File 2.4.17-protocols.patch of Package apache2

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File 2.4.17-protocols.patch of Package apache2 (Revision 98aa7366c00dabca7f9a3ed12fa6beca)

Currently displaying revision 98aa7366c00dabca7f9a3ed12fa6beca , Show latest

--- include/httpd.h.orig
+++ include/httpd.h
@@ -1167,6 +1167,9 @@ struct conn_rec {
 #if APR_HAS_THREADS
     apr_thread_t *current_thread;
 #endif
+
+    /** The "real" master connection. NULL if I am the master. */
+    conn_rec *master;
 };
 
 /**
--- include/http_protocol.h.orig
+++ include/http_protocol.h
@@ -782,7 +782,27 @@ AP_DECLARE_HOOK(int,protocol_switch,(con
  * @return The identifier of the protocol in place or NULL
  */
 AP_DECLARE_HOOK(const char *,protocol_get,(const conn_rec *c))
-    
+
+/**
+ * Get the protocols that the connection and optional request may
+ * upgrade to - besides the protocol currently active on the connection. These
+ * values may be used to announce to a client what choices it has.
+ *
+ * If report_all == 0, only protocols more preferable than the one currently
+ * being used, are reported. Otherwise, all available protocols beside the
+ * current one are being reported.
+ *
+ * @param c The current connection
+ * @param r The current request or NULL
+ * @param s The server/virtual host selected or NULL
+ * @param report_all include also protocols less preferred than the current one
+ * @param pupgrades on return, possible protocols to upgrade to in descending order 
+ *                 of preference. Maybe NULL if none are available.    
+ */
+AP_DECLARE(apr_status_t) ap_get_protocol_upgrades(conn_rec *c, request_rec *r, 
+                                                  server_rec *s, int report_all, 
+                                                  const apr_array_header_t **pupgrades);
+                                                  
 /**
  * Select a protocol for the given connection and optional request. Will return
  * the protocol identifier selected which may be the protocol already in place
@@ -833,6 +853,23 @@ AP_DECLARE(apr_status_t) ap_switch_proto
  */
 AP_DECLARE(const char *) ap_get_protocol(conn_rec *c);
 
+/**
+ * Check if the given protocol is an allowed choice on the given
+ * combination of connection, request and server. 
+ *
+ * When server is NULL, it is taken from request_rec, unless
+ * request_rec is NULL. Then it is taken from the connection base
+ * server.
+ *
+ * @param c The current connection
+ * @param r The current request or NULL
+ * @param s The server/virtual host selected or NULL
+ * @param protocol the protocol to switch to
+ * @return != 0 iff protocol is allowed
+ */
+AP_DECLARE(int) ap_is_allowed_protocol(conn_rec *c, request_rec *r,
+                                       server_rec *s, const char *protocol);
+
 /** @see ap_bucket_type_error */
 typedef struct ap_bucket_error ap_bucket_error;
 
--- include/ap_mmn.h.orig
+++ include/ap_mmn.h
@@ -456,6 +456,7 @@
  *                          ap_select_protocol(), ap_switch_protocol(),
  *                          ap_get_protocol(). Add HTTP_MISDIRECTED_REQUEST.
  *                          Added ap_parse_token_list_strict() to httpd.h
+ * 20120211.52 (2.4.17-dev) Add master conn_rec* member in conn_rec.
  */
 
 #define MODULE_MAGIC_COOKIE 0x41503234UL /* "AP24" */
@@ -463,7 +464,7 @@
 #ifndef MODULE_MAGIC_NUMBER_MAJOR
 #define MODULE_MAGIC_NUMBER_MAJOR 20120211
 #endif
-#define MODULE_MAGIC_NUMBER_MINOR 51                   /* 0...n */
+#define MODULE_MAGIC_NUMBER_MINOR 52                   /* 0...n */
 
 /**
  * Determine if the server's current MODULE_MAGIC_NUMBER is at least a
--- server/core.c.orig
+++ server/core.c
@@ -4995,8 +4995,15 @@ static void core_dump_config(apr_pool_t
 static int core_upgrade_handler(request_rec *r)
 {
     conn_rec *c = r->connection;
-    const char *upgrade = apr_table_get(r->headers_in, "Upgrade");
+    const char *upgrade;
 
