Patched 'krb5_child' cap-set-id tests #8313
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If CAP_SETUID and/or CAP_SETGID are missing, 'krb5_child' will skip operation that require those capabilities, namely any manipulations with user ccache. :packaging:This update makes it possible to not grant CAP_SETUID and CAP_SETGID to 'krb5_child' binary in a situation where it is not required to store acquired TGT after user authentication. Taking into account that it is already possible to avoid using CAP_DAC_READ_SEARCH if keytab is readable by SSSD service user, and usage of 'selinux_child' isn't always required, this allows to build a setup with completely privilege-less SSSD to serve certain use cases. In particular, this might be used to build a container running SSSD on OCP with a restricted profile.
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This pull request modifies krb5_child to function correctly even when it lacks CAP_SETUID and CAP_SETGID capabilities. The changes involve removing these capabilities from Makefile.am and sssd.spec.in, and adding logic to krb5_child.c to detect their absence and skip operations that require them, such as updating the user's ccache. While the logic is generally sound, there's a minor logic issue in privileged_krb5_setup that could be simplified for better readability and to avoid redundant operations. Additionally, a new check in renew_tgt_child could be more robust.
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