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 Topic: Bug using authnz_ldap_module with Microsoft LDAP SDK and lda |
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elygre
Joined: 26 Feb 2013
Posts: 5
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 Posted: Tue 26 Feb '13 20:12 Post subject: Bug using authnz_ldap_module with Microsoft LDAP SDK and lda |
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(This is actually, and unfortunately, a cross post from users@httpd.apache.org, also readable at http://markmail.org/message/jqaw7ecddj2npcf3?q=ldaps+microsoft+ldap+sdk. But, the more eyes, the better.
We have been trying to set up Apache on Windows with ldaps (ssl) authentication, using apr-util compiled with the Microsoft ldap sdk. I believe I have identified a bug in the interaction between httpd (util_ldap.c) and apr-util which makes this combination impossible. This email is an attempt to explain the problem and get a second set of eyes on this. If people agree that this is / might be a bug, I'll file the proper issue and take it from there. (It fails on 2.4.4 and 2.2.something alike)
Does the below sound like a reasonable analysis? Am I missing something?
1) During initialization of util_ldap.c (http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/modules/ldap/util_ldap.c?view=markup), in util_ldap_post_config(): After calling apr_ldap_ssl_init(), on line 2031, the method apr_ldap_set_option (APR_LDAP_OPT_TLS_CERT) is always called, regardless of whether there are any global certs or not.
| Code: | 2020 /*
2021 * Initialize SSL support, and log the result for the benefit of the admin.
2022 *
2023 * If SSL is not supported it is not necessarily an error, as the
2024 * application may not want to use it.
2025 */
2026 rc = apr_ldap_ssl_init(p,
2027 NULL,
2028 0,
2029 &(result_err));
2030 if (APR_SUCCESS == rc) {
2031 rc = apr_ldap_set_option(ptemp, NULL, APR_LDAP_OPT_TLS_CERT,
2032 (void *)st->global_certs, &(result_err));
2033 }
2034
2035 if (APR_SUCCESS == rc) {
2036 st->ssl_supported = 1;
2037 ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2038 "LDAP: SSL support available" );
2039 }
2040 else {
2041 st->ssl_supported = 0;
2042 ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2043 "LDAP: SSL support unavailable%s%s",
2044 result_err ? ": " : "",
2045 result_err ? result_err->reason : "");
2046 } |
2) Now, in apr_ldap (http://svn.apache.org/viewvc/apr/apr-util/tags/1.4.1/ldap/apr_ldap_option.c?view=markup), the method apr_ldap_set_option() forwards to option_set_cert() (line 396), which ends up in the following code which *always* fails.
| Code: | 627 #if APR_HAS_MICROSOFT_LDAPSDK
628 /* Microsoft SDK use the registry certificate store - error out
629 * here with a message explaining this. */
630 result->reason = "LDAP: CA certificates cannot be set using this method, "
631 "as they are stored in the registry instead.";
632 result->rc = -1;
633 #endif |
3) The error_log has the following entries:
[Mon Feb 25 22:21:18 2013] [info] APR LDAP: Built with Microsoft Corporation. LDAP SDK
[Mon Feb 25 22:21:18 2013] [info] LDAP: SSL support unavailable: LDAP: CA certificates cannot be set using this method, as they are stored in the registry instead.
4) The bug, then, is that using the microsoft ldap sdk *always* fails with SSL:
- util_ldap.c always calls apr_ldap_set_option(...,APR_LDAP_OPT_TLS_CERT,...), even when there are no global certs
- apr_ldap_set_option(...,APR_LDAP_OPT_TLS_CERT,...) always fails when called with APR_HAS_MICROSOFT_LDAPSDK, even when there are no certs
5) Extracs of our config:
| Code: | LoadModule ldap_module modules/mod_ldap.so
LoadModule authnz_ldap_module modules/mod_authnz_ldap.so
<Location />
AuthLDAPURL ldaps://127.0.0.1:1389/ou=People,dc=example,dc=com?uid
</Location> |
6) There are two reasonable (?) fixes:
- util_ldap_post_config() should not call apr_ldap_set_option if there are not global certs (similar test can be found in same file, line 264)
- option_set_cert() should not fail if there are no certificates being set (probably less correct, but also more tolerant)
Does this sound like / look like a reasonable analysis? Am I missing something? |
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Steffen
Moderator
Joined: 15 Oct 2005
Posts: 3058
Location: Hilversum, NL, EU
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| Posted: Tue 26 Feb '13 20:21 Post subject: |
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Maybe you can post it also in Bugzilla, to get more/better attention.
