1 |
pcg |
1.1 |
/* |
2 |
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connection.C -- manage a single connection |
3 |
root |
1.98 |
Copyright (C) 2003-2008,2010,2011,2013 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 |
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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 |
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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 |
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If you modify this Program, or any covered work, by linking or |
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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 |
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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 |
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source code for the parts of OpenSSL used as well as that of the |
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covered work. |
30 |
pcg |
1.1 |
*/ |
31 |
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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 |
root |
1.98 |
#include "hkdf.h" |
49 |
pcg |
1.1 |
|
50 |
pcg |
1.20 |
#include "netcompat.h" |
51 |
pcg |
1.19 |
|
52 |
root |
1.98 |
#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic |
53 |
root |
1.102 |
#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D |
54 |
pcg |
1.30 |
|
55 |
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#define ULTRA_FAST 1 |
56 |
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#define HLOG 15 |
57 |
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#include "lzf/lzf.h" |
58 |
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#include "lzf/lzf_c.c" |
59 |
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#include "lzf/lzf_d.c" |
60 |
pcg |
1.1 |
|
61 |
pcg |
1.70 |
////////////////////////////////////////////////////////////////////////////// |
62 |
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63 |
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static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
64 |
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static ev::child rs_child_ev; |
65 |
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|
66 |
root |
1.90 |
namespace |
67 |
pcg |
1.70 |
{ |
68 |
root |
1.90 |
void // c++ requires external linkage here, apparently :( |
69 |
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rs_child_cb (ev::child &w, int revents) |
70 |
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{ |
71 |
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w.stop (); |
72 |
pcg |
1.70 |
|
73 |
root |
1.90 |
if (rs_queue.empty ()) |
74 |
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return; |
75 |
pcg |
1.70 |
|
76 |
root |
1.90 |
pid_t pid = run_script (*rs_queue.front ().first, false); |
77 |
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if (pid) |
78 |
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{ |
79 |
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w.set (pid); |
80 |
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w.start (); |
81 |
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} |
82 |
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else |
83 |
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slog (L_WARN, rs_queue.front ().second); |
84 |
pcg |
1.70 |
|
85 |
root |
1.90 |
delete rs_queue.front ().first; |
86 |
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rs_queue.pop (); |
87 |
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} |
88 |
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}; |
89 |
pcg |
1.70 |
|
90 |
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// despite the fancy name, this is quite a hack |
91 |
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static void |
92 |
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run_script_queued (run_script_cb *cb, const char *warnmsg) |
93 |
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{ |
94 |
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rs_queue.push (std::make_pair (cb, warnmsg)); |
95 |
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96 |
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if (!rs_child_ev.is_active ()) |
97 |
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{ |
98 |
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rs_child_ev.set<rs_child_cb> (); |
99 |
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rs_child_ev (); |
100 |
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} |
101 |
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} |
102 |
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103 |
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////////////////////////////////////////////////////////////////////////////// |
104 |
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105 |
pcg |
1.1 |
struct crypto_ctx |
106 |
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{ |
107 |
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EVP_CIPHER_CTX cctx; |
108 |
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HMAC_CTX hctx; |
109 |
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110 |
root |
1.98 |
crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc); |
111 |
pcg |
1.1 |
~crypto_ctx (); |
112 |
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}; |
113 |
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114 |
root |
1.98 |
crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc) |
115 |
pcg |
1.1 |
{ |
116 |
root |
1.98 |
ecdh_key s; |
117 |
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118 |
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curve25519_combine (a, b, s); |
119 |
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120 |
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{ |
121 |
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u8 mac_key[MAC_KEYSIZE]; |
122 |
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static const unsigned char mac_info[] = "gvpe mac key"; |
123 |
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124 |
root |
1.99 |
hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
125 |
root |
1.98 |
kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key)); |
126 |
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kdf.extract (s, sizeof (s)); |
127 |
root |
1.99 |
kdf.extract_done (HKDF_PRF_HASH ()); |
128 |
root |
1.98 |
kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info)); |
129 |
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130 |
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HMAC_CTX_init (&hctx); |
131 |
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require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0)); |
132 |
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} |
133 |
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134 |
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{ |
135 |
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u8 cipher_key[CIPHER_KEYSIZE]; |
136 |
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static const unsigned char cipher_info[] = "gvpe cipher key"; |
137 |
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|
138 |
root |
1.99 |
hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
