1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
|
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | 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, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | 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 |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "config.h" |
22 | #include "config.h" |
21 | |
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|
22 | extern "C" { |
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23 | # include "lzf/lzf.h" |
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24 | } |
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25 | |
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26 | #include <cassert> |
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27 | |
23 | |
28 | #include <list> |
24 | #include <list> |
29 | |
25 | |
30 | #include <openssl/rand.h> |
26 | #include <openssl/rand.h> |
31 | #include <openssl/evp.h> |
27 | #include <openssl/evp.h> |
32 | #include <openssl/rsa.h> |
28 | #include <openssl/rsa.h> |
33 | #include <openssl/err.h> |
29 | #include <openssl/err.h> |
34 | |
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|
35 | #include "gettext.h" |
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36 | |
30 | |
37 | #include "conf.h" |
31 | #include "conf.h" |
38 | #include "slog.h" |
32 | #include "slog.h" |
39 | #include "device.h" |
33 | #include "device.h" |
40 | #include "vpn.h" |
34 | #include "vpn.h" |
… | |
… | |
46 | # define RAND_pseudo_bytes RAND_bytes |
40 | # define RAND_pseudo_bytes RAND_bytes |
47 | #endif |
41 | #endif |
48 | |
42 | |
49 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
43 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
50 | |
44 | |
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|
45 | #define ULTRA_FAST 1 |
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46 | #define HLOG 15 |
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47 | #include "lzf/lzf.h" |
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48 | #include "lzf/lzf_c.c" |
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49 | #include "lzf/lzf_d.c" |
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50 | |
51 | struct crypto_ctx |
51 | struct crypto_ctx |
52 | { |
52 | { |
53 | EVP_CIPHER_CTX cctx; |
53 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
54 | HMAC_CTX hctx; |
55 | |
55 | |
… | |
… | |
58 | }; |
58 | }; |
59 | |
59 | |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
61 | { |
61 | { |
62 | EVP_CIPHER_CTX_init (&cctx); |
62 | EVP_CIPHER_CTX_init (&cctx); |
63 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
63 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
64 | HMAC_CTX_init (&hctx); |
64 | HMAC_CTX_init (&hctx); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
66 | } |
66 | } |
67 | |
67 | |
68 | crypto_ctx::~crypto_ctx () |
68 | crypto_ctx::~crypto_ctx () |
69 | { |
69 | { |
70 | EVP_CIPHER_CTX_cleanup (&cctx); |
70 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
71 | HMAC_CTX_cleanup (&hctx); |
71 | HMAC_CTX_cleanup (&hctx); |
72 | } |
72 | } |
73 | |
73 | |
74 | static void |
74 | static void |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
76 | { |
76 | { |
77 | EVP_MD_CTX ctx; |
77 | EVP_MD_CTX ctx; |
78 | |
78 | |
79 | EVP_MD_CTX_init (&ctx); |
79 | EVP_MD_CTX_init (&ctx); |
80 | EVP_DigestInit (&ctx, RSA_HASH); |
80 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
81 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
81 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
82 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
83 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
84 | EVP_MD_CTX_cleanup (&ctx); |
84 | EVP_MD_CTX_cleanup (&ctx); |
85 | } |
85 | } |
86 | |
86 | |
87 | struct rsa_entry { |
87 | struct rsa_entry |
|
|
88 | { |
88 | tstamp expire; |
89 | tstamp expire; |
89 | rsaid id; |
90 | rsaid id; |
90 | rsachallenge chg; |
91 | rsachallenge chg; |
91 | }; |
92 | }; |
92 | |
93 | |
93 | struct rsa_cache : list<rsa_entry> |
94 | struct rsa_cache : list<rsa_entry> |
94 | { |
95 | { |
95 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
96 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
96 | |
97 | |
97 | bool find (const rsaid &id, rsachallenge &chg) |
98 | bool find (const rsaid &id, rsachallenge &chg) |
98 | { |
99 | { |
99 | for (iterator i = begin (); i != end (); ++i) |
100 | for (iterator i = begin (); i != end (); ++i) |
100 | { |
101 | { |
101 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
102 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
102 | { |
103 | { |
103 | memcpy (&chg, &i->chg, sizeof chg); |
104 | memcpy (&chg, &i->chg, sizeof chg); |
104 | |
105 | |
105 | erase (i); |
106 | erase (i); |
106 | return true; |
107 | return true; |
107 | } |
108 | } |
108 | } |
109 | } |
109 | |
110 | |
110 | if (cleaner.at < NOW) |
111 | if (!cleaner.is_active ()) |
111 | cleaner.start (NOW + RSA_TTL); |
112 | cleaner.again (); |
112 | |
113 | |
113 | return false; |
114 | return false; |
114 | } |
115 | } |
115 | |
116 | |
116 | void gen (rsaid &id, rsachallenge &chg) |
117 | void gen (rsaid &id, rsachallenge &chg) |
117 | { |
118 | { |
118 | rsa_entry e; |
119 | rsa_entry e; |
119 | |
120 | |
120 | RAND_bytes ((unsigned char *)&id, sizeof id); |
121 | RAND_bytes ((unsigned char *)&id, sizeof id); |
121 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
122 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
122 | |
123 | |
123 | e.expire = NOW + RSA_TTL; |
124 | e.expire = ev_now () + RSA_TTL; |
124 | e.id = id; |
125 | e.id = id; |
125 | memcpy (&e.chg, &chg, sizeof chg); |
126 | memcpy (&e.chg, &chg, sizeof chg); |
126 | |
127 | |
127 | push_back (e); |
128 | push_back (e); |
128 | |
129 | |
129 | if (cleaner.at < NOW) |
130 | if (!cleaner.is_active ()) |
130 | cleaner.start (NOW + RSA_TTL); |
131 | cleaner.again (); |
131 | } |
132 | } |
132 | |
133 | |
133 | rsa_cache () |
134 | rsa_cache () |
134 | : cleaner (this, &rsa_cache::cleaner_cb) |
