Fix ssh connection - don't override the host and port of the http pool

Signed-off-by: aiordache <anca.iordache@docker.com>

docker/transport/sshconn.py

@@ -1,9 +1,9 @@
-import io
 import paramiko
 import requests.adapters
 import six
 import logging
 import os
+import signal
 import socket
 import subprocess
 
@@ -23,40 +23,6 @@ except ImportError:
 RecentlyUsedContainer = urllib3._collections.RecentlyUsedContainer
 
 
-def create_paramiko_client(base_url):
-    logging.getLogger("paramiko").setLevel(logging.WARNING)
-    ssh_client = paramiko.SSHClient()
-    base_url = six.moves.urllib_parse.urlparse(base_url)
-    ssh_params = {
-        "hostname": base_url.hostname,
-        "port": base_url.port,
-        "username": base_url.username
-        }
-    ssh_config_file = os.path.expanduser("~/.ssh/config")
-    if os.path.exists(ssh_config_file):
-        conf = paramiko.SSHConfig()
-        with open(ssh_config_file) as f:
-            conf.parse(f)
-        host_config = conf.lookup(base_url.hostname)
-        ssh_conf = host_config
-        if 'proxycommand' in host_config:
-            ssh_params["sock"] = paramiko.ProxyCommand(
-                ssh_conf['proxycommand']
-            )
-        if 'hostname' in host_config:
-            ssh_params['hostname'] = host_config['hostname']
-        if 'identityfile' in host_config:
-            ssh_params['key_filename'] = host_config['identityfile']
-        if base_url.port is None and 'port' in host_config:
-            ssh_params['port'] = ssh_conf['port']
-        if base_url.username is None and 'user' in host_config:
-            ssh_params['username'] = ssh_conf['user']
-
-    ssh_client.load_system_host_keys()
-    ssh_client.set_missing_host_key_policy(paramiko.WarningPolicy())
-    return ssh_client, ssh_params
-
-
 class SSHSocket(socket.socket):
     def __init__(self, host):
         super(SSHSocket, self).__init__(
@@ -80,7 +46,8 @@ class SSHSocket(socket.socket):
             ' '.join(args),
             shell=True,
             stdout=subprocess.PIPE,
-            stdin=subprocess.PIPE)
+            stdin=subprocess.PIPE,
+            preexec_fn=lambda: signal.signal(signal.SIGINT, signal.SIG_IGN))
 
     def _write(self, data):
         if not self.proc or self.proc.stdin.closed:
@@ -96,17 +63,18 @@ class SSHSocket(socket.socket):
     def send(self, data):
         return self._write(data)
 
-    def recv(self):
+    def recv(self, n):
         if not self.proc:
             raise Exception('SSH subprocess not initiated.'
                             'connect() must be called first.')
-        return self.proc.stdout.read()
+        return self.proc.stdout.read(n)
 
     def makefile(self, mode):
-        if not self.proc or self.proc.stdout.closed:
-            buf = io.BytesIO()
-            buf.write(b'\n\n')
-            return buf
+        if not self.proc:
+            self.connect()
+        if six.PY3:
+            self.proc.stdout.channel = self
+
         return self.proc.stdout
 
     def close(self):
@@ -124,7 +92,7 @@ class SSHConnection(httplib.HTTPConnection, object):
         )
         self.ssh_transport = ssh_transport
         self.timeout = timeout
-        self.host = host
+        self.ssh_host = host
 
     def connect(self):
         if self.ssh_transport:
@@ -132,7 +100,7 @@ class SSHConnection(httplib.HTTPConnection, object):
             sock.settimeout(self.timeout)
             sock.exec_command('docker system dial-stdio')
         else:
-            sock = SSHSocket(self.host)
+            sock = SSHSocket(self.ssh_host)
             sock.settimeout(self.timeout)
             sock.connect()
 
