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* cygheap.cc (cygheap_init): Accomodate set_process_privilege change. 

* cygheap.h (cygheap_user::curr_primary_token): New member.
	(cygheap_user::primary_token): New method.
	(cygheap_user::deimpersonate): Always revert to processes'
	impersonation token.
	(cygheap_user::reimpersonate): Set processes' or setuid token as
	necessary.
	(cygheap_user::has_impersonation_tokens): Look for curr_primary_token
	value.
	(cygheap_user::close_impersonation_tokens): Close curr_primary_token
	here if necessary.  Don't reset token values to NO_IMPERSONATION since
	that's done in uinfo_init anyway.
	(init_cygheap::luid): New LUID array keeping privilege LUIDs.
	* cygtls.cc (_cygtls::init_thread): Call cygheap->user.reimpersonate.
	* dcrt0.cc (hProcToken): New global variable to keep process token.
	(hProcImpToken): Ditto for process impersonation token.
	(dll_crt0_0): Open process token here once.  Duplicate to create
	hProcImpToken.
	(dll_crt0_1): Call set_cygwin_privileges.
	* environ.cc (allow_ntea): Drop duplicate declaration.
	(allow_smbntsec): Ditto.
	(set_traverse): Only set allow_traverse here.
	(environ_init): Ditto.
	* fhandler_disk_file.cc (fhandler_disk_file::fchmod): Drop call to
	enable_restore_privilege.
	(fhandler_disk_file::fchown): Ditto.
	(fhandler_disk_file::facl): Ditto.
	* fork.cc (fork_child): Move call to cygheap->user.reimpersonate after
	syn with parent. Call set_cygwin_privileges.
	* grp.cc (internal_getgroups): Use hProcImpToken instead of opening
	process token.
	* path.cc (fs_info::update): Bypass traverse checking when retrieving
	volume information using push/pop_thread_privileges.
	* registry.cc (load_registry_hive): Drop setting restore privilege
	since it's already set if available.
	* sec_helper.cc: Include cygtls.h.
	(cygpriv): Privilege string array.
	(privilege_luid): New function, evaluate LUID from cygpriv_idx.
	(privilege_luid_by_name): New function, evaluate LUID from privilege
	string.
	(privilege_name): New function, evaluate privilege string from
	cygpriv_idx.
	(set_privilege): New static function called by set_process_privilege
	and set_thread_privilege.  Call privilege_luid to get privilege LUID.
	Fix bug in return value evaluation. Improve debug output.
	(set_cygwin_privileges): New function.
	(set_process_privilege): Remove.
	(enable_restore_privilege): Remove.
	* security.cc (allow_traverse): New global variable.
	(sys_privs): Change type to cygpriv_idx and store privilege indices
	instead of strings.
	(SYSTEM_PRIVILEGES_COUNT): Renamed from SYSTEM_PERMISSION_COUNT.
	(get_system_priv_list): Don't use numerical constant in malloc call.
	Use privilege_luid to get privilege LUIDs.
	(get_priv_list): Call privilege_luid_by_name to get LUIDs. Improve
	inner privilege LUID comparison loop.
	(create_token): Enable create token privilege using
	push/pop_self_privileges. Use hProcToken instead of opening process
	token. Use default DACL when duplicating token.
	(subauth): Enable tcb privilege using push/pop_self_privileges.
	Use sec_none instead of homw made security attributes when duplicating
	token.
	(check_file_access): Don't duplicate access token, use active
	impersonation token as is.
	* security.h (enum cygpriv_idx): New enumeration type enumerating
	possible privileges.
	(privilege_luid): Declare new function.
	(privilege_luid_by_name): Ditto.
	(privilege_name): Ditto.
	(allow_traverse): Declare.
	(set_privilege): Declare function.
	(set_process_privilege): Define as macro.
	(enable_restore_privilege): Remove declaration.
	(_push_thread_privilege): Define macro.
	(push_thread_privilege): Ditto.
	(pop_thread_privilege): Ditto.
	(pop_self_privilege): Ditto.
	* spawn.cc (spawn_guts): Use cygheap->user.primary_token instead of
	cygheap->user.token.
	* syscalls.cc (statvfs): Bypass traverse checking when retrieving
	volume information using push/pop_thread_privileges. Rearrange code
	to simplify push/pop bracketing.
	(seteuid32): Use hProcToken instead of opening process token. Call
	cygheap->user.deimpersonate instead of RevertToSelf.  Create
	impersonation token from primary internal or external token.  Set
	cygheap->user.curr_primary_token and cygheap->user.current_token
	privileges once here.  Drop "failed" and "failed_ptok" labels.
	Drop setting DefaultDacl of process token.
	(setegid32): Use hProcToken and hProcImpToken instead of opening
	process token. Always reimpersonate afterwards.
	* uinfo.cc (cygheap_user::init): Use hProcToken instead of opening
	process token.
	(internal_getlogin): Ditto. Set hProcImpToken, too.
	(uinfo_init): Initialize cygheap->user.curr_primary_token.
	* winsup.h (hProcToken): Declare.
	(hProcImpToken): Declare.
This commit is contained in:
Corinna Vinschen 2005-04-03 13:06:43 +00:00
parent fe3e333661
commit f4a1f8a1db
18 changed files with 498 additions and 287 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

