diff options
Diffstat (limited to 'modules/ssl/ssl_engine_init.c')
| -rw-r--r-- | modules/ssl/ssl_engine_init.c | 2367 |
1 files changed, 2367 insertions, 0 deletions
diff --git a/modules/ssl/ssl_engine_init.c b/modules/ssl/ssl_engine_init.c new file mode 100644 index 0000000..825621d --- /dev/null +++ b/modules/ssl/ssl_engine_init.c @@ -0,0 +1,2367 @@ +/* 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) + +APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, add_cert_files, + (server_rec *s, apr_pool_t *p, + apr_array_header_t *cert_files, apr_array_header_t *key_files), + (s, p, cert_files, key_files), + OK, DECLINED) + +APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, add_fallback_cert_files, + (server_rec *s, apr_pool_t *p, + apr_array_header_t *cert_files, apr_array_header_t *key_files), + (s, p, cert_files, key_files), + OK, DECLINED) + +APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, answer_challenge, + (conn_rec *c, const char *server_name, + X509 **pcert, EVP_PKEY **pkey), + (c, server_name, pcert, pkey), + DECLINED, 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 +/* 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; +} + +/* + * 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. */ +} +#endif + +static void ssl_add_version_components(apr_pool_t *ptemp, apr_pool_t *pconf, + server_rec *s) +{ + char *modver = ssl_var_lookup(ptemp, s, NULL, NULL, "SSL_VERSION_INTERFACE"); + char *libver = ssl_var_lookup(ptemp, s, NULL, NULL, "SSL_VERSION_LIBRARY"); + char *incver = ssl_var_lookup(ptemp, s, NULL, NULL, + "SSL_VERSION_LIBRARY_INTERFACE"); + + ap_add_version_component(pconf, libver); + + ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01876) + "%s compiled against Server: %s, Library: %s", + modver, AP_SERVER_BASEVERSION, incver); +} + +/* _________________________________________________________________ +** +** Let other answer special connection attempts. +** Used in ACME challenge handling by mod_md. +** _________________________________________________________________ +*/ + +int ssl_is_challenge(conn_rec *c, const char *servername, + X509 **pcert, EVP_PKEY **pkey, + const char **pcert_pem, const char **pkey_pem) +{ + *pcert = NULL; + *pkey = NULL; + *pcert_pem = *pkey_pem = NULL; + if (ap_ssl_answer_challenge(c, servername, pcert_pem, pkey_pem)) { + return 1; + } + else if (OK == ssl_run_answer_challenge(c, servername, pcert, pkey)) { + return 1; + } + return 0; +} + +#ifdef HAVE_FIPS +static apr_status_t modssl_fips_cleanup(void *data) +{ + modssl_fips_enable(0); + return APR_SUCCESS; +} +#endif + +/* + * 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); + + /* + * 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; + } + + /* + * Create the server host:port string because we need it a lot + */ + 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); + } + sc->vhost_id = ssl_util_vhostid(p, s); + sc->vhost_id_len = strlen(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; + } + + /* 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; + } + } + +#if APR_HAS_THREADS && MODSSL_USE_OPENSSL_PRE_1_1_API + ssl_util_thread_setup(p); +#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, base_server, 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 (!modssl_fips_is_enabled() && mc->fips == TRUE) { + if (!modssl_fips_enable(1)) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, base_server, APLOGNO(01885) + "Could not enable FIPS mode"); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, base_server); + return ssl_die(base_server); + } + + apr_pool_cleanup_register(p, NULL, modssl_fips_cleanup, + apr_pool_cleanup_null); + } + + /* Log actual FIPS mode which the SSL library is operating under, + * which may have been set outside of the mod_ssl + * configuration. */ + if (modssl_fips_is_enabled()) { + ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, base_server, APLOGNO(01884) + MODSSL_LIBRARY_NAME " has FIPS mode enabled"); + } + else { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, base_server, APLOGNO(01886) + MODSSL_LIBRARY_NAME " has 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(ptemp, p, base_server); + + modssl_init_app_data2_idx(); /* for modssl_get_app_data2() at request time */ + +#if MODSSL_USE_OPENSSL_PRE_1_1_API + init_dh_params(); +#else + init_bio_methods(); +#endif + +#ifdef HAVE_OPENSSL_KEYLOG + { + const char *logfn = getenv("SSLKEYLOGFILE"); + + if (logfn) { + rv = apr_file_open(&mc->keylog_file, logfn, + APR_FOPEN_CREATE|APR_FOPEN_WRITE|APR_FOPEN_APPEND|APR_FOPEN_LARGEFILE, + APR_FPROT_UREAD|APR_FPROT_UWRITE, + mc->pPool); + if (rv) { + ap_log_error(APLOG_MARK, APLOG_NOTICE, rv, s, APLOGNO(10226) + "Could not open log file '%s' configured via SSLKEYLOGFILE", + logfn); + return rv; + } + + ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(10227) + "Init: Logging SSL private key material to %s", logfn); + } + } +#endif + + return OK; +} + +/* + * Support for external a Crypto Device ("engine"), usually + * a hardware accelerator 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"); + + /* + * The Server Name Indication (SNI) provided by the ClientHello can be + * used to select the right (name-based-)vhost and its SSL configuration + * before the handshake takes place. + */ + 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); + } + +#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER) + /* + * The