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> | |
ae2975bc | 44 | #include <linux/user_namespace.h> |
1da177e4 LT |
45 | |
46 | #include <linux/sunrpc/auth_gss.h> | |
1da177e4 LT |
47 | #include <linux/sunrpc/gss_err.h> |
48 | #include <linux/sunrpc/svcauth.h> | |
49 | #include <linux/sunrpc/svcauth_gss.h> | |
50 | #include <linux/sunrpc/cache.h> | |
030d794b | 51 | #include "gss_rpc_upcall.h" |
1da177e4 | 52 | |
a1db410d | 53 | |
1da177e4 LT |
54 | #ifdef RPC_DEBUG |
55 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
56 | #endif | |
57 | ||
58 | /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests | |
59 | * into replies. | |
60 | * | |
61 | * Key is context handle (\x if empty) and gss_token. | |
62 | * Content is major_status minor_status (integers) context_handle, reply_token. | |
63 | * | |
64 | */ | |
65 | ||
66 | static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) | |
67 | { | |
68 | return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); | |
69 | } | |
70 | ||
71 | #define RSI_HASHBITS 6 | |
72 | #define RSI_HASHMAX (1<<RSI_HASHBITS) | |
1da177e4 LT |
73 | |
74 | struct rsi { | |
75 | struct cache_head h; | |
76 | struct xdr_netobj in_handle, in_token; | |
77 | struct xdr_netobj out_handle, out_token; | |
78 | int major_status, minor_status; | |
79 | }; | |
80 | ||
a1db410d SK |
81 | static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old); |
82 | static struct rsi *rsi_lookup(struct cache_detail *cd, 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 | ||
1da177e4 | 185 | static int rsi_parse(struct cache_detail *cd, |
cca5172a | 186 | char *mesg, int mlen) |
1da177e4 LT |
187 | { |
188 | /* context token expiry major minor context token */ | |
189 | char *buf = mesg; | |
190 | char *ep; | |
191 | int len; | |
192 | struct rsi rsii, *rsip = NULL; | |
193 | time_t expiry; | |
194 | int status = -EINVAL; | |
195 | ||
196 | memset(&rsii, 0, sizeof(rsii)); | |
197 | /* handle */ | |
198 | len = qword_get(&mesg, buf, mlen); | |
199 | if (len < 0) | |
200 | goto out; | |
201 | status = -ENOMEM; | |
202 | if (dup_to_netobj(&rsii.in_handle, buf, len)) | |
203 | goto out; | |
204 | ||
205 | /* token */ | |
206 | len = qword_get(&mesg, buf, mlen); | |
207 | status = -EINVAL; | |
208 | if (len < 0) | |
209 | goto out; | |
210 | status = -ENOMEM; | |
211 | if (dup_to_netobj(&rsii.in_token, buf, len)) | |
212 | goto out; | |
213 | ||
a1db410d | 214 | rsip = rsi_lookup(cd, &rsii); |
d4d11ea9 N |
215 | if (!rsip) |
216 | goto out; | |
217 | ||
1da177e4 LT |
218 | rsii.h.flags = 0; |
219 | /* expiry */ | |
220 | expiry = get_expiry(&mesg); | |
221 | status = -EINVAL; | |
222 | if (expiry == 0) | |
223 | goto out; | |
224 | ||
225 | /* major/minor */ | |
226 | len = qword_get(&mesg, buf, mlen); | |
b39c18fc BF |
227 | if (len <= 0) |
228 | goto out; | |
229 | rsii.major_status = simple_strtoul(buf, &ep, 10); | |
230 | if (*ep) | |
231 | goto out; | |
232 | len = qword_get(&mesg, buf, mlen); | |
233 | if (len <= 0) | |
1da177e4 | 234 | goto out; |
b39c18fc BF |
235 | rsii.minor_status = simple_strtoul(buf, &ep, 10); |
236 | if (*ep) | |
1da177e4 | 237 | goto out; |
1da177e4 | 238 | |
b39c18fc BF |
239 | /* out_handle */ |
240 | len = qword_get(&mesg, buf, mlen); | |
241 | if (len < 0) | |
242 | goto out; | |
243 | status = -ENOMEM; | |
244 | if (dup_to_netobj(&rsii.out_handle, buf, len)) | |
245 | goto out; | |
1da177e4 | 246 | |
b39c18fc BF |
247 | /* out_token */ |
248 | len = qword_get(&mesg, buf, mlen); | |
249 | status = -EINVAL; | |
250 | if (len < 0) | |
251 | goto out; | |
252 | status = -ENOMEM; | |
253 | if (dup_to_netobj(&rsii.out_token, buf, len)) | |
254 | goto out; | |
1da177e4 | 255 | rsii.h.expiry_time = expiry; |
a1db410d | 256 | rsip = rsi_update(cd, &rsii, rsip); |
1da177e4 LT |
257 | status = 0; |
258 | out: | |
259 | rsi_free(&rsii); | |
260 | if (rsip) | |
a1db410d | 261 | cache_put(&rsip->h, cd); |
d4d11ea9 N |
262 | else |
263 | status = -ENOMEM; | |
1da177e4 LT |
264 | return status; |
265 | } | |
266 | ||
a1db410d | 267 | static struct cache_detail rsi_cache_template = { |
f35279d3 | 268 | .owner = THIS_MODULE, |
1da177e4 | 269 | .hash_size = RSI_HASHMAX, |
1da177e4 LT |
270 | .name = "auth.rpcsec.init", |
271 | .cache_put = rsi_put, | |
73fb847a | 272 | .cache_request = rsi_request, |
1da177e4 | 273 | .cache_parse = rsi_parse, |
d4d11ea9 N |
274 | .match = rsi_match, |
275 | .init = rsi_init, | |
276 | .update = update_rsi, | |
277 | .alloc = rsi_alloc, | |
1da177e4 LT |
278 | }; |
279 | ||
a1db410d | 280 | static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) |
d4d11ea9 N |
281 | { |
282 | struct cache_head *ch; | |
283 | int hash = rsi_hash(item); | |
284 | ||
a1db410d | 285 | ch = sunrpc_cache_lookup(cd, &item->h, hash); |
d4d11ea9 N |
286 | if (ch) |
287 | return container_of(ch, struct rsi, h); | |
288 | else | |
289 | return NULL; | |
290 | } | |
291 | ||
a1db410d | 292 | static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) |
d4d11ea9 N |
293 | { |
294 | struct cache_head *ch; | |
295 | int hash = rsi_hash(new); | |
296 | ||
a1db410d | 297 | ch = sunrpc_cache_update(cd, &new->h, |
d4d11ea9 N |
298 | &old->h, hash); |
299 | if (ch) | |
300 | return container_of(ch, struct rsi, h); | |
301 | else | |
302 | return NULL; | |
303 | } | |
304 | ||
1da177e4 LT |
305 | |
306 | /* | |
307 | * The rpcsec_context cache is used to store a context that is | |
308 | * used in data exchange. | |
309 | * The key is a context handle. The content is: | |
310 | * uid, gidlist, mechanism, service-set, mech-specific-data | |
311 | */ | |
312 | ||
313 | #define RSC_HASHBITS 10 | |
314 | #define RSC_HASHMAX (1<<RSC_HASHBITS) | |
1da177e4 LT |
315 | |
316 | #define GSS_SEQ_WIN 128 | |
317 | ||
318 | struct gss_svc_seq_data { | |
319 | /* highest seq number seen so far: */ | |
320 | int sd_max; | |
321 | /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of | |
322 | * sd_win is nonzero iff sequence number i has been seen already: */ | |
323 | unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; | |
324 | spinlock_t sd_lock; | |
325 | }; | |
326 | ||
327 | struct rsc { | |
328 | struct cache_head h; | |
329 | struct xdr_netobj handle; | |
330 | struct svc_cred cred; | |
331 | struct gss_svc_seq_data seqdata; | |
332 | struct gss_ctx *mechctx; | |
333 | }; | |
334 | ||
a1db410d SK |
335 | static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); |
336 | static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item); | |
1da177e4 LT |
337 | |
338 | static void rsc_free(struct rsc *rsci) | |
339 | { | |
340 | kfree(rsci->handle.data); | |
341 | if (rsci->mechctx) | |
342 | gss_delete_sec_context(&rsci->mechctx); | |
03a4e1f6 | 343 | free_svc_cred(&rsci->cred); |
1da177e4 LT |
344 | } |
345 | ||
baab935f | 346 | static void rsc_put(struct kref *ref) |
1da177e4 | 347 | { |
baab935f | 348 | struct rsc *rsci = container_of(ref, struct rsc, h.ref); |
1da177e4 | 349 | |
baab935f N |
350 | rsc_free(rsci); |
351 | kfree(rsci); | |
1da177e4 LT |
352 | } |
353 | ||
354 | static inline int | |
355 | rsc_hash(struct rsc *rsci) | |
356 | { | |
357 | return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); | |
358 | } | |
359 | ||
17f834b6 N |
360 | static int |
361 | rsc_match(struct cache_head *a, struct cache_head *b) | |
1da177e4 | 362 | { |
17f834b6 N |
363 | struct rsc *new = container_of(a, struct rsc, h); |
364 | struct rsc *tmp = container_of(b, struct rsc, h); | |
365 | ||
1da177e4 LT |
366 | return netobj_equal(&new->handle, &tmp->handle); |
367 | } | |
368 | ||
17f834b6 N |
369 | static void |
370 | rsc_init(struct cache_head *cnew, struct cache_head *ctmp) | |
1da177e4 | 371 | { |
17f834b6 N |
372 | struct rsc *new = container_of(cnew, struct rsc, h); |
