mac_partition.c revision 106393
1105828Srwatson/*- 2105828Srwatson * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson 3105828Srwatson * 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 106393 2002-11-04 01:53:12Z 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/mac.h> 47105828Srwatson#include <sys/mount.h> 48105828Srwatson#include <sys/proc.h> 49105828Srwatson#include <sys/systm.h> 50105828Srwatson#include <sys/sysproto.h> 51105828Srwatson#include <sys/sysent.h> 52105828Srwatson#include <sys/vnode.h> 53105828Srwatson#include <sys/file.h> 54105828Srwatson#include <sys/socket.h> 55105828Srwatson#include <sys/socketvar.h> 56105828Srwatson#include <sys/sysctl.h> 57105828Srwatson 58105828Srwatson#include <fs/devfs/devfs.h> 59105828Srwatson 60105828Srwatson#include <net/bpfdesc.h> 61105828Srwatson#include <net/if.h> 62105828Srwatson#include <net/if_types.h> 63105828Srwatson#include <net/if_var.h> 64105828Srwatson 65105828Srwatson#include <vm/vm.h> 66105828Srwatson 67105828Srwatson#include <sys/mac_policy.h> 68105828Srwatson 69105828Srwatson#include <security/mac_partition/mac_partition.h> 70105828Srwatson 71105828SrwatsonSYSCTL_DECL(_security_mac); 72105828Srwatson 73105828SrwatsonSYSCTL_NODE(_security_mac, OID_AUTO, partition, CTLFLAG_RW, 0, 74105828Srwatson "TrustedBSD mac_partition policy controls"); 75105828Srwatson 76105828Srwatsonstatic int mac_partition_enabled = 1; 77105828SrwatsonSYSCTL_INT(_security_mac_partition, OID_AUTO, enabled, CTLFLAG_RW, 78105828Srwatson &mac_partition_enabled, 0, "Enforce partition policy"); 79105828Srwatson 80105828Srwatsonstatic int partition_slot; 81105828Srwatson#define SLOT(l) (LABEL_TO_SLOT((l), partition_slot).l_long) 82105828Srwatson 83105828Srwatsonstatic void 84105828Srwatsonmac_partition_init(struct mac_policy_conf *conf) 85105828Srwatson{ 86105828Srwatson 87105828Srwatson} 88105828Srwatson 89105828Srwatsonstatic void 90105828Srwatsonmac_partition_init_label(struct label *label) 91105828Srwatson{ 92105828Srwatson 93105828Srwatson SLOT(label) = 0; 94105828Srwatson} 95105828Srwatson 96105828Srwatsonstatic void 97105828Srwatsonmac_partition_destroy_label(struct label *label) 98105828Srwatson{ 99105828Srwatson 100105828Srwatson SLOT(label) = 0; 101105828Srwatson} 102105828Srwatson 103105828Srwatsonstatic int 104105828Srwatsonmac_partition_externalize_label(struct label *label, char *element_name, 105105828Srwatson char *element_data, size_t size, size_t *len, int *claimed) 106105828Srwatson{ 107105828Srwatson 108105828Srwatson if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) 109105828Srwatson return (0); 110105828Srwatson 111105828Srwatson (*claimed)++; 112105828Srwatson *len = snprintf(element_data, size, "%ld", SLOT(label)); 113105828Srwatson return (0); 114105828Srwatson} 115105828Srwatson 116105828Srwatsonstatic int 117105828Srwatsonmac_partition_internalize_label(struct label *label, char *element_name, 118105828Srwatson char *element_data, int *claimed) 119105828Srwatson{ 120105828Srwatson 121105828Srwatson if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) 122105828Srwatson return (0); 123105828Srwatson 124105828Srwatson (*claimed)++; 125105828Srwatson SLOT(label) = strtol(element_data, NULL, 10); 126105828Srwatson return (0); 127105828Srwatson} 128105828Srwatson 129105828Srwatsonstatic void 130105828Srwatsonmac_partition_create_cred(struct ucred *cred_parent, struct ucred *cred_child) 131105828Srwatson{ 132105828Srwatson 133105828Srwatson SLOT(&cred_child->cr_label) = SLOT(&cred_parent->cr_label); 134105828Srwatson} 135105828Srwatson 136105828Srwatsonstatic void 137105828Srwatsonmac_partition_create_proc0(struct ucred *cred) 138105828Srwatson{ 139105828Srwatson 140105828Srwatson SLOT(&cred->cr_label) = 0; 141105828Srwatson} 142105828Srwatson 143105828Srwatsonstatic void 144105828Srwatsonmac_partition_create_proc1(struct ucred *cred) 145105828Srwatson{ 146105828Srwatson 147105828Srwatson SLOT(&cred->cr_label) = 0; 148105828Srwatson} 149105828Srwatson 150105828Srwatsonstatic void 151105828Srwatsonmac_partition_relabel_cred(struct ucred *cred, struct label *newlabel) 152105828Srwatson{ 153105828Srwatson 154105828Srwatson if (SLOT(newlabel) != 0) 155105828Srwatson SLOT(&cred->cr_label) = SLOT(newlabel); 156105828Srwatson} 157105828Srwatson 158105828Srwatsonstatic int 159105828Srwatsonlabel_on_label(struct label *subject, struct label *object) 160105828Srwatson{ 161105828Srwatson 