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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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1
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30
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27
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31 char *token_add;
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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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27
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40 char *token_remove;
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1
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41 char *token_semi;
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3
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42 char *token_slash;
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43 char *token_threshold;
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44
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45 struct ltint
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46 {
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47 bool operator()(const int s1, const int s2) const
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48 {
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49 return (unsigned)s1 < (unsigned)s2;
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50 }
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51 };
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1
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52
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4
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53 struct bucket {
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54 int count;
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55 bool latch; // true iff ever count>threshold
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56 };
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57
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1
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58 string_set all_strings; // owns all the strings, only modified by the config loader thread
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59 const int maxlen = 1000; // used for snprintf buffers
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4
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60 typedef map<int, bucket, ltint> ip_buckets;
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3
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61
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62 class IPR {
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63 ip_buckets violations;
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64 public:
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20
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65 void add(int ip, int amount, CONFIG &con, char *file_name, int pattern_index);
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3
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66 void leak(int amount, CONFIG &con);
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20
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67 void update(int ip, bool added, char *file_name, int pattern_index);
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68 void changed(CONFIG &con, int ip, bool added);
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3
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69 };
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70
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71 IPR recorder;
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72
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73
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74 ////////////////////////////////////////////////
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75 //
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20
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76 void IPR::add(int ip, int amount, CONFIG &con, char *file_name, int pattern_index) {
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3
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77 if (con.looking(ip)) {
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78 ip_buckets::iterator i = violations.find(ip);
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4
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79 if (i == violations.end()) {
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80 bucket b;
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81 b.count = amount;
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20
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82 b.latch = (con.get_threshold() <= b.count);
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4
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83 violations[ip] = b;
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20
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84 if (b.latch) {
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85 update(ip, true, file_name, pattern_index);
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86 changed(con, ip, true);
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87 }
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4
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88 }
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3
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89 else {
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4
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90 bucket &b = (*i).second;
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91 if (b.count < (INT_MAX-amount)) {
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92 int t = con.get_threshold();
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93 int c = b.count;
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94 b.count += amount;
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95 if ((!b.latch) && (c < t) && (t <= b.count)) {
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96 b.latch = true;
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20
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97 update(ip, true, file_name, pattern_index);
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98 changed(con, ip, true);
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4
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99 }
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100 }
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3
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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
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106 void IPR::leak(int amount, CONFIG &con) {
