Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netsmb/smb_conn.c
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1 /* $NetBSD: smb_conn.c,v 1.22 2006/11/16 01:33:51 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2000-2001 Boris Popov 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Boris Popov. 18 * 4. Neither the name of the author nor the names of any co-contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * FreeBSD: src/sys/netsmb/smb_conn.c,v 1.3 2001/12/02 08:47:29 bp Exp 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: smb_conn.c,v 1.22 2006/11/16 01:33:51 christos Exp $"); 39 40 /* 41 * Connection engine. 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/proc.h> 49 #include <sys/lock.h> 50 #include <sys/sysctl.h> 51 #include <sys/mbuf.h> /* for M_SONAME */ 52 #include <sys/kauth.h> 53 54 #include <netsmb/iconv.h> 55 56 #include <netsmb/smb.h> 57 #include <netsmb/smb_subr.h> 58 #include <netsmb/smb_conn.h> 59 #include <netsmb/smb_tran.h> 60 #include <netsmb/smb_trantcp.h> 61 62 static struct smb_connobj smb_vclist; 63 static int smb_vcnext = 1; /* next unique id for VC */ 64 65 #ifndef __NetBSD__ 66 SYSCTL_NODE(_net, OID_AUTO, smb, CTLFLAG_RW, NULL, "SMB protocol"); 67 #endif 68 69 MALLOC_DEFINE(M_SMBCONN, "SMB conn", "SMB connection"); 70 71 static void smb_co_init(struct smb_connobj *cp, int level, const char *objname); 72 static void smb_co_done(struct smb_connobj *cp); 73 #ifdef DIAGNOSTIC 74 static int smb_co_lockstatus(struct smb_connobj *cp); 75 #endif 76 77 static int smb_vc_disconnect(struct smb_vc *vcp); 78 static void smb_vc_free(struct smb_connobj *cp); 79 static void smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred); 80 static smb_co_free_t smb_share_free; 81 static smb_co_gone_t smb_share_gone; 82 83 #ifndef __NetBSD__ 84 static int smb_sysctl_treedump(SYSCTL_HANDLER_ARGS); 85 86 SYSCTL_PROC(_net_smb, OID_AUTO, treedump, CTLFLAG_RD | CTLTYPE_OPAQUE, 87 NULL, 0, smb_sysctl_treedump, "S,treedump", "Requester tree"); 88 #endif 89 90 int 91 smb_sm_init(void) 92 { 93 94 smb_co_init(&smb_vclist, SMBL_SM, "smbsm"); 95 smb_co_unlock(&smb_vclist, 0); 96 return 0; 97 } 98 99 int 100 smb_sm_done(void) 101 { 102 103 /* XXX: hold the mutex */ 104 #ifdef DIAGNOSTIC 105 if (smb_vclist.co_usecount > 1) 106 panic("%d connections still active", smb_vclist.co_usecount - 1); 107 #endif 108 smb_co_done(&smb_vclist); 109 return 0; 110 } 111 112 static int 113 smb_sm_lockvclist(int flags) 114 { 115 116 return smb_co_lock(&smb_vclist, flags | LK_CANRECURSE); 117 } 118 119 static void 120 smb_sm_unlockvclist(void) 121 { 122 123 smb_co_unlock(&smb_vclist, LK_RELEASE); 124 } 125 126 static int 127 smb_sm_lookupint(struct smb_vcspec *vcspec, struct