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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Neil Brown <neilb@cse.unsw.edu.au> | |
3 | * J. Bruce Fields <bfields@umich.edu> | |
4 | * Andy Adamson <andros@umich.edu> | |
5 | * Dug Song <dugsong@monkey.org> | |
6 | * | |
7 | * RPCSEC_GSS server authentication. | |
8 | * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 | |
9 | * (gssapi) | |
10 | * | |
11 | * The RPCSEC_GSS involves three stages: | |
12 | * 1/ context creation | |
13 | * 2/ data exchange | |
14 | * 3/ context destruction | |
15 | * | |
16 | * Context creation is handled largely by upcalls to user-space. | |
17 | * In particular, GSS_Accept_sec_context is handled by an upcall | |
18 | * Data exchange is handled entirely within the kernel | |
19 | * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. | |
20 | * Context destruction is handled in-kernel | |
21 | * GSS_Delete_sec_context is in-kernel | |
22 | * | |
23 | * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. | |
24 | * The context handle and gss_token are used as a key into the rpcsec_init cache. | |
25 | * The content of this cache includes some of the outputs of GSS_Accept_sec_context, | |
26 | * being major_status, minor_status, context_handle, reply_token. | |
27 | * These are sent back to the client. | |
28 | * Sequence window management is handled by the kernel. The window size if currently | |
29 | * a compile time constant. | |
30 | * | |
31 | * When user-space is happy that a context is established, it places an entry | |
32 | * in the rpcsec_context cache. The key for this cache is the context_handle. | |
33 | * The content includes: | |
34 | * uid/gidlist - for determining access rights | |
35 | * mechanism type | |
36 | * mechanism specific information, such as a key | |
37 | * | |
38 | */ | |
39 | ||
40 | #include <linux/types.h> | |
41 | #include <linux/module.h> | |
42 | #include <linux/pagemap.h> | |
43 | ||
44 | #include <linux/sunrpc/auth_gss.h> | |
45 | #include <linux/sunrpc/svcauth.h> | |
46 | #include <linux/sunrpc/gss_err.h> | |
47 | #include <linux/sunrpc/svcauth.h> | |
48 | #include <linux/sunrpc/svcauth_gss.h> | |
49 | #include <linux/sunrpc/cache.h> | |
50 | ||
51 | #ifdef RPC_DEBUG | |
52 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
53 | #endif | |
54 | ||
55 | /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests | |
56 | * into replies. | |
57 | * | |
58 | * Key is context handle (\x if empty) and gss_token. | |
59 | * Content is major_status minor_status (integers) context_handle, reply_token. | |
60 | * | |
61 | */ | |
62 | ||
63 | static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) | |
64 | { | |
65 | return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); | |
66 | } | |
67 | ||
68 | #define RSI_HASHBITS 6 | |
69 | #define RSI_HASHMAX (1<<RSI_HASHBITS) | |
70 | #define RSI_HASHMASK (RSI_HASHMAX-1) | |
71 | ||
72 | struct rsi { | |
73 | struct cache_head h; | |
74 | struct xdr_netobj in_handle, in_token; | |
75 | struct xdr_netobj out_handle, out_token; | |
76 | int major_status, minor_status; | |
77 | }; | |
78 | ||
79 | static struct cache_head *rsi_table[RSI_HASHMAX]; | |
80 | static struct cache_detail rsi_cache; | |
d4d11ea9 N |
81 | static struct rsi *rsi_update(struct rsi *new, struct rsi *old); |
82 | static struct rsi *rsi_lookup(struct rsi *item); | |
1da177e4 LT |
83 | |
84 | static void rsi_free(struct rsi *rsii) | |
85 | { | |
86 | kfree(rsii->in_handle.data); | |
87 | kfree(rsii->in_token.data); | |
88 | kfree(rsii->out_handle.data); | |
89 | kfree(rsii->out_token.data); | |
90 | } | |
91 | ||
baab935f | 92 | static void rsi_put(struct kref *ref) |
1da177e4 | 93 | { |
baab935f N |
94 | struct rsi *rsii = container_of(ref, struct rsi, h.ref); |
95 | rsi_free(rsii); | |
96 | kfree(rsii); | |
1da177e4 LT |
97 | } |
98 | ||
99 | static inline int rsi_hash(struct rsi *item) | |
100 | { | |
101 | return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS) | |
102 | ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS); | |
103 | } | |
104 | ||
d4d11ea9 | 105 | static int rsi_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 106 | { |
d4d11ea9 N |
107 | struct rsi *item = container_of(a, struct rsi, h); |
108 | struct rsi *tmp = container_of(b, struct rsi, h); | |
1da177e4 LT |
109 | return netobj_equal(&item->in_handle, &tmp->in_handle) |
110 | && netobj_equal(&item->in_token, &tmp->in_token); | |
111 | } | |
112 | ||
113 | static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) | |
114 | { | |
115 | dst->len = len; | |
116 | dst->data = (len ? kmalloc(len, GFP_KERNEL) : NULL); | |
117 | if (dst->data) | |
118 | memcpy(dst->data, src, len); | |
119 | if (len && !dst->data) | |
120 | return -ENOMEM; | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) | |
125 | { | |
126 | return dup_to_netobj(dst, src->data, src->len); | |
127 | } | |
128 | ||
d4d11ea9 | 129 | static void rsi_init(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 130 | { |
d4d11ea9 N |
131 | struct rsi *new = container_of(cnew, struct rsi, h); |
132 | struct rsi *item = container_of(citem, struct rsi, h); | |
133 | ||
1da177e4 LT |
134 | new->out_handle.data = NULL; |
135 | new->out_handle.len = 0; | |
136 | new->out_token.data = NULL; | |
