Annotation of src/usr.bin/ssh/kex.h, Revision 1.122
1.122 ! djm 1: /* $OpenBSD: kex.h,v 1.121 2023/12/18 14:45:49 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"
1.99 djm 30: #include "crypto_api.h"
1.109 djm 31:
32: #ifdef WITH_OPENSSL
33: #include <openssl/bn.h>
34: #include <openssl/dh.h>
35: #include <openssl/ec.h>
36: #include <openssl/ecdsa.h>
37: #else /* OPENSSL */
38: #define BIGNUM void
39: #define DH void
40: #define EC_KEY void
41: #define EC_GROUP void
42: #endif /* WITH_OPENSSL */
1.69 markus 43:
1.47 andreas 44: #define KEX_COOKIE_LEN 16
1.14 markus 45:
1.79 djm 46: #define KEX_DH1 "diffie-hellman-group1-sha1"
47: #define KEX_DH14_SHA1 "diffie-hellman-group14-sha1"
48: #define KEX_DH14_SHA256 "diffie-hellman-group14-sha256"
49: #define KEX_DH16_SHA512 "diffie-hellman-group16-sha512"
50: #define KEX_DH18_SHA512 "diffie-hellman-group18-sha512"
51: #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
52: #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
53: #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
54: #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
55: #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
56: #define KEX_CURVE25519_SHA256 "curve25519-sha256"
57: #define KEX_CURVE25519_SHA256_OLD "curve25519-sha256@libssh.org"
1.112 djm 58: #define KEX_SNTRUP761X25519_SHA512 "sntrup761x25519-sha512@openssh.com"
1.37 markus 59:
60: #define COMP_NONE 0
1.90 sf 61: /* pre-auth compression (COMP_ZLIB) is only supported in the client */
1.87 sf 62: #define COMP_ZLIB 1
1.88 sf 63: #define COMP_DELAYED 2
1.1 markus 64:
1.69 markus 65: #define CURVE25519_SIZE 32
66:
1.1 markus 67: enum kex_init_proposals {
68: PROPOSAL_KEX_ALGS,
69: PROPOSAL_SERVER_HOST_KEY_ALGS,
70: PROPOSAL_ENC_ALGS_CTOS,
71: PROPOSAL_ENC_ALGS_STOC,
72: PROPOSAL_MAC_ALGS_CTOS,
73: PROPOSAL_MAC_ALGS_STOC,
74: PROPOSAL_COMP_ALGS_CTOS,
75: PROPOSAL_COMP_ALGS_STOC,
76: PROPOSAL_LANG_CTOS,
77: PROPOSAL_LANG_STOC,
78: PROPOSAL_MAX
79: };
80:
81: enum kex_modes {
82: MODE_IN,
83: MODE_OUT,
84: MODE_MAX
85: };
86:
1.5 provos 87: enum kex_exchange {
1.33 markus 88: KEX_DH_GRP1_SHA1,
1.35 djm 89: KEX_DH_GRP14_SHA1,
1.78 djm 90: KEX_DH_GRP14_SHA256,
91: KEX_DH_GRP16_SHA512,
92: KEX_DH_GRP18_SHA512,
1.33 markus 93: KEX_DH_GEX_SHA1,
1.39 djm 94: KEX_DH_GEX_SHA256,
1.50 djm 95: KEX_ECDH_SHA2,
1.57 markus 96: KEX_C25519_SHA256,
1.112 djm 97: KEX_KEM_SNTRUP761X25519_SHA512,
1.33 markus 98: KEX_MAX
1.5 provos 99: };
1.13 stevesk 100:
1.116 djm 101: /* kex->flags */
102: #define KEX_INIT_SENT 0x0001
103: #define KEX_INITIAL 0x0002
104: #define KEX_HAS_PUBKEY_HOSTBOUND 0x0004
1.122 ! djm 105: #define KEX_RSA_SHA2_256_SUPPORTED 0x0008 /* only set in server for now */
! 106: #define KEX_RSA_SHA2_512_SUPPORTED 0x0010 /* only set in server for now */
! 107: #define KEX_HAS_PING 0x0020
! 108: #define KEX_HAS_EXT_INFO_IN_AUTH 0x0040
1.19 markus 109:
1.67 markus 110: struct sshenc {
1.19 markus 111: char *name;
1.67 markus 112: const struct sshcipher *cipher;
1.19 markus 113: int enabled;
1.29 markus 114: u_int key_len;
1.54 markus 115: u_int iv_len;
1.29 markus 116: u_int block_size;
1.10 markus 117: u_char *key;
118: u_char *iv;
1.1 markus 119: };
1.67 markus 120: struct sshcomp {
121: u_int type;
1.19 markus 122: int enabled;
