1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
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3 | Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
5 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
7 | (at your option) any later version. |
10 | option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
12 | GNU General Public License for more details. |
15 | Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
15 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
17 | */ |
30 | */ |
18 | |
31 | |
19 | #include "config.h" |
32 | #include "config.h" |
20 | |
33 | |
21 | extern "C" { |
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22 | # include "lzf/lzf.h" |
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23 | } |
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24 | |
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25 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
26 | |
37 | |
27 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
29 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
30 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
31 | |
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32 | #include "gettext.h" |
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33 | |
42 | |
34 | #include "conf.h" |
43 | #include "conf.h" |
35 | #include "slog.h" |
44 | #include "slog.h" |
36 | #include "device.h" |
45 | #include "device.h" |
37 | #include "vpn.h" |
46 | #include "vpn.h" |
38 | #include "connection.h" |
47 | #include "connection.h" |
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48 | #include "hkdf.h" |
39 | |
49 | |
40 | #if !HAVE_RAND_PSEUDO_BYTES |
50 | #include "netcompat.h" |
41 | # define RAND_pseudo_bytes RAND_bytes |
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42 | #endif |
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43 | |
51 | |
44 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
52 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic |
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53 | |
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54 | #define ULTRA_FAST 1 |
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55 | #define HLOG 15 |
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56 | #include "lzf/lzf.h" |
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57 | #include "lzf/lzf_c.c" |
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58 | #include "lzf/lzf_d.c" |
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59 | |
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60 | ////////////////////////////////////////////////////////////////////////////// |
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61 | |
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62 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
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63 | static ev::child rs_child_ev; |
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64 | |
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65 | namespace |
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66 | { |
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67 | void // c++ requires external linkage here, apparently :( |
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68 | rs_child_cb (ev::child &w, int revents) |
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69 | { |
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70 | w.stop (); |
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71 | |
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72 | if (rs_queue.empty ()) |
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73 | return; |
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74 | |
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75 | pid_t pid = run_script (*rs_queue.front ().first, false); |
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76 | if (pid) |
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77 | { |
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78 | w.set (pid); |
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79 | w.start (); |
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80 | } |
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81 | else |
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82 | slog (L_WARN, rs_queue.front ().second); |
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83 | |
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84 | delete rs_queue.front ().first; |
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85 | rs_queue.pop (); |
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86 | } |
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87 | }; |
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88 | |
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89 | // despite the fancy name, this is quite a hack |
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90 | static void |
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91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
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92 | { |
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93 | rs_queue.push (std::make_pair (cb, warnmsg)); |
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94 | |
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95 | if (!rs_child_ev.is_active ()) |
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96 | { |
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97 | rs_child_ev.set<rs_child_cb> (); |
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98 | rs_child_ev (); |
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99 | } |
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100 | } |
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101 | |
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102 | ////////////////////////////////////////////////////////////////////////////// |
45 | |
103 | |
46 | struct crypto_ctx |
104 | struct crypto_ctx |
47 | { |
105 | { |
48 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
49 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
50 | |
108 | |
51 | crypto_ctx (const rsachallenge &challenge, int enc); |
109 | crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc); |
52 | ~crypto_ctx (); |
110 | ~crypto_ctx (); |
53 | }; |
111 | }; |
54 | |
112 | |
55 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
113 | crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc) |
56 | { |
114 | { |
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115 | ecdh_key s; |
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116 | |
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117 | curve25519_combine (a, b, s); |
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118 | |
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119 | { |
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120 | u8 mac_key[MAC_KEYSIZE]; |
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121 | static const unsigned char mac_info[] = "gvpe mac key"; |
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122 | |
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123 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
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124 | kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm)); |
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125 | kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key)); |
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126 | kdf.extract (s, sizeof (s)); |
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127 | kdf.extract_done (HKDF_PRF_HASH ()); |
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128 | kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info)); |
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129 | |
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130 | HMAC_CTX_init (&hctx); |
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131 | require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0)); |
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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 (auth2.rsa.ikm, sizeof (auth2.rsa.ikm)); |
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140 | kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key)); |
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141 | kdf.extract (s, sizeof (s)); |
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142 | kdf.extract_done (HKDF_PRF_HASH ()); |
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143 | kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info)); |
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144 | |
57 | EVP_CIPHER_CTX_init (&cctx); |
145 | EVP_CIPHER_CTX_init (&cctx); |
58 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
146 | require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc)); |
59 | HMAC_CTX_init (&hctx); |
147 | } |
60 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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61 | } |
148 | } |
62 | |
149 | |
63 | crypto_ctx::~crypto_ctx () |
150 | crypto_ctx::~crypto_ctx () |
64 | { |
151 | { |
65 | EVP_CIPHER_CTX_cleanup (&cctx); |
152 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
66 | HMAC_CTX_cleanup (&hctx); |
153 | HMAC_CTX_cleanup (&hctx); |
67 | } |
154 | } |
68 | |
155 | |
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156 | static inline void |
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157 | auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr) |
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158 | { |
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159 | if (RSA_public_encrypt (sizeof (auth.rsa), |
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160 | (unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa, |
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161 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
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162 | fatal ("RSA_public_encrypt error"); |
