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2260
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10 #include <ngx_md5.h>
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11
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12
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13 typedef struct {
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14 ngx_str_t secret;
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15 } ngx_http_secure_link_conf_t;
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16
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17
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18 static void *ngx_http_secure_link_create_conf(ngx_conf_t *cf);
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19 static char *ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent,
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20 void *child);
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21 static ngx_int_t ngx_http_secure_link_add_variables(ngx_conf_t *cf);
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22
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23
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24 static ngx_command_t ngx_http_secure_link_commands[] = {
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25
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26 { ngx_string("secure_link_secret"),
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27 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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28 ngx_conf_set_str_slot,
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29 NGX_HTTP_LOC_CONF_OFFSET,
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30 offsetof(ngx_http_secure_link_conf_t, secret),
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31 NULL },
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32
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33 ngx_null_command
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34 };
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35
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36
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37 static ngx_http_module_t ngx_http_secure_link_module_ctx = {
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38 ngx_http_secure_link_add_variables, /* preconfiguration */
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39 NULL, /* postconfiguration */
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40
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41 NULL, /* create main configuration */
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42 NULL, /* init main configuration */
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43
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44 NULL, /* create server configuration */
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45 NULL, /* merge server configuration */
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46
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47 ngx_http_secure_link_create_conf, /* create location configuration */
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48 ngx_http_secure_link_merge_conf /* merge location configuration */
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49 };
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50
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51
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52 ngx_module_t ngx_http_secure_link_module = {
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53 NGX_MODULE_V1,
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54 &ngx_http_secure_link_module_ctx, /* module context */
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55 ngx_http_secure_link_commands, /* module directives */
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56 NGX_HTTP_MODULE, /* module type */
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57 NULL, /* init master */
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58 NULL, /* init module */
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59 NULL, /* init process */
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60 NULL, /* init thread */
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61 NULL, /* exit thread */
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62 NULL, /* exit process */
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63 NULL, /* exit master */
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64 NGX_MODULE_V1_PADDING
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65 };
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66
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67
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68 static ngx_str_t ngx_http_secure_link = ngx_string("secure_link");
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69
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70
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71 static ngx_int_t
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72 ngx_http_secure_link_variable(ngx_http_request_t *r,
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73 ngx_http_variable_value_t *v, uintptr_t data)
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74 {
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75 u_char *p, *start, *end, *last;
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76 size_t len;
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77 ngx_int_t n;
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78 ngx_uint_t i;
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79 ngx_md5_t md5;
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80 ngx_http_secure_link_conf_t *conf;
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81 u_char hash[16];
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82
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83 conf = ngx_http_get_module_loc_conf(r, ngx_http_secure_link_module);
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84
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85 if (conf->secret.len == 0) {
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86 goto not_found;
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87 }
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88
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89 p = &r->unparsed_uri.data[1];
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90 last = r->unparsed_uri.data + r->unparsed_uri.len;
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91
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92 while (p < last) {
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93 if (*p++ == '/') {
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94 start = p;
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95 goto md5_start;
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96 }
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97 }
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98
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99 goto not_found;
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100
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101 md5_start:
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102
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103 while (p < last) {
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104 if (*p++ == '/') {
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105 end = p - 1;
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106 goto url_start;
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107 }
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108 }
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109
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110 goto not_found;
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111
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112 url_start:
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113
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114 len = last - p;
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115
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116 if (end - start != 32 || len < 3) {
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117 goto not_found;
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118 }
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119
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120 ngx_md5_init(&md5);
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121 ngx_md5_update(&md5, p, len);
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122 ngx_md5_update(&md5, conf->secret.data, conf->secret.len);
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123 ngx_md5_final(hash, &md5);
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124
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125 for (i = 0; i < 16; i++) {
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126 n = ngx_hextoi(&start[2 * i], 2);
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127 if (n == NGX_ERROR || n != hash[i]) {
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128 goto not_found;
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129 }
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130 }
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131
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132 v->len = len;
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133 v->valid = 1;
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134 v->no_cacheable = 0;
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135 v->not_found = 0;
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136 v->data = p;
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137
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138 return NGX_OK;
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139
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140 not_found:
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141
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142 v->not_found = 1;
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143
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144 return NGX_OK;
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145 }
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146
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147
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148 static void *
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149 ngx_http_secure_link_create_conf(ngx_conf_t *cf)
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150 {
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151 ngx_http_secure_link_conf_t *conf;
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152
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153 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_secure_link_conf_t));
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154 if (conf == NULL) {
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155 return NGX_CONF_ERROR;
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156 }
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157
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158 /*
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159 * set by ngx_pcalloc():
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160 *
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161 * conf->secret = { 0, NULL }
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162 */
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163
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164 return conf;
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165 }
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166
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167
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168 static char *
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169 ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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170 {
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171 ngx_http_secure_link_conf_t *prev = parent;
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172 ngx_http_secure_link_conf_t *conf = child;
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173
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174 ngx_conf_merge_str_value(conf->secret, prev->secret, "");
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175
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176 return NGX_CONF_OK;
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177 }
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178
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179
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180 static ngx_int_t
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181 ngx_http_secure_link_add_variables(ngx_conf_t *cf)
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182 {
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183 ngx_http_variable_t *var;
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184
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185 var = ngx_http_add_variable(cf, &ngx_http_secure_link, NGX_HTTP_VAR_NOHASH);
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186 if (var == NULL) {
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187 return NGX_ERROR;
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188 }
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189
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190 var->get_handler = ngx_http_secure_link_variable;
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191
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192 return NGX_OK;
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193 }
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