373 | struct rsc *tmp = container_of(ctmp, struct rsc, h); | |
374 | ||
1da177e4 LT |
375 | new->handle.len = tmp->handle.len; |
376 | tmp->handle.len = 0; | |
377 | new->handle.data = tmp->handle.data; | |
378 | tmp->handle.data = NULL; | |
379 | new->mechctx = NULL; | |
380 | new->cred.cr_group_info = NULL; | |
03a4e1f6 | 381 | new->cred.cr_principal = NULL; |
1da177e4 LT |
382 | } |
383 | ||
17f834b6 N |
384 | static void |
385 | update_rsc(struct cache_head *cnew, struct cache_head *ctmp) | |
1da177e4 | 386 | { |
17f834b6 N |
387 | struct rsc *new = container_of(cnew, struct rsc, h); |
388 | struct rsc *tmp = container_of(ctmp, struct rsc, h); | |
389 | ||
1da177e4 LT |
390 | new->mechctx = tmp->mechctx; |
391 | tmp->mechctx = NULL; | |
392 | memset(&new->seqdata, 0, sizeof(new->seqdata)); | |
393 | spin_lock_init(&new->seqdata.sd_lock); | |
394 | new->cred = tmp->cred; | |
395 | tmp->cred.cr_group_info = NULL; | |
03a4e1f6 BF |
396 | new->cred.cr_principal = tmp->cred.cr_principal; |
397 | tmp->cred.cr_principal = NULL; | |
1da177e4 LT |
398 | } |
399 | ||
17f834b6 N |
400 | static struct cache_head * |
401 | rsc_alloc(void) | |
402 | { | |
403 | struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); | |
404 | if (rsci) | |
405 | return &rsci->h; | |
406 | else | |
407 | return NULL; | |
408 | } | |
409 | ||
1da177e4 LT |
410 | static int rsc_parse(struct cache_detail *cd, |
411 | char *mesg, int mlen) | |
412 | { | |
413 | /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ | |
414 | char *buf = mesg; | |
683428fa | 415 | int id; |
1da177e4 LT |
416 | int len, rv; |
417 | struct rsc rsci, *rscp = NULL; | |
418 | time_t expiry; | |
419 | int status = -EINVAL; | |
1df0cada | 420 | struct gss_api_mech *gm = NULL; |
1da177e4 LT |
421 | |
422 | memset(&rsci, 0, sizeof(rsci)); | |
423 | /* context handle */ | |
424 | len = qword_get(&mesg, buf, mlen); | |
425 | if (len < 0) goto out; | |
426 | status = -ENOMEM; | |
427 | if (dup_to_netobj(&rsci.handle, buf, len)) | |
428 | goto out; | |
429 | ||
430 | rsci.h.flags = 0; | |
431 | /* expiry */ | |
432 | expiry = get_expiry(&mesg); | |
433 | status = -EINVAL; | |
434 | if (expiry == 0) | |
435 | goto out; | |
436 | ||
a1db410d | 437 | rscp = rsc_lookup(cd, &rsci); |
17f834b6 N |
438 | if (!rscp) |
439 | goto out; | |
440 | ||
1da177e4 | 441 | /* uid, or NEGATIVE */ |
683428fa | 442 | rv = get_int(&mesg, &id); |
1da177e4 LT |
443 | if (rv == -EINVAL) |
444 | goto out; | |
445 | if (rv == -ENOENT) | |
446 | set_bit(CACHE_NEGATIVE, &rsci.h.flags); | |
447 | else { | |
448 | int N, i; | |
1da177e4 | 449 | |
3c34ae11 BF |
450 | /* |
451 | * NOTE: we skip uid_valid()/gid_valid() checks here: | |
452 | * instead, * -1 id's are later mapped to the | |
453 | * (export-specific) anonymous id by nfsd_setuser. | |
454 | * | |
455 | * (But supplementary gid's get no such special | |
456 | * treatment so are checked for validity here.) | |
457 | */ | |
683428fa EB |
458 | /* uid */ |
459 | rsci.cred.cr_uid = make_kuid(&init_user_ns, id); | |
683428fa | 460 | |
1da177e4 | 461 | /* gid */ |
683428fa EB |
462 | if (get_int(&mesg, &id)) |
463 | goto out; | |
464 | rsci.cred.cr_gid = make_kgid(&init_user_ns, id); | |
1da177e4 LT |
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++) { | |
ae2975bc | 477 | kgid_t kgid; |
683428fa | 478 | if (get_int(&mesg, &id)) |
1da177e4 | 479 | goto out; |
683428fa | 480 | kgid = make_kgid(&init_user_ns, id); |
ae2975bc EB |
481 | if (!gid_valid(kgid)) |
482 | goto out; | |
483 | GROUP_AT(rsci.cred.cr_group_info, i) = kgid; | |
1da177e4 LT |
484 | } |
485 | ||
486 | /* mech name */ | |
487 | len = qword_get(&mesg, buf, mlen); | |
488 | if (len < 0) | |
489 | goto out; | |
490 | gm = gss_mech_get_by_name(buf); | |
491 | status = -EOPNOTSUPP; | |
492 | if (!gm) | |
493 | goto out; | |
494 | ||
495 | status = -EINVAL; | |
496 | /* mech-specific data: */ | |
497 | len = qword_get(&mesg, buf, mlen); | |
1df0cada | 498 | if (len < 0) |
1da177e4 | 499 | goto out; |
400f26b5 SS |
500 | status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, |
501 | NULL, GFP_KERNEL); | |
1df0cada | 502 | if (status) |
1da177e4 | 503 | goto out; |
68e76ad0 OK |
504 | |
505 | /* get client name */ | |
506 | len = qword_get(&mesg, buf, mlen); | |
507 | if (len > 0) { | |
03a4e1f6 BF |
508 | rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); |
509 | if (!rsci.cred.cr_principal) | |
68e76ad0 OK |
510 | goto out; |
511 | } | |
512 | ||
1da177e4 LT |
513 | } |
514 | rsci.h.expiry_time = expiry; | |
a1db410d | 515 | rscp = rsc_update(cd, &rsci, rscp); |
1da177e4 LT |
516 | status = 0; |
517 | out: | |
1df0cada | 518 | gss_mech_put(gm); |
1da177e4 LT |
519 | rsc_free(&rsci); |
520 | if (rscp) | |
a1db410d | 521 | cache_put(&rscp->h, cd); |
17f834b6 N |
522 | else |
523 | status = -ENOMEM; | |
1da177e4 LT |
524 | return status; |
525 | } | |
526 | ||
a1db410d | 527 | static struct cache_detail rsc_cache_template = { |
f35279d3 | 528 | .owner = THIS_MODULE, |
1da177e4 | 529 | .hash_size = RSC_HASHMAX, |
1da177e4 LT |
530 | .name = "auth.rpcsec.context", |
531 | .cache_put = rsc_put, | |
532 | .cache_parse = rsc_parse, | |
17f834b6 N |
533 | .match = rsc_match, |
534 | .init = rsc_init, | |
535 | .update = update_rsc, | |
536 | .alloc = rsc_alloc, | |
1da177e4 LT |
537 | }; |
538 | ||
a1db410d | 539 | static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) |
17f834b6 N |
540 | { |
541 | struct cache_head *ch; | |
542 | int hash = rsc_hash(item); | |
543 | ||
a1db410d | 544 | ch = sunrpc_cache_lookup(cd, &item->h, hash); |
17f834b6 N |
545 | if (ch) |
546 | return container_of(ch, struct rsc, h); | |
547 | else | |
548 | return NULL; | |
549 | } | |
550 | ||
a1db410d | 551 | static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) |
17f834b6 N |
552 | { |
553 | struct cache_head *ch; | |
554 | int hash = rsc_hash(new); | |
555 | ||
a1db410d | 556 | ch = sunrpc_cache_update(cd, &new->h, |
17f834b6 N |
557 | &old->h, hash); |
558 | if (ch) | |
559 | return container_of(ch, struct rsc, h); | |
560 | else | |
561 | return NULL; | |
562 | } | |
563 | ||
1da177e4 LT |
564 | |
565 | static struct rsc * | |
a1db410d | 566 | gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) |
1da177e4 LT |
567 | { |
568 | struct rsc rsci; | |
569 | struct rsc *found; | |
570 | ||
571 | memset(&rsci, 0, sizeof(rsci)); | |
572 | if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) | |
573 | return NULL; | |
a1db410d | 574 | found = rsc_lookup(cd, &rsci); |
1da177e4 LT |
575 | rsc_free(&rsci); |
576 | if (!found) | |
577 | return NULL; | |
a1db410d | 578 | if (cache_check(cd, &found->h, NULL)) |
1da177e4 LT |
579 | return NULL; |
580 | return found; | |
581 | } | |
582 | ||
583 | /* Implements sequence number algorithm as specified in RFC 2203. */ | |
584 | static int | |
585 | gss_check_seq_num(struct rsc *rsci, int seq_num) | |
586 | { | |
587 | struct gss_svc_seq_data *sd = &rsci->seqdata; | |
588 | ||
589 | spin_lock(&sd->sd_lock); | |
590 | if (seq_num > sd->sd_max) { | |
591 | if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { | |
592 | memset(sd->sd_win,0,sizeof(sd->sd_win)); | |
593 | sd->sd_max = seq_num; | |
594 | } else while (sd->sd_max < seq_num) { | |
595 | sd->sd_max++; | |
596 | __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); | |
597 | } | |
598 | __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); | |
599 | goto ok; | |
600 | } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { | |
601 | goto drop; | |
602 | } | |
603 | /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ | |
604 | if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) | |
605 | goto drop; | |
606 | ok: | |
607 | spin_unlock(&sd->sd_lock); | |
608 | return 1; | |
609 | drop: | |
