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