source: vendor/current/source3/utils/sharesec.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 11.9 KB
Line 
1/*
2 * Unix SMB/Netbios implementation.
3 * Utility for managing share permissions
4 *
5 * Copyright (C) Tim Potter 2000
6 * Copyright (C) Jeremy Allison 2000
7 * Copyright (C) Jelmer Vernooij 2003
8 * Copyright (C) Gerald (Jerry) Carter 2005.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 */
23
24struct cli_state;
25
26#include "includes.h"
27#include "popt_common.h"
28#include "../libcli/security/security.h"
29#include "passdb/machine_sid.h"
30#include "util_sd.h"
31
32static TALLOC_CTX *ctx;
33
34enum acl_mode { SMB_ACL_DELETE,
35 SMB_ACL_MODIFY,
36 SMB_ACL_ADD,
37 SMB_ACL_SET,
38 SMB_SD_DELETE,
39 SMB_SD_SETSDDL,
40 SMB_SD_VIEWSDDL,
41 SMB_ACL_VIEW,
42 SMB_ACL_VIEW_ALL };
43
44/********************************************************************
45********************************************************************/
46
47static struct security_descriptor* parse_acl_string(TALLOC_CTX *mem_ctx, const char *szACL, size_t *sd_size )
48{
49 struct security_descriptor *sd = NULL;
50 struct security_ace *ace;
51 struct security_acl *theacl;
52 int num_ace;
53 const char *pacl;
54 int i;
55
56 if ( !szACL )
57 return NULL;
58
59 pacl = szACL;
60 num_ace = count_chars( pacl, ',' ) + 1;
61
62 if ( !(ace = talloc_zero_array( mem_ctx, struct security_ace, num_ace )) )
63 return NULL;
64
65 for ( i=0; i<num_ace; i++ ) {
66 char *end_acl = strchr_m( pacl, ',' );
67 fstring acl_string;
68
69 strncpy( acl_string, pacl, MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1) );
70 acl_string[MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1)] = '\0';
71
72 if ( !parse_ace(NULL, &ace[i], acl_string ) )
73 return NULL;
74
75 pacl = end_acl;
76 pacl++;
77 }
78
79 if ( !(theacl = make_sec_acl( mem_ctx, NT4_ACL_REVISION, num_ace, ace )) )
80 return NULL;
81
82 sd = make_sec_desc( mem_ctx, SD_REVISION, SEC_DESC_SELF_RELATIVE,
83 NULL, NULL, NULL, theacl, sd_size);
84
85 return sd;
86}
87
88/* add an ACE to a list of ACEs in a struct security_acl */
89static bool add_ace(TALLOC_CTX *mem_ctx, struct security_acl **the_acl, struct security_ace *ace)
90{
91 struct security_acl *new_ace;
92 struct security_ace *aces;
93 if (! *the_acl) {
94 return (((*the_acl) = make_sec_acl(mem_ctx, 3, 1, ace)) != NULL);
95 }
96
97 if (!(aces = SMB_CALLOC_ARRAY(struct security_ace, 1+(*the_acl)->num_aces))) {
98 return False;
99 }
100 memcpy(aces, (*the_acl)->aces, (*the_acl)->num_aces * sizeof(struct
101 security_ace));
102 memcpy(aces+(*the_acl)->num_aces, ace, sizeof(struct security_ace));
103 new_ace = make_sec_acl(mem_ctx,(*the_acl)->revision,1+(*the_acl)->num_aces, aces);
104 SAFE_FREE(aces);
105 (*the_acl) = new_ace;
106 return True;
107}
108
109/* The MSDN is contradictory over the ordering of ACE entries in an ACL.
