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* security.cc (alloc_sd): Re-introduce setting the SE_DACL_PROTECTED

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flag.  Remove INHERITED_ACE flag from all inherited ACEs.  Add comment.
	Fix ace_off counter in unrelated ACE loop.
	* wincap.cc: Re-add has_dacl_protect throughout.
	* wincap.h: Ditto.
This commit is contained in:
Corinna Vinschen
2009-11-03 09:31:45 +00:00
parent 1bb3825949
commit 18f7c50401
4 changed files with 46 additions and 12 deletions
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35
winsup/cygwin/security.cc
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@@ -434,6 +434,11 @@ alloc_sd (path_conv &pc, __uid32_t uid, __gid32_t gid, int attribute,
return NULL;
}
/* We set the SE_DACL_PROTECTED flag here to prevent the DACL from being
* modified by inheritable ACEs. This flag is available since Win2K. */
if (wincap.has_dacl_protect ())
sd.Control |= SE_DACL_PROTECTED;
/* Create owner for local security descriptor. */
if (!SetSecurityDescriptorOwner (&sd, owner_sid, FALSE))
{
@@ -591,27 +596,36 @@ alloc_sd (path_conv &pc, __uid32_t uid, __gid32_t gid, int attribute,
else
continue;
}
else if ((attribute & S_JUSTCREATED)
&& !(ace->Header.AceFlags & INHERITED_ACE))
/* Since files and dirs are created with a NULL descriptor,
inheritence rules kick in. However, if no inheritable entries
exist in the parent object, Windows will create entries from the
user token's default DACL in the file DACL. These entries are
not desired and we drop them silently here. */
continue;
else if (attribute & S_JUSTCREATED)
{
/* Since files and dirs are created with a NULL descriptor,
inheritence rules kick in. If no inheritable entries exist
in the parent object, Windows will create entries from the
user token's default DACL in the file DACL. These entries
are not desired and we drop them silently. */
if (!(ace->Header.AceFlags & INHERITED_ACE))
continue;
/* Remove the INHERITED_ACE flag since on POSIX systems
inheritance is settled when the file has been created.
This also avoids error messages in Windows Explorer when
opening a file's security tab. Explorer complains if
inheritable ACEs are preceding non-inheritable ACEs. */
ace->Header.AceFlags &= ~INHERITED_ACE;
}
/*
* 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?
(owner_deny ? 1 : 0) : MAXDWORD,
ace->Header.AceType == ACCESS_DENIED_ACE_TYPE
? (owner_deny ? 1 : 0) : MAXDWORD,
(LPVOID) ace, ace->Header.AceSize))
{
__seterrno ();
return NULL;
}
ace_off++;
acl_len += ace->Header.AceSize;
}
@@ -620,7 +634,6 @@ alloc_sd (path_conv &pc, __uid32_t uid, __gid32_t gid, int attribute,
{
const DWORD inherit = CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE
| INHERIT_ONLY_ACE;
#if 0 /* FIXME: Not done currently as this breaks the canonical order */
/* Set deny ACE for owner. */
if (owner_deny