610 | spin_unlock(&sd->sd_lock); | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static inline u32 round_up_to_quad(u32 i) | |
615 | { | |
616 | return (i + 3 ) & ~3; | |
617 | } | |
618 | ||
619 | static inline int | |
620 | svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) | |
621 | { | |
622 | int l; | |
623 | ||
624 | if (argv->iov_len < 4) | |
625 | return -1; | |
76994313 | 626 | o->len = svc_getnl(argv); |
1da177e4 LT |
627 | l = round_up_to_quad(o->len); |
628 | if (argv->iov_len < l) | |
629 | return -1; | |
630 | o->data = argv->iov_base; | |
631 | argv->iov_base += l; | |
632 | argv->iov_len -= l; | |
633 | return 0; | |
634 | } | |
635 | ||
636 | static inline int | |
637 | svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) | |
638 | { | |
753ed90d | 639 | u8 *p; |
1da177e4 LT |
640 | |
641 | if (resv->iov_len + 4 > PAGE_SIZE) | |
642 | return -1; | |
76994313 | 643 | svc_putnl(resv, o->len); |
1da177e4 LT |
644 | p = resv->iov_base + resv->iov_len; |
645 | resv->iov_len += round_up_to_quad(o->len); | |
646 | if (resv->iov_len > PAGE_SIZE) | |
647 | return -1; | |
648 | memcpy(p, o->data, o->len); | |
753ed90d | 649 | memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); |
1da177e4 LT |
650 | return 0; |
651 | } | |
652 | ||
21fcd02b BF |
653 | /* |
654 | * Verify the checksum on the header and return SVC_OK on success. | |
1da177e4 LT |
655 | * Otherwise, return SVC_DROP (in the case of a bad sequence number) |
656 | * or return SVC_DENIED and indicate error in authp. | |
657 | */ | |
658 | static int | |
659 | gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, | |
d8ed029d | 660 | __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) |
1da177e4 LT |
661 | { |
662 | struct gss_ctx *ctx_id = rsci->mechctx; | |
663 | struct xdr_buf rpchdr; | |
664 | struct xdr_netobj checksum; | |
665 | u32 flavor = 0; | |
666 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
667 | struct kvec iov; | |
668 | ||
669 | /* data to compute the checksum over: */ | |
670 | iov.iov_base = rpcstart; | |
671 | iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; | |
672 | xdr_buf_from_iov(&iov, &rpchdr); | |
673 | ||
674 | *authp = rpc_autherr_badverf; | |
675 | if (argv->iov_len < 4) | |
676 | return SVC_DENIED; | |
76994313 | 677 | flavor = svc_getnl(argv); |
1da177e4 LT |
678 | if (flavor != RPC_AUTH_GSS) |
679 | return SVC_DENIED; | |
680 | if (svc_safe_getnetobj(argv, &checksum)) | |
681 | return SVC_DENIED; | |
682 | ||
683 | if (rqstp->rq_deferred) /* skip verification of revisited request */ | |
684 | return SVC_OK; | |
00fd6e14 | 685 | if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { |
1da177e4 LT |
686 | *authp = rpcsec_gsserr_credproblem; |
687 | return SVC_DENIED; | |
688 | } | |
689 | ||
690 | if (gc->gc_seq > MAXSEQ) { | |
8885cb36 CL |
691 | dprintk("RPC: svcauth_gss: discarding request with " |
692 | "large sequence number %d\n", gc->gc_seq); | |
1da177e4 LT |
693 | *authp = rpcsec_gsserr_ctxproblem; |
694 | return SVC_DENIED; | |
695 | } | |
696 | if (!gss_check_seq_num(rsci, gc->gc_seq)) { | |
8885cb36 CL |
697 | dprintk("RPC: svcauth_gss: discarding request with " |
698 | "old sequence number %d\n", gc->gc_seq); | |
1da177e4 LT |
699 | return SVC_DROP; |
700 | } | |
701 | return SVC_OK; | |
702 | } | |
703 | ||
822f1005 AA |
704 | static int |
705 | gss_write_null_verf(struct svc_rqst *rqstp) | |
706 | { | |
d8ed029d | 707 | __be32 *p; |
822f1005 | 708 | |
76994313 | 709 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); |
822f1005 AA |
710 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; |
711 | /* don't really need to check if head->iov_len > PAGE_SIZE ... */ | |
712 | *p++ = 0; | |
713 | if (!xdr_ressize_check(rqstp, p)) | |
714 | return -1; | |
715 | return 0; | |
716 | } | |
717 | ||
1da177e4 LT |
718 | static int |
719 | gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) | |
720 | { | |
d8ed029d | 721 | __be32 xdr_seq; |
1da177e4 LT |
722 | u32 maj_stat; |
723 | struct xdr_buf verf_data; | |
724 | struct xdr_netobj mic; | |
d8ed029d | 725 | __be32 *p; |
1da177e4 LT |
726 | struct kvec iov; |
727 | ||
76994313 | 728 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); |
1da177e4 LT |
729 | xdr_seq = htonl(seq); |
730 | ||
731 | iov.iov_base = &xdr_seq; | |
732 | iov.iov_len = sizeof(xdr_seq); | |
733 | xdr_buf_from_iov(&iov, &verf_data); | |
734 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; | |
735 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 736 | maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); |
1da177e4 LT |
737 | if (maj_stat != GSS_S_COMPLETE) |
738 | return -1; | |
739 | *p++ = htonl(mic.len); | |
740 | memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); | |
741 | p += XDR_QUADLEN(mic.len); | |
742 | if (!xdr_ressize_check(rqstp, p)) | |
743 | return -1; | |
744 | return 0; | |
745 | } | |
746 | ||
747 | struct gss_domain { | |
748 | struct auth_domain h; | |
749 | u32 pseudoflavor; | |
750 | }; | |
751 | ||
752 | static struct auth_domain * | |
753 | find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) | |
754 | { | |
755 | char *name; | |
756 | ||
757 | name = gss_service_to_auth_domain_name(ctx->mech_type, svc); | |
758 | if (!name) | |
759 | return NULL; | |
760 | return auth_domain_find(name); | |
761 | } | |
762 | ||
efc36aa5 N |
763 | static struct auth_ops svcauthops_gss; |
764 | ||
4796f457 BF |
765 | u32 svcauth_gss_flavor(struct auth_domain *dom) |
766 | { | |
767 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); | |
768 | ||
769 | return gd->pseudoflavor; | |
770 | } | |
771 | ||
7bd88269 | 772 | EXPORT_SYMBOL_GPL(svcauth_gss_flavor); |
4796f457 | 773 | |
1da177e4 LT |
774 | int |
775 | svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) | |
776 | { | |
777 | struct gss_domain *new; | |
778 | struct auth_domain *test; | |
779 | int stat = -ENOMEM; | |
780 | ||
781 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
782 | if (!new) | |
783 | goto out; | |
efc36aa5 | 784 | kref_init(&new->h.ref); |
e69062b4 | 785 | new->h.name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
786 | if (!new->h.name) |
787 | goto out_free_dom; | |
efc36aa5 | 788 | new->h.flavour = &svcauthops_gss; |
1da177e4 | 789 | new->pseudoflavor = pseudoflavor; |
1da177e4 | 790 | |
cb276805 | 791 | stat = 0; |
efc36aa5 | 792 | test = auth_domain_lookup(name, &new->h); |
cb276805 BF |
793 | if (test != &new->h) { /* Duplicate registration */ |
794 | auth_domain_put(test); | |
795 | kfree(new->h.name); | |
796 | goto out_free_dom; | |
1da177e4 LT |
797 | } |
798 | return 0; | |
799 | ||
800 | out_free_dom: | |
801 | kfree(new); | |
802 | out: | |
803 | return stat; | |
804 | } | |
805 | ||
7bd88269 | 806 | EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); |
1da177e4 LT |
807 | |
808 | static inline int | |
809 | read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) | |
810 | { | |
d8ed029d | 811 | __be32 raw; |
1da177e4 LT |
812 | int status; |
813 | ||
814 | status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); | |
815 | if (status) | |
816 | return status; | |
817 | *obj = ntohl(raw); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | /* It would be nice if this bit of code could be shared with the client. | |
822 | * Obstacles: | |
823 | * The client shouldn't malloc(), would have to pass in own memory. | |
824 | * The server uses base of head iovec as read pointer, while the | |
825 | * client uses separate pointer. */ | |
826 | static int | |
4c190e2f | 827 | unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) |
1da177e4 LT |
828 | { |
829 | int stat = -EINVAL; | |
830 | u32 integ_len, maj_stat; | |
831 | struct xdr_netobj mic; | |
832 | struct xdr_buf integ_buf; | |
833 | ||
4c190e2f JL |
834 | /* Did we already verify the signature on the original pass through? */ |
