diff options
Diffstat (limited to 'src/cryptsetup')
-rw-r--r-- | src/cryptsetup/cryptsetup-fido2.c | 277 | ||||
-rw-r--r-- | src/cryptsetup/cryptsetup-fido2.h | 88 | ||||
-rw-r--r-- | src/cryptsetup/meson.build | 5 |
3 files changed, 0 insertions, 370 deletions
diff --git a/src/cryptsetup/cryptsetup-fido2.c b/src/cryptsetup/cryptsetup-fido2.c deleted file mode 100644 index a3bdedba1d..0000000000 --- a/src/cryptsetup/cryptsetup-fido2.c +++ /dev/null @@ -1,277 +0,0 @@ -/* SPDX-License-Identifier: LGPL-2.1-or-later */ - -#include "ask-password-api.h" -#include "cryptsetup-fido2.h" -#include "env-util.h" -#include "fileio.h" -#include "hexdecoct.h" -#include "json.h" -#include "libfido2-util.h" -#include "parse-util.h" -#include "random-util.h" -#include "strv.h" - -int acquire_fido2_key( - const char *volume_name, - const char *friendly_name, - const char *device, - const char *rp_id, - const void *cid, - size_t cid_size, - const char *key_file, - size_t key_file_size, - uint64_t key_file_offset, - const void *key_data, - size_t key_data_size, - usec_t until, - bool headless, - Fido2EnrollFlags required, - void **ret_decrypted_key, - size_t *ret_decrypted_key_size, - AskPasswordFlags ask_password_flags) { - - _cleanup_(erase_and_freep) char *envpw = NULL; - _cleanup_strv_free_erase_ char **pins = NULL; - _cleanup_free_ void *loaded_salt = NULL; - bool device_exists = false; - const char *salt; - size_t salt_size; - int r; - - if ((required & (FIDO2ENROLL_PIN | FIDO2ENROLL_UP | FIDO2ENROLL_UV)) && headless) - return log_error_errno(SYNTHETIC_ERRNO(ENOPKG), - "Local verification is required to unlock this volume, but the 'headless' parameter was set."); - - ask_password_flags |= ASK_PASSWORD_PUSH_CACHE | ASK_PASSWORD_ACCEPT_CACHED; - - assert(cid); - assert(key_file || key_data); - - if (key_data) { - salt = key_data; - salt_size = key_data_size; - } else { - _cleanup_free_ char *bindname = NULL; - - /* If we read the salt via AF_UNIX, make this client recognizable */ - if (asprintf(&bindname, "@%" PRIx64"/cryptsetup-fido2/%s", random_u64(), volume_name) < 0) - return log_oom(); - - r = read_full_file_full( - AT_FDCWD, key_file, - key_file_offset == 0 ? UINT64_MAX : key_file_offset, - key_file_size == 0 ? SIZE_MAX : key_file_size, - READ_FULL_FILE_CONNECT_SOCKET, - bindname, - (char**) &loaded_salt, &salt_size); - if (r < 0) - return r; - - salt = loaded_salt; - } - - r = getenv_steal_erase("PIN", &envpw); - if (r < 0) - return log_error_errno(r, "Failed to acquire password from environment: %m"); - if (r > 0) { - pins = strv_new(envpw); - if (!pins) - return log_oom(); - } - - for (;;) { - if (!device_exists) { - /* Before we inquire for the PIN we'll need, if we never talked to the device, check - * if the device actually is plugged in. Otherwise we'll ask for the PIN already when - * the device is not plugged in, which is confusing. */ - - r = fido2_have_device(device); - if (r < 0) - return r; - if (r == 0) /* no device found, return EAGAIN so that caller will wait/watch udev */ - return -EAGAIN; - - device_exists = true; /* now we know for sure, a device exists, no need to ask again */ - } - - /* Always make an attempt before asking for PIN. - * fido2_use_hmac_hash() will perform a pre-flight check for whether the credential for - * can be found on one of the connected devices. This way, we can avoid prompting the user - * for a PIN when we are sure that no device can be used. */ - r = fido2_use_hmac_hash( - device, - rp_id ?: "io.systemd.cryptsetup", - salt, salt_size, - cid, cid_size, - pins, - required, - ret_decrypted_key, - ret_decrypted_key_size); - if (!IN_SET(r, - -ENOANO, /* needs pin */ - -ENOLCK)) /* pin incorrect */ - return r; - - device_exists = true; /* that a PIN is needed/wasn't correct means that we managed to - * talk to a device */ - - if (headless) - return log_error_errno(SYNTHETIC_ERRNO(ENOPKG), "PIN querying disabled via 'headless' option. Use