137 | new->out_token.len = 0; | |
138 | new->in_handle.len = item->in_handle.len; | |
139 | item->in_handle.len = 0; | |
140 | new->in_token.len = item->in_token.len; | |
141 | item->in_token.len = 0; | |
142 | new->in_handle.data = item->in_handle.data; | |
143 | item->in_handle.data = NULL; | |
144 | new->in_token.data = item->in_token.data; | |
145 | item->in_token.data = NULL; | |
146 | } | |
147 | ||
d4d11ea9 | 148 | static void update_rsi(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 149 | { |
d4d11ea9 N |
150 | struct rsi *new = container_of(cnew, struct rsi, h); |
151 | struct rsi *item = container_of(citem, struct rsi, h); | |
152 | ||
1da177e4 LT |
153 | BUG_ON(new->out_handle.data || new->out_token.data); |
154 | new->out_handle.len = item->out_handle.len; | |
155 | item->out_handle.len = 0; | |
156 | new->out_token.len = item->out_token.len; | |
157 | item->out_token.len = 0; | |
158 | new->out_handle.data = item->out_handle.data; | |
159 | item->out_handle.data = NULL; | |
160 | new->out_token.data = item->out_token.data; | |
161 | item->out_token.data = NULL; | |
162 | ||
163 | new->major_status = item->major_status; | |
164 | new->minor_status = item->minor_status; | |
165 | } | |
166 | ||
d4d11ea9 N |
167 | static struct cache_head *rsi_alloc(void) |
168 | { | |
169 | struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); | |
170 | if (rsii) | |
171 | return &rsii->h; | |
172 | else | |
173 | return NULL; | |
174 | } | |
175 | ||
1da177e4 LT |
176 | static void rsi_request(struct cache_detail *cd, |
177 | struct cache_head *h, | |
178 | char **bpp, int *blen) | |
179 | { | |
180 | struct rsi *rsii = container_of(h, struct rsi, h); | |
181 | ||
182 | qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); | |
183 | qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); | |
184 | (*bpp)[-1] = '\n'; | |
185 | } | |
186 | ||
187 | ||
188 | static int rsi_parse(struct cache_detail *cd, | |
189 | char *mesg, int mlen) | |
190 | { | |
191 | /* context token expiry major minor context token */ | |
192 | char *buf = mesg; | |
193 | char *ep; | |
194 | int len; | |
195 | struct rsi rsii, *rsip = NULL; | |
196 | time_t expiry; | |
197 | int status = -EINVAL; | |
198 | ||
199 | memset(&rsii, 0, sizeof(rsii)); | |
200 | /* handle */ | |
201 | len = qword_get(&mesg, buf, mlen); | |
202 | if (len < 0) | |
203 | goto out; | |
204 | status = -ENOMEM; | |
205 | if (dup_to_netobj(&rsii.in_handle, buf, len)) | |
206 | goto out; | |
207 | ||
208 | /* token */ | |
209 | len = qword_get(&mesg, buf, mlen); | |
210 | status = -EINVAL; | |
211 | if (len < 0) | |
212 | goto out; | |
213 | status = -ENOMEM; | |
214 | if (dup_to_netobj(&rsii.in_token, buf, len)) | |
215 | goto out; | |
216 | ||
d4d11ea9 N |
217 | rsip = rsi_lookup(&rsii); |
218 | if (!rsip) | |
219 | goto out; | |
220 | ||
1da177e4 LT |
221 | rsii.h.flags = 0; |
222 | /* expiry */ | |
223 | expiry = get_expiry(&mesg); | |
224 | status = -EINVAL; | |
225 | if (expiry == 0) | |
226 | goto out; | |
227 | ||
228 | /* major/minor */ | |
229 | len = qword_get(&mesg, buf, mlen); | |
230 | if (len < 0) | |
231 | goto out; | |
232 | if (len == 0) { | |
233 | goto out; | |
234 | } else { | |
235 | rsii.major_status = simple_strtoul(buf, &ep, 10); | |
236 | if (*ep) | |
237 | goto out; | |
238 | len = qword_get(&mesg, buf, mlen); | |
239 | if (len <= 0) | |
240 | goto out; | |
241 | rsii.minor_status = simple_strtoul(buf, &ep, 10); | |
242 | if (*ep) | |
243 | goto out; | |
244 | ||
245 | /* out_handle */ | |
246 | len = qword_get(&mesg, buf, mlen); | |
247 | if (len < 0) | |
248 | goto out; | |
249 | status = -ENOMEM; | |
250 | if (dup_to_netobj(&rsii.out_handle, buf, len)) | |
251 | goto out; | |
252 | ||
253 | /* out_token */ | |
254 | len = qword_get(&mesg, buf, mlen); | |
255 | status = -EINVAL; | |
256 | if (len < 0) | |
257 | goto out; | |
258 | status = -ENOMEM; | |
259 | if (dup_to_netobj(&rsii.out_token, buf, len)) | |
260 | goto out; | |
261 | } | |
262 | rsii.h.expiry_time = expiry; | |
d4d11ea9 | 263 | rsip = rsi_update(&rsii, rsip); |
1da177e4 LT |
264 | status = 0; |
265 | out: | |
266 | rsi_free(&rsii); | |
267 | if (rsip) | |
baab935f | 268 | cache_put(&rsip->h, &rsi_cache); |
d4d11ea9 N |
269 | else |
270 | status = -ENOMEM; | |
1da177e4 LT |
271 | return status; |
272 | } | |
273 | ||
274 | static struct cache_detail rsi_cache = { | |
f35279d3 | 275 | .owner = THIS_MODULE, |
1da177e4 LT |
276 | .hash_size = RSI_HASHMAX, |
277 | .hash_table = rsi_table, | |
278 | .name = "auth.rpcsec.init", | |
279 | .cache_put = rsi_put, | |
280 | .cache_request = rsi_request, | |
281 | .cache_parse = rsi_parse, | |
d4d11ea9 N |
282 | .match = rsi_match, |
283 | .init = rsi_init, | |
284 | .update = update_rsi, | |
285 | .alloc = rsi_alloc, | |
1da177e4 LT |
286 | }; |
287 | ||
d4d11ea9 N |
288 | static struct rsi *rsi_lookup(struct rsi *item) |
289 | { | |
290 | struct cache_head *ch; | |
291 | int hash = rsi_hash(item); | |
292 | ||
293 | ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); | |
294 | if (ch) | |
295 | return container_of(ch, struct rsi, h); | |
296 | else | |
297 | return NULL; | |
298 | } | |
299 | ||
300 | static struct rsi *rsi_update(struct rsi *new, struct rsi *old) | |
