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1be5367573
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@84880 13f79535-47bb-0310-9956-ffa450edef68
395 lines
12 KiB
C
395 lines
12 KiB
C
/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2000 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* nor may "Apache" appear in their name, without prior written
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* permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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* Portions of this software are based upon public domain software
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* originally written at the National Center for Supercomputing Applications,
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* University of Illinois, Urbana-Champaign.
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*/
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#include "ap_config.h"
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#include "httpd.h"
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#include "http_config.h"
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#include "http_main.h"
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#include "http_log.h"
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#include "unixd.h"
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#include <pwd.h>
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unixd_config_rec unixd_config;
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void unixd_detach(void)
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{
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int x;
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pid_t pgrp;
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chdir("/");
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#if !defined(MPE) && !defined(OS2) && !defined(TPF)
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/* Don't detach for MPE because child processes can't survive the death of
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the parent. */
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if ((x = fork()) > 0)
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exit(0);
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else if (x == -1) {
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perror("fork");
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ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
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"%s: unable to fork new process", ap_server_argv0);
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exit(1);
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}
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RAISE_SIGSTOP(DETACH);
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#endif
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#ifdef HAVE_SETSID
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if ((pgrp = setsid()) == -1) {
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perror("setsid");
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ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
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"%s: setsid failed", ap_server_argv0);
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exit(1);
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}
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#elif defined(NEXT) || defined(NEWSOS)
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if (setpgrp(0, getpid()) == -1 || (pgrp = getpgrp(0)) == -1) {
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perror("setpgrp");
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ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
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"%s: setpgrp or getpgrp failed", ap_server_argv0);
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exit(1);
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}
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#elif defined(OS2) || defined(TPF)
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/* OS/2 and TPF don't support process group IDs */
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pgrp = getpid();
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#elif defined(MPE)
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/* MPE uses negative pid for process group */
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pgrp = -getpid();
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#else
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if ((pgrp = setpgrp(getpid(), 0)) == -1) {
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perror("setpgrp");
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ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
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"%s: setpgrp failed", ap_server_argv0);
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exit(1);
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}
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#endif
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/* close out the standard file descriptors */
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if (freopen("/dev/null", "r", stdin) == NULL) {
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ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
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"%s: unable to replace stdin with /dev/null: %s",
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ap_server_argv0, strerror(errno));
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/* continue anyhow -- note we can't close out descriptor 0 because we
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* have nothing to replace it with, and if we didn't have a descriptor
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* 0 the next file would be created with that value ... leading to
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* havoc.
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*/
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}
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if (freopen("/dev/null", "w", stdout) == NULL) {
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ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
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"%s: unable to replace stdout with /dev/null: %s",
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ap_server_argv0, strerror(errno));
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}
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/* stderr is a tricky one, we really want it to be the error_log,
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* but we haven't opened that yet. So leave it alone for now and it'll
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* be reopened moments later.
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*/
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}
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/* Set group privileges.
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*
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* Note that we use the username as set in the config files, rather than
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* the lookup of to uid --- the same uid may have multiple passwd entries,
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* with different sets of groups for each.
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*/
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static int set_group_privs(void)
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{
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if (!geteuid()) {
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char *name;
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/* Get username if passed as a uid */
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if (unixd_config.user_name[0] == '#') {
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struct passwd *ent;
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uid_t uid = atoi(&unixd_config.user_name[1]);
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if ((ent = getpwuid(uid)) == NULL) {
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ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
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"getpwuid: couldn't determine user name from uid %u, "
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"you probably need to modify the User directive",
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(unsigned)uid);
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return -1;
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}
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name = ent->pw_name;
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}
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else
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name = unixd_config.user_name;
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#if !defined(OS2) && !defined(TPF)
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/* OS/2 and TPF don't support groups. */
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/*
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* Set the GID before initgroups(), since on some platforms
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* setgid() is known to zap the group list.
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*/
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if (setgid(unixd_config.group_id) == -1) {
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ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
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"setgid: unable to set group id to Group %u",
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(unsigned)unixd_config.group_id);
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return -1;
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}
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/* Reset `groups' attributes. */
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if (initgroups(name, unixd_config.group_id) == -1) {
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ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
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"initgroups: unable to set groups for User %s "
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"and Group %u", name, (unsigned)unixd_config.group_id);
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return -1;
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}
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#endif /* !defined(OS2) && !defined(TPF) */
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}
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return 0;
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}
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int unixd_setup_child(void)
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{
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if (set_group_privs()) {
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return -1;
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}
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#ifdef MPE
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/* Only try to switch if we're running as MANAGER.SYS */
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if (geteuid() == 1 && unixd_config.user_id > 1) {
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GETPRIVMODE();
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if (setuid(unixd_config.user_id) == -1) {
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GETUSERMODE();
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ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
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"setuid: unable to change to uid: %ld",
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(long) unixd_config.user_id);
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exit(1);
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}
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GETUSERMODE();
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}
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#else
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/* Only try to switch if we're running as root */
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if (!geteuid() && (
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#ifdef _OSD_POSIX
