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1
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1 /***************************************************************************
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2 * Copyright (C) 2005 by 510 Software Group *
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3 * *
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4 * *
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5 * This program is free software; you can redistribute it and/or modify *
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6 * it under the terms of the GNU General Public License as published by *
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7 * the Free Software Foundation; either version 2 of the License, or *
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8 * (at your option) any later version. *
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9 * *
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10 * This program is distributed in the hope that it will be useful, *
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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13 * GNU General Public License for more details. *
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14 * *
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15 * You should have received a copy of the GNU General Public License *
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16 * along with this program; if not, write to the *
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17 * Free Software Foundation, Inc., *
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18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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19 ***************************************************************************/
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20
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21 #include "includes.h"
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2
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22 #include <fcntl.h>
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3
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23 #include <sys/socket.h>
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24 #include <netinet/in.h>
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25 #include <arpa/inet.h>
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26 #include <netdb.h>
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4
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27 #include <limits.h>
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1
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28
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4
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29 static char* syslogconfig_version = "$Id$";
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30 static char* iptables = "/sbin/iptables";
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1
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31
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3
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32 char *token_bucket;
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1
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33 char *token_file;
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3
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34 char *token_ignore;
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1
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35 char *token_include;
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3
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36 char *token_index;
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1
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37 char *token_lbrace;
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3
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38 char *token_pattern;
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1
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39 char *token_rbrace;
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40 char *token_semi;
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3
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41 char *token_slash;
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42 char *token_threshold;
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43
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44 struct ltint
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45 {
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46 bool operator()(const int s1, const int s2) const
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47 {
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48 return (unsigned)s1 < (unsigned)s2;
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49 }
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50 };
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1
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51
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4
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52 struct bucket {
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53 int count;
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54 bool latch; // true iff ever count>threshold
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55 };
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56
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1
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57 string_set all_strings; // owns all the strings, only modified by the config loader thread
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58 const int maxlen = 1000; // used for snprintf buffers
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4
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59 typedef map<int, bucket, ltint> ip_buckets;
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3
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60
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61 class IPR {
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62 ip_buckets violations;
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63 public:
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20
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64 void add(int ip, int amount, CONFIG &con, char *file_name, int pattern_index);
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3
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65 void leak(int amount, CONFIG &con);
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20
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66 void update(int ip, bool added, char *file_name, int pattern_index);
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67 void changed(CONFIG &con, int ip, bool added);
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3
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68 };
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69
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70 IPR recorder;
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71
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72
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73 ////////////////////////////////////////////////
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74 //
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20
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75 void IPR::add(int ip, int amount, CONFIG &con, char *file_name, int pattern_index) {
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3
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76 if (con.looking(ip)) {
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77 ip_buckets::iterator i = violations.find(ip);
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4
