mirror of https://github.com/mkerrisk/man-pages
user-session-keyring.7: New page adopted from keyutils
Since this page documents kernel-user-space interfaces, it makes sense to have it as part of man-pages, rather than the keyutils package. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
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.\" Written by David Howells (dhowells@redhat.com)
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.\"
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.\" This program is free software; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public Licence
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.\" as published by the Free Software Foundation; either version
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.\" 2 of the Licence, or (at your option) any later version.
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.\"
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.TH "USER-SESSION KEYRING" 7 "20 Feb 2014" Linux "Kernel key management"
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.\"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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.SH NAME
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user_session_keyring \- Per-user default session keyring
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.SH DESCRIPTION
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The
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.B user session keyring
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is a keyring used to anchor keys on behalf of a user. Each UID the kernel
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deals with has its own user session keyring. This keyring is associated with
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the record that the kernel maintains for the UID and, once created, is retained
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as long as that record persists. It is shared amongst all processes of that
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UID.
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.P
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The user session keyring is created on demand when a thread requests it or when
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a thread asks for its \fBsession keyring\fP and that doesn't exist. In the
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latter case, a user session keyring will be created and, if the session keyring
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wasn't to be created, the user session keyring will be set as the process's
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actual session keyring.
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.P
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The user session keyring is searched by \fBrequest_key\fP() if the actual
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session keyring does not exist and is ignored otherwise.
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.P
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A special serial number value, \fBKEY_SPEC_USER_SESSION_KEYRING\fP, is defined
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that can be used in lieu of the calling process's user session keyring's actual
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serial number.
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.P
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From the keyctl utility, '\fB@us\fP' can be used instead of a numeric key ID in
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much the same way.
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.P
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User session keyrings are independent of clone(), fork(), vfork(), execve() and
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exit() excepting that the keyring is destroyed when the UID record is destroyed
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when the last process pinning it exits.
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.P
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If a user session keyring does not exist when it is accessed, it will be
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created.
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.P
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It is strongly recommended that a \fBsession keyring\fP be set explicitly, for
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example by \fBpam_keyinit\fP, rather than relying on the user session keyring -
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particularly if a process is running as root.
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.\"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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.SH SEE ALSO
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.BR keyctl (1),
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.br
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.BR keyctl (3),
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.br
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.BR keyrings (7),
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.br
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.BR process-keyring (7),
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.br
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.BR session-keyring (7),
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.br
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.BR thread-keyring (7),
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.br
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.BR user-keyring (7),
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.br
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.BR persistent-keyring (7)
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