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cryptsetup: Add tcrypt support
Tcrypt uses a different approach to passphrases/key files. The passphrase and all key files are incorporated into the "password" to open the volume. So, the idea of slots that provide a way to open the volume with different passphrases/key files that are independent from each other like with LUKS does not apply. Therefore, we use the key file from /etc/crypttab as the source for the passphrase. The actual key files that are combined with the passphrase into a password are provided as a new option in /etc/crypttab and can be given multiple times if more than one key file is used by a volume.
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@ -576,7 +576,7 @@ AC_SUBST(AUDIT_LIBS)
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have_libcryptsetup=no
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AC_ARG_ENABLE(libcryptsetup, AS_HELP_STRING([--disable-libcryptsetup], [disable libcryptsetup tools]))
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if test "x$enable_libcryptsetup" != "xno"; then
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PKG_CHECK_MODULES(LIBCRYPTSETUP, [ libcryptsetup >= 1.4.2 ],
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PKG_CHECK_MODULES(LIBCRYPTSETUP, [ libcryptsetup >= 1.6.0 ],
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[AC_DEFINE(HAVE_LIBCRYPTSETUP, 1, [Define if libcryptsetup is available]) have_libcryptsetup=yes], have_libcryptsetup=no)
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if test "x$have_libcryptsetup" = xno -a "x$enable_libcryptsetup" = xyes; then
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AC_MSG_ERROR([*** libcryptsetup support requested but libraries not found])
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350
man/crypttab.xml
350
man/crypttab.xml
@ -75,23 +75,29 @@
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fields are mandatory, the remaining two are
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optional.</para>
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<para>Setting up encrypted block devices using this file
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supports three encryption modes: LUKS, TrueCrypt and plain.
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See <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for more information about each mode. When no mode is specified
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in the options field and the block device contains a LUKS
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signature, it is opened as a LUKS device; otherwise, it is
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assumed to be in raw dm-crypt (plain mode) format.</para>
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<para>The first field contains the name of the
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resulting encrypted block device; the device is set up
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within <filename>/dev/mapper/</filename>.</para>
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<para>The second field contains a path to the
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underlying block device, or a specification of a block
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underlying block device or file, or a specification of a block
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device via <literal>UUID=</literal> followed by the
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UUID. If the block device contains a LUKS signature,
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it is opened as a LUKS encrypted partition; otherwise,
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it is assumed to be a raw dm-crypt partition.</para>
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UUID.</para>
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<para>The third field specifies the encryption
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password. If the field is not present or the password
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is set to none, the password has to be manually
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entered during system boot. Otherwise, the field is
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interpreted as a path to a file containing the
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encryption password. For swap encryption,
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is set to <literal>none</literal> or <literal>-</literal>,
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the password has to be manually entered during system boot.
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Otherwise, the field is interpreted as a absolute path to
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a file containing the encryption password. For swap encryption,
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<filename>/dev/urandom</filename> or the hardware
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device <filename>/dev/hw_random</filename> can be used
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as the password file; using
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@ -104,181 +110,237 @@
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options are recognized:</para>
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<variablelist class='crypttab-options'>
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<varlistentry>
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<term><varname>allow-discards</varname></term>
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<listitem><para>Allow discard requests to be
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passed through the encrypted block device. This
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improves performance on SSD storage but has
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security implications.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>cipher=</varname></term>
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<listitem><para>Specifies the cipher
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to use; see
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<listitem><para>Specifies the cipher to use. See
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for possible values and the default
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value of this option. A cipher with
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unpredictable IV values, such as
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<literal>aes-cbc-essiv:sha256</literal>,
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is recommended. </para></listitem>
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for possible values and the default value of
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this option. A cipher with unpredictable IV
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values, such as <literal>aes-cbc-essiv:sha256</literal>,
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is recommended.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>size=</varname></term>
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<term><varname>hash=</varname></term>
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<listitem><para>Specifies the key size
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in bits; see
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<listitem><para>Specifies the hash to use for
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password hashing. See
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for possible values and the default
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value of this
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option. </para></listitem>
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for possible values and the default value of
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this option.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>keyfile-offset=</varname></term>
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<listitem><para>Specifies the number of bytes to
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skip at the start of the key file. See
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for possible values and the default value of
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this option.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>keyfile-size=</varname></term>
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<listitem><para>Specifies the maximum number
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of bytes to read from the keyfile; see
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of bytes to read from the key file. See
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for possible values and the default
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value of this option. This option is ignored
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in plain encryption mode, as the keyfile-size is then given by the key size.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>keyfile-offset=</varname></term>
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<listitem><para>Specifies the number
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of bytes to skip at the start of
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the keyfile; see
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for possible values and the default
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value of this option.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>hash=</varname></term>
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<listitem><para>Specifies the hash to
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use for password hashing; see
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry> for possible values and
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the default value of this
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option. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>tries=</varname></term>
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<listitem><para>Specifies the maximum
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number of times the user is queried
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for a password.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>verify</varname></term>
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<listitem><para> If the encryption
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password is read from console, it has
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to be entered twice (to prevent
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typos). </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>read-only</varname></term><term><varname>readonly</varname></term>
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<listitem><para>Set up the encrypted
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block device in read-only
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mode.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>allow-discards</varname></term>
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<listitem><para>Allow discard requests
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to be passed through the encrypted
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block device. This improves
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performance on SSD storage but has
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security
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implications.</para></listitem>
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for possible values and the default value of
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this option. This option is ignored in plain
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encryption mode, as the key file size is then
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given by the key size.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>luks</varname></term>
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<listitem><para>Force LUKS mode.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>plain</varname></term>
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<listitem><para>Force plain encryption
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mode.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>timeout=</varname></term>
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<listitem><para>Specify the timeout
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for querying for a password. If no
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unit is specified seconds is used.
