126
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_http.h>
|
|
10
|
|
11
|
144
|
12 #define NGX_HTTP_REFERER_NO_URI_PART ((void *) 4)
|
|
13
|
358
|
14 #if !(NGX_PCRE)
|
326
|
15
|
|
16 #define ngx_regex_t void
|
|
17
|
|
18 #endif
|
|
19
|
|
20
|
126
|
21 typedef struct {
|
312
|
22 ngx_hash_combined_t hash;
|
126
|
23
|
326
|
24 #if (NGX_PCRE)
|
|
25 ngx_array_t *regex;
|
|
26 #endif
|
|
27
|
142
|
28 ngx_flag_t no_referer;
|
|
29 ngx_flag_t blocked_referer;
|
126
|
30
|
142
|
31 ngx_hash_keys_arrays_t *keys;
|
126
|
32 } ngx_http_referer_conf_t;
|
|
33
|
|
34
|
|
35 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
|
|
36 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
|
|
37 void *child);
|
|
38 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
39 void *conf);
|
142
|
40 static char *ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
|
144
|
41 ngx_str_t *value, ngx_str_t *uri);
|
326
|
42 static char *ngx_http_add_regex_referer(ngx_conf_t *cf,
|
|
43 ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex);
|
142
|
44 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one,
|
|
45 const void *two);
|
126
|
46
|
|
47
|
|
48 static ngx_command_t ngx_http_referer_commands[] = {
|
|
49
|
|
50 { ngx_string("valid_referers"),
|
|
51 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
|
|
52 ngx_http_valid_referers,
|
|
53 NGX_HTTP_LOC_CONF_OFFSET,
|
|
54 0,
|
|
55 NULL },
|
|
56
|
|
57 ngx_null_command
|
|
58 };
|
|
59
|
|
60
|
|
61 static ngx_http_module_t ngx_http_referer_module_ctx = {
|
|
62 NULL, /* preconfiguration */
|
|
63 NULL, /* postconfiguration */
|
|
64
|
|
65 NULL, /* create main configuration */
|
|
66 NULL, /* init main configuration */
|
|
67
|
|
68 NULL, /* create server configuration */
|
|
69 NULL, /* merge server configuration */
|
|
70
|
|
71 ngx_http_referer_create_conf, /* create location configuration */
|
|
72 ngx_http_referer_merge_conf /* merge location configuration */
|
|
73 };
|
|
74
|
|
75
|
|
76 ngx_module_t ngx_http_referer_module = {
|
|
77 NGX_MODULE_V1,
|
|
78 &ngx_http_referer_module_ctx, /* module context */
|
|
79 ngx_http_referer_commands, /* module directives */
|
|
80 NGX_HTTP_MODULE, /* module type */
|
|
81 NULL, /* init master */
|
|
82 NULL, /* init module */
|
|
83 NULL, /* init process */
|
|
84 NULL, /* init thread */
|
|
85 NULL, /* exit thread */
|
|
86 NULL, /* exit process */
|
|
87 NULL, /* exit master */
|
|
88 NGX_MODULE_V1_PADDING
|
|
89 };
|
|
90
|
|
91
|
|
92 static ngx_int_t
|
|
93 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
|
|
94 uintptr_t data)
|
|
95 {
|
326
|
96 u_char *p, *ref, *last;
|
|
97 size_t len;
|
|
98 ngx_str_t *uri;
|
|
99 ngx_uint_t i, key;
|
|
100 ngx_http_referer_conf_t *rlcf;
|
|
101 u_char buf[256];
|
126
|
102
|
142
|
103 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
|
126
|
104
|
312
|
105 if (rlcf->hash.hash.buckets == NULL
|
|
106 && rlcf->hash.wc_head == NULL
|
326
|
107 && rlcf->hash.wc_tail == NULL
|
|
