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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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660
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4 * Copyright (C) Nginx, Inc.
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412
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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 #include <ngx_md5.h>
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12
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13
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14 typedef struct {
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596
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15 ngx_http_complex_value_t *variable;
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16 ngx_http_complex_value_t *md5;
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17 ngx_str_t secret;
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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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598
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41 ngx_http_set_complex_value_slot,
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596
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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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598
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48 ngx_http_set_complex_value_slot,
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596
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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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412
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53 { ngx_string("secure_link_secret"),
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54 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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55 ngx_conf_set_str_slot,
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56 NGX_HTTP_LOC_CONF_OFFSET,
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57 offsetof(ngx_http_secure_link_conf_t, secret),
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58 NULL },
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59
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60 ngx_null_command
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61 };
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62
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63
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64 static ngx_http_module_t ngx_http_secure_link_module_ctx = {
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65 ngx_http_secure_link_add_variables, /* preconfiguration */
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66 NULL, /* postconfiguration */
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67
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68 NULL, /* create main configuration */
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69 NULL, /* init main configuration */
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70
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71 NULL, /* create server configuration */
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72 NULL, /* merge server configuration */
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73
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74 ngx_http_secure_link_create_conf, /* create location configuration */
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75 ngx_http_secure_link_merge_conf /* merge location configuration */
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76 };
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77
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78
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79 ngx_module_t ngx_http_secure_link_module = {
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80 NGX_MODULE_V1,
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81 &ngx_http_secure_link_module_ctx, /* module context */
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82 ngx_http_secure_link_commands, /* module directives */
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83 NGX_HTTP_MODULE, /* module type */
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84 NULL, /* init master */
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85 NULL, /* init module */
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86 NULL, /* init process */
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87 NULL, /* init thread */
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88 NULL, /* exit thread */
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89 NULL, /* exit process */
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90 NULL, /* exit master */
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91 NGX_MODULE_V1_PADDING
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92 };
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93
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94
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596
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95 static ngx_str_t ngx_http_secure_link_name = ngx_string("secure_link");
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96 static ngx_str_t ngx_http_secure_link_expires_name =
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97 ngx_string("secure_link_expires");
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412
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98
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99
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100 static ngx_int_t
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101 ngx_http_secure_link_variable(ngx_http_request_t *r,
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596
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102 ngx_http_variable_value_t *v, uintptr_t data)
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412
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103 {
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596
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104 u_char *p, *last;
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105 ngx_str_t val, hash;
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106 time_t expires;
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107 ngx_md5_t md5;
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108 ngx_http_secure_link_ctx_t *ctx;
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412
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109 ngx_http_secure_link_conf_t *conf;
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596
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110 u_char hash_buf[16], md5_buf[16];
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412
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111
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112 conf = ngx_http_get_module_loc_conf(r, ngx_http_secure_link_module);
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113
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596
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114 if (conf->secret.len) {
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115 return ngx_http_secure_link_old_variable(r, conf, v, data);
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116 }
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117
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118 if (conf->variable == NULL || conf->md5 == NULL) {
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119 goto not_found;
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120 }
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121
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122 if (ngx_http_complex_value(r, conf->variable, &val) != NGX_OK) {
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123 return NGX_ERROR;
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124 }
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125
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126 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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127 "secure link: \"%V\"", &val);
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128
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129 last = val.data + val.len;
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130
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131 p = ngx_strlchr(val.data, last, ',');
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132 expires = 0;
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133
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134 if (p) {
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135 val.len = p++ - val.data;
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136
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598
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137 expires = ngx_atotm(p, last - p);
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138 if (expires <= 0) {
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139 goto not_found;
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140 }
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596
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141
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598
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142 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_secure_link_ctx_t));
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143 if (ctx == NULL) {
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144 return NGX_ERROR;
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145 }
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596
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146
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598
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147 ngx_http_set_ctx(r, ctx, ngx_http_secure_link_module);
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596
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148
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598
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149 ctx->expires.len = last - p;
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150 ctx->expires.data = p;
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596
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151 }
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152
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153 if (val.len > 24) {
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412
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154 goto not_found;
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155 }
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156
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596
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157 hash.len = 16;
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158 hash.data = hash_buf;
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159
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160 if (ngx_decode_base64url(&hash, &val) != NGX_OK) {
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161 goto not_found;
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162 }
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163
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164 if (hash.len != 16) {
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165 goto not_found;
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166 }
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167
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168 if (ngx_http_complex_value(r, conf->md5, &val) != NGX_OK) {
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169 return NGX_ERROR;
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170 }
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171
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172 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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173 "secure link md5: \"%V\"", &val);
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174
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175 ngx_md5_init(&md5);
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176 ngx_md5_update(&md5, val.data, val.len);
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177 ngx_md5_final(md5_buf, &md5);
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178
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179 if (ngx_memcmp(hash_buf, md5_buf, 16) != 0) {
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180 goto not_found;
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181 }
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182
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183 v->data = (u_char *) ((expires && expires < ngx_time()) ? "0" : "1");
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184 v->len = 1;
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185 v->valid = 1;
