1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008,2010,2011 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 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
25 | |
37 | |
26 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
27 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
28 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
29 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
… | |
… | |
38 | |
50 | |
39 | #if !HAVE_RAND_PSEUDO_BYTES |
51 | #if !HAVE_RAND_PSEUDO_BYTES |
40 | # define RAND_pseudo_bytes RAND_bytes |
52 | # define RAND_pseudo_bytes RAND_bytes |
41 | #endif |
53 | #endif |
42 | |
54 | |
43 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
55 | #define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol) |
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56 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated) |
44 | |
57 | |
45 | #define ULTRA_FAST 1 |
58 | #define ULTRA_FAST 1 |
46 | #define HLOG 15 |
59 | #define HLOG 15 |
47 | #include "lzf/lzf.h" |
60 | #include "lzf/lzf.h" |
48 | #include "lzf/lzf_c.c" |
61 | #include "lzf/lzf_c.c" |
49 | #include "lzf/lzf_d.c" |
62 | #include "lzf/lzf_d.c" |
50 | |
63 | |
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64 | ////////////////////////////////////////////////////////////////////////////// |
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65 | |
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66 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
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67 | static ev::child rs_child_ev; |
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68 | |
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69 | namespace |
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70 | { |
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71 | void // c++ requires external linkage here, apparently :( |
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72 | rs_child_cb (ev::child &w, int revents) |
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73 | { |
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74 | w.stop (); |
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75 | |
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76 | if (rs_queue.empty ()) |
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77 | return; |
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78 | |
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79 | pid_t pid = run_script (*rs_queue.front ().first, false); |
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80 | if (pid) |
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81 | { |
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82 | w.set (pid); |
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83 | w.start (); |
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84 | } |
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85 | else |
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86 | slog (L_WARN, rs_queue.front ().second); |
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87 | |
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88 | delete rs_queue.front ().first; |
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89 | rs_queue.pop (); |
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90 | } |
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91 | }; |
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92 | |
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93 | // despite the fancy name, this is quite a hack |
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94 | static void |
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95 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
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96 | { |
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97 | rs_queue.push (std::make_pair (cb, warnmsg)); |
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98 | |
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99 | if (!rs_child_ev.is_active ()) |
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100 | { |
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101 | rs_child_ev.set<rs_child_cb> (); |
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102 | rs_child_ev (); |
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103 | } |
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104 | } |
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105 | |
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106 | ////////////////////////////////////////////////////////////////////////////// |
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107 | |
51 | struct crypto_ctx |
108 | struct crypto_ctx |
52 | { |
109 | { |
53 | EVP_CIPHER_CTX cctx; |
110 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
111 | HMAC_CTX hctx; |
55 | |
112 | |
… | |
… | |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
132 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
76 | { |
133 | { |
77 | EVP_MD_CTX ctx; |
134 | EVP_MD_CTX ctx; |
78 | |
135 | |
79 | EVP_MD_CTX_init (&ctx); |
136 | EVP_MD_CTX_init (&ctx); |
80 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
137 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
81 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
138 | require (EVP_DigestUpdate (&ctx, &chg, sizeof chg)); |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
139 | require (EVP_DigestUpdate (&ctx, &id, sizeof id)); |
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
140 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
84 | EVP_MD_CTX_cleanup (&ctx); |
141 | EVP_MD_CTX_cleanup (&ctx); |
85 | } |
142 | } |
86 | |
143 | |
87 | struct rsa_entry { |
144 | struct rsa_entry |
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145 | { |
88 | tstamp expire; |
146 | tstamp expire; |
89 | rsaid id; |
147 | rsaid id; |
90 | rsachallenge chg; |
148 | rsachallenge chg; |
91 | }; |
149 | }; |
92 | |
150 | |
93 | struct rsa_cache : list<rsa_entry> |
151 | struct rsa_cache : list<rsa_entry> |
94 | { |
152 | { |
95 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
153 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
96 | |
154 | |
97 | bool find (const rsaid &id, rsachallenge &chg) |
155 | bool find (const rsaid &id, rsachallenge &chg) |
98 | { |
156 | { |
99 | for (iterator i = begin (); i != end (); ++i) |
157 | for (iterator i = begin (); i != end (); ++i) |
100 | { |
158 | { |
101 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev::ev_now ()) |
159 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
102 | { |
160 | { |
103 | memcpy (&chg, &i->chg, sizeof chg); |
161 | memcpy (&chg, &i->chg, sizeof chg); |
104 | |
162 | |
105 | erase (i); |
163 | erase (i); |
106 | return true; |
164 | return true; |
… | |
… | |
118 | rsa_entry e; |
176 | rsa_entry e; |
119 | |
177 | |
120 | RAND_bytes ((unsigned char *)&id, sizeof id); |
178 | RAND_bytes ((unsigned char *)&id, sizeof id); |
121 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
179 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
122 | |
180 | |
123 | e.expire = ev::ev_now () + RSA_TTL; |
181 | e.expire = ev_now () + RSA_TTL; |
124 | e.id = id; |
182 | e.id = id; |
125 | memcpy (&e.chg, &chg, sizeof chg); |
