1 /*- 2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson 3 * Copyright (c) 2001, 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed by Robert Watson for the TrustedBSD Project. 7 * 8 * This software was developed for the FreeBSD Project in part by NAI Labs, 9 * the Security Research Division of Network Associates, Inc. under 10 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 11 * CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The names of the authors may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * $FreeBSD$ 38 */ 39 /* 40 * Userland/kernel interface for Mandatory Access Control. 41 * 42 * The POSIX.1e implementation page may be reached at: 43 * http://www.trustedbsd.org/ 44 */ 45 #ifndef _SYS_MAC_H 46 #define _SYS_MAC_H 47 48 #ifndef _POSIX_MAC 49 #define _POSIX_MAC 50 #endif 51 52 /* 53 * XXXMAC: The single MAC extended attribute will be deprecated once 54 * compound EA writes on a single target file can be performed cleanly 55 * with UFS2. 56 */ 57 #define FREEBSD_MAC_EXTATTR_NAME "freebsd.mac" 58 #define FREEBSD_MAC_EXTATTR_NAMESPACE EXTATTR_NAMESPACE_SYSTEM 59 60 /* 61 * XXXMAC: Per-policy structures will be moved from mac.h to per-policy 62 * include files once the revised user interface is available. 63 */ 64 65 /* 66 * Structures and constants associated with a Biba Integrity policy. 67 * mac_biba represents a Biba label, with mb_type determining its properties, 68 * and mb_grade represents the hierarchal grade if valid for the current 69 * mb_type. These structures will move to mac_biba.h once we have dymamic 70 * labels exposed to userland. 71 */ 72 struct mac_biba_element { 73 u_short mbe_type; 74 u_short mbe_grade; 75 }; 76 77 /* 78 * Biba labels consist of two components: a single label, and a label 79 * range. Depending on the context, one or both may be used; the mb_flags 80 * field permits the provider to indicate what fields are intended for 81 * use. 82 */ 83 struct mac_biba { 84 int mb_flags; 85 struct mac_biba_element mb_single; 86 struct mac_biba_element mb_rangelow, mb_rangehigh; 87 }; 88 89 /* 90 * Structures and constants associated with a Multi-Level Security policy. 91 * mac_mls represents an MLS label, with mm_type determining its properties, 92 * and mm_level represents the hierarchal sensitivity level if valid for the 93 * current mm_type. These structures will move to mac_mls.h once we have 94 * dynamic labels exposed to userland. 95 */ 96 struct mac_mls_element { 97 u_short mme_type; 98 u_short mme_level; 99 }; 100 101 /* 102 * MLS labels consist of two components: a single label, and a label 103 * range. Depending on the context, one or both may be used; the mb_flags 104 * field permits the provider to indicate what fields are intended for 105 * use. 106 */ 107 struct mac_mls { 108 int mm_flags; 109 struct mac_mls_element mm_single; 110 struct mac_mls_element mm_rangelow, mm_rangehigh; 111 }; 112 113 /* 114 * Structures and constants associated with a Type Enforcement policy. 115 * mac_te represents a Type Enforcement label. 116 */ 117 #define MAC_TE_TYPE_MAXLEN 32 118 struct mac_te { 119 char mt_type[MAC_TE_TYPE_MAXLEN+1]; /* TE type */ 120 }; 121 122 struct mac_sebsd { 123 uint32_t ms_psid; /* persistent sid storage */ 124 }; 125 126 /* 127 * Composite structures and constants which combine the various policy 128 * elements into common structures to be associated with subjects and 129 * objects. 130 */ 131 struct mac { 132 int m_macflags; 133 struct mac_biba m_biba; 134 struct mac_mls m_mls; 135 struct mac_te m_te; 136 struct mac_sebsd m_sebsd; 137 }; 138 typedef struct mac *mac_t; 139 140 #define MAC_FLAG_INITIALIZED 0x00000001 /* Is initialized. */ 141 142 #ifndef _KERNEL 143 144 /* 145 * POSIX.1e functions visible in the application namespace. 146 */ 147 int mac_dominate(const mac_t _labela, const mac_t _labelb); 148 int mac_equal(const mac_t labela, const mac_t _labelb); 149 int mac_free(void *_buf_p); 150 mac_t mac_from_text(const char *_text_p); 151 mac_t mac_get_fd(int _fildes); 152 mac_t mac_get_file(const char *_path_p); 153 mac_t mac_get_proc(void); 154 mac_t mac_glb(const mac_t _labela, const mac_t _labelb); 155 mac_t mac_lub(const mac_t _labela, const mac_t _labelb); 156 int mac_set_fd(int _fildes, const mac_t _label); 157 int mac_set_file(const char *_path_p, mac_t _label); 158 int mac_set_proc(const mac_t _label); 159 ssize_t mac_size(mac_t _label); 160 char * mac_to_text(const mac_t _label, size_t *_len_p); 161 int mac_valid(const mac_t _label); 162 163 /* 164 * Extensions to POSIX.1e visible in the application namespace. 165 */ 166 int mac_is_present_np(const char *_policyname); 167 int mac_policy(const char *_policyname, int call, void *arg); 168 169 /* 170 * System calls wrapped by some POSIX.1e functions. 