secmodel_overlay.c revision 1.2
1 /* $NetBSD: secmodel_overlay.c,v 1.2 2006/09/08 21:57:38 elad Exp $ */ 2 /*- 3 * Copyright (c) 2006 Elad Efrat <elad (at) NetBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Elad Efrat. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: secmodel_overlay.c,v 1.2 2006/09/08 21:57:38 elad Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/kauth.h> 38 39 #include <sys/sysctl.h> 40 41 #include <secmodel/secmodel.h> 42 #include <secmodel/overlay/overlay.h> 43 44 #include <secmodel/bsd44/bsd44.h> 45 #include <secmodel/bsd44/suser.h> 46 #include <secmodel/bsd44/securelevel.h> 47 48 /* 49 * Fall-back settings. 50 */ 51 #define OVERLAY_ISCOPE_GENERIC "org.netbsd.kauth.overlay.generic" 52 #define OVERLAY_ISCOPE_SYSTEM "org.netbsd.kauth.overlay.system" 53 #define OVERLAY_ISCOPE_PROCESS "org.netbsd.kauth.overlay.process" 54 #define OVERLAY_ISCOPE_NETWORK "org.netbsd.kauth.overlay.network" 55 #define OVERLAY_ISCOPE_MACHDEP "org.netbsd.kauth.overlay.machdep" 56 57 static kauth_scope_t secmodel_overlay_iscope_generic; 58 static kauth_scope_t secmodel_overlay_iscope_system; 59 static kauth_scope_t secmodel_overlay_iscope_process; 60 static kauth_scope_t secmodel_overlay_iscope_network; 61 static kauth_scope_t secmodel_overlay_iscope_machdep; 62 63 extern int secmodel_bsd44_curtain; 64 65 /* 66 * Initialize the overlay security model. 67 */ 68 void 69 secmodel_overlay_init(void) 70 { 71 /* 72 * Register internal fall-back scopes. 73 */ 74 secmodel_overlay_iscope_generic = kauth_register_scope( 75 OVERLAY_ISCOPE_GENERIC, NULL, NULL); 76 secmodel_overlay_iscope_system = kauth_register_scope( 77 OVERLAY_ISCOPE_SYSTEM, NULL, NULL); 78 secmodel_overlay_iscope_process = kauth_register_scope( 79 OVERLAY_ISCOPE_PROCESS, NULL, NULL); 80 secmodel_overlay_iscope_network = kauth_register_scope( 81 OVERLAY_ISCOPE_NETWORK, NULL, NULL); 82 secmodel_overlay_iscope_machdep = kauth_register_scope( 83 OVERLAY_ISCOPE_MACHDEP, NULL, NULL); 84 85 /* 86 * Register fall-back listeners, from bsd44, to each internal 87 * fall-back scope. 88 */ 89 kauth_listen_scope(OVERLAY_ISCOPE_GENERIC, 90 secmodel_bsd44_suser_generic_cb, NULL); 91 92 kauth_listen_scope(OVERLAY_ISCOPE_SYSTEM, 93 secmodel_bsd44_suser_system_cb, NULL); 94 kauth_listen_scope(OVERLAY_ISCOPE_SYSTEM, 95 secmodel_bsd44_securelevel_system_cb, NULL); 96 97 kauth_listen_scope(OVERLAY_ISCOPE_PROCESS, 98 secmodel_bsd44_suser_process_cb, NULL); 99 kauth_listen_scope(OVERLAY_ISCOPE_PROCESS, 100 secmodel_bsd44_securelevel_process_cb, NULL); 101 102 kauth_listen_scope(OVERLAY_ISCOPE_NETWORK, 103 secmodel_bsd44_suser_network_cb, NULL); 104 kauth_listen_scope(OVERLAY_ISCOPE_NETWORK, 105 secmodel_bsd44_securelevel_network_cb, NULL); 106 107 kauth_listen_scope(OVERLAY_ISCOPE_MACHDEP, 108 secmodel_bsd44_suser_machdep_cb, NULL); 109 kauth_listen_scope(OVERLAY_ISCOPE_MACHDEP, 110 secmodel_bsd44_securelevel_machdep_cb, NULL); 111 112 secmodel_bsd44_init(); 113 } 114 115 SYSCTL_SETUP(sysctl_security_overlay_setup, 116 "sysctl security overlay setup") 117 { 118 const struct sysctlnode *rnode; 119 120 sysctl_createv(clog, 0, NULL, &rnode, 121 CTLFLAG_PERMANENT, 122 CTLTYPE_NODE, "security", NULL, 123 NULL, 0, NULL, 0, 124 CTL_CREATE, CTL_EOL); 125 126 sysctl_createv(clog, 0, &rnode, &rnode, 127 CTLFLAG_PERMANENT, 128 CTLTYPE_NODE, "models", NULL, 129 NULL, 0, NULL, 0, 130 CTL_CREATE, CTL_EOL); 131 132 sysctl_createv(clog, 0, &rnode, &rnode, 133 CTLFLAG_PERMANENT, 134 CTLTYPE_NODE, "overlay", 135 SYSCTL_DESCR("Overlay security model on-top of bsd44, "), 136 NULL, 0, NULL, 0, 137 CTL_CREATE, CTL_EOL); 138 139 sysctl_createv(clog, 0, &rnode, NULL, 140 CTLFLAG_PERMANENT, 141 CTLTYPE_STRING, "name", NULL, 142 NULL, 0, __UNCONST("Overlay (on-top of bsd44)"), 0, 143 CTL_CREATE, CTL_EOL); 144 145 sysctl_createv(clog, 0, &rnode, NULL, 146 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 147 CTLTYPE_INT, "securelevel", 148 SYSCTL_DESCR("System security level"), 149 secmodel_bsd44_sysctl_securelevel, 0, &securelevel, 0, 150 CTL_CREATE, CTL_EOL); 151 152 sysctl_createv(clog, 0, &rnode, NULL, 153 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 154 CTLTYPE_INT, "curtain", 155 SYSCTL_DESCR("Curtain information about objects to " 156 "users not owning them."), 157 NULL, 0, &secmodel_bsd44_curtain, 0, 158 CTL_CREATE, CTL_EOL); 159 } 160 161 /* 162 * Start the overlay security model. 