1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | 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 |
9 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
10 | (at your option) any later version. |
10 | option) any later version. |
11 | |
11 | |
12 | 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 |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
15 | GNU General Public License for more details. |
15 | Public License for more details. |
16 | |
16 | |
17 | 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 |
18 | along with gvpe; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
19 | 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. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #include <cassert> |
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25 | |
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26 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
27 | |
37 | |
28 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
29 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
30 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
31 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
32 | |
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33 | #include "gettext.h" |
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34 | |
42 | |
35 | #include "conf.h" |
43 | #include "conf.h" |
36 | #include "slog.h" |
44 | #include "slog.h" |
37 | #include "device.h" |
45 | #include "device.h" |
38 | #include "vpn.h" |
46 | #include "vpn.h" |
39 | #include "connection.h" |
47 | #include "connection.h" |
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48 | #include "hkdf.h" |
40 | |
49 | |
41 | #include "netcompat.h" |
50 | #include "netcompat.h" |
42 | |
51 | |
43 | #if !HAVE_RAND_PSEUDO_BYTES |
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44 | # define RAND_pseudo_bytes RAND_bytes |
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45 | #endif |
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46 | |
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47 | #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 | #define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D |
48 | |
54 | |
49 | #define ULTRA_FAST 1 |
55 | #define ULTRA_FAST 1 |
50 | #define HLOG 15 |
56 | #define HLOG 15 |
51 | #include "lzf/lzf.h" |
57 | #include "lzf/lzf.h" |
52 | #include "lzf/lzf_c.c" |
58 | #include "lzf/lzf_c.c" |
53 | #include "lzf/lzf_d.c" |
59 | #include "lzf/lzf_d.c" |
54 | |
60 | |
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61 | ////////////////////////////////////////////////////////////////////////////// |
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62 | |
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63 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
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64 | static ev::child rs_child_ev; |
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65 | |
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66 | namespace |
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67 | { |
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68 | void // c++ requires external linkage here, apparently :( |
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69 | rs_child_cb (ev::child &w, int revents) |
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70 | { |
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71 | w.stop (); |
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72 | |
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73 | if (rs_queue.empty ()) |
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74 | return; |
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75 | |
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76 | pid_t pid = run_script (*rs_queue.front ().first, false); |
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77 | if (pid) |
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78 | { |
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79 | w.set (pid); |
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80 | w.start (); |
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81 | } |
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82 | else |
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83 | slog (L_WARN, rs_queue.front ().second); |
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84 | |
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85 | delete rs_queue.front ().first; |
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86 | rs_queue.pop (); |
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87 | } |
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88 | }; |
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89 | |
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90 | // despite the fancy name, this is quite a hack |
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91 | static void |
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92 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
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93 | { |
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94 | rs_queue.push (std::make_pair (cb, warnmsg)); |
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95 | |
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96 | if (!rs_child_ev.is_active ()) |
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97 | { |
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98 | rs_child_ev.set<rs_child_cb> (); |
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99 | rs_child_ev (); |
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100 | } |
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101 | } |
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102 | |
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103 | ////////////////////////////////////////////////////////////////////////////// |
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104 | |
55 | struct crypto_ctx |
105 | struct crypto_ctx |
56 | { |
106 | { |
57 | EVP_CIPHER_CTX cctx; |
107 | EVP_CIPHER_CTX cctx; |
58 | HMAC_CTX hctx; |
108 | HMAC_CTX hctx; |
59 | |
109 | |
60 | crypto_ctx (const rsachallenge &challenge, int enc); |
110 | crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc); |
61 | ~crypto_ctx (); |
111 | ~crypto_ctx (); |
62 | }; |
112 | }; |
63 | |
113 | |
64 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
114 | crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc) |
65 | { |
115 | { |
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116 | ecdh_key s; |
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117 | |
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118 | curve25519_combine (a, b, s); |
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119 | |
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120 | { |
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121 | u8 mac_key[MAC_KEYSIZE]; |
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122 | static const unsigned char mac_info[] = "gvpe mac key"; |
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123 | |
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124 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
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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 (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 | |
66 | EVP_CIPHER_CTX_init (&cctx); |
144 | EVP_CIPHER_CTX_init (&cctx); |
67 | 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)); |
68 | HMAC_CTX_init (&hctx); |
146 | } |
69 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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70 | } |
147 | } |
71 | |
148 | |
72 | crypto_ctx::~crypto_ctx () |
149 | crypto_ctx::~crypto_ctx () |
73 | { |
150 | { |
74 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
151 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
75 | HMAC_CTX_cleanup (&hctx); |
152 | HMAC_CTX_cleanup (&hctx); |
76 | } |
153 | } |
77 | |
154 | |
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155 | static inline void |
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156 | auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr) |
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157 | { |
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158 | if (RSA_public_encrypt (sizeof (auth.rsa), |
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159 | (unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa, |
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160 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
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161 | fatal ("RSA_public_encrypt error"); |
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162 | |
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163 | memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh)); |
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164 | } |
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165 | |
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166 | static inline bool |
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167 | auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth) |
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168 | { |
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169 | u8 rsa_decrypt[RSA_KEYLEN]; |
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170 | |
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171 | if (RSA_private_decrypt (sizeof (encr.rsa), |