+    if (c->master) {
+        /* Not possible to perform an HTTP/1.1 upgrade from a slave
+         * connection. */
+        return DECLINED;
+    }
+    
+    upgrade = apr_table_get(r->headers_in, "Upgrade");
     if (upgrade && *upgrade) {
         const char *conn = apr_table_get(r->headers_in, "Connection");
         if (ap_find_token(r->pool, conn, "upgrade")) {
@@ -5011,8 +5018,7 @@ static int core_upgrade_handler(request_
             }
             
             if (offers && offers->nelts > 0) {
-                const char *protocol = ap_select_protocol(c, r, r->server,
-                                                          offers);
+                const char *protocol = ap_select_protocol(c, r, NULL, offers);
                 if (protocol && strcmp(protocol, ap_get_protocol(c))) {
                     ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02909)
                                   "Upgrade selects '%s'", protocol);
@@ -5034,6 +5040,19 @@ static int core_upgrade_handler(request_
             }
         }
     }
+    else if (!c->keepalives) {
+        /* first request on a master connection, if we have protocols other
+         * than the current one enabled here, announce them to the
+         * client. If the client is already talking a protocol with requests
+         * on slave connections, leave it be. */
+        const apr_array_header_t *upgrades;
+        ap_get_protocol_upgrades(c, r, NULL, 0, &upgrades);
+        if (upgrades && upgrades->nelts > 0) {
+            char *protocols = apr_array_pstrcat(r->pool, upgrades, ',');
+            apr_table_setn(r->headers_out, "Upgrade", protocols);
+            apr_table_setn(r->headers_out, "Connection", "Upgrade");
+        }
+    }
     
     return DECLINED;
 }
--- server/protocol.c.orig
+++ server/protocol.c
@@ -1823,15 +1823,61 @@ AP_DECLARE(const char *) ap_get_protocol
     return protocol? protocol : AP_PROTOCOL_HTTP1;
 }
 
+AP_DECLARE(apr_status_t) ap_get_protocol_upgrades(conn_rec *c, request_rec *r, 
+                                                  server_rec *s, int report_all, 
+                                                  const apr_array_header_t **pupgrades)
+{
+    apr_pool_t *pool = r? r->pool : c->pool;
+    core_server_config *conf;
+    const char *existing;
+    apr_array_header_t *upgrades = NULL;
+
+    if (!s) {
+        s = (r? r->server : c->base_server);
+    }
+    conf = ap_get_core_module_config(s->module_config);
+    
+    if (conf->protocols->nelts > 0) {
+        existing = ap_get_protocol(c);
+        if (conf->protocols->nelts > 1 
+            || !ap_array_str_contains(conf->protocols, existing)) {
+            int i;
+            
+            /* possibly more than one choice or one, but not the
+             * existing. (TODO: maybe 426 and Upgrade then?) */
+            upgrades = apr_array_make(pool, conf->protocols->nelts + 1, 
+                                      sizeof(char *));
+            for (i = 0; i < conf->protocols->nelts; i++) {
+                const char *p = APR_ARRAY_IDX(conf->protocols, i, char *);
+                if (strcmp(existing, p)) {
+                    /* not the one we have and possible, add in this order */
+                    APR_ARRAY_PUSH(upgrades, const char*) = p;
+                }
+                else if (!report_all) {
+                    break;
+                }
+            }
+        }
+    }
+    
+    *pupgrades = upgrades;
+    return APR_SUCCESS;
+}
+
 AP_DECLARE(const char *) ap_select_protocol(conn_rec *c, request_rec *r, 
                                             server_rec *s,
                                             const apr_array_header_t *choices)
 {
     apr_pool_t *pool = r? r->pool : c->pool;
-    core_server_config *conf = ap_get_core_module_config(s->module_config);
+    core_server_config *conf;
     const char *protocol = NULL, *existing;
     apr_array_header_t *proposals;
 
+    if (!s) {
+        s = (r? r->server : c->base_server);
+    }
+    conf = ap_get_core_module_config(s->module_config);
+    
     if (APLOGcdebug(c)) {
         const char *p = apr_array_pstrcat(pool, conf->protocols, ',');
         ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, 
@@ -1937,6 +1983,22 @@ AP_DECLARE(apr_status_t) ap_switch_proto
     }    
 }
 
