Annotation of src/usr.bin/ssh/kex.h, Revision 1.85
1.85 ! djm 1: /* $OpenBSD: kex.h,v 1.84 2018/07/03 11:39:54 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:
1.69 markus 33: #ifdef WITH_LEAKMALLOC
34: #include "leakmalloc.h"
35: #endif
36:
1.47 andreas 37: #define KEX_COOKIE_LEN 16
1.14 markus 38:
1.79 djm 39: #define KEX_DH1 "diffie-hellman-group1-sha1"
40: #define KEX_DH14_SHA1 "diffie-hellman-group14-sha1"
41: #define KEX_DH14_SHA256 "diffie-hellman-group14-sha256"
42: #define KEX_DH16_SHA512 "diffie-hellman-group16-sha512"
43: #define KEX_DH18_SHA512 "diffie-hellman-group18-sha512"
44: #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
45: #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
46: #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
47: #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
48: #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
49: #define KEX_CURVE25519_SHA256 "curve25519-sha256"
50: #define KEX_CURVE25519_SHA256_OLD "curve25519-sha256@libssh.org"
1.37 markus 51:
52: #define COMP_NONE 0
1.81 djm 53: #define COMP_ZLIB 1
54: #define COMP_DELAYED 2
1.1 markus 55:
1.69 markus 56: #define CURVE25519_SIZE 32
57:
1.1 markus 58: enum kex_init_proposals {
59: PROPOSAL_KEX_ALGS,
60: PROPOSAL_SERVER_HOST_KEY_ALGS,
61: PROPOSAL_ENC_ALGS_CTOS,
62: PROPOSAL_ENC_ALGS_STOC,
63: PROPOSAL_MAC_ALGS_CTOS,
64: PROPOSAL_MAC_ALGS_STOC,
65: PROPOSAL_COMP_ALGS_CTOS,
66: PROPOSAL_COMP_ALGS_STOC,
67: PROPOSAL_LANG_CTOS,
68: PROPOSAL_LANG_STOC,
69: PROPOSAL_MAX
70: };
71:
72: enum kex_modes {
73: MODE_IN,
74: MODE_OUT,
75: MODE_MAX
76: };
77:
1.5 provos 78: enum kex_exchange {
1.33 markus 79: KEX_DH_GRP1_SHA1,
1.35 djm 80: KEX_DH_GRP14_SHA1,
1.78 djm 81: KEX_DH_GRP14_SHA256,
82: KEX_DH_GRP16_SHA512,
83: KEX_DH_GRP18_SHA512,
1.33 markus 84: KEX_DH_GEX_SHA1,
1.39 djm 85: KEX_DH_GEX_SHA256,
1.50 djm 86: KEX_ECDH_SHA2,
1.57 markus 87: KEX_C25519_SHA256,
1.33 markus 88: KEX_MAX
1.5 provos 89: };
1.13 stevesk 90:
1.19 markus 91: #define KEX_INIT_SENT 0x0001
92:
1.67 markus 93: struct sshenc {
1.19 markus 94: char *name;
1.67 markus 95: const struct sshcipher *cipher;
1.19 markus 96: int enabled;
1.29 markus 97: u_int key_len;
1.54 markus 98: u_int iv_len;
1.29 markus 99: u_int block_size;
1.10 markus 100: u_char *key;
101: u_char *iv;
1.1 markus 102: };
1.67 markus 103: struct sshcomp {
104: u_int type;
1.19 markus 105: int enabled;
106: char *name;
107: };
1.67 markus 108: struct newkeys {
109: struct sshenc enc;
110: struct sshmac mac;
1.69 markus 111: struct sshcomp comp;
1.1 markus 112: };
1.69 markus 113:
114: struct ssh;
115:
1.67 markus 116: struct kex {
1.19 markus 117: u_char *session_id;
1.67 markus 118: size_t session_id_len;
119: struct newkeys *newkeys[MODE_MAX];
1.36 djm 120: u_int we_need;
1.61 dtucker 121: u_int dh_need;
1.19 markus 122: int server;
123: char *name;
1.74 markus 124: char *hostkey_alg;
1.19 markus 125: int hostkey_type;
1.70 djm 126: int hostkey_nid;
1.69 markus 127: u_int kex_type;
1.84 djm 128: char *server_sig_algs;
1.74 markus 129: int ext_info_c;
1.67 markus 130: struct sshbuf *my;
131: struct sshbuf *peer;
1.42 djm 132: sig_atomic_t done;
1.69 markus 133: u_int flags;
1.59 djm 134: int hash_alg;
1.55 djm 135: int ec_nid;
1.19 markus 136: char *client_version_string;
137: char *server_version_string;
1.72 djm 138: char *failed_choice;
1.69 markus 139: int (*verify_host_key)(struct sshkey *, struct ssh *);
1.70 djm 140: struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
141: struct sshkey *(*load_host_private_key)(int, int, struct ssh *);
