bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Aaron Jensen]

This post describes a method for configuring emacs to verify ssl
certificates:
https://glyph.twistedmatrix.com/2015/11/editor-malware.html

It also contains a snippet to test that it is properly configured:

(let ((bad-hosts
       (loop for bad
             in `("https://wrong.host.badssl.com/"
                  "https://self-signed.badssl.com/")
             if (condition-case e
                    (url-retrieve
                     bad (lambda (retrieved) t))
                  (error nil))
             collect bad)))
  (if bad-hosts
      (print (format "tls misconfigured; retrieved %s ok"
                     bad-hosts))
    (url-retrieve "https://badssl.com"
                  (lambda (retrieved) t))))

This snippet works fine in 25.2 but reports an error on master (26.0.50)

As a simpler test, both:

(url-retrieve "https://wrong.host.badssl.com/")
(url-retrieve-synchronously "https://wrong.host.badssl.com/")

Should fail, but do not.

This is the log output with gnutls-log-level 2

Contacting host: wrong.host.badssl.com:443
gnutls.c: [1] (Emacs) connecting to host: wrong.host.badssl.com
gnutls.c: [1] (Emacs) allocating credentials
gnutls.c: [2] (Emacs) allocating x509 credentials
gnutls.c: [2] (Emacs) using default verification flags
gnutls.c: [audit] There was a non-CA certificate in the trusted list:
O=Entrust.net,OU=www.entrust.net/CPS_2048 incorp. by ref. (limits
liab.),OU=(c) 1999 Entrust.net Limited,CN=Entrust.net Certification
Authority (2048).

gnutls.c: [1] (Emacs) setting the trustfile:  /usr/local/etc/libressl/cert.pem
gnutls.c: [audit] There was a non-CA certificate in the trusted list:
O=Entrust.net,OU=www.entrust.net/CPS_2048 incorp. by ref. (limits
liab.),OU=(c) 1999 Entrust.net Limited,CN=Entrust.net Certification
Authority (2048).

gnutls.c: [1] (Emacs) gnutls callbacks
gnutls.c: [1] (Emacs) gnutls_init
gnutls.c: [1] (Emacs) got non-default priority string: NORMAL
gnutls.c: [1] (Emacs) setting the priority string
gnutls.c: [audit] Note that the security level of the Diffie-Hellman
key exchange has been lowered to 256 bits and this may allow
decryption of the session data

gnutls.c: [2] HSK[0x1178ab200]: sent server name: 'wrong.host.badssl.com'

gnutls.c: [1] (Emacs) non-fatal error: Resource temporarily
unavailable, try again. [3 times]
gnutls.c: [2] received curve SECP256R1

gnutls.c: [1] (Emacs) non-fatal error: Resource temporarily
unavailable, try again. [2 times]
gnutls.c: [2] (Emacs) Deallocating x509 credentials


Has the usage of url-retrieve changed such that it no longer throws
errors in this case or is this a bug?

If it is not a bug, what is the new preferred way of verifying that
certificate validation is indeed working?

Thanks!


In GNU Emacs 26.0.50 (build 1, x86_64-apple-darwin16.5.0, NS
appkit-1504.82 Version 10.12.4 (Build 16E195))
 of 2017-05-08 built on aaron
Repository revision: 52f7440b8ea8e18f7e83f8d107bd5e4df1bda7b1
Windowing system distributor 'Apple', version 10.3.1504
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bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Mon, 8 May 2017 11:42:45 -0700
> 
> This post describes a method for configuring emacs to verify ssl
> certificates:
> https://glyph.twistedmatrix.com/2015/11/editor-malware.html
> 
> It also contains a snippet to test that it is properly configured:
> 
> (let ((bad-hosts
>        (loop for bad
>              in `("https://wrong.host.badssl.com/"
>                   "https://self-signed.badssl.com/")
>              if (condition-case e
>                     (url-retrieve
>                      bad (lambda (retrieved) t))
>                   (error nil))
>              collect bad)))
>   (if bad-hosts
>       (print (format "tls misconfigured; retrieved %s ok"
>                      bad-hosts))
>     (url-retrieve "https://badssl.com"
>                   (lambda (retrieved) t))))
> 
> This snippet works fine in 25.2 but reports an error on master (26.0.50)
> 
> As a simpler test, both:
> 
> (url-retrieve "https://wrong.host.badssl.com/")
> (url-retrieve-synchronously "https://wrong.host.badssl.com/")
> 
> Should fail, but do not.

I seem to be unable to reproduce any of the wrong behavior in the
current master build.  Could you please provide more details about
what errors you see and what failures you expected, but didn't see?

In my testing, Emacs asks me whether to continue connecting, when it
discovers a bad certificate, and it's up to me to decide.  Did it ask
you, and if it did, what alternative did you select?

Also, did you try all this in "emacs -Q"?  It looks like you did this
in a customized session (e.g., because in "emacs -Q" there's no 'loop'
function, which the above snippet uses).  So the problems could have
something to do with your customizations.

Thanks.

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Aaron Jensen]

On Mon, May 8, 2017 at 12:04 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Aaron Jensen <aaronjensen@gmail.com>
>> Date: Mon, 8 May 2017 11:42:45 -0700
>>
> I seem to be unable to reproduce any of the wrong behavior in the
> current master build.  Could you please provide more details about
> what errors you see and what failures you expected, but didn't see?
>
> In my testing, Emacs asks me whether to continue connecting, when it
> discovers a bad certificate, and it's up to me to decide.  Did it ask
> you, and if it did, what alternative did you select?
>
> Also, did you try all this in "emacs -Q"?  It looks like you did this
> in a customized session (e.g., because in "emacs -Q" there's no 'loop'
> function, which the above snippet uses).  So the problems could have
> something to do with your customizations.