smb_sharespec *shspec, 128 struct smb_cred *scred, struct smb_vc **vcpp) 129 { 130 struct smb_connobj *ocp; 131 int exact = 1; 132 int fail = 1; 133 134 vcspec->shspec = shspec; 135 SMBCO_FOREACH(ocp, &smb_vclist) { 136 struct smb_vc *vcp = (struct smb_vc *)ocp; 137 138 if (smb_vc_lock(vcp, LK_EXCLUSIVE) != 0) 139 continue; 140 141 do { 142 if ((ocp->co_flags & SMBV_PRIVATE) || 143 !CONNADDREQ(vcp->vc_paddr, vcspec->sap) || 144 strcmp(vcp->vc_username, vcspec->username) != 0) 145 break; 146 147 if (vcspec->owner != SMBM_ANY_OWNER) { 148 if (vcp->vc_uid != vcspec->owner) 149 break; 150 } else 151 exact = 0; 152 if (vcspec->group != SMBM_ANY_GROUP) { 153 if (vcp->vc_grp != vcspec->group) 154 break; 155 } else 156 exact = 0; 157 158 if (vcspec->mode & SMBM_EXACT) { 159 if (!exact || 160 (vcspec->mode & SMBM_MASK) != vcp->vc_mode) 161 break; 162 } 163 if (smb_vc_access(vcp, scred, vcspec->mode) != 0) 164 break; 165 vcspec->ssp = NULL; 166 if (shspec 167 &&smb_vc_lookupshare(vcp, shspec, scred, &vcspec->ssp) != 0) 168 break; 169 170 /* if we get here, all checks succeeded */ 171 smb_vc_ref(vcp); 172 *vcpp = vcp; 173 fail = 0; 174 goto out; 175 } while(0); 176 177 smb_vc_unlock(vcp, 0); 178 } 179 180 out: 181 return fail; 182 } 183 184 int 185 smb_sm_lookup(struct smb_vcspec *vcspec, struct smb_sharespec *shspec, 186 struct smb_cred *scred, struct smb_vc **vcpp) 187 { 188 struct smb_vc *vcp; 189 struct smb_share *ssp = NULL; 190 int fail, error; 191 192 *vcpp = vcp = NULL; 193 194 error = smb_sm_lockvclist(LK_EXCLUSIVE); 195 if (error) 196 return error; 197 fail = smb_sm_lookupint(vcspec, shspec, scred, vcpp); 198 if (!fail || (vcspec->flags & SMBV_CREATE) == 0) { 199 smb_sm_unlockvclist(); 200 return 0; 201 } 202 fail = smb_sm_lookupint(vcspec, NULL, scred, &vcp); 203 if (fail) { 204 error = smb_vc_create(vcspec, scred, &vcp); 205 if (error) 206 goto out; 207 error = smb_vc_connect(vcp, scred); 208 if (error) 209 goto out; 210 } 211 if (shspec == NULL) 212 goto out; 213 error = smb_share_create(vcp, shspec, scred, &ssp); 214 if (error) 215 goto out; 216 error = smb_smb_treeconnect(ssp, scred); 217 if (error == 0) 218 vcspec->ssp = ssp; 219 else 220 smb_share_put(ssp, scred); 221 out: 222 smb_sm_unlockvclist(); 223 if (error == 0) 224 *vcpp = vcp; 225 else if (vcp) 226 smb_vc_put(vcp, scred); 227 return error; 228 } 229 230 /* 231 * Common code for connection object 232 */ 233 static void 234 smb_co_init(struct smb_connobj *cp, int level, const char *objname) 235 { 236 SLIST_INIT(&cp->co_children); 237 smb_sl_init(&cp->co_interlock, objname); 238 lockinit(&cp->co_lock, PZERO, objname, 0, 0); 239 cp->co_level = level; 240 cp->co_usecount = 1; 241 KASSERT(smb_co_lock(cp, LK_EXCLUSIVE) == 