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163 | |
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164 | memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh)); |
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165 | } |
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166 | |
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167 | static inline bool |
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168 | auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth) |
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169 | { |
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170 | u8 rsa_decrypt[RSA_KEYLEN]; |
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171 | |
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172 | if (RSA_private_decrypt (sizeof (encr.rsa), |
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173 | (const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt, |
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174 | key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa)) |
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175 | return 0; |
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176 | |
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177 | memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa)); |
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178 | memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh)); |
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179 | |
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180 | return 1; |
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181 | } |
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182 | |
69 | static void |
183 | static void |
70 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
184 | auth_hash (const auth_data &auth, auth_mac &mac) |
71 | { |
185 | { |
72 | EVP_MD_CTX ctx; |
186 | HMAC_CTX ctx; |
73 | |
187 | |
74 | EVP_MD_CTX_init (&ctx); |
188 | HMAC_CTX_init (&ctx); |
75 | EVP_DigestInit (&ctx, RSA_HASH); |
189 | require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0)); |
76 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
190 | require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth)); |
77 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
191 | require (HMAC_Final (&ctx, (unsigned char *)&mac, 0)); |
78 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
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79 | EVP_MD_CTX_cleanup (&ctx); |
192 | HMAC_CTX_cleanup (&ctx); |
80 | } |
193 | } |
81 | |
194 | |
82 | struct rsa_entry { |
195 | void |
83 | tstamp expire; |
196 | connection::generate_auth_data () |
84 | rsaid id; |
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85 | rsachallenge chg; |
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86 | }; |
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87 | |
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88 | struct rsa_cache : list<rsa_entry> |
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89 | { |
197 | { |
90 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
198 | if (auth_expire < ev_now ()) |
91 | |
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92 | bool find (const rsaid &id, rsachallenge &chg) |
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93 | { |
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94 | for (iterator i = begin (); i != end (); ++i) |
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95 | { |
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96 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
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97 | { |
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98 | memcpy (&chg, &i->chg, sizeof chg); |
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99 | |
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100 | erase (i); |
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101 | return true; |
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102 | } |
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103 | } |
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104 | |
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105 | if (cleaner.at < NOW) |
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106 | cleaner.start (NOW + RSA_TTL); |
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107 | |
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108 | return false; |
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109 | } |
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110 | |
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111 | void gen (rsaid &id, rsachallenge &chg) |
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112 | { |
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113 | rsa_entry e; |
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114 | |
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115 | RAND_bytes ((unsigned char *)&id, sizeof id); |
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116 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
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117 | |
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118 | e.expire = NOW + RSA_TTL; |
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119 | e.id = id; |
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120 | memcpy (&e.chg, &chg, sizeof chg); |
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121 | |
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122 | push_back (e); |
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123 | |
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124 | if (cleaner.at < NOW) |
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125 | cleaner.start (NOW + RSA_TTL); |
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126 | } |
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127 | |
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128 | rsa_cache () |
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129 | : cleaner (this, &rsa_cache::cleaner_cb) |
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130 | { } |
199 | { |
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200 | // request data |
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201 | RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa); |
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202 | curve25519_generate (snd_ecdh_a, snd_auth.ecdh); |
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203 | auth_hash (snd_auth, snd_auth_mac); |
131 | |
204 | |
132 | } rsa_cache; |
205 | // eventual response data |
133 | |
206 | curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); |
134 | void rsa_cache::cleaner_cb (time_watcher &w) |
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135 | { |
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136 | if (empty ()) |
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137 | w.at = TSTAMP_CANCEL; |
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138 | else |
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139 | { |
207 | } |
140 | w.at = NOW + RSA_TTL; |
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141 | |
208 | |
142 | for (iterator i = begin (); i != end (); ) |
209 | // every use prolongs the expiry |
143 | if (i->expire <= NOW) |
210 | auth_expire = ev_now () + AUTH_TTL; |
144 | i = erase (i); |
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145 | else |
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146 | ++i; |
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147 | } |
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148 | } |
211 | } |
149 | |
212 | |
150 | ////////////////////////////////////////////////////////////////////////////// |
213 | ////////////////////////////////////////////////////////////////////////////// |
151 | |
214 | |
152 | void pkt_queue::put (net_packet *p) |
215 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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216 | : max_ttl (max_ttl), max_queue (max_queue) |
153 | { |
217 | { |
154 | if (queue[i]) |
218 | queue = new pkt [max_queue]; |
155 | { |
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156 | delete queue[i]; |
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157 | j = (j + 1) % QUEUEDEPTH; |
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158 | } |
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159 | |
219 | |
160 | queue[i] = p; |
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161 | |
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162 | i = (i + 1) % QUEUEDEPTH; |
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163 | } |
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164 | |
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165 | net_packet *pkt_queue::get () |
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166 | { |
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167 | net_packet *p = queue[j]; |
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168 | |
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169 | if (p) |
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170 | { |
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171 | queue[j] = 0; |
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172 | j = (j + 1) % QUEUEDEPTH; |
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173 | } |
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174 | |
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175 | return p; |
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176 | } |
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177 | |
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178 | pkt_queue::pkt_queue () |
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179 | { |
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180 | memset (queue, 0, sizeof (queue)); |
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181 | i = 0; |
