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) 2003-2008,2010,2011,2013,2016 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 | |
|
|
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> |
42 | |
43 | |
43 | #include "conf.h" |
44 | #include "conf.h" |
44 | #include "slog.h" |
45 | #include "slog.h" |
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46 | #include "crypto.h" |
45 | #include "device.h" |
47 | #include "device.h" |
46 | #include "vpn.h" |
48 | #include "vpn.h" |
47 | #include "connection.h" |
49 | #include "connection.h" |
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50 | #include "hkdf.h" |
48 | |
51 | |
49 | #include "netcompat.h" |
52 | #include "netcompat.h" |
50 | |
53 | |
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 |
54 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic |
56 | |
55 | |
57 | #define ULTRA_FAST 1 |
56 | #define ULTRA_FAST 1 |
58 | #define HLOG 15 |
57 | #define HLOG 15 |
59 | #include "lzf/lzf.h" |
58 | #include "lzf/lzf.h" |
60 | #include "lzf/lzf_c.c" |
59 | #include "lzf/lzf_c.c" |
… | |
… | |
63 | ////////////////////////////////////////////////////////////////////////////// |
62 | ////////////////////////////////////////////////////////////////////////////// |
64 | |
63 | |
65 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
64 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
66 | static ev::child rs_child_ev; |
65 | static ev::child rs_child_ev; |
67 | |
66 | |
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67 | namespace |
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68 | { |
68 | void // c++ requires external linkage here, apparently :( |
69 | void // c++ requires external linkage here, apparently :( |
69 | rs_child_cb (ev::child &w, int revents) |
70 | rs_child_cb (ev::child &w, int revents) |
70 | { |
71 | { |
71 | w.stop (); |
72 | w.stop (); |
72 | |
73 | |
73 | if (rs_queue.empty ()) |
74 | if (rs_queue.empty ()) |
74 | return; |
75 | return; |
75 | |
76 | |
76 | pid_t pid = run_script (*rs_queue.front ().first, false); |
77 | pid_t pid = run_script (*rs_queue.front ().first, false); |
77 | if (pid) |
78 | if (pid) |
78 | { |
79 | { |
79 | w.set (pid); |
80 | w.set (pid); |
80 | w.start (); |
81 | w.start (); |
81 | } |
82 | } |
82 | else |
83 | else |
83 | slog (L_WARN, rs_queue.front ().second); |
84 | slog (L_WARN, rs_queue.front ().second); |
84 | |
85 | |
85 | delete rs_queue.front ().first; |
86 | delete rs_queue.front ().first; |
86 | rs_queue.pop (); |
87 | rs_queue.pop (); |
87 | } |
88 | } |
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89 | }; |
88 | |
90 | |
89 | // despite the fancy name, this is quite a hack |
91 | // despite the fancy name, this is quite a hack |
90 | static void |
92 | static void |
91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
93 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
92 | { |
94 | { |
… | |
… | |
102 | ////////////////////////////////////////////////////////////////////////////// |
104 | ////////////////////////////////////////////////////////////////////////////// |
103 | |
105 | |
104 | struct crypto_ctx |
106 | struct crypto_ctx |
105 | { |
107 | { |
106 | EVP_CIPHER_CTX cctx; |
108 | EVP_CIPHER_CTX cctx; |
107 | HMAC_CTX hctx; |
109 | hmac hctx; |
108 | |
110 | |
109 | crypto_ctx (const rsachallenge &challenge, int enc); |
111 | crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc); |
110 | ~crypto_ctx (); |
112 | ~crypto_ctx (); |
111 | }; |
113 | }; |
112 | |
114 | |
113 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
115 | crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc) |
114 | { |
116 | { |
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117 | ecdh_key s; |
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118 | |
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119 | curve25519_combine (a, b, s); |
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120 | |
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121 | { |
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122 | u8 mac_key[MAC_KEYSIZE]; |
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123 | static const unsigned char mac_info[] = "gvpe mac key"; |
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124 | |
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125 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
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126 | kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key)); |
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127 | kdf.extract (s, sizeof (s)); |
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128 | kdf.extract_done (HKDF_PRF_HASH ()); |
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129 | kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info)); |
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130 | |
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131 | hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ()); |
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132 | } |
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133 | |
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134 | { |
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135 | u8 cipher_key[CIPHER_KEYSIZE]; |
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136 | static const unsigned char cipher_info[] = "gvpe cipher key"; |
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137 | |
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138 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
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139 | kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key)); |
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140 | kdf.extract (s, sizeof (s)); |
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141 | kdf.extract_done (HKDF_PRF_HASH ()); |
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142 | kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info)); |
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143 | |
115 | EVP_CIPHER_CTX_init (&cctx); |
144 | EVP_CIPHER_CTX_init (&cctx); |
116 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
145 | require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc)); |
117 | HMAC_CTX_init (&hctx); |
146 | } |
118 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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119 | } |
147 | } |
120 | |
148 | |
121 | crypto_ctx::~crypto_ctx () |
149 | crypto_ctx::~crypto_ctx () |
122 | { |
150 | { |
123 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
151 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
124 | HMAC_CTX_cleanup (&hctx); |
152 | } |
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153 | |
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154 | static inline void |
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155 | auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr) |
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156 | { |
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157 | if (RSA_public_encrypt (sizeof (auth.rsa), |
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158 | (unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa, |
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159 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
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160 | fatal ("RSA_public_encrypt error"); |
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161 | |
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162 | memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh)); |
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163 | } |
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164 | |
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165 | static inline bool |
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166 | auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth) |
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167 | { |
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168 | u8 rsa_decrypt[RSA_KEYLEN]; |
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169 | |
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170 | if (RSA_private_decrypt (sizeof (encr.rsa), |
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171 | (const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt, |