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78 if (i == violations.end()) {
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79 bucket b;
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80 b.count = amount;
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20
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81 b.latch = (con.get_threshold() <= b.count);
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4
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82 violations[ip] = b;
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20
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83 if (b.latch) {
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84 update(ip, true, file_name, pattern_index);
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85 changed(con, ip, true);
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86 }
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4
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87 }
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3
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88 else {
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4
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89 bucket &b = (*i).second;
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90 if (b.count < (INT_MAX-amount)) {
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91 int t = con.get_threshold();
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92 int c = b.count;
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93 b.count += amount;
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94 if ((!b.latch) && (c < t) && (t <= b.count)) {
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95 b.latch = true;
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20
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96 update(ip, true, file_name, pattern_index);
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97 changed(con, ip, true);
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4
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98 }
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99 }
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3
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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
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105 void IPR::leak(int amount, CONFIG &con) {
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106 for (ip_buckets::iterator i=violations.begin(); i!=violations.end(); ) {
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4
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107 int ip = (*i).first;
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108 bucket &b = (*i).second;
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109 if (b.count <= amount) {
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20
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110 if (b.latch) {
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111 update(ip, false, NULL, 0);
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24
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112 changed(con, ip, false);
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20
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113 }
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3
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114 violations.erase(i++);
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115 }
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116 else {
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4
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117 b.count -= amount;
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3
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118 i++;
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119 }
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120 }
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20
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121 }
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122
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123
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124 void IPR::update(int ip, bool added, char *file_name, int pattern_index) {
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125 if (debug_syslog > 2) {
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126 char buf[maxlen];
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127 in_addr ad;
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128 ad.s_addr = htonl(ip);
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129 if (added) snprintf(buf, maxlen, "dropping traffic from/to %s based on pattern match %d in %s", inet_ntoa(ad), pattern_index, file_name);
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130 else snprintf(buf, maxlen, "allowing traffic from/to %s", inet_ntoa(ad));
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131 my_syslog(buf);
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132 }
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3
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133 }
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134
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135
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20
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136 void IPR::changed(CONFIG &con, int ip, bool added) {
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137 int t = con.get_threshold();
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4
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138 char buf[maxlen];
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20
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139 if (added) {
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140 bucket &b = violations[ip];
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141 if (con.looking(ip) && (b.count > t)) {
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4
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142 in_addr ad;
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143 ad.s_addr = htonl(ip);
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144 snprintf(buf, maxlen, "count=%d %s -A INPUT --src %s --jump DROP", b.count, iptables, inet_ntoa(ad));
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5
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145 system(buf);
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4
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146 }
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3
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147 }
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20
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148 else {
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24
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149 in_addr ad;
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150 ad.s_addr = htonl(ip);
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151 snprintf(buf, maxlen, "%s -D INPUT --src %s --jump DROP", iptables, inet_ntoa(ad));
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20
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152 system(buf);
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153 }
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3
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154 }
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1
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155
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156
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3
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157 ////////////////////////////////////////////////
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158 //
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159 int ip_address(char *have);