220 | i = 0; |
182 | j = 0; |
221 | j = 0; |
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222 | |
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223 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
183 | } |
224 | } |
184 | |
225 | |
185 | pkt_queue::~pkt_queue () |
226 | pkt_queue::~pkt_queue () |
186 | { |
227 | { |
187 | for (i = QUEUEDEPTH; --i > 0; ) |
228 | while (net_packet *p = get ()) |
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229 | delete p; |
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230 | |
188 | delete queue[i]; |
231 | delete [] queue; |
189 | } |
232 | } |
190 | |
233 | |
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234 | void |
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235 | pkt_queue::expire_cb (ev::timer &w, int revents) |
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236 | { |
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237 | ev_tstamp expire = ev_now () - max_ttl; |
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238 | |
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239 | for (;;) |
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240 | { |
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241 | if (empty ()) |
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242 | break; |
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243 | |
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244 | double diff = queue[j].tstamp - expire; |
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245 | |
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246 | if (diff >= 0.) |
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247 | { |
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248 | w.start (diff > 0.5 ? diff : 0.5); |
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249 | break; |
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250 | } |
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251 | |
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252 | delete get (); |
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253 | } |
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254 | } |
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255 | |
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256 | void |
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257 | pkt_queue::put (net_packet *p) |
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258 | { |
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259 | ev_tstamp now = ev_now (); |
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260 | |
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261 | // start expiry timer |
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262 | if (empty ()) |
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263 | expire.start (max_ttl); |
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264 | |
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265 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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266 | |
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267 | if (ni == j) |
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268 | delete get (); |
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269 | |
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270 | queue[i].pkt = p; |
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271 | queue[i].tstamp = now; |
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272 | |
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273 | i = ni; |
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274 | } |
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275 | |
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276 | net_packet * |
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277 | pkt_queue::get () |
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278 | { |
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279 | if (empty ()) |
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280 | return 0; |
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281 | |
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282 | net_packet *p = queue[j].pkt; |
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283 | queue[j].pkt = 0; |
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284 | |
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285 | j = j + 1 == max_queue ? 0 : j + 1; |
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286 | |
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287 | return p; |
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288 | } |
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289 | |
191 | struct net_rateinfo { |
290 | struct net_rateinfo |
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291 | { |
192 | u32 host; |
292 | u32 host; |
193 | double pcnt, diff; |
293 | double pcnt, diff; |
194 | tstamp last; |
294 | tstamp last; |
195 | }; |
295 | }; |
196 | |
296 | |
197 | // only do action once every x seconds per host whole allowing bursts. |
297 | // only do action once every x seconds per host whole allowing bursts. |
198 | // this implementation ("splay list" ;) is inefficient, |
298 | // this implementation ("splay list" ;) is inefficient, |
199 | // but low on resources. |
299 | // but low on resources. |
200 | struct net_rate_limiter : list<net_rateinfo> |
300 | struct net_rate_limiter : list<net_rateinfo> |
201 | { |
301 | { |
202 | static const double ALPHA = 1. - 1. / 180.; // allow bursts |
302 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
203 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
303 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
204 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
304 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
205 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
305 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
206 | |
306 | |
207 | bool can (const sockinfo &si) { return can((u32)si.host); } |
307 | bool can (const sockinfo &si) { return can((u32)si.host); } |
208 | bool can (u32 host); |
308 | bool can (u32 host); |
209 | }; |
309 | }; |
210 | |
310 | |
211 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
311 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
212 | |
312 | |
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313 | bool |
213 | bool net_rate_limiter::can (u32 host) |
314 | net_rate_limiter::can (u32 host) |
214 | { |
315 | { |
215 | iterator i; |
316 | iterator i; |
216 | |
317 | |
217 | for (i = begin (); i != end (); ) |
318 | for (i = begin (); i != end (); ) |
218 | if (i->host == host) |
319 | if (i->host == host) |
219 | break; |
320 | break; |
220 | else if (i->last < NOW - EXPIRE) |
321 | else if (i->last < ev_now () - NRL_EXPIRE) |
221 | i = erase (i); |
322 | i = erase (i); |
222 | else |
323 | else |
223 | i++; |
324 | i++; |
224 | |
325 | |
225 | if (i == end ()) |
326 | if (i == end ()) |
226 | { |
327 | { |
227 | net_rateinfo ri; |
328 | net_rateinfo ri; |
228 | |
329 | |
229 | ri.host = host; |
330 | ri.host = host; |
230 | ri.pcnt = 1.; |
331 | ri.pcnt = 1.; |
231 | ri.diff = MAXDIF; |
332 | ri.diff = NRL_MAXDIF; |
232 | ri.last = NOW; |
333 | ri.last = ev_now (); |
233 | |
334 | |
234 | push_front (ri); |
335 | push_front (ri); |
235 | |
336 | |
236 | return true; |
337 | return true; |
237 | } |
338 | } |
238 | else |
339 | else |
239 | { |
340 | { |
240 | net_rateinfo ri (*i); |
341 | net_rateinfo ri (*i); |
241 | erase (i); |
342 | erase (i); |
242 | |
343 | |
243 | ri.pcnt = ri.pcnt * ALPHA; |
344 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
244 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
345 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
245 | |
346 | |
246 | ri.last = NOW; |
347 | ri.last = ev_now (); |
247 | |
348 | |
248 | double dif = ri.diff / ri.pcnt; |
349 | double dif = ri.diff / ri.pcnt; |
249 | |
350 | |
250 | bool send = dif > CUTOFF; |
351 | bool send = dif > NRL_CUTOFF; |
251 | |
352 | |
252 | if (dif > MAXDIF) |
353 | if (dif > NRL_MAXDIF) |
253 | { |
354 | { |
254 | ri.pcnt = 1.; |
355 | ri.pcnt = 1.; |
255 | ri.diff = MAXDIF; |
356 | ri.diff = NRL_MAXDIF; |
256 | } |
357 | } |
257 | else if (send) |
358 | else if (send) |
258 | ri.pcnt++; |
359 | ri.pcnt++; |
259 | |
360 | |
260 | push_front (ri); |
361 | push_front (ri); |
… | |
… | |
265 | |
366 | |
266 | ///////////////////////////////////////////////////////////////////////////// |
367 | ///////////////////////////////////////////////////////////////////////////// |
267 | |
368 | |
268 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
369 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
269 | |
370 | |
|
|
371 | void |
270 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
372 | hmac_packet::hmac_gen (crypto_ctx *ctx) |
271 | { |
373 | { |
272 | unsigned int xlen; |
374 | unsigned int xlen; |
273 | |
375 | |
274 | HMAC_CTX *hctx = &ctx->hctx; |
376 | HMAC_CTX *hctx = &ctx->hctx; |
275 | |
377 | |
276 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
378 | require (HMAC_Init_ex (hctx, 0, 0, 0, 0)); |
277 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
379 | require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
278 | len - sizeof (hmac_packet)); |
380 | len - sizeof (hmac_packet))); |
279 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
381 | require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen)); |
280 | } |
382 | } |
281 | |
383 | |
282 | void |
384 | void |
283 | hmac_packet::hmac_set (crypto_ctx *ctx) |
385 | hmac_packet::hmac_set (crypto_ctx *ctx) |
284 | { |
386 | { |
… | |
… | |
293 | hmac_gen (ctx); |
395 | hmac_gen (ctx); |
294 | |
396 | |
295 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
397 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
296 | } |
398 | } |
297 | |
399 | |
|
|
400 | void |
298 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
401 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