183 | memcpy (&e.chg, &chg, sizeof chg); |
126 | |
184 | |
127 | push_back (e); |
185 | push_back (e); |
128 | |
186 | |
129 | if (!cleaner.is_active ()) |
187 | if (!cleaner.is_active ()) |
130 | cleaner.again (); |
188 | cleaner.again (); |
131 | } |
189 | } |
132 | |
190 | |
133 | rsa_cache () |
191 | rsa_cache () |
134 | : cleaner (this, &rsa_cache::cleaner_cb) |
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135 | { |
192 | { |
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193 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
136 | cleaner.set (RSA_TTL, RSA_TTL); |
194 | cleaner.set (RSA_TTL, RSA_TTL); |
137 | } |
195 | } |
138 | |
196 | |
139 | } rsa_cache; |
197 | } rsa_cache; |
140 | |
198 | |
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199 | void |
141 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
200 | rsa_cache::cleaner_cb (ev::timer &w, int revents) |
142 | { |
201 | { |
143 | if (empty ()) |
202 | if (empty ()) |
144 | w.stop (); |
203 | w.stop (); |
145 | else |
204 | else |
146 | { |
205 | { |
147 | for (iterator i = begin (); i != end (); ) |
206 | for (iterator i = begin (); i != end (); ) |
148 | if (i->expire <= ev::ev_now ()) |
207 | if (i->expire <= ev_now ()) |
149 | i = erase (i); |
208 | i = erase (i); |
150 | else |
209 | else |
151 | ++i; |
210 | ++i; |
152 | } |
211 | } |
153 | } |
212 | } |
154 | |
213 | |
155 | ////////////////////////////////////////////////////////////////////////////// |
214 | ////////////////////////////////////////////////////////////////////////////// |
156 | |
215 | |
157 | void pkt_queue::put (net_packet *p) |
216 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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217 | : max_ttl (max_ttl), max_queue (max_queue) |
158 | { |
218 | { |
159 | if (queue[i]) |
219 | queue = new pkt [max_queue]; |
160 | { |
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161 | delete queue[i]; |
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162 | j = (j + 1) % QUEUEDEPTH; |
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163 | } |
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164 | |
220 | |
165 | queue[i] = p; |
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166 | |
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167 | i = (i + 1) % QUEUEDEPTH; |
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168 | } |
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169 | |
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170 | net_packet *pkt_queue::get () |
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171 | { |
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172 | net_packet *p = queue[j]; |
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173 | |
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174 | if (p) |
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175 | { |
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176 | queue[j] = 0; |
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177 | j = (j + 1) % QUEUEDEPTH; |
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178 | } |
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179 | |
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180 | return p; |
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181 | } |
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182 | |
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183 | pkt_queue::pkt_queue () |
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184 | { |
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185 | memset (queue, 0, sizeof (queue)); |
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186 | i = 0; |
221 | i = 0; |
187 | j = 0; |
222 | j = 0; |
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223 | |
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224 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
188 | } |
225 | } |
189 | |
226 | |
190 | pkt_queue::~pkt_queue () |
227 | pkt_queue::~pkt_queue () |
191 | { |
228 | { |
192 | for (i = QUEUEDEPTH; --i > 0; ) |
229 | while (net_packet *p = get ()) |
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230 | delete p; |
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231 | |
193 | delete queue[i]; |
232 | delete [] queue; |
194 | } |
233 | } |
195 | |
234 | |
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235 | void |
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236 | pkt_queue::expire_cb (ev::timer &w, int revents) |
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237 | { |
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238 | ev_tstamp expire = ev_now () - max_ttl; |
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239 | |
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240 | for (;;) |
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241 | { |
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242 | if (empty ()) |
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243 | break; |
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244 | |
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245 | double diff = queue[j].tstamp - expire; |
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246 | |
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247 | if (diff >= 0.) |
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248 | { |
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249 | w.start (diff > 0.5 ? diff : 0.5); |
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250 | break; |
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251 | } |
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252 | |
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253 | delete get (); |
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254 | } |
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255 | } |
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256 | |
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257 | void |
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258 | pkt_queue::put (net_packet *p) |
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259 | { |
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260 | ev_tstamp now = ev_now (); |
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261 | |
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262 | // start expiry timer |
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263 | if (empty ()) |
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264 | expire.start (max_ttl); |
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265 | |
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266 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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267 | |
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268 | if (ni == j) |
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269 | delete get (); |
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270 | |
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271 | queue[i].pkt = p; |
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272 | queue[i].tstamp = now; |
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273 | |
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274 | i = ni; |
