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y, |
| bnctx) != 1) { |
| fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n", |
| __func__); |
| return; |
| } |
| fputs("x=", stderr); |
| BN_print_fp(stderr, x); |
| fputs("\ny=", stderr); |
| BN_print_fp(stderr, y); |
| fputs("\n", stderr); |
| BN_CTX_free(bnctx); |
| } |
| |
| void |
| sshkey_dump_ec_key(const EC_KEY *key) |
| { |
| const BIGNUM *exponent; |
| |
| sshkey_dump_ec_point(EC_KEY_get0_group(key), |
| EC_KEY_get0_public_key(key)); |
| fputs("exponent=", stderr); |
| if ((exponent = EC_KEY_get0_private_key(key)) == NULL) |
| fputs("(NULL)", stderr); |
| else |
| BN_print_fp(stderr, EC_KEY_get0_private_key(key)); |
| fputs("\n", stderr); |
| } |
| #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ |
| |
| static int |
| sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob, |
| const char *passphrase, const char *comment, const char *ciphername, |
| int rounds) |
| { |
| u_char *cp, *key = NULL, *pubkeyblob = NULL; |
| u_char salt[SALT_LEN]; |
| char *b64 = NULL; |
| size_t i, pubkeylen, keylen, ivlen, blocksize, authlen; |
| u_int check; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| struct sshcipher_ctx *ciphercontext = NULL; |
| const struct sshcipher *cipher; |
| const char *kdfname = KDFNAME; |
| struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL; |
| |
| if (rounds <= 0) |
| rounds = DEFAULT_ROUNDS; |
| if (passphrase == NULL || !strlen(passphrase)) { |
| ciphername = "none"; |
| kdfname = "none"; |
| } else if (ciphername == NULL) |
| ciphername = DEFAULT_CIPHERNAME; |
| else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((cipher = cipher_by_name(ciphername)) == NULL) { |
| r = SSH_ERR_INTERNAL_ERROR; |
| goto out; |
| } |
| |
| if ((kdf = sshbuf_new()) == NULL || |
| (encoded = sshbuf_new()) == NULL || |
| (encrypted = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| blocksize = cipher_blocksize(cipher); |
| keylen = cipher_keylen(cipher); |
| ivlen = cipher_ivlen(cipher); |
| authlen = cipher_authlen(cipher); |
| if ((key = calloc(1, keylen + ivlen)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (strcmp(kdfname, "bcrypt") == 0) { |
| arc4random_buf(salt, SALT_LEN); |
| if (bcrypt_pbkdf(passphrase, strlen(passphrase), |
| salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) { |
| r = SSH_ERR_INVALID_ARGUMENT; |
| goto out; |
| } |
| if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 || |
| (r = sshbuf_put_u32(kdf, rounds)) != 0) |
| goto out; |
| } else if (strcmp(kdfname, "none") != 0) { |
| /* Unsupported KDF type */ |
| r = SSH_ERR_KEY_UNKNOWN_CIPHER; |
| goto out; |
| } |
| if ((r = cipher_init(&ciphercontext, cipher, key, keylen, |
| key + keylen, ivlen, 1)) != 0) |
| goto out; |
| |
| if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 || |
| (r = sshbuf_put_cstring(encoded, ciphername)) != 0 || |
| (r = sshbuf_put_cstring(encoded, kdfname)) != 0 || |
| (r = sshbuf_put_stringb(encoded, kdf)) != 0 || |
| (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */ |
| (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 || |
| (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0) |
| goto out; |
| |
| /* set up the buffer that will be encrypted */ |
| |
| /* Random check bytes */ |
| check = arc4random(); |
| if ((r = sshbuf_put_u32(encrypted, check)) != 0 || |
| (r = sshbuf_put_u32(encrypted, check)) != 0) |
| goto out; |
| |
| /* append private key and comment*/ |
| if ((r = sshkey_private_serialize(prv, encrypted)) != 0 || |
| (r = sshbuf_put_cstring(encrypted, comment)) != 0) |
| goto out; |
| |
| /* padding */ |
| i = 0; |
| while (sshbuf_len(encrypted) % blocksize) { |
| if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0) |
| goto out; |
| } |
| |
| /* length in destination buffer */ |
| if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0) |
| goto out; |
| |
| /* encrypt */ |
| if ((r = sshbuf_reserve(encoded, |
| sshbuf_len(encrypted) + authlen, &cp)) != 0) |
| goto out; |
| if ((r = cipher_crypt(ciphercontext, 0, cp, |
| sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0) |
| goto out; |
| |
| /* uuencode */ |
| if ((b64 = sshbuf_dtob64(encoded)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| sshbuf_reset(blob); |
| if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0) |
