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Valient Gough
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260
encfs/encfs.pod
260
encfs/encfs.pod
@ -16,12 +16,13 @@ encfs - mounts or creates an encrypted virtual filesystem
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=head1 SYNOPSIS
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B<encfs> [B<--version>] [B<-s>] [B<-f>] [B<-v>|B<--verbose>]
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[B<-i MINUTES>|B<--idle=MINUTES>] [B<--extpass=program>]
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[B<-S>|B<--stdinpass>] [B<--anykey>] [B<--forcedecode>]
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[B<-d>|B<--fuse-debug>] [B<--public>] [B<--no-default-flags>]
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[B<--ondemand>] [B<--delaymount>] [B<--reverse>] [B<--standard>]
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[B<-o FUSE_OPTION>]
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B<encfs> [B<--version>] [B<-v>|B<--verbose>] [B<-t>|B<--syslogtag>]
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[B<-s>] [B<-f>] [B<--annotate>] [B<--standard>] [B<--paranoia>]
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[B<--reverse>] [B<--extpass=program>] [B<-S>|B<--stdinpass>]
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[B<--anykey>] [B<--forcedecode>] [B<-require-macs>]
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[B<-i MINUTES>|B<--idle=MINUTES>] [B<-m>|B<--ondemand>] [B<--delaymount>]
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[B<--public>] [B<--nocache>] [B<--no-default-flags>]
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[B<-o FUSE_OPTION>] [B<-d>|B<--fuse-debug>] [B<-H>|B<--fuse-help>]
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I<rootdir> I<mountPoint>
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[B<--> [I<Fuse Mount Options>]]
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@ -42,22 +43,10 @@ may be an increasing number of choices.
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=over 4
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=item B<-i>, B<--idle=MINUTES>
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=item B<--version>
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Enable automatic unmount of the filesystem after a period of inactivity. The
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period is specified in minutes, so the shortest timeout period that can be
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requested is one minute. B<EncFS> will not automatically unmount if there are
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files open within the filesystem, even if they are open in read-only mode.
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However simply having files open does not count as activity.
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=item B<-f>
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The B<-f> (I<foreground>) option causes B<EncFS> to run in the foreground.
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Normally B<EncFS> spawns off as a daemon and runs in the background, returning
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control to the spawning shell. With the B<-f> option, it will run in the
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foreground and any warning/debug log messages will be displayed on standard
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error. In the default (background) mode, all log messages are logged via
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syslog.
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Shows B<EncFS> version. Using B<--verbose> before B<--version> may display
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additional information.
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=item B<-v>, B<--verbose>
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@ -78,62 +67,31 @@ mode. By default, B<EncFS> runs in multi-threaded mode. This option is used
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during B<EncFS> development in order to simplify debugging and allow it to run
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under memory checking tools.
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=item B<-d>, B<--fuse-debug>
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=item B<-f>
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Enables debugging within the B<FUSE> library. This should only be used if you
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suspect a problem within B<FUSE> itself (not B<EncFS>), as it generates a lot
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of low-level data and is not likely to be very helpful in general problem
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tracking. Try I<verbose> mode (B<-v>) first, which gives a higher level view
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of what is happening within B<EncFS>.
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The B<-f> (I<foreground>) option causes B<EncFS> to run in the foreground.
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Normally B<EncFS> spawns off as a daemon and runs in the background, returning
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control to the spawning shell. With the B<-f> option, it will run in the
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foreground and any warning/debug log messages will be displayed on standard
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error. In the default (background) mode, all log messages are logged via
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syslog.
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=item B<--forcedecode>
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=item B<--annotate>
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This option only has an effect on filesystems which use MAC block headers. By
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default, if a block is decoded and the stored MAC doesn't match what is
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calculated, then an IO error is returned to the application and the block is
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not returned. However, by specifying B<--forcedecode>, only an error will be
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logged and the data will still be returned to the application. This may be
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useful for attempting to read corrupted files.
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Print annotation lines to stderr during configuration.
