X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fcryptsetup%2Fcryptsetup.c;h=9b9074c52ad0c49af3aa3adfd1cb68caf6c314a7;hb=a2b135e3d8d5dfa103a87e304ed8a91b01fdbb02;hp=e84ebba683f5770140f026dc7ad287584ad42ca6;hpb=10fb4e35fd8a44340f695e49230dc61b5766d47a;p=elogind.git diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c index e84ebba68..9b9074c52 100644 --- a/src/cryptsetup/cryptsetup.c +++ b/src/cryptsetup/cryptsetup.c @@ -25,26 +25,32 @@ #include #include -#include +#include "fileio.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 = 0; +#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: @@ -70,28 +76,45 @@ static int parse_one_option(const char *option) { t = strdup(option+7); if (!t) - return -ENOMEM; + return log_oom(); - free(opt_cipher); - opt_cipher = t; + free(arg_cipher); + arg_cipher = t; } else if (startswith(option, "size=")) { - if (safe_atou(option+5, &opt_key_size) < 0) { + if (safe_atou(option+5, &arg_key_size) < 0) { log_error("size= parse failure, ignoring."); return 0; } + } 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, &opt_keyfile_size) < 0) { + 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, &opt_keyfile_offset) < 0) { + if (safe_atou(option+15, &arg_keyfile_offset) < 0) { log_error("keyfile-offset= parse failure, ignoring."); return 0; } @@ -101,33 +124,39 @@ static int parse_one_option(const char *option) { t = strdup(option+5); if (!t) - return -ENOMEM; + return log_oom(); - free(opt_hash); - opt_hash = t; + free(arg_hash); + arg_hash = t; } else if (startswith(option, "tries=")) { - if (safe_atou(option+6, &opt_tries) < 0) { + if (safe_atou(option+6, &arg_tries) < 0) { log_error("tries= parse failure, ignoring."); return 0; } - } else if (streq(option, "readonly") || streq(option, "read-only")) - opt_readonly = true; + } else if (STR_IN_SET(option, "readonly", "read-only")) + arg_readonly = true; else if (streq(option, "verify")) - opt_verify = true; - else if (streq(option, "allow-discards")) - opt_discards = true; + arg_verify = true; + else if (STR_IN_SET(option, "allow-discards", "discard")) + arg_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; + 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, &opt_timeout) < 0) { + if (parse_sec(option+8, &arg_timeout) < 0) { log_error("timeout= parse failure, ignoring."); return 0; } @@ -163,19 +192,17 @@ static void log_glue(int level, const char *msg, void *usrptr) { log_debug("%s", msg); } -static char *disk_description(const char *path) { +static char* disk_description(const char *path) { - static const char name_fields[] = { + static const char name_fields[] = "ID_PART_ENTRY_NAME\0" "DM_NAME\0" "ID_MODEL_FROM_DATABASE\0" - "ID_MODEL\0" - }; + "ID_MODEL\0"; - struct udev *udev = NULL; - struct udev_device *device = NULL; + _cleanup_udev_unref_ struct udev *udev = NULL; + _cleanup_udev_device_unref_ struct udev_device *device = NULL; struct stat st; - char *description = NULL; const char *i; assert(path); @@ -192,54 +219,38 @@ static char *disk_description(const char *path) { device = udev_device_new_from_devnum(udev, 'b', st.st_rdev); if (!device) - goto finish; + return NULL; NULSTR_FOREACH(i, name_fields) { const char *name; name = udev_device_get_property_value(device, i); - if (!isempty(name)) { - description = strdup(name); - break; - } + if (!isempty(name)) + return strdup(name); } -finish: - if (device) - udev_device_unref(device); - - if (udev) - udev_unref(udev); - - return description; + return NULL; } static char *disk_mount_point(const char *label) { - char *mp = NULL; _cleanup_free_ char *device = NULL; - FILE *f = 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) - goto finish; + return NULL; f = setmntent("/etc/fstab", "r"); if (!f) - goto finish; + return NULL; while ((m = getmntent(f))) - if (path_equal(m->mnt_fsname, device)) { - mp = strdup(m->mnt_dir); - break; - } + if (path_equal(m->mnt_fsname, device)) + return strdup(m->mnt_dir); -finish: - if (f) - endmntent(f); - - return mp; + return NULL; } static int get_password(const char *name, usec_t until, bool accept_cached, char ***passwords) { @@ -259,7 +270,7 @@ static int get_password(const char *name, usec_t until, bool accept_cached, char return r; } - if (opt_verify) { + if (arg_verify) { _cleanup_strv_free_ char **passwords2 = NULL; assert(strv_length(*passwords) == 1); @@ -286,14 +297,14 @@ static int get_password(const char *name, usec_t until, bool accept_cached, char STRV_FOREACH(p, *passwords) { char *c; - if (strlen(*p)+1 >= opt_key_size) + if (strlen(*p)+1 >= arg_key_size) continue; /* Pad password if necessary */ - if (!(c = new(char, opt_key_size))) + if (!