299 | { |
402 | { |
300 | type = type_; |
403 | type = type_; |
301 | |
404 | |
302 | int src = THISNODE->id; |
405 | int src = THISNODE->id; |
303 | |
406 | |
… | |
… | |
307 | } |
410 | } |
308 | |
411 | |
309 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
412 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
310 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
413 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
311 | |
414 | |
312 | struct vpndata_packet:vpn_packet |
415 | struct vpndata_packet : vpn_packet |
|
|
416 | { |
|
|
417 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
418 | |
|
|
419 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
420 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
421 | |
|
|
422 | private: |
|
|
423 | const u32 data_hdr_size () const |
313 | { |
424 | { |
314 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
315 | |
|
|
316 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
317 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
318 | private: |
|
|
319 | |
|
|
320 | const u32 data_hdr_size () const |
|
|
321 | { |
|
|
322 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
425 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
323 | } |
|
|
324 | }; |
426 | } |
|
|
427 | }; |
325 | |
428 | |
326 | void |
429 | void |
327 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
430 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
328 | { |
431 | { |
329 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
432 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
330 | int outl = 0, outl2; |
433 | int outl = 0, outl2; |
331 | ptype type = PT_DATA_UNCOMPRESSED; |
434 | ptype type = PT_DATA_UNCOMPRESSED; |
332 | |
435 | |
333 | #if ENABLE_COMPRESSION |
436 | #if ENABLE_COMPRESSION |
334 | u8 cdata[MAX_MTU]; |
437 | u8 cdata[MAX_MTU]; |
335 | u32 cl; |
|
|
336 | |
438 | |
|
|
439 | if (conn->features & FEATURE_COMPRESSION) |
|
|
440 | { |
337 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
441 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
442 | |
338 | if (cl) |
443 | if (cl) |
339 | { |
444 | { |
340 | type = PT_DATA_COMPRESSED; |
445 | type = PT_DATA_COMPRESSED; |
341 | d = cdata; |
446 | d = cdata; |
342 | l = cl + 2; |
447 | l = cl + 2; |
343 | |
448 | |
344 | d[0] = cl >> 8; |
449 | d[0] = cl >> 8; |
345 | d[1] = cl; |
450 | d[1] = cl; |
|
|
451 | } |
346 | } |
452 | } |
347 | #endif |
453 | #endif |
348 | |
454 | |
349 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
455 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1)); |
350 | |
456 | |
351 | struct { |
457 | struct { |
352 | #if RAND_SIZE |
458 | #if RAND_SIZE |
353 | u8 rnd[RAND_SIZE]; |
459 | u8 rnd[RAND_SIZE]; |
354 | #endif |
460 | #endif |
355 | u32 seqno; |
461 | u32 seqno; |
356 | } datahdr; |
462 | } datahdr; |
357 | |
463 | |
358 | datahdr.seqno = ntohl (seqno); |
464 | datahdr.seqno = ntohl (seqno); |
359 | #if RAND_SIZE |
465 | #if RAND_SIZE |
360 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
466 | RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
361 | #endif |
467 | #endif |
362 | |
468 | |
363 | EVP_EncryptUpdate (cctx, |
469 | require (EVP_EncryptUpdate (cctx, |
364 | (unsigned char *) data + outl, &outl2, |
470 | (unsigned char *) data + outl, &outl2, |
365 | (unsigned char *) &datahdr, DATAHDR); |
471 | (unsigned char *) &datahdr, DATAHDR)); |
366 | outl += outl2; |
472 | outl += outl2; |
367 | |
473 | |
368 | EVP_EncryptUpdate (cctx, |
474 | require (EVP_EncryptUpdate (cctx, |
369 | (unsigned char *) data + outl, &outl2, |
475 | (unsigned char *) data + outl, &outl2, |
370 | (unsigned char *) d, l); |
476 | (unsigned char *) d, l)); |
371 | outl += outl2; |
477 | outl += outl2; |
372 | |
478 | |
373 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
479 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
374 | outl += outl2; |
480 | outl += outl2; |
375 | |
481 | |
376 | len = outl + data_hdr_size (); |
482 | len = outl + data_hdr_size (); |
377 | |
483 | |
378 | set_hdr (type, dst); |
484 | set_hdr (type, dst); |
… | |
… | |
387 | int outl = 0, outl2; |
493 | int outl = 0, outl2; |
388 | tap_packet *p = new tap_packet; |
494 | tap_packet *p = new tap_packet; |
389 | u8 *d; |
495 | u8 *d; |
390 | u32 l = len - data_hdr_size (); |
496 | u32 l = len - data_hdr_size (); |
391 | |
497 | |
392 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
498 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0)); |
393 | |
499 | |
394 | #if ENABLE_COMPRESSION |
500 | #if ENABLE_COMPRESSION |
395 | u8 cdata[MAX_MTU]; |
501 | u8 cdata[MAX_MTU]; |
396 | |
502 | |
397 | if (type == PT_DATA_COMPRESSED) |
503 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
399 | else |
505 | else |
400 | #endif |
506 | #endif |
401 | d = &(*p)[6 + 6 - DATAHDR]; |
507 | d = &(*p)[6 + 6 - DATAHDR]; |
402 | |
508 | |
403 | /* this overwrites part of the src mac, but we fix that later */ |
509 | /* this overwrites part of the src mac, but we fix that later */ |
404 | EVP_DecryptUpdate (cctx, |
510 | require (EVP_DecryptUpdate (cctx, |
405 | d, &outl2, |
511 | d, &outl2, |
406 | (unsigned char *)&data, len - data_hdr_size ()); |
512 | (unsigned char *)&data, len - data_hdr_size ())); |
407 | outl += outl2; |
513 | outl += outl2; |
408 | |
514 | |
409 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
515 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
410 | outl += outl2; |
516 | outl += outl2; |
411 | |
517 | |
412 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
518 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
413 | |
519 | |
414 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
520 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
439 | } |
545 | } |
440 | }; |
546 | }; |
441 | |
547 | |
442 | struct config_packet : vpn_packet |
548 | struct config_packet : vpn_packet |
443 | { |
549 | { |
444 | // actually, hmaclen cannot be checked because the hmac |
|
|
445 | // field comes before this data, so peers with other |
|
|
446 | // hmacs simply will not work. |
|
|
447 | u8 prot_major, prot_minor, randsize, hmaclen; |
550 | u8 prot_major, prot_minor, randsize; |
448 | u8 flags, challengelen, pad2, pad3; |
551 | u8 flags, features, pad6, pad7, pad8; |
449 | u32 cipher_nid, digest_nid, hmac_nid; |
552 | u32 cipher_nid, mac_nid, auth_nid; |
450 | |
|
|
451 | const u8 curflags () const |
|
|
452 | { |
|
|
453 | return 0x80 |
|
|
454 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
455 | } |
|
|
456 | |
553 | |
457 | void setup (ptype type, int dst); |
554 | void setup (ptype type, int dst); |
458 | bool chk_config () const; |
555 | bool chk_config () const; |
|
|
556 | |
|
|
557 | static u8 get_features () |
|
|
558 | { |
|
|
559 | u8 f = 0; |
|
|
560 | #if ENABLE_COMPRESSION |
|
|
561 | f |= FEATURE_COMPRESSION; |
|
|
562 | #endif |
|
|
563 | #if ENABLE_ROHC |
|
|
564 | f |= FEATURE_ROHC; |
|
|
565 | #endif |
|
|
566 | #if ENABLE_BRIDGING |
|
|
567 | f |= FEATURE_BRIDGING; |
|
|
568 | #endif |
|
|
569 | return f; |
|
|
570 | } |
459 | }; |
571 | }; |
460 | |
572 | |
|
|
573 | void |
461 | void config_packet::setup (ptype type, int dst) |
574 | config_packet::setup (ptype type, int dst) |
462 | { |
575 | { |
463 | prot_major = PROTOCOL_MAJOR; |
576 | prot_major = PROTOCOL_MAJOR; |
464 | prot_minor = PROTOCOL_MINOR; |
577 | prot_minor = PROTOCOL_MINOR; |
465 | randsize = RAND_SIZE; |
578 | randsize = RAND_SIZE; |
466 | hmaclen = HMACLENGTH; |
579 | flags = 0; |
467 | flags = curflags (); |
580 | features = get_features (); |
468 | challengelen = sizeof (rsachallenge); |
|
|
469 | |
581 | |
470 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
582 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); |
471 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
|
|
472 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
583 | mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); |
|
|
584 | auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); |
473 | |
585 | |
474 | len = sizeof (*this) - sizeof (net_packet); |
586 | len = sizeof (*this) - sizeof (net_packet); |
475 | set_hdr (type, dst); |
587 | set_hdr (type, dst); |
476 | } |
588 | } |
477 | |
589 | |
|
|
590 | bool |
478 | bool config_packet::chk_config () const |
591 | config_packet::chk_config () const |
479 | { |
592 | { |
480 | return prot_major == PROTOCOL_MAJOR |
593 | if (prot_major != PROTOCOL_MAJOR) |
481 | && randsize == RAND_SIZE |
594 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
482 | && hmaclen == HMACLENGTH |
595 | else if (randsize != RAND_SIZE) |
483 | && flags == curflags () |
596 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
484 | && challengelen == sizeof (rsachallenge) |
|
|
485 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
597 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ()))) |
486 | && digest_nid == htonl (EVP_MD_type (RSA_HASH)) |
598 | slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ())); |
487 | && hmac_nid == htonl (EVP_MD_type (DIGEST)); |
599 | else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ()))) |
488 | } |
600 | slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); |
|
|
601 | else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) |
|
|
602 | slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); |
|
|
603 | else |
|
|
604 | return true; |
489 | |
605 | |
|
|
606 | return false; |
|
|
607 | } |
|
|
608 | |
490 | struct auth_req_packet : config_packet |
609 | struct auth_req_packet : config_packet // UNPROTECTED |
491 | { |
610 | { |
492 | char magic[8]; |
611 | char magic[8]; |
493 | u8 initiate; // false if this is just an automatic reply |
612 | u8 initiate; // false if this is just an automatic reply |
494 | u8 protocols; // supported protocols (will get patches on forward) |
613 | u8 protocols; // supported protocols (will be patched on forward) |
495 | u8 pad2, pad3; |
614 | u8 pad2, pad3; |
496 | rsaid id; |
615 | auth_encr encr; |
497 | rsaencrdata encr; |
|
|
498 | |
616 | |
