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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | LINKING | SEE ALSO | COLOPHON |
KEYCTL_SETPERM(3) Linux Key Management Calls KEYCTL_SETPERM(3)
keyctl_setperm - change the permissions mask on a key
#include <keyutils.h>
long keyctl_setperm(key_serial_t key, key_perm_t perm);
keyctl_setperm() changes the permissions mask on a key.
A process that does not have the SysAdmin capability may not change
the permissions mask on a key that doesn't have the same UID as the
caller.
The caller must have setattr permission on a key to be able change
its permissions mask.
The permissions mask is a bitwise-OR of the following flags:
KEY_xxx_VIEW
Grant permission to view the attributes of a key.
KEY_xxx_READ
Grant permission to read the payload of a key or to list a
keyring.
KEY_xxx_WRITE
Grant permission to modify the payload of a key or to add or
remove links to/from a keyring.
KEY_xxx_SEARCH
Grant permission to find a key or to search a keyring.
KEY_xxx_LINK
Grant permission to make links to a key.
KEY_xxx_SETATTR
Grant permission to change the ownership and permissions
attributes of a key.
KEY_xxx_ALL
Grant all the above.
The 'xxx' in the above should be replaced by one of:
POS Grant the permission to a process that possesses the key (has
it attached searchably to one of the process's keyrings).
USR Grant the permission to a process with the same UID as the
key.
GRP Grant the permission to a process with the same GID as the
key, or with a match for the key's GID amongst that process's
Groups list.
OTH Grant the permission to any other process.
Examples include: KEY_POS_VIEW, KEY_USR_READ, KEY_GRP_SEARCH and
KEY_OTH_ALL.
User, group and other grants are exclusive: if a process qualifies in
the 'user' category, it will not qualify in the 'groups' category;
and if a process qualifies in either 'user' or 'groups' then it will
not qualify in the 'other' category.
Possessor grants are cumulative with the grants from the 'user',
'groups' and 'other' categories.
On success keyctl_setperm() returns 0 . On error, the value -1 will
be returned and errno will have been set to an appropriate error.
ENOKEY The specified key does not exist.
EKEYEXPIRED
The specified key has expired.
EKEYREVOKED
The specified key has been revoked.
EACCES The named key exists, but does not grant setattr permission to
the calling process.
This is a library function that can be found 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 2017-07-05. 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_SETPERM(3)
Pages that refer to this page: keyctl(2), keyctl(3), keyrings(7)