99
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,102 @@
2005-04-03 Corinna Vinschen <corinna@vinschen.de>
* cygheap.cc (cygheap_init): Accomodate set_process_privilege change.
* cygheap.h (cygheap_user::curr_primary_token): New member.
(cygheap_user::primary_token): New method.
(cygheap_user::deimpersonate): Always revert to processes'
impersonation token.
(cygheap_user::reimpersonate): Set processes' or setuid token as
necessary.
(cygheap_user::has_impersonation_tokens): Look for curr_primary_token
value.
(cygheap_user::close_impersonation_tokens): Close curr_primary_token
here if necessary. Don't reset token values to NO_IMPERSONATION since
that's done in uinfo_init anyway.
(init_cygheap::luid): New LUID array keeping privilege LUIDs.
* cygtls.cc (_cygtls::init_thread): Call cygheap->user.reimpersonate.
* dcrt0.cc (hProcToken): New global variable to keep process token.
(hProcImpToken): Ditto for process impersonation token.
(dll_crt0_0): Open process token here once. Duplicate to create
hProcImpToken.
(dll_crt0_1): Call set_cygwin_privileges.
* environ.cc (allow_ntea): Drop duplicate declaration.
(allow_smbntsec): Ditto.
(set_traverse): Only set allow_traverse here.
(environ_init): Ditto.
* fhandler_disk_file.cc (fhandler_disk_file::fchmod): Drop call to
enable_restore_privilege.
(fhandler_disk_file::fchown): Ditto.
(fhandler_disk_file::facl): Ditto.
* fork.cc (fork_child): Move call to cygheap->user.reimpersonate after
syn with parent. Call set_cygwin_privileges.
* grp.cc (internal_getgroups): Use hProcImpToken instead of opening
process token.
* path.cc (fs_info::update): Bypass traverse checking when retrieving
volume information using push/pop_thread_privileges.
* registry.cc (load_registry_hive): Drop setting restore privilege
since it's already set if available.
* sec_helper.cc: Include cygtls.h.
(cygpriv): Privilege string array.
(privilege_luid): New function, evaluate LUID from cygpriv_idx.
(privilege_luid_by_name): New function, evaluate LUID from privilege
string.
(privilege_name): New function, evaluate privilege string from
cygpriv_idx.
(set_privilege): New static function called by set_process_privilege
and set_thread_privilege. Call privilege_luid to get privilege LUID.
Fix bug in return value evaluation. Improve debug output.
(set_cygwin_privileges): New function.
(set_process_privilege): Remove.
(enable_restore_privilege): Remove.
* security.cc (allow_traverse): New global variable.
(sys_privs): Change type to cygpriv_idx and store privilege indices
instead of strings.
(SYSTEM_PRIVILEGES_COUNT): Renamed from SYSTEM_PERMISSION_COUNT.
(get_system_priv_list): Don't use numerical constant in malloc call.
Use privilege_luid to get privilege LUIDs.
(get_priv_list): Call privilege_luid_by_name to get LUIDs. Improve
inner privilege LUID comparison loop.
(create_token): Enable create token privilege using
push/pop_self_privileges. Use hProcToken instead of opening process
token. Use default DACL when duplicating token.
(subauth): Enable tcb privilege using push/pop_self_privileges.
Use sec_none instead of homw made security attributes when duplicating
token.
(check_file_access): Don't duplicate access token, use active
impersonation token as is.
* security.h (enum cygpriv_idx): New enumeration type enumerating
possible privileges.
(privilege_luid): Declare new function.
(privilege_luid_by_name): Ditto.
(privilege_name): Ditto.
(allow_traverse): Declare.
(set_privilege): Declare function.
(set_process_privilege): Define as macro.
(enable_restore_privilege): Remove declaration.
(_push_thread_privilege): Define macro.
(push_thread_privilege): Ditto.
(pop_thread_privilege): Ditto.
(pop_self_privilege): Ditto.
* spawn.cc (spawn_guts): Use cygheap->user.primary_token instead of
cygheap->user.token.
* syscalls.cc (statvfs): Bypass traverse checking when retrieving
volume information using push/pop_thread_privileges. Rearrange code
to simplify push/pop bracketing.
(seteuid32): Use hProcToken instead of opening process token. Call
cygheap->user.deimpersonate instead of RevertToSelf. Create
impersonation token from primary internal or external token. Set
cygheap->user.curr_primary_token and cygheap->user.current_token
privileges once here. Drop "failed" and "failed_ptok" labels.
Drop setting DefaultDacl of process token.
(setegid32): Use hProcToken and hProcImpToken instead of opening
process token. Always reimpersonate afterwards.
* uinfo.cc (cygheap_user::init): Use hProcToken instead of opening
process token.
(internal_getlogin): Ditto. Set hProcImpToken, too.
(uinfo_init): Initialize cygheap->user.curr_primary_token.
* winsup.h (hProcToken): Declare.
(hProcImpToken): Declare.
2005-04-03 Corinna Vinschen <corinna@vinschen.de>
Unify usage of CYG_MAX_PATH throughout. Change buffers from

3
winsup/cygwin/cygheap.cc
View File

@ -268,7 +268,7 @@ cygheap_init ()
if (!cygheap->shared_prefix)
cygheap->shared_prefix = cstrdup (
wincap.has_terminal_services ()
&& (set_process_privilege (SE_CREATE_GLOBAL_NAME, true) >= 0
&& (set_process_privilege (SE_CREATE_GLOBAL_PRIV, true) >= 0
|| GetLastError () == ERROR_NO_SUCH_PRIVILEGE)
? "Global\\" : "");
}
@ -511,4 +511,3 @@ cygheap_user::set_name (const char *new_name)
cfree_and_set (pdomain);
cfree_and_set (pwinname);
}

36
winsup/cygwin/cygheap.h
View File

@ -123,6 +123,7 @@ public:
to `set_impersonation_token()'. */
HANDLE external_token;
HANDLE internal_token;
HANDLE curr_primary_token;
HANDLE current_token;
/* CGF 2002-06-27. I removed the initializaton from this constructor
@ -172,40 +173,36 @@ public:
const char *ontherange (homebodies what, struct passwd * = NULL);
#define NO_IMPERSONATION NULL
bool issetuid () const { return current_token != NO_IMPERSONATION; }
HANDLE primary_token () { return curr_primary_token; }
HANDLE token () { return current_token; }
void deimpersonate ()
{
if (issetuid ())
RevertToSelf ();
{
RevertToSelf ();
ImpersonateLoggedOnUser (hProcImpToken);
}
}
void reimpersonate ()
bool reimpersonate ()
{
if (issetuid ()
&& !ImpersonateLoggedOnUser (token ()))
system_printf ("ImpersonateLoggedOnUser: %E");
return ImpersonateLoggedOnUser (issetuid () ? token () : hProcImpToken);
}
bool has_impersonation_tokens ()
{ return external_token != NO_IMPERSONATION
|| internal_token != NO_IMPERSONATION
|| current_token != NO_IMPERSONATION; }
|| curr_primary_token != NO_IMPERSONATION; }
void close_impersonation_tokens ()
{
if (current_token != NO_IMPERSONATION)
{
if( current_token != external_token && current_token != internal_token)
CloseHandle (current_token);
current_token = NO_IMPERSONATION;
}
CloseHandle (current_token);
if (curr_primary_token != NO_IMPERSONATION
&& curr_primary_token != external_token
&& curr_primary_token != internal_token)
CloseHandle (curr_primary_token);
if (external_token != NO_IMPERSONATION)
{
CloseHandle (external_token);
external_token = NO_IMPERSONATION;
}
CloseHandle (external_token);
if (internal_token != NO_IMPERSONATION)
{
CloseHandle (internal_token);
internal_token = NO_IMPERSONATION;
}
CloseHandle (internal_token);
}
char * get_windows_id (char * buf)
{
@ -284,6 +281,7 @@ struct init_cygheap
char *cygwin_regname;
cwdstuff cwd;
dtable fdtab;
LUID luid[SE_NUM_PRIVS];
const char *shared_prefix;
#ifdef DEBUGGING
cygheap_debug debug;

3
winsup/cygwin/cygtls.cc
View File

@ -124,6 +124,9 @@ _cygtls::init_thread (void *x, DWORD (*func) (void *, void *))
|| (void *) func == (void *) cygthread::simplestub)
return;
if (wincap.has_security ())
cygheap->user.reimpersonate ();
sentry here (INFINITE);
if (nthreads >= cygheap->sthreads)
{

13
winsup/cygwin/dcrt0.cc
View File

@ -45,6 +45,8 @@ void ld_preload ();
HANDLE NO_COPY hMainProc = (HANDLE) -1;
HANDLE NO_COPY hMainThread;
HANDLE NO_COPY hProcToken;
HANDLE NO_COPY hProcImpToken;
bool display_title;
bool strip_title_path;
@ -589,6 +591,8 @@ dll_crt0_0 ()
DuplicateHandle (hMainProc, GetCurrentThread (), hMainProc,
&hMainThread, 0, false, DUPLICATE_SAME_ACCESS);
if (wincap.has_security ())
OpenProcessToken (hMainProc, MAXIMUM_ALLOWED, &hProcToken);
(void) SetErrorMode (SEM_FAILCRITICALERRORS);
@ -688,6 +692,12 @@ dll_crt0_0 ()
events_init ();
cygheap->cwd.init ();
/* Late duplicate simplifies tweaking the process token in uinfo.cc. */
if (wincap.has_security ())
DuplicateTokenEx (hProcToken, MAXIMUM_ALLOWED, NULL,
SecurityImpersonation, TokenImpersonation,
&hProcImpToken);
}
/* Take over from libc's crt0.o and start the application. Note the
@ -759,6 +769,9 @@ dll_crt0_1 (char *)
/* Initialize our process table entry. */
pinfo_init (envp, envc);
/* Can be set only after environment has been initialized. */
set_cygwin_privileges (hProcImpToken);
if (!old_title && GetConsoleTitle (title_buf, TITLESIZE))
old_title = title_buf;

