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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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668
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19 ngx_array_t *from; /* array of ngx_in_cidr_t */
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412
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20 ngx_uint_t type;
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21 ngx_uint_t hash;
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22 ngx_str_t header;
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540
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23 #if (NGX_HAVE_UNIX_DOMAIN)
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544
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24 ngx_uint_t unixsock; /* unsigned unixsock:2; */
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540
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25 #endif
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122
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26 } ngx_http_realip_loc_conf_t;
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27
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28
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396
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29 typedef struct {
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30 ngx_connection_t *connection;
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540
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31 struct sockaddr *sockaddr;
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32 socklen_t socklen;
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396
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33 ngx_str_t addr_text;
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34 } ngx_http_realip_ctx_t;
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35
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36
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122
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37 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
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540
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38 static ngx_int_t ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip,
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39 size_t len);
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396
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40 static void ngx_http_realip_cleanup(void *data);
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122
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41 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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42 void *conf);
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412
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43 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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122
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44 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
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45 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
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46 void *parent, void *child);
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230
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47 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
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122
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48
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49
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50 static ngx_command_t ngx_http_realip_commands[] = {
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51
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52 { ngx_string("set_real_ip_from"),
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53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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54 ngx_http_realip_from,
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55 NGX_HTTP_LOC_CONF_OFFSET,
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56 0,
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57 NULL },
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58
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59 { ngx_string("real_ip_header"),
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60 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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412
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61 ngx_http_realip,
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122
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62 NGX_HTTP_LOC_CONF_OFFSET,
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412
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63 0,
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64 NULL },
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122
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65
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66 ngx_null_command
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67 };
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68
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69
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70
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216
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71 static ngx_http_module_t ngx_http_realip_module_ctx = {
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122
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72 NULL, /* preconfiguration */
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230
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73 ngx_http_realip_init, /* postconfiguration */
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122
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74
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75 NULL, /* create main configuration */
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76 NULL, /* init main configuration */
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77
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78 NULL, /* create server configuration */
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79 NULL, /* merge server configuration */
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80
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81 ngx_http_realip_create_loc_conf, /* create location configuration */
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82 ngx_http_realip_merge_loc_conf /* merge location configuration */
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83 };
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84
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85
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86 ngx_module_t ngx_http_realip_module = {
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87 NGX_MODULE_V1,
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88 &ngx_http_realip_module_ctx, /* module context */
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89 ngx_http_realip_commands, /* module directives */
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90 NGX_HTTP_MODULE, /* module type */
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91 NULL, /* init master */
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230
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92 NULL, /* init module */
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122
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93 NULL, /* init process */
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94 NULL, /* init thread */
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95 NULL, /* exit thread */
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96 NULL, /* exit process */
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97 NULL, /* exit master */
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98 NGX_MODULE_V1_PADDING
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99 };
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100
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101
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102 static ngx_int_t
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103 ngx_http_realip_handler(ngx_http_request_t *r)
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104 {
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105 u_char *ip, *p;
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106 size_t len;
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412
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107 ngx_uint_t i, hash;
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108 ngx_list_part_t *part;
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109 ngx_table_elt_t *header;
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122
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110 struct sockaddr_in *sin;
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668
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111 ngx_in_cidr_t *from;
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396
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112 ngx_connection_t *c;
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113 ngx_http_realip_ctx_t *ctx;
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122
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114 ngx_http_realip_loc_conf_t *rlcf;
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115
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396
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116 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
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117
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118 if (ctx) {
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272
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119 return NGX_DECLINED;
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122
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120 }
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121
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122 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
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123
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542
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124 if (rlcf->from == NULL
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125 #if (NGX_HAVE_UNIX_DOMAIN)
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126 && !rlcf->unixsock
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127 #endif
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128 )
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129 {
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272
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130 return NGX_DECLINED;
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122
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131 }
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132
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412
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133 switch (rlcf->type) {
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134
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135 case NGX_HTTP_REALIP_XREALIP:
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136
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122
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137 if (r->headers_in.x_real_ip == NULL) {
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272
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138 return NGX_DECLINED;
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122
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139 }
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140
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141 len = r->headers_in.x_real_ip->value.len;
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142 ip = r->headers_in.x_real_ip->value.data;
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143
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412
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144 break;
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145
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146 case NGX_HTTP_REALIP_XFWD:
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147
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122
