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-rw-r--r--src/cryptsetup/cryptsetup.c529
1 files changed, 529 insertions, 0 deletions
diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c
new file mode 100644
index 0000000000..ac7b6d6c38
--- /dev/null
+++ b/src/cryptsetup/cryptsetup.c
@@ -0,0 +1,529 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <string.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include <mntent.h>
+
+#include <libcryptsetup.h>
+#include <libudev.h>
+
+#include "log.h"
+#include "util.h"
+#include "strv.h"
+#include "ask-password-api.h"
+#include "def.h"
+
+static const char *opt_type = NULL; /* LUKS1 or PLAIN */
+static char *opt_cipher = NULL;
+static unsigned opt_key_size = 0;
+static char *opt_hash = NULL;
+static unsigned opt_tries = 0;
+static bool opt_readonly = false;
+static bool opt_verify = false;
+static usec_t opt_timeout = DEFAULT_TIMEOUT_USEC;
+
+/* Options Debian's crypttab knows we don't:
+
+ offset=
+ skip=
+ precheck=
+ check=
+ checkargs=
+ noearly=
+ loud=
+ keyscript=
+*/
+
+static int parse_one_option(const char *option) {
+ assert(option);
+
+ /* Handled outside of this tool */
+ if (streq(option, "noauto"))
+ return 0;
+
+ if (startswith(option, "cipher=")) {
+ char *t;
+
+ if (!(t = strdup(option+7)))
+ return -ENOMEM;
+
+ free(opt_cipher);
+ opt_cipher = t;
+
+ } else if (startswith(option, "size=")) {
+
+ if (safe_atou(option+5, &opt_key_size) < 0) {
+ log_error("size= parse failure, ignoring.");
+ return 0;
+ }
+
+ } else if (startswith(option, "hash=")) {
+ char *t;
+
+ if (!(t = strdup(option+5)))
+ return -ENOMEM;
+
+ free(opt_hash);
+ opt_hash = t;
+
+ } else if (startswith(option, "tries=")) {
+
+ if (safe_atou(option+6, &opt_tries) < 0) {
+ log_error("tries= parse failure, ignoring.");
+ return 0;
+ }
+
+ } else if (streq(option, "readonly"))
+ opt_readonly = true;
+ else if (streq(option, "verify"))
+ opt_verify = true;
+ else if (streq(option, "luks"))
+ opt_type = CRYPT_LUKS1;
+ else if (streq(option, "plain") ||
+ streq(option, "swap") ||
+ streq(option, "tmp"))
+ opt_type = CRYPT_PLAIN;
+ else if (startswith(option, "timeout=")) {
+
+ if (parse_usec(option+8, &opt_timeout) < 0) {
+ log_error("timeout= parse failure, ignoring.");
+ return 0;
+ }
+
+ } else if (!streq(option, "none"))
+ log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
+
+ return 0;
+}
+
+static int parse_options(const char *options) {
+ char *state;
+ char *w;
+ size_t l;
+
+ assert(options);
+
+ FOREACH_WORD_SEPARATOR(w, l, options, ",", state) {
+ char *o;
+ int r;
+
+ if (!(o = strndup(w, l)))
+ return -ENOMEM;
+
+ r = parse_one_option(o);
+ free(o);
+
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static void log_glue(int level, const char *msg, void *usrptr) {
+ log_debug("%s", msg);
+}
+
+static char *disk_description(const char *path) {
+ struct udev *udev = NULL;
+ struct udev_device *device = NULL;
+ struct stat st;
+ char *description = NULL;
+ const char *model;
+
+ assert(path);
+
+ if (stat(path, &st) < 0)
+ return NULL;
+
+ if (!S_ISBLK(st.st_mode))
+ return NULL;
+
+ if (!(udev = udev_new()))
+ return NULL;
+
+ if (!(device = udev_device_new_from_devnum(udev, 'b', st.st_rdev)))
+ goto finish;
+
+ if ((model = udev_device_get_property_value(device, "ID_MODEL_FROM_DATABASE")) ||
+ (model = udev_device_get_property_value(device, "ID_MODEL")) ||
+ (model = udev_device_get_property_value(device, "DM_NAME")))
+ description = strdup(model);
+
+finish:
+ if (device)
+ udev_device_unref(device);
+
+ if (udev)
+ udev_unref(udev);
+
+ return description;
+}
+
+static char *disk_mount_point(const char *label) {
