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eCryptfs: verify authentication tokens before their use

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Authentication tokens content may change if another requestor calls the
update() method of the corresponding key. The new function
ecryptfs_verify_auth_tok_from_key() retrieves the authentication token from
the provided key and verifies if it is still valid before being used to
encrypt or decrypt an eCryptfs file.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
[tyhicks: Minor formatting changes]
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
This commit is contained in:
Roberto Sassu
2011-03-21 16:00:53 +01:00
committed by Tyler Hicks
parent 7762e230fd
commit 0e1fc5ef47
3 changed files with 135 additions and 81 deletions
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fs/ecryptfs/ecryptfs_kernel.h
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@@ -331,7 +331,6 @@ struct ecryptfs_global_auth_tok {
u32 flags;
struct list_head mount_crypt_stat_list;
struct key *global_auth_tok_key;
struct ecryptfs_auth_tok *global_auth_tok;
unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
};