301 | { | |
302 | struct cache_head *ch; | |
303 | int hash = rsi_hash(new); | |
304 | ||
305 | ch = sunrpc_cache_update(&rsi_cache, &new->h, | |
306 | &old->h, hash); | |
307 | if (ch) | |
308 | return container_of(ch, struct rsi, h); | |
309 | else | |
310 | return NULL; | |
311 | } | |
312 | ||
1da177e4 LT |
313 | |
314 | /* | |
315 | * The rpcsec_context cache is used to store a context that is | |
316 | * used in data exchange. | |
317 | * The key is a context handle. The content is: | |
318 | * uid, gidlist, mechanism, service-set, mech-specific-data | |
319 | */ | |
320 | ||
321 | #define RSC_HASHBITS 10 | |
322 | #define RSC_HASHMAX (1<<RSC_HASHBITS) | |
323 | #define RSC_HASHMASK (RSC_HASHMAX-1) | |
324 | ||
325 | #define GSS_SEQ_WIN 128 | |
326 | ||
327 | struct gss_svc_seq_data { | |
328 | /* highest seq number seen so far: */ | |
329 | int sd_max; | |
330 | /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of | |
331 | * sd_win is nonzero iff sequence number i has been seen already: */ | |
332 | unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; | |
333 | spinlock_t sd_lock; | |
334 | }; | |
335 | ||
336 | struct rsc { | |
337 | struct cache_head h; | |
338 | struct xdr_netobj handle; | |
339 | struct svc_cred cred; | |
340 | struct gss_svc_seq_data seqdata; | |
341 | struct gss_ctx *mechctx; | |
342 | }; | |
343 | ||
344 | static struct cache_head *rsc_table[RSC_HASHMAX]; | |
345 | static struct cache_detail rsc_cache; | |
17f834b6 N |
346 | static struct rsc *rsc_update(struct rsc *new, struct rsc *old); |
347 | static struct rsc *rsc_lookup(struct rsc *item); | |
1da177e4 LT |
348 | |
349 | static void rsc_free(struct rsc *rsci) | |
350 | { | |
351 | kfree(rsci->handle.data); | |
352 | if (rsci->mechctx) | |
353 | gss_delete_sec_context(&rsci->mechctx); | |
354 | if (rsci->cred.cr_group_info) | |
355 | put_group_info(rsci->cred.cr_group_info); | |
356 | } | |
357 | ||
baab935f | 358 | static void rsc_put(struct kref *ref) |
1da177e4 | 359 | { |
baab935f | 360 | struct rsc *rsci = container_of(ref, struct rsc, h.ref); |
1da177e4 | 361 | |
baab935f N |
362 | rsc_free(rsci); |
363 | kfree(rsci); | |
1da177e4 LT |
364 | } |
365 | ||
366 | static inline int | |
367 | rsc_hash(struct rsc *rsci) | |
368 | { | |
369 | return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); | |
370 | } | |
371 | ||
17f834b6 N |
372 | static int |
373 | rsc_match(struct cache_head *a, struct cache_head *b) | |
1da177e4 | 374 | { |
17f834b6 N |
375 | struct rsc *new = container_of(a, struct rsc, h); |
376 | struct rsc *tmp = container_of(b, struct rsc, h); | |
377 | ||
1da177e4 LT |
378 | return netobj_equal(&new->handle, &tmp->handle); |
379 | } | |
380 | ||
17f834b6 N |
381 | static void |
382 | rsc_init(struct cache_head *cnew, struct cache_head *ctmp) | |
1da177e4 | 383 | { |
17f834b6 N |
384 | struct rsc *new = container_of(cnew, struct rsc, h); |
385 | struct rsc *tmp = container_of(ctmp, struct rsc, h); | |
386 | ||
1da177e4 LT |
387 | new->handle.len = tmp->handle.len; |
388 | tmp->handle.len = 0; | |
389 | new->handle.data = tmp->handle.data; | |
390 | tmp->handle.data = NULL; | |
391 | new->mechctx = NULL; | |
392 | new->cred.cr_group_info = NULL; | |
393 | } | |
394 | ||
17f834b6 N |
395 | static void |
396 | update_rsc(struct cache_head *cnew, struct cache_head *ctmp) | |
1da177e4 | 397 | { |
17f834b6 N |
398 | struct rsc *new = container_of(cnew, struct rsc, h); |
399 | struct rsc *tmp = container_of(ctmp, struct rsc, h); | |
400 | ||
1da177e4 LT |
401 | new->mechctx = tmp->mechctx; |
402 | tmp->mechctx = NULL; | |
403 | memset(&new->seqdata, 0, sizeof(new->seqdata)); | |
404 | spin_lock_init(&new->seqdata.sd_lock); | |
405 | new->cred = tmp->cred; | |
406 | tmp->cred.cr_group_info = NULL; | |
407 | } | |
408 | ||
17f834b6 N |
409 | static struct cache_head * |
410 | rsc_alloc(void) | |
411 | { | |
412 | struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); | |
413 | if (rsci) | |
414 | return &rsci->h; | |
415 | else | |
416 | return NULL; | |
417 | } | |
418 | ||
1da177e4 LT |
419 | static int rsc_parse(struct cache_detail *cd, |
420 | char *mesg, int mlen) | |
421 | { | |
422 | /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ | |
423 | char *buf = mesg; | |
424 | int len, rv; | |
425 | struct rsc rsci, *rscp = NULL; | |
426 | time_t expiry; | |
427 | int status = -EINVAL; | |
1df0cada | 428 | struct gss_api_mech *gm = NULL; |
1da177e4 LT |
429 | |
430 | memset(&rsci, 0, sizeof(rsci)); | |
431 | /* context handle */ | |
432 | len = qword_get(&mesg, buf, mlen); | |
433 | if (len < 0) goto out; | |
434 | status = -ENOMEM; | |
435 | if (dup_to_netobj(&rsci.handle, buf, len)) | |
436 | goto out; | |
437 | ||
438 | rsci.h.flags = 0; | |
439 | /* expiry */ | |
440 | expiry = get_expiry(&mesg); | |
441 | status = -EINVAL; | |
442 | if (expiry == 0) | |
443 | goto out; | |
444 | ||
17f834b6 N |
445 | rscp = rsc_lookup(&rsci); |
446 | if (!rscp) | |
447 | goto out; | |
448 | ||
1da177e4 LT |
449 | /* uid, or NEGATIVE */ |
450 | rv = get_int(&mesg, &rsci.cred.cr_uid); | |
451 | if (rv == -EINVAL) | |
452 | goto out; | |
453 | if (rv == -ENOENT) | |
454 | set_bit(CACHE_NEGATIVE, &rsci.h.flags); | |
455 | else { | |
456 | int N, i; | |
1da177e4 LT |
