Add SE Linux support to vipw/vigr

Fixes: #491907

Status wrt upsream: Still not applied.

Index: shadow-4.1.1/src/vipw.c
===================================================================
--- shadow-4.1.1.orig/src/vipw.c	2008-07-26 01:00:51.095214653 +0200
+++ shadow-4.1.1/src/vipw.c	2008-07-26 01:12:49.295214798 +0200
@@ -42,6 +42,10 @@
 #include "sgroupio.h"
 #include "shadowio.h"
 
+#ifdef WITH_SELINUX                                                            
+#include <selinux/selinux.h>                                                   
+#endif
+
 #define MSG_WARN_EDIT_OTHER_FILE _( \
 	"You have modified %s.\n"\
 	"You may need to modify %s for consistency.\n"\
@@ -167,6 +171,22 @@
 	if (access (file, F_OK) != 0) {
 		vipwexit (file, 1, 1);
 	}
+#ifdef WITH_SELINUX
+	/* if SE Linux is enabled then set the context of all new files
+	   to be the context of the file we are editing */
+	if (is_selinux_enabled ()) {
+		security_context_t passwd_context=NULL;
+		int ret = 0;
+		if (getfilecon (file, &passwd_context) < 0) {
+			vipwexit (_("Couldn't get file context"), errno, 1);
+		}
+		ret = setfscreatecon (passwd_context);
+		freecon (passwd_context);
+		if (0 != ret) {
+			vipwexit (_("setfscreatecon () failed"), errno, 1);
+		}
+	}
+#endif
 	if (file_lock () == 0) {
 		vipwexit (_("Couldn't lock file"), errno, 5);
 	}
@@ -236,6 +256,14 @@
 			 progname, file, strerror (errno), fileedit);
 		vipwexit (0, 0, 1);
 	}
+#ifdef WITH_SELINUX                                                            
+	/* unset the fscreatecon */                                             
+	if (is_selinux_enabled ()) {
+		if (setfscreatecon (NULL)) {
+			vipwexit (_("setfscreatecon() failed"), errno, 1);
+		}
+	}
+#endif
 
 	(*file_unlock) ();
 }