110 However NT4 gives a "The information may have been modified by a
111 computer running Windows NT 5.0" if denied ACEs do not appear before
112 allowed ACEs. */
113
114static int ace_compare(struct security_ace *ace1, struct security_ace *ace2)
115{
116 if (security_ace_equal(ace1, ace2))
117 return 0;
118
119 if (ace1->type != ace2->type)
120 return ace2->type - ace1->type;
121
122 if (dom_sid_compare(&ace1->trustee, &ace2->trustee))
123 return dom_sid_compare(&ace1->trustee, &ace2->trustee);
124
125 if (ace1->flags != ace2->flags)
126 return ace1->flags - ace2->flags;
127
128 if (ace1->access_mask != ace2->access_mask)
129 return ace1->access_mask - ace2->access_mask;
130
131 if (ace1->size != ace2->size)
132 return ace1->size - ace2->size;
133
134 return memcmp(ace1, ace2, sizeof(struct security_ace));
135}
136
137static void sort_acl(struct security_acl *the_acl)
138{
139 uint32_t i;
140 if (!the_acl) return;
141
142 TYPESAFE_QSORT(the_acl->aces, the_acl->num_aces, ace_compare);
143
144 for (i=1;i<the_acl->num_aces;) {
145 if (security_ace_equal(&the_acl->aces[i-1],
146 &the_acl->aces[i])) {
147 int j;
148 for (j=i; j<the_acl->num_aces-1; j++) {
149 the_acl->aces[j] = the_acl->aces[j+1];
150 }
151 the_acl->num_aces--;
152 } else {
153 i++;
154 }
155 }
156}
157
158
159static int change_share_sec(TALLOC_CTX *mem_ctx, const char *sharename, char *the_acl, enum acl_mode mode)
160{
161 struct security_descriptor *sd = NULL;
162 struct security_descriptor *old = NULL;
163 size_t sd_size = 0;
164 uint32_t i, j;
165
166 if (mode != SMB_ACL_SET && mode != SMB_SD_DELETE) {
167 if (!(old = get_share_security( mem_ctx, sharename, &sd_size )) ) {
168 fprintf(stderr, "Unable to retrieve permissions for share "
169 "[%s]\n", sharename);
170 return -1;
171 }
172 }
173
174 if ( (mode != SMB_ACL_VIEW && mode != SMB_SD_DELETE) &&
175 !(sd = parse_acl_string(mem_ctx, the_acl, &sd_size )) ) {
176 fprintf( stderr, "Failed to parse acl\n");
177 return -1;
178 }
179
180 switch (mode) {
181 case SMB_ACL_VIEW_ALL:
182 /* should not happen */
183 return 0;
184 case SMB_ACL_VIEW:
185 sec_desc_print(NULL, stdout, old, false);
186 return 0;
187 case SMB_ACL_DELETE:
188 for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
189 bool found = False;
190
191 for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
192 if (security_ace_equal(&sd->dacl->aces[i],
193 &old->dacl->aces[j])) {
194 uint32_t k;
195 for (k=j; k<old->dacl->num_aces-1;k++) {
196 old->dacl->aces[k] = old->dacl->aces[k+1];
197 }
198 old->dacl->num_aces--;
199 found = True;
200 break;
201 }
202 }
203
204 if (!found) {
205 printf("ACL for ACE:");
206 print_ace(NULL, stdout, &sd->dacl->aces[i], false);
207 printf(" not found\n");
208 }
209 }
210 break;
211 case SMB_ACL_MODIFY:
212 for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
213 bool found = False;
214
215 for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
216 if (dom_sid_equal(&sd->dacl->aces[i].trustee,
217 &old->dacl->aces[j].trustee)) {
218 old->dacl->aces[j] = sd->dacl->aces[i];
219 found = True;
220 }
221 }
222
223 if (!found) {
224 printf("ACL for SID %s not found\n",
225 sid_string_tos(&sd->dacl->aces[i].trustee));
226 }
227 }
228
229 if (sd->owner_sid) {
230 old->owner_sid = sd->owner_sid;
