1 |
pcg |
1.1 |
/* |
2 |
|
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connection.C -- manage a single connection |
3 |
root |
1.93 |
Copyright (C) 2003-2008,2010,2011 Marc Lehmann <gvpe@schmorp.de> |
4 |
pcg |
1.1 |
|
5 |
pcg |
1.42 |
This file is part of GVPE. |
6 |
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|
7 |
pcg |
1.69 |
GVPE is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published by the |
9 |
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Free Software Foundation; either version 3 of the License, or (at your |
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option) any later version. |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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Public License for more details. |
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You should have received a copy of the GNU General Public License along |
18 |
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with this program; if not, see <http://www.gnu.org/licenses/>. |
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Additional permission under GNU GPL version 3 section 7 |
21 |
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22 |
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If you modify this Program, or any covered work, by linking or |
23 |
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combining it with the OpenSSL project's OpenSSL library (or a modified |
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version of that library), containing parts covered by the terms of the |
25 |
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OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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additional permission to convey the resulting work. Corresponding |
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Source for a non-source form of such a combination shall include the |
28 |
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source code for the parts of OpenSSL used as well as that of the |
29 |
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covered work. |
30 |
pcg |
1.1 |
*/ |
31 |
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32 |
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#include "config.h" |
33 |
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34 |
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#include <list> |
35 |
pcg |
1.70 |
#include <queue> |
36 |
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#include <utility> |
37 |
pcg |
1.1 |
|
38 |
pcg |
1.2 |
#include <openssl/rand.h> |
39 |
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#include <openssl/evp.h> |
40 |
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#include <openssl/rsa.h> |
41 |
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#include <openssl/err.h> |
42 |
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43 |
pcg |
1.1 |
#include "conf.h" |
44 |
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#include "slog.h" |
45 |
|
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#include "device.h" |
46 |
pcg |
1.2 |
#include "vpn.h" |
47 |
pcg |
1.1 |
#include "connection.h" |
48 |
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|
49 |
pcg |
1.20 |
#include "netcompat.h" |
50 |
pcg |
1.19 |
|
51 |
pcg |
1.1 |
#if !HAVE_RAND_PSEUDO_BYTES |
52 |
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# define RAND_pseudo_bytes RAND_bytes |
53 |
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#endif |
54 |
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|
55 |
pcg |
1.85 |
#define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol) |
56 |
|
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#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated) |
57 |
pcg |
1.30 |
|
58 |
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#define ULTRA_FAST 1 |
59 |
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#define HLOG 15 |
60 |
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#include "lzf/lzf.h" |
61 |
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#include "lzf/lzf_c.c" |
62 |
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#include "lzf/lzf_d.c" |
63 |
pcg |
1.1 |
|
64 |
pcg |
1.70 |
////////////////////////////////////////////////////////////////////////////// |
65 |
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|
66 |
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static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
67 |
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static ev::child rs_child_ev; |
68 |
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|
69 |
root |
1.90 |
namespace |
70 |
pcg |
1.70 |
{ |
71 |
root |
1.90 |
void // c++ requires external linkage here, apparently :( |
72 |
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rs_child_cb (ev::child &w, int revents) |
73 |
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{ |
74 |
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w.stop (); |
75 |
pcg |
1.70 |
|
76 |
root |
1.90 |
if (rs_queue.empty ()) |
77 |
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return; |
78 |
pcg |
1.70 |
|
79 |
root |
1.90 |
pid_t pid = run_script (*rs_queue.front ().first, false); |
80 |
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if (pid) |
81 |
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{ |
82 |
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w.set (pid); |
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w.start (); |
84 |
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} |
85 |
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else |
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slog (L_WARN, rs_queue.front ().second); |
87 |
pcg |
1.70 |
|
88 |
root |
1.90 |
delete rs_queue.front ().first; |
89 |
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rs_queue.pop (); |
90 |
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} |
91 |
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}; |
92 |
pcg |
1.70 |
|
93 |
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// despite the fancy name, this is quite a hack |
94 |
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static void |
95 |
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run_script_queued (run_script_cb *cb, const char *warnmsg) |
96 |
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{ |
97 |
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rs_queue.push (std::make_pair (cb, warnmsg)); |
98 |
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99 |
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if (!rs_child_ev.is_active ()) |
100 |
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{ |
101 |
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rs_child_ev.set<rs_child_cb> (); |
102 |
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rs_child_ev (); |
103 |
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} |
104 |
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} |
105 |
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106 |
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////////////////////////////////////////////////////////////////////////////// |
107 |
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108 |
pcg |
1.1 |
struct crypto_ctx |
109 |
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{ |
110 |
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EVP_CIPHER_CTX cctx; |
111 |
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HMAC_CTX hctx; |