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160 int ip_address(char *have) {
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161 int ipaddr = 0;
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162 in_addr ip;
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163 if (inet_aton(have, &ip)) ipaddr = ip.s_addr;
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164 else {
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165 struct hostent *host = gethostbyname(have);
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166 if (host && host->h_addrtype == AF_INET) memcpy(&ipaddr, host->h_addr, sizeof(ipaddr));
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167 }
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168 return ntohl(ipaddr);
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169 }
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170
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171
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172 ////////////////////////////////////////////////
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173 //
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4
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174 PATTERN::PATTERN(TOKEN &tok, char *pattern_, int index_, int amount_) {
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3
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175 pattern = pattern_;
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176 index = index_;
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4
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177 amount = amount_;
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3
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178 if (pattern) {
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179 int rc = regcomp(&re, pattern, REG_ICASE | REG_EXTENDED);
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180 if (rc) {
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181 char bu[maxlen];
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182 regerror(rc, &re, bu, maxlen);
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183 char buf[maxlen];
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184 snprintf(buf, sizeof(buf), "pattern %s not valid - %s", pattern, bu);
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185 tok.token_error(buf);
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186 pattern = NULL;
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187 }
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188 }
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189 }
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190
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191
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192 PATTERN::~PATTERN() {
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193 regfree(&re);
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194 }
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195
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196
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20
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197 bool PATTERN::process(char *buf, CONFIG &con, char *file_name, int pattern_index) {
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3
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198 if (pattern) {
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199 const int nmatch = index+1;
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200 regmatch_t match[nmatch];
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201 if (0 == regexec(&re, buf, nmatch, match, 0)) {
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202 int s = match[index].rm_so;
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203 int e = match[index].rm_eo;
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204 if (s != -1) {
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5
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205 if (debug_syslog > 3) {
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206 my_syslog(buf); // show lines with matches
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207 }
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3
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208 buf[e] = '\0';
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209 int ip = ip_address(buf+s);
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210 if (ip) {
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20
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211 recorder.add(ip, amount, con, file_name, pattern_index);
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3
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212 }
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213 return true;
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214 }
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215 }
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216 }
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217 return false;
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218 }
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219
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220
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221 void PATTERN::dump(int level) {
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222 char indent[maxlen];
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223 int i = min(maxlen-1, level*4);
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224 memset(indent, ' ', i);
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225 indent[i] = '\0';
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226 printf("%s pattern \"%s\" {; \n", indent, pattern);
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227 printf("%s index %d; \n", indent, index);
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4
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228 printf("%s bucket %d; \n", indent, amount);
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3
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229 printf("%s }; \n", indent);
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230 }
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231
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232
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233 ////////////////////////////////////////////////
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234 //
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1
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235 CONFIG::CONFIG() {
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236 reference_count = 0;
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237 generation = 0;
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238 load_time = 0;
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239 }
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240
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241
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242 CONFIG::~CONFIG() {
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243 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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244 SYSLOGCONFIG *c = *i;
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245 delete c;
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246 }
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3
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247 ignore.clear();
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1
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248 }
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249
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250
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251 void CONFIG::add_syslogconfig(SYSLOGCONFIGP con) {