231 }
232
233 if (sd->group_sid) {
234 old->group_sid = sd->group_sid;
235 }
236 break;
237 case SMB_ACL_ADD:
238 for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
239 add_ace(mem_ctx, &old->dacl, &sd->dacl->aces[i]);
240 }
241 break;
242 case SMB_ACL_SET:
243 old = sd;
244 break;
245 case SMB_SD_DELETE:
246 if (!delete_share_security(sharename)) {
247 fprintf( stderr, "Failed to delete security descriptor for "
248 "share [%s]\n", sharename );
249 return -1;
250 }
251 return 0;
252 default:
253 fprintf(stderr, "invalid command\n");
254 return -1;
255 }
256
257 /* Denied ACE entries must come before allowed ones */
258 sort_acl(old->dacl);
259
260 if ( !set_share_security( sharename, old ) ) {
261 fprintf( stderr, "Failed to store acl for share [%s]\n", sharename );
262 return 2;
263 }
264 return 0;
265}
266
267static int set_sharesec_sddl(const char *sharename, const char *sddl)
268{
269 struct security_descriptor *sd;
270 bool ret;
271
272 sd = sddl_decode(talloc_tos(), sddl, get_global_sam_sid());
273 if (sd == NULL) {
274 fprintf(stderr, "Failed to parse acl\n");
275 return -1;
276 }
277
278 ret = set_share_security(sharename, sd);
279 TALLOC_FREE(sd);
280 if (!ret) {
281 fprintf(stderr, "Failed to store acl for share [%s]\n",
282 sharename);
283 return -1;
284 }
285
286 return 0;
287}
288
289static int view_sharesec_sddl(const char *sharename)
290{
291 struct security_descriptor *sd;
292 size_t sd_size;
293 char *acl;
294
295 sd = get_share_security(talloc_tos(), sharename, &sd_size);
296 if (sd == NULL) {
297 fprintf(stderr, "Unable to retrieve permissions for share "
298 "[%s]\n", sharename);
299 return -1;
300 }
301
302 acl = sddl_encode(talloc_tos(), sd, get_global_sam_sid());
303 TALLOC_FREE(sd);
304 if (acl == NULL) {
305 fprintf(stderr, "Unable to sddl-encode permissions for share "
306 "[%s]\n", sharename);
307 return -1;
308 }
309 printf("%s\n", acl);
310 TALLOC_FREE(acl);
311 return 0;
312}
313
314/********************************************************************
315 main program
316********************************************************************/
317
318enum {
319 OPT_VIEW_ALL = 1000,
320};
321
322int main(int argc, const char *argv[])
323{
324 int opt;
325 int retval = 0;
326 enum acl_mode mode = SMB_ACL_SET;
327 static char *the_acl = NULL;
328 fstring sharename;
329 bool force_acl = False;
330 int snum;
331 poptContext pc;
332 bool initialize_sid = False;
333 struct poptOption long_options[] = {
334 POPT_AUTOHELP
335 { "remove", 'r', POPT_ARG_STRING, &the_acl, 'r', "Remove ACEs", "ACL" },
336 { "modify", 'm', POPT_ARG_STRING, &the_acl, 'm', "Modify existing ACEs", "ACL" },
337 { "add", 'a', POPT_ARG_STRING, &the_acl, 'a', "Add ACEs", "ACL" },
338 { "replace", 'R', POPT_ARG_STRING, &the_acl, 'R', "Overwrite share permission ACL", "ACLS" },
339 { "delete", 'D', POPT_ARG_NONE, NULL, 'D', "Delete the entire security descriptor" },
340 { "setsddl", 'S', POPT_ARG_STRING, the_acl, 'S',
341 "Set the SD in sddl format" },
342 { "viewsddl", 'V', POPT_ARG_NONE, the_acl, 'V',
343 "View the SD in sddl format" },
344 { "view", 'v', POPT_ARG_NONE, NULL, 'v', "View current share permissions" },
345 { "view-all", 0, POPT_ARG_NONE, NULL, OPT_VIEW_ALL,
346 "View all current share permissions" },
