[Bug 2775] Improve kerberos credential forwarding support

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2775

--- Comment #10 from Charles Hedrick <hedrick at rutgers.edu> ---
I just checked Solaris 2.8. I has setuid and seteuid, but not setreid
or setresuid. Setuid sets real, effective, and saved. Seteuid sets
effective only. So you can get back from seteuid, but  not setuid. That
says that for Solaris 2.8 it isn't possible to do a temporary change of
real uid. That means if you want to support stuff that old you'll need
an #ifdef. If I were doing it, I woudl do that. (Indeed I'm willing to
write the code if you want, and test it on both Centos 7.5 and Solaris
2.8.)

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