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Merge branch 'cr/persistent-https'

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A remote helper that acts as a proxy and caches ssl session for the
https:// transport is added to the contrib/ area.

By Colby Ranger
* cr/persistent-https:
  Add persistent-https to contrib
This commit is contained in:
Junio C Hamano
2012-06-07 09:06:39 -07:00
parent f623ca1cae fe0435011c
commit ecde699a47
7 changed files with 860 additions and 0 deletions
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# Copyright 2012 Google Inc. All Rights Reserved.
#
# 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.
BUILD_LABEL=$(shell date +"%s")
TAR_OUT=$(shell go env GOOS)_$(shell go env GOARCH).tar.gz
all: git-remote-persistent-https git-remote-persistent-https--proxy \
git-remote-persistent-http
git-remote-persistent-https--proxy: git-remote-persistent-https
ln -f -s git-remote-persistent-https git-remote-persistent-https--proxy
git-remote-persistent-http: git-remote-persistent-https
ln -f -s git-remote-persistent-https git-remote-persistent-http
git-remote-persistent-https:
go build -o git-remote-persistent-https \
-ldflags "-X main._BUILD_EMBED_LABEL $(BUILD_LABEL)"
clean:
rm -f git-remote-persistent-http* *.tar.gz
tar: clean all
@chmod 555 git-remote-persistent-https
@tar -czf $(TAR_OUT) git-remote-persistent-http* README LICENSE
@echo
@echo "Created $(TAR_OUT)"

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git-remote-persistent-https
The git-remote-persistent-https binary speeds up SSL operations
by running a daemon job (git-remote-persistent-https--proxy) that
keeps a connection open to a server.
PRE-BUILT BINARIES
Darwin amd64:
https://commondatastorage.googleapis.com/git-remote-persistent-https/darwin_amd64.tar.gz
Linux amd64:
https://commondatastorage.googleapis.com/git-remote-persistent-https/linux_amd64.tar.gz
INSTALLING
Move all of the git-remote-persistent-http* binaries to a directory
in PATH.
USAGE
HTTPS requests can be delegated to the proxy by using the
"persistent-https" scheme, e.g.
git clone persistent-https://kernel.googlesource.com/pub/scm/git/git
Likewise, .gitconfig can be updated as follows to rewrite https urls
to use persistent-https:
[url "persistent-https"]
insteadof = https
[url "persistent-http"]
insteadof = http
#####################################################################
# BUILDING FROM SOURCE
#####################################################################
LOCATION
The source is available in the contrib/persistent-https directory of
the Git source repository. The Git source repository is available at
git://git.kernel.org/pub/scm/git/git.git/
https://kernel.googlesource.com/pub/scm/git/git
PREREQUISITES
The code is written in Go (http://golang.org/) and the Go compiler is
required. Currently, the compiler must be built and installed from tip
of source, in order to include a fix in the reverse http proxy:
http://code.google.com/p/go/source/detail?r=a615b796570a2cd8591884767a7d67ede74f6648
BUILDING
Run "make" to build the binaries. See the section on
INSTALLING above.

