Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 :
4 : fast routines for getting the wire size of security objects
5 :
6 : Copyright (C) Andrew Tridgell 2003
7 : Copyright (C) Stefan Metzmacher 2006-2008
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 :
24 : #include "includes.h"
25 : #include "librpc/gen_ndr/ndr_security.h"
26 : #include "../libcli/security/security.h"
27 :
28 :
29 : /*
30 : * Find the wire size of a security_ace that has no trailing coda.
31 : * This is used in ndr_pull_security_ace() generated from security.idl
32 : * to work out where the coda starts (and in ndr_size_security_ace()
33 : * just below).
34 : */
35 592985699 : static size_t ndr_size_security_ace_core(const struct security_ace *ace, libndr_flags flags)
36 : {
37 22212597 : size_t ret;
38 :
39 592985699 : if (!ace) return 0;
40 :
41 592985699 : ret = 8 + ndr_size_dom_sid(&ace->trustee, flags);
42 592985699 : if (sec_ace_object(ace->type)) {
43 373111208 : ret += 4; /* uint32 bitmap ace->object.object.flags */
44 373111208 : if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
45 342867845 : ret += 16; /* GUID ace->object.object.type.type */
46 : }
47 373111208 : if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
48 214040743 : ret += 16; /* GUID ace->object.object.inherited_type.inherited_type */
49 : }
50 : }
51 :
52 570773102 : return ret;
53 : }
54 :
55 : /*
56 : return the wire size of a security_ace
57 : */
58 159340329 : size_t ndr_size_security_ace(const struct security_ace *ace, libndr_flags flags)
59 : {
60 159340329 : size_t base = ndr_size_security_ace_core(ace, flags);
61 159340329 : size_t ret = base;
62 159340329 : if (sec_ace_callback(ace->type)) {
63 4160 : ret += ace->coda.conditions.length;
64 159336169 : } else if (ace->type == SEC_ACE_TYPE_SYSTEM_RESOURCE_ATTRIBUTE) {
65 264 : ret += ndr_size_security_ace_coda(&ace->coda, ace->type, flags);
66 : } else {
67 159335905 : ret += ace->coda.ignored.length;
68 : }
69 : /* round up to a multiple of 4 (MS-DTYP 2.4.4.1) */
70 159340329 : ret = (ret + 3ULL) & ~3ULL;
71 159340329 : if (unlikely(ret < base)) {
72 : /* overflow, and there's not much we can do anyway */
73 0 : return 0;
74 : }
75 153152826 : return ret;
76 : }
77 :
78 : /*
79 : * An ACE coda can't be bigger than the space allowed for by
80 : * ace->size, so we need to check this from the context of the ACE.
81 : *
82 : * Usually the coda also can't be any smaller than the remaining
83 : * space, because it is defined as a blob consuming everything it can.
84 : *
85 : * This is only used to find the size for the coda subcontext in
86 : * security.idl.
87 : */
88 433645370 : size_t ndr_subcontext_size_of_ace_coda(const struct security_ace *ace,
89 : size_t ace_size,
90 : libndr_flags flags)
91 : {
92 16025094 : size_t core_size;
93 433645370 : if (ace_size == 0) {
94 0 : return 0;
95 : }
96 433645370 : core_size = ndr_size_security_ace_core(ace, flags);
97 433645370 : if (ace_size < core_size) {
98 0 : return 0;
99 : }
100 433645370 : return ace_size - core_size;
101 : }
102 :
103 : /*
104 : return the wire size of a security_acl
105 : */
106 8012758 : size_t ndr_size_security_acl(const struct security_acl *theacl, libndr_flags flags)
107 : {
108 315659 : size_t ret;
109 315659 : int i;
110 8012758 : if (!theacl) return 0;
111 6323752 : ret = 8;
112 50377212 : for (i=0;i<theacl->num_aces;i++) {
113 43742634 : ret += ndr_size_security_ace(&theacl->aces[i], flags);
114 : }
115 6323752 : return ret;
116 : }
117 :
118 : /*
119 : return the wire size of a security descriptor
120 : */
121 1378463 : size_t ndr_size_security_descriptor(const struct security_descriptor *sd, libndr_flags flags)
122 : {
123 4813 : size_t ret;
124 1378463 : if (!sd) return 0;
125 :
126 1377705 : ret = 20;
127 1377705 : ret += ndr_size_dom_sid(sd->owner_sid, flags);
128 1377705 : ret += ndr_size_dom_sid(sd->group_sid, flags);
129 1377705 : ret += ndr_size_security_acl(sd->dacl, flags);
130 1377705 : ret += ndr_size_security_acl(sd->sacl, flags);