ClientHello callback also allows to retrieve the SNI, but since it + * runs at the earliest possible connection stage we can even set the TLS + * protocol version(s) according to the selected (name-based-)vhost, which + * is not possible at the SNI callback stage (due to OpenSSL internals). + */ + SSL_CTX_set_client_hello_cb(mctx->ssl_ctx, ssl_callback_ClientHello, NULL); +#endif + +#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 + +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 OPENSSL_VERSION_NUMBER >= 0x10100000L + 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 OPENSSL_VERSION_NUMBER < 0x10100000L || \ + (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20800000L) + /* always disable SSLv2, as per RFC 6176 */ + SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2); + +#ifndef OPENSSL_NO_SSL3 + if (!(protocol & SSL_PROTOCOL_SSLV3)) { + SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3); + } +#endif + + if (!(protocol & SSL_PROTOCOL_TLSV1)) { + SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1); + } + +#ifdef HAVE_TLSV1_X + if (!(protocol & SSL_PROTOCOL_TLSV1_1)) { + SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_1); + } + + if (!(protocol & SSL_PROTOCOL_TLSV1_2)) { + SSL_CTX_set_options(ctx, SSL_OP_NO_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 + +#else /* #if OPENSSL_VERSION_NUMBER < 0x10100000L */ + /* We first determine the maximum protocol version we should provide */ +#if SSL_HAVE_PROTOCOL_TLSV1_3 + if (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 + +#ifdef HAVE_OPENSSL_KEYLOG + if (mctx->sc->mc->keylog_file) { + SSL_CTX_set_keylog_callback(ctx, modssl_callback_keylog); + } +#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; + +#if MODSSL_USE_OPENSSL_PRE_1_1_API + /* Note that for OpenSSL>=1.1, auto selection is enabled via + * SSL_CTX_set_dh_auto(,1) if no parameter is configured. */ + SSL_CTX_set_tmp_dh_callback(ctx, ssl_callback_TmpDH); +#endif + + 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_INLINE +int modssl_CTX_load_verify_locations(SSL_CTX *ctx, + const char *file, + const char *path) +{ +#if OPENSSL_VERSION_NUMBER < 0x30000000L + if (!SSL_CTX_load_verify_locations(ctx, file, path)) + return 0; +#else + if (file && !SSL_CTX_load_verify_file(ctx, file)) + return 0; + if (path && !SSL_CTX_load_verify_dir(ctx, path)) + return 0; +#endif + return 1; +} + +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 (!modssl_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_INLINE +int modssl_X509_STORE_load_locations(X509_STORE *store, + const char *file, + const char *path) +{ +#if OPENSSL_VERSION_NUMBER < 0x30000000L + if (!X509_STORE_load_locations(store, file, path)) + return 0; +#else + if (file && !X509_STORE_load_file(store, file)) + return 0; + if (path && !X509_STORE_load_path(store, path)) + return 0; +#endif + return 1; +} + +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 || !modssl_X509_STORE_load_locations(store, mctx->crl_file, + mctx->crl_path)) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01901) + "Host %s: unable to configure X.509 CRL storage " + "for certificate revocation", mctx->sc->vhost_id); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return ssl_die(s); + } + + switch (crl_check_mode) { + case SSL_CRLCHECK_LEAF: + crlflags = X509_V_FLAG_CRL_CHECK; + break; + case SSL_CRLCHECK_CHAIN: + crlflags = X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL; + break; + default: + crlflags = 0; + } + + if (crlflags) { + X509_STORE_set_flags(store, crlflags); + } else { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01902) + "Host %s: X.509 CRL storage locations configured, " + "but CRL checking (%sCARevocationCheck) is not " + "enabled", mctx->sc->vhost_id, cfgp); + } + + return APR_SUCCESS; +} + +/* + * Read a file that optionally contains the server certificate in PEM + * format, possibly followed by a sequence of CA certificates that + * should be sent to the peer in the SSL Certificate message. + */ +static int use_certificate_chain( + SSL_CTX *ctx, char *file, int skipfirst, pem_password_cb *cb) +{ + BIO *bio; + X509 *x509; + unsigned long err; + int n; + + if ((bio = BIO_new(BIO_s_file())) == NULL) + return -1; + if (BIO_read_filename(bio, file) <= 0) { + BIO_free(bio); + return -1; + } + /* optionally skip a leading server certificate */ + if (skipfirst) { + if ((x509 = PEM_read_bio_X509(bio, NULL, cb, NULL)) == NULL) { + BIO_free(bio); + return -1; + } + X509_free(x509); + } + /* free a perhaps already configured extra chain */ +#ifdef OPENSSL_NO_SSL_INTERN + SSL_CTX_clear_extra_chain_certs(ctx); +#else + if (ctx->extra_certs != NULL) { + sk_X509_pop_free((STACK_OF(X509) *)ctx->extra_certs, X509_free); + ctx->extra_certs = NULL; + } +#endif + + /* create new extra chain by loading the certs */ + n = 0; + ERR_clear_error(); + while ((x509 = PEM_read_bio_X509(bio, NULL, cb, NULL)) != NULL) { + if (!SSL_CTX_add_extra_chain_cert(ctx, x509)) { + X509_free(x509); + BIO_free(bio); + return -1; + } + n++; + } + /* Make sure that only the error is just an EOF */ + if ((err = ERR_peek_error()) > 0) { + if (!