1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify it |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | under the terms of the GNU General Public License as published by the |
8 | under the terms of the GNU General Public License as published by the |
… | |
… | |
33 | |
33 | |
34 | #include <list> |
34 | #include <list> |
35 | #include <queue> |
35 | #include <queue> |
36 | #include <utility> |
36 | #include <utility> |
37 | |
37 | |
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38 | #include <openssl/opensslv.h> |
38 | #include <openssl/rand.h> |
39 | #include <openssl/rand.h> |
39 | #include <openssl/evp.h> |
40 | #include <openssl/evp.h> |
40 | #include <openssl/rsa.h> |
41 | #include <openssl/rsa.h> |
41 | #include <openssl/err.h> |
42 | #include <openssl/err.h> |
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43 | |
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44 | // openssl 0.9.8 compatibility |
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45 | #if OPENSSL_VERSION_NUMBER < 0x10100000 |
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46 | #define require101(exp) exp |
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47 | #else |
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48 | #define require101(exp) equire (exp) |
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49 | #endif |
42 | |
50 | |
43 | #include "conf.h" |
51 | #include "conf.h" |
44 | #include "slog.h" |
52 | #include "slog.h" |
45 | #include "device.h" |
53 | #include "device.h" |
46 | #include "vpn.h" |
54 | #include "vpn.h" |
47 | #include "connection.h" |
55 | #include "connection.h" |
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56 | #include "hkdf.h" |
48 | |
57 | |
49 | #include "netcompat.h" |
58 | #include "netcompat.h" |
50 | |
59 | |
51 | #if !HAVE_RAND_PSEUDO_BYTES |
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52 | # define RAND_pseudo_bytes RAND_bytes |
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53 | #endif |
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54 | |
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55 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
60 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic |
56 | |
61 | |
57 | #define ULTRA_FAST 1 |
62 | #define ULTRA_FAST 1 |
58 | #define HLOG 15 |
63 | #define HLOG 15 |
59 | #include "lzf/lzf.h" |
64 | #include "lzf/lzf.h" |
60 | #include "lzf/lzf_c.c" |
65 | #include "lzf/lzf_c.c" |
… | |
… | |
63 | ////////////////////////////////////////////////////////////////////////////// |
68 | ////////////////////////////////////////////////////////////////////////////// |
64 | |
69 | |
65 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
70 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
66 | static ev::child rs_child_ev; |
71 | static ev::child rs_child_ev; |
67 | |
72 | |
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73 | namespace |
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74 | { |
68 | void // c++ requires external linkage here, apparently :( |
75 | void // c++ requires external linkage here, apparently :( |
69 | rs_child_cb (ev::child &w, int revents) |
76 | rs_child_cb (ev::child &w, int revents) |
70 | { |
77 | { |
71 | w.stop (); |
78 | w.stop (); |
72 | |
79 | |
73 | if (rs_queue.empty ()) |
80 | if (rs_queue.empty ()) |
74 | return; |
81 | return; |
75 | |
82 | |
76 | pid_t pid = run_script (*rs_queue.front ().first, false); |
83 | pid_t pid = run_script (*rs_queue.front ().first, false); |
77 | if (pid) |
84 | if (pid) |
78 | { |
85 | { |
79 | w.set (pid); |
86 | w.set (pid); |
80 | w.start (); |
87 | w.start (); |
81 | } |
88 | } |
82 | else |
89 | else |
83 | slog (L_WARN, rs_queue.front ().second); |
90 | slog (L_WARN, rs_queue.front ().second); |
84 | |
91 | |
85 | delete rs_queue.front ().first; |
92 | delete rs_queue.front ().first; |
86 | rs_queue.pop (); |
93 | rs_queue.pop (); |
87 | } |
94 | } |
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95 | }; |
88 | |
96 | |
89 | // despite the fancy name, this is quite a hack |
97 | // despite the fancy name, this is quite a hack |
90 | static void |
98 | static void |
91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
99 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
92 | { |
100 | { |
… | |
… | |
104 | struct crypto_ctx |
112 | struct crypto_ctx |
105 | { |
113 | { |
106 | EVP_CIPHER_CTX cctx; |
114 | EVP_CIPHER_CTX cctx; |
107 | HMAC_CTX hctx; |
115 | HMAC_CTX hctx; |
108 | |
116 | |
109 | crypto_ctx (const rsachallenge &challenge, int enc); |
117 | crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc); |
110 | ~crypto_ctx (); |
118 | ~crypto_ctx (); |
111 | }; |
119 | }; |
112 | |
120 | |
113 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
121 | crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc) |
114 | { |
122 | { |
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123 | ecdh_key s; |
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124 | |
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125 | curve25519_combine (a, b, s); |
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126 | |
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127 | { |
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128 | u8 mac_key[MAC_KEYSIZE]; |
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129 | static const unsigned char mac_info[] = "gvpe mac key"; |
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130 | |
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131 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
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132 | kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key)); |
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133 | kdf.extract (s, sizeof (s)); |
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134 | kdf.extract_done (HKDF_PRF_HASH ()); |
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135 | kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info)); |
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136 | |
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137 | HMAC_CTX_init (&hctx); |
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138 | require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0)); |
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139 | } |
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140 | |
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141 | { |
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142 | u8 cipher_key[CIPHER_KEYSIZE]; |
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143 | static const unsigned char cipher_info[] = "gvpe cipher key"; |
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144 | |
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145 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
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146 | kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key)); |
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147 | kdf.extract (s, sizeof (s)); |
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148 | kdf.extract_done (HKDF_PRF_HASH ()); |
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149 | kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info)); |
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150 | |
115 | EVP_CIPHER_CTX_init (&cctx); |
151 | EVP_CIPHER_CTX_init (&cctx); |
116 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
152 | require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc)); |
117 | HMAC_CTX_init (&hctx); |
153 | } |
118 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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119 | } |
154 | } |
120 | |
155 | |
121 | crypto_ctx::~crypto_ctx () |
156 | crypto_ctx::~crypto_ctx () |
122 | { |
157 | { |
123 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
158 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
124 | HMAC_CTX_cleanup (&hctx); |
159 | HMAC_CTX_cleanup (&hctx); |
125 | } |
160 | } |
126 | |
161 | |
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162 | static inline void |
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163 | auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr) |
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164 | { |
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165 | if (RSA_public_encrypt (sizeof (auth.rsa), |
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166 | (unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa, |
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167 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
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168 | fatal ("RSA_public_encrypt error"); |
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169 | |
