1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2020, Microsoft Corporation. 4 * 5 * Author(s): Steve French <stfrench@microsoft.com> 6 * David Howells <dhowells@redhat.com> 7 */ 8 9 /* 10 #include <linux/module.h> 11 #include <linux/nsproxy.h> 12 #include <linux/slab.h> 13 #include <linux/magic.h> 14 #include <linux/security.h> 15 #include <net/net_namespace.h> 16 #ifdef CONFIG_CIFS_DFS_UPCALL 17 #include "dfs_cache.h" 18 #endif 19 */ 20 21 #include <linux/ctype.h> 22 #include <linux/fs_context.h> 23 #include <linux/fs_parser.h> 24 #include <linux/fs.h> 25 #include <linux/mount.h> 26 #include <linux/parser.h> 27 #include <linux/utsname.h> 28 #include "cifsfs.h" 29 #include "cifspdu.h" 30 #include "cifsglob.h" 31 #include "cifsproto.h" 32 #include "cifs_unicode.h" 33 #include "cifs_debug.h" 34 #include "cifs_fs_sb.h" 35 #include "ntlmssp.h" 36 #include "nterr.h" 37 #include "rfc1002pdu.h" 38 #include "fs_context.h" 39 40 static DEFINE_MUTEX(cifs_mount_mutex); 41 42 static const match_table_t cifs_smb_version_tokens = { 43 { Smb_1, SMB1_VERSION_STRING }, 44 { Smb_20, SMB20_VERSION_STRING}, 45 { Smb_21, SMB21_VERSION_STRING }, 46 { Smb_30, SMB30_VERSION_STRING }, 47 { Smb_302, SMB302_VERSION_STRING }, 48 { Smb_302, ALT_SMB302_VERSION_STRING }, 49 { Smb_311, SMB311_VERSION_STRING }, 50 { Smb_311, ALT_SMB311_VERSION_STRING }, 51 { Smb_3any, SMB3ANY_VERSION_STRING }, 52 { Smb_default, SMBDEFAULT_VERSION_STRING }, 53 { Smb_version_err, NULL } 54 }; 55 56 static const match_table_t cifs_secflavor_tokens = { 57 { Opt_sec_krb5, "krb5" }, 58 { Opt_sec_krb5i, "krb5i" }, 59 { Opt_sec_krb5p, "krb5p" }, 60 { Opt_sec_ntlmsspi, "ntlmsspi" }, 61 { Opt_sec_ntlmssp, "ntlmssp" }, 62 { Opt_sec_ntlmv2, "nontlm" }, 63 { Opt_sec_ntlmv2, "ntlmv2" }, 64 { Opt_sec_ntlmv2i, "ntlmv2i" }, 65 { Opt_sec_none, "none" }, 66 67 { Opt_sec_err, NULL } 68 }; 69 70 const struct fs_parameter_spec smb3_fs_parameters[] = { 71 /* Mount options that take no arguments */ 72 fsparam_flag_no("user_xattr", Opt_user_xattr), 73 fsparam_flag_no("forceuid", Opt_forceuid), 74 fsparam_flag_no("multichannel", Opt_multichannel), 75 fsparam_flag_no("forcegid", Opt_forcegid), 76 fsparam_flag("noblocksend", Opt_noblocksend), 77 fsparam_flag("noautotune", Opt_noautotune), 78 fsparam_flag("nolease", Opt_nolease), 79 fsparam_flag_no("hard", Opt_hard), 80 fsparam_flag_no("soft", Opt_soft), 81 fsparam_flag_no("perm", Opt_perm), 82 fsparam_flag("nodelete", Opt_nodelete), 83 fsparam_flag_no("mapposix", Opt_mapposix), 84 fsparam_flag("mapchars", Opt_mapchars), 85 fsparam_flag("nomapchars", Opt_nomapchars), 86 fsparam_flag_no("sfu", Opt_sfu), 87 fsparam_flag("nodfs", Opt_nodfs), 88 fsparam_flag_no("posixpaths", Opt_posixpaths), 89 fsparam_flag_no("unix", Opt_unix), 90 fsparam_flag_no("linux", Opt_unix), 91 fsparam_flag_no("posix", Opt_unix), 92 fsparam_flag("nocase", Opt_nocase), 93 fsparam_flag("ignorecase", Opt_nocase), 94 fsparam_flag_no("brl", Opt_brl), 95 fsparam_flag_no("handlecache", Opt_handlecache), 96 fsparam_flag("forcemandatorylock", Opt_forcemandatorylock), 97 fsparam_flag("forcemand", Opt_forcemandatorylock), 98 fsparam_flag("setuidfromacl", Opt_setuidfromacl), 99 fsparam_flag("idsfromsid", Opt_setuidfromacl), 100 fsparam_flag_no("setuids", Opt_setuids), 101 fsparam_flag_no("dynperm", Opt_dynperm), 102 fsparam_flag_no("intr", Opt_intr), 103 fsparam_flag_no("strictsync", Opt_strictsync), 104 fsparam_flag_no("serverino", Opt_serverino), 105 fsparam_flag("rwpidforward", Opt_rwpidforward), 106 fsparam_flag("cifsacl", Opt_cifsacl), 107 fsparam_flag_no("acl", Opt_acl), 108 fsparam_flag("locallease", Opt_locallease), 109 fsparam_flag("sign", Opt_sign), 110 fsparam_flag("ignore_signature", Opt_ignore_signature), 111 fsparam_flag("signloosely", Opt_ignore_signature), 112 fsparam_flag("seal", Opt_seal), 113 fsparam_flag("noac", Opt_noac), 114 fsparam_flag("fsc", Opt_fsc), 115 fsparam_flag("mfsymlinks", Opt_mfsymlinks), 116 fsparam_flag("multiuser", Opt_multiuser), 117 fsparam_flag("sloppy", Opt_sloppy), 118 fsparam_flag("nosharesock", Opt_nosharesock), 119 fsparam_flag_no("persistenthandles", Opt_persistent), 120 fsparam_flag_no("resilienthandles", Opt_resilient), 121 fsparam_flag_no("tcpnodelay", Opt_tcp_nodelay), 122 fsparam_flag("nosparse", Opt_nosparse), 123 fsparam_flag("domainauto", Opt_domainauto), 124 fsparam_flag("rdma", Opt_rdma), 125 fsparam_flag("modesid", Opt_modesid), 126 fsparam_flag("modefromsid", Opt_modesid), 127 fsparam_flag("rootfs", Opt_rootfs), 128 fsparam_flag("compress", Opt_compress), 129 fsparam_flag("witness", Opt_witness), 130 131 /* Mount options which take numeric value */ 132 fsparam_u32("backupuid", Opt_backupuid), 133 fsparam_u32("backupgid", Opt_backupgid), 134 fsparam_u32("uid", Opt_uid), 135 fsparam_u32("cruid", Opt_cruid), 136 fsparam_u32("gid", Opt_gid), 137 fsparam_u32("file_mode", Opt_file_mode), 138 fsparam_u32("dirmode", Opt_dirmode), 139 fsparam_u32("dir_mode", Opt_dirmode), 140 fsparam_u32("port", Opt_port), 141 fsparam_u32("min_enc_offload", Opt_min_enc_offload), 142 fsparam_u32("esize", Opt_min_enc_offload), 143 fsparam_u32("bsize", Opt_blocksize), 144 fsparam_u32("rasize", Opt_rasize), 145 fsparam_u32("rsize", Opt_rsize), 146 fsparam_u32("wsize", Opt_wsize), 147 fsparam_u32("actimeo", Opt_actimeo), 148 fsparam_u32("acdirmax", Opt_acdirmax), 149 fsparam_u32("acregmax", Opt_acregmax), 150 fsparam_u32("closetimeo", Opt_closetimeo), 151 fsparam_u32("echo_interval", Opt_echo_interval), 152 fsparam_u32("max_credits", Opt_max_credits), 153 fsparam_u32("max_cached_dirs", Opt_max_cached_dirs), 154 fsparam_u32("handletimeout", Opt_handletimeout), 155 fsparam_u64("snapshot", Opt_snapshot), 156 fsparam_u32("max_channels", Opt_max_channels), 157 158 /* Mount options which take string value */ 159 fsparam_string("source", Opt_source), 160 fsparam_string("user", Opt_user), 161 fsparam_string("username", Opt_user), 162 fsparam_string("pass", Opt_pass), 163 fsparam_string("password", Opt_pass), 164 fsparam_string("ip", Opt_ip), 165 fsparam_string("addr", Opt_ip), 166 fsparam_string("domain", Opt_domain), 167 fsparam_string("dom", Opt_domain), 168 fsparam_string("srcaddr", Opt_srcaddr), 169 fsparam_string("iocharset", Opt_iocharset), 170 fsparam_string("netbiosname", Opt_netbiosname), 171 fsparam_string("servern", Opt_servern), 172 fsparam_string("ver", Opt_ver), 173 fsparam_string("vers", Opt_vers), 174 fsparam_string("sec", Opt_sec), 175 fsparam_string("cache", Opt_cache), 176 177 /* Arguments that should be ignored */ 178 fsparam_flag("guest", Opt_ignore), 179 fsparam_flag("noatime", Opt_ignore), 180 fsparam_flag("relatime", Opt_ignore), 181 fsparam_flag("_netdev", Opt_ignore), 182 fsparam_flag_no("suid", Opt_ignore), 183 fsparam_flag_no("exec", Opt_ignore), 184 fsparam_flag_no("dev", Opt_ignore), 185 fsparam_flag_no("mand", Opt_ignore), 186 fsparam_flag_no("auto", Opt_ignore), 187 fsparam_string("cred", Opt_ignore), 188 fsparam_string("credentials", Opt_ignore), 189 /* 190 * UNC and prefixpath is now extracted from Opt_source 191 * in the new mount API so we can just ignore them going forward. 