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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* This file will include OS specific functions which are not inlineable.
* Any inlineable functions should be defined in os-inline.c instead.
*/
#ifdef _OSD_POSIX
#include "os.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "apr_lib.h"
#define USER_LEN 8
APLOG_USE_MODULE(core);
typedef enum
{
bs2_unknown, /* not initialized yet. */
bs2_noFORK, /* no fork() because -X flag was specified */
bs2_FORK, /* only fork() because uid != 0 */
bs2_UFORK /* Normally, ufork() is used to switch identities. */
} bs2_ForkType;
static bs2_ForkType forktype = bs2_unknown;
/* Determine the method for forking off a child in such a way as to
* set both the POSIX and BS2000 user id's to the unprivileged user.
*/
static bs2_ForkType os_forktype(int one_process)
{
/* have we checked the OS version before? If yes return the previous
* result - the OS release isn't going to change suddenly!
*/
if (forktype == bs2_unknown) {
/* not initialized yet */
/* No fork if the one_process option was set */
if (one_process) {
forktype = bs2_noFORK;
}
/* If the user is unprivileged, use the normal fork() only. */
else if (getuid() != 0) {
forktype = bs2_FORK;
}
else
forktype = bs2_UFORK;
}
return forktype;
}
/* This routine complements the setuid() call: it causes the BS2000 job
* environment to be switched to the target user's user id.
* That is important if CGI scripts try to execute native BS2000 commands.
*/
int os_init_job_environment(server_rec *server, const char *user_name, int one_process)
{
bs2_ForkType type = os_forktype(one_process);
/* We can be sure that no change to uid==0 is possible because of
* the checks in http_core.c:set_user()
*/
if (one_process) {
type = forktype = bs2_noFORK;
ap_log_error(APLOG_MARK, APLOG_ERR, 0, server, APLOGNO(02170)
"The debug mode of Apache should only "
"be started by an unprivileged user!");
return 0;
}
return 0;
}
/* BS2000 requires a "special" version of fork() before a setuid() call */
pid_t os_fork(const char *user)
{
pid_t pid;
char username[USER_LEN+1];
switch (os_forktype(0)) {
case bs2_FORK:
pid = fork();
break;
case bs2_UFORK:
apr_cpystrn(username, user, sizeof username);
/* Make user name all upper case - for some versions of ufork() */
ap_str_toupper(username);
pid = ufork(username);
if (pid == -1 && errno == EPERM) {
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, ap_server_conf,
APLOGNO(02171) "ufork: Possible mis-configuration "
"for user %s - Aborting.", user);
exit(1);
}
break;
default:
pid = 0;
break;
}
return pid;
}
#else /* _OSD_POSIX */
void bs2000_os_is_not_here()
{
}
#endif /* _OSD_POSIX */
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