blob: fc6a43ccd95091154cb7aeff1aa457102efe5e93 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Uwe Zeisbergerf30c2262006-10-03 23:01:26 +02002 * linux/net/sunrpc/auth_gss/auth_gss.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * RPCSEC_GSS client authentication.
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08005 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 */
37
38
39#include <linux/module.h>
40#include <linux/init.h>
41#include <linux/types.h>
42#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/sched.h>
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -040044#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/sunrpc/clnt.h>
46#include <linux/sunrpc/auth.h>
47#include <linux/sunrpc/auth_gss.h>
48#include <linux/sunrpc/svcauth_gss.h>
49#include <linux/sunrpc/gss_err.h>
50#include <linux/workqueue.h>
51#include <linux/sunrpc/rpc_pipe_fs.h>
52#include <linux/sunrpc/gss_api.h>
53#include <asm/uaccess.h>
54
Trond Myklebustf1c0a862007-06-23 20:17:58 -040055static const struct rpc_authops authgss_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Trond Myklebustf1c0a862007-06-23 20:17:58 -040057static const struct rpc_credops gss_credops;
Trond Myklebust0df7fb72007-06-26 17:04:57 -040058static const struct rpc_credops gss_nullops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60#ifdef RPC_DEBUG
61# define RPCDBG_FACILITY RPCDBG_AUTH
62#endif
63
\\\"J. Bruce Fields\\\d25a03c2008-06-09 16:51:34 -040064#define GSS_CRED_SLACK 1024
Linus Torvalds1da177e2005-04-16 15:20:36 -070065/* length of a krb5 verifier (48), plus data added before arguments when
66 * using integrity (two 4-byte integers): */
Olga Kornievskaiaadeb8132006-12-04 20:22:34 -050067#define GSS_VERF_SLACK 100
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069struct gss_auth {
Trond Myklebust0285ed12007-06-27 14:29:12 -040070 struct kref kref;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 struct rpc_auth rpc_auth;
72 struct gss_api_mech *mech;
73 enum rpc_gss_svc service;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 struct rpc_clnt *client;
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -050075 /*
76 * There are two upcall pipes; dentry[1], named "gssd", is used
77 * for the new text-based upcall; dentry[0] is named after the
78 * mechanism (for example, "krb5") and exists for
79 * backwards-compatibility with older gssd's.
80 */
81 struct dentry *dentry[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -070082};
83
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -050084/* pipe_version >= 0 if and only if someone has a pipe open. */
85static int pipe_version = -1;
\"J. Bruce Fields\cf819392008-12-23 16:10:19 -050086static atomic_t pipe_users = ATOMIC_INIT(0);
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -050087static DEFINE_SPINLOCK(pipe_version_lock);
88static struct rpc_wait_queue pipe_version_rpc_waitqueue;
89static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
\"J. Bruce Fields\cf819392008-12-23 16:10:19 -050090
Trond Myklebust5d28dc82007-06-26 19:18:38 -040091static void gss_free_ctx(struct gss_cl_ctx *);
Trond Myklebustb693ba42009-08-09 15:14:15 -040092static const struct rpc_pipe_ops gss_upcall_ops_v0;
93static const struct rpc_pipe_ops gss_upcall_ops_v1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095static inline struct gss_cl_ctx *
96gss_get_ctx(struct gss_cl_ctx *ctx)
97{
98 atomic_inc(&ctx->count);
99 return ctx;
100}
101
102static inline void
103gss_put_ctx(struct gss_cl_ctx *ctx)
104{
105 if (atomic_dec_and_test(&ctx->count))
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400106 gss_free_ctx(ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400109/* gss_cred_set_ctx:
110 * called by gss_upcall_callback and gss_create_upcall in order
111 * to set the gss context. The actual exchange of an old context
112 * and a new one is protected by the inode->i_lock.
113 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114static void
115gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
116{
117 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400118
Trond Myklebustcd019f72008-04-17 17:03:58 -0400119 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
120 return;
Trond Myklebust7b6962b2008-04-17 16:53:01 -0400121 gss_get_ctx(ctx);
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400122 rcu_assign_pointer(gss_cred->gc_ctx, ctx);
Trond Myklebustfc432dd2007-06-25 10:15:15 -0400123 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
Trond Myklebustcd019f72008-04-17 17:03:58 -0400124 smp_mb__before_clear_bit();
Trond Myklebustfc432dd2007-06-25 10:15:15 -0400125 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126}
127
128static const void *
129simple_get_bytes(const void *p, const void *end, void *res, size_t len)
130{
131 const void *q = (const void *)((const char *)p + len);
132 if (unlikely(q > end || q < p))
133 return ERR_PTR(-EFAULT);
134 memcpy(res, p, len);
135 return q;
136}
137
138static inline const void *
139simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
140{
141 const void *q;
142 unsigned int len;
143
144 p = simple_get_bytes(p, end, &len, sizeof(len));
145 if (IS_ERR(p))
146 return p;
147 q = (const void *)((const char *)p + len);
148 if (unlikely(q > end || q < p))
149 return ERR_PTR(-EFAULT);
Trond Myklebust0f38b872008-06-10 18:31:01 -0400150 dest->data = kmemdup(p, len, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 if (unlikely(dest->data == NULL))
152 return ERR_PTR(-ENOMEM);
153 dest->len = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 return q;
155}
156
157static struct gss_cl_ctx *
158gss_cred_get_ctx(struct rpc_cred *cred)
159{
160 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
161 struct gss_cl_ctx *ctx = NULL;
162
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400163 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (gss_cred->gc_ctx)
165 ctx = gss_get_ctx(gss_cred->gc_ctx);
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400166 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return ctx;
168}
169
170static struct gss_cl_ctx *
171gss_alloc_context(void)
172{
173 struct gss_cl_ctx *ctx;
174
Trond Myklebust0f38b872008-06-10 18:31:01 -0400175 ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 if (ctx != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 ctx->gc_proc = RPC_GSS_PROC_DATA;
178 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
179 spin_lock_init(&ctx->gc_seq_lock);
180 atomic_set(&ctx->count,1);
181 }
182 return ctx;
183}
184
185#define GSSD_MIN_TIMEOUT (60 * 60)
186static const void *
187gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
188{
189 const void *q;
190 unsigned int seclen;
191 unsigned int timeout;
192 u32 window_size;
193 int ret;
194
195 /* First unsigned int gives the lifetime (in seconds) of the cred */
196 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
197 if (IS_ERR(p))
198 goto err;
199 if (timeout == 0)
200 timeout = GSSD_MIN_TIMEOUT;
201 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
202 /* Sequence number window. Determines the maximum number of simultaneous requests */
203 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
204 if (IS_ERR(p))
205 goto err;
206 ctx->gc_win = window_size;
207 /* gssd signals an error by passing ctx->gc_win = 0: */
208 if (ctx->gc_win == 0) {
209 /* in which case, p points to an error code which we ignore */
210 p = ERR_PTR(-EACCES);
211 goto err;
212 }
213 /* copy the opaque wire context */
214 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
215 if (IS_ERR(p))
216 goto err;
217 /* import the opaque security context */
218 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
219 if (IS_ERR(p))
220 goto err;
221 q = (const void *)((const char *)p + seclen);
222 if (unlikely(q > end || q < p)) {
223 p = ERR_PTR(-EFAULT);
224 goto err;
225 }
226 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
227 if (ret < 0) {
228 p = ERR_PTR(ret);