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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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24
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113 changed(con, ip, false);
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20
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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 }
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123
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124
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125 void IPR::update(int ip, bool added, char *file_name, int pattern_index) {
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126 if (debug_syslog > 2) {
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127 char buf[maxlen];
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128 in_addr ad;
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129 ad.s_addr = htonl(ip);
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130 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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131 else snprintf(buf, maxlen, "allowing traffic from/to %s", inet_ntoa(ad));
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132 my_syslog(buf);
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133 }
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3
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134 }
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135
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136
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20
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137 void IPR::changed(CONFIG &con, int ip, bool added) {
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138 int t = con.get_threshold();
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4
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139 char buf[maxlen];
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20
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140 if (added) {
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141 bucket &b = violations[ip];
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142 if (con.looking(ip) && (b.count > t)) {
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4
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143 in_addr ad;
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144 ad.s_addr = htonl(ip);
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27
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145 snprintf(buf, maxlen, con.add_command, inet_ntoa(ad));
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5
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146 system(buf);
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4
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147 }
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3
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148 }
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20
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149 else {
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24
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150 in_addr ad;
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151 ad.s_addr = htonl(ip);
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27
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152 snprintf(buf, maxlen, con.remove_command, inet_ntoa(ad));
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20
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153 system(buf);
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154 }
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3
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155 }
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1
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156
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157
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3
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158 ////////////////////////////////////////////////
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159 //
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160 int ip_address(char *have);
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161 int ip_address(char *have) {
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162 int ipaddr = 0;
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163 in_addr ip;
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164 if (inet_aton(have, &ip)) ipaddr = ip.s_addr;
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165 else {
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166 struct hostent *host = gethostbyname(have);
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167 if (host && host->h_addrtype == AF_INET) memcpy(&ipaddr, host->h_addr, sizeof(ipaddr));
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168 }
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169 return ntohl(ipaddr);
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170 }
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171
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172
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173 ////////////////////////////////////////////////
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174 //
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4
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175 PATTERN::PATTERN(TOKEN &tok, char *pattern_, int index_, int amount_) {
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3
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176 pattern = pattern_;
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177 index = index_;
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4
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178 amount = amount_;
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3
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179 if (pattern) {
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180 int rc = regcomp(&re, pattern, REG_ICASE | REG_EXTENDED);
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181 if (rc) {
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182 char bu[maxlen];
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183 regerror(rc, &re, bu, maxlen);
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184 char buf[maxlen];
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185 snprintf(buf, sizeof(buf), "pattern %s not valid - %s", pattern, bu);
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186 tok.token_error(buf);
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187 pattern = NULL;
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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
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193 PATTERN::~PATTERN() {