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275 | } |
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276 | |
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277 | net_packet * |
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278 | pkt_queue::get () |
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279 | { |
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280 | if (empty ()) |
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281 | return 0; |
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282 | |
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283 | net_packet *p = queue[j].pkt; |
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284 | queue[j].pkt = 0; |
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285 | |
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286 | j = j + 1 == max_queue ? 0 : j + 1; |
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287 | |
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288 | return p; |
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289 | } |
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290 | |
196 | struct net_rateinfo { |
291 | struct net_rateinfo |
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292 | { |
197 | u32 host; |
293 | u32 host; |
198 | double pcnt, diff; |
294 | double pcnt, diff; |
199 | tstamp last; |
295 | tstamp last; |
200 | }; |
296 | }; |
201 | |
297 | |
… | |
… | |
211 | |
307 | |
212 | bool can (const sockinfo &si) { return can((u32)si.host); } |
308 | bool can (const sockinfo &si) { return can((u32)si.host); } |
213 | bool can (u32 host); |
309 | bool can (u32 host); |
214 | }; |
310 | }; |
215 | |
311 | |
216 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
312 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
217 | |
313 | |
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314 | bool |
218 | bool net_rate_limiter::can (u32 host) |
315 | net_rate_limiter::can (u32 host) |
219 | { |
316 | { |
220 | iterator i; |
317 | iterator i; |
221 | |
318 | |
222 | for (i = begin (); i != end (); ) |
319 | for (i = begin (); i != end (); ) |
223 | if (i->host == host) |
320 | if (i->host == host) |
224 | break; |
321 | break; |
225 | else if (i->last < ev::ev_now () - NRL_EXPIRE) |
322 | else if (i->last < ev_now () - NRL_EXPIRE) |
226 | i = erase (i); |
323 | i = erase (i); |
227 | else |
324 | else |
228 | i++; |
325 | i++; |
229 | |
326 | |
230 | if (i == end ()) |
327 | if (i == end ()) |
… | |
… | |
232 | net_rateinfo ri; |
329 | net_rateinfo ri; |
233 | |
330 | |
234 | ri.host = host; |
331 | ri.host = host; |
235 | ri.pcnt = 1.; |
332 | ri.pcnt = 1.; |
236 | ri.diff = NRL_MAXDIF; |
333 | ri.diff = NRL_MAXDIF; |
237 | ri.last = ev::ev_now (); |
334 | ri.last = ev_now (); |
238 | |
335 | |
239 | push_front (ri); |
336 | push_front (ri); |
240 | |
337 | |
241 | return true; |
338 | return true; |
242 | } |
339 | } |
… | |
… | |
244 | { |
341 | { |
245 | net_rateinfo ri (*i); |
342 | net_rateinfo ri (*i); |
246 | erase (i); |
343 | erase (i); |
247 | |
344 | |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
345 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
249 | ri.diff = ri.diff * NRL_ALPHA + (ev::ev_now () - ri.last); |
346 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
250 | |
347 | |
251 | ri.last = ev::ev_now (); |
348 | ri.last = ev_now (); |
252 | |
349 | |
253 | double dif = ri.diff / ri.pcnt; |
350 | double dif = ri.diff / ri.pcnt; |
254 | |
351 | |
255 | bool send = dif > NRL_CUTOFF; |
352 | bool send = dif > NRL_CUTOFF; |
256 | |
353 | |
… | |
… | |
270 | |
367 | |
271 | ///////////////////////////////////////////////////////////////////////////// |
368 | ///////////////////////////////////////////////////////////////////////////// |
272 | |
369 | |
273 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
370 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
274 | |
371 | |
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372 | void |
275 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
373 | hmac_packet::hmac_gen (crypto_ctx *ctx) |
276 | { |
374 | { |
277 | unsigned int xlen; |
375 | unsigned int xlen; |
278 | |
376 | |
279 | HMAC_CTX *hctx = &ctx->hctx; |
377 | HMAC_CTX *hctx = &ctx->hctx; |
280 | |
378 | |
… | |
… | |
298 | hmac_gen (ctx); |
396 | hmac_gen (ctx); |
299 | |
397 | |
300 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
398 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
301 | } |
399 | } |
302 | |
400 | |
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401 | void |
303 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
402 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
304 | { |
403 | { |
305 | type = type_; |
404 | type = type_; |
306 | |
405 | |
307 | int src = THISNODE->id; |
406 | int src = THISNODE->id; |
308 | |
407 | |
… | |
… | |
313 | |
412 | |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
413 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
414 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
316 | |
415 | |
317 | struct vpndata_packet : vpn_packet |
416 | struct vpndata_packet : vpn_packet |
|
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417 | { |
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418 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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419 | |
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420 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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421 | tap_packet *unpack (connection *conn, u32 &seqno); |
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422 | |
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423 | private: |
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424 | const u32 data_hdr_size () const |
318 | { |
425 | { |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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320 | |
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321 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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322 | tap_packet *unpack (connection *conn, u32 &seqno); |
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323 | private: |
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324 | |
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325 | const u32 data_hdr_size () const |
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326 | { |
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327 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
426 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
328 | } |
|
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329 | }; |
427 | } |
|
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428 | }; |
330 | |
429 | |
331 | void |
430 | void |
332 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
431 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
333 | { |
432 | { |
334 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
433 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
… | |
… | |
336 | ptype type = PT_DATA_UNCOMPRESSED; |
435 | ptype type = PT_DATA_UNCOMPRESSED; |
337 | |
436 | |
338 | #if ENABLE_COMPRESSION |
437 | #if ENABLE_COMPRESSION |
339 | u8 cdata[MAX_MTU]; |
