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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 | ||
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | #include <linux/types.h> |
42 | #include <linux/module.h> | |
43 | #include <linux/pagemap.h> | |
44 | ||
45 | #include <linux/sunrpc/auth_gss.h> | |
1da177e4 LT |
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); | |
f64f9e71 JP |
109 | return netobj_equal(&item->in_handle, &tmp->in_handle) && |
110 | netobj_equal(&item->in_token, &tmp->in_token); | |
1da177e4 LT |
111 | } |
112 | ||
113 | static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) | |
114 | { | |
115 | dst->len = len; | |
e69062b4 | 116 | dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL); |
1da177e4 LT |
117 | if (len && !dst->data) |
118 | return -ENOMEM; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) | |
123 | { | |
124 | return dup_to_netobj(dst, src->data, src->len); | |
125 | } | |
126 | ||
d4d11ea9 | 127 | static void rsi_init(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 128 | { |
d4d11ea9 N |
129 | struct rsi *new = container_of(cnew, struct rsi, h); |
130 | struct rsi *item = container_of(citem, struct rsi, h); | |
131 | ||
1da177e4 LT |
132 | new->out_handle.data = NULL; |
133 | new->out_handle.len = 0; | |
134 | new->out_token.data = NULL; | |
135 | new->out_token.len = 0; | |
136 | new->in_handle.len = item->in_handle.len; | |
137 | item->in_handle.len = 0; | |
138 | new->in_token.len = item->in_token.len; | |
139 | item->in_token.len = 0; | |
140 | new->in_handle.data = item->in_handle.data; | |
141 | item->in_handle.data = NULL; | |
142 | new->in_token.data = item->in_token.data; | |
143 | item->in_token.data = NULL; | |
144 | } | |
145 | ||
d4d11ea9 | 146 | static void update_rsi(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 147 | { |
d4d11ea9 N |
148 | struct rsi *new = container_of(cnew, struct rsi, h); |
149 | struct rsi *item = container_of(citem, struct rsi, h); | |
150 | ||
1da177e4 LT |
151 | BUG_ON(new->out_handle.data || new->out_token.data); |
152 | new->out_handle.len = item->out_handle.len; | |
153 | item->out_handle.len = 0; | |
154 | new->out_token.len = item->out_token.len; | |
155 | item->out_token.len = 0; | |
156 | new->out_handle.data = item->out_handle.data; | |
157 | item->out_handle.data = NULL; | |
158 | new->out_token.data = item->out_token.data; | |
159 | item->out_token.data = NULL; | |
160 | ||
161 | new->major_status = item->major_status; | |
162 | new->minor_status = item->minor_status; | |
163 | } | |
164 | ||
d4d11ea9 N |
165 | static struct cache_head *rsi_alloc(void) |
166 | { | |
167 | struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); | |
168 | if (rsii) | |
169 | return &rsii->h; | |
170 | else | |
171 | return NULL; | |
172 | } | |
173 | ||
1da177e4 | 174 | static void rsi_request(struct cache_detail *cd, |
cca5172a YH |
175 | struct cache_head *h, |
176 | char **bpp, int *blen) | |
1da177e4 LT |
177 | { |
178 | struct rsi *rsii = container_of(h, struct rsi, h); | |
179 | ||
180 | qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); | |
181 | qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); | |
182 | (*bpp)[-1] = '\n'; | |
183 | } | |
184 | ||
bc74b4f5 TM |
185 | static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) |
186 | { | |
187 | return sunrpc_cache_pipe_upcall(cd, h, rsi_request); | |
188 | } | |
189 | ||
1da177e4 LT |
190 | |
191 | static int rsi_parse(struct cache_detail *cd, | |
cca5172a | 192 | char *mesg, int mlen) |
1da177e4 LT |
193 | { |
194 | /* context token expiry major minor context token */ | |
195 | char *buf = mesg; | |
196 | char *ep; | |
197 | int len; | |
198 | struct rsi rsii, *rsip = NULL; | |
199 | time_t expiry; | |
200 | int status = -EINVAL; | |
201 | ||
202 | memset(&rsii, 0, sizeof(rsii)); | |
203 | /* handle */ | |
204 | len = qword_get(&mesg, buf, mlen); | |
205 | if (len < 0) | |
206 | goto out; | |
207 | status = -ENOMEM; | |
208 | if (dup_to_netobj(&rsii.in_handle, buf, len)) | |
209 | goto out; | |
210 | ||
211 | /* token */ | |
212 | len = qword_get(&mesg, buf, mlen); | |
213 | status = -EINVAL; | |
214 | if (len < 0) | |
215 | goto out; | |
216 | status = -ENOMEM; | |
217 | if (dup_to_netobj(&rsii.in_token, buf, len)) | |
218 | goto out; | |
219 | ||
d4d11ea9 N |
220 | rsip = rsi_lookup(&rsii); |
221 | if (!rsip) | |
222 | goto out; | |
223 | ||
1da177e4 LT |
224 | rsii.h.flags = 0; |
225 | /* expiry */ | |
226 | expiry = get_expiry(&mesg); | |
227 | status = -EINVAL; | |
228 | if (expiry == 0) | |
229 | goto out; | |
230 | ||
231 | /* major/minor */ | |
232 | len = qword_get(&mesg, buf, mlen); | |
b39c18fc BF |
233 | if (len <= 0) |
234 | goto out; | |
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) | |
1da177e4 | 240 | goto out; |
b39c18fc BF |
241 | rsii.minor_status = simple_strtoul(buf, &ep, 10); |
242 | if (*ep) | |
1da177e4 | 243 | goto out; |
1da177e4 | 244 | |
b39c18fc BF |
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; | |
1da177e4 | 252 | |
b39c18fc BF |
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; | |
1da177e4 | 261 | rsii.h.expiry_time = expiry; |
d4d11ea9 | 262 | rsip = rsi_update(&rsii, rsip); |
1da177e4 LT |
263 | status = 0; |
264 | out: | |
265 | rsi_free(&rsii); | |
266 | if (rsip) | |
baab935f | 267 | cache_put(&rsip->h, &rsi_cache); |
d4d11ea9 N |
268 | else |
269 | status = -ENOMEM; | |
1da177e4 LT |
270 | return status; |
271 | } | |
272 | ||
273 | static struct cache_detail rsi_cache = { | |
f35279d3 | 274 | .owner = THIS_MODULE, |
1da177e4 LT |
275 | .hash_size = RSI_HASHMAX, |
276 | .hash_table = rsi_table, | |
277 | .name = "auth.rpcsec.init", | |
278 | .cache_put = rsi_put, | |
bc74b4f5 | 279 | .cache_upcall = rsi_upcall, |
1da177e4 | 280 | .cache_parse = rsi_parse, |
d4d11ea9 N |
281 | .match = rsi_match, |
282 | .init = rsi_init, | |
283 | .update = update_rsi, | |
284 | .alloc = rsi_alloc, | |
1da177e4 LT |
285 | }; |
286 | ||
d4d11ea9 N |
287 | static struct rsi *rsi_lookup(struct rsi *item) |
288 | { | |
