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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 bool ch = false;
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107 for (ip_buckets::iterator i=violations.begin(); i!=violations.end(); ) {
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4
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108 int ip = (*i).first;
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109 bucket &b = (*i).second;
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110 if (b.count <= amount) {
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20
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111 if (b.latch) {
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112 update(ip, false, NULL, 0);
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113 ch = true;
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114 }
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3
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115 violations.erase(i++);
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116 }
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117 else {
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4
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118 b.count -= amount;
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3
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119 i++;
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120 }
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121 }
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20
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122 if (ch) changed(con, 0, false);
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123 }
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124
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125
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126 void IPR::update(int ip, bool added, char *file_name, int pattern_index) {
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127 if (debug_syslog > 2) {
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128 char buf[maxlen];
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129 in_addr ad;
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130 ad.s_addr = htonl(ip);
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131 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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132 else snprintf(buf, maxlen, "allowing traffic from/to %s", inet_ntoa(ad));
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133 my_syslog(buf);
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134 }
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3
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135 }
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136
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137
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20
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138 void IPR::changed(CONFIG &con, int ip, bool added) {
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139 int t = con.get_threshold();
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4
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140 char buf[maxlen];
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20
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141 if (added) {
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142 bucket &b = violations[ip];
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143 if (con.looking(ip) && (b.count > t)) {
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4
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144 in_addr ad;
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145 ad.s_addr = htonl(ip);
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146 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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147 system(buf);
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4
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148 }
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3
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149 }
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20
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150 else {
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151 // releasing some ip, redo the table
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152 snprintf(buf, maxlen, "%s -F INPUT", iptables);
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153 system(buf);
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154 for (ip_buckets::iterator i=violations.begin(); i!=violations.end(); i++) {
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155 int ip = (*i).first;
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156 bucket &b = (*i).second;
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157 if (con.looking(ip) && (b.count > t)) {
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158 in_addr ad;
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159 ad.s_addr = htonl(ip);
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160 snprintf(buf, maxlen, "count=%d %s -A INPUT --src %s --jump DROP", b.count, iptables, inet_ntoa(ad));
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161 system(buf);
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162 }
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163 }
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164 }
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3
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165 }
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1
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166
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167
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3
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168 ////////////////////////////////////////////////
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169 //
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170 int ip_address(char *have);
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171 int ip_address(char *have) {
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172 int ipaddr = 0;
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173 in_addr ip;
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174 if (inet_aton(have, &ip)) ipaddr = ip.s_addr;
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175 else {
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176 struct hostent *host = gethostbyname(have);
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177 if (host && host->h_addrtype == AF_INET) memcpy(&ipaddr, host->h_addr, sizeof(ipaddr));
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178 }
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179 return ntohl(ipaddr);
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180 }
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181
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182
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183 ////////////////////////////////////////////////
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184 //
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4
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185 PATTERN::PATTERN(TOKEN &tok, char *pattern_, int index_, int amount_) {
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3
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186 pattern = pattern_;
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187 index = index_;
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4
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188 amount = amount_;
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3
