Annotation of src/usr.bin/ssh/kex.h, Revision 1.110
1.110 ! djm 1: /* $OpenBSD: kex.h,v 1.109 2019/09/06 05:23:55 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"
1.99 djm 58: #define KEX_SNTRUP4591761X25519_SHA512 "sntrup4591761x25519-sha512@tinyssh.org"
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,
1.99 djm 97: KEX_KEM_SNTRUP4591761X25519_SHA512,
1.33 markus 98: KEX_MAX
1.5 provos 99: };
1.13 stevesk 100:
1.110 ! djm 101: /* kex->flags values */
! 102: #define KEX_INIT_SENT 0x0001 /* KEXINIT sent */
! 103: #define KEX_INITIAL 0x0002 /* Initial KEX, not rekey */
! 104: #define KEX_HOSTCERT_CONVERT 0x0004 /* Client downgraded hostcert->plain */
1.19 markus 105:
1.67 markus 106: struct sshenc {
1.19 markus 107: char *name;
1.67 markus 108: const struct sshcipher *cipher;
1.19 markus 109: int enabled;
1.29 markus 110: u_int key_len;
1.54 markus 111: u_int iv_len;
1.29 markus 112: u_int block_size;
1.10 markus 113: u_char *key;
114: u_char *iv;
1.1 markus 115: };
1.67 markus 116: struct sshcomp {
117: u_int type;
1.19 markus 118: int enabled;
119: char *name;
120: };
1.67 markus 121: struct newkeys {
122: struct sshenc enc;
123: struct sshmac mac;
1.69 markus 124: struct sshcomp comp;
1.1 markus 125: };
1.69 markus 126:
127: struct ssh;
128:
1.67 markus 129: struct kex {
1.19 markus 130: u_char *session_id;
1.67 markus 131: size_t session_id_len;
132: struct newkeys *newkeys[MODE_MAX];
1.36 djm 133: u_int we_need;
1.61 dtucker 134: u_int dh_need;
1.19 markus 135: int server;
136: char *name;
1.74 markus 137: char *hostkey_alg;
1.19 markus 138: int hostkey_type;
1.70 djm 139: int hostkey_nid;
1.69 markus 140: u_int kex_type;
1.84 djm 141: char *server_sig_algs;
1.74 markus 142: int ext_info_c;
1.67 markus 143: struct sshbuf *my;
144: struct sshbuf *peer;
1.93 djm 145: struct sshbuf *client_version;
146: struct sshbuf *server_version;
1.42 djm 147: sig_atomic_t done;
1.69 markus 148: u_int flags;
1.59 djm 149: int hash_alg;
1.55 djm 150: int ec_nid;
1.72 djm 151: char *failed_choice;
1.69 markus 152: int (*verify_host_key)(struct sshkey *, struct ssh *);
1.70 djm 153: struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
154: struct sshkey *(*load_host_private_key)(int, int, struct ssh *);
1.71 djm 155: int (*host_key_index)(struct sshkey *, int, struct ssh *);
1.94 djm 156: int (*sign)(struct ssh *, struct sshkey *, struct sshkey *,
157: u_char **, size_t *, const u_char *, size_t, const char *);
1.69 markus 158: int (*kex[KEX_MAX])(struct ssh *);
159: /* kex specific state */
160: DH *dh; /* DH */
161: u_int min, max, nbits; /* GEX */
162: EC_KEY *ec_client_key; /* ECDH */
163: const EC_GROUP *ec_group; /* ECDH */
1.99 djm 164: u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 + KEM */
1.69 markus 165: u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */
1.99 djm 166: u_char sntrup4591761_client_key[crypto_kem_sntrup4591761_SECRETKEYBYTES]; /* KEM */
1.106 djm 167: struct sshbuf *client_pub;
1.1 markus 168: };
1.52 djm 169:
170: int kex_names_valid(const char *);
1.58 dtucker 171: char *kex_alg_list(char);
1.73 djm 172: char *kex_names_cat(const char *, const char *);
1.85 djm 173: int kex_assemble_names(char **, const char *, const char *);
1.1 markus 174:
1.93 djm 175: int kex_exchange_identification(struct ssh *, int, const char *);
176:
177: struct kex *kex_new(void);
178: int kex_ready(struct ssh *, char *[PROPOSAL_MAX]);
1.69 markus 179: int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
180: void kex_free_newkeys(struct newkeys *);