289 | struct cache_head *ch; | |
290 | int hash = rsi_hash(item); | |
291 | ||
292 | ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); | |
293 | if (ch) | |
294 | return container_of(ch, struct rsi, h); | |
295 | else | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | static struct rsi *rsi_update(struct rsi *new, struct rsi *old) | |
300 | { | |
301 | struct cache_head *ch; | |
302 | int hash = rsi_hash(new); | |
303 | ||
304 | ch = sunrpc_cache_update(&rsi_cache, &new->h, | |
305 | &old->h, hash); | |
306 | if (ch) | |
307 | return container_of(ch, struct rsi, h); | |
308 | else | |
309 | return NULL; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | |
313 | /* | |
314 | * The rpcsec_context cache is used to store a context that is | |
315 | * used in data exchange. | |
316 | * The key is a context handle. The content is: | |
317 | * uid, gidlist, mechanism, service-set, mech-specific-data | |
318 | */ | |
319 | ||
320 | #define RSC_HASHBITS 10 | |
321 | #define RSC_HASHMAX (1<<RSC_HASHBITS) | |
322 | #define RSC_HASHMASK (RSC_HASHMAX-1) | |
323 | ||
324 | #define GSS_SEQ_WIN 128 | |
325 | ||
326 | struct gss_svc_seq_data { | |
327 | /* highest seq number seen so far: */ | |
328 | int sd_max; | |
329 | /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of | |
330 | * sd_win is nonzero iff sequence number i has been seen already: */ | |
331 | unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; | |
332 | spinlock_t sd_lock; | |
333 | }; | |
334 | ||
335 | struct rsc { | |
336 | struct cache_head h; | |
337 | struct xdr_netobj handle; | |
338 | struct svc_cred cred; | |
339 | struct gss_svc_seq_data seqdata; | |
340 | struct gss_ctx *mechctx; | |
68e76ad0 | 341 | char *client_name; |
1da177e4 LT |
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); | |
68e76ad0 | 356 | kfree(rsci->client_name); |
1da177e4 LT |
357 | } |
358 | ||
baab935f | 359 | static void rsc_put(struct kref *ref) |
1da177e4 | 360 | { |
baab935f | 361 | struct rsc *rsci = container_of(ref, struct rsc, h.ref); |
1da177e4 | 362 | |
baab935f N |
363 | rsc_free(rsci); |
364 | kfree(rsci); | |
1da177e4 LT |
365 | } |
366 | ||
367 | static inline int | |
368 | rsc_hash(struct rsc *rsci) | |
369 | { | |
370 | return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); | |
371 | } | |
372 | ||
17f834b6 N |
373 | static int |
374 | rsc_match(struct cache_head *a, struct cache_head *b) | |
1da177e4 | 375 | { |
17f834b6 N |
376 | struct rsc *new = container_of(a, struct rsc, h); |
377 | struct rsc *tmp = container_of(b, struct rsc, h); | |
378 | ||
1da177e4 LT |
379 | return netobj_equal(&new->handle, &tmp->handle); |
380 | } | |
381 | ||
17f834b6 N |
382 | static void |
383 | rsc_init(struct cache_head *cnew, struct cache_head *ctmp) | |
1da177e4 | 384 | { |
17f834b6 N |
385 | struct rsc *new = container_of(cnew, struct rsc, h); |
386 | struct rsc *tmp = container_of(ctmp, struct rsc, h); | |
387 | ||
1da177e4 LT |
388 | new->handle.len = tmp->handle.len; |
389 | tmp->handle.len = 0; | |
390 | new->handle.data = tmp->handle.data; | |
391 | tmp->handle.data = NULL; | |
392 | new->mechctx = NULL; | |
393 | new->cred.cr_group_info = NULL; | |
68e76ad0 | 394 | new->client_name = NULL; |
1da177e4 LT |
395 | } |
396 | ||
17f834b6 N |
397 | static void |
398 | update_rsc(struct cache_head *cnew, struct cache_head *ctmp) | |
1da177e4 | 399 | { |
17f834b6 N |
400 | struct rsc *new = container_of(cnew, struct rsc, h); |
401 | struct rsc *tmp = container_of(ctmp, struct rsc, h); | |
402 | ||
1da177e4 LT |
403 | new->mechctx = tmp->mechctx; |
404 | tmp->mechctx = NULL; | |
405 | memset(&new->seqdata, 0, sizeof(new->seqdata)); | |
406 | spin_lock_init(&new->seqdata.sd_lock); | |
407 | new->cred = tmp->cred; | |
408 | tmp->cred.cr_group_info = NULL; | |
68e76ad0 OK |
409 | new->client_name = tmp->client_name; |
410 | tmp->client_name = NULL; | |
1da177e4 LT |
411 | } |
412 | ||
17f834b6 N |
413 | static struct cache_head * |
414 | rsc_alloc(void) | |
415 | { | |
416 | struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); | |
417 | if (rsci) | |
418 | return &rsci->h; | |
419 | else | |
420 | return NULL; | |
421 | } | |
422 | ||
1da177e4 LT |
423 | static int rsc_parse(struct cache_detail *cd, |
424 | char *mesg, int mlen) | |
425 | { | |
426 | /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ | |
427 | char *buf = mesg; | |
428 | int len, rv; | |
429 | struct rsc rsci, *rscp = NULL; | |
430 | time_t expiry; | |
431 | int status = -EINVAL; | |
1df0cada | 432 | struct gss_api_mech *gm = NULL; |
1da177e4 LT |
433 | |
434 | memset(&rsci, 0, sizeof(rsci)); | |
435 | /* context handle */ | |
436 | len = qword_get(&mesg, buf, mlen); | |
437 | if (len < 0) goto out; | |
438 | status = -ENOMEM; | |
439 | if (dup_to_netobj(&rsci.handle, buf, len)) | |
440 | goto out; | |
441 | ||
442 | rsci.h.flags = 0; | |
443 | /* expiry */ | |
444 | expiry = get_expiry(&mesg); | |
445 | status = -EINVAL; | |
446 | if (expiry == 0) | |
447 | goto out; | |
448 | ||
17f834b6 N |
449 | rscp = rsc_lookup(&rsci); |
450 | if (!rscp) | |
451 | goto out; | |
452 | ||
1da177e4 LT |
453 | /* uid, or NEGATIVE */ |
454 | rv = get_int(&mesg, &rsci.cred.cr_uid); | |
455 | if (rv == -EINVAL) | |
456 | goto out; | |
457 | if (rv == -ENOENT) | |
458 | set_bit(CACHE_NEGATIVE, &rsci.h.flags); | |
459 | else { | |
460 | int N, i; | |
1da177e4 LT |
461 | |
462 | /* gid */ | |
463 | if (get_int(&mesg, &rsci.cred.cr_gid)) | |
464 | goto out; | |
465 | ||
466 | /* number of additional gid's */ | |
467 | if (get_int(&mesg, &N)) | |
468 | goto out; | |
469 | status = -ENOMEM; | |
470 | rsci.cred.cr_group_info = groups_alloc(N); | |
471 | if (rsci.cred.cr_group_info == NULL) | |
472 | goto out; | |
473 | ||
474 | /* gid's */ | |
475 | status = -EINVAL; | |
476 | for (i=0; i<N; i++) { | |
477 | gid_t gid; | |
478 | if (get_int(&mesg, &gid)) | |
479 | goto out; | |
480 | GROUP_AT(rsci.cred.cr_group_info, i) = gid; | |
481 | } | |
482 | ||
483 | /* mech name */ | |
484 | len = qword_get(&mesg, buf, mlen); | |
