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Diffstat (limited to 'server/keytab-backend.8')
| -rw-r--r-- | server/keytab-backend.8 | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/server/keytab-backend.8 b/server/keytab-backend.8 new file mode 100644 index 0000000..56320a1 --- /dev/null +++ b/server/keytab-backend.8 @@ -0,0 +1,214 @@ +.\" Automatically generated by Pod::Man 4.09 (Pod::Simple 3.35) +.\" +.\" 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 <eagle@eyrie.org> +.SH "COPYRIGHT AND LICENSE" +.IX Header "COPYRIGHT AND LICENSE" +Copyright 2006\-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 SOFTWARE IS PROVIDED \*(L"AS IS\*(R", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.\s0 \s-1IN NO EVENT SHALL +THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE.\s0 +.PP +SPDX-License-Identifier: \s-1MIT\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 <https://www.eyrie.org/~eagle/software/wallet/>. |