| /*-*- 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 |
| 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(); |
| |
| 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, |
| ¶ms); |
| |
| 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; |
| } |