It would seem to me that a pressure campaign to extend existing OS licenses to include a BDS license has the potential to see adoption among the more progressive tech-bros and at least significantly inconvenience tech firms in occupied Palestine. I did some (admittedly very spotty) research and couldn't find anything.
IANAL, and I'm also not a lawyer, so I won't try to model language, but I'm kinda surprised that I couldn't find a pre-existing example.
Pretty sure national origin is protected under the civil rights act, and the US recognizes Israel.
Since Palestine is not a country recognized by the US, it is legal to discriminate against them, but illegal to discriminate against Israelis.
I don't think the Civil Rights Act confers protected-status on companies.