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172 | key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa)) |
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173 | return 0; |
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174 | |
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175 | memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa)); |
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176 | memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh)); |
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177 | |
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178 | return 1; |
125 | } |
179 | } |
126 | |
180 | |
127 | static void |
181 | static void |
128 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
182 | auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac) |
129 | { |
183 | { |
130 | EVP_MD_CTX ctx; |
184 | hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt |
131 | |
185 | kdf.extract (&auth.rsa, sizeof (auth.rsa)); |
132 | EVP_MD_CTX_init (&ctx); |
186 | kdf.extract_done (); |
133 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
187 | 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 | } |
188 | } |
139 | |
189 | |
140 | struct rsa_entry |
190 | void |
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191 | connection::generate_auth_data () |
141 | { |
192 | { |
142 | tstamp expire; |
193 | 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 | { |
194 | { |
155 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
195 | // request data |
156 | { |
196 | rand_fill (snd_auth.rsa); |
157 | memcpy (&chg, &i->chg, sizeof chg); |
197 | curve25519_generate (snd_ecdh_a, snd_auth.ecdh); |
158 | |
198 | |
159 | erase (i); |
199 | // eventual response data |
160 | return true; |
200 | curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); |
161 | } |
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162 | } |
201 | } |
163 | |
202 | |
164 | if (!cleaner.is_active ()) |
203 | // 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; |
204 | 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 | } |
205 | } |
208 | |
206 | |
209 | ////////////////////////////////////////////////////////////////////////////// |
207 | ////////////////////////////////////////////////////////////////////////////// |
210 | |
208 | |
211 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
209 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
… | |
… | |
225 | delete p; |
223 | delete p; |
226 | |
224 | |
227 | delete [] queue; |
225 | delete [] queue; |
228 | } |
226 | } |
229 | |
227 | |
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228 | void |
230 | void pkt_queue::expire_cb (ev::timer &w, int revents) |
229 | pkt_queue::expire_cb (ev::timer &w, int revents) |
231 | { |
230 | { |
232 | ev_tstamp expire = ev_now () - max_ttl; |
231 | ev_tstamp expire = ev_now () - max_ttl; |
233 | |
232 | |
234 | for (;;) |
233 | for (;;) |
235 | { |
234 | { |
… | |
… | |
246 | |
245 | |
247 | delete get (); |
246 | delete get (); |
248 | } |
247 | } |
249 | } |
248 | } |
250 | |
249 | |
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250 | void |
251 | void pkt_queue::put (net_packet *p) |
251 | pkt_queue::put (net_packet *p) |
252 | { |
252 | { |
253 | ev_tstamp now = ev_now (); |
253 | ev_tstamp now = ev_now (); |
254 | |
254 | |
255 | // start expiry timer |
255 | // start expiry timer |
256 | if (empty ()) |
256 | if (empty ()) |
… | |
… | |
265 | queue[i].tstamp = now; |
265 | queue[i].tstamp = now; |
266 | |
266 | |
267 | i = ni; |
267 | i = ni; |
268 | } |
268 | } |
269 | |
269 | |
270 | net_packet *pkt_queue::get () |
270 | net_packet * |
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271 | pkt_queue::get () |
271 | { |
272 | { |
272 | if (empty ()) |
273 | if (empty ()) |
273 | return 0; |
274 | return 0; |
274 | |
275 | |
275 | net_packet *p = queue[j].pkt; |
276 | net_packet *p = queue[j].pkt; |
… | |
… | |
299 | |
300 | |
300 | bool can (const sockinfo &si) { return can((u32)si.host); } |
301 | bool can (const sockinfo &si) { return can((u32)si.host); } |
301 | bool can (u32 host); |
302 | bool can (u32 host); |
302 | }; |
303 | }; |
303 | |
304 | |
304 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
305 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
305 | |
306 | |
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307 | bool |
306 | bool net_rate_limiter::can (u32 host) |
308 | net_rate_limiter::can (u32 host) |
307 | { |
309 | { |
308 | iterator i; |
310 | iterator i; |
309 | |
311 | |
310 | for (i = begin (); i != end (); ) |
312 | for (i = begin (); i != end (); ) |
311 | if (i->host == host) |
313 | if (i->host == host) |
… | |
… | |
356 | } |
358 | } |
357 | } |
359 | } |
358 | |
360 | |
359 | ///////////////////////////////////////////////////////////////////////////// |
361 | ///////////////////////////////////////////////////////////////////////////// |
360 | |
362 | |
361 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
363 | void |
362 | |
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363 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
364 | hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest) |
364 | { |
365 | { |
365 | unsigned int xlen; |
366 | ctx->hctx.init (); |
366 | |
367 | ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)); |
367 | HMAC_CTX *hctx = &ctx->hctx; |
368 | ctx->hctx.digest (hmac_digest); |
368 | |
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369 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
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370 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
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371 | len - sizeof (hmac_packet)); |
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372 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
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373 | } |
369 | } |
374 | |
370 | |
375 | void |
371 | void |
376 | hmac_packet::hmac_set (crypto_ctx *ctx) |
372 | hmac_packet::hmac_set (crypto_ctx *ctx) |
377 | { |
373 | { |
378 | hmac_gen (ctx); |
374 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
379 | |
375 | hmac_gen (ctx, hmac_digest); |
380 | memcpy (hmac, hmac_digest, HMACLENGTH); |
376 | memcpy (hmac, hmac_digest, HMACLENGTH); |
381 | } |
377 | } |
382 | |
378 | |
383 | bool |
379 | bool |
384 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
380 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
385 | { |
381 | { |
386 | hmac_gen (ctx); |
382 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
387 | |
383 | hmac_gen (ctx, hmac_digest); |
388 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
384 | return slow_memeq (hmac, hmac_digest, HMACLENGTH); |
389 | } |
385 | } |
390 | |
386 | |
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387 | void |
391 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
388 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
392 | { |
389 | { |
393 | type = type_; |
390 | type = type_; |
394 | |
391 | |
395 | int src = THISNODE->id; |
392 | int src = THISNODE->id; |
396 | |
393 | |
… | |
… | |
398 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
395 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
399 | dst1 = dst; |
396 | dst1 = dst; |
400 | } |
397 | } |
401 | |
398 | |
402 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
399 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
403 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
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404 | |
400 | |
405 | struct vpndata_packet : vpn_packet |
401 | struct vpndata_packet : vpn_packet |
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402 | { |
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403 | u32 ctr; // seqno |
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404 | u8 data[MAXVPNDATA]; |
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405 | |
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406 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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407 | tap_packet *unpack (connection *conn, u32 &seqno); |
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408 | |
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409 | private: |
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410 | const u32 data_hdr_size () const |