9
winsup/cygwin/environ.cc
View File

@ -22,14 +22,13 @@ details. */
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "cygtls.h"
#include "registry.h"
#include "environ.h"
#include "child_info.h"
extern bool allow_glob;
extern bool ignore_case_with_glob;
extern bool allow_ntea;
extern bool allow_smbntsec;
extern bool allow_winsymlinks;
extern bool strip_title_path;
extern int pcheck_case;
@ -533,9 +532,7 @@ set_ntsec (const char *buf)
static void
set_traverse (const char *buf)
{
if (wincap.has_security ())
set_process_privilege (SE_CHANGE_NOTIFY_NAME,
!buf || !strcasematch (buf, "yes"));
allow_traverse = (buf && strcasematch (buf, "yes") && wincap.has_security ());
}
static void
@ -738,7 +735,7 @@ environ_init (char **envp, int envc)
if (wincap.has_security ())
{
allow_ntsec = true;
set_process_privilege (SE_CHANGE_NOTIFY_NAME, false);
allow_traverse = true;
}
if (!envp)

4
winsup/cygwin/fhandler_disk_file.cc
View File

@ -409,7 +409,6 @@ fhandler_disk_file::fchmod (mode_t mode)
if (wincap.has_security ())
{
enable_restore_privilege ();
if (!get_io_handle () && pc.has_acls ())
{
query_open (query_write_control);
@ -461,7 +460,6 @@ fhandler_disk_file::fchown (__uid32_t uid, __gid32_t gid)
return 0;
}
enable_restore_privilege ();
if (!get_io_handle ())
{
query_open (query_write_control);
@ -548,8 +546,6 @@ fhandler_disk_file::facl (int cmd, int nentries, __aclent32_t *aclbufp)
}
else
{
if (cmd == SETACL)
enable_restore_privilege ();
if (!get_io_handle ())
{
query_open (cmd == SETACL ? query_write_control : query_read_control);

10
winsup/cygwin/fork.cc
View File

@ -160,10 +160,6 @@ fork_child (HANDLE& hParent, dll *&first_dll, bool& load_dlls)
debug_printf ("child is running. pid %d, ppid %d, stack here %p",
myself->pid, myself->ppid, __builtin_frame_address (0));
/* Restore the inheritance state as in parent
Don't call setuid here! The flags are already set. */
cygheap->user.reimpersonate ();
sync_with_parent ("after longjmp", true);
sigproc_printf ("hParent %p, child 1 first_dll %p, load_dlls %d", hParent,
first_dll, load_dlls);
@ -179,6 +175,12 @@ fork_child (HANDLE& hParent, dll *&first_dll, bool& load_dlls)
_impure_ptr = &_main_tls->local_clib;
}
if (wincap.has_security ())
{
set_cygwin_privileges (hProcImpToken);
cygheap->user.reimpersonate ();
}
#ifdef DEBUGGING
char c;
if (GetEnvironmentVariable ("FORKDEBUG", &c, 1))

12
winsup/cygwin/grp.cc
View File

@ -347,8 +347,8 @@ internal_getgroups (int gidsetsize, __gid32_t *grouplist, cygpsid * srchsid)
/* If impersonated, use impersonation token. */
if (cygheap->user.issetuid ())
hToken = cygheap->user.token ();
else if (!OpenProcessToken (hMainProc, TOKEN_QUERY, &hToken))
hToken = NULL;
else
hToken = hProcImpToken;
}
if (hToken)
{
@ -379,19 +379,13 @@ internal_getgroups (int gidsetsize, __gid32_t *grouplist, cygpsid * srchsid)
grouplist[cnt] = gr->gr_gid;
++cnt;
if (gidsetsize && cnt > gidsetsize)
{
if (!cygheap->user.issetuid ())
CloseHandle (hToken);
goto error;
}
goto error;
break;
}
}
}
else
debug_printf ("%d = GetTokenInformation(NULL) %E", size);
if (!cygheap->user.issetuid ())
CloseHandle (hToken);
return cnt;
}

15
winsup/cygwin/path.cc
View File

@ -348,6 +348,7 @@ fs_info::update (const char *win32_path)
{
char fsname [CYG_MAX_PATH];
char root_dir [CYG_MAX_PATH];
bool ret;
if (!rootdir (win32_path, root_dir))
{
@ -372,6 +373,10 @@ fs_info::update (const char *win32_path)
}
name_hash = tmp_name_hash;
/* I have no idea why, but some machines require SeChangeNotifyPrivilege
to access volume information. */
push_thread_privilege (SE_CHANGE_NOTIFY_PRIV, true);
drive_type (GetDriveType (root_dir));
if (drive_type () == DRIVE_REMOTE
|| (drive_type () == DRIVE_UNKNOWN
@ -380,9 +385,12 @@ fs_info::update (const char *win32_path)
else
is_remote_drive (false);
if (!GetVolumeInformation (root_dir, NULL, 0, &status.serial, NULL,
&status.flags, fsname, sizeof (fsname))
&& !is_remote_drive ())
ret = GetVolumeInformation (root_dir, NULL, 0, &status.serial, NULL,
&status.flags, fsname, sizeof (fsname));
pop_thread_privilege ();
if (!ret && !is_remote_drive ())
{
debug_printf ("Cannot get volume information (%s), %E", root_dir);
has_buggy_open (false);
@ -390,6 +398,7 @@ fs_info::update (const char *win32_path)
flags () = serial () = 0;
return false;
}
/* FIXME: Samba by default returns "NTFS" in file system name, but
* doesn't support Extended Attributes. If there's some fast way to
* distinguish between samba and real ntfs, it should be implemented

2
winsup/cygwin/registry.cc
View File

@ -251,8 +251,6 @@ load_registry_hive (const char * name)
RegCloseKey (hkey);
return;
}
/* This is only called while deimpersonated */
set_process_privilege (SE_RESTORE_NAME);
if (get_registry_hive_path (name, path))
{
if (wincap.is_winnt ())

