source: trunk/server/librpc/ndr/ndr_sec_helper.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
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 return the wire size of a security_ace
30*/
31size_t ndr_size_security_ace(const struct security_ace *ace, int flags)
32{
33 size_t ret;
34
35 if (!ace) return 0;
36
37 ret = 8 + ndr_size_dom_sid(&ace->trustee, flags);
38
39 switch (ace->type) {
40 case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
41 case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
42 case SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT:
43 case SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT:
44 ret += 4; /* uint32 bitmap ace->object.object.flags */
45 if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
46 ret += 16; /* GUID ace->object.object.type.type */
47 }
48 if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
49 ret += 16; /* GUID ace->object.object.inherited_typeinherited_type */
50 }
51 break;
52 default:
53 break;
54 }
55
56 return ret;
57}
58
59enum ndr_err_code ndr_pull_security_ace(struct ndr_pull *ndr, int ndr_flags, struct security_ace *r)
60{
61 if (ndr_flags & NDR_SCALARS) {
62 uint32_t start_ofs = ndr->offset;
63 uint32_t size = 0;
64 uint32_t pad = 0;
65 NDR_CHECK(ndr_pull_align(ndr, 4));
66 NDR_CHECK(ndr_pull_security_ace_type(ndr, NDR_SCALARS, &r->type));
67 NDR_CHECK(ndr_pull_security_ace_flags(ndr, NDR_SCALARS, &r->flags));
68 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &r->size));
69 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->access_mask));
70 NDR_CHECK(ndr_pull_set_switch_value(ndr, &r->object, r->type));
71 NDR_CHECK(ndr_pull_security_ace_object_ctr(ndr, NDR_SCALARS, &r->object));
72 NDR_CHECK(ndr_pull_dom_sid(ndr, NDR_SCALARS, &r->trustee));
73 size = ndr->offset - start_ofs;
74 if (r->size < size) {
75 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
76 "ndr_pull_security_ace: r->size %u < size %u",
77 (unsigned)r->size, size);
78 }
79 pad = r->size - size;
80 NDR_PULL_NEED_BYTES(ndr, pad);
81 ndr->offset += pad;
82 }
83 if (ndr_flags & NDR_BUFFERS) {
84 NDR_CHECK(ndr_pull_security_ace_object_ctr(ndr, NDR_BUFFERS, &r->object));
85 }
86 return NDR_ERR_SUCCESS;
87}
88
89/*
90 return the wire size of a security_acl
91*/
92size_t ndr_size_security_acl(const struct security_acl *theacl, int flags)
93{
94 size_t ret;
95 int i;
96 if (!theacl) return 0;
97 ret = 8;
98 for (i=0;i<theacl->num_aces;i++) {
99 ret += ndr_size_security_ace(&theacl->aces[i], flags);
100 }
101 return ret;
102}
103
104/*
105 return the wire size of a security descriptor
106*/
107size_t ndr_size_security_descriptor(const struct security_descriptor *sd, int flags)
108{
109 size_t ret;
110 if (!sd) return 0;
111
112 ret = 20;
113 ret += ndr_size_dom_sid(sd->owner_sid, flags);
114 ret += ndr_size_dom_sid(sd->group_sid, flags);
115 ret += ndr_size_security_acl(sd->dacl, flags);
116 ret += ndr_size_security_acl(sd->sacl, flags);
117 return ret;
118}
119
120/*
121 return the wire size of a dom_sid
122*/
123size_t ndr_size_dom_sid(const struct dom_sid *sid, int flags)
124{
125 if (!sid) return 0;
126 return 8 + 4*sid->num_auths;
127}
128
129size_t ndr_size_dom_sid28(const struct dom_sid *sid, int flags)
130{
131 struct dom_sid zero_sid;
132
133 if (!sid) return 0;
134
135 ZERO_STRUCT(zero_sid);
136
137 if (memcmp(&zero_sid, sid, sizeof(zero_sid)) == 0) {
138 return 0;
139 }
140
141 return 8 + 4*sid->num_auths;
142}
143
144size_t ndr_size_dom_sid0(const struct dom_sid *sid, int flags)
145{
146 return ndr_size_dom_sid28(sid, flags);
147}
148
149/*
150 print a dom_sid
151*/
152void ndr_print_dom_sid(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
153{
154 ndr->print(ndr, "%-25s: %s", name, dom_sid_string(ndr, sid));
155}
156
157void ndr_print_dom_sid2(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
158{
159 ndr_print_dom_sid(ndr, name, sid);
160}
161
162void ndr_print_dom_sid28(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
163{
164 ndr_print_dom_sid(ndr, name, sid);
165}
166
167void ndr_print_dom_sid0(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
168{
169 ndr_print_dom_sid(ndr, name, sid);
170}
171
172
173/*
174 parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
175*/
176enum ndr_err_code ndr_pull_dom_sid2(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
177{
178 uint32_t num_auths;
179 if (!(ndr_flags & NDR_SCALARS)) {
180 return NDR_ERR_SUCCESS;
181 }
182 NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &num_auths));
183 NDR_CHECK(ndr_pull_dom_sid(ndr, ndr_flags, sid));
184 if (sid->num_auths != num_auths) {
