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Add Workstation to the User Info

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Add Workstation to the User Info
This commit is contained in:
Görkem Meydan 2023-08-17 14:30:07 +03:00 committed by GitHub
commit b05d65ad37
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12 changed files with 64 additions and 42 deletions
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1
.gitignore vendored
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@ -1 +1,2 @@
pkg pkg
.idea

2
go.mod
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@ -1,3 +1,3 @@
module github.com/vadimi/go-ntlm module github.com/sematext/go-ntlm
go 1.13 go 1.13

0
go.sum
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2
ntlm/crypto.go
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@ -10,7 +10,7 @@ import (
rc4P "crypto/rc4" rc4P "crypto/rc4"
crc32P "hash/crc32" crc32P "hash/crc32"
md4P "github.com/vadimi/go-ntlm/ntlm/md4" md4P "github.com/sematext/go-ntlm/ntlm/md4"
) )
func md4(data []byte) []byte { func md4(data []byte) []byte {

2
ntlm/negotiate_flags.go
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@ -4,7 +4,7 @@ package ntlm
// During NTLM authentication, each of the following flags is a possible value of the NegotiateFlags field of the NEGOTIATE_MESSAGE, // During NTLM authentication, each of the following flags is a possible value of the NegotiateFlags field of the NEGOTIATE_MESSAGE,
// CHALLENGE_MESSAGE, and AUTHENTICATE_MESSAGE, unless otherwise noted. These flags define client or server NTLM capabilities // CHALLENGE_MESSAGE, and AUTHENTICATE_MESSAGE, unless otherwise noted. These flags define client or server NTLM capabilities
// ssupported by the sender. // supported by the sender.
import ( import (
"bytes" "bytes"

9
ntlm/ntlm.go
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@ -1,6 +1,6 @@
//Copyright 2013 Thomson Reuters Global Resources. BSD License please see License file for more information //Copyright 2013 Thomson Reuters Global Resources. BSD License please see License file for more information
// Package NTLM implements the interfaces used for interacting with NTLMv1 and NTLMv2. // Package ntlm implements the interfaces used for interacting with NTLMv1 and NTLMv2.
// To create NTLM v1 or v2 sessions you would use CreateClientSession and create ClientServerSession. // To create NTLM v1 or v2 sessions you would use CreateClientSession and create ClientServerSession.
package ntlm package ntlm
@ -40,7 +40,7 @@ func CreateClientSession(version Version, mode Mode) (n ClientSession, err error
} }
type ClientSession interface { type ClientSession interface {
SetUserInfo(username string, password string, domain string) SetUserInfo(username string, password string, domain string, workstation string)
SetMode(mode Mode) SetMode(mode Mode)
GenerateNegotiateMessage() (*NegotiateMessage, error) GenerateNegotiateMessage() (*NegotiateMessage, error)
@ -71,8 +71,8 @@ func CreateServerSession(version Version, mode Mode) (n ServerSession, err error
} }
type ServerSession interface { type ServerSession interface {
SetUserInfo(username string, password string, domain string) SetUserInfo(username string, password string, domain string, workstation string)
GetUserInfo() (string, string, string) GetUserInfo() (string, string, string, string)
SetMode(mode Mode) SetMode(mode Mode)
SetServerChallenge(challenge []byte) SetServerChallenge(challenge []byte)
@ -97,6 +97,7 @@ type SessionData struct {
user string user string
password string password string
userDomain string userDomain string
workstation string
NegotiateFlags uint32 NegotiateFlags uint32