192 */ 193 fsparam_string("unc", Opt_ignore), 194 fsparam_string("prefixpath", Opt_ignore), 195 {} 196 }; 197 198 static int 199 cifs_parse_security_flavors(struct fs_context *fc, char *value, struct smb3_fs_context *ctx) 200 { 201 202 substring_t args[MAX_OPT_ARGS]; 203 204 /* 205 * With mount options, the last one should win. Reset any existing 206 * settings back to default. 207 */ 208 ctx->sectype = Unspecified; 209 ctx->sign = false; 210 211 switch (match_token(value, cifs_secflavor_tokens, args)) { 212 case Opt_sec_krb5p: 213 cifs_errorf(fc, "sec=krb5p is not supported!\n"); 214 return 1; 215 case Opt_sec_krb5i: 216 ctx->sign = true; 217 fallthrough; 218 case Opt_sec_krb5: 219 ctx->sectype = Kerberos; 220 break; 221 case Opt_sec_ntlmsspi: 222 ctx->sign = true; 223 fallthrough; 224 case Opt_sec_ntlmssp: 225 ctx->sectype = RawNTLMSSP; 226 break; 227 case Opt_sec_ntlmv2i: 228 ctx->sign = true; 229 fallthrough; 230 case Opt_sec_ntlmv2: 231 ctx->sectype = NTLMv2; 232 break; 233 case Opt_sec_none: 234 ctx->nullauth = 1; 235 kfree(ctx->username); 236 ctx->username = NULL; 237 break; 238 default: 239 cifs_errorf(fc, "bad security option: %s\n", value); 240 return 1; 241 } 242 243 return 0; 244 } 245 246 static const match_table_t cifs_cacheflavor_tokens = { 247 { Opt_cache_loose, "loose" }, 248 { Opt_cache_strict, "strict" }, 249 { Opt_cache_none, "none" }, 250 { Opt_cache_ro, "ro" }, 251 { Opt_cache_rw, "singleclient" }, 252 { Opt_cache_err, NULL } 253 }; 254 255 static int 256 cifs_parse_cache_flavor(struct fs_context *fc, char *value, struct smb3_fs_context *ctx) 257 { 258 substring_t args[MAX_OPT_ARGS]; 259 260 switch (match_token(value, cifs_cacheflavor_tokens, args)) { 261 case Opt_cache_loose: 262 ctx->direct_io = false; 263 ctx->strict_io = false; 264 ctx->cache_ro = false; 265 ctx->cache_rw = false; 266 break; 267 case Opt_cache_strict: 268 ctx->direct_io = false; 269 ctx->strict_io = true; 270 ctx->cache_ro = false; 271 ctx->cache_rw = false; 272 break; 273 case Opt_cache_none: 274 ctx->direct_io = true; 275 ctx->strict_io = false; 276 ctx->cache_ro = false; 277 ctx->cache_rw = false; 278 break; 279 case Opt_cache_ro: 280 ctx->direct_io = false; 281 ctx->strict_io = false; 282 ctx->cache_ro = true; 283 ctx->cache_rw = false; 284 break; 285 case Opt_cache_rw: 286 ctx->direct_io = false; 287 ctx->strict_io = false; 288 ctx->cache_ro = false; 289 ctx->cache_rw = true; 290 break; 291 default: 292 cifs_errorf(fc, "bad cache= option: %s\n", value); 293 return 1; 294 } 295 return 0; 296 } 297 298 #define DUP_CTX_STR(field) \ 299 do { \ 300 if (ctx->field) { \ 301 new_ctx->field = kstrdup(ctx->field, GFP_ATOMIC); \ 302 if (new_ctx->field == NULL) { \ 303 smb3_cleanup_fs_context_contents(new_ctx); \ 304 return -ENOMEM; \ 305 } \ 306 } \ 307 } while (0) 308 309 int 310 smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx) 311 { 312 memcpy(new_ctx, ctx, sizeof(*ctx)); 313 new_ctx->prepath = NULL; 314 new_ctx->nodename = NULL; 315 new_ctx->username = NULL; 316 new_ctx->password = NULL; 317 new_ctx->server_hostname = NULL; 318 new_ctx->domainname = NULL; 319 new_ctx->UNC = NULL; 320 new_ctx->source = NULL; 321 new_ctx->iocharset = NULL; 322 new_ctx->leaf_fullpath = NULL; 323 /* 324 * Make sure to stay in sync with smb3_cleanup_fs_context_contents() 325 */ 326 DUP_CTX_STR(prepath); 327 DUP_CTX_STR(username); 328 DUP_CTX_STR(password); 329 DUP_CTX_STR(server_hostname); 330 DUP_CTX_STR(UNC); 331 DUP_CTX_STR(source); 332 DUP_CTX_STR(domainname); 333 DUP_CTX_STR(nodename); 334 DUP_CTX_STR(iocharset); 335 DUP_CTX_STR(leaf_fullpath); 336 337 return 0; 338 } 339 340 static int 341 cifs_parse_smb_version(struct fs_context *fc, char *value, struct smb3_fs_context *ctx, bool is_smb3) 342 { 343 substring_t args[MAX_OPT_ARGS]; 344 345 switch (match_token(value, cifs_smb_version_tokens, args)) { 346 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 347 case Smb_1: 348 if (disable_legacy_dialects) { 349 cifs_errorf(fc, "mount with legacy dialect disabled\n"); 350 return 1; 351 } 352 if (is_smb3) { 353 cifs_errorf(fc, "vers=1.0 (cifs) not permitted when mounting with smb3\n"); 354 return 1; 355 } 356 cifs_errorf(fc, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n"); 357 ctx->ops = &smb1_operations; 358 ctx->vals = &smb1_values; 359 break; 360 case Smb_20: 361 if (disable_legacy_dialects) { 362 cifs_errorf(fc, "mount with legacy dialect disabled\n"); 363 return 1; 364 } 365 if (is_smb3) { 366 cifs_errorf(fc, "vers=2.0 not permitted when mounting with smb3\n"); 367 return 1; 368 } 369 ctx->ops = &smb20_operations; 370 ctx->vals = &smb20_values; 371 break; 372 #else 373 case Smb_1: 374 cifs_errorf(fc, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n"); 375 return 1; 376 case Smb_20: 377 cifs_errorf(fc, "vers=2.0 mount not permitted when legacy dialects disabled\n"); 378 return 1; 379 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 380 case Smb_21: 381 ctx->ops = &smb21_operations; 382 ctx->vals = &smb21_values; 383 break; 384 case Smb_30: 385 ctx->ops = &smb30_operations; 386 ctx->vals = &smb30_values; 387 break; 388 case Smb_302: 389 ctx->ops = &smb30_operations; /* currently identical with 3.0 */ 390 ctx->vals = &smb302_values; 391 break; 392 case Smb_311: 393 ctx->ops = &smb311_operations; 394 ctx->vals = &smb311_values; 395 break; 396 case Smb_3any: 397 ctx->ops = &smb30_operations; /* currently identical with 3.0 */ 398 ctx->vals = &smb3any_values; 399 break; 400 case Smb_default: 401 ctx->ops = &smb30_operations; 402 ctx->vals = &smbdefault_values; 403 break; 404 default: 405 cifs_errorf(fc, "Unknown vers= option specified: %s\n", value); 406 return 1; 407 } 408 return 0; 409 } 410 411 int smb3_parse_opt(const char *options, const char *key, char **val) 412 { 413 int rc = -ENOENT; 414 char *opts, *orig, *p; 415 416 orig = opts = kstrdup(options, GFP_KERNEL); 417 if (!opts) 418 return -ENOMEM; 419 420 while ((p = strsep(&opts, ","))) { 421 char *nval; 422 423 if (!*p) 424 continue; 425 if (strncasecmp(p, key, strlen(key))) 426 continue; 427 nval = strchr(p, '='); 428 if (nval) { 429 if (nval == p) 430 continue; 431 *nval++ = 0; 432 *val = kstrdup(nval, GFP_KERNEL); 433 rc = !*val ? -ENOMEM : 0; 434 goto out; 435 } 436 } 437 out: 438 kfree(orig); 439 return rc; 440 } 441 442 /* 443 * Remove duplicate path delimiters. Windows is supposed to do that 444 * but there are some bugs that prevent rename from working if there are 445 * multiple delimiters. 446 * 447 * Return a sanitized duplicate of @path or NULL for empty prefix paths. 