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; | |
44234063 | 380 | init_svc_cred(&new->cred); |
1da177e4 LT |
381 | } |
382 | ||
17f834b6 N |
383 | static void |
384 | update_rsc(struct cache_head *cnew, struct cache_head *ctmp) | |
1da177e4 | 385 | { |
17f834b6 N |
386 | struct rsc *new = container_of(cnew, struct rsc, h); |
387 | struct rsc *tmp = container_of(ctmp, struct rsc, h); | |
388 | ||
1da177e4 LT |
389 | new->mechctx = tmp->mechctx; |
390 | tmp->mechctx = NULL; | |
391 | memset(&new->seqdata, 0, sizeof(new->seqdata)); | |
392 | spin_lock_init(&new->seqdata.sd_lock); | |
393 | new->cred = tmp->cred; | |
44234063 | 394 | init_svc_cred(&tmp->cred); |
1da177e4 LT |
395 | } |
396 | ||
17f834b6 N |
397 | static struct cache_head * |
398 | rsc_alloc(void) | |
399 | { | |
400 | struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); | |
401 | if (rsci) | |
402 | return &rsci->h; | |
403 | else | |
404 | return NULL; | |
405 | } | |
406 | ||
1da177e4 LT |
407 | static int rsc_parse(struct cache_detail *cd, |
408 | char *mesg, int mlen) | |
409 | { | |
410 | /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ | |
411 | char *buf = mesg; | |
683428fa | 412 | int id; |
1da177e4 LT |
413 | int len, rv; |
414 | struct rsc rsci, *rscp = NULL; | |
415 | time_t expiry; | |
416 | int status = -EINVAL; | |
1df0cada | 417 | struct gss_api_mech *gm = NULL; |
1da177e4 LT |
418 | |
419 | memset(&rsci, 0, sizeof(rsci)); | |
420 | /* context handle */ | |
421 | len = qword_get(&mesg, buf, mlen); | |
422 | if (len < 0) goto out; | |
423 | status = -ENOMEM; | |
424 | if (dup_to_netobj(&rsci.handle, buf, len)) | |
425 | goto out; | |
426 | ||
427 | rsci.h.flags = 0; | |
428 | /* expiry */ | |
429 | expiry = get_expiry(&mesg); | |
430 | status = -EINVAL; | |
431 | if (expiry == 0) | |
432 | goto out; | |
433 | ||
a1db410d | 434 | rscp = rsc_lookup(cd, &rsci); |
17f834b6 N |
435 | if (!rscp) |
436 | goto out; | |
437 | ||
1da177e4 | 438 | /* uid, or NEGATIVE */ |
683428fa | 439 | rv = get_int(&mesg, &id); |
1da177e4 LT |
440 | if (rv == -EINVAL) |
441 | goto out; | |
442 | if (rv == -ENOENT) | |
443 | set_bit(CACHE_NEGATIVE, &rsci.h.flags); | |
444 | else { | |
445 | int N, i; | |
1da177e4 | 446 | |
3c34ae11 BF |
447 | /* |
448 | * NOTE: we skip uid_valid()/gid_valid() checks here: | |
449 | * instead, * -1 id's are later mapped to the | |
450 | * (export-specific) anonymous id by nfsd_setuser. | |
451 | * | |
452 | * (But supplementary gid's get no such special | |
453 | * treatment so are checked for validity here.) | |
454 | */ | |
683428fa EB |
455 | /* uid */ |
456 | rsci.cred.cr_uid = make_kuid(&init_user_ns, id); | |
683428fa | 457 | |
1da177e4 | 458 | /* gid */ |
683428fa EB |
459 | if (get_int(&mesg, &id)) |
460 | goto out; | |
461 | rsci.cred.cr_gid = make_kgid(&init_user_ns, id); | |
1da177e4 LT |
462 | |
463 | /* number of additional gid's */ | |
464 | if (get_int(&mesg, &N)) | |
465 | goto out; | |
466 | status = -ENOMEM; | |
467 | rsci.cred.cr_group_info = groups_alloc(N); | |
468 | if (rsci.cred.cr_group_info == NULL) | |
469 | goto out; | |
470 | ||
471 | /* gid's */ | |
472 | status = -EINVAL; | |
473 | for (i=0; i<N; i++) { | |
ae2975bc | 474 | kgid_t kgid; |
683428fa | 475 | if (get_int(&mesg, &id)) |
1da177e4 | 476 | goto out; |
683428fa | 477 | kgid = make_kgid(&init_user_ns, id); |
ae2975bc EB |
478 | if (!gid_valid(kgid)) |
479 | goto out; | |
480 | GROUP_AT(rsci.cred.cr_group_info, i) = kgid; | |
1da177e4 LT |
481 | } |
482 | ||
483 | /* mech name */ | |
484 | len = qword_get(&mesg, buf, mlen); | |
485 | if (len < 0) | |
486 | goto out; | |
0dc1531a | 487 | gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf); |
1da177e4 LT |
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; |
400f26b5 SS |
497 | status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, |
498 | NULL, GFP_KERNEL); | |
1df0cada | 499 | if (status) |
1da177e4 | 500 | goto out; |
68e76ad0 OK |
501 | |
502 | /* get client name */ | |
503 | len = qword_get(&mesg, buf, mlen); | |
504 | if (len > 0) { | |
03a4e1f6 | 505 | rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); |
1eb6d622 WY |
506 | if (!rsci.cred.cr_principal) { |
507 | status = -ENOMEM; | |
68e76ad0 | 508 | goto out; |
1eb6d622 | 509 | } |
68e76ad0 OK |
510 | } |
511 | ||
1da177e4 LT |
512 | } |
513 | rsci.h.expiry_time = expiry; | |
a1db410d | 514 | rscp = rsc_update(cd, &rsci, rscp); |
1da177e4 LT |
515 | status = 0; |
516 | out: | |
517 | rsc_free(&rsci); | |
518 | if (rscp) | |
a1db410d | 519 | cache_put(&rscp->h, cd); |
17f834b6 N |
520 | else |
521 | status = -ENOMEM; | |
1da177e4 LT |
522 | return status; |
523 | } | |
524 | ||
a1db410d | 525 | static struct cache_detail rsc_cache_template = { |
f35279d3 | 526 | .owner = THIS_MODULE, |
1da177e4 | 527 | .hash_size = RSC_HASHMAX, |
1da177e4 LT |
528 | .name = "auth.rpcsec.context", |
529 | .cache_put = rsc_put, | |
530 | .cache_parse = rsc_parse, | |
17f834b6 N |
531 | .match = rsc_match, |
532 | .init = rsc_init, | |
533 | .update = update_rsc, | |
534 | .alloc = rsc_alloc, | |
1da177e4 LT |
535 | }; |
536 | ||
a1db410d | 537 | static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) |
17f834b6 N |
538 | { |
539 | struct cache_head *ch; | |
540 | int hash = rsc_hash(item); | |
541 | ||
a1db410d | 542 | ch = sunrpc_cache_lookup(cd, &item->h, hash); |
17f834b6 N |
543 | if (ch) |
544 | return container_of(ch, struct rsc, h); | |
545 | else | |
546 | return NULL; | |
547 | } | |
548 | ||
a1db410d | 549 | static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) |
17f834b6 N |
550 | { |
551 | struct cache_head *ch; | |
552 | int hash = rsc_hash(new); | |
553 | ||
a1db410d | 554 | ch = sunrpc_cache_update(cd, &new->h, |
17f834b6 N |
555 | &old->h, hash); |
556 | if (ch) | |
557 | return container_of(ch, struct rsc, h); | |
558 | else | |
559 | return NULL; | |
560 | } | |
561 | ||
1da177e4 LT |
562 | |
563 | static struct rsc * | |
a1db410d | 564 | gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) |
1da177e4 LT |
565 | { |
566 | struct rsc rsci; | |
567 | struct rsc *found; | |
568 | ||
569 | memset(&rsci, 0, sizeof(rsci)); | |
570 | if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) | |
571 | return NULL; | |
a1db410d | 572 | found = rsc_lookup(cd, &rsci); |
1da177e4 LT |
573 | rsc_free(&rsci); |
574 | if (!found) | |
575 | return NULL; | |
a1db410d | 576 | if (cache_check(cd, &found->h, NULL)) |
1da177e4 LT |
577 | return NULL; |
578 | return found; | |
579 | } | |
580 | ||
581 | /* Implements sequence number algorithm as specified in RFC 2203. */ | |
582 | static int | |
583 | gss_check_seq_num(struct rsc *rsci, int seq_num) | |
584 | { | |
585 | struct gss_svc_seq_data *sd = &rsci->seqdata; | |