+AP_DECLARE(int) ap_is_allowed_protocol(conn_rec *c, request_rec *r,
+                                       server_rec *s, const char *protocol)
+{
+    core_server_config *conf;
+
+    if (!s) {
+        s = (r? r->server : c->base_server);
+    }
+    conf = ap_get_core_module_config(s->module_config);
+    
+    if (conf->protocols->nelts > 0) {
+        return ap_array_str_contains(conf->protocols, protocol);
+    }
+    return !strcmp(AP_PROTOCOL_HTTP1, protocol);
+}
+
 
 AP_IMPLEMENT_HOOK_VOID(pre_read_request,
                        (request_rec *r, conn_rec *c),
--- modules/ssl/mod_ssl.c.orig
+++ modules/ssl/mod_ssl.c
@@ -377,6 +377,7 @@ static int ssl_hook_pre_config(apr_pool_
 static SSLConnRec *ssl_init_connection_ctx(conn_rec *c)
 {
     SSLConnRec *sslconn = myConnConfig(c);
+    SSLSrvConfigRec *sc;
 
     if (sslconn) {
         return sslconn;
@@ -386,6 +387,8 @@ static SSLConnRec *ssl_init_connection_c
 
     sslconn->server = c->base_server;
     sslconn->verify_depth = UNSET;
+    sc = mySrvConfig(c->base_server);
+    sslconn->cipher_suite = sc->server->auth.cipher_suite;
 
     myConnConfigSet(c, sslconn);
 
@@ -525,6 +528,7 @@ static apr_port_t ssl_hook_default_port(
 
 static int ssl_hook_pre_connection(conn_rec *c, void *csd)
 {
+
     SSLSrvConfigRec *sc;
     SSLConnRec *sslconn = myConnConfig(c);
 
@@ -537,8 +541,8 @@ static int ssl_hook_pre_connection(conn_
     /*
      * Immediately stop processing if SSL is disabled for this connection
      */
-    if (!(sc && (sc->enabled == SSL_ENABLED_TRUE ||
-                 (sslconn && sslconn->is_proxy))))
+    if (c->master || !(sc && (sc->enabled == SSL_ENABLED_TRUE ||
+                              (sslconn && sslconn->is_proxy))))
     {
         return DECLINED;
     }
@@ -566,6 +570,26 @@ static int ssl_hook_pre_connection(conn_
     return ssl_init_ssl_connection(c, NULL);
 }
 
+static int ssl_hook_process_connection(conn_rec* c)
+{
+    SSLConnRec *sslconn = myConnConfig(c);
+
+    if (sslconn && !sslconn->disabled) {
+        /* On an active SSL connection, let the input filters initialize
+         * themselves which triggers the handshake, which again triggers
+         * all kinds of useful things such as SNI and ALPN.
+         */
+        apr_bucket_brigade* temp;
+
+        temp = apr_brigade_create(c->pool, c->bucket_alloc);
+        ap_get_brigade(c->input_filters, temp,
+                       AP_MODE_INIT, APR_BLOCK_READ, 0);
+        apr_brigade_destroy(temp);
+    }
+    
+    return DECLINED;
+}
+
 /*
  *  the module registration phase
  */
@@ -579,6 +603,8 @@ static void ssl_register_hooks(apr_pool_
     ssl_io_filter_register(p);
 
     ap_hook_pre_connection(ssl_hook_pre_connection,NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_process_connection(ssl_hook_process_connection, 
+                                                   NULL, NULL, APR_HOOK_MIDDLE);
     ap_hook_test_config   (ssl_hook_ConfigTest,    NULL,NULL, APR_HOOK_MIDDLE);
     ap_hook_post_config   (ssl_init_Module,        NULL,NULL, APR_HOOK_MIDDLE);
     ap_hook_http_scheme   (ssl_hook_http_scheme,   NULL,NULL, APR_HOOK_MIDDLE);
--- modules/ssl/ssl_private.h.orig
+++ modules/ssl/ssl_private.h
@@ -460,6 +460,8 @@ typedef struct {
     } reneg_state;
 
     server_rec *server;
+    
+    const char *cipher_suite; /* cipher suite used in last reneg */
 } SSLConnRec;
 
 /* BIG FAT WARNING: SSLModConfigRec has unusual memory lifetime: it is
--- modules/ssl/ssl_engine_io.c.orig
+++ modules/ssl/ssl_engine_io.c
@@ -298,9 +298,6 @@ typedef struct {
     apr_pool_t *pool;
     char buffer[AP_IOBUFSIZE];
     ssl_filter_ctx_t *filter_ctx;
-#ifdef HAVE_TLS_ALPN
-    int alpn_finished;  /* 1 if ALPN has finished, 0 otherwise */
-#endif
 } bio_filter_in_ctx_t;
 