118
winsup/cygwin/sec_helper.cc
View File

@ -30,6 +30,7 @@ details. */
#include "dtable.h"
#include "pinfo.h"
#include "cygheap.h"
#include "cygtls.h"
#include "pwdgrp.h"
/* General purpose security attribute objects for global use. */
@ -321,37 +322,95 @@ got_it:
#undef DOMLEN
#endif //unused
int
set_process_privilege (const char *privilege, bool enable, bool use_thread)
/* Order must be same as cygperm_idx in winsup.h. */
static const char *cygpriv[] =
{
HANDLE hToken = NULL;
LUID priv_luid;
TOKEN_PRIVILEGES new_priv, orig_priv;
int ret = -1;
DWORD size;
SE_CREATE_TOKEN_NAME,
SE_ASSIGNPRIMARYTOKEN_NAME,
SE_LOCK_MEMORY_NAME,
SE_INCREASE_QUOTA_NAME,
SE_UNSOLICITED_INPUT_NAME,
SE_MACHINE_ACCOUNT_NAME,
SE_TCB_NAME,
SE_SECURITY_NAME,
SE_TAKE_OWNERSHIP_NAME,
SE_LOAD_DRIVER_NAME,
SE_SYSTEM_PROFILE_NAME,
SE_SYSTEMTIME_NAME,
SE_PROF_SINGLE_PROCESS_NAME,
SE_INC_BASE_PRIORITY_NAME,
SE_CREATE_PAGEFILE_NAME,
SE_CREATE_PERMANENT_NAME,
SE_BACKUP_NAME,
SE_RESTORE_NAME,
SE_SHUTDOWN_NAME,
SE_DEBUG_NAME,
SE_AUDIT_NAME,
SE_SYSTEM_ENVIRONMENT_NAME,
SE_CHANGE_NOTIFY_NAME,
SE_REMOTE_SHUTDOWN_NAME,
SE_CREATE_GLOBAL_NAME,
SE_UNDOCK_NAME,
SE_MANAGE_VOLUME_NAME,
SE_IMPERSONATE_NAME,
SE_ENABLE_DELEGATION_NAME,
SE_SYNC_AGENT_NAME
};
if (!LookupPrivilegeValue (NULL, privilege, &priv_luid))
const LUID *
privilege_luid (cygpriv_idx idx)
{
if (idx < 0 || idx >= SE_NUM_PRIVS)
return NULL;
if (!cygheap->luid[idx].LowPart && !cygheap->luid[idx].HighPart
&& !LookupPrivilegeValue (NULL, cygpriv[idx], &cygheap->luid[idx]))
{
__seterrno ();
goto out;
return NULL;
}
return &cygheap->luid[idx];
}
if ((use_thread
&& !OpenThreadToken (GetCurrentThread (), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
0, &hToken))
||(!use_thread
&& !OpenProcessToken (hMainProc, TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
&hToken)))
const LUID *
privilege_luid_by_name (const char *pname)
{
int idx;
if (!pname)
return NULL;
for (idx = 0; idx < SE_NUM_PRIVS; ++idx)
if (!strcmp (pname, cygpriv[idx]))
return privilege_luid ((cygpriv_idx) idx);
return NULL;
}
const char *
privilege_name (cygpriv_idx idx)
{
if (idx < 0 || idx >= SE_NUM_PRIVS)
return "<unknown privilege>";
return cygpriv[idx];
}
int
set_privilege (HANDLE token, cygpriv_idx privilege, bool enable)
{
int ret = -1;
const LUID *priv_luid;
TOKEN_PRIVILEGES new_priv, orig_priv;
DWORD size;
if (!(priv_luid = privilege_luid (privilege)))
{
__seterrno ();
goto out;
}
new_priv.PrivilegeCount = 1;
new_priv.Privileges[0].Luid = priv_luid;
new_priv.Privileges[0].Luid = *priv_luid;
new_priv.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;
if (!AdjustTokenPrivileges (hToken, FALSE, &new_priv,
if (!AdjustTokenPrivileges (token, FALSE, &new_priv,
sizeof orig_priv, &orig_priv, &size))
{
__seterrno ();
@ -365,28 +424,23 @@ set_process_privilege (const char *privilege, bool enable, bool use_thread)
goto out;
}
ret = orig_priv.Privileges[0].Attributes == SE_PRIVILEGE_ENABLED ? 1 : 0;
/* If orig_priv.PrivilegeCount is 0, the privilege hasn't been changed. */
if (!orig_priv.PrivilegeCount)
ret = enable ? 1 : 0;
else
ret = (orig_priv.Privileges[0].Attributes & SE_PRIVILEGE_ENABLED) ? 1 : 0;
out:
if (hToken)
CloseHandle (hToken);
syscall_printf ("%d = set_process_privilege (%s, %d)", ret, privilege, enable);
syscall_printf ("%d = set_privilege ((token %x) %s, %d)",
ret, token, privilege_name (privilege), enable);
return ret;
}
/* Helper function to set the SE_RESTORE_NAME privilege once. */
void
enable_restore_privilege ()
set_cygwin_privileges (HANDLE token)
{
static int NO_COPY saved_res;
bool issetuid = cygheap->user.issetuid ();
if (!saved_res || issetuid)
{
int res = 2 + set_process_privilege (SE_RESTORE_NAME, true, issetuid);
if (!issetuid)
saved_res = res;
}
set_privilege (token, SE_RESTORE_PRIV, true);
set_privilege (token, SE_CHANGE_NOTIFY_PRIV, !allow_traverse);
}
/*

