193 lines
5.4 KiB
HTML
193 lines
5.4 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SESSION-KEYRING</TITLE>
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</HEAD><BODY>
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<H1>SESSION-KEYRING</H1>
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Section: Linux Programmer's Manual (7)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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session-keyring - session shared process keyring
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<A NAME="lbAC"> </A>
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<H2>DESCRIPTION</H2>
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The session keyring is a keyring used to anchor keys on behalf of a process.
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It is typically created by
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<B><A HREF="/cgi-bin/man/man2html?8+pam_keyinit">pam_keyinit</A></B>(8)
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when a user logs in and a link will be added that refers to the
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<B><A HREF="/cgi-bin/man/man2html?7+user-keyring">user-keyring</A></B>(7).
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Optionally, PAM may revoke the session keyring on logout.
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(In typical configurations, PAM does do this revocation.)
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The session keyring has the name (description)
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<I>_ses</I>.
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<P>
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A special serial number value,
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<B>KEY_SPEC_SESSION_KEYRING</B>,
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is defined that can be used in lieu of the actual serial number of
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the calling process's session keyring.
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<P>
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From the
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<B><A HREF="/cgi-bin/man/man2html?1+keyctl">keyctl</A></B>(1)
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utility, '<B>@s</B>' 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
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<B><A HREF="/cgi-bin/man/man2html?2+clone">clone</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+fork">fork</A></B>(2),
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and
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<B><A HREF="/cgi-bin/man/man2html?2+vfork">vfork</A></B>(2).
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The session keyring
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is preserved across
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<B><A HREF="/cgi-bin/man/man2html?2+execve">execve</A></B>(2),
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even when the executable is set-user-ID or set-group-ID or has capabilities.
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The session keyring is 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,
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under certain circumstances, the
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<B><A HREF="/cgi-bin/man/man2html?7+user-session-keyring">user-session-keyring</A></B>(7)
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will be attached as the session keyring
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and under others a new session keyring will be created.
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(See
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<B><A HREF="/cgi-bin/man/man2html?7+user-session-keyring">user-session-keyring</A></B>(7)
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for further details.)
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<A NAME="lbAD"> </A>
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<H3>Special operations</H3>
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The
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<I>keyutils</I>
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library provides the following special operations for manipulating
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session keyrings:
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<DL COMPACT>
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<DT id="1"><B><A HREF="/cgi-bin/man/man2html?3+keyctl_join_session_keyring">keyctl_join_session_keyring</A></B>(3)
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<DD>
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This operation allows the caller to change the session keyring
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that it subscribes to.
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The caller can join an existing keyring with a specified name (description),
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create a new keyring with a given name,
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or ask the kernel to create a new "anonymous"
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session keyring with the name "_ses".
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(This function is an interface to the
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<B><A HREF="/cgi-bin/man/man2html?2+keyctl">keyctl</A></B>(2)
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<B>KEYCTL_JOIN_SESSION_KEYRING</B>
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operation.)
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<DT id="2"><B><A HREF="/cgi-bin/man/man2html?3+keyctl_session_to_parent">keyctl_session_to_parent</A></B>(3)
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<DD>
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This operation allows the caller to make the parent process's
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session keyring to the same as its own.
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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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(This function is an interface to the
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<B><A HREF="/cgi-bin/man/man2html?2+keyctl">keyctl</A></B>(2)
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<B>KEYCTL_SESSION_TO_PARENT</B>
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operation.)
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</DL>
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<P>
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These operations are also exposed through the
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<B><A HREF="/cgi-bin/man/man2html?1+keyctl">keyctl</A></B>(1)
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utility as:
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<P>
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keyctl session
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keyctl session - [<prog> <arg1> <arg2> ...]
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keyctl session <name> [<prog> <arg1> <arg2> ...]
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<P>
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and:
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<P>
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keyctl new_session
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<A NAME="lbAE"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+keyctl">keyctl</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?3+keyctl">keyctl</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+keyctl_join_session_keyring">keyctl_join_session_keyring</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+keyctl_session_to_parent">keyctl_session_to_parent</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+keyrings">keyrings</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+persistent-keyring">persistent-keyring</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+process-keyring">process-keyring</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+thread-keyring">thread-keyring</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+user-keyring">user-keyring</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+user-session-keyring">user-session-keyring</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?8+pam_keyinit">pam_keyinit</A></B>(8)
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<A NAME="lbAF"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="3"><A HREF="#lbAB">NAME</A><DD>
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<DT id="4"><A HREF="#lbAC">DESCRIPTION</A><DD>
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<DL>
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<DT id="5"><A HREF="#lbAD">Special operations</A><DD>
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</DL>
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<DT id="6"><A HREF="#lbAE">SEE ALSO</A><DD>
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<DT id="7"><A HREF="#lbAF">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:09 GMT, March 31, 2021
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</BODY>
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</HTML>
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