mirror of
https://gitee.com/openharmony/third_party_f2fs-tools
synced 2024-11-27 04:00:57 +00:00
7f00dd441c
It's migrated from e4crypt.
Adds an example to the f2fscrypt manpages.
v3, add /tools/f2fscrypt to .gitignore
v2, migrate those micro defines for encrypt to f2fs internal,
drop unless of libsha etc.
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
103 lines
3.1 KiB
Groff
103 lines
3.1 KiB
Groff
.TH F2FSCRYPT 8
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.SH NAME
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f2fscrypt \- f2fs filesystem encryption utility
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.SH SYNOPSIS
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.B f2fscrypt add_key -S \fR[\fB -k \fIkeyring\fR ] [\fB-v\fR] [\fB-q\fR] [ \fI path\fR ... ]
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.br
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.B f2fscrypt new_session
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.br
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.B f2fscrypt get_policy \fIpath\fR ...
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.br
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.B f2fscrypt set_policy \fIpolicy path\fR ...
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.SH DESCRIPTION
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.B f2fscrypt
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performs encryption management for f2fs file systems.
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.SH COMMANDS
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.TP
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.B f2fscrypt add_key -S \fR[\fB -k \fIkeyring\fR ] [\fB-v\fR] [\fB-q\fR] [ \fI path\fR ... ]
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Prompts the user for a passphrase and inserts it into the specified
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keyring. If no keyring is specified, f2fscrypt will use the session
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keyring if it exists or the user session keyring if it does not.
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.IP
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If one or more directory paths are specified, f2fscrypt will try to
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set the policy of those directories to use the key just entered by
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the user.
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.TP
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.B f2fscrypt get_policy \fIpath\fR ...
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Print the policy for the directories specified on the command line.
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.TP
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.B f2fscrypt new_session
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Give the invoking process (typically a shell) a new session keyring,
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discarding its old session keyring.
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.TP
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.B f2fscrypt set_policy \fIpolicy path\fR ...
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Sets the policy for the directories specified on the command line.
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All directories must be empty to set the policy; if the directory
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already has a policy established, f2fscrypt will validate that the
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policy matches what was specified. A policy is an encryption key
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identifier consisting of 16 hexadecimal characters.
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.SH NOTES
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The target directory must be empty.
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.SH EXAMPLE
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.nf
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Formats a f2fs filesytem that supports encrypt.
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.ft R
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# mkfs.f2fs -O encrypt /dev/sdxx
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# mount /dev/sdxx /encrypted/
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# mkdir /encrypted/dir
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.nf
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First create the key in the keyring use an simple salt
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(or generate a random salt).
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Then use it to set the policy for the directory to be encrypted.
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.ft R
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# f2fscrypt add_key -S 0x1234
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Enter passphrase (echo disabled):
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Added key with descriptor [28e21cc0c4393da1]
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# f2fscrypt set_policy 28e21cc0c4393da1 /encrypted/dir
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Key with descriptor [28e21cc0c4393da1] applied to /encrypted/dir.
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# touch /encrypted/dir/test.txt
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# ls -l /encrypted/dir/
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-rw-r--r--. 1 root root 0 Mar 5 21:41 test.txt
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.nf
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After each reboot, the same command can be used set the key for
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decryption of the directory and its descendants.
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.ft R
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# ls -l /encrypted/dir/
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-rw-r--r--. 1 root root 0 Mar 5 21:41 zbx7tsUEMLzh+AUVMkQcnB
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# f2fscrypt get_policy /encrypted/dir/
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/encrypted/dir/: 28e21cc0c4393da1
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# f2fscrypt add_key -S 0x1234
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Enter passphrase (echo disabled):
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Added key with descriptor [28e21cc0c4393da1]
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# ls -l /encrypted/dir/
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-rw-r--r--. 1 root root 0 Mar 5 21:41 test.txt
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.nf
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Show process keyrings.
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.ft R
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# keyctl show
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Session Keyring
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84022412 --alswrv 0 0 keyring: _ses
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204615789 --alswrv 0 65534 \\_ keyring: _uid.0
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529474961 --alsw-v 0 0 \\_ logon: f2fs:28e21cc0c4393da1
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.SH AUTHOR
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Written by Kinglong Mee <kinglongmee@gmail.com>,
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Migrated from e4crypt that Written by Michael Halcrow <mhalcrow@google.com>,
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Ildar Muslukhov <muslukhovi@gmail.com>, and Theodore Ts'o <tytso@mit.edu>
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.SH SEE ALSO
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.BR keyctl (1),
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.BR mkfs.f2fs (8),
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.BR mount (8).
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