139 |
root |
1.98 |
kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key)); |
140 |
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kdf.extract (s, sizeof (s)); |
141 |
root |
1.99 |
kdf.extract_done (HKDF_PRF_HASH ()); |
142 |
root |
1.98 |
kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info)); |
143 |
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144 |
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EVP_CIPHER_CTX_init (&cctx); |
145 |
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require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc)); |
146 |
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} |
147 |
pcg |
1.1 |
} |
148 |
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149 |
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crypto_ctx::~crypto_ctx () |
150 |
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{ |
151 |
pcg |
1.29 |
require (EVP_CIPHER_CTX_cleanup (&cctx)); |
152 |
pcg |
1.1 |
HMAC_CTX_cleanup (&hctx); |
153 |
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} |
154 |
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155 |
root |
1.98 |
static inline void |
156 |
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auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr) |
157 |
pcg |
1.1 |
{ |
158 |
root |
1.98 |
if (RSA_public_encrypt (sizeof (auth.rsa), |
159 |
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(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa, |
160 |
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key, RSA_PKCS1_OAEP_PADDING) < 0) |
161 |
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fatal ("RSA_public_encrypt error"); |
162 |
root |
1.100 |
|
163 |
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memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh)); |
164 |
pcg |
1.1 |
} |
165 |
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166 |
root |
1.98 |
static inline bool |
167 |
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auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth) |
168 |
pcg |
1.63 |
{ |
169 |
root |
1.98 |
u8 rsa_decrypt[RSA_KEYLEN]; |
170 |
pcg |
1.1 |
|
171 |
root |
1.98 |
if (RSA_private_decrypt (sizeof (encr.rsa), |
172 |
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(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt, |
173 |
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key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa)) |
174 |
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return 0; |
175 |
pcg |
1.1 |
|
176 |
root |
1.98 |
memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa)); |
177 |
root |
1.100 |
memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh)); |
178 |
pcg |
1.1 |
|
179 |
root |
1.98 |
return 1; |
180 |
|
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} |
181 |
pcg |
1.1 |
|
182 |
root |
1.98 |
static void |
183 |
root |
1.104 |
auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac) |
184 |
root |
1.98 |
{ |
185 |
root |
1.104 |
hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt |
186 |
|
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kdf.extract (&auth.rsa, sizeof (auth.rsa)); |
187 |
|
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kdf.extract_done (); |
188 |
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kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info |
189 |
root |
1.98 |
} |
190 |
pcg |
1.1 |
|
191 |
root |
1.90 |
void |
192 |
root |
1.98 |
connection::generate_auth_data () |
193 |
pcg |
1.1 |
{ |
194 |
root |
1.98 |
if (auth_expire < ev_now ()) |
195 |
pcg |
1.1 |
{ |
196 |
root |
1.98 |
// request data |
197 |
root |
1.101 |
rand_fill (snd_auth.rsa); |
198 |
root |
1.98 |
curve25519_generate (snd_ecdh_a, snd_auth.ecdh); |
199 |
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|
200 |
|
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// eventual response data |
201 |
|
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curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); |
202 |
pcg |
1.1 |
} |
203 |
root |
1.98 |
|
204 |
|
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// every use prolongs the expiry |
205 |
|
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auth_expire = ev_now () + AUTH_TTL; |
206 |
pcg |
1.1 |
} |
207 |
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208 |
|
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////////////////////////////////////////////////////////////////////////////// |
209 |
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|
210 |
pcg |
1.67 |
pkt_queue::pkt_queue (double max_ttl, int max_queue) |
211 |
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: max_ttl (max_ttl), max_queue (max_queue) |
212 |
pcg |
1.1 |
{ |
213 |
pcg |
1.67 |
queue = new pkt [max_queue]; |
214 |
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|
215 |
|
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i = 0; |
216 |
|
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j = 0; |
217 |
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|
218 |
|
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expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
219 |
|
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} |
220 |
pcg |
1.1 |
|
221 |
pcg |
1.67 |
pkt_queue::~pkt_queue () |
222 |
|
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{ |
223 |
|
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while (net_packet *p = get ()) |
224 |
|
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delete p; |
225 |
pcg |
1.1 |
|
226 |
pcg |
1.67 |
delete [] queue; |
227 |
pcg |
1.1 |
} |
228 |
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|
229 |
root |
1.90 |
void |
230 |
|
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pkt_queue::expire_cb (ev::timer &w, int revents) |
231 |
pcg |
1.1 |
{ |
232 |
pcg |
1.67 |
ev_tstamp expire = ev_now () - max_ttl; |
233 |
pcg |
1.1 |
|
234 |
pcg |
1.67 |
for (;;) |
235 |
pcg |
1.1 |
{ |
236 |
pcg |
1.67 |
if (empty ()) |
237 |
|
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break; |
238 |
|
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|
239 |
|
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double diff = queue[j].tstamp - expire; |
240 |
|
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|
241 |
|
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if (diff >= 0.) |
242 |
|
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{ |
243 |
|
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w.start (diff > 0.5 ? diff : 0.5); |
244 |
|
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break; |
245 |
|
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} |
246 |
|
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|
247 |
|
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delete get (); |
248 |
pcg |
1.1 |
} |
249 |
|
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} |
250 |
|
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|
251 |
root |
1.90 |
void |
252 |
|
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pkt_queue::put (net_packet *p) |
253 |
pcg |
1.1 |
{ |
254 |
pcg |
1.67 |
ev_tstamp now = ev_now (); |
255 |
|
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|
256 |
|
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// start expiry timer |
