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
|
/*
* Samba Unix/Linux SMB client library
*
* Copyright (C) Gregor Beck 2011
*
* 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/>.
*/
/**
* @brief Notify smbd about idmap changes
* @file msg_idmap.c
* @author Gregor Beck <gb@sernet.de>
* @date Feb 2011
*
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "memcache.h"
#include "globals.h"
#include "../libcli/security/dom_sid.h"
#include "../librpc/gen_ndr/messaging.h"
#include "../librpc/gen_ndr/ndr_security.h"
#include "idmap_cache.h"
#include "passdb/lookup_sid.h"
struct id {
union {
uid_t uid;
gid_t gid;
struct dom_sid sid;
} id;
enum {UID, GID, SID} type;
};
static bool parse_id(const char* str, struct id* id)
{
struct dom_sid sid;
unsigned long ul;
char c, trash;
if (sscanf(str, "%cID %lu%c", &c, &ul, &trash) == 2) {
switch(c) {
case 'G':
id->id.gid = ul;
id->type = GID;
return true;
case 'U':
id->id.uid = ul;
id->type = UID;
return true;
default:
break;
}
} else if (string_to_sid(&sid, str)) {
id->id.sid = sid;
id->type = SID;
return true;
}
return false;
}
static bool uid_in_use(const struct user_struct* user, uid_t uid)
{
while (user) {
if (user->session_info && (user->session_info->utok.uid == uid)) {
return true;
}
user = user->next;
}
return false;
}
static bool gid_in_use(const struct user_struct* user, gid_t gid)
{
while (user) {
if (user->session_info != NULL) {
int i;
struct security_unix_token utok = user->session_info->utok;
if (utok.gid == gid) {
return true;
}
for(i=0; i<utok.ngroups; i++) {
if (utok.groups[i] == gid) {
return true;
}
}
}
user = user->next;
}
return false;
}
static bool sid_in_use(const struct user_struct* user, const struct dom_sid* psid)
{
uid_t uid;
gid_t gid;
if (sid_to_gid(psid, &gid)) {
return gid_in_use(user, gid);
} else if (sid_to_uid(psid, &uid)) {
return uid_in_use(user, uid);
}
return false;
}
static bool id_in_use(const struct user_struct* user, const struct id* id)
{
switch(id->type) {
case UID:
return uid_in_use(user, id->id.uid);
case GID:
return gid_in_use(user, id->id.gid);
case SID:
return sid_in_use(user, &id->id.sid);
default:
break;
}
return false;
}
static void delete_from_cache(const struct id* id)
{
switch(id->type) {
case UID:
delete_uid_cache(id->id.uid);
idmap_cache_del_uid(id->id.uid);
break;
case GID:
delete_gid_cache(id->id.gid);
idmap_cache_del_gid(id->id.gid);
break;
case SID:
delete_sid_cache(&id->id.sid);
idmap_cache_del_sid(&id->id.sid);
break;
default:
break;
}
}
static void message_idmap_flush(struct messaging_context *msg_ctx,
void* private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB* data)
{
const char* msg = data ? (const char*)data->data : NULL;
if ((msg == NULL) || (msg[0] == '\0')) {
flush_gid_cache();
flush_uid_cache();
} else if (strncmp(msg, "GID", 3)) {
flush_gid_cache();
} else if (strncmp(msg, "UID", 3)) {
flush_uid_cache();
} else {
DEBUG(0, ("Invalid argument: %s\n", msg));
}
}
static void message_idmap_delete(struct messaging_context *msg_ctx,
void* private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB* data)
{
const char* msg = (data && data->data) ? (const char*)data->data : "<NULL>";
bool do_kill = (msg_type == MSG_IDMAP_KILL);
struct user_struct* validated_users = smbd_server_conn->smb1.sessions.validated_users;
struct id id;
if (!parse_id(msg, &id)) {
DEBUG(0, ("Invalid ?ID: %s\n", msg));
return;
}
if( do_kill && id_in_use(validated_users, &id) ) {
exit_server_cleanly(msg);
} else {
delete_from_cache(&id);
}
}
void msg_idmap_register_msgs(struct messaging_context *ctx)
{
messaging_register(ctx, NULL, MSG_IDMAP_FLUSH, message_idmap_flush);
messaging_register(ctx, NULL, MSG_IDMAP_DELETE, message_idmap_delete);
messaging_register(ctx, NULL, MSG_IDMAP_KILL, message_idmap_delete);
}
|
