Annotation of src/usr.bin/ssh/kex.h, Revision 1.67
1.67 ! markus 1: /* $OpenBSD: kex.h,v 1.66 2015/01/15 09:40:00 djm Exp $ */
1.12 niklas 2:
1.1 markus 3: /*
1.24 markus 4: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.1 markus 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26: #ifndef KEX_H
27: #define KEX_H
28:
1.65 markus 29: #include "mac.h"
1.66 djm 30: #include "buffer.h" /* XXX for typedef */
31: #include "key.h" /* XXX for typedef */
1.47 andreas 32:
33: #define KEX_COOKIE_LEN 16
1.14 markus 34:
1.38 djm 35: #define KEX_DH1 "diffie-hellman-group1-sha1"
36: #define KEX_DH14 "diffie-hellman-group14-sha1"
37: #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
1.39 djm 38: #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
1.48 andreas 39: #define KEX_RESUME "resume@appgate.com"
1.55 djm 40: #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
41: #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
42: #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
1.57 markus 43: #define KEX_CURVE25519_SHA256 "curve25519-sha256@libssh.org"
1.37 markus 44:
45: #define COMP_NONE 0
46: #define COMP_ZLIB 1
47: #define COMP_DELAYED 2
1.1 markus 48:
49: enum kex_init_proposals {
50: PROPOSAL_KEX_ALGS,
51: PROPOSAL_SERVER_HOST_KEY_ALGS,
52: PROPOSAL_ENC_ALGS_CTOS,
53: PROPOSAL_ENC_ALGS_STOC,
54: PROPOSAL_MAC_ALGS_CTOS,
55: PROPOSAL_MAC_ALGS_STOC,
56: PROPOSAL_COMP_ALGS_CTOS,
57: PROPOSAL_COMP_ALGS_STOC,
58: PROPOSAL_LANG_CTOS,
59: PROPOSAL_LANG_STOC,
60: PROPOSAL_MAX
61: };
62:
63: enum kex_modes {
64: MODE_IN,
65: MODE_OUT,
66: MODE_MAX
67: };
68:
1.5 provos 69: enum kex_exchange {
1.33 markus 70: KEX_DH_GRP1_SHA1,
1.35 djm 71: KEX_DH_GRP14_SHA1,
1.33 markus 72: KEX_DH_GEX_SHA1,
1.39 djm 73: KEX_DH_GEX_SHA256,
1.50 djm 74: KEX_ECDH_SHA2,
1.57 markus 75: KEX_C25519_SHA256,
1.33 markus 76: KEX_MAX
1.5 provos 77: };
1.13 stevesk 78:
1.19 markus 79: #define KEX_INIT_SENT 0x0001
80:
1.67 ! markus 81: typedef struct kex Kex;
! 82: typedef struct sshcomp Comp;
1.65 markus 83: typedef struct sshmac Mac;
1.67 ! markus 84: typedef struct sshenc Enc;
! 85: typedef struct newkeys Newkeys;
1.1 markus 86:
1.67 ! markus 87: struct sshenc {
1.19 markus 88: char *name;
1.67 ! markus 89: const struct sshcipher *cipher;
1.19 markus 90: int enabled;
1.29 markus 91: u_int key_len;
1.54 markus 92: u_int iv_len;
1.29 markus 93: u_int block_size;
1.10 markus 94: u_char *key;
95: u_char *iv;
1.1 markus 96: };
1.67 ! markus 97: struct sshcomp {
! 98: u_int type;
1.19 markus 99: int enabled;
100: char *name;
101: };
1.67 ! markus 102: struct newkeys {
! 103: struct sshenc enc;
! 104: struct sshmac mac;
! 105: struct sshcomp comp;
1.1 markus 106: };
1.67 ! markus 107: struct kex {
1.19 markus 108: u_char *session_id;
1.67 ! markus 109: size_t session_id_len;
! 110: struct newkeys *newkeys[MODE_MAX];
1.36 djm 111: u_int we_need;
1.61 dtucker 112: u_int dh_need;
1.19 markus 113: int server;
114: char *name;
115: int hostkey_type;
116: int kex_type;
1.48 andreas 117: int roaming;
1.67 ! markus 118: struct sshbuf *my;
! 119: struct sshbuf *peer;
1.42 djm 120: sig_atomic_t done;
1.19 markus 121: int flags;
1.59 djm 122: int hash_alg;
1.55 djm 123: int ec_nid;
1.19 markus 124: char *client_version_string;
125: char *server_version_string;
1.25 itojun 126: int (*verify_host_key)(Key *);
1.49 djm 127: Key *(*load_host_public_key)(int);
128: Key *(*load_host_private_key)(int);
1.30 provos 129: int (*host_key_index)(Key *);
1.56 markus 130: void (*sign)(Key *, Key *, u_char **, u_int *, u_char *, u_int);
1.33 markus 131: void (*kex[KEX_MAX])(Kex *);
1.1 markus 132: };
1.52 djm 133:
134: int kex_names_valid(const char *);
1.58 dtucker 135: char *kex_alg_list(char);
1.1 markus 136:
1.25 itojun 137: Kex *kex_setup(char *[PROPOSAL_MAX]);
1.26 markus 138: void kex_finish(Kex *);
1.67 ! markus 139: void kex_free_newkeys(struct newkeys *);
1.20 markus 140:
1.26 markus 141: void kex_send_kexinit(Kex *);
1.28 markus 142: void kex_input_kexinit(int, u_int32_t, void *);
1.60 djm 143: void kex_derive_keys(Kex *, u_char *, u_int, const u_char *, u_int);
144: void kex_derive_keys_bn(Kex *, u_char *, u_int, const BIGNUM *);
1.19 markus 145:
1.33 markus 146: void kexdh_client(Kex *);
147: void kexdh_server(Kex *);
148: void kexgex_client(Kex *);
149: void kexgex_server(Kex *);
1.50 djm 150: void kexecdh_client(Kex *);
151: void kexecdh_server(Kex *);
1.57 markus 152: void kexc25519_client(Kex *);
153: void kexc25519_server(Kex *);
1.33 markus 154:
1.38 djm 155: void
1.33 markus 156: kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
1.38 djm 157: BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
158: void
1.59 djm 159: kexgex_hash(int, char *, char *, char *, int, char *,
1.40 deraadt 160: int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
1.38 djm 161: BIGNUM *, BIGNUM *, u_char **, u_int *);
1.50 djm 162: void
1.59 djm 163: kex_ecdh_hash(int, const EC_GROUP *, char *, char *, char *, int,
1.50 djm 164: char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
165: const BIGNUM *, u_char **, u_int *);
1.57 markus 166: void
1.59 djm 167: kex_c25519_hash(int, char *, char *, char *, int,
1.57 markus 168: char *, int, u_char *, int, const u_char *, const u_char *,
1.60 djm 169: const u_char *, u_int, u_char **, u_int *);
1.57 markus 170:
171: #define CURVE25519_SIZE 32
172: void kexc25519_keygen(u_char[CURVE25519_SIZE], u_char[CURVE25519_SIZE])
1.64 djm 173: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
174: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.60 djm 175: void kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
176: const u_char pub[CURVE25519_SIZE], Buffer *out)
1.64 djm 177: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
178: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.34 markus 179:
180: void
181: derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
1.18 markus 182:
1.50 djm 183: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.25 itojun 184: void dump_digest(char *, u_char *, int);
1.18 markus 185: #endif
1.1 markus 186:
187: #endif
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