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ssl_engine_init.c
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ssl_engine_init.c
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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* _ _
* _ __ ___ ___ __| | ___ ___| | mod_ssl
* | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
* | | | | | | (_) | (_| | \__ \__ \ |
* |_| |_| |_|\___/ \__,_|___|___/___/_|
* |_____|
* ssl_engine_init.c
* Initialization of Servers
*/
/* ``Recursive, adj.;
see Recursive.''
-- Unknown */
#include "ssl_private.h"
#include "mod_ssl.h"
#include "mod_ssl_openssl.h"
#include "mpm_common.h"
#include "mod_md.h"
static apr_status_t ssl_init_ca_cert_path(server_rec *, apr_pool_t *, const char *,
STACK_OF(X509_NAME) *, STACK_OF(X509_INFO) *);
APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, init_server,
(server_rec *s,apr_pool_t *p,int is_proxy,SSL_CTX *ctx),
(s,p,is_proxy,ctx), OK, DECLINED)
/* _________________________________________________________________
**
** Module Initialization
** _________________________________________________________________
*/
#ifdef HAVE_ECC
#define KEYTYPES "RSA, DSA or ECC"
#else
#define KEYTYPES "RSA or DSA"
#endif
#if MODSSL_USE_OPENSSL_PRE_1_1_API && (!defined(LIBRESSL_VERSION_NUMBER) || \
LIBRESSL_VERSION_NUMBER < 0x2070000f)
/* OpenSSL Pre-1.1.0 compatibility */
/* Taken from OpenSSL 1.1.0 snapshot 20160410 */
static int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
/* q is optional */
if (p == NULL || g == NULL)
return 0;
BN_free(dh->p);
BN_free(dh->q);
BN_free(dh->g);
dh->p = p;
dh->q = q;
dh->g = g;
if (q != NULL) {
dh->length = BN_num_bits(q);
}
return 1;
}
#endif
/*
* Grab well-defined DH parameters from OpenSSL, see the BN_get_rfc*
* functions in <openssl/bn.h> for all available primes.
*/
static DH *make_dh_params(BIGNUM *(*prime)(BIGNUM *))
{
DH *dh = DH_new();
BIGNUM *p, *g;
if (!dh) {
return NULL;
}
p = prime(NULL);
g = BN_new();
if (g != NULL) {
BN_set_word(g, 2);
}
if (!p || !g || !DH_set0_pqg(dh, p, NULL, g)) {
DH_free(dh);
BN_free(p);
BN_free(g);
return NULL;
}
return dh;
}
/* Storage and initialization for DH parameters. */
static struct dhparam {
BIGNUM *(*const prime)(BIGNUM *); /* function to generate... */
DH *dh; /* ...this, used for keys.... */
const unsigned int min; /* ...of length >= this. */
} dhparams[] = {
{ BN_get_rfc3526_prime_8192, NULL, 6145 },
{ BN_get_rfc3526_prime_6144, NULL, 4097 },
{ BN_get_rfc3526_prime_4096, NULL, 3073 },
{ BN_get_rfc3526_prime_3072, NULL, 2049 },
{ BN_get_rfc3526_prime_2048, NULL, 1025 },
{ BN_get_rfc2409_prime_1024, NULL, 0 }
};
static void init_dh_params(void)
{
unsigned n;
for (n = 0; n < sizeof(dhparams)/sizeof(dhparams[0]); n++)
dhparams[n].dh = make_dh_params(dhparams[n].prime);
}
static void free_dh_params(void)
{
unsigned n;
/* DH_free() is a noop for a NULL parameter, so these are harmless
* in the (unexpected) case where these variables are already
* NULL. */
for (n = 0; n < sizeof(dhparams)/sizeof(dhparams[0]); n++) {
DH_free(dhparams[n].dh);
dhparams[n].dh = NULL;
}
}
/* Hand out the same DH structure though once generated as we leak
* memory otherwise and freeing the structure up after use would be
* hard to track and in fact is not needed at all as it is safe to
* use the same parameters over and over again security wise (in
* contrast to the keys itself) and code safe as the returned structure
* is duplicated by OpenSSL anyway. Hence no modification happens
* to our copy. */
DH *modssl_get_dh_params(unsigned keylen)
