1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | 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 |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
8 | (at your option) any later version. |
10 | option) any later version. |
9 | |
11 | |
10 | 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 |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
13 | GNU General Public License for more details. |
15 | Public License for more details. |
14 | |
16 | |
15 | 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 |
16 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
17 | 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. |
18 | */ |
30 | */ |
19 | |
31 | |
20 | #include "config.h" |
32 | #include "config.h" |
21 | |
33 | |
22 | extern "C" { |
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23 | # include "lzf/lzf.h" |
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24 | } |
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25 | |
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26 | #include <cassert> |
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27 | |
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28 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
29 | |
37 | |
30 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
31 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
32 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
33 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
34 | |
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35 | #include "gettext.h" |
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36 | |
42 | |
37 | #include "conf.h" |
43 | #include "conf.h" |
38 | #include "slog.h" |
44 | #include "slog.h" |
39 | #include "device.h" |
45 | #include "device.h" |
40 | #include "vpn.h" |
46 | #include "vpn.h" |
41 | #include "connection.h" |
47 | #include "connection.h" |
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48 | #include "hkdf.h" |
42 | |
49 | |
43 | #include "netcompat.h" |
50 | #include "netcompat.h" |
44 | |
51 | |
45 | #if !HAVE_RAND_PSEUDO_BYTES |
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46 | # define RAND_pseudo_bytes RAND_bytes |
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47 | #endif |
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48 | |
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49 | #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 |
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54 | |
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55 | #define ULTRA_FAST 1 |
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56 | #define HLOG 15 |
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57 | #include "lzf/lzf.h" |
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58 | #include "lzf/lzf_c.c" |
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59 | #include "lzf/lzf_d.c" |
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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 | ////////////////////////////////////////////////////////////////////////////// |
50 | |
104 | |
51 | struct crypto_ctx |
105 | struct crypto_ctx |
52 | { |
106 | { |
53 | EVP_CIPHER_CTX cctx; |
107 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
108 | HMAC_CTX hctx; |
55 | |
109 | |
56 | 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); |
57 | ~crypto_ctx (); |
111 | ~crypto_ctx (); |
58 | }; |
112 | }; |
59 | |
113 | |
60 | 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) |
61 | { |
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 | |
62 | EVP_CIPHER_CTX_init (&cctx); |
144 | EVP_CIPHER_CTX_init (&cctx); |
63 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
145 | require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc)); |
64 | HMAC_CTX_init (&hctx); |
146 | } |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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66 | } |
147 | } |
67 | |
148 | |
68 | crypto_ctx::~crypto_ctx () |
149 | crypto_ctx::~crypto_ctx () |
69 | { |
150 | { |
70 | EVP_CIPHER_CTX_cleanup (&cctx); |
151 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
71 | HMAC_CTX_cleanup (&hctx); |
152 | HMAC_CTX_cleanup (&hctx); |
72 | } |
153 | } |
73 | |
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 | |
74 | static void |
182 | static void |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
183 | auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac) |
76 | { |
184 | { |
77 | EVP_MD_CTX ctx; |
185 | hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt |
78 | |
186 | kdf.extract (&auth.rsa, sizeof (auth.rsa)); |
79 | EVP_MD_CTX_init (&ctx); |
187 | kdf.extract_done (); |
80 | EVP_DigestInit (&ctx, RSA_HASH); |
188 | kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info |
81 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
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82 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
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83 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
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84 | EVP_MD_CTX_cleanup (&ctx); |
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85 | } |
189 | } |
86 | |
190 | |
87 | struct rsa_entry { |
191 | void |
88 | tstamp expire; |
192 | connection::generate_auth_data () |
89 | rsaid id; |
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90 | rsachallenge chg; |
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91 | }; |
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92 | |
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93 | struct rsa_cache : list<rsa_entry> |
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94 | { |
193 | { |
95 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
194 | if (auth_expire < ev_now ()) |
96 | |
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97 | bool find (const rsaid &id, rsachallenge &chg) |
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98 | { |
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99 | for (iterator i = begin (); i != end (); ++i) |
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100 | { |
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101 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
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102 | { |
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103 | memcpy (&chg, &i->chg, sizeof chg); |
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104 | |
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105 | erase (i); |
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106 | return true; |
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107 | } |
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108 | } |
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109 | |
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110 | if (cleaner.at < NOW) |
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111 | cleaner.start (NOW + RSA_TTL); |
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112 | |
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113 | return false; |
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114 | } |
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115 | |
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116 | void gen (rsaid &id, rsachallenge &chg) |
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117 | { |
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118 | rsa_entry e; |
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119 | |
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120 | RAND_bytes ((unsigned char *)&id, sizeof id); |
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121 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
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122 | |
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123 | e.expire = NOW + RSA_TTL; |
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124 | e.id = id; |
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125 | memcpy (&e.chg, &chg, sizeof chg); |
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126 | |
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127 | push_back (e); |
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128 | |
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129 | if (cleaner.at < NOW) |
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130 | cleaner.start (NOW + RSA_TTL); |
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131 | } |
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132 | |
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133 | rsa_cache () |
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134 | : cleaner (this, &rsa_cache::cleaner_cb) |
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135 | { } |
195 | { |
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196 | // request data |
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197 | rand_fill (snd_auth.rsa); |
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198 | curve25519_generate (snd_ecdh_a, snd_auth.ecdh); |
