source: trunk/server/libcli/security/dom_sid.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 9.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Samba utility functions
4
5 Copyright (C) Stefan (metze) Metzmacher 2002-2004
6 Copyright (C) Andrew Tridgell 1992-2004
7 Copyright (C) Jeremy Allison 1999
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23#include "includes.h"
24#include "librpc/gen_ndr/security.h"
25#include "dom_sid.h"
26
27/*****************************************************************
28 Compare the auth portion of two sids.
29*****************************************************************/
30
31int dom_sid_compare_auth(const struct dom_sid *sid1,
32 const struct dom_sid *sid2)
33{
34 int i;
35
36 if (sid1 == sid2)
37 return 0;
38 if (!sid1)
39 return -1;
40 if (!sid2)
41 return 1;
42
43 if (sid1->sid_rev_num != sid2->sid_rev_num)
44 return sid1->sid_rev_num - sid2->sid_rev_num;
45
46 for (i = 0; i < 6; i++)
47 if (sid1->id_auth[i] != sid2->id_auth[i])
48 return sid1->id_auth[i] - sid2->id_auth[i];
49
50 return 0;
51}
52
53/*****************************************************************
54 Compare two sids.
55*****************************************************************/
56
57int dom_sid_compare(const struct dom_sid *sid1, const struct dom_sid *sid2)
58{
59 int i;
60
61 if (sid1 == sid2)
62 return 0;
63 if (!sid1)
64 return -1;
65 if (!sid2)
66 return 1;
67
68 /* Compare most likely different rids, first: i.e start at end */
69 if (sid1->num_auths != sid2->num_auths)
70 return sid1->num_auths - sid2->num_auths;
71
72 for (i = sid1->num_auths-1; i >= 0; --i)
73 if (sid1->sub_auths[i] != sid2->sub_auths[i])
74 return sid1->sub_auths[i] - sid2->sub_auths[i];
75
76 return dom_sid_compare_auth(sid1, sid2);
77}
78
79/*****************************************************************
80 Compare two sids.
81*****************************************************************/
82
83bool dom_sid_equal(const struct dom_sid *sid1, const struct dom_sid *sid2)
84{
85 return dom_sid_compare(sid1, sid2) == 0;
86}
87
88/*****************************************************************
89 Add a rid to the end of a sid
90*****************************************************************/
91
92bool sid_append_rid(struct dom_sid *sid, uint32_t rid)
93{
94 if (sid->num_auths < ARRAY_SIZE(sid->sub_auths)) {
95 sid->sub_auths[sid->num_auths++] = rid;
96 return true;
97 }
98 return false;
99}
100
101/*
102 See if 2 SIDs are in the same domain
103 this just compares the leading sub-auths
104*/
105int dom_sid_compare_domain(const struct dom_sid *sid1,
106 const struct dom_sid *sid2)
107{
108 int n, i;
109
110 n = MIN(sid1->num_auths, sid2->num_auths);
111
112 for (i = n-1; i >= 0; --i)
113 if (sid1->sub_auths[i] != sid2->sub_auths[i])
114 return sid1->sub_auths[i] - sid2->sub_auths[i];
115
116 return dom_sid_compare_auth(sid1, sid2);
