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authorJan Janssen <medhefgo@web.de>2013-07-13 13:19:38 +0200
committerLennart Poettering <lennart@poettering.net>2013-07-16 01:24:31 +0200
commit8cf3ca80680b43015971cbbf4625517ae859d50c (patch)
tree7aab079ad51cd413f9207e0b9a0cabd1e53f6074 /src
parent10fb4e35fd8a44340f695e49230dc61b5766d47a (diff)
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.
Diffstat (limited to 'src')
-rw-r--r--src/cryptsetup/cryptsetup.c79
1 files changed, 75 insertions, 4 deletions
diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c
index e84ebba683..3a2cfe459b 100644
--- a/src/cryptsetup/cryptsetup.c
+++ b/src/cryptsetup/cryptsetup.c
@@ -27,6 +27,7 @@
#include <libcryptsetup.h>
#include <libudev.h>
+#include "fileio.h"
#include "log.h"
#include "util.h"
#include "path-util.h"
@@ -34,7 +35,7 @@
#include "ask-password-api.h"
#include "def.h"
-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, &params);
+ 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;
}