457 | |
458 | /* gid */ | |
459 | if (get_int(&mesg, &rsci.cred.cr_gid)) | |
460 | goto out; | |
461 | ||
462 | /* number of additional gid's */ | |
463 | if (get_int(&mesg, &N)) | |
464 | goto out; | |
465 | status = -ENOMEM; | |
466 | rsci.cred.cr_group_info = groups_alloc(N); | |
467 | if (rsci.cred.cr_group_info == NULL) | |
468 | goto out; | |
469 | ||
470 | /* gid's */ | |
471 | status = -EINVAL; | |
472 | for (i=0; i<N; i++) { | |
473 | gid_t gid; | |
474 | if (get_int(&mesg, &gid)) | |
475 | goto out; | |
476 | GROUP_AT(rsci.cred.cr_group_info, i) = gid; | |
477 | } | |
478 | ||
479 | /* mech name */ | |
480 | len = qword_get(&mesg, buf, mlen); | |
481 | if (len < 0) | |
482 | goto out; | |
483 | gm = gss_mech_get_by_name(buf); | |
484 | status = -EOPNOTSUPP; | |
485 | if (!gm) | |
486 | goto out; | |
487 | ||
488 | status = -EINVAL; | |
489 | /* mech-specific data: */ | |
490 | len = qword_get(&mesg, buf, mlen); | |
1df0cada | 491 | if (len < 0) |
1da177e4 | 492 | goto out; |
5fb8b49e | 493 | status = gss_import_sec_context(buf, len, gm, &rsci.mechctx); |
1df0cada | 494 | if (status) |
1da177e4 | 495 | goto out; |
1da177e4 LT |
496 | } |
497 | rsci.h.expiry_time = expiry; | |
17f834b6 | 498 | rscp = rsc_update(&rsci, rscp); |
1da177e4 LT |
499 | status = 0; |
500 | out: | |
1df0cada | 501 | gss_mech_put(gm); |
1da177e4 LT |
502 | rsc_free(&rsci); |
503 | if (rscp) | |
baab935f | 504 | cache_put(&rscp->h, &rsc_cache); |
17f834b6 N |
505 | else |
506 | status = -ENOMEM; | |
1da177e4 LT |
507 | return status; |
508 | } | |
509 | ||
510 | static struct cache_detail rsc_cache = { | |
f35279d3 | 511 | .owner = THIS_MODULE, |
1da177e4 LT |
512 | .hash_size = RSC_HASHMAX, |
513 | .hash_table = rsc_table, | |
514 | .name = "auth.rpcsec.context", | |
515 | .cache_put = rsc_put, | |
516 | .cache_parse = rsc_parse, | |
17f834b6 N |
517 | .match = rsc_match, |
518 | .init = rsc_init, | |
519 | .update = update_rsc, | |
520 | .alloc = rsc_alloc, | |
1da177e4 LT |
521 | }; |
522 | ||
17f834b6 N |
523 | static struct rsc *rsc_lookup(struct rsc *item) |
524 | { | |
525 | struct cache_head *ch; | |
526 | int hash = rsc_hash(item); | |
527 | ||
528 | ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); | |
529 | if (ch) | |
530 | return container_of(ch, struct rsc, h); | |
531 | else | |
532 | return NULL; | |
533 | } | |
534 | ||
535 | static struct rsc *rsc_update(struct rsc *new, struct rsc *old) | |
536 | { | |
537 | struct cache_head *ch; | |
538 | int hash = rsc_hash(new); | |
539 | ||
540 | ch = sunrpc_cache_update(&rsc_cache, &new->h, | |
541 | &old->h, hash); | |
542 | if (ch) | |
543 | return container_of(ch, struct rsc, h); | |
544 | else | |
545 | return NULL; | |
546 | } | |
547 | ||
1da177e4 LT |
548 | |
549 | static struct rsc * | |
550 | gss_svc_searchbyctx(struct xdr_netobj *handle) | |
551 | { | |
552 | struct rsc rsci; | |
553 | struct rsc *found; | |
554 | ||
555 | memset(&rsci, 0, sizeof(rsci)); | |
556 | if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) | |
557 | return NULL; | |
17f834b6 | 558 | found = rsc_lookup(&rsci); |
1da177e4 LT |
559 | rsc_free(&rsci); |
560 | if (!found) | |
561 | return NULL; | |
562 | if (cache_check(&rsc_cache, &found->h, NULL)) | |
563 | return NULL; | |
564 | return found; | |
565 | } | |
566 | ||
567 | /* Implements sequence number algorithm as specified in RFC 2203. */ | |
568 | static int | |
569 | gss_check_seq_num(struct rsc *rsci, int seq_num) | |
570 | { | |
571 | struct gss_svc_seq_data *sd = &rsci->seqdata; | |
572 | ||
573 | spin_lock(&sd->sd_lock); | |
574 | if (seq_num > sd->sd_max) { | |
575 | if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { | |
576 | memset(sd->sd_win,0,sizeof(sd->sd_win)); | |
577 | sd->sd_max = seq_num; | |
578 | } else while (sd->sd_max < seq_num) { | |
579 | sd->sd_max++; | |
580 | __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); | |
581 | } | |
582 | __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); | |
583 | goto ok; | |
584 | } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { | |
585 | goto drop; | |
586 | } | |
587 | /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ | |
588 | if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) | |
589 | goto drop; | |
590 | ok: | |
591 | spin_unlock(&sd->sd_lock); | |
592 | return 1; | |
593 | drop: | |
594 | spin_unlock(&sd->sd_lock); | |
595 | return 0; | |
596 | } | |
597 | ||
598 | static inline u32 round_up_to_quad(u32 i) | |
599 | { | |
600 | return (i + 3 ) & ~3; | |
601 | } | |
602 | ||
603 | static inline int | |
604 | svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) | |
605 | { | |
606 | int l; | |
607 | ||
608 | if (argv->iov_len < 4) | |
609 | return -1; | |
610 | o->len = ntohl(svc_getu32(argv)); | |
611 | l = round_up_to_quad(o->len); | |
612 | if (argv->iov_len < l) | |
613 | return -1; | |
614 | o->data = argv->iov_base; | |
615 | argv->iov_base += l; | |
616 | argv->iov_len -= l; | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static inline int | |
621 | svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) | |
622 | { | |
623 | u32 *p; | |
624 | ||
625 | if (resv->iov_len + 4 > PAGE_SIZE) | |
626 | return -1; | |
627 | svc_putu32(resv, htonl(o->len)); | |
