547 lines
18 KiB
C
547 lines
18 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <mntent.h>
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#include <libcryptsetup.h>
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#include <libudev.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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#include "strv.h"
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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 */
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static char *opt_cipher = NULL;
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static unsigned opt_key_size = 0;
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static unsigned opt_keyfile_offset = 0;
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static char *opt_hash = NULL;
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static unsigned opt_tries = 0;
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static bool opt_readonly = false;
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static bool opt_verify = false;
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static bool opt_discards = false;
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static usec_t opt_timeout = DEFAULT_TIMEOUT_USEC;
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/* Options Debian's crypttab knows we don't:
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offset=
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skip=
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precheck=
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check=
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checkargs=
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noearly=
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loud=
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keyscript=
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*/
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static int parse_one_option(const char *option) {
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assert(option);
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/* Handled outside of this tool */
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if (streq(option, "noauto"))
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return 0;
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if (startswith(option, "cipher=")) {
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char *t;
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if (!(t = strdup(option+7)))
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return -ENOMEM;
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free(opt_cipher);
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opt_cipher = t;
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} else if (startswith(option, "size=")) {
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if (safe_atou(option+5, &opt_key_size) < 0) {
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log_error("size= parse failure, ignoring.");
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return 0;
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}
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} else if (startswith(option, "keyfile-offset=")) {
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if (safe_atou(option+15, &opt_keyfile_offset) < 0) {
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log_error("keyfile-offset= parse failure, ignoring.");
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return 0;
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}
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} else if (startswith(option, "hash=")) {
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char *t;
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if (!(t = strdup(option+5)))
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return -ENOMEM;
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free(opt_hash);
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opt_hash = t;
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} else if (startswith(option, "tries=")) {
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if (safe_atou(option+6, &opt_tries) < 0) {
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log_error("tries= parse failure, ignoring.");
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return 0;
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}
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} else if (streq(option, "readonly"))
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opt_readonly = true;
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else if (streq(option, "verify"))
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opt_verify = true;
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else if (streq(option, "allow-discards"))
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opt_discards = true;
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else if (streq(option, "luks"))
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opt_type = CRYPT_LUKS1;
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else if (streq(option, "plain") ||
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streq(option, "swap") ||
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streq(option, "tmp"))
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opt_type = CRYPT_PLAIN;
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else if (startswith(option, "timeout=")) {
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if (parse_usec(option+8, &opt_timeout) < 0) {
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log_error("timeout= parse failure, ignoring.");
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return 0;
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}
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} else if (!streq(option, "none"))
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log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
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return 0;
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}
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static int parse_options(const char *options) {
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char *state;
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char *w;
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size_t l;
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assert(options);
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FOREACH_WORD_SEPARATOR(w, l, options, ",", state) {
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char *o;
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int r;
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if (!(o = strndup(w, l)))
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return -ENOMEM;
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r = parse_one_option(o);
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free(o);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static void log_glue(int level, const char *msg, void *usrptr) {
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log_debug("%s", msg);
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}
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static char *disk_description(const char *path) {
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struct udev *udev = NULL;
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struct udev_device *device = NULL;
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struct stat st;
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char *description = NULL;
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const char *model;
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assert(path);
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if (stat(path, &st) < 0)
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return NULL;
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if (!S_ISBLK(st.st_mode))
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return NULL;
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if (!(udev = udev_new()))
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return NULL;
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if (!(device = udev_device_new_from_devnum(udev, 'b', st.st_rdev)))
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goto finish;
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if ((model = udev_device_get_property_value(device, "ID_MODEL_FROM_DATABASE")) ||
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(model = udev_device_get_property_value(device, "ID_MODEL")) ||
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(model = udev_device_get_property_value(device, "DM_NAME")))
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description = strdup(model);
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finish:
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if (device)
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udev_device_unref(device);
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if (udev)
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udev_unref(udev);
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return description;
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}
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static char *disk_mount_point(const char *label) {
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char *mp = NULL, *device = NULL;
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FILE *f = NULL;
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struct mntent *m;
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/* Yeah, we don't support native systemd unit files here for now */
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if (asprintf(&device, "/dev/mapper/%s", label) < 0)
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goto finish;
