0309554711
returning anything but EPERM. o suser is enabled by default; once disabled, cannot be reenabled o To be used in alternative security models where uid0 does not connote additional privileges o Should be noted that uid0 still has some additional powers as it owns many important files and executables, so suffers from the same fundamental security flaws as securelevels. This is fixed with MAC integrity protection code (in progress) o Not safe for consumption unless you are *really* sure you don't want things like shutdown to work, et al :-) Obtained from: TrustedBSD Project
280 lines
10 KiB
C
280 lines
10 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Karels at Berkeley Software Design, Inc.
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*
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* Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
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* project, to make these variables more userfriendly.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/jail.h>
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#include <machine/smp.h>
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SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
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"Sysctl internal magic");
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SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
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"High kernel, proc, limits &c");
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SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
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"Virtual memory");
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SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
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"File system");
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SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
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"Network, (see socket.h)");
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SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
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"Debugging");
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SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
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"Sizeof various things");
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SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
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"hardware");
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SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
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"machine dependent");
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SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
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"user-level");
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SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
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"p1003_1b, (see p1003_1b.h)");
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SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
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"Compatibility code");
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SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
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osrelease, 0, "Operating system type");
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SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
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0, BSD, "Operating system revision");
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SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
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version, 0, "Kernel version");
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SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
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ostype, 0, "Operating system type");
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extern int osreldate;
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SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
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&osreldate, 0, "Operating system release date");
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SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD,
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&maxproc, 0, "Maximum number of processes");
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SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
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&maxprocperuid, 0, "Maximum processes allowed per userid");
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SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
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0, ARG_MAX, "Maximum bytes of argument to execve(2)");
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SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
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0, _KPOSIX_VERSION, "Version of POSIX attempting to comply to");
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SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
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0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
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SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
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0, 1, "Whether job control is available");
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#ifdef _POSIX_SAVED_IDS
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SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
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0, 1, "Whether saved set-group/user ID is available");
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#else
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SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
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0, 0, "Whether saved set-group/user ID is available");
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#endif
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char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
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SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
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kernelname, sizeof kernelname, "Name of kernel file booted");
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#ifdef SMP
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SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
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&mp_ncpus, 0, "Number of active CPUs");
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#else
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SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
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0, 1, "Number of active CPUs");
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#endif
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SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
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0, BYTE_ORDER, "System byte order");
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SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
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0, PAGE_SIZE, "System memory page size");
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static char machine_arch[] = MACHINE_ARCH;
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SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
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machine_arch, 0, "System architecture");
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char hostname[MAXHOSTNAMELEN];
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static int
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sysctl_hostname SYSCTL_HANDLER_ARGS
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{
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int error;
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if (req->p->p_prison) {
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if (!jail_set_hostname_allowed && req->newptr)
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return(EPERM);
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error = sysctl_handle_string(oidp,
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req->p->p_prison->pr_host,
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sizeof req->p->p_prison->pr_host, req);
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} else
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error = sysctl_handle_string(oidp,
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hostname, sizeof hostname, req);
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return (error);
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}
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SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
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CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
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0, 0, sysctl_hostname, "A", "Hostname");
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int securelevel = -1;
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static int
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sysctl_kern_securelvl SYSCTL_HANDLER_ARGS
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{
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int error, level;
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level = securelevel;
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error = sysctl_handle_int(oidp, &level, 0, req);
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if (error || !req->newptr)
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return (error);
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if (level < securelevel)
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return (EPERM);
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securelevel = level;
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return (error);
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}
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SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW,
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0, 0, sysctl_kern_securelvl, "I", "Current secure level");
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int suser_permitted = 1;
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static int
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sysctl_kern_suser_permitted SYSCTL_HANDLER_ARGS
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{
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int error, flag;
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flag = suser_permitted;
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error = sysctl_handle_int(oidp, &flag, 0, req);
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if (error || !req->newptr)
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return (error);
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if (flag != 0 && flag != 1)
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return(EPERM);
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if (!suser_permitted)
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return(EPERM);
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suser_permitted = flag;
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return (0);
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}
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SYSCTL_PROC(_kern, OID_AUTO, suser_permitted,
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CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_kern_suser_permitted, "I",
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"processes with uid 0 have privilege");
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char domainname[MAXHOSTNAMELEN];
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SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
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&domainname, sizeof(domainname), "Name of the current YP/NIS domain");
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long hostid;
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/* Some trouble here, if sizeof (int) != sizeof (long) */
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SYSCTL_INT(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
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/*
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* This is really cheating. These actually live in the libc, something
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* which I'm not quite sure is a good idea anyway, but in order for
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* getnext and friends to actually work, we define dummies here.
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*/
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SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
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"", 0, "PATH that finds all the standard utilities");
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SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
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0, 0, "Max ibase/obase values in bc(1)");
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SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
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0, 0, "Max array size in bc(1)");
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SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
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0, 0, "Max scale value in bc(1)");
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SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
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0, 0, "Max string length in bc(1)");
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SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
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0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
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SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
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SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
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0, 0, "Max length (bytes) of a text-processing utility's input line");
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SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
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0, 0, "Maximum number of repeats of a regexp permitted");
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SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
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0, 0,
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"The version of POSIX 1003.2 with which the system attempts to comply");
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SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
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0, 0, "Whether C development supports the C bindings option");
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SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
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0, 0, "Whether system supports the C development utilities option");
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SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
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0, 0, "");
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SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
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0, 0, "Whether system supports FORTRAN development utilities");
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SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
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0, 0, "Whether system supports FORTRAN runtime utilities");
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SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
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0, 0, "Whether system supports creation of locales");
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SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
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0, 0, "Whether system supports software development utilities");
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SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
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0, 0, "Whether system supports the user portability utilities");
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SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
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0, 0, "Min Maximum number of streams a process may have open at one time");
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SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
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0, 0, "Min Maximum number of types supported for timezone names");
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#include <sys/vnode.h>
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SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
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0, sizeof(struct vnode), "sizeof(struct vnode)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
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0, sizeof(struct proc), "sizeof(struct proc)");
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#include <sys/conf.h>
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SYSCTL_INT(_debug_sizeof, OID_AUTO, specinfo, CTLFLAG_RD,
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0, sizeof(struct specinfo), "sizeof(struct specinfo)");
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#include <sys/bio.h>
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#include <sys/buf.h>
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SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
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0, sizeof(struct bio), "sizeof(struct bio)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
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0, sizeof(struct buf), "sizeof(struct buf)");
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