@@ -147,16 +115,16 @@ class SSHConnectionPool(urllib3.connectionpool.HTTPConnectionPool):
             'localhost', timeout=timeout, maxsize=maxsize
         )
         self.ssh_transport = None
+        self.timeout = timeout
         if ssh_client:
             self.ssh_transport = ssh_client.get_transport()
-        self.timeout = timeout
-        self.host = host
-        self.port = None
+        self.ssh_host = host
+        self.ssh_port = None
         if ':' in host:
-            self.host, self.port = host.split(':')
+            self.ssh_host, self.ssh_port = host.split(':')
 
     def _new_conn(self):
-        return SSHConnection(self.ssh_transport, self.timeout, self.host)
+        return SSHConnection(self.ssh_transport, self.timeout, self.ssh_host)
 
     # When re-using connections, urllib3 calls fileno() on our
     # SSH channel instance, quickly overloading our fd limit. To avoid this,
@@ -193,10 +161,10 @@ class SSHHTTPAdapter(BaseHTTPAdapter):
                  shell_out=True):
         self.ssh_client = None
         if not shell_out:
-            self.ssh_client, self.ssh_params = create_paramiko_client(base_url)
+            self._create_paramiko_client(base_url)
             self._connect()
-        base_url = base_url.lstrip('ssh://')
-        self.host = base_url
+
+        self.ssh_host = base_url.lstrip('ssh://')
         self.timeout = timeout
         self.max_pool_size = max_pool_size
         self.pools = RecentlyUsedContainer(
@@ -204,11 +172,48 @@ class SSHHTTPAdapter(BaseHTTPAdapter):
         )
         super(SSHHTTPAdapter, self).__init__()
 
+    def _create_paramiko_client(self, base_url):
+        logging.getLogger("paramiko").setLevel(logging.WARNING)
+        self.ssh_client = paramiko.SSHClient()
+        base_url = six.moves.urllib_parse.urlparse(base_url)
+        self.ssh_params = {
+            "hostname": base_url.hostname,
+            "port": base_url.port,
+            "username": base_url.username
+            }
+        ssh_config_file = os.path.expanduser("~/.ssh/config")
+        if os.path.exists(ssh_config_file):
+            conf = paramiko.SSHConfig()
+            with open(ssh_config_file) as f:
+                conf.parse(f)
+            host_config = conf.lookup(base_url.hostname)
+            self.ssh_conf = host_config
+            if 'proxycommand' in host_config:
+                self.ssh_params["sock"] = paramiko.ProxyCommand(
+                    self.ssh_conf['proxycommand']
+                )
+            if 'hostname' in host_config:
+                self.ssh_params['hostname'] = host_config['hostname']
+            if base_url.port is None and 'port' in host_config:
+                self.ssh_params['port'] = self.ssh_conf['port']
+            if base_url.username is None and 'user' in host_config:
+                self.ssh_params['username'] = self.ssh_conf['user']
+
+        self.ssh_client.load_system_host_keys()
+        self.ssh_client.set_missing_host_key_policy(paramiko.WarningPolicy())
+
     def _connect(self):
         if self.ssh_client:
             self.ssh_client.connect(**self.ssh_params)
 
     def get_connection(self, url, proxies=None):
+        if not self.ssh_client:
+            return SSHConnectionPool(
+                ssh_client=self.ssh_client,
+                timeout=self.timeout,
+                maxsize=self.max_pool_size,
+                host=self.ssh_host
+            )
         with self.pools.lock:
             pool = self.pools.get(url)
             if pool:
@@ -222,7 +227,7 @@ class SSHHTTPAdapter(BaseHTTPAdapter):
                 ssh_client=self.ssh_client,
                 timeout=self.timeout,
                 maxsize=self.max_pool_size,
-                host=self.host
+                host=self.ssh_host
             )
             self.pools[url] = pool
 

tests/Dockerfile-ssh-dind

@@ -10,7 +10,7 @@ RUN apk add --no-cache \
 RUN ssh-keygen -A
 
 # copy the test SSH config
-RUN echo "IgnoreUserKnownHosts yes" >> /etc/ssh/sshd_config && \
+RUN echo "IgnoreUserKnownHosts yes" > /etc/ssh/sshd_config && \
   echo "PubkeyAuthentication yes" >> /etc/ssh/sshd_config && \
   echo "PermitRootLogin yes" >> /etc/ssh/sshd_config