123: char *name;
124: };
1.67 markus 125: struct newkeys {
126: struct sshenc enc;
127: struct sshmac mac;
1.69 markus 128: struct sshcomp comp;
1.1 markus 129: };
1.69 markus 130:
131: struct ssh;
1.115 djm 132: struct sshbuf;
1.69 markus 133:
1.67 markus 134: struct kex {
135: struct newkeys *newkeys[MODE_MAX];
1.36 djm 136: u_int we_need;
1.61 dtucker 137: u_int dh_need;
1.19 markus 138: int server;
139: char *name;
1.74 markus 140: char *hostkey_alg;
1.19 markus 141: int hostkey_type;
1.70 djm 142: int hostkey_nid;
1.69 markus 143: u_int kex_type;
1.84 djm 144: char *server_sig_algs;
1.74 markus 145: int ext_info_c;
1.121 djm 146: int ext_info_s;
1.120 djm 147: int kex_strict;
1.121 djm 148: int ext_info_received;
1.67 markus 149: struct sshbuf *my;
150: struct sshbuf *peer;
1.93 djm 151: struct sshbuf *client_version;
152: struct sshbuf *server_version;
1.113 djm 153: struct sshbuf *session_id;
1.115 djm 154: struct sshbuf *initial_sig;
155: struct sshkey *initial_hostkey;
1.42 djm 156: sig_atomic_t done;
1.69 markus 157: u_int flags;
1.59 djm 158: int hash_alg;
1.55 djm 159: int ec_nid;
1.72 djm 160: char *failed_choice;
1.69 markus 161: int (*verify_host_key)(struct sshkey *, struct ssh *);
1.70 djm 162: struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
163: struct sshkey *(*load_host_private_key)(int, int, struct ssh *);
1.71 djm 164: int (*host_key_index)(struct sshkey *, int, struct ssh *);
1.94 djm 165: int (*sign)(struct ssh *, struct sshkey *, struct sshkey *,
166: u_char **, size_t *, const u_char *, size_t, const char *);
1.69 markus 167: int (*kex[KEX_MAX])(struct ssh *);
168: /* kex specific state */
169: DH *dh; /* DH */
170: u_int min, max, nbits; /* GEX */
171: EC_KEY *ec_client_key; /* ECDH */
172: const EC_GROUP *ec_group; /* ECDH */
1.99 djm 173: u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 + KEM */
1.69 markus 174: u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */
1.112 djm 175: u_char sntrup761_client_key[crypto_kem_sntrup761_SECRETKEYBYTES]; /* KEM */
1.106 djm 176: struct sshbuf *client_pub;
1.1 markus 177: };
1.52 djm 178:
179: int kex_names_valid(const char *);
1.58 dtucker 180: char *kex_alg_list(char);
1.73 djm 181: char *kex_names_cat(const char *, const char *);
1.85 djm 182: int kex_assemble_names(char **, const char *, const char *);
1.118 dtucker 183: void kex_proposal_populate_entries(struct ssh *, char *prop[PROPOSAL_MAX],
184: const char *, const char *, const char *, const char *, const char *);
185: void kex_proposal_free_entries(char *prop[PROPOSAL_MAX]);
1.1 markus 186:
1.93 djm 187: int kex_exchange_identification(struct ssh *, int, const char *);
188:
189: struct kex *kex_new(void);
190: int kex_ready(struct ssh *, char *[PROPOSAL_MAX]);
1.69 markus 191: int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
192: void kex_free_newkeys(struct newkeys *);
193: void kex_free(struct kex *);
194:
195: int kex_buf2prop(struct sshbuf *, int *, char ***);
196: int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
197: void kex_prop_free(char **);
1.97 djm 198: int kex_load_hostkey(struct ssh *, struct sshkey **, struct sshkey **);
1.98 djm 199: int kex_verify_host_key(struct ssh *, struct sshkey *);
1.20 markus 200:
