Support for certificate status TLS extension.

26 files changed, 885 insertions, 56 deletions

diff --git a/CHANGES b/CHANGES
index dddc1eab43..73cf7b354a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,13 @@
 
  Changes between 0.9.8f and 0.9.9  [xx XXX xxxx]
 
+  *) Implement certificate status request TLS extension defined in RFC3546.
+     A client can set the appropriate parameters and receive the encoded
+     OCSP response via a callback. A server can query the supplied parameters
+     and set the encoded OCSP response in the callback. Add simplified examples
+     to s_client and s_server.
+     [Steve Henson]
+
   *) Implement Opaque PRF Input TLS extension as specified in
      draft-rescorla-tls-opaque-prf-input-00.txt.  Since this is not an
      official specification yet and no extension type assignment by
diff --git a/apps/apps.h b/apps/apps.h
index c7e490a271..4b1127f5e7 100644
--- a/apps/apps.h
+++ b/apps/apps.h
@@ -122,6 +122,9 @@
 #ifndef OPENSSL_NO_ENGINE
 #include <openssl/engine.h>
 #endif
+#ifndef OPENSSL_NO_OCSP
+#include <openssl/ocsp.h>
+#endif
 #include <openssl/ossl_typ.h>
 
 int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn);
@@ -247,6 +250,12 @@ X509_STORE *setup_verify(BIO *bp, char *CAfile, char *CApath);
 ENGINE *setup_engine(BIO *err, const char *engine, int debug);
 #endif
 
+#ifndef OPENSSL_NO_OCSP
+OCSP_RESPONSE *process_responder(BIO *err, OCSP_REQUEST *req,
+			char *host, char *path, char *port, int use_ssl,
+			int req_timeout);
+#endif
+
 int load_config(BIO *err, CONF *cnf);
 char *make_config_name(void);
 
diff --git a/apps/ocsp.c b/apps/ocsp.c
index 219dc2f359..df0339b743 100644
--- a/apps/ocsp.c
+++ b/apps/ocsp.c
@@ -120,7 +120,6 @@ int MAIN(int argc, char **argv)
 	long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
 	char *CAfile = NULL, *CApath = NULL;
 	X509_STORE *store = NULL;
-	SSL_CTX *ctx = NULL;
 	STACK_OF(X509) *sign_other = NULL, *verify_other = NULL, *rother = NULL;
 	char *sign_certfile = NULL, *verify_certfile = NULL, *rcertfile = NULL;
 	unsigned long sign_flags = 0, verify_flags = 0, rflags = 0;
@@ -723,48 +722,14 @@ int MAIN(int argc, char **argv)
 	else if (host)
 		{
 #ifndef OPENSSL_NO_SOCK
-		cbio = BIO_new_connect(host);
+		resp = process_responder(bio_err, req, host, path,
+						port, use_ssl, req_timeout);
+		if (!resp)
+			goto end;
 #else
 		BIO_printf(bio_err, "Error creating connect BIO - sockets not supported.\n");
 		goto end;
 #endif
-		if (!cbio)
-			{
-			BIO_printf(bio_err, "Error creating connect BIO\n");
-			goto end;
-			}
-		if (port) BIO_set_conn_port(cbio, port);
-		if (use_ssl == 1)
-			{
-			BIO *sbio;
-#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
-			ctx = SSL_CTX_new(SSLv23_client_method());
-#elif !defined(OPENSSL_NO_SSL3)
-			ctx = SSL_CTX_new(SSLv3_client_method());
-#elif !defined(OPENSSL_NO_SSL2)
-			ctx = SSL_CTX_new(SSLv2_client_method());
-#else
-			BIO_printf(bio_err, "SSL is disabled\n");
-			goto end;
-#endif
-			if (ctx == NULL)
-				{
-				BIO_printf(bio_err, "Error creating SSL context.\n");
-				goto end;
-				}
-			SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
-			sbio = BIO_new_ssl(ctx, 1);
-			cbio = BIO_push(sbio, cbio);
-			}
-
-		resp = query_responder(bio_err, cbio, path, req, req_timeout);
-		BIO_free_all(cbio);
-		cbio = NULL;
-		if (!resp)
-			{
-			BIO_printf(bio_err, "Error querying OCSP responsder\n");
-			goto end;
-			}
 		}
 	else if (respin)
 		{
@@ -913,7 +878,6 @@ end:
 		OPENSSL_free(host);
 		OPENSSL_free(port);
 		OPENSSL_free(path);
-		SSL_CTX_free(ctx);
 		}
 
 	OPENSSL_EXIT(ret);
@@ -1334,4 +1298,51 @@ static OCSP_RESPONSE *query_responder(BIO *err, BIO *cbio, char *path,
 	return rsp;
 	}
 
+OCSP_RESPONSE *process_responder(BIO *err, OCSP_REQUEST *req,
+			char *host, char *path, char *port, int use_ssl,
+			int req_timeout)
+	{
+	BIO *cbio = NULL;
+	SSL_CTX *ctx = NULL;
+	OCSP_RESPONSE *resp = NULL;
+	cbio = BIO_new_connect(host);
+	if (!cbio)
+		{
+		BIO_printf(err, "Error creating connect BIO\n");
+		goto end;
+		}
+	if (port) BIO_set_conn_port(cbio, port);
+	if (use_ssl == 1)
+		{
+		BIO *sbio;
+#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
+		ctx = SSL_CTX_new(SSLv23_client_method());
+#elif !defined(OPENSSL_NO_SSL3)
+		ctx = SSL_CTX_new(SSLv3_client_method());
+#elif !defined(OPENSSL_NO_SSL2)
+		ctx = SSL_CTX_new(SSLv2_client_method());
+#else
+		BIO_printf(err, "SSL is disabled\n");
+			goto end;
+#endif
+		if (ctx == NULL)
+			{
+			BIO_printf(err, "Error creating SSL context.\n");
+			goto end;
+			}
+		SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
+		sbio = BIO_new_ssl(ctx, 1);
+		cbio = BIO_push(sbio, cbio);
+		}
+	resp = query_responder(err, cbio, path, req, req_timeout);
+	if (!resp)
+		BIO_printf(bio_err, "Error querying OCSP responsder\n");
+	end:
+	if (ctx)
+		SSL_CTX_free(ctx);
+	if (cbio)
+		BIO_free_all(cbio);
+	return resp;
+	}
+
 #endif
diff --git a/apps/s_client.c b/apps/s_client.c
index 3474e6c6a7..3ccaca3330 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -161,6 +161,7 @@ typedef unsigned int u_int;
 #include <openssl/err.h>
 #include <openssl/pem.h>
 #include <openssl/rand.h>
+#include <openssl/ocsp.h>
 #include "s_apps.h"
 #include "timeouts.h"
 
@@ -196,12 +197,14 @@ static int c_Pause=0;
 static int c_debug=0;
 #ifndef OPENSSL_NO_TLSEXT
 static int c_tlsextdebug=0;
+static int c_status_req=0;
 #endif
 static int c_msg=0;
 static int c_showcerts=0;
 
 static void sc_usage(void);
 static void print_stuff(BIO *berr,SSL *con,int full);
+static int ocsp_resp_cb(SSL *s, void *arg);
 static BIO *bio_c_out=NULL;
 static int c_quiet=0;
 static int c_ign_eof=0;
@@ -329,6 +332,7 @@ static void sc_usage(void)
 #ifndef OPENSSL_NO_TLSEXT
 	BIO_printf(bio_err," -servername host  - Set TLS extension servername in ClientHello\n");
 	BIO_printf(bio_err," -tlsextdebug      - hex dump of all TLS extensions received\n");
+	BIO_printf(bio_err," -status           - request certificate status from server\n");
 	BIO_printf(bio_err," -no_ticket        - disable use of RFC4507bis session tickets\n");
 #endif
 	}
@@ -528,6 +532,8 @@ int MAIN(int argc, char **argv)
 #ifndef OPENSSL_NO_TLSEXT
 		else if	(strcmp(*argv,"-tlsextdebug") == 0)
 			c_tlsextdebug=1;
+		else if	(strcmp(*argv,"-status") == 0)
+			c_status_req=1;
 #endif
 #ifdef WATT32
 		else if (strcmp(*argv,"-wdebug") == 0)
@@ -954,6 +960,23 @@ re_start:
 		SSL_set_tlsext_debug_callback(con, tlsext_cb);
 		SSL_set_tlsext_debug_arg(con, bio_c_out);
 		}
+	if (c_status_req)
+		{
+		SSL_set_tlsext_status_type(con, TLSEXT_STATUSTYPE_ocsp);
+		SSL_CTX_set_tlsext_status_cb(ctx, ocsp_resp_cb);
+		SSL_CTX_set_tlsext_status_arg(ctx, bio_c_out);
+#if 0
+{
+STACK_OF(OCSP_RESPID) *ids = sk_OCSP_RESPID_new_null();
+OCSP_RESPID *id = OCSP_RESPID_new();
+id->value.byKey = ASN1_OCTET_STRING_new();
+id->type = V_OCSP_RESPID_KEY;
+ASN1_STRING_set(id->value.byKey, "Hello World", -1);
+sk_OCSP_RESPID_push(ids, id);
+SSL_set_tlsext_status_ids(con, ids);
+}
+#endif
+		}
 #endif
 