499 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
617 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
500 | { |
618 | { |
501 | config_packet::setup (PT_AUTH_REQ, dst); |
619 | config_packet::setup (PT_AUTH_REQ, dst); |
502 | strncpy (magic, MAGIC, 8); |
620 | memcpy (magic, MAGIC, 8); |
503 | initiate = !!initiate_; |
621 | initiate = !!initiate_; |
504 | protocols = protocols_; |
622 | protocols = protocols_; |
505 | |
623 | |
506 | len = sizeof (*this) - sizeof (net_packet); |
624 | len = sizeof (*this) - sizeof (net_packet); |
507 | } |
625 | } |
508 | }; |
626 | }; |
509 | |
627 | |
510 | struct auth_res_packet : config_packet |
628 | struct auth_res_packet : config_packet // UNPROTECTED |
511 | { |
629 | { |
512 | rsaid id; |
|
|
513 | u8 pad1, pad2, pad3; |
|
|
514 | u8 response_len; // encrypted length |
|
|
515 | rsaresponse response; |
630 | auth_response response; |
516 | |
631 | |
517 | auth_res_packet (int dst) |
632 | auth_res_packet (int dst) |
518 | { |
633 | { |
519 | config_packet::setup (PT_AUTH_RES, dst); |
634 | config_packet::setup (PT_AUTH_RES, dst); |
520 | |
635 | |
… | |
… | |
554 | }; |
669 | }; |
555 | |
670 | |
556 | ///////////////////////////////////////////////////////////////////////////// |
671 | ///////////////////////////////////////////////////////////////////////////// |
557 | |
672 | |
558 | void |
673 | void |
559 | connection::connection_established () |
674 | connection::connection_established (const sockinfo &rsi) |
560 | { |
675 | { |
|
|
676 | if (!have_snd_auth || !have_rcv_auth) |
|
|
677 | return; |
|
|
678 | |
|
|
679 | si = rsi; |
|
|
680 | protocol = rsi.prot; |
|
|
681 | |
|
|
682 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
683 | conf->nodename, (const char *)rsi, |
|
|
684 | is_direct ? "direct" : "forwarded", |
|
|
685 | PROTOCOL_MAJOR, prot_minor); |
|
|
686 | |
|
|
687 | if (::conf.script_node_up) |
|
|
688 | { |
|
|
689 | run_script_cb *cb = new run_script_cb; |
|
|
690 | cb->set<connection, &connection::script_node_up> (this); |
|
|
691 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
692 | } |
|
|
693 | |
|
|
694 | delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0); |
|
|
695 | iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); |
|
|
696 | |
|
|
697 | delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); |
|
|
698 | oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; |
|
|
699 | |
561 | if (ictx && octx) |
700 | if (ictx && octx) |
562 | { |
701 | { |
563 | connectmode = conf->connectmode; |
702 | // make sure rekeying timeouts are slightly asymmetric |
|
|
703 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
|
|
704 | rekey.start (rekey_interval, rekey_interval); |
564 | |
705 | |
565 | rekey.start (NOW + ::conf.rekey); |
|
|
566 | keepalive.start (NOW + ::conf.keepalive); |
706 | keepalive.start (::conf.keepalive); |
567 | |
707 | |
568 | // send queued packets |
708 | // send queued packets |
569 | if (ictx && octx) |
709 | if (ictx && octx) |
570 | { |
710 | { |
571 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
711 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
572 | { |
712 | { |
573 | send_data_packet (p); |
713 | if (p->len) send_data_packet (p); |
574 | delete p; |
714 | delete p; |
575 | } |
715 | } |
576 | |
716 | |
577 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
717 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
578 | { |
718 | { |
579 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
719 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
580 | delete p; |
720 | delete p; |
581 | } |
721 | } |
582 | } |
722 | } |
|
|
723 | |
|
|
724 | vpn->connection_established (this); |
583 | } |
725 | } |
|
|
726 | #if 0 |
584 | else |
727 | else |
585 | { |
728 | { |
586 | retry_cnt = 0; |
729 | retry_cnt = 0; |
587 | establish_connection.start (NOW + 5); |
730 | establish_connection.start (5); |
588 | keepalive.reset (); |
731 | keepalive.stop (); |
589 | rekey.reset (); |
732 | rekey.stop (); |
590 | } |
733 | } |
|
|
734 | #endif |
591 | } |
735 | } |
592 | |
736 | |
593 | void |
737 | void |
594 | connection::reset_si () |
738 | connection::reset_si () |
595 | { |
739 | { |
|
|
740 | if (vpn->can_direct (THISNODE, conf)) |
596 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
741 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
597 | |
742 | else |
598 | // mask out protocols we cannot establish |
743 | { |
599 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
744 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
600 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
745 | protocol = 0; |
|
|
746 | } |
601 | |
747 | |
602 | si.set (conf, protocol); |
748 | si.set (conf, protocol); |
|
|
749 | |
|
|
750 | is_direct = si.valid (); |
603 | } |
751 | } |
604 | |
752 | |
605 | // ensure sockinfo is valid, forward if necessary |
753 | // ensure sockinfo is valid, forward if necessary |
606 | const sockinfo & |
754 | const sockinfo & |
607 | connection::forward_si (const sockinfo &si) const |
755 | connection::forward_si (const sockinfo &si) const |
608 | { |
756 | { |
609 | if (!si.valid ()) |
757 | if (!si.valid ()) |
610 | { |
758 | { |
611 | connection *r = vpn->find_router (); |
759 | connection *r = vpn->find_router_for (this); |
612 | |
760 | |
613 | if (r) |
761 | if (r) |
614 | { |
762 | { |
615 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
763 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
616 | conf->nodename, r->conf->nodename); |
764 | conf->nodename, r->conf->nodename); |
617 | return r->si; |
765 | return r->si; |
618 | } |
766 | } |
619 | else |
767 | else |
620 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
768 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
621 | conf->nodename); |
769 | conf->nodename); |
622 | } |
770 | } |
623 | |
771 | |
624 | return si; |
772 | return si; |
625 | } |
773 | } |
… | |
… | |
635 | connection::send_ping (const sockinfo &si, u8 pong) |
783 | connection::send_ping (const sockinfo &si, u8 pong) |
636 | { |
784 | { |
637 | ping_packet *pkt = new ping_packet; |
785 | ping_packet *pkt = new ping_packet; |
638 | |
786 | |
639 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
787 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
788 | |
|
|
789 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
640 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
790 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
641 | |
791 | |
642 | delete pkt; |
792 | delete pkt; |
643 | } |
793 | } |
644 | |
794 | |
… | |
… | |
659 | void |
809 | void |
660 | connection::send_auth_request (const sockinfo &si, bool initiate) |
810 | connection::send_auth_request (const sockinfo &si, bool initiate) |
661 | { |
811 | { |
662 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
812 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
663 | |
813 | |
664 | rsachallenge chg; |
814 | generate_auth_data (); |
|
|
815 | auth_encrypt (conf->rsa_key, snd_auth, pkt->encr); |
665 | |
816 | |
666 | rsa_cache.gen (pkt->id, chg); |
|
|
667 | |
|
|
668 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
669 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
670 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
671 | fatal ("RSA_public_encrypt error"); |
|
|
672 | |
|
|
673 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
817 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
674 | |
|
|
675 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
818 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
676 | |
819 | |
677 | delete pkt; |
820 | delete pkt; |
678 | } |
821 | } |
679 | |
822 | |
680 | void |
823 | void |
681 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
824 | connection::send_auth_response (const sockinfo &si) |
682 | { |
825 | { |
683 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
826 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
684 | |
827 | |
685 | pkt->id = id; |
828 | auth_hash (rcv_auth, pkt->response.mac); |
|
|
829 | memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b)); |
686 | |
830 | |
687 | rsa_hash (id, chg, pkt->response); |
|
|
688 | |
|
|
689 | pkt->hmac_set (octx); |
|
|
690 | |
|
|
691 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
831 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
692 | |
|
|
693 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
832 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
694 | |
833 | |
695 | delete pkt; |
834 | delete pkt; |
696 | } |
835 | } |
697 | |
836 | |
698 | void |
837 | void |
699 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
838 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
700 | { |
839 | { |
701 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
840 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
702 | conf->id, rid, (const char *)rsi); |
841 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
842 | conf->protocols); |
703 | |
843 | |
704 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
844 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
705 | |
845 | |
706 | r->hmac_set (octx); |
846 | r->hmac_set (octx); |
707 | send_vpn_packet (r, si); |
847 | send_vpn_packet (r, si); |
708 | |
848 | |
709 | delete r; |
849 | delete r; |
710 | } |
850 | } |
711 | |
851 | |
712 | void |
852 | inline void |
713 | connection::establish_connection_cb (time_watcher &w) |
853 | connection::establish_connection_cb (ev::timer &w, int revents) |
714 | { |
854 | { |
715 | if (ictx || conf == THISNODE |
855 | if (!(ictx && octx) |
|
|
856 | && conf != THISNODE |
716 | || connectmode == conf_node::C_NEVER |
857 | && connectmode != conf_node::C_NEVER |
717 | || connectmode == conf_node::C_DISABLED) |
858 | && connectmode != conf_node::C_DISABLED |
718 | w.at = TSTAMP_CANCEL; |
859 | && !w.is_active ()) |
719 | else if (w.at <= NOW) |
|
|
720 | { |
860 | { |
721 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
861 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