135 | { |
135 | { } |
136 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
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137 | cleaner.set (RSA_TTL, RSA_TTL); |
|
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138 | } |
136 | |
139 | |
137 | } rsa_cache; |
140 | } rsa_cache; |
138 | |
141 | |
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
142 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
140 | { |
143 | { |
141 | if (!empty ()) |
144 | if (empty ()) |
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145 | w.stop (); |
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146 | else |
142 | { |
147 | { |
143 | w.start (NOW + RSA_TTL); |
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144 | |
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145 | for (iterator i = begin (); i != end (); ) |
148 | for (iterator i = begin (); i != end (); ) |
146 | if (i->expire <= NOW) |
149 | if (i->expire <= ev_now ()) |
147 | i = erase (i); |
150 | i = erase (i); |
148 | else |
151 | else |
149 | ++i; |
152 | ++i; |
150 | } |
153 | } |
151 | } |
154 | } |
152 | |
155 | |
153 | ////////////////////////////////////////////////////////////////////////////// |
156 | ////////////////////////////////////////////////////////////////////////////// |
154 | |
157 | |
155 | void pkt_queue::put (net_packet *p) |
158 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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159 | : max_ttl (max_ttl), max_queue (max_queue) |
156 | { |
160 | { |
157 | if (queue[i]) |
161 | queue = new pkt [max_queue]; |
158 | { |
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159 | delete queue[i]; |
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160 | j = (j + 1) % QUEUEDEPTH; |
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161 | } |
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162 | |
162 | |
163 | queue[i] = p; |
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164 | |
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165 | i = (i + 1) % QUEUEDEPTH; |
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166 | } |
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167 | |
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168 | net_packet *pkt_queue::get () |
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169 | { |
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170 | net_packet *p = queue[j]; |
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171 | |
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172 | if (p) |
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173 | { |
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174 | queue[j] = 0; |
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175 | j = (j + 1) % QUEUEDEPTH; |
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176 | } |
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177 | |
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178 | return p; |
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179 | } |
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180 | |
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181 | pkt_queue::pkt_queue () |
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182 | { |
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183 | memset (queue, 0, sizeof (queue)); |
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184 | i = 0; |
163 | i = 0; |
185 | j = 0; |
164 | j = 0; |
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165 | |
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166 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
186 | } |
167 | } |
187 | |
168 | |
188 | pkt_queue::~pkt_queue () |
169 | pkt_queue::~pkt_queue () |
189 | { |
170 | { |
190 | for (i = QUEUEDEPTH; --i > 0; ) |
171 | while (net_packet *p = get ()) |
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172 | delete p; |
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173 | |
191 | delete queue[i]; |
174 | delete [] queue; |
192 | } |
175 | } |
193 | |
176 | |
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177 | void pkt_queue::expire_cb (ev::timer &w, int revents) |
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178 | { |
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179 | ev_tstamp expire = ev_now () - max_ttl; |
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180 | |
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181 | for (;;) |
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182 | { |
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183 | if (empty ()) |
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184 | break; |
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185 | |
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186 | double diff = queue[j].tstamp - expire; |
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187 | |
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188 | if (diff >= 0.) |
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189 | { |
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190 | w.start (diff > 0.5 ? diff : 0.5); |
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191 | break; |
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192 | } |
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193 | |
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194 | delete get (); |
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195 | } |
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196 | } |
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197 | |
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198 | void pkt_queue::put (net_packet *p) |
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199 | { |
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200 | ev_tstamp now = ev_now (); |
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201 | |
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202 | // start expiry timer |
