| 1 | /* |
| 2 | * fs/cifs/cifsacl.c |
| 3 | * |
| 4 | * Copyright (C) International Business Machines Corp., 2007,2008 |
| 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
| 6 | * |
| 7 | * Contains the routines for mapping CIFS/NTFS ACLs |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Lesser General Public License as published |
| 11 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 17 | * the GNU Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public License |
| 20 | * along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <linux/fs.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/keyctl.h> |
| 28 | #include <linux/key-type.h> |
| 29 | #include <keys/user-type.h> |
| 30 | #include "cifspdu.h" |
| 31 | #include "cifsglob.h" |
| 32 | #include "cifsacl.h" |
| 33 | #include "cifsproto.h" |
| 34 | #include "cifs_debug.h" |
| 35 | |
| 36 | /* security id for everyone/world system group */ |
| 37 | static const struct cifs_sid sid_everyone = { |
| 38 | 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; |
| 39 | /* security id for Authenticated Users system group */ |
| 40 | static const struct cifs_sid sid_authusers = { |
| 41 | 1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} }; |
| 42 | /* group users */ |
| 43 | static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} }; |
| 44 | |
| 45 | static const struct cred *root_cred; |
| 46 | |
| 47 | static int |
| 48 | cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep) |
| 49 | { |
| 50 | char *payload; |
| 51 | |
| 52 | /* |
| 53 | * If the payload is less than or equal to the size of a pointer, then |
| 54 | * an allocation here is wasteful. Just copy the data directly to the |
| 55 | * payload.value union member instead. |
| 56 | * |
| 57 | * With this however, you must check the datalen before trying to |
| 58 | * dereference payload.data! |
| 59 | */ |
| 60 | if (prep->datalen <= sizeof(key->payload)) { |
| 61 | key->payload.data[0] = NULL; |
| 62 | memcpy(&key->payload, prep->data, prep->datalen); |
| 63 | } else { |
| 64 | payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL); |
| 65 | if (!payload) |
| 66 | return -ENOMEM; |
| 67 | key->payload.data[0] = payload; |
| 68 | } |
| 69 | |
| 70 | key->datalen = prep->datalen; |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static inline void |
| 75 | cifs_idmap_key_destroy(struct key *key) |
| 76 | { |
| 77 | if (key->datalen > sizeof(key->payload)) |
| 78 | kfree(key->payload.data[0]); |
| 79 | } |
| 80 | |
| 81 | static struct key_type cifs_idmap_key_type = { |
| 82 | .name = "cifs.idmap", |
| 83 | .instantiate = cifs_idmap_key_instantiate, |
| 84 | .destroy = cifs_idmap_key_destroy, |
| 85 | .describe = user_describe, |
| 86 | }; |
| 87 | |
| 88 | static char * |
| 89 | sid_to_key_str(struct cifs_sid *sidptr, unsigned int type) |
| 90 | { |
| 91 | int i, len; |
| 92 | unsigned int saval; |
| 93 | char *sidstr, *strptr; |
| 94 | unsigned long long id_auth_val; |
| 95 | |
| 96 | /* 3 bytes for prefix */ |
| 97 | sidstr = kmalloc(3 + SID_STRING_BASE_SIZE + |
| 98 | (SID_STRING_SUBAUTH_SIZE * sidptr->num_subauth), |
| 99 | GFP_KERNEL); |
| 100 | if (!sidstr) |
| 101 | return sidstr; |
| 102 | |
| 103 | strptr = sidstr; |
| 104 | len = sprintf(strptr, "%cs:S-%hhu", type == SIDOWNER ? 'o' : 'g', |
| 105 | sidptr->revision); |
| 106 | strptr += len; |
| 107 | |
| 108 | /* The authority field is a single 48-bit number */ |
| 109 | id_auth_val = (unsigned long long)sidptr->authority[5]; |
| 110 | id_auth_val |= (unsigned long long)sidptr->authority[4] << 8; |
| 111 | id_auth_val |= (unsigned long long)sidptr->authority[3] << 16; |
| 112 | id_auth_val |= (unsigned long long)sidptr->authority[2] << 24; |
| 113 | id_auth_val |= (unsigned long long)sidptr->authority[1] << 32; |
| 114 | id_auth_val |= (unsigned long long)sidptr->authority[0] << 48; |
| 115 | |
| 116 | /* |
| 117 | * MS-DTYP states that if the authority is >= 2^32, then it should be |
| 118 | * expressed as a hex value. |
| 119 | */ |
| 120 | if (id_auth_val <= UINT_MAX) |
| 121 | len = sprintf(strptr, "-%llu", id_auth_val); |
| 122 | else |
| 123 | len = sprintf(strptr, "-0x%llx", id_auth_val); |
| 124 | |
| 125 | strptr += len; |
| 126 | |
| 127 | for (i = 0; i < sidptr->num_subauth; ++i) { |
| 128 | saval = le32_to_cpu(sidptr->sub_auth[i]); |
| 129 | len = sprintf(strptr, "-%u", saval); |
| 130 | strptr += len; |
| 131 | } |
| 132 | |
| 133 | return sidstr; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * if the two SIDs (roughly equivalent to a UUID for a user or group) are |
| 138 | * the same returns zero, if they do not match returns non-zero. |
| 139 | */ |
| 140 | static int |
| 141 | compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) |
| 142 | { |
| 143 | int i; |
| 144 | int num_subauth, num_sat, num_saw; |
| 145 | |
| 146 | if ((!ctsid) || (!cwsid)) |
| 147 | return 1; |
| 148 | |
| 149 | /* compare the revision */ |
