получить контекст безопасности ключа (retrieve a key's security context)
Имя (Name)
keyctl_get_security - retrieve a key's security context
Синопсис (Synopsis)
#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);
Описание (Description)
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.
Возвращаемое значение (Return value)
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.
Ошибки (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The key specified had been revoked.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.
Ссылки (Linking)
This is a library function that can be found in libkeyutils.
When linking, -lkeyutils should be specified to the linker.
Смотри также (See also)
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
keyrings(7), keyutils(7)
