990beb037d
The goal here is to make it so applications can take the rights one would
normally get by calling caph_limit_stream() on a descriptor and build on
them as needed.
The tentatively planned use-case is an application that takes a socket and
hooks it up to std{err,out,in} for a fork()d child. It may be feasible to
apply limitations to such descriptors as long as it's a superset of those
normally applied to stdio.
Reviewed by: markj, oshobo (prior version; sans manpage addition)
Differential Revision: https://reviews.freebsd.org/D22993
189 lines
4.3 KiB
C
189 lines
4.3 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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__BEGIN_DECLS
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static const unsigned long caph_stream_cmds[] =
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{ TIOCGETA, TIOCGWINSZ, FIODTYPE };
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static const uint32_t caph_stream_fcntls = CAP_FCNTL_GETFL;
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static __inline void
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caph_stream_rights(cap_rights_t *rights, int flags)
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{
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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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}
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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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caph_stream_rights(&rights, flags);
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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, caph_stream_cmds,
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nitems(caph_stream_cmds)) < 0 && errno != ENOSYS)
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return (-1);
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if (cap_fcntls_limit(fd, caph_stream_fcntls) < 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_rights_limit(int fd, const cap_rights_t *rights)
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{
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if (cap_rights_limit(fd, rights) < 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_ioctls_limit(int fd, const unsigned long *cmds, size_t ncmds)
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{
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if (cap_ioctls_limit(fd, cmds, ncmds) < 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_fcntls_limit(int fd, uint32_t fcntlrights)
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{
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if (cap_fcntls_limit(fd, fcntlrights) < 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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__END_DECLS
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#endif /* _CAPSICUM_HELPERS_H_ */
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