/* $OpenBSD: kex.h,v 1.73 2015/07/30 00:01:34 djm 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 #ifdef __cplusplus extern "C" { #endif #include "mac.h" #include "buffer.h" /* XXX for typedef */ #include "key.h" /* XXX for typedef */ #ifdef WITH_LEAKMALLOC #include "leakmalloc.h" #endif #include "opensshlib.h" #ifdef WITH_OPENSSL # ifdef OPENSSL_HAS_ECC # include # 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 "diffie-hellman-group14-sha1" #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" #define KEX_RESUME "resume@appgate.com" #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@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_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; int hostkey_type; int hostkey_nid; u_int kex_type; int roaming; 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 *, ncrack_ssh_state *); struct sshkey *(*load_host_public_key)(int, int, ncrack_ssh_state *); struct sshkey *(*load_host_private_key)(int, int, ncrack_ssh_state *); int (*host_key_index)(struct sshkey *, int, ncrack_ssh_state *); int (*sign)(struct sshkey *, struct sshkey *, u_char **, size_t *, const u_char *, size_t, u_int); int (*kex[KEX_MAX])(ncrack_ssh_state *); /* 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(const char *, char **); int kex_new(ncrack_ssh_state *, char *[PROPOSAL_MAX], struct kex **); int kex_setup(ncrack_ssh_state *, 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(ncrack_ssh_state *); int ncrackssh_kex_input_kexinit(ncrack_ssh_state *); int kex_derive_keys(ncrack_ssh_state *, u_char *, u_int, const struct sshbuf *); int kex_derive_keys_bn(ncrack_ssh_state *, u_char *, u_int, const BIGNUM *); int kex_send_newkeys(ncrack_ssh_state *); int ncrackssh_input_kex_dh_gex_group(ncrack_ssh_state *nstate); int ncrackssh_input_kex_ecdh_reply(ncrack_ssh_state *nstate); int ncrackssh_input_kex_dh_gex_reply(ncrack_ssh_state *nstate); int kexdh_client(ncrack_ssh_state *); int ncrackssh_input_kex_dh(ncrack_ssh_state *nstate); int kexdh_server(struct ssh *); int kexgex_client(ncrack_ssh_state *); int kexgex_server(struct ssh *); int kexecdh_client(ncrack_ssh_state *); int kexecdh_server(struct ssh *); int kexc25519_client(ncrack_ssh_state *); int ncrackssh_input_kex_c25519_reply(ncrack_ssh_state *nstate); int kexc25519_server(struct ssh *); int kex_dh_hash(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 char *, size_t, const 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))); int derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); #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 #ifdef __cplusplus } /* End of 'extern "C"' */ #endif #endif