/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 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.
*
*/
#define CORE_PRIVATE
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_conf_globals.h" /* for ap_extended_status */
#include "http_log.h"
#include "http_main.h"
#include "scoreboard.h"
#include "fnmatch.h"
/*****************************************************************
*
* 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.st_mode == 0 /* doesn't exist */
|| S_ISDIR(r->finfo.st_mode)
|| S_ISREG(r->finfo.st_mode)
|| S_ISLNK(r->finfo.st_mode)) {
return OK;
}
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"object is not a file, directory or symlink: %s",
r->filename);
return HTTP_FORBIDDEN;
}
static int check_symlinks(char *d, int opts)
{
#if defined(OS2) || defined(WIN32) || defined(NETWARE)
/* OS/2 doesn't have symlinks */
return OK;
#else
struct stat 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 = lstat(d, &lfi);
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 >= 0) || !S_ISLNK(lfi.st_mode))
return OK;
/* OK, it's a symlink. May still be OK with OPT_SYM_OWNER */
if (!(opts & OPT_SYM_OWNER))
return HTTP_FORBIDDEN;
if (stat(d, &fi) < 0)
return HTTP_FORBIDDEN;
return (fi.st_uid == lfi.st_uid) ? 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.st_mode) {
/* 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 (strlen(path) > 2 && path[0] == '/' && path[1] == '/' &&
path[2] != '/' && cp[-1] == '/') {
char *p;
int iCount=0;
p = path;
while (p = strchr(p,'/')) {
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 must not stat() filenames that may cause os-specific system
* problems, such as "/file/aux" on DOS-abused filesystems.
* So pretend that they do not exist by returning an ENOENT error.
* This will force us to drop that part of the path and keep
* looking back for a "real" file that exists, while still allowing
* the "invalid" path parts within the PATH_INFO.
*/
if (!ap_os_is_filename_valid(path)) {
errno = ENOENT;
rv = -1;
}
else {
errno = 0;
rv = stat(path, &r->finfo);
#ifdef OS2
r->finfo.st_ino = 0;
#endif
}
if (cp != end)
*cp = '/';
if (!rv) {
/*
* 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 (S_ISDIR(r->finfo.st_mode) && last_cp) {
r->finfo.st_mode = 0; /* No such file... */
cp = last_cp;
}
r->path_info = ap_pstrdup(r->pool, cp);
*cp = '\0';
return OK;
}
/* must set this to zero, some stat()s may have corrupted it
* even if they returned an error.
*/
r->finfo.st_mode = 0;
#if defined(ENOENT) && defined(ENOTDIR)
if (errno == ENOENT || errno == ENOTDIR) {
last_cp = cp;
while (--cp > path && *cp != '/')
continue;
while (cp > path && cp[-1] == '/')
--cp;
}
else {
#if defined(EACCES)
if (errno != EACCES)
#endif
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"access to %s failed", r->uri);
return HTTP_FORBIDDEN;
}
#else
#error ENOENT || ENOTDIR not defined; please see the
#error comments at this line in the source for a workaround.
/*
* If ENOENT || ENOTDIR is not defined in one of the your OS's
* include files, Apache does not know how to check to see why the
* stat() of the index file failed; there are cases where it can fail
* even though the file exists. This means that it is possible for
* someone to get a directory listing of a directory even though
* there is an index (eg. index.html) file in it. If you do not have
* a problem with this, delete the above #error lines and start the
* compile again. If you need to do this, please submit a bug report
* from http://www.apache.org/bug_report.html letting us know that
* you needed to do this. Please be sure to include the operating
* system you are using.
*/
last_cp = cp;
while (--cp > path && *cp != '/')
continue;
while (cp > path && cp[-1] == '/')
--cp;
#endif /* ENOENT && ENOTDIR */
}
return OK;
}
static int directory_walk(request_rec *r)
{
core_server_config *sconf = ap_get_module_config(r->server->module_config,
&core_module);
void *per_dir_defaults = r->server->lookup_defaults;
void **sec = (void **) sconf->sec->elts;
int num_sec = sconf->sec->nelts;
char *test_filename;
char *test_dirname;
int res;
unsigned i, num_dirs;
int j, test_filename_len;
#if defined(HAVE_UNC_PATHS) || defined(NETWARE)
unsigned iStart = 1;
#endif
/*
* Are we dealing with a file? If not, we can (hopefuly) safely assume we
* have a handler that doesn't require one, but for safety's sake, and so
* we have something find_types() can get something out of, fake one. But
* don't run through the directory entries.
