xref: /freebsd/sys/netsmb/smb_conn.c (revision fdafd315ad0d0f28a11b9fb4476a9ab059c62b92)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
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  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 /*
30  * Connection engine.
31  */
32 
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/priv.h>
38 #include <sys/proc.h>
39 #include <sys/lock.h>
40 #include <sys/sysctl.h>
41 #include <sys/socketvar.h>
42 
43 #include <sys/iconv.h>
44 
45 #include <netsmb/smb.h>
46 #include <netsmb/smb_subr.h>
47 #include <netsmb/smb_conn.h>
48 #include <netsmb/smb_tran.h>
49 #include <netsmb/smb_trantcp.h>
50 
51 static struct smb_connobj smb_vclist;
52 static int smb_vcnext = 1;	/* next unique id for VC */
53 
54 SYSCTL_NODE(_net, OID_AUTO, smb, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
55     "SMB protocol");
56 
57 static MALLOC_DEFINE(M_SMBCONN, "smb_conn", "SMB connection");
58 
59 static void smb_co_init(struct smb_connobj *cp, int level, char *ilockname,
60     char *lockname);
61 static void smb_co_done(struct smb_connobj *cp);
62 static int  smb_vc_disconnect(struct smb_vc *vcp);
63 static void smb_vc_free(struct smb_connobj *cp);
64 static void smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred);
65 static smb_co_free_t smb_share_free;
66 static smb_co_gone_t smb_share_gone;
67 
68 static int  smb_sysctl_treedump(SYSCTL_HANDLER_ARGS);
69 
70 SYSCTL_PROC(_net_smb, OID_AUTO, treedump,
71     CTLFLAG_RD | CTLTYPE_OPAQUE | CTLFLAG_MPSAFE,
72     NULL, 0, smb_sysctl_treedump, "S,treedump",
73     "Requester tree");
74 
75 int
smb_sm_init(void)76 smb_sm_init(void)
77 {
78 
79 	smb_co_init(&smb_vclist, SMBL_SM, "smbsm ilock", "smbsm");
80 	sx_xlock(&smb_vclist.co_interlock);
81 	smb_co_unlock(&smb_vclist);
82 	sx_unlock(&smb_vclist.co_interlock);
83 	return 0;
84 }
85 
86 int
smb_sm_done(void)87 smb_sm_done(void)
88 {
89 
90 	/* XXX: hold the mutex */
91 	if (smb_vclist.co_usecount > 1) {
92 		SMBERROR("%d connections still active\n", smb_vclist.co_usecount - 1);
93 		return EBUSY;
94 	}
95 	smb_co_done(&smb_vclist);
96 	return 0;
97 }
98 
99 static int
smb_sm_lockvclist(void)100 smb_sm_lockvclist(void)
101 {
102 	int error;
103 
104 	sx_xlock(&smb_vclist.co_interlock);
105 	error = smb_co_lock(&smb_vclist);
106 	sx_unlock(&smb_vclist.co_interlock);
107 
108 	return error;
109 }
110 
111 static void
smb_sm_unlockvclist(void)112 smb_sm_unlockvclist(void)
113 {
114 
115 	sx_xlock(&smb_vclist.co_interlock);
116 	smb_co_unlock(&smb_vclist);
117 	sx_unlock(&smb_vclist.co_interlock);
118 }
119 
120 static int
smb_sm_lookupint(struct smb_vcspec * vcspec,struct smb_sharespec * shspec,struct smb_cred * scred,struct smb_vc ** vcpp)121 smb_sm_lookupint(struct smb_vcspec *vcspec, struct smb_sharespec *shspec,
122 	struct smb_cred *scred,	struct smb_vc **vcpp)
123 {
124 	struct smb_connobj *scp;
125 	struct smb_vc *vcp;
126 	int exact = 1;
127 	int error;
128 
129 	vcspec->shspec = shspec;
130 	error = ENOENT;
131 	vcp = NULL;
132 	SMBCO_FOREACH(scp, &smb_vclist) {
133 		vcp = (struct smb_vc *)scp;
134 		error = smb_vc_lock(vcp);
135 		if (error)
136 			continue;
137 
138 		if ((vcp->obj.co_flags & SMBV_PRIVATE) ||
139 		    !CONNADDREQ(vcp->vc_paddr, vcspec->sap) ||
140 		    strcmp(vcp->vc_username, vcspec->username) != 0)
141 			goto err1;
142 		if (vcspec->owner != SMBM_ANY_OWNER) {
143 			if (vcp->vc_uid != vcspec->owner)
144 				goto err1;
145 		} else
146 			exact = 0;
147 		if (vcspec->group != SMBM_ANY_GROUP) {
148 			if (vcp->vc_grp != vcspec->group)
149 				goto err1;
150 		} else