112 |
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113 |
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crypto_ctx (const rsachallenge &challenge, int enc); |
114 |
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~crypto_ctx (); |
115 |
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}; |
116 |
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117 |
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crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
118 |
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{ |
119 |
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EVP_CIPHER_CTX_init (&cctx); |
120 |
pcg |
1.29 |
require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
121 |
pcg |
1.1 |
HMAC_CTX_init (&hctx); |
122 |
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HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
123 |
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} |
124 |
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125 |
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crypto_ctx::~crypto_ctx () |
126 |
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{ |
127 |
pcg |
1.29 |
require (EVP_CIPHER_CTX_cleanup (&cctx)); |
128 |
pcg |
1.1 |
HMAC_CTX_cleanup (&hctx); |
129 |
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} |
130 |
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131 |
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static void |
132 |
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rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
133 |
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{ |
134 |
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EVP_MD_CTX ctx; |
135 |
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136 |
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EVP_MD_CTX_init (&ctx); |
137 |
root |
1.95 |
require (EVP_DigestInit (&ctx, RSA_HASH)); |
138 |
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require (EVP_DigestUpdate (&ctx, &chg, sizeof chg)); |
139 |
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require (EVP_DigestUpdate (&ctx, &id, sizeof id)); |
140 |
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require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
141 |
pcg |
1.1 |
EVP_MD_CTX_cleanup (&ctx); |
142 |
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} |
143 |
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|
144 |
pcg |
1.63 |
struct rsa_entry |
145 |
|
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{ |
146 |
pcg |
1.1 |
tstamp expire; |
147 |
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rsaid id; |
148 |
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rsachallenge chg; |
149 |
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}; |
150 |
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|
151 |
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struct rsa_cache : list<rsa_entry> |
152 |
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{ |
153 |
pcg |
1.66 |
inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
154 |
pcg |
1.1 |
|
155 |
|
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bool find (const rsaid &id, rsachallenge &chg) |
156 |
pcg |
1.51 |
{ |
157 |
|
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for (iterator i = begin (); i != end (); ++i) |
158 |
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{ |
159 |
pcg |
1.62 |
if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
160 |
pcg |
1.51 |
{ |
161 |
|
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memcpy (&chg, &i->chg, sizeof chg); |
162 |
pcg |
1.1 |
|
163 |
pcg |
1.51 |
erase (i); |
164 |
|
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return true; |
165 |
|
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} |
166 |
|
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} |
167 |
pcg |
1.1 |
|
168 |
pcg |
1.60 |
if (!cleaner.is_active ()) |
169 |
|
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cleaner.again (); |
170 |
pcg |
1.1 |
|
171 |
pcg |
1.51 |
return false; |
172 |
|
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} |
173 |
pcg |
1.1 |
|
174 |
|
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void gen (rsaid &id, rsachallenge &chg) |
175 |
pcg |
1.51 |
{ |
176 |
|
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rsa_entry e; |
177 |
pcg |
1.1 |
|
178 |
pcg |
1.51 |
RAND_bytes ((unsigned char *)&id, sizeof id); |
179 |
|
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RAND_bytes ((unsigned char *)&chg, sizeof chg); |
180 |
pcg |
1.1 |
|
181 |
pcg |
1.62 |
e.expire = ev_now () + RSA_TTL; |
182 |
pcg |
1.51 |
e.id = id; |
183 |
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memcpy (&e.chg, &chg, sizeof chg); |
184 |
pcg |
1.1 |
|
185 |
pcg |
1.51 |
push_back (e); |
186 |
pcg |
1.1 |
|
187 |
pcg |
1.60 |
if (!cleaner.is_active ()) |
188 |
|
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cleaner.again (); |
189 |
pcg |
1.51 |
} |
190 |
pcg |
1.1 |
|
191 |
|
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rsa_cache () |
192 |
pcg |
1.60 |
{ |
193 |
pcg |
1.65 |
cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
194 |
pcg |
1.60 |
cleaner.set (RSA_TTL, RSA_TTL); |
195 |
|
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} |
196 |
pcg |
1.1 |
|
197 |
|
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} rsa_cache; |
198 |
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|
199 |
root |
1.90 |
void |
200 |
|
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rsa_cache::cleaner_cb (ev::timer &w, int revents) |
201 |
pcg |
1.1 |
{ |
202 |
pcg |
1.60 |
if (empty ()) |
203 |
|
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w.stop (); |
204 |
|
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else |
205 |
pcg |
1.1 |
{ |
206 |
|
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for (iterator i = begin (); i != end (); ) |
207 |
pcg |
1.62 |
if (i->expire <= ev_now ()) |
208 |
pcg |
1.1 |
i = erase (i); |
209 |
|
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else |
210 |
|
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++i; |
211 |
|
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} |
212 |
|
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} |
213 |
|
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|
214 |
|
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////////////////////////////////////////////////////////////////////////////// |
215 |
|
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|
216 |
pcg |
1.67 |
pkt_queue::pkt_queue (double max_ttl, int max_queue) |
217 |
|
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: max_ttl (max_ttl), max_queue (max_queue) |
218 |
pcg |
1.1 |
{ |
219 |
pcg |
1.67 |
queue = new pkt [max_queue]; |
220 |
|
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|
221 |
|
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i = 0; |
222 |
|
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j = 0; |
223 |
|
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|
224 |
|
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expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
225 |
|
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} |
226 |
pcg |
1.1 |
|
227 |
pcg |
1.67 |
pkt_queue::~pkt_queue () |
228 |
|
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{ |
229 |
|
|
while (net_packet *p = get ()) |
230 |
|
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delete p; |
231 |
pcg |
1.1 |
|
232 |
pcg |
1.67 |
delete [] queue; |
233 |