406 | { |
411 | { |
407 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
412 | // the distance from beginning of packet to data member |
408 | |
413 | return data - at (0); |
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; |
|
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416 | } |
|
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417 | }; |
414 | } |
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415 | }; |
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416 | |
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417 | // expands packet counter (unlike seqno, in network byte order) to counter mode IV |
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418 | static unsigned char * |
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419 | expand_iv (u32 ctr) |
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420 | { |
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421 | static u32 iv[IV_SIZE (CIPHER) / 4]; |
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422 | |
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423 | require (sizeof (iv) == 4 * 4); |
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424 | require (IV_SIZE (CIPHER) % 4 == 0); |
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425 | |
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426 | iv[0] = |
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427 | iv[1] = |
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428 | iv[2] = ctr; |
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429 | |
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430 | // I would reuse ctr here to to avoid potential endianness issues, |
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431 | // but it seems openssl wraps around. While this would be still ok, |
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432 | // and I don't even know if its true, let's play safe and initialise |
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433 | // to 0. |
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434 | iv[3] = 0; |
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435 | |
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436 | return (unsigned char *)iv; |
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437 | } |
418 | |
438 | |
419 | void |
439 | void |
420 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
440 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
421 | { |
441 | { |
422 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
442 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
… | |
… | |
424 | ptype type = PT_DATA_UNCOMPRESSED; |
444 | ptype type = PT_DATA_UNCOMPRESSED; |
425 | |
445 | |
426 | #if ENABLE_COMPRESSION |
446 | #if ENABLE_COMPRESSION |
427 | u8 cdata[MAX_MTU]; |
447 | u8 cdata[MAX_MTU]; |
428 | |
448 | |
429 | if (conn->features & ENABLE_COMPRESSION) |
449 | if (conn->features & FEATURE_COMPRESSION) |
430 | { |
450 | { |
431 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
451 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
432 | |
452 | |
433 | if (cl) |
453 | if (cl) |
434 | { |
454 | { |
… | |
… | |
440 | d[1] = cl; |
460 | d[1] = cl; |
441 | } |
461 | } |
442 | } |
462 | } |
443 | #endif |
463 | #endif |
444 | |
464 | |
|
|
465 | ctr = htonl (seqno); |
|
|
466 | |
445 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
467 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr))); |
446 | |
|
|
447 | struct { |
|
|
448 | #if RAND_SIZE |
|
|
449 | u8 rnd[RAND_SIZE]; |
|
|
450 | #endif |
|
|
451 | u32 seqno; |
|
|
452 | } datahdr; |
|
|
453 | |
|
|
454 | datahdr.seqno = ntohl (seqno); |
|
|
455 | #if RAND_SIZE |
|
|
456 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
|
|
457 | #endif |
|
|
458 | |
468 | |
459 | require (EVP_EncryptUpdate (cctx, |
469 | require (EVP_EncryptUpdate (cctx, |
460 | (unsigned char *) data + outl, &outl2, |
470 | (unsigned char *)data + outl, &outl2, |
461 | (unsigned char *) &datahdr, DATAHDR)); |
471 | (unsigned char *)d, l)); |
462 | outl += outl2; |
472 | outl += outl2; |
463 | |
473 | |
464 | require (EVP_EncryptUpdate (cctx, |
474 | // it seems this is a nop for us, but we do it anyways |
465 | (unsigned char *) data + outl, &outl2, |
475 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2)); |
466 | (unsigned char *) d, l)); |
|
|
467 | outl += outl2; |
476 | outl += outl2; |
468 | |
477 | |
469 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
|
|
470 | outl += outl2; |
|
|
471 | |
|
|
472 | len = outl + data_hdr_size (); |
478 | len = data_hdr_size () + outl; |
473 | |
479 | |
474 | set_hdr (type, dst); |
480 | set_hdr (type, dst); |
475 | |
481 | |
476 | hmac_set (conn->octx); |
482 | hmac_set (conn->octx); |
477 | } |
483 | } |
… | |
… | |
481 | { |
487 | { |
482 | EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
488 | EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
483 | int outl = 0, outl2; |
489 | int outl = 0, outl2; |
484 | tap_packet *p = new tap_packet; |
490 | tap_packet *p = new tap_packet; |
485 | u8 *d; |
491 | u8 *d; |
486 | u32 l = len - data_hdr_size (); |
|
|
487 | |
492 | |
|
|
493 | seqno = ntohl (ctr); |
|
|
494 | |
488 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
495 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr))); |
489 | |
496 | |
490 | #if ENABLE_COMPRESSION |
497 | #if ENABLE_COMPRESSION |
491 | u8 cdata[MAX_MTU]; |
498 | u8 cdata[MAX_MTU]; |
492 | |
499 | |
493 | if (type == PT_DATA_COMPRESSED) |
500 | if (type == PT_DATA_COMPRESSED) |
494 | d = cdata; |
501 | d = cdata; |
495 | else |
502 | else |
496 | #endif |
503 | #endif |
497 | d = &(*p)[6 + 6 - DATAHDR]; |
504 | d = &(*p)[6 + 6]; |
498 | |
505 | |
499 | /* this overwrites part of the src mac, but we fix that later */ |
506 | // this can overwrite the len/dst/src fields |
500 | require (EVP_DecryptUpdate (cctx, |
507 | require (EVP_DecryptUpdate (cctx, |
501 | d, &outl2, |
508 | d, &outl2, |
502 | (unsigned char *)&data, len - data_hdr_size ())); |
509 | (unsigned char *)&data, len - data_hdr_size ())); |
503 | outl += outl2; |
510 | outl += outl2; |
504 | |
511 | |
|
|
512 | // it seems this is a nop for us, but we do it anyways |
505 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
513 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
506 | outl += outl2; |
514 | outl += outl2; |
507 | |
515 | |
508 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
|
|
509 | |
|
|
510 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
516 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
511 | id2mac (src (), p->src); |
517 | id2mac (src (), p->src); |
512 | |
518 | |
513 | #if ENABLE_COMPRESSION |
519 | #if ENABLE_COMPRESSION |
514 | if (type == PT_DATA_COMPRESSED) |
520 | if (type == PT_DATA_COMPRESSED) |
515 | { |
521 | { |
516 | u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
522 | u32 cl = (d[0] << 8) | d[1]; |
517 | |
523 | |
518 | p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0, |
524 | p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0, |
519 | &(*p)[6 + 6], MAX_MTU) |
525 | &(*p)[6 + 6], MAX_MTU) |
520 | + 6 + 6; |
526 | + 6 + 6; |
521 | } |
527 | } |
522 | else |
528 | else |
523 | p->len = outl + (6 + 6 - DATAHDR); |
529 | p->len = outl + (6 + 6); |
524 | #endif |
530 | #endif |
525 | |
531 | |
526 | return p; |
532 | return p; |
527 | } |
533 | } |
528 | |
534 | |
… | |
… | |
535 | } |
541 | } |
536 | }; |
542 | }; |
537 | |
543 | |
538 | struct config_packet : vpn_packet |
544 | struct config_packet : vpn_packet |
539 | { |
545 | { |
540 | // actually, hmaclen cannot be checked because the hmac |
546 | 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; |
547 | u8 prot_major, prot_minor, randsize; |
544 | u8 flags, challengelen, features, pad3; |
548 | u8 flags, features, pad6, pad7, pad8; |
545 | u32 cipher_nid, digest_nid, hmac_nid; |
549 | u32 cipher_nid, mac_nid, auth_nid; |
546 | |
550 | |
547 | void setup (ptype type, int dst); |
551 | void setup (ptype type, int dst); |
548 | bool chk_config () const; |
552 | bool chk_config (const conf_node *conf, const sockinfo &rsi) const; |
549 | |
553 | |
550 | static u8 get_features () |
554 | static u8 get_features () |
551 | { |
555 | { |
552 | u8 f = 0; |
556 | u8 f = 0; |
553 | #if ENABLE_COMPRESSION |
557 | #if ENABLE_COMPRESSION |
… | |
… | |
561 | #endif |
565 | #endif |
562 | return f; |