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172 | (const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt, |
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173 | key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa)) |
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174 | return 0; |
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175 | |
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176 | memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa)); |
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177 | memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh)); |
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178 | |
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179 | return 1; |
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180 | } |
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181 | |
78 | static void |
182 | static void |
79 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
183 | auth_hash (const auth_data &auth, auth_mac &mac) |
80 | { |
184 | { |
81 | EVP_MD_CTX ctx; |
185 | HMAC_CTX ctx; |
82 | |
186 | |
83 | EVP_MD_CTX_init (&ctx); |
187 | HMAC_CTX_init (&ctx); |
84 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
188 | require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0)); |
85 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
189 | require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth)); |
86 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
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87 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
190 | require (HMAC_Final (&ctx, (unsigned char *)&mac, 0)); |
88 | EVP_MD_CTX_cleanup (&ctx); |
191 | HMAC_CTX_cleanup (&ctx); |
89 | } |
192 | } |
90 | |
193 | |
91 | struct rsa_entry { |
194 | void |
92 | tstamp expire; |
195 | connection::generate_auth_data () |
93 | rsaid id; |
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94 | rsachallenge chg; |
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95 | }; |
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96 | |
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97 | struct rsa_cache : list<rsa_entry> |
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98 | { |
196 | { |
99 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
197 | if (auth_expire < ev_now ()) |
100 | |
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101 | bool find (const rsaid &id, rsachallenge &chg) |
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102 | { |
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103 | for (iterator i = begin (); i != end (); ++i) |
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104 | { |
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105 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
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106 | { |
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107 | memcpy (&chg, &i->chg, sizeof chg); |
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108 | |
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109 | erase (i); |
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110 | return true; |
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111 | } |
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112 | } |
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113 | |
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114 | if (cleaner.at < NOW) |
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115 | cleaner.start (NOW + RSA_TTL); |
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116 | |
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117 | return false; |
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118 | } |
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119 | |
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120 | void gen (rsaid &id, rsachallenge &chg) |
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121 | { |
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122 | rsa_entry e; |
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123 | |
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124 | RAND_bytes ((unsigned char *)&id, sizeof id); |
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125 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
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126 | |
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127 | e.expire = NOW + RSA_TTL; |
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128 | e.id = id; |
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129 | memcpy (&e.chg, &chg, sizeof chg); |
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130 | |
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131 | push_back (e); |
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132 | |
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133 | if (cleaner.at < NOW) |
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134 | cleaner.start (NOW + RSA_TTL); |
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135 | } |
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136 | |
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137 | rsa_cache () |
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138 | : cleaner (this, &rsa_cache::cleaner_cb) |
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139 | { } |
198 | { |
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199 | // request data |
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200 | rand_fill (snd_auth.rsa); |
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201 | curve25519_generate (snd_ecdh_a, snd_auth.ecdh); |
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202 | auth_hash (snd_auth, snd_auth_mac); |
140 | |
203 | |
141 | } rsa_cache; |
204 | // eventual response data |
142 | |
205 | curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); |
143 | void rsa_cache::cleaner_cb (time_watcher &w) |
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144 | { |
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145 | if (!empty ()) |
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146 | { |
206 | } |
147 | w.start (NOW + RSA_TTL); |
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148 | |
207 | |
149 | for (iterator i = begin (); i != end (); ) |
208 | // every use prolongs the expiry |
150 | if (i->expire <= NOW) |
209 | auth_expire = ev_now () + AUTH_TTL; |
151 | i = erase (i); |
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152 | else |
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153 | ++i; |
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154 | } |
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155 | } |
210 | } |
156 | |
211 | |
157 | ////////////////////////////////////////////////////////////////////////////// |
212 | ////////////////////////////////////////////////////////////////////////////// |
158 | |
213 | |
159 | void pkt_queue::put (net_packet *p) |
214 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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215 | : max_ttl (max_ttl), max_queue (max_queue) |
160 | { |
216 | { |
161 | if (queue[i]) |
217 | queue = new pkt [max_queue]; |
162 | { |
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163 | delete queue[i]; |
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164 | j = (j + 1) % QUEUEDEPTH; |
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165 | } |
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166 | |
218 | |
167 | queue[i] = p; |
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168 | |
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169 | i = (i + 1) % QUEUEDEPTH; |
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170 | } |
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171 | |
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172 | net_packet *pkt_queue::get () |
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173 | { |
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174 | net_packet *p = queue[j]; |
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175 | |
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176 | if (p) |
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177 | { |
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178 | queue[j] = 0; |
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179 | j = (j + 1) % QUEUEDEPTH; |
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180 | } |
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181 | |
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182 | return p; |
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183 | } |
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184 | |
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185 | pkt_queue::pkt_queue () |
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186 | { |
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187 | memset (queue, 0, sizeof (queue)); |
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188 | i = 0; |
219 | i = 0; |
189 | j = 0; |
220 | j = 0; |
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221 | |
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222 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
190 | } |
223 | } |
191 | |
224 | |
192 | pkt_queue::~pkt_queue () |
225 | pkt_queue::~pkt_queue () |
193 | { |
226 | { |
194 | for (i = QUEUEDEPTH; --i > 0; ) |
227 | while (net_packet *p = get ()) |
