брелок общего процесса сеанса (session shared process keyring)
Имя (Name)
session-keyring - session shared process keyring
Описание (Description)
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 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
Смотри также (See also)
keyctl(1), keyctl(3), keyctl_join_session_keyring(3),
keyctl_session_to_parent(3), keyrings(7), persistent-keyring(7),
process-keyring(7), thread-keyring(7), user-keyring(7),
user-session-keyring(7), pam_keyinit(8)
