1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
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3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
5 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
7 | (at your option) any later version. |
10 | option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
12 | GNU General Public License for more details. |
15 | Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
15 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
17 | */ |
30 | */ |
18 | |
31 | |
19 | #include "config.h" |
32 | #include "config.h" |
20 | |
33 | |
21 | extern "C" { |
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22 | # include "lzf/lzf.h" |
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23 | } |
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24 | |
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25 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
26 | |
37 | |
27 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
29 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
30 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
31 | |
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32 | #include "gettext.h" |
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33 | |
42 | |
34 | #include "conf.h" |
43 | #include "conf.h" |
35 | #include "slog.h" |
44 | #include "slog.h" |
36 | #include "device.h" |
45 | #include "device.h" |
37 | #include "vpn.h" |
46 | #include "vpn.h" |
38 | #include "connection.h" |
47 | #include "connection.h" |
39 | |
48 | |
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49 | #include "netcompat.h" |
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50 | |
40 | #if !HAVE_RAND_PSEUDO_BYTES |
51 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | # define RAND_pseudo_bytes RAND_bytes |
52 | # define RAND_pseudo_bytes RAND_bytes |
42 | #endif |
53 | #endif |
43 | |
54 | |
44 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
55 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | |
56 | |
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57 | #define ULTRA_FAST 1 |
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58 | #define HLOG 15 |
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59 | #include "lzf/lzf.h" |
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60 | #include "lzf/lzf_c.c" |
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61 | #include "lzf/lzf_d.c" |
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62 | |
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63 | ////////////////////////////////////////////////////////////////////////////// |
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64 | |
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65 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
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66 | static ev::child rs_child_ev; |
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67 | |
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68 | void // c++ requires external linkage here, apparently :( |
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69 | rs_child_cb (ev::child &w, int revents) |
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70 | { |
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71 | w.stop (); |
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72 | |
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73 | if (rs_queue.empty ()) |
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74 | return; |
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75 | |
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76 | pid_t pid = run_script (*rs_queue.front ().first, false); |
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77 | if (pid) |
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78 | { |
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79 | w.set (pid); |
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80 | w.start (); |
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81 | } |
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82 | else |
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83 | slog (L_WARN, rs_queue.front ().second); |
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84 | |
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85 | delete rs_queue.front ().first; |
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86 | rs_queue.pop (); |
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87 | } |
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88 | |
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89 | // despite the fancy name, this is quite a hack |
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90 | static void |
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91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
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92 | { |
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93 | rs_queue.push (std::make_pair (cb, warnmsg)); |
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94 | |
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95 | if (!rs_child_ev.is_active ()) |
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96 | { |
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97 | rs_child_ev.set<rs_child_cb> (); |
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98 | rs_child_ev (); |
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99 | } |
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100 | } |
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101 | |
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102 | ////////////////////////////////////////////////////////////////////////////// |
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103 | |
46 | struct crypto_ctx |
104 | struct crypto_ctx |
47 | { |
105 | { |
48 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
49 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
50 | |
108 | |
… | |
… | |
53 | }; |
111 | }; |
54 | |
112 | |
55 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
113 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
56 | { |
114 | { |
57 | EVP_CIPHER_CTX_init (&cctx); |
115 | EVP_CIPHER_CTX_init (&cctx); |
58 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
116 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
59 | HMAC_CTX_init (&hctx); |
117 | HMAC_CTX_init (&hctx); |
60 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
118 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
61 | } |
119 | } |
62 | |
120 | |
63 | crypto_ctx::~crypto_ctx () |
121 | crypto_ctx::~crypto_ctx () |
64 | { |
122 | { |
65 | EVP_CIPHER_CTX_cleanup (&cctx); |
123 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
66 | HMAC_CTX_cleanup (&hctx); |
124 | HMAC_CTX_cleanup (&hctx); |
67 | } |
125 | } |
68 | |
126 | |
69 | static void |
127 | static void |
70 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
128 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
71 | { |
129 | { |
72 | EVP_MD_CTX ctx; |
130 | EVP_MD_CTX ctx; |
73 | |
131 | |
74 | EVP_MD_CTX_init (&ctx); |
132 | EVP_MD_CTX_init (&ctx); |
75 | EVP_DigestInit (&ctx, RSA_HASH); |
133 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
76 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
134 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
77 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
135 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
78 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
136 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
79 | EVP_MD_CTX_cleanup (&ctx); |
137 | EVP_MD_CTX_cleanup (&ctx); |
80 | } |
138 | } |
81 | |
139 | |
82 | struct rsa_entry { |
140 | struct rsa_entry |
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141 | { |
83 | tstamp expire; |
142 | tstamp expire; |
84 | rsaid id; |
143 | rsaid id; |
85 | rsachallenge chg; |
144 | rsachallenge chg; |
86 | }; |
145 | }; |
87 | |
146 | |
88 | struct rsa_cache : list<rsa_entry> |
147 | struct rsa_cache : list<rsa_entry> |
89 | { |
148 | { |
90 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
149 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
91 | |
150 | |
92 | bool find (const rsaid &id, rsachallenge &chg) |
151 | bool find (const rsaid &id, rsachallenge &chg) |
93 | { |
152 | { |
94 | for (iterator i = begin (); i != end (); ++i) |
153 | for (iterator i = begin (); i != end (); ++i) |