 /*
@@ -1418,41 +1415,6 @@ static apr_status_t ssl_io_filter_input(
         APR_BRIGADE_INSERT_TAIL(bb, bucket);
     }
 
-#ifdef HAVE_TLS_ALPN
-    /* By this point, Application-Layer Protocol Negotiation (ALPN) should be 
-     * completed (if our version of OpenSSL supports it). If we haven't already, 
-     * find out which protocol was decided upon and inform other modules 
-     * by calling alpn_proto_negotiated_hook. 
-     */
-    if (!inctx->alpn_finished) {
-        SSLConnRec *sslconn = myConnConfig(f->c);
-        const unsigned char *next_proto = NULL;
-        unsigned next_proto_len = 0;
-        const char *protocol;
-
-        SSL_get0_alpn_selected(inctx->ssl, &next_proto, &next_proto_len);
-        if (next_proto && next_proto_len) {
-            protocol = apr_pstrmemdup(f->c->pool, (const char *)next_proto,
-                                       next_proto_len);
-            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, f->c,
-                          APLOGNO(02836) "ALPN selected protocol: '%s'",
-                          protocol);
-            
-            if (strcmp(protocol, ap_get_protocol(f->c))) {
-                status = ap_switch_protocol(f->c, NULL, sslconn->server,
-                                            protocol);
-                if (status != APR_SUCCESS) {
-                    ap_log_cerror(APLOG_MARK, APLOG_ERR, status, f->c,
-                                  APLOGNO(02908) "protocol switch to '%s' failed",
-                                  protocol);
-                    return status;
-                }
-            }
-        }
-        inctx->alpn_finished = 1;
-    }
-#endif
-
     return APR_SUCCESS;
 }
 
@@ -1934,9 +1896,6 @@ static void ssl_io_input_add_filter(ssl_
     inctx->block = APR_BLOCK_READ;
     inctx->pool = c->pool;
     inctx->filter_ctx = filter_ctx;
-#ifdef HAVE_TLS_ALPN
-    inctx->alpn_finished = 0;
-#endif
 }
 
 /* The request_rec pointer is passed in here only to ensure that the
--- modules/ssl/ssl_engine_vars.c.orig
+++ modules/ssl/ssl_engine_vars.c
@@ -39,7 +39,7 @@
 **  _________________________________________________________________
 */
 
-static char *ssl_var_lookup_ssl(apr_pool_t *p, conn_rec *c, request_rec *r, char *var);
+static char *ssl_var_lookup_ssl(apr_pool_t *p, SSLConnRec *sslconn, request_rec *r, char *var);
 static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, request_rec *r, X509 *xs, char *var);
 static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, char *var);
 static char *ssl_var_lookup_ssl_cert_san(apr_pool_t *p, X509 *xs, char *var);
@@ -49,8 +49,8 @@ static char *ssl_var_lookup_ssl_cert_ser
 static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var);
 static char *ssl_var_lookup_ssl_cert_rfc4523_cea(apr_pool_t *p, SSL *ssl);
 static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs);
-static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, conn_rec *c);
-static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, conn_rec *c, char *var);
+static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, SSLConnRec *sslconn);
+static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, SSLConnRec *sslconn, char *var);
 static void  ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize);
 static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var);
 static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl);
@@ -77,7 +77,7 @@ static const char *expr_var_fn(ap_expr_e
     char *var = (char *)data;
     SSLConnRec *sslconn = myConnConfig(ctx->c);
 
