| /*-*- 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 Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser 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 "fileio.h" |
| #include "log.h" |
| #include "util.h" |
| #include "path-util.h" |
| #include "strv.h" |
| #include "ask-password-api.h" |
| #include "def.h" |
| #include "libudev.h" |
| #include "udev-util.h" |
| |
| static const char *arg_type = NULL; /* CRYPT_LUKS1, CRYPT_TCRYPT or CRYPT_PLAIN */ |
| static char *arg_cipher = NULL; |
| static unsigned arg_key_size = 0; |
| static int arg_key_slot = CRYPT_ANY_SLOT; |
| static unsigned arg_keyfile_size = 0; |
| static unsigned arg_keyfile_offset = 0; |
| static char *arg_hash = NULL; |
| static unsigned arg_tries = 3; |
| static bool arg_readonly = false; |
| static bool arg_verify = false; |
| static bool arg_discards = false; |
| static bool arg_tcrypt_hidden = false; |
| static bool arg_tcrypt_system = false; |
| static char **arg_tcrypt_keyfiles = NULL; |
| static usec_t arg_timeout = 0; |
| |
| /* 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") || streq(option, "nofail")) |
| return 0; |
| |
| if (startswith(option, "cipher=")) { |
| char *t; |
| |
| t = strdup(option+7); |
| if (!t) |
| return log_oom(); |
| |
| free(arg_cipher); |
| arg_cipher = t; |
| |
| } else if (startswith(option, "size=")) { |
| |
| if (safe_atou(option+5, &arg_key_size) < 0) { |
| log_error("size= parse failure, ignoring."); |
| return 0; |
| } |
| |
| if (arg_key_size % 8) { |
| log_error("size= not a multiple of 8, ignoring."); |
| return 0; |
| } |
| |
| arg_key_size /= 8; |
| |
| } else if (startswith(option, "key-slot=")) { |
| |
| arg_type = CRYPT_LUKS1; |
| if (safe_atoi(option+9, &arg_key_slot) < 0) { |
| log_error("key-slot= parse failure, ignoring."); |
| return 0; |
| } |
| |
| } else if (startswith(option, "tcrypt-keyfile=")) { |
| |
| arg_type = CRYPT_TCRYPT; |
| if (path_is_absolute(option+15)) { |
| if (strv_extend(&arg_tcrypt_keyfiles, option + 15) < 0) |
| return log_oom(); |
| } else |
| log_error("Key file path '%s' is not absolute. Ignoring.", option+15); |
| |
| } else if (startswith(option, "keyfile-size=")) { |
| |
| if (safe_atou(option+13, &arg_keyfile_size) < 0) { |
| log_error("keyfile-size= parse failure, ignoring."); |
| return 0; |
| } |
| |
| } else if (startswith(option, "keyfile-offset=")) { |
| |
| if (safe_atou(option+15, &arg_keyfile_offset) < 0) { |
| log_error("keyfile-offset= parse failure, ignoring."); |
| return 0; |
| } |
| |
| } else if (startswith(option, "hash=")) { |
| char *t; |
| |
| t = strdup(option+5); |
| if (!t) |
| return log_oom(); |
| |
| free(arg_hash); |
| arg_hash = t; |
| |
| } else if (startswith(option, "tries=")) { |
| |
| if (safe_atou(option+6, &arg_tries) < 0) { |
| log_error("tries= parse failure, ignoring."); |
| return 0; |
| } |
| |
| } else if (STR_IN_SET(option, "readonly", "read-only")) |
| arg_readonly = true; |
| else if (streq(option, "verify")) |
| arg_verify = true; |
| else if (STR_IN_SET(option, "allow-discards", "discard")) |
| arg_discards = true; |
| else if (streq(option, "luks")) |
| arg_type = CRYPT_LUKS1; |
| else if (streq(option, "tcrypt")) |
| arg_type = CRYPT_TCRYPT; |
| else if (streq(option, "tcrypt-hidden")) { |
| arg_type = CRYPT_TCRYPT; |
| arg_tcrypt_hidden = true; |
| } else if (streq(option, "tcrypt-system")) { |
| arg_type = CRYPT_TCRYPT; |
| arg_tcrypt_system = true; |
| } else if (STR_IN_SET(option, "plain", "swap", "tmp")) |
| arg_type = CRYPT_PLAIN; |
| else if (startswith(option, "timeout=")) { |
| |
| if (parse_sec(option+8, &arg_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) { |
| const char *word, *state; |
| size_t l; |
| int r; |
| |
| assert(options); |
| |
| FOREACH_WORD_SEPARATOR(word, l, options, ",", state) { |
| _cleanup_free_ char *o; |
| |
| o = strndup(word, l); |
| if (!o) |
| return -ENOMEM; |
| r = parse_one_option(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) { |
| |
| static const char name_fields[] = |
| "ID_PART_ENTRY_NAME\0" |
| "DM_NAME\0" |
| "ID_MODEL_FROM_DATABASE\0" |
| "ID_MODEL\0"; |
