Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * linux/net/sunrpc/auth_gss/auth_gss.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * RPCSEC_GSS client authentication. |
| 5 | * |
| 6 | * Copyright (c) 2000 The Regents of the University of Michigan. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Dug Song <dugsong@monkey.org> |
| 10 | * Andy Adamson <andros@umich.edu> |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * |
| 16 | * 1. Redistributions of source code must retain the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer. |
| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer in the |
| 20 | * documentation and/or other materials provided with the distribution. |
| 21 | * 3. Neither the name of the University nor the names of its |
| 22 | * contributors may be used to endorse or promote products derived |
| 23 | * from this software without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 26 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 27 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 28 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 36 | * |
| 37 | * $Id$ |
| 38 | */ |
| 39 | |
| 40 | |
| 41 | #include <linux/module.h> |
| 42 | #include <linux/init.h> |
| 43 | #include <linux/types.h> |
| 44 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/sched.h> |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 46 | #include <linux/pagemap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/sunrpc/clnt.h> |
| 48 | #include <linux/sunrpc/auth.h> |
| 49 | #include <linux/sunrpc/auth_gss.h> |
| 50 | #include <linux/sunrpc/svcauth_gss.h> |
| 51 | #include <linux/sunrpc/gss_err.h> |
| 52 | #include <linux/workqueue.h> |
| 53 | #include <linux/sunrpc/rpc_pipe_fs.h> |
| 54 | #include <linux/sunrpc/gss_api.h> |
| 55 | #include <asm/uaccess.h> |
| 56 | |
| 57 | static struct rpc_authops authgss_ops; |
| 58 | |
| 59 | static struct rpc_credops gss_credops; |
| 60 | |
| 61 | #ifdef RPC_DEBUG |
| 62 | # define RPCDBG_FACILITY RPCDBG_AUTH |
| 63 | #endif |
| 64 | |
| 65 | #define NFS_NGROUPS 16 |
| 66 | |
| 67 | #define GSS_CRED_EXPIRE (60 * HZ) /* XXX: reasonable? */ |
| 68 | #define GSS_CRED_SLACK 1024 /* XXX: unused */ |
| 69 | /* length of a krb5 verifier (48), plus data added before arguments when |
| 70 | * using integrity (two 4-byte integers): */ |
Olga Kornievskaia | adeb813 | 2006-12-04 20:22:34 -0500 | [diff] [blame] | 71 | #define GSS_VERF_SLACK 100 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* XXX this define must match the gssd define |
| 74 | * as it is passed to gssd to signal the use of |
| 75 | * machine creds should be part of the shared rpc interface */ |
| 76 | |
| 77 | #define CA_RUN_AS_MACHINE 0x00000200 |
| 78 | |
| 79 | /* dump the buffer in `emacs-hexl' style */ |
| 80 | #define isprint(c) ((c > 0x1f) && (c < 0x7f)) |
| 81 | |
| 82 | static DEFINE_RWLOCK(gss_ctx_lock); |
| 83 | |
| 84 | struct gss_auth { |
| 85 | struct rpc_auth rpc_auth; |
| 86 | struct gss_api_mech *mech; |
| 87 | enum rpc_gss_svc service; |
| 88 | struct list_head upcalls; |
| 89 | struct rpc_clnt *client; |
| 90 | struct dentry *dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | spinlock_t lock; |
| 92 | }; |
| 93 | |
| 94 | static void gss_destroy_ctx(struct gss_cl_ctx *); |
| 95 | static struct rpc_pipe_ops gss_upcall_ops; |
| 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | static inline struct gss_cl_ctx * |
| 98 | gss_get_ctx(struct gss_cl_ctx *ctx) |
| 99 | { |
| 100 | atomic_inc(&ctx->count); |
| 101 | return ctx; |
| 102 | } |
| 103 | |
| 104 | static inline void |
| 105 | gss_put_ctx(struct gss_cl_ctx *ctx) |
| 106 | { |
| 107 | if (atomic_dec_and_test(&ctx->count)) |
| 108 | gss_destroy_ctx(ctx); |
| 109 | } |
| 110 | |
| 111 | static void |
| 112 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) |
| 113 | { |
| 114 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 115 | struct gss_cl_ctx *old; |
| 116 | write_lock(&gss_ctx_lock); |
| 117 | old = gss_cred->gc_ctx; |
| 118 | gss_cred->gc_ctx = ctx; |
| 119 | cred->cr_flags |= RPCAUTH_CRED_UPTODATE; |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 120 | cred->cr_flags &= ~RPCAUTH_CRED_NEW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | write_unlock(&gss_ctx_lock); |
| 122 | if (old) |
| 123 | gss_put_ctx(old); |
| 124 | } |
| 125 | |
| 126 | static int |
| 127 | gss_cred_is_uptodate_ctx(struct rpc_cred *cred) |
| 128 | { |
| 129 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 130 | int res = 0; |
| 131 | |
| 132 | read_lock(&gss_ctx_lock); |
| 133 | if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx) |
| 134 | res = 1; |
| 135 | read_unlock(&gss_ctx_lock); |
| 136 | return res; |
| 137 | } |
| 138 | |
| 139 | static const void * |
| 140 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) |
| 141 | { |
| 142 | const void *q = (const void *)((const char *)p + len); |
| 143 | if (unlikely(q > end || q < p)) |
| 144 | return ERR_PTR(-EFAULT); |
| 145 | memcpy(res, p, len); |
| 146 | return q; |
| 147 | } |
| 148 | |
| 149 | static inline const void * |
| 150 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) |
| 151 | { |
| 152 | const void *q; |
| 153 | unsigned int len; |
| 154 | |
| 155 | p = simple_get_bytes(p, end, &len, sizeof(len)); |
| 156 | if (IS_ERR(p)) |
| 157 | return p; |
| 158 | q = (const void *)((const char *)p + len); |
| 159 | if (unlikely(q > end || q < p)) |
| 160 | return ERR_PTR(-EFAULT); |
Arnaldo Carvalho de Melo | e69062b | 2006-11-21 01:21:34 -0200 | [diff] [blame] | 161 | dest->data = kmemdup(p, len, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (unlikely(dest->data == NULL)) |
| 163 | return ERR_PTR(-ENOMEM); |
| 164 | dest->len = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | return q; |
| 166 | } |
| 167 | |
| 168 | static struct gss_cl_ctx * |
| 169 | gss_cred_get_ctx(struct rpc_cred *cred) |
