gss_impl.c revision 253049
1198090Srdivacky/*- 2198090Srdivacky * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 3198090Srdivacky * Authors: Doug Rabson <dfr@rabson.org> 4198090Srdivacky * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> 5198090Srdivacky * 6198090Srdivacky * Redistribution and use in source and binary forms, with or without 7198090Srdivacky * modification, are permitted provided that the following conditions 8198090Srdivacky * are met: 9198090Srdivacky * 1. Redistributions of source code must retain the above copyright 10198090Srdivacky * notice, this list of conditions and the following disclaimer. 11198090Srdivacky * 2. Redistributions in binary form must reproduce the above copyright 12198090Srdivacky * notice, this list of conditions and the following disclaimer in the 13198090Srdivacky * documentation and/or other materials provided with the distribution. 14198090Srdivacky * 15198090Srdivacky * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16198090Srdivacky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17198090Srdivacky * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18198090Srdivacky * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19198090Srdivacky * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20198090Srdivacky * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21198090Srdivacky * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22198090Srdivacky * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23198090Srdivacky * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24198090Srdivacky * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25198090Srdivacky * SUCH DAMAGE. 26198090Srdivacky */ 27198090Srdivacky 28198090Srdivacky#include <sys/cdefs.h> 29198090Srdivacky__FBSDID("$FreeBSD: head/sys/kgssapi/gss_impl.c 253049 2013-07-09 01:05:28Z rmacklem $"); 30198090Srdivacky 31198090Srdivacky#include <sys/param.h> 32198090Srdivacky#include <sys/kernel.h> 33198090Srdivacky#include <sys/kobj.h> 34198090Srdivacky#include <sys/lock.h> 35198090Srdivacky#include <sys/malloc.h> 36198090Srdivacky#include <sys/module.h> 37198090Srdivacky#include <sys/mutex.h> 38198090Srdivacky#include <sys/priv.h> 39198090Srdivacky#include <sys/syscall.h> 40198090Srdivacky#include <sys/sysent.h> 41198090Srdivacky#include <sys/sysproto.h> 42198090Srdivacky 43198090Srdivacky#include <kgssapi/gssapi.h> 44198090Srdivacky#include <kgssapi/gssapi_impl.h> 45198090Srdivacky#include <rpc/rpc.h> 46198090Srdivacky#include <rpc/rpc_com.h> 47198090Srdivacky#include <rpc/rpcsec_gss.h> 48198090Srdivacky 49198090Srdivacky#include "gssd.h" 50198090Srdivacky#include "kgss_if.h" 51198090Srdivacky 52198090SrdivackyMALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API"); 53198090Srdivacky 54198090Srdivacky/* 55198090Srdivacky * Syscall hooks 56198090Srdivacky */ 57198090Srdivackystatic int gssd_syscall_offset = SYS_gssd_syscall; 58198090Srdivackystatic struct sysent gssd_syscall_prev_sysent; 59198090SrdivackyMAKE_SYSENT(gssd_syscall); 60198090Srdivackystatic bool_t gssd_syscall_registered = FALSE; 61198090Srdivacky 62198090Srdivackystruct kgss_mech_list kgss_mechs; 63198090SrdivackyCLIENT *kgss_gssd_handle; 64198090Srdivackystruct mtx kgss_gssd_lock; 65198090Srdivacky 66198090Srdivackystatic void 67198090Srdivackykgss_init(void *dummy) 68198090Srdivacky{ 69198090Srdivacky int error; 70198090Srdivacky 71198090Srdivacky LIST_INIT(&kgss_mechs); 72198090Srdivacky error = syscall_register(&gssd_syscall_offset, &gssd_syscall_sysent, 73198090Srdivacky &gssd_syscall_prev_sysent); 74198090Srdivacky if (error) 75198090Srdivacky printf("Can't register GSSD syscall\n"); 76198090Srdivacky else 77198090Srdivacky gssd_syscall_registered = TRUE; 78198090Srdivacky} 79198090SrdivackySYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL); 80198090Srdivacky 81198090Srdivackystatic void 82198090Srdivackykgss_uninit(void *dummy) 83198090Srdivacky{ 84198090Srdivacky 85198090Srdivacky if (gssd_syscall_registered) 86198090Srdivacky syscall_deregister(&gssd_syscall_offset, 87198090Srdivacky &gssd_syscall_prev_sysent); 88198090Srdivacky} 89198090SrdivackySYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL); 90198090Srdivacky 91198090Srdivackyint 92198090Srdivackysys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap) 93198090Srdivacky{ 94198090Srdivacky struct sockaddr_un sun; 95198090Srdivacky struct netconfig *nconf; 96198090Srdivacky char path[MAXPATHLEN]; 97198090Srdivacky int error; 98198090Srdivacky CLIENT *cl, *oldcl; 99198090Srdivacky 100198090Srdivacky error = priv_check(td, PRIV_NFS_DAEMON); 101198090Srdivacky if (error) 102198090Srdivacky return (error); 103198090Srdivacky 104198090Srdivacky error = copyinstr(uap->path, path, sizeof(path), NULL); 105198090Srdivacky if (error) 106198090Srdivacky return (error); 107198090Srdivacky 108198090Srdivacky sun.sun_family = AF_LOCAL; 109198090Srdivacky strcpy(sun.sun_path, path); 110198090Srdivacky sun.sun_len = SUN_LEN(&sun); 111198090Srdivacky 112198090Srdivacky nconf = getnetconfigent("local"); 113198090Srdivacky cl = clnt_reconnect_create(nconf, 114198090Srdivacky (struct sockaddr *) &sun, GSSD, GSSDVERS, 115198090Srdivacky RPC_MAXDATASIZE, RPC_MAXDATASIZE); 116198090Srdivacky 117198090Srdivacky mtx_lock(&kgss_gssd_lock); 118198090Srdivacky oldcl = kgss_gssd_handle; 119198090Srdivacky kgss_gssd_handle = cl; 120198090Srdivacky mtx_unlock(&kgss_gssd_lock); 121198090Srdivacky 122198090Srdivacky if (oldcl != NULL) { 123198090Srdivacky CLNT_CLOSE(oldcl); 124198090Srdivacky CLNT_RELEASE(oldcl); 125198090Srdivacky } 126198090Srdivacky 127198090Srdivacky return (0); 128198090Srdivacky} 129198090Srdivacky 130198090Srdivackyint 131198090Srdivackykgss_oid_equal(const gss_OID oid1, const gss_OID oid2) 132198090Srdivacky{ 133198090Srdivacky 134198090Srdivacky if (oid1 == oid2) 135198090Srdivacky return (1); 136198090Srdivacky if (!oid1 || !oid2) 137198090Srdivacky return (0); 138198090Srdivacky if (oid1->length != oid2->length) 139198090Srdivacky return (0); 140198090Srdivacky if (memcmp(oid1->elements, oid2->elements, oid1->length)) 141198090Srdivacky return (0); 142198090Srdivacky return (1); 143198090Srdivacky} 144198396Srdivacky 145198090Srdivackyvoid 146198090Srdivackykgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls) 147198396Srdivacky{ 148198090Srdivacky struct kgss_mech *km; 149198090Srdivacky 150198090Srdivacky km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK); 151198090Srdivacky km->km_mech_type = mech_type; 152198090Srdivacky km->km_mech_name = name; 153198090Srdivacky km->km_class = cls; 154198090Srdivacky LIST_INSERT_HEAD(&kgss_mechs, km, km_link); 155198090Srdivacky} 156198090Srdivacky 157198090Srdivackyvoid 158198090Srdivackykgss_uninstall_mech(gss_OID mech_type) 159198090Srdivacky{ 160198090Srdivacky struct kgss_mech *km; 161198090Srdivacky 162198090Srdivacky LIST_FOREACH(km, &kgss_mechs, km_link) { 163198090Srdivacky if (kgss_oid_equal(km->km_mech_type, mech_type)) { 164198090Srdivacky LIST_REMOVE(km, km_link); 165198090Srdivacky free(km, M_GSSAPI); 166198090Srdivacky return; 167198090Srdivacky } 168198090Srdivacky } 169198090Srdivacky} 170198090Srdivacky 171198090Srdivackygss_OID 172198090Srdivackykgss_find_mech_by_name(const char *name) 173198090Srdivacky{ 174198090Srdivacky struct kgss_mech *km; 175198090Srdivacky 176198396Srdivacky LIST_FOREACH(km, &kgss_mechs, km_link) { 177198090Srdivacky if (!strcmp(km->km_mech_name, name)) { 178198090Srdivacky return (km->km_mech_type); 179198090Srdivacky } 180198090Srdivacky } 181198090Srdivacky return (GSS_C_NO_OID); 182198090Srdivacky} 183198090Srdivacky 184198396Srdivackyconst char * 185198396Srdivackykgss_find_mech_by_oid(const gss_OID oid) 186198396Srdivacky{ 187198396Srdivacky struct kgss_mech *km; 188198396Srdivacky 