1KEYCTL_GET_SECURITY(3) Linux Key Management Calls KEYCTL_GET_SECURITY(3)
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6 keyctl_get_security - retrieve a key's security context
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9 #include <keyutils.h>
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11 long keyctl_get_security(key_serial_t key, char *buffer,
12 size_t buflen);
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14 long keyctl_get_security_alloc(key_serial_t key, char **_buffer);
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17 keyctl_get_security() retrieves the security context of a key as a NUL-
18 terminated string. This will be rendered in a form appropriate to the
19 LSM in force - for instance, with SELinux, it may look like
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21 unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
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23 The caller must have view permission on a key to be able to get its
24 security context.
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26 buffer and buflen specify the buffer into which the string will be
27 placed. If the buffer is too small, the full size of the string will
28 be returned, and no copy will take place.
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30 keyctl_get_security_alloc() is similar to keyctl_get_security() except
31 that it allocates a buffer big enough to hold the string and copies the
32 string into it. If successful, A pointer to the buffer is placed in
33 *_buffer. The caller must free the buffer.
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36 On success keyctl_get_security() returns the amount of data placed into
37 the buffer. If the buffer was too small, then the size of buffer
38 required will be returned, but no data will be transferred. On error,
39 the value -1 will be returned and errno will have been set to an appro‐
40 priate error.
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42 On success keyctl_get_security_alloc() returns the amount of data in
43 the buffer, less the NUL terminator. On error, the value -1 will be
44 returned and errno will have been set to an appropriate error.
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47 ENOKEY The key specified is invalid.
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49 EKEYEXPIRED
50 The key specified has expired.
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52 EKEYREVOKED
53 The key specified had been revoked.
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55 EACCES The key exists, but is not viewable by the calling process.
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58 This is a library function that can be found in libkeyutils. When
59 linking, -lkeyutils should be specified to the linker.
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62 keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
63 keyrings(7), keyutils(7)
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67Linux 26 Feb 2010 KEYCTL_GET_SECURITY(3)