347 { "machine-sid", 'M', POPT_ARG_NONE, NULL, 'M', "Initialize the machine SID" },
348 { "force", 'F', POPT_ARG_NONE, NULL, 'F', "Force storing the ACL", "ACLS" },
349 POPT_COMMON_SAMBA
350 { NULL }
351 };
352
353 if ( !(ctx = talloc_stackframe()) ) {
354 fprintf( stderr, "Failed to initialize talloc context!\n");
355 return -1;
356 }
357
358 /* set default debug level to 1 regardless of what smb.conf sets */
359 setup_logging( "sharesec", DEBUG_STDERR);
360
361 smb_init_locale();
362
363 lp_set_cmdline("log level", "1");
364
365 pc = poptGetContext("sharesec", argc, argv, long_options, 0);
366
367 poptSetOtherOptionHelp(pc, "sharename\n");
368
369 while ((opt = poptGetNextOpt(pc)) != -1) {
370 switch (opt) {
371 case 'r':
372 the_acl = smb_xstrdup(poptGetOptArg(pc));
373 mode = SMB_ACL_DELETE;
374 break;
375
376 case 'm':
377 the_acl = smb_xstrdup(poptGetOptArg(pc));
378 mode = SMB_ACL_MODIFY;
379 break;
380
381 case 'a':
382 the_acl = smb_xstrdup(poptGetOptArg(pc));
383 mode = SMB_ACL_ADD;
384 break;
385
386 case 'R':
387 the_acl = smb_xstrdup(poptGetOptArg(pc));
388 mode = SMB_ACL_SET;
389 break;
390
391 case 'D':
392 mode = SMB_SD_DELETE;
393 break;
394
395 case 'S':
396 mode = SMB_SD_SETSDDL;
397 the_acl = smb_xstrdup(poptGetOptArg(pc));
398 break;
399
400 case 'V':
401 mode = SMB_SD_VIEWSDDL;
402 break;
403
404 case 'v':
405 mode = SMB_ACL_VIEW;
406 break;
407
408 case 'F':
409 force_acl = True;
410 break;
411
412 case 'M':
413 initialize_sid = True;
414 break;
415 case OPT_VIEW_ALL:
416 mode = SMB_ACL_VIEW_ALL;
417 break;
418 }
419 }
420
421 setlinebuf(stdout);
422
423 lp_load_with_registry_shares(get_dyn_CONFIGFILE());
424
425 /* check for initializing secrets.tdb first */
426
427 if ( initialize_sid ) {
428 struct dom_sid *sid = get_global_sam_sid();
429
430 if ( !sid ) {
431 fprintf( stderr, "Failed to retrieve Machine SID!\n");
432 return 3;
433 }
434
435 printf ("%s\n", sid_string_tos( sid ) );
436 return 0;
437 }
438
439 if ( mode == SMB_ACL_VIEW && force_acl ) {
440 fprintf( stderr, "Invalid combination of -F and -v\n");
441 return -1;
442 }
443
444 if (mode == SMB_ACL_VIEW_ALL) {
445 int i;
446
447 for (i=0; i<lp_numservices(); i++) {
448 TALLOC_CTX *frame = talloc_stackframe();
449 const char *service = lp_servicename(frame, i);
450
451 if (service == NULL) {
452 continue;
453 }
454
455 printf("[%s]\n", service);
456 change_share_sec(frame, service, NULL, SMB_ACL_VIEW);
457 printf("\n");
458 TALLOC_FREE(frame);
459 }
460 goto done;
461 }
462
463 /* get the sharename */
464
465 if(!poptPeekArg(pc)) {
466 poptPrintUsage(pc, stderr, 0);
467 return -1;
468 }
469
470 fstrcpy(sharename, poptGetArg(pc));
471
472 snum = lp_servicenumber( sharename );
473
474 if ( snum == -1 && !force_acl ) {
475 fprintf( stderr, "Invalid sharename: %s\n", sharename);
476 return -1;
477 }
478
479 switch (mode) {
480 case SMB_SD_SETSDDL:
481 retval = set_sharesec_sddl(sharename, the_acl);
482 break;
483 case SMB_SD_VIEWSDDL:
484 retval = view_sharesec_sddl(sharename);
485 break;
486 default:
487 retval = change_share_sec(ctx, sharename, the_acl, mode);
488 break;
489 }
490
491done:
492 talloc_destroy(ctx);
493
494 return retval;
495}
Note: See TracBrowser for help on using the repository browser.