| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #if HAVE_LIBFIDO2 |
| #include <fido.h> |
| #endif |
| |
| #include "ask-password-api.h" |
| #include "errno-util.h" |
| #include "format-table.h" |
| #include "hexdecoct.h" |
| #include "homectl-fido2.h" |
| #include "homectl-pkcs11.h" |
| #include "libcrypt-util.h" |
| #include "libfido2-util.h" |
| #include "locale-util.h" |
| #include "memory-util.h" |
| #include "random-util.h" |
| #include "strv.h" |
| |
| #if HAVE_LIBFIDO2 |
| static int add_fido2_credential_id( |
| JsonVariant **v, |
| const void *cid, |
| size_t cid_size) { |
| |
| _cleanup_(json_variant_unrefp) JsonVariant *w = NULL; |
| _cleanup_strv_free_ char **l = NULL; |
| _cleanup_free_ char *escaped = NULL; |
| int r; |
| |
| assert(v); |
| assert(cid); |
| |
| r = base64mem(cid, cid_size, &escaped); |
| if (r < 0) |
| return log_error_errno(r, "Failed to base64 encode FIDO2 credential ID: %m"); |
| |
| w = json_variant_ref(json_variant_by_key(*v, "fido2HmacCredential")); |
| if (w) { |
| r = json_variant_strv(w, &l); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse FIDO2 credential ID list: %m"); |
| |
| if (strv_contains(l, escaped)) |
| return 0; |
| } |
| |
| r = strv_extend(&l, escaped); |
| if (r < 0) |
| return log_oom(); |
| |
| w = json_variant_unref(w); |
| r = json_variant_new_array_strv(&w, l); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create FIDO2 credential ID JSON: %m"); |
| |
| r = json_variant_set_field(v, "fido2HmacCredential", w); |
| if (r < 0) |
| return log_error_errno(r, "Failed to update FIDO2 credential ID: %m"); |
| |
| return 0; |
| } |
| |
| static int add_fido2_salt( |
| JsonVariant **v, |
| const void *cid, |
| size_t cid_size, |
| const void *fido2_salt, |
| size_t fido2_salt_size, |
| const void *secret, |
| size_t secret_size, |
| Fido2EnrollFlags lock_with) { |
| |
| _cleanup_(json_variant_unrefp) JsonVariant *l = NULL, *w = NULL, *e = NULL; |
| _cleanup_(erase_and_freep) char *base64_encoded = NULL, *hashed = NULL; |
| int r; |
| |
| /* Before using UNIX hashing on the supplied key we base64 encode it, since crypt_r() and friends |
| * expect a NUL terminated string, and we use a binary key */ |
| r = base64mem(secret, secret_size, &base64_encoded); |
| if (r < 0) |
| return log_error_errno(r, "Failed to base64 encode secret key: %m"); |
| |
| r = hash_password(base64_encoded, &hashed); |
| if (r < 0) |
| return log_error_errno(errno_or_else(EINVAL), "Failed to UNIX hash secret key: %m"); |
| |
| r = json_build(&e, JSON_BUILD_OBJECT( |
| JSON_BUILD_PAIR("credential", JSON_BUILD_BASE64(cid, cid_size)), |
| JSON_BUILD_PAIR("salt", JSON_BUILD_BASE64(fido2_salt, fido2_salt_size)), |
| JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRING(hashed)), |
| JSON_BUILD_PAIR("up", JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_UP))), |
| JSON_BUILD_PAIR("uv", JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_UV))), |
| JSON_BUILD_PAIR("clientPin", JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_PIN))))); |
| |
| if (r < 0) |
| return log_error_errno(r, "Failed to build FIDO2 salt JSON key object: %m"); |
| |
| w = json_variant_ref(json_variant_by_key(*v, "privileged")); |
| l = json_variant_ref(json_variant_by_key(w, "fido2HmacSalt")); |
| |
| r = json_variant_append_array(&l, e); |
| if (r < 0) |
| return log_error_errno(r, "Failed append FIDO2 salt: %m"); |
| |
| r = json_variant_set_field(&w, "fido2HmacSalt", l); |
| if (r < 0) |
| return log_error_errno(r, "Failed to set FDO2 salt: %m"); |
| |
| r = json_variant_set_field(v, "privileged", w); |
| if (r < 0) |
| return log_error_errno(r, "Failed to update privileged field: %m"); |
| |
| return 0; |
| } |
| #endif |
| |
| int identity_add_fido2_parameters( |
| JsonVariant **v, |
| const char *device, |
| Fido2EnrollFlags lock_with) { |
| |
| #if HAVE_LIBFIDO2 |
| JsonVariant *un, *realm, *rn; |
| _cleanup_(erase_and_freep) void *secret = NULL, *salt = NULL; |
| _cleanup_(erase_and_freep) char *used_pin = NULL; |
| size_t cid_size, salt_size, secret_size; |
| _cleanup_free_ void *cid = NULL; |
| const char *fido_un; |
| int r; |
| |
| assert(v); |
| assert(device); |
| |
| un = json_variant_by_key(*v, "userName"); |
| if (!un) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "userName field of user record is missing"); |
| if (!json_variant_is_string(un)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "userName field of user record is not a string"); |
| |
| realm = json_variant_by_key(*v, "realm"); |
| if (realm) { |
| if (!json_variant_is_string(realm)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "realm field of user record is not a string"); |
| |
| fido_un = strjoina(json_variant_string(un), json_variant_string(realm)); |
| } else |
| fido_un = json_variant_string(un); |
| |
| rn = json_variant_by_key(*v, "realName"); |
| if (rn && !json_variant_is_string(rn)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "realName field of user record is not a string"); |
| |
| r = fido2_generate_hmac_hash( |
| device, |
| /* rp_id= */ "io.systemd.home", |
| /* rp_name= */ "Home Directory", |
| /* user_id= */ fido_un, strlen(fido_un), /* We pass the user ID and name as the same */ |
| /* user_name= */ fido_un, |
| /* user_display_name= */ rn ? json_variant_string(rn) : NULL, |
| /* user_icon_name= */ NULL, |
| /* askpw_icon_name= */ "user-home", |
| lock_with, |
| &cid, &cid_size, |
| &salt, &salt_size, |
| &secret, &secret_size, |
| &used_pin, |
| &lock_with); |
| if (r < 0) |
| return r; |
| |
| r = add_fido2_credential_id( |
| v, |
| cid, |
| cid_size); |
| if (r < 0) |
| return r; |
| |
| r = add_fido2_salt( |
| v, |
| cid, |
| cid_size, |
| salt, |
| salt_size, |
| secret, |
| secret_size, |
| lock_with); |
| if (r < 0) |
| return r; |
| |
| /* If we acquired the PIN also include it in the secret section of the record, so that systemd-homed |
| * can use it if it needs to, given that it likely needs to decrypt the key again to pass to LUKS or |
| * fscrypt. */ |
| r = identity_add_token_pin(v, used_pin); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| #else |
| return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), |
| "FIDO2 tokens not supported on this build."); |
| #endif |
| } |