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f = setmntent("/etc/fstab", "r");
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if (!f)
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goto finish;
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while ((m = getmntent(f)))
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if (path_equal(m->mnt_fsname, device)) {
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mp = strdup(m->mnt_dir);
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break;
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}
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finish:
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if (f)
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endmntent(f);
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free(device);
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return mp;
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}
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static int help(void) {
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printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
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"%s detach VOLUME\n\n"
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"Attaches or detaches an encrypted block device.\n",
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program_invocation_short_name,
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program_invocation_short_name);
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return 0;
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}
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int main(int argc, char *argv[]) {
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int r = EXIT_FAILURE;
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struct crypt_device *cd = NULL;
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char **passwords = NULL, *truncated_cipher = NULL;
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const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL, *name = NULL;
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char *description = NULL, *name_buffer = NULL, *mount_point = NULL;
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unsigned keyfile_size = 0;
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if (argc <= 1) {
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help();
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return EXIT_SUCCESS;
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}
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if (argc < 3) {
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log_error("This program requires at least two arguments.");
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return EXIT_FAILURE;
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}
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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if (streq(argv[1], "attach")) {
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uint32_t flags = 0;
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int k;
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unsigned try;
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const char *key_file = NULL;
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usec_t until;
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crypt_status_info status;
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/* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
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if (argc < 4) {
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log_error("attach requires at least two arguments.");
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goto finish;
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}
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if (argc >= 5 &&
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argv[4][0] &&
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!streq(argv[4], "-") &&
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!streq(argv[4], "none")) {
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if (!path_is_absolute(argv[4]))
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log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
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else
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key_file = argv[4];
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}
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if (argc >= 6 && argv[5][0] && !streq(argv[5], "-"))
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parse_options(argv[5]);
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/* A delicious drop of snake oil */
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mlockall(MCL_FUTURE);
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description = disk_description(argv[3]);
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mount_point = disk_mount_point(argv[2]);
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if (description && streq(argv[2], description)) {
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/* If the description string is simply the
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* volume name, then let's not show this
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* twice */
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free(description);
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description = NULL;
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}
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if (mount_point && description)
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asprintf(&name_buffer, "%s (%s) on %s", description, argv[2], mount_point);
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else if (mount_point)
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asprintf(&name_buffer, "%s on %s", argv[2], mount_point);
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else if (description)
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asprintf(&name_buffer, "%s (%s)", description, argv[2]);
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name = name_buffer ? name_buffer : argv[2];
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if ((k = crypt_init(&cd, argv[3]))) {
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log_error("crypt_init() failed: %s", strerror(-k));
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goto finish;
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}
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crypt_set_log_callback(cd, log_glue, NULL);
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status = crypt_status(cd, argv[2]);
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if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) {
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log_info("Volume %s already active.", argv[2]);
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r = EXIT_SUCCESS;
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goto finish;
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}
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if (opt_readonly)
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flags |= CRYPT_ACTIVATE_READONLY;
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if (opt_discards)
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flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
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if (opt_timeout > 0)
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until = now(CLOCK_MONOTONIC) + opt_timeout;
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else
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until = 0;
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opt_tries = opt_tries > 0 ? opt_tries : 3;
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opt_key_size = (opt_key_size > 0 ? opt_key_size : 256);
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hash = opt_hash ? opt_hash : "ripemd160";
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if (opt_cipher) {
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size_t l;
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l = strcspn(opt_cipher, "-");
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if (!(truncated_cipher = strndup(opt_cipher, l))) {
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log_oom();
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goto finish;
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}
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cipher = truncated_cipher;
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cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain";
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} else {
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cipher = "aes";
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cipher_mode = "cbc-essiv:sha256";
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}
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for (try = 0; try < opt_tries; try++) {
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bool pass_volume_key = false;
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strv_free(passwords);
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passwords = NULL;
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if (!key_file) {
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char *text;
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char **p;
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if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) {
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log_oom();
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goto finish;
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}
