epic/play-with-docker
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Merge pull request #24 from xetorthio/ssh

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Add SSH support.
This commit is contained in:
Marcos Nils
2017-06-19 16:01:32 +01:00
committed by GitHub
parent b3c0950a9a 755e3c7707
commit 49ad6cded3
7 changed files with 241 additions and 6 deletions
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4
Dockerfile
View File

@@ -10,14 +10,18 @@ WORKDIR /go/src/github.com/play-with-docker/play-with-docker
RUN go get -v -d ./...
RUN ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null
RUN CGO_ENABLED=0 go build -a -installsuffix nocgo -o /go/bin/play-with-docker .
FROM alpine
RUN apk --update add ca-certificates
RUN mkdir -p /app/pwd
COPY --from=0 /go/bin/play-with-docker /app/play-with-docker
COPY --from=0 /etc/ssh/ssh_host_rsa_key /etc/ssh/ssh_host_rsa_key
COPY ./www /app/www
WORKDIR /app

12
Dockerfile.dind
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@@ -1,7 +1,7 @@
ARG VERSION=docker:17.05.0-ce-dind
FROM ${VERSION}
RUN apk add --no-cache git tmux py2-pip apache2-utils vim build-base gettext-dev curl bash-completion bash util-linux jq
RUN apk add --no-cache git tmux py2-pip apache2-utils vim build-base gettext-dev curl bash-completion bash util-linux jq openssh
# Compile and install httping
@@ -19,9 +19,11 @@ RUN pip install docker-compose==${COMPOSE_VERSION}
RUN curl -L https://github.com/docker/machine/releases/download/${MACHINE_VERSION}/docker-machine-Linux-x86_64 \
-o /usr/bin/docker-machine && chmod +x /usr/bin/docker-machine
# Add bash completion
RUN mkdir /etc/bash_completion.d && curl https://raw.githubusercontent.com/docker/docker/master/contrib/completion/bash/docker -o /etc/bash_completion.d/docker
# Add bash completion and set bash as default shell
RUN mkdir /etc/bash_completion.d \
&& curl https://raw.githubusercontent.com/docker/cli/master/contrib/completion/bash/docker -o /etc/bash_completion.d/docker \
&& sed -i "s/ash/bash/" /etc/passwd
# Replace modprobe with a no-op to get rid of spurious warnings
# (note: we can't just symlink to /bin/true because it might be busybox)
RUN rm /sbin/modprobe && echo '#!/bin/true' >/sbin/modprobe && chmod +x /sbin/modprobe
@@ -51,6 +53,8 @@ CMD cat /etc/hosts >/etc/hosts.bak && \
sed -i "s/\DOCKER_TLSCERT/$DOCKER_TLSCERT/" /etc/docker/daemon.json && \
sed -i "s/\DOCKER_TLSKEY/$DOCKER_TLSKEY/" /etc/docker/daemon.json && \
umount /var/lib/docker && mount -t securityfs none /sys/kernel/security && \
echo "root:root" | chpasswd &> /dev/null && ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null && \
/usr/sbin/sshd -o PermitRootLogin=yes -o PrintMotd=no 2>/dev/null && \
dockerd &>/docker.log & \
while true ; do script -q -c "/bin/bash -l" /dev/null ; done
# ... and then put a shell in the foreground, restarting it if it exits

2
api.go
View File

@@ -111,6 +111,8 @@ func main() {
log.Fatal(httpServer.ListenAndServe())
}()
go handlers.ListenSSHProxy("0.0.0.0:1022")
// Now listen for TLS connections that need to be proxied
handlers.StartTLSProxy(config.SSLPortNumber)
}

8
docker-compose.yml
View File

@@ -15,7 +15,7 @@ services:
# use the latest golang image
image: golang
# go to the right place and starts the app
command: /bin/sh -c 'cd /go/src/github.com/play-with-docker/play-with-docker; go run api.go -save /pwd/sessions1 -name pwd1 -cname host1'
command: /bin/sh -c 'ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null; cd /go/src/github.com/play-with-docker/play-with-docker; go run api.go -save /pwd/sessions1 -name pwd1 -cname host1'
volumes:
# since this app creates networks and launches containers, we need to talk to docker daemon
- /var/run/docker.sock:/var/run/docker.sock
@@ -24,13 +24,15 @@ services:
- sessions:/pwd
environment:
GOOGLE_RECAPTCHA_DISABLED: "true"
ports:
- "1022:1022"
pwd2:
# pwd daemon container always needs to be named this way
container_name: pwd2
# use the latest golang image
image: golang
# go to the right place and starts the app
command: /bin/sh -c 'cd /go/src/github.com/play-with-docker/play-with-docker; go run api.go -save /pwd/sessions2 -name pwd2 -cname host2'
command: /bin/sh -c 'ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null; cd /go/src/github.com/play-with-docker/play-with-docker; go run api.go -save /pwd/sessions2 -name pwd2 -cname host2'
volumes:
# since this app creates networks and launches containers, we need to talk to docker daemon
- /var/run/docker.sock:/var/run/docker.sock
@@ -39,6 +41,8 @@ services:
- sessions:/pwd
environment:
GOOGLE_RECAPTCHA_DISABLED: "true"
ports:
- "1023:1022"
prometheus:
container_name: prometheus
image: prom/prometheus

