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apache/server/request.c
Ryan Bloom 1e90a12ab2 Fix a seg fault in mod_include. When we are generating an 
internal redirect, we must set r->uri to "", not a bogus
string, and not NULL.  [Ryan Bloom]


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90929 13f79535-47bb-0310-9956-ffa450edef68
2001-09-06 17:58:28 +00:00

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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/*
* http_request.c: functions to get and process requests
*
* 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"
#define CORE_PRIVATE
#include "ap_config.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 "mod_core.h"
#if APR_HAVE_STDARG_H
#include <stdarg.h>
#endif
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(auth_checker)
APR_HOOK_LINK(insert_filter)
APR_HOOK_LINK(create_request)
)
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,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)
static int decl_die(int status, char *phase, request_rec *r)
{
if (status == DECLINED) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_CRIT, 0, r,
"configuration error: couldn't %s: %s", phase, r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
else
return status;
}
/* 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;
/* Ignore embedded %2F's in path for proxy requests */
if (!r->proxyreq && r->parsed_uri.path) {
access_status = ap_unescape_url(r->parsed_uri.path);
if (access_status) {
return access_status;
}
}
ap_getparents(r->uri); /* OK --- shrinking transformations... */
if ((access_status = ap_location_walk(r))) {
return access_status;
}
if ((access_status = ap_run_translate_name(r))) {
return decl_die(access_status, "translate", r);
return access_status;
}
if ((access_status = ap_run_map_to_storage(r))) {
/* This request wasn't in storage (e.g. TRACE) */
if (access_status == DONE)
return OK;
else
return access_status;
}
if ((access_status = ap_location_walk(r))) {
return access_status;
}
/* Only on the main request! */
if (r->main == NULL) {
if ((access_status = ap_run_header_parser(r))) {
return access_status;
}
}
switch (ap_satisfies(r)) {
case SATISFY_ALL:
case SATISFY_NOSPEC:
if ((access_status = ap_run_access_checker(r)) != 0) {
return decl_die(access_status, "check access", r);
}
if (ap_some_auth_required(r)) {
if (((access_status = ap_run_check_user_id(r)) != 0) || !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check user. No user file?"
: "perform authentication. AuthType not set!", r);
}
if (((access_status = ap_run_auth_checker(r)) != 0) || !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check access. No groups file?"
: "perform authentication. AuthType not set!", r);
}
}
break;
case SATISFY_ANY:
if (((access_status = ap_run_access_checker(r)) != 0) || !ap_auth_type(r)) {
if (!ap_some_auth_required(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check access"
: "perform authentication. AuthType not set!", r);
}
if (((access_status = ap_run_check_user_id(r)) != 0) || !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check user. No user file?"
: "perform authentication. AuthType not set!", r);
}
if (((access_status = ap_run_auth_checker(r)) != 0) || !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check access. No groups file?"
: "perform authentication. AuthType not set!", 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)) != 0) {
return decl_die(access_status, "find types", r);
}
if ((access_status = ap_run_fixups(r)) != 0) {
return access_status;
}
/* The new insert_filter stage makes sense here IMHO. We are sure that
* we are going to run the request now, so we may as well insert filters
* if any are available. Since the goal of this phase is to allow all
* modules to insert a filter if they want to, this filter returns
* void. I just can't see any way that this filter can reasonably
* fail, either your modules inserts something or it doesn't. rbb
*/
ap_run_insert_filter(r);
return OK;
}
/*****************************************************************
*
* 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.
*/
/*
* We don't want people able to serve up pipes, or unix sockets, or other
* scary things. Note that symlink tests are performed later.
*/
static int check_safe_file(request_rec *r)
{
if (r->finfo.filetype == 0 /* doesn't exist */
|| r->finfo.filetype == APR_DIR
|| r->finfo.filetype == APR_REG
|| r->finfo.filetype == APR_LNK) {
return OK;
}
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"object is not a file, directory or symlink: %s",
r->filename);
return HTTP_FORBIDDEN;
}
#ifdef REPLACE_PATH_INFO_METHOD
/*
* 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;
int res;
if (!(opts & (OPT_SYM_OWNER | OPT_SYM_LINKS)))
return HTTP_FORBIDDEN;
if (opts & OPT_SYM_LINKS) {
if ((res = apr_stat(&fi, d, lfi->valid, p)) != APR_SUCCESS)
return HTTP_FORBIDDEN;
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 ((res = apr_lstat(&fi, d, lfi->valid | APR_FINFO_OWNER, p))
!= APR_SUCCESS)
return HTTP_FORBIDDEN;
if ((res = apr_stat(&fi, d, lfi->valid, p)) != APR_SUCCESS)
return HTTP_FORBIDDEN;
if (apr_compare_users(fi.user, lfi->user) != APR_SUCCESS)
return HTTP_FORBIDDEN;
/* Give back the target */
memcpy(lfi, &fi, sizeof(fi));
return OK;
}
#endif /* REPLACE_PATH_INFO_METHOD */
#ifndef REPLACE_PATH_INFO_METHOD
static int check_symlinks(char *d, int opts, apr_pool_t *p)
{
#if defined(OS2)
/* OS/2 doesn't have symlinks */
return OK;
#else
apr_finfo_t lfi, fi;
char *lastp;
int res;
if (opts & OPT_SYM_LINKS)
return OK;
/*
* Strip trailing '/', if any, off what we're checking; trailing slashes
* make some systems follow symlinks to directories even in lstat().