108 #if (NGX_PCRE)
|
|
109 && rlcf->regex == NULL
|
|
110 #endif
|
|
111 )
|
312
|
112 {
|
144
|
113 goto valid;
|
126
|
114 }
|
|
115
|
|
116 if (r->headers_in.referer == NULL) {
|
142
|
117 if (rlcf->no_referer) {
|
144
|
118 goto valid;
|
|
119 }
|
126
|
120
|
144
|
121 goto invalid;
|
126
|
122 }
|
|
123
|
|
124 len = r->headers_in.referer->value.len;
|
|
125 ref = r->headers_in.referer->value.data;
|
|
126
|
|
127 if (len < sizeof("http://i.ru") - 1
|
286
|
128 || (ngx_strncasecmp(ref, (u_char *) "http://", 7) != 0))
|
126
|
129 {
|
142
|
130 if (rlcf->blocked_referer) {
|
144
|
131 goto valid;
|
|
132 }
|
126
|
133
|
144
|
134 goto invalid;
|
126
|
135 }
|
|
136
|
144
|
137 last = ref + len;
|
126
|
138 ref += 7;
|
144
|
139 i = 0;
|
|
140 key = 0;
|
126
|
141
|
144
|
142 for (p = ref; p < last; p++) {
|
142
|
143 if (*p == '/' || *p == ':') {
|
|
144 break;
|
126
|
145 }
|
144
|
146
|
|
147 buf[i] = ngx_tolower(*p);
|
|
148 key = ngx_hash(key, buf[i++]);
|
|
149
|
|
150 if (i == 256) {
|
|
151 goto invalid;
|
|
152 }
|
142
|
153 }
|
126
|
154
|
326
|
155 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref);
|
126
|
156
|
312
|
157 if (uri) {
|
|
158 goto uri;
|
126
|
159 }
|
|
160
|
326
|
161 #if (NGX_PCRE)
|
|
162
|
|
163 if (rlcf->regex) {
|
358
|
164 ngx_int_t rc;
|
|
165 ngx_str_t referer;
|
326
|
166
|
|
167 referer.len = len - 7;
|
|
168 referer.data = ref;
|
|
169
|
358
|
170 rc = ngx_regex_exec_array(rlcf->regex, &referer, r->connection->log);
|
326
|
171
|
358
|
172 if (rc == NGX_OK) {
|
326
|
173 goto valid;
|
|
174 }
|
358
|
175
|
|
176 if (rc == NGX_ERROR) {
|
|
177 return rc;
|
|
178 }
|
|
179
|
|
180 /* NGX_DECLINED */
|
326
|
181 }
|
|
182
|
|
183 #endif
|
|
184
|
144
|
185 invalid:
|
|
186
|
126
|
187 *v = ngx_http_variable_true_value;
|
|
188
|
|
189 return NGX_OK;
|
144
|
190
|
|
191 uri:
|
|
192
|
|
193 for ( /* void */ ; p < last; p++) {
|
|
194 if (*p == '/') {
|
|
195 break;
|
|
196 }
|
|
197 }
|
|
198
|
|
199 len = last - p;
|
|
200
|
|
201 if (uri == NGX_HTTP_REFERER_NO_URI_PART) {
|
|
202 goto valid;
|
|
203 }
|
|
204
|
|
205 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) {
|
|
206 goto invalid;
|
|
207 }
|
|
208
|
|
209 valid:
|
|
210
|
|
211 *v = ngx_http_variable_null_value;
|
|
212
|
|
213 return NGX_OK;
|
126
|
214 }
|
|
215
|
|
216
|
|
217 static void *
|
|
218 ngx_http_referer_create_conf(ngx_conf_t *cf)
|
|
219 {
|
|
220 ngx_http_referer_conf_t *conf;
|
|
221
|
142
|
222 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t));
|
126
|
223 if (conf == NULL) {
|
|
224 return NGX_CONF_ERROR;
|
|
225 }
|
|
226
|
358
|
227 #if (NGX_PCRE)
|
|
228 conf->regex = NGX_CONF_UNSET_PTR;
|
|
229 #endif
|
|
230
|
126
|
231 conf->no_referer = NGX_CONF_UNSET;
|
|
232 conf->blocked_referer = NGX_CONF_UNSET;
|
|
233
|
|
234 return conf;
|
|
235 }
|
|
236
|
|
237
|
|
238 static char *
|
|
239 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
240 {
|
|
241 ngx_http_referer_conf_t *prev = parent;
|
|