 	SSL_set_bio(con,sbio,sbio);
@@ -1592,3 +1615,28 @@ static void print_stuff(BIO *bio, SSL *s, int full)
 	(void)BIO_flush(bio);
 	}
 
+static int ocsp_resp_cb(SSL *s, void *arg)
+	{
+	const unsigned char *p;
+	int len;
+	OCSP_RESPONSE *rsp;
+	len = SSL_get_tlsext_status_ocsp_resp(s, &p);
+	BIO_puts(arg, "OCSP response: ");
+	if (!p)
+		{
+		BIO_puts(arg, "no response sent\n");
+		return 1;
+		}
+	rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
+	if (!rsp)
+		{
+		BIO_puts(arg, "response parse error\n");
+		BIO_dump_indent(arg, (char *)p, len, 4);
+		return 0;
+		}
+	BIO_puts(arg, "\n======================================\n");
+	OCSP_RESPONSE_print(arg, rsp, 0);
+	BIO_puts(arg, "======================================\n");
+	OCSP_RESPONSE_free(rsp);
+	return 1;
+	}
diff --git a/apps/s_server.c b/apps/s_server.c
index 3b99a620da..b3ec6091bc 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -179,6 +179,7 @@ typedef unsigned int u_int;
 #include <openssl/x509.h>
 #include <openssl/ssl.h>
 #include <openssl/rand.h>
+#include <openssl/ocsp.h>
 #ifndef OPENSSL_NO_DH
 #include <openssl/dh.h>
 #endif
@@ -283,6 +284,8 @@ static BIO *bio_s_out=NULL;
 static int s_debug=0;
 #ifndef OPENSSL_NO_TLSEXT
 static int s_tlsextdebug=0;
+static int s_tlsextstatus=0;
+static int cert_status_cb(SSL *s, void *arg);
 #endif
 static int s_msg=0;
 static int s_quiet=0;
@@ -664,6 +667,152 @@ static int MS_CALLBACK ssl_servername_cb(SSL *s, int *ad, void *arg)
 		}
 	return SSL_TLSEXT_ERR_OK;
 }
+
+/* Structure passed to cert status callback */
+
+typedef struct tlsextstatusctx_st {
+   /* Default responder to use */
+   char *host, *path, *port;
+   int use_ssl;
+   int timeout;
+   BIO *err;
+   int verbose;
+} tlsextstatusctx;
+
+static tlsextstatusctx tlscstatp = {NULL, NULL, NULL, 0, -1, NULL, 0};
+
+/* Certificate Status callback. This is called when a client includes a
+ * certificate status request extension.
+ *
+ * This is a simplified version. It examines certificates each time and
+ * makes one OCSP responder query for each request.
+ *
+ * A full version would store details such as the OCSP certificate IDs and
+ * minimise the number of OCSP responses by caching them until they were
+ * considered "expired".
+ */
+
+static int cert_status_cb(SSL *s, void *arg)
+	{
+	tlsextstatusctx *srctx = arg;
+	BIO *err = srctx->err;
+	char *host, *port, *path;
+	int use_ssl;
+	unsigned char *rspder = NULL;
+	int rspderlen;
+	STACK *aia = NULL;
+	X509 *x = NULL;
+	X509_STORE_CTX inctx;
+	X509_OBJECT obj;
+	OCSP_REQUEST *req = NULL;
+	OCSP_RESPONSE *resp = NULL;
+	OCSP_CERTID *id = NULL;
+	STACK_OF(X509_EXTENSION) *exts;
+	int ret = SSL_TLSEXT_ERR_NOACK;
+	int i;
+#if 0
+STACK_OF(OCSP_RESPID) *ids;
+SSL_get_tlsext_status_ids(s, &ids);
+BIO_printf(err, "cert_status: received %d ids\n", sk_OCSP_RESPID_num(ids));
+#endif
+	if (srctx->verbose)
+		BIO_puts(err, "cert_status: callback called\n");
+	/* Build up OCSP query from server certificate */
+	x = SSL_get_certificate(s);
+	aia = X509_get1_ocsp(x);
+	if (aia)
+		{
+		if (!OCSP_parse_url(sk_value(aia, 0),
+			&host, &port, &path, &use_ssl))
+			{
+			BIO_puts(err, "cert_status: can't parse AIA URL\n");
+			goto err;
+			}
+		if (srctx->verbose)
+			BIO_printf(err, "cert_status: AIA URL: %s\n",
+					sk_value(aia, 0));
+		}
+	else
+		{
+		if (!srctx->host)
+			{
+			BIO_puts(srctx->err, "cert_status: no AIA and no default responder URL\n");
+			goto done;
+			}
+		host = srctx->host;
+		path = srctx->path;
+		port = srctx->port;
+		use_ssl = srctx->use_ssl;
+		}
+		
+	if (!X509_STORE_CTX_init(&inctx,
+				SSL_CTX_get_cert_store(SSL_get_SSL_CTX(s)),
+				NULL, NULL))
+		goto err;
+	if (X509_STORE_get_by_subject(&inctx,X509_LU_X509,
+				X509_get_issuer_name(x),&obj) <= 0)
+		{
+		BIO_puts(err, "cert_status: Can't retrieve issuer certificate.\n");
+		X509_STORE_CTX_cleanup(&inctx);
+		goto done;
+		}
+	req = OCSP_REQUEST_new();
+	if (!req)
+		goto err;
+	id = OCSP_cert_to_id(NULL, x, obj.data.x509);
+	X509_free(obj.data.x509);
+	X509_STORE_CTX_cleanup(&inctx);
+	if (!id)
+		goto err;
+	if (!OCSP_request_add0_id(req, id))
+		goto err;
+	id = NULL;
+	/* Add any extensions to the request */
+	SSL_get_tlsext_status_exts(s, &exts);
+	for (i = 0; i < sk_X509_EXTENSION_num(exts); i++)
+		{
+		X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
+		if (!OCSP_REQUEST_add_ext(req, ext, -1))
+			goto err;
+		}
+	resp = process_responder(err, req, host, path, port, use_ssl,
+					srctx->timeout);
+	if (!resp)
+		{
+		BIO_puts(err, "cert_status: error querying responder\n");
+		goto done;
+		}
+	rspderlen = i2d_OCSP_RESPONSE(resp, &rspder);
+	if (rspderlen <= 0)
+		goto err;
+	SSL_set_tlsext_status_ocsp_resp(s, rspder, rspderlen);
+	if (srctx->verbose)
+		{
+		BIO_puts(err, "cert_status: ocsp response sent:\n");
+		OCSP_RESPONSE_print(err, resp, 2);
+		}
+	ret = SSL_TLSEXT_ERR_OK;
+	done:
+	if (ret != SSL_TLSEXT_ERR_OK)
+		ERR_print_errors(err);
+	if (aia)
+		{
+		OPENSSL_free(host);
+		OPENSSL_free(path);
+		OPENSSL_free(port);
+		X509_email_free(aia);
+		}
+	if (id)
+		OCSP_CERTID_free(id);
+	if (req)
+		OCSP_REQUEST_free(req);
+	if (resp)
+		OCSP_RESPONSE_free(resp);
+	return ret;
+	err:
+	ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+	goto done;
+	}
 #endif
 
