mac_partition.c revision 116701
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 116701 2003-06-23 01:26:34Z 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> 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> 57105828Srwatson#include <sys/sysctl.h> 58105828Srwatson 59105828Srwatson#include <fs/devfs/devfs.h> 60105828Srwatson 61105828Srwatson#include <net/bpfdesc.h> 62105828Srwatson#include <net/if.h> 63105828Srwatson#include <net/if_types.h> 64105828Srwatson#include <net/if_var.h> 65105828Srwatson 66105828Srwatson#include <vm/vm.h> 67105828Srwatson 68105828Srwatson#include <sys/mac_policy.h> 69105828Srwatson 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; 82105828Srwatson#define SLOT(l) (LABEL_TO_SLOT((l), partition_slot).l_long) 83105828Srwatson 84105828Srwatsonstatic void 85105828Srwatsonmac_partition_init(struct mac_policy_conf *conf) 86105828Srwatson{ 87105828Srwatson 88105828Srwatson} 89105828Srwatson 90105828Srwatsonstatic void 91105828Srwatsonmac_partition_init_label(struct label *label) 92105828Srwatson{ 93105828Srwatson 94105828Srwatson SLOT(label) = 0; 95105828Srwatson} 96105828Srwatson 97105828Srwatsonstatic void 98105828Srwatsonmac_partition_destroy_label(struct label *label) 99105828Srwatson{ 100105828Srwatson 101105828Srwatson SLOT(label) = 0; 102105828Srwatson} 103105828Srwatson 104105828Srwatsonstatic int 105105828Srwatsonmac_partition_externalize_label(struct label *label, char *element_name, 106116701Srwatson struct sbuf *sb, int *claimed) 107105828Srwatson{ 108105828Srwatson 109105828Srwatson if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) 110105828Srwatson return (0); 111105828Srwatson 112105828Srwatson (*claimed)++; 113116701Srwatson 114116701Srwatson if (sbuf_printf(sb, "%ld", SLOT(label)) == -1) 115116701Srwatson return (EINVAL); 116116701Srwatson else 117116701Srwatson return (0); 118105828Srwatson} 119105828Srwatson 120105828Srwatsonstatic int 121105828Srwatsonmac_partition_internalize_label(struct label *label, char *element_name, 122105828Srwatson char *element_data, int *claimed) 123105828Srwatson{ 124105828Srwatson 125105828Srwatson if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0) 126105828Srwatson return (0); 127105828Srwatson 128105828Srwatson (*claimed)++; 129105828Srwatson SLOT(label) = strtol(element_data, NULL, 10); 130105828Srwatson return (0); 131105828Srwatson} 132105828Srwatson 133105828Srwatsonstatic void 134105828Srwatsonmac_partition_create_cred(struct ucred *cred_parent, struct ucred *cred_child) 135105828Srwatson{ 136105828Srwatson 137105828Srwatson SLOT(&cred_child->cr_label) = SLOT(&cred_parent->cr_label); 138105828Srwatson} 139105828Srwatson 140105828Srwatsonstatic void 141105828Srwatsonmac_partition_create_proc0(struct ucred *cred) 142105828Srwatson{ 143105828Srwatson 144105828Srwatson SLOT(&cred->cr_label) = 0; 145105828Srwatson} 146105828Srwatson 147105828Srwatsonstatic void 148105828Srwatsonmac_partition_create_proc1(struct ucred *cred) 149105828Srwatson{ 150105828Srwatson 151105828Srwatson SLOT(&cred->cr_label) = 0; 152105828Srwatson} 153105828Srwatson 154105828Srwatsonstatic void 155105828Srwatsonmac_partition_relabel_cred(struct ucred *cred, struct label *newlabel) 156105828Srwatson{ 157105828Srwatson 158105828Srwatson if (SLOT(newlabel) != 0) 159105828Srwatson SLOT(&cred->cr_label) = SLOT(newlabel); 160105828Srwatson} 161105828Srwatson 162105828Srwatsonstatic int 163105828Srwatsonlabel_on_label(struct label *subject, struct label *object) 164105828Srwatson{ 165105828Srwatson 166105828Srwatson if (mac_partition_enabled == 0) 167105828Srwatson return (0); 168105828Srwatson 169105828Srwatson if (SLOT(subject) == 0) 170105828Srwatson return (0); 171105828Srwatson 172105828Srwatson if (SLOT(subject) == SLOT(object)) 173105828Srwatson return (0); 174105828Srwatson 175105828Srwatson return (EPERM); 176105828Srwatson} 177105828Srwatson 178105828Srwatsonstatic int 179105828Srwatsonmac_partition_check_cred_relabel(struct ucred *cred, struct label *newlabel) 180105828Srwatson{ 181105828Srwatson int error; 182105828Srwatson 183105828Srwatson error = 0; 184105828Srwatson 185105828Srwatson /* Treat "0" as a no-op request. */ 186105828Srwatson if (SLOT(newlabel) != 0) { 187105828Srwatson /* 188106367Srwatson * Require BSD privilege in order to change the partition. 