blob: 54ae5be62f6a5d878878ffb396870a76ebff2d7a [file] [log] [blame]
Chuck Lever2573a462019-02-11 11:25:15 -05001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * Neil Brown <neilb@cse.unsw.edu.au>
4 * J. Bruce Fields <bfields@umich.edu>
5 * Andy Adamson <andros@umich.edu>
6 * Dug Song <dugsong@monkey.org>
7 *
8 * RPCSEC_GSS server authentication.
9 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
10 * (gssapi)
11 *
12 * The RPCSEC_GSS involves three stages:
13 * 1/ context creation
14 * 2/ data exchange
15 * 3/ context destruction
16 *
17 * Context creation is handled largely by upcalls to user-space.
18 * In particular, GSS_Accept_sec_context is handled by an upcall
19 * Data exchange is handled entirely within the kernel
20 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
21 * Context destruction is handled in-kernel
22 * GSS_Delete_sec_context is in-kernel
23 *
24 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
25 * The context handle and gss_token are used as a key into the rpcsec_init cache.
26 * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
27 * being major_status, minor_status, context_handle, reply_token.
28 * These are sent back to the client.
29 * Sequence window management is handled by the kernel. The window size if currently
30 * a compile time constant.
31 *
32 * When user-space is happy that a context is established, it places an entry
33 * in the rpcsec_context cache. The key for this cache is the context_handle.
34 * The content includes:
35 * uid/gidlist - for determining access rights
36 * mechanism type
37 * mechanism specific information, such as a key
38 *
39 */
40
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/types.h>
43#include <linux/module.h>
44#include <linux/pagemap.h>
Eric W. Biedermanae2975b2011-11-14 15:56:38 -080045#include <linux/user_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47#include <linux/sunrpc/auth_gss.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/sunrpc/gss_err.h>
49#include <linux/sunrpc/svcauth.h>
50#include <linux/sunrpc/svcauth_gss.h>
51#include <linux/sunrpc/cache.h>
Chuck Leverff27e9f2019-10-24 09:34:10 -040052
53#include <trace/events/rpcgss.h>
54
Simo Sorce030d7942012-05-25 18:09:56 -040055#include "gss_rpc_upcall.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +040057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
59 * into replies.
60 *
61 * Key is context handle (\x if empty) and gss_token.
62 * Content is major_status minor_status (integers) context_handle, reply_token.
63 *
64 */
65
66static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
67{
68 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
69}
70
71#define RSI_HASHBITS 6
72#define RSI_HASHMAX (1<<RSI_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74struct rsi {
75 struct cache_head h;
76 struct xdr_netobj in_handle, in_token;
77 struct xdr_netobj out_handle, out_token;
78 int major_status, minor_status;
Trond Myklebust6d1616b2018-10-01 10:41:48 -040079 struct rcu_head rcu_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080};
81
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +040082static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
83static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85static void rsi_free(struct rsi *rsii)
86{
87 kfree(rsii->in_handle.data);
88 kfree(rsii->in_token.data);
89 kfree(rsii->out_handle.data);
90 kfree(rsii->out_token.data);
91}
92
Trond Myklebust6d1616b2018-10-01 10:41:48 -040093static void rsi_free_rcu(struct rcu_head *head)
94{
95 struct rsi *rsii = container_of(head, struct rsi, rcu_head);
96
97 rsi_free(rsii);
98 kfree(rsii);
99}
100
NeilBrownbaab9352006-03-27 01:15:09 -0800101static void rsi_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
NeilBrownbaab9352006-03-27 01:15:09 -0800103 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
Trond Myklebust6d1616b2018-10-01 10:41:48 -0400104
105 call_rcu(&rsii->rcu_head, rsi_free_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
108static inline int rsi_hash(struct rsi *item)
109{
110 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
111 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
112}
113
NeilBrownd4d11ea2006-03-27 01:15:04 -0800114static int rsi_match(struct cache_head *a, struct cache_head *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
NeilBrownd4d11ea2006-03-27 01:15:04 -0800116 struct rsi *item = container_of(a, struct rsi, h);
117 struct rsi *tmp = container_of(b, struct rsi, h);
Joe Perchesf64f9e72009-11-29 16:55:45 -0800118 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
119 netobj_equal(&item->in_token, &tmp->in_token);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
121
122static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
123{
124 dst->len = len;
Arnaldo Carvalho de Meloe69062b2006-11-21 01:21:34 -0200125 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 if (len && !dst->data)
127 return -ENOMEM;
128 return 0;
129}
130
131static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
132{
133 return dup_to_netobj(dst, src->data, src->len);
134}
135
NeilBrownd4d11ea2006-03-27 01:15:04 -0800136static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
NeilBrownd4d11ea2006-03-27 01:15:04 -0800138 struct rsi *new = container_of(cnew, struct rsi, h);
139 struct rsi *item = container_of(citem, struct rsi, h);
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 new->out_handle.data = NULL;
142 new->out_handle.len = 0;
143 new->out_token.data = NULL;
144 new->out_token.len = 0;
145 new->in_handle.len = item->in_handle.len;
146 item->in_handle.len = 0;
147 new->in_token.len = item->in_token.len;
148 item->in_token.len = 0;
149 new->in_handle.data = item->in_handle.data;
150 item->in_handle.data = NULL;
151 new->in_token.data = item->in_token.data;
152 item->in_token.data = NULL;
153}
154
NeilBrownd4d11ea2006-03-27 01:15:04 -0800155static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
NeilBrownd4d11ea2006-03-27 01:15:04 -0800157 struct rsi *new = container_of(cnew, struct rsi, h);
158 struct rsi *item = container_of(citem, struct rsi, h);
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 BUG_ON(new->out_handle.data || new->out_token.data);
161 new->out_handle.len = item->out_handle.len;
162 item->out_handle.len = 0;
163 new->out_token.len = item->out_token.len;
164 item->out_token.len = 0;
165 new->out_handle.data = item->out_handle.data;
166 item->out_handle.data = NULL;
167 new->out_token.data = item->out_token.data;
168 item->out_token.data = NULL;
169
170 new->major_status = item->major_status;
171 new->minor_status = item->minor_status;
172}
173
NeilBrownd4d11ea2006-03-27 01:15:04 -0800174static struct cache_head *rsi_alloc(void)
175{
176 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
177 if (rsii)
178 return &rsii->h;
179 else
180 return NULL;
181}
182
Trond Myklebust65286b82020-03-01 18:21:42 -0500183static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
184{
185 return sunrpc_cache_pipe_upcall_timeout(cd, h);
186}
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static void rsi_request(struct cache_detail *cd,
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800189 struct cache_head *h,
190 char **bpp, int *blen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 struct rsi *rsii = container_of(h, struct rsi, h);
193
194 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
195 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
196 (*bpp)[-1] = '\n';
197}
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199static int rsi_parse(struct cache_detail *cd,
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800200 char *mesg, int mlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
202 /* context token expiry major minor context token */
203 char *buf = mesg;
204 char *ep;
205 int len;
206 struct rsi rsii, *rsip = NULL;
Arnd Bergmannf5599352017-10-20 16:34:42 +0200207 time64_t expiry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 int status = -EINVAL;
209
210 memset(&rsii, 0, sizeof(rsii));
211 /* handle */
212 len = qword_get(&mesg, buf, mlen);
213 if (len < 0)
214 goto out;
215 status = -ENOMEM;
216 if (dup_to_netobj(&rsii.in_handle, buf, len))
217 goto out;
218
219 /* token */
220 len = qword_get(&mesg, buf, mlen);
221 status = -EINVAL;
222 if (len < 0)
223 goto out;
224 status = -ENOMEM;
225 if (dup_to_netobj(&rsii.in_token, buf, len))
226 goto out;
227
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400228 rsip = rsi_lookup(cd, &rsii);
NeilBrownd4d11ea2006-03-27 01:15:04 -0800229 if (!rsip)
230 goto out;
231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 rsii.h.flags = 0;
233 /* expiry */
234 expiry = get_expiry(&mesg);
235 status = -EINVAL;
236 if (expiry == 0)
237 goto out;
238
239 /* major/minor */
240 len = qword_get(&mesg, buf, mlen);
J. Bruce Fieldsb39c18f2008-01-06 21:32:37 -0500241 if (len <= 0)
242 goto out;
243 rsii.major_status = simple_strtoul(buf, &ep, 10);
244 if (*ep)
245 goto out;
246 len = qword_get(&mesg, buf, mlen);
247 if (len <= 0)
248 goto out;
249 rsii.minor_status = simple_strtoul(buf, &ep, 10);
250 if (*ep)
251 goto out;
252
253 /* out_handle */
254 len = qword_get(&mesg, buf, mlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 if (len < 0)
256 goto out;
J. Bruce Fieldsb39c18f2008-01-06 21:32:37 -0500257 status = -ENOMEM;
258 if (dup_to_netobj(&rsii.out_handle, buf, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
J. Bruce Fieldsb39c18f2008-01-06 21:32:37 -0500261 /* out_token */
262 len = qword_get(&mesg, buf, mlen);
263 status = -EINVAL;
264 if (len < 0)
265 goto out;
266 status = -ENOMEM;
267 if (dup_to_netobj(&rsii.out_token, buf, len))
268 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 rsii.h.expiry_time = expiry;
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400270 rsip = rsi_update(cd, &rsii, rsip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 status = 0;
272out:
273 rsi_free(&rsii);
274 if (rsip)
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400275 cache_put(&rsip->h, cd);
NeilBrownd4d11ea2006-03-27 01:15:04 -0800276 else
277 status = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 return status;
279}
280
Bhumika Goyalee24eac2017-10-17 18:14:26 +0200281static const struct cache_detail rsi_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700282 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 .hash_size = RSI_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 .name = "auth.rpcsec.init",
285 .cache_put = rsi_put,
Trond Myklebust65286b82020-03-01 18:21:42 -0500286 .cache_upcall = rsi_upcall,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300287 .cache_request = rsi_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 .cache_parse = rsi_parse,
NeilBrownd4d11ea2006-03-27 01:15:04 -0800289 .match = rsi_match,
290 .init = rsi_init,
291 .update = update_rsi,
292 .alloc = rsi_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293};
294
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400295static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
NeilBrownd4d11ea2006-03-27 01:15:04 -0800296{
297 struct cache_head *ch;
298 int hash = rsi_hash(item);
299
Trond Myklebust6d1616b2018-10-01 10:41:48 -0400300 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
NeilBrownd4d11ea2006-03-27 01:15:04 -0800301 if (ch)
302 return container_of(ch, struct rsi, h);
303 else
304 return NULL;
305}
306
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400307static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
NeilBrownd4d11ea2006-03-27 01:15:04 -0800308{
309 struct cache_head *ch;
310 int hash = rsi_hash(new);
311
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400312 ch = sunrpc_cache_update(cd, &new->h,
NeilBrownd4d11ea2006-03-27 01:15:04 -0800313 &old->h, hash);
314 if (ch)
315 return container_of(ch, struct rsi, h);
316 else
317 return NULL;
318}
319
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321/*
322 * The rpcsec_context cache is used to store a context that is
323 * used in data exchange.