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os_init_job_environment(server_conf, unixd_config.user_name, one_process) != 0 ||
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#endif
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setuid(unixd_config.user_id) == -1)) {
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ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
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"setuid: unable to change to uid: %ld",
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(long) unixd_config.user_id);
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return -1;
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}
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#endif
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return 0;
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}
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const char *unixd_set_user(cmd_parms *cmd, void *dummy, char *arg)
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{
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const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
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if (err != NULL) {
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return err;
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}
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unixd_config.user_name = arg;
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unixd_config.user_id = ap_uname2id(arg);
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#if !defined (BIG_SECURITY_HOLE) && !defined (OS2)
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if (unixd_config.user_id == 0) {
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return "Error:\tApache has not been designed to serve pages while\n"
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"\trunning as root. There are known race conditions that\n"
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"\twill allow any local user to read any file on the system.\n"
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"\tIf you still desire to serve pages as root then\n"
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"\tadd -DBIG_SECURITY_HOLE to the EXTRA_CFLAGS line in your\n"
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"\tsrc/Configuration file and rebuild the server. It is\n"
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"\tstrongly suggested that you instead modify the User\n"
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"\tdirective in your httpd.conf file to list a non-root\n"
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"\tuser.\n";
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}
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#endif
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return NULL;
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}
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const char *unixd_set_group(cmd_parms *cmd, void *dummy, char *arg)
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{
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const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
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if (err != NULL) {
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return err;
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}
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unixd_config.group_id = ap_gname2id(arg);
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return NULL;
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}
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void unixd_pre_config(void)
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{
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unixd_config.user_name = DEFAULT_USER;
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unixd_config.user_id = ap_uname2id(DEFAULT_USER);
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unixd_config.group_id = ap_gname2id(DEFAULT_GROUP);
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}
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#ifdef NEED_AP_SYS_SIGLIST
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const char *ap_sys_siglist[NumSIG];
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void unixd_siglist_init(void)
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{
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int sig;
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ap_sys_siglist[0] = "Signal 0";
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#ifdef SIGHUP
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ap_sys_siglist[SIGHUP] = "Hangup";
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#endif
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#ifdef SIGINT
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ap_sys_siglist[SIGINT] = "Interrupt";
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#endif
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#ifdef SIGQUIT
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ap_sys_siglist[SIGQUIT] = "Quit";
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#endif
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#ifdef SIGILL
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ap_sys_siglist[SIGILL] = "Illegal instruction";
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#endif
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#ifdef SIGTRAP
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ap_sys_siglist[SIGTRAP] = "Trace/BPT trap";
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#endif
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#ifdef SIGIOT
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ap_sys_siglist[SIGIOT] = "IOT instruction";
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#endif
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#ifdef SIGABRT
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ap_sys_siglist[SIGABRT] = "Abort";
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#endif
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#ifdef SIGEMT
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ap_sys_siglist[SIGEMT] = "Emulator trap";
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#endif
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#ifdef SIGFPE
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ap_sys_siglist[SIGFPE] = "Arithmetic exception";
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#endif
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#ifdef SIGKILL
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ap_sys_siglist[SIGKILL] = "Killed";
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#endif
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#ifdef SIGBUS
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ap_sys_siglist[SIGBUS] = "Bus error";
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#endif
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#ifdef SIGSEGV
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ap_sys_siglist[SIGSEGV] = "Segmentation fault";
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#endif
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#ifdef SIGSYS
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ap_sys_siglist[SIGSYS] = "Bad system call";
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#endif
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#ifdef SIGPIPE
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ap_sys_siglist[SIGPIPE] = "Broken pipe";
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#endif
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#ifdef SIGALRM
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ap_sys_siglist[SIGALRM] = "Alarm clock";
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#endif
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#ifdef SIGTERM
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ap_sys_siglist[SIGTERM] = "Terminated";
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#endif
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#ifdef SIGUSR1
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ap_sys_siglist[SIGUSR1] = "User defined signal 1";
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#endif
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#ifdef SIGUSR2
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ap_sys_siglist[SIGUSR2] = "User defined signal 2";
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#endif
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#ifdef SIGCLD
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ap_sys_siglist[SIGCLD] = "Child status change";
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#endif
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#ifdef SIGCHLD
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ap_sys_siglist[SIGCHLD] = "Child status change";
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#endif
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#ifdef SIGPWR
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ap_sys_siglist[SIGPWR] = "Power-fail restart";
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#endif
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#ifdef SIGWINCH
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ap_sys_siglist[SIGWINCH] = "Window changed";
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#endif
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#ifdef SIGURG
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ap_sys_siglist[SIGURG] = "urgent socket condition";
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#endif
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#ifdef SIGPOLL
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ap_sys_siglist[SIGPOLL] = "Pollable event occurred";
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#endif
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#ifdef SIGIO
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ap_sys_siglist[SIGIO] = "socket I/O possible";
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#endif
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#ifdef SIGSTOP
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ap_sys_siglist[SIGSTOP] = "Stopped (signal)";
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#endif
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#ifdef SIGTSTP
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ap_sys_siglist[SIGTSTP] = "Stopped";
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#endif
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#ifdef SIGCONT
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ap_sys_siglist[SIGCONT] = "Continued";
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#endif
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#ifdef SIGTTIN
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ap_sys_siglist[SIGTTIN] = "Stopped (tty input)";
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#endif
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#ifdef SIGTTOU
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ap_sys_siglist[SIGTTOU] = "Stopped (tty output)";
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#endif
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#ifdef SIGVTALRM
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ap_sys_siglist[SIGVTALRM] = "virtual timer expired";
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#endif
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#ifdef SIGPROF
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ap_sys_siglist[SIGPROF] = "profiling timer expired";
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#endif
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#ifdef SIGXCPU
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ap_sys_siglist[SIGXCPU] = "exceeded cpu limit";
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#endif
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#ifdef SIGXFSZ
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ap_sys_siglist[SIGXFSZ] = "exceeded file size limit";
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#endif
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for (sig=0; sig < sizeof(ap_sys_siglist)/sizeof(ap_sys_siglist[0]); ++sig)
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if (ap_sys_siglist[sig] == NULL)
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ap_sys_siglist[sig] = "";
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}
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#endif /* NEED_AP_SYS_SIGLIST */
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