Changeset 68b5156 in mod_gnutls

Timestamp:

Dec 17, 2018, 1:12:17 PM (4 weeks ago)

Author:

Fiona Klute <fiona.klute@…>

Branches:

master

Children:

0378c22

Parents:

0fcba60

Message:

Move proxy-only functions from gnutls_hooks.c to a dedicated file

Location:

src

Files:

• Makefile.am (modified) (1 diff)
• gnutls_hooks.c (modified) (3 diffs)
• gnutls_proxy.c (added)
• gnutls_proxy.h (added)

src/Makefile.am

@@ -7 +7 @@
 
 mod_gnutls_la_SOURCES = mod_gnutls.c gnutls_io.c gnutls_cache.c \
-        gnutls_config.c gnutls_hooks.c gnutls_ocsp.c gnutls_sni.c \
-        gnutls_util.c gnutls_watchdog.c
+        gnutls_config.c gnutls_hooks.c gnutls_ocsp.c gnutls_proxy.c \
+        gnutls_sni.c gnutls_util.c gnutls_watchdog.c
 mod_gnutls_la_CFLAGS = -Wall ${MODULE_CFLAGS}
 mod_gnutls_la_LDFLAGS = -module -avoid-version ${MODULE_LIBS}
-noinst_HEADERS = gnutls_cache.h gnutls_config.h gnutls_ocsp.h gnutls_sni.h \
-        gnutls_util.h gnutls_watchdog.h
+noinst_HEADERS = gnutls_cache.h gnutls_config.h gnutls_ocsp.h \
+        gnutls_proxy.h gnutls_sni.h gnutls_util.h gnutls_watchdog.h
 
 apmodpkglib_LTLIBRARIES = mod_gnutls.la

src/gnutls_hooks.c

@@ -23 +23 @@
 #include "gnutls_config.h"
 #include "gnutls_ocsp.h"
+#include "gnutls_proxy.h"
 #include "gnutls_sni.h"
 #include "gnutls_util.h"
@@ -67 +68 @@
 static const char* mgs_x509_construct_uid(request_rec * pool, gnutls_x509_crt_t cert);
 #endif
-static int load_proxy_x509_credentials(apr_pool_t *pconf, apr_pool_t *ptemp, server_rec *s)
-    __attribute__((nonnull));
 
