| 1 | /* |
| 2 | * Modifications for Lustre |
| 3 | * |
| 4 | * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. |
| 5 | * |
| 6 | * Copyright (c) 2011, 2012, Intel Corporation. |
| 7 | * |
| 8 | * Author: Eric Mei <ericm@clusterfs.com> |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * Neil Brown <neilb@cse.unsw.edu.au> |
| 13 | * J. Bruce Fields <bfields@umich.edu> |
| 14 | * Andy Adamson <andros@umich.edu> |
| 15 | * Dug Song <dugsong@monkey.org> |
| 16 | * |
| 17 | * RPCSEC_GSS server authentication. |
| 18 | * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 |
| 19 | * (gssapi) |
| 20 | * |
| 21 | * The RPCSEC_GSS involves three stages: |
| 22 | * 1/ context creation |
| 23 | * 2/ data exchange |
| 24 | * 3/ context destruction |
| 25 | * |
| 26 | * Context creation is handled largely by upcalls to user-space. |
| 27 | * In particular, GSS_Accept_sec_context is handled by an upcall |
| 28 | * Data exchange is handled entirely within the kernel |
| 29 | * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. |
| 30 | * Context destruction is handled in-kernel |
| 31 | * GSS_Delete_sec_context is in-kernel |
| 32 | * |
| 33 | * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. |
| 34 | * The context handle and gss_token are used as a key into the rpcsec_init cache. |
| 35 | * The content of this cache includes some of the outputs of GSS_Accept_sec_context, |
| 36 | * being major_status, minor_status, context_handle, reply_token. |
| 37 | * These are sent back to the client. |
| 38 | * Sequence window management is handled by the kernel. The window size if currently |
| 39 | * a compile time constant. |
| 40 | * |
| 41 | * When user-space is happy that a context is established, it places an entry |
| 42 | * in the rpcsec_context cache. The key for this cache is the context_handle. |
| 43 | * The content includes: |
| 44 | * uid/gidlist - for determining access rights |
| 45 | * mechanism type |
| 46 | * mechanism specific information, such as a key |
| 47 | * |
| 48 | */ |
| 49 | |
| 50 | #define DEBUG_SUBSYSTEM S_SEC |
| 51 | #include <linux/types.h> |
| 52 | #include <linux/init.h> |
| 53 | #include <linux/module.h> |
| 54 | #include <linux/slab.h> |
| 55 | #include <linux/hash.h> |
| 56 | #include <linux/mutex.h> |
| 57 | #include <linux/sunrpc/cache.h> |
| 58 | |
| 59 | #include <obd.h> |
| 60 | #include <obd_class.h> |
| 61 | #include <obd_support.h> |
| 62 | #include <lustre/lustre_idl.h> |
| 63 | #include <lustre_net.h> |
| 64 | #include <lustre_import.h> |
| 65 | #include <lustre_sec.h> |
| 66 | |
| 67 | #include "gss_err.h" |
| 68 | #include "gss_internal.h" |
| 69 | #include "gss_api.h" |
| 70 | |
| 71 | #define GSS_SVC_UPCALL_TIMEOUT (20) |
| 72 | |
| 73 | static spinlock_t __ctx_index_lock; |
| 74 | static __u64 __ctx_index; |
| 75 | |
| 76 | __u64 gss_get_next_ctx_index(void) |
| 77 | { |
| 78 | __u64 idx; |
| 79 | |
| 80 | spin_lock(&__ctx_index_lock); |
| 81 | idx = __ctx_index++; |
| 82 | spin_unlock(&__ctx_index_lock); |
| 83 | |
| 84 | return idx; |
| 85 | } |
| 86 | |
| 87 | static inline unsigned long hash_mem(char *buf, int length, int bits) |
| 88 | { |
| 89 | unsigned long hash = 0; |
| 90 | unsigned long l = 0; |
| 91 | int len = 0; |
| 92 | unsigned char c; |
| 93 | |
| 94 | do { |
| 95 | if (len == length) { |
| 96 | c = (char) len; |
| 97 | len = -1; |
| 98 | } else |
| 99 | c = *buf++; |
| 100 | |
| 101 | l = (l << 8) | c; |
| 102 | len++; |
| 103 | |
| 104 | if ((len & (BITS_PER_LONG/8-1)) == 0) |
| 105 | hash = cfs_hash_long(hash^l, BITS_PER_LONG); |
| 106 | } while (len); |
| 107 | |
| 108 | return hash >> (BITS_PER_LONG - bits); |
| 109 | } |
| 110 | |
| 111 | /**************************************** |
| 112 | * rsi cache * |
| 113 | ****************************************/ |
| 114 | |
| 115 | #define RSI_HASHBITS (6) |
| 116 | #define RSI_HASHMAX (1 << RSI_HASHBITS) |
| 117 | #define RSI_HASHMASK (RSI_HASHMAX - 1) |
| 118 | |
| 119 | struct rsi { |
| 120 | struct cache_head h; |
| 121 | __u32 lustre_svc; |
| 122 | __u64 nid; |
| 123 | wait_queue_head_t waitq; |
| 124 | rawobj_t in_handle, in_token; |
| 125 | rawobj_t out_handle, out_token; |
| 126 | int major_status, minor_status; |
| 127 | }; |
| 128 | |
| 129 | static struct cache_head *rsi_table[RSI_HASHMAX]; |
| 130 | static struct cache_detail rsi_cache; |
| 131 | static struct rsi *rsi_update(struct rsi *new, struct rsi *old); |