117}
118
119/*****************************************************************
120 Convert a string to a SID. Returns True on success, False on fail.
121 Return the first character not parsed in endp.
122*****************************************************************/
123
124bool dom_sid_parse_endp(const char *sidstr,struct dom_sid *sidout,
125 const char **endp)
126{
127 const char *p;
128 char *q;
129 /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
130 uint32_t conv;
131
132 ZERO_STRUCTP(sidout);
133
134 if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
135 goto format_error;
136 }
137
138 /* Get the revision number. */
139 p = sidstr + 2;
140
141 if (!isdigit(*p)) {
142 goto format_error;
143 }
144
145 conv = (uint32_t) strtoul(p, &q, 10);
146 if (!q || (*q != '-')) {
147 goto format_error;
148 }
149 sidout->sid_rev_num = (uint8_t) conv;
150 q++;
151
152 if (!isdigit(*q)) {
153 goto format_error;
154 }
155
156 /* get identauth */
157 conv = (uint32_t) strtoul(q, &q, 10);
158 if (!q) {
159 goto format_error;
160 }
161
162 /* identauth in decimal should be < 2^32 */
163 /* NOTE - the conv value is in big-endian format. */
164 sidout->id_auth[0] = 0;
165 sidout->id_auth[1] = 0;
166 sidout->id_auth[2] = (conv & 0xff000000) >> 24;
167 sidout->id_auth[3] = (conv & 0x00ff0000) >> 16;
168 sidout->id_auth[4] = (conv & 0x0000ff00) >> 8;
169 sidout->id_auth[5] = (conv & 0x000000ff);
170
171 sidout->num_auths = 0;
172 if (*q != '-') {
173 /* Just id_auth, no subauths */
174 return true;
175 }
176
177 q++;
178
179 while (true) {
180 char *end;
181
182 if (!isdigit(*q)) {
183 goto format_error;
184 }
185
186 conv = strtoul(q, &end, 10);
187 if (end == q) {
188 goto format_error;
189 }
190
191 if (!sid_append_rid(sidout, conv)) {
192 DEBUG(3, ("Too many sid auths in %s\n", sidstr));
193 return false;
194 }
195
196 q = end;
197 if (*q != '-') {
198 break;
199 }
200 q += 1;
201 }
202 if (endp != NULL) {
203 *endp = q;
204 }
205 return true;
206
207format_error:
208 DEBUG(3, ("string_to_sid: SID %s is not in a valid format\n", sidstr));
209 return false;
210}
211
212bool string_to_sid(struct dom_sid *sidout, const char *sidstr)
213{
214 return dom_sid_parse(sidstr, sidout);
215}
216
217bool dom_sid_parse(const char *sidstr, struct dom_sid *ret)
218{
219 return dom_sid_parse_endp(sidstr, ret, NULL);
220}
221
222/*
223 convert a string to a dom_sid, returning a talloc'd dom_sid
224*/
225struct dom_sid *dom_sid_parse_talloc(TALLOC_CTX *mem_ctx, const char *sidstr)
226{
227 struct dom_sid *ret;
228 ret = talloc(mem_ctx, struct dom_sid);
229 if (!ret) {
230 return NULL;
231 }
232 if (!dom_sid_parse(sidstr, ret)) {
233 talloc_free(ret);
234 return NULL;
235 }
236
237 return ret;
238}
239
240/*
241 convert a string to a dom_sid, returning a talloc'd dom_sid
242*/
243struct dom_sid *dom_sid_parse_length(TALLOC_CTX *mem_ctx, const DATA_BLOB *sid)
244{
245 struct dom_sid *ret;
246 char *p = talloc_strndup(mem_ctx, (char *)sid->data, sid->length);
247 if (!p) {
248 return NULL;
249 }
250 ret = dom_sid_parse_talloc(mem_ctx, p);
251 talloc_free(p);
252 return ret;
253}
254
255/*
256 copy a dom_sid structure
257*/
258struct dom_sid *dom_sid_dup(TALLOC_CTX *mem_ctx, const struct dom_sid *dom_sid)
259{
260 struct dom_sid *ret;
261 int i;
262
263 if (!dom_sid) {
264 return NULL;
265 }
266
267 ret = talloc(mem_ctx, struct dom_sid);
268 if (!ret) {
269 return NULL;
270 }
271
272 ret->sid_rev_num = dom_sid->sid_rev_num;
