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diff --git a/libknet/crypto_openssl.c b/libknet/crypto_openssl.c
index fe3684a4..6332287d 100644
--- a/libknet/crypto_openssl.c
+++ b/libknet/crypto_openssl.c
@@ -1,595 +1,607 @@
/*
* Copyright (C) 2017-2020 Red Hat, Inc. All rights reserved.
*
* Author: Fabio M. Di Nitto <fabbione@kronosnet.org>
*
* This software licensed under LGPL-2.0+
*/
#define KNET_MODULE
#include "config.h"
+/*
+ * allow to build with openssl 3.0 that has deprecated
+ * use of direct access to HMAC API.
+ *
+ * knet will require some heavy rewrite to port to 3.0,
+ * but it clashes with the re-key feature branch.
+ *
+ * use path of less resistance for now, then we will
+ * port at a later stage.
+ */
+#define OPENSSL_API_COMPAT 0x1010000L
+
#include <string.h>
#include <errno.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include "logging.h"
#include "crypto_model.h"
/*
* 1.0.2 requires at least 120 bytes
* 1.1.0 requires at least 256 bytes
*/
#define SSLERR_BUF_SIZE 512
/*
* crypto definitions and conversion tables
*/
#define SALT_SIZE 16
struct opensslcrypto_instance {
void *private_key;
int private_key_len;
const EVP_CIPHER *crypto_cipher_type;
const EVP_MD *crypto_hash_type;
};
static int openssl_is_init = 0;
/*
* crypt/decrypt functions openssl1.0
*/
#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
static int encrypt_openssl(
knet_handle_t knet_h,
const struct iovec *iov,
int iovcnt,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
struct opensslcrypto_instance *instance = knet_h->crypto_instance->model_instance;
EVP_CIPHER_CTX ctx;
int tmplen = 0, offset = 0;
unsigned char *salt = buf_out;
unsigned char *data = buf_out + SALT_SIZE;
int err = 0;
int i;
char sslerr[SSLERR_BUF_SIZE];
EVP_CIPHER_CTX_init(&ctx);
if (!RAND_bytes(salt, SALT_SIZE)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to get random salt data: %s", sslerr);
err = -1;
goto out;
}
/*
* add warning re keylength
*/
EVP_EncryptInit_ex(&ctx, instance->crypto_cipher_type, NULL, instance->private_key, salt);
for (i=0; i<iovcnt; i++) {
if (!EVP_EncryptUpdate(&ctx,
data + offset, &tmplen,
(unsigned char *)iov[i].iov_base, iov[i].iov_len)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to encrypt: %s", sslerr);
err = -1;
goto out;
}
offset = offset + tmplen;
}
if (!EVP_EncryptFinal_ex(&ctx, data + offset, &tmplen)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to finalize encrypt: %s", sslerr);
err = -1;
goto out;
}
*buf_out_len = offset + tmplen + SALT_SIZE;
out:
EVP_CIPHER_CTX_cleanup(&ctx);
return err;
}
static int decrypt_openssl (
knet_handle_t knet_h,
const unsigned char *buf_in,
const ssize_t buf_in_len,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
struct opensslcrypto_instance *instance = knet_h->crypto_instance->model_instance;
EVP_CIPHER_CTX ctx;
int tmplen1 = 0, tmplen2 = 0;
unsigned char *salt = (unsigned char *)buf_in;
unsigned char *data = salt + SALT_SIZE;
int datalen = buf_in_len - SALT_SIZE;
int err = 0;
char sslerr[SSLERR_BUF_SIZE];
EVP_CIPHER_CTX_init(&ctx);
/*
* add warning re keylength
*/
EVP_DecryptInit_ex(&ctx, instance->crypto_cipher_type, NULL, instance->private_key, salt);
if (!EVP_DecryptUpdate(&ctx, buf_out, &tmplen1, data, datalen)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to decrypt: %s", sslerr);
err = -1;
goto out;
}
if (!EVP_DecryptFinal_ex(&ctx, buf_out + tmplen1, &tmplen2)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to finalize decrypt: %s", sslerr);
err = -1;
goto out;
}
*buf_out_len = tmplen1 + tmplen2;
out:
EVP_CIPHER_CTX_cleanup(&ctx);
return err;
}
#else /* (OPENSSL_VERSION_NUMBER < 0x10100000L) */
