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 "gettext.h" |
38 | #include <openssl/rand.h> |
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39 | #include <openssl/evp.h> |
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40 | #include <openssl/rsa.h> |
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41 | #include <openssl/err.h> |
28 | |
42 | |
29 | #include "conf.h" |
43 | #include "conf.h" |
30 | #include "slog.h" |
44 | #include "slog.h" |
31 | #include "device.h" |
45 | #include "device.h" |
32 | #include "protocol.h" |
46 | #include "vpn.h" |
33 | #include "connection.h" |
47 | #include "connection.h" |
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48 | |
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49 | #include "netcompat.h" |
34 | |
50 | |
35 | #if !HAVE_RAND_PSEUDO_BYTES |
51 | #if !HAVE_RAND_PSEUDO_BYTES |
36 | # define RAND_pseudo_bytes RAND_bytes |
52 | # define RAND_pseudo_bytes RAND_bytes |
37 | #endif |
53 | #endif |
38 | |
54 | |
39 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
55 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
40 | |
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 | |
41 | struct crypto_ctx |
104 | struct crypto_ctx |
42 | { |
105 | { |
43 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
44 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
45 | |
108 | |
… | |
… | |
48 | }; |
111 | }; |
49 | |
112 | |
50 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
113 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
51 | { |
114 | { |
52 | EVP_CIPHER_CTX_init (&cctx); |
115 | EVP_CIPHER_CTX_init (&cctx); |
53 | 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)); |
54 | HMAC_CTX_init (&hctx); |
117 | HMAC_CTX_init (&hctx); |
55 | 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); |
56 | } |
119 | } |
57 | |
120 | |
58 | crypto_ctx::~crypto_ctx () |
121 | crypto_ctx::~crypto_ctx () |
59 | { |
122 | { |
60 | EVP_CIPHER_CTX_cleanup (&cctx); |
123 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
61 | HMAC_CTX_cleanup (&hctx); |
124 | HMAC_CTX_cleanup (&hctx); |
62 | } |
125 | } |
63 | |
126 | |
64 | static void |
127 | static void |
65 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
128 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
66 | { |
129 | { |
67 | EVP_MD_CTX ctx; |
130 | EVP_MD_CTX ctx; |
68 | |
131 | |
69 | EVP_MD_CTX_init (&ctx); |
132 | EVP_MD_CTX_init (&ctx); |
70 | EVP_DigestInit (&ctx, RSA_HASH); |
133 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
71 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
134 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
72 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
135 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
73 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
136 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
74 | EVP_MD_CTX_cleanup (&ctx); |
137 | EVP_MD_CTX_cleanup (&ctx); |
75 | } |
138 | } |
76 | |
139 | |
77 | struct rsa_entry { |
140 | struct rsa_entry |
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141 | { |
78 | tstamp expire; |
142 | tstamp expire; |
79 | rsaid id; |
143 | rsaid id; |
80 | rsachallenge chg; |
144 | rsachallenge chg; |
81 | }; |
145 | }; |
82 | |
146 | |
83 | struct rsa_cache : list<rsa_entry> |
147 | struct rsa_cache : list<rsa_entry> |
84 | { |
148 | { |
85 | void cleaner_cb (tstamp &ts); time_watcher cleaner; |
149 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
86 | |
150 | |
87 | bool find (const rsaid &id, rsachallenge &chg) |
151 | bool find (const rsaid &id, rsachallenge &chg) |
88 | { |
152 | { |
89 | for (iterator i = begin (); i != end (); ++i) |
153 | for (iterator i = begin (); i != end (); ++i) |
90 | { |
154 | { |
91 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
155 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
92 | { |
156 | { |
93 | memcpy (&chg, &i->chg, sizeof chg); |
157 | memcpy (&chg, &i->chg, sizeof chg); |
94 | |
158 | |
95 | erase (i); |
159 | erase (i); |
96 | return true; |
160 | return true; |
97 | } |
161 | } |
98 | } |
162 | } |
99 | |
163 | |
100 | if (cleaner.at < NOW) |
164 | if (!cleaner.is_active ()) |
101 | cleaner.start (NOW + RSA_TTL); |
165 | cleaner.again (); |
102 | |
166 | |
103 | return false; |
167 | return false; |
104 | } |
168 | } |
105 | |
169 | |
106 | void gen (rsaid &id, rsachallenge &chg) |
170 | void gen (rsaid &id, rsachallenge &chg) |
107 | { |
171 | { |
108 | rsa_entry e; |
172 | rsa_entry e; |
109 | |
173 | |
110 | RAND_bytes ((unsigned char *)&id, sizeof id); |
174 | RAND_bytes ((unsigned char *)&id, sizeof id); |
111 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
175 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
112 | |
176 | |
113 | e.expire = NOW + RSA_TTL; |
177 | e.expire = ev_now () + RSA_TTL; |
114 | e.id = id; |
178 | e.id = id; |
115 | memcpy (&e.chg, &chg, sizeof chg); |
179 | memcpy (&e.chg, &chg, sizeof chg); |
116 | |
180 | |
117 | push_back (e); |
181 | push_back (e); |
118 | |
182 | |
119 | if (cleaner.at < NOW) |
183 | if (!cleaner.is_active ()) |
120 | cleaner.start (NOW + RSA_TTL); |
184 | cleaner.again (); |
121 | } |
185 | } |
122 | |
186 | |
123 | rsa_cache () |
187 | rsa_cache () |
124 | : cleaner (this, &rsa_cache::cleaner_cb) |
188 | { |
125 | { } |
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 | } |
126 | |
192 | |
127 | } rsa_cache; |
193 | } rsa_cache; |
128 | |
194 | |
129 | void rsa_cache::cleaner_cb (tstamp &ts) |
195 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
130 | { |
196 | { |
131 | if (empty ()) |
197 | if (empty ()) |
132 | ts = TSTAMP_CANCEL; |
198 | w.stop (); |
133 | else |
199 | else |
134 | { |
200 | { |
135 | ts = NOW + RSA_TTL; |
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136 | |
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137 | for (iterator i = begin (); i != end (); ) |
201 | for (iterator i = begin (); i != end (); ) |
138 | if (i->expire <= NOW) |
202 | if (i->expire <= ev_now ()) |
139 | i = erase (i); |
203 | i = erase (i); |
140 | else |
204 | else |
141 | ++i; |
205 | ++i; |
142 | } |
206 | } |
143 | } |
207 | } |
144 | |
208 | |
145 | ////////////////////////////////////////////////////////////////////////////// |
209 | ////////////////////////////////////////////////////////////////////////////// |
146 | |
210 | |
147 | 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) |
148 | { |
213 | { |
149 | if (queue[i]) |
214 | queue = new pkt [max_queue]; |
150 | { |
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151 | delete queue[i]; |
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152 | j = (j + 1) % QUEUEDEPTH; |
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153 | } |
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154 | |
215 | |
155 | queue[i] = p; |
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156 | |
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157 | i = (i + 1) % QUEUEDEPTH; |