324 * The key is a context handle. The content is:
325 * uid, gidlist, mechanism, service-set, mech-specific-data
326 */
327
328#define RSC_HASHBITS 10
329#define RSC_HASHMAX (1<<RSC_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331#define GSS_SEQ_WIN 128
332
333struct gss_svc_seq_data {
334 /* highest seq number seen so far: */
335 int sd_max;
336 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
337 * sd_win is nonzero iff sequence number i has been seen already: */
338 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
339 spinlock_t sd_lock;
340};
341
342struct rsc {
343 struct cache_head h;
344 struct xdr_netobj handle;
345 struct svc_cred cred;
346 struct gss_svc_seq_data seqdata;
347 struct gss_ctx *mechctx;
Trond Myklebust6d1616b2018-10-01 10:41:48 -0400348 struct rcu_head rcu_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349};
350
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400351static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
352static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354static void rsc_free(struct rsc *rsci)
355{
356 kfree(rsci->handle.data);
357 if (rsci->mechctx)
358 gss_delete_sec_context(&rsci->mechctx);
J. Bruce Fields03a4e1f2012-05-14 19:55:22 -0400359 free_svc_cred(&rsci->cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
361
Trond Myklebust6d1616b2018-10-01 10:41:48 -0400362static void rsc_free_rcu(struct rcu_head *head)
363{
364 struct rsc *rsci = container_of(head, struct rsc, rcu_head);
365
366 kfree(rsci->handle.data);
367 kfree(rsci);
368}
369
NeilBrownbaab9352006-03-27 01:15:09 -0800370static void rsc_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
NeilBrownbaab9352006-03-27 01:15:09 -0800372 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Trond Myklebust6d1616b2018-10-01 10:41:48 -0400374 if (rsci->mechctx)
375 gss_delete_sec_context(&rsci->mechctx);
376 free_svc_cred(&rsci->cred);
377 call_rcu(&rsci->rcu_head, rsc_free_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
380static inline int
381rsc_hash(struct rsc *rsci)
382{
383 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
384}
385
NeilBrown17f834b2006-03-27 01:15:05 -0800386static int
387rsc_match(struct cache_head *a, struct cache_head *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
NeilBrown17f834b2006-03-27 01:15:05 -0800389 struct rsc *new = container_of(a, struct rsc, h);
390 struct rsc *tmp = container_of(b, struct rsc, h);
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return netobj_equal(&new->handle, &tmp->handle);
393}
394
NeilBrown17f834b2006-03-27 01:15:05 -0800395static void
396rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
NeilBrown17f834b2006-03-27 01:15:05 -0800398 struct rsc *new = container_of(cnew, struct rsc, h);
399 struct rsc *tmp = container_of(ctmp, struct rsc, h);
400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 new->handle.len = tmp->handle.len;
402 tmp->handle.len = 0;
403 new->handle.data = tmp->handle.data;
404 tmp->handle.data = NULL;
405 new->mechctx = NULL;
J. Bruce Fields44234062013-05-14 16:53:40 -0400406 init_svc_cred(&new->cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
NeilBrown17f834b2006-03-27 01:15:05 -0800409static void
410update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
NeilBrown17f834b2006-03-27 01:15:05 -0800412 struct rsc *new = container_of(cnew, struct rsc, h);
413 struct rsc *tmp = container_of(ctmp, struct rsc, h);
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 new->mechctx = tmp->mechctx;
416 tmp->mechctx = NULL;
417 memset(&new->seqdata, 0, sizeof(new->seqdata));
418 spin_lock_init(&new->seqdata.sd_lock);
419 new->cred = tmp->cred;
J. Bruce Fields44234062013-05-14 16:53:40 -0400420 init_svc_cred(&tmp->cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
422
NeilBrown17f834b2006-03-27 01:15:05 -0800423static struct cache_head *
424rsc_alloc(void)
425{
426 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
427 if (rsci)
428 return &rsci->h;
429 else
430 return NULL;
431}
432
Trond Myklebust65286b82020-03-01 18:21:42 -0500433static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
434{
435 return -EINVAL;
436}
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438static int rsc_parse(struct cache_detail *cd,
439 char *mesg, int mlen)
440{
441 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
442 char *buf = mesg;
Eric W. Biederman683428fae2013-02-02 01:40:53 -0800443 int id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 int len, rv;
445 struct rsc rsci, *rscp = NULL;
Arnd Bergmann294ec5b2018-06-07 17:02:50 +0200446 time64_t expiry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 int status = -EINVAL;
J. Bruce Fields1df0cad2006-06-30 01:56:16 -0700448 struct gss_api_mech *gm = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 memset(&rsci, 0, sizeof(rsci));
451 /* context handle */
452 len = qword_get(&mesg, buf, mlen);
453 if (len < 0) goto out;
454 status = -ENOMEM;
455 if (dup_to_netobj(&rsci.handle, buf, len))
456 goto out;
457
458 rsci.h.flags = 0;
459 /* expiry */
460 expiry = get_expiry(&mesg);
461 status = -EINVAL;
462 if (expiry == 0)
463 goto out;
464
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400465 rscp = rsc_lookup(cd, &rsci);
NeilBrown17f834b2006-03-27 01:15:05 -0800466 if (!rscp)
467 goto out;
468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 /* uid, or NEGATIVE */
Eric W. Biederman683428fae2013-02-02 01:40:53 -0800470 rv = get_int(&mesg, &id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 if (rv == -EINVAL)
472 goto out;
473 if (rv == -ENOENT)
474 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
475 else {
476 int N, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
J. Bruce Fields3c34ae12013-03-04 08:44:01 -0500478 /*
479 * NOTE: we skip uid_valid()/gid_valid() checks here:
480 * instead, * -1 id's are later mapped to the
481 * (export-specific) anonymous id by nfsd_setuser.
482 *
483 * (But supplementary gid's get no such special
484 * treatment so are checked for validity here.)