pcg |
1.1 |
} |
234 |
|
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|
235 |
root |
1.90 |
void |
236 |
|
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pkt_queue::expire_cb (ev::timer &w, int revents) |
237 |
pcg |
1.1 |
{ |
238 |
pcg |
1.67 |
ev_tstamp expire = ev_now () - max_ttl; |
239 |
pcg |
1.1 |
|
240 |
pcg |
1.67 |
for (;;) |
241 |
pcg |
1.1 |
{ |
242 |
pcg |
1.67 |
if (empty ()) |
243 |
|
|
break; |
244 |
|
|
|
245 |
|
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double diff = queue[j].tstamp - expire; |
246 |
|
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|
247 |
|
|
if (diff >= 0.) |
248 |
|
|
{ |
249 |
|
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w.start (diff > 0.5 ? diff : 0.5); |
250 |
|
|
break; |
251 |
|
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} |
252 |
|
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|
253 |
|
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delete get (); |
254 |
pcg |
1.1 |
} |
255 |
|
|
} |
256 |
|
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|
257 |
root |
1.90 |
void |
258 |
|
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pkt_queue::put (net_packet *p) |
259 |
pcg |
1.1 |
{ |
260 |
pcg |
1.67 |
ev_tstamp now = ev_now (); |
261 |
|
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|
262 |
|
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// start expiry timer |
263 |
|
|
if (empty ()) |
264 |
|
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expire.start (max_ttl); |
265 |
|
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|
266 |
|
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int ni = i + 1 == max_queue ? 0 : i + 1; |
267 |
|
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|
268 |
|
|
if (ni == j) |
269 |
|
|
delete get (); |
270 |
|
|
|
271 |
|
|
queue[i].pkt = p; |
272 |
|
|
queue[i].tstamp = now; |
273 |
|
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|
274 |
|
|
i = ni; |
275 |
pcg |
1.1 |
} |
276 |
|
|
|
277 |
root |
1.90 |
net_packet * |
278 |
|
|
pkt_queue::get () |
279 |
pcg |
1.1 |
{ |
280 |
pcg |
1.67 |
if (empty ()) |
281 |
|
|
return 0; |
282 |
|
|
|
283 |
|
|
net_packet *p = queue[j].pkt; |
284 |
|
|
queue[j].pkt = 0; |
285 |
|
|
|
286 |
|
|
j = j + 1 == max_queue ? 0 : j + 1; |
287 |
|
|
|
288 |
|
|
return p; |
289 |
pcg |
1.1 |
} |
290 |
|
|
|
291 |
pcg |
1.63 |
struct net_rateinfo |
292 |
|
|
{ |
293 |
pcg |
1.1 |
u32 host; |
294 |
|
|
double pcnt, diff; |
295 |
|
|
tstamp last; |
296 |
|
|
}; |
297 |
|
|
|
298 |
|
|
// only do action once every x seconds per host whole allowing bursts. |
299 |
|
|
// this implementation ("splay list" ;) is inefficient, |
300 |
|
|
// but low on resources. |
301 |
|
|
struct net_rate_limiter : list<net_rateinfo> |
302 |
|
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{ |
303 |
pcg |
1.35 |
# define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
304 |
|
|
# define NRL_CUTOFF 10. // one event every CUTOFF seconds |
305 |
|
|
# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
306 |
|
|
# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
307 |
pcg |
1.1 |
|
308 |
pcg |
1.16 |
bool can (const sockinfo &si) { return can((u32)si.host); } |
309 |
pcg |
1.1 |
bool can (u32 host); |
310 |
|
|
}; |
311 |
|
|
|
312 |
root |
1.90 |
static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
313 |
pcg |
1.1 |
|
314 |
root |
1.90 |
bool |
315 |
|
|
net_rate_limiter::can (u32 host) |
316 |
pcg |
1.1 |
{ |
317 |
|
|
iterator i; |
318 |
|
|
|
319 |
|
|
for (i = begin (); i != end (); ) |
320 |
|
|
if (i->host == host) |
321 |
|
|
break; |
322 |
pcg |
1.62 |
else if (i->last < ev_now () - NRL_EXPIRE) |
323 |
pcg |
1.1 |
i = erase (i); |
324 |
|
|
else |
325 |
|
|
i++; |
326 |
|
|
|
327 |
|
|
if (i == end ()) |
328 |
|
|
{ |
329 |
|
|
net_rateinfo ri; |
330 |
|
|
|
331 |
|
|
ri.host = host; |
332 |
|
|
ri.pcnt = 1.; |
333 |
pcg |
1.34 |
ri.diff = NRL_MAXDIF; |
334 |
pcg |
1.62 |
ri.last = ev_now (); |
335 |
pcg |
1.1 |
|
336 |
|
|
push_front (ri); |
337 |
|
|
|
338 |
|
|
return true; |
339 |
|
|
} |
340 |
|
|
else |
341 |
|
|
{ |
342 |
|
|
net_rateinfo ri (*i); |
343 |
|
|
erase (i); |
344 |
|
|
|
345 |
pcg |
1.34 |
ri.pcnt = ri.pcnt * NRL_ALPHA; |
346 |
pcg |
1.62 |
ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
347 |
pcg |
1.1 |
|
348 |
pcg |
1.62 |
ri.last = ev_now (); |
349 |
pcg |
1.1 |
|
350 |
pcg |
1.10 |
double dif = ri.diff / ri.pcnt; |
351 |
pcg |
1.1 |
|
352 |
pcg |
1.34 |
bool send = dif > NRL_CUTOFF; |
353 |
pcg |
1.10 |
|
354 |
pcg |
1.34 |
if (dif > NRL_MAXDIF) |
355 |
pcg |
1.10 |
{ |
356 |
|
|
ri.pcnt = 1.; |
357 |
pcg |
1.34 |
ri.diff = NRL_MAXDIF; |
358 |
pcg |
1.10 |
} |
359 |
|
|
else if (send) |
360 |
pcg |
1.1 |
ri.pcnt++; |
361 |
|
|
|
362 |
|
|
push_front (ri); |
363 |
|
|
|
364 |
|
|
return send; |
365 |
|
|
} |
366 |
|
|
} |
367 |
|
|
|
368 |
|
|
///////////////////////////////////////////////////////////////////////////// |
369 |
|
|
|
370 |
|
|
unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
371 |
|
|
|
372 |
root |
1.90 |
void |
373 |
|
|
hmac_packet::hmac_gen (crypto_ctx *ctx) |
374 |
pcg |
1.1 |
{ |
375 |
|
|
unsigned int xlen; |
376 |
|
|
|
377 |
|
|
HMAC_CTX *hctx = &ctx->hctx; |
378 |
|
|
|
379 |
|
|
HMAC_Init_ex (hctx, 0, 0, 0, 0); |
380 |
|
|
HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
381 |
|
|
len - sizeof (hmac_packet)); |
382 |
|
|
HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
383 |
|
|
} |
384 |
|
|
|
385 |
|
|
void |
386 |
|
|
hmac_packet::hmac_set (crypto_ctx *ctx) |
387 |
|
|
{ |
388 |
|
|
hmac_gen (ctx); |
389 |
|
|
|
390 |
|
|
memcpy (hmac, hmac_digest, HMACLENGTH); |
391 |
|
|
} |
392 |
|
|
|
393 |
|
|
bool |
394 |
|
|
hmac_packet::hmac_chk (crypto_ctx *ctx) |
395 |
|
|
{ |
396 |
|
|
hmac_gen (ctx); |
397 |
|
|
|
398 |
|
|
return !memcmp (hmac, hmac_digest, HMACLENGTH); |
399 |
|
|
} |
400 |
|
|
|
401 |
root |
1.90 |
void |
402 |
|
|
vpn_packet::set_hdr (ptype type_, unsigned int dst) |
403 |
pcg |
1.1 |
{ |
404 |
pcg |
1.6 |
type = type_; |
405 |
pcg |
1.1 |
|
406 |
|
|
int src = THISNODE->id; |
407 |
|
|
|
408 |
|
|
src1 = src; |
409 |
|
|
srcdst = ((src >> 8) << 4) | (dst >> 8); |
410 |
|
|
dst1 = dst; |
411 |
|
|
} |
412 |
|
|
|
413 |
|
|
#define MAXVPNDATA (MAX_MTU - 6 - 6) |
414 |
|
|
#define DATAHDR (sizeof (u32) + RAND_SIZE) |
415 |
|
|
|
416 |
pcg |
1.28 |
struct vpndata_packet : vpn_packet |
417 |
root |
1.90 |
{ |
418 |
|
|
u8 data[MAXVPNDATA + DATAHDR]; // seqno |
419 |
|
|
|
420 |
|
|
void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
421 |
|
|
tap_packet *unpack (connection *conn, u32 &seqno); |
422 |
pcg |
1.1 |
|
423 |
|
|
private: |
424 |
root |
1.90 |
const u32 data_hdr_size () const |
425 |
|
|
{ |
426 |
|
|
return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
427 |
|
|
} |
428 |
|
|
}; |
429 |
pcg |
1.1 |
|
430 |
|
|
void |
431 |
|
|
vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
432 |
|
|
{ |
433 |
|
|
EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
434 |
|
|
int outl = 0, outl2; |
435 |
|
|
ptype type = PT_DATA_UNCOMPRESSED; |
436 |
|
|
|
437 |
|
|
#if ENABLE_COMPRESSION |
438 |
|
|
u8 cdata[MAX_MTU]; |
439 |
|
|
|
440 |
pcg |
1.86 |
if (conn->features & FEATURE_COMPRESSION) |
441 |
pcg |
1.1 |
{ |
442 |
pcg |
1.31 |
u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
443 |
pcg |
1.1 |
|
444 |
pcg |
1.31 |
if (cl) |
445 |
|
|
{ |
446 |
|
|
type = PT_DATA_COMPRESSED; |
447 |
|
|
d = cdata; |
448 |
|
|
l = cl + 2; |
449 |
|
|
|
450 |
|
|
d[0] = cl >> 8; |
451 |
|
|