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170 | memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh)); |
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171 | } |
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172 | |
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173 | static inline bool |
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174 | auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth) |
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175 | { |
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176 | u8 rsa_decrypt[RSA_KEYLEN]; |
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177 | |
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178 | if (RSA_private_decrypt (sizeof (encr.rsa), |
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179 | (const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt, |
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180 | key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa)) |
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181 | return 0; |
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182 | |
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183 | memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa)); |
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184 | memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh)); |
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185 | |
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186 | return 1; |
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187 | } |
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188 | |
127 | static void |
189 | static void |
128 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
190 | auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac) |
129 | { |
191 | { |
130 | EVP_MD_CTX ctx; |
192 | hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt |
131 | |
193 | kdf.extract (&auth.rsa, sizeof (auth.rsa)); |
132 | EVP_MD_CTX_init (&ctx); |
194 | kdf.extract_done (); |
133 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
195 | kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info |
134 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
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135 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
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136 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
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137 | EVP_MD_CTX_cleanup (&ctx); |
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138 | } |
196 | } |
139 | |
197 | |
140 | struct rsa_entry |
198 | void |
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199 | connection::generate_auth_data () |
141 | { |
200 | { |
142 | tstamp expire; |
201 | if (auth_expire < ev_now ()) |
143 | rsaid id; |
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144 | rsachallenge chg; |
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145 | }; |
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146 | |
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147 | struct rsa_cache : list<rsa_entry> |
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148 | { |
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149 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
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150 | |
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151 | bool find (const rsaid &id, rsachallenge &chg) |
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152 | { |
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153 | for (iterator i = begin (); i != end (); ++i) |
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154 | { |
202 | { |
155 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
203 | // request data |
156 | { |
204 | rand_fill (snd_auth.rsa); |
157 | memcpy (&chg, &i->chg, sizeof chg); |
205 | curve25519_generate (snd_ecdh_a, snd_auth.ecdh); |
158 | |
206 | |
159 | erase (i); |
207 | // eventual response data |
160 | return true; |
208 | curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); |
161 | } |
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162 | } |
209 | } |
163 | |
210 | |
164 | if (!cleaner.is_active ()) |
211 | // every use prolongs the expiry |
165 | cleaner.again (); |
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166 | |
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167 | return false; |
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168 | } |
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169 | |
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170 | void gen (rsaid &id, rsachallenge &chg) |
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171 | { |
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172 | rsa_entry e; |
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173 | |
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174 | RAND_bytes ((unsigned char *)&id, sizeof id); |
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175 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
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176 | |
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177 | e.expire = ev_now () + RSA_TTL; |
212 | auth_expire = ev_now () + AUTH_TTL; |
178 | e.id = id; |
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179 | memcpy (&e.chg, &chg, sizeof chg); |
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180 | |
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181 | push_back (e); |
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182 | |
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183 | if (!cleaner.is_active ()) |
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184 | cleaner.again (); |
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185 | } |
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186 | |
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187 | rsa_cache () |
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188 | { |
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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 | } |
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192 | |
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193 | } rsa_cache; |
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194 | |
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195 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
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196 | { |
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197 | if (empty ()) |
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198 | w.stop (); |
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199 | else |
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200 | { |
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201 | for (iterator i = begin (); i != end (); ) |
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202 | if (i->expire <= ev_now ()) |
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203 | i = erase (i); |
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204 | else |
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205 | ++i; |
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206 | } |
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207 | } |
213 | } |
208 | |
214 | |
209 | ////////////////////////////////////////////////////////////////////////////// |
215 | ////////////////////////////////////////////////////////////////////////////// |
210 | |
216 | |
211 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
217 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
… | |
… | |
225 | delete p; |
231 | delete p; |
226 | |
232 | |
227 | delete [] queue; |
233 | delete [] queue; |
228 | } |
234 | } |
229 | |
235 | |
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236 | void |
230 | void pkt_queue::expire_cb (ev::timer &w, int revents) |
237 | pkt_queue::expire_cb (ev::timer &w, int revents) |
231 | { |
238 | { |
232 | ev_tstamp expire = ev_now () - max_ttl; |
239 | ev_tstamp expire = ev_now () - max_ttl; |
233 | |
240 | |
234 | for (;;) |
241 | for (;;) |
235 | { |
242 | { |
… | |
… | |
246 | |
253 | |
247 | delete get (); |
254 | delete get (); |
248 | } |
255 | } |
249 | } |
256 | } |
250 | |
257 | |
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258 | void |
251 | void pkt_queue::put (net_packet *p) |
259 | pkt_queue::put (net_packet *p) |
252 | { |
260 | { |
253 | ev_tstamp now = ev_now (); |
261 | ev_tstamp now = ev_now (); |
254 | |
262 | |
255 | // start expiry timer |
263 | // start expiry timer |
256 | if (empty ()) |
264 | if (empty ()) |
… | |
… | |
265 | queue[i].tstamp = now; |
273 | queue[i].tstamp = now; |
266 | |
274 | |
267 | i = ni; |