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// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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 main
import (
"bufio"
"errors"
"fmt"
"net"
"net/url"
"os"
"os/exec"
"strings"
"syscall"
"time"
)
type Client struct {
ProxyBin string
Args []string
insecure bool
}
func (c *Client) Run() error {
if err := c.resolveArgs(); err != nil {
return fmt.Errorf("resolveArgs() got error: %v", err)
}
// Connect to the proxy.
uconn, hconn, addr, err := c.connect()
if err != nil {
return fmt.Errorf("connect() got error: %v", err)
}
// Keep the unix socket connection open for the duration of the request.
defer uconn.Close()
// Keep a connection to the HTTP server open, so no other user can
// bind on the same address so long as the process is running.
defer hconn.Close()
// Start the git-remote-http subprocess.
cargs := []string{"-c", fmt.Sprintf("http.proxy=%v", addr), "remote-http"}
cargs = append(cargs, c.Args...)
cmd := exec.Command("git", cargs...)
for _, v := range os.Environ() {
if !strings.HasPrefix(v, "GIT_PERSISTENT_HTTPS_SECURE=") {
cmd.Env = append(cmd.Env, v)
}
}
// Set the GIT_PERSISTENT_HTTPS_SECURE environment variable when
// the proxy is using a SSL connection. This allows credential helpers
// to identify secure proxy connections, despite being passed an HTTP
// scheme.
if !c.insecure {
cmd.Env = append(cmd.Env, "GIT_PERSISTENT_HTTPS_SECURE=1")
}
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
if eerr, ok := err.(*exec.ExitError); ok {
if stat, ok := eerr.ProcessState.Sys().(syscall.WaitStatus); ok && stat.ExitStatus() != 0 {
os.Exit(stat.ExitStatus())
}
}
return fmt.Errorf("git-remote-http subprocess got error: %v", err)
}
return nil
}
func (c *Client) connect() (uconn net.Conn, hconn net.Conn, addr string, err error) {
uconn, err = DefaultSocket.Dial()
if err != nil {
if e, ok := err.(*net.OpError); ok && (os.IsNotExist(e.Err) || e.Err == syscall.ECONNREFUSED) {
if err = c.startProxy(); err == nil {
uconn, err = DefaultSocket.Dial()
}
}
if err != nil {
return
}
}
if addr, err = c.readAddr(uconn); err != nil {
return
}
// Open a tcp connection to the proxy.
if hconn, err = net.Dial("tcp", addr); err != nil {
return
}
// Verify the address hasn't changed ownership.
var addr2 string
if addr2, err = c.readAddr(uconn); err != nil {
return
} else if addr != addr2 {
err = fmt.Errorf("address changed after connect. got %q, want %q", addr2, addr)
return
}
return
}
func (c *Client) readAddr(conn net.Conn) (string, error) {
conn.SetDeadline(time.Now().Add(5 * time.Second))
data := make([]byte, 100)
n, err := conn.Read(data)
if err != nil {
return "", fmt.Errorf("error reading unix socket: %v", err)
} else if n == 0 {
return "", errors.New("empty data response")
}
conn.Write([]byte{1}) // Ack
var addr string
if addrs := strings.Split(string(data[:n]), "\n"); len(addrs) != 2 {
return "", fmt.Errorf("got %q, wanted 2 addresses", data[:n])
} else if c.insecure {
addr = addrs[1]
} else {
addr = addrs[0]
}
return addr, nil
}
func (c *Client) startProxy() error {
cmd := exec.Command(c.ProxyBin)
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
defer stdout.Close()
if err := cmd.Start(); err != nil {
return err
}
result := make(chan error)
go func() {
bytes, _, err := bufio.NewReader(stdout).ReadLine()
if line := string(bytes); err == nil && line != "OK" {
err = fmt.Errorf("proxy returned %q, want \"OK\"", line)
}
result <- err
}()
select {
case err := <-result:
return err
case <-time.After(5 * time.Second):
return errors.New("timeout waiting for proxy to start")
}
panic("not reachable")
}
func (c *Client) resolveArgs() error {
if nargs := len(c.Args); nargs == 0 {
return errors.New("remote needed")
} else if nargs > 2 {
return fmt.Errorf("want at most 2 args, got %v", c.Args)
}
// Rewrite the url scheme to be http.
idx := len(c.Args) - 1
rawurl := c.Args[idx]
rurl, err := url.Parse(rawurl)
if err != nil {
return fmt.Errorf("invalid remote: %v", err)
}
c.insecure = rurl.Scheme == "persistent-http"
rurl.Scheme = "http"
c.Args[idx] = rurl.String()
if idx != 0 && c.Args[0] == rawurl {
c.Args[0] = c.Args[idx]
}
return nil
}