| goto out; |
| for (i = 0; i < strlen(b64); i++) { |
| if ((r = sshbuf_put_u8(blob, b64[i])) != 0) |
| goto out; |
| /* insert line breaks */ |
| if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0) |
| goto out; |
| } |
| if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0) |
| goto out; |
| if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0) |
| goto out; |
| |
| /* success */ |
| r = 0; |
| |
| out: |
| sshbuf_free(kdf); |
| sshbuf_free(encoded); |
| sshbuf_free(encrypted); |
| cipher_free(ciphercontext); |
| explicit_bzero(salt, sizeof(salt)); |
| if (key != NULL) { |
| explicit_bzero(key, keylen + ivlen); |
| free(key); |
| } |
| if (pubkeyblob != NULL) { |
| explicit_bzero(pubkeyblob, pubkeylen); |
| free(pubkeyblob); |
| } |
| if (b64 != NULL) { |
| explicit_bzero(b64, strlen(b64)); |
| free(b64); |
| } |
| return r; |
| } |
| |
| static int |
| sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase, |
| struct sshkey **keyp, char **commentp) |
| { |
| char *comment = NULL, *ciphername = NULL, *kdfname = NULL; |
| const struct sshcipher *cipher = NULL; |
| const u_char *cp; |
| int r = SSH_ERR_INTERNAL_ERROR; |
| size_t encoded_len; |
| size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0; |
| struct sshbuf *encoded = NULL, *decoded = NULL; |
| struct sshbuf *kdf = NULL, *decrypted = NULL; |
| struct sshcipher_ctx *ciphercontext = NULL; |
| struct sshkey *k = NULL; |
| u_char *key = NULL, *salt = NULL, *dp, pad, last; |
| u_int blocksize, rounds, nkeys, encrypted_len, check1, check2; |
| |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| if ((encoded = sshbuf_new()) == NULL || |
| (decoded = sshbuf_new()) == NULL || |
| (decrypted = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| /* check preamble */ |
| cp = sshbuf_ptr(blob); |
| encoded_len = sshbuf_len(blob); |
| if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) || |
| memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| cp += MARK_BEGIN_LEN; |
| encoded_len -= MARK_BEGIN_LEN; |
| |
| /* Look for end marker, removing whitespace as we go */ |
| while (encoded_len > 0) { |
| if (*cp != '\n' && *cp != '\r') { |
| if ((r = sshbuf_put_u8(encoded, *cp)) != 0) |
| goto out; |
| } |
| last = *cp; |
| encoded_len--; |
| cp++; |
| if (last == '\n') { |
| if (encoded_len >= MARK_END_LEN && |
| memcmp(cp, MARK_END, MARK_END_LEN) == 0) { |
| /* \0 terminate */ |
| if ((r = sshbuf_put_u8(encoded, 0)) != 0) |
| goto out; |
| break; |
| } |
| } |
| } |
| if (encoded_len == 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* decode base64 */ |
| if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0) |
| goto out; |
| |
| /* check magic */ |
| if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) || |
| memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| /* parse public portion of key */ |
| if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 || |
| (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 || |
| (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 || |
| (r = sshbuf_froms(decoded, &kdf)) != 0 || |
| (r = sshbuf_get_u32(decoded, &nkeys)) != 0 || |
| (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */ |
| (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0) |
| goto out; |
| |
| if ((cipher = cipher_by_name(ciphername)) == NULL) { |
| r = SSH_ERR_KEY_UNKNOWN_CIPHER; |
| goto out; |
| } |
| if ((passphrase == NULL || strlen(passphrase) == 0) && |
| strcmp(ciphername, "none") != 0) { |
| /* passphrase required */ |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) { |
| r = SSH_ERR_KEY_UNKNOWN_CIPHER; |
| goto out; |
| } |
| if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| if (nkeys != 1) { |
| /* XXX only one key supported */ |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* check size of encrypted key blob */ |
| blocksize = cipher_blocksize(cipher); |
| if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* setup key */ |
| keylen = cipher_keylen(cipher); |
| ivlen = cipher_ivlen(cipher); |
| authlen = cipher_authlen(cipher); |
| if ((key = calloc(1, keylen + ivlen)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if (strcmp(kdfname, "bcrypt") == 0) { |
| if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 || |