722 | |
862 | // and stop trying. should probably be handled by a per-connection expire handler. |
723 | if (retry_int < 3600 * 8) |
863 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
864 | { |
|
|
865 | reset_connection (); |
724 | retry_cnt++; |
866 | return; |
|
|
867 | } |
725 | |
868 | |
726 | w.at = NOW + retry_int; |
869 | last_establish_attempt = ev_now (); |
|
|
870 | |
|
|
871 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
|
|
872 | ? (retry_cnt & 3) + 1 |
|
|
873 | : 1 << (retry_cnt >> 2)); |
727 | |
874 | |
728 | reset_si (); |
875 | reset_si (); |
729 | |
876 | |
730 | if (si.prot && !si.host) |
877 | bool slow = si.prot & PROT_SLOW; |
|
|
878 | |
|
|
879 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
|
|
880 | { |
|
|
881 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
882 | w.start (1); |
731 | vpn->send_connect_request (conf->id); |
883 | vpn->send_connect_request (this); |
|
|
884 | } |
732 | else |
885 | else |
733 | { |
886 | { |
|
|
887 | if (si.valid ()) |
|
|
888 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
889 | conf->nodename, (const char *)si); |
|
|
890 | |
734 | const sockinfo &dsi = forward_si (si); |
891 | const sockinfo &dsi = forward_si (si); |
|
|
892 | |
|
|
893 | slow = slow || (dsi.prot & PROT_SLOW); |
735 | |
894 | |
736 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
895 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
737 | { |
896 | { |
738 | if (retry_cnt < 4) |
897 | if (retry_cnt < 4) |
739 | send_auth_request (dsi, true); |
898 | send_auth_request (dsi, true); |
740 | else |
899 | else |
741 | send_ping (dsi, 0); |
900 | send_ping (dsi, 0); |
742 | } |
901 | } |
743 | } |
902 | } |
|
|
903 | |
|
|
904 | retry_int *= slow ? 8. : 0.9; |
|
|
905 | |
|
|
906 | if (retry_int < conf->max_retry) |
|
|
907 | retry_cnt++; |
|
|
908 | else |
|
|
909 | retry_int = conf->max_retry; |
|
|
910 | |
|
|
911 | w.start (retry_int); |
744 | } |
912 | } |
745 | } |
913 | } |
746 | |
914 | |
747 | void |
915 | void |
748 | connection::reset_connection () |
916 | connection::reset_connection () |
… | |
… | |
751 | { |
919 | { |
752 | slog (L_INFO, _("%s(%s): connection lost"), |
920 | slog (L_INFO, _("%s(%s): connection lost"), |
753 | conf->nodename, (const char *)si); |
921 | conf->nodename, (const char *)si); |
754 | |
922 | |
755 | if (::conf.script_node_down) |
923 | if (::conf.script_node_down) |
756 | run_script (run_script_cb (this, &connection::script_node_down), false); |
924 | { |
|
|
925 | run_script_cb *cb = new run_script_cb; |
|
|
926 | cb->set<connection, &connection::script_node_down> (this); |
|
|
927 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
928 | } |
757 | } |
929 | } |
758 | |
930 | |
759 | delete ictx; ictx = 0; |
931 | delete ictx; ictx = 0; |
760 | delete octx; octx = 0; |
932 | delete octx; octx = 0; |
761 | |
933 | |
762 | si.host= 0; |
934 | si.host = 0; |
763 | |
935 | |
|
|
936 | have_snd_auth = false; |
|
|
937 | have_rcv_auth = false; |
|
|
938 | auth_expire = 0.; |
|
|
939 | |
764 | last_activity = 0; |
940 | last_activity = 0.; |
|
|
941 | //last_si_change = 0.; |
765 | retry_cnt = 0; |
942 | retry_cnt = 0; |
766 | |
943 | |
767 | rekey.reset (); |
944 | rekey.stop (); |
768 | keepalive.reset (); |
945 | keepalive.stop (); |
769 | establish_connection.reset (); |
946 | establish_connection.stop (); |
770 | } |
947 | } |
771 | |
948 | |
772 | void |
949 | void |
773 | connection::shutdown () |
950 | connection::shutdown () |
774 | { |
951 | { |
… | |
… | |
776 | send_reset (si); |
953 | send_reset (si); |
777 | |
954 | |
778 | reset_connection (); |
955 | reset_connection (); |
779 | } |
956 | } |
780 | |
957 | |
781 | void |
958 | // poor-man's rekeying |
782 | connection::rekey_cb (time_watcher &w) |
959 | inline void |
|
|
960 | connection::rekey_cb (ev::timer &w, int revents) |
783 | { |
961 | { |
784 | w.at = TSTAMP_CANCEL; |
|
|
785 | |
|
|
786 | reset_connection (); |
962 | reset_connection (); |
787 | establish_connection (); |
963 | establish_connection (); |
788 | } |
964 | } |
789 | |
965 | |
790 | void |
966 | void |
791 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
967 | connection::send_data_packet (tap_packet *pkt) |
792 | { |
968 | { |
793 | vpndata_packet *p = new vpndata_packet; |
969 | vpndata_packet *p = new vpndata_packet; |
794 | int tos = 0; |
970 | int tos = 0; |
795 | |
971 | |
796 | // I am not hilarious about peeking into packets, but so be it. |
972 | // I am not hilarious about peeking into packets, but so be it. |
797 | if (conf->inherit_tos |
973 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
798 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
|
|
799 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
800 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
974 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
801 | |
975 | |
802 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
976 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
803 | send_vpn_packet (p, si, tos); |
977 | send_vpn_packet (p, si, tos); |
804 | |
978 | |
805 | delete p; |
979 | delete p; |
806 | |
980 | |
807 | if (oseqno > MAX_SEQNO) |
981 | if (oseqno > MAX_SEQNO) |
808 | rekey (); |
982 | rekey (); |
809 | } |
983 | } |
810 | |
984 | |
811 | void |
985 | void |
|
|
986 | connection::post_inject_queue () |
|
|
987 | { |
|
|
988 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
989 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
990 | establish_connection.stop (); |
|
|
991 | |
|
|
992 | establish_connection (); |
|
|
993 | } |
|
|
994 | |
|
|
995 | void |
812 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
996 | connection::inject_data_packet (tap_packet *pkt) |
813 | { |
997 | { |
814 | if (ictx && octx) |
998 | if (ictx && octx) |
815 | send_data_packet (pkt, broadcast); |
999 | send_data_packet (pkt); |
816 | else |
1000 | else |
817 | { |
1001 | { |
818 | if (!broadcast)//DDDD |
|
|
819 | data_queue.put (new tap_packet (*pkt)); |
1002 | data_queue.put (new tap_packet (*pkt)); |
820 | |
1003 | post_inject_queue (); |
821 | establish_connection (); |
|
|
822 | } |
1004 | } |
823 | } |
1005 | } |
824 | |
1006 | |
|
|
1007 | void |
825 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1008 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
826 | { |
1009 | { |
827 | if (ictx && octx) |
1010 | if (ictx && octx) |
828 | send_vpn_packet (pkt, si, tos); |
1011 | send_vpn_packet (pkt, si, tos); |
829 | else |
1012 | else |
830 | { |
1013 | { |
831 | vpn_queue.put (new vpn_packet (*pkt)); |
1014 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
832 | |
1015 | post_inject_queue (); |
833 | establish_connection (); |
|
|
834 | } |
1016 | } |
835 | } |
1017 | } |
836 | |
1018 | |
837 | void |
1019 | void |
838 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1020 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
839 | { |
1021 | { |
840 | last_activity = NOW; |
1022 | last_activity = ev_now (); |
841 | |
1023 | |
842 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1024 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
843 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1025 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1026 | |
|
|
1027 | if (connectmode == conf_node::C_DISABLED) |
|
|
1028 | return; |
844 | |
1029 | |
845 | switch (pkt->typ ()) |
1030 | switch (pkt->typ ()) |
846 | { |
1031 | { |
847 | case vpn_packet::PT_PING: |
1032 | case vpn_packet::PT_PING: |
|
|
1033 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1034 | |
848 | // we send pings instead of auth packets after some retries, |
1035 | // we send pings instead of auth packets after some retries, |
849 | // so reset the retry counter and establish a connection |
1036 | // so reset the retry counter and establish a connection |
850 | // when we receive a ping. |
1037 | // when we receive a ping. |
851 | if (!ictx) |
1038 | if (!ictx) |
852 | { |
1039 | { |
853 | if (auth_rate_limiter.can (rsi)) |
1040 | if (auth_rate_limiter.can (rsi)) |
854 | send_auth_request (rsi, true); |
1041 | send_auth_request (rsi, true); |
855 | } |
1042 | } |
856 | else |
1043 | else |
|
|
1044 | // we would love to change the socket address here, but ping's aren't |
|
|
1045 | // authenticated, so we best ignore it. |
857 | send_ping (rsi, 1); // pong |
1046 | send_ping (rsi, 1); // pong |
858 | |
1047 | |
859 | break; |
1048 | break; |
860 | |
1049 | |
861 | case vpn_packet::PT_PONG: |
1050 | case vpn_packet::PT_PONG: |
|
|
1051 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1052 | |
|
|
1053 | // a PONG might mean that the other side doesn't really know |
|
|
1054 | // about our desire for communication. |
|
|
1055 | establish_connection (); |
862 | break; |
1056 | break; |
863 | |
1057 | |
864 | case vpn_packet::PT_RESET: |
1058 | case vpn_packet::PT_RESET: |
865 | { |
1059 | { |
866 | reset_connection (); |
1060 | reset_connection (); |
867 | |
1061 | |
868 | config_packet *p = (config_packet *) pkt; |
1062 | config_packet *p = (config_packet *) pkt; |
869 | |
1063 | |
870 | if (!p->chk_config ()) |
1064 | if (!p->chk_config ()) |
871 | { |
1065 | { |
872 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1066 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
873 | conf->nodename, (const char *)rsi); |
1067 | conf->nodename, (const char *)rsi); |
874 | connectmode = conf_node::C_DISABLED; |
1068 | connectmode = conf_node::C_DISABLED; |
875 | } |
1069 | } |
876 | else if (connectmode == conf_node::C_ALWAYS) |
1070 | else if (connectmode == conf_node::C_ALWAYS) |
877 | establish_connection (); |
1071 | establish_connection (); |
… | |
… | |
879 | break; |
1073 | break; |
880 | |
1074 | |
881 | case vpn_packet::PT_AUTH_REQ: |
1075 | case vpn_packet::PT_AUTH_REQ: |
882 | if (auth_rate_limiter.can (rsi)) |
1076 | if (auth_rate_limiter.can (rsi)) |
883 | { |
1077 | { |
884 | auth_req_packet *p = (auth_req_packet *) pkt; |
1078 | auth_req_packet *p = (auth_req_packet *)pkt; |
885 | |
1079 | |