0); 242 } 243 244 static void 245 smb_co_done(struct smb_connobj *cp) 246 { 247 smb_sl_destroy(&cp->co_interlock); 248 #ifdef __NetBSD__ 249 lockmgr(&cp->co_lock, LK_DRAIN, NULL); 250 #else 251 lockdestroy(&cp->co_lock); 252 #endif 253 } 254 255 static void 256 smb_co_gone(struct smb_connobj *cp, struct smb_cred *scred) 257 { 258 struct smb_connobj *parent; 259 260 if (cp->co_gone) 261 cp->co_gone(cp, scred); 262 parent = cp->co_parent; 263 if (parent) { 264 smb_co_lock(parent, LK_EXCLUSIVE|LK_CANRECURSE); 265 SLIST_REMOVE(&parent->co_children, cp, smb_connobj, co_next); 266 smb_co_put(parent, scred); 267 } 268 if (cp->co_free) 269 cp->co_free(cp); 270 } 271 272 void 273 smb_co_ref(struct smb_connobj *cp) 274 { 275 276 SMB_CO_LOCK(cp); 277 cp->co_usecount++; 278 SMB_CO_UNLOCK(cp); 279 } 280 281 void 282 smb_co_rele(struct smb_connobj *cp, struct smb_cred *scred) 283 { 284 SMB_CO_LOCK(cp); 285 lockmgr(&cp->co_lock, LK_RELEASE, NULL); 286 if (cp->co_usecount > 1) { 287 cp->co_usecount--; 288 SMB_CO_UNLOCK(cp); 289 return; 290 } 291 #ifdef DIAGNOSTIC 292 if (cp->co_usecount == 0) 293 panic("negative use_count for object %d", cp->co_level); 294 #endif 295 cp->co_usecount--; 296 cp->co_flags |= SMBO_GONE; 297 SMB_CO_UNLOCK(cp); 298 299 smb_co_gone(cp, scred); 300 } 301 302 int 303 smb_co_get(struct smb_connobj *cp, int flags, struct smb_cred *scred) 304 { 305 int error; 306 307 if ((flags & LK_INTERLOCK) == 0) 308 SMB_CO_LOCK(cp); 309 cp->co_usecount++; 310 error = smb_co_lock(cp, flags | LK_INTERLOCK); 311 if (error) { 312 SMB_CO_LOCK(cp); 313 cp->co_usecount--; 314 SMB_CO_UNLOCK(cp); 315 return error; 316 } 317 return 0; 318 } 319 320 void 321 smb_co_put(struct smb_connobj *cp, struct smb_cred *scred) 322 { 323 324 SMB_CO_LOCK(cp); 325 if (cp->co_usecount > 1) { 326 cp->co_usecount--; 327 } else if (cp->co_usecount == 1) { 328 cp->co_usecount--; 329 cp->co_flags |= SMBO_GONE; 330 } 331 #ifdef DIAGNOSTIC 332 else 333 panic("smb_co_put: negative usecount"); 334 #endif 335 lockmgr(&cp->co_lock, LK_RELEASE | LK_INTERLOCK, &cp->co_interlock); 336 if ((cp->co_flags & SMBO_GONE) == 0) 337 return; 338 smb_co_gone(cp, scred); 339 } 340 341 #ifdef DIAGNOSTIC 342 int 343 smb_co_lockstatus(struct smb_connobj *cp) 344 { 345 return lockstatus(&cp->co_lock); 346 } 347 #endif 348 349 int 350 smb_co_lock(struct smb_connobj *cp, int flags) 351 { 352 353 if (cp->co_flags & SMBO_GONE) 354 return EINVAL; 355 if ((flags & LK_TYPE_MASK) == 0) 356 flags |= LK_EXCLUSIVE; 357 return lockmgr(&cp->co_lock, flags, &cp->co_interlock); 358 } 359 360 void 361 smb_co_unlock(struct smb_connobj *cp, int flags) 362 { 363 (void)lockmgr(&cp->co_lock, flags | LK_RELEASE, &cp->co_interlock); 364 } 365 366 static void 