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Diffstat (limited to '')
| -rw-r--r-- | server/request.c | 2572 |
1 files changed, 2572 insertions, 0 deletions
diff --git a/server/request.c b/server/request.c new file mode 100644 index 0000000..5599b2c --- /dev/null +++ b/server/request.c @@ -0,0 +1,2572 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* + * @file request.c + * @brief functions to get and process requests + * + * @author Rob McCool 3/21/93 + * + * Thoroughly revamped by rst for Apache. NB this file reads + * best from the bottom up. + * + */ + +#include "apr_strings.h" +#include "apr_file_io.h" +#include "apr_fnmatch.h" + +#define APR_WANT_STRFUNC +#include "apr_want.h" + +#include "ap_config.h" +#include "ap_provider.h" +#include "httpd.h" +#include "http_config.h" +#include "http_request.h" +#include "http_core.h" +#include "http_protocol.h" +#include "http_log.h" +#include "http_main.h" +#include "util_filter.h" +#include "util_charset.h" +#include "util_script.h" +#include "ap_expr.h" +#include "mod_request.h" + +#include "mod_core.h" +#include "mod_auth.h" + +#if APR_HAVE_STDARG_H +#include <stdarg.h> +#endif + +/* we know core's module_index is 0 */ +#undef APLOG_MODULE_INDEX +#define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX + +APR_HOOK_STRUCT( + APR_HOOK_LINK(pre_translate_name) + APR_HOOK_LINK(translate_name) + APR_HOOK_LINK(map_to_storage) + APR_HOOK_LINK(check_user_id) + APR_HOOK_LINK(fixups) + APR_HOOK_LINK(type_checker) + APR_HOOK_LINK(access_checker) + APR_HOOK_LINK(access_checker_ex) + APR_HOOK_LINK(auth_checker) + APR_HOOK_LINK(insert_filter) + APR_HOOK_LINK(create_request) + APR_HOOK_LINK(post_perdir_config) + APR_HOOK_LINK(dirwalk_stat) + APR_HOOK_LINK(force_authn) +) + +AP_IMPLEMENT_HOOK_RUN_FIRST(int,pre_translate_name, + (request_rec *r), (r), DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,translate_name, + (request_rec *r), (r), DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,map_to_storage, + (request_rec *r), (r), DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,check_user_id, + (request_rec *r), (r), DECLINED) +AP_IMPLEMENT_HOOK_RUN_ALL(int,fixups, + (request_rec *r), (r), OK, DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,type_checker, + (request_rec *r), (r), DECLINED) +AP_IMPLEMENT_HOOK_RUN_ALL(int,access_checker, + (request_rec *r), (r), OK, DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,access_checker_ex, + (request_rec *r), (r), DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,auth_checker, + (request_rec *r), (r), DECLINED) +AP_IMPLEMENT_HOOK_VOID(insert_filter, (request_rec *r), (r)) +AP_IMPLEMENT_HOOK_RUN_ALL(int, create_request, + (request_rec *r), (r), OK, DECLINED) +AP_IMPLEMENT_HOOK_RUN_ALL(int, post_perdir_config, + (request_rec *r), (r), OK, DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(apr_status_t,dirwalk_stat, + (apr_finfo_t *finfo, request_rec *r, apr_int32_t wanted), + (finfo, r, wanted), AP_DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,force_authn, + (request_rec *r), (r), DECLINED) + +static int auth_internal_per_conf = 0; +static int auth_internal_per_conf_hooks = 0; +static int auth_internal_per_conf_providers = 0; + + +static int decl_die(int status, const char *phase, request_rec *r) +{ + if (status == DECLINED) { + ap_log_rerror(APLOG_MARK, APLOG_CRIT, 0, r, APLOGNO(00025) + "configuration error: couldn't %s: %s", phase, r->uri); + return HTTP_INTERNAL_SERVER_ERROR; + } + else { + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, + "auth phase '%s' gave status %d: %s", phase, + status, r->uri); + return status; + } +} + +AP_DECLARE(int) ap_some_authn_required(request_rec *r) +{ + int access_status; + char *olduser = r->user; + int rv = FALSE; + + switch (ap_satisfies(r)) { + case SATISFY_ALL: + case SATISFY_NOSPEC: + if ((access_status = ap_run_access_checker(r)) != OK) { + break; + } + + access_status = ap_run_access_checker_ex(r); + if (access_status == DECLINED) { + rv = TRUE; + } + + break; + case SATISFY_ANY: + if ((access_status = ap_run_access_checker(r)) == OK) { + break; + } + + access_status = ap_run_access_checker_ex(r); + if (access_status == DECLINED) { + rv = TRUE; + } + + break; + } + + r->user = olduser; + return rv; +} + +static int walk_location_and_if(request_rec *r) +{ + int access_status; + core_dir_config *d; + + if ((access_status = ap_location_walk(r))) { + return access_status; + } + if ((access_status = ap_if_walk(r))) { + return access_status; + } + + d = ap_get_core_module_config(r->per_dir_config); + if (d->log) + r->log = d->log; + + return OK; +} + +/* This is the master logic for processing requests. Do NOT duplicate + * this logic elsewhere, or the security model will be broken by future + * API changes. Each phase must be individually optimized to pick up + * redundant/duplicate calls by subrequests, and redirects. + */ +AP_DECLARE(int) ap_process_request_internal(request_rec *r) +{ + int access_status = DECLINED; + int file_req = (r->main && r->filename); + core_server_config *sconf = + ap_get_core_module_config(r->server->module_config); + unsigned int normalize_flags; + + normalize_flags = AP_NORMALIZE_NOT_ABOVE_ROOT; + if (sconf->merge_slashes != AP_CORE_CONFIG_OFF) { + normalize_flags |= AP_NORMALIZE_MERGE_SLASHES; + } + if (file_req) { + /* File subrequests can have a relative path. */ + normalize_flags |= AP_NORMALIZE_ALLOW_RELATIVE; + } + + if (r->parsed_uri.path) { + /* Normalize: remove /./ and shrink /../ segments, plus + * decode unreserved chars (first time only to avoid + * double decoding after ap_unescape_url() below). + */ + if (!ap_normalize_path(r->parsed_uri.path, + normalize_flags | + AP_NORMALIZE_DECODE_UNRESERVED)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10244) + "invalid URI path (%s)", r->unparsed_uri); + return HTTP_BAD_REQUEST; + } + } + + /* All file subrequests are a huge pain... they cannot bubble through the + * next several steps. Only file subrequests are allowed an empty uri, + * otherwise let (pre_)translate_name kill the request. + */ + if (!file_req) { + ap_conf_vector_t *per_dir_config = r->per_dir_config; + + if ((access_status = walk_location_and_if(r))) { + return access_status; + } + + /* Let pre_translate_name hooks work with non-decoded URIs, and + * eventually prevent further URI transformations (return DONE). + */ + access_status = ap_run_pre_translate_name(r); + if (ap_is_HTTP_ERROR(access_status)) { + return access_status; + } + + /* Throw away pre_trans only merging */ + r->per_dir_config = per_dir_config; + } + + /* Ignore URL unescaping for translated URIs already */ + if (access_status != DONE && r->parsed_uri.path) { + core_dir_config *d = ap_get_core_module_config(r->per_dir_config); + /* Unreserved chars were already decoded by ap_normalize_path() */ + unsigned int unescape_flags = AP_UNESCAPE_URL_KEEP_UNRESERVED; + if (!d->allow_encoded_slashes) { + unescape_flags |= AP_UNESCAPE_URL_FORBID_SLASHES; + } + else if (!d->decode_encoded_slashes) { + unescape_flags |= AP_UNESCAPE_URL_KEEP_SLASHES; + } + access_status = ap_unescape_url_ex(r->parsed_uri.path, unescape_flags); + if (access_status) { + if (access_status == HTTP_NOT_FOUND) { + if (! d->allow_encoded_slashes) { + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00026) + "found %%2f (encoded '/') in URI path (%s), " + "returning 404", r->unparsed_uri); + } + } + return access_status; + } + + if (d->allow_encoded_slashes && d->decode_encoded_slashes) { + /* Decoding slashes might have created new // or /./ or /../ + * segments (e.g. "/.%2F/"), so re-normalize. + */ + ap_normalize_path(r->parsed_uri.path, normalize_flags); + } + } + + /* Same, translate_name is not suited for file subrequests */ + if (!file_req) { + if ((access_status = walk_location_and_if(r))) { + return access_status; + } + + if ((access_status = ap_run_translate_name(r))) { + return decl_die(access_status, "translate", r); + } + } + + /* Reset to the server default config prior to running map_to_storage + */ + r->per_dir_config = r->server->lookup_defaults; + + if ((access_status = ap_run_map_to_storage(r))) { + /* This request wasn't in storage (e.g. TRACE) */ + return access_status; + } + + /* Rerun the location walk, which overrides any map_to_storage config. + */ + if ((access_status = walk_location_and_if(r))) { + return access_status; + } + + if ((access_status = ap_run_post_perdir_config(r))) { + return access_status; + } + + /* Only on the main request! */ + if (r->main == NULL) { + if ((access_status = ap_run_header_parser(r))) { + return access_status; + } + } + + /* Skip authn/authz if the parent or prior request passed the authn/authz, + * and that configuration didn't change (this requires optimized _walk() + * functions in map_to_storage that use the same merge results given + * identical input.) If the config changes, we must re-auth. + */ + if (r->prev && (r->prev->per_dir_config == r->per_dir_config)) { + r->user = r->prev->user; + r->ap_auth_type = r->prev->ap_auth_type; + } + else if (r->main && (r->main->per_dir_config == r->per_dir_config)) { + r->user = r->main->user; + r->ap_auth_type = r->main->ap_auth_type; + } + else { + /* A module using a confusing API (ap_get_basic_auth_pw) caused + ** r->user to be filled out prior to check_authn hook. We treat + ** it is inadvertent. + */ + if (r->user && apr_table_get(r->notes, AP_GET_BASIC_AUTH_PW_NOTE)) { + r->user = NULL; + } + + switch (ap_satisfies(r)) { + case SATISFY_ALL: + case SATISFY_NOSPEC: + if ((access_status = ap_run_access_checker(r)) != OK) { + return decl_die(access_status, + "check access (with Satisfy All)", r); + } + + access_status = ap_run_access_checker_ex(r); + if (access_status == DECLINED + || (access_status == OK && ap_run_force_authn(r) == OK)) { + if ((access_status = ap_run_check_user_id(r)) != OK) { + return decl_die(access_status, "check user", r); + } + if (r->user == NULL) { + /* don't let buggy authn module crash us in authz */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00027) + "No authentication done but request not " + "allowed without authentication for %s. " + "Authentication not configured?", + r->uri); + access_status = HTTP_INTERNAL_SERVER_ERROR; + return decl_die(access_status, "check user", r); + } + if ((access_status = ap_run_auth_checker(r)) != OK) { + return decl_die(access_status, "check authorization", r); + } + } + else if (access_status == OK) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, + "request authorized without authentication by " + "access_checker_ex hook: %s", r->uri); + } + else { + return decl_die(access_status, "check access", r); + } + break; + case SATISFY_ANY: + if ((access_status = ap_run_access_checker(r)) == OK) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, + "request authorized without authentication by " + "access_checker hook and 'Satisfy any': %s", + r->uri); + break; + } + + access_status = ap_run_access_checker_ex(r); + if (access_status == DECLINED + || (access_status == OK && ap_run_force_authn(r) == OK)) { + if ((access_status = ap_run_check_user_id(r)) != OK) { + return decl_die(access_status, "check user", r); + } + if (r->user == NULL) { + /* don't let buggy authn module crash us in authz */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00028) + "No authentication done but request not " + "allowed without authentication for %s. " + "Authentication not configured?", + r->uri); + access_status = HTTP_INTERNAL_SERVER_ERROR; + return decl_die(access_status, "check user", r); + } + if ((access_status = ap_run_auth_checker(r)) != OK) { + return decl_die(access_status, "check authorization", r); + } + } + else if (access_status == OK) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, + "request authorized without authentication by " + "access_checker_ex hook: %s", r->uri); + } + else { + return decl_die(access_status, "check access", r); + } + break; + } + } + /* XXX Must make certain the ap_run_type_checker short circuits mime + * in mod-proxy for r->proxyreq && r->parsed_uri.scheme + * && !strcmp(r->parsed_uri.scheme, "http") + */ + if ((access_status = ap_run_type_checker(r)) != OK) { + return decl_die(access_status, "find types", r); + } + + if ((access_status = ap_run_fixups(r)) != OK) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, "fixups hook gave %d: %s", + access_status, r->uri); + return access_status; + } + + return OK; +} + + +/* Useful caching structures to repeat _walk/merge sequences as required + * when a subrequest or redirect reuses substantially the same config. + * + * Directive order in the httpd.conf file and its Includes significantly + * impact this optimization. Grouping common blocks at the front of the + * config that are less likely to change between a request and + * its subrequests, or between a request and its redirects reduced + * the work of these functions significantly. + */ + +typedef struct walk_walked_t { + ap_conf_vector_t *matched; /* A dir_conf sections we matched */ + ap_conf_vector_t *merged; /* The dir_conf merged result */ +} walk_walked_t; + +typedef struct walk_cache_t { + const char *cached; /* The identifier we matched */ + ap_conf_vector_t **dir_conf_tested; /* The sections we matched against */ + ap_conf_vector_t *dir_conf_merged; /* Base per_dir_config */ + ap_conf_vector_t *per_dir_result; /* per_dir_config += walked result */ + apr_array_header_t *walked; /* The list of walk_walked_t results */ + struct walk_cache_t *prev; /* Prev cache of same call in this (sub)req */ + int count; /* Number of prev invocations of same call in this (sub)req */ +} walk_cache_t; + +static walk_cache_t *prep_walk_cache(apr_size_t t, request_rec *r) +{ + void **note, **inherit_note; + walk_cache_t *cache, *prev_cache, *copy_cache; + int count; + + /* Find the most relevant, recent walk cache to work from and provide + * a copy the caller is allowed to munge. In the case of a sub-request + * or internal redirect, this is the cache corresponding to the equivalent + * invocation of the same function call in the "parent" request, if such + * a cache exists. Otherwise it is the walk cache of the previous + * invocation of the same function call in the current request, if + * that exists; if not, then create a new walk cache. + */ + note = ap_get_request_note(r, t); + AP_DEBUG_ASSERT(note != NULL); + + copy_cache = prev_cache = *note; + count = prev_cache ? (prev_cache->count + 1) : 0; + + if ((r->prev + && (inherit_note = ap_get_request_note(r->prev, t)) + && *inherit_note) + || (r->main + && (inherit_note = ap_get_request_note(r->main, t)) + && *inherit_note)) { + walk_cache_t *inherit_cache = *inherit_note; + + while (inherit_cache->count > count) { + inherit_cache = inherit_cache->prev; + } + if (inherit_cache->count == count) { + copy_cache = inherit_cache; + } + } + + if (copy_cache) { + cache = apr_pmemdup(r->pool, copy_cache, sizeof(*cache)); + cache->walked = apr_array_copy(r->pool, cache->walked); + cache->prev = prev_cache; + cache->count = count; + } + else { + cache = apr_pcalloc(r->pool, sizeof(*cache)); + cache->walked = apr_array_make(r->pool, 4, sizeof(walk_walked_t)); + } + + *note = cache; + + return cache; +} + +/***************************************************************** + * + * Getting and checking directory configuration. Also checks the + * FollowSymlinks and FollowSymOwner stuff, since this is really the + * only place that can happen (barring a new mid_dir_walk callout). + * + * We can't do it as an access_checker module function which gets + * called with the final per_dir_config, since we could have a directory + * with FollowSymLinks disabled, which contains a symlink to another + * with a .htaccess file which turns FollowSymLinks back on --- and + * access in such a case must be denied. So, whatever it is that + * checks FollowSymLinks needs to know the state of the options as + * they change, all the way down. + */ + + +/* + * resolve_symlink must _always_ be called on an APR_LNK file type! + * It will resolve the actual target file type, modification date, etc, + * and provide any processing required for symlink evaluation. + * Path must already be cleaned, no trailing slash, no multi-slashes, + * and don't call this on the root! + * + * Simply, the number of times we deref a symlink are minimal compared + * to the number of times we had an extra lstat() since we 'weren't sure'. + * + * To optimize, we stat() anything when given (opts & OPT_SYM_LINKS), otherwise + * we start off with an lstat(). Every lstat() must be dereferenced in case + * it points at a 'nasty' - we must always rerun check_safe_file (or similar.) + */ +static int resolve_symlink(char *d, apr_finfo_t *lfi, int opts, apr_pool_t *p) +{ + apr_finfo_t fi; + const char *savename; + + if (!(opts & (OPT_SYM_OWNER | OPT_SYM_LINKS))) { + return HTTP_FORBIDDEN; + } + + /* Save the name from the valid bits. */ + savename = (lfi->valid & APR_FINFO_NAME) ? lfi->name : NULL; + + /* if OPT_SYM_OWNER is unset, we only need to check target accessible */ + if (!(opts & OPT_SYM_OWNER)) { + if (apr_stat(&fi, d, lfi->valid & ~(APR_FINFO_NAME | APR_FINFO_LINK), p) + != APR_SUCCESS) + { + return HTTP_FORBIDDEN; + } + + /* Give back the target */ + memcpy(lfi, &fi, sizeof(fi)); + if (savename) { + lfi->name = savename; + lfi->valid |= APR_FINFO_NAME; + } + + return OK; + } + + /* OPT_SYM_OWNER only works if we can get the owner of + * both the file and symlink. First fill in a missing + * owner of the symlink, then get the info of the target. + */ + if (!(lfi->valid & APR_FINFO_OWNER)) { + if (apr_stat(lfi, d, lfi->valid | APR_FINFO_LINK | APR_FINFO_OWNER, p) + != APR_SUCCESS) + { + return HTTP_FORBIDDEN; + } + } + + if (apr_stat(&fi, d, lfi->valid & ~(APR_FINFO_NAME), p) != APR_SUCCESS) { + return HTTP_FORBIDDEN; + } + + if (apr_uid_compare(fi.user, lfi->user) != APR_SUCCESS) { + return HTTP_FORBIDDEN; + } + + /* Give back the target */ + memcpy(lfi, &fi, sizeof(fi)); + if (savename) { + lfi->name = savename; + lfi->valid |= APR_FINFO_NAME; + } + + return OK; +} + + +/* + * As we walk the directory configuration, the merged config won't + * be 'rooted' to a specific vhost until the very end of the merge. + * + * We need a very fast mini-merge to a real, vhost-rooted merge + * of core.opts and core.override, the only options tested within + * directory_walk itself. + * + * See core.c::merge_core_dir_configs() for explanation. + */ + +typedef struct core_opts_t { + allow_options_t opts; + allow_options_t add; + allow_options_t remove; + overrides_t override; + overrides_t override_opts; + apr_table_t *override_list; +} core_opts_t; + +static void core_opts_merge(const ap_conf_vector_t *sec, core_opts_t *opts) +{ + core_dir_config *this_dir = ap_get_core_module_config(sec); + + if (!this_dir) { + return; + } + + if (this_dir->opts & OPT_UNSET) { + opts->add = (opts->add & ~this_dir->opts_remove) + | this_dir->opts_add; + opts->remove = (opts->remove & ~this_dir->opts_add) + | this_dir->opts_remove; + opts->opts = (opts->opts & ~opts->remove) | opts->add; + } + else { + opts->opts = this_dir->opts; + opts->add = this_dir->opts_add; + opts->remove = this_dir->opts_remove; + } + + if (!