*/
if (r->filename == NULL) {
r->filename = ap_pstrdup(r->pool, r->uri);
r->finfo.st_mode = 0; /* Not really a file... */
r->per_dir_config = per_dir_defaults;
return OK;
}
/*
* 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.
*
* Fake filenames (i.e. proxy:) only match Directory sections.
*/
if (!ap_os_is_path_absolute(r->filename))
{
void *this_conf, *entry_config;
core_dir_config *entry_core;
char *entry_dir;
for (j = 0; j < num_sec; ++j) {
entry_config = sec[j];
entry_core = (core_dir_config *)
ap_get_module_config(entry_config, &core_module);
entry_dir = entry_core->d;
this_conf = NULL;
if (entry_core->r) {
if (!ap_regexec(entry_core->r, r->filename, 0, NULL, 0))
this_conf = entry_config;
}
else if (entry_core->d_is_fnmatch) {
if (!ap_fnmatch(entry_dir, r->filename, 0))
this_conf = entry_config;
}
else if (!strncmp(r->filename, entry_dir, strlen(entry_dir)))
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;
}
r->filename = ap_os_case_canonical_filename(r->pool, r->filename);
res = get_path_info(r);
if (res != OK) {
return res;
}
r->case_preserved_filename = r->filename;
r->filename = ap_os_canonical_filename(r->pool, r->filename);
test_filename = ap_pstrdup(r->pool, r->filename);
ap_no2slash(test_filename);
num_dirs = ap_count_dirs(test_filename);
if (!ap_os_is_filename_valid(r->filename) &&
!(r->method_number == M_OPTIONS && !strcmp(r->uri, "*"))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Filename is not valid: %s", r->filename);
return HTTP_FORBIDDEN;
}
if ((res = check_safe_file(r))) {
return res;
}
test_filename_len = strlen(test_filename);
if (test_filename[test_filename_len - 1] == '/')
--num_dirs;
if (S_ISDIR(r->finfo.st_mode))
++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 = ap_palloc(r->pool, test_filename_len + 2);
#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
#if defined(HAVE_DRIVE_LETTERS) || defined(NETWARE)
/* Should match <Directory> sections starting from '/', not 'e:/'
* (for example). WIN32/OS2/NETWARE do not have a single root directory,
* they have one for each filesystem. Traditionally, Apache has treated
* <Directory /> permissions as the base for the whole server, and this
* tradition should probably be preserved.
*
* NOTE: MUST SYNC WITH ap_make_dirstr_prefix() CHANGE IN src/main/util.c
*/
if (test_filename[0] == '/')
i = 1;
else
i = 0;
#else
/* Normal File Systems are rooted at / */
i = 1;
#endif /* def HAVE_DRIVE_LETTERS || NETWARE */
/* j keeps track of which section we're on, see core_reorder_directories */
j = 0;
for (; i <= num_dirs; ++i) {
int overrides_here;
core_dir_config *core_dir = (core_dir_config *)
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...
*/
#if defined(HAVE_UNC_PATHS) || defined(NETWARE)
/* Test only legal names against the real filesystem */
if (i >= iStart)
#endif
if ((res = check_symlinks(test_dirname, core_dir->opts))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 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) {
void *entry_config = sec[j];
core_dir_config *entry_core;
char *entry_dir;
void *this_conf;
entry_core = (core_dir_config *)
ap_get_module_config(entry_config, &core_module);
entry_dir = entry_core->d;
if (entry_core->r
|| !ap_os_is_path_absolute(entry_dir)
#if defined(HAVE_DRIVE_LETTERS) || defined(NETWARE)
/* To account for the top-level "/" directory when i == 0
* XXX: I think the net test is wrong... may fail ap_os_is_path_absolute
*/
|| (entry_core->d_components > 1
&& entry_core->d_components > i))
#else
|| entry_core->d_components > i)
#endif /* def HAVE_DRIVE_LETTERS || NETWARE */
break;
this_conf = NULL;
if (entry_core->d_is_fnmatch) {
if (!ap_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 = (core_dir_config *)
ap_get_module_config(per_dir_defaults, &core_module);
}
#if defined(HAVE_DRIVE_LETTERS) || defined(NETWARE)
/* So that other top-level directory sections (e.g. "e:/") aren't
* skipped when i == 0
* XXX: I don't get you here, Tim... That's a level 1 section, but
* we are at level 0. Did you mean fast-forward to the next?