{
unsigned n;
for (n = 0; n < sizeof(dhparams)/sizeof(dhparams[0]); n++)
if (keylen >= dhparams[n].min)
return dhparams[n].dh;
return NULL; /* impossible to reach. */
}
static void ssl_add_version_components(apr_pool_t *p,
server_rec *s)
{
char *modver = ssl_var_lookup(p, s, NULL, NULL, "SSL_VERSION_INTERFACE");
char *libver = ssl_var_lookup(p, s, NULL, NULL, "SSL_VERSION_LIBRARY");
char *incver = ssl_var_lookup(p, s, NULL, NULL,
"SSL_VERSION_LIBRARY_INTERFACE");
ap_add_version_component(p, libver);
ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01876)
"%s compiled against Server: %s, Library: %s",
modver, AP_SERVER_BASEVERSION, incver);
}
/* _________________________________________________________________
**
** Managed Domains Interface
** _________________________________________________________________
*/
static APR_OPTIONAL_FN_TYPE(md_is_managed) *md_is_managed;
static APR_OPTIONAL_FN_TYPE(md_get_certificate) *md_get_certificate;
static APR_OPTIONAL_FN_TYPE(md_is_challenge) *md_is_challenge;
int ssl_is_challenge(conn_rec *c, const char *servername,
X509 **pcert, EVP_PKEY **pkey)
{
if (md_is_challenge) {
return md_is_challenge(c, servername, pcert, pkey);
}
*pcert = NULL;
*pkey = NULL;
return 0;
}
/*
* Per-module initialization
*/
apr_status_t ssl_init_Module(apr_pool_t *p, apr_pool_t *plog,
apr_pool_t *ptemp,
server_rec *base_server)
{
SSLModConfigRec *mc = myModConfig(base_server);
SSLSrvConfigRec *sc;
server_rec *s;
apr_status_t rv;
apr_array_header_t *pphrases;
if (SSLeay() < MODSSL_LIBRARY_VERSION) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, base_server, APLOGNO(01882)
"Init: this version of mod_ssl was compiled against "
"a newer library (%s, version currently loaded is %s)"
" - may result in undefined or erroneous behavior",
MODSSL_LIBRARY_TEXT, MODSSL_LIBRARY_DYNTEXT);
}
/* We initialize mc->pid per-process in the child init,
* but it should be initialized for startup before we
* call ssl_rand_seed() below.
*/
mc->pid = getpid();
/*
* Let us cleanup on restarts and exits
*/
apr_pool_cleanup_register(p, base_server,
ssl_init_ModuleKill,
apr_pool_cleanup_null);
/*
* Any init round fixes the global config
*/
ssl_config_global_create(base_server); /* just to avoid problems */
ssl_config_global_fix(mc);
/* Initialize our interface to mod_md, if it is loaded
*/
md_is_managed = APR_RETRIEVE_OPTIONAL_FN(md_is_managed);
md_get_certificate = APR_RETRIEVE_OPTIONAL_FN(md_get_certificate);
md_is_challenge = APR_RETRIEVE_OPTIONAL_FN(md_is_challenge);
if (!md_is_managed || !md_get_certificate) {
md_is_managed = NULL;
md_get_certificate = NULL;
}
/*
* try to fix the configuration and open the dedicated SSL
* logfile as early as possible
*/
for (s = base_server; s; s = s->next) {
sc = mySrvConfig(s);
if (sc->server) {
sc->server->sc = sc;
}
if (sc->vhost_id) {
/* already set. This should only happen if this config rec is
* shared with another server. Argh! */
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10104)
"%s, SSLSrvConfigRec shared from %s",
ssl_util_vhostid(p, s), sc->vhost_id);
}
/* Default to enabled if SSLEngine is not set explicitly, and
* the protocol is https. */
if (ap_get_server_protocol(s)
&& strcmp("https", ap_get_server_protocol(s)) == 0
&& sc->enabled == SSL_ENABLED_UNSET
&& (!apr_is_empty_array(sc->server->pks->cert_files))) {
sc->enabled = SSL_ENABLED_TRUE;
}
/* Derive the vhost id only after potentially defaulting-on
* sc->enabled since the port used may change. */
sc->vhost_id = ssl_util_vhostid(p, s);
