Mercurial > hg > nginx
view src/http/modules/ngx_http_referer_module.c @ 4253:6efec8b1ff52 stable-1.0
Merging r4193, r4194:
Autoindex fixes:
*) Autoindex: escape '?' in file names.
For files with '?' in their names autoindex generated links with '?' not
escaped. This resulted in effectively truncated links as '?' indicates
query string start.
This is an updated version of the patch originally posted at [1]. It
introduces generic NGX_ESCAPE_URI_COMPONENT which escapes everything but
unreserved characters as per RFC 3986. This approach also renders unneeded
special colon processing (as colon is percent-encoded now), it's dropped
accordingly.
[1] http://nginx.org/pipermail/nginx-devel/2010-February/000112.html
*) Autoindex: escape html in file names.
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 01 Nov 2011 14:09:15 +0000 |
parents | 6afb20bf2ad5 |
children | d620f497c50f |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> #define NGX_HTTP_REFERER_NO_URI_PART ((void *) 4) #if !(NGX_PCRE) #define ngx_regex_t void #endif typedef struct { ngx_hash_combined_t hash; #if (NGX_PCRE) ngx_array_t *regex; #endif ngx_flag_t no_referer; ngx_flag_t blocked_referer; ngx_hash_keys_arrays_t *keys; ngx_uint_t referer_hash_max_size; ngx_uint_t referer_hash_bucket_size; } ngx_http_referer_conf_t; static void * ngx_http_referer_create_conf(ngx_conf_t *cf); static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, ngx_str_t *value, ngx_str_t *uri); static char *ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex); static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one, const void *two); static ngx_command_t ngx_http_referer_commands[] = { { ngx_string("valid_referers"), NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, ngx_http_valid_referers, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("referer_hash_max_size"), NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_referer_conf_t, referer_hash_max_size), NULL }, { ngx_string("referer_hash_bucket_size"), NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_referer_conf_t, referer_hash_bucket_size), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_referer_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_referer_create_conf, /* create location configuration */ ngx_http_referer_merge_conf /* merge location configuration */ }; ngx_module_t ngx_http_referer_module = { NGX_MODULE_V1, &ngx_http_referer_module_ctx, /* module context */ ngx_http_referer_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_int_t ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { u_char *p, *ref, *last; size_t len; ngx_str_t *uri; ngx_uint_t i, key; ngx_http_referer_conf_t *rlcf; u_char buf[256]; rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module); if (rlcf->hash.hash.buckets == NULL && rlcf->hash.wc_head == NULL && rlcf->hash.wc_tail == NULL #if (NGX_PCRE) && rlcf->regex == NULL #endif ) { goto valid; } if (r->headers_in.referer == NULL) { if (rlcf->no_referer) { goto valid; } goto invalid; } len = r->headers_in.referer->value.len; ref = r->headers_in.referer->value.data; if (len >= sizeof("http://i.ru") - 1) { last = ref + len; if (ngx_strncasecmp(ref, (u_char *) "http://", 7) == 0) { ref += 7; goto valid_scheme; } else if (ngx_strncasecmp(ref, (u_char *) "https://", 8) == 0) { ref += 8; goto valid_scheme; } } if (rlcf->blocked_referer) { goto valid; } goto invalid; valid_scheme: i = 0; key = 0; for (p = ref; p < last; p++) { if (*p == '/' || *p == ':') { break; } buf[i] = ngx_tolower(*p); key = ngx_hash(key, buf[i++]); if (i == 256) { goto invalid; } } uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref); if (uri) { goto uri; } #if (NGX_PCRE) if (rlcf->regex) { ngx_int_t rc; ngx_str_t referer; referer.len = len - 7; referer.data = ref; rc = ngx_regex_exec_array(rlcf->regex, &referer, r->connection->log); if (rc == NGX_OK) { goto valid; } if (rc == NGX_ERROR) { return rc; } /* NGX_DECLINED */ } #endif invalid: *v = ngx_http_variable_true_value; return NGX_OK; uri: for ( /* void */ ; p < last; p++) { if (*p == '/') { break; } } len = last - p; if (uri == NGX_HTTP_REFERER_NO_URI_PART) { goto valid; } if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) { goto invalid; } valid: *v = ngx_http_variable_null_value; return NGX_OK; } static void * ngx_http_referer_create_conf(ngx_conf_t *cf) { ngx_http_referer_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t)); if (conf == NULL) { return NULL; } #if (NGX_PCRE) conf->regex = NGX_CONF_UNSET_PTR; #endif conf->no_referer = NGX_CONF_UNSET; conf->blocked_referer = NGX_CONF_UNSET; conf->referer_hash_max_size = NGX_CONF_UNSET_UINT; conf->referer_hash_bucket_size = NGX_CONF_UNSET_UINT; return conf; } static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_referer_conf_t *prev = parent; ngx_http_referer_conf_t *conf = child; ngx_hash_init_t hash; if (conf->keys == NULL) { conf->hash = prev->hash; #if (NGX_PCRE) ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL); #endif ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0); ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0); ngx_conf_merge_uint_value(conf->referer_hash_max_size, prev->referer_hash_max_size, 2048); ngx_conf_merge_uint_value(conf->referer_hash_bucket_size, prev->referer_hash_bucket_size, 64); return NGX_CONF_OK; } if ((conf->no_referer == 1 || conf->blocked_referer == 1) && conf->keys->keys.nelts == 0 && conf->keys->dns_wc_head.nelts == 0 && conf->keys->dns_wc_tail.nelts == 0) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "the \"none\" or \"blocked\" referers are specified " "in the \"valid_referers\" directive " "without any valid referer"); return NGX_CONF_ERROR; } ngx_conf_merge_uint_value(conf->referer_hash_max_size, prev->referer_hash_max_size, 2048); ngx_conf_merge_uint_value(conf->referer_hash_bucket_size, prev->referer_hash_bucket_size, 64); conf->referer_hash_bucket_size = ngx_align(conf->referer_hash_bucket_size, ngx_cacheline_size); hash.key = ngx_hash_key_lc; hash.max_size = conf->referer_hash_max_size; hash.bucket_size = conf->referer_hash_bucket_size; hash.name = "referer_hash"; hash.pool = cf->pool; if (conf->keys->keys.nelts) { hash.hash = &conf->hash.hash; hash.temp_pool = NULL; if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts) != NGX_OK) { return NGX_CONF_ERROR; } } if (conf->keys->dns_wc_head.nelts) { ngx_qsort(conf->keys->dns_wc_head.elts, (size_t) conf->keys->dns_wc_head.nelts, sizeof(ngx_hash_key_t), ngx_http_cmp_referer_wildcards); hash.hash = NULL; hash.temp_pool = cf->temp_pool; if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts, conf->keys->dns_wc_head.nelts) != NGX_OK) { return NGX_CONF_ERROR; } conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; } if (conf->keys->dns_wc_tail.nelts) { ngx_qsort(conf->keys->dns_wc_tail.elts, (size_t) conf->keys->dns_wc_tail.nelts, sizeof(ngx_hash_key_t), ngx_http_cmp_referer_wildcards); hash.hash = NULL; hash.temp_pool = cf->temp_pool; if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts, conf->keys->dns_wc_tail.nelts) != NGX_OK) { return NGX_CONF_ERROR; } conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash; } #if (NGX_PCRE) ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL); #endif if (conf->no_referer == NGX_CONF_UNSET) { conf->no_referer = 0; } if (conf->blocked_referer == NGX_CONF_UNSET) { conf->blocked_referer = 0; } conf->keys = NULL; return NGX_CONF_OK; } static char * ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_referer_conf_t *rlcf = conf; u_char *p; ngx_str_t *value, uri, name; ngx_uint_t i, n; ngx_http_variable_t *var; ngx_http_server_name_t *sn; ngx_http_core_srv_conf_t *cscf; ngx_str_set(&name, "invalid_referer"); var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH); if (var == NULL) { return NGX_CONF_ERROR; } var->get_handler = ngx_http_referer_variable; if (rlcf->keys == NULL) { rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t)); if (rlcf->keys == NULL) { return NGX_CONF_ERROR; } rlcf->keys->pool = cf->pool; rlcf->keys->temp_pool = cf->pool; if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) { return NGX_CONF_ERROR; } } value = cf->args->elts; for (i = 1; i < cf->args->nelts; i++) { if (value[i].len == 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid referer \"%V\"", &value[i]); return NGX_CONF_ERROR; } if (ngx_strcmp(value[i].data, "none") == 0) { rlcf->no_referer = 1; continue; } if (ngx_strcmp(value[i].data, "blocked") == 0) { rlcf->blocked_referer = 1; continue; } ngx_str_null(&uri); if (ngx_strcmp(value[i].data, "server_names") == 0) { cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module); sn = cscf->server_names.elts; for (n = 0; n < cscf->server_names.nelts; n++) { #if (NGX_PCRE) if (sn[n].regex) { if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name, sn[n].regex->regex) != NGX_OK) { return NGX_CONF_ERROR; } continue; } #endif if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri) != NGX_OK) { return NGX_CONF_ERROR; } } continue; } if (value[i].data[0] == '~') { if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK) { return NGX_CONF_ERROR; } continue; } p = (u_char *) ngx_strchr(value[i].data, '/'); if (p) { uri.len = (value[i].data + value[i].len) - p; uri.data = p; value[i].len = p - value[i].data; } if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) { return NGX_CONF_ERROR; } } return NGX_CONF_OK; } static char * ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, ngx_str_t *value, ngx_str_t *uri) { ngx_int_t rc; ngx_str_t *u; if (uri->len == 0) { u = NGX_HTTP_REFERER_NO_URI_PART; } else { u = ngx_palloc(cf->pool, sizeof(ngx_str_t)); if (u == NULL) { return NGX_CONF_ERROR; } *u = *uri; } rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY); if (rc == NGX_OK) { return NGX_CONF_OK; } if (rc == NGX_DECLINED) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid hostname or wildcard \"%V\"", value); } if (rc == NGX_BUSY) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "conflicting parameter \"%V\"", value); } return NGX_CONF_ERROR; } static char * ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex) { #if (NGX_PCRE) ngx_regex_elt_t *re; ngx_regex_compile_t rc; u_char errstr[NGX_MAX_CONF_ERRSTR]; if (name->len == 1) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "empty regex in \"%V\"", name); return NGX_CONF_ERROR; } if (rlcf->regex == NGX_CONF_UNSET_PTR) { rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t)); if (rlcf->regex == NULL) { return NGX_CONF_ERROR; } } re = ngx_array_push(rlcf->regex); if (re == NULL) { return NGX_CONF_ERROR; } if (regex) { re->regex = regex; re->name = name->data; return NGX_CONF_OK; } name->len--; name->data++; ngx_memzero(&rc, sizeof(ngx_regex_compile_t)); rc.pattern = *name; rc.pool = cf->pool; rc.options = NGX_REGEX_CASELESS; rc.err.len = NGX_MAX_CONF_ERRSTR; rc.err.data = errstr; if (ngx_regex_compile(&rc) != NGX_OK) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err); return NGX_CONF_ERROR; } re->regex = rc.regex; re->name = name->data; return NGX_CONF_OK; #else ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "the using of the regex \"%V\" requires PCRE library", name); return NGX_CONF_ERROR; #endif } static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one, const void *two) { ngx_hash_key_t *first, *second; first = (ngx_hash_key_t *) one; second = (ngx_hash_key_t *) two; return ngx_dns_strcmp(first->key.data, second->key.data); }