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k = ask_password_auto(text, "drive-harddisk", until, try == 0 && !opt_verify, &passwords);
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free(text);
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if (k < 0) {
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log_error("Failed to query password: %s", strerror(-k));
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goto finish;
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}
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if (opt_verify) {
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char **passwords2 = NULL;
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assert(strv_length(passwords) == 1);
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if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) {
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log_oom();
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goto finish;
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}
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k = ask_password_auto(text, "drive-harddisk", until, false, &passwords2);
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free(text);
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if (k < 0) {
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log_error("Failed to query verification password: %s", strerror(-k));
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goto finish;
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}
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assert(strv_length(passwords2) == 1);
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if (!streq(passwords[0], passwords2[0])) {
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log_warning("Passwords did not match, retrying.");
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strv_free(passwords2);
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continue;
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}
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strv_free(passwords2);
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}
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strv_uniq(passwords);
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STRV_FOREACH(p, passwords) {
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char *c;
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if (strlen(*p)+1 >= opt_key_size)
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continue;
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/* Pad password if necessary */
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if (!(c = new(char, opt_key_size))) {
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log_oom();
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goto finish;
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}
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strncpy(c, *p, opt_key_size);
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free(*p);
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*p = c;
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}
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}
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k = 0;
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if (!opt_type || streq(opt_type, CRYPT_LUKS1))
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k = crypt_load(cd, CRYPT_LUKS1, NULL);
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if ((!opt_type && k < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) {
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struct crypt_params_plain params;
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zero(params);
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params.hash = hash;
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/* In contrast to what the name
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* crypt_setup() might suggest this
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* doesn't actually format anything,
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* it just configures encryption
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* parameters when used for plain
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* mode. */
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k = crypt_format(cd, CRYPT_PLAIN,
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cipher,
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cipher_mode,
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NULL,
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NULL,
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opt_key_size / 8,
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¶ms);
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pass_volume_key = streq(hash, "plain");
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/* for CRYPT_PLAIN limit reads
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* from keyfile to key length */
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keyfile_size = opt_key_size / 8;
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}
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if (k < 0) {
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log_error("Loading of cryptographic parameters failed: %s", strerror(-k));
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goto finish;
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}
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log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
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crypt_get_cipher(cd),
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crypt_get_cipher_mode(cd),
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crypt_get_volume_key_size(cd)*8,
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argv[3]);
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if (key_file)
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k = crypt_activate_by_keyfile_offset(cd, argv[2], CRYPT_ANY_SLOT, key_file, keyfile_size,
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opt_keyfile_offset, flags);
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else {
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char **p;
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STRV_FOREACH(p, passwords) {
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if (pass_volume_key)
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k = crypt_activate_by_volume_key(cd, argv[2], *p, opt_key_size, flags);
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else
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k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, *p, strlen(*p), flags);
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if (k >= 0)
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break;
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}
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}
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if (k >= 0)
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break;
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if (k != -EPERM) {
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log_error("Failed to activate: %s", strerror(-k));
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goto finish;
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}
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log_warning("Invalid passphrase.");
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}
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if (try >= opt_tries) {
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log_error("Too many attempts.");
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r = EXIT_FAILURE;
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goto finish;
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}
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} else if (streq(argv[1], "detach")) {
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int k;
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if ((k = crypt_init_by_name(&cd, argv[2]))) {
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log_error("crypt_init() failed: %s", strerror(-k));
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goto finish;
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}
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crypt_set_log_callback(cd, log_glue, NULL);
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if ((k = crypt_deactivate(cd, argv[2])) < 0) {
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log_error("Failed to deactivate: %s", strerror(-k));
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goto finish;
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}
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} else {
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log_error("Unknown verb %s.", argv[1]);
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goto finish;
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}
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r = EXIT_SUCCESS;
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finish:
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if (cd)
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crypt_free(cd);
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free(opt_cipher);
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free(opt_hash);
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free(truncated_cipher);
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strv_free(passwords);
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free(description);
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free(mount_point);
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free(name_buffer);
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return r;
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}
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