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194 regfree(&re);
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195 }
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196
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197
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20
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198 bool PATTERN::process(char *buf, CONFIG &con, char *file_name, int pattern_index) {
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3
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199 if (pattern) {
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200 const int nmatch = index+1;
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201 regmatch_t match[nmatch];
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202 if (0 == regexec(&re, buf, nmatch, match, 0)) {
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203 int s = match[index].rm_so;
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204 int e = match[index].rm_eo;
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205 if (s != -1) {
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5
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206 if (debug_syslog > 3) {
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207 my_syslog(buf); // show lines with matches
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208 }
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3
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209 buf[e] = '\0';
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210 int ip = ip_address(buf+s);
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211 if (ip) {
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20
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212 recorder.add(ip, amount, con, file_name, pattern_index);
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3
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213 }
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214 return true;
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215 }
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216 }
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217 }
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218 return false;
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219 }
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220
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221
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222 void PATTERN::dump(int level) {
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223 char indent[maxlen];
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224 int i = min(maxlen-1, level*4);
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225 memset(indent, ' ', i);
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226 indent[i] = '\0';
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227 printf("%s pattern \"%s\" {; \n", indent, pattern);
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228 printf("%s index %d; \n", indent, index);
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4
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229 printf("%s bucket %d; \n", indent, amount);
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3
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230 printf("%s }; \n", indent);
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231 }
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232
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233
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234 ////////////////////////////////////////////////
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235 //
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1
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236 CONFIG::CONFIG() {
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237 reference_count = 0;
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238 generation = 0;
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239 load_time = 0;
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27
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240 threshold = 500;
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241 add_command = "/sbin/iptables -I INPUT --src %s --jump DROP";
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242 remove_command = "/sbin/iptables -D INPUT --src %s --jump DROP";
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1
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243 }
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244
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245
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246 CONFIG::~CONFIG() {
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247 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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248 SYSLOGCONFIG *c = *i;
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249 delete c;
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250 }
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3
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251 ignore.clear();
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1
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252 }
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253
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254
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255 void CONFIG::add_syslogconfig(SYSLOGCONFIGP con) {
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256 syslogconfigs.push_back(con);
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257 }
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258
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259
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3
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260 void CONFIG::add_pair(IPPAIR pair) {
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261 ignore.push_back(pair);
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262 }
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263
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264
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1
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265 void CONFIG::dump() {
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3
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266 printf(" threshold %d; \n\n", threshold);
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267
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27
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268 printf(" add_command \"%s\"; \n", add_command);
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269 printf(" remove_command \"%s\"; \n\n", remove_command);
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270
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3