| 132 | static struct rsi *rsi_lookup(struct rsi *item); |
| 133 | |
| 134 | static inline int rsi_hash(struct rsi *item) |
| 135 | { |
| 136 | return hash_mem((char *)item->in_handle.data, item->in_handle.len, |
| 137 | RSI_HASHBITS) ^ |
| 138 | hash_mem((char *)item->in_token.data, item->in_token.len, |
| 139 | RSI_HASHBITS); |
| 140 | } |
| 141 | |
| 142 | static inline int __rsi_match(struct rsi *item, struct rsi *tmp) |
| 143 | { |
| 144 | return (rawobj_equal(&item->in_handle, &tmp->in_handle) && |
| 145 | rawobj_equal(&item->in_token, &tmp->in_token)); |
| 146 | } |
| 147 | |
| 148 | static void rsi_free(struct rsi *rsi) |
| 149 | { |
| 150 | rawobj_free(&rsi->in_handle); |
| 151 | rawobj_free(&rsi->in_token); |
| 152 | rawobj_free(&rsi->out_handle); |
| 153 | rawobj_free(&rsi->out_token); |
| 154 | } |
| 155 | |
| 156 | static void rsi_request(struct cache_detail *cd, |
| 157 | struct cache_head *h, |
| 158 | char **bpp, int *blen) |
| 159 | { |
| 160 | struct rsi *rsi = container_of(h, struct rsi, h); |
| 161 | __u64 index = 0; |
| 162 | |
| 163 | /* if in_handle is null, provide kernel suggestion */ |
| 164 | if (rsi->in_handle.len == 0) |
| 165 | index = gss_get_next_ctx_index(); |
| 166 | |
| 167 | qword_addhex(bpp, blen, (char *) &rsi->lustre_svc, |
| 168 | sizeof(rsi->lustre_svc)); |
| 169 | qword_addhex(bpp, blen, (char *) &rsi->nid, sizeof(rsi->nid)); |
| 170 | qword_addhex(bpp, blen, (char *) &index, sizeof(index)); |
| 171 | qword_addhex(bpp, blen, rsi->in_handle.data, rsi->in_handle.len); |
| 172 | qword_addhex(bpp, blen, rsi->in_token.data, rsi->in_token.len); |
| 173 | (*bpp)[-1] = '\n'; |
| 174 | } |
| 175 | |
| 176 | static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) |
| 177 | { |
| 178 | return sunrpc_cache_pipe_upcall(cd, h, rsi_request); |
| 179 | } |
| 180 | |
| 181 | static inline void __rsi_init(struct rsi *new, struct rsi *item) |
| 182 | { |
| 183 | new->out_handle = RAWOBJ_EMPTY; |
| 184 | new->out_token = RAWOBJ_EMPTY; |
| 185 | |
| 186 | new->in_handle = item->in_handle; |
| 187 | item->in_handle = RAWOBJ_EMPTY; |
| 188 | new->in_token = item->in_token; |
| 189 | item->in_token = RAWOBJ_EMPTY; |
| 190 | |
| 191 | new->lustre_svc = item->lustre_svc; |
| 192 | new->nid = item->nid; |
| 193 | init_waitqueue_head(&new->waitq); |
| 194 | } |
| 195 | |
| 196 | static inline void __rsi_update(struct rsi *new, struct rsi *item) |
| 197 | { |
| 198 | LASSERT(new->out_handle.len == 0); |
| 199 | LASSERT(new->out_token.len == 0); |
| 200 | |
| 201 | new->out_handle = item->out_handle; |
| 202 | item->out_handle = RAWOBJ_EMPTY; |
| 203 | new->out_token = item->out_token; |
| 204 | item->out_token = RAWOBJ_EMPTY; |
| 205 | |
| 206 | new->major_status = item->major_status; |
| 207 | new->minor_status = item->minor_status; |
| 208 | } |
| 209 | |
| 210 | static void rsi_put(struct kref *ref) |
| 211 | { |
| 212 | struct rsi *rsi = container_of(ref, struct rsi, h.ref); |
| 213 | |
| 214 | LASSERT(rsi->h.next == NULL); |
| 215 | rsi_free(rsi); |
| 216 | OBD_FREE_PTR(rsi); |
| 217 | } |
| 218 | |
| 219 | static int rsi_match(struct cache_head *a, struct cache_head *b) |
| 220 | { |
| 221 | struct rsi *item = container_of(a, struct rsi, h); |
| 222 | struct rsi *tmp = container_of(b, struct rsi, h); |
| 223 | |
| 224 | return __rsi_match(item, tmp); |
| 225 | } |
| 226 | |
| 227 | static void rsi_init(struct cache_head *cnew, struct cache_head *citem) |
| 228 | { |
| 229 | struct rsi *new = container_of(cnew, struct rsi, h); |
| 230 | struct rsi *item = container_of(citem, struct rsi, h); |
| 231 | |
| 232 | __rsi_init(new, item); |
| 233 | } |
| 234 | |
| 235 | static void update_rsi(struct cache_head *cnew, struct cache_head *citem) |
| 236 | { |
| 237 | struct rsi *new = container_of(cnew, struct rsi, h); |
| 238 | struct rsi *item = container_of(citem, struct rsi, h); |
| 239 | |
| 240 | __rsi_update(new, item); |
| 241 | } |
| 242 | |
| 243 | static struct cache_head *rsi_alloc(void) |
| 244 | { |
| 245 | struct rsi *rsi; |
| 246 | |
| 247 | OBD_ALLOC_PTR(rsi); |
| 248 | if (rsi) |
| 249 | return &rsi->h; |
| 250 | else |
| 251 | return NULL; |
| 252 | } |
| 253 | |
| 254 | static int rsi_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 255 | { |
| 256 | char *buf = mesg; |
| 257 | char *ep; |
| 258 | int len; |
| 259 | struct rsi rsii, *rsip = NULL; |