147
winsup/cygwin/security.cc
View File

@ -45,6 +45,7 @@ bool allow_ntsec;
It's defined here because of it's strong relationship to allow_ntsec.
The default is TRUE to reflect the old behaviour. */
bool allow_smbntsec;
bool allow_traverse;
cygsid *
cygsidlist::alloc_sids (int n)
@ -593,36 +594,44 @@ get_setgroups_sidlist (cygsidlist &tmp_list, PTOKEN_GROUPS my_grps,
tmp_list += pgpsid;
}
static const char *sys_privs[] = {
SE_TCB_NAME,
SE_ASSIGNPRIMARYTOKEN_NAME,
SE_CREATE_TOKEN_NAME,
SE_CHANGE_NOTIFY_NAME,
SE_SECURITY_NAME,
SE_BACKUP_NAME,
SE_RESTORE_NAME,
SE_SYSTEMTIME_NAME,
SE_SHUTDOWN_NAME,
SE_REMOTE_SHUTDOWN_NAME,
SE_TAKE_OWNERSHIP_NAME,
SE_DEBUG_NAME,
SE_SYSTEM_ENVIRONMENT_NAME,
SE_SYSTEM_PROFILE_NAME,
SE_PROF_SINGLE_PROCESS_NAME,
SE_INC_BASE_PRIORITY_NAME,
SE_LOAD_DRIVER_NAME,
SE_CREATE_PAGEFILE_NAME,
SE_INCREASE_QUOTA_NAME
static const cygpriv_idx sys_privs[] = {
SE_TCB_PRIV,
SE_ASSIGNPRIMARYTOKEN_PRIV,
SE_CREATE_TOKEN_PRIV,
SE_CHANGE_NOTIFY_PRIV,
SE_SECURITY_PRIV,
SE_BACKUP_PRIV,
SE_RESTORE_PRIV,
SE_SYSTEMTIME_PRIV,
SE_SHUTDOWN_PRIV,
SE_REMOTE_SHUTDOWN_PRIV,
SE_TAKE_OWNERSHIP_PRIV,
SE_DEBUG_PRIV,
SE_SYSTEM_ENVIRONMENT_PRIV,
SE_SYSTEM_PROFILE_PRIV,
SE_PROF_SINGLE_PROCESS_PRIV,
SE_INC_BASE_PRIORITY_PRIV,
SE_LOAD_DRIVER_PRIV,
SE_CREATE_PAGEFILE_PRIV,
SE_INCREASE_QUOTA_PRIV,
SE_LOCK_MEMORY_PRIV,
SE_CREATE_PERMANENT_PRIV,
SE_AUDIT_PRIV,
SE_UNDOCK_PRIV,
SE_MANAGE_VOLUME_PRIV,
SE_IMPERSONATE_PRIV,
SE_CREATE_GLOBAL_PRIV
};
#define SYSTEM_PERMISSION_COUNT (sizeof sys_privs / sizeof (const char *))
#define SYSTEM_PRIVILEGES_COUNT (sizeof sys_privs / sizeof *sys_privs)
PTOKEN_PRIVILEGES
get_system_priv_list (cygsidlist &grp_list)
{
LUID priv;
const LUID *priv;
PTOKEN_PRIVILEGES privs = (PTOKEN_PRIVILEGES)
malloc (sizeof (ULONG) + 20 * sizeof (LUID_AND_ATTRIBUTES));
malloc (sizeof (ULONG)
+ SYSTEM_PRIVILEGES_COUNT * sizeof (LUID_AND_ATTRIBUTES));
if (!privs)
{
debug_printf ("malloc (system_privs) failed.");
@ -630,10 +639,10 @@ get_system_priv_list (cygsidlist &grp_list)
}
privs->PrivilegeCount = 0;
for (DWORD i = 0; i < SYSTEM_PERMISSION_COUNT; ++i)
if (LookupPrivilegeValue (NULL, sys_privs[i], &priv))
for (DWORD i = 0; i < SYSTEM_PRIVILEGES_COUNT; ++i)
if ((priv = privilege_luid (sys_privs[i])))
{
privs->Privileges[privs->PrivilegeCount].Luid = priv;
privs->Privileges[privs->PrivilegeCount].Luid = *priv;
privs->Privileges[privs->PrivilegeCount].Attributes =
SE_PRIVILEGE_ENABLED | SE_PRIVILEGE_ENABLED_BY_DEFAULT;
++privs->PrivilegeCount;
@ -667,17 +676,23 @@ get_priv_list (LSA_HANDLE lsa, cygsid &usersid, cygsidlist &grp_list)
continue;
for (ULONG i = 0; i < cnt; ++i)
{
LUID priv;
const LUID *priv;
PTOKEN_PRIVILEGES tmp;
DWORD tmp_count;
lsa2str (buf, privstrs[i], sizeof (buf) - 1);
if (!LookupPrivilegeValue (NULL, buf, &priv))
if (!(priv = privilege_luid_by_name (buf)))
continue;
for (DWORD p = 0; privs && p < privs->PrivilegeCount; ++p)
if (!memcmp (&priv, &privs->Privileges[p].Luid, sizeof (LUID)))
goto next_account_right;
if (privs)
{
DWORD pcnt = privs->PrivilegeCount;
LUID_AND_ATTRIBUTES *p = privs->Privileges;
for (; pcnt > 0; --pcnt, ++p)
if (priv->HighPart == p->Luid.HighPart
&& priv->LowPart == p->Luid.LowPart)
goto next_account_right;
}
tmp_count = privs ? privs->PrivilegeCount : 0;
tmp = (PTOKEN_PRIVILEGES)
@ -693,7 +708,7 @@ get_priv_list (LSA_HANDLE lsa, cygsid &usersid, cygsidlist &grp_list)
}
tmp->PrivilegeCount = tmp_count;
privs = tmp;
privs->Privileges[privs->PrivilegeCount].Luid = priv;
privs->Privileges[privs->PrivilegeCount].Luid = *priv;
privs->Privileges[privs->PrivilegeCount].Attributes =
SE_PRIVILEGE_ENABLED | SE_PRIVILEGE_ENABLED_BY_DEFAULT;
++privs->PrivilegeCount;
@ -812,16 +827,13 @@ create_token (cygsid &usersid, user_groups &new_groups, struct passwd *pw)
{
NTSTATUS ret;
LSA_HANDLE lsa = INVALID_HANDLE_VALUE;
int old_priv_state;
cygsidlist tmp_gsids (cygsidlist_auto, 12);
SECURITY_QUALITY_OF_SERVICE sqos =
{ sizeof sqos, SecurityImpersonation, SECURITY_STATIC_TRACKING, FALSE };
OBJECT_ATTRIBUTES oa = { sizeof oa, 0, 0, 0, 0, &sqos };
PSECURITY_ATTRIBUTES psa;
bool special_pgrp = false;
char sa_buf[1024];
LUID auth_luid = SYSTEM_LUID;
LARGE_INTEGER exp = { QuadPart:INT64_MAX };
@ -840,13 +852,11 @@ create_token (cygsid &usersid, user_groups &new_groups, struct passwd *pw)
HANDLE token = INVALID_HANDLE_VALUE;
HANDLE primary_token = INVALID_HANDLE_VALUE;
HANDLE my_token = INVALID_HANDLE_VALUE;
PTOKEN_GROUPS my_tok_gsids = NULL;
DWORD size;
/* SE_CREATE_TOKEN_NAME privilege needed to call NtCreateToken. */
if ((old_priv_state = set_process_privilege (SE_CREATE_TOKEN_NAME)) < 0)
goto out;
push_self_privilege (SE_CREATE_TOKEN_PRIV, true);
/* Open policy object. */
if ((lsa = open_local_policy ()) == INVALID_HANDLE_VALUE)
@ -858,35 +868,32 @@ create_token (cygsid &usersid, user_groups &new_groups, struct passwd *pw)
owner.Owner = usersid;
/* Retrieve authentication id and group list from own process. */
if (!OpenProcessToken (hMainProc, TOKEN_QUERY, &my_token))
debug_printf ("OpenProcessToken(my_token), %E");
else
if (hProcToken)
{
/* Switching user context to SYSTEM doesn't inherit the authentication
id of the user account running current process. */
if (usersid != well_known_system_sid)
if (!GetTokenInformation (my_token, TokenStatistics,
if (!GetTokenInformation (hProcToken, TokenStatistics,
&stats, sizeof stats, &size))
debug_printf
("GetTokenInformation(my_token, TokenStatistics), %E");
("GetTokenInformation(hProcToken, TokenStatistics), %E");
else
auth_luid = stats.AuthenticationId;
/* Retrieving current processes group list to be able to inherit
some important well known group sids. */
if (!GetTokenInformation (my_token, TokenGroups, NULL, 0, &size) &&
if (!GetTokenInformation (hProcToken, TokenGroups, NULL, 0, &size) &&
GetLastError () != ERROR_INSUFFICIENT_BUFFER)
debug_printf ("GetTokenInformation(my_token, TokenGroups), %E");
debug_printf ("GetTokenInformation(hProcToken, TokenGroups), %E");
else if (!(my_tok_gsids = (PTOKEN_GROUPS) malloc (size)))
debug_printf ("malloc (my_tok_gsids) failed.");
else if (!GetTokenInformation (my_token, TokenGroups, my_tok_gsids,
else if (!GetTokenInformation (hProcToken, TokenGroups, my_tok_gsids,
size, &size))
{
debug_printf ("GetTokenInformation(my_token, TokenGroups), %E");
debug_printf ("GetTokenInformation(hProcToken, TokenGroups), %E");
free (my_tok_gsids);
my_tok_gsids = NULL;
}
CloseHandle (my_token);
}
/* Create list of groups, the user is member in. */
@ -932,18 +939,10 @@ create_token (cygsid &usersid, user_groups &new_groups, struct passwd *pw)
}
else
{
/* Set security descriptor and primary group */
psa = sec_user (sa_buf, usersid);
if (psa->lpSecurityDescriptor &&
!SetSecurityDescriptorGroup ((PSECURITY_DESCRIPTOR)
psa->lpSecurityDescriptor,
special_pgrp ? new_groups.pgsid
: well_known_null_sid,
FALSE))
debug_printf ("SetSecurityDescriptorGroup %E");
/* Convert to primary token. */
if (!DuplicateTokenEx (token, MAXIMUM_ALLOWED, psa, SecurityImpersonation,
TokenPrimary, &primary_token))
if (!DuplicateTokenEx (token, MAXIMUM_ALLOWED, &sec_none,
SecurityImpersonation, TokenPrimary,
&primary_token))
{
__seterrno ();
debug_printf ("DuplicateTokenEx %E");
@ -951,8 +950,7 @@ create_token (cygsid &usersid, user_groups &new_groups, struct passwd *pw)
}
out:
if (old_priv_state >= 0)
set_process_privilege (SE_CREATE_TOKEN_NAME, old_priv_state);
pop_self_privilege ();
if (token != INVALID_HANDLE_VALUE)
CloseHandle (token);
if (privs)
@ -993,13 +991,10 @@ subauth (struct passwd *pw)
QUOTA_LIMITS quota;
char nt_domain[INTERNET_MAX_HOST_NAME_LENGTH + 1];
char nt_user[UNLEN + 1];
SECURITY_ATTRIBUTES sa = { sizeof sa, NULL, TRUE };
HANDLE user_token = INVALID_HANDLE_VALUE;
HANDLE primary_token = INVALID_HANDLE_VALUE;
int old_tcb_state;
if ((old_tcb_state = set_process_privilege (SE_TCB_NAME)) < 0)
return INVALID_HANDLE_VALUE;
push_self_privilege (SE_TCB_PRIV, true);
/* Register as logon process. */
str2lsa (name, "Cygwin");
@ -1057,12 +1052,12 @@ subauth (struct passwd *pw)
}
LsaFreeReturnBuffer (profile);
/* Convert to primary token. */
if (!DuplicateTokenEx (user_token, TOKEN_ALL_ACCESS, &sa,
if (!DuplicateTokenEx (user_token, TOKEN_ALL_ACCESS, &sec_none,
SecurityImpersonation, TokenPrimary, &primary_token))
__seterrno ();
out:
set_process_privilege (SE_TCB_NAME, old_tcb_state);
pop_self_privilege ();
if (user_token != INVALID_HANDLE_VALUE)
CloseHandle (user_token);
return primary_token;
@ -1832,7 +1827,7 @@ check_file_access (const char *fn, int flags)
security_descriptor sd;
HANDLE hToken, hIToken;
HANDLE hToken;
BOOL status;
char pbuf[sizeof (PRIVILEGE_SET) + 3 * sizeof (LUID_AND_ATTRIBUTES)];
DWORD desired = 0, granted, plength = sizeof pbuf;
@ -1845,17 +1840,8 @@ check_file_access (const char *fn, int flags)
if (cygheap->user.issetuid ())
hToken = cygheap->user.token ();
else if (!OpenProcessToken (hMainProc, TOKEN_DUPLICATE, &hToken))
{
__seterrno ();
goto done;
}
if (!(status = DuplicateToken (hToken, SecurityIdentification, &hIToken)))
__seterrno ();
if (!cygheap->user.issetuid ())
CloseHandle (hToken);
if (!status)
goto done;
else
hToken = hProcImpToken;
if (flags & R_OK)
desired |= FILE_READ_DATA;
@ -1863,14 +1849,13 @@ check_file_access (const char *fn, int flags)
desired |= FILE_WRITE_DATA;
if (flags & X_OK)
desired |= FILE_EXECUTE;
if (!AccessCheck (sd, hIToken, desired, &mapping,
if (!AccessCheck (sd, hToken, desired, &mapping,
(PPRIVILEGE_SET) pbuf, &plength, &granted, &status))
__seterrno ();
else if (!status)
set_errno (EACCES);
else
ret = 0;
CloseHandle (hIToken);
done:
debug_printf ("flags %x, ret %d", flags, ret);
return ret;