257 |
|
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if (empty ()) |
258 |
|
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expire.start (max_ttl); |
259 |
|
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|
260 |
|
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int ni = i + 1 == max_queue ? 0 : i + 1; |
261 |
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|
262 |
|
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if (ni == j) |
263 |
|
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delete get (); |
264 |
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|
265 |
|
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queue[i].pkt = p; |
266 |
|
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queue[i].tstamp = now; |
267 |
|
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|
268 |
|
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i = ni; |
269 |
pcg |
1.1 |
} |
270 |
|
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|
271 |
root |
1.90 |
net_packet * |
272 |
|
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pkt_queue::get () |
273 |
pcg |
1.1 |
{ |
274 |
pcg |
1.67 |
if (empty ()) |
275 |
|
|
return 0; |
276 |
|
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|
277 |
|
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net_packet *p = queue[j].pkt; |
278 |
|
|
queue[j].pkt = 0; |
279 |
|
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|
280 |
|
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j = j + 1 == max_queue ? 0 : j + 1; |
281 |
|
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|
282 |
|
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return p; |
283 |
pcg |
1.1 |
} |
284 |
|
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|
285 |
pcg |
1.63 |
struct net_rateinfo |
286 |
|
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{ |
287 |
pcg |
1.1 |
u32 host; |
288 |
|
|
double pcnt, diff; |
289 |
|
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tstamp last; |
290 |
|
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}; |
291 |
|
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|
292 |
|
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// only do action once every x seconds per host whole allowing bursts. |
293 |
|
|
// this implementation ("splay list" ;) is inefficient, |
294 |
|
|
// but low on resources. |
295 |
|
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struct net_rate_limiter : list<net_rateinfo> |
296 |
|
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{ |
297 |
pcg |
1.35 |
# define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
298 |
|
|
# define NRL_CUTOFF 10. // one event every CUTOFF seconds |
299 |
|
|
# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
300 |
|
|
# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
301 |
pcg |
1.1 |
|
302 |
pcg |
1.16 |
bool can (const sockinfo &si) { return can((u32)si.host); } |
303 |
pcg |
1.1 |
bool can (u32 host); |
304 |
|
|
}; |
305 |
|
|
|
306 |
root |
1.90 |
static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
307 |
pcg |
1.1 |
|
308 |
root |
1.90 |
bool |
309 |
|
|
net_rate_limiter::can (u32 host) |
310 |
pcg |
1.1 |
{ |
311 |
|
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iterator i; |
312 |
|
|
|
313 |
|
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for (i = begin (); i != end (); ) |
314 |
|
|
if (i->host == host) |
315 |
|
|
break; |
316 |
pcg |
1.62 |
else if (i->last < ev_now () - NRL_EXPIRE) |
317 |
pcg |
1.1 |
i = erase (i); |
318 |
|
|
else |
319 |
|
|
i++; |
320 |
|
|
|
321 |
|
|
if (i == end ()) |
322 |
|
|
{ |
323 |
|
|
net_rateinfo ri; |
324 |
|
|
|
325 |
|
|
ri.host = host; |
326 |
|
|
ri.pcnt = 1.; |
327 |
pcg |
1.34 |
ri.diff = NRL_MAXDIF; |
328 |
pcg |
1.62 |
ri.last = ev_now (); |
329 |
pcg |
1.1 |
|
330 |
|
|
push_front (ri); |
331 |
|
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|
332 |
|
|
return true; |
333 |
|
|
} |
334 |
|
|
else |
335 |
|
|
{ |
336 |
|
|
net_rateinfo ri (*i); |
337 |
|
|
erase (i); |
338 |
|
|
|
339 |
pcg |
1.34 |
ri.pcnt = ri.pcnt * NRL_ALPHA; |
340 |
pcg |
1.62 |
ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
341 |
pcg |
1.1 |
|
342 |
pcg |
1.62 |
ri.last = ev_now (); |
343 |
pcg |
1.1 |
|
344 |
pcg |
1.10 |
double dif = ri.diff / ri.pcnt; |
345 |
pcg |
1.1 |
|
346 |
pcg |
1.34 |
bool send = dif > NRL_CUTOFF; |
347 |
pcg |
1.10 |
|
348 |
pcg |
1.34 |
if (dif > NRL_MAXDIF) |
349 |
pcg |
1.10 |
{ |
350 |
|
|
ri.pcnt = 1.; |
351 |
pcg |
1.34 |
ri.diff = NRL_MAXDIF; |
352 |
pcg |
1.10 |
} |
353 |
|
|
else if (send) |
354 |
pcg |
1.1 |
ri.pcnt++; |
355 |
|
|
|
356 |
|
|
push_front (ri); |
357 |
|
|
|
358 |
|
|
return send; |
359 |
|
|
} |
360 |
|
|
} |
361 |
|
|
|
362 |
|
|
///////////////////////////////////////////////////////////////////////////// |
363 |
|
|
|
364 |
root |
1.90 |
void |
365 |
root |
1.104 |
hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest) |
366 |
pcg |
1.1 |
{ |
367 |
|
|
HMAC_CTX *hctx = &ctx->hctx; |
368 |
|
|
|
369 |
root |
1.98 |
require (HMAC_Init_ex (hctx, 0, 0, 0, 0)); |
370 |
root |
1.104 |
require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet))); |
371 |
|
|
require (HMAC_Final (hctx, hmac_digest, 0)); |
372 |
pcg |
1.1 |
} |
373 |
|
|
|
374 |
|
|
void |
375 |
|
|
hmac_packet::hmac_set (crypto_ctx *ctx) |
376 |
|
|
{ |
377 |
root |
1.104 |
unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
378 |
|
|
hmac_gen (ctx, hmac_digest); |
379 |
pcg |
1.1 |
memcpy (hmac, hmac_digest, HMACLENGTH); |
380 |
|
|
} |
381 |
|
|
|
382 |
|
|
bool |
383 |
|
|
hmac_packet::hmac_chk (crypto_ctx *ctx) |
384 |
|
|
{ |
385 |
root |
1.104 |
unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
386 |
|
|
hmac_gen (ctx, hmac_digest); |
387 |
pcg |
1.1 |
return !memcmp (hmac, hmac_digest, HMACLENGTH); |
388 |
|
|
} |
389 |
|
|
|
390 |
root |
1.90 |
void |
391 |
|
|
vpn_packet::set_hdr (ptype type_, unsigned int dst) |
392 |
pcg |
1.1 |
{ |
393 |
pcg |
1.6 |
type = type_; |
394 |
pcg |
1.1 |
|
395 |
|
|
int src = THISNODE->id; |
396 |
|
|
|
397 |
|
|
src1 = src; |
398 |
|
|
srcdst = ((src >> 8) << 4) | (dst >> 8); |
399 |
|
|
dst1 = dst; |
400 |
|
|
} |
401 |
|
|
|
402 |
|
|
#define MAXVPNDATA (MAX_MTU - 6 - 6) |
403 |
|
|
#define DATAHDR (sizeof (u32) + RAND_SIZE) |
404 |
|
|
|
405 |
pcg |
1.28 |
struct vpndata_packet : vpn_packet |
406 |
root |
1.90 |
{ |
407 |
|
|
u8 data[MAXVPNDATA + DATAHDR]; // seqno |
408 |
|
|
|
409 |
|
|
void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
410 |
|
|
tap_packet *unpack (connection *conn, u32 &seqno); |
411 |
pcg |
1.1 |
|
412 |
|
|
private: |
413 |
root |
1.90 |
const u32 data_hdr_size () const |
414 |
|
|
{ |
415 |
|
|
return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
416 |
|
|
} |
417 |
|
|
}; |
418 |
pcg |
1.1 |
|
419 |
|
|
void |
420 |
|
|
vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
421 |
|
|
{ |
422 |
|
|
EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
423 |
|
|
int outl = 0, outl2; |
424 |
|
|
ptype type = PT_DATA_UNCOMPRESSED; |
425 |
|
|
|
426 |
|
|
#if ENABLE_COMPRESSION |
427 |
|
|
u8 cdata[MAX_MTU]; |
428 |
|
|
|
429 |
pcg |
1.86 |
if (conn->features & FEATURE_COMPRESSION) |
430 |
pcg |
1.1 |
{ |
431 |
pcg |
1.31 |
u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
