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/* ssl_init.c Common OpenSSL initialization code
* This is needed for crypto as well as NTS
*/
#include "config.h"
#include "ntp_stdlib.h"
#include "ntp.h"
#include <stdbool.h>
#include <openssl/ssl.h>
#include <openssl/evp.h>
#include "hack-ancient-openssl.h"
#if OPENSSL_VERSION_NUMBER > 0x20000000L
#include <openssl/params.h>
#include <openssl/err.h>
#else
#include <openssl/cmac.h>
#endif
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
static void atexit_ssl_cleanup(void);
#endif
static bool ssl_init_done;
EVP_MD_CTX *digest_ctx;
#if OPENSSL_VERSION_NUMBER > 0x20000000L
EVP_MAC_CTX *evp_ctx;
#else
CMAC_CTX *cmac_ctx;
#endif
void
ssl_init(void)
{
unsigned char dummy;
if (ssl_init_done) {
return;
}
#ifndef DISABLE_NTS
OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS|OPENSSL_INIT_LOAD_CRYPTO_STRINGS|OPENSSL_INIT_ADD_ALL_CIPHERS|OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
#endif
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
OpenSSL_add_all_digests();
OpenSSL_add_all_ciphers();
atexit(&atexit_ssl_cleanup);
#endif
/* More initialization help for seccomp */
/* RAND_poll in OpenSSL on Raspbian needs get{u,g,eu,eg}id() */
ntp_RAND_bytes(&dummy, 1);
digest_ctx = EVP_MD_CTX_new();
#if OPENSSL_VERSION_NUMBER > 0x20000000L
{
EVP_MAC *mac = EVP_MAC_fetch(NULL, "cmac", NULL);
if (NULL == mac) {
msyslog(LOG_ERR, "ssl_init: EVP_MAC_fetch failed");
exit(1);
}
evp_ctx = EVP_MAC_CTX_new(mac);
if (NULL == evp_ctx) {
msyslog(LOG_ERR, "ssl_init: EVP_MAC_CTX_new failed");
exit(1);
}
// EVP_MAC_free(mac);
}
/* Barf: EVP_MAC_CTX_dup doesn't work until src gets cipher and key */
{
EVP_MAC_CTX *ctx;
OSSL_PARAM params[3];
char key[16];
char copy[100]; /* OSSL_PARAM vs const */
ctx = EVP_MAC_CTX_dup(evp_ctx);
if (NULL != ctx ) {
/* Was failing: 2023-feb-20, OpenSSL 3.0.8 */
unsigned long err = ERR_get_error();
char * str = ERR_error_string(err, NULL);
msyslog(LOG_ERR, "ssl_init: first dup worked: %s", str);
}
strlcpy(copy, "AES-128-CBC", sizeof(copy));
params[0] = OSSL_PARAM_construct_utf8_string("cipher", copy, 0);
params[1] = OSSL_PARAM_construct_octet_string("key", key, 16);
params[2] = OSSL_PARAM_construct_end();
if (0 == EVP_MAC_CTX_set_params(evp_ctx, params)) {
unsigned long err = ERR_get_error();
char * str = ERR_error_string(err, NULL);
msyslog(LOG_ERR, "ssl_init: EVP_MAC_CTX_set_params() failed: %s", str);
}
ctx = EVP_MAC_CTX_dup(evp_ctx);
if (NULL == ctx ) {
unsigned long err = ERR_get_error();
char * str = ERR_error_string(err, NULL);
msyslog(LOG_ERR, "ssl_init: second dup failed: %s", str);
}
}
#else
cmac_ctx = CMAC_CTX_new();
#endif
ssl_init_done = true;
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
static void
atexit_ssl_cleanup(void)
{
if (!ssl_init_done)
return;
ssl_init_done = false;
EVP_cleanup();
}
#endif
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