static int encrypt_openssl(
knet_handle_t knet_h,
const struct iovec *iov,
int iovcnt,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
struct opensslcrypto_instance *instance = knet_h->crypto_instance->model_instance;
EVP_CIPHER_CTX *ctx;
int tmplen = 0, offset = 0;
unsigned char *salt = buf_out;
unsigned char *data = buf_out + SALT_SIZE;
int err = 0;
int i;
char sslerr[SSLERR_BUF_SIZE];
ctx = EVP_CIPHER_CTX_new();
if (!RAND_bytes(salt, SALT_SIZE)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to get random salt data: %s", sslerr);
err = -1;
goto out;
}
/*
* add warning re keylength
*/
EVP_EncryptInit_ex(ctx, instance->crypto_cipher_type, NULL, instance->private_key, salt);
for (i=0; i<iovcnt; i++) {
if (!EVP_EncryptUpdate(ctx,
data + offset, &tmplen,
(unsigned char *)iov[i].iov_base, iov[i].iov_len)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to encrypt: %s", sslerr);
err = -1;
goto out;
}
offset = offset + tmplen;
}
if (!EVP_EncryptFinal_ex(ctx, data + offset, &tmplen)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to finalize encrypt: %s", sslerr);
err = -1;
goto out;
}
*buf_out_len = offset + tmplen + SALT_SIZE;
out:
EVP_CIPHER_CTX_free(ctx);
return err;
}
static int decrypt_openssl (
knet_handle_t knet_h,
const unsigned char *buf_in,
const ssize_t buf_in_len,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
struct opensslcrypto_instance *instance = knet_h->crypto_instance->model_instance;
EVP_CIPHER_CTX *ctx = NULL;
int tmplen1 = 0, tmplen2 = 0;
unsigned char *salt = (unsigned char *)buf_in;
unsigned char *data = salt + SALT_SIZE;
int datalen = buf_in_len - SALT_SIZE;
int err = 0;
char sslerr[SSLERR_BUF_SIZE];
if (datalen <= 0) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Packet is too short");
err = -1;
goto out;
}
ctx = EVP_CIPHER_CTX_new();
/*
* add warning re keylength
*/
EVP_DecryptInit_ex(ctx, instance->crypto_cipher_type, NULL, instance->private_key, salt);
if (!EVP_DecryptUpdate(ctx, buf_out, &tmplen1, data, datalen)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to decrypt: %s", sslerr);
err = -1;
goto out;
}
if (!EVP_DecryptFinal_ex(ctx, buf_out + tmplen1, &tmplen2)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to finalize decrypt: %s", sslerr);
err = -1;
goto out;
}
*buf_out_len = tmplen1 + tmplen2;
out:
if (ctx) {
EVP_CIPHER_CTX_free(ctx);
}
return err;
}
#endif
/*
* hash/hmac/digest functions
*/
static int calculate_openssl_hash(
knet_handle_t knet_h,
const unsigned char *buf,
const size_t buf_len,
unsigned char *hash)
{
struct opensslcrypto_instance *instance = knet_h->crypto_instance->model_instance;
unsigned int hash_len = 0;
unsigned char *hash_out = NULL;
char sslerr[SSLERR_BUF_SIZE];
hash_out = HMAC(instance->crypto_hash_type,
instance->private_key, instance->private_key_len,
buf, buf_len,
hash, &hash_len);
if ((!hash_out) || (hash_len != knet_h->sec_hash_size)) {
ERR_error_string_n(ERR_get_error(), sslerr, sizeof(sslerr));
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to calculate hash: %s", sslerr);
return -1;
}
return 0;
}
/*
* exported API
*/
static int opensslcrypto_encrypt_and_signv (
knet_handle_t knet_h,
const struct iovec *iov_in,
int iovcnt_in,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
struct opensslcrypto_instance *instance = knet_h->crypto_instance->model_instance;
int i;
if (instance->crypto_cipher_type) {
if (encrypt_openssl(knet_h, iov_in, iovcnt_in, buf_out, buf_out_len) < 0) {
return -1;
}
} else {
*buf_out_len = 0;
for (i=0; i<iovcnt_in; i++) {
memmove(buf_out + *buf_out_len, iov_in[i].iov_base, iov_in[i].iov_len);
*buf_out_len = *buf_out_len + iov_in[i].iov_len;