438 | u8 cdata[MAX_MTU]; |
340 | |
439 | |
341 | if (conn->features & ENABLE_COMPRESSION) |
440 | if (conn->features & FEATURE_COMPRESSION) |
342 | { |
441 | { |
343 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
442 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
344 | |
443 | |
345 | if (cl) |
444 | if (cl) |
346 | { |
445 | { |
… | |
… | |
473 | #endif |
572 | #endif |
474 | return f; |
573 | return f; |
475 | } |
574 | } |
476 | }; |
575 | }; |
477 | |
576 | |
|
|
577 | void |
478 | void config_packet::setup (ptype type, int dst) |
578 | config_packet::setup (ptype type, int dst) |
479 | { |
579 | { |
480 | prot_major = PROTOCOL_MAJOR; |
580 | prot_major = PROTOCOL_MAJOR; |
481 | prot_minor = PROTOCOL_MINOR; |
581 | prot_minor = PROTOCOL_MINOR; |
482 | randsize = RAND_SIZE; |
582 | randsize = RAND_SIZE; |
483 | hmaclen = HMACLENGTH; |
583 | hmaclen = HMACLENGTH; |
… | |
… | |
491 | |
591 | |
492 | len = sizeof (*this) - sizeof (net_packet); |
592 | len = sizeof (*this) - sizeof (net_packet); |
493 | set_hdr (type, dst); |
593 | set_hdr (type, dst); |
494 | } |
594 | } |
495 | |
595 | |
|
|
596 | bool |
496 | bool config_packet::chk_config () const |
597 | config_packet::chk_config () const |
497 | { |
598 | { |
498 | if (prot_major != PROTOCOL_MAJOR) |
599 | if (prot_major != PROTOCOL_MAJOR) |
499 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
600 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
500 | else if (randsize != RAND_SIZE) |
601 | else if (randsize != RAND_SIZE) |
501 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
602 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
… | |
… | |
525 | rsaencrdata encr; |
626 | rsaencrdata encr; |
526 | |
627 | |
527 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
628 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
528 | { |
629 | { |
529 | config_packet::setup (PT_AUTH_REQ, dst); |
630 | config_packet::setup (PT_AUTH_REQ, dst); |
530 | strncpy (magic, MAGIC, 8); |
631 | strncpy (magic, MAGIC_OLD, 8); |
531 | initiate = !!initiate_; |
632 | initiate = !!initiate_; |
532 | protocols = protocols_; |
633 | protocols = protocols_; |
533 | |
634 | |
534 | len = sizeof (*this) - sizeof (net_packet); |
635 | len = sizeof (*this) - sizeof (net_packet); |
535 | } |
636 | } |
… | |
… | |
584 | ///////////////////////////////////////////////////////////////////////////// |
685 | ///////////////////////////////////////////////////////////////////////////// |
585 | |
686 | |
586 | void |
687 | void |
587 | connection::connection_established () |
688 | connection::connection_established () |
588 | { |
689 | { |
|
|
690 | slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
|
|
691 | |
589 | if (ictx && octx) |
692 | if (ictx && octx) |
590 | { |
693 | { |
591 | connectmode = conf->connectmode; |
|
|
592 | |
|
|
593 | // make sure rekeying timeouts are slightly asymmetric |
694 | // make sure rekeying timeouts are slightly asymmetric |
594 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
695 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
595 | rekey.start (rekey_interval, rekey_interval); |
696 | rekey.start (rekey_interval, rekey_interval); |
596 | keepalive.start (::conf.keepalive); |
697 | keepalive.start (::conf.keepalive); |
597 | |
698 | |
598 | // send queued packets |
699 | // send queued packets |
599 | if (ictx && octx) |
700 | if (ictx && octx) |
600 | { |
701 | { |
601 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
702 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
602 | { |
703 | { |
603 | send_data_packet (p); |
704 | if (p->len) send_data_packet (p); |
604 | delete p; |
705 | delete p; |
605 | } |
706 | } |
606 | |
707 | |
607 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
708 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
608 | { |
709 | { |
609 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
710 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
610 | delete p; |
711 | delete p; |
611 | } |
712 | } |
612 | } |
713 | } |
|
|
714 | |
|
|
715 | vpn->connection_established (this); |
613 | } |
716 | } |
614 | else |
717 | else |
615 | { |
718 | { |
616 | retry_cnt = 0; |
719 | retry_cnt = 0; |
617 | establish_connection.start (5); |
720 | establish_connection.start (5); |
… | |
… | |
621 | } |
724 | } |
622 | |
725 | |
623 | void |
726 | void |
624 | connection::reset_si () |
727 | connection::reset_si () |
625 | { |
728 | { |
|
|
729 | if (vpn->can_direct (THISNODE, conf)) |
626 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
730 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
627 | |
731 | else |
628 | // mask out protocols we cannot establish |
|
|
629 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
630 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
631 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
632 | |
|
|
633 | if (protocol |
|
|
634 | && (!conf->can_direct (THISNODE) |
|
|
635 | || !THISNODE->can_direct (conf))) |
|
|
636 | { |
732 | { |
637 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
733 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
638 | protocol = 0; |
734 | protocol = 0; |
639 | } |
735 | } |
640 | |
736 | |
641 | si.set (conf, protocol); |
737 | si.set (conf, protocol); |
|
|
738 | |
|
|
739 | is_direct = si.valid (); |
642 | } |
740 | } |
643 | |
741 | |
644 | // ensure sockinfo is valid, forward if necessary |
742 | // ensure sockinfo is valid, forward if necessary |
645 | const sockinfo & |
743 | const sockinfo & |
646 | connection::forward_si (const sockinfo &si) const |
744 | connection::forward_si (const sockinfo &si) const |
647 | { |
745 | { |
648 | if (!si.valid ()) |
746 | if (!si.valid ()) |
649 | { |
747 | { |
650 | connection *r = vpn->find_router (); |
748 | connection *r = vpn->find_router_for (this); |
651 | |
749 | |
652 | if (r) |
750 | if (r) |
653 | { |
751 | { |
654 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
752 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
655 | conf->nodename, r->conf->nodename, (const char *)r->si); |
753 | conf->nodename, r->conf->nodename); |
656 | return r->si; |
754 | return r->si; |
657 | } |
755 | } |
658 | else |
756 | else |
659 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
757 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
660 | conf->nodename); |
758 | conf->nodename); |
661 | } |
759 | } |
662 | |
760 | |
663 | return si; |
761 | return si; |
664 | } |
762 | } |
… | |
… | |
674 | connection::send_ping (const sockinfo &si, u8 pong) |
772 | connection::send_ping (const sockinfo &si, u8 pong) |
675 | { |
773 | { |
676 | ping_packet *pkt = new ping_packet; |
774 | ping_packet *pkt = new ping_packet; |
677 | |
775 | |
678 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
776 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
777 | |
|
|
778 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
|
|
779 | |
679 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
780 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
680 | |
781 | |
681 | delete pkt; |
782 | delete pkt; |
682 | } |
783 | } |
683 | |
784 | |
… | |
… | |
702 | |
803 | |
703 | rsachallenge chg; |
804 | rsachallenge chg; |
704 | rsa_cache.gen (pkt->id, chg); |
805 | rsa_cache.gen (pkt->id, chg); |