432 |
pcg |
1.1 |
|
433 |
pcg |
1.31 |
if (cl) |
434 |
|
|
{ |
435 |
|
|
type = PT_DATA_COMPRESSED; |
436 |
|
|
d = cdata; |
437 |
|
|
l = cl + 2; |
438 |
|
|
|
439 |
|
|
d[0] = cl >> 8; |
440 |
|
|
d[1] = cl; |
441 |
|
|
} |
442 |
pcg |
1.1 |
} |
443 |
|
|
#endif |
444 |
|
|
|
445 |
root |
1.98 |
require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1)); |
446 |
pcg |
1.1 |
|
447 |
|
|
struct { |
448 |
|
|
#if RAND_SIZE |
449 |
|
|
u8 rnd[RAND_SIZE]; |
450 |
|
|
#endif |
451 |
|
|
u32 seqno; |
452 |
|
|
} datahdr; |
453 |
|
|
|
454 |
|
|
datahdr.seqno = ntohl (seqno); |
455 |
|
|
#if RAND_SIZE |
456 |
root |
1.102 |
// NB: a constant (per session) random prefix |
457 |
|
|
// is likely enough, but we don't take any chances. |
458 |
|
|
conn->oiv.get (datahdr.rnd, RAND_SIZE); |
459 |
pcg |
1.1 |
#endif |
460 |
|
|
|
461 |
pcg |
1.29 |
require (EVP_EncryptUpdate (cctx, |
462 |
pcg |
1.1 |
(unsigned char *) data + outl, &outl2, |
463 |
pcg |
1.29 |
(unsigned char *) &datahdr, DATAHDR)); |
464 |
pcg |
1.1 |
outl += outl2; |
465 |
|
|
|
466 |
pcg |
1.29 |
require (EVP_EncryptUpdate (cctx, |
467 |
pcg |
1.1 |
(unsigned char *) data + outl, &outl2, |
468 |
pcg |
1.29 |
(unsigned char *) d, l)); |
469 |
pcg |
1.1 |
outl += outl2; |
470 |
|
|
|
471 |
pcg |
1.29 |
require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
472 |
pcg |
1.1 |
outl += outl2; |
473 |
|
|
|
474 |
|
|
len = outl + data_hdr_size (); |
475 |
|
|
|
476 |
|
|
set_hdr (type, dst); |
477 |
|
|
|
478 |
|
|
hmac_set (conn->octx); |
479 |
|
|
} |
480 |
|
|
|
481 |
|
|
tap_packet * |
482 |
|
|
vpndata_packet::unpack (connection *conn, u32 &seqno) |
483 |
|
|
{ |
484 |
|
|
EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
485 |
|
|
int outl = 0, outl2; |
486 |
|
|
tap_packet *p = new tap_packet; |
487 |
|
|
u8 *d; |
488 |
|
|
u32 l = len - data_hdr_size (); |
489 |
|
|
|
490 |
root |
1.98 |
require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0)); |
491 |
pcg |
1.1 |
|
492 |
|
|
#if ENABLE_COMPRESSION |
493 |
|
|
u8 cdata[MAX_MTU]; |
494 |
|
|
|
495 |
|
|
if (type == PT_DATA_COMPRESSED) |
496 |
|
|
d = cdata; |
497 |
|
|
else |
498 |
|
|
#endif |
499 |
root |
1.101 |
d = &(*p)[6 + 6] - DATAHDR; |
500 |
pcg |
1.1 |
|
501 |
root |
1.101 |
// we play do evil games with the struct layout atm. |
502 |
|
|
// pending better solutions, we at least do some verification. |
503 |
|
|
// this is fine, as we left ISO territory long ago. |
504 |
|
|
require (DATAHDR <= 16); |
505 |
|
|
require ((u8 *)(&p->len + 1) == &(*p)[0]); |
506 |
|
|
|
507 |
|
|
// this can overwrite the len/dst/src fields |
508 |
pcg |
1.29 |
require (EVP_DecryptUpdate (cctx, |
509 |
pcg |
1.1 |
d, &outl2, |
510 |
pcg |
1.29 |
(unsigned char *)&data, len - data_hdr_size ())); |
511 |
pcg |
1.1 |
outl += outl2; |
512 |
|
|
|
513 |
pcg |
1.29 |
require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
514 |
pcg |
1.1 |
outl += outl2; |
515 |
|
|
|
516 |
|
|
seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
517 |
|
|
|
518 |
|
|
id2mac (dst () ? dst() : THISNODE->id, p->dst); |
519 |
|
|
id2mac (src (), p->src); |
520 |
|
|
|
521 |
|
|
#if ENABLE_COMPRESSION |
522 |
|
|
if (type == PT_DATA_COMPRESSED) |
523 |
|
|
{ |
524 |
|
|
u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
525 |
|
|
|
526 |
|
|
p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0, |
527 |
|
|
&(*p)[6 + 6], MAX_MTU) |
528 |
|
|
+ 6 + 6; |
529 |
|
|
} |
530 |
|
|
else |
531 |
|
|
p->len = outl + (6 + 6 - DATAHDR); |
532 |
|
|
#endif |
533 |
|
|
|
534 |
|
|
return p; |
535 |
|
|
} |
536 |
|
|
|
537 |
|
|
struct ping_packet : vpn_packet |
538 |
|
|
{ |
539 |
|
|
void setup (int dst, ptype type) |
540 |
|
|
{ |
541 |
|
|
set_hdr (type, dst); |
542 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
543 |
|
|
} |
544 |
|
|
}; |
545 |
|
|
|
546 |
|
|
struct config_packet : vpn_packet |
547 |
|
|
{ |
548 |
root |
1.103 |
u8 serial[SERIAL_SIZE]; |
549 |
root |
1.98 |
u8 prot_major, prot_minor, randsize; |
550 |
|
|
u8 flags, features, pad6, pad7, pad8; |
551 |
|
|
u32 cipher_nid, mac_nid, auth_nid; |
552 |
pcg |
1.1 |
|
553 |
|
|
void setup (ptype type, int dst); |
554 |
root |
1.103 |
bool chk_config (const conf_node *conf, const sockinfo &rsi) const; |
555 |
pcg |
1.32 |
|
556 |
|
|
static u8 get_features () |
557 |
|
|
{ |
558 |
|
|
u8 f = 0; |
559 |
|
|
#if ENABLE_COMPRESSION |
560 |
|
|
f |= FEATURE_COMPRESSION; |
561 |
|
|
#endif |
562 |
|
|
#if ENABLE_ROHC |
563 |
|
|
f |= FEATURE_ROHC; |
564 |
|
|
#endif |
565 |
pcg |
1.59 |
#if ENABLE_BRIDGING |
566 |
|
|
f |= FEATURE_BRIDGING; |
567 |
|
|
#endif |
568 |
pcg |
1.32 |
return f; |
569 |
|
|
} |
570 |
pcg |
1.1 |
}; |
571 |
|
|
|
572 |
root |
1.90 |
void |
573 |
|
|
config_packet::setup (ptype type, int dst) |
574 |
pcg |
1.1 |
{ |
575 |
|
|
prot_major = PROTOCOL_MAJOR; |
576 |
|
|
prot_minor = PROTOCOL_MINOR; |
577 |
|
|
randsize = RAND_SIZE; |
578 |
pcg |
1.48 |
flags = 0; |
579 |
pcg |
1.32 |
features = get_features (); |
580 |
pcg |
1.1 |
|
581 |
root |
1.103 |
strncpy ((char *)serial, conf.serial, sizeof (serial)); |
582 |
|
|
|
583 |
root |
1.98 |
cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); |
584 |
|
|
mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); |
585 |
|
|
auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); |
586 |
pcg |
1.1 |
|
587 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
588 |
|
|
set_hdr (type, dst); |
589 |
|
|
} |
590 |
|
|
|
591 |
root |
1.90 |
bool |
592 |
root |
1.103 |
config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const |
593 |
pcg |
1.1 |
{ |
594 |
pcg |
1.15 |
if (prot_major != PROTOCOL_MAJOR) |
595 |
root |
1.103 |
slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"), |
596 |
|
|
conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR); |
597 |
pcg |
1.15 |
else if (randsize != RAND_SIZE) |
598 |
root |
1.103 |
slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"), |
599 |
|
|
conf->nodename, (const char *)rsi, randsize, RAND_SIZE); |
600 |
root |
1.98 |
else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ()))) |
601 |
root |
1.103 |
slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"), |
602 |
|
|
conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ())); |
603 |
root |
1.98 |
else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ()))) |
604 |
root |
1.103 |
slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"), |
605 |
|
|
conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); |
606 |
root |
1.98 |
else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) |
607 |
root |
1.103 |
slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"), |
608 |
|
|
conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); |
609 |
pcg |
1.15 |
else |
610 |
root |
1.103 |
{ |
611 |
|
|
int cmp = memcmp (serial, ::conf.serial, sizeof (serial)); |
612 |
|
|
|
613 |
|
|
if (cmp > 0) |
614 |
|
|
slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"), |
615 |
|
|
conf->nodename, (const char *)rsi); |
616 |
|
|
else if (cmp == 0) |
617 |
|
|
return true; |
618 |
|
|
} |
619 |
pcg |
1.15 |
|
620 |
|
|
return false; |
621 |
pcg |
1.1 |
} |
622 |
|
|
|
623 |
root |
1.98 |
struct auth_req_packet : config_packet // UNPROTECTED |
624 |
pcg |
1.1 |
{ |
625 |
|
|
char magic[8]; |
626 |
|
|