| |
| _cleanup_udev_unref_ struct udev *udev = NULL; |
| _cleanup_udev_device_unref_ struct udev_device *device = NULL; |
| struct stat st; |
| const char *i; |
| |
| assert(path); |
| |
| if (stat(path, &st) < 0) |
| return NULL; |
| |
| if (!S_ISBLK(st.st_mode)) |
| return NULL; |
| |
| udev = udev_new(); |
| if (!udev) |
| return NULL; |
| |
| device = udev_device_new_from_devnum(udev, 'b', st.st_rdev); |
| if (!device) |
| return NULL; |
| |
| NULSTR_FOREACH(i, name_fields) { |
| const char *name; |
| |
| name = udev_device_get_property_value(device, i); |
| if (!isempty(name)) |
| return strdup(name); |
| } |
| |
| return NULL; |
| } |
| |
| static char *disk_mount_point(const char *label) { |
| _cleanup_free_ char *device = NULL; |
| _cleanup_endmntent_ 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) |
| return NULL; |
| |
| f = setmntent("/etc/fstab", "r"); |
| if (!f) |
| return NULL; |
| |
| while ((m = getmntent(f))) |
| if (path_equal(m->mnt_fsname, device)) |
| return strdup(m->mnt_dir); |
| |
| return NULL; |
| } |
| |
| static int get_password(const char *name, usec_t until, bool accept_cached, char ***passwords) { |
| int r; |
| char **p; |
| _cleanup_free_ char *text = NULL; |
| _cleanup_free_ char *escaped_name = NULL; |
| char *id; |
| |
| assert(name); |
| assert(passwords); |
| |
| if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) |
| return log_oom(); |
| |
| escaped_name = cescape(name); |
| if (!escaped_name) |
| return log_oom(); |
| |
| id = strappenda("cryptsetup:", escaped_name); |
| |
| r = ask_password_auto(text, "drive-harddisk", id, until, accept_cached, passwords); |
| if (r < 0) { |
| log_error("Failed to query password: %s", strerror(-r)); |
| return r; |
| } |
| |
| if (arg_verify) { |
| _cleanup_strv_free_ char **passwords2 = NULL; |
| |
| assert(strv_length(*passwords) == 1); |
| |
| if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) |
| return log_oom(); |
| |
| id = strappenda("cryptsetup-verification:", escaped_name); |
| |
| r = ask_password_auto(text, "drive-harddisk", id, until, false, &passwords2); |
| if (r < 0) { |
| log_error("Failed to query verification password: %s", strerror(-r)); |
| return r; |
| } |
| |
| assert(strv_length(passwords2) == 1); |
| |
| if (!streq(*passwords[0], passwords2[0])) { |
| log_warning("Passwords did not match, retrying."); |
| return -EAGAIN; |
| } |
| } |
| |
| strv_uniq(*passwords); |
| |
| STRV_FOREACH(p, *passwords) { |
| char *c; |
| |
| if (strlen(*p)+1 >= arg_key_size) |
| continue; |
| |
| /* Pad password if necessary */ |
| if (!(c = new(char, arg_key_size))) |
| return log_oom(); |
| |
| strncpy(c, *p, arg_key_size); |
| free(*p); |
| *p = c; |
| } |
| |
| 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 **)arg_tcrypt_keyfiles, |
| .keyfiles_count = strv_length(arg_tcrypt_keyfiles) |
| }; |
| |
| assert(cd); |
| assert(name); |
| assert(key_file || (passwords && passwords[0])); |
| |
| if (arg_tcrypt_hidden) |
| params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER; |
| |
| if (arg_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, ¶ms); |
| 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, |
| char **passwords, |
| uint32_t flags) { |
| int r = 0; |
| bool pass_volume_key = false; |
| |
| assert(cd); |
| assert(name); |
| assert(key_file || passwords); |
| |
| if (!arg_type || streq(arg_type, CRYPT_LUKS1)) |
| r = crypt_load(cd, CRYPT_LUKS1, NULL); |
| |
| if ((!arg_type && r < 0) || streq_ptr(arg_type, CRYPT_PLAIN)) { |
| struct crypt_params_plain params = {}; |
| const char *cipher, *cipher_mode; |
| _cleanup_free_ char *truncated_cipher = NULL; |
| |
| if (arg_hash) { |
| /* plain isn't a real hash type. it just means "use no hash" */ |
| if (!streq(arg_hash, "plain")) |
| params.hash = arg_hash; |
| } else |
| params.hash = "ripemd160"; |
| |
| if (arg_cipher) { |
| size_t l; |
| |
| l = strcspn(arg_cipher, "-"); |
| truncated_cipher = strndup(arg_cipher, l); |
| if (!truncated_cipher) |
| return log_oom(); |
| |
| cipher = truncated_cipher; |
| cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain"; |