12
ntlm/ntlmv1.go
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@ -14,18 +14,22 @@ import (
Shared Session Data and Methods Shared Session Data and Methods
*******************************/ *******************************/
// V1Session is the shared data and methods for NTLMv1
type V1Session struct { type V1Session struct {
SessionData SessionData
} }
func (n *V1Session) SetUserInfo(username string, password string, domain string) { // SetUserInfo sets the username, password, domain, and workstation for the session
func (n *V1Session) SetUserInfo(username string, password string, domain string, workstation string) {
n.user = username n.user = username
n.password = password n.password = password
n.userDomain = domain n.userDomain = domain
n.workstation = workstation
} }
func (n *V1Session) GetUserInfo() (string, string, string) { // GetUserInfo returns the username, password, domain and workstation for the session
return n.user, n.password, n.userDomain func (n *V1Session) GetUserInfo() (string, string, string, string) {
return n.user, n.password, n.userDomain, n.workstation
} }
func (n *V1Session) SetMode(mode Mode) { func (n *V1Session) SetMode(mode Mode) {
@ -331,7 +335,7 @@ func (n *V1ClientSession) GenerateAuthenticateMessage() (am *AuthenticateMessage
am.NtChallengeResponseFields, _ = CreateBytePayload(n.ntChallengeResponse) am.NtChallengeResponseFields, _ = CreateBytePayload(n.ntChallengeResponse)
am.DomainName, _ = CreateStringPayload(n.userDomain) am.DomainName, _ = CreateStringPayload(n.userDomain)
am.UserName, _ = CreateStringPayload(n.user) am.UserName, _ = CreateStringPayload(n.user)
am.Workstation, _ = CreateStringPayload("SQUAREMILL") am.Workstation, _ = CreateStringPayload(n.workstation)
am.EncryptedRandomSessionKey, _ = CreateBytePayload(n.encryptedRandomSessionKey) am.EncryptedRandomSessionKey, _ = CreateBytePayload(n.encryptedRandomSessionKey)
am.NegotiateFlags = n.NegotiateFlags am.NegotiateFlags = n.NegotiateFlags
am.Version = &VersionStruct{ProductMajorVersion: uint8(6), ProductMinorVersion: uint8(1), ProductBuild: uint16(7601), NTLMRevisionCurrent: uint8(15)} am.Version = &VersionStruct{ProductMajorVersion: uint8(6), ProductMinorVersion: uint8(1), ProductBuild: uint16(7601), NTLMRevisionCurrent: uint8(15)}

14
ntlm/ntlmv1_test.go
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@ -58,7 +58,7 @@ func TestNtlmV1ExtendedSessionSecurity(t *testing.T) {
if err != nil { if err != nil {
t.Errorf("Could not create NTLMv1 session") t.Errorf("Could not create NTLMv1 session")
} }
context.SetUserInfo("100001.wcp.thomsonreuters.com", "notmypass", "") context.SetUserInfo("100001.wcp.thomsonreuters.com", "notmypass", "", "")
context.SetServerChallenge(c.ServerChallenge) context.SetServerChallenge(c.ServerChallenge)
err = context.ProcessAuthenticateMessage(msg) err = context.ProcessAuthenticateMessage(msg)
if err == nil { if err == nil {
@ -81,7 +81,7 @@ func TestNtlmV1(t *testing.T) {
flags = NTLMSSP_NEGOTIATE_UNICODE.Set(flags) flags = NTLMSSP_NEGOTIATE_UNICODE.Set(flags)
n := new(V1ClientSession) n := new(V1ClientSession)
n.SetUserInfo("User", "Password", "Domain") n.SetUserInfo("User", "Password", "Domain", "")
n.NegotiateFlags = flags n.NegotiateFlags = flags
n.responseKeyNT, _ = hex.DecodeString("a4f49c406510bdcab6824ee7c30fd852") n.responseKeyNT, _ = hex.DecodeString("a4f49c406510bdcab6824ee7c30fd852")
n.responseKeyLM, _ = hex.DecodeString("e52cac67419a9a224a3b108f3fa6cb6d") n.responseKeyLM, _ = hex.DecodeString("e52cac67419a9a224a3b108f3fa6cb6d")
@ -146,14 +146,14 @@ func TestNtlmV1(t *testing.T) {
} }
client := new(V1ClientSession) client := new(V1ClientSession)
client.SetUserInfo("User", "Password", "Domain") client.SetUserInfo("User", "Password", "Domain", "")
err = client.ProcessChallengeMessage(challengeMessage) err = client.ProcessChallengeMessage(challengeMessage)
if err != nil { if err != nil {
t.Errorf("Could not process challenge message: %s", err) t.Errorf("Could not process challenge message: %s", err)
} }
server := new(V1ServerSession) server := new(V1ServerSession)
server.SetUserInfo("User", "Password", "Domain") server.SetUserInfo("User", "Password", "Domain", "")
authenticateMessageBytes, err := hex.DecodeString("4e544c4d5353500003000000180018006c00000018001800840000000c000c00480000000800080054000000100010005c000000100010009c000000358280e20501280a0000000f44006f006d00610069006e00550073006500720043004f004d005000550054004500520098def7b87f88aa5dafe2df779688a172def11c7d5ccdef1367c43011f30298a2ad35ece64f16331c44bdbed927841f94518822b1b3f350c8958682ecbb3e3cb7") authenticateMessageBytes, err := hex.DecodeString("4e544c4d5353500003000000180018006c00000018001800840000000c000c00480000000800080054000000100010005c000000100010009c000000358280e20501280a0000000f44006f006d00610069006e00550073006500720043004f004d005000550054004500520098def7b87f88aa5dafe2df779688a172def11c7d5ccdef1367c43011f30298a2ad35ece64f16331c44bdbed927841f94518822b1b3f350c8958682ecbb3e3cb7")
authenticateMessage, err := ParseAuthenticateMessage(authenticateMessageBytes, 1) authenticateMessage, err := ParseAuthenticateMessage(authenticateMessageBytes, 1)
if err == nil { if err == nil {
@ -163,7 +163,7 @@ func TestNtlmV1(t *testing.T) {
} }
server = new(V1ServerSession) server = new(V1ServerSession)
server.SetUserInfo("User", "Password", "Domain") server.SetUserInfo("User", "Password", "Domain", "")
server.serverChallenge = challengeMessage.ServerChallenge server.serverChallenge = challengeMessage.ServerChallenge
err = server.ProcessAuthenticateMessage(authenticateMessage) err = server.ProcessAuthenticateMessage(authenticateMessage)
@ -212,14 +212,14 @@ func TestNTLMv1WithClientChallenge(t *testing.T) {
} }
client := new(V1ClientSession) client := new(V1ClientSession)
client.SetUserInfo("User", "Password", "Domain") client.SetUserInfo("User", "Password", "Domain", "")
err = client.ProcessChallengeMessage(challengeMessage) err = client.ProcessChallengeMessage(challengeMessage)
if err != nil { if err != nil {
t.Errorf("Could not process challenge message: %s", err) t.Errorf("Could not process challenge message: %s", err)
} }
server := new(V1ServerSession) server := new(V1ServerSession)
server.SetUserInfo("User", "Password", "Domain") server.SetUserInfo("User", "Password", "Domain", "")
server.serverChallenge = challengeMessage.ServerChallenge server.serverChallenge = challengeMessage.ServerChallenge
authenticateMessageBytes, _ := hex.DecodeString("4e544c4d5353500003000000180018006c00000018001800840000000c000c00480000000800080054000000100010005c000000000000009c000000358208820501280a0000000f44006f006d00610069006e00550073006500720043004f004d0050005500540045005200aaaaaaaaaaaaaaaa000000000000000000000000000000007537f803ae367128ca458204bde7caf81e97ed2683267232") authenticateMessageBytes, _ := hex.DecodeString("4e544c4d5353500003000000180018006c00000018001800840000000c000c00480000000800080054000000100010005c000000000000009c000000358208820501280a0000000f44006f006d00610069006e00550073006500720043004f004d0050005500540045005200aaaaaaaaaaaaaaaa000000000000000000000000000000007537f803ae367128ca458204bde7caf81e97ed2683267232")