628 | p = resv->iov_base + resv->iov_len; | |
629 | resv->iov_len += round_up_to_quad(o->len); | |
630 | if (resv->iov_len > PAGE_SIZE) | |
631 | return -1; | |
632 | memcpy(p, o->data, o->len); | |
633 | memset((u8 *)p + o->len, 0, round_up_to_quad(o->len) - o->len); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /* Verify the checksum on the header and return SVC_OK on success. | |
638 | * Otherwise, return SVC_DROP (in the case of a bad sequence number) | |
639 | * or return SVC_DENIED and indicate error in authp. | |
640 | */ | |
641 | static int | |
642 | gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, | |
643 | u32 *rpcstart, struct rpc_gss_wire_cred *gc, u32 *authp) | |
644 | { | |
645 | struct gss_ctx *ctx_id = rsci->mechctx; | |
646 | struct xdr_buf rpchdr; | |
647 | struct xdr_netobj checksum; | |
648 | u32 flavor = 0; | |
649 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
650 | struct kvec iov; | |
651 | ||
652 | /* data to compute the checksum over: */ | |
653 | iov.iov_base = rpcstart; | |
654 | iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; | |
655 | xdr_buf_from_iov(&iov, &rpchdr); | |
656 | ||
657 | *authp = rpc_autherr_badverf; | |
658 | if (argv->iov_len < 4) | |
659 | return SVC_DENIED; | |
660 | flavor = ntohl(svc_getu32(argv)); | |
661 | if (flavor != RPC_AUTH_GSS) | |
662 | return SVC_DENIED; | |
663 | if (svc_safe_getnetobj(argv, &checksum)) | |
664 | return SVC_DENIED; | |
665 | ||
666 | if (rqstp->rq_deferred) /* skip verification of revisited request */ | |
667 | return SVC_OK; | |
00fd6e14 | 668 | if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { |
1da177e4 LT |
669 | *authp = rpcsec_gsserr_credproblem; |
670 | return SVC_DENIED; | |
671 | } | |
672 | ||
673 | if (gc->gc_seq > MAXSEQ) { | |
674 | dprintk("RPC: svcauth_gss: discarding request with large sequence number %d\n", | |
675 | gc->gc_seq); | |
676 | *authp = rpcsec_gsserr_ctxproblem; | |
677 | return SVC_DENIED; | |
678 | } | |
679 | if (!gss_check_seq_num(rsci, gc->gc_seq)) { | |
680 | dprintk("RPC: svcauth_gss: discarding request with old sequence number %d\n", | |
681 | gc->gc_seq); | |
682 | return SVC_DROP; | |
683 | } | |
684 | return SVC_OK; | |
685 | } | |
686 | ||
822f1005 AA |
687 | static int |
688 | gss_write_null_verf(struct svc_rqst *rqstp) | |
689 | { | |
690 | u32 *p; | |
691 | ||
692 | svc_putu32(rqstp->rq_res.head, htonl(RPC_AUTH_NULL)); | |
693 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; | |
694 | /* don't really need to check if head->iov_len > PAGE_SIZE ... */ | |
695 | *p++ = 0; | |
696 | if (!xdr_ressize_check(rqstp, p)) | |
697 | return -1; | |
698 | return 0; | |
699 | } | |
700 | ||
1da177e4 LT |
701 | static int |
702 | gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) | |
703 | { | |
704 | u32 xdr_seq; | |
705 | u32 maj_stat; | |
706 | struct xdr_buf verf_data; | |
707 | struct xdr_netobj mic; | |
708 | u32 *p; | |
709 | struct kvec iov; | |
710 | ||
711 | svc_putu32(rqstp->rq_res.head, htonl(RPC_AUTH_GSS)); | |
712 | xdr_seq = htonl(seq); | |
713 | ||
714 | iov.iov_base = &xdr_seq; | |
715 | iov.iov_len = sizeof(xdr_seq); | |
716 | xdr_buf_from_iov(&iov, &verf_data); | |
717 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; | |
718 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 719 | maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); |
1da177e4 LT |
720 | if (maj_stat != GSS_S_COMPLETE) |
721 | return -1; | |
722 | *p++ = htonl(mic.len); | |
723 | memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); | |
724 | p += XDR_QUADLEN(mic.len); | |
725 | if (!xdr_ressize_check(rqstp, p)) | |
726 | return -1; | |
727 | return 0; | |
728 | } | |
729 | ||
730 | struct gss_domain { | |
731 | struct auth_domain h; | |
732 | u32 pseudoflavor; | |
733 | }; | |
734 | ||
735 | static struct auth_domain * | |
736 | find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) | |
737 | { | |
738 | char *name; | |
739 | ||
740 | name = gss_service_to_auth_domain_name(ctx->mech_type, svc); | |
741 | if (!name) | |
742 | return NULL; | |
743 | return auth_domain_find(name); | |
744 | } | |
745 | ||
efc36aa5 N |
746 | static struct auth_ops svcauthops_gss; |
747 | ||
1da177e4 LT |
748 | int |
749 | svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) | |
750 | { | |
751 | struct gss_domain *new; | |
752 | struct auth_domain *test; | |
753 | int stat = -ENOMEM; | |
754 | ||
755 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
756 | if (!new) | |
757 | goto out; | |
efc36aa5 | 758 | kref_init(&new->h.ref); |
1da177e4 LT |
759 | new->h.name = kmalloc(strlen(name) + 1, GFP_KERNEL); |
760 | if (!new->h.name) | |
761 | goto out_free_dom; | |
762 | strcpy(new->h.name, name); | |
efc36aa5 | 763 | new->h.flavour = &svcauthops_gss; |
1da177e4 | 764 | new->pseudoflavor = pseudoflavor; |
1da177e4 | 765 | |
efc36aa5 N |
766 | test = auth_domain_lookup(name, &new->h); |
767 | if (test != &new->h) { /* XXX Duplicate registration? */ | |
1da177e4 | 768 | auth_domain_put(&new->h); |
efc36aa5 | 769 | /* dangling ref-count... */ |
1da177e4 LT |
770 | goto out; |
771 | } | |
772 | return 0; | |
773 | ||
774 | out_free_dom: | |
775 | kfree(new); | |
776 | out: | |
777 | return stat; | |
778 | } | |
779 | ||