-    return sslconn ? ssl_var_lookup_ssl(ctx->p, ctx->c, ctx->r, var) : NULL;
+    return sslconn ? ssl_var_lookup_ssl(ctx->p, sslconn, ctx->r, var) : NULL;
 }
 
 static int ssl_expr_lookup(ap_expr_lookup_parms *parms)
@@ -245,9 +245,13 @@ char *ssl_var_lookup(apr_pool_t *p, serv
      */
     if (result == NULL && c != NULL) {
         SSLConnRec *sslconn = myConnConfig(c);
+        if (!(sslconn && sslconn->ssl) && c->master) {
+            /* use master connection if no SSL defined here */
+            sslconn = myConnConfig(c->master);
+        }
         if (strlen(var) > 4 && strcEQn(var, "SSL_", 4)
             && sslconn && sslconn->ssl)
-            result = ssl_var_lookup_ssl(p, c, r, var+4);
+            result = ssl_var_lookup_ssl(p, sslconn, r, var+4);
         else if (strcEQ(var, "HTTPS")) {
             if (sslconn && sslconn->ssl)
                 result = "on";
@@ -317,10 +321,9 @@ char *ssl_var_lookup(apr_pool_t *p, serv
     return (char *)result;
 }
 
-static char *ssl_var_lookup_ssl(apr_pool_t *p, conn_rec *c, request_rec *r,
-                                char *var)
+static char *ssl_var_lookup_ssl(apr_pool_t *p, SSLConnRec *sslconn, 
+                                request_rec *r, char *var)
 {
-    SSLConnRec *sslconn = myConnConfig(c);
     char *result;
     X509 *xs;
     STACK_OF(X509) *sk;
@@ -360,7 +363,7 @@ static char *ssl_var_lookup_ssl(apr_pool
             result = "Initial";
     }
     else if (ssl != NULL && strlen(var) >= 6 && strcEQn(var, "CIPHER", 6)) {
-        result = ssl_var_lookup_ssl_cipher(p, c, var+6);
+        result = ssl_var_lookup_ssl_cipher(p, sslconn, var+6);
     }
     else if (ssl != NULL && strlen(var) > 18 && strcEQn(var, "CLIENT_CERT_CHAIN_", 18)) {
         sk = SSL_get_peer_cert_chain(ssl);
@@ -370,7 +373,7 @@ static char *ssl_var_lookup_ssl(apr_pool
         result = ssl_var_lookup_ssl_cert_rfc4523_cea(p, ssl);
     }
     else if (ssl != NULL && strcEQ(var, "CLIENT_VERIFY")) {
-        result = ssl_var_lookup_ssl_cert_verify(p, c);
+        result = ssl_var_lookup_ssl_cert_verify(p, sslconn);
     }
     else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "CLIENT_", 7)) {
         if ((xs = SSL_get_peer_certificate(ssl)) != NULL) {
@@ -779,9 +782,8 @@ static char *ssl_var_lookup_ssl_cert_PEM
     return result;
 }
 
-static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, conn_rec *c)
+static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, SSLConnRec *sslconn)
 {
-    SSLConnRec *sslconn = myConnConfig(c);
     char *result;
     long vrc;
     const char *verr;
@@ -815,9 +817,8 @@ static char *ssl_var_lookup_ssl_cert_ver
     return result;
 }
 
-static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, conn_rec *c, char *var)
+static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, SSLConnRec *sslconn, char *var)
 {
-    SSLConnRec *sslconn = myConnConfig(c);
     char *result;
     BOOL resdup;
     int usekeysize, algkeysize;
--- modules/ssl/ssl_engine_kernel.c.orig
+++ modules/ssl/ssl_engine_kernel.c
@@ -113,6 +113,108 @@ static int has_buffered_data(request_rec
     return result;
 }
 