185 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
186 "Bad array size %u should exceed %u",
187 num_auths, sid->num_auths);
188 }
189 return NDR_ERR_SUCCESS;
190}
191
192/*
193 parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
194*/
195enum ndr_err_code ndr_push_dom_sid2(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
196{
197 if (!(ndr_flags & NDR_SCALARS)) {
198 return NDR_ERR_SUCCESS;
199 }
200 NDR_CHECK(ndr_push_uint3264(ndr, NDR_SCALARS, sid->num_auths));
201 return ndr_push_dom_sid(ndr, ndr_flags, sid);
202}
203
204/*
205 parse a dom_sid28 - this is a dom_sid in a fixed 28 byte buffer, so we need to ensure there are only upto 5 sub_auth
206*/
207enum ndr_err_code ndr_pull_dom_sid28(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
208{
209 enum ndr_err_code status;
210 struct ndr_pull *subndr;
211
212 if (!(ndr_flags & NDR_SCALARS)) {
213 return NDR_ERR_SUCCESS;
214 }
215
216 subndr = talloc_zero(ndr, struct ndr_pull);
217 NDR_ERR_HAVE_NO_MEMORY(subndr);
218 subndr->flags = ndr->flags;
219 subndr->current_mem_ctx = ndr->current_mem_ctx;
220
221 subndr->data = ndr->data + ndr->offset;
222 subndr->data_size = 28;
223 subndr->offset = 0;
224
225 NDR_CHECK(ndr_pull_advance(ndr, 28));
226
227 status = ndr_pull_dom_sid(subndr, ndr_flags, sid);
228 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
229 /* handle a w2k bug which send random data in the buffer */
230 ZERO_STRUCTP(sid);
231 } else if (sid->num_auths == 0 && sid->sub_auths) {
232 ZERO_STRUCT(sid->sub_auths);
233 }
234
235 return NDR_ERR_SUCCESS;
236}
237
238/*
239 push a dom_sid28 - this is a dom_sid in a 28 byte fixed buffer
240*/
241enum ndr_err_code ndr_push_dom_sid28(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
242{
243 uint32_t old_offset;
244 uint32_t padding;
245
246 if (!(ndr_flags & NDR_SCALARS)) {
247 return NDR_ERR_SUCCESS;
248 }
249
250 if (sid->num_auths > 5) {
251 return ndr_push_error(ndr, NDR_ERR_RANGE,
252 "dom_sid28 allows only upto 5 sub auth [%u]",
253 sid->num_auths);
254 }
255
256 old_offset = ndr->offset;
257 NDR_CHECK(ndr_push_dom_sid(ndr, ndr_flags, sid));
258
259 padding = 28 - (ndr->offset - old_offset);
260
261 if (padding > 0) {
262 NDR_CHECK(ndr_push_zero(ndr, padding));
263 }
264
265 return NDR_ERR_SUCCESS;
266}
267
268/*
269 parse a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
270*/
271enum ndr_err_code ndr_pull_dom_sid0(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
272{
273 if (!(ndr_flags & NDR_SCALARS)) {
274 return NDR_ERR_SUCCESS;
275 }
276
277 if (ndr->data_size == ndr->offset) {
278 ZERO_STRUCTP(sid);
279 return NDR_ERR_SUCCESS;
280 }
281
282 return ndr_pull_dom_sid(ndr, ndr_flags, sid);
283}
284
285/*
286 push a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
287*/
288enum ndr_err_code ndr_push_dom_sid0(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
289{
290 struct dom_sid zero_sid;
291
292 if (!(ndr_flags & NDR_SCALARS)) {
293 return NDR_ERR_SUCCESS;
294 }
295
296 if (!sid) {
297 return NDR_ERR_SUCCESS;
298 }
299
300 ZERO_STRUCT(zero_sid);
301
302 if (memcmp(&zero_sid, sid, sizeof(zero_sid)) == 0) {
303 return NDR_ERR_SUCCESS;
304 }
305
306 return ndr_push_dom_sid(ndr, ndr_flags, sid);
307}
308
309_PUBLIC_ enum ndr_err_code ndr_push_dom_sid(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *r)
310{
311 uint32_t cntr_sub_auths_0;
312 if (ndr_flags & NDR_SCALARS) {
313 NDR_CHECK(ndr_push_align(ndr, 4));
314 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, r->sid_rev_num));
315 NDR_CHECK(ndr_push_int8(ndr, NDR_SCALARS, r->num_auths));
316 NDR_CHECK(ndr_push_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
317 for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
318 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->sub_auths[cntr_sub_auths_0]));
319 }
320 }
321 return NDR_ERR_SUCCESS;
322}
323
324_PUBLIC_ enum ndr_err_code ndr_pull_dom_sid(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *r)
325{
326 uint32_t cntr_sub_auths_0;
327 if (ndr_flags & NDR_SCALARS) {
328 NDR_CHECK(ndr_pull_align(ndr, 4));
329 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &r->sid_rev_num));
330 NDR_CHECK(ndr_pull_int8(ndr, NDR_SCALARS, &r->num_auths));
331 if (r->num_auths < 0 || r->num_auths > 15) {
332 return ndr_pull_error(ndr, NDR_ERR_RANGE, "value out of range");
333 }
334 NDR_CHECK(ndr_pull_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
335 for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
336 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->sub_auths[cntr_sub_auths_0]));
337 }
338 }
339 return NDR_ERR_SUCCESS;
340}
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