( ERR_GET_LIB(err) == ERR_LIB_PEM + && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) { + BIO_free(bio); + return -1; + } + while (ERR_get_error() > 0) ; + } + BIO_free(bio); + return n; +} + +static apr_status_t ssl_init_ctx_cert_chain(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + modssl_ctx_t *mctx) +{ + BOOL skip_first = FALSE; + int i, n; + const char *chain = mctx->cert_chain; + + /* + * Optionally configure extra server certificate chain certificates. + * This is usually done by OpenSSL automatically when one of the + * server cert issuers are found under SSLCACertificatePath or in + * SSLCACertificateFile. But because these are intended for client + * authentication it can conflict. For instance when you use a + * Global ID server certificate you've to send out the intermediate + * CA certificate, too. When you would just configure this with + * SSLCACertificateFile and also use client authentication mod_ssl + * would accept all clients also issued by this CA. Obviously this + * isn't what we want in this situation. So this feature here exists + * to allow one to explicitly configure CA certificates which are + * used only for the server certificate chain. + */ + if (!chain) { + return APR_SUCCESS; + } + + for (i = 0; (i < mctx->pks->cert_files->nelts) && + APR_ARRAY_IDX(mctx->pks->cert_files, i, const char *); i++) { + if (strEQ(APR_ARRAY_IDX(mctx->pks->cert_files, i, const char *), chain)) { + skip_first = TRUE; + break; + } + } + + n = use_certificate_chain(mctx->ssl_ctx, (char *)chain, skip_first, NULL); + if (n < 0) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01903) + "Failed to configure CA certificate chain!"); + return ssl_die(s); + } + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01904) + "Configuring server certificate chain " + "(%d CA certificate%s)", + n, n == 1 ? "" : "s"); + + return APR_SUCCESS; +} + +static apr_status_t ssl_init_ctx(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + modssl_ctx_t *mctx) +{ + apr_status_t rv; + + if ((rv = ssl_init_ctx_protocol(s, p, ptemp, mctx)) != APR_SUCCESS) { + return rv; + } + + ssl_init_ctx_session_cache(s, p, ptemp, mctx); + + ssl_init_ctx_callbacks(s, p, ptemp, mctx); + + if ((rv = ssl_init_ctx_verify(s, p, ptemp, mctx)) != APR_SUCCESS) { + return rv; + } + + if ((rv = ssl_init_ctx_cipher_suite(s, p, ptemp, mctx)) != APR_SUCCESS) { + return rv; + } + + if ((rv = ssl_init_ctx_crl(s, p, ptemp, mctx)) != APR_SUCCESS) { + return rv; + } + + if (mctx->pks) { + /* XXX: proxy support? */ + if ((rv = ssl_init_ctx_cert_chain(s, p, ptemp, mctx)) != APR_SUCCESS) { + return rv; + } +#ifdef HAVE_TLSEXT + if ((rv = ssl_init_ctx_tls_extensions(s, p, ptemp, mctx)) != + APR_SUCCESS) { + return rv; + } +#endif + } + + return APR_SUCCESS; +} + +static void ssl_check_public_cert(server_rec *s, + apr_pool_t *ptemp, + X509 *cert, + const char *key_id) +{ + int is_ca, pathlen; + + if (!cert) { + return; + } + + /* + * Some information about the certificate(s) + */ + + if (modssl_X509_getBC(cert, &is_ca, &pathlen)) { + if (is_ca) { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01906) + "%s server certificate is a CA certificate " + "(BasicConstraints: CA == TRUE !?)", key_id); + } + + if (pathlen > 0) { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01907) + "%s server certificate is not a leaf certificate " + "(BasicConstraints: pathlen == %d > 0 !?)", + key_id, pathlen); + } + } + + if (modssl_X509_match_name(ptemp, cert, (const char *)s->server_hostname, + TRUE, s) == FALSE) { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01909) + "%s server certificate does NOT include an ID " + "which matches the server name", key_id); + } +} + +/* prevent OpenSSL from showing its "Enter PEM pass phrase:" prompt */ +static int ssl_no_passwd_prompt_cb(char *buf, int size, int rwflag, + void *userdata) { + return 0; +} + +static APR_INLINE int modssl_DH_bits(DH *dh) +{ +#if OPENSSL_VERSION_NUMBER < 0x30000000L + return DH_bits(dh); +#else + return BN_num_bits(DH_get0_p(dh)); +#endif +} + +/* SSL_CTX_use_PrivateKey_file() can fail either because the private + * key was encrypted, or due to a mismatch between an already-loaded + * cert and the key - a common misconfiguration - from calling + * X509_check_private_key(). This macro is passed the last error code + * off the OpenSSL stack and evaluates to true only for the first + * case. With OpenSSL < 3 the second case is identifiable by the + * function code, but function codes are not used from 3.0. */ +#if OPENSSL_VERSION_NUMBER < 0x30000000L +#define CHECK_PRIVKEY_ERROR(ec) (ERR_GET_FUNC(ec) != X509_F_X509_CHECK_PRIVATE_KEY) +#else +#define CHECK_PRIVKEY_ERROR(ec) (ERR_GET_LIB(ec) != ERR_LIB_X509 \ + || (ERR_GET_REASON(ec) != X509_R_KEY_TYPE_MISMATCH \ + && ERR_GET_REASON(ec) != X509_R_KEY_VALUES_MISMATCH \ + && ERR_GET_REASON(ec) != X509_R_UNKNOWN_KEY_TYPE)) +#endif + +static apr_status_t ssl_init_server_certs(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + modssl_ctx_t *mctx, + apr_array_header_t *pphrases) +{ + SSLModConfigRec *mc = myModConfig(s); + const char *vhost_id = mctx->sc->vhost_id, *key_id, *certfile, *keyfile; + int i; + X509 *cert; + DH *dh; +#ifdef HAVE_ECC + EC_GROUP *ecparams = NULL; + int nid; + EC_KEY *eckey = NULL; +#endif +#ifndef HAVE_SSL_CONF_CMD + SSL *ssl; +#endif + + /* no OpenSSL default prompts for any of the SSL_CTX_use_* calls, please */ + SSL_CTX_set_default_passwd_cb(mctx->ssl_ctx, ssl_no_passwd_prompt_cb); + + /* Iterate over the SSLCertificateFile array */ + for (i = 0; (i < mctx->pks->cert_files->nelts) && + (certfile = APR_ARRAY_IDX(mctx->pks->cert_files, i, + const char *)); + i++) { + EVP_PKEY *pkey; + const char *engine_certfile = NULL; + + key_id = apr_psprintf(ptemp, "%s:%d", vhost_id, i); + + ERR_clear_error(); + + /* first the certificate (public key) */ + if (modssl_is_engine_id(certfile)) { + engine_certfile = certfile; + } + else if (mctx->cert_chain) { + if ((SSL_CTX_use_certificate_file(mctx->ssl_ctx, certfile, + SSL_FILETYPE_PEM) < 1)) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02561) + "Failed to configure certificate %s, check %s", + key_id, certfile); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return APR_EGENERAL; + } + } else { + if ((SSL_CTX_use_certificate_chain_file(mctx->ssl_ctx, + certfile) < 1)) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02562) + "Failed to configure certificate %s (with chain)," + " check %s", key_id, certfile); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return APR_EGENERAL; + } + } + + /* and second, the private key */ + if (i < mctx->pks->key_files->nelts) { + keyfile = APR_ARRAY_IDX(mctx->pks->key_files, i, const char *); + } else { + keyfile = certfile; + } + + ERR_clear_error(); + + if (modssl_is_engine_id(keyfile)) { + apr_status_t rv; + + cert = NULL; + + if ((rv = modssl_load_engine_keypair(s, ptemp, vhost_id, + engine_certfile, keyfile, + &cert, &pkey))) { + return rv; + } + + if (cert) { + if (SSL_CTX_use_certificate(mctx->ssl_ctx, cert) < 1) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10137) + "Failed to configure engine certificate %s, check %s", + key_id, certfile); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return APR_EGENERAL; + } + + /* SSL_CTX now owns the cert. */ + X509_free(cert); + } + + if (SSL_CTX_use_PrivateKey(mctx->ssl_ctx, pkey) < 1) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10130) + "Failed to configure private key %s from engine", + keyfile); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return APR_EGENERAL; + } + + /* SSL_CTX now owns the key */ + EVP_PKEY_free(pkey); + } + else if ((SSL_CTX_use_PrivateKey_file(mctx->ssl_ctx, keyfile, + SSL_FILETYPE_PEM) < 1) + && CHECK_PRIVKEY_ERROR(ERR_peek_last_error())) { + ssl_asn1_t *asn1; + const unsigned char *ptr; + + ERR_clear_error(); + + /* perhaps it's an encrypted private key, so try again */ + ssl_load_encrypted_pkey(s, ptemp, i, keyfile, &pphrases); + + if (!(asn1 = ssl_asn1_table_get(mc->tPrivateKey, key_id)) || + !(ptr = asn1->cpData) || + !(pkey = d2i_AutoPrivateKey(NULL, &ptr, asn1->nData)) || + (SSL_CTX_use_PrivateKey(mctx->ssl_ctx, pkey) < 1)) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02564) + "Failed to configure encrypted (?) private key %s," + " check %s", key_id, keyfile); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return APR_EGENERAL; + } + } + + if (SSL_CTX_check_private_key(mctx->ssl_ctx) < 1) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02565) + "Certificate and private key %s from %s and %s " + "do not match", key_id, certfile, keyfile); + return APR_EGENERAL; + } + +#ifdef HAVE_SSL_CONF_CMD + /* + * workaround for those OpenSSL versions where SSL_CTX_get0_certificate + * is not yet available: create an SSL struct which we dispose of + * as soon as we no longer need access to the cert. (Strictly speaking, + * SSL_CTX_get0_certificate does not depend on the SSL_CONF stuff, + * but there's no reliable way to check for its existence, so we + * assume that if SSL_CONF is available, it's OpenSSL 1.0.2 or later, + * and SSL_CTX_get0_certificate is implemented.) + */ + if (!(cert = SSL_CTX_get0_certificate(mctx->ssl_ctx))) { +#else + ssl = SSL_new(mctx->ssl_ctx); + if (ssl) { + /* Workaround bug in SSL_get_certificate in OpenSSL 0.9.8y */ + SSL_set_connect_state(ssl); + cert = SSL_get_certificate(ssl); + } + if (!ssl || !cert) { +#endif + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02566) + "Unable to retrieve certificate %s", key_id); +#ifndef HAVE_SSL_CONF_CMD + if (ssl) + SSL_free(ssl); +#endif + return APR_EGENERAL; + } + + /* warn about potential cert issues */ + ssl_check_public_cert(s, ptemp, cert, key_id); + +#if defined(HAVE_OCSP_STAPLING) && !defined(SSL_CTRL_SET_CURRENT_CERT) + /* + * OpenSSL up to 1.0.1: configure stapling as we go. In 1.0.2 + * and later, there's SSL_CTX_set_current_cert, which allows + * iterating over all certs in an SSL_CTX (including those possibly + * loaded via SSLOpenSSLConfCmd Certificate), so for 1.0.2 and + * later, we defer to the code in ssl_init_server_ctx. + */ + if (!ssl_stapling_init_cert(s, p, ptemp, mctx, cert)) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02567) + "Unable to configure certificate %s for stapling", + key_id); + } +#endif + +#ifndef HAVE_SSL_CONF_CMD + SSL_free(ssl); +#endif + + ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02568) + "Certificate and private key %s configured from %s and %s", + key_id, certfile, keyfile); + } + + /* + * Try to read DH parameters from the (first) SSLCertificateFile + */ + certfile = APR_ARRAY_IDX(mctx->pks->cert_files, 0, const char *); + if (certfile && !modssl_is_engine_id(certfile) + && (dh = ssl_dh_GetParamFromFile(certfile))) { + /* ### This should be replaced with SSL_CTX_set0_tmp_dh_pkey() + * for OpenSSL 3.0+. */ + SSL_CTX_set_tmp_dh(mctx->ssl_ctx, dh); + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02540) + "Custom DH parameters (%d bits) for %s loaded from %s", + modssl_DH_bits(dh), vhost_id, certfile); + DH_free(dh); + } +#if !MODSSL_USE_OPENSSL_PRE_1_1_API + else { + /* If no parameter is manually configured, enable