| 260 | time_t expiry; |
| 261 | int status = -EINVAL; |
| 262 | |
| 263 | memset(&rsii, 0, sizeof(rsii)); |
| 264 | |
| 265 | /* handle */ |
| 266 | len = qword_get(&mesg, buf, mlen); |
| 267 | if (len < 0) |
| 268 | goto out; |
| 269 | if (rawobj_alloc(&rsii.in_handle, buf, len)) { |
| 270 | status = -ENOMEM; |
| 271 | goto out; |
| 272 | } |
| 273 | |
| 274 | /* token */ |
| 275 | len = qword_get(&mesg, buf, mlen); |
| 276 | if (len < 0) |
| 277 | goto out; |
| 278 | if (rawobj_alloc(&rsii.in_token, buf, len)) { |
| 279 | status = -ENOMEM; |
| 280 | goto out; |
| 281 | } |
| 282 | |
| 283 | rsip = rsi_lookup(&rsii); |
| 284 | if (!rsip) |
| 285 | goto out; |
| 286 | |
| 287 | rsii.h.flags = 0; |
| 288 | /* expiry */ |
| 289 | expiry = get_expiry(&mesg); |
| 290 | if (expiry == 0) |
| 291 | goto out; |
| 292 | |
| 293 | len = qword_get(&mesg, buf, mlen); |
| 294 | if (len <= 0) |
| 295 | goto out; |
| 296 | |
| 297 | /* major */ |
| 298 | rsii.major_status = simple_strtol(buf, &ep, 10); |
| 299 | if (*ep) |
| 300 | goto out; |
| 301 | |
| 302 | /* minor */ |
| 303 | len = qword_get(&mesg, buf, mlen); |
| 304 | if (len <= 0) |
| 305 | goto out; |
| 306 | rsii.minor_status = simple_strtol(buf, &ep, 10); |
| 307 | if (*ep) |
| 308 | goto out; |
| 309 | |
| 310 | /* out_handle */ |
| 311 | len = qword_get(&mesg, buf, mlen); |
| 312 | if (len < 0) |
| 313 | goto out; |
| 314 | if (rawobj_alloc(&rsii.out_handle, buf, len)) { |
| 315 | status = -ENOMEM; |
| 316 | goto out; |
| 317 | } |
| 318 | |
| 319 | /* out_token */ |
| 320 | len = qword_get(&mesg, buf, mlen); |
| 321 | if (len < 0) |
| 322 | goto out; |
| 323 | if (rawobj_alloc(&rsii.out_token, buf, len)) { |
| 324 | status = -ENOMEM; |
| 325 | goto out; |
| 326 | } |
| 327 | |
| 328 | rsii.h.expiry_time = expiry; |
| 329 | rsip = rsi_update(&rsii, rsip); |
| 330 | status = 0; |
| 331 | out: |
| 332 | rsi_free(&rsii); |
| 333 | if (rsip) { |
| 334 | wake_up_all(&rsip->waitq); |
| 335 | cache_put(&rsip->h, &rsi_cache); |
| 336 | } else { |
| 337 | status = -ENOMEM; |
| 338 | } |
| 339 | |
| 340 | if (status) |
| 341 | CERROR("rsi parse error %d\n", status); |
| 342 | return status; |
| 343 | } |
| 344 | |
| 345 | static struct cache_detail rsi_cache = { |
| 346 | .hash_size = RSI_HASHMAX, |
| 347 | .hash_table = rsi_table, |
| 348 | .name = "auth.sptlrpc.init", |
| 349 | .cache_put = rsi_put, |
| 350 | .cache_upcall = rsi_upcall, |
| 351 | .cache_parse = rsi_parse, |
| 352 | .match = rsi_match, |
| 353 | .init = rsi_init, |
| 354 | .update = update_rsi, |
| 355 | .alloc = rsi_alloc, |
| 356 | }; |
| 357 | |
| 358 | static struct rsi *rsi_lookup(struct rsi *item) |
| 359 | { |
| 360 | struct cache_head *ch; |
| 361 | int hash = rsi_hash(item); |
| 362 | |
| 363 | ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); |
| 364 | if (ch) |
| 365 | return container_of(ch, struct rsi, h); |
| 366 | else |
| 367 | return NULL; |
| 368 | } |
| 369 | |
| 370 | static struct rsi *rsi_update(struct rsi *new, struct rsi *old) |
| 371 | { |
| 372 | struct cache_head *ch; |
| 373 | int hash = rsi_hash(new); |
| 374 | |
| 375 | ch = sunrpc_cache_update(&rsi_cache, &new->h, &old->h, hash); |
| 376 | if (ch) |
| 377 | return container_of(ch, struct rsi, h); |
| 378 | else |
| 379 | return NULL; |
| 380 | } |
| 381 | |
| 382 | /**************************************** |
| 383 | * rsc cache * |
| 384 | ****************************************/ |
| 385 | |
| 386 | #define RSC_HASHBITS (10) |
| 387 | #define RSC_HASHMAX (1 << RSC_HASHBITS) |
| 388 | #define RSC_HASHMASK (RSC_HASHMAX - 1) |
| 389 | |
| 390 | struct rsc { |
| 391 | struct cache_head h; |
| 392 | struct obd_device *target; |
| 393 | rawobj_t handle; |
| 394 | struct gss_svc_ctx ctx; |
| 395 | }; |
| 396 | |
| 397 | static struct cache_head *rsc_table[RSC_HASHMAX]; |
| 398 | static struct cache_detail rsc_cache; |
| 399 | static struct rsc *rsc_update(struct rsc *new, struct rsc *old); |
| 400 | static struct rsc *rsc_lookup(struct rsc *item); |
| 401 | |
| 402 | static void rsc_free(struct rsc *rsci) |
| 403 | { |
| 404 | rawobj_free(&rsci->handle); |
| 405 | rawobj_free(&rsci->ctx.gsc_rvs_hdl); |
| 406 | lgss_delete_sec_context(&rsci->ctx.gsc_mechctx); |
| 407 | } |
| 408 | |
| 409 | static inline int rsc_hash(struct rsc *rsci) |
| 410 | { |
| 411 | return hash_mem((char *)rsci->handle.data, |
