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Attempt 2 revert changes from ssh

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This commit is contained in:
lash 2024-09-26 15:08:15 +01:00
parent d7dc743fa2
commit 4ee241714b
Signed by: lash
GPG Key ID: 21D2E7BB88C2A746
5 changed files with 0 additions and 541 deletions
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34
cmd/ssh/README.md
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@ -1,34 +0,0 @@
# URDT-USSD SSH server
An SSH server entry point for the vise engine.
## Adding public keys for access
Map your (client) public key to a session identifier (e.g. phone number)
```
go run -v -tags logtrace ./cmd/ssh/sshkey/main.go -i <session_id> [--dbdir <dbpath>] <client_publickey_filepath>
```
## Create a private key for the server
```
ssh-keygen -N "" -f <server_privatekey_filepath>
```
## Run the server
```
go run -v -tags logtrace ./cmd/ssh/main.go -h <host> -p <port> [--dbdir <dbpath>] <server_privatekey_filepath>
```
## Connect to the server
```
ssh [-v] -T -p <port> -i <client_publickey_filepath> <host>
```

115
cmd/ssh/main.go
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package main
import (
"context"
"flag"
"fmt"
"path"
"os"
"os/signal"
"sync"
"syscall"
"git.defalsify.org/vise.git/db"
"git.defalsify.org/vise.git/engine"
"git.defalsify.org/vise.git/logging"
"git.grassecon.net/urdt/ussd/internal/ssh"
)
var (
wg sync.WaitGroup
keyStore db.Db
logg = logging.NewVanilla()
scriptDir = path.Join("services", "registration")
)
func main() {
var dbDir string
var resourceDir string
var size uint
var engineDebug bool
var stateDebug bool
var host string
var port uint
flag.StringVar(&dbDir, "dbdir", ".state", "database dir to read from")
flag.StringVar(&resourceDir, "resourcedir", path.Join("services", "registration"), "resource dir")
flag.BoolVar(&engineDebug, "engine-debug", false, "use engine debug output")
flag.BoolVar(&stateDebug, "state-debug", false, "use engine debug output")
flag.UintVar(&size, "s", 160, "max size of output")
flag.StringVar(&host, "h", "127.0.0.1", "http host")
flag.UintVar(&port, "p", 7122, "http port")
flag.Parse()
sshKeyFile := flag.Arg(0)
_, err := os.Stat(sshKeyFile)
if err != nil {
fmt.Fprintf(os.Stderr, "cannot open ssh server private key file: %v\n", err)
os.Exit(1)
}
ctx := context.Background()
logg.WarnCtxf(ctx, "!!!!! WARNING WARNING WARNING")
logg.WarnCtxf(ctx, "!!!!! =======================")
logg.WarnCtxf(ctx, "!!!!! This is not a production ready server!")
logg.WarnCtxf(ctx, "!!!!! Do not expose to internet and only use with tunnel!")
logg.WarnCtxf(ctx, "!!!!! (See ssh -L <...>)")
logg.Infof("start command", "dbdir", dbDir, "resourcedir", resourceDir, "outputsize", size, "keyfile", sshKeyFile, "host", host, "port", port)
pfp := path.Join(scriptDir, "pp.csv")
cfg := engine.Config{
Root: "root",
OutputSize: uint32(size),
FlagCount: uint32(16),
}
if stateDebug {
cfg.StateDebug = true
}
if engineDebug {
cfg.EngineDebug = true
}
authKeyStore, err := ssh.NewSshKeyStore(ctx, dbDir)
if err != nil {
fmt.Fprintf(os.Stderr, "keystore file open error: %v", err)
os.Exit(1)
}
defer func () {
logg.TraceCtxf(ctx, "shutdown auth key store reached")
err = authKeyStore.Close()
if err != nil {
logg.ErrorCtxf(ctx, "keystore close error", "err", err)
}
}()
cint := make(chan os.Signal)
cterm := make(chan os.Signal)
signal.Notify(cint, os.Interrupt, syscall.SIGINT)
signal.Notify(cterm, os.Interrupt, syscall.SIGTERM)
runner := &ssh.SshRunner{
Cfg: cfg,
Debug: engineDebug,
FlagFile: pfp,
DbDir: dbDir,
ResourceDir: resourceDir,
SrvKeyFile: sshKeyFile,
Host: host,
Port: port,
}
go func() {
select {
case _ = <-cint:
case _ = <-cterm:
}
logg.TraceCtxf(ctx, "shutdown runner reached")
err := runner.Stop()
if err != nil {
logg.ErrorCtxf(ctx, "runner stop error", "err", err)
}
}()
runner.Run(ctx, authKeyStore)
}

