php+mysql under httpd in fc3

Stanislav Malyshev stas at
Mon May 23 10:34:20 UTC 2005

I run FC3 with targeted policies (default install). I have a problem 
running connecting to mysql server from php under apache - the problem is 
that httpd/php is denied write access to mysql.sock, something like this:

fc3 kernel: audit(1116843116.146:0): avc:  denied { write } for pid=7281 
exe=/usr/sbin/httpd name=mysql.sock dev=dm-0 ino=375162 
scontext=root:system_r:httpd_t tcontext=user_u:object_r:var_lib_t 

Now, I have seen various modifications to policy sources that would allow 
it to work, but what I am asking is if it possible to do it without 
rebuilding policy from sources. The reason for this is that we need to 
make our ptoduce to install mysql & certain modules using it on user 
servers, and we can not count on policy sources being installed there. 
Also, the security of mysqld itself does not matter in this particular 
case and it is OK for us to run it unrestricted (it's separate server for 
this application only without network connection). The only problem is to 
allow restricted httpd to connect to that particular Unix socket.

I see that default system sources (apache.te) seem to include various 
types that seem to allow this, but I have no success in using them. If I 
try to use mysqld_var_run_t chcon gives me "Invalid argument", same with 
mysqld_db_t. Also, I see that httpd_php_t has can_unix_connect() rule, 
while httpd_t does not, however I did not find any documentation on what 
these types are, what's teh difference and how one can use httpd_php_t. I 
see httpd is running now under httpd_t according to ps -eZ.

I tries also to set mysql.sock into tmp_t, then write error disappears, 
and this one appears instead:

fc3 kernel: audit(1116844521.972:0): avc:  denied { connectto } for 
pid=7275 exe=/usr/sbin/httpd path=/var/lib/mysql/mysql.sock 
scontext=root:system_r:httpd_t tcontext=user_u:system_r:unconfined_t 

I am rather new to all SELinux concepts, so if anyone can give me some 
explanations about this or point me to some docs that describe these 
things it will be appreciated.

Stanislav Malyshev, Zend Products Engineer 
stas at +972-3-6139665 ext.115

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