IMAP4_SSL, libgmail, GMail and corporate firewall/proxy

[BJ Swope]

Imap is not on port 443.  IIRC, it's late and I'm to lazy to even google it
right now, but it's port 143 isn't it.



On Wed, Feb 16, 2011 at 11:58 PM, Andrea Gavana <andrea.gavana at gmail.com>wrote:

> Hi All,
>
>    I apologize in advance if I'm going to write very stupid things,
> my expertise in http/socket/imap stuff is very close to zero. I'm
> using Python 2.6.5 on Windows XP SP3.
>
> I am trying to access my GMail account from my office, and it appears
> our company's firewall is blocking all SMTP/POP3/IMAP attempts or
> there is simply something I don't understand. My first try was to use
> imaplib as follows:
>
>
> import imaplib
>
> m = imaplib.IMAP4_SSL('imap.gmail.com', 443)
> m.login(username, password)
>
>
> And I get the following:
>
>
> Traceback (most recent call last):
>  File "D:\MyProjects\gmail.py", line 17, in <module>
>    m = imaplib.IMAP4_SSL('imap.gmail.com', 443)
>  File "C:\Python26\lib\imaplib.py", line 1138, in __init__
>    IMAP4.__init__(self, host, port)
>  File "C:\Python26\lib\imaplib.py", line 163, in __init__
>    self.open(host, port)
>  File "C:\Python26\lib\imaplib.py", line 1150, in open
>    self.sslobj = ssl.wrap_socket(self.sock, self.keyfile, self.certfile)
>  File "C:\Python26\lib\ssl.py", line 350, in wrap_socket
>    suppress_ragged_eofs=suppress_ragged_eofs)
>  File "C:\Python26\lib\ssl.py", line 118, in __init__
>    self.do_handshake()
>  File "C:\Python26\lib\ssl.py", line 293, in do_handshake
>    self._sslobj.do_handshake()
> ssl.SSLError: [Errno 8] _ssl.c:480: EOF occurred in violation of protocol
>
>
> OK. Then I googled back and forth for a possible solution, and I got a
> hint that (maybe) the problem could be related to proxy
> authentication. And I tried this solution (which uses SocksiPy) I
> found on the web (username2 and password2 are the user name and
> password for our company's proxy):
>
> import socks
> import socket
>
> proxy_ip = "10.100.100.20"   # Your proxy IP/DNS here
>
> socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, proxy_ip, 8080, True,
> username2, password2)
> socket.socket = socks.socksocket
>
> import imaplib
>
> m = imaplib.IMAP4_SSL('imap.gmail.com', 443)
> m.login(username, password)
>
>
> This solution just hangs forever at the line:
>
> m = imaplib.IMAP4_SSL('imap.gmail.com', 443)
>
> And it never returns (it never gets to the m.login() stuff).
>
>
> Then I tried with libgmail, giving it the option of setting the proxy
> name and port:
>
> import libgmail
>
> # Connect from behind a proxy www.myproxy.org:3128 using
> # proxy authentication user = 'john', password = 'proxy4321'
> libgmail.PROXY_URL = username2:password2 at my_company_proxy:443'  #
> Define the proxy
>
> ga = libgmail.GmailAccount(username, password)
> ga.login()
>
>
> And I got this at first:
>
> Traceback (most recent call last):
>  File "D:\MyProjects\gmail2.py", line 8, in <module>
>    ga.login()
>  File "C:\Python26\lib\site-packages\libgmail.py", line 305, in login
>    pageData = self._retrievePage(req)
>  File "C:\Python26\lib\site-packages\libgmail.py", line 340, in
> _retrievePage
>    req = ClientCookie.Request(urlOrRequest)
>  File "C:\Python26\lib\site-packages\mechanize\_request.py", line 31,
> in __init__
>    if not _rfc3986.is_clean_uri(url):
>  File "C:\Python26\lib\site-packages\mechanize\_rfc3986.py", line 63,
> in is_clean_uri
>    return not bool(BAD_URI_CHARS_RE.search(uri))
> TypeError: expected string or buffer
>
>
> Then I brutally hacked into mechanize here and there and I was able to
> fix all non-internet related errors. And when I try the libgmail
> solution above now I get:
>
> Traceback (most recent call last):
>  File "D:\MyProjects\gmail2.py", line 8, in <module>
>    ga.login()
>  File "C:\Python26\lib\site-packages\libgmail.py", line 305, in login
>    pageData = self._retrievePage(req)
>  File "C:\Python26\lib\site-packages\libgmail.py", line 348, in
> _retrievePage
>    resp = self.opener.open(req)
>  File "C:\Python26\lib\site-packages\mechanize\_opener.py", line 193, in
> open
>    response = urlopen(self, req, data)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 344, in _open
>    '_open', req)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 332, in _call_chain
>    result = func(*args)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 1171, in https_open
>    return self.do_open(conn_factory, req)
>  File "C:\Python26\lib\site-packages\gmail_transport.py", line 145, in
> do_open
>    return ClientCookie.HTTPSHandler.do_open(self,
> ProxyHTTPSConnection.new_auth(self.proxy, self.proxy_user,
> self.proxy_passwd), req)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 1118, in do_open
>    raise URLError(err)
> urllib2.URLError: <urlopen error Tunnel connection failed: 403
> Forbidden ( The ISA Server denied the specified Uniform Resource
> Locator (URL).  )>
>
>
> Just in case, I have tried also with port 80, with similar results:
>
> Traceback (most recent call last):
>  File "D:\MyProjects\gmail2.py", line 8, in <module>
>    ga.login()
>  File "C:\Python26\lib\site-packages\libgmail.py", line 305, in login
>    pageData = self._retrievePage(req)
>  File "C:\Python26\lib\site-packages\libgmail.py", line 348, in
> _retrievePage
>    resp = self.opener.open(req)
>  File "C:\Python26\lib\site-packages\mechanize\_opener.py", line 193, in
> open
>    response = urlopen(self, req, data)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 344, in _open
>    '_open', req)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 332, in _call_chain
>    result = func(*args)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 1171, in https_open
>    return self.do_open(conn_factory, req)
>  File "C:\Python26\lib\site-packages\gmail_transport.py", line 145, in
> do_open
>    return ClientCookie.HTTPSHandler.do_open(self,
> ProxyHTTPSConnection.new_auth(self.proxy, self.proxy_user,
> self.proxy_passwd), req)
>  File "C:\Python26\lib\site-packages\mechanize\_urllib2_fork.py",
> line 1118, in do_open
>    raise URLError(err)
> urllib2.URLError: <urlopen error Tunnel connection failed: 407 Proxy
> Authentication Required ( The ISA Server requires authorization to
> fulfill the request. Access to the Web Proxy filter is denied.  )>
>
>
> What am I doing wrong? Is there anything I should do differently? Or
> anything else I should try?
>
> Thank you for your help, any suggestion is highly appreciated.
>
>
> Andrea.
>
> "Imagination Is The Only Weapon In The War Against Reality."
> http://xoomer.alice.it/infinity77/
>
> ==> Never *EVER* use RemovalGroup for your house removal. You'll
> regret it forever.
> http://thedoomedcity.blogspot.com/2010/03/removal-group-nightmare.html <==
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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