}
}
if (instance->crypto_hash_type) {
if (calculate_openssl_hash(knet_h, buf_out, *buf_out_len, buf_out + *buf_out_len) < 0) {
return -1;
}
*buf_out_len = *buf_out_len + knet_h->sec_hash_size;
}
return 0;
}
static int opensslcrypto_encrypt_and_sign (
knet_handle_t knet_h,
const unsigned char *buf_in,
const ssize_t buf_in_len,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
struct iovec iov_in;
memset(&iov_in, 0, sizeof(iov_in));
iov_in.iov_base = (unsigned char *)buf_in;
iov_in.iov_len = buf_in_len;
return opensslcrypto_encrypt_and_signv(knet_h, &iov_in, 1, buf_out, buf_out_len);
}
static int opensslcrypto_authenticate_and_decrypt (
knet_handle_t knet_h,
const unsigned char *buf_in,
const ssize_t buf_in_len,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
struct opensslcrypto_instance *instance = knet_h->crypto_instance->model_instance;
ssize_t temp_len = buf_in_len;
if (instance->crypto_hash_type) {
unsigned char tmp_hash[knet_h->sec_hash_size];
ssize_t temp_buf_len = buf_in_len - knet_h->sec_hash_size;
if ((temp_buf_len <= 0) || (temp_buf_len > KNET_MAX_PACKET_SIZE)) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Incorrect packet size.");
return -1;
}
if (calculate_openssl_hash(knet_h, buf_in, temp_buf_len, tmp_hash) < 0) {
return -1;
}
if (memcmp(tmp_hash, buf_in + temp_buf_len, knet_h->sec_hash_size) != 0) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Digest does not match");
return -1;
}
temp_len = temp_len - knet_h->sec_hash_size;
*buf_out_len = temp_len;
}
if (instance->crypto_cipher_type) {
if (decrypt_openssl(knet_h, buf_in, temp_len, buf_out, buf_out_len) < 0) {
return -1;
}
} else {
memmove(buf_out, buf_in, temp_len);
*buf_out_len = temp_len;
}
return 0;
}
#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
static pthread_mutex_t *openssl_internal_lock;
static void openssl_internal_locking_callback(int mode, int type, char *file, int line)
{
if (mode & CRYPTO_LOCK) {
(void)pthread_mutex_lock(&(openssl_internal_lock[type]));
} else {
pthread_mutex_unlock(&(openssl_internal_lock[type]));
}
}
static pthread_t openssl_internal_thread_id(void)
{
return pthread_self();
}
static void openssl_internal_lock_cleanup(void)
{
int i;
CRYPTO_set_locking_callback(NULL);
CRYPTO_set_id_callback(NULL);
for (i = 0; i < CRYPTO_num_locks(); i++) {
pthread_mutex_destroy(&(openssl_internal_lock[i]));
}
if (openssl_internal_lock) {
free(openssl_internal_lock);
}
return;
}
static void openssl_atexit_handler(void)
{
openssl_internal_lock_cleanup();
}
static int openssl_internal_lock_setup(void)
{
int savederrno = 0, err = 0;
int i;
openssl_internal_lock = malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t));
if (!openssl_internal_lock) {
savederrno = errno;
err = -1;
goto out;
}
for (i = 0; i < CRYPTO_num_locks(); i++) {
savederrno = pthread_mutex_init(&(openssl_internal_lock[i]), NULL);
if (savederrno) {
err = -1;
goto out;
}
}
CRYPTO_set_id_callback((void *)openssl_internal_thread_id);
CRYPTO_set_locking_callback((void *)&openssl_internal_locking_callback);
if (atexit(openssl_atexit_handler)) {
err = -1;
}
out:
if (err) {
openssl_internal_lock_cleanup();
}
errno = savederrno;
return err;
}
#endif
static void opensslcrypto_fini(
knet_handle_t knet_h,
struct crypto_instance *crypto_instance)
{
struct opensslcrypto_instance *opensslcrypto_instance = crypto_instance->model_instance;
if (opensslcrypto_instance) {
if (opensslcrypto_instance->private_key) {
free(opensslcrypto_instance->private_key);
opensslcrypto_instance->private_key = NULL;
}
free(opensslcrypto_instance);
crypto_instance->model_instance = NULL;
}
