X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcryptsetup.c;h=c80572aed9672f26c0255cbac561182b21a017dc;hp=22312477d2587ade1aed77e88e55aa16bbb80f27;hb=039655a40c77f88e4f9ccc00824f2f483f22f2c1;hpb=e23a0ce8badd09aefa961a3a576bfe85f6ebbad7 diff --git a/src/cryptsetup.c b/src/cryptsetup.c index 22312477d..c80572aed 100644 --- a/src/cryptsetup.c +++ b/src/cryptsetup.c @@ -20,34 +20,410 @@ ***/ #include +#include +#include + +#include +#include #include "log.h" #include "util.h" +#include "ask-password-api.h" + +static const char *opt_type = NULL; /* LUKS1 or PLAIN */ +static char *opt_cipher = NULL; +static unsigned opt_key_size = 0; +static char *opt_hash = NULL; +static unsigned opt_tries = 0; +static bool opt_readonly = false; +static bool opt_verify = false; +static usec_t opt_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")) + 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, "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, "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 + 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"))) + description = strdup(model); + +finish: + if (device) + udev_device_unref(device); + + if (udev) + udev_unref(udev); + + return description; +} int main(int argc, char *argv[]) { - int r = EXIT_SUCCESS; + int r = EXIT_FAILURE; + struct crypt_device *cd = NULL; + char *password = NULL, *truncated_cipher = NULL; + const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL, *name = NULL; + char *description = NULL; if (argc < 3) { log_error("This program requires at least two arguments."); return EXIT_FAILURE; } - log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); + log_set_target(LOG_TARGET_AUTO); log_parse_environment(); log_open(); - if (streq(argv[1], "create")) { + 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; + + 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]); - } else if (streq(argv[1], "format")) { + /* A delicious drop of snake oil */ + mlockall(MCL_FUTURE); + description = disk_description(argv[3]); + name = description ? description : argv[2]; - } else if (streq(argv[1], "remove")) { + 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; + + until = now(CLOCK_MONOTONIC) + (opt_timeout > 0 ? opt_timeout : 60 * USEC_PER_SEC); + + 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_error("Out of memory"); + 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; + + free(password); + password = NULL; + + if (!key_file) { + char *text; + + if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) { + log_error("Out of memory"); + goto finish; + } + + k = ask_password_auto(text, "drive-harddisk", until, &password); + free(text); + + if (k < 0) { + log_error("Failed to query password: %s", strerror(-k)); + goto finish; + } + + if (opt_verify) { + char *password2 = NULL; + + if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) { + log_error("Out of memory"); + goto finish; + } + + k = ask_password_auto(text, "drive-harddisk", until, &password2); + free(text); + + if (k < 0) { + log_error("Failed to query verification password: %s", strerror(-k)); + goto finish; + } + + if (!streq(password, password2)) { + log_warning("Passwords did not match, retrying."); + free(password2); + continue; + } + + free(password2); + } + + if (strlen(password)+1 < opt_key_size) { + char *c; + + /* Pad password if necessary */ + + if (!(c = new(char, opt_key_size))) { + log_error("Out of memory."); + goto finish; + } + + strncpy(c, password, opt_key_size); + free(password); + password = c; + } + } + + 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; + + /* 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_key_size / 8, + ¶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(cd, argv[2], CRYPT_ANY_SLOT, key_file, opt_key_size, flags); + else if (pass_volume_key) + k = crypt_activate_by_volume_key(cd, argv[2], password, opt_key_size, flags); + else + k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, password, strlen(password), flags); + + 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); + + free(password); + + free(description); + return r; }