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Comparing gvpe/src/connection.h (file contents):
Revision 1.28 by pcg, Sat Nov 10 05:14:22 2007 UTC vs.
Revision 1.40 by root, Fri Oct 11 04:07:24 2013 UTC

1/* 1/*
2 connection.h -- header for connection.C 2 connection.h -- header for connection.C
3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> 3 Copyright (C) 2003-2008,2013 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE. 5 This file is part of GVPE.
6 6
7 GVPE is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
8 it under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by the
9 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
10 (at your option) any later version. 10 option) any later version.
11 11
12 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful, but
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15 GNU General Public License for more details. 15 Public License for more details.
16 16
17 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License along
18 along with gvpe; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19
20 Additional permission under GNU GPL version 3 section 7
21
22 If you modify this Program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a modified
24 version of that library), containing parts covered by the terms of the
25 OpenSSL or SSLeay licenses, the licensors of this Program grant you
26 additional permission to convey the resulting work. Corresponding
27 Source for a non-source form of such a combination shall include the
28 source code for the parts of OpenSSL used as well as that of the
29 covered work.
20*/ 30*/
21 31
22#ifndef GVPE_CONNECTION_H__ 32#ifndef GVPE_CONNECTION_H__
23#define GVPE_CONNECTION_H__ 33#define GVPE_CONNECTION_H__
24 34
… …
27#include "global.h" 37#include "global.h"
28#include "conf.h" 38#include "conf.h"
29#include "sockinfo.h" 39#include "sockinfo.h"
30#include "util.h" 40#include "util.h"
31#include "device.h" 41#include "device.h"
42#include "curve25519.h"
43#include "iv_gen.h"
32 44
33struct vpn; 45struct vpn;
34 46
35// called after HUP etc. to (re-)initialize global data structures 47// called after HUP etc. to (re-)initialize global data structures
36void connection_init (); 48void connection_init ();
37 49
50typedef curve25519_key ecdh_key;
51
38struct rsaid { 52struct rsa_data
39 u8 id[RSA_IDLEN]; // the challenge id 53{
54 u32 seqno; // (ictx) initial sequence nr (31 bits)
55 u8 mac_key[MAC_IKMSIZE]; // (ictx) used to generate hmac key
56 u8 cipher_key[CIPHER_IKMSIZE]; // (ictx) used to generate cipher key
57 u8 hkdf_salt[HKDF_SALT]; // (octx) used as hkdf salt
58 u8 extra_auth[ // (ictx) additional auth randomness
59 (RSABITS >> 3)
60 - RSA_OAEP_SIZE
61 - sizeof (u32) // seqno
62 - MAC_IKMSIZE
63 - CIPHER_IKMSIZE
64 - HKDF_SALT
65 - 3 // struct alignment...
66 ];
40}; 67};
41 68
42typedef rsaclear rsachallenge; // challenge data; 69struct auth_data
43typedef rsacrypt rsaencrdata; // encrypted challenge 70{
44typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash 71 rsa_data rsa;
72 ecdh_key ecdh;
73};
74
75typedef u8 rsa_crypt[RSA_KEYLEN]; // encrypted challenge
76
77struct auth_encr
78{
79 rsa_crypt rsa;
80 ecdh_key ecdh;
81};
82
83typedef u8 auth_mac[AUTH_SIZE];
84
85struct auth_response
86{
87 auth_mac mac;
88 ecdh_key ecdh;
89};
45 90
46//////////////////////////////////////////////////////////////////////////////////////// 91////////////////////////////////////////////////////////////////////////////////////////
47 92
48struct crypto_ctx; 93struct crypto_ctx;
49 94
… …
53 98
54 void hmac_set (crypto_ctx * ctx); 99 void hmac_set (crypto_ctx * ctx);
55 bool hmac_chk (crypto_ctx * ctx); 100 bool hmac_chk (crypto_ctx * ctx);
56 101
57private: 102private:
58 static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
59
60 void hmac_gen (crypto_ctx * ctx); 103 void hmac_gen (crypto_ctx * ctx, u8 *hmac_digest);
