Grid Community Toolkit  6.2.1567772254 (tag: v6.2.20190906)
kex.h
1 /* $OpenBSD: kex.h,v 1.81 2016/09/28 21:44:52 djm Exp $ */
2 
3 /*
4  * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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 
29 #include "mac.h"
30 #include "buffer.h" /* XXX for typedef */
31 #include "key.h" /* XXX for typedef */
32 
33 #ifdef WITH_LEAKMALLOC
34 #include "leakmalloc.h"
35 #endif
36 
37 #ifdef WITH_OPENSSL
38 # ifdef OPENSSL_HAS_ECC
39 # include <openssl/ec.h>
40 # else /* OPENSSL_HAS_ECC */
41 # define EC_KEY void
42 # define EC_GROUP void
43 # define EC_POINT void
44 # endif /* OPENSSL_HAS_ECC */
45 #else /* WITH_OPENSSL */
46 # define EC_KEY void
47 # define EC_GROUP void
48 # define EC_POINT void
49 #endif /* WITH_OPENSSL */
50 
51 #define KEX_COOKIE_LEN 16
52 
53 #define KEX_DH1 "diffie-hellman-group1-sha1"
54 #define KEX_DH14_SHA1 "diffie-hellman-group14-sha1"
55 #define KEX_DH14_SHA256 "diffie-hellman-group14-sha256"
56 #define KEX_DH16_SHA512 "diffie-hellman-group16-sha512"
57 #define KEX_DH18_SHA512 "diffie-hellman-group18-sha512"
58 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
59 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
60 #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
61 #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
62 #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
63 #define KEX_CURVE25519_SHA256 "curve25519-sha256"
64 #define KEX_CURVE25519_SHA256_OLD "[email protected]"
65 
66 #define COMP_NONE 0
67 #define COMP_ZLIB 1
68 #define COMP_DELAYED 2
69 
70 #define CURVE25519_SIZE 32
71 
72 enum kex_init_proposals {
73  PROPOSAL_KEX_ALGS,
74  PROPOSAL_SERVER_HOST_KEY_ALGS,
75  PROPOSAL_ENC_ALGS_CTOS,
76  PROPOSAL_ENC_ALGS_STOC,
77  PROPOSAL_MAC_ALGS_CTOS,
78  PROPOSAL_MAC_ALGS_STOC,
79  PROPOSAL_COMP_ALGS_CTOS,
80  PROPOSAL_COMP_ALGS_STOC,
81  PROPOSAL_LANG_CTOS,
82  PROPOSAL_LANG_STOC,
83  PROPOSAL_MAX
84 };
85 
86 enum kex_modes {
87  MODE_IN,
88  MODE_OUT,
89  MODE_MAX
90 };
91 
92 enum kex_exchange {
93  KEX_DH_GRP1_SHA1,
94  KEX_DH_GRP14_SHA1,
95  KEX_DH_GRP14_SHA256,
96  KEX_DH_GRP16_SHA512,
97  KEX_DH_GRP18_SHA512,
98  KEX_DH_GEX_SHA1,
99  KEX_DH_GEX_SHA256,
100  KEX_ECDH_SHA2,
101  KEX_GSS_GRP1_SHA1,
102  KEX_GSS_GRP14_SHA1,
103  KEX_GSS_GRP14_SHA256,
104  KEX_GSS_GRP16_SHA512,
105  KEX_GSS_GRP18_SHA512,
106  KEX_GSS_GEX_SHA1,
107  KEX_C25519_SHA256,
108  KEX_MAX
109 };
110 
111 #define KEX_INIT_SENT 0x0001
112 
113 struct sshenc {
114  char *name;
115  const struct sshcipher *cipher;
116  int enabled;
117  u_int key_len;
118  u_int iv_len;
119  u_int block_size;
120  u_char *key;
121  u_char *iv;
122 };
123 struct sshcomp {
124  u_int type;
125  int enabled;
126  char *name;
127 };
128 struct newkeys {
129  struct sshenc enc;
130  struct sshmac mac;
131  struct sshcomp comp;
132 };
133 
134 struct ssh;
135 
136 struct kex {
137  u_char *session_id;
138  size_t session_id_len;
139  struct newkeys *newkeys[MODE_MAX];
140  u_int we_need;
141  u_int dh_need;
142  int server;
143  char *name;
144  char *hostkey_alg;
145  int hostkey_type;
146  int hostkey_nid;
147  u_int kex_type;
148  int rsa_sha2;
149  int ext_info_c;
150  struct sshbuf *my;
151  struct sshbuf *peer;
152  sig_atomic_t done;
153  u_int flags;
154 #ifdef GSSAPI
155  int gss_deleg_creds;
156  int gss_trust_dns;
157  char *gss_host;
158  char *gss_client;
159 #endif
160  int hash_alg;
161  int ec_nid;
162  char *client_version_string;
163  char *server_version_string;
164  char *failed_choice;
165  int (*verify_host_key)(struct sshkey *, struct ssh *);
166  struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
