From 669b249ca6eeb864fd1e24d3ec8e1c1ee9e8d557 Mon Sep 17 00:00:00 2001 From: Ayman Bagabas Date: Wed, 29 Nov 2023 17:45:21 -0500 Subject: [PATCH] feat: allocate real pty This fills the gap of allocating a real PTY when a session asks for one. It uses [go-pty](https://github.com/aymanbagabas/go-pty) to support PTYs for both Unix and Windows OSs. It also adds two new PtyCallback options, `AllocatePty` opens a new PTY for the session when requested. `EmulatePty` preserves the current behavior of the library. Signed-off-by: Ayman Bagabas --- go.mod | 4 +- go.sum | 374 ++++++++++++++++++++++++++++++++++++++++++++++++++++- options.go | 24 ++++ pty.go | 22 ++++ session.go | 23 +++- ssh.go | 9 ++ 6 files changed, 447 insertions(+), 9 deletions(-) diff --git a/go.mod b/go.mod index 0190739..569eb1e 100644 --- a/go.mod +++ b/go.mod @@ -4,6 +4,6 @@ go 1.12 require ( github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be - golang.org/x/crypto v0.0.0-20220826181053-bd7e27e6170d - golang.org/x/term v0.5.0 // indirect + github.com/aymanbagabas/go-pty v0.2.0 + golang.org/x/crypto v0.14.0 ) diff --git a/go.sum b/go.sum index 2baaea8..db21e13 100644 --- a/go.sum +++ b/go.sum @@ -1,15 +1,379 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/ProtonMail/go-crypto 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+++ b/options.go @@ -82,3 +82,27 @@ func WrapConn(fn ConnCallback) Option { return nil } } + +// EmulatePty returns a functional option that sets PtyCallback on the server +// to emulate a "fake" PTY by using PtyWriter. +func EmulatePty() Option { + return func(srv *Server) error { + srv.PtyCallback = func(_ Context, pty Pty) bool { + pty.emulate = true + return true + } + return nil + } +} + +// AllocatePty returns a functional option that sets PtyCallback on the server +// to allocate a PTY for sessions that request it. +func AllocatePty() Option { + return func(srv *Server) error { + srv.PtyCallback = func(_ Context, pty Pty) bool { + err := pty.allocate() + return err == nil + } + return nil + } +} diff --git a/pty.go b/pty.go index 6d54a20..a5d229c 100644 --- a/pty.go +++ b/pty.go @@ -3,6 +3,8 @@ package ssh import ( "bytes" "io" + + "github.com/aymanbagabas/go-pty" ) // NewPtyWriter creates a writer that handles when the session has a active @@ -55,3 +57,23 @@ func (rw readWriterDelegate) Read(p []byte) (n int, err error) { func (rw readWriterDelegate) Write(p []byte) (n int, err error) { return rw.w.Write(p) } + +// allocate is a helper function to allocate a pty session. +// It returns a Pty object that can be used to run a command on a tty. +// If this fails, use NewPtyReadWriter to _emulate_ a tty. +func (p *Pty) allocate() error { + tty, err := pty.New() + if err != nil { + return err + } + + p.Pty = tty + + if err := pty.ApplyTerminalModes(int(tty.Fd()), + p.Window.Width, p.Window.Height, p.Modes, + ); err != nil { + return err + } + + return nil +} diff --git a/session.go b/session.go index aaa7b75..6ec5c4c 100644 --- a/session.go +++ b/session.go @@ -4,6 +4,7 @@ import ( "errors" "fmt" "io" + "log" "net" "sync" @@ -128,14 +129,14 @@ type session struct { } func (sess *session) Stderr() io.ReadWriter { - if sess.pty != nil { + if sess.pty != nil && sess.pty.emulate { return NewPtyReadWriter(sess.Channel.Stderr()) } return sess.Channel.Stderr() } func (sess *session) Write(p []byte) (int, error) { - if sess.pty != nil { + if sess.pty != nil && sess.pty.emulate { return NewPtyWriter(sess.Channel).Write(p) } return sess.Channel.Write(p) @@ -331,6 +332,21 @@ func (sess *session) handleRequests(reqs <-chan *gossh.Request) { continue } } + if err := ptyReq.allocate(); err != nil { + req.Reply(false, nil) + continue + } + if ptyReq.Pty != nil { + log.Printf("pty allocated: %s", ptyReq.Pty.Name()) + sess.env = append(sess.env, + fmt.Sprintf("TERM=%s", ptyReq.Term), + fmt.Sprintf("SSH_TTY=%s", ptyReq.Pty.Name()), + ) + // input to pty + go io.Copy(ptyReq.Pty, sess) // nolint: errcheck + // pty to output + go io.Copy(sess, ptyReq.Pty) // nolint: errcheck + } sess.pty = &ptyReq sess.winch = make(chan Window, 1) sess.winch <- ptyReq.Window @@ -348,6 +364,9 @@ func (sess *session) handleRequests(reqs <-chan *gossh.Request) { if ok { sess.pty.Window = win sess.winch <- win + if sess.pty.Pty != nil { + sess.pty.Pty.Resize(win.Width, win.Height) + } } req.Reply(ok, nil) case agentRequestType: diff --git a/ssh.go b/ssh.go index 7dc76b3..40c8116 100644 --- a/ssh.go +++ b/ssh.go @@ -4,6 +4,7 @@ import ( "crypto/subtle" "net" + "github.com/aymanbagabas/go-pty" gossh "golang.org/x/crypto/ssh" ) @@ -91,6 +92,14 @@ type Window struct { // Pty represents a PTY request and configuration. type Pty struct { + // If this is true, the server will emulate a "fake" Pty by using + // PtyWriter. + emulate bool + + // Pty is the actual pty allocated. It is nil if the request did not + // allocated a pty. + pty.Pty + // Term is the TERM environment variable value. Term string