28
ntlm/ntlmv2.go
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@ -16,24 +16,30 @@ import (
Shared Session Data and Methods Shared Session Data and Methods
*******************************/ *******************************/
// V2Session is the shared session data and methods for NTLMv2
type V2Session struct { type V2Session struct {
SessionData SessionData
} }
func (n *V2Session) SetUserInfo(username string, password string, domain string) { // SetUserInfo sets the username, password, and domain for the session
func (n *V2Session) SetUserInfo(username string, password string, domain string, workstation string) {
n.user = username n.user = username
n.password = password n.password = password
n.userDomain = domain n.userDomain = domain
n.workstation = workstation
} }
func (n *V2Session) GetUserInfo() (string, string, string) { // GetUserInfo returns the username, password, and domain for the session
return n.user, n.password, n.userDomain func (n *V2Session) GetUserInfo() (string, string, string, string) {
return n.user, n.password, n.userDomain, n.workstation
} }
// SetMode sets the mode for the session
func (n *V2Session) SetMode(mode Mode) { func (n *V2Session) SetMode(mode Mode) {
n.mode = mode n.mode = mode
} }
// Version returns the NTLM version of the session
func (n *V2Session) Version() int { func (n *V2Session) Version() int {
return 2 return 2
} }
@ -46,6 +52,7 @@ func (n *V2Session) fetchResponseKeys() (err error) {
return return
} }
// GetSessionData returns the session data for the session
func (n *V2ServerSession) GetSessionData() *SessionData { func (n *V2ServerSession) GetSessionData() *SessionData {
return &n.SessionData return &n.SessionData
} }
@ -175,11 +182,11 @@ func (n *V2ServerSession) GenerateChallengeMessage() (cm *ChallengeMessage, err
// Create the AvPairs we need // Create the AvPairs we need
pairs := new(AvPairs) pairs := new(AvPairs)
pairs.AddAvPair(MsvAvNbDomainName, utf16FromString("REUTERS")) pairs.AddAvPair(MsvAvNbDomainName, utf16FromString("SEMATEXT"))
pairs.AddAvPair(MsvAvNbComputerName, utf16FromString("UKBP-CBTRMFE06")) pairs.AddAvPair(MsvAvNbComputerName, utf16FromString("SYNTHETICS-HTTP-AGENT"))
pairs.AddAvPair(MsvAvDnsDomainName, utf16FromString("Reuters.net")) pairs.AddAvPair(MsvAvDnsDomainName, utf16FromString("sematext.com"))
pairs.AddAvPair(MsvAvDnsComputerName, utf16FromString("ukbp-cbtrmfe06.Reuters.net")) pairs.AddAvPair(MsvAvDnsComputerName, utf16FromString("synthetics-http-agent.sematext.com"))
pairs.AddAvPair(MsvAvDnsTreeName, utf16FromString("Reuters.net")) pairs.AddAvPair(MsvAvDnsTreeName, utf16FromString("Sematext.com"))
pairs.AddAvPair(MsvAvEOL, make([]byte, 0)) pairs.AddAvPair(MsvAvEOL, make([]byte, 0))
cm.TargetInfo = pairs cm.TargetInfo = pairs
cm.TargetInfoPayloadStruct, _ = CreateBytePayload(pairs.Bytes()) cm.TargetInfoPayloadStruct, _ = CreateBytePayload(pairs.Bytes())
@ -197,7 +204,8 @@ func (n *V2ServerSession) ProcessAuthenticateMessage(am *AuthenticateMessage) (e
// They should always be correct (I hope) // They should always be correct (I hope)
n.user = am.UserName.String() n.user = am.UserName.String()
n.userDomain = am.DomainName.String() n.userDomain = am.DomainName.String()
log.Printf("(ProcessAuthenticateMessage)NTLM v2 User %s Domain %s", n.user, n.userDomain) n.workstation = am.Workstation.String()
log.Printf("(ProcessAuthenticateMessage)NTLM v2 User %s Domain %s Workstation %s", n.user, n.userDomain, n.workstation)
err = n.fetchResponseKeys() err = n.fetchResponseKeys()
if err != nil { if err != nil {
@ -351,7 +359,7 @@ func (n *V2ClientSession) GenerateAuthenticateMessage() (am *AuthenticateMessage
am.NtChallengeResponseFields, _ = CreateBytePayload(n.ntChallengeResponse) am.NtChallengeResponseFields, _ = CreateBytePayload(n.ntChallengeResponse)
am.DomainName, _ = CreateStringPayload(n.userDomain) am.DomainName, _ = CreateStringPayload(n.userDomain)
am.UserName, _ = CreateStringPayload(n.user) am.UserName, _ = CreateStringPayload(n.user)
am.Workstation, _ = CreateStringPayload("SQUAREMILL") am.Workstation, _ = CreateStringPayload(n.workstation)
am.EncryptedRandomSessionKey, _ = CreateBytePayload(n.encryptedRandomSessionKey) am.EncryptedRandomSessionKey, _ = CreateBytePayload(n.encryptedRandomSessionKey)
am.NegotiateFlags = n.NegotiateFlags am.NegotiateFlags = n.NegotiateFlags
am.Mic = make([]byte, 16) am.Mic = make([]byte, 16)