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228 | delete p; |
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229 | |
195 | delete queue[i]; |
230 | delete [] queue; |
196 | } |
231 | } |
197 | |
232 | |
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233 | void |
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234 | pkt_queue::expire_cb (ev::timer &w, int revents) |
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235 | { |
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236 | ev_tstamp expire = ev_now () - max_ttl; |
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237 | |
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238 | for (;;) |
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239 | { |
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240 | if (empty ()) |
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241 | break; |
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242 | |
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243 | double diff = queue[j].tstamp - expire; |
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244 | |
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245 | if (diff >= 0.) |
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246 | { |
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247 | w.start (diff > 0.5 ? diff : 0.5); |
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248 | break; |
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249 | } |
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250 | |
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251 | delete get (); |
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252 | } |
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253 | } |
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254 | |
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255 | void |
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256 | pkt_queue::put (net_packet *p) |
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257 | { |
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258 | ev_tstamp now = ev_now (); |
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259 | |
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260 | // start expiry timer |
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261 | if (empty ()) |
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262 | expire.start (max_ttl); |
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263 | |
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264 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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265 | |
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266 | if (ni == j) |
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267 | delete get (); |
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268 | |
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269 | queue[i].pkt = p; |
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270 | queue[i].tstamp = now; |
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271 | |
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272 | i = ni; |
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273 | } |
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274 | |
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275 | net_packet * |
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276 | pkt_queue::get () |
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277 | { |
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278 | if (empty ()) |
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279 | return 0; |
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280 | |
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281 | net_packet *p = queue[j].pkt; |
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282 | queue[j].pkt = 0; |
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283 | |
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284 | j = j + 1 == max_queue ? 0 : j + 1; |
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285 | |
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286 | return p; |
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287 | } |
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288 | |
198 | struct net_rateinfo { |
289 | struct net_rateinfo |
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290 | { |
199 | u32 host; |
291 | u32 host; |
200 | double pcnt, diff; |
292 | double pcnt, diff; |
201 | tstamp last; |
293 | tstamp last; |
202 | }; |
294 | }; |
203 | |
295 | |
… | |
… | |
213 | |
305 | |
214 | bool can (const sockinfo &si) { return can((u32)si.host); } |
306 | bool can (const sockinfo &si) { return can((u32)si.host); } |
215 | bool can (u32 host); |
307 | bool can (u32 host); |
216 | }; |
308 | }; |
217 | |
309 | |
218 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
310 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
219 | |
311 | |
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312 | bool |
220 | bool net_rate_limiter::can (u32 host) |
313 | net_rate_limiter::can (u32 host) |
221 | { |
314 | { |
222 | iterator i; |
315 | iterator i; |
223 | |
316 | |
224 | for (i = begin (); i != end (); ) |
317 | for (i = begin (); i != end (); ) |
225 | if (i->host == host) |
318 | if (i->host == host) |
226 | break; |
319 | break; |
227 | else if (i->last < NOW - NRL_EXPIRE) |
320 | else if (i->last < ev_now () - NRL_EXPIRE) |
228 | i = erase (i); |
321 | i = erase (i); |
229 | else |
322 | else |
230 | i++; |
323 | i++; |
231 | |
324 | |
232 | if (i == end ()) |
325 | if (i == end ()) |
… | |
… | |
234 | net_rateinfo ri; |
327 | net_rateinfo ri; |
235 | |
328 | |
236 | ri.host = host; |
329 | ri.host = host; |
237 | ri.pcnt = 1.; |
330 | ri.pcnt = 1.; |
238 | ri.diff = NRL_MAXDIF; |
331 | ri.diff = NRL_MAXDIF; |
239 | ri.last = NOW; |
332 | ri.last = ev_now (); |
240 | |
333 | |
241 | push_front (ri); |
334 | push_front (ri); |
242 | |
335 | |
243 | return true; |
336 | return true; |
244 | } |
337 | } |
… | |
… | |
246 | { |
339 | { |
247 | net_rateinfo ri (*i); |
340 | net_rateinfo ri (*i); |
248 | erase (i); |
341 | erase (i); |
249 | |
342 | |
250 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
343 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
251 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
344 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
252 | |
345 | |
253 | ri.last = NOW; |
346 | ri.last = ev_now (); |
254 | |
347 | |
255 | double dif = ri.diff / ri.pcnt; |
348 | double dif = ri.diff / ri.pcnt; |
256 | |
349 | |
257 | bool send = dif > NRL_CUTOFF; |
350 | bool send = dif > NRL_CUTOFF; |
258 | |
351 | |
… | |
… | |
272 | |
365 | |
273 | ///////////////////////////////////////////////////////////////////////////// |
366 | ///////////////////////////////////////////////////////////////////////////// |
274 | |
367 | |
275 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
368 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
276 | |
369 | |
|
|
370 | void |
277 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
371 | hmac_packet::hmac_gen (crypto_ctx *ctx) |
278 | { |
372 | { |
279 | unsigned int xlen; |
373 | unsigned int xlen; |
280 | |
374 | |
281 | HMAC_CTX *hctx = &ctx->hctx; |
375 | HMAC_CTX *hctx = &ctx->hctx; |
282 | |
376 | |
283 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
377 | require (HMAC_Init_ex (hctx, 0, 0, 0, 0)); |
284 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
378 | require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
285 | len - sizeof (hmac_packet)); |
379 | len - sizeof (hmac_packet))); |
286 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
380 | require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen)); |
287 | } |
381 | } |
288 | |
382 | |
289 | void |
383 | void |
290 | hmac_packet::hmac_set (crypto_ctx *ctx) |
384 | hmac_packet::hmac_set (crypto_ctx *ctx) |
291 | { |
385 | { |
… | |
… | |
300 | hmac_gen (ctx); |
394 | hmac_gen (ctx); |
301 | |
395 | |
302 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
396 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
303 | } |
397 | } |
304 | |
398 | |
|
|
399 | void |
305 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
400 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
306 | { |
401 | { |
307 | type = type_; |
402 | type = type_; |
308 | |
403 | |
309 | int src = THISNODE->id; |
404 | int src = THISNODE->id; |
310 | |
405 | |
… | |
… | |
315 | |
410 | |
316 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
411 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
317 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
412 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
318 | |
413 | |
319 | struct vpndata_packet : vpn_packet |
414 | struct vpndata_packet : vpn_packet |
|
|
415 | { |
|
|
416 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
417 | |
|
|
418 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
419 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
420 | |
|
|
421 | private: |
|
|
422 | const u32 data_hdr_size () const |
320 | { |
423 | { |
321 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
322 | |
|
|
323 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
324 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
325 | private: |
|
|
326 | |
|
|
327 | const u32 data_hdr_size () const |
|
|
328 | { |
|
|
329 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
