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keys: Add capability-checking keyctl function

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Add a keyctl function that requests a set of capability bits to find out
what features are supported.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2019-05-30 14:53:10 +01:00
parent 4754620865
commit 45e0f30c30
4 changed files with 54 additions and 0 deletions
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14
include/uapi/linux/keyctl.h
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@@ -68,6 +68,7 @@
#define KEYCTL_PKEY_VERIFY 28 /* Verify a public key signature */
#define KEYCTL_RESTRICT_KEYRING 29 /* Restrict keys allowed to link to a keyring */
#define KEYCTL_MOVE 30 /* Move keys between keyrings */
#define KEYCTL_CAPABILITIES 31 /* Find capabilities of keyrings subsystem */
/* keyctl structures */
struct keyctl_dh_params {
@@ -115,4 +116,17 @@ struct keyctl_pkey_params {
#define KEYCTL_MOVE_EXCL 0x00000001 /* Do not displace from the to-keyring */
/*
* Capabilities flags. The capabilities list is an array of 8-bit integers;
* each integer can carry up to 8 flags.
*/
#define KEYCTL_CAPS0_CAPABILITIES 0x01 /* KEYCTL_CAPABILITIES supported */
#define KEYCTL_CAPS0_PERSISTENT_KEYRINGS 0x02 /* Persistent keyrings enabled */
#define KEYCTL_CAPS0_DIFFIE_HELLMAN 0x04 /* Diffie-Hellman computation enabled */
#define KEYCTL_CAPS0_PUBLIC_KEY 0x08 /* Public key ops enabled */
#define KEYCTL_CAPS0_BIG_KEY 0x10 /* big_key-type enabled */
#define KEYCTL_CAPS0_INVALIDATE 0x20 /* KEYCTL_INVALIDATE supported */
#define KEYCTL_CAPS0_RESTRICT_KEYRING 0x40 /* KEYCTL_RESTRICT_KEYRING supported */
#define KEYCTL_CAPS0_MOVE 0x80 /* KEYCTL_MOVE supported */
#endif /* _LINUX_KEYCTL_H */