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186 v->no_cacheable = 0;
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187 v->not_found = 0;
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188
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189 return NGX_OK;
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190
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191 not_found:
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192
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193 v->not_found = 1;
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194
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195 return NGX_OK;
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196 }
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197
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198
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199 static ngx_int_t
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200 ngx_http_secure_link_old_variable(ngx_http_request_t *r,
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201 ngx_http_secure_link_conf_t *conf, ngx_http_variable_value_t *v,
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202 uintptr_t data)
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203 {
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204 u_char *p, *start, *end, *last;
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205 size_t len;
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206 ngx_int_t n;
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207 ngx_uint_t i;
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208 ngx_md5_t md5;
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209 u_char hash[16];
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210
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412
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211 p = &r->unparsed_uri.data[1];
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212 last = r->unparsed_uri.data + r->unparsed_uri.len;
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213
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214 while (p < last) {
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215 if (*p++ == '/') {
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216 start = p;
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217 goto md5_start;
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218 }
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219 }
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220
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221 goto not_found;
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222
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223 md5_start:
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224
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225 while (p < last) {
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226 if (*p++ == '/') {
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227 end = p - 1;
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228 goto url_start;
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229 }
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230 }
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231
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232 goto not_found;
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233
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234 url_start:
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235
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236 len = last - p;
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237
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416
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238 if (end - start != 32 || len == 0) {
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412
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239 goto not_found;
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240 }
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241
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242 ngx_md5_init(&md5);
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243 ngx_md5_update(&md5, p, len);
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244 ngx_md5_update(&md5, conf->secret.data, conf->secret.len);
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245 ngx_md5_final(hash, &md5);
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246
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247 for (i = 0; i < 16; i++) {
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248 n = ngx_hextoi(&start[2 * i], 2);
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249 if (n == NGX_ERROR || n != hash[i]) {
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250 goto not_found;
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251 }
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252 }
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253
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254 v->len = len;
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255 v->valid = 1;
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256 v->no_cacheable = 0;
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257 v->not_found = 0;
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258 v->data = p;
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259
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260 return NGX_OK;
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261
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262 not_found:
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263
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264 v->not_found = 1;
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265
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266 return NGX_OK;
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267 }
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268
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269
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596
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270 static ngx_int_t
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271 ngx_http_secure_link_expires_variable(ngx_http_request_t *r,
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272 ngx_http_variable_value_t *v, uintptr_t data)
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273 {
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274 ngx_http_secure_link_ctx_t *ctx;
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275
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276 ctx = ngx_http_get_module_ctx(r, ngx_http_secure_link_module);
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277
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278 if (ctx) {
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279 v->len = ctx->expires.len;
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280 v->valid = 1;
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281 v->no_cacheable = 0;
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282 v->not_found = 0;
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283 v->data = ctx->expires.data;
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284
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285 } else {
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286 v->not_found = 1;
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287 }
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288
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289 return NGX_OK;
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290 }
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291
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292
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412
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293 static void *
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294 ngx_http_secure_link_create_conf(ngx_conf_t *cf)
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295 {
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296 ngx_http_secure_link_conf_t *conf;
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297
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298 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_secure_link_conf_t));
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299 if (conf == NULL) {
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496
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300 return NULL;
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412
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301 }
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302
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303 /*
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304 * set by ngx_pcalloc():
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305 *
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596
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306 * conf->variable = NULL;
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307 * conf->md5 = NULL;
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308 * conf->secret = { 0, NULL };
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412
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309 */
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310
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311 return conf;
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312 }
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313
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314
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315 static char *
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316 ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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317 {
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318 ngx_http_secure_link_conf_t *prev = parent;
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319 ngx_http_secure_link_conf_t *conf = child;
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320
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321 ngx_conf_merge_str_value(conf->secret, prev->secret, "");
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322
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596
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323 if (conf->variable == NULL) {
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324 conf->variable = prev->variable;
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325 }
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326
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327 if (conf->md5 == NULL) {
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328 conf->md5 = prev->md5;
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329 }
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330
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412
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331 return NGX_CONF_OK;
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332 }
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333
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334
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335 static ngx_int_t
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336 ngx_http_secure_link_add_variables(ngx_conf_t *cf)
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337 {
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338 ngx_http_variable_t *var;
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339
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596
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340 var = ngx_http_add_variable(cf, &ngx_http_secure_link_name, 0);
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412
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341 if (var == NULL) {
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342 return NGX_ERROR;
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343 }
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344
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345 var->get_handler = ngx_http_secure_link_variable;
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346
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596
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347 var = ngx_http_add_variable(cf, &ngx_http_secure_link_expires_name, 0);
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348 if (var == NULL) {
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349 return NGX_ERROR;
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350 }
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351
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352 var->get_handler = ngx_http_secure_link_expires_variable;
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353
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412
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354 return NGX_OK;
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355 }
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