From: Graham Leggett <minfrin@apache.org>
Date: Mon, 1 Mar 2010 01:31:36 +0000 (+0000)
Subject: mod_ssl: Fix potential SSL I/O filter hang if a long list of
X-Git-Tag: 2.2.15~18
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=40b00fabe1597f21e591c9bb0567be743e080174;p=thirdparty%2Fapache%2Fhttpd.git

mod_ssl: Fix potential SSL I/O filter hang if a long list of
trusted CAs is configured for client cert auth.  PR 46952
+1: jorton, wrowe [from review of svn patch], minfrin


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@917343 13f79535-47bb-0310-9956-ffa450edef68
---

diff --git a/CHANGES b/CHANGES
index 6ffa7215d69..dd12f1afa4d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -42,6 +42,9 @@ Changes with Apache 2.2.15
      allows insecure renegotiation with clients which do not yet
      support the secure renegotiation protocol.  [Joe Orton]
 
+  *) mod_ssl: Fix a potential I/O hang if a long list of trusted CAs
+     is configured for client cert auth. PR 46952.  [Joe Orton]
+
   *) core: Fix potential memory leaks by making sure to not destroy
      bucket brigades that have been created by earlier filters.
      [Stefan Fritsch]
diff --git a/STATUS b/STATUS
index 2500926a488..fe90d21ac6a 100644
--- a/STATUS
+++ b/STATUS
@@ -99,14 +99,6 @@ RELEASE SHOWSTOPPERS:
 PATCHES ACCEPTED TO BACKPORT FROM TRUNK:
   [ start all new proposals below, under PATCHES PROPOSED. ]
 
-  * mod_ssl: Fix potential SSL I/O filter hang if a long list of
-    trusted CAs is configured for client cert auth.  PR 46952
-      Trunk version of patch:
-        http://svn.apache.org/viewcvs.cgi?rev=788715&view=rev
-      Backport version for 2.2.x of patch:
-        http://people.apache.org/~jorton/ms_flush.diff
-      +1: jorton, wrowe [from review of svn patch], minfrin
-
 
 PATCHES PROPOSED TO BACKPORT FROM TRUNK:
   [ New proposals should be added at the end of the list ]
diff --git a/modules/ssl/ssl_engine_io.c b/modules/ssl/ssl_engine_io.c
index 72536702269..2ddaa920811 100644
--- a/modules/ssl/ssl_engine_io.c
+++ b/modules/ssl/ssl_engine_io.c
@@ -465,7 +465,6 @@ static int bio_filter_in_read(BIO *bio, char *in, int inlen)
     apr_size_t inl = inlen;
     bio_filter_in_ctx_t *inctx = (bio_filter_in_ctx_t *)(bio->ptr);
     apr_read_type_e block = inctx->block;
-    SSLConnRec *sslconn = myConnConfig(inctx->f->c);
 
     inctx->rc = APR_SUCCESS;
 
@@ -473,23 +472,19 @@ static int bio_filter_in_read(BIO *bio, char *in, int inlen)
     if (!in)
         return 0;
 
-    /* Abort early if the client has initiated a renegotiation. */
-    if (inctx->filter_ctx->config->reneg_state == RENEG_ABORT) {
-        inctx->rc = APR_ECONNABORTED;
-        return -1;
-    }
-
-    /* XXX: flush here only required for SSLv2;
-     * OpenSSL calls BIO_flush() at the appropriate times for
-     * the other protocols.
+    /* In theory, OpenSSL should flush as necessary, but it is known
+     * not to do so correctly in some cases; see PR 46952.
+     *
+     * Historically, this flush call was performed only for an SSLv2
+     * connection or for a proxy connection.  Calling _out_flush
+     * should be very cheap in cases where it is unnecessary (and no
+     * output is buffered) so the performance impact of doing it
+     * unconditionally should be minimal.
      */
-    if ((SSL_version(inctx->ssl) == SSL2_VERSION) || sslconn->is_proxy) {
-        if (bio_filter_out_flush(inctx->bio_out) < 0) {
-            bio_filter_out_ctx_t *outctx =
-                   (bio_filter_out_ctx_t *)(inctx->bio_out->ptr);
-            inctx->rc = outctx->rc;
-            return -1;
-        }
+    if (bio_filter_out_flush(inctx->bio_out) < 0) {
+        bio_filter_out_ctx_t *outctx = inctx->bio_out->ptr;
+        inctx->rc = outctx->rc;
+        return -1;
     }
 
     BIO_clear_retry_flags(bio);