.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.26) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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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 "AUTHOR" .IX Header "AUTHOR" Russ Allbery .SH "COPYRIGHT AND LICENSE" .IX Header "COPYRIGHT AND LICENSE" Copyright 2006, 2007, 2008, 2010, 2013 The Board of Trustees of the Leland Stanford Junior University .PP Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the \*(L"Software\*(R"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: .PP The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. .PP \&\s-1THE\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1PROVIDED\s0 \*(L"\s-1AS\s0 \s-1IS\s0\*(R", \s-1WITHOUT\s0 \s-1WARRANTY\s0 \s-1OF\s0 \s-1ANY\s0 \s-1KIND\s0, \s-1EXPRESS\s0 \s-1OR\s0 \&\s-1IMPLIED\s0, \s-1INCLUDING\s0 \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0 \s-1THE\s0 \s-1WARRANTIES\s0 \s-1OF\s0 \s-1MERCHANTABILITY\s0, \&\s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0 \s-1AND\s0 \s-1NONINFRINGEMENT\s0. \s-1IN\s0 \s-1NO\s0 \s-1EVENT\s0 \s-1SHALL\s0 \&\s-1THE\s0 \s-1AUTHORS\s0 \s-1OR\s0 \s-1COPYRIGHT\s0 \s-1HOLDERS\s0 \s-1BE\s0 \s-1LIABLE\s0 \s-1FOR\s0 \s-1ANY\s0 \s-1CLAIM\s0, \s-1DAMAGES\s0 \s-1OR\s0 \s-1OTHER\s0 \&\s-1LIABILITY\s0, \s-1WHETHER\s0 \s-1IN\s0 \s-1AN\s0 \s-1ACTION\s0 \s-1OF\s0 \s-1CONTRACT\s0, \s-1TORT\s0 \s-1OR\s0 \s-1OTHERWISE\s0, \s-1ARISING\s0 \&\s-1FROM\s0, \s-1OUT\s0 \s-1OF\s0 \s-1OR\s0 \s-1IN\s0 \s-1CONNECTION\s0 \s-1WITH\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1OR\s0 \s-1THE\s0 \s-1USE\s0 \s-1OR\s0 \s-1OTHER\s0 \&\s-1DEALINGS\s0 \s-1IN\s0 \s-1THE\s0 \s-1SOFTWARE\s0. .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 .