summaryrefslogtreecommitdiffstats
path: root/usr.sbin/ppp/pap.c
blob: 1459e5130a811f4a131727015b578eeb1bfbf281 (plain)
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
/*
 *			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 1.32 1999/02/20 01:12:45 brian Exp $
 *
 *	TODO:
 */
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/un.h>

#include <stdlib.h>
#include <string.h>
#include <termios.h>

#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "lcp.h"
#include "auth.h"
#include "pap.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcpproto.h"
#include "async.h"
#include "throughput.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#include "iplist.h"
#include "slcompress.h"
#include "ipcp.h"
#include "filter.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "bundle.h"
#include "chat.h"
#include "chap.h"
#include "cbcp.h"
#include "datalink.h"

static const char *papcodes[] = { "???", "REQUEST", "SUCCESS", "FAILURE" };
#define MAXPAPCODE (sizeof papcodes / sizeof papcodes[0] - 1)

static void
pap_Req(struct authinfo *authp)
{
  struct bundle *bundle = authp->physical->dl->bundle;
  struct fsmheader lh;
  struct mbuf *bp;
  u_char *cp;
  int namelen, keylen, plen;

  namelen = strlen(bundle->cfg.auth.name);
  keylen = strlen(bundle->cfg.auth.key);
  plen = namelen + keylen + 2;
  log_Printf(LogDEBUG, "pap_Req: namelen = %d, keylen = %d\n", namelen, keylen);
  log_Printf(LogPHASE, "Pap Output: %s ********\n", bundle->cfg.auth.name);
  if (*bundle->cfg.auth.name == '\0')
    log_Printf(LogWARN, "Sending empty PAP authname!\n");
  lh.code = PAP_REQUEST;
  lh.id = authp->id;
  lh.length = htons(plen + sizeof(struct fsmheader));
  bp = mbuf_Alloc(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, bundle->cfg.auth.name, namelen);
  cp += namelen;
  *cp++ = keylen;
  memcpy(cp, bundle->cfg.auth.key, keylen);

  hdlc_Output(&authp->physical->link, PRI_LINK, PROTO_PAP, bp);
}

static void
SendPapCode(struct authinfo *authp, int code, const char *message)
{
  struct fsmheader lh;
  struct mbuf *bp;
  u_char *cp;
  int plen, mlen;

  lh.code = code;
  lh.id = authp->id;
  mlen = strlen(message);
  plen = mlen + 1;
  lh.length = htons(plen + sizeof(struct fsmheader));
  bp = mbuf_Alloc(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);
  log_Printf(LogPHASE, "Pap Output: %s\n", papcodes[code]);

  hdlc_Output(&authp->physical->link, PRI_LINK, PROTO_PAP, bp);
}

static void
pap_Success(struct authinfo *authp)
{
  datalink_GotAuthname(authp->physical->dl, authp->in.name);
  SendPapCode(authp, PAP_ACK, "Greetings!!");
  authp->physical->link.lcp.auth_ineed = 0;
  if (Enabled(authp->physical->dl->bundle, OPT_UTMP))
    physical_Login(authp->physical, authp->in.name);

  if (authp->physical->link.lcp.auth_iwait == 0)
    /*
     * Either I didn't need to authenticate, or I've already been
     * told that I got the answer right.
     */
    datalink_AuthOk(authp->physical->dl);
}

static void
pap_Failure(struct authinfo *authp)
{
  SendPapCode(authp, PAP_NAK, "Login incorrect");
  datalink_AuthNotOk(authp->physical->dl);
}

void
pap_Init(struct authinfo *pap, struct physical *p)
{
  auth_Init(pap, p, pap_Req, pap_Success, pap_Failure);
}

void
pap_Input(struct physical *p, struct mbuf *bp)
{
  struct authinfo *authp = &p->dl->pap;
  u_char nlen, klen, *key;

  if ((bp = auth_ReadHeader(authp, bp)) == NULL &&
      ntohs(authp->in.hdr.length) == 0) {
    log_Printf(LogWARN, "Pap Input: Truncated header !\n");
    return;
  }

  if (authp->in.hdr.code == 0 || authp->in.hdr.code > MAXPAPCODE) {
    log_Printf(LogPHASE, "Pap Input: %d: Bad PAP code !\n", authp->in.hdr.code);
    mbuf_Free(bp);
    return;
  }

  if (authp->in.hdr.code != PAP_REQUEST && authp->id != authp->in.hdr.id &&
      Enabled(p->dl->bundle, OPT_IDCHECK)) {
    /* Wrong conversation dude ! */
    log_Printf(LogPHASE, "Pap Input: %s dropped (got id %d, not %d)\n",
               papcodes[authp->in.hdr.code], authp->in.hdr.id, authp->id);
    mbuf_Free(bp);
    return;
  }
  authp->id = authp->in.hdr.id;		/* We respond with this id */

  if (bp) {
    bp = mbuf_Read(bp, &nlen, 1);
    bp = auth_ReadName(authp, bp, nlen);
  }

  log_Printf(LogPHASE, "Pap Input: %s (%s)\n",
             papcodes[authp->in.hdr.code], authp->in.name);

  switch (authp->in.hdr.code) {
    case PAP_REQUEST:
      if (bp == NULL) {
        log_Printf(LogPHASE, "Pap Input: No key given !\n");
        break;
      }
      bp = mbuf_Read(bp, &klen, 1);
      if (mbuf_Length(bp) < klen) {
        log_Printf(LogERROR, "Pap Input: Truncated key !\n");
        break;
      }
      if ((key = malloc(klen+1)) == NULL) {
        log_Printf(LogERROR, "Pap Input: Out of memory !\n");
        break;
      }
      bp = mbuf_Read(bp, key, klen);
      key[klen] = '\0';

#ifndef NORADIUS
      if (*p->dl->bundle->radius.cfg.file)
        radius_Authenticate(&p->dl->bundle->radius, authp, authp->in.name,
                            key, NULL);
      else
#endif
      if (auth_Validate(p->dl->bundle, authp->in.name, key, p))
        pap_Success(authp);
      else
        pap_Failure(authp);

      free(key);
      break;

    case PAP_ACK:
      auth_StopTimer(authp);
      if (p->link.lcp.auth_iwait == PROTO_PAP) {
        p->link.lcp.auth_iwait = 0;
        if (p->link.lcp.auth_ineed == 0)
          /*
           * We've succeeded in our ``login''
           * If we're not expecting  the peer to authenticate (or he already
           * has), proceed to network phase.
           */
          datalink_AuthOk(p->dl);
      }
      break;

    case PAP_NAK:
      auth_StopTimer(authp);
      datalink_AuthNotOk(p->dl);
      break;
  }

  mbuf_Free(bp);
}
OpenPOWER on IntegriCloud