| /* $OpenBSD: kex.h,v 1.89 2018/07/09 21:56:06 markus Exp $ */ |
| |
| /* |
| * Copyright (c) 2000, 2001 Markus Friedl. 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. |
| */ |
| #ifndef KEX_H |
| #define KEX_H |
| |
| #include "mac.h" |
| #include "key.h" /* XXX for typedef */ |
| |
| #ifdef WITH_LEAKMALLOC |
| #include "leakmalloc.h" |
| #endif |
| |
| #ifdef WITH_OPENSSL |
| # ifdef OPENSSL_HAS_ECC |
| # include <openssl/ec.h> |
| # else /* OPENSSL_HAS_ECC */ |
| # define EC_KEY void |
| # define EC_GROUP void |
| # define EC_POINT void |
| # endif /* OPENSSL_HAS_ECC */ |
| #else /* WITH_OPENSSL */ |
| # define EC_KEY void |
| # define EC_GROUP void |
| # define EC_POINT void |
| #endif /* WITH_OPENSSL */ |
| |
| #define KEX_COOKIE_LEN 16 |
| |
| #define KEX_DH1 "diffie-hellman-group1-sha1" |
| #define KEX_DH14_SHA1 "diffie-hellman-group14-sha1" |
| #define KEX_DH14_SHA256 "diffie-hellman-group14-sha256" |
| #define KEX_DH16_SHA512 "diffie-hellman-group16-sha512" |
| #define KEX_DH18_SHA512 "diffie-hellman-group18-sha512" |
| #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" |
| #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" |
| #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256" |
| #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384" |
| #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521" |
| #define KEX_CURVE25519_SHA256 "curve25519-sha256" |
| #define KEX_CURVE25519_SHA256_OLD "curve25519-sha256@libssh.org" |
| |
| #define COMP_NONE 0 |
| #define COMP_ZLIB 1 |
| #define COMP_DELAYED 2 |
| |
| #define CURVE25519_SIZE 32 |
| |
| enum kex_init_proposals { |
| PROPOSAL_KEX_ALGS, |
| PROPOSAL_SERVER_HOST_KEY_ALGS, |
| PROPOSAL_ENC_ALGS_CTOS, |
| PROPOSAL_ENC_ALGS_STOC, |
| PROPOSAL_MAC_ALGS_CTOS, |
| PROPOSAL_MAC_ALGS_STOC, |
| PROPOSAL_COMP_ALGS_CTOS, |
| PROPOSAL_COMP_ALGS_STOC, |
| PROPOSAL_LANG_CTOS, |
| PROPOSAL_LANG_STOC, |
| PROPOSAL_MAX |
| }; |
| |
| enum kex_modes { |
| MODE_IN, |
| MODE_OUT, |
| MODE_MAX |
| }; |
| |
| enum kex_exchange { |
| KEX_DH_GRP1_SHA1, |
| KEX_DH_GRP14_SHA1, |
| KEX_DH_GRP14_SHA256, |
| KEX_DH_GRP16_SHA512, |
| KEX_DH_GRP18_SHA512, |
| KEX_DH_GEX_SHA1, |
| KEX_DH_GEX_SHA256, |
| KEX_ECDH_SHA2, |
| KEX_C25519_SHA256, |
| KEX_MAX |
| }; |
| |
| #define KEX_INIT_SENT 0x0001 |
| |
| struct sshenc { |
| char *name; |
| const struct sshcipher *cipher; |
| int enabled; |
| u_int key_len; |
| u_int iv_len; |
| u_int block_size; |
| u_char *key; |
| u_char *iv; |
| }; |
| struct sshcomp { |
| u_int type; |
| int enabled; |
| char *name; |
| }; |
| struct newkeys { |
| struct sshenc enc; |
| struct sshmac mac; |
| struct sshcomp comp; |
| }; |
| |
| struct ssh; |
| |
| struct kex { |
| u_char *session_id; |
| size_t session_id_len; |
| struct newkeys *newkeys[MODE_MAX]; |
| u_int we_need; |
| u_int dh_need; |
| int server; |
| char *name; |
| char *hostkey_alg; |
| int hostkey_type; |
| int hostkey_nid; |
| u_int kex_type; |
| char *server_sig_algs; |
| int ext_info_c; |
| struct sshbuf *my; |
| struct sshbuf *peer; |
| sig_atomic_t done; |
| u_int flags; |
| int hash_alg; |
| int ec_nid; |
| char *client_version_string; |
| char *server_version_string; |
| char *failed_choice; |
| int (*verify_host_key)(struct sshkey *, struct ssh *); |
| struct sshkey *(*load_host_public_key)(int, int, struct ssh *); |
| struct sshkey *(*load_host_private_key)(int, int, struct ssh *); |