275 | i = ni; |
268 | } |
276 | } |
269 | |
277 | |
270 | net_packet *pkt_queue::get () |
278 | net_packet * |
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279 | pkt_queue::get () |
271 | { |
280 | { |
272 | if (empty ()) |
281 | if (empty ()) |
273 | return 0; |
282 | return 0; |
274 | |
283 | |
275 | net_packet *p = queue[j].pkt; |
284 | net_packet *p = queue[j].pkt; |
… | |
… | |
299 | |
308 | |
300 | bool can (const sockinfo &si) { return can((u32)si.host); } |
309 | bool can (const sockinfo &si) { return can((u32)si.host); } |
301 | bool can (u32 host); |
310 | bool can (u32 host); |
302 | }; |
311 | }; |
303 | |
312 | |
304 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
313 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
305 | |
314 | |
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315 | bool |
306 | bool net_rate_limiter::can (u32 host) |
316 | net_rate_limiter::can (u32 host) |
307 | { |
317 | { |
308 | iterator i; |
318 | iterator i; |
309 | |
319 | |
310 | for (i = begin (); i != end (); ) |
320 | for (i = begin (); i != end (); ) |
311 | if (i->host == host) |
321 | if (i->host == host) |
… | |
… | |
356 | } |
366 | } |
357 | } |
367 | } |
358 | |
368 | |
359 | ///////////////////////////////////////////////////////////////////////////// |
369 | ///////////////////////////////////////////////////////////////////////////// |
360 | |
370 | |
361 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
371 | void |
362 | |
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363 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
372 | hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest) |
364 | { |
373 | { |
365 | unsigned int xlen; |
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366 | |
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367 | HMAC_CTX *hctx = &ctx->hctx; |
374 | HMAC_CTX *hctx = &ctx->hctx; |
368 | |
375 | |
369 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
376 | require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0)); |
370 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
377 | require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet))); |
371 | len - sizeof (hmac_packet)); |
378 | require101 (HMAC_Final (hctx, hmac_digest, 0)); |
372 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
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373 | } |
379 | } |
374 | |
380 | |
375 | void |
381 | void |
376 | hmac_packet::hmac_set (crypto_ctx *ctx) |
382 | hmac_packet::hmac_set (crypto_ctx *ctx) |
377 | { |
383 | { |
378 | hmac_gen (ctx); |
384 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
379 | |
385 | hmac_gen (ctx, hmac_digest); |
380 | memcpy (hmac, hmac_digest, HMACLENGTH); |
386 | memcpy (hmac, hmac_digest, HMACLENGTH); |
381 | } |
387 | } |
382 | |
388 | |
383 | bool |
389 | bool |
384 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
390 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
385 | { |
391 | { |
386 | hmac_gen (ctx); |
392 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
387 | |
393 | hmac_gen (ctx, hmac_digest); |
388 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
394 | return slow_memeq (hmac, hmac_digest, HMACLENGTH); |
389 | } |
395 | } |
390 | |
396 | |
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397 | void |
391 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
398 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
392 | { |
399 | { |
393 | type = type_; |
400 | type = type_; |
394 | |
401 | |
395 | int src = THISNODE->id; |
402 | int src = THISNODE->id; |
396 | |
403 | |
… | |
… | |
401 | |
408 | |
402 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
409 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
403 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
410 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
404 | |
411 | |
405 | struct vpndata_packet : vpn_packet |
412 | struct vpndata_packet : vpn_packet |
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413 | { |
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414 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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415 | |
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416 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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417 | tap_packet *unpack (connection *conn, u32 &seqno); |
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418 | |
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419 | private: |
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420 | const u32 data_hdr_size () const |
406 | { |
421 | { |
407 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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408 | |
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409 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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410 | tap_packet *unpack (connection *conn, u32 &seqno); |
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411 | private: |
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412 | |
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413 | const u32 data_hdr_size () const |
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414 | { |
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415 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
422 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
416 | } |
|
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417 | }; |
423 | } |
|
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424 | }; |
418 | |
425 | |
419 | void |
426 | void |
420 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
427 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
421 | { |
428 | { |
422 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
429 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
… | |
… | |
424 | ptype type = PT_DATA_UNCOMPRESSED; |
431 | ptype type = PT_DATA_UNCOMPRESSED; |
425 | |
432 | |
426 | #if ENABLE_COMPRESSION |
433 | #if ENABLE_COMPRESSION |
427 | u8 cdata[MAX_MTU]; |
434 | u8 cdata[MAX_MTU]; |
428 | |
435 | |
429 | if (conn->features & ENABLE_COMPRESSION) |
436 | if (conn->features & FEATURE_COMPRESSION) |
430 | { |
437 | { |
431 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
438 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
432 | |
439 | |
433 | if (cl) |
440 | if (cl) |
434 | { |
441 | { |
… | |
… | |
440 | d[1] = cl; |
447 | d[1] = cl; |
441 | } |
448 | } |
442 | } |
449 | } |
443 | #endif |
450 | #endif |
444 | |
451 | |
445 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
452 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1)); |
446 | |
453 | |
447 | struct { |
454 | struct { |
448 | #if RAND_SIZE |
455 | #if RAND_SIZE |
449 | u8 rnd[RAND_SIZE]; |
456 | u8 rnd[RAND_SIZE]; |
450 | #endif |
457 | #endif |
451 | u32 seqno; |
458 | u32 seqno; |
452 | } datahdr; |
459 | } datahdr; |
453 | |
460 | |
454 | datahdr.seqno = ntohl (seqno); |
461 | datahdr.seqno = ntohl (seqno); |
455 | #if RAND_SIZE |
462 | #if RAND_SIZE |
456 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
463 | // NB: a constant (per session) random prefix |
|
|
464 | // is likely enough, but we don't take any chances. |
|
|
465 | conn->oiv.get (datahdr.rnd, RAND_SIZE); |
457 | #endif |
466 | #endif |
458 | |
467 | |
459 | require (EVP_EncryptUpdate (cctx, |
468 | require (EVP_EncryptUpdate (cctx, |
460 | (unsigned char *) data + outl, &outl2, |
469 | (unsigned char *) data + outl, &outl2, |
461 | (unsigned char *) &datahdr, DATAHDR)); |
470 | (unsigned char *) &datahdr, DATAHDR)); |
… | |
… | |
483 | int outl = 0, outl2; |
492 | int outl = 0, outl2; |
484 | tap_packet *p = new tap_packet; |
493 | tap_packet *p = new tap_packet; |
485 | u8 *d; |
494 | u8 *d; |
486 | u32 l = len - data_hdr_size (); |
495 | u32 l = len - data_hdr_size (); |
487 | |
496 | |
488 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
497 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0)); |
489 | |
498 | |
490 | #if ENABLE_COMPRESSION |
499 | #if ENABLE_COMPRESSION |
491 | u8 cdata[MAX_MTU]; |
500 | u8 cdata[MAX_MTU]; |
492 | |
501 | |
493 | if (type == PT_DATA_COMPRESSED) |
502 | if (type == PT_DATA_COMPRESSED) |
494 | d = cdata; |
503 | d = cdata; |
495 | else |
504 | else |
496 | #endif |
505 | #endif |
497 | d = &(*p)[6 + 6 - DATAHDR]; |
506 | d = &(*p)[6 + 6] - DATAHDR; |
498 | |
507 | |
499 | /* this overwrites part of the src mac, but we fix that later */ |
508 | // we play do evil games with the struct layout atm. |
|
|
509 | // pending better solutions, we at least do some verification. |
|
|
510 | // this is fine, as we left ISO territory long ago. |
|
|
511 | require (DATAHDR <= 16); |
|
|
512 | require ((u8 *)(&p->len + 1) == &(*p)[0]); |