780 | EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor); | |
781 | ||
782 | static inline int | |
783 | read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) | |
784 | { | |
785 | u32 raw; | |
786 | int status; | |
787 | ||
788 | status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); | |
789 | if (status) | |
790 | return status; | |
791 | *obj = ntohl(raw); | |
792 | return 0; | |
793 | } | |
794 | ||
795 | /* It would be nice if this bit of code could be shared with the client. | |
796 | * Obstacles: | |
797 | * The client shouldn't malloc(), would have to pass in own memory. | |
798 | * The server uses base of head iovec as read pointer, while the | |
799 | * client uses separate pointer. */ | |
800 | static int | |
801 | unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) | |
802 | { | |
803 | int stat = -EINVAL; | |
804 | u32 integ_len, maj_stat; | |
805 | struct xdr_netobj mic; | |
806 | struct xdr_buf integ_buf; | |
807 | ||
808 | integ_len = ntohl(svc_getu32(&buf->head[0])); | |
809 | if (integ_len & 3) | |
810 | goto out; | |
811 | if (integ_len > buf->len) | |
812 | goto out; | |
813 | if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) | |
814 | BUG(); | |
815 | /* copy out mic... */ | |
816 | if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) | |
817 | BUG(); | |
818 | if (mic.len > RPC_MAX_AUTH_SIZE) | |
819 | goto out; | |
820 | mic.data = kmalloc(mic.len, GFP_KERNEL); | |
821 | if (!mic.data) | |
822 | goto out; | |
823 | if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) | |
824 | goto out; | |
00fd6e14 | 825 | maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); |
1da177e4 LT |
826 | if (maj_stat != GSS_S_COMPLETE) |
827 | goto out; | |
828 | if (ntohl(svc_getu32(&buf->head[0])) != seq) | |
829 | goto out; | |
830 | stat = 0; | |
831 | out: | |
832 | return stat; | |
833 | } | |
834 | ||
835 | struct gss_svc_data { | |
836 | /* decoded gss client cred: */ | |
837 | struct rpc_gss_wire_cred clcred; | |
838 | /* pointer to the beginning of the procedure-specific results, | |
839 | * which may be encrypted/checksummed in svcauth_gss_release: */ | |
840 | u32 *body_start; | |
841 | struct rsc *rsci; | |
842 | }; | |
843 | ||
844 | static int | |
845 | svcauth_gss_set_client(struct svc_rqst *rqstp) | |
846 | { | |
847 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; | |
848 | struct rsc *rsci = svcdata->rsci; | |
849 | struct rpc_gss_wire_cred *gc = &svcdata->clcred; | |
850 | ||
851 | rqstp->rq_client = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); | |
852 | if (rqstp->rq_client == NULL) | |
853 | return SVC_DENIED; | |
854 | return SVC_OK; | |
855 | } | |
856 | ||
91a4762e KC |
857 | static inline int |
858 | gss_write_init_verf(struct svc_rqst *rqstp, struct rsi *rsip) | |
859 | { | |
860 | struct rsc *rsci; | |
861 | ||
862 | if (rsip->major_status != GSS_S_COMPLETE) | |
863 | return gss_write_null_verf(rqstp); | |
864 | rsci = gss_svc_searchbyctx(&rsip->out_handle); | |
865 | if (rsci == NULL) { | |
866 | rsip->major_status = GSS_S_NO_CONTEXT; | |
867 | return gss_write_null_verf(rqstp); | |
868 | } | |
869 | return gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); | |
870 | } | |
871 | ||
1da177e4 LT |
872 | /* |
873 | * Accept an rpcsec packet. | |
874 | * If context establishment, punt to user space | |
875 | * If data exchange, verify/decrypt | |
876 | * If context destruction, handle here | |
877 | * In the context establishment and destruction case we encode | |
878 | * response here and return SVC_COMPLETE. | |
879 | */ | |
880 | static int | |
881 | svcauth_gss_accept(struct svc_rqst *rqstp, u32 *authp) | |
882 | { | |
883 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
884 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
885 | u32 crlen; | |
886 | struct xdr_netobj tmpobj; | |
887 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; | |
888 | struct rpc_gss_wire_cred *gc; | |
889 | struct rsc *rsci = NULL; | |
890 | struct rsi *rsip, rsikey; | |
891 | u32 *rpcstart; | |
892 | u32 *reject_stat = resv->iov_base + resv->iov_len; | |
893 | int ret; | |
894 | ||
895 | dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",argv->iov_len); | |
896 | ||
897 | *authp = rpc_autherr_badcred; | |
898 | if (!svcdata) | |
899 | svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); | |
900 | if (!svcdata) | |
901 | goto auth_err; | |
902 | rqstp->rq_auth_data = svcdata; | |
903 | svcdata->body_start = NULL; | |
904 | svcdata->rsci = NULL; | |
905 | gc = &svcdata->clcred; | |
906 | ||
907 | /* start of rpc packet is 7 u32's back from here: | |
908 | * xid direction rpcversion prog vers proc flavour | |
909 | */ | |
910 | rpcstart = argv->iov_base; | |
911 | rpcstart -= 7; | |
912 | ||
913 | /* credential is: | |
914 | * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle | |
915 | * at least 5 u32s, and is preceeded by length, so that makes 6. | |
916 | */ | |
917 | ||
918 | if (argv->iov_len < 5 * 4) | |
919 | goto auth_err; | |
920 | crlen = ntohl(svc_getu32(argv)); | |
921 | if (ntohl(svc_getu32(argv)) != RPC_GSS_VERSION) | |
922 | goto auth_err; | |
923 | gc->gc_proc = ntohl(svc_getu32(argv)); | |
924 | gc->gc_seq = ntohl(svc_getu32(argv)); | |
925 | gc->gc_svc = ntohl(svc_getu32(argv)); | |
