Re: [secdir] [TLS] [certid] secdir review of draft-saintandre-tls-server-id-check-09

There is no black magic here, only the magic of the TLS server_name  
extension.  If the client provides server_name=gmail.com, the server  
provides a gmail.com cert, otherwise it defaults to mail.google.com.   
Your browser is following two secure delegations before it lands at www.google.com 
  (gmail.com -> mail.google.com -> www.google.com)  My guess based on  
the anecdotes in the thread is that IE8 doesn't support it.

(You should also be more careful about your HTTP emulation! "A client  
MUST include a Host header field in all HTTP/1.1 request messages .")

In full detail:

rbarnes$ openssl s_client -connect gmail.com:443 -servername gmail.com
[...]
subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=gmail.com
issuer=/C=US/O=Google Inc/CN=Google Internet Authority
[...]

GET / HTTP/1.1
Host: gmail.com

HTTP/1.1 301 Moved Permanently
Location: https://mail.google.com/mail/
[...]

rbarnes$ openssl s_client -connect mail.google.com:443 -servername  
mail.google.com
[...]
subject=/C=US/ST=California/L=Mountain View/O=Google Inc/ 
CN=mail.google.com
issuer=/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA
[...]

GET /mail/ HTTP/1.1
Host: mail.google.com

HTTP/1.1 302 Moved Temporarily
Location: https://www.google.com/accounts/ServiceLogin?service=mail&passive=true&rm=false&continue=https%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy%3Dl&bsv=1eic6yu9oa4y3&ss=1&scc=1&ltmpl=default&ltmplcache=2
[...]

rbarnes$ openssl s_client -connect www.google.com:443 -servername www.google.com
[...]
subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com
issuer=/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA
[...]

GET /accounts/ServiceLogin? 
service=mail&passive=true&rm=false&continue=https%3A%2F 
%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy 
%3Dl&bsv=1eic6yu9oa4y3&ss=1&scc=1&ltmpl=default&ltmplcache=2 HTTP/1.1
Host: www.google.com

HTTP/1.1 200 OK
[...]

On Sep 22, 2010, at 3:37 PM, Marsh Ray wrote:

> On 09/22/2010 01:31 PM, ArkanoiD wrote:
>> BTW, slightly offtopic here: whenever i connect to gmail.com, i get  
>> certificate
>> for mail.google.com. But i've yet to see any web browser to  
>> complain! Where is the magic?
>
> Seems totally relevant to me.
>
> Going to https://gmail.com/ I get some kind of redirection to https://www.google.com/accounts/ServiceLogin 
> ...
>
> I can confirm the silent redirect behavior on FF, an associate  
> reports it on IE9. I tried IE8 but get the expected "cert was issued  
> for a different website's address" error.
>
> Hopefully I'm overlooking something simple, but at first glance it  
> would seem like either of these two conditions are true:
>
> 1. Multiple vendors are putting some kind of override table in their  
> browsers with an entry for gmail.com.
>
> 2. Browsers are running script from badly authenticated sources.
>
> So what does gmail.com have in this situation that an attacker  
> couldn't obtain for phonygmail.com?
>
> - Marsh
>
>
> marsh@lamb:/tmp$ dig -t any gmail.com
>
> ; <<>> DiG 9.7.0-P1 <<>> -t any gmail.com
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44091
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 2
>
> ;; QUESTION SECTION:
> ;gmail.com.			IN	ANY
>
> ;; ANSWER SECTION:
> gmail.com.		300	IN	A	74.125.227.22
> gmail.com.		300	IN	A	74.125.227.21
> gmail.com.		300	IN	A	74.125.227.24
> gmail.com.		300	IN	A	74.125.227.23
> gmail.com.		86400	IN	NS	ns4.google.com.
> gmail.com.		86400	IN	NS	ns1.google.com.
> gmail.com.		86400	IN	SOA	ns1.google.com. dns-admin.google.com.  
> 1427981 21600 3600 1209600 300
> gmail.com.		3600	IN	MX	40 alt4.gmail-smtp-in.l.google.com.
> gmail.com.		3600	IN	MX	5 gmail-smtp-in.l.google.com.
> gmail.com.		3600	IN	MX	20 alt2.gmail-smtp-in.l.google.com.
> gmail.com.		300	IN	TXT	"v=spf1 redirect=_spf.google.com"
>
> ;; ADDITIONAL SECTION:
> ns4.google.com.		85092	IN	A	216.239.38.10
> ns1.google.com.		85092	IN	A	216.239.32.10
>
> ;; Query time: 54 msec
> ;; SERVER: 192.168.1.3#53(192.168.1.3)
> ;; WHEN: Wed Sep 22 14:26:29 2010
> ;; MSG SIZE  rcvd: 330
>
>
>
> marsh@lamb:/tmp$ openssl s_client -connect gmail.com:443
> ...
> subject=/C=US/ST=California/L=Mountain View/O=Google Inc/ 
> CN=mail.google.com
> issuer=/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA
> ...
> ---
> GET / HTTP/1.0
>
> HTTP/1.0 200 OK
> Date: Wed, 22 Sep 2010 19:31:43 GMT
> Expires: -1
> Cache-Control: private, max-age=0
> Content-Type: text/html; charset=ISO-8859-1
> Set-Cookie:  
> PREF 
> =ID=8614650b9dda6802:TM=1285183903:LM=1285183903:S=B88jR4IHVEMJ7oJ7;  
> expires=Fri, 21-Sep-2012 19:31:43 GMT; path=/; domain=.google.com
> Set-Cookie:  
> NID 
> = 
> 39 
> = 
> nR1SfxSCd9I9frwdHUXGHtOKWCI2yKMLaVWVnRZk50jDJv4InnuJPuhruGHy2j8hWeKdBfO18SCZzEm6N0qMW_flPF6tF6i 
> -CvhRU1DrDDYvExygPnpew69GRLaWZeI0; expires=Thu, 24-Mar-2011 19:31:43  
> GMT; path=/; domain=.google.com; HttpOnly
> Server: gws
> X-XSS-Protection: 1; mode=block
>
> <!doctype html><html><head><meta http-equiv="content-type"  
> content="text/html; charset=ISO-8859-1"><title>Google</ 
> title 
> > 
> < 
> script 
> >window.google={kEI:"n1maTNKCA5O8zAXDpJFW",kEXPI:"24956,26758",kCSI: 
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