d[1] = cl; |
452 |
|
|
} |
453 |
pcg |
1.1 |
} |
454 |
|
|
#endif |
455 |
|
|
|
456 |
pcg |
1.29 |
require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
457 |
pcg |
1.1 |
|
458 |
|
|
struct { |
459 |
|
|
#if RAND_SIZE |
460 |
|
|
u8 rnd[RAND_SIZE]; |
461 |
|
|
#endif |
462 |
|
|
u32 seqno; |
463 |
|
|
} datahdr; |
464 |
|
|
|
465 |
|
|
datahdr.seqno = ntohl (seqno); |
466 |
|
|
#if RAND_SIZE |
467 |
|
|
RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
468 |
|
|
#endif |
469 |
|
|
|
470 |
pcg |
1.29 |
require (EVP_EncryptUpdate (cctx, |
471 |
pcg |
1.1 |
(unsigned char *) data + outl, &outl2, |
472 |
pcg |
1.29 |
(unsigned char *) &datahdr, DATAHDR)); |
473 |
pcg |
1.1 |
outl += outl2; |
474 |
|
|
|
475 |
pcg |
1.29 |
require (EVP_EncryptUpdate (cctx, |
476 |
pcg |
1.1 |
(unsigned char *) data + outl, &outl2, |
477 |
pcg |
1.29 |
(unsigned char *) d, l)); |
478 |
pcg |
1.1 |
outl += outl2; |
479 |
|
|
|
480 |
pcg |
1.29 |
require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
481 |
pcg |
1.1 |
outl += outl2; |
482 |
|
|
|
483 |
|
|
len = outl + data_hdr_size (); |
484 |
|
|
|
485 |
|
|
set_hdr (type, dst); |
486 |
|
|
|
487 |
|
|
hmac_set (conn->octx); |
488 |
|
|
} |
489 |
|
|
|
490 |
|
|
tap_packet * |
491 |
|
|
vpndata_packet::unpack (connection *conn, u32 &seqno) |
492 |
|
|
{ |
493 |
|
|
EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
494 |
|
|
int outl = 0, outl2; |
495 |
|
|
tap_packet *p = new tap_packet; |
496 |
|
|
u8 *d; |
497 |
|
|
u32 l = len - data_hdr_size (); |
498 |
|
|
|
499 |
pcg |
1.29 |
require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
500 |
pcg |
1.1 |
|
501 |
|
|
#if ENABLE_COMPRESSION |
502 |
|
|
u8 cdata[MAX_MTU]; |
503 |
|
|
|
504 |
|
|
if (type == PT_DATA_COMPRESSED) |
505 |
|
|
d = cdata; |
506 |
|
|
else |
507 |
|
|
#endif |
508 |
|
|
d = &(*p)[6 + 6 - DATAHDR]; |
509 |
|
|
|
510 |
|
|
/* this overwrites part of the src mac, but we fix that later */ |
511 |
pcg |
1.29 |
require (EVP_DecryptUpdate (cctx, |
512 |
pcg |
1.1 |
d, &outl2, |
513 |
pcg |
1.29 |
(unsigned char *)&data, len - data_hdr_size ())); |
514 |
pcg |
1.1 |
outl += outl2; |
515 |
|
|
|
516 |
pcg |
1.29 |
require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
517 |
pcg |
1.1 |
outl += outl2; |
518 |
|
|
|
519 |
|
|
seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
520 |
|
|
|
521 |
|
|
id2mac (dst () ? dst() : THISNODE->id, p->dst); |
522 |
|
|
id2mac (src (), p->src); |
523 |
|
|
|
524 |
|
|
#if ENABLE_COMPRESSION |
525 |
|
|
if (type == PT_DATA_COMPRESSED) |
526 |
|
|
{ |
527 |
|
|
u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
528 |
|
|
|
529 |
|
|
p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0, |
530 |
|
|
&(*p)[6 + 6], MAX_MTU) |
531 |
|
|
+ 6 + 6; |
532 |
|
|
} |
533 |
|
|
else |
534 |
|
|
p->len = outl + (6 + 6 - DATAHDR); |
535 |
|
|
#endif |
536 |
|
|
|
537 |
|
|
return p; |
538 |
|
|
} |
539 |
|
|
|
540 |
|
|
struct ping_packet : vpn_packet |
541 |
|
|
{ |
542 |
|
|
void setup (int dst, ptype type) |
543 |
|
|
{ |
544 |
|
|
set_hdr (type, dst); |
545 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
546 |
|
|
} |
547 |
|
|
}; |
548 |
|
|
|
549 |
|
|
struct config_packet : vpn_packet |
550 |
|
|
{ |
551 |
|
|
// actually, hmaclen cannot be checked because the hmac |
552 |
|
|
// field comes before this data, so peers with other |
553 |
|
|
// hmacs simply will not work. |
554 |
|
|
u8 prot_major, prot_minor, randsize, hmaclen; |
555 |
pcg |
1.31 |
u8 flags, challengelen, features, pad3; |
556 |
pcg |
1.1 |
u32 cipher_nid, digest_nid, hmac_nid; |
557 |
|
|
|
558 |
|
|
void setup (ptype type, int dst); |
559 |
|
|
bool chk_config () const; |
560 |
pcg |
1.32 |
|
561 |
|
|
static u8 get_features () |
562 |
|
|
{ |
563 |
|
|
u8 f = 0; |
564 |
|
|
#if ENABLE_COMPRESSION |
565 |
|
|
f |= FEATURE_COMPRESSION; |
566 |
|
|
#endif |
567 |
|
|
#if ENABLE_ROHC |
568 |
|
|
f |= FEATURE_ROHC; |
569 |
|
|
#endif |
570 |
pcg |
1.59 |
#if ENABLE_BRIDGING |
571 |
|
|
f |= FEATURE_BRIDGING; |
572 |
|
|
#endif |
573 |
pcg |
1.32 |
return f; |
574 |
|
|
} |
575 |
pcg |
1.1 |
}; |
576 |
|
|
|
577 |
root |
1.90 |
void |
578 |
|
|
config_packet::setup (ptype type, int dst) |
579 |
pcg |
1.1 |
{ |
580 |
|
|
prot_major = PROTOCOL_MAJOR; |
581 |
|
|
prot_minor = PROTOCOL_MINOR; |
582 |
|
|
randsize = RAND_SIZE; |
583 |
|
|
hmaclen = HMACLENGTH; |
584 |
pcg |
1.48 |
flags = 0; |
585 |
pcg |
1.1 |
challengelen = sizeof (rsachallenge); |
586 |
pcg |
1.32 |
features = get_features (); |
587 |
pcg |
1.1 |
|
588 |
|
|
cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
589 |
|
|
digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
590 |
|
|
hmac_nid = htonl (EVP_MD_type (DIGEST)); |
591 |
|
|
|
592 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
593 |
|
|
set_hdr (type, dst); |
594 |
|
|
} |
595 |
|
|
|
596 |
root |
1.90 |
bool |
597 |
|
|
config_packet::chk_config () const |
598 |
pcg |
1.1 |
{ |
599 |
pcg |
1.15 |
if (prot_major != PROTOCOL_MAJOR) |
600 |
pcg |
1.23 |
slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
601 |
pcg |
1.15 |
else if (randsize != RAND_SIZE) |
602 |
pcg |
1.23 |
slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
603 |
pcg |
1.15 |
else if (hmaclen != HMACLENGTH) |
604 |
pcg |
1.23 |
slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
605 |
pcg |
1.15 |
else if (challengelen != sizeof (rsachallenge)) |
606 |
pcg |
1.23 |
slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
607 |
pcg |
1.15 |
else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
608 |
pcg |
1.23 |
slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
609 |
pcg |
1.15 |
else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
610 |
pcg |
1.23 |
slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
611 |
pcg |
1.15 |
else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
612 |
pcg |
1.23 |
slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
613 |
pcg |
1.15 |
else |
614 |
|
|
return true; |
615 |
|
|
|
616 |
|
|
return false; |
617 |
pcg |
1.1 |
} |
618 |
|
|
|
619 |
|
|
struct auth_req_packet : config_packet |
620 |
|
|
{ |
621 |
|
|
char magic[8]; |
622 |
|
|
u8 initiate; // false if this is just an automatic reply |
623 |
pcg |
1.28 |
u8 protocols; // supported protocols (will be patched on forward) |
624 |
pcg |
1.1 |
u8 pad2, pad3; |
625 |
|
|
rsaid id; |
626 |
|
|
rsaencrdata encr; |
627 |
|
|
|
628 |
|
|
auth_req_packet (int dst, bool initiate_, u8 protocols_) |
629 |
|
|
{ |
630 |
|
|
config_packet::setup (PT_AUTH_REQ, dst); |
631 |
pcg |
1.85 |
strncpy (magic, MAGIC_OLD, 8); |
632 |
pcg |
1.1 |
initiate = !!initiate_; |
633 |
|
|
protocols = protocols_; |
634 |
|
|
|
635 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
636 |
|
|
} |
637 |
|
|
}; |
638 |
|
|
|
639 |
|
|
struct auth_res_packet : config_packet |
640 |
|
|
{ |
641 |
|
|
rsaid id; |
642 |
|
|
u8 pad1, pad2, pad3; |
643 |
|
|
u8 response_len; // encrypted length |
644 |
|
|
rsaresponse response; |
645 |
|
|
|
646 |
|
|
auth_res_packet (int dst) |
647 |
|
|
{ |
648 |
|
|
config_packet::setup (PT_AUTH_RES, dst); |
649 |
|
|
|
650 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
651 |
|
|
} |
652 |
|
|
}; |
653 |
|
|
|
654 |
|
|
struct connect_req_packet : vpn_packet |
655 |
|
|
{ |
656 |
|
|
u8 id, protocols; |
657 |
|
|
u8 pad1, pad2; |
658 |
|
|
|
659 |
|
|
connect_req_packet (int dst, int id_, u8 protocols_) |
660 |
|
|
: id(id_) |
661 |
|
|
, protocols(protocols_) |
662 |
|
|
{ |
663 |
|
|
set_hdr (PT_CONNECT_REQ, dst); |
664 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
