From 6e0e2e4490ebb9daf1f62ed7a2d30412551772ee Mon Sep 17 00:00:00 2001
From: Dan Harkless <dan@harkless.org>
Date: Thu, 27 Jan 2000 20:12:38 +0000
Subject: [PATCH] Fixed multiple bugs in makedir().  First off, when creating
 nested folders, it only set permissions properly on the
 innermost one.  Secondly, it passwd an octal constant to
 atoi(), which only works on decimal numbers, resulting in
 directories with no user read or execute permission, making
 creation of nested dirs fail.

Also added a comment wondering why we do special processing when euid != uid.
If no one disagrees with my comments, I'll remove that weird code in the future.
---
 sbr/makedir.c |  124 +++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 80 insertions(+), 44 deletions(-)

diff --git a/sbr/makedir.c b/sbr/makedir.c
index 6cf9e03..e4c3c26 100644
--- a/sbr/makedir.c
+++ b/sbr/makedir.c
@@ -19,61 +19,97 @@ extern int errno;
 int
 makedir (char *dir)
 {
-    pid_t pid;
-    register char *cp;
-    register char *c;
-    char path[PATH_MAX];
+    char            path[PATH_MAX];
+    char*           folder_perms_ASCII;
+    int             had_an_error = 0;
+    mode_t          folder_perms, saved_umask;
+    pid_t           pid;
+    register char*  c;
 
     context_save();	/* save the context file */
     fflush(stdout);
 
-    if (getuid () == geteuid ()) {
-	    c = strncpy(path, dir, sizeof(path));     
+    if (!(folder_perms_ASCII = context_find ("folder-protect")))
+	folder_perms_ASCII = foldprot;  /* defaults to "0700" */
+    
+    /* Call strtoul() with radix=0, which means it'll determine the base by
+       looking at the first digit.  That way it'll know "0700" is an octal
+       constant (and if someone gets wacky and changes the representation to hex
+       it'll still work). */
+    folder_perms = strtoul(folder_perms_ASCII, NULL, 0);
 
-	    while ((c = strchr((c + 1), '/')) != NULL) {	
-		    *c = (char)0;
-		    if (access(path, X_OK)) {
-			    if (errno != ENOENT){
-				    advise (dir, "unable to create directory");
-				    return 0;
-			    }			    
-			    if (mkdir(path, 0775)) {
-				    advise (dir, "unable to create directory");
-				    return 0;
-			    }
-		    }
-		    *c = '/';
-	    }
- 
-	    if (mkdir (dir, 0755) == -1) {
+    /* Folders have definite desired permissions that are set -- we don't want
+       to interact with the umask.  Clear it temporarily. */
+    saved_umask = umask(0);
+
+    if (getuid () == geteuid ()) {
+	c = strncpy(path, dir, sizeof(path));     
+	
+	while (!had_an_error && (c = strchr((c + 1), '/')) != NULL) {	
+	    *c = (char)0;
+	    if (access(path, X_OK)) {
+		if (errno != ENOENT){
 		    advise (dir, "unable to create directory");
-		    return 0;
+		    had_an_error = 1;
+		}
+		/* Create an outer directory. */
+		if (mkdir(path, folder_perms)) {
+		    advise (dir, "unable to create directory");
+		    had_an_error = 1;
+		}
 	    }
-    } else {
-	switch (pid = vfork()) {
-	case -1: 
-	    advise ("fork", "unable to");
-	    return 0;
-
-	case 0: 
-	    setgid (getgid ());
-	    setuid (getuid ());
+	    *c = '/';
+	}
 
-	    execl ("/bin/mkdir", "mkdir", dir, NULL);
-	    execl ("/usr/bin/mkdir", "mkdir", dir, NULL);
-	    fprintf (stderr, "unable to exec ");
-	    perror ("mkdir");
-	    _exit (-1);
+	if (!had_an_error) {
+	    /* Create the innermost nested subdirectory of the path we're being
+	       asked to create. */
+	    if (mkdir (dir, folder_perms) == -1) {
+		advise (dir, "unable to create directory");
+		had_an_error = 1;
+	    }
+	}
+    }
+    else {
+	/* Ummm, why do we want to avoid creating directories with the effective
+	   user ID?  None of the nmh tools are installed such that the effective
+	   should be different from the real, and if some parent process made
+	   the two be different, I don't see why it should be our job to enforce
+	   the real UID.  Also, why the heck do we call the mkdir executable
+	   rather than the library function in this case??  If we do want to
+	   call the mkdir executable, we should at least be giving it -p (and
+	   change the single chmod() call below) so it can successfully create
+	   nested directories like the above code can.
 
-	default: 
-	    if (pidXwait(pid, "mkdir"))
+	   -- Dan Harkless <dan-nmh@dilvish.speed.net> */
+	switch (pid = vfork()) {
+	    case -1: 
+		advise ("fork", "unable to");
 		return 0;
-	    break;
+		
+	    case 0: 
+		setgid (getgid ());
+		setuid (getuid ());
+		
+		execl ("/bin/mkdir", "mkdir", dir, NULL);
+		execl ("/usr/bin/mkdir", "mkdir", dir, NULL);
+		fprintf (stderr, "unable to exec ");
+		perror ("mkdir");
+		_exit (-1);
+		
+	    default: 
+		if (pidXwait(pid, "mkdir"))
+		    return 0;
+		break;
 	}
+
+	chmod (dir, folder_perms);
     }
 
-    if (!(cp = context_find ("folder-protect")))
-	cp = foldprot;
-    chmod (dir, atooi (cp));
-    return 1;
+    umask(saved_umask);  /* put the user's umask back */
+
+    if (had_an_error)
+	return 0;  /* opposite of UNIX error return convention */
+    else
+	return 1;
 }
-- 
1.7.10.4