242 ngx_http_referer_conf_t *conf = child;
|
|
243
|
142
|
244 ngx_hash_init_t hash;
|
|
245
|
|
246 if (conf->keys == NULL) {
|
|
247 conf->hash = prev->hash;
|
|
248
|
362
|
249 #if (NGX_PCRE)
|
358
|
250 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
|
362
|
251 #endif
|
126
|
252 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
|
|
253 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
|
142
|
254
|
|
255 return NGX_CONF_OK;
|
|
256 }
|
|
257
|
152
|
258 if ((conf->no_referer == 1 || conf->blocked_referer == 1)
|
312
|
259 && conf->keys->keys.nelts == 0
|
|
260 && conf->keys->dns_wc_head.nelts == 0
|
|
261 && conf->keys->dns_wc_tail.nelts == 0)
|
152
|
262 {
|
|
263 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
|
|
264 "the \"none\" or \"blocked\" referers are specified "
|
|
265 "in the \"valid_referers\" directive "
|
|
266 "without any valid referer");
|
|
267 return NGX_CONF_ERROR;
|
|
268 }
|
|
269
|
142
|
270 hash.key = ngx_hash_key_lc;
|
|
271 hash.max_size = 2048; /* TODO: referer_hash_max_size; */
|
|
272 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */
|
|
273 hash.name = "referers_hash";
|
|
274 hash.pool = cf->pool;
|
|
275
|
|
276 if (conf->keys->keys.nelts) {
|
312
|
277 hash.hash = &conf->hash.hash;
|
142
|
278 hash.temp_pool = NULL;
|
|
279
|
|
280 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts)
|
|
281 != NGX_OK)
|
|
282 {
|
|
283 return NGX_CONF_ERROR;
|
|
284 }
|
|
285 }
|
|
286
|
312
|
287 if (conf->keys->dns_wc_head.nelts) {
|
142
|
288
|
312
|
289 ngx_qsort(conf->keys->dns_wc_head.elts,
|
|
290 (size_t) conf->keys->dns_wc_head.nelts,
|
142
|
291 sizeof(ngx_hash_key_t),
|
|
292 ngx_http_cmp_referer_wildcards);
|
|
293
|
|
294 hash.hash = NULL;
|
|
295 hash.temp_pool = cf->temp_pool;
|
|
296
|
312
|
297 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts,
|
|
298 conf->keys->dns_wc_head.nelts)
|
142
|
299 != NGX_OK)
|
|
300 {
|
|
301 return NGX_CONF_ERROR;
|
|
302 }
|
|
303
|
312
|
304 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash;
|
|
305 }
|
|
306
|
|
307 if (conf->keys->dns_wc_tail.nelts) {
|
|
308
|
|
309 ngx_qsort(conf->keys->dns_wc_tail.elts,
|
|
310 (size_t) conf->keys->dns_wc_tail.nelts,
|
|
311 sizeof(ngx_hash_key_t),
|
|
312 ngx_http_cmp_referer_wildcards);
|
|
313
|
|
314 hash.hash = NULL;
|
|
315 hash.temp_pool = cf->temp_pool;
|
|
316
|
|
317 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts,
|
|
318 conf->keys->dns_wc_tail.nelts)
|
|
319 != NGX_OK)
|
|
320 {
|
|
321 return NGX_CONF_ERROR;
|
|
322 }
|
|
323
|
|
324 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash;
|
126
|
325 }
|
|
326
|
362
|
327 #if (NGX_PCRE)
|
358
|
328 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
|
362
|
329 #endif
|
358
|
330
|
126
|
331 if (conf->no_referer == NGX_CONF_UNSET) {
|
|
332 conf->no_referer = 0;
|
|
333 }
|
|
334
|
|
335 if (conf->blocked_referer == NGX_CONF_UNSET) {
|
|
336 conf->blocked_referer = 0;
|
|
337 }
|
|
338
|
160
|
339 conf->keys = NULL;
|
|
340
|
126
