X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcryptsetup.c;h=c103aa9e03e329735b7e702f3802276d8dbb3e9c;hp=d9b9ebe69765697be205bf0396eb6aa879f7bd5c;hb=b853f6e9d60c0eab2038227718ee1ed1266f94de;hpb=bb7df0da2d14800d4cb871ab07a9d3595990fbad;ds=sidebyside diff --git a/src/cryptsetup.c b/src/cryptsetup.c index d9b9ebe69..c103aa9e0 100644 --- a/src/cryptsetup.c +++ b/src/cryptsetup.c @@ -21,6 +21,7 @@ #include #include +#include #include @@ -28,21 +29,32 @@ #include "util.h" #include "ask-password-api.h" -static unsigned opt_tries = 0; +static const char *opt_type = NULL; /* LUKS1 or PLAIN */ static char *opt_cipher = NULL; -static unsigned opt_size = 0; +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 arg_timeout = 0; +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, "swap") || - streq(option, "tmp") || - streq(option, "noauto")) + if (streq(option, "noauto")) return 0; if (startswith(option, "cipher=")) { @@ -56,7 +68,7 @@ static int parse_one_option(const char *option) { } else if (startswith(option, "size=")) { - if (safe_atou(option+5, &opt_size) < 0) { + if (safe_atou(option+5, &opt_key_size) < 0) { log_error("size= parse failure, ignoring."); return 0; } @@ -81,9 +93,15 @@ static int parse_one_option(const char *option) { 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, &arg_timeout) < 0) { + if (parse_usec(option+8, &opt_timeout) < 0) { log_error("timeout= parse failure, ignoring."); return 0; } @@ -119,35 +137,14 @@ static int parse_options(const char *options) { } static void log_glue(int level, const char *msg, void *usrptr) { - - log_full(level == CRYPT_LOG_ERROR ? LOG_ERR : - level == CRYPT_LOG_VERBOSE ? LOG_INFO : - level == CRYPT_LOG_DEBUG ? LOG_DEBUG : - LOG_NOTICE, - "%s", msg); -} - -static int password_glue(const char *msg, char *buf, size_t length, void *usrptr) { - usec_t until; - char *password = NULL; - int k; - - until = now(CLOCK_MONOTONIC) + (arg_timeout > 0 ? arg_timeout : 60 * USEC_PER_SEC); - - if ((k = ask_password_agent(msg, "drive-harddisk", until, &password)) < 0) - return k; - - strncpy(buf, password, length-1); - buf[length-1] = 0; - - free(password); - - return strlen(buf); + log_debug("%s", msg); } int main(int argc, char *argv[]) { int r = EXIT_FAILURE; struct crypt_device *cd = NULL; + char *password = NULL, *truncated_cipher = NULL; + const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL; if (argc < 3) { log_error("This program requires at least two arguments."); @@ -158,18 +155,23 @@ int main(int argc, char *argv[]) { log_parse_environment(); log_open(); - if (streq(argv[1], "attach") || - streq(argv[1], "format-and-attach")) { + 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], "-")) { + 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]); @@ -180,40 +182,153 @@ int main(int argc, char *argv[]) { if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) parse_options(argv[5]); + /* A delicious drop of snake oil */ + mlockall(MCL_FUTURE); + 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); - crypt_set_password_callback(cd, password_glue, NULL); - - if (streq(argv[1], "format-and-attach")) { - - /* Format with random key and attach */ - - log_error("Formatting not yet supported."); - goto finish; - } else if ((k = crypt_load(cd, CRYPT_LUKS1, NULL))) { - log_error("crypt_load() failed: %s", strerror(-k)); + 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 (key_file) { - crypt_set_password_retry(cd, 1); - k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, 0, flags); - } else { - crypt_set_password_retry(cd, opt_tries > 0 ? opt_tries : 3); - k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, NULL, 0, flags); + 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"; } - if (k < 0) { - log_error("Failed to activate: %s", strerror(-k)); - goto finish; + for (try = 0; try < opt_tries; try++) { + bool pass_volume_key = false; + + free(password); + password = NULL; + + if (!key_file) { + + if ((k = ask_password_auto("Please enter passphrase for disk:", "drive-harddisk", until, &password)) < 0) { + log_error("Failed to query password: %s", strerror(-k)); + goto finish; + } + + if (opt_verify) { + char *password2 = NULL; + + if ((k = ask_password_auto("Please enter passphrase for disk (verification):", "drive-harddisk", until, &password2)) < 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; } } else if (streq(argv[1], "detach")) { @@ -243,5 +358,12 @@ finish: if (cd) crypt_free(cd); + free(opt_cipher); + free(opt_hash); + + free(truncated_cipher); + + free(password); + return r; }