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authorMimi Zohar <zohar@linux.vnet.ibm.com>2010-11-23 18:55:35 -0500
committerJames Morris <jmorris@namei.org>2010-11-29 08:55:29 +1100
commit7e70cb4978507cf31d76b90e4cfb4c28cad87f0c (patch)
treec5df493eef8d30dcb40d647b0528970eb4a391c6 /security/Kconfig
parentd00a1c72f7f4661212299e6cb132dfa58030bcdb (diff)
downloadlinaro-lsk-7e70cb4978507cf31d76b90e4cfb4c28cad87f0c.tar.gz
keys: add new key-type encrypted
Define a new kernel key-type called 'encrypted'. Encrypted keys are kernel generated random numbers, which are encrypted/decrypted with a 'trusted' symmetric key. Encrypted keys are created/encrypted/decrypted in the kernel. Userspace only ever sees/stores encrypted blobs. Changelog: - bug fix: replaced master-key rcu based locking with semaphore (reported by David Howells) - Removed memset of crypto_shash_digest() digest output - Replaced verification of 'key-type:key-desc' using strcspn(), with one based on string constants. - Moved documentation to Documentation/keys-trusted-encrypted.txt - Replace hash with shash (based on comments by David Howells) - Make lengths/counts size_t where possible (based on comments by David Howells) Could not convert most lengths, as crypto expects 'unsigned int' (size_t: on 32 bit is defined as unsigned int, but on 64 bit is unsigned long) - Add 'const' where possible (based on comments by David Howells) - allocate derived_buf dynamically to support arbitrary length master key (fixed by Roberto Sassu) - wait until late_initcall for crypto libraries to be registered - cleanup security/Kconfig - Add missing 'update' keyword (reported/fixed by Roberto Sassu) - Free epayload on failure to create key (reported/fixed by Roberto Sassu) - Increase the data size limit (requested by Roberto Sassu) - Crypto return codes are always 0 on success and negative on failure, remove unnecessary tests. - Replaced kzalloc() with kmalloc() Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: David Safford <safford@watson.ibm.com> Reviewed-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/Kconfig')
-rw-r--r--security/Kconfig16
1 files changed, 16 insertions, 0 deletions
diff --git a/security/Kconfig b/security/Kconfig
index 24b8f9b491b..95accd442d5 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -36,6 +36,22 @@ config TRUSTED_KEYS
If you are unsure as to whether this is required, answer N.
+config ENCRYPTED_KEYS
+ tristate "ENCRYPTED KEYS"
+ depends on KEYS && TRUSTED_KEYS
+ select CRYPTO_AES
+ select CRYPTO_CBC
+ select CRYPTO_SHA256
+ select CRYPTO_RNG
+ help
+ This option provides support for create/encrypting/decrypting keys
+ in the kernel. Encrypted keys are kernel generated random numbers,
+ which are encrypted/decrypted with a 'master' symmetric key. The
+ 'master' key can be either a trusted-key or user-key type.
+ Userspace only ever sees/stores encrypted blobs.
+
+ If you are unsure as to whether this is required, answer N.
+
config KEYS_DEBUG_PROC_KEYS
bool "Enable the /proc/keys file by which keys may be viewed"
depends on KEYS