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-
- /* ====================================================================
- * Copyright (c) 1995 The Apache Group. 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. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * 4. The names "Apache Server" and "Apache Group" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission.
- *
- * 5. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP OR
- * IT'S 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 Group and was originally based
- * on public domain software written at the National Center for
- * Supercomputing Applications, University of Illinois, Urbana-Champaign.
- * For more information on the Apache Group and the Apache HTTP server
- * project, please see <http://www.apache.org/>.
- *
- */
-
-
- /*
- * http_request.c: functions to get and process requests
- *
- * Rob McCool 3/21/93
- *
- * Thoroughly revamped by rst for Shambhala. 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_log.h"
- #include "http_main.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.
- */
-
- int check_symlinks (char *d, int opts)
- {
- 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 FORBIDDEN;
-
- if (stat (d, &fi) < 0) return FORBIDDEN;
-
- return (fi.st_uid == lfi.st_uid) ? OK : FORBIDDEN;
- }
-
- /* Dealing with the file system to get PATH_INFO
- */
-
- void get_path_info(request_rec *r)
- {
- char *cp;
- char *path = r->filename;
- char *end = &path[strlen(path)];
- char *last_cp = NULL;
- int rv;
-
- /* Advance over trailing slashes ... NOT part of filename */
-
- for (cp = end; cp > path && cp[-1] == '/'; --cp)
- continue;
-
- while (cp > path) {
-
- /* See if the pathname ending here exists... */
-
- *cp = '\0';
- rv = stat(path, &r->finfo);
- 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 = pstrdup (r->pool, cp);
- *cp = '\0';
- return;
- }
- else {
- last_cp = cp;
-
- while (--cp > path && *cp != '/')
- continue;
-
- while (cp > path && cp[-1] == '/')
- --cp;
- }
- }
- }
-
- int directory_walk (request_rec *r)
- {
- core_server_config *sconf = get_module_config (r->server->module_config,
- &core_module);
- array_header *sec_array = copy_array (r->pool, sconf->sec);
-
- core_dir_config **sec = (core_dir_config **)sec_array->elts;
- int num_sec = sec_array->nelts;
- void *per_dir_defaults = r->server->lookup_defaults;
- char *test_filename = pstrdup (r->pool, r->filename);
-
- int num_dirs, res;
- int i;
-
- /* 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.
- */
-
- no2slash (test_filename);
- num_dirs = count_dirs(test_filename);
- get_path_info (r);
-
- if (S_ISDIR (r->finfo.st_mode)) ++num_dirs;
-
- for (i = 1; i <= num_dirs; ++i) {
- core_dir_config *core_dir =
- (core_dir_config *)get_module_config(per_dir_defaults, &core_module);
- int allowed_here = core_dir->opts;
- int overrides_here = core_dir->override;
- void *this_conf = NULL, *htaccess_conf = NULL;
- char *this_dir = make_dirstr (r->pool, test_filename, i);
- char *config_name = make_full_path(r->pool, this_dir,
- sconf->access_name);
- int j;
-
- /* Do symlink checks first, because they are done with the
- * permissions appropriate to the *parent* directory...
- */
-
- if ((res = check_symlinks (this_dir, allowed_here)))
- {
- log_reason("Symbolic link not allowed", this_dir, r);
- return res;
- }
-
- /* Begin *this* level by looking for matching <Directory> sections from
- * access.conf.
- */
-
- for (j = 0; j < num_sec; ++j) {
- void *entry_config = sec[j];
- core_dir_config *entry_core;
- char *entry_dir;
-
- if (!entry_config) continue;
-
- entry_core =
- (core_dir_config *)get_module_config(entry_config, &core_module);
- entry_dir = entry_core->d;
-
- if (is_matchexp(entry_dir) && !strcmp_match(this_dir, entry_dir)) {
- /* Don't try this wildcard again --- if it ends in '*'
- * it'll match again, and subdirectories won't be able to
- * override it...
- */
- sec[j] = NULL;
- this_conf = entry_config;
- }
- else if (!strcmp (this_dir, entry_dir))
- this_conf = entry_config;
- }
-
- if (this_conf)
- {
- per_dir_defaults =
- merge_per_dir_configs (r->pool, per_dir_defaults, this_conf);
- core_dir =(core_dir_config *)get_module_config(per_dir_defaults,
- &core_module);
- }
- overrides_here = core_dir->override;
-
- /* If .htaccess files are enabled, check for one.
- */
-
- if (overrides_here) {
- res = parse_htaccess (&htaccess_conf, r, overrides_here,
- this_dir, config_name);
- if (res) return res;
- }
-
- if (htaccess_conf)
- per_dir_defaults =
- merge_per_dir_configs (r->pool, per_dir_defaults,
- htaccess_conf);
-
- }
-
- r->per_dir_config = per_dir_defaults;
-
- if ((res = check_symlinks (r->filename, allow_options(r))))
- {
- log_reason("Symbolic link not allowed", r->filename, r);
- return res;
- }
-
- return OK; /* Can only "fail" if access denied
- * by the symlink goop.