sc->vhost_id_len = strlen(sc->vhost_id);
/* Fix up stuff that may not have been set. If sc->enabled is
* UNSET, then SSL is disabled on this vhost. */
if (sc->enabled == SSL_ENABLED_UNSET) {
sc->enabled = SSL_ENABLED_FALSE;
}
if (sc->session_cache_timeout == UNSET) {
sc->session_cache_timeout = SSL_SESSION_CACHE_TIMEOUT;
}
if (sc->server && sc->server->pphrase_dialog_type == SSL_PPTYPE_UNSET) {
sc->server->pphrase_dialog_type = SSL_PPTYPE_BUILTIN;
}
#ifdef HAVE_FIPS
if (sc->fips == UNSET) {
sc->fips = FALSE;
}
#endif
}
/*
* SSL external crypto device ("engine") support
*/
#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
if ((rv = ssl_init_Engine(base_server, p)) != APR_SUCCESS) {
return rv;
}
#endif
ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01883)
"Init: Initialized %s library", MODSSL_LIBRARY_NAME);
/*
* Seed the Pseudo Random Number Generator (PRNG)
* only need ptemp here; nothing inside allocated from the pool
* needs to live once we return from ssl_rand_seed().
*/
ssl_rand_seed(base_server, ptemp, SSL_RSCTX_STARTUP, "Init: ");
#ifdef HAVE_FIPS
if(sc->fips) {
if (!FIPS_mode()) {
if (FIPS_mode_set(1)) {
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(01884)
"Operating in SSL FIPS mode");
}
else {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01885) "FIPS mode failed");
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
}
}
else {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01886)
"SSL FIPS mode disabled");
}
#endif
/*
* initialize the mutex handling
*/
if (!ssl_mutex_init(base_server, p)) {
return HTTP_INTERNAL_SERVER_ERROR;
}
#ifdef HAVE_OCSP_STAPLING
ssl_stapling_certinfo_hash_init(p);
#endif
/*
* initialize session caching
*/
if ((rv = ssl_scache_init(base_server, p)) != APR_SUCCESS) {
return rv;
}
pphrases = apr_array_make(ptemp, 2, sizeof(char *));
/*
* initialize servers
*/
ap_log_error(APLOG_MARK, APLOG_INFO, 0, base_server, APLOGNO(01887)
"Init: Initializing (virtual) servers for SSL");
for (s = base_server; s; s = s->next) {
sc = mySrvConfig(s);
/*
* Either now skip this server when SSL is disabled for
* it or give out some information about what we're
* configuring.
*/
/*
* Read the server certificate and key
*/
if ((rv = ssl_init_ConfigureServer(s, p, ptemp, sc, pphrases))
!= APR_SUCCESS) {
return rv;
}
}
if (pphrases->nelts > 0) {
memset(pphrases->elts, 0, pphrases->elt_size * pphrases->nelts);
pphrases->nelts = 0;
ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02560)
"Init: Wiped out the queried pass phrases from memory");
}
/*
* Configuration consistency checks
*/
if ((rv = ssl_init_CheckServers(base_server, ptemp)) != APR_SUCCESS) {
return rv;
}
for (s = base_server; s; s = s->next) {
SSLDirConfigRec *sdc = ap_get_module_config(s->lookup_defaults,
&ssl_module);
sc = mySrvConfig(s);
if (sc->enabled == SSL_ENABLED_TRUE || sc->enabled == SSL_ENABLED_OPTIONAL) {
if ((rv = ssl_run_init_server(s, p, 0, sc->server->ssl_ctx)) != APR_SUCCESS) {
return rv;
}
}
if (sdc->proxy_enabled) {
rv = ssl_run_init_server(s, p, 1, sdc->proxy->ssl_ctx);
if (rv != APR_SUCCESS) {
return rv;
}
}
}
/*
* Announce mod_ssl and SSL library in HTTP Server field
* as ``mod_ssl/X.X.X OpenSSL/X.X.X''
*/
ssl_add_version_components(p, base_server);
modssl_init_app_data2_idx(); /* for modssl_get_app_data2() at request time */
init_dh_params();
#if !MODSSL_USE_OPENSSL_PRE_1_1_API
init_bio_methods();
#endif
return OK;
}
/*
* Support for external a Crypto Device ("engine"), usually
* a hardware accellerator card for crypto operations.
