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sechost: Reject string SIDs with too many characters. 

Signed-off-by: Esme Povirk <esme@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Esme Povirk 2021-06-11 15:10:48 -05:00 committed by Alexandre Julliard
parent ce94c78b2e
commit 9032eeecbe
2 changed files with 51 additions and 24 deletions
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17
dlls/advapi32/tests/security.c
View File

@ -338,6 +338,20 @@ static void test_ConvertStringSidToSid(void)
"expected GetLastError() is ERROR_INVALID_SID, got %d\n",
GetLastError() );
r = ConvertStringSidToSidA( "WDandmorecharacters", &psid );
ok( !r,
"expected failure with too many characters\n" );
ok( GetLastError() == ERROR_INVALID_SID,
"expected GetLastError() is ERROR_INVALID_SID, got %d\n",
GetLastError() );
r = ConvertStringSidToSidA( "WD)", &psid );
ok( !r,
"expected failure with too many characters\n" );
ok( GetLastError() == ERROR_INVALID_SID,
"expected GetLastError() is ERROR_INVALID_SID, got %d\n",
GetLastError() );
ok(ConvertStringSidToSidA("S-1-5-21-93476-23408-4576", &psid), "ConvertStringSidToSidA failed\n");
pisid = psid;
ok(pisid->SubAuthorityCount == 4, "Invalid sub authority count - expected 4, got %d\n", pisid->SubAuthorityCount);
@ -4237,7 +4251,8 @@ static void test_ConvertStringSecurityDescriptor(void)
{ "", SDDL_REVISION_1, TRUE },
/* test ACE string SID */
{ "D:(D;;GA;;;S-1-0-0)", SDDL_REVISION_1, TRUE },
{ "D:(D;;GA;;;Nonexistent account)", SDDL_REVISION_1, FALSE, ERROR_INVALID_ACL, ERROR_INVALID_SID } /* W2K */
{ "D:(D;;GA;;;WDANDSUCH)", SDDL_REVISION_1, FALSE, ERROR_INVALID_ACL },
{ "D:(D;;GA;;;Nonexistent account)", SDDL_REVISION_1, FALSE, ERROR_INVALID_ACL, ERROR_INVALID_SID }, /* W2K */
};
for (i = 0; i < ARRAY_SIZE(cssd); i++)