424 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
330 | } |
|
|
331 | }; |
425 | } |
|
|
426 | }; |
332 | |
427 | |
333 | void |
428 | void |
334 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
429 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
335 | { |
430 | { |
336 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
431 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
… | |
… | |
338 | ptype type = PT_DATA_UNCOMPRESSED; |
433 | ptype type = PT_DATA_UNCOMPRESSED; |
339 | |
434 | |
340 | #if ENABLE_COMPRESSION |
435 | #if ENABLE_COMPRESSION |
341 | u8 cdata[MAX_MTU]; |
436 | u8 cdata[MAX_MTU]; |
342 | |
437 | |
343 | if (conn->features & ENABLE_COMPRESSION) |
438 | if (conn->features & FEATURE_COMPRESSION) |
344 | { |
439 | { |
345 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
440 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
346 | |
441 | |
347 | if (cl) |
442 | if (cl) |
348 | { |
443 | { |
… | |
… | |
354 | d[1] = cl; |
449 | d[1] = cl; |
355 | } |
450 | } |
356 | } |
451 | } |
357 | #endif |
452 | #endif |
358 | |
453 | |
359 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
454 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1)); |
360 | |
455 | |
361 | struct { |
456 | struct { |
362 | #if RAND_SIZE |
457 | #if RAND_SIZE |
363 | u8 rnd[RAND_SIZE]; |
458 | u8 rnd[RAND_SIZE]; |
364 | #endif |
459 | #endif |
365 | u32 seqno; |
460 | u32 seqno; |
366 | } datahdr; |
461 | } datahdr; |
367 | |
462 | |
368 | datahdr.seqno = ntohl (seqno); |
463 | datahdr.seqno = ntohl (seqno); |
369 | #if RAND_SIZE |
464 | #if RAND_SIZE |
370 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
465 | // NB: a constant (per session) random prefix |
|
|
466 | // is likely enough, but we don't take any chances. |
|
|
467 | conn->oiv.get (datahdr.rnd, RAND_SIZE); |
371 | #endif |
468 | #endif |
372 | |
469 | |
373 | require (EVP_EncryptUpdate (cctx, |
470 | require (EVP_EncryptUpdate (cctx, |
374 | (unsigned char *) data + outl, &outl2, |
471 | (unsigned char *) data + outl, &outl2, |
375 | (unsigned char *) &datahdr, DATAHDR)); |
472 | (unsigned char *) &datahdr, DATAHDR)); |
… | |
… | |
397 | int outl = 0, outl2; |
494 | int outl = 0, outl2; |
398 | tap_packet *p = new tap_packet; |
495 | tap_packet *p = new tap_packet; |
399 | u8 *d; |
496 | u8 *d; |
400 | u32 l = len - data_hdr_size (); |
497 | u32 l = len - data_hdr_size (); |
401 | |
498 | |
402 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
499 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0)); |
403 | |
500 | |
404 | #if ENABLE_COMPRESSION |
501 | #if ENABLE_COMPRESSION |
405 | u8 cdata[MAX_MTU]; |
502 | u8 cdata[MAX_MTU]; |
406 | |
503 | |
407 | if (type == PT_DATA_COMPRESSED) |
504 | if (type == PT_DATA_COMPRESSED) |
408 | d = cdata; |
505 | d = cdata; |
409 | else |
506 | else |
410 | #endif |
507 | #endif |
411 | d = &(*p)[6 + 6 - DATAHDR]; |
508 | d = &(*p)[6 + 6] - DATAHDR; |
412 | |
509 | |
413 | /* this overwrites part of the src mac, but we fix that later */ |
510 | // we play do evil games with the struct layout atm. |
|
|
511 | // pending better solutions, we at least do some verification. |
|
|
512 | // this is fine, as we left ISO territory long ago. |
|
|
513 | require (DATAHDR <= 16); |
|
|
514 | require ((u8 *)(&p->len + 1) == &(*p)[0]); |
|
|
515 | |
|
|
516 | // this can overwrite the len/dst/src fields |
414 | require (EVP_DecryptUpdate (cctx, |
517 | require (EVP_DecryptUpdate (cctx, |
415 | d, &outl2, |
518 | d, &outl2, |
416 | (unsigned char *)&data, len - data_hdr_size ())); |
519 | (unsigned char *)&data, len - data_hdr_size ())); |
417 | outl += outl2; |
520 | outl += outl2; |
418 | |
521 | |
… | |
… | |
449 | } |
552 | } |
450 | }; |
553 | }; |
451 | |
554 | |
452 | struct config_packet : vpn_packet |
555 | struct config_packet : vpn_packet |
453 | { |
556 | { |
454 | // actually, hmaclen cannot be checked because the hmac |
|
|
455 | // field comes before this data, so peers with other |
|
|
456 | // hmacs simply will not work. |
|
|
457 | u8 prot_major, prot_minor, randsize, hmaclen; |
557 | u8 prot_major, prot_minor, randsize; |
458 | u8 flags, challengelen, features, pad3; |
558 | u8 flags, features, pad6, pad7, pad8; |
459 | u32 cipher_nid, digest_nid, hmac_nid; |
559 | u32 cipher_nid, mac_nid, auth_nid; |
460 | |
560 | |
461 | void setup (ptype type, int dst); |
561 | void setup (ptype type, int dst); |
462 | bool chk_config () const; |
562 | bool chk_config () const; |
463 | |
563 | |
464 | static u8 get_features () |
564 | static u8 get_features () |
… | |
… | |
468 | f |= FEATURE_COMPRESSION; |
568 | f |= FEATURE_COMPRESSION; |
469 | #endif |
569 | #endif |
470 | #if ENABLE_ROHC |
570 | #if ENABLE_ROHC |
471 | f |= FEATURE_ROHC; |
571 | f |= FEATURE_ROHC; |
472 | #endif |
572 | #endif |
|
|
573 | #if ENABLE_BRIDGING |
|
|
574 | f |= FEATURE_BRIDGING; |
|
|
575 | #endif |
473 | return f; |
576 | return f; |
474 | } |
577 | } |
475 | }; |
578 | }; |
476 | |
579 | |
|
|
580 | void |
477 | void config_packet::setup (ptype type, int dst) |
581 | config_packet::setup (ptype type, int dst) |
478 | { |
582 | { |
479 | prot_major = PROTOCOL_MAJOR; |
583 | prot_major = PROTOCOL_MAJOR; |
480 | prot_minor = PROTOCOL_MINOR; |
584 | prot_minor = PROTOCOL_MINOR; |
481 | randsize = RAND_SIZE; |
585 | randsize = RAND_SIZE; |
482 | hmaclen = HMACLENGTH; |
|
|
483 | flags = 0; |
586 | flags = 0; |
484 | challengelen = sizeof (rsachallenge); |
|
|
485 | features = get_features (); |
587 | features = get_features (); |
486 | |
588 | |
487 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
589 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); |
488 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
|
|
489 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
590 | mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); |
|
|
591 | auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); |
490 | |
592 | |
491 | len = sizeof (*this) - sizeof (net_packet); |
593 | len = sizeof (*this) - sizeof (net_packet); |
492 | set_hdr (type, dst); |
594 | set_hdr (type, dst); |
493 | } |
595 | } |
494 | |
596 | |
|
|
597 | bool |
495 | bool config_packet::chk_config () const |
598 | config_packet::chk_config () const |
496 | { |
599 | { |
497 | if (prot_major != PROTOCOL_MAJOR) |
600 | if (prot_major != PROTOCOL_MAJOR) |
498 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
601 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
499 | else if (randsize != RAND_SIZE) |
602 | else if (randsize != RAND_SIZE) |
500 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
603 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
501 | else if (hmaclen != HMACLENGTH) |
|
|
502 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
503 | else if (challengelen != sizeof (rsachallenge)) |
|
|
504 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
|
|
505 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
604 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ()))) |
506 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
605 | slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ())); |
507 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
|
|
508 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
|
|
509 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
606 | else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ()))) |
510 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
607 | slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); |
|
|
608 | else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) |
|
|
609 | slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); |
511 | else |
610 | else |
512 | return true; |
611 | return true; |
513 | |
612 | |
514 | return false; |
613 | return false; |
515 | } |
614 | } |
516 | |
615 | |
517 | struct auth_req_packet : config_packet |
616 | struct auth_req_packet : config_packet // UNPROTECTED |
518 | { |
617 | { |
519 | char magic[8]; |
618 | char magic[8]; |
520 | u8 initiate; // false if this is just an automatic reply |
619 | u8 initiate; // false if this is just an automatic reply |
521 | u8 protocols; // supported protocols (will be patched on forward) |
620 | u8 protocols; // supported protocols (will be patched on forward) |
522 | u8 pad2, pad3; |
621 | u8 pad2, pad3; |
523 | rsaid id; |
622 | auth_encr encr; |
524 | rsaencrdata encr; |
|
|
525 | |
623 | |
526 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
624 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
527 | { |
625 | { |
528 | config_packet::setup (PT_AUTH_REQ, dst); |
626 | config_packet::setup (PT_AUTH_REQ, dst); |
529 | strncpy (magic, MAGIC, 8); |
627 | memcpy (magic, MAGIC, 8); |
530 | initiate = !!initiate_; |
628 | initiate = !!initiate_; |
531 | protocols = protocols_; |
629 | protocols = protocols_; |
532 | |
630 | |
533 | len = sizeof (*this) - sizeof (net_packet); |
631 | len = sizeof (*this) - sizeof (net_packet); |
534 | } |
632 | } |
535 | }; |
633 | }; |
536 | |
634 | |
537 | struct auth_res_packet : config_packet |
635 | struct auth_res_packet : config_packet // UNPROTECTED |
538 | { |
636 | { |
539 | rsaid id; |
|
|
540 | u8 pad1, pad2, pad3; |
|
|
541 | u8 response_len; // encrypted length |
|
|
542 | rsaresponse response; |
637 | auth_response response; |
543 | |
638 | |
544 | auth_res_packet (int dst) |
639 | auth_res_packet (int dst) |
545 | { |
640 | { |
546 | config_packet::setup (PT_AUTH_RES, dst); |
