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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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660
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4 * Copyright (C) Nginx, Inc.
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50
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 typedef struct {
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540
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14 in_addr_t mask;
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15 in_addr_t addr;
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16 ngx_uint_t deny; /* unsigned deny:1; */
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50
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17 } ngx_http_access_rule_t;
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18
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540
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19 #if (NGX_HAVE_INET6)
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50
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20
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21 typedef struct {
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540
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22 struct in6_addr addr;
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23 struct in6_addr mask;
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24 ngx_uint_t deny; /* unsigned deny:1; */
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25 } ngx_http_access_rule6_t;
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26
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27 #endif
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28
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29 typedef struct {
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30 ngx_array_t *rules; /* array of ngx_http_access_rule_t */
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31 #if (NGX_HAVE_INET6)
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32 ngx_array_t *rules6; /* array of ngx_http_access_rule6_t */
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33 #endif
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50
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34 } ngx_http_access_loc_conf_t;
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35
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36
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37 static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
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540
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38 static ngx_int_t ngx_http_access_inet(ngx_http_request_t *r,
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39 ngx_http_access_loc_conf_t *alcf, in_addr_t addr);
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40 #if (NGX_HAVE_INET6)
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41 static ngx_int_t ngx_http_access_inet6(ngx_http_request_t *r,
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42 ngx_http_access_loc_conf_t *alcf, u_char *p);
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43 #endif
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44 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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45 static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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46 void *conf);
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47 static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
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48 static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
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49 void *parent, void *child);
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230
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50 static ngx_int_t ngx_http_access_init(ngx_conf_t *cf);
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50
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51
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52
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53 static ngx_command_t ngx_http_access_commands[] = {
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54
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55 { ngx_string("allow"),
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180
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56 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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57 |NGX_CONF_TAKE1,
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50
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58 ngx_http_access_rule,
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59 NGX_HTTP_LOC_CONF_OFFSET,
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60 0,
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61 NULL },
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62
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63 { ngx_string("deny"),
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180
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64 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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65 |NGX_CONF_TAKE1,
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66 ngx_http_access_rule,
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67 NGX_HTTP_LOC_CONF_OFFSET,
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68 0,
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69 NULL },
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70
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71 ngx_null_command
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72 };
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73
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74
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75
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216
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76 static ngx_http_module_t ngx_http_access_module_ctx = {
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58
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77 NULL, /* preconfiguration */
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230
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78 ngx_http_access_init, /* postconfiguration */
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79
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80 NULL, /* create main configuration */
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81 NULL, /* init main configuration */
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82
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83 NULL, /* create server configuration */
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84 NULL, /* merge server configuration */
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85
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86 ngx_http_access_create_loc_conf, /* create location configuration */
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87 ngx_http_access_merge_loc_conf /* merge location configuration */
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88 };
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89
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90
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91 ngx_module_t ngx_http_access_module = {
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58
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92 NGX_MODULE_V1,
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50
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93 &ngx_http_access_module_ctx, /* module context */
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94 ngx_http_access_commands, /* module directives */
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95 NGX_HTTP_MODULE, /* module type */
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90
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96 NULL, /* init master */
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230
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97 NULL, /* init module */
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90
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98 NULL, /* init process */
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99 NULL, /* init thread */
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100 NULL, /* exit thread */
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101 NULL, /* exit process */
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102 NULL, /* exit master */
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103 NGX_MODULE_V1_PADDING
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50
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104 };
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105
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106
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107 static ngx_int_t
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108 ngx_http_access_handler(ngx_http_request_t *r)
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109 {
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110 struct sockaddr_in *sin;
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111 ngx_http_access_loc_conf_t *alcf;
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626
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112 #if (NGX_HAVE_INET6)
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113 u_char *p;
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114 in_addr_t addr;
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115 struct sockaddr_in6 *sin6;
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116 #endif
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117
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118 alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
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119
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626
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120 switch (r->connection->sockaddr->sa_family) {
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121
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122 case AF_INET:
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123 if (alcf->rules) {
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124 sin = (struct sockaddr_in *) r->connection->sockaddr;
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125 return ngx_http_access_inet(r, alcf, sin->sin_addr.s_addr);
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126 }
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127 break;
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128
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540
