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122
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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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122
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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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412
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13 #define NGX_HTTP_REALIP_XREALIP 0
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14 #define NGX_HTTP_REALIP_XFWD 1
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15 #define NGX_HTTP_REALIP_HEADER 2
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16
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17
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122
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18 typedef struct {
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396
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19 in_addr_t mask;
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20 in_addr_t addr;
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122
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21 } ngx_http_realip_from_t;
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22
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23
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24 typedef struct {
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396
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25 ngx_array_t *from; /* array of ngx_http_realip_from_t */
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412
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26 ngx_uint_t type;
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27 ngx_uint_t hash;
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28 ngx_str_t header;
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540
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29 #if (NGX_HAVE_UNIX_DOMAIN)
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544
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30 ngx_uint_t unixsock; /* unsigned unixsock:2; */
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540
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31 #endif
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122
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32 } ngx_http_realip_loc_conf_t;
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33
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34
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396
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35 typedef struct {
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36 ngx_connection_t *connection;
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540
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37 struct sockaddr *sockaddr;
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38 socklen_t socklen;
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396
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39 ngx_str_t addr_text;
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40 } ngx_http_realip_ctx_t;
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41
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42
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122
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43 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
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540
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44 static ngx_int_t ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip,
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45 size_t len);
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396
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46 static void ngx_http_realip_cleanup(void *data);
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122
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47 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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48 void *conf);
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412
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49 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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122
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50 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
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51 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
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52 void *parent, void *child);
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230
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53 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
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122
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54
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55
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56 static ngx_command_t ngx_http_realip_commands[] = {
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57
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58 { ngx_string("set_real_ip_from"),
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59 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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60 ngx_http_realip_from,
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61 NGX_HTTP_LOC_CONF_OFFSET,
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62 0,
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63 NULL },
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64
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65 { ngx_string("real_ip_header"),
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66 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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412
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67 ngx_http_realip,
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122
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68 NGX_HTTP_LOC_CONF_OFFSET,
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412
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69 0,
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70 NULL },
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122
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71
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72 ngx_null_command
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73 };
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74
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75
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76
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216
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77 static ngx_http_module_t ngx_http_realip_module_ctx = {
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122
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78 NULL, /* preconfiguration */
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230
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79 ngx_http_realip_init, /* postconfiguration */
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122
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80
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81 NULL, /* create main configuration */
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82 NULL, /* init main configuration */
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83
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84 NULL, /* create server configuration */
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85 NULL, /* merge server configuration */
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86
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87 ngx_http_realip_create_loc_conf, /* create location configuration */
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88 ngx_http_realip_merge_loc_conf /* merge location configuration */
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89 };
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90
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91
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92 ngx_module_t ngx_http_realip_module = {
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93 NGX_MODULE_V1,
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94 &ngx_http_realip_module_ctx, /* module context */
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95 ngx_http_realip_commands, /* module directives */
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96 NGX_HTTP_MODULE, /* module type */
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97 NULL, /* init master */
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230
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98 NULL, /* init module */
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122
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99 NULL, /* init process */
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100 NULL, /* init thread */
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101 NULL, /* exit thread */
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102 NULL, /* exit process */
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103 NULL, /* exit master */
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104 NGX_MODULE_V1_PADDING
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105 };
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106
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107
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108 static ngx_int_t
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109 ngx_http_realip_handler(ngx_http_request_t *r)
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110 {
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111 u_char *ip, *p;
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112 size_t len;
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412
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113 ngx_uint_t i, hash;
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114 ngx_list_part_t *part;
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115 ngx_table_elt_t *header;
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122
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116 struct sockaddr_in *sin;
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396
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117 ngx_connection_t *c;
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118 ngx_http_realip_ctx_t *ctx;
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122
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119 ngx_http_realip_from_t *from;
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120 ngx_http_realip_loc_conf_t *rlcf;
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121
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396
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122 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
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123
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124 if (ctx) {
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272
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125 return NGX_DECLINED;
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122
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126 }
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127
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128 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
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129
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542
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130 if (rlcf->from == NULL
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131 #if (NGX_HAVE_UNIX_DOMAIN)
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132 && !rlcf->unixsock
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133 #endif
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134 )
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135 {
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272
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136 return NGX_DECLINED;
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122
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137 }
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138
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412
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139 switch (rlcf->type) {
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140
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141 case NGX_HTTP_REALIP_XREALIP:
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142
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122
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143 if (r->headers_in.x_real_ip == NULL) {
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272
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144 return NGX_DECLINED;
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122
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145 }
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146
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147 len = r->headers_in.x_real_ip->value.len;
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148 ip = r->headers_in.x_real_ip->value.data;
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149
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412
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150 break;
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151
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152 case NGX_HTTP_REALIP_XFWD:
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153
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122
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154 if (r->headers_in.x_forwarded_for == NULL) {
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272
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155 return NGX_DECLINED;