* After we've done the lstat, put it back. Also, don't bother checking
* '/' at all...
*
* Note that we don't have to worry about multiple slashes here because of
* no2slash() below...
*/
lastp = d + strlen(d) - 1;
if (lastp == d)
return OK; /* Root directory, '/' */
if (*lastp == '/')
*lastp = '\0';
else
lastp = NULL;
res = apr_lstat(&lfi, d, APR_FINFO_TYPE | APR_FINFO_OWNER, p);
if (lastp)
*lastp = '/';
/*
* Note that we don't reject accesses to nonexistent files (multiviews or
* the like may cons up a way to run the transaction anyway)...
*/
if ((res != APR_SUCCESS && res != APR_INCOMPLETE)
|| (lfi.filetype != APR_LNK))
return OK;
/* OK, it's a symlink. May still be OK with OPT_SYM_OWNER */
if (!(opts & OPT_SYM_OWNER))
return HTTP_FORBIDDEN;
/* OPT_SYM_OWNER only works if we can get the owner from the file */
if (res != APR_SUCCESS)
return HTTP_FORBIDDEN;
if (apr_stat(&fi, d, APR_FINFO_OWNER, p) != APR_SUCCESS)
return HTTP_FORBIDDEN;
/* TODO: replace with an apr_compare_users() fn */
return (fi.user == lfi.user) ? OK : HTTP_FORBIDDEN;
#endif
}
/* Dealing with the file system to get PATH_INFO
*/
static int get_path_info(request_rec *r)
{
char *cp;
char *path = r->filename;
char *end = &path[strlen(path)];
char *last_cp = NULL;
int rv;
#if defined(HAVE_DRIVE_LETTERS) || defined(HAVE_UNC_PATHS)
char bStripSlash=1;
#endif
if (r->finfo.filetype != APR_NOFILE) {
/* assume path_info already set */
return OK;
}
#ifdef HAVE_DRIVE_LETTERS
/* If the directory is x:\, then we don't want to strip
* the trailing slash since x: is not a valid directory.
*/
if (strlen(path) == 3 && path[1] == ':' && path[2] == '/')
bStripSlash = 0;
#endif
#ifdef HAVE_UNC_PATHS
/* If UNC name == //machine/share/, do not
* advance over the trailing slash. Any other
* UNC name is OK to strip the slash.
*/
cp = end;
if (path[0] == '/' && path[1] == '/' &&
path[2] != '/' && cp[-1] == '/') {
char *p;
int iCount=0;
p = path;
while ((p = strchr(p,'/')) != NULL) {
p++;
iCount++;
}
if (iCount == 4)
bStripSlash = 0;
}
#endif
#if defined(HAVE_DRIVE_LETTERS) || defined(HAVE_UNC_PATHS)
if (bStripSlash)
#endif
/* Advance over trailing slashes ... NOT part of filename
* if file is not a UNC name (Win32 only).
*/
for (cp = end; cp > path && cp[-1] == '/'; --cp)
continue;
while (cp > path) {
/* See if the pathname ending here exists... */
*cp = '\0';
/* ### We no longer need the test ap_os_is_filename_valid() here
* since apr_stat isn't a posix thing - it's apr_stat's responsibility
* to handle whatever path string arrives at its door - by platform
* and volume restrictions as applicable...
* TODO: This code becomes even simpler if apr_stat grows
* an APR_PATHINCOMPLETE result to indicate that we are staring at
* an partial virtual root. Only OS2/Win32/Netware need apply it :-)
*/
rv = apr_stat(&r->finfo, path, APR_FINFO_MIN, r->pool);
if (cp != end)
*cp = '/';
if (rv == APR_SUCCESS || rv == APR_INCOMPLETE) {
/*
* Aha! Found something. If it was a directory, we will search
* contents of that directory for a multi_match, so the PATH_INFO
* argument starts with the component after that.
*/
if (r->finfo.filetype == APR_DIR && last_cp) {
r->finfo.filetype = APR_NOFILE; /* No such file... */
cp = last_cp;
}
r->path_info = apr_pstrdup(r->pool, cp);
*cp = '\0';
return OK;
}
if (APR_STATUS_IS_ENOENT(rv) || APR_STATUS_IS_ENOTDIR(rv)) {
last_cp = cp;
while (--cp > path && *cp != '/')
continue;
while (cp > path && cp[-1] == '/')
--cp;
}
else {
if (APR_STATUS_IS_EACCES(rv))
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"access to %s denied", r->uri);
else
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"access to %s failed", r->uri);
return HTTP_FORBIDDEN;
}
}
return OK;
}
AP_DECLARE(int) ap_directory_walk(request_rec *r)
{
core_server_config *sconf = ap_get_module_config(r->server->module_config,
&core_module);
ap_conf_vector_t *per_dir_defaults = r->server->lookup_defaults;
ap_conf_vector_t **sec_dir = (ap_conf_vector_t **) sconf->sec_dir->elts;
int num_sec = sconf->sec_dir->nelts;
char *test_filename;
char *test_dirname;
int res;
unsigned i, num_dirs;
int j, test_filename_len;
unsigned iStart = 1;
ap_conf_vector_t *entry_config;
ap_conf_vector_t *this_conf;
core_dir_config *entry_core;
/*
* Are we dealing with a file? If not, the handler needed to register
* a hook to escape from our walking the file. Since they haven't, we
* are going to assume the worst and refuse to proceed.