1.69 markus 201: int kex_send_kexinit(struct ssh *);
1.83 markus 202: int kex_input_kexinit(int, u_int32_t, struct ssh *);
203: int kex_input_ext_info(int, u_int32_t, struct ssh *);
1.114 djm 204: int kex_protocol_error(int, u_int32_t, struct ssh *);
1.69 markus 205: int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
206: int kex_send_newkeys(struct ssh *);
1.76 djm 207: int kex_start_rekex(struct ssh *);
1.121 djm 208: int kex_server_update_ext_info(struct ssh *);
209: void kex_set_server_sig_algs(struct ssh *, const char *);
1.69 markus 210:
211: int kexgex_client(struct ssh *);
212: int kexgex_server(struct ssh *);
1.105 djm 213: int kex_gen_client(struct ssh *);
214: int kex_gen_server(struct ssh *);
1.100 djm 215:
1.101 djm 216: int kex_dh_keypair(struct kex *);
1.104 djm 217: int kex_dh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
1.101 djm 218: struct sshbuf **);
1.104 djm 219: int kex_dh_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
1.101 djm 220:
1.102 djm 221: int kex_ecdh_keypair(struct kex *);
1.104 djm 222: int kex_ecdh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
1.102 djm 223: struct sshbuf **);
1.104 djm 224: int kex_ecdh_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
1.102 djm 225:
1.100 djm 226: int kex_c25519_keypair(struct kex *);
1.104 djm 227: int kex_c25519_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
1.100 djm 228: struct sshbuf **);
1.104 djm 229: int kex_c25519_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
1.99 djm 230:
1.112 djm 231: int kex_kem_sntrup761x25519_keypair(struct kex *);
232: int kex_kem_sntrup761x25519_enc(struct kex *, const struct sshbuf *,
1.99 djm 233: struct sshbuf **, struct sshbuf **);
1.112 djm 234: int kex_kem_sntrup761x25519_dec(struct kex *, const struct sshbuf *,
1.99 djm 235: struct sshbuf **);
1.69 markus 236:
1.95 djm 237: int kex_dh_keygen(struct kex *);
1.96 djm 238: int kex_dh_compute_key(struct kex *, BIGNUM *, struct sshbuf *);
1.69 markus 239:
1.93 djm 240: int kexgex_hash(int, const struct sshbuf *, const struct sshbuf *,
1.107 djm 241: const struct sshbuf *, const struct sshbuf *, const struct sshbuf *,
1.69 markus 242: int, int, int,
243: const BIGNUM *, const BIGNUM *, const BIGNUM *,
1.96 djm 244: const BIGNUM *, const u_char *, size_t,
1.69 markus 245: u_char *, size_t *);
1.19 markus 246:
1.69 markus 247: void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
1.64 djm 248: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
249: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.69 markus 250: int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
251: const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
1.64 djm 252: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
253: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.99 djm 254: int kexc25519_shared_key_ext(const u_char key[CURVE25519_SIZE],
255: const u_char pub[CURVE25519_SIZE], struct sshbuf *out, int)
256: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
257: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.18 markus 258:
1.50 djm 259: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.99 djm 260: void dump_digest(const char *, const u_char *, int);
1.18 markus 261: #endif
1.1 markus 262:
263: #endif