485 */
Eric W. Biederman683428fae2013-02-02 01:40:53 -0800486 /* uid */
Trond Myklebuste6667c72019-04-09 12:13:41 -0400487 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
Eric W. Biederman683428fae2013-02-02 01:40:53 -0800488
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 /* gid */
Eric W. Biederman683428fae2013-02-02 01:40:53 -0800490 if (get_int(&mesg, &id))
491 goto out;
Trond Myklebuste6667c72019-04-09 12:13:41 -0400492 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 /* number of additional gid's */
495 if (get_int(&mesg, &N))
496 goto out;
Dan Carpenter76cb4be2015-02-24 18:34:01 +0300497 if (N < 0 || N > NGROUPS_MAX)
498 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 status = -ENOMEM;
500 rsci.cred.cr_group_info = groups_alloc(N);
501 if (rsci.cred.cr_group_info == NULL)
502 goto out;
503
504 /* gid's */
505 status = -EINVAL;
506 for (i=0; i<N; i++) {
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800507 kgid_t kgid;
Eric W. Biederman683428fae2013-02-02 01:40:53 -0800508 if (get_int(&mesg, &id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 goto out;
Trond Myklebuste6667c72019-04-09 12:13:41 -0400510 kgid = make_kgid(current_user_ns(), id);
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800511 if (!gid_valid(kgid))
512 goto out;
Alexey Dobriyan81243ea2016-10-07 17:03:12 -0700513 rsci.cred.cr_group_info->gid[i] = kgid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 }
Thiago Rafael Beckerbdcf0a42017-12-14 15:33:12 -0800515 groups_sort(rsci.cred.cr_group_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 /* mech name */
518 len = qword_get(&mesg, buf, mlen);
519 if (len < 0)
520 goto out;
J. Bruce Fields0dc15312013-05-14 16:07:13 -0400521 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 status = -EOPNOTSUPP;
523 if (!gm)
524 goto out;
525
526 status = -EINVAL;
527 /* mech-specific data: */
528 len = qword_get(&mesg, buf, mlen);
J. Bruce Fields1df0cad2006-06-30 01:56:16 -0700529 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 goto out;
Simo Sorce400f26b2012-05-25 18:09:53 -0400531 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
532 NULL, GFP_KERNEL);
J. Bruce Fields1df0cad2006-06-30 01:56:16 -0700533 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 goto out;
Olga Kornievskaia68e76ad2008-12-23 16:17:15 -0500535
536 /* get client name */
537 len = qword_get(&mesg, buf, mlen);
538 if (len > 0) {
J. Bruce Fields03a4e1f2012-05-14 19:55:22 -0400539 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
Wei Yongjun1eb6d622013-04-18 10:49:09 +0800540 if (!rsci.cred.cr_principal) {
541 status = -ENOMEM;
Olga Kornievskaia68e76ad2008-12-23 16:17:15 -0500542 goto out;
Wei Yongjun1eb6d622013-04-18 10:49:09 +0800543 }
Olga Kornievskaia68e76ad2008-12-23 16:17:15 -0500544 }
545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 }
547 rsci.h.expiry_time = expiry;
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400548 rscp = rsc_update(cd, &rsci, rscp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 status = 0;
550out:
551 rsc_free(&rsci);
552 if (rscp)
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400553 cache_put(&rscp->h, cd);
NeilBrown17f834b2006-03-27 01:15:05 -0800554 else
555 status = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 return status;
557}
558
Bhumika Goyalee24eac2017-10-17 18:14:26 +0200559static const struct cache_detail rsc_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700560 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 .hash_size = RSC_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 .name = "auth.rpcsec.context",
563 .cache_put = rsc_put,
Trond Myklebust65286b82020-03-01 18:21:42 -0500564 .cache_upcall = rsc_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 .cache_parse = rsc_parse,
NeilBrown17f834b2006-03-27 01:15:05 -0800566 .match = rsc_match,
567 .init = rsc_init,
568 .update = update_rsc,
569 .alloc = rsc_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570};
571
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400572static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
NeilBrown17f834b2006-03-27 01:15:05 -0800573{
574 struct cache_head *ch;
575 int hash = rsc_hash(item);
576
Trond Myklebust6d1616b2018-10-01 10:41:48 -0400577 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
NeilBrown17f834b2006-03-27 01:15:05 -0800578 if (ch)
579 return container_of(ch, struct rsc, h);
580 else
581 return NULL;
582}
583
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400584static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
NeilBrown17f834b2006-03-27 01:15:05 -0800585{
586 struct cache_head *ch;
587 int hash = rsc_hash(new);
588
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400589 ch = sunrpc_cache_update(cd, &new->h,
NeilBrown17f834b2006-03-27 01:15:05 -0800590 &old->h, hash);
591 if (ch)
592 return container_of(ch, struct rsc, h);
593 else
594 return NULL;
595}
596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598static struct rsc *
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400599gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
601 struct rsc rsci;
602 struct rsc *found;
603
604 memset(&rsci, 0, sizeof(rsci));
Chuck Leverbf2c4b62016-09-01 10:50:38 -0400605 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
606 return NULL;
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400607 found = rsc_lookup(cd, &rsci);
Chuck Leverbf2c4b62016-09-01 10:50:38 -0400608 rsc_free(&rsci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (!found)
610 return NULL;
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +0400611 if (cache_check(cd, &found->h, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 return NULL;
613 return found;
614}
615
616/* Implements sequence number algorithm as specified in RFC 2203. */
617static int
618gss_check_seq_num(struct rsc *rsci, int seq_num)
619{
620 struct gss_svc_seq_data *sd = &rsci->seqdata;
621
622 spin_lock(&sd->sd_lock);
623 if (seq_num > sd->sd_max) {
624 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
625 memset(sd->sd_win,0,sizeof(sd->sd_win));
626 sd->sd_max = seq_num;
627 } else while (sd->sd_max < seq_num) {
628 sd->sd_max++;
629 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
630 }
631 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
632 goto ok;
633 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
634 goto drop;
635 }
636 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
637 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
638 goto drop;
639ok:
640 spin_unlock(&sd->sd_lock);
641 return 1;
642drop:
643 spin_unlock(&sd->sd_lock);
644 return 0;
645}
646
647static inline u32 round_up_to_quad(u32 i)
648{
649 return (i + 3 ) & ~3;
650}
651
652static inline int
653svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
654{
655 int l;
656
657 if (argv->iov_len < 4)
658 return -1;
Alexey Dobriyan76994312006-09-26 22:28:46 -0700659 o->len = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 l = round_up_to_quad(o->len);
661 if (argv->iov_len < l)
662 return -1;
663 o->data = argv->iov_base;
664 argv->iov_base += l;
665 argv->iov_len -= l;
666 return 0;
667}
668
669static inline int
670svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
671{
Al Viro753ed902006-09-26 22:30:23 -0700672 u8 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673
674 if (resv->iov_len + 4 > PAGE_SIZE)
675 return -1;
Alexey Dobriyan76994312006-09-26 22:28:46 -0700676 svc_putnl(resv, o->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 p = resv->iov_base + resv->iov_len;
678 resv->iov_len += round_up_to_quad(o->len);
679 if (resv->iov_len > PAGE_SIZE)
680 return -1;
681 memcpy(p, o->data, o->len);
Al Viro753ed902006-09-26 22:30:23 -0700682 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 return 0;
684}
685
J. Bruce Fields21fcd022007-08-09 20:16:22 -0400686/*
687 * Verify the checksum on the header and return SVC_OK on success.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
689 * or return SVC_DENIED and indicate error in authp.
690 */
691static int
692gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700693 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
695 struct gss_ctx *ctx_id = rsci->mechctx;
696 struct xdr_buf rpchdr;
697 struct xdr_netobj checksum;
698 u32 flavor = 0;
699 struct kvec *argv = &rqstp->rq_arg.head[0];
700 struct kvec iov;
701
702 /* data to compute the checksum over: */
703 iov.iov_base = rpcstart;
704 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
705 xdr_buf_from_iov(&iov, &rpchdr);
706
707 *authp = rpc_autherr_badverf;
708 if (argv->iov_len < 4)
709 return SVC_DENIED;
Alexey Dobriyan76994312006-09-26 22:28:46 -0700710 flavor = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 if (flavor != RPC_AUTH_GSS)
712 return SVC_DENIED;
713 if (svc_safe_getnetobj(argv, &checksum))
714 return SVC_DENIED;
715
716 if (rqstp->rq_deferred) /* skip verification of revisited request */
717 return SVC_OK;
J. Bruce Fields00fd6e12005-10-13 16:55:18 -0400718 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 *authp = rpcsec_gsserr_credproblem;
720 return SVC_DENIED;
721 }
722
723 if (gc->gc_seq > MAXSEQ) {
Chuck Lever28155522020-03-02 15:16:06 -0500724 trace_rpcgss_svc_large_seqno(rqstp->rq_xid, gc->gc_seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 *authp = rpcsec_gsserr_ctxproblem;
726 return SVC_DENIED;
727 }
728 if (!gss_check_seq_num(rsci, gc->gc_seq)) {
Chuck Lever28155522020-03-02 15:16:06 -0500729 trace_rpcgss_svc_old_seqno(rqstp->rq_xid, gc->gc_seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 return SVC_DROP;
731 }
732 return SVC_OK;
733}
734
735static int
Andy Adamson822f1002006-01-18 17:43:24 -0800736gss_write_null_verf(struct svc_rqst *rqstp)
737{
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700738 __be32 *p;
Andy Adamson822f1002006-01-18 17:43:24 -0800739
Alexey Dobriyan76994312006-09-26 22:28:46 -0700740 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
Andy Adamson822f1002006-01-18 17:43:24 -0800741 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
742 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
743 *p++ = 0;
744 if (!xdr_ressize_check(rqstp, p))
745 return -1;
746 return 0;
747}
748
749static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
751{
J. Bruce Fields2876a342016-10-18 16:30:09 -0400752 __be32 *xdr_seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 u32 maj_stat;
754 struct xdr_buf verf_data;
755 struct xdr_netobj mic;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700756 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 struct kvec iov;
J. Bruce Fields2876a342016-10-18 16:30:09 -0400758 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Alexey Dobriyan76994312006-09-26 22:28:46 -0700760 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
J. Bruce Fields2876a342016-10-18 16:30:09 -0400761 xdr_seq = kmalloc(4, GFP_KERNEL);
762 if (!xdr_seq)
763 return -1;
764 *xdr_seq = htonl(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
J. Bruce Fields2876a342016-10-18 16:30:09 -0400766 iov.iov_base = xdr_seq;
767 iov.iov_len = 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 xdr_buf_from_iov(&iov, &verf_data);
769 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
770 mic.data = (u8 *)(p + 1);
J. Bruce Fields00fd6e12005-10-13 16:55:18 -0400771 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 if (maj_stat != GSS_S_COMPLETE)
J. Bruce Fields2876a342016-10-18 16:30:09 -0400773 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 *p++ = htonl(mic.len);
775 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
776 p += XDR_QUADLEN(mic.len);
777 if (!xdr_ressize_check(rqstp, p))
J. Bruce Fields2876a342016-10-18 16:30:09 -0400778 goto out;
779 err = 0;
780out:
781 kfree(xdr_seq);
782 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783}
784
785struct gss_domain {
786 struct auth_domain h;
787 u32 pseudoflavor;
788};
789
790static struct auth_domain *
791find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
792{
793 char *name;
794
795 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
796 if (!name)
797 return NULL;
798 return auth_domain_find(name);
799}
800
NeilBrownefc36aa2006-03-27 01:14:59 -0800801static struct auth_ops svcauthops_gss;
802
J. Bruce Fields4796f452007-07-17 04:04:51 -0700803u32 svcauth_gss_flavor(struct auth_domain *dom)
804{
805 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
806
807 return gd->pseudoflavor;
808}
809
Trond Myklebust7bd88262008-12-23 15:21:32 -0500810EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
J. Bruce Fields4796f452007-07-17 04:04:51 -0700811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812int
813svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
814{
815 struct gss_domain *new;
816 struct auth_domain *test;
817 int stat = -ENOMEM;
818
819 new = kmalloc(sizeof(*new), GFP_KERNEL);
820 if (!new)
821 goto out;
NeilBrownefc36aa2006-03-27 01:14:59 -0800822 kref_init(&new->h.ref);
Arnaldo Carvalho de Meloe69062b2006-11-21 01:21:34 -0200823 new->h.name = kstrdup(name, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 if (!new->h.name)
825 goto out_free_dom;
NeilBrownefc36aa2006-03-27 01:14:59 -0800826 new->h.flavour = &svcauthops_gss;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 new->pseudoflavor = pseudoflavor;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
J. Bruce Fieldscb276802007-07-23 18:43:52 -0700829 stat = 0;
NeilBrownefc36aa2006-03-27 01:14:59 -0800830 test = auth_domain_lookup(name, &new->h);
J. Bruce Fieldscb276802007-07-23 18:43:52 -0700831 if (test != &new->h) { /* Duplicate registration */
832 auth_domain_put(test);
833 kfree(new->h.name);
834 goto out_free_dom;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 }
836 return 0;
837
838out_free_dom:
839 kfree(new);
840out:
841 return stat;
842}
843
Trond Myklebust7bd88262008-12-23 15:21:32 -0500844EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
846static inline int
847read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
848{
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700849 __be32 raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 int status;
851
852 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
853 if (status)
854 return status;
855 *obj = ntohl(raw);
856 return 0;
857}
858
859/* It would be nice if this bit of code could be shared with the client.