74
winsup/cygwin/security.h
View File

@ -236,6 +236,46 @@ extern cygpsid well_known_authenticated_users_sid;
extern cygpsid well_known_system_sid;
extern cygpsid well_known_admins_sid;
/* Order must be same as cygpriv in sec_helper.cc. */
enum cygpriv_idx {
SE_CREATE_TOKEN_PRIV = 0,
SE_ASSIGNPRIMARYTOKEN_PRIV,
SE_LOCK_MEMORY_PRIV,
SE_INCREASE_QUOTA_PRIV,
SE_UNSOLICITED_INPUT_PRIV,
SE_MACHINE_ACCOUNT_PRIV,
SE_TCB_PRIV,
SE_SECURITY_PRIV,
SE_TAKE_OWNERSHIP_PRIV,
SE_LOAD_DRIVER_PRIV,
SE_SYSTEM_PROFILE_PRIV,
SE_SYSTEMTIME_PRIV,
SE_PROF_SINGLE_PROCESS_PRIV,
SE_INC_BASE_PRIORITY_PRIV,
SE_CREATE_PAGEFILE_PRIV,
SE_CREATE_PERMANENT_PRIV,
SE_BACKUP_PRIV,
SE_RESTORE_PRIV,
SE_SHUTDOWN_PRIV,
SE_DEBUG_PRIV,
SE_AUDIT_PRIV,
SE_SYSTEM_ENVIRONMENT_PRIV,
SE_CHANGE_NOTIFY_PRIV,
SE_REMOTE_SHUTDOWN_PRIV,
SE_CREATE_GLOBAL_PRIV,
SE_UNDOCK_PRIV,
SE_MANAGE_VOLUME_PRIV,
SE_IMPERSONATE_PRIV,
SE_ENABLE_DELEGATION_PRIV,
SE_SYNC_AGENT_PRIV,
SE_NUM_PRIVS
};
const LUID *privilege_luid (enum cygpriv_idx idx);
const LUID *privilege_luid_by_name (const char *pname);
const char *privilege_name (enum cygpriv_idx idx);
inline BOOL
legal_sid_type (SID_NAME_USE type)
{
@ -246,6 +286,7 @@ legal_sid_type (SID_NAME_USE type)
extern bool allow_ntea;
extern bool allow_ntsec;
extern bool allow_smbntsec;
extern bool allow_traverse;
/* File manipulation */
int __stdcall get_file_attribute (int, HANDLE, const char *, mode_t *,
@ -291,8 +332,37 @@ void extract_nt_dom_user (const struct passwd *pw, char *domain, char *user);
bool get_logon_server (const char * domain, char * server, WCHAR *wserver = NULL);
/* sec_helper.cc: Security helper functions. */
int set_process_privilege (const char *privilege, bool enable = true, bool use_thread = false);
void enable_restore_privilege (void);
int set_privilege (HANDLE token, enum cygpriv_idx privilege, bool enable);
void set_cygwin_privileges (HANDLE token);
#define set_process_privilege(p,v) set_privilege (hProcImpToken, (p), (v))
#define _push_thread_privilege(_priv, _val, _check) { \
HANDLE _token = NULL, _dup_token = NULL; \
if (wincap.has_security ()) \
{ \
_token = (cygheap->user.issetuid () && (_check)) \
? cygheap->user.token () : hProcImpToken; \
if (!DuplicateTokenEx (_token, MAXIMUM_ALLOWED, NULL, \
SecurityImpersonation, TokenImpersonation, \
&_dup_token)) \
debug_printf ("DuplicateTokenEx: %E"); \
else if (!ImpersonateLoggedOnUser (_dup_token)) \
debug_printf ("ImpersonateLoggedOnUser: %E"); \
else \
set_privilege (_dup_token, (_priv), (_val)); \
}
#define push_thread_privilege(_priv, _val) _push_thread_privilege(_priv,_val,1)
#define push_self_privilege(_priv, _val) _push_thread_privilege(_priv,_val,0)
#define pop_thread_privilege() \
if (_dup_token) \
{ \
ImpersonateLoggedOnUser (_token); \
CloseHandle (_dup_token); \
} \
}
#define pop_self_privilege() pop_thread_privilege()
/* shared.cc: */
/* Retrieve a security descriptor that allows all access */

2
winsup/cygwin/spawn.cc
View File

@ -711,7 +711,7 @@ spawn_guts (const char * prog_arg, const char *const *argv,
ciresrv.moreinfo->envp = build_env (envp, envblock, ciresrv.moreinfo->envc,
real_path.iscygexec ());
newheap = cygheap_setup_for_child (&ciresrv, cygheap->fdtab.need_fixup_before ());
rc = CreateProcessAsUser (cygheap->user.token (),
rc = CreateProcessAsUser (cygheap->user.primary_token (),
runpath, /* image name - with full path */
one_line.buf, /* what was passed to exec */
&sec_none_nih, /* process security attrs */