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203 | if (empty ()) |
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204 | expire.start (max_ttl); |
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205 | |
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206 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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207 | |
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208 | if (ni == j) |
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209 | delete get (); |
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210 | |
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211 | queue[i].pkt = p; |
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212 | queue[i].tstamp = now; |
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213 | |
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214 | i = ni; |
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215 | } |
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216 | |
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217 | net_packet *pkt_queue::get () |
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218 | { |
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219 | if (empty ()) |
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220 | return 0; |
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221 | |
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222 | net_packet *p = queue[j].pkt; |
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223 | queue[j].pkt = 0; |
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224 | |
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225 | j = j + 1 == max_queue ? 0 : j + 1; |
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226 | |
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227 | return p; |
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228 | } |
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229 | |
194 | struct net_rateinfo { |
230 | struct net_rateinfo |
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231 | { |
195 | u32 host; |
232 | u32 host; |
196 | double pcnt, diff; |
233 | double pcnt, diff; |
197 | tstamp last; |
234 | tstamp last; |
198 | }; |
235 | }; |
199 | |
236 | |
200 | // only do action once every x seconds per host whole allowing bursts. |
237 | // only do action once every x seconds per host whole allowing bursts. |
201 | // this implementation ("splay list" ;) is inefficient, |
238 | // this implementation ("splay list" ;) is inefficient, |
202 | // but low on resources. |
239 | // but low on resources. |
203 | struct net_rate_limiter : list<net_rateinfo> |
240 | struct net_rate_limiter : list<net_rateinfo> |
204 | { |
241 | { |
205 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
242 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
206 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
243 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
207 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
244 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
208 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
245 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
209 | |
246 | |
210 | bool can (const sockinfo &si) { return can((u32)si.host); } |
247 | bool can (const sockinfo &si) { return can((u32)si.host); } |
211 | bool can (u32 host); |
248 | bool can (u32 host); |
212 | }; |
249 | }; |
213 | |
250 | |
… | |
… | |
218 | iterator i; |
255 | iterator i; |
219 | |
256 | |
220 | for (i = begin (); i != end (); ) |
257 | for (i = begin (); i != end (); ) |
221 | if (i->host == host) |
258 | if (i->host == host) |
222 | break; |
259 | break; |
223 | else if (i->last < NOW - EXPIRE) |
260 | else if (i->last < ev_now () - NRL_EXPIRE) |
224 | i = erase (i); |
261 | i = erase (i); |
225 | else |
262 | else |
226 | i++; |
263 | i++; |
227 | |
264 | |
228 | if (i == end ()) |
265 | if (i == end ()) |
229 | { |
266 | { |
230 | net_rateinfo ri; |
267 | net_rateinfo ri; |
231 | |
268 | |
232 | ri.host = host; |
269 | ri.host = host; |
233 | ri.pcnt = 1.; |
270 | ri.pcnt = 1.; |
234 | ri.diff = MAXDIF; |
271 | ri.diff = NRL_MAXDIF; |
235 | ri.last = NOW; |
272 | ri.last = ev_now (); |
236 | |
273 | |
237 | push_front (ri); |
274 | push_front (ri); |
238 | |
275 | |
239 | return true; |
276 | return true; |
240 | } |
277 | } |
241 | else |
278 | else |
242 | { |
279 | { |
243 | net_rateinfo ri (*i); |
280 | net_rateinfo ri (*i); |
244 | erase (i); |
281 | erase (i); |
245 | |
282 | |
246 | ri.pcnt = ri.pcnt * ALPHA; |
283 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
247 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
284 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
248 | |
285 | |
249 | ri.last = NOW; |
286 | ri.last = ev_now (); |
250 | |
287 | |
251 | double dif = ri.diff / ri.pcnt; |
288 | double dif = ri.diff / ri.pcnt; |
252 | |
289 | |
253 | bool send = dif > CUTOFF; |
290 | bool send = dif > NRL_CUTOFF; |
254 | |
291 | |
255 | if (dif > MAXDIF) |
292 | if (dif > NRL_MAXDIF) |
256 | { |
293 | { |
257 | ri.pcnt = 1.; |
294 | ri.pcnt = 1.; |
258 | ri.diff = MAXDIF; |
295 | ri.diff = NRL_MAXDIF; |
259 | } |
296 | } |
260 | else if (send) |
297 | else if (send) |
261 | ri.pcnt++; |
298 | ri.pcnt++; |
262 | |
299 | |
263 | push_front (ri); |
300 | push_front (ri); |
… | |
… | |
333 | int outl = 0, outl2; |
370 | int outl = 0, outl2; |
334 | ptype type = PT_DATA_UNCOMPRESSED; |
371 | ptype type = PT_DATA_UNCOMPRESSED; |
335 | |
372 | |
336 | #if ENABLE_COMPRESSION |
373 | #if ENABLE_COMPRESSION |
337 | u8 cdata[MAX_MTU]; |
374 | u8 cdata[MAX_MTU]; |
338 | u32 cl; |
|
|
339 | |
375 | |
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376 | if (conn->features & ENABLE_COMPRESSION) |
|
|
377 | { |
340 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
378 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
379 | |
341 | if (cl) |
380 | if (cl) |
342 | { |
381 | { |
343 | type = PT_DATA_COMPRESSED; |
382 | type = PT_DATA_COMPRESSED; |
344 | d = cdata; |
