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NAME | DESCRIPTION | SEE ALSO | COLOPHON |
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session-keyring(7) Miscellaneous Information Manual session-keyring(7)
session-keyring - session shared process keyring
The session keyring is a keyring used to anchor keys on behalf of
a process. It is typically created by pam_keyinit(8) when a user
logs in and a link will be added that refers to the
user-keyring(7). Optionally, PAM(7) may revoke the session
keyring on logout. (In typical configurations, PAM does do this
revocation.) The session keyring has the name (description)
_ses.
A special serial number value, KEY_SPEC_SESSION_KEYRING, is
defined that can be used in lieu of the actual serial number of
the calling process's session keyring.
From the keyctl(1) utility, '@s' can be used instead of a numeric
key ID in much the same way.
A process's session keyring is inherited across clone(2),
fork(2), and vfork(2). The session keyring is preserved across
execve(2), even when the executable is set-user-ID or set-group-
ID or has capabilities. The session keyring is destroyed when
the last process that refers to it exits.
If a process doesn't have a session keyring when it is accessed,
then, under certain circumstances, the user-session-keyring(7)
will be attached as the session keyring and under others a new
session keyring will be created. (See user-session-keyring(7)
for further details.)
Special operations
The keyutils library provides the following special operations
for manipulating session keyrings:
keyctl_join_session_keyring(3)
This operation allows the caller to change the session
keyring that it subscribes to. The caller can join an
existing keyring with a specified name (description),
create a new keyring with a given name, or ask the kernel
to create a new "anonymous" session keyring with the name
"_ses". (This function is an interface to the keyctl(2)
KEYCTL_JOIN_SESSION_KEYRING operation.)
keyctl_session_to_parent(3)
This operation allows the caller to make the parent
process's session keyring to the same as its own. For
this to succeed, the parent process must have identical
security attributes and must be single threaded. (This
function is an interface to the keyctl(2)
KEYCTL_SESSION_TO_PARENT operation.)
These operations are also exposed through the keyctl(1) utility
as:
keyctl session
keyctl session - [<prog> <arg1> <arg2> ...]
keyctl session <name> [<prog> <arg1> <arg2> ...]
and:
keyctl new_session
keyctl(1), keyctl(3), keyctl_join_session_keyring(3),
keyctl_session_to_parent(3), keyrings(7), PAM(7),
persistent-keyring(7), process-keyring(7), thread-keyring(7),
user-keyring(7), user-session-keyring(7), pam_keyinit(8)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 session-keyring(7)
Pages that refer to this page: add_key(2), keyctl(2), request_key(2), keyctl_join_session_keyring(3), keyctl_session_to_parent(3), systemd.exec(5), keyrings(7), keyutils(7), persistent-keyring(7), process-keyring(7), thread-keyring(7), user-keyring(7), user-session-keyring(7), pam_keyinit(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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