586 | ||
587 | spin_lock(&sd->sd_lock); | |
588 | if (seq_num > sd->sd_max) { | |
589 | if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { | |
590 | memset(sd->sd_win,0,sizeof(sd->sd_win)); | |
591 | sd->sd_max = seq_num; | |
592 | } else while (sd->sd_max < seq_num) { | |
593 | sd->sd_max++; | |
594 | __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); | |
595 | } | |
596 | __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); | |
597 | goto ok; | |
598 | } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { | |
599 | goto drop; | |
600 | } | |
601 | /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ | |
602 | if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) | |
603 | goto drop; | |
604 | ok: | |
605 | spin_unlock(&sd->sd_lock); | |
606 | return 1; | |
607 | drop: | |
608 | spin_unlock(&sd->sd_lock); | |
609 | return 0; | |
610 | } | |
611 | ||
612 | static inline u32 round_up_to_quad(u32 i) | |
613 | { | |
614 | return (i + 3 ) & ~3; | |
615 | } | |
616 | ||
617 | static inline int | |
618 | svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) | |
619 | { | |
620 | int l; | |
621 | ||
622 | if (argv->iov_len < 4) | |
623 | return -1; | |
76994313 | 624 | o->len = svc_getnl(argv); |
1da177e4 LT |
625 | l = round_up_to_quad(o->len); |
626 | if (argv->iov_len < l) | |
627 | return -1; | |
628 | o->data = argv->iov_base; | |
629 | argv->iov_base += l; | |
630 | argv->iov_len -= l; | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static inline int | |
635 | svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) | |
636 | { | |
753ed90d | 637 | u8 *p; |
1da177e4 LT |
638 | |
639 | if (resv->iov_len + 4 > PAGE_SIZE) | |
640 | return -1; | |
76994313 | 641 | svc_putnl(resv, o->len); |
1da177e4 LT |
642 | p = resv->iov_base + resv->iov_len; |
643 | resv->iov_len += round_up_to_quad(o->len); | |
644 | if (resv->iov_len > PAGE_SIZE) | |
645 | return -1; | |
646 | memcpy(p, o->data, o->len); | |
753ed90d | 647 | memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); |
1da177e4 LT |
648 | return 0; |
649 | } | |
650 | ||
21fcd02b BF |
651 | /* |
652 | * Verify the checksum on the header and return SVC_OK on success. | |
1da177e4 LT |
653 | * Otherwise, return SVC_DROP (in the case of a bad sequence number) |
654 | * or return SVC_DENIED and indicate error in authp. | |
655 | */ | |
656 | static int | |
657 | gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, | |
d8ed029d | 658 | __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) |
1da177e4 LT |
659 | { |
660 | struct gss_ctx *ctx_id = rsci->mechctx; | |
661 | struct xdr_buf rpchdr; | |
662 | struct xdr_netobj checksum; | |
663 | u32 flavor = 0; | |
664 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
665 | struct kvec iov; | |
666 | ||
667 | /* data to compute the checksum over: */ | |
668 | iov.iov_base = rpcstart; | |
669 | iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; | |
670 | xdr_buf_from_iov(&iov, &rpchdr); | |
671 | ||
672 | *authp = rpc_autherr_badverf; | |
673 | if (argv->iov_len < 4) | |
674 | return SVC_DENIED; | |
76994313 | 675 | flavor = svc_getnl(argv); |
1da177e4 LT |
676 | if (flavor != RPC_AUTH_GSS) |
677 | return SVC_DENIED; | |
678 | if (svc_safe_getnetobj(argv, &checksum)) | |
679 | return SVC_DENIED; | |
680 | ||
681 | if (rqstp->rq_deferred) /* skip verification of revisited request */ | |
682 | return SVC_OK; | |
00fd6e14 | 683 | if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { |
1da177e4 LT |
684 | *authp = rpcsec_gsserr_credproblem; |
685 | return SVC_DENIED; | |
686 | } | |
687 | ||
688 | if (gc->gc_seq > MAXSEQ) { | |
8885cb36 CL |
689 | dprintk("RPC: svcauth_gss: discarding request with " |
690 | "large sequence number %d\n", gc->gc_seq); | |
1da177e4 LT |
691 | *authp = rpcsec_gsserr_ctxproblem; |
692 | return SVC_DENIED; | |
693 | } | |
694 | if (!gss_check_seq_num(rsci, gc->gc_seq)) { | |
8885cb36 CL |
695 | dprintk("RPC: svcauth_gss: discarding request with " |
696 | "old sequence number %d\n", gc->gc_seq); | |
1da177e4 LT |
697 | return SVC_DROP; |
698 | } | |
699 | return SVC_OK; | |
700 | } | |
701 | ||
822f1005 AA |
702 | static int |
703 | gss_write_null_verf(struct svc_rqst *rqstp) | |
704 | { | |
d8ed029d | 705 | __be32 *p; |
822f1005 | 706 | |
76994313 | 707 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); |
822f1005 AA |
708 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; |
709 | /* don't really need to check if head->iov_len > PAGE_SIZE ... */ | |
710 | *p++ = 0; | |
711 | if (!xdr_ressize_check(rqstp, p)) | |
712 | return -1; | |
713 | return 0; | |
714 | } | |
715 | ||
1da177e4 LT |
716 | static int |
717 | gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) | |
718 | { | |
d8ed029d | 719 | __be32 xdr_seq; |
1da177e4 LT |
720 | u32 maj_stat; |
721 | struct xdr_buf verf_data; | |
722 | struct xdr_netobj mic; | |
d8ed029d | 723 | __be32 *p; |
1da177e4 LT |
724 | struct kvec iov; |
725 | ||
76994313 | 726 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); |
1da177e4 LT |
727 | xdr_seq = htonl(seq); |
728 | ||
729 | iov.iov_base = &xdr_seq; | |
730 | iov.iov_len = sizeof(xdr_seq); | |
731 | xdr_buf_from_iov(&iov, &verf_data); | |
732 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; | |
733 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 734 | maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); |
1da177e4 LT |
735 | if (maj_stat != GSS_S_COMPLETE) |
736 | return -1; | |
737 | *p++ = htonl(mic.len); | |
738 | memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); | |
739 | p += XDR_QUADLEN(mic.len); | |
740 | if (!xdr_ressize_check(rqstp, p)) | |
741 | return -1; | |
742 | return 0; | |
743 | } | |
744 | ||
745 | struct gss_domain { | |
746 | struct auth_domain h; | |
747 | u32 pseudoflavor; | |
748 | }; | |
749 | ||
750 | static struct auth_domain * | |
751 | find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) | |
752 | { | |
753 | char *name; | |
754 | ||
755 | name = gss_service_to_auth_domain_name(ctx->mech_type, svc); | |
756 | if (!name) | |
757 | return NULL; | |
758 | return auth_domain_find(name); | |
759 | } | |
760 | ||
efc36aa5 N |
761 | static struct auth_ops svcauthops_gss; |
762 | ||
4796f457 BF |
763 | u32 svcauth_gss_flavor(struct auth_domain *dom) |
764 | { | |
765 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); | |
766 | ||
767 | return gd->pseudoflavor; | |
768 | } | |
769 | ||
7bd88269 | 770 | EXPORT_SYMBOL_GPL(svcauth_gss_flavor); |
4796f457 | 771 | |
1da177e4 LT |
772 | int |
773 | svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) | |
774 | { | |
775 | struct gss_domain *new; | |
776 | struct auth_domain *test; | |
777 | int stat = -ENOMEM; | |
778 | ||
