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Implement VeraCrypt volume handling in crypttab (#4501)

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This introduces a new option, `tcrypt-veracrypt`, that sets the
corresponding VeraCrypt flag in the flags passed to cryptsetup.
This commit is contained in:
George Hilliard 2016-10-30 09:25:31 -05:00 committed by Zbigniew Jędrzejewski-Szmek
parent 0470289b6e
commit 52028838a1
2 changed files with 25 additions and 0 deletions
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11
man/crypttab.xml
View File

@ -326,6 +326,17 @@
option implies <option>tcrypt</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>tcrypt-veracrypt</option></term>
<listitem><para>Check for a VeraCrypt volume. VeraCrypt is a fork of
TrueCrypt that is mostly compatible, but uses different, stronger key
derivation algorithms that cannot be detected without this flag.
Enabling this option could substantially slow down unlocking, because
VeraCrypt's key derivation takes much longer than TrueCrypt's. This
option implies <option>tcrypt</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>timeout=</option></term>

14
src/cryptsetup/cryptsetup.c
View File

@ -52,6 +52,7 @@ static bool arg_verify = false;
static bool arg_discards = false;
static bool arg_tcrypt_hidden = false;
static bool arg_tcrypt_system = false;
static bool arg_tcrypt_veracrypt = false;
static char **arg_tcrypt_keyfiles = NULL;
static uint64_t arg_offset = 0;
static uint64_t arg_skip = 0;
@ -179,6 +180,14 @@ static int parse_one_option(const char *option) {
} else if (streq(option, "tcrypt-system")) {
arg_type = CRYPT_TCRYPT;
arg_tcrypt_system = true;
} else if (streq(option, "tcrypt-veracrypt")) {
#ifdef CRYPT_TCRYPT_VERA_MODES
arg_type = CRYPT_TCRYPT;
arg_tcrypt_veracrypt = true;
#else
log_error("This version of cryptsetup does not support tcrypt-veracrypt; refusing.");
return -EINVAL;
#endif
} else if (STR_IN_SET(option, "plain", "swap", "tmp"))
arg_type = CRYPT_PLAIN;
else if (startswith(option, "timeout=")) {
@ -441,6 +450,11 @@ static int attach_tcrypt(
if (arg_tcrypt_system)
params.flags |= CRYPT_TCRYPT_SYSTEM_HEADER;
#ifdef CRYPT_TCRYPT_VERA_MODES
if (arg_tcrypt_veracrypt)
params.flags |= CRYPT_TCRYPT_VERA_MODES;
#endif
if (key_file) {
r = read_one_line_file(key_file, &passphrase);
if (r < 0) {