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
228
229
230
231
232
233
234
235
236
237
238
|
/*
Unix SMB/Netbios implementation.
Version 1.9.
Groupname handling
Copyright (C) Jeremy Allison 1998.
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
extern DOM_SID global_machine_sid;
/**************************************************************************
Groupname map functionality. The code loads a groupname map file and
(currently) loads it into a linked list. This is slow and memory
hungry, but can be changed into a more efficient storage format
if the demands on it become excessive.
***************************************************************************/
typedef struct groupname_map {
ubi_slNode next;
char *windows_name;
DOM_SID windows_sid;
char *unix_name;
gid_t unix_gid;
} groupname_map_entry;
static ubi_slList groupname_map_list;
/**************************************************************************
Delete all the entries in the groupname map list.
***************************************************************************/
static void delete_groupname_map_list(void)
{
groupname_map_entry *gmep;
while((gmep = (groupname_map_entry *)ubi_slRemHead( &groupname_map_list )) != NULL) {
if(gmep->windows_name)
free(gmep->windows_name);
if(gmep->unix_name)
free(gmep->unix_name);
free((char *)gmep);
}
}
/**************************************************************************
Load a groupname map file. Sets last accessed timestamp.
***************************************************************************/
void load_groupname_map(void)
{
static time_t groupmap_file_last_modified = (time_t)0;
static BOOL initialized = False;
char *groupname_map_file = lp_groupname_map();
SMB_STRUCT_STAT st;
FILE *fp;
char *s;
pstring buf;
groupname_map_entry *new_ep;
if(!initialized) {
ubi_slInitList( &groupname_map_list );
initialized = True;
}
if (!*groupname_map_file)
return;
if(stat(groupname_map_file, &st) != 0) {
DEBUG(0, ("load_groupname_map: Unable to stat file %s. Error was %s\n",
groupname_map_file, strerror(errno) ));
return;
}
/*
* Check if file has changed.
*/
if( st.st_mtime <= groupmap_file_last_modified)
return;
groupmap_file_last_modified = st.st_mtime;
/*
* Load the file.
*/
fp = fopen(groupname_map_file,"r");
if (!fp) {
DEBUG(0,("load_groupname_map: can't open groupname map %s. Error was %s\n",
groupname_map_file, strerror(errno)));
return;
}
/*
* Throw away any previous list.
*/
delete_groupname_map_list();
DEBUG(4,("load_groupname_map: Scanning groupname map %s\n",groupname_map_file));
while((s=fgets_slash(buf,sizeof(buf),fp))!=NULL) {
pstring unixname;
pstring windows_name;
struct group *gptr;
DOM_SID tmp_sid;
DEBUG(10,("load_groupname_map: Read line |%s|\n", s));
if (!*s || strchr("#;",*s))
continue;
if(!next_token(&s,unixname, "\t\n\r=", sizeof(unixname)))
continue;
if(!next_token(&s,windows_name, "\t\n\r=", sizeof(windows_name)))
continue;
trim_string(unixname, " ", " ");
trim_string(windows_name, " ", " ");
if (!*windows_name)
continue;
if(!*unixname)
continue;
DEBUG(5,("load_groupname_map: unixname = %s, windowsname = %s.\n",
unixname, windows_name));
/*
* Attempt to get the unix gid_t for this name.
*/
if((gptr = (struct group *)getgrnam(unixname)) == NULL) {
DEBUG(0,("load_groupname_map: getgrnam for group %s failed.\
Error was %s.\n", unixname, strerror(errno) ));
continue;
}
/*
* Now map to an NT SID.
*/
if(!lookup_wellknown_sid_from_name(windows_name, &tmp_sid)) {
/*
* It's not a well known name, convert the UNIX gid_t
* to a rid within this domain SID.
*/
tmp_sid = global_machine_sid;
tmp_sid.sub_auths[tmp_sid.num_auths++] =
pdb_gid_to_group_rid((gid_t)gptr->gr_gid);
}
/*
* Create the list entry and add it onto the list.
*/
if((new_ep = (groupname_map_entry *)malloc( sizeof(groupname_map_entry) ))== NULL) {
DEBUG(0,("load_groupname_map: malloc fail for groupname_map_entry.\n"));
fclose(fp);
return;
}
new_ep->unix_gid = gptr->gr_gid;
new_ep->windows_sid = tmp_sid;
new_ep->windows_name = strdup( windows_name );
new_ep->unix_name = strdup( unixname );
if(new_ep->windows_name == NULL || new_ep->unix_name == NULL) {
DEBUG(0,("load_groupname_map: malloc fail for names in groupname_map_entry.\n"));
fclose(fp);
if(new_ep->windows_name != NULL)
free(new_ep->windows_name);
if(new_ep->unix_name != NULL)
free(new_ep->unix_name);
free((char *)new_ep);
return;
}
memset((char *)&new_ep->next, '\0', sizeof(new_ep->next) );
ubi_slAddHead( &groupname_map_list, (ubi_slNode *)new_ep);
}
DEBUG(10,("load_groupname_map: Added %ld entries to groupname map.\n",
ubi_slCount(&groupname_map_list)));
fclose(fp);
}
/***********************************************************
Lookup a SID entry by gid_t.
************************************************************/
void map_gid_to_sid( gid_t gid, DOM_SID *psid)
{
groupname_map_entry *gmep;
/*
* Initialize and load if not already loaded.
*/
load_groupname_map();
for( gmep = (groupname_map_entry *)ubi_slFirst( &groupname_map_list);
gmep; gmep = (groupname_map_entry *)ubi_slNext( gmep )) {
if( gmep->unix_gid == gid) {
*psid = gmep->windows_sid;
DEBUG(7,("map_gid_to_sid: Mapping unix group %s to windows group %s.\n",
gmep->unix_name, gmep->windows_name ));
return;
}
}
/*
* If there's no map, convert the UNIX gid_t
* to a rid within this domain SID.
*/
*psid = global_machine_sid;
psid->sub_auths[psid->num_auths++] = pdb_gid_to_group_rid(gid);
return;
}
|
