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Introduce caph_enter and caph_enter_casper.

Browse source 
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
This commit is contained in:
Mariusz Zaborski 2018-05-07 20:38:09 +00:00
parent 1f7ce05d1d
commit cfb13e0a97
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=333330
2 changed files with 38 additions and 1 deletions
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19
lib/libcapsicum/capsicum_helpers.3
View file

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd October 21, 2016
.Dd May 7, 2018
.Dt CAPSICUM_HELPERS 3
.Os
.Sh NAME
@ -41,6 +41,10 @@
.Sh SYNOPSIS
.In capsicum_helpers.h
.Ft int
.Fn caph_enter "void"
.Ft int
.Fn caph_enter_casper "void"
.Ft int
.Fn caph_limit_stream "int fd, int flags"
.Ft int
.Fn caph_limit_stdin "void"
@ -56,6 +60,19 @@
.Fn caph_cache_catpages "void"
.Sh DESCRIPTION
The
.Nm caph_enter
is equivalent to the
.Xr cap_enter 2
it returns success when the kernel is built without support of the capability
mode.
.Pp
The
.Nm caph_enter_casper
is equivalent to the
.Nm caph_enter
it returns success when the system is built without Casper support.
.Pp
The
.Nm capsicum helpers
are a set of a inline functions which simplify modifying programs to use
Capsicum.

20
lib/libcapsicum/capsicum_helpers.h
View file

@ -39,6 +39,8 @@
#include <time.h>
#include <unistd.h>
#include <libcasper.h>
#define CAPH_IGNORE_EBADF 0x0001
#define CAPH_READ 0x0002
#define CAPH_WRITE 0x0004
@ -122,4 +124,22 @@ caph_cache_catpages(void)
(void)catopen("libc", NL_CAT_LOCALE);
}
static __inline int
caph_enter(void)
{
if (cap_enter() < 0 && errno != ENOSYS)
return (-1);
return (0);
}
static __inline int
caph_enter_casper(void)
{
return (CASPER_SUPPORT == 0 ? 0 : caph_enter());
}
#endif /* _CAPSICUM_HELPERS_H_ */