+static int ap_array_same_str_set(apr_array_header_t *s1, apr_array_header_t *s2)
+{
+    int i;
+    const char *c;
+    
+    if (s1 == s2) {
+        return 1;
+    }
+    else if (!s1 || !s2 || (s1->nelts != s2->nelts)) {
+        return 0;
+    }
+    
+    for (i = 0; i < s1->nelts; i++) {
+        c = APR_ARRAY_IDX(s1, i, const char *);
+        if (!c || !ap_array_str_contains(s2, c)) {
+            return 0;
+        }
+    }
+    return 1;
+}
+
+static int ssl_pk_server_compatible(modssl_pk_server_t *pks1, 
+                                    modssl_pk_server_t *pks2) 
+{
+    if (!pks1 || !pks2) {
+        return 0;
+    }
+    /* both have the same certificates? */
+    if ((pks1->ca_name_path != pks2->ca_name_path)
+        && (!pks1->ca_name_path || !pks2->ca_name_path 
+            || strcmp(pks1->ca_name_path, pks2->ca_name_path))) {
+        return 0;
+    }
+    if ((pks1->ca_name_file != pks2->ca_name_file)
+        && (!pks1->ca_name_file || !pks2->ca_name_file 
+            || strcmp(pks1->ca_name_file, pks2->ca_name_file))) {
+        return 0;
+    }
+    if (!ap_array_same_str_set(pks1->cert_files, pks2->cert_files)
+        || !ap_array_same_str_set(pks1->key_files, pks2->key_files)) {
+        return 0;
+    }
+    return 1;
+}
+
+static int ssl_auth_compatible(modssl_auth_ctx_t *a1, 
+                               modssl_auth_ctx_t *a2) 
+{
+    if (!a1 || !a2) {
+        return 0;
+    }
+    /* both have the same verification */
+    if ((a1->verify_depth != a2->verify_depth)
+        || (a1->verify_mode != a2->verify_mode)) {
+        return 0;
+    }
+    /* both have the same ca path/file */
+    if ((a1->ca_cert_path != a2->ca_cert_path)
+        && (!a1->ca_cert_path || !a2->ca_cert_path 
+            || strcmp(a1->ca_cert_path, a2->ca_cert_path))) {
+        return 0;
+    }
+    if ((a1->ca_cert_file != a2->ca_cert_file)
+        && (!a1->ca_cert_file || !a2->ca_cert_file 
+            || strcmp(a1->ca_cert_file, a2->ca_cert_file))) {
+        return 0;
+    }
+    /* both have the same ca cipher suite string */
+    if ((a1->cipher_suite != a2->cipher_suite)
+        && (!a1->cipher_suite || !a2->cipher_suite 
+            || strcmp(a1->cipher_suite, a2->cipher_suite))) {
+        return 0;
+    }
+    return 1;
+}
+
+static int ssl_ctx_compatible(modssl_ctx_t *ctx1, 
+                              modssl_ctx_t *ctx2) 
+{
+    if (!ctx1 || !ctx2 
+        || (ctx1->protocol != ctx2->protocol)
+        || !ssl_auth_compatible(&ctx1->auth, &ctx2->auth)
+        || !ssl_pk_server_compatible(ctx1->pks, ctx2->pks)) {
+        return 0;
+    }
+    return 1;
+}
+
+static int ssl_server_compatible(server_rec *s1, server_rec *s2)
+{
+    SSLSrvConfigRec *sc1 = s1? mySrvConfig(s1) : NULL;
+    SSLSrvConfigRec *sc2 = s2? mySrvConfig(s2) : NULL;
+
+    /* both use the same TLS protocol? */
+    if (!sc1 || !sc2 
+        || !ssl_ctx_compatible(sc1->server, sc2->server)) {
+        return 0;
+    }
+    
+    return 1;
+}
+
 /*
  *  Post Read Request Handler
  */
@@ -137,7 +239,13 @@ int ssl_hook_ReadReq(request_rec *r)
         }
     }
 
+    /* If we are on a slave connection, we do not expect to have an SSLConnRec,
+     * but our master connection might. */
     sslconn = myConnConfig(r->connection);
+    if (!(sslconn && sslconn->ssl) && r->connection->master) {
+        sslconn = myConnConfig(r->connection->master);
+    }
+    
     if (!sslconn) {
         return DECLINED;
     }
@@ -195,15 +303,16 @@ int ssl_hook_ReadReq(request_rec *r)
                             " provided in HTTP request", servername);
                 return HTTP_BAD_REQUEST;
             }
-            if (r->server != handshakeserver) {
+            if (r->server != handshakeserver 
+                && !ssl_server_compatible(sslconn->server, r->server)) {
                 /* 
-                 * We are really not in Kansas anymore...
                  * The request does not select the virtual host that was
-                 * selected by the SNI.
+                 * selected by the SNI and its SSL parameters are different
                  */
+                
                 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server, APLOGNO(02032)
                              "Hostname %s provided via SNI and hostname %s provided"
-                             " via HTTP select a different server",
+                             " via HTTP have no compatible SSL setup",
                              servername, r->hostname);
                 return HTTP_MISDIRECTED_REQUEST;
             }
@@ -302,6 +411,7 @@ int ssl_hook_Access(request_rec *r)
     SSLConnRec *sslconn         = myConnConfig(r->connection);
     SSL *ssl                    = sslconn ? sslconn->ssl : NULL;
     server_rec *handshakeserver = sslconn ? sslconn->server : NULL;
+    SSLSrvConfigRec *hssc       = handshakeserver? mySrvConfig(handshakeserver) : NULL;
     SSL_CTX *ctx = NULL;
     apr_array_header_t *requires;
     ssl_require_t *ssl_requires;
@@ -313,8 +423,19 @@ int ssl_hook_Access(request_rec *r)
     X509_STORE_CTX cert_store_ctx;
     STACK_OF(SSL_CIPHER) *cipher_list_old = NULL, *cipher_list = NULL;
     const SSL_CIPHER *cipher = NULL;
-    int depth, verify_old, verify, n;
+    int depth, verify_old, verify, n, is_slave = 0;
+    const char *ncipher_suite;
 