448 * Otherwise, return ERR_PTR. 449 * 450 * @gfp indicates the GFP_* flags for kstrdup. 451 * The caller is responsible for freeing the original. 452 */ 453 #define IS_DELIM(c) ((c) == '/' || (c) == '\\') 454 char *cifs_sanitize_prepath(char *prepath, gfp_t gfp) 455 { 456 char *cursor1 = prepath, *cursor2 = prepath; 457 char *s; 458 459 /* skip all prepended delimiters */ 460 while (IS_DELIM(*cursor1)) 461 cursor1++; 462 463 /* copy the first letter */ 464 *cursor2 = *cursor1; 465 466 /* copy the remainder... */ 467 while (*(cursor1++)) { 468 /* ... skipping all duplicated delimiters */ 469 if (IS_DELIM(*cursor1) && IS_DELIM(*cursor2)) 470 continue; 471 *(++cursor2) = *cursor1; 472 } 473 474 /* if the last character is a delimiter, skip it */ 475 if (IS_DELIM(*(cursor2 - 1))) 476 cursor2--; 477 478 *cursor2 = '\0'; 479 if (!*prepath) 480 return NULL; 481 s = kstrdup(prepath, gfp); 482 if (!s) 483 return ERR_PTR(-ENOMEM); 484 return s; 485 } 486 487 /* 488 * Return full path based on the values of @ctx->{UNC,prepath}. 489 * 490 * It is assumed that both values were already parsed by smb3_parse_devname(). 491 */ 492 char *smb3_fs_context_fullpath(const struct smb3_fs_context *ctx, char dirsep) 493 { 494 size_t ulen, plen; 495 char *s; 496 497 ulen = strlen(ctx->UNC); 498 plen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0; 499 500 s = kmalloc(ulen + plen + 1, GFP_KERNEL); 501 if (!s) 502 return ERR_PTR(-ENOMEM); 503 memcpy(s, ctx->UNC, ulen); 504 if (plen) { 505 s[ulen] = dirsep; 506 memcpy(s + ulen + 1, ctx->prepath, plen); 507 } 508 s[ulen + plen] = '\0'; 509 convert_delimiter(s, dirsep); 510 return s; 511 } 512 513 /* 514 * Parse a devname into substrings and populate the ctx->UNC and ctx->prepath 515 * fields with the result. Returns 0 on success and an error otherwise 516 * (e.g. ENOMEM or EINVAL) 517 */ 518 int 519 smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx) 520 { 521 char *pos; 522 const char *delims = "/\\"; 523 size_t len; 524 int rc; 525 526 if (unlikely(!devname || !*devname)) { 527 cifs_dbg(VFS, "Device name not specified\n"); 528 return -EINVAL; 529 } 530 531 /* make sure we have a valid UNC double delimiter prefix */ 532 len = strspn(devname, delims); 533 if (len != 2) 534 return -EINVAL; 535 536 /* find delimiter between host and sharename */ 537 pos = strpbrk(devname + 2, delims); 538 if (!pos) 539 return -EINVAL; 540 541 /* record the server hostname */ 542 kfree(ctx->server_hostname); 543 ctx->server_hostname = kstrndup(devname + 2, pos - devname - 2, GFP_KERNEL); 544 if (!ctx->server_hostname) 545 return -ENOMEM; 546 547 /* skip past delimiter */ 548 ++pos; 549 550 /* now go until next delimiter or end of string */ 551 len = strcspn(pos, delims); 552 if (!len) 553 return -EINVAL; 554 555 /* move "pos" up to delimiter or NULL */ 556 pos += len; 557 kfree(ctx->UNC); 558 ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL); 559 if (!ctx->UNC) 560 return -ENOMEM; 561 562 convert_delimiter(ctx->UNC, '\\'); 563 564 /* skip any delimiter */ 565 if (*pos == '/' || *pos == '\\') 566 pos++; 567 568 kfree(ctx->prepath); 569 ctx->prepath = NULL; 570 571 /* If pos is NULL then no prepath */ 572 if (!*pos) 573 return 0; 574 575 ctx->prepath = cifs_sanitize_prepath(pos, GFP_KERNEL); 576 if (IS_ERR(ctx->prepath)) { 577 rc = PTR_ERR(ctx->prepath); 578 ctx->prepath = NULL; 579 return rc; 580 } 581 582 return 0; 583 } 584 585 static void smb3_fs_context_free(struct fs_context *fc); 586 static int smb3_fs_context_parse_param(struct fs_context *fc, 587 struct fs_parameter *param); 588 static int smb3_fs_context_parse_monolithic(struct fs_context *fc, 589 void *data); 590 static int smb3_get_tree(struct fs_context *fc); 591 static int smb3_reconfigure(struct fs_context *fc); 592 593 static const struct fs_context_operations smb3_fs_context_ops = { 594 .free = smb3_fs_context_free, 595 .parse_param = smb3_fs_context_parse_param, 596 .parse_monolithic = smb3_fs_context_parse_monolithic, 597 .get_tree = smb3_get_tree, 598 .reconfigure = smb3_reconfigure, 599 }; 600 601 /* 602 * Parse a monolithic block of data from sys_mount(). 603 * smb3_fs_context_parse_monolithic - Parse key[=val][,key[=val]]* mount data 604 * @ctx: The superblock configuration to fill in. 605 * @data: The data to parse 606 * 607 * Parse a blob of data that's in key[=val][,key[=val]]* form. This can be 608 * called from the ->monolithic_mount_data() fs_context operation. 609 * 610 * Returns 0 on success or the error returned by the ->parse_option() fs_context 611 * operation on failure. 612 */ 613 static int smb3_fs_context_parse_monolithic(struct fs_context *fc, 614 void *data) 615 { 616 char *options = data, *key; 617 int ret = 0; 618 619 if (!options) 620 return 0; 621 622 ret = security_sb_eat_lsm_opts(options, &fc->security); 623 if (ret) 624 return ret; 625 626 /* BB Need to add support for sep= here TBD */ 627 while ((key = strsep(&options, ",")) != NULL) { 628 size_t len; 629 char *value; 630 631 if (*key == 0) 632 break; 633 634 /* Check if following character is the deliminator If yes, 635 * we have encountered a double deliminator reset the NULL 636 * character to the deliminator 637 */ 638 while (options && options[0] == ',') { 639 len = strlen(key); 640 strcpy(key + len, options); 641 options = strchr(options, ','); 642 if (options) 643 *options++ = 0; 644 } 645 646 647 len = 0; 648 value = strchr(key, '='); 649 if (value) { 650 if (value == key) 651 continue; 652 *value++ = 0; 653 len = strlen(value); 654 } 655 656 ret = vfs_parse_fs_string(fc, key, value, len); 657 if (ret < 0) 658 break; 659 } 660 661 return ret; 662 } 663 664 /* 665 * Validate the preparsed information in the config. 666 */ 667 static int smb3_fs_context_validate(struct fs_context *fc) 668 { 669 struct smb3_fs_context *ctx = smb3_fc2context(fc); 670 671 if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) { 672 cifs_errorf(fc, "SMB Direct requires Version >=3.0\n"); 673 return -EOPNOTSUPP; 674 } 675 676 #ifndef CONFIG_KEYS 677 /* Muliuser mounts require CONFIG_KEYS support */ 678 if (ctx->multiuser) { 679 cifs_errorf(fc, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n"); 680 return -1; 681 } 682 #endif 683 684 if (ctx->got_version == false) 685 pr_warn_once("No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 (or even SMB3 or SMB2.1) specify vers=1.0 on mount.\n"); 686 687 688 if (!ctx->UNC) { 689 cifs_errorf(fc, "CIFS mount error: No usable UNC path provided in device string!\n"); 690 return -1; 691 } 692 693 /* make sure UNC has a share name */ 694 if (strlen(ctx->UNC) < 3 || !strchr(ctx->UNC + 3, '\\')) { 695 cifs_errorf(fc, "Malformed UNC. Unable to find share name.