auth.go

// Copyright Project Harbor Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package authproxy

import (
	"crypto/tls"
	"fmt"
	"github.com/goharbor/harbor/src/common"
	"github.com/goharbor/harbor/src/common/dao"
	"github.com/goharbor/harbor/src/common/models"
	"github.com/goharbor/harbor/src/common/utils/log"
	"github.com/goharbor/harbor/src/core/auth"
	"github.com/goharbor/harbor/src/core/config"
	"io/ioutil"
	"net/http"
	"strings"
	"sync"
	"time"
)

const refreshDuration = 2 * time.Second
const userEntryComment = "By Authproxy"

var secureTransport = &http.Transport{}
var insecureTransport = &http.Transport{
	TLSClientConfig: &tls.Config{
		InsecureSkipVerify: true,
	},
}

// Auth implements HTTP authenticator the required attributes.
// The attribute Endpoint is the HTTP endpoint to which the POST request should be issued for authentication
type Auth struct {
	auth.DefaultAuthenticateHelper
	sync.Mutex
	Endpoint         string
	SkipCertVerify   bool
	AlwaysOnboard    bool
	settingTimeStamp time.Time
	client           *http.Client
}

// Authenticate issues http POST request to Endpoint if it returns 200 the authentication is considered success.
func (a *Auth) Authenticate(m models.AuthModel) (*models.User, error) {
	err := a.ensure()
	if err != nil {
		if a.Endpoint == "" {
			return nil, fmt.Errorf("failed to initialize HTTP Auth Proxy Authenticator, error: %v", err)
		}
		log.Warningf("Failed to refresh configuration for HTTP Auth Proxy Authenticator, error: %v, old settings will be used", err)
	}
	req, err := http.NewRequest(http.MethodPost, a.Endpoint, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to send request, error: %v", err)
	}
	req.SetBasicAuth(m.Principal, m.Password)
	resp, err := a.client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode == http.StatusOK {
		return &models.User{Username: m.Principal}, nil
	} else if resp.StatusCode == http.StatusUnauthorized {
		return nil, auth.ErrAuth{}
	} else {
		data, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			log.Warningf("Failed to read response body, error: %v", err)
		}
		return nil, fmt.Errorf("failed to authenticate, status code: %d, text: %s", resp.StatusCode, string(data))
	}

}

// OnBoardUser delegates to dao pkg to insert/update data in DB.
func (a *Auth) OnBoardUser(u *models.User) error {
	return dao.OnBoardUser(u)
}

// PostAuthenticate generates the user model and on board the user.
func (a *Auth) PostAuthenticate(u *models.User) error {
	if res, _ := dao.GetUser(*u); res != nil {
		return nil
	}
	if err := a.fillInModel(u); err != nil {
		return err
	}
	return a.OnBoardUser(u)
}

// SearchUser returns nil as authproxy does not have such capability.
// When AlwaysOnboard is set it always return the default model.
func (a *Auth) SearchUser(username string) (*models.User, error) {
	err := a.ensure()
	if err != nil {
		log.Warningf("Failed to refresh configuration for HTTP Auth Proxy Authenticator, error: %v, the default settings will be used", err)
	}
	var u *models.User
	if a.AlwaysOnboard {
		u = &models.User{Username: username}
		if err := a.fillInModel(u); err != nil {
			return nil, err
		}
	}
	return u, nil
}

func (a *Auth) fillInModel(u *models.User) error {
	if strings.TrimSpace(u.Username) == "" {
		return fmt.Errorf("username cannot be empty")
	}
	u.Realname = u.Username
	u.Password = "1234567ab"
	u.Comment = userEntryComment
	if strings.Contains(u.Username, "@") {
		u.Email = u.Username
	} else {
		u.Email = fmt.Sprintf("%s@placeholder.com", u.Username)
	}
	return nil
}

func (a *Auth) ensure() error {
	a.Lock()
	defer a.Unlock()
	if a.client == nil {
		a.client = &http.Client{}
	}
	if time.Now().Sub(a.settingTimeStamp) >= refreshDuration {
		setting, err := config.HTTPAuthProxySetting()
		if err != nil {
			return err
		}
		a.Endpoint = setting.Endpoint
		a.SkipCertVerify = !setting.VerifyCert
		a.AlwaysOnboard = setting.AlwaysOnBoard
	}
	if a.SkipCertVerify {
		a.client.Transport = insecureTransport
	} else {
		a.client.Transport = secureTransport
	}

	return nil
}

func init() {
	auth.Register(common.HTTPAuth, &Auth{})
}