SELinux Blocking LDAP Connections
Daniel J Walsh
dwalsh at redhat.com
Wed Jun 29 19:05:15 UTC 2005
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/mydomain.com-error_log
>>> [Tue Jun 28 17:21:37 2005] [warn] [client 192.168.1.1] [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
>
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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
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