229 goto err;
230 }
231 return q;
232err:
Chuck Lever8885cb32007-01-31 12:14:05 -0500233 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return p;
235}
236
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500237#define UPCALL_BUF_LEN 128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239struct gss_upcall_msg {
240 atomic_t count;
241 uid_t uid;
242 struct rpc_pipe_msg msg;
243 struct list_head list;
244 struct gss_auth *auth;
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500245 struct rpc_inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 struct rpc_wait_queue rpc_waitqueue;
247 wait_queue_head_t waitqueue;
248 struct gss_cl_ctx *ctx;
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500249 char databuf[UPCALL_BUF_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250};
251
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500252static int get_pipe_version(void)
253{
254 int ret;
255
256 spin_lock(&pipe_version_lock);
257 if (pipe_version >= 0) {
258 atomic_inc(&pipe_users);
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500259 ret = pipe_version;
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500260 } else
261 ret = -EAGAIN;
262 spin_unlock(&pipe_version_lock);
263 return ret;
264}
265
266static void put_pipe_version(void)
267{
268 if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) {
269 pipe_version = -1;
270 spin_unlock(&pipe_version_lock);
271 }
272}
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274static void
275gss_release_msg(struct gss_upcall_msg *gss_msg)
276{
277 if (!atomic_dec_and_test(&gss_msg->count))
278 return;
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500279 put_pipe_version();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 BUG_ON(!list_empty(&gss_msg->list));
281 if (gss_msg->ctx != NULL)
282 gss_put_ctx(gss_msg->ctx);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500283 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 kfree(gss_msg);
285}
286
287static struct gss_upcall_msg *
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400288__gss_find_upcall(struct rpc_inode *rpci, uid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
290 struct gss_upcall_msg *pos;
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400291 list_for_each_entry(pos, &rpci->in_downcall, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 if (pos->uid != uid)
293 continue;
294 atomic_inc(&pos->count);
Chuck Lever8885cb32007-01-31 12:14:05 -0500295 dprintk("RPC: gss_find_upcall found msg %p\n", pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return pos;
297 }
Chuck Lever8885cb32007-01-31 12:14:05 -0500298 dprintk("RPC: gss_find_upcall found nothing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return NULL;
300}
301
\\\"J. Bruce Fields\\\720b8f22008-06-09 16:51:33 -0400302/* Try to add an upcall to the pipefs queue.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 * If an upcall owned by our uid already exists, then we return a reference
304 * to that upcall instead of adding the new upcall.
305 */
306static inline struct gss_upcall_msg *
307gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
308{
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500309 struct rpc_inode *rpci = gss_msg->inode;
310 struct inode *inode = &rpci->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 struct gss_upcall_msg *old;
312
Trond Myklebustb185f832007-06-07 10:14:14 -0400313 spin_lock(&inode->i_lock);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400314 old = __gss_find_upcall(rpci, gss_msg->uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 if (old == NULL) {
316 atomic_inc(&gss_msg->count);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400317 list_add(&gss_msg->list, &rpci->in_downcall);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 } else
319 gss_msg = old;
Trond Myklebustb185f832007-06-07 10:14:14 -0400320 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 return gss_msg;
322}
323
324static void
325__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
326{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 list_del_init(&gss_msg->list);
328 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
329 wake_up_all(&gss_msg->waitqueue);
330 atomic_dec(&gss_msg->count);
331}
332
333static void
334gss_unhash_msg(struct gss_upcall_msg *gss_msg)
335{
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500336 struct inode *inode = &gss_msg->inode->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400338 if (list_empty(&gss_msg->list))
339 return;
Trond Myklebustb185f832007-06-07 10:14:14 -0400340 spin_lock(&inode->i_lock);
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400341 if (!list_empty(&gss_msg->list))
342 __gss_unhash_msg(gss_msg);
Trond Myklebustb185f832007-06-07 10:14:14 -0400343 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
346static void
347gss_upcall_callback(struct rpc_task *task)
348{
349 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
350 struct gss_cred, gc_base);
351 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500352 struct inode *inode = &gss_msg->inode->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400354 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 if (gss_msg->ctx)
Trond Myklebust7b6962b2008-04-17 16:53:01 -0400356 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 else
358 task->tk_status = gss_msg->msg.errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 gss_cred->gc_upcall = NULL;
360 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
Trond Myklebustb185f832007-06-07 10:14:14 -0400361 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 gss_release_msg(gss_msg);
363}
364
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500365static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
366{
367 gss_msg->msg.data = &gss_msg->uid;
368 gss_msg->msg.len = sizeof(gss_msg->uid);
369}
370
Olga Kornievskaia8b1c7bf2008-12-23 16:19:26 -0500371static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
Olga Kornievskaia2efef702008-12-23 16:19:56 -0500372 struct rpc_clnt *clnt, int machine_cred)
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500373{
Olga Kornievskaia8b1c7bf2008-12-23 16:19:26 -0500374 char *p = gss_msg->databuf;
375 int len = 0;
376
377 gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ",
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500378 gss_msg->auth->mech->gm_name,
379 gss_msg->uid);
Olga Kornievskaia8b1c7bf2008-12-23 16:19:26 -0500380 p += gss_msg->msg.len;
381 if (clnt->cl_principal) {
382 len = sprintf(p, "target=%s ", clnt->cl_principal);
383 p += len;
384 gss_msg->msg.len += len;
385 }
Olga Kornievskaia2efef702008-12-23 16:19:56 -0500386 if (machine_cred) {
387 len = sprintf(p, "service=* ");
388 p += len;
389 gss_msg->msg.len += len;
390 } else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) {
391 len = sprintf(p, "service=nfs ");
392 p += len;
393 gss_msg->msg.len += len;
394 }
Olga Kornievskaia8b1c7bf2008-12-23 16:19:26 -0500395 len = sprintf(p, "\n");
396 gss_msg->msg.len += len;
397
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500398 gss_msg->msg.data = gss_msg->databuf;
399 BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN);
400}
401
Olga Kornievskaia8b1c7bf2008-12-23 16:19:26 -0500402static void gss_encode_msg(struct gss_upcall_msg *gss_msg,
Olga Kornievskaia2efef702008-12-23 16:19:56 -0500403 struct rpc_clnt *clnt, int machine_cred)
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500404{
405 if (pipe_version == 0)
406 gss_encode_v0_msg(gss_msg);
407 else /* pipe_version == 1 */
Olga Kornievskaia2efef702008-12-23 16:19:56 -0500408 gss_encode_v1_msg(gss_msg, clnt, machine_cred);
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500409}
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411static inline struct gss_upcall_msg *
Olga Kornievskaia2efef702008-12-23 16:19:56 -0500412gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt,