auto + * selection. */ + SSL_CTX_set_dh_auto(mctx->ssl_ctx, 1); + } +#endif + +#ifdef HAVE_ECC + /* + * Similarly, try to read the ECDH curve name from SSLCertificateFile... + */ + if (certfile && !modssl_is_engine_id(certfile) + && (ecparams = ssl_ec_GetParamFromFile(certfile)) + && (nid = EC_GROUP_get_curve_name(ecparams)) + && (eckey = EC_KEY_new_by_curve_name(nid))) { + SSL_CTX_set_tmp_ecdh(mctx->ssl_ctx, eckey); + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02541) + "ECDH curve %s for %s specified in %s", + OBJ_nid2sn(nid), vhost_id, certfile); + } + /* + * ...otherwise, enable auto curve selection (OpenSSL 1.0.2) + * or configure NIST P-256 (required to enable ECDHE for earlier versions) + * ECDH is always enabled in 1.1.0 unless excluded from SSLCipherList + */ +#if MODSSL_USE_OPENSSL_PRE_1_1_API + else { +#if defined(SSL_CTX_set_ecdh_auto) + SSL_CTX_set_ecdh_auto(mctx->ssl_ctx, 1); +#else + eckey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); + SSL_CTX_set_tmp_ecdh(mctx->ssl_ctx, eckey); +#endif + } +#endif + /* OpenSSL assures us that _free() is NULL-safe */ + EC_KEY_free(eckey); + EC_GROUP_free(ecparams); +#endif + + return APR_SUCCESS; +} + +#ifdef HAVE_TLS_SESSION_TICKETS +static apr_status_t ssl_init_ticket_key(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + modssl_ctx_t *mctx) +{ + apr_status_t rv; + apr_file_t *fp; + apr_size_t len; + char buf[TLSEXT_TICKET_KEY_LEN]; + char *path; + modssl_ticket_key_t *ticket_key = mctx->ticket_key; + int res; + + if (!ticket_key->file_path) { + return APR_SUCCESS; + } + + path = ap_server_root_relative(p, ticket_key->file_path); + + rv = apr_file_open(&fp, path, APR_READ|APR_BINARY, + APR_OS_DEFAULT, ptemp); + + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02286) + "Failed to open ticket key file %s: (%d) %pm", + path, rv, &rv); + return ssl_die(s); + } + + rv = apr_file_read_full(fp, &buf[0], TLSEXT_TICKET_KEY_LEN, &len); + + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02287) + "Failed to read %d bytes from %s: (%d) %pm", + TLSEXT_TICKET_KEY_LEN, path, rv, &rv); + return ssl_die(s); + } + + memcpy(ticket_key->key_name, buf, 16); + memcpy(ticket_key->aes_key, buf + 32, 16); +#if OPENSSL_VERSION_NUMBER < 0x30000000L + memcpy(ticket_key->hmac_secret, buf + 16, 16); + res = SSL_CTX_set_tlsext_ticket_key_cb(mctx->ssl_ctx, + ssl_callback_SessionTicket); +#else + ticket_key->mac_params[0] = + OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, buf + 16, 16); + ticket_key->mac_params[1] = + OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST, "sha256", 0); + ticket_key->mac_params[2] = + OSSL_PARAM_construct_end(); + res = SSL_CTX_set_tlsext_ticket_key_evp_cb(mctx->ssl_ctx, + ssl_callback_SessionTicket); +#endif + if (!res) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01913) + "Unable to initialize TLS session ticket key callback " + "(incompatible OpenSSL version?)"); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return ssl_die(s); + } + + ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02288) + "TLS session ticket key for %s successfully loaded from %s", + (mySrvConfig(s))->vhost_id, path); + + return APR_SUCCESS; +} +#endif + +static BOOL load_x509_info(apr_pool_t *ptemp, + STACK_OF(X509_INFO) *sk, + const char *filename) +{ + BIO *in; + + if (!(in = BIO_new(BIO_s_file()))) { + return FALSE; + } + + if (BIO_read_filename(in, filename) <= 0) { + BIO_free(in); + return FALSE; + } + + ERR_clear_error(); + + PEM_X509_INFO_read_bio(in, sk, NULL, NULL); + + BIO_free(in); + + return TRUE; +} + +static apr_status_t ssl_init_proxy_certs(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + modssl_ctx_t *mctx) +{ + int n, ncerts = 0; + STACK_OF(X509_INFO) *sk; + modssl_pk_proxy_t *pkp = mctx->pkp; + STACK_OF(X509) *chain; + X509_STORE_CTX *sctx; + X509_STORE *store = SSL_CTX_get_cert_store(mctx->ssl_ctx); + +#if OPENSSL_VERSION_NUMBER >= 0x1010100fL + /* For OpenSSL >=1.1.1, turn on client cert support which is + * otherwise turned off by default (by design). + * https://github.com/openssl/openssl/issues/6933 */ + SSL_CTX_set_post_handshake_auth(mctx->ssl_ctx, 1); +#endif + + SSL_CTX_set_client_cert_cb(mctx->ssl_ctx, + ssl_callback_proxy_cert); + + if (!(pkp->cert_file || pkp->cert_path)) { + return APR_SUCCESS; + } + + sk = sk_X509_INFO_new_null(); + + if (pkp->cert_file) { + load_x509_info(ptemp, sk, pkp->cert_file); + } + + if (pkp->cert_path) { + ssl_init_ca_cert_path(s, ptemp, pkp->cert_path, NULL, sk); + } + + if ((ncerts = sk_X509_INFO_num(sk)) <= 0) { + sk_X509_INFO_free(sk); + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(02206) + "no client certs found for SSL proxy"); + return APR_SUCCESS; + } + + /* Check that all client certs have got certificates and private + * keys. */ + for (n = 0; n < ncerts; n++) { + X509_INFO *inf = sk_X509_INFO_value(sk, n); + + if (!inf->x509 || !inf->x_pkey || !inf->x_pkey->dec_pkey || + inf->enc_data) { + sk_X509_INFO_free(sk); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s, APLOGNO(02252) + "incomplete client cert configured for SSL proxy " + "(missing or encrypted private key?)"); + return ssl_die(s); + } + + if (X509_check_private_key(inf->x509, inf->x_pkey->dec_pkey) != 1) { + ssl_log_xerror(SSLLOG_MARK, APLOG_STARTUP, 0, ptemp, s, inf->x509, + APLOGNO(02326) "proxy client certificate and " + "private key do not match"); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s); + return