1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
24 */
25
26 #include <assert.h>
27 #include <syslog.h>
28 #include <door.h>
29 #include <fcntl.h>
30 #include <string.h>
31 #include <strings.h>
32 #include <stdlib.h>
33 #include <unistd.h>
34 #include <errno.h>
35 #include <sys/mman.h>
36 #include <smb/wintypes.h>
37 #include <smbsrv/libsmb.h>
38 #include <smbsrv/smb_door.h>
39
40 static int smb_door_call(uint32_t, void *, xdrproc_t, void *, xdrproc_t);
41 static int smb_door_call_private(int, smb_doorarg_t *);
42 static int smb_door_encode(smb_doorarg_t *, uint32_t);
43 static int smb_door_decode(smb_doorarg_t *);
44 static void smb_door_sethdr(smb_doorhdr_t *, uint32_t, uint32_t);
45 static boolean_t smb_door_chkhdr(smb_doorarg_t *, smb_doorhdr_t *);
46 static void smb_door_free(door_arg_t *arg);
47
48 /*
49 * Given a SID, make a door call to get the associated name.
50 *
51 * Returns 0 if the door call is successful, otherwise -1.
52 *
53 * If 0 is returned, the lookup result will be available in a_status.
54 * NT_STATUS_SUCCESS The SID was mapped to a name.
55 * NT_STATUS_NONE_MAPPED The SID could not be mapped to a name.
56 */
57 int
58 smb_lookup_sid(const char *sid, lsa_account_t *acct)
59 {
60 int rc;
61
62 assert((sid != NULL) && (acct != NULL));
63
64 bzero(acct, sizeof (lsa_account_t));
65 (void) strlcpy(acct->a_sid, sid, SMB_SID_STRSZ);
66
67 rc = smb_door_call(SMB_DR_LOOKUP_SID, acct, lsa_account_xdr,
68 acct, lsa_account_xdr);
69
70 if (rc != 0)
71 syslog(LOG_DEBUG, "smb_lookup_sid: %m");
72 return (rc);
73 }
74
75 /*
76 * Given a name, make a door call to get the associated SID.
77 *
78 * Returns 0 if the door call is successful, otherwise -1.
79 *
80 * If 0 is returned, the lookup result will be available in a_status.
81 * NT_STATUS_SUCCESS The name was mapped to a SID.
82 * NT_STATUS_NONE_MAPPED The name could not be mapped to a SID.
83 */
84 int
85 smb_lookup_name(const char *name, sid_type_t sidtype, lsa_account_t *acct)
86 {
87 char tmp[MAXNAMELEN];
88 char *dp = NULL;
89 char *np = NULL;
90 int rc;
91
92 assert((name != NULL) && (acct != NULL));
93
94 (void) strlcpy(tmp, name, MAXNAMELEN);
95 smb_name_parse(tmp, &np, &dp);
96
97 bzero(acct, sizeof (lsa_account_t));
98 acct->a_sidtype = sidtype;
99
100 if (dp != NULL && np != NULL) {
101 (void) strlcpy(acct->a_domain, dp, MAXNAMELEN);
102 (void) strlcpy(acct->a_name, np, MAXNAMELEN);
103 } else {
104 (void) strlcpy(acct->a_name, name, MAXNAMELEN);
105 }
106
107 rc = smb_door_call(SMB_DR_LOOKUP_NAME, acct, lsa_account_xdr,
108 acct, lsa_account_xdr);
109
110 if (rc != 0)
111 syslog(LOG_DEBUG, "smb_lookup_name: %m");
112 return (rc);
113 }
114
115 int
116 smb_join(smb_joininfo_t *jdi, smb_joinres_t *jres)
117 {
118 int rc;
119
120 rc = smb_door_call(SMB_DR_JOIN, jdi, smb_joininfo_xdr,
121 jres, smb_joinres_xdr);
122
123 if (rc != 0) {
124 /*
125 * This usually means the SMB service is not running.
126 */
127 syslog(LOG_DEBUG, "smb_join: %m");
128 jres->status = NT_STATUS_SERVER_DISABLED;
129 return (rc);
130 }
131
132 return (0);
133 }
134
135 /*
136 * Get information about the Domain Controller in the joined resource domain.
137 *
138 * Returns NT status codes.