*/
else if (!i)
break;
#endif /* def HAVE_DRIVE_LETTERS || NETWARE */
}
overrides_here = core_dir->override;
/* If .htaccess files are enabled, check for one. */
#if defined(HAVE_UNC_PATHS) || defined(NETWARE)
/* Test only legal names against the real filesystem */
if (i >= iStart)
#endif
if (overrides_here) {
void *htaccess_conf = NULL;
res = ap_parse_htaccess(&htaccess_conf, r, overrides_here,
ap_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;
}
}
}
/*
* There's two types of IS_SPECIAL sections (see http_core.c), and we've
* already handled the proxy:-style stuff. Now we'll deal with the
* regexes.
*/
for (; j < num_sec; ++j) {
void *entry_config = sec[j];
core_dir_config *entry_core;
entry_core = (core_dir_config *)
ap_get_module_config(entry_config, &core_module);
if (entry_core->r) {
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
* S_ISDIR test. But if you accessed /symlink/index.html, for example,
* you would *not* get the 403.
*/
if (!S_ISDIR(r->finfo.st_mode)
&& (res = check_symlinks(r->filename, ap_allow_options(r)))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Symbolic link not allowed: %s", r->filename);
return res;
}
return OK; /* Can only "fail" if access denied by the
* symlink goop. */
}
static int location_walk(request_rec *r)
{
core_server_config *sconf = ap_get_module_config(r->server->module_config,
&core_module);
void *per_dir_defaults = r->per_dir_config;
void **url = (void **) sconf->sec_url->elts;
int len, num_url = sconf->sec_url->nelts;
char *test_location;
void *this_conf, *entry_config;
core_dir_config *entry_core;
char *entry_url;
int j;
if (!num_url) {
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] != '/') {
test_location = r->uri;
}
else {
test_location = ap_pstrdup(r->pool, r->uri);
ap_no2slash(test_location);
}
/* Go through the location entries, and check for matches. */
/* we apply the directive sections in some order;
* should really try them with the most general first.
*/
for (j = 0; j < num_url; ++j) {
entry_config = url[j];
entry_core = (core_dir_config *)
ap_get_module_config(entry_config, &core_module);
entry_url = entry_core->d;
len = strlen(entry_url);
this_conf = NULL;
if (entry_core->r) {
if (!ap_regexec(entry_core->r, r->uri, 0, NULL, 0))
this_conf = entry_config;
}
else if (entry_core->d_is_fnmatch) {
if (!ap_fnmatch(entry_url, test_location, FNM_PATHNAME)) {
this_conf = entry_config;
}
}
else if (!strncmp(test_location, entry_url, len) &&
(entry_url[len - 1] == '/' ||
test_location[len] == '/' || test_location[len] == '\0'))
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;
}
static int file_walk(request_rec *r)
{
core_dir_config *conf = ap_get_module_config(r->per_dir_config, &core_module);
void *per_dir_defaults = r->per_dir_config;
void **file = (void **) conf->sec->elts;
int num_files = conf->sec->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) {
void *this_conf, *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 = (core_dir_config *)
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 (!ap_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)
{
pool *rrp = ap_make_sub_pool(r->pool);
request_rec *rr = ap_pcalloc(rrp, sizeof(request_rec));
rr->pool = rrp;
#ifdef CHARSET_EBCDIC
/* Assume virgin state (like after reading the request_line): */
ap_bsetflag(r->connection->client, B_ASCII2EBCDIC, rr->ebcdic.conv_in = 1);
ap_bsetflag(r->connection->client, B_EBCDIC2ASCII, rr->ebcdic.conv_out = 1);
#endif
return rr;
}
API_EXPORT(request_rec *) ap_sub_req_method_uri(const char *method,
const char *new_file,
const request_rec *r)
{
request_rec *rnew;
int res;
char *udir;
rnew = make_sub_request(r);
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->per_dir_config = r->server->lookup_defaults;
ap_set_sub_req_protocol(rnew, r);
/* 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));
}
res = ap_unescape_url(rnew->uri);
if (res) {
rnew->status = res;
return rnew;
}
ap_getparents(rnew->uri);
if ((res = location_walk(rnew))) {
rnew->status = res;
return rnew;
}
res = ap_translate_name(rnew);
if (res) {
rnew->status = res;
return rnew;
}
/*
* We could be clever at this point, and avoid calling directory_walk,
* etc. However, we'd need to test that the old and new filenames contain
* the same directory components, so it would require duplicating the
* start of translate_name. Instead we rely on the cache of .htaccess
* results.