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252 syslogconfigs.push_back(con);
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253 }
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254
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255
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3
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256 void CONFIG::add_pair(IPPAIR pair) {
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257 ignore.push_back(pair);
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258 }
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259
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260
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1
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261 void CONFIG::dump() {
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3
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262 printf(" threshold %d; \n\n", threshold);
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263
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264 printf(" ignore { \n");
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265 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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266 IPPAIR &p = *i;
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267 in_addr ip;
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268 ip.s_addr = htonl(p.first);
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269 printf(" %s/%d; \n", inet_ntoa(ip), p.cidr);
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270 }
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271 printf(" }; \n\n");
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272
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1
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273 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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274 SYSLOGCONFIGP c = *i;
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275 c->dump(0);
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276 }
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277 }
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278
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279
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2
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280 void CONFIG::read() {
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3
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281 while (true) {
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282 bool have = false;
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283 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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284 SYSLOGCONFIGP c = *i;
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285 have |= c->read(*this);
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286 }
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287 if (!have) break;
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2
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288 }
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289 }
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290
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291
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4
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292 void CONFIG::sleep(int duration, time_t &previous) {
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3
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293 ::sleep(duration);
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4
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294 time_t now = time(NULL);
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295 recorder.leak(now-previous, *this);
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296 previous = now;
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3
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297 }
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298
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299
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300 bool CONFIG::looking(int ip) {
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301 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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302 IPPAIR &p = *i;
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303 if ((p.first <= ip) && (ip <= p.last)) return false;
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304 }
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305 return true;
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306 }
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307
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308 ////////////////////////////////////////////////
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309 //
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310 SYSLOGCONFIG::SYSLOGCONFIG(TOKEN &tok, char *file_name_) {
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4
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311 tokp = &tok;
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2
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312 file_name = file_name_;
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4
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313 open(true);
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1
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314 }
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315
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316
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317 SYSLOGCONFIG::~SYSLOGCONFIG() {
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4
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318 close();
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3
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319 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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320 PATTERN *p = *i;
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321 delete p;
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322 }
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2
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323 }
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324
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325
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4
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326 void SYSLOGCONFIG::open(bool msg) {
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327 fd = ::open(file_name, O_RDONLY);
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328 len = 0;
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329 if (fd == -1) {
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330 if (msg) {
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331 char buf[maxlen];
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332 snprintf(buf, sizeof(buf), "syslog file %s not readable", file_name);
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333 tokp->token_error(buf);
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334 }
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335 }
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336 else {
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5
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337 if (debug_syslog > 1) {
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338 snprintf(buf, sizeof(buf), "syslog file %s opened", file_name);
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339 my_syslog(buf);
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340 }
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4
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341 lseek(fd, 0, SEEK_END);
