1 # SPDX-License-Identifier: GPL-2.0-only
3 # Key management configuration
7 bool "Enable access key retention support"
8 select ASSOCIATIVE_ARRAY
10 This option provides support for retaining authentication tokens and
11 access keys in the kernel.
13 It also includes provision of methods by which such keys might be
14 associated with a process so that network filesystems, encryption
15 support and the like can find them.
17 Furthermore, a special type of key is available that acts as keyring:
18 a searchable sequence of keys. Each process is equipped with access
19 to five standard keyrings: UID-specific, GID-specific, session,
22 If you are unsure as to whether this is required, answer N.
26 depends on COMPAT && KEYS
28 config PERSISTENT_KEYRINGS
29 bool "Enable register of persistent per-UID keyrings"
32 This option provides a register of persistent per-UID keyrings,
33 primarily aimed at Kerberos key storage. The keyrings are persistent
34 in the sense that they stay around after all processes of that UID
35 have exited, not that they survive the machine being rebooted.
37 A particular keyring may be accessed by either the user whose keyring
38 it is or by a process with administrative privileges. The active
39 LSMs gets to rule on which admin-level processes get to access the
42 Keyrings are created and added into the register upon demand and get
43 removed if they expire (a default timeout is set upon creation).
46 bool "Large payload keys"
53 This option provides support for holding large keys within the kernel
54 (for example Kerberos ticket caches). The data may be stored out to
57 If you are unsure as to whether this is required, answer N.
60 tristate "TRUSTED KEYS"
61 depends on KEYS && TCG_TPM
65 select CRYPTO_HASH_INFO
67 This option provides support for creating, sealing, and unsealing
68 keys in the kernel. Trusted keys are random number symmetric keys,
69 generated and RSA-sealed by the TPM. The TPM only unseals the keys,
70 if the boot PCRs and other criteria match. Userspace will only ever
73 If you are unsure as to whether this is required, answer N.
76 tristate "ENCRYPTED KEYS"
85 This option provides support for create/encrypting/decrypting keys
86 in the kernel. Encrypted keys are kernel generated random numbers,
87 which are encrypted/decrypted with a 'master' symmetric key. The
88 'master' key can be either a trusted-key or user-key type.
89 Userspace only ever sees/stores encrypted blobs.
91 If you are unsure as to whether this is required, answer N.
93 config KEY_DH_OPERATIONS
94 bool "Diffie-Hellman operations on retained keys"
100 This option provides support for calculating Diffie-Hellman
101 public keys and shared secrets using values stored as keys
104 If you are unsure as to whether this is required, answer N.