(this_dir->override & OR_UNSET)) { + opts->override = this_dir->override; + opts->override_opts = this_dir->override_opts; + } + + if (this_dir->override_list != NULL) { + opts->override_list = this_dir->override_list; + } +} + + +/***************************************************************** + * + * Getting and checking directory configuration. Also checks the + * FollowSymlinks and FollowSymOwner stuff, since this is really the + * only place that can happen (barring a new mid_dir_walk callout). + * + * We can't do it as an access_checker module function which gets + * called with the final per_dir_config, since we could have a directory + * with FollowSymLinks disabled, which contains a symlink to another + * with a .htaccess file which turns FollowSymLinks back on --- and + * access in such a case must be denied. So, whatever it is that + * checks FollowSymLinks needs to know the state of the options as + * they change, all the way down. + */ + +AP_DECLARE(int) ap_directory_walk(request_rec *r) +{ + ap_conf_vector_t *now_merged = NULL; + core_server_config *sconf = + ap_get_core_module_config(r->server->module_config); + ap_conf_vector_t **sec_ent = (ap_conf_vector_t **) sconf->sec_dir->elts; + int num_sec = sconf->sec_dir->nelts; + walk_cache_t *cache; + char *entry_dir; + apr_status_t rv; + int cached; + + /* XXX: Better (faster) tests needed!!! + * + * "OK" as a response to a real problem is not _OK_, but to allow broken + * modules to proceed, we will permit the not-a-path filename to pass the + * following two tests. This behavior may be revoked in future versions + * of Apache. We still must catch it later if it's heading for the core + * handler. Leave INFO notes here for module debugging. + */ + if (r->filename == NULL) { + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00029) + "Module bug? Request filename is missing for URI %s", + r->uri); + return OK; + } + + /* Canonicalize the file path without resolving filename case or aliases + * so we can begin by checking the cache for a recent directory walk. + * This call will ensure we have an absolute path in the same pass. + */ + if ((rv = apr_filepath_merge(&entry_dir, NULL, r->filename, + APR_FILEPATH_NOTRELATIVE, r->pool)) + != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00030) + "Module bug? Request filename path %s is invalid or " + "or not absolute for uri %s", + r->filename, r->uri); + return OK; + } + + /* XXX Notice that this forces path_info to be canonical. That might + * not be desired by all apps. However, some of those same apps likely + * have significant security holes. + */ + r->filename = entry_dir; + + cache = prep_walk_cache(AP_NOTE_DIRECTORY_WALK, r); + cached = (cache->cached != NULL); + + /* If this is not a dirent subrequest with a preconstructed + * r->finfo value, then we can simply stat the filename to + * save burning mega-cycles with unneeded stats - if this is + * an exact file match. We don't care about failure... we + * will stat by component failing this meager attempt. + * + * It would be nice to distinguish APR_ENOENT from other + * types of failure, such as APR_ENOTDIR. We can do something + * with APR_ENOENT, knowing that the path is good. + */ + if (r->finfo.filetype == APR_NOFILE || r->finfo.filetype == APR_LNK) { + rv = ap_run_dirwalk_stat(&r->finfo, r, APR_FINFO_MIN); + + /* some OSs will return APR_SUCCESS/APR_REG if we stat + * a regular file but we have '/' at the end of the name; + * + * other OSs will return APR_ENOTDIR for that situation; + * + * handle it the same everywhere by simulating a failure + * if it looks like a directory but really isn't + * + * Also reset if the stat failed, just for safety. + */ + if ((rv != APR_SUCCESS) || + (r->finfo.filetype != APR_NOFILE && + (r->finfo.filetype != APR_DIR) && + (r->filename[strlen(r->filename) - 1] == '/'))) { + r->finfo.filetype = APR_NOFILE; /* forget what we learned */ + } + } + + if (r->finfo.filetype == APR_REG) { + entry_dir = ap_make_dirstr_parent(r->pool, entry_dir); + } + else if (r->filename[strlen(r->filename) - 1] != '/') { + entry_dir = apr_pstrcat(r->pool, r->filename, "/", NULL); + } + + /* If we have a file already matches the path of r->filename, + * and the vhost's list of directory sections hasn't changed, + * we can skip rewalking the directory_walk entries. + */ + if (cached + && ((r->finfo.filetype == APR_REG) + || ((r->finfo.filetype == APR_DIR) + && (!r->path_info || !*r->path_info))) + && (cache->dir_conf_tested == sec_ent) + && (strcmp(entry_dir, cache->cached) == 0)) { + int familiar = 0; + + /* Well this looks really familiar! If our end-result (per_dir_result) + * didn't change, we have absolutely nothing to do :) + * Otherwise (as is the case with most dir_merged/file_merged requests) + * we must merge our dir_conf_merged onto this new r->per_dir_config. + */ + if (r->per_dir_config == cache->per_dir_result) { + familiar = 1; + } + + if (r->per_dir_config == cache->dir_conf_merged) { + r->per_dir_config = cache->per_dir_result; + familiar = 1; + } + + if (familiar) { + apr_finfo_t thisinfo; + int res; + allow_options_t opts; + core_dir_config *this_dir; + + this_dir = ap_get_core_module_config(r->per_dir_config); + opts = this_dir->opts; + /* + * If Symlinks are allowed in general we do not need the following + * check. + */ + if (!(opts & OPT_SYM_LINKS)) { + rv = ap_run_dirwalk_stat(&thisinfo, r, + APR_FINFO_MIN | APR_FINFO_NAME | APR_FINFO_LINK); + /* + * APR_INCOMPLETE is as fine as result as APR_SUCCESS as we + * have added APR_FINFO_NAME to the wanted parameter of + * apr_stat above. On Unix platforms this means that apr_stat + * is always going to return APR_INCOMPLETE in the case that + * the call to the native stat / lstat did not fail. + */ + if ((rv != APR_INCOMPLETE) && (rv != APR_SUCCESS)) { + /* + * This should never happen, because we did a stat on the + * same file, resolving a possible symlink several lines + * above. Therefore do not make a detailed analysis of rv + * in this case for the reason of the failure, just bail out + * with a HTTP_FORBIDDEN in case we hit a race condition + * here. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00031) + "access to %s failed; stat of '%s' failed.", + r->uri, r->filename); + return r->status = HTTP_FORBIDDEN; + } + if (thisinfo.filetype == APR_LNK) { + /* Is this a possibly acceptable symlink? */ + if ((res = resolve_symlink(r->filename, &thisinfo, + opts, r->pool)) != OK) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00032) + "Symbolic link not allowed " + "or link target not accessible: %s", + r->filename); + return r->status = res; + } + } + } + return OK; + } + + if (cache->walked->nelts) { + now_merged = ((walk_walked_t*)cache->walked->elts) + [cache->walked->nelts - 1].merged; + } + } + else { + /* We start now_merged from NULL since we want to build + * a locations list that can be merged to any vhost. + */ + int sec_idx; + int matches = cache->walked->nelts; + int cached_matches = matches; + walk_walked_t *last_walk = (walk_walked_t*)cache->walked->elts; + core_dir_config *this_dir; + core_opts_t opts; + apr_finfo_t thisinfo; + char *save_path_info; + apr_size_t buflen; + char *buf; + unsigned int seg, startseg; + apr_pool_t *rxpool = NULL; + + /* Invariant: from the first time filename_len is set until + * it goes out of scope, filename_len==strlen(r->filename) + */ + apr_size_t filename_len; +#ifdef CASE_BLIND_FILESYSTEM + apr_size_t canonical_len; +#endif + + cached &= auth_internal_per_conf; + + /* + * We must play our own mini-merge game here, for the few + * running dir_config values we care about within dir_walk. + * We didn't start the merge from r->per_dir_config, so we + * accumulate opts and override as we merge, from the globals. + */ + this_dir = ap_get_core_module_config(r->per_dir_config); + opts.opts = this_dir->opts; + opts.add = this_dir->opts_add; + opts.remove = this_dir->opts_remove; + opts.override = this_dir->override; + opts.override_opts = this_dir->override_opts; + opts.override_list = this_dir->override_list; + + /* Set aside path_info to merge back onto path_info later. + * If r->filename is a directory, we must remerge the path_info, + * before we continue! [Directories cannot, by definition, have + * path info. Either the next segment is not-found, or a file.] + * + * r->path_info tracks the unconsumed source path. + * r->filename tracks the path as we process it + */ + if ((r->finfo.filetype == APR_DIR) && r->path_info && *r->path_info) + { + if ((rv = apr_filepath_merge(&r->path_info, r->filename, + r->path_info, + APR_FILEPATH_NOTABOVEROOT, r->pool)) + != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00033) + "dir_walk error, path_info %s is not relative " + "to the filename path %s for uri %s", + r->path_info, r->filename, r->uri); + return HTTP_INTERNAL_SERVER_ERROR; + } + + save_path_info = NULL; + } + else { + save_path_info = r->path_info; + r->path_info = r->filename; + } + +#ifdef CASE_BLIND_FILESYSTEM + + canonical_len = 0; + while (r->canonical_filename && r->canonical_filename[canonical_len] + && (r->canonical_filename[canonical_len] + == r->path_info[canonical_len])) { + ++canonical_len; + } + + while (canonical_len + && ((r->canonical_filename[canonical_len - 1] != '/' + && r->canonical_filename[canonical_len - 1]) + || (r->path_info[canonical_len - 1] != '/' + && r->path_info[canonical_len - 1]))) { + --canonical_len; + } + + /* + * Now build r->filename component by component, starting + * with the root (on Unix, simply "/"). We will make a huge + * assumption here for efficiency, that any canonical path + * already given included a canonical root. + */ + rv = apr_filepath_root((const char **)&r->filename, + (const char **)&r->path_info, + canonical_len ? 0 : APR_FILEPATH_TRUENAME, + r->pool); + filename_len = strlen(r->filename); + + /* + * Bad assumption above? If the root's length is longer + * than the canonical length, then it cannot be trusted as + * a truename. So try again, this time more seriously. + */ + if ((rv == APR_SUCCESS) && canonical_len + && (filename_len > canonical_len)) { + rv = apr_filepath_root((const char **)&r->filename, + (const char **)&r->path_info, + APR_FILEPATH_TRUENAME, r->pool); + filename_len = strlen(r->filename); + canonical_len = 0; + } + +#else /* ndef CASE_BLIND_FILESYSTEM, really this simple for Unix today; */ + + rv = apr_filepath_root((const char **)&r->filename, + (const char **)&r->path_info, + 0, r->pool); + filename_len = strlen(r->filename); + +#endif + + if (rv != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00034) + "dir_walk error, could not determine the root " + "path of filename %s%s for uri %s", + r->filename, r->path_info, r->uri); + return HTTP_INTERNAL_SERVER_ERROR; + } + + /* Working space for terminating null and an extra / is required. + */ + buflen = filename_len + strlen(r->path_info) + 2; + buf = apr_palloc(r->pool, buflen); + memcpy(buf, r->filename, filename_len + 1); + r->filename = buf; + thisinfo.valid = APR_FINFO_TYPE; + thisinfo.filetype = APR_DIR; /* It's the root, of course it's a dir */ + + /* + * seg keeps track of which segment we've copied. + * sec_idx keeps track of which section we're on, since sections are + * ordered by number of segments. See core_reorder_directories + * startseg tells us how many segments describe the root path + * e.g. the complete path "//host/foo/" to a UNC share (4) + */ + startseg = seg = ap_count_dirs(r->filename); + sec_idx = 0; + + /* + * Go down the directory hierarchy. Where we have to check for + * symlinks, do so. Where a .htaccess file has permission to + * override anything, try to find one. + */ + do { + int res; + char *seg_name; + char *delim; + int temp_slash=0; + + /* We have no trailing slash, but we sure would appreciate one. + * However, we don't want to append a / our first time through. + */ + if ((seg > startseg) && r->filename[filename_len-1] != '/') { + r->filename[filename_len++] = '/'; + r->filename[filename_len] = 0; + temp_slash=1; + } + + /* Begin *this* level by looking for matching <Directory> sections + * from the server config. + */ + for (; sec_idx < num_sec; ++sec_idx) { + + ap_conf_vector_t *entry_config = sec_ent[sec_idx]; + core_dir_config *entry_core; + entry_core = ap_get_core_module_config(entry_config); + + /* No more possible matches for this many segments? + * We are done when we find relative/regex/longer components. + */ + if (entry_core->r || entry_core->d_components > seg) { + break; + } + + /* We will never skip '0' element components, e.g. plain old + * <Directory >, and <Directory "/"> are classified as zero + * so that Win32/Netware/OS2 etc all pick them up. + * Otherwise, skip over the mismatches. + */ + if (entry_core->d_components + && ((entry_core->d_components < seg) + || (entry_core->d_is_fnmatch + ? (apr_fnmatch(entry_core->d, r->filename, + APR_FNM_PATHNAME) != APR_SUCCESS) + : (strcmp(r->filename, entry_core->d) != 0)))) { + continue; + } + + /* If we haven't continue'd above, we have a match. + * + * Calculate our full-context core opts & override. + */ + core_opts_merge(sec_ent[sec_idx], &opts); + + /* If we merged this same section last time, reuse it + */ + if (matches) { + if (last_walk->matched == sec_ent[sec_idx]) { + now_merged = last_walk->merged; + ++last_walk; + --matches; + continue; + } + + /* We fell out of sync. This is our own copy of walked, + * so truncate the remaining matches and reset remaining. + */ + cache->walked->nelts -= matches; + matches = 0; + cached = 0; + } + + if (now_merged) { + now_merged = ap_merge_per_dir_configs(r->pool, + now_merged, + sec_ent[sec_idx]); + } + else { + now_merged = sec_ent[sec_idx]; + } + + last_walk = (walk_walked_t*)apr_array_push(cache->walked); + last_walk->matched = sec_ent[sec_idx]; + last_walk->merged = now_merged; + } + + /* If .htaccess files are enabled, check for one, provided we + * have reached a real path. + */ + do { /* Not really a loop, just a break'able code block */ + + ap_conf_vector_t *htaccess_conf = NULL; + + /* No htaccess in an incomplete root path, + * nor if it's disabled + */ + if (seg < startseg || (!opts.override + && apr_is_empty_table(opts.override_list) + )) { + break; + } + + + res = ap_parse_htaccess(&htaccess_conf, r, opts.override, + opts.override_opts, opts.override_list, + r->filename, sconf->access_name); + if (res) { + return res; + } + + if (!htaccess_conf) { + break; + } + + /* If we are still here, we found our htaccess. + * + * Calculate our full-context core opts & override. + */ + core_opts_merge(htaccess_conf, &opts); + + /* If we merged this same htaccess last time, reuse it... + * this wouldn't work except that we cache the htaccess + * sections for the lifetime of the request, so we match + * the same conf. Good planning (no, pure luck ;) + */ + if (matches) { + if (last_walk->matched == htaccess_conf) { + now_merged = last_walk->merged; + ++last_walk; + --matches; + break; + } + + /* We fell out of sync. This is our own copy of walked, + * so truncate the remaining matches and reset + * remaining. + */ + cache->walked->nelts -= matches; + matches = 0; + cached = 0; + } + + if (now_merged) { + now_merged = ap_merge_per_dir_configs(r->pool, + now_merged, + htaccess_conf); + } + else { + now_merged = htaccess_conf; + } + + last_walk = (walk_walked_t*)apr_array_push(cache->walked); + last_walk->matched = htaccess_conf; + last_walk->merged = now_merged; + + } while (0); /* Only one htaccess, not a real loop */ + + /* That temporary trailing slash was useful, now drop it. + */ + if (temp_slash) { + r->filename[--filename_len] = '\0'; + } + + /* Time for all good things to come to an end? + */ + if (!r->path_info || !*r->path_info) { + break; + } + + /* Now it's time for the next segment... + * We will assume the next element is an end node, and fix it up + * below as necessary... + */ + + seg_name = r->filename + filename_len; + delim = strchr(r->path_info + (*r->path_info == '/' ? 1 : 0), '/'); + if (delim) { + apr_size_t path_info_len = delim - r->path_info; + *delim = '\0'; + memcpy(seg_name, r->path_info, path_info_len + 1); + filename_len += path_info_len; + r->path_info = delim; + *delim = '/'; + } + else { + apr_size_t path_info_len = strlen(r->path_info); + memcpy(seg_name, r->path_info, path_info_len + 1); + filename_len += path_info_len; + r->path_info += path_info_len; + } + if (*seg_name == '/') + ++seg_name; + + /* If nothing remained but a '/' string, we are finished + * XXX: NO WE ARE NOT!!! Now process this puppy!!! */ + if (!*seg_name) { + break; + } + + /* First optimization; + * If...we knew r->filename was a file, and + * if...we have strict (case-sensitive) filenames, or + * we know the canonical_filename matches to _this_ name, and + * if...we have allowed symlinks + * skip the lstat and dummy up an APR_DIR value for thisinfo. + */ + if (r->finfo.filetype != APR_NOFILE +#ifdef CASE_BLIND_FILESYSTEM + && (filename_len <= canonical_len) +#endif + && ((opts.opts & (OPT_SYM_OWNER | OPT_SYM_LINKS)) == OPT_SYM_LINKS)) + { + + thisinfo.filetype = APR_DIR; + ++seg; + continue; + } + + /* We choose apr_stat with flag APR_FINFO_LINK here, rather that + * plain apr_stat, so that we capture this path object rather than + * its target. We will replace the info with our target's info + * below. We especially want the name of this 'link' object, not + * the name of its target, if we are fixing the filename + * case/resolving aliases. + */ + rv = ap_run_dirwalk_stat(&thisinfo, r, + APR_FINFO_MIN | APR_FINFO_NAME | APR_FINFO_LINK); + + if (APR_STATUS_IS_ENOENT(rv)) { + /* Nothing? That could be nice. But our directory + * walk is done. + */ + thisinfo.filetype = APR_NOFILE; + break; + } + else if (APR_STATUS_IS_EACCES(rv)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00035) + "access to %s denied (filesystem path '%s') " + "because search permissions are missing on a " + "component of the path", r->uri, r->filename); + return r->status = HTTP_FORBIDDEN; + } + else if ((rv != APR_SUCCESS && rv != APR_INCOMPLETE) + || !(thisinfo.valid & APR_FINFO_TYPE)) { + /* If we hit ENOTDIR, we must have over-optimized, deny + * rather than assume not found. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00036) + "access to %s failed (filesystem path '%s')", + r->uri, r->filename); + return r->status = HTTP_FORBIDDEN; + } + + /* Fix up the path now if we have a name, and they don't agree + */ + if ((thisinfo.valid & APR_FINFO_NAME) + && strcmp(seg_name, thisinfo.name)) { + /* TODO: provide users an option that an internal/external + * redirect is required here? We need to walk the URI and + * filename in tandem to properly correlate these. + */ + strcpy(seg_name, thisinfo.name); + filename_len = strlen(r->filename); + } + + if (thisinfo.filetype == APR_LNK) { + /* Is this a possibly acceptable symlink? + */ + if ((res = resolve_symlink(r->filename, &thisinfo, + opts.opts, r->pool)) != OK) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00037) + "Symbolic link not allowed " + "or link target not accessible: %s", + r->filename); + return r->status = res; + } + } + + /* Ok, we are done with the link's info, test the real target + */ + if (thisinfo.filetype == APR_REG || + thisinfo.filetype == APR_NOFILE) { + /* That was fun, nothing left for us here + */ + break; + } + else if (thisinfo.filetype != APR_DIR) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00038) + "Forbidden: %s doesn't point to " + "a file or directory", + r->filename); + return r->status = HTTP_FORBIDDEN; + } + + ++seg; + } while (thisinfo.filetype == APR_DIR); + + /* If we have _not_ optimized, this is the time to recover + * the final stat result. + */ + if (r->finfo.filetype == APR_NOFILE || r->finfo.filetype == APR_LNK) { + r->finfo = thisinfo; + } + + /* Now splice the saved path_info back onto any new path_info + */ + if (save_path_info) { + if (r->path_info && *r->path_info) { + r->path_info = ap_make_full_path(r->pool, r->path_info, + save_path_info); + } + else { + r->path_info = save_path_info; + } + } + + /* + * Now we'll deal with the regexes, note we pick up sec_idx + * where we left off (we gave up after we hit entry_core->r) + */ + for (; sec_idx < num_sec; ++sec_idx) { + + int nmatch = 0; + int i; + ap_regmatch_t *pmatch = NULL; + + core_dir_config *entry_core; + entry_core = ap_get_core_module_config(sec_ent[sec_idx]); + + if (!entry_core->r) { + continue; + } + + if (entry_core->refs && entry_core->refs->nelts) { + if (!rxpool) { + apr_pool_create(&rxpool, r->pool); + apr_pool_tag(rxpool, "directory_walk_rxpool"); + } + nmatch = entry_core->refs->nelts; + pmatch = apr_palloc(rxpool, nmatch*sizeof(ap_regmatch_t)); + } + + if (ap_regexec(entry_core->r, r->filename, nmatch, pmatch, 0)) { + continue; + } + + for (i = 0; i < nmatch; i++) { + if (pmatch[i].rm_so >= 0 && pmatch[i].rm_eo >= 0 && + ((const char **)entry_core->refs->elts)[i]) { + apr_table_setn(r->subprocess_env, + ((const char **)entry_core->refs->elts)[i], + apr_pstrndup(r->pool, + r->filename + pmatch[i].rm_so, + pmatch[i].rm_eo - pmatch[i].rm_so)); + } + } + + /* If we haven't already continue'd above, we have a match. + * + * Calculate our full-context core opts & override. + */ + core_opts_merge(sec_ent[sec_idx], &opts); + + /* If we merged this same section last time, reuse it + */ + if (matches) { + if (last_walk->matched == sec_ent[sec_idx]) { + now_merged = last_walk->merged; + ++last_walk; + --matches; + continue; + } + + /* We fell out of sync. This is our own copy of walked, + * so truncate the remaining matches and reset remaining. + */ + cache->walked->nelts -= matches; + matches = 0; + cached = 0; + } + + if (now_merged) { + now_merged = ap_merge_per_dir_configs(r->pool, + now_merged, + sec_ent[sec_idx]); + } + else { + now_merged = sec_ent[sec_idx]; + } + + last_walk = (walk_walked_t*)apr_array_push(cache->walked); + last_walk->matched = sec_ent[sec_idx]; + last_walk->merged = now_merged; + } + + if (rxpool) { + apr_pool_destroy(rxpool); + } + + /* Whoops - everything matched in sequence, but either the original + * walk found some additional matches (which we need to truncate), or + * this walk found some additional matches. + */ + if (matches) { + cache->walked->nelts -= matches; + cached = 0; + } + else if (cache->walked->nelts > cached_matches) { + cached = 0; + } + } + +/* It seems this shouldn't be needed anymore. We translated the + x symlink above into a real resource, and should have died up there. + x Even if we keep this, it needs more thought (maybe an r->file_is_symlink) + x perhaps it should actually happen in file_walk, so we catch more + x obscure cases in autoindex subrequests, etc. + x + x * Symlink permissions are determined by the parent. If the request is + x * for a directory then applying the symlink test here would use the + x * permissions of the directory as opposed to its parent. Consider a + x * symlink pointing to a dir with a .htaccess disallowing symlinks. If + x * you access /symlink (or /symlink/) you would get a 403 without this + x * APR_DIR test. But if you accessed /symlink/index.html, for example, + x * you would *not* get the 403. + x + x if (r->finfo.filetype != APR_DIR + x && (res = resolve_symlink(r->filename, r->info, ap_allow_options(r), + x r->pool))) { + x ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, + x "Symbolic link not allowed: %s", r->filename); + x return res; + x } + */ + + /* Save future sub-requestors much angst in processing + * this subrequest. If dir_walk couldn't canonicalize + * the file path, nothing can. + */ + r->canonical_filename = r->filename; + + if (r->finfo.filetype == APR_DIR) { + cache->cached = apr_pstrdup(r->pool, r->filename); + } + else { + cache->cached = ap_make_dirstr_parent(r->pool, r->filename); + } + + if (cached + && r->per_dir_config == cache->dir_conf_merged) { + r->per_dir_config = cache->per_dir_result; + return OK; + } + + cache->dir_conf_tested = sec_ent; + cache->dir_conf_merged = r->per_dir_config; + + /* Merge our cache->dir_conf_merged construct with the r->per_dir_configs, + * and note the end result to (potentially) skip this step next time. + */ + if (now_merged) { + r->per_dir_config = ap_merge_per_dir_configs(r->pool, + r->per_dir_config, + now_merged); + } + cache->per_dir_result = r->per_dir_config; + + return OK; +} + + +AP_DECLARE(int) ap_location_walk(request_rec *r) +{ + ap_conf_vector_t *now_merged = NULL; + core_server_config *sconf = + ap_get_core_module_config(r->server->module_config); + ap_conf_vector_t **sec_ent = (ap_conf_vector_t **)sconf->sec_url->elts; + int num_sec = sconf->sec_url->nelts; + walk_cache_t *cache; + const char *entry_uri; + int cached; + + /* No tricks here, there are no <Locations > to parse in this vhost. + * We won't destroy the cache, just in case _this_ redirect is later + * redirected again to a vhost with <Location > blocks to optimize. + */ + if (!num_sec) { + return OK; + } + + cache = prep_walk_cache(AP_NOTE_LOCATION_WALK, r); + cached = (cache->cached != NULL); + + /* + * When merge_slashes is set to AP_CORE_CONFIG_OFF the slashes in r->uri + * have not been merged. But for Location walks we always go with merged + * slashes no matter what merge_slashes is set to. + */ + if (sconf->merge_slashes != AP_CORE_CONFIG_OFF) { + entry_uri = r->uri; + } + else { + char *uri = apr_pstrdup(r->pool, r->uri); + ap_no2slash(uri); + entry_uri = uri; + } + + /* If we have an cache->cached location that matches r->uri, + * and the vhost's list of locations hasn't changed, we can skip + * rewalking the location_walk entries. + */ + if (cached + && (cache->dir_conf_tested == sec_ent) + && (strcmp(entry_uri, cache->cached) == 0)) { + /* Well this looks really familiar! If our end-result (per_dir_result) + * didn't change, we have absolutely nothing to do :) + * Otherwise (as is the case with most dir_merged/file_merged requests) + * we must merge our dir_conf_merged onto this new r->per_dir_config. + */ + if (r->per_dir_config == cache->per_dir_result) { + return OK; + } + + if (cache->walked->nelts) { + now_merged = ((walk_walked_t*)cache->walked->elts) + [cache->walked->nelts - 1].merged; + } + } + else { + /* We start now_merged from NULL since we want to build + * a locations list that can be merged to any vhost. + */ + int len, sec_idx; + int matches = cache->walked->nelts; + int cached_matches = matches; + walk_walked_t *last_walk = (walk_walked_t*)cache->walked->elts; + apr_pool_t *rxpool = NULL; + + cached &= auth_internal_per_conf; + cache->cached = apr_pstrdup(r->pool, entry_uri); + + /* Go through the location entries, and check for matches. + * We apply the directive sections in given order, we should + * really try them with the most general first. + */ + for (sec_idx = 0; sec_idx < num_sec; ++sec_idx) { + + core_dir_config *entry_core; + entry_core = ap_get_core_module_config(sec_ent[sec_idx]); + + /* ### const strlen can be optimized in location config parsing */ + len = strlen(entry_core->d); + + /* Test the regex, fnmatch or string as appropriate. + * If it's a strcmp, and the <Location > pattern was + * not slash terminated, then this uri must be slash + * terminated (or at the end of the string) to match. + */ + if (entry_core->r) { + + int nmatch = 0; + int i; + ap_regmatch_t *pmatch = NULL; + + if (entry_core->refs && entry_core->refs->nelts) { + if (!rxpool) { + apr_pool_create(&rxpool, r->pool); + apr_pool_tag(rxpool, "location_walk_rxpool"); + } + nmatch = entry_core->refs->nelts; + pmatch = apr_palloc(rxpool, nmatch*sizeof(ap_regmatch_t)); + } + + if (ap_regexec(entry_core->r, r->uri, nmatch, pmatch, 0)) { + continue; + } + + for (i = 0; i < nmatch; i++) { + if (pmatch[i].rm_so >= 0 && pmatch[i].rm_eo >= 0 && + ((const char **)entry_core->refs->elts)[i]) { + apr_table_setn(r->subprocess_env, + ((const char **)entry_core->refs->elts)[i], + apr_pstrndup(r->pool, + r->uri + pmatch[i].rm_so, + pmatch[i].rm_eo - pmatch[i].rm_so)); + } + } + + } + else { + + if ((entry_core->d_is_fnmatch + ? apr_fnmatch(entry_core->d, cache->cached, APR_FNM_PATHNAME) + : (strncmp(entry_core->d, cache->cached, len) + || (len > 0 + && entry_core->d[len - 1] != '/' + && cache->cached[len] != '/' + && cache->cached[len] != '\0')))) { + continue; + } + + } + + /* If we merged this same section last time, reuse it + */ + if (matches) { + if (last_walk->matched == sec_ent[sec_idx]) { + now_merged = last_walk->merged; + ++last_walk; + --matches; + continue; + } + + /* We fell out of sync. This is our own copy of walked, + * so truncate the remaining matches and reset remaining. + */ + cache->walked->nelts -= matches; + matches = 0; + cached = 0; + } + + if (now_merged) { + now_merged = ap_merge_per_dir_configs(r->pool, + now_merged, + sec_ent[sec_idx]); + } + else { + now_merged = sec_ent[sec_idx]; + } + + last_walk = (walk_walked_t*)apr_array_push(cache->walked); + last_walk->matched = sec_ent[sec_idx]; + last_walk->merged = now_merged; + } + + if (rxpool) { + apr_pool_destroy(rxpool); + } + + /* Whoops - everything matched in sequence, but either the original + * walk found some additional matches (which we need to truncate), or + * this walk found some additional matches. + */ + if (matches) { + cache->walked->nelts -= matches; + cached = 0; + } + else if (cache->walked->nelts > cached_matches) { + cached = 0; + } + } + + if (cached + && r->per_dir_config == cache->dir_conf_merged) { + r->per_dir_config = cache->per_dir_result; + return OK; + } + + cache->dir_conf_tested = sec_ent; + cache->dir_conf_merged = r->per_dir_config; + + /* Merge our cache->dir_conf_merged construct with the r->per_dir_configs, + * and note the end result to (potentially) skip this step next time. + */ + if (now_merged) { + r->per_dir_config = ap_merge_per_dir_configs(r->pool, + r->per_dir_config, + now_merged); + } + cache->per_dir_result = r->per_dir_config; + + return OK; +} + +AP_DECLARE(int) ap_file_walk(request_rec *r) +{ + ap_conf_vector_t *now_merged = NULL; + core_dir_config *dconf = ap_get_core_module_config(r->per_dir_config); + ap_conf_vector_t **sec_ent = NULL; + int num_sec = 0; + walk_cache_t *cache; + const char *test_file; + int cached; + + if (dconf->sec_file) { + sec_ent = (ap_conf_vector_t **)dconf->sec_file->elts; + num_sec = dconf->sec_file->nelts; + } + + /* To allow broken modules to proceed, we allow missing filenames to pass. + * We will catch it later if it's heading for the core handler. + * directory_walk already posted an INFO note for module debugging. + */ + if (r->filename == NULL) { + return OK; + } + + /* No tricks here, there are just no <Files > to parse in this context. + * We won't destroy the cache, just in case _this_ redirect is later + * redirected again to a context containing the same or similar <Files >. + */ + if (!num_sec) { + return OK; + } + + cache = prep_walk_cache(AP_NOTE_FILE_WALK, r); + cached = (cache->cached != NULL); + + /* Get the basename .. and copy for the cache just + * in case r->filename is munged by another module + */ + test_file = strrchr(r->filename, '/'); + if (test_file == NULL) { + test_file = apr_pstrdup(r->pool, r->filename); + } + else { + test_file = apr_pstrdup(r->pool, ++test_file); + } + + /* If we have an cache->cached file name that matches test_file, + * and the directory's list of file sections hasn't changed, we + * can skip rewalking the file_walk entries. + */ + if (cached + && (cache->dir_conf_tested == sec_ent) + && (strcmp(test_file, cache->cached) == 0)) { + /* Well this looks really familiar! If our end-result (per_dir_result) + * didn't change, we have absolutely nothing to do :) + * Otherwise (as is the case with most dir_merged requests) + * we must merge our dir_conf_merged onto this new r->per_dir_config. + */ + if (r->per_dir_config == cache->per_dir_result) { + return OK; + } + + if (cache->walked->nelts) { + now_merged = ((walk_walked_t*)cache->walked->elts) + [cache->walked->nelts - 1].merged; + } + } + else { + /* We start now_merged from NULL since we want to build + * a file section list that can be merged to any dir_walk. + */ + int sec_idx; + int matches = cache->walked->nelts; + int cached_matches = matches; + walk_walked_t *last_walk = (walk_walked_t*)cache->walked->elts; + apr_pool_t *rxpool = NULL; + + cached &= auth_internal_per_conf; + cache->cached = test_file; + + /* Go through the location entries, and check for matches. + * We apply the directive sections in given order, we should + * really try them with the most general first. + */ + for (sec_idx = 0; sec_idx < num_sec; ++sec_idx) { + core_dir_config *entry_core; + entry_core = ap_get_core_module_config(sec_ent[sec_idx]); + + if (entry_core->r) { + + int nmatch = 0; + int i; + ap_regmatch_t *pmatch = NULL; + + if (entry_core->refs && entry_core->refs->nelts) { + if (!rxpool) { + apr_pool_create(&rxpool, r->pool); + apr_pool_tag(rxpool, "file_walk_rxpool"); + } + nmatch = entry_core->refs->nelts; + pmatch = apr_palloc(rxpool, nmatch*sizeof(ap_regmatch_t)); + } + + if (ap_regexec(entry_core->r, cache->cached, nmatch, pmatch, 0)) { + continue; + } + + for (i = 0; i < nmatch; i++) { + if (pmatch[i].rm_so >= 0 && pmatch[i].rm_eo >= 0 && + ((const char **)entry_core->refs->elts)[i]) { + apr_table_setn(r->subprocess_env, + ((const char **)entry_core->refs->elts)[i], + apr_pstrndup(r->pool, + cache->cached + pmatch[i].rm_so, + pmatch[i].rm_eo - pmatch[i].rm_so)); + } + } + + } + else { + if ((entry_core->d_is_fnmatch + ? apr_fnmatch(entry_core->d, cache->cached, APR_FNM_PATHNAME) + : strcmp(entry_core->d, cache->cached))) { + continue; + } + } + + /* If we merged this same section last time, reuse it + */ + if (matches) { + if (last_walk->matched == sec_ent[sec_idx]) { + now_merged = last_walk->merged; + ++last_walk; + --matches; + continue; + } + + /* We fell out of sync. This is our own copy of walked, + * so truncate the remaining matches and reset remaining. + */ + cache->walked->nelts -= matches; + matches = 0; + cached = 0; + } + + if (now_merged) { + now_merged = ap_merge_per_dir_configs(r->pool, + now_merged, + sec_ent[sec_idx]); + } + else { + now_merged = sec_ent[sec_idx]; + } + + last_walk = (walk_walked_t*)apr_array_push(cache->walked); + last_walk->matched = sec_ent[sec_idx]; + last_walk->merged = now_merged; + } + + if (rxpool) { + apr_pool_destroy(rxpool); + } + + /* Whoops - everything matched in sequence, but either the original + * walk found some additional matches (which we need to truncate), or + * this walk found some additional matches. + */ + if (matches) { + cache->walked->nelts -= matches; + cached = 0; + } + else if (cache->walked->nelts > cached_matches) { + cached = 0; + } + } + + if (cached + && r->per_dir_config == cache->dir_conf_merged) { + r->per_dir_config = cache->per_dir_result; + return OK; + } + + cache->dir_conf_tested = sec_ent; + cache->dir_conf_merged = r->per_dir_config; + + /* Merge our cache->dir_conf_merged construct with the r->per_dir_configs, + * and note the end result to (potentially) skip this step next time. + */ + if (now_merged) { + r->per_dir_config = ap_merge_per_dir_configs(r->pool, + r->per_dir_config, + now_merged); + } + cache->per_dir_result = r->per_dir_config; + + return OK; +} + +static int ap_if_walk_sub(request_rec *r, core_dir_config* dconf) +{ + ap_conf_vector_t *now_merged = NULL; + ap_conf_vector_t **sec_ent = NULL; + int num_sec = 0; + walk_cache_t *cache; + int cached; + int sec_idx; + int matches; + int cached_matches; + int prev_result = -1; + walk_walked_t *last_walk; + + if (dconf && dconf->sec_if) { + sec_ent = (ap_conf_vector_t **)dconf->sec_if->elts; + num_sec = dconf->sec_if->nelts; + } + + /* No tricks here, there are just no <If > to parse in this context. + * We won't destroy the cache, just in case _this_ redirect is later + * redirected again to a context containing the same or similar <If >. + */ + if (!num_sec) { + return OK; + } + + cache = prep_walk_cache(AP_NOTE_IF_WALK, r); + cached = (cache->cached != NULL); + cache->cached = (void *)1; + matches = cache->walked->nelts; + cached_matches = matches; + last_walk = (walk_walked_t*)cache->walked->elts; + + cached &= auth_internal_per_conf; + + /* Go through the if entries, and check for matches */ + for (sec_idx = 0; sec_idx < num_sec; ++sec_idx) { + const char *err = NULL; + core_dir_config *entry_core; + int rc; + entry_core = ap_get_core_module_config(sec_ent[sec_idx]); + + AP_DEBUG_ASSERT(entry_core->condition_ifelse != 0); + if (entry_core->condition_ifelse & AP_CONDITION_ELSE) { + AP_DEBUG_ASSERT(prev_result != -1); + if (prev_result == 1) + continue; + } + + if (entry_core->condition_ifelse & AP_CONDITION_IF) { + rc = ap_expr_exec(r, entry_core->condition, &err); + if (rc <= 0) { + if (rc < 0) + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00039) + "Failed to evaluate <If > condition: %s", + err); + prev_result = 0; + continue; + } + prev_result = 