383 | d = cdata; |
345 | l = cl + 2; |
384 | l = cl + 2; |
346 | |
385 | |
347 | d[0] = cl >> 8; |
386 | d[0] = cl >> 8; |
348 | d[1] = cl; |
387 | d[1] = cl; |
|
|
388 | } |
349 | } |
389 | } |
350 | #endif |
390 | #endif |
351 | |
391 | |
352 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
392 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
353 | |
393 | |
354 | struct { |
394 | struct { |
355 | #if RAND_SIZE |
395 | #if RAND_SIZE |
356 | u8 rnd[RAND_SIZE]; |
396 | u8 rnd[RAND_SIZE]; |
357 | #endif |
397 | #endif |
… | |
… | |
361 | datahdr.seqno = ntohl (seqno); |
401 | datahdr.seqno = ntohl (seqno); |
362 | #if RAND_SIZE |
402 | #if RAND_SIZE |
363 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
403 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
364 | #endif |
404 | #endif |
365 | |
405 | |
366 | EVP_EncryptUpdate (cctx, |
406 | require (EVP_EncryptUpdate (cctx, |
367 | (unsigned char *) data + outl, &outl2, |
407 | (unsigned char *) data + outl, &outl2, |
368 | (unsigned char *) &datahdr, DATAHDR); |
408 | (unsigned char *) &datahdr, DATAHDR)); |
369 | outl += outl2; |
409 | outl += outl2; |
370 | |
410 | |
371 | EVP_EncryptUpdate (cctx, |
411 | require (EVP_EncryptUpdate (cctx, |
372 | (unsigned char *) data + outl, &outl2, |
412 | (unsigned char *) data + outl, &outl2, |
373 | (unsigned char *) d, l); |
413 | (unsigned char *) d, l)); |
374 | outl += outl2; |
414 | outl += outl2; |
375 | |
415 | |
376 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
416 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
377 | outl += outl2; |
417 | outl += outl2; |
378 | |
418 | |
379 | len = outl + data_hdr_size (); |
419 | len = outl + data_hdr_size (); |
380 | |
420 | |
381 | set_hdr (type, dst); |
421 | set_hdr (type, dst); |
… | |
… | |
390 | int outl = 0, outl2; |
430 | int outl = 0, outl2; |
391 | tap_packet *p = new tap_packet; |
431 | tap_packet *p = new tap_packet; |
392 | u8 *d; |
432 | u8 *d; |
393 | u32 l = len - data_hdr_size (); |
433 | u32 l = len - data_hdr_size (); |
394 | |
434 | |
395 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
435 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
396 | |
436 | |
397 | #if ENABLE_COMPRESSION |
437 | #if ENABLE_COMPRESSION |
398 | u8 cdata[MAX_MTU]; |
438 | u8 cdata[MAX_MTU]; |
399 | |
439 | |
400 | if (type == PT_DATA_COMPRESSED) |
440 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
402 | else |
442 | else |
403 | #endif |
443 | #endif |
404 | d = &(*p)[6 + 6 - DATAHDR]; |
444 | d = &(*p)[6 + 6 - DATAHDR]; |
405 | |
445 | |
406 | /* this overwrites part of the src mac, but we fix that later */ |
446 | /* this overwrites part of the src mac, but we fix that later */ |
407 | EVP_DecryptUpdate (cctx, |
447 | require (EVP_DecryptUpdate (cctx, |
408 | d, &outl2, |
448 | d, &outl2, |
409 | (unsigned char *)&data, len - data_hdr_size ()); |
449 | (unsigned char *)&data, len - data_hdr_size ())); |
410 | outl += outl2; |
450 | outl += outl2; |
411 | |
451 | |
412 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
452 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
413 | outl += outl2; |
453 | outl += outl2; |
414 | |
454 | |
415 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
455 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
416 | |
456 | |
417 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
457 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
446 | { |
486 | { |
447 | // actually, hmaclen cannot be checked because the hmac |
487 | // actually, hmaclen cannot be checked because the hmac |
448 | // field comes before this data, so peers with other |
488 | // field comes before this data, so peers with other |
449 | // hmacs simply will not work. |
489 | // hmacs simply will not work. |
450 | u8 prot_major, prot_minor, randsize, hmaclen; |
490 | u8 prot_major, prot_minor, randsize, hmaclen; |
451 | u8 flags, challengelen, pad2, pad3; |
491 | u8 flags, challengelen, features, pad3; |
452 | u32 cipher_nid, digest_nid, hmac_nid; |
492 | u32 cipher_nid, digest_nid, hmac_nid; |
453 | |
|
|
454 | const u8 curflags () const |
|
|
455 | { |
|
|
456 | return 0x80 |
|
|
457 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
458 | } |
|
|
459 | |
493 | |
460 | void setup (ptype type, int dst); |
494 | void setup (ptype type, int dst); |
461 | bool chk_config () const; |
495 | bool chk_config () const; |
|
|
496 | |
|
|
497 | static u8 get_features () |
|
|
498 | { |
|
|
499 | u8 f = 0; |
|
|
500 | #if ENABLE_COMPRESSION |
|
|
501 | f |= FEATURE_COMPRESSION; |
|
|
502 | #endif |
|
|
503 | #if ENABLE_ROHC |
|
|
504 | f |= FEATURE_ROHC; |
|
|
505 | #endif |
|
|
506 | #if ENABLE_BRIDGING |
|
|
507 | f |= FEATURE_BRIDGING; |
|
|
508 | #endif |
|
|
509 | return f; |
|
|
510 | } |
462 | }; |
511 | }; |
463 | |
512 | |
464 | void config_packet::setup (ptype type, int dst) |
513 | void config_packet::setup (ptype type, int dst) |
465 | { |
514 | { |
466 | prot_major = PROTOCOL_MAJOR; |
515 | prot_major = PROTOCOL_MAJOR; |
467 | prot_minor = PROTOCOL_MINOR; |
516 | prot_minor = PROTOCOL_MINOR; |
468 | randsize = RAND_SIZE; |
517 | randsize = RAND_SIZE; |
469 | hmaclen = HMACLENGTH; |
518 | hmaclen = HMACLENGTH; |
470 | flags = curflags (); |
519 | flags = 0; |
471 | challengelen = sizeof (rsachallenge); |
520 | challengelen = sizeof (rsachallenge); |
|
|
521 | features = get_features (); |
472 | |
522 | |
473 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
523 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
474 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
524 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
475 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
525 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
476 | |
526 | |
… | |
… | |
484 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
534 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
485 | else if (randsize != RAND_SIZE) |
535 | else if (randsize != RAND_SIZE) |
486 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