273 ret->id_auth[0] = dom_sid->id_auth[0];
274 ret->id_auth[1] = dom_sid->id_auth[1];
275 ret->id_auth[2] = dom_sid->id_auth[2];
276 ret->id_auth[3] = dom_sid->id_auth[3];
277 ret->id_auth[4] = dom_sid->id_auth[4];
278 ret->id_auth[5] = dom_sid->id_auth[5];
279 ret->num_auths = dom_sid->num_auths;
280
281 for (i=0;i<dom_sid->num_auths;i++) {
282 ret->sub_auths[i] = dom_sid->sub_auths[i];
283 }
284
285 return ret;
286}
287
288/*
289 add a rid to a domain dom_sid to make a full dom_sid. This function
290 returns a new sid in the supplied memory context
291*/
292struct dom_sid *dom_sid_add_rid(TALLOC_CTX *mem_ctx,
293 const struct dom_sid *domain_sid,
294 uint32_t rid)
295{
296 struct dom_sid *sid;
297
298 sid = dom_sid_dup(mem_ctx, domain_sid);
299 if (!sid) return NULL;
300
301 if (!sid_append_rid(sid, rid)) {
302 talloc_free(sid);
303 return NULL;
304 }
305
306 return sid;
307}
308
309/*
310 Split up a SID into its domain and RID part
311*/
312NTSTATUS dom_sid_split_rid(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
313 struct dom_sid **domain, uint32_t *rid)
314{
315 if (sid->num_auths == 0) {
316 return NT_STATUS_INVALID_PARAMETER;
317 }
318
319 if (domain) {
320 if (!(*domain = dom_sid_dup(mem_ctx, sid))) {
321 return NT_STATUS_NO_MEMORY;
322 }
323
324 (*domain)->num_auths -= 1;
325 }
326
327 if (rid) {
328 *rid = sid->sub_auths[sid->num_auths - 1];
329 }
330
331 return NT_STATUS_OK;
332}
333
334/*
335 return true if the 2nd sid is in the domain given by the first sid
336*/
337bool dom_sid_in_domain(const struct dom_sid *domain_sid,
338 const struct dom_sid *sid)
339{
340 int i;
341
342 if (!domain_sid || !sid) {
343 return false;
344 }
345
346 if (domain_sid->num_auths > sid->num_auths) {
347 return false;
348 }
349
350 for (i = domain_sid->num_auths-1; i >= 0; --i) {
351 if (domain_sid->sub_auths[i] != sid->sub_auths[i]) {
352 return false;
353 }
354 }
355
356 return dom_sid_compare_auth(domain_sid, sid) == 0;
357}
358
359/*
360 Convert a dom_sid to a string, printing into a buffer. Return the
361 string length. If it overflows, return the string length that would
362 result (buflen needs to be +1 for the terminating 0).
363*/
364int dom_sid_string_buf(const struct dom_sid *sid, char *buf, int buflen)
365{
366 int i, ofs;
367 uint32_t ia;
368
369 if (!sid) {
370 strlcpy(buf, "(NULL SID)", buflen);
371 return 10; /* strlen("(NULL SID)") */
372 }
373
374 ia = (sid->id_auth[5]) +
375 (sid->id_auth[4] << 8 ) +
376 (sid->id_auth[3] << 16) +
377 (sid->id_auth[2] << 24);
378
379 ofs = snprintf(buf, buflen, "S-%u-%lu",
380 (unsigned int)sid->sid_rev_num, (unsigned long)ia);
381
382 for (i = 0; i < sid->num_auths; i++) {
383 ofs += snprintf(buf + ofs, MAX(buflen - ofs, 0), "-%lu",
384 (unsigned long)sid->sub_auths[i]);
385 }
386 return ofs;
387}
388
389/*
390 convert a dom_sid to a string
391*/
392char *dom_sid_string(TALLOC_CTX *mem_ctx, const struct dom_sid *sid)
393{
394 char buf[DOM_SID_STR_BUFLEN];
395 char *result;
396 int len;
397
398 len = dom_sid_string_buf(sid, buf, sizeof(buf));
399
400 if (len+1 > sizeof(buf)) {
401 return talloc_strdup(mem_ctx, "(SID ERR)");
402 }
403
404 /*
405 * Avoid calling strlen (via talloc_strdup), we already have
406 * the length
407 */
408 result = (char *)talloc_memdup(mem_ctx, buf, len+1);
409
410 /*
411 * beautify the talloc_report output
412 */
413 talloc_set_name_const(result, result);
414 return result;
415}
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