| 170 | { |
| 171 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 172 | struct gss_cl_ctx *ctx = NULL; |
| 173 | |
| 174 | read_lock(&gss_ctx_lock); |
| 175 | if (gss_cred->gc_ctx) |
| 176 | ctx = gss_get_ctx(gss_cred->gc_ctx); |
| 177 | read_unlock(&gss_ctx_lock); |
| 178 | return ctx; |
| 179 | } |
| 180 | |
| 181 | static struct gss_cl_ctx * |
| 182 | gss_alloc_context(void) |
| 183 | { |
| 184 | struct gss_cl_ctx *ctx; |
| 185 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 186 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | if (ctx != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
| 189 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ |
| 190 | spin_lock_init(&ctx->gc_seq_lock); |
| 191 | atomic_set(&ctx->count,1); |
| 192 | } |
| 193 | return ctx; |
| 194 | } |
| 195 | |
| 196 | #define GSSD_MIN_TIMEOUT (60 * 60) |
| 197 | static const void * |
| 198 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) |
| 199 | { |
| 200 | const void *q; |
| 201 | unsigned int seclen; |
| 202 | unsigned int timeout; |
| 203 | u32 window_size; |
| 204 | int ret; |
| 205 | |
| 206 | /* First unsigned int gives the lifetime (in seconds) of the cred */ |
| 207 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
| 208 | if (IS_ERR(p)) |
| 209 | goto err; |
| 210 | if (timeout == 0) |
| 211 | timeout = GSSD_MIN_TIMEOUT; |
| 212 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; |
| 213 | /* Sequence number window. Determines the maximum number of simultaneous requests */ |
| 214 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
| 215 | if (IS_ERR(p)) |
| 216 | goto err; |
| 217 | ctx->gc_win = window_size; |
| 218 | /* gssd signals an error by passing ctx->gc_win = 0: */ |
| 219 | if (ctx->gc_win == 0) { |
| 220 | /* in which case, p points to an error code which we ignore */ |
| 221 | p = ERR_PTR(-EACCES); |
| 222 | goto err; |
| 223 | } |
| 224 | /* copy the opaque wire context */ |
| 225 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); |
| 226 | if (IS_ERR(p)) |
| 227 | goto err; |
| 228 | /* import the opaque security context */ |
| 229 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); |
| 230 | if (IS_ERR(p)) |
| 231 | goto err; |
| 232 | q = (const void *)((const char *)p + seclen); |
| 233 | if (unlikely(q > end || q < p)) { |
| 234 | p = ERR_PTR(-EFAULT); |
| 235 | goto err; |
| 236 | } |
| 237 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); |
| 238 | if (ret < 0) { |
| 239 | p = ERR_PTR(ret); |
| 240 | goto err; |
| 241 | } |
| 242 | return q; |
| 243 | err: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 244 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | return p; |
| 246 | } |
| 247 | |
| 248 | |
| 249 | struct gss_upcall_msg { |
| 250 | atomic_t count; |
| 251 | uid_t uid; |
| 252 | struct rpc_pipe_msg msg; |
| 253 | struct list_head list; |
| 254 | struct gss_auth *auth; |
| 255 | struct rpc_wait_queue rpc_waitqueue; |
| 256 | wait_queue_head_t waitqueue; |
| 257 | struct gss_cl_ctx *ctx; |
| 258 | }; |
| 259 | |
| 260 | static void |
| 261 | gss_release_msg(struct gss_upcall_msg *gss_msg) |
| 262 | { |
| 263 | if (!atomic_dec_and_test(&gss_msg->count)) |
| 264 | return; |
| 265 | BUG_ON(!list_empty(&gss_msg->list)); |
| 266 | if (gss_msg->ctx != NULL) |
| 267 | gss_put_ctx(gss_msg->ctx); |
| 268 | kfree(gss_msg); |
| 269 | } |
| 270 | |
| 271 | static struct gss_upcall_msg * |
| 272 | __gss_find_upcall(struct gss_auth *gss_auth, uid_t uid) |
| 273 | { |
| 274 | struct gss_upcall_msg *pos; |
| 275 | list_for_each_entry(pos, &gss_auth->upcalls, list) { |
| 276 | if (pos->uid != uid) |
| 277 | continue; |
| 278 | atomic_inc(&pos->count); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 279 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | return pos; |
| 281 | } |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 282 | dprintk("RPC: gss_find_upcall found nothing\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | return NULL; |
| 284 | } |
| 285 | |
| 286 | /* Try to add a upcall to the pipefs queue. |
| 287 | * If an upcall owned by our uid already exists, then we return a reference |
| 288 | * to that upcall instead of adding the new upcall. |
| 289 | */ |
| 290 | static inline struct gss_upcall_msg * |
| 291 | gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) |
| 292 | { |
| 293 | struct gss_upcall_msg *old; |
| 294 | |
| 295 | spin_lock(&gss_auth->lock); |
| 296 | old = __gss_find_upcall(gss_auth, gss_msg->uid); |
| 297 | if (old == NULL) { |
| 298 | atomic_inc(&gss_msg->count); |
| 299 | list_add(&gss_msg->list, &gss_auth->upcalls); |
| 300 | } else |
| 301 | gss_msg = old; |
| 302 | spin_unlock(&gss_auth->lock); |
| 303 | return gss_msg; |
| 304 | } |
| 305 | |
| 306 | static void |
| 307 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| 308 | { |
| 309 | if (list_empty(&gss_msg->list)) |
| 310 | return; |
| 311 | list_del_init(&gss_msg->list); |
| 312 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| 313 | wake_up_all(&gss_msg->waitqueue); |
| 314 | atomic_dec(&gss_msg->count); |
| 315 | } |
| 316 | |
| 317 | static void |
| 318 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| 319 | { |
| 320 | struct gss_auth *gss_auth = gss_msg->auth; |
| 321 | |
| 322 | spin_lock(&gss_auth->lock); |
| 323 | __gss_unhash_msg(gss_msg); |
| 324 | spin_unlock(&gss_auth->lock); |
| 325 | } |
| 326 | |
| 327 | static void |
| 328 | gss_upcall_callback(struct rpc_task *task) |
| 329 | { |
| 330 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, |
| 331 | struct gss_cred, gc_base); |
| 332 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; |
| 333 | |
| 334 | BUG_ON(gss_msg == NULL); |
| 335 | if (gss_msg->ctx) |
| 336 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); |
| 337 | else |
| 338 | task->tk_status = gss_msg->msg.errno; |
| 339 | spin_lock(&gss_msg->auth->lock); |