536 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
487 | else if (hmaclen != HMACLENGTH) |
537 | else if (hmaclen != HMACLENGTH) |
488 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
538 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
489 | else if (flags != curflags ()) |
|
|
490 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
491 | else if (challengelen != sizeof (rsachallenge)) |
539 | else if (challengelen != sizeof (rsachallenge)) |
492 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
540 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
541 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
494 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
542 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
495 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
543 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
… | |
… | |
571 | ///////////////////////////////////////////////////////////////////////////// |
619 | ///////////////////////////////////////////////////////////////////////////// |
572 | |
620 | |
573 | void |
621 | void |
574 | connection::connection_established () |
622 | connection::connection_established () |
575 | { |
623 | { |
|
|
624 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
|
|
625 | |
576 | if (ictx && octx) |
626 | if (ictx && octx) |
577 | { |
627 | { |
578 | connectmode = conf->connectmode; |
628 | // make sure rekeying timeouts are slightly asymmetric |
579 | |
629 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
580 | rekey.start (NOW + ::conf.rekey); |
630 | rekey.start (rekey_interval, rekey_interval); |
581 | keepalive.start (NOW + ::conf.keepalive); |
631 | keepalive.start (::conf.keepalive); |
582 | |
632 | |
583 | // send queued packets |
633 | // send queued packets |
584 | if (ictx && octx) |
634 | if (ictx && octx) |
585 | { |
635 | { |
586 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
636 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
587 | { |
637 | { |
588 | send_data_packet (p); |
638 | if (p->len) send_data_packet (p); |
589 | delete p; |
639 | delete p; |
590 | } |
640 | } |
591 | |
641 | |
592 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
642 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
593 | { |
643 | { |
594 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
644 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
595 | delete p; |
645 | delete p; |
596 | } |
646 | } |
597 | } |
647 | } |
598 | } |
648 | } |
599 | else |
649 | else |
600 | { |
650 | { |
601 | retry_cnt = 0; |
651 | retry_cnt = 0; |
602 | establish_connection.start (NOW + 5); |
652 | establish_connection.start (5); |
603 | keepalive.stop (); |
653 | keepalive.stop (); |
604 | rekey.stop (); |
654 | rekey.stop (); |
605 | } |
655 | } |
606 | } |
656 | } |
607 | |
657 | |
… | |
… | |
611 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
661 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
612 | |
662 | |
613 | // mask out protocols we cannot establish |
663 | // mask out protocols we cannot establish |
614 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
664 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
615 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
665 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
666 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
667 | |
|
|
668 | if (protocol |
|
|
669 | && (!conf->can_direct (THISNODE) |
|
|
670 | || !THISNODE->can_direct (conf))) |
|
|
671 | { |
|
|
672 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
|
|
673 | protocol = 0; |
|
|
674 | } |
616 | |
675 | |
617 | si.set (conf, protocol); |
676 | si.set (conf, protocol); |
618 | } |
677 | } |
619 | |
678 | |
620 | // ensure sockinfo is valid, forward if necessary |
679 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
625 | { |
684 | { |
626 | connection *r = vpn->find_router (); |
685 | connection *r = vpn->find_router (); |
627 | |
686 | |
628 | if (r) |
687 | if (r) |
629 | { |
688 | { |
630 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
689 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
631 | conf->nodename, r->conf->nodename); |
690 | conf->nodename, r->conf->nodename, (const char *)r->si); |
632 | return r->si; |
691 | return r->si; |
633 | } |
692 | } |
634 | else |
693 | else |
635 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
694 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
636 | conf->nodename); |
695 | conf->nodename); |
… | |
… | |
706 | } |
765 | } |
707 | |
766 | |
708 | void |
767 | void |
709 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
768 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
710 | { |
769 | { |
711 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
770 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
712 | conf->id, rid, (const char *)rsi); |
771 | conf->id, rid, (const char *)rsi); |
713 | |
772 | |
714 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
773 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
715 | |
774 | |
716 | r->hmac_set (octx); |
775 | r->hmac_set (octx); |
717 | send_vpn_packet (r, si); |
776 | send_vpn_packet (r, si); |
718 | |
777 | |
719 | delete r; |
778 | delete r; |
720 | } |
779 | } |
721 | |
780 | |
722 | void |
781 | inline void |
723 | connection::establish_connection_cb (time_watcher &w) |
782 | connection::establish_connection_cb (ev::timer &w, int revents) |
724 | { |
783 | { |
725 | if (!ictx |
784 | if (!ictx |
726 | && conf != THISNODE |
785 | && conf != THISNODE |
727 | && connectmode != conf_node::C_NEVER |
786 | && connectmode != conf_node::C_NEVER |
728 | && connectmode != conf_node::C_DISABLED |
787 | && connectmode != conf_node::C_DISABLED |
729 | && NOW > w.at) |
788 | && !w.is_active ()) |
730 | { |
789 | { |
731 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
790 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
732 | |
791 | // and stop trying. should probably be handled by a per-connection expire handler. |