136 | |
199 | |
137 | } rsa_cache; |
200 | // eventual response data |
138 | |
201 | curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); |
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
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140 | { |
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141 | if (!empty ()) |
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142 | { |
202 | } |
143 | w.start (NOW + RSA_TTL); |
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144 | |
203 | |
145 | for (iterator i = begin (); i != end (); ) |
204 | // every use prolongs the expiry |
146 | if (i->expire <= NOW) |
205 | auth_expire = ev_now () + AUTH_TTL; |
147 | i = erase (i); |
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148 | else |
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149 | ++i; |
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150 | } |
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151 | } |
206 | } |
152 | |
207 | |
153 | ////////////////////////////////////////////////////////////////////////////// |
208 | ////////////////////////////////////////////////////////////////////////////// |
154 | |
209 | |
155 | void pkt_queue::put (net_packet *p) |
210 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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211 | : max_ttl (max_ttl), max_queue (max_queue) |
156 | { |
212 | { |
157 | if (queue[i]) |
213 | queue = new pkt [max_queue]; |
158 | { |
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159 | delete queue[i]; |
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160 | j = (j + 1) % QUEUEDEPTH; |
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161 | } |
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162 | |
214 | |
163 | queue[i] = p; |
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164 | |
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165 | i = (i + 1) % QUEUEDEPTH; |
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166 | } |
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167 | |
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168 | net_packet *pkt_queue::get () |
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169 | { |
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170 | net_packet *p = queue[j]; |
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171 | |
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172 | if (p) |
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173 | { |
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174 | queue[j] = 0; |
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175 | j = (j + 1) % QUEUEDEPTH; |
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176 | } |
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177 | |
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178 | return p; |
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179 | } |
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180 | |
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181 | pkt_queue::pkt_queue () |
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182 | { |
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183 | memset (queue, 0, sizeof (queue)); |
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184 | i = 0; |
215 | i = 0; |
185 | j = 0; |
216 | j = 0; |
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217 | |
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218 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
186 | } |
219 | } |
187 | |
220 | |
188 | pkt_queue::~pkt_queue () |
221 | pkt_queue::~pkt_queue () |
189 | { |
222 | { |
190 | for (i = QUEUEDEPTH; --i > 0; ) |
223 | while (net_packet *p = get ()) |
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224 | delete p; |
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225 | |
191 | delete queue[i]; |
226 | delete [] queue; |
192 | } |
227 | } |
193 | |
228 | |
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229 | void |
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230 | pkt_queue::expire_cb (ev::timer &w, int revents) |
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231 | { |
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232 | ev_tstamp expire = ev_now () - max_ttl; |
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233 | |
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234 | for (;;) |
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235 | { |
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236 | if (empty ()) |
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237 | break; |
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238 | |
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239 | double diff = queue[j].tstamp - expire; |
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240 | |
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241 | if (diff >= 0.) |
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242 | { |
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243 | w.start (diff > 0.5 ? diff : 0.5); |
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244 | break; |
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245 | } |
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246 | |
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247 | delete get (); |
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248 | } |
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249 | } |
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250 | |
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251 | void |
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252 | pkt_queue::put (net_packet *p) |
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253 | { |
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254 | ev_tstamp now = ev_now (); |
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255 | |
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256 | // start expiry timer |
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257 | if (empty ()) |
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258 | expire.start (max_ttl); |
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259 | |
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260 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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261 | |
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262 | if (ni == j) |
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263 | delete get (); |
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264 | |
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265 | queue[i].pkt = p; |
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266 | queue[i].tstamp = now; |
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267 | |
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268 | i = ni; |
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269 | } |
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270 | |
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271 | net_packet * |
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272 | pkt_queue::get () |
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273 | { |
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274 | if (empty ()) |
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275 | return 0; |
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276 | |
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277 | net_packet *p = queue[j].pkt; |
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278 | queue[j].pkt = 0; |
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279 | |
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280 | j = j + 1 == max_queue ? 0 : j + 1; |
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281 | |
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282 | return p; |
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283 | } |
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284 | |
194 | struct net_rateinfo { |
285 | struct net_rateinfo |
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286 | { |
195 | u32 host; |
287 | u32 host; |
196 | double pcnt, diff; |
288 | double pcnt, diff; |
197 | tstamp last; |
289 | tstamp last; |
198 | }; |
290 | }; |
199 | |
291 | |
200 | // only do action once every x seconds per host whole allowing bursts. |
292 | // only do action once every x seconds per host whole allowing bursts. |
201 | // this implementation ("splay list" ;) is inefficient, |
293 | // this implementation ("splay list" ;) is inefficient, |
202 | // but low on resources. |
294 | // but low on resources. |
203 | struct net_rate_limiter : list<net_rateinfo> |
295 | struct net_rate_limiter : list<net_rateinfo> |
204 | { |
296 | { |
205 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
297 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
206 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
298 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
207 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
299 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