162105828Srwatson if (mac_partition_enabled == 0) 163105828Srwatson return (0); 164105828Srwatson 165105828Srwatson if (SLOT(subject) == 0) 166105828Srwatson return (0); 167105828Srwatson 168105828Srwatson if (SLOT(subject) == SLOT(object)) 169105828Srwatson return (0); 170105828Srwatson 171105828Srwatson return (EPERM); 172105828Srwatson} 173105828Srwatson 174105828Srwatsonstatic int 175105828Srwatsonmac_partition_check_cred_relabel(struct ucred *cred, struct label *newlabel) 176105828Srwatson{ 177105828Srwatson int error; 178105828Srwatson 179105828Srwatson error = 0; 180105828Srwatson 181105828Srwatson /* Treat "0" as a no-op request. */ 182105828Srwatson if (SLOT(newlabel) != 0) { 183105828Srwatson /* 184106367Srwatson * Require BSD privilege in order to change the partition. 185106367Srwatson * Originally we also required that the process not be 186106367Srwatson * in a partition in the first place, but this didn't 187106367Srwatson * interact well with sendmail. 188105828Srwatson */ 189105828Srwatson error = suser_cred(cred, 0); 190105828Srwatson } 191105828Srwatson 192105828Srwatson return (error); 193105828Srwatson} 194105828Srwatson 195105828Srwatsonstatic int 196105828Srwatsonmac_partition_check_cred_visible(struct ucred *u1, struct ucred *u2) 197105828Srwatson{ 198105828Srwatson int error; 199105828Srwatson 200105828Srwatson error = label_on_label(&u1->cr_label, &u2->cr_label); 201105828Srwatson 202105828Srwatson return (error == 0 ? 0 : ESRCH); 203105828Srwatson} 204105828Srwatson 205105828Srwatsonstatic int 206105828Srwatsonmac_partition_check_proc_debug(struct ucred *cred, struct proc *proc) 207105828Srwatson{ 208105828Srwatson int error; 209105828Srwatson 210105828Srwatson error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label); 211105828Srwatson 212105828Srwatson return (error ? ESRCH : 0); 213105828Srwatson} 214105828Srwatson 215105828Srwatsonstatic int 216105828Srwatsonmac_partition_check_proc_sched(struct ucred *cred, struct proc *proc) 217105828Srwatson{ 218105828Srwatson int error; 219105828Srwatson 220105828Srwatson error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label); 221105828Srwatson 222105828Srwatson return (error ? ESRCH : 0); 223105828Srwatson} 224105828Srwatson 225105828Srwatsonstatic int 226105828Srwatsonmac_partition_check_proc_signal(struct ucred *cred, struct proc *proc, 227105828Srwatson int signum) 228105828Srwatson{ 229105828Srwatson int error; 230105828Srwatson 231105828Srwatson error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label); 232105828Srwatson 233105828Srwatson return (error ? ESRCH : 0); 234105828Srwatson} 235105828Srwatson 236105828Srwatsonstatic int 237105828Srwatsonmac_partition_check_socket_visible(struct ucred *cred, struct socket *socket, 238105828Srwatson struct label *socketlabel) 239105828Srwatson{ 240105828Srwatson int error; 241105828Srwatson 242105828Srwatson error = label_on_label(&cred->cr_label, socketlabel); 243105828Srwatson 244105828Srwatson return (error ? ENOENT : 0); 245105828Srwatson} 246105828Srwatson 247106217Srwatsonstatic struct mac_policy_ops mac_partition_ops = 248105828Srwatson{ 249106217Srwatson .mpo_init = mac_partition_init, 250106217Srwatson .mpo_init_cred_label = mac_partition_init_label, 251106217Srwatson .mpo_destroy_cred_label = mac_partition_destroy_label, 252106217Srwatson .mpo_externalize_cred_label = mac_partition_externalize_label, 253106217Srwatson .mpo_internalize_cred_label = mac_partition_internalize_label, 254106217Srwatson .mpo_create_cred = mac_partition_create_cred, 255106217Srwatson .mpo_create_proc0 = mac_partition_create_proc0, 256106217Srwatson .mpo_create_proc1 = mac_partition_create_proc1, 257106217Srwatson .mpo_relabel_cred = mac_partition_relabel_cred, 258106217Srwatson .mpo_check_cred_relabel = mac_partition_check_cred_relabel, 259106217Srwatson .mpo_check_cred_visible = mac_partition_check_cred_visible, 260106217Srwatson .mpo_check_proc_debug = mac_partition_check_proc_debug, 261106217Srwatson .mpo_check_proc_sched = mac_partition_check_proc_sched, 262106217Srwatson .mpo_check_proc_signal = mac_partition_check_proc_signal, 263106217Srwatson .mpo_check_socket_visible = mac_partition_check_socket_visible, 264105828Srwatson}; 265105828Srwatson 266106217SrwatsonMAC_POLICY_SET(&mac_partition_ops, trustedbsd_mac_partition, 267105828Srwatson "TrustedBSD MAC/Partition", MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot); 268