| 150 | if (ctsid->revision != cwsid->revision) { |
| 151 | if (ctsid->revision > cwsid->revision) |
| 152 | return 1; |
| 153 | else |
| 154 | return -1; |
| 155 | } |
| 156 | |
| 157 | /* compare all of the six auth values */ |
| 158 | for (i = 0; i < NUM_AUTHS; ++i) { |
| 159 | if (ctsid->authority[i] != cwsid->authority[i]) { |
| 160 | if (ctsid->authority[i] > cwsid->authority[i]) |
| 161 | return 1; |
| 162 | else |
| 163 | return -1; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /* compare all of the subauth values if any */ |
| 168 | num_sat = ctsid->num_subauth; |
| 169 | num_saw = cwsid->num_subauth; |
| 170 | num_subauth = num_sat < num_saw ? num_sat : num_saw; |
| 171 | if (num_subauth) { |
| 172 | for (i = 0; i < num_subauth; ++i) { |
| 173 | if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { |
| 174 | if (le32_to_cpu(ctsid->sub_auth[i]) > |
| 175 | le32_to_cpu(cwsid->sub_auth[i])) |
| 176 | return 1; |
| 177 | else |
| 178 | return -1; |
| 179 | } |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | return 0; /* sids compare/match */ |
| 184 | } |
| 185 | |
| 186 | static void |
| 187 | cifs_copy_sid(struct cifs_sid *dst, const struct cifs_sid *src) |
| 188 | { |
| 189 | int i; |
| 190 | |
| 191 | dst->revision = src->revision; |
| 192 | dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES); |
| 193 | for (i = 0; i < NUM_AUTHS; ++i) |
| 194 | dst->authority[i] = src->authority[i]; |
| 195 | for (i = 0; i < dst->num_subauth; ++i) |
| 196 | dst->sub_auth[i] = src->sub_auth[i]; |
| 197 | } |
| 198 | |
| 199 | static int |
| 200 | id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) |
| 201 | { |
| 202 | int rc; |
| 203 | struct key *sidkey; |
| 204 | struct cifs_sid *ksid; |
| 205 | unsigned int ksid_size; |
| 206 | char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ |
| 207 | const struct cred *saved_cred; |
| 208 | |
| 209 | rc = snprintf(desc, sizeof(desc), "%ci:%u", |
| 210 | sidtype == SIDOWNER ? 'o' : 'g', cid); |
| 211 | if (rc >= sizeof(desc)) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | rc = 0; |
| 215 | saved_cred = override_creds(root_cred); |
| 216 | sidkey = request_key(&cifs_idmap_key_type, desc, ""); |
| 217 | if (IS_ERR(sidkey)) { |
| 218 | rc = -EINVAL; |
| 219 | cifs_dbg(FYI, "%s: Can't map %cid %u to a SID\n", |
| 220 | __func__, sidtype == SIDOWNER ? 'u' : 'g', cid); |
| 221 | goto out_revert_creds; |
| 222 | } else if (sidkey->datalen < CIFS_SID_BASE_SIZE) { |
| 223 | rc = -EIO; |
| 224 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
| 225 | __func__, sidkey->datalen); |
| 226 | goto invalidate_key; |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * A sid is usually too large to be embedded in payload.value, but if |
| 231 | * there are no subauthorities and the host has 8-byte pointers, then |
| 232 | * it could be. |
| 233 | */ |
| 234 | ksid = sidkey->datalen <= sizeof(sidkey->payload) ? |
| 235 | (struct cifs_sid *)&sidkey->payload : |
| 236 | (struct cifs_sid *)sidkey->payload.data[0]; |
| 237 | |
| 238 | ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); |
| 239 | if (ksid_size > sidkey->datalen) { |
| 240 | rc = -EIO; |
| 241 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu, ksid_size=%u)\n", |
| 242 | __func__, sidkey->datalen, ksid_size); |
| 243 | goto invalidate_key; |
| 244 | } |
| 245 | |
| 246 | cifs_copy_sid(ssid, ksid); |
| 247 | out_key_put: |
| 248 | key_put(sidkey); |
| 249 | out_revert_creds: |
| 250 | revert_creds(saved_cred); |
| 251 | return rc; |
| 252 | |
| 253 | invalidate_key: |
| 254 | key_invalidate(sidkey); |
| 255 | goto out_key_put; |
| 256 | } |
| 257 | |
| 258 | static int |
| 259 | sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, |
| 260 | struct cifs_fattr *fattr, uint sidtype) |
| 261 | { |
| 262 | int rc; |
| 263 | struct key *sidkey; |
| 264 | char *sidstr; |
| 265 | const struct cred *saved_cred; |
| 266 | kuid_t fuid = cifs_sb->mnt_uid; |
| 267 | kgid_t fgid = cifs_sb->mnt_gid; |
| 268 | |
| 269 | /* |
| 270 | * If we have too many subauthorities, then something is really wrong. |
| 271 | * Just return an error. |
| 272 | */ |
| 273 | if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) { |
| 274 | cifs_dbg(FYI, "%s: %u subauthorities is too many!\n", |
| 275 | __func__, psid->num_subauth); |
| 276 | return -EIO; |
| 277 | } |
| 278 | |
| 279 | sidstr = sid_to_key_str(psid, sidtype); |
| 280 | if (!sidstr) |
| 281 | return -ENOMEM; |
| 282 | |
| 283 | saved_cred = override_creds(root_cred); |
| 284 | sidkey = request_key(&cifs_idmap_key_type, sidstr, ""); |
| 285 | if (IS_ERR(sidkey)) { |
| 286 | rc = -EINVAL; |
| 287 | cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n", |
| 288 | __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g'); |
| 289 | goto out_revert_creds; |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * FIXME: Here we assume that uid_t and gid_t are same size. It's |