*
* NB: directory_walk() clears the per_dir_config, so we don't inherit
* from location_walk() above
*/
if ((res = directory_walk(rnew))
|| (res = file_walk(rnew))
|| (res = location_walk(rnew))
|| ((ap_satisfies(rnew) == SATISFY_ALL
|| ap_satisfies(rnew) == SATISFY_NOSPEC)
? ((res = ap_check_access(rnew))
|| (ap_some_auth_required(rnew)
&& ((res = ap_check_user_id(rnew))
|| (res = ap_check_auth(rnew)))))
: ((res = ap_check_access(rnew))
&& (!ap_some_auth_required(rnew)
|| ((res = ap_check_user_id(rnew))
|| (res = ap_check_auth(rnew)))))
)
|| (res = ap_find_types(rnew))
|| (res = ap_run_fixups(rnew))
) {
rnew->status = res;
}
return rnew;
}
API_EXPORT(request_rec *) ap_sub_req_lookup_uri(const char *new_file,
const request_rec *r)
{
return ap_sub_req_method_uri("GET", new_file, r);
}
API_EXPORT(request_rec *) ap_sub_req_lookup_file(const char *new_file,
const request_rec *r)
{
request_rec *rnew;
int res;
char *fdir;
rnew = make_sub_request(r);
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;
ap_set_sub_req_protocol(rnew, r);
fdir = ap_make_dirstr_parent(rnew->pool, r->filename);
/*
* Check for a special case... if there are no '/' characters in new_file
* at all, 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.
*/
if (strchr(new_file, '/') == NULL) {
char *udir = ap_make_dirstr_parent(rnew->pool, r->uri);
rnew->uri = ap_make_full_path(rnew->pool, udir, new_file);
rnew->filename = ap_make_full_path(rnew->pool, fdir, new_file);
ap_parse_uri(rnew, rnew->uri); /* fill in parsed_uri values */
if (stat(rnew->filename, &rnew->finfo) < 0) {
rnew->finfo.st_mode = 0;
#ifdef ENAMETOOLONG
/* Special case for filenames which exceed the maximum limit
* imposed by the operating system (~1024). These should
* NOT be treated like "file not found", because there is
* a difference between "the file is not there" and
* "the file exists, but you tried to access it using a
* path which exceeds the path length limit".
* The idea here is to handle DoS attacks with long
* runs of //////'s in a graceful and secure manner.
*/
if (errno == ENAMETOOLONG) {
ap_log_rerror(APLOG_MARK, APLOG_CRIT, r,
"Possible DoS attempt? URL=%s", r->filename);
rnew->status = HTTP_FORBIDDEN;
return rnew;
}
#endif
}
if ((res = check_safe_file(rnew))) {
rnew->status = res;
return rnew;
}
rnew->per_dir_config = r->per_dir_config;
/*
* no matter what, if it's a subdirectory, we need to re-run
* directory_walk
*/
if (S_ISDIR(rnew->finfo.st_mode)) {
res = directory_walk(rnew);
if (!res) {
res = file_walk(rnew);
}
}
else {
if ((res = check_symlinks(rnew->filename, ap_allow_options(rnew)))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, rnew,
"Symbolic link not allowed: %s", rnew->filename);
rnew->status = res;
return rnew;
}
/*
* 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 = file_walk(rnew))) {
rnew->status = res;
return rnew;
}
if (rnew->per_dir_config == r->per_dir_config) {
if ((res = ap_find_types(rnew)) || (res = ap_run_fixups(rnew))) {
rnew->status = res;
}
return rnew;
}
}
}
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 = "INTERNALLY GENERATED file-relative req";
rnew->filename = ((ap_os_is_path_absolute(new_file)) ?
