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1 | ********************************************** |
2 | IMAP AND SMTP AUTHENTICATION WITH SQUIRRELMAIL |
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3 | $Id$ |
4 | Chris Hilts tassium@squirrelmail.org |
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5 | ********************************************** |
6 | |
7 | Prior to SquirrelMail 1.3.3, only plaintext logins for IMAP and SMTP were |
8 | supported. With the release of SquirrelMail 1.3.3, support for the |
9 | CRAM-MD5 and DIGEST-MD5 auth mechanisms has been added. TLS support has |
10 | also been added. It is possible to use different methods for both IMAP and |
11 | SMTP. TLS is able to be enabled on a per-service basis as well. |
12 | Unless the administrator changes the authentication methods, SquirrelMail |
13 | will default to the "classic" plaintext methods, without TLS. |
14 | |
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15 | Note: There is no point in using TLS if your IMAP server is localhost. You need |
16 | root to sniff the loopback interface, and if you don't trust root, or an attacker |
17 | already has root, the game is over. You've got a lot more to worry about beyond |
18 | having the loopback interface sniffed. |
19 | |
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20 | REQUIREMENTS |
21 | ------------ |
22 | |
23 | CRAM/DIGEST-MD5 |
24 | * SquirrelMail 1.3.3 or higher |
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25 | * If you have the mhash extension to PHP, it will automatically |
26 | be used, which may help performance on heavily loaded servers. |
27 | ** NOTE: mhash is optional and no longer a requirement ** |
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28 | |
29 | TLS |
30 | * SquirrelMail 1.3.3 or higher |
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31 | * PHP 4.3.0 or higher (Check Release Notes for PHP 4.3.x information) |
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32 | * The "STARTTLS" command is NOT supported. The server you wish to use TLS |
33 | on must have a dedicated port listening for TLS connections. (ie. port |
34 | 993 for IMAP, 465 for SMTP) |
35 | |
36 | CONFIGURATION |
37 | ------------- |
38 | |
39 | All configuration is done using conf.pl, under main menu option #2. |
40 | |
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41 | conf.pl can now attempt to detect which mechanisms your servers support. |
42 | You must have set the host and port before attempting to detect, or you |
43 | may get inaccurate results, or a long wait while the connection times out. |
44 | |
45 | If you get results that you know are wrong when you use auto-detection, I |
46 | need to know about it. Please send me the results you got, the results you |
47 | expected, and server type, name, and version (eg. "imap, Cyrus, v2.1.9"). |
48 | |
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49 | KNOWN ISSUES |
50 | ------------ |
51 | |
52 | DIGEST-MD5 has three different methods of operation. (qop options "auth", |
53 | "auth-int" and "auth-conf"). This implementation currently supports "auth" |
54 | only. Work is being done to add the other two modes. |
55 | |
56 | DIGEST-MD5 _may_ fail when authenticating with servers that supply more |
57 | than one "realm". I have no servers of this type to test on, so if you do |
58 | and it fails, let me know! (A big help would be for you to telnet to your |
59 | server, start a DIGEST-MD5 auth session, and include the challenge from the |
60 | server in your bug report.) |
61 | |
62 | To get the challenge with IMAP: |
63 | telnet <your server> imap |
64 | [server says hello] |
65 | A01 AUTHENTICATE DIGEST-MD5 |
66 | <copy the gobbledygook that the server sends - this is what I need> |
67 | * |
68 | [server says auth aborted] |
69 | A02 LOGOUT |
70 | [server says goodbye, closes connection] |
71 | |
72 | To get the challenge with SMTP: |
73 | telnet <your server> smtp |
74 | [server sends some sort of "hello" banner] |
75 | EHLO myhostname |
76 | [server will probably list a bunch of capabilities] |
77 | AUTH DIGEST-MD5 |
78 | <copy the gobbledygook that the server sends - this is what I need> |
79 | * |
80 | [server says auth aborted] |
81 | QUIT |
82 | [server says bye, closes connection] |
83 | |
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84 | |
85 | OPTIONAL SMTP AUTH CONFIGURATION |
86 | -------------------------------- |
87 | |
88 | If you need all users to send mail via an upstream SMTP provider |
89 | (your ISP, for example), and that ISP requires authentication, |
90 | there are two variables that can be added to config_local.php |
91 | that will specify a sitewide SMTP username and password. |
92 | |
93 | Set up SMTP authentication to the remote server according to the |
94 | instructions above, then add the following to config_local.php, |
95 | replacing <smtp_user> and <smtp_pass> with the username and password |
96 | you'd like to use for the entire site: |
97 | |
98 | $smtp_sitewide_user = '<smtp_user>'; |
99 | $smtp_sitewide_pass = '<smtp_pass>'; |
100 | |
101 | These values will be used to connect to the SMTP server as long |
102 | as the authentication mechanism is something besides 'none', i.e. |
103 | 'login','plain','cram-md5', or 'digest-md5'. |
104 | |
105 | |
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106 | [End] |