58
dlls/sechost/security.c
View File

@ -18,6 +18,7 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
@ -593,18 +594,22 @@ static BOOL get_computer_sid( PSID sid )
return TRUE;
}
static DWORD get_sid_size( const WCHAR *string )
static DWORD get_sid_size( const WCHAR *string, const WCHAR **end )
{
if (string[0] == 'S' && string[1] == '-') /* S-R-I(-S)+ */
{
int token_count = 0;
while (*string)
string++;
while (*string == '-' || iswdigit(*string))
{
if (*string == '-')
token_count++;
string++;
}
if (end)
*end = string;
if (token_count >= 3)
return GetSidLengthRequired( token_count - 2 );
}
@ -612,6 +617,9 @@ static DWORD get_sid_size( const WCHAR *string )
{
unsigned int i;
if (end)
*end = string + 2;
for (i = 0; i < ARRAY_SIZE(well_known_sids); i++)
{
if (!wcsncmp( well_known_sids[i].str, string, 2 ))
@ -632,12 +640,12 @@ static DWORD get_sid_size( const WCHAR *string )
return GetSidLengthRequired( 0 );
}
static BOOL parse_sid( const WCHAR *string, SID *pisid, DWORD *size )
static BOOL parse_sid( const WCHAR *string, const WCHAR **end, SID *pisid, DWORD *size )
{
while (*string == ' ')
string++;
*size = get_sid_size( string );
*size = get_sid_size( string, end );
if (!pisid) /* Simply compute the size */
return TRUE;
@ -647,7 +655,7 @@ static BOOL parse_sid( const WCHAR *string, SID *pisid, DWORD *size )
DWORD csubauth = ((*size - GetSidLengthRequired(0)) / sizeof(DWORD));
string += 2; /* Advance to Revision */
pisid->Revision = wcstoul( string, NULL, 10 );
pisid->Revision = wcstoul( string, (WCHAR**)&string, 10 );
if (pisid->Revision != SDDL_REVISION)
{
@ -665,8 +673,6 @@ static BOOL parse_sid( const WCHAR *string, SID *pisid, DWORD *size )
pisid->SubAuthorityCount = csubauth;
/* Advance to identifier authority */
while (*string && *string != '-')
string++;
if (*string == '-')
string++;
@ -675,24 +681,20 @@ static BOOL parse_sid( const WCHAR *string, SID *pisid, DWORD *size )
*/
pisid->IdentifierAuthority.Value[0] = 0;
pisid->IdentifierAuthority.Value[1] = 0;
identAuth = wcstoul( string, NULL, 10 );
identAuth = wcstoul( string, (WCHAR**)&string, 10 );
pisid->IdentifierAuthority.Value[5] = identAuth & 0xff;
pisid->IdentifierAuthority.Value[4] = (identAuth & 0xff00) >> 8;
pisid->IdentifierAuthority.Value[3] = (identAuth & 0xff0000) >> 16;
pisid->IdentifierAuthority.Value[2] = (identAuth & 0xff000000) >> 24;
/* Advance to first sub authority */
while (*string && *string != '-')
string++;
if (*string == '-')
string++;
while (*string)
while (iswdigit(*string) || *string == '-')
{
pisid->SubAuthority[i++] = wcstoul( string, NULL, 10 );
pisid->SubAuthority[i++] = wcstoul( string, (WCHAR**)&string, 10 );
while (*string && *string != '-')
string++;
if (*string == '-')
string++;
}
@ -703,6 +705,9 @@ static BOOL parse_sid( const WCHAR *string, SID *pisid, DWORD *size )
return FALSE;
}
if (end)
assert(*end == string);
return TRUE;
}
else /* String constant format - Only available in winxp and above */
@ -746,6 +751,7 @@ static BOOL parse_sid( const WCHAR *string, SID *pisid, DWORD *size )
BOOL WINAPI DECLSPEC_HOTPATCH ConvertStringSidToSidW( const WCHAR *string, PSID *sid )
{
DWORD size;
const WCHAR *string_end;
TRACE("%s, %p\n", debugstr_w(string), sid);
@ -761,12 +767,18 @@ BOOL WINAPI DECLSPEC_HOTPATCH ConvertStringSidToSidW( const WCHAR *string, PSID
return FALSE;
}
if (!parse_sid( string, NULL, &size ))
if (!parse_sid( string, &string_end, NULL, &size ))
return FALSE;
if (*string_end)
{
SetLastError(ERROR_INVALID_SID);
return FALSE;
}
*sid = LocalAlloc( 0, size );
if (!parse_sid( string, *sid, &size ))
if (!parse_sid( string, NULL, *sid, &size ))
{
LocalFree( *sid );
return FALSE;
@ -996,11 +1008,11 @@ static BOOL parse_acl( const WCHAR *string, DWORD *flags, ACL *acl, DWORD *ret_s
string++;
/* Parse ACE account sid */
if (parse_sid( string, ace ? (SID *)&ace->SidStart : NULL, &sidlen ))
{
while (*string && *string != ')')
string++;
}
if (!parse_sid( string, &string, ace ? (SID *)&ace->SidStart : NULL, &sidlen ))
goto err;
while (*string == ' ')
string++;
if (*string != ')')
goto err;
@ -1095,7 +1107,7 @@ static BOOL parse_sd( const WCHAR *string, SECURITY_DESCRIPTOR_RELATIVE *sd, DWO
{
DWORD bytes;
if (!parse_sid( tok, (SID *)next, &bytes ))
if (!parse_sid( tok, NULL, (SID *)next, &bytes ))
goto out;
if (sd)
@ -1113,7 +1125,7 @@ static BOOL parse_sd( const WCHAR *string, SECURITY_DESCRIPTOR_RELATIVE *sd, DWO
{
DWORD bytes;
if (!parse_sid( tok, (SID *)next, &bytes ))
if (!parse_sid( tok, NULL, (SID *)next, &bytes ))
goto out;
if (sd)