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* sec_acl.cc (search_ace): Use id == -1, instead of < 0, as wildcard.

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(setacl): Start the search for a matching default at the next entry.
	Invalidate the type of merged entries instead of clearing it.
	Use well_known_creator for default owner and owning group and do
	not try to merge non-default and default entries in these cases.
	(getacl): Recognize well_known_creator for default owner and group.
	(acl_worker): Improve errno settings and streamline the nontsec case.
	* security.cc (write_sd): Remove the call to set_process_privilege.
	(alloc_sd): If the owner changes, call set_process_privilege and return
	immediately on failure. Change inheritance rules: on new directories add
	inherit only allow ACEs for creator_owner, creator_group and everyone.
	Preserve all inheritances through chmod and chown calls. Introduce
	isownergroup to implement the uid == gid case, to keep the inheritance
	code simple. Do not initialize owner_sid and group_sid and stop using
	the variable psd.
This commit is contained in:
Corinna Vinschen
2003-01-12 11:38:51 +00:00
parent a545b16de6
commit ab2dbccc11
3 changed files with 156 additions and 97 deletions
Download Patch File Download Diff File Expand all files Collapse all files

127
winsup/cygwin/security.cc
View File

@ -1,6 +1,6 @@
/* security.cc: NT security functions
Copyright 1997, 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
Originaly written by Gunther Ebert, gunther.ebert@ixos-leipzig.de
Completely rewritten by Corinna Vinschen <corinna@vinschen.de>
@ -1142,14 +1142,6 @@ write_sd (const char *file, PSECURITY_DESCRIPTOR sd_buf, DWORD sd_size)
return -1;
}
/* No need to be thread save. */
static BOOL first_time = TRUE;
if (first_time)
{
set_process_privilege (SE_RESTORE_NAME);
first_time = FALSE;
}
HANDLE fh;
fh = CreateFile (file,
WRITE_OWNER | WRITE_DAC,
@ -1558,7 +1550,7 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
debug_printf ("GetSecurityDescriptorGroup %E");
/* Get SID of owner. */
cygsid owner_sid (NO_SID);
cygsid owner_sid;
/* Check for current user first */
if (uid == myself->uid)
owner_sid = cygheap->user.sid ();
@ -1571,8 +1563,13 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
}
owner_sid.debug_print ("alloc_sd: owner SID =");
/* Must have SE_RESTORE_NAME privilege to change owner */
if (cur_owner_sid && owner_sid != cur_owner_sid
&& set_process_privilege (SE_RESTORE_NAME) < 0 )
return NULL;
/* Get SID of new group. */
cygsid group_sid (NO_SID);
cygsid group_sid;
/* Check for current user first */
if (gid == myself->gid)
group_sid = cygheap->user.groups.pgsid;
@ -1587,7 +1584,6 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
/* Initialize local security descriptor. */
SECURITY_DESCRIPTOR sd;
PSECURITY_DESCRIPTOR psd = NULL;
if (!InitializeSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION))
{
__seterrno ();
@ -1684,59 +1680,48 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
/* Add owner and group permissions if SIDs are equal
and construct deny attributes for group and owner. */
DWORD group_deny;
if (owner_sid == group_sid)
{
owner_allow |= group_allow;
group_allow = group_deny = 0L;
}
else
{
group_deny = ~group_allow & other_allow;
group_deny &= ~(STANDARD_RIGHTS_READ
| FILE_READ_ATTRIBUTES | FILE_READ_EA);
}
BOOL isownergroup;
if ((isownergroup = (owner_sid == group_sid)))
owner_allow |= group_allow;
DWORD owner_deny = ~owner_allow & (group_allow | other_allow);
owner_deny &= ~(STANDARD_RIGHTS_READ
| FILE_READ_ATTRIBUTES | FILE_READ_EA
| FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA);
/* Construct appropriate inherit attribute. */
DWORD inherit = (attribute & S_IFDIR) ? SUB_CONTAINERS_AND_OBJECTS_INHERIT
: NO_INHERITANCE;
DWORD group_deny = ~group_allow & other_allow;
group_deny &= ~(STANDARD_RIGHTS_READ
| FILE_READ_ATTRIBUTES | FILE_READ_EA);
/* Set deny ACE for owner. */
if (owner_deny
&& !add_access_denied_ace (acl, ace_off++, owner_deny,
owner_sid, acl_len, inherit))
owner_sid, acl_len, NO_INHERITANCE))
return NULL;
/* Set deny ACE for group here to respect the canonical order,
if this does not impact owner */
if (group_deny && !(owner_allow & group_deny))
{
