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mod_ssl: use SSL_OP_NO_RENEGOTIATION

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Resolves: RHEL-36720
This commit is contained in:
Joe Orton 2024-05-17 09:06:31 +01:00
parent 16e064a085
commit 0040a4da5a
2 changed files with 249 additions and 1 deletions
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244
httpd-2.4.59-pr426.patch Normal file
View File

@ -0,0 +1,244 @@
https://github.com/apache/httpd/pull/426.patch
Upstream-Status: in trunk, proposed for 2.4.60
--- httpd-2.4.59/modules/ssl/ssl_engine_init.c.mr426
+++ httpd-2.4.59/modules/ssl/ssl_engine_init.c
@@ -880,6 +880,13 @@
}
#endif
+#ifdef SSL_OP_NO_RENEGOTIATION
+ /* For server-side SSL_CTX, disable renegotiation by default.. */
+ if (!mctx->pkp) {
+ SSL_CTX_set_options(ctx, SSL_OP_NO_RENEGOTIATION);
+ }
+#endif
+
#ifdef SSL_OP_IGNORE_UNEXPECTED_EOF
/* For server-side SSL_CTX, enable ignoring unexpected EOF */
/* (OpenSSL 1.1.1 behavioural compatibility).. */
@@ -908,6 +915,14 @@
}
}
+#ifdef SSL_OP_NO_RENEGOTIATION
+/* OpenSSL-level renegotiation protection. */
+#define MODSSL_BLOCKS_RENEG (0)
+#else
+/* mod_ssl-level renegotiation protection. */
+#define MODSSL_BLOCKS_RENEG (1)
+#endif
+
static void ssl_init_ctx_callbacks(server_rec *s,
apr_pool_t *p,
apr_pool_t *ptemp,
@@ -921,7 +936,13 @@
SSL_CTX_set_tmp_dh_callback(ctx, ssl_callback_TmpDH);
#endif
- SSL_CTX_set_info_callback(ctx, ssl_callback_Info);
+ /* The info callback is used for debug-level tracing. For OpenSSL
+ * versions where SSL_OP_NO_RENEGOTIATION is not available, the
+ * callback is also used to prevent use of client-initiated
+ * renegotiation. Enable it in either case. */
+ if (APLOGdebug(s) || MODSSL_BLOCKS_RENEG) {
+ 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);
--- httpd-2.4.59/modules/ssl/ssl_engine_io.c.mr426
+++ httpd-2.4.59/modules/ssl/ssl_engine_io.c
@@ -208,11 +208,13 @@
BIO_clear_retry_flags(bio);
+#ifndef SSL_OP_NO_RENEGOTIATION
/* Abort early if the client has initiated a renegotiation. */
if (outctx->filter_ctx->config->reneg_state == RENEG_ABORT) {
outctx->rc = APR_ECONNABORTED;
return -1;
}
+#endif
ap_log_cerror(APLOG_MARK, APLOG_TRACE6, 0, outctx->c,
"bio_filter_out_write: %i bytes", inl);
@@ -473,11 +475,13 @@
BIO_clear_retry_flags(bio);
+#ifndef SSL_OP_NO_RENEGOTIATION
/* Abort early if the client has initiated a renegotiation. */
if (inctx->filter_ctx->config->reneg_state == RENEG_ABORT) {
inctx->rc = APR_ECONNABORTED;
return -1;
}
+#endif
if (!inctx->bb) {
inctx->rc = APR_EOF;
--- httpd-2.4.59/modules/ssl/ssl_engine_kernel.c.mr426
+++ httpd-2.4.59/modules/ssl/ssl_engine_kernel.c
@@ -992,7 +992,7 @@
/* Toggle the renegotiation state to allow the new
* handshake to proceed. */
- sslconn->reneg_state = RENEG_ALLOW;
+ modssl_set_reneg_state(sslconn, RENEG_ALLOW);
SSL_renegotiate(ssl);
SSL_do_handshake(ssl);
@@ -1019,7 +1019,7 @@
*/
SSL_peek(ssl, peekbuf, 0);
- sslconn->reneg_state = RENEG_REJECT;
+ modssl_set_reneg_state(sslconn, RENEG_REJECT);
if (!SSL_is_init_finished(ssl)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02261)
@@ -1078,7 +1078,7 @@
(sc->server->auth.verify_mode != SSL_CVERIFY_UNSET)) {
int vmode_inplace, vmode_needed;
int change_vmode = FALSE;
- int old_state, n, rc;
+ int n, rc;
vmode_inplace = SSL_get_verify_mode(ssl);
vmode_needed = SSL_VERIFY_NONE;
@@ -1180,8 +1180,6 @@
return HTTP_FORBIDDEN;
}
- old_state = sslconn->reneg_state;
- sslconn->reneg_state = RENEG_ALLOW;
modssl_set_app_data2(ssl, r);
SSL_do_handshake(ssl);
@@ -1191,7 +1189,6 @@
*/
SSL_peek(ssl, peekbuf, 0);
- sslconn->reneg_state = old_state;
modssl_set_app_data2(ssl, NULL);
/*
@@ -2263,8 +2260,8 @@
/*
* This callback function is executed while OpenSSL processes the SSL
* handshake and does SSL record layer stuff. It's used to trap
- * client-initiated renegotiations, and for dumping everything to the
- * log.
+ * client-initiated renegotiations (where SSL_OP_NO_RENEGOTIATION is
+ * not available), and for dumping everything to the log.
*/
void ssl_callback_Info(const SSL *ssl, int where, int rc)
{
@@ -2276,14 +2273,12 @@
return;
}