(c = new(char, arg_key_size))) return log_oom(); - strncpy(c, *p, opt_key_size); + strncpy(c, *p, arg_key_size); free(*p); *p = c; } @@ -301,6 +312,53 @@ static int get_password(const char *name, usec_t until, bool accept_cached, char 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); + + 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, @@ -313,31 +371,31 @@ static int attach_luks_or_plain(struct crypt_device *cd, assert(name); assert(key_file || passwords); - if (!opt_type || streq(opt_type, CRYPT_LUKS1)) + if (!arg_type || streq(arg_type, CRYPT_LUKS1)) r = crypt_load(cd, CRYPT_LUKS1, NULL); - if ((!opt_type && r < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) { + 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 (opt_hash) { + if (arg_hash) { /* plain isn't a real hash type. it just means "use no hash" */ - if (!streq(opt_hash, "plain")) - params.hash = opt_hash; + if (!streq(arg_hash, "plain")) + params.hash = arg_hash; } else params.hash = "ripemd160"; - if (opt_cipher) { + if (arg_cipher) { size_t l; - l = strcspn(opt_cipher, "-"); - truncated_cipher = strndup(opt_cipher, l); + l = strcspn(arg_cipher, "-"); + truncated_cipher = strndup(arg_cipher, l); if (!truncated_cipher) return log_oom(); cipher = truncated_cipher; - cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain"; + cipher_mode = arg_cipher[l] ? arg_cipher+l+1 : "plain"; } else { cipher = "aes"; cipher_mode = "cbc-essiv:sha256"; @@ -346,7 +404,7 @@ static int attach_luks_or_plain(struct crypt_device *cd, /* for CRYPT_PLAIN limit reads * from keyfile to key length, and * ignore keyfile-size */ - opt_keyfile_size = opt_key_size / 8; + arg_keyfile_size = arg_key_size / 8; /* In contrast to what the name * crypt_setup() might suggest this @@ -355,7 +413,7 @@ static int attach_luks_or_plain(struct crypt_device *cd, * parameters when used for plain * mode. */ r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, - NULL, NULL, opt_keyfile_size, ¶ms); + NULL, NULL, arg_keyfile_size, ¶ms); /* hash == NULL implies the user passed "plain" */ pass_volume_key = (params.hash == NULL); @@ -373,9 +431,9 @@ static int attach_luks_or_plain(struct crypt_device *cd, crypt_get_device_name(cd)); if (key_file) { - r = crypt_activate_by_keyfile_offset(cd, name, CRYPT_ANY_SLOT, - key_file, opt_keyfile_size, - opt_keyfile_offset, flags); + 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; @@ -385,9 +443,9 @@ static int attach_luks_or_plain(struct crypt_device *cd, STRV_FOREACH(p, passwords) { if (pass_volume_key) - r = crypt_activate_by_volume_key(cd, name, *p, opt_key_size, flags); + r = crypt_activate_by_volume_key(cd, name, *p, arg_key_size, flags); else - r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, *p, strlen(*p), flags); + r = crypt_activate_by_passphrase(cd, name, arg_key_slot, *p, strlen(*p), flags); if (r >= 0) break; @@ -450,7 +508,7 @@ int main(int argc, char *argv[]) { !streq(argv[4], "none")) { if (!path_is_absolute(argv[4])) - log_error("Password file path %s is not absolute. Ignoring.", argv[4]); + log_error("Password file path '%s' is not absolute. Ignoring.", argv[4]); else key_file = argv[4]; } @@ -498,19 +556,18 @@ int main(int argc, char *argv[]) { goto finish; } - if (opt_readonly) + if (arg_readonly) flags |= CRYPT_ACTIVATE_READONLY; - if (opt_discards) + if (arg_discards) flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS; - if (opt_timeout > 0) - until = now(CLOCK_MONOTONIC) + opt_timeout; + if (arg_timeout > 0) + until = now(CLOCK_MONOTONIC) + arg_timeout; else until = 0; - opt_tries = opt_tries > 0 ? opt_tries : 3; - opt_key_size = (opt_key_size > 0 ? opt_key_size : 256); + arg_key_size = (arg_key_size > 0 ? arg_key_size : 256); if (key_file) { struct stat st; @@ -521,18 +578,21 @@ int main(int argc, char *argv[]) { log_warning("Key file %s is world-readable. This is not a good idea!", key_file); } - for (tries = 0; tries < opt_tries; tries++) { + 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 && !opt_verify, &passwords); + k = get_password(name, until, tries == 0 && !arg_verify, &passwords); if (k == -EAGAIN) continue; else if (k < 0) goto finish; } - k = attach_luks_or_plain(cd, argv[2], key_file, passwords, flags); + 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) { @@ -546,7 +606,7 @@ int main(int argc, char *argv[]) { log_warning("Invalid passphrase."); } - if (tries >= opt_tries) { + if (arg_tries != 0 && tries >= arg_tries) { log_error("Too many attempts; giving up."); r = EXIT_FAILURE; goto finish; @@ -581,8 +641,9 @@ finish: if (cd) crypt_free(cd); - free(opt_cipher); - free(opt_hash); + free(arg_cipher); + free(arg_hash); + strv_free(arg_tcrypt_keyfiles); return r; }