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/*++
/* NAME
/* unsafe 3
/* SUMMARY
/* are we running at non-user privileges
/* SYNOPSIS
/* #include <safe.h>
/*
/* int unsafe()
/* DESCRIPTION
/* The \fBunsafe()\fR routine attempts to determine if the process runs
/* with any privileges that do not belong to the user. The purpose is
/* to make it easy to taint any user-provided data such as the current
/* working directory, the process environment, etcetera.
/*
/* On UNIX systems, the result is true when any of the following
/* conditions is true:
/* .IP \(bu
/* The issetuid kernel flag is non-zero (on systems that support
/* this concept).
/* .IP \(bu
/* The real and effective user id differ.
/* .IP \(bu
/* The real and effective group id differ.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <unistd.h>
/* Utility library. */
#include "safe.h"
/* unsafe - can we trust user-provided environment, working directory, etc. */
int unsafe(void)
{
return (geteuid() != getuid()
#ifdef HAS_ISSETUGID
|| issetugid()
#endif
|| getgid() != getegid());
}
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