139 */
140 uint32_t
141 smb_get_dcinfo(char *namebuf, uint32_t namebuflen, smb_inaddr_t *ipaddr)
142 {
143 smb_string_t dcname;
144 struct hostent *h;
145 int rc;
146
147 assert((namebuf != NULL) && (namebuflen != 0));
148 *namebuf = '\0';
149 bzero(&dcname, sizeof (smb_string_t));
150
151 rc = smb_door_call(SMB_DR_GET_DCINFO, NULL, NULL,
152 &dcname, smb_string_xdr);
153
154 if (rc != 0) {
155 syslog(LOG_DEBUG, "smb_get_dcinfo: %m");
156 if (dcname.buf)
157 xdr_free(smb_string_xdr, (char *)&dcname);
158 return (NT_STATUS_INTERNAL_ERROR);
159 }
160
161 if (dcname.buf) {
162 (void) strlcpy(namebuf, dcname.buf, namebuflen);
163
164 if ((h = smb_gethostbyname(dcname.buf, &rc)) == NULL) {
165 bzero(ipaddr, sizeof (smb_inaddr_t));
166 } else {
167 (void) memcpy(ipaddr, h->h_addr, h->h_length);
168 ipaddr->a_family = h->h_addrtype;
169 freehostent(h);
170 }
171 xdr_free(smb_string_xdr, (char *)&dcname);
172 }
173
174 return (NT_STATUS_SUCCESS);
175 }
176
177 bool_t
178 smb_joininfo_xdr(XDR *xdrs, smb_joininfo_t *objp)
179 {
180 if (!xdr_vector(xdrs, (char *)objp->domain_name, MAXHOSTNAMELEN,
181 sizeof (char), (xdrproc_t)xdr_char))
182 return (FALSE);
183
184 if (!xdr_vector(xdrs, (char *)objp->domain_username,
185 SMB_USERNAME_MAXLEN + 1, sizeof (char), (xdrproc_t)xdr_char))
186 return (FALSE);
187
188 if (!xdr_vector(xdrs, (char *)objp->domain_passwd,
189 SMB_PASSWD_MAXLEN + 1, sizeof (char), (xdrproc_t)xdr_char))
190 return (FALSE);
191
192 if (!xdr_uint32_t(xdrs, &objp->mode))
193 return (FALSE);
194
195 return (TRUE);
196 }
197
198 bool_t
199 smb_joinres_xdr(XDR *xdrs, smb_joinres_t *objp)
200 {
201
202 if (!xdr_uint32_t(xdrs, &objp->status))
203 return (FALSE);
204
205 if (!xdr_int(xdrs, &objp->join_err))
206 return (FALSE);
207
208 if (!xdr_vector(xdrs, (char *)objp->dc_name, MAXHOSTNAMELEN,
209 sizeof (char), (xdrproc_t)xdr_char))
210 return (FALSE);
211
212 return (TRUE);
213 }
214
215 /*
216 * Parameters:
217 * fqdn (input) - fully-qualified domain name
218 * buf (output) - fully-qualified hostname of the AD server found
219 * by this function.
220 * buflen (input) - length of the 'buf'
221 *
222 * Return:
223 * B_TRUE if an AD server is found. Otherwise, returns B_FALSE;
224 *
225 * The buffer passed in should be big enough to hold a fully-qualified
226 * hostname (MAXHOSTNAMELEN); otherwise, a truncated string will be
227 * returned. On error, an empty string will be returned.
228 */
229 boolean_t
230 smb_find_ads_server(char *fqdn, char *buf, int buflen)
231 {
232 smb_string_t server;
233 smb_string_t domain;
234 boolean_t found = B_FALSE;
235 int rc;
236
237 if (fqdn == NULL || buf == NULL) {
238 if (buf)
239 *buf = '\0';
240 return (B_FALSE);
241 }
242
243 bzero(&server, sizeof (smb_string_t));
244 *buf = '\0';
245
246 domain.buf = fqdn;
247
248 rc = smb_door_call(SMB_DR_ADS_FIND_HOST, &domain, smb_string_xdr,
249 &server, smb_string_xdr);
250
251 if (rc != 0)
252 syslog(LOG_DEBUG, "smb_find_ads_server: %m");
253
254 if (server.buf != NULL) {
255 if (*server.buf != '\0') {
256 (void) strlcpy(buf, server.buf, buflen);
257 found = B_TRUE;
258 }
259
260 xdr_free(smb_string_xdr, (char *)&server);
261 }
262
263 return (found);
264 }
265
266 void
267 smb_notify_dc_changed(void)
268 {
269 int rc;
270
271 rc = smb_door_call(SMB_DR_NOTIFY_DC_CHANGED,
272 NULL, NULL, NULL, NULL);
273
274 if (rc != 0)
275 syslog(LOG_DEBUG, "smb_notify_dc_changed: %m");
276 }
277
278
279 /*
280 * After a successful door call the local door_arg->data_ptr is assigned
281 * to the caller's arg->rbuf so that arg has references to both input and
282 * response buffers, which is required by smb_door_free.