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158 | } |
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159 | |
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160 | tap_packet *pkt_queue::get () |
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161 | { |
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162 | tap_packet *p = queue[j]; |
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163 | |
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164 | if (p) |
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165 | { |
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166 | queue[j] = 0; |
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167 | j = (j + 1) % QUEUEDEPTH; |
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168 | } |
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169 | |
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170 | return p; |
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171 | } |
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172 | |
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173 | pkt_queue::pkt_queue () |
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174 | { |
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175 | memset (queue, 0, sizeof (queue)); |
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176 | i = 0; |
216 | i = 0; |
177 | j = 0; |
217 | j = 0; |
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218 | |
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219 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
178 | } |
220 | } |
179 | |
221 | |
180 | pkt_queue::~pkt_queue () |
222 | pkt_queue::~pkt_queue () |
181 | { |
223 | { |
182 | for (i = QUEUEDEPTH; --i > 0; ) |
224 | while (net_packet *p = get ()) |
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225 | delete p; |
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226 | |
183 | delete queue[i]; |
227 | delete [] queue; |
184 | } |
228 | } |
185 | |
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 | |
186 | struct net_rateinfo { |
283 | struct net_rateinfo |
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284 | { |
187 | u32 host; |
285 | u32 host; |
188 | double pcnt, diff; |
286 | double pcnt, diff; |
189 | tstamp last; |
287 | tstamp last; |
190 | }; |
288 | }; |
191 | |
289 | |
192 | // 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. |
193 | // this implementation ("splay list" ;) is inefficient, |
291 | // this implementation ("splay list" ;) is inefficient, |
194 | // but low on resources. |
292 | // but low on resources. |
195 | struct net_rate_limiter : list<net_rateinfo> |
293 | struct net_rate_limiter : list<net_rateinfo> |
196 | { |
294 | { |
197 | static const double ALPHA = 1. - 1. / 90.; // allow bursts |
295 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
198 | static const double CUTOFF = 20.; // one event every CUTOFF seconds |
296 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
199 | 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 |
200 | |
299 | |
201 | bool can (const sockinfo &si) { return can((u32)si.host); } |
300 | bool can (const sockinfo &si) { return can((u32)si.host); } |
202 | bool can (u32 host); |
301 | bool can (u32 host); |
203 | }; |
302 | }; |
204 | |
303 | |
205 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
304 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
206 | |
305 | |
… | |
… | |
209 | iterator i; |
308 | iterator i; |
210 | |
309 | |
211 | for (i = begin (); i != end (); ) |
310 | for (i = begin (); i != end (); ) |
212 | if (i->host == host) |
311 | if (i->host == host) |
213 | break; |
312 | break; |
214 | else if (i->last < NOW - EXPIRE) |
313 | else if (i->last < ev_now () - NRL_EXPIRE) |
215 | i = erase (i); |
314 | i = erase (i); |
216 | else |
315 | else |
217 | i++; |
316 | i++; |
218 | |
317 | |
219 | if (i == end ()) |
318 | if (i == end ()) |
220 | { |
319 | { |
221 | net_rateinfo ri; |
320 | net_rateinfo ri; |
222 | |
321 | |
223 | ri.host = host; |
322 | ri.host = host; |
224 | ri.pcnt = 1.; |
323 | ri.pcnt = 1.; |
225 | ri.diff = CUTOFF * (1. / (1. - ALPHA)); |
324 | ri.diff = NRL_MAXDIF; |
226 | ri.last = NOW; |
325 | ri.last = ev_now (); |
227 | |
326 | |
228 | push_front (ri); |
327 | push_front (ri); |
229 | |
328 | |
230 | return true; |
329 | return true; |
231 | } |
330 | } |
232 | else |
331 | else |
233 | { |
332 | { |
234 | net_rateinfo ri (*i); |
333 | net_rateinfo ri (*i); |
235 | erase (i); |
334 | erase (i); |
236 | |
335 | |
237 | ri.pcnt = ri.pcnt * ALPHA; |
336 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
238 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
337 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
239 | |
338 | |
240 | ri.last = NOW; |
339 | ri.last = ev_now (); |
241 | |
340 | |
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341 | double dif = ri.diff / ri.pcnt; |
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342 | |
242 | bool send = ri.diff / ri.pcnt > CUTOFF; |
343 | bool send = dif > NRL_CUTOFF; |
243 | |
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 | } |
244 | if (send) |
350 | else if (send) |
245 | ri.pcnt++; |
351 | ri.pcnt++; |
246 | |
352 | |
247 | push_front (ri); |
353 | push_front (ri); |
248 | |
354 | |
249 | return send; |
355 | return send; |
… | |
… | |
280 | hmac_gen (ctx); |
386 | hmac_gen (ctx); |
281 | |
387 | |
282 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
388 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
283 | } |
389 | } |
284 | |
390 | |
285 | void vpn_packet::set_hdr (ptype type, unsigned int dst) |
391 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
286 | { |
392 | { |
287 | this->type = type; |
393 | type = type_; |
288 | |
394 | |
289 | int src = THISNODE->id; |
395 | int src = THISNODE->id; |
290 | |
396 | |
291 | src1 = src; |
397 | src1 = src; |
292 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
398 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
… | |
… | |
294 | } |
400 | } |
295 | |
401 | |
296 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
402 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
297 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
403 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
298 | |
404 | |
299 | struct vpndata_packet:vpn_packet |
405 | struct vpndata_packet : vpn_packet |
300 | { |
406 | { |
301 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
407 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
302 | |
408 | |
303 | 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); |
304 | tap_packet *unpack (connection *conn, u32 &seqno); |
410 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
317 | int outl = 0, outl2; |
423 | int outl = 0, outl2; |
318 | ptype type = PT_DATA_UNCOMPRESSED; |
424 | ptype type = PT_DATA_UNCOMPRESSED; |
319 | |
425 | |
320 | #if ENABLE_COMPRESSION |
426 | #if ENABLE_COMPRESSION |
