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CentOS 7.0 - man page for keyctl_get_security (centos section 3)

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 ren- dered 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 *_buf- fer. 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 EKEYREVOKED The key specified had been revoked.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), request-key(8) Linux 26 Feb 2010 KEYCTL_GET_SECURITY(3)

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