+ char *mp = NULL, *device = NULL;
+ FILE *f = NULL;
+ struct mntent *m;
+
+ /* Yeah, we don't support native systemd unit files here for now */
+
+ if (asprintf(&device, "/dev/mapper/%s", label) < 0)
+ goto finish;
+
+ if (!(f = setmntent("/etc/fstab", "r")))
+ goto finish;
+
+ while ((m = getmntent(f)))
+ if (path_equal(m->mnt_fsname, device)) {
+ mp = strdup(m->mnt_dir);
+ break;
+ }
+
+finish:
+ if (f)
+ endmntent(f);
+
+ free(device);
+
+ return mp;
+}
+
+static int help(void) {
+
+ printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
+ "%s detach VOLUME\n\n"
+ "Attaches or detaches an encrypted block device.\n",
+ program_invocation_short_name,
+ program_invocation_short_name);
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ int r = EXIT_FAILURE;
+ struct crypt_device *cd = NULL;
+ char **passwords = NULL, *truncated_cipher = NULL;
+ const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL, *name = NULL;
+ char *description = NULL, *name_buffer = NULL, *mount_point = NULL;
+ unsigned keyfile_size = 0;
+
+ if (argc <= 1) {
+ help();
+ return EXIT_SUCCESS;
+ }
+
+ if (argc < 3) {
+ log_error("This program requires at least two arguments.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ if (streq(argv[1], "attach")) {
+ uint32_t flags = 0;
+ int k;
+ unsigned try;
+ const char *key_file = NULL;
+ usec_t until;
+ crypt_status_info status;
+
+ /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
+
+ if (argc < 4) {
+ log_error("attach requires at least two arguments.");
+ goto finish;
+ }
+
+ if (argc >= 5 &&
+ argv[4][0] &&
+ !streq(argv[4], "-") &&
+ !streq(argv[4], "none")) {
+
+ if (!path_is_absolute(argv[4]))
+ log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
+ else
+ key_file = argv[4];
+ }
+
+ if (argc >= 6 && argv[5][0] && !streq(argv[5], "-"))
+ parse_options(argv[5]);
+
+ /* A delicious drop of snake oil */
+ mlockall(MCL_FUTURE);
+
+ description = disk_description(argv[3]);
+ mount_point = disk_mount_point(argv[2]);
+
+ if (description && streq(argv[2], description)) {
+ /* If the description string is simply the
+ * volume name, then let's not show this
+ * twice */
+ free(description);
+ description = NULL;
+ }
+
+ if (mount_point && description)
+ asprintf(&name_buffer, "%s (%s) on %s", description, argv[2], mount_point);
+ else if (mount_point)
+ asprintf(&name_buffer, "%s on %s", argv[2], mount_point);
+ else if (description)
+ asprintf(&name_buffer, "%s (%s)", description, argv[2]);
+
+ name = name_buffer ? name_buffer : argv[2];
+
+ if ((k = crypt_init(&cd, argv[3]))) {
+ log_error("crypt_init() failed: %s", strerror(-k));
+ goto finish;
+ }
+
+ crypt_set_log_callback(cd, log_glue, NULL);
+
+ status = crypt_status(cd, argv[2]);
+ if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) {
+ log_info("Volume %s already active.", argv[2]);
+ r = EXIT_SUCCESS;
+ goto finish;
+ }
+
+ if (opt_readonly)
+ flags |= CRYPT_ACTIVATE_READONLY;
+
+ if (opt_timeout > 0)
+ until = now(CLOCK_MONOTONIC) + opt_timeout;
+ else
+ until = 0;
+
+ opt_tries = opt_tries > 0 ? opt_tries : 3;
+ opt_key_size = (opt_key_size > 0 ? opt_key_size : 256);
+ hash = opt_hash ? opt_hash : "ripemd160";
+
+ if (opt_cipher) {
+ size_t l;
+
+ l = strcspn(opt_cipher, "-");
+
+ if (!(truncated_cipher = strndup(opt_cipher, l))) {
+ log_error("Out of memory");
+ goto finish;
+ }
+
+ cipher = truncated_cipher;
+ cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain";
+ } else {
+ cipher = "aes";
+ cipher_mode = "cbc-essiv:sha256";
+ }
+
+ for (try = 0; try < opt_tries; try++) {
+ bool pass_volume_key = false;
+
+ strv_free(passwords);
+ passwords = NULL;
