| /* |
| * QEMU crypto secret support |
| * |
| * Copyright (c) 2015 Red Hat, Inc. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "crypto/secret.h" |
| #include "crypto/cipher.h" |
| #include "qapi/error.h" |
| #include "qom/object_interfaces.h" |
| #include "qemu/base64.h" |
| #include "qemu/module.h" |
| #include "trace.h" |
| |
| |
| static void |
| qcrypto_secret_load_data(QCryptoSecret *secret, |
| uint8_t **output, |
| size_t *outputlen, |
| Error **errp) |
| { |
| char *data = NULL; |
| size_t length = 0; |
| GError *gerr = NULL; |
| |
| *output = NULL; |
| *outputlen = 0; |
| |
| if (secret->file) { |
| if (secret->data) { |
| error_setg(errp, |
| "'file' and 'data' are mutually exclusive"); |
| return; |
| } |
| if (!g_file_get_contents(secret->file, &data, &length, &gerr)) { |
| error_setg(errp, |
| "Unable to read %s: %s", |
| secret->file, gerr->message); |
| g_error_free(gerr); |
| return; |
| } |
| *output = (uint8_t *)data; |
| *outputlen = length; |
| } else if (secret->data) { |
| *outputlen = strlen(secret->data); |
| *output = (uint8_t *)g_strdup(secret->data); |
| } else { |
| error_setg(errp, "Either 'file' or 'data' must be provided"); |
| } |
| } |
| |
| |
| static void qcrypto_secret_decrypt(QCryptoSecret *secret, |
| const uint8_t *input, |
| size_t inputlen, |
| uint8_t **output, |
| size_t *outputlen, |
| Error **errp) |
| { |
| uint8_t *key = NULL, *ciphertext = NULL, *iv = NULL; |
| size_t keylen, ciphertextlen, ivlen; |
| QCryptoCipher *aes = NULL; |
| uint8_t *plaintext = NULL; |
| |
| *output = NULL; |
| *outputlen = 0; |
| |
| if (qcrypto_secret_lookup(secret->keyid, |
| &key, &keylen, |
| errp) < 0) { |
| goto cleanup; |
| } |
| |
| if (keylen != 32) { |
| error_setg(errp, "Key should be 32 bytes in length"); |
| goto cleanup; |
| } |
| |
| if (!secret->iv) { |
| error_setg(errp, "IV is required to decrypt secret"); |
| goto cleanup; |
| } |
| |
| iv = qbase64_decode(secret->iv, -1, &ivlen, errp); |
| if (!iv) { |
| goto cleanup; |
| } |
| if (ivlen != 16) { |
| error_setg(errp, "IV should be 16 bytes in length not %zu", |
| ivlen); |
| goto cleanup; |
| } |
| |
| aes = qcrypto_cipher_new(QCRYPTO_CIPHER_ALG_AES_256, |
| QCRYPTO_CIPHER_MODE_CBC, |
| key, keylen, |
| errp); |
| if (!aes) { |
| goto cleanup; |
| } |
| |
| if (qcrypto_cipher_setiv(aes, iv, ivlen, errp) < 0) { |
| goto cleanup; |
| } |
| |
| if (secret->format == QCRYPTO_SECRET_FORMAT_BASE64) { |
| ciphertext = qbase64_decode((const gchar*)input, |
| inputlen, |
| &ciphertextlen, |
| errp); |
| if (!ciphertext) { |
| goto cleanup; |
| } |
| plaintext = g_new0(uint8_t, ciphertextlen + 1); |
| } else { |
| ciphertextlen = inputlen; |
| plaintext = g_new0(uint8_t, inputlen + 1); |
| } |
| if (qcrypto_cipher_decrypt(aes, |
| ciphertext ? ciphertext : input, |
| plaintext, |
| ciphertextlen, |
| errp) < 0) { |
| plaintext = NULL; |
| goto cleanup; |
| } |
| |
| if (plaintext[ciphertextlen - 1] > 16 || |
| plaintext[ciphertextlen - 1] > ciphertextlen) { |
| error_setg(errp, "Incorrect number of padding bytes (%d) " |
| "found on decrypted data", |
| (int)plaintext[ciphertextlen - 1]); |
| g_free(plaintext); |
| plaintext = NULL; |
| goto cleanup; |
| } |
| |
| /* Even though plaintext may contain arbitrary NUL |
| * ensure it is explicitly NUL terminated. |
| */ |
| ciphertextlen -= plaintext[ciphertextlen - 1]; |
| plaintext[ciphertextlen] = '\0'; |
| |
| *output = plaintext; |
| *outputlen = ciphertextlen; |
| |
| cleanup: |
| g_free(ciphertext); |
| g_free(iv); |
| g_free(key); |
| qcrypto_cipher_free(aes); |
