Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 292 insertions, 0 deletions

diff --git a/src/tls/tls_proxy_clnt.c b/src/tls/tls_proxy_clnt.c
new file mode 100644
index 0000000..beeafa7
--- /dev/null
+++ b/src/tls/tls_proxy_clnt.c
@@ -0,0 +1,292 @@
+/*++
+/* NAME
+/*	tlsproxy_clnt 3
+/* SUMMARY
+/*	tlsproxy(8) client support
+/* SYNOPSIS
+/*	#include <tlsproxy_clnt.h>
+/*
+/*	VSTREAM *tls_proxy_open(service, flags, peer_stream, peer_addr,
+/*				peer_port, handshake_timeout, session_timeout,
+/*				serverid, tls_params, init_props, start_props)
+/*	const char *service;
+/*	int	flags;
+/*	VSTREAM *peer_stream;
+/*	const char *peer_addr;
+/*	const char *peer_port;
+/*	int	handshake_timeout;
+/*	int	session_timeout;
+/*	const char *serverid;
+/*	void	*tls_params;
+/*	void	*init_props;
+/*	void	*start_props;
+/*
+/*	TLS_SESS_STATE *tls_proxy_context_receive(proxy_stream)
+/*	VSTREAM *proxy_stream;
+/* AUXILIARY FUNCTIONS
+/*	VSTREAM *tls_proxy_legacy_open(service, flags, peer_stream,
+/*					peer_addr, peer_port,
+/*					timeout, serverid)
+/*	const char *service;
+/*	int	flags;
+/*	VSTREAM *peer_stream;
+/*	const char *peer_addr;
+/*	const char *peer_port;
+/*	int	timeout;
+/*	const char *serverid;
+/* DESCRIPTION
+/*	tls_proxy_open() prepares for inserting the tlsproxy(8)
+/*	daemon between the current process and a remote peer (the
+/*	actual insert operation is described in the next paragraph).
+/*	The result value is a null pointer on failure. The peer_stream
+/*	is not closed.  The resulting proxy stream is single-buffered.
+/*
+/*	After this, it is a good idea to use the CA_VSTREAM_CTL_SWAP_FD
+/*	request to swap the file descriptors between the plaintext
+/*	peer_stream and the proxy stream from tls_proxy_open().
+/*	This avoids the loss of application-configurable VSTREAM
+/*	attributes on the plaintext peer_stream (such as longjmp
+/*	buffer, timeout, etc.). Once the file descriptors are
+/*	swapped, the proxy stream should be closed.
+/*
+/*	tls_proxy_context_receive() receives the TLS context object
+/*	for the named proxy stream. This function must be called
+/*	only if the TLS_PROXY_SEND_CONTEXT flag was specified in
+/*	the tls_proxy_open() call. Note that this TLS context object
+/*	is not compatible with tls_session_free(). It must be given
+/*	to tls_proxy_context_free() instead.
+/*
+/*	After this, the proxy_stream is ready for plain-text I/O.
+/*
+/*	tls_proxy_legacy_open() is a backwards-compatibility feature
+/*	that provides a historical interface.
+/*
+/*	Arguments:
+/* .IP service
+/*	The (base) name of the tlsproxy service.
+/* .IP flags
+/*	Bit-wise OR of:
+/* .RS
+/* .IP TLS_PROXY_FLAG_ROLE_SERVER
+/*	Request the TLS server proxy role.
+/* .IP TLS_PROXY_FLAG_ROLE_CLIENT
+/*	Request the TLS client proxy role.
+/* .IP TLS_PROXY_FLAG_SEND_CONTEXT
+/*	Send the TLS context object.
+/* .RE
+/* .IP peer_stream
+/*	Stream that connects the current process to a remote peer.
+/* .IP peer_addr
+/*	Printable IP address of the remote peer_stream endpoint.
+/* .IP peer_port
+/*	Printable TCP port of the remote peer_stream endpoint.
+/* .IP handshake_timeout
+/*	Time limit that the tlsproxy(8) daemon should use during
+/*	the TLS handshake.
+/* .IP session_timeout
+/*	Time limit that the tlsproxy(8) daemon should use after the
+/*	TLS handshake.
+/* .IP serverid
+/*	Unique service identifier.
+/* .IP tls_params
+/*	Pointer to TLS_CLIENT_PARAMS or TLS_SERVER_PARAMS.
+/* .IP init_props
+/*	Pointer to TLS_CLIENT_INIT_PROPS or TLS_SERVER_INIT_PROPS.
+/* .IP start_props
+/*	Pointer to TLS_CLIENT_START_PROPS or TLS_SERVER_START_PROPS.
+/* .IP proxy_stream
+/*	Stream from tls_proxy_open().
+/* .IP tls_context
+/*	TLS session object from tls_proxy_context_receive().
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+#ifdef USE_TLS
+
+/* System library. */
+
+#include <sys_defs.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <connect.h>
+#include <stringops.h>
+#include <vstring.h>
+
+/* Global library. */
+
+#include <mail_proto.h>
+#include <mail_params.h>
+
+/* TLS library-specific. */
+
+#include <tls.h>
+#include <tls_proxy.h>
+
+#define TLSPROXY_INIT_TIMEOUT		10
+
+/* SLMs. */
+
+#define STR	vstring_str
+
+/* tls_proxy_open - open negotiations with TLS proxy */
+
+VSTREAM *tls_proxy_open(const char *service, int flags,
+			        VSTREAM *peer_stream,
+			        const char *peer_addr,
+			        const char *peer_port,
+			        int handshake_timeout,
+			        int session_timeout,
+			        const char *serverid,
+			        void *tls_params,
+			        void *init_props,
+			        void *start_props)
+{
+    const char myname[] = "tls_proxy_open";
+    VSTREAM *tlsproxy_stream;
+    int     status;
+    int     fd;
+    static VSTRING *tlsproxy_service = 0;
+    static VSTRING *remote_endpt = 0;
+
+    /*
+     * Initialize.