| } else { |
| cipher = "aes"; |
| cipher_mode = "cbc-essiv:sha256"; |
| } |
| |
| /* for CRYPT_PLAIN limit reads |
| * from keyfile to key length, and |
| * ignore keyfile-size */ |
| arg_keyfile_size = arg_key_size; |
| |
| /* 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. */ |
| r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, |
| NULL, NULL, arg_keyfile_size, ¶ms); |
| |
| /* hash == NULL implies the user passed "plain" */ |
| pass_volume_key = (params.hash == NULL); |
| } |
| |
| if (r < 0) { |
| log_error("Loading of cryptographic parameters failed: %s", strerror(-r)); |
| return r; |
| } |
| |
| 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, |
| crypt_get_device_name(cd)); |
| |
| if (key_file) { |
| r = crypt_activate_by_keyfile_offset(cd, name, arg_key_slot, |
| key_file, arg_keyfile_size, |
| arg_keyfile_offset, flags); |
| if (r < 0) { |
| log_error("Failed to activate with key file '%s': %s", key_file, strerror(-r)); |
| return -EAGAIN; |
| } |
| } else { |
| char **p; |
| |
| STRV_FOREACH(p, passwords) { |
| if (pass_volume_key) |
| r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags); |
| else |
| r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags); |
| |
| if (r >= 0) |
| break; |
| } |
| } |
| |
| return r; |
| } |
| |
| 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; |
| |
| 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 tries; |
| usec_t until; |
| crypt_status_info status; |
| const char *key_file = NULL, *name = NULL; |
| _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL; |
| |
| /* 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], "-")) { |
| if (parse_options(argv[5]) < 0) |
| goto finish; |
| } |
| |
| /* 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; |
| } |
| |
| k = 0; |
| if (mount_point && description) |
| k = asprintf(&name_buffer, "%s (%s) on %s", description, argv[2], mount_point); |
| else if (mount_point) |
| k = asprintf(&name_buffer, "%s on %s", argv[2], mount_point); |
| else if (description) |
| k = asprintf(&name_buffer, "%s (%s)", description, argv[2]); |
| |
| if (k < 0) { |
| log_oom(); |
| goto finish; |
| } |
| name = name_buffer ? name_buffer : argv[2]; |
| |
| k = crypt_init(&cd, argv[3]); |
| if (k) { |
| 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 (arg_readonly) |
| flags |= CRYPT_ACTIVATE_READONLY; |
| |
| if (arg_discards) |
| flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS; |
| |
| if (arg_timeout > 0) |
| until = now(CLOCK_MONOTONIC) + arg_timeout; |
| else |
| until = 0; |
| |
| arg_key_size = (arg_key_size > 0 ? arg_key_size : (256 / 8)); |
| |
| if (key_file) { |
| struct stat st; |
| |
| /* Ideally we'd do this on the open fd, but since this is just a |
| * warning it's OK to do this in two steps. */ |
| if (stat(key_file, &st) >= 0 && (st.st_mode & 0005)) |
| log_warning("Key file %s is world-readable. This is not a good idea!", key_file); |
| } |
| |
| for (tries = 0; arg_tries == 0 || tries < arg_tries; tries++) { |
| _cleanup_strv_free_ char **passwords = NULL; |
| |
| if (!key_file) { |
| k = get_password(name, until, tries == 0 && !arg_verify, &passwords); |
| if (k == -EAGAIN) |
| continue; |
| else if (k < 0) |
| goto finish; |
| } |
| |
| if (streq_ptr(arg_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) { |
| key_file = NULL; |
| continue; |
| } else if (k != -EPERM) { |
| log_error("Failed to activate: %s", strerror(-k)); |
| goto finish; |
| } |
| |
| log_warning("Invalid passphrase."); |
| } |
| |
| if (arg_tries != 0 && tries >= arg_tries) { |
| log_error("Too many attempts; giving up."); |
| r = EXIT_FAILURE; |
| goto finish; |
| } |
| |
| } else if (streq(argv[1], "detach")) { |
| int k; |
| |
| k = crypt_init_by_name(&cd, argv[2]); |
| if (k) { |
| log_error("crypt_init() failed: %s", strerror(-k)); |
| goto finish; |
| } |
| |
| crypt_set_log_callback(cd, log_glue, NULL); |
| |
| k = crypt_deactivate(cd, argv[2]); |
| if (k < 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(arg_cipher); |
| free(arg_hash); |
| strv_free(arg_tcrypt_keyfiles); |
| |
| return r; |
| } |