779 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
780 | if (!new) | |
781 | goto out; | |
efc36aa5 | 782 | kref_init(&new->h.ref); |
e69062b4 | 783 | new->h.name = kstrdup(name, GFP_KERNEL); |
1da177e4 LT |
784 | if (!new->h.name) |
785 | goto out_free_dom; | |
efc36aa5 | 786 | new->h.flavour = &svcauthops_gss; |
1da177e4 | 787 | new->pseudoflavor = pseudoflavor; |
1da177e4 | 788 | |
cb276805 | 789 | stat = 0; |
efc36aa5 | 790 | test = auth_domain_lookup(name, &new->h); |
cb276805 BF |
791 | if (test != &new->h) { /* Duplicate registration */ |
792 | auth_domain_put(test); | |
793 | kfree(new->h.name); | |
794 | goto out_free_dom; | |
1da177e4 LT |
795 | } |
796 | return 0; | |
797 | ||
798 | out_free_dom: | |
799 | kfree(new); | |
800 | out: | |
801 | return stat; | |
802 | } | |
803 | ||
7bd88269 | 804 | EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); |
1da177e4 LT |
805 | |
806 | static inline int | |
807 | read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) | |
808 | { | |
d8ed029d | 809 | __be32 raw; |
1da177e4 LT |
810 | int status; |
811 | ||
812 | status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); | |
813 | if (status) | |
814 | return status; | |
815 | *obj = ntohl(raw); | |
816 | return 0; | |
817 | } | |
818 | ||
819 | /* It would be nice if this bit of code could be shared with the client. | |
820 | * Obstacles: | |
821 | * The client shouldn't malloc(), would have to pass in own memory. | |
822 | * The server uses base of head iovec as read pointer, while the | |
823 | * client uses separate pointer. */ | |
824 | static int | |
4c190e2f | 825 | unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) |
1da177e4 LT |
826 | { |
827 | int stat = -EINVAL; | |
828 | u32 integ_len, maj_stat; | |
829 | struct xdr_netobj mic; | |
830 | struct xdr_buf integ_buf; | |
831 | ||
4c190e2f JL |
832 | /* Did we already verify the signature on the original pass through? */ |
833 | if (rqstp->rq_deferred) | |
834 | return 0; | |
835 | ||
76994313 | 836 | integ_len = svc_getnl(&buf->head[0]); |
1da177e4 | 837 | if (integ_len & 3) |
b797b5be | 838 | return stat; |
1da177e4 | 839 | if (integ_len > buf->len) |
b797b5be | 840 | return stat; |
1da177e4 LT |
841 | if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) |
842 | BUG(); | |
843 | /* copy out mic... */ | |
844 | if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) | |
845 | BUG(); | |
846 | if (mic.len > RPC_MAX_AUTH_SIZE) | |
b797b5be | 847 | return stat; |
1da177e4 LT |
848 | mic.data = kmalloc(mic.len, GFP_KERNEL); |
849 | if (!mic.data) | |
b797b5be | 850 | return stat; |
1da177e4 LT |
851 | if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) |
852 | goto out; | |
00fd6e14 | 853 | maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); |
1da177e4 LT |
854 | if (maj_stat != GSS_S_COMPLETE) |
855 | goto out; | |
76994313 | 856 | if (svc_getnl(&buf->head[0]) != seq) |
1da177e4 | 857 | goto out; |
4c190e2f JL |
858 | /* trim off the mic at the end before returning */ |
859 | xdr_buf_trim(buf, mic.len + 4); | |
1da177e4 LT |
860 | stat = 0; |
861 | out: | |
b797b5be | 862 | kfree(mic.data); |
1da177e4 LT |
863 | return stat; |
864 | } | |
865 | ||
7c9fdcfb BF |
866 | static inline int |
867 | total_buf_len(struct xdr_buf *buf) | |
868 | { | |
869 | return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; | |
870 | } | |
871 | ||
872 | static void | |
873 | fix_priv_head(struct xdr_buf *buf, int pad) | |
874 | { | |
875 | if (buf->page_len == 0) { | |
876 | /* We need to adjust head and buf->len in tandem in this | |
877 | * case to make svc_defer() work--it finds the original | |
878 | * buffer start using buf->len - buf->head[0].iov_len. */ | |
879 | buf->head[0].iov_len -= pad; | |
880 | } | |
881 | } | |
882 | ||
883 | static int | |
884 | unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) | |
885 | { | |
886 | u32 priv_len, maj_stat; | |
887 | int pad, saved_len, remaining_len, offset; | |
888 | ||
cf8208d0 | 889 | rqstp->rq_splice_ok = 0; |
7c9fdcfb | 890 | |
76994313 | 891 | priv_len = svc_getnl(&buf->head[0]); |
7c9fdcfb BF |
892 | if (rqstp->rq_deferred) { |
893 | /* Already decrypted last time through! The sequence number | |
894 | * check at out_seq is unnecessary but harmless: */ | |
895 | goto out_seq; | |
896 | } | |
897 | /* buf->len is the number of bytes from the original start of the | |
898 | * request to the end, where head[0].iov_len is just the bytes | |
899 | * not yet read from the head, so these two values are different: */ | |
900 | remaining_len = total_buf_len(buf); | |
901 | if (priv_len > remaining_len) | |
902 | return -EINVAL; | |
903 | pad = remaining_len - priv_len; | |
904 | buf->len -= pad; | |
905 | fix_priv_head(buf, pad); | |
906 | ||
907 | /* Maybe it would be better to give gss_unwrap a length parameter: */ | |
908 | saved_len = buf->len; | |
909 | buf->len = priv_len; | |
910 | maj_stat = gss_unwrap(ctx, 0, buf); | |
911 | pad = priv_len - buf->len; | |
912 | buf->len = saved_len; | |
913 | buf->len -= pad; | |
914 | /* The upper layers assume the buffer is aligned on 4-byte boundaries. | |
915 | * In the krb5p case, at least, the data ends up offset, so we need to | |
916 | * move it around. */ | |
917 | /* XXX: This is very inefficient. It would be better to either do | |
918 | * this while we encrypt, or maybe in the receive code, if we can peak | |
919 | * ahead and work out the service and mechanism there. */ | |
920 | offset = buf->head[0].iov_len % 4; | |
921 | if (offset) { | |
922 | buf->buflen = RPCSVC_MAXPAYLOAD; | |
923 | xdr_shift_buf(buf, offset); | |
924 | fix_priv_head(buf, pad); | |
925 | } | |
926 | if (maj_stat != GSS_S_COMPLETE) | |
927 | return -EINVAL; | |
928 | out_seq: | |
76994313 | 929 | if (svc_getnl(&buf->head[0]) != seq) |
7c9fdcfb BF |
930 | return -EINVAL; |
931 | return 0; | |
932 | } | |
933 | ||
1da177e4 LT |
934 | struct gss_svc_data { |
935 | /* decoded gss client cred: */ | |
936 | struct rpc_gss_wire_cred clcred; | |
5b304bc5 BF |
937 | /* save a pointer to the beginning of the encoded verifier, |
938 | * for use in encryption/checksumming in svcauth_gss_release: */ | |
939 | __be32 *verf_start; | |
1da177e4 LT |
940 | struct rsc *rsci; |
941 | }; | |
942 | ||
943 | static int | |
944 | svcauth_gss_set_client(struct svc_rqst *rqstp) | |
945 | { | |
946 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; | |
947 | struct rsc *rsci = svcdata->rsci; | |
948 | struct rpc_gss_wire_cred *gc = &svcdata->clcred; | |
3ab4d8b1 | 949 | int stat; |
1da177e4 | 950 | |
3ab4d8b1 BF |
951 | /* |
952 | * A gss export can be specified either by: | |
953 | * export *(sec=krb5,rw) | |
954 | * or by | |
955 | * export gss/krb5(rw) | |
956 | * The latter is deprecated; but for backwards compatibility reasons | |