208 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
300 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
209 | |
301 | |
210 | bool can (const sockinfo &si) { return can((u32)si.host); } |
302 | bool can (const sockinfo &si) { return can((u32)si.host); } |
211 | bool can (u32 host); |
303 | bool can (u32 host); |
212 | }; |
304 | }; |
213 | |
305 | |
214 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
306 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
215 | |
307 | |
|
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308 | bool |
216 | bool net_rate_limiter::can (u32 host) |
309 | net_rate_limiter::can (u32 host) |
217 | { |
310 | { |
218 | iterator i; |
311 | iterator i; |
219 | |
312 | |
220 | for (i = begin (); i != end (); ) |
313 | for (i = begin (); i != end (); ) |
221 | if (i->host == host) |
314 | if (i->host == host) |
222 | break; |
315 | break; |
223 | else if (i->last < NOW - EXPIRE) |
316 | else if (i->last < ev_now () - NRL_EXPIRE) |
224 | i = erase (i); |
317 | i = erase (i); |
225 | else |
318 | else |
226 | i++; |
319 | i++; |
227 | |
320 | |
228 | if (i == end ()) |
321 | if (i == end ()) |
229 | { |
322 | { |
230 | net_rateinfo ri; |
323 | net_rateinfo ri; |
231 | |
324 | |
232 | ri.host = host; |
325 | ri.host = host; |
233 | ri.pcnt = 1.; |
326 | ri.pcnt = 1.; |
234 | ri.diff = MAXDIF; |
327 | ri.diff = NRL_MAXDIF; |
235 | ri.last = NOW; |
328 | ri.last = ev_now (); |
236 | |
329 | |
237 | push_front (ri); |
330 | push_front (ri); |
238 | |
331 | |
239 | return true; |
332 | return true; |
240 | } |
333 | } |
241 | else |
334 | else |
242 | { |
335 | { |
243 | net_rateinfo ri (*i); |
336 | net_rateinfo ri (*i); |
244 | erase (i); |
337 | erase (i); |
245 | |
338 | |
246 | ri.pcnt = ri.pcnt * ALPHA; |
339 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
247 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
340 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
248 | |
341 | |
249 | ri.last = NOW; |
342 | ri.last = ev_now (); |
250 | |
343 | |
251 | double dif = ri.diff / ri.pcnt; |
344 | double dif = ri.diff / ri.pcnt; |
252 | |
345 | |
253 | bool send = dif > CUTOFF; |
346 | bool send = dif > NRL_CUTOFF; |
254 | |
347 | |
255 | if (dif > MAXDIF) |
348 | if (dif > NRL_MAXDIF) |
256 | { |
349 | { |
257 | ri.pcnt = 1.; |
350 | ri.pcnt = 1.; |
258 | ri.diff = MAXDIF; |
351 | ri.diff = NRL_MAXDIF; |
259 | } |
352 | } |
260 | else if (send) |
353 | else if (send) |
261 | ri.pcnt++; |
354 | ri.pcnt++; |
262 | |
355 | |
263 | push_front (ri); |
356 | push_front (ri); |
… | |
… | |
266 | } |
359 | } |
267 | } |
360 | } |
268 | |
361 | |
269 | ///////////////////////////////////////////////////////////////////////////// |
362 | ///////////////////////////////////////////////////////////////////////////// |
270 | |
363 | |
271 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
364 | void |
272 | |
|
|
273 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
365 | hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest) |
274 | { |
366 | { |
275 | unsigned int xlen; |
|
|
276 | |
|
|
277 | HMAC_CTX *hctx = &ctx->hctx; |
367 | HMAC_CTX *hctx = &ctx->hctx; |
278 | |
368 | |
279 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
369 | require (HMAC_Init_ex (hctx, 0, 0, 0, 0)); |
280 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
370 | require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet))); |
281 | len - sizeof (hmac_packet)); |
371 | require (HMAC_Final (hctx, hmac_digest, 0)); |
282 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
|
|
283 | } |
372 | } |
284 | |
373 | |
285 | void |
374 | void |
286 | hmac_packet::hmac_set (crypto_ctx *ctx) |
375 | hmac_packet::hmac_set (crypto_ctx *ctx) |
287 | { |
376 | { |
288 | hmac_gen (ctx); |
377 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
289 | |
378 | hmac_gen (ctx, hmac_digest); |
290 | memcpy (hmac, hmac_digest, HMACLENGTH); |
379 | memcpy (hmac, hmac_digest, HMACLENGTH); |
291 | } |
380 | } |
292 | |
381 | |
293 | bool |
382 | bool |
294 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
383 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
295 | { |
384 | { |
296 | hmac_gen (ctx); |
385 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
297 | |
386 | hmac_gen (ctx, hmac_digest); |
298 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
387 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
299 | } |
388 | } |
300 | |
389 | |
|
|
390 | void |
301 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
391 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
302 | { |
392 | { |
303 | type = type_; |
393 | type = type_; |
304 | |
394 | |
305 | int src = THISNODE->id; |
395 | int src = THISNODE->id; |
306 | |
396 | |
… | |
… | |
310 | } |
400 | } |
311 | |
401 | |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
402 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
403 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
314 | |
404 | |
315 | struct vpndata_packet:vpn_packet |
405 | struct vpndata_packet : vpn_packet |
|
|
406 | { |
|
|
407 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
408 | |
|
|
409 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
410 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
411 | |
|
|
412 | private: |
|
|
413 | const u32 data_hdr_size () const |
316 | { |
414 | { |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
318 | |
|
|
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
321 | private: |
|
|
322 | |
|
|
323 | const u32 data_hdr_size () const |
|
|
324 | { |
|
|
325 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
415 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
326 | } |
|
|
327 | }; |
416 | } |
|
|
417 | }; |
328 | |
418 | |
329 | void |
419 | void |
330 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
420 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
331 | { |
421 | { |
332 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
422 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
333 | int outl = 0, outl2; |
423 | int outl = 0, outl2; |
334 | ptype type = PT_DATA_UNCOMPRESSED; |
424 | ptype type = PT_DATA_UNCOMPRESSED; |
335 | |
425 | |
336 | #if ENABLE_COMPRESSION |
426 | #if ENABLE_COMPRESSION |
337 | u8 cdata[MAX_MTU]; |
427 | u8 cdata[MAX_MTU]; |
338 | u32 cl; |
|
|
339 | |
428 | |
|
|
429 | if (conn->features & FEATURE_COMPRESSION) |
|
|
430 | { |
340 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
431 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
432 | |
341 | if (cl) |
433 | if (cl) |
342 | { |
434 | { |
343 | type = PT_DATA_COMPRESSED; |
435 | type = PT_DATA_COMPRESSED; |
344 | d = cdata; |
436 | d = cdata; |
345 | l = cl + 2; |
437 | l = cl + 2; |
346 | |
438 | |
347 | d[0] = cl >> 8; |
439 | d[0] = cl >> 8; |
348 | d[1] = cl; |
440 | d[1] = cl; |
|
|
441 | } |
349 | } |
442 | } |
350 | #endif |
443 | #endif |
351 | |
444 | |
352 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
445 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1)); |
353 | |
446 | |
354 | struct { |
447 | struct { |
355 | #if RAND_SIZE |
448 | #if RAND_SIZE |
356 | u8 rnd[RAND_SIZE]; |
449 | u8 rnd[RAND_SIZE]; |
357 | #endif |
450 | #endif |
358 | u32 seqno; |
451 | u32 seqno; |
359 | } datahdr; |
452 | } datahdr; |
360 | |
453 | |
361 | datahdr.seqno = ntohl (seqno); |
454 | datahdr.seqno = ntohl (seqno); |
362 | #if RAND_SIZE |
455 | #if RAND_SIZE |
363 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
456 | // NB: a constant (per session) random prefix |
|
|
457 | // is likely enough, but we don't take any chances. |
|
|
458 | conn->oiv.get (datahdr.rnd, RAND_SIZE); |
364 | #endif |
459 | #endif |
365 | |
460 | |
366 | EVP_EncryptUpdate (cctx, |
461 | require (EVP_EncryptUpdate (cctx, |
367 | (unsigned char *) data + outl, &outl2, |
462 | (unsigned char *) data + outl, &outl2, |
368 | (unsigned char *) &datahdr, DATAHDR); |
463 | (unsigned char *) &datahdr, DATAHDR)); |
369 | outl += outl2; |
464 | outl += outl2; |
370 | |
465 | |
371 | EVP_EncryptUpdate (cctx, |
466 | require (EVP_EncryptUpdate (cctx, |
372 | (unsigned char *) data + outl, &outl2, |
467 | (unsigned char *) data + outl, &outl2, |
373 | (unsigned char *) d, l); |
468 | (unsigned char *) d, l)); |
374 | outl += outl2; |
469 | outl += outl2; |
375 | |
470 | |
376 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
471 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
377 | outl += outl2; |
472 | outl += outl2; |
378 | |
473 | |
379 | len = outl + data_hdr_size (); |
474 | len = outl + data_hdr_size (); |
380 | |
475 | |
381 | set_hdr (type, dst); |
476 | set_hdr (type, dst); |
… | |
… | |
390 | int outl = 0, outl2; |
485 | int outl = 0, outl2; |
391 | tap_packet *p = new tap_packet; |
486 | tap_packet *p = new tap_packet; |
392 | u8 *d; |
487 | u8 *d; |
393 | u32 l = len - data_hdr_size (); |
488 | u32 l = len - data_hdr_size (); |
394 | |
489 | |
395 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
490 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0)); |
396 | |
491 | |