151 			exact = 0;
152 		if (vcspec->mode & SMBM_EXACT) {
153 			if (!exact || (vcspec->mode & SMBM_MASK) !=
154 			    vcp->vc_mode)
155 				goto err1;
156 		}
157 		if (smb_vc_access(vcp, scred, vcspec->mode) != 0)
158 			goto err1;
159 		vcspec->ssp = NULL;
160 		if (shspec) {
161 			error = (int)smb_vc_lookupshare(vcp, shspec, scred,
162 			    &vcspec->ssp);
163 			if (error)
164 				goto fail;
165 		}
166 		error = 0;
167 		break;
168 	err1:
169 		error = 1;
170 	fail:
171 		smb_vc_unlock(vcp);
172 	}
173 	if (vcp) {
174 		smb_vc_ref(vcp);
175 		*vcpp = vcp;
176 	}
177 	return (error);
178 }
179 
180 int
smb_sm_lookup(struct smb_vcspec * vcspec,struct smb_sharespec * shspec,struct smb_cred * scred,struct smb_vc ** vcpp)181 smb_sm_lookup(struct smb_vcspec *vcspec, struct smb_sharespec *shspec,
182 	struct smb_cred *scred,	struct smb_vc **vcpp)
183 {
184 	struct smb_vc *vcp;
185 	struct smb_share *ssp = NULL;
186 	int error;
187 
188 	*vcpp = vcp = NULL;
189 
190 	error = smb_sm_lockvclist();
191 	if (error)
192 		return error;
193 	error = smb_sm_lookupint(vcspec, shspec, scred, vcpp);
194 	if (error == 0 || (vcspec->flags & SMBV_CREATE) == 0) {
195 		smb_sm_unlockvclist();
196 		return error;
197 	}
198 	error = smb_sm_lookupint(vcspec, NULL, scred, &vcp);
199 	if (error) {
200 		error = smb_vc_create(vcspec, scred, &vcp);
201 		if (error)
202 			goto out;
203 		error = smb_vc_connect(vcp, scred);
204 		if (error)
205 			goto out;
206 	}
207 	if (shspec == NULL)
208 		goto out;
209 	error = smb_share_create(vcp, shspec, scred, &ssp);
210 	if (error)
211 		goto out;
212 	error = smb_smb_treeconnect(ssp, scred);
213 	if (error == 0)
214 		vcspec->ssp = ssp;
215 	else
216 		smb_share_put(ssp, scred);
217 out:
218 	smb_sm_unlockvclist();
219 	if (error == 0)
220 		*vcpp = vcp;
221 	else if (vcp) {
222 		smb_vc_lock(vcp);
223 		smb_vc_put(vcp, scred);
224 	}
225 	return error;
226 }
227 
228 /*
229  * Common code for connection object
230  */
231 static void
smb_co_init(struct smb_connobj * cp,int level,char * ilockname,char * lockname)232 smb_co_init(struct smb_connobj *cp, int level, char *ilockname, char *lockname)
233 {
234 	SLIST_INIT(&cp->co_children);
235 	sx_init_flags(&cp->co_interlock, ilockname, SX_RECURSE);
236 	cv_init(&cp->co_lock, "smblock");
237 	cp->co_lockcnt = 0;
238 	cp->co_locker = NULL;
239 	cp->co_level = level;
240 	cp->co_usecount = 1;
241 	sx_xlock(&cp->co_interlock);
242 	smb_co_lock(cp);
243 	sx_unlock(&cp->co_interlock);
244 }
245 
246 static void
smb_co_done(struct smb_connobj * cp)247 smb_co_done(struct smb_connobj *cp)
248 {
249 
250 	sx_destroy(&cp->co_interlock);
251 	cv_destroy(&cp->co_lock);
252 	cp->co_locker = NULL;
253 	cp->co_flags = 0;
254 	cp->co_lockcnt = 0;
255 }
256 
257 static void
smb_co_gone(struct smb_connobj * cp,struct smb_cred * scred)258 smb_co_gone(struct smb_connobj *cp, struct smb_cred *scred)
259 {
260 	struct smb_connobj *parent;
261 
262 	if (cp->co_gone)
263 		cp->co_gone(cp, scred);
264 	parent = cp->co_parent;
265 	if (parent) {
266 		sx_xlock(&parent->co_interlock);
267 		smb_co_lock(parent);
268 		sx_unlock(&parent->co_interlock);
269 		SLIST_REMOVE(&parent->co_children, cp, smb_connobj, co_next);
270 		smb_co_put(parent, scred);
271 	}
272 	if (cp->co_free)
273 		cp->co_free(cp);
274 }
275 
276 void
smb_co_ref(struct smb_connobj * cp)277 smb_co_ref(struct smb_connobj *cp)
278 {
279 
280 	sx_xlock(&cp->co_interlock);
281 	cp->co_usecount++;
282 	sx_unlock(&cp->co_interlock);
283 }
284 
285 void
smb_co_rele(struct smb_connobj * cp,struct smb_cred * scred)286 smb_co_rele(struct smb_connobj *cp, struct smb_cred *scred)