886 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1080 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1081 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1082 | p->protocols, p->features); |
887 | |
1083 | |
888 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1084 | if (p->chk_config () && !memcmp (p->magic, MAGIC, 8)) |
889 | { |
1085 | { |
890 | if (p->prot_minor != PROTOCOL_MINOR) |
1086 | if (p->prot_minor != PROTOCOL_MINOR) |
891 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1087 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
892 | conf->nodename, (const char *)rsi, |
1088 | conf->nodename, (const char *)rsi, |
893 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1089 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
894 | |
1090 | |
895 | if (p->initiate) |
1091 | if (p->initiate) |
896 | send_auth_request (rsi, false); |
1092 | send_auth_request (rsi, false); |
897 | |
1093 | |
898 | rsachallenge k; |
1094 | auth_data auth; |
899 | |
1095 | |
900 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
1096 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
901 | (unsigned char *)&p->encr, (unsigned char *)&k, |
1097 | { |
902 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
903 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
1098 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
904 | conf->nodename, (const char *)rsi); |
1099 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
1100 | } |
905 | else |
1101 | else |
906 | { |
1102 | { |
907 | delete octx; |
1103 | bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth); |
908 | |
1104 | |
909 | octx = new crypto_ctx (k, 1); |
1105 | rcv_auth = auth; |
910 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1106 | have_rcv_auth = true; |
911 | |
1107 | |
|
|
1108 | send_auth_response (rsi); |
|
|
1109 | |
|
|
1110 | if (chg) |
|
|
1111 | { |
912 | conf->protocols = p->protocols; |
1112 | conf->protocols = p->protocols; |
|
|
1113 | features = p->features & config_packet::get_features (); |
913 | |
1114 | |
914 | send_auth_response (rsi, p->id, k); |
|
|
915 | |
|
|
916 | connection_established (); |
1115 | connection_established (rsi); |
917 | |
|
|
918 | break; |
1116 | } |
919 | } |
1117 | } |
|
|
1118 | |
|
|
1119 | break; |
920 | } |
1120 | } |
|
|
1121 | else |
|
|
1122 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
|
|
1123 | conf->nodename, (const char *)rsi); |
921 | |
1124 | |
922 | send_reset (rsi); |
1125 | send_reset (rsi); |
923 | } |
1126 | } |
924 | |
1127 | |
925 | break; |
1128 | break; |
926 | |
1129 | |
927 | case vpn_packet::PT_AUTH_RES: |
1130 | case vpn_packet::PT_AUTH_RES: |
928 | { |
1131 | { |
929 | auth_res_packet *p = (auth_res_packet *) pkt; |
1132 | auth_res_packet *p = (auth_res_packet *)pkt; |
930 | |
1133 | |
931 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1134 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
932 | |
1135 | |
933 | if (p->chk_config ()) |
1136 | if (p->chk_config ()) |
934 | { |
1137 | { |
935 | if (p->prot_minor != PROTOCOL_MINOR) |
1138 | if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac))) |
936 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
937 | conf->nodename, (const char *)rsi, |
|
|
938 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
939 | |
|
|
940 | rsachallenge chg; |
|
|
941 | |
|
|
942 | if (!rsa_cache.find (p->id, chg)) |
|
|
943 | { |
1139 | { |
944 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
1140 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
945 | conf->nodename, (const char *)rsi); |
1141 | conf->nodename, (const char *)rsi); |
946 | break; |
|
|
947 | } |
1142 | } |
948 | else |
1143 | else if (!have_snd_auth) |
949 | { |
1144 | { |
950 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1145 | if (p->prot_minor != PROTOCOL_MINOR) |
951 | |
1146 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
952 | if (!p->hmac_chk (cctx)) |
|
|
953 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
954 | "could be an attack, or just corruption or an synchronization error"), |
|
|
955 | conf->nodename, (const char *)rsi); |
1147 | conf->nodename, (const char *)rsi, |
956 | else |
1148 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
957 | { |
|
|
958 | rsaresponse h; |
|
|
959 | |
1149 | |
960 | rsa_hash (p->id, chg, h); |
|
|
961 | |
|
|
962 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
963 | { |
|
|
964 | prot_minor = p->prot_minor; |
1150 | prot_minor = p->prot_minor; |
|
|
1151 | memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b)); |
965 | |
1152 | |
966 | delete ictx; ictx = cctx; |
1153 | have_snd_auth = true; |
967 | |
|
|
968 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
969 | |
|
|
970 | si = rsi; |
|
|
971 | protocol = rsi.prot; |
|
|
972 | |
|
|
973 | connection_established (); |
1154 | connection_established (rsi); |
974 | |
|
|
975 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
976 | conf->nodename, (const char *)rsi, |
|
|
977 | p->prot_major, p->prot_minor); |
|
|
978 | |
|
|
979 | if (::conf.script_node_up) |
|
|
980 | run_script (run_script_cb (this, &connection::script_node_up), false); |
|
|
981 | |
|
|
982 | break; |
|
|
983 | } |
|
|
984 | else |
|
|
985 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
986 | conf->nodename, (const char *)rsi); |
|
|
987 | } |
|
|
988 | |
|
|
989 | delete cctx; |
|
|
990 | } |
1155 | } |
|
|
1156 | |
|
|
1157 | break; |
991 | } |
1158 | } |
992 | } |
1159 | } |
993 | |
1160 | |
994 | send_reset (rsi); |
1161 | send_reset (rsi); |
995 | break; |
1162 | break; |
… | |
… | |
1006 | { |
1173 | { |
1007 | vpndata_packet *p = (vpndata_packet *)pkt; |
1174 | vpndata_packet *p = (vpndata_packet *)pkt; |
1008 | |
1175 | |
1009 | if (!p->hmac_chk (ictx)) |
1176 | if (!p->hmac_chk (ictx)) |
1010 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1177 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1011 | "could be an attack, or just corruption or an synchronization error"), |
1178 | "could be an attack, or just corruption or a synchronization error."), |
1012 | conf->nodename, (const char *)rsi); |
1179 | conf->nodename, (const char *)rsi); |
1013 | else |
1180 | else |
1014 | { |
1181 | { |
1015 | u32 seqno; |
1182 | u32 seqno; |
1016 | tap_packet *d = p->unpack (this, seqno); |
1183 | tap_packet *d = p->unpack (this, seqno); |
|
|
1184 | int seqclass = iseqno.seqno_classify (seqno); |
1017 | |
1185 | |
1018 | if (iseqno.recv_ok (seqno)) |
1186 | if (seqclass == 0) // ok |
1019 | { |
1187 | { |
1020 | vpn->tap->send (d); |
1188 | vpn->tap->send (d); |
1021 | |
1189 | |
1022 | if (p->dst () == 0) // re-broadcast |
|
|
1023 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
1024 | { |
|
|
1025 | connection *c = *i; |
|
|
1026 | |
|
|
1027 | if (c->conf != THISNODE && c->conf != conf) |
|
|
1028 | c->inject_data_packet (d); |
|
|
1029 | } |
|
|
1030 | |
|
|
1031 | if (si != rsi) |
1190 | if (si != rsi) |
1032 | { |
1191 | { |
1033 | // fast re-sync on conneciton changes, useful especially for tcp/ip |
1192 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1193 | //if (last_si_change < ev_now () + 5.) |
1034 | si = rsi; |
1194 | // { |
1035 | |
|
|
1036 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1195 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1037 | conf->nodename, (const char *)si, (const char *)rsi); |
1196 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1197 | |
|
|
1198 | si = rsi; |
|
|
1199 | |
|
|
1200 | if (::conf.script_node_change) |
|
|
1201 | { |
|
|
1202 | run_script_cb *cb = new run_script_cb; |
|
|
1203 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1204 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1205 | } |
|
|
1206 | |
|
|
1207 | // } |
|
|
1208 | //else |
|
|
1209 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1210 | // conf->nodename, (const char *)si, (const char *)rsi); |
1038 | } |
1211 | } |
1039 | |
|
|
1040 | delete d; |
|
|
1041 | |
|
|
1042 | break; |
|
|
1043 | } |
1212 | } |
|
|
1213 | else if (seqclass == 1) // far history |
|
|
1214 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1215 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1216 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1217 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1218 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1219 | else if (seqclass == 3) // reset |
|
|
1220 | { |
|
|
1221 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1222 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1223 | send_reset (rsi); |
|
|
1224 | } |
|
|
1225 | |
|
|
1226 | delete d; |
|
|
1227 | break; |
1044 | } |
1228 | } |
1045 | } |
1229 | } |
1046 | |
1230 | |
1047 | send_reset (rsi); |
1231 | send_reset (rsi); |
1048 | break; |
1232 | break; |
1049 | |
1233 | |
1050 | case vpn_packet::PT_CONNECT_REQ: |
1234 | case vpn_packet::PT_CONNECT_REQ: |
1051 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1235 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1052 | { |
1236 | { |
1053 | connect_req_packet *p = (connect_req_packet *) pkt; |
1237 | connect_req_packet *p = (connect_req_packet *)pkt; |
1054 | |
1238 | |
1055 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1239 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1056 | connection *c = vpn->conns[p->id - 1]; |
|
|
1057 | conf->protocols = p->protocols; |
|
|
1058 | |
|
|
1059 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1060 | conf->id, p->id, c->ictx && c->octx); |
|
|
1061 | |
|
|
1062 | if (c->ictx && c->octx) |
|
|
1063 | { |
1240 | { |
|
|
1241 | connection *c = vpn->conns[p->id - 1]; |
|
|
1242 | conf->protocols = p->protocols; |
|
|
1243 | |
|
|
1244 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1245 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1246 | p->protocols, |
|
|
1247 | c->ictx && c->octx); |
|
|
1248 | |
|
|
1249 | if (c->ictx && c->octx) |
|
|
1250 | { |
1064 | // send connect_info packets to both sides, in case one is |
