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 to 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 EKEYREVOKED The specified key has been revoked.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 firstname.lastname@example.org] If you have a bug report for this manual page, send it to email@example.com. This page was obtained from the project's upstream Git repository ⟨http://git.kernel.org/pub/scm/linux/kernel/git/dhowells/keyutils.git⟩ on 2021-08-27. (At that time, the date of the most recent commit that was found in the repository was 2020-07-07.) 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 firstname.lastname@example.org Linux 4 May 2006 KEYCTL_SETPERM(3)
Pages that refer to this page: keyctl(2), keyctl(3), keyrings(7)