397 | #if ENABLE_COMPRESSION |
492 | #if ENABLE_COMPRESSION |
398 | u8 cdata[MAX_MTU]; |
493 | u8 cdata[MAX_MTU]; |
399 | |
494 | |
400 | if (type == PT_DATA_COMPRESSED) |
495 | if (type == PT_DATA_COMPRESSED) |
401 | d = cdata; |
496 | d = cdata; |
402 | else |
497 | else |
403 | #endif |
498 | #endif |
404 | d = &(*p)[6 + 6 - DATAHDR]; |
499 | d = &(*p)[6 + 6] - DATAHDR; |
405 | |
500 | |
406 | /* this overwrites part of the src mac, but we fix that later */ |
501 | // we play do evil games with the struct layout atm. |
|
|
502 | // pending better solutions, we at least do some verification. |
|
|
503 | // this is fine, as we left ISO territory long ago. |
|
|
504 | require (DATAHDR <= 16); |
|
|
505 | require ((u8 *)(&p->len + 1) == &(*p)[0]); |
|
|
506 | |
|
|
507 | // this can overwrite the len/dst/src fields |
407 | EVP_DecryptUpdate (cctx, |
508 | require (EVP_DecryptUpdate (cctx, |
408 | d, &outl2, |
509 | d, &outl2, |
409 | (unsigned char *)&data, len - data_hdr_size ()); |
510 | (unsigned char *)&data, len - data_hdr_size ())); |
410 | outl += outl2; |
511 | outl += outl2; |
411 | |
512 | |
412 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
513 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
413 | outl += outl2; |
514 | outl += outl2; |
414 | |
515 | |
415 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
516 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
416 | |
517 | |
417 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
518 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
442 | } |
543 | } |
443 | }; |
544 | }; |
444 | |
545 | |
445 | struct config_packet : vpn_packet |
546 | struct config_packet : vpn_packet |
446 | { |
547 | { |
447 | // actually, hmaclen cannot be checked because the hmac |
548 | u8 serial[SERIAL_SIZE]; |
448 | // field comes before this data, so peers with other |
|
|
449 | // hmacs simply will not work. |
|
|
450 | u8 prot_major, prot_minor, randsize, hmaclen; |
549 | u8 prot_major, prot_minor, randsize; |
451 | u8 flags, challengelen, pad2, pad3; |
550 | u8 flags, features, pad6, pad7, pad8; |
452 | u32 cipher_nid, digest_nid, hmac_nid; |
551 | u32 cipher_nid, mac_nid, auth_nid; |
453 | |
552 | |
454 | const u8 curflags () const |
553 | void setup (ptype type, int dst); |
|
|
554 | bool chk_config (const conf_node *conf, const sockinfo &rsi) const; |
|
|
555 | |
|
|
556 | static u8 get_features () |
455 | { |
557 | { |
|
|
558 | u8 f = 0; |
|
|
559 | #if ENABLE_COMPRESSION |
|
|
560 | f |= FEATURE_COMPRESSION; |
|
|
561 | #endif |
|
|
562 | #if ENABLE_ROHC |
|
|
563 | f |= FEATURE_ROHC; |
|
|
564 | #endif |
|
|
565 | #if ENABLE_BRIDGING |
|
|
566 | f |= FEATURE_BRIDGING; |
|
|
567 | #endif |
456 | return 0x80 |
568 | return f; |
457 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
458 | } |
569 | } |
459 | |
|
|
460 | void setup (ptype type, int dst); |
|
|
461 | bool chk_config () const; |
|
|
462 | }; |
570 | }; |
463 | |
571 | |
|
|
572 | void |
464 | void config_packet::setup (ptype type, int dst) |
573 | config_packet::setup (ptype type, int dst) |
465 | { |
574 | { |
466 | prot_major = PROTOCOL_MAJOR; |
575 | prot_major = PROTOCOL_MAJOR; |
467 | prot_minor = PROTOCOL_MINOR; |
576 | prot_minor = PROTOCOL_MINOR; |
468 | randsize = RAND_SIZE; |
577 | randsize = RAND_SIZE; |
469 | hmaclen = HMACLENGTH; |
578 | flags = 0; |
470 | flags = curflags (); |
579 | features = get_features (); |
471 | challengelen = sizeof (rsachallenge); |
|
|
472 | |
580 | |
|
|
581 | strncpy ((char *)serial, conf.serial, sizeof (serial)); |
|
|
582 | |
473 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
583 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); |
474 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
|
|
475 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
584 | mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); |
|
|
585 | auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); |
476 | |
586 | |
477 | len = sizeof (*this) - sizeof (net_packet); |
587 | len = sizeof (*this) - sizeof (net_packet); |
478 | set_hdr (type, dst); |
588 | set_hdr (type, dst); |
479 | } |
589 | } |
480 | |
590 | |
481 | bool config_packet::chk_config () const |
591 | bool |
|
|
592 | config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const |
482 | { |
593 | { |
483 | if (prot_major != PROTOCOL_MAJOR) |
594 | if (prot_major != PROTOCOL_MAJOR) |
484 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
595 | slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"), |
|
|
596 | conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR); |
485 | else if (randsize != RAND_SIZE) |
597 | else if (randsize != RAND_SIZE) |
486 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
598 | slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"), |
487 | else if (hmaclen != HMACLENGTH) |
599 | conf->nodename, (const char *)rsi, randsize, RAND_SIZE); |
488 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
489 | else if (flags != curflags ()) |
|
|
490 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
491 | else if (challengelen != sizeof (rsachallenge)) |
|
|
492 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
|
|
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
600 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ()))) |
494 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
601 | slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"), |
495 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
602 | conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ())); |
496 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
|
|
497 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
603 | else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ()))) |
498 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
604 | slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"), |
|
|
605 | conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); |
|
|
606 | else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) |
|
|
607 | slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"), |
|
|
608 | conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); |
499 | else |
609 | else |
|
|
610 | { |
|
|
611 | int cmp = memcmp (serial, ::conf.serial, sizeof (serial)); |
|
|
612 | |
|
|
613 | if (cmp > 0) |
|
|
614 | slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"), |
|
|
615 | conf->nodename, (const char *)rsi); |
|
|
616 | else if (cmp == 0) |
500 | return true; |
617 | return true; |
|
|
618 | } |
501 | |
619 | |
502 | return false; |
620 | return false; |
503 | } |
621 | } |
504 | |
622 | |
505 | struct auth_req_packet : config_packet |
623 | struct auth_req_packet : config_packet // UNPROTECTED |
506 | { |
624 | { |
507 | char magic[8]; |
625 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
626 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
627 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
628 | u8 pad2, pad3; |
511 | rsaid id; |
629 | auth_encr encr; |
512 | rsaencrdata encr; |
|
|
513 | |
630 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
631 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
515 | { |
632 | { |
516 | config_packet::setup (PT_AUTH_REQ, dst); |
633 | config_packet::setup (PT_AUTH_REQ, dst); |
517 | strncpy (magic, MAGIC, 8); |
634 | memcpy (magic, MAGIC, 8); |
518 | initiate = !!initiate_; |
635 | initiate = !!initiate_; |
519 | protocols = protocols_; |
636 | protocols = protocols_; |
520 | |
637 | |
521 | len = sizeof (*this) - sizeof (net_packet); |
638 | len = sizeof (*this) - sizeof (net_packet); |
522 | } |
639 | } |
523 | }; |
640 | }; |
524 | |
641 | |
525 | struct auth_res_packet : config_packet |
642 | struct auth_res_packet : vpn_packet // UNPROTECTED |
526 | { |
643 | { |
527 | rsaid id; |
|
|
528 | u8 pad1, pad2, pad3; |
|
|
529 | u8 response_len; // encrypted length |
|
|
530 | rsaresponse response; |
644 | auth_response response; |
531 | |
645 | |
532 | auth_res_packet (int dst) |
646 | auth_res_packet (int dst) |
533 | { |
647 | { |
534 | config_packet::setup (PT_AUTH_RES, dst); |
648 | set_hdr (PT_AUTH_RES, dst); |
535 | |
649 | |
536 | len = sizeof (*this) - sizeof (net_packet); |
650 | len = sizeof (*this) - sizeof (net_packet); |
537 | } |
651 | } |
538 | }; |
652 | }; |
539 | |
653 | |
… | |
… | |
569 | }; |
683 | }; |
570 | |
684 | |
571 | ///////////////////////////////////////////////////////////////////////////// |
685 | ///////////////////////////////////////////////////////////////////////////// |
572 | |
686 | |
573 | void |
687 | void |
574 | connection::connection_established () |
688 | connection::connection_established (const sockinfo &rsi) |
575 | { |
689 | { |
|
|
690 | if (!have_snd_auth || !have_rcv_auth) |
|
|
691 | return; |
|
|
692 | |
|
|
693 | si = rsi; |
|
|
694 | protocol = rsi.prot; |
|
|
695 | |
|
|
696 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
697 | conf->nodename, (const char *)rsi, |
|
|
698 | is_direct ? "direct" : "forwarded", |
|
|
699 | PROTOCOL_MAJOR, prot_minor); |
|
|
700 | |
|
|
701 | if (::conf.script_node_up) |
|
|