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129 #if (NGX_HAVE_INET6)
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130
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626
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131 case AF_INET6:
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540
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132 sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
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133 p = sin6->sin6_addr.s6_addr;
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134
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626
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135 if (alcf->rules && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
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540
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136 addr = p[12] << 24;
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137 addr += p[13] << 16;
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138 addr += p[14] << 8;
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139 addr += p[15];
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140 return ngx_http_access_inet(r, alcf, htonl(addr));
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141 }
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142
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626
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143 if (alcf->rules6) {
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144 return ngx_http_access_inet6(r, alcf, p);
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145 }
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146
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540
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147 #endif
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448
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148 }
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149
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540
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150 return NGX_DECLINED;
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151 }
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152
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153
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154 static ngx_int_t
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155 ngx_http_access_inet(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
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156 in_addr_t addr)
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157 {
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158 ngx_uint_t i;
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159 ngx_http_access_rule_t *rule;
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160
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161 rule = alcf->rules->elts;
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162 for (i = 0; i < alcf->rules->nelts; i++) {
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163
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164 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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122
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165 "access: %08XD %08XD %08XD",
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540
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166 addr, rule[i].mask, rule[i].addr);
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212
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167
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540
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168 if ((addr & rule[i].mask) == rule[i].addr) {
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169 return ngx_http_access_found(r, rule[i].deny);
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170 }
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171 }
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172
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358
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173 return NGX_DECLINED;
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50
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174 }
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175
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176
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540
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177 #if (NGX_HAVE_INET6)
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178
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179 static ngx_int_t
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180 ngx_http_access_inet6(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
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181 u_char *p)
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182 {
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183 ngx_uint_t n;
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184 ngx_uint_t i;
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185 ngx_http_access_rule6_t *rule6;
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186
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187 rule6 = alcf->rules6->elts;
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188 for (i = 0; i < alcf->rules6->nelts; i++) {
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189
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190 #if (NGX_DEBUG)
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191 {
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192 size_t cl, ml, al;
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193 u_char ct[NGX_INET6_ADDRSTRLEN];
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194 u_char mt[NGX_INET6_ADDRSTRLEN];
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195 u_char at[NGX_INET6_ADDRSTRLEN];
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196
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197 cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
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198 ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
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199 al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);
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200
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586
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201 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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540
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202 "access: %*s %*s %*s", cl, ct, ml, mt, al, at);
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203 }
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204 #endif
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205
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206 for (n = 0; n < 16; n++) {
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207 if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
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208 goto next;
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209 }
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210 }
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211
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212 return ngx_http_access_found(r, rule6[i].deny);
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213
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214 next:
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215 continue;
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216 }
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217
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218 return NGX_DECLINED;
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219 }
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220
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221 #endif
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222
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223
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224 static ngx_int_t
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225 ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny)
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226 {
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227 ngx_http_core_loc_conf_t *clcf;
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228
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229 if (deny) {
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230 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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231
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232 if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) {
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233 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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234 "access forbidden by rule");
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235 }
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236
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237 return NGX_HTTP_FORBIDDEN;
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238 }
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239
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240 return NGX_OK;
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241 }
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242
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243
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50
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244 static char *
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245 ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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246 {
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247 ngx_http_access_loc_conf_t *alcf = conf;
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248
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540
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249 ngx_int_t rc;
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250 ngx_uint_t all;
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251 ngx_str_t *value;
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252 ngx_cidr_t cidr;
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253 ngx_http_access_rule_t *rule;
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254 #if (NGX_HAVE_INET6)
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255 ngx_http_access_rule6_t *rule6;
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256 #endif
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257
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540
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258 ngx_memzero(&cidr, sizeof(ngx_cidr_t));
