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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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122
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17 ngx_uint_t deny; /* unsigned deny:1; */
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50
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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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180
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38 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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39 |NGX_CONF_TAKE1,
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40 ngx_http_access_rule,
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41 NGX_HTTP_LOC_CONF_OFFSET,
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42 0,
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43 NULL },
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44
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45 { ngx_string("deny"),
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180
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46 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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47 |NGX_CONF_TAKE1,
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50
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48 ngx_http_access_rule,
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49 NGX_HTTP_LOC_CONF_OFFSET,
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50 0,
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51 NULL },
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52
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53 ngx_null_command
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54 };
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55
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56
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57
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58 ngx_http_module_t ngx_http_access_module_ctx = {
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58
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59 NULL, /* preconfiguration */
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60 NULL, /* postconfiguration */
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61
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62 NULL, /* create main configuration */
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63 NULL, /* init main configuration */
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64
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65 NULL, /* create server configuration */
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66 NULL, /* merge server configuration */
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67
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68 ngx_http_access_create_loc_conf, /* create location configuration */
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69 ngx_http_access_merge_loc_conf /* merge location configuration */
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70 };
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71
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72
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73 ngx_module_t ngx_http_access_module = {
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58
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74 NGX_MODULE_V1,
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75 &ngx_http_access_module_ctx, /* module context */
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76 ngx_http_access_commands, /* module directives */
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77 NGX_HTTP_MODULE, /* module type */
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90
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78 NULL, /* init master */
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79 ngx_http_access_init, /* init module */
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90
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80 NULL, /* init process */
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81 NULL, /* init thread */
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82 NULL, /* exit thread */
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83 NULL, /* exit process */
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84 NULL, /* exit master */
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85 NGX_MODULE_V1_PADDING
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86 };
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87
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88
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89 static ngx_int_t
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90 ngx_http_access_handler(ngx_http_request_t *r)
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91 {
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92 ngx_uint_t i;
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93 struct sockaddr_in *sin;
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94 ngx_http_access_rule_t *rule;
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95 ngx_http_access_loc_conf_t *alcf;
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96
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97 alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
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98
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99 if (alcf->rules == NULL) {
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100 return NGX_OK;
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101 }
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102
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103 /* AF_INET only */
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104
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105 sin = (struct sockaddr_in *) r->connection->sockaddr;
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106
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107 rule = alcf->rules->elts;
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108 for (i = 0; i < alcf->rules->nelts; i++) {
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109
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110 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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122
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111 "access: %08XD %08XD %08XD",
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112 sin->sin_addr.s_addr, rule[i].mask, rule[i].addr);
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113
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114 if ((sin->sin_addr.s_addr & rule[i].mask) == rule[i].addr) {
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115 if (rule[i].deny) {
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116 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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117 "access forbidden by rule");
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118
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119 return NGX_HTTP_FORBIDDEN;
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120 }
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121
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122 return NGX_OK;
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123 }
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124 }
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125
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126 return NGX_OK;
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127 }
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128
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129
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130 static char *
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131 ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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132 {
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133 ngx_http_access_loc_conf_t *alcf = conf;
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134
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135 ngx_str_t *value;
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136 ngx_inet_cidr_t in_cidr;
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137 ngx_http_access_rule_t *rule;
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138
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139 if (alcf->rules == NULL) {
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140 alcf->rules = ngx_array_create(cf->pool, 4,
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141 sizeof(ngx_http_access_rule_t));
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142 if (alcf->rules == NULL) {
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143 return NGX_CONF_ERROR;
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144 }
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145 }
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146
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147 rule = ngx_array_push(alcf->rules);
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148 if (rule == NULL) {
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149 return NGX_CONF_ERROR;
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150 }
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151
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152 value = cf->args->elts;
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153
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154 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
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155
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156 if (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0) {
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157 rule->mask = 0;
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158 rule->addr = 0;
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159
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160 return NGX_CONF_OK;
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161 }
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162
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163 rule->addr = inet_addr((char *) value[1].data);
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164
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165 if (rule->addr != INADDR_NONE) {
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166 rule->mask = 0xffffffff;
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167
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168 return NGX_CONF_OK;
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169 }
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170
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171 if (ngx_ptocidr(&value[1], &in_cidr) == NGX_ERROR) {
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172 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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173 &value[1]);
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174 return NGX_CONF_ERROR;
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175 }
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176
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177 rule->mask = in_cidr.mask;
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178 rule->addr = in_cidr.addr;
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179
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180 return NGX_CONF_OK;
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181 }
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182
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183
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184 static void *
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185 ngx_http_access_create_loc_conf(ngx_conf_t *cf)
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186 {
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187 ngx_http_access_loc_conf_t *conf;
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188
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189 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t));
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190 if (conf == NULL) {
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191 return NGX_CONF_ERROR;
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192 }
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193
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194 return conf;
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195 }
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196
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197
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198 static char *
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199 ngx_http_access_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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200 {
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201 ngx_http_access_loc_conf_t *prev = parent;
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202 ngx_http_access_loc_conf_t *conf = child;
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203
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204 if (conf->rules == NULL) {
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205 conf->rules = prev->rules;
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206 }
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207
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208 return NGX_CONF_OK;
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209 }
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210
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211
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212 static ngx_int_t
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213 ngx_http_access_init(ngx_cycle_t *cycle)
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214 {
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215 ngx_http_handler_pt *h;
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216 ngx_http_core_main_conf_t *cmcf;
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217
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218 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
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219
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220 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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221 if (h == NULL) {
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222 return NGX_ERROR;
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223 }
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224
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225 *h = ngx_http_access_handler;
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226
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227 return NGX_OK;
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228 }
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