926 | if (svc_safe_getnetobj(argv, &gc->gc_ctx)) | |
927 | goto auth_err; | |
928 | if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) | |
929 | goto auth_err; | |
930 | ||
931 | if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) | |
932 | goto auth_err; | |
933 | ||
934 | /* | |
935 | * We've successfully parsed the credential. Let's check out the | |
936 | * verifier. An AUTH_NULL verifier is allowed (and required) for | |
937 | * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for | |
938 | * PROC_DATA and PROC_DESTROY. | |
939 | * | |
940 | * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length). | |
941 | * AUTH_RPCSEC_GSS verifier is: | |
942 | * 6 (AUTH_RPCSEC_GSS), length, checksum. | |
943 | * checksum is calculated over rpcheader from xid up to here. | |
944 | */ | |
945 | *authp = rpc_autherr_badverf; | |
946 | switch (gc->gc_proc) { | |
947 | case RPC_GSS_PROC_INIT: | |
948 | case RPC_GSS_PROC_CONTINUE_INIT: | |
949 | if (argv->iov_len < 2 * 4) | |
950 | goto auth_err; | |
951 | if (ntohl(svc_getu32(argv)) != RPC_AUTH_NULL) | |
952 | goto auth_err; | |
953 | if (ntohl(svc_getu32(argv)) != 0) | |
954 | goto auth_err; | |
955 | break; | |
956 | case RPC_GSS_PROC_DATA: | |
957 | case RPC_GSS_PROC_DESTROY: | |
958 | *authp = rpcsec_gsserr_credproblem; | |
959 | rsci = gss_svc_searchbyctx(&gc->gc_ctx); | |
960 | if (!rsci) | |
961 | goto auth_err; | |
962 | switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { | |
963 | case SVC_OK: | |
964 | break; | |
965 | case SVC_DENIED: | |
966 | goto auth_err; | |
967 | case SVC_DROP: | |
968 | goto drop; | |
969 | } | |
970 | break; | |
971 | default: | |
972 | *authp = rpc_autherr_rejectedcred; | |
973 | goto auth_err; | |
974 | } | |
975 | ||
976 | /* now act upon the command: */ | |
977 | switch (gc->gc_proc) { | |
978 | case RPC_GSS_PROC_INIT: | |
979 | case RPC_GSS_PROC_CONTINUE_INIT: | |
980 | *authp = rpc_autherr_badcred; | |
981 | if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) | |
982 | goto auth_err; | |
983 | memset(&rsikey, 0, sizeof(rsikey)); | |
984 | if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) | |
985 | goto drop; | |
986 | *authp = rpc_autherr_badverf; | |
987 | if (svc_safe_getnetobj(argv, &tmpobj)) { | |
988 | kfree(rsikey.in_handle.data); | |
989 | goto auth_err; | |
990 | } | |
991 | if (dup_netobj(&rsikey.in_token, &tmpobj)) { | |
992 | kfree(rsikey.in_handle.data); | |
993 | goto drop; | |
994 | } | |
995 | ||
d4d11ea9 | 996 | rsip = rsi_lookup(&rsikey); |
1da177e4 LT |
997 | rsi_free(&rsikey); |
998 | if (!rsip) { | |
999 | goto drop; | |
1000 | } | |
1001 | switch(cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) { | |
1002 | case -EAGAIN: | |
1003 | goto drop; | |
1004 | case -ENOENT: | |
1005 | goto drop; | |
1006 | case 0: | |
91a4762e KC |
1007 | if (gss_write_init_verf(rqstp, rsip)) |
1008 | goto drop; | |
1da177e4 LT |
1009 | if (resv->iov_len + 4 > PAGE_SIZE) |
1010 | goto drop; | |
1011 | svc_putu32(resv, rpc_success); | |
1012 | if (svc_safe_putnetobj(resv, &rsip->out_handle)) | |
1013 | goto drop; | |
1014 | if (resv->iov_len + 3 * 4 > PAGE_SIZE) | |
1015 | goto drop; | |
1016 | svc_putu32(resv, htonl(rsip->major_status)); | |
1017 | svc_putu32(resv, htonl(rsip->minor_status)); | |
1018 | svc_putu32(resv, htonl(GSS_SEQ_WIN)); | |
1019 | if (svc_safe_putnetobj(resv, &rsip->out_token)) | |
1020 | goto drop; | |
1021 | rqstp->rq_client = NULL; | |
1022 | } | |
1023 | goto complete; | |
1024 | case RPC_GSS_PROC_DESTROY: | |
1025 | set_bit(CACHE_NEGATIVE, &rsci->h.flags); | |
1026 | if (resv->iov_len + 4 > PAGE_SIZE) | |
1027 | goto drop; | |
1028 | svc_putu32(resv, rpc_success); | |
1029 | goto complete; | |
1030 | case RPC_GSS_PROC_DATA: | |
1031 | *authp = rpcsec_gsserr_ctxproblem; | |
1032 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) | |
1033 | goto auth_err; | |
1034 | rqstp->rq_cred = rsci->cred; | |
1035 | get_group_info(rsci->cred.cr_group_info); | |
1036 | *authp = rpc_autherr_badcred; | |
1037 | switch (gc->gc_svc) { | |
1038 | case RPC_GSS_SVC_NONE: | |
1039 | break; | |
1040 | case RPC_GSS_SVC_INTEGRITY: | |
1041 | if (unwrap_integ_data(&rqstp->rq_arg, | |
1042 | gc->gc_seq, rsci->mechctx)) | |
1043 | goto auth_err; | |
1044 | /* placeholders for length and seq. number: */ | |
1045 | svcdata->body_start = resv->iov_base + resv->iov_len; | |
1046 | svc_putu32(resv, 0); | |
1047 | svc_putu32(resv, 0); | |
1048 | break; | |
1049 | case RPC_GSS_SVC_PRIVACY: | |
1050 | /* currently unsupported */ | |
1051 | default: | |
1052 | goto auth_err; | |
1053 | } | |
1054 | svcdata->rsci = rsci; | |
1055 | cache_get(&rsci->h); | |
1056 | ret = SVC_OK; | |
1057 | goto out; | |
1058 | } | |
1059 | auth_err: | |
1060 | /* Restore write pointer to original value: */ | |
1061 | xdr_ressize_check(rqstp, reject_stat); | |
1062 | ret = SVC_DENIED; | |
1063 | goto out; | |
1064 | complete: | |
1065 | ret = SVC_COMPLETE; | |
1066 | goto out; | |
1067 | drop: | |
1068 | ret = SVC_DROP; | |
1069 | out: | |
1070 | if (rsci) | |
baab935f | 1071 | cache_put(&rsci->h, &rsc_cache); |
1da177e4 LT |
1072 | return ret; |
1073 | } | |
1074 | ||
e142ede8 BF |
1075 | static inline int |
1076 | svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) | |
