1 /* $NetBSD: secmodel_example.c,v 1.16 2007/11/23 16:37:47 uebayasi Exp $ */ 2 3 /* 4 * This file is placed in the public domain. 5 */ 6 7 /* 8 * Skeleton file for building a NetBSD security model from scratch, containing 9 * every kauth(9) scope, action, and request, as well as some coding hints. 10 * 11 * This file will be kept in-sync with the official NetBSD kernel, so *always* 12 * use the latest revision. 13 */ 14 15 #include <sys/cdefs.h> 16 __KERNEL_RCSID(0, "$NetBSD: secmodel_example.c,v 1.16 2007/11/23 16:37:47 uebayasi Exp $"); 17 18 #include <sys/types.h> 19 #include <sys/param.h> 20 #include <sys/kauth.h> 21 22 #include <sys/sysctl.h> 23 24 #include <secmodel/secmodel.h> 25 26 #include <secmodel/example/example.h> 27 28 /* 29 * Initialize the security model. 30 */ 31 void 32 secmodel_example_init(void) 33 { 34 return; 35 } 36 37 /* 38 * If the security model is to be used as an LKM, this routine should be 39 * changed, because otherwise creating permanent sysctl(9) nodes will fail. 40 * 41 * To make it work, the prototype should be changed to something like: 42 * 43 * void secmodel_example_sysctl(void) 44 * 45 * and it should be called from secmodel_start(). 46 * 47 * In addition, the CTLFLAG_PERMANENT flag must be removed from all the 48 * nodes. 49 */ 50 SYSCTL_SETUP(sysctl_security_example_setup, 51 "sysctl security example setup") 52 { 53 const struct sysctlnode *rnode; 54 55 sysctl_createv(clog, 0, NULL, &rnode, 56 CTLFLAG_PERMANENT, 57 CTLTYPE_NODE, "security", NULL, 58 NULL, 0, NULL, 0, 59 CTL_CREATE, CTL_EOL); 60 61 sysctl_createv(clog, 0, &rnode, &rnode, 62 CTLFLAG_PERMANENT, 63 CTLTYPE_NODE, "models", NULL, 64 NULL, 0, NULL, 0, 65 CTL_CREATE, CTL_EOL); 66 67 sysctl_createv(clog, 0, &rnode, &rnode, 68 CTLFLAG_PERMANENT, 69 CTLTYPE_NODE, "example", 70 SYSCTL_DESCR("example security model"), 71 NULL, 0, NULL, 0, 72 CTL_CREATE, CTL_EOL); 73 74 sysctl_createv(clog, 0, &rnode, NULL, 75 CTLFLAG_PERMANENT, 76 CTLTYPE_STRING, "name", NULL, 77 NULL, 0, __UNCONST("Example"), 0 78 CTL_CREATE, CTL_EOL); 79 80 } 81 82 /* 83 * Start the security model. 84 */ 85 void 86 secmodel_start(void) 87 { 88 secmodel_example_init(); 89 90 kauth_listen_scope(KAUTH_SCOPE_GENERIC, 91 secmodel_example_generic_cb, NULL); 92 kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 93 secmodel_example_system_cb, NULL); 94 kauth_listen_scope(KAUTH_SCOPE_PROCESS, 95 secmodel_example_process_cb, NULL); 96 kauth_listen_scope(KAUTH_SCOPE_NETWORK, 97 secmodel_example_network_cb, NULL); 98 kauth_listen_scope(KAUTH_SCOPE_MACHDEP, 99 secmodel_example_machdep_cb, NULL); 100 } 101 102 /* 103 * Security model: example 104 * Scope: Generic 105 */ 106 int 107 secmodel_example_generic_cb(kauth_cred_t, kauth_action_t action, 108 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 109 { 110 int result; 111 112 result = KAUTH_RESULT_DENY; 113 114 switch(action) { 115 case KAUTH_GENERIC_ISSUSER: 116 case KAUTH_GENERIC_CANSEE: 117 default: 118 result = KAUTH_RESULT_DEFER; 119 break; 120 } 121 122 return (result); 123 } 124 125 /* 126 * Security model: example 127 * Scope: System 128 */ 129 int 130 