| 412 | rsci->handle.len, RSC_HASHBITS); |
| 413 | } |
| 414 | |
| 415 | static inline int __rsc_match(struct rsc *new, struct rsc *tmp) |
| 416 | { |
| 417 | return rawobj_equal(&new->handle, &tmp->handle); |
| 418 | } |
| 419 | |
| 420 | static inline void __rsc_init(struct rsc *new, struct rsc *tmp) |
| 421 | { |
| 422 | new->handle = tmp->handle; |
| 423 | tmp->handle = RAWOBJ_EMPTY; |
| 424 | |
| 425 | new->target = NULL; |
| 426 | memset(&new->ctx, 0, sizeof(new->ctx)); |
| 427 | new->ctx.gsc_rvs_hdl = RAWOBJ_EMPTY; |
| 428 | } |
| 429 | |
| 430 | static inline void __rsc_update(struct rsc *new, struct rsc *tmp) |
| 431 | { |
| 432 | new->ctx = tmp->ctx; |
| 433 | tmp->ctx.gsc_rvs_hdl = RAWOBJ_EMPTY; |
| 434 | tmp->ctx.gsc_mechctx = NULL; |
| 435 | |
| 436 | memset(&new->ctx.gsc_seqdata, 0, sizeof(new->ctx.gsc_seqdata)); |
| 437 | spin_lock_init(&new->ctx.gsc_seqdata.ssd_lock); |
| 438 | } |
| 439 | |
| 440 | static void rsc_put(struct kref *ref) |
| 441 | { |
| 442 | struct rsc *rsci = container_of(ref, struct rsc, h.ref); |
| 443 | |
| 444 | LASSERT(rsci->h.next == NULL); |
| 445 | rsc_free(rsci); |
| 446 | OBD_FREE_PTR(rsci); |
| 447 | } |
| 448 | |
| 449 | static int rsc_match(struct cache_head *a, struct cache_head *b) |
| 450 | { |
| 451 | struct rsc *new = container_of(a, struct rsc, h); |
| 452 | struct rsc *tmp = container_of(b, struct rsc, h); |
| 453 | |
| 454 | return __rsc_match(new, tmp); |
| 455 | } |
| 456 | |
| 457 | static void rsc_init(struct cache_head *cnew, struct cache_head *ctmp) |
| 458 | { |
| 459 | struct rsc *new = container_of(cnew, struct rsc, h); |
| 460 | struct rsc *tmp = container_of(ctmp, struct rsc, h); |
| 461 | |
| 462 | __rsc_init(new, tmp); |
| 463 | } |
| 464 | |
| 465 | static void update_rsc(struct cache_head *cnew, struct cache_head *ctmp) |
| 466 | { |
| 467 | struct rsc *new = container_of(cnew, struct rsc, h); |
| 468 | struct rsc *tmp = container_of(ctmp, struct rsc, h); |
| 469 | |
| 470 | __rsc_update(new, tmp); |
| 471 | } |
| 472 | |
| 473 | static struct cache_head * rsc_alloc(void) |
| 474 | { |
| 475 | struct rsc *rsc; |
| 476 | |
| 477 | OBD_ALLOC_PTR(rsc); |
| 478 | if (rsc) |
| 479 | return &rsc->h; |
| 480 | else |
| 481 | return NULL; |
| 482 | } |
| 483 | |
| 484 | static int rsc_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 485 | { |
| 486 | char *buf = mesg; |
| 487 | int len, rv, tmp_int; |
| 488 | struct rsc rsci, *rscp = NULL; |
| 489 | time_t expiry; |
| 490 | int status = -EINVAL; |
| 491 | struct gss_api_mech *gm = NULL; |
| 492 | |
| 493 | memset(&rsci, 0, sizeof(rsci)); |
| 494 | |
| 495 | /* context handle */ |
| 496 | len = qword_get(&mesg, buf, mlen); |
| 497 | if (len < 0) goto out; |
| 498 | status = -ENOMEM; |
| 499 | if (rawobj_alloc(&rsci.handle, buf, len)) |
| 500 | goto out; |
| 501 | |
| 502 | rsci.h.flags = 0; |
| 503 | /* expiry */ |
| 504 | expiry = get_expiry(&mesg); |
| 505 | status = -EINVAL; |
| 506 | if (expiry == 0) |
| 507 | goto out; |
| 508 | |
| 509 | /* remote flag */ |
| 510 | rv = get_int(&mesg, &tmp_int); |
| 511 | if (rv) { |
| 512 | CERROR("fail to get remote flag\n"); |
| 513 | goto out; |
| 514 | } |
| 515 | rsci.ctx.gsc_remote = (tmp_int != 0); |
| 516 | |
| 517 | /* root user flag */ |
| 518 | rv = get_int(&mesg, &tmp_int); |
| 519 | if (rv) { |
| 520 | CERROR("fail to get oss user flag\n"); |
| 521 | goto out; |
| 522 | } |
| 523 | rsci.ctx.gsc_usr_root = (tmp_int != 0); |
| 524 | |
| 525 | /* mds user flag */ |
| 526 | rv = get_int(&mesg, &tmp_int); |
| 527 | if (rv) { |
| 528 | CERROR("fail to get mds user flag\n"); |
| 529 | goto out; |
| 530 | } |
| 531 | rsci.ctx.gsc_usr_mds = (tmp_int != 0); |
| 532 | |
| 533 | /* oss user flag */ |
| 534 | rv = get_int(&mesg, &tmp_int); |
| 535 | if (rv) { |
| 536 | CERROR("fail to get oss user flag\n"); |
| 537 | goto out; |
| 538 | } |
| 539 | rsci.ctx.gsc_usr_oss = (tmp_int != 0); |
| 540 | |
| 541 | /* mapped uid */ |
| 542 | rv = get_int(&mesg, (int *) &rsci.ctx.gsc_mapped_uid); |
| 543 | if (rv) { |
| 544 | CERROR("fail to get mapped uid\n"); |
| 545 | goto out; |
| 546 | } |
| 547 | |
| 548 | rscp = rsc_lookup(&rsci); |
| 549 | if (!rscp) |
| 550 | goto out; |
| 551 | |
| 552 | /* uid, or NEGATIVE */ |
| 553 | rv = get_int(&mesg, (int *) &rsci.ctx.gsc_uid); |
| 554 | if (rv == -EINVAL) |
| 555 | goto out; |
| 556 | if (rv == -ENOENT) { |
