summaryrefslogtreecommitdiff
path: root/source4/librpc/ndr/ndr_sec_helper.c
blob: 5a0178bd25bbee897b5b8731060b0821ce5b2b6e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/* 
   Unix SMB/CIFS implementation.

   fast routines for getting the wire size of security objects

   Copyright (C) Andrew Tridgell 2003
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


#include "includes.h"
#include "librpc/gen_ndr/ndr_security.h"
#include "libcli/security/security.h"

/*
  return the wire size of a dom_sid
*/
size_t ndr_size_dom_sid(const struct dom_sid *sid, int flags)
{
	if (!sid) return 0;
	return 8 + 4*sid->num_auths;
}

size_t ndr_size_dom_sid28(const struct dom_sid *sid, int flags)
{
	struct dom_sid zero_sid;

	if (!sid) return 0;

	ZERO_STRUCT(zero_sid);

	if (memcmp(&zero_sid, sid, sizeof(zero_sid)) == 0) {
		return 0;
	}

	return 8 + 4*sid->num_auths;
}

/*
  return the wire size of a security_ace
*/
size_t ndr_size_security_ace(const struct security_ace *ace, int flags)
{
	size_t ret;

	if (!ace) return 0;

	ret = 8 + ndr_size_dom_sid(&ace->trustee, flags);

	switch (ace->type) {
	case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
	case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
	case SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT:
	case SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT:
		ret += 4; /* uint32 bitmap ace->object.object.flags */
		if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
			ret += 16; /* GUID ace->object.object.type.type */
		}
		if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
			ret += 16; /* GUID ace->object.object.inherited_typeinherited_type */
		}
		break;
	default:
		break;
	}

	return ret;
}

/*
  return the wire size of a security_acl
*/
size_t ndr_size_security_acl(const struct security_acl *acl, int flags)
{
	size_t ret;
	int i;
	if (!acl) return 0;
	ret = 8;
	for (i=0;i<acl->num_aces;i++) {
		ret += ndr_size_security_ace(&acl->aces[i], flags);
	}
	return ret;
}

/*
  return the wire size of a security descriptor
*/
size_t ndr_size_security_descriptor(const struct security_descriptor *sd, int flags)
{
	size_t ret;
	if (!sd) return 0;
	
	ret = 20;
	ret += ndr_size_dom_sid(sd->owner_sid, flags);
	ret += ndr_size_dom_sid(sd->group_sid, flags);
	ret += ndr_size_security_acl(sd->dacl, flags);
	ret += ndr_size_security_acl(sd->sacl, flags);
	return ret;
}

/*
  print a dom_sid
*/
void ndr_print_dom_sid(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
{
	ndr->print(ndr, "%-25s: %s", name, dom_sid_string(ndr, sid));
}

void ndr_print_dom_sid2(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
{
	ndr_print_dom_sid(ndr, name, sid);
}

void ndr_print_dom_sid28(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
{
	ndr_print_dom_sid(ndr, name, sid);
}


/*
  parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
*/
enum ndr_err_code ndr_pull_dom_sid2(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
{
	uint32_t num_auths;
	if (!(ndr_flags & NDR_SCALARS)) {
		return NDR_ERR_SUCCESS;
	}
	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &num_auths));
	NDR_CHECK(ndr_pull_dom_sid(ndr, ndr_flags, sid));
	if (sid->num_auths != num_auths) {
		return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, 
				      "Bad array size %u should exceed %u", 
				      num_auths, sid->num_auths);
	}
	return NDR_ERR_SUCCESS;
}

/*
  parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
*/
enum ndr_err_code ndr_push_dom_sid2(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
{
	if (!(ndr_flags & NDR_SCALARS)) {
		return NDR_ERR_SUCCESS;
	}
	NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, sid->num_auths));
	return ndr_push_dom_sid(ndr, ndr_flags, sid);
}

/*
  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
*/
enum ndr_err_code ndr_pull_dom_sid28(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
{
	enum ndr_err_code status;
	struct ndr_pull *subndr;

	if (!(ndr_flags & NDR_SCALARS)) {
		return NDR_ERR_SUCCESS;
	}

	subndr = talloc_zero(ndr, struct ndr_pull);
	NDR_ERR_HAVE_NO_MEMORY(subndr);
	subndr->flags		= ndr->flags;
	subndr->current_mem_ctx	= ndr->current_mem_ctx;

	subndr->data		= ndr->data + ndr->offset;
	subndr->data_size	= 28;
	subndr->offset		= 0;

	NDR_CHECK(ndr_pull_advance(ndr, 28));

	status = ndr_pull_dom_sid(subndr, ndr_flags, sid);
	if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
		/* handle a w2k bug which send random data in the buffer */
		ZERO_STRUCTP(sid);
	} else if (sid->num_auths == 0 && sid->sub_auths) {
		talloc_free(sid->sub_auths);
		sid->sub_auths = NULL;
	}

	return NDR_ERR_SUCCESS;
}

/*
  push a dom_sid28 - this is a dom_sid in a 28 byte fixed buffer
*/
enum ndr_err_code ndr_push_dom_sid28(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
{
	uint32_t old_offset;
	uint32_t padding;

	if (!(ndr_flags & NDR_SCALARS)) {
		return NDR_ERR_SUCCESS;
	}

	if (sid->num_auths > 5) {
		return ndr_push_error(ndr, NDR_ERR_RANGE, 
				      "dom_sid28 allows only upto 5 sub auth [%u]", 
				      sid->num_auths);
	}

	old_offset = ndr->offset;
	NDR_CHECK(ndr_push_dom_sid(ndr, ndr_flags, sid));

	padding = 28 - (ndr->offset - old_offset);

	if (padding > 0) {
		NDR_CHECK(ndr_push_zero(ndr, padding));
	}

	return NDR_ERR_SUCCESS;
}