321 | u8 cdata[MAX_MTU]; |
427 | u8 cdata[MAX_MTU]; |
322 | u32 cl; |
|
|
323 | |
428 | |
|
|
429 | if (conn->features & ENABLE_COMPRESSION) |
|
|
430 | { |
324 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
431 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
432 | |
325 | if (cl) |
433 | if (cl) |
326 | { |
434 | { |
327 | type = PT_DATA_COMPRESSED; |
435 | type = PT_DATA_COMPRESSED; |
328 | d = cdata; |
436 | d = cdata; |
329 | l = cl + 2; |
437 | l = cl + 2; |
330 | |
438 | |
331 | d[0] = cl >> 8; |
439 | d[0] = cl >> 8; |
332 | d[1] = cl; |
440 | d[1] = cl; |
|
|
441 | } |
333 | } |
442 | } |
334 | #endif |
443 | #endif |
335 | |
444 | |
336 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
445 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
337 | |
446 | |
338 | struct { |
447 | struct { |
339 | #if RAND_SIZE |
448 | #if RAND_SIZE |
340 | u8 rnd[RAND_SIZE]; |
449 | u8 rnd[RAND_SIZE]; |
341 | #endif |
450 | #endif |
… | |
… | |
345 | datahdr.seqno = ntohl (seqno); |
454 | datahdr.seqno = ntohl (seqno); |
346 | #if RAND_SIZE |
455 | #if RAND_SIZE |
347 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
456 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
348 | #endif |
457 | #endif |
349 | |
458 | |
350 | EVP_EncryptUpdate (cctx, |
459 | require (EVP_EncryptUpdate (cctx, |
351 | (unsigned char *) data + outl, &outl2, |
460 | (unsigned char *) data + outl, &outl2, |
352 | (unsigned char *) &datahdr, DATAHDR); |
461 | (unsigned char *) &datahdr, DATAHDR)); |
353 | outl += outl2; |
462 | outl += outl2; |
354 | |
463 | |
355 | EVP_EncryptUpdate (cctx, |
464 | require (EVP_EncryptUpdate (cctx, |
356 | (unsigned char *) data + outl, &outl2, |
465 | (unsigned char *) data + outl, &outl2, |
357 | (unsigned char *) d, l); |
466 | (unsigned char *) d, l)); |
358 | outl += outl2; |
467 | outl += outl2; |
359 | |
468 | |
360 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
469 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
361 | outl += outl2; |
470 | outl += outl2; |
362 | |
471 | |
363 | len = outl + data_hdr_size (); |
472 | len = outl + data_hdr_size (); |
364 | |
473 | |
365 | set_hdr (type, dst); |
474 | set_hdr (type, dst); |
… | |
… | |
374 | int outl = 0, outl2; |
483 | int outl = 0, outl2; |
375 | tap_packet *p = new tap_packet; |
484 | tap_packet *p = new tap_packet; |
376 | u8 *d; |
485 | u8 *d; |
377 | u32 l = len - data_hdr_size (); |
486 | u32 l = len - data_hdr_size (); |
378 | |
487 | |
379 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
488 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
380 | |
489 | |
381 | #if ENABLE_COMPRESSION |
490 | #if ENABLE_COMPRESSION |
382 | u8 cdata[MAX_MTU]; |
491 | u8 cdata[MAX_MTU]; |
383 | |
492 | |
384 | if (type == PT_DATA_COMPRESSED) |
493 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
386 | else |
495 | else |
387 | #endif |
496 | #endif |
388 | d = &(*p)[6 + 6 - DATAHDR]; |
497 | d = &(*p)[6 + 6 - DATAHDR]; |
389 | |
498 | |
390 | /* 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 */ |
391 | EVP_DecryptUpdate (cctx, |
500 | require (EVP_DecryptUpdate (cctx, |
392 | d, &outl2, |
501 | d, &outl2, |
393 | (unsigned char *)&data, len - data_hdr_size ()); |
502 | (unsigned char *)&data, len - data_hdr_size ())); |
394 | outl += outl2; |
503 | outl += outl2; |
395 | |
504 | |
396 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
505 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
397 | outl += outl2; |
506 | outl += outl2; |
398 | |
507 | |
399 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
508 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
400 | |
509 | |
401 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
510 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
430 | { |
539 | { |
431 | // actually, hmaclen cannot be checked because the hmac |
540 | // actually, hmaclen cannot be checked because the hmac |
432 | // field comes before this data, so peers with other |
541 | // field comes before this data, so peers with other |
433 | // hmacs simply will not work. |
542 | // hmacs simply will not work. |
434 | u8 prot_major, prot_minor, randsize, hmaclen; |
543 | u8 prot_major, prot_minor, randsize, hmaclen; |
435 | u8 flags, challengelen, pad2, pad3; |
544 | u8 flags, challengelen, features, pad3; |
436 | u32 cipher_nid, digest_nid, hmac_nid; |
545 | u32 cipher_nid, digest_nid, hmac_nid; |
437 | |
|
|
438 | const u8 curflags () const |
|
|
439 | { |
|
|
440 | return 0x80 |
|
|
441 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
442 | } |
|
|
443 | |
546 | |
444 | void setup (ptype type, int dst); |
547 | void setup (ptype type, int dst); |
445 | 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 | } |
446 | }; |
564 | }; |
447 | |
565 | |
448 | void config_packet::setup (ptype type, int dst) |
566 | void config_packet::setup (ptype type, int dst) |
449 | { |
567 | { |
450 | prot_major = PROTOCOL_MAJOR; |
568 | prot_major = PROTOCOL_MAJOR; |
451 | prot_minor = PROTOCOL_MINOR; |
569 | prot_minor = PROTOCOL_MINOR; |
452 | randsize = RAND_SIZE; |
570 | randsize = RAND_SIZE; |
453 | hmaclen = HMACLENGTH; |
571 | hmaclen = HMACLENGTH; |
454 | flags = curflags (); |
572 | flags = 0; |
455 | challengelen = sizeof (rsachallenge); |
573 | challengelen = sizeof (rsachallenge); |
|
|
574 | features = get_features (); |
456 | |
575 | |
457 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
576 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
458 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
577 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
459 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
578 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
460 | |
579 | |
… | |
… | |
462 | set_hdr (type, dst); |
581 | set_hdr (type, dst); |
463 | } |
582 | } |
464 | |
583 | |
465 | bool config_packet::chk_config () const |
584 | bool config_packet::chk_config () const |
466 | { |
585 | { |
467 | return prot_major == PROTOCOL_MAJOR |
586 | if (prot_major != PROTOCOL_MAJOR) |
468 | && randsize == RAND_SIZE |
587 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
469 | && hmaclen == HMACLENGTH |
588 | else if (randsize != RAND_SIZE) |
470 | && 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); |
471 | && challengelen == sizeof (rsachallenge) |
592 | else if (challengelen != sizeof (rsachallenge)) |
|
|
593 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
472 | && 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)); |
473 | && 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)); |
474 | && 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; |
475 | } |
604 | } |
476 | |
605 | |
477 | struct auth_req_packet : config_packet |
606 | struct auth_req_packet : config_packet |
478 | { |
607 | { |
479 | char magic[8]; |
608 | char magic[8]; |
480 | u8 initiate; // false if this is just an automatic reply |
609 | u8 initiate; // false if this is just an automatic reply |