44
cmd/ssh/sshkey/main.go
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@ -1,44 +0,0 @@
package main
import (
"context"
"flag"
"fmt"
"os"
"git.grassecon.net/urdt/ussd/internal/ssh"
)
func main() {
var dbDir string
var sessionId string
flag.StringVar(&dbDir, "dbdir", ".state", "database dir to read from")
flag.StringVar(&sessionId, "i", "", "session id")
flag.Parse()
if sessionId == "" {
fmt.Fprintf(os.Stderr, "empty session id\n")
os.Exit(1)
}
ctx := context.Background()
sshKeyFile := flag.Arg(0)
if sshKeyFile == "" {
fmt.Fprintf(os.Stderr, "missing key file argument\n")
os.Exit(1)
}
store, err := ssh.NewSshKeyStore(ctx, dbDir)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
defer store.Close()
err = store.AddFromFile(ctx, sshKeyFile, sessionId)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
}

64
internal/ssh/keystore.go
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@ -1,64 +0,0 @@
package ssh
import (
"context"
"fmt"
"os"
"path"
"golang.org/x/crypto/ssh"
"git.defalsify.org/vise.git/db"
"git.grassecon.net/urdt/ussd/internal/storage"
)
type SshKeyStore struct {
store db.Db
}
func NewSshKeyStore(ctx context.Context, dbDir string) (*SshKeyStore, error) {
keyStore := &SshKeyStore{}
keyStoreFile := path.Join(dbDir, "ssh_authorized_keys.gdbm")
keyStore.store = storage.NewThreadGdbmDb()
err := keyStore.store.Connect(ctx, keyStoreFile)
if err != nil {
return nil, err
}
return keyStore, nil
}
func(s *SshKeyStore) AddFromFile(ctx context.Context, fp string, sessionId string) error {
_, err := os.Stat(fp)
if err != nil {
return fmt.Errorf("cannot open ssh server public key file: %v\n", err)
}
publicBytes, err := os.ReadFile(fp)
if err != nil {
return fmt.Errorf("Failed to load public key: %v", err)
}
pubKey, _, _, _, err := ssh.ParseAuthorizedKey(publicBytes)
if err != nil {
return fmt.Errorf("Failed to parse public key: %v", err)
}
k := append([]byte{0x01}, pubKey.Marshal()...)
s.store.SetPrefix(storage.DATATYPE_CUSTOM)
logg.Infof("Added key", "sessionId", sessionId, "public key", string(publicBytes))
return s.store.Put(ctx, k, []byte(sessionId))
}
func(s *SshKeyStore) Get(ctx context.Context, pubKey ssh.PublicKey) (string, error) {
s.store.SetLanguage(nil)
s.store.SetPrefix(storage.DATATYPE_CUSTOM)
k := append([]byte{0x01}, pubKey.Marshal()...)
v, err := s.store.Get(ctx, k)
if err != nil {
return "", err
}
return string(v), nil
}
func(s *SshKeyStore) Close() error {
return s.store.Close()
}