835 | if (rqstp->rq_deferred) | |
836 | return 0; | |
837 | ||
76994313 | 838 | integ_len = svc_getnl(&buf->head[0]); |
1da177e4 | 839 | if (integ_len & 3) |
b797b5be | 840 | return stat; |
1da177e4 | 841 | if (integ_len > buf->len) |
b797b5be | 842 | return stat; |
1da177e4 LT |
843 | if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) |
844 | BUG(); | |
845 | /* copy out mic... */ | |
846 | if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) | |
847 | BUG(); | |
848 | if (mic.len > RPC_MAX_AUTH_SIZE) | |
b797b5be | 849 | return stat; |
1da177e4 LT |
850 | mic.data = kmalloc(mic.len, GFP_KERNEL); |
851 | if (!mic.data) | |
b797b5be | 852 | return stat; |
1da177e4 LT |
853 | if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) |
854 | goto out; | |
00fd6e14 | 855 | maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); |
1da177e4 LT |
856 | if (maj_stat != GSS_S_COMPLETE) |
857 | goto out; | |
76994313 | 858 | if (svc_getnl(&buf->head[0]) != seq) |
1da177e4 | 859 | goto out; |
4c190e2f JL |
860 | /* trim off the mic at the end before returning */ |
861 | xdr_buf_trim(buf, mic.len + 4); | |
1da177e4 LT |
862 | stat = 0; |
863 | out: | |
b797b5be | 864 | kfree(mic.data); |
1da177e4 LT |
865 | return stat; |
866 | } | |
867 | ||
7c9fdcfb BF |
868 | static inline int |
869 | total_buf_len(struct xdr_buf *buf) | |
870 | { | |
871 | return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; | |
872 | } | |
873 | ||
874 | static void | |
875 | fix_priv_head(struct xdr_buf *buf, int pad) | |
876 | { | |
877 | if (buf->page_len == 0) { | |
878 | /* We need to adjust head and buf->len in tandem in this | |
879 | * case to make svc_defer() work--it finds the original | |
880 | * buffer start using buf->len - buf->head[0].iov_len. */ | |
881 | buf->head[0].iov_len -= pad; | |
882 | } | |
883 | } | |
884 | ||
885 | static int | |
886 | unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) | |
887 | { | |
888 | u32 priv_len, maj_stat; | |
889 | int pad, saved_len, remaining_len, offset; | |
890 | ||
cf8208d0 | 891 | rqstp->rq_splice_ok = 0; |
7c9fdcfb | 892 | |
76994313 | 893 | priv_len = svc_getnl(&buf->head[0]); |
7c9fdcfb BF |
894 | if (rqstp->rq_deferred) { |
895 | /* Already decrypted last time through! The sequence number | |
896 | * check at out_seq is unnecessary but harmless: */ | |
897 | goto out_seq; | |
898 | } | |
899 | /* buf->len is the number of bytes from the original start of the | |
900 | * request to the end, where head[0].iov_len is just the bytes | |
901 | * not yet read from the head, so these two values are different: */ | |
902 | remaining_len = total_buf_len(buf); | |
903 | if (priv_len > remaining_len) | |
904 | return -EINVAL; | |
905 | pad = remaining_len - priv_len; | |
906 | buf->len -= pad; | |
907 | fix_priv_head(buf, pad); | |
908 | ||
909 | /* Maybe it would be better to give gss_unwrap a length parameter: */ | |
910 | saved_len = buf->len; | |
911 | buf->len = priv_len; | |
912 | maj_stat = gss_unwrap(ctx, 0, buf); | |
913 | pad = priv_len - buf->len; | |
914 | buf->len = saved_len; | |
915 | buf->len -= pad; | |
916 | /* The upper layers assume the buffer is aligned on 4-byte boundaries. | |
917 | * In the krb5p case, at least, the data ends up offset, so we need to | |
918 | * move it around. */ | |
919 | /* XXX: This is very inefficient. It would be better to either do | |
920 | * this while we encrypt, or maybe in the receive code, if we can peak | |
921 | * ahead and work out the service and mechanism there. */ | |
922 | offset = buf->head[0].iov_len % 4; | |
923 | if (offset) { | |
924 | buf->buflen = RPCSVC_MAXPAYLOAD; | |
925 | xdr_shift_buf(buf, offset); | |
926 | fix_priv_head(buf, pad); | |
927 | } | |
928 | if (maj_stat != GSS_S_COMPLETE) | |
929 | return -EINVAL; | |
930 | out_seq: | |
76994313 | 931 | if (svc_getnl(&buf->head[0]) != seq) |
7c9fdcfb BF |
932 | return -EINVAL; |
933 | return 0; | |
934 | } | |
935 | ||
1da177e4 LT |
936 | struct gss_svc_data { |
937 | /* decoded gss client cred: */ | |
938 | struct rpc_gss_wire_cred clcred; | |
5b304bc5 BF |
939 | /* save a pointer to the beginning of the encoded verifier, |
940 | * for use in encryption/checksumming in svcauth_gss_release: */ | |
941 | __be32 *verf_start; | |
1da177e4 LT |
942 | struct rsc *rsci; |
943 | }; | |
944 | ||
945 | static int | |
946 | svcauth_gss_set_client(struct svc_rqst *rqstp) | |
947 | { | |
948 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; | |
949 | struct rsc *rsci = svcdata->rsci; | |
950 | struct rpc_gss_wire_cred *gc = &svcdata->clcred; | |
3ab4d8b1 | 951 | int stat; |
1da177e4 | 952 | |
3ab4d8b1 BF |
953 | /* |
954 | * A gss export can be specified either by: | |
955 | * export *(sec=krb5,rw) | |
956 | * or by | |
957 | * export gss/krb5(rw) | |
958 | * The latter is deprecated; but for backwards compatibility reasons | |
959 | * the nfsd code will still fall back on trying it if the former | |
960 | * doesn't work; so we try to make both available to nfsd, below. | |
961 | */ | |
962 | rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); | |
963 | if (rqstp->rq_gssclient == NULL) | |
1da177e4 | 964 | return SVC_DENIED; |
3ab4d8b1 | 965 | stat = svcauth_unix_set_client(rqstp); |
1ebede86 | 966 | if (stat == SVC_DROP || stat == SVC_CLOSE) |
3ab4d8b1 | 967 | return stat; |
1da177e4 LT |
968 | return SVC_OK; |
969 | } | |
970 | ||
91a4762e | 971 | static inline int |
fc2952a2 SS |
972 | gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, |
973 | struct xdr_netobj *out_handle, int *major_status) | |
91a4762e KC |
974 | { |
975 | struct rsc *rsci; | |
54f9247b | 976 | int rc; |
91a4762e | 977 | |
fc2952a2 | 978 | if (*major_status != GSS_S_COMPLETE) |
91a4762e | 979 | return gss_write_null_verf(rqstp); |
fc2952a2 | 980 | rsci = gss_svc_searchbyctx(cd, out_handle); |
91a4762e | 981 | if (rsci == NULL) { |
fc2952a2 | 982 | *major_status = GSS_S_NO_CONTEXT; |
91a4762e KC |
983 | return gss_write_null_verf(rqstp); |
984 | } | |
54f9247b | 985 | rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); |
a1db410d | 986 | cache_put(&rsci->h, cd); |
54f9247b | 987 | return rc; |
91a4762e KC |
988 | } |
989 | ||
fc2952a2 | 990 | static inline int |
030d794b SS |
991 | gss_read_common_verf(struct rpc_gss_wire_cred *gc, |
992 | struct kvec *argv, __be32 *authp, | |
993 | struct xdr_netobj *in_handle) | |
21fcd02b | 994 | { |
21fcd02b BF |
995 | /* Read the verifier; should be NULL: */ |
996 | *authp = rpc_autherr_badverf; | |
997 | if (argv->iov_len < 2 * 4) | |
998 | return SVC_DENIED; | |
999 | if (svc_getnl(argv) != RPC_AUTH_NULL) | |
1000 | return SVC_DENIED; | |
1001 | if (svc_getnl(argv) != 0) | |
1002 | return SVC_DENIED; | |
21fcd02b BF |
1003 | /* Martial context handle and token for upcall: */ |
1004 | *authp = rpc_autherr_badcred; | |
1005 | if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) | |
1006 | return SVC_DENIED; | |
fc2952a2 | 1007 | if (dup_netobj(in_handle, &gc->gc_ctx)) |
1ebede86 | 1008 | return SVC_CLOSE; |
21fcd02b | 1009 | *authp = rpc_autherr_badverf; |
030d794b SS |
1010 | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | static inline int | |
1015 | gss_read_verf(struct rpc_gss_wire_cred *gc, | |
1016 | struct kvec *argv, __be32 *authp, | |
1017 | struct xdr_netobj *in_handle, | |
1018 | struct xdr_netobj *in_token) | |
1019 | { | |
1020 | struct xdr_netobj tmpobj; | |
1021 | int res; | |
1022 | ||
1023 | res = gss_read_common_verf(gc, argv, authp, in_handle); | |
1024 | if (res) | |
1025 | return res; | |
1026 | ||
21fcd02b | 1027 | if (svc_safe_getnetobj(argv, &tmpobj)) { |
fc2952a2 | 1028 | kfree(in_handle->data); |
21fcd02b BF |
1029 | return SVC_DENIED; |
1030 | } | |
fc2952a2 SS |
1031 | if (dup_netobj(in_token, &tmpobj)) { |