|
341 return NGX_CONF_OK;
|
|
342 }
|
|
343
|
|
344
|
|
345 static char *
|
|
346 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
347 {
|
142
|
348 ngx_http_referer_conf_t *rlcf = conf;
|
126
|
349
|
142
|
350 u_char *p;
|
144
|
351 ngx_str_t *value, uri, name;
|
142
|
352 ngx_uint_t i, n;
|
126
|
353 ngx_http_variable_t *var;
|
|
354 ngx_http_server_name_t *sn;
|
|
355 ngx_http_core_srv_conf_t *cscf;
|
|
356
|
|
357 name.len = sizeof("invalid_referer") - 1;
|
|
358 name.data = (u_char *) "invalid_referer";
|
|
359
|
132
|
360 var = ngx_http_add_variable(cf, &name,
|
340
|
361 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH);
|
126
|
362 if (var == NULL) {
|
|
363 return NGX_CONF_ERROR;
|
|
364 }
|
|
365
|
186
|
366 var->get_handler = ngx_http_referer_variable;
|
126
|
367
|
142
|
368 if (rlcf->keys == NULL) {
|
|
369 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t));
|
|
370 if (rlcf->keys == NULL) {
|
|
371 return NGX_CONF_ERROR;
|
|
372 }
|
126
|
373
|
142
|
374 rlcf->keys->pool = cf->pool;
|
|
375 rlcf->keys->temp_pool = cf->pool;
|
|
376
|
|
377 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) {
|
126
|
378 return NGX_CONF_ERROR;
|
|
379 }
|
|
380 }
|
|
381
|
|
382 value = cf->args->elts;
|
|
383
|
|
384 for (i = 1; i < cf->args->nelts; i++) {
|
|
385 if (value[i].len == 0) {
|
|
386 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
387 "invalid referer \"%V\"", &value[i]);
|
|
388 return NGX_CONF_ERROR;
|
|
389 }
|
|
390
|
|
391 if (ngx_strcmp(value[i].data, "none") == 0) {
|
142
|
392 rlcf->no_referer = 1;
|
126
|
393 continue;
|
|
394 }
|
|
395
|
|
396 if (ngx_strcmp(value[i].data, "blocked") == 0) {
|
142
|
397 rlcf->blocked_referer = 1;
|
126
|
398 continue;
|
|
399 }
|
|
400
|
144
|
401 uri.len = 0;
|
162
|
402 uri.data = NULL;
|
144
|
403
|
126
|
404 if (ngx_strcmp(value[i].data, "server_names") == 0) {
|
142
|
405
|
|
406 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
|
126
|
407
|
142
|
408 sn = cscf->server_names.elts;
|
|
409 for (n = 0; n < cscf->server_names.nelts; n++) {
|
326
|
410
|
|
411 #if (NGX_PCRE)
|
|
412 if (sn[n].regex) {
|
|
413
|
|
414 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name,
|
|
415 sn[n].regex)
|
|
416 != NGX_OK)
|
|
417 {
|
|
418 return NGX_CONF_ERROR;
|
|
419 }
|
|
420
|
|
421 continue;
|
|
422 }
|
|
423 #endif
|
|
424
|
144
|
425 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri)
|
|
426 != NGX_OK)
|
|
427 {
|
142
|
428 return NGX_CONF_ERROR;
|
|
429 }
|
|
430 }
|
126
|
431
|
|
432 continue;
|
|
433 }
|
|
434
|
326
|
435 if (value[i].data[0] == '~') {
|
|
436 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK)
|
|
437 {
|
|
438 return NGX_CONF_ERROR;
|
|
439 }
|
|
440
|
|
441 continue;
|
|
442 }
|
|
443
|
310
|
444 p = (u_char *) ngx_strchr(value[i].data, '/');
|
126
|
445
|
142
|
446 if (p) {
|
144
|
447 uri.len = (value[i].data + value[i].len) - p;
|
|
448 uri.data = p;
|
142
|
449 value[i].len = p - value[i].data;
|
126
|
450 }
|
|
451
|
