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htpasswd.go
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/
htpasswd.go
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package main
import (
"crypto/sha1"
"encoding/base64"
"encoding/csv"
"io"
"log"
"os"
"golang.org/x/crypto/bcrypt"
)
// Lookup passwords in a htpasswd file
// Passwords must be generated with -B for bcrypt or -s for SHA1.
type HtpasswdFile struct {
Users map[string]string
}
func NewHtpasswdFromFile(path string) (*HtpasswdFile, error) {
r, err := os.Open(path)
if err != nil {
return nil, err
}
defer r.Close()
return NewHtpasswd(r)
}
func NewHtpasswd(file io.Reader) (*HtpasswdFile, error) {
csv_reader := csv.NewReader(file)
csv_reader.Comma = ':'
csv_reader.Comment = '#'
csv_reader.TrimLeadingSpace = true
records, err := csv_reader.ReadAll()
if err != nil {
return nil, err
}
h := &HtpasswdFile{Users: make(map[string]string)}
for _, record := range records {
h.Users[record[0]] = record[1]
}
return h, nil
}
func (h *HtpasswdFile) Validate(user string, password string) bool {
realPassword, exists := h.Users[user]
if !exists {
return false
}
shaPrefix := realPassword[:5]
if shaPrefix == "{SHA}" {
shaValue := realPassword[5:]
d := sha1.New()
d.Write([]byte(password))
return shaValue == base64.StdEncoding.EncodeToString(d.Sum(nil))
}
bcryptPrefix := realPassword[:4]
if bcryptPrefix == "$2a$" || bcryptPrefix == "$2x$" || bcryptPrefix == "$2y$" {
return bcrypt.CompareHashAndPassword([]byte(realPassword), []byte(password)) == nil
}
log.Printf("Invalid htpasswd entry for %s. Must be a SHA or bcrypt entry.", user)
return false