feat: add home page

This commit is contained in:
Jon Lundy 2023-03-27 15:29:04 -06:00
parent 536483b73f
commit e0b5fe07f0
Signed by untrusted user who does not match committer: xuu
GPG Key ID: C63E6D61F3035024
10 changed files with 275 additions and 64 deletions

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@ -18,7 +18,7 @@ For best results place this behind a TLS termination that has a wildcard certifi
on your local machine have a ssh private and public key available:
```sh
$ export LOCAL_PORT=3000; export PRIV_KEY=~/.ssh/id_ed25519; sh -c "$(shell http --form POST example.com:2222 pub=@$(PRIV_KEY).pub)"
$ export LOCAL_PORT=3000; export PRIV_KEY=~/.ssh/id_ed25519; sh -c "$(shell http --form POST :2222 pub=@$(PRIV_KEY).pub)"
```
This will setup a reverse proxy on the example host that you can then use to access the local port. It will print a name unique to your ssh key.

6
assets/bootstrap.min.css vendored Normal file

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58
assets/sshfwd.css Normal file
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@ -0,0 +1,58 @@
/* Space out content a bit */
body {
padding-top: 20px;
padding-bottom: 20px;
}
/* Everything but the jumbotron gets side spacing for mobile first views */
.header,
.footer {
padding-right: 15px;
padding-left: 15px;
}
/* Custom page header */
.header {
padding-bottom: 20px;
border-bottom: 1px solid #e5e5e5;
}
/* Make the masthead heading the same height as the navigation */
.header h3 {
margin-top: 0;
margin-bottom: 0;
line-height: 40px;
}
/* Custom page footer */
.footer {
padding-top: 19px;
color: #777;
border-top: 1px solid #e5e5e5;
}
.panel-heading a {
color: white;
font-weight: bold;
}
.container-narrow > hr {
margin: 30px 0;
}
.table tbody tr th {
width: 70%
}
@media (prefers-color-scheme: dark) {
body, .panel-body {
color: white;
background-color: #121212;
}
.table-striped > tbody > tr:nth-of-type(2n+1) {
background-color: darkslategray;
}
}
@media (prefers-color-scheme: light) {
}

19
go.mod
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@ -1,14 +1,19 @@
module github.com/jonlundy/sshfwd
go 1.15
go 1.18
require (
github.com/gliderlabs/ssh v0.3.2
github.com/soheilhy/cmux v0.1.5
github.com/wolfeidau/humanhash v1.1.0
go.uber.org/multierr v1.7.0
)
require (
github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be // indirect
github.com/gliderlabs/ssh v0.3.2
github.com/soheilhy/cmux v0.1.5
github.com/tjarratt/babble v0.0.0-20210505082055-cbca2a4833c1
github.com/wolfeidau/humanhash v1.1.0 // indirect
go.uber.org/multierr v1.7.0
golang.org/dl v0.0.0-20210816190658-eea66df5a73d // indirect
go.uber.org/atomic v1.7.0 // indirect
golang.org/x/crypto v0.0.0-20210506145944-38f3c27a63bf // indirect
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirect
golang.org/x/text v0.3.3 // indirect
)

8
go.sum
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@ -1,25 +1,24 @@
github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/gliderlabs/ssh v0.3.2 h1:gcfd1Aj/9RQxvygu4l3sak711f/5+VOwBw9C/7+N4EI=
github.com/gliderlabs/ssh v0.3.2/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/soheilhy/cmux v0.1.5 h1:jjzc5WVemNEDTLwv9tlmemhC73tI08BNOIGwBOo10Js=
github.com/soheilhy/cmux v0.1.5/go.mod h1:T7TcVDs9LWfQgPlPsdngu6I6QIoyIFZDDC6sNE1GqG0=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/tjarratt/babble v0.0.0-20210505082055-cbca2a4833c1 h1:j8whCiEmvLCXI3scVn+YnklCU8mwJ9ZJ4/DGAKqQbRE=
github.com/tjarratt/babble v0.0.0-20210505082055-cbca2a4833c1/go.mod h1:O5hBrCGqzfb+8WyY8ico2AyQau7XQwAfEQeEQ5/5V9E=
github.com/wolfeidau/humanhash v1.1.0 h1:06KgtyyABJGBbrfMONrW7S+b5TTYVyrNB/jss5n7F3E=
github.com/wolfeidau/humanhash v1.1.0/go.mod h1:jkpynR1bfyfkmKEQudIC0osWKynFAoayRjzH9OJdVIg=
go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
go.uber.org/multierr v1.7.0 h1:zaiO/rmgFjbmCXdSYJWQcdvOCsthmdaHfr3Gm2Kx4Ec=
go.uber.org/multierr v1.7.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=
golang.org/dl v0.0.0-20210816190658-eea66df5a73d h1:fY+sw1TVAhVSrszhxX7Ew04Y6V9Znfa8s5O1HTzTsOQ=
golang.org/dl v0.0.0-20210816190658-eea66df5a73d/go.mod h1:IUMfjQLJQd4UTqG1Z90tenwKoCX93Gn3MAQJMOSBsDQ=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20210506145944-38f3c27a63bf h1:B2n+Zi5QeYRDAEodEu72OS36gmTWjgpXr2+cWcBW90o=
@ -41,4 +40,5 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