if (!add_access_denied_ace (acl, ace_off++, group_deny,
group_sid, acl_len, inherit))
return NULL;
group_deny = 0;
}
if (group_deny && !(group_deny & owner_allow) && !isownergroup
&& !add_access_denied_ace (acl, ace_off++, group_deny,
group_sid, acl_len, NO_INHERITANCE))
return NULL;
/* Set allow ACE for owner. */
if (!add_access_allowed_ace (acl, ace_off++, owner_allow,
owner_sid, acl_len, inherit))
owner_sid, acl_len, NO_INHERITANCE))
return NULL;
/* Set deny ACE for group, if still needed. */
if (group_deny
if (group_deny & owner_allow && !isownergroup
&& !add_access_denied_ace (acl, ace_off++, group_deny,
group_sid, acl_len, inherit))
group_sid, acl_len, NO_INHERITANCE))
return NULL;
/* Set allow ACE for group. */
if (group_allow
if (!isownergroup
&& !add_access_allowed_ace (acl, ace_off++, group_allow,
group_sid, acl_len, inherit))
group_sid, acl_len, NO_INHERITANCE))
return NULL;
/* Set allow ACE for everyone. */
if (!add_access_allowed_ace (acl, ace_off++, other_allow,
well_known_world_sid, acl_len, inherit))
well_known_world_sid, acl_len, NO_INHERITANCE))
return NULL;
/* Set null ACE for special bits. */
if (null_allow
@ -1746,7 +1731,7 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
/* Fill ACL with unrelated ACEs from current security descriptor. */
PACL oacl;
BOOL acl_exists;
BOOL acl_exists = FALSE;
ACCESS_ALLOWED_ACE *ace;
if (GetSecurityDescriptorDacl (sd_ret, &acl_exists, &oacl, &dummy)
&& acl_exists && oacl)
@ -1755,19 +1740,26 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
{
cygsid ace_sid ((PSID) &ace->SidStart);
/* Check for related ACEs. */
if (ace_sid == well_known_null_sid)
continue;
if ((ace_sid == cur_owner_sid)
|| (ace_sid == owner_sid)
|| (ace_sid == cur_group_sid)
|| (ace_sid == group_sid)
|| (ace_sid == well_known_world_sid)
|| (ace_sid == well_known_null_sid))
continue;
|| (ace_sid == well_known_world_sid))
{
if (ace->Header.AceFlags & SUB_CONTAINERS_AND_OBJECTS_INHERIT)
ace->Header.AceFlags |= INHERIT_ONLY;
else
continue;
}
/*
* Add unrelated ACCESS_DENIED_ACE to the beginning but
* behind the owner_deny, ACCESS_ALLOWED_ACE to the end.
* FIXME: this would break the order of the inherit_only ACEs
*/
if (!AddAce (acl, ACL_REVISION,
ace->Header.AceType == ACCESS_DENIED_ACE_TYPE ?
ace->Header.AceType == ACCESS_DENIED_ACE_TYPE?
(owner_deny ? 1 : 0) : MAXDWORD,
(LPVOID) ace, ace->Header.AceSize))
{
@ -1777,6 +1769,46 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
acl_len += ace->Header.AceSize;
}
/* Construct appropriate inherit attribute for new directories */
if (attribute & S_IFDIR && !acl_exists )
{
const DWORD inherit = SUB_CONTAINERS_AND_OBJECTS_INHERIT | INHERIT_ONLY;
#if 0 /* FIXME: Not done currently as this breaks the canonical order */
/* Set deny ACE for owner. */
if (owner_deny
&& !add_access_denied_ace (acl, ace_off++, owner_deny,
well_known_creator_owner_sid, acl_len, inherit))
return NULL;
/* Set deny ACE for group here to respect the canonical order,
if this does not impact owner */
if (group_deny && !(group_deny & owner_allow)
&& !add_access_denied_ace (acl, ace_off++, group_deny,
well_known_creator_group_sid, acl_len, inherit))
return NULL;
#endif
/* Set allow ACE for owner. */
if (!add_access_allowed_ace (acl, ace_off++, owner_allow,
well_known_creator_owner_sid, acl_len, inherit))
return NULL;
#if 0 /* FIXME: Not done currently as this breaks the canonical order and
won't be preserved on chown and chmod */
/* Set deny ACE for group, conflicting with owner_allow. */
if (group_deny & owner_allow
&& !add_access_denied_ace (acl, ace_off++, group_deny,
well_known_creator_group_sid, acl_len, inherit))
return NULL;
#endif
/* Set allow ACE for group. */
if (!add_access_allowed_ace (acl, ace_off++, group_allow,
well_known_creator_group_sid, acl_len, inherit))
return NULL;
/* Set allow ACE for everyone. */
if (!add_access_allowed_ace (acl, ace_off++, other_allow,
well_known_world_sid, acl_len, inherit))
return NULL;
}
/* Set AclSize to computed value. */
acl->AclSize = acl_len;
debug_printf ("ACL-Size: %d", acl_len);
@ -1801,10 +1833,9 @@ alloc_sd (__uid32_t uid, __gid32_t gid, int attribute,
__seterrno ();
return NULL;
}
psd = sd_ret;
debug_printf ("Created SD-Size: %d", *sd_size_ret);
return psd;
return sd_ret;
}
void