From 1854e7b8e56a907d25a0614288d21a5f223cb279 Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra@samba.org>
Date: Sat, 17 May 2003 00:46:28 +0000
Subject: Cope with cumulative permissions sets. This code is #ifdef'ed out at
 the moment as I don't think cumulative permission sets make sense in POSIX
 even though that's the way Windows works.... Jeremy. (This used to be commit
 6ddd5b6ca7dde45ce866f852861e143434c84c7e)

---
 source3/smbd/posix_acls.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/source3/smbd/posix_acls.c b/source3/smbd/posix_acls.c
index aaf71c82ca..3824afe3c4 100644
--- a/source3/smbd/posix_acls.c
+++ b/source3/smbd/posix_acls.c
@@ -1171,7 +1171,7 @@ Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
 /****************************************************************************
  ASCII art time again... JRA :-).
 
- We have 3 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
+ We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
  entries). Secondly, the merge code has ensured that all duplicate SID entries for
  allow or deny have been merged, so the same SID can only appear once in the deny
@@ -1244,6 +1244,15 @@ Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
  best we can do and has the advantage of failing closed rather
  than open.
  ---------------------------------------------------------------------------
+ Fourth pass - cope with cumulative permissions.
+
+ for all allow user entries, if there exists an allow group entry with
+ more permissive permissions, and the user is in that group, rewrite the
+ allow user permissions to contain both sets of permissions.
+
+ Currently the code for this is #ifdef'ed out as these semantics make
+ no sense to me. JRA.
+ ---------------------------------------------------------------------------
 
  Note we *MUST* do the deny user pass first as this will convert deny user
  entries into allow user entries which can then be processed by the deny
@@ -1433,6 +1442,45 @@ static void process_deny_list( canon_ace **pp_ace_list )
 
 	}
 
+	/* Doing this fourth pass allows Windows semantics to be layered
+	 * on top of POSIX semantics. I'm not sure if this is desirable.
+	 * For example, in W2K ACLs there is no way to say, "Group X no
+	 * access, user Y full access" if user Y is a member of group X.
+	 * This seems completely broken semantics to me.... JRA.
+	 */
+
+#if 0
+	/* Pass 4 above - deal with allow entries. */
+
+	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
+		canon_ace *allow_ace_p;
+
+		curr_ace_next = curr_ace->next; /* So we can't lose the link. */
+
+		if (curr_ace->attr != ALLOW_ACE)
+			continue;
+
+		if (curr_ace->owner_type != UID_ACE)
+			continue;
+
+		for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
+
+			if (allow_ace_p->attr != ALLOW_ACE)
+				continue;
+
+			/* We process GID_ACE entries only. */
+
+			if (allow_ace_p->owner_type != GID_ACE)
+				continue;
+
+			/* OR in the group perms. */
+
+			if (uid_entry_in_group( curr_ace, allow_ace_p))
+				curr_ace->perms |= allow_ace_p->perms;
+		}
+	}
+#endif
+
 	*pp_ace_list = ace_list;
 }
 
-- 
cgit