X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcryptsetup%2Fcryptsetup.c;h=3a2cfe459b16a619dab36fcd8e6c2105c256dda2;hp=347394db8ea802001e21e4daa5a86d48e52f96d3;hb=8cf3ca80680b43015971cbbf4625517ae859d50c;hpb=5f1dac6bf605871615b35891a3966fa474db5b20 diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c index 347394db8..3a2cfe459 100644 --- a/src/cryptsetup/cryptsetup.c +++ b/src/cryptsetup/cryptsetup.c @@ -27,6 +27,7 @@ #include #include +#include "fileio.h" #include "log.h" #include "util.h" #include "path-util.h" @@ -34,7 +35,7 @@ #include "ask-password-api.h" #include "def.h" -static const char *opt_type = NULL; /* LUKS1 or PLAIN */ +static const char *opt_type = NULL; /* CRYPT_LUKS1, CRYPT_TCRYPT or CRYPT_PLAIN */ static char *opt_cipher = NULL; static unsigned opt_key_size = 0; static unsigned opt_keyfile_size = 0; @@ -44,6 +45,9 @@ static unsigned opt_tries = 0; static bool opt_readonly = false; static bool opt_verify = false; static bool opt_discards = false; +static bool opt_tcrypt_hidden = false; +static bool opt_tcrypt_system = false; +static char **opt_tcrypt_keyfiles = NULL; static usec_t opt_timeout = 0; /* Options Debian's crypttab knows we don't: @@ -82,6 +86,14 @@ static int parse_one_option(const char *option) { return 0; } + } else if (startswith(option, "tcrypt-keyfile=")) { + + opt_type = CRYPT_TCRYPT; + if (path_is_absolute(option+15)) + opt_tcrypt_keyfiles = strv_append(opt_tcrypt_keyfiles, strdup(option+15)); + 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) { @@ -121,7 +133,15 @@ static int parse_one_option(const char *option) { opt_discards = true; else if (streq(option, "luks")) opt_type = CRYPT_LUKS1; - else if (streq(option, "plain") || + else if (streq(option, "tcrypt")) + opt_type = CRYPT_TCRYPT; + else if (streq(option, "tcrypt-hidden")) { + opt_type = CRYPT_TCRYPT; + opt_tcrypt_hidden = true; + } else if (streq(option, "tcrypt-system")) { + opt_type = CRYPT_TCRYPT; + opt_tcrypt_system = true; + } else if (streq(option, "plain") || streq(option, "swap") || streq(option, "tmp")) opt_type = CRYPT_PLAIN; @@ -215,7 +235,8 @@ finish: } static char *disk_mount_point(const char *label) { - char *mp = NULL, *device = NULL; + char *mp = NULL; + _cleanup_free_ char *device = NULL; FILE *f = NULL; struct mntent *m; @@ -238,11 +259,211 @@ finish: if (f) endmntent(f); - free(device); - return mp; } +static int get_password(const char *name, usec_t until, bool accept_cached, char ***passwords) { + int r; + char **p; + _cleanup_free_ char *text = NULL; + + assert(name); + assert(passwords); + + if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) + return log_oom(); + + r = ask_password_auto(text, "drive-harddisk", until, accept_cached, passwords); + if (r < 0) { + log_error("Failed to query password: %s", strerror(-r)); + return r; + } + + if (opt_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(); + + r = ask_password_auto(text, "drive-harddisk", until, false, &passwords2); + if (r < 0) { + log_error("Failed to query verification password: %s", strerror(-r)); + return r; + } + + 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 >= opt_key_size) + continue; + + /* Pad password if necessary */ + if (!(c = new(char, opt_key_size))) + return log_oom(); + + strncpy(c, *p, opt_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 **)opt_tcrypt_keyfiles, + .keyfiles_count = strv_length(opt_tcrypt_keyfiles) + }; + + assert(cd); + assert(name); + assert(key_file || passwords); + + if (opt_tcrypt_hidden) + params.flags |= CRYPT_TCRYPT_HIDDEN_HEADER; + + if (opt_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, + char **passwords, + uint32_t flags) { + int r = 0; + bool pass_volume_key = false; + + assert(cd); + assert(name); + assert(key_file || passwords); + + if (!opt_type || streq(opt_type, CRYPT_LUKS1)) + r = crypt_load(cd, CRYPT_LUKS1, NULL); + + if ((!opt_type && r < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) { + struct crypt_params_plain params = {}; + const char *cipher, *cipher_mode; + _cleanup_free_ char *truncated_cipher = NULL; + + if (opt_hash) { + /* plain isn't a real hash type. it