8
ntlm/ntlmv2_test.go
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@ -60,7 +60,7 @@ func TestNTLMv2(t *testing.T) {
// Challenge message // Challenge message
client := new(V2ClientSession) client := new(V2ClientSession)
client.SetUserInfo("User", "Password", "Domain") client.SetUserInfo("User", "Password", "Domain", "")
challengeMessageBytes, _ := hex.DecodeString("4e544c4d53535000020000000c000c003800000033828ae20123456789abcdef00000000000000002400240044000000060070170000000f53006500720076006500720002000c0044006f006d00610069006e0001000c0053006500720076006500720000000000") challengeMessageBytes, _ := hex.DecodeString("4e544c4d53535000020000000c000c003800000033828ae20123456789abcdef00000000000000002400240044000000060070170000000f53006500720076006500720002000c0044006f006d00610069006e0001000c0053006500720076006500720000000000")
challengeMessage, err := ParseChallengeMessage(challengeMessageBytes) challengeMessage, err := ParseChallengeMessage(challengeMessageBytes)
@ -76,7 +76,7 @@ func TestNTLMv2(t *testing.T) {
} }
server := new(V2ServerSession) server := new(V2ServerSession)
server.SetUserInfo("User", "Password", "Domain") server.SetUserInfo("User", "Password", "Domain", "")
server.serverChallenge = challengeMessage.ServerChallenge server.serverChallenge = challengeMessage.ServerChallenge
// Authenticate message // Authenticate message
@ -123,7 +123,7 @@ func TestNTLMv2(t *testing.T) {
// Have the client process this server challenge message // Have the client process this server challenge message
client = new(V2ClientSession) client = new(V2ClientSession)
client.SetUserInfo("User", "Password", "Domain") client.SetUserInfo("User", "Password", "Domain", "")
err = client.ProcessChallengeMessage(challenge) err = client.ProcessChallengeMessage(challenge)
if err != nil { if err != nil {
t.Errorf("Could not process server generated challenge message: %s", err) t.Errorf("Could not process server generated challenge message: %s", err)
@ -162,7 +162,7 @@ func TestNTLMv2WithDomain(t *testing.T) {
authenticateMessage := "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" authenticateMessage := "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"
server := new(V2ServerSession) server := new(V2ServerSession)
server.SetUserInfo("blahblah", "Welcome1", "blahblah") server.SetUserInfo("blahblah", "Welcome1", "blahblah", "")
authenticateData, _ := base64.StdEncoding.DecodeString(authenticateMessage) authenticateData, _ := base64.StdEncoding.DecodeString(authenticateMessage)
a, _ := ParseAuthenticateMessage(authenticateData, 2) a, _ := ParseAuthenticateMessage(authenticateData, 2)

