mac_partition.c revision 166533
1105828Srwatson/*- 2166533Srwatson * Copyright (c) 1999-2002, 2007 Robert N. M. Watson 3126097Srwatson * Copyright (c) 2001-2002 Networks Associates Technology, Inc. 4105828Srwatson * All rights reserved. 5105828Srwatson * 6105828Srwatson * This software was developed by Robert Watson for the TrustedBSD Project. 7105828Srwatson * 8106393Srwatson * This software was developed for the FreeBSD Project in part by Network 9106393Srwatson * Associates Laboratories, the Security Research Division of Network 10106393Srwatson * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 11106393Srwatson * as part of the DARPA CHATS research program. 12105828Srwatson * 13105828Srwatson * Redistribution and use in source and binary forms, with or without 14105828Srwatson * modification, are permitted provided that the following conditions 15105828Srwatson * are met: 16105828Srwatson * 1. Redistributions of source code must retain the above copyright 17105828Srwatson * notice, this list of conditions and the following disclaimer. 18105828Srwatson * 2. Redistributions in binary form must reproduce the above copyright 19105828Srwatson * notice, this list of conditions and the following disclaimer in the 20105828Srwatson * documentation and/or other materials provided with the distribution. 21105828Srwatson * 22105828Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23105828Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24105828Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25105828Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26105828Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27105828Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28105828Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29105828Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30105828Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31105828Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32105828Srwatson * SUCH DAMAGE. 33105828Srwatson * 34105828Srwatson * $FreeBSD: head/sys/security/mac_partition/mac_partition.c 166533 2007-02-06 14:19:25Z rwatson $ 35105828Srwatson */ 36105828Srwatson 37105828Srwatson/* 38105828Srwatson * Developed by the TrustedBSD Project. 39105828Srwatson * Experiment with a partition-like model. 40105828Srwatson */ 41105828Srwatson 42105828Srwatson#include <sys/types.h> 43105828Srwatson#include <sys/param.h> 44105828Srwatson#include <sys/conf.h> 45105828Srwatson#include <sys/kernel.h> 46105828Srwatson#include <sys/mount.h> 47164033Srwatson#include <sys/priv.h> 48105828Srwatson#include <sys/proc.h> 49116701Srwatson#include <sys/sbuf.h> 50105828Srwatson#include <sys/systm.h> 51105828Srwatson#include <sys/sysproto.h> 52105828Srwatson#include <sys/sysent.h> 53105828Srwatson#include <sys/vnode.h> 54105828Srwatson#include <sys/file.h> 55105828Srwatson#include <sys/socket.h> 56105828Srwatson#include <sys/socketvar.h> 57150340Sphk#include <sys/sx.h> 58105828Srwatson#include <sys/sysctl.h> 59105828Srwatson 60105828Srwatson#include <fs/devfs/devfs.h> 61105828Srwatson 62105828Srwatson#include <net/bpfdesc.h> 63105828Srwatson#include <net/if.h> 64105828Srwatson#include <net/if_types.h> 65105828Srwatson#include <net/if_var.h> 66105828Srwatson 67105828Srwatson#include <vm/vm.h> 68105828Srwatson 69165469Srwatson#include <security/mac/mac_policy.h> 70105828Srwatson#include <security/mac_partition/mac_partition.h> 71105828Srwatson 72105828SrwatsonSYSCTL_DECL(_security_mac); 73105828Srwatson 74105828SrwatsonSYSCTL_NODE(_security_mac, OID_AUTO, partition, CTLFLAG_RW, 0, 75105828Srwatson "TrustedBSD mac_partition policy controls"); 76105828Srwatson 77105828Srwatsonstatic int mac_partition_enabled = 1; 78105828SrwatsonSYSCTL_INT(_security_mac_partition, OID_AUTO, enabled, CTLFLAG_RW, 79105828Srwatson &mac_partition_enabled, 0, "Enforce partition policy"); 80105828Srwatson 81105828Srwatsonstatic int partition_slot; 82166533Srwatson#define SLOT(l) mac_label_get((l), partition_slot) 83166533Srwatson#define