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CentOS 5.2 |
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ecryptfs(7) |
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eCryptfs − an enterprise−class cryptographic filesystem for linux
mount −t ecryptfs [ SRC DIR ] [ DST DIR ] −o [ OPTIONS ]
eCryptfs is a POSIX-compliant enterprise-class stacked cryptographic filesystem for Linux. It is derived from Erez Zadok’s Cryptfs, implemented through the FiST framework for generating stacked filesystems. eCryptfs extends Cryptfs to provide advanced key management and policy features. eCryptfs stores cryptographic metadata in the header of each file written, so that encrypted files can be copied between hosts; the file will be decryptable with the proper key, and there is no need to keep track of any additional information aside from what is already in the encrypted file itself. Think of eCryptfs as a sort of "gnupgfs."
STANDARD
OPTIONS
key=(keytype):[Key Options]
Specify the type of key to be used when mounting eCryptfs.
ecryptfs_cipher=(cipher)
Specify the symmetric cipher to be used on a per file basis
ecryptfs_key_bytes=(key_bytes)
Specify the keysize to be used with the selected cipher. If the cipher only has one keysize the keysize does not need to be specified.
ecryptfs_passthrough
Allows for non-eCryptfs files to be read and written from within an eCryptfs mount. This option is turned off by default.
no_sig_cache
Do not check the mount key signature against the values in the user’s ~/.ecryptfs/sig−cache.txt file. This is useful for such things as non-interactive setup scripts, so that the mount helper does not stop and prompt the user in the event that the key sig is not in the cache.
ecryptfs_encrypted_view
This option, when set, will have eCryptfs return the encrypted versions of the lower files, rather than decrypt encrypted files and return the decrypted data from the lower files. This options is useful for such things as backup utilities.
ecryptfs_xattr
Store the metadata in the extended attribute of the lower files rather than the header region of the lower files.
verbosity=(level)
Set to ’1’ in order to get verbose output from the kernel module. As a word of caution, this will cause secret values to be written in the clear to the system log, so this options should only be used for debugging purposes.
KEY
OPTIONS
passwd=(passphrase)
The actual password is password. Since the password is visible to utilities (like âpsâ under Unix) this form should only be used where security is not important.
passwd_file=(filename)
The password should be specified in a file with passwd=(passphrase). It is highly reccomended that the file be stored on a secure medium such as a personal usb key.
passwd_fd=(file descriptor)
The password is specified through the specified file descriptor.
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passstdin |
The user types their passphrase in through stdin. |
salt=(hex value)
The salt should be specified as a 16 digit hex value.
keyfile=(filename)
The filename should be the filename of a file containing an RSA SSL key.
mount(8)
Do not run eCryptfs in higher verbosity levels unless you are doing so for the sole purpose of development, since secret values will be written out to the system log in that case.
Please send bug reports to the lead developer, an eCryptfs mailing list hosted from SourceForge, or to the SourceForge bug tracker for the eCryptfs project. For kernel bugs, please follow the procedure detailed in Documentation/oops−tracing.txt to help us figure out what is happening.
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ecryptfs(7) | |