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91b580e4be
[bufaux.c buffer.h kex.c kex.h kexc25519.c kexc25519c.c kexc25519s.c]
[kexdhc.c kexdhs.c kexecdhc.c kexecdhs.c kexgexc.c kexgexs.c]
avoid use of OpenSSL BIGNUM type and functions for KEX with
Curve25519 by adding a buffer_put_bignum2_from_string() that stores
a string using the bignum encoding rules. Will make it easier to
build a reduced-feature OpenSSH without OpenSSL in the future;
ok markus@
205 lines
5.6 KiB
C
205 lines
5.6 KiB
C
/* $OpenBSD: kex.h,v 1.60 2014/01/12 08:13:13 djm Exp $ */
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/*
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* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef KEX_H
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#define KEX_H
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#include <signal.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#ifdef OPENSSL_HAS_ECC
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#include <openssl/ec.h>
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#endif
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#define KEX_COOKIE_LEN 16
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#define KEX_DH1 "diffie-hellman-group1-sha1"
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#define KEX_DH14 "diffie-hellman-group14-sha1"
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#define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
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#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
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#define KEX_RESUME "resume@appgate.com"
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#define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
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#define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
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#define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
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#define KEX_CURVE25519_SHA256 "curve25519-sha256@libssh.org"
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#define COMP_NONE 0
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#define COMP_ZLIB 1
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#define COMP_DELAYED 2
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enum kex_init_proposals {
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PROPOSAL_KEX_ALGS,
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PROPOSAL_SERVER_HOST_KEY_ALGS,
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PROPOSAL_ENC_ALGS_CTOS,
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PROPOSAL_ENC_ALGS_STOC,
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PROPOSAL_MAC_ALGS_CTOS,
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PROPOSAL_MAC_ALGS_STOC,
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PROPOSAL_COMP_ALGS_CTOS,
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PROPOSAL_COMP_ALGS_STOC,
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PROPOSAL_LANG_CTOS,
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PROPOSAL_LANG_STOC,
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PROPOSAL_MAX
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};
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enum kex_modes {
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MODE_IN,
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MODE_OUT,
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MODE_MAX
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};
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enum kex_exchange {
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KEX_DH_GRP1_SHA1,
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KEX_DH_GRP14_SHA1,
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KEX_DH_GEX_SHA1,
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KEX_DH_GEX_SHA256,
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KEX_ECDH_SHA2,
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KEX_C25519_SHA256,
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KEX_MAX
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};
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#define KEX_INIT_SENT 0x0001
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typedef struct Kex Kex;
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typedef struct Mac Mac;
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typedef struct Comp Comp;
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typedef struct Enc Enc;
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typedef struct Newkeys Newkeys;
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struct Enc {
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char *name;
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const Cipher *cipher;
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int enabled;
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u_int key_len;
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u_int iv_len;
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u_int block_size;
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u_char *key;
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u_char *iv;
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};
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struct Mac {
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char *name;
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int enabled;
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u_int mac_len;
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u_char *key;
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u_int key_len;
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int type;
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int etm; /* Encrypt-then-MAC */
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const EVP_MD *evp_md;
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HMAC_CTX evp_ctx;
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struct umac_ctx *umac_ctx;
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};
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struct Comp {
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int type;
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int enabled;
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char *name;
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};
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struct Newkeys {
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Enc enc;
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Mac mac;
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Comp comp;
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};
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struct Kex {
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u_char *session_id;
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u_int session_id_len;
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Newkeys *newkeys[MODE_MAX];
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u_int we_need;
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int server;
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char *name;
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int hostkey_type;
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int kex_type;
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int roaming;
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Buffer my;
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Buffer peer;
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sig_atomic_t done;
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int flags;
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int hash_alg;
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int ec_nid;
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char *client_version_string;
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char *server_version_string;
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int (*verify_host_key)(Key *);
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Key *(*load_host_public_key)(int);
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Key *(*load_host_private_key)(int);
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int (*host_key_index)(Key *);
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void (*sign)(Key *, Key *, u_char **, u_int *, u_char *, u_int);
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void (*kex[KEX_MAX])(Kex *);
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};
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int kex_names_valid(const char *);
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char *kex_alg_list(char);
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Kex *kex_setup(char *[PROPOSAL_MAX]);
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void kex_finish(Kex *);
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void kex_send_kexinit(Kex *);
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void kex_input_kexinit(int, u_int32_t, void *);
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void kex_derive_keys(Kex *, u_char *, u_int, const u_char *, u_int);
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void kex_derive_keys_bn(Kex *, u_char *, u_int, const BIGNUM *);
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Newkeys *kex_get_newkeys(int);
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void kexdh_client(Kex *);
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void kexdh_server(Kex *);
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void kexgex_client(Kex *);
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void kexgex_server(Kex *);
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void kexecdh_client(Kex *);
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void kexecdh_server(Kex *);
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void kexc25519_client(Kex *);
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void kexc25519_server(Kex *);
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void
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kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
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BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
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void
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kexgex_hash(int, char *, char *, char *, int, char *,
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int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
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BIGNUM *, BIGNUM *, u_char **, u_int *);
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#ifdef OPENSSL_HAS_ECC
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void
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kex_ecdh_hash(int, const EC_GROUP *, char *, char *, char *, int,
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char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
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const BIGNUM *, u_char **, u_int *);
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#endif
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void
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kex_c25519_hash(int, char *, char *, char *, int,
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char *, int, u_char *, int, const u_char *, const u_char *,
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const u_char *, u_int, u_char **, u_int *);
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#define CURVE25519_SIZE 32
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void kexc25519_keygen(u_char[CURVE25519_SIZE], u_char[CURVE25519_SIZE])
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__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
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__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
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void kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
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const u_char pub[CURVE25519_SIZE], Buffer *out)
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__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
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__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
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void
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derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
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#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
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void dump_digest(char *, u_char *, int);
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#endif
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#endif
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