566 | return f; |
563 | } |
567 | } |
564 | }; |
568 | }; |
565 | |
569 | |
|
|
570 | void |
566 | void config_packet::setup (ptype type, int dst) |
571 | config_packet::setup (ptype type, int dst) |
567 | { |
572 | { |
568 | prot_major = PROTOCOL_MAJOR; |
573 | prot_major = PROTOCOL_MAJOR; |
569 | prot_minor = PROTOCOL_MINOR; |
574 | prot_minor = PROTOCOL_MINOR; |
570 | randsize = RAND_SIZE; |
|
|
571 | hmaclen = HMACLENGTH; |
|
|
572 | flags = 0; |
575 | flags = 0; |
573 | challengelen = sizeof (rsachallenge); |
|
|
574 | features = get_features (); |
576 | features = get_features (); |
575 | |
577 | |
|
|
578 | strncpy ((char *)serial, conf.serial, sizeof (serial)); |
|
|
579 | |
576 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
580 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); |
577 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
|
|
578 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
581 | mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); |
|
|
582 | auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); |
579 | |
583 | |
580 | len = sizeof (*this) - sizeof (net_packet); |
584 | len = sizeof (*this) - sizeof (net_packet); |
581 | set_hdr (type, dst); |
585 | set_hdr (type, dst); |
582 | } |
586 | } |
583 | |
587 | |
584 | bool config_packet::chk_config () const |
588 | bool |
|
|
589 | config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const |
585 | { |
590 | { |
586 | if (prot_major != PROTOCOL_MAJOR) |
591 | if (prot_major != PROTOCOL_MAJOR) |
587 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
592 | slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"), |
588 | else if (randsize != RAND_SIZE) |
593 | conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR); |
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); |
|
|
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))) |
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)); |
595 | slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"), |
596 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
596 | 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))) |
597 | 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)); |
598 | slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"), |
|
|
599 | conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); |
|
|
600 | else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) |
|
|
601 | slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"), |
|
|
602 | conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); |
600 | else |
603 | else |
|
|
604 | { |
|
|
605 | int cmp = memcmp (serial, ::conf.serial, sizeof (serial)); |
|
|
606 | |
|
|
607 | if (cmp > 0) |
|
|
608 | slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"), |
|
|
609 | conf->nodename, (const char *)rsi); |
|
|
610 | else if (cmp == 0) |
601 | return true; |
611 | return true; |
|
|
612 | } |
602 | |
613 | |
603 | return false; |
614 | return false; |
604 | } |
615 | } |
605 | |
616 | |
606 | struct auth_req_packet : config_packet |
617 | struct auth_req_packet : config_packet // UNPROTECTED |
607 | { |
618 | { |
608 | char magic[8]; |
619 | char magic[8]; |
609 | u8 initiate; // false if this is just an automatic reply |
620 | u8 initiate; // false if this is just an automatic reply |
610 | u8 protocols; // supported protocols (will be patched on forward) |
621 | u8 protocols; // supported protocols (will be patched on forward) |
611 | u8 pad2, pad3; |
622 | u8 pad2, pad3; |
612 | rsaid id; |
623 | auth_encr encr; |
613 | rsaencrdata encr; |
|
|
614 | |
624 | |
615 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
625 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
616 | { |
626 | { |
617 | config_packet::setup (PT_AUTH_REQ, dst); |
627 | config_packet::setup (PT_AUTH_REQ, dst); |
618 | strncpy (magic, MAGIC, 8); |
628 | memcpy (magic, MAGIC, 8); |
619 | initiate = !!initiate_; |
629 | initiate = !!initiate_; |
620 | protocols = protocols_; |
630 | protocols = protocols_; |
621 | |
631 | |
622 | len = sizeof (*this) - sizeof (net_packet); |
632 | len = sizeof (*this) - sizeof (net_packet); |
623 | } |
633 | } |
624 | }; |
634 | }; |
625 | |
635 | |
626 | struct auth_res_packet : config_packet |
636 | struct auth_res_packet : vpn_packet // UNPROTECTED |
627 | { |
637 | { |
628 | rsaid id; |
|
|
629 | u8 pad1, pad2, pad3; |
|
|
630 | u8 response_len; // encrypted length |
|
|
631 | rsaresponse response; |
638 | auth_response response; |
632 | |
639 | |
633 | auth_res_packet (int dst) |
640 | auth_res_packet (int dst) |
634 | { |
641 | { |
635 | config_packet::setup (PT_AUTH_RES, dst); |
642 | set_hdr (PT_AUTH_RES, dst); |
636 | |
643 | |
637 | len = sizeof (*this) - sizeof (net_packet); |
644 | len = sizeof (*this) - sizeof (net_packet); |
638 | } |
645 | } |
639 | }; |
646 | }; |
640 | |
647 | |
… | |
… | |
670 | }; |
677 | }; |
671 | |
678 | |
672 | ///////////////////////////////////////////////////////////////////////////// |
679 | ///////////////////////////////////////////////////////////////////////////// |
673 | |
680 | |
674 | void |
681 | void |
675 | connection::connection_established () |
682 | connection::connection_established (const sockinfo &rsi) |
676 | { |
683 | { |
677 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
684 | if (!have_snd_auth || !have_rcv_auth) |
|
|
685 | return; |
678 | |
686 | |
679 | if (ictx && octx) |
687 | si = rsi; |
|
|
688 | protocol = rsi.prot; |
|
|
689 | |
|
|
690 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
691 | conf->nodename, (const char *)rsi, |
|
|
692 | vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded", |
|
|
693 | PROTOCOL_MAJOR, prot_minor); |
|
|
694 | |
|
|
695 | if (::conf.script_node_up) |
|
|
696 | { |
|
|
697 | run_script_cb *cb = new run_script_cb; |
|
|
698 | cb->set<connection, &connection::script_node_up> (this); |
|
|
699 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
680 | { |
700 | } |
|
|
701 | |
|
|
702 | delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0); |
|
|
703 | iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); |
|
|
704 | |
|
|
705 | delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); |
|
|
706 | oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; |
|
|
707 | |
681 | // make sure rekeying timeouts are slightly asymmetric |
708 | // make sure rekeying timeouts are slightly asymmetric |
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
709 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
683 | rekey.start (rekey_interval, rekey_interval); |
710 | rekey.start (rekey_interval, rekey_interval); |
|
|
711 | |
|
|
712 | hmac_error = 0.; |
|
|
713 | |
684 | keepalive.start (::conf.keepalive); |
714 | keepalive.start (::conf.keepalive); |
685 | |
715 | |
686 | // send queued packets |
716 | // send queued packets |
687 | if (ictx && octx) |
|
|
688 | { |
|
|
689 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
717 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
690 | { |
718 | { |
691 | if (p->len) send_data_packet (p); |
719 | if (p->len) send_data_packet (p); |
692 | delete p; |
720 | delete p; |
693 | } |
721 | } |
694 | |
722 | |
695 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
723 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
696 | { |
724 | { |
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
725 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
698 | delete p; |
726 | delete p; |
699 | } |
727 | } |
700 | } |
|
|
701 | |
728 | |
702 | vpn->connection_established (this); |
729 | vpn->connection_established (this); |
703 | } |
|
|
704 | else |
|
|
705 | { |
|
|
706 | retry_cnt = 0; |
|
|
707 | establish_connection.start (5); |
|
|
708 | keepalive.stop (); |
|
|
709 | rekey.stop (); |
|
|
710 | } |
|
|
711 | } |
730 | } |
712 | |
731 | |
713 | void |
732 | void |
714 | connection::reset_si () |
733 | connection::reset_si () |
715 | { |
734 | { |
… | |
… | |
720 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
739 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
721 | protocol = 0; |
740 | protocol = 0; |
722 | } |
741 | } |
723 | |
742 | |
724 | si.set (conf, protocol); |
743 | si.set (conf, protocol); |
725 | |
|
|
726 | is_direct = si.valid (); |
|
|
727 | } |
744 | } |
728 | |
745 | |
729 | // ensure sockinfo is valid, forward if necessary |
746 | // ensure sockinfo is valid, forward if necessary |
730 | const sockinfo & |
