/*-*- 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 <libudev.h> #include "log.h" #include "util.h" #include "path-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 unsigned opt_keyfile_size = 0; static unsigned opt_keyfile_offset = 0; static char *opt_hash = NULL; static unsigned opt_tries = 0; static bool opt_readonly = false; static bool opt_verify = false; static bool opt_discards = 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, "keyfile-size=")) { if (safe_atou(option+13, &opt_keyfile_size) < 0) { log_error("keyfile-size= parse failure, ignoring."); return 0; } } else if (startswith(option, "keyfile-offset=")) { if (safe_atou(option+15, &opt_keyfile_offset) < 0) { log_error("keyfile-offset= 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, "allow-discards")) opt_discards = 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; f = setmntent("/etc/fstab", "r"); if (!f) 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; 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_discards) flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS; 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_oom(); 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_oom(); 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_oom(); 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_oom(); 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; /* for CRYPT_PLAIN limit reads * from keyfile to key length, and * ignore keyfile-size */ opt_keyfile_size = opt_key_size / 8; /* 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_keyfile_size, ¶ms); pass_volume_key = streq(hash, "plain"); } 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_offset(cd, argv[2], CRYPT_ANY_SLOT, key_file, opt_keyfile_size, opt_keyfile_offset, 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; }