61}; 104};
62 105
63struct vpn_packet : hmac_packet 106struct vpn_packet : hmac_packet
64 { 107{
65 enum ptype 108 enum ptype
66 { 109 {
67 PT_RESET = 0, 110 PT_RESET = 0,
68 PT_DATA_UNCOMPRESSED, 111 PT_DATA_UNCOMPRESSED,
69 PT_DATA_COMPRESSED, 112 PT_DATA_COMPRESSED,
70 PT_PING, PT_PONG, // wasting namespace space? ;) 113 PT_PING, PT_PONG, // wasting namespace space? ;)
71 PT_AUTH_REQ, // authentification request 114 PT_AUTH_REQ, // authentification request
72 PT_AUTH_RES, // authentification response 115 PT_AUTH_RES, // authentification response
73 PT_CONNECT_REQ, // want other node to contact me 116 PT_CONNECT_REQ, // want other node to contact me
74 PT_CONNECT_INFO, // request connection to some node 117 PT_CONNECT_INFO, // request connection to some node
75 PT_DATA_BRIDGED, // uncompressed packet with foreign mac pot. larger than path mtu 118 PT_DATA_BRIDGED, // uncompressed packet with foreign mac pot. larger than path mtu (NYI)
76 PT_MAX 119 PT_MAX
77 };
78
79 u8 type;
80 u8 srcdst, src1, dst1;
81
82 void set_hdr (ptype type_, unsigned int dst);
83
84 unsigned int src () const
85 {
86 return src1 | ((srcdst >> 4) << 8);
87 }
88
89 unsigned int dst () const
90 {
91 return dst1 | ((srcdst & 0xf) << 8);
92 }
93
94 ptype typ () const
95 {
96 return (ptype) type;
97 }
98 }; 120 };
121
122 u8 type;
123 u8 srcdst, src1, dst1;
124
125 void set_hdr (ptype type_, unsigned int dst);
126
127 unsigned int src () const
128 {
129 return src1 | ((srcdst >> 4) << 8);
130 }
131
132 unsigned int dst () const
133 {
134 return dst1 | ((srcdst & 0xf) << 8);
135 }
136
137 ptype typ () const
138 {
139 return (ptype) type;
140 }
141};
99 142
100//////////////////////////////////////////////////////////////////////////////////////// 143////////////////////////////////////////////////////////////////////////////////////////
101 144
102// a very simple fifo pkt-queue 145// a very simple fifo pkt-queue
103class pkt_queue 146class pkt_queue
104 { 147{
105 net_packet *queue[QUEUEDEPTH];
106 int i, j; 148 int i, j;
149 int max_queue;
150 double max_ttl;
107 151
152 struct pkt {
153 ev_tstamp tstamp;
154 net_packet *pkt;
155 } *queue;
156
157 void expire_cb (ev::timer &w, int revents); ev::timer expire;
158
108 public: 159public:
109 160
110 void put (net_packet *p); 161 void put (net_packet *p);
111 net_packet *get (); 162 net_packet *get ();
112 163
113 pkt_queue (); 164 bool empty ()
165 {
166 return i == j;
167 }
168
169 pkt_queue (double max_ttl, int max_queue);
114 ~pkt_queue (); 170 ~pkt_queue ();
115 }; 171};
116 172
117enum 173enum
118 { 174{
119 FEATURE_COMPRESSION = 0x01, 175 FEATURE_COMPRESSION = 0x01,
120 FEATURE_ROHC = 0x02, 176 FEATURE_ROHC = 0x02,
121 FEATURE_BRIDGING = 0x04, 177 FEATURE_BRIDGING = 0x04,
122 }; 178};
123 179
124struct connection 180struct connection
125 { 181{
126 conf_node *conf; 182 conf_node *conf;
127 struct vpn *vpn; 183 struct vpn *vpn;
128 184
129 sockinfo si; // the current(!) destination ip to send packets to 185 sockinfo si; // the current(!) destination ip to send packets to
130 int retry_cnt; 186 int retry_cnt;
131 187
132 tstamp last_activity; // time of last packet received 188 tstamp last_activity; // time of last packet received
189 tstamp last_establish_attempt;
190 //tstamp last_si_change; // time we last changed the socket address
133 191
134 u32 oseqno; 192 u32 oseqno;
135 sliding_window iseqno; 193 sliding_window iseqno;
136 194
137 u8 protocol; 195 u8 protocol;
138 u8 features; 196 u8 features;
139 197
140 pkt_queue data_queue, vpn_queue; 198 pkt_queue data_queue, vpn_queue;
141 199
142 crypto_ctx *octx, *ictx; 200 crypto_ctx *octx, *ictx;
201 iv_gen oiv; // generator for random byte prefix
202
203 void generate_auth_data ();
204
205 ev_tstamp auth_expire; // when the snd_* and *_ecdh values expire
206 ev_tstamp hmac_error; // time of first hmac error in a series