*/
if (r->filename == NULL || !ap_os_is_path_absolute(r->pool, r->filename)) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Module bug? Request filename path %s is missing or "
"or not absolute for uri %s",
r->filename ? r->filename : "<NULL>", r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
/*
* 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. If either of these things fails, we could poke
* around, see why, and adjust the lookup_rec accordingly --- this might
* save us a call to get_path_info (with the attendant stat()s); however,
* for the moment, that's not worth the trouble.
*/
res = get_path_info(r);
if (res != OK) {
return res;
}
/* XXX Momentary period of extreme danger, Will Robinson.
* Removed ap_os_canonical_filename. Anybody munging the
* r->filename better have pre-canonicalized the name that
* they just changed. Since the two most key functions
* in the entire server, ap_server_root_relative() and
* ap_make_full_path now canonicalize as they go.
*
* To be very safe, the server is in hyper-paranoid mode.
* That means that non-canonical paths will be captured and
* denied. This is very cpu/fs intensive, we need to finish
* auditing, and remove the paranoia trigger.
*/
if (r->filename == r->canonical_filename)
#ifdef NO_LONGER_PARANOID
test_filename = apr_pstrdup(r->pool, r->filename);
#else
{
if (apr_filepath_merge(&test_filename, "", r->filename,
APR_FILEPATH_NOTRELATIVE | APR_FILEPATH_TRUENAME,
r->pool) != APR_SUCCESS
|| strcmp(test_filename, r->filename) != 0) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Module bug? Filepath: %s is not the canonical %s",
r->filename, test_filename);
return HTTP_FORBIDDEN;
}
}
#endif
else {
/* Apparently, somebody didn't know to update r->canonical_filename
* which is lucky, since they didn't canonicalize r->filename either.
*/
if (apr_filepath_merge(&test_filename, NULL, r->filename,
APR_FILEPATH_NOTRELATIVE | APR_FILEPATH_TRUENAME,
r->pool) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Module bug? Filepath: %s is not an absolute path",
r->filename);
return HTTP_FORBIDDEN;
}
if (strcmp(r->filename, test_filename) != 0)
r->filename = apr_pstrdup(r->pool, test_filename);
r->canonical_filename = r->filename;
}
num_dirs = ap_count_dirs(test_filename);
if ((res = check_safe_file(r))) {
return res;
}
test_filename_len = strlen(test_filename);
if (test_filename[test_filename_len - 1] == '/')
--num_dirs;
if (r->finfo.filetype == APR_DIR)
++num_dirs;
/*
* We will use test_dirname as scratch space while we build directory
* names during the walk. Profiling shows directory_walk to be a busy
* function so we try to avoid allocating lots of extra memory here.
* We need 2 extra bytes, one for trailing \0 and one because
* make_dirstr_prefix will add potentially one extra /.
*/
test_dirname = apr_palloc(r->pool, test_filename_len + 2);
/* XXX The garbage below disappears in the new directory_walk;
*/
#if defined(HAVE_UNC_PATHS)
/* If the name is a UNC name, then do not perform any true file test
* against the machine name (start at //machine/share/)
* This is optimized to use the normal walk (skips the redundant '/' root)
*/
if (num_dirs > 3 && test_filename[0] == '/' && test_filename[1] == '/')
iStart = 4;
#endif
#if defined(NETWARE)
/* If the name is a fully qualified volume name, then do not perform any
* true file test on the machine name (start at machine/share:/)
* XXX: The implementation eludes me at this moment...
* Does this make sense? Please test!
*/
if (num_dirs > 1 && strchr(test_filename, '/') < strchr(test_filename, ':'))
iStart = 2;
#endif
/* i keeps track of how many segments we are testing
* j keeps track of which section we're on, see core_reorder_directories
*/
j = 0;
for (i = 1; i <= num_dirs; ++i) {
int overrides_here;
core_dir_config *core_dir = ap_get_module_config(per_dir_defaults,
&core_module);
/*
* XXX: this could be made faster by only copying the next component
* rather than copying the entire thing all over.
*/
ap_make_dirstr_prefix(test_dirname, test_filename, i);
/*
* Do symlink checks first, because they are done with the
* permissions appropriate to the *parent* directory...
*/
/* Test only real names (after the root) against the real filesystem */
if ((i > iStart) && (res = check_symlinks(test_dirname, core_dir->opts, r->pool))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Symbolic link not allowed: %s", test_dirname);
return res;
}
/*
* Begin *this* level by looking for matching <Directory> sections
* from access.conf.