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189 if (pattern) {
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190 int rc = regcomp(&re, pattern, REG_ICASE | REG_EXTENDED);
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191 if (rc) {
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192 char bu[maxlen];
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193 regerror(rc, &re, bu, maxlen);
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194 char buf[maxlen];
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195 snprintf(buf, sizeof(buf), "pattern %s not valid - %s", pattern, bu);
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196 tok.token_error(buf);
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197 pattern = NULL;
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198 }
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199 }
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200 }
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201
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202
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203 PATTERN::~PATTERN() {
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204 regfree(&re);
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205 }
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206
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207
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20
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208 bool PATTERN::process(char *buf, CONFIG &con, char *file_name, int pattern_index) {
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3
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209 if (pattern) {
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210 const int nmatch = index+1;
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211 regmatch_t match[nmatch];
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212 if (0 == regexec(&re, buf, nmatch, match, 0)) {
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213 int s = match[index].rm_so;
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214 int e = match[index].rm_eo;
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215 if (s != -1) {
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5
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216 if (debug_syslog > 3) {
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217 my_syslog(buf); // show lines with matches
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218 }
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3
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219 buf[e] = '\0';
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220 int ip = ip_address(buf+s);
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221 if (ip) {
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20
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222 recorder.add(ip, amount, con, file_name, pattern_index);
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3
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223 }
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224 return true;
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225 }
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226 }
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227 }
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228 return false;
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229 }
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230
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231
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232 void PATTERN::dump(int level) {
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233 char indent[maxlen];
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234 int i = min(maxlen-1, level*4);
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235 memset(indent, ' ', i);
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236 indent[i] = '\0';
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237 printf("%s pattern \"%s\" {; \n", indent, pattern);
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238 printf("%s index %d; \n", indent, index);
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4
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239 printf("%s bucket %d; \n", indent, amount);
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3
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240 printf("%s }; \n", indent);
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241 }
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242
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243
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244 ////////////////////////////////////////////////
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245 //
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1
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246 CONFIG::CONFIG() {
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247 reference_count = 0;
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248 generation = 0;
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249 load_time = 0;
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250 }
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251
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252
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253 CONFIG::~CONFIG() {
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254 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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255 SYSLOGCONFIG *c = *i;
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256 delete c;
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257 }
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3
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258 ignore.clear();
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1
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259 }
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260
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261
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262 void CONFIG::add_syslogconfig(SYSLOGCONFIGP con) {
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263 syslogconfigs.push_back(con);
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264 }
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265
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266
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3
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267 void CONFIG::add_pair(IPPAIR pair) {
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268 ignore.push_back(pair);
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269 }
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270
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271
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1
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272 void CONFIG::dump() {
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3
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273 printf(" threshold %d; \n\n", threshold);
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274
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275 printf(" ignore { \n");
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276 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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277 IPPAIR &p = *i;
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278 in_addr ip;
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279 ip.s_addr = htonl(p.first);
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280 printf(" %s/%d; \n", inet_ntoa(ip), p.cidr);
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281 }
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282 printf(" }; \n\n");