| 294 | * probably a safe assumption but might be better to check based on |
| 295 | * sidtype. |
| 296 | */ |
| 297 | BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t)); |
| 298 | if (sidkey->datalen != sizeof(uid_t)) { |
| 299 | rc = -EIO; |
| 300 | cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
| 301 | __func__, sidkey->datalen); |
| 302 | key_invalidate(sidkey); |
| 303 | goto out_key_put; |
| 304 | } |
| 305 | |
| 306 | if (sidtype == SIDOWNER) { |
| 307 | kuid_t uid; |
| 308 | uid_t id; |
| 309 | memcpy(&id, &sidkey->payload.data[0], sizeof(uid_t)); |
| 310 | uid = make_kuid(&init_user_ns, id); |
| 311 | if (uid_valid(uid)) |
| 312 | fuid = uid; |
| 313 | } else { |
| 314 | kgid_t gid; |
| 315 | gid_t id; |
| 316 | memcpy(&id, &sidkey->payload.data[0], sizeof(gid_t)); |
| 317 | gid = make_kgid(&init_user_ns, id); |
| 318 | if (gid_valid(gid)) |
| 319 | fgid = gid; |
| 320 | } |
| 321 | |
| 322 | out_key_put: |
| 323 | key_put(sidkey); |
| 324 | out_revert_creds: |
| 325 | revert_creds(saved_cred); |
| 326 | kfree(sidstr); |
| 327 | |
| 328 | /* |
| 329 | * Note that we return 0 here unconditionally. If the mapping |
| 330 | * fails then we just fall back to using the mnt_uid/mnt_gid. |
| 331 | */ |
| 332 | if (sidtype == SIDOWNER) |
| 333 | fattr->cf_uid = fuid; |
| 334 | else |
| 335 | fattr->cf_gid = fgid; |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | int |
| 340 | init_cifs_idmap(void) |
| 341 | { |
| 342 | struct cred *cred; |
| 343 | struct key *keyring; |
| 344 | int ret; |
| 345 | |
| 346 | cifs_dbg(FYI, "Registering the %s key type\n", |
| 347 | cifs_idmap_key_type.name); |
| 348 | |
| 349 | /* create an override credential set with a special thread keyring in |
| 350 | * which requests are cached |
| 351 | * |
| 352 | * this is used to prevent malicious redirections from being installed |
| 353 | * with add_key(). |
| 354 | */ |
| 355 | cred = prepare_kernel_cred(NULL); |
| 356 | if (!cred) |
| 357 | return -ENOMEM; |
| 358 | |
| 359 | keyring = keyring_alloc(".cifs_idmap", |
| 360 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, |
| 361 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | |
| 362 | KEY_USR_VIEW | KEY_USR_READ, |
| 363 | KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); |
| 364 | if (IS_ERR(keyring)) { |
| 365 | ret = PTR_ERR(keyring); |
| 366 | goto failed_put_cred; |
| 367 | } |
| 368 | |
| 369 | ret = register_key_type(&cifs_idmap_key_type); |
| 370 | if (ret < 0) |
| 371 | goto failed_put_key; |
| 372 | |
| 373 | /* instruct request_key() to use this special keyring as a cache for |
| 374 | * the results it looks up */ |
| 375 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
| 376 | cred->thread_keyring = keyring; |
| 377 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; |
| 378 | root_cred = cred; |
| 379 | |
| 380 | cifs_dbg(FYI, "cifs idmap keyring: %d\n", key_serial(keyring)); |
| 381 | return 0; |
| 382 | |
| 383 | failed_put_key: |
| 384 | key_put(keyring); |
| 385 | failed_put_cred: |
| 386 | put_cred(cred); |
| 387 | return ret; |
| 388 | } |
| 389 | |
| 390 | void |
| 391 | exit_cifs_idmap(void) |
| 392 | { |
| 393 | key_revoke(root_cred->thread_keyring); |
| 394 | unregister_key_type(&cifs_idmap_key_type); |
| 395 | put_cred(root_cred); |
| 396 | cifs_dbg(FYI, "Unregistered %s key type\n", cifs_idmap_key_type.name); |
| 397 | } |
| 398 | |
| 399 | /* copy ntsd, owner sid, and group sid from a security descriptor to another */ |
| 400 | static void copy_sec_desc(const struct cifs_ntsd *pntsd, |
| 401 | struct cifs_ntsd *pnntsd, __u32 sidsoffset) |
| 402 | { |
| 403 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| 404 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
| 405 | |
| 406 | /* copy security descriptor control portion */ |
| 407 | pnntsd->revision = pntsd->revision; |
| 408 | pnntsd->type = pntsd->type; |
| 409 | pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); |
| 410 | pnntsd->sacloffset = 0; |
| 411 | pnntsd->osidoffset = cpu_to_le32(sidsoffset); |
| 412 | pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); |
| 413 | |
| 414 | /* copy owner sid */ |
| 415 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| 416 | le32_to_cpu(pntsd->osidoffset)); |
| 417 | nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); |
| 418 | cifs_copy_sid(nowner_sid_ptr, owner_sid_ptr); |
| 419 | |
| 420 | /* copy group sid */ |
| 421 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| 422 | le32_to_cpu(pntsd->gsidoffset)); |
| 423 | ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + |
| 424 | sizeof(struct cifs_sid)); |
| 425 | cifs_copy_sid(ngroup_sid_ptr, group_sid_ptr); |
| 426 | |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | |
| 431 | /* |
| 432 | change posix mode to reflect permissions |
| 433 | pmode is the existing mode (we only want to overwrite part of this |
| 434 | bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 |