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// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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.
// The git-remote-persistent-https binary speeds up SSL operations by running
// a daemon job that keeps a connection open to a Git server. This ensures the
// git-remote-persistent-https--proxy is running and delegating execution
// to the git-remote-http binary with the http_proxy set to the daemon job.
// A unix socket is used to authenticate the proxy and discover the
// HTTP address. Note, both the client and proxy are included in the same
// binary.
package main
import (
"flag"
"fmt"
"log"
"os"
"strings"
"time"
)
var (
forceProxy = flag.Bool("proxy", false, "Whether to start the binary in proxy mode")
proxyBin = flag.String("proxy_bin", "git-remote-persistent-https--proxy", "Path to the proxy binary")
printLabel = flag.Bool("print_label", false, "Prints the build label for the binary")
// Variable that should be defined through the -X linker flag.
_BUILD_EMBED_LABEL string
)
const (
defaultMaxIdleDuration = 24 * time.Hour
defaultPollUpdateInterval = 15 * time.Minute
)
func main() {
flag.Parse()
if *printLabel {
// Short circuit execution to print the build label
fmt.Println(buildLabel())
return
}
var err error
if *forceProxy || strings.HasSuffix(os.Args[0], "--proxy") {
log.SetPrefix("git-remote-persistent-https--proxy: ")
proxy := &Proxy{
BuildLabel: buildLabel(),
MaxIdleDuration: defaultMaxIdleDuration,
PollUpdateInterval: defaultPollUpdateInterval,
}
err = proxy.Run()
} else {
log.SetPrefix("git-remote-persistent-https: ")
client := &Client{
ProxyBin: *proxyBin,
Args: flag.Args(),
}
err = client.Run()
}
if err != nil {
log.Fatalln(err)
}
}
func buildLabel() string {
if _BUILD_EMBED_LABEL == "" {
log.Println(`unlabeled build; build with "make" to label`)
}
return _BUILD_EMBED_LABEL
}

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// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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 main
import (
"fmt"
"log"
"net"
"net/http"
"net/http/httputil"
"os"
"os/exec"
"os/signal"
"sync"
"syscall"
"time"
)
type Proxy struct {
BuildLabel string
MaxIdleDuration time.Duration
PollUpdateInterval time.Duration
ul net.Listener
httpAddr string
httpsAddr string
}
func (p *Proxy) Run() error {
hl, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return fmt.Errorf("http listen failed: %v", err)
}
defer hl.Close()
hsl, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return fmt.Errorf("https listen failed: %v", err)
}
defer hsl.Close()
p.ul, err = DefaultSocket.Listen()
if err != nil {
c, derr := DefaultSocket.Dial()
if derr == nil {
c.Close()
fmt.Println("OK\nA proxy is already running... exiting")
return nil
} else if e, ok := derr.(*net.OpError); ok && e.Err == syscall.ECONNREFUSED {
// Nothing is listening on the socket, unlink it and try again.
syscall.Unlink(DefaultSocket.Path())
p.ul, err = DefaultSocket.Listen()
}
if err != nil {
return fmt.Errorf("unix listen failed on %v: %v", DefaultSocket.Path(), err)
}
}
defer p.ul.Close()
go p.closeOnSignal()
go p.closeOnUpdate()
p.httpAddr = hl.Addr().String()
p.httpsAddr = hsl.Addr().String()
fmt.Printf("OK\nListening on unix socket=%v http=%v https=%v\n",
p.ul.Addr(), p.httpAddr, p.httpsAddr)
result := make(chan error, 2)
go p.serveUnix(result)
go func() {
result <- http.Serve(hl, &httputil.ReverseProxy{
FlushInterval: 500 * time.Millisecond,
Director: func(r *http.Request) {},
})
}()
go func() {
result <- http.Serve(hsl, &httputil.ReverseProxy{
FlushInterval: 500 * time.Millisecond,
Director: func(r *http.Request) {
r.URL.Scheme = "https"
},
})
}()
return <-result
}
type socketContext struct {
sync.WaitGroup
mutex sync.Mutex
last time.Time
}
func (sc *socketContext) Done() {
sc.mutex.Lock()
defer sc.mutex.Unlock()
sc.last = time.Now()
sc.WaitGroup.Done()
}
func (p *Proxy) serveUnix(result chan<- error) {
sockCtx := &socketContext{}
go p.closeOnIdle(sockCtx)
var err error
for {
var uconn net.Conn
uconn, err = p.ul.Accept()
if err != nil {
err = fmt.Errorf("accept failed: %v", err)
break
}
sockCtx.Add(1)
go p.handleUnixConn(sockCtx, uconn)
}
sockCtx.Wait()
result <- err
}
func (p *Proxy) handleUnixConn(sockCtx *socketContext, uconn net.Conn) {
defer sockCtx.Done()
defer uconn.Close()
data := []byte(fmt.Sprintf("%v\n%v", p.httpsAddr, p.httpAddr))
uconn.SetDeadline(time.Now().Add(5 * time.Second))
for i := 0; i < 2; i++ {
if n, err := uconn.Write(data); err != nil {
log.Printf("error sending http addresses: %+v\n", err)
return
} else if n != len(data) {
log.Printf("sent %d data bytes, wanted %d\n", n, len(data))
return
}
if _, err := uconn.Read([]byte{0, 0, 0, 0}); err != nil {
log.Printf("error waiting for Ack: %+v\n", err)
return
}
}
// Wait without a deadline for the client to finish via EOF
uconn.SetDeadline(time.Time{})
uconn.Read([]byte{0, 0, 0, 0})
}
func (p *Proxy) closeOnIdle(sockCtx *socketContext) {
for d := p.MaxIdleDuration; d > 0; {
time.Sleep(d)
sockCtx.Wait()
sockCtx.mutex.Lock()
if d = sockCtx.last.Add(p.MaxIdleDuration).Sub(time.Now()); d <= 0 {
log.Println("graceful shutdown from idle timeout")
p.ul.Close()
}
sockCtx.mutex.Unlock()
}
}
func (p *Proxy) closeOnUpdate() {
for {
time.Sleep(p.PollUpdateInterval)
if out, err := exec.Command(os.Args[0], "--print_label").Output(); err != nil {
log.Printf("error polling for updated binary: %v\n", err)
} else if s := string(out[:len(out)-1]); p.BuildLabel != s {
log.Printf("graceful shutdown from updated binary: %q --> %q\n", p.BuildLabel, s)
p.ul.Close()
break
}
}
}
func (p *Proxy) closeOnSignal() {
ch := make(chan os.Signal, 10)
signal.Notify(ch, os.Interrupt, os.Kill, os.Signal(syscall.SIGTERM), os.Signal(syscall.SIGHUP))
sig := <-ch
p.ul.Close()
switch sig {
case os.Signal(syscall.SIGHUP):
log.Printf("graceful shutdown from signal: %v\n", sig)
default:
log.Fatalf("exiting from signal: %v\n", sig)
}
}