481 | u8 protocols; // supported protocols (will get patches on forward) |
610 | u8 protocols; // supported protocols (will be patched on forward) |
482 | u8 pad2, pad3; |
611 | u8 pad2, pad3; |
483 | rsaid id; |
612 | rsaid id; |
484 | rsaencrdata encr; |
613 | rsaencrdata encr; |
485 | |
614 | |
486 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
615 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
541 | }; |
670 | }; |
542 | |
671 | |
543 | ///////////////////////////////////////////////////////////////////////////// |
672 | ///////////////////////////////////////////////////////////////////////////// |
544 | |
673 | |
545 | void |
674 | void |
|
|
675 | connection::connection_established () |
|
|
676 | { |
|
|
677 | slog (L_TRACE, _("%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 | else |
|
|
703 | { |
|
|
704 | retry_cnt = 0; |
|
|
705 | establish_connection.start (5); |
|
|
706 | keepalive.stop (); |
|
|
707 | rekey.stop (); |
|
|
708 | } |
|
|
709 | } |
|
|
710 | |
|
|
711 | void |
546 | connection::reset_dstaddr () |
712 | connection::reset_si () |
547 | { |
713 | { |
|
|
714 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
|
|
715 | |
|
|
716 | // mask out protocols we cannot establish |
|
|
717 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
718 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
719 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
720 | |
|
|
721 | if (protocol |
|
|
722 | && (!conf->can_direct (THISNODE) |
|
|
723 | || !THISNODE->can_direct (conf))) |
|
|
724 | { |
|
|
725 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
|
|
726 | protocol = 0; |
|
|
727 | } |
|
|
728 | |
548 | si.set (conf); |
729 | si.set (conf, protocol); |
|
|
730 | } |
|
|
731 | |
|
|
732 | // ensure sockinfo is valid, forward if necessary |
|
|
733 | const sockinfo & |
|
|
734 | connection::forward_si (const sockinfo &si) const |
|
|
735 | { |
|
|
736 | if (!si.valid ()) |
|
|
737 | { |
|
|
738 | connection *r = vpn->find_router (); |
|
|
739 | |
|
|
740 | if (r) |
|
|
741 | { |
|
|
742 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
|
|
743 | conf->nodename, r->conf->nodename, (const char *)r->si); |
|
|
744 | return r->si; |
|
|
745 | } |
|
|
746 | else |
|
|
747 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
|
|
748 | conf->nodename); |
|
|
749 | } |
|
|
750 | |
|
|
751 | return si; |
|
|
752 | } |
|
|
753 | |
|
|
754 | void |
|
|
755 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
756 | { |
|
|
757 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
|
|
758 | reset_connection (); |
549 | } |
759 | } |
550 | |
760 | |
551 | void |
761 | void |
552 | connection::send_ping (const sockinfo &si, u8 pong) |
762 | connection::send_ping (const sockinfo &si, u8 pong) |
553 | { |
763 | { |
… | |
… | |
576 | void |
786 | void |
577 | connection::send_auth_request (const sockinfo &si, bool initiate) |
787 | connection::send_auth_request (const sockinfo &si, bool initiate) |
578 | { |
788 | { |
579 | 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); |
580 | |
790 | |
581 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
|
|
582 | |
|
|
583 | rsachallenge chg; |
791 | rsachallenge chg; |
584 | |
|
|
585 | rsa_cache.gen (pkt->id, chg); |
792 | rsa_cache.gen (pkt->id, chg); |
586 | |
793 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
587 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
588 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
589 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
590 | fatal ("RSA_public_encrypt error"); |
|
|
591 | |
794 | |
592 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
795 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
593 | |
796 | |
|
|
797 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
|
|
798 | |
|
|
799 | delete pkt; |
|
|
800 | } |
|
|
801 | |
|
|
802 | void |
|
|
803 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
|
|
804 | { |
|
|
805 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
|
|
806 | |
|
|
807 | pkt->id = id; |
|
|
808 | |
|
|
809 | rsa_hash (id, chg, pkt->response); |
|
|
810 | |
|
|
811 | pkt->hmac_set (octx); |
|
|
812 | |
|
|
813 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
|
|
814 | |
594 | 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 |
595 | |
816 | |
596 | delete pkt; |
817 | delete pkt; |
597 | } |
818 | } |
598 | |
819 | |
599 | void |
820 | void |
600 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
|
|
601 | { |
|
|
602 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
|
|
603 | |
|
|
604 | pkt->id = id; |
|
|
605 | |
|
|
606 | rsa_hash (id, chg, pkt->response); |
|
|
607 | |
|
|
608 | pkt->hmac_set (octx); |
|
|
609 | |
|
|
610 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
|
|
611 | |
|
|
612 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
|
|
613 | |
|
|
614 | delete pkt; |
|
|
615 | } |
|
|
616 | |
|
|
617 | void |
|
|
618 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
619 | { |
822 | { |
620 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
823 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
621 | conf->id, rid, (const char *)rsi); |
824 | conf->id, rid, (const char *)rsi); |
622 | |
825 | |
623 | 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); |
624 | |
827 | |
625 | r->hmac_set (octx); |
828 | r->hmac_set (octx); |
626 | send_vpn_packet (r, si); |
829 | send_vpn_packet (r, si); |
627 | |
830 | |
628 | delete r; |
831 | delete r; |
629 | } |
832 | } |
630 | |
833 | |
631 | void |
834 | inline void |
632 | connection::establish_connection_cb (tstamp &ts) |
835 | connection::establish_connection_cb (ev::timer &w, int revents) |
633 | { |
836 | { |
634 | if (ictx || conf == THISNODE |
837 | if (!ictx |
|
|
838 | && conf != THISNODE |
635 | || connectmode == conf_node::C_NEVER |
839 | && connectmode != conf_node::C_NEVER |
636 | || connectmode == conf_node::C_DISABLED) |
840 | && connectmode != conf_node::C_DISABLED |
637 | ts = TSTAMP_CANCEL; |
841 | && !w.is_active ()) |
638 | else if (ts <= NOW) |
|
|
639 | { |
842 | { |
640 | 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 |
641 | |
844 | // and stop trying. should probably be handled by a per-connection expire handler. |
642 | if (retry_int < 3600 * 8) |
845 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
643 | retry_cnt++; |
|
|
644 | |
|
|
645 | ts = NOW + retry_int; |
|
|
646 | |
|
|
647 | if (conf->hostname) |
|
|
648 | { |
846 | { |
649 | reset_dstaddr (); |
847 | reset_connection (); |
650 | if (si.host && auth_rate_limiter.can (si)) |
848 | return; |
651 | { |
|
|
652 | if (retry_cnt < 4) |
|
|
653 | send_auth_request (si, true); |
|
|
654 | else |
|
|
655 | send_ping (si, 0); |
|
|
656 | } |
849 | } |
|
|
850 | |
|
|
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)); |
|
|
856 | |
|
|
857 | reset_si (); |
|
|
858 | |
|
|
859 | bool slow = si.prot & PROT_SLOW; |
|
|
860 | |
|
|
861 | if (si.prot && !si.host) |
