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 2018 Nexenta Systems, Inc. All rights reserved.
24 */
25
26 /*
27 * SMB server interface to idmap
28 * (smb_idmap_get..., smb_idmap_batch_...)
29 *
30 * There are three implementations of this interface.
31 * This is the libsmb version of these routines. See also:
32 * $SRC/uts/common/fs/smbsrv/smb_idmap.c
33 * $SRC/lib/smbsrv/libfksmbsrv/common/fksmb_idmap.c
34 *
35 * There are enough differences (relative to the code size)
36 * that it's more trouble than it's worth to merge them.
37 *
38 * This one differs from the others in that it:
39 * calls idmap interfaces (libidmap)
40 * domain SIDs returned are allocated
41 */
42
43 #include <syslog.h>
44 #include <strings.h>
45 #include <smbsrv/libsmb.h>
46
47 static int smb_idmap_batch_binsid(smb_idmap_batch_t *sib);
48
49 /*
50 * Report an idmap error.
51 */
52 void
53 smb_idmap_check(const char *s, idmap_stat stat)
54 {
55 if (stat != IDMAP_SUCCESS) {
56 if (s == NULL)
57 s = "smb_idmap_check";
58
59 syslog(LOG_ERR, "%s: %s", s, idmap_stat2string(stat));
60 }
61 }
62
63 /*
64 * smb_idmap_getsid
65 *
66 * Tries to get a mapping for the given uid/gid
67 * Allocates ->sim_domsid
68 */
69 idmap_stat
70 smb_idmap_getsid(uid_t id, int idtype, smb_sid_t **sid)
71 {
72 smb_idmap_batch_t sib;
73 idmap_stat stat;
74
75 stat = smb_idmap_batch_create(&sib, 1, SMB_IDMAP_ID2SID);
76 if (stat != IDMAP_SUCCESS)
77 return (stat);
78
79 stat = smb_idmap_batch_getsid(sib.sib_idmaph, &sib.sib_maps[0],
80 id, idtype);
81
82 if (stat != IDMAP_SUCCESS) {
83 smb_idmap_batch_destroy(&sib);
84 return (stat);
85 }
86
87 stat = smb_idmap_batch_getmappings(&sib);
88
89 if (stat != IDMAP_SUCCESS) {
90 smb_idmap_batch_destroy(&sib);
91 return (stat);
92 }
93
94 *sid = smb_sid_dup(sib.sib_maps[0].sim_sid);
95
96 smb_idmap_batch_destroy(&sib);
97
98 return (IDMAP_SUCCESS);
99 }
100
101 /*
102 * smb_idmap_getid
103 *
104 * Tries to get a mapping for the given SID
105 */
106 idmap_stat
107 smb_idmap_getid(smb_sid_t *sid, uid_t *id, int *id_type)
108 {
109 smb_idmap_batch_t sib;
110 smb_idmap_t *sim;
111 idmap_stat stat;
112
113 stat = smb_idmap_batch_create(&sib, 1, SMB_IDMAP_SID2ID);
114 if (stat != IDMAP_SUCCESS)
115 return (stat);
116
117 sim = &sib.sib_maps[0];
118 sim->sim_id = id;
119 stat = smb_idmap_batch_getid(sib.sib_idmaph, sim, sid, *id_type);
120 if (stat != IDMAP_SUCCESS) {
121 smb_idmap_batch_destroy(&sib);
122 return (stat);
123 }
124
125 stat = smb_idmap_batch_getmappings(&sib);
126
127 if (stat != IDMAP_SUCCESS) {
128 smb_idmap_batch_destroy(&sib);
129 return (stat);
130 }
131
132 *id_type = sim->sim_idtype;
133 smb_idmap_batch_destroy(&sib);
134
135 return (IDMAP_SUCCESS);
136 }
137
138 /*
139 * smb_idmap_batch_create
140 *
141 * Creates and initializes the context for batch ID mapping.
142 */
143 idmap_stat
144 smb_idmap_batch_create(smb_idmap_batch_t *sib, uint16_t nmap, int flags)
145 {
146 idmap_stat stat;
147
148 if (!sib)
149 return (IDMAP_ERR_ARG);
150
151 bzero(sib, sizeof (smb_idmap_batch_t));
152 stat = idmap_get_create(&sib->sib_idmaph);
153
154 if (stat != IDMAP_SUCCESS) {
155 smb_idmap_check("idmap_get_create", stat);
156 return (stat);
157 }
158
159 sib->sib_flags = flags;
160 sib->sib_nmap = nmap;
161 sib->sib_size = nmap * sizeof (smb_idmap_t);
162 sib->sib_maps = malloc(sib->sib_size);
163 if (!sib->sib_maps)
164 return (IDMAP_ERR_MEMORY);
165
166 bzero(sib->sib_maps, sib->sib_size);
167 return (IDMAP_SUCCESS);
168 }
169
170 /*
171 * smb_idmap_batch_destroy
172 *
173 * Frees the batch ID mapping context.
