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42 lines
2.0 KiB
42 lines
2.0 KiB
.TH "CAPNG_CHANGE_ID" "3" "June 2009" "Red Hat" "Libcap-ng API"
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.SH NAME
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capng_change_id \- change the credentials retaining capabilities
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.SH "SYNOPSIS"
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.B #include <cap-ng.h>
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.sp
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int capng_change_id(int uid, int gid, capng_flags_t flag);
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.SH "DESCRIPTION"
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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.
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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:
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.RS
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.TP
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.B CAPNG_NO_FLAG
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Simply change uid and retain specified capabilities and that's all.
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.TP
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.B CAPNG_DROP_SUPP_GRP
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After changing id, remove and supplement groups that may come with the account.
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.TP
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.B CAPNG_CLEAR_BOUNDING
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After changing the uid and gid, clear the bounding set regardless to the internal representation already setup.
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.RE
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.SH "RETURN VALUE"
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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.
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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.
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.SH "SEE ALSO"
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.BR capng_update (3),
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.BR capng_apply (3),
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.BR prctl (2),
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.BR capabilities (7)
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.SH AUTHOR
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Steve Grubb
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