I am trying to connect a Subversion on Apache to an LDAP server. Unfortunately, the LDAP server does not like many requests for the same user, and returns [Tue Feb 28 18:21:46 2012] [info] [client 10.0.0.1] [18717] auth_ldap authenticate: user philipp authentication failed; URI /cgi-bin/anon.pl [LDAP: ldap_simple_bind_s() failed][Administrative limit exceeded] when it thinks that it have been too many requests. The problem on the other side is that Subversion does an HTTP request for every single file, and I have a repository with approximately 1 million files in it, so every operation can result in a lot of HTTP requests with the same user. The amount of different users that are authenticating to my application is rather low, I have about 3 power-users, and up to 100 users that are using it sporadically (once per month or less often) I have configured the cache like this: LDAPSharedCacheSize 3000000 LDAPCacheEntries 1024 LDAPCacheTTL 600000 LDAPOpCacheEntries 1024 LDAPOpCacheTTL 600000 LDAPSharedCacheFile /var/cache/apache2/ldap.cache The shared cache file is created properly, and the cache seems the be working, but it does not seem to really cache the authentication requests. When I do approximately 30 requests, I am getting those statistics: LDAP Cache Information Cache Name Entries Avg. Chain Len. Hits Ins/Rem Purges Avg Purge Time LDAP URL Cache 1 (0% full) 1.0 30/31 97% 1/0 (none) 0ms ldaps://ldap.intranet/ou=people,dc=eu?uid (Searches) 1 (0% full) 1.0 30/62 48% 25/24 (none) 0ms ldaps://ldap.intranet/ou=people,dc=eu?uid (Compares) 0 (0% full) 0.0 0/0 100% 0/0 (none) 0ms ldaps://ldap.intranet/ou=people,dc=eu?uid (DNCompares) 0 (0% full) 0.0 0/0 100% 0/0 (none) 0ms The LDAP URL Cache seems to fully cache all the requests, but the Searches only cache 50%, so for every Hit, it still does one LDAP query. Is it possible to also cache the authentication requests? I do not see why repeated requests for exactly the same URL with exactly the same username and password need additional LDAP requests, I think they should be cached instead. My Subversion config: AuthzSVNAccessFile /etc/apache2/dav_svn.authz AuthLDAPURL ldaps://ldap.intranet/ou=people,dc=eu?uid AuthLDAPBindDN "uid=technuser,ou=people,dc=eu" Require valid-user Order deny,allow Deny from All AuthName "Please enter your UserID and password" AuthType Basic AuthBasicProvider ldap AuthzLDAPAuthoritative off Satisfy any I guess that the problem might be that Apache does not want to store cleartext-passwords in the cache, since that can be a security issue. I would suggest to either encrypt the cache, or to only write hashed username+password into the cache.
In 2.4.1, there is mod_authn_socache, which allows to solve this problem. But I guess mod_ldap's caching should be improved, too.
Hi. Currently I'm using: Ubuntu 12.04.1 LTS with apache2: Candidate: 2.2.22-1ubuntu1 and Ubuntu 12.04.4 LTS with apache2: Candidate: 2.2.14-5ubuntu8.9 As you can see unfortunately in the default Ubuntu repositories (for 10.04 and 12.04) there is only apache 2.2, and not 2.4 apache yet. I don't want to install apache 2.4 from binary sources, because I'm afraid that I will face another dependency issues after that. As how I see people are facing problems regarding to apache 2.4 (and it's modules) + Ubuntu 12.04 (or earlier) compatibility: http://askubuntu.com/questions/167205/apache-2-4-install-on-12-04-ends-up-with-non-standard-configuarion http://ubuntuforums.org/showthread.php?t=2011603 My question is that there is any workaround to solve this issue in apache 2.2? Do you have any plans to improve mod_ldap??? We are getting dozens of [LDAP: ldap_simple_bind_s() failed][Administrative limit exceeded] errors on a daily basis (we have a few hundred users and a few hundred commits daily) - receiving this error means that the commit also fails in this case. Earlier we used Ubuntu 9.10 with 2.2.12-1ubuntu2.1, and this error was not present there. So we also tried to change the mod_authnz_ldap.so and mod_ldap.so in 12.04 with the ones from 9.10, but this didn't help, we still receive this error on 12.04 (with the 9.10 modules also).
(In reply to comment #2) > > Currently I'm using: > Ubuntu 12.04.1 LTS > with apache2: Candidate: 2.2.22-1ubuntu1 > and > Ubuntu 12.04.4 LTS > with apache2: Candidate: 2.2.14-5ubuntu8.9 > Sorry, I meant Ubuntu 10.04.4 LTS, and not Ubuntu 12.04.4 So I'm currently using: Ubuntu 12.04.1 LTS with apache2: Candidate: 2.2.22-1ubuntu1 and Ubuntu 10.04.4 LTS with apache2: Candidate: 2.2.14-5ubuntu8.9
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