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/* 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(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,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;
}
/* 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 file_req = (r->main && r->filename);
int access_status;
core_dir_config *d;
/* Ignore embedded %2F's in path for proxy requests */
if (!r->proxyreq && r->parsed_uri.path) {
d = ap_get_core_module_config(r->per_dir_config);
if (d->allow_encoded_slashes) {
access_status = ap_unescape_url_keep2f(r->parsed_uri.path, d->decode_encoded_slashes);
}
else {
access_status = ap_unescape_url(r->parsed_uri.path);
}
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 "
"(decoded='%s'), returning 404",
r->parsed_uri.path);
}
}
return access_status;
}
}
ap_getparents(r->uri); /* OK --- shrinking transformations... */
/* 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 translate_name kill the request.
*/
if (!file_req) {
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;
}
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 = 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;
}
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 {