705 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
806 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
706 | |
807 | |
707 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
808 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
708 | |
809 | |
709 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
810 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
710 | |
811 | |
711 | delete pkt; |
812 | delete pkt; |
712 | } |
813 | } |
… | |
… | |
720 | |
821 | |
721 | rsa_hash (id, chg, pkt->response); |
822 | rsa_hash (id, chg, pkt->response); |
722 | |
823 | |
723 | pkt->hmac_set (octx); |
824 | pkt->hmac_set (octx); |
724 | |
825 | |
725 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
826 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
726 | |
827 | |
727 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
828 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
728 | |
829 | |
729 | delete pkt; |
830 | delete pkt; |
730 | } |
831 | } |
731 | |
832 | |
732 | void |
833 | void |
733 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
834 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
734 | { |
835 | { |
735 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
836 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
736 | conf->id, rid, (const char *)rsi); |
837 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
838 | conf->protocols); |
737 | |
839 | |
738 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
840 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
739 | |
841 | |
740 | r->hmac_set (octx); |
842 | r->hmac_set (octx); |
741 | send_vpn_packet (r, si); |
843 | send_vpn_packet (r, si); |
742 | |
844 | |
743 | delete r; |
845 | delete r; |
744 | } |
846 | } |
745 | |
847 | |
746 | void |
848 | inline void |
747 | connection::establish_connection_cb (ev::timer &w, int revents) |
849 | connection::establish_connection_cb (ev::timer &w, int revents) |
748 | { |
850 | { |
749 | if (!ictx |
851 | if (!(ictx && octx) |
750 | && conf != THISNODE |
852 | && conf != THISNODE |
751 | && connectmode != conf_node::C_NEVER |
853 | && connectmode != conf_node::C_NEVER |
752 | && connectmode != conf_node::C_DISABLED |
854 | && connectmode != conf_node::C_DISABLED |
753 | && !w.is_active ()) |
855 | && !w.is_active ()) |
754 | { |
856 | { |
|
|
857 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
|
|
858 | // and stop trying. should probably be handled by a per-connection expire handler. |
|
|
859 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
860 | { |
|
|
861 | reset_connection (); |
|
|
862 | return; |
|
|
863 | } |
|
|
864 | |
|
|
865 | last_establish_attempt = ev_now (); |
|
|
866 | |
755 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
867 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
756 | ? (retry_cnt & 3) + 1 |
868 | ? (retry_cnt & 3) + 1 |
757 | : 1 << (retry_cnt >> 2)); |
869 | : 1 << (retry_cnt >> 2)); |
758 | |
870 | |
759 | reset_si (); |
871 | reset_si (); |
760 | |
872 | |
761 | bool slow = si.prot & PROT_SLOW; |
873 | bool slow = si.prot & PROT_SLOW; |
762 | |
874 | |
763 | if (si.prot && !si.host) |
875 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
764 | { |
876 | { |
765 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
877 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
766 | w.start (1); |
878 | w.start (1); |
767 | vpn->send_connect_request (conf->id); |
879 | vpn->send_connect_request (this); |
768 | } |
880 | } |
769 | else |
881 | else |
770 | { |
882 | { |
|
|
883 | if (si.valid ()) |
|
|
884 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
885 | conf->nodename, (const char *)si); |
|
|
886 | |
771 | const sockinfo &dsi = forward_si (si); |
887 | const sockinfo &dsi = forward_si (si); |
772 | |
888 | |
773 | slow = slow || (dsi.prot & PROT_SLOW); |
889 | slow = slow || (dsi.prot & PROT_SLOW); |
774 | |
890 | |
775 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
891 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
… | |
… | |
779 | else |
895 | else |
780 | send_ping (dsi, 0); |
896 | send_ping (dsi, 0); |
781 | } |
897 | } |
782 | } |
898 | } |
783 | |
899 | |
784 | retry_int *= slow ? 8. : 0.7; |
900 | retry_int *= slow ? 8. : 0.9; |
785 | |
901 | |
786 | if (retry_int < conf->max_retry) |
902 | if (retry_int < conf->max_retry) |
787 | retry_cnt++; |
903 | retry_cnt++; |
788 | else |
904 | else |
789 | retry_int = conf->max_retry; |
905 | retry_int = conf->max_retry; |
… | |
… | |
799 | { |
915 | { |
800 | slog (L_INFO, _("%s(%s): connection lost"), |
916 | slog (L_INFO, _("%s(%s): connection lost"), |
801 | conf->nodename, (const char *)si); |
917 | conf->nodename, (const char *)si); |
802 | |
918 | |
803 | if (::conf.script_node_down) |
919 | if (::conf.script_node_down) |
804 | if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
920 | { |
|
|
921 | run_script_cb *cb = new run_script_cb; |
|
|
922 | cb->set<connection, &connection::script_node_down> (this); |
805 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
923 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
924 | } |
806 | } |
925 | } |
807 | |
926 | |
808 | delete ictx; ictx = 0; |
927 | delete ictx; ictx = 0; |
809 | delete octx; octx = 0; |
928 | delete octx; octx = 0; |
810 | #if ENABLE_DNS |
|
|
811 | dnsv4_reset_connection (); |
|
|
812 | #endif |
|
|
813 | |
929 | |
814 | si.host = 0; |
930 | si.host = 0; |
815 | |
931 | |
816 | last_activity = 0; |
932 | last_activity = 0.; |
|
|
933 | //last_si_change = 0.; |
817 | retry_cnt = 0; |
934 | retry_cnt = 0; |
818 | |
935 | |
819 | rekey.stop (); |
936 | rekey.stop (); |
820 | keepalive.stop (); |
937 | keepalive.stop (); |
821 | establish_connection.stop (); |
938 | establish_connection.stop (); |
… | |
… | |
828 | send_reset (si); |
945 | send_reset (si); |
829 | |
946 | |
830 | reset_connection (); |
947 | reset_connection (); |
831 | } |
948 | } |
832 | |
949 | |
833 | void |
950 | // poor-man's rekeying |
|
|
951 | inline void |
834 | connection::rekey_cb (ev::timer &w, int revents) |
952 | connection::rekey_cb (ev::timer &w, int revents) |
835 | { |
953 | { |
836 | reset_connection (); |
954 | reset_connection (); |
837 | establish_connection (); |
955 | establish_connection (); |
838 | } |
956 | } |
… | |
… | |
855 | if (oseqno > MAX_SEQNO) |
973 | if (oseqno > MAX_SEQNO) |
856 | rekey (); |
974 | rekey (); |
857 | } |
975 | } |
858 | |
976 | |
859 | void |
977 | void |
|
|
978 | connection::post_inject_queue () |
|
|
979 | { |
|
|
980 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
981 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
982 | establish_connection.stop (); |
|
|
983 | |
|
|
984 | establish_connection (); |
|
|
985 | } |
|
|
986 | |
|
|
987 | void |
860 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
988 | connection::inject_data_packet (tap_packet *pkt) |
861 | { |
989 | { |
862 | if (ictx && octx) |
990 | if (ictx && octx) |
863 | send_data_packet (pkt); |
991 | send_data_packet (pkt); |
864 | else |
992 | else |
865 | { |
993 | { |
866 | if (!broadcast) |
|
|
867 | data_queue.put (new tap_packet (*pkt)); |
994 | data_queue.put (new tap_packet (*pkt)); |
868 | |
995 | post_inject_queue (); |
869 | establish_connection (); |
|
|
870 | } |
996 | } |
871 | } |