131 1377705 : return ret;
132 : }
133 :
134 : /*
135 : return the wire size of a dom_sid
136 : */
137 615953601 : size_t ndr_size_dom_sid(const struct dom_sid *sid, libndr_flags flags)
138 : {
139 615953601 : if (!sid) return 0;
140 615609838 : return 8 + 4*sid->num_auths;
141 : }
142 :
143 3138296 : size_t ndr_size_dom_sid28(const struct dom_sid *sid, libndr_flags flags)
144 : {
145 3138296 : if (all_zero((const uint8_t *)sid, sizeof(struct dom_sid))) {
146 2802676 : return 0;
147 : }
148 335614 : return ndr_size_dom_sid(sid, flags);
149 : }
150 :
151 572 : size_t ndr_size_dom_sid0(const struct dom_sid *sid, libndr_flags flags)
152 : {
153 572 : return ndr_size_dom_sid28(sid, flags);
154 : }
155 :
156 : /*
157 : print a dom_sid
158 : */
159 45642 : void ndr_print_dom_sid(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
160 : {
161 4005 : struct dom_sid_buf buf;
162 45642 : ndr->print(ndr, "%-25s: %s", name, dom_sid_str_buf(sid, &buf));
163 45642 : }
164 :
165 23612 : void ndr_print_dom_sid2(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
166 : {
167 23612 : ndr_print_dom_sid(ndr, name, sid);
168 23612 : }
169 :
170 13970 : void ndr_print_dom_sid28(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
171 : {
172 13970 : ndr_print_dom_sid(ndr, name, sid);
173 13970 : }
174 :
175 2 : void ndr_print_dom_sid0(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
176 : {
177 2 : ndr_print_dom_sid(ndr, name, sid);
178 2 : }
179 :
180 :
181 : /*
182 : parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
183 : */
184 581891 : enum ndr_err_code ndr_pull_dom_sid2(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *sid)
185 : {
186 24143 : uint32_t num_auths;
187 581891 : if (!(ndr_flags & NDR_SCALARS)) {
188 0 : return NDR_ERR_SUCCESS;
189 : }
190 581891 : NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &num_auths));
191 581891 : NDR_CHECK(ndr_pull_dom_sid(ndr, ndr_flags, sid));
192 581891 : if (sid->num_auths != num_auths) {
193 0 : return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
194 : "Bad num_auths %"PRIu32"; should equal %"PRId8,
195 : num_auths, sid->num_auths);
196 : }
197 557748 : return NDR_ERR_SUCCESS;
198 : }
199 :
200 : /*
201 : parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
202 : */
203 428983 : enum ndr_err_code ndr_push_dom_sid2(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *sid)
204 : {
205 428983 : if (!(ndr_flags & NDR_SCALARS)) {
206 0 : return NDR_ERR_SUCCESS;
207 : }
208 428983 : NDR_CHECK(ndr_push_uint3264(ndr, NDR_SCALARS, sid->num_auths));
209 428983 : return ndr_push_dom_sid(ndr, ndr_flags, sid);
210 : }
211 :
212 : /*
213 : parse a dom_sid28 - this is a dom_sid in a fixed 28 byte buffer, so we need to ensure there are only up to 5 sub_auth
214 : */
215 2753222 : enum ndr_err_code ndr_pull_dom_sid28(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *sid)
216 : {
217 24 : enum ndr_err_code status;
218 24 : struct ndr_pull *subndr;
219 :
220 2753222 : if (!(ndr_flags & NDR_SCALARS)) {
221 1376599 : return NDR_ERR_SUCCESS;
222 : }
223 :
224 1376611 : subndr = talloc_zero(ndr, struct ndr_pull);
225 1376611 : NDR_ERR_HAVE_NO_MEMORY(subndr);
226 1376611 : subndr->flags = ndr->flags;
227 1376611 : subndr->current_mem_ctx = ndr->current_mem_ctx;
228 :
229 1376611 : subndr->data = ndr->data + ndr->offset;
230 1376611 : subndr->data_size = 28;
231 1376611 : subndr->offset = 0;
232 :
233 1376611 : status = ndr_pull_advance(ndr, 28);
234 1376611 : if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
235 0 : talloc_free(subndr);
236 0 : return status;
237 : }
238 :
239 1376611 : status = ndr_pull_dom_sid(subndr, ndr_flags, sid);
240 1376611 : if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
241 : /* handle a w2k bug which send random data in the buffer */
242 1 : ZERO_STRUCTP(sid);
243 1376610 : } else if (sid->num_auths == 0) {
244 1243236 : ZERO_STRUCT(sid->sub_auths);
245 : }
246 :
247 1376611 : talloc_free(subndr);