\n"); 696 return -ENOENT; 697 } 698 699 if (!ctx->got_ip) { 700 int len; 701 const char *slash; 702 703 /* No ip= option specified? Try to get it from UNC */ 704 /* Use the address part of the UNC. */ 705 slash = strchr(&ctx->UNC[2], '\\'); 706 len = slash - &ctx->UNC[2]; 707 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr, 708 &ctx->UNC[2], len)) { 709 pr_err("Unable to determine destination address\n"); 710 return -EHOSTUNREACH; 711 } 712 } 713 714 /* set the port that we got earlier */ 715 cifs_set_port((struct sockaddr *)&ctx->dstaddr, ctx->port); 716 717 if (ctx->override_uid && !ctx->uid_specified) { 718 ctx->override_uid = 0; 719 pr_notice("ignoring forceuid mount option specified with no uid= option\n"); 720 } 721 722 if (ctx->override_gid && !ctx->gid_specified) { 723 ctx->override_gid = 0; 724 pr_notice("ignoring forcegid mount option specified with no gid= option\n"); 725 } 726 727 return 0; 728 } 729 730 static int smb3_get_tree_common(struct fs_context *fc) 731 { 732 struct smb3_fs_context *ctx = smb3_fc2context(fc); 733 struct dentry *root; 734 int rc = 0; 735 736 root = cifs_smb3_do_mount(fc->fs_type, 0, ctx); 737 if (IS_ERR(root)) 738 return PTR_ERR(root); 739 740 fc->root = root; 741 742 return rc; 743 } 744 745 /* 746 * Create an SMB3 superblock from the parameters passed. 747 */ 748 static int smb3_get_tree(struct fs_context *fc) 749 { 750 int err = smb3_fs_context_validate(fc); 751 int ret; 752 753 if (err) 754 return err; 755 mutex_lock(&cifs_mount_mutex); 756 ret = smb3_get_tree_common(fc); 757 mutex_unlock(&cifs_mount_mutex); 758 return ret; 759 } 760 761 static void smb3_fs_context_free(struct fs_context *fc) 762 { 763 struct smb3_fs_context *ctx = smb3_fc2context(fc); 764 765 smb3_cleanup_fs_context(ctx); 766 } 767 768 /* 769 * Compare the old and new proposed context during reconfigure 770 * and check if the changes are compatible. 771 */ 772 static int smb3_verify_reconfigure_ctx(struct fs_context *fc, 773 struct smb3_fs_context *new_ctx, 774 struct smb3_fs_context *old_ctx) 775 { 776 if (new_ctx->posix_paths != old_ctx->posix_paths) { 777 cifs_errorf(fc, "can not change posixpaths during remount\n"); 778 return -EINVAL; 779 } 780 if (new_ctx->sectype != old_ctx->sectype) { 781 cifs_errorf(fc, "can not change sec during remount\n"); 782 return -EINVAL; 783 } 784 if (new_ctx->multiuser != old_ctx->multiuser) { 785 cifs_errorf(fc, "can not change multiuser during remount\n"); 786 return -EINVAL; 787 } 788 if (new_ctx->UNC && 789 (!old_ctx->UNC || strcmp(new_ctx->UNC, old_ctx->UNC))) { 790 cifs_errorf(fc, "can not change UNC during remount\n"); 791 return -EINVAL; 792 } 793 if (new_ctx->username && 794 (!old_ctx->username || strcmp(new_ctx->username, old_ctx->username))) { 795 cifs_errorf(fc, "can not change username during remount\n"); 796 return -EINVAL; 797 } 798 if (new_ctx->password && 799 (!old_ctx->password || strcmp(new_ctx->password, old_ctx->password))) { 800 cifs_errorf(fc, "can not change password during remount\n"); 801 return -EINVAL; 802 } 803 if (new_ctx->domainname && 804 (!old_ctx->domainname || strcmp(new_ctx->domainname, old_ctx->domainname))) { 805 cifs_errorf(fc, "can not change domainname during remount\n"); 806 return -EINVAL; 807 } 808 if (strcmp(new_ctx->workstation_name, old_ctx->workstation_name)) { 809 cifs_errorf(fc, "can not change workstation_name during remount\n"); 810 return -EINVAL; 811 } 812 if (new_ctx->nodename && 813 (!old_ctx->nodename || strcmp(new_ctx->nodename, old_ctx->nodename))) { 814 cifs_errorf(fc, "can not change nodename during remount\n"); 815 return -EINVAL; 816 } 817 if (new_ctx->iocharset && 818 (!old_ctx->iocharset || strcmp(new_ctx->iocharset, old_ctx->iocharset))) { 819 cifs_errorf(fc, "can not change iocharset during remount\n"); 820 return -EINVAL; 821 } 822 823 return 0; 824 } 825 826 #define STEAL_STRING(cifs_sb, ctx, field) \ 827 do { \ 828 kfree(ctx->field); \ 829 ctx->field = cifs_sb->ctx->field; \ 830 cifs_sb->ctx->field = NULL; \ 831 } while (0) 832 833 #define STEAL_STRING_SENSITIVE(cifs_sb, ctx, field) \ 834 do { \ 835 kfree_sensitive(ctx->field); \ 836 ctx->field = cifs_sb->ctx->field; \ 837 cifs_sb->ctx->field = NULL; \ 838 } while (0) 839 840 static int smb3_reconfigure(struct fs_context *fc) 841 { 842 struct smb3_fs_context *ctx = smb3_fc2context(fc); 843 struct dentry *root = fc->root; 844 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb); 845 int rc; 846 847 rc = smb3_verify_reconfigure_ctx(fc, ctx, cifs_sb->ctx); 848 if (rc) 849 return rc; 850 851 /* 852 * We can not change UNC/username/password/domainname/ 853 * workstation_name/nodename/iocharset 854 * during reconnect so ignore what we have in the new context and 855 * just use what we already have in cifs_sb->ctx. 856 */ 857 STEAL_STRING(cifs_sb, ctx, UNC); 858 STEAL_STRING(cifs_sb, ctx, source); 859 STEAL_STRING(cifs_sb, ctx, username); 860 STEAL_STRING_SENSITIVE(cifs_sb, ctx, password); 861 STEAL_STRING(cifs_sb, ctx, domainname); 862 STEAL_STRING(cifs_sb, ctx, nodename); 863 STEAL_STRING(cifs_sb, ctx, iocharset); 864 865 /* if rsize or wsize not passed in on remount, use previous values */ 866 if (ctx->rsize == 0) 867 ctx->rsize = cifs_sb->ctx->rsize; 868 if (ctx->wsize == 0) 869 ctx->wsize = cifs_sb->ctx->wsize; 870 871 872 smb3_cleanup_fs_context_contents(cifs_sb->ctx); 873 rc = smb3_fs_context_dup(cifs_sb->ctx, ctx); 874 smb3_update_mnt_flags(cifs_sb); 875 #ifdef CONFIG_CIFS_DFS_UPCALL 876 if (!rc) 877 rc = dfs_cache_remount_fs(cifs_sb); 878 #endif 879 880 return rc; 881 } 882 883 static int smb3_fs_context_parse_param(struct fs_context *fc, 884 struct fs_parameter *param) 885 { 886 struct fs_parse_result result; 887 struct smb3_fs_context *ctx = smb3_fc2context(fc); 888 int i, opt; 889 bool is_smb3 = !strcmp(fc->fs_type->name, "smb3"); 890 bool skip_parsing = false; 891 kuid_t uid; 892 kgid_t gid; 893 894 cifs_dbg(FYI, "CIFS: parsing cifs mount option '%s'\n", param->key); 895 896 /* 897 * fs_parse can not handle string options with an empty value so 898 * we will need special handling of them. 899 */ 900 if (param->type == fs_value_is_string && param->string[0] == 0) { 901 if (!strcmp("pass", param->key) || !strcmp("password", param->key)) { 902 skip_parsing = true; 903 opt = Opt_pass; 904 } else if (!strcmp("user", param->key) || !strcmp("username", param->key)) { 905 skip_parsing = true; 906 opt = Opt_user; 907 } 908 } 909 910 if (!skip_parsing) { 911 opt = fs_parse(fc, smb3_fs_parameters, param, &result); 912 if (opt < 0) 913 return ctx->sloppy ? 