17170: Add "arvados-client shell" subcommand and backend support.

[arvados.git] / lib / controller / rpc / conn.go

diff --git a/lib/controller/rpc/conn.go b/lib/controller/rpc/conn.go
index cd98b64718a0b1f52702f4997f432d3d5210f353..e80542e3e1b43598d61aa06132ebaca2be6f44ba 100644 (file)
--- a/lib/controller/rpc/conn.go
+++ b/lib/controller/rpc/conn.go
@@ -5,6 +5,7 @@
 package rpc
 
 import (
+       "bufio"
        "bytes"
        "context"
        "crypto/tls"
@@ -12,6 +13,7 @@ import (
        "errors"
        "fmt"
        "io"
+       "io/ioutil"
        "net"
        "net/http"
        "net/url"
@@ -21,6 +23,7 @@ import (
 
        "git.arvados.org/arvados.git/sdk/go/arvados"
        "git.arvados.org/arvados.git/sdk/go/auth"
+       "git.arvados.org/arvados.git/sdk/go/httpserver"
 )
 
 type TokenProvider func(context.Context) ([]string, error)
@@ -286,6 +289,61 @@ func (conn *Conn) ContainerUnlock(ctx context.Context, options arvados.GetOption
        return resp, err
 }
 
+// ContainerSSH returns a connection to the out-of-band SSH server for
+// a running container. If the returned error is nil, the caller is
+// responsible for closing sshconn.Conn.
+func (conn *Conn) ContainerSSH(ctx context.Context, options arvados.ContainerSSHOptions) (sshconn arvados.ContainerSSHConnection, err error) {
+       netconn, err := tls.Dial("tcp", net.JoinHostPort(conn.baseURL.Host, "https"), nil)
+       if err != nil {
+               return
+       }
+       bufr := bufio.NewReader(netconn)
+       bufw := bufio.NewWriter(netconn)
+
+       u, err := conn.baseURL.Parse("/" + strings.Replace(arvados.EndpointContainerSSH.Path, "{uuid}", options.UUID, -1))
+       if err != nil {
+               netconn.Close()
+               return
+       }
+       u.RawQuery = url.Values{"detach_keys": {options.DetachKeys}}.Encode()
+       tokens, err := conn.tokenProvider(ctx)
+       if err != nil {
+               netconn.Close()
+               return
+       } else if len(tokens) < 1 {
+               err = httpserver.ErrorWithStatus(errors.New("unauthorized"), http.StatusUnauthorized)
+               netconn.Close()
+               return
+       }
+       bufw.WriteString("GET " + u.String() + " HTTP/1.1\r\n")
+       bufw.WriteString("Authorization: Bearer " + tokens[0] + "\r\n")
+       bufw.WriteString("Host: " + u.Host + "\r\n")
+       bufw.WriteString("Upgrade: ssh\r\n")
+       bufw.WriteString("\r\n")
+       bufw.Flush()
+       resp, err := http.ReadResponse(bufr, &http.Request{Method: "GET"})
+       if err != nil {
+               netconn.Close()
+               return
+       }
+       if resp.StatusCode != http.StatusSwitchingProtocols {
+               defer resp.Body.Close()
+               body, _ := ioutil.ReadAll(resp.Body)
+               err = fmt.Errorf("tunnel connection failed: %d %q", resp.StatusCode, body)
+               netconn.Close()
+               return
+       }
+       if strings.ToLower(resp.Header.Get("Upgrade")) != "ssh" ||
+               strings.ToLower(resp.Header.Get("Connection")) != "upgrade" {
+               err = fmt.Errorf("bad response: Upgrade %q Connection %q", resp.Header.Get("Upgrade"), resp.Header.Get("Connection"))
+               netconn.Close()
+               return
+       }
+       sshconn.Conn = netconn
+       sshconn.Bufrw = &bufio.ReadWriter{Reader: bufr, Writer: bufw}
+       return
+}
+
 func (conn *Conn) SpecimenCreate(ctx context.Context, options arvados.CreateOptions) (arvados.Specimen, error) {
        ep := arvados.EndpointSpecimenCreate
        var resp arvados.Specimen