248 1376611 : return NDR_ERR_SUCCESS;
249 : }
250 :
251 : /*
252 : push a dom_sid28 - this is a dom_sid in a 28 byte fixed buffer
253 : */
254 6275636 : enum ndr_err_code ndr_push_dom_sid28(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *sid)
255 : {
256 24 : uint32_t old_offset;
257 24 : uint32_t padding;
258 :
259 6275636 : if (!(ndr_flags & NDR_SCALARS)) {
260 3137806 : return NDR_ERR_SUCCESS;
261 : }
262 :
263 3137818 : if (sid->num_auths > 5) {
264 0 : return ndr_push_error(ndr, NDR_ERR_RANGE,
265 : "dom_sid28 allows only up to 5 sub auths [%"PRId8"]",
266 : sid->num_auths);
267 : }
268 :
269 3137818 : old_offset = ndr->offset;
270 3137818 : NDR_CHECK(ndr_push_dom_sid(ndr, ndr_flags, sid));
271 :
272 3137818 : padding = 28 - (ndr->offset - old_offset);
273 :
274 3137818 : if (padding > 0) {
275 2868900 : NDR_CHECK(ndr_push_zero(ndr, padding));
276 : }
277 :
278 3137806 : return NDR_ERR_SUCCESS;
279 : }
280 :
281 : /*
282 : parse a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
283 : */
284 23 : enum ndr_err_code ndr_pull_dom_sid0(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *sid)
285 : {
286 23 : if (!(ndr_flags & NDR_SCALARS)) {
287 0 : return NDR_ERR_SUCCESS;
288 : }
289 :
290 23 : if (ndr->data_size == ndr->offset) {
291 0 : ZERO_STRUCTP(sid);
292 0 : return NDR_ERR_SUCCESS;
293 : }
294 :
295 23 : return ndr_pull_dom_sid(ndr, ndr_flags, sid);
296 : }
297 :
298 : /*
299 : push a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
300 : */
301 16 : enum ndr_err_code ndr_push_dom_sid0(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *sid)
302 : {
303 16 : if (!(ndr_flags & NDR_SCALARS)) {
304 0 : return NDR_ERR_SUCCESS;
305 : }
306 :
307 16 : if (!sid) {
308 0 : return NDR_ERR_SUCCESS;
309 : }
310 :
311 16 : if (all_zero((const uint8_t *)sid, sizeof(struct dom_sid))) {
312 0 : return NDR_ERR_SUCCESS;
313 : }
314 :
315 16 : return ndr_push_dom_sid(ndr, ndr_flags, sid);
316 : }
317 :
318 115238319 : _PUBLIC_ enum ndr_err_code ndr_push_dom_sid(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *r)
319 : {
320 2494579 : uint32_t cntr_sub_auths_0;
321 115238319 : if (ndr_flags & NDR_SCALARS) {
322 115238319 : NDR_CHECK(ndr_push_align(ndr, 4));
323 115238319 : NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, r->sid_rev_num));
324 115238319 : NDR_CHECK(ndr_push_int8(ndr, NDR_SCALARS, r->num_auths));
325 115238319 : NDR_CHECK(ndr_push_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
326 115238319 : if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) {
327 0 : return ndr_push_error(ndr, NDR_ERR_RANGE, "value (%"PRId8") out of range (0 - %zu)", r->num_auths, ARRAY_SIZE(r->sub_auths));
328 : }
329 424627020 : for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
330 309388701 : NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->sub_auths[cntr_sub_auths_0]));
331 : }
332 : }
333 112743740 : return NDR_ERR_SUCCESS;
334 : }
335 :
336 267706859 : _PUBLIC_ enum ndr_err_code ndr_pull_dom_sid(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *r)
337 : {
338 8084203 : uint32_t cntr_sub_auths_0;
339 267706859 : if (ndr_flags & NDR_SCALARS) {
340 267706859 : NDR_CHECK(ndr_pull_align(ndr, 4));
341 267706859 : NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &r->sid_rev_num));
342 267706474 : NDR_CHECK(ndr_pull_int8(ndr, NDR_SCALARS, &r->num_auths));
343 267706424 : if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) {
344 8 : return ndr_pull_error(ndr, NDR_ERR_RANGE, "value (%"PRId8") out of range (0 - %zu)", r->num_auths, ARRAY_SIZE(r->sub_auths));
345 : }
346 267706416 : NDR_CHECK(ndr_pull_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
347 267706416 : ZERO_STRUCT(r->sub_auths);
348 960908687 : for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
349 685118073 : NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->sub_auths[cntr_sub_auths_0]));
350 : }
351 : }
352 259622218 : return NDR_ERR_SUCCESS;
353 : }
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