 /* Pool Cleanup Function */
@@ -2071 +2070 @@
     return OK;
 }
-
-
-
-/*
- * Callback to check the server certificate for proxy HTTPS
- * connections, to be used with
- * gnutls_certificate_set_verify_function.
-
- * Returns: 0 if certificate check was successful (certificate
- * trusted), non-zero otherwise (error during check or untrusted
- * certificate).
- */
-static int gtls_check_server_cert(gnutls_session_t session)
-{
-    mgs_handle_t *ctxt = (mgs_handle_t *) gnutls_session_get_ptr(session);
-    unsigned int status;
-
-    /* Get peer hostname from a note left by mod_proxy */
-    const char *peer_hostname =
-        apr_table_get(ctxt->c->notes, PROXY_SNI_NOTE);
-    if (peer_hostname == NULL)
-        ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
-                      "%s: " PROXY_SNI_NOTE " NULL, cannot check "
-                      "peer's hostname", __func__);
-
-    /* Verify certificate, including hostname match. Should
-     * peer_hostname be NULL for some reason, the name is not
-     * checked. */
-    int err = gnutls_certificate_verify_peers3(session, peer_hostname,
-                                               &status);
-    if (err != GNUTLS_E_SUCCESS)
-    {
-        ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
-                      "%s: server certificate check failed: %s (%d)",
-                      __func__, gnutls_strerror(err), err);
-        return err;
-    }
-
-    if (status == 0)
-        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
-                      "%s: server certificate is trusted.",
-                      __func__);
-    else
-    {
-        gnutls_datum_t out;
-        /* GNUTLS_CRT_X509: ATM, only X509 is supported for proxy
-         * certs 0: according to function API, the last argument
-         * should be 0 */
-        err = gnutls_certificate_verification_status_print(status,
-                                                           GNUTLS_CRT_X509,
-                                                           &out, 0);
-        if (err != GNUTLS_E_SUCCESS)
-            ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, ctxt->c,
-                          "%s: server verify print failed: %s (%d)",
-                          __func__, gnutls_strerror(err), err);
-        else
-            ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
-                          "%s: %s",
-                          __func__, out.data);
-        gnutls_free(out.data);
-    }
-
-    return status;
-}
-
-
-
-static apr_status_t cleanup_proxy_x509_credentials(void *arg)
-{
-    mgs_srvconf_rec *sc = (mgs_srvconf_rec *) arg;
-
-    if (sc->proxy_x509_creds)
-    {
-        /* This implicitly releases the associated trust list
-         * sc->proxy_x509_tl, too. */
-        gnutls_certificate_free_credentials(sc->proxy_x509_creds);
-        sc->proxy_x509_creds = NULL;
-        sc->proxy_x509_tl = NULL;
-    }
-
-    if (sc->anon_client_creds)
-    {
-        gnutls_anon_free_client_credentials(sc->anon_client_creds);
-        sc->anon_client_creds = NULL;
-    }
-
-    /* Deinit proxy priorities only if set from
-     * sc->proxy_priorities_str. Otherwise the server is using the
-     * default global priority cache, which must not be deinitialized
-     * here. */
-    if (sc->proxy_priorities_str && sc->proxy_priorities)
-    {
-        gnutls_priority_deinit(sc->proxy_priorities);
-        sc->proxy_priorities = NULL;
-    }
-
-    return APR_SUCCESS;
-}
-
-
-
-static apr_status_t load_proxy_x509_credentials(apr_pool_t *pconf,
-                                                apr_pool_t *ptemp,
-                                                server_rec *s)
-{
-    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
-        ap_get_module_config(s->module_config, &gnutls_module);
-
-    if (sc == NULL)
-        return APR_EGENERAL;
-
-    apr_status_t ret = APR_EINIT;
-    int err = GNUTLS_E_SUCCESS;
-
-    /* Cleanup function for the GnuTLS structures allocated below */
-    apr_pool_cleanup_register(pconf, sc, cleanup_proxy_x509_credentials,
-                              apr_pool_cleanup_null);
-
-    /* Function pool, gets destroyed before exit. */
-    apr_pool_t *pool;
-    ret = apr_pool_create(&pool, ptemp);
-    if (ret != APR_SUCCESS)
-    {
-        ap_log_error(APLOG_MARK, APLOG_ERR, ret, s,
-                     "%s: failed to allocate function memory pool.", __func__);
-        return ret;
-    }
-
-    /* allocate credentials structures */
-    err = gnutls_certificate_allocate_credentials(&sc->proxy_x509_creds);
-    if (err != GNUTLS_E_SUCCESS)
-    {
-        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                     "%s: Failed to initialize proxy credentials: (%d) %s",
-                     __func__, err, gnutls_strerror(err));
-        return APR_EGENERAL;
-    }
-    err = gnutls_anon_allocate_client_credentials(&sc->anon_client_creds);
-    if (err != GNUTLS_E_SUCCESS)
-    {
-        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                     "%s: Failed to initialize anon credentials for proxy: "
-                     "(%d) %s", __func__, err, gnutls_strerror(err));
-        return APR_EGENERAL;
-    }
-
-    /* Check if the proxy priorities have been set, fail immediately
-     * if not */
-    if (sc->proxy_priorities_str == NULL)
-    {
-        ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