860 * Obstacles:
861 * The client shouldn't malloc(), would have to pass in own memory.
862 * The server uses base of head iovec as read pointer, while the
863 * client uses separate pointer. */
864static int
Jeff Layton4c190e22013-02-06 08:28:55 -0500865unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866{
867 int stat = -EINVAL;
868 u32 integ_len, maj_stat;
869 struct xdr_netobj mic;
870 struct xdr_buf integ_buf;
871
Chuck Lever06eb8a52017-06-19 14:00:40 -0400872 /* NFS READ normally uses splice to send data in-place. However
873 * the data in cache can change after the reply's MIC is computed
874 * but before the RPC reply is sent. To prevent the client from
875 * rejecting the server-computed MIC in this somewhat rare case,
876 * do not use splice with the GSS integrity service.
877 */
878 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
879
Jeff Layton4c190e22013-02-06 08:28:55 -0500880 /* Did we already verify the signature on the original pass through? */
881 if (rqstp->rq_deferred)
882 return 0;
883
Alexey Dobriyan76994312006-09-26 22:28:46 -0700884 integ_len = svc_getnl(&buf->head[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 if (integ_len & 3)
J.Bruce Fieldsb797b5b2006-12-13 00:35:19 -0800886 return stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 if (integ_len > buf->len)
J.Bruce Fieldsb797b5b2006-12-13 00:35:19 -0800888 return stat;
J. Bruce Fields1754eb22017-10-24 14:58:11 -0400889 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) {
890 WARN_ON_ONCE(1);
891 return stat;
892 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 /* copy out mic... */
894 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
J. Bruce Fields1754eb22017-10-24 14:58:11 -0400895 return stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 if (mic.len > RPC_MAX_AUTH_SIZE)
J.Bruce Fieldsb797b5b2006-12-13 00:35:19 -0800897 return stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 mic.data = kmalloc(mic.len, GFP_KERNEL);
899 if (!mic.data)
J.Bruce Fieldsb797b5b2006-12-13 00:35:19 -0800900 return stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
902 goto out;
J. Bruce Fields00fd6e12005-10-13 16:55:18 -0400903 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 if (maj_stat != GSS_S_COMPLETE)
905 goto out;
Alexey Dobriyan76994312006-09-26 22:28:46 -0700906 if (svc_getnl(&buf->head[0]) != seq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 goto out;
Tomáš Trnkac0cb8bf2016-05-20 16:41:10 +0200908 /* trim off the mic and padding at the end before returning */
Chuck Lever241b1f42019-02-11 11:25:09 -0500909 buf->len -= 4 + round_up_to_quad(mic.len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 stat = 0;
911out:
J.Bruce Fieldsb797b5b2006-12-13 00:35:19 -0800912 kfree(mic.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 return stat;
914}
915
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -0700916static inline int
917total_buf_len(struct xdr_buf *buf)
918{
919 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
920}
921
922static void
923fix_priv_head(struct xdr_buf *buf, int pad)
924{
925 if (buf->page_len == 0) {
926 /* We need to adjust head and buf->len in tandem in this
927 * case to make svc_defer() work--it finds the original
928 * buffer start using buf->len - buf->head[0].iov_len. */
929 buf->head[0].iov_len -= pad;
930 }
931}
932
933static int
934unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
935{
936 u32 priv_len, maj_stat;
937 int pad, saved_len, remaining_len, offset;
938
Jeff Layton779fb0f2014-11-19 07:51:18 -0500939 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -0700940
Alexey Dobriyan76994312006-09-26 22:28:46 -0700941 priv_len = svc_getnl(&buf->head[0]);
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -0700942 if (rqstp->rq_deferred) {
943 /* Already decrypted last time through! The sequence number
944 * check at out_seq is unnecessary but harmless: */
945 goto out_seq;
946 }
947 /* buf->len is the number of bytes from the original start of the
948 * request to the end, where head[0].iov_len is just the bytes
949 * not yet read from the head, so these two values are different: */
950 remaining_len = total_buf_len(buf);
951 if (priv_len > remaining_len)
952 return -EINVAL;
953 pad = remaining_len - priv_len;
954 buf->len -= pad;
955 fix_priv_head(buf, pad);
956
957 /* Maybe it would be better to give gss_unwrap a length parameter: */
958 saved_len = buf->len;
959 buf->len = priv_len;
960 maj_stat = gss_unwrap(ctx, 0, buf);
961 pad = priv_len - buf->len;
962 buf->len = saved_len;
963 buf->len -= pad;
964 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
965 * In the krb5p case, at least, the data ends up offset, so we need to
966 * move it around. */
967 /* XXX: This is very inefficient. It would be better to either do
968 * this while we encrypt, or maybe in the receive code, if we can peak
969 * ahead and work out the service and mechanism there. */
Chuck Lever96f194b2020-03-02 15:01:08 -0500970 offset = xdr_pad_size(buf->head[0].iov_len);
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -0700971 if (offset) {
972 buf->buflen = RPCSVC_MAXPAYLOAD;
973 xdr_shift_buf(buf, offset);
974 fix_priv_head(buf, pad);
975 }
976 if (maj_stat != GSS_S_COMPLETE)
977 return -EINVAL;
978out_seq:
Alexey Dobriyan76994312006-09-26 22:28:46 -0700979 if (svc_getnl(&buf->head[0]) != seq)
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -0700980 return -EINVAL;
981 return 0;
982}
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984struct gss_svc_data {
985 /* decoded gss client cred: */
986 struct rpc_gss_wire_cred clcred;
J.Bruce Fields5b304bc2006-10-04 02:16:07 -0700987 /* save a pointer to the beginning of the encoded verifier,
988 * for use in encryption/checksumming in svcauth_gss_release: */
989 __be32 *verf_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 struct rsc *rsci;
991};
992
993static int
994svcauth_gss_set_client(struct svc_rqst *rqstp)
995{
996 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
997 struct rsc *rsci = svcdata->rsci;
998 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700999 int stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001001 /*
1002 * A gss export can be specified either by:
1003 * export *(sec=krb5,rw)
1004 * or by
1005 * export gss/krb5(rw)
1006 * The latter is deprecated; but for backwards compatibility reasons
1007 * the nfsd code will still fall back on trying it if the former
1008 * doesn't work; so we try to make both available to nfsd, below.
