Annotation of src/crypto/external/bsd/openssh/dist/kex.h, Revision 1.17
1.11 christos 1: /* $NetBSD: kex.h,v 1.10 2015/08/13 10:33:21 christos Exp $ */
1.17 ! christos 2: /* $OpenBSD: kex.h,v 1.91 2018/07/11 18:53:29 markus Exp $ */
1.1 christos 3:
4: /*
5: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27: #ifndef KEX_H
28: #define KEX_H
29:
1.9 christos 30: #include "mac.h"
31:
32: #ifdef WITH_LEAKMALLOC
33: #include "leakmalloc.h"
34: #endif
1.1 christos 35:
1.3 christos 36: #define KEX_COOKIE_LEN 16
37:
1.14 christos 38: #define KEX_DH1 "diffie-hellman-group1-sha1"
39: #define KEX_DH14_SHA1 "diffie-hellman-group14-sha1"
40: #define KEX_DH14_SHA256 "diffie-hellman-group14-sha256"
41: #define KEX_DH16_SHA512 "diffie-hellman-group16-sha512"
42: #define KEX_DH18_SHA512 "diffie-hellman-group18-sha512"
43: #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
44: #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
45: #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
46: #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
47: #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
48: #define KEX_CURVE25519_SHA256 "curve25519-sha256"
49: #define KEX_CURVE25519_SHA256_OLD "curve25519-sha256@libssh.org"
1.1 christos 50:
51: #define COMP_NONE 0
1.17 ! christos 52: /* pre-auth compression (COMP_ZLIB) is only supported in the client */
1.1 christos 53: #define COMP_ZLIB 1
54: #define COMP_DELAYED 2
55:
1.9 christos 56: #define CURVE25519_SIZE 32
57:
1.1 christos 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:
78: enum kex_exchange {
79: KEX_DH_GRP1_SHA1,
80: KEX_DH_GRP14_SHA1,
1.13 christos 81: KEX_DH_GRP14_SHA256,
82: KEX_DH_GRP16_SHA512,
83: KEX_DH_GRP18_SHA512,
1.1 christos 84: KEX_DH_GEX_SHA1,
85: KEX_DH_GEX_SHA256,
1.5 christos 86: KEX_ECDH_SHA2,
1.8 christos 87: KEX_C25519_SHA256,
1.1 christos 88: KEX_MAX
89: };
90:
91: #define KEX_INIT_SENT 0x0001
92:
1.9 christos 93: struct sshenc {
1.1 christos 94: char *name;
1.9 christos 95: const struct sshcipher *cipher;
1.1 christos 96: int enabled;
97: u_int key_len;
1.6 christos 98: u_int iv_len;
1.1 christos 99: u_int block_size;
100: u_char *key;
101: u_char *iv;
102: };
1.9 christos 103: struct sshcomp {
104: u_int type;
1.1 christos 105: int enabled;
106: char *name;
107: };
1.9 christos 108: struct newkeys {
109: struct sshenc enc;
110: struct sshmac mac;
111: struct sshcomp comp;
1.1 christos 112: };
1.9 christos 113:
114: struct ssh;
115:
116: struct kex {
1.1 christos 117: u_char *session_id;
1.9 christos 118: size_t session_id_len;
119: struct newkeys *newkeys[MODE_MAX];
1.1 christos 120: u_int we_need;
1.8 christos 121: u_int dh_need;
1.1 christos 122: int server;
123: char *name;
1.12 christos 124: char *hostkey_alg;
1.1 christos 125: int hostkey_type;
1.9 christos 126: int hostkey_nid;
127: u_int kex_type;
1.17 ! christos 128: char *server_sig_algs;
1.12 christos 129: int ext_info_c;
1.9 christos 130: struct sshbuf *my;
131: struct sshbuf *peer;
1.1 christos 132: sig_atomic_t done;
1.9 christos 133: u_int flags;
1.8 christos 134: int hash_alg;
1.7 christos 135: int ec_nid;
1.1 christos 136: char *client_version_string;
137: char *server_version_string;
1.10 christos 138: char *failed_choice;
1.9 christos 139: int (*verify_host_key)(struct sshkey *, struct ssh *);
140: struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
141: struct sshkey *(*load_host_private_key)(int, int, struct ssh *);
142: int (*host_key_index)(struct sshkey *, int, struct ssh *);
1.12 christos 143: int (*sign)(struct sshkey *, struct sshkey *, u_char **, size_t *,
144: const u_char *, size_t, const char *, u_int);
1.9 christos 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 christos 153: };
154:
1.5 christos 155: int kex_names_valid(const char *);
1.8 christos 156: char *kex_alg_list(char);
1.10 christos 157: char *kex_names_cat(const char *, const char *);
1.17 ! christos 158: int kex_assemble_names(char **, const char *, const char *);
1.5 christos 159:
1.9 christos 160: int kex_new(struct ssh *, const char *[PROPOSAL_MAX], struct kex **);
161: int kex_setup(struct ssh *, const 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 *, const char *proposal[PROPOSAL_MAX]);
167: void kex_prop_free(char **);
168:
169: int kex_send_kexinit(struct ssh *);
1.16 christos 170: int kex_input_kexinit(int, u_int32_t, struct ssh *);
171: int kex_input_ext_info(int, u_int32_t, struct ssh *);
1.9 christos 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 *);
1.12 christos 175: int kex_start_rekex(struct ssh *);
1.9 christos 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:
1.13 christos 186: int kex_dh_hash(int, const char *, const char *,
1.9 christos 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:
1.13 christos 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 *,
1.9 christos 204: const u_char *, size_t, u_char *, size_t *);
1.8 christos 205:
1.9 christos 206: void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
1.8 christos 207: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
208: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.9 christos 209: int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
210: const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
1.8 christos 211: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
212: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.5 christos 213:
214: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.1 christos 215: void dump_digest(char *, u_char *, int);
216: #endif
217:
218: #endif
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