1251 | // send connect_info packets to both sides, in case one is |
1065 | // behind a nat firewall (or both ;) |
1252 | // behind a nat firewall (or both ;) |
1066 | c->send_connect_info (conf->id, si, conf->protocols); |
1253 | c->send_connect_info (conf->id, si, conf->protocols); |
1067 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1254 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1255 | } |
|
|
1256 | else |
|
|
1257 | c->establish_connection (); |
1068 | } |
1258 | } |
1069 | else |
1259 | else |
1070 | c->establish_connection (); |
1260 | slog (L_WARN, |
|
|
1261 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1262 | p->id); |
1071 | } |
1263 | } |
1072 | |
1264 | |
1073 | break; |
1265 | break; |
1074 | |
1266 | |
1075 | case vpn_packet::PT_CONNECT_INFO: |
1267 | case vpn_packet::PT_CONNECT_INFO: |
1076 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1268 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1077 | { |
1269 | { |
1078 | connect_info_packet *p = (connect_info_packet *) pkt; |
1270 | connect_info_packet *p = (connect_info_packet *)pkt; |
1079 | |
1271 | |
1080 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1272 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1081 | |
1273 | { |
1082 | connection *c = vpn->conns[p->id - 1]; |
1274 | connection *c = vpn->conns[p->id - 1]; |
1083 | |
1275 | |
1084 | c->conf->protocols = p->protocols; |
1276 | c->conf->protocols = p->protocols; |
1085 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1277 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1086 | p->si.upgrade_protocol (protocol, c->conf); |
1278 | p->si.upgrade_protocol (protocol, c->conf); |
1087 | |
1279 | |
1088 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1280 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1089 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1281 | conf->nodename, |
|
|
1282 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1283 | (const char *)p->si, |
|
|
1284 | p->protocols, |
|
|
1285 | protocol, |
|
|
1286 | p->si.supported_protocols (c->conf), |
|
|
1287 | !c->ictx && !c->octx); |
1090 | |
1288 | |
1091 | const sockinfo &dsi = forward_si (p->si); |
1289 | const sockinfo &dsi = forward_si (p->si); |
1092 | |
1290 | |
1093 | if (dsi.valid ()) |
1291 | if (dsi.valid ()) |
1094 | c->send_auth_request (dsi, true); |
1292 | c->send_auth_request (dsi, true); |
|
|
1293 | else |
|
|
1294 | slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
|
|
1295 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1296 | (const char *)p->si); |
|
|
1297 | } |
|
|
1298 | else |
|
|
1299 | slog (L_WARN, |
|
|
1300 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1301 | p->id); |
1095 | } |
1302 | } |
1096 | |
1303 | |
1097 | break; |
1304 | break; |
1098 | |
1305 | |
1099 | default: |
1306 | default: |
1100 | send_reset (rsi); |
1307 | send_reset (rsi); |
1101 | break; |
1308 | break; |
1102 | } |
1309 | } |
1103 | } |
1310 | } |
1104 | |
1311 | |
1105 | void connection::keepalive_cb (time_watcher &w) |
1312 | inline void |
|
|
1313 | connection::keepalive_cb (ev::timer &w, int revents) |
1106 | { |
1314 | { |
1107 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1315 | ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
|
|
1316 | |
|
|
1317 | if (when >= 0) |
|
|
1318 | w.start (when); |
|
|
1319 | else if (when < -15) |
1108 | { |
1320 | { |
1109 | reset_connection (); |
1321 | reset_connection (); |
1110 | establish_connection (); |
1322 | establish_connection (); |
1111 | } |
1323 | } |
1112 | else if (NOW < last_activity + ::conf.keepalive) |
|
|
1113 | w.at = last_activity + ::conf.keepalive; |
|
|
1114 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1324 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1115 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1325 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1116 | { |
1326 | { |
|
|
1327 | w.start (3); |
1117 | send_ping (si); |
1328 | send_ping (si); |
1118 | w.at = NOW + 5; |
|
|
1119 | } |
1329 | } |
1120 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1330 | else if (when >= -10) |
1121 | // hold ondemand connections implicitly a few seconds longer |
1331 | // hold ondemand connections implicitly a few seconds longer |
1122 | // should delete octx, though, or something like that ;) |
1332 | // should delete octx, though, or something like that ;) |
1123 | w.at = last_activity + ::conf.keepalive + 10; |
1333 | w.start (when + 10); |
1124 | else |
1334 | else |
1125 | reset_connection (); |
1335 | reset_connection (); |
1126 | } |
1336 | } |
1127 | |
1337 | |
|
|
1338 | void |
1128 | void connection::send_connect_request (int id) |
1339 | connection::send_connect_request (int id) |
1129 | { |
1340 | { |
1130 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1341 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1131 | |
1342 | |
1132 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1343 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1344 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1345 | THISNODE->protocols); |
1133 | p->hmac_set (octx); |
1346 | p->hmac_set (octx); |
1134 | send_vpn_packet (p, si); |
1347 | send_vpn_packet (p, si); |
1135 | |
1348 | |
1136 | delete p; |
1349 | delete p; |
1137 | } |
1350 | } |
1138 | |
1351 | |
1139 | void connection::script_node () |
1352 | void |
|
|
1353 | connection::script_init_env (const char *ext) |
1140 | { |
1354 | { |
1141 | vpn->script_if_up (); |
|
|
1142 | |
|
|
1143 | char *env; |
1355 | char *env; |
|
|
1356 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1357 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1358 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1359 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1360 | conf->id & 0xff); putenv (env); |
|
|
1361 | } |
|
|
1362 | |
|
|
1363 | void |
|
|
1364 | connection::script_init_connect_env () |
|
|
1365 | { |
|
|
1366 | vpn->script_init_env (); |
|
|
1367 | |
|
|
1368 | char *env; |
1144 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1369 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1370 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1145 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1371 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1146 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1372 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1147 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1373 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1148 | } |
1374 | } |
1149 | |
1375 | |
|
|
1376 | inline const char * |
1150 | const char *connection::script_node_up () |
1377 | connection::script_node_up () |
1151 | { |
1378 | { |
1152 | script_node (); |
1379 | script_init_connect_env (); |
1153 | |
1380 | |
1154 | putenv ("STATE=up"); |
1381 | putenv ((char *)"STATE=up"); |
1155 | |
1382 | |
|
|
1383 | char *filename; |
|
|
1384 | asprintf (&filename, |
|
|
1385 | "%s/%s", |
|
|
1386 | confbase, |
1156 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1387 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1157 | } |
|
|
1158 | |
1388 | |
|
|
1389 | return filename; |
|
|
1390 | } |
|
|
1391 | |
|
|
1392 | inline const char * |
|
|
1393 | connection::script_node_change () |
|
|
1394 | { |
|
|
1395 | script_init_connect_env (); |
|
|
1396 | |
|
|
1397 | putenv ((char *)"STATE=change"); |
|
|
1398 | |
|
|
1399 | char *filename; |
|
|
1400 | asprintf (&filename, |
|
|
1401 | "%s/%s", |
|
|
1402 | confbase, |
|
|
1403 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
|
|
1404 | |
|
|
1405 | return filename; |
|
|
1406 | } |
|
|
1407 | |
|
|
1408 | inline const char * |
1159 | const char *connection::script_node_down () |
1409 | connection::script_node_down () |
1160 | { |
1410 | { |
1161 | script_node (); |
1411 | script_init_connect_env (); |
1162 | |
1412 | |
1163 | putenv ("STATE=down"); |
1413 | putenv ((char *)"STATE=down"); |
1164 | |
1414 | |
1165 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1415 | char *filename; |
1166 | } |
1416 | asprintf (&filename, |
|
|
1417 | "%s/%s", |
|
|
1418 | confbase, |
|
|
1419 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1167 | |
1420 | |
|
|
1421 | return filename; |
|
|
1422 | } |
|
|
1423 | |
1168 | connection::connection(struct vpn *vpn_) |
1424 | connection::connection (struct vpn *vpn, conf_node *conf) |
1169 | : vpn(vpn_) |
1425 | : vpn(vpn), conf(conf), |
1170 | , rekey (this, &connection::rekey_cb) |
1426 | #if ENABLE_DNS |
1171 | , keepalive (this, &connection::keepalive_cb) |
1427 | dns (0), |
|
|
1428 | #endif |
|
|
1429 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1430 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
|
|
1431 | { |
|
|
1432 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1433 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1172 | , establish_connection (this, &connection::establish_connection_cb) |
1434 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1173 | { |
1435 | |
|
|
1436 | last_establish_attempt = 0.; |
1174 | octx = ictx = 0; |
1437 | octx = ictx = 0; |
1175 | retry_cnt = 0; |
|
|
1176 | |
1438 | |
1177 | connectmode = conf_node::C_ALWAYS; // initial setting |
1439 | connectmode = conf->connectmode; |
|
|
1440 | |
|
|
1441 | // queue a dummy packet to force an initial connection attempt |
|
|
1442 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1443 | vpn_queue.put (new net_packet); |
|
|
1444 | |
1178 | reset_connection (); |
1445 | reset_connection (); |
1179 | } |
1446 | } |
1180 | |
1447 | |
1181 | connection::~connection () |
1448 | connection::~connection () |
1182 | { |
1449 | { |
1183 | shutdown (); |
1450 | shutdown (); |
1184 | } |
1451 | } |
1185 | |
1452 | |
|
|
1453 | void |
1186 | void connection_init () |
1454 | connection_init () |
1187 | { |
1455 | { |
1188 | auth_rate_limiter.clear (); |
1456 | auth_rate_limiter.clear (); |
1189 | reset_rate_limiter.clear (); |
1457 | reset_rate_limiter.clear (); |
1190 | } |
1458 | } |
1191 | |
1459 | |