*/
for (; j < num_sec; ++j) {
char *entry_dir;
entry_config = sec_dir[j];
entry_core = ap_get_module_config(entry_config, &core_module);
entry_dir = entry_core->d;
if (entry_core->r || entry_core->d_components > i)
break;
this_conf = NULL;
/* We will always add in '0' element components, e.g. plain old
* <Directory >, and <Directory "/"> is classified as zero
* so that Win32/Netware/OS2 etc all pick that up.
*/
if (!entry_core->d_components) {
this_conf = entry_config;
}
else if (entry_core->d_is_fnmatch) {
if (!apr_fnmatch(entry_dir, test_dirname, FNM_PATHNAME)) {
this_conf = entry_config;
}
}
else if (!strcmp(test_dirname, entry_dir))
this_conf = entry_config;
if (this_conf) {
per_dir_defaults = ap_merge_per_dir_configs(r->pool,
per_dir_defaults,
this_conf);
core_dir = ap_get_module_config(per_dir_defaults,
&core_module);
}
}
overrides_here = core_dir->override;
/* If .htaccess files are enabled, check for one. */
/* Test only legal names against the real filesystem */
if ((i >= iStart) && overrides_here) {
ap_conf_vector_t *htaccess_conf = NULL;
res = ap_parse_htaccess(&htaccess_conf, r, overrides_here,
apr_pstrdup(r->pool, test_dirname),
sconf->access_name);
if (res)
return res;
if (htaccess_conf) {
per_dir_defaults = ap_merge_per_dir_configs(r->pool,
per_dir_defaults,
htaccess_conf);
r->per_dir_config = per_dir_defaults;
}
}
}
/*
* Now we'll deal with the regexes.
*/
for (; j < num_sec; ++j) {
entry_config = sec_dir[j];
entry_core = ap_get_module_config(entry_config, &core_module);
if (!entry_core->r) {
continue;
}
if (!ap_regexec(entry_core->r, test_dirname, 0, NULL, REG_NOTEOL)) {
per_dir_defaults = ap_merge_per_dir_configs(r->pool,
per_dir_defaults,
entry_config);
}
}
r->per_dir_config = per_dir_defaults;
/*
* Symlink permissions are determined by the parent. If the request is
* for a directory then applying the symlink test here would use the
* permissions of the directory as opposed to its parent. Consider a
* symlink pointing to a dir with a .htaccess disallowing symlinks. If
* you access /symlink (or /symlink/) you would get a 403 without this
* APR_DIR test. But if you accessed /symlink/index.html, for example,
* you would *not* get the 403.
*/
if (r->finfo.filetype != APR_DIR
&& (res = check_symlinks(r->filename, ap_allow_options(r), r->pool))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Symbolic link not allowed: %s", r->filename);
return res;
}
return OK; /* Can only "fail" if access denied by the
* symlink goop. */
}
#else /* defined REPLACE_PATH_INFO_METHOD */
/*****************************************************************
*
* 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)
{
core_server_config *sconf = ap_get_module_config(r->server->module_config,
&core_module);
ap_conf_vector_t *per_dir_defaults = r->server->lookup_defaults;
ap_conf_vector_t **sec_ent = (ap_conf_vector_t **) sconf->sec_dir->elts;
int num_sec = sconf->sec_dir->nelts;
int sec_idx;
unsigned int seg, startseg;
int res;
ap_conf_vector_t *entry_config;
core_dir_config *entry_core;
apr_status_t rv;
apr_size_t buflen;
char *seg_name;
char *delim;
/*
* XXX: Better (faster) tests needed!!!
*
* Are we dealing with a file? If not, the handler needed to register
* a hook to escape from our walking the file. Since they haven't, we
* are going to assume the worst and refuse to proceed.
*/
if (r->filename == NULL || !ap_os_is_path_absolute(r->pool, r->filename)) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Module bug? Request filename path %s is missing or "
"or not absolute for uri %s",
r->filename ? r->filename : "<NULL>", r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
/*
* 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. If either of these things fails, we could poke
* around, see why, and adjust the lookup_rec accordingly --- this might
* save us a call to get_path_info (with the attendant stat()s); however,
* for the moment, that's not worth the trouble.
*
* r->path_info tracks the remaining source path.
* r->filename tracks the path as we build it.
* we begin our adventure at the root...
*/
r->path_info = r->filename;
if ((rv = apr_filepath_merge(&r->path_info, NULL, r->filename,
APR_FILEPATH_NOTRELATIVE, r->pool))
== APR_SUCCESS) {
char *buf;
rv = apr_filepath_root(&r->filename, &r->path_info,
APR_FILEPATH_TRUENAME, r->pool);
buflen = strlen(r->filename) + strlen(r->path_info) + 1;
buf = apr_palloc(r->pool, buflen);
strcpy (buf, r->filename);
r->filename = buf;
r->finfo.valid = APR_FINFO_TYPE;
r->finfo.filetype = APR_DIR; /* It's the root, of course it's a dir */
} else {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Config bug? Request filename path %s is invalid or "
"or not absolute for uri %s",
r->filename, r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
/*
* 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 = seg = ap_count_dirs(r->filename);
sec_idx = 0;
do {
int overrides_here;
core_dir_config *core_dir = ap_get_module_config(per_dir_defaults,
&core_module);
/* We have no trailing slash, but we sure would appreciate one...