ssl_die(s); + } + } + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02207) + "loaded %d client certs for SSL proxy", + ncerts); + pkp->certs = sk; + + + if (!pkp->ca_cert_file || !store) { + return APR_SUCCESS; + } + + /* If SSLProxyMachineCertificateChainFile is configured, load all + * the CA certs and have OpenSSL attempt to construct a full chain + * from each configured end-entity cert up to a root. This will + * allow selection of the correct cert given a list of root CA + * names in the certificate request from the server. */ + pkp->ca_certs = (STACK_OF(X509) **) apr_pcalloc(p, ncerts * sizeof(sk)); + sctx = X509_STORE_CTX_new(); + + if (!sctx) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02208) + "SSL proxy client cert initialization failed"); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return ssl_die(s); + } + + modssl_X509_STORE_load_locations(store, pkp->ca_cert_file, NULL); + + for (n = 0; n < ncerts; n++) { + int i; + + X509_INFO *inf = sk_X509_INFO_value(pkp->certs, n); + X509_STORE_CTX_init(sctx, store, inf->x509, NULL); + + /* Attempt to verify the client cert */ + if (X509_verify_cert(sctx) != 1) { + int err = X509_STORE_CTX_get_error(sctx); + ssl_log_xerror(SSLLOG_MARK, APLOG_WARNING, 0, ptemp, s, inf->x509, + APLOGNO(02270) "SSL proxy client cert chain " + "verification failed: %s :", + X509_verify_cert_error_string(err)); + } + + /* Clear X509_verify_cert errors */ + ERR_clear_error(); + + /* Obtain a copy of the verified chain */ + chain = X509_STORE_CTX_get1_chain(sctx); + + if (chain != NULL) { + /* Discard end entity cert from the chain */ + X509_free(sk_X509_shift(chain)); + + if ((i = sk_X509_num(chain)) > 0) { + /* Store the chain for later use */ + pkp->ca_certs[n] = chain; + } + else { + /* Discard empty chain */ + sk_X509_pop_free(chain, X509_free); + pkp->ca_certs[n] = NULL; + } + + ssl_log_xerror(SSLLOG_MARK, APLOG_DEBUG, 0, ptemp, s, inf->x509, + APLOGNO(02271) + "loaded %i intermediate CA%s for cert %i: ", + i, i == 1 ? "" : "s", n); + if (i > 0) { + int j; + for (j = 0; j < i; j++) { + ssl_log_xerror(SSLLOG_MARK, APLOG_DEBUG, 0, ptemp, s, + sk_X509_value(chain, j), APLOGNO(03039) + "%i:", j); + } + } + } + + /* get ready for next X509_STORE_CTX_init */ + X509_STORE_CTX_cleanup(sctx); + } + + X509_STORE_CTX_free(sctx); + + return APR_SUCCESS; +} + +#define MODSSL_CFG_ITEM_FREE(func, item) \ + if (item) { \ + func(item); \ + item = NULL; \ + } + +static void ssl_init_ctx_cleanup(modssl_ctx_t *mctx) +{ + MODSSL_CFG_ITEM_FREE(SSL_CTX_free, mctx->ssl_ctx); + +#ifdef HAVE_SRP + if (mctx->srp_vbase != NULL) { + SRP_VBASE_free(mctx->srp_vbase); + mctx->srp_vbase = NULL; + } +#endif +} + +static apr_status_t ssl_cleanup_proxy_ctx(void *data) +{ + modssl_ctx_t *mctx = data; + + ssl_init_ctx_cleanup(mctx); + + if (mctx->pkp->certs) { + int i = 0; + int ncerts = sk_X509_INFO_num(mctx->pkp->certs); + + if (mctx->pkp->ca_certs) { + for (i = 0; i < ncerts; i++) { + if (mctx->pkp->ca_certs[i] != NULL) { + sk_X509_pop_free(mctx->pkp->ca_certs[i], X509_free); + } + } + } + + sk_X509_INFO_pop_free(mctx->pkp->certs, X509_INFO_free); + mctx->pkp->certs = NULL; + } + + return APR_SUCCESS; +} + +static apr_status_t ssl_init_proxy_ctx(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + modssl_ctx_t *proxy) +{ + apr_status_t rv; + + if (proxy->ssl_ctx) { + /* Merged/initialized already */ + return APR_SUCCESS; + } + + apr_pool_cleanup_register(p, proxy, + ssl_cleanup_proxy_ctx, + apr_pool_cleanup_null); + + if ((rv = ssl_init_ctx(s, p, ptemp, proxy)) != APR_SUCCESS) { + return rv; + } + + if ((rv = ssl_init_proxy_certs(s, p, ptemp, proxy)) != APR_SUCCESS) { + return rv; + } + + return APR_SUCCESS; +} + +static apr_status_t ssl_init_server_ctx(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + SSLSrvConfigRec *sc, + apr_array_header_t *pphrases) +{ + apr_status_t rv; + modssl_pk_server_t *pks; +#ifdef HAVE_SSL_CONF_CMD + ssl_ctx_param_t *param = (ssl_ctx_param_t *)sc->server->ssl_ctx_param->elts; + SSL_CONF_CTX *cctx = sc->server->ssl_ctx_config; + int i; +#endif + int n; + + /* + * Check for problematic re-initializations + */ + if (sc->server->ssl_ctx) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02569) + "Illegal attempt to re-initialise SSL for server " + "(SSLEngine On should go in the VirtualHost, not in global scope.)"); + return APR_EGENERAL; + } + + /* Allow others to provide certificate files */ + pks = sc->server->pks; + n = pks->cert_files->nelts; + ap_ssl_add_cert_files(s, p, pks->cert_files, pks->key_files); + ssl_run_add_cert_files(s, p, pks->cert_files, pks->key_files); + + if (apr_is_empty_array(pks->cert_files)) { + /* does someone propose a certiciate to fall back on here? */ + ap_ssl_add_fallback_cert_files(s, p, pks->cert_files, pks->key_files); + ssl_run_add_fallback_cert_files(s, p, pks->cert_files, pks->key_files); + if (n < pks->cert_files->nelts) { + pks->service_unavailable = 1; + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10085) + "Init: %s will respond with '503 Service Unavailable' for now. There " + "are no SSL certificates configured and no other module contributed any.", + ssl_util_vhostid(p, s)); + } + } + + if (n < pks->cert_files->nelts) { + /* additionally installed certs overrides any old chain configuration */ + sc->server->cert_chain = NULL; + } + + if ((rv = ssl_init_ctx(s, p, ptemp, sc->server)) != APR_SUCCESS) { + return