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package mssql
import (
"fmt"
"strings"
"syscall"
"unsafe"
)
var (
secur32_dll = syscall.NewLazyDLL("secur32.dll")
initSecurityInterface = secur32_dll.NewProc("InitSecurityInterfaceW")
sec_fn *SecurityFunctionTable
)
func init() {
ptr, _, _ := initSecurityInterface.Call()
sec_fn = (*SecurityFunctionTable)(unsafe.Pointer(ptr))
}
const (
SEC_E_OK = 0
SECPKG_CRED_OUTBOUND = 2
SEC_WINNT_AUTH_IDENTITY_UNICODE = 2
ISC_REQ_DELEGATE = 0x00000001
ISC_REQ_REPLAY_DETECT = 0x00000004
ISC_REQ_SEQUENCE_DETECT = 0x00000008
ISC_REQ_CONFIDENTIALITY = 0x00000010
ISC_REQ_CONNECTION = 0x00000800
SECURITY_NETWORK_DREP = 0
SEC_I_CONTINUE_NEEDED = 0x00090312
SEC_I_COMPLETE_NEEDED = 0x00090313
SEC_I_COMPLETE_AND_CONTINUE = 0x00090314
SECBUFFER_VERSION = 0
SECBUFFER_TOKEN = 2
NTLMBUF_LEN = 12000
)
const ISC_REQ = ISC_REQ_CONFIDENTIALITY |
ISC_REQ_REPLAY_DETECT |
ISC_REQ_SEQUENCE_DETECT |
ISC_REQ_CONNECTION |
ISC_REQ_DELEGATE
type SecurityFunctionTable struct {
dwVersion uint32
EnumerateSecurityPackages uintptr
QueryCredentialsAttributes uintptr
AcquireCredentialsHandle uintptr
FreeCredentialsHandle uintptr
Reserved2 uintptr
InitializeSecurityContext uintptr
AcceptSecurityContext uintptr
CompleteAuthToken uintptr
DeleteSecurityContext uintptr
ApplyControlToken uintptr
QueryContextAttributes uintptr
ImpersonateSecurityContext uintptr
RevertSecurityContext uintptr
MakeSignature uintptr
VerifySignature uintptr
FreeContextBuffer uintptr
QuerySecurityPackageInfo uintptr
Reserved3 uintptr
Reserved4 uintptr
Reserved5 uintptr
Reserved6 uintptr
Reserved7 uintptr
Reserved8 uintptr
QuerySecurityContextToken uintptr
EncryptMessage uintptr
DecryptMessage uintptr
}
type SEC_WINNT_AUTH_IDENTITY struct {
User *uint16
UserLength uint32
Domain *uint16
DomainLength uint32
Password *uint16
PasswordLength uint32
Flags uint32
}
type TimeStamp struct {
LowPart uint32
HighPart int32
}
type SecHandle struct {
dwLower uintptr
dwUpper uintptr
}
type SecBuffer struct {
cbBuffer uint32
BufferType uint32
pvBuffer *byte
}
type SecBufferDesc struct {
ulVersion uint32
cBuffers uint32
pBuffers *SecBuffer
}
type SSPIAuth struct {
Domain string
UserName string
Password string
Service string
cred SecHandle
ctxt SecHandle
}
func getAuth(user, password, service, workstation string) (Auth, bool) {
if user == "" {
return &SSPIAuth{Service: service}, true
}
if !strings.ContainsRune(user, '\\') {
return nil, false
}
domain_user := strings.SplitN(user, "\\", 2)
return &SSPIAuth{
Domain: domain_user[0],
UserName: domain_user[1],
Password: password,
Service: service,
}, true
}
func (auth *SSPIAuth) InitialBytes() ([]byte, error) {
var identity *SEC_WINNT_AUTH_IDENTITY
if auth.UserName != "" {
identity = &SEC_WINNT_AUTH_IDENTITY{
Flags: SEC_WINNT_AUTH_IDENTITY_UNICODE,
Password: syscall.StringToUTF16Ptr(auth.Password),
PasswordLength: uint32(len(auth.Password)),
Domain: syscall.StringToUTF16Ptr(auth.Domain),
DomainLength: uint32(len(auth.Domain)),
User: syscall.StringToUTF16Ptr(auth.UserName),
UserLength: uint32(len(auth.UserName)),
}
}
var ts TimeStamp
