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| author | Roberto Sassu <roberto.sassu@polito.it> | 2010-10-06 18:31:32 +0200 |
|---|---|---|
| committer | Tyler Hicks <tyhicks@linux.vnet.ibm.com> | 2010-10-29 10:31:36 -0500 |
| commit | f16feb5119a87f5e683be7e8916c060abfb0e8d6 (patch) | |
| tree | ed80e0f8d2d8c5b63c8b48e11da4eca0163bb9f4 | |
| parent | 39fac853a758306285404368fbe392408057b136 (diff) | |
| download | blackbird-op-linux-f16feb5119a87f5e683be7e8916c060abfb0e8d6.tar.gz blackbird-op-linux-f16feb5119a87f5e683be7e8916c060abfb0e8d6.zip | |
ecryptfs: added ecryptfs_mount_auth_tok_only mount parameter
This patch adds a new mount parameter 'ecryptfs_mount_auth_tok_only' to
force ecryptfs to use only authentication tokens which signature has
been specified at mount time with parameters 'ecryptfs_sig' and
'ecryptfs_fnek_sig'. In this way, after disabling the passthrough and
the encrypted view modes, it's possible to make available to users only
files encrypted with the specified authentication token.
Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Cc: Dustin Kirkland <kirkland@canonical.com>
Cc: James Morris <jmorris@namei.org>
[Tyler: Clean up coding style errors found by checkpatch]
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
| -rw-r--r-- | fs/ecryptfs/ecryptfs_kernel.h | 1 | ||||
| -rw-r--r-- | fs/ecryptfs/keystore.c | 9 | ||||
| -rw-r--r-- | fs/ecryptfs/main.c | 8 |
3 files changed, 17 insertions, 1 deletions
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h index 0032a9f5a3a9..59ab793fc01b 100644 --- a/fs/ecryptfs/ecryptfs_kernel.h +++ b/fs/ecryptfs/ecryptfs_kernel.h @@ -377,6 +377,7 @@ struct ecryptfs_mount_crypt_stat { #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040 +#define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080 u32 flags; struct list_head global_auth_tok_list; struct mutex global_auth_tok_list_mutex; diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c index e7f029f00c6b..b1f6858a5223 100644 --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -459,6 +459,15 @@ ecryptfs_find_auth_tok_for_sig( if (ecryptfs_find_global_auth_tok_for_sig(&global_auth_tok, mount_crypt_stat, sig)) { + /* if the flag ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY is set in the + * mount_crypt_stat structure, we prevent to use auth toks that + * are not inserted through the ecryptfs_add_global_auth_tok + * function. + */ + if (mount_crypt_stat->flags + & ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY) + return -EINVAL; + rc = ecryptfs_keyring_auth_tok_for_sig(auth_tok_key, auth_tok, sig); } else diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c index cbd4e18adb20..09eb5296aebb 100644 --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -208,7 +208,8 @@ enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata, ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig, ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes, - ecryptfs_opt_unlink_sigs, ecryptfs_opt_err }; + ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only, + ecryptfs_opt_err }; static const match_table_t tokens = { {ecryptfs_opt_sig, "sig=%s"}, @@ -223,6 +224,7 @@ static const match_table_t tokens = { {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"}, {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"}, {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"}, + {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"}, {ecryptfs_opt_err, NULL} }; @@ -406,6 +408,10 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options) case ecryptfs_opt_unlink_sigs: mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS; break; + case ecryptfs_opt_mount_auth_tok_only: + mount_crypt_stat->flags |= + ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY; + break; case ecryptfs_opt_err: default: printk(KERN_WARNING |