641 | config_packet::setup (PT_AUTH_RES, dst); |
547 | |
642 | |
… | |
… | |
581 | }; |
676 | }; |
582 | |
677 | |
583 | ///////////////////////////////////////////////////////////////////////////// |
678 | ///////////////////////////////////////////////////////////////////////////// |
584 | |
679 | |
585 | void |
680 | void |
586 | connection::connection_established () |
681 | connection::connection_established (const sockinfo &rsi) |
587 | { |
682 | { |
|
|
683 | if (!have_snd_auth || !have_rcv_auth) |
|
|
684 | return; |
|
|
685 | |
|
|
686 | si = rsi; |
|
|
687 | protocol = rsi.prot; |
|
|
688 | |
|
|
689 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
690 | conf->nodename, (const char *)rsi, |
|
|
691 | is_direct ? "direct" : "forwarded", |
|
|
692 | PROTOCOL_MAJOR, prot_minor); |
|
|
693 | |
|
|
694 | if (::conf.script_node_up) |
|
|
695 | { |
|
|
696 | run_script_cb *cb = new run_script_cb; |
|
|
697 | cb->set<connection, &connection::script_node_up> (this); |
|
|
698 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
699 | } |
|
|
700 | |
|
|
701 | delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0); |
|
|
702 | iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); |
|
|
703 | |
|
|
704 | delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); |
|
|
705 | oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; |
|
|
706 | |
|
|
707 | oiv.reset (); |
|
|
708 | |
|
|
709 | // make sure rekeying timeouts are slightly asymmetric |
|
|
710 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
|
|
711 | rekey.start (rekey_interval, rekey_interval); |
|
|
712 | |
|
|
713 | keepalive.start (::conf.keepalive); |
|
|
714 | |
|
|
715 | // send queued packets |
588 | if (ictx && octx) |
716 | if (ictx && octx) |
589 | { |
717 | { |
590 | connectmode = conf->connectmode; |
718 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
591 | |
|
|
592 | // make sure rekeying timeouts are slightly asymmetric |
|
|
593 | rekey.start (NOW + ::conf.rekey |
|
|
594 | + (conf->id > THISNODE->id ? 10 : 0)); |
|
|
595 | keepalive.start (NOW + ::conf.keepalive); |
|
|
596 | |
|
|
597 | // send queued packets |
|
|
598 | if (ictx && octx) |
|
|
599 | { |
719 | { |
600 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
|
|
601 | { |
|
|
602 | send_data_packet (p); |
720 | if (p->len) send_data_packet (p); |
603 | delete p; |
721 | delete p; |
604 | } |
|
|
605 | |
|
|
606 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
607 | { |
|
|
608 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
609 | delete p; |
|
|
610 | } |
|
|
611 | } |
722 | } |
|
|
723 | |
|
|
724 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
725 | { |
|
|
726 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
727 | delete p; |
|
|
728 | } |
612 | } |
729 | } |
|
|
730 | |
|
|
731 | vpn->connection_established (this); |
|
|
732 | } |
|
|
733 | |
|
|
734 | void |
|
|
735 | connection::reset_si () |
|
|
736 | { |
|
|
737 | if (vpn->can_direct (THISNODE, conf)) |
|
|
738 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
613 | else |
739 | else |
614 | { |
740 | { |
615 | retry_cnt = 0; |
741 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
616 | establish_connection.start (NOW + 5); |
742 | protocol = 0; |
617 | keepalive.stop (); |
|
|
618 | rekey.stop (); |
|
|
619 | } |
743 | } |
620 | } |
|
|
621 | |
|
|
622 | void |
|
|
623 | connection::reset_si () |
|
|
624 | { |
|
|
625 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
|
|
626 | |
|
|
627 | // mask out protocols we cannot establish |
|
|
628 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
629 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
630 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
631 | |
744 | |
632 | si.set (conf, protocol); |
745 | si.set (conf, protocol); |
|
|
746 | |
|
|
747 | is_direct = si.valid (); |
633 | } |
748 | } |
634 | |
749 | |
635 | // ensure sockinfo is valid, forward if necessary |
750 | // ensure sockinfo is valid, forward if necessary |
636 | const sockinfo & |
751 | const sockinfo & |
637 | connection::forward_si (const sockinfo &si) const |
752 | connection::forward_si (const sockinfo &si) const |
638 | { |
753 | { |
639 | if (!si.valid ()) |
754 | if (!si.valid ()) |
640 | { |
755 | { |
641 | connection *r = vpn->find_router (); |
756 | connection *r = vpn->find_router_for (this); |
642 | |
757 | |
643 | if (r) |
758 | if (r) |
644 | { |
759 | { |
645 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
760 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
646 | conf->nodename, r->conf->nodename, (const char *)r->si); |
761 | conf->nodename, r->conf->nodename); |
647 | return r->si; |
762 | return r->si; |
648 | } |
763 | } |
649 | else |
764 | else |
650 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
765 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
651 | conf->nodename); |
766 | conf->nodename); |
652 | } |
767 | } |
653 | |
768 | |
654 | return si; |
769 | return si; |
655 | } |
770 | } |
… | |
… | |
665 | connection::send_ping (const sockinfo &si, u8 pong) |
780 | connection::send_ping (const sockinfo &si, u8 pong) |
666 | { |
781 | { |
667 | ping_packet *pkt = new ping_packet; |
782 | ping_packet *pkt = new ping_packet; |
668 | |
783 | |
669 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
784 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
785 | |
|
|
786 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
670 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
787 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
671 | |
788 | |
672 | delete pkt; |
789 | delete pkt; |
673 | } |
790 | } |
674 | |
791 | |
… | |
… | |
689 | void |
806 | void |
690 | connection::send_auth_request (const sockinfo &si, bool initiate) |
807 | connection::send_auth_request (const sockinfo &si, bool initiate) |
691 | { |
808 | { |
692 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
809 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
693 | |
810 | |
694 | rsachallenge chg; |
811 | generate_auth_data (); |
695 | rsa_cache.gen (pkt->id, chg); |
|
|
696 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
812 | auth_encrypt (conf->rsa_key, snd_auth, pkt->encr); |
697 | |
813 | |
698 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
814 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
699 | |
|
|
700 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
815 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
701 | |
816 | |
702 | delete pkt; |
817 | delete pkt; |
703 | } |
818 | } |
704 | |
819 | |
705 | void |
820 | void |
706 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
821 | connection::send_auth_response (const sockinfo &si) |
707 | { |
822 | { |
708 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
823 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
709 | |
824 | |
710 | pkt->id = id; |
825 | auth_hash (rcv_auth, pkt->response.mac); |
|
|
826 | memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b)); |
711 | |
827 | |
712 | rsa_hash (id, chg, pkt->response); |
|
|
713 | |
|
|
714 | pkt->hmac_set (octx); |
|
|
715 | |
|
|
716 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
828 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
717 | |
|
|
718 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
829 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
719 | |
830 | |
720 | delete pkt; |
831 | delete pkt; |
721 | } |
832 | } |
722 | |
833 | |
723 | void |
834 | void |
724 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
835 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
725 | { |
836 | { |
726 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
837 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
727 | conf->id, rid, (const char *)rsi); |
838 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
839 | conf->protocols); |
728 | |
840 | |
729 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
841 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
730 | |
842 | |
731 | r->hmac_set (octx); |
843 | r->hmac_set (octx); |
732 | send_vpn_packet (r, si); |
844 | send_vpn_packet (r, si); |
733 | |
845 | |
734 | delete r; |
846 | delete r; |
735 | } |
847 | } |
736 | |
848 | |
737 | void |
849 | inline void |
738 | connection::establish_connection_cb (time_watcher &w) |
850 | connection::establish_connection_cb (ev::timer &w, int revents) |
739 | { |
851 | { |
740 | if (!ictx |
852 | if (!(ictx && octx) |
741 | && conf != THISNODE |
853 | && conf != THISNODE |
742 | && connectmode != conf_node::C_NEVER |
854 | && connectmode != conf_node::C_NEVER |
743 | && connectmode != conf_node::C_DISABLED |
855 | && connectmode != conf_node::C_DISABLED |
744 | && NOW > w.at) |
856 | && !w.is_active ()) |
745 | { |
857 | { |
746 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
858 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
|
|
859 | // and stop trying. should probably be handled by a per-connection expire handler. |
|
|
860 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
861 | { |
|
|
862 | reset_connection (); |
|
|
863 | return; |
|
|
864 | } |
747 | |
865 | |
748 | double retry_int = double (retry_cnt & 3 |
866 | last_establish_attempt = ev_now (); |
|
|
867 | |
|
|
868 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
749 | ? (retry_cnt & 3) + 1 |
869 | ? (retry_cnt & 3) + 1 |
750 | : 1 << (retry_cnt >> 2)); |
870 | : 1 << (retry_cnt >> 2)); |
751 | |
871 | |
752 | reset_si (); |
872 | reset_si (); |