163 */ 164 void 165 secmodel_start(void) 166 { 167 secmodel_overlay_init(); 168 169 kauth_listen_scope(KAUTH_SCOPE_GENERIC, 170 secmodel_overlay_generic_cb, NULL); 171 kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 172 secmodel_overlay_system_cb, NULL); 173 kauth_listen_scope(KAUTH_SCOPE_PROCESS, 174 secmodel_overlay_process_cb, NULL); 175 kauth_listen_scope(KAUTH_SCOPE_NETWORK, 176 secmodel_overlay_network_cb, NULL); 177 kauth_listen_scope(KAUTH_SCOPE_MACHDEP, 178 secmodel_overlay_machdep_cb, NULL); 179 } 180 181 /* 182 * Overlay listener for the generic scope. 183 */ 184 int 185 secmodel_overlay_generic_cb(kauth_cred_t cred, kauth_action_t action, 186 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 187 { 188 int result; 189 190 result = KAUTH_RESULT_DEFER; 191 192 switch (action) { 193 default: 194 result = KAUTH_RESULT_DEFER; 195 break; 196 } 197 198 if (result == KAUTH_RESULT_DEFER) { 199 result = kauth_authorize_action( 200 secmodel_overlay_iscope_generic, cred, action, 201 arg0, arg1, arg2, arg3); 202 } 203 204 return (result); 205 } 206 207 /* 208 * Overlay listener for the system scope. 209 */ 210 int 211 secmodel_overlay_system_cb(kauth_cred_t cred, kauth_action_t action, 212 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 213 { 214 int result; 215 216 result = KAUTH_RESULT_DEFER; 217 218 switch (action) { 219 default: 220 result = KAUTH_RESULT_DEFER; 221 break; 222 } 223 224 if (result == KAUTH_RESULT_DEFER) { 225 result = kauth_authorize_action( 226 secmodel_overlay_iscope_system, cred, action, 227 arg0, arg1, arg2, arg3); 228 } 229 230 return (result); 231 } 232 233 /* 234 * Overlay listener for the process scope. 235 */ 236 int 237 secmodel_overlay_process_cb(kauth_cred_t cred, kauth_action_t action, 238 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 239 { 240 int result; 241 242 result = KAUTH_RESULT_DEFER; 243 244 switch (action) { 245 default: 246 result = KAUTH_RESULT_DEFER; 247 break; 248 } 249 250 if (result == KAUTH_RESULT_DEFER) { 251 result = kauth_authorize_action( 252 secmodel_overlay_iscope_process, cred, action, 253 arg0, arg1, arg2, arg3); 254 } 255 256 return (result); 257 } 258 259 /* 260 * Overlay listener for the network scope. 261 */ 262 int 263 secmodel_overlay_network_cb(kauth_cred_t cred, kauth_action_t action, 264 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 265 { 266 int result; 267 268 result = KAUTH_RESULT_DEFER; 269 270 switch (action) { 271 default: 272 result = KAUTH_RESULT_DEFER; 273 break; 274 } 275 276 if (result == KAUTH_RESULT_DEFER) { 277 result = kauth_authorize_action( 278 secmodel_overlay_iscope_network, cred, action, 279 arg0, arg1, arg2, arg3); 280 } 281 282 return (result); 283 } 284 285 /* 286 * Overlay listener for the machdep scope. 287 */ 288 int 289 secmodel_overlay_machdep_cb(kauth_cred_t cred, kauth_action_t action, 290 void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) 291 { 292 int result; 293 294 result = KAUTH_RESULT_DEFER; 295 296 switch (action) { 297 default: 298 result = KAUTH_RESULT_DEFER; 299 break; 300 } 301 302 if (result == KAUTH_RESULT_DEFER) { 303 result = kauth_authorize_action( 304 secmodel_overlay_iscope_machdep, cred, action, 305 arg0, arg1, arg2, arg3); 306 } 307 308 return (result); 309 } 310
Indexes created Fri Sep 26 08:10:20 GMT 2025