1 | /* $NetBSD: throttle.c,v 1.7 2011/03/14 17:18:13 tteras Exp $ */ |
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2 | |
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3 | /* Id: throttle.c,v 1.5 2006/04/05 20:54:50 manubsd Exp */ |
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4 | |
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5 | /* |
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6 | * Copyright (C) 2004 Emmanuel Dreyfus |
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7 | * All rights reserved. |
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8 | * |
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9 | * Redistribution and use in source and binary forms, with or without |
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10 | * modification, are permitted provided that the following conditions |
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11 | * are met: |
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12 | * 1. Redistributions of source code must retain the above copyright |
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13 | * notice, this list of conditions and the following disclaimer. |
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14 | * 2. Redistributions in binary form must reproduce the above copyright |
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15 | * notice, this list of conditions and the following disclaimer in the |
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16 | * documentation and/or other materials provided with the distribution. |
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17 | * 3. Neither the name of the project nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | */ |
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33 | |
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34 | #include "config.h" |
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35 | |
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36 | #include <stdlib.h> |
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37 | #include <string.h> |
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38 | #include <sys/param.h> |
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39 | #include <sys/queue.h> |
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40 | #include <netinet/in.h> |
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41 | #include <resolv.h> |
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42 | |
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43 | #include "vmbuf.h" |
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44 | #include "misc.h" |
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45 | #include "plog.h" |
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46 | #include "throttle.h" |
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47 | #include "sockmisc.h" |
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48 | #include "isakmp_var.h" |
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49 | #include "isakmp.h" |
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50 | #include "isakmp_xauth.h" |
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51 | #include "isakmp_cfg.h" |
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52 | #include "gcmalloc.h" |
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53 | |
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54 | static struct throttle_list throttle_list = |
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55 | TAILQ_HEAD_INITIALIZER(throttle_list); |
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56 | |
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57 | struct throttle_entry * |
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58 | throttle_add(addr) |
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59 | struct sockaddr *addr; |
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60 | { |
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61 | struct throttle_entry *te; |
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62 | struct timeval now, penalty; |
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63 | size_t len; |
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64 | |
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65 | len = sizeof(*te) |
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66 | - sizeof(struct sockaddr_storage) |
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67 | + sysdep_sa_len(addr); |
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68 | |
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69 | if ((te = racoon_malloc(len)) == NULL) |
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70 | return NULL; |
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71 | |
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72 | sched_get_monotonic_time(&now); |
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73 | penalty.tv_sec = isakmp_cfg_config.auth_throttle; |
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74 | penalty.tv_usec = 0; |
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75 | timeradd(&now, &penalty, &te->penalty_ends); |
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76 | |
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77 | memcpy(&te->host, addr, sysdep_sa_len(addr)); |
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78 | TAILQ_INSERT_HEAD(&throttle_list, te, next); |
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79 | |
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80 | return te; |
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81 | } |
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82 | |
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83 | int |
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84 | throttle_host(addr, authfail) |
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85 | struct sockaddr *addr; |
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86 | int authfail; |
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87 | { |
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88 | struct throttle_entry *te; |
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89 | struct timeval now, res; |
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90 | int found = 0; |
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91 | |
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92 | if (isakmp_cfg_config.auth_throttle == 0) |
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93 | return 0; |
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94 | |
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95 | sched_get_monotonic_time(&now); |
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96 | restart: |
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97 | RACOON_TAILQ_FOREACH_REVERSE(te, &throttle_list, throttle_list, next) { |
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98 | /* |
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99 | * Remove outdated entries |
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100 | */ |
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101 | if (timercmp(&te->penalty_ends, &now, <)) { |
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102 | TAILQ_REMOVE(&throttle_list, te, next); |
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103 | racoon_free(te); |
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104 | goto restart; |
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105 | } |
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106 | |
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107 | if (cmpsaddr(addr, (struct sockaddr *) &te->host) <= CMPSADDR_WOP_MATCH) { |
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108 | found = 1; |
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109 | break; |
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110 | } |
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111 | } |
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112 | |
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113 | /* |
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114 | * No match, if auth failed, allocate a new throttle entry |
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115 | * give no penalty even on error: this is the first time |
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116 | * and we are indulgent. |
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117 | */ |
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118 | if (!found) { |
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119 | if (authfail) { |
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120 | if ((te = throttle_add(addr)) == NULL) { |
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121 | plog(LLV_ERROR, LOCATION, NULL, |
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122 | "Throttle insertion failed\n"); |
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123 | return isakmp_cfg_config.auth_throttle; |
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124 | } |
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125 | } |
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126 | return 0; |
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127 | } else { |
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128 | /* |
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129 | * We had a match and auth failed, increase penalty. |
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130 | */ |
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131 | if (authfail) { |
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132 | struct timeval remaining, penalty; |
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133 | |
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134 | timersub(&te->penalty_ends, &now, &remaining); |
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135 | penalty.tv_sec = isakmp_cfg_config.auth_throttle; |
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136 | penalty.tv_usec = 0; |
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137 | timeradd(&penalty, &remaining, &res); |
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138 | if (res.tv_sec >= THROTTLE_PENALTY_MAX) { |
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139 | res.tv_sec = THROTTLE_PENALTY_MAX; |
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140 | res.tv_usec = 0; |
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141 | } |
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142 | timeradd(&now, &res, &te->penalty_ends); |
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143 | } |
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144 | } |
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145 | |
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146 | timersub(&te->penalty_ends, &now, &res); |
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147 | return res.tv_sec; |
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148 | } |
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149 | |
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