733 | if (retry_int < 3600 * 8) |
792 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
793 | { |
|
|
794 | reset_connection (); |
734 | retry_cnt++; |
795 | return; |
|
|
796 | } |
735 | |
797 | |
736 | w.start (NOW + retry_int); |
798 | last_establish_attempt = ev_now (); |
|
|
799 | |
|
|
800 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
|
|
801 | ? (retry_cnt & 3) + 1 |
|
|
802 | : 1 << (retry_cnt >> 2)); |
737 | |
803 | |
738 | reset_si (); |
804 | reset_si (); |
739 | |
805 | |
|
|
806 | bool slow = si.prot & PROT_SLOW; |
|
|
807 | |
740 | if (si.prot && !si.host) |
808 | if (si.prot && !si.host) |
|
|
809 | { |
|
|
810 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
811 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
812 | w.start (1); |
741 | vpn->send_connect_request (conf->id); |
813 | vpn->send_connect_request (conf->id); |
|
|
814 | } |
742 | else |
815 | else |
743 | { |
816 | { |
|
|
817 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
|
|
818 | |
744 | const sockinfo &dsi = forward_si (si); |
819 | const sockinfo &dsi = forward_si (si); |
|
|
820 | |
|
|
821 | slow = slow || (dsi.prot & PROT_SLOW); |
745 | |
822 | |
746 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
823 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
747 | { |
824 | { |
748 | if (retry_cnt < 4) |
825 | if (retry_cnt < 4) |
749 | send_auth_request (dsi, true); |
826 | send_auth_request (dsi, true); |
750 | else |
827 | else |
751 | send_ping (dsi, 0); |
828 | send_ping (dsi, 0); |
752 | } |
829 | } |
753 | } |
830 | } |
|
|
831 | |
|
|
832 | retry_int *= slow ? 8. : 0.9; |
|
|
833 | |
|
|
834 | if (retry_int < conf->max_retry) |
|
|
835 | retry_cnt++; |
|
|
836 | else |
|
|
837 | retry_int = conf->max_retry; |
|
|
838 | |
|
|
839 | w.start (retry_int); |
754 | } |
840 | } |
755 | } |
841 | } |
756 | |
842 | |
757 | void |
843 | void |
758 | connection::reset_connection () |
844 | connection::reset_connection () |
… | |
… | |
761 | { |
847 | { |
762 | slog (L_INFO, _("%s(%s): connection lost"), |
848 | slog (L_INFO, _("%s(%s): connection lost"), |
763 | conf->nodename, (const char *)si); |
849 | conf->nodename, (const char *)si); |
764 | |
850 | |
765 | if (::conf.script_node_down) |
851 | if (::conf.script_node_down) |
766 | run_script (run_script_cb (this, &connection::script_node_down), false); |
852 | { |
|
|
853 | run_script_cb cb; |
|
|
854 | cb.set<connection, &connection::script_node_down> (this); |
|
|
855 | if (!run_script (cb, false)) |
|
|
856 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
|
|
857 | } |
767 | } |
858 | } |
768 | |
859 | |
769 | delete ictx; ictx = 0; |
860 | delete ictx; ictx = 0; |
770 | delete octx; octx = 0; |
861 | delete octx; octx = 0; |
|
|
862 | #if ENABLE_DNS |
|
|
863 | dnsv4_reset_connection (); |
|
|
864 | #endif |
771 | |
865 | |
772 | si.host= 0; |
866 | si.host = 0; |
773 | |
867 | |
774 | last_activity = 0; |
868 | last_activity = 0; |
775 | retry_cnt = 0; |
869 | retry_cnt = 0; |
776 | |
870 | |
777 | rekey.stop (); |
871 | rekey.stop (); |
… | |
… | |
786 | send_reset (si); |
880 | send_reset (si); |
787 | |
881 | |
788 | reset_connection (); |
882 | reset_connection (); |
789 | } |
883 | } |
790 | |
884 | |
791 | void |
885 | inline void |
792 | connection::rekey_cb (time_watcher &w) |
886 | connection::rekey_cb (ev::timer &w, int revents) |
793 | { |
887 | { |
794 | reset_connection (); |
888 | reset_connection (); |
795 | establish_connection (); |
889 | establish_connection (); |
796 | } |
890 | } |
797 | |
891 | |
… | |
… | |
813 | if (oseqno > MAX_SEQNO) |
907 | if (oseqno > MAX_SEQNO) |
814 | rekey (); |
908 | rekey (); |
815 | } |
909 | } |
816 | |
910 | |
817 | void |
911 | void |
|
|
912 | connection::post_inject_queue () |
|
|
913 | { |
|
|
914 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
915 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
916 | establish_connection.stop (); |
|
|
917 | |
|
|
918 | establish_connection (); |
|
|
919 | } |
|
|
920 | |
|
|
921 | void |
818 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
922 | connection::inject_data_packet (tap_packet *pkt) |
819 | { |
923 | { |
820 | if (ictx && octx) |
924 | if (ictx && octx) |
821 | send_data_packet (pkt); |
925 | send_data_packet (pkt); |
822 | else |
926 | else |
823 | { |
927 | { |
824 | if (!broadcast)//DDDD |
|
|
825 | data_queue.put (new tap_packet (*pkt)); |
928 | data_queue.put (new tap_packet (*pkt)); |
826 | |
929 | post_inject_queue (); |
827 | establish_connection (); |
|
|
828 | } |
930 | } |
829 | } |
931 | } |
830 | |
932 | |
831 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
933 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
832 | { |
934 | { |
833 | if (ictx && octx) |
935 | if (ictx && octx) |
834 | send_vpn_packet (pkt, si, tos); |
936 | send_vpn_packet (pkt, si, tos); |
835 | else |
937 | else |
836 | { |
938 | { |
837 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
939 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
838 | |
940 | post_inject_queue (); |
839 | establish_connection (); |
|
|
840 | } |
941 | } |
841 | } |
942 | } |
842 | |
943 | |
843 | void |
944 | void |
844 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
945 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
845 | { |
946 | { |
846 | last_activity = NOW; |
947 | last_activity = ev_now (); |
847 | |
948 | |
848 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
949 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
849 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
950 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
951 | |
|
|
952 | if (connectmode == conf_node::C_DISABLED) |
|
|
953 | return; |
850 | |
954 | |
851 | switch (pkt->typ ()) |
955 | switch (pkt->typ ()) |
852 | { |
956 | { |
853 | case vpn_packet::PT_PING: |
957 | case vpn_packet::PT_PING: |
854 | // we send pings instead of auth packets after some retries, |
958 | // we send pings instead of auth packets after some retries, |
… | |