485 | if (len < 0) | |
486 | goto out; | |
487 | gm = gss_mech_get_by_name(buf); | |
488 | status = -EOPNOTSUPP; | |
489 | if (!gm) | |
490 | goto out; | |
491 | ||
492 | status = -EINVAL; | |
493 | /* mech-specific data: */ | |
494 | len = qword_get(&mesg, buf, mlen); | |
1df0cada | 495 | if (len < 0) |
1da177e4 | 496 | goto out; |
1f4c86c0 | 497 | status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL); |
1df0cada | 498 | if (status) |
1da177e4 | 499 | goto out; |
68e76ad0 OK |
500 | |
501 | /* get client name */ | |
502 | len = qword_get(&mesg, buf, mlen); | |
503 | if (len > 0) { | |
504 | rsci.client_name = kstrdup(buf, GFP_KERNEL); | |
505 | if (!rsci.client_name) | |
506 | goto out; | |
507 | } | |
508 | ||
1da177e4 LT |
509 | } |
510 | rsci.h.expiry_time = expiry; | |
17f834b6 | 511 | rscp = rsc_update(&rsci, rscp); |
1da177e4 LT |
512 | status = 0; |
513 | out: | |
1df0cada | 514 | gss_mech_put(gm); |
1da177e4 LT |
515 | rsc_free(&rsci); |
516 | if (rscp) | |
baab935f | 517 | cache_put(&rscp->h, &rsc_cache); |
17f834b6 N |
518 | else |
519 | status = -ENOMEM; | |
1da177e4 LT |
520 | return status; |
521 | } | |
522 | ||
523 | static struct cache_detail rsc_cache = { | |
f35279d3 | 524 | .owner = THIS_MODULE, |
1da177e4 LT |
525 | .hash_size = RSC_HASHMAX, |
526 | .hash_table = rsc_table, | |
527 | .name = "auth.rpcsec.context", | |
528 | .cache_put = rsc_put, | |
529 | .cache_parse = rsc_parse, | |
17f834b6 N |
530 | .match = rsc_match, |
531 | .init = rsc_init, | |
532 | .update = update_rsc, | |
533 | .alloc = rsc_alloc, | |
1da177e4 LT |
534 | }; |
535 | ||
17f834b6 N |
536 | static struct rsc *rsc_lookup(struct rsc *item) |
537 | { | |
538 | struct cache_head *ch; | |
539 | int hash = rsc_hash(item); | |
540 | ||
541 | ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); | |
542 | if (ch) | |
543 | return container_of(ch, struct rsc, h); | |
544 | else | |
545 | return NULL; | |
546 | } | |
547 | ||
548 | static struct rsc *rsc_update(struct rsc *new, struct rsc *old) | |
549 | { | |
550 | struct cache_head *ch; | |
551 | int hash = rsc_hash(new); | |
552 | ||
553 | ch = sunrpc_cache_update(&rsc_cache, &new->h, | |
554 | &old->h, hash); | |
555 | if (ch) | |
556 | return container_of(ch, struct rsc, h); | |
557 | else | |
558 | return NULL; | |
559 | } | |
560 | ||
1da177e4 LT |
561 | |
562 | static struct rsc * | |
563 | gss_svc_searchbyctx(struct xdr_netobj *handle) | |
564 | { | |
565 | struct rsc rsci; | |
566 | struct rsc *found; | |
567 | ||
568 | memset(&rsci, 0, sizeof(rsci)); | |
569 | if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) | |
570 | return NULL; | |
17f834b6 | 571 | found = rsc_lookup(&rsci); |
1da177e4 LT |
572 | rsc_free(&rsci); |
573 | if (!found) | |
574 | return NULL; | |
575 | if (cache_check(&rsc_cache, &found->h, NULL)) | |
576 | return NULL; | |
577 | return found; | |
578 | } | |
579 | ||
580 | /* Implements sequence number algorithm as specified in RFC 2203. */ | |
581 | static int | |
582 | gss_check_seq_num(struct rsc *rsci, int seq_num) | |
583 | { | |
584 | struct gss_svc_seq_data *sd = &rsci->seqdata; | |
585 | ||
586 | spin_lock(&sd->sd_lock); | |
587 | if (seq_num > sd->sd_max) { | |
588 | if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { | |
589 | memset(sd->sd_win,0,sizeof(sd->sd_win)); | |
590 | sd->sd_max = seq_num; | |
591 | } else while (sd->sd_max < seq_num) { | |
592 | sd->sd_max++; | |
593 | __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); | |
594 | } | |
595 | __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); | |
596 | goto ok; | |
597 | } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { | |
598 | goto drop; | |
599 | } | |
600 | /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ | |
601 | if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) | |
602 | goto drop; | |
603 | ok: | |
604 | spin_unlock(&sd->sd_lock); | |
605 | return 1; | |
606 | drop: | |
607 | spin_unlock(&sd->sd_lock); | |
608 | return 0; | |
609 | } | |
610 | ||
611 | static inline u32 round_up_to_quad(u32 i) | |
612 | { | |
613 | return (i + 3 ) & ~3; | |
614 | } | |
615 | ||
616 | static inline int | |
617 | svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) | |
618 | { | |
619 | int l; | |
620 | ||
621 | if (argv->iov_len < 4) | |
622 | return -1; | |
76994313 | 623 | o->len = svc_getnl(argv); |
1da177e4 LT |
624 | l = round_up_to_quad(o->len); |
625 | if (argv->iov_len < l) | |
626 | return -1; | |
627 | o->data = argv->iov_base; | |
628 | argv->iov_base += l; | |
629 | argv->iov_len -= l; | |
630 | return 0; | |
631 | } | |
632 | ||
633 | static inline int | |
634 | svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) | |
635 | { | |
753ed90d | 636 | u8 *p; |
1da177e4 LT |
637 | |
638 | if (resv->iov_len + 4 > PAGE_SIZE) | |
639 | return -1; | |
76994313 | 640 | svc_putnl(resv, o->len); |
1da177e4 LT |
641 | p = resv->iov_base + resv->iov_len; |
642 | resv->iov_len += round_up_to_quad(o->len); | |
643 | if (resv->iov_len > PAGE_SIZE) | |
644 | return -1; | |
645 | memcpy(p, o->data, o->len); | |
753ed90d | 646 | memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); |
1da177e4 LT |
647 | return 0; |
648 | } | |
649 | ||
21fcd02b BF |
650 | /* |
651 | * Verify the checksum on the header and return SVC_OK on success. | |
1da177e4 LT |
652 | * Otherwise, return SVC_DROP (in the case of a bad sequence number) |
653 | * or return SVC_DENIED and indicate error in authp. | |
654 | */ | |
655 | static int | |
656 | gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, | |
d8ed029d | 657 | __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) |
1da177e4 LT |
658 | { |
659 | struct gss_ctx *ctx_id = rsci->mechctx; | |
660 | struct xdr_buf rpchdr; | |
661 | struct xdr_netobj checksum; | |
662 | u32 flavor = 0; | |
663 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
664 | struct kvec iov; | |
665 | ||
666 | /* data to compute the checksum over: */ | |
667 | iov.iov_base = rpcstart; | |
668 | iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; | |