1009 */
1010 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1011 if (rqstp->rq_gssclient == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 return SVC_DENIED;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001013 stat = svcauth_unix_set_client(rqstp);
NeilBrown1ebede82010-08-12 17:04:07 +10001014 if (stat == SVC_DROP || stat == SVC_CLOSE)
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001015 return stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 return SVC_OK;
1017}
1018
Kevin Coffman91a47622006-01-18 17:43:25 -08001019static inline int
Simo Sorcefc2952a2012-04-17 09:39:06 -04001020gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1021 struct xdr_netobj *out_handle, int *major_status)
Kevin Coffman91a47622006-01-18 17:43:25 -08001022{
1023 struct rsc *rsci;
Frank Filz54f92472007-05-09 02:34:53 -07001024 int rc;
Kevin Coffman91a47622006-01-18 17:43:25 -08001025
Simo Sorcefc2952a2012-04-17 09:39:06 -04001026 if (*major_status != GSS_S_COMPLETE)
Kevin Coffman91a47622006-01-18 17:43:25 -08001027 return gss_write_null_verf(rqstp);
Simo Sorcefc2952a2012-04-17 09:39:06 -04001028 rsci = gss_svc_searchbyctx(cd, out_handle);
Kevin Coffman91a47622006-01-18 17:43:25 -08001029 if (rsci == NULL) {
Simo Sorcefc2952a2012-04-17 09:39:06 -04001030 *major_status = GSS_S_NO_CONTEXT;
Kevin Coffman91a47622006-01-18 17:43:25 -08001031 return gss_write_null_verf(rqstp);
1032 }
Frank Filz54f92472007-05-09 02:34:53 -07001033 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001034 cache_put(&rsci->h, cd);
Frank Filz54f92472007-05-09 02:34:53 -07001035 return rc;
Kevin Coffman91a47622006-01-18 17:43:25 -08001036}
1037
Simo Sorcefc2952a2012-04-17 09:39:06 -04001038static inline int
Simo Sorce030d7942012-05-25 18:09:56 -04001039gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1040 struct kvec *argv, __be32 *authp,
1041 struct xdr_netobj *in_handle)
Simo Sorcefc2952a2012-04-17 09:39:06 -04001042{
Simo Sorcefc2952a2012-04-17 09:39:06 -04001043 /* Read the verifier; should be NULL: */
1044 *authp = rpc_autherr_badverf;
1045 if (argv->iov_len < 2 * 4)
1046 return SVC_DENIED;
1047 if (svc_getnl(argv) != RPC_AUTH_NULL)
1048 return SVC_DENIED;
1049 if (svc_getnl(argv) != 0)
1050 return SVC_DENIED;
1051 /* Martial context handle and token for upcall: */
1052 *authp = rpc_autherr_badcred;
1053 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1054 return SVC_DENIED;
1055 if (dup_netobj(in_handle, &gc->gc_ctx))
1056 return SVC_CLOSE;
1057 *authp = rpc_autherr_badverf;
Simo Sorce030d7942012-05-25 18:09:56 -04001058
1059 return 0;
1060}
1061
1062static inline int
1063gss_read_verf(struct rpc_gss_wire_cred *gc,
1064 struct kvec *argv, __be32 *authp,
1065 struct xdr_netobj *in_handle,
1066 struct xdr_netobj *in_token)
1067{
1068 struct xdr_netobj tmpobj;
1069 int res;
1070
1071 res = gss_read_common_verf(gc, argv, authp, in_handle);
1072 if (res)
1073 return res;
1074
Simo Sorcefc2952a2012-04-17 09:39:06 -04001075 if (svc_safe_getnetobj(argv, &tmpobj)) {
1076 kfree(in_handle->data);
1077 return SVC_DENIED;
1078 }
1079 if (dup_netobj(in_token, &tmpobj)) {
1080 kfree(in_handle->data);
1081 return SVC_CLOSE;
1082 }
1083
1084 return 0;
1085}
1086
Chuck Lever5866efa2019-10-24 09:34:16 -04001087static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1088{
1089 u32 inlen;
1090 int i;
1091
1092 i = 0;
1093 inlen = in_token->page_len;
1094 while (inlen) {
1095 if (in_token->pages[i])
1096 put_page(in_token->pages[i]);
1097 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1098 }
1099
1100 kfree(in_token->pages);
1101 in_token->pages = NULL;
1102}
1103
1104static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1105 struct rpc_gss_wire_cred *gc, __be32 *authp,
1106 struct xdr_netobj *in_handle,
1107 struct gssp_in_token *in_token)
Simo Sorce030d7942012-05-25 18:09:56 -04001108{
1109 struct kvec *argv = &rqstp->rq_arg.head[0];
Chuck Lever5866efa2019-10-24 09:34:16 -04001110 unsigned int page_base, length;
1111 int pages, i, res;
1112 size_t inlen;
Simo Sorce030d7942012-05-25 18:09:56 -04001113
1114 res = gss_read_common_verf(gc, argv, authp, in_handle);
1115 if (res)
1116 return res;
1117
1118 inlen = svc_getnl(argv);
1119 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1120 return SVC_DENIED;
1121
Chuck Lever5866efa2019-10-24 09:34:16 -04001122 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1123 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1124 if (!in_token->pages)
1125 return SVC_DENIED;
1126 in_token->page_base = 0;
Simo Sorce030d7942012-05-25 18:09:56 -04001127 in_token->page_len = inlen;
Chuck Lever5866efa2019-10-24 09:34:16 -04001128 for (i = 0; i < pages; i++) {
1129 in_token->pages[i] = alloc_page(GFP_KERNEL);
1130 if (!in_token->pages[i]) {
1131 gss_free_in_token_pages(in_token);
1132 return SVC_DENIED;
1133 }
1134 }
Simo Sorce030d7942012-05-25 18:09:56 -04001135
Chuck Lever5866efa2019-10-24 09:34:16 -04001136 length = min_t(unsigned int, inlen, argv->iov_len);
1137 memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1138 inlen -= length;
1139
1140 i = 1;
1141 page_base = rqstp->rq_arg.page_base;
1142 while (inlen) {
1143 length = min_t(unsigned int, inlen, PAGE_SIZE);
1144 memcpy(page_address(in_token->pages[i]),
1145 page_address(rqstp->rq_arg.pages[i]) + page_base,
1146 length);
1147
1148 inlen -= length;
1149 page_base = 0;
1150 i++;
1151 }
Simo Sorce030d7942012-05-25 18:09:56 -04001152 return 0;
1153}
1154
Simo Sorcefc2952a2012-04-17 09:39:06 -04001155static inline int
1156gss_write_resv(struct kvec *resv, size_t size_limit,
1157 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1158 int major_status, int minor_status)
1159{
1160 if (resv->iov_len + 4 > size_limit)
1161 return -1;
1162 svc_putnl(resv, RPC_SUCCESS);
1163 if (svc_safe_putnetobj(resv, out_handle))
1164 return -1;
1165 if (resv->iov_len + 3 * 4 > size_limit)
1166 return -1;
1167 svc_putnl(resv, major_status);
1168 svc_putnl(resv, minor_status);
1169 svc_putnl(resv, GSS_SEQ_WIN);
1170 if (svc_safe_putnetobj(resv, out_token))
1171 return -1;
1172 return 0;
1173}
1174
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175/*
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001176 * Having read the cred already and found we're in the context
1177 * initiation case, read the verifier and initiate (or check the results
1178 * of) upcalls to userspace for help with context initiation. If
1179 * the upcall results are available, write the verifier and result.
1180 * Otherwise, drop the request pending an answer to the upcall.
1181 */
Simo Sorce030d7942012-05-25 18:09:56 -04001182static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001183 struct rpc_gss_wire_cred *gc, __be32 *authp)
1184{
1185 struct kvec *argv = &rqstp->rq_arg.head[0];
1186 struct kvec *resv = &rqstp->rq_res.head[0];
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001187 struct rsi *rsip, rsikey;
J. Bruce Fields980e5a42007-12-12 18:21:17 -05001188 int ret;
Vasily Averinb8be5672018-12-24 14:44:42 +03001189 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001190
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001191 memset(&rsikey, 0, sizeof(rsikey));
Simo Sorcefc2952a2012-04-17 09:39:06 -04001192 ret = gss_read_verf(gc, argv, authp,
1193 &rsikey.in_handle, &rsikey.in_token);
1194 if (ret)
1195 return ret;
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001196
1197 /* Perform upcall, or find upcall result: */
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001198 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001199 rsi_free(&rsikey);
1200 if (!rsip)
NeilBrown1ebede82010-08-12 17:04:07 +10001201 return SVC_CLOSE;
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001202 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001203 /* No upcall result: */
NeilBrown1ebede82010-08-12 17:04:07 +10001204 return SVC_CLOSE;
NeilBrown2ed52822010-08-12 17:04:07 +10001205
1206 ret = SVC_CLOSE;
1207 /* Got an answer to the upcall; use it: */
Simo Sorcefc2952a2012-04-17 09:39:06 -04001208 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1209 &rsip->out_handle, &rsip->major_status))
NeilBrown2ed52822010-08-12 17:04:07 +10001210 goto out;
Simo Sorcefc2952a2012-04-17 09:39:06 -04001211 if (gss_write_resv(resv, PAGE_SIZE,
1212 &rsip->out_handle, &rsip->out_token,
1213 rsip->major_status, rsip->minor_status))
NeilBrown2ed52822010-08-12 17:04:07 +10001214 goto out;
1215
J. Bruce Fields980e5a42007-12-12 18:21:17 -05001216 ret = SVC_COMPLETE;
1217out:
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001218 cache_put(&rsip->h, sn->rsi_cache);
J. Bruce Fields980e5a42007-12-12 18:21:17 -05001219 return ret;
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001220}
1221
Simo Sorce030d7942012-05-25 18:09:56 -04001222static int gss_proxy_save_rsc(struct cache_detail *cd,
1223 struct gssp_upcall_data *ud,