283 *
284 * On success, the object referenced by rsp_data will have been populated
285 * by passing rbuf through the rsp_xdr function.
286 */
287 static int
288 smb_door_call(uint32_t cmd, void *req_data, xdrproc_t req_xdr,
289 void *rsp_data, xdrproc_t rsp_xdr)
290 {
291 smb_doorarg_t da;
292 int fd;
293 int rc;
294 char *door_name;
295
296 bzero(&da, sizeof (smb_doorarg_t));
297 da.da_opcode = cmd;
298 da.da_opname = smb_doorhdr_opname(cmd);
299 da.da_req_xdr = req_xdr;
300 da.da_rsp_xdr = rsp_xdr;
301 da.da_req_data = req_data;
302 da.da_rsp_data = rsp_data;
303
304 if ((req_data == NULL && req_xdr != NULL) ||
305 (rsp_data == NULL && rsp_xdr != NULL)) {
306 errno = EINVAL;
307 syslog(LOG_DEBUG, "smb_door_call[%s]: %m", da.da_opname);
308 return (-1);
309 }
310
311 door_name = getenv("SMBD_DOOR_NAME");
312 if (door_name == NULL)
313 door_name = SMBD_DOOR_NAME;
314
315 if ((fd = open(door_name, O_RDONLY)) < 0) {
316 syslog(LOG_DEBUG, "smb_door_call[%s]: %m", da.da_opname);
317 return (-1);
318 }
319
320 if (smb_door_encode(&da, cmd) != 0) {
321 syslog(LOG_DEBUG, "smb_door_call[%s]: %m", da.da_opname);
322 (void) close(fd);
323 return (-1);
324 }
325
326 if (smb_door_call_private(fd, &da) != 0) {
327 syslog(LOG_DEBUG, "smb_door_call[%s]: %m", da.da_opname);
328 smb_door_free(&da.da_arg);
329 (void) close(fd);
330 return (-1);
331 }
332
333 if ((rc = smb_door_decode(&da)) != 0)
334 syslog(LOG_DEBUG, "smb_door_call[%s]: %m", da.da_opname);
335 smb_door_free(&da.da_arg);
336 (void) close(fd);
337 return (rc);
338 }
339
340 /*
341 * We use a copy of the door arg because doorfs may change data_ptr
342 * and we want to detect that when freeing the door buffers. After
343 * this call, response data must be referenced via rbuf and rsize.
344 */
345 static int
346 smb_door_call_private(int fd, smb_doorarg_t *da)
347 {
348 door_arg_t door_arg;
349 int rc;
350 int i;
351
352 bcopy(&da->da_arg, &door_arg, sizeof (door_arg_t));
353
354 for (i = 0; i < SMB_DOOR_CALL_RETRIES; ++i) {
355 errno = 0;
356
357 if ((rc = door_call(fd, &door_arg)) == 0)
358 break;
359
360 if (errno != EAGAIN && errno != EINTR)
361 return (-1);
362 }
363
364 if (rc != 0 || door_arg.data_size == 0 || door_arg.rsize == 0) {
365 if (errno == 0)
366 errno = EIO;
367 return (-1);
368 }
369
370 da->da_arg.rbuf = door_arg.data_ptr;
371 da->da_arg.rsize = door_arg.rsize;
372 return (rc);
373 }
374
375 static int
376 smb_door_encode(smb_doorarg_t *da, uint32_t cmd)
377 {
378 XDR xdrs;
379 char *buf;
380 uint32_t buflen;
381
382 buflen = xdr_sizeof(smb_doorhdr_xdr, &da->da_hdr);
383 if (da->da_req_xdr != NULL)
384 buflen += xdr_sizeof(da->da_req_xdr, da->da_req_data);
385
386 smb_door_sethdr(&da->da_hdr, cmd, buflen);
387
388 if ((buf = malloc(buflen)) == NULL)
389 return (-1);
390
391 xdrmem_create(&xdrs, buf, buflen, XDR_ENCODE);
392
393 if (!smb_doorhdr_xdr(&xdrs, &da->da_hdr)) {
394 errno = EPROTO;
395 free(buf);
396 xdr_destroy(&xdrs);
397 return (-1);
398 }
399
400 if (da->da_req_xdr != NULL) {
401 if (!da->da_req_xdr(&xdrs, da->da_req_data)) {
402 errno = EPROTO;
403 free(buf);
404 xdr_destroy(&xdrs);
405 return (-1);
406 }
407 }
408
409 da->da_arg.data_ptr = buf;
410 da->da_arg.data_size = buflen;
411 da->da_arg.desc_ptr = NULL;
412 da->da_arg.desc_num = 0;
413 da->da_arg.rbuf = buf;
414 da->da_arg.rsize = buflen;
415
416 xdr_destroy(&xdrs);
417 return (0);
418 }
419
420 /*
421 * Decode the response in rbuf and rsize.
