1 /*- 2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 3 * Authors: Doug Rabson <dfr@rabson.org> 4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/kobj.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 #include <sys/mutex.h> 38 #include <sys/priv.h> 39 #include <sys/syscall.h> 40 #include <sys/sysent.h> 41 #include <sys/sysproto.h> 42 43 #include <kgssapi/gssapi.h> 44 #include <kgssapi/gssapi_impl.h> 45 #include <rpc/rpc.h> 46 #include <rpc/rpc_com.h> 47 #include <rpc/rpcsec_gss.h> 48 49 #include "gssd.h" 50 #include "kgss_if.h" 51 52 MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API"); 53 54 /* 55 * Syscall hooks 56 */ 57 static int gssd_syscall_offset = SYS_gssd_syscall; 58 static struct sysent gssd_syscall_prev_sysent; 59 MAKE_SYSENT(gssd_syscall); 60 static bool_t gssd_syscall_registered = FALSE; 61 62 struct kgss_mech_list kgss_mechs; 63 CLIENT *kgss_gssd_handle; 64 struct mtx kgss_gssd_lock; 65 66 static void 67 kgss_init(void *dummy) 68 { 69 int error; 70 71 LIST_INIT(&kgss_mechs); 72 error = syscall_register(&gssd_syscall_offset, &gssd_syscall_sysent, 73 &gssd_syscall_prev_sysent, SY_THR_STATIC_KLD); 74 if (error) 75 printf("Can't register GSSD syscall\n"); 76 else 77 gssd_syscall_registered = TRUE; 78 } 79 SYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL); 80 81 static void 82 kgss_uninit(void *dummy) 83 { 84 85 if (gssd_syscall_registered) 86 syscall_deregister(&gssd_syscall_offset, 87 &gssd_syscall_prev_sysent); 88 } 89 SYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL); 90 91 int 92 sys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap) 93 { 94 struct sockaddr_un sun; 95 struct netconfig *nconf; 96 char path[MAXPATHLEN]; 97 int error; 98 CLIENT *cl, *oldcl; 99 100 error = priv_check(td, PRIV_NFS_DAEMON); 101 if (error) 102 return (error); 103 104 error = copyinstr(uap->path, path, sizeof(path), NULL); 105 if (error) 106 return (error); 107 108 sun.sun_family = AF_LOCAL; 109 strcpy(sun.sun_path, path); 110 sun.sun_len = SUN_LEN(&sun); 111 112 nconf = getnetconfigent("local"); 113 cl = clnt_reconnect_create(nconf, 114 (struct sockaddr *) &sun, GSSD, GSSDVERS, 115 RPC_MAXDATASIZE, RPC_MAXDATASIZE); 116 117 mtx_lock(&kgss_gssd_lock); 118 oldcl = kgss_gssd_handle; 119 kgss_gssd_handle = cl; 120 mtx_unlock(&kgss_gssd_lock); 121 122 if (oldcl != NULL) { 123 CLNT_CLOSE(oldcl); 124 CLNT_RELEASE(oldcl); 125 } 126 127 return (0); 128 } 129 130 int 131 kgss_oid_equal(const gss_OID oid1, const gss_OID oid2) 132 { 133 134 if (oid1 == oid2) 135 return (1); 136 if (!oid1 || !oid2) 137 return (0); 138 if (oid1->length != oid2->length) 139 return (0); 140 if (memcmp(oid1->elements, oid2->elements, oid1->length)) 141 return (0); 142 return (1); 143 } 144 145 void 146 kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls) 147 { 148 struct kgss_mech *km; 149 150 km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK); 151 km->km_mech_type = mech_type; 152 km->km_mech_name = name; 153 km->km_class = cls; 154 LIST_INSERT_HEAD(&kgss_mechs, km, km_link); 155 } 156 157 void 158 kgss_uninstall_mech(gss_OID mech_type) 159 { 160 struct kgss_mech *km; 161 162 LIST_FOREACH(km, &kgss_mechs, km_link) { 163 if (kgss_oid_equal(km->km_mech_type, mech_type)) { 164 LIST_REMOVE(km, km_link); 165 free(km, M_GSSAPI); 166 return; 167 } 168 } 169 } 170 171 gss_OID 172 kgss_find_mech_by_name(const char *name) 173 { 174 struct kgss_mech *km; 175 176 LIST_FOREACH(km, &kgss_mechs, km_link) { 177 if (!strcmp(km->km_mech_name, name)) { 178 return (km->km_mech_type); 179 } 180 } 181 return (GSS_C_NO_OID); 182 } 183 184 const char * 185 kgss_find_mech_by_oid(const gss_OID oid) 186 { 187 struct kgss_mech *km; 188 189 LIST_FOREACH(km, &kgss_mechs, km_link) { 190 if (kgss_oid_equal(km->km_mech_type, oid)) { 191 return (km->km_mech_name); 192 } 193 } 194 return (NULL); 195 } 196 197 gss_ctx_id_t 198 kgss_create_context(gss_OID