181: void kex_free(struct kex *);
182:
183: int kex_buf2prop(struct sshbuf *, int *, char ***);
184: int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
185: void kex_prop_free(char **);
1.97 djm 186: int kex_load_hostkey(struct ssh *, struct sshkey **, struct sshkey **);
1.98 djm 187: int kex_verify_host_key(struct ssh *, struct sshkey *);
1.20 markus 188:
1.69 markus 189: int kex_send_kexinit(struct ssh *);
1.83 markus 190: int kex_input_kexinit(int, u_int32_t, struct ssh *);
191: int kex_input_ext_info(int, u_int32_t, struct ssh *);
1.69 markus 192: int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
193: int kex_send_newkeys(struct ssh *);
1.76 djm 194: int kex_start_rekex(struct ssh *);
1.69 markus 195:
196: int kexgex_client(struct ssh *);
197: int kexgex_server(struct ssh *);
1.105 djm 198: int kex_gen_client(struct ssh *);
199: int kex_gen_server(struct ssh *);
1.100 djm 200:
1.101 djm 201: int kex_dh_keypair(struct kex *);
1.104 djm 202: int kex_dh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
1.101 djm 203: struct sshbuf **);
1.104 djm 204: int kex_dh_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
1.101 djm 205:
1.102 djm 206: int kex_ecdh_keypair(struct kex *);
1.104 djm 207: int kex_ecdh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
1.102 djm 208: struct sshbuf **);
1.104 djm 209: int kex_ecdh_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
1.102 djm 210:
1.100 djm 211: int kex_c25519_keypair(struct kex *);
1.104 djm 212: int kex_c25519_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
1.100 djm 213: struct sshbuf **);
1.104 djm 214: int kex_c25519_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
1.99 djm 215:
216: int kex_kem_sntrup4591761x25519_keypair(struct kex *);
1.104 djm 217: int kex_kem_sntrup4591761x25519_enc(struct kex *, const struct sshbuf *,
1.99 djm 218: struct sshbuf **, struct sshbuf **);
1.104 djm 219: int kex_kem_sntrup4591761x25519_dec(struct kex *, const struct sshbuf *,
1.99 djm 220: struct sshbuf **);
1.69 markus 221:
1.95 djm 222: int kex_dh_keygen(struct kex *);
1.96 djm 223: int kex_dh_compute_key(struct kex *, BIGNUM *, struct sshbuf *);
1.69 markus 224:
1.93 djm 225: int kexgex_hash(int, const struct sshbuf *, const struct sshbuf *,
1.107 djm 226: const struct sshbuf *, const struct sshbuf *, const struct sshbuf *,
1.69 markus 227: int, int, int,
228: const BIGNUM *, const BIGNUM *, const BIGNUM *,
1.96 djm 229: const BIGNUM *, const u_char *, size_t,
1.69 markus 230: u_char *, size_t *);
1.19 markus 231:
1.69 markus 232: void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
1.64 djm 233: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
234: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.69 markus 235: int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
236: const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
1.64 djm 237: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
238: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.99 djm 239: int kexc25519_shared_key_ext(const u_char key[CURVE25519_SIZE],
240: const u_char pub[CURVE25519_SIZE], struct sshbuf *out, int)
241: __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
242: __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
1.18 markus 243:
1.50 djm 244: #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
1.99 djm 245: void dump_digest(const char *, const u_char *, int);
1.18 markus 246: #endif
1.1 markus 247:
248: #endif
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