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412
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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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596
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14 ngx_http_complex_value_t *variable;
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15 ngx_http_complex_value_t *md5;
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16 ngx_str_t secret;
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17 ngx_flag_t expires;
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412
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18 } ngx_http_secure_link_conf_t;
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19
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20
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596
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21 typedef struct {
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22 ngx_str_t expires;
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23 } ngx_http_secure_link_ctx_t;
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24
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25
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26 static ngx_int_t ngx_http_secure_link_old_variable(ngx_http_request_t *r,
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27 ngx_http_secure_link_conf_t *conf, ngx_http_variable_value_t *v,
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28 uintptr_t data);
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29 static ngx_int_t ngx_http_secure_link_expires_variable(ngx_http_request_t *r,
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30 ngx_http_variable_value_t *v, uintptr_t data);
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412
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31 static void *ngx_http_secure_link_create_conf(ngx_conf_t *cf);
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32 static char *ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent,
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33 void *child);
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34 static ngx_int_t ngx_http_secure_link_add_variables(ngx_conf_t *cf);
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35
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36
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37 static ngx_command_t ngx_http_secure_link_commands[] = {
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38
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596
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39 { ngx_string("secure_link"),
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40 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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41 ngx_http_set_comlex_value_slot,
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42 NGX_HTTP_LOC_CONF_OFFSET,
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43 offsetof(ngx_http_secure_link_conf_t, variable),
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44 NULL },
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45
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46 { ngx_string("secure_link_md5"),
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47 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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48 ngx_http_set_comlex_value_slot,
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49 NGX_HTTP_LOC_CONF_OFFSET,
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50 offsetof(ngx_http_secure_link_conf_t, md5),
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51 NULL },
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52
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53 { ngx_string("secure_link_expires"),
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54 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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55 ngx_conf_set_flag_slot,
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56 NGX_HTTP_LOC_CONF_OFFSET,
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57 offsetof(ngx_http_secure_link_conf_t, expires),
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58 NULL },
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59
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412
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60 { ngx_string("secure_link_secret"),
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61 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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62 ngx_conf_set_str_slot,
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63 NGX_HTTP_LOC_CONF_OFFSET,
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64 offsetof(ngx_http_secure_link_conf_t, secret),
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65 NULL },
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66
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67 ngx_null_command
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68 };
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69
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70
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71 static ngx_http_module_t ngx_http_secure_link_module_ctx = {
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72 ngx_http_secure_link_add_variables, /* preconfiguration */
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73 NULL, /* postconfiguration */
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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_secure_link_create_conf, /* create location configuration */
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82 ngx_http_secure_link_merge_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_secure_link_module = {
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87 NGX_MODULE_V1,
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88 &ngx_http_secure_link_module_ctx, /* module context */
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89 ngx_http_secure_link_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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92 NULL, /* init module */
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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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596
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102 static ngx_str_t ngx_http_secure_link_name = ngx_string("secure_link");
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103 static ngx_str_t ngx_http_secure_link_expires_name =
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104 ngx_string("secure_link_expires");
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412
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105
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106
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107 static ngx_int_t
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108 ngx_http_secure_link_variable(ngx_http_request_t *r,
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596
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109 ngx_http_variable_value_t *v, uintptr_t data)
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412
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110 {
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596
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111 u_char *p, *last;
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112 ngx_str_t val, hash;
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113 time_t expires;
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114 ngx_md5_t md5;
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115 ngx_http_secure_link_ctx_t *ctx;
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412
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116 ngx_http_secure_link_conf_t *conf;
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596
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117 u_char hash_buf[16], md5_buf[16];
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412
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118
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119 conf = ngx_http_get_module_loc_conf(r, ngx_http_secure_link_module);
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120
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596
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121 if (conf->secret.len) {
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122 return ngx_http_secure_link_old_variable(r, conf, v, data);
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123 }
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124
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125 if (conf->variable == NULL || conf->md5 == NULL) {
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126 goto not_found;
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127 }
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128
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129 if (ngx_http_complex_value(r, conf->variable, &val) != NGX_OK) {
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130 return NGX_ERROR;
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131 }
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132
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133 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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134 "secure link: \"%V\"", &val);
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135
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136 last = val.data + val.len;
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137
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138 p = ngx_strlchr(val.data, last, ',');
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139 expires = 0;
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140
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141 if (p) {
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142 val.len = p++ - val.data;
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143
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144 if (conf->expires) {
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145 expires = ngx_atotm(p, last - p);
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146 if (expires <= 0) {
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147 goto not_found;
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148 }
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149
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150 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_secure_link_ctx_t));
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151 if (ctx == NULL) {
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152 return NGX_ERROR;
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153 }
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154
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155 ngx_http_set_ctx(r, ctx, ngx_http_secure_link_module);
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156
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157 ctx->expires.len = last - p;
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158 ctx->expires.data = p;
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159 }
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160 }
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161
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162 if (val.len > 24) {
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412
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163 goto not_found;
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164 }
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165
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596
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166 hash.len = 16;
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167 hash.data = hash_buf;
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168
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169 if (ngx_decode_base64url(&hash, &val) != NGX_OK) {
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170 goto not_found;
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171 }
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172
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173 if (hash.len != 16) {
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174 goto not_found;
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175 }
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176
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177 if (ngx_http_complex_value(r, conf->md5, &val) != NGX_OK) {
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178 return NGX_ERROR;
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179 }
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180
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181 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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182 "secure link md5: \"%V\"", &val);
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183
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184 ngx_md5_init(&md5);
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185 ngx_md5_update(&md5, val.data, val.len);
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186 ngx_md5_final(md5_buf, &md5);
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187
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188 if (ngx_memcmp(hash_buf, md5_buf, 16) != 0) {
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189 goto not_found;
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190 }
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191
