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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | AUTHOR | COLOPHON |
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CAPNG_CHANGE_ID(3) Libcap-ng API CAPNG_CHANGE_ID(3)
capng_change_id - change the credentials retaining capabilities
#include <cap-ng.h>
int capng_change_id(int uid, int gid, capng_flags_t flag);
This function will change uid and gid to the ones given while
retaining the capabilities previously specified in capng_update. It
is not necessary and perhaps better if capng_apply has not been
called prior to this function so that all necessary privileges are
still intact. The caller is required to have CAP_SETPCAP capability
still active before calling this function.
This function also takes a flag parameter that helps to tailor the
exact actions performed by the function to secure the environment.
The option may be or'ed together. The legal values are:
CAPNG_NO_FLAG
Simply change uid and retain specified capabilities and
that's all.
CAPNG_DROP_SUPP_GRP
After changing id, remove any supplement groups that
may still be in effect from the old uid.
CAPNG_INIT_SUPP_GRP
After changing id, initialize any supplement groups
that may come with the new account. If given with
CAPNG_DROP_SUPP_GRP it will have no effect.
CAPNG_CLEAR_BOUNDING
After changing the uid and gid, clear the bounding set
regardless to the internal representation already
setup.
This returns 0 on success and a negative number on failure. -1 means
capng has not been initted properly, -2 means a failure requesting to
keep capabilities across the uid change, -3 means that applying the
intermediate capabilities failed, -4 means changing gid failed, -5
means dropping supplemental groups failed, -6 means changing the uid
failed, -7 means dropping the ability to retain caps across a uid
change failed, -8 means clearing the bounding set failed, -9 means
dropping CAP_SETPCAP failed, -10 means initializing supplemental
groups failed.
Note: the only safe action to do upon failure of this function is to
probably exit. This is because you are likely in a situation with
partial permissions and not what you intended.
capng_update(3), capng_apply(3), prctl(2), capabilities(7)
Steve Grubb
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
man-pages@man7.org. This page was obtained from the tarball libcap-
ng-0.7.8.tar.gz fetched from
⟨https://people.redhat.com/sgrubb/libcap-ng/index.html⟩ on
2018-02-02. If you discover any rendering problems in this HTML ver‐
sion 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 man‐
ual page), send a mail to man-pages@man7.org
Red Hat Feb 2013 CAPNG_CHANGE_ID(3)
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