33
layouts/main.go.tpl Normal file
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@ -0,0 +1,33 @@
{{define "main"}}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
{{template "meta" .}}
<title>SSH Fwd</title>
<link href="/assets/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<link href="/assets/sshfwd.css" rel="stylesheet" crossorigin="anonymous">
</head>
<body>
<div class="container-fluid">
<div class="header clearfix">
<nav>
<ul class="nav nav-pills pull-right">
<li role="presentation"><a href="/">Home</a></li>
</ul>
</nav>
<h3 class="text-muted">SSH Fwd</h3>
</div>
</div>
<div class=container>
{{template "content" .}}
</div>
</body>
</html>
{{end}}

View File

@ -2,7 +2,6 @@ package main
import (
"context"
"io/ioutil"
"log"
"net"
"net/http"
@ -44,7 +43,7 @@ func run(ctx context.Context) {
)
hostKeys := envMust("SSH_HOSTKEYS")
files, err := ioutil.ReadDir(hostKeys)
files, err := os.ReadDir(hostKeys)
if err != nil {
log.Fatal(err)
}
@ -52,6 +51,8 @@ func run(ctx context.Context) {
opts = append(opts, ssh.HostKeyFile(filepath.Join(hostKeys, f.Name())))
}
loadTemplates()
srv := &server{
bindHost: envDefault("SSH_HOST", bindHost),
domainName: envDefault("SSH_DOMAIN", domainName),

61
pages/home.go.tpl Normal file
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@ -0,0 +1,61 @@
{{template "main" .}}
{{define "meta"}}
<meta http-equiv="refresh" content="30">
{{end}}
{{define "content"}}
<h2>What is this?</h2>
<p>This is a reverse proxy service that uses SSH as the transport. It works similar to ngrok or localtunnel.me.</p>
<p>
You run the service on a internet addressible host and ssh to it. Using ssh remote forwards (ie. ssh -R) the port
on the remote host will be forwared to the configured port on your local machine.
</p>
<h2>How does it work?</h2>
<p>
<ol>
<li>You add your SSH public key</li>
<li>Connect to SSH</li>
<li>???</li>
<li>Profit!</li>
</ol>
</p>
<form class="form-inline" method="POST" action="/peers/req">
<label>SSH Public Key:</label>
<div class="input-group input-group-sm">
<input class="form-control" type="text" name="pub" placeholder="ssh-key ...">
</div>
<button class="btn btn-default" type="submit">Submit</button>
</form>
<div class=row>
<h2>Connections</h2>
{{ with $args := . }}
{{ range $user := .Users }}
<div class="panel panel-primary">
<div class="panel-heading">
<a href="/user/{{ $user.Name }}">
{{ $user.Name }}
</a>
<div style='float:right'>
{{ if $user.Active }}
<a href="/user/{{ $user.Name }}" class='btn btn-success'>Active</a>
{{ else }}
<a href="/user/{{ $user.Name }}" class='btn btn-danger'>Disconnected</a>
{{ end }}
</div>
</div>
<div class="panel-body">
<pre>ssh -T -p {{ $args.ListenPort }} {{ $user.Name }}@{{ $args.DomainName }} -R "{{ $user.BindPort }}:localhost:$LOCAL_PORT" -i $PRIV_KEY</pre>
</div>
</div>
{{ end }}
</div>
{{ end }}
{{ end }}