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271 printf(" ignore { \n");
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272 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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273 IPPAIR &p = *i;
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274 in_addr ip;
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275 ip.s_addr = htonl(p.first);
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276 printf(" %s/%d; \n", inet_ntoa(ip), p.cidr);
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277 }
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278 printf(" }; \n\n");
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279
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1
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280 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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281 SYSLOGCONFIGP c = *i;
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282 c->dump(0);
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283 }
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284 }
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285
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286
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2
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287 void CONFIG::read() {
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3
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288 while (true) {
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289 bool have = false;
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290 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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291 SYSLOGCONFIGP c = *i;
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292 have |= c->read(*this);
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293 }
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294 if (!have) break;
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2
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295 }
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296 }
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297
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298
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4
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299 void CONFIG::sleep(int duration, time_t &previous) {
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3
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300 ::sleep(duration);
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4
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301 time_t now = time(NULL);
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302 recorder.leak(now-previous, *this);
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303 previous = now;
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3
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304 }
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305
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306
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307 bool CONFIG::looking(int ip) {
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308 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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309 IPPAIR &p = *i;
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310 if ((p.first <= ip) && (ip <= p.last)) return false;
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311 }
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312 return true;
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313 }
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314
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315 ////////////////////////////////////////////////
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316 //
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317 SYSLOGCONFIG::SYSLOGCONFIG(TOKEN &tok, char *file_name_) {
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4
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318 tokp = &tok;
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2
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319 file_name = file_name_;
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4
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320 open(true);
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1
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321 }
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322
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323
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324 SYSLOGCONFIG::~SYSLOGCONFIG() {
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4
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325 close();
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3
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326 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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327 PATTERN *p = *i;
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328 delete p;
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329 }
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2
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330 }
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331
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332
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4
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333 void SYSLOGCONFIG::open(bool msg) {
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334 fd = ::open(file_name, O_RDONLY);
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335 len = 0;
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336 if (fd == -1) {
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337 if (msg) {
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338 char buf[maxlen];
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339 snprintf(buf, sizeof(buf), "syslog file %s not readable", file_name);
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340 tokp->token_error(buf);
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341 }
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342 }
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343 else {
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5
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344 if (debug_syslog > 1) {
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345 snprintf(buf, sizeof(buf), "syslog file %s opened", file_name);
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346 my_syslog(buf);
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347 }
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4
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348 lseek(fd, 0, SEEK_END);