189198396Srdivacky LIST_FOREACH(km, &kgss_mechs, km_link) { 190198090Srdivacky if (kgss_oid_equal(km->km_mech_type, oid)) { 191198090Srdivacky return (km->km_mech_name); 192198090Srdivacky } 193198090Srdivacky } 194198090Srdivacky return (NULL); 195198090Srdivacky} 196198090Srdivacky 197198396Srdivackygss_ctx_id_t 198198090Srdivackykgss_create_context(gss_OID mech_type) 199198090Srdivacky{ 200198090Srdivacky struct kgss_mech *km; 201198090Srdivacky gss_ctx_id_t ctx; 202198090Srdivacky 203198090Srdivacky LIST_FOREACH(km, &kgss_mechs, km_link) { 204198090Srdivacky if (kgss_oid_equal(km->km_mech_type, mech_type)) 205198090Srdivacky break; 206198090Srdivacky } 207198090Srdivacky if (!km) 208198090Srdivacky return (NULL); 209198090Srdivacky 210198090Srdivacky ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK); 211198090Srdivacky KGSS_INIT(ctx); 212198090Srdivacky 213198090Srdivacky return (ctx); 214198090Srdivacky} 215198090Srdivacky 216198090Srdivackyvoid 217198090Srdivackykgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token) 218198090Srdivacky{ 219198090Srdivacky 220198090Srdivacky KGSS_DELETE(ctx, output_token); 221198090Srdivacky kobj_delete((kobj_t) ctx, M_GSSAPI); 222198090Srdivacky} 223198090Srdivacky 224198090SrdivackyOM_uint32 225198090Srdivackykgss_transfer_context(gss_ctx_id_t ctx) 226198090Srdivacky{ 227198090Srdivacky struct export_sec_context_res res; 228198090Srdivacky struct export_sec_context_args args; 229198090Srdivacky enum clnt_stat stat; 230198396Srdivacky OM_uint32 maj_stat; 231198396Srdivacky 232198090Srdivacky if (!kgss_gssd_handle) 233198090Srdivacky return (GSS_S_FAILURE); 234198090Srdivacky 235198090Srdivacky args.ctx = ctx->handle; 236198090Srdivacky bzero(&res, sizeof(res)); 237198090Srdivacky stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle); 238198090Srdivacky if (stat != RPC_SUCCESS) { 239198090Srdivacky return (GSS_S_FAILURE); 240198090Srdivacky } 241198090Srdivacky 242198090Srdivacky maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token); 243198090Srdivacky ctx->handle = 0; 244198090Srdivacky 245198090Srdivacky xdr_free((xdrproc_t) xdr_export_sec_context_res, &res); 246198090Srdivacky 247198090Srdivacky return (maj_stat); 248198090Srdivacky} 249198090Srdivacky 250198090Srdivackyvoid 251198090Srdivackykgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to) 252198090Srdivacky{ 253198090Srdivacky to->length = from->length; 254198090Srdivacky if (from->length) { 255198090Srdivacky to->value = malloc(from->length, M_GSSAPI, M_WAITOK); 256198090Srdivacky bcopy(from->value, to->value, from->length); 257198090Srdivacky } else { 258198090Srdivacky to->value = NULL; 259198090Srdivacky } 260198090Srdivacky} 261198090Srdivacky 262198090Srdivacky/* 263198090Srdivacky * Acquire the kgss_gssd_handle and return it with a reference count, 264198090Srdivacky * if it is available. 265198090Srdivacky */ 266198090SrdivackyCLIENT * 267198090Srdivackykgss_gssd_client(void) 268198090Srdivacky{ 269198090Srdivacky CLIENT *cl; 270198090Srdivacky 271198090Srdivacky mtx_lock(&kgss_gssd_lock); 272198090Srdivacky cl = kgss_gssd_handle; 273198090Srdivacky if (cl != NULL) 274198090Srdivacky CLNT_ACQUIRE(cl); 275198090Srdivacky mtx_unlock(&kgss_gssd_lock); 276198090Srdivacky return (cl); 277198090Srdivacky} 278198090Srdivacky 279198090Srdivacky/* 280198090Srdivacky * Kernel module glue 281198090Srdivacky */ 282198090Srdivackystatic int 283198090Srdivackykgssapi_modevent(module_t mod, int type, void *data) 284198090Srdivacky{ 285198090Srdivacky int error = 0; 286198090Srdivacky 287198090Srdivacky switch (type) { 288198090Srdivacky 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} 326static moduledata_t kgssapi_mod = { 327 "kgssapi", 328 kgssapi_modevent, 329 NULL, 330}; 331DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY); 332MODULE_DEPEND(kgssapi, krpc, 1, 1, 1); 333MODULE_VERSION(kgssapi, 1); 334