146
server.go
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@ -3,38 +3,49 @@ package main
import (
"context"
"crypto/sha256"
"embed"
"fmt"
"io/fs"
"log"
"net"
"net/http"
"net/http/httputil"
"strings"
"sync"
"text/template"
"time"
"github.com/gliderlabs/ssh"
"github.com/wolfeidau/humanhash"
)
var (
//go:embed pages/* layouts/* assets/*
files embed.FS
templates map[string]*template.Template
)
type user struct {
name string
pubkey ssh.PublicKey
bindHost string
bindPort uint32
Name string
Pubkey ssh.PublicKey
BindHost string
BindPort uint32
ctx ssh.Context
proxy http.Handler
lastLogin time.Time
LastLogin time.Time
}
func (u *user) Active() bool { return u.ctx != nil }
func (u *user) String() string {
var b strings.Builder
fmt.Fprintln(&b, "User: ", u.name)
fmt.Fprintln(&b, "User: ", u.Name)
fmt.Fprintf(&b, " Ptr: %p\n", u)
fmt.Fprintf(&b, " Pubkey: %x\n", u.pubkey)
fmt.Fprintln(&b, " Host: ", u.bindHost)
fmt.Fprintln(&b, " Port: ", u.bindPort)
fmt.Fprintf(&b, " Pubkey: %x\n", u.Pubkey)
fmt.Fprintln(&b, " Host: ", u.BindHost)
fmt.Fprintln(&b, " Port: ", u.BindPort)
fmt.Fprintf(&b, " Active: %t\n", u.ctx != nil)
fmt.Fprintln(&b, " LastLog:", u.lastLogin)
fmt.Fprintln(&b, " LastLog:", u.LastLogin)
return b.String()
}
@ -67,19 +78,19 @@ func (s *server) String() string {
func (srv *server) addUser(pubkey ssh.PublicKey) *user {
u := &user{}
u.lastLogin = time.Now()
u.name = fingerprintHuman(pubkey)
u.name = strings.ToLower(u.name)
u.name = filterName.ReplaceAllString(u.name, "")
u.LastLogin = time.Now()
u.Name = fingerprintHuman(pubkey)
u.Name = strings.ToLower(u.Name)
u.Name = filterName.ReplaceAllString(u.Name, "")
if g, ok := srv.users.LoadOrStore(u.name, u); ok {
if g, ok := srv.users.LoadOrStore(u.Name, u); ok {
u = g.(*user)
return u
}
u.pubkey = pubkey
u.bindPort = srv.nextPort()
u.bindHost = srv.bindHost
u.Pubkey = pubkey
u.BindPort = srv.nextPort()
u.BindHost = srv.bindHost
return u
}
@ -87,7 +98,7 @@ func (srv *server) disconnectUser(name string) {
if u, ok := srv.getUserByName(name); ok {
u.ctx = nil
u.proxy = nil
srv.ports.Delete(u.bindPort)
srv.ports.Delete(u.BindPort)
}
}
func (srv *server) getUserByPort(port uint32) (*user, bool) {
@ -121,18 +132,6 @@ func (srv *server) listUsers() []*user {
return lis
}
func (srv *server) listConnectedUsers() []*user {
var lis []*user
srv.ports.Range(func(key, value interface{}) bool {
if u, ok := value.(*user); ok {
lis = append(lis, u)
return true
}
return false
})
return lis
}
func (srv *server) nextPort() uint32 {
if srv.portNext < srv.portStart || srv.portNext > srv.portEnd {
srv.portNext = srv.portStart
@ -160,7 +159,7 @@ func (srv *server) newSession(ctx context.Context) func(ssh.Session) {
}
if u, ok := srv.getUserByName(s.User()); ok {
host := fmt.Sprintf("%v:%v", u.bindHost, u.bindPort)
host := fmt.Sprintf("%v:%v", u.BindHost, u.BindPort)
director := func(req *http.Request) {
if h := req.Header.Get("X-Forwarded-Host"); h == "" {
req.Header.Set("X-Forwarded-Host", req.Host)
@ -176,7 +175,7 @@ func (srv *server) newSession(ctx context.Context) func(ssh.Session) {
fmt.Fprintln(s, string(requestDump))
}
u.proxy = &httputil.ReverseProxy{Director: director}
fmt.Fprintf(s, "Created HTTP listener at: %v%v\n\n", u.name, srv.domainSuffix)
fmt.Fprintf(s, "Created HTTP listener at: %v%v\n\n", u.Name, srv.domainSuffix)
}
select {
@ -201,11 +200,11 @@ func (srv *server) optAuthUser() []ssh.Option {
return false