| 557 | CERROR("NOENT? set rsc entry negative\n"); |
| 558 | set_bit(CACHE_NEGATIVE, &rsci.h.flags); |
| 559 | } else { |
| 560 | rawobj_t tmp_buf; |
| 561 | unsigned long ctx_expiry; |
| 562 | |
| 563 | /* gid */ |
| 564 | if (get_int(&mesg, (int *) &rsci.ctx.gsc_gid)) |
| 565 | goto out; |
| 566 | |
| 567 | /* mech name */ |
| 568 | len = qword_get(&mesg, buf, mlen); |
| 569 | if (len < 0) |
| 570 | goto out; |
| 571 | gm = lgss_name_to_mech(buf); |
| 572 | status = -EOPNOTSUPP; |
| 573 | if (!gm) |
| 574 | goto out; |
| 575 | |
| 576 | status = -EINVAL; |
| 577 | /* mech-specific data: */ |
| 578 | len = qword_get(&mesg, buf, mlen); |
| 579 | if (len < 0) |
| 580 | goto out; |
| 581 | |
| 582 | tmp_buf.len = len; |
| 583 | tmp_buf.data = (unsigned char *)buf; |
| 584 | if (lgss_import_sec_context(&tmp_buf, gm, |
| 585 | &rsci.ctx.gsc_mechctx)) |
| 586 | goto out; |
| 587 | |
| 588 | /* currently the expiry time passed down from user-space |
| 589 | * is invalid, here we retrive it from mech. */ |
| 590 | if (lgss_inquire_context(rsci.ctx.gsc_mechctx, &ctx_expiry)) { |
| 591 | CERROR("unable to get expire time, drop it\n"); |
| 592 | goto out; |
| 593 | } |
| 594 | expiry = (time_t) ctx_expiry; |
| 595 | } |
| 596 | |
| 597 | rsci.h.expiry_time = expiry; |
| 598 | rscp = rsc_update(&rsci, rscp); |
| 599 | status = 0; |
| 600 | out: |
| 601 | if (gm) |
| 602 | lgss_mech_put(gm); |
| 603 | rsc_free(&rsci); |
| 604 | if (rscp) |
| 605 | cache_put(&rscp->h, &rsc_cache); |
| 606 | else |
| 607 | status = -ENOMEM; |
| 608 | |
| 609 | if (status) |
| 610 | CERROR("parse rsc error %d\n", status); |
| 611 | return status; |
| 612 | } |
| 613 | |
| 614 | static struct cache_detail rsc_cache = { |
| 615 | .hash_size = RSC_HASHMAX, |
| 616 | .hash_table = rsc_table, |
| 617 | .name = "auth.sptlrpc.context", |
| 618 | .cache_put = rsc_put, |
| 619 | .cache_parse = rsc_parse, |
| 620 | .match = rsc_match, |
| 621 | .init = rsc_init, |
| 622 | .update = update_rsc, |
| 623 | .alloc = rsc_alloc, |
| 624 | }; |
| 625 | |
| 626 | static struct rsc *rsc_lookup(struct rsc *item) |
| 627 | { |
| 628 | struct cache_head *ch; |
| 629 | int hash = rsc_hash(item); |
| 630 | |
| 631 | ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); |
| 632 | if (ch) |
| 633 | return container_of(ch, struct rsc, h); |
| 634 | else |
| 635 | return NULL; |
| 636 | } |
| 637 | |
| 638 | static struct rsc *rsc_update(struct rsc *new, struct rsc *old) |
| 639 | { |
| 640 | struct cache_head *ch; |
| 641 | int hash = rsc_hash(new); |
| 642 | |
| 643 | ch = sunrpc_cache_update(&rsc_cache, &new->h, &old->h, hash); |
| 644 | if (ch) |
| 645 | return container_of(ch, struct rsc, h); |
| 646 | else |
| 647 | return NULL; |
| 648 | } |
| 649 | |
| 650 | #define COMPAT_RSC_PUT(item, cd) cache_put((item), (cd)) |
| 651 | |
| 652 | /**************************************** |
| 653 | * rsc cache flush * |
| 654 | ****************************************/ |
| 655 | |
| 656 | typedef int rsc_entry_match(struct rsc *rscp, long data); |
| 657 | |
| 658 | static void rsc_flush(rsc_entry_match *match, long data) |
| 659 | { |
| 660 | struct cache_head **ch; |
| 661 | struct rsc *rscp; |
| 662 | int n; |
| 663 | |
| 664 | write_lock(&rsc_cache.hash_lock); |
| 665 | for (n = 0; n < RSC_HASHMAX; n++) { |
| 666 | for (ch = &rsc_cache.hash_table[n]; *ch;) { |
| 667 | rscp = container_of(*ch, struct rsc, h); |
| 668 | |
| 669 | if (!match(rscp, data)) { |
| 670 | ch = &((*ch)->next); |
| 671 | continue; |
| 672 | } |
| 673 | |
| 674 | /* it seems simply set NEGATIVE doesn't work */ |
| 675 | *ch = (*ch)->next; |
| 676 | rscp->h.next = NULL; |
| 677 | cache_get(&rscp->h); |
| 678 | set_bit(CACHE_NEGATIVE, &rscp->h.flags); |
| 679 | COMPAT_RSC_PUT(&rscp->h, &rsc_cache); |
| 680 | rsc_cache.entries--; |
| 681 | } |
| 682 | } |
| 683 | write_unlock(&rsc_cache.hash_lock); |
| 684 | } |
| 685 | |
| 686 | static int match_uid(struct rsc *rscp, long uid) |
| 687 | { |
| 688 | if ((int) uid == -1) |
| 689 | return 1; |
| 690 | return ((int) rscp->ctx.gsc_uid == (int) uid); |
| 691 | } |
| 692 | |
| 693 | static int match_target(struct rsc *rscp, long target) |
| 694 | { |
| 695 | return (rscp->target == (struct obd_device *) target); |
| 696 | } |
| 697 | |
| 698 | static inline void rsc_flush_uid(int uid) |
| 699 | { |
| 700 | if (uid == -1) |
| 701 | CWARN("flush all gss contexts...\n"); |
| 702 | |