167  struct sshkey *(*load_host_private_key)(int, int, struct ssh *);
168  int (*host_key_index)(struct sshkey *, int, struct ssh *);
169  int (*sign)(struct sshkey *, struct sshkey *, u_char **, size_t *,
170  const u_char *, size_t, const char *, u_int);
171  int (*kex[KEX_MAX])(struct ssh *);
172  /* kex specific state */
173  DH *dh; /* DH */
174  u_int min, max, nbits; /* GEX */
175  EC_KEY *ec_client_key; /* ECDH */
176  const EC_GROUP *ec_group; /* ECDH */
177  u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 */
178  u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */
179 };
180 
181 int kex_names_valid(const char *);
182 char *kex_alg_list(char);
183 char *kex_names_cat(const char *, const char *);
184 int kex_assemble_names(const char *, char **);
185 
186 int kex_new(struct ssh *, char *[PROPOSAL_MAX], struct kex **);
187 int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
188 void kex_free_newkeys(struct newkeys *);
189 void kex_free(struct kex *);
190 
191 int kex_buf2prop(struct sshbuf *, int *, char ***);
192 int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
193 void kex_prop_free(char **);
194 
195 int kex_send_kexinit(struct ssh *);
196 int kex_input_kexinit(int, u_int32_t, void *);
197 int kex_input_ext_info(int, u_int32_t, void *);
198 int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
199 int kex_derive_keys_bn(struct ssh *, u_char *, u_int, const BIGNUM *);
200 int kex_send_newkeys(struct ssh *);
201 int kex_start_rekex(struct ssh *);
202 
203 int kexdh_client(struct ssh *);
204 int kexdh_server(struct ssh *);
205 int kexgex_client(struct ssh *);
206 int kexgex_server(struct ssh *);
207 int kexecdh_client(struct ssh *);
208 int kexecdh_server(struct ssh *);
209 int kexc25519_client(struct ssh *);
210 int kexc25519_server(struct ssh *);
211 
212 #ifdef GSSAPI
213 int kexgss_client(struct ssh *);
214 int kexgss_server(struct ssh *);
215 #endif
216 
217 int kex_dh_hash(int, const char *, const char *,
218  const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
219  const BIGNUM *, const BIGNUM *, const BIGNUM *, u_char *, size_t *);
220 
221 int kexgex_hash(int, const char *, const char *,
222  const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
223  int, int, int,
224  const BIGNUM *, const BIGNUM *, const BIGNUM *,
225  const BIGNUM *, const BIGNUM *,
226  u_char *, size_t *);
227 
228 int kex_ecdh_hash(int, const EC_GROUP *, const char *, const char *,
229  const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
230  const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char *, size_t *);
231 
232 int kex_c25519_hash(int, const char *, const char *,
233  const u_char *, size_t, const u_char *, size_t,
234  const u_char *, size_t, const u_char *, const u_char *,
235  const u_char *, size_t, u_char *, size_t *);
236 
237 void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
238  __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
239  __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
240 int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
241  const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
242  __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
243  __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
244 
245 int
246 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
247 
248 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
249 void dump_digest(char *, u_char *, int);
250 #endif
251 
252 #if !defined(WITH_OPENSSL) || !defined(OPENSSL_HAS_ECC)
253 # undef EC_KEY
254 # undef EC_GROUP
255 # undef EC_POINT
256 #endif
257 
258 #endif
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