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52 lines
1.5 KiB
52 lines
1.5 KiB
4 years ago
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// Package ntlmssp provides NTLM/Negotiate authentication over HTTP
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//
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// Protocol details from https://msdn.microsoft.com/en-us/library/cc236621.aspx,
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// implementation hints from http://davenport.sourceforge.net/ntlm.html .
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// This package only implements authentication, no key exchange or encryption. It
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// only supports Unicode (UTF16LE) encoding of protocol strings, no OEM encoding.
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// This package implements NTLMv2.
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package ntlmssp
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import (
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"crypto/hmac"
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"crypto/md5"
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"golang.org/x/crypto/md4"
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"strings"
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)
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func getNtlmV2Hash(password, username, target string) []byte {
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return hmacMd5(getNtlmHash(password), toUnicode(strings.ToUpper(username)+target))
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}
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func getNtlmHash(password string) []byte {
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hash := md4.New()
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hash.Write(toUnicode(password))
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return hash.Sum(nil)
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}
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func computeNtlmV2Response(ntlmV2Hash, serverChallenge, clientChallenge,
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timestamp, targetInfo []byte) []byte {
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temp := []byte{1, 1, 0, 0, 0, 0, 0, 0}
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temp = append(temp, timestamp...)
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temp = append(temp, clientChallenge...)
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temp = append(temp, 0, 0, 0, 0)
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temp = append(temp, targetInfo...)
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temp = append(temp, 0, 0, 0, 0)
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NTProofStr := hmacMd5(ntlmV2Hash, serverChallenge, temp)
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return append(NTProofStr, temp...)
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}
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func computeLmV2Response(ntlmV2Hash, serverChallenge, clientChallenge []byte) []byte {
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return append(hmacMd5(ntlmV2Hash, serverChallenge, clientChallenge), clientChallenge...)
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}
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func hmacMd5(key []byte, data ...[]byte) []byte {
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mac := hmac.New(md5.New, key)
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for _, d := range data {
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mac.Write(d)
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}
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return mac.Sum(nil)
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}
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