| 435 | */ |
| 436 | static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
| 437 | umode_t *pbits_to_set) |
| 438 | { |
| 439 | __u32 flags = le32_to_cpu(ace_flags); |
| 440 | /* the order of ACEs is important. The canonical order is to begin with |
| 441 | DENY entries followed by ALLOW, otherwise an allow entry could be |
| 442 | encountered first, making the subsequent deny entry like "dead code" |
| 443 | which would be superflous since Windows stops when a match is made |
| 444 | for the operation you are trying to perform for your user */ |
| 445 | |
| 446 | /* For deny ACEs we change the mask so that subsequent allow access |
| 447 | control entries do not turn on the bits we are denying */ |
| 448 | if (type == ACCESS_DENIED) { |
| 449 | if (flags & GENERIC_ALL) |
| 450 | *pbits_to_set &= ~S_IRWXUGO; |
| 451 | |
| 452 | if ((flags & GENERIC_WRITE) || |
| 453 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) |
| 454 | *pbits_to_set &= ~S_IWUGO; |
| 455 | if ((flags & GENERIC_READ) || |
| 456 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) |
| 457 | *pbits_to_set &= ~S_IRUGO; |
| 458 | if ((flags & GENERIC_EXECUTE) || |
| 459 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) |
| 460 | *pbits_to_set &= ~S_IXUGO; |
| 461 | return; |
| 462 | } else if (type != ACCESS_ALLOWED) { |
| 463 | cifs_dbg(VFS, "unknown access control type %d\n", type); |
| 464 | return; |
| 465 | } |
| 466 | /* else ACCESS_ALLOWED type */ |
| 467 | |
| 468 | if (flags & GENERIC_ALL) { |
| 469 | *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
| 470 | cifs_dbg(NOISY, "all perms\n"); |
| 471 | return; |
| 472 | } |
| 473 | if ((flags & GENERIC_WRITE) || |
| 474 | ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) |
| 475 | *pmode |= (S_IWUGO & (*pbits_to_set)); |
| 476 | if ((flags & GENERIC_READ) || |
| 477 | ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) |
| 478 | *pmode |= (S_IRUGO & (*pbits_to_set)); |
| 479 | if ((flags & GENERIC_EXECUTE) || |
| 480 | ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) |
| 481 | *pmode |= (S_IXUGO & (*pbits_to_set)); |
| 482 | |
| 483 | cifs_dbg(NOISY, "access flags 0x%x mode now 0x%x\n", flags, *pmode); |
| 484 | return; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | Generate access flags to reflect permissions mode is the existing mode. |
| 489 | This function is called for every ACE in the DACL whose SID matches |
| 490 | with either owner or group or everyone. |
| 491 | */ |
| 492 | |
| 493 | static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, |
| 494 | __u32 *pace_flags) |
| 495 | { |
| 496 | /* reset access mask */ |
| 497 | *pace_flags = 0x0; |
| 498 | |
| 499 | /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ |
| 500 | mode &= bits_to_use; |
| 501 | |
| 502 | /* check for R/W/X UGO since we do not know whose flags |
| 503 | is this but we have cleared all the bits sans RWX for |
| 504 | either user or group or other as per bits_to_use */ |
| 505 | if (mode & S_IRUGO) |
| 506 | *pace_flags |= SET_FILE_READ_RIGHTS; |
| 507 | if (mode & S_IWUGO) |
| 508 | *pace_flags |= SET_FILE_WRITE_RIGHTS; |
| 509 | if (mode & S_IXUGO) |
| 510 | *pace_flags |= SET_FILE_EXEC_RIGHTS; |
| 511 | |
| 512 | cifs_dbg(NOISY, "mode: 0x%x, access flags now 0x%x\n", |
| 513 | mode, *pace_flags); |
| 514 | return; |
| 515 | } |
| 516 | |
| 517 | static __u16 fill_ace_for_sid(struct cifs_ace *pntace, |
| 518 | const struct cifs_sid *psid, __u64 nmode, umode_t bits) |
| 519 | { |
| 520 | int i; |
| 521 | __u16 size = 0; |
| 522 | __u32 access_req = 0; |
| 523 | |
| 524 | pntace->type = ACCESS_ALLOWED; |
| 525 | pntace->flags = 0x0; |
| 526 | mode_to_access_flags(nmode, bits, &access_req); |
| 527 | if (!access_req) |
| 528 | access_req = SET_MINIMUM_RIGHTS; |
| 529 | pntace->access_req = cpu_to_le32(access_req); |
| 530 | |
| 531 | pntace->sid.revision = psid->revision; |
| 532 | pntace->sid.num_subauth = psid->num_subauth; |
| 533 | for (i = 0; i < NUM_AUTHS; i++) |
| 534 | pntace->sid.authority[i] = psid->authority[i]; |
| 535 | for (i = 0; i < psid->num_subauth; i++) |
| 536 | pntace->sid.sub_auth[i] = psid->sub_auth[i]; |
| 537 | |
| 538 | size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); |
| 539 | pntace->size = cpu_to_le16(size); |
| 540 | |
| 541 | return size; |
| 542 | } |
| 543 | |
| 544 | |
| 545 | #ifdef CONFIG_CIFS_DEBUG2 |
| 546 | static void dump_ace(struct cifs_ace *pace, char *end_of_acl) |
| 547 | { |
| 548 | int num_subauth; |
| 549 | |
| 550 | /* validate that we do not go past end of acl */ |
| 551 | |
| 552 | if (le16_to_cpu(pace->size) < 16) { |
| 553 | cifs_dbg(VFS, "ACE too small %d\n", le16_to_cpu(pace->size)); |
| 554 | return; |
| 555 | } |
| 556 | |
| 557 | if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { |
| 558 | cifs_dbg(VFS, "ACL too small to parse ACE\n"); |
| 559 | return; |
| 560 | } |
| 561 | |
| 562 | num_subauth = pace->sid.num_subauth; |