1.71 djm 142: int (*host_key_index)(struct sshkey *, int, struct ssh *);
1.74 markus 143: int (*sign)(struct sshkey *, struct sshkey *, u_char **, size_t *,
144: const u_char *, size_t, const char *, u_int);
1.69 markus 145: int (*kex[KEX_MAX])(struct ssh *);
146: /* kex specific state */
147: DH *dh; /* DH */
148: u_int min, max, nbits; /* GEX */
149: EC_KEY *ec_client_key; /* ECDH */
150: const EC_GROUP *ec_group; /* ECDH */
151: u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 */
152: u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */
1.1 markus 153: };
1.52 djm 154:
155: int kex_names_valid(const char *);
1.58 dtucker 156: char *kex_alg_list(char);
1.73 djm 157: char *kex_names_cat(const char *, const char *);
1.85 ! djm 158: int kex_assemble_names(char **, const char *, const char *);
1.1 markus 159:
1.69 markus 160: int kex_new(struct ssh *, char *[PROPOSAL_MAX], struct kex **);
161: int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
162: void kex_free_newkeys(struct newkeys *);
163: void kex_free(struct kex *);
164:
165: int kex_buf2prop(struct sshbuf *, int *, char ***);
166: int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
167: void kex_prop_free(char **);
1.20 markus 168:
1.69 markus 169: int kex_send_kexinit(struct ssh *);
1.83 markus 170: int kex_input_kexinit(int, u_int32_t, struct ssh *);
171: int kex_input_ext_info(int, u_int32_t, struct ssh *);
1.69 markus 172: int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
173: int kex_derive_keys_bn(struct ssh *, u_char *, u_int, const BIGNUM *);
174: int kex_send_newkeys(struct ssh *);
1.76 djm 175: int kex_start_rekex(struct ssh *);
1.69 markus 176:
177: int kexdh_client(struct ssh *);
178: int kexdh_server(struct ssh *);
179: int kexgex_client(struct ssh *);
180: int kexgex_server(struct ssh *);
181: int kexecdh_client(struct ssh *);
182: int kexecdh_server(struct ssh *);
183: int kexc25519_client(struct ssh *);
184: int kexc25519_server(struct ssh *);
185:
1.78 djm 186: int kex_dh_hash(int, const char *, const char *,
1.69 markus 187: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
188: const BIGNUM *, const BIGNUM *, const BIGNUM *, u_char *, size_t *);
189:
190: int kexgex_hash(int, const char *, const char *,
191: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
192: int, int, int,
193: const BIGNUM *, const BIGNUM *, const BIGNUM *,
194: const BIGNUM *, const BIGNUM *,
195: u_char *, size_t *);
196:
197: int kex_ecdh_hash(int, const EC_GROUP *, const char *, const char *,
198: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
199: const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char *, size_t *);
200:
1.77 djm 201: int kex_c25519_hash(int, const char *, const char *,
202: const u_char *, size_t, const u_char *, size_t,
203: const u_char *, size_t, const u_char *, const u_char *,
1.69 markus 204: const u_char *, size_t, u_char *, size_t *);
1.19 markus 205:
1.69 markus 206: void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
1.64 djm 207: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
208: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.69 markus 209: int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
210: const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
1.64 djm 211: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
212: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.18 markus 213:
1.50 djm 214: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.25 itojun 215: void dump_digest(char *, u_char *, int);
1.18 markus 216: #endif
1.1 markus 217:
218: #endif