174 */
175 void
176 smb_idmap_batch_destroy(smb_idmap_batch_t *sib)
177 {
178 int i;
179
180 if (sib == NULL)
181 return;
182
183 if (sib->sib_idmaph) {
184 idmap_get_destroy(sib->sib_idmaph);
185 sib->sib_idmaph = NULL;
186 }
187
188 if (sib->sib_maps == NULL)
189 return;
190
191 if (sib->sib_flags & SMB_IDMAP_ID2SID) {
192 /*
193 * SIDs are allocated only when mapping
194 * UID/GID to SIDs
195 */
196 for (i = 0; i < sib->sib_nmap; i++) {
197 smb_sid_free(sib->sib_maps[i].sim_sid);
198 free(sib->sib_maps[i].sim_domsid);
199 }
200 } else if (sib->sib_flags & SMB_IDMAP_SID2ID) {
201 /*
202 * SID prefixes are allocated only when mapping
203 * SIDs to UID/GID
204 */
205 for (i = 0; i < sib->sib_nmap; i++) {
206 free(sib->sib_maps[i].sim_domsid);
207 }
208 }
209
210 if (sib->sib_size && sib->sib_maps) {
211 free(sib->sib_maps);
212 sib->sib_maps = NULL;
213 }
214 }
215
216 /*
217 * smb_idmap_batch_getid
218 *
219 * Queue a request to map the given SID to a UID or GID.
220 *
221 * sim->sim_id should point to variable that's supposed to
222 * hold the returned UID/GID. This needs to be setup by caller
223 * of this function.
224 * If requested ID type is known, it's passed as 'idtype',
225 * if it's unknown it'll be returned in sim->sim_idtype.
226 */
227 idmap_stat
228 smb_idmap_batch_getid(idmap_get_handle_t *idmaph, smb_idmap_t *sim,
229 smb_sid_t *sid, int idtype)
230 {
231 char sidstr[SMB_SID_STRSZ];
232 idmap_stat stat;
233 int flag = 0;
234
235 if (idmaph == NULL || sim == NULL || sid == NULL)
236 return (IDMAP_ERR_ARG);
237
238 smb_sid_tostr(sid, sidstr);
239 if (smb_sid_splitstr(sidstr, &sim->sim_rid) != 0)
240 return (IDMAP_ERR_SID);
241 /* Note: Free sim_domsid in smb_idmap_batch_destroy */
242 sim->sim_domsid = strdup(sidstr);
243 sim->sim_idtype = idtype;
244
245 switch (idtype) {
246 case SMB_IDMAP_USER:
247 stat = idmap_get_uidbysid(idmaph, sim->sim_domsid,
248 sim->sim_rid, flag, sim->sim_id, &sim->sim_stat);
249 smb_idmap_check("idmap_get_uidbysid", stat);
250 break;
251
252 case SMB_IDMAP_GROUP:
253 stat = idmap_get_gidbysid(idmaph, sim->sim_domsid,
254 sim->sim_rid, flag, sim->sim_id, &sim->sim_stat);
255 smb_idmap_check("idmap_get_gidbysid", stat);
256 break;
257
258 case SMB_IDMAP_UNKNOWN:
259 stat = idmap_get_pidbysid(idmaph, sim->sim_domsid,
260 sim->sim_rid, flag, sim->sim_id, &sim->sim_idtype,
261 &sim->sim_stat);
262 smb_idmap_check("idmap_get_pidbysid", stat);
263 break;
264
265 default:
266 stat = IDMAP_ERR_ARG;
267 break;
268 }
269
270 return (stat);
271 }
272
273 /*
274 * smb_idmap_batch_getsid
275 *
276 * Queue a request to map the given UID/GID to a SID.
277 *
278 * sim->sim_domsid and sim->sim_rid will contain the mapping
279 * result upon successful process of the batched request.
280 * Stash the type for error reporting (caller saves the ID).