|
|
862 | { |
|
|
863 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
864 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
865 | w.start (1); |
|
|
866 | vpn->send_connect_request (conf->id); |
657 | } |
867 | } |
658 | else |
868 | else |
659 | vpn->connect_request (conf->id); |
869 | { |
|
|
870 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
|
|
871 | |
|
|
872 | const sockinfo &dsi = forward_si (si); |
|
|
873 | |
|
|
874 | slow = slow || (dsi.prot & PROT_SLOW); |
|
|
875 | |
|
|
876 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
|
|
877 | { |
|
|
878 | if (retry_cnt < 4) |
|
|
879 | send_auth_request (dsi, true); |
|
|
880 | else |
|
|
881 | send_ping (dsi, 0); |
|
|
882 | } |
|
|
883 | } |
|
|
884 | |
|
|
885 | retry_int *= slow ? 8. : 0.9; |
|
|
886 | |
|
|
887 | if (retry_int < conf->max_retry) |
|
|
888 | retry_cnt++; |
|
|
889 | else |
|
|
890 | retry_int = conf->max_retry; |
|
|
891 | |
|
|
892 | w.start (retry_int); |
660 | } |
893 | } |
661 | } |
894 | } |
662 | |
895 | |
663 | void |
896 | void |
664 | connection::reset_connection () |
897 | connection::reset_connection () |
… | |
… | |
667 | { |
900 | { |
668 | slog (L_INFO, _("%s(%s): connection lost"), |
901 | slog (L_INFO, _("%s(%s): connection lost"), |
669 | conf->nodename, (const char *)si); |
902 | conf->nodename, (const char *)si); |
670 | |
903 | |
671 | if (::conf.script_node_down) |
904 | if (::conf.script_node_down) |
672 | run_script (run_script_cb (this, &connection::script_node_down), false); |
905 | { |
|
|
906 | run_script_cb *cb = new run_script_cb; |
|
|
907 | cb->set<connection, &connection::script_node_down> (this); |
|
|
908 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
909 | } |
673 | } |
910 | } |
674 | |
911 | |
675 | delete ictx; ictx = 0; |
912 | delete ictx; ictx = 0; |
676 | delete octx; octx = 0; |
913 | delete octx; octx = 0; |
|
|
914 | #if ENABLE_DNS |
|
|
915 | dnsv4_reset_connection (); |
|
|
916 | #endif |
677 | |
917 | |
678 | si.host= 0; |
918 | si.host = 0; |
679 | |
919 | |
680 | last_activity = 0; |
920 | last_activity = 0; |
681 | retry_cnt = 0; |
921 | retry_cnt = 0; |
682 | |
922 | |
683 | rekey.reset (); |
923 | rekey.stop (); |
684 | keepalive.reset (); |
924 | keepalive.stop (); |
685 | establish_connection.reset (); |
925 | establish_connection.stop (); |
686 | } |
926 | } |
687 | |
927 | |
688 | void |
928 | void |
689 | connection::shutdown () |
929 | connection::shutdown () |
690 | { |
930 | { |
… | |
… | |
692 | send_reset (si); |
932 | send_reset (si); |
693 | |
933 | |
694 | reset_connection (); |
934 | reset_connection (); |
695 | } |
935 | } |
696 | |
936 | |
697 | void |
937 | inline void |
698 | connection::rekey_cb (tstamp &ts) |
938 | connection::rekey_cb (ev::timer &w, int revents) |
699 | { |
939 | { |
700 | ts = TSTAMP_CANCEL; |
|
|
701 | |
|
|
702 | reset_connection (); |
940 | reset_connection (); |
703 | establish_connection (); |
941 | establish_connection (); |
704 | } |
942 | } |
705 | |
943 | |
706 | void |
944 | void |
707 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
945 | connection::send_data_packet (tap_packet *pkt) |
708 | { |
946 | { |
709 | vpndata_packet *p = new vpndata_packet; |
947 | vpndata_packet *p = new vpndata_packet; |
710 | int tos = 0; |
948 | int tos = 0; |
711 | |
949 | |
712 | if (conf->inherit_tos |
950 | // I am not hilarious about peeking into packets, but so be it. |
713 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
951 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
714 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
715 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
952 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
716 | |
953 | |
717 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
954 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
718 | send_vpn_packet (p, si, tos); |
955 | send_vpn_packet (p, si, tos); |
719 | |
956 | |
720 | delete p; |
957 | delete p; |
721 | |
958 | |
722 | if (oseqno > MAX_SEQNO) |
959 | if (oseqno > MAX_SEQNO) |
723 | rekey (); |
960 | rekey (); |
724 | } |
961 | } |
725 | |
962 | |
726 | void |
963 | void |
|
|
964 | connection::post_inject_queue () |
|
|
965 | { |
|
|
966 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
967 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
968 | establish_connection.stop (); |
|
|
969 | |
|
|
970 | establish_connection (); |
|
|
971 | } |
|
|
972 | |
|
|
973 | void |
727 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
974 | connection::inject_data_packet (tap_packet *pkt) |
728 | { |
975 | { |
729 | if (ictx && octx) |
976 | if (ictx && octx) |
730 | send_data_packet (pkt, broadcast); |
977 | send_data_packet (pkt); |
731 | else |
978 | else |
732 | { |
979 | { |
733 | if (!broadcast)//DDDD |
|
|
734 | queue.put (new tap_packet (*pkt)); |
980 | data_queue.put (new tap_packet (*pkt)); |
|
|
981 | post_inject_queue (); |
|
|
982 | } |
|
|
983 | } |
735 | |
984 | |
736 | establish_connection (); |
985 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
|
|
986 | { |
|
|
987 | if (ictx && octx) |
|
|
988 | send_vpn_packet (pkt, si, tos); |
|
|
989 | else |
|
|
990 | { |
|
|
991 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
|
|
992 | post_inject_queue (); |
737 | } |
993 | } |
738 | } |
994 | } |
739 | |
995 | |
740 | void |
996 | void |
741 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
997 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
742 | { |
998 | { |
743 | last_activity = NOW; |
999 | last_activity = ev_now (); |
744 | |
1000 | |
745 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1001 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
746 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1002 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
747 | |
1003 | |
|
|
1004 | if (connectmode == conf_node::C_DISABLED) |
|
|
1005 | return; |
|
|
1006 | |
748 | switch (pkt->typ ()) |
1007 | switch (pkt->typ ()) |
749 | { |
1008 | { |
750 | case vpn_packet::PT_PING: |
1009 | case vpn_packet::PT_PING: |
751 | // we send pings instead of auth packets after some retries, |
1010 | // we send pings instead of auth packets after some retries, |
752 | // so reset the retry counter and establish a connection |
1011 | // so reset the retry counter and establish a connection |
753 | // when we receive a ping. |
1012 | // when we receive a ping. |
754 | if (!ictx) |
1013 | if (!ictx) |
|
|
1014 | { |
|
|
1015 | if (auth_rate_limiter.can (rsi)) |
|
|
1016 | send_auth_request (rsi, true); |
|
|
1017 | } |
|
|
1018 | else |
|
|
1019 | send_ping (rsi, 1); // pong |
|
|
1020 | |
|
|
1021 | break; |
|
|
1022 | |
|
|
1023 | case vpn_packet::PT_PONG: |
|
|
1024 | break; |
|
|
1025 | |
|
|
1026 | case vpn_packet::PT_RESET: |
755 | { |
1027 | { |
756 | if (auth_rate_limiter.can (rsi)) |
1028 | reset_connection (); |
757 | send_auth_request (rsi, true); |
1029 | |
|
|
1030 | config_packet *p = (config_packet *) pkt; |