287 {
288 
289 	sx_xlock(&cp->co_interlock);
290 	smb_co_unlock(cp);
291 	if (cp->co_usecount > 1) {
292 		cp->co_usecount--;
293 		sx_unlock(&cp->co_interlock);
294 		return;
295 	}
296 	if (cp->co_usecount == 0) {
297 		SMBERROR("negative use_count for object %d", cp->co_level);
298 		sx_unlock(&cp->co_interlock);
299 		return;
300 	}
301 	cp->co_usecount--;
302 	cp->co_flags |= SMBO_GONE;
303 	sx_unlock(&cp->co_interlock);
304 	smb_co_gone(cp, scred);
305 }
306 
307 int
smb_co_get(struct smb_connobj * cp,struct smb_cred * scred)308 smb_co_get(struct smb_connobj *cp, struct smb_cred *scred)
309 {
310 	int error;
311 
312 	MPASS(sx_xholder(&cp->co_interlock) == curthread);
313 	cp->co_usecount++;
314 	error = smb_co_lock(cp);
315 	if (error)
316 		cp->co_usecount--;
317 	return error;
318 }
319 
320 void
smb_co_put(struct smb_connobj * cp,struct smb_cred * scred)321 smb_co_put(struct smb_connobj *cp, struct smb_cred *scred)
322 {
323 
324 	sx_xlock(&cp->co_interlock);
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 	} else {
331 		SMBERROR("negative usecount");
332 	}
333 	smb_co_unlock(cp);
334 	sx_unlock(&cp->co_interlock);
335 	if ((cp->co_flags & SMBO_GONE) == 0)
336 		return;
337 	smb_co_gone(cp, scred);
338 }
339 
340 int
smb_co_lock(struct smb_connobj * cp)341 smb_co_lock(struct smb_connobj *cp)
342 {
343 
344 	MPASS(sx_xholder(&cp->co_interlock) == curthread);
345 	for (;;) {
346 		if (cp->co_flags & SMBO_GONE)
347 			return EINVAL;
348 		if (cp->co_locker == NULL) {
349 			cp->co_locker = curthread;
350 			return 0;
351 		}
352 		if (cp->co_locker == curthread) {
353 			cp->co_lockcnt++;
354 			return 0;
355 		}
356 		cv_wait(&cp->co_lock, &cp->co_interlock);
357 	}
358 }
359 
360 void
smb_co_unlock(struct smb_connobj * cp)361 smb_co_unlock(struct smb_connobj *cp)
362 {
363 
364 	MPASS(sx_xholder(&cp->co_interlock) == curthread);
365 	MPASS(cp->co_locker == curthread);
366 	if (cp->co_lockcnt != 0) {
367 		cp->co_lockcnt--;
368 		return;
369 	}
370 	cp->co_locker = NULL;
371 	cv_signal(&cp->co_lock);
372 }
373 
374 static void
smb_co_addchild(struct smb_connobj * parent,struct smb_connobj * child)375 smb_co_addchild(struct smb_connobj *parent, struct smb_connobj *child)
376 {
377 
378 	smb_co_ref(parent);
379 	SLIST_INSERT_HEAD(&parent->co_children, child, co_next);
380 	child->co_parent = parent;
381 }
382 
383 /*
384  * Session implementation
385  */
386 
387 int
smb_vc_create(struct smb_vcspec * vcspec,struct smb_cred * scred,struct smb_vc ** vcpp)388 smb_vc_create(struct smb_vcspec *vcspec,
389 	struct smb_cred *scred, struct smb_vc **vcpp)
390 {
391 	struct smb_vc *vcp;
392 	struct ucred *cred = scred->scr_cred;
393 	uid_t uid = vcspec->owner;
394 	gid_t gid = vcspec->group;
395 	uid_t realuid = cred->cr_uid;
396 	char *domain = vcspec->domain;
397 	int error, isroot;
398 
399 	isroot = smb_suser(cred) == 0;
400 	/*
401 	 * Only superuser can create VCs with different uid and gid
402 	 */
403 	if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot)
404 		return EPERM;
405 	if (gid != SMBM_ANY_GROUP && !groupmember(gid, cred) && !isroot)
406 		return EPERM;
407 
408 	vcp = smb_zmalloc(sizeof(*vcp), M_SMBCONN, M_WAITOK);
409 	smb_co_init(VCTOCP(vcp), SMBL_VC, "smb_vc ilock", "smb_vc");
410 	vcp->obj.co_free = smb_vc_free;
411 	vcp->obj.co_gone = smb_vc_gone;
412 	vcp->vc_number = smb_vcnext++;
413 	vcp->vc_timo = SMB_DEFRQTIMO;
414 	vcp->vc_smbuid = SMB_UID_UNKNOWN;
415 	vcp->vc_mode = vcspec->rights & SMBM_MASK;
416 	vcp->obj.co_flags = vcspec->flags & (SMBV_PRIVATE | SMBV_SINGLESHARE);