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283
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1
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284 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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285 SYSLOGCONFIGP c = *i;
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286 c->dump(0);
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287 }
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288 }
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289
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290
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2
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291 void CONFIG::read() {
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3
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292 while (true) {
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293 bool have = false;
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294 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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295 SYSLOGCONFIGP c = *i;
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296 have |= c->read(*this);
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297 }
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298 if (!have) break;
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2
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299 }
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300 }
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301
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302
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4
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303 void CONFIG::sleep(int duration, time_t &previous) {
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3
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304 ::sleep(duration);
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4
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305 time_t now = time(NULL);
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306 recorder.leak(now-previous, *this);
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307 previous = now;
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3
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308 }
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309
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310
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311 bool CONFIG::looking(int ip) {
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312 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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313 IPPAIR &p = *i;
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314 if ((p.first <= ip) && (ip <= p.last)) return false;
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315 }
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316 return true;
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317 }
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318
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319 ////////////////////////////////////////////////
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320 //
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321 SYSLOGCONFIG::SYSLOGCONFIG(TOKEN &tok, char *file_name_) {
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4
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322 tokp = &tok;
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2
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323 file_name = file_name_;
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4
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324 open(true);
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1
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325 }
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326
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327
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328 SYSLOGCONFIG::~SYSLOGCONFIG() {
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4
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329 close();
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3
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330 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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331 PATTERN *p = *i;
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332 delete p;
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333 }
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2
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334 }
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335
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336
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4
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337 void SYSLOGCONFIG::open(bool msg) {
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338 fd = ::open(file_name, O_RDONLY);
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339 len = 0;
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340 if (fd == -1) {
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341 if (msg) {
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342 char buf[maxlen];
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343 snprintf(buf, sizeof(buf), "syslog file %s not readable", file_name);
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344 tokp->token_error(buf);
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345 }
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346 }
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347 else {
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5
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348 if (debug_syslog > 1) {
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349 snprintf(buf, sizeof(buf), "syslog file %s opened", file_name);
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350 my_syslog(buf);
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351 }
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4
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352 lseek(fd, 0, SEEK_END);
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353 if (fstat(fd, &openfdstat)) {
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354 close();
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355 snprintf(buf, sizeof(buf), "syslog file %s cannot stat after open", file_name);
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356 tokp->token_error(buf);
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357 }
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358 }
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3
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359 }
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360
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361
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362 bool SYSLOGCONFIG::read(CONFIG &con) {
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4
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363 if (failed()) {
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364 open(false);
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365 if (failed()) return false;
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366 }
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3
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367 int n = ::read(fd, buf+len, buflen-len);
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368 bool have = (n > 0);
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369 if (have) {
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2
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370 len += n;