+     */
+    if (tlsproxy_service == 0) {
+	tlsproxy_service = vstring_alloc(20);
+	remote_endpt = vstring_alloc(20);
+    }
+
+    /*
+     * Connect to the tlsproxy(8) daemon.
+     */
+    vstring_sprintf(tlsproxy_service, "%s/%s", MAIL_CLASS_PRIVATE, service);
+    if ((fd = LOCAL_CONNECT(STR(tlsproxy_service), BLOCKING,
+			    TLSPROXY_INIT_TIMEOUT)) < 0) {
+	msg_warn("connect to %s service: %m", STR(tlsproxy_service));
+	return (0);
+    }
+
+    /*
+     * Initial handshake. Send common data attributes now, and send the
+     * remote peer file descriptor in a later transaction.
+     */
+    tlsproxy_stream = vstream_fdopen(fd, O_RDWR);
+    vstring_sprintf(remote_endpt, "[%s]:%s", peer_addr, peer_port);
+    attr_print(tlsproxy_stream, ATTR_FLAG_NONE,
+	       SEND_ATTR_STR(TLS_ATTR_REMOTE_ENDPT, STR(remote_endpt)),
+	       SEND_ATTR_INT(TLS_ATTR_FLAGS, flags),
+	       SEND_ATTR_INT(TLS_ATTR_TIMEOUT, handshake_timeout),
+	       SEND_ATTR_INT(TLS_ATTR_TIMEOUT, session_timeout),
+	       SEND_ATTR_STR(TLS_ATTR_SERVERID, serverid),
+	       ATTR_TYPE_END);
+    /* Do not flush the stream yet. */
+    if (vstream_ferror(tlsproxy_stream) != 0) {
+	msg_warn("error sending request to %s service: %m",
+		 STR(tlsproxy_service));
+	vstream_fclose(tlsproxy_stream);
+	return (0);
+    }
+    switch (flags & (TLS_PROXY_FLAG_ROLE_CLIENT | TLS_PROXY_FLAG_ROLE_SERVER)) {
+    case TLS_PROXY_FLAG_ROLE_CLIENT:
+	attr_print(tlsproxy_stream, ATTR_FLAG_NONE,
+		   SEND_ATTR_FUNC(tls_proxy_client_param_print, tls_params),
+		   SEND_ATTR_FUNC(tls_proxy_client_init_print, init_props),
+		   SEND_ATTR_FUNC(tls_proxy_client_start_print, start_props),
+		   ATTR_TYPE_END);
+	break;
+    case TLS_PROXY_FLAG_ROLE_SERVER:
+#if 0
+	attr_print(tlsproxy_stream, ATTR_FLAG_NONE,
+		   SEND_ATTR_FUNC(tls_proxy_server_param_print, tls_params),
+		   SEND_ATTR_FUNC(tls_proxy_server_init_print, init_props),
+		   SEND_ATTR_FUNC(tls_proxy_server_start_print, start_props),
+		   ATTR_TYPE_END);
+#endif
+	break;
+    default:
+	msg_panic("%s: bad flags: 0x%x", myname, flags);
+    }
+    if (vstream_fflush(tlsproxy_stream) != 0) {
+	msg_warn("error sending request to %s service: %m",
+		 STR(tlsproxy_service));
+	vstream_fclose(tlsproxy_stream);
+	return (0);
+    }
+
+    /*
+     * Receive the "TLS is available" indication.
+     * 
+     * This may seem out of order, but we must have a read transaction between
+     * sending the request attributes and sending the plaintext file
+     * descriptor. We can't assume UNIX-domain socket semantics here.
+     */
+    if (attr_scan(tlsproxy_stream, ATTR_FLAG_STRICT,
+		  RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+    /* TODO: informative message. */
+		  ATTR_TYPE_END) != 1 || status == 0) {
+
+	/*
+	 * The TLS proxy reports that the TLS engine is not available (due to
+	 * configuration error, or other causes).
+	 */
+	msg_warn("%s service role \"%s\" is not available",
+		 STR(tlsproxy_service),
+		 (flags & TLS_PROXY_FLAG_ROLE_SERVER) ? "server" :
+		 (flags & TLS_PROXY_FLAG_ROLE_CLIENT) ? "client" :
+		 "bogus role");
+	vstream_fclose(tlsproxy_stream);
+	return (0);
+    }
+
+    /*
+     * Send the remote peer file descriptor.
+     */
+    if (LOCAL_SEND_FD(vstream_fileno(tlsproxy_stream),
+		      vstream_fileno(peer_stream)) < 0) {
+
+	/*
+	 * Some error: drop the TLS proxy stream.
+	 */
+	msg_warn("sending file handle to %s service: %m",
+		 STR(tlsproxy_service));
+	vstream_fclose(tlsproxy_stream);
+	return (0);
+    }
+    return (tlsproxy_stream);
+}
+
+
+/* tls_proxy_context_receive - receive TLS session object from tlsproxy(8) */
+
+TLS_SESS_STATE *tls_proxy_context_receive(VSTREAM *proxy_stream)
+{
+    TLS_SESS_STATE *tls_context = 0;
+
+    if (attr_scan(proxy_stream, ATTR_FLAG_STRICT,
+	      RECV_ATTR_FUNC(tls_proxy_context_scan, (void *) &tls_context),
+		  ATTR_TYPE_END) != 1) {
+	if (tls_context)
+	    tls_proxy_context_free(tls_context);
+	return (0);
+    } else {
+	return (tls_context);
+    }
+}
+
+#endif