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-rw-r--r--modules/ssl/ssl_engine_init.c34
-rw-r--r--modules/ssl/ssl_engine_io.c4
-rw-r--r--modules/ssl/ssl_engine_kernel.c28
-rw-r--r--modules/ssl/ssl_private.h32
-rw-r--r--modules/ssl/ssl_util_ssl.c16
5 files changed, 80 insertions, 34 deletions
diff --git a/modules/ssl/ssl_engine_init.c b/modules/ssl/ssl_engine_init.c
index c2ec048..443eac4 100644
--- a/modules/ssl/ssl_engine_init.c
+++ b/modules/ssl/ssl_engine_init.c
@@ -844,6 +844,13 @@ static apr_status_t ssl_init_ctx_protocol(server_rec *s,
}
#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).. */
@@ -872,6 +879,14 @@ static void ssl_init_ctx_session_cache(server_rec *s,
}
}
+#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,
@@ -885,7 +900,13 @@ static void ssl_init_ctx_callbacks(server_rec *s,
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);
@@ -1346,6 +1367,7 @@ static apr_status_t ssl_init_server_certs(server_rec *s,
const char *vhost_id = mctx->sc->vhost_id, *key_id, *certfile, *keyfile;
int i;
EVP_PKEY *pkey;
+ int custom_dh_done = 0;
#ifdef HAVE_ECC
EC_GROUP *ecgroup = NULL;
int curve_nid = 0;
@@ -1518,14 +1540,14 @@ static apr_status_t ssl_init_server_certs(server_rec *s,
*/
certfile = APR_ARRAY_IDX(mctx->pks->cert_files, 0, const char *);
if (certfile && !modssl_is_engine_id(certfile)) {
- int done = 0, num_bits = 0;
+ int num_bits = 0;
#if OPENSSL_VERSION_NUMBER < 0x30000000L
DH *dh = modssl_dh_from_file(certfile);
if (dh) {
num_bits = DH_bits(dh);
SSL_CTX_set_tmp_dh(mctx->ssl_ctx, dh);
DH_free(dh);
- done = 1;
+ custom_dh_done = 1;
}
#else
pkey = modssl_dh_pkey_from_file(certfile);
@@ -1535,18 +1557,18 @@ static apr_status_t ssl_init_server_certs(server_rec *s,
EVP_PKEY_free(pkey);
}
else {
- done = 1;
+ custom_dh_done = 1;
}
}
#endif
- if (done) {
+ if (custom_dh_done) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02540)
"Custom DH parameters (%d bits) for %s loaded from %s",
num_bits, vhost_id, certfile);
}
}
#if !MODSSL_USE_OPENSSL_PRE_1_1_API
- else {
+ if (!custom_dh_done) {
/* If no parameter is manually configured, enable auto
* selection. */
SSL_CTX_set_dh_auto(mctx->ssl_ctx, 1);
diff --git a/modules/ssl/ssl_engine_io.c b/modules/ssl/ssl_engine_io.c
index b91f784..9c7d216 100644
--- a/modules/ssl/ssl_engine_io.c
+++ b/modules/ssl/ssl_engine_io.c
@@ -208,11 +208,13 @@ static int bio_filter_out_write(BIO *bio, const char *in, int inl)
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 @@ static int bio_filter_in_read(BIO *bio, char *in, int inlen)
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;
diff --git a/modules/ssl/ssl_engine_kernel.c b/modules/ssl/ssl_engine_kernel.c
index fe0496f..fa1b3a8 100644
--- a/modules/ssl/ssl_engine_kernel.c
+++ b/modules/ssl/ssl_engine_kernel.c
@@ -992,7 +992,7 @@ static int ssl_hook_Access_classic(request_rec *r, SSLSrvConfigRec *sc, SSLDirCo
/* 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 @@ static int ssl_hook_Access_classic(request_rec *r, SSLSrvConfigRec *sc, SSLDirCo
*/
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 @@ static int ssl_hook_Access_modern(request_rec *r, SSLSrvConfigRec *sc, SSLDirCon
(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 @@ static int ssl_hook_Access_modern(request_rec *r, SSLSrvConfigRec *sc, SSLDirCon
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 @@ static int ssl_hook_Access_modern(request_rec *r, SSLSrvConfigRec *sc, SSLDirCon
*/
SSL_peek(ssl, peekbuf, 0);
- sslconn->reneg_state = old_state;
modssl_set_app_data2(ssl, NULL);
/*
@@ -2263,8 +2260,8 @@ static void log_tracing_state(const SSL *ssl, conn_rec *c,
/*
* 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 @@ void ssl_callback_Info(const SSL *ssl, int where, int rc)
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 @@ void ssl_callback_Info(const SSL *ssl, int where, int rc)
sslconn->reneg_state = RENEG_REJECT;
}
}
+#endif
s = mySrvFromConn(c);
if (s && APLOGdebug(s)) {
diff --git a/modules/ssl/ssl_private.h b/modules/ssl/ssl_private.h
index 859e932..25d79ce 100644
--- a/modules/ssl/ssl_private.h
+++ b/modules/ssl/ssl_private.h
@@ -549,6 +549,16 @@ typedef struct {
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)
@@ -580,18 +590,13 @@ typedef struct {
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;
@@ -1198,6 +1203,9 @@ int ssl_is_challenge(conn_rec *c, const char *servername,
* 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 */
/** @} */
diff --git a/modules/ssl/ssl_util_ssl.c b/modules/ssl/ssl_util_ssl.c
index 44930b7..8bd9c8a 100644
--- a/modules/ssl/ssl_util_ssl.c
+++ b/modules/ssl/ssl_util_ssl.c
@@ -612,3 +612,19 @@ cleanup:
}
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
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-16 15:32:32 +0000