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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 /* AF_INET only */
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13
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14 typedef struct {
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15 in_addr_t mask;
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16 in_addr_t addr;
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17 unsigned deny;
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18 } ngx_http_access_rule_t;
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19
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20
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21 typedef struct {
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22 ngx_array_t *rules; /* array of ngx_http_access_rule_t */
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23 } ngx_http_access_loc_conf_t;
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24
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25
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26 static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
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27 static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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28 void *conf);
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29 static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
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30 static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
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31 void *parent, void *child);
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32 static ngx_int_t ngx_http_access_init(ngx_cycle_t *cycle);
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33
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34
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35 static ngx_command_t ngx_http_access_commands[] = {
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36
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37 { ngx_string("allow"),
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38 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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39 ngx_http_access_rule,
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40 NGX_HTTP_LOC_CONF_OFFSET,
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41 0,
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42 NULL },
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43
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44 { ngx_string("deny"),
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45 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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46 ngx_http_access_rule,
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47 NGX_HTTP_LOC_CONF_OFFSET,
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48 0,
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49 NULL },
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50
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51 ngx_null_command
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52 };
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53
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54
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55
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56 ngx_http_module_t ngx_http_access_module_ctx = {
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57 NULL, /* pre conf */
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58
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59 NULL, /* create main configuration */
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60 NULL, /* init main configuration */
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61
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62 NULL, /* create server configuration */
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63 NULL, /* merge server configuration */
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64
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65 ngx_http_access_create_loc_conf, /* create location configuration */
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66 ngx_http_access_merge_loc_conf /* merge location configuration */
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67 };
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68
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69
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70 ngx_module_t ngx_http_access_module = {
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71 NGX_MODULE,
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72 &ngx_http_access_module_ctx, /* module context */
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73 ngx_http_access_commands, /* module directives */
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74 NGX_HTTP_MODULE, /* module type */
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75 ngx_http_access_init, /* init module */
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76 NULL /* init process */
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77 };
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78
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79
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80 static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r)
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81 {
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82 ngx_uint_t i;
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28
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83 struct sockaddr_in *sin;
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0
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84 ngx_http_access_rule_t *rule;
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85 ngx_http_access_loc_conf_t *alcf;
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86
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87 alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
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88
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89 if (alcf->rules == NULL) {
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90 return NGX_OK;
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91 }
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92
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93 /* AF_INET only */
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94
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28
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95 sin = (struct sockaddr_in *) r->connection->sockaddr;
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0
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96
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97 rule = alcf->rules->elts;
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98 for (i = 0; i < alcf->rules->nelts; i++) {
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99
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100 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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101 "%08XD %08XD %08XD",
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28
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102 sin->sin_addr.s_addr, rule[i].mask, rule[i].addr);
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0
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103
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28
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104 if ((sin->sin_addr.s_addr & rule[i].mask) == rule[i].addr) {
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0
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105 if (rule[i].deny) {
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106 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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107 "access forbidden by rule");
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108
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109 return NGX_HTTP_FORBIDDEN;
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110 }
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111
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112 return NGX_OK;
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113 }
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114 }
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115
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116 return NGX_OK;
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117 }
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118
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119
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120 static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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121 void *conf)
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122 {
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123 ngx_http_access_loc_conf_t *alcf = conf;
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124
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125 ngx_str_t *value;
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126 ngx_inet_cidr_t in_cidr;
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127 ngx_http_access_rule_t *rule;
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128
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129 if (alcf->rules == NULL) {
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130 alcf->rules = ngx_create_array(cf->pool, 5,
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131 sizeof(ngx_http_access_rule_t));
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132 if (alcf->rules == NULL) {
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133 return NGX_CONF_ERROR;
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134 }
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135 }
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136
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137 if (!(rule = ngx_push_array(alcf->rules))) {
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138 return NGX_CONF_ERROR;
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139 }
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140
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141 value = cf->args->elts;
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142
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143 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
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144
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145 if (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0) {
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146 rule->mask = 0;
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147 rule->addr = 0;
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148
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149 return NGX_CONF_OK;
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150 }
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151
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152 rule->addr = inet_addr((char *) value[1].data);
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153
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154 if (rule->addr != INADDR_NONE) {
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155 rule->mask = 0xffffffff;
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156
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157 return NGX_CONF_OK;
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158 }
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159
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160 if (ngx_ptocidr(&value[1], &in_cidr) == NGX_ERROR) {
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161 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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162 &value[1]);
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163 return NGX_CONF_ERROR;
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164 }
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165
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166 rule->mask = in_cidr.mask;
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167 rule->addr = in_cidr.addr;
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168
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169 return NGX_CONF_OK;
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170 }
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171
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172
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173 static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf)
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174 {
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175 ngx_http_access_loc_conf_t *conf;
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176
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177 if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t)))) {
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178 return NGX_CONF_ERROR;
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179 }
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180
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181 return conf;
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182 }
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183
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184
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185 static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
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186 void *parent, void *child)
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187 {
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188 ngx_http_access_loc_conf_t *prev = parent;
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189 ngx_http_access_loc_conf_t *conf = child;
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190
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191 if (conf->rules == NULL) {
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192 conf->rules = prev->rules;
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193 }
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194
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195 return NGX_CONF_OK;
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196 }
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197
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198
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199 static ngx_int_t ngx_http_access_init(ngx_cycle_t *cycle)
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200 {
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201 ngx_http_handler_pt *h;
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202 ngx_http_core_main_conf_t *cmcf;
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203
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204 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
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205
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206 h = ngx_push_array(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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207 if (h == NULL) {
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208 return NGX_ERROR;
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209 }
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210
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211 *h = ngx_http_access_handler;
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212
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213 return NGX_OK;
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214 }
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