957 | * the nfsd code will still fall back on trying it if the former | |
958 | * doesn't work; so we try to make both available to nfsd, below. | |
959 | */ | |
960 | rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); | |
961 | if (rqstp->rq_gssclient == NULL) | |
1da177e4 | 962 | return SVC_DENIED; |
3ab4d8b1 | 963 | stat = svcauth_unix_set_client(rqstp); |
1ebede86 | 964 | if (stat == SVC_DROP || stat == SVC_CLOSE) |
3ab4d8b1 | 965 | return stat; |
1da177e4 LT |
966 | return SVC_OK; |
967 | } | |
968 | ||
91a4762e | 969 | static inline int |
fc2952a2 SS |
970 | gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, |
971 | struct xdr_netobj *out_handle, int *major_status) | |
91a4762e KC |
972 | { |
973 | struct rsc *rsci; | |
54f9247b | 974 | int rc; |
91a4762e | 975 | |
fc2952a2 | 976 | if (*major_status != GSS_S_COMPLETE) |
91a4762e | 977 | return gss_write_null_verf(rqstp); |
fc2952a2 | 978 | rsci = gss_svc_searchbyctx(cd, out_handle); |
91a4762e | 979 | if (rsci == NULL) { |
fc2952a2 | 980 | *major_status = GSS_S_NO_CONTEXT; |
91a4762e KC |
981 | return gss_write_null_verf(rqstp); |
982 | } | |
54f9247b | 983 | rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); |
a1db410d | 984 | cache_put(&rsci->h, cd); |
54f9247b | 985 | return rc; |
91a4762e KC |
986 | } |
987 | ||
fc2952a2 | 988 | static inline int |
030d794b SS |
989 | gss_read_common_verf(struct rpc_gss_wire_cred *gc, |
990 | struct kvec *argv, __be32 *authp, | |
991 | struct xdr_netobj *in_handle) | |
21fcd02b | 992 | { |
21fcd02b BF |
993 | /* Read the verifier; should be NULL: */ |
994 | *authp = rpc_autherr_badverf; | |
995 | if (argv->iov_len < 2 * 4) | |
996 | return SVC_DENIED; | |
997 | if (svc_getnl(argv) != RPC_AUTH_NULL) | |
998 | return SVC_DENIED; | |
999 | if (svc_getnl(argv) != 0) | |
1000 | return SVC_DENIED; | |
21fcd02b BF |
1001 | /* Martial context handle and token for upcall: */ |
1002 | *authp = rpc_autherr_badcred; | |
1003 | if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) | |
1004 | return SVC_DENIED; | |
fc2952a2 | 1005 | if (dup_netobj(in_handle, &gc->gc_ctx)) |
1ebede86 | 1006 | return SVC_CLOSE; |
21fcd02b | 1007 | *authp = rpc_autherr_badverf; |
030d794b SS |
1008 | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | static inline int | |
1013 | gss_read_verf(struct rpc_gss_wire_cred *gc, | |
1014 | struct kvec *argv, __be32 *authp, | |
1015 | struct xdr_netobj *in_handle, | |
1016 | struct xdr_netobj *in_token) | |
1017 | { | |
1018 | struct xdr_netobj tmpobj; | |
1019 | int res; | |
1020 | ||
1021 | res = gss_read_common_verf(gc, argv, authp, in_handle); | |
1022 | if (res) | |
1023 | return res; | |
1024 | ||
21fcd02b | 1025 | if (svc_safe_getnetobj(argv, &tmpobj)) { |
fc2952a2 | 1026 | kfree(in_handle->data); |
21fcd02b BF |
1027 | return SVC_DENIED; |
1028 | } | |
fc2952a2 SS |
1029 | if (dup_netobj(in_token, &tmpobj)) { |
1030 | kfree(in_handle->data); | |
1ebede86 | 1031 | return SVC_CLOSE; |
21fcd02b BF |
1032 | } |
1033 | ||
fc2952a2 SS |
1034 | return 0; |
1035 | } | |
1036 | ||
030d794b SS |
1037 | /* Ok this is really heavily depending on a set of semantics in |
1038 | * how rqstp is set up by svc_recv and pages laid down by the | |
1039 | * server when reading a request. We are basically guaranteed that | |
1040 | * the token lays all down linearly across a set of pages, starting | |
1041 | * at iov_base in rq_arg.head[0] which happens to be the first of a | |
1042 | * set of pages stored in rq_pages[]. | |
1043 | * rq_arg.head[0].iov_base will provide us the page_base to pass | |
1044 | * to the upcall. | |
1045 | */ | |
1046 | static inline int | |
1047 | gss_read_proxy_verf(struct svc_rqst *rqstp, | |
1048 | struct rpc_gss_wire_cred *gc, __be32 *authp, | |
1049 | struct xdr_netobj *in_handle, | |
1050 | struct gssp_in_token *in_token) | |
1051 | { | |
1052 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1053 | u32 inlen; | |
1054 | int res; | |
1055 | ||
1056 | res = gss_read_common_verf(gc, argv, authp, in_handle); | |
1057 | if (res) | |
1058 | return res; | |
1059 | ||
1060 | inlen = svc_getnl(argv); | |
1061 | if (inlen > (argv->iov_len + rqstp->rq_arg.page_len)) | |
1062 | return SVC_DENIED; | |
1063 | ||
1064 | in_token->pages = rqstp->rq_pages; | |
1065 | in_token->page_base = (ulong)argv->iov_base & ~PAGE_MASK; | |
1066 | in_token->page_len = inlen; | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | ||
fc2952a2 SS |
1071 | static inline int |
1072 | gss_write_resv(struct kvec *resv, size_t size_limit, | |
1073 | struct xdr_netobj *out_handle, struct xdr_netobj *out_token, | |
1074 | int major_status, int minor_status) | |
1075 | { | |
1076 | if (resv->iov_len + 4 > size_limit) | |
1077 | return -1; | |
1078 | svc_putnl(resv, RPC_SUCCESS); | |
1079 | if (svc_safe_putnetobj(resv, out_handle)) | |
1080 | return -1; | |
1081 | if (resv->iov_len + 3 * 4 > size_limit) | |
1082 | return -1; | |
1083 | svc_putnl(resv, major_status); | |
1084 | svc_putnl(resv, minor_status); | |
1085 | svc_putnl(resv, GSS_SEQ_WIN); | |
1086 | if (svc_safe_putnetobj(resv, out_token)) | |
1087 | return -1; | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * Having read the cred already and found we're in the context | |
1093 | * initiation case, read the verifier and initiate (or check the results | |
1094 | * of) upcalls to userspace for help with context initiation. If | |
1095 | * the upcall results are available, write the verifier and result. | |
1096 | * Otherwise, drop the request pending an answer to the upcall. | |
1097 | */ | |
030d794b | 1098 | static int svcauth_gss_legacy_init(struct svc_rqst *rqstp, |
fc2952a2 SS |
1099 | struct rpc_gss_wire_cred *gc, __be32 *authp) |
1100 | { | |
1101 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1102 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1103 | struct rsi *rsip, rsikey; | |
1104 | int ret; | |
1105 | struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); | |
1106 | ||
1107 | memset(&rsikey, 0, sizeof(rsikey)); | |
1108 | ret = gss_read_verf(gc, argv, authp, | |
1109 | &rsikey.in_handle, &rsikey.in_token); | |
1110 | if (ret) | |
1111 | return ret; | |
1112 | ||
21fcd02b | 1113 | /* Perform upcall, or find upcall result: */ |
a1db410d | 1114 | rsip = rsi_lookup(sn->rsi_cache, &rsikey); |
21fcd02b BF |
1115 | rsi_free(&rsikey); |
1116 | if (!rsip) | |
1ebede86 | 1117 | return SVC_CLOSE; |
a1db410d | 1118 | if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) |
21fcd02b | 1119 | /* No upcall result: */ |
1ebede86 | 1120 | return SVC_CLOSE; |
2ed5282c N |
1121 | |
1122 | ret = SVC_CLOSE; | |
1123 | /* Got an answer to the upcall; use it: */ | |
fc2952a2 SS |
