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mac_seeotheruids.c
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Editing: mac_seeotheruids.c
/*- * Copyright (c) 1999-2002, 2007 Robert N. M. Watson * Copyright (c) 2001-2002 Networks Associates Technology, Inc. * Copyright (c) 2006 SPARTA, Inc. * All rights reserved. * * This software was developed by Robert Watson for the TrustedBSD Project. * * This software was developed for the FreeBSD Project in part by Network * Associates Laboratories, the Security Research Division of Network * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), * as part of the DARPA CHATS research program. * * This software was enhanced by SPARTA ISSO under SPAWAR contract * N66001-04-C-6019 ("SEFOS"). * * 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. * * $FreeBSD$ */ /* * Developed by the TrustedBSD Project. * * Prevent processes owned by a particular uid from seeing various transient * kernel objects associated with other uids. */ #include <sys/param.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/systm.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/sysctl.h> #include <net/route.h> #include <netinet/in.h> #include <netinet/in_pcb.h> #include <security/mac/mac_policy.h> SYSCTL_DECL(_security_mac); static SYSCTL_NODE(_security_mac, OID_AUTO, seeotheruids, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "TrustedBSD mac_seeotheruids policy controls"); static int seeotheruids_enabled = 1; SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, enabled, CTLFLAG_RW, &seeotheruids_enabled, 0, "Enforce seeotheruids policy"); /* * Exception: allow credentials to be aware of other credentials with the * same primary gid. */ static int primarygroup_enabled = 0; SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, primarygroup_enabled, CTLFLAG_RW, &primarygroup_enabled, 0, "Make an exception for credentials " "with the same real primary group id"); /* * Exception: allow the root user to be aware of other credentials by virtue * of privilege. */ static int suser_privileged = 1; SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, suser_privileged, CTLFLAG_RW, &suser_privileged, 0, "Make an exception for superuser"); /* * Exception: allow processes with a specific gid to be exempt from the * policy. One sysctl enables this functionality; the other sets the * exempt gid. */ static int specificgid_enabled = 0; SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid_enabled, CTLFLAG_RW, &specificgid_enabled, 0, "Make an exception for credentials " "with a specific gid as their real primary group id or group set"); static gid_t specificgid = 0; SYSCTL_UINT(_security_mac_seeotheruids, OID_AUTO, specificgid, CTLFLAG_RW, &specificgid, 0, "Specific gid to be exempt from seeotheruids policy"); static int seeotheruids_check(struct ucred *cr1, struct ucred *cr2) { if (!seeotheruids_enabled) return (0); if (primarygroup_enabled) { if (cr1->cr_rgid == cr2->cr_rgid) return (0); } if (specificgid_enabled) { if (cr1->cr_rgid == specificgid || groupmember(specificgid, cr1)) return (0); } if (cr1->cr_ruid == cr2->cr_ruid) return (0); if (suser_privileged) { if (priv_check_cred(cr1, PRIV_SEEOTHERUIDS) == 0) return (0); } return (ESRCH); } static int seeotheruids_proc_check_debug(struct ucred *cred, struct proc *p) { return (seeotheruids_check(cred, p->p_ucred)); } static int seeotheruids_proc_check_sched(struct ucred *cred, struct proc *p) { return (seeotheruids_check(cred, p->p_ucred)); } static int seeotheruids_proc_check_signal(struct ucred *cred, struct proc *p, int signum) { return (seeotheruids_check(cred, p->p_ucred)); } static int seeotheruids_cred_check_visible(struct ucred *cr1, struct ucred *cr2) { return (seeotheruids_check(cr1, cr2)); } static int seeotheruids_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, struct label *inplabel) { return (seeotheruids_check(cred, inp->inp_cred)); } static int seeotheruids_socket_check_visible(struct ucred *cred, struct socket *so, struct label *solabel) { return (seeotheruids_check(cred, so->so_cred)); } static struct mac_policy_ops seeotheruids_ops = { .mpo_proc_check_debug = seeotheruids_proc_check_debug, .mpo_proc_check_sched = seeotheruids_proc_check_sched, .mpo_proc_check_signal = seeotheruids_proc_check_signal, .mpo_cred_check_visible = seeotheruids_cred_check_visible, .mpo_inpcb_check_visible = seeotheruids_inpcb_check_visible, .mpo_socket_check_visible = seeotheruids_socket_check_visible, }; MAC_POLICY_SET(&seeotheruids_ops, mac_seeotheruids, "TrustedBSD MAC/seeotheruids", MPC_LOADTIME_FLAG_UNLOADOK, NULL);
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