|
|
513 | |
|
|
514 | // this can overwrite the len/dst/src fields |
500 | require (EVP_DecryptUpdate (cctx, |
515 | require (EVP_DecryptUpdate (cctx, |
501 | d, &outl2, |
516 | d, &outl2, |
502 | (unsigned char *)&data, len - data_hdr_size ())); |
517 | (unsigned char *)&data, len - data_hdr_size ())); |
503 | outl += outl2; |
518 | outl += outl2; |
504 | |
519 | |
… | |
… | |
535 | } |
550 | } |
536 | }; |
551 | }; |
537 | |
552 | |
538 | struct config_packet : vpn_packet |
553 | struct config_packet : vpn_packet |
539 | { |
554 | { |
540 | // actually, hmaclen cannot be checked because the hmac |
555 | u8 serial[SERIAL_SIZE]; |
541 | // field comes before this data, so peers with other |
|
|
542 | // hmacs simply will not work. |
|
|
543 | u8 prot_major, prot_minor, randsize, hmaclen; |
556 | u8 prot_major, prot_minor, randsize; |
544 | u8 flags, challengelen, features, pad3; |
557 | u8 flags, features, pad6, pad7, pad8; |
545 | u32 cipher_nid, digest_nid, hmac_nid; |
558 | u32 cipher_nid, mac_nid, auth_nid; |
546 | |
559 | |
547 | void setup (ptype type, int dst); |
560 | void setup (ptype type, int dst); |
548 | bool chk_config () const; |
561 | bool chk_config (const conf_node *conf, const sockinfo &rsi) const; |
549 | |
562 | |
550 | static u8 get_features () |
563 | static u8 get_features () |
551 | { |
564 | { |
552 | u8 f = 0; |
565 | u8 f = 0; |
553 | #if ENABLE_COMPRESSION |
566 | #if ENABLE_COMPRESSION |
… | |
… | |
561 | #endif |
574 | #endif |
562 | return f; |
575 | return f; |
563 | } |
576 | } |
564 | }; |
577 | }; |
565 | |
578 | |
|
|
579 | void |
566 | void config_packet::setup (ptype type, int dst) |
580 | config_packet::setup (ptype type, int dst) |
567 | { |
581 | { |
568 | prot_major = PROTOCOL_MAJOR; |
582 | prot_major = PROTOCOL_MAJOR; |
569 | prot_minor = PROTOCOL_MINOR; |
583 | prot_minor = PROTOCOL_MINOR; |
570 | randsize = RAND_SIZE; |
584 | randsize = RAND_SIZE; |
571 | hmaclen = HMACLENGTH; |
|
|
572 | flags = 0; |
585 | flags = 0; |
573 | challengelen = sizeof (rsachallenge); |
|
|
574 | features = get_features (); |
586 | features = get_features (); |
575 | |
587 | |
|
|
588 | strncpy ((char *)serial, conf.serial, sizeof (serial)); |
|
|
589 | |
576 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
590 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); |
577 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
|
|
578 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
591 | mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); |
|
|
592 | auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); |
579 | |
593 | |
580 | len = sizeof (*this) - sizeof (net_packet); |
594 | len = sizeof (*this) - sizeof (net_packet); |
581 | set_hdr (type, dst); |
595 | set_hdr (type, dst); |
582 | } |
596 | } |
583 | |
597 | |
584 | bool config_packet::chk_config () const |
598 | bool |
|
|
599 | config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const |
585 | { |
600 | { |
586 | if (prot_major != PROTOCOL_MAJOR) |
601 | if (prot_major != PROTOCOL_MAJOR) |
587 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
602 | slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"), |
|
|
603 | conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR); |
588 | else if (randsize != RAND_SIZE) |
604 | else if (randsize != RAND_SIZE) |
589 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
605 | slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"), |
590 | else if (hmaclen != HMACLENGTH) |
606 | conf->nodename, (const char *)rsi, randsize, RAND_SIZE); |
591 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
592 | else if (challengelen != sizeof (rsachallenge)) |
|
|
593 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
|
|
594 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
607 | 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)); |
608 | slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"), |
596 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
609 | conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ())); |
597 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
|
|
598 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
610 | else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ()))) |
599 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
611 | slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"), |
|
|
612 | conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); |
|
|
613 | else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) |
|
|
614 | slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"), |
|
|
615 | conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); |
600 | else |
616 | else |
|
|
617 | { |
|
|
618 | int cmp = memcmp (serial, ::conf.serial, sizeof (serial)); |
|
|
619 | |
|
|
620 | if (cmp > 0) |
|
|
621 | slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"), |
|
|
622 | conf->nodename, (const char *)rsi); |
|
|
623 | else if (cmp == 0) |
601 | return true; |
624 | return true; |
|
|
625 | } |
602 | |
626 | |
603 | return false; |
627 | return false; |
604 | } |
628 | } |
605 | |
629 | |
606 | struct auth_req_packet : config_packet |
630 | struct auth_req_packet : config_packet // UNPROTECTED |
607 | { |
631 | { |
608 | char magic[8]; |
632 | char magic[8]; |
609 | u8 initiate; // false if this is just an automatic reply |
633 | u8 initiate; // false if this is just an automatic reply |
610 | u8 protocols; // supported protocols (will be patched on forward) |
634 | u8 protocols; // supported protocols (will be patched on forward) |
611 | u8 pad2, pad3; |
635 | u8 pad2, pad3; |
612 | rsaid id; |
636 | auth_encr encr; |
613 | rsaencrdata encr; |
|
|
614 | |
637 | |
615 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
638 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
616 | { |
639 | { |
617 | config_packet::setup (PT_AUTH_REQ, dst); |
640 | config_packet::setup (PT_AUTH_REQ, dst); |
618 | strncpy (magic, MAGIC, 8); |
641 | memcpy (magic, MAGIC, 8); |
619 | initiate = !!initiate_; |
642 | initiate = !!initiate_; |
620 | protocols = protocols_; |
643 | protocols = protocols_; |
621 | |
644 | |
622 | len = sizeof (*this) - sizeof (net_packet); |
645 | len = sizeof (*this) - sizeof (net_packet); |
623 | } |
646 | } |
624 | }; |
647 | }; |
625 | |
648 | |
626 | struct auth_res_packet : config_packet |
649 | struct auth_res_packet : vpn_packet // UNPROTECTED |
627 | { |
650 | { |
628 | rsaid id; |
|
|
629 | u8 pad1, pad2, pad3; |
|
|
630 | u8 response_len; // encrypted length |
|
|
631 | rsaresponse response; |
651 | auth_response response; |
632 | |
652 | |
633 | auth_res_packet (int dst) |
653 | auth_res_packet (int dst) |
634 | { |
654 | { |
635 | config_packet::setup (PT_AUTH_RES, dst); |
655 | set_hdr (PT_AUTH_RES, dst); |
636 | |
656 | |
637 | len = sizeof (*this) - sizeof (net_packet); |
657 | len = sizeof (*this) - sizeof (net_packet); |
638 | } |
658 | } |
639 | }; |
659 | }; |
640 | |
660 | |
… | |
… | |
670 | }; |
690 | }; |
671 | |
691 | |
672 | ///////////////////////////////////////////////////////////////////////////// |
692 | ///////////////////////////////////////////////////////////////////////////// |
673 | |
693 | |
674 | void |
694 | void |
675 | connection::connection_established () |
695 | connection::connection_established (const sockinfo &rsi) |
676 | { |
696 | { |
677 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
697 | if (!have_snd_auth || !have_rcv_auth) |
|
|
698 | return; |
678 | |
699 | |
679 | if (ictx && octx) |
700 | si = rsi; |
|
|
701 | protocol = rsi.prot; |
|
|
702 | |
|
|
703 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
704 | conf->nodename, (const char *)rsi, |
|
|
705 | vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded", |
|
|
706 | PROTOCOL_MAJOR, prot_minor); |
|
|
707 | |
|
|
708 | if (::conf.script_node_up) |
|
|
709 | { |
|
|
710 | run_script_cb *cb = new run_script_cb; |
|
|
711 | cb->set<connection, &connection::script_node_up> (this); |
|
|
712 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
680 | { |
713 | } |
|
|
714 | |
|
|
715 | delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0); |
|
|
716 | iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); |
|
|
717 | |
|
|
718 | delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); |
|
|
719 | oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; |
|
|
720 | |
|
|
721 | oiv.reset (); |
|
|
722 | |
681 | // make sure rekeying timeouts are slightly asymmetric |
723 | // make sure rekeying timeouts are slightly asymmetric |
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
724 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
683 | rekey.start (rekey_interval, rekey_interval); |
725 | rekey.start (rekey_interval, rekey_interval); |
|
|
726 | |
