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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | LINKING | SEE ALSO | COLOPHON |
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KEYCTL_SEARCH(3) Linux Key Management Calls KEYCTL_SEARCH(3)
keyctl_search - search a keyring for a key
#include <keyutils.h>
long keyctl_search(key_serial_t keyring, const char *type,
const char *description, key_serial_t destination);
keyctl_search() recursively searches the keyring for a key of the
specified type and description.
If found, the key will be attached to the destination keyring (if
given), and its serial number will be returned.
The source keyring must grant search permission to the caller, and
for a key to be found, it must also grant search permission to the
caller. Child keyrings will be only be recursively searched if
they grant search permission to the caller as well.
If the destination keyring is zero, no attempt will be made to
forge a link to the key, and just the serial number will be
returned.
If the destination keyring is given, then the link may only be
formed if the found key grants the caller link permission and the
destination keyring grants the caller write permission.
If the search is successful, and if the destination keyring
already contains a link to a key that matches the specified type
and description, then that link will be replaced by a link to the
found key.
The source keyring and destination keyring serial numbers may be
those of valid keyrings to which the caller has appropriate
permission, or they may be special keyring IDs:
KEY_SPEC_THREAD_KEYRING
This specifies the caller's thread-specific keyring.
KEY_SPEC_PROCESS_KEYRING
This specifies the caller's process-specific keyring.
KEY_SPEC_SESSION_KEYRING
This specifies the caller's session-specific keyring.
KEY_SPEC_USER_KEYRING
This specifies the caller's UID-specific keyring.
KEY_SPEC_USER_SESSION_KEYRING
This specifies the caller's UID-session keyring.
On success keyctl_search() returns the serial number of the key it
found. On error, the value -1 will be returned and errno will
have been set to an appropriate error.
ENOKEY One of the keyrings doesn't exist, no key was found by the
search, or the only key found by the search was a negative
key.
ENOTDIR
One of the keyrings is a valid key that isn't a keyring.
EKEYEXPIRED
One of the keyrings has expired, or the only key found was
expired.
EKEYREVOKED
One of the keyrings has been revoked, or the only key found
was revoked.
ENOMEM Insufficient memory to expand the destination keyring.
EDQUOT The key quota for this user would be exceeded by creating a
link to the found key in the destination keyring.
EACCES The source keyring didn't grant search permission, the
destination keyring didn't grant write permission or the
found key didn't grant link permission to the caller.
Although this is a Linux system call, it is not present in libc
but can be found rather in libkeyutils. When linking, -lkeyutils
should be specified to the linker.
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
keyrings(7), keyutils(7)
This page is part of the keyutils (key management utilities)
project. Information about the project can be found at [unknown
-- if you know, please contact man-pages@man7.org] If you have a
bug report for this manual page, send it to
keyrings@linux-nfs.org. This page was obtained from the project's
upstream Git repository
⟨http://git.kernel.org/pub/scm/linux/kernel/git/dhowells/keyutils.git⟩
on 2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2023-03-20.) 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 4 May 2006 KEYCTL_SEARCH(3)
Pages that refer to this page: KEYCTL_SEARCH(2const), keyctl(3), keyrings(7)
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HTML rendering created 2025-09-06 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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