… | |
915 | |
1019 | |
916 | octx = new crypto_ctx (k, 1); |
1020 | octx = new crypto_ctx (k, 1); |
917 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1021 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
918 | |
1022 | |
919 | conf->protocols = p->protocols; |
1023 | conf->protocols = p->protocols; |
|
|
1024 | features = p->features & config_packet::get_features (); |
920 | |
1025 | |
921 | send_auth_response (rsi, p->id, k); |
1026 | send_auth_response (rsi, p->id, k); |
922 | |
1027 | |
923 | connection_established (); |
1028 | connection_established (); |
924 | |
1029 | |
… | |
… | |
988 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1093 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
989 | conf->nodename, (const char *)rsi, |
1094 | conf->nodename, (const char *)rsi, |
990 | p->prot_major, p->prot_minor); |
1095 | p->prot_major, p->prot_minor); |
991 | |
1096 | |
992 | if (::conf.script_node_up) |
1097 | if (::conf.script_node_up) |
993 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1098 | { |
|
|
1099 | run_script_cb cb; |
|
|
1100 | cb.set<connection, &connection::script_node_up> (this); |
|
|
1101 | if (!run_script (cb, false)) |
|
|
1102 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
|
|
1103 | } |
994 | |
1104 | |
995 | break; |
1105 | break; |
996 | } |
1106 | } |
997 | else |
1107 | else |
998 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1108 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
1032 | { |
1142 | { |
1033 | vpn->tap->send (d); |
1143 | vpn->tap->send (d); |
1034 | |
1144 | |
1035 | if (si != rsi) |
1145 | if (si != rsi) |
1036 | { |
1146 | { |
1037 | // fast re-sync on connection changes, useful especially for tcp/ip |
1147 | // fast re-sync on source address changes, useful especially for tcp/ip |
1038 | si = rsi; |
1148 | si = rsi; |
1039 | |
1149 | |
1040 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1150 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1041 | conf->nodename, (const char *)si, (const char *)rsi); |
1151 | conf->nodename, (const char *)si, (const char *)rsi); |
1042 | } |
1152 | } |
1043 | |
|
|
1044 | delete d; |
|
|
1045 | |
|
|
1046 | break; |
|
|
1047 | } |
1153 | } |
|
|
1154 | |
|
|
1155 | delete d; |
|
|
1156 | break; |
1048 | } |
1157 | } |
1049 | } |
1158 | } |
1050 | |
1159 | |
1051 | send_reset (rsi); |
1160 | send_reset (rsi); |
1052 | break; |
1161 | break; |
… | |
… | |
1054 | case vpn_packet::PT_CONNECT_REQ: |
1163 | case vpn_packet::PT_CONNECT_REQ: |
1055 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1164 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1056 | { |
1165 | { |
1057 | connect_req_packet *p = (connect_req_packet *) pkt; |
1166 | connect_req_packet *p = (connect_req_packet *) pkt; |
1058 | |
1167 | |
1059 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1168 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1060 | connection *c = vpn->conns[p->id - 1]; |
|
|
1061 | conf->protocols = p->protocols; |
|
|
1062 | |
|
|
1063 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1064 | conf->id, p->id, c->ictx && c->octx); |
|
|
1065 | |
|
|
1066 | if (c->ictx && c->octx) |
|
|
1067 | { |
1169 | { |
|
|
1170 | connection *c = vpn->conns[p->id - 1]; |
|
|
1171 | conf->protocols = p->protocols; |
|
|
1172 | |
|
|
1173 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
|
|
1174 | conf->id, p->id, c->ictx && c->octx); |
|
|
1175 | |
|
|
1176 | if (c->ictx && c->octx) |
|
|
1177 | { |
1068 | // send connect_info packets to both sides, in case one is |
1178 | // send connect_info packets to both sides, in case one is |
1069 | // behind a nat firewall (or both ;) |
1179 | // behind a nat firewall (or both ;) |
1070 | c->send_connect_info (conf->id, si, conf->protocols); |
1180 | c->send_connect_info (conf->id, si, conf->protocols); |
1071 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1181 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1182 | } |
|
|
1183 | else |
|
|
1184 | c->establish_connection (); |
1072 | } |
1185 | } |
1073 | else |
1186 | else |
1074 | c->establish_connection (); |
1187 | slog (L_WARN, |
|
|
1188 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1189 | p->id); |
1075 | } |
1190 | } |
1076 | |
1191 | |
1077 | break; |
1192 | break; |
1078 | |
1193 | |
1079 | case vpn_packet::PT_CONNECT_INFO: |
1194 | case vpn_packet::PT_CONNECT_INFO: |
1080 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1195 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1081 | { |
1196 | { |
1082 | connect_info_packet *p = (connect_info_packet *) pkt; |
1197 | connect_info_packet *p = (connect_info_packet *)pkt; |
1083 | |
1198 | |
1084 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1199 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1085 | |
1200 | { |
1086 | connection *c = vpn->conns[p->id - 1]; |
1201 | connection *c = vpn->conns[p->id - 1]; |
1087 | |
1202 | |
1088 | c->conf->protocols = p->protocols; |
1203 | c->conf->protocols = p->protocols; |
1089 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1204 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1090 | p->si.upgrade_protocol (protocol, c->conf); |
1205 | p->si.upgrade_protocol (protocol, c->conf); |
1091 | |
1206 | |
1092 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1207 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1093 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1208 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1094 | |
1209 | |
1095 | const sockinfo &dsi = forward_si (p->si); |
1210 | const sockinfo &dsi = forward_si (p->si); |
1096 | |
1211 | |
1097 | if (dsi.valid ()) |
1212 | if (dsi.valid ()) |
1098 | c->send_auth_request (dsi, true); |
1213 | c->send_auth_request (dsi, true); |
|
|
1214 | } |
|
|
1215 | else |
|
|
1216 | slog (L_WARN, |
|
|
1217 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1218 | p->id); |
1099 | } |
1219 | } |
1100 | |
1220 | |
1101 | break; |
1221 | break; |
1102 | |
1222 | |
1103 | default: |
1223 | default: |
