510 lines
14 KiB
C
510 lines
14 KiB
C
/*
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* QEMU crypto secret support
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "crypto/secret.h"
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#include "crypto/cipher.h"
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#include "qapi/error.h"
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#include "qom/object_interfaces.h"
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#include "qemu/base64.h"
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#include "trace.h"
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static void
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qcrypto_secret_load_data(QCryptoSecret *secret,
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uint8_t **output,
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size_t *outputlen,
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Error **errp)
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{
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char *data = NULL;
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size_t length = 0;
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GError *gerr = NULL;
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*output = NULL;
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*outputlen = 0;
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if (secret->file) {
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if (secret->data) {
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error_setg(errp,
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"'file' and 'data' are mutually exclusive");
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return;
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}
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if (!g_file_get_contents(secret->file, &data, &length, &gerr)) {
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error_setg(errp,
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"Unable to read %s: %s",
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secret->file, gerr->message);
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g_error_free(gerr);
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return;
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}
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*output = (uint8_t *)data;
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*outputlen = length;
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} else if (secret->data) {
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*outputlen = strlen(secret->data);
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*output = (uint8_t *)g_strdup(secret->data);
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} else {
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error_setg(errp, "Either 'file' or 'data' must be provided");
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}
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}
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static void qcrypto_secret_decrypt(QCryptoSecret *secret,
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const uint8_t *input,
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size_t inputlen,
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uint8_t **output,
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size_t *outputlen,
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Error **errp)
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{
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uint8_t *key = NULL, *ciphertext = NULL, *iv = NULL;
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size_t keylen, ciphertextlen, ivlen;
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QCryptoCipher *aes = NULL;
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uint8_t *plaintext = NULL;
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*output = NULL;
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*outputlen = 0;
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if (qcrypto_secret_lookup(secret->keyid,
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&key, &keylen,
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errp) < 0) {
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goto cleanup;
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}
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if (keylen != 32) {
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error_setg(errp, "Key should be 32 bytes in length");
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goto cleanup;
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}
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if (!secret->iv) {
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error_setg(errp, "IV is required to decrypt secret");
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goto cleanup;
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}
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iv = qbase64_decode(secret->iv, -1, &ivlen, errp);
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if (!iv) {
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goto cleanup;
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}
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if (ivlen != 16) {
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error_setg(errp, "IV should be 16 bytes in length not %zu",
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ivlen);
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goto cleanup;
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}
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aes = qcrypto_cipher_new(QCRYPTO_CIPHER_ALG_AES_256,
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QCRYPTO_CIPHER_MODE_CBC,
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key, keylen,
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errp);
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if (!aes) {
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goto cleanup;
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}
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if (qcrypto_cipher_setiv(aes, iv, ivlen, errp) < 0) {
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goto cleanup;
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}
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if (secret->format == QCRYPTO_SECRET_FORMAT_BASE64) {
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ciphertext = qbase64_decode((const gchar*)input,
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inputlen,
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&ciphertextlen,
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errp);
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if (!ciphertext) {
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goto cleanup;
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}
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plaintext = g_new0(uint8_t, ciphertextlen + 1);
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} else {
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ciphertextlen = inputlen;
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plaintext = g_new0(uint8_t, inputlen + 1);
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}
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if (qcrypto_cipher_decrypt(aes,
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ciphertext ? ciphertext : input,
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plaintext,
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ciphertextlen,
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errp) < 0) {
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plaintext = NULL;
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goto cleanup;
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}
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if (plaintext[ciphertextlen - 1] > 16 ||
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plaintext[ciphertextlen - 1] > ciphertextlen) {
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error_setg(errp, "Incorrect number of padding bytes (%d) "
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"found on decrypted data",
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(int)plaintext[ciphertextlen - 1]);
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g_free(plaintext);
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plaintext = NULL;
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goto cleanup;
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}
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/* Even though plaintext may contain arbitrary NUL
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* ensure it is explicitly NUL terminated.
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*/
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ciphertextlen -= plaintext[ciphertextlen - 1];
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plaintext[ciphertextlen] = '\0';
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*output = plaintext;
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*outputlen = ciphertextlen;
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cleanup:
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g_free(ciphertext);
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g_free(iv);
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g_free(key);
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qcrypto_cipher_free(aes);
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}
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static void qcrypto_secret_decode(const uint8_t *input,
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size_t inputlen,
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uint8_t **output,
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size_t *outputlen,
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Error **errp)
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{
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*output = qbase64_decode((const gchar*)input,
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inputlen,
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outputlen,
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errp);
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}
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static void
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qcrypto_secret_prop_set_loaded(Object *obj,
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bool value,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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if (value) {
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Error *local_err = NULL;
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uint8_t *input = NULL;
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size_t inputlen = 0;
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uint8_t *output = NULL;
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size_t outputlen = 0;
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qcrypto_secret_load_data(secret, &input, &inputlen, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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if (secret->keyid) {
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qcrypto_secret_decrypt(secret, input, inputlen,
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&output, &outputlen, &local_err);
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g_free(input);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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input = output;
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inputlen = outputlen;
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} else {
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if (secret->format != QCRYPTO_SECRET_FORMAT_RAW) {
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qcrypto_secret_decode(input, inputlen,
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&output, &outputlen, &local_err);
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g_free(input);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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input = output;
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inputlen = outputlen;
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}
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}
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secret->rawdata = input;
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secret->rawlen = inputlen;
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} else {
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g_free(secret->rawdata);
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secret->rawlen = 0;
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}
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}
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static bool
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qcrypto_secret_prop_get_loaded(Object *obj,
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Error **errp G_GNUC_UNUSED)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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return secret->data != NULL;
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}
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static void
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qcrypto_secret_prop_set_format(Object *obj,
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int value,
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Error **errp G_GNUC_UNUSED)
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{
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QCryptoSecret *creds = QCRYPTO_SECRET(obj);