the '$PIN' environment variable."); - - pins = strv_free_erase(pins); - r = ask_password_auto("Please enter security token PIN:", "drive-harddisk", NULL, "fido2-pin", "cryptsetup.fido2-pin", until, ask_password_flags, &pins); - if (r < 0) - return log_error_errno(r, "Failed to ask for user password: %m"); - - ask_password_flags &= ~ASK_PASSWORD_ACCEPT_CACHED; - } -} - -int acquire_fido2_key_auto( - struct crypt_device *cd, - const char *name, - const char *friendly_name, - const char *fido2_device, - const char *key_file, - size_t key_file_size, - uint64_t key_file_offset, - usec_t until, - bool headless, - void **ret_decrypted_key, - size_t *ret_decrypted_key_size, - AskPasswordFlags ask_password_flags) { - - _cleanup_free_ void *cid = NULL; - size_t cid_size = 0; - int r, ret = -ENOENT; - Fido2EnrollFlags required = 0; - - assert(cd); - assert(name); - assert(ret_decrypted_key); - assert(ret_decrypted_key_size); - - /* Loads FIDO2 metadata from LUKS2 JSON token headers. */ - - for (int token = 0; token < sym_crypt_token_max(CRYPT_LUKS2); token ++) { - _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; - JsonVariant *w; - _cleanup_free_ void *salt = NULL; - _cleanup_free_ char *rp = NULL; - size_t salt_size = 0; - int ks; - - r = cryptsetup_get_token_as_json(cd, token, "systemd-fido2", &v); - if (IN_SET(r, -ENOENT, -EINVAL, -EMEDIUMTYPE)) - continue; - if (r < 0) - return log_error_errno(r, "Failed to read JSON token data off disk: %m"); - - ks = cryptsetup_get_keyslot_from_token(v); - if (ks < 0) { - /* Handle parsing errors of the keyslots field gracefully, since it's not 'owned' by - * us, but by the LUKS2 spec */ - log_warning_errno(ks, "Failed to extract keyslot index from FIDO2 JSON data token %i, skipping: %m", token); - continue; - } - - w = json_variant_by_key(v, "fido2-credential"); - if (!w || !json_variant_is_string(w)) - return log_error_errno(SYNTHETIC_ERRNO(EINVAL), - "FIDO2 token data lacks 'fido2-credential' field."); - - r = unbase64mem(json_variant_string(w), SIZE_MAX, &cid, &cid_size); - if (r < 0) - return log_error_errno(SYNTHETIC_ERRNO(EINVAL), - "Invalid base64 data in 'fido2-credential' field."); - - w = json_variant_by_key(v, "fido2-salt"); - if (!w || !json_variant_is_string(w)) - return log_error_errno(SYNTHETIC_ERRNO(EINVAL), - "FIDO2 token data lacks 'fido2-salt' field."); - - assert(!salt); - assert(salt_size == 0); - r = unbase64mem(json_variant_string(w), SIZE_MAX, &salt, &salt_size); - if (r < 0) - return log_error_errno(r, "Failed to decode base64 encoded salt."); - - w = json_variant_by_key(v, "fido2-rp"); - if (w) { - /* The "rp" field is optional. */ - - if (!json_variant_is_string(w)) - return log_error_errno(SYNTHETIC_ERRNO(EINVAL), - "FIDO2 token data's 'fido2-rp' field is not a string."); - - assert(!rp); - rp = strdup(json_variant_string(w)); - if (!rp) - return log_oom(); - } - - w = json_variant_by_key(v, "fido2-clientPin-required"); - if (w) { - /* The "fido2-clientPin-required" field is optional. */ - - if (!json_variant_is_boolean(w)) - return log_error_errno(SYNTHETIC_ERRNO(EINVAL), - "FIDO2 token data's 'fido2-clientPin-required' field is not a boolean."); - - SET_FLAG(required, FIDO2ENROLL_PIN, json_variant_boolean(w)); - } else - required |= FIDO2ENROLL_PIN_IF_NEEDED; /* compat with 248, where the field was unset */ - - w = json_variant_by_key(v, "fido2-up-required"); - if (w) { - /* The "fido2-up-required" field is optional. */ - - if (!json_variant_is_boolean(w)) - return log_error_errno(SYNTHETIC_ERRNO(EINVAL), - "FIDO2 token data's 'fido2-up-required' field is not a boolean."); - - SET_FLAG(required, FIDO2ENROLL_UP, json_variant_boolean(w)); - } else - required |= FIDO2ENROLL_UP_IF_NEEDED; /* compat with 248 */ - - w = json_variant_by_key(v, "fido2-uv-required"); - if (w) { - /* The "fido2-uv-required" field is optional. */ - - if (!json_variant_is_boolean(w)) - return log_error_errno(SYNTHETIC_ERRNO(EINVAL), - "FIDO2 