| int (*host_key_index)(struct sshkey *, int, struct ssh *); |
| int (*sign)(struct sshkey *, struct sshkey *, u_char **, size_t *, |
| const u_char *, size_t, const char *, u_int); |
| int (*kex[KEX_MAX])(struct ssh *); |
| /* kex specific state */ |
| DH *dh; /* DH */ |
| u_int min, max, nbits; /* GEX */ |
| EC_KEY *ec_client_key; /* ECDH */ |
| const EC_GROUP *ec_group; /* ECDH */ |
| u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 */ |
| u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */ |
| }; |
| |
| int kex_names_valid(const char *); |
| char *kex_alg_list(char); |
| char *kex_names_cat(const char *, const char *); |
| int kex_assemble_names(char **, const char *, const char *); |
| |
| int kex_new(struct ssh *, char *[PROPOSAL_MAX], struct kex **); |
| int kex_setup(struct ssh *, char *[PROPOSAL_MAX]); |
| void kex_free_newkeys(struct newkeys *); |
| void kex_free(struct kex *); |
| |
| int kex_buf2prop(struct sshbuf *, int *, char ***); |
| int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]); |
| void kex_prop_free(char **); |
| |
| int kex_send_kexinit(struct ssh *); |
| int kex_input_kexinit(int, u_int32_t, struct ssh *); |
| int kex_input_ext_info(int, u_int32_t, struct ssh *); |
| int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *); |
| int kex_derive_keys_bn(struct ssh *, u_char *, u_int, const BIGNUM *); |
| int kex_send_newkeys(struct ssh *); |
| int kex_start_rekex(struct ssh *); |
| |
| int kexdh_client(struct ssh *); |
| int kexdh_server(struct ssh *); |
| int kexgex_client(struct ssh *); |
| int kexgex_server(struct ssh *); |
| int kexecdh_client(struct ssh *); |
| int kexecdh_server(struct ssh *); |
| int kexc25519_client(struct ssh *); |
| int kexc25519_server(struct ssh *); |
| |
| int kex_dh_hash(int, const char *, const char *, |
| const u_char *, size_t, const u_char *, size_t, const u_char *, size_t, |
| const BIGNUM *, const BIGNUM *, const BIGNUM *, u_char *, size_t *); |
| |
| int kexgex_hash(int, const char *, const char *, |
| const u_char *, size_t, const u_char *, size_t, const u_char *, size_t, |
| int, int, int, |
| const BIGNUM *, const BIGNUM *, const BIGNUM *, |
| const BIGNUM *, const BIGNUM *, |
| u_char *, size_t *); |
| |
| int kex_ecdh_hash(int, const EC_GROUP *, const char *, const char *, |
| const u_char *, size_t, const u_char *, size_t, const u_char *, size_t, |
| const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char *, size_t *); |
| |
| int kex_c25519_hash(int, const char *, const char *, |
| const u_char *, size_t, const u_char *, size_t, |
| const u_char *, size_t, const u_char *, const u_char *, |
| const u_char *, size_t, u_char *, size_t *); |
| |
| void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE]) |
| __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE))) |
| __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE))); |
| int kexc25519_shared_key(const u_char key[CURVE25519_SIZE], |
| const u_char pub[CURVE25519_SIZE], struct sshbuf *out) |
| __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE))) |
| __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE))); |
| |
| #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) |
| void dump_digest(char *, u_char *, int); |
| #endif |
| |
| #if !defined(WITH_OPENSSL) || !defined(OPENSSL_HAS_ECC) |
| # undef EC_KEY |
| # undef EC_GROUP |
| # undef EC_POINT |
| #endif |
| |
| #endif |