 int MAIN(int, char **);
@@ -877,6 +1026,33 @@ int MAIN(int argc, char *argv[])
 #ifndef OPENSSL_NO_TLSEXT
 		else if	(strcmp(*argv,"-tlsextdebug") == 0)
 			s_tlsextdebug=1;
+		else if	(strcmp(*argv,"-status") == 0)
+			s_tlsextstatus=1;
+		else if	(strcmp(*argv,"-status_verbose") == 0)
+			{
+			s_tlsextstatus=1;
+			tlscstatp.verbose = 1;
+			}
+		else if (!strcmp(*argv, "-status_timeout"))
+			{
+			s_tlsextstatus=1;
+                        if (--argc < 1) goto bad;
+			tlscstatp.timeout = atoi(*(++argv));
+			}
+		else if (!strcmp(*argv, "-status_url"))
+			{
+			s_tlsextstatus=1;
+                        if (--argc < 1) goto bad;
+			if (!OCSP_parse_url(*(++argv),
+					&tlscstatp.host,
+					&tlscstatp.port,
+					&tlscstatp.path,
+					&tlscstatp.use_ssl))
+				{
+				BIO_printf(bio_err, "Error parsing URL\n");
+				goto bad;
+				}
+			}
 #endif
 		else if	(strcmp(*argv,"-msg") == 0)
 			{ s_msg=1; }
@@ -1560,6 +1736,12 @@ static int sv_body(char *hostname, int s, unsigned char *context)
 		SSL_set_tlsext_debug_callback(con, tlsext_cb);
 		SSL_set_tlsext_debug_arg(con, bio_s_out);
 		}
+	if (s_tlsextstatus);
+		{
+		SSL_CTX_set_tlsext_status_cb(ctx, cert_status_cb);
+		tlscstatp.err = bio_err;
+		SSL_CTX_set_tlsext_status_arg(ctx, &tlscstatp);
+		}
 #endif
 #ifndef OPENSSL_NO_KRB5
 		if ((con->kssl_ctx = kssl_ctx_new()) != NULL)
diff --git a/apps/x509.c b/apps/x509.c
index dfe41a6f1f..1fa93aaeba 100644
--- a/apps/x509.c
+++ b/apps/x509.c
@@ -114,6 +114,7 @@ static const char *x509_usage[]={
 " -alias          - output certificate alias\n",
 " -noout          - no certificate output\n",
 " -ocspid         - print OCSP hash values for the subject name and public key\n",
+" -ocspurl        - print OCSP Responder URL(s)\n",
 " -trustout       - output a \"trusted\" certificate\n",
 " -clrtrust       - clear all trusted purposes\n",
 " -clrreject      - clear all rejected purposes\n",
@@ -179,6 +180,7 @@ int MAIN(int argc, char **argv)
 	int next_serial=0;
 	int subject_hash=0,issuer_hash=0,ocspid=0;
 	int noout=0,sign_flag=0,CA_flag=0,CA_createserial=0,email=0;
+	int ocsp_uri=0;
 	int trustout=0,clrtrust=0,clrreject=0,aliasout=0,clrext=0;
 	int C=0;
 	int x509req=0,days=DEF_DAYS,modulus=0,pubkey=0;
@@ -378,6 +380,8 @@ int MAIN(int argc, char **argv)
 			C= ++num;
 		else if (strcmp(*argv,"-email") == 0)
 			email= ++num;
+		else if (strcmp(*argv,"-ocsp_uri") == 0)
+			ocsp_uri= ++num;
 		else if (strcmp(*argv,"-serial") == 0)
 			serial= ++num;
 		else if (strcmp(*argv,"-next_serial") == 0)
@@ -731,11 +735,14 @@ bad:
 				ASN1_INTEGER_free(ser);
 				BIO_puts(out, "\n");
 				}
-			else if (email == i) 
+			else if ((email == i) || (ocsp_uri == i))
 				{
 				int j;
 				STACK *emlst;
-				emlst = X509_get1_email(x);
+				if (email == i)
+					emlst = X509_get1_email(x);
+				else
+					emlst = X509_get1_ocsp(x);
 				for (j = 0; j < sk_num(emlst); j++)
 					BIO_printf(STDout, "%s\n", sk_value(emlst, j));
 				X509_email_free(emlst);
diff --git a/crypto/asn1/x_exten.c b/crypto/asn1/x_exten.c
index 702421b6c8..1732e66712 100644
--- a/crypto/asn1/x_exten.c
+++ b/crypto/asn1/x_exten.c
@@ -67,5 +67,10 @@ ASN1_SEQUENCE(X509_EXTENSION) = {
 	ASN1_SIMPLE(X509_EXTENSION, value, ASN1_OCTET_STRING)
 } ASN1_SEQUENCE_END(X509_EXTENSION)
 
+ASN1_ITEM_TEMPLATE(X509_EXTENSIONS) = 
+	ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Extension, X509_EXTENSION)
+ASN1_ITEM_TEMPLATE_END(X509_EXTENSIONS)
+
 IMPLEMENT_ASN1_FUNCTIONS(X509_EXTENSION)
+IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(X509_EXTENSIONS, X509_EXTENSIONS, X509_EXTENSIONS)
 IMPLEMENT_ASN1_DUP_FUNCTION(X509_EXTENSION)
diff --git a/crypto/ocsp/ocsp.h b/crypto/ocsp/ocsp.h
index 34bb62c277..bbfc5055df 100644
--- a/crypto/ocsp/ocsp.h
+++ b/crypto/ocsp/ocsp.h
@@ -187,11 +187,11 @@ typedef struct ocsp_resp_bytes_st
  *      responseStatus         OCSPResponseStatus,
  *      responseBytes          [0] EXPLICIT ResponseBytes OPTIONAL }
  */
-typedef struct ocsp_response_st
+struct ocsp_response_st
 	{
 	ASN1_ENUMERATED *responseStatus;
 	OCSP_RESPBYTES  *responseBytes;
-	} OCSP_RESPONSE;
+	};
 
 /*   ResponderID ::= CHOICE {
  *      byName   [1] Name,
@@ -199,14 +199,18 @@ typedef struct ocsp_response_st
  */
 #define V_OCSP_RESPID_NAME 0
 #define V_OCSP_RESPID_KEY  1
-typedef struct ocsp_responder_id_st
+struct ocsp_responder_id_st
 	{
 	int type;
 	union   {
 		X509_NAME* byName;
         	ASN1_OCTET_STRING *byKey;
 		} value;
-	} OCSP_RESPID;
+	};
+
+DECLARE_STACK_OF(OCSP_RESPID)
+DECLARE_ASN1_FUNCTIONS(OCSP_RESPID)
+
 /*   KeyHash ::= OCTET STRING --SHA-1 hash of responder's public key
  *                            --(excluding the tag and length fields)
  */
diff --git a/crypto/ossl_typ.h b/crypto/ossl_typ.h
index b132405098..2a66d484b9 100644
--- a/crypto/ossl_typ.h
+++ b/crypto/ossl_typ.h
@@ -188,5 +188,7 @@ typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d
 					int idx, long argl, void *argp);
 
 typedef struct ocsp_req_ctx_st OCSP_REQ_CTX;
+typedef struct ocsp_response_st OCSP_RESPONSE;
+typedef struct ocsp_responder_id_st OCSP_RESPID;
 
 #endif /* def HEADER_OPENSSL_TYPES_H */
diff --git a/crypto/stack/safestack.h b/crypto/stack/safestack.h
index 250929bf7d..f80353598f 100644
--- a/crypto/stack/safestack.h
+++ b/crypto/stack/safestack.h
@@ -1074,6 +1074,28 @@ STACK_OF(type) \
 #define sk_OCSP_ONEREQ_sort(st) SKM_sk_sort(OCSP_ONEREQ, (st))
 #define sk_OCSP_ONEREQ_is_sorted(st) SKM_sk_is_sorted(OCSP_ONEREQ, (st))
 