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192 v->data = (u_char *) ((expires && expires < ngx_time()) ? "0" : "1");
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193 v->len = 1;
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194 v->valid = 1;
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195 v->no_cacheable = 0;
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196 v->not_found = 0;
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197
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198 return NGX_OK;
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199
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200 not_found:
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201
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202 v->not_found = 1;
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203
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204 return NGX_OK;
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205 }
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206
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207
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208 static ngx_int_t
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209 ngx_http_secure_link_old_variable(ngx_http_request_t *r,
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210 ngx_http_secure_link_conf_t *conf, ngx_http_variable_value_t *v,
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211 uintptr_t data)
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212 {
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213 u_char *p, *start, *end, *last;
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214 size_t len;
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215 ngx_int_t n;
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216 ngx_uint_t i;
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217 ngx_md5_t md5;
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218 u_char hash[16];
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219
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412
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220 p = &r->unparsed_uri.data[1];
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221 last = r->unparsed_uri.data + r->unparsed_uri.len;
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222
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223 while (p < last) {
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224 if (*p++ == '/') {
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225 start = p;
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226 goto md5_start;
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227 }
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228 }
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229
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230 goto not_found;
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231
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232 md5_start:
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233
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234 while (p < last) {
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235 if (*p++ == '/') {
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236 end = p - 1;
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237 goto url_start;
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238 }
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239 }
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240
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241 goto not_found;
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242
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243 url_start:
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244
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245 len = last - p;
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246
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416
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247 if (end - start != 32 || len == 0) {
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412
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248 goto not_found;
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249 }
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250
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251 ngx_md5_init(&md5);
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252 ngx_md5_update(&md5, p, len);
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253 ngx_md5_update(&md5, conf->secret.data, conf->secret.len);
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254 ngx_md5_final(hash, &md5);
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255
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256 for (i = 0; i < 16; i++) {
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257 n = ngx_hextoi(&start[2 * i], 2);
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258 if (n == NGX_ERROR || n != hash[i]) {
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259 goto not_found;
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260 }
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261 }
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262
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263 v->len = len;
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264 v->valid = 1;
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265 v->no_cacheable = 0;
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266 v->not_found = 0;
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267 v->data = p;
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268
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269 return NGX_OK;
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270
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271 not_found:
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272
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273 v->not_found = 1;
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274
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275 return NGX_OK;
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276 }
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277
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278
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596
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279 static ngx_int_t
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280 ngx_http_secure_link_expires_variable(ngx_http_request_t *r,
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281 ngx_http_variable_value_t *v, uintptr_t data)
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282 {
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283 ngx_http_secure_link_ctx_t *ctx;
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284
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285 ctx = ngx_http_get_module_ctx(r, ngx_http_secure_link_module);
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286
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287 if (ctx) {
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288 v->len = ctx->expires.len;
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289 v->valid = 1;
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290 v->no_cacheable = 0;
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291 v->not_found = 0;
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292 v->data = ctx->expires.data;
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293
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294 } else {
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295 v->not_found = 1;
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296 }
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297
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298 return NGX_OK;
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299 }
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300
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301
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412
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302 static void *
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303 ngx_http_secure_link_create_conf(ngx_conf_t *cf)
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304 {
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305 ngx_http_secure_link_conf_t *conf;
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306
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307 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_secure_link_conf_t));
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308 if (conf == NULL) {
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496
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309 return NULL;
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412
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310 }
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311
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312 /*
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313 * set by ngx_pcalloc():
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314 *
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596
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315 * conf->variable = NULL;
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316 * conf->md5 = NULL;
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317 * conf->secret = { 0, NULL };
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412
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318 */
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319
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596
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320 conf->expires = NGX_CONF_UNSET;
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321
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412
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322 return conf;
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323 }
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324
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325
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326 static char *
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327 ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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328 {
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329 ngx_http_secure_link_conf_t *prev = parent;
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330 ngx_http_secure_link_conf_t *conf = child;
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331
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332 ngx_conf_merge_str_value(conf->secret, prev->secret, "");
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333
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596
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334 if (conf->variable == NULL) {
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335 conf->variable = prev->variable;
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336 }
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337
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338 if (conf->md5 == NULL) {
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339 conf->md5 = prev->md5;
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340 }
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341
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342 ngx_conf_merge_value(conf->expires, prev->expires, 0);
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343
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412
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344 return NGX_CONF_OK;
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345 }
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346
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347
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348 static ngx_int_t
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349 ngx_http_secure_link_add_variables(ngx_conf_t *cf)
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350 {
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351 ngx_http_variable_t *var;
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352
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596
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353 var = ngx_http_add_variable(cf, &ngx_http_secure_link_name, 0);
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412
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354 if (var == NULL) {
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355 return NGX_ERROR;
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356 }
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357
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358 var->get_handler = ngx_http_secure_link_variable;
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359
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596
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360 var = ngx_http_add_variable(cf, &ngx_http_secure_link_expires_name, 0);
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361 if (var == NULL) {
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362 return NGX_ERROR;
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363 }
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364
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365 var->get_handler = ngx_http_secure_link_expires_variable;
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366
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412
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367 return NGX_OK;
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368 }
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