-                     "No GnuTLSProxyPriorities directive for host '%s:%d', "
-                     "using default '%s'.",
-                     s->server_hostname, s->addrs->host_port,
-                     MGS_DEFAULT_PRIORITY);
-        sc->proxy_priorities = mgs_get_default_prio();
-    }
-    else
-    {
-        /* parse proxy priorities */
-        const char *err_pos = NULL;
-        err = gnutls_priority_init(&sc->proxy_priorities,
-                                   sc->proxy_priorities_str, &err_pos);
-        if (err != GNUTLS_E_SUCCESS)
-        {
-            if (ret == GNUTLS_E_INVALID_REQUEST)
-                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                             "%s: Syntax error parsing proxy priorities "
-                             "string at: %s",
-                             __func__, err_pos);
-            else
-                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                             "Error setting proxy priorities: %s (%d)",
-                             gnutls_strerror(err), err);
-            ret = APR_EGENERAL;
-        }
-    }
-
-    /* load certificate and key for client auth, if configured */
-    if (sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
-    {
-        char* cert_file = ap_server_root_relative(pool,
-                                                  sc->proxy_x509_cert_file);
-        char* key_file = ap_server_root_relative(pool,
-                                                 sc->proxy_x509_key_file);
-        err = gnutls_certificate_set_x509_key_file(sc->proxy_x509_creds,
-                                                   cert_file,
-                                                   key_file,
-                                                   GNUTLS_X509_FMT_PEM);
-        if (err != GNUTLS_E_SUCCESS)
-        {
-            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                         "%s: loading proxy client credentials failed: %s (%d)",
-                         __func__, gnutls_strerror(err), err);
-            ret = APR_EGENERAL;
-        }
-    }
-    else if (!sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
-    {
-        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
-                     "%s: proxy key file not set!", __func__);
-        ret = APR_EGENERAL;
-    }
-    else if (!sc->proxy_x509_cert_file && sc->proxy_x509_key_file)
-    {
-        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
-                     "%s: proxy certificate file not set!", __func__);
-        ret = APR_EGENERAL;
-    }
-    else
-        /* if both key and cert are NULL, client auth is not used */
-        ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
-                     "%s: no client credentials for proxy", __func__);
-
-    /* must be set if the server certificate is to be checked */
-    if (sc->proxy_x509_ca_file)
-    {
-        /* initialize the trust list */
-        err = gnutls_x509_trust_list_init(&sc->proxy_x509_tl, 0);
-        if (err != GNUTLS_E_SUCCESS)
-        {
-            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                         "%s: gnutls_x509_trust_list_init failed: %s (%d)",
-                         __func__, gnutls_strerror(err), err);
-            ret = APR_EGENERAL;
-        }
-
-        char* ca_file = ap_server_root_relative(pool,
-                                                sc->proxy_x509_ca_file);
-        /* if no CRL is used, sc->proxy_x509_crl_file is NULL */
-        char* crl_file = NULL;
-        if (sc->proxy_x509_crl_file)
-            crl_file = ap_server_root_relative(pool,
-                                               sc->proxy_x509_crl_file);
-
-        /* returns number of loaded elements */
-        err = gnutls_x509_trust_list_add_trust_file(sc->proxy_x509_tl,
-                                                    ca_file,
-                                                    crl_file,
-                                                    GNUTLS_X509_FMT_PEM,
-                                                    0 /* tl_flags */,
-                                                    0 /* tl_vflags */);
-        if (err > 0)
-            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
-                         "%s: proxy CA trust list: %d structures loaded",
-                         __func__, err);
-        else if (err == 0)
-            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
-                         "%s: proxy CA trust list is empty (%d)",
-                         __func__, err);
-        else /* err < 0 */
-        {
-            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                         "%s: error loading proxy CA trust list: %s (%d)",
-                         __func__, gnutls_strerror(err), err);
-            ret = APR_EGENERAL;
-        }
-
-        /* attach trust list to credentials */
-        gnutls_certificate_set_trust_list(sc->proxy_x509_creds,
-                                          sc->proxy_x509_tl, 0);
-    }
-    else
-        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
-                     "%s: no CA trust list for proxy connections, "
-                     "TLS connections will fail!", __func__);
-
-    gnutls_certificate_set_verify_function(sc->proxy_x509_creds,
-                                           gtls_check_server_cert);
-    apr_pool_destroy(pool);
-    return ret;
-}