secmodel_example_system_cb(kauth_cred_t cred, kauth_action_t action, 131 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 132 { 133 int result; 134 enum kauth_system_req req; 135 136 result = KAUTH_RESULT_DENY; 137 138 req = (enum kauth_system_req)arg0; 139 140 switch (action) { 141 case KAUTH_SYSTEM_MOUNT: 142 switch (req) { 143 case KAUTH_REQ_SYSTEM_MOUNT_GET: 144 case KAUTH_REQ_SYSTEM_MOUNT_NEW: 145 case KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT: 146 case KAUTH_REQ_SYSTEM_MOUNT_UPDATE: 147 default: 148 result = KAUTH_RESULT_DEFER; 149 break; 150 } 151 break; 152 153 case KAUTH_SYSTEM_TIME: 154 switch (req) { 155 case KAUTH_REQ_SYSTEM_TIME_ADJTIME: 156 case KAUTH_REQ_SYSTEM_TIME_BACKWARDS: 157 case KAUTH_REQ_SYSTEM_TIME_NTPADJTIME: 158 case KAUTH_REQ_SYSTEM_TIME_RTCOFFSET: 159 case KAUTH_REQ_SYSTEM_TIME_SYSTEM: 160 case KAUTH_REQ_SYSTEM_TIME_TIMECOUNTERS: 161 default: 162 result = KAUTH_RESULT_DEFER; 163 break; 164 } 165 break; 166 167 case KAUTH_SYSTEM_SYSCTL: 168 switch (req) { 169 case KAUTH_REQ_SYSTEM_SYSCTL_ADD: 170 case KAUTH_REQ_SYSTEM_SYSCTL_DELETE: 171 case KAUTH_REQ_SYSTEM_SYSCTL_DESC: 172 default: 173 result = KAUTH_RESULT_DEFER; 174 break; 175 } 176 break; 177 178 case KAUTH_SYSTEM_CHROOT: 179 switch (req) { 180 case KAUTH_REQ_SYSTEM_CHROOT_CHROOT: 181 case KAUTH_REQ_SYSTEM_CHROOT_FCHROOT: 182 default: 183 result = KAUTH_RESULT_DEFER; 184 break; 185 } 186 break; 187 188 case KAUTH_SYSTEM_DEBUG: 189 switch (req) { 190 case KAUTH_REQ_SYSTEM_DEBUG_IPKDB: 191 default: 192 result = KAUTH_RESULT_DEFER; 193 break; 194 } 195 break; 196 197 case KAUTH_SYSTEM_LKM: 198 case KAUTH_SYSTEM_FILEHANDLE: 199 case KAUTH_SYSTEM_MKNOD: 200 case KAUTH_SYSTEM_SETIDCORE: 201 case KAUTH_SYSTEM_SWAPCTL: 202 case KAUTH_SYSTEM_ACCOUNTING: 203 case KAUTH_SYSTEM_REBOOT: 204 default: 205 result = KAUTH_RESULT_DEFER; 206 break; 207 } 208 209 return (result); 210 } 211 212 /* 213 * kauth(9) listener 214 * 215 * Security model: example 216 * Scope: Process 217 */ 218 int 219 secmodel_example_process_cb(kauth_cred_t cred, kauth_action_t action, 220 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 221 { 222 int result; 223 224 result = KAUTH_RESULT_DENY; 225 226 switch (action) { 227 case KAUTH_PROCESS_CANPROCFS: 228 case KAUTH_PROCESS_CANSEE: 229 case KAUTH_PROCESS_CANSIGNAL: 230 case KAUTH_PROCESS_CANSYSTRACE: 231 case KAUTH_PROCESS_CANPTRACE: 232 case KAUTH_PROCESS_CORENAME: 233 case KAUTH_PROCESS_NICE: 234 case KAUTH_PROCESS_RLIMIT: 235 case KAUTH_PROCESS_SETID: 236 case KAUTH_PROCESS_STOPFLAG: 237 default: 238 result = KAUTH_RESULT_DEFER; 239 break; 240 } 241 242 return (result); 243 } 244 245 /* 246 * kauth(9) listener 247 * 248 * Security model: example 249 * Scope: Network 250 */ 251 int 252 secmodel_example_network_cb(kauth_cred_t cred, kauth_action_t action, 253 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 254 { 255 int result; 256 257 result = KAUTH_RESULT_DENY; 258 259 switch (action) { 260 case KAUTH_NETWORK_ALTQ: 261 switch((u_long)arg0) { 262 case KAUTH_REQ_NETWORK_ALTQ_AFMAP: 263 case KAUTH_REQ_NETWORK_ALTQ_BLUE: 264 case KAUTH_REQ_NETWORK_ALTQ_CBQ: 