665 |
|
|
} |
666 |
|
|
}; |
667 |
|
|
|
668 |
|
|
struct connect_info_packet : vpn_packet |
669 |
|
|
{ |
670 |
|
|
u8 id, protocols; |
671 |
|
|
u8 pad1, pad2; |
672 |
|
|
sockinfo si; |
673 |
|
|
|
674 |
|
|
connect_info_packet (int dst, int id_, const sockinfo &si_, u8 protocols_) |
675 |
|
|
: id(id_) |
676 |
|
|
, protocols(protocols_) |
677 |
|
|
, si(si_) |
678 |
|
|
{ |
679 |
|
|
set_hdr (PT_CONNECT_INFO, dst); |
680 |
|
|
|
681 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
682 |
|
|
} |
683 |
|
|
}; |
684 |
|
|
|
685 |
|
|
///////////////////////////////////////////////////////////////////////////// |
686 |
|
|
|
687 |
|
|
void |
688 |
pcg |
1.10 |
connection::connection_established () |
689 |
|
|
{ |
690 |
pcg |
1.79 |
slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
691 |
pcg |
1.61 |
|
692 |
pcg |
1.10 |
if (ictx && octx) |
693 |
|
|
{ |
694 |
pcg |
1.36 |
// make sure rekeying timeouts are slightly asymmetric |
695 |
pcg |
1.60 |
ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
696 |
|
|
rekey.start (rekey_interval, rekey_interval); |
697 |
root |
1.97 |
|
698 |
pcg |
1.60 |
keepalive.start (::conf.keepalive); |
699 |
pcg |
1.10 |
|
700 |
|
|
// send queued packets |
701 |
|
|
if (ictx && octx) |
702 |
pcg |
1.12 |
{ |
703 |
|
|
while (tap_packet *p = (tap_packet *)data_queue.get ()) |
704 |
|
|
{ |
705 |
pcg |
1.67 |
if (p->len) send_data_packet (p); |
706 |
pcg |
1.12 |
delete p; |
707 |
|
|
} |
708 |
|
|
|
709 |
|
|
while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
710 |
|
|
{ |
711 |
pcg |
1.67 |
if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
712 |
pcg |
1.12 |
delete p; |
713 |
|
|
} |
714 |
|
|
} |
715 |
pcg |
1.73 |
|
716 |
|
|
vpn->connection_established (this); |
717 |
pcg |
1.10 |
} |
718 |
|
|
else |
719 |
|
|
{ |
720 |
|
|
retry_cnt = 0; |
721 |
pcg |
1.60 |
establish_connection.start (5); |
722 |
pcg |
1.25 |
keepalive.stop (); |
723 |
|
|
rekey.stop (); |
724 |
pcg |
1.10 |
} |
725 |
|
|
} |
726 |
|
|
|
727 |
|
|
void |
728 |
pcg |
1.8 |
connection::reset_si () |
729 |
pcg |
1.1 |
{ |
730 |
pcg |
1.73 |
if (vpn->can_direct (THISNODE, conf)) |
731 |
|
|
protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
732 |
|
|
else |
733 |
pcg |
1.59 |
{ |
734 |
pcg |
1.73 |
slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
735 |
pcg |
1.59 |
protocol = 0; |
736 |
|
|
} |
737 |
pcg |
1.6 |
|
738 |
|
|
si.set (conf, protocol); |
739 |
pcg |
1.73 |
|
740 |
|
|
is_direct = si.valid (); |
741 |
pcg |
1.1 |
} |
742 |
|
|
|
743 |
pcg |
1.8 |
// ensure sockinfo is valid, forward if necessary |
744 |
|
|
const sockinfo & |
745 |
|
|
connection::forward_si (const sockinfo &si) const |
746 |
|
|
{ |
747 |
|
|
if (!si.valid ()) |
748 |
|
|
{ |
749 |
pcg |
1.73 |
connection *r = vpn->find_router_for (this); |
750 |
pcg |
1.8 |
|
751 |
|
|
if (r) |
752 |
|
|
{ |
753 |
pcg |
1.73 |
slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
754 |
|
|
conf->nodename, r->conf->nodename); |
755 |
pcg |
1.8 |
return r->si; |
756 |
|
|
} |
757 |
|
|
else |
758 |
pcg |
1.73 |
slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
759 |
pcg |
1.8 |
conf->nodename); |
760 |
|
|
} |
761 |
|
|
|
762 |
|
|
return si; |
763 |
|
|
} |
764 |
|
|
|
765 |
pcg |
1.1 |
void |
766 |
pcg |
1.10 |
connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
767 |
|
|
{ |
768 |
pcg |
1.46 |
if (!vpn->send_vpn_packet (pkt, si, tos)) |
769 |
pcg |
1.10 |
reset_connection (); |
770 |
|
|
} |
771 |
|
|
|
772 |
|
|
void |
773 |
pcg |
1.1 |
connection::send_ping (const sockinfo &si, u8 pong) |
774 |
|
|
{ |
775 |
|
|
ping_packet *pkt = new ping_packet; |
776 |
|
|
|
777 |
|
|
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
778 |
pcg |
1.73 |
|
779 |
pcg |
1.79 |
slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
780 |
pcg |
1.73 |
|
781 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
782 |
pcg |
1.1 |
|
783 |
|
|
delete pkt; |
784 |
|
|
} |
785 |
|
|
|
786 |
|
|
void |
787 |
|
|
connection::send_reset (const sockinfo &si) |
788 |
|
|
{ |
789 |
|
|
if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
790 |
|
|
{ |
791 |
|
|
config_packet *pkt = new config_packet; |
792 |
|
|
|
793 |
|
|
pkt->setup (vpn_packet::PT_RESET, conf->id); |
794 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_MINCOST); |
795 |
pcg |
1.1 |
|
796 |
|
|
delete pkt; |
797 |
|
|
} |
798 |
|
|
} |
799 |
|
|
|
800 |
|
|
void |
801 |
|
|
connection::send_auth_request (const sockinfo &si, bool initiate) |
802 |
|
|
{ |
803 |
|
|
auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
804 |
|
|
|
805 |
pcg |
1.6 |
rsachallenge chg; |
806 |
|
|
rsa_cache.gen (pkt->id, chg); |
807 |
pcg |
1.24 |
rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
808 |
pcg |
1.1 |
|
809 |
pcg |
1.81 |
slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
810 |
pcg |
1.1 |
|
811 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
812 |
pcg |
1.1 |
|
813 |
pcg |
1.6 |
delete pkt; |
814 |
pcg |
1.1 |
} |
815 |
|
|
|
816 |
|
|
void |
817 |
|
|
connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
818 |
|
|
{ |
819 |
|
|
auth_res_packet *pkt = new auth_res_packet (conf->id); |
820 |
|
|
|
821 |
|
|
pkt->id = id; |
822 |
|
|
|
823 |
|
|
rsa_hash (id, chg, pkt->response); |
824 |
|
|
|
825 |
|
|
pkt->hmac_set (octx); |
826 |
|
|
|
827 |
pcg |
1.80 |
slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
828 |
pcg |
1.1 |
|
829 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
830 |
pcg |
1.1 |
|
831 |
|
|
delete pkt; |
832 |
|
|
} |
833 |
|
|
|
834 |
|
|
void |
835 |
|
|
connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
836 |
|
|
{ |
837 |
root |
1.93 |
slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
838 |
|
|
vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
839 |
|
|
conf->protocols); |
840 |
pcg |
1.1 |
|
841 |
|
|
connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
842 |
|
|
|
843 |
|
|
r->hmac_set (octx); |
844 |
pcg |
1.10 |
send_vpn_packet (r, si); |
845 |
pcg |
1.1 |
|
846 |
|
|
delete r; |
847 |
|
|
} |
848 |
|
|
|
849 |
pcg |
1.66 |
inline void |
850 |
pcg |
1.60 |
connection::establish_connection_cb (ev::timer &w, int revents) |
851 |
pcg |
1.1 |
{ |
852 |
root |
1.92 |
if (!(ictx && octx) |
853 |
pcg |
1.25 |
&& conf != THISNODE |
854 |
|
|
&& connectmode != conf_node::C_NEVER |
855 |
|
|
&& connectmode != conf_node::C_DISABLED |
856 |
pcg |
1.60 |
&& !w.is_active ()) |
857 |
pcg |
1.1 |
{ |
858 |
pcg |
1.67 |
// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
859 |
|
|
// and stop trying. should probably be handled by a per-connection expire handler. |
860 |
|
|
if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
861 |
|
|
{ |
862 |
|
|
reset_connection (); |
863 |
|
|
return; |
864 |
|
|
} |
865 |
|
|
|
866 |
pcg |
1.68 |
last_establish_attempt = ev_now (); |
867 |
|
|
|
868 |
pcg |
1.60 |
ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
869 |
|
|
? (retry_cnt & 3) + 1 |
870 |
|
|
: 1 << (retry_cnt >> 2)); |
871 |
pcg |
1.1 |
|
872 |
pcg |
1.47 |
reset_si (); |
873 |
pcg |
1.1 |
|
874 |
pcg |
1.47 |
bool slow = si.prot & PROT_SLOW; |
875 |
pcg |
1.8 |
|
876 |
pcg |
1.73 |
if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
877 |
pcg |
1.60 |
{ |
878 |
|
|
/*TODO*/ /* start the timer so we don't recurse endlessly */ |
879 |
|
|
w.start (1); |
880 |
pcg |
1.74 |
vpn->send_connect_request (this); |
881 |
pcg |
1.60 |
} |
882 |
pcg |
1.8 |
else |
883 |
pcg |
1.1 |
{ |
884 |
pcg |
1.73 |
if (si.valid ()) |
885 |
|
|
slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
886 |
|
|
conf->nodename, (const char *)si); |
887 |
pcg |
1.61 |
|
888 |
pcg |
1.8 |
const sockinfo &dsi = forward_si (si); |
889 |
pcg |
1.6 |
|
890 |
pcg |
1.47 |
slow = slow || (dsi.prot & PROT_SLOW); |
891 |
|
|
|
892 |
pcg |
1.8 |
if (dsi.valid () && auth_rate_limiter.can (dsi)) |
893 |
|
|
{ |
894 |
|
|
if (retry_cnt < 4) |
895 |
|
|
send_auth_request (dsi, true); |
896 |
|
|
else |
897 |
|
|
send_ping (dsi, 0); |
898 |
|
|
} |
899 |
pcg |
1.1 |
} |
900 |
pcg |
1.47 |
|
901 |
pcg |
1.68 |
retry_int *= slow ? 8. : 0.9; |
902 |
pcg |
1.47 |
|
903 |
|
|
if (retry_int < conf->max_retry) |
904 |
|
|
retry_cnt++; |
905 |
|
|
else |
906 |
|
|
retry_int = conf->max_retry; |
907 |
|
|
|
908 |
pcg |
1.60 |
w.start (retry_int); |
909 |
pcg |
1.1 |
} |
910 |
|
|
} |
911 |
|
|
|
912 |
|
|
void |
913 |
|
|
connection::reset_connection () |
914 |
|
|
{ |
915 |
|
|
if (ictx && octx) |
916 |
|
|
{ |
917 |
|
|
slog (L_INFO, _("%s(%s): connection lost"), |
918 |
|
|
conf->nodename, (const char *)si); |
919 |
|
|
|
920 |
|
|
if (::conf.script_node_down) |
921 |
pcg |
1.64 |
{ |
922 |
pcg |
1.70 |
run_script_cb *cb = new run_script_cb; |
923 |
|
|
cb->set<connection, &connection::script_node_down> (this); |
924 |
|
|
run_script_queued (cb, _("node-down command execution failed, continuing.")); |
925 |
pcg |
1.64 |
} |
926 |
pcg |
1.1 |
} |
927 |
|
|
|
928 |
|
|
delete ictx; ictx = 0; |
929 |
|
|
delete octx; octx = 0; |
930 |
|
|
|
931 |
pcg |
1.38 |
si.host = 0; |
932 |
pcg |
1.1 |
|
933 |
pcg |
1.73 |
last_activity = 0.; |
934 |
|
|
//last_si_change = 0.; |
935 |
pcg |
1.1 |
retry_cnt = 0; |
936 |
|
|
|
937 |
pcg |
1.25 |
rekey.stop (); |
938 |
|
|
keepalive.stop (); |
939 |
|
|
establish_connection.stop (); |
940 |
pcg |
1.1 |
} |
941 |
|
|
|
942 |
|
|
void |
943 |
|
|
connection::shutdown () |
944 |
|
|
{ |
945 |
|
|
if (ictx && octx) |
946 |
|
|
send_reset (si); |
947 |
|
|
|
948 |
|
|
reset_connection (); |
949 |
|
|
} |
950 |
|
|
|
951 |
pcg |
1.73 |
// poor-man's rekeying |
952 |
pcg |
1.66 |
inline void |
953 |
pcg |
1.60 |
connection::rekey_cb (ev::timer &w, int revents) |
954 |
pcg |
1.1 |
{ |
955 |
|
|
reset_connection (); |
956 |
|
|
establish_connection (); |
957 |
|
|
} |
958 |
|
|
|
959 |
|
|
void |
960 |
pcg |
1.21 |
connection::send_data_packet (tap_packet *pkt) |
961 |
pcg |
1.1 |
{ |
962 |
|
|
vpndata_packet *p = new vpndata_packet; |
963 |
|
|
int tos = 0; |
964 |
|
|
|
965 |
pcg |
1.12 |
// I am not hilarious about peeking into packets, but so be it. |
966 |
pcg |
1.21 |
if (conf->inherit_tos && pkt->is_ipv4 ()) |
967 |
pcg |
1.1 |
tos = (*pkt)[15] & IPTOS_TOS_MASK; |
968 |
|
|
|
969 |
pcg |
1.21 |
p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
970 |
pcg |
1.10 |
send_vpn_packet (p, si, tos); |
971 |
pcg |
1.1 |
|
972 |
|
|
delete p; |
973 |
|
|
|
974 |
|
|
if (oseqno > MAX_SEQNO) |
975 |
|
|
rekey (); |
976 |
|
|
} |
977 |
|
|
|
978 |
|
|
void |
979 |
pcg |
1.68 |
connection::post_inject_queue () |
980 |
|
|
{ |
981 |
|
|
// force a connection every now and when when packets are sent (max 1/s) |
982 |
|
|
if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
983 |
|
|
establish_connection.stop (); |
984 |
|
|
|
985 |
|
|
establish_connection (); |
986 |
|
|
} |
987 |
|
|
|
988 |
|
|
void |
989 |
|
|
connection::inject_data_packet (tap_packet *pkt) |
990 |
pcg |
1.1 |
{ |
991 |
|
|
if (ictx && octx) |
992 |
pcg |
1.21 |
send_data_packet (pkt); |
993 |
pcg |
1.1 |
else |
994 |
|
|
{ |
995 |
pcg |
1.68 |
data_queue.put (new tap_packet (*pkt)); |
996 |
|
|
post_inject_queue (); |
997 |
pcg |
1.1 |
} |
998 |
|
|
} |
999 |
|
|
|
1000 |
root |
1.90 |
void |
1001 |
|
|
connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1002 |
pcg |
1.8 |
{ |
1003 |
|
|
if (ictx && octx) |
1004 |
pcg |
1.10 |
send_vpn_packet (pkt, si, tos); |
1005 |
pcg |
1.8 |
else |
1006 |
pcg |
1.12 |
{ |
1007 |
pcg |
1.28 |
vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
1008 |
pcg |
1.68 |
post_inject_queue (); |
1009 |
pcg |
1.12 |
} |
1010 |
pcg |
1.8 |
} |
1011 |
|
|
|
1012 |
pcg |
1.1 |
void |
1013 |
|
|
connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1014 |
|
|
{ |
1015 |
pcg |
1.62 |
last_activity = ev_now (); |
1016 |
pcg |
1.1 |
|
1017 |
root |
1.91 |
slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
1018 |
pcg |
1.79 |
conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
1019 |
pcg |
1.1 |
|
1020 |
pcg |
1.61 |
if (connectmode == conf_node::C_DISABLED) |
1021 |
|
|
return; |
1022 |
|
|
|
1023 |
pcg |
1.1 |
switch (pkt->typ ()) |
1024 |
|
|
{ |
1025 |
pcg |
1.3 |
case vpn_packet::PT_PING: |
1026 |
pcg |
1.79 |
slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
1027 |
|
|
|
1028 |
pcg |
1.3 |
// we send pings instead of auth packets after some retries, |
1029 |
|
|
// so reset the retry counter and establish a connection |
1030 |
|
|
// when we receive a ping. |
1031 |
root |
1.89 |
if (!ictx) |
1032 |
pcg |
1.3 |
{ |
1033 |
|
|
if (auth_rate_limiter.can (rsi)) |
1034 |
|
|
send_auth_request (rsi, true); |
1035 |
|
|
} |
1036 |
|
|
else |
1037 |
root |
1.89 |
// we would love to change the socket address here, but ping's aren't |
1038 |
pcg |
1.73 |
// authenticated, so we best ignore it. |
1039 |
pcg |
1.3 |
send_ping (rsi, 1); // pong |
1040 |
|
|
|
1041 |
|
|
break; |
1042 |
|
|
|
1043 |
|
|
case vpn_packet::PT_PONG: |
1044 |
pcg |
1.79 |
slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
1045 |
root |
1.89 |
|
1046 |
|
|
// a PONG might mean that the other side doesn't really know |
1047 |
|
|
// about our desire for communication. |
1048 |
|
|
establish_connection (); |
1049 |
pcg |
1.3 |
break; |
1050 |
|
|
|
1051 |
|
|
case vpn_packet::PT_RESET: |
1052 |
pcg |
1.1 |
{ |
1053 |
pcg |
1.3 |
reset_connection (); |
1054 |
|
|
|
1055 |
|
|
config_packet *p = (config_packet *) pkt; |
1056 |
|
|
|
1057 |
|
|
if (!p->chk_config ()) |
1058 |
|
|
{ |
1059 |
pcg |
1.73 |
slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
1060 |
pcg |
1.3 |
conf->nodename, (const char *)rsi); |
1061 |
|
|
connectmode = conf_node::C_DISABLED; |
1062 |
|
|
} |
1063 |
|
|
else if (connectmode == conf_node::C_ALWAYS) |
1064 |
|
|
establish_connection (); |
1065 |
pcg |
1.1 |
} |
1066 |
pcg |
1.3 |
break; |
1067 |
|
|
|
1068 |
|
|
case vpn_packet::PT_AUTH_REQ: |
1069 |
|
|
if (auth_rate_limiter.can (rsi)) |
1070 |
|
|
{ |
1071 |
root |
1.93 |
auth_req_packet *p = (auth_req_packet *)pkt; |
1072 |
pcg |
1.3 |
|
1073 |
root |
1.93 |
slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
1074 |
|
|
conf->nodename, p->initiate ? "initiate" : "reply", |
1075 |
|
|
p->protocols, p->features); |
1076 |
pcg |
1.1 |
|
1077 |
pcg |
1.85 |
if (p->chk_config () |
1078 |
root |
1.93 |
&& (!memcmp (p->magic, MAGIC_OLD, 8) || !memcmp (p->magic, MAGIC, 8))) |
1079 |
pcg |
1.3 |
{ |
1080 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
1081 |
|
|
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1082 |
|
|
conf->nodename, (const char *)rsi, |
1083 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1084 |
|
|
|
1085 |
|
|
if (p->initiate) |
1086 |
|
|
send_auth_request (rsi, false); |
1087 |
|
|
|
1088 |
|
|
rsachallenge k; |
1089 |
|
|
|
1090 |
pcg |
1.24 |
if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
1091 |
pcg |
1.23 |
{ |
1092 |
|
|
slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1093 |
|
|
conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1094 |
|
|
break; |
1095 |
|
|
} |
1096 |
pcg |
1.3 |
else |
1097 |
|
|
{ |
1098 |
|
|