702 | { |
|
|
703 | run_script_cb *cb = new run_script_cb; |
|
|
704 | cb->set<connection, &connection::script_node_up> (this); |
|
|
705 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
706 | } |
|
|
707 | |
|
|
708 | delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0); |
|
|
709 | iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); |
|
|
710 | |
|
|
711 | delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); |
|
|
712 | oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; |
|
|
713 | |
|
|
714 | oiv.reset (); |
|
|
715 | |
|
|
716 | // make sure rekeying timeouts are slightly asymmetric |
|
|
717 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
|
|
718 | rekey.start (rekey_interval, rekey_interval); |
|
|
719 | |
|
|
720 | keepalive.start (::conf.keepalive); |
|
|
721 | |
|
|
722 | // send queued packets |
576 | if (ictx && octx) |
723 | if (ictx && octx) |
577 | { |
724 | { |
578 | connectmode = conf->connectmode; |
725 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
579 | |
|
|
580 | rekey.start (NOW + ::conf.rekey); |
|
|
581 | keepalive.start (NOW + ::conf.keepalive); |
|
|
582 | |
|
|
583 | // send queued packets |
|
|
584 | if (ictx && octx) |
|
|
585 | { |
726 | { |
586 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
|
|
587 | { |
|
|
588 | send_data_packet (p); |
727 | if (p->len) send_data_packet (p); |
589 | delete p; |
728 | delete p; |
590 | } |
|
|
591 | |
|
|
592 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
593 | { |
|
|
594 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
595 | delete p; |
|
|
596 | } |
|
|
597 | } |
729 | } |
|
|
730 | |
|
|
731 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
732 | { |
|
|
733 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
734 | delete p; |
|
|
735 | } |
598 | } |
736 | } |
|
|
737 | |
|
|
738 | vpn->connection_established (this); |
|
|
739 | } |
|
|
740 | |
|
|
741 | void |
|
|
742 | connection::reset_si () |
|
|
743 | { |
|
|
744 | if (vpn->can_direct (THISNODE, conf)) |
|
|
745 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
599 | else |
746 | else |
600 | { |
747 | { |
601 | retry_cnt = 0; |
748 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
602 | establish_connection.start (NOW + 5); |
749 | protocol = 0; |
603 | keepalive.stop (); |
|
|
604 | rekey.stop (); |
|
|
605 | } |
750 | } |
606 | } |
|
|
607 | |
|
|
608 | void |
|
|
609 | connection::reset_si () |
|
|
610 | { |
|
|
611 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
|
|
612 | |
|
|
613 | // mask out protocols we cannot establish |
|
|
614 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
615 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
616 | |
751 | |
617 | si.set (conf, protocol); |
752 | si.set (conf, protocol); |
|
|
753 | |
|
|
754 | is_direct = si.valid (); |
618 | } |
755 | } |
619 | |
756 | |
620 | // ensure sockinfo is valid, forward if necessary |
757 | // ensure sockinfo is valid, forward if necessary |
621 | const sockinfo & |
758 | const sockinfo & |
622 | connection::forward_si (const sockinfo &si) const |
759 | connection::forward_si (const sockinfo &si) const |
623 | { |
760 | { |
624 | if (!si.valid ()) |
761 | if (!si.valid ()) |
625 | { |
762 | { |
626 | connection *r = vpn->find_router (); |
763 | connection *r = vpn->find_router_for (this); |
627 | |
764 | |
628 | if (r) |
765 | if (r) |
629 | { |
766 | { |
630 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
767 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
631 | conf->nodename, r->conf->nodename); |
768 | conf->nodename, r->conf->nodename); |
632 | return r->si; |
769 | return r->si; |
633 | } |
770 | } |
634 | else |
771 | else |
635 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
772 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
636 | conf->nodename); |
773 | conf->nodename); |
637 | } |
774 | } |
638 | |
775 | |
639 | return si; |
776 | return si; |
640 | } |
777 | } |
… | |
… | |
650 | connection::send_ping (const sockinfo &si, u8 pong) |
787 | connection::send_ping (const sockinfo &si, u8 pong) |
651 | { |
788 | { |
652 | ping_packet *pkt = new ping_packet; |
789 | ping_packet *pkt = new ping_packet; |
653 | |
790 | |
654 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
791 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
792 | |
|
|
793 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
655 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
794 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
656 | |
795 | |
657 | delete pkt; |
796 | delete pkt; |
658 | } |
797 | } |
659 | |
798 | |
… | |
… | |
674 | void |
813 | void |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
814 | connection::send_auth_request (const sockinfo &si, bool initiate) |
676 | { |
815 | { |
677 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
816 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
678 | |
817 | |
679 | rsachallenge chg; |
818 | generate_auth_data (); |
680 | rsa_cache.gen (pkt->id, chg); |
|
|
681 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
819 | auth_encrypt (conf->rsa_key, snd_auth, pkt->encr); |
682 | |
820 | |
683 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
821 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
684 | |
|
|
685 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
822 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
686 | |
823 | |
687 | delete pkt; |
824 | delete pkt; |
688 | } |
825 | } |
689 | |
826 | |
690 | void |
827 | void |
691 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
828 | connection::send_auth_response (const sockinfo &si) |
692 | { |
829 | { |
693 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
830 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
694 | |
831 | |
695 | pkt->id = id; |
832 | memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b); |
|
|
833 | auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac); |
696 | |
834 | |
697 | rsa_hash (id, chg, pkt->response); |
|
|
698 | |
|
|
699 | pkt->hmac_set (octx); |
|
|
700 | |
|
|
701 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
835 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
702 | |
|
|
703 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
836 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
704 | |
837 | |
705 | delete pkt; |
838 | delete pkt; |
706 | } |
839 | } |
707 | |
840 | |
708 | void |
841 | void |
709 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
842 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
710 | { |
843 | { |
711 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
844 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
712 | conf->id, rid, (const char *)rsi); |
845 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
846 | conf->protocols); |
713 | |
847 | |
714 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
848 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
715 | |
849 | |
716 | r->hmac_set (octx); |
850 | r->hmac_set (octx); |
717 | send_vpn_packet (r, si); |
851 | send_vpn_packet (r, si); |
718 | |
852 | |
719 | delete r; |
853 | delete r; |
720 | } |
854 | } |
721 | |
855 | |
722 | void |
856 | inline void |
723 | connection::establish_connection_cb (time_watcher &w) |
857 | connection::establish_connection_cb (ev::timer &w, int revents) |
724 | { |
858 | { |
725 | if (!ictx |
859 | if (!(ictx && octx) |
726 | && conf != THISNODE |
860 | && conf != THISNODE |
727 | && connectmode != conf_node::C_NEVER |
861 | && connectmode != conf_node::C_NEVER |
728 | && connectmode != conf_node::C_DISABLED |
862 | && connectmode != conf_node::C_DISABLED |
729 | && NOW > w.at) |
863 | && !w.is_active ()) |
730 | { |
864 | { |
731 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
865 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
732 | |
866 | // and stop trying. should probably be handled by a per-connection expire handler. |
733 | if (retry_int < 3600 * 8) |
867 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
868 | { |
|
|
869 | reset_connection (); |
734 | retry_cnt++; |
870 | return; |
|
|
871 | } |
735 | |
872 | |
736 | w.start (NOW + retry_int); |
873 | last_establish_attempt = ev_now (); |
|
|
874 | |
|
|
875 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
|
|
876 | ? (retry_cnt & 3) + 1 |
|
|
877 | : 1 << (retry_cnt >> 2)); |
737 | |
878 | |
738 | reset_si (); |
879 | reset_si (); |
739 | |
880 | |
740 | if (si.prot && !si.host) |
881 | bool slow = si.prot & PROT_SLOW; |
|
|
882 | |
|
|
883 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
|
|
884 | { |
|
|
885 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
886 | w.start (1); |
741 | vpn->send_connect_request (conf->id); |
887 | vpn->send_connect_request (this); |
|
|
888 | } |
742 | else |
889 | else |
743 | { |
890 | { |
|
|
891 | if (si.valid ()) |
|
|
892 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
893 | conf->nodename, (const char *)si); |
|
|
894 | |
744 | const sockinfo &dsi = forward_si (si); |
895 | const sockinfo &dsi = forward_si (si); |
|
|
896 | |
|
|