95 | { |
154 | { |
96 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
155 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
97 | { |
156 | { |
98 | memcpy (&chg, &i->chg, sizeof chg); |
157 | memcpy (&chg, &i->chg, sizeof chg); |
99 | |
158 | |
100 | erase (i); |
159 | erase (i); |
101 | return true; |
160 | return true; |
102 | } |
161 | } |
103 | } |
162 | } |
104 | |
163 | |
105 | if (cleaner.at < NOW) |
164 | if (!cleaner.is_active ()) |
106 | cleaner.start (NOW + RSA_TTL); |
165 | cleaner.again (); |
107 | |
166 | |
108 | return false; |
167 | return false; |
109 | } |
168 | } |
110 | |
169 | |
111 | void gen (rsaid &id, rsachallenge &chg) |
170 | void gen (rsaid &id, rsachallenge &chg) |
112 | { |
171 | { |
113 | rsa_entry e; |
172 | rsa_entry e; |
114 | |
173 | |
115 | RAND_bytes ((unsigned char *)&id, sizeof id); |
174 | RAND_bytes ((unsigned char *)&id, sizeof id); |
116 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
175 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
117 | |
176 | |
118 | e.expire = NOW + RSA_TTL; |
177 | e.expire = ev_now () + RSA_TTL; |
119 | e.id = id; |
178 | e.id = id; |
120 | memcpy (&e.chg, &chg, sizeof chg); |
179 | memcpy (&e.chg, &chg, sizeof chg); |
121 | |
180 | |
122 | push_back (e); |
181 | push_back (e); |
123 | |
182 | |
124 | if (cleaner.at < NOW) |
183 | if (!cleaner.is_active ()) |
125 | cleaner.start (NOW + RSA_TTL); |
184 | cleaner.again (); |
126 | } |
185 | } |
127 | |
186 | |
128 | rsa_cache () |
187 | rsa_cache () |
129 | : cleaner (this, &rsa_cache::cleaner_cb) |
188 | { |
130 | { } |
189 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
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190 | cleaner.set (RSA_TTL, RSA_TTL); |
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191 | } |
131 | |
192 | |
132 | } rsa_cache; |
193 | } rsa_cache; |
133 | |
194 | |
134 | void rsa_cache::cleaner_cb (time_watcher &w) |
195 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
135 | { |
196 | { |
136 | if (empty ()) |
197 | if (empty ()) |
137 | w.at = TSTAMP_CANCEL; |
198 | w.stop (); |
138 | else |
199 | else |
139 | { |
200 | { |
140 | w.at = NOW + RSA_TTL; |
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141 | |
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142 | for (iterator i = begin (); i != end (); ) |
201 | for (iterator i = begin (); i != end (); ) |
143 | if (i->expire <= NOW) |
202 | if (i->expire <= ev_now ()) |
144 | i = erase (i); |
203 | i = erase (i); |
145 | else |
204 | else |
146 | ++i; |
205 | ++i; |
147 | } |
206 | } |
148 | } |
207 | } |
149 | |
208 | |
150 | ////////////////////////////////////////////////////////////////////////////// |
209 | ////////////////////////////////////////////////////////////////////////////// |
151 | |
210 | |
152 | void pkt_queue::put (tap_packet *p) |
211 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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212 | : max_ttl (max_ttl), max_queue (max_queue) |
153 | { |
213 | { |
154 | if (queue[i]) |
214 | queue = new pkt [max_queue]; |
155 | { |
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156 | delete queue[i]; |
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157 | j = (j + 1) % QUEUEDEPTH; |
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158 | } |
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159 | |
215 | |
160 | queue[i] = p; |
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161 | |
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162 | i = (i + 1) % QUEUEDEPTH; |
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163 | } |
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164 | |
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165 | tap_packet *pkt_queue::get () |
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166 | { |
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167 | tap_packet *p = queue[j]; |
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168 | |
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169 | if (p) |
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170 | { |
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171 | queue[j] = 0; |
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172 | j = (j + 1) % QUEUEDEPTH; |
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173 | } |
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174 | |
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175 | return p; |
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176 | } |
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177 | |
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178 | pkt_queue::pkt_queue () |
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179 | { |
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180 | memset (queue, 0, sizeof (queue)); |
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181 | i = 0; |
216 | i = 0; |
182 | j = 0; |
217 | j = 0; |
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218 | |
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219 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
183 | } |
220 | } |
184 | |
221 | |
185 | pkt_queue::~pkt_queue () |
222 | pkt_queue::~pkt_queue () |
186 | { |
223 | { |
187 | for (i = QUEUEDEPTH; --i > 0; ) |
224 | while (net_packet *p = get ()) |
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225 | delete p; |
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226 | |
188 | delete queue[i]; |
227 | delete [] queue; |
189 | } |
228 | } |
190 | |
229 | |
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230 | void pkt_queue::expire_cb (ev::timer &w, int revents) |
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231 | { |
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232 | ev_tstamp expire = ev_now () - max_ttl; |
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233 | |
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234 | for (;;) |
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235 | { |
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236 | if (empty ()) |
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237 | break; |
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238 | |
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239 | double diff = queue[j].tstamp - expire; |
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240 | |
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241 | if (diff >= 0.) |
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242 | { |
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243 | w.start (diff > 0.5 ? diff : 0.5); |
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244 | break; |
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245 | } |
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246 | |
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247 | delete get (); |
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248 | } |
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249 | } |
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250 | |
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251 | void pkt_queue::put (net_packet *p) |
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252 | { |
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253 | ev_tstamp now = ev_now (); |
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254 | |
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255 | // start expiry timer |
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256 | if (empty ()) |
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257 | expire.start (max_ttl); |
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258 | |
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259 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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260 | |
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261 | if (ni == j) |
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262 | delete get (); |
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263 | |
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264 | queue[i].pkt = p; |
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265 | queue[i].tstamp = now; |
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266 | |
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267 | i = ni; |
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268 | } |