197
winsup/cygwin/syscalls.cc
View File

@ -1698,6 +1698,7 @@ get_osfhandle (int fd)
extern "C" int
statvfs (const char *fname, struct statvfs *sfs)
{
int ret = -1;
char root[CYG_MAX_PATH];
if (check_null_empty_str_errno (fname)
@ -1716,47 +1717,47 @@ statvfs (const char *fname, struct statvfs *sfs)
if (!rootdir (full_path, root))
return -1;
ULARGE_INTEGER availb, freeb, totalb;
DWORD spc, bps, availc, freec, totalc, vsn, maxlen, flags;
BOOL status;
push_thread_privilege (SE_CHANGE_NOTIFY_PRIV, true);
/* GetDiskFreeSpaceEx must be called before GetDiskFreeSpace on
WinME, to avoid the MS KB 314417 bug */
ULARGE_INTEGER availb, freeb, totalb;
BOOL status = GetDiskFreeSpaceEx (root, &availb, &totalb, &freeb);
DWORD spc, bps, availc, freec, totalc;
if (!GetDiskFreeSpace (root, &spc, &bps, &freec, &totalc))
status = GetDiskFreeSpaceEx (root, &availb, &totalb, &freeb);
if (GetDiskFreeSpace (root, &spc, &bps, &freec, &totalc))
{
__seterrno ();
return -1;
if (status)
{
availc = availb.QuadPart / (spc*bps);
totalc = totalb.QuadPart / (spc*bps);
freec = freeb.QuadPart / (spc*bps);
}
else
availc = freec;
if (GetVolumeInformation (root, NULL, 0, &vsn, &maxlen, &flags, NULL, 0))
{
sfs->f_bsize = spc*bps;
sfs->f_frsize = spc*bps;
sfs->f_blocks = totalc;
sfs->f_bfree = freec;
sfs->f_bavail = availc;
sfs->f_files = ULONG_MAX;
sfs->f_ffree = ULONG_MAX;
sfs->f_favail = ULONG_MAX;
sfs->f_fsid = vsn;
sfs->f_flag = flags;
sfs->f_namemax = maxlen;
ret = 0;
}
}
if (ret)
__seterrno ();
if (status)
{
availc = availb.QuadPart / (spc*bps);
totalc = totalb.QuadPart / (spc*bps);
freec = freeb.QuadPart / (spc*bps);
}
else
availc = freec;
pop_thread_privilege ();
DWORD vsn, maxlen, flags;
if (!GetVolumeInformation (root, NULL, 0, &vsn, &maxlen, &flags, NULL, 0))
{
__seterrno ();
return -1;
}
sfs->f_bsize = spc*bps;
sfs->f_frsize = spc*bps;
sfs->f_blocks = totalc;
sfs->f_bfree = freec;
sfs->f_bavail = availc;
sfs->f_files = ULONG_MAX;
sfs->f_ffree = ULONG_MAX;
sfs->f_favail = ULONG_MAX;
sfs->f_fsid = vsn;
sfs->f_flag = flags;
sfs->f_namemax = maxlen;
return 0;
return ret;
}
extern "C" int
@ -1968,11 +1969,9 @@ seteuid32 (__uid32_t uid)
cygsid usersid;
user_groups &groups = cygheap->user.groups;
HANDLE ptok, new_token = INVALID_HANDLE_VALUE;
HANDLE new_token = INVALID_HANDLE_VALUE;
struct passwd * pw_new;
bool token_is_internal, issamesid = false;
char dacl_buf[MAX_DACL_LEN (5)];
TOKEN_DEFAULT_DACL tdacl = {};
pw_new = internal_getpwuid (uid);
if (!wincap.has_security () && pw_new)
@ -1986,29 +1985,24 @@ seteuid32 (__uid32_t uid)
return -1;
}
RevertToSelf ();
if (!OpenProcessToken (hMainProc, TOKEN_QUERY | TOKEN_ADJUST_DEFAULT, &ptok))
{
__seterrno ();
goto failed_ptok;;
}
cygheap->user.deimpersonate ();
/* Verify if the process token is suitable. */
if (verify_token (ptok, usersid, groups))
new_token = ptok;
if (verify_token (hProcToken, usersid, groups))
new_token = hProcToken;
/* Verify if the external token is suitable */
else if (cygheap->user.external_token != NO_IMPERSONATION
&& verify_token (cygheap->user.external_token, usersid, groups))
new_token = cygheap->user.external_token;
/* Verify if the current token (internal or former external) is suitable */
else if (cygheap->user.current_token != NO_IMPERSONATION
&& cygheap->user.current_token != cygheap->user.external_token
&& verify_token (cygheap->user.current_token, usersid, groups,
else if (cygheap->user.curr_primary_token != NO_IMPERSONATION
&& cygheap->user.curr_primary_token != cygheap->user.external_token
&& verify_token (cygheap->user.curr_primary_token, usersid, groups,
&token_is_internal))
new_token = cygheap->user.current_token;
new_token = cygheap->user.curr_primary_token;
/* Verify if the internal token is suitable */
else if (cygheap->user.internal_token != NO_IMPERSONATION
&& cygheap->user.internal_token != cygheap->user.current_token
&& cygheap->user.internal_token != cygheap->user.curr_primary_token
&& verify_token (cygheap->user.internal_token, usersid, groups,
&token_is_internal))
new_token = cygheap->user.internal_token;
@ -2026,7 +2020,10 @@ seteuid32 (__uid32_t uid)
debug_printf ("create token failed, try subauthentication.");
new_token = subauth (pw_new);
if (new_token == INVALID_HANDLE_VALUE)
goto failed;
{
cygheap->user.reimpersonate ();
return -1;
}
}
/* Keep at most one internal token */
if (cygheap->user.internal_token != NO_IMPERSONATION)
@ -2034,17 +2031,7 @@ seteuid32 (__uid32_t uid)
cygheap->user.internal_token = new_token;
}
/* Set process def dacl to allow access to impersonated token */
if (sec_acl ((PACL) dacl_buf, true, true, usersid))
{
tdacl.DefaultDacl = (PACL) dacl_buf;
if (!SetTokenInformation (ptok, TokenDefaultDacl,
&tdacl, sizeof dacl_buf))
debug_printf ("SetTokenInformation"
"(TokenDefaultDacl), %E");
}
if (new_token != ptok)
if (new_token != hProcToken)
{
/* Avoid having HKCU use default user */
char name[128];
@ -2053,26 +2040,48 @@ seteuid32 (__uid32_t uid)
/* Try setting owner to same value as user. */
if (!SetTokenInformation (new_token, TokenOwner,
&usersid, sizeof usersid))
debug_printf ("SetTokenInformation(user.token, "
"TokenOwner), %E");
debug_printf ("SetTokenInformation(user.token, TokenOwner), %E");
/* Try setting primary group in token to current group */
if (!SetTokenInformation (new_token, TokenPrimaryGroup,
&groups.pgsid, sizeof (cygsid)))
debug_printf ("SetTokenInformation(user.token, "
"TokenPrimaryGroup), %E");
debug_printf ("SetTokenInformation(user.token, TokenPrimaryGroup), %E");
/* Try setting default DACL */
if (tdacl.DefaultDacl
&& !SetTokenInformation (new_token, TokenDefaultDacl,
&tdacl, sizeof (tdacl)))
debug_printf ("SetTokenInformation (TokenDefaultDacl), %E");
char dacl_buf[MAX_DACL_LEN (5)];
if (sec_acl ((PACL) dacl_buf, true, true, usersid))
{
TOKEN_DEFAULT_DACL tdacl = { (PACL) dacl_buf };
if (!SetTokenInformation (new_token, TokenDefaultDacl,
&tdacl, sizeof (tdacl)))
debug_printf ("SetTokenInformation (TokenDefaultDacl), %E");
}
}
CloseHandle (ptok);
issamesid = (usersid == cygheap->user.sid ());
cygheap->user.set_sid (usersid);
cygheap->user.current_token = new_token == ptok ? NO_IMPERSONATION
: new_token;
cygheap->user.reimpersonate ();
cygheap->user.curr_primary_token = new_token == hProcToken ? NO_IMPERSONATION
: new_token;
if (cygheap->user.current_token != NO_IMPERSONATION)
{
CloseHandle (cygheap->user.current_token);
cygheap->user.current_token = NO_IMPERSONATION;
}
if (cygheap->user.curr_primary_token != NO_IMPERSONATION)
{
if (!DuplicateTokenEx (cygheap->user.curr_primary_token, MAXIMUM_ALLOWED,
&sec_none, SecurityImpersonation,
TokenImpersonation, &cygheap->user.current_token))
{
__seterrno ();
cygheap->user.curr_primary_token = NO_IMPERSONATION;
return -1;
}
set_cygwin_privileges (cygheap->user.current_token);
}
if (!cygheap->user.reimpersonate ())
{
__seterrno ();
return -1;
}
success_9x:
cygheap->user.set_name (pw_new->pw_name);
@ -2081,12 +2090,6 @@ success_9x:
if (!issamesid)
user_shared_initialize (true);
return 0;
failed:
CloseHandle (ptok);
failed_ptok:
cygheap->user.reimpersonate ();
return -1;
}
extern "C" int
@ -2151,7 +2154,6 @@ setegid32 (__gid32_t gid)
user_groups * groups = &cygheap->user.groups;
cygsid gsid;
HANDLE ptok;
struct __group32 * gr = internal_getgrgid (gid);
if (!gsid.getfromgr (gr))
@ -2162,29 +2164,24 @@ setegid32 (__gid32_t gid)
myself->gid = gid;
groups->update_pgrp (gsid);
/* If impersonated, update primary group and revert */
if (cygheap->user.issetuid ())
{
if (!SetTokenInformation (cygheap->user.token (),
TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(thread, "
/* If impersonated, update impersonation token... */
if (!SetTokenInformation (cygheap->user.primary_token (),
TokenPrimaryGroup, &gsid, sizeof gsid))
debug_printf ("SetTokenInformation(primary_token, "
"TokenPrimaryGroup), %E");
RevertToSelf ();
}
if (!OpenProcessToken (hMainProc, TOKEN_ADJUST_DEFAULT, &ptok))
debug_printf ("OpenProcessToken(), %E");
else
{
if (!SetTokenInformation (ptok, TokenPrimaryGroup,
if (!SetTokenInformation (cygheap->user.token (), TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(process, "
"TokenPrimaryGroup), %E");
CloseHandle (ptok);
debug_printf ("SetTokenInformation(token, TokenPrimaryGroup), %E");
}
if (cygheap->user.issetuid ()
&& !ImpersonateLoggedOnUser (cygheap->user.token ()))
system_printf ("Impersonating in setegid failed, %E");
cygheap->user.deimpersonate ();
if (!SetTokenInformation (hProcToken, TokenPrimaryGroup, &gsid, sizeof gsid))
debug_printf ("SetTokenInformation(hProcToken, TokenPrimaryGroup), %E");
if (!SetTokenInformation (hProcImpToken, TokenPrimaryGroup, &gsid,
sizeof gsid))
debug_printf ("SetTokenInformation(hProcImpToken, TokenPrimaryGroup), %E");
cygheap->user.reimpersonate ();
return 0;
}

