libcapsicum: Introduce caph_{rights,ioctls,fcntls}_limit
The idea behind those functions is not to force consumers to remember that there is a need to check errno on failure. We already have a caph_enter(3) function which does the same for cap_enter(2). MFC after: 2 weeks
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=340130
@ -8,6 +8,7 @@ MAN+= capsicum_helpers.3
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MLINKS+=capsicum_helpers.3 caph_enter.3
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MLINKS+=capsicum_helpers.3 caph_enter.3
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MLINKS+=capsicum_helpers.3 caph_enter_casper.3
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MLINKS+=capsicum_helpers.3 caph_enter_casper.3
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MLINKS+=capsicum_helpers.3 caph_rights_limit.3
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MLINKS+=capsicum_helpers.3 caph_limit_stream.3
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MLINKS+=capsicum_helpers.3 caph_limit_stream.3
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MLINKS+=capsicum_helpers.3 caph_limit_stdin.3
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MLINKS+=capsicum_helpers.3 caph_limit_stdin.3
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MLINKS+=capsicum_helpers.3 caph_limit_stderr.3
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MLINKS+=capsicum_helpers.3 caph_limit_stderr.3
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@ -24,7 +24,7 @@
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.\"
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.\"
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.\" $FreeBSD$
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.\" $FreeBSD$
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.\"
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.\"
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.Dd July 18, 2018
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.Dd November 4, 2018
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.Dt CAPSICUM_HELPERS 3
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.Dt CAPSICUM_HELPERS 3
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.Os
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.Os
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.Sh NAME
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.Sh NAME
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@ -34,7 +34,12 @@
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.Nm caph_limit_stdout ,
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.Nm caph_limit_stdout ,
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.Nm caph_limit_stdio ,
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.Nm caph_limit_stdio ,
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.Nm caph_cache_tzdata ,
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.Nm caph_cache_tzdata ,
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.Nm caph_cache_catpages
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.Nm caph_cache_catpages ,
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.Nm caph_enter ,
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.Nm caph_enter_casper ,
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.Nm caph_rights_limit ,
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.Nm caph_ioctls_limit ,
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.Nm caph_fcntls_limit
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.Nd "set of the capsicum helpers, part of the libcapsicum"
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.Nd "set of the capsicum helpers, part of the libcapsicum"
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.Sh LIBRARY
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.Sh LIBRARY
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.Lb libcapsicum
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.Lb libcapsicum
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@ -45,7 +50,11 @@
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.Ft int
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.Ft int
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.Fn caph_enter_casper "void"
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.Fn caph_enter_casper "void"
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.Ft int
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.Ft int
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.Fn caph_limit_stream "int fd" "int flags"
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.Fn caph_rights_limit "inf fd" "const cap_righst_t *rights"
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.Ft int
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.Fn caph_ioctls_limit "inf fd" "const unsigned long *cmds" "size_t ncmds"
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.Ft int
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.Fn caph_fcntls_limit "inf fd" "uint32_t fcntlrights"
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.Ft int
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.Ft int
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.Fn caph_limit_stdin "void"
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.Fn caph_limit_stdin "void"
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.Ft int
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.Ft int
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@ -60,9 +69,17 @@
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.Fn caph_cache_catpages "void"
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.Fn caph_cache_catpages "void"
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.Sh DESCRIPTION
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.Sh DESCRIPTION
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The
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The
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.Nm caph_enter
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.Nm caph_enter ,
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is equivalent to the
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.Nm caph_rights_limit ,
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.Xr cap_enter 2
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.Nm caph_ioctls_limit
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and
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.Nm caph_fcntls_limit
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are respectively equivalent to
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.Xr cap_enter 2 ,
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.Xr cap_rights_limit 2 ,
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.Xr cap_ioctls_limit 2
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and
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.Xr cap_fcntls_limit 2 ,
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it returns success when the kernel is built without support of the capability
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it returns success when the kernel is built without support of the capability
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mode.
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mode.
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.Pp
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.Pp
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@ -125,4 +142,5 @@ among others.
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.Ed
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.Ed
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.Sh SEE ALSO
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.Sh SEE ALSO
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.Xr cap_enter 2 ,
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.Xr cap_enter 2 ,
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.Xr cap_rights_limit 2 ,
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.Xr rights 4
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.Xr rights 4
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@ -136,6 +136,35 @@ caph_enter(void)
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return (0);
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return (0);
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}
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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 (caph_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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static __inline int
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caph_enter_casper(void)
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caph_enter_casper(void)
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