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basic_auth_algos.go
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/
basic_auth_algos.go
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package accesscontrol
import (
"bytes"
"crypto/md5"
"crypto/subtle"
"strings"
"golang.org/x/crypto/bcrypt"
)
const (
pwdPrefixApr1 = "$apr1$"
pwdPrefixBcrypt2a = "$2a$"
pwdPrefixBcrypt2b = "$2b$"
pwdPrefixBcrypt2x = "$2x$"
pwdPrefixBcrypt2y = "$2y$"
pwdPrefixMD5 = "$1$"
)
const (
pwdTypeUnknown = iota
pwdTypeApr1
pwdTypeBcrypt
pwdTypeMD5
)
const (
aprCharacters = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
aprMd5DigestSize = 16
aprMuddleRounds = 1000
)
var pwdPrefixes = map[string]int{
pwdPrefixApr1: pwdTypeApr1,
pwdPrefixBcrypt2a: pwdTypeBcrypt,
pwdPrefixBcrypt2b: pwdTypeBcrypt,
pwdPrefixBcrypt2x: pwdTypeBcrypt,
pwdPrefixBcrypt2y: pwdTypeBcrypt,
pwdPrefixMD5: pwdTypeMD5,
}
type htData map[string]pwd
type pwd struct {
pwdOrig []byte
pwdPrefix string
pwdSalt string
pwdType int
}
func getPwdType(pass string) int {
for p, t := range pwdPrefixes {
if strings.HasPrefix(pass, p) {
return t
}
}
return pwdTypeUnknown
}
func validateAccessData(plainUser, plainPass string, data htData) bool {
for user, pass := range data {
if user == plainUser {
switch pass.pwdType {
case pwdTypeApr1:
fallthrough
case pwdTypeMD5:
if subtle.ConstantTimeCompare(apr1MD5(plainPass, pass.pwdSalt, pass.pwdPrefix), pass.pwdOrig) == 1 {
return true
}
case pwdTypeBcrypt:
if err := bcrypt.CompareHashAndPassword(pass.pwdOrig, []byte(plainPass)); err == nil {
return true
}
}
}
}
return false
}
func apr1MD5(pass, salt, pref string) []byte {
var passLen int = len(pass)
h := md5.New()
h.Write([]byte(pass + salt + pass))
bin := h.Sum(nil)
h.Reset()
h.Write([]byte(pass + pref + salt))
for i := passLen; i > 0; i -= aprMd5DigestSize {
if i > aprMd5DigestSize {
h.Write(bin[0:aprMd5DigestSize])
} else {
h.Write(bin[0:i])
}
}
for i := passLen; i > 0; i >>= 1 {
if (i & 1) == 1 {
h.Write([]byte{0})
} else {
h.Write([]byte(pass[0:1]))
}
}
sum := h.Sum(nil)
for i := 0; i < aprMuddleRounds; i++ {
h.Reset()
if (i & 1) == 1 {
h.Write([]byte(pass))
} else {
h.Write(sum)
}
if (i % 3) != 0 {
h.Write([]byte(salt))
}
if (i % 7) != 0 {
h.Write([]byte(pass))
}
if (i & 1) == 1 {
h.Write(sum)
} else {
h.Write([]byte(pass))
}
copy(sum, h.Sum(nil))
}
buf := bytes.Buffer{}
buf.Grow(len(pref) + len(salt) + 1 + 22)
buf.WriteString(pref)
buf.WriteString(salt)
buf.WriteByte('$')
add := func(a, b, c byte, last bool) {
v := (uint(a) << 16) + (uint(b) << 8) + uint(c)
iterations := 4
if last {
iterations = 2
}
for i := 0; i < iterations; i++ {
buf.WriteByte(aprCharacters[v&0x3f])
v >>= 6
}
}
add(sum[0], sum[6], sum[12], false)
add(sum[1], sum[7], sum[13], false)
add(sum[2], sum[8], sum[14], false)
add(sum[3], sum[9], sum[15], false)
add(sum[4], sum[10], sum[5], false)
add(0, 0, sum[11], true)
return buf.Bytes()
}