| 703 | rsc_flush(match_uid, (long) uid); |
| 704 | } |
| 705 | |
| 706 | static inline void rsc_flush_target(struct obd_device *target) |
| 707 | { |
| 708 | rsc_flush(match_target, (long) target); |
| 709 | } |
| 710 | |
| 711 | void gss_secsvc_flush(struct obd_device *target) |
| 712 | { |
| 713 | rsc_flush_target(target); |
| 714 | } |
| 715 | EXPORT_SYMBOL(gss_secsvc_flush); |
| 716 | |
| 717 | static struct rsc *gss_svc_searchbyctx(rawobj_t *handle) |
| 718 | { |
| 719 | struct rsc rsci; |
| 720 | struct rsc *found; |
| 721 | |
| 722 | memset(&rsci, 0, sizeof(rsci)); |
| 723 | if (rawobj_dup(&rsci.handle, handle)) |
| 724 | return NULL; |
| 725 | |
| 726 | found = rsc_lookup(&rsci); |
| 727 | rsc_free(&rsci); |
| 728 | if (!found) |
| 729 | return NULL; |
| 730 | if (cache_check(&rsc_cache, &found->h, NULL)) |
| 731 | return NULL; |
| 732 | return found; |
| 733 | } |
| 734 | |
| 735 | int gss_svc_upcall_install_rvs_ctx(struct obd_import *imp, |
| 736 | struct gss_sec *gsec, |
| 737 | struct gss_cli_ctx *gctx) |
| 738 | { |
| 739 | struct rsc rsci, *rscp = NULL; |
| 740 | unsigned long ctx_expiry; |
| 741 | __u32 major; |
| 742 | int rc; |
| 743 | |
| 744 | memset(&rsci, 0, sizeof(rsci)); |
| 745 | |
| 746 | if (rawobj_alloc(&rsci.handle, (char *) &gsec->gs_rvs_hdl, |
| 747 | sizeof(gsec->gs_rvs_hdl))) |
| 748 | GOTO(out, rc = -ENOMEM); |
| 749 | |
| 750 | rscp = rsc_lookup(&rsci); |
| 751 | if (rscp == NULL) |
| 752 | GOTO(out, rc = -ENOMEM); |
| 753 | |
| 754 | major = lgss_copy_reverse_context(gctx->gc_mechctx, |
| 755 | &rsci.ctx.gsc_mechctx); |
| 756 | if (major != GSS_S_COMPLETE) |
| 757 | GOTO(out, rc = -ENOMEM); |
| 758 | |
| 759 | if (lgss_inquire_context(rsci.ctx.gsc_mechctx, &ctx_expiry)) { |
| 760 | CERROR("unable to get expire time, drop it\n"); |
| 761 | GOTO(out, rc = -EINVAL); |
| 762 | } |
| 763 | rsci.h.expiry_time = (time_t) ctx_expiry; |
| 764 | |
| 765 | if (strcmp(imp->imp_obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0) |
| 766 | rsci.ctx.gsc_usr_mds = 1; |
| 767 | else if (strcmp(imp->imp_obd->obd_type->typ_name, LUSTRE_OSC_NAME) == 0) |
| 768 | rsci.ctx.gsc_usr_oss = 1; |
| 769 | else |
| 770 | rsci.ctx.gsc_usr_root = 1; |
| 771 | |
| 772 | rscp = rsc_update(&rsci, rscp); |
| 773 | if (rscp == NULL) |
| 774 | GOTO(out, rc = -ENOMEM); |
| 775 | |
| 776 | rscp->target = imp->imp_obd; |
| 777 | rawobj_dup(&gctx->gc_svc_handle, &rscp->handle); |
| 778 | |
| 779 | CWARN("create reverse svc ctx %p to %s: idx "LPX64"\n", |
| 780 | &rscp->ctx, obd2cli_tgt(imp->imp_obd), gsec->gs_rvs_hdl); |
| 781 | rc = 0; |
| 782 | out: |
| 783 | if (rscp) |
| 784 | cache_put(&rscp->h, &rsc_cache); |
| 785 | rsc_free(&rsci); |
| 786 | |
| 787 | if (rc) |
| 788 | CERROR("create reverse svc ctx: idx "LPX64", rc %d\n", |
| 789 | gsec->gs_rvs_hdl, rc); |
| 790 | return rc; |
| 791 | } |
| 792 | |
| 793 | int gss_svc_upcall_expire_rvs_ctx(rawobj_t *handle) |
| 794 | { |
| 795 | const cfs_time_t expire = 20; |
| 796 | struct rsc *rscp; |
| 797 | |
| 798 | rscp = gss_svc_searchbyctx(handle); |
| 799 | if (rscp) { |
| 800 | CDEBUG(D_SEC, "reverse svcctx %p (rsc %p) expire soon\n", |
| 801 | &rscp->ctx, rscp); |
| 802 | |
| 803 | rscp->h.expiry_time = cfs_time_current_sec() + expire; |
| 804 | COMPAT_RSC_PUT(&rscp->h, &rsc_cache); |
| 805 | } |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | int gss_svc_upcall_dup_handle(rawobj_t *handle, struct gss_svc_ctx *ctx) |
| 810 | { |
| 811 | struct rsc *rscp = container_of(ctx, struct rsc, ctx); |
| 812 | |
| 813 | return rawobj_dup(handle, &rscp->handle); |
| 814 | } |
| 815 | |
| 816 | int gss_svc_upcall_update_sequence(rawobj_t *handle, __u32 seq) |
| 817 | { |
| 818 | struct rsc *rscp; |
| 819 | |
| 820 | rscp = gss_svc_searchbyctx(handle); |
| 821 | if (rscp) { |
| 822 | CDEBUG(D_SEC, "reverse svcctx %p (rsc %p) update seq to %u\n", |
| 823 | &rscp->ctx, rscp, seq + 1); |
| 824 | |
| 825 | rscp->ctx.gsc_rvs_seq = seq + 1; |
| 826 | COMPAT_RSC_PUT(&rscp->h, &rsc_cache); |
| 827 | } |
| 828 | return 0; |
| 829 | } |
| 830 | |
| 831 | static struct cache_deferred_req* cache_upcall_defer(struct cache_req *req) |
| 832 | { |
| 833 | return NULL; |
| 834 | } |
| 835 | static struct cache_req cache_upcall_chandle = { cache_upcall_defer }; |
| 836 | |
| 837 | int gss_svc_upcall_handle_init(struct ptlrpc_request *req, |
| 838 | struct gss_svc_reqctx *grctx, |