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269 | |
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270 | net_packet *pkt_queue::get () |
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271 | { |
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272 | if (empty ()) |
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273 | return 0; |
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274 | |
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275 | net_packet *p = queue[j].pkt; |
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276 | queue[j].pkt = 0; |
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277 | |
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278 | j = j + 1 == max_queue ? 0 : j + 1; |
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279 | |
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280 | return p; |
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281 | } |
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282 | |
191 | struct net_rateinfo { |
283 | struct net_rateinfo |
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284 | { |
192 | u32 host; |
285 | u32 host; |
193 | double pcnt, diff; |
286 | double pcnt, diff; |
194 | tstamp last; |
287 | tstamp last; |
195 | }; |
288 | }; |
196 | |
289 | |
197 | // only do action once every x seconds per host whole allowing bursts. |
290 | // only do action once every x seconds per host whole allowing bursts. |
198 | // this implementation ("splay list" ;) is inefficient, |
291 | // this implementation ("splay list" ;) is inefficient, |
199 | // but low on resources. |
292 | // but low on resources. |
200 | struct net_rate_limiter : list<net_rateinfo> |
293 | struct net_rate_limiter : list<net_rateinfo> |
201 | { |
294 | { |
202 | static const double ALPHA = 1. - 1. / 90.; // allow bursts |
295 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
203 | static const double CUTOFF = 20.; // one event every CUTOFF seconds |
296 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
204 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
297 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
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298 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
205 | |
299 | |
206 | bool can (const sockinfo &si) { return can((u32)si.host); } |
300 | bool can (const sockinfo &si) { return can((u32)si.host); } |
207 | bool can (u32 host); |
301 | bool can (u32 host); |
208 | }; |
302 | }; |
209 | |
303 | |
210 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
304 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
211 | |
305 | |
… | |
… | |
214 | iterator i; |
308 | iterator i; |
215 | |
309 | |
216 | for (i = begin (); i != end (); ) |
310 | for (i = begin (); i != end (); ) |
217 | if (i->host == host) |
311 | if (i->host == host) |
218 | break; |
312 | break; |
219 | else if (i->last < NOW - EXPIRE) |
313 | else if (i->last < ev_now () - NRL_EXPIRE) |
220 | i = erase (i); |
314 | i = erase (i); |
221 | else |
315 | else |
222 | i++; |
316 | i++; |
223 | |
317 | |
224 | if (i == end ()) |
318 | if (i == end ()) |
225 | { |
319 | { |
226 | net_rateinfo ri; |
320 | net_rateinfo ri; |
227 | |
321 | |
228 | ri.host = host; |
322 | ri.host = host; |
229 | ri.pcnt = 1.; |
323 | ri.pcnt = 1.; |
230 | ri.diff = CUTOFF * (1. / (1. - ALPHA)); |
324 | ri.diff = NRL_MAXDIF; |
231 | ri.last = NOW; |
325 | ri.last = ev_now (); |
232 | |
326 | |
233 | push_front (ri); |
327 | push_front (ri); |
234 | |
328 | |
235 | return true; |
329 | return true; |
236 | } |
330 | } |
237 | else |
331 | else |
238 | { |
332 | { |
239 | net_rateinfo ri (*i); |
333 | net_rateinfo ri (*i); |
240 | erase (i); |
334 | erase (i); |
241 | |
335 | |
242 | ri.pcnt = ri.pcnt * ALPHA; |
336 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
243 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
337 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
244 | |
338 | |
245 | ri.last = NOW; |
339 | ri.last = ev_now (); |
246 | |
340 | |
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341 | double dif = ri.diff / ri.pcnt; |
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342 | |
247 | bool send = ri.diff / ri.pcnt > CUTOFF; |
343 | bool send = dif > NRL_CUTOFF; |
248 | |
344 | |
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345 | if (dif > NRL_MAXDIF) |
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346 | { |
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347 | ri.pcnt = 1.; |
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348 | ri.diff = NRL_MAXDIF; |
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349 | } |
249 | if (send) |
350 | else if (send) |
250 | ri.pcnt++; |
351 | ri.pcnt++; |
251 | |
352 | |
252 | push_front (ri); |
353 | push_front (ri); |
253 | |
354 | |
254 | return send; |
355 | return send; |
… | |
… | |
299 | } |
400 | } |
300 | |
401 | |
301 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
402 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
302 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
403 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
303 | |
404 | |
304 | struct vpndata_packet:vpn_packet |
405 | struct vpndata_packet : vpn_packet |
305 | { |
406 | { |
306 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
407 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
307 | |
408 | |
308 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
409 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
309 | tap_packet *unpack (connection *conn, u32 &seqno); |
410 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
322 | int outl = 0, outl2; |
423 | int outl = 0, outl2; |
323 | ptype type = PT_DATA_UNCOMPRESSED; |
424 | ptype type = PT_DATA_UNCOMPRESSED; |
324 | |
425 | |
325 | #if ENABLE_COMPRESSION |
426 | #if ENABLE_COMPRESSION |
326 | u8 cdata[MAX_MTU]; |
427 | u8 cdata[MAX_MTU]; |
327 | u32 cl; |
|
|
328 | |
428 | |
|
|
429 | if (conn->features & ENABLE_COMPRESSION) |
|
|
430 | { |
329 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
431 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
432 | |
330 | if (cl) |
433 | if (cl) |
331 | { |
434 | { |
332 | type = PT_DATA_COMPRESSED; |
435 | type = PT_DATA_COMPRESSED; |
333 | d = cdata; |
436 | d = cdata; |
334 | l = cl + 2; |
437 | l = cl + 2; |
335 | |
438 | |
336 | d[0] = cl >> 8; |
439 | d[0] = cl >> 8; |
337 | d[1] = cl; |
440 | d[1] = cl; |
|
|
441 | } |
338 | } |
442 | } |
339 | #endif |
443 | #endif |
340 | |
444 | |
341 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
445 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
342 | |
446 | |
343 | struct { |
447 | struct { |
344 | #if RAND_SIZE |
448 | #if RAND_SIZE |
345 | u8 rnd[RAND_SIZE]; |
449 | u8 rnd[RAND_SIZE]; |
346 | #endif |
450 | #endif |
… | |
… | |
350 | datahdr.seqno = ntohl (seqno); |
454 | datahdr.seqno = ntohl (seqno); |
351 | #if RAND_SIZE |
455 | #if RAND_SIZE |
352 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
456 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
353 | #endif |
457 | #endif |
354 | |
458 | |
355 | EVP_EncryptUpdate (cctx, |
459 | require (EVP_EncryptUpdate (cctx, |
356 | (unsigned char *) data + outl, &outl2, |
460 | (unsigned char *) data + outl, &outl2, |
357 | (unsigned char *) &datahdr, DATAHDR); |
461 | (unsigned char *) &datahdr, DATAHDR)); |
358 | outl += outl2; |
462 | outl += outl2; |
359 | |
463 | |
360 | EVP_EncryptUpdate (cctx, |
464 | require (EVP_EncryptUpdate (cctx, |
361 | (unsigned char *) data + outl, &outl2, |
465 | (unsigned char *) data + outl, &outl2, |
362 | (unsigned char *) d, l); |
466 | (unsigned char *) d, l)); |
363 | outl += outl2; |
467 | outl += outl2; |
364 | |
468 | |
365 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
469 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
366 | outl += outl2; |
470 | outl += outl2; |
367 | |
471 | |
368 | len = outl + data_hdr_size (); |
472 | len = outl + data_hdr_size (); |
369 | |
473 | |
370 | set_hdr (type, dst); |
474 | set_hdr (type, dst); |
… | |
… | |
379 | int outl = 0, outl2; |
483 | int outl = 0, outl2; |
380 | tap_packet *p = new tap_packet; |
484 | tap_packet *p = new tap_packet; |
381 | u8 *d; |
485 | u8 *d; |
382 | u32 l = len - data_hdr_size (); |
486 | u32 l = len - data_hdr_size (); |
383 | |
487 | |
384 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
488 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