- */
- }
-
- /*****************************************************************
- *
- * 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 Shambhala 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...
- */
-
- request_rec *make_sub_request (request_rec *r)
- {
- pool *rrp = make_sub_pool (r->pool);
- request_rec *rr = pcalloc (rrp, sizeof (request_rec));
-
- rr->pool = rrp;
- return rr;
- }
-
- request_rec *sub_req_lookup_simple (char *new_file, request_rec *r)
- {
- /* This handles the simple case, common to ..._lookup_uri and _file,
- * of looking up another file in the same directory.
- */
- request_rec *rnew = make_sub_request (r);
- pool *rnewp = rnew->pool;
- int res;
-
- char *udir = make_dirstr(rnewp, r->uri, count_dirs(r->uri));
- char *fdir = make_dirstr(rnewp, r->filename, count_dirs(r->filename));
-
- *rnew = *r; /* Copy per_dir config, etc. */
- rnew->pool = rnewp;
- rnew->uri = make_full_path (rnewp, udir, new_file);
- rnew->filename = make_full_path (rnewp, fdir, new_file);
- set_sub_req_protocol (rnew, r);
-
- rnew->finfo.st_mode = 0;
-
- if ((res = check_symlinks (rnew->filename, allow_options (rnew))))
- {
- rnew->status = res;
- }
-
- if (rnew->finfo.st_mode == 0 && stat (rnew->filename, &rnew->finfo) < 0)
- rnew->finfo.st_mode = 0;
-
- if ((rnew->status == 200) && (res = find_types (rnew)))
- rnew->status = res;
-
- if ((rnew->status == 200) && (res = run_fixups (rnew)))
- rnew->status = res;
-
- return rnew;
- }
-
- request_rec *sub_req_lookup_uri (char *new_file, request_rec *r)
- {
- request_rec *rnew;
- int res;
- char *udir;
-
- rnew = make_sub_request (r);
- rnew->connection = r->connection;
- rnew->server = r->server;
- rnew->request_config = create_request_config (rnew->pool);
- set_sub_req_protocol (rnew, r);
-
- if (new_file[0] == '/')
- parse_uri(rnew, new_file);
- else
- {
- udir = make_dirstr (rnew->pool, r->uri, count_dirs (r->uri));
- udir = escape_uri(rnew->pool, udir); /* re-escape it */
- parse_uri (rnew, make_full_path (rnew->pool, udir, new_file));
- }
-
- res = unescape_url (rnew->uri);
- if (res)
- {
- rnew->status = res;
- return rnew;
- }
-
- getparents (rnew->uri);
-
- res = 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.
- * Maybe it would be easier to implement a cache for directory and
- * .htaccess stats, or perhaps pass the old request to translate_name()
- * for it to do the optimisation.
- */
-
- if ((res = directory_walk (rnew))
- || (!auth_type (rnew) ? 0 :
- ((res = check_user_id (rnew)) || (res = check_auth (rnew))))
- || (res = check_access (rnew))
- || (res = find_types (rnew))
- || (res = run_fixups (rnew))
- )
- {
- rnew->status = res;
- }
-
- return rnew;
- }
-
- request_rec *sub_req_lookup_file (char *new_file, request_rec *r)
- {
- request_rec *rnew;
- int res;
- char *fdir;
-
- /* 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 don't have to redo any access checks.
- */
-
- if (strchr (new_file, '/') == NULL)
- return sub_req_lookup_simple (new_file, r);
-
- rnew = make_sub_request (r);
- fdir = make_dirstr (rnew->pool, r->filename, count_dirs (r->filename));
-
- rnew->connection = r->connection; /* For now... */
- rnew->server = r->server;
- rnew->request_config = create_request_config (rnew->pool);
- set_sub_req_protocol (rnew, r);
-
- rnew->uri = "INTERNALLY GENERATED file-relative req";
- rnew->filename = ((new_file[0] == '/') ?
- new_file :
- make_full_path (rnew->pool, fdir, new_file));
-
- if ((res = directory_walk (rnew))
- || (res = check_access (rnew))
- || (!auth_type (rnew) ? 0 :
- ((res = check_user_id (rnew)) && (res = check_auth (rnew))))
- || (res = find_types (rnew))
- || (res = run_fixups (rnew))
- )
- {
- rnew->status = res;
- }
-
- return rnew;
- }
-
- int run_sub_req (request_rec *r)
- {
- int retval = invoke_handler (r);
- finalize_sub_req_protocol (r);
- return retval;
- }
-
- void destroy_sub_req (request_rec *r)
- {
- /* Reclaim the space */
- destroy_pool (r->pool);
- }
-
- /*****************************************************************
- *
- * Mainline request processing...