*/
if (sec_idx && r->filename[strlen(r->filename)-1] != '/')
strcat(r->filename, "/");
/* Begin *this* level by looking for matching <Directory> sections
* from the server config.
*/
for (; sec_idx < num_sec; ++sec_idx) {
const char *entry_dir;
entry_config = sec_ent[sec_idx];
entry_core = ap_get_module_config(entry_config, &core_module);
entry_dir = entry_core->d;
/* 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_is_fnmatch
? (apr_fnmatch(entry_dir, r->filename, FNM_PATHNAME) != APR_SUCCESS)
: (strcmp(r->filename, entry_dir) != 0))) {
continue;
}
per_dir_defaults = ap_merge_per_dir_configs(r->pool,
per_dir_defaults,
entry_config);
core_dir = ap_get_module_config(per_dir_defaults,
&core_module);
}
overrides_here = core_dir->override;
/* If .htaccess files are enabled, check for one. */
if (overrides_here) {
ap_conf_vector_t *htaccess_conf = NULL;
res = ap_parse_htaccess(&htaccess_conf, r, overrides_here,
apr_pstrdup(r->pool, r->filename),
sconf->access_name);
if (res)
return res;
if (htaccess_conf) {
per_dir_defaults = ap_merge_per_dir_configs(r->pool,
per_dir_defaults,
htaccess_conf);
r->per_dir_config = per_dir_defaults;
}
}
/* That temporary trailing slash was useful, now drop it.
*/
if (seg > startseg)
r->filename[strlen(r->filename) - 1] = '\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 = strchr(r->filename, '\0');
delim = strchr(r->path_info + (*r->path_info == '/' ? 1 : 0), '/');
if (delim) {
*delim = '\0';
strcpy(seg_name, r->path_info);
r->path_info = delim;
*delim = '/';
}
else {
strcpy(seg_name, r->path_info);
r->path_info = strchr(r->path_info, '\0');
}
if (*seg_name == '/')
++seg_name;
/* If nothing remained but a '/' string, we are finished
*/
if (!*seg_name)
break;
/* XXX: Optimization required:
* If...we have allowed symlinks, and
* if...we find the segment exists in the directory list
* skip the lstat and dummy up an APR_DIR value for r->finfo
* this means case sensitive platforms go quite quickly.
* Case insensitive platforms might be given the wrong path,
* but if it's not found in the cache, then we know we have
* something to test (the misspelling is never cached.)
*/
/* We choose apr_lstat here, rather that 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 case.
*/
rv = apr_lstat(&r->finfo, r->filename, APR_FINFO_MIN | APR_FINFO_NAME, r->pool);
if (APR_STATUS_IS_ENOENT(rv)) {
/* Nothing? That could be nice. But our directory walk is done.
*/
r->finfo.filetype = APR_NOFILE;
break;
}
else if (APR_STATUS_IS_EACCES(rv)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"access to %s denied", r->uri);
return r->status = HTTP_FORBIDDEN;
}
else if ((rv != APR_SUCCESS && rv != APR_INCOMPLETE)
|| !(r->finfo.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,
"access to %s failed", r->uri);
return r->status = HTTP_FORBIDDEN;
}
else if ((res = check_safe_file(r))) {
r->status = res;
return res;
}
/* Fix up the path now if we have a name, and they don't agree
*/
if ((r->finfo.valid & APR_FINFO_NAME)
&& strcmp(seg_name, r->finfo.name)) {
/* TODO: provide users an option that an internal/external
* redirect is required here?
*/
strcpy(seg_name, r->finfo.name);
}
if (r->finfo.filetype == APR_LNK)
{
/* Is this an possibly acceptable symlink?
*/
if ((res = resolve_symlink(r->filename, &r->finfo,
core_dir->opts, r->pool)) != OK) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"Symbolic link not allowed: %s", r->filename);
return r->status = res;
}
/* Ok, we are done with the link's info, test the real target
*/
if (r->finfo.filetype == APR_REG) {
/* That was fun, nothing left for us here
*/
break;
}
else if (r->finfo.filetype != APR_DIR) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"symlink doesn't point to a file or directory: %s",
r->filename);
return r->status = HTTP_FORBIDDEN;
}
}
++seg;
} while (r->finfo.filetype == APR_DIR);
/*
* Now we'll deal with the regexes.