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122
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156 }
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157
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158 len = r->headers_in.x_forwarded_for->value.len;
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159 ip = r->headers_in.x_forwarded_for->value.data;
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160
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286
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161 for (p = ip + len - 1; p > ip; p--) {
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122
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162 if (*p == ' ' || *p == ',') {
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286
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163 p++;
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164 len -= p - ip;
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165 ip = p;
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166 break;
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122
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167 }
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168 }
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412
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169
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170 break;
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171
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172 default: /* NGX_HTTP_REALIP_HEADER */
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173
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174 part = &r->headers_in.headers.part;
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175 header = part->elts;
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176
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177 hash = rlcf->hash;
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178 len = rlcf->header.len;
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179 p = rlcf->header.data;
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180
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181 for (i = 0; /* void */ ; i++) {
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182
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183 if (i >= part->nelts) {
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184 if (part->next == NULL) {
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185 break;
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186 }
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187
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188 part = part->next;
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189 header = part->elts;
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190 i = 0;
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191 }
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192
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193 if (hash == header[i].hash
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194 && len == header[i].key.len
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195 && ngx_strncmp(p, header[i].lowcase_key, len) == 0)
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196 {
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197 len = header[i].value.len;
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198 ip = header[i].value.data;
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199
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200 goto found;
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201 }
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202 }
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203
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204 return NGX_DECLINED;
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122
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205 }
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206
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412
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207 found:
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208
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396
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209 c = r->connection;
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210
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211 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip);
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286
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212
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122
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213 /* AF_INET only */
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214
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540
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215 if (c->sockaddr->sa_family == AF_INET) {
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216 sin = (struct sockaddr_in *) c->sockaddr;
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217
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218 from = rlcf->from->elts;
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219 for (i = 0; i < rlcf->from->nelts; i++) {
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220
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221 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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222 "realip: %08XD %08XD %08XD",
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223 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
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224
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225 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
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226 return ngx_http_realip_set_addr(r, ip, len);
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227 }
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228 }
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229 }
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230
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231 #if (NGX_HAVE_UNIX_DOMAIN)
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232
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233 if (c->sockaddr->sa_family == AF_UNIX && rlcf->unixsock) {
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234 return ngx_http_realip_set_addr(r, ip, len);
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448
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235 }
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236
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540
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237 #endif
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122
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238
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540
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239 return NGX_DECLINED;
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240 }
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122
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241
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242
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540
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243 static ngx_int_t
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244 ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip, size_t len)
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245 {
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246 u_char *p;
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247 ngx_int_t rc;
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248 ngx_addr_t addr;
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249 ngx_connection_t *c;
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250 ngx_pool_cleanup_t *cln;
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251 ngx_http_realip_ctx_t *ctx;
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286
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252
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540
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253 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
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254 if (cln == NULL) {
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255 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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256 }
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286
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257
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540
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258 ctx = cln->data;
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259 ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
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260
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261 c = r->connection;
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262
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263 rc = ngx_parse_addr(c->pool, &addr, ip, len);
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122
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264
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540
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265 switch (rc) {
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266 case NGX_DECLINED:
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267 return NGX_DECLINED;
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268 case NGX_ERROR:
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269 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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270 default: /* NGX_OK */
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271 break;
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272 }
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122
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273
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540
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274 p = ngx_pnalloc(c->pool, len);
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275 if (p == NULL) {
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276 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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277 }
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396
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278
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540
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279 ngx_memcpy(p, ip, len);
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396
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280
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540
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281 cln->handler = ngx_http_realip_cleanup;
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286
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282
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540
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283 ctx->connection = c;
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284 ctx->sockaddr = c->sockaddr;
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285 ctx->socklen = c->socklen;
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286 ctx->addr_text = c->addr_text;
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122
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287
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540
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288 c->sockaddr = addr.sockaddr;
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289 c->socklen = addr.socklen;
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290 c->addr_text.len = len;
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291 c->addr_text.data = p;
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122
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292
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272
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293 return NGX_DECLINED;
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122
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294 }
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295
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296
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396
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297 static void
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298 ngx_http_realip_cleanup(void *data)
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299 {
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300 ngx_http_realip_ctx_t *ctx = data;
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301
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540
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302 ngx_connection_t *c;
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396
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303
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304 c = ctx->connection;
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305
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540
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306 c->sockaddr = ctx->sockaddr;
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307 c->socklen = ctx->socklen;
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396
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308 c->addr_text = ctx->addr_text;
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309 }
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310
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311
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122
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312 static char *
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313 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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314 {