| 839 | struct gss_wire_ctx *gw, |
| 840 | struct obd_device *target, |
| 841 | __u32 lustre_svc, |
| 842 | rawobj_t *rvs_hdl, |
| 843 | rawobj_t *in_token) |
| 844 | { |
| 845 | struct ptlrpc_reply_state *rs; |
| 846 | struct rsc *rsci = NULL; |
| 847 | struct rsi *rsip = NULL, rsikey; |
| 848 | wait_queue_t wait; |
| 849 | int replen = sizeof(struct ptlrpc_body); |
| 850 | struct gss_rep_header *rephdr; |
| 851 | int first_check = 1; |
| 852 | int rc = SECSVC_DROP; |
| 853 | |
| 854 | memset(&rsikey, 0, sizeof(rsikey)); |
| 855 | rsikey.lustre_svc = lustre_svc; |
| 856 | rsikey.nid = (__u64) req->rq_peer.nid; |
| 857 | |
| 858 | /* duplicate context handle. for INIT it always 0 */ |
| 859 | if (rawobj_dup(&rsikey.in_handle, &gw->gw_handle)) { |
| 860 | CERROR("fail to dup context handle\n"); |
| 861 | GOTO(out, rc); |
| 862 | } |
| 863 | |
| 864 | if (rawobj_dup(&rsikey.in_token, in_token)) { |
| 865 | CERROR("can't duplicate token\n"); |
| 866 | rawobj_free(&rsikey.in_handle); |
| 867 | GOTO(out, rc); |
| 868 | } |
| 869 | |
| 870 | rsip = rsi_lookup(&rsikey); |
| 871 | rsi_free(&rsikey); |
| 872 | if (!rsip) { |
| 873 | CERROR("error in rsi_lookup.\n"); |
| 874 | |
| 875 | if (!gss_pack_err_notify(req, GSS_S_FAILURE, 0)) |
| 876 | rc = SECSVC_COMPLETE; |
| 877 | |
| 878 | GOTO(out, rc); |
| 879 | } |
| 880 | |
| 881 | cache_get(&rsip->h); /* take an extra ref */ |
| 882 | init_waitqueue_head(&rsip->waitq); |
| 883 | init_waitqueue_entry_current(&wait); |
| 884 | add_wait_queue(&rsip->waitq, &wait); |
| 885 | |
| 886 | cache_check: |
| 887 | /* Note each time cache_check() will drop a reference if return |
| 888 | * non-zero. We hold an extra reference on initial rsip, but must |
| 889 | * take care of following calls. */ |
| 890 | rc = cache_check(&rsi_cache, &rsip->h, &cache_upcall_chandle); |
| 891 | switch (rc) { |
| 892 | case -EAGAIN: { |
| 893 | int valid; |
| 894 | |
| 895 | if (first_check) { |
| 896 | first_check = 0; |
| 897 | |
| 898 | read_lock(&rsi_cache.hash_lock); |
| 899 | valid = test_bit(CACHE_VALID, &rsip->h.flags); |
| 900 | if (valid == 0) |
| 901 | set_current_state(TASK_INTERRUPTIBLE); |
| 902 | read_unlock(&rsi_cache.hash_lock); |
| 903 | |
| 904 | if (valid == 0) |
| 905 | schedule_timeout(GSS_SVC_UPCALL_TIMEOUT * |
| 906 | HZ); |
| 907 | |
| 908 | cache_get(&rsip->h); |
| 909 | goto cache_check; |
| 910 | } |
| 911 | CWARN("waited %ds timeout, drop\n", GSS_SVC_UPCALL_TIMEOUT); |
| 912 | break; |
| 913 | } |
| 914 | case -ENOENT: |
| 915 | CWARN("cache_check return ENOENT, drop\n"); |
| 916 | break; |
| 917 | case 0: |
| 918 | /* if not the first check, we have to release the extra |
| 919 | * reference we just added on it. */ |
| 920 | if (!first_check) |
| 921 | cache_put(&rsip->h, &rsi_cache); |
| 922 | CDEBUG(D_SEC, "cache_check is good\n"); |
| 923 | break; |
| 924 | } |
| 925 | |
| 926 | remove_wait_queue(&rsip->waitq, &wait); |
| 927 | cache_put(&rsip->h, &rsi_cache); |
| 928 | |
| 929 | if (rc) |
| 930 | GOTO(out, rc = SECSVC_DROP); |
| 931 | |
| 932 | rc = SECSVC_DROP; |
| 933 | rsci = gss_svc_searchbyctx(&rsip->out_handle); |
| 934 | if (!rsci) { |
| 935 | CERROR("authentication failed\n"); |
| 936 | |
| 937 | if (!gss_pack_err_notify(req, GSS_S_FAILURE, 0)) |
| 938 | rc = SECSVC_COMPLETE; |
| 939 | |
| 940 | GOTO(out, rc); |
| 941 | } else { |
| 942 | cache_get(&rsci->h); |
| 943 | grctx->src_ctx = &rsci->ctx; |
| 944 | } |
| 945 | |
| 946 | if (rawobj_dup(&rsci->ctx.gsc_rvs_hdl, rvs_hdl)) { |
| 947 | CERROR("failed duplicate reverse handle\n"); |
| 948 | GOTO(out, rc); |
| 949 | } |
| 950 | |
| 951 | rsci->target = target; |
| 952 | |
| 953 | CDEBUG(D_SEC, "server create rsc %p(%u->%s)\n", |
| 954 | rsci, rsci->ctx.gsc_uid, libcfs_nid2str(req->rq_peer.nid)); |
| 955 | |
| 956 | if (rsip->out_handle.len > PTLRPC_GSS_MAX_HANDLE_SIZE) { |
| 957 | CERROR("handle size %u too large\n", rsip->out_handle.len); |
| 958 | GOTO(out, rc = SECSVC_DROP); |
| 959 | } |
| 960 | |
| 961 | grctx->src_init = 1; |
| 962 | grctx->src_reserve_len = cfs_size_round4(rsip->out_token.len); |
| 963 | |
| 964 | rc = lustre_pack_reply_v2(req, 1, &replen, NULL, 0); |
| 965 | if (rc) { |
| 966 | CERROR("failed to pack reply: %d\n", rc); |
| 967 | GOTO(out, rc = SECSVC_DROP); |
| 968 | } |
| 969 | |
| 970 | rs = req->rq_reply_state; |
| 971 | LASSERT(rs->rs_repbuf->lm_bufcount == 3); |