+
+ if (!key_file) {
+ char *text;
+ char **p;
+
+ if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) {
+ log_error("Out of memory");
+ goto finish;
+ }
+
+ k = ask_password_auto(text, "drive-harddisk", until, try == 0 && !opt_verify, &passwords);
+ free(text);
+
+ if (k < 0) {
+ log_error("Failed to query password: %s", strerror(-k));
+ goto finish;
+ }
+
+ if (opt_verify) {
+ char **passwords2 = NULL;
+
+ assert(strv_length(passwords) == 1);
+
+ if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) {
+ log_error("Out of memory");
+ goto finish;
+ }
+
+ k = ask_password_auto(text, "drive-harddisk", until, false, &passwords2);
+ free(text);
+
+ if (k < 0) {
+ log_error("Failed to query verification password: %s", strerror(-k));
+ goto finish;
+ }
+
+ assert(strv_length(passwords2) == 1);
+
+ if (!streq(passwords[0], passwords2[0])) {
+ log_warning("Passwords did not match, retrying.");
+ strv_free(passwords2);
+ continue;
+ }
+
+ strv_free(passwords2);
+ }
+
+ strv_uniq(passwords);
+
+ STRV_FOREACH(p, passwords) {
+ char *c;
+
+ if (strlen(*p)+1 >= opt_key_size)
+ continue;
+
+ /* Pad password if necessary */
+ if (!(c = new(char, opt_key_size))) {
+ log_error("Out of memory.");
+ goto finish;
+ }
+
+ strncpy(c, *p, opt_key_size);
+ free(*p);
+ *p = c;
+ }
+ }
+
+ k = 0;
+
+ if (!opt_type || streq(opt_type, CRYPT_LUKS1))
+ k = crypt_load(cd, CRYPT_LUKS1, NULL);
+
+ if ((!opt_type && k < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) {
+ struct crypt_params_plain params;
+
+ zero(params);
+ params.hash = hash;
+
+ /* In contrast to what the name
+ * crypt_setup() might suggest this
+ * doesn't actually format anything,
+ * it just configures encryption
+ * parameters when used for plain
+ * mode. */
+ k = crypt_format(cd, CRYPT_PLAIN,
+ cipher,
+ cipher_mode,
+ NULL,
+ NULL,
+ opt_key_size / 8,
+ &params);
+
+ pass_volume_key = streq(hash, "plain");
+
+ /* for CRYPT_PLAIN limit reads
+ * from keyfile to key length */
+ keyfile_size = opt_key_size / 8;
+ }
+
+ if (k < 0) {
+ log_error("Loading of cryptographic parameters failed: %s", strerror(-k));
+ goto finish;
+ }
+
+ log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
+ crypt_get_cipher(cd),
+ crypt_get_cipher_mode(cd),
+ crypt_get_volume_key_size(cd)*8,
+ argv[3]);
+
+ if (key_file)
+ k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, keyfile_size, flags);
+ else {
+ char **p;
+
+ STRV_FOREACH(p, passwords) {
+
+ if (pass_volume_key)
+ k = crypt_activate_by_volume_key(cd, argv[2], *p, opt_key_size, flags);
+ else
+ k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, *p, strlen(*p), flags);
+
+ if (k >= 0)
+ break;
+ }
+ }
+
+ if (k >= 0)
+ break;
+
+ if (k != -EPERM) {
+ log_error("Failed to activate: %s", strerror(-k));
+ goto finish;
+ }
+
+ log_warning("Invalid passphrase.");
+ }
+
+ if (try >= opt_tries) {
+ log_error("Too many attempts.");
+ r = EXIT_FAILURE;
+ goto finish;
+ }
+
+ } else if (streq(argv[1], "detach")) {
+ int k;
+
+ if ((k = crypt_init_by_name(&cd, argv[2]))) {
+ log_error("crypt_init() failed: %s", strerror(-k));
+ goto finish;
+ }
+
+ crypt_set_log_callback(cd, log_glue, NULL);
+
+ if ((k = crypt_deactivate(cd, argv[2])) < 0) {
+ log_error("Failed to deactivate: %s", strerror(-k));
+ goto finish;
+ }
+
+ } else {
+ log_error("Unknown verb %s.", argv[1]);
+ goto finish;
+ }
+
+ r = EXIT_SUCCESS;
+
+finish:
+
+ if (cd)
+ crypt_free(cd);
+
+ free(opt_cipher);
+ free(opt_hash);
+
+ free(truncated_cipher);
+
+ strv_free(passwords);
+
+ free(description);
+ free(mount_point);
+ free(name_buffer);
+
+ return r;
+}
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