| 563 | if (num_subauth) { |
| 564 | int i; |
| 565 | cifs_dbg(FYI, "ACE revision %d num_auth %d type %d flags %d size %d\n", |
| 566 | pace->sid.revision, pace->sid.num_subauth, pace->type, |
| 567 | pace->flags, le16_to_cpu(pace->size)); |
| 568 | for (i = 0; i < num_subauth; ++i) { |
| 569 | cifs_dbg(FYI, "ACE sub_auth[%d]: 0x%x\n", |
| 570 | i, le32_to_cpu(pace->sid.sub_auth[i])); |
| 571 | } |
| 572 | |
| 573 | /* BB add length check to make sure that we do not have huge |
| 574 | num auths and therefore go off the end */ |
| 575 | } |
| 576 | |
| 577 | return; |
| 578 | } |
| 579 | #endif |
| 580 | |
| 581 | |
| 582 | static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
| 583 | struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
| 584 | struct cifs_fattr *fattr) |
| 585 | { |
| 586 | int i; |
| 587 | int num_aces = 0; |
| 588 | int acl_size; |
| 589 | char *acl_base; |
| 590 | struct cifs_ace **ppace; |
| 591 | |
| 592 | /* BB need to add parm so we can store the SID BB */ |
| 593 | |
| 594 | if (!pdacl) { |
| 595 | /* no DACL in the security descriptor, set |
| 596 | all the permissions for user/group/other */ |
| 597 | fattr->cf_mode |= S_IRWXUGO; |
| 598 | return; |
| 599 | } |
| 600 | |
| 601 | /* validate that we do not go past end of acl */ |
| 602 | if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
| 603 | cifs_dbg(VFS, "ACL too small to parse DACL\n"); |
| 604 | return; |
| 605 | } |
| 606 | |
| 607 | cifs_dbg(NOISY, "DACL revision %d size %d num aces %d\n", |
| 608 | le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
| 609 | le32_to_cpu(pdacl->num_aces)); |
| 610 | |
| 611 | /* reset rwx permissions for user/group/other. |
| 612 | Also, if num_aces is 0 i.e. DACL has no ACEs, |
| 613 | user/group/other have no permissions */ |
| 614 | fattr->cf_mode &= ~(S_IRWXUGO); |
| 615 | |
| 616 | acl_base = (char *)pdacl; |
| 617 | acl_size = sizeof(struct cifs_acl); |
| 618 | |
| 619 | num_aces = le32_to_cpu(pdacl->num_aces); |
| 620 | if (num_aces > 0) { |
| 621 | umode_t user_mask = S_IRWXU; |
| 622 | umode_t group_mask = S_IRWXG; |
| 623 | umode_t other_mask = S_IRWXU | S_IRWXG | S_IRWXO; |
| 624 | |
| 625 | if (num_aces > ULONG_MAX / sizeof(struct cifs_ace *)) |
| 626 | return; |
| 627 | ppace = kmalloc(num_aces * sizeof(struct cifs_ace *), |
| 628 | GFP_KERNEL); |
| 629 | if (!ppace) |
| 630 | return; |
| 631 | |
| 632 | for (i = 0; i < num_aces; ++i) { |
| 633 | ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
| 634 | #ifdef CONFIG_CIFS_DEBUG2 |
| 635 | dump_ace(ppace[i], end_of_acl); |
| 636 | #endif |
| 637 | if (compare_sids(&(ppace[i]->sid), pownersid) == 0) |
| 638 | access_flags_to_mode(ppace[i]->access_req, |
| 639 | ppace[i]->type, |
| 640 | &fattr->cf_mode, |
| 641 | &user_mask); |
| 642 | if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) |
| 643 | access_flags_to_mode(ppace[i]->access_req, |
| 644 | ppace[i]->type, |
| 645 | &fattr->cf_mode, |
| 646 | &group_mask); |
| 647 | if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) |
| 648 | access_flags_to_mode(ppace[i]->access_req, |
| 649 | ppace[i]->type, |
| 650 | &fattr->cf_mode, |
| 651 | &other_mask); |
| 652 | if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0) |
| 653 | access_flags_to_mode(ppace[i]->access_req, |
| 654 | ppace[i]->type, |
| 655 | &fattr->cf_mode, |
| 656 | &other_mask); |
| 657 | |
| 658 | |
| 659 | /* memcpy((void *)(&(cifscred->aces[i])), |
| 660 | (void *)ppace[i], |
| 661 | sizeof(struct cifs_ace)); */ |
| 662 | |
| 663 | acl_base = (char *)ppace[i]; |
| 664 | acl_size = le16_to_cpu(ppace[i]->size); |
| 665 | } |
| 666 | |
| 667 | kfree(ppace); |
| 668 | } |
| 669 | |
| 670 | return; |
| 671 | } |
| 672 | |
| 673 | |
| 674 | static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
| 675 | struct cifs_sid *pgrpsid, __u64 nmode) |
| 676 | { |
| 677 | u16 size = 0; |
| 678 | struct cifs_acl *pnndacl; |
| 679 | |
| 680 | pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); |
| 681 | |
| 682 | size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), |
| 683 | pownersid, nmode, S_IRWXU); |
| 684 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), |
| 685 | pgrpsid, nmode, S_IRWXG); |
| 686 | size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), |
| 687 | &sid_everyone, nmode, S_IRWXO); |
| 688 | |
| 689 | pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); |
| 690 | pndacl->num_aces = cpu_to_le32(3); |
| 691 | |
| 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | |
| 696 | static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
| 697 | { |
| 698 | /* BB need to add parm so we can store the SID BB */ |
| 699 | |
| 700 | /* validate that we do not go past end of ACL - sid must be at least 8 |
| 701 | bytes long (assuming no sub-auths - e.g. the null SID */ |
| 702 | if (end_of_acl < (char *)psid + 8) { |
| 703 | cifs_dbg(VFS, "ACL too small to parse SID %p\n", psid); |
| 704 | return -EINVAL; |