413 int machine_cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
415 struct gss_upcall_msg *gss_msg;
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500416 int vers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Trond Myklebust0f38b872008-06-10 18:31:01 -0400418 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
\"J. Bruce Fields\db75b3d2008-12-23 16:07:13 -0500419 if (gss_msg == NULL)
420 return ERR_PTR(-ENOMEM);
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500421 vers = get_pipe_version();
422 if (vers < 0) {
423 kfree(gss_msg);
424 return ERR_PTR(vers);
425 }
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500426 gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode);
\"J. Bruce Fields\db75b3d2008-12-23 16:07:13 -0500427 INIT_LIST_HEAD(&gss_msg->list);
428 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
429 init_waitqueue_head(&gss_msg->waitqueue);
430 atomic_set(&gss_msg->count, 1);
\"J. Bruce Fields\db75b3d2008-12-23 16:07:13 -0500431 gss_msg->uid = uid;
432 gss_msg->auth = gss_auth;
Olga Kornievskaia2efef702008-12-23 16:19:56 -0500433 gss_encode_msg(gss_msg, clnt, machine_cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 return gss_msg;
435}
436
437static struct gss_upcall_msg *
438gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
439{
Trond Myklebust7c67db32008-04-07 20:50:11 -0400440 struct gss_cred *gss_cred = container_of(cred,
441 struct gss_cred, gc_base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 struct gss_upcall_msg *gss_new, *gss_msg;
Trond Myklebust7c67db32008-04-07 20:50:11 -0400443 uid_t uid = cred->cr_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Olga Kornievskaia2efef702008-12-23 16:19:56 -0500445 gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred);
\"J. Bruce Fields\db75b3d2008-12-23 16:07:13 -0500446 if (IS_ERR(gss_new))
447 return gss_new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 gss_msg = gss_add_msg(gss_auth, gss_new);
449 if (gss_msg == gss_new) {
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500450 struct inode *inode = &gss_new->inode->vfs_inode;
451 int res = rpc_queue_upcall(inode, &gss_new->msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 if (res) {
453 gss_unhash_msg(gss_new);
454 gss_msg = ERR_PTR(res);
455 }
456 } else
457 gss_release_msg(gss_new);
458 return gss_msg;
459}
460
\"J. Bruce Fields\b03568c2008-12-23 16:06:55 -0500461static void warn_gssd(void)
462{
463 static unsigned long ratelimit;
464 unsigned long now = jiffies;
465
466 if (time_after(now, ratelimit)) {
467 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
468 "Please check user daemon is running.\n");
469 ratelimit = now + 15*HZ;
470 }
471}
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473static inline int
474gss_refresh_upcall(struct rpc_task *task)
475{
476 struct rpc_cred *cred = task->tk_msg.rpc_cred;
Trond Myklebust4a8c1342007-06-07 10:14:14 -0400477 struct gss_auth *gss_auth = container_of(cred->cr_auth,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 struct gss_auth, rpc_auth);
479 struct gss_cred *gss_cred = container_of(cred,
480 struct gss_cred, gc_base);
481 struct gss_upcall_msg *gss_msg;
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500482 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 int err = 0;
484
Chuck Lever8885cb32007-01-31 12:14:05 -0500485 dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid,
486 cred->cr_uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500488 if (IS_ERR(gss_msg) == -EAGAIN) {
489 /* XXX: warning on the first, under the assumption we
490 * shouldn't normally hit this case on a refresh. */
491 warn_gssd();
492 task->tk_timeout = 15*HZ;
493 rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
494 return 0;
495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (IS_ERR(gss_msg)) {
497 err = PTR_ERR(gss_msg);
498 goto out;
499 }
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500500 inode = &gss_msg->inode->vfs_inode;
Trond Myklebustb185f832007-06-07 10:14:14 -0400501 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 if (gss_cred->gc_upcall != NULL)
Trond Myklebust5d008372008-02-22 16:34:17 -0500503 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
Trond Myklebust7b6962b2008-04-17 16:53:01 -0400504 else if (gss_msg->ctx != NULL) {
505 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
506 gss_cred->gc_upcall = NULL;
507 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
508 } else if (gss_msg->msg.errno >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 task->tk_timeout = 0;
510 gss_cred->gc_upcall = gss_msg;
511 /* gss_upcall_callback will release the reference to gss_upcall_msg */
512 atomic_inc(&gss_msg->count);
Trond Myklebust5d008372008-02-22 16:34:17 -0500513 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 } else
515 err = gss_msg->msg.errno;
Trond Myklebustb185f832007-06-07 10:14:14 -0400516 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 gss_release_msg(gss_msg);
518out:
Chuck Lever8885cb32007-01-31 12:14:05 -0500519 dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n",
520 task->tk_pid, cred->cr_uid, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 return err;
522}
523
524static inline int
525gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
526{
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500527 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 struct rpc_cred *cred = &gss_cred->gc_base;
529 struct gss_upcall_msg *gss_msg;
530 DEFINE_WAIT(wait);
531 int err = 0;
532
Chuck Lever8885cb32007-01-31 12:14:05 -0500533 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid);
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500534retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500536 if (PTR_ERR(gss_msg) == -EAGAIN) {
537 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
538 pipe_version >= 0, 15*HZ);
539 if (err)
540 goto out;
541 if (pipe_version < 0)
542 warn_gssd();
543 goto retry;
544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 if (IS_ERR(gss_msg)) {
546 err = PTR_ERR(gss_msg);
547 goto out;
548 }
\"J. Bruce Fields\5b7ddd42008-12-23 16:15:44 -0500549 inode = &gss_msg->inode->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 for (;;) {
551 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
Trond Myklebustb185f832007-06-07 10:14:14 -0400552 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 break;
555 }
Trond Myklebustb185f832007-06-07 10:14:14 -0400556 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 if (signalled()) {
558 err = -ERESTARTSYS;
559 goto out_intr;
560 }
561 schedule();
562 }
563 if (gss_msg->ctx)
Trond Myklebust7b6962b2008-04-17 16:53:01 -0400564 gss_cred_set_ctx(cred, gss_msg->ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 else
566 err = gss_msg->msg.errno;
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400567 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568out_intr:
569 finish_wait(&gss_msg->waitqueue, &wait);
570 gss_release_msg(gss_msg);
571out:
Chuck Lever8885cb32007-01-31 12:14:05 -0500572 dprintk("RPC: gss_create_upcall for uid %u result %d\n",
573 cred->cr_uid, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 return err;
575}
576
577static ssize_t
578gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
579 char __user *dst, size_t buflen)
580{
581 char *data = (char *)msg->data + msg->copied;
Chuck Lever7df08992007-12-20 14:54:27 -0500582 size_t mlen = min(msg->len, buflen);
583 unsigned long left;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 left = copy_to_user(dst, data, mlen);
Chuck Lever7df08992007-12-20 14:54:27 -0500586 if (left == mlen) {
587 msg->errno = -EFAULT;
588 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 }
Chuck Lever7df08992007-12-20 14:54:27 -0500590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 mlen -= left;
592 msg->copied += mlen;
593 msg->errno = 0;
594 return mlen;
595}
596
597#define MSG_BUF_MAXSIZE 1024