+#define sk_OCSP_RESPID_new(st) SKM_sk_new(OCSP_RESPID, (st))
+#define sk_OCSP_RESPID_new_null() SKM_sk_new_null(OCSP_RESPID)
+#define sk_OCSP_RESPID_free(st) SKM_sk_free(OCSP_RESPID, (st))
+#define sk_OCSP_RESPID_num(st) SKM_sk_num(OCSP_RESPID, (st))
+#define sk_OCSP_RESPID_value(st, i) SKM_sk_value(OCSP_RESPID, (st), (i))
+#define sk_OCSP_RESPID_set(st, i, val) SKM_sk_set(OCSP_RESPID, (st), (i), (val))
+#define sk_OCSP_RESPID_zero(st) SKM_sk_zero(OCSP_RESPID, (st))
+#define sk_OCSP_RESPID_push(st, val) SKM_sk_push(OCSP_RESPID, (st), (val))
+#define sk_OCSP_RESPID_unshift(st, val) SKM_sk_unshift(OCSP_RESPID, (st), (val))
+#define sk_OCSP_RESPID_find(st, val) SKM_sk_find(OCSP_RESPID, (st), (val))
+#define sk_OCSP_RESPID_find_ex(st, val) SKM_sk_find_ex(OCSP_RESPID, (st), (val))
+#define sk_OCSP_RESPID_delete(st, i) SKM_sk_delete(OCSP_RESPID, (st), (i))
+#define sk_OCSP_RESPID_delete_ptr(st, ptr) SKM_sk_delete_ptr(OCSP_RESPID, (st), (ptr))
+#define sk_OCSP_RESPID_insert(st, val, i) SKM_sk_insert(OCSP_RESPID, (st), (val), (i))
+#define sk_OCSP_RESPID_set_cmp_func(st, cmp) SKM_sk_set_cmp_func(OCSP_RESPID, (st), (cmp))
+#define sk_OCSP_RESPID_dup(st) SKM_sk_dup(OCSP_RESPID, st)
+#define sk_OCSP_RESPID_pop_free(st, free_func) SKM_sk_pop_free(OCSP_RESPID, (st), (free_func))
+#define sk_OCSP_RESPID_shift(st) SKM_sk_shift(OCSP_RESPID, (st))
+#define sk_OCSP_RESPID_pop(st) SKM_sk_pop(OCSP_RESPID, (st))
+#define sk_OCSP_RESPID_sort(st) SKM_sk_sort(OCSP_RESPID, (st))
+#define sk_OCSP_RESPID_is_sorted(st) SKM_sk_is_sorted(OCSP_RESPID, (st))
+
 #define sk_OCSP_SINGLERESP_new(st) SKM_sk_new(OCSP_SINGLERESP, (st))
 #define sk_OCSP_SINGLERESP_new_null() SKM_sk_new_null(OCSP_SINGLERESP)
 #define sk_OCSP_SINGLERESP_free(st) SKM_sk_free(OCSP_SINGLERESP, (st))
diff --git a/crypto/x509/x509.h b/crypto/x509/x509.h
index 914fb04b1d..4f40712448 100644
--- a/crypto/x509/x509.h
+++ b/crypto/x509/x509.h
@@ -205,6 +205,8 @@ typedef struct X509_extension_st
 	ASN1_OCTET_STRING *value;
 	} X509_EXTENSION;
 
+typedef STACK_OF(X509_EXTENSION) X509_EXTENSIONS;
+
 DECLARE_STACK_OF(X509_EXTENSION)
 DECLARE_ASN1_SET_OF(X509_EXTENSION)
 
@@ -801,6 +803,7 @@ DECLARE_ASN1_FUNCTIONS(X509_ATTRIBUTE)
 X509_ATTRIBUTE *X509_ATTRIBUTE_create(int nid, int atrtype, void *value);
 
 DECLARE_ASN1_FUNCTIONS(X509_EXTENSION)
+DECLARE_ASN1_ENCODE_FUNCTIONS(X509_EXTENSIONS, X509_EXTENSIONS, X509_EXTENSIONS)
 
 DECLARE_ASN1_FUNCTIONS(X509_NAME_ENTRY)
 
diff --git a/crypto/x509/x509_req.c b/crypto/x509/x509_req.c
index a2d78a8a12..48183dc00c 100644
--- a/crypto/x509/x509_req.c
+++ b/crypto/x509/x509_req.c
@@ -67,10 +67,6 @@
 #include <openssl/buffer.h>
 #include <openssl/pem.h>
 
-ASN1_ITEM_TEMPLATE(X509_EXTENSIONS) = 
-	ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Extension, X509_EXTENSION)
-ASN1_ITEM_TEMPLATE_END(X509_EXTENSIONS)
-
 X509_REQ *X509_to_X509_REQ(X509 *x, EVP_PKEY *pkey, const EVP_MD *md)
 	{
 	X509_REQ *ret;
diff --git a/crypto/x509v3/v3_utl.c b/crypto/x509v3/v3_utl.c
index f1b5c94c2a..6aa54aedfa 100644
--- a/crypto/x509v3/v3_utl.c
+++ b/crypto/x509v3/v3_utl.c
@@ -473,6 +473,30 @@ STACK *X509_get1_email(X509 *x)
 	return ret;
 }
 
+STACK *X509_get1_ocsp(X509 *x)
+{
+	AUTHORITY_INFO_ACCESS *info;
+	STACK *ret = NULL;
+	int i;
+	info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
+	if (!info)
+		return NULL;
+	for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++)
+		{
+		ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
+		if (OBJ_obj2nid(ad->method) == NID_ad_OCSP)
+			{
+			if (ad->location->type == GEN_URI)
+				{
+				if (!append_ia5(&ret, ad->location->d.uniformResourceIdentifier))
+					break;
+				}
+			}
+		}
+	AUTHORITY_INFO_ACCESS_free(info);
+	return ret;
+}
+
 STACK *X509_REQ_get1_email(X509_REQ *x)
 {
 	GENERAL_NAMES *gens;
diff --git a/crypto/x509v3/x509v3.h b/crypto/x509v3/x509v3.h
index cbadc4c185..be0c97a404 100644
--- a/crypto/x509v3/x509v3.h
+++ b/crypto/x509v3/x509v3.h
@@ -649,6 +649,7 @@ int X509_PURPOSE_get_id(X509_PURPOSE *);
 STACK *X509_get1_email(X509 *x);
 STACK *X509_REQ_get1_email(X509_REQ *x);
 void X509_email_free(STACK *sk);
+STACK *X509_get1_ocsp(X509 *x);
 
 ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc);
 ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc);
diff --git a/ssl/s23_clnt.c b/ssl/s23_clnt.c
index c500a932a7..78c39d9af5 100644
--- a/ssl/s23_clnt.c
+++ b/ssl/s23_clnt.c
@@ -283,6 +283,8 @@ static int ssl23_client_hello(SSL *s)
 
 		if (s->tlsext_hostname != NULL)
 			ssl2_compat = 0;
+		if (s->tlsext_status_type != -1)
+			ssl2_compat = 0;
 		
 #ifdef TLSEXT_TYPE_opaque_prf_input
 		if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c
index f8f43eb938..b7d8d4213b 100644
--- a/ssl/s3_clnt.c
+++ b/ssl/s3_clnt.c
@@ -307,10 +307,23 @@ int ssl3_connect(SSL *s)
 				{
 				ret=ssl3_get_server_certificate(s);
 				if (ret <= 0) goto end;
+#ifndef OPENSSL_NO_TLSEXT
+				if (s->tlsext_status_expected)
+					s->state=SSL3_ST_CR_CERT_STATUS_A;
+				else
+					s->state=SSL3_ST_CR_KEY_EXCH_A;
+				}
+			else
+				{
+				skip = 1;
+				s->state=SSL3_ST_CR_KEY_EXCH_A;
 				}
+#else
 			else
 				skip=1;
+
 			s->state=SSL3_ST_CR_KEY_EXCH_A;
+#endif
 			s->init_num=0;
 			break;
 
