Annotation of src/usr.bin/ssh/kex.h, Revision 1.76
1.76 ! djm 1: /* $OpenBSD: kex.h,v 1.75 2016/01/14 16:17:39 markus 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:
1.38 djm 39: #define KEX_DH1 "diffie-hellman-group1-sha1"
40: #define KEX_DH14 "diffie-hellman-group14-sha1"
41: #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
1.39 djm 42: #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
1.55 djm 43: #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
44: #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
45: #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
1.57 markus 46: #define KEX_CURVE25519_SHA256 "curve25519-sha256@libssh.org"
1.37 markus 47:
48: #define COMP_NONE 0
49: #define COMP_ZLIB 1
50: #define COMP_DELAYED 2
1.1 markus 51:
1.69 markus 52: #define CURVE25519_SIZE 32
53:
1.1 markus 54: enum kex_init_proposals {
55: PROPOSAL_KEX_ALGS,
56: PROPOSAL_SERVER_HOST_KEY_ALGS,
57: PROPOSAL_ENC_ALGS_CTOS,
58: PROPOSAL_ENC_ALGS_STOC,
59: PROPOSAL_MAC_ALGS_CTOS,
60: PROPOSAL_MAC_ALGS_STOC,
61: PROPOSAL_COMP_ALGS_CTOS,
62: PROPOSAL_COMP_ALGS_STOC,
63: PROPOSAL_LANG_CTOS,
64: PROPOSAL_LANG_STOC,
65: PROPOSAL_MAX
66: };
67:
68: enum kex_modes {
69: MODE_IN,
70: MODE_OUT,
71: MODE_MAX
72: };
73:
1.5 provos 74: enum kex_exchange {
1.33 markus 75: KEX_DH_GRP1_SHA1,
1.35 djm 76: KEX_DH_GRP14_SHA1,
1.33 markus 77: KEX_DH_GEX_SHA1,
1.39 djm 78: KEX_DH_GEX_SHA256,
1.50 djm 79: KEX_ECDH_SHA2,
1.57 markus 80: KEX_C25519_SHA256,
1.33 markus 81: KEX_MAX
1.5 provos 82: };
1.13 stevesk 83:
1.19 markus 84: #define KEX_INIT_SENT 0x0001
85:
1.67 markus 86: struct sshenc {
1.19 markus 87: char *name;
1.67 markus 88: const struct sshcipher *cipher;
1.19 markus 89: int enabled;
1.29 markus 90: u_int key_len;
1.54 markus 91: u_int iv_len;
1.29 markus 92: u_int block_size;
1.10 markus 93: u_char *key;
94: u_char *iv;
1.1 markus 95: };
1.67 markus 96: struct sshcomp {
97: u_int type;
1.19 markus 98: int enabled;
99: char *name;
100: };
1.67 markus 101: struct newkeys {
102: struct sshenc enc;
103: struct sshmac mac;
1.69 markus 104: struct sshcomp comp;
1.1 markus 105: };
1.69 markus 106:
107: struct ssh;
108:
1.67 markus 109: struct kex {
1.19 markus 110: u_char *session_id;
1.67 markus 111: size_t session_id_len;
112: struct newkeys *newkeys[MODE_MAX];
1.36 djm 113: u_int we_need;
1.61 dtucker 114: u_int dh_need;
1.19 markus 115: int server;
116: char *name;
1.74 markus 117: char *hostkey_alg;
1.19 markus 118: int hostkey_type;
1.70 djm 119: int hostkey_nid;
1.69 markus 120: u_int kex_type;
1.74 markus 121: int rsa_sha2;
122: int ext_info_c;
1.67 markus 123: struct sshbuf *my;
124: struct sshbuf *peer;
1.42 djm 125: sig_atomic_t done;
1.69 markus 126: u_int flags;
1.59 djm 127: int hash_alg;
1.55 djm 128: int ec_nid;
1.19 markus 129: char *client_version_string;
130: char *server_version_string;
1.72 djm 131: char *failed_choice;
1.69 markus 132: int (*verify_host_key)(struct sshkey *, struct ssh *);
1.70 djm 133: struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
134: struct sshkey *(*load_host_private_key)(int, int, struct ssh *);
1.71 djm 135: int (*host_key_index)(struct sshkey *, int, struct ssh *);
1.74 markus 136: int (*sign)(struct sshkey *, struct sshkey *, u_char **, size_t *,
137: const u_char *, size_t, const char *, u_int);
1.69 markus 138: int (*kex[KEX_MAX])(struct ssh *);
139: /* kex specific state */
140: DH *dh; /* DH */
141: u_int min, max, nbits; /* GEX */
142: EC_KEY *ec_client_key; /* ECDH */
143: const EC_GROUP *ec_group; /* ECDH */
144: u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 */
145: u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */
1.1 markus 146: };
1.52 djm 147:
148: int kex_names_valid(const char *);
1.58 dtucker 149: char *kex_alg_list(char);
1.73 djm 150: char *kex_names_cat(const char *, const char *);
151: int kex_assemble_names(const char *, char **);
1.1 markus 152:
1.69 markus 153: int kex_new(struct ssh *, char *[PROPOSAL_MAX], struct kex **);
154: int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
155: void kex_free_newkeys(struct newkeys *);
156: void kex_free(struct kex *);
157:
158: int kex_buf2prop(struct sshbuf *, int *, char ***);
159: int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
160: void kex_prop_free(char **);
1.20 markus 161:
1.69 markus 162: int kex_send_kexinit(struct ssh *);
1.68 markus 163: int kex_input_kexinit(int, u_int32_t, void *);
1.74 markus 164: int kex_input_ext_info(int, u_int32_t, void *);
1.69 markus 165: int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
166: int kex_derive_keys_bn(struct ssh *, u_char *, u_int, const BIGNUM *);
167: int kex_send_newkeys(struct ssh *);
1.76 ! djm 168: int kex_start_rekex(struct ssh *);
1.69 markus 169:
170: int kexdh_client(struct ssh *);
171: int kexdh_server(struct ssh *);
172: int kexgex_client(struct ssh *);
173: int kexgex_server(struct ssh *);
174: int kexecdh_client(struct ssh *);
175: int kexecdh_server(struct ssh *);
176: int kexc25519_client(struct ssh *);
177: int kexc25519_server(struct ssh *);
178:
179: int kex_dh_hash(const char *, const char *,
180: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
181: const BIGNUM *, const BIGNUM *, const BIGNUM *, u_char *, size_t *);
182:
183: int kexgex_hash(int, const char *, const char *,
184: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
185: int, int, int,
186: const BIGNUM *, const BIGNUM *, const BIGNUM *,
187: const BIGNUM *, const BIGNUM *,
188: u_char *, size_t *);
189:
190: int kex_ecdh_hash(int, const EC_GROUP *, const char *, const char *,
191: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
192: const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char *, size_t *);
193:
194: int kex_c25519_hash(int, const char *, const char *, const char *, size_t,
195: const char *, size_t, const u_char *, size_t, const u_char *, const u_char *,
196: const u_char *, size_t, u_char *, size_t *);
1.19 markus 197:
1.69 markus 198: void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
1.64 djm 199: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
200: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.69 markus 201: int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
202: const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
1.64 djm 203: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
204: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.34 markus 205:
1.69 markus 206: int
1.34 markus 207: derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
1.18 markus 208:
1.50 djm 209: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.25 itojun 210: void dump_digest(char *, u_char *, int);
1.18 markus 211: #endif
1.1 markus 212:
213: #endif
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