token data's 'fido2-uv-required' field is not a boolean."); - - SET_FLAG(required, FIDO2ENROLL_UV, json_variant_boolean(w)); - } else - required |= FIDO2ENROLL_UV_OMIT; /* compat with 248 */ - - ret = acquire_fido2_key( - name, - friendly_name, - fido2_device, - rp, - cid, cid_size, - key_file, key_file_size, key_file_offset, - salt, salt_size, - until, - headless, - required, - ret_decrypted_key, ret_decrypted_key_size, - ask_password_flags); - if (ret == 0) - break; - } - - if (!cid) - return log_error_errno(SYNTHETIC_ERRNO(ENXIO), - "No valid FIDO2 token data found."); - - if (ret == -EAGAIN) /* fido2 device does not exist, or UV is blocked; caller will prompt for retry */ - return log_debug_errno(ret, "FIDO2 token does not exist, or UV is blocked."); - if (ret < 0) - return log_error_errno(ret, "Failed to unlock LUKS volume with FIDO2 token: %m"); - - log_info("Unlocked volume via automatically discovered security FIDO2 token."); - return ret; -} diff --git a/src/cryptsetup/cryptsetup-fido2.h b/src/cryptsetup/cryptsetup-fido2.h deleted file mode 100644 index 371bf21f0e..0000000000 --- a/src/cryptsetup/cryptsetup-fido2.h +++ /dev/null @@ -1,88 +0,0 @@ -/* SPDX-License-Identifier: LGPL-2.1-or-later */ -#pragma once - -#include <sys/types.h> - -#include "cryptsetup-util.h" -#include "libfido2-util.h" -#include "log.h" -#include "time-util.h" - -#if HAVE_LIBFIDO2 - -int acquire_fido2_key( - const char *volume_name, - const char *friendly_name, - const char *device, - const char *rp_id, - const void *cid, - size_t cid_size, - const char *key_file, - size_t key_file_size, - uint64_t key_file_offset, - const void *key_data, - size_t key_data_size, - usec_t until, - bool headless, - Fido2EnrollFlags required, - void **ret_decrypted_key, - size_t *ret_decrypted_key_size, - AskPasswordFlags ask_password_flags); - -int acquire_fido2_key_auto( - struct crypt_device *cd, - const char *name, - const char *friendly_name, - const char *fido2_device, - const char *key_file, - size_t key_file_size, - uint64_t key_file_offset, - usec_t until, - bool headless, - void **ret_decrypted_key, - size_t *ret_decrypted_key_size, - AskPasswordFlags ask_password_flags); - -#else - -static inline int acquire_fido2_key( - const char *volume_name, - const char *friendly_name, - const char *device, - const char *rp_id, - const void *cid, - size_t cid_size, - const char *key_file, - size_t key_file_size, - uint64_t key_file_offset, - const void *key_data, - size_t key_data_size, - usec_t until, - bool headless, - Fido2EnrollFlags required, - void **ret_decrypted_key, - size_t *ret_decrypted_key_size, - AskPasswordFlags ask_password_flags) { - - return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), - "FIDO2 token support not available."); -} - -static inline int acquire_fido2_key_auto( - struct crypt_device *cd, - const char *name, - const char *friendly_name, - const char *fido2_device, - const char *key_file, - size_t key_file_size, - uint64_t key_file_offset, - usec_t until, - bool headless, - void **ret_decrypted_key, - size_t *ret_decrypted_key_size, - AskPasswordFlags ask_password_flags) { - - return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), - "FIDO2 token support not available."); -} -#endif diff --git a/src/cryptsetup/meson.build b/src/cryptsetup/meson.build index 26267fba51..ba8e01a198 100644 --- a/src/cryptsetup/meson.build +++ b/src/cryptsetup/meson.build @@ -1,7 +1,6 @@ # SPDX-License-Identifier: LGPL-2.1-or-later systemd_cryptsetup_sources = files( - 'cryptsetup-fido2.h', 'cryptsetup-keyfile.c', 'cryptsetup-keyfile.h', 'cryptsetup-pkcs11.h', @@ -12,10 +11,6 @@ if conf.get('HAVE_P11KIT') == 1 systemd_cryptsetup_sources += files('cryptsetup-pkcs11.c') endif -if conf.get('HAVE_LIBFIDO2') == 1 - systemd_cryptsetup_sources += files('cryptsetup-fido2.c') -endif - if conf.get('HAVE_TPM2') == 1 systemd_cryptsetup_sources += files('cryptsetup-tpm2.c') endif |