*/
#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
apr_status_t ssl_init_Engine(server_rec *s, apr_pool_t *p)
{
SSLModConfigRec *mc = myModConfig(s);
ENGINE *e;
if (mc->szCryptoDevice) {
if (!(e = ENGINE_by_id(mc->szCryptoDevice))) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01888)
"Init: Failed to load Crypto Device API `%s'",
mc->szCryptoDevice);
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
#ifdef ENGINE_CTRL_CHIL_SET_FORKCHECK
if (strEQ(mc->szCryptoDevice, "chil")) {
ENGINE_ctrl(e, ENGINE_CTRL_CHIL_SET_FORKCHECK, 1, 0, 0);
}
#endif
if (!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01889)
"Init: Failed to enable Crypto Device API `%s'",
mc->szCryptoDevice);
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01890)
"Init: loaded Crypto Device API `%s'",
mc->szCryptoDevice);
ENGINE_free(e);
}
return APR_SUCCESS;
}
#endif
#ifdef HAVE_TLSEXT
static apr_status_t ssl_init_ctx_tls_extensions(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
modssl_ctx_t *mctx)
{
apr_status_t rv;
/*
* Configure TLS extensions support
*/
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01893)
"Configuring TLS extension handling");
/*
* Server name indication (SNI)
*/
if (!SSL_CTX_set_tlsext_servername_callback(mctx->ssl_ctx,
ssl_callback_ServerNameIndication) ||
!SSL_CTX_set_tlsext_servername_arg(mctx->ssl_ctx, mctx)) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01894)
"Unable to initialize TLS servername extension "
"callback (incompatible OpenSSL version?)");
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
#ifdef HAVE_OCSP_STAPLING
/*
* OCSP Stapling support, status_request extension
*/
if ((mctx->pkp == FALSE) && (mctx->stapling_enabled == TRUE)) {
if ((rv = modssl_init_stapling(s, p, ptemp, mctx)) != APR_SUCCESS) {
return rv;
}
}
#endif
#ifdef HAVE_SRP
/*
* TLS-SRP support
*/
if (mctx->srp_vfile != NULL) {
int err;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02308)
"Using SRP verifier file [%s]", mctx->srp_vfile);
if (!(mctx->srp_vbase = SRP_VBASE_new(mctx->srp_unknown_user_seed))) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02309)
"Unable to initialize SRP verifier structure "
"[%s seed]",
mctx->srp_unknown_user_seed ? "with" : "without");
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
err = SRP_VBASE_init(mctx->srp_vbase, mctx->srp_vfile);
if (err != SRP_NO_ERROR) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02310)
"Unable to load SRP verifier file [error %d]", err);
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
SSL_CTX_set_srp_username_callback(mctx->ssl_ctx,
ssl_callback_SRPServerParams);
SSL_CTX_set_srp_cb_arg(mctx->ssl_ctx, mctx);
}
#endif
return APR_SUCCESS;
}
#endif
#if MODSSL_USE_OPENSSL_PRE_1_1_API
/*
* Enable/disable SSLProtocol. If the mod_ssl enables protocol
* which is disabled by default by OpenSSL, show a warning.