8
ntlm/signature.go
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@ -62,10 +62,14 @@ func mac(negFlags uint32, handle *rc4P.Cipher, signingKey []byte, seqNum uint32,
// Set NTLMSSP_MESSAGE_SIGNATURE.Checksum to RC4(Handle, NTLMSSP_MESSAGE_SIGNATURE.Checksum) // Set NTLMSSP_MESSAGE_SIGNATURE.Checksum to RC4(Handle, NTLMSSP_MESSAGE_SIGNATURE.Checksum)
// Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to RC4(Handle, 0x00000000) // Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to RC4(Handle, 0x00000000)
// If (connection oriented) // If (connection oriented)
//
// Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to NTLMSSP_MESSAGE_SIGNATURE.SeqNum XOR SeqNum // Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to NTLMSSP_MESSAGE_SIGNATURE.SeqNum XOR SeqNum
// Set SeqNum to SeqNum + 1 // Set SeqNum to SeqNum + 1
//
// Else // Else
//
// Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to NTLMSSP_MESSAGE_SIGNATURE.SeqNum XOR (application supplied SeqNum) // Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to NTLMSSP_MESSAGE_SIGNATURE.SeqNum XOR (application supplied SeqNum)
//
// EndIf // EndIf
// Set NTLMSSP_MESSAGE_SIGNATURE.RandomPad to 0 // Set NTLMSSP_MESSAGE_SIGNATURE.RandomPad to 0
// End // End
@ -91,9 +95,13 @@ func macWithoutExtendedSessionSecurity(handle *rc4P.Cipher, seqNum uint32, messa
// Define MAC(Handle, SigningKey, SeqNum, Message) as // Define MAC(Handle, SigningKey, SeqNum, Message) as
// Set NTLMSSP_MESSAGE_SIGNATURE.Version to 0x00000001 // Set NTLMSSP_MESSAGE_SIGNATURE.Version to 0x00000001
// if Key Exchange Key Negotiated // if Key Exchange Key Negotiated
//
// Set NTLMSSP_MESSAGE_SIGNATURE.Checksum to RC4(Handle, HMAC_MD5(SigningKey, ConcatenationOf(SeqNum, Message))[0..7]) // Set NTLMSSP_MESSAGE_SIGNATURE.Checksum to RC4(Handle, HMAC_MD5(SigningKey, ConcatenationOf(SeqNum, Message))[0..7])
//
// else // else
//
// Set NTLMSSP_MESSAGE_SIGNATURE.Checksum to HMAC_MD5(SigningKey, ConcatenationOf(SeqNum, Message))[0..7] // Set NTLMSSP_MESSAGE_SIGNATURE.Checksum to HMAC_MD5(SigningKey, ConcatenationOf(SeqNum, Message))[0..7]
//
// end // end
// Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to SeqNum // Set NTLMSSP_MESSAGE_SIGNATURE.SeqNum to SeqNum
// Set SeqNum to SeqNum + 1 // Set SeqNum to SeqNum + 1