Steffen
Last edited by Steffen on Tue 26 Feb '13 20:23; edited 1 time in total |
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elygre
Joined: 26 Feb 2013
Posts: 5
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| Posted: Tue 26 Feb '13 20:22 Post subject: |
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| Steffen wrote: | Maybe you can post it also in Bugzilla, to get more/better attention.
Steffen |
Will do, just wanted to see if anybody had any thoughts on the issue first  |
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admin
Site Admin
Joined: 15 Oct 2005
Posts: 679
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| Posted: Tue 26 Feb '13 20:25 Post subject: |
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Where did you downloaded Apache or did you build it your self ?
And VC9, VC10 or VC11 ? |
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elygre
Joined: 26 Feb 2013
Posts: 5
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| Posted: Tue 26 Feb '13 20:31 Post subject: |
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| admin wrote: | Where did you downloaded Apache or did you build it your self ?
And VC9, VC10 or VC11 ? |
Got it straight from apachelounge httpd-2.4.4-win32.zip  .
The analysis is strictly based on observed behaviour and source code, with the source code taken from the httpd subversion repository (there are a couple of links in the original message). |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7298
Location: Germany, Next to Hamburg
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| Posted: Fri 01 Mar '13 0:08 Post subject: Re: Bug using authnz_ldap_module with Microsoft LDAP SDK and |
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| elygre wrote: |
6) There are two reasonable (?) fixes:
- util_ldap_post_config() should not call apr_ldap_set_option if there are not global certs (similar test can be found in same file, line 264)
- option_set_cert() should not fail if there are no certificates being set (probably less correct, but also more tolerant)
Does this sound like / look like a reasonable analysis? Am I missing something? |
IMHO the first solution is the right way. It makes no sence to perform a check, if there is no certificate. |
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elygre
Joined: 26 Feb 2013
Posts: 5
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| Posted: Mon 04 Mar '13 21:27 Post subject: Bug with Microsoft LDAP SDK and ldaps (ssl) |
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After a quick discussion on the dev@httpd mailing list, I created a bug in mozilla (https://issues.apache.org/bugzilla/show_bug.cgi?id=54626), including a possible fix.
I am, unfortunately, unable to build and test a patched version myself. Is there anybody out there who would be willing to build a version containing the proposed fix, so that I can help verify that this actually works?
The following fix in ldap_util.c (http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/modules/ldap/util_ldap.c?view=markup) is believed to fix the problem (line 2026):
| Code: |
rc = apr_ldap_ssl_init(p,
NULL,
0,
&(result_err));
- if (APR_SUCCESS == rc) {
+ if (APR_SUCCESS == rc && !apr_is_empty_array(st->global_certs)) {
rc = apr_ldap_set_option(ptemp, NULL, APR_LDAP_OPT_TLS_CERT,
(void *)st->global_certs, &(result_err));
}
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Eirik |
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Steffen
Moderator
Joined: 15 Oct 2005
Posts: 3058
Location: Hilversum, NL, EU
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elygre
Joined: 26 Feb 2013
Posts: 5
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| Posted: Mon 04 Mar '13 23:21 Post subject: |
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Only in my dreams
I'll test it tomorrow.
Eirik |
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Steffen
Moderator
Joined: 15 Oct 2005
Posts: 3058
Location: Hilversum, NL, EU
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