SLOT_SET(l, v) mac_label_set((l), partition_slot, (v)) 84105828Srwatson 85105828Srwatsonstatic void 86105828Srwatsonmac_partition_init(struct mac_policy_conf *conf) 87105828Srwatson{ 88105828Srwatson 89105828Srwatson} 90105828Srwatson 91105828Srwatsonstatic void 92105828Srwatsonmac_partition_init_label(struct label *label) 93105828Srwatson{ 94105828Srwatson 95166533Srwatson SLOT_SET(label, 0); 96105828Srwatson} 97105828Srwatson 98105828Srwatsonstatic void 99105828Srwatsonmac_partition_destroy_label(struct label *label) 100105828Srwatson{ 101105828Srwatson 102166533Srwatson SLOT_SET(label, 0); 103105828Srwatson} 104105828Srwatson 105123173Srwatsonstatic void 106123173Srwatsonmac_partition_copy_label(struct label *src, struct label *dest) 107123173Srwatson{ 108123173Srwatson 109166533Srwatson SLOT_SET(dest, SLOT(src)); 110123173Srwatson} 111123173Srwatson 112105828Srwatsonstatic int 113105828Srwatsonmac_partition_externalize_label(struct label *label, char *element_name, 114116701Srwatson struct sbuf *sb, int *claimed) 115105828Srwatson{ 116105828Srwatson 117105828Srwatson if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) 118105828Srwatson return (0); 119105828Srwatson 120105828Srwatson (*claimed)++; 121116701Srwatson 122166533Srwatson if (sbuf_printf(sb, "%d", SLOT(label)) == -1) 123116701Srwatson return (EINVAL); 124116701Srwatson else 125116701Srwatson return (0); 126105828Srwatson} 127105828Srwatson 128105828Srwatsonstatic int 129105828Srwatsonmac_partition_internalize_label(struct label *label, char *element_name, 130105828Srwatson char *element_data, int *claimed) 131105828Srwatson{ 132105828Srwatson 133105828Srwatson if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) 134105828Srwatson return (0); 135105828Srwatson 136105828Srwatson (*claimed)++; 137166533Srwatson SLOT_SET(label, strtol(element_data, NULL, 10)); 138105828Srwatson return (0); 139105828Srwatson} 140105828Srwatson 141105828Srwatsonstatic void 142105828Srwatsonmac_partition_create_proc0(struct ucred *cred) 143105828Srwatson{ 144105828Srwatson 145166533Srwatson SLOT_SET(cred->cr_label, 0); 146105828Srwatson} 147105828Srwatson 148105828Srwatsonstatic void 149105828Srwatsonmac_partition_create_proc1(struct ucred *cred) 150105828Srwatson{ 151105828Srwatson 152166533Srwatson SLOT_SET(cred->cr_label, 0); 153105828Srwatson} 154105828Srwatson 155105828Srwatsonstatic void 156105828Srwatsonmac_partition_relabel_cred(struct ucred *cred, struct label *newlabel) 157105828Srwatson{ 158105828Srwatson 159105828Srwatson if (SLOT(newlabel) != 0) 160166533Srwatson SLOT_SET(cred->cr_label, SLOT(newlabel)); 161105828Srwatson} 162105828Srwatson 163105828Srwatsonstatic int 164105828Srwatsonlabel_on_label(struct label *subject, struct label *object) 165105828Srwatson{ 166105828Srwatson 167105828Srwatson if (mac_partition_enabled == 0) 168105828Srwatson return (0); 169105828Srwatson 170105828Srwatson if (SLOT(subject) == 0) 171105828Srwatson return (0); 172105828Srwatson 173105828Srwatson if (SLOT(subject) == SLOT(object)) 174105828Srwatson return (0); 175105828Srwatson 176105828Srwatson return (EPERM); 177105828Srwatson} 178105828Srwatson 179105828Srwatsonstatic int 180105828Srwatsonmac_partition_check_cred_relabel(struct ucred *cred, struct label *newlabel) 181105828Srwatson{ 182105828Srwatson int error; 183105828Srwatson 184105828Srwatson error = 0; 185105828Srwatson 186105828Srwatson /* Treat "0" as a no-op request. */ 187105828Srwatson if (SLOT(newlabel) != 0) { 188105828Srwatson /* 189106367Srwatson * Require BSD privilege in order to change the partition. 190106367Srwatson * Originally we also required that the process not be 191106367Srwatson * in a partition in the first place, but this didn't 192106367Srwatson * interact well with sendmail. 