/*++ /* 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 privileges or has access to information) that the /* controlling user has no access to. The purpose is to prevent /* misuse of privileges, including access to protected information. /* /* The result is always false when both of the following conditions /* are true: /* .IP \(bu /* The real UID is zero. /* .IP \(bu /* The effective UID is zero. /* .PP /* Otherwise, the result is true if 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 /* /* Wietse Venema /* Google, Inc. /* 111 8th Avenue /* New York, NY 10011, 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. */
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