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* fhandler.cc (fhandler_base::open): Always create file with default 

security descriptor and fix descriptor afterwards.  Change comment to
	explain why.
	* security.cc (alloc_sd): Drop setting the SE_DACL_PROTECTED flag.
	* wincap.cc: Remove has_dacl_protect throughout.
	* wincap.h: Ditto.
This commit is contained in:
Corinna Vinschen 2009-10-24 08:26:01 +00:00
parent 4c038a6101
commit 1647bf67c1
5 changed files with 30 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,12 @@
2009-10-23 Corinna Vinschen <corinna@vinschen.de>
* fhandler.cc (fhandler_base::open): Always create file with default
security descriptor and fix descriptor afterwards. Change comment to
explain why.
* security.cc (alloc_sd): Drop setting the SE_DACL_PROTECTED flag.
* wincap.cc: Remove has_dacl_protect throughout.
* wincap.h: Ditto.
2009-10-23 Corinna Vinschen <corinna@vinschen.de>
* fhandler_random.cc (fhandler_dev_random::lseek): Allow negative

48
winsup/cygwin/fhandler.cc
View File

@ -553,20 +553,7 @@ fhandler_base::open (int flags, mode_t mode)
{
file_attributes |= FILE_ATTRIBUTE_NORMAL;
/* If mode has no write bits set, and ACLs are not used, we set
the DOS R/O attribute. */
if (!has_acls () && !(mode & (S_IWUSR | S_IWGRP | S_IWOTH)))
file_attributes |= FILE_ATTRIBUTE_READONLY;
/* If the file should actually be created and has ACLs,
set files attributes, except on remote file systems.
See below. */
if (has_acls () && !pc.isremote ())
{
set_security_attribute (pc, mode, &sa, sd);
attr.SecurityDescriptor = sa.lpSecurityDescriptor;
}
else if (pc.fs_is_nfs ())
if (pc.fs_is_nfs ())
{
/* When creating a file on an NFS share, we have to set the
file mode by writing a NFS fattr3 structure with the
@ -586,6 +573,10 @@ fhandler_base::open (int flags, mode_t mode)
nfs_attr->type = NF3REG;
nfs_attr->mode = mode;
}
else if (!has_acls () && !(mode & (S_IWUSR | S_IWGRP | S_IWOTH)))
/* If mode has no write bits set, and ACLs are not used, we set
the DOS R/O attribute. */
file_attributes |= FILE_ATTRIBUTE_READONLY;
/* The file attributes are needed for later use in, e.g. fchmod. */
pc.file_attributes (file_attributes);
}
@ -606,24 +597,27 @@ fhandler_base::open (int flags, mode_t mode)
goto done;
}
/* After some discussion on the samba-technical list, starting here:
http://lists.samba.org/archive/samba-technical/2008-July/060247.html
/* Always create files using a NULL SD. Create correct permission bits
afterwards, maintaining the owner and group information just like chmod.
Always create files on a remote share using a NULL SD. Create
correct permission bits afterwards, maintaing the owner and group
information just like chmod.
This is done for two reasons.
The reason to do this is to maintain the Windows behaviour when
creating files on a remote share. Files on a remote share are
created as the user used for authentication. In a domain that's
On Windows filesystems we need to create the file with default
permissions to allow inheriting ACEs. When providing an explicit DACL
in calls to [Nt]CreateFile, the created file will not inherit default
permissions from the parent object. This breaks not only Windows
inheritance, but also POSIX ACL inheritance.
Another reason to do this are remote shares. Files on a remote share
are created as the user used for authentication. In a domain that's
usually the user you're logged in as. Outside of a domain you're
authenticating using a local user account on the sharing machine.
If the SIDs of the client machine are used, that's entirely
unexpected behaviour.
Doing it like we do here creates the expected SD in a domain as
well as on standalone servers. */
if ((flags & O_CREAT) && has_acls () && pc.isremote ())
unexpected behaviour. Doing it like we do here creates the expected SD
in a domain as well as on standalone servers.
This is the result of a discussion on the samba-technical list, starting at
http://lists.samba.org/archive/samba-technical/2008-July/060247.html */
if ((flags & O_CREAT) && has_acls ())
set_file_attribute (fh, pc, ILLEGAL_UID, ILLEGAL_GID, mode);
set_io_handle (fh);