367 smb_co_addchild(struct smb_connobj *parent, struct smb_connobj *child) 368 { 369 KASSERT(smb_co_lockstatus(parent) == LK_EXCLUSIVE); 370 KASSERT(smb_co_lockstatus(child) == LK_EXCLUSIVE); 371 372 smb_co_ref(parent); 373 SLIST_INSERT_HEAD(&parent->co_children, child, co_next); 374 child->co_parent = parent; 375 } 376 377 /* 378 * Session implementation 379 */ 380 381 int 382 smb_vc_create(struct smb_vcspec *vcspec, 383 struct smb_cred *scred, struct smb_vc **vcpp) 384 { 385 struct smb_vc *vcp; 386 kauth_cred_t cred = scred->scr_cred; 387 uid_t uid = vcspec->owner; 388 gid_t gid = vcspec->group; 389 uid_t realuid; 390 char *domain = vcspec->domain; 391 int error, isroot, ismember = 0; 392 393 realuid = kauth_cred_geteuid(cred); 394 isroot = (smb_suser(cred) == 0); 395 /* 396 * Only superuser can create VCs with different uid and gid 397 */ 398 if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot) 399 return EPERM; 400 401 if (gid != SMBM_ANY_GROUP && 402 (kauth_cred_ismember_gid(cred, gid, &ismember) != 0 || !ismember) && 403 !isroot) 404 return EPERM; 405 406 vcp = smb_zmalloc(sizeof(*vcp), M_SMBCONN, M_WAITOK); 407 smb_co_init(VCTOCP(vcp), SMBL_VC, "smb_vc"); 408 vcp->obj.co_free = smb_vc_free; 409 vcp->obj.co_gone = smb_vc_gone; 410 vcp->vc_number = smb_vcnext++; 411 vcp->vc_smbuid = SMB_UID_UNKNOWN; 412 vcp->vc_mode = vcspec->rights & SMBM_MASK; 413 vcp->obj.co_flags = vcspec->flags & (SMBV_PRIVATE | SMBV_SINGLESHARE); 414 vcp->vc_tdesc = &smb_tran_nbtcp_desc; 415 416 if (uid == SMBM_ANY_OWNER) 417 uid = realuid; 418 if (gid == SMBM_ANY_GROUP) 419 gid = kauth_cred_group(cred, 0); 420 vcp->vc_uid = uid; 421 vcp->vc_grp = gid; 422 423 smb_sl_init(&vcp->vc_stlock, "vcstlock"); 424 error = ENOMEM; 425 if ((vcp->vc_paddr = dup_sockaddr(vcspec->sap, 1)) == NULL) 426 goto fail; 427 428 if ((vcp->vc_laddr = dup_sockaddr(vcspec->lap, 1)) == NULL) 429 goto fail; 430 431 if ((vcp->vc_pass = smb_strdup(vcspec->pass)) == NULL) 432 goto fail; 433 434 vcp->vc_domain = smb_strdup((domain && domain[0]) ? domain : "NODOMAIN"); 435 if (vcp->vc_domain == NULL) 436 goto fail; 437 438 if ((vcp->vc_srvname = smb_strdup(vcspec->srvname)) == NULL) 439 goto fail; 440 441 if ((vcp->vc_username = smb_strdup(vcspec->username)) == NULL) 442 goto fail; 443 444 #define ithrow(cmd) \ 445 if ((error = cmd)) \ 446 goto fail 447 448 ithrow(iconv_open("tolower", vcspec->localcs, &vcp->vc_tolower)); 449 ithrow(iconv_open("toupper", vcspec->localcs, &vcp->vc_toupper)); 450 if (vcspec->servercs[0]) { 451 ithrow(iconv_open(vcspec->servercs, vcspec->localcs, 452 &vcp->vc_toserver)); 453 ithrow(iconv_open(vcspec->localcs, vcspec->servercs, 454 &vcp->vc_tolocal)); 455 } 456 457 ithrow(smb_iod_create(vcp)); 458 459 #undef ithrow 460 461 /* all is well, return success */ 462 *vcpp = vcp; 463 smb_co_addchild(&smb_vclist, VCTOCP(vcp)); 464 465 return 0; 466 467 fail: 468 smb_vc_put(vcp, scred); 469 return (error); 470 471 } 472 473 static void 474 smb_vc_free(struct smb_connobj *cp) 475 { 476 struct smb_vc *vcp = CPTOVC(cp); 477 478 if (vcp->vc_iod) 479 smb_iod_destroy(vcp->vc_iod); 480 SMB_STRFREE(vcp->vc_username); 481 SMB_STRFREE(vcp->vc_srvname); 482 SMB_STRFREE(vcp->vc_pass); 483 SMB_STRFREE(vcp->vc_domain); 484 if (vcp->vc_paddr) 485 free(vcp->vc_paddr, M_SONAME); 486 if (vcp->vc_laddr) 487 free(vcp->vc_laddr, M_SONAME); 488 if (vcp->vc_tolower) 489 iconv_close(vcp->vc_tolower); 490 if (vcp->vc_toupper) 491 iconv_close(vcp->vc_toupper); 492 if (vcp->vc_tolocal) 493 iconv_close(vcp->vc_tolocal); 494 if (vcp->vc_toserver) 495 iconv_close(vcp->vc_toserver); 496 smb_co_done(VCTOCP(vcp)); 497 smb_sl_destroy(&vcp->vc_stlock); 498 free(vcp, M_SMBCONN); 499 } 500 501 /* 502 * Called when use count of VC dropped to zero. 503 * VC should be locked on enter with LK_DRAIN. 504 */ 505 static void 506 smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred) 507 { 508 struct smb_vc *vcp = CPTOVC(cp); 509 510 smb_vc_disconnect(vcp); 511 } 512 513 void 514 smb_vc_ref(struct smb_vc *vcp) 515 { 516 smb_co_ref(VCTOCP(vcp)); 517 } 518 519 void 520 smb_vc_rele(struct smb_vc *vcp, struct smb_cred *scred) 521 { 522 smb_co_rele(VCTOCP(vcp), scred); 523 } 524 525 int 526 smb_vc_get(struct smb_vc *vcp, int flags, struct smb_cred *scred) 527 { 528 return smb_co_get(VCTOCP(vcp), flags, scred); 529 } 530 531 void 532 smb_vc_put(struct smb_vc *vcp, struct smb_cred *scred) 533 { 534 smb_co_put(VCTOCP(vcp), scred); 535 } 536 537 int 538 smb_vc_lock(struct smb_vc *vcp, int flags) 539 { 540 return smb_co_lock(VCTOCP(vcp), flags); 541 } 542 543 void 544 smb_vc_unlock(struct smb_vc *vcp, int flags) 545 { 546 smb_co_unlock(VCTOCP(vcp), flags); 547 } 548 549 int 550 smb_vc_access(struct smb_vc *vcp, struct smb_cred *scred, mode_t mode) 551 { 552 kauth_cred_t cred = scred->scr_cred; 553 int ismember = 0; 554 555 if (smb_suser(cred) == 0 || kauth_cred_geteuid(cred) == vcp->vc_uid) 556 return 0; 557 mode >>= 3; 558 if (kauth_cred_ismember_gid(cred, vcp->vc_grp, &ismember) != 0 || 559 !ismember) 560 mode >>= 3; 561 return (vcp->vc_mode & mode) == mode ? 0 : EACCES; 562 } 563 564 static int 565 smb_vc_cmpshare(struct smb_share *ssp, struct smb_sharespec *dp) 566 { 567 int exact = 1; 568 569 if (strcmp(ssp->ss_name, dp->name) != 0) 570 return 1; 571 if (dp->owner != SMBM_ANY_OWNER) { 572 if (ssp->ss_uid != dp->owner) 573 return 1; 574 } else 575 exact = 0; 576 if (dp->group != SMBM_ANY_GROUP) { 577 if (ssp->ss_grp != dp->group) 578 return 1; 579 } else 580 exact = 0; 581 582 if (dp->mode & SMBM_EXACT) { 583 if (!exact) 584 return 1; 585 return (dp->mode & SMBM_MASK) == ssp->ss_mode ? 