598
599static ssize_t
600gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
601{
602 const void *p, *end;
603 void *buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 struct gss_upcall_msg *gss_msg;
Trond Myklebustb185f832007-06-07 10:14:14 -0400605 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 struct gss_cl_ctx *ctx;
607 uid_t uid;
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400608 ssize_t err = -EFBIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 if (mlen > MSG_BUF_MAXSIZE)
611 goto out;
612 err = -ENOMEM;
Trond Myklebust0f38b872008-06-10 18:31:01 -0400613 buf = kmalloc(mlen, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 if (!buf)
615 goto out;
616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 err = -EFAULT;
618 if (copy_from_user(buf, src, mlen))
619 goto err;
620
621 end = (const void *)((char *)buf + mlen);
622 p = simple_get_bytes(buf, end, &uid, sizeof(uid));
623 if (IS_ERR(p)) {
624 err = PTR_ERR(p);
625 goto err;
626 }
627
628 err = -ENOMEM;
629 ctx = gss_alloc_context();
630 if (ctx == NULL)
631 goto err;
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400632
633 err = -ENOENT;
634 /* Find a matching upcall */
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400635 spin_lock(&inode->i_lock);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400636 gss_msg = __gss_find_upcall(RPC_I(inode), uid);
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400637 if (gss_msg == NULL) {
638 spin_unlock(&inode->i_lock);
639 goto err_put_ctx;
640 }
641 list_del_init(&gss_msg->list);
642 spin_unlock(&inode->i_lock);
643
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400644 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if (IS_ERR(p)) {
646 err = PTR_ERR(p);
Kevin Coffmanffc40f52007-11-09 18:42:04 -0500647 gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES;
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400648 goto err_release_msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 }
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400650 gss_msg->ctx = gss_get_ctx(ctx);
651 err = mlen;
652
653err_release_msg:
Trond Myklebustb185f832007-06-07 10:14:14 -0400654 spin_lock(&inode->i_lock);
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400655 __gss_unhash_msg(gss_msg);
656 spin_unlock(&inode->i_lock);
657 gss_release_msg(gss_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658err_put_ctx:
659 gss_put_ctx(ctx);
660err:
661 kfree(buf);
662out:
Trond Myklebust3b68aae2007-06-07 10:14:15 -0400663 dprintk("RPC: gss_pipe_downcall returning %Zd\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 return err;
665}
666
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500667static int gss_pipe_open(struct inode *inode, int new_version)
\"J. Bruce Fields\cf819392008-12-23 16:10:19 -0500668{
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500669 int ret = 0;
670
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500671 spin_lock(&pipe_version_lock);
672 if (pipe_version < 0) {
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500673 /* First open of any gss pipe determines the version: */
674 pipe_version = new_version;
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500675 rpc_wake_up(&pipe_version_rpc_waitqueue);
676 wake_up(&pipe_version_waitqueue);
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500677 } else if (pipe_version != new_version) {
678 /* Trying to open a pipe of a different version */
679 ret = -EBUSY;
680 goto out;
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500681 }
\"J. Bruce Fields\cf819392008-12-23 16:10:19 -0500682 atomic_inc(&pipe_users);
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500683out:
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500684 spin_unlock(&pipe_version_lock);
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500685 return ret;
686
687}
688
689static int gss_pipe_open_v0(struct inode *inode)
690{
691 return gss_pipe_open(inode, 0);
692}
693
694static int gss_pipe_open_v1(struct inode *inode)
695{
696 return gss_pipe_open(inode, 1);
\"J. Bruce Fields\cf819392008-12-23 16:10:19 -0500697}
698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699static void
700gss_pipe_release(struct inode *inode)
701{
702 struct rpc_inode *rpci = RPC_I(inode);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400703 struct gss_upcall_msg *gss_msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Trond Myklebustb185f832007-06-07 10:14:14 -0400705 spin_lock(&inode->i_lock);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400706 while (!list_empty(&rpci->in_downcall)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400708 gss_msg = list_entry(rpci->in_downcall.next,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 struct gss_upcall_msg, list);
710 gss_msg->msg.errno = -EPIPE;
711 atomic_inc(&gss_msg->count);
712 __gss_unhash_msg(gss_msg);
Trond Myklebustb185f832007-06-07 10:14:14 -0400713 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 gss_release_msg(gss_msg);
Trond Myklebustb185f832007-06-07 10:14:14 -0400715 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 }
Trond Myklebustb185f832007-06-07 10:14:14 -0400717 spin_unlock(&inode->i_lock);
\"J. Bruce Fields\cf819392008-12-23 16:10:19 -0500718
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -0500719 put_pipe_version();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720}
721
722static void
723gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
724{
725 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
727 if (msg->errno < 0) {
Chuck Lever8885cb32007-01-31 12:14:05 -0500728 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 gss_msg);
730 atomic_inc(&gss_msg->count);
731 gss_unhash_msg(gss_msg);
\"J. Bruce Fields\b03568c2008-12-23 16:06:55 -0500732 if (msg->errno == -ETIMEDOUT)
733 warn_gssd();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 gss_release_msg(gss_msg);
735 }
736}
737
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800738/*
739 * NOTE: we have the opportunity to use different
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 * parameters based on the input flavor (which must be a pseudoflavor)
741 */
742static struct rpc_auth *
743gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
744{
745 struct gss_auth *gss_auth;
746 struct rpc_auth * auth;
J. Bruce Fields6a192752005-06-22 17:16:23 +0000747 int err = -ENOMEM; /* XXX? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Chuck Lever8885cb32007-01-31 12:14:05 -0500749 dprintk("RPC: creating GSS authenticator for client %p\n", clnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
751 if (!try_module_get(THIS_MODULE))
J. Bruce Fields6a192752005-06-22 17:16:23 +0000752 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
754 goto out_dec;
755 gss_auth->client = clnt;
J. Bruce Fields6a192752005-06-22 17:16:23 +0000756 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
758 if (!gss_auth->mech) {
James Morris3392c342007-12-26 11:20:43 +1100759 printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800760 __func__, flavor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 goto err_free;
762 }
763 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
J. Bruce Fields438b6fd2005-06-22 17:16:23 +0000764 if (gss_auth->service == 0)
765 goto err_put_mech;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 auth = &gss_auth->rpc_auth;
767 auth->au_cslack = GSS_CRED_SLACK >> 2;
768 auth->au_rslack = GSS_VERF_SLACK >> 2;
769 auth->au_ops = &authgss_ops;
770 auth->au_flavor = flavor;
771 atomic_set(&auth->au_count, 1);
Trond Myklebust0285ed12007-06-27 14:29:12 -0400772 kref_init(&gss_auth->kref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500774 /*
775 * Note: if we created the old pipe first, then someone who
776 * examined the directory at the right moment might conclude
777 * that we supported only the old pipe. So we instead create
778 * the new pipe first.