1224 uint64_t *handle)
1225{
1226 struct rsc rsci, *rscp = NULL;
1227 static atomic64_t ctxhctr;
1228 long long ctxh;
1229 struct gss_api_mech *gm = NULL;
Arnd Bergmann294ec5b2018-06-07 17:02:50 +02001230 time64_t expiry;
Simo Sorce030d7942012-05-25 18:09:56 -04001231 int status = -EINVAL;
1232
1233 memset(&rsci, 0, sizeof(rsci));
1234 /* context handle */
1235 status = -ENOMEM;
1236 /* the handle needs to be just a unique id,
1237 * use a static counter */
1238 ctxh = atomic64_inc_return(&ctxhctr);
1239
1240 /* make a copy for the caller */
1241 *handle = ctxh;
1242
1243 /* make a copy for the rsc cache */
1244 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1245 goto out;
1246 rscp = rsc_lookup(cd, &rsci);
1247 if (!rscp)
1248 goto out;
1249
1250 /* creds */
1251 if (!ud->found_creds) {
1252 /* userspace seem buggy, we should always get at least a
1253 * mapping to nobody */
J. Bruce Fields3be34552013-10-08 15:53:07 -04001254 goto out;
Simo Sorce030d7942012-05-25 18:09:56 -04001255 } else {
Roberto Bergantinos Corpas3d962082020-02-04 11:32:56 +01001256 struct timespec64 boot;
Simo Sorce030d7942012-05-25 18:09:56 -04001257
1258 /* steal creds */
1259 rsci.cred = ud->creds;
1260 memset(&ud->creds, 0, sizeof(struct svc_cred));
1261
1262 status = -EOPNOTSUPP;
1263 /* get mech handle from OID */
1264 gm = gss_mech_get_by_OID(&ud->mech_oid);
1265 if (!gm)
1266 goto out;
J. Bruce Fields7193bd12013-07-31 17:51:42 -04001267 rsci.cred.cr_gss_mech = gm;
Simo Sorce030d7942012-05-25 18:09:56 -04001268
1269 status = -EINVAL;
1270 /* mech-specific data: */
1271 status = gss_import_sec_context(ud->out_handle.data,
1272 ud->out_handle.len,
1273 gm, &rsci.mechctx,
1274 &expiry, GFP_KERNEL);
1275 if (status)
1276 goto out;
Roberto Bergantinos Corpas3d962082020-02-04 11:32:56 +01001277
1278 getboottime64(&boot);
1279 expiry -= boot.tv_sec;
Simo Sorce030d7942012-05-25 18:09:56 -04001280 }
1281
1282 rsci.h.expiry_time = expiry;
1283 rscp = rsc_update(cd, &rsci, rscp);
1284 status = 0;
1285out:
Simo Sorce030d7942012-05-25 18:09:56 -04001286 rsc_free(&rsci);
1287 if (rscp)
1288 cache_put(&rscp->h, cd);
1289 else
1290 status = -ENOMEM;
1291 return status;
1292}
1293
1294static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1295 struct rpc_gss_wire_cred *gc, __be32 *authp)
1296{
1297 struct kvec *resv = &rqstp->rq_res.head[0];
1298 struct xdr_netobj cli_handle;
1299 struct gssp_upcall_data ud;
1300 uint64_t handle;
1301 int status;
1302 int ret;
Vasily Averinb8be5672018-12-24 14:44:42 +03001303 struct net *net = SVC_NET(rqstp);
Simo Sorce030d7942012-05-25 18:09:56 -04001304 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1305
1306 memset(&ud, 0, sizeof(ud));
1307 ret = gss_read_proxy_verf(rqstp, gc, authp,
1308 &ud.in_handle, &ud.in_token);
1309 if (ret)
1310 return ret;
1311
1312 ret = SVC_CLOSE;
1313
1314 /* Perform synchronous upcall to gss-proxy */
1315 status = gssp_accept_sec_context_upcall(net, &ud);
1316 if (status)
1317 goto out;
1318
Chuck Lever28155522020-03-02 15:16:06 -05001319 trace_rpcgss_svc_accept_upcall(rqstp->rq_xid, ud.major_status,
1320 ud.minor_status);
Simo Sorce030d7942012-05-25 18:09:56 -04001321
1322 switch (ud.major_status) {
1323 case GSS_S_CONTINUE_NEEDED:
1324 cli_handle = ud.out_handle;
1325 break;
1326 case GSS_S_COMPLETE:
1327 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
Chuck Lever28155522020-03-02 15:16:06 -05001328 if (status)
Simo Sorce030d7942012-05-25 18:09:56 -04001329 goto out;
1330 cli_handle.data = (u8 *)&handle;
1331 cli_handle.len = sizeof(handle);
1332 break;
1333 default:
Simo Sorce030d7942012-05-25 18:09:56 -04001334 goto out;
1335 }
1336
1337 /* Got an answer to the upcall; use it: */
1338 if (gss_write_init_verf(sn->rsc_cache, rqstp,
Chuck Lever28155522020-03-02 15:16:06 -05001339 &cli_handle, &ud.major_status))
Simo Sorce030d7942012-05-25 18:09:56 -04001340 goto out;
1341 if (gss_write_resv(resv, PAGE_SIZE,
1342 &cli_handle, &ud.out_token,
Chuck Lever28155522020-03-02 15:16:06 -05001343 ud.major_status, ud.minor_status))
Simo Sorce030d7942012-05-25 18:09:56 -04001344 goto out;
1345
1346 ret = SVC_COMPLETE;
1347out:
Chuck Lever5866efa2019-10-24 09:34:16 -04001348 gss_free_in_token_pages(&ud.in_token);
Simo Sorce030d7942012-05-25 18:09:56 -04001349 gssp_free_upcall_data(&ud);
1350 return ret;
1351}
1352
Jeff Layton0fdc2672014-01-04 07:18:05 -05001353/*
1354 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1355 * it to be changed if it's currently undefined (-1). If it's any other value
1356 * then return -EBUSY unless the type wouldn't have changed anyway.
1357 */
1358static int set_gss_proxy(struct net *net, int type)
1359{
1360 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1361 int ret;
1362
1363 WARN_ON_ONCE(type != 0 && type != 1);
1364 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1365 if (ret != -1 && ret != type)
1366 return -EBUSY;
1367 return 0;
1368}
Simo Sorce030d7942012-05-25 18:09:56 -04001369
1370static bool use_gss_proxy(struct net *net)
1371{
1372 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1373
Jeff Layton0fdc2672014-01-04 07:18:05 -05001374 /* If use_gss_proxy is still undefined, then try to disable it */
1375 if (sn->use_gss_proxy == -1)
1376 set_gss_proxy(net, 0);
1377 return sn->use_gss_proxy;
Simo Sorce030d7942012-05-25 18:09:56 -04001378}
1379
J. Bruce Fields0ff3bab2013-04-29 17:03:31 -04001380#ifdef CONFIG_PROC_FS
1381
Simo Sorce030d7942012-05-25 18:09:56 -04001382static ssize_t write_gssp(struct file *file, const char __user *buf,
1383 size_t count, loff_t *ppos)
1384{
Al Viroe77e4302013-06-16 17:25:12 +04001385 struct net *net = PDE_DATA(file_inode(file));
Simo Sorce030d7942012-05-25 18:09:56 -04001386 char tbuf[20];
1387 unsigned long i;
1388 int res;
1389
1390 if (*ppos || count > sizeof(tbuf)-1)
1391 return -EINVAL;
1392 if (copy_from_user(tbuf, buf, count))
1393 return -EFAULT;
1394
1395 tbuf[count] = 0;
1396 res = kstrtoul(tbuf, 0, &i);
1397 if (res)
1398 return res;
1399 if (i != 1)
1400 return -EINVAL;
Jeff Laytona92e5eb2014-01-04 07:18:04 -05001401 res = set_gssp_clnt(net);
Simo Sorce030d7942012-05-25 18:09:56 -04001402 if (res)
1403 return res;
Jeff Laytona92e5eb2014-01-04 07:18:04 -05001404 res = set_gss_proxy(net, 1);
Simo Sorce030d7942012-05-25 18:09:56 -04001405 if (res)
1406 return res;
1407 return count;
1408}
1409
1410static ssize_t read_gssp(struct file *file, char __user *buf,
1411 size_t count, loff_t *ppos)
1412{
Al Viroe77e4302013-06-16 17:25:12 +04001413 struct net *net = PDE_DATA(file_inode(file));
Jeff Layton1654a042014-01-04 07:18:03 -05001414 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Simo Sorce030d7942012-05-25 18:09:56 -04001415 unsigned long p = *ppos;
1416 char tbuf[10];
1417 size_t len;
Simo Sorce030d7942012-05-25 18:09:56 -04001418
Jeff Layton1654a042014-01-04 07:18:03 -05001419 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
Simo Sorce030d7942012-05-25 18:09:56 -04001420 len = strlen(tbuf);
1421 if (p >= len)
1422 return 0;
1423 len -= p;
1424 if (len > count)
1425 len = count;
1426 if (copy_to_user(buf, (void *)(tbuf+p), len))
1427 return -EFAULT;
1428 *ppos += len;
1429 return len;
1430}
1431
Alexey Dobriyan97a32532020-02-03 17:37:17 -08001432static const struct proc_ops use_gss_proxy_proc_ops = {
1433 .proc_open = nonseekable_open,
1434 .proc_write = write_gssp,
1435 .proc_read = read_gssp,
Simo Sorce030d7942012-05-25 18:09:56 -04001436};
1437
1438static int create_use_gss_proxy_proc_entry(struct net *net)
1439{
1440 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1441 struct proc_dir_entry **p = &sn->use_gssp_proc;
1442
1443 sn->use_gss_proxy = -1;
Joe Perchesd6444062018-03-23 15:54:38 -07001444 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
Simo Sorce030d7942012-05-25 18:09:56 -04001445 sn->proc_net_rpc,
Alexey Dobriyan97a32532020-02-03 17:37:17 -08001446 &use_gss_proxy_proc_ops, net);
Simo Sorce030d7942012-05-25 18:09:56 -04001447 if (!*p)
1448 return -ENOMEM;
1449 init_gssp_clnt(sn);
1450 return 0;
1451}
1452
1453static void destroy_use_gss_proxy_proc_entry(struct net *net)
1454{
1455 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1456
1457 if (sn->use_gssp_proc) {
Stephen Hemminger8fdee4c2018-07-24 12:29:15 -07001458 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
Simo Sorce030d7942012-05-25 18:09:56 -04001459 clear_gssp_clnt(sn);
1460 }
1461}
J. Bruce Fields0ff3bab2013-04-29 17:03:31 -04001462#else /* CONFIG_PROC_FS */
1463
1464static int create_use_gss_proxy_proc_entry(struct net *net)
1465{
1466 return 0;
1467}
1468
1469static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
Simo Sorce030d7942012-05-25 18:09:56 -04001470
1471#endif /* CONFIG_PROC_FS */
1472
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001473/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 * Accept an rpcsec packet.
