mirror of https://github.com/mkerrisk/man-pages
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 "SESSION KEYRING" 7 "19 Feb 2014" Linux "Kernel key management"
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.\"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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.SH NAME
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session_keyring \- Session shared process keyring
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.SH DESCRIPTION
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The
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.B session keyring
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is a keyring used to anchor keys on behalf of a process. It is typically
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created by the \fBpam_keyinit\fP module when a user logs in and a link will be
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added that refers to the \fBuser keyring\fP.
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.P
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A special serial number value, \fBKEY_SPEC_SESSION_KEYRING\fP, is defined that
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can be used in lieu of the calling process's session keyring's actual serial
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number.
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.P
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From the keyctl utility, '\fB@s\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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A process's session keyring is inherited across clone(), fork() and vfork() and
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is retained across execve() - even when the target executable is setuid or
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setgid. The session keyring will be destroyed when the last process that
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refers to it exits.
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.P
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If a process doesn't have a session keyring when it is accessed, then, under
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certain circumstances, the \fBuser session keyring\fR will be attached as the
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session keyring and under others a new session keyring will be created.
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.SH SPECIAL OPERATIONS
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The keyutils library provides a number of special operations for manipulating
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session keyrings:
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.IP \fBkeyctl_join_session_keyring\fP()
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This operation allows the caller to change their session keyring. The caller
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can join an existing keyring by name, create a new keyring of the name given or
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ask the kernel to create a new session keyring with the name "_ses".
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.IP \fBkeyctl_session_to_parent\fP()
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This operation allows the caller to set the parent process's session keyring to
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the same as their own. For this to succeed, the parent process must have
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identical security attributes and must be single threaded.
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.P
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These operations are also exposed through the keyctl utility as:
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.P
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.RS
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\fBkeyctl\fP session
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.br
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\fBkeyctl\fP session - [<prog> <arg1> <arg2> ...]
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.br
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\fBkeyctl\fP session <name> [<prog> <arg1> <arg2> ...]
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.RE
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.P
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and:
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.P
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.RS
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\fBkeyctl\fP new_session
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.RE
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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 keyctl_join_session_keyring (3),
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.br
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.BR keyctl_session_to_parent (3),
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.br
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.BR pam_keyinit (8),
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.br
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.BR keyrings (7),
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.br
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.BR thread-keyring (7),
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.br
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.BR process-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 user-session-keyring (7)
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.br
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.BR persistent-keyring (7)
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