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.\"
.IX Title "KRB.EXCL 5"
.TH KRB.EXCL 5 "2021-01-27" "OpenAFS" "AFS File Reference"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
krb.excl \- Lists exclusions for mapping kerberos principals to AFS identities
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fI/etc/openafs/server/krb.excl\fR is an optional file that resides on an OpenAFS
server and is used to list exceptions to the algorithm of mapping kerberos
principals to \s-1AFS\s0 identities. It contains the name of one or more
principals; each principal should be on a line by itself. If a principal
appears in this file, that principal will never be recognized by an
OpenAFS server as a local identity, even if the realm is specified as a
local realm in \fBkrb.conf\fR\|(5).
.PP
The principal names specified in this file must include the realm, and
should be in Kerberos 4 format. That is, specify \f(CW\*(C`user.inst@REALM\*(C'\fR, not
\&\f(CW\*(C`user/inst@REALM\*(C'\fR, \f(CW\*(C`user.inst\*(C'\fR, nor \f(CW\*(C`user/inst\*(C'\fR.
.SH "RATIONALE"
.IX Header "RATIONALE"
It is possible to use the \fBkrb.conf\fR\|(5) configuration file to specify
that multiple Kerberos realms can be considered `local' realms by OpenAFS
fileservers, and those realms can be used nearly interchangeably. A site
may list \f(CW\*(C`FOO.EXAMPLE.COM\*(C'\fR and \f(CW\*(C`BAR.EXAMPLE.COM\*(C'\fR to allow users to
access \s-1AFS\s0 by using Kerberos tickets from either \f(CW\*(C`FOO.EXAMPLE.COM\*(C'\fR or
\&\f(CW\*(C`BAR.EXAMPLE.COM\*(C'\fR, and be treated as \s-1AFS\s0 users local to that cell.
.PP
In many setups, one realm is really a `local' realm that is managed by the
\&\s-1AFS\s0 administrators, and another `foreign' realm is specified in
\&\fIkrb.conf\fR that is managed by someone else, but in the same organization.
In such a case, the principal names for users are the same, so users
should be able to use either realm to authenticate to \s-1AFS.\s0  However, the
principals for administrators are not the same between the two realms, and
so the administrators in the `foreign' realm should not be considered \s-1AFS\s0
administrators. Specifying the administrator principals in the `foreign'
realm prevents this, but still allows users to use either realm.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
The realms \f(CW\*(C`FOO.EXAMPLE.COM\*(C'\fR and \f(CW\*(C`AD.EXAMPLE.COM\*(C'\fR are configured to both
be local realms, but \f(CW\*(C`AD.EXAMPLE.COM\*(C'\fR should not be used by \s-1AFS\s0
administrators. The \s-1AFS\s0 administrators are \f(CW\*(C`admin\*(C'\fR and \f(CW\*(C`smith.admin\*(C'\fR.
\&\fIkrb.excl\fR contains:
.PP
.Vb 2
\&   admin@AD.EXAMPLE.COM
\&   smith.admin@AD.EXAMPLE.COM
.Ve
.PP
Now if someone authenticates with tickets for \f(CW\*(C`smith/admin@AD.EXAMPLE.COM\*(C'\fR,
they will not be recognized as the \f(CW\*(C`smith.admin\*(C'\fR \s-1AFS\s0 identity. However,
\&\f(CW\*(C`smith@AD.EXAMPLE.COM\*(C'\fR will be treated as the \f(CW\*(C`smith\*(C'\fR \s-1AFS\s0 identity, and
\&\f(CW\*(C`smith/admin@FOO.EXAMPLE.COM\*(C'\fR will still be treated as \f(CW\*(C`smith.admin\*(C'\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBkrb.conf\fR\|(5)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2010 Sine Nomine Associates
.PP
This documentation is covered by the \s-1BSD\s0 License as written in the
doc/LICENSE file. This man page was written by Andrew Deason for OpenAFS.