779 */
Trond Myklebust7d217ca2009-08-09 15:14:24 -0400780 gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry,
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500781 "gssd",
782 clnt, &gss_upcall_ops_v1,
783 RPC_PIPE_WAIT_FOR_OPEN);
784 if (IS_ERR(gss_auth->dentry[1])) {
785 err = PTR_ERR(gss_auth->dentry[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 goto err_put_mech;
J. Bruce Fields6a192752005-06-22 17:16:23 +0000787 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Trond Myklebust7d217ca2009-08-09 15:14:24 -0400789 gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry,
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500790 gss_auth->mech->gm_name,
791 clnt, &gss_upcall_ops_v0,
792 RPC_PIPE_WAIT_FOR_OPEN);
793 if (IS_ERR(gss_auth->dentry[0])) {
794 err = PTR_ERR(gss_auth->dentry[0]);
795 goto err_unlink_pipe_1;
796 }
Trond Myklebustf5c21872007-06-25 17:11:20 -0400797 err = rpcauth_init_credcache(auth);
Trond Myklebust07a2bf12007-06-09 15:42:01 -0400798 if (err)
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500799 goto err_unlink_pipe_0;
Trond Myklebust07a2bf12007-06-09 15:42:01 -0400800
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 return auth;
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500802err_unlink_pipe_0:
803 rpc_unlink(gss_auth->dentry[0]);
804err_unlink_pipe_1:
805 rpc_unlink(gss_auth->dentry[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806err_put_mech:
807 gss_mech_put(gss_auth->mech);
808err_free:
809 kfree(gss_auth);
810out_dec:
811 module_put(THIS_MODULE);
J. Bruce Fields6a192752005-06-22 17:16:23 +0000812 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813}
814
815static void
Trond Myklebust0285ed12007-06-27 14:29:12 -0400816gss_free(struct gss_auth *gss_auth)
817{
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -0500818 rpc_unlink(gss_auth->dentry[1]);
819 rpc_unlink(gss_auth->dentry[0]);
Trond Myklebust0285ed12007-06-27 14:29:12 -0400820 gss_mech_put(gss_auth->mech);
821
822 kfree(gss_auth);
823 module_put(THIS_MODULE);
824}
825
826static void
827gss_free_callback(struct kref *kref)
828{
829 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
830
831 gss_free(gss_auth);
832}
833
834static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835gss_destroy(struct rpc_auth *auth)
836{
837 struct gss_auth *gss_auth;
838
Chuck Lever8885cb32007-01-31 12:14:05 -0500839 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
840 auth, auth->au_flavor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Trond Myklebust3ab9bb72007-06-09 15:41:42 -0400842 rpcauth_destroy_credcache(auth);
843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
Trond Myklebust0285ed12007-06-27 14:29:12 -0400845 kref_put(&gss_auth->kref, gss_free_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846}
847
Trond Myklebust0df7fb72007-06-26 17:04:57 -0400848/*
849 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
850 * to the server with the GSS control procedure field set to
851 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
852 * all RPCSEC_GSS state associated with that context.
853 */
854static int
855gss_destroying_context(struct rpc_cred *cred)
856{
857 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
858 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
859 struct rpc_task *task;
860
861 if (gss_cred->gc_ctx == NULL ||
Jeff Layton6dcd3922008-12-23 15:21:57 -0500862 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
Trond Myklebust0df7fb72007-06-26 17:04:57 -0400863 return 0;
864
865 gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
866 cred->cr_ops = &gss_nullops;
867
868 /* Take a reference to ensure the cred will be destroyed either
869 * by the RPC call or by the put_rpccred() below */
870 get_rpccred(cred);
871
Trond Myklebust080a1f12008-04-19 14:22:31 -0400872 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
Trond Myklebust0df7fb72007-06-26 17:04:57 -0400873 if (!IS_ERR(task))
874 rpc_put_task(task);
875
876 put_rpccred(cred);
877 return 1;
878}
879
880/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 * to create a new cred or context, so they check that things have been
882 * allocated before freeing them. */
883static void
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400884gss_do_free_ctx(struct gss_cl_ctx *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400886 dprintk("RPC: gss_free_ctx\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 kfree(ctx->gc_wire_ctx.data);
889 kfree(ctx);
890}
891
892static void
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400893gss_free_ctx_callback(struct rcu_head *head)
894{
895 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
896 gss_do_free_ctx(ctx);
897}
898
899static void
900gss_free_ctx(struct gss_cl_ctx *ctx)
901{
Trond Myklebusta4deb812007-08-06 12:21:13 -0400902 struct gss_ctx *gc_gss_ctx;
903
904 gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx);
905 rcu_assign_pointer(ctx->gc_gss_ctx, NULL);
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400906 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
Trond Myklebusta4deb812007-08-06 12:21:13 -0400907 if (gc_gss_ctx)
908 gss_delete_sec_context(&gc_gss_ctx);
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400909}
910
911static void
Trond Myklebust31be5bf2007-06-24 15:55:26 -0400912gss_free_cred(struct gss_cred *gss_cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913{
Trond Myklebust31be5bf2007-06-24 15:55:26 -0400914 dprintk("RPC: gss_free_cred %p\n", gss_cred);
Trond Myklebust31be5bf2007-06-24 15:55:26 -0400915 kfree(gss_cred);
916}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Trond Myklebust31be5bf2007-06-24 15:55:26 -0400918static void
919gss_free_cred_callback(struct rcu_head *head)
920{
921 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
922 gss_free_cred(gss_cred);
923}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Trond Myklebust31be5bf2007-06-24 15:55:26 -0400925static void
Jeff Layton6dcd3922008-12-23 15:21:57 -0500926gss_destroy_nullcred(struct rpc_cred *cred)
Trond Myklebust31be5bf2007-06-24 15:55:26 -0400927{
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400928 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
Trond Myklebust0285ed12007-06-27 14:29:12 -0400929 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400930 struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
931
932 rcu_assign_pointer(gss_cred->gc_ctx, NULL);
Trond Myklebust31be5bf2007-06-24 15:55:26 -0400933 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
Trond Myklebust5d28dc82007-06-26 19:18:38 -0400934 if (ctx)
935 gss_put_ctx(ctx);
Trond Myklebust0285ed12007-06-27 14:29:12 -0400936 kref_put(&gss_auth->kref, gss_free_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937}
938
Jeff Layton6dcd3922008-12-23 15:21:57 -0500939static void
940gss_destroy_cred(struct rpc_cred *cred)
941{
942
943 if (gss_destroying_context(cred))
944 return;
945 gss_destroy_nullcred(cred);
946}
947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948/*
949 * Lookup RPCSEC_GSS cred for the current process
950 */
951static struct rpc_cred *
Trond Myklebust8a317762006-02-01 12:18:36 -0500952gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953{
Trond Myklebust8a317762006-02-01 12:18:36 -0500954 return rpcauth_lookup_credcache(auth, acred, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955}
956
957static struct rpc_cred *
Trond Myklebust8a317762006-02-01 12:18:36 -0500958gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959{