ap_pstrdup(rnew->pool, new_file) :
ap_make_full_path(rnew->pool, fdir, new_file));
rnew->per_dir_config = r->server->lookup_defaults;
res = directory_walk(rnew);
if (!res) {
res = file_walk(rnew);
}
}
if (res
|| ((ap_satisfies(rnew) == SATISFY_ALL
|| ap_satisfies(rnew) == SATISFY_NOSPEC)
? ((res = ap_check_access(rnew))
|| (ap_some_auth_required(rnew)
&& ((res = ap_check_user_id(rnew))
|| (res = ap_check_auth(rnew)))))
: ((res = ap_check_access(rnew))
&& (!ap_some_auth_required(rnew)
|| ((res = ap_check_user_id(rnew))
|| (res = ap_check_auth(rnew)))))
)
|| (res = ap_find_types(rnew))
|| (res = ap_run_fixups(rnew))
) {
rnew->status = res;
}
return rnew;
}
API_EXPORT(int) ap_run_sub_req(request_rec *r)
{
int retval = ap_invoke_handler(r);
ap_finalize_sub_req_protocol(r);
return retval;
}
API_EXPORT(void) ap_destroy_sub_req(request_rec *r)
{
#ifdef CHARSET_EBCDIC
if (r->main) {
ap_bsetflag(r->connection->client, B_ASCII2EBCDIC, r->main->ebcdic.conv_in);
ap_bsetflag(r->connection->client, B_EBCDIC2ASCII, r->main->ebcdic.conv_out);
}
#endif
/* Reclaim the space */
ap_destroy_pool(r->pool);
}
/*****************************************************************
*
* Mainline request processing...
*/
API_EXPORT(void) ap_die(int type, request_rec *r)
{
int error_index = ap_index_of_response(type);
char *custom_response = ap_response_code_string(r, error_index);
int recursive_error = 0;
if (type == DONE) {
ap_finalize_request_protocol(r);
return;
}
/*
* The following takes care of Apache redirects to custom response URLs
* Note that if we are already dealing with the response to some other
* error condition, we just report on the original error, and give up on
* any attempt to handle the other thing "intelligently"...
*/
if (r->status != HTTP_OK) {
recursive_error = type;
while (r->prev && (r->prev->status != HTTP_OK))
r = r->prev; /* Get back to original error */
type = r->status;
custom_response = NULL; /* Do NOT retry the custom thing! */
}
r->status = type;
/*
* This test is done here so that none of the auth modules needs to know
* about proxy authentication. They treat it like normal auth, and then
* we tweak the status.
*/
if (r->status == AUTH_REQUIRED && r->proxyreq == STD_PROXY) {
r->status = HTTP_PROXY_AUTHENTICATION_REQUIRED;
}
/*
* If we want to keep the connection, be sure that the request body
* (if any) has been read.
*/
if ((r->status != HTTP_NOT_MODIFIED) && (r->status != HTTP_NO_CONTENT)
&& !ap_status_drops_connection(r->status)
&& r->connection && (r->connection->keepalive != -1)) {
(void) ap_discard_request_body(r);
}
/*
* Two types of custom redirects --- plain text, and URLs. Plain text has
* a leading '"', so the URL code, here, is triggered on its absence
*/
if (custom_response && custom_response[0] != '"') {
if (ap_is_url(custom_response)) {
/*
* The URL isn't local, so lets drop through the rest of this
* apache code, and continue with the usual REDIRECT handler.
* But note that the client will ultimately see the wrong
* status...
*/
r->status = REDIRECT;
ap_table_setn(r->headers_out, "Location", custom_response);
}
else if (custom_response[0] == '/') {
const char *error_notes;
r->no_local_copy = 1; /* Do NOT send USE_LOCAL_COPY for
* error documents! */
/*
* This redirect needs to be a GET no matter what the original
* method was.
*/
ap_table_setn(r->subprocess_env, "REQUEST_METHOD", r->method);
/*
* Provide a special method for modules to communicate
* more informative (than the plain canned) messages to us.
* Propagate them to ErrorDocuments via the ERROR_NOTES variable:
*/
if ((error_notes = ap_table_get(r->notes, "error-notes")) != NULL) {
ap_table_setn(r->subprocess_env, "ERROR_NOTES", error_notes);
}
/*
* If it is already a GET or a HEAD, don't change it
* (method_number for GET and HEAD is the same)
*/
if(r->method_number!=M_GET) {
r->method = ap_pstrdup(r->pool, "GET");
r->method_number = M_GET;
}
ap_internal_redirect(custom_response, r);
return;
}
else {
/*
* Dumb user has given us a bad url to redirect to --- fake up
* dying with a recursive server error...