417 	vcp->vc_tdesc = &smb_tran_nbtcp_desc;
418 	vcp->vc_seqno = 0;
419 	vcp->vc_mackey = NULL;
420 	vcp->vc_mackeylen = 0;
421 
422 	if (uid == SMBM_ANY_OWNER)
423 		uid = realuid;
424 	if (gid == SMBM_ANY_GROUP)
425 		gid = cred->cr_groups[0];
426 	vcp->vc_uid = uid;
427 	vcp->vc_grp = gid;
428 
429 	smb_sl_init(&vcp->vc_stlock, "vcstlock");
430 	error = ENOMEM;
431 
432 	vcp->vc_paddr = sodupsockaddr(vcspec->sap, M_WAITOK);
433 	if (vcp->vc_paddr == NULL)
434 		goto fail;
435 	vcp->vc_laddr = sodupsockaddr(vcspec->lap, M_WAITOK);
436 	if (vcp->vc_laddr == NULL)
437 		goto fail;
438 	vcp->vc_pass = smb_strdup(vcspec->pass);
439 	if (vcp->vc_pass == NULL)
440 		goto fail;
441 	vcp->vc_domain = smb_strdup((domain && domain[0]) ? domain :
442 	    "NODOMAIN");
443 	if (vcp->vc_domain == NULL)
444 		goto fail;
445 	vcp->vc_srvname = smb_strdup(vcspec->srvname);
446 	if (vcp->vc_srvname == NULL)
447 		goto fail;
448 	vcp->vc_username = smb_strdup(vcspec->username);
449 	if (vcp->vc_username == NULL)
450 		goto fail;
451 	error = (int)iconv_open("tolower", vcspec->localcs, &vcp->vc_tolower);
452 	if (error)
453 		goto fail;
454 	error = (int)iconv_open("toupper", vcspec->localcs, &vcp->vc_toupper);
455 	if (error)
456 		goto fail;
457 	if (vcspec->servercs[0]) {
458 		error = (int)iconv_open(vcspec->servercs, vcspec->localcs,
459 		    &vcp->vc_cp_toserver);
460 		if (error)
461 			goto fail;
462 		error = (int)iconv_open(vcspec->localcs, vcspec->servercs,
463 		    &vcp->vc_cp_tolocal);
464 		if (error)
465 			goto fail;
466 		vcp->vc_toserver = vcp->vc_cp_toserver;
467 		vcp->vc_tolocal = vcp->vc_cp_tolocal;
468 		iconv_add(ENCODING_UNICODE, ENCODING_UNICODE, SMB_UNICODE_NAME);
469 		iconv_add(ENCODING_UNICODE, SMB_UNICODE_NAME, ENCODING_UNICODE);
470 		error = (int)iconv_open(SMB_UNICODE_NAME, vcspec->localcs,
471 		    &vcp->vc_ucs_toserver);
472 		if (!error) {
473 			error = (int)iconv_open(vcspec->localcs, SMB_UNICODE_NAME,
474 			    &vcp->vc_ucs_tolocal);
475 		}
476 		if (error) {
477 			if (vcp->vc_ucs_toserver)
478 				iconv_close(vcp->vc_ucs_toserver);
479 			vcp->vc_ucs_toserver = NULL;
480 			vcp->vc_ucs_tolocal = NULL;
481 		}
482 	}
483 	error = (int)smb_iod_create(vcp);
484 	if (error)
485 		goto fail;
486 	*vcpp = vcp;
487 	smb_co_addchild(&smb_vclist, VCTOCP(vcp));
488 	return (0);
489 
490  fail:
491 	smb_vc_put(vcp, scred);
492 	return (error);
493 }
494 
495 static void
smb_vc_free(struct smb_connobj * cp)496 smb_vc_free(struct smb_connobj *cp)
497 {
498 	struct smb_vc *vcp = CPTOVC(cp);
499 
500 	if (vcp->vc_iod)
501 		smb_iod_destroy(vcp->vc_iod);
502 	SMB_STRFREE(vcp->vc_username);
503 	SMB_STRFREE(vcp->vc_srvname);
504 	SMB_STRFREE(vcp->vc_pass);
505 	SMB_STRFREE(vcp->vc_domain);
506 	if (vcp->vc_mackey)
507 		free(vcp->vc_mackey, M_SMBTEMP);
508 	if (vcp->vc_paddr)
509 		free(vcp->vc_paddr, M_SONAME);
510 	if (vcp->vc_laddr)
511 		free(vcp->vc_laddr, M_SONAME);
512 	if (vcp->vc_tolower)
513 		iconv_close(vcp->vc_tolower);
514 	if (vcp->vc_toupper)
515 		iconv_close(vcp->vc_toupper);
516 	if (vcp->vc_tolocal)
517 		vcp->vc_tolocal = NULL;
518 	if (vcp->vc_toserver)
519 		vcp->vc_toserver = NULL;
520 	if (vcp->vc_cp_tolocal)
521 		iconv_close(vcp->vc_cp_tolocal);
522 	if (vcp->vc_cp_toserver)
523 		iconv_close(vcp->vc_cp_toserver);
524 	if (vcp->vc_ucs_tolocal)
525 		iconv_close(vcp->vc_ucs_tolocal);
526 	if (vcp->vc_ucs_toserver)
527 		iconv_close(vcp->vc_ucs_toserver);
528 	smb_co_done(VCTOCP(vcp));
529 	smb_sl_destroy(&vcp->vc_stlock);
530 	free(vcp, M_SMBCONN);
531 }
532 
533 /*
534  * Called when use count of VC dropped to zero.