193105828Srwatson */ 194164033Srwatson error = priv_check_cred(cred, PRIV_MAC_PARTITION, 0); 195105828Srwatson } 196105828Srwatson 197105828Srwatson return (error); 198105828Srwatson} 199105828Srwatson 200105828Srwatsonstatic int 201105828Srwatsonmac_partition_check_cred_visible(struct ucred *u1, struct ucred *u2) 202105828Srwatson{ 203105828Srwatson int error; 204105828Srwatson 205122524Srwatson error = label_on_label(u1->cr_label, u2->cr_label); 206105828Srwatson 207105828Srwatson return (error == 0 ? 0 : ESRCH); 208105828Srwatson} 209105828Srwatson 210105828Srwatsonstatic int 211105828Srwatsonmac_partition_check_proc_debug(struct ucred *cred, struct proc *proc) 212105828Srwatson{ 213105828Srwatson int error; 214105828Srwatson 215122524Srwatson error = label_on_label(cred->cr_label, proc->p_ucred->cr_label); 216105828Srwatson 217105828Srwatson return (error ? ESRCH : 0); 218105828Srwatson} 219105828Srwatson 220105828Srwatsonstatic int 221105828Srwatsonmac_partition_check_proc_sched(struct ucred *cred, struct proc *proc) 222105828Srwatson{ 223105828Srwatson int error; 224105828Srwatson 225122524Srwatson error = label_on_label(cred->cr_label, proc->p_ucred->cr_label); 226105828Srwatson 227105828Srwatson return (error ? ESRCH : 0); 228105828Srwatson} 229105828Srwatson 230105828Srwatsonstatic int 231105828Srwatsonmac_partition_check_proc_signal(struct ucred *cred, struct proc *proc, 232105828Srwatson int signum) 233105828Srwatson{ 234105828Srwatson int error; 235105828Srwatson 236122524Srwatson error = label_on_label(cred->cr_label, proc->p_ucred->cr_label); 237105828Srwatson 238105828Srwatson return (error ? ESRCH : 0); 239105828Srwatson} 240105828Srwatson 241105828Srwatsonstatic int 242105828Srwatsonmac_partition_check_socket_visible(struct ucred *cred, struct socket *socket, 243105828Srwatson struct label *socketlabel) 244105828Srwatson{ 245105828Srwatson int error; 246105828Srwatson 247122524Srwatson error = label_on_label(cred->cr_label, socketlabel); 248105828Srwatson 249105828Srwatson return (error ? ENOENT : 0); 250105828Srwatson} 251105828Srwatson 252106648Srwatsonstatic int 253106648Srwatsonmac_partition_check_vnode_exec(struct ucred *cred, struct vnode *vp, 254106648Srwatson struct label *label, struct image_params *imgp, struct label *execlabel) 255106648Srwatson{ 256106648Srwatson 257106648Srwatson if (execlabel != NULL) { 258106648Srwatson /* 259106648Srwatson * We currently don't permit labels to be changed at 260106648Srwatson * exec-time as part of the partition model, so disallow 261106648Srwatson * non-NULL partition label changes in execlabel. 262106648Srwatson */ 263106648Srwatson if (SLOT(execlabel) != 0) 264106648Srwatson return (EINVAL); 265106648Srwatson } 266106648Srwatson 267106648Srwatson return (0); 268106648Srwatson} 269106648Srwatson 270106217Srwatsonstatic struct mac_policy_ops mac_partition_ops = 271105828Srwatson{ 272106217Srwatson .mpo_init = mac_partition_init, 273106217Srwatson .mpo_init_cred_label = mac_partition_init_label, 274106217Srwatson .mpo_destroy_cred_label = mac_partition_destroy_label, 275123173Srwatson .mpo_copy_cred_label = mac_partition_copy_label, 276106217Srwatson .mpo_externalize_cred_label = mac_partition_externalize_label, 277106217Srwatson .mpo_internalize_cred_label = mac_partition_internalize_label, 278106217Srwatson .mpo_create_proc0 = mac_partition_create_proc0, 279106217Srwatson .mpo_create_proc1 = mac_partition_create_proc1, 280106217Srwatson .mpo_relabel_cred = mac_partition_relabel_cred, 281106217Srwatson .mpo_check_cred_relabel = mac_partition_check_cred_relabel, 282106217Srwatson .mpo_check_cred_visible = mac_partition_check_cred_visible, 283106217Srwatson .mpo_check_proc_debug = mac_partition_check_proc_debug, 284106217Srwatson .mpo_check_proc_sched = mac_partition_check_proc_sched, 285106217Srwatson .mpo_check_proc_signal = mac_partition_check_proc_signal, 286106217Srwatson .mpo_check_socket_visible = mac_partition_check_socket_visible, 287106648Srwatson .mpo_check_vnode_exec = mac_partition_check_vnode_exec, 288105828Srwatson}; 289105828Srwatson 290112717SrwatsonMAC_POLICY_SET(&mac_partition_ops, mac_partition, "TrustedBSD MAC/Partition", 291112717Srwatson MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot); 292