just means "use no hash" */ + if (!streq(opt_hash, "plain")) + params.hash = opt_hash; + } else + params.hash = "ripemd160"; + + if (opt_cipher) { + size_t l; + + l = strcspn(opt_cipher, "-"); + truncated_cipher = strndup(opt_cipher, l); + if (!truncated_cipher) + return log_oom(); + + cipher = truncated_cipher; + cipher_mode = opt_cipher[l] ? opt_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 */ + 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. */ + r = crypt_format(cd, CRYPT_PLAIN, cipher, cipher_mode, + NULL, NULL, opt_keyfile_size, ¶ms); + + /* hash == NULL implies the user passed "plain" */ + pass_volume_key = (params.hash == NULL); + } + + if (r < 0) { + log_error("Loading of cryptographic parameters failed: %s", strerror(-r)); + return r; + } + + 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, CRYPT_ANY_SLOT, + key_file, opt_keyfile_size, + opt_keyfile_offset, flags); + if (r < 0) { + log_error("Failed to activate with key file '%s': %s", key_file, strerror(-r)); + return -EAGAIN; + } + } else { + char **p; + + STRV_FOREACH(p, passwords) { + if (pass_volume_key) + r = crypt_activate_by_volume_key(cd, name, *p, opt_key_size, flags); + else + r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, *p, strlen(*p), flags); + + if (r >= 0) + break; + } + } + + return r; +} + static int help(void) { printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n" @@ -257,9 +478,6 @@ static int help(void) { 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(); @@ -280,10 +498,11 @@ int main(int argc, char *argv[]) { if (streq(argv[1], "attach")) { uint32_t flags = 0; int k; - unsigned try; - const char *key_file = NULL; + 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] */ @@ -298,7 +517,7 @@ 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]; } @@ -359,181 +578,37 @@ int main(int argc, char *argv[]) { 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, "-"); - truncated_cipher = strndup(opt_cipher, l); - - if (!truncated_cipher) { - log_oom(); - goto finish; - } + if (key_file) { + struct stat st; - cipher = truncated_cipher; - cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain"; - } else { - cipher = "aes"; - cipher_mode = "cbc-essiv:sha256"; + /* 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 && (st.st_mode & 0005)) + log_warning("Key file %s is world-readable. This is not a good idea!", key_file); } - for (try = 0; try < opt_tries; try++) { - bool pass_volume_key = false; - - strv_free(passwords); - passwords = NULL; + for (tries = 0; tries < opt_tries; tries++) { + _cleanup_strv_free_ char **passwords = NULL; if (!key_file) { - char *text, **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 = { .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) { - 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 && (st.st_mode & 0005)) - log_warning("Key file %s is world-readable. That's certainly not a good idea.", key_file); - - k = crypt_activate_by_keyfile_offset( - cd, argv[2], CRYPT_ANY_SLOT, key_file, opt_keyfile_size, - opt_keyfile_offset, flags); - if (k < 0) { - log_error("Failed to activate with key file '%s': %s", key_file, strerror(-k)); - key_file = NULL; + k = get_password(name, until, tries == 0 && !opt_verify, &passwords); + if (k == -EAGAIN) continue; - } - } 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; - } + else if (k < 0) + goto finish; } + if (streq_ptr(opt_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; - - if (k != -EPERM) { + else if (k == -EAGAIN) { + key_file = NULL; + continue; + } else if (k != -EPERM) { log_error("Failed to activate: %s", strerror(-k)); goto finish; } @@ -541,8 +616,8 @@ int main(int argc, char *argv[]) { log_warning("Invalid passphrase."); } - if (try >= opt_tries) { - log_error("Too many attempts."); + if (tries >= opt_tries) { + log_error("Too many attempts; giving up."); r = EXIT_FAILURE; goto finish; } @@ -578,14 +653,7 @@ finish: free(opt_cipher); free(opt_hash); - - free(truncated_cipher); - - strv_free(passwords); - - free(description); - free(mount_point); - free(name_buffer); + strv_free(opt_tcrypt_keyfiles); return r; }