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
252
253
254
255
256
257
258
259
260
261
262
|
#include <stdlib.h>
#include <string.h>
#include <openssl/md5.h>
#include "triton.h"
#include "events.h"
#include "log.h"
#include "pwdb.h"
#include "radius_p.h"
#include "memdebug.h"
static uint8_t* encrypt_password(const char *passwd, const char *secret, const uint8_t *RA, int *epasswd_len)
{
uint8_t *epasswd;
int i, j, chunk_cnt;
uint8_t b[16], c[16];
MD5_CTX ctx;
chunk_cnt = (strlen(passwd) - 1) / 16 + 1;
epasswd = _malloc(chunk_cnt * 16);
if (!epasswd) {
log_emerg("radius: out of memory\n");
return NULL;
}
memset(epasswd, 0, chunk_cnt * 16);
memcpy(epasswd, passwd, strlen(passwd));
memcpy(c, RA, 16);
for (i = 0; i < chunk_cnt; i++) {
MD5_Init(&ctx);
MD5_Update(&ctx, secret, strlen(secret));
MD5_Update(&ctx, c, 16);
MD5_Final(b, &ctx);
for(j = 0; j < 16; j++)
epasswd[i * 16 + j] ^= b[j];
memcpy(c, epasswd + i * 16, 16);
}
*epasswd_len = chunk_cnt * 16;
return epasswd;
}
static int rad_auth_send(struct rad_req_t *req)
{
int i;
for(i = 0; i < conf_max_try; i++) {
if (rad_req_send(req))
goto out;
rad_req_wait(req, conf_timeout);
if (req->reply) {
if (req->reply->id != req->pack->id) {
rad_packet_free(req->reply);
req->reply = NULL;
} else
break;
}
}
if (!req->reply)
log_ppp_warn("radius:auth: no response\n");
else if (req->reply->code == CODE_ACCESS_ACCEPT) {
rad_proc_attrs(req);
return PWDB_SUCCESS;
}
out:
return PWDB_DENIED;
}
int rad_auth_pap(struct radius_pd_t *rpd, const char *username, va_list args)
{
struct rad_req_t *req;
int r = PWDB_DENIED;
//int id = va_arg(args, int);
const char *passwd = va_arg(args, const char *);
uint8_t *epasswd;
int epasswd_len;
req = rad_req_alloc(rpd, CODE_ACCESS_REQUEST, username);
if (!req)
return PWDB_DENIED;
epasswd = encrypt_password(passwd, conf_auth_secret, req->RA, &epasswd_len);
if (!epasswd)
goto out;
if (rad_packet_add_octets(req->pack, "User-Password", epasswd, epasswd_len)) {
_free(epasswd);
goto out;
}
_free(epasswd);
r = rad_auth_send(req);
if (r == PWDB_SUCCESS) {
struct ev_radius_t ev = {
.ppp = rpd->ppp,
.request = req->pack,
.reply = req->reply,
};
triton_event_fire(EV_RADIUS_ACCESS_ACCEPT, &ev);
}
out:
rad_req_free(req);
return r;
}
int rad_auth_chap_md5(struct radius_pd_t *rpd, const char *username, va_list args)
{
struct rad_req_t *req;
int r = PWDB_DENIED;
uint8_t chap_password[17];
int id = va_arg(args, int);
uint8_t *challenge = va_arg(args, uint8_t *);
int challenge_len = va_arg(args, int);
uint8_t *response = va_arg(args, uint8_t *);
chap_password[0] = id;
memcpy(chap_password + 1, response, 16);
req = rad_req_alloc(rpd, CODE_ACCESS_REQUEST, username);
if (!req)
return PWDB_DENIED;
if (challenge_len == 16)
memcpy(req->RA, challenge, 16);
else {
if (rad_packet_add_octets(req->pack, "CHAP-Challenge", challenge, challenge_len))
goto out;
}
if (rad_packet_add_octets(req->pack, "CHAP-Password", chap_password, 17))
goto out;
r = rad_auth_send(req);
if (r == PWDB_SUCCESS) {
struct ev_radius_t ev = {
.ppp = rpd->ppp,
.request = req->pack,
.reply = req->reply,
};
triton_event_fire(EV_RADIUS_ACCESS_ACCEPT, &ev);
}
out:
rad_req_free(req);
return r;
}
int rad_auth_mschap_v1(struct radius_pd_t *rpd, const char *username, va_list args)
{
int r;
struct rad_req_t *req;
uint8_t response[50];
int id = va_arg(args, int);
const uint8_t *challenge = va_arg(args, const uint8_t *);
int challenge_len = va_arg(args, int);
const uint8_t *lm_response = va_arg(args, const uint8_t *);
const uint8_t *nt_response = va_arg(args, const uint8_t *);
int flags = va_arg(args, int);
req = rad_req_alloc(rpd, CODE_ACCESS_ACCEPT, username);
if (!req)
return PWDB_DENIED;
response[0] = id;
response[1] = flags;
memcpy(response + 2, lm_response, 24);
memcpy(response + 2 + 24, nt_response, 24);
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP-Challenge", challenge, challenge_len))
goto out;
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP-Response", response, sizeof(response)))
goto out;
r = rad_auth_send(req);
if (r == PWDB_SUCCESS) {
struct ev_radius_t ev = {
.ppp = rpd->ppp,
.request = req->pack,
.reply = req->reply,
};
triton_event_fire(EV_RADIUS_ACCESS_ACCEPT, &ev);
}
out:
rad_req_free(req);
return r;
}
int rad_auth_mschap_v2(struct radius_pd_t *rpd, const char *username, va_list args)
{
int r;
struct rad_req_t *req;
struct rad_attr_t *ra;
uint8_t mschap_response[50];
int id = va_arg(args, int);
const uint8_t *challenge = va_arg(args, const uint8_t *);
const uint8_t *peer_challenge = va_arg(args, const uint8_t *);
const uint8_t *reserved = va_arg(args, const uint8_t *);
const uint8_t *response = va_arg(args, const uint8_t *);
int flags = va_arg(args, int);
uint8_t *authenticator = va_arg(args, uint8_t *);
req = rad_req_alloc(rpd, CODE_ACCESS_REQUEST, username);
if (!req)
return PWDB_DENIED;
mschap_response[0] = id;
mschap_response[1] = flags;
memcpy(mschap_response + 2, peer_challenge, 16);
memcpy(mschap_response + 2 + 16, reserved, 8);
memcpy(mschap_response + 2 + 16 + 8, response, 24);
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP-Challenge", challenge, 16))
goto out;
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP2-Response", mschap_response, sizeof(mschap_response)))
goto out;
r = rad_auth_send(req);
if (r == PWDB_SUCCESS) {
ra = rad_packet_find_vendor_attr(req->reply, "Microsoft", "MS-CHAP2-Success");
if (!ra) {
log_error("radius:auth:mschap-v2: 'MS-CHAP-Success' not found in radius response\n");
r = PWDB_DENIED;
} else
memcpy(authenticator, ra->val.octets + 3, 40);
}
if (r == PWDB_SUCCESS) {
struct ev_radius_t ev = {
.ppp = rpd->ppp,
.request = req->pack,
.reply = req->reply,
};
triton_event_fire(EV_RADIUS_ACCESS_ACCEPT, &ev);
}
out:
rad_req_free(req);
return r;
}
|