u8 initiate; // false if this is just an automatic reply |
627 |
pcg |
1.28 |
u8 protocols; // supported protocols (will be patched on forward) |
628 |
pcg |
1.1 |
u8 pad2, pad3; |
629 |
root |
1.98 |
auth_encr encr; |
630 |
pcg |
1.1 |
|
631 |
|
|
auth_req_packet (int dst, bool initiate_, u8 protocols_) |
632 |
|
|
{ |
633 |
|
|
config_packet::setup (PT_AUTH_REQ, dst); |
634 |
root |
1.98 |
memcpy (magic, MAGIC, 8); |
635 |
pcg |
1.1 |
initiate = !!initiate_; |
636 |
|
|
protocols = protocols_; |
637 |
|
|
|
638 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
639 |
|
|
} |
640 |
|
|
}; |
641 |
|
|
|
642 |
root |
1.103 |
struct auth_res_packet : vpn_packet // UNPROTECTED |
643 |
pcg |
1.1 |
{ |
644 |
root |
1.98 |
auth_response response; |
645 |
pcg |
1.1 |
|
646 |
|
|
auth_res_packet (int dst) |
647 |
|
|
{ |
648 |
root |
1.103 |
set_hdr (PT_AUTH_RES, dst); |
649 |
pcg |
1.1 |
|
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 |
root |
1.98 |
connection::connection_established (const sockinfo &rsi) |
689 |
pcg |
1.10 |
{ |
690 |
root |
1.98 |
if (!have_snd_auth || !have_rcv_auth) |
691 |
|
|
return; |
692 |
|
|
|
693 |
|
|
si = rsi; |
694 |
|
|
protocol = rsi.prot; |
695 |
|
|
|
696 |
|
|
slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
697 |
|
|
conf->nodename, (const char *)rsi, |
698 |
|
|
is_direct ? "direct" : "forwarded", |
699 |
|
|
PROTOCOL_MAJOR, prot_minor); |
700 |
|
|
|
701 |
|
|
if (::conf.script_node_up) |
702 |
|
|
{ |
703 |
|
|
run_script_cb *cb = new run_script_cb; |
704 |
|
|
cb->set<connection, &connection::script_node_up> (this); |
705 |
|
|
run_script_queued (cb, _("node-up command execution failed, continuing.")); |
706 |
|
|
} |
707 |
|
|
|
708 |
|
|
delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0); |
709 |
|
|
iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); |
710 |
|
|
|
711 |
|
|
delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); |
712 |
|
|
oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; |
713 |
pcg |
1.61 |
|
714 |
root |
1.102 |
oiv.reset (); |
715 |
|
|
|
716 |
|
|
// make sure rekeying timeouts are slightly asymmetric |
717 |
|
|
ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
718 |
|
|
rekey.start (rekey_interval, rekey_interval); |
719 |
|
|
|
720 |
|
|
keepalive.start (::conf.keepalive); |
721 |
|
|
|
722 |
|
|
// send queued packets |
723 |
pcg |
1.10 |
if (ictx && octx) |
724 |
|
|
{ |
725 |
root |
1.102 |
while (tap_packet *p = (tap_packet *)data_queue.get ()) |
726 |
|
|
{ |
727 |
|
|
if (p->len) send_data_packet (p); |
728 |
|
|
delete p; |
729 |
|
|
} |
730 |
root |
1.97 |
|
731 |
root |
1.102 |
while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
732 |
pcg |
1.12 |
{ |
733 |
root |
1.102 |
if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
734 |
|
|
delete p; |
735 |
pcg |
1.12 |
} |
736 |
root |
1.102 |
} |
737 |
pcg |
1.73 |
|
738 |
root |
1.102 |
vpn->connection_established (this); |
739 |
pcg |
1.10 |
} |
740 |
|
|
|
741 |
|
|
void |
742 |
pcg |
1.8 |
connection::reset_si () |
743 |
pcg |
1.1 |
{ |
744 |
pcg |
1.73 |
if (vpn->can_direct (THISNODE, conf)) |
745 |
|
|
protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
746 |
|
|
else |
747 |
pcg |
1.59 |
{ |
748 |
pcg |
1.73 |
slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
749 |
pcg |
1.59 |
protocol = 0; |
750 |
|
|
} |
751 |
pcg |
1.6 |
|
752 |
|
|
si.set (conf, protocol); |
753 |
pcg |
1.73 |
|
754 |
|
|
is_direct = si.valid (); |
755 |
pcg |
1.1 |
} |
756 |
|
|
|
757 |
pcg |
1.8 |
// ensure sockinfo is valid, forward if necessary |
758 |
|
|
const sockinfo & |
759 |
|
|
connection::forward_si (const sockinfo &si) const |
760 |
|
|
{ |
761 |
|
|
if (!si.valid ()) |
762 |
|
|
{ |
763 |
pcg |
1.73 |
connection *r = vpn->find_router_for (this); |
764 |
pcg |
1.8 |
|
765 |
|
|
if (r) |
766 |
|
|
{ |
767 |
pcg |
1.73 |
slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
768 |
|
|
conf->nodename, r->conf->nodename); |
769 |
pcg |
1.8 |
return r->si; |
770 |
|
|
} |
771 |
|
|
else |
772 |
pcg |
1.73 |
slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
773 |
pcg |
1.8 |
conf->nodename); |
774 |
|
|
} |
775 |
|
|
|
776 |
|
|
return si; |
777 |
|
|
} |
778 |
|
|
|
779 |
pcg |
1.1 |
void |
780 |
pcg |
1.10 |
connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
781 |
|
|
{ |
782 |
pcg |
1.46 |
if (!vpn->send_vpn_packet (pkt, si, tos)) |
783 |
pcg |
1.10 |
reset_connection (); |
784 |
|
|
} |
785 |
|
|
|
786 |
|
|
void |
787 |
pcg |
1.1 |
connection::send_ping (const sockinfo &si, u8 pong) |
788 |
|
|
{ |
789 |
|
|
ping_packet *pkt = new ping_packet; |
790 |
|
|
|
791 |
|
|
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
792 |
pcg |
1.73 |
|
793 |
pcg |
1.79 |
slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
794 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
795 |
pcg |
1.1 |
|
796 |
|
|
delete pkt; |
797 |
|
|
} |
798 |
|
|
|
799 |
|
|
void |
800 |
|
|
connection::send_reset (const sockinfo &si) |
801 |
|
|
{ |
802 |
|
|
if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
803 |
|
|
{ |
804 |
|
|
config_packet *pkt = new config_packet; |
805 |
|
|
|
806 |
|
|
pkt->setup (vpn_packet::PT_RESET, conf->id); |
807 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_MINCOST); |
808 |
pcg |
1.1 |
|
809 |
|
|
delete pkt; |
810 |
|
|
} |
811 |
|
|
} |
812 |
|
|
|
813 |
|
|
void |
814 |
|
|
connection::send_auth_request (const sockinfo &si, bool initiate) |
815 |
|
|
{ |
816 |
|
|
auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
817 |
|
|
|
818 |
root |
1.98 |
generate_auth_data (); |
819 |
|
|
auth_encrypt (conf->rsa_key, snd_auth, pkt->encr); |
820 |
pcg |
1.1 |
|
821 |
pcg |
1.81 |
slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
822 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
823 |
pcg |
1.1 |
|
824 |
pcg |
1.6 |
delete pkt; |
825 |
pcg |
1.1 |
} |
826 |
|
|
|
827 |
|
|
void |
828 |
root |
1.98 |
connection::send_auth_response (const sockinfo &si) |
829 |
pcg |
1.1 |
{ |
830 |
|
|
auth_res_packet *pkt = new auth_res_packet (conf->id); |
831 |
|
|
|
832 |
root |
1.104 |
memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b); |
833 |
|
|
auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac); |
834 |
pcg |
1.1 |
|
835 |
pcg |
1.80 |
slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
836 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
837 |
pcg |
1.1 |
|
838 |
|
|
delete pkt; |
839 |
|
|
} |
840 |
|
|
|
841 |
|
|
void |
842 |
|
|
connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
843 |
|
|
{ |
844 |
root |
1.93 |
slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
845 |
|
|
vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
846 |
|
|
conf->protocols); |
847 |
pcg |
1.1 |
|
848 |
|
|
connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
849 |
|
|
|
850 |
|
|
r->hmac_set (octx); |
851 |
pcg |
1.10 |
send_vpn_packet (r, si); |
852 |
pcg |
1.1 |
|
853 |
|
|
delete r; |
854 |
|
|
} |
855 |
|
|
|
856 |
pcg |
1.66 |
inline void |
857 |
pcg |
1.60 |
connection::establish_connection_cb (ev::timer &w, int revents) |
858 |
pcg |
1.1 |
{ |
859 |
root |
1.92 |
if (!(ictx && octx) |
860 |
pcg |
1.25 |
&& conf != THISNODE |
861 |
|
|
&& connectmode != conf_node::C_NEVER |
862 |
|
|
&& connectmode != conf_node::C_DISABLED |
