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50
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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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540
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13 in_addr_t mask;
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14 in_addr_t addr;
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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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540
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18 #if (NGX_HAVE_INET6)
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19
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20 typedef struct {
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540
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21 struct in6_addr addr;
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22 struct in6_addr mask;
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23 ngx_uint_t deny; /* unsigned deny:1; */
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24 } ngx_http_access_rule6_t;
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25
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26 #endif
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27
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28 typedef struct {
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29 ngx_array_t *rules; /* array of ngx_http_access_rule_t */
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30 #if (NGX_HAVE_INET6)
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31 ngx_array_t *rules6; /* array of ngx_http_access_rule6_t */
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32 #endif
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50
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33 } ngx_http_access_loc_conf_t;
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34
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35
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36 static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
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540
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37 static ngx_int_t ngx_http_access_inet(ngx_http_request_t *r,
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38 ngx_http_access_loc_conf_t *alcf, in_addr_t addr);
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39 #if (NGX_HAVE_INET6)
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40 static ngx_int_t ngx_http_access_inet6(ngx_http_request_t *r,
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41 ngx_http_access_loc_conf_t *alcf, u_char *p);
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42 #endif
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43 static ngx_int_t ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny);
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50
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44 static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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45 void *conf);
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46 static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
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47 static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
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48 void *parent, void *child);
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230
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49 static ngx_int_t ngx_http_access_init(ngx_conf_t *cf);
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50
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50
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51
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52 static ngx_command_t ngx_http_access_commands[] = {
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53
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54 { ngx_string("allow"),
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180
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55 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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56 |NGX_CONF_TAKE1,
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57 ngx_http_access_rule,
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58 NGX_HTTP_LOC_CONF_OFFSET,
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59 0,
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60 NULL },
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61
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62 { ngx_string("deny"),
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180
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63 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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64 |NGX_CONF_TAKE1,
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65 ngx_http_access_rule,
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66 NGX_HTTP_LOC_CONF_OFFSET,
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67 0,
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68 NULL },
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69
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70 ngx_null_command
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71 };
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72
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73
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74
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216
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75 static ngx_http_module_t ngx_http_access_module_ctx = {
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58
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76 NULL, /* preconfiguration */
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230
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77 ngx_http_access_init, /* postconfiguration */
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78
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79 NULL, /* create main configuration */
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80 NULL, /* init main configuration */
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81
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82 NULL, /* create server configuration */
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83 NULL, /* merge server configuration */
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84
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85 ngx_http_access_create_loc_conf, /* create location configuration */
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86 ngx_http_access_merge_loc_conf /* merge location configuration */
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87 };
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88
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89
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90 ngx_module_t ngx_http_access_module = {
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58
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91 NGX_MODULE_V1,
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50
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92 &ngx_http_access_module_ctx, /* module context */
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93 ngx_http_access_commands, /* module directives */
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94 NGX_HTTP_MODULE, /* module type */
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90
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95 NULL, /* init master */
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230
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96 NULL, /* init module */
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90
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97 NULL, /* init process */
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98 NULL, /* init thread */
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99 NULL, /* exit thread */
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100 NULL, /* exit process */
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101 NULL, /* exit master */
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102 NGX_MODULE_V1_PADDING
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50
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103 };
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104
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105
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106 static ngx_int_t
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107 ngx_http_access_handler(ngx_http_request_t *r)
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108 {
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109 struct sockaddr_in *sin;
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110 ngx_http_access_loc_conf_t *alcf;
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626
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111 #if (NGX_HAVE_INET6)
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112 u_char *p;
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113 in_addr_t addr;
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114 struct sockaddr_in6 *sin6;
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115 #endif
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50
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116
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117 alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
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118
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626
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119 switch (r->connection->sockaddr->sa_family) {
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120
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121 case AF_INET:
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122 if (alcf->rules) {
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123 sin = (struct sockaddr_in *) r->connection->sockaddr;
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124 return ngx_http_access_inet(r, alcf, sin->sin_addr.s_addr);
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125 }
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126 break;
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127
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540
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128 #if (NGX_HAVE_INET6)
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129
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626
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130 case AF_INET6:
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540
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131 sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
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132 p = sin6->sin6_addr.s6_addr;
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133
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626
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134 if (alcf->rules && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
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540
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135 addr = p[12] << 24;
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136 addr += p[13] << 16;
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137 addr += p[14] << 8;
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138 addr += p[15];
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139 return ngx_http_access_inet(r, alcf, htonl(addr));
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140 }
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141
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626
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142 if (alcf->rules6) {
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143 return ngx_http_access_inet6(r, alcf, p);
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144 }
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145
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540
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146 #endif
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448
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147 }
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148
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540
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149 return NGX_DECLINED;
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150 }
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151
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152
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153 static ngx_int_t
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154 ngx_http_access_inet(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
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155 in_addr_t addr)
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156 {
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157 ngx_uint_t i;
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158 ngx_http_access_rule_t *rule;
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159
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160 rule = alcf->rules->elts;
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161 for (i = 0; i < alcf->rules->nelts; i++) {
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162
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163 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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122
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164 "access: %08XD %08XD %08XD",
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540
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165 addr, rule[i].mask, rule[i].addr);
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212
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166
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540
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167 if ((addr & rule[i].mask) == rule[i].addr) {
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168 return ngx_http_access_found(r, rule[i].deny);
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169 }
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170 }
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171
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358
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172 return NGX_DECLINED;
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50
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173 }
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174
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175
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540
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176 #if (NGX_HAVE_INET6)
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177
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178 static ngx_int_t
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179 ngx_http_access_inet6(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
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180 u_char *p)
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181 {
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182 ngx_uint_t n;
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183 ngx_uint_t i;
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184 ngx_http_access_rule6_t *rule6;
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185
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186 rule6 = alcf->rules6->elts;
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187 for (i = 0; i < alcf->rules6->nelts; i++) {