|
|
727 | hmac_error = 0.; |
|
|
728 | |
684 | keepalive.start (::conf.keepalive); |
729 | keepalive.start (::conf.keepalive); |
685 | |
730 | |
686 | // send queued packets |
731 | // send queued packets |
687 | if (ictx && octx) |
|
|
688 | { |
|
|
689 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
732 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
690 | { |
733 | { |
691 | if (p->len) send_data_packet (p); |
734 | if (p->len) send_data_packet (p); |
692 | delete p; |
735 | delete p; |
693 | } |
736 | } |
694 | |
737 | |
695 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
738 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
696 | { |
739 | { |
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
740 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
698 | delete p; |
741 | delete p; |
699 | } |
|
|
700 | } |
|
|
701 | } |
742 | } |
|
|
743 | |
|
|
744 | vpn->connection_established (this); |
|
|
745 | } |
|
|
746 | |
|
|
747 | void |
|
|
748 | connection::reset_si () |
|
|
749 | { |
|
|
750 | if (vpn->can_direct (THISNODE, conf)) |
|
|
751 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
702 | else |
752 | else |
703 | { |
753 | { |
704 | retry_cnt = 0; |
|
|
705 | establish_connection.start (5); |
|
|
706 | keepalive.stop (); |
|
|
707 | rekey.stop (); |
|
|
708 | } |
|
|
709 | } |
|
|
710 | |
|
|
711 | void |
|
|
712 | connection::reset_si () |
|
|
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); |
754 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
726 | protocol = 0; |
755 | protocol = 0; |
727 | } |
756 | } |
728 | |
757 | |
729 | si.set (conf, protocol); |
758 | si.set (conf, protocol); |
730 | } |
759 | } |
… | |
… | |
733 | const sockinfo & |
762 | const sockinfo & |
734 | connection::forward_si (const sockinfo &si) const |
763 | connection::forward_si (const sockinfo &si) const |
735 | { |
764 | { |
736 | if (!si.valid ()) |
765 | if (!si.valid ()) |
737 | { |
766 | { |
738 | connection *r = vpn->find_router (); |
767 | connection *r = vpn->find_router_for (this); |
739 | |
768 | |
740 | if (r) |
769 | if (r) |
741 | { |
770 | { |
742 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
771 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
743 | conf->nodename, r->conf->nodename, (const char *)r->si); |
772 | conf->nodename, r->conf->nodename); |
744 | return r->si; |
773 | return r->si; |
745 | } |
774 | } |
746 | else |
775 | else |
747 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
776 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
748 | conf->nodename); |
777 | conf->nodename); |
749 | } |
778 | } |
750 | |
779 | |
751 | return si; |
780 | return si; |
752 | } |
781 | } |
753 | |
782 | |
754 | void |
783 | void |
755 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
784 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
756 | { |
785 | { |
757 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
786 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
758 | reset_connection (); |
787 | reset_connection ("packet send error"); |
759 | } |
788 | } |
760 | |
789 | |
761 | void |
790 | void |
762 | connection::send_ping (const sockinfo &si, u8 pong) |
791 | connection::send_ping (const sockinfo &si, u8 pong) |
763 | { |
792 | { |
764 | ping_packet *pkt = new ping_packet; |
793 | ping_packet *pkt = new ping_packet; |
765 | |
794 | |
766 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
795 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
796 | |
|
|
797 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
767 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
798 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
768 | |
799 | |
769 | delete pkt; |
800 | delete pkt; |
770 | } |
801 | } |
771 | |
802 | |
… | |
… | |
786 | void |
817 | void |
787 | connection::send_auth_request (const sockinfo &si, bool initiate) |
818 | connection::send_auth_request (const sockinfo &si, bool initiate) |
788 | { |
819 | { |
789 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
820 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
790 | |
821 | |
791 | rsachallenge chg; |
822 | generate_auth_data (); |
792 | rsa_cache.gen (pkt->id, chg); |
|
|
793 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
823 | auth_encrypt (conf->rsa_key, snd_auth, pkt->encr); |
794 | |
824 | |
795 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
825 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
796 | |
|
|
797 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
826 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
798 | |
827 | |
799 | delete pkt; |
828 | delete pkt; |
800 | } |
829 | } |
801 | |
830 | |
802 | void |
831 | void |
803 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
832 | connection::send_auth_response (const sockinfo &si) |
804 | { |
833 | { |
805 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
834 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
806 | |
835 | |
807 | pkt->id = id; |
836 | memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b); |
|
|
837 | auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac); |
808 | |
838 | |
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); |
839 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
814 | |
|
|
815 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
840 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
816 | |
841 | |
817 | delete pkt; |
842 | delete pkt; |
818 | } |
843 | } |
819 | |
844 | |
820 | void |
845 | void |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
846 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
822 | { |
847 | { |
823 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
848 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
824 | conf->id, rid, (const char *)rsi); |
849 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
850 | conf->protocols); |
825 | |
851 | |
826 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
852 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
827 | |
853 | |
828 | r->hmac_set (octx); |
854 | r->hmac_set (octx); |
829 | send_vpn_packet (r, si); |
855 | send_vpn_packet (r, si); |
… | |
… | |
832 | } |
858 | } |
833 | |
859 | |
834 | inline void |
860 | inline void |
835 | connection::establish_connection_cb (ev::timer &w, int revents) |
861 | connection::establish_connection_cb (ev::timer &w, int revents) |
836 | { |
862 | { |
837 | if (!ictx |
863 | if (!(ictx && octx) |
838 | && conf != THISNODE |
864 | && conf != THISNODE |
839 | && connectmode != conf_node::C_NEVER |
865 | && connectmode != conf_node::C_NEVER |
840 | && connectmode != conf_node::C_DISABLED |
866 | && connectmode != conf_node::C_DISABLED |
841 | && !w.is_active ()) |
867 | && !w.is_active ()) |
842 | { |
868 | { |
843 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
869 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
844 | // and stop trying. should probably be handled by a per-connection expire handler. |
870 | // and stop trying. should probably be handled by a per-connection expire handler. |
845 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
871 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
846 | { |
872 | { |
847 | reset_connection (); |
873 | reset_connection ("no demand"); |
848 | return; |
874 | return; |
849 | } |
875 | } |
850 | |
876 | |
851 | last_establish_attempt = ev_now (); |
877 | last_establish_attempt = ev_now (); |
852 | |
878 | |
… | |
… | |
854 | ? (retry_cnt & 3) + 1 |
880 | ? (retry_cnt & 3) + 1 |
855 | : 1 << (retry_cnt >> 2)); |
881 | : 1 << (retry_cnt >> 2)); |
856 | |
882 | |
857 | reset_si (); |
883 | reset_si (); |
858 | |
884 | |
859 | bool slow = si.prot & PROT_SLOW; |
885 | bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power); |
860 | |
886 | |
861 | if (si.prot && !si.host) |
887 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
862 | { |
888 | { |
863 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
864 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
889 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
865 | w.start (1); |
890 | w.start (1); |
866 | vpn->send_connect_request (conf->id); |
891 | vpn->send_connect_request (this); |
867 | } |
892 | } |
868 | else |
893 | else |
869 | { |
894 | { |
870 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
895 | if (si.valid ()) |
|
|
896 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
897 | conf->nodename, (const char *)si); |
871 | |
898 | |
872 | const sockinfo &dsi = forward_si (si); |
899 | const sockinfo &dsi = forward_si (si); |
873 | |
900 | |
874 | slow = slow || (dsi.prot & PROT_SLOW); |
901 | slow = slow || (dsi.prot & PROT_SLOW); |
875 | |
902 | |
876 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
903 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