863 |
pcg |
1.60 |
&& !w.is_active ()) |
864 |
pcg |
1.1 |
{ |
865 |
pcg |
1.67 |
// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
866 |
|
|
// and stop trying. should probably be handled by a per-connection expire handler. |
867 |
|
|
if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
868 |
|
|
{ |
869 |
|
|
reset_connection (); |
870 |
|
|
return; |
871 |
|
|
} |
872 |
|
|
|
873 |
pcg |
1.68 |
last_establish_attempt = ev_now (); |
874 |
|
|
|
875 |
pcg |
1.60 |
ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
876 |
|
|
? (retry_cnt & 3) + 1 |
877 |
|
|
: 1 << (retry_cnt >> 2)); |
878 |
pcg |
1.1 |
|
879 |
pcg |
1.47 |
reset_si (); |
880 |
pcg |
1.1 |
|
881 |
pcg |
1.47 |
bool slow = si.prot & PROT_SLOW; |
882 |
pcg |
1.8 |
|
883 |
pcg |
1.73 |
if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
884 |
pcg |
1.60 |
{ |
885 |
|
|
/*TODO*/ /* start the timer so we don't recurse endlessly */ |
886 |
|
|
w.start (1); |
887 |
pcg |
1.74 |
vpn->send_connect_request (this); |
888 |
pcg |
1.60 |
} |
889 |
pcg |
1.8 |
else |
890 |
pcg |
1.1 |
{ |
891 |
pcg |
1.73 |
if (si.valid ()) |
892 |
|
|
slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
893 |
|
|
conf->nodename, (const char *)si); |
894 |
pcg |
1.61 |
|
895 |
pcg |
1.8 |
const sockinfo &dsi = forward_si (si); |
896 |
pcg |
1.6 |
|
897 |
pcg |
1.47 |
slow = slow || (dsi.prot & PROT_SLOW); |
898 |
|
|
|
899 |
pcg |
1.8 |
if (dsi.valid () && auth_rate_limiter.can (dsi)) |
900 |
|
|
{ |
901 |
|
|
if (retry_cnt < 4) |
902 |
|
|
send_auth_request (dsi, true); |
903 |
|
|
else |
904 |
|
|
send_ping (dsi, 0); |
905 |
|
|
} |
906 |
pcg |
1.1 |
} |
907 |
pcg |
1.47 |
|
908 |
pcg |
1.68 |
retry_int *= slow ? 8. : 0.9; |
909 |
pcg |
1.47 |
|
910 |
|
|
if (retry_int < conf->max_retry) |
911 |
|
|
retry_cnt++; |
912 |
|
|
else |
913 |
|
|
retry_int = conf->max_retry; |
914 |
|
|
|
915 |
pcg |
1.60 |
w.start (retry_int); |
916 |
pcg |
1.1 |
} |
917 |
|
|
} |
918 |
|
|
|
919 |
|
|
void |
920 |
|
|
connection::reset_connection () |
921 |
|
|
{ |
922 |
|
|
if (ictx && octx) |
923 |
|
|
{ |
924 |
|
|
slog (L_INFO, _("%s(%s): connection lost"), |
925 |
|
|
conf->nodename, (const char *)si); |
926 |
|
|
|
927 |
|
|
if (::conf.script_node_down) |
928 |
pcg |
1.64 |
{ |
929 |
pcg |
1.70 |
run_script_cb *cb = new run_script_cb; |
930 |
|
|
cb->set<connection, &connection::script_node_down> (this); |
931 |
|
|
run_script_queued (cb, _("node-down command execution failed, continuing.")); |
932 |
pcg |
1.64 |
} |
933 |
pcg |
1.1 |
} |
934 |
|
|
|
935 |
|
|
delete ictx; ictx = 0; |
936 |
|
|
delete octx; octx = 0; |
937 |
|
|
|
938 |
pcg |
1.38 |
si.host = 0; |
939 |
pcg |
1.1 |
|
940 |
root |
1.98 |
have_snd_auth = false; |
941 |
|
|
have_rcv_auth = false; |
942 |
|
|
auth_expire = 0.; |
943 |
|
|
|
944 |
pcg |
1.73 |
last_activity = 0.; |
945 |
|
|
//last_si_change = 0.; |
946 |
pcg |
1.1 |
retry_cnt = 0; |
947 |
|
|
|
948 |
pcg |
1.25 |
rekey.stop (); |
949 |
|
|
keepalive.stop (); |
950 |
|
|
establish_connection.stop (); |
951 |
pcg |
1.1 |
} |
952 |
|
|
|
953 |
|
|
void |
954 |
|
|
connection::shutdown () |
955 |
|
|
{ |
956 |
|
|
if (ictx && octx) |
957 |
|
|
send_reset (si); |
958 |
|
|
|
959 |
|
|
reset_connection (); |
960 |
|
|
} |
961 |
|
|
|
962 |
pcg |
1.73 |
// poor-man's rekeying |
963 |
pcg |
1.66 |
inline void |
964 |
pcg |
1.60 |
connection::rekey_cb (ev::timer &w, int revents) |
965 |
pcg |
1.1 |
{ |
966 |
|
|
reset_connection (); |
967 |
|
|
establish_connection (); |
968 |
|
|
} |
969 |
|
|
|
970 |
|
|
void |
971 |
pcg |
1.21 |
connection::send_data_packet (tap_packet *pkt) |
972 |
pcg |
1.1 |
{ |
973 |
|
|
vpndata_packet *p = new vpndata_packet; |
974 |
|
|
int tos = 0; |
975 |
|
|
|
976 |
pcg |
1.12 |
// I am not hilarious about peeking into packets, but so be it. |
977 |
pcg |
1.21 |
if (conf->inherit_tos && pkt->is_ipv4 ()) |
978 |
pcg |
1.1 |
tos = (*pkt)[15] & IPTOS_TOS_MASK; |
979 |
|
|
|
980 |
pcg |
1.21 |
p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
981 |
pcg |
1.10 |
send_vpn_packet (p, si, tos); |
982 |
pcg |
1.1 |
|
983 |
|
|
delete p; |
984 |
|
|
|
985 |
|
|
if (oseqno > MAX_SEQNO) |
986 |
|
|
rekey (); |
987 |
|
|
} |
988 |
|
|
|
989 |
|
|
void |
990 |
pcg |
1.68 |
connection::post_inject_queue () |
991 |
|
|
{ |
992 |
|
|
// force a connection every now and when when packets are sent (max 1/s) |
993 |
|
|
if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
994 |
|
|
establish_connection.stop (); |
995 |
|
|
|
996 |
|
|
establish_connection (); |
997 |
|
|
} |
998 |
|
|
|
999 |
|
|
void |
1000 |
|
|
connection::inject_data_packet (tap_packet *pkt) |
1001 |
pcg |
1.1 |
{ |
1002 |
|
|
if (ictx && octx) |
1003 |
pcg |
1.21 |
send_data_packet (pkt); |
1004 |
pcg |
1.1 |
else |
1005 |
|
|
{ |
1006 |
pcg |
1.68 |
data_queue.put (new tap_packet (*pkt)); |
1007 |
|
|
post_inject_queue (); |
1008 |
pcg |
1.1 |
} |
1009 |
|
|
} |
1010 |
|
|
|
1011 |
root |
1.90 |
void |
1012 |
|
|
connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1013 |
pcg |
1.8 |
{ |
1014 |
|
|
if (ictx && octx) |
1015 |
pcg |
1.10 |
send_vpn_packet (pkt, si, tos); |
1016 |
pcg |
1.8 |
else |
1017 |
pcg |
1.12 |
{ |
1018 |
pcg |
1.28 |
vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
1019 |
pcg |
1.68 |
post_inject_queue (); |
1020 |
pcg |
1.12 |
} |
1021 |
pcg |
1.8 |
} |
1022 |
|
|
|
1023 |
pcg |
1.1 |
void |
1024 |
|
|
connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1025 |
|
|
{ |
1026 |
pcg |
1.62 |
last_activity = ev_now (); |
1027 |
pcg |
1.1 |
|
1028 |
root |
1.91 |
slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
1029 |
pcg |
1.79 |
conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
1030 |
pcg |
1.1 |
|
1031 |
pcg |
1.61 |
if (connectmode == conf_node::C_DISABLED) |
1032 |
|
|
return; |
1033 |
|
|
|
1034 |
pcg |
1.1 |
switch (pkt->typ ()) |
1035 |
|
|
{ |
1036 |
pcg |
1.3 |
case vpn_packet::PT_PING: |
1037 |
pcg |
1.79 |
slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
1038 |
|
|
|
1039 |
pcg |
1.3 |
// we send pings instead of auth packets after some retries, |
1040 |
|
|
// so reset the retry counter and establish a connection |
1041 |
|
|
// when we receive a ping. |
1042 |
root |
1.89 |
if (!ictx) |
1043 |
pcg |
1.3 |
{ |
1044 |
|
|
if (auth_rate_limiter.can (rsi)) |
1045 |
|
|
send_auth_request (rsi, true); |
1046 |
|
|
} |
1047 |
|
|
else |
1048 |
root |
1.89 |
// we would love to change the socket address here, but ping's aren't |
1049 |
pcg |
1.73 |
// authenticated, so we best ignore it. |
1050 |
pcg |
1.3 |
send_ping (rsi, 1); // pong |
1051 |
|
|
|
1052 |
|
|
break; |
1053 |
|
|
|
1054 |
|
|
case vpn_packet::PT_PONG: |
1055 |
pcg |
1.79 |
slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
1056 |
root |
1.89 |
|
1057 |
|
|
// a PONG might mean that the other side doesn't really know |
1058 |
|
|
// about our desire for communication. |
1059 |
|
|
establish_connection (); |
1060 |
pcg |
1.3 |
break; |
1061 |
|
|
|
1062 |
|
|
case vpn_packet::PT_RESET: |
1063 |
pcg |
1.1 |
{ |
1064 |
pcg |
1.3 |
reset_connection (); |
1065 |
|
|
|
1066 |
|
|
config_packet *p = (config_packet *) pkt; |
1067 |
|
|
|
1068 |
root |
1.103 |
if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS) |
1069 |
pcg |
1.3 |
establish_connection (); |
1070 |
pcg |
1.1 |
} |