535  */
536 static void
smb_vc_gone(struct smb_connobj * cp,struct smb_cred * scred)537 smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred)
538 {
539 	struct smb_vc *vcp = CPTOVC(cp);
540 
541 	smb_vc_disconnect(vcp);
542 }
543 
544 void
smb_vc_ref(struct smb_vc * vcp)545 smb_vc_ref(struct smb_vc *vcp)
546 {
547 	smb_co_ref(VCTOCP(vcp));
548 }
549 
550 void
smb_vc_rele(struct smb_vc * vcp,struct smb_cred * scred)551 smb_vc_rele(struct smb_vc *vcp, struct smb_cred *scred)
552 {
553 	smb_co_rele(VCTOCP(vcp), scred);
554 }
555 
556 int
smb_vc_get(struct smb_vc * vcp,struct smb_cred * scred)557 smb_vc_get(struct smb_vc *vcp, struct smb_cred *scred)
558 {
559 	struct smb_connobj *cp;
560 	int error;
561 
562 	cp = VCTOCP(vcp);
563 	sx_xlock(&cp->co_interlock);
564 	error = smb_co_get(cp, scred);
565 	sx_unlock(&cp->co_interlock);
566 	return error;
567 }
568 
569 void
smb_vc_put(struct smb_vc * vcp,struct smb_cred * scred)570 smb_vc_put(struct smb_vc *vcp, struct smb_cred *scred)
571 {
572 	smb_co_put(VCTOCP(vcp), scred);
573 }
574 
575 int
smb_vc_lock(struct smb_vc * vcp)576 smb_vc_lock(struct smb_vc *vcp)
577 {
578 	struct smb_connobj *cp;
579 	int error;
580 
581 	cp = VCTOCP(vcp);
582 	sx_xlock(&cp->co_interlock);
583 	error = smb_co_lock(cp);
584 	sx_unlock(&cp->co_interlock);
585 	return error;
586 }
587 
588 void
smb_vc_unlock(struct smb_vc * vcp)589 smb_vc_unlock(struct smb_vc *vcp)
590 {
591 
592 	struct smb_connobj *cp;
593 
594 	cp = VCTOCP(vcp);
595 	sx_xlock(&cp->co_interlock);
596 	smb_co_unlock(cp);
597 	sx_unlock(&cp->co_interlock);
598 }
599 
600 int
smb_vc_access(struct smb_vc * vcp,struct smb_cred * scred,mode_t mode)601 smb_vc_access(struct smb_vc *vcp, struct smb_cred *scred, mode_t mode)
602 {
603 	struct ucred *cred = scred->scr_cred;
604 
605 	if (smb_suser(cred) == 0 || cred->cr_uid == vcp->vc_uid)
606 		return 0;
607 	mode >>= 3;
608 	if (!groupmember(vcp->vc_grp, cred))
609 		mode >>= 3;
610 	return (vcp->vc_mode & mode) == mode ? 0 : EACCES;
611 }
612 
613 static int
smb_vc_cmpshare(struct smb_share * ssp,struct smb_sharespec * dp)614 smb_vc_cmpshare(struct smb_share *ssp, struct smb_sharespec *dp)
615 {
616 	int exact = 1;
617 
618 	if (strcmp(ssp->ss_name, dp->name) != 0)
619 		return 1;
620 	if (dp->owner != SMBM_ANY_OWNER) {
621 		if (ssp->ss_uid != dp->owner)
622 			return 1;
623 	} else
624 		exact = 0;
625 	if (dp->group != SMBM_ANY_GROUP) {
626 		if (ssp->ss_grp != dp->group)
627 			return 1;
628 	} else
629 		exact = 0;
630 
631 	if (dp->mode & SMBM_EXACT) {
632 		if (!exact)
633 			return 1;
634 		return (dp->mode & SMBM_MASK) == ssp->ss_mode ? 0 : 1;
635 	}
636 	if (smb_share_access(ssp, dp->scred, dp->mode) != 0)
637 		return 1;
638 	return 0;
639 }
640 
641 /*
642  * Lookup share in the given VC. Share referenced and locked on return.