753 | |
873 | |
754 | bool slow = si.prot & PROT_SLOW; |
874 | bool slow = si.prot & PROT_SLOW; |
755 | |
875 | |
756 | if (si.prot && !si.host) |
876 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
|
|
877 | { |
|
|
878 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
879 | w.start (1); |
757 | vpn->send_connect_request (conf->id); |
880 | vpn->send_connect_request (this); |
|
|
881 | } |
758 | else |
882 | else |
759 | { |
883 | { |
|
|
884 | if (si.valid ()) |
|
|
885 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
886 | conf->nodename, (const char *)si); |
|
|
887 | |
760 | const sockinfo &dsi = forward_si (si); |
888 | const sockinfo &dsi = forward_si (si); |
761 | |
889 | |
762 | slow = slow || (dsi.prot & PROT_SLOW); |
890 | slow = slow || (dsi.prot & PROT_SLOW); |
763 | |
891 | |
764 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
892 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
… | |
… | |
768 | else |
896 | else |
769 | send_ping (dsi, 0); |
897 | send_ping (dsi, 0); |
770 | } |
898 | } |
771 | } |
899 | } |
772 | |
900 | |
773 | retry_int *= slow ? 8. : 0.7; |
901 | retry_int *= slow ? 8. : 0.9; |
774 | |
902 | |
775 | if (retry_int < conf->max_retry) |
903 | if (retry_int < conf->max_retry) |
776 | retry_cnt++; |
904 | retry_cnt++; |
777 | else |
905 | else |
778 | retry_int = conf->max_retry; |
906 | retry_int = conf->max_retry; |
779 | |
907 | |
780 | w.start (NOW + retry_int); |
908 | w.start (retry_int); |
781 | } |
909 | } |
782 | } |
910 | } |
783 | |
911 | |
784 | void |
912 | void |
785 | connection::reset_connection () |
913 | connection::reset_connection () |
… | |
… | |
788 | { |
916 | { |
789 | slog (L_INFO, _("%s(%s): connection lost"), |
917 | slog (L_INFO, _("%s(%s): connection lost"), |
790 | conf->nodename, (const char *)si); |
918 | conf->nodename, (const char *)si); |
791 | |
919 | |
792 | if (::conf.script_node_down) |
920 | if (::conf.script_node_down) |
793 | run_script (run_script_cb (this, &connection::script_node_down), false); |
921 | { |
|
|
922 | run_script_cb *cb = new run_script_cb; |
|
|
923 | cb->set<connection, &connection::script_node_down> (this); |
|
|
924 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
925 | } |
794 | } |
926 | } |
795 | |
927 | |
796 | delete ictx; ictx = 0; |
928 | delete ictx; ictx = 0; |
797 | delete octx; octx = 0; |
929 | delete octx; octx = 0; |
798 | #if ENABLE_DNS |
|
|
799 | dnsv4_reset_connection (); |
|
|
800 | #endif |
|
|
801 | |
930 | |
802 | si.host = 0; |
931 | si.host = 0; |
803 | |
932 | |
|
|
933 | have_snd_auth = false; |
|
|
934 | have_rcv_auth = false; |
|
|
935 | auth_expire = 0.; |
|
|
936 | |
804 | last_activity = 0; |
937 | last_activity = 0.; |
|
|
938 | //last_si_change = 0.; |
805 | retry_cnt = 0; |
939 | retry_cnt = 0; |
806 | |
940 | |
807 | rekey.stop (); |
941 | rekey.stop (); |
808 | keepalive.stop (); |
942 | keepalive.stop (); |
809 | establish_connection.stop (); |
943 | establish_connection.stop (); |
… | |
… | |
816 | send_reset (si); |
950 | send_reset (si); |
817 | |
951 | |
818 | reset_connection (); |
952 | reset_connection (); |
819 | } |
953 | } |
820 | |
954 | |
821 | void |
955 | // poor-man's rekeying |
822 | connection::rekey_cb (time_watcher &w) |
956 | inline void |
|
|
957 | connection::rekey_cb (ev::timer &w, int revents) |
823 | { |
958 | { |
824 | reset_connection (); |
959 | reset_connection (); |
825 | establish_connection (); |
960 | establish_connection (); |
826 | } |
961 | } |
827 | |
962 | |
… | |
… | |
843 | if (oseqno > MAX_SEQNO) |
978 | if (oseqno > MAX_SEQNO) |
844 | rekey (); |
979 | rekey (); |
845 | } |
980 | } |
846 | |
981 | |
847 | void |
982 | void |
|
|
983 | connection::post_inject_queue () |
|
|
984 | { |
|
|
985 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
986 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
987 | establish_connection.stop (); |
|
|
988 | |
|
|
989 | establish_connection (); |
|
|
990 | } |
|
|
991 | |
|
|
992 | void |
848 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
993 | connection::inject_data_packet (tap_packet *pkt) |
849 | { |
994 | { |
850 | if (ictx && octx) |
995 | if (ictx && octx) |
851 | send_data_packet (pkt); |
996 | send_data_packet (pkt); |
852 | else |
997 | else |
853 | { |
998 | { |
854 | if (!broadcast)//DDDD |
|
|
855 | data_queue.put (new tap_packet (*pkt)); |
999 | data_queue.put (new tap_packet (*pkt)); |
856 | |
1000 | post_inject_queue (); |
857 | establish_connection (); |
|
|
858 | } |
1001 | } |
859 | } |
1002 | } |
860 | |
1003 | |
|
|
1004 | void |
861 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1005 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
862 | { |
1006 | { |
863 | if (ictx && octx) |
1007 | if (ictx && octx) |
864 | send_vpn_packet (pkt, si, tos); |
1008 | send_vpn_packet (pkt, si, tos); |
865 | else |
1009 | else |
866 | { |
1010 | { |
867 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
1011 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
868 | |
1012 | post_inject_queue (); |
869 | establish_connection (); |
|
|
870 | } |
1013 | } |
871 | } |
1014 | } |
872 | |
1015 | |
873 | void |
1016 | void |
874 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1017 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
875 | { |
1018 | { |
876 | last_activity = NOW; |
1019 | last_activity = ev_now (); |
877 | |
1020 | |
878 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1021 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
879 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1022 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1023 | |
|
|
1024 | if (connectmode == conf_node::C_DISABLED) |
|
|
1025 | return; |
880 | |
1026 | |
881 | switch (pkt->typ ()) |
1027 | switch (pkt->typ ()) |
882 | { |
1028 | { |
883 | case vpn_packet::PT_PING: |
1029 | case vpn_packet::PT_PING: |
|
|
1030 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1031 | |
884 | // we send pings instead of auth packets after some retries, |
1032 | // we send pings instead of auth packets after some retries, |
885 | // so reset the retry counter and establish a connection |
1033 | // so reset the retry counter and establish a connection |
886 | // when we receive a ping. |
1034 | // when we receive a ping. |
887 | if (!ictx) |
1035 | if (!ictx) |
888 | { |
1036 | { |
889 | if (auth_rate_limiter.can (rsi)) |
1037 | if (auth_rate_limiter.can (rsi)) |
890 | send_auth_request (rsi, true); |
1038 | send_auth_request (rsi, true); |
891 | } |
1039 | } |
892 | else |
1040 | else |
|
|
1041 | // we would love to change the socket address here, but ping's aren't |
|
|
1042 | // authenticated, so we best ignore it. |
893 | send_ping (rsi, 1); // pong |
1043 | send_ping (rsi, 1); // pong |
894 | |
1044 | |
895 | break; |
1045 | break; |
896 | |
1046 | |
897 | case vpn_packet::PT_PONG: |
1047 | case vpn_packet::PT_PONG: |
|
|
1048 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1049 | |
|
|
1050 | // a PONG might mean that the other side doesn't really know |
|
|
1051 | // about our desire for communication. |
|
|
1052 | establish_connection (); |
898 | break; |
1053 | break; |
899 | |
1054 | |
900 | case vpn_packet::PT_RESET: |
1055 | case vpn_packet::PT_RESET: |
901 | { |
1056 | { |
902 | reset_connection (); |
1057 | reset_connection (); |
903 | |
1058 | |
904 | config_packet *p = (config_packet *) pkt; |
1059 | config_packet *p = (config_packet *) pkt; |
905 | |
1060 | |
906 | if (!p->chk_config ()) |
1061 | if (!p->chk_config ()) |
907 | { |
1062 | { |
908 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1063 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
909 | conf->nodename, (const char *)rsi); |
1064 | conf->nodename, (const char *)rsi); |
910 | connectmode = conf_node::C_DISABLED; |
1065 | connectmode = conf_node::C_DISABLED; |
911 | } |
1066 | } |
912 | else if (connectmode == conf_node::C_ALWAYS) |
1067 | else if (connectmode == conf_node::C_ALWAYS) |
913 | establish_connection (); |
1068 | establish_connection (); |
… | |
… | |
915 | break; |
1070 | break; |
916 | |
1071 | |
917 | case vpn_packet::PT_AUTH_REQ: |
1072 | case vpn_packet::PT_AUTH_REQ: |
918 | if (auth_rate_limiter.can (rsi)) |
1073 | if (auth_rate_limiter.can (rsi)) |
919 | { |
1074 | { |
920 | auth_req_packet *p = (auth_req_packet *) pkt; |
1075 | auth_req_packet *p = (auth_req_packet *)pkt; |
921 | |
1076 | |
922 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1077 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1078 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1079 | p->protocols, p->features); |
923 | |
1080 | |
924 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1081 | if (p->chk_config () && !memcmp (p->magic, MAGIC, 8)) |
925 | { |
1082 | { |
926 | if (p->prot_minor != PROTOCOL_MINOR) |
1083 | if (p->prot_minor != PROTOCOL_MINOR) |
927 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1084 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
928 | conf->nodename, (const char *)rsi, |
1085 | conf->nodename, (const char *)rsi, |
929 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1086 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
930 | |
1087 | |
931 | if (p->initiate) |
1088 | if (p->initiate) |
932 | send_auth_request (rsi, false); |
1089 | send_auth_request (rsi, false); |
933 | |
1090 | |
934 | rsachallenge k; |
1091 | auth_data auth; |
935 | |
1092 | |
936 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
