Re: dansguardian and selinux

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Vikram Goyal wrote:
Hi,

I am running dansguardian ( content filter ) and squid. Versions:

dansguardian-2.8.0.6-1.2.fc8.rf
squid-2.6.STABLE17-1.fc8
selinux-policy-targeted-3.0.8-87.fc8

Well, I want to run dansguardian under selinux enforcing mode but due
some avcs I have to go to permissive mode or allow the blocked accesses,
neither of which I want.

Bug reporting is also not an option since it is not in the fedora repos.

The avcs are:

type=AVC msg=audit(1205054238.538:28): avc: denied { write } for pid=5640 comm="dansguardian" name="run" dev=dm-1 ino=5186 57 scontext=system_u:system_r:logrotate_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=dir

type=AVC msg=audit(1205054238.538:29): avc: denied { write } for pid=5640 comm="dansguardian" name="dansguardian.pid" dev=dm-1 ino=518711 scontext=system_u:system_r:logrotate_t:s0 tcontext=system_u:object_r:initrc_var_run_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/dansguardian/access.log-20080309" dev=dm-1 ino=1102242 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/dbmail.log-20080309" dev=dm-1 ino=1102187 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/dovecot.log-20080309" dev=dm-1 ino=1102273 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:dovecot_var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/rpmpkgs-20080309" dev=dm-1 ino=1102254 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:cron_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/messages-20080309" dev=dm-1 ino=1102211 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/secure-20080309" dev=dm-1 ino=1102245 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/maillog-20080309" dev=dm-1 ino=1102246 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/spooler-20080309" dev=dm-1 ino=1102272 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/boot.log-20080309" dev=dm-1 ino=1102291 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/cron-20080309" dev=dm-1 ino=1102292 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=AVC msg=audit(1205054238.870:30): avc: denied { read write } for pid=5652 comm="squid" path="/var/log/setroubleshoot/setroubleshootd.log-20080309" dev=dm-1 ino=1102249 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:setroubleshoot_var_log_t:s0 tclass=file

As you may see, except for the first three, the rest of the avcs show it
running wild and messing with a number of unrelated logs, which I don't
want to allow.

I am confused as to how it should be handeled.

Thanks!

I have attached a policy te file to handle these avc;s

These look like leaked file descriptors and I think dansguardian must be
starting up squid.

dansguardian should close open file descriptors on exec

fcntl(fd, F_SETFD, FD_CLOEXEC)

To use and install this policy extract the mysquid.te file into a
directory and execute
# yum -y install selinux-policy-devel
# make -f /usr/share/selinux/devel/Makefile
# semodule -i mysquid.pp
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module mysquid 1.0;

require {
type var_log_t;
type cron_log_t;
type dovecot_var_log_t;
type logrotate_t;
type var_run_t;
type initrc_var_run_t;
type squid_t;
type setroubleshoot_var_log_t;
class dir write;
class file { read write };
}

#============= logrotate_t ==============
dontaudit logrotate_t initrc_var_run_t:file write;
allow logrotate_t var_run_t:dir write;

#============= squid_t ==============
dontaudit squid_t cron_log_t:file { read write };
dontaudit squid_t dovecot_var_log_t:file { read write };
dontaudit squid_t setroubleshoot_var_log_t:file { read write };
dontaudit squid_t var_log_t:file { read write };

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