385 | |
489 | |
386 | #if ENABLE_COMPRESSION |
490 | #if ENABLE_COMPRESSION |
387 | u8 cdata[MAX_MTU]; |
491 | u8 cdata[MAX_MTU]; |
388 | |
492 | |
389 | if (type == PT_DATA_COMPRESSED) |
493 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
391 | else |
495 | else |
392 | #endif |
496 | #endif |
393 | d = &(*p)[6 + 6 - DATAHDR]; |
497 | d = &(*p)[6 + 6 - DATAHDR]; |
394 | |
498 | |
395 | /* this overwrites part of the src mac, but we fix that later */ |
499 | /* this overwrites part of the src mac, but we fix that later */ |
396 | EVP_DecryptUpdate (cctx, |
500 | require (EVP_DecryptUpdate (cctx, |
397 | d, &outl2, |
501 | d, &outl2, |
398 | (unsigned char *)&data, len - data_hdr_size ()); |
502 | (unsigned char *)&data, len - data_hdr_size ())); |
399 | outl += outl2; |
503 | outl += outl2; |
400 | |
504 | |
401 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
505 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
402 | outl += outl2; |
506 | outl += outl2; |
403 | |
507 | |
404 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
508 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
405 | |
509 | |
406 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
510 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
435 | { |
539 | { |
436 | // actually, hmaclen cannot be checked because the hmac |
540 | // actually, hmaclen cannot be checked because the hmac |
437 | // field comes before this data, so peers with other |
541 | // field comes before this data, so peers with other |
438 | // hmacs simply will not work. |
542 | // hmacs simply will not work. |
439 | u8 prot_major, prot_minor, randsize, hmaclen; |
543 | u8 prot_major, prot_minor, randsize, hmaclen; |
440 | u8 flags, challengelen, pad2, pad3; |
544 | u8 flags, challengelen, features, pad3; |
441 | u32 cipher_nid, digest_nid, hmac_nid; |
545 | u32 cipher_nid, digest_nid, hmac_nid; |
442 | |
|
|
443 | const u8 curflags () const |
|
|
444 | { |
|
|
445 | return 0x80 |
|
|
446 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
447 | } |
|
|
448 | |
546 | |
449 | void setup (ptype type, int dst); |
547 | void setup (ptype type, int dst); |
450 | bool chk_config () const; |
548 | bool chk_config () const; |
|
|
549 | |
|
|
550 | static u8 get_features () |
|
|
551 | { |
|
|
552 | u8 f = 0; |
|
|
553 | #if ENABLE_COMPRESSION |
|
|
554 | f |= FEATURE_COMPRESSION; |
|
|
555 | #endif |
|
|
556 | #if ENABLE_ROHC |
|
|
557 | f |= FEATURE_ROHC; |
|
|
558 | #endif |
|
|
559 | #if ENABLE_BRIDGING |
|
|
560 | f |= FEATURE_BRIDGING; |
|
|
561 | #endif |
|
|
562 | return f; |
|
|
563 | } |
451 | }; |
564 | }; |
452 | |
565 | |
453 | void config_packet::setup (ptype type, int dst) |
566 | void config_packet::setup (ptype type, int dst) |
454 | { |
567 | { |
455 | prot_major = PROTOCOL_MAJOR; |
568 | prot_major = PROTOCOL_MAJOR; |
456 | prot_minor = PROTOCOL_MINOR; |
569 | prot_minor = PROTOCOL_MINOR; |
457 | randsize = RAND_SIZE; |
570 | randsize = RAND_SIZE; |
458 | hmaclen = HMACLENGTH; |
571 | hmaclen = HMACLENGTH; |
459 | flags = curflags (); |
572 | flags = 0; |
460 | challengelen = sizeof (rsachallenge); |
573 | challengelen = sizeof (rsachallenge); |
|
|
574 | features = get_features (); |
461 | |
575 | |
462 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
576 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
463 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
577 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
464 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
578 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
465 | |
579 | |
… | |
… | |
467 | set_hdr (type, dst); |
581 | set_hdr (type, dst); |
468 | } |
582 | } |
469 | |
583 | |
470 | bool config_packet::chk_config () const |
584 | bool config_packet::chk_config () const |
471 | { |
585 | { |
472 | return prot_major == PROTOCOL_MAJOR |
586 | if (prot_major != PROTOCOL_MAJOR) |
473 | && randsize == RAND_SIZE |
587 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
474 | && hmaclen == HMACLENGTH |
588 | else if (randsize != RAND_SIZE) |
475 | && flags == curflags () |
589 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
|
|
590 | else if (hmaclen != HMACLENGTH) |
|
|
591 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
476 | && challengelen == sizeof (rsachallenge) |
592 | else if (challengelen != sizeof (rsachallenge)) |
|
|
593 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
477 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
594 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
|
|
595 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
478 | && digest_nid == htonl (EVP_MD_type (RSA_HASH)) |
596 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
|
|
597 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
479 | && hmac_nid == htonl (EVP_MD_type (DIGEST)); |
598 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
|
|
599 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
|
|
600 | else |
|
|
601 | return true; |
|
|
602 | |
|
|
603 | return false; |
480 | } |
604 | } |
481 | |
605 | |
482 | struct auth_req_packet : config_packet |
606 | struct auth_req_packet : config_packet |
483 | { |
607 | { |
484 | char magic[8]; |
608 | char magic[8]; |
485 | u8 initiate; // false if this is just an automatic reply |
609 | u8 initiate; // false if this is just an automatic reply |
486 | u8 protocols; // supported protocols (will get patches on forward) |
610 | u8 protocols; // supported protocols (will be patched on forward) |
487 | u8 pad2, pad3; |
611 | u8 pad2, pad3; |
488 | rsaid id; |
612 | rsaid id; |
489 | rsaencrdata encr; |
613 | rsaencrdata encr; |
490 | |
614 | |
491 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
615 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
546 | }; |
670 | }; |
547 | |
671 | |
548 | ///////////////////////////////////////////////////////////////////////////// |
672 | ///////////////////////////////////////////////////////////////////////////// |
549 | |
673 | |
550 | void |
674 | void |
|
|
675 | connection::connection_established () |
|
|
676 | { |
|
|
677 | slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
|
|
678 | |
|
|
679 | if (ictx && octx) |
|
|
680 | { |
|
|
681 | // make sure rekeying timeouts are slightly asymmetric |
|
|
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
|
|
683 | rekey.start (rekey_interval, rekey_interval); |
|
|
684 | keepalive.start (::conf.keepalive); |
|
|
685 | |
|
|
686 | // send queued packets |
|
|
687 | if (ictx && octx) |
|
|
688 | { |
|
|
689 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
|
|
690 | { |
|
|
691 | if (p->len) send_data_packet (p); |
|
|
692 | delete p; |
|
|
693 | } |
|
|
694 | |
|
|
695 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
696 | { |
|
|
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
698 | delete p; |
|
|
699 | } |
|
|
700 | } |
|
|
701 | |
|
|
702 | vpn->connection_established (this); |
|
|
703 | } |
|
|
704 | else |
|
|
705 | { |
|
|
706 | retry_cnt = 0; |
|
|
707 | establish_connection.start (5); |
|
|
708 | keepalive.stop (); |
|
|
709 | rekey.stop (); |
|
|
710 | } |
|
|
711 | } |
|
|
712 | |
|
|
713 | void |
551 | connection::reset_si () |
714 | connection::reset_si () |
552 | { |
715 | { |
|
|
716 | if (vpn->can_direct (THISNODE, conf)) |
553 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
717 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
554 | |
718 | else |
555 | // mask out protocols we cannot establish |
719 | { |
556 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
720 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
557 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
721 | protocol = 0; |
|
|
722 | } |
558 | |
723 | |
559 | si.set (conf, protocol); |
724 | si.set (conf, protocol); |
|
|
725 | |
|
|
726 | is_direct = si.valid (); |
560 | } |
727 | } |
561 | |
728 | |
562 | // ensure sockinfo is valid, forward if necessary |
729 | // ensure sockinfo is valid, forward if necessary |
563 | const sockinfo & |
730 | const sockinfo & |
564 | connection::forward_si (const sockinfo &si) const |
731 | connection::forward_si (const sockinfo &si) const |
565 | { |
732 | { |
566 | if (!si.valid ()) |
733 | if (!si.valid ()) |
567 | { |
734 | { |
568 | connection *r = vpn->find_router (); |
735 | connection *r = vpn->find_router_for (this); |
569 | |
736 | |
570 | if (r) |
737 | if (r) |
571 | { |