897 | slow = slow || (dsi.prot & PROT_SLOW); |
745 | |
898 | |
746 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
899 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
747 | { |
900 | { |
748 | if (retry_cnt < 4) |
901 | if (retry_cnt < 4) |
749 | send_auth_request (dsi, true); |
902 | send_auth_request (dsi, true); |
750 | else |
903 | else |
751 | send_ping (dsi, 0); |
904 | send_ping (dsi, 0); |
752 | } |
905 | } |
753 | } |
906 | } |
|
|
907 | |
|
|
908 | retry_int *= slow ? 8. : 0.9; |
|
|
909 | |
|
|
910 | if (retry_int < conf->max_retry) |
|
|
911 | retry_cnt++; |
|
|
912 | else |
|
|
913 | retry_int = conf->max_retry; |
|
|
914 | |
|
|
915 | w.start (retry_int); |
754 | } |
916 | } |
755 | } |
917 | } |
756 | |
918 | |
757 | void |
919 | void |
758 | connection::reset_connection () |
920 | connection::reset_connection () |
… | |
… | |
761 | { |
923 | { |
762 | slog (L_INFO, _("%s(%s): connection lost"), |
924 | slog (L_INFO, _("%s(%s): connection lost"), |
763 | conf->nodename, (const char *)si); |
925 | conf->nodename, (const char *)si); |
764 | |
926 | |
765 | if (::conf.script_node_down) |
927 | if (::conf.script_node_down) |
766 | run_script (run_script_cb (this, &connection::script_node_down), false); |
928 | { |
|
|
929 | run_script_cb *cb = new run_script_cb; |
|
|
930 | cb->set<connection, &connection::script_node_down> (this); |
|
|
931 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
932 | } |
767 | } |
933 | } |
768 | |
934 | |
769 | delete ictx; ictx = 0; |
935 | delete ictx; ictx = 0; |
770 | delete octx; octx = 0; |
936 | delete octx; octx = 0; |
771 | |
937 | |
772 | si.host= 0; |
938 | si.host = 0; |
773 | |
939 | |
|
|
940 | have_snd_auth = false; |
|
|
941 | have_rcv_auth = false; |
|
|
942 | auth_expire = 0.; |
|
|
943 | |
774 | last_activity = 0; |
944 | last_activity = 0.; |
|
|
945 | //last_si_change = 0.; |
775 | retry_cnt = 0; |
946 | retry_cnt = 0; |
776 | |
947 | |
777 | rekey.stop (); |
948 | rekey.stop (); |
778 | keepalive.stop (); |
949 | keepalive.stop (); |
779 | establish_connection.stop (); |
950 | establish_connection.stop (); |
… | |
… | |
786 | send_reset (si); |
957 | send_reset (si); |
787 | |
958 | |
788 | reset_connection (); |
959 | reset_connection (); |
789 | } |
960 | } |
790 | |
961 | |
791 | void |
962 | // poor-man's rekeying |
792 | connection::rekey_cb (time_watcher &w) |
963 | inline void |
|
|
964 | connection::rekey_cb (ev::timer &w, int revents) |
793 | { |
965 | { |
794 | reset_connection (); |
966 | reset_connection (); |
795 | establish_connection (); |
967 | establish_connection (); |
796 | } |
968 | } |
797 | |
969 | |
… | |
… | |
813 | if (oseqno > MAX_SEQNO) |
985 | if (oseqno > MAX_SEQNO) |
814 | rekey (); |
986 | rekey (); |
815 | } |
987 | } |
816 | |
988 | |
817 | void |
989 | void |
|
|
990 | connection::post_inject_queue () |
|
|
991 | { |
|
|
992 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
993 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
994 | establish_connection.stop (); |
|
|
995 | |
|
|
996 | establish_connection (); |
|
|
997 | } |
|
|
998 | |
|
|
999 | void |
818 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
1000 | connection::inject_data_packet (tap_packet *pkt) |
819 | { |
1001 | { |
820 | if (ictx && octx) |
1002 | if (ictx && octx) |
821 | send_data_packet (pkt); |
1003 | send_data_packet (pkt); |
822 | else |
1004 | else |
823 | { |
1005 | { |
824 | if (!broadcast)//DDDD |
|
|
825 | data_queue.put (new tap_packet (*pkt)); |
1006 | data_queue.put (new tap_packet (*pkt)); |
826 | |
1007 | post_inject_queue (); |
827 | establish_connection (); |
|
|
828 | } |
1008 | } |
829 | } |
1009 | } |
830 | |
1010 | |
|
|
1011 | void |
831 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1012 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
832 | { |
1013 | { |
833 | if (ictx && octx) |
1014 | if (ictx && octx) |
834 | send_vpn_packet (pkt, si, tos); |
1015 | send_vpn_packet (pkt, si, tos); |
835 | else |
1016 | else |
836 | { |
1017 | { |
837 | vpn_queue.put (new vpn_packet (*pkt)); |
1018 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
838 | |
1019 | post_inject_queue (); |
839 | establish_connection (); |
|
|
840 | } |
1020 | } |
841 | } |
1021 | } |
842 | |
1022 | |
843 | void |
1023 | void |
844 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1024 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
845 | { |
1025 | { |
846 | last_activity = NOW; |
1026 | last_activity = ev_now (); |
847 | |
1027 | |
848 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1028 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
849 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1029 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1030 | |
|
|
1031 | if (connectmode == conf_node::C_DISABLED) |
|
|
1032 | return; |
850 | |
1033 | |
851 | switch (pkt->typ ()) |
1034 | switch (pkt->typ ()) |
852 | { |
1035 | { |
853 | case vpn_packet::PT_PING: |
1036 | case vpn_packet::PT_PING: |
|
|
1037 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1038 | |
854 | // we send pings instead of auth packets after some retries, |
1039 | // we send pings instead of auth packets after some retries, |
855 | // so reset the retry counter and establish a connection |
1040 | // so reset the retry counter and establish a connection |
856 | // when we receive a ping. |
1041 | // when we receive a ping. |
857 | if (!ictx) |
1042 | if (!ictx) |
858 | { |
1043 | { |
859 | if (auth_rate_limiter.can (rsi)) |
1044 | if (auth_rate_limiter.can (rsi)) |
860 | send_auth_request (rsi, true); |
1045 | send_auth_request (rsi, true); |
861 | } |
1046 | } |
862 | else |
1047 | else |
|
|
1048 | // we would love to change the socket address here, but ping's aren't |
|
|
1049 | // authenticated, so we best ignore it. |
863 | send_ping (rsi, 1); // pong |
1050 | send_ping (rsi, 1); // pong |
864 | |
1051 | |
865 | break; |
1052 | break; |
866 | |
1053 | |
867 | case vpn_packet::PT_PONG: |
1054 | case vpn_packet::PT_PONG: |
|
|
1055 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1056 | |
|
|
1057 | // a PONG might mean that the other side doesn't really know |
|
|
1058 | // about our desire for communication. |
|
|
1059 | establish_connection (); |
868 | break; |
1060 | break; |
869 | |
1061 | |
870 | case vpn_packet::PT_RESET: |
1062 | case vpn_packet::PT_RESET: |
871 | { |
1063 | { |
872 | reset_connection (); |
1064 | reset_connection (); |
873 | |
1065 | |
874 | config_packet *p = (config_packet *) pkt; |
1066 | config_packet *p = (config_packet *) pkt; |
875 | |
1067 | |
876 | if (!p->chk_config ()) |
1068 | if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS) |
877 | { |
|
|
878 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
|
|
879 | conf->nodename, (const char *)rsi); |
|
|
880 | connectmode = conf_node::C_DISABLED; |
|
|
881 | } |
|
|
882 | else if (connectmode == conf_node::C_ALWAYS) |
|
|
883 | establish_connection (); |
1069 | establish_connection (); |
884 | } |
1070 | } |
885 | break; |
1071 | break; |
886 | |
1072 | |
887 | case vpn_packet::PT_AUTH_REQ: |
1073 | case vpn_packet::PT_AUTH_REQ: |
888 | if (auth_rate_limiter.can (rsi)) |
1074 | if (auth_rate_limiter.can (rsi)) |
889 | { |
1075 | { |
890 | auth_req_packet *p = (auth_req_packet *) pkt; |
1076 | auth_req_packet *p = (auth_req_packet *)pkt; |
891 | |
1077 | |
892 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1078 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1079 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1080 | p->protocols, p->features); |
893 | |
1081 | |
894 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1082 | if (memcmp (p->magic, MAGIC, 8)) |
|
|
1083 | { |
|
|
1084 | slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"), |
|
|
1085 | conf->nodename, (const char *)rsi); |
|
|
1086 | } |
|
|
1087 | else if (p->chk_config (conf, rsi)) |
895 | { |
1088 | { |
896 | if (p->prot_minor != PROTOCOL_MINOR) |
1089 | if (p->prot_minor != PROTOCOL_MINOR) |
897 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1090 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
898 | conf->nodename, (const char *)rsi, |
1091 | conf->nodename, (const char *)rsi, |
899 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1092 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
900 | |
1093 | |
901 | if (p->initiate) |
1094 | if (p->initiate) |
902 | send_auth_request (rsi, false); |
1095 | send_auth_request (rsi, false); |
903 | |
1096 | |
904 | rsachallenge k; |
1097 | auth_data auth; |
905 | |
1098 | |
906 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
1099 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
907 | { |
1100 | { |
908 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1101 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
909 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1102 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
910 | break; |
|
|
911 | } |
1103 | } |
912 | else |
1104 | else |
913 | { |
1105 | { |
914 | delete octx; |
1106 | bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth); |