| } |
| |
| |
| static void qcrypto_secret_decode(const uint8_t *input, |
| size_t inputlen, |
| uint8_t **output, |
| size_t *outputlen, |
| Error **errp) |
| { |
| *output = qbase64_decode((const gchar*)input, |
| inputlen, |
| outputlen, |
| errp); |
| } |
| |
| |
| static void |
| qcrypto_secret_prop_set_loaded(Object *obj, |
| bool value, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| |
| if (value) { |
| Error *local_err = NULL; |
| uint8_t *input = NULL; |
| size_t inputlen = 0; |
| uint8_t *output = NULL; |
| size_t outputlen = 0; |
| |
| qcrypto_secret_load_data(secret, &input, &inputlen, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| |
| if (secret->keyid) { |
| qcrypto_secret_decrypt(secret, input, inputlen, |
| &output, &outputlen, &local_err); |
| g_free(input); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| input = output; |
| inputlen = outputlen; |
| } else { |
| if (secret->format != QCRYPTO_SECRET_FORMAT_RAW) { |
| qcrypto_secret_decode(input, inputlen, |
| &output, &outputlen, &local_err); |
| g_free(input); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| input = output; |
| inputlen = outputlen; |
| } |
| } |
| |
| secret->rawdata = input; |
| secret->rawlen = inputlen; |
| } else { |
| g_free(secret->rawdata); |
| secret->rawlen = 0; |
| } |
| } |
| |
| |
| static bool |
| qcrypto_secret_prop_get_loaded(Object *obj, |
| Error **errp G_GNUC_UNUSED) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| return secret->data != NULL; |
| } |
| |
| |
| static void |
| qcrypto_secret_prop_set_format(Object *obj, |
| int value, |
| Error **errp G_GNUC_UNUSED) |
| { |
| QCryptoSecret *creds = QCRYPTO_SECRET(obj); |
| |
| creds->format = value; |
| } |
| |
| |
| static int |
| qcrypto_secret_prop_get_format(Object *obj, |
| Error **errp G_GNUC_UNUSED) |
| { |
| QCryptoSecret *creds = QCRYPTO_SECRET(obj); |
| |
| return creds->format; |
| } |
| |
| |
| static void |
| qcrypto_secret_prop_set_data(Object *obj, |
| const char *value, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| |
| g_free(secret->data); |
| secret->data = g_strdup(value); |
| } |
| |
| |
| static char * |
| qcrypto_secret_prop_get_data(Object *obj, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| return g_strdup(secret->data); |
| } |
| |
| |
| static void |
| qcrypto_secret_prop_set_file(Object *obj, |
| const char *value, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| |
| g_free(secret->file); |
| secret->file = g_strdup(value); |
| } |
| |
| |
| static char * |
| qcrypto_secret_prop_get_file(Object *obj, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| return g_strdup(secret->file); |
| } |
| |
| |
| static void |
| qcrypto_secret_prop_set_iv(Object *obj, |
| const char *value, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| |
| g_free(secret->iv); |
| secret->iv = g_strdup(value); |
| } |
| |
| |
| static char * |
| qcrypto_secret_prop_get_iv(Object *obj, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| return g_strdup(secret->iv); |
| } |
| |
| |
| static void |
| qcrypto_secret_prop_set_keyid(Object *obj, |
| const char *value, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| |
| g_free(secret->keyid); |
| secret->keyid = g_strdup(value); |
| } |
| |
| |
| static char * |
| qcrypto_secret_prop_get_keyid(Object *obj, |
| Error **errp) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| return g_strdup(secret->keyid); |
| } |
| |
| |
| static void |
| qcrypto_secret_complete(UserCreatable *uc, Error **errp) |
| { |
| object_property_set_bool(OBJECT(uc), true, "loaded", errp); |