+    /* On a slave connection, we do not expect to have an SSLConnRec, but
+     * our master connection might have one. */
+    if (!(sslconn && ssl) && r->connection->master) {
+        sslconn         = myConnConfig(r->connection->master);
+        ssl             = sslconn ? sslconn->ssl : NULL;
+        handshakeserver = sslconn ? sslconn->server : NULL;
+        hssc            = handshakeserver? mySrvConfig(handshakeserver) : NULL;
+        is_slave        = 1;
+    }
+    
     if (ssl) {
         /*
          * We should have handshaken here (on handshakeserver),
@@ -333,7 +454,7 @@ int ssl_hook_Access(request_rec *r)
      * Support for SSLRequireSSL directive
      */
     if (dc->bSSLRequired && !ssl) {
-        if (sc->enabled == SSL_ENABLED_OPTIONAL) {
+        if ((sc->enabled == SSL_ENABLED_OPTIONAL) && !is_slave) {
             /* This vhost was configured for optional SSL, just tell the
              * client that we need to upgrade.
              */
@@ -416,8 +537,13 @@ int ssl_hook_Access(request_rec *r)
      *   new cipher suite. This approach is fine because the user explicitly
      *   has to enable this via ``SSLOptions +OptRenegotiate''. So we do no
      *   implicit optimizations.
-     */
-    if (dc->szCipherSuite || (r->server != handshakeserver)) {
+     */     
+    ncipher_suite = (dc->szCipherSuite? 
+                     dc->szCipherSuite : (r->server != handshakeserver)?
+                     sc->server->auth.cipher_suite : NULL);
+    
+    if (ncipher_suite && (!sslconn->cipher_suite 
+                          || strcmp(ncipher_suite, sslconn->cipher_suite))) {
         /* remember old state */
 
         if (dc->nOptions & SSL_OPT_OPTRENEGOTIATE) {
@@ -432,10 +558,18 @@ int ssl_hook_Access(request_rec *r)
         }
 
         /* configure new state */
-        if ((dc->szCipherSuite || sc->server->auth.cipher_suite) &&
-            !SSL_set_cipher_list(ssl, dc->szCipherSuite ?
-                                      dc->szCipherSuite :
-                                      sc->server->auth.cipher_suite)) {
+        if (is_slave) {
+            /* TODO: this categorically fails changed cipher suite settings
+             * on slave connections. We could do better by
+             * - create a new SSL* from our SSL_CTX and set cipher suite there,
+             *   and retrieve ciphers, free afterwards
+             * Modifying the SSL on a slave connection is no good.
+             */
+            apr_table_setn(r->notes, "ssl-renegotiate-forbidden", "cipher-suite");
+            return HTTP_FORBIDDEN;
+        }
+
+        if (!SSL_set_cipher_list(ssl, ncipher_suite)) {
             ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(02253)
                           "Unable to reconfigure (per-directory) "
                           "permitted SSL ciphers");
@@ -502,6 +636,15 @@ int ssl_hook_Access(request_rec *r)
         }
 
         if (renegotiate) {
+            if (is_slave) {
+                /* The request causes renegotiation on a slave connection.
+                 * This is not allowed since we might have concurrent requests
+                 * on this connection.
+                 */
+                apr_table_setn(r->notes, "ssl-renegotiate-forbidden", "cipher-suite");
+                return HTTP_FORBIDDEN;
+            }
+            
 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
             if (sc->cipher_server_pref == TRUE) {
                 SSL_set_options(ssl, SSL_OP_CIPHER_SERVER_PREFERENCE);
@@ -554,6 +697,7 @@ int ssl_hook_Access(request_rec *r)
      */
     if ((dc->nVerifyClient != SSL_CVERIFY_UNSET) ||
         (sc->server->auth.verify_mode != SSL_CVERIFY_UNSET)) {
+
         /* remember old state */
         verify_old = SSL_get_verify_mode(ssl);
         /* configure new state */
@@ -572,6 +716,9 @@ int ssl_hook_Access(request_rec *r)
             verify |= SSL_VERIFY_PEER;
         }
 
