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
|
/*
* security service wrapper to support pluggable security models
*/
#include <net-snmp/net-snmp-config.h>
#include <stdio.h>
#include <ctype.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif
#include <net-snmp/types.h>
#include <net-snmp/output_api.h>
#include <net-snmp/config_api.h>
#include <net-snmp/utilities.h>
#include <net-snmp/library/snmp_api.h>
#include <net-snmp/library/snmp_enum.h>
#include <net-snmp/library/callback.h>
#include <net-snmp/library/snmp_secmod.h>
#include <net-snmp/library/snmpusm.h>
static struct snmp_secmod_list *registered_services = NULL;
static SNMPCallback set_default_secmod;
void
init_secmod(void)
{
snmp_register_callback(SNMP_CALLBACK_LIBRARY,
SNMP_CALLBACK_SESSION_INIT, set_default_secmod,
NULL);
netsnmp_ds_register_config(ASN_OCTET_STR, "snmp", "defSecurityModel",
NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_SECMODEL);
/*
* this file is generated by configure for all the stuff we're using
*/
#include "snmpsm_init.h"
}
int
register_sec_mod(int secmod, const char *modname,
struct snmp_secmod_def *newdef)
{
int result;
struct snmp_secmod_list *sptr;
char *othername;
for (sptr = registered_services; sptr; sptr = sptr->next) {
if (sptr->securityModel == secmod) {
return SNMPERR_GENERR;
}
}
sptr = SNMP_MALLOC_STRUCT(snmp_secmod_list);
if (sptr == NULL)
return SNMPERR_MALLOC;
sptr->secDef = newdef;
sptr->securityModel = secmod;
sptr->next = registered_services;
registered_services = sptr;
if ((result =
se_add_pair_to_slist("snmp_secmods", strdup(modname), secmod))
!= SE_OK) {
switch (result) {
case SE_NOMEM:
snmp_log(LOG_CRIT, "snmp_secmod: no memory\n");
break;
case SE_ALREADY_THERE:
othername = se_find_label_in_slist("snmp_secmods", secmod);
if (strcmp(othername, modname) != 0) {
snmp_log(LOG_ERR,
"snmp_secmod: two security modules %s and %s registered with the same security number\n",
modname, othername);
}
break;
default:
snmp_log(LOG_ERR,
"snmp_secmod: unknown error trying to register a new security module\n");
break;
}
return SNMPERR_GENERR;
}
return SNMPERR_SUCCESS;
}
int
unregister_sec_mod(int secmod)
{
struct snmp_secmod_list *sptr, *lptr;
for (sptr = registered_services, lptr = NULL; sptr;
lptr = sptr, sptr = sptr->next) {
if (sptr->securityModel == secmod) {
if ( lptr )
lptr->next = sptr->next;
else
registered_services = sptr->next;
SNMP_FREE(sptr->secDef);
SNMP_FREE(sptr);
return SNMPERR_SUCCESS;
}
}
/*
* not registered
*/
return SNMPERR_GENERR;
}
void
clear_sec_mod(void)
{
struct snmp_secmod_list *tmp = registered_services, *next = NULL;
while (tmp != NULL) {
next = tmp->next;
SNMP_FREE(tmp->secDef);
SNMP_FREE(tmp);
tmp = next;
}
registered_services = NULL;
}
struct snmp_secmod_def *
find_sec_mod(int secmod)
{
struct snmp_secmod_list *sptr;
for (sptr = registered_services; sptr; sptr = sptr->next) {
if (sptr->securityModel == secmod) {
return sptr->secDef;
}
}
/*
* not registered
*/
return NULL;
}
static int
set_default_secmod(int major, int minor, void *serverarg, void *clientarg)
{
netsnmp_session *sess = (netsnmp_session *) serverarg;
char *cptr;
int model;
if (!sess)
return SNMPERR_GENERR;
if (sess->securityModel == SNMP_DEFAULT_SECMODEL) {
if ((cptr = netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_SECMODEL)) != NULL) {
if ((model = se_find_value_in_slist("snmp_secmods", cptr))
!= SE_DNE) {
sess->securityModel = model;
} else {
snmp_log(LOG_ERR,
"unknown security model name: %s. Forcing USM instead.\n",
cptr);
sess->securityModel = USM_SEC_MODEL_NUMBER;
return SNMPERR_GENERR;
}
} else {
sess->securityModel = USM_SEC_MODEL_NUMBER;
}
}
return SNMPERR_SUCCESS;
}
|