643  * VC expected to be locked on entry and will be left locked on exit.
644  */
645 int
smb_vc_lookupshare(struct smb_vc * vcp,struct smb_sharespec * dp,struct smb_cred * scred,struct smb_share ** sspp)646 smb_vc_lookupshare(struct smb_vc *vcp, struct smb_sharespec *dp,
647 	struct smb_cred *scred,	struct smb_share **sspp)
648 {
649 	struct smb_connobj *scp = NULL;
650 	struct smb_share *ssp = NULL;
651 	int error;
652 
653 	*sspp = NULL;
654 	dp->scred = scred;
655 	SMBCO_FOREACH(scp, VCTOCP(vcp)) {
656 		ssp = (struct smb_share *)scp;
657 		error = smb_share_lock(ssp);
658 		if (error)
659 			continue;
660 		if (smb_vc_cmpshare(ssp, dp) == 0)
661 			break;
662 		smb_share_unlock(ssp);
663 	}
664 	if (ssp) {
665 		smb_share_ref(ssp);
666 		*sspp = ssp;
667 		error = 0;
668 	} else
669 		error = ENOENT;
670 	return error;
671 }
672 
673 int
smb_vc_connect(struct smb_vc * vcp,struct smb_cred * scred)674 smb_vc_connect(struct smb_vc *vcp, struct smb_cred *scred)
675 {
676 
677 	return smb_iod_request(vcp->vc_iod, SMBIOD_EV_CONNECT | SMBIOD_EV_SYNC, NULL);
678 }
679 
680 /*
681  * Destroy VC to server, invalidate shares linked with it.
682  * Transport should be locked on entry.
683  */
684 int
smb_vc_disconnect(struct smb_vc * vcp)685 smb_vc_disconnect(struct smb_vc *vcp)
686 {
687 
688 	if (vcp->vc_iod != NULL)
689 		smb_iod_request(vcp->vc_iod, SMBIOD_EV_DISCONNECT |
690 		    SMBIOD_EV_SYNC, NULL);
691 	return 0;
692 }
693 
694 static char smb_emptypass[] = "";
695 
696 const char *
smb_vc_getpass(struct smb_vc * vcp)697 smb_vc_getpass(struct smb_vc *vcp)
698 {
699 	if (vcp->vc_pass)
700 		return vcp->vc_pass;
701 	return smb_emptypass;
702 }
703 
704 static int
smb_vc_getinfo(struct smb_vc * vcp,struct smb_vc_info * vip)705 smb_vc_getinfo(struct smb_vc *vcp, struct smb_vc_info *vip)
706 {
707 	bzero(vip, sizeof(struct smb_vc_info));
708 	vip->itype = SMB_INFO_VC;
709 	vip->usecount = vcp->obj.co_usecount;
710 	vip->uid = vcp->vc_uid;
711 	vip->gid = vcp->vc_grp;
712 	vip->mode = vcp->vc_mode;
713 	vip->flags = vcp->obj.co_flags;
714 	vip->sopt = vcp->vc_sopt;
715 	vip->iodstate = vcp->vc_iod->iod_state;
716 	bzero(&vip->sopt.sv_skey, sizeof(vip->sopt.sv_skey));
717 	snprintf(vip->srvname, sizeof(vip->srvname), "%s", vcp->vc_srvname);
718 	snprintf(vip->vcname, sizeof(vip->vcname), "%s", vcp->vc_username);
719 	return 0;
720 }
721 
722 u_short
smb_vc_nextmid(struct smb_vc * vcp)723 smb_vc_nextmid(struct smb_vc *vcp)
724 {
725 	u_short r;
726 
727 	sx_xlock(&vcp->obj.co_interlock);
728 	r = vcp->vc_mid++;
729 	sx_unlock(&vcp->obj.co_interlock);
730 	return r;
731 }
732 
733 /*
734  * Share implementation
735  */
736 /*
737  * Allocate share structure and attach it to the given VC
738  * Connection expected to be locked on entry. Share will be returned
739  * in locked state.
