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mac_partition.c
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mac_partition.h
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Editing: mac_partition.c
/*- * Copyright (c) 1999-2002, 2007-2008 Robert N. M. Watson * Copyright (c) 2001-2002 Networks Associates Technology, Inc. * Copyright (c) 2006 SPARTA, Inc. * Copyright (c) 2008 Apple 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. * * Experiment with a partition-like model. */ #include <sys/param.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/sbuf.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/systm.h> #include <sys/sysctl.h> #include <net/route.h> #include <netinet/in.h> #include <netinet/in_pcb.h> #include <security/mac/mac_policy.h> #include <security/mac_partition/mac_partition.h> SYSCTL_DECL(_security_mac); static SYSCTL_NODE(_security_mac, OID_AUTO, partition, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "TrustedBSD mac_partition policy controls"); static int partition_enabled = 1; SYSCTL_INT(_security_mac_partition, OID_AUTO, enabled, CTLFLAG_RW, &partition_enabled, 0, "Enforce partition policy"); static int partition_slot; #define SLOT(l) mac_label_get((l), partition_slot) #define SLOT_SET(l, v) mac_label_set((l), partition_slot, (v)) static int partition_check(struct label *subject, struct label *object) { if (partition_enabled == 0) return (0); if (subject == NULL) return (0); if (SLOT(subject) == 0) return (0); /* * If the object label hasn't been allocated, then it's effectively * not in a partition, and we know the subject is as it has a label * and it's not 0, so reject. */ if (object == NULL) return (EPERM); if (SLOT(subject) == SLOT(object)) return (0); return (EPERM); } /* * Object-specific entry points are sorted alphabetically by object type name * and then by operation. */ static int partition_cred_check_relabel(struct ucred *cred, struct label *newlabel) { int error; error = 0; /* * Treat "0" as a no-op request because it reflects an unset * partition label. If we ever want to support switching back to an * unpartitioned state for a process, we'll need to differentiate the * "not in a partition" and "no partition defined during internalize" * conditions. */ if (SLOT(newlabel) != 0) { /* * Require BSD privilege in order to change the partition. * Originally we also required that the process not be in a * partition in the first place, but this didn't interact * well with sendmail. */ error = priv_check_cred(cred, PRIV_MAC_PARTITION); } return (error); } static int partition_cred_check_visible(struct ucred *cr1, struct ucred *cr2) { int error; error = partition_check(cr1->cr_label, cr2->cr_label); return (error == 0 ? 0 : ESRCH); } static void partition_cred_copy_label(struct label *src, struct label *dest) { if (src != NULL && dest != NULL) SLOT_SET(dest, SLOT(src)); else if (dest != NULL) SLOT_SET(dest, 0); } static void partition_cred_create_init(struct ucred *cred) { SLOT_SET(cred->cr_label, 0); } static void partition_cred_create_swapper(struct ucred *cred) { SLOT_SET(cred->cr_label, 0); } static void partition_cred_destroy_label(struct label *label) { SLOT_SET(label, 0); } static int partition_cred_externalize_label(struct label *label, char *element_name, struct sbuf *sb, int *claimed) { if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) return (0); (*claimed)++; if (label != NULL) { if (sbuf_printf(sb, "%jd", (intmax_t)SLOT(label)) == -1) return (EINVAL); } else { if (sbuf_printf(sb, "0") == -1) return (EINVAL); } return (0); } static void partition_cred_init_label(struct label *label) { SLOT_SET(label, 0); } static int partition_cred_internalize_label(struct label *label, char *element_name, char *element_data, int *claimed) { if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) return (0); (*claimed)++; SLOT_SET(label, strtol(element_data, NULL, 10)); return (0); } static void partition_cred_relabel(struct ucred *cred, struct label *newlabel) { if (newlabel != NULL && SLOT(newlabel) != 0) SLOT_SET(cred->cr_label, SLOT(newlabel)); } static int partition_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, struct label *inplabel) { int error; error = partition_check(cred->cr_label, inp->inp_cred->cr_label); return (error ? ENOENT : 0); } static int partition_proc_check_debug(struct ucred *cred, struct proc *p) { int error; error = partition_check(cred->cr_label, p->p_ucred->cr_label); return (error ? ESRCH : 0); } static int partition_proc_check_sched(struct ucred *cred, struct proc *p) { int error; error = partition_check(cred->cr_label, p->p_ucred->cr_label); return (error ? ESRCH : 0); } static int partition_proc_check_signal(struct ucred *cred, struct proc *p, int signum) { int error; error = partition_check(cred->cr_label, p->p_ucred->cr_label); return (error ? ESRCH : 0); } static int partition_socket_check_visible(struct ucred *cred, struct socket *so, struct label *solabel) { int error; error = partition_check(cred->cr_label, so->so_cred->cr_label); return (error ? ENOENT : 0); } static int partition_vnode_check_exec(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct image_params *imgp, struct label *execlabel) { if (execlabel != NULL) { /* * We currently don't permit labels to be changed at * exec-time as part of the partition model, so disallow * non-NULL partition label changes in execlabel. */ if (SLOT(execlabel) != 0) return (EINVAL); } return (0); } static struct mac_policy_ops partition_ops = { .mpo_cred_check_relabel = partition_cred_check_relabel, .mpo_cred_check_visible = partition_cred_check_visible, .mpo_cred_copy_label = partition_cred_copy_label, .mpo_cred_create_init = partition_cred_create_init, .mpo_cred_create_swapper = partition_cred_create_swapper, .mpo_cred_destroy_label = partition_cred_destroy_label, .mpo_cred_externalize_label = partition_cred_externalize_label, .mpo_cred_init_label = partition_cred_init_label, .mpo_cred_internalize_label = partition_cred_internalize_label, .mpo_cred_relabel = partition_cred_relabel, .mpo_inpcb_check_visible = partition_inpcb_check_visible, .mpo_proc_check_debug = partition_proc_check_debug, .mpo_proc_check_sched = partition_proc_check_sched, .mpo_proc_check_signal = partition_proc_check_signal, .mpo_socket_check_visible = partition_socket_check_visible, .mpo_vnode_check_exec = partition_vnode_check_exec, }; MAC_POLICY_SET(&partition_ops, mac_partition, "TrustedBSD MAC/Partition", MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot);
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