171 */ 172 int __mac_get_fd(int _fd, struct mac *_mac_p); 173 int __mac_get_file(const char *_path_p, struct mac *_mac_p); 174 int __mac_get_proc(struct mac *_mac_p); 175 int __mac_set_fd(int fd, struct mac *_mac_p); 176 int __mac_set_file(const char *_path_p, struct mac *_mac_p); 177 int __mac_set_proc(struct mac *_mac_p); 178 179 #else /* _KERNEL */ 180 #endif /* _KERNEL */ 181 182 /* 183 * XXXMAC: This shouldn't be exported to userland, but is because of ucred.h 184 * and various other messes. 185 */ 186 187 #define MAC_MAX_POLICIES 8 188 189 struct label { 190 int l_flags; 191 union { 192 void *l_ptr; 193 long l_long; 194 } l_perpolicy[MAC_MAX_POLICIES]; 195 }; 196 197 #ifdef _KERNEL 198 199 /* 200 * MAC entry point operations 201 */ 202 enum mac_ep_ops { 203 MAC_OP_VNODE_READ, 204 MAC_OP_VNODE_WRITE, 205 MAC_OP_VNODE_POLL, 206 MAC_OP_PIPE_READ, 207 MAC_OP_PIPE_WRITE, 208 MAC_OP_PIPE_STAT, 209 MAC_OP_PIPE_POLL 210 }; 211 212 /* 213 * Kernel functions to manage and evaluate labels. 214 */ 215 struct bpf_d; 216 struct componentname; 217 struct devfs_dirent; 218 struct ifnet; 219 struct ifreq; 220 struct ipq; 221 struct mbuf; 222 struct mount; 223 struct proc; 224 struct sockaddr; 225 struct socket; 226 struct pipe; 227 struct timespec; 228 struct ucred; 229 struct uio; 230 struct vattr; 231 struct vnode; 232 233 #include <sys/acl.h> /* XXX acl_type_t */ 234 235 struct vop_refreshlabel_args; 236 struct vop_setlabel_args; 237 238 /* 239 * Label operations. 240 */ 241 void mac_init_bpfdesc(struct bpf_d *); 242 void mac_init_cred(struct ucred *); 243 void mac_init_devfsdirent(struct devfs_dirent *); 244 void mac_init_ifnet(struct ifnet *); 245 void mac_init_ipq(struct ipq *); 246 void mac_init_socket(struct socket *); 247 void mac_init_pipe(struct pipe *); 248 int mac_init_mbuf(struct mbuf *m, int how); 249 void mac_init_mount(struct mount *); 250 void mac_init_vnode(struct vnode *); 251 void mac_destroy_bpfdesc(struct bpf_d *); 252 void mac_destroy_cred(struct ucred *); 253 void mac_destroy_devfsdirent(struct devfs_dirent *); 254 void mac_destroy_ifnet(struct ifnet *); 255 void mac_destroy_ipq(struct ipq *); 256 void mac_destroy_socket(struct socket *); 257 void mac_destroy_pipe(struct pipe *); 258 void mac_destroy_mbuf(struct mbuf *); 259 void mac_destroy_mount(struct mount *); 260 void mac_destroy_vnode(struct vnode *); 261 262 /* 263 * Labeling event operations: file system objects, and things that 264 * look a lot like file system objects. 265 */ 266 void mac_create_devfs_device(dev_t dev, struct devfs_dirent *de); 267 void mac_create_devfs_directory(char *dirname, int dirnamelen, 268 struct devfs_dirent *de); 269 void mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp); 270 void mac_create_vnode(struct ucred *cred, struct vnode *parent, 271 struct vnode *child); 272 void mac_create_mount(struct ucred *cred, struct mount *mp); 273 void mac_create_root_mount(struct ucred *cred, struct mount *mp); 274 void mac_relabel_vnode(struct ucred *cred, struct vnode *vp, 275 struct label *newlabel); 276 void mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp); 277 void mac_update_procfsvnode(struct vnode *vp, struct ucred *cred); 278 void mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp); 279 280 /* 281 * Labeling event operations: IPC objects. 282 */ 283 void mac_create_mbuf_from_socket(struct socket *so, struct mbuf *m); 284 void mac_create_socket(struct ucred *cred, struct socket *socket); 285 void mac_create_socket_from_socket(struct socket *oldsocket, 286 struct socket *newsocket); 287 void mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, 288 struct socket *socket); 289 void mac_set_socket_peer_from_socket(struct socket *oldsocket, 290 struct socket *newsocket); 291 void mac_create_pipe(struct ucred *cred, struct pipe *pipe); 292 293 /* 294 * Labeling event operations: network objects. 295 */ 296 void mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d); 297 void mac_create_ifnet(struct ifnet *ifp); 298 void mac_create_ipq(struct mbuf *fragment, struct ipq *ipq); 299 void mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram); 300 void mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment); 301 void mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf); 302 void mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *m); 303 void mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *m); 304 void mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *m); 305 void mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, 306 struct ifnet *ifnet, struct mbuf *newmbuf); 307 void mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf); 308 int mac_fragment_match(struct mbuf *fragment, struct ipq *ipq); 309 void mac_update_ipq(struct mbuf *fragment, struct ipq *ipq); 310 311 /* 312 * Labeling event operations: processes. 