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creds->format = value;
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}
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static int
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qcrypto_secret_prop_get_format(Object *obj,
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Error **errp G_GNUC_UNUSED)
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{
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QCryptoSecret *creds = QCRYPTO_SECRET(obj);
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return creds->format;
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}
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static void
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qcrypto_secret_prop_set_data(Object *obj,
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const char *value,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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g_free(secret->data);
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secret->data = g_strdup(value);
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}
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static char *
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qcrypto_secret_prop_get_data(Object *obj,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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return g_strdup(secret->data);
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}
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static void
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qcrypto_secret_prop_set_file(Object *obj,
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const char *value,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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g_free(secret->file);
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secret->file = g_strdup(value);
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}
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static char *
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qcrypto_secret_prop_get_file(Object *obj,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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return g_strdup(secret->file);
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}
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static void
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qcrypto_secret_prop_set_iv(Object *obj,
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const char *value,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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g_free(secret->iv);
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secret->iv = g_strdup(value);
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}
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static char *
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qcrypto_secret_prop_get_iv(Object *obj,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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return g_strdup(secret->iv);
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}
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static void
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qcrypto_secret_prop_set_keyid(Object *obj,
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const char *value,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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g_free(secret->keyid);
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secret->keyid = g_strdup(value);
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}
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static char *
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qcrypto_secret_prop_get_keyid(Object *obj,
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Error **errp)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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return g_strdup(secret->keyid);
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}
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static void
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qcrypto_secret_complete(UserCreatable *uc, Error **errp)
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{
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object_property_set_bool(OBJECT(uc), true, "loaded", errp);
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}
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static void
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qcrypto_secret_finalize(Object *obj)
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{
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QCryptoSecret *secret = QCRYPTO_SECRET(obj);
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g_free(secret->iv);
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g_free(secret->file);
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g_free(secret->keyid);
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g_free(secret->rawdata);
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g_free(secret->data);
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}
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static void
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qcrypto_secret_class_init(ObjectClass *oc, void *data)
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{
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UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
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ucc->complete = qcrypto_secret_complete;
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object_class_property_add_bool(oc, "loaded",
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qcrypto_secret_prop_get_loaded,
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qcrypto_secret_prop_set_loaded,
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NULL);
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object_class_property_add_enum(oc, "format",
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"QCryptoSecretFormat",
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QCryptoSecretFormat_lookup,
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qcrypto_secret_prop_get_format,
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qcrypto_secret_prop_set_format,
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NULL);
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object_class_property_add_str(oc, "data",
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qcrypto_secret_prop_get_data,
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qcrypto_secret_prop_set_data,
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NULL);
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object_class_property_add_str(oc, "file",
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qcrypto_secret_prop_get_file,
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qcrypto_secret_prop_set_file,
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NULL);
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object_class_property_add_str(oc, "keyid",
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qcrypto_secret_prop_get_keyid,
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qcrypto_secret_prop_set_keyid,
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NULL);
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object_class_property_add_str(oc, "iv",
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qcrypto_secret_prop_get_iv,
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qcrypto_secret_prop_set_iv,
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NULL);
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}
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int qcrypto_secret_lookup(const char *secretid,
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uint8_t **data,
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size_t *datalen,
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Error **errp)
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{
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Object *obj;
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QCryptoSecret *secret;
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obj = object_resolve_path_component(
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object_get_objects_root(), secretid);
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if (!obj) {
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error_setg(errp, "No secret with id '%s'", secretid);
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return -1;
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}
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secret = (QCryptoSecret *)
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object_dynamic_cast(obj,
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TYPE_QCRYPTO_SECRET);
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if (!secret) {
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error_setg(errp, "Object with id '%s' is not a secret",
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secretid);
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return -1;
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}
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if (!secret->rawdata) {
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error_setg(errp, "Secret with id '%s' has no data",
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secretid);
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return -1;
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}
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*data = g_new0(uint8_t, secret->rawlen + 1);
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memcpy(*data, secret->rawdata, secret->rawlen);
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(*data)[secret->rawlen] = '\0';
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*datalen = secret->rawlen;
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return 0;
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}
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char *qcrypto_secret_lookup_as_utf8(const char *secretid,
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Error **errp)
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{
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uint8_t *data;
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size_t datalen;
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if (qcrypto_secret_lookup(secretid,
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&data,
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&datalen,
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errp) < 0) {
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return NULL;
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}
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if (!g_utf8_validate((const gchar*)data, datalen, NULL)) {
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error_setg(errp,
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"Data from secret %s is not valid UTF-8",
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secretid);
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g_free(data);
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return NULL;
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}
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return (char *)data;
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}
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char *qcrypto_secret_lookup_as_base64(const char *secretid,
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Error **errp)
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{
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uint8_t *data;
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size_t datalen;
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char *ret;
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if (qcrypto_secret_lookup(secretid,
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&data,
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&datalen,
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errp) < 0) {
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return NULL;
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}
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ret = g_base64_encode(data, datalen);
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g_free(data);
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return ret;
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}
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static const TypeInfo qcrypto_secret_info = {
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.parent = TYPE_OBJECT,
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.name = TYPE_QCRYPTO_SECRET,
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.instance_size = sizeof(QCryptoSecret),
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.instance_finalize = qcrypto_secret_finalize,
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.class_size = sizeof(QCryptoSecretClass),
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.class_init = qcrypto_secret_class_init,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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static void
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qcrypto_secret_register_types(void)
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{
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type_register_static(&qcrypto_secret_info);
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}
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type_init(qcrypto_secret_register_types);
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