284
internal/ssh/ssh.go
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@ -1,284 +0,0 @@
package ssh
import (
"context"
"encoding/hex"
"encoding/base64"
"errors"
"fmt"
"net"
"os"
"sync"
"golang.org/x/crypto/ssh"
"git.defalsify.org/vise.git/engine"
"git.defalsify.org/vise.git/logging"
"git.defalsify.org/vise.git/resource"
"git.defalsify.org/vise.git/state"
"git.grassecon.net/urdt/ussd/internal/handlers"
"git.grassecon.net/urdt/ussd/internal/storage"
)
var (
logg = logging.NewVanilla().WithDomain("ssh")
)
type auther struct {
Ctx context.Context
keyStore *SshKeyStore
auth map[string]string
}
func NewAuther(ctx context.Context, keyStore *SshKeyStore) *auther {
return &auther{
Ctx: ctx,
keyStore: keyStore,
auth: make(map[string]string),
}
}
func(a *auther) Check(conn ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
va, err := a.keyStore.Get(a.Ctx, pubKey)
if err != nil {
return nil, err
}
ka := hex.EncodeToString(conn.SessionID())
a.auth[ka] = va
fmt.Fprintf(os.Stderr, "connect: %s -> %s\n", ka, va)
return nil, nil
}
func(a *auther) FromConn(c *ssh.ServerConn) (string, error) {
if c == nil {
return "", errors.New("nil server conn")
}
if c.Conn == nil {
return "", errors.New("nil underlying conn")
}
return a.Get(c.Conn.SessionID())
}
func(a *auther) Get(k []byte) (string, error) {
ka := hex.EncodeToString(k)
v, ok := a.auth[ka]
if !ok {
return "", errors.New("not found")
}
return v, nil
}
func(s *SshRunner) serve(ctx context.Context, sessionId string, ch ssh.NewChannel, en engine.Engine) error {
if ch == nil {
return errors.New("nil channel")
}
if ch.ChannelType() != "session" {
ch.Reject(ssh.UnknownChannelType, "that is not the channel you are looking for")
return errors.New("not a session")
}
channel, requests, err := ch.Accept()
if err != nil {
panic(err)
}
defer channel.Close()
s.wg.Add(1)
go func(reqIn <-chan *ssh.Request) {
defer s.wg.Done()
for req := range reqIn {
req.Reply(req.Type == "shell", nil)
}
_ = requests
}(requests)
cont, err := en.Exec(ctx, []byte{})
if err != nil {
return fmt.Errorf("initial engine exec err: %v", err)
}
var input [state.INPUT_LIMIT]byte
for cont {
c, err := en.Flush(ctx, channel)
if err != nil {
return fmt.Errorf("flush err: %v", err)
}
_, err = channel.Write([]byte{0x0a})
if err != nil {
return fmt.Errorf("newline err: %v", err)
}
c, err = channel.Read(input[:])
if err != nil {
return fmt.Errorf("read input fail: %v", err)
}
logg.TraceCtxf(ctx, "input read", "c", c, "input", input[:c-1])
cont, err = en.Exec(ctx, input[:c-1])
if err != nil {
return fmt.Errorf("engine exec err: %v", err)
}
logg.TraceCtxf(ctx, "exec cont", "cont", cont, "en", en)
_ = c
}
c, err := en.Flush(ctx, channel)
if err != nil {
return fmt.Errorf("last flush err: %v", err)
}
_ = c
return nil
}
type SshRunner struct {
Ctx context.Context
Cfg engine.Config
FlagFile string
DbDir string
ResourceDir string
Debug bool
SrvKeyFile string
Host string
Port uint
wg sync.WaitGroup
lst net.Listener
}
func(s *SshRunner) Stop() error {
return s.lst.Close()
}
func(s *SshRunner) GetEngine(sessionId string) (engine.Engine, func(), error) {
ctx := s.Ctx
menuStorageService := storage.NewMenuStorageService(s.DbDir, s.ResourceDir)
err := menuStorageService.EnsureDbDir()
if err != nil {
return nil, nil, err
}
rs, err := menuStorageService.GetResource(ctx)
if err != nil {
return nil, nil, err
}
pe, err := menuStorageService.GetPersister(ctx)
if err != nil {
return nil, nil, err
}
userdatastore, err := menuStorageService.GetUserdataDb(ctx)
if err != nil {
return nil, nil, err
}
dbResource, ok := rs.(*resource.DbResource)
if !ok {
return nil, nil, err
}
lhs, err := handlers.NewLocalHandlerService(s.FlagFile, true, dbResource, s.Cfg, rs)
lhs.SetDataStore(&userdatastore)
lhs.SetPersister(pe)
lhs.Cfg.SessionId = sessionId
if err != nil {
return nil, nil, err
}
hl, err := lhs.GetHandler()
if err != nil {
return nil, nil, err
}
en := lhs.GetEngine()
en = en.WithFirst(hl.Init)
if s.Debug {
en = en.WithDebug(nil)
}
// TODO: this is getting very hacky!
closer := func() {
err := menuStorageService.Close()
if err != nil {
logg.ErrorCtxf(ctx, "menu storage service cleanup fail", "err", err)
}
}
return en, closer, nil
}
// adapted example from crypto/ssh package, NewServerConn doc
func(s *SshRunner) Run(ctx context.Context, keyStore *SshKeyStore) {
running := true
// TODO: waitgroup should probably not be global
defer s.wg.Wait()
auth := NewAuther(ctx, keyStore)
cfg := ssh.ServerConfig{
PublicKeyCallback: auth.Check,
}
privateBytes, err := os.ReadFile(s.SrvKeyFile)
if err != nil {
logg.ErrorCtxf(ctx, "Failed to load private key", "err", err)
}
private, err := ssh.ParsePrivateKey(privateBytes)
if err != nil {
logg.ErrorCtxf(ctx, "Failed to parse private key", "err", err)
}
srvPub := private.PublicKey()
srvPubStr := base64.StdEncoding.EncodeToString(srvPub.Marshal())
logg.InfoCtxf(ctx, "have server key", "type", srvPub.Type(), "public", srvPubStr)
cfg.AddHostKey(private)
s.lst, err = net.Listen("tcp", fmt.Sprintf("%s:%d", s.Host, s.Port))
if err != nil {
panic(err)
}
for running {
conn, err := s.lst.Accept()
if err != nil {
logg.ErrorCtxf(ctx, "ssh accept error", "err", err)
running = false
continue
}
go func(conn net.Conn) {
defer conn.Close()
for true {
srvConn, nC, rC, err := ssh.NewServerConn(conn, &cfg)
if err != nil {
logg.InfoCtxf(ctx, "rejected client", "err", err)
return
}
logg.DebugCtxf(ctx, "ssh client connected", "conn", srvConn)
s.wg.Add(1)
go func() {
ssh.DiscardRequests(rC)
s.wg.Done()
}()
sessionId, err := auth.FromConn(srvConn)
if err != nil {
logg.ErrorCtxf(ctx, "Cannot find authentication")
return
}
en, closer, err := s.GetEngine(sessionId)
if err != nil {
logg.ErrorCtxf(ctx, "engine won't start", "err", err)
return
}
defer func() {
err := en.Finish()
if err != nil {
logg.ErrorCtxf(ctx, "engine won't stop", "err", err)
}
closer()
}()
for ch := range nC {
err = s.serve(ctx, sessionId, ch, en)
logg.ErrorCtxf(ctx, "ssh server finish", "err", err)
}
}
}(conn)
}
}