669 | xdr_buf_from_iov(&iov, &rpchdr); | |
670 | ||
671 | *authp = rpc_autherr_badverf; | |
672 | if (argv->iov_len < 4) | |
673 | return SVC_DENIED; | |
76994313 | 674 | flavor = svc_getnl(argv); |
1da177e4 LT |
675 | if (flavor != RPC_AUTH_GSS) |
676 | return SVC_DENIED; | |
677 | if (svc_safe_getnetobj(argv, &checksum)) | |
678 | return SVC_DENIED; | |
679 | ||
680 | if (rqstp->rq_deferred) /* skip verification of revisited request */ | |
681 | return SVC_OK; | |
00fd6e14 | 682 | if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { |
1da177e4 LT |
683 | *authp = rpcsec_gsserr_credproblem; |
684 | return SVC_DENIED; | |
685 | } | |
686 | ||
687 | if (gc->gc_seq > MAXSEQ) { | |
8885cb36 CL |
688 | dprintk("RPC: svcauth_gss: discarding request with " |
689 | "large sequence number %d\n", gc->gc_seq); | |
1da177e4 LT |
690 | *authp = rpcsec_gsserr_ctxproblem; |
691 | return SVC_DENIED; | |
692 | } | |
693 | if (!gss_check_seq_num(rsci, gc->gc_seq)) { | |
8885cb36 CL |
694 | dprintk("RPC: svcauth_gss: discarding request with " |
695 | "old sequence number %d\n", gc->gc_seq); | |
1da177e4 LT |
696 | return SVC_DROP; |
697 | } | |
698 | return SVC_OK; | |
699 | } | |
700 | ||
822f1005 AA |
701 | static int |
702 | gss_write_null_verf(struct svc_rqst *rqstp) | |
703 | { | |
d8ed029d | 704 | __be32 *p; |
822f1005 | 705 | |
76994313 | 706 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); |
822f1005 AA |
707 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; |
708 | /* don't really need to check if head->iov_len > PAGE_SIZE ... */ | |
709 | *p++ = 0; | |
710 | if (!xdr_ressize_check(rqstp, p)) | |
711 | return -1; | |
712 | return 0; | |
713 | } | |
714 | ||
1da177e4 LT |
715 | static int |
716 | gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) | |
717 | { | |
d8ed029d | 718 | __be32 xdr_seq; |
1da177e4 LT |
719 | u32 maj_stat; |
720 | struct xdr_buf verf_data; | |
721 | struct xdr_netobj mic; | |
d8ed029d | 722 | __be32 *p; |
1da177e4 LT |
723 | struct kvec iov; |
724 | ||
76994313 | 725 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); |
1da177e4 LT |
726 | xdr_seq = htonl(seq); |
727 | ||
728 | iov.iov_base = &xdr_seq; | |
729 | iov.iov_len = sizeof(xdr_seq); | |
730 | xdr_buf_from_iov(&iov, &verf_data); | |
731 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; | |
732 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 733 | maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); |
1da177e4 LT |
734 | if (maj_stat != GSS_S_COMPLETE) |
735 | return -1; | |
736 | *p++ = htonl(mic.len); | |
737 | memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); | |
738 | p += XDR_QUADLEN(mic.len); | |
739 | if (!xdr_ressize_check(rqstp, p)) | |
740 | return -1; | |
741 | return 0; | |
742 | } | |
743 | ||
744 | struct gss_domain { | |
745 | struct auth_domain h; | |
746 | u32 pseudoflavor; | |
747 | }; | |
748 | ||
749 | static struct auth_domain * | |
750 | find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) | |
751 | { | |
752 | char *name; | |
753 | ||
754 | name = gss_service_to_auth_domain_name(ctx->mech_type, svc); | |
755 | if (!name) | |
756 | return NULL; | |
757 | return auth_domain_find(name); | |
758 | } | |
759 | ||
efc36aa5 N |
760 | static struct auth_ops svcauthops_gss; |
761 | ||
4796f457 BF |
762 | u32 svcauth_gss_flavor(struct auth_domain *dom) |
763 | { | |
764 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); | |
765 | ||
766 | return gd->pseudoflavor; | |
767 | } | |
768 | ||
7bd88269 | 769 | EXPORT_SYMBOL_GPL(svcauth_gss_flavor); |
4796f457 | 770 | |
1da177e4 LT |
771 | int |
772 | svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) | |
773 | { | |
774 | struct gss_domain *new; | |
775 | struct auth_domain *test; | |
776 | int stat = -ENOMEM; | |
777 | ||
778 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
779 | if (!new) | |
780 | goto out; | |
efc36aa5 | 781 | kref_init(&new->h.ref); |
e69062b4 | 782 | new->h.name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
783 | if (!new->h.name) |
784 | goto out_free_dom; | |
efc36aa5 | 785 | new->h.flavour = &svcauthops_gss; |
1da177e4 | 786 | new->pseudoflavor = pseudoflavor; |
1da177e4 | 787 | |
cb276805 | 788 | stat = 0; |
efc36aa5 | 789 | test = auth_domain_lookup(name, &new->h); |
cb276805 BF |
790 | if (test != &new->h) { /* Duplicate registration */ |
791 | auth_domain_put(test); | |
792 | kfree(new->h.name); | |
793 | goto out_free_dom; | |
1da177e4 LT |
794 | } |
795 | return 0; | |
796 | ||
797 | out_free_dom: | |
798 | kfree(new); | |
799 | out: | |
800 | return stat; | |
801 | } | |
802 | ||
7bd88269 | 803 | EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); |
1da177e4 LT |
804 | |
805 | static inline int | |
806 | read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) | |
807 | { | |
d8ed029d | 808 | __be32 raw; |
1da177e4 LT |
809 | int status; |
810 | ||
811 | status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); | |
812 | if (status) | |
813 | return status; | |
814 | *obj = ntohl(raw); | |
815 | return 0; | |
816 | } | |
817 | ||
818 | /* It would be nice if this bit of code could be shared with the client. | |
819 | * Obstacles: | |
820 | * The client shouldn't malloc(), would have to pass in own memory. | |
821 | * The server uses base of head iovec as read pointer, while the | |
822 | * client uses separate pointer. */ | |
823 | static int | |
824 | unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) | |
825 | { | |
826 | int stat = -EINVAL; | |
827 | u32 integ_len, maj_stat; | |
828 | struct xdr_netobj mic; | |
829 | struct xdr_buf integ_buf; | |
830 | ||
76994313 | 831 | integ_len = svc_getnl(&buf->head[0]); |
1da177e4 | 832 | if (integ_len & 3) |
b797b5be | 833 | return stat; |
1da177e4 | 834 | if (integ_len > buf->len) |
b797b5be | 835 | return stat; |
1da177e4 LT |
836 | if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) |
837 | BUG(); | |
838 | /* copy out mic... */ | |
839 | if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) | |
840 | BUG(); | |
