| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include "errno-util.h" |
| #include "format-table.h" |
| #include "hexdecoct.h" |
| #include "homectl-pkcs11.h" |
| #include "libcrypt-util.h" |
| #include "memory-util.h" |
| #include "openssl-util.h" |
| #include "pkcs11-util.h" |
| #include "random-util.h" |
| #include "strv.h" |
| |
| static int add_pkcs11_encrypted_key( |
| JsonVariant **v, |
| const char *uri, |
| const void *encrypted_key, size_t encrypted_key_size, |
| const void *decrypted_key, size_t decrypted_key_size) { |
| |
| _cleanup_(json_variant_unrefp) JsonVariant *l = NULL, *w = NULL, *e = NULL; |
| _cleanup_(erase_and_freep) char *base64_encoded = NULL, *hashed = NULL; |
| int r; |
| |
| assert(v); |
| assert(uri); |
| assert(encrypted_key); |
| assert(encrypted_key_size > 0); |
| assert(decrypted_key); |
| assert(decrypted_key_size > 0); |
| |
| /* 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(decrypted_key, decrypted_key_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("uri", JSON_BUILD_STRING(uri)), |
| JSON_BUILD_PAIR("data", JSON_BUILD_BASE64(encrypted_key, encrypted_key_size)), |
| JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRING(hashed)))); |
| if (r < 0) |
| return log_error_errno(r, "Failed to build encrypted JSON key object: %m"); |
| |
| w = json_variant_ref(json_variant_by_key(*v, "privileged")); |
| l = json_variant_ref(json_variant_by_key(w, "pkcs11EncryptedKey")); |
| |
| r = json_variant_append_array(&l, e); |
| if (r < 0) |
| return log_error_errno(r, "Failed append PKCS#11 encrypted key: %m"); |
| |
| r = json_variant_set_field(&w, "pkcs11EncryptedKey", l); |
| if (r < 0) |
| return log_error_errno(r, "Failed to set PKCS#11 encrypted key: %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; |
| } |
| |
| static int add_pkcs11_token_uri(JsonVariant **v, const char *uri) { |
| _cleanup_(json_variant_unrefp) JsonVariant *w = NULL; |
| _cleanup_strv_free_ char **l = NULL; |
| int r; |
| |
| assert(v); |
| assert(uri); |
| |
| w = json_variant_ref(json_variant_by_key(*v, "pkcs11TokenUri")); |
| if (w) { |
| r = json_variant_strv(w, &l); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse PKCS#11 token list: %m"); |
| |
| if (strv_contains(l, uri)) |
| return 0; |
| } |
| |
| r = strv_extend(&l, uri); |
| 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 PKCS#11 token URI JSON: %m"); |
| |
| r = json_variant_set_field(v, "pkcs11TokenUri", w); |
| if (r < 0) |
| return log_error_errno(r, "Failed to update PKCS#11 token URI list: %m"); |
| |
| return 0; |
| } |
| |
| int identity_add_token_pin(JsonVariant **v, const char *pin) { |
| _cleanup_(json_variant_unrefp) JsonVariant *w = NULL, *l = NULL; |
| _cleanup_(strv_free_erasep) char **pins = NULL; |
| int r; |
| |
| assert(v); |
| |
| if (isempty(pin)) |
| return 0; |
| |
| w = json_variant_ref(json_variant_by_key(*v, "secret")); |
| l = json_variant_ref(json_variant_by_key(w, "tokenPin")); |
| |
| r = json_variant_strv(l, &pins); |
| if (r < 0) |
| return log_error_errno(r, "Failed to convert PIN array: %m"); |
| |
| if (strv_find(pins, pin)) |
| return 0; |
| |
| r = strv_extend(&pins, pin); |
| if (r < 0) |
| return log_oom(); |
| |
| strv_uniq(pins); |
| |
| l = json_variant_unref(l); |
| |
| r = json_variant_new_array_strv(&l, pins); |
| if (r < 0) |
| return log_error_errno(r, "Failed to allocate new PIN array JSON: %m"); |
| |
| json_variant_sensitive(l); |
| |
| r = json_variant_set_field(&w, "tokenPin", l); |
| if (r < 0) |
| return log_error_errno(r, "Failed to update PIN field: %m"); |
| |
| r = json_variant_set_field(v, "secret", w); |
| if (r < 0) |
| return log_error_errno(r, "Failed to update secret object: %m"); |
| |
| return 1; |
| } |
| |
| static int acquire_pkcs11_certificate( |
| const char *uri, |
| const char *askpw_friendly_name, |
| const char *askpw_icon_name, |
| X509 **ret_cert, |
| char **ret_pin_used) { |
| #if HAVE_P11KIT |
| return pkcs11_acquire_certificate(uri, askpw_friendly_name, askpw_icon_name, ret_cert, ret_pin_used); |
| #else |
| return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), |
| "PKCS#11 tokens not supported on this build."); |
| #endif |
| } |
| |
| int identity_add_pkcs11_key_data(JsonVariant **v, const char *uri) { |
| _cleanup_(erase_and_freep) void *decrypted_key = NULL, *encrypted_key = NULL; |
| _cleanup_(erase_and_freep) char *pin = NULL; |
| size_t decrypted_key_size, encrypted_key_size; |
| _cleanup_(X509_freep) X509 *cert = NULL; |
| EVP_PKEY *pkey; |
| int r; |
| |
| assert(v); |
| |
| r = acquire_pkcs11_certificate(uri, "home directory operation", "user-home", &cert, &pin); |
| if (r < 0) |
| return r; |
| |
| pkey = X509_get0_pubkey(cert); |
| if (!pkey) |
| return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to extract public key from X.509 certificate."); |
| |
| r = rsa_pkey_to_suitable_key_size(pkey, &decrypted_key_size); |
| if (r < 0) |
| return log_error_errno(r, "Failed to extract RSA key size from X509 certificate."); |
| |
| log_debug("Generating %zu bytes random key.", decrypted_key_size); |
| |
| decrypted_key = malloc(decrypted_key_size); |
| if (!decrypted_key) |
| return log_oom(); |
| |
| r = genuine_random_bytes(decrypted_key, decrypted_key_size, RANDOM_BLOCK); |
| if (r < 0) |
| return log_error_errno(r, "Failed to generate random key: %m"); |
| |
| r = rsa_encrypt_bytes(pkey, decrypted_key, decrypted_key_size, &encrypted_key, &encrypted_key_size); |
| if (r < 0) |
| return log_error_errno(r, "Failed to encrypt key: %m"); |
| |
| /* Add the token URI to the public part of the record. */ |
| r = add_pkcs11_token_uri(v, uri); |
| if (r < 0) |
| return r; |
| |
| /* Include the encrypted version of the random key we just generated in the privileged part of the record */ |
| r = add_pkcs11_encrypted_key( |
| v, |
| uri, |
| encrypted_key, encrypted_key_size, |
| decrypted_key, decrypted_key_size); |
| 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, pin); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