| 340 | gss_cred->gc_upcall = NULL; |
| 341 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| 342 | spin_unlock(&gss_msg->auth->lock); |
| 343 | gss_release_msg(gss_msg); |
| 344 | } |
| 345 | |
| 346 | static inline struct gss_upcall_msg * |
| 347 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) |
| 348 | { |
| 349 | struct gss_upcall_msg *gss_msg; |
| 350 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 351 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | if (gss_msg != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | INIT_LIST_HEAD(&gss_msg->list); |
| 354 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); |
| 355 | init_waitqueue_head(&gss_msg->waitqueue); |
| 356 | atomic_set(&gss_msg->count, 1); |
| 357 | gss_msg->msg.data = &gss_msg->uid; |
| 358 | gss_msg->msg.len = sizeof(gss_msg->uid); |
| 359 | gss_msg->uid = uid; |
| 360 | gss_msg->auth = gss_auth; |
| 361 | } |
| 362 | return gss_msg; |
| 363 | } |
| 364 | |
| 365 | static struct gss_upcall_msg * |
| 366 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) |
| 367 | { |
| 368 | struct gss_upcall_msg *gss_new, *gss_msg; |
| 369 | |
| 370 | gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); |
| 371 | if (gss_new == NULL) |
| 372 | return ERR_PTR(-ENOMEM); |
| 373 | gss_msg = gss_add_msg(gss_auth, gss_new); |
| 374 | if (gss_msg == gss_new) { |
| 375 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); |
| 376 | if (res) { |
| 377 | gss_unhash_msg(gss_new); |
| 378 | gss_msg = ERR_PTR(res); |
| 379 | } |
| 380 | } else |
| 381 | gss_release_msg(gss_new); |
| 382 | return gss_msg; |
| 383 | } |
| 384 | |
| 385 | static inline int |
| 386 | gss_refresh_upcall(struct rpc_task *task) |
| 387 | { |
| 388 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 389 | struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth, |
| 390 | struct gss_auth, rpc_auth); |
| 391 | struct gss_cred *gss_cred = container_of(cred, |
| 392 | struct gss_cred, gc_base); |
| 393 | struct gss_upcall_msg *gss_msg; |
| 394 | int err = 0; |
| 395 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 396 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
| 397 | cred->cr_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
| 399 | if (IS_ERR(gss_msg)) { |
| 400 | err = PTR_ERR(gss_msg); |
| 401 | goto out; |
| 402 | } |
| 403 | spin_lock(&gss_auth->lock); |
| 404 | if (gss_cred->gc_upcall != NULL) |
| 405 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); |
| 406 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
| 407 | task->tk_timeout = 0; |
| 408 | gss_cred->gc_upcall = gss_msg; |
| 409 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ |
| 410 | atomic_inc(&gss_msg->count); |
| 411 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); |
| 412 | } else |
| 413 | err = gss_msg->msg.errno; |
| 414 | spin_unlock(&gss_auth->lock); |
| 415 | gss_release_msg(gss_msg); |
| 416 | out: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 417 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
| 418 | task->tk_pid, cred->cr_uid, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | return err; |
| 420 | } |
| 421 | |
| 422 | static inline int |
| 423 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) |
| 424 | { |
| 425 | struct rpc_cred *cred = &gss_cred->gc_base; |
| 426 | struct gss_upcall_msg *gss_msg; |
| 427 | DEFINE_WAIT(wait); |
| 428 | int err = 0; |
| 429 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 430 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
| 432 | if (IS_ERR(gss_msg)) { |
| 433 | err = PTR_ERR(gss_msg); |
| 434 | goto out; |
| 435 | } |
| 436 | for (;;) { |
| 437 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); |
| 438 | spin_lock(&gss_auth->lock); |
| 439 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
| 440 | spin_unlock(&gss_auth->lock); |
| 441 | break; |
| 442 | } |
| 443 | spin_unlock(&gss_auth->lock); |
| 444 | if (signalled()) { |
| 445 | err = -ERESTARTSYS; |
| 446 | goto out_intr; |
| 447 | } |
| 448 | schedule(); |
| 449 | } |
| 450 | if (gss_msg->ctx) |
| 451 | gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); |
| 452 | else |
| 453 | err = gss_msg->msg.errno; |
| 454 | out_intr: |
| 455 | finish_wait(&gss_msg->waitqueue, &wait); |
| 456 | gss_release_msg(gss_msg); |
| 457 | out: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 458 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
| 459 | cred->cr_uid, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | return err; |
| 461 | } |
| 462 | |
| 463 | static ssize_t |
| 464 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
| 465 | char __user *dst, size_t buflen) |
| 466 | { |
| 467 | char *data = (char *)msg->data + msg->copied; |
| 468 | ssize_t mlen = msg->len; |
| 469 | ssize_t left; |
| 470 | |
| 471 | if (mlen > buflen) |
| 472 | mlen = buflen; |
| 473 | left = copy_to_user(dst, data, mlen); |
| 474 | if (left < 0) { |
| 475 | msg->errno = left; |
| 476 | return left; |
| 477 | } |
| 478 | mlen -= left; |
| 479 | msg->copied += mlen; |
| 480 | msg->errno = 0; |
| 481 | return mlen; |
| 482 | } |
| 483 | |
| 484 | #define MSG_BUF_MAXSIZE 1024 |
| 485 | |
| 486 | static ssize_t |
| 487 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) |
| 488 | { |
| 489 | const void *p, *end; |
| 490 | void *buf; |
| 491 | struct rpc_clnt *clnt; |
| 492 | struct gss_auth *gss_auth; |
| 493 | struct rpc_cred *cred; |
| 494 | struct gss_upcall_msg *gss_msg; |
| 495 | struct gss_cl_ctx *ctx; |
| 496 | uid_t uid; |
| 497 | int err = -EFBIG; |
| 498 | |
| 499 | if (mlen > MSG_BUF_MAXSIZE) |
| 500 | goto out; |
| 501 | err = -ENOMEM; |
| 502 | buf = kmalloc(mlen, GFP_KERNEL); |
| 503 | if (!buf) |
| 504 | goto out; |
| 505 | |
Josef Sipek | 303b46b | 2006-12-08 02:37:42 -0800 | [diff] [blame] | 506 | clnt = RPC_I(filp->f_path.dentry->d_inode)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | err = -EFAULT; |
