Implement support for implicit FTPS on port 990

docs/source/Reference/sr3_credentials.7.rst

@@ -47,6 +47,7 @@ passwords and settings needed by components.  The format is one entry per line.
 
 - **ftps://user7:De%3Aize@host  passive,binary,tls**
 - **ftps://user8:%2fdot8@host:2121  active,ascii,tls,prot_p**
+- **ftp://user8:%2fdot8@host:990  implicit_ftps**
 - **https://ladsweb.modaps.eosdis.nasa.gov/ bearer_token=89APCBF0-FEBE-11EA-A705-B0QR41911BF4**
 
 
@@ -71,6 +72,7 @@ Supported details:
 - ``prot_p`` - (FTPS) Use a secure data connection for TLS connections (otherwise, clear text is used)
 - ``bearer_token=<token>`` (or ``bt=<token>``) - (HTTP) Bearer token for authentication
 - ``login_method=<PLAIN|AMQPLAIN|EXTERNAL|GSSAPI>`` - (AMQP) By default, the login method will be automatically determined. This can be overriden by explicity specifying a login method, which may be required if a broker supports multiple methods and an incorrect one is automatically selected.
+- ``implicit_ftps`` - (FTPS) Use implicit FTPS (otherwise, explicit FTPS is used). Setting this will also set ``tls`` to True.
 
 Note::
  SFTP credentials are optional, in that sarracenia will look in the .ssh directory

docs/source/fr/Reference/sr3_credentials.7.rst

@@ -46,6 +46,7 @@ ainsi que les paramètres nécessaires aux composants.  Le format est d'une entr
 
 - **ftps://user7:De%3Aize@host  passive,binary,tls**
 - **ftps://user8:%2fdot8@host:2121  active,ascii,tls,prot_p**
+- **ftp://user8:%2fdot8@host:990  implicit_ftps**
 - **https://ladsweb.modaps.eosdis.nasa.gov/ bearer_token=89APCBF0-FEBE-11EA-A705-B0QR41911BF4**
 
 Dans d’autres fichiers de configuration ou sur la ligne de commande, l’url n’a tout simplement pas le
@@ -71,6 +72,7 @@ Détails pris en charge :
 - ``prot_p`` - (FTPS) Utiliser une connexion de données sécurisée pour les connexions TLS (sinon, du texte clair est utilisé)
 - ``bearer_token=<token>`` (ou ``bt=<token>``) - (HTTP) Jeton Bearer pour l’authentification
 - ``login_method=<PLAIN|AMQPLAIN|EXTERNAL|GSSAPI>`` - (AMQP) Par défaut, la méthode de connexion sera automatiquement
+- ``implicit_ftps`` - (FTPS) Utilisez FTPS implicite (sinon, FTPS explicite est utilisé). Définir ceci définira également ``tls`` sur True.
 
 déterminée. Cela peut être remplacé en spécifiant une méthode Particulière de connexion, ce qui peut être
 nécessaire si un broker prend en charge plusieurs méthodes et qu’une méthode incorrecte est automatiquement

sarracenia/credentials.py

@@ -66,6 +66,7 @@ class Credential:
         bearer_token (str): bearer token for HTTP authentication
         login_method (str): force a specific login method for AMQP (PLAIN,
             AMQPLAIN, EXTERNAL or GSSAPI)
+        implicit_ftps (bool): use implicit FTPS, defaults to ``False`` (i.e. explicit FTPS)
 
     Usage:
 
@@ -101,6 +102,7 @@ def __init__(self, urlstr=None):
         self.s3_endpoint = None
         self.s3_session_token = None
         self.azure_credentials = None
+        self.implicit_ftps = False
 
     def __str__(self):
         """Returns attributes of the Credential object as a readable string.
@@ -133,6 +135,7 @@ def __str__(self):
         #want to show they provided a session token, but not leak it (like passwords above)
         s += " %s" % 'Yes' if self.s3_session_token != None else 'No'
         s += " %s" % 'Yes' if self.azure_credentials != None else 'No'
+        s += " %s" % self.implicit_ftps
 
         return s
 
@@ -383,6 +386,9 @@ def _parse(self, line):
                     details.s3_endpoint = parts[1].strip()
                 elif keyword == 'azure_storage_credentials':
                     details.azure_credentials = urllib.parse.unquote(parts[1].strip())
+                elif keyword == 'implicit_ftps':
+                    details.implicit_ftps = True
+                    details.tls = True
                 else:
                     logger.warning("bad credential option (%s)" % keyword)
 

sarracenia/transfer/ftp.py

@@ -20,14 +20,34 @@
 #  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 #
 
-import ftplib, os, subprocess, sys, time
+import ftplib, os, subprocess, sys, time, ssl
 import logging
 from sarracenia.transfer import Transfer
 from sarracenia.transfer import alarm_cancel, alarm_set, alarm_raise
 from urllib.parse import unquote
 
 logger = logging.getLogger(__name__)
 
+class IMPLICIT_FTP_TLS(ftplib.FTP_TLS):
+    """ FTP_TLS subclass that automatically wraps sockets in SSL to support implicit FTPS.
+        Copied from https://stackoverflow.com/questions/12164470/python-ftp-implicit-tls-connection-issue
+    """
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._sock = None
+
+    @property
+    def sock(self):
+        """Return the socket."""
+        return self._sock
+
+    @sock.setter
+    def sock(self, value):
+        """When modifying the socket, ensure that it is ssl wrapped."""
+        if value is not None and not isinstance(value, ssl.SSLSocket):
+            value = self.context.wrap_socket(value)
+        self._sock = value
 
 class Ftp(Transfer):
     """
@@ -176,13 +196,27 @@ def connect(self):
         try:
             expire = -999
             if self.o.timeout: expire = self.o.timeout
-            if self.port == '' or self.port == None: self.port = 21
+            if self.port == '' or self.port == None: 
+                if self.implicit_ftps:
+                    self.port = 990
+                else:
+                    self.port = 21
 
+            # plain FTP with no encryption (usually port 21)
             if not self.tls:
                 ftp = ftplib.FTP()
                 ftp.encoding = 'utf-8'
                 ftp.connect(self.host, self.port, timeout=expire)
                 ftp.login(self.user, unquote(self.password))
+            # implicit FTPS (usually port 990)
+            elif self.tls and self.implicit_ftps:
+                ftp = IMPLICIT_FTP_TLS()
+                ftp.encoding = 'utf-8'
+                ftp.connect(host=self.host, port=self.port, timeout=expire)
+                ftp.login(user=self.user, passwd=unquote(self.password))
+                if self.prot_p:
+                    ftp.prot_p()
+            # explicit FTPS (port 21)
             else:
                 # ftplib supports FTPS with TLS
                 ftp = ftplib.FTP_TLS(self.host,
@@ -233,6 +267,7 @@ def credentials(self):
             self.binary = details.binary
             self.tls = details.tls
             self.prot_p = details.prot_p
+            self.implicit_ftps = details.implicit_ftps
 
             return True