|
|
1031 | |
|
|
1032 | if (!p->chk_config ()) |
|
|
1033 | { |
|
|
1034 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
|
|
1035 | conf->nodename, (const char *)rsi); |
|
|
1036 | connectmode = conf_node::C_DISABLED; |
|
|
1037 | } |
|
|
1038 | else if (connectmode == conf_node::C_ALWAYS) |
|
|
1039 | establish_connection (); |
758 | } |
1040 | } |
759 | else |
|
|
760 | send_ping (rsi, 1); // pong |
|
|
761 | |
|
|
762 | break; |
1041 | break; |
763 | |
1042 | |
764 | case vpn_packet::PT_PONG: |
|
|
765 | break; |
|
|
766 | |
|
|
767 | case vpn_packet::PT_RESET: |
1043 | case vpn_packet::PT_AUTH_REQ: |
768 | { |
1044 | if (auth_rate_limiter.can (rsi)) |
769 | reset_connection (); |
|
|
770 | |
|
|
771 | config_packet *p = (config_packet *) pkt; |
|
|
772 | |
|
|
773 | if (!p->chk_config ()) |
|
|
774 | { |
1045 | { |
|
|
1046 | auth_req_packet *p = (auth_req_packet *) pkt; |
|
|
1047 | |
|
|
1048 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
|
|
1049 | |
|
|
1050 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
|
|
1051 | { |
|
|
1052 | if (p->prot_minor != PROTOCOL_MINOR) |
|
|
1053 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
1054 | conf->nodename, (const char *)rsi, |
|
|
1055 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
1056 | |
|
|
1057 | if (p->initiate) |
|
|
1058 | send_auth_request (rsi, false); |
|
|
1059 | |
|
|
1060 | rsachallenge k; |
|
|
1061 | |
|
|
1062 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
|
|
1063 | { |
|
|
1064 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
|
|
1065 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
1066 | break; |
|
|
1067 | } |
|
|
1068 | else |
|
|
1069 | { |
|
|
1070 | delete octx; |
|
|
1071 | |
|
|
1072 | octx = new crypto_ctx (k, 1); |
|
|
1073 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
|
|
1074 | |
|
|
1075 | conf->protocols = p->protocols; |
|
|
1076 | features = p->features & config_packet::get_features (); |
|
|
1077 | |
|
|
1078 | send_auth_response (rsi, p->id, k); |
|
|
1079 | |
|
|
1080 | connection_established (); |
|
|
1081 | |
|
|
1082 | break; |
|
|
1083 | } |
|
|
1084 | } |
|
|
1085 | else |
775 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1086 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
776 | conf->nodename, (const char *)rsi); |
1087 | conf->nodename, (const char *)rsi); |
777 | connectmode = conf_node::C_DISABLED; |
1088 | |
|
|
1089 | send_reset (rsi); |
778 | } |
1090 | } |
779 | else if (connectmode == conf_node::C_ALWAYS) |
1091 | |
780 | establish_connection (); |
|
|
781 | } |
|
|
782 | break; |
1092 | break; |
783 | |
1093 | |
784 | case vpn_packet::PT_AUTH_REQ: |
1094 | case vpn_packet::PT_AUTH_RES: |
785 | if (auth_rate_limiter.can (rsi)) |
|
|
786 | { |
1095 | { |
787 | auth_req_packet *p = (auth_req_packet *) pkt; |
1096 | auth_res_packet *p = (auth_res_packet *) pkt; |
788 | |
1097 | |
789 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1098 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
790 | |
1099 | |
791 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1100 | if (p->chk_config ()) |
792 | { |
1101 | { |
793 | if (p->prot_minor != PROTOCOL_MINOR) |
1102 | if (p->prot_minor != PROTOCOL_MINOR) |
794 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1103 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
795 | conf->nodename, (const char *)rsi, |
1104 | conf->nodename, (const char *)rsi, |
796 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1105 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
797 | |
1106 | |
798 | if (p->initiate) |
|
|
799 | send_auth_request (rsi, false); |
|
|
800 | |
|
|
801 | rsachallenge k; |
1107 | rsachallenge chg; |
802 | |
1108 | |
803 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
1109 | if (!rsa_cache.find (p->id, chg)) |
804 | (unsigned char *)&p->encr, (unsigned char *)&k, |
1110 | { |
805 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
1111 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
806 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
|
|
807 | conf->nodename, (const char *)rsi); |
1112 | conf->nodename, (const char *)rsi); |
|
|
1113 | break; |
|
|
1114 | } |
808 | else |
1115 | else |
809 | { |
1116 | { |
810 | retry_cnt = 0; |
1117 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
811 | establish_connection.set (NOW + 8); //? ;) |
1118 | |
812 | keepalive.reset (); |
1119 | if (!p->hmac_chk (cctx)) |
|
|
1120 | { |
|
|
1121 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
1122 | "could be an attack, or just corruption or a synchronization error"), |
|
|
1123 | conf->nodename, (const char *)rsi); |
|
|
1124 | break; |
|
|
1125 | } |
813 | rekey.reset (); |
1126 | else |
|
|
1127 | { |
|
|
1128 | rsaresponse h; |
814 | |
1129 | |
|
|
1130 | rsa_hash (p->id, chg, h); |
|
|
1131 | |
|
|
1132 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
1133 | { |
|
|
1134 | prot_minor = p->prot_minor; |
|
|
1135 | |
|
|
1136 | delete ictx; ictx = cctx; |
|
|
1137 | |
|
|
1138 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
1139 | |
|
|
1140 | si = rsi; |
|
|
1141 | protocol = rsi.prot; |
|
|
1142 | |
|
|
1143 | connection_established (); |
|
|
1144 | |
|
|
1145 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1146 | conf->nodename, (const char *)rsi, |
|
|
1147 | p->prot_major, p->prot_minor); |
|
|
1148 | |
|
|
1149 | if (::conf.script_node_up) |
|
|
1150 | { |
|
|
1151 | run_script_cb *cb = new run_script_cb; |
|
|
1152 | cb->set<connection, &connection::script_node_up> (this); |
|
|
1153 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
1154 | } |
|
|
1155 | |
|
|
1156 | break; |
|
|
1157 | } |
|
|
1158 | else |
|
|
1159 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
1160 | conf->nodename, (const char *)rsi); |
|
|
1161 | } |
|
|
1162 | |
815 | delete ictx; |
1163 | delete cctx; |
816 | ictx = 0; |
|
|
817 | |
|
|
818 | delete octx; |
|
|
819 | |
|
|
820 | octx = new crypto_ctx (k, 1); |
|
|
821 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
|
|
822 | |
|
|
823 | conf->protocols = p->protocols; |
|
|
824 | send_auth_response (rsi, p->id, k); |
|
|
825 | |
|
|
826 | break; |
|
|
827 | } |
1164 | } |
828 | } |
1165 | } |
829 | |
|
|
830 | send_reset (rsi); |
|
|
831 | } |
1166 | } |
832 | |
1167 | |
|
|
1168 | send_reset (rsi); |
833 | break; |
1169 | break; |
834 | |
1170 | |
835 | case vpn_packet::PT_AUTH_RES: |
1171 | case vpn_packet::PT_DATA_COMPRESSED: |
836 | { |
1172 | #if !ENABLE_COMPRESSION |
837 | auth_res_packet *p = (auth_res_packet *) pkt; |
1173 | send_reset (rsi); |
|
|
1174 | break; |
|
|
1175 | #endif |
838 | |
1176 | |
839 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1177 | case vpn_packet::PT_DATA_UNCOMPRESSED: |
840 | |
1178 | |
841 | if (p->chk_config ()) |
1179 | if (ictx && octx) |
842 | { |
1180 | { |
843 | if (p->prot_minor != PROTOCOL_MINOR) |
1181 | vpndata_packet *p = (vpndata_packet *)pkt; |