* "option" is for example SSL_OP_NO_SSLv3.
*/
static void ssl_set_ctx_protocol_option(server_rec *s,
SSL_CTX *ctx,
long option,
int enabled,
const char *name)
{
if (!enabled) {
SSL_CTX_set_options(ctx, option);
}
else if (SSL_CTX_get_options(ctx) & option) {
/*
* Do not backport to 2.4: SSL_CTX_clear_options()
* was only introduced in OpenSSL 0.9.8m.
*/
SSL_CTX_clear_options(ctx, option);
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(02904)
"Allowing SSLProtocol %s even though it is disabled "
"by OpenSSL by default on this system", name);
}
}
#endif
static apr_status_t ssl_init_ctx_protocol(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
modssl_ctx_t *mctx)
{
SSL_CTX *ctx = NULL;
MODSSL_SSL_METHOD_CONST SSL_METHOD *method = NULL;
char *cp;
int protocol = mctx->protocol;
SSLSrvConfigRec *sc = mySrvConfig(s);
#if !MODSSL_USE_OPENSSL_PRE_1_1_API
int prot;
#endif
/*
* Create the new per-server SSL context
*/
if (protocol == SSL_PROTOCOL_NONE) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02231)
"No SSL protocols available [hint: SSLProtocol]");
return ssl_die(s);
}
cp = apr_pstrcat(p,
#ifndef OPENSSL_NO_SSL3
(protocol & SSL_PROTOCOL_SSLV3 ? "SSLv3, " : ""),
#endif
(protocol & SSL_PROTOCOL_TLSV1 ? "TLSv1, " : ""),
#ifdef HAVE_TLSV1_X
(protocol & SSL_PROTOCOL_TLSV1_1 ? "TLSv1.1, " : ""),
(protocol & SSL_PROTOCOL_TLSV1_2 ? "TLSv1.2, " : ""),
#if SSL_HAVE_PROTOCOL_TLSV1_3
(protocol & SSL_PROTOCOL_TLSV1_3 ? "TLSv1.3, " : ""),
#endif
#endif
NULL);
cp[strlen(cp)-2] = NUL;
ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, s,
"Creating new SSL context (protocols: %s)", cp);
#if OPENSSL_VERSION_NUMBER < 0x10100000L
#ifndef OPENSSL_NO_SSL3
if (protocol == SSL_PROTOCOL_SSLV3) {
method = mctx->pkp ?
SSLv3_client_method() : /* proxy */
SSLv3_server_method(); /* server */
}
else
#endif
if (protocol == SSL_PROTOCOL_TLSV1) {
method = mctx->pkp ?
TLSv1_client_method() : /* proxy */
TLSv1_server_method(); /* server */
}
#ifdef HAVE_TLSV1_X
else if (protocol == SSL_PROTOCOL_TLSV1_1) {
method = mctx->pkp ?
TLSv1_1_client_method() : /* proxy */
TLSv1_1_server_method(); /* server */
}
else if (protocol == SSL_PROTOCOL_TLSV1_2) {
method = mctx->pkp ?
TLSv1_2_client_method() : /* proxy */
TLSv1_2_server_method(); /* server */
}
#if SSL_HAVE_PROTOCOL_TLSV1_3
else if (protocol == SSL_PROTOCOL_TLSV1_3) {
method = mctx->pkp ?
TLSv1_3_client_method() : /* proxy */
TLSv1_3_server_method(); /* server */
}
#endif
#endif
else { /* For multiple protocols, we need a flexible method */
method = mctx->pkp ?
SSLv23_client_method() : /* proxy */
SSLv23_server_method(); /* server */
}
#else
method = mctx->pkp ?