*/
for (; sec_idx < num_sec; ++sec_idx) {
entry_config = sec_ent[sec_idx];
entry_core = ap_get_module_config(entry_config, &core_module);
if (!entry_core->r) {
continue;
}
if (!ap_regexec(entry_core->r, r->filename, 0, NULL, REG_NOTEOL)) {
per_dir_defaults = ap_merge_per_dir_configs(r->pool,
per_dir_defaults,
entry_config);
}
}
r->per_dir_config = per_dir_defaults;
/* It seems this shouldn't be needed anymore. We translated the symlink above
x into a real resource, and should have died up there. Even if we keep this,
x it needs more thought (maybe an r->file_is_symlink) perhaps it should actually
x happen in file_walk, so we catch more obscure cases in autoindex sub requests, 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), r->pool))) {
x ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
x "Symbolic link not allowed: %s", r->filename);
x return res;
x }
*/
return OK; /* 'no excuses' */
}
#endif /* defined REPLACE_PATH_INFO_METHOD */
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 *per_dir_result; /* per_dir_config += walked result */
apr_array_header_t *walked; /* The list of walk_walked_t results */
} walk_cache_t;
AP_DECLARE(int) ap_location_walk(request_rec *r)
{
ap_conf_vector_t *now_merged = NULL;
core_server_config *sconf = ap_get_module_config(r->server->module_config,
&core_module);
ap_conf_vector_t **locations = (ap_conf_vector_t **) sconf->sec_url->elts;
int num_loc = sconf->sec_url->nelts;
core_dir_config *entry_core;
walk_cache_t *cache;
walk_walked_t *last_walk;
const char *entry_uri;
int len, j;
/* Find the most relevant, recent entry to work from. That would be
* this request (on the second call), or the parent request of a
* subrequest, or the prior request of an internal redirect.
*/
if ((apr_pool_userdata_get((void **)&cache,
"ap_location_walk::cache", r->pool)
!= APR_SUCCESS) || !cache)
{
if ((r->main && (apr_pool_userdata_get((void **)&cache,
"ap_location_walk::cache",
r->main->pool)
== APR_SUCCESS) && cache)
|| (r->prev && (apr_pool_userdata_get((void **)&cache,
"ap_location_walk::cache",
r->prev->pool)
== APR_SUCCESS) && cache)) {
cache = apr_pmemdup(r->pool, cache, sizeof(*cache));
cache->walked = apr_array_copy(r->pool, cache->walked);
}
else {
cache = apr_pcalloc(r->pool, sizeof(*cache));
cache->walked = apr_array_make(r->pool, 4, sizeof(walk_walked_t));
}
apr_pool_userdata_set(cache, "ap_location_walk::cache",
apr_pool_cleanup_null, r->pool);
}
/* If the initial request creation logic failed to reset the
* per_dir_config, we will do so here.
* ### at this time, only subreq creation fails to do so.
*/
if (!r->per_dir_config)
r->per_dir_config = r->server->lookup_defaults;
/* No tricks here, there are no <Locations > to parse in this vhost.
* We cache NULL because it's possible that another vhost had some
* different locations, and we are throwing those away.
*/
if (!num_loc) {
return OK;
}
/* Location and LocationMatch differ on their behaviour w.r.t. multiple
* slashes. Location matches multiple slashes with a single slash,
* LocationMatch doesn't. An exception, for backwards brokenness is
* absoluteURIs... in which case neither match multiple slashes.
*/
if (r->uri[0] != '/') {
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 (cache->cached && (cache->dir_conf_tested == locations)
&& (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 (cache->per_dir_result == r->per_dir_config)
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 matches = cache->walked->nelts;
last_walk = (walk_walked_t*)cache->walked->elts;
cache->cached = entry_uri;
cache->dir_conf_tested = locations;
/* 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 (j = 0; j < num_loc; ++j) {
entry_core = ap_get_module_config(locations[j], &core_module);
entry_uri = entry_core->d;
len = strlen(entry_uri);
/* 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
? ap_regexec(entry_core->r, r->uri, 0, NULL, 0)
: (entry_core->d_is_fnmatch
? apr_fnmatch(entry_uri, cache->cached, FNM_PATHNAME)
: (strncmp(cache->cached, entry_uri, len)
|| (entry_uri[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 == locations[j]) {
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;
}
if (now_merged)
now_merged = ap_merge_per_dir_configs(r->pool,
now_merged,
locations[j]);
else
now_merged = locations[j];
last_walk = (walk_walked_t*)apr_array_push(cache->walked);
last_walk->matched = locations[j];
last_walk->merged = now_merged;
}
/* Whoops - everything matched in sequence, but the original walk
* found some additional matches. Truncate them.
*/
if (matches)
cache->walked->nelts -= matches;
}
/* 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)
{
core_dir_config *conf = ap_get_module_config(r->per_dir_config,
&core_module);
ap_conf_vector_t *per_dir_defaults = r->per_dir_config;
ap_conf_vector_t **file = (ap_conf_vector_t **) conf->sec_file->elts;
int num_files = conf->sec_file->nelts;
char *test_file;
/* get the basename */
test_file = strrchr(r->filename, '/');
if (test_file == NULL) {
test_file = r->filename;
}
else {
++test_file;
}
/* Go through the file entries, and check for matches. */
if (num_files) {
ap_conf_vector_t *this_conf;
ap_conf_vector_t *entry_config;
core_dir_config *entry_core;
char *entry_file;
int j;
/* we apply the directive sections in some order;
* should really try them with the most general first.