1 : opt; 914 } 915 916 switch (opt) { 917 case Opt_compress: 918 ctx->compression = UNKNOWN_TYPE; 919 cifs_dbg(VFS, 920 "SMB3 compression support is experimental\n"); 921 break; 922 case Opt_nodfs: 923 ctx->nodfs = 1; 924 break; 925 case Opt_hard: 926 if (result.negated) { 927 if (ctx->retry == 1) 928 cifs_dbg(VFS, "conflicting hard vs. soft mount options\n"); 929 ctx->retry = 0; 930 } else 931 ctx->retry = 1; 932 break; 933 case Opt_soft: 934 if (result.negated) 935 ctx->retry = 1; 936 else { 937 if (ctx->retry == 1) 938 cifs_dbg(VFS, "conflicting hard vs soft mount options\n"); 939 ctx->retry = 0; 940 } 941 break; 942 case Opt_mapposix: 943 if (result.negated) 944 ctx->remap = false; 945 else { 946 ctx->remap = true; 947 ctx->sfu_remap = false; /* disable SFU mapping */ 948 } 949 break; 950 case Opt_mapchars: 951 if (result.negated) 952 ctx->sfu_remap = false; 953 else { 954 ctx->sfu_remap = true; 955 ctx->remap = false; /* disable SFM (mapposix) mapping */ 956 } 957 break; 958 case Opt_user_xattr: 959 if (result.negated) 960 ctx->no_xattr = 1; 961 else 962 ctx->no_xattr = 0; 963 break; 964 case Opt_forceuid: 965 if (result.negated) 966 ctx->override_uid = 0; 967 else 968 ctx->override_uid = 1; 969 break; 970 case Opt_forcegid: 971 if (result.negated) 972 ctx->override_gid = 0; 973 else 974 ctx->override_gid = 1; 975 break; 976 case Opt_perm: 977 if (result.negated) 978 ctx->noperm = 1; 979 else 980 ctx->noperm = 0; 981 break; 982 case Opt_dynperm: 983 if (result.negated) 984 ctx->dynperm = 0; 985 else 986 ctx->dynperm = 1; 987 break; 988 case Opt_sfu: 989 if (result.negated) 990 ctx->sfu_emul = 0; 991 else 992 ctx->sfu_emul = 1; 993 break; 994 case Opt_noblocksend: 995 ctx->noblocksnd = 1; 996 break; 997 case Opt_noautotune: 998 ctx->noautotune = 1; 999 break; 1000 case Opt_nolease: 1001 ctx->no_lease = 1; 1002 break; 1003 case Opt_nosparse: 1004 ctx->no_sparse = 1; 1005 break; 1006 case Opt_nodelete: 1007 ctx->nodelete = 1; 1008 break; 1009 case Opt_multichannel: 1010 if (result.negated) { 1011 ctx->multichannel = false; 1012 ctx->max_channels = 1; 1013 } else { 1014 ctx->multichannel = true; 1015 /* if number of channels not specified, default to 2 */ 1016 if (ctx->max_channels < 2) 1017 ctx->max_channels = 2; 1018 } 1019 break; 1020 case Opt_uid: 1021 uid = make_kuid(current_user_ns(), result.uint_32); 1022 if (!uid_valid(uid)) 1023 goto cifs_parse_mount_err; 1024 ctx->linux_uid = uid; 1025 ctx->uid_specified = true; 1026 break; 1027 case Opt_cruid: 1028 uid = make_kuid(current_user_ns(), result.uint_32); 1029 if (!uid_valid(uid)) 1030 goto cifs_parse_mount_err; 1031 ctx->cred_uid = uid; 1032 ctx->cruid_specified = true; 1033 break; 1034 case Opt_backupuid: 1035 uid = make_kuid(current_user_ns(), result.uint_32); 1036 if (!uid_valid(uid)) 1037 goto cifs_parse_mount_err; 1038 ctx->backupuid = uid; 1039 ctx->backupuid_specified = true; 1040 break; 1041 case Opt_backupgid: 1042 gid = make_kgid(current_user_ns(), result.uint_32); 1043 if (!gid_valid(gid)) 1044 goto cifs_parse_mount_err; 1045 ctx->backupgid = gid; 1046 ctx->backupgid_specified = true; 1047 break; 1048 case Opt_gid: 1049 gid = make_kgid(current_user_ns(), result.uint_32); 1050 if (!gid_valid(gid)) 1051 goto cifs_parse_mount_err; 1052 ctx->linux_gid = gid; 1053 ctx->gid_specified = true; 1054 break; 1055 case Opt_port: 1056 ctx->port = result.uint_32; 1057 break; 1058 case Opt_file_mode: 1059 ctx->file_mode = result.uint_32; 1060 break; 1061 case Opt_dirmode: 1062 ctx->dir_mode = result.uint_32; 1063 break; 1064 case Opt_min_enc_offload: 1065 ctx->min_offload = result.uint_32; 1066 break; 1067 case Opt_blocksize: 1068 /* 1069 * inode blocksize realistically should never need to be 1070 * less than 16K or greater than 16M and default is 1MB. 1071 * Note that small inode block sizes (e.g. 64K) can lead 1072 * to very poor performance of common tools like cp and scp 1073 */ 1074 if ((result.uint_32 < CIFS_MAX_MSGSIZE) || 1075 (result.uint_32 > (4 * SMB3_DEFAULT_IOSIZE))) { 1076 cifs_errorf(fc, "%s: Invalid blocksize\n", 1077 __func__); 1078 goto cifs_parse_mount_err; 1079 } 1080 ctx->bsize = result.uint_32; 1081 ctx->got_bsize = true; 1082 break; 1083 case Opt_rasize: 1084 /* 1085 * readahead size realistically should never need to be 1086 * less than 1M (CIFS_DEFAULT_IOSIZE) or greater than 32M 1087 * (perhaps an exception should be considered in the 1088 * for the case of a large number of channels 1089 * when multichannel is negotiated) since that would lead 1090 * to plenty of parallel I/O in flight to the server. 1091 * Note that smaller read ahead sizes would 1092 * hurt performance of common tools like cp and scp 1093 * which often trigger sequential i/o with read ahead 1094 */ 1095 if ((result.uint_32 > (8 * SMB3_DEFAULT_IOSIZE)) || 1096 (result.uint_32 < CIFS_DEFAULT_IOSIZE)) { 1097 cifs_errorf(fc, "%s: Invalid rasize %d vs. %d\n", 1098 __func__, result.uint_32, SMB3_DEFAULT_IOSIZE); 1099 goto cifs_parse_mount_err; 1100 } 1101 ctx->rasize = result.uint_32; 1102 break; 1103 case Opt_rsize: 1104 ctx->rsize = result.uint_32; 1105 ctx->got_rsize = true; 1106 break; 1107 case Opt_wsize: 1108 ctx->wsize = result.uint_32; 1109 ctx->got_wsize = true; 1110 break; 1111 case Opt_acregmax: 1112 ctx->acregmax = HZ * result.uint_32; 1113 if (ctx->acregmax > CIFS_MAX_ACTIMEO) { 1114 cifs_errorf(fc, "acregmax too large\n"); 1115 goto cifs_parse_mount_err; 1116 } 1117 break; 1118 case Opt_acdirmax: 1119 ctx->acdirmax = HZ * result.uint_32; 1120 if (ctx->acdirmax > CIFS_MAX_ACTIMEO) { 1121 cifs_errorf(fc, "acdirmax too large\n"); 1122 goto cifs_parse_mount_err; 1123 } 1124 break; 1125 case Opt_actimeo: 1126 if (HZ * result.uint_32 > CIFS_MAX_ACTIMEO) { 1127 cifs_errorf(fc, "timeout too large\n"); 1128 goto cifs_parse_mount_err; 1129 } 1130 if ((ctx->acdirmax != CIFS_DEF_ACTIMEO) || 1131 (ctx->acregmax != CIFS_DEF_ACTIMEO)) { 1132 cifs_errorf(fc, "actimeo ignored since acregmax or acdirmax specified\n"); 1133 break; 1134 } 1135 ctx->acdirmax = ctx->acregmax = HZ * result.uint_32; 1136 break; 1137 case Opt_closetimeo: 1138 ctx->closetimeo = HZ * result.uint_32; 1139 if (ctx->closetimeo > SMB3_MAX_DCLOSETIMEO) { 1140 cifs_errorf(fc, "closetimeo too large\n"); 1141 goto cifs_parse_mount_err; 1142 } 1143 break; 1144 case Opt_echo_interval: 1145 ctx->echo_interval = result.uint_32; 1146 break; 1147 case Opt_snapshot: 1148 ctx->snapshot_time = result.uint_64; 1149 break; 1150 case Opt_max_credits: 1151 if (result.uint_32 < 20 || result.uint_32 > 60000) { 1152 cifs_errorf(fc, "%s: Invalid max_credits value\n", 1153 __func__); 1154 goto cifs_parse_mount_err; 1155 } 1156 ctx->max_credits = result.uint_32; 1157 break; 1158 case Opt_max_channels: 1159 if (result.uint_32 < 1 || result.uint_32 > CIFS_MAX_CHANNELS) { 1160 cifs_errorf(fc, "%s: Invalid max_channels value, needs to be 1-%d\n", 1161 __func__, CIFS_MAX_CHANNELS); 1162 goto cifs_parse_mount_err; 1163 } 1164 ctx->max_channels = result.uint_32; 1165 /* If more than one channel requested ... they want multichan */ 1166 if (result.uint_32 > 1) 1167 ctx->multichannel = true; 1168 break; 1169 case Opt_max_cached_dirs: 1170 if (result.uint_32 < 1) { 1171 cifs_errorf(fc, "%s: Invalid