*/
recursive_error = SERVER_ERROR;
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Invalid error redirection directive: %s",
custom_response);
}
}
ap_send_error_response(r, recursive_error);
}
static void decl_die(int status, char *phase, request_rec *r)
{
if (status == DECLINED) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_CRIT, r,
"configuration error: couldn't %s: %s", phase, r->uri);
ap_die(SERVER_ERROR, r);
}
else
ap_die(status, r);
}
API_EXPORT(int) ap_some_auth_required(request_rec *r)
{
/* Is there a require line configured for the type of *this* req? */
const array_header *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 & (1 << r->method_number))
return 1;
return 0;
}
static void process_request_internal(request_rec *r)
{
int access_status;
/* Ignore embedded %2F's in path for proxy requests */
if (r->proxyreq == NOT_PROXY && r->parsed_uri.path) {
access_status = ap_unescape_url(r->parsed_uri.path);
if (access_status) {
ap_die(access_status, r);
return;
}
}
ap_getparents(r->uri); /* OK --- shrinking transformations... */
if ((access_status = location_walk(r))) {
ap_die(access_status, r);
return;
}
if ((access_status = ap_translate_name(r))) {
decl_die(access_status, "translate", r);
return;
}
if (r->proxyreq == NOT_PROXY) {
/*
* We don't want TRACE to run through the normal handler set, we
* handle it specially.
*/
if (r->method_number == M_TRACE) {
if ((access_status = ap_send_http_trace(r)))
ap_die(access_status, r);
else
ap_finalize_request_protocol(r);
return;
}
}
if (r->proto_num > HTTP_VERSION(1,0) && ap_table_get(r->subprocess_env, "downgrade-1.0")) {
r->proto_num = HTTP_VERSION(1,0);
}
/*
* NB: directory_walk() clears the per_dir_config, so we don't inherit
* from location_walk() above
*/
if ((access_status = directory_walk(r))) {
ap_die(access_status, r);
return;
}
if ((access_status = file_walk(r))) {
ap_die(access_status, r);
return;
}
if ((access_status = location_walk(r))) {
ap_die(access_status, r);
return;
}
if ((access_status = ap_header_parse(r))) {
ap_die(access_status, r);
return;
}
switch (ap_satisfies(r)) {
case SATISFY_ALL:
case SATISFY_NOSPEC:
if ((access_status = ap_check_access(r)) != 0) {
decl_die(access_status, "check access", r);
return;
}
if (ap_some_auth_required(r)) {
if (((access_status = ap_check_user_id(r)) != 0) || !ap_auth_type(r)) {
decl_die(access_status, ap_auth_type(r)
? "check user. No user file?"
: "perform authentication. AuthType not set!", r);
return;
}
if (((access_status = ap_check_auth(r)) != 0) || !ap_auth_type(r)) {
decl_die(access_status, ap_auth_type(r)
? "check access. No groups file?"
: "perform authentication. AuthType not set!", r);
return;
}
}
break;
case SATISFY_ANY:
if (((access_status = ap_check_access(r)) != 0) || !ap_auth_type(r)) {
if (!ap_some_auth_required(r)) {
decl_die(access_status ? access_status :
HTTP_INTERNAL_SERVER_ERROR,
ap_auth_type(r) ? "check access"
: "perform authentication. AuthType not set!", r);
return;
}
if (((access_status = ap_check_user_id(r)) != 0) || !ap_auth_type(r)) {
decl_die(access_status, ap_auth_type(r)
? "check user. No user file?"
: "perform authentication. AuthType not set!", r);
return;
}
if (((access_status = ap_check_auth(r)) != 0) || !ap_auth_type(r)) {
decl_die(access_status, ap_auth_type(r)
? "check access. No groups file?"
: "perform authentication. AuthType not set!", r);
return;
}
}
break;
}
if (! (r->proxyreq != NOT_PROXY
&& r->parsed_uri.scheme != NULL
&& strcmp(r->parsed_uri.scheme, "http") == 0) ) {
if ((access_status = ap_find_types(r)) != 0) {
decl_die(access_status, "find types", r);
return;
}
}
if ((access_status = ap_run_fixups(r)) != 0) {
ap_die(access_status, r);
return;
}
if ((access_status = ap_invoke_handler(r)) != 0) {
ap_die(access_status, r);
return;
}
/* Take care of little things that need to happen when we're done */
ap_finalize_request_protocol(r);
}
API_EXPORT(void) ap_process_request(request_rec *r)
{
int old_stat;
if (ap_extended_status)
ap_time_process_request(r->connection->child_num, START_PREQUEST);
process_request_internal(r);
old_stat = ap_update_child_status(r->connection->child_num,
SERVER_BUSY_LOG, r);
/*
* We want to flush the last packet if this isn't a pipelining connection
* *before* we start into logging. Suppose that the logging causes a DNS
* lookup to occur, which may have a high latency. If we hold off on
* this packet, then it'll appear like the link is stalled when really
* it's the application that's stalled.