| 508 | if (copy_from_user(buf, src, mlen)) |
| 509 | goto err; |
| 510 | |
| 511 | end = (const void *)((char *)buf + mlen); |
| 512 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); |
| 513 | if (IS_ERR(p)) { |
| 514 | err = PTR_ERR(p); |
| 515 | goto err; |
| 516 | } |
| 517 | |
| 518 | err = -ENOMEM; |
| 519 | ctx = gss_alloc_context(); |
| 520 | if (ctx == NULL) |
| 521 | goto err; |
| 522 | err = 0; |
| 523 | gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth); |
| 524 | p = gss_fill_context(p, end, ctx, gss_auth->mech); |
| 525 | if (IS_ERR(p)) { |
| 526 | err = PTR_ERR(p); |
| 527 | if (err != -EACCES) |
| 528 | goto err_put_ctx; |
| 529 | } |
| 530 | spin_lock(&gss_auth->lock); |
| 531 | gss_msg = __gss_find_upcall(gss_auth, uid); |
| 532 | if (gss_msg) { |
| 533 | if (err == 0 && gss_msg->ctx == NULL) |
| 534 | gss_msg->ctx = gss_get_ctx(ctx); |
| 535 | gss_msg->msg.errno = err; |
| 536 | __gss_unhash_msg(gss_msg); |
| 537 | spin_unlock(&gss_auth->lock); |
| 538 | gss_release_msg(gss_msg); |
| 539 | } else { |
| 540 | struct auth_cred acred = { .uid = uid }; |
| 541 | spin_unlock(&gss_auth->lock); |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 542 | cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, RPCAUTH_LOOKUP_NEW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | if (IS_ERR(cred)) { |
| 544 | err = PTR_ERR(cred); |
| 545 | goto err_put_ctx; |
| 546 | } |
| 547 | gss_cred_set_ctx(cred, gss_get_ctx(ctx)); |
| 548 | } |
| 549 | gss_put_ctx(ctx); |
| 550 | kfree(buf); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 551 | dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | return mlen; |
| 553 | err_put_ctx: |
| 554 | gss_put_ctx(ctx); |
| 555 | err: |
| 556 | kfree(buf); |
| 557 | out: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 558 | dprintk("RPC: gss_pipe_downcall returning %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | return err; |
| 560 | } |
| 561 | |
| 562 | static void |
| 563 | gss_pipe_release(struct inode *inode) |
| 564 | { |
| 565 | struct rpc_inode *rpci = RPC_I(inode); |
| 566 | struct rpc_clnt *clnt; |
| 567 | struct rpc_auth *auth; |
| 568 | struct gss_auth *gss_auth; |
| 569 | |
| 570 | clnt = rpci->private; |
| 571 | auth = clnt->cl_auth; |
| 572 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| 573 | spin_lock(&gss_auth->lock); |
| 574 | while (!list_empty(&gss_auth->upcalls)) { |
| 575 | struct gss_upcall_msg *gss_msg; |
| 576 | |
| 577 | gss_msg = list_entry(gss_auth->upcalls.next, |
| 578 | struct gss_upcall_msg, list); |
| 579 | gss_msg->msg.errno = -EPIPE; |
| 580 | atomic_inc(&gss_msg->count); |
| 581 | __gss_unhash_msg(gss_msg); |
| 582 | spin_unlock(&gss_auth->lock); |
| 583 | gss_release_msg(gss_msg); |
| 584 | spin_lock(&gss_auth->lock); |
| 585 | } |
| 586 | spin_unlock(&gss_auth->lock); |
| 587 | } |
| 588 | |
| 589 | static void |
| 590 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
| 591 | { |
| 592 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); |
| 593 | static unsigned long ratelimit; |
| 594 | |
| 595 | if (msg->errno < 0) { |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 596 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | gss_msg); |
| 598 | atomic_inc(&gss_msg->count); |
| 599 | gss_unhash_msg(gss_msg); |
Trond Myklebust | 48e4918 | 2005-12-19 17:11:22 -0500 | [diff] [blame] | 600 | if (msg->errno == -ETIMEDOUT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | unsigned long now = jiffies; |
| 602 | if (time_after(now, ratelimit)) { |
| 603 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" |
| 604 | "Please check user daemon is running!\n"); |
| 605 | ratelimit = now + 15*HZ; |
| 606 | } |
| 607 | } |
| 608 | gss_release_msg(gss_msg); |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * NOTE: we have the opportunity to use different |
| 614 | * parameters based on the input flavor (which must be a pseudoflavor) |
| 615 | */ |
| 616 | static struct rpc_auth * |
| 617 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) |
| 618 | { |
| 619 | struct gss_auth *gss_auth; |
| 620 | struct rpc_auth * auth; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 621 | int err = -ENOMEM; /* XXX? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 623 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
| 625 | if (!try_module_get(THIS_MODULE)) |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 626 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
| 628 | goto out_dec; |
| 629 | gss_auth->client = clnt; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 630 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
| 632 | if (!gss_auth->mech) { |
| 633 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!", |
| 634 | __FUNCTION__, flavor); |
| 635 | goto err_free; |
| 636 | } |
| 637 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); |
J. Bruce Fields | 438b6fd | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 638 | if (gss_auth->service == 0) |
| 639 | goto err_put_mech; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | INIT_LIST_HEAD(&gss_auth->upcalls); |
| 641 | spin_lock_init(&gss_auth->lock); |
| 642 | auth = &gss_auth->rpc_auth; |
| 643 | auth->au_cslack = GSS_CRED_SLACK >> 2; |
| 644 | auth->au_rslack = GSS_VERF_SLACK >> 2; |
| 645 | auth->au_ops = &authgss_ops; |
| 646 | auth->au_flavor = flavor; |
| 647 | atomic_set(&auth->au_count, 1); |
| 648 | |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 649 | err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE); |
| 650 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | goto err_put_mech; |
| 652 | |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 653 | gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, |
| 654 | clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 655 | if (IS_ERR(gss_auth->dentry)) { |
