SSL export fixes (from Adam Langley) [original from 1.0.1]

ssl/s3_lib.c

@@ -2904,8 +2904,8 @@ SSL3_ENC_METHOD SSLv3_enc_data={
 	SSL3_MD_CLIENT_FINISHED_CONST,4,
 	SSL3_MD_SERVER_FINISHED_CONST,4,
 	ssl3_alert_code,
-	(int (*)(SSL *, unsigned char *, unsigned int, const char *,
-		 unsigned int, const unsigned char *, unsigned int,
+	(int (*)(SSL *, unsigned char *, size_t, const char *,
+		 size_t, const unsigned char *, size_t,
 		 int use_context))ssl_undefined_function,
 	};
 

ssl/ssl_lib.c

@@ -178,9 +178,9 @@ SSL3_ENC_METHOD ssl3_undef_enc_method={
 	NULL,	/* server_finished_label */
 	0,	/* server_finished_label_len */
 	(int (*)(int))ssl_undefined_function,
-	(int (*)(SSL *, unsigned char *, unsigned int, const char *,
-		 unsigned int, const unsigned char *, unsigned int,
-		 int use_context))ssl_undefined_function,
+	(int (*)(SSL *, unsigned char *, size_t, const char *,
+		 size_t, const unsigned char *, size_t,
+		 int use_context)) ssl_undefined_function,
 	};
 
 int SSL_clear(SSL *s)
@@ -1632,8 +1632,9 @@ void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx, int (*cb) (SSL *s, unsigned
 # endif
 #endif
 
-int SSL_export_keying_material(SSL *s, unsigned char *out, int olen, 
-        char *label, int llen, unsigned char *p, int plen, int use_context)
+int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
+	const char *label, size_t llen, const unsigned char *p, size_t plen,
+	int use_context)
 	{
 	if (s->version < TLS1_VERSION)
 		return -1;

ssl/ssl_locl.h

@@ -571,11 +571,11 @@ typedef struct ssl3_enc_method
 	const char *server_finished_label;
 	int server_finished_label_len;
 	int (*alert_value)(int);
-        int (*export_keying_material)(SSL *, unsigned char *, unsigned int,
-				      const char *, unsigned int,
-				      const unsigned char *, unsigned int,
-				      int use_context);
-	} SSL3_ENC_METHOD;
+	int (*export_keying_material)(SSL *, unsigned char *, size_t,
+				      const char *, size_t,
+				      const unsigned char *, size_t,
+ 				      int use_context);
+ 	} SSL3_ENC_METHOD;
 
 #ifndef OPENSSL_NO_COMP
 /* Used for holding the relevant compression methods loaded into SSL_CTX */
@@ -1068,9 +1068,9 @@ int tls1_cert_verify_mac(SSL *s, int md_nid, unsigned char *p);
 int tls1_mac(SSL *ssl, unsigned char *md, int snd);
 int tls1_generate_master_secret(SSL *s, unsigned char *out,
 	unsigned char *p, int len);
-int tls1_export_keying_material(SSL *s, unsigned char *out, unsigned int olen, 
-	const char *label, unsigned int llen, const unsigned char *p, 
-        unsigned int plen, int use_context);
+int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
+	const char *label, size_t llen,
+	const unsigned char *p, size_t plen, int use_context);
 int tls1_alert_code(int code);
 int ssl3_alert_code(int code);
 int ssl_ok(SSL *s);

ssl/t1_enc.c

@@ -1119,16 +1119,17 @@ int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 	return(SSL3_MASTER_SECRET_SIZE);
 	}
 
-int tls1_export_keying_material(SSL *s, unsigned char *out, unsigned int olen, 
-         const char *label, unsigned int llen, const unsigned char *context, 
-         unsigned int contextlen, int use_context)
+int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
+	 const char *label, size_t llen, const unsigned char *context,
+	 size_t contextlen, int use_context)
 	{
 	unsigned char *buff;
 	unsigned char *val = NULL;
-	unsigned int vallen, currentvalpos, rv;
+	size_t vallen, currentvalpos;
+	int rv;
 