@@ -473,6 +486,14 @@ int ssl3_connect(SSL *s)
 			s->state=SSL3_ST_CR_FINISHED_A;
 			s->init_num=0;
 		break;
+
+		case SSL3_ST_CR_CERT_STATUS_A:
+		case SSL3_ST_CR_CERT_STATUS_B:
+			ret=ssl3_get_cert_status(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CR_KEY_EXCH_A;
+			s->init_num=0;
+		break;
 #endif
 
 		case SSL3_ST_CR_FINISHED_A:
@@ -1795,6 +1816,75 @@ f_err:
 err:
 	return(-1);
 	}
+
+int ssl3_get_cert_status(SSL *s)
+	{
+	int ok, al;
+	unsigned long resplen;
+	long n;
+	const unsigned char *p;
+
+	n=s->method->ssl_get_message(s,
+		SSL3_ST_CR_CERT_STATUS_A,
+		SSL3_ST_CR_CERT_STATUS_B,
+		SSL3_MT_CERTIFICATE_STATUS,
+		16384,
+		&ok);
+
+	if (!ok) return((int)n);
+	if (n < 4)
+		{
+		/* need at least status type + length */
+		al = SSL_AD_DECODE_ERROR;
+		SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
+		goto f_err;
+		}
+	p = (unsigned char *)s->init_msg;
+	if (*p++ != TLSEXT_STATUSTYPE_ocsp)
+		{
+		al = SSL_AD_DECODE_ERROR;
+		SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
+		goto f_err;
+		}
+	n2l3(p, resplen);
+	if (resplen + 4 != n)
+		{
+		al = SSL_AD_DECODE_ERROR;
+		SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
+		goto f_err;
+		}
+	if (s->tlsext_ocsp_resp)
+		OPENSSL_free(s->tlsext_ocsp_resp);
+	s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
+	if (!s->tlsext_ocsp_resp)
+		{
+		al = SSL_AD_INTERNAL_ERROR;
+		SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
+		goto f_err;
+		}
+	s->tlsext_ocsp_resplen = resplen;
+	if (s->ctx->tlsext_status_cb)
+		{
+		int ret;
+		ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+		if (ret == 0)
+			{
+			al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
+			SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
+			goto f_err;
+			}
+		if (ret < 0)
+			{
+			al = SSL_AD_INTERNAL_ERROR;
+			SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
+			goto f_err;
+			}
+		}
+	return 1;
+f_err:
+	ssl3_send_alert(s,SSL3_AL_FATAL,al);
+	return(-1);
+	}
 #endif
 
 int ssl3_get_server_done(SSL *s)
diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
index 548eeef6f3..9910a132e8 100644
--- a/ssl/s3_lib.c
+++ b/ssl/s3_lib.c
@@ -2383,6 +2383,43 @@ long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg)
 		break;
 #endif
 
+	case SSL_CTRL_SET_TLSEXT_STATUS_REQ_TYPE:
+		s->tlsext_status_type=larg;
+		ret = 1;
+		break;
+
+	case SSL_CTRL_GET_TLSEXT_STATUS_REQ_EXTS:
+		*(STACK_OF(X509_EXTENSION) **)parg = s->tlsext_ocsp_exts;
+		ret = 1;
+		break;
+
+	case SSL_CTRL_SET_TLSEXT_STATUS_REQ_EXTS:
+		s->tlsext_ocsp_exts = parg;
+		ret = 1;
+		break;
+
+	case SSL_CTRL_GET_TLSEXT_STATUS_REQ_IDS:
+		*(STACK_OF(OCSP_RESPID) **)parg = s->tlsext_ocsp_ids;
+		ret = 1;
+		break;
+
+	case SSL_CTRL_SET_TLSEXT_STATUS_REQ_IDS:
+		s->tlsext_ocsp_ids = parg;
+		ret = 1;
+		break;
+
+	case SSL_CTRL_GET_TLSEXT_STATUS_REQ_OCSP_RESP:
+		*(unsigned char **)parg = s->tlsext_ocsp_resp;
+		return s->tlsext_ocsp_resplen;
+		
+	case SSL_CTRL_SET_TLSEXT_STATUS_REQ_OCSP_RESP:
+		if (s->tlsext_ocsp_resp)
+			OPENSSL_free(s->tlsext_ocsp_resp);
+		s->tlsext_ocsp_resp = parg;
+		s->tlsext_ocsp_resplen = larg;
+		ret = 1;
+		break;
+
 #endif /* !OPENSSL_NO_TLSEXT */
 	default:
 		break;
@@ -2610,6 +2647,11 @@ long ssl3_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
 		return 1;
 #endif
 
+	case SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB_ARG:
+		ctx->tlsext_status_arg=parg;
+		return 1;
+		break;
+
 #endif /* !OPENSSL_NO_TLSEXT */
 
 	/* A Thawte special :-) */
@@ -2668,6 +2710,10 @@ long ssl3_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void))
 		break;
 #endif
 
+	case SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB:
+		ctx->tlsext_status_cb=(int (*)(SSL *,void *))fp;
+		break;
+
 #endif
 	default:
 		return(0);
diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index 697ab725bd..cc01cb109f 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -332,10 +332,23 @@ int ssl3_accept(SSL *s)
 				{
 				ret=ssl3_send_server_certificate(s);
 				if (ret <= 0) goto end;
+#ifndef OPENSSL_NO_TLSEXT
+				if (s->tlsext_status_expected)
+					s->state=SSL3_ST_SW_CERT_STATUS_A;
+				else
+					s->state=SSL3_ST_SW_KEY_EXCH_A;
 				}
 			else
+				{
+				skip = 1;
+				s->state=SSL3_ST_SW_KEY_EXCH_A;
+				}
+#else
+			else
 				skip=1;
+
 			s->state=SSL3_ST_SW_KEY_EXCH_A;
+#endif
 			s->init_num=0;
 			break;
 
@@ -551,6 +564,14 @@ int ssl3_accept(SSL *s)
 			s->init_num=0;
 			break;
 
+		case SSL3_ST_SW_CERT_STATUS_A:
+		case SSL3_ST_SW_CERT_STATUS_B:
+			ret=ssl3_send_cert_status(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_SW_KEY_EXCH_A;
+			s->init_num=0;
+			break;
+
 #endif
 
 		case SSL3_ST_SW_CHANGE_A:
@@ -2823,4 +2844,39 @@ int ssl3_send_newsession_ticket(SSL *s)
 	/* SSL3_ST_SW_SESSION_TICKET_B */
 	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 	}
+
+int ssl3_send_cert_status(SSL *s)
+	{
+	if (s->state == SSL3_ST_SW_CERT_STATUS_A)
+		{
+		unsigned char *p;
+		/* Grow buffer if need be: the length calculation is as
+ 		 * follows 1 (message type) + 3 (message length) +
+ 		 * 1 (ocsp response type) + 3 (ocsp response length)
+ 		 * + (ocsp response)
+ 		 */
+		if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
+			return -1;
+
+		p=(unsigned char *)s->init_buf->data;
+
+		/* do the header */
+		*(p++)=SSL3_MT_CERTIFICATE_STATUS;
+		/* message length */
+		l2n3(s->tlsext_ocsp_resplen + 4, p);
+		/* status type */
+		*(p++)= s->tlsext_status_type;
+		/* length of OCSP response */
+		l2n3(s->tlsext_ocsp_resplen, p);
+		/* actual response */
+		memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
+		/* number of bytes to write */
+		s->init_num = 8 + s->tlsext_ocsp_resplen;
+		s->state=SSL3_ST_SW_CERT_STATUS_B;
+		s->init_off = 0;
+		}
+
+	/* SSL3_ST_SW_CERT_STATUS_B */
+	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
+	}
 #endif
diff --git a/ssl/ssl.h b/ssl/ssl.h
index ec42280a9c..32f572ce46 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -800,6 +800,11 @@ struct ssl_ctx_st
 	unsigned char tlsext_tick_hmac_key[16];
 	unsigned char tlsext_tick_aes_key[16];
 