| 656 | err = PTR_ERR(gss_auth->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | goto err_put_mech; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 658 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
| 660 | return auth; |
| 661 | err_put_mech: |
| 662 | gss_mech_put(gss_auth->mech); |
| 663 | err_free: |
| 664 | kfree(gss_auth); |
| 665 | out_dec: |
| 666 | module_put(THIS_MODULE); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 667 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | static void |
| 671 | gss_destroy(struct rpc_auth *auth) |
| 672 | { |
| 673 | struct gss_auth *gss_auth; |
| 674 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 675 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
| 676 | auth, auth->au_flavor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
Trond Myklebust | 5d67476 | 2006-07-31 14:11:48 -0700 | [diff] [blame] | 679 | rpc_unlink(gss_auth->dentry); |
Trond Myklebust | 12de3b3 | 2006-03-20 13:44:09 -0500 | [diff] [blame] | 680 | gss_auth->dentry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | gss_mech_put(gss_auth->mech); |
| 682 | |
| 683 | rpcauth_free_credcache(auth); |
| 684 | kfree(gss_auth); |
| 685 | module_put(THIS_MODULE); |
| 686 | } |
| 687 | |
| 688 | /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure |
| 689 | * to create a new cred or context, so they check that things have been |
| 690 | * allocated before freeing them. */ |
| 691 | static void |
| 692 | gss_destroy_ctx(struct gss_cl_ctx *ctx) |
| 693 | { |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 694 | dprintk("RPC: gss_destroy_ctx\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | if (ctx->gc_gss_ctx) |
| 697 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
| 698 | |
| 699 | kfree(ctx->gc_wire_ctx.data); |
| 700 | kfree(ctx); |
| 701 | } |
| 702 | |
| 703 | static void |
| 704 | gss_destroy_cred(struct rpc_cred *rc) |
| 705 | { |
| 706 | struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base); |
| 707 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 708 | dprintk("RPC: gss_destroy_cred \n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
| 710 | if (cred->gc_ctx) |
| 711 | gss_put_ctx(cred->gc_ctx); |
| 712 | kfree(cred); |
| 713 | } |
| 714 | |
| 715 | /* |
| 716 | * Lookup RPCSEC_GSS cred for the current process |
| 717 | */ |
| 718 | static struct rpc_cred * |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 719 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | { |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 721 | return rpcauth_lookup_credcache(auth, acred, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } |
| 723 | |
| 724 | static struct rpc_cred * |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 725 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | { |
| 727 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| 728 | struct gss_cred *cred = NULL; |
| 729 | int err = -ENOMEM; |
| 730 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 731 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | acred->uid, auth->au_flavor); |
| 733 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 734 | if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | goto out_err; |
| 736 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | atomic_set(&cred->gc_count, 1); |
| 738 | cred->gc_uid = acred->uid; |
| 739 | /* |
| 740 | * Note: in order to force a call to call_refresh(), we deliberately |
| 741 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. |
| 742 | */ |
| 743 | cred->gc_flags = 0; |
| 744 | cred->gc_base.cr_ops = &gss_credops; |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 745 | cred->gc_base.cr_flags = RPCAUTH_CRED_NEW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | cred->gc_service = gss_auth->service; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | return &cred->gc_base; |
| 748 | |
| 749 | out_err: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 750 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | return ERR_PTR(err); |
| 752 | } |
| 753 | |
| 754 | static int |
Trond Myklebust | fba3bad | 2006-02-01 12:19:27 -0500 | [diff] [blame] | 755 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) |
| 756 | { |
| 757 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| 758 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); |
| 759 | int err; |
| 760 | |
| 761 | do { |
| 762 | err = gss_create_upcall(gss_auth, gss_cred); |
| 763 | } while (err == -EAGAIN); |
| 764 | return err; |
| 765 | } |
| 766 | |
| 767 | static int |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 768 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | { |
| 770 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); |
| 771 | |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 772 | /* |
| 773 | * If the searchflags have set RPCAUTH_LOOKUP_NEW, then |
| 774 | * we don't really care if the credential has expired or not, |
| 775 | * since the caller should be prepared to reinitialise it. |
| 776 | */ |
| 777 | if ((flags & RPCAUTH_LOOKUP_NEW) && (rc->cr_flags & RPCAUTH_CRED_NEW)) |
| 778 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | /* Don't match with creds that have expired. */ |
| 780 | if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
| 781 | return 0; |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 782 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | return (rc->cr_uid == acred->uid); |
| 784 | } |
| 785 | |
| 786 | /* |
| 787 | * Marshal credentials. |
| 788 | * Maybe we should keep a cached credential for performance reasons. |
| 789 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 790 | static __be32 * |
| 791 | gss_marshal(struct rpc_task *task, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | { |
| 793 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 794 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 795 | gc_base); |
