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627824480c
openssh/kex.h
djm@openbsd.org 19bcf2ea2d upstream commit 
refactor activation of rekeying

This makes automatic rekeying internal to the packet code (previously
the server and client loops needed to assist). In doing to it makes
application of rekey limits more accurate by accounting for packets
about to be sent as well as packets queued during rekeying events
themselves.

Based on a patch from dtucker@ which was in turn based on a patch
Aleksander Adamowski in bz#2521; ok markus@

Upstream-ID: a441227fd64f9739850ca97b4cf794202860fcd8
2016-02-08 21:58:32 +11:00

234 lines
7.0 KiB
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/* $OpenBSD: kex.h,v 1.76 2016/02/08 10:57:07 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
#include "mac.h"
#include "buffer.h" /* XXX for typedef */
#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 "diffie-hellman-group14-sha1"
#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@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;
char *hostkey_alg;
int hostkey_type;
int hostkey_nid;
u_int kex_type;
int rsa_sha2;
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(const char *, 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, void *);
int kex_input_ext_info(int, u_int32_t, void *);
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(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
#endif
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