64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* cap.c - POSIX capability support
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* Time-stamp: <2010-11-12 09:01:07 njk>
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*
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* (c) 2004-2010 Nicholas J. Kain <njkain at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <unistd.h>
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#include <sys/capability.h>
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#include <sys/prctl.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <grp.h>
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#include "log.h"
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void set_cap(uid_t uid, gid_t gid, char *captxt)
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{
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cap_t caps;
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if (!captxt)
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suicide("FATAL - set_cap: captxt == NULL");
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if (prctl(PR_SET_KEEPCAPS, 1))
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suicide("FATAL - set_cap: prctl() failed");
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if (setgroups(0, NULL) == -1)
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suicide("FATAL - set_cap: setgroups() failed");
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if (setegid(gid) == -1 || seteuid(uid) == -1)
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suicide("FATAL - set_cap: seteuid() failed");
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caps = cap_from_text(captxt);
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if (!caps)
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suicide("FATAL - set_cap: cap_from_text() failed");
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if (cap_set_proc(caps) == -1)
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suicide("FATAL - set_cap: cap_set_proc() failed");
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cap_free(caps);
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}
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