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authorMariusz Zaborski <oshogbo@FreeBSD.org>2016-10-03 20:48:18 +0000
committerMariusz Zaborski <oshogbo@FreeBSD.org>2016-10-03 20:48:18 +0000
commit7a6e3cf83ebd7d3a7611b26234d12a92bb0d463e (patch)
tree770646e687da603bc139ae5823a5cf2d1d462177 /lib/libcapsicum/capsicum_helpers.h
parentc6b8d2a2a3884a2bac85c751ba0c9f3eecf5e5ff (diff)
downloadsrc-7a6e3cf83ebd7d3a7611b26234d12a92bb0d463e.tar.gz
src-7a6e3cf83ebd7d3a7611b26234d12a92bb0d463e.zip
libcapsicum: introduce Capsicum helpers
Capsicum helpers are a set of inline functions which goal is to reduce duplicated patterns used to Capsicumize applications. Reviewed by: cem, AllanJude, bapt, ed, emaste Differential Revision: https://reviews.freebsd.org/D8013
Notes
Notes: svn path=/head/; revision=306657
Diffstat (limited to 'lib/libcapsicum/capsicum_helpers.h')
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diff --git a/lib/libcapsicum/capsicum_helpers.h b/lib/libcapsicum/capsicum_helpers.h
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+/*-
+ * Copyright (c) 2016 Mariusz Zaborski <oshogbo@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _CAPSICUM_HELPERS_H_
+#define _CAPSICUM_HELPERS_H_
+
+#include <sys/param.h>
+#include <sys/capsicum.h>
+
+#include <errno.h>
+#include <nl_types.h>
+#include <termios.h>
+#include <time.h>
+#include <unistd.h>
+
+#define CAPH_IGNORE_EBADF 0x0001
+#define CAPH_READ 0x0002
+#define CAPH_WRITE 0x0004
+
+static __inline int
+caph_limit_stream(int fd, int flags)
+{
+ cap_rights_t rights;
+ unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ };
+
+ cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_IOCTL);
+
+ if ((flags & CAPH_READ) != 0)
+ cap_rights_set(&rights, CAP_READ);
+ if ((flags & CAPH_WRITE) != 0)
+ cap_rights_set(&rights, CAP_WRITE);
+
+ if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
+ if (errno == EBADF && (flags & CAPH_IGNORE_EBADF) != 0)
+ return (0);
+ return (-1);
+ }
+
+ if (cap_ioctls_limit(fd, cmds, nitems(cmds)) < 0 && errno != ENOSYS)
+ return (-1);
+
+ if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS)
+ return (-1);
+
+ return (0);
+}
+
+static __inline int
+caph_limit_stdin(void)
+{
+
+ return (caph_limit_stream(STDIN_FILENO, CAPH_READ));
+}
+
+static __inline int
+caph_limit_stderr(void)
+{
+
+ return (caph_limit_stream(STDERR_FILENO, CAPH_WRITE));
+}
+
+static __inline int
+caph_limit_stdout(void)
+{
+
+ return (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE));
+}
+
+static __inline int
+caph_limit_stdio(void)
+{
+
+ if (caph_limit_stdin() == -1 || caph_limit_stdout() == -1 ||
+ caph_limit_stdout() == -1) {
+ return (-1);
+ }
+
+ return (0);
+}
+
+static __inline void
+caph_cache_tzdata(void)
+{
+
+ tzset();
+}
+
+static __inline void
+caph_cache_catpages(void)
+{
+
+ (void)catopen("libc", NL_CAT_LOCALE);
+}
+
+#endif /* _CAPSICUM_HELPERS_H_ */