841 | if (mic.len > RPC_MAX_AUTH_SIZE) | |
b797b5be | 842 | return stat; |
1da177e4 LT |
843 | mic.data = kmalloc(mic.len, GFP_KERNEL); |
844 | if (!mic.data) | |
b797b5be | 845 | return stat; |
1da177e4 LT |
846 | if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) |
847 | goto out; | |
00fd6e14 | 848 | maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); |
1da177e4 LT |
849 | if (maj_stat != GSS_S_COMPLETE) |
850 | goto out; | |
76994313 | 851 | if (svc_getnl(&buf->head[0]) != seq) |
1da177e4 LT |
852 | goto out; |
853 | stat = 0; | |
854 | out: | |
b797b5be | 855 | kfree(mic.data); |
1da177e4 LT |
856 | return stat; |
857 | } | |
858 | ||
7c9fdcfb BF |
859 | static inline int |
860 | total_buf_len(struct xdr_buf *buf) | |
861 | { | |
862 | return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; | |
863 | } | |
864 | ||
865 | static void | |
866 | fix_priv_head(struct xdr_buf *buf, int pad) | |
867 | { | |
868 | if (buf->page_len == 0) { | |
869 | /* We need to adjust head and buf->len in tandem in this | |
870 | * case to make svc_defer() work--it finds the original | |
871 | * buffer start using buf->len - buf->head[0].iov_len. */ | |
872 | buf->head[0].iov_len -= pad; | |
873 | } | |
874 | } | |
875 | ||
876 | static int | |
877 | unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) | |
878 | { | |
879 | u32 priv_len, maj_stat; | |
880 | int pad, saved_len, remaining_len, offset; | |
881 | ||
cf8208d0 | 882 | rqstp->rq_splice_ok = 0; |
7c9fdcfb | 883 | |
76994313 | 884 | priv_len = svc_getnl(&buf->head[0]); |
7c9fdcfb BF |
885 | if (rqstp->rq_deferred) { |
886 | /* Already decrypted last time through! The sequence number | |
887 | * check at out_seq is unnecessary but harmless: */ | |
888 | goto out_seq; | |
889 | } | |
890 | /* buf->len is the number of bytes from the original start of the | |
891 | * request to the end, where head[0].iov_len is just the bytes | |
892 | * not yet read from the head, so these two values are different: */ | |
893 | remaining_len = total_buf_len(buf); | |
894 | if (priv_len > remaining_len) | |
895 | return -EINVAL; | |
896 | pad = remaining_len - priv_len; | |
897 | buf->len -= pad; | |
898 | fix_priv_head(buf, pad); | |
899 | ||
900 | /* Maybe it would be better to give gss_unwrap a length parameter: */ | |
901 | saved_len = buf->len; | |
902 | buf->len = priv_len; | |
903 | maj_stat = gss_unwrap(ctx, 0, buf); | |
904 | pad = priv_len - buf->len; | |
905 | buf->len = saved_len; | |
906 | buf->len -= pad; | |
907 | /* The upper layers assume the buffer is aligned on 4-byte boundaries. | |
908 | * In the krb5p case, at least, the data ends up offset, so we need to | |
909 | * move it around. */ | |
910 | /* XXX: This is very inefficient. It would be better to either do | |
911 | * this while we encrypt, or maybe in the receive code, if we can peak | |
912 | * ahead and work out the service and mechanism there. */ | |
913 | offset = buf->head[0].iov_len % 4; | |
914 | if (offset) { | |
915 | buf->buflen = RPCSVC_MAXPAYLOAD; | |
916 | xdr_shift_buf(buf, offset); | |
917 | fix_priv_head(buf, pad); | |
918 | } | |
919 | if (maj_stat != GSS_S_COMPLETE) | |
920 | return -EINVAL; | |
921 | out_seq: | |
76994313 | 922 | if (svc_getnl(&buf->head[0]) != seq) |
7c9fdcfb BF |
923 | return -EINVAL; |
924 | return 0; | |
925 | } | |
926 | ||
1da177e4 LT |
927 | struct gss_svc_data { |
928 | /* decoded gss client cred: */ | |
929 | struct rpc_gss_wire_cred clcred; | |
5b304bc5 BF |
930 | /* save a pointer to the beginning of the encoded verifier, |
931 | * for use in encryption/checksumming in svcauth_gss_release: */ | |
932 | __be32 *verf_start; | |
1da177e4 LT |
933 | struct rsc *rsci; |
934 | }; | |
935 | ||
68e76ad0 OK |
936 | char *svc_gss_principal(struct svc_rqst *rqstp) |
937 | { | |
938 | struct gss_svc_data *gd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
939 | ||
940 | if (gd && gd->rsci) | |
941 | return gd->rsci->client_name; | |
942 | return NULL; | |
943 | } | |
945b34a7 | 944 | EXPORT_SYMBOL_GPL(svc_gss_principal); |
68e76ad0 | 945 | |
1da177e4 LT |
946 | static int |
947 | svcauth_gss_set_client(struct svc_rqst *rqstp) | |
948 | { | |
949 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; | |
950 | struct rsc *rsci = svcdata->rsci; | |
951 | struct rpc_gss_wire_cred *gc = &svcdata->clcred; | |
3ab4d8b1 | 952 | int stat; |
1da177e4 | 953 | |
3ab4d8b1 BF |
954 | /* |
955 | * A gss export can be specified either by: | |
956 | * export *(sec=krb5,rw) | |
957 | * or by | |
958 | * export gss/krb5(rw) | |
959 | * The latter is deprecated; but for backwards compatibility reasons | |
960 | * the nfsd code will still fall back on trying it if the former | |
961 | * doesn't work; so we try to make both available to nfsd, below. | |
962 | */ | |
963 | rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); | |
964 | if (rqstp->rq_gssclient == NULL) | |
1da177e4 | 965 | return SVC_DENIED; |
3ab4d8b1 BF |
966 | stat = svcauth_unix_set_client(rqstp); |
967 | if (stat == SVC_DROP) | |
968 | return stat; | |
1da177e4 LT |
969 | return SVC_OK; |
970 | } | |
971 | ||
91a4762e KC |
972 | static inline int |
973 | gss_write_init_verf(struct svc_rqst *rqstp, struct rsi *rsip) | |
974 | { | |
975 | struct rsc *rsci; | |
54f9247b | 976 | int rc; |
91a4762e KC |
977 | |
978 | if (rsip->major_status != GSS_S_COMPLETE) | |
979 | return gss_write_null_verf(rqstp); | |
980 | rsci = gss_svc_searchbyctx(&rsip->out_handle); | |
981 | if (rsci == NULL) { | |
982 | rsip->major_status = GSS_S_NO_CONTEXT; | |
983 | return gss_write_null_verf(rqstp); | |
984 | } | |
54f9247b FF |
985 | rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); |
986 | cache_put(&rsci->h, &rsc_cache); | |
987 | return rc; | |
91a4762e KC |
988 | } |
989 | ||
21fcd02b BF |
990 | /* |
991 | * Having read the cred already and found we're in the context | |
992 | * initiation case, read the verifier and initiate (or check the results | |
993 | * of) upcalls to userspace for help with context initiation. If | |
994 | * the upcall results are available, write the verifier and result. | |