TLS_client_method() : /* proxy */
TLS_server_method(); /* server */
#endif
ctx = SSL_CTX_new(method);
mctx->ssl_ctx = ctx;
SSL_CTX_set_options(ctx, SSL_OP_ALL);
#if MODSSL_USE_OPENSSL_PRE_1_1_API
/* always disable SSLv2, as per RFC 6176 */
SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2);
#ifndef OPENSSL_NO_SSL3
ssl_set_ctx_protocol_option(s, ctx, SSL_OP_NO_SSLv3,
protocol & SSL_PROTOCOL_SSLV3, "SSLv3");
#endif
ssl_set_ctx_protocol_option(s, ctx, SSL_OP_NO_TLSv1,
protocol & SSL_PROTOCOL_TLSV1, "TLSv1");
#ifdef HAVE_TLSV1_X
ssl_set_ctx_protocol_option(s, ctx, SSL_OP_NO_TLSv1_1,
protocol & SSL_PROTOCOL_TLSV1_1, "TLSv1.1");
ssl_set_ctx_protocol_option(s, ctx, SSL_OP_NO_TLSv1_2,
protocol & SSL_PROTOCOL_TLSV1_2, "TLSv1.2");
#if SSL_HAVE_PROTOCOL_TLSV1_3
ssl_set_ctx_protocol_option(s, ctx, SSL_OP_NO_TLSv1_3,
protocol & SSL_PROTOCOL_TLSV1_3, "TLSv1.3");
#endif
#endif /* MODSSL_USE_OPENSSL_PRE_1_1_API */
#else /* #if OPENSSL_VERSION_NUMBER < 0x10100000L */
/* We first determine the maximum protocol version we should provide */
#if SSL_HAVE_PROTOCOL_TLSV1_3
if (SSL_HAVE_PROTOCOL_TLSV1_3 && (protocol & SSL_PROTOCOL_TLSV1_3)) {
prot = TLS1_3_VERSION;
} else
#endif
if (protocol & SSL_PROTOCOL_TLSV1_2) {
prot = TLS1_2_VERSION;
} else if (protocol & SSL_PROTOCOL_TLSV1_1) {
prot = TLS1_1_VERSION;
} else if (protocol & SSL_PROTOCOL_TLSV1) {
prot = TLS1_VERSION;
#ifndef OPENSSL_NO_SSL3
} else if (protocol & SSL_PROTOCOL_SSLV3) {
prot = SSL3_VERSION;
#endif
} else {
SSL_CTX_free(ctx);
mctx->ssl_ctx = NULL;
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(03378)
"No SSL protocols available [hint: SSLProtocol]");
return ssl_die(s);
}
SSL_CTX_set_max_proto_version(ctx, prot);
/* Next we scan for the minimal protocol version we should provide,
* but we do not allow holes between max and min */
#if SSL_HAVE_PROTOCOL_TLSV1_3
if (prot == TLS1_3_VERSION && protocol & SSL_PROTOCOL_TLSV1_2) {
prot = TLS1_2_VERSION;
}
#endif
if (prot == TLS1_2_VERSION && protocol & SSL_PROTOCOL_TLSV1_1) {
prot = TLS1_1_VERSION;
}
if (prot == TLS1_1_VERSION && protocol & SSL_PROTOCOL_TLSV1) {
prot = TLS1_VERSION;
}
#ifndef OPENSSL_NO_SSL3
if (prot == TLS1_VERSION && protocol & SSL_PROTOCOL_SSLV3) {
prot = SSL3_VERSION;
}
#endif
SSL_CTX_set_min_proto_version(ctx, prot);
#endif /* if OPENSSL_VERSION_NUMBER < 0x10100000L */
#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
if (sc->cipher_server_pref == TRUE) {
SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
}
#endif
#ifndef OPENSSL_NO_COMP
if (sc->compression != TRUE) {
#ifdef SSL_OP_NO_COMPRESSION
/* OpenSSL >= 1.0 only */
SSL_CTX_set_options(ctx, SSL_OP_NO_COMPRESSION);
#else
sk_SSL_COMP_zero(SSL_COMP_get_compression_methods());
#endif
}
#endif
#ifdef SSL_OP_NO_TICKET
/*
* Configure using RFC 5077 TLS session tickets
* for session resumption.
