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Fix OpenSSL 3.0.x related issues. (#10291)

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* Drop obsolete initialization calls.
* Use decoder API for DH parameters.
* Enable auto DH parameters if not explicitly used, which should be the
  preferred configuration going forward.
This commit is contained in:
Yossi Gottlieb 2022-02-15 08:37:06 +02:00 committed by GitHub
parent e6478cfd10
commit 3881f7850f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 42 additions and 7 deletions
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4
redis.conf
View File

@ -213,7 +213,9 @@ tcp-keepalive 300
#
# tls-client-key-file-pass secret
# Configure a DH parameters file to enable Diffie-Hellman (DH) key exchange:
# Configure a DH parameters file to enable Diffie-Hellman (DH) key exchange,
# required by older versions of OpenSSL (<3.0). Newer versions do not require
# this configuration and recommend against it.
#
# tls-dh-params-file redis.dh

45
src/tls.c
View File

@ -39,6 +39,9 @@
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/pem.h>
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#include <openssl/decoder.h>
#endif
#define REDIS_TLS_PROTO_TLSv1 (1<<0)
#define REDIS_TLS_PROTO_TLSv1_1 (1<<1)
@ -146,14 +149,13 @@ void tlsInit(void) {
*/
#if OPENSSL_VERSION_NUMBER < 0x10100000L
OPENSSL_config(NULL);
SSL_load_error_strings();
SSL_library_init();
#elif OPENSSL_VERSION_NUMBER < 0x10101000L
OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL);
#else
OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG|OPENSSL_INIT_ATFORK, NULL);
#endif
ERR_load_crypto_strings();
SSL_load_error_strings();
SSL_library_init();
#ifdef USE_CRYPTO_LOCKS
initCryptoLocks();
@ -323,20 +325,46 @@ int tlsConfigure(redisTLSContextConfig *ctx_config) {
if (ctx_config->prefer_server_ciphers)
SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
#if defined(SSL_CTX_set_ecdh_auto)
#if ((OPENSSL_VERSION_NUMBER < 0x30000000L) && defined(SSL_CTX_set_ecdh_auto))
SSL_CTX_set_ecdh_auto(ctx, 1);
#endif
SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE);
if (ctx_config->dh_params_file) {
FILE *dhfile = fopen(ctx_config->dh_params_file, "r");
DH *dh = NULL;
if (!dhfile) {
serverLog(LL_WARNING, "Failed to load %s: %s", ctx_config->dh_params_file, strerror(errno));
goto error;
}
dh = PEM_read_DHparams(dhfile, NULL, NULL, NULL);
#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
EVP_PKEY *pkey = NULL;
OSSL_DECODER_CTX *dctx = OSSL_DECODER_CTX_new_for_pkey(
&pkey, "PEM", NULL, "DH", OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS, NULL, NULL);
if (!dctx) {
serverLog(LL_WARNING, "No decoder for DH params.");
fclose(dhfile);
goto error;
}
if (!OSSL_DECODER_from_fp(dctx, dhfile)) {
serverLog(LL_WARNING, "%s: failed to read DH params.", ctx_config->dh_params_file);
OSSL_DECODER_CTX_free(dctx);
fclose(dhfile);
goto error;
}
OSSL_DECODER_CTX_free(dctx);
fclose(dhfile);
if (SSL_CTX_set0_tmp_dh_pkey(ctx, pkey) <= 0) {
ERR_error_string_n(ERR_get_error(), errbuf, sizeof(errbuf));
serverLog(LL_WARNING, "Failed to load DH params file: %s: %s", ctx_config->dh_params_file, errbuf);
EVP_PKEY_free(pkey);
goto error;
}
/* Not freeing pkey, it is owned by OpenSSL now */
#else
DH *dh = PEM_read_DHparams(dhfile, NULL, NULL, NULL);
fclose(dhfile);
if (!dh) {
serverLog(LL_WARNING, "%s: failed to read DH params.", ctx_config->dh_params_file);
@ -351,6 +379,11 @@ int tlsConfigure(redisTLSContextConfig *ctx_config) {
}
DH_free(dh);
#endif
} else {
#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
SSL_CTX_set_dh_auto(ctx, 1);
#endif
}
/* If a client-side certificate is configured, create an explicit client context */