740  */
741 int
smb_share_create(struct smb_vc * vcp,struct smb_sharespec * shspec,struct smb_cred * scred,struct smb_share ** sspp)742 smb_share_create(struct smb_vc *vcp, struct smb_sharespec *shspec,
743 	struct smb_cred *scred, struct smb_share **sspp)
744 {
745 	struct smb_share *ssp;
746 	struct ucred *cred = scred->scr_cred;
747 	uid_t realuid = cred->cr_uid;
748 	uid_t uid = shspec->owner;
749 	gid_t gid = shspec->group;
750 	int error, isroot;
751 
752 	isroot = smb_suser(cred) == 0;
753 	/*
754 	 * Only superuser can create shares with different uid and gid
755 	 */
756 	if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot)
757 		return EPERM;
758 	if (gid != SMBM_ANY_GROUP && !groupmember(gid, cred) && !isroot)
759 		return EPERM;
760 	error = smb_vc_lookupshare(vcp, shspec, scred, &ssp);
761 	if (!error) {
762 		smb_share_put(ssp, scred);
763 		return EEXIST;
764 	}
765 	if (uid == SMBM_ANY_OWNER)
766 		uid = realuid;
767 	if (gid == SMBM_ANY_GROUP)
768 		gid = cred->cr_groups[0];
769 	ssp = smb_zmalloc(sizeof(*ssp), M_SMBCONN, M_WAITOK);
770 	smb_co_init(SSTOCP(ssp), SMBL_SHARE, "smbss ilock", "smbss");
771 	ssp->obj.co_free = smb_share_free;
772 	ssp->obj.co_gone = smb_share_gone;
773 	smb_sl_init(&ssp->ss_stlock, "ssstlock");
774 	ssp->ss_name = smb_strdup(shspec->name);
775 	if (shspec->pass && shspec->pass[0])
776 		ssp->ss_pass = smb_strdup(shspec->pass);
777 	ssp->ss_type = shspec->stype;
778 	ssp->ss_tid = SMB_TID_UNKNOWN;
779 	ssp->ss_uid = uid;
780 	ssp->ss_grp = gid;
781 	ssp->ss_mode = shspec->rights & SMBM_MASK;
782 	smb_co_addchild(VCTOCP(vcp), SSTOCP(ssp));
783 	*sspp = ssp;
784 	return 0;
785 }
786 
787 static void
smb_share_free(struct smb_connobj * cp)788 smb_share_free(struct smb_connobj *cp)
789 {
790 	struct smb_share *ssp = CPTOSS(cp);
791 
792 	SMB_STRFREE(ssp->ss_name);
793 	SMB_STRFREE(ssp->ss_pass);
794 	smb_sl_destroy(&ssp->ss_stlock);
795 	smb_co_done(SSTOCP(ssp));
796 	free(ssp, M_SMBCONN);
797 }
798 
799 static void
smb_share_gone(struct smb_connobj * cp,struct smb_cred * scred)800 smb_share_gone(struct smb_connobj *cp, struct smb_cred *scred)
801 {
802 	struct smb_share *ssp = CPTOSS(cp);
803 
804 	smb_smb_treedisconnect(ssp, scred);
805 }
806 
807 void
smb_share_ref(struct smb_share * ssp)808 smb_share_ref(struct smb_share *ssp)
809 {
810 	smb_co_ref(SSTOCP(ssp));
811 }
812 
813 void
smb_share_rele(struct smb_share * ssp,struct smb_cred * scred)814 smb_share_rele(struct smb_share *ssp, struct smb_cred *scred)
815 {
816 	smb_co_rele(SSTOCP(ssp), scred);
817 }
818 
819 int
smb_share_get(struct smb_share * ssp,struct smb_cred * scred)820 smb_share_get(struct smb_share *ssp, struct smb_cred *scred)
821 {
822 	struct smb_connobj *cp = SSTOCP(ssp);
823 	int error;
824 
825 	sx_xlock(&cp->co_interlock);
826 	error = smb_co_get(cp, scred);
827 	sx_unlock(&cp->co_interlock);
828 	return error;
829 }
830 
831 void
smb_share_put(struct smb_share * ssp,struct smb_cred * scred)832 smb_share_put(struct smb_share *ssp, struct smb_cred *scred)
833 {
834 
835 	smb_co_put(SSTOCP(ssp), scred);
836 }
837 
838 int
smb_share_lock(struct smb_share * ssp)839 smb_share_lock(struct smb_share *ssp)
840 {
841 	struct smb_connobj *cp;
842 	int error;
843 
844 	cp = SSTOCP(ssp);
845 	sx_xlock(&cp->co_interlock);
846 	error = smb_co_lock(cp);
847 	sx_unlock(&cp->co_interlock);
