From 9d9c6950d059e55a6222b4290912dd472b279dff Mon Sep 17 00:00:00 2001 From: Jeremy Allison Date: Tue, 9 Feb 2016 12:47:43 -0800 Subject: [PATCH] s3: smbd: posix_acls: Fix check for setting u:g:o entry on a filesystem with no ACL support. Since 4.0.x we add 2 additional ACE entries, one SMB_ACL_USER and SMB_ACL_GROUP to match the existing SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries. The two additional entries break the simple "must have 3 entries" check done inside convert_canon_ace_to_posix_perms(). Replace this with a more complete test. BUG: https://bugzilla.samba.org/show_bug.cgi?id=10489 Problem and initial fix provided by Signed-off-by: Jeremy Allison --- source3/smbd/posix_acls.c | 37 ++++++++++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) diff --git a/source3/smbd/posix_acls.c b/source3/smbd/posix_acls.c index 660c0e4..b621653 100644 --- a/source3/smbd/posix_acls.c +++ b/source3/smbd/posix_acls.c @@ -3085,7 +3085,7 @@ static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file canon_ace *group_ace = NULL; canon_ace *other_ace = NULL; - if (ace_count != 3) { + if (ace_count > 5) { DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE " "entries for file %s to convert to posix perms.\n", fsp_str_dbg(fsp))); @@ -3107,6 +3107,41 @@ static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file return False; } + /* + * Ensure all ACE entries are owner, group or other. + * We can't set if there are any other SIDs. + */ + for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) { + if (ace_p == owner_ace || ace_p == group_ace || + ace_p == other_ace) { + continue; + } + if (ace_p->owner_type == UID_ACE) { + if (ace_p->unix_ug.id != owner_ace->unix_ug.id) { + DEBUG(3,("Invalid uid %u in ACE for file %s.\n", + (unsigned int)ace_p->unix_ug.id, + fsp_str_dbg(fsp))); + return false; + } + } else if (ace_p->owner_type == GID_ACE) { + if (ace_p->unix_ug.id != group_ace->unix_ug.id) { + DEBUG(3,("Invalid gid %u in ACE for file %s.\n", + (unsigned int)ace_p->unix_ug.id, + fsp_str_dbg(fsp))); + return false; + } + } + /* + * There should be no duplicate WORLD_ACE entries. + */ + + DEBUG(3,("Invalid type %u, uid %u in ACE for file %s.\n", + (unsigned int)ace_p->owner_type, + (unsigned int)ace_p->unix_ug.id, + fsp_str_dbg(fsp))); + return false; + } + *posix_perms = (mode_t)0; *posix_perms |= owner_ace->perms; -- 2.7.0.rc3.207.g0ac5344