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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 typedef struct {
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13 in_addr_t mask;
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14 in_addr_t addr;
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122
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15 ngx_uint_t deny; /* unsigned deny:1; */
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50
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16 } ngx_http_access_rule_t;
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17
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18
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19 typedef struct {
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20 ngx_array_t *rules; /* array of ngx_http_access_rule_t */
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21 } ngx_http_access_loc_conf_t;
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22
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23
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24 static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
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25 static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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26 void *conf);
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27 static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
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28 static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
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29 void *parent, void *child);
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230
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30 static ngx_int_t ngx_http_access_init(ngx_conf_t *cf);
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31
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32
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33 static ngx_command_t ngx_http_access_commands[] = {
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34
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35 { ngx_string("allow"),
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180
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36 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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37 |NGX_CONF_TAKE1,
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38 ngx_http_access_rule,
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39 NGX_HTTP_LOC_CONF_OFFSET,
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40 0,
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41 NULL },
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42
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43 { ngx_string("deny"),
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180
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44 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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45 |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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216
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56 static ngx_http_module_t ngx_http_access_module_ctx = {
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58
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57 NULL, /* preconfiguration */
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230
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58 ngx_http_access_init, /* postconfiguration */
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59
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60 NULL, /* create main configuration */
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61 NULL, /* init main configuration */
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62
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63 NULL, /* create server configuration */
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64 NULL, /* merge server configuration */
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65
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66 ngx_http_access_create_loc_conf, /* create location configuration */
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67 ngx_http_access_merge_loc_conf /* merge location configuration */
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68 };
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69
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70
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71 ngx_module_t ngx_http_access_module = {
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58
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72 NGX_MODULE_V1,
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73 &ngx_http_access_module_ctx, /* module context */
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74 ngx_http_access_commands, /* module directives */
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75 NGX_HTTP_MODULE, /* module type */
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90
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76 NULL, /* init master */
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230
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77 NULL, /* init module */
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90
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78 NULL, /* init process */
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79 NULL, /* init thread */
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80 NULL, /* exit thread */
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81 NULL, /* exit process */
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82 NULL, /* exit master */
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83 NGX_MODULE_V1_PADDING
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84 };
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85
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86
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87 static ngx_int_t
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88 ngx_http_access_handler(ngx_http_request_t *r)
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89 {
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90 ngx_uint_t i;
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91 struct sockaddr_in *sin;
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92 ngx_http_access_rule_t *rule;
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212
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93 ngx_http_core_loc_conf_t *clcf;
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94 ngx_http_access_loc_conf_t *alcf;
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95
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96 alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
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97
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98 if (alcf->rules == NULL) {
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358
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99 return NGX_DECLINED;
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50
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100 }
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101
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102 /* AF_INET only */
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103
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448
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104 if (r->connection->sockaddr->sa_family != AF_INET) {
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105 return NGX_DECLINED;
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106 }
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107
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108 sin = (struct sockaddr_in *) r->connection->sockaddr;
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109
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110 rule = alcf->rules->elts;
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111 for (i = 0; i < alcf->rules->nelts; i++) {
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112
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113 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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122
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114 "access: %08XD %08XD %08XD",
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115 sin->sin_addr.s_addr, rule[i].mask, rule[i].addr);
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116
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117 if ((sin->sin_addr.s_addr & rule[i].mask) == rule[i].addr) {
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118 if (rule[i].deny) {
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212
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119 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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120
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362
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121 if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) {
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212
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122 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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123 "access forbidden by rule");
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124 }
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125
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126 return NGX_HTTP_FORBIDDEN;
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127 }
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128
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129 return NGX_OK;
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130 }
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131 }
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132
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358
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133 return NGX_DECLINED;
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134 }
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135
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136
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137 static char *
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138 ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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139 {
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140 ngx_http_access_loc_conf_t *alcf = conf;
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141
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326
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142 ngx_int_t rc;
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143 ngx_str_t *value;
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454
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144 ngx_cidr_t cidr;
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145 ngx_http_access_rule_t *rule;
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146
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147 if (alcf->rules == NULL) {
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148 alcf->rules = ngx_array_create(cf->pool, 4,
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149 sizeof(ngx_http_access_rule_t));
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150 if (alcf->rules == NULL) {
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151 return NGX_CONF_ERROR;
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152 }
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153 }
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154
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155 rule = ngx_array_push(alcf->rules);
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156 if (rule == NULL) {
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157 return NGX_CONF_ERROR;
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158 }
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159
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160 value = cf->args->elts;
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161
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162 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
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163
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164 if (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0) {
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165 rule->mask = 0;
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166 rule->addr = 0;
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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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454
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171 rc = ngx_ptocidr(&value[1], &cidr);
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326
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172
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173 if (rc == NGX_ERROR) {
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174 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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175 &value[1]);
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176 return NGX_CONF_ERROR;
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177 }
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178
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454
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179 if (cidr.family != AF_INET) {
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180 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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181 "\"allow\" supports IPv4 only");
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182 return NGX_CONF_ERROR;
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183 }
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184
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326
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185 if (rc == NGX_DONE) {
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186 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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187 "low address bits of %V are meaningless", &value[1]);
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188 }
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189
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454
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190 rule->mask = cidr.u.in.mask;
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191 rule->addr = cidr.u.in.addr;
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192
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193 return NGX_CONF_OK;
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194 }
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195
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196
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197 static void *
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198 ngx_http_access_create_loc_conf(ngx_conf_t *cf)
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199 {
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200 ngx_http_access_loc_conf_t *conf;
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201
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202 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t));
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203 if (conf == NULL) {
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204 return NGX_CONF_ERROR;
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205 }
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206
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207 return conf;
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208 }
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209
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210
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211 static char *
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212 ngx_http_access_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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213 {
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214 ngx_http_access_loc_conf_t *prev = parent;
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215 ngx_http_access_loc_conf_t *conf = child;
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216
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217 if (conf->rules == NULL) {
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218 conf->rules = prev->rules;
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219 }
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220
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221 return NGX_CONF_OK;
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222 }
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223
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224
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225 static ngx_int_t
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230
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226 ngx_http_access_init(ngx_conf_t *cf)
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227 {
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228 ngx_http_handler_pt *h;
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229 ngx_http_core_main_conf_t *cmcf;
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230
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230
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231 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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232
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233 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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234 if (h == NULL) {
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235 return NGX_ERROR;
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236 }
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237
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238 *h = ngx_http_access_handler;
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239
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240 return NGX_OK;
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241 }
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