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
|
#include <stdlib.h>
#include <string.h>
#include <openssl/md5.h>
#include "log.h"
#include "pwdb.h"
#include "radius.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);
rad_auth_send(req);
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);
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_REQUEST, 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);
out:
rad_req_free(req);
return r;
}
int rad_auth_mschap_v2(struct radius_pd_t *rpd, const char *username, va_list args)
{
/*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 *response = va_arg(args, const uint8_t *);
int flags = va_arg(args, int);
uint8_t *authenticator = va_arg(args, uint8_t *);*/
return PWDB_NO_IMPL;
}
|