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148 if (r->headers_in.x_forwarded_for == NULL) {
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272
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149 return NGX_DECLINED;
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122
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150 }
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151
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152 len = r->headers_in.x_forwarded_for->value.len;
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153 ip = r->headers_in.x_forwarded_for->value.data;
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154
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286
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155 for (p = ip + len - 1; p > ip; p--) {
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122
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156 if (*p == ' ' || *p == ',') {
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286
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157 p++;
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158 len -= p - ip;
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159 ip = p;
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160 break;
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122
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161 }
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162 }
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412
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163
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164 break;
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165
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166 default: /* NGX_HTTP_REALIP_HEADER */
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167
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168 part = &r->headers_in.headers.part;
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169 header = part->elts;
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170
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171 hash = rlcf->hash;
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172 len = rlcf->header.len;
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173 p = rlcf->header.data;
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174
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175 for (i = 0; /* void */ ; i++) {
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176
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177 if (i >= part->nelts) {
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178 if (part->next == NULL) {
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179 break;
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180 }
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181
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182 part = part->next;
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183 header = part->elts;
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184 i = 0;
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185 }
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186
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187 if (hash == header[i].hash
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188 && len == header[i].key.len
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189 && ngx_strncmp(p, header[i].lowcase_key, len) == 0)
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190 {
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191 len = header[i].value.len;
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192 ip = header[i].value.data;
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193
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194 goto found;
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195 }
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196 }
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197
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198 return NGX_DECLINED;
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122
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199 }
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200
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412
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201 found:
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202
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396
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203 c = r->connection;
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204
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205 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip);
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286
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206
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122
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207 /* AF_INET only */
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208
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540
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209 if (c->sockaddr->sa_family == AF_INET) {
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210 sin = (struct sockaddr_in *) c->sockaddr;
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211
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212 from = rlcf->from->elts;
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213 for (i = 0; i < rlcf->from->nelts; i++) {
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214
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215 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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216 "realip: %08XD %08XD %08XD",
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217 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
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218
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219 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
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220 return ngx_http_realip_set_addr(r, ip, len);
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221 }
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222 }
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223 }
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224
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225 #if (NGX_HAVE_UNIX_DOMAIN)
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226
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227 if (c->sockaddr->sa_family == AF_UNIX && rlcf->unixsock) {
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228 return ngx_http_realip_set_addr(r, ip, len);
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448
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229 }
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230
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540
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231 #endif
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122
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232
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540
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233 return NGX_DECLINED;
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234 }
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122
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235
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236
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540
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237 static ngx_int_t
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238 ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip, size_t len)
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239 {
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240 u_char *p;
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241 ngx_int_t rc;
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242 ngx_addr_t addr;
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243 ngx_connection_t *c;
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244 ngx_pool_cleanup_t *cln;
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245 ngx_http_realip_ctx_t *ctx;
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286
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246
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540
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247 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
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248 if (cln == NULL) {
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249 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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250 }
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286
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251
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540
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252 ctx = cln->data;
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253 ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
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254
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255 c = r->connection;
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256
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257 rc = ngx_parse_addr(c->pool, &addr, ip, len);
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122
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258
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540
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259 switch (rc) {
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260 case NGX_DECLINED:
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261 return NGX_DECLINED;
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262 case NGX_ERROR:
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263 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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264 default: /* NGX_OK */
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265 break;
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266 }
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122
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267
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540
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268 p = ngx_pnalloc(c->pool, len);
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269 if (p == NULL) {
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270 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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271 }
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396
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272
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540
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273 ngx_memcpy(p, ip, len);
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396
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274
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540
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275 cln->handler = ngx_http_realip_cleanup;
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286
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276
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540
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277 ctx->connection = c;
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278 ctx->sockaddr = c->sockaddr;
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279 ctx->socklen = c->socklen;
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280 ctx->addr_text = c->addr_text;
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122
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281
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540
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282 c->sockaddr = addr.sockaddr;
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283 c->socklen = addr.socklen;
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284 c->addr_text.len = len;
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285 c->addr_text.data = p;
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122
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286
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272
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287 return NGX_DECLINED;
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122
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288 }
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289