}
if ssh.KeysEqual(key, u.pubkey) {
log.Println("User:", ctx.User(), "Authorized:", u.bindHost, u.bindPort, ctx.ClientVersion(), ctx.SessionID(), ctx.LocalAddr(), ctx.RemoteAddr())
if ssh.KeysEqual(key, u.Pubkey) {
log.Println("User:", ctx.User(), "Authorized:", u.BindHost, u.BindPort, ctx.ClientVersion(), ctx.SessionID(), ctx.LocalAddr(), ctx.RemoteAddr())
u.ctx = ctx
u.lastLogin = time.Now()
if _, loaded := srv.ports.LoadOrStore(u.bindPort, u); loaded {
u.LastLogin = time.Now()
if _, loaded := srv.ports.LoadOrStore(u.BindPort, u); loaded {
log.Println("User:", ctx.User(), "already connected!")
return false
}
@ -232,11 +231,11 @@ func (srv *server) optAuthUser() []ssh.Option {
}
if u.ctx.SessionID() != ctx.SessionID() {
log.Println("Port", bindPort, "in use by", u.name, u.ctx.SessionID())
log.Println("Port", bindPort, "in use by", u.Name, u.ctx.SessionID())
return false
}
if bindHost != strings.Trim(u.bindHost, "[]") || bindPort != u.bindPort {
if bindHost != strings.Trim(u.BindHost, "[]") || bindPort != u.BindPort {
log.Println("User", ctx.User(), "Not Allowed: ", bindHost, bindPort, ctx.ClientVersion(), ctx.SessionID(), ctx.LocalAddr(), ctx.RemoteAddr())
return false
}
@ -282,25 +281,43 @@ func (srv *server) handleHTTP(rw http.ResponseWriter, r *http.Request) {
pubkey, _, _, _, err := ssh.ParseAuthorizedKey([]byte(r.FormValue("pub")))
if err != nil {
rw.WriteHeader(400)
fmt.Fprintln(rw, "ERR READING KEY")
fmt.Fprintln(rw, "ERR READING KEY", err)
return
}
u := srv.addUser(pubkey)
rw.WriteHeader(201)
fmt.Fprintf(rw, `ssh -T -p %v %v@%v -R "%v:%v:localhost:$LOCAL_PORT" -i $PRIV_KEY`+"\n", srv.listenPort, u.name, srv.domainName, u.bindHost, u.bindPort)
rw.Header().Set("Location", "/")
rw.WriteHeader(http.StatusFound)
fmt.Fprintf(rw, `ssh -T -p %v %v@%v -R "%v:%v:localhost:$LOCAL_PORT" -i $PRIV_KEY`+"\n", srv.listenPort, u.Name, srv.domainName, u.BindHost, u.BindPort)
return
}
fmt.Fprintln(rw, "Hello!")
fmt.Fprintln(rw, srv)
fmt.Fprintln(rw, "Registered Users")
for _, u := range srv.listUsers() {
fmt.Fprintln(rw, u)
// fmt.Fprintln(rw, "Hello!")
// fmt.Fprintln(rw, srv)
// fmt.Fprintln(rw, "Registered Users")
// for _, u := range srv.listUsers() {
// fmt.Fprintln(rw, u)
// }
// fmt.Fprintln(rw, "Connected Users")
// for _, u := range srv.listConnectedUsers() {
// fmt.Fprintln(rw, u)
// }
a, _ := fs.Sub(files, "assets")
assets := http.StripPrefix("/assets/", http.FileServer(http.FS(a)))
if strings.HasPrefix(r.URL.Path, "/assets/") {
assets.ServeHTTP(rw, r)
return
}
fmt.Fprintln(rw, "Connected Users")
for _, u := range srv.listConnectedUsers() {
fmt.Fprintln(rw, u)
t := templates["home.go.tpl"]
err := t.Execute(rw, map[string]any{
"Users": srv.listUsers(),
"ListenPort": srv.listenPort,
"DomainName": srv.domainName,
})
if err != nil {
log.Println(err)
}
}
@ -309,3 +326,32 @@ func fingerprintHuman(pubKey ssh.PublicKey) string {
h, _ := humanhash.Humanize(sha256sum[:], 3)
return h
}
var funcMap = map[string]any{}
func loadTemplates() error {
if templates != nil {
return nil
}
templates = make(map[string]*template.Template)
tmplFiles, err := fs.ReadDir(files, "pages")
if err != nil {
return err
}
for _, tmpl := range tmplFiles {
if tmpl.IsDir() {
continue
}
pt := template.New(tmpl.Name())
pt.Funcs(funcMap)
pt, err = pt.ParseFS(files, "pages/"+tmpl.Name(), "layouts/*.go.tpl")
if err != nil {
log.Println(err)
return err
}
templates[tmpl.Name()] = pt
}
return nil
}