#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
ERR_free_strings();
#endif
return;
}
static int opensslcrypto_init(
knet_handle_t knet_h,
struct crypto_instance *crypto_instance,
struct knet_handle_crypto_cfg *knet_handle_crypto_cfg)
{
struct opensslcrypto_instance *opensslcrypto_instance = NULL;
int savederrno;
log_debug(knet_h, KNET_SUB_OPENSSLCRYPTO,
"Initizializing openssl crypto module [%s/%s]",
knet_handle_crypto_cfg->crypto_cipher_type,
knet_handle_crypto_cfg->crypto_hash_type);
if (!openssl_is_init) {
#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
ERR_load_crypto_strings();
OPENSSL_add_all_algorithms_noconf();
if (openssl_internal_lock_setup() < 0) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to init openssl");
errno = EAGAIN;
return -1;
}
#else
if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS \
| OPENSSL_INIT_ADD_ALL_DIGESTS, NULL)) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to init openssl");
errno = EAGAIN;
return -1;
}
#endif
openssl_is_init = 1;
}
crypto_instance->model_instance = malloc(sizeof(struct opensslcrypto_instance));
if (!crypto_instance->model_instance) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to allocate memory for openssl model instance");
errno = ENOMEM;
return -1;
}
opensslcrypto_instance = crypto_instance->model_instance;
memset(opensslcrypto_instance, 0, sizeof(struct opensslcrypto_instance));
if (strcmp(knet_handle_crypto_cfg->crypto_cipher_type, "none") == 0) {
opensslcrypto_instance->crypto_cipher_type = NULL;
} else {
opensslcrypto_instance->crypto_cipher_type = EVP_get_cipherbyname(knet_handle_crypto_cfg->crypto_cipher_type);
if (!opensslcrypto_instance->crypto_cipher_type) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "unknown crypto cipher type requested");
savederrno = ENXIO;
goto out_err;
}
}
if (strcmp(knet_handle_crypto_cfg->crypto_hash_type, "none") == 0) {
opensslcrypto_instance->crypto_hash_type = NULL;
} else {
opensslcrypto_instance->crypto_hash_type = EVP_get_digestbyname(knet_handle_crypto_cfg->crypto_hash_type);
if (!opensslcrypto_instance->crypto_hash_type) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "unknown crypto hash type requested");
savederrno = ENXIO;
goto out_err;
}
}
if ((opensslcrypto_instance->crypto_cipher_type) &&
(!opensslcrypto_instance->crypto_hash_type)) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "crypto communication requires hash specified");
savederrno = EINVAL;
goto out_err;
}
opensslcrypto_instance->private_key = malloc(knet_handle_crypto_cfg->private_key_len);
if (!opensslcrypto_instance->private_key) {
log_err(knet_h, KNET_SUB_OPENSSLCRYPTO, "Unable to allocate memory for openssl private key");
savederrno = ENOMEM;
goto out_err;
}
memmove(opensslcrypto_instance->private_key, knet_handle_crypto_cfg->private_key, knet_handle_crypto_cfg->private_key_len);
opensslcrypto_instance->private_key_len = knet_handle_crypto_cfg->private_key_len;
if (opensslcrypto_instance->crypto_hash_type) {
crypto_instance->sec_hash_size = EVP_MD_size(opensslcrypto_instance->crypto_hash_type);
}
if (opensslcrypto_instance->crypto_cipher_type) {
size_t block_size;
block_size = EVP_CIPHER_block_size(opensslcrypto_instance->crypto_cipher_type);
crypto_instance->sec_salt_size = SALT_SIZE;
crypto_instance->sec_block_size = block_size;
}
return 0;
out_err:
opensslcrypto_fini(knet_h, crypto_instance);
errno = savederrno;
return -1;
}
crypto_ops_t crypto_model = {
KNET_CRYPTO_MODEL_ABI,
opensslcrypto_init,
opensslcrypto_fini,
opensslcrypto_encrypt_and_sign,
opensslcrypto_encrypt_and_signv,
opensslcrypto_authenticate_and_decrypt
};

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