*/
for (j = 0; j < num_files; ++j) {
entry_config = file[j];
entry_core = ap_get_module_config(entry_config, &core_module);
entry_file = entry_core->d;
this_conf = NULL;
if (entry_core->r) {
if (!ap_regexec(entry_core->r, test_file, 0, NULL, 0))
this_conf = entry_config;
}
else if (entry_core->d_is_fnmatch) {
if (!apr_fnmatch(entry_file, test_file, FNM_PATHNAME)) {
this_conf = entry_config;
}
}
else if (!strcmp(test_file, entry_file)) {
this_conf = entry_config;
}
if (this_conf)
per_dir_defaults = ap_merge_per_dir_configs(r->pool,
per_dir_defaults,
this_conf);
}
r->per_dir_config = per_dir_defaults;
}
return OK;
}
/*****************************************************************
*
* 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)
{
apr_pool_t *rrp;
request_rec *rr;
apr_pool_create(&rrp, r->pool);
rr = apr_pcalloc(rrp, sizeof(request_rec));
rr->pool = rrp;
return rr;
}
static void fill_in_sub_req_vars(request_rec *rnew, const request_rec *r,
ap_filter_t *next_filter)
{
rnew->hostname = r->hostname;
rnew->request_time = r->request_time;
rnew->connection = r->connection;
rnew->server = r->server;
rnew->request_config = ap_create_request_config(rnew->pool);
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) {
rnew->output_filters = next_filter;
}
else {
rnew->output_filters = r->output_filters;
}
ap_add_output_filter("SUBREQ_CORE", NULL, rnew, rnew->connection);
/* no input filters for a subrequest */
ap_set_sub_req_protocol(rnew, r);
}
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);
}
return ap_pass_brigade(f->next, bb);
}
AP_DECLARE(int) ap_some_auth_required(request_rec *r)
{
/* Is there a require line configured for the type of *this* req? */
const apr_array_header_t *reqs_arr = ap_requires(r);
require_line *reqs;
int i;
if (!reqs_arr)
return 0;
reqs = (require_line *) reqs_arr->elts;
for (i = 0; i < reqs_arr->nelts; ++i)
if (reqs[i].method_mask & (AP_METHOD_BIT << r->method_number))
return 1;
return 0;
}
AP_DECLARE(request_rec *) ap_sub_req_method_uri(const char *method,
const char *new_file,
const request_rec *r,
ap_filter_t *next_filter)
{
request_rec *rnew;
int res;
char *udir;
rnew = make_sub_request(r);
fill_in_sub_req_vars(rnew, r, next_filter);
rnew->per_dir_config = r->server->lookup_defaults;
/* We have to run this after fill_in_sub_req_vars, or the r->main
* pointer won't be setup
*/
ap_run_create_request(rnew);
/* 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_file[0] == '/')
ap_parse_uri(rnew, new_file);
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_file));
}
if ((res = ap_process_request_internal(rnew))) {
rnew->status = res;
}
return rnew;
}
AP_DECLARE(request_rec *) ap_sub_req_lookup_uri(const char *new_file,
const request_rec *r,
ap_filter_t *next_filter)
{
return ap_sub_req_method_uri("GET", new_file, r, next_filter);
}
AP_DECLARE(request_rec *) ap_sub_req_lookup_dirent(const apr_finfo_t *dirent,
const request_rec *r,
ap_filter_t *next_filter)
{
request_rec *rnew;
int res;
char *fdir;
char *udir;
rnew = make_sub_request(r);
fill_in_sub_req_vars(rnew, r, next_filter);
rnew->chunked = r->chunked;
/* We have to run this after fill_in_sub_req_vars, or the r->main
* pointer won't be setup
*/
ap_run_create_request(rnew);
fdir = ap_make_dirstr_parent(rnew->pool, r->filename);
/*
* Special case: we are looking at a relative lookup in the same directory.
* That means we won't have to redo directory_walk, and we may
* not even have to redo access checks.
*/
udir = ap_make_dirstr_parent(rnew->pool, r->uri);
/* This is 100% safe, since dirent->name just came from the filesystem */
rnew->uri = ap_make_full_path(rnew->pool, udir, dirent->name);
rnew->filename = ap_make_full_path(rnew->pool, fdir, dirent->name);
if (r->canonical_filename == r->filename)
rnew->canonical_filename = rnew->filename;
ap_parse_uri(rnew, rnew->uri); /* fill in parsed_uri values */
#if 0 /* XXX When this is reenabled, the cache triggers need to be set to faux
* dir_walk/file_walk values.