1093 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
937 | { |
1094 | { |
938 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1095 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
939 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1096 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
940 | break; |
|
|
941 | } |
1097 | } |
942 | else |
1098 | else |
943 | { |
1099 | { |
944 | delete octx; |
1100 | bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth); |
945 | |
1101 | |
946 | octx = new crypto_ctx (k, 1); |
1102 | rcv_auth = auth; |
947 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1103 | have_rcv_auth = true; |
948 | |
1104 | |
|
|
1105 | send_auth_response (rsi); |
|
|
1106 | |
|
|
1107 | if (chg) |
|
|
1108 | { |
949 | conf->protocols = p->protocols; |
1109 | conf->protocols = p->protocols; |
950 | features = p->features & config_packet::get_features (); |
1110 | features = p->features & config_packet::get_features (); |
951 | |
1111 | |
952 | send_auth_response (rsi, p->id, k); |
|
|
953 | |
|
|
954 | connection_established (); |
1112 | connection_established (rsi); |
955 | |
|
|
956 | break; |
1113 | } |
957 | } |
1114 | } |
|
|
1115 | |
|
|
1116 | break; |
958 | } |
1117 | } |
959 | else |
1118 | else |
960 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1119 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
961 | conf->nodename, (const char *)rsi); |
1120 | conf->nodename, (const char *)rsi); |
962 | |
1121 | |
963 | send_reset (rsi); |
1122 | send_reset (rsi); |
964 | } |
1123 | } |
965 | |
1124 | |
966 | break; |
1125 | break; |
967 | |
1126 | |
968 | case vpn_packet::PT_AUTH_RES: |
1127 | case vpn_packet::PT_AUTH_RES: |
969 | { |
1128 | { |
970 | auth_res_packet *p = (auth_res_packet *) pkt; |
1129 | auth_res_packet *p = (auth_res_packet *)pkt; |
971 | |
1130 | |
972 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1131 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
973 | |
1132 | |
974 | if (p->chk_config ()) |
1133 | if (p->chk_config ()) |
975 | { |
1134 | { |
976 | if (p->prot_minor != PROTOCOL_MINOR) |
1135 | if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac))) |
977 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
978 | conf->nodename, (const char *)rsi, |
|
|
979 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
980 | |
|
|
981 | rsachallenge chg; |
|
|
982 | |
|
|
983 | if (!rsa_cache.find (p->id, chg)) |
|
|
984 | { |
1136 | { |
985 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1137 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
986 | conf->nodename, (const char *)rsi); |
1138 | conf->nodename, (const char *)rsi); |
987 | break; |
|
|
988 | } |
1139 | } |
989 | else |
1140 | else if (!have_snd_auth) |
990 | { |
1141 | { |
991 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1142 | if (p->prot_minor != PROTOCOL_MINOR) |
992 | |
1143 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
993 | if (!p->hmac_chk (cctx)) |
|
|
994 | { |
|
|
995 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
996 | "could be an attack, or just corruption or a synchronization error"), |
|
|
997 | conf->nodename, (const char *)rsi); |
1144 | conf->nodename, (const char *)rsi, |
998 | break; |
1145 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
999 | } |
|
|
1000 | else |
|
|
1001 | { |
|
|
1002 | rsaresponse h; |
|
|
1003 | |
1146 | |
1004 | rsa_hash (p->id, chg, h); |
|
|
1005 | |
|
|
1006 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
1007 | { |
|
|
1008 | prot_minor = p->prot_minor; |
1147 | prot_minor = p->prot_minor; |
|
|
1148 | memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b)); |
1009 | |
1149 | |
1010 | delete ictx; ictx = cctx; |
1150 | have_snd_auth = true; |
1011 | |
|
|
1012 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
1013 | |
|
|
1014 | si = rsi; |
|
|
1015 | protocol = rsi.prot; |
|
|
1016 | |
|
|
1017 | connection_established (); |
1151 | connection_established (rsi); |
1018 | |
|
|
1019 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1020 | conf->nodename, (const char *)rsi, |
|
|
1021 | p->prot_major, p->prot_minor); |
|
|
1022 | |
|
|
1023 | if (::conf.script_node_up) |
|
|
1024 | run_script (run_script_cb (this, &connection::script_node_up), false); |
|
|
1025 | |
|
|
1026 | break; |
|
|
1027 | } |
|
|
1028 | else |
|
|
1029 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
1030 | conf->nodename, (const char *)rsi); |
|
|
1031 | } |
|
|
1032 | |
|
|
1033 | delete cctx; |
|
|
1034 | } |
1152 | } |
|
|
1153 | |
|
|
1154 | break; |
1035 | } |
1155 | } |
1036 | } |
1156 | } |
1037 | |
1157 | |
1038 | send_reset (rsi); |
1158 | send_reset (rsi); |
1039 | break; |
1159 | break; |
… | |
… | |
1050 | { |
1170 | { |
1051 | vpndata_packet *p = (vpndata_packet *)pkt; |
1171 | vpndata_packet *p = (vpndata_packet *)pkt; |
1052 | |
1172 | |
1053 | if (!p->hmac_chk (ictx)) |
1173 | if (!p->hmac_chk (ictx)) |
1054 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1174 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1055 | "could be an attack, or just corruption or a synchronization error"), |
1175 | "could be an attack, or just corruption or a synchronization error."), |
1056 | conf->nodename, (const char *)rsi); |
1176 | conf->nodename, (const char *)rsi); |
1057 | else |
1177 | else |
1058 | { |
1178 | { |
1059 | u32 seqno; |
1179 | u32 seqno; |
1060 | tap_packet *d = p->unpack (this, seqno); |
1180 | tap_packet *d = p->unpack (this, seqno); |
|
|
1181 | int seqclass = iseqno.seqno_classify (seqno); |
1061 | |
1182 | |
1062 | if (iseqno.recv_ok (seqno)) |
1183 | if (seqclass == 0) // ok |
1063 | { |
1184 | { |
1064 | vpn->tap->send (d); |
1185 | vpn->tap->send (d); |
1065 | |
1186 | |
1066 | if (si != rsi) |
1187 | if (si != rsi) |
1067 | { |
1188 | { |
1068 | // fast re-sync on connection changes, useful especially for tcp/ip |
1189 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1190 | //if (last_si_change < ev_now () + 5.) |
1069 | si = rsi; |
1191 | // { |
1070 | |
|
|
1071 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1192 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1072 | conf->nodename, (const char *)si, (const char *)rsi); |
1193 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1194 | |
|
|
1195 | si = rsi; |
|
|
1196 | |
|
|
1197 | if (::conf.script_node_change) |
|
|
1198 | { |
|
|
1199 | run_script_cb *cb = new run_script_cb; |
|
|
1200 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1201 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1202 | } |
|
|
1203 | |
|
|
1204 | // } |
|
|
1205 | //else |
|
|
1206 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1207 | // conf->nodename, (const char *)si, (const char *)rsi); |
1073 | } |
1208 | } |
|
|
1209 | } |
|
|
1210 | else if (seqclass == 1) // far history |
|
|
1211 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1212 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1213 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1214 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1215 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1216 | else if (seqclass == 3) // reset |
|
|
1217 | { |
|
|
1218 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1219 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1220 | send_reset (rsi); |
1074 | } |
1221 | } |
1075 | |
1222 | |
1076 | delete d; |
1223 | delete d; |
1077 | break; |
1224 | break; |
1078 | } |
1225 | } |
… | |
… | |
1082 | break; |
1229 | break; |
1083 | |
1230 | |
1084 | case vpn_packet::PT_CONNECT_REQ: |
1231 | case vpn_packet::PT_CONNECT_REQ: |
1085 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1232 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1086 | { |
1233 | { |
1087 | connect_req_packet *p = (connect_req_packet *) pkt; |
1234 | connect_req_packet *p = (connect_req_packet *)pkt; |
1088 | |
1235 | |
1089 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1236 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1090 | connection *c = vpn->conns[p->id - 1]; |
|
|
1091 | conf->protocols = p->protocols; |
|
|
1092 | |
|
|
1093 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1094 | conf->id, p->id, c->ictx && c->octx); |
|
|
1095 | |
|
|
1096 | if (c->ictx && c->octx) |
|
|
1097 | { |
1237 | { |
|
|
1238 | connection *c = vpn->conns[p->id - 1]; |
|
|
1239 | conf->protocols = p->protocols; |
|
|
1240 | |
|
|
1241 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1242 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1243 | p->protocols, |
|
|
1244 | c->ictx && c->octx); |
|
|
1245 | |
|
|
1246 | if (c->ictx && c->octx) |
|
|
1247 | { |
1098 | // send connect_info packets to both sides, in case one is |
1248 | // send connect_info packets to both sides, in case one is |
1099 | // behind a nat firewall (or both ;) |
1249 | // behind a nat firewall (or both ;) |
1100 | c->send_connect_info (conf->id, si, conf->protocols); |
1250 | c->send_connect_info (conf->id, si, conf->protocols); |
1101 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1251 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1252 | } |
|
|
1253 | else |
|
|
1254 | c->establish_connection (); |
1102 | } |
1255 | } |
1103 | else |
1256 | else |
1104 | c->establish_connection (); |
1257 | slog (L_WARN, |
|
|
1258 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1259 | p->id); |
1105 | } |
1260 | } |
1106 | |
1261 | |
1107 | break; |
1262 | break; |
1108 | |
1263 | |
1109 | case vpn_packet::PT_CONNECT_INFO: |
