diff options
author | Anthony G. Basile <blueness@gentoo.org> | 2012-11-15 10:10:41 -0500 |
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committer | Anthony G. Basile <blueness@gentoo.org> | 2012-11-15 10:10:41 -0500 |
commit | 2944f347d087ff24ec808e4b70fe104a772a97a0 (patch) | |
tree | a5de4fbefe16ef359a526442fb41251f123399d5 /src/cryptsetup/cryptsetup.c | |
parent | 678b0b89572768b21d8b74360d55b75b233799c4 (diff) | |
parent | d025f1e4dca8fc1436aff76f9e6185fe3e728daa (diff) |
Fork of Original Code Base: anongit.freedesktop.org/systemd
This is the initial fork of the code base from freedsktop.org.
The code is provided here as a reference of the initial starting
point and for possible future checkouts after a large portion
of this code is removed.
Merge git://anongit.freedesktop.org/systemd/systemd
Diffstat (limited to 'src/cryptsetup/cryptsetup.c')
-rw-r--r-- | src/cryptsetup/cryptsetup.c | 560 |
1 files changed, 560 insertions, 0 deletions
diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c new file mode 100644 index 0000000000..56a3b50974 --- /dev/null +++ b/src/cryptsetup/cryptsetup.c @@ -0,0 +1,560 @@ +/*-*- 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); + if (opt_hash) { + /* plain isn't a real hash type. it just means "use no hash" */ + if (!streq(opt_hash, "plain")) + hash = opt_hash; + } else + 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); + + /* hash == NULL implies the user passed "plain" */ + pass_volume_key = (hash == NULL); + } + + 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; +} |