| (r = sshbuf_get_u32(kdf, &rounds)) != 0) |
| goto out; |
| if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen, |
| key, keylen + ivlen, rounds) < 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| |
| /* check that an appropriate amount of auth data is present */ |
| if (sshbuf_len(decoded) < encrypted_len + authlen) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* decrypt private portion of key */ |
| if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 || |
| (r = cipher_init(&ciphercontext, cipher, key, keylen, |
| key + keylen, ivlen, 0)) != 0) |
| goto out; |
| if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded), |
| encrypted_len, 0, authlen)) != 0) { |
| /* an integrity error here indicates an incorrect passphrase */ |
| if (r == SSH_ERR_MAC_INVALID) |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0) |
| goto out; |
| /* there should be no trailing data */ |
| if (sshbuf_len(decoded) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| |
| /* check check bytes */ |
| if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 || |
| (r = sshbuf_get_u32(decrypted, &check2)) != 0) |
| goto out; |
| if (check1 != check2) { |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| |
| /* Load the private key and comment */ |
| if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 || |
| (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0) |
| goto out; |
| |
| /* Check deterministic padding */ |
| i = 0; |
| while (sshbuf_len(decrypted)) { |
| if ((r = sshbuf_get_u8(decrypted, &pad)) != 0) |
| goto out; |
| if (pad != (++i & 0xff)) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| } |
| |
| /* XXX decode pubkey and check against private */ |
| |
| /* success */ |
| r = 0; |
| if (keyp != NULL) { |
| *keyp = k; |
| k = NULL; |
| } |
| if (commentp != NULL) { |
| *commentp = comment; |
| comment = NULL; |
| } |
| out: |
| pad = 0; |
| cipher_free(ciphercontext); |
| free(ciphername); |
| free(kdfname); |
| free(comment); |
| if (salt != NULL) { |
| explicit_bzero(salt, slen); |
| free(salt); |
| } |
| if (key != NULL) { |
| explicit_bzero(key, keylen + ivlen); |
| free(key); |
| } |
| sshbuf_free(encoded); |
| sshbuf_free(decoded); |
| sshbuf_free(kdf); |
| sshbuf_free(decrypted); |
| sshkey_free(k); |
| return r; |
| } |
| |
| #if WITH_SSH1 |
| /* |
| * Serialises the authentication (private) key to a blob, encrypting it with |
| * passphrase. The identification of the blob (lowest 64 bits of n) will |
| * precede the key to provide identification of the key without needing a |
| * passphrase. |
| */ |
| static int |
| sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob, |
| const char *passphrase, const char *comment) |
| { |
| struct sshbuf *buffer = NULL, *encrypted = NULL; |
| u_char buf[8]; |
| int r, cipher_num; |
| struct sshcipher_ctx *ciphercontext = NULL; |
| const struct sshcipher *cipher; |
| u_char *cp; |
| |
| /* |
| * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting |
| * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. |
| */ |
| cipher_num = (strcmp(passphrase, "") == 0) ? |
| SSH_CIPHER_NONE : SSH_CIPHER_3DES; |
| if ((cipher = cipher_by_number(cipher_num)) == NULL) |
| return SSH_ERR_INTERNAL_ERROR; |
| |
| /* This buffer is used to build the secret part of the private key. */ |
| if ((buffer = sshbuf_new()) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| |
| /* Put checkbytes for checking passphrase validity. */ |
| if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0) |
| goto out; |
| arc4random_buf(cp, 2); |
| memcpy(cp + 2, cp, 2); |
| |
| /* |
| * Store the private key (n and e will not be stored because they |
| * will be stored in plain text, and storing them also in encrypted |
| * format would just give known plaintext). |
| * Note: q and p are stored in reverse order to SSL. |
| */ |
| if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 || |
| (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 || |
| (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 || |
| (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0) |
| goto out; |
| |
| /* Pad the part to be encrypted to a size that is a multiple of 8. */ |
| explicit_bzero(buf, 8); |
| if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0) |
| goto out; |
| |