738 | { |
572 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
739 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
573 | conf->nodename, r->conf->nodename); |
740 | conf->nodename, r->conf->nodename); |
574 | return r->si; |
741 | return r->si; |
575 | } |
742 | } |
576 | else |
743 | else |
577 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
744 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
578 | conf->nodename); |
745 | conf->nodename); |
579 | } |
746 | } |
580 | |
747 | |
581 | return si; |
748 | return si; |
582 | } |
749 | } |
583 | |
750 | |
584 | void |
751 | void |
|
|
752 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
753 | { |
|
|
754 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
|
|
755 | reset_connection (); |
|
|
756 | } |
|
|
757 | |
|
|
758 | void |
585 | connection::send_ping (const sockinfo &si, u8 pong) |
759 | connection::send_ping (const sockinfo &si, u8 pong) |
586 | { |
760 | { |
587 | ping_packet *pkt = new ping_packet; |
761 | ping_packet *pkt = new ping_packet; |
588 | |
762 | |
589 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
763 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
764 | |
|
|
765 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
|
|
766 | |
590 | vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
767 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
591 | |
768 | |
592 | delete pkt; |
769 | delete pkt; |
593 | } |
770 | } |
594 | |
771 | |
595 | void |
772 | void |
… | |
… | |
598 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
775 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
599 | { |
776 | { |
600 | config_packet *pkt = new config_packet; |
777 | config_packet *pkt = new config_packet; |
601 | |
778 | |
602 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
779 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
603 | vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST); |
780 | send_vpn_packet (pkt, si, IPTOS_MINCOST); |
604 | |
781 | |
605 | delete pkt; |
782 | delete pkt; |
606 | } |
783 | } |
607 | } |
784 | } |
608 | |
785 | |
… | |
… | |
610 | connection::send_auth_request (const sockinfo &si, bool initiate) |
787 | connection::send_auth_request (const sockinfo &si, bool initiate) |
611 | { |
788 | { |
612 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
789 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
613 | |
790 | |
614 | rsachallenge chg; |
791 | rsachallenge chg; |
615 | |
|
|
616 | rsa_cache.gen (pkt->id, chg); |
792 | rsa_cache.gen (pkt->id, chg); |
|
|
793 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
617 | |
794 | |
618 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
619 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
620 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
621 | fatal ("RSA_public_encrypt error"); |
|
|
622 | |
|
|
623 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
795 | slog (L_TRACE, "%s >> PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
624 | |
796 | |
625 | vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
797 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
626 | |
|
|
627 | |
798 | |
628 | delete pkt; |
799 | delete pkt; |
629 | } |
800 | } |
630 | |
801 | |
631 | void |
802 | void |
… | |
… | |
637 | |
808 | |
638 | rsa_hash (id, chg, pkt->response); |
809 | rsa_hash (id, chg, pkt->response); |
639 | |
810 | |
640 | pkt->hmac_set (octx); |
811 | pkt->hmac_set (octx); |
641 | |
812 | |
642 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
813 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
643 | |
814 | |
644 | vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
815 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
645 | |
816 | |
646 | delete pkt; |
817 | delete pkt; |
647 | } |
818 | } |
648 | |
819 | |
649 | void |
820 | void |
650 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
651 | { |
822 | { |
652 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
823 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename, |
653 | conf->id, rid, (const char *)rsi); |
824 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi); |
654 | |
825 | |
655 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
826 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
656 | |
827 | |
657 | r->hmac_set (octx); |
828 | r->hmac_set (octx); |
658 | vpn->send_vpn_packet (r, si); |
829 | send_vpn_packet (r, si); |
659 | |
830 | |
660 | delete r; |
831 | delete r; |
661 | } |
832 | } |
662 | |
833 | |
663 | void |
834 | inline void |
664 | connection::establish_connection_cb (time_watcher &w) |
835 | connection::establish_connection_cb (ev::timer &w, int revents) |
665 | { |
836 | { |
666 | if (ictx || conf == THISNODE |
837 | if (!ictx |
|
|
838 | && conf != THISNODE |
667 | || connectmode == conf_node::C_NEVER |
839 | && connectmode != conf_node::C_NEVER |
668 | || connectmode == conf_node::C_DISABLED) |
840 | && connectmode != conf_node::C_DISABLED |
669 | w.at = TSTAMP_CANCEL; |
841 | && !w.is_active ()) |
670 | else if (w.at <= NOW) |
|
|
671 | { |
842 | { |
672 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
843 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
673 | |
844 | // and stop trying. should probably be handled by a per-connection expire handler. |
674 | if (retry_int < 3600 * 8) |
845 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
846 | { |
|
|
847 | reset_connection (); |
675 | retry_cnt++; |
848 | return; |
|
|
849 | } |
676 | |
850 | |
677 | w.at = NOW + retry_int; |
851 | last_establish_attempt = ev_now (); |
|
|
852 | |
|
|
853 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
|
|
854 | ? (retry_cnt & 3) + 1 |
|
|
855 | : 1 << (retry_cnt >> 2)); |
678 | |
856 | |
679 | reset_si (); |
857 | reset_si (); |
680 | |
858 | |
681 | if (si.prot && !si.host) |
859 | bool slow = si.prot & PROT_SLOW; |
|
|
860 | |
|
|
861 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
|
|
862 | { |
|
|
863 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
864 | w.start (1); |
682 | vpn->connect_request (conf->id); |
865 | vpn->send_connect_request (this); |
|
|
866 | } |
683 | else |
867 | else |
684 | { |
868 | { |
|
|
869 | if (si.valid ()) |
|
|
870 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
871 | conf->nodename, (const char *)si); |
|
|
872 | |
685 | const sockinfo &dsi = forward_si (si); |
873 | const sockinfo &dsi = forward_si (si); |
|
|
874 | |
|
|
875 | slow = slow || (dsi.prot & PROT_SLOW); |
686 | |
876 | |
687 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
877 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
688 | { |
878 | { |
689 | if (retry_cnt < 4) |
879 | if (retry_cnt < 4) |
690 | send_auth_request (dsi, true); |
880 | send_auth_request (dsi, true); |
691 | else |
881 | else |
692 | send_ping (dsi, 0); |
882 | send_ping (dsi, 0); |
693 | } |
883 | } |
694 | } |
884 | } |
|
|
885 | |
|
|
886 | retry_int *= slow ? 8. : 0.9; |
|
|
887 | |
|
|
888 | if (retry_int < conf->max_retry) |
|
|
889 | retry_cnt++; |
|
|
890 | else |
|
|
891 | retry_int = conf->max_retry; |
|
|
892 | |
|
|
893 | w.start (retry_int); |
695 | } |
894 | } |
696 | } |
895 | } |
697 | |
896 | |
698 | void |
897 | void |
699 | connection::reset_connection () |
898 | connection::reset_connection () |
… | |
… | |
702 | { |
901 | { |
703 | slog (L_INFO, _("%s(%s): connection lost"), |
902 | slog (L_INFO, _("%s(%s): connection lost"), |
704 | conf->nodename, (const char *)si); |
903 | conf->nodename, (const char *)si); |
705 | |
904 | |
706 | if (::conf.script_node_down) |
905 | if (::conf.script_node_down) |
707 | run_script (run_script_cb (this, &connection::script_node_down), false); |
906 | { |
|
|
907 | run_script_cb *cb = new run_script_cb; |
|
|
908 | cb->set<connection, &connection::script_node_down> (this); |
|
|
909 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
910 | } |
708 | } |
911 | } |
709 | |
912 | |
710 | delete ictx; ictx = 0; |
913 | delete ictx; ictx = 0; |
711 | delete octx; octx = 0; |
914 | delete octx; octx = 0; |
|
|
915 | #if ENABLE_DNS |
|
|
916 | dnsv4_reset_connection (); |
|
|
917 | #endif |
712 | |
918 | |
713 | si.host= 0; |
919 | si.host = 0; |
714 | |
920 | |
715 | last_activity = 0; |
921 | last_activity = 0.; |
|
|
922 | //last_si_change = 0.; |
716 | retry_cnt = 0; |
923 | retry_cnt = 0; |
717 | |
924 | |
718 | rekey.reset (); |
925 | rekey.stop (); |
719 | keepalive.reset (); |