mech_type) 199 { 200 struct kgss_mech *km; 201 gss_ctx_id_t ctx; 202 203 LIST_FOREACH(km, &kgss_mechs, km_link) { 204 if (kgss_oid_equal(km->km_mech_type, mech_type)) 205 break; 206 } 207 if (!km) 208 return (NULL); 209 210 ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK); 211 KGSS_INIT(ctx); 212 213 return (ctx); 214 } 215 216 void 217 kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token) 218 { 219 220 KGSS_DELETE(ctx, output_token); 221 kobj_delete((kobj_t) ctx, M_GSSAPI); 222 } 223 224 OM_uint32 225 kgss_transfer_context(gss_ctx_id_t ctx) 226 { 227 struct export_sec_context_res res; 228 struct export_sec_context_args args; 229 enum clnt_stat stat; 230 OM_uint32 maj_stat; 231 232 if (!kgss_gssd_handle) 233 return (GSS_S_FAILURE); 234 235 args.ctx = ctx->handle; 236 bzero(&res, sizeof(res)); 237 stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle); 238 if (stat != RPC_SUCCESS) { 239 return (GSS_S_FAILURE); 240 } 241 242 maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token); 243 ctx->handle = 0; 244 245 xdr_free((xdrproc_t) xdr_export_sec_context_res, &res); 246 247 return (maj_stat); 248 } 249 250 void 251 kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to) 252 { 253 to->length = from->length; 254 if (from->length) { 255 to->value = malloc(from->length, M_GSSAPI, M_WAITOK); 256 bcopy(from->value, to->value, from->length); 257 } else { 258 to->value = NULL; 259 } 260 } 261 262 /* 263 * Acquire the kgss_gssd_handle and return it with a reference count, 264 * if it is available. 265 */ 266 CLIENT * 267 kgss_gssd_client(void) 268 { 269 CLIENT *cl; 270 271 mtx_lock(&kgss_gssd_lock); 272 cl = kgss_gssd_handle; 273 if (cl != NULL) 274 CLNT_ACQUIRE(cl); 275 mtx_unlock(&kgss_gssd_lock); 276 return (cl); 277 } 278 279 /* 280 * Kernel module glue 281 */ 282 static int 283 kgssapi_modevent(module_t mod, int type, void *data) 284 { 285 int error = 0; 286 287 switch (type) { 288 case MOD_LOAD: 289 rpc_gss_entries.rpc_gss_refresh_auth = rpc_gss_refresh_auth; 290 rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind; 291 rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge; 292 rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate; 293 rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults; 294 rpc_gss_entries.rpc_gss_max_data_length = 295 rpc_gss_max_data_length; 296 rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error; 297 rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid; 298 rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech; 299 rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num; 300 rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms; 301 rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions; 302 rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed; 303 rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name; 304 rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name; 305 rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred; 306 rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback; 307 rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback; 308 rpc_gss_entries.rpc_gss_get_principal_name = 309 rpc_gss_get_principal_name; 310 rpc_gss_entries.rpc_gss_svc_max_data_length = 311 rpc_gss_svc_max_data_length; 312 mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF); 313 break; 314 case MOD_UNLOAD: 315 /* 316 * Unloading of the kgssapi module is not currently supported. 317 * If somebody wants this, we would need to keep track of 318 * currently executing threads and make sure the count is 0. 319 */ 320 /* FALLTHROUGH */ 321 default: 322 error = EOPNOTSUPP; 323 }; 324 return (error); 325 } 326 static moduledata_t kgssapi_mod = { 327 "kgssapi", 328 kgssapi_modevent, 329 NULL, 330 }; 331 DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY); 332 MODULE_DEPEND(kgssapi, krpc, 1, 1, 1); 333 MODULE_VERSION(kgssapi, 1); 334