| } |
| |
| |
| static void |
| qcrypto_secret_finalize(Object *obj) |
| { |
| QCryptoSecret *secret = QCRYPTO_SECRET(obj); |
| |
| g_free(secret->iv); |
| g_free(secret->file); |
| g_free(secret->keyid); |
| g_free(secret->rawdata); |
| g_free(secret->data); |
| } |
| |
| static void |
| qcrypto_secret_class_init(ObjectClass *oc, void *data) |
| { |
| UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); |
| |
| ucc->complete = qcrypto_secret_complete; |
| |
| object_class_property_add_bool(oc, "loaded", |
| qcrypto_secret_prop_get_loaded, |
| qcrypto_secret_prop_set_loaded, |
| NULL); |
| object_class_property_add_enum(oc, "format", |
| "QCryptoSecretFormat", |
| &QCryptoSecretFormat_lookup, |
| qcrypto_secret_prop_get_format, |
| qcrypto_secret_prop_set_format, |
| NULL); |
| object_class_property_add_str(oc, "data", |
| qcrypto_secret_prop_get_data, |
| qcrypto_secret_prop_set_data, |
| NULL); |
| object_class_property_add_str(oc, "file", |
| qcrypto_secret_prop_get_file, |
| qcrypto_secret_prop_set_file, |
| NULL); |
| object_class_property_add_str(oc, "keyid", |
| qcrypto_secret_prop_get_keyid, |
| qcrypto_secret_prop_set_keyid, |
| NULL); |
| object_class_property_add_str(oc, "iv", |
| qcrypto_secret_prop_get_iv, |
| qcrypto_secret_prop_set_iv, |
| NULL); |
| } |
| |
| |
| int qcrypto_secret_lookup(const char *secretid, |
| uint8_t **data, |
| size_t *datalen, |
| Error **errp) |
| { |
| Object *obj; |
| QCryptoSecret *secret; |
| |
| obj = object_resolve_path_component( |
| object_get_objects_root(), secretid); |
| if (!obj) { |
| error_setg(errp, "No secret with id '%s'", secretid); |
| return -1; |
| } |
| |
| secret = (QCryptoSecret *) |
| object_dynamic_cast(obj, |
| TYPE_QCRYPTO_SECRET); |
| if (!secret) { |
| error_setg(errp, "Object with id '%s' is not a secret", |
| secretid); |
| return -1; |
| } |
| |
| if (!secret->rawdata) { |
| error_setg(errp, "Secret with id '%s' has no data", |
| secretid); |
| return -1; |
| } |
| |
| *data = g_new0(uint8_t, secret->rawlen + 1); |
| memcpy(*data, secret->rawdata, secret->rawlen); |
| (*data)[secret->rawlen] = '\0'; |
| *datalen = secret->rawlen; |
| |
| return 0; |
| } |
| |
| |
| char *qcrypto_secret_lookup_as_utf8(const char *secretid, |
| Error **errp) |
| { |
| uint8_t *data; |
| size_t datalen; |
| |
| if (qcrypto_secret_lookup(secretid, |
| &data, |
| &datalen, |
| errp) < 0) { |
| return NULL; |
| } |
| |
| if (!g_utf8_validate((const gchar*)data, datalen, NULL)) { |
| error_setg(errp, |
| "Data from secret %s is not valid UTF-8", |
| secretid); |
| g_free(data); |
| return NULL; |
| } |
| |
| return (char *)data; |
| } |
| |
| |
| char *qcrypto_secret_lookup_as_base64(const char *secretid, |
| Error **errp) |
| { |
| uint8_t *data; |
| size_t datalen; |
| char *ret; |
| |
| if (qcrypto_secret_lookup(secretid, |
| &data, |
| &datalen, |
| errp) < 0) { |
| return NULL; |
| } |
| |
| ret = g_base64_encode(data, datalen); |
| g_free(data); |
| return ret; |
| } |
| |
| |
| static const TypeInfo qcrypto_secret_info = { |
| .parent = TYPE_OBJECT, |
| .name = TYPE_QCRYPTO_SECRET, |
| .instance_size = sizeof(QCryptoSecret), |
| .instance_finalize = qcrypto_secret_finalize, |
| .class_size = sizeof(QCryptoSecretClass), |
| .class_init = qcrypto_secret_class_init, |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_USER_CREATABLE }, |
| { } |
| } |
| }; |
| |
| |
| static void |
| qcrypto_secret_register_types(void) |
| { |
| type_register_static(&qcrypto_secret_info); |
| } |
| |
| |
| type_init(qcrypto_secret_register_types); |