5
winsup/cygwin/security.cc
View File

@ -432,11 +432,6 @@ 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))
{

11
winsup/cygwin/wincap.cc
View File

@ -25,7 +25,6 @@ wincaps wincap_unknown __attribute__((section (".cygwin_dll_common"), shared)) =
heapslop:0x0,
max_sys_priv:SE_CHANGE_NOTIFY_PRIVILEGE,
is_server:false,
has_dacl_protect:false,
has_ip_helper_lib:false,
has_broken_if_oper_status:false,
has_physical_mem_access:true,
@ -64,7 +63,6 @@ wincaps wincap_nt4 __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x0,
max_sys_priv:SE_CHANGE_NOTIFY_PRIVILEGE,
is_server:false,
has_dacl_protect:false,
has_ip_helper_lib:false,
has_broken_if_oper_status:false,
has_physical_mem_access:true,
@ -103,7 +101,6 @@ wincaps wincap_nt4sp4 __attribute__((section (".cygwin_dll_common"), shared)) =
heapslop:0x0,
max_sys_priv:SE_CHANGE_NOTIFY_PRIVILEGE,
is_server:false,
has_dacl_protect:false,
has_ip_helper_lib:true,
has_broken_if_oper_status:true,
has_physical_mem_access:true,
@ -142,7 +139,6 @@ wincaps wincap_2000 __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x0,
max_sys_priv:SE_MANAGE_VOLUME_PRIVILEGE,
is_server:false,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:true,
@ -181,7 +177,6 @@ wincaps wincap_2000sp4 __attribute__((section (".cygwin_dll_common"), shared)) =
heapslop:0x0,
max_sys_priv:SE_CREATE_GLOBAL_PRIVILEGE,
is_server:false,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:true,
@ -220,7 +215,6 @@ wincaps wincap_xp __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x0,
max_sys_priv:SE_MANAGE_VOLUME_PRIVILEGE,
is_server:false,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:true,
@ -259,7 +253,6 @@ wincaps wincap_xpsp1 __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x0,
max_sys_priv:SE_MANAGE_VOLUME_PRIVILEGE,
is_server:false,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:true,
@ -298,7 +291,6 @@ wincaps wincap_xpsp2 __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x0,
max_sys_priv:SE_CREATE_GLOBAL_PRIVILEGE,
is_server:false,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:true,
@ -337,7 +329,6 @@ wincaps wincap_2003 __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x4,
max_sys_priv:SE_CREATE_GLOBAL_PRIVILEGE,
is_server:true,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:false,
@ -376,7 +367,6 @@ wincaps wincap_vista __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x4,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:false,
@ -415,7 +405,6 @@ wincaps wincap_7 __attribute__((section (".cygwin_dll_common"), shared)) = {
heapslop:0x4,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_dacl_protect:true,
has_ip_helper_lib:true,
has_broken_if_oper_status:false,
has_physical_mem_access:false,

2
winsup/cygwin/wincap.h
View File

@ -17,7 +17,6 @@ struct wincaps
DWORD heapslop;
DWORD max_sys_priv;
unsigned is_server : 1;
unsigned has_dacl_protect : 1;
unsigned has_ip_helper_lib : 1;
unsigned has_broken_if_oper_status : 1;
unsigned has_physical_mem_access : 1;
@ -72,7 +71,6 @@ public:
DWORD IMPLEMENT (heapslop)
DWORD IMPLEMENT (max_sys_priv)
bool IMPLEMENT (is_server)
bool IMPLEMENT (has_dacl_protect)
bool IMPLEMENT (has_ip_helper_lib)
bool IMPLEMENT (has_broken_if_oper_status)
bool IMPLEMENT (has_physical_mem_access)