1124 | if (gss_write_init_verf(sn->rsc_cache, rqstp, |
1125 | &rsip->out_handle, &rsip->major_status)) | |
2ed5282c | 1126 | goto out; |
fc2952a2 SS |
1127 | if (gss_write_resv(resv, PAGE_SIZE, |
1128 | &rsip->out_handle, &rsip->out_token, | |
1129 | rsip->major_status, rsip->minor_status)) | |
2ed5282c N |
1130 | goto out; |
1131 | ||
980e5a40 BF |
1132 | ret = SVC_COMPLETE; |
1133 | out: | |
a1db410d | 1134 | cache_put(&rsip->h, sn->rsi_cache); |
980e5a40 | 1135 | return ret; |
21fcd02b BF |
1136 | } |
1137 | ||
030d794b SS |
1138 | static int gss_proxy_save_rsc(struct cache_detail *cd, |
1139 | struct gssp_upcall_data *ud, | |
1140 | uint64_t *handle) | |
1141 | { | |
1142 | struct rsc rsci, *rscp = NULL; | |
1143 | static atomic64_t ctxhctr; | |
1144 | long long ctxh; | |
1145 | struct gss_api_mech *gm = NULL; | |
1146 | time_t expiry; | |
1147 | int status = -EINVAL; | |
1148 | ||
1149 | memset(&rsci, 0, sizeof(rsci)); | |
1150 | /* context handle */ | |
1151 | status = -ENOMEM; | |
1152 | /* the handle needs to be just a unique id, | |
1153 | * use a static counter */ | |
1154 | ctxh = atomic64_inc_return(&ctxhctr); | |
1155 | ||
1156 | /* make a copy for the caller */ | |
1157 | *handle = ctxh; | |
1158 | ||
1159 | /* make a copy for the rsc cache */ | |
1160 | if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t))) | |
1161 | goto out; | |
1162 | rscp = rsc_lookup(cd, &rsci); | |
1163 | if (!rscp) | |
1164 | goto out; | |
1165 | ||
1166 | /* creds */ | |
1167 | if (!ud->found_creds) { | |
1168 | /* userspace seem buggy, we should always get at least a | |
1169 | * mapping to nobody */ | |
3be34555 BF |
1170 | dprintk("RPC: No creds found!\n"); |
1171 | goto out; | |
030d794b SS |
1172 | } else { |
1173 | ||
1174 | /* steal creds */ | |
1175 | rsci.cred = ud->creds; | |
1176 | memset(&ud->creds, 0, sizeof(struct svc_cred)); | |
1177 | ||
1178 | status = -EOPNOTSUPP; | |
1179 | /* get mech handle from OID */ | |
1180 | gm = gss_mech_get_by_OID(&ud->mech_oid); | |
1181 | if (!gm) | |
1182 | goto out; | |
7193bd17 | 1183 | rsci.cred.cr_gss_mech = gm; |
030d794b SS |
1184 | |
1185 | status = -EINVAL; | |
1186 | /* mech-specific data: */ | |
1187 | status = gss_import_sec_context(ud->out_handle.data, | |
1188 | ud->out_handle.len, | |
1189 | gm, &rsci.mechctx, | |
1190 | &expiry, GFP_KERNEL); | |
1191 | if (status) | |
1192 | goto out; | |
1193 | } | |
1194 | ||
1195 | rsci.h.expiry_time = expiry; | |
1196 | rscp = rsc_update(cd, &rsci, rscp); | |
1197 | status = 0; | |
1198 | out: | |
030d794b SS |
1199 | rsc_free(&rsci); |
1200 | if (rscp) | |
1201 | cache_put(&rscp->h, cd); | |
1202 | else | |
1203 | status = -ENOMEM; | |
1204 | return status; | |
1205 | } | |
1206 | ||
1207 | static int svcauth_gss_proxy_init(struct svc_rqst *rqstp, | |
1208 | struct rpc_gss_wire_cred *gc, __be32 *authp) | |
1209 | { | |
1210 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1211 | struct xdr_netobj cli_handle; | |
1212 | struct gssp_upcall_data ud; | |
1213 | uint64_t handle; | |
1214 | int status; | |
1215 | int ret; | |
1216 | struct net *net = rqstp->rq_xprt->xpt_net; | |
1217 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1218 | ||
1219 | memset(&ud, 0, sizeof(ud)); | |
1220 | ret = gss_read_proxy_verf(rqstp, gc, authp, | |
1221 | &ud.in_handle, &ud.in_token); | |
1222 | if (ret) | |
1223 | return ret; | |
1224 | ||
1225 | ret = SVC_CLOSE; | |
1226 | ||
1227 | /* Perform synchronous upcall to gss-proxy */ | |
1228 | status = gssp_accept_sec_context_upcall(net, &ud); | |
1229 | if (status) | |
1230 | goto out; | |
1231 | ||
1232 | dprintk("RPC: svcauth_gss: gss major status = %d\n", | |
1233 | ud.major_status); | |
1234 | ||
1235 | switch (ud.major_status) { | |
1236 | case GSS_S_CONTINUE_NEEDED: | |
1237 | cli_handle = ud.out_handle; | |
1238 | break; | |
1239 | case GSS_S_COMPLETE: | |
1240 | status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle); | |
1241 | if (status) | |
1242 | goto out; | |
1243 | cli_handle.data = (u8 *)&handle; | |
1244 | cli_handle.len = sizeof(handle); | |
1245 | break; | |
1246 | default: | |
1247 | ret = SVC_CLOSE; | |
1248 | goto out; | |
1249 | } | |
1250 | ||
1251 | /* Got an answer to the upcall; use it: */ | |
1252 | if (gss_write_init_verf(sn->rsc_cache, rqstp, | |
1253 | &cli_handle, &ud.major_status)) | |
1254 | goto out; | |
1255 | if (gss_write_resv(resv, PAGE_SIZE, | |
1256 | &cli_handle, &ud.out_token, | |
1257 | ud.major_status, ud.minor_status)) | |
1258 | goto out; | |
1259 | ||
1260 | ret = SVC_COMPLETE; | |
1261 | out: | |
1262 | gssp_free_upcall_data(&ud); | |
1263 | return ret; | |
1264 | } | |
1265 | ||
0fdc2678 JL |
1266 | /* |
1267 | * Try to set the sn->use_gss_proxy variable to a new value. We only allow | |
1268 | * it to be changed if it's currently undefined (-1). If it's any other value | |
1269 | * then return -EBUSY unless the type wouldn't have changed anyway. | |
1270 | */ | |
1271 | static int set_gss_proxy(struct net *net, int type) | |
030d794b SS |
1272 | { |
1273 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
0fdc2678 | 1274 | int ret; |
030d794b | 1275 | |
0fdc2678 JL |
1276 | WARN_ON_ONCE(type != 0 && type != 1); |
1277 | ret = cmpxchg(&sn->use_gss_proxy, -1, type); | |
1278 | if (ret != -1 && ret != type) | |
1279 | return -EBUSY; | |
030d794b SS |
1280 | return 0; |
1281 | } | |
1282 | ||
0fdc2678 | 1283 | static bool use_gss_proxy(struct net *net) |
030d794b SS |
1284 | { |
1285 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
030d794b | 1286 | |
0fdc2678 JL |
1287 | /* If use_gss_proxy is still undefined, then try to disable it */ |
1288 | if (sn->use_gss_proxy == -1) | |
1289 | set_gss_proxy(net, 0); | |
1290 | return sn->use_gss_proxy; | |
030d794b SS |
1291 | } |
1292 | ||
0fdc2678 JL |
1293 | #ifdef CONFIG_PROC_FS |
1294 | ||
030d794b SS |
1295 | static ssize_t write_gssp(struct file *file, const char __user *buf, |
1296 | size_t count, loff_t *ppos) | |
1297 | { | |
e77e4300 | 1298 | struct net *net = PDE_DATA(file_inode(file)); |
030d794b SS |
1299 | char tbuf[20]; |
1300 | unsigned long i; | |
1301 | int res; | |
1302 | ||
1303 | if (*ppos || count > sizeof(tbuf)-1) | |
1304 | return -EINVAL; | |
1305 | if (copy_from_user(tbuf, buf, count)) | |
1306 | return -EFAULT; | |
1307 | ||
1308 | tbuf[count] = 0; | |
1309 | res = kstrtoul(tbuf, 0, &i); | |
1310 | if (res) | |
1311 | return res; | |
1312 | if (i != 1) | |
1313 | return -EINVAL; | |
a92e5eb1 | 1314 | res = set_gssp_clnt(net); |
030d794b SS |
1315 | if (res) |
1316 | return res; | |
a92e5eb1 | 1317 | res = set_gss_proxy(net, 1); |
030d794b SS |
1318 | if (res) |
1319 | return res; | |
1320 | return count; | |
1321 | } | |
1322 | ||
1323 | static ssize_t read_gssp(struct file *file, char __user *buf, | |