915 | |
1107 | |
916 | octx = new crypto_ctx (k, 1); |
1108 | rcv_auth = auth; |
917 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1109 | have_rcv_auth = true; |
918 | |
1110 | |
|
|
1111 | send_auth_response (rsi); |
|
|
1112 | |
|
|
1113 | if (chg) |
|
|
1114 | { |
919 | conf->protocols = p->protocols; |
1115 | conf->protocols = p->protocols; |
|
|
1116 | features = p->features & config_packet::get_features (); |
920 | |
1117 | |
921 | send_auth_response (rsi, p->id, k); |
|
|
922 | |
|
|
923 | connection_established (); |
1118 | connection_established (rsi); |
924 | |
|
|
925 | break; |
1119 | } |
926 | } |
1120 | } |
|
|
1121 | |
|
|
1122 | break; |
927 | } |
1123 | } |
928 | else |
|
|
929 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
|
|
930 | conf->nodename, (const char *)rsi); |
|
|
931 | |
1124 | |
932 | send_reset (rsi); |
1125 | send_reset (rsi); |
933 | } |
1126 | } |
934 | |
1127 | |
935 | break; |
1128 | break; |
936 | |
1129 | |
937 | case vpn_packet::PT_AUTH_RES: |
1130 | case vpn_packet::PT_AUTH_RES: |
938 | { |
1131 | { |
939 | auth_res_packet *p = (auth_res_packet *) pkt; |
1132 | auth_res_packet *p = (auth_res_packet *)pkt; |
940 | |
1133 | |
941 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1134 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
942 | |
1135 | |
943 | if (p->chk_config ()) |
1136 | auth_mac local_mac; |
|
|
1137 | auth_hash (snd_auth, p->response.ecdh, local_mac); |
|
|
1138 | |
|
|
1139 | if (memcmp (&p->response.mac, local_mac, sizeof local_mac)) |
944 | { |
1140 | { |
945 | if (p->prot_minor != PROTOCOL_MINOR) |
|
|
946 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
947 | conf->nodename, (const char *)rsi, |
|
|
948 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
949 | |
|
|
950 | rsachallenge chg; |
|
|
951 | |
|
|
952 | if (!rsa_cache.find (p->id, chg)) |
|
|
953 | { |
|
|
954 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1141 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
955 | conf->nodename, (const char *)rsi); |
1142 | conf->nodename, (const char *)rsi); |
956 | break; |
|
|
957 | } |
1143 | } |
958 | else |
1144 | else if (!have_snd_auth) |
959 | { |
1145 | { |
960 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1146 | memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b); |
961 | |
1147 | |
962 | if (!p->hmac_chk (cctx)) |
1148 | have_snd_auth = true; |
963 | { |
|
|
964 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
965 | "could be an attack, or just corruption or a synchronization error"), |
|
|
966 | conf->nodename, (const char *)rsi); |
|
|
967 | break; |
|
|
968 | } |
|
|
969 | else |
|
|
970 | { |
|
|
971 | rsaresponse h; |
|
|
972 | |
|
|
973 | rsa_hash (p->id, chg, h); |
|
|
974 | |
|
|
975 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
976 | { |
|
|
977 | prot_minor = p->prot_minor; |
|
|
978 | |
|
|
979 | delete ictx; ictx = cctx; |
|
|
980 | |
|
|
981 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
982 | |
|
|
983 | si = rsi; |
|
|
984 | protocol = rsi.prot; |
|
|
985 | |
|
|
986 | connection_established (); |
1149 | connection_established (rsi); |
987 | |
|
|
988 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
989 | conf->nodename, (const char *)rsi, |
|
|
990 | p->prot_major, p->prot_minor); |
|
|
991 | |
|
|
992 | if (::conf.script_node_up) |
|
|
993 | run_script (run_script_cb (this, &connection::script_node_up), false); |
|
|
994 | |
|
|
995 | break; |
|
|
996 | } |
|
|
997 | else |
|
|
998 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
999 | conf->nodename, (const char *)rsi); |
|
|
1000 | } |
|
|
1001 | |
|
|
1002 | delete cctx; |
|
|
1003 | } |
|
|
1004 | } |
1150 | } |
1005 | } |
1151 | } |
1006 | |
|
|
1007 | send_reset (rsi); |
|
|
1008 | break; |
1152 | break; |
1009 | |
1153 | |
1010 | case vpn_packet::PT_DATA_COMPRESSED: |
1154 | case vpn_packet::PT_DATA_COMPRESSED: |
1011 | #if !ENABLE_COMPRESSION |
1155 | #if !ENABLE_COMPRESSION |
1012 | send_reset (rsi); |
1156 | send_reset (rsi); |
… | |
… | |
1019 | { |
1163 | { |
1020 | vpndata_packet *p = (vpndata_packet *)pkt; |
1164 | vpndata_packet *p = (vpndata_packet *)pkt; |
1021 | |
1165 | |
1022 | if (!p->hmac_chk (ictx)) |
1166 | if (!p->hmac_chk (ictx)) |
1023 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1167 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1024 | "could be an attack, or just corruption or a synchronization error"), |
1168 | "could be an attack, or just corruption or a synchronization error."), |
1025 | conf->nodename, (const char *)rsi); |
1169 | conf->nodename, (const char *)rsi); |
1026 | else |
1170 | else |
1027 | { |
1171 | { |
1028 | u32 seqno; |
1172 | u32 seqno; |
1029 | tap_packet *d = p->unpack (this, seqno); |
1173 | tap_packet *d = p->unpack (this, seqno); |
|
|
1174 | int seqclass = iseqno.seqno_classify (seqno); |
1030 | |
1175 | |
1031 | if (iseqno.recv_ok (seqno)) |
1176 | if (seqclass == 0) // ok |
1032 | { |
1177 | { |
1033 | vpn->tap->send (d); |
1178 | vpn->tap->send (d); |
1034 | |
1179 | |
1035 | if (si != rsi) |
1180 | if (si != rsi) |
1036 | { |
1181 | { |
1037 | // fast re-sync on connection changes, useful especially for tcp/ip |
1182 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1183 | //if (last_si_change < ev_now () + 5.) |
1038 | si = rsi; |
1184 | // { |
1039 | |
|
|
1040 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1185 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1041 | conf->nodename, (const char *)si, (const char *)rsi); |
1186 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1187 | |
|
|
1188 | si = rsi; |
|
|
1189 | |
|
|
1190 | if (::conf.script_node_change) |
|
|
1191 | { |
|
|
1192 | run_script_cb *cb = new run_script_cb; |
|
|
1193 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1194 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1195 | } |
|
|
1196 | |
|
|
1197 | // } |
|
|
1198 | //else |
|
|
1199 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1200 | // conf->nodename, (const char *)si, (const char *)rsi); |
1042 | } |
1201 | } |
1043 | |
|
|
1044 | delete d; |
|
|
1045 | |
|
|
1046 | break; |
|
|
1047 | } |
1202 | } |
|
|
1203 | else if (seqclass == 1) // far history |
|
|
1204 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1205 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1206 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1207 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1208 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1209 | else if (seqclass == 3) // reset |
|
|
1210 | { |
|
|
1211 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1212 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1213 | send_reset (rsi); |
|
|
1214 | } |
|
|
1215 | |
|
|
1216 | delete d; |
|
|
1217 | break; |
1048 | } |
1218 | } |
1049 | } |
1219 | } |
1050 | |
1220 | |
1051 | send_reset (rsi); |
1221 | send_reset (rsi); |
1052 | break; |
1222 | break; |
1053 | |
1223 | |
1054 | case vpn_packet::PT_CONNECT_REQ: |
1224 | case vpn_packet::PT_CONNECT_REQ: |
1055 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1225 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1056 | { |
1226 | { |
1057 | connect_req_packet *p = (connect_req_packet *) pkt; |
1227 | connect_req_packet *p = (connect_req_packet *)pkt; |
1058 | |
1228 | |
1059 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1229 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1060 | connection *c = vpn->conns[p->id - 1]; |
|
|
1061 | conf->protocols = p->protocols; |
|
|
1062 | |
|
|
1063 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1064 | conf->id, p->id, c->ictx && c->octx); |
|
|
1065 | |
|
|
1066 | if (c->ictx && c->octx) |
|
|
1067 | { |
1230 | { |
|
|
1231 | connection *c = vpn->conns[p->id - 1]; |
|
|
1232 | conf->protocols = p->protocols; |
|
|
1233 | |
|
|
1234 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1235 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1236 | p->protocols, |
|
|
1237 | c->ictx && c->octx); |
|
|
1238 | |
|
|
1239 | if (c->ictx && c->octx) |
|
|
1240 | { |
1068 | // send connect_info packets to both sides, in case one is |
1241 | // send connect_info packets to both sides, in case one is |
1069 | // behind a nat firewall (or both ;) |
1242 | // behind a nat firewall (or both ;) |
1070 | c->send_connect_info (conf->id, si, conf->protocols); |
1243 | c->send_connect_info (conf->id, si, conf->protocols); |
1071 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1244 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1245 | } |
|
|
1246 | else |
|
|
1247 | c->establish_connection (); |
1072 | } |
1248 | } |
1073 | else |
1249 | else |
1074 | c->establish_connection (); |
1250 | slog (L_WARN, |
|
|
1251 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1252 | p->id); |
1075 | } |
1253 | } |
1076 | |
1254 | |
1077 | break; |
1255 | break; |
1078 | |
1256 | |
1079 | case vpn_packet::PT_CONNECT_INFO: |
1257 | case vpn_packet::PT_CONNECT_INFO: |
1080 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1258 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1081 | { |