995 | * Otherwise, drop the request pending an answer to the upcall. | |
996 | */ | |
997 | static int svcauth_gss_handle_init(struct svc_rqst *rqstp, | |
998 | struct rpc_gss_wire_cred *gc, __be32 *authp) | |
999 | { | |
1000 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1001 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1002 | struct xdr_netobj tmpobj; | |
1003 | struct rsi *rsip, rsikey; | |
980e5a40 | 1004 | int ret; |
21fcd02b BF |
1005 | |
1006 | /* Read the verifier; should be NULL: */ | |
1007 | *authp = rpc_autherr_badverf; | |
1008 | if (argv->iov_len < 2 * 4) | |
1009 | return SVC_DENIED; | |
1010 | if (svc_getnl(argv) != RPC_AUTH_NULL) | |
1011 | return SVC_DENIED; | |
1012 | if (svc_getnl(argv) != 0) | |
1013 | return SVC_DENIED; | |
1014 | ||
1015 | /* Martial context handle and token for upcall: */ | |
1016 | *authp = rpc_autherr_badcred; | |
1017 | if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) | |
1018 | return SVC_DENIED; | |
1019 | memset(&rsikey, 0, sizeof(rsikey)); | |
1020 | if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) | |
1021 | return SVC_DROP; | |
1022 | *authp = rpc_autherr_badverf; | |
1023 | if (svc_safe_getnetobj(argv, &tmpobj)) { | |
1024 | kfree(rsikey.in_handle.data); | |
1025 | return SVC_DENIED; | |
1026 | } | |
1027 | if (dup_netobj(&rsikey.in_token, &tmpobj)) { | |
1028 | kfree(rsikey.in_handle.data); | |
1029 | return SVC_DROP; | |
1030 | } | |
1031 | ||
1032 | /* Perform upcall, or find upcall result: */ | |
1033 | rsip = rsi_lookup(&rsikey); | |
1034 | rsi_free(&rsikey); | |
1035 | if (!rsip) | |
1036 | return SVC_DROP; | |
1037 | switch (cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) { | |
1038 | case -EAGAIN: | |
1039 | case -ETIMEDOUT: | |
1040 | case -ENOENT: | |
1041 | /* No upcall result: */ | |
1042 | return SVC_DROP; | |
1043 | case 0: | |
980e5a40 | 1044 | ret = SVC_DROP; |
21fcd02b BF |
1045 | /* Got an answer to the upcall; use it: */ |
1046 | if (gss_write_init_verf(rqstp, rsip)) | |
980e5a40 | 1047 | goto out; |
21fcd02b | 1048 | if (resv->iov_len + 4 > PAGE_SIZE) |
980e5a40 | 1049 | goto out; |
21fcd02b BF |
1050 | svc_putnl(resv, RPC_SUCCESS); |
1051 | if (svc_safe_putnetobj(resv, &rsip->out_handle)) | |
980e5a40 | 1052 | goto out; |
21fcd02b | 1053 | if (resv->iov_len + 3 * 4 > PAGE_SIZE) |
980e5a40 | 1054 | goto out; |
21fcd02b BF |
1055 | svc_putnl(resv, rsip->major_status); |
1056 | svc_putnl(resv, rsip->minor_status); | |
1057 | svc_putnl(resv, GSS_SEQ_WIN); | |
1058 | if (svc_safe_putnetobj(resv, &rsip->out_token)) | |
980e5a40 | 1059 | goto out; |
21fcd02b | 1060 | } |
980e5a40 BF |
1061 | ret = SVC_COMPLETE; |
1062 | out: | |
1063 | cache_put(&rsip->h, &rsi_cache); | |
1064 | return ret; | |
21fcd02b BF |
1065 | } |
1066 | ||
1da177e4 LT |
1067 | /* |
1068 | * Accept an rpcsec packet. | |
1069 | * If context establishment, punt to user space | |
1070 | * If data exchange, verify/decrypt | |
1071 | * If context destruction, handle here | |
1072 | * In the context establishment and destruction case we encode | |
1073 | * response here and return SVC_COMPLETE. | |
1074 | */ | |
1075 | static int | |
d8ed029d | 1076 | svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) |
1da177e4 LT |
1077 | { |
1078 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1079 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1080 | u32 crlen; | |
1da177e4 LT |
1081 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; |
1082 | struct rpc_gss_wire_cred *gc; | |
1083 | struct rsc *rsci = NULL; | |
d8ed029d AD |
1084 | __be32 *rpcstart; |
1085 | __be32 *reject_stat = resv->iov_base + resv->iov_len; | |
1da177e4 LT |
1086 | int ret; |
1087 | ||
8885cb36 CL |
1088 | dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", |
1089 | argv->iov_len); | |
1da177e4 LT |
1090 | |
1091 | *authp = rpc_autherr_badcred; | |
1092 | if (!svcdata) | |
1093 | svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); | |
1094 | if (!svcdata) | |
1095 | goto auth_err; | |
1096 | rqstp->rq_auth_data = svcdata; | |
5b304bc5 | 1097 | svcdata->verf_start = NULL; |
1da177e4 LT |
1098 | svcdata->rsci = NULL; |
1099 | gc = &svcdata->clcred; | |
1100 | ||
1101 | /* start of rpc packet is 7 u32's back from here: | |
1102 | * xid direction rpcversion prog vers proc flavour | |
1103 | */ | |
1104 | rpcstart = argv->iov_base; | |
1105 | rpcstart -= 7; | |
1106 | ||
1107 | /* credential is: | |
1108 | * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle | |
1109 | * at least 5 u32s, and is preceeded by length, so that makes 6. | |
1110 | */ | |
1111 | ||
1112 | if (argv->iov_len < 5 * 4) | |
1113 | goto auth_err; | |
76994313 AD |
1114 | crlen = svc_getnl(argv); |
1115 | if (svc_getnl(argv) != RPC_GSS_VERSION) | |
1da177e4 | 1116 | goto auth_err; |
76994313 AD |
1117 | gc->gc_proc = svc_getnl(argv); |
1118 | gc->gc_seq = svc_getnl(argv); | |
1119 | gc->gc_svc = svc_getnl(argv); | |
1da177e4 LT |
1120 | if (svc_safe_getnetobj(argv, &gc->gc_ctx)) |
1121 | goto auth_err; | |
1122 | if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) | |
1123 | goto auth_err; | |
1124 | ||
1125 | if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) | |
1126 | goto auth_err; | |
1127 | ||
1da177e4 LT |
1128 | *authp = rpc_autherr_badverf; |
1129 | switch (gc->gc_proc) { | |
1130 | case RPC_GSS_PROC_INIT: | |
1131 | case RPC_GSS_PROC_CONTINUE_INIT: | |
21fcd02b | 1132 | return svcauth_gss_handle_init(rqstp, gc, authp); |
1da177e4 LT |
1133 | case RPC_GSS_PROC_DATA: |
1134 | case RPC_GSS_PROC_DESTROY: | |
21fcd02b | 1135 | /* Look up the context, and check the verifier: */ |
1da177e4 LT |
1136 | *authp = rpcsec_gsserr_credproblem; |
1137 | rsci = gss_svc_searchbyctx(&gc->gc_ctx); | |
1138 | if (!rsci) | |
1139 | goto auth_err; | |
1140 | switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { | |
1141 | case SVC_OK: | |
1142 | break; | |
1143 | case SVC_DENIED: | |
1144 | goto auth_err; | |
1145 | case SVC_DROP: | |
1146 | goto drop; | |
1147 | } | |
