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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | LINKING | SEE ALSO | COLOPHON |
KEYCTL_GET_SECURITY(3) Linux Key Management Calls KEYCTL_GET_SECURITY(3)
keyctl_get_security - retrieve a key's security context
#include <keyutils.h>
long keyctl_get_security(key_serial_t key, char *buffer,
size_t buflen);
long keyctl_get_security_alloc(key_serial_t key, char **_buffer);
keyctl_get_security() retrieves the security context of a key as a
NUL-terminated string. This will be rendered in a form appropriate
to the LSM in force - for instance, with SELinux, it may look like
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
The caller must have view permission on a key to be able to get its
security context.
buffer and buflen specify the buffer into which the string will be
placed. If the buffer is too small, the full size of the string will
be returned, and no copy will take place.
keyctl_get_security_alloc() is similar to keyctl_get_security()
except that it allocates a buffer big enough to hold the string and
copies the string into it. If successful, A pointer to the buffer is
placed in *_buffer. The caller must free the buffer.
On success keyctl_get_security() returns the amount of data placed
into the buffer. If the buffer was too small, then the size of
buffer required will be returned, but no data will be transferred.
On error, the value -1 will be returned and errno will have been set
to an appropriate error.
On success keyctl_get_security_alloc() returns the amount of data in
the buffer, less the NUL terminator. On error, the value -1 will be
returned and errno will have been set to an appropriate error.
ENOKEY The key specified is invalid.
EKEYEXPIRED
The key specified has expired.
EKEYREVOKED
The key specified had been revoked.
EACCES The key exists, but is not viewable by 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 26 Feb 2010 KEYCTL_GET_SECURITY(3)
Pages that refer to this page: keyctl(2), keyctl(3), keyrings(7)