747 | const sockinfo & |
731 | connection::forward_si (const sockinfo &si) const |
748 | connection::forward_si (const sockinfo &si) const |
… | |
… | |
750 | |
767 | |
751 | void |
768 | void |
752 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
769 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
753 | { |
770 | { |
754 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
771 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
755 | reset_connection (); |
772 | reset_connection ("packet send error"); |
756 | } |
773 | } |
757 | |
774 | |
758 | void |
775 | void |
759 | connection::send_ping (const sockinfo &si, u8 pong) |
776 | connection::send_ping (const sockinfo &si, u8 pong) |
760 | { |
777 | { |
761 | ping_packet *pkt = new ping_packet; |
778 | ping_packet *pkt = new ping_packet; |
762 | |
779 | |
763 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
780 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
764 | |
781 | |
765 | slog (L_TRACE, ">>%d %s [%s]", conf->id, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
782 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
766 | |
|
|
767 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
783 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
768 | |
784 | |
769 | delete pkt; |
785 | delete pkt; |
770 | } |
786 | } |
771 | |
787 | |
… | |
… | |
786 | void |
802 | void |
787 | connection::send_auth_request (const sockinfo &si, bool initiate) |
803 | connection::send_auth_request (const sockinfo &si, bool initiate) |
788 | { |
804 | { |
789 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
805 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
790 | |
806 | |
791 | rsachallenge chg; |
807 | generate_auth_data (); |
792 | rsa_cache.gen (pkt->id, chg); |
|
|
793 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
808 | auth_encrypt (conf->rsa_key, snd_auth, pkt->encr); |
794 | |
809 | |
795 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
810 | 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 |
811 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
798 | |
812 | |
799 | delete pkt; |
813 | delete pkt; |
800 | } |
814 | } |
801 | |
815 | |
802 | void |
816 | void |
803 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
817 | connection::send_auth_response (const sockinfo &si) |
804 | { |
818 | { |
805 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
819 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
806 | |
820 | |
807 | pkt->id = id; |
821 | memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b); |
|
|
822 | auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac); |
808 | |
823 | |
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); |
824 | 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 |
825 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
816 | |
826 | |
817 | delete pkt; |
827 | delete pkt; |
818 | } |
828 | } |
819 | |
829 | |
820 | void |
830 | void |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
831 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
822 | { |
832 | { |
823 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
833 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
824 | conf->id, rid, (const char *)rsi); |
834 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
835 | conf->protocols); |
825 | |
836 | |
826 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
837 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
827 | |
838 | |
828 | r->hmac_set (octx); |
839 | r->hmac_set (octx); |
829 | send_vpn_packet (r, si); |
840 | send_vpn_packet (r, si); |
… | |
… | |
832 | } |
843 | } |
833 | |
844 | |
834 | inline void |
845 | inline void |
835 | connection::establish_connection_cb (ev::timer &w, int revents) |
846 | connection::establish_connection_cb (ev::timer &w, int revents) |
836 | { |
847 | { |
837 | if (!ictx |
848 | if (!(ictx && octx) |
838 | && conf != THISNODE |
849 | && conf != THISNODE |
839 | && connectmode != conf_node::C_NEVER |
850 | && connectmode != conf_node::C_NEVER |
840 | && connectmode != conf_node::C_DISABLED |
851 | && connectmode != conf_node::C_DISABLED |
841 | && !w.is_active ()) |
852 | && !w.is_active ()) |
842 | { |
853 | { |
843 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
854 | // 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. |
855 | // 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 ()) |
856 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
846 | { |
857 | { |
847 | reset_connection (); |
858 | reset_connection ("no demand"); |
848 | return; |
859 | return; |
849 | } |
860 | } |
850 | |
861 | |
851 | last_establish_attempt = ev_now (); |
862 | last_establish_attempt = ev_now (); |
852 | |
863 | |
… | |
… | |
854 | ? (retry_cnt & 3) + 1 |
865 | ? (retry_cnt & 3) + 1 |
855 | : 1 << (retry_cnt >> 2)); |
866 | : 1 << (retry_cnt >> 2)); |
856 | |
867 | |
857 | reset_si (); |
868 | reset_si (); |
858 | |
869 | |
859 | bool slow = si.prot & PROT_SLOW; |
870 | bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power); |
860 | |
871 | |
861 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
872 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
862 | { |
873 | { |
863 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
874 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
864 | w.start (1); |
875 | w.start (1); |
865 | vpn->send_connect_request (conf->id); |
876 | vpn->send_connect_request (this); |
866 | } |
877 | } |
867 | else |
878 | else |
868 | { |
879 | { |
869 | if (si.valid ()) |
880 | if (si.valid ()) |
870 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
881 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
… | |
… | |
874 | |
885 | |
875 | slow = slow || (dsi.prot & PROT_SLOW); |
886 | slow = slow || (dsi.prot & PROT_SLOW); |
876 | |
887 | |
877 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
888 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
878 | { |
889 | { |
879 | if (retry_cnt < 4) |
890 | // use ping after the first few retries |
|
|
891 | // TODO: on rekeys, the other node might not interpret ping correctly, |
|
|
892 | // TODO: as it will still have a valid connection |
|
|
893 | if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power)) |
880 | send_auth_request (dsi, true); |
894 | send_auth_request (dsi, true); |
881 | else |
895 | else |
882 | send_ping (dsi, 0); |
896 | send_ping (dsi, 0); |
883 | } |
897 | } |
884 | } |
898 | } |
885 | |
899 | |
886 | retry_int *= slow ? 8. : 0.9; |
900 | retry_int *= slow ? 4. : 0.9; |
887 | |
901 | |
888 | if (retry_int < conf->max_retry) |
902 | if (retry_int < conf->max_retry) |
889 | retry_cnt++; |
903 | retry_cnt++; |
890 | else |
904 | else |
891 | retry_int = conf->max_retry; |
905 | retry_int = conf->max_retry; |
… | |
… | |
893 | w.start (retry_int); |
907 | w.start (retry_int); |
894 | } |
908 | } |
895 | } |
909 | } |
896 | |
910 | |
897 | void |
911 | void |
898 | connection::reset_connection () |
912 | connection::reset_connection (const char *reason) |
899 | { |
913 | { |
900 | if (ictx && octx) |
914 | if (ictx && octx) |
901 | { |
915 | { |
902 | slog (L_INFO, _("%s(%s): connection lost"), |
916 | slog (L_INFO, _("%s(%s): connection lost (%s)"), |
903 | conf->nodename, (const char *)si); |
917 | conf->nodename, (const char *)si, reason); |
904 | |
918 | |
905 | if (::conf.script_node_down) |
919 | if (::conf.script_node_down) |
906 | { |
920 | { |
907 | run_script_cb *cb = new run_script_cb; |
921 | run_script_cb *cb = new run_script_cb; |
908 | cb->set<connection, &connection::script_node_down> (this); |
922 | cb->set<connection, &connection::script_node_down> (this); |
… | |
… | |
910 | } |
924 | } |
911 | } |
925 | } |
912 | |
926 | |
913 | delete ictx; ictx = 0; |
927 | delete ictx; ictx = 0; |
914 | delete octx; octx = 0; |
928 | delete octx; octx = 0; |
915 | #if ENABLE_DNS |
|
|
916 | dnsv4_reset_connection (); |
|
|
917 | #endif |
|
|
918 | |
929 | |
919 | si.host = 0; |
930 | si.host = 0; |
|
|
931 | |
|
|
932 | have_snd_auth = false; |
|
|
933 | have_rcv_auth = false; |
|
|
934 | auth_expire = 0.; |
920 | |
935 | |
921 | last_activity = 0.; |
936 | last_activity = 0.; |
922 | //last_si_change = 0.; |
937 | //last_si_change = 0.; |
923 | retry_cnt = 0; |
938 | retry_cnt = 0; |
924 | |
939 | |
… | |
… | |
931 | connection::shutdown () |
946 | connection::shutdown () |
932 | { |
947 | { |