1104 | send_reset (rsi); |
1224 | send_reset (rsi); |
1105 | break; |
1225 | break; |
1106 | } |
1226 | } |
1107 | } |
1227 | } |
1108 | |
1228 | |
1109 | void connection::keepalive_cb (time_watcher &w) |
1229 | inline void |
|
|
1230 | connection::keepalive_cb (ev::timer &w, int revents) |
1110 | { |
1231 | { |
1111 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1232 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1112 | { |
1233 | { |
1113 | reset_connection (); |
1234 | reset_connection (); |
1114 | establish_connection (); |
1235 | establish_connection (); |
1115 | } |
1236 | } |
1116 | else if (NOW < last_activity + ::conf.keepalive) |
1237 | else if (ev_now () < last_activity + ::conf.keepalive) |
1117 | w.start (last_activity + ::conf.keepalive); |
1238 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1118 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1239 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1119 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1240 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1120 | { |
1241 | { |
1121 | send_ping (si); |
1242 | send_ping (si); |
1122 | w.start (NOW + 5); |
1243 | w.start (5); |
1123 | } |
1244 | } |
1124 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1245 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1125 | // hold ondemand connections implicitly a few seconds longer |
1246 | // hold ondemand connections implicitly a few seconds longer |
1126 | // should delete octx, though, or something like that ;) |
1247 | // should delete octx, though, or something like that ;) |
1127 | w.start (last_activity + ::conf.keepalive + 10); |
1248 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1128 | else |
1249 | else |
1129 | reset_connection (); |
1250 | reset_connection (); |
1130 | } |
1251 | } |
1131 | |
1252 | |
1132 | void connection::send_connect_request (int id) |
1253 | void connection::send_connect_request (int id) |
… | |
… | |
1138 | send_vpn_packet (p, si); |
1259 | send_vpn_packet (p, si); |
1139 | |
1260 | |
1140 | delete p; |
1261 | delete p; |
1141 | } |
1262 | } |
1142 | |
1263 | |
|
|
1264 | void connection::script_init_env (const char *ext) |
|
|
1265 | { |
|
|
1266 | char *env; |
|
|
1267 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1268 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1269 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1270 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1271 | conf->id & 0xff); putenv (env); |
|
|
1272 | } |
|
|
1273 | |
1143 | void connection::script_node () |
1274 | void connection::script_init_connect_env () |
1144 | { |
1275 | { |
1145 | vpn->script_if_up (); |
1276 | vpn->script_init_env (); |
1146 | |
1277 | |
1147 | char *env; |
1278 | char *env; |
1148 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1279 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1149 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1280 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1150 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1281 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1151 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1282 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1152 | } |
1283 | } |
1153 | |
1284 | |
|
|
1285 | inline const char * |
1154 | const char *connection::script_node_up () |
1286 | connection::script_node_up () |
1155 | { |
1287 | { |
1156 | script_node (); |
1288 | script_init_connect_env (); |
1157 | |
1289 | |
1158 | putenv ("STATE=up"); |
1290 | putenv ((char *)"STATE=up"); |
1159 | |
1291 | |
|
|
1292 | char *filename; |
|
|
1293 | asprintf (&filename, |
|
|
1294 | "%s/%s", |
|
|
1295 | confbase, |
1160 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1296 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1161 | } |
|
|
1162 | |
1297 | |
|
|
1298 | return filename; |
|
|
1299 | } |
|
|
1300 | |
|
|
1301 | inline const char * |
1163 | const char *connection::script_node_down () |
1302 | connection::script_node_down () |
1164 | { |
1303 | { |
1165 | script_node (); |
1304 | script_init_connect_env (); |
1166 | |
1305 | |
1167 | putenv ("STATE=down"); |
1306 | putenv ((char *)"STATE=down"); |
1168 | |
1307 | |
1169 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1308 | char *filename; |
1170 | } |
1309 | asprintf (&filename, |
|
|
1310 | "%s/%s", |
|
|
1311 | confbase, |
|
|
1312 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1171 | |
1313 | |
|
|
1314 | return filename; |
|
|
1315 | } |
|
|
1316 | |
1172 | connection::connection(struct vpn *vpn_) |
1317 | connection::connection (struct vpn *vpn, conf_node *conf) |
1173 | : vpn(vpn_) |
1318 | : vpn(vpn), conf(conf), |
1174 | , rekey (this, &connection::rekey_cb) |
1319 | #if ENABLE_DNS |
1175 | , keepalive (this, &connection::keepalive_cb) |
1320 | dns (0), |
|
|
1321 | #endif |
|
|
1322 | data_queue(conf->max_ttl, conf->max_queue), |
|
|
1323 | vpn_queue(conf->max_ttl, conf->max_queue) |
|
|
1324 | { |
|
|
1325 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1326 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1176 | , establish_connection (this, &connection::establish_connection_cb) |
1327 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1177 | { |
1328 | |
|
|
1329 | last_establish_attempt = 0.; |
1178 | octx = ictx = 0; |
1330 | octx = ictx = 0; |
1179 | retry_cnt = 0; |
|
|
1180 | |
1331 | |
1181 | connectmode = conf_node::C_ALWAYS; // initial setting |
1332 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1333 | conf->protocols = PROT_UDPv4; |
|
|
1334 | |
|
|
1335 | connectmode = conf->connectmode; |
|
|
1336 | |
|
|
1337 | // queue a dummy packet to force an initial connection attempt |
|
|
1338 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1339 | vpn_queue.put (new net_packet); |
|
|
1340 | |
1182 | reset_connection (); |
1341 | reset_connection (); |
1183 | } |
1342 | } |
1184 | |
1343 | |
1185 | connection::~connection () |
1344 | connection::~connection () |
1186 | { |
1345 | { |