1475 * If context establishment, punt to user space
1476 * If data exchange, verify/decrypt
1477 * If context destruction, handle here
1478 * In the context establishment and destruction case we encode
1479 * response here and return SVC_COMPLETE.
1480 */
1481static int
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001482svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
1484 struct kvec *argv = &rqstp->rq_arg.head[0];
1485 struct kvec *resv = &rqstp->rq_res.head[0];
1486 u32 crlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1488 struct rpc_gss_wire_cred *gc;
1489 struct rsc *rsci = NULL;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001490 __be32 *rpcstart;
1491 __be32 *reject_stat = resv->iov_base + resv->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 int ret;
Vasily Averinb8be5672018-12-24 14:44:42 +03001493 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494
Chuck Lever28155522020-03-02 15:16:06 -05001495 trace_rpcgss_svc_accept(rqstp->rq_xid, argv->iov_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496
1497 *authp = rpc_autherr_badcred;
1498 if (!svcdata)
1499 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1500 if (!svcdata)
1501 goto auth_err;
1502 rqstp->rq_auth_data = svcdata;
J.Bruce Fields5b304bc2006-10-04 02:16:07 -07001503 svcdata->verf_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 svcdata->rsci = NULL;
1505 gc = &svcdata->clcred;
1506
1507 /* start of rpc packet is 7 u32's back from here:
1508 * xid direction rpcversion prog vers proc flavour
1509 */
1510 rpcstart = argv->iov_base;
1511 rpcstart -= 7;
1512
1513 /* credential is:
1514 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001515 * at least 5 u32s, and is preceded by length, so that makes 6.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 */
1517
1518 if (argv->iov_len < 5 * 4)
1519 goto auth_err;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001520 crlen = svc_getnl(argv);
1521 if (svc_getnl(argv) != RPC_GSS_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 goto auth_err;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001523 gc->gc_proc = svc_getnl(argv);
1524 gc->gc_seq = svc_getnl(argv);
1525 gc->gc_svc = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1527 goto auth_err;
1528 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1529 goto auth_err;
1530
1531 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1532 goto auth_err;
1533
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 *authp = rpc_autherr_badverf;
1535 switch (gc->gc_proc) {
1536 case RPC_GSS_PROC_INIT:
1537 case RPC_GSS_PROC_CONTINUE_INIT:
Simo Sorce030d7942012-05-25 18:09:56 -04001538 if (use_gss_proxy(SVC_NET(rqstp)))
1539 return svcauth_gss_proxy_init(rqstp, gc, authp);
1540 else
1541 return svcauth_gss_legacy_init(rqstp, gc, authp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 case RPC_GSS_PROC_DATA:
1543 case RPC_GSS_PROC_DESTROY:
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001544 /* Look up the context, and check the verifier: */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 *authp = rpcsec_gsserr_credproblem;
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001546 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 if (!rsci)
1548 goto auth_err;
1549 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
1550 case SVC_OK:
1551 break;
1552 case SVC_DENIED:
1553 goto auth_err;
1554 case SVC_DROP:
1555 goto drop;
1556 }
1557 break;
1558 default:
1559 *authp = rpc_autherr_rejectedcred;
1560 goto auth_err;
1561 }
1562
1563 /* now act upon the command: */
1564 switch (gc->gc_proc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 case RPC_GSS_PROC_DESTROY:
Wei Yongjunc5e434c982007-05-09 02:34:54 -07001566 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1567 goto auth_err;
Neil Brown2b477c02016-12-22 12:38:06 -05001568 /* Delete the entry from the cache_list and call cache_put */
1569 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 if (resv->iov_len + 4 > PAGE_SIZE)
1571 goto drop;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001572 svc_putnl(resv, RPC_SUCCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 goto complete;
1574 case RPC_GSS_PROC_DATA:
1575 *authp = rpcsec_gsserr_ctxproblem;
J.Bruce Fields5b304bc2006-10-04 02:16:07 -07001576 svcdata->verf_start = resv->iov_base + resv->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1578 goto auth_err;
1579 rqstp->rq_cred = rsci->cred;
1580 get_group_info(rsci->cred.cr_group_info);
1581 *authp = rpc_autherr_badcred;
1582 switch (gc->gc_svc) {
1583 case RPC_GSS_SVC_NONE:
1584 break;
1585 case RPC_GSS_SVC_INTEGRITY:
J. Bruce Fieldsb6207542008-07-03 15:26:35 -04001586 /* placeholders for length and seq. number: */
1587 svc_putnl(resv, 0);
1588 svc_putnl(resv, 0);
Jeff Layton4c190e22013-02-06 08:28:55 -05001589 if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 gc->gc_seq, rsci->mechctx))
Harshula Jayasuriyadd35210e2008-02-20 10:56:56 +11001591 goto garbage_args;
J. Bruce Fieldsa5cddc82014-05-12 18:10:58 -04001592 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
J. Bruce Fieldsb6207542008-07-03 15:26:35 -04001593 break;
1594 case RPC_GSS_SVC_PRIVACY:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 /* placeholders for length and seq. number: */
Alexey Dobriyan76994312006-09-26 22:28:46 -07001596 svc_putnl(resv, 0);
1597 svc_putnl(resv, 0);
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001598 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1599 gc->gc_seq, rsci->mechctx))
Harshula Jayasuriyadd35210e2008-02-20 10:56:56 +11001600 goto garbage_args;
J. Bruce Fieldsa5cddc82014-05-12 18:10:58 -04001601 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001602 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 default:
1604 goto auth_err;
1605 }
1606 svcdata->rsci = rsci;
1607 cache_get(&rsci->h);
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -04001608 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
Chuck Lever83523d02013-03-16 15:55:01 -04001609 rsci->mechctx->mech_type,
1610 GSS_C_QOP_DEFAULT,
1611 gc->gc_svc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 ret = SVC_OK;
1613 goto out;
1614 }
Harshula Jayasuriyadd35210e2008-02-20 10:56:56 +11001615garbage_args:
Harshula Jayasuriyadd35210e2008-02-20 10:56:56 +11001616 ret = SVC_GARBAGE;
1617 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618auth_err:
J. Bruce Fields21fcd022007-08-09 20:16:22 -04001619 /* Restore write pointer to its original value: */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 xdr_ressize_check(rqstp, reject_stat);
1621 ret = SVC_DENIED;
1622 goto out;
1623complete:
1624 ret = SVC_COMPLETE;
1625 goto out;
1626drop:
Chuck Lever4d712ef2016-11-29 11:04:34 -05001627 ret = SVC_CLOSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628out:
1629 if (rsci)
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001630 cache_put(&rsci->h, sn->rsc_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 return ret;
1632}
1633
Al Virocfbdbab2006-10-10 22:49:27 +01001634static __be32 *
J.Bruce Fields3c15a482006-10-04 02:16:06 -07001635svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1636{
Al Virocfbdbab2006-10-10 22:49:27 +01001637 __be32 *p;
1638 u32 verf_len;
J.Bruce Fields3c15a482006-10-04 02:16:06 -07001639
J.Bruce Fields5b304bc2006-10-04 02:16:07 -07001640 p = gsd->verf_start;
1641 gsd->verf_start = NULL;
1642
1643 /* If the reply stat is nonzero, don't wrap: */
1644 if (*(p-1) != rpc_success)
1645 return NULL;
1646 /* Skip the verifier: */
1647 p += 1;
1648 verf_len = ntohl(*p++);
1649 p += XDR_QUADLEN(verf_len);
J.Bruce Fields3c15a482006-10-04 02:16:06 -07001650 /* move accept_stat to right place: */
1651 memcpy(p, p + 2, 4);
J.Bruce Fields5b304bc2006-10-04 02:16:07 -07001652 /* Also don't wrap if the accept stat is nonzero: */
J.Bruce Fields3c15a482006-10-04 02:16:06 -07001653 if (*p != rpc_success) {
1654 resbuf->head[0].iov_len -= 2 * 4;
1655 return NULL;
1656 }
1657 p++;
1658 return p;
1659}
1660
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001661static inline int
1662svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663{
1664 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1665 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1666 struct xdr_buf *resbuf = &rqstp->rq_res;
1667 struct xdr_buf integ_buf;
1668 struct xdr_netobj mic;
1669 struct kvec *resv;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001670 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 int integ_offset, integ_len;
1672 int stat = -EINVAL;
1673
J.Bruce Fields3c15a482006-10-04 02:16:06 -07001674 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1675 if (p == NULL)
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001676 goto out;
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001677 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1678 integ_len = resbuf->len - integ_offset;
Chuck Lever96f194b2020-03-02 15:01:08 -05001679 if (integ_len & 3)
1680 goto out;
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001681 *p++ = htonl(integ_len);
1682 *p++ = htonl(gc->gc_seq);
J. Bruce Fields1754eb22017-10-24 14:58:11 -04001683 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1684 WARN_ON_ONCE(1);
1685 goto out_err;
1686 }
NeilBrown153e44d2007-05-09 02:34:52 -07001687 if (resbuf->tail[0].iov_base == NULL) {
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001688 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1689 goto out_err;
1690 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1691 + resbuf->head[0].iov_len;
1692 resbuf->tail[0].iov_len = 0;
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001693 }
J. Bruce Fieldsbba0f882013-01-18 11:33:08 -05001694 resv = &resbuf->tail[0];
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001695 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1696 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1697 goto out_err;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001698 svc_putnl(resv, mic.len);
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001699 memset(mic.data + mic.len, 0,
1700 round_up_to_quad(mic.len) - mic.len);
1701 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1702 /* not strictly required: */
1703 resbuf->len += XDR_QUADLEN(mic.len) << 2;
Chuck Lever28155522020-03-02 15:16:06 -05001704 if (resv->iov_len > PAGE_SIZE)
1705 goto out_err;
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001706out:
1707 stat = 0;
1708out_err:
1709 return stat;
1710}
1711
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001712static inline int
1713svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1714{
1715 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1716 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1717 struct xdr_buf *resbuf = &rqstp->rq_res;
1718 struct page **inpages = NULL;
Al Viro753ed902006-09-26 22:30:23 -07001719 __be32 *p, *len;
1720 int offset;
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001721 int pad;
1722
J.Bruce Fields3c15a482006-10-04 02:16:06 -07001723 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1724 if (p == NULL)
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001725 return 0;
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001726 len = p++;
1727 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1728 *p++ = htonl(gc->gc_seq);
1729 inpages = resbuf->pages;
1730 /* XXX: Would be better to write some xdr helper functions for
1731 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
Kevin Coffman75610422010-03-17 13:02:47 -04001732
1733 /*
1734 * If there is currently tail data, make sure there is
1735 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1736 * the page, and move the current tail data such that
1737 * there is RPC_MAX_AUTH_SIZE slack space available in
1738 * both the head and tail.
