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authservice.go
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authservice.go
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/*
* Teleport
* Copyright (C) 2023 Gravitational, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package integration
import (
"bufio"
"bytes"
"context"
"errors"
"io"
"os/exec"
"regexp"
"strings"
"sync"
"syscall"
"time"
"github.com/gravitational/trace"
"github.com/gravitational/teleport/integrations/lib/logger"
)
var regexpAuthStarting = regexp.MustCompile(`Auth service [^ ]+ is starting on [^ ]+:(\d+)`)
type AuthService struct {
mu sync.Mutex
teleportPath string
configPath string
authAddr Addr
isReady bool
readyCh chan struct{}
doneCh chan struct{}
terminate context.CancelFunc
setErr func(error)
setReady func(bool)
error error
stdout strings.Builder
stderr bytes.Buffer
}
func newAuthService(teleportPath, configPath string) *AuthService {
var auth AuthService
var setErrOnce, setReadyOnce sync.Once
readyCh := make(chan struct{})
auth = AuthService{
teleportPath: teleportPath,
configPath: configPath,
readyCh: readyCh,
doneCh: make(chan struct{}),
terminate: func() {}, // dummy noop that will be overridden by Run(),
setErr: func(err error) {
setErrOnce.Do(func() {
auth.mu.Lock()
defer auth.mu.Unlock()
auth.error = err
})
},
setReady: func(isReady bool) {
setReadyOnce.Do(func() {
auth.mu.Lock()
auth.isReady = isReady
auth.mu.Unlock()
close(readyCh)
})
},
}
return &auth
}
// Run spawns an auth server instance.
func (auth *AuthService) Run(ctx context.Context) error {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
log := logger.Get(ctx)
cmd := exec.CommandContext(ctx, auth.teleportPath, "start", "--debug", "--config", auth.configPath)
log.Debugf("Running Auth service: %s", cmd)
stdoutPipe, err := cmd.StdoutPipe()
if err != nil {
err = trace.Wrap(err, "failed to get stdout")
auth.setErr(err)
return err
}
stderrPipe, err := cmd.StderrPipe()
if err != nil {
err = trace.Wrap(err, "failed to get stderr")
auth.setErr(err)
return err
}
if err := cmd.Start(); err != nil {
err = trace.Wrap(err, "failed to start teleport")
auth.setErr(err)
return err
}
ctx, log = logger.WithField(ctx, "pid", cmd.Process.Pid)
log.Debug("Auth service process has been started")
auth.mu.Lock()
var terminateOnce sync.Once
auth.terminate = func() {
terminateOnce.Do(func() {
log.Debug("Terminating Auth service process")
// Signal the process to gracefully terminate by sending SIGQUIT.
if err := cmd.Process.Signal(syscall.SIGQUIT); err != nil {
log.Warn(err)
}
// If we're not done in 5 minutes, just kill the process by canceling its context.
go func() {
select {
case <-auth.doneCh:
case <-time.After(serviceShutdownTimeout):
log.Debug("Killing Auth service process")
}
// cancel() results in sending SIGKILL to a process if it's still alive.
cancel()
}()
})
}
auth.mu.Unlock()
var ioWork sync.WaitGroup
ioWork.Add(2)
// Parse stdout of a Teleport process.
go func() {
defer ioWork.Done()
stdout := bufio.NewReader(stdoutPipe)
for {
line, err := stdout.ReadString('\n')
if errors.Is(err, io.EOF) {
return
}
if err := trace.Wrap(err); err != nil {
log.WithError(err).Error("failed to read process stdout")
return
}
auth.saveStdout(line)
if auth.IsReady() {
continue
}
auth.parseLine(ctx, line)
if addr := auth.AuthAddr(); !addr.IsEmpty() {
log.Debugf("Found addr of Auth service process: %v", addr)
auth.setReady(true)
}
}
}()
// Save stderr to a buffer.
go func() {
defer ioWork.Done()
stderr := bufio.NewReader(stderrPipe)
data := make([]byte, stderr.Size())
for {
n, err := stderr.Read(data)
auth.saveStderr(data[:n])
if errors.Is(err, io.EOF) {
return
}
if err := trace.Wrap(err); err != nil {
log.WithError(err).Error("failed to read process stderr")
return
}
}
}()
// Wait for process completeness after processing both outputs.
go func() {
ioWork.Wait()
err := trace.Wrap(cmd.Wait())
auth.setErr(err)
close(auth.doneCh)
}()
<-auth.doneCh
if !auth.IsReady() {
log.Error("Auth server is failed to initialize")
stdoutLines := strings.Split(auth.Stdout(), "\n")
for _, line := range stdoutLines {
log.Debug("AuthService log: ", line)
}
log.Debugf("AuthService stderr: %q", auth.Stderr())
// If it's still not ready lets signal that it's finally not ready.
auth.setReady(false)
// Set an err just in case if it's not set before.
auth.setErr(trace.Errorf("failed to initialize"))
}
return trace.Wrap(auth.Err())
}
// AuthAddr returns auth service external address.
func (auth *AuthService) AuthAddr() Addr {
auth.mu.Lock()
defer auth.mu.Unlock()
return auth.authAddr
}
// ConfigPath returns auth service config file path.
func (auth *AuthService) ConfigPath() string {
return auth.configPath
}
// Err returns auth server error. It's nil If process is not done yet.
func (auth *AuthService) Err() error {
auth.mu.Lock()
defer auth.mu.Unlock()
return auth.error
}
// Shutdown terminates the auth server process and waits for its completion.
func (auth *AuthService) Shutdown(ctx context.Context) error {
auth.doTerminate()
select {
case <-auth.doneCh:
return nil
case <-ctx.Done():
return trace.Wrap(ctx.Err())
}
}
// Stdout returns a collected auth server process stdout.
func (auth *AuthService) Stdout() string {
auth.mu.Lock()
defer auth.mu.Unlock()
return auth.stdout.String()
}
// Stderr returns a collected auth server process stderr.
func (auth *AuthService) Stderr() string {
auth.mu.Lock()
defer auth.mu.Unlock()
return auth.stderr.String()
}
// WaitReady waits for auth server initialization.
func (auth *AuthService) WaitReady(ctx context.Context) (bool, error) {
select {
case <-auth.readyCh:
return auth.IsReady(), nil
case <-ctx.Done():
return false, trace.Wrap(ctx.Err(), "auth server is not ready")
}
}
// IsReady indicates if auth server is initialized properly.
func (auth *AuthService) IsReady() bool {
auth.mu.Lock()
defer auth.mu.Unlock()
return auth.isReady
}
func (auth *AuthService) doTerminate() {
auth.mu.Lock()
terminate := auth.terminate
auth.mu.Unlock()
terminate()
}
func (auth *AuthService) parseLine(ctx context.Context, line string) {
submatch := regexpAuthStarting.FindStringSubmatch(line)
if submatch != nil {
auth.mu.Lock()
defer auth.mu.Unlock()
auth.authAddr = Addr{Host: "127.0.0.1", Port: submatch[1]}
return
}
}
func (auth *AuthService) saveStdout(line string) {
auth.mu.Lock()
defer auth.mu.Unlock()
auth.stdout.WriteString(line)
}
func (auth *AuthService) saveStderr(chunk []byte) {
auth.mu.Lock()
defer auth.mu.Unlock()
auth.stderr.Write(chunk)
}