877 | { |
904 | { |
878 | if (retry_cnt < 4) |
905 | // use ping after the first few retries |
|
|
906 | // TODO: on rekeys, the other node might not interpret ping correctly, |
|
|
907 | // TODO: as it will still have a valid connection |
|
|
908 | if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power)) |
879 | send_auth_request (dsi, true); |
909 | send_auth_request (dsi, true); |
880 | else |
910 | else |
881 | send_ping (dsi, 0); |
911 | send_ping (dsi, 0); |
882 | } |
912 | } |
883 | } |
913 | } |
884 | |
914 | |
885 | retry_int *= slow ? 8. : 0.9; |
915 | retry_int *= slow ? 4. : 0.9; |
886 | |
916 | |
887 | if (retry_int < conf->max_retry) |
917 | if (retry_int < conf->max_retry) |
888 | retry_cnt++; |
918 | retry_cnt++; |
889 | else |
919 | else |
890 | retry_int = conf->max_retry; |
920 | retry_int = conf->max_retry; |
… | |
… | |
892 | w.start (retry_int); |
922 | w.start (retry_int); |
893 | } |
923 | } |
894 | } |
924 | } |
895 | |
925 | |
896 | void |
926 | void |
897 | connection::reset_connection () |
927 | connection::reset_connection (const char *reason) |
898 | { |
928 | { |
899 | if (ictx && octx) |
929 | if (ictx && octx) |
900 | { |
930 | { |
901 | slog (L_INFO, _("%s(%s): connection lost"), |
931 | slog (L_INFO, _("%s(%s): connection lost (%s)"), |
902 | conf->nodename, (const char *)si); |
932 | conf->nodename, (const char *)si, reason); |
903 | |
933 | |
904 | if (::conf.script_node_down) |
934 | if (::conf.script_node_down) |
905 | { |
935 | { |
906 | run_script_cb *cb = new run_script_cb; |
936 | run_script_cb *cb = new run_script_cb; |
907 | cb->set<connection, &connection::script_node_down> (this); |
937 | cb->set<connection, &connection::script_node_down> (this); |
… | |
… | |
909 | } |
939 | } |
910 | } |
940 | } |
911 | |
941 | |
912 | delete ictx; ictx = 0; |
942 | delete ictx; ictx = 0; |
913 | delete octx; octx = 0; |
943 | delete octx; octx = 0; |
914 | #if ENABLE_DNS |
|
|
915 | dnsv4_reset_connection (); |
|
|
916 | #endif |
|
|
917 | |
944 | |
918 | si.host = 0; |
945 | si.host = 0; |
919 | |
946 | |
|
|
947 | have_snd_auth = false; |
|
|
948 | have_rcv_auth = false; |
|
|
949 | auth_expire = 0.; |
|
|
950 | |
920 | last_activity = 0; |
951 | last_activity = 0.; |
|
|
952 | //last_si_change = 0.; |
921 | retry_cnt = 0; |
953 | retry_cnt = 0; |
922 | |
954 | |
923 | rekey.stop (); |
955 | rekey.stop (); |
924 | keepalive.stop (); |
956 | keepalive.stop (); |
925 | establish_connection.stop (); |
957 | establish_connection.stop (); |
… | |
… | |
929 | connection::shutdown () |
961 | connection::shutdown () |
930 | { |
962 | { |
931 | if (ictx && octx) |
963 | if (ictx && octx) |
932 | send_reset (si); |
964 | send_reset (si); |
933 | |
965 | |
934 | reset_connection (); |
966 | reset_connection ("shutdown"); |
935 | } |
967 | } |
936 | |
968 | |
|
|
969 | // poor-man's rekeying |
937 | inline void |
970 | inline void |
938 | connection::rekey_cb (ev::timer &w, int revents) |
971 | connection::rekey_cb (ev::timer &w, int revents) |
939 | { |
972 | { |
940 | reset_connection (); |
973 | reset_connection ("rekeying"); |
941 | establish_connection (); |
974 | establish_connection (); |
942 | } |
975 | } |
943 | |
976 | |
944 | void |
977 | void |
945 | connection::send_data_packet (tap_packet *pkt) |
978 | connection::send_data_packet (tap_packet *pkt) |
… | |
… | |
962 | |
995 | |
963 | void |
996 | void |
964 | connection::post_inject_queue () |
997 | connection::post_inject_queue () |
965 | { |
998 | { |
966 | // force a connection every now and when when packets are sent (max 1/s) |
999 | // force a connection every now and when when packets are sent (max 1/s) |
967 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
1000 | if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary |
968 | establish_connection.stop (); |
1001 | establish_connection.stop (); |
969 | |
1002 | |
970 | establish_connection (); |
1003 | establish_connection (); |
971 | } |
1004 | } |
972 | |
1005 | |
… | |
… | |
980 | data_queue.put (new tap_packet (*pkt)); |
1013 | data_queue.put (new tap_packet (*pkt)); |
981 | post_inject_queue (); |
1014 | post_inject_queue (); |
982 | } |
1015 | } |
983 | } |
1016 | } |
984 | |
1017 | |
|
|
1018 | void |
985 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1019 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
986 | { |
1020 | { |
987 | if (ictx && octx) |
1021 | if (ictx && octx) |
988 | send_vpn_packet (pkt, si, tos); |
1022 | send_vpn_packet (pkt, si, tos); |
989 | else |
1023 | else |
990 | { |
1024 | { |
… | |
… | |
996 | void |
1030 | void |
997 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1031 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
998 | { |
1032 | { |
999 | last_activity = ev_now (); |
1033 | last_activity = ev_now (); |
1000 | |
1034 | |
1001 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1035 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
1002 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1036 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
1003 | |
1037 | |
1004 | if (connectmode == conf_node::C_DISABLED) |
1038 | if (connectmode == conf_node::C_DISABLED) |
1005 | return; |
1039 | return; |
1006 | |
1040 | |
1007 | switch (pkt->typ ()) |
1041 | switch (pkt->typ ()) |
1008 | { |
1042 | { |
1009 | case vpn_packet::PT_PING: |
1043 | case vpn_packet::PT_PING: |
|
|
1044 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1045 | |
1010 | // we send pings instead of auth packets after some retries, |
1046 | // we send pings instead of auth packets after some retries, |
1011 | // so reset the retry counter and establish a connection |
1047 | // so reset the retry counter and establish a connection |
1012 | // when we receive a ping. |
1048 | // when we receive a ping. |
1013 | if (!ictx) |
1049 | if (!ictx) |
1014 | { |
1050 | { |
1015 | if (auth_rate_limiter.can (rsi)) |
1051 | if (auth_rate_limiter.can (rsi)) |
1016 | send_auth_request (rsi, true); |
1052 | send_auth_request (rsi, true); |
1017 | } |
1053 | } |
1018 | else |
1054 | else |
|
|
1055 | // we would love to change the socket address here, but ping's aren't |
|
|
1056 | // authenticated, so we best ignore it. |
1019 | send_ping (rsi, 1); // pong |
1057 | send_ping (rsi, 1); // pong |
1020 | |
1058 | |
1021 | break; |
1059 | break; |
1022 | |
1060 | |
1023 | case vpn_packet::PT_PONG: |
1061 | case vpn_packet::PT_PONG: |
|
|
1062 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1063 | |
|
|
1064 | // a PONG might mean that the other side doesn't really know |
|
|
1065 | // about our desire for communication. |
|
|
1066 | establish_connection (); |
1024 | break; |
1067 | break; |
1025 | |
1068 | |
1026 | case vpn_packet::PT_RESET: |
1069 | case vpn_packet::PT_RESET: |
|
|
1070 | slog (L_TRACE, "%s >> PT_RESET", conf->nodename); |
|
|
1071 | |
|
|
1072 | if (ictx && octx) |
1027 | { |
1073 | { |
1028 | reset_connection (); |
1074 | reset_connection ("remote reset"); |
1029 | |
1075 | |
1030 | config_packet *p = (config_packet *) pkt; |
1076 | config_packet *p = (config_packet *) pkt; |
1031 | |
1077 | |
1032 | if (!p->chk_config ()) |
1078 | if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS) |
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 (); |
1079 | establish_connection (); |
1040 | } |
1080 | } |
|
|
1081 | |
1041 | break; |
1082 | break; |
1042 | |
1083 | |
1043 | case vpn_packet::PT_AUTH_REQ: |
1084 | case vpn_packet::PT_AUTH_REQ: |
1044 | if (auth_rate_limiter.can (rsi)) |
1085 | if (auth_rate_limiter.can (rsi)) |
1045 | { |
1086 | { |
1046 | auth_req_packet *p = (auth_req_packet *) pkt; |
1087 | auth_req_packet *p = (auth_req_packet *)pkt; |
1047 | |
1088 | |
1048 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1089 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1090 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1091 | p->protocols, p->features); |
1049 | |
1092 | |
1050 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1093 | if (memcmp (p->magic, MAGIC, 8)) |
|
|
1094 | { |
|
|
1095 | slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"), |
|
|
1096 | conf->nodename, (const char *)rsi); |
|
|
1097 | } |
|
|
1098 | else if (p->chk_config (conf, rsi)) |
1051 | { |
1099 | { |
1052 | if (p->prot_minor != PROTOCOL_MINOR) |
1100 | if (p->prot_minor != PROTOCOL_MINOR) |
1053 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1101 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1054 | conf->nodename, (const char *)rsi, |
1102 | conf->nodename, (const char *)rsi, |
1055 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1103 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1056 | |
1104 | |
1057 | if (p->initiate) |
1105 | if (p->initiate) |
|
|
1106 | { |
1058 | send_auth_request (rsi, false); |