| 796 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 797 | __be32 *cred_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | struct rpc_rqst *req = task->tk_rqstp; |
| 799 | u32 maj_stat = 0; |
| 800 | struct xdr_netobj mic; |
| 801 | struct kvec iov; |
| 802 | struct xdr_buf verf_buf; |
| 803 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 804 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
| 806 | *p++ = htonl(RPC_AUTH_GSS); |
| 807 | cred_len = p++; |
| 808 | |
| 809 | spin_lock(&ctx->gc_seq_lock); |
| 810 | req->rq_seqno = ctx->gc_seq++; |
| 811 | spin_unlock(&ctx->gc_seq_lock); |
| 812 | |
| 813 | *p++ = htonl((u32) RPC_GSS_VERSION); |
| 814 | *p++ = htonl((u32) ctx->gc_proc); |
| 815 | *p++ = htonl((u32) req->rq_seqno); |
| 816 | *p++ = htonl((u32) gss_cred->gc_service); |
| 817 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); |
| 818 | *cred_len = htonl((p - (cred_len + 1)) << 2); |
| 819 | |
| 820 | /* We compute the checksum for the verifier over the xdr-encoded bytes |
| 821 | * starting with the xid and ending at the end of the credential: */ |
Chuck Lever | 808012f | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 822 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
| 823 | req->rq_snd_buf.head[0].iov_base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
| 825 | xdr_buf_from_iov(&iov, &verf_buf); |
| 826 | |
| 827 | /* set verifier flavor*/ |
| 828 | *p++ = htonl(RPC_AUTH_GSS); |
| 829 | |
| 830 | mic.data = (u8 *)(p + 1); |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 831 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
| 833 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; |
| 834 | } else if (maj_stat != 0) { |
| 835 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); |
| 836 | goto out_put_ctx; |
| 837 | } |
| 838 | p = xdr_encode_opaque(p, NULL, mic.len); |
| 839 | gss_put_ctx(ctx); |
| 840 | return p; |
| 841 | out_put_ctx: |
| 842 | gss_put_ctx(ctx); |
| 843 | return NULL; |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * Refresh credentials. XXX - finish |
| 848 | */ |
| 849 | static int |
| 850 | gss_refresh(struct rpc_task *task) |
| 851 | { |
| 852 | |
| 853 | if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) |
| 854 | return gss_refresh_upcall(task); |
| 855 | return 0; |
| 856 | } |
| 857 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 858 | static __be32 * |
| 859 | gss_validate(struct rpc_task *task, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | { |
| 861 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 863 | __be32 seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | struct kvec iov; |
| 865 | struct xdr_buf verf_buf; |
| 866 | struct xdr_netobj mic; |
| 867 | u32 flav,len; |
| 868 | u32 maj_stat; |
| 869 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 870 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
| 872 | flav = ntohl(*p++); |
| 873 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) |
| 874 | goto out_bad; |
| 875 | if (flav != RPC_AUTH_GSS) |
| 876 | goto out_bad; |
| 877 | seq = htonl(task->tk_rqstp->rq_seqno); |
| 878 | iov.iov_base = &seq; |
| 879 | iov.iov_len = sizeof(seq); |
| 880 | xdr_buf_from_iov(&iov, &verf_buf); |
| 881 | mic.data = (u8 *)p; |
| 882 | mic.len = len; |
| 883 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 884 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| 886 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; |
| 887 | if (maj_stat) |
| 888 | goto out_bad; |
J. Bruce Fields | 24b2605 | 2005-10-13 16:54:53 -0400 | [diff] [blame] | 889 | /* We leave it to unwrap to calculate au_rslack. For now we just |
| 890 | * calculate the length of the verifier: */ |
| 891 | task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 893 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | task->tk_pid); |
| 895 | return p + XDR_QUADLEN(len); |
| 896 | out_bad: |
| 897 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 898 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | return NULL; |
| 900 | } |
| 901 | |
| 902 | static inline int |
| 903 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 904 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | { |
| 906 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 907 | struct xdr_buf integ_buf; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 908 | __be32 *integ_len = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | struct xdr_netobj mic; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 910 | u32 offset; |
| 911 | __be32 *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | struct kvec *iov; |
| 913 | u32 maj_stat = 0; |
| 914 | int status = -EIO; |
| 915 | |
| 916 | integ_len = p++; |
| 917 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| 918 | *p++ = htonl(rqstp->rq_seqno); |
| 919 | |
| 920 | status = encode(rqstp, p, obj); |
| 921 | if (status) |
| 922 | return status; |
| 923 | |
| 924 | if (xdr_buf_subsegment(snd_buf, &integ_buf, |
| 925 | offset, snd_buf->len - offset)) |
| 926 | return status; |
| 927 | *integ_len = htonl(integ_buf.len); |
| 928 | |
| 929 | /* guess whether we're in the head or the tail: */ |
| 930 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
| 931 | iov = snd_buf->tail; |
| 932 | else |
| 933 | iov = snd_buf->head; |
| 934 | p = iov->iov_base + iov->iov_len; |
| 935 | mic.data = (u8 *)(p + 1); |
| 936 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 937 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | status = -EIO; /* XXX? */ |
| 939 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| 940 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; |
| 941 | else if (maj_stat) |
| 942 | return status; |
| 943 | q = xdr_encode_opaque(p, NULL, mic.len); |
| 944 | |
| 945 | offset = (u8 *)q - (u8 *)p; |
| 946 | iov->iov_len += offset; |
| 947 | snd_buf->len += offset; |
| 948 | return 0; |
| 949 | } |
