[Dovecot] Automatically Cleaning Kerberos Credential Cache Files

[Joseph Tam]

Ben Morrow writes:

> In any case, it's likely that the delivery process looks in the user's
> home directory even if delivery is to a separate mail spool, unless
> you've taken steps to prevent this.

I can confirm this.  I think the reason is that dovecot changes to the
user's home directory so that it has a place to dump core.  This causes
problem for my setup since I user per-user NFS mounts, so a delivery to an
internal mailing list caused hundreds of NFS automounts.

I patched this behaviour out, but there is probably a more elegant solution
(unset MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS? How?).

Joseph Tam <jtam.home at gmail.com>

--- ./src/lib-storage/mail-storage-service.c~	Sat May 19 08:42:12 2012
+++ ./src/lib-storage/mail-storage-service.c	Mon Jun 25 22:00:57 2012
@@ -615,21 +615,21 @@

-	if ((user->flags & MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP) != 0 &&
-	    (user->flags & MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS) == 0) {
-		/* we don't want to write core files to any users' home
-		   directories since they could contain information about other
-		   users' mails as well. so do no chdiring to home. */
-	} else if (*home != '\0' &&
-		   (user->flags & MAIL_STORAGE_SERVICE_FLAG_NO_CHDIR) == 0) {
-		/* If possible chdir to home directory, so that core file
-		   could be written in case we crash. */
-		if (chdir(home) < 0) {
-			if (errno == EACCES) {
-				i_error("%s", eacces_error_get("chdir",
-						t_strconcat(home, "/", NULL)));
-			} if (errno != ENOENT)
-				i_error("chdir(%s) failed: %m", home);
-			else if (mail_set->mail_debug)
-				i_debug("Home dir not found: %s", home);
-		}
-	}
+//	if ((user->flags & MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP) != 0 &&
+//	    (user->flags & MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS) == 0) {
+//		/* we don't want to write core files to any users' home
+//		   directories since they could contain information about other
+//		   users' mails as well. so do no chdiring to home. */
+//	} else if (*home != '\0' &&
+//		   (user->flags & MAIL_STORAGE_SERVICE_FLAG_NO_CHDIR) == 0) {
+//		/* If possible chdir to home directory, so that core file
+//		   could be written in case we crash. */
+//		if (chdir(home) < 0) {
+//			if (errno == EACCES) {
+//				i_error("%s", eacces_error_get("chdir",
+//						t_strconcat(home, "/", NULL)));
+//			} if (errno != ENOENT)
+//				i_error("chdir(%s) failed: %m", home);
+//			else if (mail_set->mail_debug)
+//				i_debug("Home dir not found: %s", home);
+//		}
+//	}