Question About Amavisd audit messages

[Daniel J Walsh]

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Ali Nebi wrote:
> Hi,
> 
> i want to ask about some audit messages realted with amavisd.
> 
> I get this kind of messages:
> 
> Oct 16 16:35:21 hermod kernel: audit(1192545321.959:4): avc:  denied
> { name_bind } for  pid=15305 comm="amavisd" src=3551
> scontext=system_u:system_r:amavis_t:s0 tcontext=system
> _u:object_r:apcupsd_port_t:s0 tclass=udp_socket
> Oct 17 06:41:11 hermod kernel: audit(1192596071.584:5): avc:  denied
> { name_bind } for  pid=1135 comm="amavisd" src=5353
> scontext=system_u:system_r:amavis_t:s0 tcontext=system_
> u:object_r:howl_port_t:s0 tclass=udp_socket
> Oct 17 14:45:13 hermod kernel: audit(1192625113.850:6): avc:  denied
> { name_bind } for  pid=8183 comm="amavisd" src=7004
> scontext=system_u:system_r:amavis_t:s0 tcontext=system_
> u:object_r:afs_ka_port_t:s0 tclass=udp_socket
> Oct 17 22:33:30 hermod kernel: audit(1192653210.933:7): avc:  denied
> { name_bind } for  pid=20082 comm="amavisd" src=7004
> scontext=system_u:system_r:amavis_t:s0 tcontext=system
> _u:object_r:afs_ka_port_t:s0 tclass=udp_socket
> Oct 17 23:00:40 hermod kernel: audit(1192654840.481:8): avc:  denied
> { name_bind } for  pid=21759 comm="amavisd" src=7007
> scontext=system_u:system_r:amavis_t:s0 tcontext=system
> _u:object_r:afs_bos_port_t:s0 tclass=udp_socket
> Oct 18 08:59:38 hermod kernel: audit(1192690778.529:9): avc:  denied
> { name_bind } for  pid=25286 comm="amavisd" src=5353
> scontext=system_u:system_r:amavis_t:s0 tcontext=system
> _u:object_r:howl_port_t:s0 tclass=udp_socket
> Oct 18 09:32:09 hermod kernel: audit(1192692729.031:10): avc:  denied
> { name_bind } for  pid=28781 comm="amavisd" src=1194
> scontext=system_u:system_r:amavis_t:s0 tcontext=syste
> m_u:object_r:openvpn_port_t:s0 tclass=udp_socket
> 
> These are a part of them, i allowed some of these, but there are many of
> these with different udp ports. What can i do to solve this problem,
> because amavisd try every time with a different port and i can't allow
> all of them?
> 
> Thank in advanced!
> 
> --
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> fedora-selinux-list at redhat.com
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amavis_t is binding to random ports > 1024 occasionaly it is hitting a
named port and getting a denial.  At that point it goes off and gets
another port.  When it gets a port that is not defined, it succeeds.
The policy needs a dontaudit rule to remove these avcs.


So the combination in policy is necessary.

corenet_udp_bind_generic_port(amavis_t)
corenet_dontaudit_udp_bind_all_ports(amavis_t)

This basically says amavis_t can bind to any udp port labeled port_t and
it it attempts to bind to a port that is labeled anything other then
port_t, dontaudit.  This is will be fixed in selinux-policy-3.0.8.28

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