Second part of fix for bug #8443 - Default user entry is set to minimal permissions on incoming ACL change with no user specified.

Be smarter about setting default permissions when a ACL_USER_OBJ isn't given. Use the principle of least surprises for the user.
(cherry picked from commit abf0629535a8082229810c6905c356b20c482be9)

1 files changed, 11 insertions, 8 deletions

diff --git a/source3/smbd/posix_acls.c b/source3/smbd/posix_acls.c
index 1457ec1bde8..555f9c00fd2 100644
--- a/source3/smbd/posix_acls.c
+++ b/source3/smbd/posix_acls.c
@@ -1397,29 +1397,32 @@ static bool ensure_canon_entry_valid(canon_ace **pp_ace,
 		pace->unix_ug.uid = pst->st_ex_uid;
 		pace->trustee = *pfile_owner_sid;
 		pace->attr = ALLOW_ACE;
+		/* Start with existing permissions, principle of least
+		   surprises for the user. */
+		pace->perms = pst->st_ex_mode;
 
 		if (setting_acl) {
 			/* See if the owning user is in any of the other groups in
-			   the ACE. If so, OR in the permissions from that group. */
+			   the ACE, or if there's a matching user entry.
+			   If so, OR in the permissions from that entry. */
 
-			bool group_matched = False;
 			canon_ace *pace_iter;
 
 			for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
-				if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
+				if (pace_iter->type == SMB_ACL_USER &&
+						pace_iter->unix_ug.uid == pace->unix_ug.uid) {
+					pace->perms |= pace_iter->perms;
+				} else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
 					if (uid_entry_in_group(pace, pace_iter)) {
 						pace->perms |= pace_iter->perms;
-						group_matched = True;
 					}
 				}
 			}
 
-			/* If we only got an "everyone" perm, just use that. */
-			if (!group_matched) {
+			if (pace->perms == 0) {
+				/* If we only got an "everyone" perm, just use that. */
 				if (got_other)
 					pace->perms = pace_other->perms;
-				else
-					pace->perms = 0;
 			}
 
 			apply_default_perms(params, is_directory, pace, S_IRUSR);