*/
ap_bhalfduplex(r->connection->client);
ap_log_transaction(r);
(void) ap_update_child_status(r->connection->child_num, old_stat, r);
if (ap_extended_status)
ap_time_process_request(r->connection->child_num, STOP_PREQUEST);
}
static table *rename_original_env(pool *p, table *t)
{
array_header *env_arr = ap_table_elts(t);
table_entry *elts = (table_entry *) env_arr->elts;
table *new = ap_make_table(p, env_arr->nalloc);
int i;
for (i = 0; i < env_arr->nelts; ++i) {
if (!elts[i].key)
continue;
ap_table_setn(new, ap_pstrcat(p, "REDIRECT_", elts[i].key, NULL),
elts[i].val);
}
return new;
}
static request_rec *internal_internal_redirect(const char *new_uri, request_rec *r)
{
int access_status;
request_rec *new = (request_rec *) ap_pcalloc(r->pool, sizeof(request_rec));
new->connection = r->connection;
new->server = r->server;
new->pool = r->pool;
/*
* A whole lot of this really ought to be shared with http_protocol.c...
* another missing cleanup. It's particularly inappropriate to be
* setting header_only, etc., here.
*/
new->method = r->method;
new->method_number = r->method_number;
ap_parse_uri(new, new_uri);
new->request_config = ap_create_request_config(r->pool);
new->per_dir_config = r->server->lookup_defaults;
new->prev = r;
r->next = new;
/* Inherit the rest of the protocol info... */
new->the_request = r->the_request;
new->allowed = r->allowed;
new->status = r->status;
new->assbackwards = r->assbackwards;
new->header_only = r->header_only;
new->protocol = r->protocol;
new->proto_num = r->proto_num;
new->hostname = r->hostname;
new->request_time = r->request_time;
new->main = r->main;
new->headers_in = r->headers_in;
new->headers_out = ap_make_table(r->pool, 12);
new->err_headers_out = r->err_headers_out;
new->subprocess_env = rename_original_env(r->pool, r->subprocess_env);
new->notes = ap_make_table(r->pool, 5);
new->htaccess = r->htaccess;
new->no_cache = r->no_cache;
new->expecting_100 = r->expecting_100;
new->no_local_copy = r->no_local_copy;
new->read_length = r->read_length; /* We can only read it once */
new->vlist_validator = r->vlist_validator;
#ifdef CHARSET_EBCDIC /* @@@ Is this correct? When is it used? */
new->ebcdic.conv_out= r->ebcdic.conv_out;
new->ebcdic.conv_in = r->ebcdic.conv_in;
#endif
ap_table_setn(new->subprocess_env, "REDIRECT_STATUS",
ap_psprintf(r->pool, "%d", r->status));
/*
* XXX: hmm. This is because mod_setenvif and mod_unique_id really need
* to do their thing on internal redirects as well. Perhaps this is a
* misnamed function.
*/
if ((access_status = ap_run_post_read_request(new))) {
ap_die(access_status, new);
return NULL;
}
return new;
}
API_EXPORT(void) ap_internal_redirect(const char *new_uri, request_rec *r)
{
request_rec *new = internal_internal_redirect(new_uri, r);
process_request_internal(new);
}
/* This function is designed for things like actions or CGI scripts, when
* using AddHandler, and you want to preserve the content type across
* an internal redirect.
*/
API_EXPORT(void) ap_internal_redirect_handler(const char *new_uri, request_rec *r)
{
request_rec *new = internal_internal_redirect(new_uri, r);
if (r->handler)
new->content_type = r->content_type;
process_request_internal(new);
}
/*
* Is it the initial main request, which we only get *once* per HTTP request?
*/
API_EXPORT(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 */
}
/*
* Function to set the r->mtime field to the specified value if it's later
* than what's already there.
*/
API_EXPORT(time_t) ap_update_mtime(request_rec *r, time_t dependency_mtime)
{
if (r->mtime < dependency_mtime) {
r->mtime = dependency_mtime;
}
return r->mtime;
}