rv; + } + + if ((rv = ssl_init_server_certs(s, p, ptemp, sc->server, pphrases)) + != APR_SUCCESS) { + return rv; + } + +#ifdef HAVE_SSL_CONF_CMD + SSL_CONF_CTX_set_ssl_ctx(cctx, sc->server->ssl_ctx); + for (i = 0; i < sc->server->ssl_ctx_param->nelts; i++, param++) { + ERR_clear_error(); + if (SSL_CONF_cmd(cctx, param->name, param->value) <= 0) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02407) + "\"SSLOpenSSLConfCmd %s %s\" failed for %s", + param->name, param->value, sc->vhost_id); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return ssl_die(s); + } else { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02556) + "\"SSLOpenSSLConfCmd %s %s\" applied to %s", + param->name, param->value, sc->vhost_id); + } + } + + if (SSL_CONF_CTX_finish(cctx) == 0) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02547) + "SSL_CONF_CTX_finish() failed"); + SSL_CONF_CTX_free(cctx); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return ssl_die(s); + } +#endif + + if (SSL_CTX_check_private_key(sc->server->ssl_ctx) != 1) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02572) + "Failed to configure at least one certificate and key " + "for %s", sc->vhost_id); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s); + return ssl_die(s); + } + +#if defined(HAVE_OCSP_STAPLING) && defined(SSL_CTRL_SET_CURRENT_CERT) + /* + * OpenSSL 1.0.2 and later allows iterating over all SSL_CTX certs + * by means of SSL_CTX_set_current_cert. Enabling stapling at this + * (late) point makes sure that we catch both certificates loaded + * via SSLCertificateFile and SSLOpenSSLConfCmd Certificate. + */ + do { + X509 *cert; + int i = 0; + int ret = SSL_CTX_set_current_cert(sc->server->ssl_ctx, + SSL_CERT_SET_FIRST); + while (ret) { + cert = SSL_CTX_get0_certificate(sc->server->ssl_ctx); + if (!cert || !ssl_stapling_init_cert(s, p, ptemp, sc->server, + cert)) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02604) + "Unable to configure certificate %s:%d " + "for stapling", sc->vhost_id, i); + } + ret = SSL_CTX_set_current_cert(sc->server->ssl_ctx, + SSL_CERT_SET_NEXT); + i++; + } + } while(0); +#endif + +#ifdef HAVE_TLS_SESSION_TICKETS + if ((rv = ssl_init_ticket_key(s, p, ptemp, sc->server)) != APR_SUCCESS) { + return rv; + } +#endif + + SSL_CTX_set_timeout(sc->server->ssl_ctx, + sc->session_cache_timeout == UNSET ? + SSL_SESSION_CACHE_TIMEOUT : sc->session_cache_timeout); + + return APR_SUCCESS; +} + +/* + * Configure a particular server + */ +apr_status_t ssl_init_ConfigureServer(server_rec *s, + apr_pool_t *p, + apr_pool_t *ptemp, + SSLSrvConfigRec *sc, + apr_array_header_t *pphrases) +{ + SSLDirConfigRec *sdc = ap_get_module_config(s->lookup_defaults, + &ssl_module); + apr_status_t rv; + + /* Initialize the server if SSL is enabled or optional. + */ + if ((sc->enabled == SSL_ENABLED_TRUE) || (sc->enabled == SSL_ENABLED_OPTIONAL)) { + ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01914) + "Configuring server %s for SSL protocol", sc->vhost_id); + if ((rv = ssl_init_server_ctx(s, p, ptemp, sc, pphrases)) + != APR_SUCCESS) { + return rv; + } + + /* Initialize OCSP Responder certificate if OCSP enabled */ + #ifndef OPENSSL_NO_OCSP + ssl_init_ocsp_certificates(s, sc->server); + #endif + + } + + sdc->proxy->sc = sc; + if (sdc->proxy_enabled == TRUE) { + rv = ssl_init_proxy_ctx(s, p, ptemp, sdc->proxy); + if (rv != APR_SUCCESS) { + return rv; + } + } + else { + sdc->proxy_enabled = FALSE; + } + sdc->proxy_post_config = 1; + + return APR_SUCCESS; +} + +apr_status_t ssl_init_CheckServers(server_rec *base_server, apr_pool_t *p) +{ + server_rec *s; + SSLSrvConfigRec *sc; +#ifndef HAVE_TLSEXT + server_rec *ps; + apr_hash_t *table; + const char *key; + apr_ssize_t klen; + + BOOL conflict = FALSE; +#endif + + /* + * Give out warnings when a server has HTTPS configured + * for the HTTP port or vice versa + */ + for (s = base_server; s; s = s->next) { + sc = mySrvConfig(s); + + if ((sc->enabled == SSL_ENABLED_TRUE) && (s->port == DEFAULT_HTTP_PORT)) { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, + base_server, APLOGNO(01915) + "Init: (%s) You configured HTTPS(%d) " + "on the standard HTTP(%d) port!", + ssl_util_vhostid(p, s), + DEFAULT_HTTPS_PORT, DEFAULT_HTTP_PORT); + } + + if ((sc->enabled == SSL_ENABLED_FALSE) && (s->port == DEFAULT_HTTPS_PORT)) { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, + base_server, APLOGNO(01916) + "Init: (%s) You configured HTTP(%d) " + "on the standard HTTPS(%d) port!", + ssl_util_vhostid(p, s), + DEFAULT_HTTP_PORT, DEFAULT_HTTPS_PORT); + } + } + +#ifndef HAVE_TLSEXT + /* + * Give out warnings when more than one SSL-aware virtual server uses the + * same IP:port and an OpenSSL version without support for TLS extensions + * (SNI in particular) is used. + */ + table = apr_hash_make(p); + + for (s = base_server; s; s = s->next) { + char *addr; + + sc = mySrvConfig(s); + + if (!