Annotation of src/usr.bin/ssh/kex.h, Revision 1.78
1.78 ! djm 1: /* $OpenBSD: kex.h,v 1.77 2016/05/02 08:49:03 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:
1.38 djm 39: #define KEX_DH1 "diffie-hellman-group1-sha1"
1.78 ! djm 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"
1.38 djm 44: #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
1.39 djm 45: #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
1.55 djm 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"
1.57 markus 49: #define KEX_CURVE25519_SHA256 "curve25519-sha256@libssh.org"
1.37 markus 50:
51: #define COMP_NONE 0
52: #define COMP_ZLIB 1
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
91:
1.67 markus 92: struct sshenc {
1.19 markus 93: char *name;
1.67 markus 94: const struct sshcipher *cipher;
1.19 markus 95: int enabled;
1.29 markus 96: u_int key_len;
1.54 markus 97: u_int iv_len;
1.29 markus 98: u_int block_size;
1.10 markus 99: u_char *key;
100: u_char *iv;
1.1 markus 101: };
1.67 markus 102: struct sshcomp {
103: u_int type;
1.19 markus 104: int enabled;
105: char *name;
106: };
1.67 markus 107: struct newkeys {
108: struct sshenc enc;
109: struct sshmac mac;
1.69 markus 110: struct sshcomp comp;
1.1 markus 111: };
1.69 markus 112:
113: struct ssh;
114:
1.67 markus 115: struct kex {
1.19 markus 116: u_char *session_id;
1.67 markus 117: size_t session_id_len;
118: struct newkeys *newkeys[MODE_MAX];
1.36 djm 119: u_int we_need;
1.61 dtucker 120: u_int dh_need;
1.19 markus 121: int server;
122: char *name;
1.74 markus 123: char *hostkey_alg;
1.19 markus 124: int hostkey_type;
1.70 djm 125: int hostkey_nid;
1.69 markus 126: u_int kex_type;
1.74 markus 127: int rsa_sha2;
128: int ext_info_c;
1.67 markus 129: struct sshbuf *my;
130: struct sshbuf *peer;
1.42 djm 131: sig_atomic_t done;
1.69 markus 132: u_int flags;
1.59 djm 133: int hash_alg;
1.55 djm 134: int ec_nid;
1.19 markus 135: char *client_version_string;
136: char *server_version_string;
1.72 djm 137: char *failed_choice;
1.69 markus 138: int (*verify_host_key)(struct sshkey *, struct ssh *);
1.70 djm 139: struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
140: struct sshkey *(*load_host_private_key)(int, int, struct ssh *);
1.71 djm 141: int (*host_key_index)(struct sshkey *, int, struct ssh *);
1.74 markus 142: int (*sign)(struct sshkey *, struct sshkey *, u_char **, size_t *,
143: const u_char *, size_t, const char *, u_int);
1.69 markus 144: int (*kex[KEX_MAX])(struct ssh *);
145: /* kex specific state */
146: DH *dh; /* DH */
147: u_int min, max, nbits; /* GEX */
148: EC_KEY *ec_client_key; /* ECDH */
149: const EC_GROUP *ec_group; /* ECDH */
150: u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 */
151: u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */
1.1 markus 152: };
1.52 djm 153:
154: int kex_names_valid(const char *);
1.58 dtucker 155: char *kex_alg_list(char);
1.73 djm 156: char *kex_names_cat(const char *, const char *);
157: int kex_assemble_names(const char *, char **);
1.1 markus 158:
1.69 markus 159: int kex_new(struct ssh *, char *[PROPOSAL_MAX], struct kex **);
160: int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
161: void kex_free_newkeys(struct newkeys *);
162: void kex_free(struct kex *);
163:
164: int kex_buf2prop(struct sshbuf *, int *, char ***);
165: int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
166: void kex_prop_free(char **);
1.20 markus 167:
1.69 markus 168: int kex_send_kexinit(struct ssh *);
1.68 markus 169: int kex_input_kexinit(int, u_int32_t, void *);
1.74 markus 170: int kex_input_ext_info(int, u_int32_t, void *);
1.69 markus 171: int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
172: int kex_derive_keys_bn(struct ssh *, u_char *, u_int, const BIGNUM *);
173: int kex_send_newkeys(struct ssh *);
1.76 djm 174: int kex_start_rekex(struct ssh *);
1.69 markus 175:
176: int kexdh_client(struct ssh *);
177: int kexdh_server(struct ssh *);
178: int kexgex_client(struct ssh *);
179: int kexgex_server(struct ssh *);
180: int kexecdh_client(struct ssh *);
181: int kexecdh_server(struct ssh *);
182: int kexc25519_client(struct ssh *);
183: int kexc25519_server(struct ssh *);
184:
1.78 ! djm 185: int kex_dh_hash(int, const char *, const char *,
1.69 markus 186: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
187: const BIGNUM *, const BIGNUM *, const BIGNUM *, u_char *, size_t *);
188:
189: int kexgex_hash(int, const char *, const char *,
190: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
191: int, int, int,
192: const BIGNUM *, const BIGNUM *, const BIGNUM *,
193: const BIGNUM *, const BIGNUM *,
194: u_char *, size_t *);
195:
196: int kex_ecdh_hash(int, const EC_GROUP *, const char *, const char *,
197: const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
198: const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char *, size_t *);
199:
1.77 djm 200: int kex_c25519_hash(int, const char *, const char *,
201: const u_char *, size_t, const u_char *, size_t,
202: const u_char *, size_t, const u_char *, const u_char *,
1.69 markus 203: const u_char *, size_t, u_char *, size_t *);
1.19 markus 204:
1.69 markus 205: void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
1.64 djm 206: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
207: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.69 markus 208: int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
209: const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
1.64 djm 210: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
211: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.34 markus 212:
1.69 markus 213: int
1.34 markus 214: derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
1.18 markus 215:
1.50 djm 216: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.25 itojun 217: void dump_digest(char *, u_char *, int);
1.18 markus 218: #endif
1.1 markus 219:
220: #endif