+	/* certificate status request info */
+	/* Callback for status request */
+	int (*tlsext_status_cb)(SSL *ssl, void *arg);
+	void *tlsext_status_arg;
+
 	/* draft-rescorla-tls-opaque-prf-input-00.txt information */
 	int (*tlsext_opaque_prf_input_callback)(SSL *, void *peerinput, size_t len, void *arg);
 	void *tlsext_opaque_prf_input_callback_arg;
@@ -1083,6 +1088,18 @@ struct ssl_st
 	                          1 : prepare 2, allow last ack just after in server callback.
 	                          2 : don't call servername callback, no ack in server hello
 	                       */
+	/* certificate status request info */
+	/* Status type or -1 if no status type */
+	int tlsext_status_type;
+	/* Expect OCSP CertificateStatus message */
+	int tlsext_status_expected;
+	/* OCSP status request only */
+	STACK_OF(OCSP_RESPID) *tlsext_ocsp_ids;
+	X509_EXTENSIONS *tlsext_ocsp_exts;
+	/* OCSP response received or to be sent */
+	unsigned char *tlsext_ocsp_resp;
+	int tlsext_ocsp_resplen;
+
 	/* RFC4507 session ticket expected to be received or sent */
 	int tlsext_ticket_expected;
 #ifndef OPENSSL_NO_EC
@@ -1317,6 +1334,15 @@ DECLARE_PEM_rw(SSL_SESSION, SSL_SESSION)
 #define SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT	60
 #define SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT_CB	61
 #define SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT_CB_ARG 62
+#define SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB	63
+#define SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB_ARG	64
+#define SSL_CTRL_SET_TLSEXT_STATUS_REQ_TYPE	65
+#define SSL_CTRL_GET_TLSEXT_STATUS_REQ_EXTS	66
+#define SSL_CTRL_SET_TLSEXT_STATUS_REQ_EXTS	67
+#define SSL_CTRL_GET_TLSEXT_STATUS_REQ_IDS	68
+#define SSL_CTRL_SET_TLSEXT_STATUS_REQ_IDS	69
+#define SSL_CTRL_GET_TLSEXT_STATUS_REQ_OCSP_RESP	70
+#define SSL_CTRL_SET_TLSEXT_STATUS_REQ_OCSP_RESP	71
 #endif
 
 #define SSL_session_reused(ssl) \
@@ -1766,6 +1792,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_F_SSL3_ENC					 134
 #define SSL_F_SSL3_GENERATE_KEY_BLOCK			 238
 #define SSL_F_SSL3_GET_CERTIFICATE_REQUEST		 135
+#define SSL_F_SSL3_GET_CERT_STATUS			 288
 #define SSL_F_SSL3_GET_CERT_VERIFY			 136
 #define SSL_F_SSL3_GET_CLIENT_CERTIFICATE		 137
 #define SSL_F_SSL3_GET_CLIENT_HELLO			 138
@@ -1964,6 +1991,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_R_INVALID_CHALLENGE_LENGTH			 158
 #define SSL_R_INVALID_COMMAND				 280
 #define SSL_R_INVALID_PURPOSE				 278
+#define SSL_R_INVALID_STATUS_RESPONSE			 328
 #define SSL_R_INVALID_TICKET_KEYS_LENGTH		 325
 #define SSL_R_INVALID_TRUST				 279
 #define SSL_R_KEY_ARG_TOO_LONG				 284
@@ -2132,6 +2160,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_R_UNSUPPORTED_ELLIPTIC_CURVE		 315
 #define SSL_R_UNSUPPORTED_PROTOCOL			 258
 #define SSL_R_UNSUPPORTED_SSL_VERSION			 259
+#define SSL_R_UNSUPPORTED_STATUS_TYPE			 329
 #define SSL_R_WRITE_BIO_NOT_SET				 260
 #define SSL_R_WRONG_CIPHER_RETURNED			 261
 #define SSL_R_WRONG_MESSAGE_TYPE			 262
diff --git a/ssl/ssl3.h b/ssl/ssl3.h
index e04226f46f..646a8e6cce 100644
--- a/ssl/ssl3.h
+++ b/ssl/ssl3.h
@@ -545,6 +545,8 @@ typedef struct ssl3_state_st
 #define SSL3_ST_CR_FINISHED_B		(0x1D1|SSL_ST_CONNECT)
 #define SSL3_ST_CR_SESSION_TICKET_A	(0x1E0|SSL_ST_CONNECT)
 #define SSL3_ST_CR_SESSION_TICKET_B	(0x1E1|SSL_ST_CONNECT)
+#define SSL3_ST_CR_CERT_STATUS_A	(0x1F0|SSL_ST_CONNECT)
+#define SSL3_ST_CR_CERT_STATUS_B	(0x1F1|SSL_ST_CONNECT)
 
 /* server */
 /* extra state */
@@ -588,6 +590,8 @@ typedef struct ssl3_state_st
 #define SSL3_ST_SW_FINISHED_B		(0x1E1|SSL_ST_ACCEPT)
 #define SSL3_ST_SW_SESSION_TICKET_A	(0x1F0|SSL_ST_ACCEPT)
 #define SSL3_ST_SW_SESSION_TICKET_B	(0x1F1|SSL_ST_ACCEPT)
+#define SSL3_ST_SW_CERT_STATUS_A	(0x200|SSL_ST_ACCEPT)
+#define SSL3_ST_SW_CERT_STATUS_B	(0x201|SSL_ST_ACCEPT)
 
 #define SSL3_MT_HELLO_REQUEST			0
 #define SSL3_MT_CLIENT_HELLO			1
@@ -600,6 +604,7 @@ typedef struct ssl3_state_st
 #define SSL3_MT_CERTIFICATE_VERIFY		15
 #define SSL3_MT_CLIENT_KEY_EXCHANGE		16
 #define SSL3_MT_FINISHED			20
+#define SSL3_MT_CERTIFICATE_STATUS		22
 #define DTLS1_MT_HELLO_VERIFY_REQUEST    3
 
 
diff --git a/ssl/ssl_err.c b/ssl/ssl_err.c
index 3121e0e70c..d9c0e35681 100644
--- a/ssl/ssl_err.c
+++ b/ssl/ssl_err.c
@@ -140,6 +140,7 @@ static ERR_STRING_DATA SSL_str_functs[]=
 {ERR_FUNC(SSL_F_SSL3_ENC),	"SSL3_ENC"},
 {ERR_FUNC(SSL_F_SSL3_GENERATE_KEY_BLOCK),	"SSL3_GENERATE_KEY_BLOCK"},
 {ERR_FUNC(SSL_F_SSL3_GET_CERTIFICATE_REQUEST),	"SSL3_GET_CERTIFICATE_REQUEST"},
+{ERR_FUNC(SSL_F_SSL3_GET_CERT_STATUS),	"SSL3_GET_CERT_STATUS"},
 {ERR_FUNC(SSL_F_SSL3_GET_CERT_VERIFY),	"SSL3_GET_CERT_VERIFY"},
 {ERR_FUNC(SSL_F_SSL3_GET_CLIENT_CERTIFICATE),	"SSL3_GET_CLIENT_CERTIFICATE"},
 {ERR_FUNC(SSL_F_SSL3_GET_CLIENT_HELLO),	"SSL3_GET_CLIENT_HELLO"},
@@ -341,6 +342,7 @@ static ERR_STRING_DATA SSL_str_reasons[]=
 {ERR_REASON(SSL_R_INVALID_CHALLENGE_LENGTH),"invalid challenge length"},
 {ERR_REASON(SSL_R_INVALID_COMMAND)       ,"invalid command"},
 {ERR_REASON(SSL_R_INVALID_PURPOSE)       ,"invalid purpose"},
+{ERR_REASON(SSL_R_INVALID_STATUS_RESPONSE),"invalid status response"},
 {ERR_REASON(SSL_R_INVALID_TICKET_KEYS_LENGTH),"invalid ticket keys length"},
 {ERR_REASON(SSL_R_INVALID_TRUST)         ,"invalid trust"},
 {ERR_REASON(SSL_R_KEY_ARG_TOO_LONG)      ,"key arg too long"},
@@ -509,6 +511,7 @@ static ERR_STRING_DATA SSL_str_reasons[]=
 {ERR_REASON(SSL_R_UNSUPPORTED_ELLIPTIC_CURVE),"unsupported elliptic curve"},
 {ERR_REASON(SSL_R_UNSUPPORTED_PROTOCOL)  ,"unsupported protocol"},
 {ERR_REASON(SSL_R_UNSUPPORTED_SSL_VERSION),"unsupported ssl version"},
+{ERR_REASON(SSL_R_UNSUPPORTED_STATUS_TYPE),"unsupported status type"},
 {ERR_REASON(SSL_R_WRITE_BIO_NOT_SET)     ,"write bio not set"},
 {ERR_REASON(SSL_R_WRONG_CIPHER_RETURNED) ,"wrong cipher returned"},
 {ERR_REASON(SSL_R_WRONG_MESSAGE_TYPE)    ,"wrong message type"},
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 00a93eeee9..c5d9f0e93e 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -152,6 +152,7 @@
 #include <openssl/lhash.h>
 #include <openssl/x509v3.h>
 #include <openssl/rand.h>
+#include <openssl/ocsp.h>
 #ifndef OPENSSL_NO_DH
 #include <openssl/dh.h>
 #endif
@@ -340,6 +341,12 @@ SSL *SSL_new(SSL_CTX *ctx)
 	s->tlsext_debug_cb = 0;
 	s->tlsext_debug_arg = NULL;
 	s->tlsext_ticket_expected = 0;
+	s->tlsext_status_type = -1;
+	s->tlsext_status_expected = 0;
+	s->tlsext_ocsp_ids = NULL;
+	s->tlsext_ocsp_exts = NULL;
+	s->tlsext_ocsp_resp = NULL;
+	s->tlsext_ocsp_resplen = -1;
 	CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
 	s->initial_ctx=ctx;
 #endif
@@ -543,6 +550,13 @@ void SSL_free(SSL *s)
 	if (s->tlsext_ellipticcurvelist) OPENSSL_free(s->tlsext_ellipticcurvelist);
 #endif /* OPENSSL_NO_EC */
 	if (s->tlsext_opaque_prf_input) OPENSSL_free(s->tlsext_opaque_prf_input);
+	if (s->tlsext_ocsp_exts)
+		sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
+						X509_EXTENSION_free);
+	if (s->tlsext_ocsp_ids)
+		sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
+	if (s->tlsext_ocsp_resp)
+		OPENSSL_free(s->tlsext_ocsp_resp);
 #endif
 
