gss_impl.c revision 223309
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: head/sys/kgssapi/gss_impl.c 223309 2011-06-19 22:08:55Z rmacklem $"); 30 31#include <sys/param.h> 32#include <sys/kernel.h> 33#include <sys/kobj.h> 34#include <sys/malloc.h> 35#include <sys/module.h> 36#include <sys/priv.h> 37#include <sys/syscall.h> 38#include <sys/sysent.h> 39#include <sys/sysproto.h> 40 41#include <kgssapi/gssapi.h> 42#include <kgssapi/gssapi_impl.h> 43#include <rpc/rpc.h> 44#include <rpc/rpc_com.h> 45#include <rpc/rpcsec_gss.h> 46 47#include "gssd.h" 48#include "kgss_if.h" 49 50MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API"); 51 52/* 53 * Syscall hooks 54 */ 55static int gssd_syscall_offset = SYS_gssd_syscall; 56static struct sysent gssd_syscall_prev_sysent; 57MAKE_SYSENT(gssd_syscall); 58static bool_t gssd_syscall_registered = FALSE; 59 60struct kgss_mech_list kgss_mechs; 61CLIENT *kgss_gssd_handle; 62 63static void 64kgss_init(void *dummy) 65{ 66 int error; 67 68 LIST_INIT(&kgss_mechs); 69 error = syscall_register(&gssd_syscall_offset, &gssd_syscall_sysent, 70 &gssd_syscall_prev_sysent); 71 if (error) 72 printf("Can't register GSSD syscall\n"); 73 else 74 gssd_syscall_registered = TRUE; 75} 76SYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL); 77 78static void 79kgss_uninit(void *dummy) 80{ 81 82 if (gssd_syscall_registered) 83 syscall_deregister(&gssd_syscall_offset, 84 &gssd_syscall_prev_sysent); 85} 86SYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL); 87 88int 89gssd_syscall(struct thread *td, struct gssd_syscall_args *uap) 90{ 91 struct sockaddr_un sun; 92 struct netconfig *nconf; 93 char path[MAXPATHLEN]; 94 int error; 95 96 error = priv_check(td, PRIV_NFS_DAEMON); 97 if (error) 98 return (error); 99 100 if (kgss_gssd_handle) 101 CLNT_DESTROY(kgss_gssd_handle); 102 103 error = copyinstr(uap->path, path, sizeof(path), NULL); 104 if (error) 105 return (error); 106 107 sun.sun_family = AF_LOCAL; 108 strcpy(sun.sun_path, path); 109 sun.sun_len = SUN_LEN(&sun); 110 111 nconf = getnetconfigent("local"); 112 kgss_gssd_handle = clnt_reconnect_create(nconf, 113 (struct sockaddr *) &sun, GSSD, GSSDVERS, 114 RPC_MAXDATASIZE, RPC_MAXDATASIZE); 115 116 return (0); 117} 118 119int 120kgss_oid_equal(const gss_OID oid1, const gss_OID oid2) 121{ 122 123 if (oid1 == oid2) 124 return (1); 125 if (!oid1 || !oid2) 126 return (0); 127 if (oid1->length != oid2->length) 128 return (0); 129 if (memcmp(oid1->elements, oid2->elements, oid1->length)) 130 return (0); 131 return (1); 132} 133 134void 135kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls) 136{ 137 struct kgss_mech *km; 138 139 km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK); 140 km->km_mech_type = mech_type; 141 km->km_mech_name = name; 142 km->km_class = cls; 143 LIST_INSERT_HEAD(&kgss_mechs, km, km_link); 144} 145 146void 147kgss_uninstall_mech(gss_OID mech_type) 148{ 149 struct kgss_mech *km; 150 151 LIST_FOREACH(km, &kgss_mechs, km_link) { 152 if (kgss_oid_equal(km->km_mech_type, mech_type)) { 153 LIST_REMOVE(km, km_link); 154 free(km, M_GSSAPI); 155 return; 156 } 157 } 158} 159 160gss_OID 161kgss_find_mech_by_name(const char *name) 162{ 163 struct kgss_mech *km; 164 165 LIST_FOREACH(km, &kgss_mechs, km_link) { 166 if (!strcmp(km->km_mech_name, name)) { 167 return (km->km_mech_type); 168 } 169 } 170 return (GSS_C_NO_OID); 171} 172 173const char * 174kgss_find_mech_by_oid(const gss_OID oid) 175{ 176 struct kgss_mech *km; 177 178 LIST_FOREACH(km, &kgss_mechs, km_link) { 179 if (kgss_oid_equal(km->km_mech_type, oid)) { 180 return (km->km_mech_name); 181 } 182 } 183 return (NULL); 184} 185 186gss_ctx_id_t 187kgss_create_context(gss_OID mech_type) 188{ 189 struct kgss_mech *km; 190 gss_ctx_id_t ctx; 191 192 LIST_FOREACH(km, &kgss_mechs, km_link) { 193 if (kgss_oid_equal(km->km_mech_type, mech_type)) 194 break; 195 } 196 if (!km) 197 return (NULL); 198 199 ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK); 200 KGSS_INIT(ctx); 201 202 return (ctx); 203} 204 205void 206kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token) 207{ 208 209 KGSS_DELETE(ctx, output_token); 210 kobj_delete((kobj_t) ctx, M_GSSAPI); 211} 212 213OM_uint32 214kgss_transfer_context(gss_ctx_id_t ctx) 215{ 216 struct export_sec_context_res res; 217 struct export_sec_context_args args; 218 enum clnt_stat stat; 219 OM_uint32 maj_stat; 220 221 if (!kgss_gssd_handle) 222 return (GSS_S_FAILURE); 223 224 args.ctx = ctx->handle; 225 bzero(&res, sizeof(res)); 226 stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle); 227 if (stat != RPC_SUCCESS) { 228 return (GSS_S_FAILURE); 229 } 230 231 maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token); 232 ctx->handle = 0; 233 234 xdr_free((xdrproc_t) xdr_export_sec_context_res, &res); 235 236 return (maj_stat); 237} 238 239void 240kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to) 241{ 242 to->length = from->length; 243 if (from->length) { 244 to->value = malloc(from->length, M_GSSAPI, M_WAITOK); 245 bcopy(from->value, to->value, from->length); 246 } else { 247 to->value = NULL; 248 } 249} 250 251/* 252 * Kernel module glue 253 */ 254static int 255kgssapi_modevent(module_t mod, int type, void *data) 256{ 257 int error = 0; 258 259 switch (type) { 260 case MOD_LOAD: 261 rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind; 262 rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge; 263 rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate; 264 rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults; 265 rpc_gss_entries.rpc_gss_max_data_length = 266 rpc_gss_max_data_length; 267 rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error; 268 rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid; 269 rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech; 270 rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num; 271 rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms; 272 rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions; 273 rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed; 274 rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name; 275 rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name; 276 rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred; 277 rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback; 278 rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback; 279 rpc_gss_entries.rpc_gss_get_principal_name = 280 rpc_gss_get_principal_name; 281 rpc_gss_entries.rpc_gss_svc_max_data_length = 282 rpc_gss_svc_max_data_length; 283 break; 284 case MOD_UNLOAD: 285 /* Unloading of the kgssapi module isn't supported. */ 286 /* FALLTHROUGH */ 287 default: 288 error = EOPNOTSUPP; 289 }; 290 return (error); 291} 292static moduledata_t kgssapi_mod = { 293 "kgssapi", 294 kgssapi_modevent, 295 NULL, 296}; 297DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY); 298MODULE_DEPEND(kgssapi, krpc, 1, 1, 1); 299MODULE_VERSION(kgssapi, 1); 300