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315 ngx_http_realip_loc_conf_t *rlcf = conf;
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316
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412
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317 ngx_int_t rc;
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318 ngx_str_t *value;
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454
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319 ngx_cidr_t cidr;
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412
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320 ngx_http_realip_from_t *from;
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122
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321
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540
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322 value = cf->args->elts;
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323
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324 #if (NGX_HAVE_UNIX_DOMAIN)
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325
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326 if (ngx_strcmp(value[1].data, "unix:") == 0) {
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327 rlcf->unixsock = 1;
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328 return NGX_CONF_OK;
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329 }
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330
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331 #endif
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332
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122
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333 if (rlcf->from == NULL) {
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334 rlcf->from = ngx_array_create(cf->pool, 2,
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335 sizeof(ngx_http_realip_from_t));
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336 if (rlcf->from == NULL) {
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337 return NGX_CONF_ERROR;
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338 }
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339 }
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340
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341 from = ngx_array_push(rlcf->from);
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342 if (from == NULL) {
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343 return NGX_CONF_ERROR;
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344 }
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345
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454
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346 rc = ngx_ptocidr(&value[1], &cidr);
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326
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347
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348 if (rc == NGX_ERROR) {
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122
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349 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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350 &value[1]);
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351 return NGX_CONF_ERROR;
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352 }
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353
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454
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354 if (cidr.family != AF_INET) {
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355 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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540
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356 "\"set_real_ip_from\" supports IPv4 only");
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454
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357 return NGX_CONF_ERROR;
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358 }
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359
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326
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360 if (rc == NGX_DONE) {
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361 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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362 "low address bits of %V are meaningless", &value[1]);
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363 }
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364
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454
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365 from->mask = cidr.u.in.mask;
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366 from->addr = cidr.u.in.addr;
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122
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367
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368 return NGX_CONF_OK;
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369 }
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370
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371
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412
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372 static char *
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373 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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374 {
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375 ngx_http_realip_loc_conf_t *rlcf = conf;
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376
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377 ngx_str_t *value;
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378
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379 value = cf->args->elts;
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380
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381 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) {
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382 rlcf->type = NGX_HTTP_REALIP_XREALIP;
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383 return NGX_CONF_OK;
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384 }
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385
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386 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) {
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387 rlcf->type = NGX_HTTP_REALIP_XFWD;
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388 return NGX_CONF_OK;
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389 }
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390
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391 rlcf->type = NGX_HTTP_REALIP_HEADER;
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392 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len);
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393 rlcf->header = value[1];
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394
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395 return NGX_CONF_OK;
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396 }
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397
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398
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122
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399 static void *
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400 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
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401 {
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402 ngx_http_realip_loc_conf_t *conf;
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403
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404 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
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405 if (conf == NULL) {
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496
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406 return NULL;
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122
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407 }
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408
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409 /*
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410 * set by ngx_pcalloc():
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411 *
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412 * conf->from = NULL;
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412
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413 * conf->hash = 0;
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414 * conf->header = { 0, NULL };
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122
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415 */
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416
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412
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417 conf->type = NGX_CONF_UNSET_UINT;
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544
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418 #if (NGX_HAVE_UNIX_DOMAIN)
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419 conf->unixsock = 2;
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420 #endif
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122
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421
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422 return conf;
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423 }
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424
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425
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426 static char *
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427 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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428 {
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429 ngx_http_realip_loc_conf_t *prev = parent;
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430 ngx_http_realip_loc_conf_t *conf = child;
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431
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432 if (conf->from == NULL) {
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433 conf->from = prev->from;
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544
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434 }
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435
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540
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436 #if (NGX_HAVE_UNIX_DOMAIN)
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544
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437 if (conf->unixsock == 2) {
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438 conf->unixsock = (prev->unixsock == 2) ? 0 : prev->unixsock;
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439 }
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540
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440 #endif
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122
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441
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412
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442 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP);
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443
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444 if (conf->header.len == 0) {
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445 conf->hash = prev->hash;
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446 conf->header = prev->header;
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447 }
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122
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448
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449 return NGX_CONF_OK;
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450 }
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451
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452
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453 static ngx_int_t
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230
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454 ngx_http_realip_init(ngx_conf_t *cf)
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122
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455 {
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456 ngx_http_handler_pt *h;
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457 ngx_http_core_main_conf_t *cmcf;
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458
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230
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459 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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122
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460
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461 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
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462 if (h == NULL) {
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463 return NGX_ERROR;
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464 }
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465
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466 *h = ngx_http_realip_handler;
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467
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130
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468 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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122
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469 if (h == NULL) {
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470 return NGX_ERROR;
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471 }
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472
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473 *h = ngx_http_realip_handler;
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474
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475 return NGX_OK;
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476 }
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