max_cached_dirs, needs to be 1 or more\n", 1172 __func__); 1173 goto cifs_parse_mount_err; 1174 } 1175 ctx->max_cached_dirs = result.uint_32; 1176 break; 1177 case Opt_handletimeout: 1178 ctx->handle_timeout = result.uint_32; 1179 if (ctx->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) { 1180 cifs_errorf(fc, "Invalid handle cache timeout, longer than 16 minutes\n"); 1181 goto cifs_parse_mount_err; 1182 } 1183 break; 1184 case Opt_source: 1185 kfree(ctx->UNC); 1186 ctx->UNC = NULL; 1187 switch (smb3_parse_devname(param->string, ctx)) { 1188 case 0: 1189 break; 1190 case -ENOMEM: 1191 cifs_errorf(fc, "Unable to allocate memory for devname\n"); 1192 goto cifs_parse_mount_err; 1193 case -EINVAL: 1194 cifs_errorf(fc, "Malformed UNC in devname\n"); 1195 goto cifs_parse_mount_err; 1196 default: 1197 cifs_errorf(fc, "Unknown error parsing devname\n"); 1198 goto cifs_parse_mount_err; 1199 } 1200 ctx->source = smb3_fs_context_fullpath(ctx, '/'); 1201 if (IS_ERR(ctx->source)) { 1202 ctx->source = NULL; 1203 cifs_errorf(fc, "OOM when copying UNC string\n"); 1204 goto cifs_parse_mount_err; 1205 } 1206 fc->source = kstrdup(ctx->source, GFP_KERNEL); 1207 if (fc->source == NULL) { 1208 cifs_errorf(fc, "OOM when copying UNC string\n"); 1209 goto cifs_parse_mount_err; 1210 } 1211 break; 1212 case Opt_user: 1213 kfree(ctx->username); 1214 ctx->username = NULL; 1215 if (ctx->nullauth) 1216 break; 1217 if (strlen(param->string) == 0) { 1218 /* null user, ie. anonymous authentication */ 1219 ctx->nullauth = 1; 1220 break; 1221 } 1222 1223 if (strnlen(param->string, CIFS_MAX_USERNAME_LEN) > 1224 CIFS_MAX_USERNAME_LEN) { 1225 pr_warn("username too long\n"); 1226 goto cifs_parse_mount_err; 1227 } 1228 ctx->username = kstrdup(param->string, GFP_KERNEL); 1229 if (ctx->username == NULL) { 1230 cifs_errorf(fc, "OOM when copying username string\n"); 1231 goto cifs_parse_mount_err; 1232 } 1233 break; 1234 case Opt_pass: 1235 kfree_sensitive(ctx->password); 1236 ctx->password = NULL; 1237 if (strlen(param->string) == 0) 1238 break; 1239 1240 ctx->password = kstrdup(param->string, GFP_KERNEL); 1241 if (ctx->password == NULL) { 1242 cifs_errorf(fc, "OOM when copying password string\n"); 1243 goto cifs_parse_mount_err; 1244 } 1245 break; 1246 case Opt_ip: 1247 if (strlen(param->string) == 0) { 1248 ctx->got_ip = false; 1249 break; 1250 } 1251 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr, 1252 param->string, 1253 strlen(param->string))) { 1254 pr_err("bad ip= option (%s)\n", param->string); 1255 goto cifs_parse_mount_err; 1256 } 1257 ctx->got_ip = true; 1258 break; 1259 case Opt_domain: 1260 if (strnlen(param->string, CIFS_MAX_DOMAINNAME_LEN) 1261 == CIFS_MAX_DOMAINNAME_LEN) { 1262 pr_warn("domain name too long\n"); 1263 goto cifs_parse_mount_err; 1264 } 1265 1266 kfree(ctx->domainname); 1267 ctx->domainname = kstrdup(param->string, GFP_KERNEL); 1268 if (ctx->domainname == NULL) { 1269 cifs_errorf(fc, "OOM when copying domainname string\n"); 1270 goto cifs_parse_mount_err; 1271 } 1272 cifs_dbg(FYI, "Domain name set\n"); 1273 break; 1274 case Opt_srcaddr: 1275 if (!cifs_convert_address( 1276 (struct sockaddr *)&ctx->srcaddr, 1277 param->string, strlen(param->string))) { 1278 pr_warn("Could not parse srcaddr: %s\n", 1279 param->string); 1280 goto cifs_parse_mount_err; 1281 } 1282 break; 1283 case Opt_iocharset: 1284 if (strnlen(param->string, 1024) >= 65) { 1285 pr_warn("iocharset name too long\n"); 1286 goto cifs_parse_mount_err; 1287 } 1288 1289 if (strncasecmp(param->string, "default", 7) != 0) { 1290 kfree(ctx->iocharset); 1291 ctx->iocharset = kstrdup(param->string, GFP_KERNEL); 1292 if (ctx->iocharset == NULL) { 1293 cifs_errorf(fc, "OOM when copying iocharset string\n"); 1294 goto cifs_parse_mount_err; 1295 } 1296 } 1297 /* if iocharset not set then load_nls_default 1298 * is used by caller 1299 */ 1300 cifs_dbg(FYI, "iocharset set to %s\n", ctx->iocharset); 1301 break; 1302 case Opt_netbiosname: 1303 memset(ctx->source_rfc1001_name, 0x20, 1304 RFC1001_NAME_LEN); 1305 /* 1306 * FIXME: are there cases in which a comma can 1307 * be valid in workstation netbios name (and 1308 * need special handling)? 1309 */ 1310 for (i = 0; i < RFC1001_NAME_LEN; i++) { 1311 /* don't ucase netbiosname for user */ 1312 if (param->string[i] == 0) 1313 break; 1314 ctx->source_rfc1001_name[i] = param->string[i]; 1315 } 1316 /* The string has 16th byte zero still from 1317 * set at top of the function 1318 */ 1319 if (i == RFC1001_NAME_LEN && param->string[i] != 0) 1320 pr_warn("netbiosname longer than 15 truncated\n"); 1321 break; 1322 case Opt_servern: 1323 /* last byte, type, is 0x20 for servr type */ 1324 memset(ctx->target_rfc1001_name, 0x20, 1325 RFC1001_NAME_LEN_WITH_NULL); 1326 /* 1327 * BB are there cases in which a comma can be valid in this 1328 * workstation netbios name (and need special handling)? 1329 */ 1330 1331 /* user or mount helper must uppercase the netbios name */ 1332 for (i = 0; i < 15; i++) { 1333 if (param->string[i] == 0) 1334 break; 1335 ctx->target_rfc1001_name[i] = param->string[i]; 1336 } 1337 1338 /* The string has 16th byte zero still from set at top of function */ 1339 if (i == RFC1001_NAME_LEN && param->string[i] != 0) 1340 pr_warn("server netbiosname longer than 15 truncated\n"); 1341 break; 1342 case Opt_ver: 1343 /* version of mount userspace tools, not dialect */ 1344 /* If interface changes in mount.cifs bump to new ver */ 1345 if (strncasecmp(param->string, "1", 1) == 0) { 1346 if (strlen(param->string) > 1) { 1347 pr_warn("Bad mount helper ver=%s. Did you want SMB1 (CIFS) dialect and mean to type vers=1.0 instead?\n", 1348 param->string); 1349 goto cifs_parse_mount_err; 1350 } 1351 /* This is the default */ 1352 break; 1353 } 1354 /* For all other value, error */ 1355 pr_warn("Invalid mount helper version specified\n"); 1356 goto cifs_parse_mount_err; 1357 case Opt_vers: 1358 /* protocol version (dialect) */ 1359 if (cifs_parse_smb_version(fc, param->string, ctx, is_smb3) != 0) 1360 goto cifs_parse_mount_err; 1361 ctx->got_version = true; 1362 break; 1363 case Opt_sec: 1364 if (cifs_parse_security_flavors(fc, param->string, ctx) != 0) 1365 goto cifs_parse_mount_err; 1366 break; 1367 case Opt_cache: 1368 if (cifs_parse_cache_flavor(fc, param->string, ctx) != 0) 1369 goto cifs_parse_mount_err; 1370 break; 1371 case Opt_witness: 1372 #ifndef CONFIG_CIFS_SWN_UPCALL 1373 cifs_errorf(fc, "Witness support needs CONFIG_CIFS_SWN_UPCALL config option\n"); 1374 goto cifs_parse_mount_err; 1375 #endif 1376 ctx->witness = true; 1377 pr_warn_once("Witness protocol support is experimental\n"); 1378 break; 1379 case Opt_rootfs: 1380 #ifndef CONFIG_CIFS_ROOT 1381 cifs_dbg(VFS, "rootfs support requires CONFIG_CIFS_ROOT config option\n"); 1382 goto cifs_parse_mount_err; 1383 #endif 1384 ctx->rootfs = true; 1385 break; 1386 case Opt_posixpaths: 1387 if (result.negated) 1388 ctx->posix_paths = 0; 1389 else 1390 ctx->posix_paths = 1; 1391 break; 1392 case Opt_unix: 1393 if (result.negated) { 1394 if (ctx->linux_ext == 1) 1395 pr_warn_once("conflicting posix mount options specified\n"); 1396 ctx->linux_ext = 0; 1397 ctx->no_linux_ext = 1; 1398 } else { 1399 if (ctx->no_linux_ext == 1) 1400 pr_warn_once("conflicting posix mount options specified\n"); 1401 ctx->linux_ext = 1; 1402 ctx->no_linux_ext = 0; 1403 } 1404 break; 1405 case Opt_nocase: 1406 ctx->nocase = 1; 1407 break; 1408 case Opt_brl: 1409 if (result.negated) { 1410 /* 1411 * turn off mandatory locking in mode 1412 * if remote locking is turned off since the 1413 * local vfs will do advisory 1414 */ 1415 if (ctx->file_mode == 1416 (S_IALLUGO & ~(S_ISUID | S_IXGRP))) 1417 ctx->file_mode = S_IALLUGO; 1418 ctx->nobrl = 1; 1419 } else 1420 ctx->nobrl = 0; 1421 break; 1422 case Opt_handlecache: 1423 if (result.negated) 1424 ctx->nohandlecache = 1; 1425 else 1426 ctx->nohandlecache = 0; 1427 break; 1428 case Opt_forcemandatorylock: 1429 ctx->mand_lock = 1; 1430 break; 1431 case Opt_setuids: 1432 ctx->setuids = result.negated; 1433 break; 1434 case Opt_intr: 1435 ctx->intr = !result.negated; 1436 break; 1437 case Opt_setuidfromacl: 1438 ctx->setuidfromacl = 1; 1439 break; 1440 case Opt_strictsync: 1441 ctx->nostrictsync = result.negated; 1442 break; 1443 case Opt_serverino: 1444 ctx->server_ino = !result.negated; 1445 break; 1446 case Opt_rwpidforward: 1447 ctx->rwpidforward = 1; 1448 break; 1449 case Opt_modesid: 1450 ctx->mode_ace = 1; 1451 break; 1452 case Opt_cifsacl: 1453 ctx->cifs_acl = !result.negated; 1454 break; 1455 case Opt_acl: 1456 ctx->no_psx_acl = result.negated; 1457 break; 1458 case Opt_locallease: 1459 ctx->local_lease = 1; 1460 break; 1461 case Opt_sign: 1462 ctx->sign = true; 1463 break; 1464 case Opt_ignore_signature: 1465 ctx->sign = true; 1466 ctx->ignore_signature = true; 1467 break; 1468 case Opt_seal: 1469 /* we do not do the following in secFlags because seal 1470 * is a per tree connection (mount) not a per socket 1471 * or per-smb connection option in the protocol 1472 * vol->secFlg |= CIFSSEC_MUST_SEAL; 1473 */ 1474 ctx->seal = 1; 1475 break; 1476 case Opt_noac: 1477 pr_warn("Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n"); 1478 break; 1479 case Opt_fsc: 1480 #ifndef CONFIG_CIFS_FSCACHE 1481 cifs_errorf(fc, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n"); 1482 goto cifs_parse_mount_err; 1483 #endif 1484 ctx->fsc = true; 1485 break; 1486 case Opt_mfsymlinks: 1487 ctx->mfsymlinks = true; 1488 break; 1489 case Opt_multiuser: 1490 ctx->multiuser = true; 1491 break; 1492 case Opt_sloppy: 1493 ctx->sloppy = true; 1494 break; 1495 case Opt_nosharesock: 1496 ctx->nosharesock = true; 1497 break; 1498 case Opt_persistent: 1499 if (result.negated) { 1500 ctx->nopersistent = true; 1501 if (ctx->persistent) { 1502 cifs_errorf(fc, "persistenthandles mount options conflict\n"); 1503 goto cifs_parse_mount_err; 1504 } 1505 } else { 1506 ctx->persistent = true; 1507 if ((ctx->nopersistent) || (ctx->resilient)) { 1508 cifs_errorf(fc, "persistenthandles mount options conflict\n"); 1509 goto cifs_parse_mount_err; 1510 } 1511 } 1512 break; 1513 case Opt_resilient: 1514 if (result.negated) { 1515 ctx->resilient = false; /* already the default */ 1516 } else { 1517 ctx->resilient = true; 1518 if (ctx->persistent) { 1519 cifs_errorf(fc, "persistenthandles mount options conflict\n"); 1520 goto cifs_parse_mount_err; 1521 } 1522 } 1523 break; 1524 case Opt_tcp_nodelay: 1525 /* tcp nodelay should not usually be needed since we CORK/UNCORK the socket */ 1526 if (result.negated) 1527 ctx->sockopt_tcp_nodelay = false; 1528 else 1529 ctx->sockopt_tcp_nodelay = true; 1530 break; 1531 case Opt_domainauto: 1532 ctx->domainauto = true; 1533 break; 1534 case Opt_rdma: 1535 ctx->rdma = true; 1536 break; 1537 } 1538 /* case Opt_ignore: - is ignored as expected ... */ 1539 1540 return 0; 1541 1542 cifs_parse_mount_err: 1543 kfree_sensitive(ctx->password); 1544 ctx->password = NULL; 1545 return -EINVAL; 1546 } 1547 1548 int smb3_init_fs_context(struct fs_context *fc) 1549 { 1550 struct smb3_fs_context *ctx; 1551 char *nodename = utsname()->nodename; 1552 int i; 1553 1554 ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL); 1555 if (unlikely(!ctx)) 1556 return -ENOMEM; 1557 1558 strscpy(ctx->workstation_name, nodename, sizeof(ctx->workstation_name)); 1559 1560 /* 1561 * does not have to be perfect mapping since field is 1562 * informational, only used for servers that do not support 1563 * port 445 and it can be overridden at mount time 1564 */ 1565 memset(ctx->source_rfc1001_name, 0x20, RFC1001_NAME_LEN); 1566 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++) 1567 ctx->source_rfc1001_name[i] = toupper(nodename[i]); 1568 1569 ctx->source_rfc1001_name[RFC1001_NAME_LEN] = 0; 1570 /* 1571 * null target name indicates to use *SMBSERVR default called name 1572 * if we end up sending RFC1001 session initialize 1573 */ 1574 ctx->target_rfc1001_name[0] = 0; 1575 ctx->cred_uid = current_uid(); 1576 ctx->linux_uid = current_uid(); 1577 ctx->linux_gid = current_gid(); 1578 /* By default 4MB read ahead size, 1MB block size */ 1579 ctx->bsize = CIFS_DEFAULT_IOSIZE; /* can improve cp performance significantly */ 1580 ctx->rasize = 0; /* 0 = use default (ie negotiated rsize) for read ahead pages */ 1581 1582 /* 1583 * default to SFM style remapping of seven reserved characters 1584 * unless user overrides it or we negotiate CIFS POSIX where 1585 * it is unnecessary. Can not simultaneously use more than one mapping 1586 * since then readdir could list files that open could not open 1587 */ 1588 ctx->remap = true; 1589 1590 /* default to only allowing write access to owner of the mount */ 1591 ctx->dir_mode = ctx->file_mode = S_IRUGO | S_IXUGO | S_IWUSR; 1592 1593 /* ctx->retry default is 0 (i.e. "soft" limited retry not hard retry) */ 1594 /* default is always to request posix paths. */ 1595 ctx->posix_paths = 1; 1596 /* default to using server inode numbers where available */ 1597 ctx->server_ino = 1; 1598 1599 /* default is to use strict cifs caching semantics */ 1600 ctx->strict_io = true; 1601 1602 ctx->acregmax = CIFS_DEF_ACTIMEO; 1603 ctx->acdirmax = CIFS_DEF_ACTIMEO; 1604 ctx->closetimeo = SMB3_DEF_DCLOSETIMEO; 1605 ctx->max_cached_dirs = MAX_CACHED_FIDS; 1606 /* Most clients set timeout to 0, allows server to use its default */ 1607 ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */ 1608 1609 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */ 1610 ctx->ops = &smb30_operations; 1611 ctx->vals = &smbdefault_values; 1612 1613 ctx->echo_interval = SMB_ECHO_INTERVAL_DEFAULT; 1614 1615 /* default to no multichannel (single server