 #ifdef KSSL_DEBUG
-	printf ("tls1_export_keying_material(%p, %p,%d, %s,%d, %p,%d)\n", s, out,olen, label,llen, p,plen);
+	printf ("tls1_export_keying_material(%p,%p,%d,%s,%d,%p,%d)\n", s, out, olen, label, llen, p, plen);
 #endif	/* KSSL_DEBUG */
 
 	buff = OPENSSL_malloc(olen);
@@ -1140,10 +1141,10 @@ int tls1_export_keying_material(SSL *s, unsigned char *out, unsigned int olen,
 	 * does not create a prohibited label.
 	 */
 	vallen = llen + SSL3_RANDOM_SIZE * 2;
-        if (use_context) 
-                {
-                vallen +=  2 + contextlen;
-                }
+	if (use_context)
+		{
+		vallen += 2 + contextlen;
+		}
 
 	val = OPENSSL_malloc(vallen);
 	if (val == NULL) goto err2;
@@ -1155,17 +1156,17 @@ int tls1_export_keying_material(SSL *s, unsigned char *out, unsigned int olen,
 	memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
 	currentvalpos += SSL3_RANDOM_SIZE;
 
-        if (use_context)
-                {
-                val[currentvalpos] = (contextlen << 8) & 0xff;
-                currentvalpos++;
-                val[currentvalpos] = contextlen & 0xff;
-                currentvalpos++;
-                if ((contextlen > 0) || (context != NULL)) 
-                        {
-                        memcpy(val + currentvalpos, context, contextlen);
-                        }
-                }
+	if (use_context)
+		{
+		val[currentvalpos] = (contextlen >> 8) & 0xff;
+		currentvalpos++;
+		val[currentvalpos] = contextlen & 0xff;
+		currentvalpos++;
+		if ((contextlen > 0) || (context != NULL))
+			{
+			memcpy(val + currentvalpos, context, contextlen);
+			}
+		}
 
 	/* disallow prohibited labels
 	 * note that SSL3_RANDOM_SIZE > max(prohibited label len) =
@@ -1181,19 +1182,18 @@ int tls1_export_keying_material(SSL *s, unsigned char *out, unsigned int olen,
 	if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 		 TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0) goto err1;
 
-	tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
-		val, vallen,
-		NULL, 0,
-		NULL, 0,
-		NULL, 0,
-		NULL, 0,
-		s->session->master_key,s->session->master_key_length,
-		out,buff,olen);
+	rv = tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
+		      val, vallen,
+		      NULL, 0,
+		      NULL, 0,
+		      NULL, 0,
+		      NULL, 0,
+		      s->session->master_key,s->session->master_key_length,
+		      out,buff,olen);
 
 #ifdef KSSL_DEBUG
 	printf ("tls1_export_keying_material() complete\n");
 #endif	/* KSSL_DEBUG */
-	rv = olen;
 	goto ret;
 err1:
 	SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);

ssl/tls1.h

@@ -265,8 +265,16 @@ extern "C" {
 
 const char *SSL_get_servername(const SSL *s, const int type);
 int SSL_get_servername_type(const SSL *s);
-int SSL_export_keying_material(SSL *s, unsigned char *out, int olen, 
-        char *label, int llen, unsigned char *p, int plen, int use_context);
+/* SSL_export_keying_material exports a value derived from the master secret,
+ * as specified in RFC 5705. It writes |olen| bytes to |out| given a label and
+ * optional context. (Since a zero length context is allowed, the |use_context|
+ * flag controls whether a context is included.)
+ *
+ * It returns 1 on success and zero otherwise.
+ */
+int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
+	const char *label, size_t llen, const unsigned char *p, size_t plen,
+	int use_context);
 
 #define SSL_set_tlsext_host_name(s,name) \
 SSL_ctrl(s,SSL_CTRL_SET_TLSEXT_HOSTNAME,TLSEXT_NAMETYPE_host_name,(char *)name)