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SELINUX: Add squid_port_t to the policy tunables #265

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As Squid is a popular Forward Proxy platform, and security binaries should be compiled by trusted partners, add use of squid_port_t to the supplied SELINUX policy object.

Satisfies Issue #162

Issue number being addressed

Fixes #162

Summary of the change

Adds squid_port_t to the list of ports allowed by the SELINUX policy tunables pam_duo_permit_sshd and pam_duo_permit_local_login.

Test Plan

Should be no different from current testing of forward proxies. We have internally validated this change at the University of Maine System.

As Squid is a popular Forward Proxy platform, and security binaries
should be compiled by trusted partners, add use of squid_port_t to the
supplied SELINUX policy object.

Satisfies Issue duosecurity#162
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We will likely bring this up with our paid support contact, so attention would be appreciated.

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selinux policy prevents proxy through squid port 3128
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