933 | if (ictx && octx) |
948 | if (ictx && octx) |
934 | send_reset (si); |
949 | send_reset (si); |
935 | |
950 | |
936 | reset_connection (); |
951 | reset_connection ("shutdown"); |
937 | } |
952 | } |
938 | |
953 | |
939 | // poor-man's rekeying |
954 | // poor-man's rekeying |
940 | inline void |
955 | inline void |
941 | connection::rekey_cb (ev::timer &w, int revents) |
956 | connection::rekey_cb (ev::timer &w, int revents) |
942 | { |
957 | { |
943 | reset_connection (); |
958 | reset_connection ("rekeying"); |
944 | establish_connection (); |
959 | establish_connection (); |
945 | } |
960 | } |
946 | |
961 | |
947 | void |
962 | void |
948 | connection::send_data_packet (tap_packet *pkt) |
963 | connection::send_data_packet (tap_packet *pkt) |
… | |
… | |
965 | |
980 | |
966 | void |
981 | void |
967 | connection::post_inject_queue () |
982 | connection::post_inject_queue () |
968 | { |
983 | { |
969 | // force a connection every now and when when packets are sent (max 1/s) |
984 | // force a connection every now and when when packets are sent (max 1/s) |
970 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
985 | if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary |
971 | establish_connection.stop (); |
986 | establish_connection.stop (); |
972 | |
987 | |
973 | establish_connection (); |
988 | establish_connection (); |
974 | } |
989 | } |
975 | |
990 | |
… | |
… | |
983 | data_queue.put (new tap_packet (*pkt)); |
998 | data_queue.put (new tap_packet (*pkt)); |
984 | post_inject_queue (); |
999 | post_inject_queue (); |
985 | } |
1000 | } |
986 | } |
1001 | } |
987 | |
1002 | |
|
|
1003 | void |
988 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1004 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
989 | { |
1005 | { |
990 | if (ictx && octx) |
1006 | if (ictx && octx) |
991 | send_vpn_packet (pkt, si, tos); |
1007 | send_vpn_packet (pkt, si, tos); |
992 | else |
1008 | else |
993 | { |
1009 | { |
… | |
… | |
999 | void |
1015 | void |
1000 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1016 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1001 | { |
1017 | { |
1002 | last_activity = ev_now (); |
1018 | last_activity = ev_now (); |
1003 | |
1019 | |
1004 | slog (L_NOISE, "<<%d received packet type %d from %d to %d.", |
1020 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
1005 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1021 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
1006 | |
1022 | |
1007 | if (connectmode == conf_node::C_DISABLED) |
1023 | if (connectmode == conf_node::C_DISABLED) |
1008 | return; |
1024 | return; |
1009 | |
1025 | |
1010 | switch (pkt->typ ()) |
1026 | switch (pkt->typ ()) |
1011 | { |
1027 | { |
1012 | case vpn_packet::PT_PING: |
1028 | case vpn_packet::PT_PING: |
|
|
1029 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1030 | |
1013 | // we send pings instead of auth packets after some retries, |
1031 | // we send pings instead of auth packets after some retries, |
1014 | // so reset the retry counter and establish a connection |
1032 | // so reset the retry counter and establish a connection |
1015 | // when we receive a ping. |
1033 | // when we receive a ping. |
1016 | if (!ictx) |
1034 | if (!ictx) |
1017 | { |
1035 | { |
1018 | if (auth_rate_limiter.can (rsi)) |
1036 | if (auth_rate_limiter.can (rsi)) |
1019 | send_auth_request (rsi, true); |
1037 | send_auth_request (rsi, true); |
1020 | } |
1038 | } |
1021 | else |
1039 | else |
1022 | // we would love to change thre socket address here, but ping's aren't |
1040 | // we would love to change the socket address here, but ping's aren't |
1023 | // authenticated, so we best ignore it. |
1041 | // authenticated, so we best ignore it. |
1024 | send_ping (rsi, 1); // pong |
1042 | send_ping (rsi, 1); // pong |
1025 | |
1043 | |
1026 | break; |
1044 | break; |
1027 | |
1045 | |
1028 | case vpn_packet::PT_PONG: |
1046 | case vpn_packet::PT_PONG: |
|
|
1047 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1048 | |
|
|
1049 | // a PONG might mean that the other side doesn't really know |
|
|
1050 | // about our desire for communication. |
|
|
1051 | establish_connection (); |
1029 | break; |
1052 | break; |
1030 | |
1053 | |
1031 | case vpn_packet::PT_RESET: |
1054 | case vpn_packet::PT_RESET: |
|
|
1055 | slog (L_TRACE, "%s >> PT_RESET", conf->nodename); |
|
|
1056 | |
|
|
1057 | if (ictx && octx) |
1032 | { |
1058 | { |
1033 | reset_connection (); |
1059 | reset_connection ("remote reset"); |
1034 | |
1060 | |
1035 | config_packet *p = (config_packet *) pkt; |
1061 | config_packet *p = (config_packet *) pkt; |
1036 | |
1062 | |
1037 | if (!p->chk_config ()) |
1063 | if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS) |
1038 | { |
|
|
1039 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
|
|
1040 | conf->nodename, (const char *)rsi); |
|
|
1041 | connectmode = conf_node::C_DISABLED; |
|
|
1042 | } |
|
|
1043 | else if (connectmode == conf_node::C_ALWAYS) |
|
|
1044 | establish_connection (); |
1064 | establish_connection (); |
1045 | } |
1065 | } |
|
|
1066 | |
1046 | break; |
1067 | break; |
1047 | |
1068 | |
1048 | case vpn_packet::PT_AUTH_REQ: |
1069 | case vpn_packet::PT_AUTH_REQ: |
1049 | if (auth_rate_limiter.can (rsi)) |
1070 | if (auth_rate_limiter.can (rsi)) |
1050 | { |
1071 | { |
1051 | auth_req_packet *p = (auth_req_packet *) pkt; |
1072 | auth_req_packet *p = (auth_req_packet *)pkt; |
1052 | |
1073 | |
1053 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1074 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1075 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1076 | p->protocols, p->features); |
1054 | |
1077 | |
1055 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1078 | if (memcmp (p->magic, MAGIC, 8)) |
|
|
1079 | { |
|
|
1080 | slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"), |
|
|
1081 | conf->nodename, (const char *)rsi); |
|
|
1082 | } |
|
|
1083 | else if (p->chk_config (conf, rsi)) |
1056 | { |
1084 | { |
1057 | if (p->prot_minor != PROTOCOL_MINOR) |
1085 | if (p->prot_minor != PROTOCOL_MINOR) |
1058 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1086 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1059 | conf->nodename, (const char *)rsi, |
1087 | conf->nodename, (const char *)rsi, |
1060 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1088 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1061 | |
1089 | |
1062 | if (p->initiate) |
1090 | if (p->initiate) |
|
|
1091 | { |
1063 | send_auth_request (rsi, false); |
1092 | send_auth_request (rsi, false); |
1064 | |
1093 | |
1065 | rsachallenge k; |
1094 | if (ictx && octx) |
|
|
1095 | reset_connection ("reconnect"); |
|
|
1096 | } |
1066 | |
1097 | |
|
|
1098 | auth_data auth; |
|
|
1099 | |
1067 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
1100 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
1068 | { |
1101 | { |
1069 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1102 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1070 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1103 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1071 | break; |
|
|
1072 | } |
1104 | } |
1073 | else |
1105 | else |
1074 | { |
1106 | { |
1075 | delete octx; |
1107 | bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth); |
1076 | |
1108 | |
1077 | octx = new crypto_ctx (k, 1); |
1109 | rcv_auth = auth; |
1078 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1110 | have_rcv_auth = true; |
1079 | |
1111 | |
|
|
1112 | send_auth_response (rsi); |
|
|
1113 | |
|
|
1114 | if (chg) |
|
|
1115 | { |
1080 | conf->protocols = p->protocols; |
1116 | conf->protocols = p->protocols; |
1081 | features = p->features & config_packet::get_features (); |
1117 | features = p->features & config_packet::get_features (); |
1082 | |
1118 | |
1083 | send_auth_response (rsi, p->id, k); |
|
|
1084 | |
|
|
1085 | connection_established (); |
1119 | connection_established (rsi); |
1086 | |
|
|
1087 | break; |
1120 | } |
1088 | } |
1121 | } |
|
|
1122 | |
|
|
1123 | break; |
1089 | } |
1124 | } |
1090 | else |
|
|
1091 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
|
|
1092 | conf->nodename, (const char *)rsi); |
|
|
1093 | |
1125 | |
1094 | send_reset (rsi); |
1126 | send_reset (rsi); |
1095 | } |
1127 | } |
1096 | |
1128 | |
1097 | break; |
1129 | break; |
1098 | |
1130 | |
