Remove code writing .Xauthority in /tmp if it cannot write it in ${HOME}.

Discussed with deraadt@ and zhuk@

5 files changed, 6 insertions, 62 deletions

diff --git a/include/dm.h b/include/dm.h
index ab67e33..a07af64 100644
--- a/include/dm.h
+++ b/include/dm.h
@@ -122,7 +122,6 @@ struct display {
 	char		**authNames;	/* authorization protocol names */
 	unsigned short	*authNameLens;	/* authorization protocol name lens */
 	char		*clientAuthFile;/* client specified auth file */
-	char		*userAuthDir;	/* backup directory for tickets */
 	int		authComplain;	/* complain when no auth for XDMCP */
 
 	/* information potentially derived from resources */
diff --git a/man/xenodm.man b/man/xenodm.man
index 3ba85dc..071f600 100644
--- a/man/xenodm.man
+++ b/man/xenodm.man
@@ -23,7 +23,7 @@
 .\" from The Open Group.
 .\"
 .\"
-.Dd $Mdocdate: August 15 2019 $
+.Dd $Mdocdate: March 8 2021 $
 .Dt XENODM 1
 .Os __xorgversion__
 .Sh NAME
@@ -582,18 +582,6 @@ to occur, during which time the new authorization information will be read.
 The default is
 .Cm false ,
 which will work for all MIT servers.
-.It Ic DisplayManager. Ns Ar DISPLAY Ns Ic .userAuthDir
-When
-.Nm
-is unable to write to the usual user authorization file
-.Pq Pa $HOME/.Xauthority ,
-it creates a unique file name in this directory and points the environment
-variable
-.Ev XAUTHORITY
-at the created file.
-It uses
-.Pa /tmp
-by default.
 .El
 .Sh CONFIGURATION FILE
 First, the
diff --git a/xenodm/auth.c b/xenodm/auth.c
index b2e29b3..39703c1 100644
--- a/xenodm/auth.c
+++ b/xenodm/auth.c
@@ -752,7 +752,7 @@ void
 SetUserAuthorization (struct display *d, struct verify_info *verify)
 {
     FILE	*old = NULL, *new;
-    char	home_name[1024], backup_name[1024], new_name[1024];
+    char	home_name[1024], new_name[1024];
     char	*name = NULL;
     char	*home;
     char	*envname = NULL;
@@ -762,7 +762,6 @@ SetUserAuthorization (struct display *d, struct verify_info *verify)
     struct stat	statb;
     int		i;
     int		magicCookie;
-    int		fd;
 
     Debug ("SetUserAuthorization\n");
     auths = d->authorizations;
@@ -793,45 +792,10 @@ SetUserAuthorization (struct display *d, struct verify_info *verify)
 	    }
 	}
 	if (lockStatus != LOCK_SUCCESS) {
-	    snprintf (backup_name, sizeof(backup_name),
-		      "%s/.XauthXXXXXX", d->userAuthDir);
-	    fd = mkstemp (backup_name);
-	    if (fd >= 0) {
-		old = fdopen (fd, "r");
-		if (old == NULL)
-		    (void) close(fd);
-	    }
-
-	    if (old != NULL)
-	    {
-		lockStatus = XauLockAuth (backup_name, 1, 2, 10);
-		Debug ("backup lock is %d\n", lockStatus);
-		if (lockStatus == LOCK_SUCCESS) {
-		    if (openFiles (backup_name, new_name, sizeof(new_name),
-                                   &old, &new)
-			&& (old != NULL) && (new != NULL)) {
-			name = backup_name;
-			setenv = 1;
-		    } else {
-			XauUnlockAuth (backup_name);
-			lockStatus = LOCK_ERROR;
-			if (old != NULL) {
-			    (void) fclose (old);
-			    old = NULL;
-			}
-			if (new != NULL)
-			    (void) fclose (new);
-		    }
-		} else {
-		    (void) fclose (old);
-		}
-	    }
-	}
-	if (lockStatus != LOCK_SUCCESS) {
-	    Debug ("can't lock auth file %s or backup %s\n",
-			    home_name, backup_name);
-	    LogError ("can't lock authorization file %s or backup %s\n",
-			    home_name, backup_name);
+	    Debug ("can't lock auth file %s\n",
+			    home_name);
+	    LogError ("can't lock authorization file %s\n",
+			    home_name);
 	    return;
 	}
 	initAddrs ();
diff --git a/xenodm/dpylist.c b/xenodm/dpylist.c
index f70086b..0d773e5 100644
--- a/xenodm/dpylist.c
+++ b/xenodm/dpylist.c
@@ -128,7 +128,6 @@ RemoveDisplay (struct display *old)
 	    if (d->authFile)
 		(void) unlink (d->authFile);
 	    free (d->authFile);
-	    free (d->userAuthDir);
 	    for (x = d->authNames; x && *x; x++)
 		free (*x);
 	    free (d->authNames);
@@ -195,7 +194,6 @@ NewDisplay (char *name, char *class)
     d->authNameNum = 0;
     d->clientAuthFile = NULL;
     d->authFile = NULL;
-    d->userAuthDir = NULL;
     d->authNames = NULL;
     d->authNameLens = NULL;
     d->authComplain = 1;
diff --git a/xenodm/resource.c b/xenodm/resource.c
index c661046..3166f38 100644
--- a/xenodm/resource.c
+++ b/xenodm/resource.c
@@ -91,9 +91,6 @@ char	**exportList;
 #ifndef DEF_AUTH_DIR
 # define DEF_AUTH_DIR "/usr/lib/X11/xenodm"
 #endif
-#ifndef DEF_USER_AUTH_DIR
-# define DEF_USER_AUTH_DIR	"/tmp"
-#endif
 #ifndef DEF_ACCESS_FILE
 # define DEF_ACCESS_FILE	""
 #endif
@@ -200,8 +197,6 @@ struct displayResource sessionResources[] = {
 				DEF_SYSTEM_SHELL },
 { "failsafeClient","FailsafeClient",	DM_STRING,	boffset(failsafeClient),
 				DEF_FAILSAFE_CLIENT },
-{ "userAuthDir","UserAuthDir",	DM_STRING,	boffset(userAuthDir),
-				DEF_USER_AUTH_DIR },
 };
 
 #define NUM_SESSION_RESOURCES	(sizeof sessionResources/\