997 | } |
872 | |
998 | |
|
|
999 | void |
873 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1000 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
874 | { |
1001 | { |
875 | if (ictx && octx) |
1002 | if (ictx && octx) |
876 | send_vpn_packet (pkt, si, tos); |
1003 | send_vpn_packet (pkt, si, tos); |
877 | else |
1004 | else |
878 | { |
1005 | { |
879 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
1006 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
880 | |
1007 | post_inject_queue (); |
881 | establish_connection (); |
|
|
882 | } |
1008 | } |
883 | } |
1009 | } |
884 | |
1010 | |
885 | void |
1011 | void |
886 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1012 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
887 | { |
1013 | { |
888 | last_activity = ev::ev_now (); |
1014 | last_activity = ev_now (); |
889 | |
1015 | |
890 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1016 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
891 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1017 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1018 | |
|
|
1019 | if (connectmode == conf_node::C_DISABLED) |
|
|
1020 | return; |
892 | |
1021 | |
893 | switch (pkt->typ ()) |
1022 | switch (pkt->typ ()) |
894 | { |
1023 | { |
895 | case vpn_packet::PT_PING: |
1024 | case vpn_packet::PT_PING: |
|
|
1025 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1026 | |
896 | // we send pings instead of auth packets after some retries, |
1027 | // we send pings instead of auth packets after some retries, |
897 | // so reset the retry counter and establish a connection |
1028 | // so reset the retry counter and establish a connection |
898 | // when we receive a ping. |
1029 | // when we receive a ping. |
899 | if (!ictx) |
1030 | if (!ictx) |
900 | { |
1031 | { |
901 | if (auth_rate_limiter.can (rsi)) |
1032 | if (auth_rate_limiter.can (rsi)) |
902 | send_auth_request (rsi, true); |
1033 | send_auth_request (rsi, true); |
903 | } |
1034 | } |
904 | else |
1035 | else |
|
|
1036 | // we would love to change the socket address here, but ping's aren't |
|
|
1037 | // authenticated, so we best ignore it. |
905 | send_ping (rsi, 1); // pong |
1038 | send_ping (rsi, 1); // pong |
906 | |
1039 | |
907 | break; |
1040 | break; |
908 | |
1041 | |
909 | case vpn_packet::PT_PONG: |
1042 | case vpn_packet::PT_PONG: |
|
|
1043 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1044 | |
|
|
1045 | // a PONG might mean that the other side doesn't really know |
|
|
1046 | // about our desire for communication. |
|
|
1047 | establish_connection (); |
910 | break; |
1048 | break; |
911 | |
1049 | |
912 | case vpn_packet::PT_RESET: |
1050 | case vpn_packet::PT_RESET: |
913 | { |
1051 | { |
914 | reset_connection (); |
1052 | reset_connection (); |
915 | |
1053 | |
916 | config_packet *p = (config_packet *) pkt; |
1054 | config_packet *p = (config_packet *) pkt; |
917 | |
1055 | |
918 | if (!p->chk_config ()) |
1056 | if (!p->chk_config ()) |
919 | { |
1057 | { |
920 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1058 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
921 | conf->nodename, (const char *)rsi); |
1059 | conf->nodename, (const char *)rsi); |
922 | connectmode = conf_node::C_DISABLED; |
1060 | connectmode = conf_node::C_DISABLED; |
923 | } |
1061 | } |
924 | else if (connectmode == conf_node::C_ALWAYS) |
1062 | else if (connectmode == conf_node::C_ALWAYS) |
925 | establish_connection (); |
1063 | establish_connection (); |
… | |
… | |
927 | break; |
1065 | break; |
928 | |
1066 | |
929 | case vpn_packet::PT_AUTH_REQ: |
1067 | case vpn_packet::PT_AUTH_REQ: |
930 | if (auth_rate_limiter.can (rsi)) |
1068 | if (auth_rate_limiter.can (rsi)) |
931 | { |
1069 | { |
932 | auth_req_packet *p = (auth_req_packet *) pkt; |
1070 | auth_req_packet *p = (auth_req_packet *)pkt; |
933 | |
1071 | |
934 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1072 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1073 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1074 | p->protocols, p->features); |
935 | |
1075 | |
936 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1076 | if (p->chk_config () |
|
|
1077 | && (!memcmp (p->magic, MAGIC_OLD, 8) || !memcmp (p->magic, MAGIC, 8))) |
937 | { |
1078 | { |
938 | if (p->prot_minor != PROTOCOL_MINOR) |
1079 | if (p->prot_minor != PROTOCOL_MINOR) |
939 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1080 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
940 | conf->nodename, (const char *)rsi, |
1081 | conf->nodename, (const char *)rsi, |
941 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1082 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
… | |
… | |
967 | |
1108 | |
968 | break; |
1109 | break; |
969 | } |
1110 | } |
970 | } |
1111 | } |
971 | else |
1112 | else |
972 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1113 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
973 | conf->nodename, (const char *)rsi); |
1114 | conf->nodename, (const char *)rsi); |
974 | |
1115 | |
975 | send_reset (rsi); |
1116 | send_reset (rsi); |
976 | } |
1117 | } |
977 | |
1118 | |
978 | break; |
1119 | break; |
979 | |
1120 | |
980 | case vpn_packet::PT_AUTH_RES: |
1121 | case vpn_packet::PT_AUTH_RES: |
981 | { |
1122 | { |
982 | auth_res_packet *p = (auth_res_packet *) pkt; |
1123 | auth_res_packet *p = (auth_res_packet *)pkt; |
983 | |
1124 | |
984 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1125 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
985 | |
1126 | |
986 | if (p->chk_config ()) |
1127 | if (p->chk_config ()) |
987 | { |
1128 | { |
988 | if (p->prot_minor != PROTOCOL_MINOR) |
1129 | if (p->prot_minor != PROTOCOL_MINOR) |
989 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1130 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
992 | |
1133 | |
993 | rsachallenge chg; |
1134 | rsachallenge chg; |
994 | |
1135 | |
995 | if (!rsa_cache.find (p->id, chg)) |
1136 | if (!rsa_cache.find (p->id, chg)) |
996 | { |
1137 | { |
997 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1138 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
998 | conf->nodename, (const char *)rsi); |
1139 | conf->nodename, (const char *)rsi); |
999 | break; |
1140 | break; |
1000 | } |
1141 | } |
1001 | else |
1142 | else |
1002 | { |
1143 | { |
1003 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1144 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1004 | |
1145 | |
1005 | if (!p->hmac_chk (cctx)) |
1146 | if (!p->hmac_chk (cctx)) |
1006 | { |
1147 | { |
1007 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1148 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1008 | "could be an attack, or just corruption or a synchronization error"), |
1149 | "could be an attack, or just corruption or a synchronization error."), |
1009 | conf->nodename, (const char *)rsi); |
1150 | conf->nodename, (const char *)rsi); |
1010 | break; |
1151 | break; |
1011 | } |
1152 | } |
1012 | else |
1153 | else |
1013 | { |
1154 | { |
… | |
… | |
1024 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1165 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1025 | |
1166 | |
1026 | si = rsi; |
1167 | si = rsi; |
1027 | protocol = rsi.prot; |
1168 | protocol = rsi.prot; |