1099 | case vpn_packet::PT_AUTH_RES: |
1131 | case vpn_packet::PT_AUTH_RES: |
1100 | { |
1132 | { |
1101 | auth_res_packet *p = (auth_res_packet *) pkt; |
1133 | auth_res_packet *p = (auth_res_packet *)pkt; |
1102 | |
1134 | |
1103 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1135 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
1104 | |
1136 | |
1105 | if (p->chk_config ()) |
1137 | auth_mac local_mac; |
|
|
1138 | auth_hash (snd_auth, p->response.ecdh, local_mac); |
|
|
1139 | |
|
|
1140 | if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac)) |
1106 | { |
1141 | { |
1107 | if (p->prot_minor != PROTOCOL_MINOR) |
|
|
1108 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
1109 | conf->nodename, (const char *)rsi, |
|
|
1110 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
1111 | |
|
|
1112 | rsachallenge chg; |
|
|
1113 | |
|
|
1114 | if (!rsa_cache.find (p->id, chg)) |
|
|
1115 | { |
|
|
1116 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
1142 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
1117 | conf->nodename, (const char *)rsi); |
1143 | conf->nodename, (const char *)rsi); |
1118 | break; |
|
|
1119 | } |
1144 | } |
1120 | else |
1145 | else if (!have_snd_auth) |
1121 | { |
1146 | { |
1122 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1147 | memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b); |
1123 | |
1148 | |
1124 | if (!p->hmac_chk (cctx)) |
1149 | have_snd_auth = true; |
1125 | { |
|
|
1126 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
1127 | "could be an attack, or just corruption or a synchronization error."), |
|
|
1128 | conf->nodename, (const char *)rsi); |
|
|
1129 | break; |
|
|
1130 | } |
|
|
1131 | else |
|
|
1132 | { |
|
|
1133 | rsaresponse h; |
|
|
1134 | |
|
|
1135 | rsa_hash (p->id, chg, h); |
|
|
1136 | |
|
|
1137 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
1138 | { |
|
|
1139 | prot_minor = p->prot_minor; |
|
|
1140 | |
|
|
1141 | delete ictx; ictx = cctx; |
|
|
1142 | |
|
|
1143 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
1144 | |
|
|
1145 | si = rsi; |
|
|
1146 | protocol = rsi.prot; |
|
|
1147 | |
|
|
1148 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d."), |
|
|
1149 | conf->nodename, (const char *)rsi, |
|
|
1150 | p->prot_major, p->prot_minor); |
|
|
1151 | |
|
|
1152 | connection_established (); |
1150 | connection_established (rsi); |
1153 | |
|
|
1154 | if (::conf.script_node_up) |
|
|
1155 | { |
|
|
1156 | run_script_cb *cb = new run_script_cb; |
|
|
1157 | cb->set<connection, &connection::script_node_up> (this); |
|
|
1158 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
1159 | } |
|
|
1160 | |
|
|
1161 | break; |
|
|
1162 | } |
|
|
1163 | else |
|
|
1164 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
|
|
1165 | conf->nodename, (const char *)rsi); |
|
|
1166 | } |
|
|
1167 | |
|
|
1168 | delete cctx; |
|
|
1169 | } |
|
|
1170 | } |
1151 | } |
1171 | } |
1152 | } |
1172 | |
|
|
1173 | send_reset (rsi); |
|
|
1174 | break; |
1153 | break; |
1175 | |
1154 | |
1176 | case vpn_packet::PT_DATA_COMPRESSED: |
1155 | case vpn_packet::PT_DATA_COMPRESSED: |
1177 | #if !ENABLE_COMPRESSION |
1156 | #if !ENABLE_COMPRESSION |
1178 | send_reset (rsi); |
1157 | send_reset (rsi); |
… | |
… | |
1184 | if (ictx && octx) |
1163 | if (ictx && octx) |
1185 | { |
1164 | { |
1186 | vpndata_packet *p = (vpndata_packet *)pkt; |
1165 | vpndata_packet *p = (vpndata_packet *)pkt; |
1187 | |
1166 | |
1188 | if (!p->hmac_chk (ictx)) |
1167 | if (!p->hmac_chk (ictx)) |
|
|
1168 | { |
|
|
1169 | // rekeying often creates temporary hmac auth floods |
|
|
1170 | // we assume they don't take longer than a few seconds normally, |
|
|
1171 | // and suppress messages and resets during that time. |
|
|
1172 | //TODO: should be done per source address |
|
|
1173 | if (!hmac_error) |
|
|
1174 | { |
|
|
1175 | hmac_error = ev_now () + 3; |
|
|
1176 | break; |
|
|
1177 | } |
|
|
1178 | else if (hmac_error >= ev_now ()) |
|
|
1179 | break; // silently suppress |
|
|
1180 | else |
|
|
1181 | { |
1189 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1182 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1190 | "could be an attack, or just corruption or a synchronization error."), |
1183 | "could be an attack, or just corruption or a synchronization error."), |
1191 | conf->nodename, (const char *)rsi); |
1184 | conf->nodename, (const char *)rsi); |
|
|
1185 | // reset |
|
|
1186 | } |
|
|
1187 | } |
1192 | else |
1188 | else |
1193 | { |
1189 | { |
1194 | u32 seqno; |
1190 | u32 seqno; |
1195 | tap_packet *d = p->unpack (this, seqno); |
1191 | tap_packet *d = p->unpack (this, seqno); |
1196 | int seqclass = iseqno.seqno_classify (seqno); |
1192 | int seqclass = iseqno.seqno_classify (seqno); |
1197 | |
1193 | |
|
|
1194 | hmac_error = 0; |
|
|
1195 | |
1198 | if (seqclass == 0) // ok |
1196 | if (seqclass == 0) // ok |
1199 | { |
1197 | { |
1200 | vpn->tap->send (d); |
1198 | vpn->tap->send (d); |
1201 | |
1199 | |
1202 | if (si != rsi) |
1200 | if (si != rsi) |
1203 | { |
1201 | { |
1204 | // fast re-sync on source address changes, useful especially for tcp/ip |
1202 | // fast re-sync on source address changes, useful especially for tcp/ip |
1205 | //if (last_si_change < ev_now () + 5.) |
1203 | //if (last_si_change < ev_now () + 5.) |
1206 | // { |
1204 | // { |
|
|
1205 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
|
|
1206 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1207 | |
1207 | si = rsi; |
1208 | si = rsi; |
1208 | |
1209 | |
1209 | slog (L_INFO, _("%s(%s): socket address changed to %s."), |
1210 | if (::conf.script_node_change) |
1210 | conf->nodename, (const char *)si, (const char *)rsi); |
1211 | { |
|
|
1212 | run_script_cb *cb = new run_script_cb; |
|
|
1213 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1214 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1215 | } |
|
|
1216 | |
1211 | // } |
1217 | // } |
1212 | //else |
1218 | //else |
1213 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
1219 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
1214 | // conf->nodename, (const char *)si, (const char *)rsi); |
1220 | // conf->nodename, (const char *)si, (const char *)rsi); |
1215 | } |
1221 | } |
1216 | } |
1222 | } |
1217 | else if (seqclass == 1) // silently ignore |
1223 | else if (seqclass == 1) // far history |
|
|
1224 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1225 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1226 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
1218 | slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
1227 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
1219 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
1228 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
1220 | else if (seqclass == 2) // reset |
1229 | else if (seqclass == 3) // reset |
1221 | { |
1230 | { |
1222 | slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
1231 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
1223 | "possible replay attack, or just massive packet loss, resetting connection."), seqno, iseqno.seq + 1); |
1232 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
1224 | send_reset (rsi); |
1233 | send_reset (rsi); |
1225 | } |
1234 | } |
1226 | |
1235 | |
1227 | delete d; |
1236 | delete d; |
1228 | break; |
1237 | break; |
… | |
… | |
1233 | break; |
1242 | break; |
1234 | |
1243 | |
1235 | case vpn_packet::PT_CONNECT_REQ: |
1244 | case vpn_packet::PT_CONNECT_REQ: |
1236 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1245 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1237 | { |
1246 | { |
1238 | connect_req_packet *p = (connect_req_packet *) pkt; |
1247 | connect_req_packet *p = (connect_req_packet *)pkt; |
1239 | |
1248 | |
1240 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1249 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1241 | { |
1250 | { |
1242 | connection *c = vpn->conns[p->id - 1]; |
1251 | connection *c = vpn->conns[p->id - 1]; |
1243 | conf->protocols = p->protocols; |
1252 | conf->protocols = p->protocols; |
1244 | |
1253 | |
1245 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
1254 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1255 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1256 | p->protocols, |
1246 | conf->id, p->id, c->ictx && c->octx); |
1257 | c->ictx && c->octx); |
1247 | |
1258 | |