*/
rnew->per_dir_config = r->per_dir_config;
if ((dirent->valid & APR_FINFO_MIN) != APR_FINFO_MIN) {
/*
* apr_dir_read isn't very complete on this platform, so
* we need another apr_lstat (or simply apr_stat if 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 = 0;
}
else
if (((rv = apr_lstat(&rnew->finfo, rnew->filename,
APR_FINFO_MIN, rnew->pool)) != APR_SUCCESS)
&& (rv != APR_INCOMPLETE))
rnew->finfo.filetype = 0;
}
else {
memcpy (&rnew->finfo, dirent, sizeof(apr_finfo_t));
}
if ((res = check_safe_file(rnew))) {
rnew->status = res;
return rnew;
}
if (rnew->finfo.filetype == APR_LNK
&& (res = resolve_symlink(rnew->filename, &rnew->finfo,
ap_allow_options(rnew), rnew->pool)) != OK) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, rnew,
"Symbolic link not allowed: %s", rnew->filename);
rnew->status = res;
return rnew;
}
/*
* no matter what, if it's a subdirectory, we need to re-run
* directory_walk
*/
if (rnew->finfo.filetype == APR_DIR) {
if (!(res = ap_directory_walk(rnew)))
if (!(res = ap_file_walk(rnew)))
res = ap_location_walk(rnew);
}
else if (rnew->finfo.filetype == APR_REG || !rnew->finfo.filetype) {
/*
* do a file_walk, if it doesn't change the per_dir_config then
* we know that we don't have to redo all the access checks
*/
if ( !(res = ap_file_walk(rnew))
&& !(res = ap_location_walk(rnew))
&& (rnew->per_dir_config == r->per_dir_config))
{
if ( (res = ap_run_type_checker(rnew))
|| (res = ap_run_fixups(rnew))) {
rnew->status = res;
}
return rnew;
}
}
#endif
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);
fill_in_sub_req_vars(rnew, r, next_filter);
/* XXX Either this is needed for all subreq types (move into
* fill_in_sub_req_vars), or it isn't needed at all.
* WHICH IS IT?
*/
rnew->chunked = r->chunked;
/* We have to run this after fill_in_sub_req_vars, or the r->main
* pointer won't be setup
*/
ap_run_create_request(rnew);
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. That means we won't have to redo
* directory_walk, and we may not even have to redo access checks.
* ### Someday we don't even have to redo the entire directory walk,
* either, if the base paths match, we can pick up where we leave off.
*/
if (strncmp(rnew->filename, fdir, fdirlen) == 0
&& rnew->filename[fdirlen]
&& ap_strchr_c(rnew->filename + fdirlen, '/') == NULL)
{
char *udir = ap_make_dirstr_parent(rnew->pool, r->uri);
rnew->uri = ap_make_full_path(rnew->pool, udir, new_file);
ap_parse_uri(rnew, rnew->uri); /* fill in parsed_uri values */
#if 0 /* XXX When this is reenabled, the cache triggers need to be set to faux
* dir_walk/file_walk values.
*/
rnew->per_dir_config = r->per_dir_config;
/*
* If this is an APR_LNK that resolves to an APR_DIR, then
* we will rerun everything anyways... this should be safe.
*/
if (ap_allow_options(rnew) & OPT_SYM_LINKS) {
apr_status_t rv;
if (((rv = apr_stat(&rnew->finfo, rnew->filename,
APR_FINFO_MIN, rnew->pool)) != APR_SUCCESS)
&& (rv != APR_INCOMPLETE))
rnew->finfo.filetype = 0;
}
else {
apr_status_t rv;
if (((rv = apr_lstat(&rnew->finfo, rnew->filename,
APR_FINFO_MIN, rnew->pool)) != APR_SUCCESS)
&& (rv != APR_INCOMPLETE))
rnew->finfo.filetype = 0;
}
if ((res = check_safe_file(rnew))) {
rnew->status = res;
return rnew;
}
if (rnew->finfo.filetype == APR_LNK
&& (res = resolve_symlink(rnew->filename, &rnew->finfo,
ap_allow_options(rnew), rnew->pool)) != OK) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, rnew,
"Symbolic link not allowed: %s", rnew->filename);
rnew->status = res;
return rnew;
}
/*
* no matter what, if it's a subdirectory, we need to re-run
* directory_walk
*/
if (rnew->finfo.filetype == APR_DIR) {
if (!(res = ap_directory_walk(rnew)))
if (!(res = ap_file_walk(rnew)))
res = ap_location_walk(rnew);
}
else if (rnew->finfo.filetype == APR_REG || !rnew->finfo.filetype) {
/*
* do a file_walk, if it doesn't change the per_dir_config then
* we know that we don't have to redo all the access checks
*/
if ( !(res = ap_file_walk(rnew))
&& !(res = ap_location_walk(rnew))
&& (rnew->per_dir_config == r->per_dir_config))
{
if ( (res = ap_run_type_checker(rnew))
|| (res = ap_run_fixups(rnew))) {
rnew->status = res;
}
return rnew;
}
}
else {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, rnew,
"symlink doesn't point to a file or directory: %s",
r->filename);
res = HTTP_FORBIDDEN;
}
#endif
}
else {
/* XXX: @@@: What should be done with the parsed_uri values? */
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, "");
#if 0 /* XXX When this is reenabled, the cache triggers need to be set to faux
* dir_walk/file_walk values.
*/
rnew->per_dir_config = r->server->lookup_defaults;
res = ap_directory_walk(rnew);
if (!res) {
res = ap_file_walk(rnew);
}
#endif
}
if ((res = ap_process_request_internal(rnew))) {
rnew->status = res;
}
return rnew;
}
AP_DECLARE(int) ap_run_sub_req(request_rec *r)
{
int retval;
retval = ap_invoke_handler(r);
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 */
}
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