1028 | |
1169 | |
|
|
1170 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
1171 | conf->nodename, (const char *)rsi, |
|
|
1172 | is_direct ? "direct" : "forwarded", |
|
|
1173 | p->prot_major, p->prot_minor); |
|
|
1174 | |
1029 | connection_established (); |
1175 | connection_established (); |
1030 | |
1176 | |
1031 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1032 | conf->nodename, (const char *)rsi, |
|
|
1033 | p->prot_major, p->prot_minor); |
|
|
1034 | |
|
|
1035 | if (::conf.script_node_up) |
1177 | if (::conf.script_node_up) |
1036 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
1178 | { |
|
|
1179 | run_script_cb *cb = new run_script_cb; |
|
|
1180 | cb->set<connection, &connection::script_node_up> (this); |
1037 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
1181 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
1182 | } |
1038 | |
1183 | |
1039 | break; |
1184 | break; |
1040 | } |
1185 | } |
1041 | else |
1186 | else |
1042 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1187 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
1043 | conf->nodename, (const char *)rsi); |
1188 | conf->nodename, (const char *)rsi); |
1044 | } |
1189 | } |
1045 | |
1190 | |
1046 | delete cctx; |
1191 | delete cctx; |
1047 | } |
1192 | } |
… | |
… | |
1063 | { |
1208 | { |
1064 | vpndata_packet *p = (vpndata_packet *)pkt; |
1209 | vpndata_packet *p = (vpndata_packet *)pkt; |
1065 | |
1210 | |
1066 | if (!p->hmac_chk (ictx)) |
1211 | if (!p->hmac_chk (ictx)) |
1067 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1212 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1068 | "could be an attack, or just corruption or a synchronization error"), |
1213 | "could be an attack, or just corruption or a synchronization error."), |
1069 | conf->nodename, (const char *)rsi); |
1214 | conf->nodename, (const char *)rsi); |
1070 | else |
1215 | else |
1071 | { |
1216 | { |
1072 | u32 seqno; |
1217 | u32 seqno; |
1073 | tap_packet *d = p->unpack (this, seqno); |
1218 | tap_packet *d = p->unpack (this, seqno); |
|
|
1219 | int seqclass = iseqno.seqno_classify (seqno); |
1074 | |
1220 | |
1075 | if (iseqno.recv_ok (seqno)) |
1221 | if (seqclass == 0) // ok |
1076 | { |
1222 | { |
1077 | vpn->tap->send (d); |
1223 | vpn->tap->send (d); |
1078 | |
1224 | |
1079 | if (si != rsi) |
1225 | if (si != rsi) |
1080 | { |
1226 | { |
1081 | // fast re-sync on source address changes, useful especially for tcp/ip |
1227 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1228 | //if (last_si_change < ev_now () + 5.) |
1082 | si = rsi; |
1229 | // { |
1083 | |
|
|
1084 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1230 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1085 | conf->nodename, (const char *)si, (const char *)rsi); |
1231 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1232 | |
|
|
1233 | si = rsi; |
|
|
1234 | |
|
|
1235 | if (::conf.script_node_change) |
|
|
1236 | { |
|
|
1237 | run_script_cb *cb = new run_script_cb; |
|
|
1238 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1239 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1240 | } |
|
|
1241 | |
|
|
1242 | // } |
|
|
1243 | //else |
|
|
1244 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1245 | // conf->nodename, (const char *)si, (const char *)rsi); |
1086 | } |
1246 | } |
|
|
1247 | } |
|
|
1248 | else if (seqclass == 1) // far history |
|
|
1249 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1250 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1251 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1252 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1253 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1254 | else if (seqclass == 3) // reset |
|
|
1255 | { |
|
|
1256 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1257 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1258 | send_reset (rsi); |
1087 | } |
1259 | } |
1088 | |
1260 | |
1089 | delete d; |
1261 | delete d; |
1090 | break; |
1262 | break; |
1091 | } |
1263 | } |
… | |
… | |
1095 | break; |
1267 | break; |
1096 | |
1268 | |
1097 | case vpn_packet::PT_CONNECT_REQ: |
1269 | case vpn_packet::PT_CONNECT_REQ: |
1098 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1270 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1099 | { |
1271 | { |
1100 | connect_req_packet *p = (connect_req_packet *) pkt; |
1272 | connect_req_packet *p = (connect_req_packet *)pkt; |
1101 | |
1273 | |
1102 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1274 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1103 | { |
1275 | { |
1104 | connection *c = vpn->conns[p->id - 1]; |
1276 | connection *c = vpn->conns[p->id - 1]; |
1105 | conf->protocols = p->protocols; |
1277 | conf->protocols = p->protocols; |
1106 | |
1278 | |
1107 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
1279 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1280 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1281 | p->protocols, |
1108 | conf->id, p->id, c->ictx && c->octx); |
1282 | c->ictx && c->octx); |
1109 | |
1283 | |
1110 | if (c->ictx && c->octx) |
1284 | if (c->ictx && c->octx) |
1111 | { |
1285 | { |
1112 | // send connect_info packets to both sides, in case one is |
1286 | // send connect_info packets to both sides, in case one is |
1113 | // behind a nat firewall (or both ;) |
1287 | // behind a nat firewall (or both ;) |
… | |
… | |
1136 | |
1310 | |
1137 | c->conf->protocols = p->protocols; |
1311 | c->conf->protocols = p->protocols; |
1138 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1312 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1139 | p->si.upgrade_protocol (protocol, c->conf); |
1313 | p->si.upgrade_protocol (protocol, c->conf); |
1140 | |
1314 | |
1141 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1315 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1142 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1316 | conf->nodename, |
|
|
1317 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1318 | (const char *)p->si, |
|
|
1319 | p->protocols, |
|
|
1320 | protocol, |
|
|
1321 | p->si.supported_protocols (c->conf), |
|
|
1322 | !c->ictx && !c->octx); |
1143 | |
1323 | |
1144 | const sockinfo &dsi = forward_si (p->si); |
1324 | const sockinfo &dsi = forward_si (p->si); |
1145 | |
1325 | |
1146 | if (dsi.valid ()) |
1326 | if (dsi.valid ()) |
1147 | c->send_auth_request (dsi, true); |
1327 | c->send_auth_request (dsi, true); |
|
|
1328 | else |
|
|
1329 | slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
|
|
1330 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1331 | (const char *)p->si); |
1148 | } |
1332 | } |
1149 | else |
1333 | else |
1150 | slog (L_WARN, |
1334 | slog (L_WARN, |
1151 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1335 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1152 | p->id); |
1336 | p->id); |
… | |
… | |
1158 | send_reset (rsi); |
1342 | send_reset (rsi); |
1159 | break; |
1343 | break; |
1160 | } |
1344 | } |
1161 | } |
1345 | } |
1162 | |
1346 | |
|
|
1347 | inline void |
1163 | void connection::keepalive_cb (ev::timer &w, int revents) |
1348 | connection::keepalive_cb (ev::timer &w, int revents) |
1164 | { |
1349 | { |
1165 | if (ev::ev_now () >= last_activity + ::conf.keepalive + 30) |