926 | keepalive.stop (); |
720 | establish_connection.reset (); |
927 | establish_connection.stop (); |
721 | } |
928 | } |
722 | |
929 | |
723 | void |
930 | void |
724 | connection::shutdown () |
931 | connection::shutdown () |
725 | { |
932 | { |
… | |
… | |
727 | send_reset (si); |
934 | send_reset (si); |
728 | |
935 | |
729 | reset_connection (); |
936 | reset_connection (); |
730 | } |
937 | } |
731 | |
938 | |
732 | void |
939 | // poor-man's rekeying |
733 | connection::rekey_cb (time_watcher &w) |
940 | inline void |
|
|
941 | connection::rekey_cb (ev::timer &w, int revents) |
734 | { |
942 | { |
735 | w.at = TSTAMP_CANCEL; |
|
|
736 | |
|
|
737 | reset_connection (); |
943 | reset_connection (); |
738 | establish_connection (); |
944 | establish_connection (); |
739 | } |
945 | } |
740 | |
946 | |
741 | void |
947 | void |
742 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
948 | connection::send_data_packet (tap_packet *pkt) |
743 | { |
949 | { |
744 | vpndata_packet *p = new vpndata_packet; |
950 | vpndata_packet *p = new vpndata_packet; |
745 | int tos = 0; |
951 | int tos = 0; |
746 | |
952 | |
747 | if (conf->inherit_tos |
953 | // I am not hilarious about peeking into packets, but so be it. |
748 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
954 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
749 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
750 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
955 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
751 | |
956 | |
752 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
957 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
753 | vpn->send_vpn_packet (p, si, tos); |
958 | send_vpn_packet (p, si, tos); |
754 | |
959 | |
755 | delete p; |
960 | delete p; |
756 | |
961 | |
757 | if (oseqno > MAX_SEQNO) |
962 | if (oseqno > MAX_SEQNO) |
758 | rekey (); |
963 | rekey (); |
759 | } |
964 | } |
760 | |
965 | |
761 | void |
966 | void |
|
|
967 | connection::post_inject_queue () |
|
|
968 | { |
|
|
969 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
970 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
971 | establish_connection.stop (); |
|
|
972 | |
|
|
973 | establish_connection (); |
|
|
974 | } |
|
|
975 | |
|
|
976 | void |
762 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
977 | connection::inject_data_packet (tap_packet *pkt) |
763 | { |
978 | { |
764 | if (ictx && octx) |
979 | if (ictx && octx) |
765 | send_data_packet (pkt, broadcast); |
980 | send_data_packet (pkt); |
766 | else |
981 | else |
767 | { |
982 | { |
768 | if (!broadcast)//DDDD |
|
|
769 | queue.put (new tap_packet (*pkt)); |
983 | data_queue.put (new tap_packet (*pkt)); |
770 | |
984 | post_inject_queue (); |
771 | establish_connection (); |
|
|
772 | } |
985 | } |
773 | } |
986 | } |
774 | |
987 | |
775 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
988 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
776 | { |
989 | { |
777 | if (ictx && octx) |
990 | if (ictx && octx) |
778 | vpn->send_vpn_packet (pkt, si, tos); |
991 | send_vpn_packet (pkt, si, tos); |
779 | else |
992 | else |
780 | establish_connection (); |
993 | { |
|
|
994 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
|
|
995 | post_inject_queue (); |
|
|
996 | } |
781 | } |
997 | } |
782 | |
998 | |
783 | void |
999 | void |
784 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1000 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
785 | { |
1001 | { |
786 | last_activity = NOW; |
1002 | last_activity = ev_now (); |
787 | |
1003 | |
788 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1004 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
789 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1005 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1006 | |
|
|
1007 | if (connectmode == conf_node::C_DISABLED) |
|
|
1008 | return; |
790 | |
1009 | |
791 | switch (pkt->typ ()) |
1010 | switch (pkt->typ ()) |
792 | { |
1011 | { |
793 | case vpn_packet::PT_PING: |
1012 | case vpn_packet::PT_PING: |
|
|
1013 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1014 | |
794 | // we send pings instead of auth packets after some retries, |
1015 | // we send pings instead of auth packets after some retries, |
795 | // so reset the retry counter and establish a connection |
1016 | // so reset the retry counter and establish a connection |
796 | // when we receive a ping. |
1017 | // when we receive a ping. |
797 | if (!ictx) |
1018 | if (!ictx) |
798 | { |
1019 | { |
799 | if (auth_rate_limiter.can (rsi)) |
1020 | if (auth_rate_limiter.can (rsi)) |
800 | send_auth_request (rsi, true); |
1021 | send_auth_request (rsi, true); |
801 | } |
1022 | } |
802 | else |
1023 | else |
|
|
1024 | // we would love to change thre socket address here, but ping's aren't |
|
|
1025 | // authenticated, so we best ignore it. |
803 | send_ping (rsi, 1); // pong |
1026 | send_ping (rsi, 1); // pong |
804 | |
1027 | |
805 | break; |
1028 | break; |
806 | |
1029 | |
807 | case vpn_packet::PT_PONG: |
1030 | case vpn_packet::PT_PONG: |
|
|
1031 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
808 | break; |
1032 | break; |
809 | |
1033 | |
810 | case vpn_packet::PT_RESET: |
1034 | case vpn_packet::PT_RESET: |
811 | { |
1035 | { |
812 | reset_connection (); |
1036 | reset_connection (); |
813 | |
1037 | |
814 | config_packet *p = (config_packet *) pkt; |
1038 | config_packet *p = (config_packet *) pkt; |
815 | |
1039 | |
816 | if (!p->chk_config ()) |
1040 | if (!p->chk_config ()) |
817 | { |
1041 | { |
818 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1042 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
819 | conf->nodename, (const char *)rsi); |
1043 | conf->nodename, (const char *)rsi); |
820 | connectmode = conf_node::C_DISABLED; |
1044 | connectmode = conf_node::C_DISABLED; |
821 | } |
1045 | } |
822 | else if (connectmode == conf_node::C_ALWAYS) |
1046 | else if (connectmode == conf_node::C_ALWAYS) |
823 | establish_connection (); |
1047 | establish_connection (); |
… | |
… | |
827 | case vpn_packet::PT_AUTH_REQ: |
1051 | case vpn_packet::PT_AUTH_REQ: |
828 | if (auth_rate_limiter.can (rsi)) |
1052 | if (auth_rate_limiter.can (rsi)) |
829 | { |
1053 | { |
830 | auth_req_packet *p = (auth_req_packet *) pkt; |
1054 | auth_req_packet *p = (auth_req_packet *) pkt; |
831 | |
1055 | |
832 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1056 | slog (L_TRACE, "%s << PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply"); |
833 | |
1057 | |
834 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1058 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
835 | { |
1059 | { |
836 | if (p->prot_minor != PROTOCOL_MINOR) |
1060 | if (p->prot_minor != PROTOCOL_MINOR) |
837 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1061 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
841 | if (p->initiate) |
1065 | if (p->initiate) |
842 | send_auth_request (rsi, false); |
1066 | send_auth_request (rsi, false); |
843 | |
1067 | |
844 | rsachallenge k; |
1068 | rsachallenge k; |
845 | |
1069 | |
846 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
1070 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
847 | (unsigned char *)&p->encr, (unsigned char *)&k, |
1071 | { |
848 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
849 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
1072 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
850 | conf->nodename, (const char *)rsi); |
1073 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
1074 | break; |
|
|
1075 | } |
851 | else |
1076 | else |
852 | { |
1077 | { |
853 | retry_cnt = 0; |
|
|
854 | establish_connection.start (NOW + 8); //? ;) |
|
|
855 | keepalive.reset (); |
|
|
856 | rekey.reset (); |
|
|
857 | |
|
|
858 | delete ictx; |
|
|
859 | ictx = 0; |
|
|
860 | |
|
|
861 | delete octx; |
1078 | delete octx; |
862 | |
1079 | |
863 | octx = new crypto_ctx (k, 1); |
1080 | octx = new crypto_ctx (k, 1); |
864 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1081 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
865 | |
1082 | |
866 | conf->protocols = p->protocols; |
1083 | conf->protocols = p->protocols; |
|
|
1084 | features = p->features & config_packet::get_features (); |
|
|
1085 | |
867 | send_auth_response (rsi, p->id, k); |
1086 | send_auth_response (rsi, p->id, k); |
|
|
1087 | |
|
|
1088 | connection_established (); |