844 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
845 | conf->nodename, (const char *)rsi, |
|
|
846 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
847 | |
1182 | |
848 | rsachallenge chg; |
1183 | if (!p->hmac_chk (ictx)) |
849 | |
1184 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
850 | if (!rsa_cache.find (p->id, chg)) |
1185 | "could be an attack, or just corruption or a synchronization error"), |
851 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
|
|
852 | conf->nodename, (const char *)rsi); |
1186 | conf->nodename, (const char *)rsi); |
853 | else |
1187 | else |
854 | { |
1188 | { |
855 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
|
|
856 | |
|
|
857 | if (!p->hmac_chk (cctx)) |
|
|
858 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
859 | "could be an attack, or just corruption or an synchronization error"), |
|
|
860 | conf->nodename, (const char *)rsi); |
|
|
861 | else |
1189 | u32 seqno; |
|
|
1190 | tap_packet *d = p->unpack (this, seqno); |
|
|
1191 | |
|
|
1192 | if (iseqno.recv_ok (seqno)) |
862 | { |
1193 | { |
863 | rsaresponse h; |
1194 | vpn->tap->send (d); |
864 | |
1195 | |
865 | rsa_hash (p->id, chg, h); |
1196 | if (si != rsi) |
866 | |
|
|
867 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
868 | { |
1197 | { |
869 | prot_minor = p->prot_minor; |
1198 | // fast re-sync on source address changes, useful especially for tcp/ip |
870 | |
|
|
871 | delete ictx; ictx = cctx; |
|
|
872 | |
|
|
873 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
874 | |
|
|
875 | si = rsi; |
1199 | si = rsi; |
876 | |
1200 | |
877 | rekey.set (NOW + ::conf.rekey); |
1201 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
878 | keepalive.set (NOW + ::conf.keepalive); |
|
|
879 | |
|
|
880 | // send queued packets |
|
|
881 | while (tap_packet *p = queue.get ()) |
|
|
882 | { |
|
|
883 | send_data_packet (p); |
|
|
884 | delete p; |
|
|
885 | } |
|
|
886 | |
|
|
887 | connectmode = conf->connectmode; |
|
|
888 | |
|
|
889 | slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"), |
|
|
890 | conf->nodename, (const char *)rsi, |
1202 | conf->nodename, (const char *)si, (const char *)rsi); |
891 | strprotocol (protocol), |
|
|
892 | p->prot_major, p->prot_minor); |
|
|
893 | |
|
|
894 | if (::conf.script_node_up) |
|
|
895 | run_script (run_script_cb (this, &connection::script_node_up), false); |
|
|
896 | |
|
|
897 | break; |
|
|
898 | } |
1203 | } |
899 | else |
|
|
900 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
901 | conf->nodename, (const char *)rsi); |
|
|
902 | } |
1204 | } |
903 | |
1205 | |
904 | delete cctx; |
1206 | delete d; |
|
|
1207 | break; |
905 | } |
1208 | } |
906 | } |
1209 | } |
907 | } |
|
|
908 | |
1210 | |
909 | send_reset (rsi); |
1211 | send_reset (rsi); |
910 | break; |
1212 | break; |
911 | |
1213 | |
912 | case vpn_packet::PT_DATA_COMPRESSED: |
|
|
913 | #if !ENABLE_COMPRESSION |
|
|
914 | send_reset (rsi); |
|
|
915 | break; |
|
|
916 | #endif |
|
|
917 | |
|
|
918 | case vpn_packet::PT_DATA_UNCOMPRESSED: |
|
|
919 | |
|
|
920 | if (ictx && octx) |
|
|
921 | { |
|
|
922 | vpndata_packet *p = (vpndata_packet *)pkt; |
|
|
923 | |
|
|
924 | if (rsi == si) |
|
|
925 | { |
|
|
926 | if (!p->hmac_chk (ictx)) |
|
|
927 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
928 | "could be an attack, or just corruption or an synchronization error"), |
|
|
929 | conf->nodename, (const char *)rsi); |
|
|
930 | else |
|
|
931 | { |
|
|
932 | u32 seqno; |
|
|
933 | tap_packet *d = p->unpack (this, seqno); |
|
|
934 | |
|
|
935 | if (iseqno.recv_ok (seqno)) |
|
|
936 | { |
|
|
937 | vpn->tap->send (d); |
|
|
938 | |
|
|
939 | if (p->dst () == 0) // re-broadcast |
|
|
940 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
941 | { |
|
|
942 | connection *c = *i; |
|
|
943 | |
|
|
944 | if (c->conf != THISNODE && c->conf != conf) |
|
|
945 | c->inject_data_packet (d); |
|
|
946 | } |
|
|
947 | |
|
|
948 | delete d; |
|
|
949 | |
|
|
950 | break; |
|
|
951 | } |
|
|
952 | } |
|
|
953 | } |
|
|
954 | else |
|
|
955 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi); |
|
|
956 | } |
|
|
957 | |
|
|
958 | send_reset (rsi); |
|
|
959 | break; |
|
|
960 | |
|
|
961 | case vpn_packet::PT_CONNECT_REQ: |
1214 | case vpn_packet::PT_CONNECT_REQ: |
962 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1215 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
963 | { |
1216 | { |
964 | connect_req_packet *p = (connect_req_packet *) pkt; |
1217 | connect_req_packet *p = (connect_req_packet *) pkt; |
965 | |
1218 | |
966 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1219 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
967 | conf->protocols = p->protocols; |
1220 | { |
968 | connection *c = vpn->conns[p->id - 1]; |
1221 | connection *c = vpn->conns[p->id - 1]; |
|
|
1222 | conf->protocols = p->protocols; |
969 | |
1223 | |
970 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1224 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
971 | conf->id, p->id, c->ictx && c->octx); |
1225 | conf->id, p->id, c->ictx && c->octx); |
972 | |
1226 | |
973 | if (c->ictx && c->octx) |
1227 | if (c->ictx && c->octx) |
974 | { |
1228 | { |
975 | // send connect_info packets to both sides, in case one is |
1229 | // send connect_info packets to both sides, in case one is |
976 | // behind a nat firewall (or both ;) |
1230 | // behind a nat firewall (or both ;) |
977 | c->send_connect_info (conf->id, si, conf->protocols); |
1231 | c->send_connect_info (conf->id, si, conf->protocols); |
978 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1232 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1233 | } |
|
|
1234 | else |
|
|
1235 | c->establish_connection (); |
979 | } |
1236 | } |
|
|
1237 | else |
|
|
1238 | slog (L_WARN, |
|
|
1239 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1240 | p->id); |
980 | } |
1241 | } |
981 | |
1242 | |
982 | break; |
1243 | break; |
983 | |
1244 | |
984 | case vpn_packet::PT_CONNECT_INFO: |
1245 | case vpn_packet::PT_CONNECT_INFO: |
985 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1246 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
986 | { |
1247 | { |
987 | connect_info_packet *p = (connect_info_packet *) pkt; |
1248 | connect_info_packet *p = (connect_info_packet *)pkt; |
988 | |
1249 | |
989 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1250 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
990 | conf->protocols = p->protocols; |
1251 | { |
991 | connection *c = vpn->conns[p->id - 1]; |
1252 | connection *c = vpn->conns[p->id - 1]; |
992 | |
1253 | |
|
|
1254 | c->conf->protocols = p->protocols; |
|
|
1255 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
|
|
1256 | p->si.upgrade_protocol (protocol, c->conf); |
|
|
1257 | |
993 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1258 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