1032 | kfree(in_handle->data); | |
1ebede86 | 1033 | return SVC_CLOSE; |
21fcd02b BF |
1034 | } |
1035 | ||
fc2952a2 SS |
1036 | return 0; |
1037 | } | |
1038 | ||
030d794b SS |
1039 | /* Ok this is really heavily depending on a set of semantics in |
1040 | * how rqstp is set up by svc_recv and pages laid down by the | |
1041 | * server when reading a request. We are basically guaranteed that | |
1042 | * the token lays all down linearly across a set of pages, starting | |
1043 | * at iov_base in rq_arg.head[0] which happens to be the first of a | |
1044 | * set of pages stored in rq_pages[]. | |
1045 | * rq_arg.head[0].iov_base will provide us the page_base to pass | |
1046 | * to the upcall. | |
1047 | */ | |
1048 | static inline int | |
1049 | gss_read_proxy_verf(struct svc_rqst *rqstp, | |
1050 | struct rpc_gss_wire_cred *gc, __be32 *authp, | |
1051 | struct xdr_netobj *in_handle, | |
1052 | struct gssp_in_token *in_token) | |
1053 | { | |
1054 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1055 | u32 inlen; | |
1056 | int res; | |
1057 | ||
1058 | res = gss_read_common_verf(gc, argv, authp, in_handle); | |
1059 | if (res) | |
1060 | return res; | |
1061 | ||
1062 | inlen = svc_getnl(argv); | |
1063 | if (inlen > (argv->iov_len + rqstp->rq_arg.page_len)) | |
1064 | return SVC_DENIED; | |
1065 | ||
1066 | in_token->pages = rqstp->rq_pages; | |
1067 | in_token->page_base = (ulong)argv->iov_base & ~PAGE_MASK; | |
1068 | in_token->page_len = inlen; | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
fc2952a2 SS |
1073 | static inline int |
1074 | gss_write_resv(struct kvec *resv, size_t size_limit, | |
1075 | struct xdr_netobj *out_handle, struct xdr_netobj *out_token, | |
1076 | int major_status, int minor_status) | |
1077 | { | |
1078 | if (resv->iov_len + 4 > size_limit) | |
1079 | return -1; | |
1080 | svc_putnl(resv, RPC_SUCCESS); | |
1081 | if (svc_safe_putnetobj(resv, out_handle)) | |
1082 | return -1; | |
1083 | if (resv->iov_len + 3 * 4 > size_limit) | |
1084 | return -1; | |
1085 | svc_putnl(resv, major_status); | |
1086 | svc_putnl(resv, minor_status); | |
1087 | svc_putnl(resv, GSS_SEQ_WIN); | |
1088 | if (svc_safe_putnetobj(resv, out_token)) | |
1089 | return -1; | |
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Having read the cred already and found we're in the context | |
1095 | * initiation case, read the verifier and initiate (or check the results | |
1096 | * of) upcalls to userspace for help with context initiation. If | |
1097 | * the upcall results are available, write the verifier and result. | |
1098 | * Otherwise, drop the request pending an answer to the upcall. | |
1099 | */ | |
030d794b | 1100 | static int svcauth_gss_legacy_init(struct svc_rqst *rqstp, |
fc2952a2 SS |
1101 | struct rpc_gss_wire_cred *gc, __be32 *authp) |
1102 | { | |
1103 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1104 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1105 | struct rsi *rsip, rsikey; | |
1106 | int ret; | |
1107 | struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); | |
1108 | ||
1109 | memset(&rsikey, 0, sizeof(rsikey)); | |
1110 | ret = gss_read_verf(gc, argv, authp, | |
1111 | &rsikey.in_handle, &rsikey.in_token); | |
1112 | if (ret) | |
1113 | return ret; | |
1114 | ||
21fcd02b | 1115 | /* Perform upcall, or find upcall result: */ |
a1db410d | 1116 | rsip = rsi_lookup(sn->rsi_cache, &rsikey); |
21fcd02b BF |
1117 | rsi_free(&rsikey); |
1118 | if (!rsip) | |
1ebede86 | 1119 | return SVC_CLOSE; |
a1db410d | 1120 | if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) |
21fcd02b | 1121 | /* No upcall result: */ |
1ebede86 | 1122 | return SVC_CLOSE; |
2ed5282c N |
1123 | |
1124 | ret = SVC_CLOSE; | |
1125 | /* Got an answer to the upcall; use it: */ | |
fc2952a2 SS |
1126 | if (gss_write_init_verf(sn->rsc_cache, rqstp, |
1127 | &rsip->out_handle, &rsip->major_status)) | |
2ed5282c | 1128 | goto out; |
fc2952a2 SS |
1129 | if (gss_write_resv(resv, PAGE_SIZE, |
1130 | &rsip->out_handle, &rsip->out_token, | |
1131 | rsip->major_status, rsip->minor_status)) | |
2ed5282c N |
1132 | goto out; |
1133 | ||
980e5a40 BF |
1134 | ret = SVC_COMPLETE; |
1135 | out: | |
a1db410d | 1136 | cache_put(&rsip->h, sn->rsi_cache); |
980e5a40 | 1137 | return ret; |
21fcd02b BF |
1138 | } |
1139 | ||
030d794b SS |
1140 | static int gss_proxy_save_rsc(struct cache_detail *cd, |
1141 | struct gssp_upcall_data *ud, | |
1142 | uint64_t *handle) | |
1143 | { | |
1144 | struct rsc rsci, *rscp = NULL; | |
1145 | static atomic64_t ctxhctr; | |
1146 | long long ctxh; | |
1147 | struct gss_api_mech *gm = NULL; | |
1148 | time_t expiry; | |
1149 | int status = -EINVAL; | |
1150 | ||
1151 | memset(&rsci, 0, sizeof(rsci)); | |
1152 | /* context handle */ | |
1153 | status = -ENOMEM; | |
1154 | /* the handle needs to be just a unique id, | |
1155 | * use a static counter */ | |
1156 | ctxh = atomic64_inc_return(&ctxhctr); | |
1157 | ||
1158 | /* make a copy for the caller */ | |
1159 | *handle = ctxh; | |
1160 | ||
1161 | /* make a copy for the rsc cache */ | |
1162 | if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t))) | |
1163 | goto out; | |
1164 | rscp = rsc_lookup(cd, &rsci); | |
1165 | if (!rscp) | |
1166 | goto out; | |
1167 | ||
1168 | /* creds */ | |
1169 | if (!ud->found_creds) { | |
1170 | /* userspace seem buggy, we should always get at least a | |
1171 | * mapping to nobody */ | |
1172 | dprintk("RPC: No creds found, marking Negative!\n"); | |
1173 | set_bit(CACHE_NEGATIVE, &rsci.h.flags); | |
1174 | } else { | |
1175 | ||
1176 | /* steal creds */ | |
1177 | rsci.cred = ud->creds; | |
1178 | memset(&ud->creds, 0, sizeof(struct svc_cred)); | |
1179 | ||
1180 | status = -EOPNOTSUPP; | |
1181 | /* get mech handle from OID */ | |
1182 | gm = gss_mech_get_by_OID(&ud->mech_oid); | |
1183 | if (!gm) | |
1184 | goto out; | |
1185 | ||
1186 | status = -EINVAL; | |
1187 | /* mech-specific data: */ | |
1188 | status = gss_import_sec_context(ud->out_handle.data, | |
1189 | ud->out_handle.len, | |
1190 | gm, &rsci.mechctx, | |
1191 | &expiry, GFP_KERNEL); | |
1192 | if (status) | |
1193 | goto out; | |
1194 | } | |
1195 | ||
1196 | rsci.h.expiry_time = expiry; | |
1197 | rscp = rsc_update(cd, &rsci, rscp); | |
1198 | status = 0; | |
1199 | out: | |
1200 | gss_mech_put(gm); | |
1201 | rsc_free(&rsci); | |
1202 | if (rscp) | |
1203 | cache_put(&rscp->h, cd); | |
1204 | else | |
1205 | status = -ENOMEM; | |
1206 | return status; | |
1207 | } | |
1208 | ||
1209 | static int svcauth_gss_proxy_init(struct svc_rqst *rqstp, | |
1210 | struct rpc_gss_wire_cred *gc, __be32 *authp) | |
1211 | { | |
1212 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1213 | struct xdr_netobj cli_handle; | |
1214 | struct gssp_upcall_data ud; | |
1215 | uint64_t handle; | |
1216 | int status; | |
1217 | int ret; | |
1218 | struct net *net = rqstp->rq_xprt->xpt_net; | |
1219 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1220 | ||
1221 | memset(&ud, 0, sizeof(ud)); | |
1222 | ret = gss_read_proxy_verf(rqstp, gc, authp, | |
1223 | &ud.in_handle, &ud.in_token); | |
1224 | if (ret) | |
1225 | return ret; | |
1226 | ||
1227 | ret = SVC_CLOSE; | |
1228 | ||
1229 | /* Perform synchronous upcall to gss-proxy */ | |
1230 | status = gssp_accept_sec_context_upcall(net, &ud); | |
1231 | if (status) | |
1232 | goto out; | |
1233 | ||
1234 | dprintk("RPC: svcauth_gss: gss major status = %d\n", | |
1235 | ud.major_status); | |
1236 | ||
1237 | switch (ud.major_status) { | |
1238 | case GSS_S_CONTINUE_NEEDED: | |
1239 | cli_handle = ud.out_handle; | |
1240 | break; | |
1241 | case GSS_S_COMPLETE: | |
1242 | status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle); | |
1243 | if (status) | |
1244 | goto out; | |
1245 | cli_handle.data = (u8 *)&handle; | |
