防止注入的代码

1
#define
PROTECTED_DACL_SECURITY_INFORMATION (0x80000000L)

2

3
BOOL Lock_CurrentProcess()

4

{
5 HANDLE hProcess = ::GetCurrentProcess();
6 SID_IDENTIFIER_AUTHORITY sia = SECURITY_WORLD_SID_AUTHORITY;
7 PSID pSid;
8 BOOL bSus = FALSE;
9 bSus = ::AllocateAndInitializeSid(&sia,1,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,&pSid);
10 if(!bSus) goto Cleanup;
11 HANDLE hToken;
12 bSus = ::OpenProcessToken(hProcess,TOKEN_QUERY,&hToken);
13 if(!bSus) goto Cleanup;
14 DWORD dwReturnLength;
15 ::GetTokenInformation(hToken,TokenUser,NULL,NULL,&dwReturnLength);
16 if(dwReturnLength > 0x400) goto Cleanup;
17 LPVOID TokenInformation;
18 TokenInformation = ::LocalAlloc(LPTR,0x400);//这里就引用SDK的函数不引
19
20用CRT的了
21 DWORD dw;
22 bSus = ::GetTokenInformation(hToken,TokenUser,TokenInformation,0x400,&dw);
23 if(!bSus) goto Cleanup;
24 PTOKEN_USER pTokenUser = (PTOKEN_USER)TokenInformation;
25 BYTE Buf[0x200];
26 PACL pAcl = (PACL)&Buf;
27 bSus = ::InitializeAcl(pAcl,1024,ACL_REVISION);
28 if(!bSus) goto Cleanup;
29 bSus = ::AddAccessDeniedAce(pAcl,ACL_REVISION,0x000000FA,pSid);
30 if(!bSus) goto Cleanup;
31 bSus = ::AddAccessAllowedAce(pAcl,ACL_REVISION,0x00100701,pTokenUser->User.Sid);
32 if(!bSus) goto Cleanup;
33 if(::SetSecurityInfo(hProcess,SE_KERNEL_OBJECT,DACL_SECURITY_INFORMATION |
34PROTECTED_DACL_SECURITY_INFORMATION,NULL,NULL,pAcl,NULL) == 0)
35 bSus = TRUE;
36Cleanup:
37 if(hProcess != NULL)
38 ::CloseHandle(hProcess);
39 if(pSid != NULL)
40 ::FreeSid(pSid);
41 return bSus;
42
43}

这段代码就可以锁住其他进程打开本进程,当然也就防止了注入,和读写内存.

可以更绝点Denied ALL ACCESS(0xFFFFFFFF)就连结束都不可能了

::AllocateAndInitializeSid 可以换成 :: InitializeSid .因为我们并不需要初始化子Sid.
另外.
bSus = ::AddAccessDeniedAce(pAcl,ACL_REVISION,0x000000FA,pSid);
if(!bSus) goto Cleanup;
bSus = ::AddAccessAllowedAce(pAcl,ACL_REVISION,0x00100701,pTokenUser->User.Sid);
实际上只需要下面的一句,或者干脆把它去掉,因为如果不添加Ace默认就是没有权限.既然这样上面的那句话AllocateAndInitializeSid 也可以省掉,也似乎有些多余