1da177e4 LT |
1077 | { |
1078 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1079 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1080 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1081 | struct xdr_buf integ_buf; | |
1082 | struct xdr_netobj mic; | |
1083 | struct kvec *resv; | |
1084 | u32 *p; | |
1085 | int integ_offset, integ_len; | |
1086 | int stat = -EINVAL; | |
1087 | ||
e142ede8 BF |
1088 | p = gsd->body_start; |
1089 | gsd->body_start = NULL; | |
1090 | /* move accept_stat to right place: */ | |
1091 | memcpy(p, p + 2, 4); | |
1092 | /* don't wrap in failure case: */ | |
1093 | /* Note: counting on not getting here if call was not even | |
1094 | * accepted! */ | |
1095 | if (*p != rpc_success) { | |
1096 | resbuf->head[0].iov_len -= 2 * 4; | |
1097 | goto out; | |
1098 | } | |
1099 | p++; | |
1100 | integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; | |
1101 | integ_len = resbuf->len - integ_offset; | |
1102 | BUG_ON(integ_len % 4); | |
1103 | *p++ = htonl(integ_len); | |
1104 | *p++ = htonl(gc->gc_seq); | |
1105 | if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, | |
1106 | integ_len)) | |
1107 | BUG(); | |
1108 | if (resbuf->page_len == 0 | |
1109 | && resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE | |
1110 | < PAGE_SIZE) { | |
1111 | BUG_ON(resbuf->tail[0].iov_len); | |
1112 | /* Use head for everything */ | |
1113 | resv = &resbuf->head[0]; | |
1114 | } else if (resbuf->tail[0].iov_base == NULL) { | |
1115 | if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) | |
1116 | goto out_err; | |
1117 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base | |
1118 | + resbuf->head[0].iov_len; | |
1119 | resbuf->tail[0].iov_len = 0; | |
1120 | rqstp->rq_restailpage = 0; | |
1121 | resv = &resbuf->tail[0]; | |
1122 | } else { | |
1123 | resv = &resbuf->tail[0]; | |
1124 | } | |
1125 | mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; | |
1126 | if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) | |
1127 | goto out_err; | |
1128 | svc_putu32(resv, htonl(mic.len)); | |
1129 | memset(mic.data + mic.len, 0, | |
1130 | round_up_to_quad(mic.len) - mic.len); | |
1131 | resv->iov_len += XDR_QUADLEN(mic.len) << 2; | |
1132 | /* not strictly required: */ | |
1133 | resbuf->len += XDR_QUADLEN(mic.len) << 2; | |
1134 | BUG_ON(resv->iov_len > PAGE_SIZE); | |
1135 | out: | |
1136 | stat = 0; | |
1137 | out_err: | |
1138 | return stat; | |
1139 | } | |
1140 | ||
1141 | static int | |
1142 | svcauth_gss_release(struct svc_rqst *rqstp) | |
1143 | { | |
1144 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1145 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1146 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1147 | int stat = -EINVAL; | |
1148 | ||
1da177e4 LT |
1149 | if (gc->gc_proc != RPC_GSS_PROC_DATA) |
1150 | goto out; | |
1151 | /* Release can be called twice, but we only wrap once. */ | |
1152 | if (gsd->body_start == NULL) | |
1153 | goto out; | |
1154 | /* normally not set till svc_send, but we need it here: */ | |
1155 | resbuf->len = resbuf->head[0].iov_len | |
1156 | + resbuf->page_len + resbuf->tail[0].iov_len; | |
1157 | switch (gc->gc_svc) { | |
1158 | case RPC_GSS_SVC_NONE: | |
1159 | break; | |
1160 | case RPC_GSS_SVC_INTEGRITY: | |
e142ede8 | 1161 | svcauth_gss_wrap_resp_integ(rqstp); |
1da177e4 LT |
1162 | break; |
1163 | case RPC_GSS_SVC_PRIVACY: | |
1164 | default: | |
1165 | goto out_err; | |
1166 | } | |
1167 | ||
1168 | out: | |
1169 | stat = 0; | |
1170 | out_err: | |
1171 | if (rqstp->rq_client) | |
1172 | auth_domain_put(rqstp->rq_client); | |
1173 | rqstp->rq_client = NULL; | |
1174 | if (rqstp->rq_cred.cr_group_info) | |
1175 | put_group_info(rqstp->rq_cred.cr_group_info); | |
1176 | rqstp->rq_cred.cr_group_info = NULL; | |
1177 | if (gsd->rsci) | |
baab935f | 1178 | cache_put(&gsd->rsci->h, &rsc_cache); |
1da177e4 LT |
1179 | gsd->rsci = NULL; |
1180 | ||
1181 | return stat; | |
1182 | } | |
1183 | ||
1184 | static void | |
1185 | svcauth_gss_domain_release(struct auth_domain *dom) | |
1186 | { | |
1187 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); | |
1188 | ||
1189 | kfree(dom->name); | |
1190 | kfree(gd); | |
1191 | } | |
1192 | ||
1193 | static struct auth_ops svcauthops_gss = { | |
1194 | .name = "rpcsec_gss", | |
1195 | .owner = THIS_MODULE, | |
1196 | .flavour = RPC_AUTH_GSS, | |
1197 | .accept = svcauth_gss_accept, | |
1198 | .release = svcauth_gss_release, | |
1199 | .domain_release = svcauth_gss_domain_release, | |
1200 | .set_client = svcauth_gss_set_client, | |
1201 | }; | |
1202 | ||
1203 | int | |
1204 | gss_svc_init(void) | |
1205 | { | |
1206 | int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); | |
1207 | if (rv == 0) { | |
1208 | cache_register(&rsc_cache); | |
1209 | cache_register(&rsi_cache); | |
1210 | } | |
1211 | return rv; | |
1212 | } | |
1213 | ||
1214 | void | |
1215 | gss_svc_shutdown(void) | |
1216 | { | |
f35279d3 BA |
1217 | if (cache_unregister(&rsc_cache)) |
1218 | printk(KERN_ERR "auth_rpcgss: failed to unregister rsc cache\n"); | |
1219 | if (cache_unregister(&rsi_cache)) | |
1220 | printk(KERN_ERR "auth_rpcgss: failed to unregister rsi cache\n"); | |
1da177e4 LT |
1221 | svc_auth_unregister(RPC_AUTH_GSS); |
1222 | } |