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.\" ========================================================================
.\"
.IX Title "KEYTAB-BACKEND 8"
.TH KEYTAB-BACKEND 8 "2010-03-08" "0.11" "wallet"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
keytab\-backend \- Extract keytabs from the KDC without changing the key
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBkeytab-backend\fR retrieve \fIprincipal\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBkeytab-backend\fR retrieves a keytab for an existing principal from the
\&\s-1KDC\s0 database without changing the current key. It allows generation of a
keytab for a service without rekeying that service. It requires a
\&\fBkadmin.local\fR patched to support the \fB\-norandkey\fR option to \fBktadd\fR.
.PP
This script is intended to run under \fBremctld\fR. On success, it prints
the keytab to standard output, logs a success message to syslog (facility
auth, priority info), and exits with status 0. On failure, it prints out
an error message, logs an error to syslog (facility auth, priority err),
and exits with a non-zero status.
.PP
The principal is checked for basic sanity (only accepting alphanumerics,
\&\f(CW\*(C`_\*(C'\fR, and \f(CW\*(C`\-\*(C'\fR with an optional instance and then only alphanumerics,
\&\f(CW\*(C`_\*(C'\fR, \f(CW\*(C`\-\*(C'\fR, and \f(CW\*(C`.\*(C'\fR in the realm) and then checked against a
configuration file that lists regexes of principals that can be retrieved.
When deploying this software, limit as tightly as possible which
principals can be downloaded in this fashion. Generally only shared
service principals used on multiple systems should be made available in
this way.
.PP
\&\fBkeytab-backend\fR does not do any authorization checks. Those should be
done by \fBremctld\fR before it is called.
.SH "FILES"
.IX Header "FILES"
.IP "\fI/etc/krb5kdc/allow\-extract\fR" 4
.IX Item "/etc/krb5kdc/allow-extract"
The configuration file that controls which principals can have their
keytabs retrieved. Blank lines and lines starting with \f(CW\*(C`#\*(C'\fR, as well as
anything after \f(CW\*(C`#\*(C'\fR on a line, are ignored. All other lines should be
Perl regular expressions, one per line, that match principals whose
keytabs can be retrieved by \fBkeytab-backend\fR. Any principal that does
not match one of those regular expressions cannot be retrieved.
.IP "\fI/var/lib/keytabs\fR" 4
.IX Item "/var/lib/keytabs"
The temporary directory used for creating keytabs. \fBkeytab-backend\fR will
create the keytab in this directory, make sure that was successful, and
then delete the temporary file after the results have been sent to
standard output.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIkadmin.local\fR\|(8), \fIremctld\fR\|(8)
.PP
This program is part of the wallet system. The current version is
available from <http://www.eyrie.org/~eagle/software/wallet/>.
.SH "AUTHOR"
.IX Header "AUTHOR"
Russ Allbery <rra@stanford.edu>
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