It repros in `emacs -Q', just set:

(setq gnutls-verify-error t)
(url-retrieve-synchronously "https://wrong.host.badssl.com/")

In Emacs 25.2, this causes an error to be thrown when you use
url-retrieve, in 26, it silently proceeds.

Also, I can confirm that if gnutls-verify-error is nil, it prompts as
you described. I'll leave it as that for now in my config.

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Eli Zaretskii]

[Resending, as I messed up the previous message.  Apologies.]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Mon, 8 May 2017 12:44:52 -0700
> Cc: 26835@debbugs.gnu.org
> 
> It repros in `emacs -Q', just set:
> 
> (setq gnutls-verify-error t)
> (url-retrieve-synchronously "https://wrong.host.badssl.com/")
> 
> In Emacs 25.2, this causes an error to be thrown when you use
> url-retrieve, in 26, it silently proceeds.

That's because we now perform GnuTLS negotiation asynchronously,
without blocking.  When the certificate matching fails, gnutls.c
faithfully stores the error message in the process's status by calling
boot_error:

	      boot_error (p, "The x509 certificate does not match \"%s\"",
			  c_hostname);

and boot_error does:

  static void ATTRIBUTE_FORMAT_PRINTF (2, 3)
  boot_error (struct Lisp_Process *p, const char *m, ...)
  {
    va_list ap;
    va_start (ap, m);
    if (p->is_non_blocking_client)
      pset_status (p, list2 (Qfailed, vformat_string (m, ap)));

So the process status becomes the list (failed "error message").  But
when url-retrieve-synchronously accesses the status, by calling
process-status, we do this:

  status = p->status;
  if (CONSP (status))
    status = XCAR (status);

which loses the error message, leaving just 'failed'.  So
url-retrieve-synchronously silently exits, and doesn't even have the
info that could cause it to signal an error.

IOW, the problem is not that the connection proceeds -- it does not.
The problem is that it fails silently without telling the caller what
caused the failure.

I'll CC Lars, who introduced the non-blocking connections.

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> It repros in `emacs -Q', just set:
>> 
>> (setq gnutls-verify-error t)
>> (url-retrieve-synchronously "https://wrong.host.badssl.com/")
>> 
>> In Emacs 25.2, this causes an error to be thrown when you use
>> url-retrieve, in 26, it silently proceeds.
>
> That's because we now perform GnuTLS negotiation asynchronously,
> without blocking.

(As an aside, perhaps url-retrieve-synchronously should be opening the
socket with :nowait nil?)

>   status = p->status;
>   if (CONSP (status))
>     status = XCAR (status);
>
> which loses the error message, leaving just 'failed'.  So
> url-retrieve-synchronously silently exits, and doesn't even have the
> info that could cause it to signal an error.
>
> IOW, the problem is not that the connection proceeds -- it does not.
> The problem is that it fails silently without telling the caller what
> caused the failure.
>
> I'll CC Lars, who introduced the non-blocking connections.

Good analysis.  I'll try to have a look at this soonish (and make it
report the error properly) unless somebody else beats me to it.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Aaron Jensen <aaronjensen@gmail.com>,  26835@debbugs.gnu.org
> Date: Wed, 10 May 2017 16:24:13 +0200
> 
> >> (setq gnutls-verify-error t)
> >> (url-retrieve-synchronously "https://wrong.host.badssl.com/")
> >> 
> >> In Emacs 25.2, this causes an error to be thrown when you use
> >> url-retrieve, in 26, it silently proceeds.
> >
> > That's because we now perform GnuTLS negotiation asynchronously,
> > without blocking.
> 
> (As an aside, perhaps url-retrieve-synchronously should be opening the
> socket with :nowait nil?)

Yes, I had a similar thought while I was reading the code.

> Good analysis.  I'll try to have a look at this soonish (and make it
> report the error properly) unless somebody else beats me to it.

Thanks.

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Eli Zaretskii]

> Date: Wed, 10 May 2017 19:48:32 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 26835@debbugs.gnu.org, aaronjensen@gmail.com
> 
> > From: Lars Ingebrigtsen <larsi@gnus.org>
> > Cc: Aaron Jensen <aaronjensen@gmail.com>,  26835@debbugs.gnu.org
> > Date: Wed, 10 May 2017 16:24:13 +0200
> > 
> > >> (setq gnutls-verify-error t)
> > >> (url-retrieve-synchronously "https://wrong.host.badssl.com/")
> > >> 
> > >> In Emacs 25.2, this causes an error to be thrown when you use
> > >> url-retrieve, in 26, it silently proceeds.
> > >
> > > That's because we now perform GnuTLS negotiation asynchronously,
> > > without blocking.
> > 
> > (As an aside, perhaps url-retrieve-synchronously should be opening the
> > socket with :nowait nil?)
> 
> Yes, I had a similar thought while I was reading the code.
> 
> > Good analysis.  I'll try to have a look at this soonish (and make it
> > report the error properly) unless somebody else beats me to it.
> 
> Thanks.

Ping!  Lars, any news on this issue?

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Lars Ingebrigtsen]

This should now be fixed.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 26835-done@debbugs.gnu.org,  aaronjensen@gmail.com
> Date: Wed, 13 Sep 2017 20:11:15 +0200
> 
> This should now be fixed.

Thanks!

bug#26835: 26.0.50; url-retrieve no longer raises certificate errors

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> (As an aside, perhaps url-retrieve-synchronously should be opening the
>> socket with :nowait nil?)
>
> Yes, I had a similar thought while I was reading the code.

And if we have :nowait nil in that case, then the error will be thrown
as advertised.

So I think I'll just make that change...  somehow.  (The URL code is,
er, funny.)

-- 
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   bloggy blog: http://lars.ingebrigtsen.no