265 case KAUTH_REQ_NETWORK_ALTQ_CDNR: 266 case KAUTH_REQ_NETWORK_ALTQ_CONF: 267 case KAUTH_REQ_NETWORK_ALTQ_FIFOQ: 268 case KAUTH_REQ_NETWORK_ALTQ_HFSC: 269 case KAUTH_REQ_NETWORK_ALTQ_JOBS: 270 case KAUTH_REQ_NETWORK_ALTQ_PRIQ: 271 case KAUTH_REQ_NETWORK_ALTQ_RED: 272 case KAUTH_REQ_NETWORK_ALTQ_RIO: 273 case KAUTH_REQ_NETWORK_ALTQ_WFQ: 274 default: 275 result = KAUTH_RESULT_DEFER; 276 break; 277 } 278 break; 279 280 case KAUTH_NETWORK_BIND: 281 switch((u_long)arg0) { 282 case KAUTH_REQ_NETWORK_BIND_PORT: 283 case KAUTH_REQ_NETWORK_BIND_PRIVPORT: 284 default: 285 result = KAUTH_RESULT_DEFER; 286 break; 287 } 288 break; 289 290 case KAUTH_NETWORK_FIREWALL: 291 switch ((u_long)arg0) { 292 case KAUTH_REQ_NETWORK_FIREWALL_FW: 293 case KAUTH_REQ_NETWORK_FIREWALL_NAT: 294 default: 295 result = KAUTH_RESULT_DEFER; 296 break; 297 } 298 break; 299 300 case KAUTH_NETWORK_FORWSRCRT: 301 break; 302 303 case KAUTH_NETWORK_INTERFACE: 304 switch ((u_long)arg0) { 305 case KAUTH_REQ_NETWORK_INTERFACE_GET: 306 case KAUTH_REQ_NETWORK_INTERFACE_SET: 307 case KAUTH_REQ_NETWORK_INTERFACE_GETPRIV: 308 case KAUTH_REQ_NETWORK_INTERFACE_SETPRIV: 309 default: 310 result = KAUTH_RESULT_DEFER; 311 break; 312 } 313 break; 314 315 case KAUTH_NETWORK_ROUTE: 316 break; 317 318 case KAUTH_NETWORK_SOCKET: 319 switch((u_long)arg0) { 320 case KAUTH_REQ_NETWORK_SOCKET_OPEN: 321 case KAUTH_REQ_NETWORK_SOCKET_RAWSOCK: 322 case KAUTH_REQ_NETWORK_SOCKET_CANSEE: 323 default: 324 result = KAUTH_RESULT_DEFER; 325 break; 326 } 327 break; 328 329 default: 330 result = KAUTH_RESULT_DEFER; 331 break; 332 } 333 334 return (result); 335 } 336 337 /* 338 * kauth(9) listener 339 * 340 * Security model: example 341 * Scope: Machdep 342 */ 343 int 344 secmodel_example_machdep_cb(kauth_cred_t cred, kauth_action_t action, 345 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 346 { 347 int result; 348 349 result = KAUTH_RESULT_DENY; 350 351 switch (action) { 352 case KAUTH_MACHDEP_IOPERM_GET: 353 case KAUTH_MACHDEP_IOPERM_SET: 354 case KAUTH_MACHDEP_IOPL: 355 case KAUTH_MACHDEP_LDT_GET: 356 case KAUTH_MACHDEP_LDT_SET: 357 case KAUTH_MACHDEP_MTRR_GET: 358 case KAUTH_MACHDEP_MTRR_SET: 359 case KAUTH_MACHDEP_UNMANAGEDMEM: 360 default: 361 result = KAUTH_RESULT_DEFER; 362 break; 363 } 364 365 return (result); 366 } 367 368 /* 369 * kauth(9) listener 370 * 371 * Security model: example 372 * Scope: Device 373 */ 374 int 375 secmodel_example_device_cb(kauth_cred_t cred, kauth_action_t action, 376 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 377 { 378 int result; 379 380 result = KAUTH_RESULT_DENY; 381 382 switch (action) { 383 case KAUTH_DEVICE_TTY_OPEN: 384 case KAUTH_DEVICE_TTY_PRIVSET: 385 break; 386 387 case KAUTH_DEVICE_RAWIO_SPEC: 388 switch ((u_long)arg0) { 389 case KAUTH_REQ_DEVICE_RAWIO_SPEC_READ: 390 case KAUTH_REQ_DEVICE_RAWIO_SPEC_WRITE: 391 case KAUTH_REQ_DEVICE_RAWIO_SPEC_RW: 392 break; 393 394 default: 395 result = KAUTH_RESULT_DEFER; 396 break; 397 } 398 399 break; 400 401 case KAUTH_DEVICE_RAWIO_PASSTHRU: 402 default: 403 result = KAUTH_RESULT_DEFER; 404 break; 405 } 406 407 return (result); 408 } 409