delete octx; |
1099 |
pcg |
1.1 |
|
1100 |
pcg |
1.3 |
octx = new crypto_ctx (k, 1); |
1101 |
|
|
oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1102 |
pcg |
1.1 |
|
1103 |
pcg |
1.3 |
conf->protocols = p->protocols; |
1104 |
pcg |
1.32 |
features = p->features & config_packet::get_features (); |
1105 |
pcg |
1.10 |
|
1106 |
pcg |
1.3 |
send_auth_response (rsi, p->id, k); |
1107 |
|
|
|
1108 |
pcg |
1.10 |
connection_established (); |
1109 |
|
|
|
1110 |
pcg |
1.3 |
break; |
1111 |
|
|
} |
1112 |
|
|
} |
1113 |
pcg |
1.15 |
else |
1114 |
pcg |
1.73 |
slog (L_WARN, _("%s(%s): protocol mismatch."), |
1115 |
pcg |
1.15 |
conf->nodename, (const char *)rsi); |
1116 |
pcg |
1.3 |
|
1117 |
|
|
send_reset (rsi); |
1118 |
pcg |
1.1 |
} |
1119 |
|
|
|
1120 |
pcg |
1.3 |
break; |
1121 |
|
|
|
1122 |
|
|
case vpn_packet::PT_AUTH_RES: |
1123 |
pcg |
1.1 |
{ |
1124 |
pcg |
1.79 |
auth_res_packet *p = (auth_res_packet *)pkt; |
1125 |
pcg |
1.1 |
|
1126 |
pcg |
1.81 |
slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
1127 |
pcg |
1.1 |
|
1128 |
pcg |
1.3 |
if (p->chk_config ()) |
1129 |
pcg |
1.1 |
{ |
1130 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
1131 |
|
|
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1132 |
|
|
conf->nodename, (const char *)rsi, |
1133 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1134 |
|
|
|
1135 |
pcg |
1.3 |
rsachallenge chg; |
1136 |
pcg |
1.1 |
|
1137 |
pcg |
1.3 |
if (!rsa_cache.find (p->id, chg)) |
1138 |
pcg |
1.13 |
{ |
1139 |
pcg |
1.73 |
slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
1140 |
pcg |
1.13 |
conf->nodename, (const char *)rsi); |
1141 |
|
|
break; |
1142 |
|
|
} |
1143 |
pcg |
1.1 |
else |
1144 |
|
|
{ |
1145 |
pcg |
1.3 |
crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1146 |
|
|
|
1147 |
|
|
if (!p->hmac_chk (cctx)) |
1148 |
pcg |
1.18 |
{ |
1149 |
|
|
slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1150 |
pcg |
1.73 |
"could be an attack, or just corruption or a synchronization error."), |
1151 |
pcg |
1.18 |
conf->nodename, (const char *)rsi); |
1152 |
|
|
break; |
1153 |
|
|
} |
1154 |
pcg |
1.3 |
else |
1155 |
|
|
{ |
1156 |
|
|
rsaresponse h; |
1157 |
|
|
|
1158 |
|
|
rsa_hash (p->id, chg, h); |
1159 |
|
|
|
1160 |
|
|
if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
1161 |
|
|
{ |
1162 |
|
|
prot_minor = p->prot_minor; |
1163 |
|
|
|
1164 |
|
|
delete ictx; ictx = cctx; |
1165 |
|
|
|
1166 |
|
|
iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1167 |
|
|
|
1168 |
|
|
si = rsi; |
1169 |
pcg |
1.7 |
protocol = rsi.prot; |
1170 |
pcg |
1.3 |
|
1171 |
pcg |
1.76 |
slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
1172 |
pcg |
1.3 |
conf->nodename, (const char *)rsi, |
1173 |
pcg |
1.82 |
is_direct ? "direct" : "forwarded", |
1174 |
pcg |
1.3 |
p->prot_major, p->prot_minor); |
1175 |
pcg |
1.1 |
|
1176 |
pcg |
1.73 |
connection_established (); |
1177 |
|
|
|
1178 |
pcg |
1.3 |
if (::conf.script_node_up) |
1179 |
pcg |
1.64 |
{ |
1180 |
pcg |
1.70 |
run_script_cb *cb = new run_script_cb; |
1181 |
|
|
cb->set<connection, &connection::script_node_up> (this); |
1182 |
|
|
run_script_queued (cb, _("node-up command execution failed, continuing.")); |
1183 |
pcg |
1.64 |
} |
1184 |
pcg |
1.1 |
|
1185 |
pcg |
1.3 |
break; |
1186 |
|
|
} |
1187 |
|
|
else |
1188 |
pcg |
1.73 |
slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
1189 |
pcg |
1.3 |
conf->nodename, (const char *)rsi); |
1190 |
|
|
} |
1191 |
pcg |
1.1 |
|
1192 |
pcg |
1.3 |
delete cctx; |
1193 |
pcg |
1.1 |
} |
1194 |
|
|
} |
1195 |
|
|
} |
1196 |
|
|
|
1197 |
pcg |
1.3 |
send_reset (rsi); |
1198 |
|
|
break; |
1199 |
pcg |
1.1 |
|
1200 |
pcg |
1.3 |
case vpn_packet::PT_DATA_COMPRESSED: |
1201 |
|
|
#if !ENABLE_COMPRESSION |
1202 |
|
|
send_reset (rsi); |
1203 |
|
|
break; |
1204 |
|
|
#endif |
1205 |
pcg |
1.1 |
|
1206 |
pcg |
1.3 |
case vpn_packet::PT_DATA_UNCOMPRESSED: |
1207 |
pcg |
1.1 |
|
1208 |
pcg |
1.3 |
if (ictx && octx) |
1209 |
pcg |
1.1 |
{ |
1210 |
pcg |
1.3 |
vpndata_packet *p = (vpndata_packet *)pkt; |
1211 |
pcg |
1.1 |
|
1212 |
pcg |
1.10 |
if (!p->hmac_chk (ictx)) |
1213 |
|
|
slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1214 |
pcg |
1.73 |
"could be an attack, or just corruption or a synchronization error."), |
1215 |
pcg |
1.10 |
conf->nodename, (const char *)rsi); |
1216 |
|
|
else |
1217 |
pcg |
1.1 |
{ |
1218 |
pcg |
1.10 |
u32 seqno; |
1219 |
|
|
tap_packet *d = p->unpack (this, seqno); |
1220 |
pcg |
1.73 |
int seqclass = iseqno.seqno_classify (seqno); |
1221 |
pcg |
1.10 |
|
1222 |
pcg |
1.73 |
if (seqclass == 0) // ok |
1223 |
pcg |
1.1 |
{ |
1224 |
pcg |
1.10 |
vpn->tap->send (d); |
1225 |
pcg |
1.1 |
|
1226 |
pcg |
1.10 |
if (si != rsi) |
1227 |
pcg |
1.1 |
{ |
1228 |
pcg |
1.56 |
// fast re-sync on source address changes, useful especially for tcp/ip |
1229 |
pcg |
1.73 |
//if (last_si_change < ev_now () + 5.) |
1230 |
|
|
// { |
1231 |
pcg |
1.78 |
slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1232 |
|
|
conf->nodename, (const char *)si, (const char *)rsi); |
1233 |
|
|
|
1234 |
pcg |
1.73 |
si = rsi; |
1235 |
pcg |
1.84 |
|
1236 |
|
|
if (::conf.script_node_change) |
1237 |
|
|
{ |
1238 |
|
|
run_script_cb *cb = new run_script_cb; |
1239 |
|
|
cb->set<connection, &connection::script_node_change> (this); |
1240 |
|
|
run_script_queued (cb, _("node-change command execution failed, continuing.")); |
1241 |
|
|
} |
1242 |
|
|
|
1243 |
pcg |
1.73 |
// } |
1244 |
|
|
//else |
1245 |
|
|
// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
1246 |
|
|
// conf->nodename, (const char *)si, (const char *)rsi); |
1247 |
pcg |
1.10 |
} |
1248 |
pcg |
1.32 |
} |
1249 |
pcg |
1.75 |
else if (seqclass == 1) // far history |
1250 |
|
|
slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
1251 |
|
|
"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
1252 |
|
|
else if (seqclass == 2) // in-window duplicate, happens often on wireless |
1253 |
|
|
slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
1254 |
|
|
"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
1255 |
|
|
else if (seqclass == 3) // reset |
1256 |
pcg |
1.73 |
{ |
1257 |
pcg |
1.75 |
slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
1258 |
|
|
"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
1259 |
pcg |
1.73 |
send_reset (rsi); |
1260 |
|
|
} |
1261 |
pcg |
1.3 |
|
1262 |
pcg |
1.32 |
delete d; |
1263 |
|
|
break; |
1264 |
pcg |
1.1 |
} |
1265 |
|
|
} |
1266 |
|
|
|
1267 |
pcg |
1.3 |
send_reset (rsi); |
1268 |
|
|
break; |
1269 |
pcg |
1.1 |
|
1270 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_REQ: |
1271 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1272 |
|
|
{ |
1273 |
pcg |
1.84 |
connect_req_packet *p = (connect_req_packet *)pkt; |
1274 |
pcg |
1.1 |
|
1275 |
pcg |
1.57 |
if (p->id > 0 && p->id <= vpn->conns.size ()) |
1276 |
|
|
{ |
1277 |
|
|
connection *c = vpn->conns[p->id - 1]; |
1278 |
|
|
conf->protocols = p->protocols; |
1279 |
pcg |
1.1 |
|
1280 |
root |
1.93 |
slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
1281 |
|
|
conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
1282 |
|
|
p->protocols, |
1283 |
|
|
c->ictx && c->octx); |
1284 |
pcg |
1.1 |
|
1285 |
pcg |
1.57 |
if (c->ictx && c->octx) |
1286 |
|
|
{ |
1287 |
|
|
// send connect_info packets to both sides, in case one is |
1288 |
|
|
// behind a nat firewall (or both ;) |
1289 |
|
|
c->send_connect_info (conf->id, si, conf->protocols); |
1290 |
|
|
send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1291 |
|
|