1148 | break; | |
1149 | default: | |
1150 | *authp = rpc_autherr_rejectedcred; | |
1151 | goto auth_err; | |
1152 | } | |
1153 | ||
1154 | /* now act upon the command: */ | |
1155 | switch (gc->gc_proc) { | |
1da177e4 | 1156 | case RPC_GSS_PROC_DESTROY: |
c5e434c9 WY |
1157 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
1158 | goto auth_err; | |
cb5c7d66 | 1159 | rsci->h.expiry_time = get_seconds(); |
1da177e4 LT |
1160 | set_bit(CACHE_NEGATIVE, &rsci->h.flags); |
1161 | if (resv->iov_len + 4 > PAGE_SIZE) | |
1162 | goto drop; | |
76994313 | 1163 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 LT |
1164 | goto complete; |
1165 | case RPC_GSS_PROC_DATA: | |
1166 | *authp = rpcsec_gsserr_ctxproblem; | |
5b304bc5 | 1167 | svcdata->verf_start = resv->iov_base + resv->iov_len; |
1da177e4 LT |
1168 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
1169 | goto auth_err; | |
1170 | rqstp->rq_cred = rsci->cred; | |
1171 | get_group_info(rsci->cred.cr_group_info); | |
1172 | *authp = rpc_autherr_badcred; | |
1173 | switch (gc->gc_svc) { | |
1174 | case RPC_GSS_SVC_NONE: | |
1175 | break; | |
1176 | case RPC_GSS_SVC_INTEGRITY: | |
b620754b BF |
1177 | /* placeholders for length and seq. number: */ |
1178 | svc_putnl(resv, 0); | |
1179 | svc_putnl(resv, 0); | |
1da177e4 LT |
1180 | if (unwrap_integ_data(&rqstp->rq_arg, |
1181 | gc->gc_seq, rsci->mechctx)) | |
dd35210e | 1182 | goto garbage_args; |
b620754b BF |
1183 | break; |
1184 | case RPC_GSS_SVC_PRIVACY: | |
1da177e4 | 1185 | /* placeholders for length and seq. number: */ |
76994313 AD |
1186 | svc_putnl(resv, 0); |
1187 | svc_putnl(resv, 0); | |
7c9fdcfb BF |
1188 | if (unwrap_priv_data(rqstp, &rqstp->rq_arg, |
1189 | gc->gc_seq, rsci->mechctx)) | |
dd35210e | 1190 | goto garbage_args; |
7c9fdcfb | 1191 | break; |
1da177e4 LT |
1192 | default: |
1193 | goto auth_err; | |
1194 | } | |
1195 | svcdata->rsci = rsci; | |
1196 | cache_get(&rsci->h); | |
c4170583 AA |
1197 | rqstp->rq_flavor = gss_svc_to_pseudoflavor( |
1198 | rsci->mechctx->mech_type, gc->gc_svc); | |
1da177e4 LT |
1199 | ret = SVC_OK; |
1200 | goto out; | |
1201 | } | |
dd35210e | 1202 | garbage_args: |
dd35210e HJ |
1203 | ret = SVC_GARBAGE; |
1204 | goto out; | |
1da177e4 | 1205 | auth_err: |
21fcd02b | 1206 | /* Restore write pointer to its original value: */ |
1da177e4 LT |
1207 | xdr_ressize_check(rqstp, reject_stat); |
1208 | ret = SVC_DENIED; | |
1209 | goto out; | |
1210 | complete: | |
1211 | ret = SVC_COMPLETE; | |
1212 | goto out; | |
1213 | drop: | |
1214 | ret = SVC_DROP; | |
1215 | out: | |
1216 | if (rsci) | |
baab935f | 1217 | cache_put(&rsci->h, &rsc_cache); |
1da177e4 LT |
1218 | return ret; |
1219 | } | |
1220 | ||
cfbdbab0 | 1221 | static __be32 * |
3c15a486 BF |
1222 | svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) |
1223 | { | |
cfbdbab0 AV |
1224 | __be32 *p; |
1225 | u32 verf_len; | |
3c15a486 | 1226 | |
5b304bc5 BF |
1227 | p = gsd->verf_start; |
1228 | gsd->verf_start = NULL; | |
1229 | ||
1230 | /* If the reply stat is nonzero, don't wrap: */ | |
1231 | if (*(p-1) != rpc_success) | |
1232 | return NULL; | |
1233 | /* Skip the verifier: */ | |
1234 | p += 1; | |
1235 | verf_len = ntohl(*p++); | |
1236 | p += XDR_QUADLEN(verf_len); | |
3c15a486 BF |
1237 | /* move accept_stat to right place: */ |
1238 | memcpy(p, p + 2, 4); | |
5b304bc5 | 1239 | /* Also don't wrap if the accept stat is nonzero: */ |
3c15a486 BF |
1240 | if (*p != rpc_success) { |
1241 | resbuf->head[0].iov_len -= 2 * 4; | |
1242 | return NULL; | |
1243 | } | |
1244 | p++; | |
1245 | return p; | |
1246 | } | |
1247 | ||
e142ede8 BF |
1248 | static inline int |
1249 | svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) | |
1da177e4 LT |
1250 | { |
1251 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1252 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1253 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1254 | struct xdr_buf integ_buf; | |
1255 | struct xdr_netobj mic; | |
1256 | struct kvec *resv; | |
d8ed029d | 1257 | __be32 *p; |
1da177e4 LT |
1258 | int integ_offset, integ_len; |
1259 | int stat = -EINVAL; | |
1260 | ||
3c15a486 BF |
1261 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
1262 | if (p == NULL) | |
e142ede8 | 1263 | goto out; |
e142ede8 BF |
1264 | integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; |
1265 | integ_len = resbuf->len - integ_offset; | |
1266 | BUG_ON(integ_len % 4); | |
1267 | *p++ = htonl(integ_len); | |
1268 | *p++ = htonl(gc->gc_seq); | |
1269 | if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, | |
1270 | integ_len)) | |
1271 | BUG(); | |
153e44d2 | 1272 | if (resbuf->tail[0].iov_base == NULL) { |
e142ede8 BF |
1273 | if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) |
1274 | goto out_err; | |
1275 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base | |
1276 | + resbuf->head[0].iov_len; | |
1277 | resbuf->tail[0].iov_len = 0; | |
e142ede8 BF |
1278 | resv = &resbuf->tail[0]; |
1279 | } else { | |
1280 | resv = &resbuf->tail[0]; | |
1281 | } | |
1282 | mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; | |
1283 | if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) | |
1284 | goto out_err; | |
76994313 | 1285 | svc_putnl(resv, mic.len); |
e142ede8 BF |
1286 | memset(mic.data + mic.len, 0, |
1287 | round_up_to_quad(mic.len) - mic.len); | |
1288 | resv->iov_len += XDR_QUADLEN(mic.len) << 2; | |
1289 | /* not strictly required: */ | |
1290 | resbuf->len += XDR_QUADLEN(mic.len) << 2; | |
1291 | BUG_ON(resv->iov_len > PAGE_SIZE); | |
1292 | out: | |
1293 | stat = 0; | |
1294 | out_err: | |
1295 | return stat; | |
1296 | } | |
1297 | ||
7c9fdcfb BF |
1298 | static inline int |
1299 | svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) | |
1300 | { | |
1301 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1302 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1303 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1304 | struct page **inpages = NULL; | |
753ed90d AV |
1305 | __be32 *p, *len; |
1306 | int offset; | |
7c9fdcfb BF |