206
handlers/sshproxy.go Normal file
View File

@@ -0,0 +1,206 @@
package handlers
import (
"fmt"
"io"
"io/ioutil"
"log"
"net"
"strings"
"sync"
"golang.org/x/crypto/ssh"
)
var sshConfig = &ssh.ServerConfig{
PublicKeyCallback: func(c ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
user := c.User()
chunks := strings.Split(user, "-")
ip := strings.Join(chunks[:4], ".")
sessionPrefix := chunks[4]
log.Println(ip, sessionPrefix)
return nil, nil
},
}
func ListenSSHProxy(laddr string) {
privateBytes, err := ioutil.ReadFile("/etc/ssh/ssh_host_rsa_key")
if err != nil {
log.Fatal("Failed to load private key: ", err)
}
private, err := ssh.ParsePrivateKey(privateBytes)
if err != nil {
log.Fatal("Failed to parse private key: ", err)
}
sshConfig.AddHostKey(private)
listener, err := net.Listen("tcp", laddr)
if err != nil {
log.Fatal("failed to listen for connection: ", err)
}
for {
nConn, err := listener.Accept()
if err != nil {
log.Fatal("failed to accept incoming connection: ", err)
}
go handle(nConn)
}
}
func handle(c net.Conn) {
sshCon, chans, reqs, err := ssh.NewServerConn(c, sshConfig)
if err != nil {
c.Close()
return
}
user := sshCon.User()
chunks := strings.Split(user, "-")
ip := strings.Join(chunks[:4], ".")
sessionPrefix := chunks[4]
i := core.InstanceFindByIPAndSession(sessionPrefix, ip)
if i == nil {
log.Printf("Couldn't find instance with ip [%s] in session [%s]\n", ip, sessionPrefix)
c.Close()
return
}
// The incoming Request channel must be serviced.
go ssh.DiscardRequests(reqs)
newChannel := <-chans
if newChannel == nil {
sshCon.Close()
return
}
if newChannel.ChannelType() != "session" {
newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
return
}
channel, requests, err := newChannel.Accept()
if err != nil {
log.Fatalf("Could not accept channel: %v", err)
}
stderr := channel.Stderr()
fmt.Fprintf(stderr, "Connecting to %s\r\n", ip)
clientConfig := &ssh.ClientConfig{
User: "root",
Auth: []ssh.AuthMethod{
ssh.Password("root"),
},
HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error {
return nil
},
}
client, err := ssh.Dial("tcp", fmt.Sprintf("%s:22", ip), clientConfig)
if err != nil {
fmt.Fprintf(stderr, "Connect failed: %v\r\n", err)
channel.Close()
return
}
go func() {
for newChannel = range chans {
if newChannel == nil {
return
}
channel2, reqs2, err := client.OpenChannel(newChannel.ChannelType(), newChannel.ExtraData())
if err != nil {
x, ok := err.(*ssh.OpenChannelError)
if ok {
newChannel.Reject(x.Reason, x.Message)
} else {
newChannel.Reject(ssh.Prohibited, "remote server denied channel request")
}
continue
}
channel, reqs, err := newChannel.Accept()
if err != nil {
channel2.Close()
continue
}
go proxy(reqs, reqs2, channel, channel2)
}
}()
// Forward the session channel
channel2, reqs2, err := client.OpenChannel("session", []byte{})
if err != nil {
fmt.Fprintf(stderr, "Remote session setup failed: %v\r\n", err)
channel.Close()
return
}
maskedReqs := make(chan *ssh.Request, 1)
go func() {
for req := range requests {
if req.Type == "auth-agent-req@openssh.com" {
continue
}
maskedReqs <- req
}
}()
proxy(maskedReqs, reqs2, channel, channel2)
}
func proxy(reqs1, reqs2 <-chan *ssh.Request, channel1, channel2 ssh.Channel) {
var closer sync.Once
closeFunc := func() {
channel1.Close()
channel2.Close()
}
defer closer.Do(closeFunc)
closerChan := make(chan bool, 1)
go func() {
io.Copy(channel1, channel2)
closerChan <- true
}()
go func() {
io.Copy(channel2, channel1)
closerChan <- true
}()
for {
select {
case req := <-reqs1:
if req == nil {
return
}
b, err := channel2.SendRequest(req.Type, req.WantReply, req.Payload)
if err != nil {
return
}
req.Reply(b, nil)
case req := <-reqs2:
if req == nil {
return
}
b, err := channel1.SendRequest(req.Type, req.WantReply, req.Payload)
if err != nil {
return
}
req.Reply(b, nil)
case <-closerChan:
return
}
}
}

14
pwd/instance.go
View File

@@ -150,6 +150,20 @@ func (p *pwd) InstanceFindByIP(ip string) *Instance {
return nil
}
func (p *pwd) InstanceFindByIPAndSession(sessionPrefix, ip string) *Instance {
defer observeAction("InstanceFindByIPAndSession", time.Now())
for id, s := range sessions {
if strings.HasPrefix(id, sessionPrefix) {
for _, i := range s.Instances {
if i.IP == ip {
return i
}
}
}
}
return nil
}
func (p *pwd) InstanceFindByAlias(sessionPrefix, alias string) *Instance {
defer observeAction("InstanceFindByAlias", time.Now())
for id, s := range sessions {

1
pwd/pwd.go
View File

@@ -68,6 +68,7 @@ type PWDApi interface {
InstanceGet(session *Session, name string) *Instance
InstanceFindByIP(ip string) *Instance
InstanceFindByAlias(sessionPrefix, alias string) *Instance
InstanceFindByIPAndSession(sessionPrefix, ip string) *Instance
InstanceDelete(session *Session, instance *Instance) error
InstanceWriteToTerminal(instance *Instance, data string)
InstanceAllowedImages() []string