1739 */
NeilBrown44524352006-10-04 02:15:46 -07001740 if (resbuf->tail[0].iov_base) {
Chuck Lever28155522020-03-02 15:16:06 -05001741 if (resbuf->tail[0].iov_base >=
1742 resbuf->head[0].iov_base + PAGE_SIZE)
1743 return -EINVAL;
1744 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base)
1745 return -EINVAL;
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001746 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1747 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1748 return -ENOMEM;
1749 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1750 resbuf->tail[0].iov_base,
1751 resbuf->tail[0].iov_len);
1752 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1753 }
Kevin Coffman75610422010-03-17 13:02:47 -04001754 /*
1755 * If there is no current tail data, make sure there is
1756 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1757 * allotted page, and set up tail information such that there
1758 * is RPC_MAX_AUTH_SIZE slack space available in both the
1759 * head and tail.
1760 */
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001761 if (resbuf->tail[0].iov_base == NULL) {
1762 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1763 return -ENOMEM;
1764 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1765 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1766 resbuf->tail[0].iov_len = 0;
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001767 }
1768 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1769 return -ENOMEM;
1770 *len = htonl(resbuf->len - offset);
1771 pad = 3 - ((resbuf->len - offset - 1)&3);
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001772 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001773 memset(p, 0, pad);
1774 resbuf->tail[0].iov_len += pad;
1775 resbuf->len += pad;
1776 return 0;
1777}
1778
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001779static int
1780svcauth_gss_release(struct svc_rqst *rqstp)
1781{
1782 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1783 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1784 struct xdr_buf *resbuf = &rqstp->rq_res;
1785 int stat = -EINVAL;
Vasily Averinb8be5672018-12-24 14:44:42 +03001786 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
J. Bruce Fieldse142ede2006-06-30 01:56:18 -07001787
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1789 goto out;
1790 /* Release can be called twice, but we only wrap once. */
J.Bruce Fields5b304bc2006-10-04 02:16:07 -07001791 if (gsd->verf_start == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 goto out;
1793 /* normally not set till svc_send, but we need it here: */
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001794 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1795 * or whatever? */
1796 resbuf->len = total_buf_len(resbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 switch (gc->gc_svc) {
1798 case RPC_GSS_SVC_NONE:
1799 break;
1800 case RPC_GSS_SVC_INTEGRITY:
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001801 stat = svcauth_gss_wrap_resp_integ(rqstp);
1802 if (stat)
1803 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 break;
1805 case RPC_GSS_SVC_PRIVACY:
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001806 stat = svcauth_gss_wrap_resp_priv(rqstp);
1807 if (stat)
1808 goto out_err;
1809 break;
Wei Yongjuneac817362009-08-04 17:27:52 +08001810 /*
1811 * For any other gc_svc value, svcauth_gss_accept() already set
1812 * the auth_error appropriately; just fall through:
1813 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814 }
1815
1816out:
1817 stat = 0;
1818out_err:
1819 if (rqstp->rq_client)
1820 auth_domain_put(rqstp->rq_client);
1821 rqstp->rq_client = NULL;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001822 if (rqstp->rq_gssclient)
1823 auth_domain_put(rqstp->rq_gssclient);
1824 rqstp->rq_gssclient = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 if (rqstp->rq_cred.cr_group_info)
1826 put_group_info(rqstp->rq_cred.cr_group_info);
1827 rqstp->rq_cred.cr_group_info = NULL;
1828 if (gsd->rsci)
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001829 cache_put(&gsd->rsci->h, sn->rsc_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 gsd->rsci = NULL;
1831
1832 return stat;
1833}
1834
1835static void
Trond Myklebust608a0ab2018-10-01 10:41:44 -04001836svcauth_gss_domain_release_rcu(struct rcu_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837{
Trond Myklebust608a0ab2018-10-01 10:41:44 -04001838 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1840
1841 kfree(dom->name);
1842 kfree(gd);
1843}
1844
Trond Myklebust608a0ab2018-10-01 10:41:44 -04001845static void
1846svcauth_gss_domain_release(struct auth_domain *dom)
1847{
1848 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1849}
1850
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851static struct auth_ops svcauthops_gss = {
1852 .name = "rpcsec_gss",
1853 .owner = THIS_MODULE,
1854 .flavour = RPC_AUTH_GSS,
1855 .accept = svcauth_gss_accept,
1856 .release = svcauth_gss_release,
1857 .domain_release = svcauth_gss_domain_release,
1858 .set_client = svcauth_gss_set_client,
1859};
1860
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001861static int rsi_cache_create_net(struct net *net)
1862{
1863 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1864 struct cache_detail *cd;
1865 int err;
1866
1867 cd = cache_create_net(&rsi_cache_template, net);
1868 if (IS_ERR(cd))
1869 return PTR_ERR(cd);
1870 err = cache_register_net(cd, net);
1871 if (err) {
1872 cache_destroy_net(cd, net);
1873 return err;
1874 }
1875 sn->rsi_cache = cd;
1876 return 0;
1877}
1878
1879static void rsi_cache_destroy_net(struct net *net)
1880{
1881 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1882 struct cache_detail *cd = sn->rsi_cache;
1883
1884 sn->rsi_cache = NULL;
1885 cache_purge(cd);
1886 cache_unregister_net(cd, net);
1887 cache_destroy_net(cd, net);
1888}
1889
1890static int rsc_cache_create_net(struct net *net)
1891{
1892 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1893 struct cache_detail *cd;
1894 int err;
1895
1896 cd = cache_create_net(&rsc_cache_template, net);
1897 if (IS_ERR(cd))
1898 return PTR_ERR(cd);
1899 err = cache_register_net(cd, net);
1900 if (err) {
1901 cache_destroy_net(cd, net);
1902 return err;
1903 }
1904 sn->rsc_cache = cd;
1905 return 0;
1906}
1907
1908static void rsc_cache_destroy_net(struct net *net)
1909{
1910 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1911 struct cache_detail *cd = sn->rsc_cache;
1912
1913 sn->rsc_cache = NULL;
1914 cache_purge(cd);
1915 cache_unregister_net(cd, net);
1916 cache_destroy_net(cd, net);
1917}
1918
1919int
1920gss_svc_init_net(struct net *net)
1921{
1922 int rv;
1923
1924 rv = rsc_cache_create_net(net);
1925 if (rv)
1926 return rv;
1927 rv = rsi_cache_create_net(net);
1928 if (rv)
1929 goto out1;
Simo Sorce030d7942012-05-25 18:09:56 -04001930 rv = create_use_gss_proxy_proc_entry(net);
1931 if (rv)
1932 goto out2;
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001933 return 0;
Simo Sorce030d7942012-05-25 18:09:56 -04001934out2:
1935 destroy_use_gss_proxy_proc_entry(net);
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001936out1:
1937 rsc_cache_destroy_net(net);
1938 return rv;
1939}
1940
1941void
1942gss_svc_shutdown_net(struct net *net)
1943{
Simo Sorce030d7942012-05-25 18:09:56 -04001944 destroy_use_gss_proxy_proc_entry(net);
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001945 rsi_cache_destroy_net(net);
1946 rsc_cache_destroy_net(net);
1947}
1948
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949int
1950gss_svc_init(void)
1951{
Stanislav Kinsburskya1db4102012-01-19 21:42:37 +04001952 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953}
1954
1955void
1956gss_svc_shutdown(void)
1957{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958 svc_auth_unregister(RPC_AUTH_GSS);
1959}