| /* This buffer will be used to contain the data in the file. */ |
| if ((encrypted = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| /* First store keyfile id string. */ |
| if ((r = sshbuf_put(encrypted, LEGACY_BEGIN, |
| sizeof(LEGACY_BEGIN))) != 0) |
| goto out; |
| |
| /* Store cipher type and "reserved" field. */ |
| if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 || |
| (r = sshbuf_put_u32(encrypted, 0)) != 0) |
| goto out; |
| |
| /* Store public key. This will be in plain text. */ |
| if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 || |
| (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 || |
| (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 || |
| (r = sshbuf_put_cstring(encrypted, comment)) != 0) |
| goto out; |
| |
| /* Allocate space for the private part of the key in the buffer. */ |
| if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0) |
| goto out; |
| |
| if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase, |
| CIPHER_ENCRYPT)) != 0) |
| goto out; |
| if ((r = cipher_crypt(ciphercontext, 0, cp, |
| sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0) |
| goto out; |
| |
| r = sshbuf_putb(blob, encrypted); |
| |
| out: |
| cipher_free(ciphercontext); |
| explicit_bzero(buf, sizeof(buf)); |
| sshbuf_free(buffer); |
| sshbuf_free(encrypted); |
| |
| return r; |
| } |
| #endif /* WITH_SSH1 */ |
| |
| #ifdef WITH_OPENSSL |
| /* convert SSH v2 key in OpenSSL PEM format */ |
| static int |
| sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob, |
| const char *_passphrase, const char *comment) |
| { |
| int success, r; |
| int blen, len = strlen(_passphrase); |
| u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
| #if (OPENSSL_VERSION_NUMBER < 0x00907000L) |
| const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
| #else |
| const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; |
| #endif |
| const u_char *bptr; |
| BIO *bio = NULL; |
| |
| if (len > 0 && len <= 4) |
| return SSH_ERR_PASSPHRASE_TOO_SHORT; |
| if ((bio = BIO_new(BIO_s_mem())) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| |
| switch (key->type) { |
| case KEY_DSA: |
| success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, |
| cipher, passphrase, len, NULL, NULL); |
| break; |
| #ifdef OPENSSL_HAS_ECC |
| case KEY_ECDSA: |
| success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, |
| cipher, passphrase, len, NULL, NULL); |
| break; |
| #endif |
| case KEY_RSA: |
| success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, |
| cipher, passphrase, len, NULL, NULL); |
| break; |
| default: |
| success = 0; |
| break; |
| } |
| if (success == 0) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) { |
| r = SSH_ERR_INTERNAL_ERROR; |
| goto out; |
| } |
| if ((r = sshbuf_put(blob, bptr, blen)) != 0) |
| goto out; |
| r = 0; |
| out: |
| BIO_free(bio); |
| return r; |
| } |
| #endif /* WITH_OPENSSL */ |
| |
| /* Serialise "key" to buffer "blob" */ |
| int |
| sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob, |
| const char *passphrase, const char *comment, |
| int force_new_format, const char *new_format_cipher, int new_format_rounds) |
| { |
| switch (key->type) { |
| #ifdef WITH_SSH1 |
| case KEY_RSA1: |
| return sshkey_private_rsa1_to_blob(key, blob, |
| passphrase, comment); |
| #endif /* WITH_SSH1 */ |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_RSA: |
| if (force_new_format) { |
| return sshkey_private_to_blob2(key, blob, passphrase, |
| comment, new_format_cipher, new_format_rounds); |
| } |
| return sshkey_private_pem_to_blob(key, blob, |
| passphrase, comment); |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| return sshkey_private_to_blob2(key, blob, passphrase, |
| comment, new_format_cipher, new_format_rounds); |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| } |
| |
| #ifdef WITH_SSH1 |
| /* |
| * Parse the public, unencrypted portion of a RSA1 key. |
| */ |
| int |
| sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob, |
| struct sshkey **keyp, char **commentp) |
| { |
| int r; |
| struct sshkey *pub = NULL; |
| struct sshbuf *copy = NULL; |
| |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| /* Check that it is at least big enough to contain the ID string. */ |