207
208 // send auth data - used for octx
209 auth_data snd_auth;
210 ecdh_key snd_ecdh_a; // the secret ecdh key we used for our request
211 ecdh_key snd_ecdh_b; // the public ecdh key we received in the response
212 bool have_snd_auth; // received response for our req
213
214 // receive auth data - used for ictx
215 auth_data rcv_auth;
216 ecdh_key rcv_ecdh_a; // the secret ecdh key we used for our response
217 ecdh_key rcv_ecdh_b; // the public ecdh key we sent in our response
218 bool have_rcv_auth; // received auth from other side
143 219
144#if ENABLE_DNS 220#if ENABLE_DNS
145 struct dns_connection *dns; 221 struct dns_connection *dns;
146
147 void dnsv4_reset_connection ();
148#endif 222#endif
149 223
150 enum conf_node::connectmode connectmode; 224 enum conf_node::connectmode connectmode;
151 u8 prot_minor; // minor number of other side 225 u8 prot_minor; // minor number of other side
152 226
153 void reset_si (); 227 void reset_si ();
154 const sockinfo &forward_si (const sockinfo &si) const; 228 const sockinfo &forward_si (const sockinfo &si) const;
155 229
156 void shutdown (); 230 void shutdown ();
157 void connection_established (); 231 void connection_established (const sockinfo &rsi);
158 void reset_connection (); 232 void reset_connection (const char *reason);
159 233
160 void establish_connection_cb (ev::timer &w, int revents); ev::timer establish_connection; 234 void establish_connection_cb (ev::timer &w, int revents); ev::timer establish_connection;
161 void rekey_cb (ev::timer &w, int revents); ev::timer rekey; // next rekying (actually current reset + reestablishing) 235 void rekey_cb (ev::timer &w, int revents); ev::timer rekey; // next rekeying (actually current reset + reestablishing)
162 void keepalive_cb (ev::timer &w, int revents); ev::timer keepalive; // next keepalive probe 236 void keepalive_cb (ev::timer &w, int revents); ev::timer keepalive; // next keepalive probe
163 237
164 void send_connect_request (int id); 238 void send_connect_request (int id);
165 void send_auth_request (const sockinfo &si, bool initiate); 239 void send_auth_request (const sockinfo &si, bool initiate);
166 void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg); 240 void send_auth_response (const sockinfo &si);
167 void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols); 241 void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
168 void send_reset (const sockinfo &dsi); 242 void send_reset (const sockinfo &dsi);
169 void send_ping (const sockinfo &dsi, u8 pong = 0); 243 void send_ping (const sockinfo &dsi, u8 pong = 0);
170 void send_data_packet (tap_packet *pkt); 244 void send_data_packet (tap_packet *pkt);
171 245
246 void post_inject_queue ();
172 void inject_data_packet (tap_packet *pkt, bool broadcast = false); 247 void inject_data_packet (tap_packet *pkt);
173 void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding 248 void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding
174 249
175 void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi); 250 void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
176 void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0); 251 void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
177 252
178 void script_init_env (const char *ext); 253 void script_init_env (const char *ext);
179 void script_init_connect_env (); 254 void script_init_connect_env ();
180 const char *script_node_up (); 255 const char *script_node_up ();
256 const char *script_node_change ();
181 const char *script_node_down (); 257 const char *script_node_down ();
182 258
183 void dump_status (); 259 void dump_status ();
184 260
185 connection (struct vpn *vpn, conf_node *conf); 261 connection (struct vpn *vpn, conf_node *conf);
186 ~connection (); 262 ~connection ();
187 }; 263};
188 264
189#endif 265#endif
190 266

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