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Supported units are s, ms, us, min, h,
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d. A timeout of 0 waits indefinitely
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(which is the
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default).</para></listitem>
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<listitem><para>Force LUKS mode. When this mode
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is used the following options are ignored since
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they are provided by the LUKS header on the
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device: <varname>cipher=</varname>,
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<varname>hash=</varname>,
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<varname>size=</varname>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>noauto</varname></term>
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<listitem><para> This device will not
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be automatically unlocked on
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boot. </para></listitem>
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<listitem><para>This device will not be
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automatically unlocked on boot.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>nofail</varname></term>
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<listitem><para>The system will not
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wait for the device to show up and be
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unlocked at boot, and not fail the
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boot if it does not show
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up.</para></listitem>
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<listitem><para>The system will not wait for the
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device to show up and be unlocked at boot, and
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not fail the boot if it does not show up.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>plain</varname></term>
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<listitem><para>Force plain encryption mode.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>read-only</varname></term><term><varname>readonly</varname></term>
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<listitem><para>Set up the encrypted block
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device in read-only mode.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>size=</varname></term>
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<listitem><para>Specifies the key size
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in bits. See
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for possible values and the default value of
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this option.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>swap</varname></term>
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<listitem><para> The encrypted block
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device will be used as a swap
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partition, and will be formatted as a
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swap partition after setting up the
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encrypted block device, with
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<citerefentry><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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<listitem><para>The encrypted block device will
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be used as a swap device, and will be formatted
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accordingly after setting up the encrypted
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block device, with
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<citerefentry><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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This option implies <varname>plain</varname>.</para>
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<para>WARNING: Using the
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<varname>swap</varname> option will
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destroy the contents of the named
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partition during every boot, so make
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sure the underlying block device is
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specified
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correctly. </para></listitem>
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<para>WARNING: Using the <varname>swap</varname>
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option will destroy the contents of the named
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partition during every boot, so make sure the
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underlying block device is specified correctly.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>tcrypt</varname></term>
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<listitem><para>Use TrueCrypt encryption mode.
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When this mode is used the following options are
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ignored since they are provided by the TrueCrypt
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header on the device or do not apply:
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<varname>cipher=</varname>,
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<varname>hash=</varname>,
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<varname>keyfile-offset=</varname>,
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<varname>keyfile-size=</varname>,
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<varname>size=</varname>.</para>
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<para>When this mode is used, the passphrase is
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read from the key file given in the third field.
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Only the first line of this file is read,
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excluding the new line character.</para>
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<para>Note that the TrueCrypt format uses both
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passphrase and key files to derive a password
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for the volume. Therefore, the passphrase and
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all key files need to be provided. Use
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<varname>tcrypt-keyfile=</varname> to provide
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the absolute path to all key files. When using
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an empty passphrase in combination with one or
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more key files, use <literal>/dev/null</literal>
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as the password file in the third field.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>tcrypt-hidden</varname></term>
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<listitem><para>Use the hidden TrueCrypt volume.