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// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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 main
import (
"fmt"
"log"
"net"
"os"
"path/filepath"
"syscall"
)
// A Socket is a wrapper around a Unix socket that verifies directory
// permissions.
type Socket struct {
Dir string
}
func defaultDir() string {
sockPath := ".git-credential-cache"
if home := os.Getenv("HOME"); home != "" {
return filepath.Join(home, sockPath)
}
log.Printf("socket: cannot find HOME path. using relative directory %q for socket", sockPath)
return sockPath
}
// DefaultSocket is a Socket in the $HOME/.git-credential-cache directory.
var DefaultSocket = Socket{Dir: defaultDir()}
// Listen announces the local network address of the unix socket. The
// permissions on the socket directory are verified before attempting
// the actual listen.
func (s Socket) Listen() (net.Listener, error) {
network, addr := "unix", s.Path()
if err := s.mkdir(); err != nil {
return nil, &net.OpError{Op: "listen", Net: network, Addr: &net.UnixAddr{Name: addr, Net: network}, Err: err}
}
return net.Listen(network, addr)
}
// Dial connects to the unix socket. The permissions on the socket directory
// are verified before attempting the actual dial.
func (s Socket) Dial() (net.Conn, error) {
network, addr := "unix", s.Path()
if err := s.checkPermissions(); err != nil {
return nil, &net.OpError{Op: "dial", Net: network, Addr: &net.UnixAddr{Name: addr, Net: network}, Err: err}
}
return net.Dial(network, addr)
}
// Path returns the fully specified file name of the unix socket.
func (s Socket) Path() string {
return filepath.Join(s.Dir, "persistent-https-proxy-socket")
}
func (s Socket) mkdir() error {
if err := s.checkPermissions(); err == nil {
return nil
} else if !os.IsNotExist(err) {
return err
}
if err := os.MkdirAll(s.Dir, 0700); err != nil {
return err
}
return s.checkPermissions()
}
func (s Socket) checkPermissions() error {
fi, err := os.Stat(s.Dir)
if err != nil {
return err
}
if !fi.IsDir() {
return fmt.Errorf("socket: got file, want directory for %q", s.Dir)
}
if fi.Mode().Perm() != 0700 {
return fmt.Errorf("socket: got perm %o, want 700 for %q", fi.Mode().Perm(), s.Dir)
}
if st := fi.Sys().(*syscall.Stat_t); int(st.Uid) != os.Getuid() {
return fmt.Errorf("socket: got uid %d, want %d for %q", st.Uid, os.Getuid(), s.Dir)
}
return nil
}