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+.\" ========================================================================
+.\"
+.IX Title "WALLET-UNKNOWN-HOSTS 8"
+.TH WALLET-UNKNOWN-HOSTS 8 "2018-06-04" "1.4" "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"
+wallet\-unknown\-hosts \- Report host keytabs in wallet for unknown hosts
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+\&\fBwallet-unknown-hosts\fR check
+.PP
+\&\fBwallet-unknown-hosts\fR report \fImin\fR \fIdate\fR
+.PP
+env REMOTE_USER=\fIprincipal\fR \fBwallet-unknown-hosts\fR purge \fImin\fR \fIdate\fR
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fBwallet-unknown-hosts\fR constructs a database recording host-based keytabs
+in wallet whose corresponding hosts are not found in \s-1DNS.\s0 It records in
+that database the number of times the host wasn't found and the timestamp
+of the first time it was not found. It can then generate a report of
+host-based keytab objects that have not been found for a minimum number of
+consecutive times and which were last found longer ago than a particular
+date. Finally, it can purge from wallet all objects that meet those
+requirements.
+.PP
+When run with the \f(CW\*(C`check\*(C'\fR argument, \fBwallet-unknown-hosts\fR traverses the
+wallet database looking for host-based keytabs, which it recognizes by
+looking for keytab objects for principals with at least one period (\f(CW\*(C`.\*(C'\fR)
+after a slash (\f(CW\*(C`/\*(C'\fR). It then applies a local check followed by a \s-1DNS\s0
+check. The \s-1DNS\s0 check is only successful (only considers the host to be
+found) if it resolves to an \s-1IP\s0 address (possibly through a \s-1CNAME\s0).
+.PP
+For any host that's not found, it records that host in its associated
+database. If this is the first time it wasn't found, it records the first
+missing time as the current time and the missing count as 1. If it
+previously wasn't found, it just increments the missing count.
+.PP
+For any host that is found, it deletes any record for that keytab from the
+database.
+.PP
+When run with the \f(CW\*(C`report\*(C'\fR argument, \fBwallet-unknown-hosts\fR takes two
+additional arguments: \fImin\fR and \fIdate\fR. \fImin\fR is the minimum number of
+times that a host must be found missing for the corresponding keytabs to
+show up on the report. \fIdate\fR is a cutoff date in seconds since epoch;
+keytabs will not be included in the report unless their first missing date
+is older than \fIdate\fR. The output will be the name component of the
+keytab objects in the wallet that correspond to unknown hosts and meet
+those thresholds.
+.PP
+When run with the \f(CW\*(C`purge\*(C'\fR argument, \fBwallet-unknown-hosts\fR will build a
+list of keytab objects the same as with the \f(CW\*(C`report\*(C'\fR argument, using the
+same additional arguments, but rather than printing them out will instead
+delete them from the wallet database. To run \f(CW\*(C`purge\*(C'\fR, the environment
+variable \s-1REMOTE_USER\s0 must be set to a principal that's a member of the
+\&\f(CW\*(C`ADMIN\*(C'\fR \s-1ACL.\s0
+.SH "BUGS"
+.IX Header "BUGS"
+\&\fBwallet-unknown-hosts\fR doesn't have any facility to purge from its
+database all objects that are no longer in the wallet.
+.PP
+Having to specify an identity for purge mode is an artifact of the
+Wallet::Server \s-1API\s0 and needs to be fixed by providing some way to perform
+actions as a local administrator.
+.SH "AUTHOR"
+.IX Header "AUTHOR"
+Russ Allbery <eagle@eyrie.org>
+.SH "COPYRIGHT AND LICENSE"
+.IX Header "COPYRIGHT AND LICENSE"
+Copyright 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