422 */
423 static int
424 smb_door_decode(smb_doorarg_t *da)
425 {
426 XDR xdrs;
427 smb_doorhdr_t hdr;
428 char *rbuf = da->da_arg.rbuf;
429 uint32_t rsize = da->da_arg.rsize;
430
431 if (rbuf == NULL || rsize == 0) {
432 errno = EINVAL;
433 return (-1);
434 }
435
436 xdrmem_create(&xdrs, rbuf, rsize, XDR_DECODE);
437
438 if (!smb_doorhdr_xdr(&xdrs, &hdr)) {
439 errno = EPROTO;
440 xdr_destroy(&xdrs);
441 return (-1);
442 }
443
444 if (!smb_door_chkhdr(da, &hdr)) {
445 errno = EPROTO;
446 xdr_destroy(&xdrs);
447 return (-1);
448 }
449
450 if (da->da_rsp_xdr != NULL) {
451 if (!da->da_rsp_xdr(&xdrs, da->da_rsp_data)) {
452 errno = EPROTO;
453 xdr_destroy(&xdrs);
454 return (-1);
455 }
456 }
457
458 xdr_destroy(&xdrs);
459 return (0);
460 }
461
462 static void
463 smb_door_sethdr(smb_doorhdr_t *hdr, uint32_t cmd, uint32_t datalen)
464 {
465 bzero(hdr, sizeof (smb_doorhdr_t));
466 hdr->dh_magic = SMB_DOOR_HDR_MAGIC;
467 hdr->dh_flags = SMB_DF_USERSPACE;
468 hdr->dh_op = cmd;
469 hdr->dh_txid = smb_get_txid();
470 hdr->dh_datalen = datalen;
471 hdr->dh_door_rc = SMB_DOP_NOT_CALLED;
472 }
473
474 static boolean_t
475 smb_door_chkhdr(smb_doorarg_t *da, smb_doorhdr_t *hdr)
476 {
477 if ((hdr->dh_magic != SMB_DOOR_HDR_MAGIC) ||
478 (hdr->dh_op != da->da_hdr.dh_op) ||
479 (hdr->dh_txid != da->da_hdr.dh_txid)) {
480 syslog(LOG_DEBUG, "smb_door_chkhdr[%s]: invalid header",
481 da->da_opname);
482 return (B_FALSE);
483 }
484
485 if (hdr->dh_door_rc != SMB_DOP_SUCCESS) {
486 syslog(LOG_DEBUG, "smb_door_chkhdr[%s]: call status=%d",
487 da->da_opname, hdr->dh_door_rc);
488 return (B_FALSE);
489 }
490
491 return (B_TRUE);
492 }
493
494 /*
495 * Free resources allocated for a door call. If the result buffer provided
496 * by the client is too small, doorfs will have allocated a new buffer,
497 * which must be unmapped here.
498 *
499 * This function must be called to free both the argument and result door
500 * buffers regardless of the status of the door call.
501 */
502 static void
503 smb_door_free(door_arg_t *arg)
504 {
505 if (arg->rbuf && (arg->rbuf != arg->data_ptr))
506 (void) munmap(arg->rbuf, arg->rsize);
507
508 free(arg->data_ptr);
509 }