1324 | size_t count, loff_t *ppos) | |
1325 | { | |
e77e4300 | 1326 | struct net *net = PDE_DATA(file_inode(file)); |
1654a04c | 1327 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
030d794b SS |
1328 | unsigned long p = *ppos; |
1329 | char tbuf[10]; | |
1330 | size_t len; | |
030d794b | 1331 | |
1654a04c | 1332 | snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy); |
030d794b SS |
1333 | len = strlen(tbuf); |
1334 | if (p >= len) | |
1335 | return 0; | |
1336 | len -= p; | |
1337 | if (len > count) | |
1338 | len = count; | |
1339 | if (copy_to_user(buf, (void *)(tbuf+p), len)) | |
1340 | return -EFAULT; | |
1341 | *ppos += len; | |
1342 | return len; | |
1343 | } | |
1344 | ||
1345 | static const struct file_operations use_gss_proxy_ops = { | |
1346 | .open = nonseekable_open, | |
1347 | .write = write_gssp, | |
1348 | .read = read_gssp, | |
1349 | }; | |
1350 | ||
1351 | static int create_use_gss_proxy_proc_entry(struct net *net) | |
1352 | { | |
1353 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1354 | struct proc_dir_entry **p = &sn->use_gssp_proc; | |
1355 | ||
1356 | sn->use_gss_proxy = -1; | |
1357 | *p = proc_create_data("use-gss-proxy", S_IFREG|S_IRUSR|S_IWUSR, | |
1358 | sn->proc_net_rpc, | |
1359 | &use_gss_proxy_ops, net); | |
1360 | if (!*p) | |
1361 | return -ENOMEM; | |
1362 | init_gssp_clnt(sn); | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | static void destroy_use_gss_proxy_proc_entry(struct net *net) | |
1367 | { | |
1368 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1369 | ||
1370 | if (sn->use_gssp_proc) { | |
1371 | remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); | |
1372 | clear_gssp_clnt(sn); | |
1373 | } | |
1374 | } | |
0ff3bab5 BF |
1375 | #else /* CONFIG_PROC_FS */ |
1376 | ||
1377 | static int create_use_gss_proxy_proc_entry(struct net *net) | |
1378 | { | |
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | static void destroy_use_gss_proxy_proc_entry(struct net *net) {} | |
030d794b SS |
1383 | |
1384 | #endif /* CONFIG_PROC_FS */ | |
1385 | ||
1da177e4 LT |
1386 | /* |
1387 | * Accept an rpcsec packet. | |
1388 | * If context establishment, punt to user space | |
1389 | * If data exchange, verify/decrypt | |
1390 | * If context destruction, handle here | |
1391 | * In the context establishment and destruction case we encode | |
1392 | * response here and return SVC_COMPLETE. | |
1393 | */ | |
1394 | static int | |
d8ed029d | 1395 | svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) |
1da177e4 LT |
1396 | { |
1397 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1398 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1399 | u32 crlen; | |
1da177e4 LT |
1400 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; |
1401 | struct rpc_gss_wire_cred *gc; | |
1402 | struct rsc *rsci = NULL; | |
d8ed029d AD |
1403 | __be32 *rpcstart; |
1404 | __be32 *reject_stat = resv->iov_base + resv->iov_len; | |
1da177e4 | 1405 | int ret; |
a1db410d | 1406 | struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); |
1da177e4 | 1407 | |
8885cb36 CL |
1408 | dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", |
1409 | argv->iov_len); | |
1da177e4 LT |
1410 | |
1411 | *authp = rpc_autherr_badcred; | |
1412 | if (!svcdata) | |
1413 | svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); | |
1414 | if (!svcdata) | |
1415 | goto auth_err; | |
1416 | rqstp->rq_auth_data = svcdata; | |
5b304bc5 | 1417 | svcdata->verf_start = NULL; |
1da177e4 LT |
1418 | svcdata->rsci = NULL; |
1419 | gc = &svcdata->clcred; | |
1420 | ||
1421 | /* start of rpc packet is 7 u32's back from here: | |
1422 | * xid direction rpcversion prog vers proc flavour | |
1423 | */ | |
1424 | rpcstart = argv->iov_base; | |
1425 | rpcstart -= 7; | |
1426 | ||
1427 | /* credential is: | |
1428 | * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle | |
25985edc | 1429 | * at least 5 u32s, and is preceded by length, so that makes 6. |
1da177e4 LT |
1430 | */ |
1431 | ||
1432 | if (argv->iov_len < 5 * 4) | |
1433 | goto auth_err; | |
76994313 AD |
1434 | crlen = svc_getnl(argv); |
1435 | if (svc_getnl(argv) != RPC_GSS_VERSION) | |
1da177e4 | 1436 | goto auth_err; |
76994313 AD |
1437 | gc->gc_proc = svc_getnl(argv); |
1438 | gc->gc_seq = svc_getnl(argv); | |
1439 | gc->gc_svc = svc_getnl(argv); | |
1da177e4 LT |
1440 | if (svc_safe_getnetobj(argv, &gc->gc_ctx)) |
1441 | goto auth_err; | |
1442 | if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) | |
1443 | goto auth_err; | |
1444 | ||
1445 | if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) | |
1446 | goto auth_err; | |
1447 | ||
1da177e4 LT |
1448 | *authp = rpc_autherr_badverf; |
1449 | switch (gc->gc_proc) { | |
1450 | case RPC_GSS_PROC_INIT: | |
1451 | case RPC_GSS_PROC_CONTINUE_INIT: | |
030d794b SS |
1452 | if (use_gss_proxy(SVC_NET(rqstp))) |
1453 | return svcauth_gss_proxy_init(rqstp, gc, authp); | |
1454 | else | |
1455 | return svcauth_gss_legacy_init(rqstp, gc, authp); | |
1da177e4 LT |
1456 | case RPC_GSS_PROC_DATA: |
1457 | case RPC_GSS_PROC_DESTROY: | |
21fcd02b | 1458 | /* Look up the context, and check the verifier: */ |
1da177e4 | 1459 | *authp = rpcsec_gsserr_credproblem; |
a1db410d | 1460 | rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); |
1da177e4 LT |
1461 | if (!rsci) |
1462 | goto auth_err; | |
1463 | switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { | |
1464 | case SVC_OK: | |
1465 | break; | |
1466 | case SVC_DENIED: | |
1467 | goto auth_err; | |
1468 | case SVC_DROP: | |
1469 | goto drop; | |
1470 | } | |
1471 | break; | |
1472 | default: | |
1473 | *authp = rpc_autherr_rejectedcred; | |
1474 | goto auth_err; | |
1475 | } | |
1476 | ||
1477 | /* now act upon the command: */ | |
1478 | switch (gc->gc_proc) { | |
1da177e4 | 1479 | case RPC_GSS_PROC_DESTROY: |
c5e434c9 WY |
1480 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
1481 | goto auth_err; | |
cb5c7d66 | 1482 | rsci->h.expiry_time = get_seconds(); |
1da177e4 LT |
1483 | set_bit(CACHE_NEGATIVE, &rsci->h.flags); |
1484 | if (resv->iov_len + 4 > PAGE_SIZE) | |
1485 | goto drop; | |
76994313 | 1486 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 LT |
1487 | goto complete; |
1488 | case RPC_GSS_PROC_DATA: | |
1489 | *authp = rpcsec_gsserr_ctxproblem; | |
5b304bc5 | 1490 | svcdata->verf_start = resv->iov_base + resv->iov_len; |
1da177e4 LT |
1491 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
1492 | goto auth_err; | |
1493 | rqstp->rq_cred = rsci->cred; | |
1494 | get_group_info(rsci->cred.cr_group_info); | |
1495 | *authp = rpc_autherr_badcred; | |
1496 | switch (gc->gc_svc) { | |
1497 | case RPC_GSS_SVC_NONE: | |
1498 | break; | |
1499 | case RPC_GSS_SVC_INTEGRITY: | |
b620754b BF |
