Annotation of src/usr.bin/ssh/kex.h, Revision 1.98
1.98 ! djm 1: /* $OpenBSD: kex.h,v 1.97 2019/01/21 10:05:09 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"
1.47 andreas 30:
1.69 markus 31: #ifdef WITH_LEAKMALLOC
32: #include "leakmalloc.h"
33: #endif
34:
1.47 andreas 35: #define KEX_COOKIE_LEN 16
1.14 markus 36:
1.79 djm 37: #define KEX_DH1 "diffie-hellman-group1-sha1"
38: #define KEX_DH14_SHA1 "diffie-hellman-group14-sha1"
39: #define KEX_DH14_SHA256 "diffie-hellman-group14-sha256"
40: #define KEX_DH16_SHA512 "diffie-hellman-group16-sha512"
41: #define KEX_DH18_SHA512 "diffie-hellman-group18-sha512"
42: #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
43: #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
44: #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
45: #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
46: #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
47: #define KEX_CURVE25519_SHA256 "curve25519-sha256"
48: #define KEX_CURVE25519_SHA256_OLD "curve25519-sha256@libssh.org"
1.37 markus 49:
50: #define COMP_NONE 0
1.90 sf 51: /* pre-auth compression (COMP_ZLIB) is only supported in the client */
1.87 sf 52: #define COMP_ZLIB 1
1.88 sf 53: #define COMP_DELAYED 2
1.1 markus 54:
1.69 markus 55: #define CURVE25519_SIZE 32
56:
1.1 markus 57: enum kex_init_proposals {
58: PROPOSAL_KEX_ALGS,
59: PROPOSAL_SERVER_HOST_KEY_ALGS,
60: PROPOSAL_ENC_ALGS_CTOS,
61: PROPOSAL_ENC_ALGS_STOC,
62: PROPOSAL_MAC_ALGS_CTOS,
63: PROPOSAL_MAC_ALGS_STOC,
64: PROPOSAL_COMP_ALGS_CTOS,
65: PROPOSAL_COMP_ALGS_STOC,
66: PROPOSAL_LANG_CTOS,
67: PROPOSAL_LANG_STOC,
68: PROPOSAL_MAX
69: };
70:
71: enum kex_modes {
72: MODE_IN,
73: MODE_OUT,
74: MODE_MAX
75: };
76:
1.5 provos 77: enum kex_exchange {
1.33 markus 78: KEX_DH_GRP1_SHA1,
1.35 djm 79: KEX_DH_GRP14_SHA1,
1.78 djm 80: KEX_DH_GRP14_SHA256,
81: KEX_DH_GRP16_SHA512,
82: KEX_DH_GRP18_SHA512,
1.33 markus 83: KEX_DH_GEX_SHA1,
1.39 djm 84: KEX_DH_GEX_SHA256,
1.50 djm 85: KEX_ECDH_SHA2,
1.57 markus 86: KEX_C25519_SHA256,
1.33 markus 87: KEX_MAX
1.5 provos 88: };
1.13 stevesk 89:
1.19 markus 90: #define KEX_INIT_SENT 0x0001
1.92 djm 91: #define KEX_INITIAL 0x0002
1.19 markus 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;
1.93 djm 132: struct sshbuf *client_version;
133: struct sshbuf *server_version;
1.42 djm 134: sig_atomic_t done;
1.69 markus 135: u_int flags;
1.59 djm 136: int hash_alg;
1.55 djm 137: int ec_nid;
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 *);
1.94 djm 143: int (*sign)(struct ssh *, struct sshkey *, struct sshkey *,
144: u_char **, size_t *, const u_char *, size_t, const char *);
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:
1.93 djm 160: int kex_exchange_identification(struct ssh *, int, const char *);
161:
162: struct kex *kex_new(void);
163: int kex_ready(struct ssh *, char *[PROPOSAL_MAX]);
1.69 markus 164: int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
165: void kex_free_newkeys(struct newkeys *);
166: void kex_free(struct kex *);
167:
168: int kex_buf2prop(struct sshbuf *, int *, char ***);
169: int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
170: void kex_prop_free(char **);
1.97 djm 171: int kex_load_hostkey(struct ssh *, struct sshkey **, struct sshkey **);
1.98 ! djm 172: int kex_verify_host_key(struct ssh *, struct sshkey *);
1.20 markus 173:
1.69 markus 174: int kex_send_kexinit(struct ssh *);
1.83 markus 175: int kex_input_kexinit(int, u_int32_t, struct ssh *);
176: int kex_input_ext_info(int, u_int32_t, struct ssh *);
1.69 markus 177: int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
178: int kex_derive_keys_bn(struct ssh *, u_char *, u_int, const BIGNUM *);
179: int kex_send_newkeys(struct ssh *);
1.76 djm 180: int kex_start_rekex(struct ssh *);
1.69 markus 181:
182: int kexdh_client(struct ssh *);
183: int kexdh_server(struct ssh *);
184: int kexgex_client(struct ssh *);
185: int kexgex_server(struct ssh *);
186: int kexecdh_client(struct ssh *);
187: int kexecdh_server(struct ssh *);
188: int kexc25519_client(struct ssh *);
189: int kexc25519_server(struct ssh *);
190:
1.95 djm 191: int kex_dh_keygen(struct kex *);
1.96 djm 192: int kex_dh_compute_key(struct kex *, BIGNUM *, struct sshbuf *);
1.93 djm 193: int kex_dh_hash(int, const struct sshbuf *, const struct sshbuf *,
1.69 markus 194: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
1.96 djm 195: const BIGNUM *, const BIGNUM *, const u_char *, size_t, u_char *, size_t *);
1.69 markus 196:
1.93 djm 197: int kexgex_hash(int, const struct sshbuf *, const struct sshbuf *,
1.69 markus 198: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
199: int, int, int,
200: const BIGNUM *, const BIGNUM *, const BIGNUM *,
1.96 djm 201: const BIGNUM *, const u_char *, size_t,
1.69 markus 202: u_char *, size_t *);
203:
1.93 djm 204: int kex_ecdh_hash(int, const EC_GROUP *,
205: const struct sshbuf *, const struct sshbuf *,
1.69 markus 206: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
207: const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char *, size_t *);
208:
1.93 djm 209: int kex_c25519_hash(int, const struct sshbuf *, const struct sshbuf *,
1.77 djm 210: const u_char *, size_t, const u_char *, size_t,
211: const u_char *, size_t, const u_char *, const u_char *,
1.69 markus 212: const u_char *, size_t, u_char *, size_t *);
1.19 markus 213:
1.69 markus 214: void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
1.64 djm 215: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
216: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.69 markus 217: int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
218: const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
1.64 djm 219: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
220: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.18 markus 221:
1.50 djm 222: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.25 itojun 223: void dump_digest(char *, u_char *, int);
1.18 markus 224: #endif
1.1 markus 225:
226: #endif
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