960 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
961 struct gss_cred *cred = NULL;
962 int err = -ENOMEM;
963
Chuck Lever8885cb32007-01-31 12:14:05 -0500964 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 acred->uid, auth->au_flavor);
966
Trond Myklebust0f38b872008-06-10 18:31:01 -0400967 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 goto out_err;
969
Trond Myklebust5fe47552007-06-23 19:55:31 -0400970 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 /*
972 * Note: in order to force a call to call_refresh(), we deliberately
973 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
974 */
Trond Myklebustfc432dd2007-06-25 10:15:15 -0400975 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 cred->gc_service = gss_auth->service;
Trond Myklebust7c67db32008-04-07 20:50:11 -0400977 cred->gc_machine_cred = acred->machine_cred;
Trond Myklebust0285ed12007-06-27 14:29:12 -0400978 kref_get(&gss_auth->kref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 return &cred->gc_base;
980
981out_err:
Chuck Lever8885cb32007-01-31 12:14:05 -0500982 dprintk("RPC: gss_create_cred failed with error %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 return ERR_PTR(err);
984}
985
986static int
Trond Myklebustfba3bad2006-02-01 12:19:27 -0500987gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
988{
989 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
990 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
991 int err;
992
993 do {
994 err = gss_create_upcall(gss_auth, gss_cred);
995 } while (err == -EAGAIN);
996 return err;
997}
998
999static int
Trond Myklebust8a317762006-02-01 12:18:36 -05001000gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
1002 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1003
Trond Myklebustcd019f72008-04-17 17:03:58 -04001004 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
Trond Myklebust8a317762006-02-01 12:18:36 -05001005 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 /* Don't match with creds that have expired. */
Trond Myklebustcd019f72008-04-17 17:03:58 -04001007 if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
1008 return 0;
1009 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 return 0;
Trond Myklebust8a317762006-02-01 12:18:36 -05001011out:
Trond Myklebust7c67db32008-04-07 20:50:11 -04001012 if (acred->machine_cred != gss_cred->gc_machine_cred)
1013 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 return (rc->cr_uid == acred->uid);
1015}
1016
1017/*
1018* Marshal credentials.
1019* Maybe we should keep a cached credential for performance reasons.
1020*/
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001021static __be32 *
1022gss_marshal(struct rpc_task *task, __be32 *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023{
1024 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1025 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1026 gc_base);
1027 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001028 __be32 *cred_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 struct rpc_rqst *req = task->tk_rqstp;
1030 u32 maj_stat = 0;
1031 struct xdr_netobj mic;
1032 struct kvec iov;
1033 struct xdr_buf verf_buf;
1034
Chuck Lever8885cb32007-01-31 12:14:05 -05001035 dprintk("RPC: %5u gss_marshal\n", task->tk_pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
1037 *p++ = htonl(RPC_AUTH_GSS);
1038 cred_len = p++;
1039
1040 spin_lock(&ctx->gc_seq_lock);
1041 req->rq_seqno = ctx->gc_seq++;
1042 spin_unlock(&ctx->gc_seq_lock);
1043
1044 *p++ = htonl((u32) RPC_GSS_VERSION);
1045 *p++ = htonl((u32) ctx->gc_proc);
1046 *p++ = htonl((u32) req->rq_seqno);
1047 *p++ = htonl((u32) gss_cred->gc_service);
1048 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1049 *cred_len = htonl((p - (cred_len + 1)) << 2);
1050
1051 /* We compute the checksum for the verifier over the xdr-encoded bytes
1052 * starting with the xid and ending at the end of the credential: */
Chuck Lever808012f2005-08-25 16:25:49 -07001053 iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
1054 req->rq_snd_buf.head[0].iov_base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1056 xdr_buf_from_iov(&iov, &verf_buf);
1057
1058 /* set verifier flavor*/
1059 *p++ = htonl(RPC_AUTH_GSS);
1060
1061 mic.data = (u8 *)(p + 1);
J. Bruce Fields00fd6e12005-10-13 16:55:18 -04001062 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
Trond Myklebustfc432dd2007-06-25 10:15:15 -04001064 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 } else if (maj_stat != 0) {
1066 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1067 goto out_put_ctx;
1068 }
1069 p = xdr_encode_opaque(p, NULL, mic.len);
1070 gss_put_ctx(ctx);
1071 return p;
1072out_put_ctx:
1073 gss_put_ctx(ctx);
1074 return NULL;
1075}
1076
Trond Myklebustcd019f72008-04-17 17:03:58 -04001077static int gss_renew_cred(struct rpc_task *task)
1078{
1079 struct rpc_cred *oldcred = task->tk_msg.rpc_cred;
1080 struct gss_cred *gss_cred = container_of(oldcred,
1081 struct gss_cred,
1082 gc_base);
1083 struct rpc_auth *auth = oldcred->cr_auth;
1084 struct auth_cred acred = {
1085 .uid = oldcred->cr_uid,
1086 .machine_cred = gss_cred->gc_machine_cred,
1087 };
1088 struct rpc_cred *new;
1089
1090 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1091 if (IS_ERR(new))
1092 return PTR_ERR(new);
1093 task->tk_msg.rpc_cred = new;
1094 put_rpccred(oldcred);
1095 return 0;
1096}
1097
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098/*
1099* Refresh credentials. XXX - finish
1100*/
1101static int
1102gss_refresh(struct rpc_task *task)
1103{
Trond Myklebustcd019f72008-04-17 17:03:58 -04001104 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1105 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106
Trond Myklebustcd019f72008-04-17 17:03:58 -04001107 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1108 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1109 ret = gss_renew_cred(task);
1110 if (ret < 0)
1111 goto out;
1112 cred = task->tk_msg.rpc_cred;
1113 }
1114
1115 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1116 ret = gss_refresh_upcall(task);
1117out:
1118 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119}
1120
Trond Myklebust0df7fb72007-06-26 17:04:57 -04001121/* Dummy refresh routine: used only when destroying the context */
1122static int
1123gss_refresh_null(struct rpc_task *task)
1124{
1125 return -EACCES;
1126}
1127
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001128static __be32 *
1129gss_validate(struct rpc_task *task, __be32 *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130{
1131 struct rpc_cred *cred = task->tk_msg.rpc_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001133 __be32 seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 struct kvec iov;
1135 struct xdr_buf verf_buf;
1136 struct xdr_netobj mic;
1137 u32 flav,len;
1138 u32 maj_stat;
1139
Chuck Lever8885cb32007-01-31 12:14:05 -05001140 dprintk("RPC: %5u gss_validate\n", task->tk_pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
1142 flav = ntohl(*p++);
1143 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001144 goto out_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 if (flav != RPC_AUTH_GSS)
1146 goto out_bad;
1147 seq = htonl(task->tk_rqstp->rq_seqno);
1148 iov.iov_base = &seq;
1149 iov.iov_len = sizeof(seq);
1150 xdr_buf_from_iov(&iov, &verf_buf);
1151 mic.data = (u8 *)p;
1152 mic.len = len;
1153
