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
|
/*
* PPP PAP Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993-94, Internet Initiative Japan, Inc.
* All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: pap.c,v 1.21 1998/02/19 02:10:13 brian Exp $
*
* TODO:
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef __OpenBSD__
#include <util.h>
#else
#include <libutil.h>
#endif
#include <utmp.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "lcp.h"
#include "pap.h"
#include "loadalias.h"
#include "vars.h"
#include "hdlc.h"
#include "lcpproto.h"
#include "phase.h"
#include "auth.h"
#include "id.h"
static const char *papcodes[] = { "???", "REQUEST", "ACK", "NAK" };
static void
SendPapChallenge(int papid)
{
struct fsmheader lh;
struct mbuf *bp;
u_char *cp;
int namelen, keylen, plen;
namelen = strlen(VarAuthName);
keylen = strlen(VarAuthKey);
plen = namelen + keylen + 2;
LogPrintf(LogDEBUG, "SendPapChallenge: namelen = %d, keylen = %d\n",
namelen, keylen);
if (LogIsKept(LogDEBUG))
LogPrintf(LogPHASE, "PAP: %s (%s)\n", VarAuthName, VarAuthKey);
else
LogPrintf(LogPHASE, "PAP: %s\n", VarAuthName);
lh.code = PAP_REQUEST;
lh.id = papid;
lh.length = htons(plen + sizeof(struct fsmheader));
bp = mballoc(plen + sizeof(struct fsmheader), MB_FSM);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
cp = MBUF_CTOP(bp) + sizeof(struct fsmheader);
*cp++ = namelen;
memcpy(cp, VarAuthName, namelen);
cp += namelen;
*cp++ = keylen;
memcpy(cp, VarAuthKey, keylen);
HdlcOutput(PRI_LINK, PROTO_PAP, bp);
}
struct authinfo AuthPapInfo = {
SendPapChallenge,
};
static void
SendPapCode(int id, int code, const char *message)
{
struct fsmheader lh;
struct mbuf *bp;
u_char *cp;
int plen, mlen;
lh.code = code;
lh.id = id;
mlen = strlen(message);
plen = mlen + 1;
lh.length = htons(plen + sizeof(struct fsmheader));
bp = mballoc(plen + sizeof(struct fsmheader), MB_FSM);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
cp = MBUF_CTOP(bp) + sizeof(struct fsmheader);
*cp++ = mlen;
memcpy(cp, message, mlen);
LogPrintf(LogPHASE, "PapOutput: %s\n", papcodes[code]);
HdlcOutput(PRI_LINK, PROTO_PAP, bp);
}
/*
* Validate given username and passwrd against with secret table
*/
static int
PapValidate(u_char * name, u_char * key)
{
int nlen, klen;
nlen = *name++;
klen = *key;
*key++ = 0;
key[klen] = 0;
LogPrintf(LogDEBUG, "PapValidate: name %s (%d), key %s (%d)\n",
name, nlen, key, klen);
#ifndef NOPASSWDAUTH
if (Enabled(ConfPasswdAuth)) {
struct passwd *pwd;
int result;
LogPrintf(LogLCP, "Using PasswdAuth\n");
result = (pwd = getpwnam(name)) &&
!strcmp(crypt(key, pwd->pw_passwd), pwd->pw_passwd);
endpwent();
return result;
}
#endif
return (AuthValidate(SECRETFILE, name, key));
}
void
PapInput(struct mbuf * bp)
{
int len = plength(bp);
struct fsmheader *php;
struct lcpstate *lcp = &LcpInfo;
u_char *cp;
if (len >= sizeof(struct fsmheader)) {
php = (struct fsmheader *) MBUF_CTOP(bp);
if (len >= ntohs(php->length)) {
if (php->code < PAP_REQUEST || php->code > PAP_NAK)
php->code = 0;
LogPrintf(LogPHASE, "PapInput: %s\n", papcodes[php->code]);
switch (php->code) {
case PAP_REQUEST:
cp = (u_char *) (php + 1);
if (PapValidate(cp, cp + *cp + 1)) {
SendPapCode(php->id, PAP_ACK, "Greetings!!");
lcp->auth_ineed = 0;
if (lcp->auth_iwait == 0) {
if ((mode & MODE_DIRECT) && isatty(modem) && Enabled(ConfUtmp)) {
if (Utmp)
LogPrintf(LogERROR, "Oops, already logged in on %s\n",
VarBaseDevice);
else {
struct utmp ut;
memset(&ut, 0, sizeof ut);
time(&ut.ut_time);
strncpy(ut.ut_name, cp+1, sizeof ut.ut_name);
strncpy(ut.ut_line, VarBaseDevice, sizeof ut.ut_line - 1);
ID0login(&ut);
Utmp = 1;
}
}
NewPhase(PHASE_NETWORK);
}
} else {
SendPapCode(php->id, PAP_NAK, "Login incorrect");
reconnect(RECON_FALSE);
LcpClose();
}
break;
case PAP_ACK:
StopAuthTimer(&AuthPapInfo);
cp = (u_char *) (php + 1);
len = *cp++;
cp[len] = 0;
LogPrintf(LogPHASE, "Received PAP_ACK (%s)\n", cp);
if (lcp->auth_iwait == PROTO_PAP) {
lcp->auth_iwait = 0;
if (lcp->auth_ineed == 0)
NewPhase(PHASE_NETWORK);
}
break;
case PAP_NAK:
StopAuthTimer(&AuthPapInfo);
cp = (u_char *) (php + 1);
len = *cp++;
cp[len] = 0;
LogPrintf(LogPHASE, "Received PAP_NAK (%s)\n", cp);
reconnect(RECON_FALSE);
LcpClose();
break;
}
}
}
pfree(bp);
}
|