39
winsup/cygwin/uinfo.cc
View File

@ -44,51 +44,45 @@ cygheap_user::init ()
if (!wincap.has_security ())
return;
HANDLE ptok;
DWORD siz;
PSECURITY_DESCRIPTOR psd;
if (!OpenProcessToken (hMainProc, TOKEN_ADJUST_DEFAULT | TOKEN_QUERY,
&ptok))
{
system_printf ("OpenProcessToken(), %E");
return;
}
if (!GetTokenInformation (ptok, TokenPrimaryGroup,
if (!GetTokenInformation (hProcToken, TokenPrimaryGroup,
&groups.pgsid, sizeof (cygsid), &siz))
system_printf ("GetTokenInformation (TokenPrimaryGroup), %E");
/* Get the SID from current process and store it in effec_cygsid */
if (!GetTokenInformation (ptok, TokenUser, &effec_cygsid, sizeof (cygsid), &siz))
if (!GetTokenInformation (hProcToken, TokenUser, &effec_cygsid,
sizeof (cygsid), &siz))
{
system_printf ("GetTokenInformation (TokenUser), %E");
goto out;
return;
}
/* Set token owner to the same value as token user */
if (!SetTokenInformation (ptok, TokenOwner, &effec_cygsid, sizeof (cygsid)))
if (!SetTokenInformation (hProcToken, TokenOwner, &effec_cygsid,
sizeof (cygsid)))
debug_printf ("SetTokenInformation(TokenOwner), %E");
/* Standard way to build a security descriptor with the usual DACL */
char sa_buf[1024];
psd = (PSECURITY_DESCRIPTOR) (sec_user_nih (sa_buf, sid()))->lpSecurityDescriptor;
psd = (PSECURITY_DESCRIPTOR)
(sec_user_nih (sa_buf, sid()))->lpSecurityDescriptor;
BOOL acl_exists, dummy;
TOKEN_DEFAULT_DACL dacl;
if (GetSecurityDescriptorDacl (psd, &acl_exists,
&dacl.DefaultDacl, &dummy)
if (GetSecurityDescriptorDacl (psd, &acl_exists, &dacl.DefaultDacl, &dummy)
&& acl_exists && dacl.DefaultDacl)
{
/* Set the default DACL and the process DACL */
if (!SetTokenInformation (ptok, TokenDefaultDacl, &dacl, sizeof (dacl)))
if (!SetTokenInformation (hProcToken, TokenDefaultDacl, &dacl,
sizeof (dacl)))
system_printf ("SetTokenInformation (TokenDefaultDacl), %E");
if (!SetKernelObjectSecurity (hMainProc, DACL_SECURITY_INFORMATION, psd))
system_printf ("SetKernelObjectSecurity, %E");
}
else
system_printf("Cannot get dacl, %E");
out:
CloseHandle (ptok);
}
void
@ -115,17 +109,17 @@ internal_getlogin (cygheap_user &user)
cygsid gsid;
if (gsid.getfromgr (internal_getgrgid (pw->pw_gid)))
{
HANDLE ptok;
if (gsid != user.groups.pgsid
&& OpenProcessToken (hMainProc, TOKEN_ADJUST_DEFAULT, &ptok))
if (gsid != user.groups.pgsid)
{
/* Set primary group to the group in /etc/passwd. */
if (!SetTokenInformation (ptok, TokenPrimaryGroup,
if (!SetTokenInformation (hProcToken, TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(TokenPrimaryGroup), %E");
if (!SetTokenInformation (hProcImpToken, TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(TokenPrimaryGroup), %E");
else
user.groups.pgsid = gsid;
CloseHandle (ptok);
}
}
else
@ -162,6 +156,7 @@ uinfo_init ()
cygheap->user.saved_gid = cygheap->user.real_gid = myself->gid;
cygheap->user.external_token = NO_IMPERSONATION;
cygheap->user.internal_token = NO_IMPERSONATION;
cygheap->user.curr_primary_token = NO_IMPERSONATION;
cygheap->user.current_token = NO_IMPERSONATION;
cygheap->user.set_saved_sid (); /* Update the original sid */
}

2
winsup/cygwin/winsup.h
View File

@ -343,6 +343,8 @@ extern bool display_title;
extern HANDLE hMainThread;
extern HANDLE hMainProc;
extern HANDLE hProcToken;
extern HANDLE hProcImpToken;
extern bool cygwin_testing;