1071 |
pcg |
1.3 |
break; |
1072 |
|
|
|
1073 |
|
|
case vpn_packet::PT_AUTH_REQ: |
1074 |
|
|
if (auth_rate_limiter.can (rsi)) |
1075 |
|
|
{ |
1076 |
root |
1.93 |
auth_req_packet *p = (auth_req_packet *)pkt; |
1077 |
pcg |
1.3 |
|
1078 |
root |
1.93 |
slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
1079 |
|
|
conf->nodename, p->initiate ? "initiate" : "reply", |
1080 |
|
|
p->protocols, p->features); |
1081 |
pcg |
1.1 |
|
1082 |
root |
1.103 |
if (memcmp (p->magic, MAGIC, 8)) |
1083 |
|
|
{ |
1084 |
|
|
slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"), |
1085 |
|
|
conf->nodename, (const char *)rsi); |
1086 |
|
|
} |
1087 |
|
|
else if (p->chk_config (conf, rsi)) |
1088 |
pcg |
1.3 |
{ |
1089 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
1090 |
|
|
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1091 |
|
|
conf->nodename, (const char *)rsi, |
1092 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1093 |
|
|
|
1094 |
|
|
if (p->initiate) |
1095 |
|
|
send_auth_request (rsi, false); |
1096 |
|
|
|
1097 |
root |
1.98 |
auth_data auth; |
1098 |
pcg |
1.3 |
|
1099 |
root |
1.98 |
if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
1100 |
pcg |
1.23 |
{ |
1101 |
|
|
slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1102 |
|
|
conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1103 |
|
|
} |
1104 |
pcg |
1.3 |
else |
1105 |
|
|
{ |
1106 |
root |
1.98 |
bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth); |
1107 |
pcg |
1.1 |
|
1108 |
root |
1.98 |
rcv_auth = auth; |
1109 |
|
|
have_rcv_auth = true; |
1110 |
pcg |
1.1 |
|
1111 |
root |
1.98 |
send_auth_response (rsi); |
1112 |
pcg |
1.10 |
|
1113 |
root |
1.98 |
if (chg) |
1114 |
|
|
{ |
1115 |
|
|
conf->protocols = p->protocols; |
1116 |
|
|
features = p->features & config_packet::get_features (); |
1117 |
pcg |
1.3 |
|
1118 |
root |
1.98 |
connection_established (rsi); |
1119 |
|
|
} |
1120 |
|
|
} |
1121 |
pcg |
1.10 |
|
1122 |
root |
1.98 |
break; |
1123 |
pcg |
1.3 |
} |
1124 |
|
|
|
1125 |
|
|
send_reset (rsi); |
1126 |
pcg |
1.1 |
} |
1127 |
|
|
|
1128 |
pcg |
1.3 |
break; |
1129 |
|
|
|
1130 |
|
|
case vpn_packet::PT_AUTH_RES: |
1131 |
pcg |
1.1 |
{ |
1132 |
pcg |
1.79 |
auth_res_packet *p = (auth_res_packet *)pkt; |
1133 |
pcg |
1.1 |
|
1134 |
pcg |
1.81 |
slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
1135 |
pcg |
1.1 |
|
1136 |
root |
1.104 |
auth_mac local_mac; |
1137 |
|
|
auth_hash (snd_auth, p->response.ecdh, local_mac); |
1138 |
|
|
|
1139 |
|
|
if (memcmp (&p->response.mac, local_mac, sizeof local_mac)) |
1140 |
pcg |
1.1 |
{ |
1141 |
root |
1.103 |
slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
1142 |
|
|
conf->nodename, (const char *)rsi); |
1143 |
|
|
} |
1144 |
|
|
else if (!have_snd_auth) |
1145 |
|
|
{ |
1146 |
root |
1.104 |
memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b); |
1147 |
root |
1.98 |
|
1148 |
root |
1.103 |
have_snd_auth = true; |
1149 |
|
|
connection_established (rsi); |
1150 |
pcg |
1.1 |
} |
1151 |
root |
1.103 |
|
1152 |
|
|
break; |
1153 |
pcg |
1.1 |
} |
1154 |
|
|
|
1155 |
pcg |
1.3 |
send_reset (rsi); |
1156 |
|
|
break; |
1157 |
pcg |
1.1 |
|
1158 |
pcg |
1.3 |
case vpn_packet::PT_DATA_COMPRESSED: |
1159 |
|
|
#if !ENABLE_COMPRESSION |
1160 |
|
|
send_reset (rsi); |
1161 |
|
|
break; |
1162 |
|
|
#endif |
1163 |
pcg |
1.1 |
|
1164 |
pcg |
1.3 |
case vpn_packet::PT_DATA_UNCOMPRESSED: |
1165 |
pcg |
1.1 |
|
1166 |
pcg |
1.3 |
if (ictx && octx) |
1167 |
pcg |
1.1 |
{ |
1168 |
pcg |
1.3 |
vpndata_packet *p = (vpndata_packet *)pkt; |
1169 |
pcg |
1.1 |
|
1170 |
pcg |
1.10 |
if (!p->hmac_chk (ictx)) |
1171 |
|
|
slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1172 |
pcg |
1.73 |
"could be an attack, or just corruption or a synchronization error."), |
1173 |
pcg |
1.10 |
conf->nodename, (const char *)rsi); |
1174 |
|
|
else |
1175 |
pcg |
1.1 |
{ |
1176 |
pcg |
1.10 |
u32 seqno; |
1177 |
|
|
tap_packet *d = p->unpack (this, seqno); |
1178 |
pcg |
1.73 |
int seqclass = iseqno.seqno_classify (seqno); |
1179 |
pcg |
1.10 |
|
1180 |
pcg |
1.73 |
if (seqclass == 0) // ok |
1181 |
pcg |
1.1 |
{ |
1182 |
pcg |
1.10 |
vpn->tap->send (d); |
1183 |
pcg |
1.1 |
|
1184 |
pcg |
1.10 |
if (si != rsi) |
1185 |
pcg |
1.1 |
{ |
1186 |
pcg |
1.56 |
// fast re-sync on source address changes, useful especially for tcp/ip |
1187 |
pcg |
1.73 |
//if (last_si_change < ev_now () + 5.) |
1188 |
|
|
// { |
1189 |
pcg |
1.78 |
slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1190 |
|
|
conf->nodename, (const char *)si, (const char *)rsi); |
1191 |
|
|
|
1192 |
pcg |
1.73 |
si = rsi; |
1193 |
pcg |
1.84 |
|
1194 |
|
|
if (::conf.script_node_change) |
1195 |
|
|
{ |
1196 |
|
|
run_script_cb *cb = new run_script_cb; |
1197 |
|
|
cb->set<connection, &connection::script_node_change> (this); |
1198 |
|
|
run_script_queued (cb, _("node-change command execution failed, continuing.")); |
1199 |
|
|
} |
1200 |
|
|
|
1201 |
pcg |
1.73 |
// } |
1202 |
|
|
//else |
1203 |
|
|
// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
1204 |
|
|
// conf->nodename, (const char *)si, (const char *)rsi); |
1205 |
pcg |
1.10 |
} |
1206 |
pcg |
1.32 |
} |
1207 |
pcg |
1.75 |
else if (seqclass == 1) // far history |
1208 |
|
|
slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
1209 |
|
|
"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
1210 |
|
|
else if (seqclass == 2) // in-window duplicate, happens often on wireless |
1211 |
|
|
slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
1212 |
|
|
"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
1213 |
|
|
else if (seqclass == 3) // reset |
1214 |
pcg |
1.73 |
{ |
1215 |
pcg |
1.75 |
slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
1216 |
|
|
"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
1217 |
pcg |
1.73 |
send_reset (rsi); |
1218 |
|
|
} |
1219 |
pcg |
1.3 |
|
1220 |
pcg |
1.32 |
delete d; |
1221 |
|
|
break; |
1222 |
pcg |
1.1 |
} |
1223 |
|
|
} |
1224 |
|
|
|
1225 |
pcg |
1.3 |
send_reset (rsi); |
1226 |
|
|
break; |
1227 |
pcg |
1.1 |
|
1228 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_REQ: |
1229 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1230 |
|
|
{ |
1231 |
pcg |
1.84 |
connect_req_packet *p = (connect_req_packet *)pkt; |
1232 |
pcg |
1.1 |
|
1233 |
pcg |
1.57 |
if (p->id > 0 && p->id <= vpn->conns.size ()) |
1234 |
|
|
{ |
1235 |
|
|
connection *c = vpn->conns[p->id - 1]; |
1236 |
|
|
conf->protocols = p->protocols; |
1237 |
pcg |
1.1 |
|
1238 |
root |
1.93 |
slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
1239 |
|
|
conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
1240 |
|
|
p->protocols, |
1241 |
|
|
c->ictx && c->octx); |
1242 |
pcg |
1.1 |
|
1243 |
pcg |
1.57 |
if (c->ictx && c->octx) |
1244 |
|
|
{ |
1245 |
|
|
// send connect_info packets to both sides, in case one is |
1246 |
|
|
// behind a nat firewall (or both ;) |
1247 |
|
|
c->send_connect_info (conf->id, si, conf->protocols); |
1248 |
|
|
send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1249 |
|
|
} |
1250 |
|
|
else |
1251 |
|
|
c->establish_connection (); |
1252 |
pcg |
1.3 |
} |
1253 |
pcg |
1.11 |
else |
1254 |
pcg |
1.57 |
slog (L_WARN, |
1255 |
|
|
_("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1256 |
|
|
p->id); |
1257 |