144
|
452 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) {
|
126
|
453 return NGX_CONF_ERROR;
|
|
454 }
|
|
455 }
|
|
456
|
|
457 return NGX_CONF_OK;
|
|
458 }
|
142
|
459
|
|
460
|
|
461 static char *
|
|
462 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
|
144
|
463 ngx_str_t *value, ngx_str_t *uri)
|
142
|
464 {
|
312
|
465 ngx_int_t rc;
|
|
466 ngx_str_t *u;
|
142
|
467
|
144
|
468 if (uri->len == 0) {
|
|
469 u = NGX_HTTP_REFERER_NO_URI_PART;
|
|
470
|
|
471 } else {
|
|
472 u = ngx_palloc(cf->pool, sizeof(ngx_str_t));
|
|
473 if (u == NULL) {
|
|
474 return NGX_CONF_ERROR;
|
|
475 }
|
|
476
|
|
477 *u = *uri;
|
|
478 }
|
|
479
|
312
|
480 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY);
|
142
|
481
|
|
482 if (rc == NGX_OK) {
|
|
483 return NGX_CONF_OK;
|
|
484 }
|
|
485
|
312
|
486 if (rc == NGX_DECLINED) {
|
|
487 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
488 "invalid hostname or wildcard \"%V\"", value);
|
|
489 }
|
|
490
|
142
|
491 if (rc == NGX_BUSY) {
|
|
492 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
493 "conflicting parameter \"%V\"", value);
|
|
494 }
|
|
495
|
|
496 return NGX_CONF_ERROR;
|
|
497 }
|
|
498
|
|
499
|
326
|
500 static char *
|
|
501 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf,
|
|
502 ngx_str_t *name, ngx_regex_t *regex)
|
|
503 {
|
|
504 #if (NGX_PCRE)
|
358
|
505 ngx_str_t err;
|
|
506 ngx_regex_elt_t *re;
|
|
507 u_char errstr[NGX_MAX_CONF_ERRSTR];
|
326
|
508
|
358
|
509 if (rlcf->regex == NGX_CONF_UNSET_PTR) {
|
|
510 rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t));
|
326
|
511 if (rlcf->regex == NULL) {
|
|
512 return NGX_CONF_ERROR;
|
|
513 }
|
|
514 }
|
|
515
|
358
|
516 re = ngx_array_push(rlcf->regex);
|
|
517 if (re == NULL) {
|
326
|
518 return NGX_CONF_ERROR;
|
|
519 }
|
|
520
|
|
521 if (regex) {
|
358
|
522 re->regex = regex;
|
|
523 re->name = name->data;
|
326
|
524
|
|
525 return NGX_CONF_OK;
|
|
526 }
|
|
527
|
|
528 err.len = NGX_MAX_CONF_ERRSTR;
|
|
529 err.data = errstr;
|
|
530
|
|
531 name->len--;
|
|
532 name->data++;
|
|
533
|
358
|
534 re->regex = ngx_regex_compile(name, NGX_REGEX_CASELESS, cf->pool, &err);
|
326
|
535
|
358
|
536 if (re->regex == NULL) {
|
326
|
537 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data);
|
|
538 return NGX_CONF_ERROR;
|
|
539 }
|
|
540
|
358
|
541 re->name = name->data;
|
326
|
542
|
|
543 return NGX_CONF_OK;
|
|
544
|
|
545 #else
|
|
546
|
|
547 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
548 "the using of the regex \"%V\" requires PCRE library",
|
|
549 name);
|
|
550
|
|
551 return NGX_CONF_ERROR;
|
|
552
|
|
553 #endif
|
|
554 }
|
|
555
|
|
556
|
142
|
557 static int ngx_libc_cdecl
|
|
558 ngx_http_cmp_referer_wildcards(const void *one, const void *two)
|
|
559 {
|
|
560 ngx_hash_key_t *first, *second;
|
|
561
|
|
562 first = (ngx_hash_key_t *) one;
|
|
563 second = (ngx_hash_key_t *) two;
|
|
564
|
|
565 return ngx_strcmp(first->key.data, second->key.data);
|
|
566 }
|