313 */ 314 void mac_create_cred(struct ucred *cred_parent, struct ucred *cred_child); 315 void mac_execve_transition(struct ucred *old, struct ucred *new, 316 struct vnode *vp); 317 int mac_execve_will_transition(struct ucred *old, struct vnode *vp); 318 void mac_create_proc0(struct ucred *cred); 319 void mac_create_proc1(struct ucred *cred); 320 321 /* Access control checks. */ 322 int mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet); 323 int mac_check_cred_visible(struct ucred *u1, struct ucred *u2); 324 int mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *m); 325 int mac_check_mount_stat(struct ucred *cred, struct mount *mp); 326 int mac_check_pipe_op(struct ucred *cred, struct pipe *pipe, int op); 327 int mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, 328 unsigned long cmd, void *data); 329 int mac_check_proc_debug(struct ucred *cred, struct proc *proc); 330 int mac_check_proc_sched(struct ucred *cred, struct proc *proc); 331 int mac_check_proc_signal(struct ucred *cred, struct proc *proc, 332 int signum); 333 int mac_check_socket_bind(struct ucred *cred, struct socket *so, 334 struct sockaddr *sockaddr); 335 int mac_check_socket_connect(struct ucred *cred, struct socket *so, 336 struct sockaddr *sockaddr); 337 int mac_check_socket_listen(struct ucred *cred, struct socket *so); 338 int mac_check_socket_receive(struct socket *so, struct mbuf *m); 339 int mac_check_socket_visible(struct ucred *cred, struct socket *so); 340 int mac_check_vnode_access(struct ucred *cred, struct vnode *vp, 341 int flags); 342 int mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp); 343 int mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp); 344 int mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 345 struct componentname *cnp, struct vattr *vap); 346 int mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, 347 struct vnode *vp, struct componentname *cnp); 348 int mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 349 acl_type_t type); 350 int mac_check_vnode_exec(struct ucred *cred, struct vnode *vp); 351 int mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, 352 acl_type_t type); 353 int mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 354 int attrnamespace, const char *name, struct uio *uio); 355 int mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 356 struct componentname *cnp); 357 /* XXX This u_char should be vm_prot_t! */ 358 u_char mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, 359 int newmapping); 360 int mac_check_vnode_op(struct ucred *cred, struct vnode *vp, int op); 361 int mac_check_vnode_open(struct ucred *cred, struct vnode *vp, 362 mode_t acc_mode); 363 int mac_check_vnode_readdir(struct ucred *cred, struct vnode *vp); 364 int mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp); 365 int mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 366 struct vnode *vp, struct componentname *cnp); 367 int mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 368 struct vnode *vp, int samedir, struct componentname *cnp); 369 int mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp); 370 int mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, 371 acl_type_t type, struct acl *acl); 372 int mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 373 int attrnamespace, const char *name, struct uio *uio); 374 int mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, 375 u_long flags); 376 int mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, 377 mode_t mode); 378 int mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, 379 uid_t uid, gid_t gid); 380 int mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 381 struct timespec atime, struct timespec mtime); 382 int mac_check_vnode_stat(struct ucred *cred, struct vnode *vp); 383 int mac_getsockopt_label_get(struct ucred *cred, struct socket *so, 384 struct mac *extmac); 385 int mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, 386 struct mac *extmac); 387 int mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, 388 struct ifnet *ifnet); 389 int mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, 390 struct ifnet *ifnet); 391 int mac_setsockopt_label_set(struct ucred *cred, struct socket *so, 392 struct mac *extmac); 393 int mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, 394 struct label *label); 395 396 /* 397 * Calls to help various file systems implement labeling functionality 398 * using their existing EA implementation. 399 */ 400 int vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, 401 struct ucred *cred); 402 int vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap); 403 int vop_stdsetlabel_ea(struct vop_setlabel_args *ap); 404 405 #endif /* _KERNEL */ 406 407 #endif /* !_SYS_MAC_H */ 408