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