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371 while (true) {
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372 char *p = (char*)memchr(buf, '\n', len);
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373 if (!p) break;
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374 n = p-buf;
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375 *p = '\0';
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3
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376 process(con); // process null terminated string
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2
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377 len -= n+1;
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378 memmove(buf, p+1, len);
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379 }
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380 // no <lf> in a full buffer
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381 if (len == buflen) len = 0;
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382 }
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4
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383 else {
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384 // check for file close
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385 struct stat filenamest;
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386 if (0 == stat(file_name, &filenamest)) {
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387 if ((filenamest.st_dev != openfdstat.st_dev) ||
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388 (filenamest.st_ino != openfdstat.st_ino)) {
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389 close();
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390 }
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391 }
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392 else {
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393 // filename no longer exists
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394 close();
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395 }
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396 }
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3
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397 return have;
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2
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398 }
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399
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400
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4
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401 void SYSLOGCONFIG::close() {
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5
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402 if (debug_syslog > 1) {
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403 snprintf(buf, sizeof(buf), "syslog file %s closed", file_name);
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404 my_syslog(buf);
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405 }
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4
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406 if (fd != -1) ::close(fd);
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407 fd = -1;
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408 }
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409
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410
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411 void SYSLOGCONFIG::add_pattern(PATTERNP pat) {
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|
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412 patterns.push_back(pat);
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413 }
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414
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415
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3
|
416 void SYSLOGCONFIG::process(CONFIG &con) {
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20
|
417 int pi=0;
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3
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418 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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|
419 PATTERN *p = *i;
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20
|
420 if (p->process(buf, con, file_name, pi)) break;
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421 pi++;
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3
|
422 }
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1
|
423 }
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424
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425
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|
|
426 void SYSLOGCONFIG::dump(int level) {
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427 char indent[maxlen];
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428 int i = min(maxlen-1, level*4);
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429 memset(indent, ' ', i);
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430 indent[i] = '\0';
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|
431 char buf[maxlen];
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|
432 printf("%s file \"%s\" {\n", indent, file_name);
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3
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433 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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434 PATTERN *p = *i;
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4
|
435 p->dump(level+1);
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3
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436 }
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1
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437 printf("%s }; \n", indent);
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438 }
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439
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440
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441 ////////////////////////////////////////////////
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442 // helper to discard the strings held by a string_set
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443 //
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444 void discard(string_set &s) {
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445 for (string_set::iterator i=s.begin(); i!=s.end(); i++) {
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446 free(*i);
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447 }
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448 s.clear();
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449 }
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450
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451
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|
452 ////////////////////////////////////////////////
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453 // helper to register a string in a string set
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454 //
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455 char* register_string(string_set &s, char *name) {
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456 string_set::iterator i = s.find(name);
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457 if (i != s.end()) return *i;
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458 char *x = strdup(name);
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459 s.insert(x);
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460 return x;
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461 }
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462
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463