 	if (s->client_CA != NULL)
@@ -1556,6 +1570,9 @@ SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
 		|| (RAND_bytes(ret->tlsext_tick_aes_key, 16) <= 0))
 		ret->options |= SSL_OP_NO_TICKET;
 
+	ret->tlsext_status_cb = 0;
+	ret->tlsext_status_arg = NULL;
+
 #endif
 #ifndef OPENSSL_NO_PSK
 	ret->psk_identity_hint=NULL;
diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index 50a8acc015..cb93ff2188 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -829,6 +829,7 @@ int ssl3_put_cipher_by_char(const SSL_CIPHER *c,unsigned char *p);
 void ssl3_init_finished_mac(SSL *s);
 int ssl3_send_server_certificate(SSL *s);
 int ssl3_send_newsession_ticket(SSL *s);
+int ssl3_send_cert_status(SSL *s);
 int ssl3_get_finished(SSL *s,int state_a,int state_b);
 int ssl3_setup_key_block(SSL *s);
 int ssl3_send_change_cipher_spec(SSL *s,int state_a,int state_b);
@@ -921,6 +922,7 @@ int ssl3_client_hello(SSL *s);
 int ssl3_get_server_hello(SSL *s);
 int ssl3_get_certificate_request(SSL *s);
 int ssl3_get_new_session_ticket(SSL *s);
+int ssl3_get_cert_status(SSL *s);
 int ssl3_get_server_done(SSL *s);
 int ssl3_send_client_verify(SSL *s);
 int ssl3_send_client_certificate(SSL *s);
diff --git a/ssl/t1_enc.c b/ssl/t1_enc.c
index 3509f62b18..4aa7600fe7 100644
--- a/ssl/t1_enc.c
+++ b/ssl/t1_enc.c
@@ -899,7 +899,7 @@ int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 	{
 	unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 	const void *co = NULL, *so = NULL;
-	int col = 0, sol = NULL;
+	int col = 0, sol = 0;
 
 #ifdef KSSL_DEBUG
 	printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 1aaf8905c8..476e4240e5 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -113,6 +113,7 @@
 #include <openssl/objects.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
+#include <openssl/ocsp.h>
 #include "ssl_locl.h"
 
 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
@@ -387,6 +388,54 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned cha
 		}
 #endif
 
+	if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
+		{
+		int i;
+		long extlen, idlen, itmp;
+		OCSP_RESPID *id;
+
+		idlen = 0;
+		for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
+			{
+			id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
+			itmp = i2d_OCSP_RESPID(id, NULL);
+			if (itmp <= 0)
+				return NULL;
+			idlen += itmp + 2;
+			}
+
+		if (s->tlsext_ocsp_exts)
+			{
+			extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
+			if (extlen < 0)
+				return NULL;
+			}
+		else
+			extlen = 0;
+			
+		if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
+		s2n(TLSEXT_TYPE_status_request, ret);
+		if (extlen + idlen > 0xFFF0)
+			return NULL;
+		s2n(extlen + idlen + 5, ret);
+		*(ret++) = TLSEXT_STATUSTYPE_ocsp;
+		s2n(idlen, ret);
+		for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
+			{
+			/* save position of id len */
+			unsigned char *q = ret;
+			id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
+			/* skip over id len */
+			ret += 2;
+			itmp = i2d_OCSP_RESPID(id, &ret);
+			/* write id len */
+			s2n(itmp, q);
+			}
+		s2n(extlen, ret);
+		if (extlen > 0)
+			i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
+		}
+
 	if ((extdatalen = ret-p-2)== 0) 
 		return p;
 
@@ -432,7 +481,7 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned cha
 		}
 	/* Currently the server should not respond with a SupportedCurves extension */
 #endif /* OPENSSL_NO_EC */
-	
+
 	if (s->tlsext_ticket_expected
 		&& !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 
 		{ 
@@ -441,6 +490,13 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned cha
 		s2n(0,ret);
 		}
 
+	if (s->tlsext_status_expected)
+		{ 
+		if ((long)(limit - ret - 4) < 0) return NULL; 
+		s2n(TLSEXT_TYPE_status_request,ret);
+		s2n(0,ret);
+		}
+
 #ifdef TLSEXT_TYPE_opaque_prf_input
 	if (s->s3->server_opaque_prf_input != NULL)
 		{
@@ -473,6 +529,7 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 	unsigned short len;
 	unsigned char *data = *p;
 	s->servername_done = 0;
+	s->tlsext_status_type = -1;
 
 	if (data >= (d+n-2))
 		return 1;
@@ -675,6 +732,106 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 				}
 			}
 #endif
+		else if (type == TLSEXT_TYPE_status_request
+						&& s->ctx->tlsext_status_cb)
+			{
+		
+			if (size < 5) 
+				{
+				*al = SSL_AD_DECODE_ERROR;
+				return 0;
+				}
+
+			s->tlsext_status_type = *data++;
+			size--;
+			if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
+				{
+				const unsigned char *sdata;
+				int dsize;
+				/* Read in responder_id_list */
+				n2s(data,dsize);
+				size -= 2;
+				if (dsize > size  ) 
+					{
+					*al = SSL_AD_DECODE_ERROR;
+					return 0;
+					}
+				while (dsize > 0)
+					{
+					OCSP_RESPID *id;
+					int idsize;
+					if (dsize < 4)
+						{
+						*al = SSL_AD_DECODE_ERROR;
+						return 0;
+						}
+					n2s(data, idsize);
+					dsize -= 2 + idsize;
+					if (dsize < 0)
+						{
+						*al = SSL_AD_DECODE_ERROR;
+						return 0;
+						}
+					sdata = data;
+					data += idsize;
+					id = d2i_OCSP_RESPID(NULL,
+								&sdata, idsize);
+					if (!id)
+						{
+						*al = SSL_AD_DECODE_ERROR;
+						return 0;
+						}
+					if (data != sdata)
+						{
+						OCSP_RESPID_free(id);
+						*al = SSL_AD_DECODE_ERROR;
+						return 0;
+						}
+					if (!s->tlsext_ocsp_ids
+						&& !(s->tlsext_ocsp_ids =
+						sk_OCSP_RESPID_new_null()))
+						{
+						OCSP_RESPID_free(id);
+						*al = SSL_AD_INTERNAL_ERROR;
+						return 0;
+						}
+					if (!sk_OCSP_RESPID_push(
+							s->tlsext_ocsp_ids, id))
+						{
+						OCSP_RESPID_free(id);
+						*al = SSL_AD_INTERNAL_ERROR;
+						return 0;
+						}
+					}
+
+				/* Read in request_extensions */
+				n2s(data,dsize);
+				size -= 2;
+				if (dsize > size) 
+					{
+					*al = SSL_AD_DECODE_ERROR;
+					return 0;
+					}
+				sdata = data;
+				if (dsize > 0)
+					{
+					s->tlsext_ocsp_exts =
+						d2i_X509_EXTENSIONS(NULL,
+							&sdata, dsize);
+					if (!s->tlsext_ocsp_exts
+						|| (data + dsize != sdata))
+						{
+						*al = SSL_AD_DECODE_ERROR;
+						return 0;
+						}
+					}
+				}
+				/* We don't know what to do with any other type
+ 			 	* so ignore it.
+ 			 	*/
+				else
+					s->tlsext_status_type = -1;
+			}
 
