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backend_static.go
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/
backend_static.go
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//
// Copyright (c) 2023 whawty contributors (see AUTHORS file)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of whawty.nginx-sso nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
package auth
import (
"fmt"
"log"
"github.com/fsnotify/fsnotify"
"github.com/prometheus/client_golang/prometheus"
"github.com/tg123/go-htpasswd"
)
var (
staticReloadFailed = prometheus.NewGauge(prometheus.GaugeOpts{Subsystem: metricsSubsystem, Name: "static_reload_failed"})
staticReloadLastSuccess = prometheus.NewGauge(prometheus.GaugeOpts{Subsystem: metricsSubsystem, Name: "static_successful_reload_timestamp_seconds"})
)
type StaticConfig struct {
HTPasswd string `yaml:"htpasswd"`
AutoReload bool `yaml:"autoreload"`
}
type StaticBackend struct {
htpasswd *htpasswd.File
infoLog *log.Logger
dbgLog *log.Logger
}
func NewStaticBackend(conf *StaticConfig, prom prometheus.Registerer, infoLog, dbgLog *log.Logger) (Backend, error) {
file, err := htpasswd.New(conf.HTPasswd, htpasswd.DefaultSystems, func(err error) {
dbgLog.Printf("static: found invalid line: %v", err)
})
if err != nil {
infoLog.Printf("static: failed to initialize database: %v", err)
return nil, err
}
b := &StaticBackend{htpasswd: file, infoLog: infoLog, dbgLog: dbgLog}
if conf.AutoReload {
staticReloadLastSuccess.SetToCurrentTime()
runFileWatcher([]string{conf.HTPasswd}, b.watchFileErrorCB, b.watchFileEventCB)
}
if prom != nil {
err = b.initPrometheus(prom)
if err != nil {
return nil, err
}
}
infoLog.Printf("static: successfully initilized database: %s", conf.HTPasswd)
return b, nil
}
func (b *StaticBackend) watchFileErrorCB(err error) {
b.infoLog.Printf("static: got error from fsnotify watcher: %v", err)
}
func (b *StaticBackend) watchFileEventCB(event fsnotify.Event) {
invalidLines := 0
err := b.htpasswd.Reload(func(err error) {
invalidLines = invalidLines + 1
})
if err != nil {
staticReloadFailed.Set(1)
b.infoLog.Printf("static: reloading htpasswd file failed: %v, keeping current database", err)
return
}
staticReloadLastSuccess.SetToCurrentTime()
if invalidLines > 0 {
staticReloadFailed.Set(1)
b.infoLog.Printf("static: reloading htpasswd file was successful but %d invalid lines have been ignored", invalidLines)
return
}
staticReloadFailed.Set(0)
b.dbgLog.Printf("static: htpasswd file successfully reloaded")
}
func (b *StaticBackend) initPrometheus(prom prometheus.Registerer) (err error) {
if err = prom.Register(staticReloadFailed); err != nil {
return
}
if err = prom.Register(staticReloadLastSuccess); err != nil {
return
}
return metricsCommon(prom)
}
func (b *StaticBackend) Authenticate(username, password string) error {
ok := b.htpasswd.Match(username, password)
if !ok {
authRequestsFailed.WithLabelValues().Inc()
return fmt.Errorf("invalid username or password")
}
authRequestsSuccess.WithLabelValues().Inc()
return nil
}