connection) */ 1616 ctx->multichannel = false; 1617 ctx->max_channels = 1; 1618 1619 ctx->backupuid_specified = false; /* no backup intent for a user */ 1620 ctx->backupgid_specified = false; /* no backup intent for a group */ 1621 1622 /* 1623 * short int override_uid = -1; 1624 * short int override_gid = -1; 1625 * char *nodename = strdup(utsname()->nodename); 1626 * struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr; 1627 */ 1628 1629 fc->fs_private = ctx; 1630 fc->ops = &smb3_fs_context_ops; 1631 return 0; 1632 } 1633 1634 void 1635 smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx) 1636 { 1637 if (ctx == NULL) 1638 return; 1639 1640 /* 1641 * Make sure this stays in sync with smb3_fs_context_dup() 1642 */ 1643 kfree(ctx->username); 1644 ctx->username = NULL; 1645 kfree_sensitive(ctx->password); 1646 ctx->password = NULL; 1647 kfree(ctx->server_hostname); 1648 ctx->server_hostname = NULL; 1649 kfree(ctx->UNC); 1650 ctx->UNC = NULL; 1651 kfree(ctx->source); 1652 ctx->source = NULL; 1653 kfree(ctx->domainname); 1654 ctx->domainname = NULL; 1655 kfree(ctx->nodename); 1656 ctx->nodename = NULL; 1657 kfree(ctx->iocharset); 1658 ctx->iocharset = NULL; 1659 kfree(ctx->prepath); 1660 ctx->prepath = NULL; 1661 kfree(ctx->leaf_fullpath); 1662 ctx->leaf_fullpath = NULL; 1663 } 1664 1665 void 1666 smb3_cleanup_fs_context(struct smb3_fs_context *ctx) 1667 { 1668 if (!ctx) 1669 return; 1670 smb3_cleanup_fs_context_contents(ctx); 1671 kfree(ctx); 1672 } 1673 1674 void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb) 1675 { 1676 struct smb3_fs_context *ctx = cifs_sb->ctx; 1677 1678 if (ctx->nodfs) 1679 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS; 1680 else 1681 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_DFS; 1682 1683 if (ctx->noperm) 1684 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM; 1685 else 1686 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_PERM; 1687 1688 if (ctx->setuids) 1689 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID; 1690 else 1691 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SET_UID; 1692 1693 if (ctx->setuidfromacl) 1694 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL; 1695 else 1696 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UID_FROM_ACL; 1697 1698 if (ctx->server_ino) 1699 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM; 1700 else 1701 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; 1702 1703 if (ctx->remap) 1704 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR; 1705 else 1706 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SFM_CHR; 1707 1708 if (ctx->sfu_remap) 1709 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR; 1710 else 1711 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SPECIAL_CHR; 1712 1713 if (ctx->no_xattr) 1714 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR; 1715 else 1716 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_XATTR; 1717 1718 if (ctx->sfu_emul) 1719 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL; 1720 else 1721 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UNX_EMUL; 1722 1723 if (ctx->nobrl) 1724 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL; 1725 else 1726 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_BRL; 1727 1728 if (ctx->nohandlecache) 1729 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE; 1730 else 1731 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_HANDLE_CACHE; 1732 1733 if (ctx->nostrictsync) 1734 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC; 1735 else 1736 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOSSYNC; 1737 1738 if (ctx->mand_lock) 1739 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL; 1740 else 1741 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOPOSIXBRL; 1742 1743 if (ctx->rwpidforward) 1744 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD; 1745 else 1746 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_RWPIDFORWARD; 1747 1748 if (ctx->mode_ace) 1749 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID; 1750 else 1751 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MODE_FROM_SID; 1752 1753 if (ctx->cifs_acl) 1754 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL; 1755 else 1756 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_ACL; 1757 1758 if (ctx->backupuid_specified) 1759 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID; 1760 else 1761 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPUID; 1762 1763 if (ctx->backupgid_specified) 1764 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID; 1765 else 1766 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPGID; 1767 1768 if (ctx->override_uid) 1769 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID; 1770 else 1771 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_UID; 1772 1773 if (ctx->override_gid) 1774 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID; 1775 else 1776 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_GID; 1777 1778 if (ctx->dynperm) 1779 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM; 1780 else 1781 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DYNPERM; 1782 1783 if (ctx->fsc) 1784 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE; 1785 else 1786 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_FSCACHE; 1787 1788 if (ctx->multiuser) 1789 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER | 1790 CIFS_MOUNT_NO_PERM); 1791 else 1792 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MULTIUSER; 1793 1794 1795 if (ctx->strict_io) 1796 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO; 1797 else 1798 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_STRICT_IO; 1799 1800 if (ctx->direct_io) 1801 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO; 1802 else 1803 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DIRECT_IO; 1804 1805 if (ctx->mfsymlinks) 1806 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS; 1807 else 1808 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MF_SYMLINKS; 1809 if (ctx->mfsymlinks) { 1810 if (ctx->sfu_emul) { 1811 /* 1812 * Our SFU ("Services for Unix" emulation does not allow 1813 * creating symlinks but does allow reading existing SFU 1814 * symlinks (it does allow both creating and reading SFU 1815 * style mknod and FIFOs though). When "mfsymlinks" and 1816 * "sfu" are both enabled at the same time, it allows 1817 * reading both types of symlinks, but will only create 1818 * them with mfsymlinks format. This allows better 1819 * Apple compatibility (probably better for Samba too) 1820 * while still recognizing old Windows style symlinks. 1821 */ 1822 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n"); 1823 } 1824 } 1825 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SHUTDOWN; 1826 1827 return; 1828 } 1829