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=item B<--public>
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=item B<--standard>
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Attempt to make encfs behave as a typical multi-user filesystem. By default,
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all FUSE based filesystems are visible only to the user who mounted them. No
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other users (including root) can view the filesystem contents. The B<--public>
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option does two things. It adds the FUSE flags "allow_other" and
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"default_permission" when mounting the filesystem, which tells FUSE to allow
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other users to access the filesystem, and to use the ownership permissions
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provided by the filesystem. Secondly, the B<--public> flag changes how encfs's
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node creation functions work - as they will try and set ownership of new nodes
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based on the caller identification.
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If creating a new filesystem, this automatically selects standard configuration
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options, to help with automatic filesystem creation. This is the set of
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options that should be used unless you know what you're doing and have read the
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documentation.
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B<Warning>: In order for this to work, encfs must be run as root -- otherwise
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it will not have the ability to change ownership of files. I recommend that
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you instead investigate if the fuse allow_other option can be used to do what
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you want before considering the use of B<--public>.
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When not creating a filesystem, this flag does nothing.
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=item B<--ondemand>
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=item B<--paranoia>
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Mount the filesystem on-demand. This currently only makes sense in combination
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with B<--idle> and B<--extpass> options. When the filesystem becomes idle,
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instead of exiting, B<EncFS> stops allowing access to the filesystem by
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internally dropping its reference to it. If someone attempts to access the
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filesystem again, the extpass program is used to prompt the user for the
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password. If this succeeds, then the filesystem becomes available again.
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=item B<--delaymount>
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Do not mount the filesystem when encfs starts; instead, delay mounting until
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first use. This option only makes sense with B<--ondemand>.
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=item B<--require-macs>
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If creating a new filesystem, this forces block authentication code headers to
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be enabled. When mounting an existing filesystem, this causes encfs to exit
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if block authentication code headers are not enabled.
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This can be used to improve security in case the ciphertext is vulnerable to
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tampering, by preventing an attacker from disabling MACs in the config file.
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Same as B<--standard>, but for B<paranoia> mode.
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=item B<--reverse>
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@ -159,58 +117,6 @@ Now /tmp/plain-view contains the same data as /home/me
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Note that B<--reverse> mode only works with limited configuration options, so
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many settings may be disabled when used.
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=item B<--nocache>
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Disable the kernel's cache of file attributes.
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Setting this option makes EncFS pass "attr_timeout=0" and "entry_timeout=0" to
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FUSE. This makes sure that modifications to the backing files that occour
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outside EncFS show up immediately in the EncFS mount. The main use case
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for "--nocache" is reverse mode.
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=item B<--standard>
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If creating a new filesystem, this automatically selects standard configuration
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options, to help with automatic filesystem creation. This is the set of
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options that should be used unless you know what you're doing and have read the
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documentation.
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When not creating a filesystem, this flag does nothing.
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=item B<-o FUSE_ARG>
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Pass through B<FUSE> args to the underlying library. This makes it easy to
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pass FUSE options when mounting B<EncFS> via mount (and /etc/fstab). Eg:
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mount encfs#/home/me-crypt /home/me -t fuse -o kernel_cache
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Note that encfs arguments cannot be set this way. If you need to set encfs
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arguments, create a wrapper, such as encfs-reverse;
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#!/bin/sh
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encfs --reverse "$@"
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Then mount using the script path
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mount encfs-reverse#/home/me /home/me-crypt -t fuse
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=item B<-->
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The B<--> option tells B<EncFS> to send any remaining arguments directly to
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B<FUSE>. In turn, B<FUSE> passes the arguments to B<fusermount>. See
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the B<fusermount> help page for information on available commands.
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=item B<--no-default-flags>
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B<Encfs> adds the FUSE flags "use_ino" and "default_permissions" by default, as
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of version 1.2.2, because that improves compatibility with some programs. If
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for some reason you need to disable one or both of these flags, use the option
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B<--no-default-flags>.
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The following command lines produce the same result:
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encfs raw crypt
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encfs --no-default-flags raw crypt -- -o use_ino,default_permissions
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=item B<--extpass=program>
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Specify an external program to use for getting the user password. When the
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@ -252,6 +158,118 @@ which will not remain the same if the primary password is changed.
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B<Warning>: Use this option at your own risk.
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=item B<--forcedecode>
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This option only has an effect on filesystems which use MAC block headers. By
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default, if a block is decoded and the stored MAC doesn't match what is
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calculated, then an IO error is returned to the application and the block is
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not returned. However, by specifying B<--forcedecode>, only an error will be
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logged and the data will still be returned to the application. This may be
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useful for attempting to read corrupted files.