0 : 1; 586 } 587 if (smb_share_access(ssp, dp->scred, dp->mode) != 0) 588 return 1; 589 return 0; 590 } 591 592 /* 593 * Lookup share in the given VC. Share referenced and locked on return. 594 * VC expected to be locked on entry and will be left locked on exit. 595 */ 596 int 597 smb_vc_lookupshare(struct smb_vc *vcp, struct smb_sharespec *dp, 598 struct smb_cred *scred, struct smb_share **sspp) 599 { 600 struct smb_connobj *osp; 601 struct smb_share *ssp = NULL; 602 int error; 603 604 *sspp = NULL; 605 dp->scred = scred; 606 SMBCO_FOREACH(osp, VCTOCP(vcp)) { 607 ssp = (struct smb_share *)osp; 608 error = smb_share_lock(ssp, LK_EXCLUSIVE); 609 if (error) 610 continue; 611 if (smb_vc_cmpshare(ssp, dp) == 0) 612 break; 613 smb_share_unlock(ssp, 0); 614 } 615 if (ssp) { 616 smb_share_ref(ssp); 617 *sspp = ssp; 618 error = 0; 619 } else 620 error = ENOENT; 621 return error; 622 } 623 624 int 625 smb_vc_connect(struct smb_vc *vcp, struct smb_cred *scred) 626 { 627 628 return smb_iod_request(vcp->vc_iod, SMBIOD_EV_CONNECT | SMBIOD_EV_SYNC, NULL); 629 } 630 631 /* 632 * Destroy VC to server, invalidate shares linked with it. 633 * Transport should be locked on entry. 634 */ 635 int 636 smb_vc_disconnect(struct smb_vc *vcp) 637 { 638 639 smb_iod_request(vcp->vc_iod, SMBIOD_EV_DISCONNECT | SMBIOD_EV_SYNC, NULL); 640 return 0; 641 } 642 643 static const char * const smb_emptypass = ""; 644 645 const char * 646 smb_vc_getpass(struct smb_vc *vcp) 647 { 648 if (vcp->vc_pass) 649 return vcp->vc_pass; 650 return smb_emptypass; 651 } 652 653 #ifndef __NetBSD__ 654 static int 655 smb_vc_getinfo(struct smb_vc *vcp, struct smb_vc_info *vip) 656 { 657 bzero(vip, sizeof(struct smb_vc_info)); 658 vip->itype = SMB_INFO_VC; 659 vip->usecount = vcp->obj.co_usecount; 660 vip->uid = vcp->vc_uid; 661 vip->gid = vcp->vc_grp; 662 vip->mode = vcp->vc_mode; 663 vip->flags = vcp->obj.co_flags; 664 vip->sopt = vcp->vc_sopt; 665 vip->iodstate = vcp->vc_iod->iod_state; 666 bzero(&vip->sopt.sv_skey, sizeof(vip->sopt.sv_skey)); 667 snprintf(vip->srvname, sizeof(vip->srvname), "%s", vcp->vc_srvname); 668 snprintf(vip->vcname, sizeof(vip->vcname), "%s", vcp->vc_username); 669 return 0; 670 } 671 #endif 672 673 u_short 674 smb_vc_nextmid(struct smb_vc *vcp) 675 { 676 u_short r; 677 678 SMB_CO_LOCK(&vcp->obj); 679 r = vcp->vc_mid++; 680 SMB_CO_UNLOCK(&vcp->obj); 681 return r; 682 } 683 684 /* 685 * Share implementation 686 */ 687 /* 688 * Allocate share structure and attach it to the given VC 689 * Connection expected to be locked on entry. Share will be returned 690 * in locked state. 