b8676cf7 |
1 | Internet Explorer and SSL |
2 | Luke Ehresman <luke@squirrelmail.org> |
3 | ===================================== |
4 | |
5 | I've just spent the last few days trying to track down the now famous bug |
6 | with IE and SSL. The problem lies in the fact that PHP sends some no-cache |
7 | headers whenever a session is started. IE chokes when trying to download a |
8 | file that it can't cache over SSL. We use session management to store many |
9 | things, one being the key to decypher the password. |
10 | |
11 | Once we had figured out that it was sessions in PHP that was causing the |
12 | problem, we tried turning the session management off in the download script |
13 | in Squirrelmail. This introduced another problem for us because we NEEDED |
14 | sessions to decypher the key so we could log into the IMAP server and |
15 | download the attachment. |
16 | |
17 | Next we tried leaving the sessions turned off, but passed the key in through |
18 | a GET parameter. This worked, but is obviously not a very secure way of |
19 | handling things. |
20 | |
21 | Our quest continued for a good solution. Finally, I was browsing through |
22 | the source of PHP, I noticed the 2 headers it was sending were "Pragma" and |
23 | "Cache-Control". I had the crazy idea of defining these again after the |
24 | session had been started, and lo and behold, it worked! Below is the code |
25 | that made this work: |
26 | |
27 | session_start() |
28 | header("Pragma: "); |
29 | header("Cache-Control: cache"); |
30 | |
31 | With all the testing I have done, this works, and works very well for all |
32 | browsers. |
1ffd5e31 |
33 | |
34 | |
35 | This was submitted by Marcin Jessa <yazzy@yazzy.org> |
36 | ==================================================== |
37 | Reading INSTALL file of SqWebMail i found following note: |
38 | |
39 | Tweak the web server for MSIE |
40 | The MSIE browser has a number of bugs in its HTTP/1.1 implementation, |
41 | at least as of MSIE 4.x and 5.x. You must configure your web server to |
42 | use HTTP/1.0 when talking to any MSIE browser (at least until MSIE |
43 | gets fixed). The problem has to do with downloading attachments. |
44 | Apparently, MSIE forgets how MIME works, when it uses HTTP/1.1. For |
45 | the Apache server, insert the following directive in httpd.conf: |
46 | |
47 | BrowserMatch "MSIE" nokeepalive downgrade-1.0 force-response-1.0 |
48 | |
49 | Recent versions of Apache already have a similar directive for a |
50 | specific version of MSIE, MSIE 4.0b2. Just replace it with a |
51 | browsermatch for any MSIE version. |