| 705 | } |
| 706 | |
| 707 | #ifdef CONFIG_CIFS_DEBUG2 |
| 708 | if (psid->num_subauth) { |
| 709 | int i; |
| 710 | cifs_dbg(FYI, "SID revision %d num_auth %d\n", |
| 711 | psid->revision, psid->num_subauth); |
| 712 | |
| 713 | for (i = 0; i < psid->num_subauth; i++) { |
| 714 | cifs_dbg(FYI, "SID sub_auth[%d]: 0x%x\n", |
| 715 | i, le32_to_cpu(psid->sub_auth[i])); |
| 716 | } |
| 717 | |
| 718 | /* BB add length check to make sure that we do not have huge |
| 719 | num auths and therefore go off the end */ |
| 720 | cifs_dbg(FYI, "RID 0x%x\n", |
| 721 | le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); |
| 722 | } |
| 723 | #endif |
| 724 | |
| 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | |
| 729 | /* Convert CIFS ACL to POSIX form */ |
| 730 | static int parse_sec_desc(struct cifs_sb_info *cifs_sb, |
| 731 | struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr) |
| 732 | { |
| 733 | int rc = 0; |
| 734 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| 735 | struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ |
| 736 | char *end_of_acl = ((char *)pntsd) + acl_len; |
| 737 | __u32 dacloffset; |
| 738 | |
| 739 | if (pntsd == NULL) |
| 740 | return -EIO; |
| 741 | |
| 742 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| 743 | le32_to_cpu(pntsd->osidoffset)); |
| 744 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| 745 | le32_to_cpu(pntsd->gsidoffset)); |
| 746 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
| 747 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
| 748 | cifs_dbg(NOISY, "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", |
| 749 | pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
| 750 | le32_to_cpu(pntsd->gsidoffset), |
| 751 | le32_to_cpu(pntsd->sacloffset), dacloffset); |
| 752 | /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
| 753 | rc = parse_sid(owner_sid_ptr, end_of_acl); |
| 754 | if (rc) { |
| 755 | cifs_dbg(FYI, "%s: Error %d parsing Owner SID\n", __func__, rc); |
| 756 | return rc; |
| 757 | } |
| 758 | rc = sid_to_id(cifs_sb, owner_sid_ptr, fattr, SIDOWNER); |
| 759 | if (rc) { |
| 760 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to uid\n", |
| 761 | __func__, rc); |
| 762 | return rc; |
| 763 | } |
| 764 | |
| 765 | rc = parse_sid(group_sid_ptr, end_of_acl); |
| 766 | if (rc) { |
| 767 | cifs_dbg(FYI, "%s: Error %d mapping Owner SID to gid\n", |
| 768 | __func__, rc); |
| 769 | return rc; |
| 770 | } |
| 771 | rc = sid_to_id(cifs_sb, group_sid_ptr, fattr, SIDGROUP); |
| 772 | if (rc) { |
| 773 | cifs_dbg(FYI, "%s: Error %d mapping Group SID to gid\n", |
| 774 | __func__, rc); |
| 775 | return rc; |
| 776 | } |
| 777 | |
| 778 | if (dacloffset) |
| 779 | parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, |
| 780 | group_sid_ptr, fattr); |
| 781 | else |
| 782 | cifs_dbg(FYI, "no ACL\n"); /* BB grant all or default perms? */ |
| 783 | |
| 784 | return rc; |
| 785 | } |
| 786 | |
| 787 | /* Convert permission bits from mode to equivalent CIFS ACL */ |
| 788 | static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, |
| 789 | __u32 secdesclen, __u64 nmode, kuid_t uid, kgid_t gid, int *aclflag) |
| 790 | { |
| 791 | int rc = 0; |
| 792 | __u32 dacloffset; |
| 793 | __u32 ndacloffset; |
| 794 | __u32 sidsoffset; |
| 795 | struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| 796 | struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
| 797 | struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ |
| 798 | struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ |
| 799 | |
| 800 | if (nmode != NO_CHANGE_64) { /* chmod */ |
| 801 | owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| 802 | le32_to_cpu(pntsd->osidoffset)); |
| 803 | group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| 804 | le32_to_cpu(pntsd->gsidoffset)); |
| 805 | dacloffset = le32_to_cpu(pntsd->dacloffset); |
| 806 | dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
| 807 | ndacloffset = sizeof(struct cifs_ntsd); |
| 808 | ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); |
| 809 | ndacl_ptr->revision = dacl_ptr->revision; |
| 810 | ndacl_ptr->size = 0; |
| 811 | ndacl_ptr->num_aces = 0; |
| 812 | |
| 813 | rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, |
| 814 | nmode); |
| 815 | sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); |
| 816 | /* copy sec desc control portion & owner and group sids */ |
| 817 | copy_sec_desc(pntsd, pnntsd, sidsoffset); |
| 818 | *aclflag = CIFS_ACL_DACL; |
| 819 | } else { |
| 820 | memcpy(pnntsd, pntsd, secdesclen); |
| 821 | if (uid_valid(uid)) { /* chown */ |
| 822 | uid_t id; |
| 823 | owner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
| 824 | le32_to_cpu(pnntsd->osidoffset)); |
| 825 | nowner_sid_ptr = kmalloc(sizeof(struct cifs_sid), |
| 826 | GFP_KERNEL); |
| 827 | if (!nowner_sid_ptr) |
| 828 | return -ENOMEM; |
| 829 | id = from_kuid(&init_user_ns, uid); |