691 */ 692 int 693 smb_share_create(struct smb_vc *vcp, struct smb_sharespec *shspec, 694 struct smb_cred *scred, struct smb_share **sspp) 695 { 696 struct smb_share *ssp; 697 kauth_cred_t cred = scred->scr_cred; 698 uid_t realuid; 699 uid_t uid = shspec->owner; 700 gid_t gid = shspec->group; 701 int error, isroot, ismember = 0; 702 703 realuid = kauth_cred_geteuid(cred); 704 isroot = smb_suser(cred) == 0; 705 /* 706 * Only superuser can create shares with different uid and gid 707 */ 708 if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot) 709 return EPERM; 710 if (gid != SMBM_ANY_GROUP && 711 (kauth_cred_ismember_gid(cred, gid, &ismember) != 0 || !ismember) && 712 !isroot) 713 return EPERM; 714 error = smb_vc_lookupshare(vcp, shspec, scred, &ssp); 715 if (!error) { 716 smb_share_put(ssp, scred); 717 return EEXIST; 718 } 719 if (uid == SMBM_ANY_OWNER) 720 uid = realuid; 721 if (gid == SMBM_ANY_GROUP) 722 gid = kauth_cred_group(cred, 0); 723 ssp = smb_zmalloc(sizeof(*ssp), M_SMBCONN, M_WAITOK); 724 smb_co_init(SSTOCP(ssp), SMBL_SHARE, "smbss"); 725 ssp->obj.co_free = smb_share_free; 726 ssp->obj.co_gone = smb_share_gone; 727 smb_sl_init(&ssp->ss_stlock, "ssstlock"); 728 ssp->ss_name = smb_strdup(shspec->name); 729 if (shspec->pass && shspec->pass[0]) 730 ssp->ss_pass = smb_strdup(shspec->pass); 731 ssp->ss_type = shspec->stype; 732 ssp->ss_tid = SMB_TID_UNKNOWN; 733 ssp->ss_uid = uid; 734 ssp->ss_grp = gid; 735 ssp->ss_mode = shspec->rights & SMBM_MASK; 736 smb_co_addchild(VCTOCP(vcp), SSTOCP(ssp)); 737 *sspp = ssp; 738 return 0; 739 } 740 741 static void 742 smb_share_free(struct smb_connobj *cp) 743 { 744 struct smb_share *ssp = CPTOSS(cp); 745 746 SMB_STRFREE(ssp->ss_name); 747 SMB_STRFREE(ssp->ss_pass); 748 smb_sl_destroy(&ssp->ss_stlock); 749 smb_co_done(SSTOCP(ssp)); 750 free(ssp, M_SMBCONN); 751 } 752 753 static void 754 smb_share_gone(struct smb_connobj *cp, struct smb_cred *scred) 755 { 756 struct smb_share *ssp = CPTOSS(cp); 757 758 smb_smb_treedisconnect(ssp, scred); 759 } 760 761 void 762 smb_share_ref(struct smb_share *ssp) 763 { 764 smb_co_ref(SSTOCP(ssp)); 765 } 766 767 void 768 smb_share_rele(struct smb_share *ssp, struct smb_cred *scred) 769 { 770 smb_co_rele(SSTOCP(ssp), scred); 771 } 772 773 int 774 smb_share_get(struct smb_share *ssp, int flags, struct smb_cred *scred) 775 { 776 return smb_co_get(SSTOCP(ssp), flags, scred); 777 } 778 779 void 780 smb_share_put(struct smb_share *ssp, struct smb_cred *scred) 781 { 782 smb_co_put(SSTOCP(ssp), scred); 783 } 784 785 int 786 smb_share_lock(struct smb_share *ssp, int flags) 787 { 788 return smb_co_lock(SSTOCP(ssp), flags); 789 } 790 791 void 792 smb_share_unlock(struct smb_share *ssp, int