1; + } + else { + prev_result = -1; + } + + /* If we merged this same section last time, reuse it + */ + if (matches) { + if (last_walk->matched == sec_ent[sec_idx]) { + now_merged = last_walk->merged; + ++last_walk; + --matches; + continue; + } + + /* We fell out of sync. This is our own copy of walked, + * so truncate the remaining matches and reset remaining. + */ + cache->walked->nelts -= matches; + matches = 0; + cached = 0; + } + + if (now_merged) { + now_merged = ap_merge_per_dir_configs(r->pool, + now_merged, + sec_ent[sec_idx]); + } + else { + now_merged = sec_ent[sec_idx]; + } + + last_walk = (walk_walked_t*)apr_array_push(cache->walked); + last_walk->matched = sec_ent[sec_idx]; + last_walk->merged = now_merged; + } + + /* Everything matched in sequence, but it may be that the original + * walk found some additional matches (which we need to truncate), or + * this walk found some additional matches. + */ + if (matches) { + cache->walked->nelts -= matches; + cached = 0; + } + else if (cache->walked->nelts > cached_matches) { + cached = 0; + } + + if (cached + && r->per_dir_config == cache->dir_conf_merged) { + r->per_dir_config = cache->per_dir_result; + return OK; + } + + cache->dir_conf_tested = sec_ent; + cache->dir_conf_merged = r->per_dir_config; + + /* Merge our cache->dir_conf_merged construct with the r->per_dir_configs, + * and note the end result to (potentially) skip this step next time. + */ + if (now_merged) { + r->per_dir_config = ap_merge_per_dir_configs(r->pool, + r->per_dir_config, + now_merged); + } + cache->per_dir_result = r->per_dir_config; + + if (now_merged) { + core_dir_config *dconf_merged = ap_get_core_module_config(now_merged); + + /* Allow nested <If>s and their configs to get merged + * with the current one. + */ + return ap_if_walk_sub(r, dconf_merged); + } + + return OK; +} + +AP_DECLARE(int) ap_if_walk(request_rec *r) +{ + core_dir_config *dconf = ap_get_core_module_config(r->per_dir_config); + int status = ap_if_walk_sub(r, dconf); + return status; +} + +/***************************************************************** + * + * The sub_request mechanism. + * + * Fns to look up a relative URI from, e.g., a map file or SSI document. + * These do all access checks, etc., but don't actually run the transaction + * ... use run_sub_req below for that. Also, be sure to use destroy_sub_req + * as appropriate if you're likely to be creating more than a few of these. + * (An early Apache version didn't destroy the sub_reqs used in directory + * indexing. The result, when indexing a directory with 800-odd files in + * it, was massively excessive storage allocation). + * + * Note more manipulation of protocol-specific vars in the request + * structure... + */ + +static request_rec *make_sub_request(const request_rec *r, + ap_filter_t *next_filter) +{ + apr_pool_t *rrp; + request_rec *rnew; + + apr_pool_create(&rrp, r->pool); + apr_pool_tag(rrp, "subrequest"); + rnew = apr_pcalloc(rrp, sizeof(request_rec)); + rnew->pool = rrp; + + rnew->hostname = r->hostname; + rnew->request_time = r->request_time; + rnew->connection = r->connection; + rnew->server = r->server; + rnew->log = r->log; + + rnew->request_config = ap_create_request_config(rnew->pool); + + /* Start a clean config from this subrequest's vhost. Optimization in + * Location/File/Dir walks from the parent request assure that if the + * config blocks of the subrequest match the parent request, no merges + * will actually occur (and generally a minimal number of merges are + * required, even if the parent and subrequest aren't quite identical.) + */ + rnew->per_dir_config = r->server->lookup_defaults; + + rnew->htaccess = r->htaccess; + rnew->allowed_methods = ap_make_method_list(rnew->pool, 2); + + /* make a copy of the allowed-methods list */ + ap_copy_method_list(rnew->allowed_methods, r->allowed_methods); + + /* start with the same set of output filters */ + if (next_filter) { + ap_filter_t *scan = next_filter; + + /* while there are no input filters for a subrequest, we will + * try to insert some, so if we don't have valid data, the code + * will seg fault. + */ + rnew->input_filters = r->input_filters; + rnew->proto_input_filters = r->proto_input_filters; + rnew->output_filters = next_filter; + rnew->proto_output_filters = r->proto_output_filters; + while (scan && (scan != r->proto_output_filters)) { + if (scan->frec == ap_subreq_core_filter_handle) { + break; + } + scan = scan->next; + } + if (!scan || scan == r->proto_output_filters) { + ap_add_output_filter_handle(ap_subreq_core_filter_handle, + NULL, rnew, rnew->connection); + } + } + else { + /* If NULL - we are expecting to be internal_fast_redirect'ed + * to this subrequest - or this request will never be invoked. + * Ignore the original request filter stack entirely, and + * drill the input and output stacks back to the connection. + */ + rnew->proto_input_filters = r->proto_input_filters; + rnew->proto_output_filters = r->proto_output_filters; + + rnew->input_filters = r->proto_input_filters; + rnew->output_filters = r->proto_output_filters; + } + + rnew->useragent_addr = r->useragent_addr; + rnew->useragent_ip = r->useragent_ip; + + /* no input filters for a subrequest */ + + ap_set_sub_req_protocol(rnew, r); + + /* We have to run this after we fill in sub req vars, + * or the r->main pointer won't be setup + */ + ap_run_create_request(rnew); + + /* Begin by presuming any module can make its own path_info assumptions, + * until some module interjects and changes the value. + */ + rnew->used_path_info = AP_REQ_DEFAULT_PATH_INFO; + + /* Pass on the kept body (if any) into the new request. */ + rnew->kept_body = r->kept_body; + + return rnew; +} + +AP_CORE_DECLARE_NONSTD(apr_status_t) ap_sub_req_output_filter(ap_filter_t *f, + apr_bucket_brigade *bb) +{ + apr_bucket *e = APR_BRIGADE_LAST(bb); + + if (APR_BUCKET_IS_EOS(e)) { + apr_bucket_delete(e); + } + + if (!APR_BRIGADE_EMPTY(bb)) { + return ap_pass_brigade(f->next, bb); + } + + return APR_SUCCESS; +} + +extern APR_OPTIONAL_FN_TYPE(authz_some_auth_required) *ap__authz_ap_some_auth_required; + +AP_DECLARE(int) ap_some_auth_required(request_rec *r) +{ + /* Is there a require line configured for the type of *this* req? */ + if (ap__authz_ap_some_auth_required) { + return ap__authz_ap_some_auth_required(r); + } + else + return 0; +} + +AP_DECLARE(void) ap_clear_auth_internal(void) +{ + auth_internal_per_conf_hooks = 0; + auth_internal_per_conf_providers = 0; +} + +AP_DECLARE(void) ap_setup_auth_internal(apr_pool_t *ptemp) +{ + int total_auth_hooks = 0; + int total_auth_providers = 0; + + auth_internal_per_conf = 0; + + if (_hooks.link_access_checker) { + total_auth_hooks += _hooks.link_access_checker->nelts; + } + if (_hooks.link_access_checker_ex) { + total_auth_hooks += _hooks.link_access_checker_ex->nelts; + } + if (_hooks.link_check_user_id) { + total_auth_hooks += _hooks.link_check_user_id->nelts; + } + if (_hooks.link_auth_checker) { + total_auth_hooks += _hooks.link_auth_checker->nelts; + } + + if (total_auth_hooks > auth_internal_per_conf_hooks) { + return; + } + + total_auth_providers += + ap_list_provider_names(ptemp, AUTHN_PROVIDER_GROUP, + AUTHN_PROVIDER_VERSION)->nelts; + total_auth_providers += + ap_list_provider_names(ptemp, AUTHZ_PROVIDER_GROUP, + AUTHZ_PROVIDER_VERSION)->nelts; + + if (total_auth_providers > auth_internal_per_conf_providers) { + return; + } + + auth_internal_per_conf = 1; +} + +AP_DECLARE(apr_status_t) ap_register_auth_provider(apr_pool_t *pool, + const char *provider_group, + const char *provider_name, + const char *provider_version, + const void *provider, + int type) +{ + if ((type & AP_AUTH_INTERNAL_MASK) == AP_AUTH_INTERNAL_PER_CONF) { + ++auth_internal_per_conf_providers; + } + + return ap_register_provider(pool, provider_group, provider_name, + provider_version, provider); +} + +AP_DECLARE(void) ap_hook_check_access(ap_HOOK_access_checker_t *pf, + const char * const *aszPre, + const char * const *aszSucc, + int nOrder, int type) +{ + if ((type & AP_AUTH_INTERNAL_MASK) == AP_AUTH_INTERNAL_PER_CONF) { + ++auth_internal_per_conf_hooks; + } + + ap_hook_access_checker(pf, aszPre, aszSucc, nOrder); +} + +AP_DECLARE(void) ap_hook_check_access_ex(ap_HOOK_access_checker_ex_t *pf, + const char * const *aszPre, + const char * const *aszSucc, + int nOrder, int type) +{ + if ((type & AP_AUTH_INTERNAL_MASK) == AP_AUTH_INTERNAL_PER_CONF) { + ++auth_internal_per_conf_hooks; + } + + ap_hook_access_checker_ex(pf, aszPre, aszSucc, nOrder); +} + +AP_DECLARE(void) ap_hook_check_authn(ap_HOOK_check_user_id_t *pf, + const char * const *aszPre, + const char * const *aszSucc, + int nOrder, int type) +{ + if ((type & AP_AUTH_INTERNAL_MASK) == AP_AUTH_INTERNAL_PER_CONF) { + ++auth_internal_per_conf_hooks; + } + + ap_hook_check_user_id(pf, aszPre, aszSucc, nOrder); +} + +AP_DECLARE(void) ap_hook_check_authz(ap_HOOK_auth_checker_t *pf, + const char * const *aszPre, + const char * const *aszSucc, + int nOrder, int type) +{ + if ((type & AP_AUTH_INTERNAL_MASK) == AP_AUTH_INTERNAL_PER_CONF) { + ++auth_internal_per_conf_hooks; + } + + ap_hook_auth_checker(pf, aszPre, aszSucc, nOrder); +} + +AP_DECLARE(request_rec *) ap_sub_req_method_uri(const char *method, + const char *new_uri, + const request_rec *r, + ap_filter_t *next_filter) +{ + request_rec *rnew; + /* Initialise res, to avoid