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/*
** cgi-wrapper.c:
** generic wrapper that will take info from a environment
** variable, and pass it to two commands.
**
** Copyright (C) 1998 by the Free Software Foundation, Inc.
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License
** as published by the Free Software Foundation; either version 2
** of the License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 0211-1307, USA.
**
** 10-17-96 : Hal Schechner (hal-j@channel21.com)
**
** 12-14-96 : John Viega (viega@list.org)
** changed to work on 1 command, take a list of
** valid commands, just pass on argv, and use
** execvp() Also threw in some useful feedback for
** when there's a failure, mainly for future
** debugging.
**
** 03-31-98 : John Viega (viega@list.org)
** Consolidated all CGI wrappers into 1, removed
** checking the command name, (it was not real
** security anyway...) and changed it to use
** syslog on error. This definitely doesn't have
** any of Hal's code left ;-)
**
*/
#include <stdio.h>
#include <stdarg.h>
#include <syslog.h>
#define COMMAND "/home/mailman/mailman/cgi/" ## SCRIPT
#define LOG_IDENT "Mailman-wrapper (" ## SCRIPT ## ")"
const int LEGAL_PARENT_UID = 60001; /* nobody's UID */
const int LEGAL_PARENT_GID = 60001; /* nobody's GID */
/*
** Report an error then exit.
*/
void
err(char *format, ...)
{
char log_entry[1024];
va_list arg_ptr;
va_start(arg_ptr, format);
vsprintf(log_entry, format, arg_ptr);
va_end(arg_ptr);
/* Write to the console, maillog is often mostly ignored, and root
* should definitely know about any problems.
*/
openlog(LOG_IDENT, LOG_CONS, LOG_MAIL);
syslog(LOG_ERR, "%s", log_entry);
closelog();
exit(0);
}
/*
** is the parent process allowed to call us?
*/
void
check_caller()
{
/* compare to our parent's uid */
if (LEGAL_PARENT_UID != getuid()) {
err("Attempt to exec cgi %d made by uid %d",
LEGAL_PARENT_UID,
getuid());
}
if (LEGAL_PARENT_GID != getgid()) {
err("Attempt to exec cgi %d made by gid %d",
LEGAL_PARENT_GID,
getgid());
}
}
int
main(int argc, char **argv, char **env)
{
int i;
check_caller();
/* If we get here, the caller is OK. */
setuid(geteuid());
execve(COMMAND, &argv[0], env);
err("execve of %s failed!", COMMAND);
}
/*
* Local Variables:
* c-file-style: "python"
* End:
*/
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