189106367Srwatson * Originally we also required that the process not be 190106367Srwatson * in a partition in the first place, but this didn't 191106367Srwatson * interact well with sendmail. 192105828Srwatson */ 193105828Srwatson error = suser_cred(cred, 0); 194105828Srwatson } 195105828Srwatson 196105828Srwatson return (error); 197105828Srwatson} 198105828Srwatson 199105828Srwatsonstatic int 200105828Srwatsonmac_partition_check_cred_visible(struct ucred *u1, struct ucred *u2) 201105828Srwatson{ 202105828Srwatson int error; 203105828Srwatson 204105828Srwatson error = label_on_label(&u1->cr_label, &u2->cr_label); 205105828Srwatson 206105828Srwatson return (error == 0 ? 0 : ESRCH); 207105828Srwatson} 208105828Srwatson 209105828Srwatsonstatic int 210105828Srwatsonmac_partition_check_proc_debug(struct ucred *cred, struct proc *proc) 211105828Srwatson{ 212105828Srwatson int error; 213105828Srwatson 214105828Srwatson error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label); 215105828Srwatson 216105828Srwatson return (error ? ESRCH : 0); 217105828Srwatson} 218105828Srwatson 219105828Srwatsonstatic int 220105828Srwatsonmac_partition_check_proc_sched(struct ucred *cred, struct proc *proc) 221105828Srwatson{ 222105828Srwatson int error; 223105828Srwatson 224105828Srwatson error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label); 225105828Srwatson 226105828Srwatson return (error ? ESRCH : 0); 227105828Srwatson} 228105828Srwatson 229105828Srwatsonstatic int 230105828Srwatsonmac_partition_check_proc_signal(struct ucred *cred, struct proc *proc, 231105828Srwatson int signum) 232105828Srwatson{ 233105828Srwatson int error; 234105828Srwatson 235105828Srwatson error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label); 236105828Srwatson 237105828Srwatson return (error ? ESRCH : 0); 238105828Srwatson} 239105828Srwatson 240105828Srwatsonstatic int 241105828Srwatsonmac_partition_check_socket_visible(struct ucred *cred, struct socket *socket, 242105828Srwatson struct label *socketlabel) 243105828Srwatson{ 244105828Srwatson int error; 245105828Srwatson 246105828Srwatson error = label_on_label(&cred->cr_label, socketlabel); 247105828Srwatson 248105828Srwatson return (error ? ENOENT : 0); 249105828Srwatson} 250105828Srwatson 251106648Srwatsonstatic int 252106648Srwatsonmac_partition_check_vnode_exec(struct ucred *cred, struct vnode *vp, 253106648Srwatson struct label *label, struct image_params *imgp, struct label *execlabel) 254106648Srwatson{ 255106648Srwatson 256106648Srwatson if (execlabel != NULL) { 257106648Srwatson /* 258106648Srwatson * We currently don't permit labels to be changed at 259106648Srwatson * exec-time as part of the partition model, so disallow 260106648Srwatson * non-NULL partition label changes in execlabel. 261106648Srwatson */ 262106648Srwatson if (SLOT(execlabel) != 0) 263106648Srwatson return (EINVAL); 264106648Srwatson } 265106648Srwatson 266106648Srwatson return (0); 267106648Srwatson} 268106648Srwatson 269106217Srwatsonstatic struct mac_policy_ops mac_partition_ops = 270105828Srwatson{ 271106217Srwatson .mpo_init = mac_partition_init, 272106217Srwatson .mpo_init_cred_label = mac_partition_init_label, 273106217Srwatson .mpo_destroy_cred_label = mac_partition_destroy_label, 274106217Srwatson .mpo_externalize_cred_label = mac_partition_externalize_label, 275106217Srwatson .mpo_internalize_cred_label = mac_partition_internalize_label, 276106217Srwatson .mpo_create_cred = mac_partition_create_cred, 277106217Srwatson .mpo_create_proc0 = mac_partition_create_proc0, 278106217Srwatson .mpo_create_proc1 = mac_partition_create_proc1, 279106217Srwatson .mpo_relabel_cred = mac_partition_relabel_cred, 280106217Srwatson .mpo_check_cred_relabel = mac_partition_check_cred_relabel, 281106217Srwatson .mpo_check_cred_visible = mac_partition_check_cred_visible, 282106217Srwatson .mpo_check_proc_debug = mac_partition_check_proc_debug, 283106217Srwatson .mpo_check_proc_sched = mac_partition_check_proc_sched, 284106217Srwatson .mpo_check_proc_signal = mac_partition_check_proc_signal, 285106217Srwatson .mpo_check_socket_visible = mac_partition_check_socket_visible, 286106648Srwatson .mpo_check_vnode_exec = mac_partition_check_vnode_exec, 287105828Srwatson}; 288105828Srwatson 289112717SrwatsonMAC_POLICY_SET(&mac_partition_ops, mac_partition, "TrustedBSD MAC/Partition", 290112717Srwatson MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot); 291