Scott Baker | 8487c5d | 2019-10-18 12:49:46 -0700 | [diff] [blame^] | 1 | package pac |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "encoding/binary" |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | |
| 9 | "gopkg.in/jcmturner/rpc.v1/mstypes" |
| 10 | "gopkg.in/jcmturner/rpc.v1/ndr" |
| 11 | ) |
| 12 | |
| 13 | const ( |
| 14 | // NTLMSupCredLMOWF indicates that the LM OWF member is present and valid. |
| 15 | NTLMSupCredLMOWF uint32 = 31 |
| 16 | // NTLMSupCredNTOWF indicates that the NT OWF member is present and valid. |
| 17 | NTLMSupCredNTOWF uint32 = 30 |
| 18 | ) |
| 19 | |
| 20 | // NTLMSupplementalCred implements https://msdn.microsoft.com/en-us/library/cc237949.aspx |
| 21 | type NTLMSupplementalCred struct { |
| 22 | Version uint32 // A 32-bit unsigned integer that defines the credential version.This field MUST be 0x00000000. |
| 23 | Flags uint32 |
| 24 | LMPassword []byte // A 16-element array of unsigned 8-bit integers that define the LM OWF. The LMPassword member MUST be ignored if the L flag is not set in the Flags member. |
| 25 | NTPassword []byte // A 16-element array of unsigned 8-bit integers that define the NT OWF. The NTPassword member MUST be ignored if the N flag is not set in the Flags member. |
| 26 | } |
| 27 | |
| 28 | // Unmarshal converts the bytes provided into a NTLMSupplementalCred. |
| 29 | func (c *NTLMSupplementalCred) Unmarshal(b []byte) (err error) { |
| 30 | r := mstypes.NewReader(bytes.NewReader(b)) |
| 31 | c.Version, err = r.Uint32() |
| 32 | if err != nil { |
| 33 | return |
| 34 | } |
| 35 | if c.Version != 0 { |
| 36 | err = errors.New("NTLMSupplementalCred version is not zero") |
| 37 | return |
| 38 | } |
| 39 | c.Flags, err = r.Uint32() |
| 40 | if err != nil { |
| 41 | return |
| 42 | } |
| 43 | if isFlagSet(c.Flags, NTLMSupCredLMOWF) { |
| 44 | c.LMPassword, err = r.ReadBytes(16) |
| 45 | if err != nil { |
| 46 | return |
| 47 | } |
| 48 | } |
| 49 | if isFlagSet(c.Flags, NTLMSupCredNTOWF) { |
| 50 | c.NTPassword, err = r.ReadBytes(16) |
| 51 | if err != nil { |
| 52 | return |
| 53 | } |
| 54 | } |
| 55 | return |
| 56 | } |
| 57 | |
| 58 | // isFlagSet tests if a flag is set in the uint32 little endian flag |
| 59 | func isFlagSet(f uint32, i uint32) bool { |
| 60 | //Which byte? |
| 61 | b := int(i / 8) |
| 62 | //Which bit in byte |
| 63 | p := uint(7 - (int(i) - 8*b)) |
| 64 | fb := make([]byte, 4) |
| 65 | binary.LittleEndian.PutUint32(fb, f) |
| 66 | if fb[b]&(1<<p) != 0 { |
| 67 | return true |
| 68 | } |
| 69 | return false |
| 70 | } |
| 71 | |
| 72 | // SECPKGSupplementalCred implements https://msdn.microsoft.com/en-us/library/cc237956.aspx |
| 73 | // The SECPKG_SUPPLEMENTAL_CRED structure defines the name of the security package that requires |
| 74 | // supplemental credentials and the credential buffer for that package. |
| 75 | // The SECPKG_SUPPLEMENTAL_CRED structure is marshaled by RPC. |
| 76 | type SECPKGSupplementalCred struct { |
| 77 | PackageName mstypes.RPCUnicodeString |
| 78 | CredentialSize uint32 |
| 79 | Credentials []uint8 `ndr:"pointer,conformant"` // Is a ptr. Size is the value of CredentialSize |
| 80 | } |
| 81 | |
| 82 | // Unmarshal converts the bytes provided into a SECPKGSupplementalCred. |
| 83 | func (c *SECPKGSupplementalCred) Unmarshal(b []byte) (err error) { |
| 84 | dec := ndr.NewDecoder(bytes.NewReader(b)) |
| 85 | err = dec.Decode(c) |
| 86 | if err != nil { |
| 87 | err = fmt.Errorf("error unmarshaling SECPKGSupplementalCred: %v", err) |
| 88 | } |
| 89 | return |
| 90 | } |