1307 | int pad; |
1308 | ||
3c15a486 BF |
1309 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
1310 | if (p == NULL) | |
7c9fdcfb | 1311 | return 0; |
7c9fdcfb BF |
1312 | len = p++; |
1313 | offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; | |
1314 | *p++ = htonl(gc->gc_seq); | |
1315 | inpages = resbuf->pages; | |
1316 | /* XXX: Would be better to write some xdr helper functions for | |
1317 | * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ | |
7561042f KC |
1318 | |
1319 | /* | |
1320 | * If there is currently tail data, make sure there is | |
1321 | * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in | |
1322 | * the page, and move the current tail data such that | |
1323 | * there is RPC_MAX_AUTH_SIZE slack space available in | |
1324 | * both the head and tail. | |
1325 | */ | |
44524359 | 1326 | if (resbuf->tail[0].iov_base) { |
7c9fdcfb BF |
1327 | BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base |
1328 | + PAGE_SIZE); | |
1329 | BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); | |
1330 | if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len | |
1331 | + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) | |
1332 | return -ENOMEM; | |
1333 | memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, | |
1334 | resbuf->tail[0].iov_base, | |
1335 | resbuf->tail[0].iov_len); | |
1336 | resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; | |
1337 | } | |
7561042f KC |
1338 | /* |
1339 | * If there is no current tail data, make sure there is | |
1340 | * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the | |
1341 | * allotted page, and set up tail information such that there | |
1342 | * is RPC_MAX_AUTH_SIZE slack space available in both the | |
1343 | * head and tail. | |
1344 | */ | |
7c9fdcfb BF |
1345 | if (resbuf->tail[0].iov_base == NULL) { |
1346 | if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) | |
1347 | return -ENOMEM; | |
1348 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base | |
1349 | + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; | |
1350 | resbuf->tail[0].iov_len = 0; | |
7c9fdcfb BF |
1351 | } |
1352 | if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) | |
1353 | return -ENOMEM; | |
1354 | *len = htonl(resbuf->len - offset); | |
1355 | pad = 3 - ((resbuf->len - offset - 1)&3); | |
d8ed029d | 1356 | p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); |
7c9fdcfb BF |
1357 | memset(p, 0, pad); |
1358 | resbuf->tail[0].iov_len += pad; | |
1359 | resbuf->len += pad; | |
1360 | return 0; | |
1361 | } | |
1362 | ||
e142ede8 BF |
1363 | static int |
1364 | svcauth_gss_release(struct svc_rqst *rqstp) | |
1365 | { | |
1366 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1367 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1368 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1369 | int stat = -EINVAL; | |
1370 | ||
1da177e4 LT |
1371 | if (gc->gc_proc != RPC_GSS_PROC_DATA) |
1372 | goto out; | |
1373 | /* Release can be called twice, but we only wrap once. */ | |
5b304bc5 | 1374 | if (gsd->verf_start == NULL) |
1da177e4 LT |
1375 | goto out; |
1376 | /* normally not set till svc_send, but we need it here: */ | |
7c9fdcfb BF |
1377 | /* XXX: what for? Do we mess it up the moment we call svc_putu32 |
1378 | * or whatever? */ | |
1379 | resbuf->len = total_buf_len(resbuf); | |
1da177e4 LT |
1380 | switch (gc->gc_svc) { |
1381 | case RPC_GSS_SVC_NONE: | |
1382 | break; | |
1383 | case RPC_GSS_SVC_INTEGRITY: | |
7c9fdcfb BF |
1384 | stat = svcauth_gss_wrap_resp_integ(rqstp); |
1385 | if (stat) | |
1386 | goto out_err; | |
1da177e4 LT |
1387 | break; |
1388 | case RPC_GSS_SVC_PRIVACY: | |
7c9fdcfb BF |
1389 | stat = svcauth_gss_wrap_resp_priv(rqstp); |
1390 | if (stat) | |
1391 | goto out_err; | |
1392 | break; | |
eac81736 WY |
1393 | /* |
1394 | * For any other gc_svc value, svcauth_gss_accept() already set | |
1395 | * the auth_error appropriately; just fall through: | |
1396 | */ | |
1da177e4 LT |
1397 | } |
1398 | ||
1399 | out: | |
1400 | stat = 0; | |
1401 | out_err: | |
1402 | if (rqstp->rq_client) | |
1403 | auth_domain_put(rqstp->rq_client); | |
1404 | rqstp->rq_client = NULL; | |
3ab4d8b1 BF |
1405 | if (rqstp->rq_gssclient) |
1406 | auth_domain_put(rqstp->rq_gssclient); | |
1407 | rqstp->rq_gssclient = NULL; | |
1da177e4 LT |
1408 | if (rqstp->rq_cred.cr_group_info) |
1409 | put_group_info(rqstp->rq_cred.cr_group_info); | |
1410 | rqstp->rq_cred.cr_group_info = NULL; | |
1411 | if (gsd->rsci) | |
baab935f | 1412 | cache_put(&gsd->rsci->h, &rsc_cache); |
1da177e4 LT |
1413 | gsd->rsci = NULL; |
1414 | ||
1415 | return stat; | |
1416 | } | |
1417 | ||
1418 | static void | |
1419 | svcauth_gss_domain_release(struct auth_domain *dom) | |
1420 | { | |
1421 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); | |
1422 | ||
1423 | kfree(dom->name); | |
1424 | kfree(gd); | |
1425 | } | |
1426 | ||
1427 | static struct auth_ops svcauthops_gss = { | |
1428 | .name = "rpcsec_gss", | |
1429 | .owner = THIS_MODULE, | |
1430 | .flavour = RPC_AUTH_GSS, | |
1431 | .accept = svcauth_gss_accept, | |
1432 | .release = svcauth_gss_release, | |
1433 | .domain_release = svcauth_gss_domain_release, | |
1434 | .set_client = svcauth_gss_set_client, | |
1435 | }; | |
1436 | ||
1437 | int | |
1438 | gss_svc_init(void) | |
1439 | { | |
1440 | int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); | |
dbf847ec BF |
1441 | if (rv) |
1442 | return rv; | |
1443 | rv = cache_register(&rsc_cache); | |
1444 | if (rv) | |
1445 | goto out1; | |
1446 | rv = cache_register(&rsi_cache); | |
1447 | if (rv) | |
1448 | goto out2; | |
1449 | return 0; | |
1450 | out2: | |
1451 | cache_unregister(&rsc_cache); | |
1452 | out1: | |
1453 | svc_auth_unregister(RPC_AUTH_GSS); | |
1da177e4 LT |
1454 | return rv; |
1455 | } | |
1456 | ||
1457 | void | |
1458 | gss_svc_shutdown(void) | |
1459 | { | |
df95a9d4 BF |
1460 | cache_unregister(&rsc_cache); |
1461 | cache_unregister(&rsi_cache); | |
1da177e4 LT |
1462 | svc_auth_unregister(RPC_AUTH_GSS); |
1463 | } |