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349 if (fstat(fd, &openfdstat)) {
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350 close();
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351 snprintf(buf, sizeof(buf), "syslog file %s cannot stat after open", file_name);
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352 tokp->token_error(buf);
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353 }
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354 }
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3
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355 }
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356
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357
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358 bool SYSLOGCONFIG::read(CONFIG &con) {
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4
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359 if (failed()) {
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360 open(false);
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361 if (failed()) return false;
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362 }
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3
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363 int n = ::read(fd, buf+len, buflen-len);
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364 bool have = (n > 0);
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365 if (have) {
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2
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366 len += n;
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367 while (true) {
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368 char *p = (char*)memchr(buf, '\n', len);
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369 if (!p) break;
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370 n = p-buf;
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371 *p = '\0';
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3
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372 process(con); // process null terminated string
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2
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373 len -= n+1;
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374 memmove(buf, p+1, len);
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375 }
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376 // no <lf> in a full buffer
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377 if (len == buflen) len = 0;
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378 }
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4
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379 else {
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380 // check for file close
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381 struct stat filenamest;
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382 if (0 == stat(file_name, &filenamest)) {
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383 if ((filenamest.st_dev != openfdstat.st_dev) ||
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384 (filenamest.st_ino != openfdstat.st_ino)) {
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385 close();
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386 }
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387 }
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388 else {
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389 // filename no longer exists
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390 close();
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391 }
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392 }
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3
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393 return have;
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2
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394 }
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395
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396
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4
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397 void SYSLOGCONFIG::close() {
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5
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398 if (debug_syslog > 1) {
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399 snprintf(buf, sizeof(buf), "syslog file %s closed", file_name);
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400 my_syslog(buf);
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401 }
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4
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402 if (fd != -1) ::close(fd);
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403 fd = -1;
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404 }
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405
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406
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407 void SYSLOGCONFIG::add_pattern(PATTERNP pat) {
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408 patterns.push_back(pat);
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409 }
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410
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411
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3
|
412 void SYSLOGCONFIG::process(CONFIG &con) {
|
|
20
|
413 int pi=0;
|
|
3
|
414 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
|
|
|
415 PATTERN *p = *i;
|
|
20
|
416 if (p->process(buf, con, file_name, pi)) break;
|
|
|
417 pi++;
|
|
3
|
418 }
|
|
1
|
419 }
|
|
|
420
|
|
|
421
|
|
|
422 void SYSLOGCONFIG::dump(int level) {
|
|
|
423 char indent[maxlen];
|
|
|
424 int i = min(maxlen-1, level*4);
|
|
|
425 memset(indent, ' ', i);
|
|
|
426 indent[i] = '\0';
|
|
|
427 char buf[maxlen];
|
|
|
428 printf("%s file \"%s\" {\n", indent, file_name);
|
|
3
|
429 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
|
|
|
430 PATTERN *p = *i;
|
|
4
|
431 p->dump(level+1);
|
|
3
|
432 }
|
|
1
|
433 printf("%s }; \n", indent);
|
|
|
434 }
|
|
|
435
|
|
|
436
|
|
|
437 ////////////////////////////////////////////////
|
|
|
438 // helper to discard the strings held by a string_set
|
|
|
439 //
|
|
|
440 void discard(string_set &s) {
|
|
|
441 for (string_set::iterator i=s.begin(); i!=s.end(); i++) {
|
|
|
442 free(*i);
|
|
|
443 }
|
|
|
444 s.clear();
|
|
|
445 }
|
|
|
446
|
|
|
447
|
|
|
448 ////////////////////////////////////////////////
|
|
|
449 // helper to register a string in a string set
|
|
|
450 //
|
|
|
451 char* register_string(string_set &s, char *name) {
|
|
|
452 string_set::iterator i = s.find(name);
|
|
|
453 if (i != s.end()) return *i;
|
|
|
454 char *x = strdup(name);
|
|
|
455 s.insert(x);
|
|
|
456 return x;
|
|
|
457 }
|
|
|
458
