-/*-*- 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 "sd-device.h"
-#include "device-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 char *arg_header = 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 (STR_IN_SET(option, "noauto", "auto", "nofail", "fail"))
- 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, "header=")) {
- arg_type = CRYPT_LUKS1;
-
- if (!path_is_absolute(option+7)) {
- log_error("Header path '%s' is not absolute, refusing.", option+7);
- return -EINVAL;
- }
-
- if (arg_header) {
- log_error("Duplicate header= options, refusing.");
- return -EINVAL;
- }
-
- arg_header = strdup(option+7);
- if (!arg_header)
- return log_oom();
-
- } 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_device_unref_ sd_device *device = NULL;
- struct stat st;
- const char *i;
- int r;
-
- assert(path);
-
- if (stat(path, &st) < 0)
- return NULL;
-
- if (!S_ISBLK(st.st_mode))
- return NULL;
-
- r = sd_device_new_from_devnum(&device, 'b', st.st_rdev);
- if (r < 0)
- return NULL;
-
- NULSTR_FOREACH(i, name_fields) {
- const char *name;
-
- r = sd_device_get_property_value(device, i, &name);
- if (r >= 0 && !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 = strjoina("cryptsetup:", escaped_name);
-
- r = ask_password_auto(text, "drive-harddisk", id, until, accept_cached, passwords);
- if (r < 0)
- return log_error_errno(r, "Failed to query password: %m");
-
- 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 = strjoina("cryptsetup-verification:", escaped_name);
-
- r = ask_password_auto(text, "drive-harddisk", id, until, false, &passwords2);
- if (r < 0)
- return log_error_errno(r, "Failed to query verification password: %m");
-
- 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_errno(r, "Failed to read password file '%s': %m", key_file);
- 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,
- const char *data_device,
- 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 (r < 0) {
- log_error("crypt_load() failed on device %s.\n", crypt_get_device_name(cd));
- return r;
- }
-
- if (data_device)
- r = crypt_set_data_device(cd, data_device);
- }
-
- 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 if (!key_file)
- /* for CRYPT_PLAIN, the behaviour of cryptsetup
- * package is to not hash when a key file is provided */
- 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)
- return log_error_errno(r, "Loading of cryptographic parameters failed: %m");
-
- 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_errno(r, "Failed to activate with key file '%s': %m", key_file);
- 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];
-
- if (arg_header) {
- log_debug("LUKS header: %s", arg_header);
- k = crypt_init(&cd, arg_header);
- } else
- k = crypt_init(&cd, argv[3]);
-
- if (k) {
- log_error_errno(k, "crypt_init() failed: %m");
- 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 && S_ISREG(st.st_mode) && (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,
- arg_header ? argv[3] : NULL,
- passwords,
- flags);
- if (k >= 0)
- break;
- else if (k == -EAGAIN) {
- key_file = NULL;
- continue;
- } else if (k != -EPERM) {
- log_error_errno(k, "Failed to activate: %m");
- 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_errno(k, "crypt_init() failed: %m");
- goto finish;
- }
-
- crypt_set_log_callback(cd, log_glue, NULL);
-
- k = crypt_deactivate(cd, argv[2]);
- if (k < 0) {
- log_error_errno(k, "Failed to deactivate: %m");
- 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);
- free(arg_header);
- strv_free(arg_tcrypt_keyfiles);
-
- return r;
-}
~ianmdlvl / elogind.git / commitdiff