1500 | /* placeholders for length and seq. number: */ |
1501 | svc_putnl(resv, 0); | |
1502 | svc_putnl(resv, 0); | |
4c190e2f | 1503 | if (unwrap_integ_data(rqstp, &rqstp->rq_arg, |
1da177e4 | 1504 | gc->gc_seq, rsci->mechctx)) |
dd35210e | 1505 | goto garbage_args; |
a5cddc88 | 1506 | rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE; |
b620754b BF |
1507 | break; |
1508 | case RPC_GSS_SVC_PRIVACY: | |
1da177e4 | 1509 | /* placeholders for length and seq. number: */ |
76994313 AD |
1510 | svc_putnl(resv, 0); |
1511 | svc_putnl(resv, 0); | |
7c9fdcfb BF |
1512 | if (unwrap_priv_data(rqstp, &rqstp->rq_arg, |
1513 | gc->gc_seq, rsci->mechctx)) | |
dd35210e | 1514 | goto garbage_args; |
a5cddc88 | 1515 | rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2; |
7c9fdcfb | 1516 | break; |
1da177e4 LT |
1517 | default: |
1518 | goto auth_err; | |
1519 | } | |
1520 | svcdata->rsci = rsci; | |
1521 | cache_get(&rsci->h); | |
d5497fc6 | 1522 | rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( |
83523d08 CL |
1523 | rsci->mechctx->mech_type, |
1524 | GSS_C_QOP_DEFAULT, | |
1525 | gc->gc_svc); | |
1da177e4 LT |
1526 | ret = SVC_OK; |
1527 | goto out; | |
1528 | } | |
dd35210e | 1529 | garbage_args: |
dd35210e HJ |
1530 | ret = SVC_GARBAGE; |
1531 | goto out; | |
1da177e4 | 1532 | auth_err: |
21fcd02b | 1533 | /* Restore write pointer to its original value: */ |
1da177e4 LT |
1534 | xdr_ressize_check(rqstp, reject_stat); |
1535 | ret = SVC_DENIED; | |
1536 | goto out; | |
1537 | complete: | |
1538 | ret = SVC_COMPLETE; | |
1539 | goto out; | |
1540 | drop: | |
1541 | ret = SVC_DROP; | |
1542 | out: | |
1543 | if (rsci) | |
a1db410d | 1544 | cache_put(&rsci->h, sn->rsc_cache); |
1da177e4 LT |
1545 | return ret; |
1546 | } | |
1547 | ||
cfbdbab0 | 1548 | static __be32 * |
3c15a486 BF |
1549 | svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) |
1550 | { | |
cfbdbab0 AV |
1551 | __be32 *p; |
1552 | u32 verf_len; | |
3c15a486 | 1553 | |
5b304bc5 BF |
1554 | p = gsd->verf_start; |
1555 | gsd->verf_start = NULL; | |
1556 | ||
1557 | /* If the reply stat is nonzero, don't wrap: */ | |
1558 | if (*(p-1) != rpc_success) | |
1559 | return NULL; | |
1560 | /* Skip the verifier: */ | |
1561 | p += 1; | |
1562 | verf_len = ntohl(*p++); | |
1563 | p += XDR_QUADLEN(verf_len); | |
3c15a486 BF |
1564 | /* move accept_stat to right place: */ |
1565 | memcpy(p, p + 2, 4); | |
5b304bc5 | 1566 | /* Also don't wrap if the accept stat is nonzero: */ |
3c15a486 BF |
1567 | if (*p != rpc_success) { |
1568 | resbuf->head[0].iov_len -= 2 * 4; | |
1569 | return NULL; | |
1570 | } | |
1571 | p++; | |
1572 | return p; | |
1573 | } | |
1574 | ||
e142ede8 BF |
1575 | static inline int |
1576 | svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) | |
1da177e4 LT |
1577 | { |
1578 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1579 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1580 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1581 | struct xdr_buf integ_buf; | |
1582 | struct xdr_netobj mic; | |
1583 | struct kvec *resv; | |
d8ed029d | 1584 | __be32 *p; |
1da177e4 LT |
1585 | int integ_offset, integ_len; |
1586 | int stat = -EINVAL; | |
1587 | ||
3c15a486 BF |
1588 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
1589 | if (p == NULL) | |
e142ede8 | 1590 | goto out; |
e142ede8 BF |
1591 | integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; |
1592 | integ_len = resbuf->len - integ_offset; | |
1593 | BUG_ON(integ_len % 4); | |
1594 | *p++ = htonl(integ_len); | |
1595 | *p++ = htonl(gc->gc_seq); | |
bba0f88b | 1596 | if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) |
e142ede8 | 1597 | BUG(); |
153e44d2 | 1598 | if (resbuf->tail[0].iov_base == NULL) { |
e142ede8 BF |
1599 | if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) |
1600 | goto out_err; | |
1601 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base | |
1602 | + resbuf->head[0].iov_len; | |
1603 | resbuf->tail[0].iov_len = 0; | |
e142ede8 | 1604 | } |
bba0f88b | 1605 | resv = &resbuf->tail[0]; |
e142ede8 BF |
1606 | mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; |
1607 | if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) | |
1608 | goto out_err; | |
76994313 | 1609 | svc_putnl(resv, mic.len); |
e142ede8 BF |
1610 | memset(mic.data + mic.len, 0, |
1611 | round_up_to_quad(mic.len) - mic.len); | |
1612 | resv->iov_len += XDR_QUADLEN(mic.len) << 2; | |
1613 | /* not strictly required: */ | |
1614 | resbuf->len += XDR_QUADLEN(mic.len) << 2; | |
1615 | BUG_ON(resv->iov_len > PAGE_SIZE); | |
1616 | out: | |
1617 | stat = 0; | |
1618 | out_err: | |
1619 | return stat; | |
1620 | } | |
1621 | ||
7c9fdcfb BF |
1622 | static inline int |
1623 | svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) | |
1624 | { | |
1625 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1626 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1627 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1628 | struct page **inpages = NULL; | |
753ed90d AV |
1629 | __be32 *p, *len; |
1630 | int offset; | |
7c9fdcfb BF |
1631 | int pad; |
1632 | ||
3c15a486 BF |
1633 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
1634 | if (p == NULL) | |
7c9fdcfb | 1635 | return 0; |
7c9fdcfb BF |
1636 | len = p++; |
1637 | offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; | |
1638 | *p++ = htonl(gc->gc_seq); | |
1639 | inpages = resbuf->pages; | |
1640 | /* XXX: Would be better to write some xdr helper functions for | |
1641 | * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ | |
7561042f KC |
1642 | |
1643 | /* | |
1644 | * If there is currently tail data, make sure there is | |
1645 | * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in | |
1646 | * the page, and move the current tail data such that | |
1647 | * there is RPC_MAX_AUTH_SIZE slack space available in | |
1648 | * both the head and tail. | |
1649 | */ | |
44524359 | 1650 | if (resbuf->tail[0].iov_base) { |
7c9fdcfb BF |
1651 | BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base |
1652 | + PAGE_SIZE); | |
1653 | BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); | |
1654 | if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len | |
1655 | + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) | |
1656 | return -ENOMEM; | |
1657 | memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, | |
1658 | resbuf->tail[0].iov_base, | |
1659 | resbuf->tail[0].iov_len); | |
1660 | resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; | |
1661 | } | |
7561042f KC |
1662 | /* |
1663 | * If there is no current tail data, make sure there is | |
1664 | * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the | |
1665 | * allotted page, and set up tail information such that there | |