*/
if (sc->session_tickets == FALSE) {
SSL_CTX_set_options(ctx, SSL_OP_NO_TICKET);
}
#endif
#ifdef SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
if (sc->insecure_reneg == TRUE) {
SSL_CTX_set_options(ctx, SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION);
}
#endif
SSL_CTX_set_app_data(ctx, s);
/*
* Configure additional context ingredients
*/
SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE);
#ifdef HAVE_ECC
SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
#endif
#ifdef SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
/*
* Disallow a session from being resumed during a renegotiation,
* so that an acceptable cipher suite can be negotiated.
*/
SSL_CTX_set_options(ctx, SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
#endif
#ifdef SSL_MODE_RELEASE_BUFFERS
/* If httpd is configured to reduce mem usage, ask openssl to do so, too */
if (ap_max_mem_free != APR_ALLOCATOR_MAX_FREE_UNLIMITED)
SSL_CTX_set_mode(ctx, SSL_MODE_RELEASE_BUFFERS);
#endif
#if OPENSSL_VERSION_NUMBER >= 0x1010100fL
/* For OpenSSL >=1.1.1, disable auto-retry mode so it's possible
* to consume handshake records without blocking for app-data.
* https://github.com/openssl/openssl/issues/7178 */
SSL_CTX_clear_mode(ctx, SSL_MODE_AUTO_RETRY);
#endif
return APR_SUCCESS;
}
static void ssl_init_ctx_session_cache(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
modssl_ctx_t *mctx)
{
SSL_CTX *ctx = mctx->ssl_ctx;
SSLModConfigRec *mc = myModConfig(s);
SSL_CTX_set_session_cache_mode(ctx, mc->sesscache_mode);
if (mc->sesscache) {
SSL_CTX_sess_set_new_cb(ctx, ssl_callback_NewSessionCacheEntry);
SSL_CTX_sess_set_get_cb(ctx, ssl_callback_GetSessionCacheEntry);
SSL_CTX_sess_set_remove_cb(ctx, ssl_callback_DelSessionCacheEntry);
}
}
static void ssl_init_ctx_callbacks(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
modssl_ctx_t *mctx)
{
SSL_CTX *ctx = mctx->ssl_ctx;
SSL_CTX_set_tmp_dh_callback(ctx, ssl_callback_TmpDH);
SSL_CTX_set_info_callback(ctx, ssl_callback_Info);
#ifdef HAVE_TLS_ALPN
SSL_CTX_set_alpn_select_cb(ctx, ssl_callback_alpn_select, NULL);
#endif
}
static apr_status_t ssl_init_ctx_verify(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
modssl_ctx_t *mctx)
{
SSL_CTX *ctx = mctx->ssl_ctx;
int verify = SSL_VERIFY_NONE;
STACK_OF(X509_NAME) *ca_list;
if (mctx->auth.verify_mode == SSL_CVERIFY_UNSET) {
mctx->auth.verify_mode = SSL_CVERIFY_NONE;
}
if (mctx->auth.verify_depth == UNSET) {
mctx->auth.verify_depth = 1;
}
/*
* Configure callbacks for SSL context
*/
if (mctx->auth.verify_mode == SSL_CVERIFY_REQUIRE) {
verify |= SSL_VERIFY_PEER_STRICT;
}
if ((mctx->auth.verify_mode == SSL_CVERIFY_OPTIONAL) ||
(mctx->auth.verify_mode == SSL_CVERIFY_OPTIONAL_NO_CA))
{
verify |= SSL_VERIFY_PEER;
}
SSL_CTX_set_verify(ctx, verify, ssl_callback_SSLVerify);
/*
* Configure Client Authentication details
*/
if (mctx->auth.ca_cert_file || mctx->auth.ca_cert_path) {
ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, s,
"Configuring client authentication");
if (!SSL_CTX_load_verify_locations(ctx,
mctx->auth.ca_cert_file,
mctx->auth.ca_cert_path))
{
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01895)
"Unable to configure verify locations "
"for client authentication");
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
if (mctx->pks && (mctx->pks->ca_name_file || mctx->pks->ca_name_path)) {
ca_list = ssl_init_FindCAList(s, ptemp,
mctx->pks->ca_name_file,
mctx->pks->ca_name_path);
} else
ca_list = ssl_init_FindCAList(s, ptemp,
mctx->auth.ca_cert_file,
mctx->auth.ca_cert_path);
if (sk_X509_NAME_num(ca_list) <= 0) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01896)
"Unable to determine list of acceptable "
"CA certificates for client authentication");
return ssl_die(s);
}
SSL_CTX_set_client_CA_list(ctx, ca_list);
}
/*
* Give a warning when no CAs were configured but client authentication
* should take place. This cannot work.