J. Bruce Fields00fd6e12005-10-13 16:55:18 -04001154 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
Trond Myklebustfc432dd2007-06-25 10:15:15 -04001156 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
Trond Myklebust0df7fb72007-06-26 17:04:57 -04001157 if (maj_stat) {
Joe Perches014313a2007-11-19 17:53:43 -08001158 dprintk("RPC: %5u gss_validate: gss_verify_mic returned "
Trond Myklebust0df7fb72007-06-26 17:04:57 -04001159 "error 0x%08x\n", task->tk_pid, maj_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 goto out_bad;
Trond Myklebust0df7fb72007-06-26 17:04:57 -04001161 }
J. Bruce Fields24b26052005-10-13 16:54:53 -04001162 /* We leave it to unwrap to calculate au_rslack. For now we just
1163 * calculate the length of the verifier: */
Trond Myklebust1be27f32007-06-27 14:29:04 -04001164 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 gss_put_ctx(ctx);
Chuck Lever8885cb32007-01-31 12:14:05 -05001166 dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 task->tk_pid);
1168 return p + XDR_QUADLEN(len);
1169out_bad:
1170 gss_put_ctx(ctx);
Chuck Lever8885cb32007-01-31 12:14:05 -05001171 dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 return NULL;
1173}
1174
1175static inline int
1176gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001177 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178{
1179 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1180 struct xdr_buf integ_buf;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001181 __be32 *integ_len = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 struct xdr_netobj mic;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001183 u32 offset;
1184 __be32 *q;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 struct kvec *iov;
1186 u32 maj_stat = 0;
1187 int status = -EIO;
1188
1189 integ_len = p++;
1190 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1191 *p++ = htonl(rqstp->rq_seqno);
1192
Trond Myklebust88a9fe82008-12-23 15:21:31 -05001193 status = encode(rqstp, p, obj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 if (status)
1195 return status;
1196
1197 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1198 offset, snd_buf->len - offset))
1199 return status;
1200 *integ_len = htonl(integ_buf.len);
1201
1202 /* guess whether we're in the head or the tail: */
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001203 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 iov = snd_buf->tail;
1205 else
1206 iov = snd_buf->head;
1207 p = iov->iov_base + iov->iov_len;
1208 mic.data = (u8 *)(p + 1);
1209
J. Bruce Fields00fd6e12005-10-13 16:55:18 -04001210 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 status = -EIO; /* XXX? */
1212 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
Trond Myklebustfc432dd2007-06-25 10:15:15 -04001213 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 else if (maj_stat)
1215 return status;
1216 q = xdr_encode_opaque(p, NULL, mic.len);
1217
1218 offset = (u8 *)q - (u8 *)p;
1219 iov->iov_len += offset;
1220 snd_buf->len += offset;
1221 return 0;
1222}
1223
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001224static void
1225priv_release_snd_buf(struct rpc_rqst *rqstp)
1226{
1227 int i;
1228
1229 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1230 __free_page(rqstp->rq_enc_pages[i]);
1231 kfree(rqstp->rq_enc_pages);
1232}
1233
1234static int
1235alloc_enc_pages(struct rpc_rqst *rqstp)
1236{
1237 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1238 int first, last, i;
1239
1240 if (snd_buf->page_len == 0) {
1241 rqstp->rq_enc_pages_num = 0;
1242 return 0;
1243 }
1244
1245 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1246 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
1247 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1248 rqstp->rq_enc_pages
1249 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1250 GFP_NOFS);
1251 if (!rqstp->rq_enc_pages)
1252 goto out;
1253 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1254 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1255 if (rqstp->rq_enc_pages[i] == NULL)
1256 goto out_free;
1257 }
1258 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1259 return 0;
1260out_free:
1261 for (i--; i >= 0; i--) {
1262 __free_page(rqstp->rq_enc_pages[i]);
1263 }
1264out:
1265 return -EAGAIN;
1266}
1267
1268static inline int
1269gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001270 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001271{
1272 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1273 u32 offset;
1274 u32 maj_stat;
1275 int status;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001276 __be32 *opaque_len;
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001277 struct page **inpages;
1278 int first;
1279 int pad;
1280 struct kvec *iov;
1281 char *tmp;
1282
1283 opaque_len = p++;
1284 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1285 *p++ = htonl(rqstp->rq_seqno);
1286
Trond Myklebust88a9fe82008-12-23 15:21:31 -05001287 status = encode(rqstp, p, obj);
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001288 if (status)
1289 return status;
1290
1291 status = alloc_enc_pages(rqstp);
1292 if (status)
1293 return status;
1294 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1295 inpages = snd_buf->pages + first;
1296 snd_buf->pages = rqstp->rq_enc_pages;
1297 snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1298 /* Give the tail its own page, in case we need extra space in the
1299 * head when wrapping: */
1300 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1301 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1302 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1303 snd_buf->tail[0].iov_base = tmp;
1304 }
J. Bruce Fields00fd6e12005-10-13 16:55:18 -04001305 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001306 /* RPC_SLACK_SPACE should prevent this ever happening: */
1307 BUG_ON(snd_buf->len > snd_buf->buflen);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001308 status = -EIO;
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001309 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1310 * done anyway, so it's safe to put the request on the wire: */
1311 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
Trond Myklebustfc432dd2007-06-25 10:15:15 -04001312 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001313 else if (maj_stat)
1314 return status;
1315
1316 *opaque_len = htonl(snd_buf->len - offset);
1317 /* guess whether we're in the head or the tail: */
1318 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1319 iov = snd_buf->tail;
1320 else
1321 iov = snd_buf->head;
1322 p = iov->iov_base + iov->iov_len;
1323 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1324 memset(p, 0, pad);
1325 iov->iov_len += pad;
1326 snd_buf->len += pad;
1327
1328 return 0;
1329}
1330
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331static int
1332gss_wrap_req(struct rpc_task *task,
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001333 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334{
1335 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1336 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1337 gc_base);
1338 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1339 int status = -EIO;
1340
Chuck Lever8885cb32007-01-31 12:14:05 -05001341 dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1343 /* The spec seems a little ambiguous here, but I think that not
1344 * wrapping context destruction requests makes the most sense.