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290
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396
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291 static void
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292 ngx_http_realip_cleanup(void *data)
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293 {
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294 ngx_http_realip_ctx_t *ctx = data;
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295
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540
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296 ngx_connection_t *c;
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396
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297
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298 c = ctx->connection;
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299
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540
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300 c->sockaddr = ctx->sockaddr;
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301 c->socklen = ctx->socklen;
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396
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302 c->addr_text = ctx->addr_text;
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303 }
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304
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305
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122
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306 static char *
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307 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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308 {
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309 ngx_http_realip_loc_conf_t *rlcf = conf;
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310
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412
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311 ngx_int_t rc;
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312 ngx_str_t *value;
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454
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313 ngx_cidr_t cidr;
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668
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314 ngx_in_cidr_t *from;
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122
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315
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540
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316 value = cf->args->elts;
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317
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318 #if (NGX_HAVE_UNIX_DOMAIN)
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319
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320 if (ngx_strcmp(value[1].data, "unix:") == 0) {
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321 rlcf->unixsock = 1;
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322 return NGX_CONF_OK;
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323 }
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324
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325 #endif
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326
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122
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327 if (rlcf->from == NULL) {
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328 rlcf->from = ngx_array_create(cf->pool, 2,
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668
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329 sizeof(ngx_in_cidr_t));
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122
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330 if (rlcf->from == NULL) {
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331 return NGX_CONF_ERROR;
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332 }
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333 }
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334
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335 from = ngx_array_push(rlcf->from);
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336 if (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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454
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340 rc = ngx_ptocidr(&value[1], &cidr);
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326
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341
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342 if (rc == NGX_ERROR) {
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122
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343 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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344 &value[1]);
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345 return NGX_CONF_ERROR;
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346 }
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347
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454
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348 if (cidr.family != AF_INET) {
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349 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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540
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350 "\"set_real_ip_from\" supports IPv4 only");
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454
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351 return NGX_CONF_ERROR;
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352 }
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353
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326
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354 if (rc == NGX_DONE) {
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355 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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356 "low address bits of %V are meaningless", &value[1]);
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357 }
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358
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454
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359 from->mask = cidr.u.in.mask;
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360 from->addr = cidr.u.in.addr;
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122
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361
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362 return NGX_CONF_OK;
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363 }
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364
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365
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412
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366 static char *
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367 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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368 {
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369 ngx_http_realip_loc_conf_t *rlcf = conf;
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370
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371 ngx_str_t *value;
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372
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373 value = cf->args->elts;
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374
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375 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) {
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376 rlcf->type = NGX_HTTP_REALIP_XREALIP;
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377 return NGX_CONF_OK;
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378 }
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379
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380 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) {
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381 rlcf->type = NGX_HTTP_REALIP_XFWD;
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382 return NGX_CONF_OK;
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383 }
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384
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385 rlcf->type = NGX_HTTP_REALIP_HEADER;
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386 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len);
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387 rlcf->header = value[1];
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388
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389 return NGX_CONF_OK;
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390 }
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391
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392
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122
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393 static void *
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394 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
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|
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395 {
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396 ngx_http_realip_loc_conf_t *conf;
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397
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398 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
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399 if (conf == NULL) {
|
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496
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400 return NULL;
|
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122
|
401 }
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|
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402
|
|
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403 /*
|
|
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404 * set by ngx_pcalloc():
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405 *
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406 * conf->from = NULL;
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412
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407 * conf->hash = 0;
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|
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408 * conf->header = { 0, NULL };
|
|
122
|
409 */
|
|
|
410
|
|
412
|
411 conf->type = NGX_CONF_UNSET_UINT;
|
|
544
|
412 #if (NGX_HAVE_UNIX_DOMAIN)
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|
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413 conf->unixsock = 2;
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|
|
414 #endif
|
|
122
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415
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|
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416 return conf;
|
|
|
417 }
|
|
|
418
|
|
|
419
|
|
|
420 static char *
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|
|
421 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
422 {
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|
|
423 ngx_http_realip_loc_conf_t *prev = parent;
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|
|
424 ngx_http_realip_loc_conf_t *conf = child;
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|
|
425
|
|
|
426 if (conf->from == NULL) {
|
|
|
427 conf->from = prev->from;
|
|
544
|
428 }
|
|
|
429
|
|
540
|
430 #if (NGX_HAVE_UNIX_DOMAIN)
|
|
544
|
431 if (conf->unixsock == 2) {
|
|
|
432 conf->unixsock = (prev->unixsock == 2) ? 0 : prev->unixsock;
|
|
|
433 }
|
|
540
|
434 #endif
|
|
122
|
435
|
|
412
|
436 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP);
|
|
|
437
|
|
|
438 if (conf->header.len == 0) {
|
|
|
439 conf->hash = prev->hash;
|
|
|
440 conf->header = prev->header;
|
|
|
441 }
|
|
122
|
442
|
|
|
443 return NGX_CONF_OK;
|
|
|
444 }
|
|
|
445
|
|
|
446
|
|
|
447 static ngx_int_t
|
|
230
|
448 ngx_http_realip_init(ngx_conf_t *cf)
|
|
122
|
449 {
|
|
|
450 ngx_http_handler_pt *h;
|
|
|
451 ngx_http_core_main_conf_t *cmcf;
|
|
|
452
|
|
230
|
453 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
122
|
454
|
|
|
455 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
|
|
|
456 if (h == NULL) {
|
|
|
457 return NGX_ERROR;
|
|
|
458 }
|
|
|
459
|
|
|
460 *h = ngx_http_realip_handler;
|
|
|
461
|
|
130
|
462 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
122
|
463 if (h == NULL) {
|
|
|
464 return NGX_ERROR;
|
|
|
465 }
|
|
|
466
|
|
|
467 *h = ngx_http_realip_handler;
|
|
|
468
|
|
|
469 return NGX_OK;
|
|
|
470 }
|
