1# 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. 72