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342 if (fstat(fd, &openfdstat)) {
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343 close();
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344 snprintf(buf, sizeof(buf), "syslog file %s cannot stat after open", file_name);
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345 tokp->token_error(buf);
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346 }
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347 }
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3
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348 }
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349
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350
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351 bool SYSLOGCONFIG::read(CONFIG &con) {
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4
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352 if (failed()) {
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353 open(false);
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354 if (failed()) return false;
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355 }
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3
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356 int n = ::read(fd, buf+len, buflen-len);
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357 bool have = (n > 0);
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358 if (have) {
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2
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359 len += n;
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360 while (true) {
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361 char *p = (char*)memchr(buf, '\n', len);
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362 if (!p) break;
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363 n = p-buf;
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364 *p = '\0';
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3
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365 process(con); // process null terminated string
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2
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366 len -= n+1;
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367 memmove(buf, p+1, len);
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368 }
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369 // no <lf> in a full buffer
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370 if (len == buflen) len = 0;
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371 }
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4
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372 else {
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373 // check for file close
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374 struct stat filenamest;
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375 if (0 == stat(file_name, &filenamest)) {
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376 if ((filenamest.st_dev != openfdstat.st_dev) ||
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377 (filenamest.st_ino != openfdstat.st_ino)) {
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378 close();
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379 }
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380 }
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381 else {
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382 // filename no longer exists
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383 close();
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384 }
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385 }
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3
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386 return have;
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2
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387 }
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388
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389
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4
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390 void SYSLOGCONFIG::close() {
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5
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391 if (debug_syslog > 1) {
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392 snprintf(buf, sizeof(buf), "syslog file %s closed", file_name);
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393 my_syslog(buf);
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394 }
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4
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395 if (fd != -1) ::close(fd);
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396 fd = -1;
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397 }
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398
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399
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400 void SYSLOGCONFIG::add_pattern(PATTERNP pat) {
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401 patterns.push_back(pat);
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402 }
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403
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404
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3
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405 void SYSLOGCONFIG::process(CONFIG &con) {
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20
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406 int pi=0;
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3
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407 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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408 PATTERN *p = *i;
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20
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409 if (p->process(buf, con, file_name, pi)) break;
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410 pi++;
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3
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411 }
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1
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412 }
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413
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414
|
|
|
415 void SYSLOGCONFIG::dump(int level) {
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|
416 char indent[maxlen];
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|
|
417 int i = min(maxlen-1, level*4);
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|
418 memset(indent, ' ', i);
|
|
|
419 indent[i] = '\0';
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|
|
420 char buf[maxlen];
|
|
|
421 printf("%s file \"%s\" {\n", indent, file_name);
|
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3
|
422 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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|
|
423 PATTERN *p = *i;
|
|
4
|
424 p->dump(level+1);
|
|
3
|
425 }
|
|
1
|
426 printf("%s }; \n", indent);
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|
|
427 }
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|
428
|
|
|
429
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|
|
430 ////////////////////////////////////////////////
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|
431 // helper to discard the strings held by a string_set
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|
432 //
|
|
|
433 void discard(string_set &s) {
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|
434 for (string_set::iterator i=s.begin(); i!=s.end(); i++) {
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435 free(*i);
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|
436 }
