diff -up openssh-7.4p1/sftp-server.8.sftp-force-mode openssh-7.4p1/sftp-server.8

--- openssh-7.4p1/sftp-server.8.sftp-force-mode	2016-12-19 05:59:41.000000000 +0100

+++ openssh-7.4p1/sftp-server.8	2017-02-09 10:35:41.926475399 +0100

@@ -38,6 +38,7 @@

 .Op Fl P Ar blacklisted_requests

 .Op Fl p Ar whitelisted_requests

 .Op Fl u Ar umask

+.Op Fl m Ar force_file_perms

 .Ek

 .Nm

 .Fl Q Ar protocol_feature

@@ -138,6 +139,10 @@ Sets an explicit

 .Xr umask 2

 to be applied to newly-created files and directories, instead of the

 user's default mask.

+.It Fl m Ar force_file_perms

+Sets explicit file permissions to be applied to newly-created files instead

+of the default or client requested mode.  Numeric values include:

+777, 755, 750, 666, 644, 640, etc.  Option -u is ineffective if -m is set.

 .El

 .Pp

 On some systems,

diff -up openssh-7.4p1/sftp-server.c.sftp-force-mode openssh-7.4p1/sftp-server.c

--- openssh-7.4p1/sftp-server.c.sftp-force-mode	2017-02-09 10:22:36.498019921 +0100

+++ openssh-7.4p1/sftp-server.c	2017-02-09 10:35:07.190520959 +0100

@@ -65,6 +65,10 @@ struct sshbuf *oqueue;

 /* Version of client */

 static u_int version;

+/* Force file permissions */

+int permforce = 0;

+long permforcemode;

+

 /* SSH2_FXP_INIT received */

 static int init_done;

@@ -679,6 +683,7 @@ process_open(u_int32_t id)

 	Attrib a;

 	char *name;

 	int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;

+	mode_t old_umask = 0;

 	if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||

 	    (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */

@@ -688,6 +693,10 @@ process_open(u_int32_t id)

 	debug3("request %u: open flags %d", id, pflags);

 	flags = flags_from_portable(pflags);

 	mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;

+	if (permforce == 1) {   /* Force perm if -m is set */

+		mode = permforcemode;

+		old_umask = umask(0); /* so umask does not interfere */

+	}

 	logit("open \"%s\" flags %s mode 0%o",

 	    name, string_from_portable(pflags), mode);

 	if (readonly &&

@@ -709,6 +718,8 @@ process_open(u_int32_t id)

 			}

 		}

 	}

+	if (permforce == 1)

+		(void) umask(old_umask); /* restore umask to something sane */

 	if (status != SSH2_FX_OK)

 		send_status(id, status);

 	free(name);

@@ -1490,7 +1501,7 @@ sftp_server_usage(void)

 	fprintf(stderr,

 	    "usage: %s [-ehR] [-d start_directory] [-f log_facility] "

 	    "[-l log_level]\n\t[-P blacklisted_requests] "

-	    "[-p whitelisted_requests] [-u umask]\n"

+	    "[-p whitelisted_requests] [-u umask] [-m force_file_perms]\n"

 	    "       %s -Q protocol_feature\n",

 	    __progname, __progname);

 	exit(1);

@@ -1516,7 +1527,7 @@ sftp_server_main(int argc, char **argv,

 	pw = pwcopy(user_pw);

 	while (!skipargs && (ch = getopt(argc, argv,

-	    "d:f:l:P:p:Q:u:cehR")) != -1) {

+	    "d:f:l:P:p:Q:u:m:cehR")) != -1) {

 		switch (ch) {

 		case 'Q':

 			if (strcasecmp(optarg, "requests") != 0) {

@@ -1576,6 +1587,15 @@ sftp_server_main(int argc, char **argv,

 				fatal("Invalid umask \"%s\"", optarg);

 			(void)umask((mode_t)mask);

 			break;

+		case 'm':

+			/* Force permissions on file received via sftp */

+			permforce = 1;

+			permforcemode = strtol(optarg, &cp, 8);

+			if (permforcemode < 0 || permforcemode > 0777 ||

+			    *cp != '\0' || (permforcemode == 0 &&

+			    errno != 0))

+				fatal("Invalid file mode \"%s\"", optarg);

+			break;

 		case 'h':

 		default:

 			sftp_server_usage();