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This implies <varname>tcrypt</varname>.</para>
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<para>This will map the hidden volume that is
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inside of the volume provided in the second
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field. Please note that there is no protection
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for the hidden volume if the outer volume is
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mounted instead. See
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for more information on this limitation.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>tcrypt-keyfile=</varname></term>
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<listitem><para>Specifies the absolute path to a
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key file to use for a TrueCrypt volume. This
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implies <varname>tcrypt</varname> and can be
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used more than once to provide several key
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files.</para>
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<para>See the entry for <varname>tcrypt</varname>
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on the behavior of the passphrase and key files
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when using TrueCrypt encryption mode.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>tcrypt-system</varname></term>
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<listitem><para>Use TrueCrypt in system
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encryption mode. This implies
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<varname>tcrypt</varname>.</para>
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<para>Please note that when using this mode, the
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whole device needs to be given in the second
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field instead of the partition. For example: if
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<literal>/dev/sda2</literal> is the system
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encrypted TrueCrypt patition, <literal>/dev/sda</literal>
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has to be given.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>timeout=</varname></term>
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<listitem><para>Specifies the timeout for
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querying for a password. If no unit is
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specified, seconds is used. Supported units are
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s, ms, us, min, h, d. A timeout of 0 waits
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indefinitely (which is the default).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>tmp</varname></term>
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<listitem><para>The encrypted block
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device will be prepared for using it
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as <filename>/tmp</filename>
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partition: it will be formatted using
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<citerefentry><refentrytitle>mke2fs</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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<listitem><para>The encrypted block device will
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be prepared for using it as <filename>/tmp</filename>;
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it will be formatted using
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<citerefentry><refentrytitle>mke2fs</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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This option implies <varname>plain</varname>.</para>
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<para>WARNING: Using the
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<varname>tmp</varname> option will
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destroy the contents of the named
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partition during every boot, so make
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sure the underlying block device is
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specified
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correctly. </para></listitem>
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<para>WARNING: Using the <varname>tmp</varname>
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option will destroy the contents of the named
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partition during every boot, so make sure the
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underlying block device is specified correctly.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>tries=</varname></term>
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<listitem><para>Specifies the maximum number of
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times the user is queried for a password.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>verify</varname></term>
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<listitem><para> If the encryption password is
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read from console, it has to be entered twice to
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prevent typos.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>At early boot and when the system manager
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@ -291,12 +353,14 @@
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<title>Example</title>
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<example>
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<title>/etc/crypttab example</title>
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<para>Set up two encrypted block devices with
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LUKS: one normal one for storage, and another
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one for usage as swap device.</para>
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<para>Set up four encrypted block devices. One using
