libcli/security Provide a common, top level libcli/security/security.h
[samba.git] / libgpo / gpo_sec.c
1 /*
2  *  Unix SMB/CIFS implementation.
3  *  Group Policy Object Support
4  *  Copyright (C) Guenther Deschner 2007
5  *
6  *  This program is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License as published by
8  *  the Free Software Foundation; either version 3 of the License, or
9  *  (at your option) any later version.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include "includes.h"
21 #include "libcli/security/security.h"
22 #include "../libgpo/gpo.h"
23 #if _SAMBA_BUILD_ == 4
24 #include "libgpo/ads_convenience.h"
25 #include "librpc/gen_ndr/security.h"
26 #include "librpc/gen_ndr/ndr_misc.h"
27 #include "../libcli/security/secace.h"
28 #endif
29
30 /****************************************************************
31 ****************************************************************/
32
33 static bool gpo_sd_check_agp_object_guid(const struct security_ace_object *object)
34 {
35         struct GUID ext_right_apg_guid;
36         NTSTATUS status;
37
38         if (!object) {
39                 return false;
40         }
41
42         status = GUID_from_string(ADS_EXTENDED_RIGHT_APPLY_GROUP_POLICY,
43                                   &ext_right_apg_guid);
44         if (!NT_STATUS_IS_OK(status)) {
45                 return false;
46         }
47
48         switch (object->flags) {
49                 case SEC_ACE_OBJECT_TYPE_PRESENT:
50                         if (GUID_equal(&object->type.type,
51                                        &ext_right_apg_guid)) {
52                                 return true;
53                         }
54                 case SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT:
55                         if (GUID_equal(&object->inherited_type.inherited_type,
56                                        &ext_right_apg_guid)) {
57                                 return true;
58                         }
59                 default:
60                         break;
61         }
62
63         return false;
64 }
65
66 /****************************************************************
67 ****************************************************************/
68
69 static bool gpo_sd_check_agp_object(const struct security_ace *ace)
70 {
71         if (!sec_ace_object(ace->type)) {
72                 return false;
73         }
74
75         return gpo_sd_check_agp_object_guid(&ace->object.object);
76 }
77
78 /****************************************************************
79 ****************************************************************/
80
81 static bool gpo_sd_check_agp_access_bits(uint32_t access_mask)
82 {
83         return (access_mask & SEC_ADS_CONTROL_ACCESS);
84 }
85
86 #if 0
87 /****************************************************************
88 ****************************************************************/
89
90 static bool gpo_sd_check_read_access_bits(uint32_t access_mask)
91 {
92         uint32_t read_bits = SEC_RIGHTS_LIST_CONTENTS |
93                            SEC_RIGHTS_READ_ALL_PROP |
94                            SEC_RIGHTS_READ_PERMS;
95
96         return (read_bits == (access_mask & read_bits));
97 }
98 #endif
99
100 /****************************************************************
101 ****************************************************************/
102
103 static NTSTATUS gpo_sd_check_ace_denied_object(const struct security_ace *ace,
104                                                const struct security_token *token)
105 {
106         char *sid_str;
107
108         if (gpo_sd_check_agp_object(ace) &&
109             gpo_sd_check_agp_access_bits(ace->access_mask) &&
110             nt_token_check_sid(&ace->trustee, token)) {
111                 sid_str = dom_sid_string(NULL, &ace->trustee);
112                 DEBUG(10,("gpo_sd_check_ace_denied_object: "
113                         "Access denied as of ace for %s\n",
114                         sid_str));
115                 talloc_free(sid_str);
116                 return NT_STATUS_ACCESS_DENIED;
117         }
118
119         return STATUS_MORE_ENTRIES;
120 }
121
122 /****************************************************************
123 ****************************************************************/
124
125 static NTSTATUS gpo_sd_check_ace_allowed_object(const struct security_ace *ace,
126                                                 const struct security_token *token)
127 {
128         char *sid_str;
129
130         if (gpo_sd_check_agp_object(ace) &&
131             gpo_sd_check_agp_access_bits(ace->access_mask) &&
132             nt_token_check_sid(&ace->trustee, token)) {
133                 sid_str = dom_sid_string(NULL, &ace->trustee);
134                 DEBUG(10,("gpo_sd_check_ace_allowed_object: "
135                         "Access granted as of ace for %s\n",
136                         sid_str));
137                 talloc_free(sid_str);
138
139                 return NT_STATUS_OK;
140         }
141
142         return STATUS_MORE_ENTRIES;
143 }
144
145 /****************************************************************
146 ****************************************************************/
147
148 static NTSTATUS gpo_sd_check_ace(const struct security_ace *ace,
149                                  const struct security_token *token)
150 {
151         switch (ace->type) {
152                 case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
153                         return gpo_sd_check_ace_denied_object(ace, token);
154                 case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
155                         return gpo_sd_check_ace_allowed_object(ace, token);
156                 default:
157                         return STATUS_MORE_ENTRIES;
158         }
159 }
160
161 /****************************************************************
162 ****************************************************************/
163
164 NTSTATUS gpo_apply_security_filtering(const struct GROUP_POLICY_OBJECT *gpo,
165                                       const struct security_token *token)
166 {
167         struct security_descriptor *sd = gpo->security_descriptor;
168         struct security_acl *dacl = NULL;
169         NTSTATUS status = NT_STATUS_ACCESS_DENIED;
170         int i;
171
172         if (!token) {
173                 return NT_STATUS_INVALID_USER_BUFFER;
174         }
175
176         if (!sd) {
177                 return NT_STATUS_INVALID_SECURITY_DESCR;
178         }
179
180         dacl = sd->dacl;
181         if (!dacl) {
182                 return NT_STATUS_INVALID_SECURITY_DESCR;
183         }
184
185         /* check all aces and only return NT_STATUS_OK (== Access granted) or
186          * NT_STATUS_ACCESS_DENIED ( == Access denied) - the default is to
187          * deny access */
188
189         for (i = 0; i < dacl->num_aces; i ++) {
190
191                 status = gpo_sd_check_ace(&dacl->aces[i], token);
192
193                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
194                         return status;
195                 } else if (NT_STATUS_IS_OK(status)) {
196                         return status;
197                 }
198
199                 continue;
200         }
201
202         return NT_STATUS_ACCESS_DENIED;
203 }