| 830 | rc = id_to_sid(id, SIDOWNER, nowner_sid_ptr); |
| 831 | if (rc) { |
| 832 | cifs_dbg(FYI, "%s: Mapping error %d for owner id %d\n", |
| 833 | __func__, rc, id); |
| 834 | kfree(nowner_sid_ptr); |
| 835 | return rc; |
| 836 | } |
| 837 | cifs_copy_sid(owner_sid_ptr, nowner_sid_ptr); |
| 838 | kfree(nowner_sid_ptr); |
| 839 | *aclflag = CIFS_ACL_OWNER; |
| 840 | } |
| 841 | if (gid_valid(gid)) { /* chgrp */ |
| 842 | gid_t id; |
| 843 | group_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
| 844 | le32_to_cpu(pnntsd->gsidoffset)); |
| 845 | ngroup_sid_ptr = kmalloc(sizeof(struct cifs_sid), |
| 846 | GFP_KERNEL); |
| 847 | if (!ngroup_sid_ptr) |
| 848 | return -ENOMEM; |
| 849 | id = from_kgid(&init_user_ns, gid); |
| 850 | rc = id_to_sid(id, SIDGROUP, ngroup_sid_ptr); |
| 851 | if (rc) { |
| 852 | cifs_dbg(FYI, "%s: Mapping error %d for group id %d\n", |
| 853 | __func__, rc, id); |
| 854 | kfree(ngroup_sid_ptr); |
| 855 | return rc; |
| 856 | } |
| 857 | cifs_copy_sid(group_sid_ptr, ngroup_sid_ptr); |
| 858 | kfree(ngroup_sid_ptr); |
| 859 | *aclflag = CIFS_ACL_GROUP; |
| 860 | } |
| 861 | } |
| 862 | |
| 863 | return rc; |
| 864 | } |
| 865 | |
| 866 | struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, |
| 867 | const struct cifs_fid *cifsfid, u32 *pacllen) |
| 868 | { |
| 869 | struct cifs_ntsd *pntsd = NULL; |
| 870 | unsigned int xid; |
| 871 | int rc; |
| 872 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| 873 | |
| 874 | if (IS_ERR(tlink)) |
| 875 | return ERR_CAST(tlink); |
| 876 | |
| 877 | xid = get_xid(); |
| 878 | rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), cifsfid->netfid, &pntsd, |
| 879 | pacllen); |
| 880 | free_xid(xid); |
| 881 | |
| 882 | cifs_put_tlink(tlink); |
| 883 | |
| 884 | cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
| 885 | if (rc) |
| 886 | return ERR_PTR(rc); |
| 887 | return pntsd; |
| 888 | } |
| 889 | |
| 890 | static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, |
| 891 | const char *path, u32 *pacllen) |
| 892 | { |
| 893 | struct cifs_ntsd *pntsd = NULL; |
| 894 | int oplock = 0; |
| 895 | unsigned int xid; |
| 896 | int rc, create_options = 0; |
| 897 | struct cifs_tcon *tcon; |
| 898 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| 899 | struct cifs_fid fid; |
| 900 | struct cifs_open_parms oparms; |
| 901 | |
| 902 | if (IS_ERR(tlink)) |
| 903 | return ERR_CAST(tlink); |
| 904 | |
| 905 | tcon = tlink_tcon(tlink); |
| 906 | xid = get_xid(); |
| 907 | |
| 908 | if (backup_cred(cifs_sb)) |
| 909 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 910 | |
| 911 | oparms.tcon = tcon; |
| 912 | oparms.cifs_sb = cifs_sb; |
| 913 | oparms.desired_access = READ_CONTROL; |
| 914 | oparms.create_options = create_options; |
| 915 | oparms.disposition = FILE_OPEN; |
| 916 | oparms.path = path; |
| 917 | oparms.fid = &fid; |
| 918 | oparms.reconnect = false; |
| 919 | |
| 920 | rc = CIFS_open(xid, &oparms, &oplock, NULL); |
| 921 | if (!rc) { |
| 922 | rc = CIFSSMBGetCIFSACL(xid, tcon, fid.netfid, &pntsd, pacllen); |
| 923 | CIFSSMBClose(xid, tcon, fid.netfid); |
| 924 | } |
| 925 | |
| 926 | cifs_put_tlink(tlink); |
| 927 | free_xid(xid); |
| 928 | |
| 929 | cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
| 930 | if (rc) |
| 931 | return ERR_PTR(rc); |
| 932 | return pntsd; |
| 933 | } |
| 934 | |
| 935 | /* Retrieve an ACL from the server */ |
| 936 | struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, |
| 937 | struct inode *inode, const char *path, |
| 938 | u32 *pacllen) |
| 939 | { |
| 940 | struct cifs_ntsd *pntsd = NULL; |
| 941 | struct cifsFileInfo *open_file = NULL; |
| 942 | |
| 943 | if (inode) |
| 944 | open_file = find_readable_file(CIFS_I(inode), true); |
| 945 | if (!open_file) |
| 946 | return get_cifs_acl_by_path(cifs_sb, path, pacllen); |
| 947 | |
| 948 | pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen); |
| 949 | cifsFileInfo_put(open_file); |
| 950 | return pntsd; |
| 951 | } |
| 952 | |
| 953 | /* Set an ACL on the server */ |
| 954 | int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, |
| 955 | struct inode *inode, const char *path, int aclflag) |
| 956 | { |
| 957 | int oplock = 0; |
| 958 | unsigned int xid; |
| 959 | int rc, access_flags, create_options = 0; |
| 960 | struct cifs_tcon *tcon; |
| 961 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 962 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| 963 | struct cifs_fid fid; |
| 964 | struct cifs_open_parms oparms; |
| 965 | |
| 966 | if (IS_ERR(tlink)) |
| 967 | return PTR_ERR(tlink); |
| 968 | |
| 969 | tcon = tlink_tcon(tlink); |
| 970 | xid = get_xid(); |
| 971 | |
| 972 | if (backup_cred(cifs_sb)) |
| 973 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 974 | |
| 975 | if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP) |
| 976 | access_flags = WRITE_OWNER; |
| 977 | else |
| 978 | access_flags = WRITE_DAC; |
| 979 | |
