bs2login.c revision 10a4cdd68ef1ca0e54af296fe1d08ac00150c90b
2128N/A/* ====================================================================
2128N/A * The Apache Software License, Version 1.1
2128N/A *
2128N/A * Copyright (c) 2000 The Apache Software Foundation. All rights
2128N/A * reserved.
2128N/A *
2128N/A * Redistribution and use in source and binary forms, with or without
2128N/A * modification, are permitted provided that the following conditions
2128N/A * are met:
2128N/A *
2128N/A * 1. Redistributions of source code must retain the above copyright
2128N/A * notice, this list of conditions and the following disclaimer.
2128N/A *
2128N/A * 2. Redistributions in binary form must reproduce the above copyright
2128N/A * notice, this list of conditions and the following disclaimer in
2128N/A * the documentation and/or other materials provided with the
2128N/A * distribution.
2128N/A *
2128N/A * 3. The end-user documentation included with the redistribution,
2128N/A * if any, must include the following acknowledgment:
3817N/A * "This product includes software developed by the
2128N/A * Apache Software Foundation (http://www.apache.org/)."
2128N/A * Alternately, this acknowledgment may appear in the software itself,
2128N/A * if and wherever such third-party acknowledgments normally appear.
2128N/A *
2128N/A * 4. The names "Apache" and "Apache Software Foundation" must
2128N/A * not be used to endorse or promote products derived from this
2128N/A * software without prior written permission. For written
2128N/A * permission, please contact apache@apache.org.
3817N/A *
3817N/A * 5. Products derived from this software may not be called "Apache",
2128N/A * nor may "Apache" appear in their name, without prior written
2128N/A * permission of the Apache Software Foundation.
2128N/A *
2128N/A * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
2128N/A * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3817N/A * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3817N/A * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
2128N/A * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
2128N/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
3817N/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
3817N/A * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
3817N/A * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
3817N/A * 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.
*/
#ifdef _OSD_POSIX
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include <ctype.h>
#include <sys/utsname.h>
#define ACCT_LEN 8
#define USER_LEN 8
static const char *bs2000_account = NULL;
typedef enum
{
bs2_unknown, /* not initialized yet. */
bs2_noFORK, /* no fork() because -X flag was specified */
bs2_FORK, /* only fork() because uid != 0 */
bs2_FORK_RINI, /* prior to A17, regular fork() and _rini() was used. */
bs2_RFORK_RINI, /* for A17, use of _rfork() and _rini() was required */
bs2_UFORK /* As of A18, the new ufork() is used. */
} bs2_ForkType;
static bs2_ForkType forktype = bs2_unknown;
static void ap_pad(char *dest, size_t size, char ch)
{
int i = strlen(dest); /* Leave space for trailing '\0' */
while (i < size-1)
dest[i++] = ch;
dest[size-1] = '\0'; /* Guarantee for trailing '\0' */
}
static void ap_str_toupper(char *str)
{
while (*str) {
*str = apr_toupper(*str);
++str;
}
}
/* 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(void)
{
struct utsname os_version;
/* 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) {
return forktype;
}
/* If the user is unprivileged, use the normal fork() only. */
if (getuid() != 0) {
return forktype = bs2_FORK;
}
if (uname(&os_version) < 0)
{
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
"uname() failed - aborting.");
exit(APEXIT_CHILDFATAL);
}
/*
* Old BS2000/OSD versions (before XPG4 SPEC1170) don't work with Apache.
* Anyway, simply return a fork().
*/
if (strcmp(os_version.release, "01.0A") == 0 ||
strcmp(os_version.release, "02.0A") == 0 ||
strcmp(os_version.release, "02.1A") == 0)
{
ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, NULL,
"Error: unsupported OS version. "
"You may encounter problems.");
forktype = bs2_FORK;
}
/* The following versions are special:
* OS versions before A17 needs regular fork() and _rini().
* A17 requires _rfork() and _rini(),
* and later versions need ufork().
*/
else if (strcmp(os_version.release, "01.1A") == 0 ||
strcmp(os_version.release, "03.0A") == 0 ||
strcmp(os_version.release, "03.1A") == 0 ||
strcmp(os_version.release, "04.0A") == 0)
{
if (strcmp (os_version.version, "A18") >= 0)
forktype = bs2_UFORK;
else if (strcmp (os_version.version, "A17") < 0)
forktype = bs2_FORK_RINI;
else
forktype = bs2_RFORK_RINI;
}
/* All later OS versions will hopefully use ufork() only ;-) */
else
forktype = bs2_UFORK;
return forktype;
}
/* This routine is called by http_core for the BS2000Account directive */
/* It stores the account name for later use */
const char *os_set_account(apr_pool_t *p, const char *account)
{
char account_temp[ACCT_LEN+1];
apr_cpystrn(account_temp, account, sizeof account_temp);
/* Make account all upper case */
ap_str_toupper(account_temp);
/* Pad to length 8 */
ap_pad(account_temp, sizeof account_temp, ' ');
bs2000_account = apr_pstrdup(p, account_temp);
return NULL;
}
/* 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)
{
_rini_struct inittask;
char username[USER_LEN+1];
int save_errno;
bs2_ForkType type = os_forktype();
/* We can be sure that no change to uid==0 is possible because of
* the checks in http_core.c:set_user()
*/
/* The _rini() function works only after a prior _rfork().
* In the case of one_process, it would fail.
*/
if (one_process) {
type = forktype = bs2_noFORK;
ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, server,
"The debug mode of Apache should only "
"be started by an unprivileged user!");
return 0;
}
/* If no _rini() is required, then return quickly. */
if (type != bs2_RFORK_RINI && type != bs2_FORK_RINI)
return 0;
/* An Account is required for _rini() */
if (bs2000_account == NULL)
{
ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, server,
"No BS2000Account configured - cannot switch to User %s",
user_name);
exit(APEXIT_CHILDFATAL);
}
apr_cpystrn(username, user_name, sizeof username);
/* Make user name all upper case */
ap_str_toupper(username);
/* Pad to length 8 */
ap_pad(username, sizeof username, ' ');
inittask.username = username;
inittask.account = bs2000_account;
inittask.processor_name = " ";
/* Switch to the new logon user (setuid() and setgid() are done later) */
/* Only the super user can switch identities. */
if (_rini(&inittask) != 0) {
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server,
"_rini: BS2000 auth failed for user \"%s\" acct \"%s\"",
inittask.username, inittask.account);
exit(APEXIT_CHILDFATAL);
}
return 0;
}
/* BS2000 requires a "special" version of fork() before a setuid()/_rini() call */
pid_t os_fork(const char *user)
{
pid_t pid;
char username[USER_LEN+1];
switch (os_forktype()) {
case bs2_FORK:
case bs2_FORK_RINI:
pid = fork();
break;
case bs2_RFORK_RINI:
pid = _rfork();
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,
NULL, "ufork: Possible mis-configuration "
"for user %s - Aborting.", user);
exit(1);
}
break;
default:
pid = 0;
break;
}
return pid;
}
#else /* _OSD_POSIX */
void bs2login_is_not_here()
{
}
#endif /* _OSD_POSIX */