1248 | if (c->ictx && c->octx) |
1259 | if (c->ictx && c->octx) |
1249 | { |
1260 | { |
1250 | // send connect_info packets to both sides, in case one is |
1261 | // send connect_info packets to both sides, in case one is |
1251 | // behind a nat firewall (or both ;) |
1262 | // behind a nat firewall (or both ;) |
… | |
… | |
1274 | |
1285 | |
1275 | c->conf->protocols = p->protocols; |
1286 | c->conf->protocols = p->protocols; |
1276 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1287 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1277 | p->si.upgrade_protocol (protocol, c->conf); |
1288 | p->si.upgrade_protocol (protocol, c->conf); |
1278 | |
1289 | |
1279 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1290 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1280 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1291 | conf->nodename, |
|
|
1292 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1293 | (const char *)p->si, |
|
|
1294 | p->protocols, |
|
|
1295 | protocol, |
|
|
1296 | p->si.supported_protocols (c->conf), |
|
|
1297 | !c->ictx && !c->octx); |
1281 | |
1298 | |
1282 | const sockinfo &dsi = forward_si (p->si); |
1299 | const sockinfo &dsi = forward_si (p->si); |
1283 | |
1300 | |
1284 | if (dsi.valid ()) |
1301 | if (dsi.valid ()) |
1285 | c->send_auth_request (dsi, true); |
1302 | c->send_auth_request (dsi, true); |
|
|
1303 | else |
|
|
1304 | slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
|
|
1305 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1306 | (const char *)p->si); |
1286 | } |
1307 | } |
1287 | else |
1308 | else |
1288 | slog (L_WARN, |
1309 | slog (L_WARN, |
1289 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1310 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1290 | p->id); |
1311 | p->id); |
… | |
… | |
1299 | } |
1320 | } |
1300 | |
1321 | |
1301 | inline void |
1322 | inline void |
1302 | connection::keepalive_cb (ev::timer &w, int revents) |
1323 | connection::keepalive_cb (ev::timer &w, int revents) |
1303 | { |
1324 | { |
1304 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1325 | ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
|
|
1326 | |
|
|
1327 | if (when >= 0) |
|
|
1328 | w.start (when); |
|
|
1329 | else if (when < -15) |
1305 | { |
1330 | { |
1306 | reset_connection (); |
1331 | reset_connection ("keepalive overdue"); |
1307 | establish_connection (); |
1332 | establish_connection (); |
1308 | } |
1333 | } |
1309 | else if (ev_now () < last_activity + ::conf.keepalive) |
|
|
1310 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
|
|
1311 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1334 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1312 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1335 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1313 | { |
1336 | { |
|
|
1337 | w.start (3); |
1314 | send_ping (si); |
1338 | send_ping (si); |
1315 | w.start (5); |
|
|
1316 | } |
1339 | } |
1317 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1340 | else if (when >= -10) |
1318 | // hold ondemand connections implicitly a few seconds longer |
1341 | // hold ondemand connections implicitly a few seconds longer |
1319 | // should delete octx, though, or something like that ;) |
1342 | // should delete octx, though, or something like that ;) |
1320 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1343 | w.start (when + 10); |
1321 | else |
1344 | else |
1322 | reset_connection (); |
1345 | reset_connection ("keepalive timeout"); |
1323 | } |
1346 | } |
1324 | |
1347 | |
|
|
1348 | void |
1325 | void connection::send_connect_request (int id) |
1349 | connection::send_connect_request (int id) |
1326 | { |
1350 | { |
1327 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1351 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1328 | |
1352 | |
1329 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1353 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1354 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1355 | THISNODE->protocols); |
1330 | p->hmac_set (octx); |
1356 | p->hmac_set (octx); |
1331 | send_vpn_packet (p, si); |
1357 | send_vpn_packet (p, si); |
1332 | |
1358 | |
1333 | delete p; |
1359 | delete p; |
1334 | } |
1360 | } |
1335 | |
1361 | |
|
|
1362 | void |
1336 | void connection::script_init_env (const char *ext) |
1363 | connection::script_init_env (const char *ext) |
1337 | { |
1364 | { |
1338 | char *env; |
1365 | char *env; |
1339 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1366 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1340 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1367 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1341 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1368 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1342 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1369 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1343 | conf->id & 0xff); putenv (env); |
1370 | conf->id & 0xff); putenv (env); |
1344 | } |
1371 | } |
1345 | |
1372 | |
|
|
1373 | void |
1346 | void connection::script_init_connect_env () |
1374 | connection::script_init_connect_env () |
1347 | { |
1375 | { |
1348 | vpn->script_init_env (); |
1376 | vpn->script_init_env (); |
1349 | |
1377 | |
1350 | char *env; |
1378 | char *env; |
1351 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1379 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1380 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1352 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1381 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1353 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1382 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1354 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1383 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1355 | } |
1384 | } |
1356 | |
1385 | |
1357 | inline const char * |
1386 | inline const char * |
1358 | connection::script_node_up () |
1387 | connection::script_node_up () |
1359 | { |
1388 | { |
… | |
… | |
1364 | char *filename; |
1393 | char *filename; |
1365 | asprintf (&filename, |
1394 | asprintf (&filename, |
1366 | "%s/%s", |
1395 | "%s/%s", |
1367 | confbase, |
1396 | confbase, |
1368 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1397 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
|
|
1398 | |
|
|
1399 | return filename; |
|
|
1400 | } |
|
|
1401 | |
|
|
1402 | inline const char * |
|
|
1403 | connection::script_node_change () |
|
|
1404 | { |
|
|
1405 | script_init_connect_env (); |
|
|
1406 | |
|
|
1407 | putenv ((char *)"STATE=change"); |
|
|
1408 | |
|
|
1409 | char *filename; |
|
|
1410 | asprintf (&filename, |
|
|
1411 | "%s/%s", |
|
|
1412 | confbase, |
|
|
1413 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
1369 | |
1414 | |
1370 | return filename; |
1415 | return filename; |
1371 | } |
1416 | } |
1372 | |
1417 | |
1373 | inline const char * |
1418 | inline const char * |
… | |
… | |
1399 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1444 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1400 | |
1445 | |
1401 | last_establish_attempt = 0.; |
1446 | last_establish_attempt = 0.; |
1402 | octx = ictx = 0; |
1447 | octx = ictx = 0; |
1403 | |
1448 | |
1404 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1405 | conf->protocols = PROT_UDPv4; |
|
|
1406 | |
|
|
1407 | connectmode = conf->connectmode; |
1449 | connectmode = conf->connectmode; |
1408 | |
1450 | |
1409 | // queue a dummy packet to force an initial connection attempt |
1451 | // queue a dummy packet to force an initial connection attempt |
1410 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1452 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1411 | vpn_queue.put (new net_packet); |
1453 | vpn_queue.put (new net_packet); |
1412 | |
1454 | |
1413 | reset_connection (); |
1455 | reset_connection ("startup"); |
1414 | } |
1456 | } |
1415 | |
1457 | |
1416 | connection::~connection () |
1458 | connection::~connection () |
1417 | { |
1459 | { |
1418 | shutdown (); |
1460 | shutdown (); |
1419 | } |
1461 | } |
1420 | |
1462 | |
|
|
1463 | void |
1421 | void connection_init () |
1464 | connection_init () |
1422 | { |
1465 | { |
1423 | auth_rate_limiter.clear (); |
1466 | auth_rate_limiter.clear (); |
1424 | reset_rate_limiter.clear (); |
1467 | reset_rate_limiter.clear (); |
1425 | } |
1468 | } |
1426 | |
1469 | |