- /* With TLS 1.3 this callback may be called multiple times on the first
- * negotiation, so the below logic to detect renegotiations can't work.
- * Fortunately renegotiations are forbidden starting with TLS 1.3, and
- * this is enforced by OpenSSL so there's nothing to be done here.
- */
-#if SSL_HAVE_PROTOCOL_TLSV1_3
- if (SSL_version(ssl) < TLS1_3_VERSION)
-#endif
+#ifndef SSL_OP_NO_RENEGOTIATION
+ /* With OpenSSL < 1.1.1 (implying TLS v1.2 or earlier), this
+ * callback is used to block client-initiated renegotiation. With
+ * TLSv1.3 it is unnecessary since renegotiation is forbidden at
+ * protocol level. Otherwise (TLSv1.2 with OpenSSL >=1.1.1),
+ * SSL_OP_NO_RENEGOTIATION is used to block renegotiation. */
{
SSLConnRec *sslconn;
@@ -2308,6 +2303,7 @@
sslconn->reneg_state = RENEG_REJECT;
}
}
+#endif
s = mySrvFromConn(c);
if (s && APLOGdebug(s)) {
--- httpd-2.4.59/modules/ssl/ssl_private.h.mr426
+++ httpd-2.4.59/modules/ssl/ssl_private.h
@@ -558,6 +558,16 @@
apr_time_t source_mtime;
} ssl_asn1_t;
+typedef enum {
+ RENEG_INIT = 0, /* Before initial handshake */
+ RENEG_REJECT, /* After initial handshake; any client-initiated
+ * renegotiation should be rejected */
+ RENEG_ALLOW, /* A server-initiated renegotiation is taking
+ * place (as dictated by configuration) */
+ RENEG_ABORT /* Renegotiation initiated by client, abort the
+ * connection */
+} modssl_reneg_state;
+
/**
* Define the mod_ssl per-module configuration structure
* (i.e. the global configuration for each httpd process)
@@ -589,18 +599,13 @@
NON_SSL_SET_ERROR_MSG /* Need to set the error message */
} non_ssl_request;
- /* Track the handshake/renegotiation state for the connection so
- * that all client-initiated renegotiations can be rejected, as a
- * partial fix for CVE-2009-3555. */
- enum {
- RENEG_INIT = 0, /* Before initial handshake */
- RENEG_REJECT, /* After initial handshake; any client-initiated
- * renegotiation should be rejected */
- RENEG_ALLOW, /* A server-initiated renegotiation is taking
- * place (as dictated by configuration) */
- RENEG_ABORT /* Renegotiation initiated by client, abort the
- * connection */
- } reneg_state;
+#ifndef SSL_OP_NO_RENEGOTIATION
+ /* For OpenSSL < 1.1.1, track the handshake/renegotiation state
+ * for the connection to block client-initiated renegotiations.
+ * For OpenSSL >=1.1.1, the SSL_OP_NO_RENEGOTIATION flag is used in
+ * the SSL * options state with equivalent effect. */
+ modssl_reneg_state reneg_state;
+#endif
server_rec *server;
SSLDirConfigRec *dc;
@@ -1207,6 +1212,9 @@
* the configured ENGINE. */
int modssl_is_engine_id(const char *name);
+/* Set the renegotation state for connection. */
+void modssl_set_reneg_state(SSLConnRec *sslconn, modssl_reneg_state state);
+
#endif /* SSL_PRIVATE_H */
/** @} */
--- httpd-2.4.59/modules/ssl/ssl_util_ssl.c.mr426
+++ httpd-2.4.59/modules/ssl/ssl_util_ssl.c
@@ -612,3 +612,19 @@
}
return rv;
}
+
+void modssl_set_reneg_state(SSLConnRec *sslconn, modssl_reneg_state state)
+{
+#ifdef SSL_OP_NO_RENEGOTIATION
+ switch (state) {
+ case RENEG_ALLOW:
+ SSL_clear_options(sslconn->ssl, SSL_OP_NO_RENEGOTIATION);
+ break;
+ default:
+ SSL_set_options(sslconn->ssl, SSL_OP_NO_RENEGOTIATION);
+ break;
+ }
+#else
+ sslconn->reneg_state = state;
+#endif
+}

6
httpd.spec
View File

@ -25,7 +25,7 @@
Summary: Apache HTTP Server
Name: httpd
Version: 2.4.59
Release: 3.1%{?dist}
Release: 3.2%{?dist}
URL: https://httpd.apache.org/
Source0: https://www.apache.org/dist/httpd/httpd-%{version}.tar.bz2
Source1: https://www.apache.org/dist/httpd/httpd-%{version}.tar.bz2.asc
@ -104,6 +104,7 @@ Patch37: httpd-2.4.54-selinux.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=1397243
Patch60: httpd-2.4.43-enable-sslv3.patch
Patch61: httpd-2.4.59-r1916863.patch
Patch62: httpd-2.4.59-pr426.patch
# Security fixes
# Patch200: ...
@ -827,6 +828,9 @@ exit $rv
%{_rpmconfigdir}/macros.d/macros.httpd
%changelog
* Fri May 17 2024 Joe Orton <jorton@redhat.com> - 2.4.59-3.2
- mod_ssl: use SSL_OP_NO_RENEGOTIATION
* Fri May 3 2024 Joe Orton <jorton@redhat.com> - 2.4.59-3.1
- apachectl(8): use BUG_REPORT_URL from /etc/os-release
- apachectl(8): fix grammar (#2278748)