| 950 | |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 951 | static void |
| 952 | priv_release_snd_buf(struct rpc_rqst *rqstp) |
| 953 | { |
| 954 | int i; |
| 955 | |
| 956 | for (i=0; i < rqstp->rq_enc_pages_num; i++) |
| 957 | __free_page(rqstp->rq_enc_pages[i]); |
| 958 | kfree(rqstp->rq_enc_pages); |
| 959 | } |
| 960 | |
| 961 | static int |
| 962 | alloc_enc_pages(struct rpc_rqst *rqstp) |
| 963 | { |
| 964 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 965 | int first, last, i; |
| 966 | |
| 967 | if (snd_buf->page_len == 0) { |
| 968 | rqstp->rq_enc_pages_num = 0; |
| 969 | return 0; |
| 970 | } |
| 971 | |
| 972 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; |
| 973 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; |
| 974 | rqstp->rq_enc_pages_num = last - first + 1 + 1; |
| 975 | rqstp->rq_enc_pages |
| 976 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), |
| 977 | GFP_NOFS); |
| 978 | if (!rqstp->rq_enc_pages) |
| 979 | goto out; |
| 980 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { |
| 981 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); |
| 982 | if (rqstp->rq_enc_pages[i] == NULL) |
| 983 | goto out_free; |
| 984 | } |
| 985 | rqstp->rq_release_snd_buf = priv_release_snd_buf; |
| 986 | return 0; |
| 987 | out_free: |
| 988 | for (i--; i >= 0; i--) { |
| 989 | __free_page(rqstp->rq_enc_pages[i]); |
| 990 | } |
| 991 | out: |
| 992 | return -EAGAIN; |
| 993 | } |
| 994 | |
| 995 | static inline int |
| 996 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 997 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 998 | { |
| 999 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 1000 | u32 offset; |
| 1001 | u32 maj_stat; |
| 1002 | int status; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1003 | __be32 *opaque_len; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1004 | struct page **inpages; |
| 1005 | int first; |
| 1006 | int pad; |
| 1007 | struct kvec *iov; |
| 1008 | char *tmp; |
| 1009 | |
| 1010 | opaque_len = p++; |
| 1011 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| 1012 | *p++ = htonl(rqstp->rq_seqno); |
| 1013 | |
| 1014 | status = encode(rqstp, p, obj); |
| 1015 | if (status) |
| 1016 | return status; |
| 1017 | |
| 1018 | status = alloc_enc_pages(rqstp); |
| 1019 | if (status) |
| 1020 | return status; |
| 1021 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; |
| 1022 | inpages = snd_buf->pages + first; |
| 1023 | snd_buf->pages = rqstp->rq_enc_pages; |
| 1024 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; |
| 1025 | /* Give the tail its own page, in case we need extra space in the |
| 1026 | * head when wrapping: */ |
| 1027 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
| 1028 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); |
| 1029 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); |
| 1030 | snd_buf->tail[0].iov_base = tmp; |
| 1031 | } |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1032 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1033 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
| 1034 | BUG_ON(snd_buf->len > snd_buf->buflen); |
| 1035 | status = -EIO; |
| 1036 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
| 1037 | * done anyway, so it's safe to put the request on the wire: */ |
| 1038 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| 1039 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; |
| 1040 | else if (maj_stat) |
| 1041 | return status; |
| 1042 | |
| 1043 | *opaque_len = htonl(snd_buf->len - offset); |
| 1044 | /* guess whether we're in the head or the tail: */ |
| 1045 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
| 1046 | iov = snd_buf->tail; |
| 1047 | else |
| 1048 | iov = snd_buf->head; |
| 1049 | p = iov->iov_base + iov->iov_len; |
| 1050 | pad = 3 - ((snd_buf->len - offset - 1) & 3); |
| 1051 | memset(p, 0, pad); |
| 1052 | iov->iov_len += pad; |
| 1053 | snd_buf->len += pad; |
| 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | static int |
| 1059 | gss_wrap_req(struct rpc_task *task, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1060 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | { |
| 1062 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 1063 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 1064 | gc_base); |
| 1065 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
| 1066 | int status = -EIO; |
| 1067 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1068 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
| 1070 | /* The spec seems a little ambiguous here, but I think that not |
| 1071 | * wrapping context destruction requests makes the most sense. |
| 1072 | */ |
| 1073 | status = encode(rqstp, p, obj); |
| 1074 | goto out; |
| 1075 | } |
| 1076 | switch (gss_cred->gc_service) { |
| 1077 | case RPC_GSS_SVC_NONE: |
| 1078 | status = encode(rqstp, p, obj); |
| 1079 | break; |
| 1080 | case RPC_GSS_SVC_INTEGRITY: |
| 1081 | status = gss_wrap_req_integ(cred, ctx, encode, |
| 1082 | rqstp, p, obj); |
| 1083 | break; |
| 1084 | case RPC_GSS_SVC_PRIVACY: |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1085 | status = gss_wrap_req_priv(cred, ctx, encode, |
| 1086 | rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | break; |
| 1088 | } |
| 1089 | out: |
| 1090 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1091 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | return status; |
| 1093 | } |
| 1094 | |
| 1095 | static inline int |
| 1096 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1097 | struct rpc_rqst *rqstp, __be32 **p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | { |
| 1099 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| 1100 | struct xdr_buf integ_buf; |
| 1101 | struct xdr_netobj mic; |
| 1102 | u32 data_offset, mic_offset; |
| 1103 | u32 integ_len; |
| 1104 | u32 maj_stat; |
| 1105 | int status = -EIO; |