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=item B<--require-macs>
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If creating a new filesystem, this forces block authentication code headers to
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be enabled. When mounting an existing filesystem, this causes encfs to exit
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if block authentication code headers are not enabled.
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This can be used to improve security in case the ciphertext is vulnerable to
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tampering, by preventing an attacker from disabling MACs in the config file.
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=item B<-i>, B<--idle=MINUTES>
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Enable automatic unmount of the filesystem after a period of inactivity. The
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period is specified in minutes, so the shortest timeout period that can be
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requested is one minute. B<EncFS> will not automatically unmount if there are
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files open within the filesystem, even if they are open in read-only mode.
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However simply having files open does not count as activity.
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=item B<-m>, B<--ondemand>
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Mount the filesystem on-demand. This currently only makes sense in combination
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with B<--idle> and B<--extpass> options. When the filesystem becomes idle,
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instead of exiting, B<EncFS> stops allowing access to the filesystem by
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internally dropping its reference to it. If someone attempts to access the
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filesystem again, the extpass program is used to prompt the user for the
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password. If this succeeds, then the filesystem becomes available again.
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=item B<--delaymount>
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Do not mount the filesystem when encfs starts; instead, delay mounting until
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first use. This option only makes sense with B<--ondemand>.
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=item B<--public>
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Attempt to make encfs behave as a typical multi-user filesystem. By default,
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all FUSE based filesystems are visible only to the user who mounted them. No
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other users (including root) can view the filesystem contents. The B<--public>
|
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option does two things. It adds the FUSE flags "allow_other" and
|
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"default_permission" when mounting the filesystem, which tells FUSE to allow
|
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other users to access the filesystem, and to use the ownership permissions
|
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provided by the filesystem. Secondly, the B<--public> flag changes how encfs's
|
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node creation functions work - as they will try and set ownership of new nodes
|
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based on the caller identification.
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B<Warning>: In order for this to work, encfs must be run as root -- otherwise
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it will not have the ability to change ownership of files. I recommend that
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you instead investigate if the fuse allow_other option can be used to do what
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you want before considering the use of B<--public>.
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=item B<--nocache>
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Disable the kernel's cache of file attributes.
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Setting this option makes EncFS pass "attr_timeout=0" and "entry_timeout=0" to
|
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FUSE. This makes sure that modifications to the backing files that occour
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outside EncFS show up immediately in the EncFS mount. The main use case
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for "--nocache" is reverse mode.
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=item B<--no-default-flags>
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B<Encfs> adds the FUSE flags "use_ino" and "default_permissions" by default, as
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of version 1.2.2, because that improves compatibility with some programs. If
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for some reason you need to disable one or both of these flags, use the option
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B<--no-default-flags>.
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The following command lines produce the same result:
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encfs raw crypt
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encfs --no-default-flags raw crypt -- -o use_ino,default_permissions
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=item B<-o FUSE_ARG>
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Pass through B<FUSE> args to the underlying library. This makes it easy to
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pass FUSE options when mounting B<EncFS> via mount (and /etc/fstab). Eg:
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mount encfs#/home/me-crypt /home/me -t fuse -o kernel_cache
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Note that encfs arguments cannot be set this way. If you need to set encfs
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arguments, create a wrapper, such as encfs-reverse;
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#!/bin/sh
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encfs --reverse "$@"
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Then mount using the script path
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mount encfs-reverse#/home/me /home/me-crypt -t fuse
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=item B<-d>, B<--fuse-debug>
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Enables debugging within the B<FUSE> library. This should only be used if you
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suspect a problem within B<FUSE> itself (not B<EncFS>), as it generates a lot
|
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of low-level data and is not likely to be very helpful in general problem
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tracking. Try I<verbose> mode (B<-v>) first, which gives a higher level view
|
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of what is happening within B<EncFS>.
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=item B<-H>, B<--fuse-help>
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Shows B<FUSE> help.
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=item B<-->
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The B<--> option tells B<EncFS> to send any remaining arguments directly to
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B<FUSE>. In turn, B<FUSE> passes the arguments to B<fusermount>. See
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the B<fusermount> help page for information on available commands.
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=back
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=head1 ENVIRONMENT VARIABLES
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