pcg |
1.3 |
} |
1258 |
pcg |
1.1 |
|
1259 |
pcg |
1.3 |
break; |
1260 |
pcg |
1.1 |
|
1261 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_INFO: |
1262 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1263 |
|
|
{ |
1264 |
pcg |
1.39 |
connect_info_packet *p = (connect_info_packet *)pkt; |
1265 |
pcg |
1.1 |
|
1266 |
pcg |
1.57 |
if (p->id > 0 && p->id <= vpn->conns.size ()) |
1267 |
pcg |
1.39 |
{ |
1268 |
|
|
connection *c = vpn->conns[p->id - 1]; |
1269 |
pcg |
1.7 |
|
1270 |
pcg |
1.39 |
c->conf->protocols = p->protocols; |
1271 |
|
|
protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1272 |
|
|
p->si.upgrade_protocol (protocol, c->conf); |
1273 |
pcg |
1.1 |
|
1274 |
root |
1.96 |
slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1275 |
root |
1.93 |
conf->nodename, |
1276 |
|
|
vpn->conns[p->id - 1]->conf->nodename, |
1277 |
|
|
(const char *)p->si, |
1278 |
|
|
p->protocols, |
1279 |
root |
1.96 |
protocol, |
1280 |
|
|
p->si.supported_protocols (c->conf), |
1281 |
root |
1.93 |
!c->ictx && !c->octx); |
1282 |
pcg |
1.7 |
|
1283 |
pcg |
1.39 |
const sockinfo &dsi = forward_si (p->si); |
1284 |
pcg |
1.1 |
|
1285 |
pcg |
1.39 |
if (dsi.valid ()) |
1286 |
|
|
c->send_auth_request (dsi, true); |
1287 |
root |
1.96 |
else |
1288 |
|
|
slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
1289 |
|
|
vpn->conns[p->id - 1]->conf->nodename, |
1290 |
|
|
(const char *)p->si); |
1291 |
pcg |
1.39 |
} |
1292 |
pcg |
1.57 |
else |
1293 |
|
|
slog (L_WARN, |
1294 |
|
|
_("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1295 |
|
|
p->id); |
1296 |
pcg |
1.3 |
} |
1297 |
pcg |
1.1 |
|
1298 |
pcg |
1.3 |
break; |
1299 |
pcg |
1.1 |
|
1300 |
pcg |
1.3 |
default: |
1301 |
|
|
send_reset (rsi); |
1302 |
|
|
break; |
1303 |
pcg |
1.1 |
} |
1304 |
|
|
} |
1305 |
|
|
|
1306 |
pcg |
1.66 |
inline void |
1307 |
|
|
connection::keepalive_cb (ev::timer &w, int revents) |
1308 |
pcg |
1.1 |
{ |
1309 |
root |
1.97 |
ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
1310 |
|
|
|
1311 |
|
|
if (when >= 0) |
1312 |
|
|
w.start (when); |
1313 |
|
|
else if (when < -15) |
1314 |
pcg |
1.1 |
{ |
1315 |
|
|
reset_connection (); |
1316 |
|
|
establish_connection (); |
1317 |
|
|
} |
1318 |
|
|
else if (conf->connectmode != conf_node::C_ONDEMAND |
1319 |
|
|
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
1320 |
|
|
{ |
1321 |
root |
1.97 |
w.start (3); |
1322 |
pcg |
1.1 |
send_ping (si); |
1323 |
|
|
} |
1324 |
root |
1.97 |
else if (when >= -10) |
1325 |
pcg |
1.12 |
// hold ondemand connections implicitly a few seconds longer |
1326 |
|
|
// should delete octx, though, or something like that ;) |
1327 |
root |
1.97 |
w.start (when + 10); |
1328 |
pcg |
1.1 |
else |
1329 |
|
|
reset_connection (); |
1330 |
|
|
} |
1331 |
|
|
|
1332 |
root |
1.90 |
void |
1333 |
|
|
connection::send_connect_request (int id) |
1334 |
pcg |
1.1 |
{ |
1335 |
root |
1.93 |
connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1336 |
pcg |
1.1 |
|
1337 |
root |
1.93 |
slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
1338 |
|
|
conf->nodename, vpn->conns[id - 1]->conf->nodename, |
1339 |
|
|
THISNODE->protocols); |
1340 |
pcg |
1.1 |
p->hmac_set (octx); |
1341 |
pcg |
1.10 |
send_vpn_packet (p, si); |
1342 |
pcg |
1.1 |
|
1343 |
|
|
delete p; |
1344 |
|
|
} |
1345 |
|
|
|
1346 |
root |
1.90 |
void |
1347 |
|
|
connection::script_init_env (const char *ext) |
1348 |
pcg |
1.53 |
{ |
1349 |
|
|
char *env; |
1350 |
|
|
asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1351 |
pcg |
1.84 |
asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1352 |
pcg |
1.53 |
asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1353 |
|
|
0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1354 |
pcg |
1.84 |
conf->id & 0xff); putenv (env); |
1355 |
pcg |
1.53 |
} |
1356 |
|
|
|
1357 |
root |
1.90 |
void |
1358 |
|
|
connection::script_init_connect_env () |
1359 |
pcg |
1.1 |
{ |
1360 |
pcg |
1.52 |
vpn->script_init_env (); |
1361 |
pcg |
1.1 |
|
1362 |
|
|
char *env; |
1363 |
pcg |
1.84 |
asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1364 |
|
|
asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1365 |
|
|
asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1366 |
|
|
asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1367 |
|
|
asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1368 |
pcg |
1.1 |
} |
1369 |
|
|
|
1370 |
pcg |
1.66 |
inline const char * |
1371 |
|
|
connection::script_node_up () |
1372 |
pcg |
1.1 |
{ |
1373 |
pcg |
1.53 |
script_init_connect_env (); |
1374 |
pcg |
1.1 |
|
1375 |
pcg |
1.60 |
putenv ((char *)"STATE=up"); |
1376 |
pcg |
1.1 |
|
1377 |
pcg |
1.52 |
char *filename; |
1378 |
|
|
asprintf (&filename, |
1379 |
|
|
"%s/%s", |
1380 |
|
|
confbase, |
1381 |
|
|
::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1382 |
pcg |
1.54 |
|
1383 |
|
|
return filename; |
1384 |
pcg |
1.1 |
} |
1385 |
|
|
|
1386 |
pcg |
1.66 |
inline const char * |
1387 |
pcg |
1.84 |
connection::script_node_change () |
1388 |
|
|
{ |
1389 |
|
|
script_init_connect_env (); |
1390 |
|
|
|
1391 |
|
|
putenv ((char *)"STATE=change"); |
1392 |
|
|
|
1393 |
|
|
char *filename; |
1394 |
|
|
asprintf (&filename, |
1395 |
|
|
"%s/%s", |
1396 |
|
|
confbase, |
1397 |
|
|
::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
1398 |
|
|
|
1399 |
|
|
return filename; |
1400 |
|
|
} |
1401 |
|
|
|
1402 |
|
|
inline const char * |
1403 |
pcg |
1.66 |
connection::script_node_down () |
1404 |
pcg |
1.1 |
{ |
1405 |
pcg |
1.53 |
script_init_connect_env (); |
1406 |
pcg |
1.1 |
|
1407 |
pcg |
1.60 |
putenv ((char *)"STATE=down"); |
1408 |
pcg |
1.1 |
|
1409 |
pcg |
1.52 |
char *filename; |
1410 |
|
|
asprintf (&filename, |
1411 |
|
|
"%s/%s", |
1412 |
|
|
confbase, |
1413 |
|
|
::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1414 |
pcg |
1.54 |
|
1415 |
|
|
return filename; |
1416 |
pcg |
1.1 |
} |
1417 |
|
|
|
1418 |
pcg |
1.40 |
connection::connection (struct vpn *vpn, conf_node *conf) |
1419 |
pcg |
1.67 |
: vpn(vpn), conf(conf), |
1420 |
pcg |
1.40 |
#if ENABLE_DNS |
1421 |
pcg |
1.67 |
dns (0), |
1422 |
pcg |
1.40 |
#endif |
1423 |
pcg |
1.72 |
data_queue(conf->max_ttl, conf->max_queue + 1), |
1424 |
|
|
vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1425 |
pcg |
1.1 |
{ |
1426 |
pcg |
1.65 |
rekey .set<connection, &connection::rekey_cb > (this); |
1427 |
|
|
keepalive .set<connection, &connection::keepalive_cb > (this); |
1428 |
|
|
establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1429 |
|
|
|
1430 |
pcg |
1.68 |
last_establish_attempt = 0.; |
1431 |
pcg |
1.1 |
octx = ictx = 0; |
1432 |
|
|
|
1433 |
pcg |
1.67 |
connectmode = conf->connectmode; |
1434 |
|
|
|
1435 |
|
|
// queue a dummy packet to force an initial connection attempt |
1436 |
|
|
if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1437 |
pcg |
1.68 |
vpn_queue.put (new net_packet); |
1438 |
pcg |
1.67 |
|
1439 |
pcg |
1.1 |
reset_connection (); |
1440 |
|
|
} |
1441 |
|
|
|
1442 |
|
|
connection::~connection () |
1443 |
|
|
{ |
1444 |
|
|
shutdown (); |
1445 |
|
|
} |
1446 |
|
|
|
1447 |
root |
1.90 |
void |
1448 |
|
|
connection_init () |
1449 |
pcg |
1.1 |
{ |
1450 |
|
|
auth_rate_limiter.clear (); |
1451 |
|
|
reset_rate_limiter.clear (); |
1452 |
|
|
} |
1453 |
|
|
|