traefik/middlewares/authenticator.go

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package middlewares
import (
"fmt"
"io/ioutil"
"net/http"
"strings"
"github.com/abbot/go-http-auth"
"github.com/codegangsta/negroni"
"github.com/containous/traefik/log"
"github.com/containous/traefik/types"
)
// Authenticator is a middleware that provides HTTP basic and digest authentication
type Authenticator struct {
handler negroni.Handler
users map[string]string
}
// NewAuthenticator builds a new Autenticator given a config
func NewAuthenticator(authConfig *types.Auth) (*Authenticator, error) {
if authConfig == nil {
return nil, fmt.Errorf("Error creating Authenticator: auth is nil")
}
var err error
authenticator := Authenticator{}
if authConfig.Basic != nil {
authenticator.users, err = parserBasicUsers(authConfig.Basic)
if err != nil {
return nil, err
}
basicAuth := auth.NewBasicAuthenticator("traefik", authenticator.secretBasic)
authenticator.handler = negroni.HandlerFunc(func(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
if username := basicAuth.CheckAuth(r); username == "" {
log.Debug("Basic auth failed...")
basicAuth.RequireAuth(w, r)
} else {
log.Debug("Basic auth success...")
if authConfig.HeaderField != "" {
r.Header[authConfig.HeaderField] = []string{username}
}
next.ServeHTTP(w, r)
}
})
} else if authConfig.Digest != nil {
authenticator.users, err = parserDigestUsers(authConfig.Digest)
if err != nil {
return nil, err
}
digestAuth := auth.NewDigestAuthenticator("traefik", authenticator.secretDigest)
authenticator.handler = negroni.HandlerFunc(func(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
if username, _ := digestAuth.CheckAuth(r); username == "" {
log.Debug("Digest auth failed...")
digestAuth.RequireAuth(w, r)
} else {
log.Debug("Digest auth success...")
if authConfig.HeaderField != "" {
r.Header[authConfig.HeaderField] = []string{username}
}
next.ServeHTTP(w, r)
}
})
}
return &authenticator, nil
}
func parserBasicUsers(basic *types.Basic) (map[string]string, error) {
var userStrs []string
if basic.UsersFile != "" {
var err error
if userStrs, err = getLinesFromFile(basic.UsersFile); err != nil {
return nil, err
}
}
userStrs = append(basic.Users, userStrs...)
userMap := make(map[string]string)
for _, user := range userStrs {
split := strings.Split(user, ":")
if len(split) != 2 {
return nil, fmt.Errorf("Error parsing Authenticator user: %v", user)
}
userMap[split[0]] = split[1]
}
return userMap, nil
}
func parserDigestUsers(digest *types.Digest) (map[string]string, error) {
var userStrs []string
if digest.UsersFile != "" {
var err error
if userStrs, err = getLinesFromFile(digest.UsersFile); err != nil {
return nil, err
}
}
userStrs = append(digest.Users, userStrs...)
userMap := make(map[string]string)
for _, user := range userStrs {
split := strings.Split(user, ":")
if len(split) != 3 {
return nil, fmt.Errorf("Error parsing Authenticator user: %v", user)
}
userMap[split[0]+":"+split[1]] = split[2]
}
return userMap, nil
}
func getLinesFromFile(filename string) ([]string, error) {
dat, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
// Trim lines and filter out blanks
rawLines := strings.Split(string(dat), "\n")
var filteredLines []string
for _, rawLine := range rawLines {
line := strings.TrimSpace(rawLine)
if line != "" {
filteredLines = append(filteredLines, line)
}
}
return filteredLines, nil
}
func (a *Authenticator) secretBasic(user, realm string) string {
if secret, ok := a.users[user]; ok {
return secret
}
log.Debugf("User not found: %s", user)
return ""
}
func (a *Authenticator) secretDigest(user, realm string) string {
if secret, ok := a.users[user+":"+realm]; ok {
return secret
}
log.Debugf("User not found: %s:%s", user, realm)
return ""
}
func (a *Authenticator) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
a.handler.ServeHTTP(rw, r, next)
}