1246 | cli_handle.len = sizeof(handle); | |
1247 | break; | |
1248 | default: | |
1249 | ret = SVC_CLOSE; | |
1250 | goto out; | |
1251 | } | |
1252 | ||
1253 | /* Got an answer to the upcall; use it: */ | |
1254 | if (gss_write_init_verf(sn->rsc_cache, rqstp, | |
1255 | &cli_handle, &ud.major_status)) | |
1256 | goto out; | |
1257 | if (gss_write_resv(resv, PAGE_SIZE, | |
1258 | &cli_handle, &ud.out_token, | |
1259 | ud.major_status, ud.minor_status)) | |
1260 | goto out; | |
1261 | ||
1262 | ret = SVC_COMPLETE; | |
1263 | out: | |
1264 | gssp_free_upcall_data(&ud); | |
1265 | return ret; | |
1266 | } | |
1267 | ||
1268 | DEFINE_SPINLOCK(use_gssp_lock); | |
1269 | ||
1270 | static bool use_gss_proxy(struct net *net) | |
1271 | { | |
1272 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1273 | ||
1274 | if (sn->use_gss_proxy != -1) | |
1275 | return sn->use_gss_proxy; | |
1276 | spin_lock(&use_gssp_lock); | |
1277 | /* | |
1278 | * If you wanted gss-proxy, you should have said so before | |
1279 | * starting to accept requests: | |
1280 | */ | |
1281 | sn->use_gss_proxy = 0; | |
1282 | spin_unlock(&use_gssp_lock); | |
1283 | return 0; | |
1284 | } | |
1285 | ||
0ff3bab5 BF |
1286 | #ifdef CONFIG_PROC_FS |
1287 | ||
030d794b SS |
1288 | static bool set_gss_proxy(struct net *net, int type) |
1289 | { | |
1290 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1291 | int ret = 0; | |
1292 | ||
1293 | WARN_ON_ONCE(type != 0 && type != 1); | |
1294 | spin_lock(&use_gssp_lock); | |
1295 | if (sn->use_gss_proxy == -1 || sn->use_gss_proxy == type) | |
1296 | sn->use_gss_proxy = type; | |
1297 | else | |
1298 | ret = -EBUSY; | |
1299 | spin_unlock(&use_gssp_lock); | |
1300 | wake_up(&sn->gssp_wq); | |
1301 | return ret; | |
1302 | } | |
1303 | ||
1304 | static inline bool gssp_ready(struct sunrpc_net *sn) | |
1305 | { | |
1306 | switch (sn->use_gss_proxy) { | |
1307 | case -1: | |
1308 | return false; | |
1309 | case 0: | |
1310 | return true; | |
1311 | case 1: | |
1312 | return sn->gssp_clnt; | |
1313 | } | |
1314 | WARN_ON_ONCE(1); | |
1315 | return false; | |
1316 | } | |
1317 | ||
1318 | static int wait_for_gss_proxy(struct net *net) | |
1319 | { | |
1320 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1321 | ||
1322 | return wait_event_interruptible(sn->gssp_wq, gssp_ready(sn)); | |
1323 | } | |
1324 | ||
030d794b SS |
1325 | |
1326 | static ssize_t write_gssp(struct file *file, const char __user *buf, | |
1327 | size_t count, loff_t *ppos) | |
1328 | { | |
1329 | struct net *net = PDE(file->f_path.dentry->d_inode)->data; | |
1330 | char tbuf[20]; | |
1331 | unsigned long i; | |
1332 | int res; | |
1333 | ||
1334 | if (*ppos || count > sizeof(tbuf)-1) | |
1335 | return -EINVAL; | |
1336 | if (copy_from_user(tbuf, buf, count)) | |
1337 | return -EFAULT; | |
1338 | ||
1339 | tbuf[count] = 0; | |
1340 | res = kstrtoul(tbuf, 0, &i); | |
1341 | if (res) | |
1342 | return res; | |
1343 | if (i != 1) | |
1344 | return -EINVAL; | |
1345 | res = set_gss_proxy(net, 1); | |
1346 | if (res) | |
1347 | return res; | |
1348 | res = set_gssp_clnt(net); | |
1349 | if (res) | |
1350 | return res; | |
1351 | return count; | |
1352 | } | |
1353 | ||
1354 | static ssize_t read_gssp(struct file *file, char __user *buf, | |
1355 | size_t count, loff_t *ppos) | |
1356 | { | |
1357 | struct net *net = PDE(file->f_path.dentry->d_inode)->data; | |
1358 | unsigned long p = *ppos; | |
1359 | char tbuf[10]; | |
1360 | size_t len; | |
1361 | int ret; | |
1362 | ||
1363 | ret = wait_for_gss_proxy(net); | |
1364 | if (ret) | |
1365 | return ret; | |
1366 | ||
1367 | snprintf(tbuf, sizeof(tbuf), "%d\n", use_gss_proxy(net)); | |
1368 | len = strlen(tbuf); | |
1369 | if (p >= len) | |
1370 | return 0; | |
1371 | len -= p; | |
1372 | if (len > count) | |
1373 | len = count; | |
1374 | if (copy_to_user(buf, (void *)(tbuf+p), len)) | |
1375 | return -EFAULT; | |
1376 | *ppos += len; | |
1377 | return len; | |
1378 | } | |
1379 | ||
1380 | static const struct file_operations use_gss_proxy_ops = { | |
1381 | .open = nonseekable_open, | |
1382 | .write = write_gssp, | |
1383 | .read = read_gssp, | |
1384 | }; | |
1385 | ||
1386 | static int create_use_gss_proxy_proc_entry(struct net *net) | |
1387 | { | |
1388 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1389 | struct proc_dir_entry **p = &sn->use_gssp_proc; | |
1390 | ||
1391 | sn->use_gss_proxy = -1; | |
1392 | *p = proc_create_data("use-gss-proxy", S_IFREG|S_IRUSR|S_IWUSR, | |
1393 | sn->proc_net_rpc, | |
1394 | &use_gss_proxy_ops, net); | |
1395 | if (!*p) | |
1396 | return -ENOMEM; | |
1397 | init_gssp_clnt(sn); | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | static void destroy_use_gss_proxy_proc_entry(struct net *net) | |
1402 | { | |
1403 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1404 | ||
1405 | if (sn->use_gssp_proc) { | |
1406 | remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); | |
1407 | clear_gssp_clnt(sn); | |
1408 | } | |
1409 | } | |
0ff3bab5 BF |
1410 | #else /* CONFIG_PROC_FS */ |
1411 | ||
1412 | static int create_use_gss_proxy_proc_entry(struct net *net) | |
1413 | { | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | static void destroy_use_gss_proxy_proc_entry(struct net *net) {} | |
030d794b SS |
1418 | |
1419 | #endif /* CONFIG_PROC_FS */ | |
1420 | ||
1da177e4 LT |
1421 | /* |
1422 | * Accept an rpcsec packet. | |
1423 | * If context establishment, punt to user space | |
1424 | * If data exchange, verify/decrypt | |
1425 | * If context destruction, handle here | |
1426 | * In the context establishment and destruction case we encode | |
1427 | * response here and return SVC_COMPLETE. | |
1428 | */ | |
1429 | static int | |
d8ed029d | 1430 | svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) |
1da177e4 LT |
1431 | { |
1432 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1433 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1434 | u32 crlen; | |
1da177e4 LT |
1435 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; |
1436 | struct rpc_gss_wire_cred *gc; | |
1437 | struct rsc *rsci = NULL; | |
d8ed029d AD |
1438 | __be32 *rpcstart; |
1439 | __be32 *reject_stat = resv->iov_base + resv->iov_len; | |
1da177e4 | 1440 | int ret; |
a1db410d | 1441 | struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); |
1da177e4 | 1442 | |
8885cb36 CL |
1443 | dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", |
1444 | argv->iov_len); | |
1da177e4 LT |
1445 | |
1446 | *authp = rpc_autherr_badcred; | |
1447 | if (!svcdata) | |
1448 | svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); | |
1449 | if (!svcdata) | |
1450 | goto auth_err; | |
1451 | rqstp->rq_auth_data = svcdata; | |
5b304bc5 | 1452 | svcdata->verf_start = NULL; |
1da177e4 LT |
1453 | svcdata->rsci = NULL; |
1454 | gc = &svcdata->clcred; | |
1455 | ||
1456 | /* start of rpc packet is 7 u32's back from here: | |
1457 | * xid direction rpcversion prog vers proc flavour | |
1458 | */ | |
1459 | rpcstart = argv->iov_base; | |
1460 | rpcstart -= 7; | |
1461 | ||
1462 | /* credential is: | |
1463 | * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle | |
25985edc | 1464 | * at least 5 u32s, and is preceded by length, so that makes 6. |
1da177e4 LT |
1465 | */ |
1466 | ||
1467 | if (argv->iov_len < 5 * 4) | |
1468 | goto auth_err; | |
76994313 AD |
1469 | crlen = svc_getnl(argv); |
1470 | if (svc_getnl(argv) != RPC_GSS_VERSION) | |
1da177e4 | 1471 | goto auth_err; |
76994313 AD |
1472 | gc->gc_proc = svc_getnl(argv); |
1473 | gc->gc_seq = svc_getnl(argv); | |
1474 | gc->gc_svc = svc_getnl(argv); | |
1da177e4 LT |
1475 | if (svc_safe_getnetobj(argv, &gc->gc_ctx)) |
1476 | goto auth_err; | |
1477 | if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) | |
1478 | goto auth_err; | |
1479 | ||