994 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1259 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
995 | |
1260 | |
|
|
1261 | const sockinfo &dsi = forward_si (p->si); |
|
|
1262 | |
|
|
1263 | if (dsi.valid ()) |
996 | c->send_auth_request (p->si, true); |
1264 | c->send_auth_request (dsi, true); |
|
|
1265 | } |
|
|
1266 | else |
|
|
1267 | slog (L_WARN, |
|
|
1268 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1269 | p->id); |
997 | } |
1270 | } |
998 | |
1271 | |
999 | break; |
1272 | break; |
1000 | |
1273 | |
1001 | default: |
1274 | default: |
1002 | send_reset (rsi); |
1275 | send_reset (rsi); |
1003 | break; |
1276 | break; |
1004 | |
|
|
1005 | } |
1277 | } |
1006 | } |
1278 | } |
1007 | |
1279 | |
1008 | void connection::keepalive_cb (tstamp &ts) |
1280 | inline void |
|
|
1281 | connection::keepalive_cb (ev::timer &w, int revents) |
1009 | { |
1282 | { |
1010 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1283 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1011 | { |
1284 | { |
1012 | reset_connection (); |
1285 | reset_connection (); |
1013 | establish_connection (); |
1286 | establish_connection (); |
1014 | } |
1287 | } |
1015 | else if (NOW < last_activity + ::conf.keepalive) |
1288 | else if (ev_now () < last_activity + ::conf.keepalive) |
1016 | ts = last_activity + ::conf.keepalive; |
1289 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1017 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1290 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1018 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1291 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1019 | { |
1292 | { |
1020 | send_ping (si); |
1293 | send_ping (si); |
1021 | ts = NOW + 5; |
1294 | w.start (5); |
1022 | } |
1295 | } |
|
|
1296 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
|
|
1297 | // hold ondemand connections implicitly a few seconds longer |
|
|
1298 | // should delete octx, though, or something like that ;) |
|
|
1299 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1023 | else |
1300 | else |
1024 | reset_connection (); |
1301 | reset_connection (); |
1025 | } |
1302 | } |
1026 | |
1303 | |
1027 | void connection::connect_request (int id) |
1304 | void connection::send_connect_request (int id) |
1028 | { |
1305 | { |
1029 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1306 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1030 | |
1307 | |
1031 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1308 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1032 | p->hmac_set (octx); |
1309 | p->hmac_set (octx); |
1033 | send_vpn_packet (p, si); |
1310 | send_vpn_packet (p, si); |
1034 | |
1311 | |
1035 | delete p; |
1312 | delete p; |
1036 | } |
1313 | } |
1037 | |
1314 | |
|
|
1315 | void connection::script_init_env (const char *ext) |
|
|
1316 | { |
|
|
1317 | char *env; |
|
|
1318 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1319 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1320 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1321 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1322 | conf->id & 0xff); putenv (env); |
|
|
1323 | } |
|
|
1324 | |
1038 | void connection::script_node () |
1325 | void connection::script_init_connect_env () |
1039 | { |
1326 | { |
1040 | vpn->script_if_up (0); |
1327 | vpn->script_init_env (); |
1041 | |
1328 | |
1042 | char *env; |
1329 | char *env; |
1043 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1330 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1044 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1331 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1045 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1332 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1046 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1333 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1047 | } |
1334 | } |
1048 | |
1335 | |
|
|
1336 | inline const char * |
1049 | const char *connection::script_node_up (int) |
1337 | connection::script_node_up () |
1050 | { |
1338 | { |
1051 | script_node (); |
1339 | script_init_connect_env (); |
1052 | |
1340 | |
1053 | putenv ("STATE=up"); |
1341 | putenv ((char *)"STATE=up"); |
1054 | |
1342 | |
|
|
1343 | char *filename; |
|
|
1344 | asprintf (&filename, |
|
|
1345 | "%s/%s", |
|
|
1346 | confbase, |
1055 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1347 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1056 | } |
|
|
1057 | |
1348 | |
|
|
1349 | return filename; |
|
|
1350 | } |
|
|
1351 | |
|
|
1352 | inline const char * |
1058 | const char *connection::script_node_down (int) |
1353 | connection::script_node_down () |
1059 | { |
1354 | { |
1060 | script_node (); |
1355 | script_init_connect_env (); |
1061 | |
1356 | |
1062 | putenv ("STATE=down"); |
1357 | putenv ((char *)"STATE=down"); |
1063 | |
1358 | |
1064 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1359 | char *filename; |
1065 | } |
1360 | asprintf (&filename, |
|
|
1361 | "%s/%s", |
|
|
1362 | confbase, |
|
|
1363 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1066 | |
1364 | |
1067 | // send a vpn packet out to other hosts |
1365 | return filename; |
1068 | void |
|
|
1069 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
1070 | { |
|
|
1071 | if (protocol & PROT_IPv4) |
|
|
1072 | vpn->send_ipv4_packet (pkt, si, tos); |
|
|
1073 | else |
|
|
1074 | vpn->send_udpv4_packet (pkt, si, tos); |
|
|
1075 | } |
1366 | } |
1076 | |
1367 | |
1077 | connection::connection(struct vpn *vpn_) |
1368 | connection::connection (struct vpn *vpn, conf_node *conf) |
1078 | : vpn(vpn_) |
1369 | : vpn(vpn), conf(conf), |
1079 | , rekey (this, &connection::rekey_cb) |
1370 | #if ENABLE_DNS |
1080 | , keepalive (this, &connection::keepalive_cb) |
1371 | dns (0), |
|
|
1372 | #endif |
|
|
1373 | data_queue(conf->max_ttl, conf->max_queue), |
|
|
1374 | vpn_queue(conf->max_ttl, conf->max_queue) |
|
|
1375 | { |
|
|
1376 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1377 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1081 | , establish_connection (this, &connection::establish_connection_cb) |
1378 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1082 | { |
1379 | |
|
|
1380 | last_establish_attempt = 0.; |
1083 | octx = ictx = 0; |
1381 | octx = ictx = 0; |
1084 | retry_cnt = 0; |
|
|
1085 | |
1382 | |
1086 | connectmode = conf_node::C_ALWAYS; // initial setting |
1383 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1384 | conf->protocols = PROT_UDPv4; |
|
|
1385 | |
|
|
1386 | connectmode = conf->connectmode; |
|
|
1387 | |
|
|
1388 | // queue a dummy packet to force an initial connection attempt |
|
|
1389 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1390 | vpn_queue.put (new net_packet); |
|
|
1391 | |
1087 | reset_connection (); |
1392 | reset_connection (); |
1088 | } |
1393 | } |
1089 | |
1394 | |
1090 | connection::~connection () |
1395 | connection::~connection () |
1091 | { |
1396 | { |