281 *
282 * NB: sim_domsid allocated by strdup, here or in libidmap
283 */
284 idmap_stat
285 smb_idmap_batch_getsid(idmap_get_handle_t *idmaph, smb_idmap_t *sim,
286 uid_t id, int idtype)
287 {
288 idmap_stat stat;
289 int flag = 0;
290
291 if (!idmaph || !sim)
292 return (IDMAP_ERR_ARG);
293
294 sim->sim_idtype = idtype;
295 switch (idtype) {
296 case SMB_IDMAP_USER:
297 stat = idmap_get_sidbyuid(idmaph, id, flag,
298 &sim->sim_domsid, &sim->sim_rid, &sim->sim_stat);
299 smb_idmap_check("idmap_get_sidbyuid", stat);
300 break;
301
302 case SMB_IDMAP_GROUP:
303 stat = idmap_get_sidbygid(idmaph, id, flag,
304 &sim->sim_domsid, &sim->sim_rid, &sim->sim_stat);
305 smb_idmap_check("idmap_get_sidbygid", stat);
306 break;
307
308 case SMB_IDMAP_OWNERAT:
309 /* Current Owner S-1-5-32-766 */
310 sim->sim_domsid = strdup(NT_BUILTIN_DOMAIN_SIDSTR);
311 sim->sim_rid = SECURITY_CURRENT_OWNER_RID;
312 sim->sim_stat = IDMAP_SUCCESS;
313 stat = IDMAP_SUCCESS;
314 break;
315
316 case SMB_IDMAP_GROUPAT:
317 /* Current Group S-1-5-32-767 */
318 sim->sim_domsid = strdup(NT_BUILTIN_DOMAIN_SIDSTR);
319 sim->sim_rid = SECURITY_CURRENT_GROUP_RID;
320 sim->sim_stat = IDMAP_SUCCESS;
321 stat = IDMAP_SUCCESS;
322 break;
323
324 case SMB_IDMAP_EVERYONE:
325 /* Everyone S-1-1-0 */
326 sim->sim_domsid = strdup(NT_WORLD_AUTH_SIDSTR);
327 sim->sim_rid = 0;
328 sim->sim_stat = IDMAP_SUCCESS;
329 stat = IDMAP_SUCCESS;
330 break;
331
332 default:
333 return (IDMAP_ERR_ARG);
334 }
335
336 return (stat);
337 }
338
339 static void
340 smb_idmap_bgm_report(smb_idmap_batch_t *sib, smb_idmap_t *sim)
341 {
342
343 if ((sib->sib_flags & SMB_IDMAP_ID2SID) != 0) {
344 /*
345 * Note: The ID and type we asked idmap to map
346 * were saved in *sim_id and sim_idtype.
347 */
348 uint_t id = (sim->sim_id == NULL) ?
349 0 : (uint_t)*sim->sim_id;
350 syslog(LOG_ERR, "Can't get SID for "
351 "ID=%u type=%d, status=%d",
352 id, sim->sim_idtype, sim->sim_stat);
353 }
354
355 if ((sib->sib_flags & SMB_IDMAP_SID2ID) != 0) {
356 syslog(LOG_ERR, "Can't get ID for SID %s-%u, status=%d",
357 sim->sim_domsid, sim->sim_rid, sim->sim_stat);
358 }
359 }
360
361 /*
362 * smb_idmap_batch_getmappings
363 *
364 * trigger ID mapping service to get the mappings for queued
365 * requests.
366 *
367 * Checks the result of all the queued requests.
368 */
369 idmap_stat
370 smb_idmap_batch_getmappings(smb_idmap_batch_t *sib)
371 {
372 idmap_stat stat = IDMAP_SUCCESS;
373 smb_idmap_t *sim;
374 int i;
375
376 if ((stat = idmap_get_mappings(sib->sib_idmaph)) != IDMAP_SUCCESS) {
377 smb_idmap_check("idmap_get_mappings", stat);
378 return (stat);
379 }
380
381 /*
382 * Check the status for all the queued requests
383 */
384 for (i = 0, sim = sib->sib_maps; i < sib->sib_nmap; i++, sim++) {
385 if (sim->sim_stat != IDMAP_SUCCESS) {
386 smb_idmap_bgm_report(sib, sim);
387 if ((sib->sib_flags & SMB_IDMAP_SKIP_ERRS) == 0) {
388 return (sim->sim_stat);
389 }
390 }
391 }
392
393 if (smb_idmap_batch_binsid(sib) != 0)
394 stat = IDMAP_ERR_OTHER;
395
396 return (stat);
397 }
398
399 /*
400 * smb_idmap_batch_binsid
401 *
402 * Convert sidrids to binary sids
403 *
404 * Returns 0 if successful and non-zero upon failure.
405 */
406 static int
407 smb_idmap_batch_binsid(smb_idmap_batch_t *sib)
408 {
409 smb_sid_t *sid;
410 smb_idmap_t *sim;
411 int i;
412
413 if (sib->sib_flags & SMB_IDMAP_SID2ID)
414 /* This operation is not required */
415 return (0);
416
417 sim = sib->sib_maps;
418 for (i = 0; i < sib->sib_nmap; sim++, i++) {
419 if (sim->sim_domsid == NULL)
420 return (-1);
421
422 sid = smb_sid_fromstr(sim->sim_domsid);
423 if (sid == NULL)
424 return (-1);
425
426 sim->sim_sid = smb_sid_splice(sid, sim->sim_rid);
427 smb_sid_free(sid);
428 }
429
430 return (0);
431 }