1345 */
Trond Myklebust88a9fe82008-12-23 15:21:31 -05001346 status = encode(rqstp, p, obj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 goto out;
1348 }
1349 switch (gss_cred->gc_service) {
1350 case RPC_GSS_SVC_NONE:
Trond Myklebust88a9fe82008-12-23 15:21:31 -05001351 status = encode(rqstp, p, obj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 break;
1353 case RPC_GSS_SVC_INTEGRITY:
1354 status = gss_wrap_req_integ(cred, ctx, encode,
1355 rqstp, p, obj);
1356 break;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001357 case RPC_GSS_SVC_PRIVACY:
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001358 status = gss_wrap_req_priv(cred, ctx, encode,
1359 rqstp, p, obj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 break;
1361 }
1362out:
1363 gss_put_ctx(ctx);
Chuck Lever8885cb32007-01-31 12:14:05 -05001364 dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 return status;
1366}
1367
1368static inline int
1369gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001370 struct rpc_rqst *rqstp, __be32 **p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371{
1372 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1373 struct xdr_buf integ_buf;
1374 struct xdr_netobj mic;
1375 u32 data_offset, mic_offset;
1376 u32 integ_len;
1377 u32 maj_stat;
1378 int status = -EIO;
1379
1380 integ_len = ntohl(*(*p)++);
1381 if (integ_len & 3)
1382 return status;
1383 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1384 mic_offset = integ_len + data_offset;
1385 if (mic_offset > rcv_buf->len)
1386 return status;
1387 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1388 return status;
1389
1390 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1391 mic_offset - data_offset))
1392 return status;
1393
1394 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1395 return status;
1396
J. Bruce Fields00fd6e12005-10-13 16:55:18 -04001397 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
Trond Myklebustfc432dd2007-06-25 10:15:15 -04001399 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 if (maj_stat != GSS_S_COMPLETE)
1401 return status;
1402 return 0;
1403}
1404
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001405static inline int
1406gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001407 struct rpc_rqst *rqstp, __be32 **p)
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001408{
1409 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1410 u32 offset;
1411 u32 opaque_len;
1412 u32 maj_stat;
1413 int status = -EIO;
1414
1415 opaque_len = ntohl(*(*p)++);
1416 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1417 if (offset + opaque_len > rcv_buf->len)
1418 return status;
1419 /* remove padding: */
1420 rcv_buf->len = offset + opaque_len;
1421
J. Bruce Fields00fd6e12005-10-13 16:55:18 -04001422 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001423 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
Trond Myklebustfc432dd2007-06-25 10:15:15 -04001424 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001425 if (maj_stat != GSS_S_COMPLETE)
1426 return status;
1427 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1428 return status;
1429
1430 return 0;
1431}
1432
1433
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434static int
1435gss_unwrap_resp(struct rpc_task *task,
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001436 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437{
1438 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1439 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1440 gc_base);
1441 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001442 __be32 *savedp = p;
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001443 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1444 int savedlen = head->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 int status = -EIO;
1446
1447 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1448 goto out_decode;
1449 switch (gss_cred->gc_service) {
1450 case RPC_GSS_SVC_NONE:
1451 break;
1452 case RPC_GSS_SVC_INTEGRITY:
1453 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1454 if (status)
1455 goto out;
1456 break;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001457 case RPC_GSS_SVC_PRIVACY:
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001458 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1459 if (status)
1460 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 break;
1462 }
J. Bruce Fields24b26052005-10-13 16:54:53 -04001463 /* take into account extra slack for integrity and privacy cases: */
Trond Myklebust1be27f32007-06-27 14:29:04 -04001464 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
J. Bruce Fields2d2da60c2005-10-13 16:54:58 -04001465 + (savedlen - head->iov_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466out_decode:
Trond Myklebust88a9fe82008-12-23 15:21:31 -05001467 status = decode(rqstp, p, obj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468out:
1469 gss_put_ctx(ctx);
Chuck Lever8885cb32007-01-31 12:14:05 -05001470 dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 status);
1472 return status;
1473}
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001474
Trond Myklebustf1c0a862007-06-23 20:17:58 -04001475static const struct rpc_authops authgss_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 .owner = THIS_MODULE,
1477 .au_flavor = RPC_AUTH_GSS,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 .au_name = "RPCSEC_GSS",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 .create = gss_create,
1480 .destroy = gss_destroy,
1481 .lookup_cred = gss_lookup_cred,
1482 .crcreate = gss_create_cred
1483};
1484
Trond Myklebustf1c0a862007-06-23 20:17:58 -04001485static const struct rpc_credops gss_credops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 .cr_name = "AUTH_GSS",
1487 .crdestroy = gss_destroy_cred,
Trond Myklebustfba3bad2006-02-01 12:19:27 -05001488 .cr_init = gss_cred_init,
Trond Myklebust5c691042008-03-12 16:21:07 -04001489 .crbind = rpcauth_generic_bind_cred,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 .crmatch = gss_match,
1491 .crmarshal = gss_marshal,
1492 .crrefresh = gss_refresh,
1493 .crvalidate = gss_validate,
1494 .crwrap_req = gss_wrap_req,
1495 .crunwrap_resp = gss_unwrap_resp,
1496};
1497
Trond Myklebust0df7fb72007-06-26 17:04:57 -04001498static const struct rpc_credops gss_nullops = {
1499 .cr_name = "AUTH_GSS",
Jeff Layton6dcd3922008-12-23 15:21:57 -05001500 .crdestroy = gss_destroy_nullcred,
Trond Myklebust5c691042008-03-12 16:21:07 -04001501 .crbind = rpcauth_generic_bind_cred,
Trond Myklebust0df7fb72007-06-26 17:04:57 -04001502 .crmatch = gss_match,
1503 .crmarshal = gss_marshal,
1504 .crrefresh = gss_refresh_null,
1505 .crvalidate = gss_validate,
1506 .crwrap_req = gss_wrap_req,
1507 .crunwrap_resp = gss_unwrap_resp,
1508};
1509
Trond Myklebustb693ba42009-08-09 15:14:15 -04001510static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 .upcall = gss_pipe_upcall,
1512 .downcall = gss_pipe_downcall,
1513 .destroy_msg = gss_pipe_destroy_msg,
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -05001514 .open_pipe = gss_pipe_open_v0,
1515 .release_pipe = gss_pipe_release,
1516};
1517
Trond Myklebustb693ba42009-08-09 15:14:15 -04001518static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
\"J. Bruce Fields\34769fc2008-12-23 16:16:37 -05001519 .upcall = gss_pipe_upcall,
1520 .downcall = gss_pipe_downcall,
1521 .destroy_msg = gss_pipe_destroy_msg,
1522 .open_pipe = gss_pipe_open_v1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 .release_pipe = gss_pipe_release,
1524};
1525
1526/*
1527 * Initialize RPCSEC_GSS module
1528 */
1529static int __init init_rpcsec_gss(void)
1530{
1531 int err = 0;
1532
1533 err = rpcauth_register(&authgss_ops);
1534 if (err)
1535 goto out;
1536 err = gss_svc_init();
1537 if (err)
1538 goto out_unregister;
\"J. Bruce Fields\79a3f202008-12-23 16:10:52 -05001539 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 return 0;
1541out_unregister:
1542 rpcauth_unregister(&authgss_ops);
1543out:
1544 return err;
1545}
1546
1547static void __exit exit_rpcsec_gss(void)
1548{
1549 gss_svc_shutdown();
1550 rpcauth_unregister(&authgss_ops);
Jesper Dangaard Brouerbf126912009-06-08 03:11:48 +00001551 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552}
1553
1554MODULE_LICENSE("GPL");
1555module_init(init_rpcsec_gss)
1556module_exit(exit_rpcsec_gss)