1666 | * is RPC_MAX_AUTH_SIZE slack space available in both the | |
1667 | * head and tail. | |
1668 | */ | |
7c9fdcfb BF |
1669 | if (resbuf->tail[0].iov_base == NULL) { |
1670 | if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) | |
1671 | return -ENOMEM; | |
1672 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base | |
1673 | + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; | |
1674 | resbuf->tail[0].iov_len = 0; | |
7c9fdcfb BF |
1675 | } |
1676 | if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) | |
1677 | return -ENOMEM; | |
1678 | *len = htonl(resbuf->len - offset); | |
1679 | pad = 3 - ((resbuf->len - offset - 1)&3); | |
d8ed029d | 1680 | p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); |
7c9fdcfb BF |
1681 | memset(p, 0, pad); |
1682 | resbuf->tail[0].iov_len += pad; | |
1683 | resbuf->len += pad; | |
1684 | return 0; | |
1685 | } | |
1686 | ||
e142ede8 BF |
1687 | static int |
1688 | svcauth_gss_release(struct svc_rqst *rqstp) | |
1689 | { | |
1690 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; | |
1691 | struct rpc_gss_wire_cred *gc = &gsd->clcred; | |
1692 | struct xdr_buf *resbuf = &rqstp->rq_res; | |
1693 | int stat = -EINVAL; | |
a1db410d | 1694 | struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); |
e142ede8 | 1695 | |
1da177e4 LT |
1696 | if (gc->gc_proc != RPC_GSS_PROC_DATA) |
1697 | goto out; | |
1698 | /* Release can be called twice, but we only wrap once. */ | |
5b304bc5 | 1699 | if (gsd->verf_start == NULL) |
1da177e4 LT |
1700 | goto out; |
1701 | /* normally not set till svc_send, but we need it here: */ | |
7c9fdcfb BF |
1702 | /* XXX: what for? Do we mess it up the moment we call svc_putu32 |
1703 | * or whatever? */ | |
1704 | resbuf->len = total_buf_len(resbuf); | |
1da177e4 LT |
1705 | switch (gc->gc_svc) { |
1706 | case RPC_GSS_SVC_NONE: | |
1707 | break; | |
1708 | case RPC_GSS_SVC_INTEGRITY: | |
7c9fdcfb BF |
1709 | stat = svcauth_gss_wrap_resp_integ(rqstp); |
1710 | if (stat) | |
1711 | goto out_err; | |
1da177e4 LT |
1712 | break; |
1713 | case RPC_GSS_SVC_PRIVACY: | |
7c9fdcfb BF |
1714 | stat = svcauth_gss_wrap_resp_priv(rqstp); |
1715 | if (stat) | |
1716 | goto out_err; | |
1717 | break; | |
eac81736 WY |
1718 | /* |
1719 | * For any other gc_svc value, svcauth_gss_accept() already set | |
1720 | * the auth_error appropriately; just fall through: | |
1721 | */ | |
1da177e4 LT |
1722 | } |
1723 | ||
1724 | out: | |
1725 | stat = 0; | |
1726 | out_err: | |
1727 | if (rqstp->rq_client) | |
1728 | auth_domain_put(rqstp->rq_client); | |
1729 | rqstp->rq_client = NULL; | |
3ab4d8b1 BF |
1730 | if (rqstp->rq_gssclient) |
1731 | auth_domain_put(rqstp->rq_gssclient); | |
1732 | rqstp->rq_gssclient = NULL; | |
1da177e4 LT |
1733 | if (rqstp->rq_cred.cr_group_info) |
1734 | put_group_info(rqstp->rq_cred.cr_group_info); | |
1735 | rqstp->rq_cred.cr_group_info = NULL; | |
1736 | if (gsd->rsci) | |
a1db410d | 1737 | cache_put(&gsd->rsci->h, sn->rsc_cache); |
1da177e4 LT |
1738 | gsd->rsci = NULL; |
1739 | ||
1740 | return stat; | |
1741 | } | |
1742 | ||
1743 | static void | |
1744 | svcauth_gss_domain_release(struct auth_domain *dom) | |
1745 | { | |
1746 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); | |
1747 | ||
1748 | kfree(dom->name); | |
1749 | kfree(gd); | |
1750 | } | |
1751 | ||
1752 | static struct auth_ops svcauthops_gss = { | |
1753 | .name = "rpcsec_gss", | |
1754 | .owner = THIS_MODULE, | |
1755 | .flavour = RPC_AUTH_GSS, | |
1756 | .accept = svcauth_gss_accept, | |
1757 | .release = svcauth_gss_release, | |
1758 | .domain_release = svcauth_gss_domain_release, | |
1759 | .set_client = svcauth_gss_set_client, | |
1760 | }; | |
1761 | ||
a1db410d SK |
1762 | static int rsi_cache_create_net(struct net *net) |
1763 | { | |
1764 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1765 | struct cache_detail *cd; | |
1766 | int err; | |
1767 | ||
1768 | cd = cache_create_net(&rsi_cache_template, net); | |
1769 | if (IS_ERR(cd)) | |
1770 | return PTR_ERR(cd); | |
1771 | err = cache_register_net(cd, net); | |
1772 | if (err) { | |
1773 | cache_destroy_net(cd, net); | |
1774 | return err; | |
1775 | } | |
1776 | sn->rsi_cache = cd; | |
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | static void rsi_cache_destroy_net(struct net *net) | |
1781 | { | |
1782 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1783 | struct cache_detail *cd = sn->rsi_cache; | |
1784 | ||
1785 | sn->rsi_cache = NULL; | |
1786 | cache_purge(cd); | |
1787 | cache_unregister_net(cd, net); | |
1788 | cache_destroy_net(cd, net); | |
1789 | } | |
1790 | ||
1791 | static int rsc_cache_create_net(struct net *net) | |
1792 | { | |
1793 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1794 | struct cache_detail *cd; | |
1795 | int err; | |
1796 | ||
1797 | cd = cache_create_net(&rsc_cache_template, net); | |
1798 | if (IS_ERR(cd)) | |
1799 | return PTR_ERR(cd); | |
1800 | err = cache_register_net(cd, net); | |
1801 | if (err) { | |
1802 | cache_destroy_net(cd, net); | |
1803 | return err; | |
1804 | } | |
1805 | sn->rsc_cache = cd; | |
1806 | return 0; | |
1807 | } | |
1808 | ||
1809 | static void rsc_cache_destroy_net(struct net *net) | |
1810 | { | |
1811 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1812 | struct cache_detail *cd = sn->rsc_cache; | |
1813 | ||
1814 | sn->rsc_cache = NULL; | |
1815 | cache_purge(cd); | |
1816 | cache_unregister_net(cd, net); | |
1817 | cache_destroy_net(cd, net); | |
1818 | } | |
1819 | ||
1da177e4 | 1820 | int |
a1db410d | 1821 | gss_svc_init_net(struct net *net) |
1da177e4 | 1822 | { |
a1db410d SK |
1823 | int rv; |
1824 | ||
1825 | rv = rsc_cache_create_net(net); | |
dbf847ec BF |
1826 | if (rv) |
1827 | return rv; | |
a1db410d | 1828 | rv = rsi_cache_create_net(net); |
dbf847ec BF |
1829 | if (rv) |
1830 | goto out1; | |
030d794b SS |
1831 | rv = create_use_gss_proxy_proc_entry(net); |
1832 | if (rv) | |
1833 | goto out2; | |
dbf847ec | 1834 | return 0; |
030d794b SS |
1835 | out2: |
1836 | destroy_use_gss_proxy_proc_entry(net); | |
dbf847ec | 1837 | out1: |
a1db410d | 1838 | rsc_cache_destroy_net(net); |
1da177e4 LT |
1839 | return rv; |
1840 | } | |
1841 | ||
a1db410d SK |
1842 | void |
1843 | gss_svc_shutdown_net(struct net *net) | |
1844 | { | |
030d794b | 1845 | destroy_use_gss_proxy_proc_entry(net); |
a1db410d SK |
1846 | rsi_cache_destroy_net(net); |
1847 | rsc_cache_destroy_net(net); | |
1848 | } | |
1849 | ||
1850 | int | |
1851 | gss_svc_init(void) | |
1852 | { | |
1853 | return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); | |
1854 | } | |
1855 | ||
1da177e4 LT |
1856 | void |
1857 | gss_svc_shutdown(void) | |
1858 | { | |
1da177e4 LT |
1859 | svc_auth_unregister(RPC_AUTH_GSS); |
1860 | } |