flags) 793 { 794 smb_co_unlock(SSTOCP(ssp), flags); 795 } 796 797 int 798 smb_share_access(struct smb_share *ssp, struct smb_cred *scred, mode_t mode) 799 { 800 kauth_cred_t cred = scred->scr_cred; 801 int ismember = 0; 802 803 if (smb_suser(cred) == 0 || kauth_cred_geteuid(cred) == ssp->ss_uid) 804 return 0; 805 mode >>= 3; 806 if (kauth_cred_ismember_gid(cred, ssp->ss_grp, &ismember) != 0 || 807 !ismember) 808 mode >>= 3; 809 return (ssp->ss_mode & mode) == mode ? 0 : EACCES; 810 } 811 812 int 813 smb_share_valid(struct smb_share *ssp) 814 { 815 return ssp->ss_tid != SMB_TID_UNKNOWN && 816 ssp->ss_vcgenid == SSTOVC(ssp)->vc_genid; 817 } 818 819 const char* 820 smb_share_getpass(struct smb_share *ssp) 821 { 822 struct smb_vc *vcp; 823 824 if (ssp->ss_pass) 825 return ssp->ss_pass; 826 vcp = SSTOVC(ssp); 827 if (vcp->vc_pass) 828 return vcp->vc_pass; 829 return smb_emptypass; 830 } 831 832 #ifndef __NetBSD__ 833 static int 834 smb_share_getinfo(struct smb_share *ssp, struct smb_share_info *sip) 835 { 836 bzero(sip, sizeof(struct smb_share_info)); 837 sip->itype = SMB_INFO_SHARE; 838 sip->usecount = ssp->obj.co_usecount; 839 sip->tid = ssp->ss_tid; 840 sip->type= ssp->ss_type; 841 sip->uid = ssp->ss_uid; 842 sip->gid = ssp->ss_grp; 843 sip->mode= ssp->ss_mode; 844 sip->flags = ssp->obj.co_flags; 845 snprintf(sip->sname, sizeof(sip->sname), "%s", ssp->ss_name); 846 return 0; 847 } 848 #endif 849 850 #ifndef __NetBSD__ 851 /* 852 * Dump an entire tree into sysctl call 853 */ 854 static int 855 smb_sysctl_treedump(SYSCTL_HANDLER_ARGS) 856 { 857 struct smb_cred scred; 858 struct smb_vc *vcp; 859 struct smb_share *ssp; 860 struct smb_vc_info vci; 861 struct smb_share_info ssi; 862 int error, itype; 863 864 smb_makescred(&scred, td, td->td_proc->p_cred); 865 error = smb_sm_lockvclist(LK_SHARED); 866 if (error) 867 return error; 868 SMBCO_FOREACH((struct smb_connobj*)vcp, &smb_vclist) { 869 error = smb_vc_lock(vcp, LK_SHARED); 870 if (error) 871 continue; 872 smb_vc_getinfo(vcp, &vci); 873 error = SYSCTL_OUT(req, &vci, sizeof(struct smb_vc_info)); 874 if (error) { 875 smb_vc_unlock(vcp, 0); 876 break; 877 } 878 SMBCO_FOREACH((struct smb_connobj*)ssp, VCTOCP(vcp)) { 879 error = smb_share_lock(ssp, LK_SHARED); 880 if (error) { 881 error = 0; 882 continue; 883 } 884 smb_share_getinfo(ssp, &ssi); 885 smb_share_unlock(ssp, 0); 886 error = SYSCTL_OUT(req, &ssi, sizeof(struct smb_share_info)); 887 if (error) 888 break; 889 } 890 smb_vc_unlock(vcp, 0); 891 if (error) 892 break; 893 } 894 if (!error) { 895 itype = SMB_INFO_NONE; 896 error = SYSCTL_OUT(req, &itype, sizeof(itype)); 897 } 898 smb_sm_unlockvclist(); 899 return error; 900 } 901 #endif
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