1480 | if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) | |
1481 | goto auth_err; | |
1482 | ||
1da177e4 LT |
1483 | *authp = rpc_autherr_badverf; |
1484 | switch (gc->gc_proc) { | |
1485 | case RPC_GSS_PROC_INIT: | |
1486 | case RPC_GSS_PROC_CONTINUE_INIT: | |
030d794b SS |
1487 | if (use_gss_proxy(SVC_NET(rqstp))) |
1488 | return svcauth_gss_proxy_init(rqstp, gc, authp); | |
1489 | else | |
1490 | return svcauth_gss_legacy_init(rqstp, gc, authp); | |
1da177e4 LT |
1491 | case RPC_GSS_PROC_DATA: |
1492 | case RPC_GSS_PROC_DESTROY: | |
21fcd02b | 1493 | /* Look up the context, and check the verifier: */ |
1da177e4 | 1494 | *authp = rpcsec_gsserr_credproblem; |
a1db410d | 1495 | rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); |
1da177e4 LT |
1496 | if (!rsci) |
1497 | goto auth_err; | |
1498 | switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { | |
1499 | case SVC_OK: | |
1500 | break; | |
1501 | case SVC_DENIED: | |
1502 | goto auth_err; | |
1503 | case SVC_DROP: | |
1504 | goto drop; | |
1505 | } | |
1506 | break; | |
1507 | default: | |
1508 | *authp = rpc_autherr_rejectedcred; | |
1509 | goto auth_err; | |
1510 | } | |
1511 | ||
1512 | /* now act upon the command: */ | |
1513 | switch (gc->gc_proc) { | |
1da177e4 | 1514 | case RPC_GSS_PROC_DESTROY: |
c5e434c9 WY |
1515 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
1516 | goto auth_err; | |
cb5c7d66 | 1517 | rsci->h.expiry_time = get_seconds(); |
1da177e4 LT |
1518 | set_bit(CACHE_NEGATIVE, &rsci->h.flags); |
1519 | if (resv->iov_len + 4 > PAGE_SIZE) | |
1520 | goto drop; | |
76994313 | 1521 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 LT |
1522 | goto complete; |
1523 | case RPC_GSS_PROC_DATA: | |
1524 | *authp = rpcsec_gsserr_ctxproblem; | |
5b304bc5 | 1525 | svcdata->verf_start = resv->iov_base + resv->iov_len; |
1da177e4 LT |
1526 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
1527 | goto auth_err; | |
1528 | rqstp->rq_cred = rsci->cred; | |
1529 | get_group_info(rsci->cred.cr_group_info); | |
1530 | *authp = rpc_autherr_badcred; | |
1531 | switch (gc->gc_svc) { | |
1532 | case RPC_GSS_SVC_NONE: | |
1533 | break; | |
1534 | case RPC_GSS_SVC_INTEGRITY: | |
b620754b BF |
1535 | /* placeholders for length and seq. number: */ |
1536 | svc_putnl(resv, 0); | |
1537 | svc_putnl(resv, 0); | |
4c190e2f | 1538 | if (unwrap_integ_data(rqstp, &rqstp->rq_arg, |
1da177e4 | 1539 | gc->gc_seq, rsci->mechctx)) |
dd35210e | 1540 | goto garbage_args; |
b620754b BF |
1541 | break; |
1542 | case RPC_GSS_SVC_PRIVACY: | |
1da177e4 | 1543 | /* placeholders for length and seq. number: */ |
76994313 AD |
1544 | svc_putnl(resv, 0); |
1545 | svc_putnl(resv, 0); | |
7c9fdcfb BF |
1546 | if (unwrap_priv_data(rqstp, &rqstp->rq_arg, |
1547 | gc->gc_seq, rsci->mechctx)) | |
dd35210e | 1548 | goto garbage_args; |
7c9fdcfb | 1549 | break; |
1da177e4 LT |
1550 | default: |
1551 | goto auth_err; | |
1552 | } | |
1553 | svcdata->rsci = rsci; | |
1554 | cache_get(&rsci->h); | |
d5497fc6 | 1555 | rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( |
83523d08 CL |
1556 | rsci->mechctx->mech_type, |
1557 | GSS_C_QOP_DEFAULT, | |
1558 | gc->gc_svc); | |
1da177e4 LT |
1559 | ret = SVC_OK; |
1560 | goto out; | |
1561 | } | |
dd35210e | 1562 | garbage_args: |
dd35210e HJ |
1563 | ret = SVC_GARBAGE; |
1564 | goto out; | |
1da177e4 | 1565 | auth_err: |
21fcd02b | 1566 | /* Restore write pointer to its original value: */ |
1da177e4 LT |
1567 | xdr_ressize_check(rqstp, reject_stat); |
1568 | ret = SVC_DENIED; | |
1569 | goto out; | |
1570 | complete: | |
1571 | ret = SVC_COMPLETE; | |
1572 | goto out; | |
1573 | drop: | |
1574 | ret = SVC_DROP; | |
1575 | out: | |
1576 | if (rsci) | |
a1db410d | 1577 | cache_put(&rsci->h, sn->rsc_cache); |
1da177e4 LT |
1578 | return ret; |
1579 | } | |
1580 | ||
cfbdbab0 | 1581 | static __be32 * |
3c15a486 BF |
1582 | svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) |
1583 | { | |
cfbdbab0 AV |
1584 | __be32 *p; |
1585 | u32 verf_len; | |
3c15a486 | 1586 | |
5b304bc5 BF |
1587 | p = gsd->verf_start; |
1588 | gsd->verf_start = NULL; | |
1589 | ||
1590 | /* If the reply stat is nonzero, don't wrap: */ | |
1591 | if (*(p-1) != rpc_success) | |
1592 | return NULL; | |
1593 | /* Skip the verifier: */ | |
1594 | p += 1; | |
1595 | verf_len = ntohl(*p++); | |
1596 | p += XDR_QUADLEN(verf_len); | |
3c15a486 BF |
1597 | /* move accept_stat to right place: */ |
1598 | memcpy(p, p + 2, 4); | |
5b304bc5 | 1599 | /* Also don't wrap if the accept stat is nonzero: */ |
3c15a486 BF |
1600 | if (*p != rpc_success) { |
1601 | resbuf->head[0].iov_len -= 2 * 4; | |
1602 | return NULL; | |
1603 | } | |
1604 | p++; | |
1605 | return p; | |
1606 | } | |
1607 | ||
e142ede8 BF |
1608 | static inline int |
1609 | svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) | |
1da177e4 LT |
1610 | { |
1611 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1612 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1613 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1614 | struct xdr_buf integ_buf; | |
1615 | struct xdr_netobj mic; | |
1616 | struct kvec *resv; | |
d8ed029d | 1617 | __be32 *p; |
1da177e4 LT |
1618 | int integ_offset, integ_len; |
1619 | int stat = -EINVAL; | |
1620 | ||
3c15a486 BF |
1621 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
1622 | if (p == NULL) | |
e142ede8 | 1623 | goto out; |
e142ede8 BF |
1624 | integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; |
1625 | integ_len = resbuf->len - integ_offset; | |
1626 | BUG_ON(integ_len % 4); | |
1627 | *p++ = htonl(integ_len); | |
1628 | *p++ = htonl(gc->gc_seq); | |
1629 | if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, | |
1630 | integ_len)) | |
1631 | BUG(); | |
153e44d2 | 1632 | if (resbuf->tail[0].iov_base == NULL) { |
e142ede8 BF |
1633 | if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) |
1634 | goto out_err; | |
1635 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base | |
1636 | + resbuf->head[0].iov_len; | |
1637 | resbuf->tail[0].iov_len = 0; | |
e142ede8 BF |
1638 | resv = &resbuf->tail[0]; |
1639 | } else { | |
1640 | resv = &resbuf->tail[0]; | |
1641 | } | |
1642 | mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; | |
1643 | if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) | |
1644 | goto out_err; | |
76994313 | 1645 | svc_putnl(resv, mic.len); |
e142ede8 BF |
1646 | memset(mic.data + mic.len, 0, |
1647 | round_up_to_quad(mic.len) - mic.len); | |
1648 | resv->iov_len += XDR_QUADLEN(mic.len) << 2; | |
1649 | /* not strictly required: */ | |
1650 | resbuf->len += XDR_QUADLEN(mic.len) << 2; | |
1651 | BUG_ON(resv->iov_len > PAGE_SIZE); | |
1652 | out: | |
1653 | stat = 0; | |
1654 | out_err: | |
1655 | return stat; | |
1656 | } | |
1657 | ||
7c9fdcfb BF |
1658 | static inline int |
1659 | svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) | |
1660 | { | |
1661 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1662 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1663 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1664 | struct page **inpages = NULL; | |
753ed90d AV |
1665 | __be32 *p, *len; |
1666 | int offset; | |
7c9fdcfb BF |
1667 | int pad; |
1668 | ||
3c15a486 BF |
1669 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
1670 | if (p == NULL) | |
7c9fdcfb | 1671 | return 0; |
7c9fdcfb BF |
1672 | len = p++; |
1673 | offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; | |
1674 | *p++ = htonl(gc->gc_seq); | |
1675 | inpages = resbuf->pages; | |
1676 | /* XXX: Would be better to write some xdr helper functions for | |
1677 | * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ | |
7561042f KC |
1678 | |
1679 | /* | |
1680 | * If there is currently tail data, make sure there is | |
1681 | * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in | |