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259
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260 value = cf->args->elts;
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261
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540
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262 all = (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0);
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263
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264 if (!all) {
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265
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266 rc = ngx_ptocidr(&value[1], &cidr);
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267
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540
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268 if (rc == NGX_ERROR) {
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269 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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270 "invalid parameter \"%V\"", &value[1]);
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271 return NGX_CONF_ERROR;
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272 }
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273
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540
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274 if (rc == NGX_DONE) {
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275 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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276 "low address bits of %V are meaningless", &value[1]);
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277 }
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50
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278 }
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279
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540
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280 switch (cidr.family) {
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281
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282 #if (NGX_HAVE_INET6)
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283 case AF_INET6:
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284 case 0: /* all */
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326
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285
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540
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286 if (alcf->rules6 == NULL) {
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287 alcf->rules6 = ngx_array_create(cf->pool, 4,
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288 sizeof(ngx_http_access_rule6_t));
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289 if (alcf->rules6 == NULL) {
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290 return NGX_CONF_ERROR;
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291 }
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292 }
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293
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294 rule6 = ngx_array_push(alcf->rules6);
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295 if (rule6 == NULL) {
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296 return NGX_CONF_ERROR;
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297 }
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298
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299 rule6->mask = cidr.u.in6.mask;
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300 rule6->addr = cidr.u.in6.addr;
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301 rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
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302
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540
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303 if (!all) {
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304 break;
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305 }
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306
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307 /* "all" passes through */
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308 #endif
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309
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310 default: /* AF_INET */
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454
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311
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540
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312 if (alcf->rules == NULL) {
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313 alcf->rules = ngx_array_create(cf->pool, 4,
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314 sizeof(ngx_http_access_rule_t));
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315 if (alcf->rules == NULL) {
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316 return NGX_CONF_ERROR;
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317 }
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318 }
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319
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320 rule = ngx_array_push(alcf->rules);
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321 if (rule == NULL) {
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322 return NGX_CONF_ERROR;
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323 }
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324
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325 rule->mask = cidr.u.in.mask;
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326 rule->addr = cidr.u.in.addr;
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327 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
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326
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328 }
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329
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50
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330 return NGX_CONF_OK;
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331 }
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332
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333
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334 static void *
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335 ngx_http_access_create_loc_conf(ngx_conf_t *cf)
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336 {
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337 ngx_http_access_loc_conf_t *conf;
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338
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339 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t));
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340 if (conf == NULL) {
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496
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341 return NULL;
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50
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342 }
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343
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344 return conf;
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345 }
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346
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347
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348 static char *
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349 ngx_http_access_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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350 {
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351 ngx_http_access_loc_conf_t *prev = parent;
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352 ngx_http_access_loc_conf_t *conf = child;
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353
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670
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354 #if (NGX_HAVE_INET6)
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355
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356 if (conf->rules == NULL && conf->rules6 == NULL) {
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357 conf->rules = prev->rules;
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358 conf->rules6 = prev->rules6;
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359 }
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360
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361 #else
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362
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50
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363 if (conf->rules == NULL) {
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364 conf->rules = prev->rules;
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365 }
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366
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540
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367 #endif
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368
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50
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369 return NGX_CONF_OK;
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370 }
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371
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372
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373 static ngx_int_t
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230
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374 ngx_http_access_init(ngx_conf_t *cf)
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50
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375 {
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376 ngx_http_handler_pt *h;
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377 ngx_http_core_main_conf_t *cmcf;
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378
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230
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379 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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50
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380
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381 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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382 if (h == NULL) {
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383 return NGX_ERROR;
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384 }
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385
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386 *h = ngx_http_access_handler;
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387
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388 return NGX_OK;
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389 }
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