848 	return error;
849 }
850 
851 void
smb_share_unlock(struct smb_share * ssp)852 smb_share_unlock(struct smb_share *ssp)
853 {
854 	struct smb_connobj *cp;
855 
856 	cp = SSTOCP(ssp);
857 	sx_xlock(&cp->co_interlock);
858 	smb_co_unlock(cp);
859 	sx_unlock(&cp->co_interlock);
860 }
861 
862 int
smb_share_access(struct smb_share * ssp,struct smb_cred * scred,mode_t mode)863 smb_share_access(struct smb_share *ssp, struct smb_cred *scred, mode_t mode)
864 {
865 	struct ucred *cred = scred->scr_cred;
866 
867 	if (smb_suser(cred) == 0 || cred->cr_uid == ssp->ss_uid)
868 		return 0;
869 	mode >>= 3;
870 	if (!groupmember(ssp->ss_grp, cred))
871 		mode >>= 3;
872 	return (ssp->ss_mode & mode) == mode ? 0 : EACCES;
873 }
874 
875 void
smb_share_invalidate(struct smb_share * ssp)876 smb_share_invalidate(struct smb_share *ssp)
877 {
878 	ssp->ss_tid = SMB_TID_UNKNOWN;
879 }
880 
881 int
smb_share_valid(struct smb_share * ssp)882 smb_share_valid(struct smb_share *ssp)
883 {
884 	return ssp->ss_tid != SMB_TID_UNKNOWN &&
885 	    ssp->ss_vcgenid == SSTOVC(ssp)->vc_genid;
886 }
887 
888 const char*
smb_share_getpass(struct smb_share * ssp)889 smb_share_getpass(struct smb_share *ssp)
890 {
891 	struct smb_vc *vcp;
892 
893 	if (ssp->ss_pass)
894 		return ssp->ss_pass;
895 	vcp = SSTOVC(ssp);
896 	if (vcp->vc_pass)
897 		return vcp->vc_pass;
898 	return smb_emptypass;
899 }
900 
901 static int
smb_share_getinfo(struct smb_share * ssp,struct smb_share_info * sip)902 smb_share_getinfo(struct smb_share *ssp, struct smb_share_info *sip)
903 {
904 	bzero(sip, sizeof(struct smb_share_info));
905 	sip->itype = SMB_INFO_SHARE;
906 	sip->usecount = ssp->obj.co_usecount;
907 	sip->tid  = ssp->ss_tid;
908 	sip->type= ssp->ss_type;
909 	sip->uid = ssp->ss_uid;
910 	sip->gid = ssp->ss_grp;
911 	sip->mode= ssp->ss_mode;
912 	sip->flags = ssp->obj.co_flags;
913 	snprintf(sip->sname, sizeof(sip->sname), "%s", ssp->ss_name);
914 	return 0;
915 }
916 
917 /*
918  * Dump an entire tree into sysctl call
919  */
920 static int
smb_sysctl_treedump(SYSCTL_HANDLER_ARGS)921 smb_sysctl_treedump(SYSCTL_HANDLER_ARGS)
922 {
923 	struct smb_connobj *scp1, *scp2;
924 	struct smb_vc *vcp;
925 	struct smb_share *ssp;
926 	struct smb_vc_info vci;
927 	struct smb_share_info ssi;
928 	int error, itype;
929 
930 	error = sysctl_wire_old_buffer(req, 0);
931 	if (error)
932 		return (error);
933 	error = smb_sm_lockvclist();
934 	if (error)
935 		return error;
936 	SMBCO_FOREACH(scp1, &smb_vclist) {
937 		vcp = (struct smb_vc *)scp1;
938 		error = smb_vc_lock(vcp);
939 		if (error)
940 			continue;
941 		smb_vc_getinfo(vcp, &vci);
942 		error = SYSCTL_OUT(req, &vci, sizeof(struct smb_vc_info));
943 		if (error) {
944 			smb_vc_unlock(vcp);
945 			break;
946 		}
947 		SMBCO_FOREACH(scp2, VCTOCP(vcp)) {
948 			ssp = (struct smb_share *)scp2;
949 			error = smb_share_lock(ssp);
950 			if (error) {
951 				error = 0;
952 				continue;
953 			}
954 			smb_share_getinfo(ssp, &ssi);
955 			smb_share_unlock(ssp);
956 			error = SYSCTL_OUT(req, &ssi, sizeof(struct smb_share_info));
957 			if (error)
958 				break;
959 		}
960 		smb_vc_unlock(vcp);
961 		if (error)
962 			break;
963 	}
964 	if (!error) {
965 		itype = SMB_INFO_NONE;
966 		error = SYSCTL_OUT(req, &itype, sizeof(itype));
967 	}
968 	smb_sm_unlockvclist();
969 	return error;
970 }
971