1350 | if (ev_now () >= last_activity + ::conf.keepalive + 15) |
1166 | { |
1351 | { |
1167 | reset_connection (); |
1352 | reset_connection (); |
1168 | establish_connection (); |
1353 | establish_connection (); |
1169 | } |
1354 | } |
1170 | else if (ev::ev_now () < last_activity + ::conf.keepalive) |
1355 | else if (ev_now () < last_activity + ::conf.keepalive) |
1171 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1356 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1172 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1357 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1173 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1358 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1174 | { |
1359 | { |
1175 | send_ping (si); |
1360 | send_ping (si); |
1176 | w.start (5); |
1361 | w.start (3); |
1177 | } |
1362 | } |
1178 | else if (ev::ev_now () < last_activity + ::conf.keepalive + 10) |
1363 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1179 | // hold ondemand connections implicitly a few seconds longer |
1364 | // hold ondemand connections implicitly a few seconds longer |
1180 | // should delete octx, though, or something like that ;) |
1365 | // should delete octx, though, or something like that ;) |
1181 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1366 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1182 | else |
1367 | else |
1183 | reset_connection (); |
1368 | reset_connection (); |
1184 | } |
1369 | } |
1185 | |
1370 | |
|
|
1371 | void |
1186 | void connection::send_connect_request (int id) |
1372 | connection::send_connect_request (int id) |
1187 | { |
1373 | { |
1188 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1374 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1189 | |
1375 | |
1190 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1376 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1377 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1378 | THISNODE->protocols); |
1191 | p->hmac_set (octx); |
1379 | p->hmac_set (octx); |
1192 | send_vpn_packet (p, si); |
1380 | send_vpn_packet (p, si); |
1193 | |
1381 | |
1194 | delete p; |
1382 | delete p; |
1195 | } |
1383 | } |
1196 | |
1384 | |
|
|
1385 | void |
1197 | void connection::script_init_env (const char *ext) |
1386 | connection::script_init_env (const char *ext) |
1198 | { |
1387 | { |
1199 | char *env; |
1388 | char *env; |
1200 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1389 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1201 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1390 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1202 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1391 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1203 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1392 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1204 | conf->id & 0xff); putenv (env); |
1393 | conf->id & 0xff); putenv (env); |
1205 | } |
1394 | } |
1206 | |
1395 | |
|
|
1396 | void |
1207 | void connection::script_init_connect_env () |
1397 | connection::script_init_connect_env () |
1208 | { |
1398 | { |
1209 | vpn->script_init_env (); |
1399 | vpn->script_init_env (); |
1210 | |
1400 | |
1211 | char *env; |
1401 | char *env; |
1212 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1402 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1403 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1213 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1404 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1214 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1405 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1215 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1406 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1216 | } |
1407 | } |
1217 | |
1408 | |
|
|
1409 | inline const char * |
1218 | const char *connection::script_node_up () |
1410 | connection::script_node_up () |
1219 | { |
1411 | { |
1220 | script_init_connect_env (); |
1412 | script_init_connect_env (); |
1221 | |
1413 | |
1222 | putenv ((char *)"STATE=up"); |
1414 | putenv ((char *)"STATE=up"); |
1223 | |
1415 | |
… | |
… | |
1228 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1420 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1229 | |
1421 | |
1230 | return filename; |
1422 | return filename; |
1231 | } |
1423 | } |
1232 | |
1424 | |
|
|
1425 | inline const char * |
|
|
1426 | connection::script_node_change () |
|
|
1427 | { |
|
|
1428 | script_init_connect_env (); |
|
|
1429 | |
|
|
1430 | putenv ((char *)"STATE=change"); |
|
|
1431 | |
|
|
1432 | char *filename; |
|
|
1433 | asprintf (&filename, |
|
|
1434 | "%s/%s", |
|
|
1435 | confbase, |
|
|
1436 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
|
|
1437 | |
|
|
1438 | return filename; |
|
|
1439 | } |
|
|
1440 | |
|
|
1441 | inline const char * |
1233 | const char *connection::script_node_down () |
1442 | connection::script_node_down () |
1234 | { |
1443 | { |
1235 | script_init_connect_env (); |
1444 | script_init_connect_env (); |
1236 | |
1445 | |
1237 | putenv ((char *)"STATE=down"); |
1446 | putenv ((char *)"STATE=down"); |
1238 | |
1447 | |
… | |
… | |
1244 | |
1453 | |
1245 | return filename; |
1454 | return filename; |
1246 | } |
1455 | } |
1247 | |
1456 | |
1248 | connection::connection (struct vpn *vpn, conf_node *conf) |
1457 | connection::connection (struct vpn *vpn, conf_node *conf) |
1249 | : vpn(vpn), conf(conf) |
1458 | : vpn(vpn), conf(conf), |
1250 | , rekey (this, &connection::rekey_cb) |
|
|
1251 | , keepalive (this, &connection::keepalive_cb) |
|
|
1252 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1253 | #if ENABLE_DNS |
1459 | #if ENABLE_DNS |
1254 | , dns (0) |
1460 | dns (0), |
1255 | #endif |
1461 | #endif |
|
|
1462 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1463 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1256 | { |
1464 | { |
|
|
1465 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1466 | keepalive .set<connection, &connection::keepalive_cb > (this); |
|
|
1467 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
|
|
1468 | |
|
|
1469 | last_establish_attempt = 0.; |
1257 | octx = ictx = 0; |
1470 | octx = ictx = 0; |
1258 | retry_cnt = 0; |
|
|
1259 | |
1471 | |
1260 | if (!conf->protocols) // make sure some protocol is enabled |
1472 | connectmode = conf->connectmode; |
1261 | conf->protocols = PROT_UDPv4; |
|
|
1262 | |
1473 | |
1263 | connectmode = conf_node::C_ALWAYS; // initial setting |
1474 | // queue a dummy packet to force an initial connection attempt |
|
|
1475 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1476 | vpn_queue.put (new net_packet); |
|
|
1477 | |
1264 | reset_connection (); |
1478 | reset_connection (); |
1265 | } |
1479 | } |
1266 | |
1480 | |
1267 | connection::~connection () |
1481 | connection::~connection () |
1268 | { |
1482 | { |
1269 | shutdown (); |
1483 | shutdown (); |
1270 | } |
1484 | } |
1271 | |
1485 | |
|
|
1486 | void |
1272 | void connection_init () |
1487 | connection_init () |
1273 | { |
1488 | { |
1274 | auth_rate_limiter.clear (); |
1489 | auth_rate_limiter.clear (); |
1275 | reset_rate_limiter.clear (); |
1490 | reset_rate_limiter.clear (); |
1276 | } |
1491 | } |
1277 | |
1492 | |