1264 | case vpn_packet::PT_CONNECT_INFO: |
1110 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1265 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1111 | { |
1266 | { |
1112 | connect_info_packet *p = (connect_info_packet *)pkt; |
1267 | connect_info_packet *p = (connect_info_packet *)pkt; |
1113 | |
1268 | |
1114 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1269 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1115 | { |
1270 | { |
1116 | connection *c = vpn->conns[p->id - 1]; |
1271 | connection *c = vpn->conns[p->id - 1]; |
1117 | |
1272 | |
1118 | c->conf->protocols = p->protocols; |
1273 | c->conf->protocols = p->protocols; |
1119 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1274 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1120 | p->si.upgrade_protocol (protocol, c->conf); |
1275 | p->si.upgrade_protocol (protocol, c->conf); |
1121 | |
1276 | |
1122 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1277 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1123 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1278 | conf->nodename, |
|
|
1279 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1280 | (const char *)p->si, |
|
|
1281 | p->protocols, |
|
|
1282 | protocol, |
|
|
1283 | p->si.supported_protocols (c->conf), |
|
|
1284 | !c->ictx && !c->octx); |
1124 | |
1285 | |
1125 | const sockinfo &dsi = forward_si (p->si); |
1286 | const sockinfo &dsi = forward_si (p->si); |
1126 | |
1287 | |
1127 | if (dsi.valid ()) |
1288 | if (dsi.valid ()) |
1128 | c->send_auth_request (dsi, true); |
1289 | c->send_auth_request (dsi, true); |
|
|
1290 | else |
|
|
1291 | slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
|
|
1292 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1293 | (const char *)p->si); |
1129 | } |
1294 | } |
|
|
1295 | else |
|
|
1296 | slog (L_WARN, |
|
|
1297 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1298 | p->id); |
1130 | } |
1299 | } |
1131 | |
1300 | |
1132 | break; |
1301 | break; |
1133 | |
1302 | |
1134 | default: |
1303 | default: |
1135 | send_reset (rsi); |
1304 | send_reset (rsi); |
1136 | break; |
1305 | break; |
1137 | } |
1306 | } |
1138 | } |
1307 | } |
1139 | |
1308 | |
1140 | void connection::keepalive_cb (time_watcher &w) |
1309 | inline void |
|
|
1310 | connection::keepalive_cb (ev::timer &w, int revents) |
1141 | { |
1311 | { |
1142 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1312 | ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
|
|
1313 | |
|
|
1314 | if (when >= 0) |
|
|
1315 | w.start (when); |
|
|
1316 | else if (when < -15) |
1143 | { |
1317 | { |
1144 | reset_connection (); |
1318 | reset_connection (); |
1145 | establish_connection (); |
1319 | establish_connection (); |
1146 | } |
1320 | } |
1147 | else if (NOW < last_activity + ::conf.keepalive) |
|
|
1148 | w.start (last_activity + ::conf.keepalive); |
|
|
1149 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1321 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1150 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1322 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1151 | { |
1323 | { |
|
|
1324 | w.start (3); |
1152 | send_ping (si); |
1325 | send_ping (si); |
1153 | w.start (NOW + 5); |
|
|
1154 | } |
1326 | } |
1155 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1327 | else if (when >= -10) |
1156 | // hold ondemand connections implicitly a few seconds longer |
1328 | // hold ondemand connections implicitly a few seconds longer |
1157 | // should delete octx, though, or something like that ;) |
1329 | // should delete octx, though, or something like that ;) |
1158 | w.start (last_activity + ::conf.keepalive + 10); |
1330 | w.start (when + 10); |
1159 | else |
1331 | else |
1160 | reset_connection (); |
1332 | reset_connection (); |
1161 | } |
1333 | } |
1162 | |
1334 | |
|
|
1335 | void |
1163 | void connection::send_connect_request (int id) |
1336 | connection::send_connect_request (int id) |
1164 | { |
1337 | { |
1165 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1338 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1166 | |
1339 | |
1167 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1340 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1341 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1342 | THISNODE->protocols); |
1168 | p->hmac_set (octx); |
1343 | p->hmac_set (octx); |
1169 | send_vpn_packet (p, si); |
1344 | send_vpn_packet (p, si); |
1170 | |
1345 | |
1171 | delete p; |
1346 | delete p; |
1172 | } |
1347 | } |
1173 | |
1348 | |
1174 | void connection::script_node () |
1349 | void |
|
|
1350 | connection::script_init_env (const char *ext) |
1175 | { |
1351 | { |
1176 | vpn->script_if_up (); |
|
|
1177 | |
|
|
1178 | char *env; |
1352 | char *env; |
|
|
1353 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1354 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1355 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1356 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1357 | conf->id & 0xff); putenv (env); |
|
|
1358 | } |
|
|
1359 | |
|
|
1360 | void |
|
|
1361 | connection::script_init_connect_env () |
|
|
1362 | { |
|
|
1363 | vpn->script_init_env (); |
|
|
1364 | |
|
|
1365 | char *env; |
1179 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1366 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1367 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1180 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1368 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1181 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1369 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1182 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1370 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1183 | } |
1371 | } |
1184 | |
1372 | |
|
|
1373 | inline const char * |
1185 | const char *connection::script_node_up () |
1374 | connection::script_node_up () |
1186 | { |
1375 | { |
1187 | script_node (); |
1376 | script_init_connect_env (); |
1188 | |
1377 | |
1189 | putenv ("STATE=up"); |
1378 | putenv ((char *)"STATE=up"); |
1190 | |
1379 | |
|
|
1380 | char *filename; |
|
|
1381 | asprintf (&filename, |
|
|
1382 | "%s/%s", |
|
|
1383 | confbase, |
1191 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1384 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1192 | } |
|
|
1193 | |
1385 | |
|
|
1386 | return filename; |
|
|
1387 | } |
|
|
1388 | |
|
|
1389 | inline const char * |
|
|
1390 | connection::script_node_change () |
|
|
1391 | { |
|
|
1392 | script_init_connect_env (); |
|
|
1393 | |
|
|
1394 | putenv ((char *)"STATE=change"); |
|
|
1395 | |
|
|
1396 | char *filename; |
|
|
1397 | asprintf (&filename, |
|
|
1398 | "%s/%s", |
|
|
1399 | confbase, |
|
|
1400 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
|
|
1401 | |
|
|
1402 | return filename; |
|
|
1403 | } |
|
|
1404 | |
|
|
1405 | inline const char * |
1194 | const char *connection::script_node_down () |
1406 | connection::script_node_down () |
1195 | { |
1407 | { |
1196 | script_node (); |
1408 | script_init_connect_env (); |
1197 | |
1409 | |
1198 | putenv ("STATE=down"); |
1410 | putenv ((char *)"STATE=down"); |
1199 | |
1411 | |
1200 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1412 | char *filename; |
|
|
1413 | asprintf (&filename, |
|
|
1414 | "%s/%s", |
|
|
1415 | confbase, |
|
|
1416 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
|
|
1417 | |
|
|
1418 | return filename; |
1201 | } |
1419 | } |
1202 | |
1420 | |
1203 | connection::connection (struct vpn *vpn, conf_node *conf) |
1421 | connection::connection (struct vpn *vpn, conf_node *conf) |
1204 | : vpn(vpn), conf(conf) |
1422 | : vpn(vpn), conf(conf), |
1205 | , rekey (this, &connection::rekey_cb) |
|
|
1206 | , keepalive (this, &connection::keepalive_cb) |
|
|
1207 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1208 | #if ENABLE_DNS |
1423 | #if ENABLE_DNS |
1209 | , dns (0) |
1424 | dns (0), |
1210 | #endif |
1425 | #endif |
|
|
1426 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1427 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1211 | { |
1428 | { |
|
|
1429 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1430 | keepalive .set<connection, &connection::keepalive_cb > (this); |
|
|
1431 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
|
|
1432 | |
|
|
1433 | last_establish_attempt = 0.; |
1212 | octx = ictx = 0; |
1434 | octx = ictx = 0; |
1213 | retry_cnt = 0; |
|
|
1214 | |
1435 | |
1215 | if (!conf->protocols) // make sure some protocol is enabled |
1436 | connectmode = conf->connectmode; |
1216 | conf->protocols = PROT_UDPv4; |
|
|
1217 | |
1437 | |
1218 | connectmode = conf_node::C_ALWAYS; // initial setting |
1438 | // queue a dummy packet to force an initial connection attempt |
|
|
1439 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1440 | vpn_queue.put (new net_packet); |
|
|
1441 | |
1219 | reset_connection (); |
1442 | reset_connection (); |
1220 | } |
1443 | } |
1221 | |
1444 | |
1222 | connection::~connection () |
1445 | connection::~connection () |
1223 | { |
1446 | { |
1224 | shutdown (); |
1447 | shutdown (); |
1225 | } |
1448 | } |
1226 | |
1449 | |
|
|
1450 | void |
1227 | void connection_init () |
1451 | connection_init () |
1228 | { |
1452 | { |
1229 | auth_rate_limiter.clear (); |
1453 | auth_rate_limiter.clear (); |
1230 | reset_rate_limiter.clear (); |
1454 | reset_rate_limiter.clear (); |
1231 | } |
1455 | } |
1232 | |
1456 | |