| 980 | oparms.tcon = tcon; |
| 981 | oparms.cifs_sb = cifs_sb; |
| 982 | oparms.desired_access = access_flags; |
| 983 | oparms.create_options = create_options; |
| 984 | oparms.disposition = FILE_OPEN; |
| 985 | oparms.path = path; |
| 986 | oparms.fid = &fid; |
| 987 | oparms.reconnect = false; |
| 988 | |
| 989 | rc = CIFS_open(xid, &oparms, &oplock, NULL); |
| 990 | if (rc) { |
| 991 | cifs_dbg(VFS, "Unable to open file to set ACL\n"); |
| 992 | goto out; |
| 993 | } |
| 994 | |
| 995 | rc = CIFSSMBSetCIFSACL(xid, tcon, fid.netfid, pnntsd, acllen, aclflag); |
| 996 | cifs_dbg(NOISY, "SetCIFSACL rc = %d\n", rc); |
| 997 | |
| 998 | CIFSSMBClose(xid, tcon, fid.netfid); |
| 999 | out: |
| 1000 | free_xid(xid); |
| 1001 | cifs_put_tlink(tlink); |
| 1002 | return rc; |
| 1003 | } |
| 1004 | |
| 1005 | /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */ |
| 1006 | int |
| 1007 | cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, |
| 1008 | struct inode *inode, const char *path, |
| 1009 | const struct cifs_fid *pfid) |
| 1010 | { |
| 1011 | struct cifs_ntsd *pntsd = NULL; |
| 1012 | u32 acllen = 0; |
| 1013 | int rc = 0; |
| 1014 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| 1015 | struct cifs_tcon *tcon; |
| 1016 | |
| 1017 | cifs_dbg(NOISY, "converting ACL to mode for %s\n", path); |
| 1018 | |
| 1019 | if (IS_ERR(tlink)) |
| 1020 | return PTR_ERR(tlink); |
| 1021 | tcon = tlink_tcon(tlink); |
| 1022 | |
| 1023 | if (pfid && (tcon->ses->server->ops->get_acl_by_fid)) |
| 1024 | pntsd = tcon->ses->server->ops->get_acl_by_fid(cifs_sb, pfid, |
| 1025 | &acllen); |
| 1026 | else if (tcon->ses->server->ops->get_acl) |
| 1027 | pntsd = tcon->ses->server->ops->get_acl(cifs_sb, inode, path, |
| 1028 | &acllen); |
| 1029 | else { |
| 1030 | cifs_put_tlink(tlink); |
| 1031 | return -EOPNOTSUPP; |
| 1032 | } |
| 1033 | /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ |
| 1034 | if (IS_ERR(pntsd)) { |
| 1035 | rc = PTR_ERR(pntsd); |
| 1036 | cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
| 1037 | } else { |
| 1038 | rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr); |
| 1039 | kfree(pntsd); |
| 1040 | if (rc) |
| 1041 | cifs_dbg(VFS, "parse sec desc failed rc = %d\n", rc); |
| 1042 | } |
| 1043 | |
| 1044 | cifs_put_tlink(tlink); |
| 1045 | |
| 1046 | return rc; |
| 1047 | } |
| 1048 | |
| 1049 | /* Convert mode bits to an ACL so we can update the ACL on the server */ |
| 1050 | int |
| 1051 | id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode, |
| 1052 | kuid_t uid, kgid_t gid) |
| 1053 | { |
| 1054 | int rc = 0; |
| 1055 | int aclflag = CIFS_ACL_DACL; /* default flag to set */ |
| 1056 | __u32 secdesclen = 0; |
| 1057 | struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
| 1058 | struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ |
| 1059 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 1060 | struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| 1061 | struct cifs_tcon *tcon; |
| 1062 | |
| 1063 | if (IS_ERR(tlink)) |
| 1064 | return PTR_ERR(tlink); |
| 1065 | tcon = tlink_tcon(tlink); |
| 1066 | |
| 1067 | cifs_dbg(NOISY, "set ACL from mode for %s\n", path); |
| 1068 | |
| 1069 | /* Get the security descriptor */ |
| 1070 | |
| 1071 | if (tcon->ses->server->ops->get_acl == NULL) { |
| 1072 | cifs_put_tlink(tlink); |
| 1073 | return -EOPNOTSUPP; |
| 1074 | } |
| 1075 | |
| 1076 | pntsd = tcon->ses->server->ops->get_acl(cifs_sb, inode, path, |
| 1077 | &secdesclen); |
| 1078 | if (IS_ERR(pntsd)) { |
| 1079 | rc = PTR_ERR(pntsd); |
| 1080 | cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
| 1081 | cifs_put_tlink(tlink); |
| 1082 | return rc; |
| 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * Add three ACEs for owner, group, everyone getting rid of other ACEs |
| 1087 | * as chmod disables ACEs and set the security descriptor. Allocate |
| 1088 | * memory for the smb header, set security descriptor request security |
| 1089 | * descriptor parameters, and secuirty descriptor itself |
| 1090 | */ |
| 1091 | secdesclen = max_t(u32, secdesclen, DEFAULT_SEC_DESC_LEN); |
| 1092 | pnntsd = kmalloc(secdesclen, GFP_KERNEL); |
| 1093 | if (!pnntsd) { |
| 1094 | kfree(pntsd); |
| 1095 | cifs_put_tlink(tlink); |
| 1096 | return -ENOMEM; |
| 1097 | } |
| 1098 | |
| 1099 | rc = build_sec_desc(pntsd, pnntsd, secdesclen, nmode, uid, gid, |
| 1100 | &aclflag); |
| 1101 | |
| 1102 | cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc); |
| 1103 | |
| 1104 | if (tcon->ses->server->ops->set_acl == NULL) |
| 1105 | rc = -EOPNOTSUPP; |
| 1106 | |
| 1107 | if (!rc) { |
| 1108 | /* Set the security descriptor */ |
| 1109 | rc = tcon->ses->server->ops->set_acl(pnntsd, secdesclen, inode, |
| 1110 | path, aclflag); |
| 1111 | cifs_dbg(NOISY, "set_cifs_acl rc: %d\n", rc); |
| 1112 | } |
| 1113 | cifs_put_tlink(tlink); |
| 1114 | |
| 1115 | kfree(pnntsd); |
| 1116 | kfree(pntsd); |
| 1117 | return rc; |
| 1118 | } |