| if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN)) |
| return SSH_ERR_INVALID_FORMAT; |
| |
| /* |
| * Make sure it begins with the id string. Consume the id string |
| * from the buffer. |
| */ |
| if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0) |
| return SSH_ERR_INVALID_FORMAT; |
| /* Make a working copy of the keyblob and skip past the magic */ |
| if ((copy = sshbuf_fromb(blob)) == NULL) |
| return SSH_ERR_ALLOC_FAIL; |
| if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0) |
| goto out; |
| |
| /* Skip cipher type, reserved data and key bits. */ |
| if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */ |
| (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */ |
| (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */ |
| goto out; |
| |
| /* Read the public key from the buffer. */ |
| if ((pub = sshkey_new(KEY_RSA1)) == NULL || |
| (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 || |
| (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0) |
| goto out; |
| |
| /* Finally, the comment */ |
| if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0) |
| goto out; |
| |
| /* The encrypted private part is not parsed by this function. */ |
| |
| r = 0; |
| if (keyp != NULL) { |
| *keyp = pub; |
| pub = NULL; |
| } |
| out: |
| sshbuf_free(copy); |
| sshkey_free(pub); |
| return r; |
| } |
| |
| static int |
| sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase, |
| struct sshkey **keyp, char **commentp) |
| { |
| int r; |
| u_int16_t check1, check2; |
| u_int8_t cipher_type; |
| struct sshbuf *decrypted = NULL, *copy = NULL; |
| u_char *cp; |
| char *comment = NULL; |
| struct sshcipher_ctx *ciphercontext = NULL; |
| const struct sshcipher *cipher; |
| struct sshkey *prv = NULL; |
| |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| /* Check that it is at least big enough to contain the ID string. */ |
| if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN)) |
| return SSH_ERR_INVALID_FORMAT; |
| |
| /* |
| * Make sure it begins with the id string. Consume the id string |
| * from the buffer. |
| */ |
| if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0) |
| return SSH_ERR_INVALID_FORMAT; |
| |
| if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((copy = sshbuf_fromb(blob)) == NULL || |
| (decrypted = sshbuf_new()) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0) |
| goto out; |
| |
| /* Read cipher type. */ |
| if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 || |
| (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */ |
| goto out; |
| |
| /* Read the public key and comment from the buffer. */ |
| if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */ |
| (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 || |
| (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 || |
| (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0) |
| goto out; |
| |
| /* Check that it is a supported cipher. */ |
| cipher = cipher_by_number(cipher_type); |
| if (cipher == NULL) { |
| r = SSH_ERR_KEY_UNKNOWN_CIPHER; |
| goto out; |
| } |
| /* Initialize space for decrypted data. */ |
| if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0) |
| goto out; |
| |
| /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ |
| if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase, |
| CIPHER_DECRYPT)) != 0) |
| goto out; |
| if ((r = cipher_crypt(ciphercontext, 0, cp, |
| sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) |
| goto out; |
| |
| if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 || |
| (r = sshbuf_get_u16(decrypted, &check2)) != 0) |
| goto out; |
| if (check1 != check2) { |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| |
| /* Read the rest of the private key. */ |
| if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 || |
| (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 || |
| (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 || |
| (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0) |
| goto out; |
| |
| /* calculate p-1 and q-1 */ |
| if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0) |
| goto out; |
| |
| /* enable blinding */ |
| if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| r = 0; |
| if (keyp != NULL) { |
| *keyp = prv; |
| prv = NULL; |
| } |
| if (commentp != NULL) { |
| *commentp = comment; |