((sc->enabled == SSL_ENABLED_TRUE) && s->addrs)) { + continue; + } + + apr_sockaddr_ip_get(&addr, s->addrs->host_addr); + key = apr_psprintf(p, "%s:%u", addr, s->addrs->host_port); + klen = strlen(key); + + if ((ps = (server_rec *)apr_hash_get(table, key, klen))) { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, base_server, APLOGNO(02662) + "Init: SSL server IP/port conflict: " + "%s (%s:%d) vs. %s (%s:%d)", + ssl_util_vhostid(p, s), + (s->defn_name ? s->defn_name : "unknown"), + s->defn_line_number, + ssl_util_vhostid(p, ps), + (ps->defn_name ? ps->defn_name : "unknown"), + ps->defn_line_number); + conflict = TRUE; + continue; + } + + apr_hash_set(table, key, klen, s); + } + + if (conflict) { + ap_log_error(APLOG_MARK, APLOG_WARNING, 0, base_server, APLOGNO(01917) + "Init: Name-based SSL virtual hosts require " + "an OpenSSL version with support for TLS extensions " + "(RFC 6066 - Server Name Indication / SNI), " + "but the currently used library version (%s) is " + "lacking this feature", MODSSL_LIBRARY_DYNTEXT); + } +#endif + + return APR_SUCCESS; +} + +int ssl_proxy_section_post_config(apr_pool_t *p, apr_pool_t *plog, + apr_pool_t *ptemp, server_rec *s, + ap_conf_vector_t *section_config) +{ + SSLDirConfigRec *sdc = ap_get_module_config(s->lookup_defaults, + &ssl_module); + SSLDirConfigRec *pdc = ap_get_module_config(section_config, + &ssl_module); + if (pdc) { + pdc->proxy->sc = mySrvConfig(s); + ssl_config_proxy_merge(p, sdc, pdc); + if (pdc->proxy_enabled) { + apr_status_t rv; + + rv = ssl_init_proxy_ctx(s, p, ptemp, pdc->proxy); + if (rv != APR_SUCCESS) { + return !OK; + } + + rv = ssl_run_init_server(s, p, 1, pdc->proxy->ssl_ctx); + if (rv != APR_SUCCESS) { + return !OK; + } + } + pdc->proxy_post_config = 1; + } + return OK; +} + +static int ssl_init_FindCAList_X509NameCmp(const X509_NAME * const *a, + const X509_NAME * const *b) +{ + return(X509_NAME_cmp(*a, *b)); +} + +static void ssl_init_PushCAList(STACK_OF(X509_NAME) *ca_list, + server_rec *s, apr_pool_t *ptemp, + const char *file) +{ + int n; + STACK_OF(X509_NAME) *sk; + + sk = (STACK_OF(X509_NAME) *) + SSL_load_client_CA_file(file); + + if (!sk) { + return; + } + + for (n = 0; n < sk_X509_NAME_num(sk); n++) { + X509_NAME *name = sk_X509_NAME_value(sk, n); + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02209) + "CA certificate: %s", + modssl_X509_NAME_to_string(ptemp, name, 0)); + + /* + * note that SSL_load_client_CA_file() checks for duplicates, + * but since we call it multiple times when reading a directory + * we must also check for duplicates ourselves. + */ + + if (sk_X509_NAME_find(ca_list, name) < 0) { + /* this will be freed when ca_list is */ + sk_X509_NAME_push(ca_list, name); + } + else { + /* need to free this ourselves, else it will leak */ + X509_NAME_free(name); + } + } + + sk_X509_NAME_free(sk); +} + +static apr_status_t ssl_init_ca_cert_path(server_rec *s, + apr_pool_t *ptemp, + const char *path, + STACK_OF(X509_NAME) *ca_list, + STACK_OF(X509_INFO) *xi_list) +{ + apr_dir_t *dir; + apr_finfo_t direntry; + apr_int32_t finfo_flags = APR_FINFO_TYPE|APR_FINFO_NAME; + + if (!path || (!ca_list && !xi_list) || + (apr_dir_open(&dir, path, ptemp) != APR_SUCCESS)) { + return APR_EGENERAL; + } + + while ((apr_dir_read(&direntry, finfo_flags, dir)) == APR_SUCCESS) { + const char *file; + if (direntry.filetype == APR_DIR) { + continue; /* don't try to load directories */ + } + file = apr_pstrcat(ptemp, path, "/", direntry.name, NULL); + if (ca_list) { + ssl_init_PushCAList(ca_list, s, ptemp, file); + } + if (xi_list) { + load_x509_info(ptemp, xi_list, file); + } + } + + apr_dir_close(dir); + + return APR_SUCCESS; +} + +STACK_OF(X509_NAME) *ssl_init_FindCAList(server_rec *s, + apr_pool_t *ptemp, + const char *ca_file, + const char *ca_path) +{ + STACK_OF(X509_NAME) *ca_list; + + /* + * Start with a empty stack/list where new + * entries get added in sorted order. + */ + ca_list = sk_X509_NAME_new(ssl_init_FindCAList_X509NameCmp); + + /* + * Process CA certificate bundle file + */ + if (ca_file) { + ssl_init_PushCAList(ca_list, s, ptemp, ca_file); + /* + * If ca_list is still empty after trying to load ca_file + * then the file failed to load, and users should hear about that. + */ + if (sk_X509_NAME_num(ca_list) == 0) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02210) + "Failed to load SSLCACertificateFile: %s", ca_file); + ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s); + } + } + + /* + * Process CA certificate path files + */ + if (ca_path && + ssl_init_ca_cert_path(s, ptemp, + ca_path, ca_list, NULL) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02211) + "Failed to open Certificate Path `%s'", ca_path); + sk_X509_NAME_pop_free(ca_list, X509_NAME_free); + return NULL; + } + + /* + * Cleanup + */ + (void) sk_X509_NAME_set_cmp_func(ca_list, NULL); + + return ca_list; +} + +void ssl_init_Child(apr_pool_t *p, server_rec *s) +{ + SSLModConfigRec *mc = myModConfig(s); + mc->pid = getpid(); /* only call getpid() once per-process */ + + /* XXX: there should be an ap_srand() function */ + srand((unsigned int)time(NULL)); + + /* open the mutex lockfile */ + ssl_mutex_reinit(s, p); +#ifdef HAVE_OCSP_STAPLING + ssl_stapling_mutex_reinit(s, p); +#endif +} + +apr_status_t ssl_init_ModuleKill(void *data) +{ + SSLSrvConfigRec *sc; + server_rec *base_server = (server_rec *)data; + server_rec *s; + + /* + * Drop the session cache and mutex + */ + ssl_scache_kill(base_server); + + /* + * Free the non-pool allocated structures + * in the per-server configurations + */ + for (s = base_server; s; s = s->next) { + sc = mySrvConfig(s); + + ssl_init_ctx_cleanup(sc->server); + + /* Not Sure but possibly clear X509 trusted cert file */ + #ifndef OPENSSL_NO_OCSP + sk_X509_pop_free(sc->server->ocsp_certs, X509_free); + #endif + + } + +#if MODSSL_USE_OPENSSL_PRE_1_1_API + free_dh_params(); +#else + free_bio_methods(); +#endif + + return APR_SUCCESS; +} |