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1e890b056a
- getnetgrent.c: address some NIS compatibility problems. We really need to use the netgroup.byuser and netgroup.byhost maps to speed up innetgr() when using NIS. Also, change the NIS interaction in the following way: If /etc/netgroup does not exist or is empty (or contains only the NIS '+' token), we now use NIS exclusively. This lets us use the 'reverse netgroup' maps and is more or less the behavior of other platforms. If /etc/netgroup exists and contains local netgroup data (but no '+'). we use only lthe local stuff and ignore NIS. If /etc/netgroup exists and contains both local data and the '+', we use the local data nd the netgroup map as a single combined database (which, unfortunately, can be slow when the netgroup database is large). This is what we have been doing up until now. Head off a potential NULL pointer dereference in the old innetgr() matching code. Also fix the way the NIS netgroup map is incorporated into things: adding the '+' is supposed to make it seem as though the netgroup database is 'inserted' wherever the '+' is placed. We didn't quite do it that way before. (The NetBSD people apparently use a real, honest-to-gosh, netgroup.db database that works just like the password database. This is actually a neat idea since netgroups is the sort of thing that can really benefit from having multi-key search capability, particularly since reverse lookups require more than a trivial amount of processing. Should we do something like this too?) - netgroup.5: document all this stuff. - rcmd.c: some sleuthing with some test programs linked with my own version of innetgr() has revealed that SunOS always passes the NIS domain name to innetgr() in the 'domain' argument. We might as well do the same (if YP is defined). - ether_addr.c: also fix the NIS interaction so that placing the '+' token in the /etc/ethers file makes it seem like the NIS ethers data is 'inserted' at that point. (Chances are nobody will notice the effect of this change, which is just te way I like it. :)
161 lines
5.2 KiB
Groff
161 lines
5.2 KiB
Groff
.\" Copyright (c) 1992, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)netgroup.5 8.2 (Berkeley) 12/11/93
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.\"
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.Dd December 11, 1993
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.Dt NETGROUP 5
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.Os
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.Sh NAME
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.Nm netgroup
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.Nd defines network groups
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.Sh SYNOPSIS
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.Nm netgroup
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.Sh DESCRIPTION
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The
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.Nm netgroup
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file
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specifies ``netgroups'', which are sets of
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.Sy (host, user, domain)
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tuples that are to be given similar network access.
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.Pp
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Each line in the file
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consists of a netgroup name followed by a list of the members of the
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netgroup.
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Each member can be either the name of another netgroup or a specification
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of a tuple as follows:
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.Bd -literal -offset indent
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(host, user, domain)
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.Ed
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where the
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.Sy host ,
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.Sy user ,
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and
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.Sy domain
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are character string names for the corresponding component.
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Any of the comma separated fields may be empty to specify a ``wildcard'' value
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or may consist of the string ``-'' to specify ``no valid value''.
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The members of the list may be separated by whitespace and/or commas;
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the ``\e'' character may be used at the end of a line to specify
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line continuation.
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The functions specified in
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.Xr getnetgrent 3
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should normally be used to access the
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.Nm netgroup
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database.
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.Pp
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Lines that begin with a # are treated as comments.
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.Sh NIS/YP INTERACTION
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On most other platforms,
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.Nm netgroups
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are only used in conjunction with
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NIS and local
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.Pa /etc/netgroup
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files are ignored. With FreeBSD,
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.Nm netgroups
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can be used with either NIS or local files, but there are certain
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caveats to consider. The existing
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.Nm netgroup
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system is extremely inefficient where
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.Fn innetgr 3
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lookups are concerned since
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.Nm netgroup
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memberships are computed on the fly. By contrast, the NIS
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.Nm netgroup
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database consists of three seperate maps (netgroup, netgroup.byuser
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and netgroup.byhost) that are keyed to allow
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.Fn innetgr 3
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lookups to be done quickly. The FreeBSD
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.Nm netgroup
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system can interact with the NIS
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.Nm netgroup
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maps in the following ways:
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.Bl -bullet -offset indent
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.It
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If the
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.Pa /etc/netgroup
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file does not exist, or it exists and is empty, or
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it exists and contains only a '+', and NIS is running,
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.Nm netgroup
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lookups will be done exclusively through NIS, with
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.Fn innetgr 3
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taking advantage of the netgroup.byuser and
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netgroup.byhost maps to speed up searches. (This
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is more or less compatible with the behavior of SunOS and
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similar platforms.)
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.It
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If the
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.Pa /etc/netgroup
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exists and contains only local
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.Nm netgroup
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information (with no NIS '+' token), then only the local
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.Nm netgroup
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information will be processed (and NIS will be ingored).
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.It
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If
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.Pa /etc/netgroup
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exists and contains both local netgroup data
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.Pa and
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the NIS '+' token, the local data and the NIS netgroup
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map will be processed as a single combined
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.Nm netgroup
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database. While this configuration is the most flexible, it
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is also the least efficient: in particular,
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.Fn innetgr 3
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lookups will be especially slow if the
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database is large.
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.El
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.Sh FILES
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.Bl -tag -width /etc/netgroup -compact
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.It Pa /etc/netgroup
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the netgroup database.
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.El
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.Sh SEE ALSO
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.Xr getnetgrent 3 ,
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.Xr exports 5
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.Sh COMPATIBILITY
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The file format is compatible with that of various vendors, however it
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appears that not all vendors use an identical format.
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.Sh BUGS
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The interpretation of access restrictions based on the member tuples of a
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netgroup is left up to the various network applications.
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Also, it is not obvious how the domain specification
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applies to the BSD environment.
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.Pp
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The
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.Nm netgroup
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database should be stored in the form of a
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hashed
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.Xr db 3
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database just like the
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.Xr passwd 5
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database to speed up reverse lookups.
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