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+.\" Copyright (c) 1997 David Nugent <davidn@blaze.net.au>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, is permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice immediately at the beginning of the file, without modification,
+.\"    this list of conditions, and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. This work was done expressly for inclusion into FreeBSD.  Other use
+.\"    is permitted provided this notation is included.
+.\" 4. Absolutely no warranty of function or purpose is made by the author
+.\"    David Nugent.
+.\" 5. Modifications may be freely made to this file providing the above
+.\"    conditions are met.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 2, 1997
+.Dt _SECURE_PATH 3
+.Os
+.Sh NAME
+.Nm _secure_path
+.Nd determine if a file appears to be secure
+.Sh LIBRARY
+.Lb libutil
+.Sh SYNOPSIS
+.In sys/types.h
+.In libutil.h
+.Ft int
+.Fn _secure_path "const char *path" "uid_t uid" "gid_t gid"
+.Sh DESCRIPTION
+This function does some basic security checking on a given path.
+It is intended to be used by processes running with root privileges
+in order to decide whether or not to trust the contents of a given
+file.
+It uses a method often used to detect system compromise.
+.Pp
+A file is considered
+.Sq secure
+if it meets the following conditions:
+.Bl -enum
+.It
+The file exists, and is a regular file (not a symlink, device
+special or named pipe, etc.),
+.It
+Is not world writable.
+.It
+Is owned by the given uid or uid 0, if uid is not -1,
+.It
+Is not group writable or it has group ownership by the given
+gid, if gid is not -1.
+.El
+.Sh RETURN VALUES
+This function returns zero if the file exists and may be
+considered secure, -2 if the file does not exist, and
+-1 otherwise to indicate a security failure.
+The
+.Xr syslog 3
+function is used to log any failure of this function, including the
+reason, at LOG_ERR priority.
+.Sh SEE ALSO
+.Xr lstat 2 ,
+.Xr syslog 3
+.Sh HISTORY
+Code from which this function was derived was contributed to the
+.Fx
+project by Berkeley Software Design, Inc.
+.Sh BUGS
+The checks carried out are rudimentary and no attempt is made
+to eliminate race conditions between use of this function and
+access to the file referenced.