1259 | { |
1082 | connect_info_packet *p = (connect_info_packet *) pkt; |
1260 | connect_info_packet *p = (connect_info_packet *)pkt; |
1083 | |
1261 | |
1084 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1262 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1085 | |
1263 | { |
1086 | connection *c = vpn->conns[p->id - 1]; |
1264 | connection *c = vpn->conns[p->id - 1]; |
1087 | |
1265 | |
1088 | c->conf->protocols = p->protocols; |
1266 | c->conf->protocols = p->protocols; |
1089 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1267 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1090 | p->si.upgrade_protocol (protocol, c->conf); |
1268 | p->si.upgrade_protocol (protocol, c->conf); |
1091 | |
1269 | |
1092 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1270 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1093 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1271 | conf->nodename, |
|
|
1272 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1273 | (const char *)p->si, |
|
|
1274 | p->protocols, |
|
|
1275 | protocol, |
|
|
1276 | p->si.supported_protocols (c->conf), |
|
|
1277 | !c->ictx && !c->octx); |
1094 | |
1278 | |
1095 | const sockinfo &dsi = forward_si (p->si); |
1279 | const sockinfo &dsi = forward_si (p->si); |
1096 | |
1280 | |
1097 | if (dsi.valid ()) |
1281 | if (dsi.valid ()) |
1098 | c->send_auth_request (dsi, true); |
1282 | c->send_auth_request (dsi, true); |
|
|
1283 | else |
|
|
1284 | slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
|
|
1285 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1286 | (const char *)p->si); |
|
|
1287 | } |
|
|
1288 | else |
|
|
1289 | slog (L_WARN, |
|
|
1290 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1291 | p->id); |
1099 | } |
1292 | } |
1100 | |
1293 | |
1101 | break; |
1294 | break; |
1102 | |
1295 | |
1103 | default: |
1296 | default: |
1104 | send_reset (rsi); |
1297 | send_reset (rsi); |
1105 | break; |
1298 | break; |
1106 | } |
1299 | } |
1107 | } |
1300 | } |
1108 | |
1301 | |
1109 | void connection::keepalive_cb (time_watcher &w) |
1302 | inline void |
|
|
1303 | connection::keepalive_cb (ev::timer &w, int revents) |
1110 | { |
1304 | { |
1111 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1305 | ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
|
|
1306 | |
|
|
1307 | if (when >= 0) |
|
|
1308 | w.start (when); |
|
|
1309 | else if (when < -15) |
1112 | { |
1310 | { |
1113 | reset_connection (); |
1311 | reset_connection (); |
1114 | establish_connection (); |
1312 | establish_connection (); |
1115 | } |
1313 | } |
1116 | else if (NOW < last_activity + ::conf.keepalive) |
|
|
1117 | w.start (last_activity + ::conf.keepalive); |
|
|
1118 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1314 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1119 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1315 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1120 | { |
1316 | { |
|
|
1317 | w.start (3); |
1121 | send_ping (si); |
1318 | send_ping (si); |
1122 | w.start (NOW + 5); |
|
|
1123 | } |
1319 | } |
1124 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1320 | else if (when >= -10) |
1125 | // hold ondemand connections implicitly a few seconds longer |
1321 | // hold ondemand connections implicitly a few seconds longer |
1126 | // should delete octx, though, or something like that ;) |
1322 | // should delete octx, though, or something like that ;) |
1127 | w.start (last_activity + ::conf.keepalive + 10); |
1323 | w.start (when + 10); |
1128 | else |
1324 | else |
1129 | reset_connection (); |
1325 | reset_connection (); |
1130 | } |
1326 | } |
1131 | |
1327 | |
|
|
1328 | void |
1132 | void connection::send_connect_request (int id) |
1329 | connection::send_connect_request (int id) |
1133 | { |
1330 | { |
1134 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1331 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1135 | |
1332 | |
1136 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1333 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1334 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1335 | THISNODE->protocols); |
1137 | p->hmac_set (octx); |
1336 | p->hmac_set (octx); |
1138 | send_vpn_packet (p, si); |
1337 | send_vpn_packet (p, si); |
1139 | |
1338 | |
1140 | delete p; |
1339 | delete p; |
1141 | } |
1340 | } |
1142 | |
1341 | |
1143 | void connection::script_node () |
1342 | void |
|
|
1343 | connection::script_init_env (const char *ext) |
1144 | { |
1344 | { |
1145 | vpn->script_if_up (); |
|
|
1146 | |
|
|
1147 | char *env; |
1345 | char *env; |
|
|
1346 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1347 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1348 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1349 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1350 | conf->id & 0xff); putenv (env); |
|
|
1351 | } |
|
|
1352 | |
|
|
1353 | void |
|
|
1354 | connection::script_init_connect_env () |
|
|
1355 | { |
|
|
1356 | vpn->script_init_env (); |
|
|
1357 | |
|
|
1358 | char *env; |
1148 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1359 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1360 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1149 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1361 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1150 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1362 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1151 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1363 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1152 | } |
1364 | } |
1153 | |
1365 | |
|
|
1366 | inline const char * |
1154 | const char *connection::script_node_up () |
1367 | connection::script_node_up () |
1155 | { |
1368 | { |
1156 | script_node (); |
1369 | script_init_connect_env (); |
1157 | |
1370 | |
1158 | putenv ("STATE=up"); |
1371 | putenv ((char *)"STATE=up"); |
1159 | |
1372 | |
|
|
1373 | char *filename; |
|
|
1374 | asprintf (&filename, |
|
|
1375 | "%s/%s", |
|
|
1376 | confbase, |
1160 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1377 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1161 | } |
|
|
1162 | |
1378 | |
|
|
1379 | return filename; |
|
|
1380 | } |
|
|
1381 | |
|
|
1382 | inline const char * |
|
|
1383 | connection::script_node_change () |
|
|
1384 | { |
|
|
1385 | script_init_connect_env (); |
|
|
1386 | |
|
|
1387 | putenv ((char *)"STATE=change"); |
|
|
1388 | |
|
|
1389 | char *filename; |
|
|
1390 | asprintf (&filename, |
|
|
1391 | "%s/%s", |
|
|
1392 | confbase, |
|
|
1393 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
|
|
1394 | |
|
|
1395 | return filename; |
|
|
1396 | } |
|
|
1397 | |
|
|
1398 | inline const char * |
1163 | const char *connection::script_node_down () |
1399 | connection::script_node_down () |
1164 | { |
1400 | { |
1165 | script_node (); |
1401 | script_init_connect_env (); |
1166 | |
1402 | |
1167 | putenv ("STATE=down"); |
1403 | putenv ((char *)"STATE=down"); |
1168 | |
1404 | |
1169 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1405 | char *filename; |
1170 | } |
1406 | asprintf (&filename, |
|
|
1407 | "%s/%s", |
|
|
1408 | confbase, |
|
|
1409 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1171 | |
1410 | |
|
|
1411 | return filename; |
|
|
1412 | } |
|
|
1413 | |
1172 | connection::connection(struct vpn *vpn_) |
1414 | connection::connection (struct vpn *vpn, conf_node *conf) |
1173 | : vpn(vpn_) |
1415 | : vpn(vpn), conf(conf), |
1174 | , rekey (this, &connection::rekey_cb) |
1416 | #if ENABLE_DNS |
1175 | , keepalive (this, &connection::keepalive_cb) |
1417 | dns (0), |
|
|
1418 | #endif |
|
|
1419 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1420 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
|
|
1421 | { |
|
|
1422 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1423 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1176 | , establish_connection (this, &connection::establish_connection_cb) |
1424 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1177 | { |
1425 | |
|
|
1426 | last_establish_attempt = 0.; |
1178 | octx = ictx = 0; |
1427 | octx = ictx = 0; |
1179 | retry_cnt = 0; |
|
|
1180 | |
1428 | |
1181 | connectmode = conf_node::C_ALWAYS; // initial setting |
1429 | connectmode = conf->connectmode; |
|
|
1430 | |
|
|
1431 | // queue a dummy packet to force an initial connection attempt |
|
|
1432 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1433 | vpn_queue.put (new net_packet); |
|
|
1434 | |
1182 | reset_connection (); |
1435 | reset_connection (); |
1183 | } |
1436 | } |
1184 | |
1437 | |
1185 | connection::~connection () |
1438 | connection::~connection () |
1186 | { |
1439 | { |
1187 | shutdown (); |
1440 | shutdown (); |
1188 | } |
1441 | } |
1189 | |
1442 | |
|
|
1443 | void |
1190 | void connection_init () |
1444 | connection_init () |
1191 | { |
1445 | { |
1192 | auth_rate_limiter.clear (); |
1446 | auth_rate_limiter.clear (); |
1193 | reset_rate_limiter.clear (); |
1447 | reset_rate_limiter.clear (); |
1194 | } |
1448 | } |
1195 | |
1449 | |