|
|
|
459
|
|
|
460 ////////////////////////////////////////////////
|
|
|
461 // register a global string
|
|
|
462 //
|
|
|
463 char* register_string(char *name) {
|
|
|
464 return register_string(all_strings, name);
|
|
|
465 }
|
|
|
466
|
|
|
467
|
|
|
468 ////////////////////////////////////////////////
|
|
|
469 //
|
|
|
470 bool tsa(TOKEN &tok, char *token);
|
|
|
471 bool tsa(TOKEN &tok, char *token) {
|
|
|
472 char *have = tok.next();
|
|
|
473 if (have == token) return true;
|
|
|
474 tok.token_error(token, have);
|
|
|
475 return false;
|
|
|
476 }
|
|
|
477
|
|
|
478
|
|
|
479 ////////////////////////////////////////////////
|
|
|
480 //
|
|
3
|
481 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con);
|
|
|
482 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con) {
|
|
|
483 char *pat = tok.next();
|
|
|
484 int ind, buc;
|
|
1
|
485 if (!tsa(tok, token_lbrace)) return false;
|
|
|
486 while (true) {
|
|
|
487 char *have = tok.next();
|
|
3
|
488 if (!have) break;
|
|
|
489 if (have == token_rbrace) break;
|
|
|
490 if (have == token_index) {
|
|
1
|
491 have = tok.next();
|
|
3
|
492 ind = atoi(have);
|
|
1
|
493 if (!tsa(tok, token_semi)) return false;
|
|
|
494 }
|
|
3
|
495 else if (have == token_bucket) {
|
|
|
496 have = tok.next();
|
|
|
497 buc = atoi(have);
|
|
|
498 if (!tsa(tok, token_semi)) return false;
|
|
1
|
499 }
|
|
|
500 else {
|
|
3
|
501 tok.token_error("index/bucket", have);
|
|
1
|
502 return false;
|
|
|
503 }
|
|
|
504 }
|
|
|
505 if (!tsa(tok, token_semi)) return false;
|
|
3
|
506 PATTERNP patt = new PATTERN(tok, pat, ind, buc);
|
|
|
507 con.add_pattern(patt);
|
|
|
508 return true;
|
|
|
509 }
|
|
|
510
|
|
|
511
|
|
|
512 ////////////////////////////////////////////////
|
|
|
513 //
|
|
|
514 bool parse_ignore(TOKEN &tok, CONFIG &dc);
|
|
|
515 bool parse_ignore(TOKEN &tok, CONFIG &dc) {
|
|
|
516 if (!tsa(tok, token_lbrace)) return false;
|
|
|
517 while (true) {
|
|
|
518 char *have = tok.next();
|
|
|
519 if (!have) break;
|
|
|
520 if (have == token_rbrace) break;
|
|
|
521 int ipaddr = ip_address(have);
|
|
|
522 if (ipaddr == 0) {
|
|
|
523 tok.token_error("ip address", have);
|
|
|
524 return false;
|
|
|
525 }
|
|
|
526 if (!tsa(tok, token_slash)) return false;
|
|
|
527 have = tok.next();
|
|
|
528 int mask = atoi(have);
|
|
|
529 if ((mask < 8) || (mask > 32)) {
|
|
|
530 tok.token_error("cidr 8..32 value", have);
|
|
|
531 return false;
|
|
|
532 }
|
|
|
533 if (!tsa(tok, token_semi)) return false;
|
|
|
534 IPPAIR pair;
|
|
|
535 const int masks[33] = {0xffffffff, // 0
|
|
|
536 0x7fffffff, // 1
|
|
|
537 0x3fffffff, // 2
|
|
|
538 0x1fffffff, // 3
|
|
|
539 0x0fffffff, // 4
|
|
|
540 0x07ffffff, // 5
|
|
|
541 0x03ffffff, // 6
|
|
|
542 0x01ffffff, // 7
|
|
|
543 0x00ffffff, // 8
|
|
|
544 0x007fffff, // 9
|
|
|
545 0x003fffff, // 10
|
|
|
546 0x001fffff, // 11
|
|
|
547 0x000fffff, // 12
|
|
|
548 0x0007ffff, // 13
|
|
|
549 0x0003ffff, // 14
|
|
|
550 0x0001ffff, // 15
|
|
|
551 0x0000ffff, // 16
|
|
|
552 0x00007fff, // 17
|
|
|
553 0x00003fff, // 18
|
|
|
554 0x00001fff, // 19
|
|
|
555 0x00000fff, // 20
|
|
|
556 0x000007ff, // 21
|
|
|
557 0x000003ff, // 22
|
|
|
558 0x000001ff, // 23
|
|
|
559 0x000000ff, // 24
|
|
|
560 0x0000007f, // 25
|
|
|
561 0x0000003f, // 26
|
|
|
562 0x0000001f, // 27
|
|
|
563 0x0000000f, // 28
|
|
|
564 0x00000007, // 29
|
|
|
565 0x00000003, // 30
|
|
|
566 0x00000001, // 31
|
|
|
567 0x00000000}; // 32
|
|
|
568 pair.first = ipaddr;
|
|
|
569 pair.last = ipaddr | masks[mask];
|
|
|
570 pair.cidr = mask;
|
|
|
571 dc.add_pair(pair);
|
|
|
572 }
|
|
|
573 if (!tsa(tok, token_semi)) return false;
|
|
|
574 return true;
|
|
|
575 }
|
|
|
576
|
|
|
577
|
|
|
578 ////////////////////////////////////////////////
|
|
|
579 //
|
|
|
580 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc);
|
|
|
581 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc) {
|
|
|
582 char *name = tok.next();
|
|
|
583 if (!tsa(tok, token_lbrace)) return false;
|
|
|
584 SYSLOGCONFIGP con = new SYSLOGCONFIG(tok, name);
|
|
2
|
585 if (con->failed()) {
|
|
|
586 delete con;
|
|
|
587 return false;
|
|
|
588 }
|
|
1
|
589 dc.add_syslogconfig(con);
|
|
3
|
590 while (true) {
|
|
|
591 char *have = tok.next();
|
|
|
592 if (!have) break;
|
|
|
593 if (have == token_rbrace) break;
|
|
|
594 if (have == token_pattern) {
|
|
|
595 if (!parse_pattern(tok, *con)) return false;
|
|
|
596 }
|
|
|
597 else {
|
|
|
598 tok.token_error("pattern", have);
|
|
|
599 return false;
|
|
|
600 }
|
|
|
601 }
|
|
|
602 if (!tsa(tok, token_semi)) return false;
|
|
1
|
603 return true;
|
|
|
604 }
|
|
|
605
|
|
|
606
|
|
|
607 ////////////////////////////////////////////////
|
|
|
608 // parse a config file
|
|
|
609 //
|
|
|
610 bool load_conf(CONFIG &dc, char *fn) {
|
|
|
611 int count = 0;
|
|
|
612 TOKEN tok(fn, &dc.config_files);
|
|
|
613 while (true) {
|
|
|
614 char *have = tok.next();
|
|
|
615 if (!have) break;
|
|
3
|
616 if (have == token_threshold) {
|
|
|
617 have = tok.next();
|
|
|
618 dc.set_threshold(atoi(have));
|
|
|
619 if (!tsa(tok, token_semi)) return false;
|
|
|
620 }
|
|
|
621 else if (have == token_ignore) {
|
|
|
622 if (!parse_ignore(tok, dc)) return false;
|
|
|
623 }
|
|
27
|
624 else if (have == token_add) {
|
|
|
625 have = tok.next();
|
|
|
626 dc.set_add(have);
|
|
|
627 if (!tsa(tok, token_semi)) return false;
|
|
|
628 }
|
|
|
629 else if (have == token_remove) {
|
|
|
630 have = tok.next();
|
|
|
631 dc.set_remove(have);
|
|
|
632 if (!tsa(tok, token_semi)) return false;
|
|
|
633 }
|
|
3
|
634 else if (have == token_file) {
|
|
|
635 if (!parse_syslogconfig(tok, dc)) return false;
|
|
|
636 count++;
|
|
1
|
637 }
|
|
|
638 else {
|
|
28
|
639 tok.token_error("threshold/ignore/add_command/remove_command/file", have);
|
|
1
|
640 return false;
|
|
|
641 }
|
|
|
642 }
|
|
|
643 tok.token_error("load_conf() found %d syslog files in %s", count, fn);
|
|
|
644 return (!dc.syslogconfigs.empty());
|
|
|
645 }
|
|
|
646
|
|
|
647
|
|
|
648 ////////////////////////////////////////////////
|
|
|
649 // init the tokens
|
|
|
650 //
|
|
|
651 void token_init() {
|
|
27
|
652 token_add = register_string("add_command");
|
|
3
|
653 token_bucket = register_string("bucket");
|
|
1
|
654 token_file = register_string("file");
|
|
3
|
655 token_ignore = register_string("ignore");
|
|
1
|
656 token_include = register_string("include");
|
|
3
|
657 token_index = register_string("index");
|
|
1
|
658 token_lbrace = register_string("{");
|
|
3
|
659 token_pattern = register_string("pattern");
|
|
1
|
660 token_rbrace = register_string("}");
|
|
27
|
661 token_remove = register_string("remove_command");
|
|
1
|
662 token_semi = register_string(";");
|
|
3
|
663 token_slash = register_string("/");
|
|
|
664 token_threshold = register_string("threshold");
|
|
1
|
665 }
|