868 | |
1089 | |
869 | break; |
1090 | break; |
870 | } |
1091 | } |
871 | } |
1092 | } |
|
|
1093 | else |
|
|
1094 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
|
|
1095 | conf->nodename, (const char *)rsi); |
872 | |
1096 | |
873 | send_reset (rsi); |
1097 | send_reset (rsi); |
874 | } |
1098 | } |
875 | |
1099 | |
876 | break; |
1100 | break; |
877 | |
1101 | |
878 | case vpn_packet::PT_AUTH_RES: |
1102 | case vpn_packet::PT_AUTH_RES: |
879 | { |
1103 | { |
880 | auth_res_packet *p = (auth_res_packet *) pkt; |
1104 | auth_res_packet *p = (auth_res_packet *)pkt; |
881 | |
1105 | |
882 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1106 | slog (L_TRACE, "%s << PT_AUTH_RES", conf->nodename); |
883 | |
1107 | |
884 | if (p->chk_config ()) |
1108 | if (p->chk_config ()) |
885 | { |
1109 | { |
886 | if (p->prot_minor != PROTOCOL_MINOR) |
1110 | if (p->prot_minor != PROTOCOL_MINOR) |
887 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1111 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
889 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1113 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
890 | |
1114 | |
891 | rsachallenge chg; |
1115 | rsachallenge chg; |
892 | |
1116 | |
893 | if (!rsa_cache.find (p->id, chg)) |
1117 | if (!rsa_cache.find (p->id, chg)) |
|
|
1118 | { |
894 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
1119 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
895 | conf->nodename, (const char *)rsi); |
1120 | conf->nodename, (const char *)rsi); |
|
|
1121 | break; |
|
|
1122 | } |
896 | else |
1123 | else |
897 | { |
1124 | { |
898 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1125 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
899 | |
1126 | |
900 | if (!p->hmac_chk (cctx)) |
1127 | if (!p->hmac_chk (cctx)) |
|
|
1128 | { |
901 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1129 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
902 | "could be an attack, or just corruption or an synchronization error"), |
1130 | "could be an attack, or just corruption or a synchronization error."), |
903 | conf->nodename, (const char *)rsi); |
1131 | conf->nodename, (const char *)rsi); |
|
|
1132 | break; |
|
|
1133 | } |
904 | else |
1134 | else |
905 | { |
1135 | { |
906 | rsaresponse h; |
1136 | rsaresponse h; |
907 | |
1137 | |
908 | rsa_hash (p->id, chg, h); |
1138 | rsa_hash (p->id, chg, h); |
… | |
… | |
916 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1146 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
917 | |
1147 | |
918 | si = rsi; |
1148 | si = rsi; |
919 | protocol = rsi.prot; |
1149 | protocol = rsi.prot; |
920 | |
1150 | |
921 | rekey.start (NOW + ::conf.rekey); |
1151 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
922 | keepalive.start (NOW + ::conf.keepalive); |
1152 | conf->nodename, (const char *)rsi, |
|
|
1153 | is_direct ? "direct" : "routed", |
|
|
1154 | p->prot_major, p->prot_minor); |
923 | |
1155 | |
924 | // send queued packets |
1156 | connection_established (); |
925 | while (tap_packet *p = queue.get ()) |
1157 | |
|
|
1158 | if (::conf.script_node_up) |
926 | { |
1159 | { |
927 | send_data_packet (p); |
1160 | run_script_cb *cb = new run_script_cb; |
928 | delete p; |
1161 | cb->set<connection, &connection::script_node_up> (this); |
|
|
1162 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
929 | } |
1163 | } |
930 | |
|
|
931 | connectmode = conf->connectmode; |
|
|
932 | |
|
|
933 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
934 | conf->nodename, (const char *)rsi, |
|
|
935 | p->prot_major, p->prot_minor); |
|
|
936 | |
|
|
937 | if (::conf.script_node_up) |
|
|
938 | run_script (run_script_cb (this, &connection::script_node_up), false); |
|
|
939 | |
1164 | |
940 | break; |
1165 | break; |
941 | } |
1166 | } |
942 | else |
1167 | else |
943 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1168 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
944 | conf->nodename, (const char *)rsi); |
1169 | conf->nodename, (const char *)rsi); |
945 | } |
1170 | } |
946 | |
1171 | |
947 | delete cctx; |
1172 | delete cctx; |
948 | } |
1173 | } |
… | |
… | |
962 | |
1187 | |
963 | if (ictx && octx) |
1188 | if (ictx && octx) |
964 | { |
1189 | { |
965 | vpndata_packet *p = (vpndata_packet *)pkt; |
1190 | vpndata_packet *p = (vpndata_packet *)pkt; |
966 | |
1191 | |
967 | if (rsi == si) |
1192 | if (!p->hmac_chk (ictx)) |
|
|
1193 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
1194 | "could be an attack, or just corruption or a synchronization error."), |
|
|
1195 | conf->nodename, (const char *)rsi); |
|
|
1196 | else |
968 | { |
1197 | { |
969 | if (!p->hmac_chk (ictx)) |
|
|
970 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
971 | "could be an attack, or just corruption or an synchronization error"), |
|
|
972 | conf->nodename, (const char *)rsi); |
|
|
973 | else |
1198 | u32 seqno; |
|
|
1199 | tap_packet *d = p->unpack (this, seqno); |
|
|
1200 | int seqclass = iseqno.seqno_classify (seqno); |
|
|
1201 | |
|
|
1202 | if (seqclass == 0) // ok |
974 | { |
1203 | { |
975 | u32 seqno; |
1204 | vpn->tap->send (d); |
976 | tap_packet *d = p->unpack (this, seqno); |
|
|
977 | |
1205 | |
978 | if (iseqno.recv_ok (seqno)) |
1206 | if (si != rsi) |
979 | { |
1207 | { |
980 | vpn->tap->send (d); |
1208 | // fast re-sync on source address changes, useful especially for tcp/ip |
981 | |
1209 | //if (last_si_change < ev_now () + 5.) |
982 | if (p->dst () == 0) // re-broadcast |
|
|
983 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
984 | { |
1210 | // { |
|
|
1211 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
|
|
1212 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1213 | |
985 | connection *c = *i; |
1214 | si = rsi; |
986 | |
|
|
987 | if (c->conf != THISNODE && c->conf != conf) |
|
|
988 | c->inject_data_packet (d); |
|
|
989 | } |
1215 | // } |
990 | |
|
|
991 | delete d; |
1216 | //else |
992 | |
1217 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
993 | break; |
1218 | // conf->nodename, (const char *)si, (const char *)rsi); |
994 | } |
1219 | } |
995 | } |
1220 | } |
|
|
1221 | else if (seqclass == 1) // far history |
|
|
1222 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1223 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1224 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1225 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1226 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1227 | else if (seqclass == 3) // reset |
|
|
1228 | { |
|
|
1229 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1230 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1231 | send_reset (rsi); |
|
|
1232 | } |
|
|
1233 | |
|
|
1234 | delete d; |
|
|
1235 | break; |
996 | } |
1236 | } |
997 | else |
|
|
998 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi); |
|
|
999 | } |
1237 | } |
1000 | |
1238 | |
1001 | send_reset (rsi); |
1239 | send_reset (rsi); |
1002 | break; |
1240 | break; |
1003 | |
1241 | |
1004 | case vpn_packet::PT_CONNECT_REQ: |
1242 | case vpn_packet::PT_CONNECT_REQ: |
1005 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1243 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1006 | { |
1244 | { |
1007 | connect_req_packet *p = (connect_req_packet *) pkt; |
1245 | connect_req_packet *p = (connect_req_packet *) pkt; |
1008 | |
1246 | |
1009 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1247 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1010 | connection *c = vpn->conns[p->id - 1]; |
|
|
1011 | conf->protocols = p->protocols; |
|
|
1012 | |
|
|
1013 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1014 | conf->id, p->id, c->ictx && c->octx); |
|
|
1015 | |
|
|
1016 | if (c->ictx && c->octx) |
|
|
1017 | { |
1248 | { |
|
|
1249 | connection *c = vpn->conns[p->id - 1]; |
|
|
1250 | conf->protocols = p->protocols; |
|
|
1251 | |
|
|
1252 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s) [%d]", |
|
|
1253 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx); |
|
|
1254 | |
|
|
1255 | if (c->ictx && c->octx) |
|
|
1256 | { |
1018 | // send connect_info packets to both sides, in case one is |
1257 | // send connect_info packets to both sides, in case one is |
1019 | // behind a nat firewall (or both ;) |
1258 | // behind a nat firewall (or both ;) |
1020 | c->send_connect_info (conf->id, si, conf->protocols); |