} |
1292 |
|
|
else |
1293 |
|
|
c->establish_connection (); |
1294 |
pcg |
1.3 |
} |
1295 |
pcg |
1.11 |
else |
1296 |
pcg |
1.57 |
slog (L_WARN, |
1297 |
|
|
_("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1298 |
|
|
p->id); |
1299 |
pcg |
1.3 |
} |
1300 |
pcg |
1.1 |
|
1301 |
pcg |
1.3 |
break; |
1302 |
pcg |
1.1 |
|
1303 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_INFO: |
1304 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1305 |
|
|
{ |
1306 |
pcg |
1.39 |
connect_info_packet *p = (connect_info_packet *)pkt; |
1307 |
pcg |
1.1 |
|
1308 |
pcg |
1.57 |
if (p->id > 0 && p->id <= vpn->conns.size ()) |
1309 |
pcg |
1.39 |
{ |
1310 |
|
|
connection *c = vpn->conns[p->id - 1]; |
1311 |
pcg |
1.7 |
|
1312 |
pcg |
1.39 |
c->conf->protocols = p->protocols; |
1313 |
|
|
protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1314 |
|
|
p->si.upgrade_protocol (protocol, c->conf); |
1315 |
pcg |
1.1 |
|
1316 |
root |
1.96 |
slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1317 |
root |
1.93 |
conf->nodename, |
1318 |
|
|
vpn->conns[p->id - 1]->conf->nodename, |
1319 |
|
|
(const char *)p->si, |
1320 |
|
|
p->protocols, |
1321 |
root |
1.96 |
protocol, |
1322 |
|
|
p->si.supported_protocols (c->conf), |
1323 |
root |
1.93 |
!c->ictx && !c->octx); |
1324 |
pcg |
1.7 |
|
1325 |
pcg |
1.39 |
const sockinfo &dsi = forward_si (p->si); |
1326 |
pcg |
1.1 |
|
1327 |
pcg |
1.39 |
if (dsi.valid ()) |
1328 |
|
|
c->send_auth_request (dsi, true); |
1329 |
root |
1.96 |
else |
1330 |
|
|
slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
1331 |
|
|
vpn->conns[p->id - 1]->conf->nodename, |
1332 |
|
|
(const char *)p->si); |
1333 |
pcg |
1.39 |
} |
1334 |
pcg |
1.57 |
else |
1335 |
|
|
slog (L_WARN, |
1336 |
|
|
_("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1337 |
|
|
p->id); |
1338 |
pcg |
1.3 |
} |
1339 |
pcg |
1.1 |
|
1340 |
pcg |
1.3 |
break; |
1341 |
pcg |
1.1 |
|
1342 |
pcg |
1.3 |
default: |
1343 |
|
|
send_reset (rsi); |
1344 |
|
|
break; |
1345 |
pcg |
1.1 |
} |
1346 |
|
|
} |
1347 |
|
|
|
1348 |
pcg |
1.66 |
inline void |
1349 |
|
|
connection::keepalive_cb (ev::timer &w, int revents) |
1350 |
pcg |
1.1 |
{ |
1351 |
root |
1.97 |
ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
1352 |
|
|
|
1353 |
|
|
if (when >= 0) |
1354 |
|
|
w.start (when); |
1355 |
|
|
else if (when < -15) |
1356 |
pcg |
1.1 |
{ |
1357 |
|
|
reset_connection (); |
1358 |
|
|
establish_connection (); |
1359 |
|
|
} |
1360 |
|
|
else if (conf->connectmode != conf_node::C_ONDEMAND |
1361 |
|
|
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
1362 |
|
|
{ |
1363 |
root |
1.97 |
w.start (3); |
1364 |
pcg |
1.1 |
send_ping (si); |
1365 |
|
|
} |
1366 |
root |
1.97 |
else if (when >= -10) |
1367 |
pcg |
1.12 |
// hold ondemand connections implicitly a few seconds longer |
1368 |
|
|
// should delete octx, though, or something like that ;) |
1369 |
root |
1.97 |
w.start (when + 10); |
1370 |
pcg |
1.1 |
else |
1371 |
|
|
reset_connection (); |
1372 |
|
|
} |
1373 |
|
|
|
1374 |
root |
1.90 |
void |
1375 |
|
|
connection::send_connect_request (int id) |
1376 |
pcg |
1.1 |
{ |
1377 |
root |
1.93 |
connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1378 |
pcg |
1.1 |
|
1379 |
root |
1.93 |
slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
1380 |
|
|
conf->nodename, vpn->conns[id - 1]->conf->nodename, |
1381 |
|
|
THISNODE->protocols); |
1382 |
pcg |
1.1 |
p->hmac_set (octx); |
1383 |
pcg |
1.10 |
send_vpn_packet (p, si); |
1384 |
pcg |
1.1 |
|
1385 |
|
|
delete p; |
1386 |
|
|
} |
1387 |
|
|
|
1388 |
root |
1.90 |
void |
1389 |
|
|
connection::script_init_env (const char *ext) |
1390 |
pcg |
1.53 |
{ |
1391 |
|
|
char *env; |
1392 |
|
|
asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1393 |
pcg |
1.84 |
asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1394 |
pcg |
1.53 |
asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1395 |
|
|
0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1396 |
pcg |
1.84 |
conf->id & 0xff); putenv (env); |
1397 |
pcg |
1.53 |
} |
1398 |
|
|
|
1399 |
root |
1.90 |
void |
1400 |
|
|
connection::script_init_connect_env () |
1401 |
pcg |
1.1 |
{ |
1402 |
pcg |
1.52 |
vpn->script_init_env (); |
1403 |
pcg |
1.1 |
|
1404 |
|
|
char *env; |
1405 |
pcg |
1.84 |
asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1406 |
|
|
asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1407 |
|
|
asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1408 |
|
|
asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1409 |
|
|
asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1410 |
pcg |
1.1 |
} |
1411 |
|
|
|
1412 |
pcg |
1.66 |
inline const char * |
1413 |
|
|
connection::script_node_up () |
1414 |
pcg |
1.1 |
{ |
1415 |
pcg |
1.53 |
script_init_connect_env (); |
1416 |
pcg |
1.1 |
|
1417 |
pcg |
1.60 |
putenv ((char *)"STATE=up"); |
1418 |
pcg |
1.1 |
|
1419 |
pcg |
1.52 |
char *filename; |
1420 |
|
|
asprintf (&filename, |
1421 |
|
|
"%s/%s", |
1422 |
|
|
confbase, |
1423 |
|
|
::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1424 |
pcg |
1.54 |
|
1425 |
|
|
return filename; |
1426 |
pcg |
1.1 |
} |
1427 |
|
|
|
1428 |
pcg |
1.66 |
inline const char * |
1429 |
pcg |
1.84 |
connection::script_node_change () |
1430 |
|
|
{ |
1431 |
|
|
script_init_connect_env (); |
1432 |
|
|
|
1433 |
|
|
putenv ((char *)"STATE=change"); |
1434 |
|
|
|
1435 |
|
|
char *filename; |
1436 |
|
|
asprintf (&filename, |
1437 |
|
|
"%s/%s", |
1438 |
|
|
confbase, |
1439 |
|
|
::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
1440 |
|
|
|
1441 |
|
|
return filename; |
1442 |
|
|
} |
1443 |
|
|
|
1444 |
|
|
inline const char * |
1445 |
pcg |
1.66 |
connection::script_node_down () |
1446 |
pcg |
1.1 |
{ |
1447 |
pcg |
1.53 |
script_init_connect_env (); |
1448 |
pcg |
1.1 |
|
1449 |
pcg |
1.60 |
putenv ((char *)"STATE=down"); |
1450 |
pcg |
1.1 |
|
1451 |
pcg |
1.52 |
char *filename; |
1452 |
|
|
asprintf (&filename, |
1453 |
|
|
"%s/%s", |
1454 |
|
|
confbase, |
1455 |
|
|
::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1456 |
pcg |
1.54 |
|
1457 |
|
|
return filename; |
1458 |
pcg |
1.1 |
} |
1459 |
|
|
|
1460 |
pcg |
1.40 |
connection::connection (struct vpn *vpn, conf_node *conf) |
1461 |
pcg |
1.67 |
: vpn(vpn), conf(conf), |
1462 |
pcg |
1.40 |
#if ENABLE_DNS |
1463 |
pcg |
1.67 |
dns (0), |
1464 |
pcg |
1.40 |
#endif |
1465 |
pcg |
1.72 |
data_queue(conf->max_ttl, conf->max_queue + 1), |
1466 |
|
|
vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1467 |
pcg |
1.1 |
{ |
1468 |
pcg |
1.65 |
rekey .set<connection, &connection::rekey_cb > (this); |
1469 |
|
|
keepalive .set<connection, &connection::keepalive_cb > (this); |
1470 |
|
|
establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1471 |
|
|
|
1472 |
pcg |
1.68 |
last_establish_attempt = 0.; |
1473 |
pcg |
1.1 |
octx = ictx = 0; |
1474 |
|
|
|
1475 |
pcg |
1.67 |
connectmode = conf->connectmode; |
1476 |
|
|
|
1477 |
|
|
// queue a dummy packet to force an initial connection attempt |
1478 |
|
|
if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1479 |
pcg |
1.68 |
vpn_queue.put (new net_packet); |
1480 |
pcg |
1.67 |
|
1481 |
pcg |
1.1 |
reset_connection (); |
1482 |
|
|
} |
1483 |
|
|
|
1484 |
|
|
connection::~connection () |
1485 |
|
|
{ |
1486 |
|
|
shutdown (); |
1487 |
|
|
} |
1488 |
|
|
|
1489 |
root |
1.90 |
void |
1490 |
|
|
connection_init () |
1491 |
pcg |
1.1 |
{ |
1492 |
|
|
auth_rate_limiter.clear (); |
1493 |
|
|
reset_rate_limiter.clear (); |
1494 |
|
|
} |
1495 |
|
|
|