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session-keyring.7: Various reworking and additions
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -16,64 +16,83 @@ session-keyring \- session shared process keyring
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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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.BR pam_keyinit (8)
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when a user logs in and a link will be
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added that refers to the
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when a user logs in and a link will be added that refers to the
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.BR user-keyring (7).
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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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A special serial number value,
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.BR KEY_SPEC_SESSION_KEYRING ,
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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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From the
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.BR keyctl (1)
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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
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.BR clone (2),
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.BR fork (2),
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and
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.BR vfork (2)
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and
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is retained across
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.BR execve (2)
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- even when the target executable is setuid or
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setgid.
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The session keyring will be destroyed when the last process that
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.BR vfork (2).
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The session keyring
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is preserved across
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.BR execve (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, 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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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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.BR user-session-keyring (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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.SS Special operations
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The keyutils library provides a number of special operations for manipulating
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The
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.I keyutils
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library provides the following special operations for manipulating
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session keyrings:
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.TP
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.BR keyctl_join_session_keyring (3)
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This operation allows the caller to change their session keyring.
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The caller can join an existing keyring by name,
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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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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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.BR keyctl (2)
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.B KEYCTL_JOIN_SESSION_KEYRING
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operation.)
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.TP
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.BR keyctl_session_to_parent (3)
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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.
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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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.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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(This function is an interface to the
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.BR keyctl (2)
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.B KEYCTL_SESSION_TO_PARENT
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operation.)
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.PP
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These operations are also exposed through the
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.BR keyctl (1)
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utility as:
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.nf
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.in +4n
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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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.in
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.fi
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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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.nf
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.in +4n
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keyctl new_session
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.in
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.fi
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.SH SEE ALSO
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.ad l
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.nh
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