cfb13e0a97
The caph_enter function should made it easier to sandbox application and not force us to remember that we need to check errno on failure. Another function is also checking if casper is present. Reviewed by: emaste, cem (partially) Differential Revision: https://reviews.freebsd.org/D14557
146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/*-
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* Copyright (c) 2016 Mariusz Zaborski <oshogbo@FreeBSD.org>
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CAPSICUM_HELPERS_H_
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#define _CAPSICUM_HELPERS_H_
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <nl_types.h>
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#include <termios.h>
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#include <time.h>
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#include <unistd.h>
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#include <libcasper.h>
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#define CAPH_IGNORE_EBADF 0x0001
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#define CAPH_READ 0x0002
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#define CAPH_WRITE 0x0004
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#define CAPH_LOOKUP 0x0008
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static __inline int
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caph_limit_stream(int fd, int flags)
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{
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cap_rights_t rights;
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unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ, FIODTYPE };
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cap_rights_init(&rights, CAP_EVENT, CAP_FCNTL, CAP_FSTAT,
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CAP_IOCTL, CAP_SEEK);
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if ((flags & CAPH_READ) != 0)
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cap_rights_set(&rights, CAP_READ);
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if ((flags & CAPH_WRITE) != 0)
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cap_rights_set(&rights, CAP_WRITE);
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if ((flags & CAPH_LOOKUP) != 0)
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cap_rights_set(&rights, CAP_LOOKUP);
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if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
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if (errno == EBADF && (flags & CAPH_IGNORE_EBADF) != 0)
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return (0);
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return (-1);
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}
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if (cap_ioctls_limit(fd, cmds, nitems(cmds)) < 0 && errno != ENOSYS)
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return (-1);
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if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS)
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return (-1);
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return (0);
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}
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static __inline int
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caph_limit_stdin(void)
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{
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return (caph_limit_stream(STDIN_FILENO, CAPH_READ));
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}
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static __inline int
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caph_limit_stderr(void)
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{
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return (caph_limit_stream(STDERR_FILENO, CAPH_WRITE));
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}
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static __inline int
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caph_limit_stdout(void)
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{
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return (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE));
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}
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static __inline int
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caph_limit_stdio(void)
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{
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const int iebadf = CAPH_IGNORE_EBADF;
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if (caph_limit_stream(STDIN_FILENO, CAPH_READ | iebadf) == -1 ||
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caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | iebadf) == -1 ||
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caph_limit_stream(STDERR_FILENO, CAPH_WRITE | iebadf) == -1)
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return (-1);
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return (0);
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}
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static __inline void
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caph_cache_tzdata(void)
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{
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tzset();
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}
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static __inline void
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caph_cache_catpages(void)
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{
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(void)catopen("libc", NL_CAT_LOCALE);
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}
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static __inline int
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caph_enter(void)
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{
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if (cap_enter() < 0 && errno != ENOSYS)
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return (-1);
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return (0);
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}
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static __inline int
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caph_enter_casper(void)
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{
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return (CASPER_SUPPORT == 0 ? 0 : caph_enter());
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}
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#endif /* _CAPSICUM_HELPERS_H_ */
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