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David Howellsf0894942012-05-11 10:56:56 +01001#
2# Key management configuration
3#
4
5config KEYS
6 bool "Enable access key retention support"
7 help
8 This option provides support for retaining authentication tokens and
9 access keys in the kernel.
10
11 It also includes provision of methods by which such keys might be
12 associated with a process so that network filesystems, encryption
13 support and the like can find them.
14
15 Furthermore, a special type of key is available that acts as keyring:
16 a searchable sequence of keys. Each process is equipped with access
17 to five standard keyrings: UID-specific, GID-specific, session,
18 process and thread.
19
20 If you are unsure as to whether this is required, answer N.
21
22config TRUSTED_KEYS
23 tristate "TRUSTED KEYS"
24 depends on KEYS && TCG_TPM
25 select CRYPTO
26 select CRYPTO_HMAC
27 select CRYPTO_SHA1
28 help
29 This option provides support for creating, sealing, and unsealing
30 keys in the kernel. Trusted keys are random number symmetric keys,
31 generated and RSA-sealed by the TPM. The TPM only unseals the keys,
32 if the boot PCRs and other criteria match. Userspace will only ever
33 see encrypted blobs.
34
35 If you are unsure as to whether this is required, answer N.
36
37config ENCRYPTED_KEYS
38 tristate "ENCRYPTED KEYS"
39 depends on KEYS
40 select CRYPTO
41 select CRYPTO_HMAC
42 select CRYPTO_AES
43 select CRYPTO_CBC
44 select CRYPTO_SHA256
45 select CRYPTO_RNG
46 help
47 This option provides support for create/encrypting/decrypting keys
48 in the kernel. Encrypted keys are kernel generated random numbers,
49 which are encrypted/decrypted with a 'master' symmetric key. The
50 'master' key can be either a trusted-key or user-key type.
51 Userspace only ever sees/stores encrypted blobs.
52
53 If you are unsure as to whether this is required, answer N.
54
55config KEYS_DEBUG_PROC_KEYS
56 bool "Enable the /proc/keys file by which keys may be viewed"
57 depends on KEYS
58 help
59 This option turns on support for the /proc/keys file - through which
60 can be listed all the keys on the system that are viewable by the
61 reading process.
62
63 The only keys included in the list are those that grant View
64 permission to the reading process whether or not it possesses them.
65 Note that LSM security checks are still performed, and may further
66 filter out keys that the current process is not authorised to view.
67
68 Only key attributes are listed here; key payloads are not included in
69 the resulting table.
70
71 If you are unsure as to whether this is required, answer N.