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LUKS for normal storage, another one for usage as a swap
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device and two TrueCrypt volumes.</para>
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<programlisting>luks-2505567a-9e27-4efe-a4d5-15ad146c258b UUID=2505567a-9e27-4efe-a4d5-15ad146c258b - timeout=0
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swap /dev/sda7 /dev/urandom swap</programlisting>
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<programlisting>luks UUID=2505567a-9e27-4efe-a4d5-15ad146c258b
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swap /dev/sda7 /dev/urandom swap
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truecrypt /dev/sda2 /etc/container_password tcrypt
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hidden /mnt/tc_hidden /null tcrypt-hidden,tcrypt-keyfile=/etc/keyfile</programlisting>
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</example>
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</refsect1>
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@ -27,6 +27,7 @@
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#include <libcryptsetup.h>
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#include <libudev.h>
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#include "fileio.h"
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#include "log.h"
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#include "util.h"
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#include "path-util.h"
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@ -34,7 +35,7 @@
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#include "ask-password-api.h"
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#include "def.h"
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static const char *opt_type = NULL; /* LUKS1 or PLAIN */
|
||||
static const char *opt_type = NULL; /* CRYPT_LUKS1, CRYPT_TCRYPT or CRYPT_PLAIN */
|
||||
static char *opt_cipher = NULL;
|
||||
static unsigned opt_key_size = 0;
|
||||
static unsigned opt_keyfile_size = 0;
|
||||
@ -44,6 +45,9 @@ static unsigned opt_tries = 0;
|
||||
static bool opt_readonly = false;
|
||||
static bool opt_verify = false;
|
||||
static bool opt_discards = false;
|
||||
static bool opt_tcrypt_hidden = false;
|
||||
static bool opt_tcrypt_system = false;
|
||||
static char **opt_tcrypt_keyfiles = NULL;
|
||||
static usec_t opt_timeout = 0;
|
||||
|
||||
/* Options Debian's crypttab knows we don't:
|
||||
@ -82,6 +86,14 @@ static int parse_one_option(const char *option) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
} else if (startswith(option, "tcrypt-keyfile=")) {
|
||||
|
||||
opt_type = CRYPT_TCRYPT;
|
||||
if (path_is_absolute(option+15))
|
||||
opt_tcrypt_keyfiles = strv_append(opt_tcrypt_keyfiles, strdup(option+15));
|
||||
else
|
||||
log_error("Key file path '%s' is not absolute. Ignoring.", option+15);
|
||||
|
||||
} else if (startswith(option, "keyfile-size=")) {
|
||||
|
||||
if (safe_atou(option+13, &opt_keyfile_size) < 0) {
|
||||
@ -121,7 +133,15 @@ static int parse_one_option(const char *option) {
|
||||
opt_discards = true;
|
||||
else if (streq(option, "luks"))
|
||||
opt_type = CRYPT_LUKS1;
|
||||
else if (streq(option, "plain") ||
|
||||
else if (streq(option, "tcrypt"))
|
||||
opt_type = CRYPT_TCRYPT;
|
||||
else if (streq(option, "tcrypt-hidden")) {
|
||||
opt_type = CRYPT_TCRYPT;
|
||||
opt_tcrypt_hidden = true;
|
||||
} else if (streq(option, "tcrypt-system")) {
|
||||
opt_type = CRYPT_TCRYPT;
|
||||
opt_tcrypt_system = true;
|
||||
} else if (streq(option, "plain") ||
|
||||
streq(option, "swap") ||
|
||||
streq(option, "tmp"))
|
||||
opt_type = CRYPT_PLAIN;
|
||||
@ -301,6 +321,53 @@ static int get_password(const char *name, usec_t until, bool accept_cached, char
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int attach_tcrypt(struct crypt_device *cd,
|
||||
const char *name,
|
||||
const char *key_file,
|
||||
char **passwords,
|
||||
uint32_t flags) {
|
||||
int r = 0;
|
||||
_cleanup_free_ char *passphrase = NULL;
|
||||
struct crypt_params_tcrypt params = {
|
||||
.flags = CRYPT_TCRYPT_LEGACY_MODES,
|
||||
.keyfiles = (const char **)opt_tcrypt_keyfiles,
|
||||
.keyfiles_count = strv_length(opt_tcrypt_keyfiles)
|
||||
};
|
||||
|
||||
assert(cd);
|
||||
assert(name);
|
||||
assert(key_file || passwords);
|
||||
|
||||
if (opt_tcrypt_hidden)
|
||||
params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER;
|
||||
|
||||
if (opt_tcrypt_system)
|
||||
params.flags |= CRYPT_TCRYPT_SYSTEM_HEADER;
|
||||
|
||||
if (key_file) {
|
||||
r = read_one_line_file(key_file, &passphrase);
|
||||
if (r < 0) {
|
||||
log_error("Failed to read password file '%s': %s", key_file, strerror(-r));
|
||||
return -EAGAIN;
|
||||
}
|
||||
|
||||
params.passphrase = passphrase;
|
||||
} else
|
||||
params.passphrase = passwords[0];
|
||||
params.passphrase_size = strlen(params.passphrase);
|
||||
|
||||
r = crypt_load(cd, CRYPT_TCRYPT, ¶ms);
|
||||
if (r < 0) {
|
||||
if (key_file && r == -EPERM) {
|
||||
log_error("Failed to activate using password file '%s'.", key_file);
|
||||
return -EAGAIN;
|
||||
}
|
||||
return r;
|
||||
}
|
||||
|
||||
return crypt_activate_by_volume_key(cd, name, NULL, 0, flags);;
|
||||
}
|
||||
|
||||
static int attach_luks_or_plain(struct crypt_device *cd,
|
||||
const char *name,
|
||||
const char *key_file,
|
||||
@ -450,7 +517,7 @@ int main(int argc, char *argv[]) {
|
||||
!streq(argv[4], "none")) {
|
||||
|
||||
if (!path_is_absolute(argv[4]))
|
||||
log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
|
||||
log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]);
|
||||
else
|
||||
key_file = argv[4];
|
||||
}
|
||||
@ -532,7 +599,10 @@ int main(int argc, char *argv[]) {
|
||||
goto finish;
|
||||
}
|
||||
|
||||
k = attach_luks_or_plain(cd, argv[2], key_file, passwords, flags);
|
||||
if (streq_ptr(opt_type, CRYPT_TCRYPT))
|
||||
k = attach_tcrypt(cd, argv[2], key_file, passwords, flags);
|
||||
else
|
||||
k = attach_luks_or_plain(cd, argv[2], key_file, passwords, flags);
|
||||
if (k >= 0)
|
||||
break;
|
||||
else if (k == -EAGAIN) {
|
||||
@ -583,6 +653,7 @@ finish:
|
||||
|
||||
free(opt_cipher);
|
||||
free(opt_hash);
|
||||
strv_free(opt_tcrypt_keyfiles);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user