*/
if (mctx->auth.verify_mode == SSL_CVERIFY_REQUIRE) {
ca_list = SSL_CTX_get_client_CA_list(ctx);
if (sk_X509_NAME_num(ca_list) == 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01897)
"Init: Oops, you want to request client "
"authentication, but no CAs are known for "
"verification!? [Hint: SSLCACertificate*]");
}
}
return APR_SUCCESS;
}
static apr_status_t ssl_init_ctx_cipher_suite(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
modssl_ctx_t *mctx)
{
SSL_CTX *ctx = mctx->ssl_ctx;
const char *suite;
/*
* Configure SSL Cipher Suite. Always disable NULL and export ciphers,
* see also ssl_engine_config.c:ssl_cmd_SSLCipherSuite().
* OpenSSL's SSL_DEFAULT_CIPHER_LIST includes !aNULL:!eNULL from 0.9.8f,
* and !EXP from 0.9.8zf/1.0.1m/1.0.2a, so append them while we support
* earlier versions.
*/
suite = mctx->auth.cipher_suite ? mctx->auth.cipher_suite :
apr_pstrcat(ptemp, SSL_DEFAULT_CIPHER_LIST, ":!aNULL:!eNULL:!EXP",
NULL);
ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, s,
"Configuring permitted SSL ciphers [%s]",
suite);
if (!SSL_CTX_set_cipher_list(ctx, suite)) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01898)
"Unable to configure permitted SSL ciphers");
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
#if SSL_HAVE_PROTOCOL_TLSV1_3
if (mctx->auth.tls13_ciphers
&& !SSL_CTX_set_ciphersuites(ctx, mctx->auth.tls13_ciphers)) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10127)
"Unable to configure permitted TLSv1.3 ciphers");
ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
return ssl_die(s);
}
#endif
return APR_SUCCESS;
}
static apr_status_t ssl_init_ctx_crl(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
modssl_ctx_t *mctx)
{
X509_STORE *store = SSL_CTX_get_cert_store(mctx->ssl_ctx);
unsigned long crlflags = 0;
char *cfgp = mctx->pkp ? "SSLProxy" : "SSL";
int crl_check_mode;
if (mctx->ocsp_mask == UNSET) {
mctx->ocsp_mask = SSL_OCSPCHECK_NONE;
}
if (mctx->crl_check_mask == UNSET) {
mctx->crl_check_mask = SSL_CRLCHECK_NONE;
}
crl_check_mode = mctx->crl_check_mask & ~SSL_CRLCHECK_FLAGS;
/*
* Configure Certificate Revocation List (CRL) Details
*/
if (!(mctx->crl_file || mctx->crl_path)) {
if (crl_check_mode == SSL_CRLCHECK_LEAF ||
crl_check_mode == SSL_CRLCHECK_CHAIN) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01899)
"Host %s: CRL checking has been enabled, but "
"neither %sCARevocationFile nor %sCARevocationPath "
"is configured", mctx->sc->vhost_id, cfgp, cfgp);
return ssl_die(s);
}
return APR_SUCCESS;
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01900)
"Configuring certificate revocation facility");
if (!store || !X509_STORE_load_locations(store, mctx->crl_file,
mctx->crl_path)) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01901)