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464 ////////////////////////////////////////////////
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465 // register a global string
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466 //
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467 char* register_string(char *name) {
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468 return register_string(all_strings, name);
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469 }
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470
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471
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|
472 ////////////////////////////////////////////////
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|
473 //
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|
474 bool tsa(TOKEN &tok, char *token);
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475 bool tsa(TOKEN &tok, char *token) {
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476 char *have = tok.next();
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|
477 if (have == token) return true;
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|
|
478 tok.token_error(token, have);
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|
479 return false;
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|
480 }
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|
|
481
|
|
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482
|
|
|
483 ////////////////////////////////////////////////
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|
|
484 //
|
|
3
|
485 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con);
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|
|
486 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con) {
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|
|
487 char *pat = tok.next();
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|
|
488 int ind, buc;
|
|
1
|
489 if (!tsa(tok, token_lbrace)) return false;
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|
|
490 while (true) {
|
|
|
491 char *have = tok.next();
|
|
3
|
492 if (!have) break;
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|
|
493 if (have == token_rbrace) break;
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|
|
494 if (have == token_index) {
|
|
1
|
495 have = tok.next();
|
|
3
|
496 ind = atoi(have);
|
|
1
|
497 if (!tsa(tok, token_semi)) return false;
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|
|
498 }
|
|
3
|
499 else if (have == token_bucket) {
|
|
|
500 have = tok.next();
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|
|
501 buc = atoi(have);
|
|
|
502 if (!tsa(tok, token_semi)) return false;
|
|
1
|
503 }
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|
|
504 else {
|
|
3
|
505 tok.token_error("index/bucket", have);
|
|
1
|
506 return false;
|
|
|
507 }
|
|
|
508 }
|
|
|
509 if (!tsa(tok, token_semi)) return false;
|
|
3
|
510 PATTERNP patt = new PATTERN(tok, pat, ind, buc);
|
|
|
511 con.add_pattern(patt);
|
|
|
512 return true;
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|
|
513 }
|
|
|
514
|
|
|
515
|
|
|
516 ////////////////////////////////////////////////
|
|
|
517 //
|
|
|
518 bool parse_ignore(TOKEN &tok, CONFIG &dc);
|
|
|
519 bool parse_ignore(TOKEN &tok, CONFIG &dc) {
|
|
|
520 if (!tsa(tok, token_lbrace)) return false;
|
|
|
521 while (true) {
|
|
|
522 char *have = tok.next();
|
|
|
523 if (!have) break;
|
|
|
524 if (have == token_rbrace) break;
|
|
|
525 int ipaddr = ip_address(have);
|
|
|
526 if (ipaddr == 0) {
|
|
|
527 tok.token_error("ip address", have);
|
|
|
528 return false;
|
|
|
529 }
|
|
|
530 if (!tsa(tok, token_slash)) return false;
|
|
|
531 have = tok.next();
|
|
|
532 int mask = atoi(have);
|
|
|
533 if ((mask < 8) || (mask > 32)) {
|
|
|
534 tok.token_error("cidr 8..32 value", have);
|
|
|
535 return false;
|
|
|
536 }
|
|
|
537 if (!tsa(tok, token_semi)) return false;
|
|
|
538 IPPAIR pair;
|
|
|
539 const int masks[33] = {0xffffffff, // 0
|
|
|
540 0x7fffffff, // 1
|
|
|
541 0x3fffffff, // 2
|
|
|
542 0x1fffffff, // 3
|
|
|
543 0x0fffffff, // 4
|
|
|
544 0x07ffffff, // 5
|
|
|
545 0x03ffffff, // 6
|
|
|
546 0x01ffffff, // 7
|
|
|
547 0x00ffffff, // 8
|
|
|
548 0x007fffff, // 9
|
|
|
549 0x003fffff, // 10
|
|
|
550 0x001fffff, // 11
|
|
|
551 0x000fffff, // 12
|
|
|
552 0x0007ffff, // 13
|
|
|
553 0x0003ffff, // 14
|
|
|
554 0x0001ffff, // 15
|
|
|
555 0x0000ffff, // 16
|
|
|
556 0x00007fff, // 17
|
|
|
557 0x00003fff, // 18
|
|
|
558 0x00001fff, // 19
|
|
|
559 0x00000fff, // 20
|
|
|
560 0x000007ff, // 21
|
|
|
561 0x000003ff, // 22
|
|
|
562 0x000001ff, // 23
|
|
|
563 0x000000ff, // 24
|
|
|
564 0x0000007f, // 25
|
|
|
565 0x0000003f, // 26
|
|
|
566 0x0000001f, // 27
|
|
|
567 0x0000000f, // 28
|
|
|
568 0x00000007, // 29
|
|
|
569 0x00000003, // 30
|
|
|
570 0x00000001, // 31
|
|
|
571 0x00000000}; // 32
|
|
|
572 pair.first = ipaddr;
|
|
|
573 pair.last = ipaddr | masks[mask];
|
|
|
574 pair.cidr = mask;
|
|
|
575 dc.add_pair(pair);
|
|
|
576 }
|
|
|
577 if (!tsa(tok, token_semi)) return false;
|
|
|
578 return true;
|
|
|
579 }
|
|
|
580
|
|
|
581
|
|
|
582 ////////////////////////////////////////////////
|
|
|
583 //
|
|
|
584 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc);
|
|
|
585 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc) {
|
|
|
586 char *name = tok.next();
|
|
|
587 if (!tsa(tok, token_lbrace)) return false;
|
|
|
588 SYSLOGCONFIGP con = new SYSLOGCONFIG(tok, name);
|
|
2
|
589 if (con->failed()) {
|
|
|
590 delete con;
|
|
|
591 return false;
|
|
|
592 }
|
|
1
|
593 dc.add_syslogconfig(con);
|
|
3
|
594 while (true) {
|
|
|
595 char *have = tok.next();
|
|
|
596 if (!have) break;
|
|
|
597 if (have == token_rbrace) break;
|
|
|
598 if (have == token_pattern) {
|
|
|
599 if (!parse_pattern(tok, *con)) return false;
|
|
|
600 }
|
|
|
601 else {
|
|
|
602 tok.token_error("pattern", have);
|
|
|
603 return false;
|
|
|
604 }
|
|
|
605 }
|
|
|
606 if (!tsa(tok, token_semi)) return false;
|
|
1
|
607 return true;
|
|
|
608 }
|
|
|
609
|
|
|
610
|
|
|
611 ////////////////////////////////////////////////
|
|
|
612 // parse a config file
|
|
|
613 //
|
|
|
614 bool load_conf(CONFIG &dc, char *fn) {
|
|
|
615 int count = 0;
|
|
|
616 TOKEN tok(fn, &dc.config_files);
|
|
|
617 while (true) {
|
|
|
618 char *have = tok.next();
|
|
|
619 if (!have) break;
|
|
3
|
620 if (have == token_threshold) {
|
|
|
621 have = tok.next();
|
|
|
622 dc.set_threshold(atoi(have));
|
|
|
623 if (!tsa(tok, token_semi)) return false;
|
|
|
624 }
|
|
|
625 else if (have == token_ignore) {
|
|
|
626 if (!parse_ignore(tok, dc)) return false;
|
|
|
627 }
|
|
|
628 else if (have == token_file) {
|
|
|
629 if (!parse_syslogconfig(tok, dc)) return false;
|
|
|
630 count++;
|
|
1
|
631 }
|
|
|
632 else {
|
|
3
|
633 tok.token_error("threshold/ignore/file", have);
|
|
1
|
634 return false;
|
|
|
635 }
|
|
|
636 }
|
|
|
637 tok.token_error("load_conf() found %d syslog files in %s", count, fn);
|
|
|
638 return (!dc.syslogconfigs.empty());
|
|
|
639 }
|
|
|
640
|
|
|
641
|
|
|
642 ////////////////////////////////////////////////
|
|
|
643 // init the tokens
|
|
|
644 //
|
|
|
645 void token_init() {
|
|
3
|
646 token_bucket = register_string("bucket");
|
|
1
|
647 token_file = register_string("file");
|
|
3
|
648 token_ignore = register_string("ignore");
|
|
1
|
649 token_include = register_string("include");
|
|
3
|
650 token_index = register_string("index");
|
|
1
|
651 token_lbrace = register_string("{");
|
|
3
|
652 token_pattern = register_string("pattern");
|
|
1
|
653 token_rbrace = register_string("}");
|
|
|
654 token_semi = register_string(";");
|
|
3
|
655 token_slash = register_string("/");
|
|
|
656 token_threshold = register_string("threshold");
|
|
1
|
657 }
|