1682 | * the page, and move the current tail data such that | |
1683 | * there is RPC_MAX_AUTH_SIZE slack space available in | |
1684 | * both the head and tail. | |
1685 | */ | |
44524359 | 1686 | if (resbuf->tail[0].iov_base) { |
7c9fdcfb BF |
1687 | BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base |
1688 | + PAGE_SIZE); | |
1689 | BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); | |
1690 | if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len | |
1691 | + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) | |
1692 | return -ENOMEM; | |
1693 | memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, | |
1694 | resbuf->tail[0].iov_base, | |
1695 | resbuf->tail[0].iov_len); | |
1696 | resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; | |
1697 | } | |
7561042f KC |
1698 | /* |
1699 | * If there is no current tail data, make sure there is | |
1700 | * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the | |
1701 | * allotted page, and set up tail information such that there | |
1702 | * is RPC_MAX_AUTH_SIZE slack space available in both the | |
1703 | * head and tail. | |
1704 | */ | |
7c9fdcfb BF |
1705 | if (resbuf->tail[0].iov_base == NULL) { |
1706 | if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) | |
1707 | return -ENOMEM; | |
1708 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base | |
1709 | + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; | |
1710 | resbuf->tail[0].iov_len = 0; | |
7c9fdcfb BF |
1711 | } |
1712 | if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) | |
1713 | return -ENOMEM; | |
1714 | *len = htonl(resbuf->len - offset); | |
1715 | pad = 3 - ((resbuf->len - offset - 1)&3); | |
d8ed029d | 1716 | p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); |
7c9fdcfb BF |
1717 | memset(p, 0, pad); |
1718 | resbuf->tail[0].iov_len += pad; | |
1719 | resbuf->len += pad; | |
1720 | return 0; | |
1721 | } | |
1722 | ||
e142ede8 BF |
1723 | static int |
1724 | svcauth_gss_release(struct svc_rqst *rqstp) | |
1725 | { | |
1726 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1727 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1728 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1729 | int stat = -EINVAL; | |
a1db410d | 1730 | struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); |
e142ede8 | 1731 | |
1da177e4 LT |
1732 | if (gc->gc_proc != RPC_GSS_PROC_DATA) |
1733 | goto out; | |
1734 | /* Release can be called twice, but we only wrap once. */ | |
5b304bc5 | 1735 | if (gsd->verf_start == NULL) |
1da177e4 LT |
1736 | goto out; |
1737 | /* normally not set till svc_send, but we need it here: */ | |
7c9fdcfb BF |
1738 | /* XXX: what for? Do we mess it up the moment we call svc_putu32 |
1739 | * or whatever? */ | |
1740 | resbuf->len = total_buf_len(resbuf); | |
1da177e4 LT |
1741 | switch (gc->gc_svc) { |
1742 | case RPC_GSS_SVC_NONE: | |
1743 | break; | |
1744 | case RPC_GSS_SVC_INTEGRITY: | |
7c9fdcfb BF |
1745 | stat = svcauth_gss_wrap_resp_integ(rqstp); |
1746 | if (stat) | |
1747 | goto out_err; | |
1da177e4 LT |
1748 | break; |
1749 | case RPC_GSS_SVC_PRIVACY: | |
7c9fdcfb BF |
1750 | stat = svcauth_gss_wrap_resp_priv(rqstp); |
1751 | if (stat) | |
1752 | goto out_err; | |
1753 | break; | |
eac81736 WY |
1754 | /* |
1755 | * For any other gc_svc value, svcauth_gss_accept() already set | |
1756 | * the auth_error appropriately; just fall through: | |
1757 | */ | |
1da177e4 LT |
1758 | } |
1759 | ||
1760 | out: | |
1761 | stat = 0; | |
1762 | out_err: | |
1763 | if (rqstp->rq_client) | |
1764 | auth_domain_put(rqstp->rq_client); | |
1765 | rqstp->rq_client = NULL; | |
3ab4d8b1 BF |
1766 | if (rqstp->rq_gssclient) |
1767 | auth_domain_put(rqstp->rq_gssclient); | |
1768 | rqstp->rq_gssclient = NULL; | |
1da177e4 LT |
1769 | if (rqstp->rq_cred.cr_group_info) |
1770 | put_group_info(rqstp->rq_cred.cr_group_info); | |
1771 | rqstp->rq_cred.cr_group_info = NULL; | |
1772 | if (gsd->rsci) | |
a1db410d | 1773 | cache_put(&gsd->rsci->h, sn->rsc_cache); |
1da177e4 LT |
1774 | gsd->rsci = NULL; |
1775 | ||
1776 | return stat; | |
1777 | } | |
1778 | ||
1779 | static void | |
1780 | svcauth_gss_domain_release(struct auth_domain *dom) | |
1781 | { | |
1782 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); | |
1783 | ||
1784 | kfree(dom->name); | |
1785 | kfree(gd); | |
1786 | } | |
1787 | ||
1788 | static struct auth_ops svcauthops_gss = { | |
1789 | .name = "rpcsec_gss", | |
1790 | .owner = THIS_MODULE, | |
1791 | .flavour = RPC_AUTH_GSS, | |
1792 | .accept = svcauth_gss_accept, | |
1793 | .release = svcauth_gss_release, | |
1794 | .domain_release = svcauth_gss_domain_release, | |
1795 | .set_client = svcauth_gss_set_client, | |
1796 | }; | |
1797 | ||
a1db410d SK |
1798 | static int rsi_cache_create_net(struct net *net) |
1799 | { | |
1800 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1801 | struct cache_detail *cd; | |
1802 | int err; | |
1803 | ||
1804 | cd = cache_create_net(&rsi_cache_template, net); | |
1805 | if (IS_ERR(cd)) | |
1806 | return PTR_ERR(cd); | |
1807 | err = cache_register_net(cd, net); | |
1808 | if (err) { | |
1809 | cache_destroy_net(cd, net); | |
1810 | return err; | |
1811 | } | |
1812 | sn->rsi_cache = cd; | |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | static void rsi_cache_destroy_net(struct net *net) | |
1817 | { | |
1818 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1819 | struct cache_detail *cd = sn->rsi_cache; | |
1820 | ||
1821 | sn->rsi_cache = NULL; | |
1822 | cache_purge(cd); | |
1823 | cache_unregister_net(cd, net); | |
1824 | cache_destroy_net(cd, net); | |
1825 | } | |
1826 | ||
1827 | static int rsc_cache_create_net(struct net *net) | |
1828 | { | |
1829 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1830 | struct cache_detail *cd; | |
1831 | int err; | |
1832 | ||
1833 | cd = cache_create_net(&rsc_cache_template, net); | |
1834 | if (IS_ERR(cd)) | |
1835 | return PTR_ERR(cd); | |
1836 | err = cache_register_net(cd, net); | |
1837 | if (err) { | |
1838 | cache_destroy_net(cd, net); | |
1839 | return err; | |
1840 | } | |
1841 | sn->rsc_cache = cd; | |
1842 | return 0; | |
1843 | } | |
1844 | ||
1845 | static void rsc_cache_destroy_net(struct net *net) | |
1846 | { | |
1847 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1848 | struct cache_detail *cd = sn->rsc_cache; | |
1849 | ||
1850 | sn->rsc_cache = NULL; | |
1851 | cache_purge(cd); | |
1852 | cache_unregister_net(cd, net); | |
1853 | cache_destroy_net(cd, net); | |
1854 | } | |
1855 | ||
1da177e4 | 1856 | int |
a1db410d | 1857 | gss_svc_init_net(struct net *net) |
1da177e4 | 1858 | { |
a1db410d SK |
1859 | int rv; |
1860 | ||
1861 | rv = rsc_cache_create_net(net); | |
dbf847ec BF |
1862 | if (rv) |
1863 | return rv; | |
a1db410d | 1864 | rv = rsi_cache_create_net(net); |
dbf847ec BF |
1865 | if (rv) |
1866 | goto out1; | |
030d794b SS |
1867 | rv = create_use_gss_proxy_proc_entry(net); |
1868 | if (rv) | |
1869 | goto out2; | |
dbf847ec | 1870 | return 0; |
030d794b SS |
1871 | out2: |
1872 | destroy_use_gss_proxy_proc_entry(net); | |
dbf847ec | 1873 | out1: |
a1db410d | 1874 | rsc_cache_destroy_net(net); |
1da177e4 LT |
1875 | return rv; |
1876 | } | |
1877 | ||
a1db410d SK |
1878 | void |
1879 | gss_svc_shutdown_net(struct net *net) | |
1880 | { | |
030d794b | 1881 | destroy_use_gss_proxy_proc_entry(net); |
a1db410d SK |
1882 | rsi_cache_destroy_net(net); |
1883 | rsc_cache_destroy_net(net); | |
1884 | } | |
1885 | ||
1886 | int | |
1887 | gss_svc_init(void) | |
1888 | { | |
1889 | return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); | |
1890 | } | |
1891 | ||
1da177e4 LT |
1892 | void |
1893 | gss_svc_shutdown(void) | |
1894 | { | |
1da177e4 LT |
1895 | svc_auth_unregister(RPC_AUTH_GSS); |
1896 | } |