| 972 | LASSERT(rs->rs_repbuf->lm_buflens[0] >= |
| 973 | sizeof(*rephdr) + rsip->out_handle.len); |
| 974 | LASSERT(rs->rs_repbuf->lm_buflens[2] >= rsip->out_token.len); |
| 975 | |
| 976 | rephdr = lustre_msg_buf(rs->rs_repbuf, 0, 0); |
| 977 | rephdr->gh_version = PTLRPC_GSS_VERSION; |
| 978 | rephdr->gh_flags = 0; |
| 979 | rephdr->gh_proc = PTLRPC_GSS_PROC_ERR; |
| 980 | rephdr->gh_major = rsip->major_status; |
| 981 | rephdr->gh_minor = rsip->minor_status; |
| 982 | rephdr->gh_seqwin = GSS_SEQ_WIN; |
| 983 | rephdr->gh_handle.len = rsip->out_handle.len; |
| 984 | memcpy(rephdr->gh_handle.data, rsip->out_handle.data, |
| 985 | rsip->out_handle.len); |
| 986 | |
| 987 | memcpy(lustre_msg_buf(rs->rs_repbuf, 2, 0), rsip->out_token.data, |
| 988 | rsip->out_token.len); |
| 989 | |
| 990 | rs->rs_repdata_len = lustre_shrink_msg(rs->rs_repbuf, 2, |
| 991 | rsip->out_token.len, 0); |
| 992 | |
| 993 | rc = SECSVC_OK; |
| 994 | |
| 995 | out: |
| 996 | /* it looks like here we should put rsip also, but this mess up |
| 997 | * with NFS cache mgmt code... FIXME */ |
| 998 | #if 0 |
| 999 | if (rsip) |
| 1000 | rsi_put(&rsip->h, &rsi_cache); |
| 1001 | #endif |
| 1002 | |
| 1003 | if (rsci) { |
| 1004 | /* if anything went wrong, we don't keep the context too */ |
| 1005 | if (rc != SECSVC_OK) |
| 1006 | set_bit(CACHE_NEGATIVE, &rsci->h.flags); |
| 1007 | else |
| 1008 | CDEBUG(D_SEC, "create rsc with idx "LPX64"\n", |
| 1009 | gss_handle_to_u64(&rsci->handle)); |
| 1010 | |
| 1011 | COMPAT_RSC_PUT(&rsci->h, &rsc_cache); |
| 1012 | } |
| 1013 | return rc; |
| 1014 | } |
| 1015 | |
| 1016 | struct gss_svc_ctx *gss_svc_upcall_get_ctx(struct ptlrpc_request *req, |
| 1017 | struct gss_wire_ctx *gw) |
| 1018 | { |
| 1019 | struct rsc *rsc; |
| 1020 | |
| 1021 | rsc = gss_svc_searchbyctx(&gw->gw_handle); |
| 1022 | if (!rsc) { |
| 1023 | CWARN("Invalid gss ctx idx "LPX64" from %s\n", |
| 1024 | gss_handle_to_u64(&gw->gw_handle), |
| 1025 | libcfs_nid2str(req->rq_peer.nid)); |
| 1026 | return NULL; |
| 1027 | } |
| 1028 | |
| 1029 | return &rsc->ctx; |
| 1030 | } |
| 1031 | |
| 1032 | void gss_svc_upcall_put_ctx(struct gss_svc_ctx *ctx) |
| 1033 | { |
| 1034 | struct rsc *rsc = container_of(ctx, struct rsc, ctx); |
| 1035 | |
| 1036 | COMPAT_RSC_PUT(&rsc->h, &rsc_cache); |
| 1037 | } |
| 1038 | |
| 1039 | void gss_svc_upcall_destroy_ctx(struct gss_svc_ctx *ctx) |
| 1040 | { |
| 1041 | struct rsc *rsc = container_of(ctx, struct rsc, ctx); |
| 1042 | |
| 1043 | /* can't be found */ |
| 1044 | set_bit(CACHE_NEGATIVE, &rsc->h.flags); |
| 1045 | /* to be removed at next scan */ |
| 1046 | rsc->h.expiry_time = 1; |
| 1047 | } |
| 1048 | |
| 1049 | int __init gss_init_svc_upcall(void) |
| 1050 | { |
| 1051 | int i; |
| 1052 | |
| 1053 | spin_lock_init(&__ctx_index_lock); |
| 1054 | /* |
| 1055 | * this helps reducing context index confliction. after server reboot, |
| 1056 | * conflicting request from clients might be filtered out by initial |
| 1057 | * sequence number checking, thus no chance to sent error notification |
| 1058 | * back to clients. |
| 1059 | */ |
| 1060 | cfs_get_random_bytes(&__ctx_index, sizeof(__ctx_index)); |
| 1061 | |
| 1062 | |
| 1063 | cache_register(&rsi_cache); |
| 1064 | cache_register(&rsc_cache); |
| 1065 | |
| 1066 | /* FIXME this looks stupid. we intend to give lsvcgssd a chance to open |
| 1067 | * the init upcall channel, otherwise there's big chance that the first |
| 1068 | * upcall issued before the channel be opened thus nfsv4 cache code will |
| 1069 | * drop the request direclty, thus lead to unnecessary recovery time. |
| 1070 | * here we wait at miximum 1.5 seconds. */ |
| 1071 | for (i = 0; i < 6; i++) { |
| 1072 | if (atomic_read(&rsi_cache.readers) > 0) |
| 1073 | break; |
| 1074 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 1075 | LASSERT(HZ >= 4); |
| 1076 | schedule_timeout(HZ / 4); |
| 1077 | } |
| 1078 | |
| 1079 | if (atomic_read(&rsi_cache.readers) == 0) |
| 1080 | CWARN("Init channel is not opened by lsvcgssd, following " |
| 1081 | "request might be dropped until lsvcgssd is active\n"); |
| 1082 | |
| 1083 | return 0; |
| 1084 | } |
| 1085 | |
| 1086 | void __exit gss_exit_svc_upcall(void) |
| 1087 | { |
| 1088 | cache_purge(&rsi_cache); |
| 1089 | cache_unregister(&rsi_cache); |
| 1090 | |
| 1091 | cache_purge(&rsc_cache); |
| 1092 | cache_unregister(&rsc_cache); |
| 1093 | } |