| comment = NULL; |
| } |
| out: |
| cipher_free(ciphercontext); |
| free(comment); |
| sshkey_free(prv); |
| sshbuf_free(copy); |
| sshbuf_free(decrypted); |
| return r; |
| } |
| #endif /* WITH_SSH1 */ |
| |
| #ifdef WITH_OPENSSL |
| static int |
| sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type, |
| const char *passphrase, struct sshkey **keyp) |
| { |
| EVP_PKEY *pk = NULL; |
| struct sshkey *prv = NULL; |
| BIO *bio = NULL; |
| int r; |
| |
| if (keyp != NULL) |
| *keyp = NULL; |
| |
| if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX) |
| return SSH_ERR_ALLOC_FAIL; |
| if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) != |
| (int)sshbuf_len(blob)) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| |
| if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, |
| (char *)passphrase)) == NULL) { |
| r = SSH_ERR_KEY_WRONG_PASSPHRASE; |
| goto out; |
| } |
| if (pk->type == EVP_PKEY_RSA && |
| (type == KEY_UNSPEC || type == KEY_RSA)) { |
| if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| prv->rsa = EVP_PKEY_get1_RSA(pk); |
| prv->type = KEY_RSA; |
| #ifdef DEBUG_PK |
| RSA_print_fp(stderr, prv->rsa, 8); |
| #endif |
| if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
| r = SSH_ERR_LIBCRYPTO_ERROR; |
| goto out; |
| } |
| } else if (pk->type == EVP_PKEY_DSA && |
| (type == KEY_UNSPEC || type == KEY_DSA)) { |
| if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| prv->dsa = EVP_PKEY_get1_DSA(pk); |
| prv->type = KEY_DSA; |
| #ifdef DEBUG_PK |
| DSA_print_fp(stderr, prv->dsa, 8); |
| #endif |
| #ifdef OPENSSL_HAS_ECC |
| } else if (pk->type == EVP_PKEY_EC && |
| (type == KEY_UNSPEC || type == KEY_ECDSA)) { |
| if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { |
| r = SSH_ERR_ALLOC_FAIL; |
| goto out; |
| } |
| prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); |
| prv->type = KEY_ECDSA; |
| prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa); |
| if (prv->ecdsa_nid == -1 || |
| sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL || |
| sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), |
| EC_KEY_get0_public_key(prv->ecdsa)) != 0 || |
| sshkey_ec_validate_private(prv->ecdsa) != 0) { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| # ifdef DEBUG_PK |
| if (prv != NULL && prv->ecdsa != NULL) |
| sshkey_dump_ec_key(prv->ecdsa); |
| # endif |
| #endif /* OPENSSL_HAS_ECC */ |
| } else { |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| r = 0; |
| if (keyp != NULL) { |
| *keyp = prv; |
| prv = NULL; |
| } |
| out: |
| BIO_free(bio); |
| if (pk != NULL) |
| EVP_PKEY_free(pk); |
| sshkey_free(prv); |
| return r; |
| } |
| #endif /* WITH_OPENSSL */ |
| |
| int |
| sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type, |
| const char *passphrase, struct sshkey **keyp, char **commentp) |
| { |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| switch (type) { |
| #ifdef WITH_SSH1 |
| case KEY_RSA1: |
| return sshkey_parse_private_rsa1(blob, passphrase, |
| keyp, commentp); |
| #endif /* WITH_SSH1 */ |
| #ifdef WITH_OPENSSL |
| case KEY_DSA: |
| case KEY_ECDSA: |
| case KEY_RSA: |
| return sshkey_parse_private_pem_fileblob(blob, type, |
| passphrase, keyp); |
| #endif /* WITH_OPENSSL */ |
| case KEY_ED25519: |
| return sshkey_parse_private2(blob, type, passphrase, |
| keyp, commentp); |
| case KEY_UNSPEC: |
| if (sshkey_parse_private2(blob, type, passphrase, keyp, |
| commentp) == 0) |
| return 0; |
| #ifdef WITH_OPENSSL |
| return sshkey_parse_private_pem_fileblob(blob, type, |
| passphrase, keyp); |
| #else |
| return SSH_ERR_INVALID_FORMAT; |
| #endif /* WITH_OPENSSL */ |
| default: |
| return SSH_ERR_KEY_TYPE_UNKNOWN; |
| } |
| } |
| |
| int |
| sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase, |
| struct sshkey **keyp, char **commentp) |
| { |
| if (keyp != NULL) |
| *keyp = NULL; |
| if (commentp != NULL) |
| *commentp = NULL; |
| |
| #ifdef WITH_SSH1 |
| /* it's a SSH v1 key if the public key part is readable */ |
| if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) { |
| return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1, |
| passphrase, keyp, commentp); |
| } |
| #endif /* WITH_SSH1 */ |
| return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC, |
| passphrase, keyp, commentp); |
| } |