1259 | c->send_connect_info (conf->id, si, conf->protocols); |
1021 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1260 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1261 | } |
|
|
1262 | else |
|
|
1263 | c->establish_connection (); |
1022 | } |
1264 | } |
|
|
1265 | else |
|
|
1266 | slog (L_WARN, |
|
|
1267 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1268 | p->id); |
1023 | } |
1269 | } |
1024 | |
1270 | |
1025 | break; |
1271 | break; |
1026 | |
1272 | |
1027 | case vpn_packet::PT_CONNECT_INFO: |
1273 | case vpn_packet::PT_CONNECT_INFO: |
1028 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1274 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1029 | { |
1275 | { |
1030 | connect_info_packet *p = (connect_info_packet *) pkt; |
1276 | connect_info_packet *p = (connect_info_packet *)pkt; |
1031 | |
1277 | |
1032 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1278 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1033 | |
1279 | { |
1034 | connection *c = vpn->conns[p->id - 1]; |
1280 | connection *c = vpn->conns[p->id - 1]; |
1035 | |
1281 | |
1036 | c->conf->protocols = p->protocols; |
1282 | c->conf->protocols = p->protocols; |
1037 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1283 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1038 | p->si.upgrade_protocol (protocol, c->conf); |
1284 | p->si.upgrade_protocol (protocol, c->conf); |
1039 | |
1285 | |
1040 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1286 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s) [%d]", |
|
|
1287 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
1041 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1288 | (const char *)p->si, !c->ictx && !c->octx); |
1042 | |
1289 | |
1043 | const sockinfo &dsi = forward_si (p->si); |
1290 | const sockinfo &dsi = forward_si (p->si); |
1044 | |
1291 | |
1045 | if (dsi.valid ()) |
1292 | if (dsi.valid ()) |
1046 | c->send_auth_request (dsi, true); |
1293 | c->send_auth_request (dsi, true); |
|
|
1294 | } |
|
|
1295 | else |
|
|
1296 | slog (L_WARN, |
|
|
1297 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1298 | p->id); |
1047 | } |
1299 | } |
1048 | |
1300 | |
1049 | break; |
1301 | break; |
1050 | |
1302 | |
1051 | default: |
1303 | default: |
1052 | send_reset (rsi); |
1304 | send_reset (rsi); |
1053 | break; |
1305 | break; |
1054 | } |
1306 | } |
1055 | } |
1307 | } |
1056 | |
1308 | |
1057 | void connection::keepalive_cb (time_watcher &w) |
1309 | inline void |
|
|
1310 | connection::keepalive_cb (ev::timer &w, int revents) |
1058 | { |
1311 | { |
1059 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1312 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1060 | { |
1313 | { |
1061 | reset_connection (); |
1314 | reset_connection (); |
1062 | establish_connection (); |
1315 | establish_connection (); |
1063 | } |
1316 | } |
1064 | else if (NOW < last_activity + ::conf.keepalive) |
1317 | else if (ev_now () < last_activity + ::conf.keepalive) |
1065 | w.at = last_activity + ::conf.keepalive; |
1318 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1066 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1319 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1067 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1320 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1068 | { |
1321 | { |
1069 | send_ping (si); |
1322 | send_ping (si); |
1070 | w.at = NOW + 5; |
1323 | w.start (5); |
1071 | } |
1324 | } |
|
|
1325 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
|
|
1326 | // hold ondemand connections implicitly a few seconds longer |
|
|
1327 | // should delete octx, though, or something like that ;) |
|
|
1328 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1072 | else |
1329 | else |
1073 | reset_connection (); |
1330 | reset_connection (); |
1074 | } |
1331 | } |
1075 | |
1332 | |
1076 | void connection::connect_request (int id) |
1333 | void connection::send_connect_request (int id) |
1077 | { |
1334 | { |
1078 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1335 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1079 | |
1336 | |
1080 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1337 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s)", |
|
|
1338 | conf->nodename, vpn->conns[id - 1]->conf->nodename); |
1081 | p->hmac_set (octx); |
1339 | p->hmac_set (octx); |
1082 | vpn->send_vpn_packet (p, si); |
1340 | send_vpn_packet (p, si); |
1083 | |
1341 | |
1084 | delete p; |
1342 | delete p; |
1085 | } |
1343 | } |
1086 | |
1344 | |
|
|
1345 | void connection::script_init_env (const char *ext) |
|
|
1346 | { |
|
|
1347 | char *env; |
|
|
1348 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1349 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1350 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1351 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1352 | conf->id & 0xff); putenv (env); |
|
|
1353 | } |
|
|
1354 | |
1087 | void connection::script_node () |
1355 | void connection::script_init_connect_env () |
1088 | { |
1356 | { |
1089 | vpn->script_if_up (); |
1357 | vpn->script_init_env (); |
1090 | |
1358 | |
1091 | char *env; |
1359 | char *env; |
1092 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1360 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1093 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1361 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1094 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1362 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1095 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1363 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1096 | } |
1364 | } |
1097 | |
1365 | |
|
|
1366 | inline const char * |
1098 | const char *connection::script_node_up () |
1367 | connection::script_node_up () |
1099 | { |
1368 | { |
1100 | script_node (); |
1369 | script_init_connect_env (); |
1101 | |
1370 | |
1102 | putenv ("STATE=up"); |
1371 | putenv ((char *)"STATE=up"); |
1103 | |
1372 | |
|
|
1373 | char *filename; |
|
|
1374 | asprintf (&filename, |
|
|
1375 | "%s/%s", |
|
|
1376 | confbase, |
1104 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1377 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1105 | } |
|
|
1106 | |
1378 | |
|
|
1379 | return filename; |
|
|
1380 | } |
|
|
1381 | |
|
|
1382 | inline const char * |
1107 | const char *connection::script_node_down () |
1383 | connection::script_node_down () |
1108 | { |
1384 | { |
1109 | script_node (); |
1385 | script_init_connect_env (); |
1110 | |
1386 | |
1111 | putenv ("STATE=down"); |
1387 | putenv ((char *)"STATE=down"); |
1112 | |
1388 | |
1113 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1389 | char *filename; |
1114 | } |
1390 | asprintf (&filename, |
|
|
1391 | "%s/%s", |
|
|
1392 | confbase, |
|
|
1393 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1115 | |
1394 | |
|
|
1395 | return filename; |
|
|
1396 | } |
|
|
1397 | |
1116 | connection::connection(struct vpn *vpn_) |
1398 | connection::connection (struct vpn *vpn, conf_node *conf) |
1117 | : vpn(vpn_) |
1399 | : vpn(vpn), conf(conf), |
1118 | , rekey (this, &connection::rekey_cb) |
1400 | #if ENABLE_DNS |
1119 | , keepalive (this, &connection::keepalive_cb) |
1401 | dns (0), |
|
|
1402 | #endif |
|
|
1403 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1404 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
|
|
1405 | { |
|
|
1406 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1407 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1120 | , establish_connection (this, &connection::establish_connection_cb) |
1408 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1121 | { |
1409 | |
|
|
1410 | last_establish_attempt = 0.; |
1122 | octx = ictx = 0; |
1411 | octx = ictx = 0; |
1123 | retry_cnt = 0; |
|
|
1124 | |
1412 | |
1125 | connectmode = conf_node::C_ALWAYS; // initial setting |
1413 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1414 | conf->protocols = PROT_UDPv4; |
|
|
1415 | |
|
|
1416 | connectmode = conf->connectmode; |
|
|
1417 | |
|
|
1418 | // queue a dummy packet to force an initial connection attempt |
|
|
1419 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1420 | vpn_queue.put (new net_packet); |
|
|
1421 | |
1126 | reset_connection (); |
1422 | reset_connection (); |
1127 | } |
1423 | } |
1128 | |
1424 | |
1129 | connection::~connection () |
1425 | connection::~connection () |
1130 | { |
1426 | { |