SELinux Blocking LDAP Connections

Justin Willmert justin at
Wed Jun 29 19:12:13 UTC 2005

Daniel J Walsh wrote:

> Justin Willmert wrote:
>> Stephen Smalley wrote:
>>> On Tue, 2005-06-28 at 18:22 -0500, Justin Willmert wrote:
>>>> Does anybody know of any problems with the new SELinux installed in 
>>>> Fedora Core 4? I have OpenLDAP 2.2.23-5 installed and use it for my 
>>>> user accounts. Fedora (throught the system-auth PAM module and 
>>>> nsswitch) will log in correctly, but dovecot (version 
>>>> 0.99.14-4.fc4) and apache (version 2.0.54-10) cannot connect to the 
>>>> ldap server when SELinux is enabled. I use dovecot-ldap.conf for 
>>>> dovecot to get the users and their home directories. In Apache, I 
>>>> use basic authentication through LDAP to protect a WebDAV 
>>>> accessible folder. For a long time, I thought Dovecot wasn't 
>>>> working correctly, but after I set up Apache and it too didn't work 
>>>> with OpenLDAP, I came to think that SELinux is blocking something. 
>>>> Now the problem is I am not well enough informed about SELinux to 
>>>> be able to debug where the problem may reside.
>>>> This is the message I get in /var/log/maillog when SELinux is enabled:
>>>>    Jun 28 17:21:14 netserv dovecot-auth: LDAP: ldap_result() 
>>>> failed: Can't contact LDAP server
>>>> And this is the error I get in /etc/httpd/logs/
>>>>    [Tue Jun 28 17:21:37 2005] [warn] [client] [5962] 
>>>> auth_ldap authenticate: user myuser authentication failed; URI 
>>>> /calendars/ [LDAP: ldap_simple_bind_s() failed][Can't contact LDAP 
>>>> server]
>>>> I can get you SELinux contexts for certain files if you need them, 
>>>> but I don't have a clue on which ones to include.
>>> Look in /var/log/audit/audit.log, particularly for messages with the
>>> type=AVC prefix.  SELinux permission denials are now logged there by 
>>> the
>>> audit daemon (previously they would go to /var/log/messages).  And
>>> report them to fedora-selinux-list.
>> Ok. I've been told (as you can see above) to report this problem to 
>> this list instead of fedora-list (Just used a mailing list for the 
>> first time yesterday, so I'm still learning about them). As you can 
>> see above, I'm having a problem with SELinux and Dovecot and Apache. 
>> After looking through my audit.log file, these are the lines I 
>> thought were most important.
>> This is what I found concerning apache:
>>    type=AVC msg=audit(1119048563.037:3670666): avc:  denied  {
>>    name_connect } for pid=6051 comm="httpd" dest=389      
>> scontext=root:system_r:httpd_t
>>    tcontext=system_u:object_r:ldap_port_t tclass=tcp_socket
>>    type=SOCKETCALL msg=audit(1119048563.054:3670776): nargs=3 a0=19
>>    a1=8347e80 a2=10
>>    type=SOCKADDR msg=audit(1119048563.054:3670776):
>>    saddr=02000185C0A801940000000000000000
>>    type=SYSCALL msg=audit(1119048563.054:3670776): arch=40000003
>>    syscall=102 success=no exit=-13 a0=3 a1=bfcf1ad0 a2=3c94cb8 a3=19
>>    items=0 pid=6052 auid=4294967295 uid=0 gid=48 euid=0 suid=0 fsuid=0
>>    egid=48 sgid=48 fsgid=48 comm="httpd" exe="/usr/sbin/httpd"
>> And this is what I found concerning Dovecot:
>>    type=AVC msg=audit(1119053800.290:1566630): avc:  denied  { read }
>>    for  pid=7472 comm="dovecot" name=stderr dev=tmpfs ino=2345
>>    scontext=root:system_r:dovecot_t tcontext=system_u:object_r:device_t
>>    tclass=lnk_file
>>    type=PATH msg=audit(1119053800.291:1566631): item=0 name="/dev"
>>    inode=534 dev=00:0d mode=040755 ouid=0 ogid=0 rdev=00:00
>>    type=SYSCALL msg=audit(1119053800.291:1566631): arch=40000003
>>    syscall=33 success=no exit=-13 a0=94e8100 a1=2 a2=94e8100 a3=739ca0
>>    items=1 pid=7472 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
>>    egid=0 sgid=0 fsgid=0 comm="dovecot" exe="/usr/sbin/dovecot"
>>    type=AVC msg=audit(1119053800.291:1566631): avc:  denied  { write }
>>    for  pid=7472 comm="dovecot" name=/ dev=tmpfs ino=534
>>    scontext=root:system_r:dovecot_t tcontext=system_u:object_r:device_t
>>    tclass=dir
>>    type=PATH msg=audit(1119053900.137:1641147): item=0
>>    name="/dev/stderr" inode=534 dev=00:0d mode=040755 ouid=0 ogid=0
>>    rdev=00:00
>> Both of these sets were repeated multiple times throughout the log.
>> Justin Willmert
>> -- 
>> fedora-selinux-list mailing list
>> fedora-selinux-list at
> You can allow httpd to connect via the boolean
> setsebool -P httpd_can_network_connect=1
> Any idea what dovecot is trying to create in the /dev directory?
> Dan
OK, I've reset the boolean, but I can't really test it because if I 
enable SELinux again, dovecot is going to stop working.

To the issue of what dovecot is doing to /dev, your guess is as good as 
mine. When I still ran FC3, I was using the University of Washington 
IMAP server, but FC4 wouldn't allow me to use it, so I upgraded to 
Dovecot. I'm still learning about it, so I have no clue it is trying to 
do to my /dev directory. I guess it's an issue I can look into (or 
someone can tell me if they know...It'd be faster ^_^ )


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