1107 | send_auth_request (rsi, false); |
1059 | |
1108 | |
1060 | rsachallenge k; |
1109 | if (ictx && octx) |
|
|
1110 | reset_connection ("reconnect"); |
|
|
1111 | } |
1061 | |
1112 | |
|
|
1113 | auth_data auth; |
|
|
1114 | |
1062 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
1115 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
1063 | { |
1116 | { |
1064 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1117 | 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)); |
1118 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1066 | break; |
|
|
1067 | } |
1119 | } |
1068 | else |
1120 | else |
1069 | { |
1121 | { |
1070 | delete octx; |
1122 | bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth); |
1071 | |
1123 | |
1072 | octx = new crypto_ctx (k, 1); |
1124 | rcv_auth = auth; |
1073 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1125 | have_rcv_auth = true; |
1074 | |
1126 | |
|
|
1127 | send_auth_response (rsi); |
|
|
1128 | |
|
|
1129 | if (chg) |
|
|
1130 | { |
1075 | conf->protocols = p->protocols; |
1131 | conf->protocols = p->protocols; |
1076 | features = p->features & config_packet::get_features (); |
1132 | features = p->features & config_packet::get_features (); |
1077 | |
1133 | |
1078 | send_auth_response (rsi, p->id, k); |
|
|
1079 | |
|
|
1080 | connection_established (); |
1134 | connection_established (rsi); |
1081 | |
|
|
1082 | break; |
1135 | } |
1083 | } |
1136 | } |
|
|
1137 | |
|
|
1138 | break; |
1084 | } |
1139 | } |
1085 | else |
|
|
1086 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
|
|
1087 | conf->nodename, (const char *)rsi); |
|
|
1088 | |
1140 | |
1089 | send_reset (rsi); |
1141 | send_reset (rsi); |
1090 | } |
1142 | } |
1091 | |
1143 | |
1092 | break; |
1144 | break; |
1093 | |
1145 | |
1094 | case vpn_packet::PT_AUTH_RES: |
1146 | case vpn_packet::PT_AUTH_RES: |
1095 | { |
1147 | { |
1096 | auth_res_packet *p = (auth_res_packet *) pkt; |
1148 | auth_res_packet *p = (auth_res_packet *)pkt; |
1097 | |
1149 | |
1098 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1150 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
1099 | |
1151 | |
1100 | if (p->chk_config ()) |
1152 | auth_mac local_mac; |
|
|
1153 | auth_hash (snd_auth, p->response.ecdh, local_mac); |
|
|
1154 | |
|
|
1155 | if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac)) |
1101 | { |
1156 | { |
1102 | if (p->prot_minor != PROTOCOL_MINOR) |
|
|
1103 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
1104 | conf->nodename, (const char *)rsi, |
|
|
1105 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
1106 | |
|
|
1107 | rsachallenge chg; |
|
|
1108 | |
|
|
1109 | if (!rsa_cache.find (p->id, chg)) |
|
|
1110 | { |
|
|
1111 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1157 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
1112 | conf->nodename, (const char *)rsi); |
1158 | conf->nodename, (const char *)rsi); |
1113 | break; |
|
|
1114 | } |
1159 | } |
1115 | else |
1160 | else if (!have_snd_auth) |
1116 | { |
1161 | { |
1117 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1162 | memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b); |
1118 | |
1163 | |
1119 | if (!p->hmac_chk (cctx)) |
1164 | have_snd_auth = true; |
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 | } |
|
|
1126 | else |
|
|
1127 | { |
|
|
1128 | rsaresponse h; |
|
|
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 (); |
1165 | connection_established (rsi); |
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 | |
|
|
1163 | delete cctx; |
|
|
1164 | } |
|
|
1165 | } |
1166 | } |
1166 | } |
1167 | } |
1167 | |
|
|
1168 | send_reset (rsi); |
|
|
1169 | break; |
1168 | break; |
1170 | |
1169 | |
1171 | case vpn_packet::PT_DATA_COMPRESSED: |
1170 | case vpn_packet::PT_DATA_COMPRESSED: |
1172 | #if !ENABLE_COMPRESSION |
1171 | #if !ENABLE_COMPRESSION |
1173 | send_reset (rsi); |
1172 | send_reset (rsi); |
… | |
… | |
1179 | if (ictx && octx) |
1178 | if (ictx && octx) |
1180 | { |
1179 | { |
1181 | vpndata_packet *p = (vpndata_packet *)pkt; |
1180 | vpndata_packet *p = (vpndata_packet *)pkt; |
1182 | |
1181 | |
1183 | if (!p->hmac_chk (ictx)) |
1182 | if (!p->hmac_chk (ictx)) |
|
|
1183 | { |
|
|
1184 | // rekeying often creates temporary hmac auth floods |
|
|
1185 | // we assume they don't take longer than a few seconds normally, |
|
|
1186 | // and suppress messages and resets during that time. |
|
|
1187 | //TODO: should be done per source address |
|
|
1188 | if (!hmac_error) |
|
|
1189 | { |
|
|
1190 | hmac_error = ev_now () + 3; |
|
|
1191 | break; |
|
|
1192 | } |
|
|
1193 | else if (hmac_error >= ev_now ()) |
|
|
1194 | break; // silently suppress |
|
|
1195 | else |
|
|
1196 | { |
1184 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1197 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1185 | "could be an attack, or just corruption or a synchronization error"), |
1198 | "could be an attack, or just corruption or a synchronization error."), |
1186 | conf->nodename, (const char *)rsi); |
1199 | conf->nodename, (const char *)rsi); |
|
|
1200 | // reset |
|
|
1201 | } |
|
|
1202 | } |
1187 | else |
1203 | else |
1188 | { |
1204 | { |
1189 | u32 seqno; |
1205 | u32 seqno; |
1190 | tap_packet *d = p->unpack (this, seqno); |
1206 | tap_packet *d = p->unpack (this, seqno); |
|
|
1207 | int seqclass = iseqno.seqno_classify (seqno); |
1191 | |
1208 | |
1192 | if (iseqno.recv_ok (seqno)) |
1209 | hmac_error = 0; |
|
|
1210 | |
|
|
1211 | if (seqclass == 0) // ok |
1193 | { |
1212 | { |
1194 | vpn->tap->send (d); |
1213 | vpn->tap->send (d); |
1195 | |
1214 | |
1196 | if (si != rsi) |
1215 | if (si != rsi) |
1197 | { |
1216 | { |
1198 | // fast re-sync on source address changes, useful especially for tcp/ip |
1217 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1218 | //if (last_si_change < ev_now () + 5.) |
1199 | si = rsi; |
1219 | // { |
1200 | |
|
|
1201 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1220 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1202 | conf->nodename, (const char *)si, (const char *)rsi); |
1221 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1222 | |
|
|
1223 | si = rsi; |
|
|
1224 | |
|
|
1225 | if (::conf.script_node_change) |
|
|
1226 | { |
|
|
1227 | run_script_cb *cb = new run_script_cb; |
|
|
1228 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1229 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1230 | } |
|
|
1231 | |
|
|
1232 | // } |
|
|
1233 | //else |
|
|
1234 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1235 | // conf->nodename, (const char *)si, (const char *)rsi); |
1203 | } |
1236 | } |
|
|
1237 | } |
|
|
1238 | else if (seqclass == 1) // far history |
|
|
1239 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1240 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1241 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1242 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1243 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1244 | else if (seqclass == 3) // reset |
|
|
1245 | { |
|
|
1246 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1247 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1248 | send_reset (rsi); |
1204 | } |
1249 | } |
1205 | |
1250 | |
1206 | delete d; |
1251 | delete d; |
1207 | break; |
1252 | break; |
1208 | } |
1253 | } |
… | |
… | |
1212 | break; |
1257 | break; |
1213 | |
1258 | |
1214 | case vpn_packet::PT_CONNECT_REQ: |
1259 | case vpn_packet::PT_CONNECT_REQ: |
1215 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1260 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1216 | { |
1261 | { |
1217 | connect_req_packet *p = (connect_req_packet *) pkt; |
1262 | connect_req_packet *p = (connect_req_packet *)pkt; |
1218 | |
1263 | |
1219 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1264 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1220 | { |
1265 | { |
1221 | connection *c = vpn->conns[p->id - 1]; |
1266 | connection *c = vpn->conns[p->id - 1]; |
1222 | conf->protocols = p->protocols; |
1267 | conf->protocols = p->protocols; |
1223 | |
1268 | |
1224 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
1269 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1270 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1271 | p->protocols, |
1225 | conf->id, p->id, c->ictx && c->octx); |
1272 | c->ictx && c->octx); |
1226 | |
1273 | |
1227 | if (c->ictx && c->octx) |
1274 | if (c->ictx && c->octx) |
1228 | { |
1275 | { |
1229 | // send connect_info packets to both sides, in case one is |
1276 | // send connect_info packets to both sides, in case one is |
1230 | // behind a nat firewall (or both ;) |
1277 | // behind a nat firewall (or both ;) |
… | |
… | |
1253 | |
1300 | |
1254 | c->conf->protocols = p->protocols; |