| 1106 | |
| 1107 | integ_len = ntohl(*(*p)++); |
| 1108 | if (integ_len & 3) |
| 1109 | return status; |
| 1110 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| 1111 | mic_offset = integ_len + data_offset; |
| 1112 | if (mic_offset > rcv_buf->len) |
| 1113 | return status; |
| 1114 | if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| 1115 | return status; |
| 1116 | |
| 1117 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, |
| 1118 | mic_offset - data_offset)) |
| 1119 | return status; |
| 1120 | |
| 1121 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) |
| 1122 | return status; |
| 1123 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1124 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| 1126 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; |
| 1127 | if (maj_stat != GSS_S_COMPLETE) |
| 1128 | return status; |
| 1129 | return 0; |
| 1130 | } |
| 1131 | |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1132 | static inline int |
| 1133 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1134 | struct rpc_rqst *rqstp, __be32 **p) |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1135 | { |
| 1136 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| 1137 | u32 offset; |
| 1138 | u32 opaque_len; |
| 1139 | u32 maj_stat; |
| 1140 | int status = -EIO; |
| 1141 | |
| 1142 | opaque_len = ntohl(*(*p)++); |
| 1143 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| 1144 | if (offset + opaque_len > rcv_buf->len) |
| 1145 | return status; |
| 1146 | /* remove padding: */ |
| 1147 | rcv_buf->len = offset + opaque_len; |
| 1148 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1149 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1150 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| 1151 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; |
| 1152 | if (maj_stat != GSS_S_COMPLETE) |
| 1153 | return status; |
| 1154 | if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| 1155 | return status; |
| 1156 | |
| 1157 | return 0; |
| 1158 | } |
| 1159 | |
| 1160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | static int |
| 1162 | gss_unwrap_resp(struct rpc_task *task, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1163 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | { |
| 1165 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 1166 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 1167 | gc_base); |
| 1168 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1169 | __be32 *savedp = p; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1170 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
| 1171 | int savedlen = head->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | int status = -EIO; |
| 1173 | |
| 1174 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) |
| 1175 | goto out_decode; |
| 1176 | switch (gss_cred->gc_service) { |
| 1177 | case RPC_GSS_SVC_NONE: |
| 1178 | break; |
| 1179 | case RPC_GSS_SVC_INTEGRITY: |
| 1180 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); |
| 1181 | if (status) |
| 1182 | goto out; |
| 1183 | break; |
| 1184 | case RPC_GSS_SVC_PRIVACY: |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1185 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
| 1186 | if (status) |
| 1187 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | break; |
| 1189 | } |
J. Bruce Fields | 24b2605 | 2005-10-13 16:54:53 -0400 | [diff] [blame] | 1190 | /* take into account extra slack for integrity and privacy cases: */ |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1191 | task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) |
| 1192 | + (savedlen - head->iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | out_decode: |
| 1194 | status = decode(rqstp, p, obj); |
| 1195 | out: |
| 1196 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1197 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | status); |
| 1199 | return status; |
| 1200 | } |
| 1201 | |
| 1202 | static struct rpc_authops authgss_ops = { |
| 1203 | .owner = THIS_MODULE, |
| 1204 | .au_flavor = RPC_AUTH_GSS, |
| 1205 | #ifdef RPC_DEBUG |
| 1206 | .au_name = "RPCSEC_GSS", |
| 1207 | #endif |
| 1208 | .create = gss_create, |
| 1209 | .destroy = gss_destroy, |
| 1210 | .lookup_cred = gss_lookup_cred, |
| 1211 | .crcreate = gss_create_cred |
| 1212 | }; |
| 1213 | |
| 1214 | static struct rpc_credops gss_credops = { |
| 1215 | .cr_name = "AUTH_GSS", |
| 1216 | .crdestroy = gss_destroy_cred, |
Trond Myklebust | fba3bad | 2006-02-01 12:19:27 -0500 | [diff] [blame] | 1217 | .cr_init = gss_cred_init, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | .crmatch = gss_match, |
| 1219 | .crmarshal = gss_marshal, |
| 1220 | .crrefresh = gss_refresh, |
| 1221 | .crvalidate = gss_validate, |
| 1222 | .crwrap_req = gss_wrap_req, |
| 1223 | .crunwrap_resp = gss_unwrap_resp, |
| 1224 | }; |
| 1225 | |
| 1226 | static struct rpc_pipe_ops gss_upcall_ops = { |
| 1227 | .upcall = gss_pipe_upcall, |
| 1228 | .downcall = gss_pipe_downcall, |
| 1229 | .destroy_msg = gss_pipe_destroy_msg, |
| 1230 | .release_pipe = gss_pipe_release, |
| 1231 | }; |
| 1232 | |
| 1233 | /* |
| 1234 | * Initialize RPCSEC_GSS module |
| 1235 | */ |
| 1236 | static int __init init_rpcsec_gss(void) |
| 1237 | { |
| 1238 | int err = 0; |
| 1239 | |
| 1240 | err = rpcauth_register(&authgss_ops); |
| 1241 | if (err) |
| 1242 | goto out; |
| 1243 | err = gss_svc_init(); |
| 1244 | if (err) |
| 1245 | goto out_unregister; |
| 1246 | return 0; |
| 1247 | out_unregister: |
| 1248 | rpcauth_unregister(&authgss_ops); |
| 1249 | out: |
| 1250 | return err; |
| 1251 | } |
| 1252 | |
| 1253 | static void __exit exit_rpcsec_gss(void) |
| 1254 | { |
| 1255 | gss_svc_shutdown(); |
| 1256 | rpcauth_unregister(&authgss_ops); |
| 1257 | } |
| 1258 | |
| 1259 | MODULE_LICENSE("GPL"); |
| 1260 | module_init(init_rpcsec_gss) |
| 1261 | module_exit(exit_rpcsec_gss) |