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188
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189 #if (NGX_DEBUG)
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190 {
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191 size_t cl, ml, al;
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192 u_char ct[NGX_INET6_ADDRSTRLEN];
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193 u_char mt[NGX_INET6_ADDRSTRLEN];
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194 u_char at[NGX_INET6_ADDRSTRLEN];
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195
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196 cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
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197 ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
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198 al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);
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199
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200 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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540
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201 "access: %*s %*s %*s", cl, ct, ml, mt, al, at);
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202 }
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203 #endif
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204
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205 for (n = 0; n < 16; n++) {
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206 if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
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207 goto next;
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208 }
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209 }
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210
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211 return ngx_http_access_found(r, rule6[i].deny);
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212
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213 next:
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214 continue;
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215 }
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216
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217 return NGX_DECLINED;
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218 }
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219
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220 #endif
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221
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222
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223 static ngx_int_t
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224 ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny)
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225 {
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226 ngx_http_core_loc_conf_t *clcf;
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227
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228 if (deny) {
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229 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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230
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231 if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) {
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232 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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233 "access forbidden by rule");
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234 }
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235
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236 return NGX_HTTP_FORBIDDEN;
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237 }
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238
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239 return NGX_OK;
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240 }
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241
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242
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50
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243 static char *
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244 ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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245 {
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246 ngx_http_access_loc_conf_t *alcf = conf;
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247
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540
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248 ngx_int_t rc;
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249 ngx_uint_t all;
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250 ngx_str_t *value;
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251 ngx_cidr_t cidr;
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252 ngx_http_access_rule_t *rule;
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253 #if (NGX_HAVE_INET6)
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254 ngx_http_access_rule6_t *rule6;
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255 #endif
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256
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540
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257 ngx_memzero(&cidr, sizeof(ngx_cidr_t));
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258
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259 value = cf->args->elts;
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260
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540
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261 all = (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0);
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262
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263 if (!all) {
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264
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265 rc = ngx_ptocidr(&value[1], &cidr);
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266
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540
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267 if (rc == NGX_ERROR) {
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268 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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269 "invalid parameter \"%V\"", &value[1]);
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270 return NGX_CONF_ERROR;
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271 }
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272
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540
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273 if (rc == NGX_DONE) {
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274 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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275 "low address bits of %V are meaningless", &value[1]);
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276 }
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277 }
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278
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540
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279 switch (cidr.family) {
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280
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281 #if (NGX_HAVE_INET6)
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282 case AF_INET6:
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283 case 0: /* all */
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326
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284
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540
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285 if (alcf->rules6 == NULL) {
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286 alcf->rules6 = ngx_array_create(cf->pool, 4,
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287 sizeof(ngx_http_access_rule6_t));
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288 if (alcf->rules6 == NULL) {
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289 return NGX_CONF_ERROR;
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290 }
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291 }
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292
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293 rule6 = ngx_array_push(alcf->rules6);
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294 if (rule6 == NULL) {
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295 return NGX_CONF_ERROR;
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296 }
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297
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298 rule6->mask = cidr.u.in6.mask;
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299 rule6->addr = cidr.u.in6.addr;
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300 rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
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301
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540
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302 if (!all) {
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303 break;
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304 }
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305
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306 /* "all" passes through */
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307 #endif
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308
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309 default: /* AF_INET */
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454
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310
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540
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311 if (alcf->rules == NULL) {
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312 alcf->rules = ngx_array_create(cf->pool, 4,
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313 sizeof(ngx_http_access_rule_t));
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314 if (alcf->rules == NULL) {
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315 return NGX_CONF_ERROR;
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316 }
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317 }
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318
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319 rule = ngx_array_push(alcf->rules);
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320 if (rule == NULL) {
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321 return NGX_CONF_ERROR;
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322 }
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323
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324 rule->mask = cidr.u.in.mask;
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325 rule->addr = cidr.u.in.addr;
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326 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
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326
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327 }
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328
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329 return NGX_CONF_OK;
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330 }
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331
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332
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333 static void *
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334 ngx_http_access_create_loc_conf(ngx_conf_t *cf)
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335 {
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336 ngx_http_access_loc_conf_t *conf;
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337
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338 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t));
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339 if (conf == NULL) {
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496
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340 return NULL;
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50
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341 }
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342
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343 return conf;
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344 }
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345
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346
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347 static char *
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348 ngx_http_access_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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349 {
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350 ngx_http_access_loc_conf_t *prev = parent;
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351 ngx_http_access_loc_conf_t *conf = child;
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352
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353 if (conf->rules == NULL) {
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354 conf->rules = prev->rules;
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355 }
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356
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540
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357 #if (NGX_HAVE_INET6)
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358 if (conf->rules6 == NULL) {
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359 conf->rules6 = prev->rules6;
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360 }
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361 #endif
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362
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50
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363 return NGX_CONF_OK;
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364 }
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365
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366
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367 static ngx_int_t
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230
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368 ngx_http_access_init(ngx_conf_t *cf)
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50
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369 {
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370 ngx_http_handler_pt *h;
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371 ngx_http_core_main_conf_t *cmcf;
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372
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230
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373 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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50
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374
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375 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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376 if (h == NULL) {
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377 return NGX_ERROR;
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378 }
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379
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380 *h = ngx_http_access_handler;
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381
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382 return NGX_OK;
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383 }
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