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|
|
437 s.clear();
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|
438 }
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|
439
|
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|
440
|
|
|
441 ////////////////////////////////////////////////
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|
442 // helper to register a string in a string set
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443 //
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|
444 char* register_string(string_set &s, char *name) {
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|
|
445 string_set::iterator i = s.find(name);
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|
|
446 if (i != s.end()) return *i;
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|
|
447 char *x = strdup(name);
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|
|
448 s.insert(x);
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|
449 return x;
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|
|
450 }
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|
451
|
|
|
452
|
|
|
453 ////////////////////////////////////////////////
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|
|
454 // register a global string
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|
|
455 //
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|
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456 char* register_string(char *name) {
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|
|
457 return register_string(all_strings, name);
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|
|
458 }
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|
|
459
|
|
|
460
|
|
|
461 ////////////////////////////////////////////////
|
|
|
462 //
|
|
|
463 bool tsa(TOKEN &tok, char *token);
|
|
|
464 bool tsa(TOKEN &tok, char *token) {
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|
|
465 char *have = tok.next();
|
|
|
466 if (have == token) return true;
|
|
|
467 tok.token_error(token, have);
|
|
|
468 return false;
|
|
|
469 }
|
|
|
470
|
|
|
471
|
|
|
472 ////////////////////////////////////////////////
|
|
|
473 //
|
|
3
|
474 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con);
|
|
|
475 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con) {
|
|
|
476 char *pat = tok.next();
|
|
|
477 int ind, buc;
|
|
1
|
478 if (!tsa(tok, token_lbrace)) return false;
|
|
|
479 while (true) {
|
|
|
480 char *have = tok.next();
|
|
3
|
481 if (!have) break;
|
|
|
482 if (have == token_rbrace) break;
|
|
|
483 if (have == token_index) {
|
|
1
|
484 have = tok.next();
|
|
3
|
485 ind = atoi(have);
|
|
1
|
486 if (!tsa(tok, token_semi)) return false;
|
|
|
487 }
|
|
3
|
488 else if (have == token_bucket) {
|
|
|
489 have = tok.next();
|
|
|
490 buc = atoi(have);
|
|
|
491 if (!tsa(tok, token_semi)) return false;
|
|
1
|
492 }
|
|
|
493 else {
|
|
3
|
494 tok.token_error("index/bucket", have);
|
|
1
|
495 return false;
|
|
|
496 }
|
|
|
497 }
|
|
|
498 if (!tsa(tok, token_semi)) return false;
|
|
3
|
499 PATTERNP patt = new PATTERN(tok, pat, ind, buc);
|
|
|
500 con.add_pattern(patt);
|
|
|
501 return true;
|
|
|
502 }
|
|
|
503
|
|
|
504
|
|
|
505 ////////////////////////////////////////////////
|
|
|
506 //
|
|
|
507 bool parse_ignore(TOKEN &tok, CONFIG &dc);
|
|
|
508 bool parse_ignore(TOKEN &tok, CONFIG &dc) {
|
|
|
509 if (!tsa(tok, token_lbrace)) return false;
|
|
|
510 while (true) {
|
|
|
511 char *have = tok.next();
|
|
|
512 if (!have) break;
|
|
|
513 if (have == token_rbrace) break;
|
|
|
514 int ipaddr = ip_address(have);
|
|
|
515 if (ipaddr == 0) {
|
|
|
516 tok.token_error("ip address", have);
|
|
|
517 return false;
|
|
|
518 }
|
|
|
519 if (!tsa(tok, token_slash)) return false;
|
|
|
520 have = tok.next();
|
|
|
521 int mask = atoi(have);
|
|
|
522 if ((mask < 8) || (mask > 32)) {
|
|
|
523 tok.token_error("cidr 8..32 value", have);
|
|
|
524 return false;
|
|
|
525 }
|
|
|
526 if (!tsa(tok, token_semi)) return false;
|
|
|
527 IPPAIR pair;
|
|
|
528 const int masks[33] = {0xffffffff, // 0
|
|
|
529 0x7fffffff, // 1
|
|
|
530 0x3fffffff, // 2
|
|
|
531 0x1fffffff, // 3
|
|
|
532 0x0fffffff, // 4
|
|
|
533 0x07ffffff, // 5
|
|
|
534 0x03ffffff, // 6
|
|
|
535 0x01ffffff, // 7
|
|
|
536 0x00ffffff, // 8
|
|
|
537 0x007fffff, // 9
|
|
|
538 0x003fffff, // 10
|
|
|
539 0x001fffff, // 11
|
|
|
540 0x000fffff, // 12
|
|
|
541 0x0007ffff, // 13
|
|
|
542 0x0003ffff, // 14
|
|
|
543 0x0001ffff, // 15
|
|
|
544 0x0000ffff, // 16
|
|
|
545 0x00007fff, // 17
|
|
|
546 0x00003fff, // 18
|
|
|
547 0x00001fff, // 19
|
|
|
548 0x00000fff, // 20
|
|
|
549 0x000007ff, // 21
|
|
|
550 0x000003ff, // 22
|
|
|
551 0x000001ff, // 23
|
|
|
552 0x000000ff, // 24
|
|
|
553 0x0000007f, // 25
|
|
|
554 0x0000003f, // 26
|
|
|
555 0x0000001f, // 27
|
|
|
556 0x0000000f, // 28
|
|
|
557 0x00000007, // 29
|
|
|
558 0x00000003, // 30
|
|
|
559 0x00000001, // 31
|
|
|
560 0x00000000}; // 32
|
|
|
561 pair.first = ipaddr;
|
|
|
562 pair.last = ipaddr | masks[mask];
|
|
|
563 pair.cidr = mask;
|
|
|
564 dc.add_pair(pair);
|
|
|
565 }
|
|
|
566 if (!tsa(tok, token_semi)) return false;
|
|
|
567 return true;
|
|
|
568 }
|
|
|
569
|
|
|
570
|
|
|
571 ////////////////////////////////////////////////
|
|
|
572 //
|
|
|
573 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc);
|
|
|
574 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc) {
|
|
|
575 char *name = tok.next();
|
|
|
576 if (!tsa(tok, token_lbrace)) return false;
|
|
|
577 SYSLOGCONFIGP con = new SYSLOGCONFIG(tok, name);
|
|
2
|
578 if (con->failed()) {
|
|
|
579 delete con;
|
|
|
580 return false;
|
|
|
581 }
|
|
1
|
582 dc.add_syslogconfig(con);
|
|
3
|
583 while (true) {
|
|
|
584 char *have = tok.next();
|
|
|
585 if (!have) break;
|
|
|
586 if (have == token_rbrace) break;
|
|
|
587 if (have == token_pattern) {
|
|
|
588 if (!parse_pattern(tok, *con)) return false;
|
|
|
589 }
|
|
|
590 else {
|
|
|
591 tok.token_error("pattern", have);
|
|
|
592 return false;
|
|
|
593 }
|
|
|
594 }
|
|
|
595 if (!tsa(tok, token_semi)) return false;
|
|
1
|
596 return true;
|
|
|
597 }
|
|
|
598
|
|
|
599
|
|
|
600 ////////////////////////////////////////////////
|
|
|
601 // parse a config file
|
|
|
602 //
|
|
|
603 bool load_conf(CONFIG &dc, char *fn) {
|
|
|
604 int count = 0;
|
|
|
605 TOKEN tok(fn, &dc.config_files);
|
|
|
606 while (true) {
|
|
|
607 char *have = tok.next();
|
|
|
608 if (!have) break;
|
|
3
|
609 if (have == token_threshold) {
|
|
|
610 have = tok.next();
|
|
|
611 dc.set_threshold(atoi(have));
|
|
|
612 if (!tsa(tok, token_semi)) return false;
|
|
|
613 }
|
|
|
614 else if (have == token_ignore) {
|
|
|
615 if (!parse_ignore(tok, dc)) return false;
|
|
|
616 }
|
|
|
617 else if (have == token_file) {
|
|
|
618 if (!parse_syslogconfig(tok, dc)) return false;
|
|
|
619 count++;
|
|
1
|
620 }
|
|
|
621 else {
|
|
3
|
622 tok.token_error("threshold/ignore/file", have);
|
|
1
|
623 return false;
|
|
|
624 }
|
|
|
625 }
|
|
|
626 tok.token_error("load_conf() found %d syslog files in %s", count, fn);
|
|
|
627 return (!dc.syslogconfigs.empty());
|
|
|
628 }
|
|
|
629
|
|
|
630
|
|
|
631 ////////////////////////////////////////////////
|
|
|
632 // init the tokens
|
|
|
633 //
|
|
|
634 void token_init() {
|
|
3
|
635 token_bucket = register_string("bucket");
|
|
1
|
636 token_file = register_string("file");
|
|
3
|
637 token_ignore = register_string("ignore");
|
|
1
|
638 token_include = register_string("include");
|
|
3
|
639 token_index = register_string("index");
|
|
1
|
640 token_lbrace = register_string("{");
|
|
3
|
641 token_pattern = register_string("pattern");
|
|
1
|
642 token_rbrace = register_string("}");
|
|
|
643 token_semi = register_string(";");
|
|
3
|
644 token_slash = register_string("/");
|
|
|
645 token_threshold = register_string("threshold");
|
|
1
|
646 }
|
