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
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/* This file is part of the Project Athena Zephyr Notification System.
* It contains functions for dealing with acl's.
*
* Created by: John T. Kohl
*
* $Id$
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <zephyr/mit-copyright.h>
#include "zserver.h"
#if !defined (lint) && !defined (SABER)
static const char rcsid_access_c[] =
"$Id$";
#endif
/*
*
* External routines:
*
* int access_check(sender, who, acl, accesstype)
* char *sender;
* struct sockaddr_in *who;
* Acl *acl;
* Access accesstype;
*
* int opstaff_check(sender)
* char *sender;
*
* void access_init();
*
* void access_reinit();
*/
/*
* Each restricted class has four ACL's associated with it,
* governing subscriptions, transmission, and instance restrictions.
* This module provides the 'glue' between the standard Athena ACL
* routines and the support needed by the Zephyr server.
*/
/*
* Our private types for the acl_types field in the Acl structure.
* -TYT 8/14/90
*/
#define ACL_XMT 1
#define ACL_SUB 2
#define ACL_IWS 4
#define ACL_IUI 8
static void check_acl(Acl *acl);
static void check_acl_type(Acl *acl, Access accesstype, int typeflag);
static void access_setup(int first);
/*
* check access. return 1 if ok, 0 if not ok.
*/
int
access_check(char *sender,
struct sockaddr_in *who,
Acl *acl,
Access accesstype)
{
char buf[1024]; /* holds the real acl name */
char *prefix;
int flag;
int retval;
switch (accesstype) {
case TRANSMIT:
prefix = "xmt";
flag = ACL_XMT;
break;
case SUBSCRIBE:
prefix = "sub";
flag = ACL_SUB;
break;
case INSTWILD:
prefix = "iws";
flag = ACL_IWS;
break;
case INSTUID:
prefix = "iui";
flag = ACL_IUI;
break;
default:
syslog(LOG_ERR, "unknown access type %d", (int) accesstype);
return 0;
}
if (!(acl->acl_types & flag)) /* no acl ==> no restriction */
return 1;
snprintf(buf, sizeof buf, "%s/%s-%s.acl", acl_dir, prefix, acl->acl_filename);
/*
* If we can't load it (because it probably doesn't exist),
* we deny access.
*/
retval = acl_load(buf);
if (retval < 0) {
syslog(LOG_DEBUG, "Error in acl_load of %s for %s",
buf, sender ? sender : "unauth client");
return 0;
}
return acl_check(buf, sender, who);
}
int
opstaff_check(char *sender)
{
char buf[1024]; /* holds the real acl name */
int retval;
snprintf(buf, sizeof buf, "%s/opstaff.acl", acl_dir);
/*
* If we can't load it (because it probably doesn't exist),
* we deny access.
*/
retval = acl_load(buf);
if (retval < 0) {
syslog(LOG_DEBUG, "Error in acl_load of %s for %s",
buf, sender ? sender : "unauth client");
return 0;
}
return acl_check(buf, sender, NULL);
}
static void
check_acl(Acl *acl)
{
acl->acl_types = 0;
check_acl_type(acl, TRANSMIT, ACL_XMT);
check_acl_type(acl, SUBSCRIBE, ACL_SUB);
check_acl_type(acl, INSTWILD, ACL_IWS);
check_acl_type(acl, INSTUID, ACL_IUI);
}
static void
check_acl_type(Acl *acl,
Access accesstype,
int typeflag)
{
char buf[1024]; /* holds the real acl name */
char *prefix;
switch (accesstype) {
case TRANSMIT:
prefix = "xmt";
break;
case SUBSCRIBE:
prefix = "sub";
break;
case INSTWILD:
prefix = "iws";
break;
case INSTUID:
prefix = "iui";
break;
default:
syslog(LOG_ERR, "unknown access type %d", (int) accesstype);
return;
}
snprintf(buf, sizeof buf, "%s/%s-%s.acl", acl_dir, prefix, acl->acl_filename);
if (!access(buf, F_OK))
acl->acl_types |= typeflag;
}
/*
* Re-init code written by TYT, 8/14/90.
*
* General plan of action; we reread the registry list, and add any
* new restricted classes. If any restricted classes disappear (this
* should be rarely) the Acl structure is not deallocated; rather,
* the acl_types field will be left at zero, since there will be no
* acl files for the (non-)restricted class.
*/
static void
access_setup(int first)
{
char buf[1024];
char class_name[512]; /* assume class names <= 511 bytes */
FILE *registry;
Acl *acl;
int len;
char *colon_idx;
Code_t retval = 0;
snprintf(buf, sizeof buf, "%s/%s", acl_dir, ZEPHYR_CLASS_REGISTRY);
registry = fopen(buf, "r");
if (!registry) {
syslog(LOG_ERR, "no registry available, all classes are free");
return;
}
while (fgets(class_name, 512, registry)) {
colon_idx = strchr(class_name, ':');
if (colon_idx != NULL)
*colon_idx = '\0';
else if ((len = strlen(class_name)) != 0)
class_name[len - 1] = '\0';
acl = 0;
if (!first) {
String *z;
z = make_string(class_name,1);
acl = class_get_acl(z);
free_string(z);
}
if (!acl) {
acl = (Acl *) malloc(sizeof(Acl));
if (!acl) {
syslog(LOG_ERR, "no mem acl alloc");
abort();
}
acl->acl_filename = strsave(class_name);
check_acl(acl);
if (!first) {
/* Try to restrict already existing class */
retval = class_restrict(class_name, acl);
if (retval == ZSRV_NOCLASS)
retval = class_setup_restricted(class_name, acl);
} else {
retval = class_setup_restricted(class_name, acl);
}
}
if (retval) {
syslog(LOG_ERR, "can't restrict %s: %s",
class_name, error_message(retval));
continue;
}
zdbug((LOG_DEBUG, "restricted %s", class_name));
}
fclose(registry);
}
void
access_init(void)
{
access_setup(1);
}
void
access_reinit(void)
{
acl_cache_reset();
access_setup(0);
}
|