+        /* TODO: this seems premature since we do not know if there
+         *       are any changes required.
+         */
         SSL_set_verify(ssl, verify, ssl_callback_SSLVerify);
         SSL_set_verify_result(ssl, X509_V_OK);
 
@@ -587,6 +734,14 @@ int ssl_hook_Access(request_rec *r)
                   (verify     & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
             {
                 renegotiate = TRUE;
+                if (is_slave) {
+                    /* The request causes renegotiation on a slave connection.
+                     * This is not allowed since we might have concurrent requests
+                     * on this connection.
+                     */
+                    apr_table_setn(r->notes, "ssl-renegotiate-forbidden", "verify-client");
+                    return HTTP_FORBIDDEN;
+                }
                 /* optimization */
 
                 if ((dc->nOptions & SSL_OPT_OPTRENEGOTIATE) &&
@@ -907,6 +1062,10 @@ int ssl_hook_Access(request_rec *r)
                 return HTTP_FORBIDDEN;
             }
         }
+        /* remember any new cipher suite used in renegotiation */
+        if (ncipher_suite) {
+            sslconn->cipher_suite = ncipher_suite;
+        }
     }
 
     /* If we're trying to have the user name set from a client
@@ -1170,6 +1329,10 @@ int ssl_hook_Fixup(request_rec *r)
         apr_table_mergen(r->headers_out, "Connection", "upgrade");
     }
 
+    if (!(sslconn && sslconn->ssl) && r->connection->master) {
+        sslconn = myConnConfig(r->connection->master);
+    }
+
     /*
      * Check to see if SSL is on
      */
@@ -1192,8 +1355,8 @@ int ssl_hook_Fixup(request_rec *r)
 
     /* standard SSL environment variables */
     if (dc->nOptions & SSL_OPT_STDENVVARS) {
-        modssl_var_extract_dns(env, sslconn->ssl, r->pool);
-        modssl_var_extract_san_entries(env, sslconn->ssl, r->pool);
+        modssl_var_extract_dns(env, ssl, r->pool);
+        modssl_var_extract_san_entries(env, ssl, r->pool);
 
         for (i = 0; ssl_hook_Fixup_vars[i]; i++) {
             var = (char *)ssl_hook_Fixup_vars[i];
@@ -2037,7 +2200,8 @@ static int ssl_find_vhost(void *serverna
          * retrieval
          */
         sslcon->server = s;
-
+        sslcon->cipher_suite = sc->server->auth.cipher_suite;
+        
         /*
          * There is one special filter callback, which is set
          * very early depending on the base_server's log level.
@@ -2194,14 +2358,30 @@ int ssl_callback_alpn_select(SSL *ssl,
     init_vhost(c, ssl);
     
     proposed = ap_select_protocol(c, NULL, sslconn->server, client_protos);
-    *out = (const unsigned char *)(proposed? proposed : ap_get_protocol(c));
-    len = strlen((const char*)*out);
+    if (!proposed) {
+        proposed = ap_get_protocol(c);
+    }
+    
+    len = strlen(proposed);
     if (len > 255) {
         ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02840)
                       "ALPN negotiated protocol name too long");
         return SSL_TLSEXT_ERR_ALERT_FATAL;
     }
+    *out = (const unsigned char *)proposed;
     *outlen = (unsigned char)len;
+        
+    if (strcmp(proposed, ap_get_protocol(c))) {
+        apr_status_t status;
+        
+        status = ap_switch_protocol(c, NULL, sslconn->server, proposed);
+        if (status != APR_SUCCESS) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, status, c,
+                          APLOGNO(02908) "protocol switch to '%s' failed",
+                          proposed);
+            return SSL_TLSEXT_ERR_ALERT_FATAL;
+        }
+    }
 
     return SSL_TLSEXT_ERR_OK;
 }

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File 2.4.17-protocols.patch of Package apache2 (Revision 98aa7366c00dabca7f9a3ed12fa6beca)

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