CAPTEST:(8) System Administration Utilities CAPTEST:(8)
captest - a program to demonstrate capabilities
captest [ --ambient --drop-all | --drop-caps | --id ] [ --init- grp ] [ --lock ] [ --text ]
captest is a program that demonstrates and prints out the current process capabilities. Each option prints the same report. It will output current capabilities. then it will try to access /etc/shadow directly to show if that can be done. Then it creates a child process that attempts to read /etc/shadow and outputs the results of that. Then it outputs the capabilities that a child process would have. You can also apply file system capabilities to this program to study how they work. For example, filecap /usr/bin/captest chown. Then run captest as a normal user. Another interesting test is to make captest suid root so that you can see what the interaction is between root's credentials and capabilities. For example, chmod 4755 /usr/bin/captest. When run as a normal user, the program will see if privilege escalation is possible. But do not leave this app setuid root after you are don testing so that an attacker cannot take advantage of it.
--ambient This attempts to add CAP_CHOWN ambient capability. --drop-all This drops all capabilities including ambient and clears the bounding set. --drop-caps This drops just traditional capabilities. --id This changes to uid and gid 99, drops supplemental groups, and clears the bounding set. --init-grp This changes to uid and gid 99 and then adds any supplemental groups that comes with that account. You would have add them prior to testing because by default there are no supplemental groups on account 99. --text This option outputs the effective capabilities in text rather than numerically. --lock This prevents the ability for child processes to regain privileges if the uid is 0.
This page is part of the libcap-ng (capabilities commands and library (NG)) project. Information about the project can be found at ⟨https://people.redhat.com/sgrubb/libcap-ng/⟩. It is not known how to report bugs for this man page; if you know, please send a mail to email@example.com. This page was obtained from the tarball libcap-ng-0.8.2.tar.gz fetched from ⟨https://people.redhat.com/sgrubb/libcap-ng/index.html⟩ on 2020-12-18. If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up- to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to firstname.lastname@example.org Red Hat Sept 2020 CAPTEST:(8)
Pages that refer to this page: capabilities(7)