sec_ok, _, _ := syscall.Syscall9(sec_fn.AcquireCredentialsHandle,
9,
0,
uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("Negotiate"))),
SECPKG_CRED_OUTBOUND,
0,
uintptr(unsafe.Pointer(identity)),
0,
0,
uintptr(unsafe.Pointer(&auth.cred)),
uintptr(unsafe.Pointer(&ts)))
if sec_ok != SEC_E_OK {
return nil, fmt.Errorf("AcquireCredentialsHandle failed %x", sec_ok)
}
var buf SecBuffer
var desc SecBufferDesc
desc.ulVersion = SECBUFFER_VERSION
desc.cBuffers = 1
desc.pBuffers = &buf
outbuf := make([]byte, NTLMBUF_LEN)
buf.cbBuffer = NTLMBUF_LEN
buf.BufferType = SECBUFFER_TOKEN
buf.pvBuffer = &outbuf[0]
var attrs uint32
sec_ok, _, _ = syscall.Syscall12(sec_fn.InitializeSecurityContext,
12,
uintptr(unsafe.Pointer(&auth.cred)),
0,
uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(auth.Service))),
ISC_REQ,
0,
SECURITY_NETWORK_DREP,
0,
0,
uintptr(unsafe.Pointer(&auth.ctxt)),
uintptr(unsafe.Pointer(&desc)),
uintptr(unsafe.Pointer(&attrs)),
uintptr(unsafe.Pointer(&ts)))
if sec_ok == SEC_I_COMPLETE_AND_CONTINUE ||
sec_ok == SEC_I_COMPLETE_NEEDED {
syscall.Syscall6(sec_fn.CompleteAuthToken,
2,
uintptr(unsafe.Pointer(&auth.ctxt)),
uintptr(unsafe.Pointer(&desc)),
0, 0, 0, 0)
} else if sec_ok != SEC_E_OK &&
sec_ok != SEC_I_CONTINUE_NEEDED {
syscall.Syscall6(sec_fn.FreeCredentialsHandle,
1,
uintptr(unsafe.Pointer(&auth.cred)),
0, 0, 0, 0, 0)
return nil, fmt.Errorf("InitialBytes InitializeSecurityContext failed %x", sec_ok)
}
return outbuf[:buf.cbBuffer], nil
}
func (auth *SSPIAuth) NextBytes(bytes []byte) ([]byte, error) {
var in_buf, out_buf SecBuffer
var in_desc, out_desc SecBufferDesc
in_desc.ulVersion = SECBUFFER_VERSION
in_desc.cBuffers = 1
in_desc.pBuffers = &in_buf
out_desc.ulVersion = SECBUFFER_VERSION
out_desc.cBuffers = 1
out_desc.pBuffers = &out_buf
in_buf.BufferType = SECBUFFER_TOKEN
in_buf.pvBuffer = &bytes[0]
in_buf.cbBuffer = uint32(len(bytes))
outbuf := make([]byte, NTLMBUF_LEN)
out_buf.BufferType = SECBUFFER_TOKEN
out_buf.pvBuffer = &outbuf[0]
out_buf.cbBuffer = NTLMBUF_LEN
var attrs uint32
var ts TimeStamp
sec_ok, _, _ := syscall.Syscall12(sec_fn.InitializeSecurityContext,
12,
uintptr(unsafe.Pointer(&auth.cred)),
uintptr(unsafe.Pointer(&auth.ctxt)),
uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(auth.Service))),
ISC_REQ,
0,
SECURITY_NETWORK_DREP,
uintptr(unsafe.Pointer(&in_desc)),
0,
uintptr(unsafe.Pointer(&auth.ctxt)),
uintptr(unsafe.Pointer(&out_desc)),
uintptr(unsafe.Pointer(&attrs)),
uintptr(unsafe.Pointer(&ts)))
if sec_ok == SEC_I_COMPLETE_AND_CONTINUE ||
sec_ok == SEC_I_COMPLETE_NEEDED {
syscall.Syscall6(sec_fn.CompleteAuthToken,
2,
uintptr(unsafe.Pointer(&auth.ctxt)),
uintptr(unsafe.Pointer(&out_desc)),
0, 0, 0, 0)
} else if sec_ok != SEC_E_OK &&
sec_ok != SEC_I_CONTINUE_NEEDED {
return nil, fmt.Errorf("NextBytes InitializeSecurityContext failed %x", sec_ok)
}
return outbuf[:out_buf.cbBuffer], nil
}
func (auth *SSPIAuth) Free() {
syscall.Syscall6(sec_fn.DeleteSecurityContext,
1,
uintptr(unsafe.Pointer(&auth.ctxt)),
0, 0, 0, 0, 0)
syscall.Syscall6(sec_fn.FreeCredentialsHandle,
1,
uintptr(unsafe.Pointer(&auth.cred)),
0, 0, 0, 0, 0)
}
|