a gcc warning */ + int res = HTTP_INTERNAL_SERVER_ERROR; + char *udir; + + rnew = make_sub_request(r, next_filter); + + /* would be nicer to pass "method" to ap_set_sub_req_protocol */ + rnew->method = method; + rnew->method_number = ap_method_number_of(method); + + if (new_uri[0] == '/') { + ap_parse_uri(rnew, new_uri); + } + else { + udir = ap_make_dirstr_parent(rnew->pool, r->uri); + udir = ap_escape_uri(rnew->pool, udir); /* re-escape it */ + ap_parse_uri(rnew, ap_make_full_path(rnew->pool, udir, new_uri)); + } + + /* We cannot return NULL without violating the API. So just turn this + * subrequest into a 500 to indicate the failure. */ + if (ap_is_recursion_limit_exceeded(r)) { + rnew->status = HTTP_INTERNAL_SERVER_ERROR; + return rnew; + } + + /* lookup_uri + * If the content can be served by the quick_handler, we can + * safely bypass request_internal processing. + * + * If next_filter is NULL we are expecting to be + * internal_fast_redirect'ed to the subrequest, or the subrequest will + * never be invoked. We need to make sure that the quickhandler is not + * invoked by any lookups. Since an internal_fast_redirect will always + * occur too late for the quickhandler to handle the request. + */ + if (next_filter) { + res = ap_run_quick_handler(rnew, 1); + } + + if (next_filter == NULL || res != OK) { + if ((res = ap_process_request_internal(rnew))) { + rnew->status = res; + } + } + + return rnew; +} + +AP_DECLARE(request_rec *) ap_sub_req_lookup_uri(const char *new_uri, + const request_rec *r, + ap_filter_t *next_filter) +{ + return ap_sub_req_method_uri("GET", new_uri, r, next_filter); +} + +AP_DECLARE(request_rec *) ap_sub_req_lookup_dirent(const apr_finfo_t *dirent, + const request_rec *r, + int subtype, + ap_filter_t *next_filter) +{ + request_rec *rnew; + int res; + char *fdir; + char *udir; + + rnew = make_sub_request(r, next_filter); + + /* Special case: we are looking at a relative lookup in the same directory. + * This is 100% safe, since dirent->name just came from the filesystem. + */ + if (r->path_info && *r->path_info) { + /* strip path_info off the end of the uri to keep it in sync + * with r->filename, which has already been stripped by directory_walk, + * merge the dirent->name, and then, if the caller wants us to remerge + * the original path info, do so. Note we never fix the path_info back + * to r->filename, since dir_walk would do so (but we don't expect it + * to happen in the usual cases) + */ + udir = apr_pstrdup(rnew->pool, r->uri); + udir[ap_find_path_info(udir, r->path_info)] = '\0'; + udir = ap_make_dirstr_parent(rnew->pool, udir); + + rnew->uri = ap_make_full_path(rnew->pool, udir, dirent->name); + if (subtype == AP_SUBREQ_MERGE_ARGS) { + rnew->uri = ap_make_full_path(rnew->pool, rnew->uri, r->path_info + 1); + rnew->path_info = apr_pstrdup(rnew->pool, r->path_info); + } + rnew->uri = ap_escape_uri(rnew->pool, rnew->uri); + } + else { + udir = ap_make_dirstr_parent(rnew->pool, r->uri); + rnew->uri = ap_escape_uri(rnew->pool, ap_make_full_path(rnew->pool, + udir, + dirent->name)); + } + + fdir = ap_make_dirstr_parent(rnew->pool, r->filename); + rnew->filename = ap_make_full_path(rnew->pool, fdir, dirent->name); + if (r->canonical_filename == r->filename) { + rnew->canonical_filename = rnew->filename; + } + + /* XXX This is now less relevant; we will do a full location walk + * these days for this case. Preserve the apr_stat results, and + * perhaps we also tag that symlinks were tested and/or found for + * r->filename. + */ + rnew->per_dir_config = r->server->lookup_defaults; + + if ((dirent->valid & APR_FINFO_MIN) != APR_FINFO_MIN) { + /* + * apr_dir_read isn't very complete on this platform, so + * we need another apr_stat (with or without APR_FINFO_LINK + * depending on whether we allow all symlinks here.) If this + * is an APR_LNK that resolves to an APR_DIR, then we will rerun + * everything anyways... this should be safe. + */ + apr_status_t rv; + if (ap_allow_options(rnew) & OPT_SYM_LINKS) { + if (((rv = apr_stat(&rnew->finfo, rnew->filename, + APR_FINFO_MIN, rnew->pool)) != APR_SUCCESS) + && (rv != APR_INCOMPLETE)) { + rnew->finfo.filetype = APR_NOFILE; + } + } + else { + if (((rv = apr_stat(&rnew->finfo, rnew->filename, + APR_FINFO_LINK | APR_FINFO_MIN, + rnew->pool)) != APR_SUCCESS) + && (rv != APR_INCOMPLETE)) { + rnew->finfo.filetype = APR_NOFILE; + } + } + } + else { + memcpy(&rnew->finfo, dirent, sizeof(apr_finfo_t)); + } + + if (rnew->finfo.filetype == APR_LNK) { + /* + * Resolve this symlink. We should tie this back to dir_walk's cache + */ + if ((res = resolve_symlink(rnew->filename, &rnew->finfo, + ap_allow_options(rnew), rnew->pool)) + != OK) { + rnew->status = res; + return rnew; + } + } + + if (rnew->finfo.filetype == APR_DIR) { + /* ap_make_full_path overallocated the buffers + * by one character to help us out here. + */ + strcat(rnew->filename, "/"); + if (!rnew->path_info || !*rnew->path_info) { + strcat(rnew->uri, "/"); + } + } + + /* fill in parsed_uri values + */ + if (r->args && *r->args && (subtype == AP_SUBREQ_MERGE_ARGS)) { + ap_parse_uri(rnew, apr_pstrcat(r->pool, rnew->uri, "?", + r->args, NULL)); + } + else { + ap_parse_uri(rnew, rnew->uri); + } + + /* We cannot return NULL without violating the API. So just turn this + * subrequest into a 500. */ + if (ap_is_recursion_limit_exceeded(r)) { + rnew->status = HTTP_INTERNAL_SERVER_ERROR; + return rnew; + } + + if ((res = ap_process_request_internal(rnew))) { + rnew->status = res; + } + + return rnew; +} + +AP_DECLARE(request_rec *) ap_sub_req_lookup_file(const char *new_file, + const request_rec *r, + ap_filter_t *next_filter) +{ + request_rec *rnew; + int res; + char *fdir; + apr_size_t fdirlen; + + rnew = make_sub_request(r, next_filter); + + fdir = ap_make_dirstr_parent(rnew->pool, r->filename); + fdirlen = strlen(fdir); + + /* Translate r->filename, if it was canonical, it stays canonical + */ + if (r->canonical_filename == r->filename) { + rnew->canonical_filename = (char*)(1); + } + + if (apr_filepath_merge(&rnew->filename, fdir, new_file, + APR_FILEPATH_TRUENAME, rnew->pool) != APR_SUCCESS) { + rnew->status = HTTP_FORBIDDEN; + return rnew; + } + + if (rnew->canonical_filename) { + rnew->canonical_filename = rnew->filename; + } + + /* + * Check for a special case... if there are no '/' characters in new_file + * at all, and the path was the same, then we are looking at a relative + * lookup in the same directory. Fixup the URI to match. + */ + + if (strncmp(rnew->filename, fdir, fdirlen) == 0 + && rnew->filename[fdirlen] + && ap_strchr_c(rnew->filename + fdirlen, '/') == NULL) { + apr_status_t rv; + if (ap_allow_options(rnew) & OPT_SYM_LINKS) { + if (((rv = apr_stat(&rnew->finfo, rnew->filename, + APR_FINFO_MIN, rnew->pool)) != APR_SUCCESS) + && (rv != APR_INCOMPLETE)) { + rnew->finfo.filetype = APR_NOFILE; + } + } + else { + if (((rv = apr_stat(&rnew->finfo, rnew->filename, + APR_FINFO_LINK | APR_FINFO_MIN, + rnew->pool)) != APR_SUCCESS) + && (rv != APR_INCOMPLETE)) { + rnew->finfo.filetype = APR_NOFILE; + } + } + + if (r->uri && *r->uri) { + char *udir = ap_make_dirstr_parent(rnew->pool, r->uri); + rnew->uri = ap_make_full_path(rnew->pool, udir, + rnew->filename + fdirlen); + ap_parse_uri(rnew, rnew->uri); /* fill in parsed_uri values */ + } + else { + ap_parse_uri(rnew, new_file); /* fill in parsed_uri values */ + rnew->uri = apr_pstrdup(rnew->pool, ""); + } + } + else { + /* XXX: @@@: What should be done with the parsed_uri values? + * We would be better off stripping down to the 'common' elements + * of the path, then reassembling the URI as best as we can. + */ + ap_parse_uri(rnew, new_file); /* fill in parsed_uri values */ + /* + * XXX: this should be set properly like it is in the same-dir case + * but it's actually sometimes to impossible to do it... because the + * file may not have a uri associated with it -djg + */ + rnew->uri = apr_pstrdup(rnew->pool, ""); + } + + /* We cannot return NULL without violating the API. So just turn this + * subrequest into a 500. */ + if (ap_is_recursion_limit_exceeded(r)) { + rnew->status = HTTP_INTERNAL_SERVER_ERROR; + return rnew; + } + + if ((res = ap_process_request_internal(rnew))) { + rnew->status = res; + } + + return rnew; +} + +AP_DECLARE(int) ap_run_sub_req(request_rec *r) +{ + int retval = DECLINED; + /* Run the quick handler if the subrequest is not a dirent or file + * subrequest + */ + if (!(r->filename && r->finfo.filetype != APR_NOFILE)) { + retval = ap_run_quick_handler(r, 0); + } + if (retval != OK) { + retval = ap_invoke_handler(r); + if (retval == DONE) { + retval = OK; + } + } + ap_finalize_sub_req_protocol(r); + return retval; +} + +AP_DECLARE(void) ap_destroy_sub_req(request_rec *r) +{ + /* Reclaim the space */ + apr_pool_destroy(r->pool); +} + +/* + * Function to set the r->mtime field to the specified value if it's later + * than what's already there. + */ +AP_DECLARE(void) ap_update_mtime(request_rec *r, apr_time_t dependency_mtime) +{ + if (r->mtime < dependency_mtime) { + r->mtime = dependency_mtime; + } +} + +/* + * Is it the initial main request, which we only get *once* per HTTP request? + */ +AP_DECLARE(int) ap_is_initial_req(request_rec *r) +{ + return (r->main == NULL) /* otherwise, this is a sub-request */ + && (r->prev == NULL); /* otherwise, this is an internal redirect */ +} + |