 		/* session ticket processed earlier */
 		data+=size;
@@ -791,6 +948,19 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 				}
 			}
 #endif
+		else if (type == TLSEXT_TYPE_status_request)
+			{
+			/* MUST be empty and only sent if we've requested
+			 * a status request message.
+			 */ 
+			if ((s->tlsext_status_type == -1) || (size > 0))
+				{
+				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
+				return 0;
+				}
+			/* Set flag to expect CertificateStatus message */
+			s->tlsext_status_expected = 1;
+			}
 
 		data+=size;		
 		}
@@ -822,6 +992,35 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 			}
 		}
 
+	/* If we've requested certificate status and we wont get one
+ 	 * tell the callback
+ 	 */
+	if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
+			&& s->ctx->tlsext_status_cb)
+		{
+		int r;
+		/* Set resp to NULL, resplen to -1 so callback knows
+ 		 * there is no response.
+ 		 */
+		if (s->tlsext_ocsp_resp)
+			{
+			OPENSSL_free(s->tlsext_ocsp_resp);
+			s->tlsext_ocsp_resp = NULL;
+			}
+		s->tlsext_ocsp_resplen = -1;
+		r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+		if (r == 0)
+			{
+			*al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
+			return 0;
+			}
+		if (r < 0)
+			{
+			*al = SSL_AD_INTERNAL_ERROR;
+			return 0;
+			}
+		}
+
 	*p = data;
 	return 1;
 	}
@@ -966,6 +1165,36 @@ int ssl_check_clienthello_tlsext(SSL *s)
 	else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 		
 		ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 
+	/* If status request then ask callback what to do.
+ 	 * Note: this must be called after servername callbacks in case 
+ 	 * the certificate has changed.
+ 	 */
+	if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb)
+		{
+		int r;
+		r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+		switch (r)
+			{
+			/* We don't want to send a status request response */
+			case SSL_TLSEXT_ERR_NOACK:
+				s->tlsext_status_expected = 0;
+				break;
+			/* status request response should be sent */
+			case SSL_TLSEXT_ERR_OK:
+				if (s->tlsext_ocsp_resp)
+					s->tlsext_status_expected = 1;
+				else
+					s->tlsext_status_expected = 0;
+				break;
+			/* something bad happened */
+			case SSL_TLSEXT_ERR_ALERT_FATAL:
+				ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+				al = SSL_AD_INTERNAL_ERROR;
+				goto err;
+			}
+		}
+	else
+		s->tlsext_status_expected = 0;
 
 #ifdef TLSEXT_TYPE_opaque_prf_input
  	{
@@ -1022,8 +1251,8 @@ int ssl_check_clienthello_tlsext(SSL *s)
 			al = SSL_AD_HANDSHAKE_FAILURE;
 			}
 	}
-#endif
 
+#endif
  err:
 	switch (ret)
 		{
diff --git a/ssl/tls1.h b/ssl/tls1.h
index cac8d0ea22..d831eecd87 100644
--- a/ssl/tls1.h
+++ b/ssl/tls1.h
@@ -203,6 +203,8 @@ extern "C" {
 
 /* NameType value from RFC 3546 */
 #define TLSEXT_NAMETYPE_host_name 0
+/* status request value from RFC 3546 */
+#define TLSEXT_STATUSTYPE_ocsp 1
 
 /* ECPointFormat values from draft-ietf-tls-ecc-12 */
 #define TLSEXT_ECPOINTFORMAT_first			0
@@ -227,12 +229,33 @@ SSL_callback_ctrl(ssl,SSL_CTRL_SET_TLSEXT_DEBUG_CB,(void (*)(void))cb)
 #define SSL_set_tlsext_debug_arg(ssl, arg) \
 SSL_ctrl(ssl,SSL_CTRL_SET_TLSEXT_DEBUG_ARG,0, (void *)arg)
 
+#define SSL_set_tlsext_status_type(ssl, type) \
+SSL_ctrl(ssl,SSL_CTRL_SET_TLSEXT_STATUS_REQ_TYPE,type, NULL)
+
+#define SSL_get_tlsext_status_exts(ssl, arg) \
+SSL_ctrl(ssl,SSL_CTRL_GET_TLSEXT_STATUS_REQ_EXTS,0, (void *)arg)
+
+#define SSL_set_tlsext_status_exts(ssl, arg) \
+SSL_ctrl(ssl,SSL_CTRL_SET_TLSEXT_STATUS_REQ_EXTS,0, (void *)arg)
+
+#define SSL_get_tlsext_status_ids(ssl, arg) \
+SSL_ctrl(ssl,SSL_CTRL_GET_TLSEXT_STATUS_REQ_IDS,0, (void *)arg)
+
+#define SSL_set_tlsext_status_ids(ssl, arg) \
+SSL_ctrl(ssl,SSL_CTRL_SET_TLSEXT_STATUS_REQ_IDS,0, (void *)arg)
+
+#define SSL_get_tlsext_status_ocsp_resp(ssl, arg) \
+SSL_ctrl(ssl,SSL_CTRL_GET_TLSEXT_STATUS_REQ_OCSP_RESP,0, (void *)arg)
+
+#define SSL_set_tlsext_status_ocsp_resp(ssl, arg, arglen) \
+SSL_ctrl(ssl,SSL_CTRL_SET_TLSEXT_STATUS_REQ_OCSP_RESP,arglen, (void *)arg)
+
 #define SSL_CTX_set_tlsext_servername_callback(ctx, cb) \
 SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TLSEXT_SERVERNAME_CB,(void (*)(void))cb)
 
-#define SSL_TLSEXT_ERR_OK 0    
-#define SSL_TLSEXT_ERR_ALERT_WARNING 1  
-#define SSL_TLSEXT_ERR_ALERT_FATAL 2 
+#define SSL_TLSEXT_ERR_OK 0
+#define SSL_TLSEXT_ERR_ALERT_WARNING 1
+#define SSL_TLSEXT_ERR_ALERT_FATAL 2
 #define SSL_TLSEXT_ERR_NOACK 3
 
 #define SSL_CTX_set_tlsext_servername_arg(ctx, arg) \
@@ -243,6 +266,12 @@ SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG,0, (void *)arg)
 #define SSL_CTX_set_tlsext_ticket_keys(ctx, keys, keylen) \
 	SSL_CTX_ctrl((ctx),SSL_CTRL_SET_TLXEXT_TICKET_KEYS,(keylen),(keys))
 
+#define SSL_CTX_set_tlsext_status_cb(ssl, cb) \
+SSL_CTX_callback_ctrl(ssl,SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB,(void (*)(void))cb)
+
+#define SSL_CTX_set_tlsext_status_arg(ssl, arg) \
+SSL_CTX_ctrl(ssl,SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB_ARG,0, (void *)arg)
+
 #define SSL_set_tlsext_opaque_prf_input(s, src, len) \
 SSL_ctrl(s,SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT, len, src)
 #define SSL_CTX_set_tlsext_opaque_prf_input_callback(ctx, cb) \