- */
-
- void die(int type, request_rec *r)
- {
- int error_index = index_of_response (type);
- char *custom_response = response_code_string(r, error_index);
- int recursive_error = 0;
-
- /* 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 != 200) {
- recursive_error = type;
-
- while (r->prev && r->prev->status != 200)
- r = r->prev; /* Get back to original error */
-
- type = r->status;
- custom_response = NULL; /* Do NOT retry the custom thing! */
- }
-
- r->status = type;
-
- /* 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 (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;
- table_set (r->headers_out, "Location", custom_response);
- } else if ( custom_response[0] == '/') {
- r->no_cache = 1; /* Do NOT send USE_LOCAL_COPY for
- * error documents!
- */
- 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;
- log_reason("Invalid error redirection directive", custom_response,
- r);
- }
- }
-
- send_error_response (r, recursive_error);
- }
-
- static void decl_die (int status, char *phase, request_rec *r)
- {
- if (status == DECLINED) {
- log_reason (pstrcat (r->pool,
- "configuration error: couldn't ",
- phase, NULL),
- r->uri,
- r);
- die (SERVER_ERROR, r);
- }
- else die (status, r);
- }
-
- void process_request_internal (request_rec *r)
- {
- int access_status;
-
- /* Kludge to be reading the assbackwards field outside of protocol.c,
- * but we've got to check for this sort of nonsense somewhere...
- */
-
- if (r->assbackwards && r->header_only) {
- /* Client asked for headers only with HTTP/0.9, which doesn't
- * send headers! Have to dink things even to make sure the
- * error message comes through...
- */
- log_reason ("client sent illegal HTTP/0.9 request", r->uri, r);
- r->header_only = 0;
- die (BAD_REQUEST, r);
- return;
- }
-
- access_status = unescape_url(r->uri);
- if (access_status)
- {
- die(access_status, r);
- return;
- }
-
- getparents(r->uri); /* OK --- shrinking transformations... */
-
- if ((access_status = translate_name (r))) {
- decl_die (access_status, "translate", r);
- return;
- }
-
- if ((access_status = directory_walk (r))) {
- die (access_status, r);
- return;
- }
-
- if ((access_status = check_access (r)) != 0) {
- decl_die (access_status, "check access", r);
- return;
- }
-
- if (auth_type (r)) {
- if ((access_status = check_user_id (r)) != 0) {
- decl_die (access_status, "check user. No user file?", r);
- return;
- }
-
- if ((access_status = check_auth (r)) != 0) {
- decl_die (access_status, "check access. No groups file?", r);
- return;
- }
- }
-
- if ((access_status = find_types (r)) != 0) {
- decl_die (access_status, "find types", r);
- return;
- }
-
- if ((access_status = run_fixups (r)) != 0) {
- die (access_status, r);
- return;
- }
-
- if ((access_status = invoke_handler (r)) != 0)
- die (access_status, r);
- }
-
- void process_request (request_rec *r)
- {
- process_request_internal (r);
- log_transaction (r);
- }
-
- table *rename_original_env (pool *p, table *t)
- {
- array_header *env_arr = table_elts (t);
- table_entry *elts = (table_entry *)env_arr->elts;
- table *new = make_table (p, env_arr->nelts);
- int i;
-
- for (i = 0; i < env_arr->nelts; ++i) {
- if (!elts[i].key) continue;
- table_set (new, pstrcat (p, "REDIRECT_", elts[i].key, NULL),
- elts[i].val);
- }
-
- return new;
- }
-
- void internal_redirect (char *new_uri, request_rec *r)
- {
- request_rec *new = (request_rec *)pcalloc(r->pool, sizeof(request_rec));
- char t[10]; /* Long enough... */
-
- new->connection = r->connection;
- new->server = r->server;
- new->pool = r->pool;
-
- /* A whole lot of this really ought to be shared with protocol.c...
- * another missing cleanup. It's particularly inappropriate to be
- * setting header_only, etc., here.
- */
-
- parse_uri (new, new_uri);
- new->request_config = create_request_config (r->pool);
- new->per_dir_config = r->server->lookup_defaults;
-
- new->prev = r;
- r->next = new;
-
- /* We are redirecting. Treat the internally generated transaction
- * as a GET, since there is not a chance of its getting POST-style
- * arguments.
- */
- new->method = "GET";
- new->method_number = M_GET;
-
- /* Inherit the rest of the protocol info... */
-
- new->status = r->status;
- new->assbackwards = r->assbackwards;
- new->header_only = r->header_only;
- new->protocol = r->protocol;
- new->main = r->main;
-
- new->headers_in = r->headers_in;
- new->headers_out = make_table (r->pool, 5);
- new->err_headers_out = r->err_headers_out;
- new->subprocess_env = rename_original_env (r->pool, r->subprocess_env);
- new->notes = make_table (r->pool, 5);
-
- new->no_cache = r->no_cache; /* If we've already made up our minds
- * about this, don't change 'em back!
- */
-
- sprintf (t, "%d", r->status);
- table_set (new->subprocess_env, "REDIRECT_STATUS", pstrdup (r->pool, t));
-
- process_request_internal (new);
- }
-
-