1301 | c->conf->protocols = p->protocols; |
1255 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1302 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1256 | p->si.upgrade_protocol (protocol, c->conf); |
1303 | p->si.upgrade_protocol (protocol, c->conf); |
1257 | |
1304 | |
1258 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1305 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1259 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1306 | conf->nodename, |
|
|
1307 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1308 | (const char *)p->si, |
|
|
1309 | p->protocols, |
|
|
1310 | protocol, |
|
|
1311 | p->si.supported_protocols (c->conf), |
|
|
1312 | !c->ictx && !c->octx); |
1260 | |
1313 | |
1261 | const sockinfo &dsi = forward_si (p->si); |
1314 | const sockinfo &dsi = forward_si (p->si); |
1262 | |
1315 | |
1263 | if (dsi.valid ()) |
1316 | if (dsi.valid ()) |
1264 | c->send_auth_request (dsi, true); |
1317 | c->send_auth_request (dsi, true); |
|
|
1318 | else |
|
|
1319 | slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
|
|
1320 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1321 | (const char *)p->si); |
1265 | } |
1322 | } |
1266 | else |
1323 | else |
1267 | slog (L_WARN, |
1324 | slog (L_WARN, |
1268 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1325 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1269 | p->id); |
1326 | p->id); |
… | |
… | |
1278 | } |
1335 | } |
1279 | |
1336 | |
1280 | inline void |
1337 | inline void |
1281 | connection::keepalive_cb (ev::timer &w, int revents) |
1338 | connection::keepalive_cb (ev::timer &w, int revents) |
1282 | { |
1339 | { |
1283 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1340 | ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
|
|
1341 | |
|
|
1342 | if (when >= 0) |
|
|
1343 | w.start (when); |
|
|
1344 | else if (when < -15) |
1284 | { |
1345 | { |
1285 | reset_connection (); |
1346 | reset_connection ("keepalive overdue"); |
1286 | establish_connection (); |
1347 | establish_connection (); |
1287 | } |
1348 | } |
1288 | else if (ev_now () < last_activity + ::conf.keepalive) |
|
|
1289 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
|
|
1290 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1349 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1291 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1350 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1292 | { |
1351 | { |
|
|
1352 | w.start (3); |
1293 | send_ping (si); |
1353 | send_ping (si); |
1294 | w.start (5); |
|
|
1295 | } |
1354 | } |
1296 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1355 | else if (when >= -10) |
1297 | // hold ondemand connections implicitly a few seconds longer |
1356 | // hold ondemand connections implicitly a few seconds longer |
1298 | // should delete octx, though, or something like that ;) |
1357 | // should delete octx, though, or something like that ;) |
1299 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1358 | w.start (when + 10); |
1300 | else |
1359 | else |
1301 | reset_connection (); |
1360 | reset_connection ("keepalive timeout"); |
1302 | } |
1361 | } |
1303 | |
1362 | |
|
|
1363 | void |
1304 | void connection::send_connect_request (int id) |
1364 | connection::send_connect_request (int id) |
1305 | { |
1365 | { |
1306 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1366 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1307 | |
1367 | |
1308 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1368 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1369 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1370 | THISNODE->protocols); |
1309 | p->hmac_set (octx); |
1371 | p->hmac_set (octx); |
1310 | send_vpn_packet (p, si); |
1372 | send_vpn_packet (p, si); |
1311 | |
1373 | |
1312 | delete p; |
1374 | delete p; |
1313 | } |
1375 | } |
1314 | |
1376 | |
|
|
1377 | void |
1315 | void connection::script_init_env (const char *ext) |
1378 | connection::script_init_env (const char *ext) |
1316 | { |
1379 | { |
1317 | char *env; |
1380 | char *env; |
1318 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1381 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1319 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1382 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1320 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1383 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1321 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1384 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1322 | conf->id & 0xff); putenv (env); |
1385 | conf->id & 0xff); putenv (env); |
1323 | } |
1386 | } |
1324 | |
1387 | |
|
|
1388 | void |
1325 | void connection::script_init_connect_env () |
1389 | connection::script_init_connect_env () |
1326 | { |
1390 | { |
1327 | vpn->script_init_env (); |
1391 | vpn->script_init_env (); |
1328 | |
1392 | |
1329 | char *env; |
1393 | char *env; |
1330 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1394 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1395 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1331 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1396 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1332 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1397 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1333 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1398 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1334 | } |
1399 | } |
1335 | |
1400 | |
1336 | inline const char * |
1401 | inline const char * |
1337 | connection::script_node_up () |
1402 | connection::script_node_up () |
1338 | { |
1403 | { |
… | |
… | |
1348 | |
1413 | |
1349 | return filename; |
1414 | return filename; |
1350 | } |
1415 | } |
1351 | |
1416 | |
1352 | inline const char * |
1417 | inline const char * |
|
|
1418 | connection::script_node_change () |
|
|
1419 | { |
|
|
1420 | script_init_connect_env (); |
|
|
1421 | |
|
|
1422 | putenv ((char *)"STATE=change"); |
|
|
1423 | |
|
|
1424 | char *filename; |
|
|
1425 | asprintf (&filename, |
|
|
1426 | "%s/%s", |
|
|
1427 | confbase, |
|
|
1428 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
|
|
1429 | |
|
|
1430 | return filename; |
|
|
1431 | } |
|
|
1432 | |
|
|
1433 | inline const char * |
1353 | connection::script_node_down () |
1434 | connection::script_node_down () |
1354 | { |
1435 | { |
1355 | script_init_connect_env (); |
1436 | script_init_connect_env (); |
1356 | |
1437 | |
1357 | putenv ((char *)"STATE=down"); |
1438 | putenv ((char *)"STATE=down"); |
… | |
… | |
1368 | connection::connection (struct vpn *vpn, conf_node *conf) |
1449 | connection::connection (struct vpn *vpn, conf_node *conf) |
1369 | : vpn(vpn), conf(conf), |
1450 | : vpn(vpn), conf(conf), |
1370 | #if ENABLE_DNS |
1451 | #if ENABLE_DNS |
1371 | dns (0), |
1452 | dns (0), |
1372 | #endif |
1453 | #endif |
1373 | data_queue(conf->max_ttl, conf->max_queue), |
1454 | data_queue(conf->max_ttl, conf->max_queue + 1), |
1374 | vpn_queue(conf->max_ttl, conf->max_queue) |
1455 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1375 | { |
1456 | { |
1376 | rekey .set<connection, &connection::rekey_cb > (this); |
1457 | rekey .set<connection, &connection::rekey_cb > (this); |
1377 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1458 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1378 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1459 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1379 | |
1460 | |
1380 | last_establish_attempt = 0.; |
1461 | last_establish_attempt = 0.; |
1381 | octx = ictx = 0; |
1462 | octx = ictx = 0; |
1382 | |
1463 | |
1383 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1384 | conf->protocols = PROT_UDPv4; |
|
|
1385 | |
|
|
1386 | connectmode = conf->connectmode; |
1464 | connectmode = conf->connectmode; |
1387 | |
1465 | |
1388 | // queue a dummy packet to force an initial connection attempt |
1466 | // queue a dummy packet to force an initial connection attempt |
1389 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1467 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1390 | vpn_queue.put (new net_packet); |
1468 | vpn_queue.put (new net_packet); |
1391 | |
1469 | |
1392 | reset_connection (); |
1470 | reset_connection ("startup"); |
1393 | } |
1471 | } |
1394 | |
1472 | |
1395 | connection::~connection () |
1473 | connection::~connection () |
1396 | { |
1474 | { |
1397 | shutdown (); |
1475 | shutdown (); |
1398 | } |
1476 | } |
1399 | |
1477 | |
|
|
1478 | void |
1400 | void connection_init () |
1479 | connection_init () |
1401 | { |
1480 | { |
1402 | auth_rate_limiter.clear (); |
1481 | auth_rate_limiter.clear (); |
1403 | reset_rate_limiter.clear (); |
1482 | reset_rate_limiter.clear (); |
1404 | } |
1483 | } |
1405 | |
1484 | |